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DFGSpeculativeJIT64.cpp
6275 lines (5150 loc) · 239 KB
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DFGSpeculativeJIT64.cpp
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/*
* Copyright (C) 2011-2017 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 "ArrayPrototype.h"
#include "AtomicsObject.h"
#include "CallFrameShuffler.h"
#include "DFGAbstractInterpreterInlines.h"
#include "DFGCallArrayAllocatorSlowPathGenerator.h"
#include "DFGOperations.h"
#include "DFGSlowPathGenerator.h"
#include "DirectArguments.h"
#include "GetterSetter.h"
#include "HasOwnPropertyCache.h"
#include "JSCInlines.h"
#include "JSEnvironmentRecord.h"
#include "JSLexicalEnvironment.h"
#include "JSMap.h"
#include "JSPropertyNameEnumerator.h"
#include "JSSet.h"
#include "ObjectPrototype.h"
#include "SetupVarargsFrame.h"
#include "SpillRegistersMode.h"
#include "StringPrototype.h"
#include "TypeProfilerLog.h"
#include "Watchdog.h"
namespace JSC { namespace DFG {
#if USE(JSVALUE64)
void SpeculativeJIT::boxInt52(GPRReg sourceGPR, GPRReg targetGPR, DataFormat format)
{
GPRReg tempGPR;
if (sourceGPR == targetGPR)
tempGPR = allocate();
else
tempGPR = targetGPR;
FPRReg fpr = fprAllocate();
if (format == DataFormatInt52)
m_jit.rshift64(TrustedImm32(JSValue::int52ShiftAmount), sourceGPR);
else
ASSERT(format == DataFormatStrictInt52);
m_jit.boxInt52(sourceGPR, targetGPR, tempGPR, fpr);
if (format == DataFormatInt52 && sourceGPR != targetGPR)
m_jit.lshift64(TrustedImm32(JSValue::int52ShiftAmount), sourceGPR);
if (tempGPR != targetGPR)
unlock(tempGPR);
unlock(fpr);
}
GPRReg SpeculativeJIT::fillJSValue(Edge edge)
{
VirtualRegister virtualRegister = edge->virtualRegister();
GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
switch (info.registerFormat()) {
case DataFormatNone: {
GPRReg gpr = allocate();
if (edge->hasConstant()) {
JSValue jsValue = edge->asJSValue();
m_jit.move(MacroAssembler::TrustedImm64(JSValue::encode(jsValue)), gpr);
info.fillJSValue(*m_stream, gpr, DataFormatJS);
m_gprs.retain(gpr, virtualRegister, SpillOrderConstant);
} else {
DataFormat spillFormat = info.spillFormat();
m_gprs.retain(gpr, virtualRegister, SpillOrderSpilled);
switch (spillFormat) {
case DataFormatInt32: {
m_jit.load32(JITCompiler::addressFor(virtualRegister), gpr);
m_jit.or64(GPRInfo::tagTypeNumberRegister, gpr);
spillFormat = DataFormatJSInt32;
break;
}
default:
m_jit.load64(JITCompiler::addressFor(virtualRegister), gpr);
DFG_ASSERT(m_jit.graph(), m_currentNode, spillFormat & DataFormatJS);
break;
}
info.fillJSValue(*m_stream, gpr, spillFormat);
}
return gpr;
}
case DataFormatInt32: {
GPRReg gpr = info.gpr();
// If the register has already been locked we need to take a copy.
// If not, we'll zero extend in place, so mark on the info that this is now type DataFormatInt32, not DataFormatJSInt32.
if (m_gprs.isLocked(gpr)) {
GPRReg result = allocate();
m_jit.or64(GPRInfo::tagTypeNumberRegister, gpr, result);
return result;
}
m_gprs.lock(gpr);
m_jit.or64(GPRInfo::tagTypeNumberRegister, gpr);
info.fillJSValue(*m_stream, gpr, DataFormatJSInt32);
return gpr;
}
case DataFormatCell:
// No retag required on JSVALUE64!
case DataFormatJS:
case DataFormatJSInt32:
case DataFormatJSDouble:
case DataFormatJSCell:
case DataFormatJSBoolean: {
GPRReg gpr = info.gpr();
m_gprs.lock(gpr);
return gpr;
}
case DataFormatBoolean:
case DataFormatStorage:
case DataFormatDouble:
case DataFormatInt52:
// this type currently never occurs
DFG_CRASH(m_jit.graph(), m_currentNode, "Bad data format");
default:
DFG_CRASH(m_jit.graph(), m_currentNode, "Corrupt data format");
return InvalidGPRReg;
}
}
void SpeculativeJIT::cachedGetById(CodeOrigin origin, JSValueRegs base, JSValueRegs result, unsigned identifierNumber, JITCompiler::Jump slowPathTarget , SpillRegistersMode mode, AccessType type)
{
cachedGetById(origin, base.gpr(), result.gpr(), identifierNumber, slowPathTarget, mode, type);
}
void SpeculativeJIT::cachedGetById(CodeOrigin codeOrigin, GPRReg baseGPR, GPRReg resultGPR, unsigned identifierNumber, JITCompiler::Jump slowPathTarget, SpillRegistersMode spillMode, AccessType type)
{
CallSiteIndex callSite = m_jit.recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded(codeOrigin, m_stream->size());
RegisterSet usedRegisters = this->usedRegisters();
if (spillMode == DontSpill) {
// We've already flushed registers to the stack, we don't need to spill these.
