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JITStubs.cpp
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executable file
·2266 lines (1843 loc) · 85.6 KB
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/*
* Copyright (C) 2008, 2009, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2008 Cameron Zwarich <[email protected]>
* Copyright (C) Research In Motion Limited 2010, 2011. 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(JIT)
#include "JITStubs.h"
#include "Arguments.h"
#include "ArrayConstructor.h"
#include "CallFrame.h"
#include "CallFrameInlines.h"
#include "CodeBlock.h"
#include "CodeProfiling.h"
#include "CommonSlowPaths.h"
#include "DFGOSREntry.h"
#include "DFGWorklist.h"
#include "Debugger.h"
#include "DeferGC.h"
#include "ErrorInstance.h"
#include "ExceptionHelpers.h"
#include "GetterSetter.h"
#include "Heap.h"
#include <wtf/InlineASM.h>
#include "JIT.h"
#include "JITExceptions.h"
#include "JITToDFGDeferredCompilationCallback.h"
#include "JSActivation.h"
#include "JSArray.h"
#include "JSFunction.h"
#include "JSGlobalObjectFunctions.h"
#include "JSNameScope.h"
#include "JSNotAnObject.h"
#include "JSPropertyNameIterator.h"
#include "JSString.h"
#include "JSWithScope.h"
#include "LegacyProfiler.h"
#include "NameInstance.h"
#include "ObjectConstructor.h"
#include "ObjectPrototype.h"
#include "Operations.h"
#include "Parser.h"
#include "RegExpObject.h"
#include "RegExpPrototype.h"
#include "Register.h"
#include "RepatchBuffer.h"
#include "SamplingTool.h"
#include "SlowPathCall.h"
#include "Strong.h"
#include "StructureRareDataInlines.h"
#include <wtf/StdLibExtras.h>
#include <stdarg.h>
#include <stdio.h>
using namespace std;
#if CPU(ARM_TRADITIONAL)
#include "JITStubsARM.h"
#elif CPU(ARM_THUMB2)
#include "JITStubsARMv7.h"
#elif CPU(MIPS)
#include "JITStubsMIPS.h"
#elif CPU(SH4)
#include "JITStubsSH4.h"
#elif CPU(X86)
#include "JITStubsX86.h"
#elif CPU(X86_64)
#include "JITStubsX86_64.h"
#else
#error "JIT not supported on this platform."
#endif
namespace JSC {
#if ENABLE(OPCODE_SAMPLING)
#define CTI_SAMPLER stackFrame.vm->interpreter->sampler()
#else
#define CTI_SAMPLER 0
#endif
void performPlatformSpecificJITAssertions(VM* vm)
{
if (!vm->canUseJIT())
return;
#if CPU(ARM_THUMB2)
performARMv7JITAssertions();
#elif CPU(ARM_TRADITIONAL)
performARMJITAssertions();
#elif CPU(MIPS)
performMIPSJITAssertions();
#elif CPU(SH4)
performSH4JITAssertions();
#endif
}
NEVER_INLINE static void tryCachePutByID(CallFrame* callFrame, CodeBlock* codeBlock, ReturnAddressPtr returnAddress, JSValue baseValue, const PutPropertySlot& slot, StructureStubInfo* stubInfo, bool direct)
{
ConcurrentJITLocker locker(codeBlock->m_lock);
// The interpreter checks for recursion here; I do not believe this can occur in CTI.
if (!baseValue.isCell())
return;
// Uncacheable: give up.
if (!slot.isCacheable()) {
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic));
return;
}
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure();
if (structure->isUncacheableDictionary() || structure->typeInfo().prohibitsPropertyCaching()) {
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic));
return;
}
// If baseCell != base, then baseCell must be a proxy for another object.
if (baseCell != slot.base()) {
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic));
return;
}
// Cache hit: Specialize instruction and ref Structures.
