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DFGSpeculativeJIT.cpp
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3069 lines (2607 loc) · 124 KB
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/*
* Copyright (C) 2011 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"
#include "DFGSpeculativeJIT.h"
#if ENABLE(DFG_JIT)
#include "LinkBuffer.h"
namespace JSC { namespace DFG {
// On Windows we need to wrap fmod; on other platforms we can call it directly.
// On ARMv7 we assert that all function pointers have to low bit set (point to thumb code).
#if CALLING_CONVENTION_IS_STDCALL || CPU(ARM_THUMB2)
static double DFG_OPERATION fmodAsDFGOperation(double x, double y)
{
return fmod(x, y);
}
#else
#define fmodAsDFGOperation fmod
#endif
void SpeculativeJIT::clearGenerationInfo()
{
for (unsigned i = 0; i < m_generationInfo.size(); ++i)
m_generationInfo[i] = GenerationInfo();
m_gprs = RegisterBank<GPRInfo>();
m_fprs = RegisterBank<FPRInfo>();
}
GPRReg SpeculativeJIT::fillStorage(NodeIndex nodeIndex)
{
Node& node = m_jit.graph()[nodeIndex];
VirtualRegister virtualRegister = node.virtualRegister();
GenerationInfo& info = m_generationInfo[virtualRegister];
switch (info.registerFormat()) {
case DataFormatNone: {
if (info.spillFormat() == DataFormatStorage) {
GPRReg gpr = allocate();
m_gprs.retain(gpr, virtualRegister, SpillOrderSpilled);
m_jit.loadPtr(JITCompiler::addressFor(virtualRegister), gpr);
info.fillStorage(gpr);
return gpr;
}
// Must be a cell; fill it as a cell and then return the pointer.
return fillSpeculateCell(nodeIndex);
}
case DataFormatStorage: {
GPRReg gpr = info.gpr();
m_gprs.lock(gpr);
return gpr;
}
default:
return fillSpeculateCell(nodeIndex);
}
}
void SpeculativeJIT::useChildren(Node& node)
{
if (node.flags() & NodeHasVarArgs) {
for (unsigned childIdx = node.firstChild(); childIdx < node.firstChild() + node.numChildren(); childIdx++)
use(m_jit.graph().m_varArgChildren[childIdx]);
} else {
Edge child1 = node.child1();
if (!child1) {
ASSERT(!node.child2() && !node.child3());
return;
}
use(child1);
Edge child2 = node.child2();
if (!child2) {
ASSERT(!node.child3());
return;
}
use(child2);
Edge child3 = node.child3();
if (!child3)
return;
use(child3);
}
}
bool SpeculativeJIT::isStrictInt32(NodeIndex nodeIndex)
{
if (isInt32Constant(nodeIndex))
return true;
Node& node = m_jit.graph()[nodeIndex];
GenerationInfo& info = m_generationInfo[node.virtualRegister()];
return info.registerFormat() == DataFormatInteger;
}
bool SpeculativeJIT::isKnownInteger(NodeIndex nodeIndex)
{
if (isInt32Constant(nodeIndex))
return true;
Node& node = m_jit.graph()[nodeIndex];
if (node.hasInt32Result())
return true;
GenerationInfo& info = m_generationInfo[node.virtualRegister()];
return info.isJSInteger();
}
bool SpeculativeJIT::isKnownNumeric(NodeIndex nodeIndex)
{
if (isInt32Constant(nodeIndex) || isNumberConstant(nodeIndex))
return true;
Node& node = m_jit.graph()[nodeIndex];
if (node.hasNumberResult())
return true;
GenerationInfo& info = m_generationInfo[node.virtualRegister()];
return info.isJSInteger() || info.isJSDouble();
}
bool SpeculativeJIT::isKnownCell(NodeIndex nodeIndex)
{
return m_generationInfo[m_jit.graph()[nodeIndex].virtualRegister()].isJSCell();
