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cobalt / cobalt / e77c070364e97b7a7deea396227c08805cb9e66d / . / src / third_party / WebKit / Source / JavaScriptCore / dfg / DFGByteCodeParser.cpp
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/*
* Copyright (C) 2011, 2012 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 "DFGByteCodeParser.h"
#if ENABLE(DFG_JIT)
#include "ArrayConstructor.h"
#include "CallLinkStatus.h"
#include "CodeBlock.h"
#include "DFGArrayMode.h"
#include "DFGByteCodeCache.h"
#include "DFGCapabilities.h"
#include "GetByIdStatus.h"
#include "PutByIdStatus.h"
#include "ResolveGlobalStatus.h"
#include <wtf/HashMap.h>
#include <wtf/MathExtras.h>
namespace JSC { namespace DFG {
class ConstantBufferKey {
public:
ConstantBufferKey()
: m_codeBlock(0)
, m_index(0)
{
}
ConstantBufferKey(WTF::HashTableDeletedValueType)
: m_codeBlock(0)
, m_index(1)
{
}
ConstantBufferKey(CodeBlock* codeBlock, unsigned index)
: m_codeBlock(codeBlock)
, m_index(index)
{
}
bool operator==(const ConstantBufferKey& other) const
{
return m_codeBlock == other.m_codeBlock
&& m_index == other.m_index;
}
unsigned hash() const
{
return WTF::PtrHash<CodeBlock*>::hash(m_codeBlock) ^ m_index;
}
bool isHashTableDeletedValue() const
{
return !m_codeBlock && m_index;
}
CodeBlock* codeBlock() const { return m_codeBlock; }
unsigned index() const { return m_index; }
private:
CodeBlock* m_codeBlock;
unsigned m_index;
};
struct ConstantBufferKeyHash {
static unsigned hash(const ConstantBufferKey& key) { return key.hash(); }
static bool equal(const ConstantBufferKey& a, const ConstantBufferKey& b)
{
return a == b;
}
static const bool safeToCompareToEmptyOrDeleted = true;
};
} } // namespace JSC::DFG
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::DFG::ConstantBufferKey> {
typedef JSC::DFG::ConstantBufferKeyHash Hash;
};
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::DFG::ConstantBufferKey> : SimpleClassHashTraits<JSC::DFG::ConstantBufferKey> { };
} // namespace WTF
namespace JSC { namespace DFG {
// === ByteCodeParser ===
//
// This class is used to compile the dataflow graph from a CodeBlock.
class ByteCodeParser {
public:
ByteCodeParser(ExecState* exec, Graph& graph)
: m_exec(exec)
, m_globalData(&graph.m_globalData)
, m_codeBlock(graph.m_codeBlock)
, m_profiledBlock(graph.m_profiledBlock)
, m_graph(graph)
, m_currentBlock(0)
, m_currentIndex(0)
, m_currentProfilingIndex(0)
, m_constantUndefined(UINT_MAX)
, m_constantNull(UINT_MAX)
, m_constantNaN(UINT_MAX)
, m_constant1(UINT_MAX)
, m_constants(m_codeBlock->numberOfConstantRegisters())
, m_numArguments(m_codeBlock->numParameters())
, m_numLocals(m_codeBlock->m_numCalleeRegisters)
, m_preservedVars(m_codeBlock->m_numVars)
, m_parameterSlots(0)
, m_numPassedVarArgs(0)
, m_globalResolveNumber(0)
, m_inlineStackTop(0)
, m_haveBuiltOperandMaps(false)
, m_emptyJSValueIndex(UINT_MAX)
, m_currentInstruction(0)
{
ASSERT(m_profiledBlock);
for (int i = 0; i < m_codeBlock->m_numVars; ++i)
m_preservedVars.set(i);
}
// Parse a full CodeBlock of bytecode.
bool parse();
private:
// Just parse from m_currentIndex to the end of the current CodeBlock.
void parseCodeBlock();
// Helper for min and max.
bool handleMinMax(bool usesResult, int resultOperand, NodeType op, int registerOffset, int argumentCountIncludingThis);
// Handle calls. This resolves issues surrounding inlining and intrinsics.
void handleCall(Interpreter*, Instruction* currentInstruction, NodeType op, CodeSpecializationKind);
void emitFunctionCheck(JSFunction* expectedFunction, NodeIndex callTarget, int registerOffset, CodeSpecializationKind);
// Handle inlining. Return true if it succeeded, false if we need to plant a call.
bool handleInlining(bool usesResult, int callTarget, NodeIndex callTargetNodeIndex, int resultOperand, bool certainAboutExpectedFunction, JSFunction*, int registerOffset, int argumentCountIncludingThis, unsigned nextOffset, CodeSpecializationKind);
// Handle setting the result of an intrinsic.
void setIntrinsicResult(bool usesResult, int resultOperand, NodeIndex);
// Handle intrinsic functions. Return true if it succeeded, false if we need to plant a call.
bool handleIntrinsic(bool usesResult, int resultOperand, Intrinsic, int registerOffset, int argumentCountIncludingThis, SpeculatedType prediction);
bool handleConstantInternalFunction(bool usesResult, int resultOperand, InternalFunction*, int registerOffset, int argumentCountIncludingThis, SpeculatedType prediction, CodeSpecializationKind);
NodeIndex handleGetByOffset(SpeculatedType, NodeIndex base, unsigned identifierNumber, PropertyOffset);
void handleGetByOffset(
int destinationOperand, SpeculatedType, NodeIndex base, unsigned identifierNumber,
PropertyOffset);
void handleGetById(
int destinationOperand, SpeculatedType, NodeIndex base, unsigned identifierNumber,
const GetByIdStatus&);
NodeIndex getScope(bool skipTop, unsigned skipCount);
// Convert a set of ResolveOperations into graph nodes
bool parseResolveOperations(SpeculatedType, unsigned identifierNumber, unsigned operations, unsigned putToBaseOperation, NodeIndex* base, NodeIndex* value);
// Prepare to parse a block.
void prepareToParseBlock();
// Parse a single basic block of bytecode instructions.
bool parseBlock(unsigned limit);
// Link block successors.
void linkBlock(BasicBlock*, Vector<BlockIndex>& possibleTargets);
void linkBlocks(Vector<UnlinkedBlock>& unlinkedBlocks, Vector<BlockIndex>& possibleTargets);
// Link GetLocal & SetLocal nodes, to ensure live values are generated.
enum PhiStackType {
LocalPhiStack,
ArgumentPhiStack
};
template<PhiStackType stackType>
void processPhiStack();
void fixVariableAccessPredictions();
// Add spill locations to nodes.
void allocateVirtualRegisters();
VariableAccessData* newVariableAccessData(int operand, bool isCaptured)
{
ASSERT(operand < FirstConstantRegisterIndex);
m_graph.m_variableAccessData.append(VariableAccessData(static_cast<VirtualRegister>(operand), isCaptured));
return &m_graph.m_variableAccessData.last();
}
// Get/Set the operands/result of a bytecode instruction.
NodeIndex getDirect(int operand)
{
// Is this a constant?
if (operand >= FirstConstantRegisterIndex) {
unsigned constant = operand - FirstConstantRegisterIndex;
ASSERT(constant < m_constants.size());
return getJSConstant(constant);
}
if (operand == JSStack::Callee)
return getCallee();
// Is this an argument?
if (operandIsArgument(operand))
return getArgument(operand);
// Must be a local.
return getLocal((unsigned)operand);
}
NodeIndex get(int operand)
{
return getDirect(m_inlineStackTop->remapOperand(operand));
}
enum SetMode { NormalSet, SetOnEntry };
void setDirect(int operand, NodeIndex value, SetMode setMode = NormalSet)
{
// Is this an argument?
if (operandIsArgument(operand)) {
setArgument(operand, value, setMode);
return;
}
// Must be a local.
setLocal((unsigned)operand, value, setMode);
}
void set(int operand, NodeIndex value, SetMode setMode = NormalSet)
{
setDirect(m_inlineStackTop->remapOperand(operand), value, setMode);
}
void setPair(int operand1, NodeIndex value1, int operand2, NodeIndex value2)
{
// First emit dead SetLocals for the benefit of OSR.
set(operand1, value1);
set(operand2, value2);
// Now emit the real SetLocals.
set(operand1, value1);
set(operand2, value2);
}
NodeIndex injectLazyOperandSpeculation(NodeIndex nodeIndex)
{
Node& node = m_graph[nodeIndex];
ASSERT(node.op() == GetLocal);
ASSERT(node.codeOrigin.bytecodeIndex == m_currentIndex);
SpeculatedType prediction =
m_inlineStackTop->m_lazyOperands.prediction(
LazyOperandValueProfileKey(m_currentIndex, node.local()));
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("Lazy operand [@", nodeIndex, ", bc#", m_currentIndex, ", r", node.local(), "] prediction: ", SpeculationDump(prediction), "\n");
#endif
node.variableAccessData()->predict(prediction);
return nodeIndex;
}
// Used in implementing get/set, above, where the operand is a local variable.
