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JITPropertyAccess.cpp
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1414 lines (1174 loc) · 50.8 KB
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/*
* 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)
#include "JIT.h"
#include "CodeBlock.h"
#include "GCAwareJITStubRoutine.h"
#include "GetterSetter.h"
#include "Interpreter.h"
#include "JITInlines.h"
#include "JSArray.h"
#include "JSFunction.h"
#include "JSPropertyNameIterator.h"
#include "JSVariableObject.h"
#include "LinkBuffer.h"
#include "RepatchBuffer.h"
#include "ResultType.h"
#include "SamplingTool.h"
#include <wtf/StringPrintStream.h>
namespace JSC {
#if USE(JSVALUE64)
JIT::CodeRef JIT::stringGetByValStubGenerator(VM* vm)
{
JSInterfaceJIT jit(vm);
JumpList failures;
failures.append(jit.branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(vm->stringStructure.get())));
// Load string length to regT2, 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);
failures.append(jit.branchTest32(Zero, 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
JumpList is16Bit;
JumpList cont8Bit;
// Load the string flags
jit.loadPtr(Address(regT0, StringImpl::flagsOffset()), regT2);
jit.loadPtr(Address(regT0, StringImpl::dataOffset()), regT0);
is16Bit.append(jit.branchTest32(Zero, regT2, TrustedImm32(StringImpl::flagIs8Bit())));
jit.load8(BaseIndex(regT0, regT1, TimesOne, 0), regT0);
cont8Bit.append(jit.jump());
is16Bit.link(&jit);
jit.load16(BaseIndex(regT0, regT1, TimesTwo, 0), regT0);
cont8Bit.link(&jit);
failures.append(jit.branch32(AboveOrEqual, regT0, TrustedImm32(0x100)));
jit.move(TrustedImmPtr(vm->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(*vm, &jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, ("String get_by_val stub"));
}
void JIT::emit_op_get_by_val(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
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);
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
emitArrayProfilingSite(regT2, regT3, profile);
and32(TrustedImm32(IndexingShapeMask), regT2);
PatchableJump badType;
JumpList slowCases;
JITArrayMode mode = chooseArrayMode(profile);
switch (mode) {
case JITInt32:
slowCases = emitInt32GetByVal(currentInstruction, badType);
break;
case JITDouble:
slowCases = emitDoubleGetByVal(currentInstruction, badType);
break;
case JITContiguous:
slowCases = emitContiguousGetByVal(currentInstruction, badType);
break;
case JITArrayStorage:
slowCases = emitArrayStorageGetByVal(currentInstruction, badType);
break;
default:
CRASH();
break;
}
addSlowCase(badType);
addSlowCase(slowCases);
Label done = label();
#if !ASSERT_DISABLED
Jump resultOK = branchTest64(NonZero, regT0);
breakpoint();
resultOK.link(this);
#endif
emitValueProfilingSite(regT4);
emitPutVirtualRegister(dst);
m_byValCompilationInfo.append(ByValCompilationInfo(m_bytecodeOffset, badType, mode, done));
}
JIT::JumpList JIT::emitDoubleGetByVal(Instruction*, PatchableJump& badType)
{
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(DoubleShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength())));
loadDouble(BaseIndex(regT2, regT1, TimesEight), fpRegT0);
slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
moveDoubleTo64(fpRegT0, regT0);
sub64(tagTypeNumberRegister, regT0);
return slowCases;
}
JIT::JumpList JIT::emitContiguousGetByVal(Instruction*, PatchableJump& badType, IndexingType expectedShape)
{
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(expectedShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength())));
load64(BaseIndex(regT2, regT1, TimesEight), regT0);
slowCases.append(branchTest64(Zero, regT0));
return slowCases;
}
