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AssemblyHelpers.h
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2061 lines (1802 loc) · 70.4 KB
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/*
* Copyright (C) 2011-2020 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.
*/
#pragma once
#if ENABLE(JIT)
#include "CodeBlock.h"
#include "EntryFrame.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "Heap.h"
#include "InlineCallFrame.h"
#include "JITAllocator.h"
#include "JITCode.h"
#include "JSCellInlines.h"
#include "MacroAssembler.h"
#include "MarkedSpace.h"
#include "RegisterAtOffsetList.h"
#include "RegisterSet.h"
#include "StackAlignment.h"
#include "TagRegistersMode.h"
#include "TypeofType.h"
#include "VM.h"
namespace JSC {
typedef void (*V_DebugOperation_EPP)(CallFrame*, void*, void*);
class AssemblyHelpers : public MacroAssembler {
public:
AssemblyHelpers(CodeBlock* codeBlock)
: m_codeBlock(codeBlock)
, m_baselineCodeBlock(codeBlock ? codeBlock->baselineAlternative() : nullptr)
{
if (m_codeBlock) {
ASSERT(m_baselineCodeBlock);
ASSERT(!m_baselineCodeBlock->alternative());
ASSERT(m_baselineCodeBlock->jitType() == JITType::None || JITCode::isBaselineCode(m_baselineCodeBlock->jitType()));
}
}
CodeBlock* codeBlock() { return m_codeBlock; }
VM& vm() { return m_codeBlock->vm(); }
AssemblerType_T& assembler() { return m_assembler; }
void prepareCallOperation(VM& vm)
{
UNUSED_PARAM(vm);
#if !USE(BUILTIN_FRAME_ADDRESS) || ASSERT_ENABLED
storePtr(GPRInfo::callFrameRegister, &vm.topCallFrame);
#endif
}
void checkStackPointerAlignment()
{
// This check is both unneeded and harder to write correctly for ARM64
#if !defined(NDEBUG) && !CPU(ARM64)
Jump stackPointerAligned = branchTestPtr(Zero, stackPointerRegister, TrustedImm32(0xf));
abortWithReason(AHStackPointerMisaligned);
stackPointerAligned.link(this);
#endif
}
#if USE(JSVALUE64)
void store64FromReg(Reg src, Address dst)
{
if (src.isFPR())
storeDouble(src.fpr(), dst);
else
store64(src.gpr(), dst);
}
#endif
void store32FromReg(Reg src, Address dst)
{
if (src.isFPR())
storeFloat(src.fpr(), dst);
else
store32(src.gpr(), dst);
}
void storeReg(Reg src, Address dst)
{
#if USE(JSVALUE64)
store64FromReg(src, dst);
#else
store32FromReg(src, dst);
#endif
}
#if USE(JSVALUE64)
void load64ToReg(Address src, Reg dst)
{
if (dst.isFPR())
loadDouble(src, dst.fpr());
else
load64(src, dst.gpr());
}
#endif
void load32ToReg(Address src, Reg dst)
{
if (dst.isFPR())
loadFloat(src, dst.fpr());
else
load32(src, dst.gpr());
}
void loadReg(Address src, Reg dst)
{
#if USE(JSVALUE64)
load64ToReg(src, dst);
#else
load32ToReg(src, dst);
#endif
}
template<typename T>
void storeCell(T cell, Address address)
{
#if USE(JSVALUE64)
store64(cell, address);
#else
store32(cell, address.withOffset(PayloadOffset));
store32(TrustedImm32(JSValue::CellTag), address.withOffset(TagOffset));
#endif
}
void loadCell(Address address, GPRReg gpr)
{
#if USE(JSVALUE64)
load64(address, gpr);
#else
load32(address.withOffset(PayloadOffset), gpr);
#endif
}
void storeValue(JSValueRegs regs, Address address)
{
#if USE(JSVALUE64)
store64(regs.gpr(), address);
#else
store32(regs.payloadGPR(), address.withOffset(PayloadOffset));
store32(regs.tagGPR(), address.withOffset(TagOffset));
#endif
}
void storeValue(JSValueRegs regs, BaseIndex address)
{
#if USE(JSVALUE64)
store64(regs.gpr(), address);
#else
store32(regs.payloadGPR(), address.withOffset(PayloadOffset));