// Structure transition, cache transition info
if (slot.type() == PutPropertySlot::NewProperty) {
if (structure->isDictionary()) {
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic));
return;
}
// put_by_id_transition checks the prototype chain for setters.
if (normalizePrototypeChain(callFrame, baseCell) == InvalidPrototypeChain) {
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic));
return;
}
StructureChain* prototypeChain = structure->prototypeChain(callFrame);
ASSERT(structure->previousID()->transitionWatchpointSetHasBeenInvalidated());
stubInfo->initPutByIdTransition(callFrame->vm(), codeBlock->ownerExecutable(), structure->previousID(), structure, prototypeChain, direct);
JIT::compilePutByIdTransition(callFrame->scope()->vm(), codeBlock, stubInfo, structure->previousID(), structure, slot.cachedOffset(), prototypeChain, returnAddress, direct);
return;
}
stubInfo->initPutByIdReplace(callFrame->vm(), codeBlock->ownerExecutable(), structure);
JIT::patchPutByIdReplace(codeBlock, stubInfo, structure, slot.cachedOffset(), returnAddress, direct);
}
NEVER_INLINE static void tryCacheGetByID(CallFrame* callFrame, CodeBlock* codeBlock, ReturnAddressPtr returnAddress, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo* stubInfo)
{
ConcurrentJITLocker locker(codeBlock->m_lock);
// FIXME: Write a test that proves we need to check for recursion here just
// like the interpreter does, then add a check for recursion.
// FIXME: Cache property access for immediates.
if (!baseValue.isCell()) {
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(cti_op_get_by_id_generic));
return;
}
VM* vm = &callFrame->vm();
if (isJSArray(baseValue) && propertyName == callFrame->propertyNames().length) {
JIT::compilePatchGetArrayLength(callFrame->scope()->vm(), codeBlock, returnAddress);
return;
}
if (isJSString(baseValue) && propertyName == callFrame->propertyNames().length) {
// The tradeoff of compiling an patched inline string length access routine does not seem
// to pay off, so we currently only do this for arrays.
ctiPatchCallByReturnAddress(codeBlock, returnAddress, vm->getCTIStub(stringLengthTrampolineGenerator).code());
return;
}
// Uncacheable: give up.
if (!slot.isCacheable()) {
stubInfo->accessType = access_get_by_id_generic;
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(cti_op_get_by_id_generic));
return;
}
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure();
if (structure->isUncacheableDictionary() || structure->typeInfo().prohibitsPropertyCaching()) {
stubInfo->accessType = access_get_by_id_generic;
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(cti_op_get_by_id_generic));
return;
}
// Cache hit: Specialize instruction and ref Structures.
if (slot.slotBase() == baseValue) {
RELEASE_ASSERT(stubInfo->accessType == access_unset);
if (!slot.isCacheableValue() || !MacroAssembler::isCompactPtrAlignedAddressOffset(maxOffsetRelativeToPatchedStorage(slot.cachedOffset())))
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(cti_op_get_by_id_self_fail));
else {
JIT::patchGetByIdSelf(codeBlock, stubInfo, structure, slot.cachedOffset(), returnAddress);
stubInfo->initGetByIdSelf(callFrame->vm(), codeBlock->ownerExecutable(), structure);
}
return;
}
if (structure->isDictionary()) {
stubInfo->accessType = access_get_by_id_generic;
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(cti_op_get_by_id_generic));
return;
}
if (slot.slotBase() == structure->prototypeForLookup(callFrame)) {
JSObject* slotBaseObject = asObject(slot.slotBase());
size_t offset = slot.cachedOffset();
if (structure->typeInfo().hasImpureGetOwnPropertySlot()) {
stubInfo->accessType = access_get_by_id_generic;
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(cti_op_get_by_id_generic));
return;
}
// Since we're accessing a prototype in a loop, it's a good bet that it
// should not be treated as a dictionary.
if (slotBaseObject->structure()->isDictionary()) {
slotBaseObject->flattenDictionaryObject(callFrame->vm());
offset = slotBaseObject->structure()->get(callFrame->vm(), propertyName);
}
stubInfo->initGetByIdProto(callFrame->vm(), codeBlock->ownerExecutable(), structure, slotBaseObject->structure(), slot.isCacheableValue());
ASSERT(!structure->isDictionary());
ASSERT(!slotBaseObject->structure()->isDictionary());
JIT::compileGetByIdProto(callFrame->scope()->vm(), callFrame, codeBlock, stubInfo, structure, slotBaseObject->structure(), propertyName, slot, offset, returnAddress);
return;
}
PropertyOffset offset = slot.cachedOffset();
size_t count = normalizePrototypeChainForChainAccess(callFrame, baseValue, slot.slotBase(), propertyName, offset);
if (count == InvalidPrototypeChain) {
stubInfo->accessType = access_get_by_id_generic;
ctiPatchCallByReturnAddress(codeBlock, returnAddress, FunctionPtr(cti_op_get_by_id_generic));
return;
}
StructureChain* prototypeChain = structure->prototypeChain(callFrame);
stubInfo->initGetByIdChain(callFrame->vm(), codeBlock->ownerExecutable(), structure, prototypeChain, count, slot.isCacheableValue());
JIT::compileGetByIdChain(callFrame->scope()->vm(), callFrame, codeBlock, stubInfo, structure, prototypeChain, count, propertyName, slot, offset, returnAddress);
}
#if !defined(NDEBUG)
extern "C" {
static void jscGeneratedNativeCode()
{
// When executing a JIT stub function (which might do an allocation), we hack the return address
// to pretend to be executing this function, to keep stack logging tools from blowing out
// memory.