JIT::JumpList JIT::emitArrayStorageGetByVal(Instruction*, PatchableJump& badType)
{
JumpList slowCases;
add32(TrustedImm32(-ArrayStorageShape), regT2, regT3);
badType = patchableBranch32(Above, regT3, TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, ArrayStorage::vectorLengthOffset())));
load64(BaseIndex(regT2, regT1, TimesEight, ArrayStorage::vectorOffset()), regT0);
slowCases.append(branchTest64(Zero, regT0));
return slowCases;
}
void JIT::emitSlow_op_get_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
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, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get()));
emitNakedCall(CodeLocationLabel(m_vm->getCTIStub(stringGetByValStubGenerator).code()));
Jump failed = branchTest64(Zero, regT0);
emitPutVirtualRegister(dst, regT0);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_get_by_val));
failed.link(this);
notString.link(this);
nonCell.link(this);
Jump skipProfiling = jump();
linkSlowCase(iter); // vector length check
linkSlowCase(iter); // empty value
emitArrayProfileOutOfBoundsSpecialCase(profile);
skipProfiling.link(this);
Label slowPath = label();
emitGetVirtualRegister(base, regT0);
emitGetVirtualRegister(property, regT1);
Call call = callOperation(operationGetByValDefault, dst, regT0, regT1);
m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
m_byValInstructionIndex++;
emitValueProfilingSite(regT4);
}
void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch, FinalObjectMode finalObjectMode)
{
ASSERT(sizeof(JSValue) == 8);
if (finalObjectMode == MayBeFinal) {
Jump isInline = branch32(LessThan, offset, TrustedImm32(firstOutOfLineOffset));
loadPtr(Address(base, JSObject::butterflyOffset()), scratch);
neg32(offset);
Jump done = jump();
isInline.link(this);
addPtr(TrustedImm32(JSObject::offsetOfInlineStorage() - (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), base, scratch);
done.link(this);
} else {
#if !ASSERT_DISABLED
Jump isOutOfLine = branch32(GreaterThanOrEqual, offset, TrustedImm32(firstOutOfLineOffset));
breakpoint();
isOutOfLine.link(this);
#endif
loadPtr(Address(base, JSObject::butterflyOffset()), scratch);
neg32(offset);
}
signExtend32ToPtr(offset, offset);
load64(BaseIndex(scratch, offset, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), result);
}
void JIT::emit_op_get_by_pname(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
unsigned expected = currentInstruction[4].u.operand;
int iter = currentInstruction[5].u.operand;
int i = currentInstruction[6].u.operand;
emitGetVirtualRegister(property, regT0);
addSlowCase(branch64(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))));
Jump inlineProperty = branch32(Below, regT3, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructureInlineCapacity)));
add32(TrustedImm32(firstOutOfLineOffset), regT3);
sub32(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructureInlineCapacity)), regT3);
inlineProperty.link(this);
compileGetDirectOffset(regT0, regT0, regT3, regT1);
emitPutVirtualRegister(dst, regT0);
}
void JIT::emitSlow_op_get_by_pname(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
linkSlowCase(iter);
linkSlowCaseIfNotJSCell(iter, base);
linkSlowCase(iter);
linkSlowCase(iter);
emitGetVirtualRegister(base, regT0);
emitGetVirtualRegister(property, regT1);
callOperation(operationGetByValGeneric, dst, regT0, regT1);
}
void JIT::emit_op_put_by_val(Instruction* currentInstruction)
{
int base = currentInstruction[1].u.operand;
int property = currentInstruction[2].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
emitGetVirtualRegisters(base, regT0, property, regT1);
emitJumpSlowCaseIfNotImmediateInteger(regT1);
// See comment in op_get_by_val.
