Attachment 359410 Details for Bug 193523 – Patch

[patch] Patch

bug-193523-20190117134529.patch (text/plain), 27.70 KB, created by Keith Miller on 2019-01-17 13:45:30 PST

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Creator: Keith Miller

Created: 2019-01-17 13:45:30 PST

Size: 27.70 KB

patch

obsolete

>Subversion Revision: 240100
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 347fa49aa02a81b56932835e99c3d950d849432b..7dec5bf68190e8e0b9145c6ef75d04d9f5cd7667 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,15 @@
>+2019-01-17  Keith Miller  <keith_miller@apple.com>
>+
>+        Gigacages should start allocations from a slide
>+        https://bugs.webkit.org/show_bug.cgi?id=193523
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This patch changes some macros into constants since macros are the
>+        devil.
>+
>+        * llint/LowLevelInterpreter64.asm:
>+
> 2019-01-16  Mark Lam  <mark.lam@apple.com>
> 
>         Refactor new bytecode structs so that the fields are prefixed with "m_".
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index 121e6bfeea9fb9d01bb1fd785ebb2cbcdec10c72..9f23bedca1fb5bdece14cb51a9a281d57ecf37aa 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,16 @@
>+2019-01-17  Keith Miller  <keith_miller@apple.com>
>+
>+        Gigacages should start allocations from a slide
>+        https://bugs.webkit.org/show_bug.cgi?id=193523
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This patch changes some macros into constants since macros are the
>+        devil.
>+
>+        * wtf/Gigacage.cpp:
>+        * wtf/Gigacage.h:
>+
> 2019-01-16  Keith Miller  <keith_miller@apple.com>
> 
>         bmalloc should use JSC VM tag for gigacage
>diff --git a/Source/bmalloc/ChangeLog b/Source/bmalloc/ChangeLog
>index b30d125432c9ff0e36cc383dd78aadb167420dbe..edbd7b76b0b91117aa476fb478856b6e5ba6be22 100644
>--- a/Source/bmalloc/ChangeLog
>+++ b/Source/bmalloc/ChangeLog
>@@ -1,3 +1,49 @@
>+2019-01-17  Keith Miller  <keith_miller@apple.com>
>+
>+        Gigacages should start allocations from a slide
>+        https://bugs.webkit.org/show_bug.cgi?id=193523
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This patch makes is so that Gigacage Heaps slide the start of the
>+        cage by some random amount. We still ensure that there is always
>+        at least 4/2GB, on MacOS/iOS respectively, of VA space available
>+        for allocation.
>+
>+        Also, this patch changes some macros into constants since macros
>+        are the devil.
>+
>+        * bmalloc/Gigacage.cpp:
>+        (Gigacage::bmalloc::protectGigacageBasePtrs):
>+        (Gigacage::bmalloc::unprotectGigacageBasePtrs):
>+        (Gigacage::bmalloc::runwaySize):
>+        (Gigacage::ensureGigacage):
>+        (Gigacage::shouldBeEnabled):
>+        * bmalloc/Gigacage.h:
>+        (Gigacage::name):
>+        (Gigacage::gigacageSizeToMask):
>+        (Gigacage::size):
>+        (Gigacage::mask):
>+        (Gigacage::basePtr):
>+        (Gigacage::ensureGigacage):
>+        (Gigacage::wasEnabled):
>+        (Gigacage::isCaged):
>+        (Gigacage::caged):
>+        (Gigacage::disableDisablingPrimitiveGigacageIfShouldBeEnabled):
>+        (Gigacage::disablePrimitiveGigacage):
>+        (Gigacage::addPrimitiveDisableCallback):
>+        (Gigacage::removePrimitiveDisableCallback):
>+        * bmalloc/Heap.cpp:
>+        (bmalloc::Heap::Heap):
>+        * bmalloc/Sizes.h:
>+        (bmalloc::Sizes::maskSizeClass):
>+        (bmalloc::Sizes::maskObjectSize):
>+        (bmalloc::Sizes::logSizeClass):
>+        (bmalloc::Sizes::logObjectSize):
>+        (bmalloc::Sizes::sizeClass):
>+        (bmalloc::Sizes::objectSize):
>+        (bmalloc::Sizes::pageSize):
>+
