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/*
* Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AssemblyHelpers_h
#define AssemblyHelpers_h
#include <wtf/Platform.h>
#if ENABLE(JIT)
#include "CodeBlock.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "JITCode.h"
#include "MacroAssembler.h"
#include "VM.h"
namespace JSC {
typedef void (*V_DebugOperation_EPP)(ExecState*, void*, void*);
class AssemblyHelpers : public MacroAssembler {
public:
AssemblyHelpers(VM* vm, CodeBlock* codeBlock)
: m_vm(vm)
, m_codeBlock(codeBlock)
, m_baselineCodeBlock(codeBlock ? codeBlock->baselineAlternative() : 0)
{
if (m_codeBlock) {
ASSERT(m_baselineCodeBlock);
ASSERT(!m_baselineCodeBlock->alternative());
ASSERT(m_baselineCodeBlock->jitType() == JITCode::None || JITCode::isBaselineCode(m_baselineCodeBlock->jitType()));
}
}
CodeBlock* codeBlock() { return m_codeBlock; }
VM* vm() { return m_vm; }
AssemblerType_T& assembler() { return m_assembler; }
#if CPU(X86_64) || CPU(X86)
void preserveReturnAddressAfterCall(GPRReg reg)
{
pop(reg);
}
void restoreReturnAddressBeforeReturn(GPRReg reg)
{
push(reg);
}
void restoreReturnAddressBeforeReturn(Address address)
{
push(address);
}
#endif // CPU(X86_64) || CPU(X86)
#if CPU(ARM) || CPU(ARM64)
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);
}
#endif
#if CPU(MIPS)
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
#if CPU(SH4)
ALWAYS_INLINE void preserveReturnAddressAfterCall(RegisterID reg)
{
m_assembler.stspr(reg);
}
ALWAYS_INLINE void restoreReturnAddressBeforeReturn(RegisterID reg)
{
m_assembler.ldspr(reg);
}
ALWAYS_INLINE void restoreReturnAddressBeforeReturn(Address address)
{
loadPtrLinkReg(address);
}
#endif
void emitGetFromCallFrameHeaderPtr(JSStack::CallFrameHeaderEntry entry, GPRReg to)
{
loadPtr(Address(GPRInfo::callFrameRegister, entry * sizeof(Register)), to);
}
void emitPutToCallFrameHeader(GPRReg from, JSStack::CallFrameHeaderEntry entry)
{
storePtr(from, Address(GPRInfo::callFrameRegister, entry * sizeof(Register)));
}
void emitPutImmediateToCallFrameHeader(void* value, JSStack::CallFrameHeaderEntry entry)
{
storePtr(TrustedImmPtr(value), Address(GPRInfo::callFrameRegister, entry * 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 emitGetReturnPCFromCallFrameHeaderPtr(RegisterID to)
{
loadPtr(Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()), to);
}
void emitPutReturnPCToCallFrameHeader(RegisterID from)
{
storePtr(from, Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()));
}
void emitPutReturnPCToCallFrameHeader(TrustedImmPtr from)
{
storePtr(from, Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()));
}
Jump branchIfNotCell(GPRReg reg)
{
#if USE(JSVALUE64)
return branchTest64(MacroAssembler::NonZero, reg, GPRInfo::tagMaskRegister);
#else
return branch32(MacroAssembler::NotEqual, reg, TrustedImm32(JSValue::CellTag));
#endif
}
static Address addressForByteOffset(ptrdiff_t byteOffset)
{
return Address(GPRInfo::callFrameRegister, byteOffset);
}
static Address addressFor(VirtualRegister virtualRegister, GPRReg baseReg)
{
ASSERT(virtualRegister.isValid());
return Address(baseReg, virtualRegister.offset() * sizeof(Register));
}
static Address addressFor(VirtualRegister virtualRegister)
{
ASSERT(virtualRegister.isValid());
return Address(GPRInfo::callFrameRegister, virtualRegister.offset() * sizeof(Register));
}
static Address addressFor(int operand)
{
return addressFor(static_cast<VirtualRegister>(operand));
}
static Address tagFor(VirtualRegister virtualRegister)
