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Repatch.cpp
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933 lines (788 loc) · 37.7 KB
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/*
* Copyright (C) 2011-2015 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 "Repatch.h"
#if ENABLE(JIT)
#include "BinarySwitch.h"
#include "CCallHelpers.h"
#include "CallFrameShuffler.h"
#include "DFGOperations.h"
#include "DFGSpeculativeJIT.h"
#include "FTLThunks.h"
#include "GCAwareJITStubRoutine.h"
#include "GetterSetter.h"
#include "JIT.h"
#include "JITInlines.h"
#include "LinkBuffer.h"
#include "JSCInlines.h"
#include "PolymorphicAccess.h"
#include "RegExpMatchesArray.h"
#include "ScratchRegisterAllocator.h"
#include "StackAlignment.h"
#include "StructureRareDataInlines.h"
#include "StructureStubClearingWatchpoint.h"
#include "ThunkGenerators.h"
#include <wtf/CommaPrinter.h>
#include <wtf/ListDump.h>
#include <wtf/StringPrintStream.h>
namespace JSC {
// Beware: in this code, it is not safe to assume anything about the following registers
// that would ordinarily have well-known values:
// - tagTypeNumberRegister
// - tagMaskRegister
static FunctionPtr readCallTarget(CodeBlock* codeBlock, CodeLocationCall call)
{
FunctionPtr result = MacroAssembler::readCallTarget(call);
#if ENABLE(FTL_JIT)
if (codeBlock->jitType() == JITCode::FTLJIT) {
return FunctionPtr(codeBlock->vm()->ftlThunks->keyForSlowPathCallThunk(
MacroAssemblerCodePtr::createFromExecutableAddress(
result.executableAddress())).callTarget());
}
#else
UNUSED_PARAM(codeBlock);
#endif // ENABLE(FTL_JIT)
return result;
}
static void repatchCall(CodeBlock* codeBlock, CodeLocationCall call, FunctionPtr newCalleeFunction)
{
#if ENABLE(FTL_JIT)
if (codeBlock->jitType() == JITCode::FTLJIT) {
VM& vm = *codeBlock->vm();
FTL::Thunks& thunks = *vm.ftlThunks;
FTL::SlowPathCallKey key = thunks.keyForSlowPathCallThunk(
MacroAssemblerCodePtr::createFromExecutableAddress(
MacroAssembler::readCallTarget(call).executableAddress()));
key = key.withCallTarget(newCalleeFunction.executableAddress());
newCalleeFunction = FunctionPtr(
thunks.getSlowPathCallThunk(vm, key).code().executableAddress());
}
#else // ENABLE(FTL_JIT)
UNUSED_PARAM(codeBlock);
#endif // ENABLE(FTL_JIT)
MacroAssembler::repatchCall(call, newCalleeFunction);
}
static void repatchByIdSelfAccess(
CodeBlock* codeBlock, StructureStubInfo& stubInfo, Structure* structure,
PropertyOffset offset, const FunctionPtr &slowPathFunction,
bool compact)
{
// Only optimize once!
repatchCall(codeBlock, stubInfo.callReturnLocation, slowPathFunction);
// Patch the structure check & the offset of the load.
MacroAssembler::repatchInt32(
stubInfo.callReturnLocation.dataLabel32AtOffset(-(intptr_t)stubInfo.patch.deltaCheckImmToCall),
bitwise_cast<int32_t>(structure->id()));
CodeLocationConvertibleLoad convertibleLoad = stubInfo.callReturnLocation.convertibleLoadAtOffset(stubInfo.patch.deltaCallToStorageLoad);
if (isOutOfLineOffset(offset))
MacroAssembler::replaceWithLoad(convertibleLoad);
else
MacroAssembler::replaceWithAddressComputation(convertibleLoad);
#if USE(JSVALUE64)
if (compact)
MacroAssembler::repatchCompact(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToLoadOrStore), offsetRelativeToPatchedStorage(offset));
else
MacroAssembler::repatchInt32(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToLoadOrStore), offsetRelativeToPatchedStorage(offset));
#elif USE(JSVALUE32_64)
if (compact) {
MacroAssembler::repatchCompact(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToTagLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
MacroAssembler::repatchCompact(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToPayloadLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
} else {
MacroAssembler::repatchInt32(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToTagLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
MacroAssembler::repatchInt32(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToPayloadLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
}
#endif
}
static void resetGetByIDCheckAndLoad(StructureStubInfo& stubInfo)
{
CodeLocationDataLabel32 structureLabel = stubInfo.callReturnLocation.dataLabel32AtOffset(-(intptr_t)stubInfo.patch.deltaCheckImmToCall);