store32(regs.tagGPR(), address.withOffset(TagOffset));
#endif
}
void storeValue(JSValueRegs regs, void* address)
{
#if USE(JSVALUE64)
store64(regs.gpr(), address);
#else
store32(regs.payloadGPR(), bitwise_cast<void*>(bitwise_cast<uintptr_t>(address) + PayloadOffset));
store32(regs.tagGPR(), bitwise_cast<void*>(bitwise_cast<uintptr_t>(address) + TagOffset));
#endif
}
void loadValue(Address address, JSValueRegs regs)
{
#if USE(JSVALUE64)
load64(address, regs.gpr());
#else
if (address.base == regs.payloadGPR()) {
load32(address.withOffset(TagOffset), regs.tagGPR());
load32(address.withOffset(PayloadOffset), regs.payloadGPR());
} else {
load32(address.withOffset(PayloadOffset), regs.payloadGPR());
load32(address.withOffset(TagOffset), regs.tagGPR());
}
#endif
}
void loadValue(BaseIndex address, JSValueRegs regs)
{
#if USE(JSVALUE64)
load64(address, regs.gpr());
#else
if (address.base == regs.payloadGPR() || address.index == regs.payloadGPR()) {
// We actually could handle the case where the registers are aliased to both
// tag and payload, but we don't for now.
RELEASE_ASSERT(address.base != regs.tagGPR());
RELEASE_ASSERT(address.index != regs.tagGPR());
load32(address.withOffset(TagOffset), regs.tagGPR());
load32(address.withOffset(PayloadOffset), regs.payloadGPR());
} else {
load32(address.withOffset(PayloadOffset), regs.payloadGPR());
load32(address.withOffset(TagOffset), regs.tagGPR());
}
#endif
}
void loadValue(void* address, JSValueRegs regs)
{
#if USE(JSVALUE64)
load64(address, regs.gpr());
#else
move(TrustedImmPtr(address), regs.payloadGPR());
loadValue(Address(regs.payloadGPR()), regs);
#endif
}
// Note that this clobbers offset.
void loadProperty(GPRReg object, GPRReg offset, JSValueRegs result);
void moveValueRegs(JSValueRegs srcRegs, JSValueRegs destRegs)
{
#if USE(JSVALUE32_64)
if (destRegs.tagGPR() == srcRegs.payloadGPR()) {
if (destRegs.payloadGPR() == srcRegs.tagGPR()) {
swap(srcRegs.payloadGPR(), srcRegs.tagGPR());
return;
}
move(srcRegs.payloadGPR(), destRegs.payloadGPR());
move(srcRegs.tagGPR(), destRegs.tagGPR());
return;
}
move(srcRegs.tagGPR(), destRegs.tagGPR());
move(srcRegs.payloadGPR(), destRegs.payloadGPR());
#else
move(srcRegs.gpr(), destRegs.gpr());
#endif
}
void moveValue(JSValue value, JSValueRegs regs)
{
#if USE(JSVALUE64)
move(Imm64(JSValue::encode(value)), regs.gpr());
#else
move(Imm32(value.tag()), regs.tagGPR());
move(Imm32(value.payload()), regs.payloadGPR());
#endif
}
void moveTrustedValue(JSValue value, JSValueRegs regs)
{
#if USE(JSVALUE64)
move(TrustedImm64(JSValue::encode(value)), regs.gpr());
#else
move(TrustedImm32(value.tag()), regs.tagGPR());
move(TrustedImm32(value.payload()), regs.payloadGPR());
#endif
}
void storeTrustedValue(JSValue value, Address address)
{
#if USE(JSVALUE64)
store64(TrustedImm64(JSValue::encode(value)), address);
#else
store32(TrustedImm32(value.tag()), address.withOffset(TagOffset));
store32(TrustedImm32(value.payload()), address.withOffset(PayloadOffset));
#endif
}
void storeTrustedValue(JSValue value, BaseIndex address)
{
#if USE(JSVALUE64)
store64(TrustedImm64(JSValue::encode(value)), address);
#else
store32(TrustedImm32(value.tag()), address.withOffset(TagOffset));
store32(TrustedImm32(value.payload()), address.withOffset(PayloadOffset));
#endif
}
Address addressFor(const RegisterAtOffset& entry)
{
return Address(GPRInfo::callFrameRegister, entry.offset());
}
void emitSave(const RegisterAtOffsetList& list)
