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JITOperations.cpp
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1864 lines (1536 loc) · 72 KB
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/*
* Copyright (C) 2013 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"
#if ENABLE(JIT)
#include "JITOperations.h"
#include "Arguments.h"
#include "ArrayConstructor.h"
#include "CallFrameInlines.h"
#include "CommonSlowPaths.h"
#include "DFGCompilationMode.h"
#include "DFGDriver.h"
#include "DFGOSREntry.h"
#include "DFGWorklist.h"
#include "Error.h"
#include "GetterSetter.h"
#include "HostCallReturnValue.h"
#include "JIT.h"
#include "JITOperationWrappers.h"
#include "JITToDFGDeferredCompilationCallback.h"
#include "JSGlobalObjectFunctions.h"
#include "JSNameScope.h"
#include "JSPropertyNameIterator.h"
#include "JSStackInlines.h"
#include "JSWithScope.h"
#include "ObjectConstructor.h"
#include "Operations.h"
#include "Repatch.h"
#include "RepatchBuffer.h"
namespace JSC {
extern "C" {
#if COMPILER(MSVC)
void * _ReturnAddress(void);
#pragma intrinsic(_ReturnAddress)
#define OUR_RETURN_ADDRESS _ReturnAddress()
#else
#define OUR_RETURN_ADDRESS __builtin_return_address(0)
#endif
#if ENABLE(OPCODE_SAMPLING)
#define CTI_SAMPLER vm->interpreter->sampler()
#else
#define CTI_SAMPLER 0
#endif
void JIT_OPERATION operationStackCheck(ExecState* exec, CodeBlock* codeBlock)
{
// We pass in our own code block, because the callframe hasn't been populated.
VM* vm = codeBlock->vm();
CallFrame* callerFrame = exec->callerFrameSkippingVMEntrySentinel();
if (!callerFrame)
callerFrame = exec;
NativeCallFrameTracer tracer(vm, callerFrame);
JSStack& stack = vm->interpreter->stack();
if (UNLIKELY(!stack.grow(&exec->registers()[virtualRegisterForLocal(codeBlock->frameRegisterCount()).offset()])))
vm->throwException(callerFrame, createStackOverflowError(callerFrame));
}
int32_t JIT_OPERATION operationCallArityCheck(ExecState* exec)
{
VM* vm = &exec->vm();
CallFrame* callerFrame = exec->callerFrameSkippingVMEntrySentinel();
NativeCallFrameTracer tracer(vm, callerFrame);
JSStack& stack = vm->interpreter->stack();
int32_t missingArgCount = CommonSlowPaths::arityCheckFor(exec, &stack, CodeForCall);
if (missingArgCount < 0)
vm->throwException(callerFrame, createStackOverflowError(callerFrame));
return missingArgCount;
}
int32_t JIT_OPERATION operationConstructArityCheck(ExecState* exec)
{
VM* vm = &exec->vm();
CallFrame* callerFrame = exec->callerFrameSkippingVMEntrySentinel();
NativeCallFrameTracer tracer(vm, callerFrame);
JSStack& stack = vm->interpreter->stack();
int32_t missingArgCount = CommonSlowPaths::arityCheckFor(exec, &stack, CodeForConstruct);
if (missingArgCount < 0)
vm->throwException(callerFrame, createStackOverflowError(callerFrame));
return missingArgCount;
}
EncodedJSValue JIT_OPERATION operationGetById(ExecState* exec, StructureStubInfo*, EncodedJSValue base, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue);
Identifier ident(vm, uid);
return JSValue::encode(baseValue.get(exec, ident, slot));
}
EncodedJSValue JIT_OPERATION operationGetByIdBuildList(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue base, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue);
JSValue result = baseValue.get(exec, ident, slot);
if (accessType == static_cast<AccessType>(stubInfo->accessType))
buildGetByIDList(exec, baseValue, ident, slot, *stubInfo);
return JSValue::encode(result);
}
EncodedJSValue JIT_OPERATION operationGetByIdOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue base, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident = uid->isEmptyUnique() ? Identifier::from(PrivateName(uid)) : Identifier(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue);
JSValue result = baseValue.get(exec, ident, slot);
if (accessType == static_cast<AccessType>(stubInfo->accessType)) {
if (stubInfo->seen)
repatchGetByID(exec, baseValue, ident, slot, *stubInfo);
else
stubInfo->seen = true;
}
return JSValue::encode(result);
}
EncodedJSValue JIT_OPERATION operationInOptimize(ExecState* exec, StructureStubInfo* stubInfo, JSCell* base, StringImpl* key)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