if (MacroAssembler::canJumpReplacePatchableBranch32WithPatch()) {
MacroAssembler::revertJumpReplacementToPatchableBranch32WithPatch(
MacroAssembler::startOfPatchableBranch32WithPatchOnAddress(structureLabel),
MacroAssembler::Address(
static_cast<MacroAssembler::RegisterID>(stubInfo.patch.baseGPR),
JSCell::structureIDOffset()),
static_cast<int32_t>(unusedPointer));
}
MacroAssembler::repatchInt32(structureLabel, static_cast<int32_t>(unusedPointer));
#if USE(JSVALUE64)
MacroAssembler::repatchCompact(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToLoadOrStore), 0);
#else
MacroAssembler::repatchCompact(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToTagLoadOrStore), 0);
MacroAssembler::repatchCompact(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToPayloadLoadOrStore), 0);
#endif
}
static void resetPutByIDCheckAndLoad(StructureStubInfo& stubInfo)
{
CodeLocationDataLabel32 structureLabel = stubInfo.callReturnLocation.dataLabel32AtOffset(-(intptr_t)stubInfo.patch.deltaCheckImmToCall);
if (MacroAssembler::canJumpReplacePatchableBranch32WithPatch()) {
MacroAssembler::revertJumpReplacementToPatchableBranch32WithPatch(
MacroAssembler::startOfPatchableBranch32WithPatchOnAddress(structureLabel),
MacroAssembler::Address(
static_cast<MacroAssembler::RegisterID>(stubInfo.patch.baseGPR),
JSCell::structureIDOffset()),
static_cast<int32_t>(unusedPointer));
}
MacroAssembler::repatchInt32(structureLabel, static_cast<int32_t>(unusedPointer));
#if USE(JSVALUE64)
MacroAssembler::repatchInt32(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToLoadOrStore), 0);
#else
MacroAssembler::repatchInt32(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToTagLoadOrStore), 0);
MacroAssembler::repatchInt32(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToPayloadLoadOrStore), 0);
#endif
}
static void replaceWithJump(StructureStubInfo& stubInfo, const MacroAssemblerCodePtr target)
{
if (MacroAssembler::canJumpReplacePatchableBranch32WithPatch()) {
MacroAssembler::replaceWithJump(
MacroAssembler::startOfPatchableBranch32WithPatchOnAddress(
stubInfo.callReturnLocation.dataLabel32AtOffset(
-(intptr_t)stubInfo.patch.deltaCheckImmToCall)),
CodeLocationLabel(target));
return;
}
resetGetByIDCheckAndLoad(stubInfo);
MacroAssembler::repatchJump(
stubInfo.callReturnLocation.jumpAtOffset(
stubInfo.patch.deltaCallToJump),
CodeLocationLabel(target));
}
enum InlineCacheAction {
GiveUpOnCache,
RetryCacheLater,
AttemptToCache
};
static InlineCacheAction actionForCell(VM& vm, JSCell* cell)
{
Structure* structure = cell->structure(vm);
TypeInfo typeInfo = structure->typeInfo();
if (typeInfo.prohibitsPropertyCaching())
return GiveUpOnCache;
if (structure->isUncacheableDictionary()) {
if (structure->hasBeenFlattenedBefore())
return GiveUpOnCache;
// Flattening could have changed the offset, so return early for another try.
asObject(cell)->flattenDictionaryObject(vm);
return RetryCacheLater;
}
if (!structure->propertyAccessesAreCacheable())
return GiveUpOnCache;
return AttemptToCache;
}
static bool forceICFailure(ExecState*)
{
return Options::forceICFailure();
}
static InlineCacheAction tryCacheGetByID(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
if (forceICFailure(exec))
return GiveUpOnCache;
// FIXME: Cache property access for immediates.
if (!baseValue.isCell())
return GiveUpOnCache;
CodeBlock* codeBlock = exec->codeBlock();
ScriptExecutable* owner = codeBlock->ownerScriptExecutable();
VM& vm = exec->vm();
std::unique_ptr<AccessCase> newCase;
if (isJSArray(baseValue) && propertyName == exec->propertyNames().length)
newCase = AccessCase::getLength(vm, owner, AccessCase::ArrayLength);
else if (isJSString(baseValue) && propertyName == exec->propertyNames().length)
newCase = AccessCase::getLength(vm, owner, AccessCase::StringLength);
else {
if (!slot.isCacheable() && !slot.isUnset())
return GiveUpOnCache;
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure(vm);
bool loadTargetFromProxy = false;
if (baseCell->type() == PureForwardingProxyType) {
baseValue = jsCast<JSProxy*>(baseCell)->target();
baseCell = baseValue.asCell();
structure = baseCell->structure(vm);
loadTargetFromProxy = true;
}
InlineCacheAction action = actionForCell(vm, baseCell);
if (action != AttemptToCache)
return action;
// Optimize self access.