NodeIndex getLocal(unsigned operand)
{
NodeIndex nodeIndex = m_currentBlock->variablesAtTail.local(operand);
bool isCaptured = m_codeBlock->isCaptured(operand, m_inlineStackTop->m_inlineCallFrame);
if (nodeIndex != NoNode) {
Node* nodePtr = &m_graph[nodeIndex];
if (nodePtr->op() == Flush) {
// Two possibilities: either the block wants the local to be live
// but has not loaded its value, or it has loaded its value, in
// which case we're done.
nodeIndex = nodePtr->child1().index();
Node& flushChild = m_graph[nodeIndex];
if (flushChild.op() == Phi) {
VariableAccessData* variableAccessData = flushChild.variableAccessData();
variableAccessData->mergeIsCaptured(isCaptured);
nodeIndex = injectLazyOperandSpeculation(addToGraph(GetLocal, OpInfo(variableAccessData), nodeIndex));
m_currentBlock->variablesAtTail.local(operand) = nodeIndex;
return nodeIndex;
}
nodePtr = &flushChild;
}
ASSERT(&m_graph[nodeIndex] == nodePtr);
ASSERT(nodePtr->op() != Flush);
nodePtr->variableAccessData()->mergeIsCaptured(isCaptured);
if (isCaptured) {
// We wish to use the same variable access data as the previous access,
// but for all other purposes we want to issue a load since for all we
// know, at this stage of compilation, the local has been clobbered.
// Make sure we link to the Phi node, not to the GetLocal.
if (nodePtr->op() == GetLocal)
nodeIndex = nodePtr->child1().index();
NodeIndex newGetLocal = injectLazyOperandSpeculation(
addToGraph(GetLocal, OpInfo(nodePtr->variableAccessData()), nodeIndex));
m_currentBlock->variablesAtTail.local(operand) = newGetLocal;
return newGetLocal;
}
if (nodePtr->op() == GetLocal)
return nodeIndex;
ASSERT(nodePtr->op() == SetLocal);
return nodePtr->child1().index();
}
// Check for reads of temporaries from prior blocks,
// expand m_preservedVars to cover these.
m_preservedVars.set(operand);
VariableAccessData* variableAccessData = newVariableAccessData(operand, isCaptured);
NodeIndex phi = addToGraph(Phi, OpInfo(variableAccessData));
m_localPhiStack.append(PhiStackEntry(m_currentBlock, phi, operand));
nodeIndex = injectLazyOperandSpeculation(addToGraph(GetLocal, OpInfo(variableAccessData), phi));
m_currentBlock->variablesAtTail.local(operand) = nodeIndex;
m_currentBlock->variablesAtHead.setLocalFirstTime(operand, nodeIndex);
return nodeIndex;
}
void setLocal(unsigned operand, NodeIndex value, SetMode setMode = NormalSet)
{
bool isCaptured = m_codeBlock->isCaptured(operand, m_inlineStackTop->m_inlineCallFrame);
if (setMode == NormalSet) {
ArgumentPosition* argumentPosition = findArgumentPositionForLocal(operand);
if (isCaptured || argumentPosition)
flushDirect(operand, argumentPosition);
}
VariableAccessData* variableAccessData = newVariableAccessData(operand, isCaptured);
variableAccessData->mergeStructureCheckHoistingFailed(
m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, BadCache));
NodeIndex nodeIndex = addToGraph(SetLocal, OpInfo(variableAccessData), value);
m_currentBlock->variablesAtTail.local(operand) = nodeIndex;
}
// Used in implementing get/set, above, where the operand is an argument.
NodeIndex getArgument(unsigned operand)
{
unsigned argument = operandToArgument(operand);
ASSERT(argument < m_numArguments);
NodeIndex nodeIndex = m_currentBlock->variablesAtTail.argument(argument);
bool isCaptured = m_codeBlock->isCaptured(operand);
if (nodeIndex != NoNode) {
Node* nodePtr = &m_graph[nodeIndex];
if (nodePtr->op() == Flush) {
// Two possibilities: either the block wants the local to be live
// but has not loaded its value, or it has loaded its value, in
// which case we're done.
nodeIndex = nodePtr->child1().index();
Node& flushChild = m_graph[nodeIndex];
if (flushChild.op() == Phi) {
VariableAccessData* variableAccessData = flushChild.variableAccessData();
variableAccessData->mergeIsCaptured(isCaptured);
nodeIndex = injectLazyOperandSpeculation(addToGraph(GetLocal, OpInfo(variableAccessData), nodeIndex));
m_currentBlock->variablesAtTail.argument(argument) = nodeIndex;
return nodeIndex;
}
nodePtr = &flushChild;
}
ASSERT(&m_graph[nodeIndex] == nodePtr);
ASSERT(nodePtr->op() != Flush);
nodePtr->variableAccessData()->mergeIsCaptured(isCaptured);
if (nodePtr->op() == SetArgument) {
// We're getting an argument in the first basic block; link
// the GetLocal to the SetArgument.
ASSERT(nodePtr->local() == static_cast<VirtualRegister>(operand));
VariableAccessData* variable = nodePtr->variableAccessData();
nodeIndex = injectLazyOperandSpeculation(addToGraph(GetLocal, OpInfo(variable), nodeIndex));
m_currentBlock->variablesAtTail.argument(argument) = nodeIndex;
return nodeIndex;
}
if (isCaptured) {
if (nodePtr->op() == GetLocal)
nodeIndex = nodePtr->child1().index();
return injectLazyOperandSpeculation(addToGraph(GetLocal, OpInfo(nodePtr->variableAccessData()), nodeIndex));
}
if (nodePtr->op() == GetLocal)
return nodeIndex;
ASSERT(nodePtr->op() == SetLocal);
return nodePtr->child1().index();
}
VariableAccessData* variableAccessData = newVariableAccessData(operand, isCaptured);
NodeIndex phi = addToGraph(Phi, OpInfo(variableAccessData));
m_argumentPhiStack.append(PhiStackEntry(m_currentBlock, phi, argument));
nodeIndex = injectLazyOperandSpeculation(addToGraph(GetLocal, OpInfo(variableAccessData), phi));
m_currentBlock->variablesAtTail.argument(argument) = nodeIndex;
m_currentBlock->variablesAtHead.setArgumentFirstTime(argument, nodeIndex);
return nodeIndex;
}
void setArgument(int operand, NodeIndex value, SetMode setMode = NormalSet)
{
unsigned argument = operandToArgument(operand);
ASSERT(argument < m_numArguments);
bool isCaptured = m_codeBlock->isCaptured(operand);
// Always flush arguments, except for 'this'.
if (argument && setMode == NormalSet)
flushDirect(operand);
VariableAccessData* variableAccessData = newVariableAccessData(operand, isCaptured);
variableAccessData->mergeStructureCheckHoistingFailed(
m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, BadCache));
NodeIndex nodeIndex = addToGraph(SetLocal, OpInfo(variableAccessData), value);
m_currentBlock->variablesAtTail.argument(argument) = nodeIndex;
}
ArgumentPosition* findArgumentPositionForArgument(int argument)
{
InlineStackEntry* stack = m_inlineStackTop;
while (stack->m_inlineCallFrame)
stack = stack->m_caller;
return stack->m_argumentPositions[argument];
}
ArgumentPosition* findArgumentPositionForLocal(int operand)
{
for (InlineStackEntry* stack = m_inlineStackTop; ; stack = stack->m_caller) {
InlineCallFrame* inlineCallFrame = stack->m_inlineCallFrame;
if (!inlineCallFrame)
break;
if (operand >= static_cast<int>(inlineCallFrame->stackOffset - JSStack::CallFrameHeaderSize))
continue;
if (operand == inlineCallFrame->stackOffset + CallFrame::thisArgumentOffset())
continue;
if (operand < static_cast<int>(inlineCallFrame->stackOffset - JSStack::CallFrameHeaderSize - inlineCallFrame->arguments.size()))
continue;
int argument = operandToArgument(operand - inlineCallFrame->stackOffset);
return stack->m_argumentPositions[argument];
}
return 0;
}
ArgumentPosition* findArgumentPosition(int operand)
{
if (operandIsArgument(operand))
return findArgumentPositionForArgument(operandToArgument(operand));
return findArgumentPositionForLocal(operand);
}
void flush(int operand)
{
flushDirect(m_inlineStackTop->remapOperand(operand));
}
void flushDirect(int operand)
{
flushDirect(operand, findArgumentPosition(operand));
}
void flushDirect(int operand, ArgumentPosition* argumentPosition)
{
// FIXME: This should check if the same operand had already been flushed to
// some other local variable.
bool isCaptured = m_codeBlock->isCaptured(operand, m_inlineStackTop->m_inlineCallFrame);
ASSERT(operand < FirstConstantRegisterIndex);
NodeIndex nodeIndex;
int index;
if (operandIsArgument(operand)) {
index = operandToArgument(operand);
nodeIndex = m_currentBlock->variablesAtTail.argument(index);
} else {
index = operand;
nodeIndex = m_currentBlock->variablesAtTail.local(index);
m_preservedVars.set(operand);
}
if (nodeIndex != NoNode) {
Node& node = m_graph[nodeIndex];
switch (node.op()) {
case Flush:
nodeIndex = node.child1().index();
break;
case GetLocal:
nodeIndex = node.child1().index();
break;
default:
break;
}
ASSERT(m_graph[nodeIndex].op() != Flush
&& m_graph[nodeIndex].op() != GetLocal);
// Emit a Flush regardless of whether we already flushed it.
// This gives us guidance to see that the variable also needs to be flushed
// for arguments, even if it already had to be flushed for other reasons.