> 2019-01-16  Keith Miller  <keith_miller@apple.com>
> 
>         bmalloc should use JSC VM tag for gigacage
>diff --git a/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm b/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
>index 810592c5feed673b92f5390bf9f8a8808be0487a..d1491f96666afc577a93730431fcaa1ae87acdd8 100644
>--- a/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
>+++ b/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
>@@ -1315,7 +1315,7 @@ llintOpWithMetadata(op_get_by_id, OpGetById, macro (size, get, dispatch, metadat
>     arrayProfile(OpGetById::Metadata::m_modeMetadata.arrayLengthMode.arrayProfile, t0, t2, t5)
>     btiz t0, IsArray, .opGetByIdSlow
>     btiz t0, IndexingShapeMask, .opGetByIdSlow
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr JSVALUE_GIGACAGE_MASK, JSObject::m_butterfly[t3], t0, t1)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr Gigacage::jsValueGigacageMask, JSObject::m_butterfly[t3], t0, t1)
>     loadi -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t0], t0
>     bilt t0, 0, .opGetByIdSlow
>     orq tagTypeNumber, t0
>@@ -1438,7 +1438,7 @@ llintOpWithMetadata(op_get_by_val, OpGetByVal, macro (size, get, dispatch, metad
>     loadConstantOrVariableInt32(size, t3, t1, .opGetByValSlow)
>     sxi2q t1, t1
> 
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr JSVALUE_GIGACAGE_MASK, JSObject::m_butterfly[t0], t3, tagTypeNumber)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr Gigacage::jsValueGigacageMask, JSObject::m_butterfly[t0], t3, tagTypeNumber)
>     move TagTypeNumber, tagTypeNumber
> 
>     andi IndexingShapeMask, t2
>@@ -1504,7 +1504,7 @@ llintOpWithMetadata(op_get_by_val, OpGetByVal, macro (size, get, dispatch, metad
>     bia t2, Int8ArrayType - FirstTypedArrayType, .opGetByValUint8ArrayOrUint8ClampedArray
> 
>     # We have Int8ArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     loadbs [t3, t1], t0
>     finishIntGetByVal(t0, t1)
> 
>@@ -1512,13 +1512,13 @@ llintOpWithMetadata(op_get_by_val, OpGetByVal, macro (size, get, dispatch, metad
>     bia t2, Uint8ArrayType - FirstTypedArrayType, .opGetByValUint8ClampedArray
> 
>     # We have Uint8ArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     loadb [t3, t1], t0
>     finishIntGetByVal(t0, t1)
> 
> .opGetByValUint8ClampedArray:
>     # We have Uint8ClampedArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     loadb [t3, t1], t0
>     finishIntGetByVal(t0, t1)
> 
>@@ -1527,13 +1527,13 @@ llintOpWithMetadata(op_get_by_val, OpGetByVal, macro (size, get, dispatch, metad
>     bia t2, Int16ArrayType - FirstTypedArrayType, .opGetByValUint16Array
> 
>     # We have Int16ArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     loadhs [t3, t1, 2], t0
>     finishIntGetByVal(t0, t1)
> 
> .opGetByValUint16Array:
>     # We have Uint16ArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     loadh [t3, t1, 2], t0
>     finishIntGetByVal(t0, t1)
> 
>@@ -1545,13 +1545,13 @@ llintOpWithMetadata(op_get_by_val, OpGetByVal, macro (size, get, dispatch, metad
>     bia t2, Int32ArrayType - FirstTypedArrayType, .opGetByValUint32Array
> 
>     # We have Int32ArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     loadi [t3, t1, 4], t0
>     finishIntGetByVal(t0, t1)
> 
> .opGetByValUint32Array:
>     # We have Uint32ArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     # This is the hardest part because of large unsigned values.
>     loadi [t3, t1, 4], t0
>     bilt t0, 0, .opGetByValSlow # This case is still awkward to implement in LLInt.
>@@ -1563,7 +1563,7 @@ llintOpWithMetadata(op_get_by_val, OpGetByVal, macro (size, get, dispatch, metad
>     bieq t2, Float32ArrayType - FirstTypedArrayType, .opGetByValSlow
> 
>     # We have Float64ArrayType.