if (stubInfo.cacheType == CacheType::Unset
&& slot.isCacheableValue()
&& slot.slotBase() == baseValue
&& !slot.watchpointSet()
&& MacroAssembler::isCompactPtrAlignedAddressOffset(maxOffsetRelativeToPatchedStorage(slot.cachedOffset()))
&& action == AttemptToCache
&& !structure->needImpurePropertyWatchpoint()
&& !loadTargetFromProxy) {
structure->startWatchingPropertyForReplacements(vm, slot.cachedOffset());
repatchByIdSelfAccess(codeBlock, stubInfo, structure, slot.cachedOffset(), operationGetByIdOptimize, true);
stubInfo.initGetByIdSelf(vm, codeBlock->ownerExecutable(), structure, slot.cachedOffset());
return RetryCacheLater;
}
PropertyOffset offset = slot.isUnset() ? invalidOffset : slot.cachedOffset();
ObjectPropertyConditionSet conditionSet;
if (slot.isUnset() || slot.slotBase() != baseValue) {
if (structure->typeInfo().prohibitsPropertyCaching() || structure->isDictionary())
return GiveUpOnCache;
if (slot.isUnset()) {
conditionSet = generateConditionsForPropertyMiss(
vm, codeBlock->ownerExecutable(), exec, structure, propertyName.impl());
} else {
conditionSet = generateConditionsForPrototypePropertyHit(
vm, codeBlock->ownerExecutable(), exec, structure, slot.slotBase(),
propertyName.impl());
}
if (!conditionSet.isValid())
return GiveUpOnCache;
offset = slot.isUnset() ? invalidOffset : conditionSet.slotBaseCondition().offset();
}
AccessCase::AccessType type;
if (slot.isCacheableValue())
type = AccessCase::Load;
else if (slot.isUnset())
type = AccessCase::Miss;
else if (slot.isCacheableGetter())
type = AccessCase::Getter;
else
type = AccessCase::CustomGetter;
newCase = AccessCase::get(
vm, owner, type, offset, structure, conditionSet, loadTargetFromProxy,
slot.watchpointSet(), slot.isCacheableCustom() ? slot.customGetter() : nullptr,
slot.isCacheableCustom() ? slot.slotBase() : nullptr);
}
MacroAssemblerCodePtr codePtr = stubInfo.addAccessCase(
vm, codeBlock, propertyName, WTF::move(newCase));
if (!codePtr)
return GiveUpOnCache;
replaceWithJump(stubInfo, codePtr);
return RetryCacheLater;
}
void repatchGetByID(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
GCSafeConcurrentJITLocker locker(exec->codeBlock()->m_lock, exec->vm().heap);
if (tryCacheGetByID(exec, baseValue, propertyName, slot, stubInfo) == GiveUpOnCache)
repatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationGetById);
}
static V_JITOperation_ESsiJJI appropriateGenericPutByIdFunction(const PutPropertySlot &slot, PutKind putKind)
{
if (slot.isStrictMode()) {
if (putKind == Direct)
return operationPutByIdDirectStrict;
return operationPutByIdStrict;
}
if (putKind == Direct)
return operationPutByIdDirectNonStrict;
return operationPutByIdNonStrict;
}
static V_JITOperation_ESsiJJI appropriateOptimizingPutByIdFunction(const PutPropertySlot &slot, PutKind putKind)
{
if (slot.isStrictMode()) {
if (putKind == Direct)
return operationPutByIdDirectStrictOptimize;
return operationPutByIdStrictOptimize;
}
if (putKind == Direct)
return operationPutByIdDirectNonStrictOptimize;
return operationPutByIdNonStrictOptimize;
}
static InlineCacheAction tryCachePutByID(ExecState* exec, JSValue baseValue, Structure* structure, const Identifier& ident, const PutPropertySlot& slot, StructureStubInfo& stubInfo, PutKind putKind)
{
if (forceICFailure(exec))
return GiveUpOnCache;
CodeBlock* codeBlock = exec->codeBlock();
ScriptExecutable* owner = codeBlock->ownerScriptExecutable();
VM& vm = exec->vm();
if (!baseValue.isCell())
return GiveUpOnCache;
if (!slot.isCacheablePut() && !slot.isCacheableCustom() && !slot.isCacheableSetter())
return GiveUpOnCache;
if (!structure->propertyAccessesAreCacheable())
return GiveUpOnCache;
std::unique_ptr<AccessCase> newCase;
if (slot.base() == baseValue && slot.isCacheablePut()) {
if (slot.type() == PutPropertySlot::ExistingProperty) {
structure->didCachePropertyReplacement(vm, slot.cachedOffset());
ptrdiff_t offsetToPatchedStorage = offsetRelativeToPatchedStorage(slot.cachedOffset());
if (stubInfo.cacheType == CacheType::Unset
&& MacroAssembler::isPtrAlignedAddressOffset(offsetToPatchedStorage)