if (!base->isObject()) {
vm->throwException(exec, createInvalidParameterError(exec, "in", base));
return JSValue::encode(jsUndefined());
}
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
Identifier ident(vm, key);
PropertySlot slot(base);
bool result = asObject(base)->getPropertySlot(exec, ident, slot);
RELEASE_ASSERT(accessType == stubInfo->accessType);
if (stubInfo->seen)
repatchIn(exec, base, ident, result, slot, *stubInfo);
else
stubInfo->seen = true;
return JSValue::encode(jsBoolean(result));
}
EncodedJSValue JIT_OPERATION operationIn(ExecState* exec, StructureStubInfo*, JSCell* base, StringImpl* key)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
if (!base->isObject()) {
vm->throwException(exec, createInvalidParameterError(exec, "in", base));
return JSValue::encode(jsUndefined());
}
Identifier ident(vm, key);
return JSValue::encode(jsBoolean(asObject(base)->hasProperty(exec, ident)));
}
EncodedJSValue JIT_OPERATION operationGenericIn(ExecState* exec, JSCell* base, EncodedJSValue key)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::encode(jsBoolean(CommonSlowPaths::opIn(exec, JSValue::decode(key), base)));
}
EncodedJSValue JIT_OPERATION operationCallCustomGetter(ExecState* exec, JSCell* base, PropertySlot::GetValueFunc function, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
return function(exec, JSValue::encode(base), JSValue::encode(base), ident);
}
EncodedJSValue JIT_OPERATION operationCallGetter(ExecState* exec, JSCell* base, JSCell* getterSetter)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::encode(callGetter(exec, base, getterSetter));
}
void JIT_OPERATION operationPutByIdStrict(ExecState* exec, StructureStubInfo*, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), true, exec->codeBlock()->putByIdContext());
JSValue::decode(encodedBase).put(exec, ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdNonStrict(ExecState* exec, StructureStubInfo*, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), false, exec->codeBlock()->putByIdContext());
JSValue::decode(encodedBase).put(exec, ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdDirectStrict(ExecState* exec, StructureStubInfo*, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), true, exec->codeBlock()->putByIdContext());
asObject(JSValue::decode(encodedBase))->putDirect(exec->vm(), ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdDirectNonStrict(ExecState* exec, StructureStubInfo*, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), false, exec->codeBlock()->putByIdContext());
asObject(JSValue::decode(encodedBase))->putDirect(exec->vm(), ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSValue baseValue = JSValue::decode(encodedBase);
PutPropertySlot slot(baseValue, true, exec->codeBlock()->putByIdContext());
baseValue.put(exec, ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseValue, ident, slot, *stubInfo, NotDirect);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationPutByIdNonStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSValue baseValue = JSValue::decode(encodedBase);
PutPropertySlot slot(baseValue, false, exec->codeBlock()->putByIdContext());
baseValue.put(exec, ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseValue, ident, slot, *stubInfo, NotDirect);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationPutByIdDirectStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSObject* baseObject = asObject(JSValue::decode(encodedBase));
PutPropertySlot slot(baseObject, true, exec->codeBlock()->putByIdContext());
baseObject->putDirect(exec->vm(), ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseObject, ident, slot, *stubInfo, Direct);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationPutByIdDirectNonStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSObject* baseObject = asObject(JSValue::decode(encodedBase));
PutPropertySlot slot(baseObject, false, exec->codeBlock()->putByIdContext());
baseObject->putDirect(exec->vm(), ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseObject, ident, slot, *stubInfo, Direct);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationPutByIdStrictBuildList(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSValue baseValue = JSValue::decode(encodedBase);