}
}
struct StackHack {
ALWAYS_INLINE StackHack(JITStackFrame& stackFrame)
: stackFrame(stackFrame)
, savedReturnAddress(*stackFrame.returnAddressSlot())
{
if (!CodeProfiling::enabled())
*stackFrame.returnAddressSlot() = ReturnAddressPtr(FunctionPtr(jscGeneratedNativeCode));
}
ALWAYS_INLINE ~StackHack()
{
*stackFrame.returnAddressSlot() = savedReturnAddress;
}
JITStackFrame& stackFrame;
ReturnAddressPtr savedReturnAddress;
};
#define STUB_INIT_STACK_FRAME(stackFrame) JITStackFrame& stackFrame = *reinterpret_cast_ptr<JITStackFrame*>(STUB_ARGS); StackHack stackHack(stackFrame)
#define STUB_SET_RETURN_ADDRESS(returnAddress) stackHack.savedReturnAddress = ReturnAddressPtr(returnAddress)
#define STUB_RETURN_ADDRESS stackHack.savedReturnAddress
#else
#define STUB_INIT_STACK_FRAME(stackFrame) JITStackFrame& stackFrame = *reinterpret_cast_ptr<JITStackFrame*>(STUB_ARGS)
#define STUB_SET_RETURN_ADDRESS(returnAddress) *stackFrame.returnAddressSlot() = ReturnAddressPtr(returnAddress)
#define STUB_RETURN_ADDRESS *stackFrame.returnAddressSlot()
#endif
// The reason this is not inlined is to avoid having to do a PIC branch
// to get the address of the ctiVMThrowTrampoline function. It's also
// good to keep the code size down by leaving as much of the exception
// handling code out of line as possible.
static NEVER_INLINE void returnToThrowTrampoline(VM* vm, ReturnAddressPtr exceptionLocation, ReturnAddressPtr& returnAddressSlot)
{
RELEASE_ASSERT(vm->exception());
vm->exceptionLocation = exceptionLocation;
returnAddressSlot = ReturnAddressPtr(FunctionPtr(ctiVMThrowTrampoline));
}
#define VM_THROW_EXCEPTION() \
do { \
VM_THROW_EXCEPTION_AT_END(); \
return 0; \
} while (0)
#define VM_THROW_EXCEPTION_AT_END() \
do {\
returnToThrowTrampoline(stackFrame.vm, STUB_RETURN_ADDRESS, STUB_RETURN_ADDRESS);\
} while (0)
#define CHECK_FOR_EXCEPTION() \
do { \
if (UNLIKELY(stackFrame.vm->exception())) \
VM_THROW_EXCEPTION(); \
} while (0)
#define CHECK_FOR_EXCEPTION_AT_END() \
do { \
if (UNLIKELY(stackFrame.vm->exception())) \
VM_THROW_EXCEPTION_AT_END(); \
} while (0)
#define CHECK_FOR_EXCEPTION_VOID() \
do { \
if (UNLIKELY(stackFrame.vm->exception())) { \
VM_THROW_EXCEPTION_AT_END(); \
return; \
} \
} while (0)
class ErrorFunctor {
public:
virtual ~ErrorFunctor() { }
virtual JSValue operator()(ExecState*) = 0;
};
class ErrorWithExecFunctor : public ErrorFunctor {
public:
typedef JSObject* (*Factory)(ExecState* exec);
ErrorWithExecFunctor(Factory factory)
: m_factory(factory)
{
}
JSValue operator()(ExecState* exec)
{
return m_factory(exec);
}
private:
Factory m_factory;
};
class ErrorWithExecAndCalleeFunctor : public ErrorFunctor {
public:
typedef JSObject* (*Factory)(ExecState* exec, JSValue callee);
ErrorWithExecAndCalleeFunctor(Factory factory, JSValue callee)
: m_factory(factory), m_callee(callee)
{
}
JSValue operator()(ExecState* exec)
{
return m_factory(exec, m_callee);
}
private:
Factory m_factory;
JSValue m_callee;
};
// Helper function for JIT stubs that may throw an exception in the middle of
// processing a function call. This function rolls back the stack to
// our caller, so exception processing can proceed from a valid state.