&& !structure->needImpurePropertyWatchpoint()
&& !structure->inferredTypeFor(ident.impl())) {
repatchByIdSelfAccess(
codeBlock, stubInfo, structure, slot.cachedOffset(),
appropriateOptimizingPutByIdFunction(slot, putKind), false);
stubInfo.initPutByIdReplace(
vm, codeBlock->ownerExecutable(), structure, slot.cachedOffset());
return RetryCacheLater;
}
newCase = AccessCase::replace(vm, owner, structure, slot.cachedOffset());
} else {
ASSERT(slot.type() == PutPropertySlot::NewProperty);
if (!structure->isObject() || structure->isDictionary())
return GiveUpOnCache;
PropertyOffset offset;
Structure* newStructure =
Structure::addPropertyTransitionToExistingStructureConcurrently(
structure, ident.impl(), 0, offset);
if (!newStructure || !newStructure->propertyAccessesAreCacheable())
return GiveUpOnCache;
ASSERT(newStructure->previousID() == structure);
ASSERT(!newStructure->isDictionary());
ASSERT(newStructure->isObject());
ObjectPropertyConditionSet conditionSet;
if (putKind == NotDirect) {
conditionSet =
generateConditionsForPropertySetterMiss(
vm, owner, exec, newStructure, ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
}
newCase = AccessCase::transition(vm, owner, structure, newStructure, offset, conditionSet);
}
} else if (slot.isCacheableCustom() || slot.isCacheableSetter()) {
if (slot.isCacheableCustom()) {
ObjectPropertyConditionSet conditionSet;
if (slot.base() != baseValue) {
conditionSet =
generateConditionsForPrototypePropertyHitCustom(
vm, owner, exec, structure, slot.base(), ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
}
newCase = AccessCase::setter(
vm, owner, AccessCase::CustomSetter, structure, invalidOffset, conditionSet,
slot.customSetter(), slot.base());
} else {
ObjectPropertyConditionSet conditionSet;
PropertyOffset offset;
if (slot.base() != baseValue) {
conditionSet =
generateConditionsForPrototypePropertyHit(
vm, owner, exec, structure, slot.base(), ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
offset = conditionSet.slotBaseCondition().offset();
} else
offset = slot.cachedOffset();
newCase = AccessCase::setter(
vm, owner, AccessCase::Setter, structure, offset, conditionSet);
}
}
MacroAssemblerCodePtr codePtr = stubInfo.addAccessCase(
vm, codeBlock, ident, WTF::move(newCase));
if (!codePtr)
return GiveUpOnCache;
resetPutByIDCheckAndLoad(stubInfo);
MacroAssembler::repatchJump(
stubInfo.callReturnLocation.jumpAtOffset(
stubInfo.patch.deltaCallToJump),
CodeLocationLabel(codePtr));
return RetryCacheLater;
}
void repatchPutByID(ExecState* exec, JSValue baseValue, Structure* structure, const Identifier& propertyName, const PutPropertySlot& slot, StructureStubInfo& stubInfo, PutKind putKind)
{
GCSafeConcurrentJITLocker locker(exec->codeBlock()->m_lock, exec->vm().heap);
if (tryCachePutByID(exec, baseValue, structure, propertyName, slot, stubInfo, putKind) == GiveUpOnCache)
repatchCall(exec->codeBlock(), stubInfo.callReturnLocation, appropriateGenericPutByIdFunction(slot, putKind));
}
static InlineCacheAction tryRepatchIn(
ExecState* exec, JSCell* base, const Identifier& ident, bool wasFound,
const PropertySlot& slot, StructureStubInfo& stubInfo)
{
if (forceICFailure(exec))
return GiveUpOnCache;
if (!base->structure()->propertyAccessesAreCacheable())
return GiveUpOnCache;
if (wasFound) {
if (!slot.isCacheable())
return GiveUpOnCache;
}
CodeBlock* codeBlock = exec->codeBlock();
ScriptExecutable* owner = codeBlock->ownerScriptExecutable();
VM& vm = exec->vm();
Structure* structure = base->structure(vm);
ObjectPropertyConditionSet conditionSet;
if (wasFound) {
if (slot.slotBase() != base) {
conditionSet = generateConditionsForPrototypePropertyHit(
vm, codeBlock->ownerExecutable(), exec, structure, slot.slotBase(), ident.impl());
}
} else {
conditionSet = generateConditionsForPropertyMiss(
vm, codeBlock->ownerExecutable(), exec, structure, ident.impl());
}
if (!conditionSet.isValid())
return GiveUpOnCache;
std::unique_ptr<AccessCase> newCase = AccessCase::in(
vm, owner, wasFound ? AccessCase::InHit : AccessCase::InMiss, structure, conditionSet);