usedRegisters.set(baseGPR, false);
usedRegisters.set(resultGPR, false);
}
JITGetByIdGenerator gen(
m_jit.codeBlock(), codeOrigin, callSite, usedRegisters, identifierUID(identifierNumber),
JSValueRegs(baseGPR), JSValueRegs(resultGPR), type);
gen.generateFastPath(m_jit);
JITCompiler::JumpList slowCases;
if (slowPathTarget.isSet())
slowCases.append(slowPathTarget);
slowCases.append(gen.slowPathJump());
auto slowPath = slowPathCall(
slowCases, this, type == AccessType::Get ? operationGetByIdOptimize : operationTryGetByIdOptimize,
spillMode, ExceptionCheckRequirement::CheckNeeded,
resultGPR, gen.stubInfo(), baseGPR, identifierUID(identifierNumber));
m_jit.addGetById(gen, slowPath.get());
addSlowPathGenerator(WTFMove(slowPath));
}
void SpeculativeJIT::cachedGetByIdWithThis(CodeOrigin codeOrigin, GPRReg baseGPR, GPRReg thisGPR, GPRReg resultGPR, unsigned identifierNumber, JITCompiler::JumpList slowPathTarget)
{
CallSiteIndex callSite = m_jit.recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded(codeOrigin, m_stream->size());
RegisterSet usedRegisters = this->usedRegisters();
// We've already flushed registers to the stack, we don't need to spill these.
usedRegisters.set(baseGPR, false);
usedRegisters.set(thisGPR, false);
usedRegisters.set(resultGPR, false);
JITGetByIdWithThisGenerator gen(
m_jit.codeBlock(), codeOrigin, callSite, usedRegisters, identifierUID(identifierNumber),
JSValueRegs(resultGPR), JSValueRegs(baseGPR), JSValueRegs(thisGPR), AccessType::GetWithThis);
gen.generateFastPath(m_jit);
JITCompiler::JumpList slowCases;
if (!slowPathTarget.empty())
slowCases.append(slowPathTarget);
slowCases.append(gen.slowPathJump());
auto slowPath = slowPathCall(
slowCases, this, operationGetByIdWithThisOptimize,
DontSpill, ExceptionCheckRequirement::CheckNeeded,
resultGPR, gen.stubInfo(), baseGPR, thisGPR, identifierUID(identifierNumber));
m_jit.addGetByIdWithThis(gen, slowPath.get());
addSlowPathGenerator(WTFMove(slowPath));
}
void SpeculativeJIT::cachedPutById(CodeOrigin codeOrigin, GPRReg baseGPR, GPRReg valueGPR, GPRReg scratchGPR, unsigned identifierNumber, PutKind putKind, JITCompiler::Jump slowPathTarget, SpillRegistersMode spillMode)
{
CallSiteIndex callSite = m_jit.recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded(codeOrigin, m_stream->size());
RegisterSet usedRegisters = this->usedRegisters();
if (spillMode == DontSpill) {
// We've already flushed registers to the stack, we don't need to spill these.
usedRegisters.set(baseGPR, false);
usedRegisters.set(valueGPR, false);
}
JITPutByIdGenerator gen(
m_jit.codeBlock(), codeOrigin, callSite, usedRegisters, JSValueRegs(baseGPR),
JSValueRegs(valueGPR), scratchGPR, m_jit.ecmaModeFor(codeOrigin), putKind);
gen.generateFastPath(m_jit);
JITCompiler::JumpList slowCases;
if (slowPathTarget.isSet())
slowCases.append(slowPathTarget);
slowCases.append(gen.slowPathJump());
auto slowPath = slowPathCall(
slowCases, this, gen.slowPathFunction(), NoResult, gen.stubInfo(), valueGPR, baseGPR,
identifierUID(identifierNumber));
m_jit.addPutById(gen, slowPath.get());
addSlowPathGenerator(WTFMove(slowPath));
}
void SpeculativeJIT::nonSpeculativeNonPeepholeCompareNullOrUndefined(Edge operand)
{
ASSERT_WITH_MESSAGE(!masqueradesAsUndefinedWatchpointIsStillValid() || !isKnownCell(operand.node()), "The Compare should have been eliminated, it is known to be always false.");
JSValueOperand arg(this, operand, ManualOperandSpeculation);
GPRReg argGPR = arg.gpr();
GPRTemporary result(this);
GPRReg resultGPR = result.gpr();
m_jit.move(TrustedImm32(0), resultGPR);
JITCompiler::JumpList done;
if (masqueradesAsUndefinedWatchpointIsStillValid()) {
if (!isKnownNotCell(operand.node()))
done.append(m_jit.branchIfCell(JSValueRegs(argGPR)));
} else {
GPRTemporary localGlobalObject(this);
GPRTemporary remoteGlobalObject(this);
GPRTemporary scratch(this);
JITCompiler::Jump notCell;
if (!isKnownCell(operand.node()))
notCell = m_jit.branchIfNotCell(JSValueRegs(argGPR));
JITCompiler::Jump isNotMasqueradesAsUndefined = m_jit.branchTest8(
JITCompiler::Zero,