{
for (const RegisterAtOffset& entry : list) {
if (entry.reg().isGPR())
storePtr(entry.reg().gpr(), addressFor(entry));
else
storeDouble(entry.reg().fpr(), addressFor(entry));
}
}
void emitRestore(const RegisterAtOffsetList& list)
{
for (const RegisterAtOffset& entry : list) {
if (entry.reg().isGPR())
loadPtr(addressFor(entry), entry.reg().gpr());
else
loadDouble(addressFor(entry), entry.reg().fpr());
}
}
void emitSaveCalleeSavesFor(CodeBlock* codeBlock)
{
ASSERT(codeBlock);
const RegisterAtOffsetList* calleeSaves = codeBlock->calleeSaveRegisters();
RegisterSet dontSaveRegisters = RegisterSet(RegisterSet::stackRegisters(), RegisterSet::allFPRs());
unsigned registerCount = calleeSaves->size();
for (unsigned i = 0; i < registerCount; i++) {
RegisterAtOffset entry = calleeSaves->at(i);
if (dontSaveRegisters.get(entry.reg()))
continue;
storePtr(entry.reg().gpr(), Address(framePointerRegister, entry.offset()));
}
}
enum RestoreTagRegisterMode { UseExistingTagRegisterContents, CopyBaselineCalleeSavedRegistersFromBaseFrame };
void emitSaveOrCopyCalleeSavesFor(CodeBlock* codeBlock, VirtualRegister offsetVirtualRegister, RestoreTagRegisterMode tagRegisterMode, GPRReg temp)
{
ASSERT(codeBlock);
const RegisterAtOffsetList* calleeSaves = codeBlock->calleeSaveRegisters();
RegisterSet dontSaveRegisters = RegisterSet(RegisterSet::stackRegisters(), RegisterSet::allFPRs());
unsigned registerCount = calleeSaves->size();
#if USE(JSVALUE64)
RegisterSet baselineCalleeSaves = RegisterSet::llintBaselineCalleeSaveRegisters();
#endif
for (unsigned i = 0; i < registerCount; i++) {
RegisterAtOffset entry = calleeSaves->at(i);
if (dontSaveRegisters.get(entry.reg()))
continue;
GPRReg registerToWrite;
#if USE(JSVALUE32_64)
UNUSED_PARAM(tagRegisterMode);
UNUSED_PARAM(temp);
#else
if (tagRegisterMode == CopyBaselineCalleeSavedRegistersFromBaseFrame && baselineCalleeSaves.get(entry.reg())) {
registerToWrite = temp;
loadPtr(AssemblyHelpers::Address(GPRInfo::callFrameRegister, entry.offset()), registerToWrite);
} else
#endif
registerToWrite = entry.reg().gpr();
storePtr(registerToWrite, Address(framePointerRegister, offsetVirtualRegister.offsetInBytes() + entry.offset()));
}
}
void emitRestoreCalleeSavesFor(CodeBlock* codeBlock)
{
ASSERT(codeBlock);
const RegisterAtOffsetList* calleeSaves = codeBlock->calleeSaveRegisters();
RegisterSet dontRestoreRegisters = RegisterSet(RegisterSet::stackRegisters(), RegisterSet::allFPRs());
unsigned registerCount = calleeSaves->size();
for (unsigned i = 0; i < registerCount; i++) {
RegisterAtOffset entry = calleeSaves->at(i);
if (dontRestoreRegisters.get(entry.reg()))
continue;
loadPtr(Address(framePointerRegister, entry.offset()), entry.reg().gpr());
}
}
void emitSaveCalleeSaves()
{
emitSaveCalleeSavesFor(codeBlock());
}
void emitSaveThenMaterializeTagRegisters()
{
#if USE(JSVALUE64)
#if CPU(ARM64)
pushPair(GPRInfo::numberTagRegister, GPRInfo::notCellMaskRegister);
#else
push(GPRInfo::numberTagRegister);
push(GPRInfo::notCellMaskRegister);
#endif
emitMaterializeTagCheckRegisters();
#endif
}
void emitRestoreCalleeSaves()
{
emitRestoreCalleeSavesFor(codeBlock());
}
void emitRestoreSavedTagRegisters()
{
#if USE(JSVALUE64)
#if CPU(ARM64)
popPair(GPRInfo::numberTagRegister, GPRInfo::notCellMaskRegister);
#else
pop(GPRInfo::notCellMaskRegister);
pop(GPRInfo::numberTagRegister);
#endif
#endif
}
// If you use this, be aware that vmGPR will get trashed.
