/*
* Copyright (C) 2008, 2009 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)
#if USE(JSVALUE64)
#include "JIT.h"
#include "CodeBlock.h"
#include "GetterSetter.h"
#include "JITInlineMethods.h"
#include "JITStubCall.h"
#include "JSArray.h"
#include "JSFunction.h"
#include "JSPropertyNameIterator.h"
#include "Interpreter.h"
#include "LinkBuffer.h"
#include "RepatchBuffer.h"
#include "ResultType.h"
#include "SamplingTool.h"
#ifndef NDEBUG
#include <stdio.h>
#endif
using namespace std;
namespace JSC {
JIT::CodePtr JIT::stringGetByValStubGenerator(JSGlobalData* globalData, ExecutablePool* pool)
{
JSInterfaceJIT jit;
JumpList failures;
failures.append(jit.branchPtr(NotEqual, Address(regT0), TrustedImmPtr(globalData->jsStringVPtr)));
failures.append(jit.branchTest32(NonZero, Address(regT0, OBJECT_OFFSETOF(JSString, m_fiberCount))));
// Load string length to regT1, and start the process of loading the data pointer into regT0
jit.load32(Address(regT0, ThunkHelpers::jsStringLengthOffset()), regT2);
jit.loadPtr(Address(regT0, ThunkHelpers::jsStringValueOffset()), regT0);
jit.loadPtr(Address(regT0, ThunkHelpers::stringImplDataOffset()), regT0);
// Do an unsigned compare to simultaneously filter negative indices as well as indices that are too large
failures.append(jit.branch32(AboveOrEqual, regT1, regT2));
// Load the character
jit.load16(BaseIndex(regT0, regT1, TimesTwo, 0), regT0);
failures.append(jit.branch32(AboveOrEqual, regT0, TrustedImm32(0x100)));
jit.move(TrustedImmPtr(globalData->smallStrings.singleCharacterStrings()), regT1);
jit.loadPtr(BaseIndex(regT1, regT0, ScalePtr, 0), regT0);
jit.ret();
failures.link(&jit);
jit.move(TrustedImm32(0), regT0);
jit.ret();
LinkBuffer patchBuffer(&jit, pool, 0);
return patchBuffer.finalizeCode().m_code;
}
void JIT::emit_op_get_by_val(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned base = currentInstruction[2].u.operand;
unsigned property = currentInstruction[3].u.operand;
emitGetVirtualRegisters(base, regT0, property, regT1);
emitJumpSlowCaseIfNotImmediateInteger(regT1);
// This is technically incorrect - we're zero-extending an int32. On the hot path this doesn't matter.
// We check the value as if it was a uint32 against the m_vectorLength - which will always fail if
// number was signed since m_vectorLength is always less than intmax (since the total allocation
// size is always less than 4Gb). As such zero extending wil have been correct (and extending the value
// to 64-bits is necessary since it's used in the address calculation. We zero extend rather than sign
// extending since it makes it easier to re-tag the value in the slow case.
zeroExtend32ToPtr(regT1, regT1);
emitJumpSlowCaseIfNotJSCell(regT0, base);
addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsArrayVPtr)));
loadPtr(Address(regT0, JSArray::storageOffset()), regT2);
addSlowCase(branch32(AboveOrEqual, regT1, Address(regT0, JSArray::vectorLengthOffset())));
loadPtr(BaseIndex(regT2, regT1, ScalePtr, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])), regT0);
addSlowCase(branchTestPtr(Zero, regT0));
emitPutVirtualRegister(dst);
}
void JIT::emitSlow_op_get_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned base = currentInstruction[2].u.operand;
unsigned property = currentInstruction[3].u.operand;
linkSlowCase(iter); // property int32 check
linkSlowCaseIfNotJSCell(iter, base); // base cell check
Jump nonCell = jump();
linkSlowCase(iter); // base array check
Jump notString = branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsStringVPtr));
emitNakedCall(m_globalData->getCTIStub(stringGetByValStubGenerator));
Jump failed = branchTestPtr(Zero, regT0);
emitPutVirtualRegister(dst, regT0);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_get_by_val));
failed.link(this);
notString.link(this);
nonCell.link(this);
linkSlowCase(iter); // vector length check
linkSlowCase(iter); // empty value
JITStubCall stubCall(this, cti_op_get_by_val);
stubCall.addArgument(base, regT2);
stubCall.addArgument(property, regT2);
stubCall.call(dst);
}
void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch)
{
loadPtr(Address(base, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), scratch);
loadPtr(BaseIndex(scratch, offset, ScalePtr, 0), result);
}
void JIT::emit_op_get_by_pname(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned base = currentInstruction[2].u.operand;
unsigned property = currentInstruction[3].u.operand;
unsigned expected = currentInstruction[4].u.operand;
unsigned iter = currentInstruction[5].u.operand;
unsigned i = currentInstruction[6].u.operand;
emitGetVirtualRegister(property, regT0);
addSlowCase(branchPtr(NotEqual, regT0, addressFor(expected)));
emitGetVirtualRegisters(base, regT0, iter, regT1);
emitJumpSlowCaseIfNotJSCell(regT0, base);
// Test base's structure
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
addSlowCase(branchPtr(NotEqual, regT2, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure))));
load32(addressFor(i), regT3);
sub32(TrustedImm32(1), regT3);