PutPropertySlot slot(baseValue, true, exec->codeBlock()->putByIdContext());
baseValue.put(exec, ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
buildPutByIdList(exec, baseValue, ident, slot, *stubInfo, NotDirect);
}
void JIT_OPERATION operationPutByIdNonStrictBuildList(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSValue baseValue = JSValue::decode(encodedBase);
PutPropertySlot slot(baseValue, false, exec->codeBlock()->putByIdContext());
baseValue.put(exec, ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
buildPutByIdList(exec, baseValue, ident, slot, *stubInfo, NotDirect);
}
void JIT_OPERATION operationPutByIdDirectStrictBuildList(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSObject* baseObject = asObject(JSValue::decode(encodedBase));
PutPropertySlot slot(baseObject, true, exec->codeBlock()->putByIdContext());
baseObject->putDirect(exec->vm(), ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
buildPutByIdList(exec, baseObject, ident, slot, *stubInfo, Direct);
}
void JIT_OPERATION operationPutByIdDirectNonStrictBuildList(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, StringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSObject* baseObject = asObject(JSValue::decode(encodedBase));
PutPropertySlot slot(baseObject, false, exec->codeBlock()->putByIdContext());
baseObject ->putDirect(exec->vm(), ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
buildPutByIdList(exec, baseObject, ident, slot, *stubInfo, Direct);
}
void JIT_OPERATION operationReallocateStorageAndFinishPut(ExecState* exec, JSObject* base, Structure* structure, PropertyOffset offset, EncodedJSValue value)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
ASSERT(structure->outOfLineCapacity() > base->structure()->outOfLineCapacity());
ASSERT(!vm.heap.storageAllocator().fastPathShouldSucceed(structure->outOfLineCapacity() * sizeof(JSValue)));
base->setStructureAndReallocateStorageIfNecessary(vm, structure);
base->putDirect(vm, offset, JSValue::decode(value));
}
static void putByVal(CallFrame* callFrame, JSValue baseValue, JSValue subscript, JSValue value)
{
if (LIKELY(subscript.isUInt32())) {
uint32_t i = subscript.asUInt32();
if (baseValue.isObject()) {
JSObject* object = asObject(baseValue);
if (object->canSetIndexQuickly(i))
object->setIndexQuickly(callFrame->vm(), i, value);
else
object->methodTable()->putByIndex(object, callFrame, i, value, callFrame->codeBlock()->isStrictMode());
} else
baseValue.putByIndex(callFrame, i, value, callFrame->codeBlock()->isStrictMode());
} else if (isName(subscript)) {
PutPropertySlot slot(baseValue, callFrame->codeBlock()->isStrictMode());
baseValue.put(callFrame, jsCast<NameInstance*>(subscript.asCell())->privateName(), value, slot);
} else {
Identifier property(callFrame, subscript.toString(callFrame)->value(callFrame));
if (!callFrame->vm().exception()) { // Don't put to an object if toString threw an exception.
PutPropertySlot slot(baseValue, callFrame->codeBlock()->isStrictMode());
baseValue.put(callFrame, property, value, slot);
}
}
}
static void directPutByVal(CallFrame* callFrame, JSObject* baseObject, JSValue subscript, JSValue value)
{
if (LIKELY(subscript.isUInt32())) {
uint32_t i = subscript.asUInt32();
baseObject->putDirectIndex(callFrame, i, value);
} else if (isName(subscript)) {
PutPropertySlot slot(baseObject, callFrame->codeBlock()->isStrictMode());
baseObject->putDirect(callFrame->vm(), jsCast<NameInstance*>(subscript.asCell())->privateName(), value, slot);
} else {
Identifier property(callFrame, subscript.toString(callFrame)->value(callFrame));
if (!callFrame->vm().exception()) { // Don't put to an object if toString threw an exception.
PutPropertySlot slot(baseObject, callFrame->codeBlock()->isStrictMode());
baseObject->putDirect(callFrame->vm(), property, value, slot);
}
}
}
void JIT_OPERATION operationPutByVal(ExecState* exec, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
if (baseValue.isObject() && subscript.isInt32()) {
// See if it's worth optimizing at all.