template<typename T> static T throwExceptionFromOpCall(JITStackFrame& jitStackFrame, CallFrame* newCallFrame, ReturnAddressPtr& returnAddressSlot, ErrorFunctor* createError = 0)
{
CallFrame* callFrame = newCallFrame->callerFrame()->removeHostCallFrameFlag();
jitStackFrame.callFrame = callFrame;
callFrame->vm().topCallFrame = callFrame;
if (createError)
callFrame->vm().throwException(callFrame, (*createError)(callFrame));
ASSERT(callFrame->vm().exception());
returnToThrowTrampoline(&callFrame->vm(), ReturnAddressPtr(newCallFrame->returnPC()), returnAddressSlot);
return T();
}
// If the CPU specific header does not provide an implementation, use the default one here.
#ifndef DEFINE_STUB_FUNCTION
#define DEFINE_STUB_FUNCTION(rtype, op) rtype JIT_STUB cti_##op(STUB_ARGS_DECLARATION)
#endif
DEFINE_STUB_FUNCTION(void, handle_watchdog_timer)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
VM* vm = stackFrame.vm;
if (UNLIKELY(vm->watchdog.didFire(callFrame))) {
vm->throwException(callFrame, createTerminatedExecutionException(vm));
VM_THROW_EXCEPTION_AT_END();
return;
}
}
DEFINE_STUB_FUNCTION(void*, stack_check)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
if (UNLIKELY(!stackFrame.stack->grow(&callFrame->registers()[callFrame->codeBlock()->m_numCalleeRegisters]))) {
ErrorWithExecFunctor functor = ErrorWithExecFunctor(createStackOverflowError);
return throwExceptionFromOpCall<void*>(stackFrame, callFrame, STUB_RETURN_ADDRESS, &functor);
}
return callFrame;
}
DEFINE_STUB_FUNCTION(JSObject*, op_new_object)
{
STUB_INIT_STACK_FRAME(stackFrame);
return constructEmptyObject(stackFrame.callFrame, stackFrame.args[0].structure());
}
DEFINE_STUB_FUNCTION(void, op_put_by_id_generic)
{
STUB_INIT_STACK_FRAME(stackFrame);
PutPropertySlot slot(
stackFrame.callFrame->codeBlock()->isStrictMode(),
stackFrame.callFrame->codeBlock()->putByIdContext());
stackFrame.args[0].jsValue().put(stackFrame.callFrame, stackFrame.args[1].identifier(), stackFrame.args[2].jsValue(), slot);
CHECK_FOR_EXCEPTION_AT_END();
}
DEFINE_STUB_FUNCTION(void, op_put_by_id_direct_generic)
{
STUB_INIT_STACK_FRAME(stackFrame);
PutPropertySlot slot(
stackFrame.callFrame->codeBlock()->isStrictMode(),
stackFrame.callFrame->codeBlock()->putByIdContext());
JSValue baseValue = stackFrame.args[0].jsValue();
ASSERT(baseValue.isObject());
asObject(baseValue)->putDirect(stackFrame.callFrame->vm(), stackFrame.args[1].identifier(), stackFrame.args[2].jsValue(), slot);
CHECK_FOR_EXCEPTION_AT_END();
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_generic)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
Identifier& ident = stackFrame.args[1].identifier();
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(callFrame, ident, slot);
CHECK_FOR_EXCEPTION_AT_END();
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(void, op_put_by_id)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
Identifier& ident = stackFrame.args[1].identifier();
CodeBlock* codeBlock = stackFrame.callFrame->codeBlock();
StructureStubInfo* stubInfo = &codeBlock->getStubInfo(STUB_RETURN_ADDRESS);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
PutPropertySlot slot(
callFrame->codeBlock()->isStrictMode(),
callFrame->codeBlock()->putByIdContext());
stackFrame.args[0].jsValue().put(callFrame, ident, stackFrame.args[2].jsValue(), slot);
if (accessType == static_cast<AccessType>(stubInfo->accessType)) {
stubInfo->setSeen();
tryCachePutByID(callFrame, codeBlock, STUB_RETURN_ADDRESS, stackFrame.args[0].jsValue(), slot, stubInfo, false);
}
CHECK_FOR_EXCEPTION_AT_END();
}
DEFINE_STUB_FUNCTION(void, op_put_by_id_direct)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
Identifier& ident = stackFrame.args[1].identifier();
CodeBlock* codeBlock = stackFrame.callFrame->codeBlock();
StructureStubInfo* stubInfo = &codeBlock->getStubInfo(STUB_RETURN_ADDRESS);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
PutPropertySlot slot(
callFrame->codeBlock()->isStrictMode(),
callFrame->codeBlock()->putByIdContext());
JSValue baseValue = stackFrame.args[0].jsValue();