addSlowCase(branch32(AboveOrEqual, regT3, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_numCacheableSlots))));
compileGetDirectOffset(regT0, regT0, regT3, regT1);
emitPutVirtualRegister(dst, regT0);
}
void JIT::emitSlow_op_get_by_pname(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned base = currentInstruction[2].u.operand;
unsigned property = currentInstruction[3].u.operand;
linkSlowCase(iter);
linkSlowCaseIfNotJSCell(iter, base);
linkSlowCase(iter);
linkSlowCase(iter);
JITStubCall stubCall(this, cti_op_get_by_val);
stubCall.addArgument(base, regT2);
stubCall.addArgument(property, regT2);
stubCall.call(dst);
}
void JIT::emit_op_put_by_val(Instruction* currentInstruction)
{
unsigned base = currentInstruction[1].u.operand;
unsigned property = currentInstruction[2].u.operand;
unsigned value = currentInstruction[3].u.operand;
emitGetVirtualRegisters(base, regT0, property, regT1);
emitJumpSlowCaseIfNotImmediateInteger(regT1);
// See comment in op_get_by_val.
zeroExtend32ToPtr(regT1, regT1);
emitJumpSlowCaseIfNotJSCell(regT0, base);
addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsArrayVPtr)));
addSlowCase(branch32(AboveOrEqual, regT1, Address(regT0, JSArray::vectorLengthOffset())));
loadPtr(Address(regT0, JSArray::storageOffset()), regT2);
Jump empty = branchTestPtr(Zero, BaseIndex(regT2, regT1, ScalePtr, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
Label storeResult(this);
emitGetVirtualRegister(value, regT0);
storePtr(regT0, BaseIndex(regT2, regT1, ScalePtr, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
Jump end = jump();
empty.link(this);
add32(TrustedImm32(1), Address(regT2, OBJECT_OFFSETOF(ArrayStorage, m_numValuesInVector)));
branch32(Below, regT1, Address(regT2, OBJECT_OFFSETOF(ArrayStorage, m_length))).linkTo(storeResult, this);
move(regT1, regT0);
add32(TrustedImm32(1), regT0);
store32(regT0, Address(regT2, OBJECT_OFFSETOF(ArrayStorage, m_length)));
jump().linkTo(storeResult, this);
end.link(this);
}
void JIT::emit_op_put_by_index(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_put_by_index);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
stubCall.addArgument(currentInstruction[3].u.operand, regT2);
stubCall.call();
}
void JIT::emit_op_put_getter(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_put_getter);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.addArgument(currentInstruction[3].u.operand, regT2);
stubCall.call();
}
void JIT::emit_op_put_setter(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_put_setter);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.addArgument(currentInstruction[3].u.operand, regT2);
stubCall.call();
}
void JIT::emit_op_del_by_id(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_del_by_id);
stubCall.addArgument(currentInstruction[2].u.operand, regT2);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[3].u.operand)));
stubCall.call(currentInstruction[1].u.operand);
}
#if !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
/* ------------------------------ BEGIN: !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS) ------------------------------ */
// Treat these as nops - the call will be handed as a regular get_by_id/op_call pair.
void JIT::emit_op_method_check(Instruction*) {}
void JIT::emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&) { ASSERT_NOT_REACHED(); }
#if ENABLE(JIT_OPTIMIZE_METHOD_CALLS)
#error "JIT_OPTIMIZE_METHOD_CALLS requires JIT_OPTIMIZE_PROPERTY_ACCESS"
#endif
void JIT::emit_op_get_by_id(Instruction* currentInstruction)
{
unsigned resultVReg = currentInstruction[1].u.operand;
unsigned baseVReg = currentInstruction[2].u.operand;
Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
emitGetVirtualRegister(baseVReg, regT0);
JITStubCall stubCall(this, cti_op_get_by_id_generic);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(ident));
stubCall.call(resultVReg);
m_propertyAccessInstructionIndex++;
}
void JIT::emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&)
{
ASSERT_NOT_REACHED();
}
void JIT::emit_op_put_by_id(Instruction* currentInstruction)
{
unsigned baseVReg = currentInstruction[1].u.operand;
Identifier* ident = &(m_codeBlock->identifier(currentInstruction[2].u.operand));
unsigned valueVReg = currentInstruction[3].u.operand;
unsigned direct = currentInstruction[8].u.operand;
emitGetVirtualRegisters(baseVReg, regT0, valueVReg, regT1);
JITStubCall stubCall(this, direct ? cti_op_put_by_id_direct_generic, cti_op_put_by_id_generic);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(ident));
stubCall.addArgument(regT1);
stubCall.call();
m_propertyAccessInstructionIndex++;
}
void JIT::emitSlow_op_put_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&)
{
ASSERT_NOT_REACHED();
}
#else // !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
/* ------------------------------ BEGIN: ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS) ------------------------------ */
#if ENABLE(JIT_OPTIMIZE_METHOD_CALLS)
void JIT::emit_op_method_check(Instruction* currentInstruction)
{
// Assert that the following instruction is a get_by_id.
