Attachment 359666 Details for Bug 193640 – patch for landing

[patch] patch for landing

a-backup.diff (text/plain), 132.52 KB, created by Saam Barati on 2019-01-20 19:58:35 PST

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Creator: Saam Barati

Created: 2019-01-20 19:58:35 PST

Size: 132.52 KB

patch

obsolete

>Index: Source/JavaScriptCore/ChangeLog
>===================================================================
>--- Source/JavaScriptCore/ChangeLog	(revision 240220)
>+++ Source/JavaScriptCore/ChangeLog	(working copy)
>@@ -1,3 +1,254 @@
>+2019-01-20  Saam Barati  <sbarati@apple.com>
>+
>+        Rollout r240210: It broke tests on iOS
>+        https://bugs.webkit.org/show_bug.cgi?id=193640
>+
>+        Unreviewed. ~2650 tests are failing on iOS.
>+
>+        * CMakeLists.txt:
>+        * JavaScriptCore.xcodeproj/project.pbxproj:
>+        * Sources.txt:
>+        * builtins/BuiltinNames.cpp:
>+        (JSC::BuiltinNames::BuiltinNames):
>+        * builtins/BuiltinNames.h:
>+        * bytecode/CodeBlock.cpp:
>+        (JSC::CodeBlock::setConstantIdentifierSetRegisters):
>+        * bytecode/CodeBlock.h:
>+        * bytecode/HandlerInfo.h:
>+        * bytecode/InstructionStream.h:
>+        * bytecode/UnlinkedCodeBlock.h:
>+        (JSC::UnlinkedCodeBlock::addSetConstant):
>+        (JSC::UnlinkedCodeBlock::constantIdentifierSets):
>+        * bytecode/UnlinkedEvalCodeBlock.h:
>+        * bytecode/UnlinkedFunctionCodeBlock.h:
>+        * bytecode/UnlinkedFunctionExecutable.h:
>+        * bytecode/UnlinkedGlobalCodeBlock.h:
>+        (JSC::UnlinkedGlobalCodeBlock::UnlinkedGlobalCodeBlock):
>+        * bytecode/UnlinkedMetadataTable.h:
>+        * bytecode/UnlinkedModuleProgramCodeBlock.h:
>+        * bytecode/UnlinkedProgramCodeBlock.h:
>+        * interpreter/Interpreter.cpp:
>+        * jsc.cpp:
>+        (functionQuit):
>+        (runJSC):
>+        * parser/SourceCode.h:
>+        * parser/SourceCodeKey.h:
>+        (JSC::SourceCodeKey::operator!= const): Deleted.
>+        * parser/UnlinkedSourceCode.h:
>+        * parser/VariableEnvironment.h:
>+        * runtime/CachedTypes.cpp:
>+        (): Deleted.
>+        (JSC::Encoder::Allocation::buffer const): Deleted.
>+        (JSC::Encoder::Allocation::offset const): Deleted.
>+        (JSC::Encoder::Allocation::Allocation): Deleted.
>+        (JSC::Encoder::Encoder): Deleted.
>+        (JSC::Encoder::vm): Deleted.
>+        (JSC::Encoder::malloc): Deleted.
>+        (JSC::Encoder::offsetOf): Deleted.
>+        (JSC::Encoder::cachePtr): Deleted.
>+        (JSC::Encoder::offsetForPtr): Deleted.
>+        (JSC::Encoder::release): Deleted.
>+        (JSC::Encoder::Page::Page): Deleted.
>+        (JSC::Encoder::Page::malloc): Deleted.
>+        (JSC::Encoder::Page::buffer const): Deleted.
>+        (JSC::Encoder::Page::size const): Deleted.
>+        (JSC::Encoder::Page::getOffset const): Deleted.
>+        (JSC::Encoder::allocateNewPage): Deleted.
>+        (JSC::Decoder::Decoder): Deleted.
>+        (JSC::Decoder::~Decoder): Deleted.
>+        (JSC::Decoder::vm): Deleted.
>+        (JSC::Decoder::offsetOf): Deleted.
>+        (JSC::Decoder::cacheOffset): Deleted.
>+        (JSC::Decoder::addFinalizer): Deleted.
>+        (JSC::encode): Deleted.
>+        (JSC::decode): Deleted.
>+        (JSC::VariableLengthObject::buffer const): Deleted.
>+        (JSC::VariableLengthObject::allocate): Deleted.
>+        (JSC::CachedPtr::encode): Deleted.
>+        (JSC::CachedPtr::decode const): Deleted.
>+        (JSC::CachedPtr::operator-> const): Deleted.
>+        (JSC::CachedPtr::get const): Deleted.
>+        (JSC::CachedRefPtr::encode): Deleted.
>+        (JSC::CachedRefPtr::decode const): Deleted.
>+        (JSC::CachedWriteBarrier::encode): Deleted.
>+        (JSC::CachedWriteBarrier::decode const): Deleted.
>+        (JSC::CachedVector::encode): Deleted.
>+        (JSC::CachedVector::decode const): Deleted.
>+        (JSC::CachedPair::encode): Deleted.
>+        (JSC::CachedPair::decode const): Deleted.
>+        (JSC::CachedHashMap::encode): Deleted.
>+        (JSC::CachedHashMap::decode const): Deleted.
>+        (JSC::CachedUniquedStringImpl::encode): Deleted.
>+        (JSC::CachedUniquedStringImpl::decode const): Deleted.
>+        (JSC::CachedStringImpl::encode): Deleted.
>+        (JSC::CachedStringImpl::decode const): Deleted.
>+        (JSC::CachedString::encode): Deleted.
>+        (JSC::CachedString::decode const): Deleted.
>+        (JSC::CachedIdentifier::encode): Deleted.
>+        (JSC::CachedIdentifier::decode const): Deleted.
>+        (JSC::CachedOptional::encode): Deleted.
>+        (JSC::CachedOptional::decode const): Deleted.
>+        (JSC::CachedOptional::decodeAsPtr const): Deleted.
>+        (JSC::CachedSimpleJumpTable::encode): Deleted.
>+        (JSC::CachedSimpleJumpTable::decode const): Deleted.
>+        (JSC::CachedStringJumpTable::encode): Deleted.
>+        (JSC::CachedStringJumpTable::decode const): Deleted.
>+        (JSC::CachedCodeBlockRareData::encode): Deleted.
>+        (JSC::CachedCodeBlockRareData::decode const): Deleted.
>+        (JSC::CachedBitVector::encode): Deleted.
>+        (JSC::CachedBitVector::decode const): Deleted.
>+        (JSC::CachedHashSet::encode): Deleted.
>+        (JSC::CachedHashSet::decode const): Deleted.
>+        (JSC::CachedConstantIdentifierSetEntry::encode): Deleted.
>+        (JSC::CachedConstantIdentifierSetEntry::decode const): Deleted.
>+        (JSC::CachedVariableEnvironment::encode): Deleted.
>+        (JSC::CachedVariableEnvironment::decode const): Deleted.
>+        (JSC::CachedArray::encode): Deleted.
>+        (JSC::CachedArray::decode const): Deleted.
>+        (JSC::CachedScopedArgumentsTable::encode): Deleted.
>+        (JSC::CachedScopedArgumentsTable::decode const): Deleted.
>+        (JSC::CachedSymbolTableEntry::encode): Deleted.
>+        (JSC::CachedSymbolTableEntry::decode const): Deleted.
>+        (JSC::CachedSymbolTable::encode): Deleted.
>+        (JSC::CachedSymbolTable::decode const): Deleted.
>+        (JSC::CachedImmutableButterfly::encode): Deleted.
>+        (JSC::CachedImmutableButterfly::decode const): Deleted.
>+        (JSC::CachedRegExp::encode): Deleted.
>+        (JSC::CachedRegExp::decode const): Deleted.
>+        (JSC::CachedTemplateObjectDescriptor::encode): Deleted.
>+        (JSC::CachedTemplateObjectDescriptor::decode const): Deleted.
>+        (JSC::CachedBigInt::encode): Deleted.
>+        (JSC::CachedBigInt::decode const): Deleted.
>+        (JSC::CachedJSValue::encode): Deleted.
>+        (JSC::CachedJSValue::decode const): Deleted.
>+        (JSC::CachedInstructionStream::encode): Deleted.
>+        (JSC::CachedInstructionStream::decode const): Deleted.
>+        (JSC::CachedMetadataTable::encode): Deleted.
>+        (JSC::CachedMetadataTable::decode const): Deleted.
>+        (JSC::CachedSourceOrigin::encode): Deleted.
>+        (JSC::CachedSourceOrigin::decode const): Deleted.
>+        (JSC::CachedTextPosition::encode): Deleted.
>+        (JSC::CachedTextPosition::decode const): Deleted.
>+        (JSC::CachedSourceProviderShape::encode): Deleted.
>+        (JSC::CachedSourceProviderShape::decode const): Deleted.
>+        (JSC::CachedStringSourceProvider::encode): Deleted.
>+        (JSC::CachedStringSourceProvider::decode const): Deleted.
>+        (JSC::CachedWebAssemblySourceProvider::encode): Deleted.
>+        (JSC::CachedWebAssemblySourceProvider::decode const): Deleted.
>+        (JSC::CachedSourceProvider::encode): Deleted.
>+        (JSC::CachedSourceProvider::decode const): Deleted.
>+        (JSC::CachedUnlinkedSourceCodeShape::encode): Deleted.
>+        (JSC::CachedUnlinkedSourceCodeShape::decode const): Deleted.
>+        (JSC::CachedSourceCode::encode): Deleted.
>+        (JSC::CachedSourceCode::decode const): Deleted.
>+        (JSC::CachedFunctionExecutable::firstLineOffset const): Deleted.
>+        (JSC::CachedFunctionExecutable::lineCount const): Deleted.
>+        (JSC::CachedFunctionExecutable::unlinkedFunctionNameStart const): Deleted.
>+        (JSC::CachedFunctionExecutable::unlinkedBodyStartColumn const): Deleted.
>+        (JSC::CachedFunctionExecutable::unlinkedBodyEndColumn const): Deleted.
>+        (JSC::CachedFunctionExecutable::startOffset const): Deleted.
>+        (JSC::CachedFunctionExecutable::sourceLength const): Deleted.
>+        (JSC::CachedFunctionExecutable::parametersStartOffset const): Deleted.
>+        (JSC::CachedFunctionExecutable::typeProfilingStartOffset const): Deleted.
>+        (JSC::CachedFunctionExecutable::typeProfilingEndOffset const): Deleted.
>+        (JSC::CachedFunctionExecutable::parameterCount const): Deleted.
>+        (JSC::CachedFunctionExecutable::features const): Deleted.
>+        (JSC::CachedFunctionExecutable::sourceParseMode const): Deleted.
>+        (JSC::CachedFunctionExecutable::isInStrictContext const): Deleted.
>+        (JSC::CachedFunctionExecutable::hasCapturedVariables const): Deleted.
>+        (JSC::CachedFunctionExecutable::isBuiltinFunction const): Deleted.
>+        (JSC::CachedFunctionExecutable::isBuiltinDefaultClassConstructor const): Deleted.
>+        (JSC::CachedFunctionExecutable::constructAbility const): Deleted.
>+        (JSC::CachedFunctionExecutable::constructorKind const): Deleted.
>+        (JSC::CachedFunctionExecutable::functionMode const): Deleted.
>+        (JSC::CachedFunctionExecutable::scriptMode const): Deleted.
>+        (JSC::CachedFunctionExecutable::superBinding const): Deleted.
>+        (JSC::CachedFunctionExecutable::derivedContextType const): Deleted.
>+        (JSC::CachedFunctionExecutable::name const): Deleted.
>+        (JSC::CachedFunctionExecutable::ecmaName const): Deleted.
>+        (JSC::CachedFunctionExecutable::inferredName const): Deleted.
>+        (JSC::CachedCodeBlock::instructions const): Deleted.
>+        (JSC::CachedCodeBlock::thisRegister const): Deleted.
>+        (JSC::CachedCodeBlock::scopeRegister const): Deleted.
>+        (JSC::CachedCodeBlock::globalObjectRegister const): Deleted.
>+        (JSC::CachedCodeBlock::sourceURLDirective const): Deleted.
>+        (JSC::CachedCodeBlock::sourceMappingURLDirective const): Deleted.
>+        (JSC::CachedCodeBlock::usesEval const): Deleted.
>+        (JSC::CachedCodeBlock::isStrictMode const): Deleted.
>+        (JSC::CachedCodeBlock::isConstructor const): Deleted.
>+        (JSC::CachedCodeBlock::hasCapturedVariables const): Deleted.
>+        (JSC::CachedCodeBlock::isBuiltinFunction const): Deleted.
>+        (JSC::CachedCodeBlock::superBinding const): Deleted.
>+        (JSC::CachedCodeBlock::scriptMode const): Deleted.
>+        (JSC::CachedCodeBlock::isArrowFunctionContext const): Deleted.
>+        (JSC::CachedCodeBlock::isClassContext const): Deleted.
>+        (JSC::CachedCodeBlock::wasCompiledWithDebuggingOpcodes const): Deleted.
>+        (JSC::CachedCodeBlock::constructorKind const): Deleted.
>+        (JSC::CachedCodeBlock::derivedContextType const): Deleted.
>+        (JSC::CachedCodeBlock::evalContextType const): Deleted.
>+        (JSC::CachedCodeBlock::hasTailCalls const): Deleted.
>+        (JSC::CachedCodeBlock::lineCount const): Deleted.
>+        (JSC::CachedCodeBlock::endColumn const): Deleted.
>+        (JSC::CachedCodeBlock::numVars const): Deleted.
>+        (JSC::CachedCodeBlock::numCalleeLocals const): Deleted.
>+        (JSC::CachedCodeBlock::numParameters const): Deleted.
>+        (JSC::CachedCodeBlock::features const): Deleted.
>+        (JSC::CachedCodeBlock::parseMode const): Deleted.
>+        (JSC::CachedCodeBlock::codeType const): Deleted.
>+        (JSC::CachedCodeBlock::rareData const): Deleted.
>+        (JSC::CachedProgramCodeBlock::encode): Deleted.
>+        (JSC::CachedProgramCodeBlock::decode const): Deleted.
>+        (JSC::CachedModuleCodeBlock::encode): Deleted.
>+        (JSC::CachedModuleCodeBlock::decode const): Deleted.
>+        (JSC::CachedEvalCodeBlock::encode): Deleted.
>+        (JSC::CachedEvalCodeBlock::decode const): Deleted.
>+        (JSC::CachedFunctionCodeBlock::encode): Deleted.
>+        (JSC::CachedFunctionCodeBlock::decode const): Deleted.
>+        (JSC::UnlinkedFunctionCodeBlock::UnlinkedFunctionCodeBlock): Deleted.
>+        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock): Deleted.
>+        (JSC::CachedCodeBlock<CodeBlockType>::decode const): Deleted.
>+        (JSC::UnlinkedProgramCodeBlock::UnlinkedProgramCodeBlock): Deleted.
>+        (JSC::UnlinkedModuleProgramCodeBlock::UnlinkedModuleProgramCodeBlock): Deleted.
>+        (JSC::UnlinkedEvalCodeBlock::UnlinkedEvalCodeBlock): Deleted.
>+        (JSC::CachedFunctionExecutable::encode): Deleted.
>+        (JSC::CachedFunctionExecutable::decode const): Deleted.
>+        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable): Deleted.
>+        (JSC::CachedCodeBlock<CodeBlockType>::encode): Deleted.
>+        (JSC::CachedSourceCodeKey::encode): Deleted.
>+        (JSC::CachedSourceCodeKey::decode const): Deleted.
>+        (JSC::CacheEntry::encode): Deleted.
>+        (JSC::CacheEntry:: const): Deleted.
>+        (JSC:: const): Deleted.
>+        (JSC::encodeCodeBlock): Deleted.
>+        (JSC::decodeCodeBlockImpl): Deleted.
>+        * runtime/CachedTypes.h:
>+        (JSC::decodeCodeBlock): Deleted.
>+        * runtime/CodeCache.cpp:
>+        (JSC::CodeCacheMap::pruneSlowCase):
>+        (JSC::CodeCache::getUnlinkedGlobalCodeBlock):
>+        (JSC::CodeCache::getUnlinkedGlobalFunctionExecutable):
>+        (JSC::CodeCache::write): Deleted.
>+        * runtime/CodeCache.h:
>+        (JSC::CodeCacheMap::findCacheAndUpdateAge):
>+        (JSC::CodeCache::clear):
>+        (JSC::CodeCacheMap::begin): Deleted.
>+        (JSC::CodeCacheMap::end): Deleted.
>+        (JSC::CodeCacheMap::fetchFromDiskImpl): Deleted.
>+        (): Deleted.
>+        (JSC::writeCodeBlock): Deleted.