zeroExtend32ToPtr(regT1, regT1);
emitJumpSlowCaseIfNotJSCell(regT0, base);
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
emitArrayProfilingSite(regT2, regT3, profile);
and32(TrustedImm32(IndexingShapeMask), regT2);
PatchableJump badType;
JumpList slowCases;
JITArrayMode mode = chooseArrayMode(profile);
switch (mode) {
case JITInt32:
slowCases = emitInt32PutByVal(currentInstruction, badType);
break;
case JITDouble:
slowCases = emitDoublePutByVal(currentInstruction, badType);
break;
case JITContiguous:
slowCases = emitContiguousPutByVal(currentInstruction, badType);
break;
case JITArrayStorage:
slowCases = emitArrayStoragePutByVal(currentInstruction, badType);
break;
default:
CRASH();
break;
}
addSlowCase(badType);
addSlowCase(slowCases);
Label done = label();
m_byValCompilationInfo.append(ByValCompilationInfo(m_bytecodeOffset, badType, mode, done));
}
JIT::JumpList JIT::emitGenericContiguousPutByVal(Instruction* currentInstruction, PatchableJump& badType, IndexingType indexingShape)
{
int value = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(indexingShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
Jump outOfBounds = branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength()));
Label storeResult = label();
emitGetVirtualRegister(value, regT3);
switch (indexingShape) {
case Int32Shape:
slowCases.append(emitJumpIfNotImmediateInteger(regT3));
store64(regT3, BaseIndex(regT2, regT1, TimesEight));
break;
case DoubleShape: {
Jump notInt = emitJumpIfNotImmediateInteger(regT3);
convertInt32ToDouble(regT3, fpRegT0);
Jump ready = jump();
notInt.link(this);
add64(tagTypeNumberRegister, regT3);
move64ToDouble(regT3, fpRegT0);
slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
ready.link(this);
storeDouble(fpRegT0, BaseIndex(regT2, regT1, TimesEight));
break;
}
case ContiguousShape:
store64(regT3, BaseIndex(regT2, regT1, TimesEight));
emitWriteBarrier(currentInstruction[1].u.operand, value, ShouldFilterValue);
break;
default:
CRASH();
break;
}
Jump done = jump();
outOfBounds.link(this);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfVectorLength())));
emitArrayProfileStoreToHoleSpecialCase(profile);
add32(TrustedImm32(1), regT1, regT3);
store32(regT3, Address(regT2, Butterfly::offsetOfPublicLength()));
jump().linkTo(storeResult, this);
done.link(this);
return slowCases;
}
JIT::JumpList JIT::emitArrayStoragePutByVal(Instruction* currentInstruction, PatchableJump& badType)
{
int value = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
JumpList slowCases;
badType = patchableBranch32(NotEqual, regT2, TrustedImm32(ArrayStorageShape));
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, ArrayStorage::vectorLengthOffset())));
Jump empty = branchTest64(Zero, BaseIndex(regT2, regT1, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
Label storeResult(this);
emitGetVirtualRegister(value, regT3);
store64(regT3, BaseIndex(regT2, regT1, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
emitWriteBarrier(currentInstruction[1].u.operand, value, ShouldFilterValue);
Jump end = jump();
empty.link(this);
emitArrayProfileStoreToHoleSpecialCase(profile);
add32(TrustedImm32(1), Address(regT2, ArrayStorage::numValuesInVectorOffset()));
branch32(Below, regT1, Address(regT2, ArrayStorage::lengthOffset())).linkTo(storeResult, this);
add32(TrustedImm32(1), regT1);
store32(regT1, Address(regT2, ArrayStorage::lengthOffset()));
sub32(TrustedImm32(1), regT1);
jump().linkTo(storeResult, this);
end.link(this);
return slowCases;
}
void JIT::emitSlow_op_put_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int base = currentInstruction[1].u.operand;
int property = currentInstruction[2].u.operand;
int value = currentInstruction[3].u.operand;
ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
linkSlowCase(iter); // property int32 check
linkSlowCaseIfNotJSCell(iter, base); // base cell check
linkSlowCase(iter); // base not array check
JITArrayMode mode = chooseArrayMode(profile);
switch (mode) {
case JITInt32:
case JITDouble:
linkSlowCase(iter); // value type check
break;
default:
break;
}
Jump skipProfiling = jump();
linkSlowCase(iter); // out of bounds