ASSERT(m_interpreter->getOpcodeID((currentInstruction + OPCODE_LENGTH(op_method_check))->u.opcode) == op_get_by_id);
currentInstruction += OPCODE_LENGTH(op_method_check);
unsigned resultVReg = currentInstruction[1].u.operand;
unsigned baseVReg = currentInstruction[2].u.operand;
Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
emitGetVirtualRegister(baseVReg, regT0);
// Do the method check - check the object & its prototype's structure inline (this is the common case).
m_methodCallCompilationInfo.append(MethodCallCompilationInfo(m_propertyAccessInstructionIndex));
MethodCallCompilationInfo& info = m_methodCallCompilationInfo.last();
Jump notCell = emitJumpIfNotJSCell(regT0);
BEGIN_UNINTERRUPTED_SEQUENCE(sequenceMethodCheck);
Jump structureCheck = branchPtrWithPatch(NotEqual, Address(regT0, JSCell::structureOffset()), info.structureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure)));
DataLabelPtr protoStructureToCompare, protoObj = moveWithPatch(TrustedImmPtr(0), regT1);
Jump protoStructureCheck = branchPtrWithPatch(NotEqual, Address(regT1, JSCell::structureOffset()), protoStructureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure)));
// This will be relinked to load the function without doing a load.
DataLabelPtr putFunction = moveWithPatch(TrustedImmPtr(0), regT0);
END_UNINTERRUPTED_SEQUENCE(sequenceMethodCheck);
Jump match = jump();
ASSERT_JIT_OFFSET(differenceBetween(info.structureToCompare, protoObj), patchOffsetMethodCheckProtoObj);
ASSERT_JIT_OFFSET(differenceBetween(info.structureToCompare, protoStructureToCompare), patchOffsetMethodCheckProtoStruct);
ASSERT_JIT_OFFSET(differenceBetween(info.structureToCompare, putFunction), patchOffsetMethodCheckPutFunction);
// Link the failure cases here.
notCell.link(this);
structureCheck.link(this);
protoStructureCheck.link(this);
// Do a regular(ish) get_by_id (the slow case will be link to
// cti_op_get_by_id_method_check instead of cti_op_get_by_id.
compileGetByIdHotPath(resultVReg, baseVReg, ident, m_propertyAccessInstructionIndex++);
match.link(this);
emitPutVirtualRegister(resultVReg);
// We've already generated the following get_by_id, so make sure it's skipped over.
m_bytecodeOffset += OPCODE_LENGTH(op_get_by_id);
}
void JIT::emitSlow_op_method_check(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
currentInstruction += OPCODE_LENGTH(op_method_check);
unsigned resultVReg = currentInstruction[1].u.operand;
unsigned baseVReg = currentInstruction[2].u.operand;
Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
compileGetByIdSlowCase(resultVReg, baseVReg, ident, iter, true);
// We've already generated the following get_by_id, so make sure it's skipped over.
m_bytecodeOffset += OPCODE_LENGTH(op_get_by_id);
}
#else //!ENABLE(JIT_OPTIMIZE_METHOD_CALLS)
// Treat these as nops - the call will be handed as a regular get_by_id/op_call pair.
void JIT::emit_op_method_check(Instruction*) {}
void JIT::emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&) { ASSERT_NOT_REACHED(); }
#endif
void JIT::emit_op_get_by_id(Instruction* currentInstruction)
{
unsigned resultVReg = currentInstruction[1].u.operand;
unsigned baseVReg = currentInstruction[2].u.operand;
Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
emitGetVirtualRegister(baseVReg, regT0);
compileGetByIdHotPath(resultVReg, baseVReg, ident, m_propertyAccessInstructionIndex++);
emitPutVirtualRegister(resultVReg);
}
void JIT::compileGetByIdHotPath(int, int baseVReg, Identifier*, unsigned propertyAccessInstructionIndex)
{
// As for put_by_id, get_by_id requires the offset of the Structure and the offset of the access to be patched.
