Attachment 358820 Details for Bug 192991 – Patch for committing

[patch] Patch for committing

bug-192991-20190110124529.patch (text/plain), 317.24 KB, created by Myles C. Maxfield on 2019-01-10 12:45:30 PST

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Creator: Myles C. Maxfield

Created: 2019-01-10 12:45:30 PST

Size: 317.24 KB

patch

obsolete

>Subversion Revision: 239586
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index b83270c0e2c667c9357e445c97bf0bb81c2f15dc..0b54ee57e214c34aef53ef97dbec0c6650579164 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,458 @@
>+2019-01-09  Myles C. Maxfield  <mmaxfield@apple.com>
>+
>+        [WHLSL] Implement parser AST nodes
>+        https://bugs.webkit.org/show_bug.cgi?id=192991
>+
>+        Reviewed by Alex Christensen.
>+
>+        This patch creates all the AST nodes which will be the result of running the parser.
>+        This patch used to be a part of the "create a WHLSL parser" patch but I split them
>+        out in order to aid reviewing.
>+
>+        The classes were mechanically created to match the result of the parser. There are
>+        nodes for things like ForLoops, LogicalNotExpressions, DereferenceExpressions,
>+        StructureDefinitions, and things like that. The classes don't actually have any logic
>+        in them - they are currently just containers to hold the structure of the parsed
>+        program. Some of these nodes (like constexprs) are just Variants of the various things
>+        they can in the form of.
>+
>+        No new tests because the parser doesn't exist to create the new AST nodes yet.
>+
>+        * Modules/webgpu/WHLSL/AST/WHLSLArrayReferenceType.h: Added.
>+        (WebCore::WHLSL::AST::ArrayReferenceType::ArrayReferenceType):
>+        * Modules/webgpu/WHLSL/AST/WHLSLArrayType.h: Added.
>+        (WebCore::WHLSL::AST::ArrayType::ArrayType):
>+        (WebCore::WHLSL::AST::ArrayType::type const):
>+        (WebCore::WHLSL::AST::ArrayType::type):
>+        (WebCore::WHLSL::AST::ArrayType::numElements const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLAssignmentExpression.h: Added.
>+        (WebCore::WHLSL::AST::AssignmentExpression::AssignmentExpression):
>+        (WebCore::WHLSL::AST::AssignmentExpression::left):
>+        (WebCore::WHLSL::AST::AssignmentExpression::right):
>+        * Modules/webgpu/WHLSL/AST/WHLSLBaseFunctionAttribute.h: Added.
>+        (WebCore::WHLSL::AST::BaseFunctionAttribute::BaseFunctionAttribute):
>+        * Modules/webgpu/WHLSL/AST/WHLSLBaseSemantic.h: Added.
>+        (WebCore::WHLSL::AST::BaseSemantic::BaseSemantic):
>+        * Modules/webgpu/WHLSL/AST/WHLSLBlock.h: Added.
>+        (WebCore::WHLSL::AST::Block::Block):
>+        (WebCore::WHLSL::AST::Block::statements):
>+        * Modules/webgpu/WHLSL/AST/WHLSLBooleanLiteral.h: Added.
>+        (WebCore::WHLSL::AST::BooleanLiteral::BooleanLiteral):
>+        (WebCore::WHLSL::AST::BooleanLiteral::value const):
>+        (WebCore::WHLSL::AST::BooleanLiteral::clone const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLBreak.h: Added.
>+        (WebCore::WHLSL::AST::Break::Break):
>+        * Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.cpp: Added.
>+        (WebCore::WHLSL::AST::BuiltInSemantic::isAcceptableType const):
>+        (WebCore::WHLSL::AST::BuiltInSemantic::isAcceptableForShaderItemDirection const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.h: Added.
>+        (WebCore::WHLSL::AST::BuiltInSemantic::BuiltInSemantic):
>+        (WebCore::WHLSL::AST::BuiltInSemantic::variable const):
>+        (WebCore::WHLSL::AST::BuiltInSemantic::operator== const):
>+        (WebCore::WHLSL::AST::BuiltInSemantic::operator!= const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLCallExpression.h: Added.
>+        (WebCore::WHLSL::AST::CallExpression::CallExpression):
>+        (WebCore::WHLSL::AST::CallExpression::arguments):
>+        (WebCore::WHLSL::AST::CallExpression::name):
>+        (WebCore::WHLSL::AST::CallExpression::setCastData):
>+        (WebCore::WHLSL::AST::CallExpression::isCast):
>+        (WebCore::WHLSL::AST::CallExpression::castReturnType):
>+        (WebCore::WHLSL::AST::CallExpression::hasOverloads const):
>+        (WebCore::WHLSL::AST::CallExpression::overloads):
>+        (WebCore::WHLSL::AST::CallExpression::setOverloads):
>+        (WebCore::WHLSL::AST::CallExpression::setFunction):
>+        * Modules/webgpu/WHLSL/AST/WHLSLCommaExpression.h: Added.
>+        (WebCore::WHLSL::AST::CommaExpression::CommaExpression):
>+        (WebCore::WHLSL::AST::CommaExpression::list):
>+        * Modules/webgpu/WHLSL/AST/WHLSLConstantExpression.h: Added.
>+        (WebCore::WHLSL::AST::ConstantExpression::ConstantExpression):
>+        (WebCore::WHLSL::AST::ConstantExpression::integerLiteral):
>+        (WebCore::WHLSL::AST::ConstantExpression::visit):
>+        (WebCore::WHLSL::AST::ConstantExpression::visit const):
>+        (WebCore::WHLSL::AST::ConstantExpression::clone const):
>+        (WebCore::WHLSL::AST::ConstantExpression::matches const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLConstantExpressionEnumerationMemberReference.h: Added.
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::ConstantExpressionEnumerationMemberReference):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::left const):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::right const):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::clone const):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::enumerationDefinition):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::enumerationDefinition const):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::enumerationMember):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::enumerationMember const):
>+        (WebCore::WHLSL::AST::ConstantExpressionEnumerationMemberReference::setEnumerationMember):
>+        * Modules/webgpu/WHLSL/AST/WHLSLContinue.h: Added.
>+        (WebCore::WHLSL::AST::Continue::Continue):
>+        * Modules/webgpu/WHLSL/AST/WHLSLDereferenceExpression.h: Added.
>+        (WebCore::WHLSL::AST::DereferenceExpression::DereferenceExpression):
>+        (WebCore::WHLSL::AST::DereferenceExpression::pointer):
>+        * Modules/webgpu/WHLSL/AST/WHLSLDoWhileLoop.h: Added.
>+        (WebCore::WHLSL::AST::DoWhileLoop::DoWhileLoop):
>+        (WebCore::WHLSL::AST::DoWhileLoop::body):
>+        (WebCore::WHLSL::AST::DoWhileLoop::conditional):
>+        * Modules/webgpu/WHLSL/AST/WHLSLDotExpression.h: Added.
>+        (WebCore::WHLSL::AST::DotExpression::DotExpression):
>+        (WebCore::WHLSL::AST::DotExpression::fieldName):
>+        * Modules/webgpu/WHLSL/AST/WHLSLEffectfulExpressionStatement.h: Added.
>+        (WebCore::WHLSL::AST::EffectfulExpressionStatement::EffectfulExpressionStatement):
>+        (WebCore::WHLSL::AST::EffectfulExpressionStatement::effectfulExpression):
>+        * Modules/webgpu/WHLSL/AST/WHLSLEnumerationDefinition.h: Added.
>+        (WebCore::WHLSL::AST::EnumerationDefinition::EnumerationDefinition):
>+        (WebCore::WHLSL::AST::EnumerationDefinition::type):
>+        (WebCore::WHLSL::AST::EnumerationDefinition::add):
>+        (WebCore::WHLSL::AST::EnumerationDefinition::memberByName):
>+        (WebCore::WHLSL::AST::EnumerationDefinition::enumerationMembers):
>+        * Modules/webgpu/WHLSL/AST/WHLSLEnumerationMember.h: Added.
>+        (WebCore::WHLSL::AST::EnumerationMember::EnumerationMember):
>+        (WebCore::WHLSL::AST::EnumerationMember::origin const):
>+        (WebCore::WHLSL::AST::EnumerationMember::name):
>+        (WebCore::WHLSL::AST::EnumerationMember::value):
>+        (WebCore::WHLSL::AST::EnumerationMember::setValue):
>+        * Modules/webgpu/WHLSL/AST/WHLSLEnumerationMemberLiteral.h: Added.
>+        (WebCore::WHLSL::AST::EnumerationMemberLiteral::EnumerationMemberLiteral):
>+        (WebCore::WHLSL::AST::EnumerationMemberLiteral::enumerationMember):
>+        * Modules/webgpu/WHLSL/AST/WHLSLExpression.h: Added.
>+        (WebCore::WHLSL::AST::Expression::Expression):
>+        (WebCore::WHLSL::AST::Expression::origin const):
>+        (WebCore::WHLSL::AST::Expression::isAssignmentExpression const):
>+        (WebCore::WHLSL::AST::Expression::isBooleanLiteral const):
>+        (WebCore::WHLSL::AST::Expression::isCallExpression const):
>+        (WebCore::WHLSL::AST::Expression::isCommaExpression const):
>+        (WebCore::WHLSL::AST::Expression::isDereferenceExpression const):
>+        (WebCore::WHLSL::AST::Expression::isDotExpression const):
>+        (WebCore::WHLSL::AST::Expression::isFloatLiteral const):
>+        (WebCore::WHLSL::AST::Expression::isIndexExpression const):
>+        (WebCore::WHLSL::AST::Expression::isIntegerLiteral const):
>+        (WebCore::WHLSL::AST::Expression::isLogicalExpression const):
>+        (WebCore::WHLSL::AST::Expression::isLogicalNotExpression const):
>+        (WebCore::WHLSL::AST::Expression::isMakeArrayReferenceExpression const):
>+        (WebCore::WHLSL::AST::Expression::isMakePointerExpression const):
>+        (WebCore::WHLSL::AST::Expression::isNullLiteral const):
>+        (WebCore::WHLSL::AST::Expression::isPropertyAccessExpression const):
>+        (WebCore::WHLSL::AST::Expression::isReadModifyWriteExpression const):
>+        (WebCore::WHLSL::AST::Expression::isTernaryExpression const):
>+        (WebCore::WHLSL::AST::Expression::isUnsignedIntegerLiteral const):
>+        (WebCore::WHLSL::AST::Expression::isVariableReference const):
>+        (WebCore::WHLSL::AST::Expression::isEnumerationMemberLiteral const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLFallthrough.h: Added.
>+        (WebCore::WHLSL::AST::Fallthrough::Fallthrough):
>+        * Modules/webgpu/WHLSL/AST/WHLSLFloatLiteral.h: Added.
>+        (WebCore::WHLSL::AST::FloatLiteral::FloatLiteral):
>+        (WebCore::WHLSL::AST::FloatLiteral::type):
>+        (WebCore::WHLSL::AST::FloatLiteral::value const):
>+        (WebCore::WHLSL::AST::FloatLiteral::clone const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.cpp: Added.
>+        (WebCore::WHLSL::AST::FloatLiteralType::FloatLiteralType):
>+        (WebCore::WHLSL::AST::FloatLiteralType::canResolve const):
>+        (WebCore::WHLSL::AST::FloatLiteralType::conversionCost const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.h: Added.
>+        (WebCore::WHLSL::AST::FloatLiteralType::preferredType):
>+        * Modules/webgpu/WHLSL/AST/WHLSLForLoop.h: Added.
>+        (WebCore::WHLSL::AST::ForLoop::ForLoop):
>+        (WebCore::WHLSL::AST::ForLoop::~ForLoop):
>+        (WebCore::WHLSL::AST::ForLoop::initialization):
>+        (WebCore::WHLSL::AST::ForLoop::condition):
>+        (WebCore::WHLSL::AST::ForLoop::increment):
>+        (WebCore::WHLSL::AST::ForLoop::body):
>+        * Modules/webgpu/WHLSL/AST/WHLSLFunctionAttribute.h: Added.
>+        * Modules/webgpu/WHLSL/AST/WHLSLFunctionDeclaration.h: Added.
>+        (WebCore::WHLSL::AST::FunctionDeclaration::FunctionDeclaration):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::isFunctionDefinition const):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::isNativeFunctionDeclaration const):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::attributeBlock):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::entryPointType const):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::type const):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::type):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::name const):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::isCast const):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::parameters const):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::parameters):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::semantic):
>+        (WebCore::WHLSL::AST::FunctionDeclaration::isOperator const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLFunctionDefinition.h: Added.
>+        (WebCore::WHLSL::AST::FunctionDefinition::FunctionDefinition):
>+        (WebCore::WHLSL::AST::FunctionDefinition::block):
>+        (WebCore::WHLSL::AST::FunctionDefinition::restricted const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLIfStatement.h: Added.
>+        (WebCore::WHLSL::AST::IfStatement::IfStatement):
>+        (WebCore::WHLSL::AST::IfStatement::conditional):
>+        (WebCore::WHLSL::AST::IfStatement::body):
>+        (WebCore::WHLSL::AST::IfStatement::elseBody):
>+        * Modules/webgpu/WHLSL/AST/WHLSLIndexExpression.h: Added.
>+        (WebCore::WHLSL::AST::IndexExpression::IndexExpression):
>+        (WebCore::WHLSL::AST::IndexExpression::indexExpression):
>+        * Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.cpp: Added.
>+        (WebCore::WHLSL::AST::IntegerLiteral::valueForSelectedType const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.h: Added.
>+        (WebCore::WHLSL::AST::IntegerLiteral::IntegerLiteral):
>+        (WebCore::WHLSL::AST::IntegerLiteral::type):
>+        (WebCore::WHLSL::AST::IntegerLiteral::value const):
>+        (WebCore::WHLSL::AST::IntegerLiteral::clone const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.cpp: Added.
>+        (WebCore::WHLSL::AST::IntegerLiteralType::IntegerLiteralType):
>+        (WebCore::WHLSL::AST::IntegerLiteralType::canResolve const):
>+        (WebCore::WHLSL::AST::IntegerLiteralType::conversionCost const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.h: Added.
>+        (WebCore::WHLSL::AST::IntegerLiteralType::preferredType):
>+        * Modules/webgpu/WHLSL/AST/WHLSLLogicalExpression.h: Added.
>+        (WebCore::WHLSL::AST::LogicalExpression::LogicalExpression):
>+        (WebCore::WHLSL::AST::LogicalExpression::type const):
>+        (WebCore::WHLSL::AST::LogicalExpression::left):
>+        (WebCore::WHLSL::AST::LogicalExpression::right):
>+        * Modules/webgpu/WHLSL/AST/WHLSLLogicalNotExpression.h: Added.
>+        (WebCore::WHLSL::AST::LogicalNotExpression::LogicalNotExpression):
>+        (WebCore::WHLSL::AST::LogicalNotExpression::operand):
>+        * Modules/webgpu/WHLSL/AST/WHLSLMakeArrayReferenceExpression.h: Added.
>+        (WebCore::WHLSL::AST::MakeArrayReferenceExpression::MakeArrayReferenceExpression):
>+        (WebCore::WHLSL::AST::MakeArrayReferenceExpression::lValue):
>+        * Modules/webgpu/WHLSL/AST/WHLSLMakePointerExpression.h: Added.
>+        (WebCore::WHLSL::AST::MakePointerExpression::MakePointerExpression):
>+        (WebCore::WHLSL::AST::MakePointerExpression::lValue):
>+        * Modules/webgpu/WHLSL/AST/WHLSLNamedType.h: Added.
>+        (WebCore::WHLSL::AST::NamedType::NamedType):
>+        (WebCore::WHLSL::AST::NamedType::origin const):
>+        (WebCore::WHLSL::AST::NamedType::name):
>+        (WebCore::WHLSL::AST::NamedType::isTypeDefinition const):
>+        (WebCore::WHLSL::AST::NamedType::isStructureDefinition const):
>+        (WebCore::WHLSL::AST::NamedType::isEnumerationDefinition const):
>+        (WebCore::WHLSL::AST::NamedType::isNativeTypeDeclaration const):
>+        (WebCore::WHLSL::AST::NamedType::unifyNode const):
>+        (WebCore::WHLSL::AST::NamedType::unifyNode):
>+        * Modules/webgpu/WHLSL/AST/WHLSLNativeFunctionDeclaration.h: Added.
>+        (WebCore::WHLSL::AST::NativeFunctionDeclaration::NativeFunctionDeclaration):
>+        (WebCore::WHLSL::AST::NativeFunctionDeclaration::restricted const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLNativeTypeDeclaration.h: Added.
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::NativeTypeDeclaration):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::name const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::name):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::typeArguments):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::isInt const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::isNumber const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::isFloating const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::isVector const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::isMatrix const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::isTexture const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::isSigned const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::std::function<bool const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::std::function<int64_t const):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::iterateAllValues):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIsInt):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIsNumber):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIsFloating):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIsVector):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIsMatrix):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIsTexture):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIsSigned):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setCanRepresentInteger):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setCanRepresentUnsignedInteger):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setCanRepresentFloat):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setSuccessor):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setFormatValueFromInteger):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setFormatValueFromUnsignedInteger):
>+        (WebCore::WHLSL::AST::NativeTypeDeclaration::setIterateAllValues):
>+        * Modules/webgpu/WHLSL/AST/WHLSLNode.h: Added.
>+        * Modules/webgpu/WHLSL/AST/WHLSLNullLiteral.h: Added.
>+        (WebCore::WHLSL::AST::NullLiteral::NullLiteral):
>+        (WebCore::WHLSL::AST::NullLiteral::type):
>+        (WebCore::WHLSL::AST::NullLiteral::clone const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.cpp: Added.
>+        (WebCore::WHLSL::AST::NullLiteralType::canResolve const):
>+        (WebCore::WHLSL::AST::NullLiteralType::conversionCost const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.h: Added.
>+        * Modules/webgpu/WHLSL/AST/WHLSLNumThreadsFunctionAttribute.h: Added.
>+        (WebCore::WHLSL::AST::NumThreadsFunctionAttribute::NumThreadsFunctionAttribute):
>+        (WebCore::WHLSL::AST::NumThreadsFunctionAttribute::width const):
>+        (WebCore::WHLSL::AST::NumThreadsFunctionAttribute::height const):
>+        (WebCore::WHLSL::AST::NumThreadsFunctionAttribute::depth const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLPointerType.h: Added.
>+        (WebCore::WHLSL::AST::PointerType::PointerType):
>+        * Modules/webgpu/WHLSL/AST/WHLSLPropertyAccessExpression.h: Added.
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::PropertyAccessExpression):
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::possibleGetOverloads):
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::possibleSetOverloads):
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::possibleAndOverloads):
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::setPossibleGetOverloads):
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::setPossibleSetOverloads):
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::setPossibleAndOverloads):
>+        (WebCore::WHLSL::AST::PropertyAccessExpression::base):
>+        * Modules/webgpu/WHLSL/AST/WHLSLQualifier.h: Added.
>+        * Modules/webgpu/WHLSL/AST/WHLSLReadModifyWriteExpression.h: Added.
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::create):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::setNewValueExpression):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::setResultExpression):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::oldVariableReference):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::newVariableReference):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::lValue):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::oldValue):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::newValue):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::newValueExpression):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::resultExpression):
>+        (WebCore::WHLSL::AST::ReadModifyWriteExpression::ReadModifyWriteExpression):
>+        * Modules/webgpu/WHLSL/AST/WHLSLReferenceType.h: Added.
>+        (WebCore::WHLSL::AST::ReferenceType::ReferenceType):
>+        (WebCore::WHLSL::AST::ReferenceType::addressSpace const):
>+        (WebCore::WHLSL::AST::ReferenceType::elementType const):
>+        (WebCore::WHLSL::AST::ReferenceType::elementType):
>+        * Modules/webgpu/WHLSL/AST/WHLSLResolvableType.h: Added.
>+        (WebCore::WHLSL::AST::ResolvableType::isFloatLiteralType const):
>+        (WebCore::WHLSL::AST::ResolvableType::isIntegerLiteralType const):
>+        (WebCore::WHLSL::AST::ResolvableType::isNullLiteralType const):
>+        (WebCore::WHLSL::AST::ResolvableType::isUnsignedIntegerLiteralType const):
>+        (WebCore::WHLSL::AST::ResolvableType::resolvedType const):
>+        (WebCore::WHLSL::AST::ResolvableType::resolvedType):
>+        (WebCore::WHLSL::AST::ResolvableType::resolve):
>+        * Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.cpp: Added.