emitArrayProfileOutOfBoundsSpecialCase(profile);
skipProfiling.link(this);
Label slowPath = label();
emitGetVirtualRegister(property, regT1);
emitGetVirtualRegister(value, regT2);
bool isDirect = m_interpreter->getOpcodeID(currentInstruction->u.opcode) == op_put_by_val_direct;
Call call = callOperation(isDirect ? operationDirectPutByVal : operationPutByVal, regT0, regT1, regT2);
m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
m_byValInstructionIndex++;
}
void JIT::emit_op_put_by_index(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
callOperation(operationPutByIndex, regT0, currentInstruction[2].u.operand, regT1);
}
void JIT::emit_op_put_getter_setter(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
emitGetVirtualRegister(currentInstruction[4].u.operand, regT2);
callOperation(operationPutGetterSetter, regT0, &m_codeBlock->identifier(currentInstruction[2].u.operand), regT1, regT2);
}
void JIT::emit_op_del_by_id(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
emitGetVirtualRegister(base, regT0);
callOperation(operationDeleteById, dst, regT0, &m_codeBlock->identifier(property));
}
void JIT::emit_op_get_by_id(Instruction* currentInstruction)
{
int resultVReg = currentInstruction[1].u.operand;
int baseVReg = currentInstruction[2].u.operand;
const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
emitGetVirtualRegister(baseVReg, regT0);
emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
if (*ident == m_vm->propertyNames->length && shouldEmitProfiling()) {
loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
emitArrayProfilingSiteForBytecodeIndex(regT1, regT2, m_bytecodeOffset);
}
JITGetByIdGenerator gen(
m_codeBlock, CodeOrigin(m_bytecodeOffset), RegisterSet::specialRegisters(),
callFrameRegister, JSValueRegs(regT0), JSValueRegs(regT0), true);
gen.generateFastPath(*this);
addSlowCase(gen.slowPathJump());
m_getByIds.append(gen);
emitValueProfilingSite(regT4);
emitPutVirtualRegister(resultVReg);
}
void JIT::emitSlow_op_get_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int resultVReg = currentInstruction[1].u.operand;
int baseVReg = currentInstruction[2].u.operand;
const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++];
Label coldPathBegin = label();
Call call = callOperation(WithProfile, operationGetByIdOptimize, resultVReg, gen.stubInfo(), regT0, ident->impl());
gen.reportSlowPathCall(coldPathBegin, call);
}
void JIT::emit_op_put_by_id(Instruction* currentInstruction)
{
int baseVReg = currentInstruction[1].u.operand;
int valueVReg = currentInstruction[3].u.operand;
unsigned direct = currentInstruction[8].u.operand;
emitWriteBarrier(baseVReg, valueVReg, ShouldFilterBaseAndValue);
// 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);
JITPutByIdGenerator gen(
m_codeBlock, CodeOrigin(m_bytecodeOffset), RegisterSet::specialRegisters(),
callFrameRegister, JSValueRegs(regT0), JSValueRegs(regT1), regT2, true,
m_codeBlock->ecmaMode(), direct ? Direct : NotDirect);
gen.generateFastPath(*this);
addSlowCase(gen.slowPathJump());
m_putByIds.append(gen);
}
void JIT::emitSlow_op_put_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int baseVReg = currentInstruction[1].u.operand;
const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[2].u.operand));
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
Label coldPathBegin(this);
JITPutByIdGenerator& gen = m_putByIds[m_putByIdIndex++];
Call call = callOperation(
gen.slowPathFunction(), gen.stubInfo(), regT1, regT0, ident->impl());
gen.reportSlowPathCall(coldPathBegin, call);
}
// Compile a store into an object's property storage. May overwrite the
// value in objectReg.
void JIT::compilePutDirectOffset(RegisterID base, RegisterID value, PropertyOffset cachedOffset)
{
if (isInlineOffset(cachedOffset)) {
store64(value, Address(base, JSObject::offsetOfInlineStorage() + sizeof(JSValue) * offsetInInlineStorage(cachedOffset)));
return;
}
loadPtr(Address(base, JSObject::butterflyOffset()), base);
store64(value, Address(base, sizeof(JSValue) * offsetInButterfly(cachedOffset)));
}
// Compile a load from an object's property storage. May overwrite base.