JITCompiler::Address(argGPR, JSCell::typeInfoFlagsOffset()),
JITCompiler::TrustedImm32(MasqueradesAsUndefined));
done.append(isNotMasqueradesAsUndefined);
GPRReg localGlobalObjectGPR = localGlobalObject.gpr();
GPRReg remoteGlobalObjectGPR = remoteGlobalObject.gpr();
m_jit.move(TrustedImmPtr::weakPointer(m_jit.graph(), m_jit.graph().globalObjectFor(m_currentNode->origin.semantic)), localGlobalObjectGPR);
m_jit.emitLoadStructure(*m_jit.vm(), argGPR, resultGPR, scratch.gpr());
m_jit.loadPtr(JITCompiler::Address(resultGPR, Structure::globalObjectOffset()), remoteGlobalObjectGPR);
m_jit.comparePtr(JITCompiler::Equal, localGlobalObjectGPR, remoteGlobalObjectGPR, resultGPR);
done.append(m_jit.jump());
if (!isKnownCell(operand.node()))
notCell.link(&m_jit);
}
if (!isKnownNotOther(operand.node())) {
m_jit.move(argGPR, resultGPR);
m_jit.and64(JITCompiler::TrustedImm32(~TagBitUndefined), resultGPR);
m_jit.compare64(JITCompiler::Equal, resultGPR, JITCompiler::TrustedImm32(ValueNull), resultGPR);
}
done.link(&m_jit);
m_jit.or32(TrustedImm32(ValueFalse), resultGPR);
jsValueResult(resultGPR, m_currentNode, DataFormatJSBoolean);
}
void SpeculativeJIT::nonSpeculativePeepholeBranchNullOrUndefined(Edge operand, Node* branchNode)
{
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
JSValueOperand arg(this, operand, ManualOperandSpeculation);
GPRReg argGPR = arg.gpr();
GPRTemporary result(this, Reuse, arg);
GPRReg resultGPR = result.gpr();
// First, handle the case where "operand" is a cell.
if (masqueradesAsUndefinedWatchpointIsStillValid()) {
if (!isKnownNotCell(operand.node())) {
JITCompiler::Jump isCell = m_jit.branchIfCell(JSValueRegs(argGPR));
addBranch(isCell, notTaken);
}
} else {
GPRTemporary localGlobalObject(this);
GPRTemporary remoteGlobalObject(this);
GPRTemporary scratch(this);
JITCompiler::Jump notCell;
if (!isKnownCell(operand.node()))
notCell = m_jit.branchIfNotCell(JSValueRegs(argGPR));
branchTest8(JITCompiler::Zero,
JITCompiler::Address(argGPR, JSCell::typeInfoFlagsOffset()),
JITCompiler::TrustedImm32(MasqueradesAsUndefined), notTaken);
GPRReg localGlobalObjectGPR = localGlobalObject.gpr();
GPRReg remoteGlobalObjectGPR = remoteGlobalObject.gpr();
m_jit.move(TrustedImmPtr::weakPointer(m_jit.graph(), m_jit.graph().globalObjectFor(m_currentNode->origin.semantic)), localGlobalObjectGPR);
m_jit.emitLoadStructure(*m_jit.vm(), argGPR, resultGPR, scratch.gpr());
m_jit.loadPtr(JITCompiler::Address(resultGPR, Structure::globalObjectOffset()), remoteGlobalObjectGPR);
branchPtr(JITCompiler::Equal, localGlobalObjectGPR, remoteGlobalObjectGPR, taken);
if (!isKnownCell(operand.node())) {
jump(notTaken, ForceJump);
notCell.link(&m_jit);
}
}
if (isKnownNotOther(operand.node()))
jump(notTaken);
else {
JITCompiler::RelationalCondition condition = JITCompiler::Equal;
if (taken == nextBlock()) {
condition = JITCompiler::NotEqual;
std::swap(taken, notTaken);
}
m_jit.move(argGPR, resultGPR);
m_jit.and64(JITCompiler::TrustedImm32(~TagBitUndefined), resultGPR);
branch64(condition, resultGPR, JITCompiler::TrustedImm64(ValueNull), taken);
jump(notTaken);
}
}
void SpeculativeJIT::nonSpeculativePeepholeBranch(Node* node, Node* branchNode, MacroAssembler::RelationalCondition cond, S_JITOperation_EJJ helperFunction)
{
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
JITCompiler::ResultCondition callResultCondition = JITCompiler::NonZero;
// 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 == nextBlock()) {
cond = JITCompiler::invert(cond);
callResultCondition = JITCompiler::Zero;
BasicBlock* tmp = taken;
taken = notTaken;
notTaken = tmp;
}
JSValueOperand arg1(this, node->child1());
JSValueOperand arg2(this, node->child2());
GPRReg arg1GPR = arg1.gpr();
GPRReg arg2GPR = arg2.gpr();
JITCompiler::JumpList slowPath;
if (isKnownNotInteger(node->child1().node()) || isKnownNotInteger(node->child2().node())) {
GPRFlushedCallResult result(this);
GPRReg resultGPR = result.gpr();
arg1.use();
arg2.use();
flushRegisters();
callOperation(helperFunction, resultGPR, arg1GPR, arg2GPR);
m_jit.exceptionCheck();
branchTest32(callResultCondition, resultGPR, taken);