JSObject* object = asObject(baseValue);
bool didOptimize = false;
unsigned bytecodeOffset = exec->locationAsBytecodeOffset();
ASSERT(bytecodeOffset);
ByValInfo& byValInfo = exec->codeBlock()->getByValInfo(bytecodeOffset - 1);
ASSERT(!byValInfo.stubRoutine);
if (hasOptimizableIndexing(object->structure())) {
// Attempt to optimize.
JITArrayMode arrayMode = jitArrayModeForStructure(object->structure());
if (arrayMode != byValInfo.arrayMode) {
JIT::compilePutByVal(&vm, exec->codeBlock(), &byValInfo, ReturnAddressPtr(OUR_RETURN_ADDRESS), arrayMode);
didOptimize = true;
}
}
if (!didOptimize) {
// If we take slow path more than 10 times without patching then make sure we
// never make that mistake again. Or, if we failed to patch and we have some object
// that intercepts indexed get, then don't even wait until 10 times. For cases
// where we see non-index-intercepting objects, this gives 10 iterations worth of
// opportunity for us to observe that the get_by_val may be polymorphic.
if (++byValInfo.slowPathCount >= 10
|| object->structure()->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero()) {
// Don't ever try to optimize.
RepatchBuffer repatchBuffer(exec->codeBlock());
repatchBuffer.relinkCallerToFunction(ReturnAddressPtr(OUR_RETURN_ADDRESS), FunctionPtr(operationPutByValGeneric));
}
}
}
putByVal(exec, baseValue, subscript, value);
}
void JIT_OPERATION operationDirectPutByVal(ExecState* callFrame, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue)
{
VM& vm = callFrame->vm();
NativeCallFrameTracer tracer(&vm, callFrame);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
RELEASE_ASSERT(baseValue.isObject());
JSObject* object = asObject(baseValue);
if (subscript.isInt32()) {
// See if it's worth optimizing at all.
bool didOptimize = false;
unsigned bytecodeOffset = callFrame->locationAsBytecodeOffset();
ASSERT(bytecodeOffset);
ByValInfo& byValInfo = callFrame->codeBlock()->getByValInfo(bytecodeOffset - 1);
ASSERT(!byValInfo.stubRoutine);
if (hasOptimizableIndexing(object->structure())) {
// Attempt to optimize.
JITArrayMode arrayMode = jitArrayModeForStructure(object->structure());
if (arrayMode != byValInfo.arrayMode) {
JIT::compileDirectPutByVal(&vm, callFrame->codeBlock(), &byValInfo, ReturnAddressPtr(OUR_RETURN_ADDRESS), arrayMode);
didOptimize = true;
}
}
if (!didOptimize) {
// If we take slow path more than 10 times without patching then make sure we
// never make that mistake again. Or, if we failed to patch and we have some object
// that intercepts indexed get, then don't even wait until 10 times. For cases
// where we see non-index-intercepting objects, this gives 10 iterations worth of
// opportunity for us to observe that the get_by_val may be polymorphic.
if (++byValInfo.slowPathCount >= 10
|| object->structure()->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero()) {
// Don't ever try to optimize.