>-    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_vector[t0], t3, t2)
>+    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr Gigacage::primitiveGigacageMask, JSArrayBufferView::m_vector[t0], t3, t2)
>     loadd [t3, t1, 8], ft0
>     bdnequn ft0, ft0, .opGetByValSlow
>     finishDoubleGetByVal(ft0, t0, t1)
>@@ -1599,7 +1599,7 @@ macro putByValOp(name, op)
>         get(m_property, t0)
>         loadConstantOrVariableInt32(size, t0, t3, .opPutByValSlow)
>         sxi2q t3, t3
>-        loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr JSVALUE_GIGACAGE_MASK, JSObject::m_butterfly[t1], t0, tagTypeNumber)
>+        loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr Gigacage::jsValueGigacageMask, JSObject::m_butterfly[t1], t0, tagTypeNumber)
>         move TagTypeNumber, tagTypeNumber
>         btinz t2, CopyOnWrite, .opPutByValSlow
>         andi IndexingShapeMask, t2
>diff --git a/Source/WTF/wtf/Gigacage.cpp b/Source/WTF/wtf/Gigacage.cpp
>index ad93fa42859d6a1379c46871a75b4646af183d71..f7c2a5df7cdbcce41d402b70ba86d4d7bbe98904 100644
>--- a/Source/WTF/wtf/Gigacage.cpp
>+++ b/Source/WTF/wtf/Gigacage.cpp
>@@ -32,10 +32,10 @@
> 
> #if defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
> 
>-alignas(void*) char g_gigacageBasePtrs[GIGACAGE_BASE_PTRS_SIZE];
>-
> namespace Gigacage {
> 
>+alignas(void*) char g_gigacageBasePtrs[gigacageBasePtrsSize];
>+
> void* tryMalloc(Kind, size_t size)
> {
>     return FastMalloc::tryMalloc(size);
>@@ -61,7 +61,7 @@ void freeVirtualPages(Kind, void* basePtr, size_t size)
> }
> 
> } // namespace Gigacage
>-#else
>+#else // defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
> #include <bmalloc/bmalloc.h>
> 
> namespace Gigacage {
>diff --git a/Source/WTF/wtf/Gigacage.h b/Source/WTF/wtf/Gigacage.h
>index 1b048313a362821b1f887fa5b7e3d3e002938b69..50227a281c52a49af21e076bcbfc991ad83a95f5 100644
>--- a/Source/WTF/wtf/Gigacage.h
>+++ b/Source/WTF/wtf/Gigacage.h
>@@ -29,16 +29,15 @@
> 
> #if defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
> #define GIGACAGE_ENABLED 0
>-#define PRIMITIVE_GIGACAGE_MASK 0
>-#define JSVALUE_GIGACAGE_MASK 0
>-#define GIGACAGE_BASE_PTRS_SIZE 8192
>-
>-extern "C" {
>-alignas(void*) extern WTF_EXPORT_PRIVATE char g_gigacageBasePtrs[GIGACAGE_BASE_PTRS_SIZE];
>-}
> 
> namespace Gigacage {
> 
>+const size_t primitiveGigacageMask = 0;
>+const size_t jsValueGigacageMask = 0;
>+const size_t gigacageBasePtrsSize = 8 * kB;
>+
>+extern "C" alignas(void*) extern WTF_EXPORT_PRIVATE char g_gigacageBasePtrs[gigacageBasePtrsSize];
>+
> struct BasePtrs {
>     uintptr_t reservedForFlags;
>     void* primitive;
>diff --git a/Source/bmalloc/bmalloc/Gigacage.cpp b/Source/bmalloc/bmalloc/Gigacage.cpp
>index a88623d69ee370ee9ddee3457159128f03f0cb3a..b6ae18679a5096158b03a7b7b2f0f36ae7dd86df 100644
>--- a/Source/bmalloc/bmalloc/Gigacage.cpp
>+++ b/Source/bmalloc/bmalloc/Gigacage.cpp
>@@ -35,23 +35,25 @@
> #include <cstdio>
> #include <mutex>
> 
>+#if GIGACAGE_ENABLED
>+
>+namespace Gigacage {
>+
> // This is exactly 32GB because inside JSC, indexed accesses for arrays, typed arrays, etc,
> // use unsigned 32-bit ints as indices. The items those indices access are 8 bytes or less
> // in size. 2^32 * 8 = 32GB. This means if an access on a caged type happens to go out of
> // bounds, the access is guaranteed to land somewhere else in the cage or inside the runway.
> // If this were less than 32GB, those OOB accesses could reach outside of the cage.
>-#define GIGACAGE_RUNWAY (32llu * 1024 * 1024 * 1024)
>+constexpr uint64_t gigacageRunway = 32llu * 1024 * 1024 * 1024;
> 
> // Note: g_gigacageBasePtrs[0] is reserved for storing the wasEnabled flag.