void copyCalleeSavesToVMEntryFrameCalleeSavesBuffer(GPRReg vmGPR)
{
#if NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
loadPtr(Address(vmGPR, VM::topEntryFrameOffset()), vmGPR);
copyCalleeSavesToEntryFrameCalleeSavesBufferImpl(vmGPR);
#else
UNUSED_PARAM(vmGPR);
#endif
}
void copyCalleeSavesToEntryFrameCalleeSavesBuffer(EntryFrame*& topEntryFrame)
{
#if NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
const TempRegisterSet& usedRegisters = { RegisterSet::stubUnavailableRegisters() };
GPRReg temp1 = usedRegisters.getFreeGPR(0);
loadPtr(&topEntryFrame, temp1);
copyCalleeSavesToEntryFrameCalleeSavesBufferImpl(temp1);
#else
UNUSED_PARAM(topEntryFrame);
#endif
}
void copyCalleeSavesToEntryFrameCalleeSavesBuffer(GPRReg topEntryFrame)
{
#if NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
copyCalleeSavesToEntryFrameCalleeSavesBufferImpl(topEntryFrame);
#else
UNUSED_PARAM(topEntryFrame);
#endif
}
void restoreCalleeSavesFromEntryFrameCalleeSavesBuffer(EntryFrame*&);
void copyCalleeSavesFromFrameOrRegisterToEntryFrameCalleeSavesBuffer(EntryFrame*& topEntryFrame, const TempRegisterSet& usedRegisters = { RegisterSet::stubUnavailableRegisters() })
{
#if NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
GPRReg temp1 = usedRegisters.getFreeGPR(0);
GPRReg temp2 = usedRegisters.getFreeGPR(1);
FPRReg fpTemp = usedRegisters.getFreeFPR();
ASSERT(temp2 != InvalidGPRReg);
ASSERT(codeBlock());
// Copy saved calleeSaves on stack or unsaved calleeSaves in register to vm calleeSave buffer
loadPtr(&topEntryFrame, temp1);
addPtr(TrustedImm32(EntryFrame::calleeSaveRegistersBufferOffset()), temp1);
RegisterAtOffsetList* allCalleeSaves = RegisterSet::vmCalleeSaveRegisterOffsets();
const RegisterAtOffsetList* currentCalleeSaves = codeBlock()->calleeSaveRegisters();
RegisterSet dontCopyRegisters = RegisterSet::stackRegisters();
unsigned registerCount = allCalleeSaves->size();
for (unsigned i = 0; i < registerCount; i++) {
RegisterAtOffset entry = allCalleeSaves->at(i);
if (dontCopyRegisters.get(entry.reg()))
continue;
RegisterAtOffset* currentFrameEntry = currentCalleeSaves->find(entry.reg());
if (entry.reg().isGPR()) {
GPRReg regToStore;
if (currentFrameEntry) {
// Load calleeSave from stack into temp register
regToStore = temp2;
loadPtr(Address(framePointerRegister, currentFrameEntry->offset()), regToStore);
} else
// Just store callee save directly
regToStore = entry.reg().gpr();
storePtr(regToStore, Address(temp1, entry.offset()));
} else {
FPRReg fpRegToStore;
if (currentFrameEntry) {
// Load calleeSave from stack into temp register
fpRegToStore = fpTemp;
loadDouble(Address(framePointerRegister, currentFrameEntry->offset()), fpRegToStore);
} else
// Just store callee save directly
fpRegToStore = entry.reg().fpr();
storeDouble(fpRegToStore, Address(temp1, entry.offset()));
}
}
#else
UNUSED_PARAM(topEntryFrame);
UNUSED_PARAM(usedRegisters);
#endif
}
void emitMaterializeTagCheckRegisters()
{
#if USE(JSVALUE64)
move(MacroAssembler::TrustedImm64(JSValue::NumberTag), GPRInfo::numberTagRegister);
or64(MacroAssembler::TrustedImm32(JSValue::OtherTag), GPRInfo::numberTagRegister, GPRInfo::notCellMaskRegister);
#endif
}
#if CPU(X86_64)
static constexpr size_t prologueStackPointerDelta()
{
// Prologue only saves the framePointerRegister
return sizeof(void*);
}
void emitFunctionPrologue()
{
push(framePointerRegister);
move(stackPointerRegister, framePointerRegister);
}
void emitFunctionEpilogueWithEmptyFrame()
{
pop(framePointerRegister);
}
void emitFunctionEpilogue()
{
move(framePointerRegister, stackPointerRegister);
pop(framePointerRegister);
}
void preserveReturnAddressAfterCall(GPRReg reg)
{
pop(reg);
}
void restoreReturnAddressBeforeReturn(GPRReg reg)
{
push(reg);
}
void restoreReturnAddressBeforeReturn(Address address)
{
push(address);
}
// dest = base + index << shift.