} else {
GPRTemporary result(this, Reuse, arg2);
GPRReg resultGPR = result.gpr();
arg1.use();
arg2.use();
if (!isKnownInteger(node->child1().node()))
slowPath.append(m_jit.branch64(MacroAssembler::Below, arg1GPR, GPRInfo::tagTypeNumberRegister));
if (!isKnownInteger(node->child2().node()))
slowPath.append(m_jit.branch64(MacroAssembler::Below, arg2GPR, GPRInfo::tagTypeNumberRegister));
branch32(cond, arg1GPR, arg2GPR, taken);
if (!isKnownInteger(node->child1().node()) || !isKnownInteger(node->child2().node())) {
jump(notTaken, ForceJump);
slowPath.link(&m_jit);
silentSpillAllRegisters(resultGPR);
callOperation(helperFunction, resultGPR, arg1GPR, arg2GPR);
silentFillAllRegisters();
m_jit.exceptionCheck();
branchTest32(callResultCondition, resultGPR, taken);
}
}
jump(notTaken);
m_indexInBlock = m_block->size() - 1;
m_currentNode = branchNode;
}
template<typename JumpType>
class CompareAndBoxBooleanSlowPathGenerator
: public CallSlowPathGenerator<JumpType, S_JITOperation_EJJ, GPRReg> {
public:
CompareAndBoxBooleanSlowPathGenerator(
JumpType from, SpeculativeJIT* jit,
S_JITOperation_EJJ function, GPRReg result, GPRReg arg1, GPRReg arg2)
: CallSlowPathGenerator<JumpType, S_JITOperation_EJJ, GPRReg>(
from, jit, function, NeedToSpill, ExceptionCheckRequirement::CheckNeeded, result)
, m_arg1(arg1)
, m_arg2(arg2)
{
}
protected:
void generateInternal(SpeculativeJIT* jit) override
{
this->setUp(jit);
this->recordCall(jit->callOperation(this->m_function, this->m_result, m_arg1, m_arg2));
jit->m_jit.and32(JITCompiler::TrustedImm32(1), this->m_result);
jit->m_jit.or32(JITCompiler::TrustedImm32(ValueFalse), this->m_result);
this->tearDown(jit);
}
private:
GPRReg m_arg1;
GPRReg m_arg2;
};
void SpeculativeJIT::nonSpeculativeNonPeepholeCompare(Node* node, MacroAssembler::RelationalCondition cond, S_JITOperation_EJJ helperFunction)
{
ASSERT(node->isBinaryUseKind(UntypedUse));
JSValueOperand arg1(this, node->child1());
JSValueOperand arg2(this, node->child2());
GPRReg arg1GPR = arg1.gpr();
GPRReg arg2GPR = arg2.gpr();
JITCompiler::JumpList slowPath;
if (isKnownNotInteger(node->child1().node()) || isKnownNotInteger(node->child2().node())) {
GPRFlushedCallResult result(this);
GPRReg resultGPR = result.gpr();
arg1.use();
arg2.use();
flushRegisters();
callOperation(helperFunction, resultGPR, arg1GPR, arg2GPR);
m_jit.exceptionCheck();
m_jit.or32(TrustedImm32(ValueFalse), resultGPR);
jsValueResult(resultGPR, m_currentNode, DataFormatJSBoolean, UseChildrenCalledExplicitly);
} else {
GPRTemporary result(this, Reuse, arg2);
GPRReg resultGPR = result.gpr();
arg1.use();
arg2.use();
if (!isKnownInteger(node->child1().node()))
slowPath.append(m_jit.branch64(MacroAssembler::Below, arg1GPR, GPRInfo::tagTypeNumberRegister));
if (!isKnownInteger(node->child2().node()))
slowPath.append(m_jit.branch64(MacroAssembler::Below, arg2GPR, GPRInfo::tagTypeNumberRegister));
m_jit.compare32(cond, arg1GPR, arg2GPR, resultGPR);
m_jit.or32(TrustedImm32(ValueFalse), resultGPR);
if (!isKnownInteger(node->child1().node()) || !isKnownInteger(node->child2().node())) {
addSlowPathGenerator(std::make_unique<CompareAndBoxBooleanSlowPathGenerator<JITCompiler::JumpList>>(
slowPath, this, helperFunction, resultGPR, arg1GPR, arg2GPR));
}
jsValueResult(resultGPR, m_currentNode, DataFormatJSBoolean, UseChildrenCalledExplicitly);
}
}
void SpeculativeJIT::nonSpeculativePeepholeStrictEq(Node* node, Node* branchNode, bool invert)
{
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
// 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 == nextBlock()) {
invert = !invert;
BasicBlock* tmp = taken;
taken = notTaken;
notTaken = tmp;
}
JSValueOperand arg1(this, node->child1());
JSValueOperand arg2(this, node->child2());
GPRReg arg1GPR = arg1.gpr();
GPRReg arg2GPR = arg2.gpr();
GPRTemporary result(this);
GPRReg resultGPR = result.gpr();
arg1.use();
arg2.use();
if (isKnownCell(node->child1().node()) && isKnownCell(node->child2().node())) {
// see if we get lucky: if the arguments are cells and they reference the same
// cell, then they must be strictly equal.