// Additionally, for get_by_id we need patch the offset of the branch to the slow case (we patch this to jump
// to array-length / prototype access tranpolines, and finally we also the the property-map access offset as a label
// to jump back to if one of these trampolies finds a match.
emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
BEGIN_UNINTERRUPTED_SEQUENCE(sequenceGetByIdHotPath);
Label hotPathBegin(this);
m_propertyAccessCompilationInfo[propertyAccessInstructionIndex].hotPathBegin = hotPathBegin;
DataLabelPtr structureToCompare;
Jump structureCheck = branchPtrWithPatch(NotEqual, Address(regT0, JSCell::structureOffset()), structureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure)));
addSlowCase(structureCheck);
ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, structureToCompare), patchOffsetGetByIdStructure);
ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, structureCheck), patchOffsetGetByIdBranchToSlowCase)
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), regT0);
DataLabel32 displacementLabel = loadPtrWithAddressOffsetPatch(Address(regT0, patchGetByIdDefaultOffset), regT0);
ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, displacementLabel), patchOffsetGetByIdPropertyMapOffset);
Label putResult(this);
END_UNINTERRUPTED_SEQUENCE(sequenceGetByIdHotPath);
ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, putResult), patchOffsetGetByIdPutResult);
}
void JIT::emitSlow_op_get_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned resultVReg = currentInstruction[1].u.operand;
unsigned baseVReg = currentInstruction[2].u.operand;
Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
compileGetByIdSlowCase(resultVReg, baseVReg, ident, iter, false);
}
void JIT::compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck)
{
// As for the hot path of get_by_id, above, we ensure that we can use an architecture specific offset
// so that we only need track one pointer into the slow case code - we track a pointer to the location
// of the call (which we can use to look up the patch information), but should a array-length or
// prototype access trampoline fail we want to bail out back to here. To do so we can subtract back
// the distance from the call to the head of the slow case.
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
BEGIN_UNINTERRUPTED_SEQUENCE(sequenceGetByIdSlowCase);
#ifndef NDEBUG
Label coldPathBegin(this);
#endif
JITStubCall stubCall(this, isMethodCheck ? cti_op_get_by_id_method_check : cti_op_get_by_id);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(ident));
Call call = stubCall.call(resultVReg);
END_UNINTERRUPTED_SEQUENCE(sequenceGetByIdSlowCase);
ASSERT_JIT_OFFSET(differenceBetween(coldPathBegin, call), patchOffsetGetByIdSlowCaseCall);
// Track the location of the call; this will be used to recover patch information.
m_propertyAccessCompilationInfo[m_propertyAccessInstructionIndex].callReturnLocation = call;
m_propertyAccessInstructionIndex++;
}
void JIT::emit_op_put_by_id(Instruction* currentInstruction)
{
unsigned baseVReg = currentInstruction[1].u.operand;
unsigned valueVReg = currentInstruction[3].u.operand;
unsigned propertyAccessInstructionIndex = m_propertyAccessInstructionIndex++;
// In order to be able to patch both the Structure, and the object offset, we store one pointer,
// to just after the arguments have been loaded into registers 'hotPathBegin', and we generate code
// such that the Structure & offset are always at the same distance from this.
emitGetVirtualRegisters(baseVReg, regT0, valueVReg, regT1);
// Jump to a slow case if either the base object is an immediate, or if the Structure does not match.
emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
BEGIN_UNINTERRUPTED_SEQUENCE(sequencePutById);
Label hotPathBegin(this);
m_propertyAccessCompilationInfo[propertyAccessInstructionIndex].hotPathBegin = hotPathBegin;
// It is important that the following instruction plants a 32bit immediate, in order that it can be patched over.
DataLabelPtr structureToCompare;
addSlowCase(branchPtrWithPatch(NotEqual, Address(regT0, JSCell::structureOffset()), structureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure))));
ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, structureToCompare), patchOffsetPutByIdStructure);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), regT0);
DataLabel32 displacementLabel = storePtrWithAddressOffsetPatch(regT1, Address(regT0, patchGetByIdDefaultOffset));
END_UNINTERRUPTED_SEQUENCE(sequencePutById);
ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, displacementLabel), patchOffsetPutByIdPropertyMapOffset);
}
void JIT::emitSlow_op_put_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned baseVReg = currentInstruction[1].u.operand;
Identifier* ident = &(m_codeBlock->identifier(currentInstruction[2].u.operand));
unsigned direct = currentInstruction[8].u.operand;
unsigned propertyAccessInstructionIndex = m_propertyAccessInstructionIndex++;
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
JITStubCall stubCall(this, direct ? cti_op_put_by_id_direct : cti_op_put_by_id);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(ident));
stubCall.addArgument(regT1);
Call call = stubCall.call();
// Track the location of the call; this will be used to recover patch information.