}
bool SpeculativeJIT::isKnownNotCell(NodeIndex nodeIndex)
{
Node& node = m_jit.graph()[nodeIndex];
VirtualRegister virtualRegister = node.virtualRegister();
GenerationInfo& info = m_generationInfo[virtualRegister];
if (node.hasConstant() && !valueOfJSConstant(nodeIndex).isCell())
return true;
return !(info.isJSCell() || info.isUnknownJS());
}
bool SpeculativeJIT::isKnownNotInteger(NodeIndex nodeIndex)
{
Node& node = m_jit.graph()[nodeIndex];
VirtualRegister virtualRegister = node.virtualRegister();
GenerationInfo& info = m_generationInfo[virtualRegister];
return info.isJSDouble() || info.isJSCell() || info.isJSBoolean()
|| (node.hasConstant() && !valueOfJSConstant(nodeIndex).isInt32());
}
bool SpeculativeJIT::isKnownNotNumber(NodeIndex nodeIndex)
{
Node& node = m_jit.graph()[nodeIndex];
VirtualRegister virtualRegister = node.virtualRegister();
GenerationInfo& info = m_generationInfo[virtualRegister];
return (!info.isJSDouble() && !info.isJSInteger() && !info.isUnknownJS())
|| (node.hasConstant() && !isNumberConstant(nodeIndex));
}
void SpeculativeJIT::writeBarrier(MacroAssembler& jit, GPRReg owner, GPRReg scratch1, GPRReg scratch2, WriteBarrierUseKind useKind)
{
UNUSED_PARAM(jit);
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)
JITCompiler::emitCount(jit, WriteBarrierCounters::jitCounterFor(useKind));
#endif
markCellCard(jit, owner, scratch1, scratch2);
}
void SpeculativeJIT::markCellCard(MacroAssembler& jit, GPRReg owner, GPRReg scratch1, GPRReg scratch2)
{
UNUSED_PARAM(jit);
UNUSED_PARAM(owner);
UNUSED_PARAM(scratch1);
UNUSED_PARAM(scratch2);
#if ENABLE(GGC)
jit.move(owner, scratch1);
jit.andPtr(TrustedImm32(static_cast<int32_t>(MarkedBlock::blockMask)), scratch1);
jit.move(owner, scratch2);
// consume additional 8 bits as we're using an approximate filter
jit.rshift32(TrustedImm32(MarkedBlock::atomShift + 8), scratch2);
jit.andPtr(TrustedImm32(MarkedBlock::atomMask >> 8), scratch2);
MacroAssembler::Jump filter = jit.branchTest8(MacroAssembler::Zero, MacroAssembler::BaseIndex(scratch1, scratch2, MacroAssembler::TimesOne, MarkedBlock::offsetOfMarks()));
jit.move(owner, scratch2);
jit.rshift32(TrustedImm32(MarkedBlock::cardShift), scratch2);
jit.andPtr(TrustedImm32(MarkedBlock::cardMask), scratch2);
jit.store8(TrustedImm32(1), MacroAssembler::BaseIndex(scratch1, scratch2, MacroAssembler::TimesOne, MarkedBlock::offsetOfCards()));
filter.link(&jit);
#endif
}
void SpeculativeJIT::writeBarrier(GPRReg ownerGPR, GPRReg valueGPR, Edge valueUse, WriteBarrierUseKind useKind, GPRReg scratch1, GPRReg scratch2)
{
UNUSED_PARAM(ownerGPR);
UNUSED_PARAM(valueGPR);
UNUSED_PARAM(scratch1);
UNUSED_PARAM(scratch2);
UNUSED_PARAM(useKind);
if (isKnownNotCell(valueUse.index()))
return;
#if ENABLE(WRITE_BARRIER_PROFILING)
JITCompiler::emitCount(m_jit, WriteBarrierCounters::jitCounterFor(useKind));
#endif
#if ENABLE(GGC)
GPRTemporary temp1;
GPRTemporary temp2;
if (scratch1 == InvalidGPRReg) {
GPRTemporary scratchGPR(this);
temp1.adopt(scratchGPR);
scratch1 = temp1.gpr();
}
if (scratch2 == InvalidGPRReg) {
GPRTemporary scratchGPR(this);
temp2.adopt(scratchGPR);
scratch2 = temp2.gpr();
}
JITCompiler::Jump rhsNotCell;