{
ASSERT(virtualRegister.isValid());
return Address(GPRInfo::callFrameRegister, virtualRegister.offset() * sizeof(Register) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
}
static Address tagFor(int operand)
{
return tagFor(static_cast<VirtualRegister>(operand));
}
static Address payloadFor(VirtualRegister virtualRegister)
{
ASSERT(virtualRegister.isValid());
return Address(GPRInfo::callFrameRegister, virtualRegister.offset() * sizeof(Register) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
}
static Address payloadFor(int operand)
{
return payloadFor(static_cast<VirtualRegister>(operand));
}
Jump branchIfNotObject(GPRReg structureReg)
{
return branch8(Below, Address(structureReg, Structure::typeInfoTypeOffset()), TrustedImm32(ObjectType));
}
static GPRReg selectScratchGPR(GPRReg preserve1 = InvalidGPRReg, GPRReg preserve2 = InvalidGPRReg, GPRReg preserve3 = InvalidGPRReg, GPRReg preserve4 = InvalidGPRReg)
{
if (preserve1 != GPRInfo::regT0 && preserve2 != GPRInfo::regT0 && preserve3 != GPRInfo::regT0 && preserve4 != GPRInfo::regT0)
return GPRInfo::regT0;
if (preserve1 != GPRInfo::regT1 && preserve2 != GPRInfo::regT1 && preserve3 != GPRInfo::regT1 && preserve4 != GPRInfo::regT1)
return GPRInfo::regT1;
if (preserve1 != GPRInfo::regT2 && preserve2 != GPRInfo::regT2 && preserve3 != GPRInfo::regT2 && preserve4 != GPRInfo::regT2)
return GPRInfo::regT2;
if (preserve1 != GPRInfo::regT3 && preserve2 != GPRInfo::regT3 && preserve3 != GPRInfo::regT3 && preserve4 != GPRInfo::regT3)
return GPRInfo::regT3;
return GPRInfo::regT4;
}
// Add a debug call. This call has no effect on JIT code execution state.
void debugCall(V_DebugOperation_EPP function, void* argument)
{
size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
ScratchBuffer* scratchBuffer = m_vm->scratchBufferForSize(scratchSize);
EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
store64(GPRInfo::toRegister(i), buffer + i);
#else
store32(GPRInfo::toRegister(i), buffer + i);
#endif
}
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
move(TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
storeDouble(FPRInfo::toRegister(i), GPRInfo::regT0);
}
// Tell GC mark phase how much of the scratch buffer is active during call.
move(TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
storePtr(TrustedImmPtr(scratchSize), GPRInfo::regT0);
#if CPU(X86_64) || CPU(ARM) || CPU(ARM64) || CPU(MIPS) || CPU(SH4)
move(TrustedImmPtr(buffer), GPRInfo::argumentGPR2);
move(TrustedImmPtr(argument), GPRInfo::argumentGPR1);
move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
GPRReg scratch = selectScratchGPR(GPRInfo::argumentGPR0, GPRInfo::argumentGPR1, GPRInfo::argumentGPR2);
#elif CPU(X86)
poke(GPRInfo::callFrameRegister, 0);
poke(TrustedImmPtr(argument), 1);
poke(TrustedImmPtr(buffer), 2);
GPRReg scratch = GPRInfo::regT0;
#else
#error "JIT not supported on this platform."
#endif
move(TrustedImmPtr(reinterpret_cast<void*>(function)), scratch);
call(scratch);
move(TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
storePtr(TrustedImmPtr(0), GPRInfo::regT0);
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
move(TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
loadDouble(GPRInfo::regT0, FPRInfo::toRegister(i));
}
for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
load64(buffer + i, GPRInfo::toRegister(i));
#else
load32(buffer + i, GPRInfo::toRegister(i));
#endif
}
}
// These methods JIT generate dynamic, debug-only checks - akin to ASSERTs.