> // The first gigacageBasePtr will start at g_gigacageBasePtrs[sizeof(void*)].
> // This is done so that the wasEnabled flag will also be protected along with the
> // gigacageBasePtrs.
>-alignas(GIGACAGE_BASE_PTRS_SIZE) char g_gigacageBasePtrs[GIGACAGE_BASE_PTRS_SIZE];
>+alignas(gigacageBasePtrsSize) char g_gigacageBasePtrs[gigacageBasePtrsSize];
> 
> using namespace bmalloc;
> 
>-namespace Gigacage {
>-
> namespace {
> 
> bool s_isDisablingPrimitiveGigacageDisabled;
>@@ -61,12 +63,12 @@ void protectGigacageBasePtrs()
>     uintptr_t basePtrs = reinterpret_cast<uintptr_t>(g_gigacageBasePtrs);
>     // We might only get page size alignment, but that's also the minimum we need.
>     RELEASE_BASSERT(!(basePtrs & (vmPageSize() - 1)));
>-    mprotect(g_gigacageBasePtrs, GIGACAGE_BASE_PTRS_SIZE, PROT_READ);
>+    mprotect(g_gigacageBasePtrs, gigacageBasePtrsSize, PROT_READ);
> }
> 
> void unprotectGigacageBasePtrs()
> {
>-    mprotect(g_gigacageBasePtrs, GIGACAGE_BASE_PTRS_SIZE, PROT_READ | PROT_WRITE);
>+    mprotect(g_gigacageBasePtrs, gigacageBasePtrsSize, PROT_READ | PROT_WRITE);
> }
> 
> class UnprotectGigacageBasePtrsScope {
>@@ -101,26 +103,23 @@ struct PrimitiveDisableCallbacks {
>     Vector<Callback> callbacks;
> };
> 
>-#if GIGACAGE_ENABLED
> size_t runwaySize(Kind kind)
> {
>     switch (kind) {
>     case Kind::ReservedForFlagsAndNotABasePtr:
>         RELEASE_BASSERT_NOT_REACHED();
>     case Kind::Primitive:
>-        return static_cast<size_t>(GIGACAGE_RUNWAY);
>+        return static_cast<size_t>(gigacageRunway);
>     case Kind::JSValue:
>         return static_cast<size_t>(0);
>     }
>     return static_cast<size_t>(0);
> }
>-#endif
> 
> } // anonymous namespace
> 
> void ensureGigacage()
> {
>-#if GIGACAGE_ENABLED
>     static std::once_flag onceFlag;
>     std::call_once(
>         onceFlag,
>@@ -189,7 +188,6 @@ void ensureGigacage()
>             setWasEnabled();
>             protectGigacageBasePtrs();
>         });
>-#endif // GIGACAGE_ENABLED
> }
> 
> void disablePrimitiveGigacage()
>@@ -265,8 +263,6 @@ bool isDisablingPrimitiveGigacageDisabled()
> bool shouldBeEnabled()
> {
>     static bool cached = false;
>-
>-#if GIGACAGE_ENABLED
>     static std::once_flag onceFlag;
>     std::call_once(
>         onceFlag,
>@@ -288,12 +284,11 @@ bool shouldBeEnabled()
>             
>             cached = true;
>         });
>-#endif // GIGACAGE_ENABLED
>-    
>     return cached;
> }
> 
> } // namespace Gigacage
> 
>+#endif // GIGACAGE_ENABLED
> 
> 
>diff --git a/Source/bmalloc/bmalloc/Gigacage.h b/Source/bmalloc/bmalloc/Gigacage.h
>index eab80fd2d3e24228cb9ffcdd83479d1ebdcb1d38..b287c0c3c55c6ec2d6b7e34210d4a7c1e8c39521 100644
>--- a/Source/bmalloc/bmalloc/Gigacage.h
>+++ b/Source/bmalloc/bmalloc/Gigacage.h
>@@ -30,16 +30,53 @@
> #include "BExport.h"
> #include "BInline.h"
> #include "BPlatform.h"
>+#include "Sizes.h"
> #include <cstddef>
> #include <inttypes.h>