bool hadCellCheck = false;
if (!isKnownCell(valueUse.index()) && !isCellPrediction(m_jit.getPrediction(valueUse.index()))) {
hadCellCheck = true;
rhsNotCell = m_jit.branchIfNotCell(valueGPR);
}
markCellCard(m_jit, ownerGPR, scratch1, scratch2);
if (hadCellCheck)
rhsNotCell.link(&m_jit);
#endif
}
void SpeculativeJIT::writeBarrier(GPRReg ownerGPR, JSCell* value, WriteBarrierUseKind useKind, GPRReg scratch1, GPRReg scratch2)
{
UNUSED_PARAM(ownerGPR);
UNUSED_PARAM(value);
UNUSED_PARAM(scratch1);
UNUSED_PARAM(scratch2);
UNUSED_PARAM(useKind);
if (Heap::isMarked(value))
return;
#if ENABLE(WRITE_BARRIER_PROFILING)
JITCompiler::emitCount(m_jit, WriteBarrierCounters::jitCounterFor(useKind));
#endif
#if ENABLE(GGC)
GPRTemporary temp1;
GPRTemporary temp2;
if (scratch1 == InvalidGPRReg) {
GPRTemporary scratchGPR(this);
temp1.adopt(scratchGPR);
scratch1 = temp1.gpr();
}
if (scratch2 == InvalidGPRReg) {
GPRTemporary scratchGPR(this);
temp2.adopt(scratchGPR);
scratch2 = temp2.gpr();
}
markCellCard(m_jit, ownerGPR, scratch1, scratch2);
#endif
}
void SpeculativeJIT::writeBarrier(JSCell* owner, GPRReg valueGPR, Edge valueUse, WriteBarrierUseKind useKind, GPRReg scratch)
{
UNUSED_PARAM(owner);
UNUSED_PARAM(valueGPR);
UNUSED_PARAM(scratch);
UNUSED_PARAM(useKind);
if (isKnownNotCell(valueUse.index()))
return;
#if ENABLE(WRITE_BARRIER_PROFILING)
JITCompiler::emitCount(m_jit, WriteBarrierCounters::jitCounterFor(useKind));
#endif
#if ENABLE(GGC)
JITCompiler::Jump rhsNotCell;
bool hadCellCheck = false;
if (!isKnownCell(valueUse.index()) && !isCellPrediction(m_jit.getPrediction(valueUse.index()))) {
hadCellCheck = true;
rhsNotCell = m_jit.branchIfNotCell(valueGPR);
}
GPRTemporary temp;
if (scratch == InvalidGPRReg) {
GPRTemporary scratchGPR(this);
temp.adopt(scratchGPR);
scratch = temp.gpr();
}
uint8_t* cardAddress = Heap::addressOfCardFor(owner);
m_jit.move(JITCompiler::TrustedImmPtr(cardAddress), scratch);
m_jit.store8(JITCompiler::TrustedImm32(1), JITCompiler::Address(scratch));
if (hadCellCheck)
rhsNotCell.link(&m_jit);
#endif
}
bool SpeculativeJIT::nonSpeculativeCompare(Node& node, MacroAssembler::RelationalCondition cond, S_DFGOperation_EJJ helperFunction)
{
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
NodeIndex branchNodeIndex = m_jit.graph().m_blocks[m_block]->at(branchIndexInBlock);
ASSERT(node.adjustedRefCount() == 1);
nonSpeculativePeepholeBranch(node, branchNodeIndex, cond, helperFunction);
m_indexInBlock = branchIndexInBlock;
m_compileIndex = branchNodeIndex;
return true;
}
nonSpeculativeNonPeepholeCompare(node, cond, helperFunction);
return false;
}
bool SpeculativeJIT::nonSpeculativeStrictEq(Node& node, bool invert)
{
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
NodeIndex branchNodeIndex = m_jit.graph().m_blocks[m_block]->at(branchIndexInBlock);
ASSERT(node.adjustedRefCount() == 1);
nonSpeculativePeepholeStrictEq(node, branchNodeIndex, invert);
m_indexInBlock = branchIndexInBlock;
m_compileIndex = branchNodeIndex;
return true;
}
nonSpeculativeNonPeepholeStrictEq(node, invert);
return false;
}
#ifndef NDEBUG
static const char* dataFormatString(DataFormat format)
{
// These values correspond to the DataFormat enum.