ASSERT(baseValue.isObject());
asObject(baseValue)->putDirect(callFrame->vm(), ident, stackFrame.args[2].jsValue(), slot);
if (accessType == static_cast<AccessType>(stubInfo->accessType)) {
stubInfo->setSeen();
tryCachePutByID(callFrame, codeBlock, STUB_RETURN_ADDRESS, stackFrame.args[0].jsValue(), slot, stubInfo, true);
}
CHECK_FOR_EXCEPTION_AT_END();
}
DEFINE_STUB_FUNCTION(void, op_put_by_id_fail)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
Identifier& ident = stackFrame.args[1].identifier();
PutPropertySlot slot(
callFrame->codeBlock()->isStrictMode(),
callFrame->codeBlock()->putByIdContext());
stackFrame.args[0].jsValue().put(callFrame, ident, stackFrame.args[2].jsValue(), slot);
CHECK_FOR_EXCEPTION_AT_END();
}
DEFINE_STUB_FUNCTION(void, op_put_by_id_direct_fail)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
Identifier& ident = stackFrame.args[1].identifier();
PutPropertySlot slot(
callFrame->codeBlock()->isStrictMode(),
callFrame->codeBlock()->putByIdContext());
JSValue baseValue = stackFrame.args[0].jsValue();
ASSERT(baseValue.isObject());
asObject(baseValue)->putDirect(callFrame->vm(), ident, stackFrame.args[2].jsValue(), slot);
CHECK_FOR_EXCEPTION_AT_END();
}
DEFINE_STUB_FUNCTION(JSObject*, op_put_by_id_transition_realloc)
{
STUB_INIT_STACK_FRAME(stackFrame);
JSValue baseValue = stackFrame.args[0].jsValue();
int32_t oldSize = stackFrame.args[3].int32();
Structure* newStructure = stackFrame.args[4].structure();
int32_t newSize = newStructure->outOfLineCapacity();
ASSERT(oldSize >= 0);
ASSERT(newSize > oldSize);
ASSERT(baseValue.isObject());
JSObject* base = asObject(baseValue);
VM& vm = *stackFrame.vm;
Butterfly* butterfly = base->growOutOfLineStorage(vm, oldSize, newSize);
base->setStructureAndButterfly(vm, newStructure, butterfly);
return base;
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
Identifier& ident = stackFrame.args[1].identifier();
CodeBlock* codeBlock = stackFrame.callFrame->codeBlock();
StructureStubInfo* stubInfo = &codeBlock->getStubInfo(STUB_RETURN_ADDRESS);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(callFrame, ident, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return JSValue::encode(result);
if (!stubInfo->seenOnce())
stubInfo->setSeen();
else
tryCacheGetByID(callFrame, codeBlock, STUB_RETURN_ADDRESS, baseValue, ident, slot, stubInfo);
CHECK_FOR_EXCEPTION_AT_END();
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_self_fail)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
Identifier& ident = stackFrame.args[1].identifier();
CodeBlock* codeBlock = callFrame->codeBlock();
StructureStubInfo* stubInfo = &codeBlock->getStubInfo(STUB_RETURN_ADDRESS);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(callFrame, ident, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return JSValue::encode(result);
CHECK_FOR_EXCEPTION();
ConcurrentJITLocker locker(codeBlock->m_lock);
if (baseValue.isCell()
&& slot.isCacheable()
&& !baseValue.asCell()->structure()->isUncacheableDictionary()
&& slot.slotBase() == baseValue) {
PolymorphicAccessStructureList* polymorphicStructureList;
int listIndex = 1;
if (stubInfo->accessType == access_unset)
stubInfo->initGetByIdSelf(callFrame->vm(), codeBlock->ownerExecutable(), baseValue.asCell()->structure());
if (stubInfo->accessType == access_get_by_id_self) {
ASSERT(!stubInfo->stubRoutine);
polymorphicStructureList = new PolymorphicAccessStructureList(callFrame->vm(), codeBlock->ownerExecutable(), 0, stubInfo->u.getByIdSelf.baseObjectStructure.get(), true);
stubInfo->initGetByIdSelfList(polymorphicStructureList, 1);
} else {
polymorphicStructureList = stubInfo->u.getByIdSelfList.structureList;
listIndex = stubInfo->u.getByIdSelfList.listSize;
}
if (listIndex < POLYMORPHIC_LIST_CACHE_SIZE) {
stubInfo->u.getByIdSelfList.listSize++;
JIT::compileGetByIdSelfList(callFrame->scope()->vm(), codeBlock, stubInfo, polymorphicStructureList, listIndex, baseValue.asCell()->structure(), ident, slot, slot.cachedOffset());
if (listIndex == (POLYMORPHIC_LIST_CACHE_SIZE - 1))