m_propertyAccessCompilationInfo[propertyAccessInstructionIndex].callReturnLocation = call;
}
// Compile a store into an object's property storage. May overwrite the
// value in objectReg.
void JIT::compilePutDirectOffset(RegisterID base, RegisterID value, Structure* structure, size_t cachedOffset)
{
int offset = cachedOffset * sizeof(JSValue);
if (structure->isUsingInlineStorage())
offset += JSObject::offsetOfInlineStorage();
else
loadPtr(Address(base, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), base);
storePtr(value, Address(base, offset));
}
// Compile a load from an object's property storage. May overwrite base.
void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, Structure* structure, size_t cachedOffset)
{
int offset = cachedOffset * sizeof(JSValue);
if (structure->isUsingInlineStorage()) {
offset += JSObject::offsetOfInlineStorage();
loadPtr(Address(base, offset), result);
} else {
loadPtr(Address(base, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), result);
loadPtr(Address(result, offset), result);
}
}
void JIT::compileGetDirectOffset(JSObject* base, RegisterID result, size_t cachedOffset)
{
loadPtr(static_cast<void*>(&base->m_propertyStorage[cachedOffset]), result);
}
void JIT::testPrototype(JSValue prototype, JumpList& failureCases)
{
if (prototype.isNull())
return;
// We have a special case for X86_64 here because X86 instructions that take immediate values
// only take 32 bit immediate values, wheras the pointer constants we are using here are 64 bit
// values. In the non X86_64 case, the generated code is slightly more efficient because it uses
// two less instructions and doesn't require any scratch registers.
#if CPU(X86_64)
move(TrustedImmPtr(prototype.asCell()->structure()), regT3);
failureCases.append(branchPtr(NotEqual, AbsoluteAddress(prototype.asCell()->addressOfStructure()), regT3));
#else
failureCases.append(branchPtr(NotEqual, AbsoluteAddress(prototype.asCell()->addressOfStructure()), TrustedImmPtr(prototype.asCell()->structure())));
#endif
}
void JIT::privateCompilePutByIdTransition(StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, size_t cachedOffset, StructureChain* chain, ReturnAddressPtr returnAddress, bool direct)
{
JumpList failureCases;
// Check eax is an object of the right Structure.
failureCases.append(emitJumpIfNotJSCell(regT0));
failureCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(oldStructure)));
testPrototype(oldStructure->storedPrototype(), failureCases);
// ecx = baseObject->m_structure
if (!direct) {
for (WriteBarrier<Structure>* it = chain->head(); *it; ++it)
testPrototype((*it)->storedPrototype(), failureCases);
}
Call callTarget;
// emit a call only if storage realloc is needed
bool willNeedStorageRealloc = oldStructure->propertyStorageCapacity() != newStructure->propertyStorageCapacity();
if (willNeedStorageRealloc) {
// This trampoline was called to like a JIT stub; before we can can call again we need to
// remove the return address from the stack, to prevent the stack from becoming misaligned.
preserveReturnAddressAfterCall(regT3);
JITStubCall stubCall(this, cti_op_put_by_id_transition_realloc);
stubCall.skipArgument(); // base
stubCall.skipArgument(); // ident
stubCall.skipArgument(); // value
stubCall.addArgument(TrustedImm32(oldStructure->propertyStorageCapacity()));
stubCall.addArgument(TrustedImm32(newStructure->propertyStorageCapacity()));
stubCall.call(regT0);
emitGetJITStubArg(2, regT1);
restoreReturnAddressBeforeReturn(regT3);
}
storePtrWithWriteBarrier(TrustedImmPtr(newStructure), regT0, Address(regT0, JSCell::structureOffset()));
// write the value
compilePutDirectOffset(regT0, regT1, newStructure, cachedOffset);
ret();
ASSERT(!failureCases.empty());
failureCases.link(this);
restoreArgumentReferenceForTrampoline();
Call failureCall = tailRecursiveCall();
LinkBuffer patchBuffer(this, m_codeBlock->executablePool(), 0);
patchBuffer.link(failureCall, FunctionPtr(direct ? cti_op_put_by_id_direct_fail : cti_op_put_by_id_fail));
if (willNeedStorageRealloc) {
ASSERT(m_calls.size() == 1);
patchBuffer.link(m_calls[0].from, FunctionPtr(cti_op_put_by_id_transition_realloc));
}
CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
stubInfo->stubRoutine = entryLabel;
RepatchBuffer repatchBuffer(m_codeBlock);
repatchBuffer.relinkCallerToTrampoline(returnAddress, entryLabel);
}
void JIT::patchGetByIdSelf(CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, size_t cachedOffset, ReturnAddressPtr returnAddress)
{
RepatchBuffer repatchBuffer(codeBlock);
// We don't want to patch more than once - in future go to cti_op_get_by_id_generic.