void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, PropertyOffset cachedOffset)
{
if (isInlineOffset(cachedOffset)) {
load64(Address(base, JSObject::offsetOfInlineStorage() + sizeof(JSValue) * offsetInInlineStorage(cachedOffset)), result);
return;
}
loadPtr(Address(base, JSObject::butterflyOffset()), result);
load64(Address(result, sizeof(JSValue) * offsetInButterfly(cachedOffset)), result);
}
void JIT::compileGetDirectOffset(JSObject* base, RegisterID result, PropertyOffset cachedOffset)
{
if (isInlineOffset(cachedOffset)) {
load64(base->locationForOffset(cachedOffset), result);
return;
}
loadPtr(base->butterflyAddress(), result);
load64(Address(result, offsetInButterfly(cachedOffset) * sizeof(WriteBarrier<Unknown>)), result);
}
void JIT::emitVarInjectionCheck(bool needsVarInjectionChecks)
{
if (!needsVarInjectionChecks)
return;
addSlowCase(branch8(Equal, AbsoluteAddress(m_codeBlock->globalObject()->varInjectionWatchpoint()->addressOfState()), TrustedImm32(IsInvalidated)));
}
void JIT::emitResolveClosure(int dst, bool needsVarInjectionChecks, unsigned depth)
{
emitVarInjectionCheck(needsVarInjectionChecks);
emitGetVirtualRegister(JSStack::ScopeChain, regT0);
if (m_codeBlock->needsActivation()) {
emitGetVirtualRegister(m_codeBlock->activationRegister(), regT1);
Jump noActivation = branchTestPtr(Zero, regT1);
loadPtr(Address(regT0, JSScope::offsetOfNext()), regT0);
noActivation.link(this);
}
for (unsigned i = 0; i < depth; ++i)
loadPtr(Address(regT0, JSScope::offsetOfNext()), regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_resolve_scope(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
ResolveType resolveType = static_cast<ResolveType>(currentInstruction[3].u.operand);
unsigned depth = currentInstruction[4].u.operand;
switch (resolveType) {
case GlobalProperty:
case GlobalVar:
case GlobalPropertyWithVarInjectionChecks:
case GlobalVarWithVarInjectionChecks:
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
emitPutVirtualRegister(dst);
break;
case ClosureVar:
case ClosureVarWithVarInjectionChecks:
emitResolveClosure(dst, needsVarInjectionChecks(resolveType), depth);
break;
case Dynamic:
addSlowCase(jump());
break;
}
}
void JIT::emitSlow_op_resolve_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
ResolveType resolveType = static_cast<ResolveType>(currentInstruction[3].u.operand);
if (resolveType == GlobalProperty || resolveType == GlobalVar || resolveType == ClosureVar)
return;
linkSlowCase(iter);
int32_t indentifierIndex = currentInstruction[2].u.operand;
callOperation(operationResolveScope, dst, indentifierIndex);
}
void JIT::emitLoadWithStructureCheck(int scope, Structure** structureSlot)
{
emitGetVirtualRegister(scope, regT0);
loadPtr(structureSlot, regT1);
addSlowCase(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), regT1));
}
void JIT::emitGetGlobalProperty(uintptr_t* operandSlot)
{
load32(operandSlot, regT1);
compileGetDirectOffset(regT0, regT0, regT1, regT2, KnownNotFinal);
}
void JIT::emitGetGlobalVar(uintptr_t operand)
{
loadPtr(reinterpret_cast<void*>(operand), regT0);
}
void JIT::emitGetClosureVar(int scope, uintptr_t operand)
{
emitGetVirtualRegister(scope, regT0);
loadPtr(Address(regT0, JSVariableObject::offsetOfRegisters()), regT0);
loadPtr(Address(regT0, operand * sizeof(Register)), regT0);
}
void JIT::emit_op_get_from_scope(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int scope = currentInstruction[2].u.operand;
ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
Structure** structureSlot = currentInstruction[5].u.structure.slot();
uintptr_t* operandSlot = reinterpret_cast<uintptr_t*>(¤tInstruction[6].u.pointer);
switch (resolveType) {
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks:
emitLoadWithStructureCheck(scope, structureSlot); // Structure check covers var injection.