branch64(JITCompiler::Equal, arg1GPR, arg2GPR, invert ? notTaken : taken);
silentSpillAllRegisters(resultGPR);
callOperation(operationCompareStrictEqCell, resultGPR, arg1GPR, arg2GPR);
silentFillAllRegisters();
m_jit.exceptionCheck();
branchTest32(invert ? JITCompiler::Zero : JITCompiler::NonZero, resultGPR, taken);
} else {
m_jit.or64(arg1GPR, arg2GPR, resultGPR);
JITCompiler::Jump twoCellsCase = m_jit.branchTest64(JITCompiler::Zero, resultGPR, GPRInfo::tagMaskRegister);
JITCompiler::Jump leftOK = m_jit.branch64(JITCompiler::AboveOrEqual, arg1GPR, GPRInfo::tagTypeNumberRegister);
JITCompiler::Jump leftDouble = m_jit.branchTest64(JITCompiler::NonZero, arg1GPR, GPRInfo::tagTypeNumberRegister);
leftOK.link(&m_jit);
JITCompiler::Jump rightOK = m_jit.branch64(JITCompiler::AboveOrEqual, arg2GPR, GPRInfo::tagTypeNumberRegister);
JITCompiler::Jump rightDouble = m_jit.branchTest64(JITCompiler::NonZero, arg2GPR, GPRInfo::tagTypeNumberRegister);
rightOK.link(&m_jit);
branch64(invert ? JITCompiler::NotEqual : JITCompiler::Equal, arg1GPR, arg2GPR, taken);
jump(notTaken, ForceJump);
twoCellsCase.link(&m_jit);
branch64(JITCompiler::Equal, arg1GPR, arg2GPR, invert ? notTaken : taken);
leftDouble.link(&m_jit);
rightDouble.link(&m_jit);
silentSpillAllRegisters(resultGPR);
callOperation(operationCompareStrictEq, resultGPR, arg1GPR, arg2GPR);
silentFillAllRegisters();
m_jit.exceptionCheck();
branchTest32(invert ? JITCompiler::Zero : JITCompiler::NonZero, resultGPR, taken);
}
jump(notTaken);
}
void SpeculativeJIT::nonSpeculativeNonPeepholeStrictEq(Node* node, bool invert)
{
JSValueOperand arg1(this, node->child1());
JSValueOperand arg2(this, node->child2());
GPRReg arg1GPR = arg1.gpr();
GPRReg arg2GPR = arg2.gpr();
GPRTemporary result(this);
GPRReg resultGPR = result.gpr();
arg1.use();
arg2.use();
if (isKnownCell(node->child1().node()) && isKnownCell(node->child2().node())) {
// see if we get lucky: if the arguments are cells and they reference the same
// cell, then they must be strictly equal.
// FIXME: this should flush registers instead of silent spill/fill.
JITCompiler::Jump notEqualCase = m_jit.branch64(JITCompiler::NotEqual, arg1GPR, arg2GPR);
m_jit.move(JITCompiler::TrustedImm64(JSValue::encode(jsBoolean(!invert))), resultGPR);
JITCompiler::Jump done = m_jit.jump();
notEqualCase.link(&m_jit);
silentSpillAllRegisters(resultGPR);
callOperation(operationCompareStrictEqCell, resultGPR, arg1GPR, arg2GPR);
silentFillAllRegisters();
m_jit.exceptionCheck();
m_jit.and64(JITCompiler::TrustedImm32(1), resultGPR);
m_jit.or32(JITCompiler::TrustedImm32(ValueFalse), resultGPR);
done.link(&m_jit);
} else {
m_jit.or64(arg1GPR, arg2GPR, resultGPR);
JITCompiler::JumpList slowPathCases;
JITCompiler::Jump twoCellsCase = m_jit.branchTest64(JITCompiler::Zero, resultGPR, GPRInfo::tagMaskRegister);
JITCompiler::Jump leftOK = m_jit.branch64(JITCompiler::AboveOrEqual, arg1GPR, GPRInfo::tagTypeNumberRegister);
slowPathCases.append(m_jit.branchTest64(JITCompiler::NonZero, arg1GPR, GPRInfo::tagTypeNumberRegister));
leftOK.link(&m_jit);
JITCompiler::Jump rightOK = m_jit.branch64(JITCompiler::AboveOrEqual, arg2GPR, GPRInfo::tagTypeNumberRegister);
slowPathCases.append(m_jit.branchTest64(JITCompiler::NonZero, arg2GPR, GPRInfo::tagTypeNumberRegister));
rightOK.link(&m_jit);
m_jit.compare64(invert ? JITCompiler::NotEqual : JITCompiler::Equal, arg1GPR, arg2GPR, resultGPR);
m_jit.or32(JITCompiler::TrustedImm32(ValueFalse), resultGPR);
JITCompiler::Jump done = m_jit.jump();
twoCellsCase.link(&m_jit);
slowPathCases.append(m_jit.branch64(JITCompiler::NotEqual, arg1GPR, arg2GPR));
m_jit.move(JITCompiler::TrustedImm64(JSValue::encode(jsBoolean(!invert))), resultGPR);
addSlowPathGenerator(std::make_unique<CompareAndBoxBooleanSlowPathGenerator<MacroAssembler::JumpList>>(