ctiPatchCallByReturnAddress(codeBlock, STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_generic));
}
} else
ctiPatchCallByReturnAddress(callFrame->codeBlock(), STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_generic));
return JSValue::encode(result);
}
static PolymorphicAccessStructureList* getPolymorphicAccessStructureListSlot(VM& vm, ScriptExecutable* owner, StructureStubInfo* stubInfo, int& listIndex)
{
PolymorphicAccessStructureList* prototypeStructureList = 0;
listIndex = 1;
switch (stubInfo->accessType) {
case access_get_by_id_proto:
prototypeStructureList = new PolymorphicAccessStructureList(vm, owner, stubInfo->stubRoutine, stubInfo->u.getByIdProto.baseObjectStructure.get(), stubInfo->u.getByIdProto.prototypeStructure.get(), true);
stubInfo->stubRoutine.clear();
stubInfo->initGetByIdProtoList(prototypeStructureList, 2);
break;
case access_get_by_id_chain:
prototypeStructureList = new PolymorphicAccessStructureList(vm, owner, stubInfo->stubRoutine, stubInfo->u.getByIdChain.baseObjectStructure.get(), stubInfo->u.getByIdChain.chain.get(), true);
stubInfo->stubRoutine.clear();
stubInfo->initGetByIdProtoList(prototypeStructureList, 2);
break;
case access_get_by_id_proto_list:
prototypeStructureList = stubInfo->u.getByIdProtoList.structureList;
listIndex = stubInfo->u.getByIdProtoList.listSize;
if (listIndex < POLYMORPHIC_LIST_CACHE_SIZE)
stubInfo->u.getByIdProtoList.listSize++;
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
ASSERT(listIndex <= POLYMORPHIC_LIST_CACHE_SIZE);
return prototypeStructureList;
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_getter_stub)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
JSValue result = callGetter(callFrame, stackFrame.args[1].jsObject(), stackFrame.args[0].jsObject());
if (callFrame->hadException())
returnToThrowTrampoline(&callFrame->vm(), stackFrame.args[2].returnAddress(), STUB_RETURN_ADDRESS);
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_custom_stub)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
JSObject* slotBase = stackFrame.args[0].jsObject();
PropertySlot::GetValueFunc getter = reinterpret_cast<PropertySlot::GetValueFunc>(stackFrame.args[1].asPointer);
const Identifier& ident = stackFrame.args[2].identifier();
JSValue result = getter(callFrame, slotBase, ident);
if (callFrame->hadException())
returnToThrowTrampoline(&callFrame->vm(), stackFrame.args[3].returnAddress(), STUB_RETURN_ADDRESS);
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_proto_list)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
const Identifier& propertyName = stackFrame.args[1].identifier();
CodeBlock* codeBlock = callFrame->codeBlock();
StructureStubInfo* stubInfo = &codeBlock->getStubInfo(STUB_RETURN_ADDRESS);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(callFrame, propertyName, slot);
CHECK_FOR_EXCEPTION();
if (accessType != static_cast<AccessType>(stubInfo->accessType)
|| !baseValue.isCell()
|| !slot.isCacheable()
|| baseValue.asCell()->structure()->isDictionary()
|| baseValue.asCell()->structure()->typeInfo().prohibitsPropertyCaching()) {
ctiPatchCallByReturnAddress(callFrame->codeBlock(), STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_proto_fail));
return JSValue::encode(result);
}
ConcurrentJITLocker locker(codeBlock->m_lock);
Structure* structure = baseValue.asCell()->structure();
JSObject* slotBaseObject = asObject(slot.slotBase());
PropertyOffset offset = slot.cachedOffset();
if (slot.slotBase() == baseValue)
ctiPatchCallByReturnAddress(codeBlock, STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_proto_fail));
else if (slot.slotBase() == baseValue.asCell()->structure()->prototypeForLookup(callFrame)) {
ASSERT(!baseValue.asCell()->structure()->isDictionary());
if (baseValue.asCell()->structure()->typeInfo().hasImpureGetOwnPropertySlot()) {
ctiPatchCallByReturnAddress(codeBlock, STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_proto_fail));
return JSValue::encode(result);
}
// Since we're accessing a prototype in a loop, it's a good bet that it
// should not be treated as a dictionary.