VariableAccessData* variableAccessData = node.variableAccessData();
variableAccessData->mergeIsCaptured(isCaptured);
addToGraph(Flush, OpInfo(variableAccessData), nodeIndex);
if (argumentPosition)
argumentPosition->addVariable(variableAccessData);
return;
}
VariableAccessData* variableAccessData = newVariableAccessData(operand, isCaptured);
NodeIndex phi = addToGraph(Phi, OpInfo(variableAccessData));
nodeIndex = addToGraph(Flush, OpInfo(variableAccessData), phi);
if (operandIsArgument(operand)) {
m_argumentPhiStack.append(PhiStackEntry(m_currentBlock, phi, index));
m_currentBlock->variablesAtTail.argument(index) = nodeIndex;
m_currentBlock->variablesAtHead.setArgumentFirstTime(index, nodeIndex);
} else {
m_localPhiStack.append(PhiStackEntry(m_currentBlock, phi, index));
m_currentBlock->variablesAtTail.local(index) = nodeIndex;
m_currentBlock->variablesAtHead.setLocalFirstTime(index, nodeIndex);
}
if (argumentPosition)
argumentPosition->addVariable(variableAccessData);
}
void flushArgumentsAndCapturedVariables()
{
int numArguments;
if (m_inlineStackTop->m_inlineCallFrame)
numArguments = m_inlineStackTop->m_inlineCallFrame->arguments.size();
else
numArguments = m_inlineStackTop->m_codeBlock->numParameters();
for (unsigned argument = numArguments; argument-- > 1;)
flush(argumentToOperand(argument));
for (int local = 0; local < m_inlineStackTop->m_codeBlock->m_numVars; ++local) {
if (!m_inlineStackTop->m_codeBlock->isCaptured(local))
continue;
flush(local);
}
}
// Get an operand, and perform a ToInt32/ToNumber conversion on it.
NodeIndex getToInt32(int operand)
{
return toInt32(get(operand));
}
// Perform an ES5 ToInt32 operation - returns a node of type NodeResultInt32.
NodeIndex toInt32(NodeIndex index)
{
Node& node = m_graph[index];
if (node.hasInt32Result())
return index;
if (node.op() == UInt32ToNumber)
return node.child1().index();
// Check for numeric constants boxed as JSValues.
if (node.op() == JSConstant) {
JSValue v = valueOfJSConstant(index);
if (v.isInt32())
return getJSConstant(node.constantNumber());
if (v.isNumber())
return getJSConstantForValue(JSValue(JSC::toInt32(v.asNumber())));
}
return addToGraph(ValueToInt32, index);
}
NodeIndex getJSConstantForValue(JSValue constantValue)
{
unsigned constantIndex = m_codeBlock->addOrFindConstant(constantValue);
if (constantIndex >= m_constants.size())
m_constants.append(ConstantRecord());
ASSERT(m_constants.size() == m_codeBlock->numberOfConstantRegisters());
return getJSConstant(constantIndex);
}
NodeIndex getJSConstant(unsigned constant)
{
NodeIndex index = m_constants[constant].asJSValue;
if (index != NoNode)
return index;
NodeIndex resultIndex = addToGraph(JSConstant, OpInfo(constant));
m_constants[constant].asJSValue = resultIndex;
return resultIndex;
}
NodeIndex getCallee()
{
return addToGraph(GetCallee);
}
// Helper functions to get/set the this value.
NodeIndex getThis()
{
return get(m_inlineStackTop->m_codeBlock->thisRegister());
}
void setThis(NodeIndex value)
{
set(m_inlineStackTop->m_codeBlock->thisRegister(), value);
}
// Convenience methods for checking nodes for constants.
bool isJSConstant(NodeIndex index)
{
return m_graph[index].op() == JSConstant;
}
bool isInt32Constant(NodeIndex nodeIndex)
{
return isJSConstant(nodeIndex) && valueOfJSConstant(nodeIndex).isInt32();
}
// Convenience methods for getting constant values.
JSValue valueOfJSConstant(NodeIndex index)
{
ASSERT(isJSConstant(index));
return m_codeBlock->getConstant(FirstConstantRegisterIndex + m_graph[index].constantNumber());
}
int32_t valueOfInt32Constant(NodeIndex nodeIndex)
{
ASSERT(isInt32Constant(nodeIndex));
return valueOfJSConstant(nodeIndex).asInt32();
}
// This method returns a JSConstant with the value 'undefined'.
NodeIndex constantUndefined()
{
// Has m_constantUndefined been set up yet?
if (m_constantUndefined == UINT_MAX) {
// Search the constant pool for undefined, if we find it, we can just reuse this!
unsigned numberOfConstants = m_codeBlock->numberOfConstantRegisters();
for (m_constantUndefined = 0; m_constantUndefined < numberOfConstants; ++m_constantUndefined) {
JSValue testMe = m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constantUndefined);
if (testMe.isUndefined())
return getJSConstant(m_constantUndefined);
}
// Add undefined to the CodeBlock's constants, and add a corresponding slot in m_constants.
ASSERT(m_constants.size() == numberOfConstants);
m_codeBlock->addConstant(jsUndefined());
m_constants.append(ConstantRecord());
ASSERT(m_constants.size() == m_codeBlock->numberOfConstantRegisters());
}
// m_constantUndefined must refer to an entry in the CodeBlock's constant pool that has the value 'undefined'.
ASSERT(m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constantUndefined).isUndefined());
return getJSConstant(m_constantUndefined);
}
// This method returns a JSConstant with the value 'null'.
NodeIndex constantNull()
{
// Has m_constantNull been set up yet?
if (m_constantNull == UINT_MAX) {
// Search the constant pool for null, if we find it, we can just reuse this!
unsigned numberOfConstants = m_codeBlock->numberOfConstantRegisters();
for (m_constantNull = 0; m_constantNull < numberOfConstants; ++m_constantNull) {
JSValue testMe = m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constantNull);
if (testMe.isNull())
return getJSConstant(m_constantNull);
}
// Add null to the CodeBlock's constants, and add a corresponding slot in m_constants.
ASSERT(m_constants.size() == numberOfConstants);
m_codeBlock->addConstant(jsNull());
m_constants.append(ConstantRecord());
ASSERT(m_constants.size() == m_codeBlock->numberOfConstantRegisters());
}
// m_constantNull must refer to an entry in the CodeBlock's constant pool that has the value 'null'.
ASSERT(m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constantNull).isNull());
return getJSConstant(m_constantNull);
}
// This method returns a DoubleConstant with the value 1.
NodeIndex one()
{
// Has m_constant1 been set up yet?
if (m_constant1 == UINT_MAX) {
// Search the constant pool for the value 1, if we find it, we can just reuse this!
unsigned numberOfConstants = m_codeBlock->numberOfConstantRegisters();
for (m_constant1 = 0; m_constant1 < numberOfConstants; ++m_constant1) {
JSValue testMe = m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constant1);
if (testMe.isInt32() && testMe.asInt32() == 1)
return getJSConstant(m_constant1);
}
// Add the value 1 to the CodeBlock's constants, and add a corresponding slot in m_constants.
ASSERT(m_constants.size() == numberOfConstants);
m_codeBlock->addConstant(jsNumber(1));
m_constants.append(ConstantRecord());
ASSERT(m_constants.size() == m_codeBlock->numberOfConstantRegisters());
}
// m_constant1 must refer to an entry in the CodeBlock's constant pool that has the integer value 1.
ASSERT(m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constant1).isInt32());
ASSERT(m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constant1).asInt32() == 1);
return getJSConstant(m_constant1);
}
// This method returns a DoubleConstant with the value NaN.
NodeIndex constantNaN()
{
JSValue nan = jsNaN();
// Has m_constantNaN been set up yet?
if (m_constantNaN == UINT_MAX) {
// Search the constant pool for the value NaN, if we find it, we can just reuse this!
unsigned numberOfConstants = m_codeBlock->numberOfConstantRegisters();
for (m_constantNaN = 0; m_constantNaN < numberOfConstants; ++m_constantNaN) {
JSValue testMe = m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constantNaN);
if (JSValue::encode(testMe) == JSValue::encode(nan))
return getJSConstant(m_constantNaN);
}
// Add the value nan to the CodeBlock's constants, and add a corresponding slot in m_constants.
ASSERT(m_constants.size() == numberOfConstants);
m_codeBlock->addConstant(nan);
m_constants.append(ConstantRecord());
ASSERT(m_constants.size() == m_codeBlock->numberOfConstantRegisters());
}
// m_constantNaN must refer to an entry in the CodeBlock's constant pool that has the value nan.
ASSERT(m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constantNaN).isDouble());
ASSERT(isnan(m_codeBlock->getConstant(FirstConstantRegisterIndex + m_constantNaN).asDouble()));
return getJSConstant(m_constantNaN);
}
NodeIndex cellConstant(JSCell* cell)
{
HashMap<JSCell*, NodeIndex>::AddResult result = m_cellConstantNodes.add(cell, NoNode);
if (result.isNewEntry)
result.iterator->value = addToGraph(WeakJSConstant, OpInfo(cell));
return result.iterator->value;
}
CodeOrigin currentCodeOrigin()
{
return CodeOrigin(m_currentIndex, m_inlineStackTop->m_inlineCallFrame, m_currentProfilingIndex - m_currentIndex);
}
// These methods create a node and add it to the graph. If nodes of this type are
// 'mustGenerate' then the node will implicitly be ref'ed to ensure generation.