const char* strings[] = {
"[ ]",
"[ i]",
"[ d]",
"[ c]",
"Err!",
"Err!",
"Err!",
"Err!",
"[J ]",
"[Ji]",
"[Jd]",
"[Jc]",
"Err!",
"Err!",
"Err!",
"Err!",
};
return strings[format];
}
void SpeculativeJIT::dump(const char* label)
{
if (label)
dataLog("<%s>\n", label);
dataLog(" gprs:\n");
m_gprs.dump();
dataLog(" fprs:\n");
m_fprs.dump();
dataLog(" VirtualRegisters:\n");
for (unsigned i = 0; i < m_generationInfo.size(); ++i) {
GenerationInfo& info = m_generationInfo[i];
if (info.alive())
dataLog(" % 3d:%s%s", i, dataFormatString(info.registerFormat()), dataFormatString(info.spillFormat()));
else
dataLog(" % 3d:[__][__]", i);
if (info.registerFormat() == DataFormatDouble)
dataLog(":fpr%d\n", info.fpr());
else if (info.registerFormat() != DataFormatNone
#if USE(JSVALUE32_64)
&& !(info.registerFormat() & DataFormatJS)
#endif
) {
ASSERT(info.gpr() != InvalidGPRReg);
dataLog(":%s\n", GPRInfo::debugName(info.gpr()));
} else
dataLog("\n");
}
if (label)
dataLog("</%s>\n", label);
}
#endif
#if DFG_ENABLE(CONSISTENCY_CHECK)
void SpeculativeJIT::checkConsistency()
{
bool failed = false;
for (gpr_iterator iter = m_gprs.begin(); iter != m_gprs.end(); ++iter) {
if (iter.isLocked()) {
dataLog("DFG_CONSISTENCY_CHECK failed: gpr %s is locked.\n", iter.debugName());
failed = true;
}
}
for (fpr_iterator iter = m_fprs.begin(); iter != m_fprs.end(); ++iter) {
if (iter.isLocked()) {
dataLog("DFG_CONSISTENCY_CHECK failed: fpr %s is locked.\n", iter.debugName());
failed = true;
}
}
for (unsigned i = 0; i < m_generationInfo.size(); ++i) {
VirtualRegister virtualRegister = (VirtualRegister)i;
GenerationInfo& info = m_generationInfo[virtualRegister];
if (!info.alive())
continue;
switch (info.registerFormat()) {
case DataFormatNone:
break;
case DataFormatJS:
case DataFormatJSInteger:
case DataFormatJSDouble:
case DataFormatJSCell:
case DataFormatJSBoolean:
#if USE(JSVALUE32_64)
break;
#endif
case DataFormatInteger:
case DataFormatCell:
case DataFormatBoolean:
case DataFormatStorage: {
GPRReg gpr = info.gpr();
ASSERT(gpr != InvalidGPRReg);
if (m_gprs.name(gpr) != virtualRegister) {
dataLog("DFG_CONSISTENCY_CHECK failed: name mismatch for virtual register %d (gpr %s).\n", virtualRegister, GPRInfo::debugName(gpr));
failed = true;
}
break;
}
case DataFormatDouble: {
FPRReg fpr = info.fpr();
ASSERT(fpr != InvalidFPRReg);
if (m_fprs.name(fpr) != virtualRegister) {
dataLog("DFG_CONSISTENCY_CHECK failed: name mismatch for virtual register %d (fpr %s).\n", virtualRegister, FPRInfo::debugName(fpr));
failed = true;
}
break;
}
}
}
for (gpr_iterator iter = m_gprs.begin(); iter != m_gprs.end(); ++iter) {
VirtualRegister virtualRegister = iter.name();
if (virtualRegister == InvalidVirtualRegister)
continue;
GenerationInfo& info = m_generationInfo[virtualRegister];
#if USE(JSVALUE64)
if (iter.regID() != info.gpr()) {
dataLog("DFG_CONSISTENCY_CHECK failed: name mismatch for gpr %s (virtual register %d).\n", iter.debugName(), virtualRegister);
failed = true;
}
#else
if (!(info.registerFormat() & DataFormatJS)) {
if (iter.regID() != info.gpr()) {
dataLog("DFG_CONSISTENCY_CHECK failed: name mismatch for gpr %s (virtual register %d).\n", iter.debugName(), virtualRegister);
failed = true;
}
} else {
if (iter.regID() != info.tagGPR() && iter.regID() != info.payloadGPR()) {
dataLog("DFG_CONSISTENCY_CHECK failed: name mismatch for gpr %s (virtual register %d).\n", iter.debugName(), virtualRegister);