void shiftAndAdd(RegisterID base, RegisterID index, uint8_t shift, RegisterID dest, Optional<RegisterID> optionalScratch = { })
{
ASSERT(shift < 32);
if (shift <= 3) {
x86Lea64(BaseIndex(base, index, static_cast<Scale>(shift)), dest);
return;
}
RegisterID scratch = dest;
bool needToPreserveIndexRegister = false;
if (base == dest) {
scratch = optionalScratch ? optionalScratch.value() : scratchRegister();
if (base == scratch) {
scratch = index;
needToPreserveIndexRegister = true;
} else if (index == scratch)
needToPreserveIndexRegister = true;
if (needToPreserveIndexRegister)
push(index);
}
move(index, scratch);
lshift64(TrustedImm32(shift), scratch);
m_assembler.leaq_mr(0, base, scratch, 0, dest);
if (needToPreserveIndexRegister)
pop(index);
}
#endif // CPU(X86_64)
#if CPU(ARM_THUMB2) || CPU(ARM64)
static constexpr size_t prologueStackPointerDelta()
{
// Prologue saves the framePointerRegister and linkRegister
return 2 * sizeof(void*);
}
void emitFunctionPrologue()
{
tagReturnAddress();
pushPair(framePointerRegister, linkRegister);
move(stackPointerRegister, framePointerRegister);
}
void emitFunctionEpilogueWithEmptyFrame()
{
popPair(framePointerRegister, linkRegister);
}
void emitFunctionEpilogue()
{
move(framePointerRegister, stackPointerRegister);
emitFunctionEpilogueWithEmptyFrame();
}
ALWAYS_INLINE void preserveReturnAddressAfterCall(RegisterID reg)
{
move(linkRegister, reg);
}
ALWAYS_INLINE void restoreReturnAddressBeforeReturn(RegisterID reg)
{
move(reg, linkRegister);
}
ALWAYS_INLINE void restoreReturnAddressBeforeReturn(Address address)
{
loadPtr(address, linkRegister);
}
#if CPU(ARM64)
// dest = base + index << shift.