NodeIndex addToGraph(NodeType op, NodeIndex child1 = NoNode, NodeIndex child2 = NoNode, NodeIndex child3 = NoNode)
{
NodeIndex resultIndex = (NodeIndex)m_graph.size();
m_graph.append(Node(op, currentCodeOrigin(), child1, child2, child3));
ASSERT(op != Phi);
m_currentBlock->append(resultIndex);
if (defaultFlags(op) & NodeMustGenerate)
m_graph.ref(resultIndex);
return resultIndex;
}
NodeIndex addToGraph(NodeType op, OpInfo info, NodeIndex child1 = NoNode, NodeIndex child2 = NoNode, NodeIndex child3 = NoNode)
{
NodeIndex resultIndex = (NodeIndex)m_graph.size();
m_graph.append(Node(op, currentCodeOrigin(), info, child1, child2, child3));
if (op == Phi)
m_currentBlock->phis.append(resultIndex);
else
m_currentBlock->append(resultIndex);
if (defaultFlags(op) & NodeMustGenerate)
m_graph.ref(resultIndex);
return resultIndex;
}
NodeIndex addToGraph(NodeType op, OpInfo info1, OpInfo info2, NodeIndex child1 = NoNode, NodeIndex child2 = NoNode, NodeIndex child3 = NoNode)
{
NodeIndex resultIndex = (NodeIndex)m_graph.size();
m_graph.append(Node(op, currentCodeOrigin(), info1, info2, child1, child2, child3));
ASSERT(op != Phi);
m_currentBlock->append(resultIndex);
if (defaultFlags(op) & NodeMustGenerate)
m_graph.ref(resultIndex);
return resultIndex;
}
NodeIndex addToGraph(Node::VarArgTag, NodeType op, OpInfo info1, OpInfo info2)
{
NodeIndex resultIndex = (NodeIndex)m_graph.size();
m_graph.append(Node(Node::VarArg, op, currentCodeOrigin(), info1, info2, m_graph.m_varArgChildren.size() - m_numPassedVarArgs, m_numPassedVarArgs));
ASSERT(op != Phi);
m_currentBlock->append(resultIndex);
m_numPassedVarArgs = 0;
if (defaultFlags(op) & NodeMustGenerate)
m_graph.ref(resultIndex);
return resultIndex;
}
NodeIndex insertPhiNode(OpInfo info, BasicBlock* block)
{
NodeIndex resultIndex = (NodeIndex)m_graph.size();
m_graph.append(Node(Phi, currentCodeOrigin(), info));
block->phis.append(resultIndex);
return resultIndex;
}
void addVarArgChild(NodeIndex child)
{
m_graph.m_varArgChildren.append(Edge(child));
m_numPassedVarArgs++;
}
NodeIndex addCall(Interpreter* interpreter, Instruction* currentInstruction, NodeType op)
{
Instruction* putInstruction = currentInstruction + OPCODE_LENGTH(op_call);
SpeculatedType prediction = SpecNone;
if (interpreter->getOpcodeID(putInstruction->u.opcode) == op_call_put_result) {
m_currentProfilingIndex = m_currentIndex + OPCODE_LENGTH(op_call);
prediction = getPrediction();
}
addVarArgChild(get(currentInstruction[1].u.operand));
int argCount = currentInstruction[2].u.operand;
if (JSStack::CallFrameHeaderSize + (unsigned)argCount > m_parameterSlots)
m_parameterSlots = JSStack::CallFrameHeaderSize + argCount;
int registerOffset = currentInstruction[3].u.operand;
int dummyThisArgument = op == Call ? 0 : 1;
for (int i = 0 + dummyThisArgument; i < argCount; ++i)
addVarArgChild(get(registerOffset + argumentToOperand(i)));
NodeIndex call = addToGraph(Node::VarArg, op, OpInfo(0), OpInfo(prediction));
if (interpreter->getOpcodeID(putInstruction->u.opcode) == op_call_put_result)
set(putInstruction[1].u.operand, call);
return call;
}
NodeIndex addStructureTransitionCheck(JSCell* object, Structure* structure)
{
// Add a weak JS constant for the object regardless, since the code should
// be jettisoned if the object ever dies.
NodeIndex objectIndex = cellConstant(object);
if (object->structure() == structure && structure->transitionWatchpointSetIsStillValid()) {
addToGraph(StructureTransitionWatchpoint, OpInfo(structure), objectIndex);
return objectIndex;
}
addToGraph(CheckStructure, OpInfo(m_graph.addStructureSet(structure)), objectIndex);
return objectIndex;
}
NodeIndex addStructureTransitionCheck(JSCell* object)
{
return addStructureTransitionCheck(object, object->structure());
}
SpeculatedType getPredictionWithoutOSRExit(NodeIndex nodeIndex, unsigned bytecodeIndex)
{
UNUSED_PARAM(nodeIndex);
SpeculatedType prediction = m_inlineStackTop->m_profiledBlock->valueProfilePredictionForBytecodeOffset(bytecodeIndex);
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("Dynamic [@", nodeIndex, ", bc#", bytecodeIndex, "] prediction: ", SpeculationDump(prediction), "\n");
#endif
return prediction;
}
SpeculatedType getPrediction(NodeIndex nodeIndex, unsigned bytecodeIndex)
{
SpeculatedType prediction = getPredictionWithoutOSRExit(nodeIndex, bytecodeIndex);
if (prediction == SpecNone) {
// We have no information about what values this node generates. Give up
// on executing this code, since we're likely to do more damage than good.
addToGraph(ForceOSRExit);
}
return prediction;
}
SpeculatedType getPredictionWithoutOSRExit()
{
return getPredictionWithoutOSRExit(m_graph.size(), m_currentProfilingIndex);
}
SpeculatedType getPrediction()
{
return getPrediction(m_graph.size(), m_currentProfilingIndex);
}
ArrayMode getArrayMode(ArrayProfile* profile, Array::Action action)
{
profile->computeUpdatedPrediction(m_inlineStackTop->m_codeBlock);
return ArrayMode::fromObserved(profile, action, false);
}
ArrayMode getArrayMode(ArrayProfile* profile)
{
return getArrayMode(profile, Array::Read);
}
ArrayMode getArrayModeAndEmitChecks(ArrayProfile* profile, Array::Action action, NodeIndex base)
{
profile->computeUpdatedPrediction(m_inlineStackTop->m_codeBlock);
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
if (m_inlineStackTop->m_profiledBlock->numberOfRareCaseProfiles())
dataLogF("Slow case profile for bc#%u: %u\n", m_currentIndex, m_inlineStackTop->m_profiledBlock->rareCaseProfileForBytecodeOffset(m_currentIndex)->m_counter);
dataLogF("Array profile for bc#%u: %p%s%s, %u\n", m_currentIndex, profile->expectedStructure(), profile->structureIsPolymorphic() ? " (polymorphic)" : "", profile->mayInterceptIndexedAccesses() ? " (may intercept)" : "", profile->observedArrayModes());
#endif
bool makeSafe =
m_inlineStackTop->m_profiledBlock->likelyToTakeSlowCase(m_currentIndex)
|| profile->outOfBounds();
ArrayMode result = ArrayMode::fromObserved(profile, action, makeSafe);
if (profile->hasDefiniteStructure() && result.benefitsFromStructureCheck())
addToGraph(CheckStructure, OpInfo(m_graph.addStructureSet(profile->expectedStructure())), base);
return result;
}
NodeIndex makeSafe(NodeIndex nodeIndex)
{
Node& node = m_graph[nodeIndex];
bool likelyToTakeSlowCase;
if (!isX86() && node.op() == ArithMod)
likelyToTakeSlowCase = false;
else
likelyToTakeSlowCase = m_inlineStackTop->m_profiledBlock->likelyToTakeSlowCase(m_currentIndex);
if (!likelyToTakeSlowCase
&& !m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, Overflow)
&& !m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, NegativeZero))
return nodeIndex;
switch (m_graph[nodeIndex].op()) {
case UInt32ToNumber:
case ArithAdd:
case ArithSub:
case ArithNegate:
case ValueAdd:
case ArithMod: // for ArithMod "MayOverflow" means we tried to divide by zero, or we saw double.
m_graph[nodeIndex].mergeFlags(NodeMayOverflow);
break;
case ArithMul:
if (m_inlineStackTop->m_profiledBlock->likelyToTakeDeepestSlowCase(m_currentIndex)
|| m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, Overflow)) {
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Making ArithMul @%u take deepest slow case.\n", nodeIndex);
#endif
m_graph[nodeIndex].mergeFlags(NodeMayOverflow | NodeMayNegZero);
} else if (m_inlineStackTop->m_profiledBlock->likelyToTakeSlowCase(m_currentIndex)
|| m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, NegativeZero)) {
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Making ArithMul @%u take faster slow case.\n", nodeIndex);
#endif
m_graph[nodeIndex].mergeFlags(NodeMayNegZero);
}
break;
default:
ASSERT_NOT_REACHED();
break;
}
return nodeIndex;
}
NodeIndex makeDivSafe(NodeIndex nodeIndex)
{
ASSERT(m_graph[nodeIndex].op() == ArithDiv);
// The main slow case counter for op_div in the old JIT counts only when
// the operands are not numbers. We don't care about that since we already
// have speculations in place that take care of that separately. We only
// care about when the outcome of the division is not an integer, which
// is what the special fast case counter tells us.