failed = true;
}
}
#endif
}
for (fpr_iterator iter = m_fprs.begin(); iter != m_fprs.end(); ++iter) {
VirtualRegister virtualRegister = iter.name();
if (virtualRegister == InvalidVirtualRegister)
continue;
GenerationInfo& info = m_generationInfo[virtualRegister];
if (iter.regID() != info.fpr()) {
dataLog("DFG_CONSISTENCY_CHECK failed: name mismatch for fpr %s (virtual register %d).\n", iter.debugName(), virtualRegister);
failed = true;
}
}
if (failed) {
dump();
CRASH();
}
}
#endif
GPRTemporary::GPRTemporary()
: m_jit(0)
, m_gpr(InvalidGPRReg)
{
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, GPRReg specific)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
m_gpr = m_jit->allocate(specific);
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, SpeculateIntegerOperand& op1)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, SpeculateIntegerOperand& op1, SpeculateIntegerOperand& op2)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else if (m_jit->canReuse(op2.index()))
m_gpr = m_jit->reuse(op2.gpr());
else
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, SpeculateStrictInt32Operand& op1)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, IntegerOperand& op1)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, IntegerOperand& op1, IntegerOperand& op2)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else if (m_jit->canReuse(op2.index()))
m_gpr = m_jit->reuse(op2.gpr());
else
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, SpeculateCellOperand& op1)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, SpeculateBooleanOperand& op1)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else
m_gpr = m_jit->allocate();
}
#if USE(JSVALUE64)
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, JSValueOperand& op1)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else
m_gpr = m_jit->allocate();
}
#else
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, JSValueOperand& op1, bool tag)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (!op1.isDouble() && m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(tag ? op1.tagGPR() : op1.payloadGPR());
else
m_gpr = m_jit->allocate();
}
#endif
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, StorageOperand& op1)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (m_jit->canReuse(op1.index()))
m_gpr = m_jit->reuse(op1.gpr());
else
m_gpr = m_jit->allocate();
}
void GPRTemporary::adopt(GPRTemporary& other)
{
ASSERT(!m_jit);
ASSERT(m_gpr == InvalidGPRReg);
ASSERT(other.m_jit);
ASSERT(other.m_gpr != InvalidGPRReg);
m_jit = other.m_jit;
m_gpr = other.m_gpr;
other.m_jit = 0;
other.m_gpr = InvalidGPRReg;
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
m_fpr = m_jit->fprAllocate();
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, DoubleOperand& op1)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (m_jit->canReuse(op1.index()))
m_fpr = m_jit->reuse(op1.fpr());
else
m_fpr = m_jit->fprAllocate();
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, DoubleOperand& op1, DoubleOperand& op2)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (m_jit->canReuse(op1.index()))
m_fpr = m_jit->reuse(op1.fpr());
else if (m_jit->canReuse(op2.index()))
m_fpr = m_jit->reuse(op2.fpr());
else
m_fpr = m_jit->fprAllocate();