// Should probably go to cti_op_get_by_id_fail, but that doesn't do anything interesting right now.
repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_self_fail));
int offset = sizeof(JSValue) * cachedOffset;
// Patch the offset into the propoerty map to load from, then patch the Structure to look for.
repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabelPtrAtOffset(patchOffsetGetByIdStructure), structure);
repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabel32AtOffset(patchOffsetGetByIdPropertyMapOffset), offset);
}
void JIT::patchMethodCallProto(JSGlobalData& globalData, CodeBlock* codeBlock, MethodCallLinkInfo& methodCallLinkInfo, JSFunction* callee, Structure* structure, JSObject* proto, ReturnAddressPtr returnAddress)
{
RepatchBuffer repatchBuffer(codeBlock);
ASSERT(!methodCallLinkInfo.cachedStructure);
methodCallLinkInfo.cachedStructure.set(globalData, codeBlock->ownerExecutable(), structure);
Structure* prototypeStructure = proto->structure();
methodCallLinkInfo.cachedPrototypeStructure.set(globalData, codeBlock->ownerExecutable(), prototypeStructure);
repatchBuffer.repatch(methodCallLinkInfo.structureLabel, structure);
repatchBuffer.repatch(methodCallLinkInfo.structureLabel.dataLabelPtrAtOffset(patchOffsetMethodCheckProtoObj), proto);
repatchBuffer.repatch(methodCallLinkInfo.structureLabel.dataLabelPtrAtOffset(patchOffsetMethodCheckProtoStruct), prototypeStructure);
repatchBuffer.repatch(methodCallLinkInfo.structureLabel.dataLabelPtrAtOffset(patchOffsetMethodCheckPutFunction), callee);
repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id));
}
void JIT::patchPutByIdReplace(CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, size_t cachedOffset, ReturnAddressPtr returnAddress, bool direct)
{
RepatchBuffer repatchBuffer(codeBlock);
// We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
// Should probably go to cti_op_put_by_id_fail, but that doesn't do anything interesting right now.
repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic));
int offset = sizeof(JSValue) * cachedOffset;
// Patch the offset into the propoerty map to load from, then patch the Structure to look for.
repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabelPtrAtOffset(patchOffsetPutByIdStructure), structure);
repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabel32AtOffset(patchOffsetPutByIdPropertyMapOffset), offset);
}
void JIT::privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress)
{
StructureStubInfo* stubInfo = &m_codeBlock->getStubInfo(returnAddress);
// Check eax is an array
Jump failureCases1 = branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsArrayVPtr));
// Checks out okay! - get the length from the storage
loadPtr(Address(regT0, JSArray::storageOffset()), regT3);
load32(Address(regT3, OBJECT_OFFSETOF(ArrayStorage, m_length)), regT2);
Jump failureCases2 = branch32(LessThan, regT2, TrustedImm32(0));
emitFastArithIntToImmNoCheck(regT2, regT0);
Jump success = jump();
LinkBuffer patchBuffer(this, m_codeBlock->executablePool(), 0);
// Use the patch information to link the failure cases back to the original slow case routine.
CodeLocationLabel slowCaseBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
patchBuffer.link(failureCases1, slowCaseBegin);
patchBuffer.link(failureCases2, slowCaseBegin);
// On success return back to the hot patch code, at a point it will perform the store to dest for us.
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
// Track the stub we have created so that it will be deleted later.
CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
stubInfo->stubRoutine = entryLabel;
// Finally patch the jump to slow case back in the hot path to jump here instead.
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
RepatchBuffer repatchBuffer(m_codeBlock);
repatchBuffer.relink(jumpLocation, entryLabel);
// We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_array_fail));
}
void JIT::privateCompileGetByIdProto(StructureStubInfo* stubInfo, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame)
{
// The prototype object definitely exists (if this stub exists the CodeBlock is referencing a Structure that is
// referencing the prototype object - let's speculatively load it's table nice and early!)
JSObject* protoObject = asObject(structure->prototypeForLookup(callFrame));
// Check eax is an object of the right Structure.