RepatchBuffer repatchBuffer(callFrame->codeBlock());
repatchBuffer.relinkCallerToFunction(ReturnAddressPtr(OUR_RETURN_ADDRESS), FunctionPtr(operationDirectPutByValGeneric));
}
}
}
directPutByVal(callFrame, object, subscript, value);
}
void JIT_OPERATION operationPutByValGeneric(ExecState* exec, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
putByVal(exec, baseValue, subscript, value);
}
void JIT_OPERATION operationDirectPutByValGeneric(ExecState* exec, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
RELEASE_ASSERT(baseValue.isObject());
directPutByVal(exec, asObject(baseValue), subscript, value);
}
EncodedJSValue JIT_OPERATION operationCallEval(ExecState* execCallee)
{
CallFrame* callerFrame = execCallee->callerFrame();
ASSERT(execCallee->callerFrame()->codeBlock()->codeType() != FunctionCode
|| !execCallee->callerFrame()->codeBlock()->needsFullScopeChain()
|| execCallee->callerFrame()->uncheckedR(execCallee->callerFrame()->codeBlock()->activationRegister().offset()).jsValue());
execCallee->setScope(callerFrame->scope());
execCallee->setReturnPC(static_cast<Instruction*>(OUR_RETURN_ADDRESS));
execCallee->setCodeBlock(0);
if (!isHostFunction(execCallee->calleeAsValue(), globalFuncEval))
return JSValue::encode(JSValue());
VM* vm = &execCallee->vm();
JSValue result = eval(execCallee);
if (vm->exception())
return EncodedJSValue();
return JSValue::encode(result);
}
static void* handleHostCall(ExecState* execCallee, JSValue callee, CodeSpecializationKind kind)
{
ExecState* exec = execCallee->callerFrame();
VM* vm = &exec->vm();
execCallee->setScope(exec->scope());
execCallee->setCodeBlock(0);
if (kind == CodeForCall) {
CallData callData;
CallType callType = getCallData(callee, callData);
ASSERT(callType != CallTypeJS);
if (callType == CallTypeHost) {
NativeCallFrameTracer tracer(vm, execCallee);
execCallee->setCallee(asObject(callee));
vm->hostCallReturnValue = JSValue::decode(callData.native.function(execCallee));
if (vm->exception())
return vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress();
return reinterpret_cast<void*>(getHostCallReturnValue);
}
ASSERT(callType == CallTypeNone);
exec->vm().throwException(exec, createNotAFunctionError(exec, callee));
return vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress();
}
ASSERT(kind == CodeForConstruct);
ConstructData constructData;
ConstructType constructType = getConstructData(callee, constructData);
ASSERT(constructType != ConstructTypeJS);
if (constructType == ConstructTypeHost) {
NativeCallFrameTracer tracer(vm, execCallee);
execCallee->setCallee(asObject(callee));
vm->hostCallReturnValue = JSValue::decode(constructData.native.function(execCallee));
if (vm->exception())
return vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress();
return reinterpret_cast<void*>(getHostCallReturnValue);
}
ASSERT(constructType == ConstructTypeNone);
exec->vm().throwException(exec, createNotAConstructorError(exec, callee));
return vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress();
}
inline char* linkFor(ExecState* execCallee, CodeSpecializationKind kind)
{
ExecState* exec = execCallee->callerFrame();
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
JSValue calleeAsValue = execCallee->calleeAsValue();
JSCell* calleeAsFunctionCell = getJSFunction(calleeAsValue);
if (!calleeAsFunctionCell)
return reinterpret_cast<char*>(handleHostCall(execCallee, calleeAsValue, kind));
JSFunction* callee = jsCast<JSFunction*>(calleeAsFunctionCell);
execCallee->setScope(callee->scopeUnchecked());
ExecutableBase* executable = callee->executable();
MacroAssemblerCodePtr codePtr;
CodeBlock* codeBlock = 0;
CallLinkInfo& callLinkInfo = exec->codeBlock()->getCallLinkInfo(execCallee->returnPC());
if (executable->isHostFunction())
codePtr = executable->generatedJITCodeFor(kind)->addressForCall();
else {
FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
JSObject* error = functionExecutable->prepareForExecution(execCallee, callee->scope(), kind);
if (error) {
vm->throwException(exec, createStackOverflowError(exec));
return reinterpret_cast<char*>(vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress());
}
codeBlock = functionExecutable->codeBlockFor(kind);
if (execCallee->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()) || callLinkInfo.callType == CallLinkInfo::CallVarargs)
codePtr = functionExecutable->generatedJITCodeWithArityCheckFor(kind);
else