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, SpeculateDoubleOperand& op1)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (m_jit->canReuse(op1.index()))
m_fpr = m_jit->reuse(op1.fpr());
else
m_fpr = m_jit->fprAllocate();
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, SpeculateDoubleOperand& op1, SpeculateDoubleOperand& op2)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (m_jit->canReuse(op1.index()))
m_fpr = m_jit->reuse(op1.fpr());
else if (m_jit->canReuse(op2.index()))
m_fpr = m_jit->reuse(op2.fpr());
else
m_fpr = m_jit->fprAllocate();
}
#if USE(JSVALUE32_64)
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, JSValueOperand& op1)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (op1.isDouble() && m_jit->canReuse(op1.index()))
m_fpr = m_jit->reuse(op1.fpr());
else
m_fpr = m_jit->fprAllocate();
}
#endif
void ValueSource::dump(FILE* out) const
{
switch (kind()) {
case SourceNotSet:
fprintf(out, "NotSet");
break;
case SourceIsDead:
fprintf(out, "IsDead");
break;
case ValueInRegisterFile:
fprintf(out, "InRegFile");
break;
case Int32InRegisterFile:
fprintf(out, "Int32");
break;
case CellInRegisterFile:
fprintf(out, "Cell");
break;
case BooleanInRegisterFile:
fprintf(out, "Bool");
break;
case DoubleInRegisterFile:
fprintf(out, "Double");
break;
case HaveNode:
fprintf(out, "Node(%d)", m_nodeIndex);
break;
}
}
void SpeculativeJIT::compilePeepHoleDoubleBranch(Node& node, NodeIndex branchNodeIndex, JITCompiler::DoubleCondition condition)
{
Node& branchNode = at(branchNodeIndex);
BlockIndex taken = branchNode.takenBlockIndex();
BlockIndex notTaken = branchNode.notTakenBlockIndex();
SpeculateDoubleOperand op1(this, node.child1());
SpeculateDoubleOperand op2(this, node.child2());
branchDouble(condition, op1.fpr(), op2.fpr(), taken);
jump(notTaken);
}
void SpeculativeJIT::compilePeepHoleObjectEquality(Node& node, NodeIndex branchNodeIndex, const ClassInfo* classInfo, PredictionChecker predictionCheck)
{
Node& branchNode = at(branchNodeIndex);
BlockIndex taken = branchNode.takenBlockIndex();
BlockIndex notTaken = branchNode.notTakenBlockIndex();
MacroAssembler::RelationalCondition condition = MacroAssembler::Equal;
if (taken == (m_block + 1)) {
condition = MacroAssembler::NotEqual;
BlockIndex tmp = taken;
taken = notTaken;
notTaken = tmp;
}
SpeculateCellOperand op1(this, node.child1());
SpeculateCellOperand op2(this, node.child2());
GPRReg op1GPR = op1.gpr();
GPRReg op2GPR = op2.gpr();
if (!predictionCheck(m_state.forNode(node.child1()).m_type))
speculationCheck(BadType, JSValueSource::unboxedCell(op1GPR), node.child1().index(), m_jit.branchPtr(MacroAssembler::NotEqual, MacroAssembler::Address(op1GPR, JSCell::classInfoOffset()), MacroAssembler::TrustedImmPtr(classInfo)));
if (!predictionCheck(m_state.forNode(node.child2()).m_type))
speculationCheck(BadType, JSValueSource::unboxedCell(op2GPR), node.child2().index(), m_jit.branchPtr(MacroAssembler::NotEqual, MacroAssembler::Address(op2GPR, JSCell::classInfoOffset()), MacroAssembler::TrustedImmPtr(classInfo)));
branchPtr(condition, op1GPR, op2GPR, taken);
jump(notTaken);
}
void SpeculativeJIT::compilePeepHoleIntegerBranch(Node& node, NodeIndex branchNodeIndex, JITCompiler::RelationalCondition condition)
{
Node& branchNode = at(branchNodeIndex);
BlockIndex taken = branchNode.takenBlockIndex();
BlockIndex notTaken = branchNode.notTakenBlockIndex();
// The branch instruction will branch to the taken block.