Jump failureCases1 = checkStructure(regT0, structure);
// Check the prototype object's Structure had not changed.
const void* prototypeStructureAddress = protoObject->addressOfStructure();
#if CPU(X86_64)
move(TrustedImmPtr(prototypeStructure), regT3);
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), regT3);
#else
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), TrustedImmPtr(prototypeStructure));
#endif
bool needsStubLink = false;
// Checks out okay!
if (slot.cachedPropertyType() == PropertySlot::Getter) {
needsStubLink = true;
compileGetDirectOffset(protoObject, regT1, cachedOffset);
JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
stubCall.addArgument(regT1);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else if (slot.cachedPropertyType() == PropertySlot::Custom) {
needsStubLink = true;
JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
stubCall.addArgument(TrustedImmPtr(protoObject));
stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else
compileGetDirectOffset(protoObject, regT0, cachedOffset);
Jump success = jump();
LinkBuffer patchBuffer(this, m_codeBlock->executablePool(), 0);
// Use the patch information to link the failure cases back to the original slow case routine.
CodeLocationLabel slowCaseBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
patchBuffer.link(failureCases1, slowCaseBegin);
patchBuffer.link(failureCases2, slowCaseBegin);
// On success return back to the hot patch code, at a point it will perform the store to dest for us.
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
if (needsStubLink) {
for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
if (iter->to)
patchBuffer.link(iter->from, FunctionPtr(iter->to));
}
}
// Track the stub we have created so that it will be deleted later.
CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
stubInfo->stubRoutine = entryLabel;
// Finally patch the jump to slow case back in the hot path to jump here instead.
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
RepatchBuffer repatchBuffer(m_codeBlock);
repatchBuffer.relink(jumpLocation, entryLabel);
// We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_proto_list));
}
void JIT::privateCompileGetByIdSelfList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset)
{
Jump failureCase = checkStructure(regT0, structure);
bool needsStubLink = false;
if (slot.cachedPropertyType() == PropertySlot::Getter) {
needsStubLink = true;
compileGetDirectOffset(regT0, regT1, structure, cachedOffset);
JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
stubCall.addArgument(regT1);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else if (slot.cachedPropertyType() == PropertySlot::Custom) {
needsStubLink = true;
JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else
compileGetDirectOffset(regT0, regT0, structure, cachedOffset);
Jump success = jump();
LinkBuffer patchBuffer(this, m_codeBlock->executablePool(), 0);
if (needsStubLink) {
for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
if (iter->to)
patchBuffer.link(iter->from, FunctionPtr(iter->to));
}
}
// Use the patch information to link the failure cases back to the original slow case routine.
CodeLocationLabel lastProtoBegin = polymorphicStructures->list[currentIndex - 1].stubRoutine;
if (!lastProtoBegin)
lastProtoBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
patchBuffer.link(failureCase, lastProtoBegin);
// On success return back to the hot patch code, at a point it will perform the store to dest for us.
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
polymorphicStructures->list[currentIndex].set(*m_globalData, m_codeBlock->ownerExecutable(), entryLabel, structure);
// Finally patch the jump to slow case back in the hot path to jump here instead.
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
RepatchBuffer repatchBuffer(m_codeBlock);
repatchBuffer.relink(jumpLocation, entryLabel);
}
void JIT::privateCompileGetByIdProtoList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructures, int currentIndex, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, CallFrame* callFrame)
{
// The prototype object definitely exists (if this stub exists the CodeBlock is referencing a Structure that is
// referencing the prototype object - let's speculatively load it's table nice and early!)
JSObject* protoObject = asObject(structure->prototypeForLookup(callFrame));
// Check eax is an object of the right Structure.
Jump failureCases1 = checkStructure(regT0, structure);
// Check the prototype object's Structure had not changed.
const void* prototypeStructureAddress = protoObject->addressOfStructure();
#if CPU(X86_64)
move(TrustedImmPtr(prototypeStructure), regT3);
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), regT3);
#else
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), TrustedImmPtr(prototypeStructure));
#endif
// Checks out okay!
bool needsStubLink = false;
if (slot.cachedPropertyType() == PropertySlot::Getter) {
needsStubLink = true;
compileGetDirectOffset(protoObject, regT1, cachedOffset);
JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
stubCall.addArgument(regT1);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else if (slot.cachedPropertyType() == PropertySlot::Custom) {
needsStubLink = true;
JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
stubCall.addArgument(TrustedImmPtr(protoObject));
stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else
compileGetDirectOffset(protoObject, regT0, cachedOffset);
Jump success = jump();
LinkBuffer patchBuffer(this, m_codeBlock->executablePool(), 0);
if (needsStubLink) {
for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
if (iter->to)
patchBuffer.link(iter->from, FunctionPtr(iter->to));
}
}
// Use the patch information to link the failure cases back to the original slow case routine.
CodeLocationLabel lastProtoBegin = prototypeStructures->list[currentIndex - 1].stubRoutine;
patchBuffer.link(failureCases1, lastProtoBegin);
patchBuffer.link(failureCases2, lastProtoBegin);
// On success return back to the hot patch code, at a point it will perform the store to dest for us.