>+        (WebCore::WHLSL::AST::ResourceSemantic::isAcceptableType const):
>+        (WebCore::WHLSL::AST::ResourceSemantic::isAcceptableForShaderItemDirection const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.h: Added.
>+        (WebCore::WHLSL::AST::ResourceSemantic::ResourceSemantic):
>+        (WebCore::WHLSL::AST::ResourceSemantic::mode const):
>+        (WebCore::WHLSL::AST::ResourceSemantic::index const):
>+        (WebCore::WHLSL::AST::ResourceSemantic::space const):
>+        (WebCore::WHLSL::AST::ResourceSemantic::operator== const):
>+        (WebCore::WHLSL::AST::ResourceSemantic::operator!= const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLReturn.h: Added.
>+        (WebCore::WHLSL::AST::Return::Return):
>+        (WebCore::WHLSL::AST::Return::value):
>+        (WebCore::WHLSL::AST::Return::function):
>+        (WebCore::WHLSL::AST::Return::setFunction):
>+        * Modules/webgpu/WHLSL/AST/WHLSLSemantic.h: Added.
>+        * Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.cpp: Added.
>+        (WebCore::WHLSL::AST::SpecializationConstantSemantic::isAcceptableType const):
>+        (WebCore::WHLSL::AST::SpecializationConstantSemantic::isAcceptableForShaderItemDirection const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.h: Added.
>+        (WebCore::WHLSL::AST::SpecializationConstantSemantic::SpecializationConstantSemantic):
>+        (WebCore::WHLSL::AST::SpecializationConstantSemantic::operator== const):
>+        (WebCore::WHLSL::AST::SpecializationConstantSemantic::operator!= const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.cpp: Added.
>+        (WebCore::WHLSL::AST::StageInOutSemantic::isAcceptableType const):
>+        (WebCore::WHLSL::AST::StageInOutSemantic::isAcceptableForShaderItemDirection const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.h: Added.
>+        (WebCore::WHLSL::AST::StageInOutSemantic::StageInOutSemantic):
>+        (WebCore::WHLSL::AST::StageInOutSemantic::index const):
>+        (WebCore::WHLSL::AST::StageInOutSemantic::operator== const):
>+        (WebCore::WHLSL::AST::StageInOutSemantic::operator!= const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLStatement.h: Added.
>+        (WebCore::WHLSL::AST::Statement::Statement):
>+        (WebCore::WHLSL::AST::Statement::isBlock const):
>+        (WebCore::WHLSL::AST::Statement::isBreak const):
>+        (WebCore::WHLSL::AST::Statement::isContinue const):
>+        (WebCore::WHLSL::AST::Statement::isDoWhileLoop const):
>+        (WebCore::WHLSL::AST::Statement::isEffectfulExpressionStatement const):
>+        (WebCore::WHLSL::AST::Statement::isFallthrough const):
>+        (WebCore::WHLSL::AST::Statement::isForLoop const):
>+        (WebCore::WHLSL::AST::Statement::isIfStatement const):
>+        (WebCore::WHLSL::AST::Statement::isReturn const):
>+        (WebCore::WHLSL::AST::Statement::isSwitchCase const):
>+        (WebCore::WHLSL::AST::Statement::isSwitchStatement const):
>+        (WebCore::WHLSL::AST::Statement::isTrap const):
>+        (WebCore::WHLSL::AST::Statement::isVariableDeclarationsStatement const):
>+        (WebCore::WHLSL::AST::Statement::isWhileLoop const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLStructureDefinition.h: Added.
>+        (WebCore::WHLSL::AST::StructureDefinition::StructureDefinition):
>+        (WebCore::WHLSL::AST::StructureDefinition::structureElements):
>+        * Modules/webgpu/WHLSL/AST/WHLSLStructureElement.h: Added.
>+        (WebCore::WHLSL::AST::StructureElement::StructureElement):
>+        (WebCore::WHLSL::AST::StructureElement::origin const):
>+        (WebCore::WHLSL::AST::StructureElement::type):
>+        (WebCore::WHLSL::AST::StructureElement::name):
>+        (WebCore::WHLSL::AST::StructureElement::semantic):
>+        * Modules/webgpu/WHLSL/AST/WHLSLSwitchCase.h: Added.
>+        (WebCore::WHLSL::AST::SwitchCase::SwitchCase):
>+        (WebCore::WHLSL::AST::SwitchCase::value):
>+        (WebCore::WHLSL::AST::SwitchCase::block):
>+        * Modules/webgpu/WHLSL/AST/WHLSLSwitchStatement.h: Added.
>+        (WebCore::WHLSL::AST::SwitchStatement::SwitchStatement):
>+        (WebCore::WHLSL::AST::SwitchStatement::value):
>+        (WebCore::WHLSL::AST::SwitchStatement::switchCases):
>+        * Modules/webgpu/WHLSL/AST/WHLSLTernaryExpression.h: Added.
>+        (WebCore::WHLSL::AST::TernaryExpression::TernaryExpression):
>+        (WebCore::WHLSL::AST::TernaryExpression::predicate):
>+        (WebCore::WHLSL::AST::TernaryExpression::bodyExpression):
>+        (WebCore::WHLSL::AST::TernaryExpression::elseExpression):
>+        * Modules/webgpu/WHLSL/AST/WHLSLTrap.h: Added.
>+        (WebCore::WHLSL::AST::Trap::Trap):
>+        * Modules/webgpu/WHLSL/AST/WHLSLType.h: Added.
>+        (WebCore::WHLSL::AST::Type::isNamedType const):
>+        (WebCore::WHLSL::AST::Type::isUnnamedType const):
>+        (WebCore::WHLSL::AST::Type::isResolvableType const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.cpp: Added.
>+        (WebCore::WHLSL::AST::clone):
>+        * Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.h: Added.
>+        * Modules/webgpu/WHLSL/AST/WHLSLTypeDefinition.h: Added.
>+        (WebCore::WHLSL::AST::TypeDefinition::TypeDefinition):
>+        (WebCore::WHLSL::AST::TypeDefinition::type):
>+        * Modules/webgpu/WHLSL/AST/WHLSLTypeReference.cpp: Added.
>+        (WebCore::WHLSL::AST::TypeReference::wrap):
>+        * Modules/webgpu/WHLSL/AST/WHLSLTypeReference.h: Added.
>+        (WebCore::WHLSL::AST::TypeReference::TypeReference):
>+        (WebCore::WHLSL::AST::TypeReference::name):
>+        (WebCore::WHLSL::AST::TypeReference::typeArguments):
>+        (WebCore::WHLSL::AST::TypeReference::resolvedType const):
>+        (WebCore::WHLSL::AST::TypeReference::setResolvedType):
>+        (WebCore::WHLSL::AST::TypeReference::cloneTypeReference const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLUnnamedType.h: Added.
>+        (WebCore::WHLSL::AST::UnnamedType::UnnamedType):
>+        (WebCore::WHLSL::AST::UnnamedType::isTypeReference const):
>+        (WebCore::WHLSL::AST::UnnamedType::isPointerType const):
>+        (WebCore::WHLSL::AST::UnnamedType::isArrayReferenceType const):
>+        (WebCore::WHLSL::AST::UnnamedType::isArrayType const):
>+        (WebCore::WHLSL::AST::UnnamedType::isReferenceType const):
>+        (WebCore::WHLSL::AST::UnnamedType::unifyNode const):
>+        (WebCore::WHLSL::AST::UnnamedType::unifyNode):
>+        (WebCore::WHLSL::AST::UnnamedType::origin const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.cpp: Added.
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteral::valueForSelectedType const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.h: Added.
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteral::UnsignedIntegerLiteral):
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteral::type):
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteral::value const):
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteral::clone const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.cpp: Added.
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteralType::UnsignedIntegerLiteralType):
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteralType::canResolve const):
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteralType::conversionCost const):
>+        * Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.h: Added.
>+        (WebCore::WHLSL::AST::UnsignedIntegerLiteralType::preferredType):
>+        * Modules/webgpu/WHLSL/AST/WHLSLValue.h: Added.
>+        (WebCore::WHLSL::AST::Value::Value):
>+        * Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h: Added.
>+        (WebCore::WHLSL::AST::VariableDeclaration::VariableDeclaration):
>+        (WebCore::WHLSL::AST::VariableDeclaration::origin const):
>+        (WebCore::WHLSL::AST::VariableDeclaration::name):
>+        (WebCore::WHLSL::AST::VariableDeclaration::type const):
>+        (WebCore::WHLSL::AST::VariableDeclaration::type):
>+        (WebCore::WHLSL::AST::VariableDeclaration::semantic):
>+        (WebCore::WHLSL::AST::VariableDeclaration::initializer):
>+        * Modules/webgpu/WHLSL/AST/WHLSLVariableDeclarationsStatement.h: Added.
>+        (WebCore::WHLSL::AST::VariableDeclarationsStatement::VariableDeclarationsStatement):
>+        (WebCore::WHLSL::AST::VariableDeclarationsStatement::variableDeclarations):
>+        * Modules/webgpu/WHLSL/AST/WHLSLVariableReference.h: Added.
>+        (WebCore::WHLSL::AST::VariableReference::VariableReference):
>+        (WebCore::WHLSL::AST::VariableReference::wrap):
>+        (WebCore::WHLSL::AST::VariableReference::name):
>+        (WebCore::WHLSL::AST::VariableReference::variable):
>+        (WebCore::WHLSL::AST::VariableReference::setVariable):
>+        * Modules/webgpu/WHLSL/AST/WHLSLWhileLoop.h: Added.
>+        (WebCore::WHLSL::AST::WhileLoop::WhileLoop):
>+        (WebCore::WHLSL::AST::WhileLoop::conditional):
>+        (WebCore::WHLSL::AST::WhileLoop::body):
>+        * Modules/webgpu/WHLSL/WHLSLLexer.cpp:
>+        * Modules/webgpu/WHLSL/WHLSLParser.cpp: Added.
>+        * Modules/webgpu/WHLSL/WHLSLParser.h: Added.
>+        * Modules/webgpu/WHLSL/WHLSLProgram.h: Added.
>+        (WebCore::WHLSL::Program::append):
>+        (WebCore::WHLSL::Program::nameContext):
>+        (WebCore::WHLSL::Program::intrinsics):
>+        (WebCore::WHLSL::Program::typeDefinitions):
>+        (WebCore::WHLSL::Program::structureDefinitions):
>+        (WebCore::WHLSL::Program::enumerationDefinitions):
>+        (WebCore::WHLSL::Program::functionDefinitions const):
>+        (WebCore::WHLSL::Program::functionDefinitions):
>+        (WebCore::WHLSL::Program::nativeFunctionDeclarations const):
>+        (WebCore::WHLSL::Program::nativeFunctionDeclarations):
>+        (WebCore::WHLSL::Program::nativeTypeDeclarations):
>+
> 2019-01-02  Wenson Hsieh  <wenson_hsieh@apple.com>
> 
>         Add support for using the current text selection as the find string on iOS
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLArrayReferenceType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLArrayReferenceType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..8e3dc88594ad86dbe65d431ee836ed68343ad926
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLArrayReferenceType.h
>@@ -0,0 +1,71 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLReferenceType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class ArrayReferenceType : public ReferenceType {
>+public:
>+    ArrayReferenceType(Lexer::Token&& origin, AddressSpace addressSpace, UniqueRef<UnnamedType>&& elementType)
>+        : ReferenceType(WTFMove(origin), addressSpace, WTFMove(elementType))
>+    {
>+    }
>+
>+    virtual ~ArrayReferenceType() = default;
>+
>+    ArrayReferenceType(const ArrayReferenceType&) = delete;
>+    ArrayReferenceType(ArrayReferenceType&&) = default;
>+
>+    bool isArrayReferenceType() const override { return true; }
>+
>+    UniqueRef<UnnamedType> clone() const override
>+    {
>+        return makeUniqueRef<ArrayReferenceType>(Lexer::Token(origin()), addressSpace(), elementType().clone());
>+    }
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_UNNAMED_TYPE(ArrayReferenceType, isArrayReferenceType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLArrayType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLArrayType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..89794b8080ad51a4cb6676540ab4edd48b4ccf3e
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLArrayType.h
>@@ -0,0 +1,80 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLTypeArgument.h"
>+#include "WHLSLUnnamedType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class ArrayType : public UnnamedType {
>+public:
>+    ArrayType(Lexer::Token&& origin, UniqueRef<UnnamedType>&& elementType, unsigned numElements)
>+        : UnnamedType(WTFMove(origin))
>+        , m_elementType(WTFMove(elementType))
>+        , m_numElements(numElements)
>+    {
>+    }
>+
>+    virtual ~ArrayType() = default;
>+
>+    ArrayType(const ArrayType&) = delete;
>+    ArrayType(ArrayType&&) = default;
>+
>+    bool isArrayType() const override { return true; }
>+
>+    const UnnamedType& type() const { return static_cast<const UnnamedType&>(m_elementType); }
>+    UnnamedType& type() { return static_cast<UnnamedType&>(m_elementType); }
>+    unsigned numElements() const { return m_numElements; }
>+
>+    UniqueRef<UnnamedType> clone() const override
>+    {
>+        return makeUniqueRef<ArrayType>(Lexer::Token(origin()), m_elementType->clone(), m_numElements);
>+    }
>+
>+private:
>+    UniqueRef<UnnamedType> m_elementType;
>+    unsigned m_numElements;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_UNNAMED_TYPE(ArrayType, isArrayType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLAssignmentExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLAssignmentExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..79eb1aec2210b476d3501f0e995a705780d49012
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLAssignmentExpression.h
>@@ -0,0 +1,72 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class AssignmentExpression : public Expression {
>+public:
>+    AssignmentExpression(Lexer::Token&& origin, UniqueRef<Expression>&& left, UniqueRef<Expression>&& right)
>+        : Expression(WTFMove(origin))
>+        , m_left(WTFMove(left))
>+        , m_right(WTFMove(right))
>+    {
>+    }
>+
>+    virtual ~AssignmentExpression() = default;
>+
>+    AssignmentExpression(const AssignmentExpression&) = delete;
>+    AssignmentExpression(AssignmentExpression&&) = default;
>+
>+    bool isAssignmentExpression() const override { return true; }
>+
>+    Expression& left() { return static_cast<Expression&>(m_left); }
>+    Expression& right() { return static_cast<Expression&>(m_right); }
>+
>+private:
>+    UniqueRef<Expression> m_left;
>+    UniqueRef<Expression> m_right;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(AssignmentExpression, isAssignmentExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBaseFunctionAttribute.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBaseFunctionAttribute.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..2731ed110f828820c9cb675628b9b2e419fe0b36
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBaseFunctionAttribute.h
>@@ -0,0 +1,61 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNode.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class BaseFunctionAttribute : public Node {
>+public:
>+    BaseFunctionAttribute(Lexer::Token&& origin)
>+        : m_origin(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~BaseFunctionAttribute() = default;
>+
>+    BaseFunctionAttribute(const BaseFunctionAttribute&) = delete;
>+    BaseFunctionAttribute(BaseFunctionAttribute&&) = default;
>+
>+private:
>+    Lexer::Token m_origin;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBaseSemantic.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBaseSemantic.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..fe99da24f64f9d6ed60604674ceb875634fb0feb
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBaseSemantic.h
>@@ -0,0 +1,74 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNode.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+class Intrinsics;
>+
>+namespace AST {
>+
>+class FunctionDefinition;
>+class UnnamedType;
>+
>+class BaseSemantic : public Node {
>+public:
>+    BaseSemantic(Lexer::Token&& origin)
>+        : m_origin(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~BaseSemantic() = default;
>+
>+    BaseSemantic(const BaseSemantic&) = delete;
>+    BaseSemantic(BaseSemantic&&) = default;
>+
>+    virtual bool isAcceptableType(const UnnamedType&, const Intrinsics&) const = 0;
>+
>+    enum class ShaderItemDirection : uint8_t {
>+        Input,
>+        Output
>+    };
>+    virtual bool isAcceptableForShaderItemDirection(ShaderItemDirection, const FunctionDefinition&) const = 0;
>+
>+private:
>+    Lexer::Token m_origin;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBlock.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBlock.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..e42a17861113944ab5ca3fb1628305695e34fe75
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBlock.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Block : public Statement {
>+public:
>+    Block(Lexer::Token&& origin, Statements&& statements)
>+        : Statement(WTFMove(origin))
>+        , m_statements(WTFMove(statements))
>+    {
>+    }
>+
>+    virtual ~Block() = default;
>+
>+    Block(const Block&) = delete;
>+    Block(Block&&) = default;
>+
>+    Statements& statements() { return m_statements; }
>+
>+    bool isBlock() const override { return true; }
>+
>+private:
>+    Statements m_statements;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(Block, isBlock())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBooleanLiteral.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBooleanLiteral.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..123d945f647a2c50431b6e16fc4e760cfb0e441c
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBooleanLiteral.h
>@@ -0,0 +1,76 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class BooleanLiteral : public Expression {
>+public:
>+    BooleanLiteral(Lexer::Token&& origin, bool value)
>+        : Expression(WTFMove(origin))
>+        , m_value(value)
>+    {
>+    }
>+
>+    virtual ~BooleanLiteral() = default;
>+
>+    BooleanLiteral(const BooleanLiteral&) = delete;
>+    BooleanLiteral(BooleanLiteral&&) = default;
>+
>+    BooleanLiteral& operator=(const BooleanLiteral&) = delete;
>+    BooleanLiteral& operator=(BooleanLiteral&&) = default;
>+
>+    bool value() const { return m_value; }
>+
>+    bool isBooleanLiteral() const override { return true; }
>+
>+    BooleanLiteral clone() const
>+    {
>+        return BooleanLiteral(Lexer::Token(origin()), m_value);
>+    }
>+
>+private:
>+    bool m_value;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(BooleanLiteral, isBooleanLiteral())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBreak.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBreak.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..965c00fb6c772d0900c29615a12a490a314ba89d
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBreak.h
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Break : public Statement {
>+public:
>+    Break(Lexer::Token&& origin)
>+        : Statement(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~Break() = default;
>+
>+    Break(const Break&) = delete;
>+    Break(Break&&) = default;
>+
>+    bool isBreak() const override { return true; }
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(Break, isBreak())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..ae3c78e28bd3778709cf73f5abab94ac753f7b83
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.cpp
>@@ -0,0 +1,46 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLBuiltInSemantic.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLFunctionDefinition.h"
>+#include "WHLSLTypeReference.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ebde1d084fd3772172a4f7f537a330f0a1610851
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.h
>@@ -0,0 +1,97 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBaseSemantic.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/Optional.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class BuiltInSemantic : public BaseSemantic {
>+public:
>+    enum class Variable : uint8_t {
>+        SVInstanceID,
>+        SVVertexID,
>+        PSize,
>+        SVPosition,
>+        SVIsFrontFace,
>+        SVSampleIndex,
>+        SVInnerCoverage,
>+        SVTarget,
>+        SVDepth,
>+        SVCoverage,
>+        SVDispatchThreadID,
>+        SVGroupID,
>+        SVGroupIndex,
>+        SVGroupThreadID
>+    };
>+
>+    BuiltInSemantic(Lexer::Token&& origin, Variable variable, Optional<unsigned>&& targetIndex = WTF::nullopt)
>+        : BaseSemantic(WTFMove(origin))
>+        , m_variable(variable)
>+        , m_targetIndex(WTFMove(targetIndex))
>+    {
>+    }
>+
>+    virtual ~BuiltInSemantic() = default;
>+
>+    BuiltInSemantic(const BuiltInSemantic&) = delete;
>+    BuiltInSemantic(BuiltInSemantic&&) = default;
>+
>+    Variable variable() const { return m_variable; }
>+
>+    bool operator==(const BuiltInSemantic& other) const
>+    {
>+        return m_variable == other.m_variable && m_targetIndex == other.m_targetIndex;
>+    }
>+
>+    bool operator!=(const BuiltInSemantic& other) const
>+    {
>+        return !(*this == other);
>+    }
>+
>+    bool isAcceptableType(const UnnamedType&, const Intrinsics&) const override;
>+    bool isAcceptableForShaderItemDirection(ShaderItemDirection, const FunctionDefinition&) const override;
>+
>+private:
>+    Variable m_variable;
>+    Optional<unsigned> m_targetIndex;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLCallExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLCallExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..0446ada825a44c38c925dc3a6718e85bcc9f5fa8
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLCallExpression.h
>@@ -0,0 +1,100 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLFunctionDeclaration.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NamedType;
>+
>+class CallExpression : public Expression {
>+public:
>+    CallExpression(Lexer::Token&& origin, String&& name, Vector<UniqueRef<Expression>>&& arguments)
>+        : Expression(WTFMove(origin))
>+        , m_name(WTFMove(name))
>+        , m_arguments(WTFMove(arguments))
>+    {
>+    }
>+
>+    virtual ~CallExpression() = default;
>+
>+    CallExpression(const CallExpression&) = delete;
>+    CallExpression(CallExpression&&) = default;
>+
>+    bool isCallExpression() const override { return true; }
>+
>+    Vector<UniqueRef<Expression>>& arguments() { return m_arguments; }
>+
>+    String& name() { return m_name; }
>+
>+    void setCastData(NamedType& namedType)
>+    {
>+        m_castReturnType = { namedType };
>+    }
>+
>+    bool isCast() { return static_cast<bool>(m_castReturnType); }
>+    Optional<std::reference_wrapper<NamedType>>& castReturnType() { return m_castReturnType; }
>+    bool hasOverloads() const { return static_cast<bool>(m_overloads); }
>+    Optional<Vector<std::reference_wrapper<FunctionDeclaration>, 1>>& overloads() { return m_overloads; }
>+    void setOverloads(const Vector<std::reference_wrapper<FunctionDeclaration>, 1>& overloads)
>+    {
>+        assert(!hasOverloads());
>+        m_overloads = overloads;
>+    }
>+
>+    void setFunction(FunctionDeclaration& functionDeclaration)
>+    {
>+        assert(!m_function);
>+        m_function = &functionDeclaration;
>+    }
>+
>+private:
>+    String m_name;
>+    Vector<UniqueRef<Expression>> m_arguments;
>+    Optional<Vector<std::reference_wrapper<FunctionDeclaration>, 1>> m_overloads;
>+    FunctionDeclaration* m_function { nullptr };
>+    Optional<std::reference_wrapper<NamedType>> m_castReturnType { WTF::nullopt };
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(CallExpression, isCallExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLCommaExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLCommaExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..9702c286488c4f0fcb636872620bcbb2396b61fe
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLCommaExpression.h
>@@ -0,0 +1,70 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class CommaExpression : public Expression {
>+public:
>+    CommaExpression(Lexer::Token&& origin, Vector<UniqueRef<Expression>>&& list)
>+        : Expression(WTFMove(origin))
>+        , m_list(WTFMove(list))
>+    {
>+    }
>+
>+    virtual ~CommaExpression() = default;
>+
>+    CommaExpression(const CommaExpression&) = delete;
>+    CommaExpression(CommaExpression&&) = default;
>+
>+    bool isCommaExpression() const override { return true; }
>+
>+    Vector<UniqueRef<Expression>>& list() { return m_list; }
>+
>+private:
>+    Vector<UniqueRef<Expression>> m_list;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(CommaExpression, isCommaExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLConstantExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLConstantExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..df68c2a1334d29e913bad45fcc41a257931c087a
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLConstantExpression.h
>@@ -0,0 +1,182 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBooleanLiteral.h"
>+#include "WHLSLConstantExpressionEnumerationMemberReference.h"
>+#include "WHLSLFloatLiteral.h"
>+#include "WHLSLIntegerLiteral.h"
>+#include "WHLSLNullLiteral.h"
>+#include "WHLSLUnsignedIntegerLiteral.h"
>+#include <wtf/Variant.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+// FIXME: macOS Sierra doesn't seem to support putting Variants inside Variants,
>+// so this is a wrapper class to make sure that doesn't happen. As soon as we don't
>+// have to support Sierra, this can be migrated to a Variant proper.