slowPathCases, this, operationCompareStrictEq, resultGPR, arg1GPR,
arg2GPR));
done.link(&m_jit);
}
jsValueResult(resultGPR, m_currentNode, DataFormatJSBoolean, UseChildrenCalledExplicitly);
}
void SpeculativeJIT::compileMiscStrictEq(Node* node)
{
JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
JSValueOperand op2(this, node->child2(), ManualOperandSpeculation);
GPRTemporary result(this);
if (node->child1().useKind() == MiscUse)
speculateMisc(node->child1(), op1.jsValueRegs());
if (node->child2().useKind() == MiscUse)
speculateMisc(node->child2(), op2.jsValueRegs());
m_jit.compare64(JITCompiler::Equal, op1.gpr(), op2.gpr(), result.gpr());
m_jit.or32(TrustedImm32(ValueFalse), result.gpr());
jsValueResult(result.gpr(), node, DataFormatJSBoolean);
}
void SpeculativeJIT::emitCall(Node* node)
{
CallLinkInfo::CallType callType;
bool isVarargs = false;
bool isForwardVarargs = false;
bool isTail = false;
bool isEmulatedTail = false;
bool isDirect = false;
switch (node->op()) {
case Call:
case CallEval:
callType = CallLinkInfo::Call;
break;
case TailCall:
callType = CallLinkInfo::TailCall;
isTail = true;
break;
case TailCallInlinedCaller:
callType = CallLinkInfo::Call;
isEmulatedTail = true;
break;
case Construct:
callType = CallLinkInfo::Construct;
break;
case CallVarargs:
callType = CallLinkInfo::CallVarargs;
isVarargs = true;
break;
case TailCallVarargs:
callType = CallLinkInfo::TailCallVarargs;
isVarargs = true;
isTail = true;
break;
case TailCallVarargsInlinedCaller:
callType = CallLinkInfo::CallVarargs;
isVarargs = true;
isEmulatedTail = true;
break;
case ConstructVarargs:
callType = CallLinkInfo::ConstructVarargs;
isVarargs = true;
break;
case CallForwardVarargs:
callType = CallLinkInfo::CallVarargs;
isForwardVarargs = true;
break;
case ConstructForwardVarargs:
callType = CallLinkInfo::ConstructVarargs;
isForwardVarargs = true;
break;
case TailCallForwardVarargs:
callType = CallLinkInfo::TailCallVarargs;
isTail = true;
isForwardVarargs = true;
break;
case TailCallForwardVarargsInlinedCaller:
callType = CallLinkInfo::CallVarargs;
isEmulatedTail = true;
isForwardVarargs = true;
break;
case DirectCall:
callType = CallLinkInfo::DirectCall;
isDirect = true;
break;
case DirectConstruct:
callType = CallLinkInfo::DirectConstruct;
isDirect = true;
break;
case DirectTailCall:
callType = CallLinkInfo::DirectTailCall;
isTail = true;
isDirect = true;
break;
case DirectTailCallInlinedCaller:
callType = CallLinkInfo::DirectCall;
isEmulatedTail = true;
isDirect = true;
break;
default:
DFG_CRASH(m_jit.graph(), node, "bad node type");
break;
}
GPRReg calleeGPR = InvalidGPRReg;
CallFrameShuffleData shuffleData;
ExecutableBase* executable = nullptr;
FunctionExecutable* functionExecutable = nullptr;
if (isDirect) {
executable = node->castOperand<ExecutableBase*>();
functionExecutable = jsDynamicCast<FunctionExecutable*>(*m_jit.vm(), executable);
}
unsigned numPassedArgs = 0;
unsigned numAllocatedArgs = 0;
// Gotta load the arguments somehow. Varargs is trickier.
if (isVarargs || isForwardVarargs) {
RELEASE_ASSERT(!isDirect);
CallVarargsData* data = node->callVarargsData();
unsigned numUsedStackSlots = m_jit.graph().m_nextMachineLocal;
if (isForwardVarargs) {
flushRegisters();
if (node->child3())
use(node->child3());
GPRReg scratchGPR1;
GPRReg scratchGPR2;
GPRReg scratchGPR3;
scratchGPR1 = JITCompiler::selectScratchGPR();
scratchGPR2 = JITCompiler::selectScratchGPR(scratchGPR1);
scratchGPR3 = JITCompiler::selectScratchGPR(scratchGPR1, scratchGPR2);
m_jit.move(TrustedImm32(numUsedStackSlots), scratchGPR2);
JITCompiler::JumpList slowCase;
InlineCallFrame* inlineCallFrame;
if (node->child3())
inlineCallFrame = node->child3()->origin.semantic.inlineCallFrame;
else
inlineCallFrame = node->origin.semantic.inlineCallFrame;
// emitSetupVarargsFrameFastCase modifies the stack pointer if it succeeds.