codePtr = functionExecutable->generatedJITCodeFor(kind)->addressForCall();
}
if (!callLinkInfo.seenOnce())
callLinkInfo.setSeen();
else
linkFor(execCallee, callLinkInfo, codeBlock, callee, codePtr, kind);
return reinterpret_cast<char*>(codePtr.executableAddress());
}
char* JIT_OPERATION operationLinkCall(ExecState* execCallee)
{
return linkFor(execCallee, CodeForCall);
}
char* JIT_OPERATION operationLinkConstruct(ExecState* execCallee)
{
return linkFor(execCallee, CodeForConstruct);
}
inline char* virtualForWithFunction(ExecState* execCallee, CodeSpecializationKind kind, JSCell*& calleeAsFunctionCell)
{
ExecState* exec = execCallee->callerFrame();
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
JSValue calleeAsValue = execCallee->calleeAsValue();
calleeAsFunctionCell = getJSFunction(calleeAsValue);
if (UNLIKELY(!calleeAsFunctionCell))
return reinterpret_cast<char*>(handleHostCall(execCallee, calleeAsValue, kind));
JSFunction* function = jsCast<JSFunction*>(calleeAsFunctionCell);
execCallee->setScope(function->scopeUnchecked());
ExecutableBase* executable = function->executable();
if (UNLIKELY(!executable->hasJITCodeFor(kind))) {
FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
JSObject* error = functionExecutable->prepareForExecution(execCallee, function->scope(), kind);
if (error) {
exec->vm().throwException(execCallee, error);
return reinterpret_cast<char*>(vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress());
}
}
return reinterpret_cast<char*>(executable->generatedJITCodeWithArityCheckFor(kind).executableAddress());
}
inline char* virtualFor(ExecState* execCallee, CodeSpecializationKind kind)
{
JSCell* calleeAsFunctionCellIgnored;
return virtualForWithFunction(execCallee, kind, calleeAsFunctionCellIgnored);
}
static bool attemptToOptimizeClosureCall(ExecState* execCallee, JSCell* calleeAsFunctionCell, CallLinkInfo& callLinkInfo)
{
if (!calleeAsFunctionCell)
return false;
JSFunction* callee = jsCast<JSFunction*>(calleeAsFunctionCell);
JSFunction* oldCallee = callLinkInfo.callee.get();
if (!oldCallee
|| oldCallee->structure() != callee->structure()
|| oldCallee->executable() != callee->executable())
return false;
ASSERT(callee->executable()->hasJITCodeForCall());
MacroAssemblerCodePtr codePtr = callee->executable()->generatedJITCodeForCall()->addressForCall();
CodeBlock* codeBlock;
if (callee->executable()->isHostFunction())
codeBlock = 0;
else {
codeBlock = jsCast<FunctionExecutable*>(callee->executable())->codeBlockForCall();
if (execCallee->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()))
return false;
}
linkClosureCall(
execCallee, callLinkInfo, codeBlock,
callee->structure(), callee->executable(), codePtr);
return true;
}
char* JIT_OPERATION operationLinkClosureCall(ExecState* execCallee)
{
JSCell* calleeAsFunctionCell;
char* result = virtualForWithFunction(execCallee, CodeForCall, calleeAsFunctionCell);
CallLinkInfo& callLinkInfo = execCallee->callerFrame()->codeBlock()->getCallLinkInfo(execCallee->returnPC());
if (!attemptToOptimizeClosureCall(execCallee, calleeAsFunctionCell, callLinkInfo))
linkSlowFor(execCallee, callLinkInfo, CodeForCall);
return result;
}
char* JIT_OPERATION operationVirtualCall(ExecState* execCallee)
{
return virtualFor(execCallee, CodeForCall);
}
char* JIT_OPERATION operationVirtualConstruct(ExecState* execCallee)
{
return virtualFor(execCallee, CodeForConstruct);
}
size_t JIT_OPERATION operationCompareLess(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLess<true>(exec, JSValue::decode(encodedOp1), JSValue::decode(encodedOp2));
}
size_t JIT_OPERATION operationCompareLessEq(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLessEq<true>(exec, JSValue::decode(encodedOp1), JSValue::decode(encodedOp2));
}
size_t JIT_OPERATION operationCompareGreater(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLess<false>(exec, JSValue::decode(encodedOp2), JSValue::decode(encodedOp1));
}
size_t JIT_OPERATION operationCompareGreaterEq(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLessEq<false>(exec, JSValue::decode(encodedOp2), JSValue::decode(encodedOp1));
}
size_t JIT_OPERATION operationConvertJSValueToBoolean(ExecState* exec, EncodedJSValue encodedOp)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::decode(encodedOp).toBoolean(exec);
}
size_t JIT_OPERATION operationCompareEq(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::equalSlowCaseInline(exec, JSValue::decode(encodedOp1), JSValue::decode(encodedOp2));