>+class ConstantExpression {
>+public:
>+    ConstantExpression(IntegerLiteral&& integerLiteral)
>+        : m_variant(WTFMove(integerLiteral))
>+    {
>+    }
>+
>+    ConstantExpression(UnsignedIntegerLiteral&& unsignedIntegerLiteral)
>+        : m_variant(WTFMove(unsignedIntegerLiteral))
>+    {
>+    }
>+
>+    ConstantExpression(FloatLiteral&& floatLiteral)
>+        : m_variant(WTFMove(floatLiteral))
>+    {
>+    }
>+
>+    ConstantExpression(NullLiteral&& nullLiteral)
>+        : m_variant(WTFMove(nullLiteral))
>+    {
>+    }
>+
>+    ConstantExpression(BooleanLiteral&& booleanLiteral)
>+        : m_variant(WTFMove(booleanLiteral))
>+    {
>+    }
>+
>+    ConstantExpression(ConstantExpressionEnumerationMemberReference&& constantExpressionEnumerationMemberReference)
>+        : m_variant(WTFMove(constantExpressionEnumerationMemberReference))
>+    {
>+    }
>+
>+    ConstantExpression(const ConstantExpression&) = delete;
>+    ConstantExpression(ConstantExpression&&) = default;
>+
>+    ConstantExpression& operator=(const ConstantExpression&) = delete;
>+    ConstantExpression& operator=(ConstantExpression&&) = default;
>+
>+    IntegerLiteral& integerLiteral()
>+    {
>+        ASSERT(WTF::holds_alternative<IntegerLiteral>(m_variant));
>+        return WTF::get<IntegerLiteral>(m_variant);
>+    }
>+
>+    template<typename T> void visit(T&& t)
>+    {
>+        WTF::visit(WTFMove(t), m_variant);
>+    }
>+
>+    template<typename T> void visit(T&& t) const
>+    {
>+        WTF::visit(WTFMove(t), m_variant);
>+    }
>+
>+    ConstantExpression clone() const
>+    {
>+        return WTF::visit(WTF::makeVisitor([&](const IntegerLiteral& integerLiteral) -> ConstantExpression {
>+            return integerLiteral.clone();
>+        }, [&](const UnsignedIntegerLiteral& unsignedIntegerLiteral) -> ConstantExpression {
>+            return unsignedIntegerLiteral.clone();
>+        }, [&](const FloatLiteral& floatLiteral) -> ConstantExpression {
>+            return floatLiteral.clone();
>+        }, [&](const NullLiteral& nullLiteral) -> ConstantExpression {
>+            return nullLiteral.clone();
>+        }, [&](const BooleanLiteral& booleanLiteral) -> ConstantExpression {
>+            return booleanLiteral.clone();
>+        }, [&](const ConstantExpressionEnumerationMemberReference& constantExpressionEnumerationMemberReference) -> ConstantExpression {
>+            return constantExpressionEnumerationMemberReference.clone();
>+        }), m_variant);
>+    }
>+
>+    bool matches(const ConstantExpression& other) const
>+    {
>+        Optional<bool> result;
>+        double value;
>+        visit(WTF::makeVisitor([&](const IntegerLiteral& integerLiteral) {
>+            value = integerLiteral.value();
>+        }, [&](const UnsignedIntegerLiteral& unsignedIntegerLiteral) {
>+            value = unsignedIntegerLiteral.value();
>+        }, [&](const FloatLiteral& floatLiteral) {
>+            value = floatLiteral.value();
>+        }, [&](const NullLiteral&) {
>+            result = WTF::holds_alternative<NullLiteral>(other.m_variant);
>+        }, [&](const BooleanLiteral& booleanLiteral) {
>+            if (WTF::holds_alternative<BooleanLiteral>(other.m_variant)) {
>+                const auto& otherBooleanLiteral = WTF::get<BooleanLiteral>(other.m_variant);
>+                result = booleanLiteral.value() == otherBooleanLiteral.value();
>+            } else
>+                result = false;
>+        }, [&](const ConstantExpressionEnumerationMemberReference& constantExpressionEnumerationMemberReference) {
>+            if (WTF::holds_alternative<ConstantExpressionEnumerationMemberReference>(other.m_variant)) {
>+                const auto& otherMemberReference = WTF::get<ConstantExpressionEnumerationMemberReference>(other.m_variant);
>+                result = constantExpressionEnumerationMemberReference.enumerationMember() == otherMemberReference.enumerationMember();
>+            } else
>+                result = false;
>+        }));
>+
>+        if (result)
>+            return *result;
>+
>+        other.visit(WTF::makeVisitor([&](const IntegerLiteral& integerLiteral) {
>+            result = value == integerLiteral.value();
>+        }, [&](const UnsignedIntegerLiteral& unsignedIntegerLiteral) {
>+            result = value == unsignedIntegerLiteral.value();
>+        }, [&](const FloatLiteral& floatLiteral) {
>+            result = value == floatLiteral.value();
>+        }, [&](const NullLiteral&) {
>+            result = false;
>+        }, [&](const BooleanLiteral&) {
>+            result = false;
>+        }, [&](const ConstantExpressionEnumerationMemberReference&) {
>+            result = false;
>+        }));
>+
>+        ASSERT(result);
>+        return *result;
>+    }
>+
>+private:
>+    Variant<
>+        IntegerLiteral,
>+        UnsignedIntegerLiteral,
>+        FloatLiteral,
>+        NullLiteral,
>+        BooleanLiteral,
>+        ConstantExpressionEnumerationMemberReference
>+        > m_variant;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLConstantExpressionEnumerationMemberReference.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLConstantExpressionEnumerationMemberReference.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..5857d947285b967ad11d916e0ee02fba5f150d0a
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLConstantExpressionEnumerationMemberReference.h
>@@ -0,0 +1,108 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class EnumerationDefinition;
>+class EnumerationMember;
>+
>+class ConstantExpressionEnumerationMemberReference : public Expression {
>+public:
>+    ConstantExpressionEnumerationMemberReference(Lexer::Token&& origin, String&& left, String&& right)
>+        : Expression(WTFMove(origin))
>+        , m_left(WTFMove(left))
>+        , m_right(WTFMove(right))
>+    {
>+    }
>+
>+    virtual ~ConstantExpressionEnumerationMemberReference() = default;
>+
>+    explicit ConstantExpressionEnumerationMemberReference(const ConstantExpressionEnumerationMemberReference&) = default;
>+    ConstantExpressionEnumerationMemberReference(ConstantExpressionEnumerationMemberReference&&) = default;
>+
>+    ConstantExpressionEnumerationMemberReference& operator=(const ConstantExpressionEnumerationMemberReference&) = delete;
>+    ConstantExpressionEnumerationMemberReference& operator=(ConstantExpressionEnumerationMemberReference&&) = default;
>+
>+    const String& left() const { return m_left; }
>+    const String& right() const { return m_right; }
>+
>+    ConstantExpressionEnumerationMemberReference clone() const
>+    {
>+        auto result = ConstantExpressionEnumerationMemberReference(Lexer::Token(origin()), String(m_left), String(m_right));
>+        result.m_enumerationMember = m_enumerationMember;
>+        return result;
>+    }
>+
>+    EnumerationDefinition* enumerationDefinition()
>+    {
>+        return m_enumerationDefinition;
>+    }
>+
>+    EnumerationDefinition* enumerationDefinition() const
>+    {
>+        return m_enumerationDefinition;
>+    }
>+
>+    EnumerationMember* enumerationMember()
>+    {
>+        return m_enumerationMember;
>+    }
>+
>+    EnumerationMember* enumerationMember() const
>+    {
>+        return m_enumerationMember;
>+    }
>+
>+    void setEnumerationMember(EnumerationDefinition& enumerationDefinition, EnumerationMember& enumerationMember)
>+    {
>+        m_enumerationDefinition = &enumerationDefinition;
>+        m_enumerationMember = &enumerationMember;
>+    }
>+
>+private:
>+    String m_left;
>+    String m_right;
>+    EnumerationDefinition* m_enumerationDefinition { nullptr };
>+    EnumerationMember* m_enumerationMember { nullptr };
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLContinue.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLContinue.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..db9e7b6a69ad1e7e032068deeb944826abf7ce14
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLContinue.h
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Continue : public Statement {
>+public:
>+    Continue(Lexer::Token&& origin)
>+        : Statement(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~Continue() = default;
>+
>+    Continue(const Continue&) = delete;
>+    Continue(Continue&&) = default;
>+
>+    bool isContinue() const override { return true; }
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(Continue, isContinue())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDereferenceExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDereferenceExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..545912ab38f7f8ac2144fafb7c4f2fa584a945a5
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDereferenceExpression.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class DereferenceExpression : public Expression {
>+public:
>+    DereferenceExpression(Lexer::Token&& origin, UniqueRef<Expression>&& pointer)
>+        : Expression(WTFMove(origin))
>+        , m_pointer(WTFMove(pointer))
>+    {
>+    }
>+
>+    virtual ~DereferenceExpression() = default;
>+
>+    DereferenceExpression(const DereferenceExpression&) = delete;
>+    DereferenceExpression(DereferenceExpression&&) = default;
>+
>+    bool isDereferenceExpression() const override { return true; }
>+
>+    Expression& pointer() { return static_cast<Expression&>(m_pointer); }
>+
>+private:
>+    UniqueRef<Expression> m_pointer;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(DereferenceExpression, isDereferenceExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDoWhileLoop.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDoWhileLoop.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..014783775e33e1c7749bbb3d53cd22f0377396b5
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDoWhileLoop.h
>@@ -0,0 +1,73 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class DoWhileLoop : public Statement {
>+public:
>+    DoWhileLoop(Lexer::Token&& origin, UniqueRef<Statement>&& body, UniqueRef<Expression>&& conditional)
>+        : Statement(WTFMove(origin))
>+        , m_body(WTFMove(body))
>+        , m_conditional(WTFMove(conditional))
>+    {
>+    }
>+
>+    virtual ~DoWhileLoop() = default;
>+
>+    DoWhileLoop(const DoWhileLoop&) = delete;
>+    DoWhileLoop(DoWhileLoop&&) = default;
>+
>+    bool isDoWhileLoop() const override { return true; }
>+
>+    Statement& body() { return static_cast<Statement&>(m_body); }
>+    Expression& conditional() { return static_cast<Expression&>(m_conditional); }
>+
>+private:
>+    UniqueRef<Statement> m_body;
>+    UniqueRef<Expression> m_conditional;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(DoWhileLoop, isDoWhileLoop())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDotExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDotExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..d2c19dbb2dbeca3849a2b4d80188ddedeb72f0ac
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLDotExpression.h
>@@ -0,0 +1,84 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLPropertyAccessExpression.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class DotExpression : public PropertyAccessExpression {
>+public:
>+    DotExpression(Lexer::Token&& origin, UniqueRef<Expression>&& base, String&& fieldName)
>+        : PropertyAccessExpression(WTFMove(origin), WTFMove(base))
>+        , m_fieldName(WTFMove(fieldName))
>+    {
>+    }
>+
>+    virtual ~DotExpression() = default;
>+
>+    DotExpression(const DotExpression&) = delete;
>+    DotExpression(DotExpression&&) = default;
>+
>+    bool isDotExpression() const override { return true; }
>+
>+    String getFunctionName() const override
>+    {
>+        return String::format("operator.%s", m_fieldName.utf8().data());
>+    }
>+
>+    String setFunctionName() const override
>+    {
>+        return String::format("operator.%s=", m_fieldName.utf8().data());
>+    }
>+
>+    String andFunctionName() const override
>+    {
>+        return String::format("operator&.%s", m_fieldName.utf8().data());
>+    }
>+
>+    String& fieldName() { return m_fieldName; }
>+
>+private:
>+    String m_fieldName;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(DotExpression, isDotExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEffectfulExpressionStatement.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEffectfulExpressionStatement.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..54d083a5c0680b75493bf4398d6b353e6d9f7597
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEffectfulExpressionStatement.h
>@@ -0,0 +1,70 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class EffectfulExpressionStatement : public Statement {
>+public:
>+    EffectfulExpressionStatement(UniqueRef<Expression>&& effectfulExpression)
>+        : Statement(Lexer::Token(effectfulExpression->origin()))
>+        , m_effectfulExpression(WTFMove(effectfulExpression))
>+    {
>+    }
>+
>+    virtual ~EffectfulExpressionStatement() = default;
>+
>+    EffectfulExpressionStatement(const EffectfulExpressionStatement&) = delete;
>+    EffectfulExpressionStatement(EffectfulExpressionStatement&&) = default;
>+
>+    bool isEffectfulExpressionStatement() const override { return true; }
>+
>+    Expression& effectfulExpression() { return static_cast<Expression&>(m_effectfulExpression); }
>+
>+private:
>+    UniqueRef<Expression> m_effectfulExpression;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(EffectfulExpressionStatement, isEffectfulExpressionStatement())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationDefinition.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationDefinition.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..55089a1ab7d1f0fa1840bfa1cb1acbf7384bdc0d
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationDefinition.h
>@@ -0,0 +1,99 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLEnumerationMember.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLNamedType.h"
>+#include "WHLSLUnnamedType.h"
>+#include <memory>
>+#include <wtf/HashMap.h>
>+#include <wtf/UniqueRef.h>
>+#include <wtf/Vector.h>
>+#include <wtf/text/StringHash.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class EnumerationDefinition : public NamedType {
>+public:
>+    EnumerationDefinition(Lexer::Token&& origin, String&& name, Optional<UniqueRef<UnnamedType>>&& type)
>+        : NamedType(WTFMove(origin), WTFMove(name))
>+        , m_type(WTFMove(type))
>+    {
>+    }
>+
>+    virtual ~EnumerationDefinition() = default;
>+
>+    EnumerationDefinition(const EnumerationDefinition&) = delete;
>+    EnumerationDefinition(EnumerationDefinition&&) = default;
>+
>+    bool isEnumerationDefinition() const override { return true; }
>+
>+    UnnamedType* type() { return m_type ? &static_cast<UnnamedType&>(*m_type) : nullptr; }
>+
>+    bool add(EnumerationMember&& member)
>+    {
>+        auto result = m_members.add(member.name(), std::make_unique<EnumerationMember>(WTFMove(member)));
>+        return !result.isNewEntry;
>+    }
>+
>+    EnumerationMember* memberByName(const String& name)
>+    {
>+        auto iterator = m_members.find(name);
>+        if (iterator == m_members.end())
>+            return nullptr;
>+        return iterator->value.get();
>+    }
>+
>+    Vector<std::reference_wrapper<EnumerationMember>> enumerationMembers()
>+    {
>+        Vector<std::reference_wrapper<EnumerationMember>> result;
>+        for (auto& pair : m_members)
>+            result.append(*pair.value);
>+        return result;
>+    }
>+
>+private:
>+    Optional<UniqueRef<UnnamedType>> m_type;
>+    HashMap<String, std::unique_ptr<EnumerationMember>> m_members;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_NAMED_TYPE(EnumerationDefinition, isEnumerationDefinition())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationMember.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationMember.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..8b61a722b66f4d8f0d706711439a01833ed404cc
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationMember.h
>@@ -0,0 +1,81 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLConstantExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLNode.h"
>+#include <wtf/Optional.h>
>+#include <wtf/Vector.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class EnumerationMember : public Node {
>+public:
>+    EnumerationMember(Lexer::Token&& origin, String&& name, Optional<ConstantExpression>&& value = WTF::nullopt)
>+        : m_origin(WTFMove(origin))
>+        , m_name(WTFMove(name))
>+        , m_value(WTFMove(value))
>+    {
>+    }
>+
>+    virtual ~EnumerationMember() = default;
>+
>+    EnumerationMember(const EnumerationMember&) = delete;
>+    EnumerationMember(EnumerationMember&&) = default;
>+
>+    const Lexer::Token& origin() const { return m_origin; }
>+    String& name() { return m_name; }
>+    Optional<ConstantExpression>& value() { return m_value; }
>+
>+    void setValue(ConstantExpression&& value)
>+    {
>+        ASSERT(!m_value);
>+        m_value = WTFMove(value);
>+    }
>+
>+private:
>+    Lexer::Token m_origin;
>+    String m_name;
>+    Optional<ConstantExpression> m_value;
>+};
>+
>+using EnumerationMembers = Vector<EnumerationMember>;
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationMemberLiteral.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationMemberLiteral.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ba64303802b1b5a4197d9916c1a1520b20f60cc9
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLEnumerationMemberLiteral.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLEnumerationMember.h"
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class EnumerationMemberLiteral : public Expression {
>+public:
>+    EnumerationMemberLiteral(Lexer::Token&& origin, EnumerationMember& enumerationMember)
>+        : Expression(WTFMove(origin))
>+        , m_enumerationMember(enumerationMember)
>+    {
>+    }
>+
>+    virtual ~EnumerationMemberLiteral() = default;
>+
>+    EnumerationMemberLiteral(const EnumerationMemberLiteral&) = delete;
>+    EnumerationMemberLiteral(EnumerationMemberLiteral&&) = default;
>+
>+    bool isEnumerationMemberLiteral() const override { return true; }
>+
>+    EnumerationMember& enumerationMember() { return m_enumerationMember; }
>+
>+private:
>+    EnumerationMember& m_enumerationMember;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(EnumerationMemberLiteral, isEnumerationMemberLiteral())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..741300dbeac4c9f2627889908010c1a853523724
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLExpression.h
>@@ -0,0 +1,92 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLValue.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Expression : public Value {
>+public:
>+    Expression(Lexer::Token&& origin)
>+        : m_origin(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~Expression() = default;
>+
>+    explicit Expression(const Expression&) = default;
>+    Expression(Expression&&) = default;
>+
>+    Expression& operator=(const Expression&) = default;
>+    Expression& operator=(Expression&&) = default;
>+
>+    const Lexer::Token& origin() const { return m_origin; }
>+
>+    virtual bool isAssignmentExpression() const { return false; }
>+    virtual bool isBooleanLiteral() const { return false; }
>+    virtual bool isCallExpression() const { return false; }
>+    virtual bool isCommaExpression() const { return false; }
>+    virtual bool isDereferenceExpression() const { return false; }
>+    virtual bool isDotExpression() const { return false; }
>+    virtual bool isFloatLiteral() const { return false; }
>+    virtual bool isIndexExpression() const { return false; }
>+    virtual bool isIntegerLiteral() const { return false; }
>+    virtual bool isLogicalExpression() const { return false; }
>+    virtual bool isLogicalNotExpression() const { return false; }
>+    virtual bool isMakeArrayReferenceExpression() const { return false; }
>+    virtual bool isMakePointerExpression() const { return false; }
>+    virtual bool isNullLiteral() const { return false; }
>+    virtual bool isPropertyAccessExpression() const { return false; }
>+    virtual bool isReadModifyWriteExpression() const { return false; }
>+    virtual bool isTernaryExpression() const { return false; }
>+    virtual bool isUnsignedIntegerLiteral() const { return false; }
>+    virtual bool isVariableReference() const { return false; }
>+    virtual bool isEnumerationMemberLiteral() const { return false; }
>+
>+private:
>+    Lexer::Token m_origin;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#define SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(ToValueTypeName, predicate) \
>+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WHLSL::AST::ToValueTypeName) \
>+    static bool isType(const WebCore::WHLSL::AST::Expression& expression) { return expression.predicate; } \
>+SPECIALIZE_TYPE_TRAITS_END()