> 
>+#if ((BOS(DARWIN) || BOS(LINUX)) && \
>+(BCPU(X86_64) || (BCPU(ARM64) && !defined(__ILP32__) && (!BPLATFORM(IOS_FAMILY) || BPLATFORM(IOS)))))
>+#define GIGACAGE_ENABLED 1
>+#else
>+#define GIGACAGE_ENABLED 0
>+#endif
>+
>+
>+namespace Gigacage {
>+
>+enum Kind {
>+    ReservedForFlagsAndNotABasePtr = 0,
>+    Primitive,
>+    JSValue,
>+};
>+
>+BINLINE const char* name(Kind kind)
>+{
>+    switch (kind) {
>+    case ReservedForFlagsAndNotABasePtr:
>+        RELEASE_BASSERT_NOT_REACHED();
>+    case Primitive:
>+        return "Primitive";
>+    case JSValue:
>+        return "JSValue";
>+    }
>+    BCRASH();
>+    return nullptr;
>+}
>+
>+#if GIGACAGE_ENABLED
>+
> #if BCPU(ARM64)
>-#define PRIMITIVE_GIGACAGE_SIZE 0x80000000llu
>-#define JSVALUE_GIGACAGE_SIZE 0x40000000llu
>+constexpr size_t primitiveGigacageSize = 2 * bmalloc::Sizes::GB;
>+constexpr size_t jsValueGigacageSize = 1 * bmalloc::Sizes::GB;
>+constexpr size_t gigacageBasePtrsSize = 16 * bmalloc::Sizes::kB;
>+constexpr size_t minimumCageSizeAfterSlide = bmalloc::Sizes::GB / 2;
> #define GIGACAGE_ALLOCATION_CAN_FAIL 1
> #else
>-#define PRIMITIVE_GIGACAGE_SIZE 0x800000000llu
>-#define JSVALUE_GIGACAGE_SIZE 0x400000000llu
>+constexpr size_t primitiveGigacageSize = 32 * bmalloc::Sizes::GB;
>+constexpr size_t jsValueGigacageSize = 16 * bmalloc::Sizes::GB;
>+constexpr size_t gigacageBasePtrsSize = 4 * bmalloc::Sizes::kB;
>+constexpr size_t minimumCageSizeAfterSlide = 4 * bmalloc::Sizes::GB;
> #define GIGACAGE_ALLOCATION_CAN_FAIL 0
> #endif
> 
>@@ -50,30 +87,15 @@
> #define GIGACAGE_ALLOCATION_CAN_FAIL 1
> #endif
> 
>-static_assert(bmalloc::isPowerOfTwo(PRIMITIVE_GIGACAGE_SIZE), "");
>-static_assert(bmalloc::isPowerOfTwo(JSVALUE_GIGACAGE_SIZE), "");
>-
>-#define GIGACAGE_SIZE_TO_MASK(size) ((size) - 1)
>-
>-#define PRIMITIVE_GIGACAGE_MASK GIGACAGE_SIZE_TO_MASK(PRIMITIVE_GIGACAGE_SIZE)
>-#define JSVALUE_GIGACAGE_MASK GIGACAGE_SIZE_TO_MASK(JSVALUE_GIGACAGE_SIZE)
>-
>-#if ((BOS(DARWIN) || BOS(LINUX)) && \
>-    (BCPU(X86_64) || (BCPU(ARM64) && !defined(__ILP32__) && (!BPLATFORM(IOS_FAMILY) || BPLATFORM(IOS)))))
>-#define GIGACAGE_ENABLED 1
>-#else
>-#define GIGACAGE_ENABLED 0
>-#endif
>+static_assert(bmalloc::isPowerOfTwo(primitiveGigacageSize), "");
>+static_assert(bmalloc::isPowerOfTwo(jsValueGigacageSize), "");
> 
>-#if BCPU(ARM64)
>-#define GIGACAGE_BASE_PTRS_SIZE 16384
>-#else
>-#define GIGACAGE_BASE_PTRS_SIZE 4096
>-#endif
>+constexpr size_t gigacageSizeToMask(size_t size) { return size - 1; }
> 
>-extern "C" alignas(GIGACAGE_BASE_PTRS_SIZE) BEXPORT char g_gigacageBasePtrs[GIGACAGE_BASE_PTRS_SIZE];
>+constexpr size_t primitiveGigacageMask = gigacageSizeToMask(primitiveGigacageSize);
>+constexpr size_t jsValueGigacageMask = gigacageSizeToMask(jsValueGigacageSize);
> 
>-namespace Gigacage {
>+extern "C" alignas(gigacageBasePtrsSize) BEXPORT char g_gigacageBasePtrs[gigacageBasePtrsSize];
> 