void shiftAndAdd(RegisterID base, RegisterID index, uint8_t shift, RegisterID dest, Optional<RegisterID> = { })
{
ASSERT(shift < 32);
ASSERT(base != index);
getEffectiveAddress(BaseIndex(base, index, static_cast<Scale>(shift)), dest);
}
#endif // CPU(ARM64)
#endif
#if CPU(MIPS)
static constexpr size_t prologueStackPointerDelta()
{
// Prologue saves the framePointerRegister and returnAddressRegister
return 2 * sizeof(void*);
}
void emitFunctionPrologue()
{
pushPair(framePointerRegister, returnAddressRegister);
move(stackPointerRegister, framePointerRegister);
}
void emitFunctionEpilogueWithEmptyFrame()
{
popPair(framePointerRegister, returnAddressRegister);
}
void emitFunctionEpilogue()
{
move(framePointerRegister, stackPointerRegister);
emitFunctionEpilogueWithEmptyFrame();
}
ALWAYS_INLINE void preserveReturnAddressAfterCall(RegisterID reg)
{
move(returnAddressRegister, reg);
}
ALWAYS_INLINE void restoreReturnAddressBeforeReturn(RegisterID reg)
{
move(reg, returnAddressRegister);
}
ALWAYS_INLINE void restoreReturnAddressBeforeReturn(Address address)
{
loadPtr(address, returnAddressRegister);
}
#endif
void emitGetFromCallFrameHeaderPtr(VirtualRegister entry, GPRReg to, GPRReg from = GPRInfo::callFrameRegister)
{
ASSERT(entry.isHeader());
loadPtr(Address(from, entry.offset() * sizeof(Register)), to);
}
void emitGetFromCallFrameHeader32(VirtualRegister entry, GPRReg to, GPRReg from = GPRInfo::callFrameRegister)
{
ASSERT(entry.isHeader());
load32(Address(from, entry.offset() * sizeof(Register)), to);
}
#if USE(JSVALUE64)
void emitGetFromCallFrameHeader64(VirtualRegister entry, GPRReg to, GPRReg from = GPRInfo::callFrameRegister)
{
ASSERT(entry.isHeader());
load64(Address(from, entry.offset() * sizeof(Register)), to);
}
#endif // USE(JSVALUE64)
void emitPutToCallFrameHeader(GPRReg from, VirtualRegister entry)
{
ASSERT(entry.isHeader());
storePtr(from, Address(GPRInfo::callFrameRegister, entry.offset() * sizeof(Register)));
}
void emitPutToCallFrameHeader(void* value, VirtualRegister entry)
{
ASSERT(entry.isHeader());
storePtr(TrustedImmPtr(value), Address(GPRInfo::callFrameRegister, entry.offset() * sizeof(Register)));
}
void emitGetCallerFrameFromCallFrameHeaderPtr(RegisterID to)
{
loadPtr(Address(GPRInfo::callFrameRegister, CallFrame::callerFrameOffset()), to);
}
void emitPutCallerFrameToCallFrameHeader(RegisterID from)
{
storePtr(from, Address(GPRInfo::callFrameRegister, CallFrame::callerFrameOffset()));
}
void emitPutReturnPCToCallFrameHeader(RegisterID from)
{
storePtr(from, Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()));
}
void emitPutReturnPCToCallFrameHeader(TrustedImmPtr from)
{
storePtr(from, Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()));
}
// emitPutToCallFrameHeaderBeforePrologue() and related are used to access callee frame header
// fields before the code from emitFunctionPrologue() has executed.
// First, the access is via the stack pointer. Second, the address calculation must also take
// into account that the stack pointer may not have been adjusted down for the return PC and/or
// caller's frame pointer. On some platforms, the callee is responsible for pushing the
// "link register" containing the return address in the function prologue.
#if USE(JSVALUE64)
void emitPutToCallFrameHeaderBeforePrologue(GPRReg from, VirtualRegister entry)
{
storePtr(from, Address(stackPointerRegister, entry.offset() * static_cast<ptrdiff_t>(sizeof(Register)) - prologueStackPointerDelta()));
}
#else
void emitPutPayloadToCallFrameHeaderBeforePrologue(GPRReg from, VirtualRegister entry)
{
storePtr(from, Address(stackPointerRegister, entry.offset() * static_cast<ptrdiff_t>(sizeof(Register)) - prologueStackPointerDelta() + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
}
void emitPutTagToCallFrameHeaderBeforePrologue(TrustedImm32 tag, VirtualRegister entry)
{
storePtr(tag, Address(stackPointerRegister, entry.offset() * static_cast<ptrdiff_t>(sizeof(Register)) - prologueStackPointerDelta() + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
}
#endif
JumpList branchIfNotEqual(JSValueRegs regs, JSValue value)
{
#if USE(JSVALUE64)
return branch64(NotEqual, regs.gpr(), TrustedImm64(JSValue::encode(value)));
#else
JumpList result;
result.append(branch32(NotEqual, regs.tagGPR(), TrustedImm32(value.tag())));
if (value.isEmpty() || value.isUndefinedOrNull())
return result; // These don't have anything interesting in the payload.
result.append(branch32(NotEqual, regs.payloadGPR(), TrustedImm32(value.payload())));
return result;
#endif
}
Jump branchIfEqual(JSValueRegs regs, JSValue value)
{
#if USE(JSVALUE64)
return branch64(Equal, regs.gpr(), TrustedImm64(JSValue::encode(value)));
#else
Jump notEqual;
// These don't have anything interesting in the payload.