>+        * runtime/JSBigInt.cpp:
>+        (JSC::JSBigInt::offsetOfData):
>+        (JSC::JSBigInt::dataStorage):
>+        * runtime/JSBigInt.h:
>+        * runtime/Options.cpp:
>+        (JSC::recomputeDependentOptions):
>+        * runtime/Options.h:
>+        * runtime/RegExp.h:
>+        * runtime/ScopedArgumentsTable.h:
>+        * runtime/StackFrame.h:
>+        * runtime/StructureInlines.h:
>+        * runtime/SymbolTable.h:
>+
> 2019-01-20  Yusuke Suzuki  <ysuzuki@apple.com>
> 
>         [JSC] Invalidate old scope operations using global lexical binding epoch
>Index: Source/JavaScriptCore/CMakeLists.txt
>===================================================================
>--- Source/JavaScriptCore/CMakeLists.txt	(revision 240220)
>+++ Source/JavaScriptCore/CMakeLists.txt	(working copy)
>@@ -833,7 +833,6 @@ set(JavaScriptCore_PRIVATE_FRAMEWORK_HEA
>     runtime/JSGlobalLexicalEnvironment.h
>     runtime/JSGlobalObject.h
>     runtime/JSGlobalObjectInlines.h
>-    runtime/JSImmutableButterfly.h
>     runtime/JSInternalPromise.h
>     runtime/JSInternalPromiseDeferred.h
>     runtime/JSMicrotask.h
>@@ -849,7 +848,6 @@ set(JavaScriptCore_PRIVATE_FRAMEWORK_HEA
>     runtime/JSPromise.h
>     runtime/JSPromiseConstructor.h
>     runtime/JSPromiseDeferred.h
>-    runtime/JSPropertyNameEnumerator.h
>     runtime/JSProxy.h
>     runtime/JSRunLoopTimer.h
>     runtime/JSScope.h
>Index: Source/JavaScriptCore/Sources.txt
>===================================================================
>--- Source/JavaScriptCore/Sources.txt	(revision 240220)
>+++ Source/JavaScriptCore/Sources.txt	(working copy)
>@@ -713,7 +713,6 @@ runtime/BooleanConstructor.cpp
> runtime/BooleanObject.cpp
> runtime/BooleanPrototype.cpp
> runtime/CallData.cpp
>-runtime/CachedTypes.cpp
> runtime/CatchScope.cpp
> runtime/ClassInfo.cpp
> runtime/ClonedArguments.cpp
>Index: Source/JavaScriptCore/jsc.cpp
>===================================================================
>--- Source/JavaScriptCore/jsc.cpp	(revision 240220)
>+++ Source/JavaScriptCore/jsc.cpp	(working copy)
>@@ -28,7 +28,6 @@
> #include "ButterflyInlines.h"
> #include "CatchScope.h"
> #include "CodeBlock.h"
>-#include "CodeCache.h"
> #include "Completion.h"
> #include "ConfigFile.h"
> #include "Disassembler.h"
>@@ -1989,11 +1988,8 @@ EncodedJSValue JSC_HOST_CALL functionFai
>     return JSValue::encode(jsUndefined());
> }
> 
>-EncodedJSValue JSC_HOST_CALL functionQuit(ExecState* exec)
>+EncodedJSValue JSC_HOST_CALL functionQuit(ExecState*)
> {
>-    VM& vm = exec->vm();
>-    vm.codeCache()->write(vm);
>-
>     jscExit(EXIT_SUCCESS);
> 
> #if COMPILER(MSVC)
>@@ -2880,8 +2876,6 @@ int runJSC(const CommandLine& options, b
> #endif
>     }
> 
>-    vm.codeCache()->write(vm);
>-
>     if (isWorker) {
>         JSLockHolder locker(vm);
>         // This is needed because we don't want the worker's main
>Index: Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>===================================================================
>--- Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj	(revision 240220)
>+++ Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj	(working copy)
>@@ -826,7 +826,7 @@
> 		262D85B71C0D650F006ACB61 /* AirFixPartialRegisterStalls.h in Headers */ = {isa = PBXBuildFile; fileRef = 262D85B51C0D650F006ACB61 /* AirFixPartialRegisterStalls.h */; };
> 		2684D4381C00161C0081D663 /* AirLiveness.h in Headers */ = {isa = PBXBuildFile; fileRef = 2684D4371C00161C0081D663 /* AirLiveness.h */; };
> 		269D636E1BFBE5D100101B1D /* FTLOutput.h in Headers */ = {isa = PBXBuildFile; fileRef = 269D636D1BFBE5D000101B1D /* FTLOutput.h */; };
>-		2A05ABD61961DF2400341750 /* JSPropertyNameEnumerator.h in Headers */ = {isa = PBXBuildFile; fileRef = 2A05ABD41961DF2400341750 /* JSPropertyNameEnumerator.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		2A05ABD61961DF2400341750 /* JSPropertyNameEnumerator.h in Headers */ = {isa = PBXBuildFile; fileRef = 2A05ABD41961DF2400341750 /* JSPropertyNameEnumerator.h */; };
> 		2A111246192FCE79005EE18D /* CustomGetterSetter.h in Headers */ = {isa = PBXBuildFile; fileRef = 2A111244192FCE79005EE18D /* CustomGetterSetter.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		2A48D1911772365B00C65A5F /* APICallbackFunction.h in Headers */ = {isa = PBXBuildFile; fileRef = C211B574176A224D000E2A23 /* APICallbackFunction.h */; };
> 		2A4BB7F318A41179008A0FCD /* JSManagedValueInternal.h in Headers */ = {isa = PBXBuildFile; fileRef = 2A4BB7F218A41179008A0FCD /* JSManagedValueInternal.h */; };
>@@ -1062,7 +1062,7 @@
> 		53EAFE2F208DFAB4007D524B /* testapi.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 531D4E191F59CDD200EC836C /* testapi.cpp */; };
> 		53EE01B6218F691600AD1F8D /* JSScript.h in Headers */ = {isa = PBXBuildFile; fileRef = 53EE01B5218F690F00AD1F8D /* JSScript.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		53EE01B8218F7EFF00AD1F8D /* JSScriptInternal.h in Headers */ = {isa = PBXBuildFile; fileRef = 53EE01B7218F7EFF00AD1F8D /* JSScriptInternal.h */; };
>-		53F11F41209138D700E411A7 /* JSImmutableButterfly.h in Headers */ = {isa = PBXBuildFile; fileRef = 53F11F40209138D700E411A7 /* JSImmutableButterfly.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		53F11F41209138D700E411A7 /* JSImmutableButterfly.h in Headers */ = {isa = PBXBuildFile; fileRef = 53F11F40209138D700E411A7 /* JSImmutableButterfly.h */; };
> 		53F40E851D58F9770099A1B6 /* WasmSections.h in Headers */ = {isa = PBXBuildFile; fileRef = 53F40E841D58F9770099A1B6 /* WasmSections.h */; };
> 		53F40E8B1D5901BB0099A1B6 /* WasmFunctionParser.h in Headers */ = {isa = PBXBuildFile; fileRef = 53F40E8A1D5901BB0099A1B6 /* WasmFunctionParser.h */; };
> 		53F40E8D1D5901F20099A1B6 /* WasmParser.h in Headers */ = {isa = PBXBuildFile; fileRef = 53F40E8C1D5901F20099A1B6 /* WasmParser.h */; };
>@@ -3128,7 +3128,6 @@
> 		14386A731DD69895008652C4 /* DirectEvalExecutable.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DirectEvalExecutable.h; sourceTree = "<group>"; };
> 		14386A761DD6989C008652C4 /* IndirectEvalExecutable.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = IndirectEvalExecutable.cpp; sourceTree = "<group>"; };
> 		14386A771DD6989C008652C4 /* IndirectEvalExecutable.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = IndirectEvalExecutable.h; sourceTree = "<group>"; };
>-		143BE26521C857770020CD17 /* CachedTypes.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CachedTypes.h; sourceTree = "<group>"; };
> 		1440051F0A531D3B0005F061 /* Node.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Node.h; path = tests/Node.h; sourceTree = "<group>"; };
> 		144005200A531D3B0005F061 /* Node.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = Node.c; path = tests/Node.c; sourceTree = "<group>"; };
> 		144007480A536CC20005F061 /* NodeList.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = NodeList.h; path = tests/NodeList.h; sourceTree = "<group>"; };
>@@ -3243,7 +3242,6 @@
> 		14D857740A4696C80032146C /* testapi.js */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.javascript; name = testapi.js; path = API/tests/testapi.js; sourceTree = "<group>"; };
> 		14DA818E0D99FD2000B0A4FB /* JSLexicalEnvironment.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSLexicalEnvironment.h; sourceTree = "<group>"; };
> 		14DA818F0D99FD2000B0A4FB /* JSLexicalEnvironment.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSLexicalEnvironment.cpp; sourceTree = "<group>"; };
>-		14DAFA4521E3B871004B68F7 /* CachedTypes.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = CachedTypes.cpp; sourceTree = "<group>"; };
> 		14DE0D680D02431400AACCA2 /* JSGlobalObject.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; lineEnding = 0; path = JSGlobalObject.cpp; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.cpp; };
> 		14DF04D916B3996D0016A513 /* StaticPropertyAnalysis.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = StaticPropertyAnalysis.h; sourceTree = "<group>"; };
> 		14E84F9914EE1ACC00D6D5D4 /* WeakBlock.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = WeakBlock.cpp; sourceTree = "<group>"; };
>@@ -6602,8 +6600,6 @@
> 				9E729409190F0306001A91B5 /* BundlePath.mm */,
> 				0FB7F38B15ED8E3800F167B2 /* Butterfly.h */,
> 				0FB7F38C15ED8E3800F167B2 /* ButterflyInlines.h */,
>-				14DAFA4521E3B871004B68F7 /* CachedTypes.cpp */,
>-				143BE26521C857770020CD17 /* CachedTypes.h */,
> 				0FEC3C5F1F379F5300F59B6C /* CagedBarrierPtr.h */,
> 				BCA62DFE0E2826230004F30D /* CallData.cpp */,
> 				145C507F0D9DF63B0088F6B9 /* CallData.h */,
>Index: Source/JavaScriptCore/builtins/BuiltinNames.cpp
>===================================================================
>--- Source/JavaScriptCore/builtins/BuiltinNames.cpp	(revision 240220)
>+++ Source/JavaScriptCore/builtins/BuiltinNames.cpp	(working copy)
>@@ -63,7 +63,6 @@ BuiltinNames::BuiltinNames(VM* vm, Commo
>     JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(INITIALIZE_PRIVATE_TO_PUBLIC_ENTRY)
>     JSC_FOREACH_BUILTIN_FUNCTION_NAME(INITIALIZE_PUBLIC_TO_PRIVATE_ENTRY)
>     JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_PROPERTY_NAME(INITIALIZE_PUBLIC_TO_PRIVATE_ENTRY)
>-    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_SYMBOL_PRIVATE_TO_PUBLIC_ENTRY)
>     JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_SYMBOL_PUBLIC_TO_PRIVATE_ENTRY)
>     m_privateToPublicMap.add(m_dollarVMPrivateName.impl(), &m_dollarVMName);
>     m_publicToPrivateMap.add(m_dollarVMName.impl(), &m_dollarVMPrivateName);
>Index: Source/JavaScriptCore/builtins/BuiltinNames.h
>===================================================================
>--- Source/JavaScriptCore/builtins/BuiltinNames.h	(revision 240220)
>+++ Source/JavaScriptCore/builtins/BuiltinNames.h	(working copy)
>@@ -213,7 +213,6 @@ extern SymbolImpl::StaticSymbolImpl poly
> // We commandeer the publicToPrivateMap to allow us to convert private symbol names into the appropriate symbol.
> // e.g. @iteratorSymbol points to Symbol.iterator in this map rather than to a an actual private name.
> // FIXME: This is a weird hack and we shouldn't need to do this.
>-#define INITIALIZE_SYMBOL_PRIVATE_TO_PUBLIC_ENTRY(name) m_privateToPublicMap.add(m_##name##Symbol.impl(), &m_##name##SymbolPrivateIdentifier);
> #define INITIALIZE_SYMBOL_PUBLIC_TO_PRIVATE_ENTRY(name) m_publicToPrivateMap.add(m_##name##SymbolPrivateIdentifier.impl(), &m_##name##Symbol);
> 
> class BuiltinNames {
>Index: Source/JavaScriptCore/bytecode/CodeBlock.cpp
>===================================================================
>--- Source/JavaScriptCore/bytecode/CodeBlock.cpp	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/CodeBlock.cpp	(working copy)
>@@ -869,7 +869,7 @@ CodeBlock::~CodeBlock()
> #endif // ENABLE(JIT)
> }
> 
>-void CodeBlock::setConstantIdentifierSetRegisters(VM& vm, const Vector<ConstantIdentifierSetEntry>& constants)
>+void CodeBlock::setConstantIdentifierSetRegisters(VM& vm, const Vector<ConstantIndentifierSetEntry>& constants)
> {
>     auto scope = DECLARE_THROW_SCOPE(vm);
>     JSGlobalObject* globalObject = m_globalObject.get();
>Index: Source/JavaScriptCore/bytecode/CodeBlock.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/CodeBlock.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/CodeBlock.h	(working copy)
>@@ -890,7 +890,7 @@ private:
> 
>     void updateAllPredictionsAndCountLiveness(unsigned& numberOfLiveNonArgumentValueProfiles, unsigned& numberOfSamplesInProfiles);
> 
>-    void setConstantIdentifierSetRegisters(VM&, const Vector<ConstantIdentifierSetEntry>& constants);
>+    void setConstantIdentifierSetRegisters(VM&, const Vector<ConstantIndentifierSetEntry>& constants);
> 
>     void setConstantRegisters(const Vector<WriteBarrier<Unknown>>& constants, const Vector<SourceCodeRepresentation>& constantsSourceCodeRepresentation);
> 
>Index: Source/JavaScriptCore/bytecode/HandlerInfo.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/HandlerInfo.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/HandlerInfo.h	(working copy)
>@@ -89,10 +89,6 @@ struct HandlerInfoBase {
> };
> 
> struct UnlinkedHandlerInfo : public HandlerInfoBase {
>-    UnlinkedHandlerInfo()
>-    {
>-    }
>-
>     UnlinkedHandlerInfo(uint32_t start, uint32_t end, uint32_t target, HandlerType handlerType)
>     {
>         this->start = start;
>Index: Source/JavaScriptCore/bytecode/InstructionStream.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/InstructionStream.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/InstructionStream.h	(working copy)
>@@ -39,7 +39,6 @@ class InstructionStream {
>     using InstructionBuffer = Vector<uint8_t, 0, UnsafeVectorOverflow>;
> 
>     friend class InstructionStreamWriter;
>-    friend class CachedInstructionStream;
> public:
>     size_t sizeInBytes() const;
> 
>Index: Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedCodeBlock.h	(working copy)
>@@ -65,15 +65,12 @@ class UnlinkedFunctionCodeBlock;
> class UnlinkedFunctionExecutable;
> struct ExecutableInfo;
> 
>-template<typename CodeBlockType>
>-class CachedCodeBlock;
>-
> typedef unsigned UnlinkedValueProfile;
> typedef unsigned UnlinkedArrayProfile;
> typedef unsigned UnlinkedArrayAllocationProfile;
> typedef unsigned UnlinkedObjectAllocationProfile;
> typedef unsigned UnlinkedLLIntCallLinkInfo;
>-using ConstantIdentifierSetEntry = std::pair<IdentifierSet, unsigned>;
>+using ConstantIndentifierSetEntry = std::pair<IdentifierSet, unsigned>;
> 
> struct UnlinkedStringJumpTable {
>     struct OffsetLocation {
>@@ -171,7 +168,7 @@ public:
>         unsigned result = m_constantRegisters.size();
>         m_constantRegisters.append(WriteBarrier<Unknown>());
>         m_constantsSourceCodeRepresentation.append(SourceCodeRepresentation::Other);
>-        m_constantIdentifierSets.append(ConstantIdentifierSetEntry(set, result));
>+        m_constantIdentifierSets.append(ConstantIndentifierSetEntry(set, result));
>     }
> 
>     unsigned addConstant(JSValue v, SourceCodeRepresentation sourceCodeRepresentation = SourceCodeRepresentation::Other)
>@@ -205,7 +202,7 @@ public:
>         return m_linkTimeConstants[index];
>     }
>     const Vector<WriteBarrier<Unknown>>& constantRegisters() { return m_constantRegisters; }
>-    const Vector<ConstantIdentifierSetEntry>& constantIdentifierSets() { return m_constantIdentifierSets; }
>+    const Vector<ConstantIndentifierSetEntry>& constantIdentifierSets() { return m_constantIdentifierSets; }
>     const WriteBarrier<Unknown>& constantRegister(int index) const { return m_constantRegisters[index - FirstConstantRegisterIndex]; }
>     ALWAYS_INLINE bool isConstantRegisterIndex(int index) const { return index >= FirstConstantRegisterIndex; }
>     ALWAYS_INLINE JSValue getConstant(int index) const { return m_constantRegisters[index - FirstConstantRegisterIndex].get(); }
>@@ -370,10 +367,6 @@ public:
> 
> protected:
>     UnlinkedCodeBlock(VM*, Structure*, CodeType, const ExecutableInfo&, DebuggerMode);
>-
>-    template<typename CodeBlockType>
>-    UnlinkedCodeBlock(Decoder&, Structure*, const CachedCodeBlock<CodeBlockType>&);
>-
>     ~UnlinkedCodeBlock();
> 
>     void finishCreation(VM& vm)
>@@ -385,9 +378,6 @@ private:
>     friend class BytecodeRewriter;
>     friend class BytecodeGenerator;
> 
>-    template<typename CodeBlockType>
>-    friend class CachedCodeBlock;
>-
>     void applyModification(BytecodeRewriter&, InstructionStreamWriter&);
> 
>     void createRareDataIfNecessary()
>@@ -454,7 +444,7 @@ private:
>     Vector<Identifier> m_identifiers;
>     Vector<BitVector> m_bitVectors;
>     Vector<WriteBarrier<Unknown>> m_constantRegisters;
>-    Vector<ConstantIdentifierSetEntry> m_constantIdentifierSets;
>+    Vector<ConstantIndentifierSetEntry> m_constantIdentifierSets;
>     Vector<SourceCodeRepresentation> m_constantsSourceCodeRepresentation;
>     typedef Vector<WriteBarrier<UnlinkedFunctionExecutable>> FunctionExpressionVector;
>     FunctionExpressionVector m_functionDecls;
>Index: Source/JavaScriptCore/bytecode/UnlinkedEvalCodeBlock.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedEvalCodeBlock.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedEvalCodeBlock.h	(working copy)
>@@ -29,8 +29,6 @@
> 
> namespace JSC {
> 
>-class CachedEvalCodeBlock;
>-
> class UnlinkedEvalCodeBlock final : public UnlinkedGlobalCodeBlock {
> public:
>     typedef UnlinkedGlobalCodeBlock Base;
>@@ -61,15 +59,11 @@ public:
>         m_functionHoistingCandidates = WTFMove(functionHoistingCandidates);
>     }
> private:
>-    friend CachedEvalCodeBlock;
>-
>     UnlinkedEvalCodeBlock(VM* vm, Structure* structure, const ExecutableInfo& info, DebuggerMode debuggerMode)
>         : Base(vm, structure, EvalCode, info, debuggerMode)
>     {
>     }
> 
>-    UnlinkedEvalCodeBlock(Decoder&, const CachedEvalCodeBlock&);
>-
>     Vector<Identifier, 0, UnsafeVectorOverflow> m_variables;
>     Vector<Identifier, 0, UnsafeVectorOverflow> m_functionHoistingCandidates;
> 
>Index: Source/JavaScriptCore/bytecode/UnlinkedFunctionCodeBlock.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedFunctionCodeBlock.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedFunctionCodeBlock.h	(working copy)
>@@ -29,8 +29,6 @@
> 
> namespace JSC {
> 
>-class CachedFunctionCodeBlock;
>-
> class UnlinkedFunctionCodeBlock final : public UnlinkedCodeBlock {
> public:
>     typedef UnlinkedCodeBlock Base;
>@@ -46,14 +44,10 @@ public:
>     static void destroy(JSCell*);
> 
> private:
>-    friend CachedFunctionCodeBlock;
>-
>     UnlinkedFunctionCodeBlock(VM* vm, Structure* structure, CodeType codeType, const ExecutableInfo& info, DebuggerMode debuggerMode)
>         : Base(vm, structure, codeType, info, debuggerMode)
>     {
>     }
>-
>-    UnlinkedFunctionCodeBlock(Decoder&, const CachedFunctionCodeBlock&);
>     
> public:
>     static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto)
>Index: Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.h	(working copy)
>@@ -39,13 +39,11 @@
> 
> namespace JSC {
> 
>-class Decoder;
> class FunctionMetadataNode;
> class FunctionExecutable;
> class ParserError;
> class SourceProvider;
> class UnlinkedFunctionCodeBlock;
>-class CachedFunctionExecutable;
> 
> enum UnlinkedFunctionKind {
>     UnlinkedNormalFunction,
>@@ -56,7 +54,6 @@ class UnlinkedFunctionExecutable final :
> public:
>     friend class CodeCache;
>     friend class VM;
>-    friend CachedFunctionExecutable;
> 
>     typedef JSCell Base;
>     static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
>@@ -150,7 +147,6 @@ public:
> 
> private:
>     UnlinkedFunctionExecutable(VM*, Structure*, const SourceCode&, FunctionMetadataNode*, UnlinkedFunctionKind, ConstructAbility, JSParserScriptMode, VariableEnvironment&,  JSC::DerivedContextType, bool isBuiltinDefaultClassConstructor);
>-    UnlinkedFunctionExecutable(Decoder&, VariableEnvironment&, const CachedFunctionExecutable&);
> 
>     unsigned m_firstLineOffset;
>     unsigned m_lineCount;
>Index: Source/JavaScriptCore/bytecode/UnlinkedGlobalCodeBlock.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedGlobalCodeBlock.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedGlobalCodeBlock.h	(working copy)
>@@ -38,12 +38,6 @@ protected:
>         : Base(vm, structure, codeType, info, debuggerMode)
>     {
>     }
>-
>-    template<typename CodeBlockType>
>-    UnlinkedGlobalCodeBlock(Decoder& decoder, Structure* structure, const CachedCodeBlock<CodeBlockType>& cachedCodeBlock)
>-        : Base(decoder, structure, cachedCodeBlock)
>-    {
>-    }
> };
> 
> }
>Index: Source/JavaScriptCore/bytecode/UnlinkedMetadataTable.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedMetadataTable.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedMetadataTable.h	(working copy)
>@@ -35,7 +35,6 @@ class MetadataTable;
> class UnlinkedMetadataTable {
>     friend class LLIntOffsetsExtractor;
>     friend class MetadataTable;
>-    friend class CachedMetadataTable;
> 
> public:
>     struct LinkingData {
>Index: Source/JavaScriptCore/bytecode/UnlinkedModuleProgramCodeBlock.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedModuleProgramCodeBlock.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedModuleProgramCodeBlock.h	(working copy)
>@@ -29,9 +29,6 @@
> 
> namespace JSC {
> 
>-class Decoder;
>-class CachedModuleCodeBlock;
>-
> class UnlinkedModuleProgramCodeBlock final : public UnlinkedGlobalCodeBlock {
> public:
>     typedef UnlinkedGlobalCodeBlock Base;
>@@ -77,15 +74,11 @@ public:
>     }
> 
> private:
>-    friend CachedModuleCodeBlock;
>-
>     UnlinkedModuleProgramCodeBlock(VM* vm, Structure* structure, const ExecutableInfo& info, DebuggerMode debuggerMode)
>         : Base(vm, structure, ModuleCode, info, debuggerMode)
>     {
>     }
> 
>-    UnlinkedModuleProgramCodeBlock(Decoder&, const CachedModuleCodeBlock&);
>-
>     int m_moduleEnvironmentSymbolTableConstantRegisterOffset { 0 };
> 
> public:
>Index: Source/JavaScriptCore/bytecode/UnlinkedProgramCodeBlock.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedProgramCodeBlock.h	(revision 240220)
>+++ Source/JavaScriptCore/bytecode/UnlinkedProgramCodeBlock.h	(working copy)
>@@ -29,8 +29,6 @@
> 
> namespace JSC {
> 
>-class CachedProgramCodeBlock;
>-
> class UnlinkedProgramCodeBlock final : public UnlinkedGlobalCodeBlock {
> public:
>     typedef UnlinkedGlobalCodeBlock Base;
>@@ -52,15 +50,11 @@ public:
>     const VariableEnvironment& lexicalDeclarations() const { return m_lexicalDeclarations; }
> 
> private:
>-    friend CachedProgramCodeBlock;
>-
>     UnlinkedProgramCodeBlock(VM* vm, Structure* structure, const ExecutableInfo& info, DebuggerMode debuggerMode)
>         : Base(vm, structure, GlobalCode, info, debuggerMode)
>     {
>     }
> 
>-    UnlinkedProgramCodeBlock(Decoder&, const CachedProgramCodeBlock&);
>-
>     VariableEnvironment m_varDeclarations;
>     VariableEnvironment m_lexicalDeclarations;
> 
>Index: Source/JavaScriptCore/interpreter/Interpreter.cpp
>===================================================================
>--- Source/JavaScriptCore/interpreter/Interpreter.cpp	(revision 240220)
>+++ Source/JavaScriptCore/interpreter/Interpreter.cpp	(working copy)
>@@ -35,7 +35,6 @@
> #include "CallFrameClosure.h"
> #include "CatchScope.h"
> #include "CodeBlock.h"
>-#include "CodeCache.h"
> #include "DirectArguments.h"
> #include "Heap.h"
> #include "Debugger.h"
>Index: Source/JavaScriptCore/parser/SourceCode.h
>===================================================================
>--- Source/JavaScriptCore/parser/SourceCode.h	(revision 240220)
>+++ Source/JavaScriptCore/parser/SourceCode.h	(working copy)
>@@ -33,8 +33,6 @@
> namespace JSC {
> 
>     class SourceCode : public UnlinkedSourceCode {
>-        friend class CachedSourceCode;
>-
>     public:
>         SourceCode()
>             : UnlinkedSourceCode()
>Index: Source/JavaScriptCore/parser/SourceCodeKey.h
>===================================================================
>--- Source/JavaScriptCore/parser/SourceCodeKey.h	(revision 240220)
>+++ Source/JavaScriptCore/parser/SourceCodeKey.h	(working copy)
>@@ -37,8 +37,6 @@ enum class TypeProfilerEnabled { No, Yes
> enum class ControlFlowProfilerEnabled { No, Yes };
> 
> class SourceCodeFlags {
>-    friend class CachedSourceCodeKey;
>-
> public:
>     SourceCodeFlags() = default;
> 
>@@ -72,8 +70,6 @@ private:
> };
> 
> class SourceCodeKey {
>-    friend class CachedSourceCodeKey;
>-
> public:
>     SourceCodeKey()
>     {
>@@ -118,11 +114,6 @@ public:
>             && string() == other.string();
>     }
> 
>-    bool operator!=(const SourceCodeKey& other) const
>-    {
>-        return !(*this == other);
>-    }
>-
>     struct Hash {
>         static unsigned hash(const SourceCodeKey& key) { return key.hash(); }
>         static bool equal(const SourceCodeKey& a, const SourceCodeKey& b) { return a == b; }
>Index: Source/JavaScriptCore/parser/UnlinkedSourceCode.h
>===================================================================
>--- Source/JavaScriptCore/parser/UnlinkedSourceCode.h	(revision 240220)
>+++ Source/JavaScriptCore/parser/UnlinkedSourceCode.h	(working copy)
>@@ -35,9 +35,6 @@
> namespace JSC {
> 
>     class UnlinkedSourceCode {
>-        template<typename SourceType>
>-        friend class CachedUnlinkedSourceCodeShape;
>-
>     public:
>         UnlinkedSourceCode()
>             : m_provider(0)
>Index: Source/JavaScriptCore/parser/VariableEnvironment.h
>===================================================================
>--- Source/JavaScriptCore/parser/VariableEnvironment.h	(revision 240220)
>+++ Source/JavaScriptCore/parser/VariableEnvironment.h	(working copy)
>@@ -116,8 +116,6 @@ public:
>     bool isEverythingCaptured() const { return m_isEverythingCaptured; }
> 
> private:
>-    friend class CachedVariableEnvironment;
>-
>     Map m_map;
>     bool m_isEverythingCaptured { false };
> };
>Index: Source/JavaScriptCore/runtime/CachedTypes.cpp
>===================================================================
>--- Source/JavaScriptCore/runtime/CachedTypes.cpp	(revision 240220)
>+++ Source/JavaScriptCore/runtime/CachedTypes.cpp	(working copy)
>@@ -1,2024 +0,0 @@
>-/*
>- * Copyright (C) 2018 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. ``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
>- * 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 "CachedTypes.h"
>-
>-#include "BytecodeLivenessAnalysis.h"
>-#include "JSCast.h"
>-#include "JSImmutableButterfly.h"
>-#include "JSTemplateObjectDescriptor.h"
>-#include "ScopedArgumentsTable.h"
>-#include "SourceCodeKey.h"
>-#include "UnlinkedEvalCodeBlock.h"
>-#include "UnlinkedFunctionCodeBlock.h"
>-#include "UnlinkedMetadataTableInlines.h"
>-#include "UnlinkedModuleProgramCodeBlock.h"
>-#include "UnlinkedProgramCodeBlock.h"
>-#include <wtf/FastMalloc.h>
>-#include <wtf/Forward.h>
>-#include <wtf/Optional.h>
>-#include <wtf/text/AtomicStringImpl.h>
>-
>-namespace JSC {
>-
>-template <typename T, typename = void>
>-struct SourceTypeImpl {
>-    using type = T;
>-};
>-
>-template<typename T>
>-struct SourceTypeImpl<T, std::enable_if_t<!std::is_fundamental<T>::value && !std::is_same<typename T::SourceType_, void>::value>> {
>-    using type = typename T::SourceType_;
>-
>-};
>-
>-template<typename T>
>-using SourceType = typename SourceTypeImpl<T>::type;
>-
>-class Encoder {
>-    WTF_MAKE_NONCOPYABLE(Encoder);
>-    WTF_FORBID_HEAP_ALLOCATION;
>-
>-public:
>-    class Allocation {
>-        friend class Encoder;
>-
>-    public:
>-        uint8_t* buffer() const { return m_buffer; }
>-        ptrdiff_t offset() const { return m_offset; }
>-
>-    private:
>-        Allocation(uint8_t* buffer, ptrdiff_t offset)
>-            : m_buffer(buffer)
>-            , m_offset(offset)
>-        {
>-        }
>-
>-        uint8_t* m_buffer;
>-        ptrdiff_t m_offset;
>-    };
>-
>-    Encoder(VM& vm)
>-        : m_vm(vm)
>-        , m_baseOffset(0)
>-        , m_currentPage(nullptr)
>-    {
>-        allocateNewPage();
>-    }
>-
>-    VM& vm() { return m_vm; }
>-
>-    Allocation malloc(unsigned size)
>-    {
>-        ASSERT(size);
>-        ptrdiff_t offset;
>-        if (m_currentPage->malloc(size, offset))
>-            return Allocation { m_currentPage->buffer() + offset, m_baseOffset + offset };
>-        allocateNewPage(size);
>-        return malloc(size);
>-    }
>-
>-    template<typename T>
>-    T* malloc()
>-    {
>-        return reinterpret_cast<T*>(malloc(sizeof(T)).buffer());
>-    }
>-
>-    ptrdiff_t offsetOf(const void* address)
>-    {
>-        ptrdiff_t offset;
>-        ptrdiff_t baseOffset = 0;
>-        for (const auto& page : m_pages) {
>-            if (page.getOffset(address, offset))
>-                return baseOffset + offset;
>-            baseOffset += page.size();
>-        }
>-        RELEASE_ASSERT_NOT_REACHED();
>-        return 0;
>-    }
>-
>-    void cachePtr(const void* ptr, ptrdiff_t offset)
>-    {
>-        m_ptrToOffsetMap.add(ptr, offset);
>-    }
>-
>-    WTF::Optional<ptrdiff_t> offsetForPtr(const void* ptr)
>-    {
>-        auto it = m_ptrToOffsetMap.find(ptr);
>-        if (it == m_ptrToOffsetMap.end())
>-            return WTF::nullopt;
>-        return { it->value };
>-    }
>-
>-    std::pair<MallocPtr<uint8_t>, size_t> release()
>-    {
>-        size_t size = m_baseOffset + m_currentPage->size();
>-        MallocPtr<uint8_t> buffer = MallocPtr<uint8_t>::malloc(size);
>-        unsigned offset = 0;
>-        for (const auto& page : m_pages) {
>-            memcpy(buffer.get() + offset, page.buffer(), page.size());
>-            offset += page.size();
>-        }
>-        RELEASE_ASSERT(offset == size);
>-        return { WTFMove(buffer), size };
>-    }
>-
>-private:
>-    class Page {
>-    public:
>-        Page(size_t size)
>-            : m_offset(0)
>-            , m_capacity(size)
>-        {
>-            m_buffer = MallocPtr<uint8_t>::malloc(size);
>-        }
>-
>-        bool malloc(size_t size, ptrdiff_t& result)
>-        {
>-            size_t alignment = std::min(alignof(std::max_align_t), static_cast<size_t>(WTF::roundUpToPowerOfTwo(size)));
>-            ptrdiff_t offset = WTF::roundUpToMultipleOf(alignment, m_offset);
>-            size = WTF::roundUpToMultipleOf(alignment, size);
>-            if (static_cast<size_t>(offset + size) > m_capacity)
>-                return false;
>-
>-            result = offset;
>-            m_offset = offset + size;
>-            return true;
>-        }
>-
>-        uint8_t* buffer() const { return m_buffer.get(); }
>-        size_t size() const { return static_cast<size_t>(m_offset); }
>-
>-        bool getOffset(const void* address, ptrdiff_t& result) const
>-        {
>-            const uint8_t* addr = static_cast<const uint8_t*>(address);
>-            if (addr >= m_buffer.get() && addr < m_buffer.get() + m_offset) {
>-                result = addr - m_buffer.get();
>-                return true;
>-            }
>-            return false;
>-        }
>-
>-    private:
>-        MallocPtr<uint8_t> m_buffer;
>-        ptrdiff_t m_offset;
>-        size_t m_capacity;
>-    };
>-
>-    void allocateNewPage(size_t size = 0)
>-    {
>-        static size_t minPageSize = WTF::pageSize();
>-        if (m_currentPage)
>-            m_baseOffset += m_currentPage->size();
>-        if (size < minPageSize)
>-            size = minPageSize;
>-        else
>-            size = WTF::roundUpToMultipleOf(minPageSize, size);
>-        m_pages.append(Page { size });
>-        m_currentPage = &m_pages.last();
>-    }
>-
>-    VM& m_vm;
>-    ptrdiff_t m_baseOffset;
>-    Page* m_currentPage;
>-    Vector<Page> m_pages;
>-    HashMap<const void*, ptrdiff_t> m_ptrToOffsetMap;
>-};
>-
>-class Decoder {
>-    WTF_MAKE_NONCOPYABLE(Decoder);
>-    WTF_FORBID_HEAP_ALLOCATION;
>-
>-public:
>-    Decoder(VM& vm, const void* baseAddress, size_t size)
>-        : m_vm(vm)
>-        , m_baseAddress(reinterpret_cast<const uint8_t*>(baseAddress))
>-#ifndef NDEBUG
>-        , m_size(size)
>-#endif
>-    {
>-        UNUSED_PARAM(size);
>-    }
>-
>-    ~Decoder()
>-    {
>-        for (auto& pair : m_finalizers)
>-            pair.value();
>-    }
>-
>-    VM& vm() { return m_vm; }
>-
>-    ptrdiff_t offsetOf(const void* ptr)
>-    {
>-        const uint8_t* addr = static_cast<const uint8_t*>(ptr);
>-        ASSERT(addr >= m_baseAddress && addr < m_baseAddress + m_size);
>-        return addr - m_baseAddress;
>-    }
>-
>-    void cacheOffset(ptrdiff_t offset, void* ptr)
>-    {
>-        m_offsetToPtrMap.add(offset, ptr);
>-    }
>-
>-    WTF::Optional<void*> ptrForOffset(ptrdiff_t offset)
>-    {
>-        auto it = m_offsetToPtrMap.find(offset);
>-        if (it == m_offsetToPtrMap.end())
>-            return WTF::nullopt;
>-        return { it->value };
>-    }
>-
>-    template<typename Functor>
>-    void addFinalizer(ptrdiff_t offset, const Functor& fn)
>-    {
>-        m_finalizers.add(offset, fn);
>-    }
>-
>-private:
>-    VM& m_vm;
>-    const uint8_t* m_baseAddress;
>-#ifndef NDEBUG
>-    size_t m_size;
>-#endif
>-    HashMap<ptrdiff_t, void*> m_offsetToPtrMap;
>-    HashMap<ptrdiff_t, std::function<void()>> m_finalizers;
>-};
>-
>-template<typename T>
>-static std::enable_if_t<std::is_same<T, SourceType<T>>::value> encode(Encoder&, T& dst, const SourceType<T>& src)
>-{
>-    dst = src;
>-}
>-
>-template<typename T>
>-static std::enable_if_t<!std::is_same<T, SourceType<T>>::value> encode(Encoder& encoder, T& dst, const SourceType<T>& src)
>-{
>-    dst.encode(encoder, src);
>-}
>-
>-template<typename T, typename... Args>
>-static std::enable_if_t<std::is_same<T, SourceType<T>>::value> decode(Decoder&, const T& src, SourceType<T>& dst, Args...)