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFallthrough.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFallthrough.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..36bcf4145405cb5cf50260b7ddd86bacf96b6846
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFallthrough.h
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Fallthrough : public Statement {
>+public:
>+    Fallthrough(Lexer::Token&& origin)
>+        : Statement(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~Fallthrough() = default;
>+
>+    Fallthrough(const Fallthrough&) = delete;
>+    Fallthrough(Fallthrough&&) = default;
>+
>+    bool isFallthrough() const override { return true; }
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(Fallthrough, isFallthrough())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteral.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteral.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..f1fb13feca5b2448c4341b8e7370d5fddb1185c9
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteral.h
>@@ -0,0 +1,83 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLFloatLiteralType.h"
>+#include "WHLSLLexer.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class FloatLiteral : public Expression {
>+public:
>+    FloatLiteral(Lexer::Token&& origin, float value)
>+        : Expression(Lexer::Token(origin))
>+        , m_type(WTFMove(origin), value)
>+        , m_value(value)
>+    {
>+    }
>+
>+    virtual ~FloatLiteral() = default;
>+
>+    FloatLiteral(const FloatLiteral&) = delete;
>+    FloatLiteral(FloatLiteral&&) = default;
>+
>+    FloatLiteral& operator=(const FloatLiteral&) = delete;
>+    FloatLiteral& operator=(FloatLiteral&&) = default;
>+
>+    FloatLiteralType& type() { return m_type; }
>+    float value() const { return m_value; }
>+
>+    bool isFloatLiteral() const override { return true; }
>+
>+    FloatLiteral clone() const
>+    {
>+        FloatLiteral result(Lexer::Token(origin()), m_value);
>+        if (result.m_type.resolvedType())
>+            result.m_type.resolve(result.m_type.resolvedType()->clone());
>+        return result;
>+    }
>+
>+private:
>+    FloatLiteralType m_type;
>+    float m_value;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(FloatLiteral, isFloatLiteral())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..4680932f6599cfdfdd0c6413c3114577ab5b70a3
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.cpp
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLFloatLiteralType.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLTypeReference.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+FloatLiteralType::FloatLiteralType(Lexer::Token&& origin, float value)
>+    : m_value(value)
>+    , m_preferredType(makeUniqueRef<TypeReference>(WTFMove(origin), String("float", String::ConstructFromLiteral), TypeArguments()))
>+{
>+}
>+
>+FloatLiteralType::~FloatLiteralType() = default;
>+
>+bool FloatLiteralType::canResolve(const Type&) const
>+{
>+    // FIXME: Implement this
>+    return true;
>+}
>+
>+unsigned FloatLiteralType::conversionCost(const UnnamedType&) const
>+{
>+    // FIXME: Implement this
>+    return 0;
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..f3a44326838d5098433b4de0844d3ebc3f56dfe9
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.h
>@@ -0,0 +1,78 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLResolvableType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class TypeReference;
>+
>+class FloatLiteralType : public ResolvableType {
>+public:
>+    FloatLiteralType(Lexer::Token&& origin, float value);
>+
>+    virtual ~FloatLiteralType();
>+
>+    FloatLiteralType(const FloatLiteralType&) = delete;
>+    FloatLiteralType(FloatLiteralType&&) = default;
>+
>+    FloatLiteralType& operator=(const FloatLiteralType&) = delete;
>+    FloatLiteralType& operator=(FloatLiteralType&&) = default;
>+
>+    bool isFloatLiteralType() const override { return true; }
>+
>+    TypeReference& preferredType() { return static_cast<TypeReference&>(m_preferredType); }
>+
>+    bool canResolve(const Type&) const override;
>+    unsigned conversionCost(const UnnamedType&) const override;
>+
>+    float value() const { return m_value; }
>+
>+private:
>+    float m_value;
>+    // This is a unique_ptr to resolve a circular dependency between
>+    // ConstantExpression -> LiteralType -> TypeReference -> TypeArguments -> ConstantExpression
>+    UniqueRef<TypeReference> m_preferredType;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_RESOLVABLE_TYPE(FloatLiteralType, isFloatLiteralType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLForLoop.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLForLoop.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..713edc92df7b524678cb8a813b35dc6471df46d2
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLForLoop.h
>@@ -0,0 +1,85 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include "WHLSLVariableDeclarationsStatement.h"
>+#include <memory>
>+#include <wtf/UniqueRef.h>
>+#include <wtf/Variant.h>
>+#include <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class ForLoop : public Statement {
>+public:
>+    ForLoop(Lexer::Token&& origin, Variant<VariableDeclarationsStatement, UniqueRef<Expression>>&& initialization, Optional<UniqueRef<Expression>>&& condition, Optional<UniqueRef<Expression>>&& increment, UniqueRef<Statement>&& body)
>+        : Statement(WTFMove(origin))
>+        , m_initialization(WTFMove(initialization))
>+        , m_condition(WTFMove(condition))
>+        , m_increment(WTFMove(increment))
>+        , m_body(WTFMove(body))
>+    {
>+    }
>+
>+    virtual ~ForLoop()
>+    {
>+    }
>+
>+    ForLoop(const ForLoop&) = delete;
>+    ForLoop(ForLoop&&) = default;
>+
>+    bool isForLoop() const override { return true; }
>+
>+    Variant<VariableDeclarationsStatement, UniqueRef<Expression>>& initialization() { return m_initialization; }
>+    Expression* condition() { return m_condition ? &static_cast<Expression&>(*m_condition) : nullptr; }
>+    Expression* increment() { return m_increment ? &static_cast<Expression&>(*m_increment) : nullptr; }
>+    Statement& body() { return static_cast<Statement&>(m_body); }
>+
>+private:
>+    Variant<VariableDeclarationsStatement, UniqueRef<Expression>> m_initialization;
>+    Optional<UniqueRef<Expression>> m_condition;
>+    Optional<UniqueRef<Expression>> m_increment;
>+    UniqueRef<Statement> m_body;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(ForLoop, isForLoop())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionAttribute.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionAttribute.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..32b0b0c4f6207f49708750302f7994ed5c7d8858
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionAttribute.h
>@@ -0,0 +1,49 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLNumThreadsFunctionAttribute.h"
>+#include <wtf/Variant.h>
>+#include <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+using FunctionAttribute = Variant<NumThreadsFunctionAttribute>;
>+using AttributeBlock = Vector<FunctionAttribute>;
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionDeclaration.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionDeclaration.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..190bbb80c30b35916ac2abc385b3bd594d3c672c
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionDeclaration.h
>@@ -0,0 +1,107 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLFunctionAttribute.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLNode.h"
>+#include "WHLSLSemantic.h"
>+#include "WHLSLUnnamedType.h"
>+#include "WHLSLVariableDeclaration.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class FunctionDeclaration : public Node {
>+public:
>+    enum class EntryPointType : uint8_t {
>+        Vertex,
>+        Fragment,
>+        Compute,
>+        // FIXME: Add an entry point type for testing
>+    };
>+
>+    FunctionDeclaration(Lexer::Token&& origin, AttributeBlock&& attributeBlock, Optional<EntryPointType> entryPointType, UniqueRef<UnnamedType>&& type, String&& name, VariableDeclarations&& parameters, Optional<Semantic>&& semantic, bool isOperator)
>+        : m_origin(WTFMove(origin))
>+        , m_attributeBlock(WTFMove(attributeBlock))
>+        , m_entryPointType(entryPointType)
>+        , m_type(WTFMove(type))
>+        , m_name(WTFMove(name))
>+        , m_parameters(WTFMove(parameters))
>+        , m_semantic(WTFMove(semantic))
>+        , m_isOperator(WTFMove(isOperator))
>+    {
>+    }
>+
>+    virtual ~FunctionDeclaration() = default;
>+
>+    FunctionDeclaration(const FunctionDeclaration&) = delete;
>+    FunctionDeclaration(FunctionDeclaration&&) = default;
>+
>+    virtual bool isFunctionDefinition() const { return false; }
>+    virtual bool isNativeFunctionDeclaration() const { return false; }
>+
>+    AttributeBlock& attributeBlock() { return m_attributeBlock; }
>+    const Optional<EntryPointType>& entryPointType() const { return m_entryPointType; }
>+    const UnnamedType& type() const { return static_cast<const UnnamedType&>(m_type); }
>+    UnnamedType& type() { return static_cast<UnnamedType&>(m_type); }
>+    const String& name() const { return m_name; }
>+    bool isCast() const { return m_name == "operator cast"; }
>+    const VariableDeclarations& parameters() const { return m_parameters; }
>+    VariableDeclarations& parameters() { return m_parameters; }
>+    Optional<Semantic>& semantic() { return m_semantic; }
>+    bool isOperator() const { return m_isOperator; }
>+
>+private:
>+    Lexer::Token m_origin;
>+    AttributeBlock m_attributeBlock;
>+    Optional<EntryPointType> m_entryPointType;
>+    UniqueRef<UnnamedType> m_type;
>+    String m_name;
>+    VariableDeclarations m_parameters;
>+    Optional<Semantic> m_semantic;
>+    bool m_isOperator;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#define SPECIALIZE_TYPE_TRAITS_WHLSL_FUNCTION_DECLARATION(ToValueTypeName, predicate) \
>+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WHLSL::AST::ToValueTypeName) \
>+    static bool isType(const WebCore::WHLSL::AST::FunctionDeclaration& type) { return type.predicate; } \
>+SPECIALIZE_TYPE_TRAITS_END()
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionDefinition.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionDefinition.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ce58b6a7f98965e2065c342be4478e5e0a6ea27e
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLFunctionDefinition.h
>@@ -0,0 +1,71 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBlock.h"
>+#include "WHLSLFunctionDeclaration.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class FunctionDefinition : public FunctionDeclaration {
>+public:
>+    FunctionDefinition(FunctionDeclaration&& functionDeclaration, Block&& block, bool restricted)
>+        : FunctionDeclaration(WTFMove(functionDeclaration))
>+        , m_block(WTFMove(block))
>+        , m_restricted(restricted)
>+    {
>+    }
>+
>+    virtual ~FunctionDefinition() = default;
>+
>+    FunctionDefinition(const FunctionDefinition&) = delete;
>+    FunctionDefinition(FunctionDefinition&&) = default;
>+
>+    bool isFunctionDefinition() const override { return true; }
>+
>+    Block& block() { return m_block; }
>+    bool restricted() const { return m_restricted; }
>+
>+private:
>+    Block m_block;
>+    bool m_restricted;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_FUNCTION_DECLARATION(FunctionDefinition, isFunctionDefinition())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIfStatement.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIfStatement.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..9b7cf4b37af6df0bd94ea279b480b13abecb3344
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIfStatement.h
>@@ -0,0 +1,77 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include <memory>
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class IfStatement : public Statement {
>+public:
>+    IfStatement(Lexer::Token&& origin, UniqueRef<Expression>&& conditional, UniqueRef<Statement>&& body, Optional<UniqueRef<Statement>>&& elseBody)
>+        : Statement(WTFMove(origin))
>+        , m_conditional(WTFMove(conditional))
>+        , m_body(WTFMove(body))
>+        , m_elseBody(WTFMove(elseBody))
>+    {
>+    }
>+
>+    virtual ~IfStatement() = default;
>+
>+    IfStatement(const IfStatement&) = delete;
>+    IfStatement(IfStatement&&) = default;
>+
>+    bool isIfStatement() const override { return true; }
>+
>+    Expression& conditional() { return static_cast<Expression&>(m_conditional); }
>+    Statement& body() { return static_cast<Statement&>(m_body); }
>+    Statement* elseBody() { return m_elseBody ? &static_cast<Statement&>(*m_elseBody) : nullptr; }
>+
>+private:
>+    UniqueRef<Expression> m_conditional;
>+    UniqueRef<Statement> m_body;
>+    Optional<UniqueRef<Statement>> m_elseBody;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(IfStatement, isIfStatement())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIndexExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIndexExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ab897740f3f2fdf4c3dcc6be86ef3a0c2d7a4820
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIndexExpression.h
>@@ -0,0 +1,84 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLPropertyAccessExpression.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class IndexExpression : public PropertyAccessExpression {
>+public:
>+    IndexExpression(Lexer::Token&& origin, UniqueRef<Expression>&& base, UniqueRef<Expression>&& index)
>+        : PropertyAccessExpression(WTFMove(origin), WTFMove(base))
>+        , m_index(WTFMove(index))
>+    {
>+    }
>+
>+    virtual ~IndexExpression() = default;
>+
>+    IndexExpression(const IndexExpression&) = delete;
>+    IndexExpression(IndexExpression&&) = default;
>+
>+    bool isIndexExpression() const override { return true; }
>+
>+    String getFunctionName() const override
>+    {
>+        return String("operator[]", String::ConstructFromLiteral);
>+    }
>+
>+    String setFunctionName() const override
>+    {
>+        return String("operator&[]", String::ConstructFromLiteral);
>+    }
>+
>+    String andFunctionName() const override
>+    {
>+        return String("operator[]=", String::ConstructFromLiteral);
>+    }
>+
>+    Expression& indexExpression() { return static_cast<Expression&>(m_index); }
>+
>+private:
>+    UniqueRef<Expression> m_index;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(IndexExpression, isIndexExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..3cf685a5250d587bc2c768f05def63871751e0db
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.cpp
>@@ -0,0 +1,55 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLIntegerLiteral.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLNativeTypeDeclaration.h"
>+#include "WHLSLTypeReference.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+int64_t IntegerLiteral::valueForSelectedType() const
>+{
>+    ASSERT(m_type.resolvedType());
>+    auto& typeReference = downcast<TypeReference>(*m_type.resolvedType());
>+    ASSERT(typeReference.resolvedType());
>+    auto& nativeTypeDeclaration = downcast<NativeTypeDeclaration>(*typeReference.resolvedType());
>+    return nativeTypeDeclaration.formatValueFromInteger()(m_value);
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..129aebdcdbea8cb283c21ee2a1f7c4dd9b8d63fd
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.h
>@@ -0,0 +1,85 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLIntegerLiteralType.h"
>+#include "WHLSLLexer.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class IntegerLiteral : public Expression {
>+public:
>+    IntegerLiteral(Lexer::Token&& origin, int value)
>+        : Expression(Lexer::Token(origin))
>+        , m_type(WTFMove(origin), value)
>+        , m_value(value)
>+    {
>+    }
>+
>+    virtual ~IntegerLiteral() = default;
>+
>+    IntegerLiteral(const IntegerLiteral&) = delete;
>+    IntegerLiteral(IntegerLiteral&&) = default;
>+
>+    IntegerLiteral& operator=(const IntegerLiteral&) = delete;
>+    IntegerLiteral& operator=(IntegerLiteral&&) = default;
>+
>+    IntegerLiteralType& type() { return m_type; }
>+    int value() const { return m_value; }
>+
>+    bool isIntegerLiteral() const override { return true; }
>+
>+    IntegerLiteral clone() const
>+    {
>+        IntegerLiteral result(Lexer::Token(origin()), m_value);
>+        if (result.m_type.resolvedType())
>+            result.m_type.resolve(result.m_type.resolvedType()->clone());
>+        return result;
>+    }
>+
>+    int64_t valueForSelectedType() const;
>+
>+private:
>+    IntegerLiteralType m_type;
>+    int m_value;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(IntegerLiteral, isIntegerLiteral())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..5b451eef5bdd1c1fbdb6d0b1710f28d2c51bb86f
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.cpp
>@@ -0,0 +1,63 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLIntegerLiteralType.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+IntegerLiteralType::IntegerLiteralType(Lexer::Token&& origin, int value)
>+    : m_value(value)
>+    , m_preferredType(makeUniqueRef<TypeReference>(WTFMove(origin), String("int", String::ConstructFromLiteral), TypeArguments()))
>+{
>+}
>+
>+IntegerLiteralType::~IntegerLiteralType() = default;
>+
>+bool IntegerLiteralType::canResolve(const Type&) const
>+{
>+    // FIXME: Implement this
>+    return true;
>+}
>+
>+unsigned IntegerLiteralType::conversionCost(const UnnamedType&) const
>+{
>+    // FIXME: Implement this
>+    return 0;
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..4e7d0ec587415d25423fed890fbeac1bb81af08c
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.h
>@@ -0,0 +1,78 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLResolvableType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class TypeReference;
>+
>+class IntegerLiteralType : public ResolvableType {
>+public:
>+    IntegerLiteralType(Lexer::Token&& origin, int value);
>+
>+    virtual ~IntegerLiteralType();
>+
>+    IntegerLiteralType(const IntegerLiteralType&) = delete;
>+    IntegerLiteralType(IntegerLiteralType&&) = default;
>+
>+    IntegerLiteralType& operator=(const IntegerLiteralType&) = delete;
>+    IntegerLiteralType& operator=(IntegerLiteralType&&) = default;
>+
>+    bool isIntegerLiteralType() const override { return true; }
>+
>+    TypeReference& preferredType() { return static_cast<TypeReference&>(m_preferredType); }
>+
>+    bool canResolve(const Type&) const override;
>+    unsigned conversionCost(const UnnamedType&) const override;
>+
>+    int value() const { return m_value; }
>+
>+private:
>+    int m_value;
>+    // This is a unique_ptr to resolve a circular dependency between
>+    // ConstantExpression -> LiteralType -> TypeReference -> TypeArguments -> ConstantExpression
>+    UniqueRef<TypeReference> m_preferredType;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_RESOLVABLE_TYPE(IntegerLiteralType, isIntegerLiteralType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLLogicalExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLLogicalExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ad35e88a1b0efc1687d4ae7eb5a25f9d34bc0ae2
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLLogicalExpression.h
>@@ -0,0 +1,81 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class LogicalExpression : public Expression {
>+public:
>+    enum class Type : uint8_t {
>+        And,
>+        Or
>+    };
>+
>+    LogicalExpression(Lexer::Token&& origin, Type type, UniqueRef<Expression>&& left, UniqueRef<Expression>&& right)
>+        : Expression(WTFMove(origin))
>+        , m_type(type)
>+        , m_left(WTFMove(left))
>+        , m_right(WTFMove(right))
>+    {
>+    }
>+
>+    virtual ~LogicalExpression() = default;
>+
>+    LogicalExpression(const LogicalExpression&) = delete;
>+    LogicalExpression(LogicalExpression&&) = default;
>+
>+    Type type() const { return m_type; }
>+
>+    bool isLogicalExpression() const override { return true; }
>+
>+    Expression& left() { return static_cast<Expression&>(m_left); }
>+    Expression& right() { return static_cast<Expression&>(m_right); }
>+
>+private:
>+    Type m_type;
>+    UniqueRef<Expression> m_left;
>+    UniqueRef<Expression> m_right;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(LogicalExpression, isLogicalExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLLogicalNotExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLLogicalNotExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..1a972be6b2d6a4b075f15b2a29614f14c843a599
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLLogicalNotExpression.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class LogicalNotExpression : public Expression {
>+public:
>+    LogicalNotExpression(Lexer::Token&& origin, UniqueRef<Expression>&& operand)
>+        : Expression(WTFMove(origin))
>+        , m_operand(WTFMove(operand))