> BINLINE bool wasEnabled() { return g_gigacageBasePtrs[0]; }
> BINLINE void setWasEnabled() { g_gigacageBasePtrs[0] = true; }
>@@ -84,16 +106,10 @@ struct BasePtrs {
>     void* jsValue;
> };
> 
>-enum Kind {
>-    ReservedForFlagsAndNotABasePtr = 0,
>-    Primitive,
>-    JSValue,
>-};
>-
> static_assert(offsetof(BasePtrs, primitive) == Kind::Primitive * sizeof(void*), "");
> static_assert(offsetof(BasePtrs, jsValue) == Kind::JSValue * sizeof(void*), "");
> 
>-static constexpr unsigned numKinds = 2;
>+constexpr unsigned numKinds = 2;
> 
> BEXPORT void ensureGigacage();
> 
>@@ -109,20 +125,6 @@ BEXPORT bool isDisablingPrimitiveGigacageDisabled();
> inline bool isPrimitiveGigacagePermanentlyEnabled() { return isDisablingPrimitiveGigacageDisabled(); }
> inline bool canPrimitiveGigacageBeDisabled() { return !isDisablingPrimitiveGigacageDisabled(); }
> 
>-BINLINE const char* name(Kind kind)
>-{
>-    switch (kind) {
>-    case ReservedForFlagsAndNotABasePtr:
>-        RELEASE_BASSERT_NOT_REACHED();
>-    case Primitive:
>-        return "Primitive";
>-    case JSValue:
>-        return "JSValue";
>-    }
>-    BCRASH();
>-    return nullptr;
>-}
>-
> BINLINE void*& basePtr(BasePtrs& basePtrs, Kind kind)
> {
>     switch (kind) {
>@@ -158,9 +160,9 @@ BINLINE size_t size(Kind kind)
>     case ReservedForFlagsAndNotABasePtr:
>         RELEASE_BASSERT_NOT_REACHED();
>     case Primitive:
>-        return static_cast<size_t>(PRIMITIVE_GIGACAGE_SIZE);
>+        return static_cast<size_t>(primitiveGigacageSize);
>     case JSValue:
>-        return static_cast<size_t>(JSVALUE_GIGACAGE_SIZE);
>+        return static_cast<size_t>(jsValueGigacageSize);
>     }
>     BCRASH();
>     return 0;
>@@ -173,7 +175,7 @@ BINLINE size_t alignment(Kind kind)
> 
> BINLINE size_t mask(Kind kind)
> {
>-    return GIGACAGE_SIZE_TO_MASK(size(kind));
>+    return gigacageSizeToMask(size(kind));
> }
> 
> template<typename Func>
>@@ -202,6 +204,27 @@ BINLINE bool isCaged(Kind kind, const void* ptr)
> 
> BEXPORT bool shouldBeEnabled();
> 
>+#else // GIGACAGE_ENABLED
>+
>+BINLINE void*& basePtr(Kind)
>+{
>+    BCRASH();
>+    static void* unreachable;
>+    return unreachable;
>+}
>+BINLINE size_t size(Kind) { BCRASH(); return 0; }
>+BINLINE void ensureGigacage() { }
>+BINLINE bool wasEnabled() { return false; }
>+BINLINE bool isCaged(Kind, const void*) { return false; }
>+template<typename T> BINLINE T* caged(Kind, T* ptr) { BCRASH(); return ptr; }
>+BINLINE void disableDisablingPrimitiveGigacageIfShouldBeEnabled() { }
>+BINLINE void disablePrimitiveGigacage() { }
>+BINLINE void addPrimitiveDisableCallback(void (*)(void*), void*) { }
>+BINLINE void removePrimitiveDisableCallback(void (*)(void*), void*) { }
>+
>+#endif // GIGACAGE_ENABLED
>+
> } // namespace Gigacage
> 
> 
>+
>diff --git a/Source/bmalloc/bmalloc/Heap.cpp b/Source/bmalloc/bmalloc/Heap.cpp
>index 53b3e369193f1f5499a3acea47bc571792b30a0e..288db41ec5e4da547e6c89ccd0b56e7488e7f089 100644