emitGetGlobalProperty(operandSlot);
break;
case GlobalVar:
case GlobalVarWithVarInjectionChecks:
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
emitGetGlobalVar(*operandSlot);
break;
case ClosureVar:
case ClosureVarWithVarInjectionChecks:
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
emitGetClosureVar(scope, *operandSlot);
break;
case Dynamic:
addSlowCase(jump());
break;
}
emitPutVirtualRegister(dst);
emitValueProfilingSite(regT4);
}
void JIT::emitSlow_op_get_from_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
if (resolveType == GlobalVar || resolveType == ClosureVar)
return;
linkSlowCase(iter);
callOperation(WithProfile, operationGetFromScope, dst, currentInstruction);
}
void JIT::emitPutGlobalProperty(uintptr_t* operandSlot, int value)
{
emitGetVirtualRegister(value, regT2);
loadPtr(Address(regT0, JSObject::butterflyOffset()), regT0);
loadPtr(operandSlot, regT1);
negPtr(regT1);
storePtr(regT2, BaseIndex(regT0, regT1, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)));
}
void JIT::emitNotifyWrite(RegisterID value, RegisterID scratch, VariableWatchpointSet* set)
{
if (!set || set->state() == IsInvalidated)
return;
load8(set->addressOfState(), scratch);
JumpList ready;
ready.append(branch32(Equal, scratch, TrustedImm32(IsInvalidated)));
if (set->state() == ClearWatchpoint) {
Jump isWatched = branch32(NotEqual, scratch, TrustedImm32(ClearWatchpoint));
store64(value, set->addressOfInferredValue());
store8(TrustedImm32(IsWatched), set->addressOfState());
ready.append(jump());
isWatched.link(this);
}
ready.append(branch64(Equal, AbsoluteAddress(set->addressOfInferredValue()), value));
addSlowCase(branchTest8(NonZero, AbsoluteAddress(set->addressOfSetIsNotEmpty())));
store8(TrustedImm32(IsInvalidated), set->addressOfState());
move(TrustedImm64(JSValue::encode(JSValue())), scratch);
store64(scratch, set->addressOfInferredValue());
ready.link(this);
}
void JIT::emitPutGlobalVar(uintptr_t operand, int value, VariableWatchpointSet* set)
{
emitGetVirtualRegister(value, regT0);
emitNotifyWrite(regT0, regT1, set);
storePtr(regT0, reinterpret_cast<void*>(operand));
}
void JIT::emitPutClosureVar(int scope, uintptr_t operand, int value)
{
emitGetVirtualRegister(value, regT1);
emitGetVirtualRegister(scope, regT0);
loadPtr(Address(regT0, JSVariableObject::offsetOfRegisters()), regT0);
storePtr(regT1, Address(regT0, operand * sizeof(Register)));
}
void JIT::emit_op_put_to_scope(Instruction* currentInstruction)
{
int scope = currentInstruction[1].u.operand;
int value = currentInstruction[3].u.operand;
ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
Structure** structureSlot = currentInstruction[5].u.structure.slot();
uintptr_t* operandSlot = reinterpret_cast<uintptr_t*>(¤tInstruction[6].u.pointer);
switch (resolveType) {
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks:
emitWriteBarrier(m_codeBlock->globalObject(), value, ShouldFilterValue);
emitLoadWithStructureCheck(scope, structureSlot); // Structure check covers var injection.
emitPutGlobalProperty(operandSlot, value);
break;
case GlobalVar:
case GlobalVarWithVarInjectionChecks:
emitWriteBarrier(m_codeBlock->globalObject(), value, ShouldFilterValue);
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
emitPutGlobalVar(*operandSlot, value, currentInstruction[5].u.watchpointSet);
break;
case ClosureVar:
case ClosureVarWithVarInjectionChecks:
emitWriteBarrier(scope, value, ShouldFilterValue);
emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
emitPutClosureVar(scope, *operandSlot, value);
break;
case Dynamic:
addSlowCase(jump());
break;
}
}
void JIT::emitSlow_op_put_to_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
unsigned linkCount = 0;
if (resolveType != GlobalVar && resolveType != ClosureVar)
linkCount++;
if ((resolveType == GlobalVar || resolveType == GlobalVarWithVarInjectionChecks)
&& currentInstruction[5].u.watchpointSet->state() != IsInvalidated)
linkCount++;
if (!linkCount)
return;
while (linkCount--)
linkSlowCase(iter);
callOperation(operationPutToScope, currentInstruction);