if (slotBaseObject->structure()->isDictionary()) {
slotBaseObject->flattenDictionaryObject(callFrame->vm());
offset = slotBaseObject->structure()->get(callFrame->vm(), propertyName);
}
int listIndex;
PolymorphicAccessStructureList* prototypeStructureList = getPolymorphicAccessStructureListSlot(callFrame->vm(), codeBlock->ownerExecutable(), stubInfo, listIndex);
if (listIndex < POLYMORPHIC_LIST_CACHE_SIZE) {
JIT::compileGetByIdProtoList(callFrame->scope()->vm(), callFrame, codeBlock, stubInfo, prototypeStructureList, listIndex, structure, slotBaseObject->structure(), propertyName, slot, offset);
if (listIndex == (POLYMORPHIC_LIST_CACHE_SIZE - 1))
ctiPatchCallByReturnAddress(codeBlock, STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_proto_list_full));
}
} else {
size_t count = normalizePrototypeChainForChainAccess(callFrame, baseValue, slot.slotBase(), propertyName, offset);
if (count == InvalidPrototypeChain) {
ctiPatchCallByReturnAddress(codeBlock, STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_proto_fail));
return JSValue::encode(result);
}
ASSERT(!baseValue.asCell()->structure()->isDictionary());
int listIndex;
PolymorphicAccessStructureList* prototypeStructureList = getPolymorphicAccessStructureListSlot(callFrame->vm(), codeBlock->ownerExecutable(), stubInfo, listIndex);
if (listIndex < POLYMORPHIC_LIST_CACHE_SIZE) {
StructureChain* protoChain = structure->prototypeChain(callFrame);
JIT::compileGetByIdChainList(callFrame->scope()->vm(), callFrame, codeBlock, stubInfo, prototypeStructureList, listIndex, structure, protoChain, count, propertyName, slot, offset);
if (listIndex == (POLYMORPHIC_LIST_CACHE_SIZE - 1))
ctiPatchCallByReturnAddress(codeBlock, STUB_RETURN_ADDRESS, FunctionPtr(cti_op_get_by_id_proto_list_full));
}
}
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_proto_list_full)
{
STUB_INIT_STACK_FRAME(stackFrame);
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(stackFrame.callFrame, stackFrame.args[1].identifier(), slot);
CHECK_FOR_EXCEPTION_AT_END();
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_proto_fail)
{
STUB_INIT_STACK_FRAME(stackFrame);
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(stackFrame.callFrame, stackFrame.args[1].identifier(), slot);
CHECK_FOR_EXCEPTION_AT_END();
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_array_fail)
{
STUB_INIT_STACK_FRAME(stackFrame);
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(stackFrame.callFrame, stackFrame.args[1].identifier(), slot);
CHECK_FOR_EXCEPTION_AT_END();
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_get_by_id_string_fail)
{
STUB_INIT_STACK_FRAME(stackFrame);
JSValue baseValue = stackFrame.args[0].jsValue();
PropertySlot slot(baseValue);
JSValue result = baseValue.get(stackFrame.callFrame, stackFrame.args[1].identifier(), slot);
CHECK_FOR_EXCEPTION_AT_END();
return JSValue::encode(result);
}
DEFINE_STUB_FUNCTION(EncodedJSValue, op_check_has_instance)
{
STUB_INIT_STACK_FRAME(stackFrame);
CallFrame* callFrame = stackFrame.callFrame;
JSValue value = stackFrame.args[0].jsValue();
JSValue baseVal = stackFrame.args[1].jsValue();
if (baseVal.isObject()) {
JSObject* baseObject = asObject(baseVal);
ASSERT(!baseObject->structure()->typeInfo().implementsDefaultHasInstance());
if (baseObject->structure()->typeInfo().implementsHasInstance()) {
bool result = baseObject->methodTable()->customHasInstance(baseObject, callFrame, value);
CHECK_FOR_EXCEPTION_AT_END();
return JSValue::encode(jsBoolean(result));
}
}
stackFrame.vm->throwException(callFrame, createInvalidParameterError(callFrame, "instanceof", baseVal));
VM_THROW_EXCEPTION_AT_END();
return JSValue::encode(JSValue());
}
#if ENABLE(DFG_JIT)
DEFINE_STUB_FUNCTION(void, optimize)
{
STUB_INIT_STACK_FRAME(stackFrame);
// 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(stackFrame.vm->heap);
CallFrame* callFrame = stackFrame.callFrame;
CodeBlock* codeBlock = callFrame->codeBlock();
unsigned bytecodeIndex = stackFrame.args[0].int32();
if (bytecodeIndex) {
// If we're attempting to OSR from a loop, assume that this should be
// separately optimized.