>--- a/Source/bmalloc/bmalloc/Heap.cpp
>+++ b/Source/bmalloc/bmalloc/Heap.cpp
>@@ -29,6 +29,7 @@
> #include "BulkDecommit.h"
> #include "BumpAllocator.h"
> #include "Chunk.h"
>+#include "CryptoRandom.h"
> #include "Environment.h"
> #include "Gigacage.h"
> #include "DebugHeap.h"
>@@ -61,7 +62,13 @@ Heap::Heap(HeapKind kind, std::lock_guard<Mutex>&)
> #if GIGACAGE_ENABLED
>         if (usingGigacage()) {
>             RELEASE_BASSERT(gigacageBasePtr());
>-            m_largeFree.add(LargeRange(gigacageBasePtr(), gigacageSize(), 0, 0));
>+            uint64_t random;
>+            cryptoRandom(reinterpret_cast<unsigned char*>(&random), sizeof(random));
>+            RELEASE_BASSERT(gigacageSize() > Gigacage::minimumCageSizeAfterSlide);
>+            ptrdiff_t offset = random % (gigacageSize() - Gigacage::minimumCageSizeAfterSlide);
>+            offset = reinterpret_cast<ptrdiff_t>(roundDownToMultipleOf(vmPageSize(), reinterpret_cast<void*>(offset)));
>+            void* base = reinterpret_cast<unsigned char*>(gigacageBasePtr()) + offset;
>+            m_largeFree.add(LargeRange(base, gigacageSize() - offset, 0, 0));
>         }
> #endif
>     }
>diff --git a/Source/bmalloc/bmalloc/Sizes.h b/Source/bmalloc/bmalloc/Sizes.h
>index f75f7e8fcc7f67dbd503c789c8fc8540b50c14c9..335f00f4ef6165b5b17a452c6e7147a1a3a28d51 100644
>--- a/Source/bmalloc/bmalloc/Sizes.h
>+++ b/Source/bmalloc/bmalloc/Sizes.h
>@@ -40,88 +40,89 @@ namespace bmalloc {
> // Repository for malloc sizing constants and calculations.
> 
> namespace Sizes {
>-    static const size_t kB = 1024;
>-    static const size_t MB = kB * kB;
>-
>-    static const size_t alignment = 8;
>-    static const size_t alignmentMask = alignment - 1ul;
>-
>-    static const size_t chunkSize = 1 * MB;
>-    static const size_t chunkMask = ~(chunkSize - 1ul);
>-
>-    static const size_t smallLineSize = 256;
>-    static const size_t smallPageSize = 4 * kB;
>-    static const size_t smallPageLineCount = smallPageSize / smallLineSize;
>-
>-    static const size_t maskSizeClassMax = 512;
>-    static const size_t smallMax = 32 * kB;
>-
>-    static const size_t pageSizeMax = smallMax * 2;
>-    static const size_t pageClassCount = pageSizeMax / smallPageSize;
>-
>-    static const size_t pageSizeWasteFactor = 8;
>-    static const size_t logWasteFactor = 8;
>-
>-    static const size_t largeAlignment = smallMax / pageSizeWasteFactor;
>-    static const size_t largeAlignmentMask = largeAlignment - 1;
>-
>-    static const size_t deallocatorLogCapacity = 512;
>-    static const size_t bumpRangeCacheCapacity = 3;
>-    
>-    static const size_t scavengerBytesPerMemoryPressureCheck = 16 * MB;
>-    static const double memoryPressureThreshold = 0.75;
>-    
>-    static const size_t maskSizeClassCount = maskSizeClassMax / alignment;
>-
>-    constexpr size_t maskSizeClass(size_t size)
>-    {
>-        // We mask to accommodate zero.