MacroAssemblerCodePtr codePtr = stubInfo.addAccessCase(vm, codeBlock, ident, WTF::move(newCase));
if (!codePtr)
return GiveUpOnCache;
MacroAssembler::repatchJump(
stubInfo.callReturnLocation.jumpAtOffset(stubInfo.patch.deltaCallToJump),
CodeLocationLabel(codePtr));
return RetryCacheLater;
}
void repatchIn(
ExecState* exec, JSCell* base, const Identifier& ident, bool wasFound,
const PropertySlot& slot, StructureStubInfo& stubInfo)
{
if (tryRepatchIn(exec, base, ident, wasFound, slot, stubInfo) == GiveUpOnCache)
repatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationIn);
}
static void linkSlowFor(VM*, CallLinkInfo& callLinkInfo, MacroAssemblerCodeRef codeRef)
{
MacroAssembler::repatchNearCall(callLinkInfo.callReturnLocation(), CodeLocationLabel(codeRef.code()));
}
static void linkSlowFor(VM* vm, CallLinkInfo& callLinkInfo, ThunkGenerator generator)
{
linkSlowFor(vm, callLinkInfo, vm->getCTIStub(generator));
}
static void linkSlowFor(VM* vm, CallLinkInfo& callLinkInfo)
{
MacroAssemblerCodeRef virtualThunk = virtualThunkFor(vm, callLinkInfo);
linkSlowFor(vm, callLinkInfo, virtualThunk);
callLinkInfo.setSlowStub(createJITStubRoutine(virtualThunk, *vm, nullptr, true));
}
void linkFor(
ExecState* exec, CallLinkInfo& callLinkInfo, CodeBlock* calleeCodeBlock,
JSFunction* callee, MacroAssemblerCodePtr codePtr)
{
ASSERT(!callLinkInfo.stub());
CodeBlock* callerCodeBlock = exec->callerFrame()->codeBlock();
VM* vm = callerCodeBlock->vm();
ASSERT(!callLinkInfo.isLinked());
callLinkInfo.setCallee(exec->callerFrame()->vm(), callLinkInfo.hotPathBegin(), callerCodeBlock->ownerExecutable(), callee);
callLinkInfo.setLastSeenCallee(exec->callerFrame()->vm(), callerCodeBlock->ownerExecutable(), callee);
if (shouldShowDisassemblyFor(callerCodeBlock))
dataLog("Linking call in ", *callerCodeBlock, " at ", callLinkInfo.codeOrigin(), " to ", pointerDump(calleeCodeBlock), ", entrypoint at ", codePtr, "\n");
MacroAssembler::repatchNearCall(callLinkInfo.hotPathOther(), CodeLocationLabel(codePtr));
if (calleeCodeBlock)
calleeCodeBlock->linkIncomingCall(exec->callerFrame(), &callLinkInfo);
if (callLinkInfo.specializationKind() == CodeForCall && callLinkInfo.allowStubs()) {
linkSlowFor(vm, callLinkInfo, linkPolymorphicCallThunkGenerator);
return;
}
linkSlowFor(vm, callLinkInfo);
}
void linkSlowFor(
ExecState* exec, CallLinkInfo& callLinkInfo)
{
CodeBlock* callerCodeBlock = exec->callerFrame()->codeBlock();
VM* vm = callerCodeBlock->vm();
linkSlowFor(vm, callLinkInfo);
}
static void revertCall(VM* vm, CallLinkInfo& callLinkInfo, MacroAssemblerCodeRef codeRef)
{
MacroAssembler::revertJumpReplacementToBranchPtrWithPatch(
MacroAssembler::startOfBranchPtrWithPatchOnRegister(callLinkInfo.hotPathBegin()),
static_cast<MacroAssembler::RegisterID>(callLinkInfo.calleeGPR()), 0);
linkSlowFor(vm, callLinkInfo, codeRef);
callLinkInfo.clearSeen();
callLinkInfo.clearCallee();
callLinkInfo.clearStub();
callLinkInfo.clearSlowStub();
if (callLinkInfo.isOnList())
callLinkInfo.remove();
}
void unlinkFor(VM& vm, CallLinkInfo& callLinkInfo)
{
if (Options::showDisassembly())
dataLog("Unlinking call from ", callLinkInfo.callReturnLocation(), "\n");
revertCall(&vm, callLinkInfo, vm.getCTIStub(linkCallThunkGenerator));
}
void linkVirtualFor(
ExecState* exec, CallLinkInfo& callLinkInfo)
{
CodeBlock* callerCodeBlock = exec->callerFrame()->codeBlock();
VM* vm = callerCodeBlock->vm();
if (shouldShowDisassemblyFor(callerCodeBlock))
dataLog("Linking virtual call at ", *callerCodeBlock, " ", exec->callerFrame()->codeOrigin(), "\n");
MacroAssemblerCodeRef virtualThunk = virtualThunkFor(vm, callLinkInfo);
revertCall(vm, callLinkInfo, virtualThunk);
callLinkInfo.setSlowStub(createJITStubRoutine(virtualThunk, *vm, nullptr, true));
}
namespace {
struct CallToCodePtr {
CCallHelpers::Call call;
MacroAssemblerCodePtr codePtr;
};
} // annonymous namespace
void linkPolymorphicCall(
ExecState* exec, CallLinkInfo& callLinkInfo, CallVariant newVariant)
{
RELEASE_ASSERT(callLinkInfo.allowStubs());
// Currently we can't do anything for non-function callees.