}
void JIT::emit_op_init_global_const(Instruction* currentInstruction)
{
JSGlobalObject* globalObject = m_codeBlock->globalObject();
emitWriteBarrier(globalObject, currentInstruction[2].u.operand, ShouldFilterValue);
emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
store64(regT0, currentInstruction[1].u.registerPointer);
}
#endif // USE(JSVALUE64)
JIT::Jump JIT::checkMarkWord(RegisterID owner, RegisterID scratch1, RegisterID scratch2)
{
move(owner, scratch1);
move(owner, scratch2);
andPtr(TrustedImmPtr(MarkedBlock::blockMask), scratch1);
andPtr(TrustedImmPtr(~MarkedBlock::blockMask), scratch2);
rshift32(TrustedImm32(3 + 4), scratch2);
return branchTest8(Zero, BaseIndex(scratch1, scratch2, TimesOne, MarkedBlock::offsetOfMarks()));
}
JIT::Jump JIT::checkMarkWord(JSCell* owner)
{
MarkedBlock* block = MarkedBlock::blockFor(owner);
size_t index = (reinterpret_cast<size_t>(owner) & ~MarkedBlock::blockMask) >> (3 + 4);
void* address = (reinterpret_cast<char*>(block) + MarkedBlock::offsetOfMarks()) + index;
return branchTest8(Zero, AbsoluteAddress(address));
}
#if USE(JSVALUE64)
void JIT::emitWriteBarrier(unsigned owner, unsigned value, WriteBarrierMode mode)
{
#if ENABLE(GGC)
emitGetVirtualRegister(value, regT0);
Jump valueNotCell;
if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue)
valueNotCell = branchTest64(NonZero, regT0, tagMaskRegister);
emitGetVirtualRegister(owner, regT0);
Jump ownerNotCell;
if (mode == ShouldFilterBaseAndValue)
ownerNotCell = branchTest64(NonZero, regT0, tagMaskRegister);
Jump ownerNotMarked = checkMarkWord(regT0, regT1, regT2);
callOperation(operationUnconditionalWriteBarrier, regT0);
ownerNotMarked.link(this);
if (mode == ShouldFilterBaseAndValue)
ownerNotCell.link(this);
if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue)
valueNotCell.link(this);
#else
UNUSED_PARAM(owner);
UNUSED_PARAM(value);
UNUSED_PARAM(mode);
#endif
}
void JIT::emitWriteBarrier(JSCell* owner, unsigned value, WriteBarrierMode mode)
{
#if ENABLE(GGC)
emitGetVirtualRegister(value, regT0);
Jump valueNotCell;
if (mode == ShouldFilterValue)
valueNotCell = branchTest64(NonZero, regT0, tagMaskRegister);
if (!MarkedBlock::blockFor(owner)->isMarked(owner)) {
Jump ownerNotMarked = checkMarkWord(regT0, regT1, regT2);
callOperation(operationUnconditionalWriteBarrier, owner);
ownerNotMarked.link(this);
} else
callOperation(operationUnconditionalWriteBarrier, owner);
if (mode == ShouldFilterValue)
valueNotCell.link(this);
#else
UNUSED_PARAM(owner);
UNUSED_PARAM(value);
UNUSED_PARAM(mode);
#endif
}
#else // USE(JSVALUE64)
void JIT::emitWriteBarrier(unsigned owner, unsigned value, WriteBarrierMode mode)
{
#if ENABLE(GGC)
emitLoadTag(value, regT0);
Jump valueNotCell;
if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue)
valueNotCell = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
emitLoad(owner, regT0, regT1);
Jump ownerNotCell;
if (mode == ShouldFilterBaseAndValue)
ownerNotCell = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
Jump ownerNotMarked = checkMarkWord(regT1, regT0, regT2);
callOperation(operationUnconditionalWriteBarrier, regT1);
ownerNotMarked.link(this);
if (mode == ShouldFilterBaseAndValue)
ownerNotCell.link(this);
if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue)
valueNotCell.link(this);
#else
UNUSED_PARAM(owner);
UNUSED_PARAM(value);
UNUSED_PARAM(mode);
#endif
}
void JIT::emitWriteBarrier(JSCell* owner, unsigned value, WriteBarrierMode mode)
{
#if ENABLE(GGC)
emitLoadTag(value, regT0);
Jump valueNotCell;
if (mode == ShouldFilterValue)
valueNotCell = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
if (!MarkedBlock::blockFor(owner)->isMarked(owner)) {
Jump ownerNotMarked = checkMarkWord(regT0, regT1, regT2);
callOperation(operationUnconditionalWriteBarrier, owner);
ownerNotMarked.link(this);
} else
callOperation(operationUnconditionalWriteBarrier, owner);
if (mode == ShouldFilterValue)
valueNotCell.link(this);
#else
UNUSED_PARAM(owner);
UNUSED_PARAM(value);
UNUSED_PARAM(mode);