>+    {
>+    }
>+
>+    virtual ~LogicalNotExpression() = default;
>+
>+    LogicalNotExpression(const LogicalNotExpression&) = delete;
>+    LogicalNotExpression(LogicalNotExpression&&) = default;
>+
>+    bool isLogicalNotExpression() const override { return true; }
>+
>+    Expression& operand() { return static_cast<Expression&>(m_operand); }
>+
>+private:
>+    UniqueRef<Expression> m_operand;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(LogicalNotExpression, isLogicalNotExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLMakeArrayReferenceExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLMakeArrayReferenceExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..bc019531df630ea4cfd5d3bec445e06d2ca8ea26
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLMakeArrayReferenceExpression.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class MakeArrayReferenceExpression : public Expression {
>+public:
>+    MakeArrayReferenceExpression(Lexer::Token&& origin, UniqueRef<Expression>&& lValue)
>+        : Expression(WTFMove(origin))
>+        , m_lValue(WTFMove(lValue))
>+    {
>+    }
>+
>+    virtual ~MakeArrayReferenceExpression() = default;
>+
>+    MakeArrayReferenceExpression(const MakeArrayReferenceExpression&) = delete;
>+    MakeArrayReferenceExpression(MakeArrayReferenceExpression&&) = default;
>+
>+    bool isMakeArrayReferenceExpression() const override { return true; }
>+
>+    Expression& lValue() { return static_cast<Expression&>(m_lValue); }
>+
>+private:
>+    UniqueRef<Expression> m_lValue;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(MakeArrayReferenceExpression, isMakeArrayReferenceExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLMakePointerExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLMakePointerExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..048a44401ea6b1492c51d4e090a6d4b09e54ad15
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLMakePointerExpression.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class MakePointerExpression : public Expression {
>+public:
>+    MakePointerExpression(Lexer::Token&& origin, UniqueRef<Expression>&& lValue)
>+        : Expression(WTFMove(origin))
>+        , m_lValue(WTFMove(lValue))
>+    {
>+    }
>+
>+    virtual ~MakePointerExpression() = default;
>+
>+    MakePointerExpression(const MakePointerExpression&) = delete;
>+    MakePointerExpression(MakePointerExpression&&) = default;
>+
>+    bool isMakePointerExpression() const override { return true; }
>+
>+    Expression& lValue() { return static_cast<Expression&>(m_lValue); }
>+
>+private:
>+    UniqueRef<Expression> m_lValue;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(MakePointerExpression, isMakePointerExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNamedType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNamedType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..8aa7c5e384b83883b688ab7e2ea0002de0afb35e
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNamedType.h
>@@ -0,0 +1,84 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNode.h"
>+#include "WHLSLType.h"
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NamedType : public Type {
>+public:
>+    NamedType(Lexer::Token&& origin, String&& name)
>+        : m_origin(WTFMove(origin))
>+        , m_name(WTFMove(name))
>+    {
>+    }
>+
>+    virtual ~NamedType() = default;
>+
>+    NamedType(const NamedType&) = delete;
>+    NamedType(NamedType&&) = default;
>+
>+    const Lexer::Token& origin() const { return m_origin; }
>+    String& name() { return m_name; }
>+
>+    bool isNamedType() const override { return true; }
>+    virtual bool isTypeDefinition() const { return false; }
>+    virtual bool isStructureDefinition() const { return false; }
>+    virtual bool isEnumerationDefinition() const { return false; }
>+    virtual bool isNativeTypeDeclaration() const { return false; }
>+
>+    virtual const Type& unifyNode() const { return *this; }
>+    virtual Type& unifyNode() { return *this; }
>+
>+private:
>+    Lexer::Token m_origin;
>+    String m_name;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#define SPECIALIZE_TYPE_TRAITS_WHLSL_NAMED_TYPE(ToValueTypeName, predicate) \
>+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WHLSL::AST::ToValueTypeName) \
>+    static bool isType(const WebCore::WHLSL::AST::NamedType& type) { return type.predicate; } \
>+SPECIALIZE_TYPE_TRAITS_END()
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_TYPE(NamedType, isNamedType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNativeFunctionDeclaration.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNativeFunctionDeclaration.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..d81a38c28f84b3913a49556a365a3dd9798ada38
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNativeFunctionDeclaration.h
>@@ -0,0 +1,67 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLFunctionDeclaration.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NativeFunctionDeclaration : public FunctionDeclaration {
>+public:
>+    NativeFunctionDeclaration(FunctionDeclaration&& functionDeclaration, bool restricted)
>+        : FunctionDeclaration(WTFMove(functionDeclaration))
>+        , m_restricted(restricted)
>+    {
>+    }
>+
>+    virtual ~NativeFunctionDeclaration() = default;
>+
>+    NativeFunctionDeclaration(const NativeFunctionDeclaration&) = delete;
>+    NativeFunctionDeclaration(NativeFunctionDeclaration&&) = default;
>+
>+    bool isNativeFunctionDeclaration() const override { return true; }
>+
>+    bool restricted() const { return m_restricted; }
>+
>+private:
>+    bool m_restricted;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_FUNCTION_DECLARATION(NativeFunctionDeclaration, isNativeFunctionDeclaration())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNativeTypeDeclaration.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNativeTypeDeclaration.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..3dbc504b18d3ff8ddca17b69d8e357cbcb8bb675
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNativeTypeDeclaration.h
>@@ -0,0 +1,117 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNamedType.h"
>+#include "WHLSLTypeArgument.h"
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NativeTypeDeclaration : public NamedType {
>+public:
>+    NativeTypeDeclaration(Lexer::Token&& origin, String&& name, TypeArguments&& typeArguments)
>+        : NamedType(WTFMove(origin), WTFMove(name))
>+        , m_typeArguments(WTFMove(typeArguments))
>+    {
>+    }
>+
>+    virtual ~NativeTypeDeclaration() = default;
>+
>+    NativeTypeDeclaration(const NativeTypeDeclaration&) = delete;
>+    NativeTypeDeclaration(NativeTypeDeclaration&&) = default;
>+
>+    bool isNativeTypeDeclaration() const override { return true; }
>+
>+    const String& name() const { return m_name; }
>+    String& name() { return m_name; }
>+    TypeArguments& typeArguments() { return m_typeArguments; }
>+
>+    bool isInt() const { return m_isInt; }
>+    bool isNumber() const { return m_isNumber; }
>+    bool isFloating() const { return m_isFloating; }
>+    bool isVector() const { return m_isVector; }
>+    bool isMatrix() const { return m_isMatrix; }
>+    bool isTexture() const { return m_isTexture; }
>+    bool isSigned() const { return m_isSigned; }
>+    const std::function<bool(int)>& canRepresentInteger() const { return m_canRepresentInteger; }
>+    const std::function<bool(unsigned)>& canRepresentUnsignedInteger() const { return m_canRepresentUnsignedInteger; }
>+    const std::function<bool(float)>& canRepresentFloat() const { return m_canRepresentFloat; }
>+    const std::function<int64_t(int64_t)>& successor() const { return m_successor; }
>+    const std::function<int64_t(int)>& formatValueFromInteger() const { return m_formatValueFromInteger; }
>+    const std::function<int64_t(unsigned)>& formatValueFromUnsignedInteger() const { return m_formatValueFromUnsignedInteger; }
>+    void iterateAllValues(const std::function<bool(int64_t)>& callback) { m_iterateAllValues(callback); }
>+
>+    void setIsInt() { m_isInt = true; }
>+    void setIsNumber() { m_isNumber = true; }
>+    void setIsFloating() { m_isFloating = true; }
>+    void setIsVector() { m_isVector = true; }
>+    void setIsMatrix() { m_isMatrix = true; }
>+    void setIsTexture() { m_isTexture = true; }
>+    void setIsSigned() { m_isSigned = true; }
>+    void setCanRepresentInteger(std::function<bool(int)>&& canRepresent) { m_canRepresentInteger = WTFMove(canRepresent); }
>+    void setCanRepresentUnsignedInteger(std::function<bool(unsigned)>&& canRepresent) { m_canRepresentUnsignedInteger = WTFMove(canRepresent); }
>+    void setCanRepresentFloat(std::function<bool(float)>&& canRepresent) { m_canRepresentFloat = WTFMove(canRepresent); }
>+    void setSuccessor(std::function<int64_t(int64_t)>&& successor) { m_successor = WTFMove(successor); }
>+    void setFormatValueFromInteger(std::function<int64_t(int)>&& formatValue) { m_formatValueFromInteger = WTFMove(formatValue); }
>+    void setFormatValueFromUnsignedInteger(std::function<int64_t(unsigned)>&& formatValue) { m_formatValueFromUnsignedInteger = WTFMove(formatValue); }
>+    void setIterateAllValues(std::function<void(const std::function<bool(int64_t)>&)>&& iterateAllValues) { m_iterateAllValues = WTFMove(iterateAllValues); }
>+
>+private:
>+    String m_name;
>+    TypeArguments m_typeArguments;
>+    std::function<bool(int)> m_canRepresentInteger;
>+    std::function<bool(unsigned)> m_canRepresentUnsignedInteger;
>+    std::function<bool(float)> m_canRepresentFloat;
>+    std::function<int64_t(int64_t)> m_successor;
>+    std::function<int64_t(int)> m_formatValueFromInteger;
>+    std::function<int64_t(unsigned)> m_formatValueFromUnsignedInteger;
>+    std::function<void(const std::function<bool(int64_t)>&)> m_iterateAllValues;
>+    bool m_isInt { false };
>+    bool m_isNumber { false };
>+    bool m_isFloating { false };
>+    bool m_isVector { false };
>+    bool m_isMatrix { false };
>+    bool m_isTexture { false };
>+    bool m_isSigned { false };
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_NAMED_TYPE(NativeTypeDeclaration, isNativeTypeDeclaration())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNode.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNode.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..9429b7818004e98fdf91d50dcbbd667705fa5840
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNode.h
>@@ -0,0 +1,57 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Node {
>+public:
>+    Node() = default;
>+
>+    virtual ~Node() = default;
>+
>+    explicit Node(const Node&) = default;
>+    Node(Node&&) = default;
>+
>+    Node& operator=(const Node&) = default;
>+    Node& operator=(Node&&) = default;
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteral.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteral.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..5eb0150394ea171e6bec6792129fc94e86dc1554
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteral.h
>@@ -0,0 +1,79 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLNullLiteralType.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NullLiteral : public Expression {
>+public:
>+    NullLiteral(Lexer::Token&& origin)
>+        : Expression(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~NullLiteral() = default;
>+
>+    NullLiteral(const NullLiteral&) = delete;
>+    NullLiteral(NullLiteral&&) = default;
>+
>+    NullLiteral& operator=(const NullLiteral&) = delete;
>+    NullLiteral& operator=(NullLiteral&&) = default;
>+
>+    NullLiteralType& type() { return m_type; }
>+
>+    bool isNullLiteral() const override { return true; }
>+
>+    NullLiteral clone() const
>+    {
>+        auto result = NullLiteral(Lexer::Token(origin()));
>+        if (result.m_type.resolvedType())
>+            result.m_type.resolve(result.m_type.resolvedType()->clone());
>+        return result;
>+    }
>+
>+private:
>+    NullLiteralType m_type;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(NullLiteral, isNullLiteral())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..15d0905a5bb902d1d28161b81afda64ce0ccb381
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.cpp
>@@ -0,0 +1,60 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLNullLiteralType.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLReferenceType.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+bool NullLiteralType::canResolve(const Type& type) const
>+{
>+    if (!is<UnnamedType>(type))
>+        return false;
>+    auto& unnamedType = downcast<UnnamedType>(type);
>+    if (!is<ReferenceType>(unnamedType))
>+        return false;
>+    return true;
>+}
>+
>+unsigned NullLiteralType::conversionCost(const UnnamedType&) const
>+{
>+    return 0;
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..f6568fa4c40027778769825ce174d2f6075c04b9
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.h
>@@ -0,0 +1,66 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLResolvableType.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NullLiteralType : public ResolvableType {
>+public:
>+    NullLiteralType() = default;
>+
>+    virtual ~NullLiteralType() = default;
>+
>+    NullLiteralType(const NullLiteralType&) = delete;
>+    NullLiteralType(NullLiteralType&&) = default;
>+
>+    NullLiteralType& operator=(const NullLiteralType&) = delete;
>+    NullLiteralType& operator=(NullLiteralType&&) = default;
>+
>+    bool isNullLiteralType() const override { return true; }
>+
>+    bool canResolve(const Type&) const override;
>+    unsigned conversionCost(const UnnamedType&) const override;
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_RESOLVABLE_TYPE(NullLiteralType, isNullLiteralType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNumThreadsFunctionAttribute.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNumThreadsFunctionAttribute.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..38e298fc0d2f2c44fd90ccb443837687a5e701f8
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLNumThreadsFunctionAttribute.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBaseFunctionAttribute.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NumThreadsFunctionAttribute : public BaseFunctionAttribute {
>+public:
>+    NumThreadsFunctionAttribute(Lexer::Token&& origin, unsigned width, unsigned height, unsigned depth)
>+        : BaseFunctionAttribute(WTFMove(origin))
>+        , m_width(width)
>+        , m_height(height)
>+        , m_depth(depth)
>+    {
>+    }
>+
>+    virtual ~NumThreadsFunctionAttribute() = default;
>+
>+    NumThreadsFunctionAttribute(const NumThreadsFunctionAttribute&) = delete;
>+    NumThreadsFunctionAttribute(NumThreadsFunctionAttribute&&) = default;
>+
>+    unsigned width() const { return m_width; }
>+    unsigned height() const { return m_height; }
>+    unsigned depth() const { return m_depth; }
>+
>+private:
>+    unsigned m_width;
>+    unsigned m_height;
>+    unsigned m_depth;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLPointerType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLPointerType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ae692d0ab7d50c8f4ac08bb03691beb3b69ed18f
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLPointerType.h
>@@ -0,0 +1,71 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLReferenceType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class PointerType : public ReferenceType {
>+public:
>+    PointerType(Lexer::Token&& origin, AddressSpace addressSpace, UniqueRef<UnnamedType> elementType)
>+        : ReferenceType(WTFMove(origin), addressSpace, WTFMove(elementType))
>+    {
>+    }
>+
>+    virtual ~PointerType() = default;
>+
>+    PointerType(const PointerType&) = delete;
>+    PointerType(PointerType&&) = default;
>+
>+    bool isPointerType() const override { return true; }
>+
>+    UniqueRef<UnnamedType> clone() const override
>+    {
>+        return makeUniqueRef<PointerType>(Lexer::Token(origin()), addressSpace(), elementType().clone());
>+    }
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_UNNAMED_TYPE(PointerType, isPointerType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLPropertyAccessExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLPropertyAccessExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..e28755edb2bb9b90dee0ae762a3831d0a03aded7
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLPropertyAccessExpression.h
>@@ -0,0 +1,93 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class PropertyAccessExpression : public Expression {
>+public:
>+    PropertyAccessExpression(Lexer::Token&& origin, UniqueRef<Expression>&& base)
>+        : Expression(WTFMove(origin))
>+        , m_base(WTFMove(base))
>+    {
>+    }
>+
>+    virtual ~PropertyAccessExpression() = default;
>+
>+    PropertyAccessExpression(const PropertyAccessExpression&) = delete;
>+    PropertyAccessExpression(PropertyAccessExpression&&) = default;
>+
>+    bool isPropertyAccessExpression() const override { return true; }
>+
>+    virtual String getFunctionName() const = 0;
>+    virtual String setFunctionName() const = 0;
>+    virtual String andFunctionName() const = 0;
>+
>+    Vector<std::reference_wrapper<FunctionDeclaration>, 1>& possibleGetOverloads() { return m_possibleGetOverloads; }
>+    Vector<std::reference_wrapper<FunctionDeclaration>, 1>& possibleSetOverloads() { return m_possibleSetOverloads; }
>+    Vector<std::reference_wrapper<FunctionDeclaration>, 1>& possibleAndOverloads() { return m_possibleAndOverloads; }
>+
>+    void setPossibleGetOverloads(const Vector<std::reference_wrapper<FunctionDeclaration>, 1>& overloads)
>+    {
>+        m_possibleGetOverloads = overloads;
>+    }
>+    void setPossibleSetOverloads(const Vector<std::reference_wrapper<FunctionDeclaration>, 1>& overloads)
>+    {
>+        m_possibleSetOverloads = overloads;
>+    }
>+    void setPossibleAndOverloads(const Vector<std::reference_wrapper<FunctionDeclaration>, 1>& overloads)
>+    {
>+        m_possibleAndOverloads = overloads;
>+    }
>+
>+    Expression& base() { return static_cast<Expression&>(m_base); }
>+
>+private:
>+    UniqueRef<Expression> m_base;
>+    Vector<std::reference_wrapper<FunctionDeclaration>, 1> m_possibleGetOverloads;
>+    Vector<std::reference_wrapper<FunctionDeclaration>, 1> m_possibleSetOverloads;
>+    Vector<std::reference_wrapper<FunctionDeclaration>, 1> m_possibleAndOverloads;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(PropertyAccessExpression, isPropertyAccessExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLQualifier.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLQualifier.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..295d6dd18297d319d8b5c62cdb120bd4e09556a8
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLQualifier.h
>@@ -0,0 +1,57 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLType.h"
>+#include <wtf/Vector.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+enum class Qualifier : uint8_t {
>+    Nointerpolation,
>+    Noperspective,
>+    Uniform,
>+    Centroid,
>+    Sample
>+};
>+
>+using Qualifiers = Vector<Qualifier>;
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReadModifyWriteExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReadModifyWriteExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..f29b29393eae224aa2d674ec25a8165906a2e6b9
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReadModifyWriteExpression.h
>@@ -0,0 +1,120 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLVariableDeclaration.h"
>+#include "WHLSLVariableReference.h"
>+#include <memory>
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+/*
>+ *  1. Evaluate m_lValue
>+ *  2. Assign the result to m_oldValue
>+ *  3. Evaluate m_newValueExpression
>+ *  4. Assign the result to m_newValue
>+ *  5. Assign the result to m_lValue
>+ *  6. Evaluate m_resultExpression
>+ *  7. Return the result
>+ */
>+class ReadModifyWriteExpression : public Expression {
>+public:
>+    static UniqueRef<ReadModifyWriteExpression> create(Lexer::Token&& origin, UniqueRef<Expression> lValue)
>+    {
>+        return makeUniqueRef<ReadModifyWriteExpression>(WTFMove(origin), WTFMove(lValue));
>+    }
>+
>+    virtual ~ReadModifyWriteExpression() = default;
>+
>+    ReadModifyWriteExpression(const ReadModifyWriteExpression&) = delete;
>+    ReadModifyWriteExpression(ReadModifyWriteExpression&&) = default;
>+
>+    void setNewValueExpression(UniqueRef<Expression>&& newValueExpression)
>+    {
>+        m_newValueExpression = WTFMove(newValueExpression);
>+    }
>+
>+    void setResultExpression(UniqueRef<Expression>&& resultExpression)
>+    {
>+        m_resultExpression = WTFMove(resultExpression);
>+    }
>+
>+    UniqueRef<VariableReference> oldVariableReference()
>+    {
>+        // The only reason we don't get use-after-frees is the fact that every instance of ReadModifyWriteExpression is allocated on the heap.