>-{
>-    dst = src;
>-}
>-
>-template<typename T, typename... Args>
>-static std::enable_if_t<!std::is_same<T, SourceType<T>>::value> decode(Decoder& decoder, const T& src, SourceType<T>& dst, Args... args)
>-{
>-    src.decode(decoder, dst, args...);
>-}
>-
>-template<typename T>
>-static std::enable_if_t<std::is_same<T, SourceType<T>>::value, T> decode(Decoder&, T src)
>-{
>-    return src;
>-}
>-
>-template<typename T>
>-static std::enable_if_t<!std::is_same<T, SourceType<T>>::value, SourceType<T>>&& decode(Decoder& decoder, const T& src)
>-{
>-    return src.decode(decoder);
>-}
>-
>-template<typename Source>
>-class CachedObject {
>-    WTF_MAKE_NONCOPYABLE(CachedObject<Source>);
>-    WTF_FORBID_HEAP_ALLOCATION;
>-
>-public:
>-    using SourceType_ = Source;
>-};
>-
>-template<typename Source>
>-class VariableLengthObject : public CachedObject<Source> {
>-    template<typename, typename>
>-    friend struct CachedPtr;
>-
>-protected:
>-    const uint8_t* buffer() const
>-    {
>-        ASSERT(m_offset != s_invalidOffset);
>-        return reinterpret_cast<const uint8_t*>(this) + m_offset;
>-    }
>-
>-    template<typename T>
>-    const T* buffer() const
>-    {
>-        return reinterpret_cast<const T*>(buffer());
>-    }
>-
>-    uint8_t* allocate(Encoder& encoder, size_t size)
>-    {
>-        if (!size)
>-            return nullptr;
>-
>-        ptrdiff_t offsetOffset = encoder.offsetOf(&m_offset);
>-        auto result = encoder.malloc(size);
>-        m_offset = result.offset() - offsetOffset;
>-        return result.buffer();
>-    }
>-
>-    template<typename T>
>-    T* allocate(Encoder& encoder, unsigned size = 1)
>-    {
>-        uint8_t* result = allocate(encoder, sizeof(T) * size);
>-        return reinterpret_cast<T*>(result);
>-    }
>-
>-private:
>-    constexpr static ptrdiff_t s_invalidOffset = std::numeric_limits<ptrdiff_t>::max();
>-
>-    ptrdiff_t m_offset { s_invalidOffset };
>-
>-};
>-
>-template<typename T, typename Source = SourceType<T>>
>-class CachedPtr : public VariableLengthObject<Source*> {
>-    template<typename, typename>
>-    friend struct CachedRefPtr;
>-
>-public:
>-    void encode(Encoder& encoder, const Source* src)
>-    {
>-        m_isEmpty = !src;
>-        if (m_isEmpty)
>-            return;
>-
>-        if (WTF::Optional<ptrdiff_t> offset = encoder.offsetForPtr(src)) {
>-            this->m_offset = *offset - encoder.offsetOf(&this->m_offset);
>-            return;
>-        }
>-
>-        T* cachedObject = this->template allocate<T>(encoder);
>-        cachedObject->encode(encoder, *src);
>-        encoder.cachePtr(src, encoder.offsetOf(cachedObject));
>-    }
>-
>-    template<typename... Args>
>-    Source* decode(Decoder& decoder, Args... args) const
>-    {
>-        if (m_isEmpty)
>-            return nullptr;
>-
>-        ptrdiff_t bufferOffset = decoder.offsetOf(this->buffer());
>-        if (WTF::Optional<void*> ptr = decoder.ptrForOffset(bufferOffset))
>-            return reinterpret_cast<Source*>(*ptr);
>-
>-        Source* ptr = get()->decode(decoder, args...);
>-        decoder.cacheOffset(bufferOffset, ptr);
>-        return ptr;
>-    }
>-
>-    const T* operator->() const { return get(); }
>-
>-private:
>-    const T* get() const
>-    {
>-        if (m_isEmpty)
>-            return nullptr;
>-        return this->template buffer<T>();
>-    }
>-
>-    bool m_isEmpty;
>-
>-};
>-
>-template<typename T, typename Source = SourceType<T>>
>-class CachedRefPtr : public CachedObject<RefPtr<Source>> {
>-public:
>-    void encode(Encoder& encoder, const Source* src)
>-    {
>-        m_ptr.encode(encoder, src);
>-    }
>-
>-    void encode(Encoder& encoder, const RefPtr<Source> src)
>-    {
>-        encode(encoder, src.get());
>-    }
>-
>-    RefPtr<Source> decode(Decoder& decoder) const
>-    {
>-        Source* decodedPtr = m_ptr.decode(decoder);
>-        if (!decodedPtr)
>-            return nullptr;
>-        decoder.addFinalizer(decoder.offsetOf(m_ptr.buffer()), [=] { derefIfNotNull(decodedPtr); });
>-        refIfNotNull(decodedPtr);
>-        return adoptRef(decodedPtr);
>-    }
>-
>-    void decode(Decoder& decoder, RefPtr<Source>& src) const
>-    {
>-        src = decode(decoder);
>-    }
>-
>-private:
>-    CachedPtr<T, Source> m_ptr;
>-};
>-
>-template<typename T, typename Source = SourceType<T>>
>-class CachedWriteBarrier : public CachedObject<WriteBarrier<Source>> {
>-public:
>-    void encode(Encoder& encoder, const WriteBarrier<Source> src)
>-    {
>-        m_ptr.encode(encoder, src.get());
>-    }
>-
>-    void decode(Decoder& decoder, WriteBarrier<Source>& src, const JSCell* owner) const
>-    {
>-        Source* decodedPtr = m_ptr.decode(decoder);
>-        if (decodedPtr)
>-            src.set(decoder.vm(), owner, decodedPtr);
>-    }
>-
>-private:
>-    CachedPtr<T, Source> m_ptr;
>-};
>-
>-template<typename T, size_t InlineCapacity = 0, typename OverflowHandler = CrashOnOverflow>
>-class CachedVector : public VariableLengthObject<Vector<SourceType<T>, InlineCapacity, OverflowHandler>> {
>-public:
>-    void encode(Encoder& encoder, const Vector<SourceType<T>, InlineCapacity, OverflowHandler>& vector)
>-    {
>-        m_size = vector.size();
>-        T* buffer = this->template allocate<T>(encoder, m_size);
>-        for (unsigned i = 0; i < m_size; ++i)
>-            ::JSC::encode(encoder, buffer[i], vector[i]);
>-    }
>-
>-    template<typename... Args>
>-    void decode(Decoder& decoder, Vector<SourceType<T>, InlineCapacity, OverflowHandler>& vector, Args... args) const
>-    {
>-        vector.resizeToFit(m_size);
>-        const T* buffer = this->template buffer<T>();
>-        for (unsigned i = 0; i < m_size; ++i)
>-            ::JSC::decode(decoder, buffer[i], vector[i], args...);
>-    }
>-
>-private:
>-    unsigned m_size;
>-};
>-
>-template<typename First, typename Second>
>-class CachedPair : public CachedObject<std::pair<SourceType<First>, SourceType<Second>>> {
>-public:
>-    void encode(Encoder& encoder, const std::pair<SourceType<First>, SourceType<Second>>& pair)
>-    {
>-        ::JSC::encode(encoder, m_first, pair.first);
>-        ::JSC::encode(encoder, m_second, pair.second);
>-    }
>-
>-    void decode(Decoder& decoder, std::pair<SourceType<First>, SourceType<Second>>& pair) const
>-    {
>-        ::JSC::decode(decoder, m_first, pair.first);
>-        ::JSC::decode(decoder, m_second, pair.second);
>-    }
>-
>-private:
>-    First m_first;
>-    Second m_second;
>-};
>-
>-template<typename Key, typename Value, typename HashArg = typename DefaultHash<SourceType<Key>>::Hash, typename KeyTraitsArg = HashTraits<SourceType<Key>>, typename MappedTraitsArg = HashTraits<SourceType<Value>>>
>-class CachedHashMap : public VariableLengthObject<HashMap<SourceType<Key>, SourceType<Value>, HashArg, KeyTraitsArg, MappedTraitsArg>> {
>-    template<typename K, typename V>
>-    using Map = HashMap<K, V, HashArg, KeyTraitsArg, MappedTraitsArg>;
>-
>-public:
>-    void encode(Encoder& encoder, const Map<SourceType<Key>, SourceType<Value>>& map)
>-    {
>-        SourceType<decltype(m_entries)> entriesVector(map.size());
>-        unsigned i = 0;
>-        for (const auto& it : map)
>-            entriesVector[i++] = { it.key, it.value };
>-        m_entries.encode(encoder, entriesVector);
>-    }
>-
>-    void decode(Decoder& decoder, Map<SourceType<Key>, SourceType<Value>>& map) const
>-    {
>-        SourceType<decltype(m_entries)> decodedEntries;
>-        m_entries.decode(decoder, decodedEntries);
>-        for (const auto& pair : decodedEntries)
>-            map.set(pair.first, pair.second);
>-    }
>-
>-private:
>-    CachedVector<CachedPair<Key, Value>> m_entries;
>-};
>-
>-class CachedUniquedStringImpl : public VariableLengthObject<UniquedStringImpl> {
>-public:
>-    void encode(Encoder& encoder, const StringImpl& string)
>-    {
>-        m_isAtomic = string.isAtomic();
>-        m_isSymbol = string.isSymbol();
>-        StringImpl* impl = const_cast<StringImpl*>(&string);
>-        if (m_isSymbol) {
>-            SymbolImpl* symbol = static_cast<SymbolImpl*>(impl);
>-            if (!symbol->isNullSymbol()) {
>-                Identifier uid = Identifier::fromUid(&encoder.vm(), symbol);
>-                impl = encoder.vm().propertyNames->lookUpPublicName(uid).string().impl();
>-            }
>-        }
>-
>-        m_is8Bit = impl->is8Bit();
>-        m_length = impl->length();
>-
>-        if (!m_length)
>-            return;
>-
>-        unsigned size = m_length;
>-        const void* payload;
>-        if (m_is8Bit)
>-            payload = impl->characters8();
>-        else {
>-            payload = impl->characters16();
>-            size *= 2;
>-        }
>-
>-        uint8_t* buffer = this->allocate(encoder, size);
>-        memcpy(buffer, payload, size);
>-    }
>-
>-    UniquedStringImpl* decode(Decoder& decoder) const
>-    {
>-        auto create = [&](const auto* buffer) -> UniquedStringImpl* {
>-            if (!m_isSymbol)
>-                return AtomicStringImpl::add(buffer, m_length).leakRef();
>-
>-            if (!m_length)
>-                return &SymbolImpl::createNullSymbol().leakRef();
>-
>-            Identifier ident = Identifier::fromString(&decoder.vm(), buffer, m_length);
>-            String str = decoder.vm().propertyNames->lookUpPrivateName(ident)->string();
>-            StringImpl* impl = str.releaseImpl().get();
>-            ASSERT(impl->isSymbol());
>-            return static_cast<UniquedStringImpl*>(impl);
>-        };
>-
>-        if (m_is8Bit)
>-            return create(this->buffer<LChar>());
>-        return create(this->buffer<UChar>());
>-    }
>-
>-private:
>-    bool m_is8Bit : 1;
>-    bool m_isSymbol : 1;
>-    bool m_isAtomic : 1;
>-    unsigned m_length;
>-};
>-
>-class CachedStringImpl : public VariableLengthObject<StringImpl> {
>-public:
>-    void encode(Encoder& encoder, const StringImpl& impl)
>-    {
>-        m_uniquedStringImpl.encode(encoder, impl);
>-    }
>-
>-    StringImpl* decode(Decoder& decoder) const
>-    {
>-        return m_uniquedStringImpl.decode(decoder);
>-    }
>-
>-private:
>-    CachedUniquedStringImpl m_uniquedStringImpl;
>-};
>-
>-class CachedString : public VariableLengthObject<String> {
>-public:
>-    void encode(Encoder& encoder, const String& string)
>-    {
>-        m_impl.encode(encoder, static_cast<UniquedStringImpl*>(string.impl()));
>-    }
>-
>-    String decode(Decoder& decoder) const
>-    {
>-        return String(static_cast<RefPtr<StringImpl>>(m_impl.decode(decoder)));
>-    }
>-
>-    void decode(Decoder& decoder, String& dst) const
>-    {
>-        dst = decode(decoder);
>-    }
>-
>-private:
>-    CachedRefPtr<CachedUniquedStringImpl> m_impl;
>-};
>-
>-class CachedIdentifier : public VariableLengthObject<Identifier> {
>-public:
>-    void encode(Encoder& encoder, const Identifier& identifier)
>-    {
>-        m_string.encode(encoder, identifier.string());
>-    }
>-
>-    Identifier decode(Decoder& decoder) const
>-    {
>-        String str = m_string.decode(decoder);
>-        if (str.isNull())
>-            return Identifier();
>-
>-        return Identifier::fromUid(&decoder.vm(), (UniquedStringImpl*)str.impl());
>-    }
>-
>-    void decode(Decoder& decoder, Identifier& ident) const
>-    {
>-        ident = decode(decoder);
>-    }
>-
>-private:
>-    CachedString m_string;
>-};
>-
>-template<typename T>
>-class CachedOptional : public VariableLengthObject<WTF::Optional<SourceType<T>>> {
>-public:
>-    void encode(Encoder& encoder, const WTF::Optional<SourceType<T>>& source)
>-    {
>-        m_isEmpty = !source;
>-
>-        if (m_isEmpty)
>-            return;
>-
>-        this->template allocate<T>(encoder)->encode(encoder, *source);
>-    }
>-
>-    WTF::Optional<SourceType<T>> decode(Decoder& decoder) const
>-    {
>-        if (m_isEmpty)
>-            return WTF::nullopt;
>-
>-        return { this->template buffer<T>()->decode(decoder) };
>-    }
>-
>-    void decode(Decoder& decoder, WTF::Optional<SourceType<T>>& dst) const
>-    {
>-        dst = decode(decoder);
>-    }
>-
>-    void encode(Encoder& encoder, const std::unique_ptr<SourceType<T>>& source)
>-    {
>-        if (!source)
>-            encode(encoder, WTF::nullopt);
>-        else
>-            encode(encoder, { *source });
>-    }
>-
>-    SourceType<T>* decodeAsPtr(Decoder& decoder) const
>-    {
>-        if (m_isEmpty)
>-            return nullptr;
>-
>-        return this->template buffer<T>()->decode(decoder);
>-    }
>-
>-private:
>-    bool m_isEmpty;
>-};
>-
>-class CachedSimpleJumpTable : public CachedObject<UnlinkedSimpleJumpTable> {
>-public:
>-    void encode(Encoder& encoder, const UnlinkedSimpleJumpTable& jumpTable)
>-    {
>-        m_min = jumpTable.min;
>-        m_branchOffsets.encode(encoder, jumpTable.branchOffsets);
>-    }
>-
>-    void decode(Decoder& decoder, UnlinkedSimpleJumpTable& jumpTable) const
>-    {
>-        jumpTable.min = m_min;
>-        m_branchOffsets.decode(decoder, jumpTable.branchOffsets);
>-    }
>-
>-private:
>-    int32_t m_min;
>-    CachedVector<int32_t> m_branchOffsets;
>-};
>-
>-class CachedStringJumpTable : public CachedObject<UnlinkedStringJumpTable> {
>-public:
>-    void encode(Encoder& encoder, const UnlinkedStringJumpTable& jumpTable)
>-    {
>-        m_offsetTable.encode(encoder, jumpTable.offsetTable);
>-    }
>-
>-    void decode(Decoder& decoder, UnlinkedStringJumpTable& jumpTable) const
>-    {
>-        m_offsetTable.decode(decoder, jumpTable.offsetTable);
>-    }
>-
>-private:
>-    CachedHashMap<CachedRefPtr<CachedStringImpl>, UnlinkedStringJumpTable:: OffsetLocation> m_offsetTable;
>-};
>-
>-class CachedCodeBlockRareData : public CachedObject<UnlinkedCodeBlock::RareData> {
>-public:
>-    void encode(Encoder& encoder, const UnlinkedCodeBlock::RareData& rareData)
>-    {
>-        m_exceptionHandlers.encode(encoder, rareData.m_exceptionHandlers);
>-        m_switchJumpTables.encode(encoder, rareData.m_switchJumpTables);
>-        m_stringSwitchJumpTables.encode(encoder, rareData.m_stringSwitchJumpTables);
>-        m_expressionInfoFatPositions.encode(encoder, rareData.m_expressionInfoFatPositions);
>-        m_typeProfilerInfoMap.encode(encoder, rareData.m_typeProfilerInfoMap);
>-        m_opProfileControlFlowBytecodeOffsets.encode(encoder, rareData.m_opProfileControlFlowBytecodeOffsets);
>-    }
>-
>-    UnlinkedCodeBlock::RareData* decode(Decoder& decoder) const
>-    {
>-        UnlinkedCodeBlock::RareData* rareData = new UnlinkedCodeBlock::RareData { };
>-        m_exceptionHandlers.decode(decoder, rareData->m_exceptionHandlers);
>-        m_switchJumpTables.decode(decoder, rareData->m_switchJumpTables);
>-        m_stringSwitchJumpTables.decode(decoder, rareData->m_stringSwitchJumpTables);
>-        m_expressionInfoFatPositions.decode(decoder, rareData->m_expressionInfoFatPositions);
>-        m_typeProfilerInfoMap.decode(decoder, rareData->m_typeProfilerInfoMap);
>-        m_opProfileControlFlowBytecodeOffsets.decode(decoder, rareData->m_opProfileControlFlowBytecodeOffsets);
>-        return rareData;
>-    }
>-
>-private:
>-    CachedVector<UnlinkedHandlerInfo> m_exceptionHandlers;
>-    CachedVector<CachedSimpleJumpTable> m_switchJumpTables;
>-    CachedVector<CachedStringJumpTable> m_stringSwitchJumpTables;
>-    CachedVector<ExpressionRangeInfo::FatPosition> m_expressionInfoFatPositions;
>-    CachedHashMap<unsigned, UnlinkedCodeBlock::RareData::TypeProfilerExpressionRange> m_typeProfilerInfoMap;
>-    CachedVector<InstructionStream::Offset> m_opProfileControlFlowBytecodeOffsets;
>-};
>-
>-class CachedBitVector : public VariableLengthObject<BitVector> {
>-public:
>-    void encode(Encoder& encoder, const BitVector& bitVector)
>-    {
>-        m_size = bitVector.size();
>-        uint8_t* buffer = this->allocate(encoder, m_size);
>-        memcpy(buffer, bitVector.bits(), m_size);
>-    }
>-
>-    void decode(Decoder&, BitVector& bitVector) const
>-    {
>-        bitVector.ensureSize(m_size);
>-        memcpy(bitVector.bits(), this->buffer(), m_size);
>-    }
>-
>-private:
>-    unsigned m_size;
>-};
>-
>-template<typename T, typename HashArg = typename DefaultHash<T>::Hash>
>-class CachedHashSet : public CachedObject<HashSet<SourceType<T>, HashArg>> {
>-public:
>-    void encode(Encoder& encoder, const HashSet<SourceType<T>, HashArg>& set)
>-    {
>-        SourceType<decltype(m_entries)> entriesVector(set.size());
>-        unsigned i = 0;
>-        for (const auto& item : set)
>-            entriesVector[i++] = item;
>-        m_entries.encode(encoder, entriesVector);
>-    }
>-
>-    void decode(Decoder& decoder, HashSet<SourceType<T>, HashArg>& set) const
>-    {
>-        SourceType<decltype(m_entries)> entriesVector;
>-        m_entries.decode(decoder, entriesVector);
>-        for (const auto& item : entriesVector)
>-            set.add(item);
>-    }
>-
>-private:
>-    CachedVector<T> m_entries;
>-};
>-
>-class CachedConstantIdentifierSetEntry : public VariableLengthObject<ConstantIdentifierSetEntry> {
>-public:
>-    void encode(Encoder& encoder, const ConstantIdentifierSetEntry& entry)
>-    {
>-        m_constant = entry.second;
>-        m_set.encode(encoder, entry.first);
>-    }
>-
>-    void decode(Decoder& decoder, ConstantIdentifierSetEntry& entry) const
>-    {
>-        entry.second = m_constant;
>-        m_set.decode(decoder, entry.first);
>-    }
>-
>-private:
>-    unsigned m_constant;
>-    CachedHashSet<CachedRefPtr<CachedUniquedStringImpl>, IdentifierRepHash> m_set;
>-};
>-
>-class CachedVariableEnvironment : public CachedObject<VariableEnvironment> {
>-public:
>-    void encode(Encoder& encoder, const VariableEnvironment& env)
>-    {
>-        m_isEverythingCaptured = env.m_isEverythingCaptured;
>-        m_map.encode(encoder, env.m_map);
>-    }
>-
>-    void decode(Decoder& decoder, VariableEnvironment& env) const
>-    {
>-        env.m_isEverythingCaptured = m_isEverythingCaptured;
>-        m_map.decode(decoder, env.m_map);
>-    }
>-
>-private:
>-    bool m_isEverythingCaptured;
>-    CachedHashMap<CachedRefPtr<CachedUniquedStringImpl>, VariableEnvironmentEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>, VariableEnvironmentEntryHashTraits> m_map;
>-};
>-
>-template<typename T, typename Source = SourceType<T>>
>-class CachedArray : public VariableLengthObject<Source*> {
>-public:
>-    void encode(Encoder& encoder, const Source* array, unsigned size)
>-    {
>-        T* dst = this->template allocate<T>(encoder, size);
>-        for (unsigned i = 0; i < size; ++i)
>-            ::JSC::encode(encoder, dst[i], array[i]);
>-    }
>-
>-    template<typename... Args>
>-    void decode(Decoder& decoder, Source* array, unsigned size, Args... args) const
>-    {
>-        const T* buffer = this->template buffer<T>();
>-        for (unsigned i = 0; i < size; ++i)
>-            ::JSC::decode(decoder, buffer[i], array[i], args...);
>-    }
>-};
>-
>-class CachedScopedArgumentsTable : public CachedObject<ScopedArgumentsTable> {
>-public:
>-    void encode(Encoder& encoder, const ScopedArgumentsTable& scopedArgumentsTable)
>-    {
>-        m_length = scopedArgumentsTable.m_length;
>-        m_arguments.encode(encoder, scopedArgumentsTable.m_arguments.get(), m_length);
>-    }
>-
>-    ScopedArgumentsTable* decode(Decoder& decoder) const
>-    {
>-        ScopedArgumentsTable* scopedArgumentsTable = ScopedArgumentsTable::create(decoder.vm(), m_length);
>-        m_arguments.decode(decoder, scopedArgumentsTable->m_arguments.get(), m_length);
>-        return scopedArgumentsTable;
>-    }
>-
>-private:
>-    uint32_t m_length;
>-    CachedArray<ScopeOffset> m_arguments;
>-};
>-
>-class CachedSymbolTableEntry : public CachedObject<SymbolTableEntry> {
>-public:
>-    void encode(Encoder&, const SymbolTableEntry& symbolTableEntry)
>-    {
>-        m_bits = symbolTableEntry.m_bits | SymbolTableEntry::SlimFlag;
>-    }
>-
>-    void decode(Decoder&, SymbolTableEntry& symbolTableEntry) const
>-    {
>-        symbolTableEntry.m_bits = m_bits;
>-    }
>-
>-private:
>-    intptr_t m_bits;
>-};
>-
>-class CachedSymbolTable : public CachedObject<SymbolTable> {
>-public:
>-    void encode(Encoder& encoder, const SymbolTable& symbolTable)
>-    {
>-        ASSERT(!symbolTable.m_rareData);
>-        m_map.encode(encoder, symbolTable.m_map);
>-        m_maxScopeOffset = symbolTable.m_maxScopeOffset;
>-        m_usesNonStrictEval = symbolTable.m_usesNonStrictEval;
>-        m_nestedLexicalScope = symbolTable.m_nestedLexicalScope;
>-        m_scopeType = symbolTable.m_scopeType;
>-        m_arguments.encode(encoder, symbolTable.m_arguments.get());
>-    }
>-
>-    SymbolTable* decode(Decoder& decoder) const
>-    {
>-        SymbolTable* symbolTable = SymbolTable::create(decoder.vm());
>-        m_map.decode(decoder, symbolTable->m_map);
>-        symbolTable->m_maxScopeOffset = m_maxScopeOffset;
>-        symbolTable->m_usesNonStrictEval = m_usesNonStrictEval;
>-        symbolTable->m_nestedLexicalScope = m_nestedLexicalScope;
>-        symbolTable->m_scopeType = m_scopeType;
>-        ScopedArgumentsTable* scopedArgumentsTable = m_arguments.decode(decoder);
>-        if (scopedArgumentsTable)
>-            symbolTable->m_arguments.set(decoder.vm(), symbolTable, scopedArgumentsTable);
>-        return symbolTable;
>-    }
>-
>-private:
>-    CachedHashMap<CachedRefPtr<CachedUniquedStringImpl>, CachedSymbolTableEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>, SymbolTableIndexHashTraits> m_map;
>-    ScopeOffset m_maxScopeOffset;
>-    unsigned m_usesNonStrictEval : 1;
>-    unsigned m_nestedLexicalScope : 1;
>-    unsigned m_scopeType : 3;
>-    // FIXME: do we need to cached this eventually?