if (!value.isEmpty() && !value.isUndefinedOrNull())
notEqual = branch32(NotEqual, regs.payloadGPR(), TrustedImm32(value.payload()));
Jump result = branch32(Equal, regs.tagGPR(), TrustedImm32(value.tag()));
if (notEqual.isSet())
notEqual.link(this);
return result;
#endif
}
Jump branchIfNotCell(GPRReg reg, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
if (mode == HaveTagRegisters)
return branchTest64(NonZero, reg, GPRInfo::notCellMaskRegister);
return branchTest64(NonZero, reg, TrustedImm64(JSValue::NotCellMask));
#else
UNUSED_PARAM(mode);
return branch32(MacroAssembler::NotEqual, reg, TrustedImm32(JSValue::CellTag));
#endif
}
Jump branchIfNotCell(JSValueRegs regs, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
return branchIfNotCell(regs.gpr(), mode);
#else
return branchIfNotCell(regs.tagGPR(), mode);
#endif
}
Jump branchIfCell(GPRReg reg, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
if (mode == HaveTagRegisters)
return branchTest64(Zero, reg, GPRInfo::notCellMaskRegister);
return branchTest64(Zero, reg, TrustedImm64(JSValue::NotCellMask));
#else
UNUSED_PARAM(mode);
return branch32(MacroAssembler::Equal, reg, TrustedImm32(JSValue::CellTag));
#endif
}
Jump branchIfCell(JSValueRegs regs, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
return branchIfCell(regs.gpr(), mode);
#else
return branchIfCell(regs.tagGPR(), mode);
#endif
}
Jump branchIfOther(JSValueRegs regs, GPRReg tempGPR)
{
#if USE(JSVALUE64)
move(regs.gpr(), tempGPR);
and64(TrustedImm32(~JSValue::UndefinedTag), tempGPR);
return branch64(Equal, tempGPR, TrustedImm64(JSValue::ValueNull));
#else
or32(TrustedImm32(1), regs.tagGPR(), tempGPR);
return branch32(Equal, tempGPR, TrustedImm32(JSValue::NullTag));
#endif
}
Jump branchIfNotOther(JSValueRegs regs, GPRReg tempGPR)
{
#if USE(JSVALUE64)
move(regs.gpr(), tempGPR);
and64(TrustedImm32(~JSValue::UndefinedTag), tempGPR);
return branch64(NotEqual, tempGPR, TrustedImm64(JSValue::ValueNull));
#else
or32(TrustedImm32(1), regs.tagGPR(), tempGPR);
return branch32(NotEqual, tempGPR, TrustedImm32(JSValue::NullTag));
#endif
}
Jump branchIfInt32(GPRReg gpr, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
if (mode == HaveTagRegisters)
return branch64(AboveOrEqual, gpr, GPRInfo::numberTagRegister);
return branch64(AboveOrEqual, gpr, TrustedImm64(JSValue::NumberTag));
#else
UNUSED_PARAM(mode);
return branch32(Equal, gpr, TrustedImm32(JSValue::Int32Tag));
#endif
}
Jump branchIfInt32(JSValueRegs regs, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
return branchIfInt32(regs.gpr(), mode);
#else
return branchIfInt32(regs.tagGPR(), mode);
#endif
}
Jump branchIfNotInt32(GPRReg gpr, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
if (mode == HaveTagRegisters)
return branch64(Below, gpr, GPRInfo::numberTagRegister);
return branch64(Below, gpr, TrustedImm64(JSValue::NumberTag));
#else
UNUSED_PARAM(mode);
return branch32(NotEqual, gpr, TrustedImm32(JSValue::Int32Tag));
#endif
}
Jump branchIfNotInt32(JSValueRegs regs, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
return branchIfNotInt32(regs.gpr(), mode);
#else
return branchIfNotInt32(regs.tagGPR(), mode);
#endif
}
// Note that the tempGPR is not used in 64-bit mode.