// If taken is next, switch taken with notTaken & invert the branch condition so we can fall through.
if (taken == (m_block + 1)) {
condition = JITCompiler::invert(condition);
BlockIndex tmp = taken;
taken = notTaken;
notTaken = tmp;
}
if (isInt32Constant(node.child1().index())) {
int32_t imm = valueOfInt32Constant(node.child1().index());
SpeculateIntegerOperand op2(this, node.child2());
branch32(condition, JITCompiler::Imm32(imm), op2.gpr(), taken);
} else if (isInt32Constant(node.child2().index())) {
SpeculateIntegerOperand op1(this, node.child1());
int32_t imm = valueOfInt32Constant(node.child2().index());
branch32(condition, op1.gpr(), JITCompiler::Imm32(imm), taken);
} else {
SpeculateIntegerOperand op1(this, node.child1());
SpeculateIntegerOperand op2(this, node.child2());
branch32(condition, op1.gpr(), op2.gpr(), taken);
}
jump(notTaken);
}
// Returns true if the compare is fused with a subsequent branch.
bool SpeculativeJIT::compilePeepHoleBranch(Node& node, MacroAssembler::RelationalCondition condition, MacroAssembler::DoubleCondition doubleCondition, S_DFGOperation_EJJ operation)
{
// Fused compare & branch.
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
NodeIndex branchNodeIndex = m_jit.graph().m_blocks[m_block]->at(branchIndexInBlock);
// detectPeepHoleBranch currently only permits the branch to be the very next node,
// so can be no intervening nodes to also reference the compare.
ASSERT(node.adjustedRefCount() == 1);
if (Node::shouldSpeculateInteger(at(node.child1()), at(node.child2())))
compilePeepHoleIntegerBranch(node, branchNodeIndex, condition);
else if (Node::shouldSpeculateNumber(at(node.child1()), at(node.child2())))
compilePeepHoleDoubleBranch(node, branchNodeIndex, doubleCondition);
else if (node.op() == CompareEq) {
if (Node::shouldSpeculateFinalObject(
at(node.child1()), at(node.child2()))) {
compilePeepHoleObjectEquality(
node, branchNodeIndex, &JSFinalObject::s_info,
isFinalObjectPrediction);
} else if (Node::shouldSpeculateArray(
at(node.child1()), at(node.child2()))) {
compilePeepHoleObjectEquality(
node, branchNodeIndex, &JSArray::s_info,
isArrayPrediction);
} else if (at(node.child1()).shouldSpeculateFinalObject()
&& at(node.child2()).shouldSpeculateFinalObjectOrOther()) {
compilePeepHoleObjectToObjectOrOtherEquality(
node.child1(), node.child2(), branchNodeIndex,
&JSFinalObject::s_info, isFinalObjectPrediction);
} else if (at(node.child1()).shouldSpeculateFinalObjectOrOther()
&& at(node.child2()).shouldSpeculateFinalObject()) {
compilePeepHoleObjectToObjectOrOtherEquality(
node.child2(), node.child1(), branchNodeIndex,
&JSFinalObject::s_info, isFinalObjectPrediction);
} else if (at(node.child1()).shouldSpeculateArray()
&& at(node.child2()).shouldSpeculateArrayOrOther()) {
compilePeepHoleObjectToObjectOrOtherEquality(
node.child1(), node.child2(), branchNodeIndex,
&JSArray::s_info, isArrayPrediction);
} else if (at(node.child1()).shouldSpeculateArrayOrOther()
&& at(node.child2()).shouldSpeculateArray()) {
compilePeepHoleObjectToObjectOrOtherEquality(
node.child2(), node.child1(), branchNodeIndex,
&JSArray::s_info, isArrayPrediction);
} else {
nonSpeculativePeepholeBranch(node, branchNodeIndex, condition, operation);
return true;
}
} else {