>-        return mask((size - 1) / alignment, maskSizeClassCount - 1);
>-    }
>-
>-    inline size_t maskObjectSize(size_t maskSizeClass)
>-    {
>-        return (maskSizeClass + 1) * alignment;
>-    }
>-
>-    static const size_t logAlignmentMin = maskSizeClassMax / logWasteFactor;
>-
>-    static const size_t logSizeClassCount = (log2(smallMax) - log2(maskSizeClassMax)) * logWasteFactor;
>-
>-    inline size_t logSizeClass(size_t size)
>-    {
>-        size_t base = log2(size - 1) - log2(maskSizeClassMax);
>-        size_t offset = (size - 1 - (maskSizeClassMax << base));
>-        return base * logWasteFactor + offset / (logAlignmentMin << base);
>-    }
>-
>-    inline size_t logObjectSize(size_t logSizeClass)
>-    {
>-        size_t base = logSizeClass / logWasteFactor;
>-        size_t offset = logSizeClass % logWasteFactor;
>-        return (maskSizeClassMax << base) + (offset + 1) * (logAlignmentMin << base);
>-    }
>-
>-    static const size_t sizeClassCount = maskSizeClassCount + logSizeClassCount;
>-
>-    inline size_t sizeClass(size_t size)
>-    {
>-        if (size <= maskSizeClassMax)
>-            return maskSizeClass(size);
>-        return maskSizeClassCount + logSizeClass(size);
>-    }
>-
>-    inline size_t objectSize(size_t sizeClass)
>-    {
>-        if (sizeClass < maskSizeClassCount)
>-            return maskObjectSize(sizeClass);
>-        return logObjectSize(sizeClass - maskSizeClassCount);
>-    }
>-    
>-    inline size_t pageSize(size_t pageClass)
>-    {
>-        return (pageClass + 1) * smallPageSize;
>-    }
>+static constexpr size_t kB = 1024;
>+static constexpr size_t MB = kB * kB;
>+static constexpr size_t GB = kB * kB * kB;
>+
>+static constexpr size_t alignment = 8;
>+static constexpr size_t alignmentMask = alignment - 1ul;
>+
>+static constexpr size_t chunkSize = 1 * MB;
>+static constexpr size_t chunkMask = ~(chunkSize - 1ul);
>+
>+static constexpr size_t smallLineSize = 256;
>+static constexpr size_t smallPageSize = 4 * kB;
>+static constexpr size_t smallPageLineCount = smallPageSize / smallLineSize;
>+
>+static constexpr size_t maskSizeClassMax = 512;
>+static constexpr size_t smallMax = 32 * kB;
>+
>+static constexpr size_t pageSizeMax = smallMax * 2;
>+static constexpr size_t pageClassCount = pageSizeMax / smallPageSize;
>+
>+static constexpr size_t pageSizeWasteFactor = 8;
>+static constexpr size_t logWasteFactor = 8;
>+
>+static constexpr size_t largeAlignment = smallMax / pageSizeWasteFactor;
>+static constexpr size_t largeAlignmentMask = largeAlignment - 1;
>+
>+static constexpr size_t deallocatorLogCapacity = 512;
>+static constexpr size_t bumpRangeCacheCapacity = 3;
>+
>+static constexpr size_t scavengerBytesPerMemoryPressureCheck = 16 * MB;
>+static constexpr double memoryPressureThreshold = 0.75;
>+
>+static constexpr size_t maskSizeClassCount = maskSizeClassMax / alignment;
>+
>+constexpr size_t maskSizeClass(size_t size)
>+{
>+    // We mask to accommodate zero.
>+    return mask((size - 1) / alignment, maskSizeClassCount - 1);
>+}
>+
>+inline size_t maskObjectSize(size_t maskSizeClass)
>+{
>+    return (maskSizeClass + 1) * alignment;
>+}
>+
>+static constexpr size_t logAlignmentMin = maskSizeClassMax / logWasteFactor;
>+
>+static constexpr size_t logSizeClassCount = (log2(smallMax) - log2(maskSizeClassMax)) * logWasteFactor;
>+
>+inline size_t logSizeClass(size_t size)
>+{
>+    size_t base = log2(size - 1) - log2(maskSizeClassMax);
>+    size_t offset = (size - 1 - (maskSizeClassMax << base));
>+    return base * logWasteFactor + offset / (logAlignmentMin << base);
>+}
>+
>+inline size_t logObjectSize(size_t logSizeClass)
>+{
>+    size_t base = logSizeClass / logWasteFactor;
>+    size_t offset = logSizeClass % logWasteFactor;
>+    return (maskSizeClassMax << base) + (offset + 1) * (logAlignmentMin << base);
>+}
>+
>+static constexpr size_t sizeClassCount = maskSizeClassCount + logSizeClassCount;
>+
>+inline size_t sizeClass(size_t size)
>+{
>+    if (size <= maskSizeClassMax)
>+        return maskSizeClass(size);
>+    return maskSizeClassCount + logSizeClass(size);
>+}
>+
>+inline size_t objectSize(size_t sizeClass)
>+{
>+    if (sizeClass < maskSizeClassCount)
>+        return maskObjectSize(sizeClass);
>+    return logObjectSize(sizeClass - maskSizeClassCount);
>+}
>+
>+inline size_t pageSize(size_t pageClass)
>+{
>+    return (pageClass + 1) * smallPageSize;
>+}
> }
> 
> using namespace Sizes;

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Attachments on bug 193523: 359341 | 359396 | 359409 | 359410 | 359425 | 359430 | 359501 | 359532