Jump branchIfNumber(JSValueRegs regs, GPRReg tempGPR, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
UNUSED_PARAM(tempGPR);
return branchIfNumber(regs.gpr(), mode);
#else
UNUSED_PARAM(mode);
ASSERT(tempGPR != InvalidGPRReg);
add32(TrustedImm32(1), regs.tagGPR(), tempGPR);
return branch32(Below, tempGPR, TrustedImm32(JSValue::LowestTag + 1));
#endif
}
#if USE(JSVALUE64)
Jump branchIfNumber(GPRReg gpr, TagRegistersMode mode = HaveTagRegisters)
{
if (mode == HaveTagRegisters)
return branchTest64(NonZero, gpr, GPRInfo::numberTagRegister);
return branchTest64(NonZero, gpr, TrustedImm64(JSValue::NumberTag));
}
#endif
// Note that the tempGPR is not used in 64-bit mode.
Jump branchIfNotNumber(JSValueRegs regs, GPRReg tempGPR, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
UNUSED_PARAM(tempGPR);
return branchIfNotNumber(regs.gpr(), mode);
#else
UNUSED_PARAM(mode);
add32(TrustedImm32(1), regs.tagGPR(), tempGPR);
return branch32(AboveOrEqual, tempGPR, TrustedImm32(JSValue::LowestTag + 1));
#endif
}
#if USE(JSVALUE64)
Jump branchIfNotNumber(GPRReg gpr, TagRegistersMode mode = HaveTagRegisters)
{
if (mode == HaveTagRegisters)
return branchTest64(Zero, gpr, GPRInfo::numberTagRegister);
return branchTest64(Zero, gpr, TrustedImm64(JSValue::NumberTag));
}
#endif
Jump branchIfNotDoubleKnownNotInt32(JSValueRegs regs, TagRegistersMode mode = HaveTagRegisters)
{
#if USE(JSVALUE64)
if (mode == HaveTagRegisters)
return branchTest64(Zero, regs.gpr(), GPRInfo::numberTagRegister);
return branchTest64(Zero, regs.gpr(), TrustedImm64(JSValue::NumberTag));
#else
UNUSED_PARAM(mode);
return branch32(AboveOrEqual, regs.tagGPR(), TrustedImm32(JSValue::LowestTag));
#endif
}
// Note that the tempGPR is not used in 32-bit mode.
Jump branchIfBoolean(GPRReg gpr, GPRReg tempGPR)
{
#if USE(JSVALUE64)
ASSERT(tempGPR != InvalidGPRReg);
move(gpr, tempGPR);
xor64(TrustedImm32(JSValue::ValueFalse), tempGPR);
return branchTest64(Zero, tempGPR, TrustedImm32(static_cast<int32_t>(~1)));
#else
UNUSED_PARAM(tempGPR);
return branch32(Equal, gpr, TrustedImm32(JSValue::BooleanTag));
#endif
}
// Note that the tempGPR is not used in 32-bit mode.
Jump branchIfBoolean(JSValueRegs regs, GPRReg tempGPR)
{
#if USE(JSVALUE64)
return branchIfBoolean(regs.gpr(), tempGPR);
#else
return branchIfBoolean(regs.tagGPR(), tempGPR);
#endif
}
// Note that the tempGPR is not used in 32-bit mode.
Jump branchIfNotBoolean(GPRReg gpr, GPRReg tempGPR)
{
#if USE(JSVALUE64)
ASSERT(tempGPR != InvalidGPRReg);
move(gpr, tempGPR);
xor64(TrustedImm32(JSValue::ValueFalse), tempGPR);
return branchTest64(NonZero, tempGPR, TrustedImm32(static_cast<int32_t>(~1)));
#else
UNUSED_PARAM(tempGPR);
return branch32(NotEqual, gpr, TrustedImm32(JSValue::BooleanTag));
#endif
}
// Note that the tempGPR is not used in 32-bit mode.
Jump branchIfNotBoolean(JSValueRegs regs, GPRReg tempGPR)
{
#if USE(JSVALUE64)
return branchIfNotBoolean(regs.gpr(), tempGPR);
#else
return branchIfNotBoolean(regs.tagGPR(), tempGPR);
#endif
}
#if USE(BIGINT32)
Jump branchIfBigInt32(GPRReg gpr, GPRReg tempGPR, TagRegistersMode mode = HaveTagRegisters)
{
ASSERT(tempGPR != InvalidGPRReg);