#if !ASSERT_DISABLED
void jitAssertIsInt32(GPRReg);
void jitAssertIsJSInt32(GPRReg);
void jitAssertIsJSNumber(GPRReg);
void jitAssertIsJSDouble(GPRReg);
void jitAssertIsCell(GPRReg);
void jitAssertHasValidCallFrame();
void jitAssertIsNull(GPRReg);
#else
void jitAssertIsInt32(GPRReg) { }
void jitAssertIsJSInt32(GPRReg) { }
void jitAssertIsJSNumber(GPRReg) { }
void jitAssertIsJSDouble(GPRReg) { }
void jitAssertIsCell(GPRReg) { }
void jitAssertHasValidCallFrame() { }
void jitAssertIsNull(GPRReg) { }
#endif
// These methods convert between doubles, and doubles boxed and JSValues.
#if USE(JSVALUE64)
GPRReg boxDouble(FPRReg fpr, GPRReg gpr)
{
moveDoubleTo64(fpr, gpr);
sub64(GPRInfo::tagTypeNumberRegister, gpr);
jitAssertIsJSDouble(gpr);
return gpr;
}
FPRReg unboxDouble(GPRReg gpr, FPRReg fpr)
{
jitAssertIsJSDouble(gpr);
add64(GPRInfo::tagTypeNumberRegister, gpr);
move64ToDouble(gpr, fpr);
return fpr;
}
// Here are possible arrangements of source, target, scratch:
// - source, target, scratch can all be separate registers.
// - source and target can be the same but scratch is separate.
// - target and scratch can be the same but source is separate.
void boxInt52(GPRReg source, GPRReg target, GPRReg scratch, FPRReg fpScratch)
{
// Is it an int32?
signExtend32ToPtr(source, scratch);
Jump isInt32 = branch64(Equal, source, scratch);
// Nope, it's not, but regT0 contains the int64 value.
convertInt64ToDouble(source, fpScratch);
boxDouble(fpScratch, target);
Jump done = jump();
isInt32.link(this);
zeroExtend32ToPtr(source, target);
or64(GPRInfo::tagTypeNumberRegister, target);
done.link(this);
}
#endif
#if USE(JSVALUE32_64)
void boxDouble(FPRReg fpr, GPRReg tagGPR, GPRReg payloadGPR)
{
moveDoubleToInts(fpr, payloadGPR, tagGPR);
}
void unboxDouble(GPRReg tagGPR, GPRReg payloadGPR, FPRReg fpr, FPRReg scratchFPR)
{
moveIntsToDouble(payloadGPR, tagGPR, fpr, scratchFPR);
}
#endif
enum ExceptionCheckKind { NormalExceptionCheck, InvertedExceptionCheck };
Jump emitExceptionCheck(ExceptionCheckKind kind = NormalExceptionCheck)
{
#if USE(JSVALUE64)
return branchTest64(kind == NormalExceptionCheck ? NonZero : Zero, AbsoluteAddress(vm()->addressOfException()));
#elif USE(JSVALUE32_64)
return branch32(kind == NormalExceptionCheck ? NotEqual : Equal, AbsoluteAddress(reinterpret_cast<char*>(vm()->addressOfException()) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::EmptyValueTag));
#endif
}
#if ENABLE(SAMPLING_COUNTERS)
static void emitCount(MacroAssembler& jit, AbstractSamplingCounter& counter, int32_t increment = 1)
{
jit.add64(TrustedImm32(increment), AbsoluteAddress(counter.addressOfCounter()));
}
void emitCount(AbstractSamplingCounter& counter, int32_t increment = 1)
{
add64(TrustedImm32(increment), AbsoluteAddress(counter.addressOfCounter()));
}
#endif
#if ENABLE(SAMPLING_FLAGS)
void setSamplingFlag(int32_t);