codeBlock->m_shouldAlwaysBeInlined = false;
}
if (Options::verboseOSR()) {
dataLog(
*codeBlock, ": Entered optimize with bytecodeIndex = ", bytecodeIndex,
", executeCounter = ", codeBlock->jitExecuteCounter(),
", optimizationDelayCounter = ", codeBlock->reoptimizationRetryCounter(),
", exitCounter = ");
if (codeBlock->hasOptimizedReplacement())
dataLog(codeBlock->replacement()->osrExitCounter());
else
dataLog("N/A");
dataLog("\n");
}
if (!codeBlock->checkIfOptimizationThresholdReached()) {
codeBlock->updateAllPredictions();
if (Options::verboseOSR())
dataLog("Choosing not to optimize ", *codeBlock, " yet, because the threshold hasn't been reached.\n");
return;
}
if (codeBlock->m_shouldAlwaysBeInlined) {
codeBlock->updateAllPredictions();
codeBlock->optimizeAfterWarmUp();
if (Options::verboseOSR())
dataLog("Choosing not to optimize ", *codeBlock, " yet, because m_shouldAlwaysBeInlined == true.\n");
return;
}
// We cannot be in the process of asynchronous compilation and also have an optimized
// replacement.
ASSERT(
!stackFrame.vm->worklist
|| !(stackFrame.vm->worklist->compilationState(codeBlock) != DFG::Worklist::NotKnown
&& codeBlock->hasOptimizedReplacement()));
DFG::Worklist::State worklistState;
if (stackFrame.vm->worklist) {
// The call to DFG::Worklist::completeAllReadyPlansForVM() will complete all ready
// (i.e. compiled) code blocks. But if it completes ours, we also need to know
// what the result was so that we don't plow ahead and attempt OSR or immediate
// reoptimization. This will have already also set the appropriate JIT execution
// count threshold depending on what happened, so if the compilation was anything
// but successful we just want to return early. See the case for worklistState ==
// DFG::Worklist::Compiled, below.
// Note that we could have alternatively just called Worklist::compilationState()
// here, and if it returned Compiled, we could have then called
// completeAndScheduleOSR() below. But that would have meant that it could take
// longer for code blocks to be completed: they would only complete when *their*
// execution count trigger fired; but that could take a while since the firing is
// racy. It could also mean that code blocks that never run again after being
// compiled would sit on the worklist until next GC. That's fine, but it's
// probably a waste of memory. Our goal here is to complete code blocks as soon as
// possible in order to minimize the chances of us executing baseline code after
// optimized code is already available.
worklistState =
stackFrame.vm->worklist->completeAllReadyPlansForVM(*stackFrame.vm, codeBlock);
} else
worklistState = DFG::Worklist::NotKnown;
if (worklistState == DFG::Worklist::Compiling) {
// We cannot be in the process of asynchronous compilation and also have an optimized
// replacement.
RELEASE_ASSERT(!codeBlock->hasOptimizedReplacement());
codeBlock->setOptimizationThresholdBasedOnCompilationResult(CompilationDeferred);
return;
}
if (worklistState == DFG::Worklist::Compiled) {
// If we don't have an optimized replacement but we did just get compiled, then
// the compilation failed or was invalidated, in which case the execution count
// thresholds have already been set appropriately by
// CodeBlock::setOptimizationThresholdBasedOnCompilationResult() and we have
// nothing left to do.
if (!codeBlock->hasOptimizedReplacement()) {
codeBlock->updateAllPredictions();
if (Options::verboseOSR())
dataLog("Code block ", *codeBlock, " was compiled but it doesn't have an optimized replacement.\n");
return;
}
} else if (codeBlock->hasOptimizedReplacement()) {
if (Options::verboseOSR())
dataLog("Considering OSR ", *codeBlock, " -> ", *codeBlock->replacement(), ".\n");