>-    // CachedPtr<SymbolTableRareData> rareData;
>-    CachedPtr<CachedScopedArgumentsTable> m_arguments;
>-};
>-
>-class CachedJSValue;
>-class CachedImmutableButterfly : public CachedObject<JSImmutableButterfly> {
>-public:
>-    void encode(Encoder& encoder, JSImmutableButterfly& immutableButterfly)
>-    {
>-        m_length = immutableButterfly.length();
>-        m_indexingType = immutableButterfly.indexingTypeAndMisc();
>-        if (hasDouble(m_indexingType))
>-            m_cachedDoubles.encode(encoder, immutableButterfly.toButterfly()->contiguousDouble().data(), m_length);
>-        else
>-            m_cachedValues.encode(encoder, immutableButterfly.toButterfly()->contiguous().data(), m_length);
>-    }
>-
>-    JSImmutableButterfly* decode(Decoder& decoder) const
>-    {
>-        JSImmutableButterfly* immutableButterfly = JSImmutableButterfly::create(decoder.vm(), m_indexingType, m_length);
>-        if (hasDouble(m_indexingType))
>-            m_cachedDoubles.decode(decoder, immutableButterfly->toButterfly()->contiguousDouble().data(), m_length, immutableButterfly);
>-        else
>-            m_cachedValues.decode(decoder, immutableButterfly->toButterfly()->contiguous().data(), m_length, immutableButterfly);
>-        return immutableButterfly;
>-    }
>-
>-private:
>-    IndexingType m_indexingType;
>-    unsigned m_length;
>-    union {
>-        CachedArray<double> m_cachedDoubles;
>-        CachedArray<CachedJSValue, WriteBarrier<Unknown>> m_cachedValues;
>-    };
>-};
>-
>-class CachedRegExp : public CachedObject<RegExp> {
>-public:
>-    void encode(Encoder& encoder, const RegExp& regExp)
>-    {
>-        m_patternString.encode(encoder, regExp.m_patternString);
>-        m_flags = regExp.m_flags;
>-    }
>-
>-    RegExp* decode(Decoder& decoder) const
>-    {
>-        String pattern { m_patternString.decode(decoder) };
>-        return RegExp::create(decoder.vm(), pattern, m_flags);
>-    }
>-
>-private:
>-    CachedString m_patternString;
>-    RegExpFlags m_flags;
>-};
>-
>-class CachedTemplateObjectDescriptor : public CachedObject<TemplateObjectDescriptor> {
>-public:
>-    void encode(Encoder& encoder, const TemplateObjectDescriptor& templateObjectDescriptor)
>-    {
>-        m_rawStrings.encode(encoder, templateObjectDescriptor.rawStrings());
>-        m_cookedStrings.encode(encoder, templateObjectDescriptor.cookedStrings());
>-    }
>-
>-    Ref<TemplateObjectDescriptor> decode(Decoder& decoder) const
>-    {
>-        TemplateObjectDescriptor::StringVector decodedRawStrings;
>-        TemplateObjectDescriptor::OptionalStringVector decodedCookedStrings;
>-        m_rawStrings.decode(decoder, decodedRawStrings);
>-        m_cookedStrings.decode(decoder, decodedCookedStrings);
>-        return TemplateObjectDescriptor::create(WTFMove(decodedRawStrings), WTFMove(decodedCookedStrings));
>-    }
>-
>-private:
>-    CachedVector<CachedString, 4> m_rawStrings;
>-    CachedVector<CachedOptional<CachedString>, 4> m_cookedStrings;
>-};
>-
>-class CachedBigInt : public VariableLengthObject<JSBigInt> {
>-public:
>-    void encode(Encoder& encoder, JSBigInt& bigInt)
>-    {
>-        m_length = bigInt.length();
>-        m_sign = bigInt.sign();
>-
>-        if (!m_length)
>-            return;
>-
>-        unsigned size = sizeof(JSBigInt::Digit) * m_length;
>-        uint8_t* buffer = this->allocate(encoder, size);
>-        memcpy(buffer, bigInt.dataStorage(), size);
>-    }
>-
>-    JSBigInt* decode(Decoder& decoder) const
>-    {
>-        JSBigInt* bigInt = JSBigInt::createWithLengthUnchecked(decoder.vm(), m_length);
>-        bigInt->setSign(m_sign);
>-        memcpy(bigInt->dataStorage(), this->buffer(), sizeof(JSBigInt::Digit) * m_length);
>-        return bigInt;
>-    }
>-
>-private:
>-    unsigned m_length;
>-    bool m_sign;
>-};
>-
>-class CachedJSValue : public VariableLengthObject<WriteBarrier<Unknown>> {
>-public:
>-    void encode(Encoder& encoder, const WriteBarrier<Unknown> value)
>-    {
>-        JSValue v = value.get();
>-
>-        if (!v.isCell() || v.isEmpty()) {
>-            m_type = EncodedType::JSValue;
>-            *this->allocate<EncodedJSValue>(encoder) = JSValue::encode(v);
>-            return;
>-        }
>-
>-        JSCell* cell = v.asCell();
>-        VM& vm = encoder.vm();
>-
>-        if (auto* symbolTable = jsDynamicCast<SymbolTable*>(vm, cell)) {
>-            m_type = EncodedType::SymbolTable;
>-            this->allocate<CachedSymbolTable>(encoder)->encode(encoder, *symbolTable);
>-            return;
>-        }
>-
>-        if (auto* string = jsDynamicCast<JSString*>(vm, cell)) {
>-            m_type = EncodedType::String;
>-            StringImpl* impl = string->tryGetValue().impl();
>-            this->allocate<CachedUniquedStringImpl>(encoder)->encode(encoder, *impl);
>-            return;
>-        }
>-
>-        if (auto* immutableButterfly = jsDynamicCast<JSImmutableButterfly*>(vm, cell)) {
>-            m_type = EncodedType::ImmutableButterfly;
>-            this->allocate<CachedImmutableButterfly>(encoder)->encode(encoder, *immutableButterfly);
>-            return;
>-        }
>-
>-        if (auto* regexp = jsDynamicCast<RegExp*>(vm, cell)) {
>-            m_type = EncodedType::RegExp;
>-            this->allocate<CachedRegExp>(encoder)->encode(encoder, *regexp);
>-            return;
>-        }
>-
>-        if (auto* templateObjectDescriptor = jsDynamicCast<JSTemplateObjectDescriptor*>(vm, cell)) {
>-            m_type = EncodedType::TemplateObjectDescriptor;
>-            this->allocate<CachedTemplateObjectDescriptor>(encoder)->encode(encoder, templateObjectDescriptor->descriptor());
>-            return;
>-        }
>-
>-        if (auto* bigInt = jsDynamicCast<JSBigInt*>(vm, cell)) {
>-            m_type = EncodedType::BigInt;
>-            this->allocate<CachedBigInt>(encoder)->encode(encoder, *bigInt);
>-            return;
>-        }
>-
>-        RELEASE_ASSERT_NOT_REACHED();
>-    }
>-
>-    void decode(Decoder& decoder, WriteBarrier<Unknown>& value, const JSCell* owner) const
>-    {
>-        JSValue v;
>-        switch (m_type) {
>-        case EncodedType::JSValue:
>-            v = JSValue::decode(*this->buffer<EncodedJSValue>());
>-            break;
>-        case EncodedType::SymbolTable:
>-            v = this->buffer<CachedSymbolTable>()->decode(decoder);
>-            break;
>-        case EncodedType::String: {
>-            UniquedStringImpl* impl = this->buffer<CachedUniquedStringImpl>()->decode(decoder);
>-            v = JSString::create(decoder.vm(), adoptRef(*impl));
>-            break;
>-        }
>-        case EncodedType::ImmutableButterfly:
>-            v = this->buffer<CachedImmutableButterfly>()->decode(decoder);
>-            break;
>-        case EncodedType::RegExp:
>-            v = this->buffer<CachedRegExp>()->decode(decoder);
>-            break;
>-        case EncodedType::TemplateObjectDescriptor:
>-            v = JSTemplateObjectDescriptor::create(decoder.vm(), this->buffer<CachedTemplateObjectDescriptor>()->decode(decoder));
>-            break;
>-        case EncodedType::BigInt:
>-            v = this->buffer<CachedBigInt>()->decode(decoder);
>-            break;
>-        default:
>-            RELEASE_ASSERT_NOT_REACHED();
>-        }
>-        value.set(decoder.vm(), owner, v);
>-    }
>-
>-private:
>-    enum class EncodedType : uint8_t {
>-        JSValue,
>-        SymbolTable,
>-        String,
>-        ImmutableButterfly,
>-        RegExp,
>-        TemplateObjectDescriptor,
>-        BigInt,
>-    };
>-
>-    EncodedType m_type;
>-};
>-
>-class CachedInstructionStream : public CachedObject<InstructionStream> {
>-public:
>-    void encode(Encoder& encoder, const InstructionStream& stream)
>-    {
>-        m_instructions.encode(encoder, stream.m_instructions);
>-    }
>-
>-    InstructionStream* decode(Decoder& decoder) const
>-    {
>-        Vector<uint8_t, 0, UnsafeVectorOverflow> instructionsVector;
>-        m_instructions.decode(decoder, instructionsVector);
>-        return new InstructionStream(WTFMove(instructionsVector));
>-    }
>-
>-private:
>-    CachedVector<uint8_t, 0, UnsafeVectorOverflow> m_instructions;
>-};
>-
>-class CachedMetadataTable : public CachedObject<UnlinkedMetadataTable> {
>-public:
>-    void encode(Encoder&, const UnlinkedMetadataTable& metadataTable)
>-    {
>-        ASSERT(metadataTable.m_isFinalized);
>-        m_hasMetadata = metadataTable.m_hasMetadata;
>-        if (!m_hasMetadata)
>-            return;
>-        for (unsigned i = UnlinkedMetadataTable::s_offsetTableEntries; i--;)
>-            m_metadata[i] = metadataTable.buffer()[i];
>-    }
>-
>-    void decode(Decoder&, UnlinkedMetadataTable& metadataTable) const
>-    {
>-        metadataTable.m_isFinalized = true;
>-        metadataTable.m_isLinked = false;
>-        metadataTable.m_hasMetadata = m_hasMetadata;
>-        for (unsigned i = UnlinkedMetadataTable::s_offsetTableEntries; i--;)
>-            metadataTable.buffer()[i] = m_metadata[i];
>-    }
>-
>-private:
>-    bool m_hasMetadata;
>-    std::array<unsigned, UnlinkedMetadataTable::s_offsetTableEntries> m_metadata;
>-};
>-
>-class CachedSourceOrigin : public CachedObject<SourceOrigin> {
>-public:
>-    void encode(Encoder& encoder, const SourceOrigin& sourceOrigin)
>-    {
>-        m_string.encode(encoder, sourceOrigin.string());
>-    }
>-
>-    SourceOrigin decode(Decoder& decoder) const
>-    {
>-        return SourceOrigin { m_string.decode(decoder) };
>-    }
>-
>-private:
>-    CachedString m_string;
>-};
>-
>-class CachedTextPosition : public CachedObject<TextPosition> {
>-public:
>-    void encode(Encoder&, TextPosition textPosition)
>-    {
>-        m_line = textPosition.m_line.zeroBasedInt();
>-        m_column = textPosition.m_column.zeroBasedInt();
>-    }
>-
>-    TextPosition decode(Decoder&) const
>-    {
>-        return TextPosition { OrdinalNumber::fromZeroBasedInt(m_line), OrdinalNumber::fromZeroBasedInt(m_column) };
>-    }
>-
>-private:
>-    int m_line;
>-    int m_column;
>-};
>-
>-template <typename Source, typename CachedType>
>-class CachedSourceProviderShape : public CachedObject<Source> {
>-public:
>-    void encode(Encoder& encoder, const SourceProvider& sourceProvider)
>-    {
>-        m_validated = sourceProvider.isValid();
>-        m_sourceOrigin.encode(encoder, sourceProvider.sourceOrigin());
>-        m_url.encode(encoder, sourceProvider.url());
>-        m_sourceURLDirective.encode(encoder, sourceProvider.sourceURL());
>-        m_sourceMappingURLDirective.encode(encoder, sourceProvider.sourceMappingURL());
>-        m_startPosition.encode(encoder, sourceProvider.startPosition());
>-    }
>-
>-    void decode(Decoder& decoder, SourceProvider& sourceProvider) const
>-    {
>-        if (m_validated)
>-            sourceProvider.setValid();
>-        sourceProvider.setSourceURLDirective(m_sourceURLDirective.decode(decoder));
>-        sourceProvider.setSourceMappingURLDirective(m_sourceMappingURLDirective.decode(decoder));
>-    }
>-
>-protected:
>-    bool m_validated : 1;
>-    CachedSourceOrigin m_sourceOrigin;
>-    CachedString m_url;
>-    CachedString m_sourceURLDirective;
>-    CachedString m_sourceMappingURLDirective;
>-    CachedTextPosition m_startPosition;
>-};
>-
>-class CachedStringSourceProvider : public CachedSourceProviderShape<StringSourceProvider, CachedStringSourceProvider> {
>-    using Base = CachedSourceProviderShape<StringSourceProvider, CachedStringSourceProvider>;
>-
>-public:
>-    void encode(Encoder& encoder, const StringSourceProvider& sourceProvider)
>-    {
>-        Base::encode(encoder, sourceProvider);
>-        m_source.encode(encoder, sourceProvider.source().toString());
>-    }
>-
>-    StringSourceProvider* decode(Decoder& decoder, SourceProviderSourceType sourceType) const
>-    {
>-        String decodedSource = m_source.decode(decoder);
>-        SourceOrigin decodedSourceOrigin = m_sourceOrigin.decode(decoder);
>-        String decodedURL = m_url.decode(decoder);
>-        TextPosition decodedStartPosition = m_startPosition.decode(decoder);
>-
>-        Ref<StringSourceProvider> sourceProvider = StringSourceProvider::create(decodedSource, decodedSourceOrigin, URL(URL(), decodedURL), decodedStartPosition, sourceType);
>-        Base::decode(decoder, sourceProvider.get());
>-        return &sourceProvider.leakRef();
>-    }
>-
>-private:
>-    CachedString m_source;
>-};
>-
>-#if ENABLE(WEBASSEMBLY)
>-class CachedWebAssemblySourceProvider : public CachedSourceProviderShape<WebAssemblySourceProvider, CachedWebAssemblySourceProvider> {
>-    using Base = CachedSourceProviderShape<WebAssemblySourceProvider, CachedWebAssemblySourceProvider>;
>-
>-public:
>-    void encode(Encoder& encoder, const WebAssemblySourceProvider& sourceProvider)
>-    {
>-        Base::encode(encoder, sourceProvider);
>-        m_data.encode(encoder, sourceProvider.data());
>-    }
>-
>-    WebAssemblySourceProvider* decode(Decoder& decoder) const
>-    {
>-        Vector<uint8_t> decodedData;
>-        SourceOrigin decodedSourceOrigin = m_sourceOrigin.decode(decoder);
>-        String decodedURL = m_url.decode(decoder);
>-
>-        m_data.decode(decoder, decodedData);
>-
>-        Ref<WebAssemblySourceProvider> sourceProvider = WebAssemblySourceProvider::create(WTFMove(decodedData), decodedSourceOrigin, URL(URL(), decodedURL));
>-        Base::decode(decoder, sourceProvider.get());
>-
>-        return &sourceProvider.leakRef();
>-    }
>-
>-private:
>-    CachedVector<uint8_t> m_data;
>-};
>-#endif
>-
>-class CachedSourceProvider : public VariableLengthObject<SourceProvider> {
>-public:
>-    void encode(Encoder& encoder, const SourceProvider& sourceProvider)
>-    {
>-        m_sourceType = sourceProvider.sourceType();
>-        switch (m_sourceType) {
>-        case SourceProviderSourceType::Program:
>-        case SourceProviderSourceType::Module:
>-            this->allocate<CachedStringSourceProvider>(encoder)->encode(encoder, reinterpret_cast<const StringSourceProvider&>(sourceProvider));
>-            break;
>-#if ENABLE(WEBASSEMBLY)
>-        case SourceProviderSourceType::WebAssembly:
>-            this->allocate<CachedWebAssemblySourceProvider>(encoder)->encode(encoder, reinterpret_cast<const WebAssemblySourceProvider&>(sourceProvider));
>-            break;
>-#endif
>-        default:
>-            RELEASE_ASSERT_NOT_REACHED();
>-        }
>-    }
>-
>-    SourceProvider* decode(Decoder& decoder) const
>-    {
>-        switch (m_sourceType) {
>-        case SourceProviderSourceType::Program:
>-        case SourceProviderSourceType::Module:
>-            return this->buffer<CachedStringSourceProvider>()->decode(decoder, m_sourceType);
>-#if ENABLE(WEBASSEMBLY)
>-        case SourceProviderSourceType::WebAssembly:
>-            return this->buffer<CachedWebAssemblySourceProvider>()->decode(decoder);
>-#endif
>-        default:
>-            RELEASE_ASSERT_NOT_REACHED();
>-        }
>-    }
>-
>-private:
>-    SourceProviderSourceType m_sourceType;
>-};
>-
>-template<typename Source>
>-class CachedUnlinkedSourceCodeShape : public CachedObject<Source> {
>-public:
>-    void encode(Encoder& encoder, const UnlinkedSourceCode& sourceCode)
>-    {
>-        m_provider.encode(encoder, sourceCode.m_provider.get());
>-        m_startOffset = sourceCode.startOffset();
>-        m_endOffset = sourceCode.endOffset();
>-    }
>-
>-    void decode(Decoder& decoder, UnlinkedSourceCode& sourceCode) const
>-    {
>-        sourceCode.m_provider = m_provider.decode(decoder);
>-        sourceCode.m_startOffset = m_startOffset;
>-        sourceCode.m_endOffset = m_endOffset;
>-    }
>-
>-private:
>-    CachedPtr<CachedSourceProvider> m_provider;
>-    int m_startOffset;
>-    int m_endOffset;
>-};
>-
>-
>-class CachedUnlinkedSourceCode : public CachedUnlinkedSourceCodeShape<UnlinkedSourceCode> { };
>-
>-class CachedSourceCode : public CachedUnlinkedSourceCodeShape<SourceCode> {
>-    using Base = CachedUnlinkedSourceCodeShape<SourceCode>;
>-
>-public:
>-    void encode(Encoder& encoder, const SourceCode& sourceCode)
>-    {
>-        Base::encode(encoder, sourceCode);
>-        m_firstLine = sourceCode.firstLine().zeroBasedInt();
>-        m_startColumn = sourceCode.startColumn().zeroBasedInt();
>-    }
>-
>-    void decode(Decoder& decoder, SourceCode& sourceCode) const
>-    {
>-        Base::decode(decoder, sourceCode);
>-        sourceCode.m_firstLine = OrdinalNumber::fromZeroBasedInt(m_firstLine);
>-        sourceCode.m_startColumn = OrdinalNumber::fromZeroBasedInt(m_startColumn);
>-    }
>-
>-private:
>-    int m_firstLine;
>-    int m_startColumn;
>-};
>-
>-class CachedFunctionExecutable : public CachedObject<UnlinkedFunctionExecutable> {
>-public:
>-    void encode(Encoder&, const UnlinkedFunctionExecutable&);
>-    UnlinkedFunctionExecutable* decode(Decoder&) const;
>-
>-    unsigned firstLineOffset() const { return m_firstLineOffset; }
>-    unsigned lineCount() const { return m_lineCount; }
>-    unsigned unlinkedFunctionNameStart() const { return m_unlinkedFunctionNameStart; }
>-    unsigned unlinkedBodyStartColumn() const { return m_unlinkedBodyStartColumn; }
>-    unsigned unlinkedBodyEndColumn() const { return m_unlinkedBodyEndColumn; }
>-    unsigned startOffset() const { return m_startOffset; }
>-    unsigned sourceLength() const { return m_sourceLength; }
>-    unsigned parametersStartOffset() const { return m_parametersStartOffset; }
>-    unsigned typeProfilingStartOffset() const { return m_typeProfilingStartOffset; }
>-    unsigned typeProfilingEndOffset() const { return m_typeProfilingEndOffset; }
>-    unsigned parameterCount() const { return m_parameterCount; }
>-
>-    CodeFeatures features() const { return m_features; }
>-    SourceParseMode sourceParseMode() const { return m_sourceParseMode; }
>-
>-    unsigned isInStrictContext() const { return m_isInStrictContext; }
>-    unsigned hasCapturedVariables() const { return m_hasCapturedVariables; }
>-    unsigned isBuiltinFunction() const { return m_isBuiltinFunction; }
>-    unsigned isBuiltinDefaultClassConstructor() const { return m_isBuiltinDefaultClassConstructor; }
>-    unsigned constructAbility() const { return m_constructAbility; }
>-    unsigned constructorKind() const { return m_constructorKind; }
>-    unsigned functionMode() const { return m_functionMode; }
>-    unsigned scriptMode() const { return m_scriptMode; }
>-    unsigned superBinding() const { return m_superBinding; }
>-    unsigned derivedContextType() const { return m_derivedContextType; }
>-
>-    Identifier name(Decoder& decoder) const { return m_name.decode(decoder); }
>-    Identifier ecmaName(Decoder& decoder) const { return m_ecmaName.decode(decoder); }
>-    Identifier inferredName(Decoder& decoder) const { return m_inferredName.decode(decoder); }
>-
>-private:
>-    unsigned m_firstLineOffset;
>-    unsigned m_lineCount;
>-    unsigned m_unlinkedFunctionNameStart;
>-    unsigned m_unlinkedBodyStartColumn;
>-    unsigned m_unlinkedBodyEndColumn;
>-    unsigned m_startOffset;
>-    unsigned m_sourceLength;
>-    unsigned m_parametersStartOffset;
>-    unsigned m_typeProfilingStartOffset;
>-    unsigned m_typeProfilingEndOffset;
>-    unsigned m_parameterCount;
>-    CodeFeatures m_features;
>-    SourceParseMode m_sourceParseMode;
>-    unsigned m_isInStrictContext : 1;
>-    unsigned m_hasCapturedVariables : 1;
>-    unsigned m_isBuiltinFunction : 1;
>-    unsigned m_isBuiltinDefaultClassConstructor : 1;
>-    unsigned m_constructAbility: 1;
>-    unsigned m_constructorKind : 2;
>-    unsigned m_functionMode : 2; // FunctionMode
>-    unsigned m_scriptMode: 1; // JSParserScriptMode
>-    unsigned m_superBinding : 1;
>-    unsigned m_derivedContextType: 2;
>-
>-    CachedSourceCode m_classSource;
>-
>-    CachedIdentifier m_name;
>-    CachedIdentifier m_ecmaName;
>-    CachedIdentifier m_inferredName;
>-
>-    CachedVariableEnvironment m_parentScopeTDZVariables;
>-
>-    CachedWriteBarrier<CachedFunctionCodeBlock, UnlinkedFunctionCodeBlock> m_unlinkedCodeBlockForCall;
>-    CachedWriteBarrier<CachedFunctionCodeBlock, UnlinkedFunctionCodeBlock> m_unlinkedCodeBlockForConstruct;
>-};
>-
>-template<typename CodeBlockType>
>-class CachedCodeBlock : public CachedObject<CodeBlockType> {
>-public:
>-    void encode(Encoder&, const UnlinkedCodeBlock&);
>-    void decode(Decoder&, UnlinkedCodeBlock&) const;
>-
>-    InstructionStream* instructions(Decoder& decoder) const { return m_instructions.decode(decoder); }
>-
>-    VirtualRegister thisRegister() const { return m_thisRegister; }
>-    VirtualRegister scopeRegister() const { return m_scopeRegister; }
>-    VirtualRegister globalObjectRegister() const { return m_globalObjectRegister; }
>-
>-    String sourceURLDirective(Decoder& decoder) const { return m_sourceURLDirective.decode(decoder); }
>-    String sourceMappingURLDirective(Decoder& decoder) const { return m_sourceMappingURLDirective.decode(decoder); }
>-
>-    unsigned usesEval() const { return m_usesEval; }
>-    unsigned isStrictMode() const { return m_isStrictMode; }
>-    unsigned isConstructor() const { return m_isConstructor; }
>-    unsigned hasCapturedVariables() const { return m_hasCapturedVariables; }
>-    unsigned isBuiltinFunction() const { return m_isBuiltinFunction; }
>-    unsigned superBinding() const { return m_superBinding; }
>-    unsigned scriptMode() const { return m_scriptMode; }
>-    unsigned isArrowFunctionContext() const { return m_isArrowFunctionContext; }
>-    unsigned isClassContext() const { return m_isClassContext; }
>-    unsigned wasCompiledWithDebuggingOpcodes() const { return m_wasCompiledWithDebuggingOpcodes; }
>-    unsigned constructorKind() const { return m_constructorKind; }
>-    unsigned derivedContextType() const { return m_derivedContextType; }
>-    unsigned evalContextType() const { return m_evalContextType; }
>-    unsigned hasTailCalls() const { return m_hasTailCalls; }
>-    unsigned lineCount() const { return m_lineCount; }
>-    unsigned endColumn() const { return m_endColumn; }
>-
>-    int numVars() const { return m_numVars; }
>-    int numCalleeLocals() const { return m_numCalleeLocals; }
>-    int numParameters() const { return m_numParameters; }
>-
>-    CodeFeatures features() const { return m_features; }
>-    SourceParseMode parseMode() const { return m_parseMode; }
>-    CodeType codeType() const { return m_codeType; }
>-
>-    UnlinkedCodeBlock::RareData* rareData(Decoder& decoder) const { return m_rareData.decodeAsPtr(decoder); }
>-
>-private:
>-    VirtualRegister m_thisRegister;
>-    VirtualRegister m_scopeRegister;
>-    VirtualRegister m_globalObjectRegister;
>-
>-    unsigned m_usesEval : 1;
>-    unsigned m_isStrictMode : 1;
>-    unsigned m_isConstructor : 1;
>-    unsigned m_hasCapturedVariables : 1;
>-    unsigned m_isBuiltinFunction : 1;
>-    unsigned m_superBinding : 1;
>-    unsigned m_scriptMode: 1;
>-    unsigned m_isArrowFunctionContext : 1;
>-    unsigned m_isClassContext : 1;
>-    unsigned m_wasCompiledWithDebuggingOpcodes : 1;
>-    unsigned m_constructorKind : 2;
>-    unsigned m_derivedContextType : 2;
>-    unsigned m_evalContextType : 2;
>-    unsigned m_hasTailCalls : 1;
>-
>-    unsigned m_lineCount;
>-    unsigned m_endColumn;
>-
>-    int m_numVars;
>-    int m_numCalleeLocals;
>-    int m_numParameters;
>-
>-    CodeFeatures m_features;
>-    SourceParseMode m_parseMode;
>-    CodeType m_codeType;
>-
>-    std::array<unsigned, LinkTimeConstantCount> m_linkTimeConstants;
>-    CachedMetadataTable m_metadata;
>-
>-    CachedOptional<CachedCodeBlockRareData> m_rareData;
>-
>-    CachedString m_sourceURLDirective;
>-    CachedString m_sourceMappingURLDirective;
>-
>-    CachedPtr<CachedInstructionStream> m_instructions;
>-    CachedVector<InstructionStream::Offset> m_jumpTargets;
>-    CachedVector<InstructionStream::Offset> m_propertyAccessInstructions;
>-    CachedVector<CachedJSValue> m_constantRegisters;
>-    CachedVector<SourceCodeRepresentation> m_constantsSourceCodeRepresentation;
>-    CachedVector<ExpressionRangeInfo> m_expressionInfo;
>-    CachedHashMap<InstructionStream::Offset, int> m_outOfLineJumpTargets;
>-
>-    CachedVector<CachedConstantIdentifierSetEntry> m_constantIdentifierSets;
>-    CachedVector<CachedIdentifier> m_identifiers;
>-    CachedVector<CachedBitVector> m_bitVectors;
>-    CachedVector<CachedWriteBarrier<CachedFunctionExecutable>> m_functionDecls;
>-    CachedVector<CachedWriteBarrier<CachedFunctionExecutable>> m_functionExprs;
>-};
>-
>-class CachedProgramCodeBlock : public CachedCodeBlock<UnlinkedProgramCodeBlock> {
>-    using Base = CachedCodeBlock<UnlinkedProgramCodeBlock>;
>-
>-public:
>-    void encode(Encoder& encoder, const UnlinkedProgramCodeBlock& codeBlock)
>-    {
>-        Base::encode(encoder, codeBlock);
>-        m_varDeclarations.encode(encoder, codeBlock.m_varDeclarations);
>-        m_lexicalDeclarations.encode(encoder, codeBlock.m_lexicalDeclarations);
>-    }
>-
>-    UnlinkedProgramCodeBlock* decode(Decoder& decoder) const
>-    {
>-        UnlinkedProgramCodeBlock* codeBlock = new (NotNull, allocateCell<UnlinkedProgramCodeBlock>(decoder.vm().heap)) UnlinkedProgramCodeBlock(decoder, *this);
>-        codeBlock->finishCreation(decoder.vm());
>-        Base::decode(decoder, *codeBlock);
>-        m_varDeclarations.decode(decoder, codeBlock->m_varDeclarations);
>-        m_lexicalDeclarations.decode(decoder, codeBlock->m_lexicalDeclarations);
>-        return codeBlock;
>-    }
>-
>-private:
>-    CachedVariableEnvironment m_varDeclarations;
>-    CachedVariableEnvironment m_lexicalDeclarations;
>-};
>-
>-class CachedModuleCodeBlock : public CachedCodeBlock<UnlinkedModuleProgramCodeBlock> {
>-    using Base = CachedCodeBlock<UnlinkedModuleProgramCodeBlock>;
>-
>-public:
>-    void encode(Encoder& encoder, const UnlinkedModuleProgramCodeBlock& codeBlock)
>-    {
>-        Base::encode(encoder, codeBlock);
>-        m_moduleEnvironmentSymbolTableConstantRegisterOffset = codeBlock.m_moduleEnvironmentSymbolTableConstantRegisterOffset;
>-    }
>-
>-    UnlinkedModuleProgramCodeBlock* decode(Decoder& decoder) const
>-    {
>-        UnlinkedModuleProgramCodeBlock* codeBlock = new (NotNull, allocateCell<UnlinkedModuleProgramCodeBlock>(decoder.vm().heap)) UnlinkedModuleProgramCodeBlock(decoder, *this);
>-        codeBlock->finishCreation(decoder.vm());
>-        Base::decode(decoder, *codeBlock);
>-        codeBlock->m_moduleEnvironmentSymbolTableConstantRegisterOffset = m_moduleEnvironmentSymbolTableConstantRegisterOffset;
>-        return codeBlock;
>-    }
>-
>-private:
>-    int m_moduleEnvironmentSymbolTableConstantRegisterOffset;
>-};
>-
>-class CachedEvalCodeBlock : public CachedCodeBlock<UnlinkedEvalCodeBlock> {
>-    using Base = CachedCodeBlock<UnlinkedEvalCodeBlock>;
>-
>-public:
>-    void encode(Encoder& encoder, const UnlinkedEvalCodeBlock& codeBlock)
>-    {
>-        Base::encode(encoder, codeBlock);
>-        m_variables.encode(encoder, codeBlock.m_variables);
>-        m_functionHoistingCandidates.encode(encoder, codeBlock.m_functionHoistingCandidates);
>-    }
>-
>-    UnlinkedEvalCodeBlock* decode(Decoder& decoder) const
>-    {
>-        UnlinkedEvalCodeBlock* codeBlock = new (NotNull, allocateCell<UnlinkedEvalCodeBlock>(decoder.vm().heap)) UnlinkedEvalCodeBlock(decoder, *this);
>-        codeBlock->finishCreation(decoder.vm());
>-        Base::decode(decoder, *codeBlock);
>-        m_variables.decode(decoder, codeBlock->m_variables);
>-        m_functionHoistingCandidates.decode(decoder, codeBlock->m_functionHoistingCandidates);
>-        return codeBlock;
>-    }
>-
>-private:
>-    CachedVector<CachedIdentifier, 0, UnsafeVectorOverflow> m_variables;
>-    CachedVector<CachedIdentifier, 0, UnsafeVectorOverflow> m_functionHoistingCandidates;
>-};
>-
>-class CachedFunctionCodeBlock : public CachedCodeBlock<UnlinkedFunctionCodeBlock> {
>-    using Base = CachedCodeBlock<UnlinkedFunctionCodeBlock>;
>-
>-public:
>-    void encode(Encoder& encoder, const UnlinkedFunctionCodeBlock& codeBlock)
>-    {
>-        Base::encode(encoder, codeBlock);
>-    }
>-
>-    UnlinkedFunctionCodeBlock* decode(Decoder& decoder) const
>-    {
>-        UnlinkedFunctionCodeBlock* codeBlock = new (NotNull, allocateCell<UnlinkedFunctionCodeBlock>(decoder.vm().heap)) UnlinkedFunctionCodeBlock(decoder, *this);
>-        codeBlock->finishCreation(decoder.vm());
>-        Base::decode(decoder, *codeBlock);
>-        return codeBlock;
>-    }
>-};
>-
>-ALWAYS_INLINE UnlinkedFunctionCodeBlock::UnlinkedFunctionCodeBlock(Decoder& decoder, const CachedFunctionCodeBlock& cachedCodeBlock)
>-    : Base(decoder, decoder.vm().unlinkedFunctionCodeBlockStructure.get(), cachedCodeBlock)
>-{
>-}
>-
>-template<typename T>
>-struct CachedCodeBlockTypeImpl;
>-
>-enum CachedCodeBlockTag {
>-    CachedProgramCodeBlockTag,
>-    CachedModuleCodeBlockTag,
>-    CachedEvalCodeBlockTag,
>-};
>-
>-template<>
>-struct CachedCodeBlockTypeImpl<UnlinkedProgramCodeBlock> {
>-    using type = CachedProgramCodeBlock;
>-    static constexpr CachedCodeBlockTag tag = CachedProgramCodeBlockTag;
>-};
>-
>-template<>
>-struct CachedCodeBlockTypeImpl<UnlinkedModuleProgramCodeBlock> {
>-    using type = CachedModuleCodeBlock;
>-    static constexpr CachedCodeBlockTag tag = CachedModuleCodeBlockTag;
>-};
>-
>-template<>
>-struct CachedCodeBlockTypeImpl<UnlinkedEvalCodeBlock> {
>-    using type = CachedEvalCodeBlock;
>-    static constexpr CachedCodeBlockTag tag = CachedEvalCodeBlockTag;
>-};
>-
>-template<typename T>
>-using CachedCodeBlockType = typename CachedCodeBlockTypeImpl<T>::type;
>-
>-template<typename CodeBlockType>
>-ALWAYS_INLINE UnlinkedCodeBlock::UnlinkedCodeBlock(Decoder& decoder, Structure* structure, const CachedCodeBlock<CodeBlockType>& cachedCodeBlock)
>-    : Base(decoder.vm(), structure)
>-    , m_instructions(cachedCodeBlock.instructions(decoder))
>-    , m_liveness(nullptr)
>-    , m_thisRegister(cachedCodeBlock.thisRegister())
>-    , m_scopeRegister(cachedCodeBlock.scopeRegister())
>-    , m_globalObjectRegister(cachedCodeBlock.globalObjectRegister())
>-
>-    , m_sourceURLDirective(cachedCodeBlock.sourceURLDirective(decoder))
>-    , m_sourceMappingURLDirective(cachedCodeBlock.sourceMappingURLDirective(decoder))
>-
>-    , m_usesEval(cachedCodeBlock.usesEval())
>-    , m_isStrictMode(cachedCodeBlock.isStrictMode())
>-    , m_isConstructor(cachedCodeBlock.isConstructor())
>-    , m_hasCapturedVariables(cachedCodeBlock.hasCapturedVariables())
>-    , m_isBuiltinFunction(cachedCodeBlock.isBuiltinFunction())
>-    , m_superBinding(cachedCodeBlock.superBinding())
>-    , m_scriptMode(cachedCodeBlock.scriptMode())
>-    , m_isArrowFunctionContext(cachedCodeBlock.isArrowFunctionContext())
>-    , m_isClassContext(cachedCodeBlock.isClassContext())
>-    , m_wasCompiledWithDebuggingOpcodes(cachedCodeBlock.wasCompiledWithDebuggingOpcodes())
>-    , m_constructorKind(cachedCodeBlock.constructorKind())
>-    , m_derivedContextType(cachedCodeBlock.derivedContextType())
>-    , m_evalContextType(cachedCodeBlock.evalContextType())
>-    , m_hasTailCalls(cachedCodeBlock.hasTailCalls())
>-    , m_lineCount(cachedCodeBlock.lineCount())
>-    , m_endColumn(cachedCodeBlock.endColumn())
>-    , m_numVars(cachedCodeBlock.numVars())
>-    , m_numCalleeLocals(cachedCodeBlock.numCalleeLocals())
>-    , m_numParameters(cachedCodeBlock.numParameters())
>-    , m_features(cachedCodeBlock.features())
>-    , m_parseMode(cachedCodeBlock.parseMode())
>-    , m_codeType(cachedCodeBlock.codeType())
>-    , m_rareData(cachedCodeBlock.rareData(decoder))
>-{
>-}
>-
>-template<typename CodeBlockType>
>-ALWAYS_INLINE void CachedCodeBlock<CodeBlockType>::decode(Decoder& decoder, UnlinkedCodeBlock& codeBlock) const
>-{
>-    for (unsigned i = LinkTimeConstantCount; i--;)
>-        codeBlock.m_linkTimeConstants[i] = m_linkTimeConstants[i];
>-
>-    m_metadata.decode(decoder, codeBlock.m_metadata);
>-    m_propertyAccessInstructions.decode(decoder, codeBlock.m_propertyAccessInstructions);
>-    m_constantRegisters.decode(decoder, codeBlock.m_constantRegisters, &codeBlock);
>-    m_constantsSourceCodeRepresentation.decode(decoder, codeBlock.m_constantsSourceCodeRepresentation);
>-    m_expressionInfo.decode(decoder, codeBlock.m_expressionInfo);
>-    m_outOfLineJumpTargets.decode(decoder, codeBlock.m_outOfLineJumpTargets);
>-    m_jumpTargets.decode(decoder, codeBlock.m_jumpTargets);
>-    m_constantIdentifierSets.decode(decoder, codeBlock.m_constantIdentifierSets);
>-    m_identifiers.decode(decoder, codeBlock.m_identifiers);
>-    m_bitVectors.decode(decoder, codeBlock.m_bitVectors);
>-    m_functionDecls.decode(decoder, codeBlock.m_functionDecls, &codeBlock);
>-    m_functionExprs.decode(decoder, codeBlock.m_functionExprs, &codeBlock);
>-}
>-
>-ALWAYS_INLINE UnlinkedProgramCodeBlock::UnlinkedProgramCodeBlock(Decoder& decoder, const CachedProgramCodeBlock& cachedCodeBlock)
>-    : Base(decoder, decoder.vm().unlinkedProgramCodeBlockStructure.get(), cachedCodeBlock)
>-{
>-}
>-
>-ALWAYS_INLINE UnlinkedModuleProgramCodeBlock::UnlinkedModuleProgramCodeBlock(Decoder& decoder, const CachedModuleCodeBlock& cachedCodeBlock)