if (!m_inlineStackTop->m_profiledBlock->couldTakeSpecialFastCase(m_currentIndex)
&& !m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, Overflow)
&& !m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, NegativeZero))
return nodeIndex;
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Making %s @%u safe at bc#%u because special fast-case counter is at %u and exit profiles say %d, %d\n", Graph::opName(m_graph[nodeIndex].op()), nodeIndex, m_currentIndex, m_inlineStackTop->m_profiledBlock->specialFastCaseProfileForBytecodeOffset(m_currentIndex)->m_counter, m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, Overflow), m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, NegativeZero));
#endif
// FIXME: It might be possible to make this more granular. The DFG certainly can
// distinguish between negative zero and overflow in its exit profiles.
m_graph[nodeIndex].mergeFlags(NodeMayOverflow | NodeMayNegZero);
return nodeIndex;
}
bool willNeedFlush(StructureStubInfo& stubInfo)
{
PolymorphicAccessStructureList* list;
int listSize;
switch (stubInfo.accessType) {
case access_get_by_id_self_list:
list = stubInfo.u.getByIdSelfList.structureList;
listSize = stubInfo.u.getByIdSelfList.listSize;
break;
case access_get_by_id_proto_list:
list = stubInfo.u.getByIdProtoList.structureList;
listSize = stubInfo.u.getByIdProtoList.listSize;
break;
default:
return false;
}
for (int i = 0; i < listSize; ++i) {
if (!list->list[i].isDirect)
return true;
}
return false;
}
bool structureChainIsStillValid(bool direct, Structure* previousStructure, StructureChain* chain)
{
if (direct)
return true;
if (!previousStructure->storedPrototype().isNull() && previousStructure->storedPrototype().asCell()->structure() != chain->head()->get())
return false;
for (WriteBarrier<Structure>* it = chain->head(); *it; ++it) {
if (!(*it)->storedPrototype().isNull() && (*it)->storedPrototype().asCell()->structure() != it[1].get())
return false;
}
return true;
}
void buildOperandMapsIfNecessary();
ExecState* m_exec;
JSGlobalData* m_globalData;
CodeBlock* m_codeBlock;
CodeBlock* m_profiledBlock;
Graph& m_graph;
// The current block being generated.
BasicBlock* m_currentBlock;
// The bytecode index of the current instruction being generated.
unsigned m_currentIndex;
// The bytecode index of the value profile of the current instruction being generated.
unsigned m_currentProfilingIndex;
// We use these values during code generation, and to avoid the need for
// special handling we make sure they are available as constants in the
// CodeBlock's constant pool. These variables are initialized to
// UINT_MAX, and lazily updated to hold an index into the CodeBlock's
// constant pool, as necessary.
unsigned m_constantUndefined;
unsigned m_constantNull;
unsigned m_constantNaN;
unsigned m_constant1;
HashMap<JSCell*, unsigned> m_cellConstants;
HashMap<JSCell*, NodeIndex> m_cellConstantNodes;
// A constant in the constant pool may be represented by more than one
// node in the graph, depending on the context in which it is being used.
struct ConstantRecord {
ConstantRecord()
: asInt32(NoNode)
, asNumeric(NoNode)
, asJSValue(NoNode)
{
}
NodeIndex asInt32;
NodeIndex asNumeric;
NodeIndex asJSValue;
};
// Track the index of the node whose result is the current value for every
// register value in the bytecode - argument, local, and temporary.
Vector<ConstantRecord, 16> m_constants;
// The number of arguments passed to the function.
unsigned m_numArguments;
// The number of locals (vars + temporaries) used in the function.
unsigned m_numLocals;
// The set of registers we need to preserve across BasicBlock boundaries;
// typically equal to the set of vars, but we expand this to cover all
// temporaries that persist across blocks (dues to ?:, &&, ||, etc).
BitVector m_preservedVars;
// The number of slots (in units of sizeof(Register)) that we need to
// preallocate for calls emanating from this frame. This includes the
// size of the CallFrame, only if this is not a leaf function. (I.e.
// this is 0 if and only if this function is a leaf.)
unsigned m_parameterSlots;
// The number of var args passed to the next var arg node.
unsigned m_numPassedVarArgs;
// The index in the global resolve info.
unsigned m_globalResolveNumber;
struct PhiStackEntry {
PhiStackEntry(BasicBlock* block, NodeIndex phi, unsigned varNo)
: m_block(block)
, m_phi(phi)
, m_varNo(varNo)
{
}
BasicBlock* m_block;
NodeIndex m_phi;
unsigned m_varNo;
};
Vector<PhiStackEntry, 16> m_argumentPhiStack;
Vector<PhiStackEntry, 16> m_localPhiStack;
HashMap<ConstantBufferKey, unsigned> m_constantBufferCache;
struct InlineStackEntry {
ByteCodeParser* m_byteCodeParser;
CodeBlock* m_codeBlock;
CodeBlock* m_profiledBlock;
InlineCallFrame* m_inlineCallFrame;
VirtualRegister m_calleeVR; // absolute virtual register, not relative to call frame
ScriptExecutable* executable() { return m_codeBlock->ownerExecutable(); }
QueryableExitProfile m_exitProfile;
// Remapping of identifier and constant numbers from the code block being
// inlined (inline callee) to the code block that we're inlining into
// (the machine code block, which is the transitive, though not necessarily
// direct, caller).
Vector<unsigned> m_identifierRemap;
Vector<unsigned> m_constantRemap;
Vector<unsigned> m_constantBufferRemap;
Vector<unsigned> m_resolveOperationRemap;
Vector<unsigned> m_putToBaseOperationRemap;
// Blocks introduced by this code block, which need successor linking.
// May include up to one basic block that includes the continuation after
// the callsite in the caller. These must be appended in the order that they
// are created, but their bytecodeBegin values need not be in order as they
// are ignored.
Vector<UnlinkedBlock> m_unlinkedBlocks;
// Potential block linking targets. Must be sorted by bytecodeBegin, and
// cannot have two blocks that have the same bytecodeBegin. For this very
// reason, this is not equivalent to
Vector<BlockIndex> m_blockLinkingTargets;
// If the callsite's basic block was split into two, then this will be
// the head of the callsite block. It needs its successors linked to the
// m_unlinkedBlocks, but not the other way around: there's no way for
// any blocks in m_unlinkedBlocks to jump back into this block.
BlockIndex m_callsiteBlockHead;
// Does the callsite block head need linking? This is typically true
// but will be false for the machine code block's inline stack entry
// (since that one is not inlined) and for cases where an inline callee
// did the linking for us.
bool m_callsiteBlockHeadNeedsLinking;
VirtualRegister m_returnValue;
// Speculations about variable types collected from the profiled code block,
// which are based on OSR exit profiles that past DFG compilatins of this
// code block had gathered.
LazyOperandValueProfileParser m_lazyOperands;
// Did we see any returns? We need to handle the (uncommon but necessary)
// case where a procedure that does not return was inlined.
bool m_didReturn;
// Did we have any early returns?
bool m_didEarlyReturn;
// Pointers to the argument position trackers for this slice of code.
Vector<ArgumentPosition*> m_argumentPositions;
InlineStackEntry* m_caller;
InlineStackEntry(
ByteCodeParser*,
CodeBlock*,
CodeBlock* profiledBlock,
BlockIndex callsiteBlockHead,
VirtualRegister calleeVR,
JSFunction* callee,
VirtualRegister returnValueVR,
VirtualRegister inlineCallFrameStart,
int argumentCountIncludingThis,
CodeSpecializationKind);
~InlineStackEntry()
{
m_byteCodeParser->m_inlineStackTop = m_caller;
}
int remapOperand(int operand) const
{
if (!m_inlineCallFrame)
return operand;
if (operand >= FirstConstantRegisterIndex) {
int result = m_constantRemap[operand - FirstConstantRegisterIndex];
ASSERT(result >= FirstConstantRegisterIndex);
return result;
}
if (operand == JSStack::Callee)
return m_calleeVR;
return operand + m_inlineCallFrame->stackOffset;
}
};
InlineStackEntry* m_inlineStackTop;
// Have we built operand maps? We initialize them lazily, and only when doing
// inlining.
bool m_haveBuiltOperandMaps;
// Mapping between identifier names and numbers.
IdentifierMap m_identifierMap;
// Mapping between values and constant numbers.
JSValueMap m_jsValueMap;
// Index of the empty value, or UINT_MAX if there is no mapping. This is a horrible
// work-around for the fact that JSValueMap can't handle "empty" values.
unsigned m_emptyJSValueIndex;
// Cache of code blocks that we've generated bytecode for.