nonSpeculativePeepholeBranch(node, branchNodeIndex, condition, operation);
return true;
}
use(node.child1());
use(node.child2());
m_indexInBlock = branchIndexInBlock;
m_compileIndex = branchNodeIndex;
return true;
}
return false;
}
void SpeculativeJIT::compileMovHint(Node& node)
{
ASSERT(node.op() == SetLocal);
setNodeIndexForOperand(node.child1().index(), node.local());
m_lastSetOperand = node.local();
}
void SpeculativeJIT::compile(BasicBlock& block)
{
ASSERT(m_compileOkay);
if (!block.isReachable)
return;
m_blockHeads[m_block] = m_jit.label();
#if DFG_ENABLE(JIT_BREAK_ON_EVERY_BLOCK)
m_jit.breakpoint();
#endif
m_jit.jitAssertHasValidCallFrame();
ASSERT(m_arguments.size() == block.variablesAtHead.numberOfArguments());
for (size_t i = 0; i < m_arguments.size(); ++i) {
NodeIndex nodeIndex = block.variablesAtHead.argument(i);
if (nodeIndex == NoNode || m_jit.graph().argumentIsCaptured(i))
m_arguments[i] = ValueSource(ValueInRegisterFile);
else
m_arguments[i] = ValueSource::forPrediction(at(nodeIndex).variableAccessData()->prediction());
}
m_state.reset();
m_state.beginBasicBlock(&block);
ASSERT(m_variables.size() == block.variablesAtHead.numberOfLocals());
for (size_t i = 0; i < m_variables.size(); ++i) {
NodeIndex nodeIndex = block.variablesAtHead.local(i);
if ((nodeIndex == NoNode || !at(nodeIndex).refCount()) && !m_jit.graph().localIsCaptured(i))
m_variables[i] = ValueSource(SourceIsDead);
else if (m_jit.graph().localIsCaptured(i))
m_variables[i] = ValueSource(ValueInRegisterFile);
else if (at(nodeIndex).variableAccessData()->shouldUseDoubleFormat())
m_variables[i] = ValueSource(DoubleInRegisterFile);
else
m_variables[i] = ValueSource::forPrediction(at(nodeIndex).variableAccessData()->prediction());
}
m_lastSetOperand = std::numeric_limits<int>::max();
m_codeOriginForOSR = CodeOrigin();
if (DFG_ENABLE_EDGE_CODE_VERIFICATION) {
JITCompiler::Jump verificationSucceeded =
m_jit.branch32(JITCompiler::Equal, GPRInfo::regT0, TrustedImm32(m_block));
m_jit.breakpoint();
verificationSucceeded.link(&m_jit);
}
for (m_indexInBlock = 0; m_indexInBlock < block.size(); ++m_indexInBlock) {
m_compileIndex = block[m_indexInBlock];
Node& node = at(m_compileIndex);
m_codeOriginForOSR = node.codeOrigin;
if (!node.shouldGenerate()) {
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("SpeculativeJIT skipping Node @%d (bc#%u) at JIT offset 0x%x ", (int)m_compileIndex, node.codeOrigin.bytecodeIndex, m_jit.debugOffset());
#endif
switch (node.op()) {
case SetLocal:
compileMovHint(node);
break;
case InlineStart: {
InlineCallFrame* inlineCallFrame = node.codeOrigin.inlineCallFrame;
int argumentCountIncludingThis = inlineCallFrame->arguments.size();
for (int i = 0; i < argumentCountIncludingThis; ++i) {
ValueRecovery recovery = computeValueRecoveryFor(m_variables[inlineCallFrame->stackOffset + CallFrame::argumentOffsetIncludingThis(i)]);
// The recovery should refer either to something that has already been
// stored into the register file at the right place, or to a constant,
// since the Arguments code isn't smart enough to handle anything else.
// The exception is the this argument, which we don't really need to be
// able to recover.
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("\nRecovery for argument %d: ", i);
recovery.dump(WTF::dataFile());
#endif