>-    : Base(decoder, decoder.vm().unlinkedModuleProgramCodeBlockStructure.get(), cachedCodeBlock)
>-{
>-}
>-
>-ALWAYS_INLINE UnlinkedEvalCodeBlock::UnlinkedEvalCodeBlock(Decoder& decoder, const CachedEvalCodeBlock& cachedCodeBlock)
>-    : Base(decoder, decoder.vm().unlinkedEvalCodeBlockStructure.get(), cachedCodeBlock)
>-{
>-}
>-
>-ALWAYS_INLINE void CachedFunctionExecutable::encode(Encoder& encoder, const UnlinkedFunctionExecutable& executable)
>-{
>-    m_firstLineOffset = executable.m_firstLineOffset;
>-    m_lineCount = executable.m_lineCount;
>-    m_unlinkedFunctionNameStart = executable.m_unlinkedFunctionNameStart;
>-    m_unlinkedBodyStartColumn = executable.m_unlinkedBodyStartColumn;
>-    m_unlinkedBodyEndColumn = executable.m_unlinkedBodyEndColumn;
>-    m_startOffset = executable.m_startOffset;
>-    m_sourceLength = executable.m_sourceLength;
>-    m_parametersStartOffset = executable.m_parametersStartOffset;
>-    m_typeProfilingStartOffset = executable.m_typeProfilingStartOffset;
>-    m_typeProfilingEndOffset = executable.m_typeProfilingEndOffset;
>-    m_parameterCount = executable.m_parameterCount;
>-
>-    m_features = executable.m_features;
>-    m_sourceParseMode = executable.m_sourceParseMode;
>-
>-    m_isInStrictContext = executable.m_isInStrictContext;
>-    m_hasCapturedVariables = executable.m_hasCapturedVariables;
>-    m_isBuiltinFunction = executable.m_isBuiltinFunction;
>-    m_isBuiltinDefaultClassConstructor = executable.m_isBuiltinDefaultClassConstructor;
>-    m_constructAbility = executable.m_constructAbility;
>-    m_constructorKind = executable.m_constructorKind;
>-    m_functionMode = executable.m_functionMode;
>-    m_scriptMode = executable.m_scriptMode;
>-    m_superBinding = executable.m_superBinding;
>-    m_derivedContextType = executable.m_derivedContextType;
>-
>-    m_classSource.encode(encoder, executable.m_classSource);
>-
>-    m_name.encode(encoder, executable.name());
>-    m_ecmaName.encode(encoder, executable.ecmaName());
>-    m_inferredName.encode(encoder, executable.inferredName());
>-
>-    m_parentScopeTDZVariables.encode(encoder, executable.parentScopeTDZVariables());
>-
>-    m_unlinkedCodeBlockForCall.encode(encoder, executable.m_unlinkedCodeBlockForCall);
>-    m_unlinkedCodeBlockForConstruct.encode(encoder, executable.m_unlinkedCodeBlockForConstruct);
>-}
>-
>-ALWAYS_INLINE UnlinkedFunctionExecutable* CachedFunctionExecutable::decode(Decoder& decoder) const
>-{
>-    VariableEnvironment env;
>-    m_parentScopeTDZVariables.decode(decoder, env);
>-
>-    UnlinkedFunctionExecutable* executable = new (NotNull, allocateCell<UnlinkedFunctionExecutable>(decoder.vm().heap)) UnlinkedFunctionExecutable(decoder, env, *this);
>-    executable->finishCreation(decoder.vm());
>-
>-    m_classSource.decode(decoder, executable->m_classSource);
>-    m_unlinkedCodeBlockForCall.decode(decoder, executable->m_unlinkedCodeBlockForCall, executable);
>-    m_unlinkedCodeBlockForConstruct.decode(decoder, executable->m_unlinkedCodeBlockForConstruct, executable);
>-
>-    return executable;
>-}
>-
>-ALWAYS_INLINE UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(Decoder& decoder, VariableEnvironment& parentScopeTDZVariables, const CachedFunctionExecutable& cachedExecutable)
>-    : Base(decoder.vm(), decoder.vm().unlinkedFunctionExecutableStructure.get())
>-    , m_firstLineOffset(cachedExecutable.firstLineOffset())
>-    , m_lineCount(cachedExecutable.lineCount())
>-    , m_unlinkedFunctionNameStart(cachedExecutable.unlinkedFunctionNameStart())
>-    , m_unlinkedBodyStartColumn(cachedExecutable.unlinkedBodyStartColumn())
>-    , m_unlinkedBodyEndColumn(cachedExecutable.unlinkedBodyEndColumn())
>-    , m_startOffset(cachedExecutable.startOffset())
>-    , m_sourceLength(cachedExecutable.sourceLength())
>-    , m_parametersStartOffset(cachedExecutable.parametersStartOffset())
>-    , m_typeProfilingStartOffset(cachedExecutable.typeProfilingStartOffset())
>-    , m_typeProfilingEndOffset(cachedExecutable.typeProfilingEndOffset())
>-    , m_parameterCount(cachedExecutable.parameterCount())
>-    , m_features(cachedExecutable.features())
>-    , m_sourceParseMode(cachedExecutable.sourceParseMode())
>-    , m_isInStrictContext(cachedExecutable.isInStrictContext())
>-    , m_hasCapturedVariables(cachedExecutable.hasCapturedVariables())
>-    , m_isBuiltinFunction(cachedExecutable.isBuiltinFunction())
>-    , m_isBuiltinDefaultClassConstructor(cachedExecutable.isBuiltinDefaultClassConstructor())
>-    , m_constructAbility(cachedExecutable.constructAbility())
>-    , m_constructorKind(cachedExecutable.constructorKind())
>-    , m_functionMode(cachedExecutable.functionMode())
>-    , m_scriptMode(cachedExecutable.scriptMode())
>-    , m_superBinding(cachedExecutable.superBinding())
>-    , m_derivedContextType(cachedExecutable.derivedContextType())
>-
>-    , m_name(cachedExecutable.name(decoder))
>-    , m_ecmaName(cachedExecutable.ecmaName(decoder))
>-    , m_inferredName(cachedExecutable.inferredName(decoder))
>-
>-    , m_parentScopeTDZVariables(decoder.vm().m_compactVariableMap->get(parentScopeTDZVariables))
>-{
>-}
>-
>-template<typename CodeBlockType>
>-ALWAYS_INLINE void CachedCodeBlock<CodeBlockType>::encode(Encoder& encoder, const UnlinkedCodeBlock& codeBlock)
>-{
>-    m_thisRegister = codeBlock.m_thisRegister;
>-    m_scopeRegister = codeBlock.m_scopeRegister;
>-    m_globalObjectRegister = codeBlock.m_globalObjectRegister;
>-    m_usesEval = codeBlock.m_usesEval;
>-    m_isStrictMode = codeBlock.m_isStrictMode;
>-    m_isConstructor = codeBlock.m_isConstructor;
>-    m_hasCapturedVariables = codeBlock.m_hasCapturedVariables;
>-    m_isBuiltinFunction = codeBlock.m_isBuiltinFunction;
>-    m_superBinding = codeBlock.m_superBinding;
>-    m_scriptMode = codeBlock.m_scriptMode;
>-    m_isArrowFunctionContext = codeBlock.m_isArrowFunctionContext;
>-    m_isClassContext = codeBlock.m_isClassContext;
>-    m_wasCompiledWithDebuggingOpcodes = codeBlock.m_wasCompiledWithDebuggingOpcodes;
>-    m_constructorKind = codeBlock.m_constructorKind;
>-    m_derivedContextType = codeBlock.m_derivedContextType;
>-    m_evalContextType = codeBlock.m_evalContextType;
>-    m_hasTailCalls = codeBlock.m_hasTailCalls;
>-    m_lineCount = codeBlock.m_lineCount;
>-    m_endColumn = codeBlock.m_endColumn;
>-    m_numVars = codeBlock.m_numVars;
>-    m_numCalleeLocals = codeBlock.m_numCalleeLocals;
>-    m_numParameters = codeBlock.m_numParameters;
>-    m_features = codeBlock.m_features;
>-    m_parseMode = codeBlock.m_parseMode;
>-    m_codeType = codeBlock.m_codeType;
>-
>-    for (unsigned i = LinkTimeConstantCount; i--;)
>-        m_linkTimeConstants[i] = codeBlock.m_linkTimeConstants[i];
>-
>-    m_metadata.encode(encoder, codeBlock.m_metadata);
>-    m_rareData.encode(encoder, codeBlock.m_rareData);
>-
>-    m_sourceURLDirective.encode(encoder, codeBlock.m_sourceURLDirective.impl());
>-    m_sourceMappingURLDirective.encode(encoder, codeBlock.m_sourceURLDirective.impl());
>-
>-    m_instructions.encode(encoder, codeBlock.m_instructions.get());
>-    m_propertyAccessInstructions.encode(encoder, codeBlock.m_propertyAccessInstructions);
>-    m_constantRegisters.encode(encoder, codeBlock.m_constantRegisters);
>-    m_constantsSourceCodeRepresentation.encode(encoder, codeBlock.m_constantsSourceCodeRepresentation);
>-    m_expressionInfo.encode(encoder, codeBlock.m_expressionInfo);
>-    m_jumpTargets.encode(encoder, codeBlock.m_jumpTargets);
>-    m_outOfLineJumpTargets.encode(encoder, codeBlock.m_outOfLineJumpTargets);
>-
>-    m_constantIdentifierSets.encode(encoder, codeBlock.m_constantIdentifierSets);
>-    m_identifiers.encode(encoder, codeBlock.m_identifiers);
>-    m_bitVectors.encode(encoder, codeBlock.m_bitVectors);
>-    m_functionDecls.encode(encoder, codeBlock.m_functionDecls);
>-    m_functionExprs.encode(encoder, codeBlock.m_functionExprs);
>-}
>-
>-class CachedSourceCodeKey : public CachedObject<SourceCodeKey> {
>-public:
>-    void encode(Encoder& encoder, const SourceCodeKey& key)
>-    {
>-        m_sourceCode.encode(encoder, key.m_sourceCode);
>-        m_name.encode(encoder, key.m_name);
>-        m_flags = key.m_flags.m_flags;
>-        m_hash = key.hash();
>-        m_functionConstructorParametersEndPosition = key.m_functionConstructorParametersEndPosition;
>-    }
>-
>-    void decode(Decoder& decoder, SourceCodeKey& key) const
>-    {
>-        m_sourceCode.decode(decoder, key.m_sourceCode);
>-        m_name.decode(decoder, key.m_name);
>-        key.m_flags.m_flags = m_flags;
>-        key.m_hash = m_hash;
>-        key.m_functionConstructorParametersEndPosition = m_functionConstructorParametersEndPosition;
>-    }
>-
>-private:
>-    CachedUnlinkedSourceCode m_sourceCode;
>-    CachedString m_name;
>-    unsigned m_flags;
>-    unsigned m_hash;
>-    int m_functionConstructorParametersEndPosition;
>-};
>-
>-class GenericCacheEntry {
>-public:
>-    std::pair<SourceCodeKey, UnlinkedCodeBlock*> decode(Decoder&) const;
>-
>-protected:
>-    CachedCodeBlockTag m_tag;
>-};
>-
>-template<typename UnlinkedCodeBlockType>
>-class CacheEntry : public GenericCacheEntry {
>-public:
>-    void encode(Encoder& encoder, std::pair<SourceCodeKey, const UnlinkedCodeBlockType*> pair)
>-    {
>-        m_tag = CachedCodeBlockTypeImpl<UnlinkedCodeBlockType>::tag;
>-        m_key.encode(encoder, pair.first);
>-        m_codeBlock.encode(encoder, pair.second);
>-    }
>-
>-private:
>-    friend GenericCacheEntry;
>-
>-    std::pair<SourceCodeKey, UnlinkedCodeBlockType*> decode(Decoder& decoder) const
>-    {
>-        ASSERT(m_tag == CachedCodeBlockTypeImpl<UnlinkedCodeBlockType>::tag);
>-        SourceCodeKey decodedKey;
>-        m_key.decode(decoder, decodedKey);
>-        return { WTFMove(decodedKey), m_codeBlock.decode(decoder) };
>-    }
>-
>-    CachedSourceCodeKey m_key;
>-    CachedPtr<CachedCodeBlockType<UnlinkedCodeBlockType>> m_codeBlock;
>-};
>-
>-std::pair<SourceCodeKey, UnlinkedCodeBlock*> GenericCacheEntry::decode(Decoder& decoder) const
>-{
>-    switch (m_tag) {
>-    case CachedProgramCodeBlockTag:
>-        return reinterpret_cast<const CacheEntry<UnlinkedProgramCodeBlock>*>(this)->decode(decoder);
>-    case CachedModuleCodeBlockTag:
>-        return reinterpret_cast<const CacheEntry<UnlinkedModuleProgramCodeBlock>*>(this)->decode(decoder);
>-    case CachedEvalCodeBlockTag:
>-        // We do not cache eval code blocks
>-        RELEASE_ASSERT_NOT_REACHED();
>-    }
>-#if COMPILER(MSVC)
>-    // Without this, MSVC will complain that this path does not return a value.
>-    return reinterpret_cast<const CacheEntry<UnlinkedEvalCodeBlock>*>(this)->decode(decoder);
>-#endif
>-}
>-
>-template<typename UnlinkedCodeBlockType>
>-void encodeCodeBlock(Encoder& encoder, const SourceCodeKey& key, const UnlinkedCodeBlock* codeBlock)
>-{
>-    auto* entry = encoder.template malloc<CacheEntry<UnlinkedCodeBlockType>>();
>-    entry->encode(encoder,  { key, jsCast<const UnlinkedCodeBlockType*>(codeBlock) });
>-}
>-
>-std::pair<MallocPtr<uint8_t>, size_t> encodeCodeBlock(VM& vm, const SourceCodeKey& key, const UnlinkedCodeBlock* codeBlock)
>-{
>-    const ClassInfo* classInfo = codeBlock->classInfo(vm);
>-
>-    Encoder encoder(vm);
>-    if (classInfo == UnlinkedProgramCodeBlock::info())
>-        encodeCodeBlock<UnlinkedProgramCodeBlock>(encoder, key, codeBlock);
>-    else if (classInfo == UnlinkedModuleProgramCodeBlock::info())
>-        encodeCodeBlock<UnlinkedModuleProgramCodeBlock>(encoder, key, codeBlock);
>-    else
>-        ASSERT(classInfo == UnlinkedEvalCodeBlock::info());
>-
>-    return encoder.release();
>-}
>-
>-UnlinkedCodeBlock* decodeCodeBlockImpl(VM& vm, const SourceCodeKey& key, const void* buffer, size_t size)
>-{
>-    const auto* cachedEntry = reinterpret_cast<const GenericCacheEntry*>(buffer);
>-    Decoder decoder(vm, buffer, size);
>-    std::pair<SourceCodeKey, UnlinkedCodeBlock*> entry;
>-    {
>-        DeferGC deferGC(vm.heap);
>-        entry = cachedEntry->decode(decoder);
>-    }
>-
>-    if (entry.first != key)
>-        return nullptr;
>-    return entry.second;
>-}
>-
>-} // namespace JSC
>Index: Source/JavaScriptCore/runtime/CachedTypes.h
>===================================================================
>--- Source/JavaScriptCore/runtime/CachedTypes.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/CachedTypes.h	(working copy)
>@@ -1,46 +0,0 @@
>-/*
>- * Copyright (C) 2018 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. ``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
>- * 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
>-
>-#include "JSCast.h"
>-#include <wtf/MallocPtr.h>
>-
>-namespace JSC {
>-
>-class SourceCodeKey;
>-class UnlinkedCodeBlock;
>-
>-std::pair<MallocPtr<uint8_t>, size_t> encodeCodeBlock(VM&, const SourceCodeKey&, const UnlinkedCodeBlock*);
>-UnlinkedCodeBlock* decodeCodeBlockImpl(VM&, const SourceCodeKey&, const void*, size_t);
>-
>-
>-template<typename UnlinkedCodeBlockType>
>-UnlinkedCodeBlockType* decodeCodeBlock(VM& vm, const SourceCodeKey& key, const void* buffer, size_t size)
>-{
>-    return jsCast<UnlinkedCodeBlockType*>(decodeCodeBlockImpl(vm, key, buffer, size));
>-}
>-
>-} // namespace JSC
>Index: Source/JavaScriptCore/runtime/CodeCache.cpp
>===================================================================
>--- Source/JavaScriptCore/runtime/CodeCache.cpp	(revision 240220)
>+++ Source/JavaScriptCore/runtime/CodeCache.cpp	(working copy)
>@@ -43,9 +43,6 @@ void CodeCacheMap::pruneSlowCase()
> 
>     while (m_size > m_capacity || !canPruneQuickly()) {
>         MapType::iterator it = m_map.begin();
>-
>-        writeCodeBlock(*it->value.cell->vm(), it->key, it->value);
>-
>         m_size -= it->key.length();
>         m_map.remove(it);
>     }
>@@ -62,8 +59,9 @@ UnlinkedCodeBlockType* CodeCache::getUnl
>         vm.typeProfiler() ? TypeProfilerEnabled::Yes : TypeProfilerEnabled::No, 
>         vm.controlFlowProfiler() ? ControlFlowProfilerEnabled::Yes : ControlFlowProfilerEnabled::No,
>         WTF::nullopt);
>-    UnlinkedCodeBlockType* unlinkedCodeBlock = m_sourceCode.findCacheAndUpdateAge<UnlinkedCodeBlockType>(vm, key);
>-    if (unlinkedCodeBlock && Options::useCodeCache()) {
>+    SourceCodeValue* cache = m_sourceCode.findCacheAndUpdateAge(key);
>+    if (cache && Options::useCodeCache()) {
>+        UnlinkedCodeBlockType* unlinkedCodeBlock = jsCast<UnlinkedCodeBlockType*>(cache->cell.get());
>         unsigned lineCount = unlinkedCodeBlock->lineCount();
>         unsigned startColumn = unlinkedCodeBlock->startColumn() + source.startColumn().oneBasedInt();
>         bool endColumnIsOnStartLine = !lineCount;
>@@ -73,9 +71,9 @@ UnlinkedCodeBlockType* CodeCache::getUnl
>         source.provider()->setSourceMappingURLDirective(unlinkedCodeBlock->sourceMappingURLDirective());
>         return unlinkedCodeBlock;
>     }
>-
>+    
>     VariableEnvironment variablesUnderTDZ;
>-    unlinkedCodeBlock = generateUnlinkedCodeBlock<UnlinkedCodeBlockType, ExecutableType>(vm, executable, source, strictMode, scriptMode, debuggerMode, error, evalContextType, &variablesUnderTDZ);
>+    UnlinkedCodeBlockType* unlinkedCodeBlock = generateUnlinkedCodeBlock<UnlinkedCodeBlockType, ExecutableType>(vm, executable, source, strictMode, scriptMode, debuggerMode, error, evalContextType, &variablesUnderTDZ);
> 
>     if (unlinkedCodeBlock && Options::useCodeCache())
>         m_sourceCode.addCache(key, SourceCodeValue(vm, unlinkedCodeBlock, m_sourceCode.age()));
>@@ -112,8 +110,9 @@ UnlinkedFunctionExecutable* CodeCache::g
>         vm.typeProfiler() ? TypeProfilerEnabled::Yes : TypeProfilerEnabled::No, 
>         vm.controlFlowProfiler() ? ControlFlowProfilerEnabled::Yes : ControlFlowProfilerEnabled::No,
>         functionConstructorParametersEndPosition);
>-    UnlinkedFunctionExecutable* executable = m_sourceCode.findCacheAndUpdateAge<UnlinkedFunctionExecutable>(vm, key);
>-    if (executable && Options::useCodeCache()) {
>+    SourceCodeValue* cache = m_sourceCode.findCacheAndUpdateAge(key);
>+    if (cache && Options::useCodeCache()) {
>+        UnlinkedFunctionExecutable* executable = jsCast<UnlinkedFunctionExecutable*>(cache->cell.get());
>         source.provider()->setSourceURLDirective(executable->sourceURLDirective());
>         source.provider()->setSourceMappingURLDirective(executable->sourceMappingURLDirective());
>         return executable;
>@@ -156,10 +155,4 @@ UnlinkedFunctionExecutable* CodeCache::g
>     return functionExecutable;
> }
> 
>-void CodeCache::write(VM& vm)
>-{
>-    for (const auto& it : m_sourceCode)