// https://bugs.webkit.org/show_bug.cgi?id=140685
if (!newVariant || !newVariant.executable()) {
linkVirtualFor(exec, callLinkInfo);
return;
}
CodeBlock* callerCodeBlock = exec->callerFrame()->codeBlock();
VM* vm = callerCodeBlock->vm();
CallVariantList list;
if (PolymorphicCallStubRoutine* stub = callLinkInfo.stub())
list = stub->variants();
else if (JSFunction* oldCallee = callLinkInfo.callee())
list = CallVariantList{ CallVariant(oldCallee) };
list = variantListWithVariant(list, newVariant);
// If there are any closure calls then it makes sense to treat all of them as closure calls.
// This makes switching on callee cheaper. It also produces profiling that's easier on the DFG;
// the DFG doesn't really want to deal with a combination of closure and non-closure callees.
bool isClosureCall = false;
for (CallVariant variant : list) {
if (variant.isClosureCall()) {
list = despecifiedVariantList(list);
isClosureCall = true;
break;
}
}
if (isClosureCall)
callLinkInfo.setHasSeenClosure();
Vector<PolymorphicCallCase> callCases;
// Figure out what our cases are.
for (CallVariant variant : list) {
CodeBlock* codeBlock;
if (variant.executable()->isHostFunction())
codeBlock = nullptr;
else {
ExecutableBase* executable = variant.executable();
#if ENABLE(WEBASSEMBLY)
if (executable->isWebAssemblyExecutable())
codeBlock = jsCast<WebAssemblyExecutable*>(executable)->codeBlockForCall();
else
#endif
codeBlock = jsCast<FunctionExecutable*>(executable)->codeBlockForCall();
// If we cannot handle a callee, assume that it's better for this whole thing to be a
// virtual call.
if (exec->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()) || callLinkInfo.isVarargs()) {
linkVirtualFor(exec, callLinkInfo);
return;
}
}
callCases.append(PolymorphicCallCase(variant, codeBlock));
}
// If we are over the limit, just use a normal virtual call.
unsigned maxPolymorphicCallVariantListSize;
if (callerCodeBlock->jitType() == JITCode::topTierJIT())
maxPolymorphicCallVariantListSize = Options::maxPolymorphicCallVariantListSizeForTopTier();
else
maxPolymorphicCallVariantListSize = Options::maxPolymorphicCallVariantListSize();
if (list.size() > maxPolymorphicCallVariantListSize) {
linkVirtualFor(exec, callLinkInfo);
return;
}
GPRReg calleeGPR = static_cast<GPRReg>(callLinkInfo.calleeGPR());
CCallHelpers stubJit(vm, callerCodeBlock);
CCallHelpers::JumpList slowPath;
std::unique_ptr<CallFrameShuffler> frameShuffler;
if (callLinkInfo.frameShuffleData()) {
ASSERT(callLinkInfo.isTailCall());
frameShuffler = std::make_unique<CallFrameShuffler>(stubJit, *callLinkInfo.frameShuffleData());
#if USE(JSVALUE32_64)
// We would have already checked that the callee is a cell, and we can
// use the additional register this buys us.
frameShuffler->assumeCalleeIsCell();
#endif
frameShuffler->lockGPR(calleeGPR);
}
GPRReg comparisonValueGPR;
if (isClosureCall) {
GPRReg scratchGPR;
if (frameShuffler)
scratchGPR = frameShuffler->acquireGPR();
else
scratchGPR = AssemblyHelpers::selectScratchGPR(calleeGPR);
// Verify that we have a function and stash the executable in scratchGPR.