>+        return makeUniqueRef<VariableReference>(VariableReference::wrap(m_oldValue));
>+    }
>+
>+    UniqueRef<VariableReference> newVariableReference()
>+    {
>+        // The only reason we don't get use-after-frees is the fact that every instance of ReadModifyWriteExpression is allocated on the heap.
>+        return makeUniqueRef<VariableReference>(VariableReference::wrap(m_newValue));
>+    }
>+
>+    bool isReadModifyWriteExpression() const override { return true; }
>+
>+    Expression& lValue() { return static_cast<Expression&>(m_lValue); }
>+    VariableDeclaration& oldValue() { return m_oldValue; }
>+    VariableDeclaration& newValue() { return m_newValue; }
>+    Expression* newValueExpression() { return m_newValueExpression ? &static_cast<Expression&>(*m_newValueExpression) : nullptr; }
>+    Expression* resultExpression() { return m_resultExpression ? &static_cast<Expression&>(*m_resultExpression) : nullptr; }
>+
>+private:
>+    template<class U, class... Args> friend UniqueRef<U> WTF::makeUniqueRef(Args&&...);
>+
>+    ReadModifyWriteExpression(Lexer::Token&& origin, UniqueRef<Expression> lValue)
>+        : Expression(Lexer::Token(origin))
>+        , m_lValue(WTFMove(lValue))
>+        , m_oldValue(Lexer::Token(origin), Qualifiers(), WTF::nullopt, String(), WTF::nullopt, WTF::nullopt)
>+        , m_newValue(WTFMove(origin), Qualifiers(), WTF::nullopt, String(), WTF::nullopt, WTF::nullopt)
>+    {
>+    }
>+
>+    UniqueRef<Expression> m_lValue;
>+    VariableDeclaration m_oldValue;
>+    VariableDeclaration m_newValue;
>+    Optional<UniqueRef<Expression>> m_newValueExpression;
>+    Optional<UniqueRef<Expression>> m_resultExpression;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(ReadModifyWriteExpression, isReadModifyWriteExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReferenceType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReferenceType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..64c84bcb4c395ed3766c37bc71bc05beed279af5
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReferenceType.h
>@@ -0,0 +1,81 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLUnnamedType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class ReferenceType : public UnnamedType {
>+public:
>+    enum class AddressSpace : uint8_t {
>+        Constant,
>+        Device,
>+        Threadgroup,
>+        Thread
>+    };
>+
>+    ReferenceType(Lexer::Token&& origin, AddressSpace addressSpace, UniqueRef<UnnamedType>&& elementType)
>+        : UnnamedType(WTFMove(origin))
>+        , m_addressSpace(addressSpace)
>+        , m_elementType(WTFMove(elementType))
>+    {
>+    }
>+
>+    virtual ~ReferenceType() = default;
>+
>+    ReferenceType(const ReferenceType&) = delete;
>+    ReferenceType(ReferenceType&&) = default;
>+
>+    bool isReferenceType() const override { return false; }
>+
>+    AddressSpace addressSpace() const { return m_addressSpace; }
>+    const UnnamedType& elementType() const { return static_cast<const UnnamedType&>(m_elementType); }
>+    UnnamedType& elementType() { return static_cast<UnnamedType&>(m_elementType); }
>+
>+private:
>+    AddressSpace m_addressSpace;
>+    UniqueRef<UnnamedType> m_elementType;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_UNNAMED_TYPE(ReferenceType, isReferenceType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResolvableType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResolvableType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..cd71bd4cc4b842fdfeee1249a367384173ddd646
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResolvableType.h
>@@ -0,0 +1,86 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLType.h"
>+#include "WHLSLUnnamedType.h"
>+#include <memory>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class ResolvableType : public Type {
>+public:
>+    ResolvableType() = default;
>+
>+    virtual ~ResolvableType() = default;
>+
>+    ResolvableType(const ResolvableType&) = delete;
>+    ResolvableType(ResolvableType&&) = default;
>+
>+    ResolvableType& operator=(const ResolvableType&) = delete;
>+    ResolvableType& operator=(ResolvableType&&) = default;
>+
>+    bool isResolvableType() const override { return true; }
>+    virtual bool isFloatLiteralType() const { return false; }
>+    virtual bool isIntegerLiteralType() const { return false; }
>+    virtual bool isNullLiteralType() const { return false; }
>+    virtual bool isUnsignedIntegerLiteralType() const { return false; }
>+
>+    virtual bool canResolve(const Type&) const = 0;
>+    virtual unsigned conversionCost(const UnnamedType&) const = 0;
>+
>+    const UnnamedType* resolvedType() const { return m_resolvedType ? &static_cast<const UnnamedType&>(*m_resolvedType) : nullptr; }
>+    UnnamedType* resolvedType() { return m_resolvedType ? &static_cast<UnnamedType&>(*m_resolvedType) : nullptr; }
>+
>+    void resolve(UniqueRef<UnnamedType>&& type)
>+    {
>+        m_resolvedType = WTFMove(type);
>+    }
>+
>+private:
>+    Optional<UniqueRef<UnnamedType>> m_resolvedType;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#define SPECIALIZE_TYPE_TRAITS_WHLSL_RESOLVABLE_TYPE(ToValueTypeName, predicate) \
>+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WHLSL::AST::ToValueTypeName) \
>+    static bool isType(const WebCore::WHLSL::AST::ResolvableType& type) { return type.predicate; } \
>+SPECIALIZE_TYPE_TRAITS_END()
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_TYPE(ResolvableType, isResolvableType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..636588868b10370e890ec3e412821597e186219b
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.cpp
>@@ -0,0 +1,47 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLResourceSemantic.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLArrayType.h"
>+#include "WHLSLReferenceType.h"
>+#include "WHLSLTypeReference.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..4b02be0207bc3c81fd2929bbb0e1e598b32cddd8
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.h
>@@ -0,0 +1,90 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBaseSemantic.h"
>+#include "WHLSLLexer.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class ResourceSemantic : public BaseSemantic {
>+public:
>+    enum class Mode : uint8_t {
>+        UnorderedAccessView,
>+        Texture,
>+        Buffer,
>+        Sampler
>+    };
>+
>+    ResourceSemantic(Lexer::Token&& origin, Mode mode, unsigned index, unsigned space)
>+        : BaseSemantic(WTFMove(origin))
>+        , m_mode(mode)
>+        , m_index(index)
>+        , m_space(space)
>+    {
>+    }
>+
>+    virtual ~ResourceSemantic() = default;
>+
>+    ResourceSemantic(const ResourceSemantic&) = delete;
>+    ResourceSemantic(ResourceSemantic&&) = default;
>+
>+    Mode mode() const { return m_mode; }
>+    unsigned index() const { return m_index; }
>+    unsigned space() const { return m_space; }
>+
>+    bool operator==(const ResourceSemantic& other) const
>+    {
>+        return m_mode == other.m_mode && m_index == other.m_index && m_space == other.m_space;
>+    }
>+
>+    bool operator!=(const ResourceSemantic& other) const
>+    {
>+        return !(*this == other);
>+    }
>+
>+    bool isAcceptableType(const UnnamedType&, const Intrinsics&) const override;
>+    bool isAcceptableForShaderItemDirection(ShaderItemDirection, const FunctionDefinition&) const override;
>+
>+private:
>+    Mode m_mode;
>+    unsigned m_index;
>+    unsigned m_space;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReturn.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReturn.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..77eb24684f04722485644daf49b72078303cf45a
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLReturn.h
>@@ -0,0 +1,75 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include <memory>
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Return : public Statement {
>+public:
>+    Return(Lexer::Token&& origin, Optional<UniqueRef<Expression>>&& value)
>+        : Statement(WTFMove(origin))
>+        , m_value(WTFMove(value))
>+    {
>+    }
>+
>+    virtual ~Return() = default;
>+
>+    Return(const Return&) = delete;
>+    Return(Return&&) = default;
>+
>+    bool isReturn() const override { return true; }
>+
>+    Expression* value() { return m_value ? &static_cast<Expression&>(*m_value) : nullptr; }
>+
>+    FunctionDefinition* function() { return m_function; }
>+    void setFunction(FunctionDefinition* functionDefinition) { m_function = functionDefinition; }
>+
>+private:
>+    Optional<UniqueRef<Expression>> m_value;
>+    FunctionDefinition* m_function;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(Return, isReturn())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSemantic.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSemantic.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..94cb806b5bf9b19bf500243218e563a3ebab14ed
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSemantic.h
>@@ -0,0 +1,50 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBuiltInSemantic.h"
>+#include "WHLSLResourceSemantic.h"
>+#include "WHLSLSpecializationConstantSemantic.h"
>+#include "WHLSLStageInOutSemantic.h"
>+#include <wtf/Variant.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+using Semantic = Variant<BuiltInSemantic, ResourceSemantic, SpecializationConstantSemantic, StageInOutSemantic>;
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..a57dccc536e1e9a69a4fef389c3a6cbcd3202fce
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.cpp
>@@ -0,0 +1,45 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLSpecializationConstantSemantic.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLTypeReference.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..d62abbcebe550e2b81901982c6893b38bc4cf240
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.h
>@@ -0,0 +1,73 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBaseSemantic.h"
>+#include "WHLSLLexer.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class SpecializationConstantSemantic : public BaseSemantic {
>+public:
>+    SpecializationConstantSemantic(Lexer::Token&& origin)
>+        : BaseSemantic(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~SpecializationConstantSemantic() = default;
>+
>+    SpecializationConstantSemantic(const SpecializationConstantSemantic&) = delete;
>+    SpecializationConstantSemantic(SpecializationConstantSemantic&&) = default;
>+
>+    bool operator==(const SpecializationConstantSemantic&) const
>+    {
>+        return true;
>+    }
>+
>+    bool operator!=(const SpecializationConstantSemantic&) const
>+    {
>+        return false;
>+    }
>+
>+    bool isAcceptableType(const UnnamedType&, const Intrinsics&) const override;
>+    bool isAcceptableForShaderItemDirection(ShaderItemDirection, const FunctionDefinition&) const override;
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..5553552de4d5a30b7b765e0d3441aac4d1b9cfb5
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.cpp
>@@ -0,0 +1,48 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLStageInOutSemantic.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLArrayType.h"
>+#include "WHLSLEnumerationDefinition.h"
>+#include "WHLSLFunctionDefinition.h"
>+#include "WHLSLTypeReference.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..4ae8532ad7c7e2ce8e850667cacf788615f6069a
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.h
>@@ -0,0 +1,77 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBaseSemantic.h"
>+#include "WHLSLLexer.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class StageInOutSemantic : public BaseSemantic {
>+public:
>+    StageInOutSemantic(Lexer::Token&& origin, unsigned index)
>+        : BaseSemantic(WTFMove(origin))
>+        , m_index(index)
>+    {
>+    }
>+
>+    virtual ~StageInOutSemantic() = default;
>+
>+    StageInOutSemantic(const StageInOutSemantic&) = delete;
>+    StageInOutSemantic(StageInOutSemantic&&) = default;
>+
>+    unsigned index() const { return m_index; }
>+
>+    bool operator==(const StageInOutSemantic& other) const
>+    {
>+        return m_index == other.m_index;
>+    }
>+
>+    bool operator!=(const StageInOutSemantic& other) const
>+    {
>+        return !(*this == other);
>+    }
>+
>+    bool isAcceptableType(const UnnamedType&, const Intrinsics&) const override;
>+    bool isAcceptableForShaderItemDirection(ShaderItemDirection, const FunctionDefinition&) const override;
>+
>+private:
>+    unsigned m_index;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStatement.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStatement.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..b56c19c24c3be51788c41d842632a228b19c4a51
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStatement.h
>@@ -0,0 +1,84 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLValue.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Statement : public Value {
>+public:
>+    Statement(Lexer::Token&& origin)
>+        : m_origin(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~Statement() = default;
>+
>+    Statement(const Statement&) = delete;
>+    Statement(Statement&&) = default;
>+
>+    virtual bool isBlock() const { return false; }
>+    virtual bool isBreak() const { return false; }
>+    virtual bool isContinue() const { return false; }
>+    virtual bool isDoWhileLoop() const { return false; }
>+    virtual bool isEffectfulExpressionStatement() const { return false; }
>+    virtual bool isFallthrough() const { return false; }
>+    virtual bool isForLoop() const { return false; }
>+    virtual bool isIfStatement() const { return false; }
>+    virtual bool isReturn() const { return false; }
>+    virtual bool isSwitchCase() const { return false; }
>+    virtual bool isSwitchStatement() const { return false; }
>+    virtual bool isTrap() const { return false; }
>+    virtual bool isVariableDeclarationsStatement() const { return false; }
>+    virtual bool isWhileLoop() const { return false; }
>+
>+private:
>+    Lexer::Token m_origin;
>+};
>+
>+using Statements = Vector<UniqueRef<Statement>>;
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#define SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(ToValueTypeName, predicate) \
>+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WHLSL::AST::ToValueTypeName) \
>+    static bool isType(const WebCore::WHLSL::AST::Statement& statement) { return statement.predicate; } \
>+SPECIALIZE_TYPE_TRAITS_END()
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStructureDefinition.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStructureDefinition.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..456c6e1238bcb57e7cfe1e017869f0f41440a769
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStructureDefinition.h
>@@ -0,0 +1,71 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNamedType.h"
>+#include "WHLSLStructureElement.h"
>+#include <wtf/Vector.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class StructureDefinition : public NamedType {
>+public:
>+    StructureDefinition(Lexer::Token&& origin, String&& name, StructureElements&& structureElements)
>+        : NamedType(WTFMove(origin), WTFMove(name))
>+        , m_structureElements(WTFMove(structureElements))
>+    {
>+    }
>+
>+    virtual ~StructureDefinition() = default;
>+
>+    StructureDefinition(const StructureDefinition&) = delete;
>+    StructureDefinition(StructureDefinition&&) = default;
>+
>+    bool isStructureDefinition() const override { return true; }
>+
>+    StructureElements& structureElements() { return m_structureElements; }
>+
>+private:
>+    StructureElements m_structureElements;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_NAMED_TYPE(StructureDefinition, isStructureDefinition())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStructureElement.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStructureElement.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..4cd64e2e28afe56cbb8cf032c149fa696ac4e6eb
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLStructureElement.h
>@@ -0,0 +1,80 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNode.h"
>+#include "WHLSLQualifier.h"
>+#include "WHLSLSemantic.h"
>+#include "WHLSLType.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class StructureElement : public Node {
>+public:
>+    StructureElement(Lexer::Token&& origin, Qualifiers&& qualifiers, UniqueRef<UnnamedType>&& type, String&& name, Optional<Semantic> semantic)
>+        : m_origin(WTFMove(origin))
>+        , m_qualifiers(WTFMove(qualifiers))
>+        , m_type(WTFMove(type))
>+        , m_name(WTFMove(name))
>+        , m_semantic(WTFMove(semantic))
>+    {
>+    }
>+
>+    virtual ~StructureElement() = default;
>+
>+    StructureElement(const StructureElement&) = delete;
>+    StructureElement(StructureElement&&) = default;
>+
>+    const Lexer::Token& origin() const { return m_origin; }
>+    UnnamedType& type() { return static_cast<UnnamedType&>(m_type); }
>+    const String& name() { return m_name; }
>+    Optional<Semantic>& semantic() { return m_semantic; }
>+
>+private:
>+    Lexer::Token m_origin;
>+    Qualifiers m_qualifiers;
>+    UniqueRef<UnnamedType> m_type;
>+    String m_name;
>+    Optional<Semantic> m_semantic;
>+};
>+
>+using StructureElements = Vector<StructureElement>;
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSwitchCase.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSwitchCase.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..fe9f8a8eb5756d63f922ea6a9239a8c2b57e46fb
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSwitchCase.h
>@@ -0,0 +1,74 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLBlock.h"
>+#include "WHLSLConstantExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include <wtf/Optional.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class SwitchCase : public Statement {
>+public:
>+    SwitchCase(Lexer::Token&& origin, Optional<ConstantExpression>&& value, Block&& block)
>+        : Statement(WTFMove(origin))
>+        , m_value(WTFMove(value))
>+        , m_block(WTFMove(block))
>+    {
>+    }
>+
>+    virtual ~SwitchCase() = default;
>+
>+    SwitchCase(const SwitchCase&) = delete;
>+    SwitchCase(SwitchCase&&) = default;
>+
>+    bool isSwitchCase() const override { return true; }
>+
>+    Optional<ConstantExpression>& value() { return m_value; }
>+    Block& block() { return m_block; }
>+
>+private:
>+    Optional<ConstantExpression> m_value;
>+    Block m_block;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(SwitchCase, isSwitchCase())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSwitchStatement.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSwitchStatement.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..6b19d70422c94d99ed13904205063de12148b532
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLSwitchStatement.h
>@@ -0,0 +1,74 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include "WHLSLSwitchCase.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class SwitchStatement : public Statement {
>+public:
>+    SwitchStatement(Lexer::Token&& origin, UniqueRef<Expression>&& value, Vector<SwitchCase>&& switchCases)
>+        : Statement(WTFMove(origin))
>+        , m_value(WTFMove(value))
>+        , m_switchCases(WTFMove(switchCases))
>+    {
>+    }
>+
>+    virtual ~SwitchStatement() = default;
>+
>+    SwitchStatement(const SwitchStatement&) = delete;
>+    SwitchStatement(SwitchStatement&&) = default;
>+
>+    bool isSwitchStatement() const override { return true; }
>+
>+    Expression& value() { return static_cast<Expression&>(m_value); }
>+    Vector<SwitchCase>& switchCases() { return m_switchCases; }
>+
>+private:
>+    UniqueRef<Expression> m_value;
>+    Vector<SwitchCase> m_switchCases;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(SwitchStatement, isSwitchStatement())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTernaryExpression.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTernaryExpression.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..b41d12b5d229fd7d49d0f8590e9fde1a50806c2d
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTernaryExpression.h
>@@ -0,0 +1,75 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class TernaryExpression : public Expression {
>+public:
>+    TernaryExpression(Lexer::Token&& origin, UniqueRef<Expression>&& predicate, UniqueRef<Expression>&& bodyExpression, UniqueRef<Expression>&& elseExpression)
>+        : Expression(WTFMove(origin))
>+        , m_predicate(WTFMove(predicate))
>+        , m_bodyExpression(WTFMove(bodyExpression))
>+        , m_elseExpression(WTFMove(elseExpression))
>+    {
>+    }
>+
>+    virtual ~TernaryExpression() = default;
>+
>+    TernaryExpression(const TernaryExpression&) = delete;
>+    TernaryExpression(TernaryExpression&&) = default;
>+
>+    bool isTernaryExpression() const override { return true; }
>+
>+    Expression& predicate() { return static_cast<Expression&>(m_predicate); }
>+    Expression& bodyExpression() { return static_cast<Expression&>(m_bodyExpression); }
>+    Expression& elseExpression() { return static_cast<Expression&>(m_elseExpression); }
>+
>+private:
>+    UniqueRef<Expression> m_predicate;
>+    UniqueRef<Expression> m_bodyExpression;
>+    UniqueRef<Expression> m_elseExpression;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(TernaryExpression, isTernaryExpression())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTrap.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTrap.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..d280e717c08e117471ae76128d0e58c43beb0ba2
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTrap.h
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Trap : public Statement {
>+public:
>+    Trap(Lexer::Token&& origin)
>+        : Statement(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~Trap() = default;
>+
>+    Trap(const Trap&) = delete;
>+    Trap(Trap&&) = default;
>+
>+    bool isTrap() const override { return true; }
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(Trap, isTrap())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..c59e49646438f853ac908f8a63cc440d0d53b503
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLType.h
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLNode.h"
>+#include <wtf/TypeCasts.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Type : public Node {
>+public:
>+    Type() = default;
>+
>+    virtual ~Type() = default;
>+
>+    explicit Type(const Type&) = delete;
>+    Type(Type&&) = default;
>+
>+    Type& operator=(const Type&) = delete;
>+    Type& operator=(Type&&) = default;
>+
>+    virtual bool isNamedType() const { return false; }
>+    virtual bool isUnnamedType() const { return false; }
>+    virtual bool isResolvableType() const { return false; }
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#define SPECIALIZE_TYPE_TRAITS_WHLSL_TYPE(ToValueTypeName, predicate) \
>+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WHLSL::AST::ToValueTypeName) \
>+    static bool isType(const WebCore::WHLSL::AST::Type& type) { return type.predicate; } \
>+SPECIALIZE_TYPE_TRAITS_END()
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..23ef91096b595a0c70167901366f6e3fb2eb5850
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.cpp
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLTypeArgument.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLConstantExpression.h"
>+#include "WHLSLTypeReference.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/Variant.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+TypeArguments clone(const TypeArguments& typeArguments)
>+{
>+    TypeArguments result;
>+    for (const auto& typeArgument : typeArguments)
>+        result.append(clone(typeArgument));
>+    return result;
>+}
>+
>+TypeArgument clone(const TypeArgument& typeArgument)
>+{
>+    return WTF::visit(WTF::makeVisitor([](const ConstantExpression& constantExpression) -> TypeArgument {
>+        return constantExpression.clone();
>+    }, [](const UniqueRef<TypeReference>& typeReference) -> TypeArgument {
>+        return typeReference->cloneTypeReference();
>+    }), typeArgument);
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..0e6709d7adb97bfd403d22e14981bdb7b4441d95
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.h
>@@ -0,0 +1,56 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLConstantExpression.h"
>+#include "WHLSLLexer.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/Variant.h>
>+#include <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class TypeReference;
>+
>+using TypeArgument = Variant<ConstantExpression, UniqueRef<TypeReference>>;
>+using TypeArguments = Vector<TypeArgument>;
>+
>+TypeArgument clone(const TypeArgument&);
>+TypeArguments clone(const TypeArguments&);
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeDefinition.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeDefinition.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..2e3ff364d6bd6063052fc3af1b5fc46f31ef64ef
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeDefinition.h
>@@ -0,0 +1,82 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNamedType.h"
>+#include "WHLSLNode.h"
>+#include "WHLSLUnnamedType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class TypeDefinition : public NamedType {
>+public:
>+    TypeDefinition(Lexer::Token&& origin, String&& name, UniqueRef<UnnamedType>&& type)
>+        : NamedType(WTFMove(origin), WTFMove(name))
>+        , m_type(WTFMove(type))
>+    {
>+    }
>+
>+    virtual ~TypeDefinition() = default;
>+
>+    TypeDefinition(const TypeDefinition&) = delete;
>+    TypeDefinition(TypeDefinition&&) = default;
>+
>+    bool isTypeDefinition() const override { return true; }
>+
>+    UnnamedType& type() { return static_cast<UnnamedType&>(m_type); }
>+
>+    const Type& unifyNode() const override
>+    {
>+        return m_type->unifyNode();
>+    }
>+
>+    Type& unifyNode() override
>+    {
>+        return m_type->unifyNode();
>+    }
>+
>+private:
>+    UniqueRef<UnnamedType> m_type;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_NAMED_TYPE(TypeDefinition, isTypeDefinition())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeReference.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeReference.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..a2d8fe452af4b8bae5d6139f19a7faa10d310248
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeReference.cpp
>@@ -0,0 +1,56 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLTypeReference.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLNativeTypeDeclaration.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+UniqueRef<TypeReference> TypeReference::wrap(Lexer::Token&& origin, NamedType& resolvedType)
>+{
>+    TypeArguments typeArguments;
>+    if (is<NativeTypeDeclaration>(resolvedType))
>+        typeArguments = AST::clone(downcast<NativeTypeDeclaration>(resolvedType).typeArguments());
>+    auto result = makeUniqueRef<TypeReference>(WTFMove(origin), String(resolvedType.name()), WTFMove(typeArguments));
>+    result->setResolvedType(resolvedType);
>+    return result;
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeReference.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeReference.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..bb69f036df4ae2343dbe507d87aa5990bb7163c8
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLTypeReference.h
>@@ -0,0 +1,108 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNamedType.h"
>+#include "WHLSLTypeArgument.h"
>+#include "WHLSLUnnamedType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class NamedType;
>+
>+class TypeReference : public UnnamedType {
>+public:
>+    TypeReference(Lexer::Token&& origin, String&& name, TypeArguments&& typeArguments)
>+        : UnnamedType(WTFMove(origin))
>+        , m_name(WTFMove(name))
>+        , m_typeArguments(WTFMove(typeArguments))
>+    {
>+    }
>+
>+    virtual ~TypeReference() = default;
>+
>+    TypeReference(const TypeReference&) = delete;
>+    TypeReference(TypeReference&&) = default;
>+
>+    static UniqueRef<TypeReference> wrap(Lexer::Token&& origin, NamedType& resolvedType);
>+
>+    bool isTypeReference() const override { return true; }
>+
>+    String& name() { return m_name; }
>+    TypeArguments& typeArguments() { return m_typeArguments; }
>+    NamedType* resolvedType() const { return m_resolvedType; }
>+
>+    const Type& unifyNode() const override
>+    {
>+        ASSERT(m_resolvedType);
>+        return m_resolvedType->unifyNode();
>+    }
>+
>+    Type& unifyNode() override
>+    {
>+        ASSERT(m_resolvedType);
>+        return m_resolvedType->unifyNode();
>+    }
>+
>+    void setResolvedType(NamedType& resolvedType)
>+    {
>+        m_resolvedType = &resolvedType;
>+    }
>+
>+    UniqueRef<TypeReference> cloneTypeReference() const
>+    {
>+        return makeUniqueRef<TypeReference>(Lexer::Token(origin()), String(m_name), AST::clone(m_typeArguments));
>+    }
>+
>+    UniqueRef<UnnamedType> clone() const override
>+    {
>+        return cloneTypeReference();
>+    }
>+
>+private:
>+    String m_name;
>+    TypeArguments m_typeArguments;
>+    NamedType* m_resolvedType { nullptr };
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_UNNAMED_TYPE(TypeReference, isTypeReference())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnnamedType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnnamedType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..8c7c5174da509275396746e6e6e2251f37e7ac0f
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnnamedType.h
>@@ -0,0 +1,85 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLNode.h"
>+#include "WHLSLType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class UnnamedType : public Type {
>+public:
>+    UnnamedType(Lexer::Token&& origin)
>+        : m_origin(WTFMove(origin))
>+    {
>+    }
>+
>+    virtual ~UnnamedType() = default;
>+
>+    UnnamedType(const UnnamedType&) = delete;
>+    UnnamedType(UnnamedType&&) = default;
>+
>+    bool isUnnamedType() const override { return true; }
>+    virtual bool isTypeReference() const { return false; }
>+    virtual bool isPointerType() const { return false; }
>+    virtual bool isArrayReferenceType() const { return false; }
>+    virtual bool isArrayType() const { return false; }
>+    virtual bool isReferenceType() const { return false; }
>+
>+    virtual const Type& unifyNode() const { return *this; }
>+    virtual Type& unifyNode() { return *this; }
>+
>+    virtual UniqueRef<UnnamedType> clone() const = 0;
>+
>+    const Lexer::Token& origin() const { return m_origin; }
>+
>+private:
>+    Lexer::Token m_origin;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#define SPECIALIZE_TYPE_TRAITS_WHLSL_UNNAMED_TYPE(ToValueTypeName, predicate) \
>+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::WHLSL::AST::ToValueTypeName) \
>+    static bool isType(const WebCore::WHLSL::AST::UnnamedType& type) { return type.predicate; } \
>+SPECIALIZE_TYPE_TRAITS_END()
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_TYPE(UnnamedType, isUnnamedType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..c8f5419173820ea29e12bfdfcf98ccd28bb11ec0
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.cpp
>@@ -0,0 +1,55 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLUnsignedIntegerLiteral.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLNativeTypeDeclaration.h"
>+#include "WHLSLTypeReference.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+int64_t UnsignedIntegerLiteral::valueForSelectedType() const
>+{
>+    ASSERT(m_type.resolvedType());
>+    auto& typeReference = downcast<TypeReference>(*m_type.resolvedType());
>+    ASSERT(typeReference.resolvedType());
>+    auto& nativeTypeDeclaration = downcast<NativeTypeDeclaration>(*typeReference.resolvedType());
>+    return nativeTypeDeclaration.formatValueFromUnsignedInteger()(m_value);
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..47b9e25b6090a6784e1ed24aeea7abcfe5f907f6
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.h
>@@ -0,0 +1,85 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLUnsignedIntegerLiteralType.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class UnsignedIntegerLiteral : public Expression {
>+public:
>+    UnsignedIntegerLiteral(Lexer::Token&& origin, unsigned value)
>+        : Expression(Lexer::Token(origin))
>+        , m_type(WTFMove(origin), value)
>+        , m_value(value)
>+    {
>+    }
>+
>+    virtual ~UnsignedIntegerLiteral() = default;
>+
>+    UnsignedIntegerLiteral(const UnsignedIntegerLiteral&) = delete;
>+    UnsignedIntegerLiteral(UnsignedIntegerLiteral&&) = default;
>+
>+    UnsignedIntegerLiteral& operator=(const UnsignedIntegerLiteral&) = delete;
>+    UnsignedIntegerLiteral& operator=(UnsignedIntegerLiteral&&) = default;
>+
>+    UnsignedIntegerLiteralType& type() { return m_type; }
>+    unsigned value() const { return m_value; }
>+
>+    bool isUnsignedIntegerLiteral() const override { return true; }
>+
>+    UnsignedIntegerLiteral clone() const
>+    {
>+        UnsignedIntegerLiteral result(Lexer::Token(origin()), m_value);
>+        if (result.m_type.resolvedType())
>+            result.m_type.resolve(result.m_type.resolvedType()->clone());
>+        return result;
>+    }
>+
>+    int64_t valueForSelectedType() const;
>+
>+private:
>+    UnsignedIntegerLiteralType m_type;
>+    unsigned m_value;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(UnsignedIntegerLiteral, isUnsignedIntegerLiteral())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.cpp b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..eedacf6a6b864f135afb8b6c5df3e63939cf8238
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.cpp
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLUnsignedIntegerLiteralType.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+UnsignedIntegerLiteralType::UnsignedIntegerLiteralType(Lexer::Token&& origin, unsigned value)
>+    : m_value(value)
>+    , m_preferredType(makeUniqueRef<TypeReference>(WTFMove(origin), String("uint", String::ConstructFromLiteral), TypeArguments()))
>+{
>+}
>+
>+UnsignedIntegerLiteralType::~UnsignedIntegerLiteralType() = default;
>+
>+bool UnsignedIntegerLiteralType::canResolve(const Type&) const
>+{
>+    // FIXME: Implement this
>+    return true;
>+}
>+
>+unsigned UnsignedIntegerLiteralType::conversionCost(const UnnamedType&) const
>+{
>+    // FIXME: Implement this
>+    return 0;
>+}
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..52a3b777a45f8bcd5b18787cad17cd66eddbea8a
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.h
>@@ -0,0 +1,78 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLResolvableType.h"
>+#include <wtf/UniqueRef.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class TypeReference;
>+
>+class UnsignedIntegerLiteralType : public ResolvableType {
>+public:
>+    UnsignedIntegerLiteralType(Lexer::Token&& origin, unsigned value);
>+
>+    virtual ~UnsignedIntegerLiteralType();
>+
>+    UnsignedIntegerLiteralType(const UnsignedIntegerLiteralType&) = delete;
>+    UnsignedIntegerLiteralType(UnsignedIntegerLiteralType&&) = default;
>+
>+    UnsignedIntegerLiteralType& operator=(const UnsignedIntegerLiteralType&) = delete;
>+    UnsignedIntegerLiteralType& operator=(UnsignedIntegerLiteralType&&) = default;
>+
>+    bool isUnsignedIntegerLiteralType() const override { return true; }
>+
>+    TypeReference& preferredType() { return static_cast<TypeReference&>(m_preferredType); }
>+
>+    bool canResolve(const Type&) const override;
>+    unsigned conversionCost(const UnnamedType&) const override;
>+
>+    unsigned value() const { return m_value; }
>+
>+private:
>+    unsigned m_value;
>+    // This is a unique_ptr to resolve a circular dependency between
>+    // ConstantExpression -> LiteralType -> TypeReference -> TypeArguments -> ConstantExpression
>+    UniqueRef<TypeReference> m_preferredType;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_RESOLVABLE_TYPE(UnsignedIntegerLiteralType, isUnsignedIntegerLiteralType())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLValue.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLValue.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ffd9c8ef723f5a257bb27fc674d0a3f350e47ea6
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLValue.h
>@@ -0,0 +1,61 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLNode.h"
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class Value : public Node {
>+public:
>+    Value()
>+    {
>+    }
>+
>+    virtual ~Value() = default;
>+
>+    explicit Value(const Value&) = default;
>+    Value(Value&&) = default;
>+
>+    Value& operator=(const Value&) = default;
>+    Value& operator=(Value&&) = default;
>+
>+private:
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..b4494602cfbaab1135d7162356a0a20870122ebe
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclaration.h
>@@ -0,0 +1,89 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLQualifier.h"
>+#include "WHLSLSemantic.h"
>+#include "WHLSLType.h"
>+#include "WHLSLValue.h"
>+#include <memory>
>+#include <wtf/UniqueRef.h>
>+#include <wtf/Vector.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class VariableDeclaration : public Value {
>+public:
>+    VariableDeclaration(Lexer::Token&& origin, Qualifiers&& qualifiers, Optional<UniqueRef<UnnamedType>>&& type, String&& name, Optional<Semantic>&& semantic, Optional<UniqueRef<Expression>>&& initializer)
>+        : m_origin(WTFMove(origin))
>+        , m_qualifiers(WTFMove(qualifiers))
>+        , m_type(WTFMove(type))
>+        , m_name(WTFMove(name))
>+        , m_semantic(WTFMove(semantic))
>+        , m_initializer(WTFMove(initializer))
>+    {
>+    }
>+
>+    virtual ~VariableDeclaration() = default;
>+
>+    VariableDeclaration(const VariableDeclaration&) = delete;
>+    VariableDeclaration(VariableDeclaration&&) = default;
>+
>+    const Lexer::Token& origin() const { return m_origin; }
>+    String& name() { return m_name; }
>+
>+    const Optional<UniqueRef<UnnamedType>>& type() const { return m_type; } // Anonymous variables inside ReadModifyWriteExpressions have their type set by the type checker.