ByteCodeCache<canInlineFunctionFor> m_codeBlockCache;
Instruction* m_currentInstruction;
};
#define NEXT_OPCODE(name) \
m_currentIndex += OPCODE_LENGTH(name); \
continue
#define LAST_OPCODE(name) \
m_currentIndex += OPCODE_LENGTH(name); \
return shouldContinueParsing
void ByteCodeParser::handleCall(Interpreter* interpreter, Instruction* currentInstruction, NodeType op, CodeSpecializationKind kind)
{
ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct));
NodeIndex callTarget = get(currentInstruction[1].u.operand);
enum {
ConstantFunction,
ConstantInternalFunction,
LinkedFunction,
UnknownFunction
} callType;
CallLinkStatus callLinkStatus = CallLinkStatus::computeFor(
m_inlineStackTop->m_profiledBlock, m_currentIndex);
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("For call at @%lu bc#%u: ", m_graph.size(), m_currentIndex);
if (callLinkStatus.isSet()) {
if (callLinkStatus.couldTakeSlowPath())
dataLogF("could take slow path, ");
dataLogF("target = %p\n", callLinkStatus.callTarget());
} else
dataLogF("not set.\n");
#endif
if (m_graph.isFunctionConstant(callTarget)) {
callType = ConstantFunction;
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Call at [@%lu, bc#%u] has a function constant: %p, exec %p.\n",
m_graph.size(), m_currentIndex,
m_graph.valueOfFunctionConstant(callTarget),
m_graph.valueOfFunctionConstant(callTarget)->executable());
#endif
} else if (m_graph.isInternalFunctionConstant(callTarget)) {
callType = ConstantInternalFunction;
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Call at [@%lu, bc#%u] has an internal function constant: %p.\n",
m_graph.size(), m_currentIndex,
m_graph.valueOfInternalFunctionConstant(callTarget));
#endif
} else if (callLinkStatus.isSet() && !callLinkStatus.couldTakeSlowPath()
&& !m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, BadCache)) {
callType = LinkedFunction;
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Call at [@%lu, bc#%u] is linked to: %p, exec %p.\n",
m_graph.size(), m_currentIndex, callLinkStatus.callTarget(),
callLinkStatus.callTarget()->executable());
#endif
} else {
callType = UnknownFunction;
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Call at [@%lu, bc#%u] is has an unknown or ambiguous target.\n",
m_graph.size(), m_currentIndex);
#endif
}
if (callType != UnknownFunction) {
int argumentCountIncludingThis = currentInstruction[2].u.operand;
int registerOffset = currentInstruction[3].u.operand;
// Do we have a result?
bool usesResult = false;
int resultOperand = 0; // make compiler happy
unsigned nextOffset = m_currentIndex + OPCODE_LENGTH(op_call);
Instruction* putInstruction = currentInstruction + OPCODE_LENGTH(op_call);
SpeculatedType prediction = SpecNone;
if (interpreter->getOpcodeID(putInstruction->u.opcode) == op_call_put_result) {
resultOperand = putInstruction[1].u.operand;
usesResult = true;
m_currentProfilingIndex = nextOffset;
prediction = getPrediction();
nextOffset += OPCODE_LENGTH(op_call_put_result);
}
if (callType == ConstantInternalFunction) {
if (handleConstantInternalFunction(usesResult, resultOperand, m_graph.valueOfInternalFunctionConstant(callTarget), registerOffset, argumentCountIncludingThis, prediction, kind))
return;
// Can only handle this using the generic call handler.
addCall(interpreter, currentInstruction, op);
return;
}
JSFunction* expectedFunction;
Intrinsic intrinsic;
bool certainAboutExpectedFunction;
if (callType == ConstantFunction) {
expectedFunction = m_graph.valueOfFunctionConstant(callTarget);
intrinsic = expectedFunction->executable()->intrinsicFor(kind);
certainAboutExpectedFunction = true;
} else {
ASSERT(callType == LinkedFunction);
expectedFunction = callLinkStatus.callTarget();
intrinsic = expectedFunction->executable()->intrinsicFor(kind);
certainAboutExpectedFunction = false;
}
if (intrinsic != NoIntrinsic) {
if (!certainAboutExpectedFunction)
emitFunctionCheck(expectedFunction, callTarget, registerOffset, kind);
if (handleIntrinsic(usesResult, resultOperand, intrinsic, registerOffset, argumentCountIncludingThis, prediction)) {
if (!certainAboutExpectedFunction) {
// Need to keep the call target alive for OSR. We could easily optimize this out if we wanted
// to, since at this point we know that the call target is a constant. It's just that OSR isn't
// smart enough to figure that out, since it doesn't understand CheckFunction.
addToGraph(Phantom, callTarget);
}
return;
}
} else if (handleInlining(usesResult, currentInstruction[1].u.operand, callTarget, resultOperand, certainAboutExpectedFunction, expectedFunction, registerOffset, argumentCountIncludingThis, nextOffset, kind))
return;
}
addCall(interpreter, currentInstruction, op);
}
void ByteCodeParser::emitFunctionCheck(JSFunction* expectedFunction, NodeIndex callTarget, int registerOffset, CodeSpecializationKind kind)
{
NodeIndex thisArgument;
if (kind == CodeForCall)
thisArgument = get(registerOffset + argumentToOperand(0));
else
thisArgument = NoNode;
addToGraph(CheckFunction, OpInfo(expectedFunction), callTarget, thisArgument);
}
bool ByteCodeParser::handleInlining(bool usesResult, int callTarget, NodeIndex callTargetNodeIndex, int resultOperand, bool certainAboutExpectedFunction, JSFunction* expectedFunction, int registerOffset, int argumentCountIncludingThis, unsigned nextOffset, CodeSpecializationKind kind)
{
// First, the really simple checks: do we have an actual JS function?
if (!expectedFunction)
return false;
if (expectedFunction->isHostFunction())
return false;
FunctionExecutable* executable = expectedFunction->jsExecutable();
// Does the number of arguments we're passing match the arity of the target? We currently
// inline only if the number of arguments passed is greater than or equal to the number
// arguments expected.
if (static_cast<int>(executable->parameterCount()) + 1 > argumentCountIncludingThis)
return false;
// Have we exceeded inline stack depth, or are we trying to inline a recursive call?
// If either of these are detected, then don't inline.
unsigned depth = 0;
for (InlineStackEntry* entry = m_inlineStackTop; entry; entry = entry->m_caller) {
++depth;
if (depth >= Options::maximumInliningDepth())
return false; // Depth exceeded.
if (entry->executable() == executable)
return false; // Recursion detected.
}
// Does the code block's size match the heuristics/requirements for being
// an inline candidate?
CodeBlock* profiledBlock = executable->profiledCodeBlockFor(kind);
if (!profiledBlock)
return false;
if (!mightInlineFunctionFor(profiledBlock, kind))
return false;
// If we get here then it looks like we should definitely inline this code. Proceed
// with parsing the code to get bytecode, so that we can then parse the bytecode.
// Note that if LLInt is enabled, the bytecode will always be available. Also note
// that if LLInt is enabled, we may inline a code block that has never been JITted
// before!
CodeBlock* codeBlock = m_codeBlockCache.get(CodeBlockKey(executable, kind), expectedFunction->scope());
if (!codeBlock)
return false;
ASSERT(canInlineFunctionFor(codeBlock, kind));
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Inlining executable %p.\n", executable);
#endif
// Now we know without a doubt that we are committed to inlining. So begin the process
// by checking the callee (if necessary) and making sure that arguments and the callee
// are flushed.
if (!certainAboutExpectedFunction)
emitFunctionCheck(expectedFunction, callTargetNodeIndex, registerOffset, kind);
// FIXME: Don't flush constants!
int inlineCallFrameStart = m_inlineStackTop->remapOperand(registerOffset) - JSStack::CallFrameHeaderSize;
// Make sure that the area used by the call frame is reserved.
for (int arg = inlineCallFrameStart + JSStack::CallFrameHeaderSize + codeBlock->m_numVars; arg-- > inlineCallFrameStart;)
m_preservedVars.set(arg);
// Make sure that we have enough locals.
unsigned newNumLocals = inlineCallFrameStart + JSStack::CallFrameHeaderSize + codeBlock->m_numCalleeRegisters;
if (newNumLocals > m_numLocals) {
m_numLocals = newNumLocals;
for (size_t i = 0; i < m_graph.m_blocks.size(); ++i)
m_graph.m_blocks[i]->ensureLocals(newNumLocals);
}
size_t argumentPositionStart = m_graph.m_argumentPositions.size();
InlineStackEntry inlineStackEntry(
this, codeBlock, profiledBlock, m_graph.m_blocks.size() - 1,
(VirtualRegister)m_inlineStackTop->remapOperand(callTarget), expectedFunction,
(VirtualRegister)m_inlineStackTop->remapOperand(
usesResult ? resultOperand : InvalidVirtualRegister),
(VirtualRegister)inlineCallFrameStart, argumentCountIncludingThis, kind);
// This is where the actual inlining really happens.
unsigned oldIndex = m_currentIndex;
unsigned oldProfilingIndex = m_currentProfilingIndex;
m_currentIndex = 0;
m_currentProfilingIndex = 0;
addToGraph(InlineStart, OpInfo(argumentPositionStart));
parseCodeBlock();
m_currentIndex = oldIndex;
m_currentProfilingIndex = oldProfilingIndex;
// If the inlined code created some new basic blocks, then we have linking to do.
if (inlineStackEntry.m_callsiteBlockHead != m_graph.m_blocks.size() - 1) {
ASSERT(!inlineStackEntry.m_unlinkedBlocks.isEmpty());
if (inlineStackEntry.m_callsiteBlockHeadNeedsLinking)
linkBlock(m_graph.m_blocks[inlineStackEntry.m_callsiteBlockHead].get(), inlineStackEntry.m_blockLinkingTargets);
else
ASSERT(m_graph.m_blocks[inlineStackEntry.m_callsiteBlockHead]->isLinked);
// It's possible that the callsite block head is not owned by the caller.
if (!inlineStackEntry.m_caller->m_unlinkedBlocks.isEmpty()) {
// It's definitely owned by the caller, because the caller created new blocks.