#if USE(JSVALUE64)
// We can't rely on tagMaskRegister being set, so we do this the hard
// way.
stubJit.move(MacroAssembler::TrustedImm64(TagMask), scratchGPR);
slowPath.append(stubJit.branchTest64(CCallHelpers::NonZero, calleeGPR, scratchGPR));
#else
// We would have already checked that the callee is a cell.
#endif
slowPath.append(
stubJit.branch8(
CCallHelpers::NotEqual,
CCallHelpers::Address(calleeGPR, JSCell::typeInfoTypeOffset()),
CCallHelpers::TrustedImm32(JSFunctionType)));
stubJit.loadPtr(
CCallHelpers::Address(calleeGPR, JSFunction::offsetOfExecutable()),
scratchGPR);
comparisonValueGPR = scratchGPR;
} else
comparisonValueGPR = calleeGPR;
Vector<int64_t> caseValues(callCases.size());
Vector<CallToCodePtr> calls(callCases.size());
std::unique_ptr<uint32_t[]> fastCounts;
if (callerCodeBlock->jitType() != JITCode::topTierJIT())
fastCounts = std::make_unique<uint32_t[]>(callCases.size());
for (size_t i = 0; i < callCases.size(); ++i) {
if (fastCounts)
fastCounts[i] = 0;
CallVariant variant = callCases[i].variant();
int64_t newCaseValue;
if (isClosureCall)
newCaseValue = bitwise_cast<intptr_t>(variant.executable());
else
newCaseValue = bitwise_cast<intptr_t>(variant.function());
if (!ASSERT_DISABLED) {
for (size_t j = 0; j < i; ++j) {
if (caseValues[j] != newCaseValue)
continue;
dataLog("ERROR: Attempt to add duplicate case value.\n");
dataLog("Existing case values: ");
CommaPrinter comma;
for (size_t k = 0; k < i; ++k)
dataLog(comma, caseValues[k]);
dataLog("\n");
dataLog("Attempting to add: ", newCaseValue, "\n");
dataLog("Variant list: ", listDump(callCases), "\n");
RELEASE_ASSERT_NOT_REACHED();
}
}
caseValues[i] = newCaseValue;
}
GPRReg fastCountsBaseGPR;
if (frameShuffler)
fastCountsBaseGPR = frameShuffler->acquireGPR();
else {
fastCountsBaseGPR =
AssemblyHelpers::selectScratchGPR(calleeGPR, comparisonValueGPR, GPRInfo::regT3);
}
stubJit.move(CCallHelpers::TrustedImmPtr(fastCounts.get()), fastCountsBaseGPR);
BinarySwitch binarySwitch(comparisonValueGPR, caseValues, BinarySwitch::IntPtr);
CCallHelpers::JumpList done;
while (binarySwitch.advance(stubJit)) {
size_t caseIndex = binarySwitch.caseIndex();
CallVariant variant = callCases[caseIndex].variant();
ASSERT(variant.executable()->hasJITCodeForCall());
MacroAssemblerCodePtr codePtr =
variant.executable()->generatedJITCodeForCall()->addressForCall(ArityCheckNotRequired);
if (fastCounts) {
stubJit.add32(
CCallHelpers::TrustedImm32(1),
CCallHelpers::Address(fastCountsBaseGPR, caseIndex * sizeof(uint32_t)));
}
if (frameShuffler) {
CallFrameShuffler(stubJit, frameShuffler->snapshot()).prepareForTailCall();
calls[caseIndex].call = stubJit.nearTailCall();
} else if (callLinkInfo.isTailCall()) {
stubJit.emitRestoreCalleeSaves();
stubJit.prepareForTailCallSlow();
calls[caseIndex].call = stubJit.nearTailCall();
} else
calls[caseIndex].call = stubJit.nearCall();
calls[caseIndex].codePtr = codePtr;
done.append(stubJit.jump());
}
slowPath.link(&stubJit);
binarySwitch.fallThrough().link(&stubJit);
if (frameShuffler) {
frameShuffler->releaseGPR(calleeGPR);
frameShuffler->releaseGPR(comparisonValueGPR);
frameShuffler->releaseGPR(fastCountsBaseGPR);
#if USE(JSVALUE32_64)
frameShuffler->setCalleeJSValueRegs(JSValueRegs(GPRInfo::regT1, GPRInfo::regT0));
#else
frameShuffler->setCalleeJSValueRegs(JSValueRegs(GPRInfo::regT0));
#endif
frameShuffler->prepareForSlowPath();
} else {
stubJit.move(calleeGPR, GPRInfo::regT0);
#if USE(JSVALUE32_64)
stubJit.move(CCallHelpers::TrustedImm32(JSValue::CellTag), GPRInfo::regT1);
#endif
}
stubJit.move(CCallHelpers::TrustedImmPtr(&callLinkInfo), GPRInfo::regT2);
stubJit.move(CCallHelpers::TrustedImmPtr(callLinkInfo.callReturnLocation().executableAddress()), GPRInfo::regT4);