emitSetupVarargsFrameFastCase(*m_jit.vm(), m_jit, scratchGPR2, scratchGPR1, scratchGPR2, scratchGPR3, inlineCallFrame, data->firstVarArgOffset, slowCase);
JITCompiler::Jump done = m_jit.jump();
slowCase.link(&m_jit);
callOperation(operationThrowStackOverflowForVarargs);
m_jit.exceptionCheck();
m_jit.abortWithReason(DFGVarargsThrowingPathDidNotThrow);
done.link(&m_jit);
} else {
GPRReg argumentsGPR;
GPRReg scratchGPR1;
GPRReg scratchGPR2;
GPRReg scratchGPR3;
auto loadArgumentsGPR = [&] (GPRReg reservedGPR) {
if (reservedGPR != InvalidGPRReg)
lock(reservedGPR);
JSValueOperand arguments(this, node->child3());
argumentsGPR = arguments.gpr();
if (reservedGPR != InvalidGPRReg)
unlock(reservedGPR);
flushRegisters();
scratchGPR1 = JITCompiler::selectScratchGPR(argumentsGPR, reservedGPR);
scratchGPR2 = JITCompiler::selectScratchGPR(argumentsGPR, scratchGPR1, reservedGPR);
scratchGPR3 = JITCompiler::selectScratchGPR(argumentsGPR, scratchGPR1, scratchGPR2, reservedGPR);
};
loadArgumentsGPR(InvalidGPRReg);
DFG_ASSERT(m_jit.graph(), node, isFlushed());
// Right now, arguments is in argumentsGPR and the register file is flushed.
callOperation(operationSizeFrameForVarargs, GPRInfo::returnValueGPR, argumentsGPR, numUsedStackSlots, data->firstVarArgOffset);
m_jit.exceptionCheck();
// Now we have the argument count of the callee frame, but we've lost the arguments operand.
// Reconstruct the arguments operand while preserving the callee frame.
loadArgumentsGPR(GPRInfo::returnValueGPR);
m_jit.move(TrustedImm32(numUsedStackSlots), scratchGPR1);
emitSetVarargsFrame(m_jit, GPRInfo::returnValueGPR, false, scratchGPR1, scratchGPR1);
m_jit.addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 5 * sizeof(void*)))), scratchGPR1, JITCompiler::stackPointerRegister);
callOperation(operationSetupVarargsFrame, GPRInfo::returnValueGPR, scratchGPR1, argumentsGPR, data->firstVarArgOffset, GPRInfo::returnValueGPR);
m_jit.exceptionCheck();
m_jit.addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), GPRInfo::returnValueGPR, JITCompiler::stackPointerRegister);
}
DFG_ASSERT(m_jit.graph(), node, isFlushed());
// We don't need the arguments array anymore.
if (isVarargs)
use(node->child3());
// Now set up the "this" argument.
JSValueOperand thisArgument(this, node->child2());
GPRReg thisArgumentGPR = thisArgument.gpr();
thisArgument.use();
m_jit.store64(thisArgumentGPR, JITCompiler::calleeArgumentSlot(0));
} else {
// The call instruction's first child is the function; the subsequent children are the
// arguments.
numPassedArgs = node->numChildren() - 1;
numAllocatedArgs = numPassedArgs;
if (functionExecutable) {
// Allocate more args if this would let us avoid arity checks. This is throttled by
// CallLinkInfo's limit. It's probably good to throttle it - if the callee wants a
// ginormous amount of argument space then it's better for them to do it so that when we
// make calls to other things, we don't waste space.
unsigned desiredNumAllocatedArgs = static_cast<unsigned>(functionExecutable->parameterCount()) + 1;
if (desiredNumAllocatedArgs <= Options::maximumDirectCallStackSize()) {
numAllocatedArgs = std::max(numAllocatedArgs, desiredNumAllocatedArgs);
// Whoever converts to DirectCall should do this adjustment. It's too late for us to
// do this adjustment now since we will have already emitted code that relied on the
// value of m_parameterSlots.