>+    UnnamedType* type() { return m_type ? &static_cast<UnnamedType&>(*m_type) : nullptr; }
>+    Optional<Semantic>& semantic() { return m_semantic; }
>+    Expression* initializer() { return m_initializer ? &static_cast<Expression&>(*m_initializer) : nullptr; }
>+
>+private:
>+    Lexer::Token m_origin;
>+    Qualifiers m_qualifiers;
>+    Optional<UniqueRef<UnnamedType>> m_type;
>+    String m_name;
>+    Optional<Semantic> m_semantic;
>+    Optional<UniqueRef<Expression>> m_initializer;
>+};
>+
>+using VariableDeclarations = Vector<VariableDeclaration>;
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclarationsStatement.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclarationsStatement.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..e8e1fc7f5b238dbb0403e9f4027804a70a7e881c
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableDeclarationsStatement.h
>@@ -0,0 +1,70 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include "WHLSLVariableDeclaration.h"
>+#include <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class VariableDeclarationsStatement : public Statement {
>+public:
>+    VariableDeclarationsStatement(Lexer::Token&& origin, Vector<VariableDeclaration>&& variableDeclarations)
>+        : Statement(WTFMove(origin))
>+        , m_variableDeclarations(WTFMove(variableDeclarations))
>+    {
>+    }
>+
>+    virtual ~VariableDeclarationsStatement() = default;
>+
>+    VariableDeclarationsStatement(const VariableDeclarationsStatement&) = delete;
>+    VariableDeclarationsStatement(VariableDeclarationsStatement&&) = default;
>+
>+    bool isVariableDeclarationsStatement() const override { return true; }
>+
>+    Vector<VariableDeclaration>& variableDeclarations() { return m_variableDeclarations; }
>+
>+private:
>+    Vector<VariableDeclaration> m_variableDeclarations;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(VariableDeclarationsStatement, isVariableDeclarationsStatement())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableReference.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableReference.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..5052fdf1e47cbd51cc69bb55946464f43d3dfc74
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLVariableReference.h
>@@ -0,0 +1,90 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLVariableDeclaration.h"
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class VariableReference : public Expression {
>+public:
>+    VariableReference(Lexer::Token&& origin, String&& name)
>+        : Expression(WTFMove(origin))
>+        , m_name(WTFMove(name))
>+    {
>+    }
>+
>+    virtual ~VariableReference() = default;
>+
>+    VariableReference(const VariableReference&) = delete;
>+    VariableReference(VariableReference&&) = default;
>+
>+    static VariableReference wrap(VariableDeclaration& variableDeclaration)
>+    {
>+        VariableReference result(Lexer::Token(variableDeclaration.origin()));
>+        result.m_variable = &variableDeclaration;
>+        return result;
>+    }
>+
>+    bool isVariableReference() const override { return true; }
>+
>+    String& name() { return m_name; }
>+
>+    VariableDeclaration* variable() { return m_variable; }
>+
>+    void setVariable(VariableDeclaration& variableDeclaration)
>+    {
>+        m_variable = &variableDeclaration;
>+    }
>+
>+private:
>+    VariableReference(Lexer::Token&& origin)
>+        : Expression(WTFMove(origin))
>+    {
>+    }
>+
>+    String m_name;
>+    VariableDeclaration* m_variable;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_EXPRESSION(VariableReference, isVariableReference())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLWhileLoop.h b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLWhileLoop.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..a7e8682af9de20c62e45ae031ad21084d41fc9be
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/AST/WHLSLWhileLoop.h
>@@ -0,0 +1,73 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLExpression.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLStatement.h"
>+#include <wtf/UniqueRef.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+namespace AST {
>+
>+class WhileLoop : public Statement {
>+public:
>+    WhileLoop(Lexer::Token&& origin, UniqueRef<Expression>&& conditional, UniqueRef<Statement>&& body)
>+        : Statement(WTFMove(origin))
>+        , m_conditional(WTFMove(conditional))
>+        , m_body(WTFMove(body))
>+    {
>+    }
>+
>+    virtual ~WhileLoop() = default;
>+
>+    WhileLoop(const WhileLoop&) = delete;
>+    WhileLoop(WhileLoop&&) = default;
>+
>+    bool isWhileLoop() const override { return true; }
>+
>+    Expression& conditional() { return static_cast<Expression&>(m_conditional); }
>+    Statement& body() { return static_cast<Statement&>(m_body); }
>+
>+private:
>+    UniqueRef<Expression> m_conditional;
>+    UniqueRef<Statement> m_body;
>+};
>+
>+} // namespace AST
>+
>+}
>+
>+}
>+
>+SPECIALIZE_TYPE_TRAITS_WHLSL_STATEMENT(WhileLoop, isWhileLoop())
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/WHLSLLexer.cpp b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLLexer.cpp
>index 3b1934e931654924e1e4c8def59f748d21204a53..e9aeae7b542238e9836a54807da1f01175b28902 100644
>--- a/Source/WebCore/Modules/webgpu/WHLSL/WHLSLLexer.cpp
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLLexer.cpp
>@@ -23,8 +23,6 @@
>  * THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
>-#pragma once
>-
> #include "config.h"
> #include "WHLSLLexer.h"
> 
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/WHLSLParser.cpp b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLParser.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..b2d790577a414d6094ca0a81492effbb68bc1b8f
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLParser.cpp
>@@ -0,0 +1,41 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "WHLSLParser.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#include <wtf/text/StringBuilder.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/WHLSLParser.h b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLParser.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..3cf66ced220f632a97c3a41e9d895fd5f12baf3c
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLParser.h
>@@ -0,0 +1,113 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLArrayReferenceType.h"
>+#include "WHLSLArrayType.h"
>+#include "WHLSLAssignmentExpression.h"
>+#include "WHLSLBaseFunctionAttribute.h"
>+#include "WHLSLBaseSemantic.h"
>+#include "WHLSLBlock.h"
>+#include "WHLSLBooleanLiteral.h"
>+#include "WHLSLBreak.h"
>+#include "WHLSLBuiltInSemantic.h"
>+#include "WHLSLCallExpression.h"
>+#include "WHLSLCommaExpression.h"
>+#include "WHLSLConstantExpression.h"
>+#include "WHLSLConstantExpressionEnumerationMemberReference.h"
>+#include "WHLSLContinue.h"
>+#include "WHLSLDereferenceExpression.h"
>+#include "WHLSLDoWhileLoop.h"
>+#include "WHLSLDotExpression.h"
>+#include "WHLSLEffectfulExpressionStatement.h"
>+#include "WHLSLEnumerationDefinition.h"
>+#include "WHLSLEnumerationMember.h"
>+#include "WHLSLExpression.h"
>+#include "WHLSLFallthrough.h"
>+#include "WHLSLFloatLiteral.h"
>+#include "WHLSLForLoop.h"
>+#include "WHLSLFunctionAttribute.h"
>+#include "WHLSLFunctionDeclaration.h"
>+#include "WHLSLFunctionDefinition.h"
>+#include "WHLSLIfStatement.h"
>+#include "WHLSLIndexExpression.h"
>+#include "WHLSLIntegerLiteral.h"
>+#include "WHLSLLexer.h"
>+#include "WHLSLLogicalExpression.h"
>+#include "WHLSLLogicalNotExpression.h"
>+#include "WHLSLMakeArrayReferenceExpression.h"
>+#include "WHLSLMakePointerExpression.h"
>+#include "WHLSLNativeFunctionDeclaration.h"
>+#include "WHLSLNativeTypeDeclaration.h"
>+#include "WHLSLNode.h"
>+#include "WHLSLNullLiteral.h"
>+#include "WHLSLNumThreadsFunctionAttribute.h"
>+#include "WHLSLPointerType.h"
>+#include "WHLSLProgram.h"
>+#include "WHLSLPropertyAccessExpression.h"
>+#include "WHLSLQualifier.h"
>+#include "WHLSLReadModifyWriteExpression.h"
>+#include "WHLSLReferenceType.h"
>+#include "WHLSLResourceSemantic.h"
>+#include "WHLSLReturn.h"
>+#include "WHLSLSemantic.h"
>+#include "WHLSLSpecializationConstantSemantic.h"
>+#include "WHLSLStageInOutSemantic.h"
>+#include "WHLSLStatement.h"
>+#include "WHLSLStructureDefinition.h"
>+#include "WHLSLStructureElement.h"
>+#include "WHLSLSwitchCase.h"
>+#include "WHLSLSwitchStatement.h"
>+#include "WHLSLTernaryExpression.h"
>+#include "WHLSLTrap.h"
>+#include "WHLSLType.h"
>+#include "WHLSLTypeArgument.h"
>+#include "WHLSLTypeDefinition.h"
>+#include "WHLSLTypeReference.h"
>+#include "WHLSLUnsignedIntegerLiteral.h"
>+#include "WHLSLValue.h"
>+#include "WHLSLVariableDeclaration.h"
>+#include "WHLSLVariableDeclarationsStatement.h"
>+#include "WHLSLVariableReference.h"
>+#include "WHLSLWhileLoop.h"
>+#include <wtf/Expected.h>
>+#include <wtf/Optional.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+class Parser {
>+
>+};
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Modules/webgpu/WHLSL/WHLSLProgram.h b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLProgram.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..a69e843c10fd7cca319553750227aabeccfda79b
>--- /dev/null
>+++ b/Source/WebCore/Modules/webgpu/WHLSL/WHLSLProgram.h
>@@ -0,0 +1,105 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(WEBGPU)
>+
>+#include "WHLSLEnumerationDefinition.h"
>+#include "WHLSLFunctionDefinition.h"
>+#include "WHLSLNativeFunctionDeclaration.h"
>+#include "WHLSLNativeTypeDeclaration.h"
>+#include "WHLSLStructureDefinition.h"
>+#include "WHLSLTypeDefinition.h"
>+#include <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+namespace WHLSL {
>+
>+class Program {
>+public:
>+    Program() = default;
>+    Program(Program&&) = default;
>+
>+    bool append(AST::TypeDefinition&& typeDefinition)
>+    {
>+        m_typeDefinitions.append(makeUniqueRef<AST::TypeDefinition>(WTFMove(typeDefinition)));
>+        return true;
>+    }
>+
>+    bool append(AST::StructureDefinition&& structureDefinition)
>+    {
>+        m_structureDefinitions.append(makeUniqueRef<AST::StructureDefinition>(WTFMove(structureDefinition)));
>+        return true;
>+    }
>+
>+    bool append(AST::EnumerationDefinition&& enumerationDefinition)
>+    {
>+        m_enumerationDefinitions.append(makeUniqueRef<AST::EnumerationDefinition>(WTFMove(enumerationDefinition)));
>+        return true;
>+    }
>+
>+    bool append(AST::FunctionDefinition&& functionDefinition)
>+    {
>+        m_functionDefinitions.append(makeUniqueRef<AST::FunctionDefinition>(WTFMove(functionDefinition)));
>+        return true;
>+    }
>+
>+    bool append(AST::NativeFunctionDeclaration&& nativeFunctionDeclaration)
>+    {
>+        m_nativeFunctionDeclarations.append(makeUniqueRef<AST::NativeFunctionDeclaration>(WTFMove(nativeFunctionDeclaration)));
>+        return true;
>+    }
>+
>+    bool append(AST::NativeTypeDeclaration&& nativeTypeDeclaration)
>+    {
>+        m_nativeTypeDeclarations.append(makeUniqueRef<AST::NativeTypeDeclaration>(WTFMove(nativeTypeDeclaration)));
>+        return true;
>+    }
>+
>+    Vector<UniqueRef<AST::TypeDefinition>>& typeDefinitions() { return m_typeDefinitions; }
>+    Vector<UniqueRef<AST::StructureDefinition>>& structureDefinitions() { return m_structureDefinitions; }
>+    Vector<UniqueRef<AST::EnumerationDefinition>>& enumerationDefinitions() { return m_enumerationDefinitions; }
>+    const Vector<UniqueRef<AST::FunctionDefinition>>& functionDefinitions() const { return m_functionDefinitions; }
>+    Vector<UniqueRef<AST::FunctionDefinition>>& functionDefinitions() { return m_functionDefinitions; }
>+    const Vector<UniqueRef<AST::NativeFunctionDeclaration>>& nativeFunctionDeclarations() const { return m_nativeFunctionDeclarations; }
>+    Vector<UniqueRef<AST::NativeFunctionDeclaration>>& nativeFunctionDeclarations() { return m_nativeFunctionDeclarations; }
>+    Vector<UniqueRef<AST::NativeTypeDeclaration>>& nativeTypeDeclarations() { return m_nativeTypeDeclarations; }
>+
>+private:
>+    Vector<UniqueRef<AST::TypeDefinition>> m_typeDefinitions;
>+    Vector<UniqueRef<AST::StructureDefinition>> m_structureDefinitions;
>+    Vector<UniqueRef<AST::EnumerationDefinition>> m_enumerationDefinitions;
>+    Vector<UniqueRef<AST::FunctionDefinition>> m_functionDefinitions;
>+    Vector<UniqueRef<AST::NativeFunctionDeclaration>> m_nativeFunctionDeclarations;
>+    Vector<UniqueRef<AST::NativeTypeDeclaration>> m_nativeTypeDeclarations;
>+};
>+
>+}
>+
>+}
>+
>+#endif
>diff --git a/Source/WebCore/Sources.txt b/Source/WebCore/Sources.txt
>index e7d934ad27f1bfa91231e1d86df0b7419d838b90..12e30eb3012963f8c1215abd64fc543b44fe4a53 100644
>--- a/Source/WebCore/Sources.txt
>+++ b/Source/WebCore/Sources.txt
>@@ -304,6 +304,19 @@ Modules/websockets/WorkerThreadableWebSocketChannel.cpp
> 
> Modules/webgpu/DOMWindowWebGPU.cpp
> Modules/webgpu/WHLSL/WHLSLLexer.cpp
>+Modules/webgpu/WHLSL/WHLSLParser.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLTypeArgument.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLBuiltInSemantic.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLResourceSemantic.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLSpecializationConstantSemantic.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLStageInOutSemantic.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLFloatLiteralType.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteralType.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLNullLiteralType.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteralType.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLTypeReference.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLIntegerLiteral.cpp
>+Modules/webgpu/WHLSL/AST/WHLSLUnsignedIntegerLiteral.cpp
> Modules/webgpu/WebGPU.cpp
> Modules/webgpu/WebGPUAdapter.cpp
> Modules/webgpu/WebGPUBindGroupLayout.cpp
>diff --git a/Source/WebCore/WebCore.xcodeproj/project.pbxproj b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>index de452c062a6ba26f47327077fc1f99acfcfd8ceb..ae36edd35bf52def3ea0bcaf90943ce98a06127d 100644
>--- a/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>+++ b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>@@ -6403,6 +6403,9 @@
> 		1C24EEA71C72A7B40080F8FC /* JSFontFaceSet.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = JSFontFaceSet.h; path = DerivedSources/WebCore/JSFontFaceSet.h; sourceTree = BUILT_PRODUCTS_DIR; };
> 		1C2649790D7E248A00BD10F2 /* DocumentLoaderMac.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = DocumentLoaderMac.cpp; sourceTree = "<group>"; };
> 		1C3249101C6D6A3B007EDB32 /* FontVariantBuilder.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = FontVariantBuilder.cpp; sourceTree = "<group>"; };
>+		1C33276C21CEDA42000DC9F2 /* WHLSLEnumerationMemberLiteral.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = WHLSLEnumerationMemberLiteral.h; sourceTree = "<group>"; };
>+		1C33277121CF0BE1000DC9F2 /* WHLSLNamedType.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = WHLSLNamedType.h; sourceTree = "<group>"; };
>+		1C33277221CF0D2E000DC9F2 /* WHLSLUnnamedType.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = WHLSLUnnamedType.h; sourceTree = "<group>"; };
> 		1C3969CF1B74211E002BCFA7 /* FontCacheCoreText.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = FontCacheCoreText.cpp; sourceTree = "<group>"; };
> 		1C66260E1C6E7CA600AB527C /* FontFace.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = FontFace.cpp; sourceTree = "<group>"; };
> 		1C66260F1C6E7CA600AB527C /* FontFace.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = FontFace.h; sourceTree = "<group>"; };
>@@ -6415,6 +6418,15 @@
> 		1CAF347E0A6C405200ABE06E /* WebScriptObject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebScriptObject.h; sourceTree = "<group>"; };
> 		1CAF347F0A6C405200ABE06E /* WebScriptObject.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = WebScriptObject.mm; sourceTree = "<group>"; };
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>@@ -13215,8 +13227,84 @@
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> 		C21DF2E71D9E4E9900F5B24C /* CSSFontVariationValue.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = CSSFontVariationValue.cpp; sourceTree = "<group>"; };
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>@@ -13226,6 +13314,7 @@
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>@@ -25245,12 +25334,109 @@
> 		C210E90D21B4BCA400B7F83D /* WHLSL */ = {
> 			isa = PBXGroup;
> 			children = (
>+				C21BF6F121CD898D00227979 /* AST */,
> 				C210E91121B4BD1000B7F83D /* WHLSLLexer.cpp */,
> 				C210E91221B4BD1000B7F83D /* WHLSLLexer.h */,
>+				C21BF73721CD8A0200227979 /* WHLSLParser.cpp */,
>+				C21BF73821CD8A0300227979 /* WHLSLParser.h */,
>+				C21BF73A21CD8D7000227979 /* WHLSLProgram.h */,
> 			);
> 			path = WHLSL;
> 			sourceTree = "<group>";
> 		};
>+		C21BF6F121CD898D00227979 /* AST */ = {
>+			isa = PBXGroup;
>+			children = (
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>+				C21BF70921CD89CA00227979 /* WHLSLArrayType.h */,
>+				C21BF73021CD89ED00227979 /* WHLSLAssignmentExpression.h */,
>+				C21BF70A21CD89CB00227979 /* WHLSLBaseFunctionAttribute.h */,
>+				C21BF6FA21CD89BE00227979 /* WHLSLBaseSemantic.h */,
>+				C21BF71E21CD89DC00227979 /* WHLSLBlock.h */,
>+				C21BF6F621CD89B700227979 /* WHLSLBooleanLiteral.h */,
>+				C21BF71A21CD89D800227979 /* WHLSLBreak.h */,
>+				C2138A1321DDECD300F516BA /* WHLSLBuiltInSemantic.cpp */,
>+				C21BF72221CD89DF00227979 /* WHLSLBuiltInSemantic.h */,
>+				C21BF71621CD89D500227979 /* WHLSLCallExpression.h */,
>+				C21BF70621CD89C700227979 /* WHLSLCommaExpression.h */,
>+				C21BF73321CD89F000227979 /* WHLSLConstantExpression.h */,
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>+				C21BF6F521CD89B500227979 /* WHLSLContinue.h */,
>+				C21BF70121CD89C400227979 /* WHLSLDereferenceExpression.h */,
>+				C21BF71821CD89D700227979 /* WHLSLDotExpression.h */,
>+				C21BF6FB21CD89BE00227979 /* WHLSLDoWhileLoop.h */,
>+				C21BF72821CD89E500227979 /* WHLSLEffectfulExpressionStatement.h */,
>+				C21BF72021CD89DD00227979 /* WHLSLEnumerationDefinition.h */,
>+				C21BF72621CD89E300227979 /* WHLSLEnumerationMember.h */,
>+				1C33276C21CEDA42000DC9F2 /* WHLSLEnumerationMemberLiteral.h */,
>+				C21BF70C21CD89CC00227979 /* WHLSLExpression.h */,
>+				C21BF70021CD89C200227979 /* WHLSLFallthrough.h */,
>+				C21BF73521CD89F200227979 /* WHLSLFloatLiteral.h */,
>+				1CB69B3821DF03E1006E846A /* WHLSLFloatLiteralType.cpp */,
>+				1CB69B3421DED63A006E846A /* WHLSLFloatLiteralType.h */,
>+				C21BF73421CD89F100227979 /* WHLSLForLoop.h */,
>+				C21BF70521CD89C700227979 /* WHLSLFunctionAttribute.h */,
>+				C21BF6FD21CD89C000227979 /* WHLSLFunctionDeclaration.h */,
>+				C21BF6F421CD89B300227979 /* WHLSLFunctionDefinition.h */,
>+				C21BF6FF21CD89C200227979 /* WHLSLIfStatement.h */,
>+				C21BF6F721CD89B900227979 /* WHLSLIndexExpression.h */,
>+				C20F4F6621DFF2360070C45A /* WHLSLIntegerLiteral.cpp */,
>+				C21BF6F821CD89BB00227979 /* WHLSLIntegerLiteral.h */,
>+				1CB69B3921DF03F3006E846A /* WHLSLIntegerLiteralType.cpp */,
>+				1CB69B3521DED649006E846A /* WHLSLIntegerLiteralType.h */,
>+				C21BF73221CD89EF00227979 /* WHLSLLogicalExpression.h */,
>+				C21BF71521CD89D400227979 /* WHLSLLogicalNotExpression.h */,
>+				C21BF72D21CD89E900227979 /* WHLSLMakeArrayReferenceExpression.h */,
>+				C21BF72C21CD89E900227979 /* WHLSLMakePointerExpression.h */,
>+				1C33277121CF0BE1000DC9F2 /* WHLSLNamedType.h */,
>+				C21BF72321CD89E100227979 /* WHLSLNativeFunctionDeclaration.h */,
>+				C21BF72A21CD89E700227979 /* WHLSLNativeTypeDeclaration.h */,
>+				C21BF72421CD89E100227979 /* WHLSLNode.h */,
>+				C21BF70721CD89C800227979 /* WHLSLNullLiteral.h */,
>+				1CB69B3A21DF0403006E846A /* WHLSLNullLiteralType.cpp */,
>+				1CB69B3621DED657006E846A /* WHLSLNullLiteralType.h */,
>+				C21BF72121CD89DE00227979 /* WHLSLNumThreadsFunctionAttribute.h */,
>+				C21BF72F21CD89EC00227979 /* WHLSLPointerType.h */,
>+				C21BF72E21CD89EA00227979 /* WHLSLPropertyAccessExpression.h */,
>+				C21BF70B21CD89CC00227979 /* WHLSLQualifier.h */,
>+				C21BF71B21CD89D900227979 /* WHLSLReadModifyWriteExpression.h */,
>+				C21BF70D21CD89CD00227979 /* WHLSLReferenceType.h */,
>+				1CB69B3221DED40B006E846A /* WHLSLResolvableType.h */,
>+				C2138A1521DDECE900F516BA /* WHLSLResourceSemantic.cpp */,
>+				C21BF70821CD89C900227979 /* WHLSLResourceSemantic.h */,
>+				C21BF70321CD89C500227979 /* WHLSLReturn.h */,
>+				C21BF6F921CD89BD00227979 /* WHLSLSemantic.h */,
>+				C2138A1621DDECFB00F516BA /* WHLSLSpecializationConstantSemantic.cpp */,
>+				C21BF73621CD89F300227979 /* WHLSLSpecializationConstantSemantic.h */,
>+				C2138A1721DDED0D00F516BA /* WHLSLStageInOutSemantic.cpp */,
>+				C21BF70E21CD89CE00227979 /* WHLSLStageInOutSemantic.h */,
>+				C21BF71221CD89D100227979 /* WHLSLStatement.h */,
>+				C21BF72721CD89E400227979 /* WHLSLStructureDefinition.h */,
>+				C21BF6FE21CD89C100227979 /* WHLSLStructureElement.h */,
>+				C21BF71921CD89D700227979 /* WHLSLSwitchCase.h */,
>+				C21BF73121CD89EE00227979 /* WHLSLSwitchStatement.h */,
>+				C21BF71C21CD89DA00227979 /* WHLSLTernaryExpression.h */,
>+				C21BF6F321CD89AD00227979 /* WHLSLTrap.h */,
>+				C21BF71D21CD89DB00227979 /* WHLSLType.h */,
>+				C288C72D21C991DA002DF5CA /* WHLSLTypeArgument.cpp */,
>+				C21BF71121CD89D100227979 /* WHLSLTypeArgument.h */,
>+				C21BF72921CD89E600227979 /* WHLSLTypeDefinition.h */,
>+				C20F4F6421DFBE5C0070C45A /* WHLSLTypeReference.cpp */,
>+				C21BF71F21CD89DC00227979 /* WHLSLTypeReference.h */,
>+				1C33277221CF0D2E000DC9F2 /* WHLSLUnnamedType.h */,
>+				C20F4F6721DFF3A70070C45A /* WHLSLUnsignedIntegerLiteral.cpp */,
>+				C21BF72B21CD89E800227979 /* WHLSLUnsignedIntegerLiteral.h */,
>+				1CB69B3B21DF041E006E846A /* WHLSLUnsignedIntegerLiteralType.cpp */,
>+				1CB69B3721DED66B006E846A /* WHLSLUnsignedIntegerLiteralType.h */,
>+				C21BF6FC21CD89BF00227979 /* WHLSLValue.h */,
>+				C21BF71021CD89D000227979 /* WHLSLVariableDeclaration.h */,
>+				C21BF71421CD89D300227979 /* WHLSLVariableDeclarationsStatement.h */,
>+				C21BF71321CD89D200227979 /* WHLSLVariableReference.h */,
>+				C21BF70421CD89C600227979 /* WHLSLWhileLoop.h */,
>+			);
>+			path = AST;
>+			sourceTree = "<group>";
>+		};
> 		C96F5EBF1B5872260091EA9D /* mediasession */ = {
> 			isa = PBXGroup;
> 			children = (

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Attachments on bug 192991: 357967 | 357972 | 357974 | 358721 | 358780 | 358820