stubJit.restoreReturnAddressBeforeReturn(GPRInfo::regT4);
AssemblyHelpers::Jump slow = stubJit.jump();
LinkBuffer patchBuffer(*vm, stubJit, callerCodeBlock, JITCompilationCanFail);
if (patchBuffer.didFailToAllocate()) {
linkVirtualFor(exec, callLinkInfo);
return;
}
RELEASE_ASSERT(callCases.size() == calls.size());
for (CallToCodePtr callToCodePtr : calls) {
patchBuffer.link(
callToCodePtr.call, FunctionPtr(callToCodePtr.codePtr.executableAddress()));
}
if (JITCode::isOptimizingJIT(callerCodeBlock->jitType()))
patchBuffer.link(done, callLinkInfo.callReturnLocation().labelAtOffset(0));
else
patchBuffer.link(done, callLinkInfo.hotPathOther().labelAtOffset(0));
patchBuffer.link(slow, CodeLocationLabel(vm->getCTIStub(linkPolymorphicCallThunkGenerator).code()));
RefPtr<PolymorphicCallStubRoutine> stubRoutine = adoptRef(new PolymorphicCallStubRoutine(
FINALIZE_CODE_FOR(
callerCodeBlock, patchBuffer,
("Polymorphic call stub for %s, return point %p, targets %s",
toCString(*callerCodeBlock).data(), callLinkInfo.callReturnLocation().labelAtOffset(0).executableAddress(),
toCString(listDump(callCases)).data())),
*vm, callerCodeBlock->ownerExecutable(), exec->callerFrame(), callLinkInfo, callCases,
WTF::move(fastCounts)));
MacroAssembler::replaceWithJump(
MacroAssembler::startOfBranchPtrWithPatchOnRegister(callLinkInfo.hotPathBegin()),
CodeLocationLabel(stubRoutine->code().code()));
// The original slow path is unreachable on 64-bits, but still
// reachable on 32-bits since a non-cell callee will always
// trigger the slow path
linkSlowFor(vm, callLinkInfo);
// If there had been a previous stub routine, that one will die as soon as the GC runs and sees
// that it's no longer on stack.
callLinkInfo.setStub(stubRoutine.release());
// The call link info no longer has a call cache apart from the jump to the polymorphic call
// stub.
if (callLinkInfo.isOnList())
callLinkInfo.remove();
}
void resetGetByID(CodeBlock* codeBlock, StructureStubInfo& stubInfo)
{
repatchCall(codeBlock, stubInfo.callReturnLocation, operationGetByIdOptimize);
resetGetByIDCheckAndLoad(stubInfo);
MacroAssembler::repatchJump(stubInfo.callReturnLocation.jumpAtOffset(stubInfo.patch.deltaCallToJump), stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase));
}
void resetPutByID(CodeBlock* codeBlock, StructureStubInfo& stubInfo)
{
V_JITOperation_ESsiJJI unoptimizedFunction = bitwise_cast<V_JITOperation_ESsiJJI>(readCallTarget(codeBlock, stubInfo.callReturnLocation).executableAddress());
V_JITOperation_ESsiJJI optimizedFunction;
if (unoptimizedFunction == operationPutByIdStrict || unoptimizedFunction == operationPutByIdStrictOptimize)
optimizedFunction = operationPutByIdStrictOptimize;
else if (unoptimizedFunction == operationPutByIdNonStrict || unoptimizedFunction == operationPutByIdNonStrictOptimize)
optimizedFunction = operationPutByIdNonStrictOptimize;
else if (unoptimizedFunction == operationPutByIdDirectStrict || unoptimizedFunction == operationPutByIdDirectStrictOptimize)
optimizedFunction = operationPutByIdDirectStrictOptimize;
else {
ASSERT(unoptimizedFunction == operationPutByIdDirectNonStrict || unoptimizedFunction == operationPutByIdDirectNonStrictOptimize);
optimizedFunction = operationPutByIdDirectNonStrictOptimize;
}
repatchCall(codeBlock, stubInfo.callReturnLocation, optimizedFunction);
resetPutByIDCheckAndLoad(stubInfo);
MacroAssembler::repatchJump(stubInfo.callReturnLocation.jumpAtOffset(stubInfo.patch.deltaCallToJump), stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase));
}
void resetIn(CodeBlock*, StructureStubInfo& stubInfo)
{
MacroAssembler::repatchJump(stubInfo.callReturnLocation.jumpAtOffset(stubInfo.patch.deltaCallToJump), stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase));
}
} // namespace JSC
#endif