>-        writeCodeBlock(vm, it.key, it.value);
>-}
>-
> }
>Index: Source/JavaScriptCore/runtime/CodeCache.h
>===================================================================
>--- Source/JavaScriptCore/runtime/CodeCache.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/CodeCache.h	(working copy)
>@@ -26,7 +26,6 @@
> #pragma once
> 
> #include "BytecodeGenerator.h"
>-#include "CachedTypes.h"
> #include "ExecutableInfo.h"
> #include "JSCInlines.h"
> #include "Parser.h"
>@@ -38,7 +37,6 @@
> #include "UnlinkedEvalCodeBlock.h"
> #include "UnlinkedModuleProgramCodeBlock.h"
> #include "UnlinkedProgramCodeBlock.h"
>-#include <sys/stat.h>
> #include <wtf/Forward.h>
> #include <wtf/text/WTFString.h>
> 
>@@ -91,76 +89,13 @@ public:
>     {
>     }
> 
>-    iterator begin() { return m_map.begin(); }
>-    iterator end() { return m_map.end(); }
>-
>-    template<typename UnlinkedCodeBlockType>
>-    UnlinkedCodeBlockType* fetchFromDiskImpl(VM& vm, const SourceCodeKey& key)
>-    {
>-#if OS(DARWIN)
>-        const char* cachePath = Options::diskCachePath();
>-        if (!cachePath)
>-            return nullptr;
>-
>-        unsigned hash = key.hash();
>-        char filename[512];
>-        int count = snprintf(filename, 512, "%s/%u.cache", cachePath, hash);
>-        if (count < 0 || count > 512)
>-            return nullptr;
>-
>-        int fd = open(filename, O_RDONLY);
>-        if (fd == -1)
>-            return nullptr;
>-
>-        int rc = flock(fd, LOCK_SH | LOCK_NB);
>-        if (rc) {
>-            close(fd);
>-            return nullptr;
>-        }
>-
>-        struct stat sb;
>-        int res = fstat(fd, &sb);
>-        size_t size = static_cast<size_t>(sb.st_size);
>-        if (res || !size)
>-            return nullptr;
>-
>-        const void* buffer = mmap(nullptr, size, PROT_READ, MAP_PRIVATE, fd, 0);
>-        UnlinkedCodeBlockType* unlinkedCodeBlock = decodeCodeBlock<UnlinkedCodeBlockType>(vm, key, buffer, size);
>-
>-        if (!unlinkedCodeBlock)
>-            return nullptr;
>-
>-        addCache(key, SourceCodeValue(vm, unlinkedCodeBlock, m_age));
>-        return unlinkedCodeBlock;
>-#else
>-        UNUSED_PARAM(vm);
>-        UNUSED_PARAM(key);
>-        return nullptr;
>-#endif
>-    }
>-
>-    template<typename UnlinkedCodeBlockType>
>-    std::enable_if_t<std::is_base_of<UnlinkedCodeBlock, UnlinkedCodeBlockType>::value && !std::is_same<UnlinkedCodeBlockType, UnlinkedEvalCodeBlock>::value, UnlinkedCodeBlockType*>
>-    fetchFromDisk(VM& vm, const SourceCodeKey& key)
>-    {
>-        UnlinkedCodeBlockType* codeBlock = fetchFromDiskImpl<UnlinkedCodeBlockType>(vm, key);
>-        if (UNLIKELY(Options::forceDiskCache()))
>-            RELEASE_ASSERT(codeBlock);
>-        return codeBlock;
>-    }
>-
>-    template<typename T>
>-    std::enable_if_t<!std::is_base_of<UnlinkedCodeBlock, T>::value || std::is_same<T, UnlinkedEvalCodeBlock>::value, T*>
>-    fetchFromDisk(VM&, const SourceCodeKey&) { return nullptr; }
>-
>-    template<typename UnlinkedCodeBlockType>
>-    UnlinkedCodeBlockType* findCacheAndUpdateAge(VM& vm, const SourceCodeKey& key)
>+    SourceCodeValue* findCacheAndUpdateAge(const SourceCodeKey& key)
>     {
>         prune();
> 
>         iterator findResult = m_map.find(key);
>         if (findResult == m_map.end())
>-            return fetchFromDisk<UnlinkedCodeBlockType>(vm, key);
>+            return nullptr;
> 
>         int64_t age = m_age - findResult->value.age;
>         if (age > m_capacity) {
>@@ -180,7 +115,7 @@ public:
>         findResult->value.age = m_age;
>         m_age += key.length();
> 
>-        return jsCast<UnlinkedCodeBlockType*>(findResult->value.cell.get());
>+        return &findResult->value;
>     }
> 
>     AddResult addCache(const SourceCodeKey& key, const SourceCodeValue& value)
>@@ -262,7 +197,6 @@ public:
>     UnlinkedFunctionExecutable* getUnlinkedGlobalFunctionExecutable(VM&, const Identifier&, const SourceCode&, DebuggerMode, Optional<int> functionConstructorParametersEndPosition, ParserError&);
> 
>     void clear() { m_sourceCode.clear(); }
>-    JS_EXPORT_PRIVATE void write(VM&);
> 
> private:
>     template <class UnlinkedCodeBlockType, class ExecutableType> 
>@@ -322,36 +256,4 @@ UnlinkedCodeBlockType* generateUnlinkedC
>     return unlinkedCodeBlock;
> }
> 
>-ALWAYS_INLINE static void writeCodeBlock(VM& vm, const SourceCodeKey& key, const SourceCodeValue& value)
>-{
>-#if OS(DARWIN)
>-    const char* cachePath = Options::diskCachePath();
>-    if (LIKELY(!cachePath))
>-        return;
>-
>-    UnlinkedCodeBlock* codeBlock = jsDynamicCast<UnlinkedCodeBlock*>(vm, value.cell.get());
>-    if (!codeBlock)
>-        return;
>-
>-    unsigned hash = key.hash();
>-    char filename[512];
>-    int count = snprintf(filename, 512, "%s/%u.cache", cachePath, hash);
>-    if (count < 0 || count > 512)
>-        return;
>-
>-    std::pair<MallocPtr<uint8_t>, size_t> result = encodeCodeBlock(vm, key, codeBlock);
>-
>-    int fd = open(filename, O_CREAT | O_WRONLY, 0666);
>-    int rc = flock(fd, LOCK_EX | LOCK_NB);
>-    if (!rc)
>-        ::write(fd, result.first.get(), result.second);
>-    close(fd);
>-#else
>-    UNUSED_PARAM(vm);
>-    UNUSED_PARAM(key);
>-    UNUSED_PARAM(value);
>-#endif
>-}
>-
>-
> } // namespace JSC
>Index: Source/JavaScriptCore/runtime/JSBigInt.cpp
>===================================================================
>--- Source/JavaScriptCore/runtime/JSBigInt.cpp	(revision 240220)
>+++ Source/JavaScriptCore/runtime/JSBigInt.cpp	(working copy)
>@@ -1688,6 +1688,11 @@ bool JSBigInt::getPrimitiveNumber(ExecSt
>     return true;
> }
> 
>+inline size_t JSBigInt::offsetOfData()
>+{
>+    return WTF::roundUpToMultipleOf<sizeof(Digit)>(sizeof(JSBigInt));
>+}
>+
> template <typename CharType>
> JSBigInt* JSBigInt::parseInt(ExecState* exec, CharType*  data, unsigned length, ErrorParseMode errorParseMode)
> {
>@@ -1790,6 +1795,11 @@ JSBigInt* JSBigInt::parseInt(ExecState* 
>     return nullptr;
> }
> 
>+inline JSBigInt::Digit* JSBigInt::dataStorage()
>+{
>+    return reinterpret_cast<Digit*>(reinterpret_cast<char*>(this) + offsetOfData());
>+}
>+
> inline JSBigInt::Digit JSBigInt::digit(unsigned n)
> {
>     ASSERT(n < length());
>Index: Source/JavaScriptCore/runtime/JSBigInt.h
>===================================================================
>--- Source/JavaScriptCore/runtime/JSBigInt.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/JSBigInt.h	(working copy)
>@@ -38,7 +38,6 @@ namespace JSC {
> class JSBigInt final : public JSCell {
>     using Base = JSCell;
>     static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal | OverridesToThis;
>-    friend class CachedBigInt;
> 
> public:
> 
>@@ -229,15 +228,8 @@ private:
>     static Optional<Digit> toShiftAmount(JSBigInt* x);
> 
>     static size_t allocationSize(unsigned length);
>-    inline static size_t offsetOfData()
>-    {
>-        return WTF::roundUpToMultipleOf<sizeof(Digit)>(sizeof(JSBigInt));
>-    }
>-
>-    inline Digit* dataStorage()
>-    {
>-        return reinterpret_cast<Digit*>(reinterpret_cast<char*>(this) + offsetOfData());
>-    }
>+    static size_t offsetOfData();
>+    Digit* dataStorage();
> 
>     Digit digit(unsigned);
>     void setDigit(unsigned, Digit);
>Index: Source/JavaScriptCore/runtime/Options.cpp
>===================================================================
>--- Source/JavaScriptCore/runtime/Options.cpp	(revision 240220)
>+++ Source/JavaScriptCore/runtime/Options.cpp	(working copy)
>@@ -524,12 +524,6 @@ static void recomputeDependentOptions()
>     // https://bugs.webkit.org/show_bug.cgi?id=177956
>     Options::useProbeOSRExit() = false;
> #endif
>-
>-    if (!Options::useCodeCache())
>-        Options::diskCachePath() = nullptr;
>-
>-    if (!Options::diskCachePath())
>-        Options::forceDiskCache() = false;
> }
> 
> void Options::initialize()
>Index: Source/JavaScriptCore/runtime/Options.h
>===================================================================
>--- Source/JavaScriptCore/runtime/Options.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/Options.h	(working copy)
>@@ -508,8 +508,6 @@ constexpr bool enableWebAssemblyStreamin
>     v(bool, traceLLIntExecution, false, Configurable, nullptr) \
>     v(bool, traceLLIntSlowPath, false, Configurable, nullptr) \
>     v(bool, traceBaselineJITExecution, false, Normal, nullptr) \
>-    v(optionString, diskCachePath, nullptr, Restricted, "") \
>-    v(bool, forceDiskCache, false, Restricted, "") \
>     v(unsigned, thresholdForGlobalLexicalBindingEpoch, UINT_MAX, Normal, "Threshold for global lexical binding epoch. If the epoch reaches to this value, CodeBlock metadata for scope operations will be revised globally. It needs to be greater than 1.") \
> 
> 
>Index: Source/JavaScriptCore/runtime/RegExp.h
>===================================================================
>--- Source/JavaScriptCore/runtime/RegExp.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/RegExp.h	(working copy)
>@@ -41,8 +41,6 @@ class VM;
> JS_EXPORT_PRIVATE RegExpFlags regExpFlags(const String&);
> 
> class RegExp final : public JSCell {
>-    friend class CachedRegExp;
>-
> public:
>     typedef JSCell Base;
>     static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
>Index: Source/JavaScriptCore/runtime/ScopedArgumentsTable.h
>===================================================================
>--- Source/JavaScriptCore/runtime/ScopedArgumentsTable.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/ScopedArgumentsTable.h	(working copy)
>@@ -39,8 +39,6 @@ namespace JSC {
> // makes sense because such modifications are so uncommon. You'd have to do something crazy like
> // "delete arguments[i]" or some variant of defineOwnProperty.
> class ScopedArgumentsTable final : public JSCell {
>-    friend class CachedScopedArgumentsTable;
>-
> public:
>     typedef JSCell Base;
>     static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
>Index: Source/JavaScriptCore/runtime/StackFrame.h
>===================================================================
>--- Source/JavaScriptCore/runtime/StackFrame.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/StackFrame.h	(working copy)
>@@ -25,7 +25,6 @@
> 
> #pragma once
> 
>-#include "Heap.h"
> #include "WasmIndexOrName.h"
> #include "WriteBarrier.h"
> #include <limits.h>
>Index: Source/JavaScriptCore/runtime/StructureInlines.h
>===================================================================
>--- Source/JavaScriptCore/runtime/StructureInlines.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/StructureInlines.h	(working copy)
>@@ -31,7 +31,6 @@
> #include "PropertyMapHashTable.h"
> #include "Structure.h"
> #include "StructureChain.h"
>-#include "StructureRareDataInlines.h"
> 
> namespace JSC {
> 
>Index: Source/JavaScriptCore/runtime/SymbolTable.h
>===================================================================
>--- Source/JavaScriptCore/runtime/SymbolTable.h	(revision 240220)
>+++ Source/JavaScriptCore/runtime/SymbolTable.h	(working copy)
>@@ -73,8 +73,6 @@ static ALWAYS_INLINE int missingSymbolMa
> // copy:     SymbolTableEntry --> FatEntry -----^
> 
> struct SymbolTableEntry {
>-    friend class CachedSymbolTableEntry;
>-
> private:
>     static VarOffset varOffsetFromBits(intptr_t bits)
>     {
>@@ -438,8 +436,6 @@ struct SymbolTableIndexHashTraits : Hash
> };
> 
> class SymbolTable final : public JSCell {
>-    friend class CachedSymbolTable;
>-
> public:
>     typedef JSCell Base;
>     static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
>Index: Source/WTF/ChangeLog
>===================================================================
>--- Source/WTF/ChangeLog	(revision 240220)
>+++ Source/WTF/ChangeLog	(working copy)
>@@ -1,3 +1,12 @@
>+2019-01-20  Saam Barati  <sbarati@apple.com>
>+
>+        Rollout r240210: It broke tests on iOS
>+        https://bugs.webkit.org/show_bug.cgi?id=193640
>+
>+        Unreviewed.
>+
>+        * wtf/BitVector.h:
>+
> 2019-01-20  Tadeu Zagallo  <tzagallo@apple.com>
> 
>         Cache bytecode to disk
>Index: Source/WTF/wtf/BitVector.h
>===================================================================
>--- Source/WTF/wtf/BitVector.h	(revision 240220)
>+++ Source/WTF/wtf/BitVector.h	(working copy)
>@@ -33,10 +33,6 @@
> #include <wtf/PrintStream.h>
> #include <wtf/StdLibExtras.h>
> 
>-namespace JSC {
>-class CachedBitVector;
>-}
>-
> namespace WTF {
> 
> // This is a space-efficient, resizeable bitvector class. In the common case it
>@@ -342,8 +338,6 @@ public: 
>     iterator end() const { return iterator(*this, size()); }
>         
> private:
>-    friend class JSC::CachedBitVector;
>-
>     static unsigned bitsInPointer()
>     {
>         return sizeof(void*) << 3;
>Index: Tools/ChangeLog
>===================================================================
>--- Tools/ChangeLog	(revision 240220)
>+++ Tools/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2019-01-20  Saam Barati  <sbarati@apple.com>
>+
>+        Rollout r240210: It broke tests on iOS
>+        https://bugs.webkit.org/show_bug.cgi?id=193640
>+
>+        Unreviewed.
>+
>+        * Scripts/jsc-stress-test-helpers/bytecode-cache-test-helper:
>+        * Scripts/run-jsc-stress-tests:
>+
> 2019-01-20  chris fleizach  <cfleizach@apple.com>
> 
>         AX: Support returning relative frames for accessibility
>Index: Tools/Scripts/run-jsc-stress-tests
>===================================================================
>--- Tools/Scripts/run-jsc-stress-tests	(revision 240220)
>+++ Tools/Scripts/run-jsc-stress-tests	(working copy)
>@@ -655,15 +655,6 @@ def runDefault(*optionalTestSpecificOpti
>     run("default", *(FTL_OPTIONS + optionalTestSpecificOptions))
> end
> 
>-def runBytecodeCache(*optionalTestSpecificOptions)
>-    unless $hostOS == "darwin"
>-        skip
>-        return
>-    end
>-    options = BASE_OPTIONS + $testSpecificRequiredOptions + FTL_OPTIONS + optionalTestSpecificOptions
>-    addRunCommand("bytecode-cache", ["ruby", (pathToHelpers + "bytecode-cache-test-helper").to_s, pathToVM.to_s, $benchmark.to_s] + options, silentOutputHandler, simpleErrorHandler)
>-end
>-
> def runBigIntEnabled(*optionalTestSpecificOptions)
>     # FIXME: <rdar://problem/40331121>
>     if $remote or ($architecture !~ /x86/i and $hostOS == "darwin")
>@@ -760,7 +751,6 @@ def defaultRun
>         defaultQuickRun
>     else
>         runDefault
>-        runBytecodeCache
>         if $jitTests
>             runNoLLInt
>             runNoCJITValidatePhases
>Index: Tools/Scripts/jsc-stress-test-helpers/bytecode-cache-test-helper
>===================================================================
>--- Tools/Scripts/jsc-stress-test-helpers/bytecode-cache-test-helper	(revision 240220)
>+++ Tools/Scripts/jsc-stress-test-helpers/bytecode-cache-test-helper	(working copy)
>@@ -1,48 +0,0 @@
>-#!/usr/bin/env ruby
>-
>-# Copyright (C) 2018 Apple Inc. All rights reserved.
>-#
>-# Redistribution and use in source and binary forms, with or without
>-# modification, are permitted provided that the following conditions
>-# are met:
>-#
>-# 1.  Redistributions of source code must retain the above copyright
>-#     notice, this list of conditions and the following disclaimer.
>-# 2.  Redistributions in binary form must reproduce the above copyright
>-#     notice, this list of conditions and the following disclaimer in the
>-#     documentation and/or other materials provided with the distribution.
>-#
>-# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
>-# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
>-# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
>-# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
>-# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
>-# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
>-# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
>-# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
>-# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>-
>-require 'rubygems'
>-require 'fileutils'
>-require 'json'
>-require 'shellwords'
>-require 'tmpdir'
>-
>-def mysys(*cmd)
>-    raise "Command #{cmd.inspect} failed: #{$?.inspect}" unless system(*cmd)
>-end
>-
>-pathToVM = ARGV[0]
>-inputFile = ARGV[1]
>-extraOptions = ARGV[2..-1]
>-diskCachePath = Dir.mktmpdir [inputFile, 'bytecode-cache']
>-
>-begin
>-    ENV["JSC_diskCachePath"] = diskCachePath
>-    mysys(pathToVM, inputFile, *extraOptions)
>-    ENV["JSC_forceDiskCache"] = "true"
>-    mysys(pathToVM, inputFile, *extraOptions)
>-ensure
>-    FileUtils.rm_rf(diskCachePath)
>-end

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Attachments on bug 193640: 359665 | 359666