DFG_ASSERT(
m_jit.graph(), node,
Graph::parameterSlotsForArgCount(numAllocatedArgs)
<= m_jit.graph().m_parameterSlots);
}
}
if (isTail) {
Edge calleeEdge = m_jit.graph().child(node, 0);
JSValueOperand callee(this, calleeEdge);
calleeGPR = callee.gpr();
if (!isDirect)
callee.use();
shuffleData.tagTypeNumber = GPRInfo::tagTypeNumberRegister;
shuffleData.numLocals = m_jit.graph().frameRegisterCount();
shuffleData.callee = ValueRecovery::inGPR(calleeGPR, DataFormatJS);
shuffleData.args.resize(numAllocatedArgs);
shuffleData.numPassedArgs = numPassedArgs;
for (unsigned i = 0; i < numPassedArgs; ++i) {
Edge argEdge = m_jit.graph().varArgChild(node, i + 1);
GenerationInfo& info = generationInfo(argEdge.node());
if (!isDirect)
use(argEdge);
shuffleData.args[i] = info.recovery(argEdge->virtualRegister());
}
for (unsigned i = numPassedArgs; i < numAllocatedArgs; ++i)
shuffleData.args[i] = ValueRecovery::constant(jsUndefined());
shuffleData.setupCalleeSaveRegisters(m_jit.codeBlock());
} else {
m_jit.store32(MacroAssembler::TrustedImm32(numPassedArgs), JITCompiler::calleeFramePayloadSlot(CallFrameSlot::argumentCount));
for (unsigned i = 0; i < numPassedArgs; i++) {
Edge argEdge = m_jit.graph().m_varArgChildren[node->firstChild() + 1 + i];
JSValueOperand arg(this, argEdge);
GPRReg argGPR = arg.gpr();
use(argEdge);
m_jit.store64(argGPR, JITCompiler::calleeArgumentSlot(i));
}
for (unsigned i = numPassedArgs; i < numAllocatedArgs; ++i)
m_jit.storeTrustedValue(jsUndefined(), JITCompiler::calleeArgumentSlot(i));
}
}
if (!isTail || isVarargs || isForwardVarargs) {
Edge calleeEdge = m_jit.graph().child(node, 0);
JSValueOperand callee(this, calleeEdge);
calleeGPR = callee.gpr();
callee.use();
m_jit.store64(calleeGPR, JITCompiler::calleeFrameSlot(CallFrameSlot::callee));
flushRegisters();
}
CodeOrigin staticOrigin = node->origin.semantic;
ASSERT(!isTail || !staticOrigin.inlineCallFrame || !staticOrigin.inlineCallFrame->getCallerSkippingTailCalls());
ASSERT(!isEmulatedTail || (staticOrigin.inlineCallFrame && staticOrigin.inlineCallFrame->getCallerSkippingTailCalls()));
CodeOrigin dynamicOrigin =
isEmulatedTail ? *staticOrigin.inlineCallFrame->getCallerSkippingTailCalls() : staticOrigin;
CallSiteIndex callSite = m_jit.recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded(dynamicOrigin, m_stream->size());
auto setResultAndResetStack = [&] () {
GPRFlushedCallResult result(this);
GPRReg resultGPR = result.gpr();
m_jit.move(GPRInfo::returnValueGPR, resultGPR);
jsValueResult(resultGPR, m_currentNode, DataFormatJS, UseChildrenCalledExplicitly);
// After the calls are done, we need to reestablish our stack
// pointer. We rely on this for varargs calls, calls with arity
// mismatch (the callframe is slided) and tail calls.
m_jit.addPtr(TrustedImm32(m_jit.graph().stackPointerOffset() * sizeof(Register)), GPRInfo::callFrameRegister, JITCompiler::stackPointerRegister);
};
CallLinkInfo* callLinkInfo = m_jit.codeBlock()->addCallLinkInfo();
callLinkInfo->setUpCall(callType, m_currentNode->origin.semantic, calleeGPR);
if (node->op() == CallEval) {
// We want to call operationCallEval but we don't want to overwrite the parameter area in
// which we have created a prototypical eval call frame. This means that we have to
// subtract stack to make room for the call. Lucky for us, at this point we have the whole
// register file to ourselves.
m_jit.emitStoreCallSiteIndex(callSite);
m_jit.addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), JITCompiler::stackPointerRegister, GPRInfo::regT0);
m_jit.storePtr(GPRInfo::callFrameRegister, JITCompiler::Address(GPRInfo::regT0, CallFrame::callerFrameOffset()));
// Now we need to make room for:
// - The caller frame and PC of a call to operationCallEval.
// - Potentially two arguments on the stack.
unsigned requiredBytes = sizeof(CallerFrameAndPC) + sizeof(ExecState*) * 2;
requiredBytes = WTF::roundUpToMultipleOf(stackAlignmentBytes(), requiredBytes);
m_jit.subPtr(TrustedImm32(requiredBytes), JITCompiler::stackPointerRegister);
m_jit.setupArgumentsWithExecState(GPRInfo::regT0);
prepareForExternalCall();
m_jit.appendCall(operationCallEval);
m_jit.exceptionCheck();
JITCompiler::Jump done = m_jit.branchTest64(JITCompiler::NonZero, GPRInfo::returnValueGPR);
// This is the part where we meant to make a normal call. Oops.
m_jit.addPtr(TrustedImm32(requiredBytes), JITCompiler::stackPointerRegister);
m_jit.load64(JITCompiler::calleeFrameSlot(CallFrameSlot::callee), GPRInfo::regT0);
m_jit.emitDumbVirtualCall(*m_jit.vm(), callLinkInfo);
done.link(&m_jit);
setResultAndResetStack();
return;
}
if (isDirect) {
callLinkInfo->setExecutableDuringCompilation(executable);
callLinkInfo->setMaxNumArguments(numAllocatedArgs);
if (isTail) {
RELEASE_ASSERT(node->op() == DirectTailCall);
JITCompiler::PatchableJump patchableJump = m_jit.patchableJump();
JITCompiler::Label mainPath = m_jit.label();
m_jit.emitStoreCallSiteIndex(callSite);
callLinkInfo->setFrameShuffleData(shuffleData);
CallFrameShuffler(m_jit, shuffleData).prepareForTailCall();
JITCompiler::Call call = m_jit.nearTailCall();
JITCompiler::Label slowPath = m_jit.label();
patchableJump.m_jump.linkTo(slowPath, &m_jit);
silentSpillAllRegisters(InvalidGPRReg);
callOperation(operationLinkDirectCall, callLinkInfo, calleeGPR);
silentFillAllRegisters();
m_jit.exceptionCheck();
m_jit.jump().linkTo(mainPath, &m_jit);