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
prototypeStructures->list[currentIndex].set(*m_globalData, m_codeBlock->ownerExecutable(), entryLabel, structure, prototypeStructure);
// Finally patch the jump to slow case back in the hot path to jump here instead.
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
RepatchBuffer repatchBuffer(m_codeBlock);
repatchBuffer.relink(jumpLocation, entryLabel);
}
void JIT::privateCompileGetByIdChainList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructures, int currentIndex, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, CallFrame* callFrame)
{
ASSERT(count);
JumpList bucketsOfFail;
// Check eax is an object of the right Structure.
Jump baseObjectCheck = checkStructure(regT0, structure);
bucketsOfFail.append(baseObjectCheck);
Structure* currStructure = structure;
WriteBarrier<Structure>* it = chain->head();
JSObject* protoObject = 0;
for (unsigned i = 0; i < count; ++i, ++it) {
protoObject = asObject(currStructure->prototypeForLookup(callFrame));
currStructure = it->get();
testPrototype(protoObject, bucketsOfFail);
}
ASSERT(protoObject);
bool needsStubLink = false;
if (slot.cachedPropertyType() == PropertySlot::Getter) {
needsStubLink = true;
compileGetDirectOffset(protoObject, regT1, cachedOffset);
JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
stubCall.addArgument(regT1);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else if (slot.cachedPropertyType() == PropertySlot::Custom) {
needsStubLink = true;
JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
stubCall.addArgument(TrustedImmPtr(protoObject));
stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else
compileGetDirectOffset(protoObject, regT0, cachedOffset);
Jump success = jump();
LinkBuffer patchBuffer(this, m_codeBlock->executablePool(), 0);
if (needsStubLink) {
for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
if (iter->to)
patchBuffer.link(iter->from, FunctionPtr(iter->to));
}
}
// Use the patch information to link the failure cases back to the original slow case routine.
CodeLocationLabel lastProtoBegin = prototypeStructures->list[currentIndex - 1].stubRoutine;
patchBuffer.link(bucketsOfFail, lastProtoBegin);
// On success return back to the hot patch code, at a point it will perform the store to dest for us.
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
// Track the stub we have created so that it will be deleted later.
prototypeStructures->list[currentIndex].set(callFrame->globalData(), m_codeBlock->ownerExecutable(), entryLabel, structure, chain);
// Finally patch the jump to slow case back in the hot path to jump here instead.
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
RepatchBuffer repatchBuffer(m_codeBlock);
repatchBuffer.relink(jumpLocation, entryLabel);
}
void JIT::privateCompileGetByIdChain(StructureStubInfo* stubInfo, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame)
{
ASSERT(count);
JumpList bucketsOfFail;
// Check eax is an object of the right Structure.
bucketsOfFail.append(checkStructure(regT0, structure));
Structure* currStructure = structure;
WriteBarrier<Structure>* it = chain->head();
JSObject* protoObject = 0;
for (unsigned i = 0; i < count; ++i, ++it) {
protoObject = asObject(currStructure->prototypeForLookup(callFrame));
currStructure = it->get();
testPrototype(protoObject, bucketsOfFail);
}
ASSERT(protoObject);
bool needsStubLink = false;
if (slot.cachedPropertyType() == PropertySlot::Getter) {
needsStubLink = true;
compileGetDirectOffset(protoObject, regT1, cachedOffset);
JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
stubCall.addArgument(regT1);
stubCall.addArgument(regT0);
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else if (slot.cachedPropertyType() == PropertySlot::Custom) {
needsStubLink = true;
JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
stubCall.addArgument(TrustedImmPtr(protoObject));
stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
stubCall.call();
} else
compileGetDirectOffset(protoObject, regT0, cachedOffset);
Jump success = jump();
LinkBuffer patchBuffer(this, m_codeBlock->executablePool(), 0);
if (needsStubLink) {
for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
if (iter->to)
patchBuffer.link(iter->from, FunctionPtr(iter->to));
}
}
// Use the patch information to link the failure cases back to the original slow case routine.
patchBuffer.link(bucketsOfFail, stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall));
// On success return back to the hot patch code, at a point it will perform the store to dest for us.
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
// Track the stub we have created so that it will be deleted later.
CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
stubInfo->stubRoutine = entryLabel;
// Finally patch the jump to slow case back in the hot path to jump here instead.
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
RepatchBuffer repatchBuffer(m_codeBlock);
repatchBuffer.relink(jumpLocation, entryLabel);
// We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_proto_list));
}
/* ------------------------------ END: !ENABLE / ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS) ------------------------------ */
#endif // !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
} // namespace JSC
#endif // USE(JSVALUE64)
#endif // ENABLE(JIT)