}
#if USE(JSVALUE64)
EncodedJSValue JIT_OPERATION operationCompareStringEq(ExecState* exec, JSCell* left, JSCell* right)
#else
size_t JIT_OPERATION operationCompareStringEq(ExecState* exec, JSCell* left, JSCell* right)
#endif
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
bool result = asString(left)->value(exec) == asString(right)->value(exec);
#if USE(JSVALUE64)
return JSValue::encode(jsBoolean(result));
#else
return result;
#endif
}
size_t JIT_OPERATION operationHasProperty(ExecState* exec, JSObject* base, JSString* property)
{
int result = base->hasProperty(exec, Identifier(exec, property->value(exec)));
return result;
}
EncodedJSValue JIT_OPERATION operationNewArrayWithProfile(ExecState* exec, ArrayAllocationProfile* profile, const JSValue* values, int size)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::encode(constructArrayNegativeIndexed(exec, profile, values, size));
}
EncodedJSValue JIT_OPERATION operationNewArrayBufferWithProfile(ExecState* exec, ArrayAllocationProfile* profile, const JSValue* values, int size)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::encode(constructArray(exec, profile, values, size));
}
EncodedJSValue JIT_OPERATION operationNewArrayWithSizeAndProfile(ExecState* exec, ArrayAllocationProfile* profile, EncodedJSValue size)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
JSValue sizeValue = JSValue::decode(size);
return JSValue::encode(constructArrayWithSizeQuirk(exec, profile, exec->lexicalGlobalObject(), sizeValue));
}
EncodedJSValue JIT_OPERATION operationNewFunction(ExecState* exec, JSCell* functionExecutable)
{
ASSERT(functionExecutable->inherits(FunctionExecutable::info()));
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
return JSValue::encode(JSFunction::create(vm, static_cast<FunctionExecutable*>(functionExecutable), exec->scope()));
}
JSCell* JIT_OPERATION operationNewObject(ExecState* exec, Structure* structure)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return constructEmptyObject(exec, structure);
}
EncodedJSValue JIT_OPERATION operationNewRegexp(ExecState* exec, void* regexpPtr)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
RegExp* regexp = static_cast<RegExp*>(regexpPtr);
if (!regexp->isValid()) {
vm.throwException(exec, createSyntaxError(exec, "Invalid flags supplied to RegExp constructor."));
return JSValue::encode(jsUndefined());
}
return JSValue::encode(RegExpObject::create(vm, exec->lexicalGlobalObject()->regExpStructure(), regexp));
}
void JIT_OPERATION operationHandleWatchdogTimer(ExecState* exec)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
if (UNLIKELY(vm.watchdog.didFire(exec)))
vm.throwException(exec, createTerminatedExecutionException(&vm));
}
void JIT_OPERATION operationThrowStaticError(ExecState* exec, EncodedJSValue encodedValue, int32_t referenceErrorFlag)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
String message = errorDescriptionForValue(exec, JSValue::decode(encodedValue))->value(exec);
if (referenceErrorFlag)
vm.throwException(exec, createReferenceError(exec, message));
else
vm.throwException(exec, createTypeError(exec, message));
}
void JIT_OPERATION operationDebug(ExecState* exec, int32_t debugHookID)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
vm.interpreter->debug(exec, static_cast<DebugHookID>(debugHookID));
}
#if ENABLE(DFG_JIT)
char* JIT_OPERATION operationOptimize(ExecState* exec, int32_t bytecodeIndex)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
// Defer GC so that it doesn't run between when we enter into this slow path and
// when we figure out the state of our code block. This prevents a number of
// awkward reentrancy scenarios, including:
//
// - The optimized version of our code block being jettisoned by GC right after
// we concluded that we wanted to use it.
//
// - An optimized version of our code block being installed just as we decided
// that it wasn't ready yet.
//
// This still leaves the following: anytime we return from cti_optimize, we may
// GC, and the GC may either jettison the optimized version of our code block,
// or it may install the optimized version of our code block even though we
// concluded that it wasn't ready yet.
//
// Note that jettisoning won't happen if we already initiated OSR, because in
// that case we would have already planted the optimized code block into the JS
// stack.
DeferGC deferGC(vm.heap);