void clearSamplingFlag(int32_t flag);
#endif
JSGlobalObject* globalObjectFor(CodeOrigin codeOrigin)
{
return codeBlock()->globalObjectFor(codeOrigin);
}
bool isStrictModeFor(CodeOrigin codeOrigin)
{
if (!codeOrigin.inlineCallFrame)
return codeBlock()->isStrictMode();
return jsCast<FunctionExecutable*>(codeOrigin.inlineCallFrame->executable.get())->isStrictMode();
}
ECMAMode ecmaModeFor(CodeOrigin codeOrigin)
{
return isStrictModeFor(codeOrigin) ? StrictMode : NotStrictMode;
}
ExecutableBase* executableFor(const CodeOrigin& codeOrigin);
CodeBlock* baselineCodeBlockFor(const CodeOrigin& codeOrigin)
{
return baselineCodeBlockForOriginAndBaselineCodeBlock(codeOrigin, baselineCodeBlock());
}
CodeBlock* baselineCodeBlockFor(InlineCallFrame* inlineCallFrame)
{
if (!inlineCallFrame)
return baselineCodeBlock();
return baselineCodeBlockForInlineCallFrame(inlineCallFrame);
}
CodeBlock* baselineCodeBlock()
{
return m_baselineCodeBlock;
}
VirtualRegister baselineArgumentsRegisterFor(InlineCallFrame* inlineCallFrame)
{
if (!inlineCallFrame)
return baselineCodeBlock()->argumentsRegister();
return VirtualRegister(baselineCodeBlockForInlineCallFrame(
inlineCallFrame)->argumentsRegister().offset() + inlineCallFrame->stackOffset);
}
VirtualRegister baselineArgumentsRegisterFor(const CodeOrigin& codeOrigin)
{
return baselineArgumentsRegisterFor(codeOrigin.inlineCallFrame);
}
SymbolTable* symbolTableFor(const CodeOrigin& codeOrigin)
{
return baselineCodeBlockFor(codeOrigin)->symbolTable();
}
int offsetOfLocals(const CodeOrigin& codeOrigin)
{
if (!codeOrigin.inlineCallFrame)
return 0;
return codeOrigin.inlineCallFrame->stackOffset * sizeof(Register);
}
int offsetOfArgumentsIncludingThis(InlineCallFrame* inlineCallFrame)
{
if (!inlineCallFrame)
return CallFrame::argumentOffsetIncludingThis(0) * sizeof(Register);
if (inlineCallFrame->arguments.size() <= 1)
return 0;
ValueRecovery recovery = inlineCallFrame->arguments[1];
RELEASE_ASSERT(recovery.technique() == DisplacedInJSStack);
return (recovery.virtualRegister().offset() - 1) * sizeof(Register);
}
int offsetOfArgumentsIncludingThis(const CodeOrigin& codeOrigin)
{
return offsetOfArgumentsIncludingThis(codeOrigin.inlineCallFrame);
}
void writeBarrier(GPRReg owner, GPRReg scratch1, GPRReg scratch2, WriteBarrierUseKind useKind)
{
UNUSED_PARAM(owner);
UNUSED_PARAM(scratch1);
UNUSED_PARAM(scratch2);
UNUSED_PARAM(useKind);
ASSERT(owner != scratch1);
ASSERT(owner != scratch2);
ASSERT(scratch1 != scratch2);
#if ENABLE(WRITE_BARRIER_PROFILING)
emitCount(WriteBarrierCounters::jitCounterFor(useKind));
#endif
}
Vector<BytecodeAndMachineOffset>& decodedCodeMapFor(CodeBlock*);
protected:
VM* m_vm;
CodeBlock* m_codeBlock;
CodeBlock* m_baselineCodeBlock;
HashMap<CodeBlock*, Vector<BytecodeAndMachineOffset>> m_decodedCodeMaps;
};
} // namespace JSC
#endif // ENABLE(JIT)
#endif // AssemblyHelpers_h