// Assert that this all adds up.
ASSERT(inlineStackEntry.m_caller->m_unlinkedBlocks.last().m_blockIndex == inlineStackEntry.m_callsiteBlockHead);
ASSERT(inlineStackEntry.m_caller->m_unlinkedBlocks.last().m_needsNormalLinking);
inlineStackEntry.m_caller->m_unlinkedBlocks.last().m_needsNormalLinking = false;
} else {
// It's definitely not owned by the caller. Tell the caller that he does not
// need to link his callsite block head, because we did it for him.
ASSERT(inlineStackEntry.m_caller->m_callsiteBlockHeadNeedsLinking);
ASSERT(inlineStackEntry.m_caller->m_callsiteBlockHead == inlineStackEntry.m_callsiteBlockHead);
inlineStackEntry.m_caller->m_callsiteBlockHeadNeedsLinking = false;
}
linkBlocks(inlineStackEntry.m_unlinkedBlocks, inlineStackEntry.m_blockLinkingTargets);
} else
ASSERT(inlineStackEntry.m_unlinkedBlocks.isEmpty());
// If there was a return, but no early returns, then we're done. We allow parsing of
// the caller to continue in whatever basic block we're in right now.
if (!inlineStackEntry.m_didEarlyReturn && inlineStackEntry.m_didReturn) {
BasicBlock* lastBlock = m_graph.m_blocks.last().get();
ASSERT(lastBlock->isEmpty() || !m_graph.last().isTerminal());
// If we created new blocks then the last block needs linking, but in the
// caller. It doesn't need to be linked to, but it needs outgoing links.
if (!inlineStackEntry.m_unlinkedBlocks.isEmpty()) {
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Reascribing bytecode index of block %p from bc#%u to bc#%u (inline return case).\n", lastBlock, lastBlock->bytecodeBegin, m_currentIndex);
#endif
// For debugging purposes, set the bytecodeBegin. Note that this doesn't matter
// for release builds because this block will never serve as a potential target
// in the linker's binary search.
lastBlock->bytecodeBegin = m_currentIndex;
m_inlineStackTop->m_caller->m_unlinkedBlocks.append(UnlinkedBlock(m_graph.m_blocks.size() - 1));
}
m_currentBlock = m_graph.m_blocks.last().get();
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Done inlining executable %p, continuing code generation at epilogue.\n", executable);
#endif
return true;
}
// If we get to this point then all blocks must end in some sort of terminals.
ASSERT(m_graph.last().isTerminal());
// Link the early returns to the basic block we're about to create.
for (size_t i = 0; i < inlineStackEntry.m_unlinkedBlocks.size(); ++i) {
if (!inlineStackEntry.m_unlinkedBlocks[i].m_needsEarlyReturnLinking)
continue;
BasicBlock* block = m_graph.m_blocks[inlineStackEntry.m_unlinkedBlocks[i].m_blockIndex].get();
ASSERT(!block->isLinked);
Node& node = m_graph[block->last()];
ASSERT(node.op() == Jump);
ASSERT(node.takenBlockIndex() == NoBlock);
node.setTakenBlockIndex(m_graph.m_blocks.size());
inlineStackEntry.m_unlinkedBlocks[i].m_needsEarlyReturnLinking = false;
#if !ASSERT_DISABLED
block->isLinked = true;
#endif
}
// Need to create a new basic block for the continuation at the caller.
OwnPtr<BasicBlock> block = adoptPtr(new BasicBlock(nextOffset, m_numArguments, m_numLocals));
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Creating inline epilogue basic block %p, #%zu for %p bc#%u at inline depth %u.\n", block.get(), m_graph.m_blocks.size(), m_inlineStackTop->executable(), m_currentIndex, CodeOrigin::inlineDepthForCallFrame(m_inlineStackTop->m_inlineCallFrame));
#endif
m_currentBlock = block.get();
ASSERT(m_inlineStackTop->m_caller->m_blockLinkingTargets.isEmpty() || m_graph.m_blocks[m_inlineStackTop->m_caller->m_blockLinkingTargets.last()]->bytecodeBegin < nextOffset);
m_inlineStackTop->m_caller->m_unlinkedBlocks.append(UnlinkedBlock(m_graph.m_blocks.size()));
m_inlineStackTop->m_caller->m_blockLinkingTargets.append(m_graph.m_blocks.size());
m_graph.m_blocks.append(block.release());
prepareToParseBlock();
// At this point we return and continue to generate code for the caller, but
// in the new basic block.
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Done inlining executable %p, continuing code generation in new block.\n", executable);
#endif
return true;
}
void ByteCodeParser::setIntrinsicResult(bool usesResult, int resultOperand, NodeIndex nodeIndex)
{
if (!usesResult)
return;
set(resultOperand, nodeIndex);
}
bool ByteCodeParser::handleMinMax(bool usesResult, int resultOperand, NodeType op, int registerOffset, int argumentCountIncludingThis)
{
if (argumentCountIncludingThis == 1) { // Math.min()
setIntrinsicResult(usesResult, resultOperand, constantNaN());
return true;
}
if (argumentCountIncludingThis == 2) { // Math.min(x)
// FIXME: what we'd really like is a ValueToNumber, except we don't support that right now. Oh well.
NodeIndex result = get(registerOffset + argumentToOperand(1));
addToGraph(CheckNumber, result);
setIntrinsicResult(usesResult, resultOperand, result);
return true;
}
if (argumentCountIncludingThis == 3) { // Math.min(x, y)
setIntrinsicResult(usesResult, resultOperand, addToGraph(op, get(registerOffset + argumentToOperand(1)), get(registerOffset + argumentToOperand(2))));
return true;
}
// Don't handle >=3 arguments for now.
return false;
}
// FIXME: We dead-code-eliminate unused Math intrinsics, but that's invalid because
// they need to perform the ToNumber conversion, which can have side-effects.
bool ByteCodeParser::handleIntrinsic(bool usesResult, int resultOperand, Intrinsic intrinsic, int registerOffset, int argumentCountIncludingThis, SpeculatedType prediction)
{
switch (intrinsic) {
case AbsIntrinsic: {
if (argumentCountIncludingThis == 1) { // Math.abs()
setIntrinsicResult(usesResult, resultOperand, constantNaN());
return true;
}
if (!MacroAssembler::supportsFloatingPointAbs())
return false;
NodeIndex nodeIndex = addToGraph(ArithAbs, get(registerOffset + argumentToOperand(1)));
if (m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, Overflow))
m_graph[nodeIndex].mergeFlags(NodeMayOverflow);
setIntrinsicResult(usesResult, resultOperand, nodeIndex);
return true;
}
case MinIntrinsic:
return handleMinMax(usesResult, resultOperand, ArithMin, registerOffset, argumentCountIncludingThis);
case MaxIntrinsic:
return handleMinMax(usesResult, resultOperand, ArithMax, registerOffset, argumentCountIncludingThis);
case SqrtIntrinsic: {
if (argumentCountIncludingThis == 1) { // Math.sqrt()
setIntrinsicResult(usesResult, resultOperand, constantNaN());
return true;
}
if (!MacroAssembler::supportsFloatingPointSqrt())
return false;
setIntrinsicResult(usesResult, resultOperand, addToGraph(ArithSqrt, get(registerOffset + argumentToOperand(1))));
return true;
}
case ArrayPushIntrinsic: {
if (argumentCountIncludingThis != 2)
return false;
ArrayMode arrayMode = getArrayMode(m_currentInstruction[5].u.arrayProfile);
if (!arrayMode.isJSArray())
return false;
switch (arrayMode.type()) {
case Array::Undecided:
case Array::Int32:
case Array::Double:
case Array::Contiguous:
case Array::ArrayStorage: {
NodeIndex arrayPush = addToGraph(ArrayPush, OpInfo(arrayMode.asWord()), OpInfo(prediction), get(registerOffset + argumentToOperand(0)), get(registerOffset + argumentToOperand(1)));
if (usesResult)
set(resultOperand, arrayPush);
return true;
}
default:
return false;
}
}
case ArrayPopIntrinsic: {
if (argumentCountIncludingThis != 1)
return false;
ArrayMode arrayMode = getArrayMode(m_currentInstruction[5].u.arrayProfile);
if (!arrayMode.isJSArray())
return false;
switch (arrayMode.type()) {
case Array::Int32:
case Array::Double:
case Array::Contiguous:
case Array::ArrayStorage: {
NodeIndex arrayPop = addToGraph(ArrayPop, OpInfo(arrayMode.asWord()), OpInfo(prediction), get(registerOffset + argumentToOperand(0)));
if (usesResult)
set(resultOperand, arrayPop);
return true;
}
default:
return false;
}
}
case CharCodeAtIntrinsic: {
if (argumentCountIncludingThis != 2)
return false;
int thisOperand = registerOffset + argumentToOperand(0);
int indexOperand = registerOffset + argumentToOperand(1);
NodeIndex charCode = addToGraph(StringCharCodeAt, OpInfo(ArrayMode(Array::String).asWord()), get(thisOperand), getToInt32(indexOperand));
if (usesResult)
set(resultOperand, charCode);
return true;
}
case CharAtIntrinsic: {
if (argumentCountIncludingThis != 2)
return false;
int thisOperand = registerOffset + argumentToOperand(0);
int indexOperand = registerOffset + argumentToOperand(1);
NodeIndex charCode = addToGraph(StringCharAt, OpInfo(ArrayMode(Array::String).asWord()), get(thisOperand), getToInt32(indexOperand));
if (usesResult)
set(resultOperand, charCode);
return true;
}
case RegExpExecIntrinsic: {
if (argumentCountIncludingThis != 2)
return false;
NodeIndex regExpExec = addToGraph(RegExpExec, OpInfo(0), OpInfo(prediction), get(registerOffset + argumentToOperand(0)), get(registerOffset + argumentToOperand(1)));
if (usesResult)
set(resultOperand, regExpExec);
return true;
}
case RegExpTestIntrinsic: {
if (argumentCountIncludingThis != 2)
return false;
NodeIndex regExpExec = addToGraph(RegExpTest, OpInfo(0), OpInfo(prediction), get(registerOffset + argumentToOperand(0)), get(registerOffset + argumentToOperand(1)));
if (usesResult)
set(resultOperand, regExpExec);
return true;
}
default:
return false;
}
}
bool ByteCodeParser::handleConstantInternalFunction(
bool usesResult, int resultOperand, InternalFunction* function, int registerOffset,
int argumentCountIncludingThis, SpeculatedType prediction, CodeSpecializationKind kind)
{
// If we ever find that we have a lot of internal functions that we specialize for,
// then we should probably have some sort of hashtable dispatch, or maybe even
// dispatch straight through the MethodTable of the InternalFunction. But for now,
// it seems that this case is hit infrequently enough, and the number of functions
// we know about is small enough, that having just a linear cascade of if statements
// is good enough.
UNUSED_PARAM(prediction); // Remove this once we do more things.
UNUSED_PARAM(kind); // Remove this once we do more things.
if (function->classInfo() == &ArrayConstructor::s_info) {
if (argumentCountIncludingThis == 2) {
setIntrinsicResult(
usesResult, resultOperand,
addToGraph(NewArrayWithSize, OpInfo(ArrayWithUndecided), get(registerOffset + argumentToOperand(1))));
return true;
}
for (int i = 1; i < argumentCountIncludingThis; ++i)
addVarArgChild(get(registerOffset + argumentToOperand(i)));
setIntrinsicResult(
usesResult, resultOperand,
addToGraph(Node::VarArg, NewArray, OpInfo(ArrayWithUndecided), OpInfo(0)));
return true;
}
return false;
}
NodeIndex ByteCodeParser::handleGetByOffset(SpeculatedType prediction, NodeIndex base, unsigned identifierNumber, PropertyOffset offset)
{
NodeIndex propertyStorage;
if (isInlineOffset(offset))
propertyStorage = base;
else
propertyStorage = addToGraph(GetButterfly, base);
// FIXME: It would be far more efficient for load elimination (and safer from
// an OSR standpoint) if GetByOffset also referenced the object we were loading
// from, and if we could load eliminate a GetByOffset even if the butterfly
// had changed. That would be a great success.
NodeIndex getByOffset = addToGraph(GetByOffset, OpInfo(m_graph.m_storageAccessData.size()), OpInfo(prediction), propertyStorage);
StorageAccessData storageAccessData;
storageAccessData.offset = indexRelativeToBase(offset);
storageAccessData.identifierNumber = identifierNumber;
m_graph.m_storageAccessData.append(storageAccessData);
return getByOffset;
}
void ByteCodeParser::handleGetByOffset(
int destinationOperand, SpeculatedType prediction, NodeIndex base, unsigned identifierNumber,
PropertyOffset offset)
{
set(destinationOperand, handleGetByOffset(prediction, base, identifierNumber, offset));
}
void ByteCodeParser::handleGetById(
int destinationOperand, SpeculatedType prediction, NodeIndex base, unsigned identifierNumber,
const GetByIdStatus& getByIdStatus)
{
if (!getByIdStatus.isSimple()
|| m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, BadCache)) {
set(destinationOperand,
addToGraph(
getByIdStatus.makesCalls() ? GetByIdFlush : GetById,
OpInfo(identifierNumber), OpInfo(prediction), base));
return;
}
ASSERT(getByIdStatus.structureSet().size());
// The implementation of GetByOffset does not know to terminate speculative
// execution if it doesn't have a prediction, so we do it manually.
if (prediction == SpecNone)
addToGraph(ForceOSRExit);
NodeIndex originalBaseForBaselineJIT = base;
addToGraph(CheckStructure, OpInfo(m_graph.addStructureSet(getByIdStatus.structureSet())), base);
if (!getByIdStatus.chain().isEmpty()) {
Structure* currentStructure = getByIdStatus.structureSet().singletonStructure();
JSObject* currentObject = 0;
for (unsigned i = 0; i < getByIdStatus.chain().size(); ++i) {
currentObject = asObject(currentStructure->prototypeForLookup(m_inlineStackTop->m_codeBlock));
currentStructure = getByIdStatus.chain()[i];
base = addStructureTransitionCheck(currentObject, currentStructure);
}
}
// Unless we want bugs like https://bugs.webkit.org/show_bug.cgi?id=88783, we need to
// ensure that the base of the original get_by_id is kept alive until we're done with
// all of the speculations. We only insert the Phantom if there had been a CheckStructure
// on something other than the base following the CheckStructure on base, or if the
// access was compiled to a WeakJSConstant specific value, in which case we might not
// have any explicit use of the base at all.
if (getByIdStatus.specificValue() || originalBaseForBaselineJIT != base)
addToGraph(Phantom, originalBaseForBaselineJIT);
if (getByIdStatus.specificValue()) {
ASSERT(getByIdStatus.specificValue().isCell());
set(destinationOperand, cellConstant(getByIdStatus.specificValue().asCell()));
return;
}
handleGetByOffset(
destinationOperand, prediction, base, identifierNumber, getByIdStatus.offset());
}
void ByteCodeParser::prepareToParseBlock()
{
for (unsigned i = 0; i < m_constants.size(); ++i)
m_constants[i] = ConstantRecord();
m_cellConstantNodes.clear();
}
NodeIndex ByteCodeParser::getScope(bool skipTop, unsigned skipCount)
{
NodeIndex localBase;
if (m_inlineStackTop->m_inlineCallFrame) {
ASSERT(m_inlineStackTop->m_inlineCallFrame->callee);
localBase = cellConstant(m_inlineStackTop->m_inlineCallFrame->callee->scope());
} else
localBase = addToGraph(GetMyScope);
if (skipTop) {
ASSERT(!m_inlineStackTop->m_inlineCallFrame);
localBase = addToGraph(SkipTopScope, localBase);
}
for (unsigned n = skipCount; n--;)
localBase = addToGraph(SkipScope, localBase);
return localBase;
}
bool ByteCodeParser::parseResolveOperations(SpeculatedType prediction, unsigned identifier, unsigned operations, unsigned putToBaseOperation, NodeIndex* base, NodeIndex* value)
{
ResolveOperations* resolveOperations = m_codeBlock->resolveOperations(operations);
if (resolveOperations->isEmpty()) {
addToGraph(ForceOSRExit);
return false;
}
JSGlobalObject* globalObject = m_inlineStackTop->m_codeBlock->globalObject();
int skipCount = 0;
bool skipTop = false;
bool skippedScopes = false;
bool setBase = false;
ResolveOperation* pc = resolveOperations->data();
NodeIndex localBase = 0;
bool resolvingBase = true;
while (resolvingBase) {
switch (pc->m_operation) {
case ResolveOperation::ReturnGlobalObjectAsBase:
*base = cellConstant(globalObject);
ASSERT(!value);
return true;
case ResolveOperation::SetBaseToGlobal:
*base = cellConstant(globalObject);
setBase = true;
resolvingBase = false;
++pc;
break;
case ResolveOperation::SetBaseToUndefined:
*base = constantUndefined();
setBase = true;
resolvingBase = false;
++pc;
break;
case ResolveOperation::SetBaseToScope:
localBase = getScope(skipTop, skipCount);
*base = localBase;
setBase = true;
resolvingBase = false;
// Reset the scope skipping as we've already loaded it
skippedScopes = false;
++pc;
break;
case ResolveOperation::ReturnScopeAsBase:
*base = getScope(skipTop, skipCount);
ASSERT(!value);
return true;
case ResolveOperation::SkipTopScopeNode:
ASSERT(!m_inlineStackTop->m_inlineCallFrame);
skipTop = true;
skippedScopes = true;
++pc;
break;
case ResolveOperation::SkipScopes:
skipCount += pc->m_scopesToSkip;
skippedScopes = true;
++pc;
break;
case ResolveOperation::CheckForDynamicEntriesBeforeGlobalScope:
return false;
case ResolveOperation::Fail:
return false;
default:
resolvingBase = false;
}
}
if (skippedScopes)
localBase = getScope(skipTop, skipCount);
if (base && !setBase)
*base = localBase;
ASSERT(value);
ResolveOperation* resolveValueOperation = pc;
switch (resolveValueOperation->m_operation) {
case ResolveOperation::GetAndReturnGlobalProperty: {
ResolveGlobalStatus status = ResolveGlobalStatus::computeFor(m_inlineStackTop->m_profiledBlock, m_currentIndex, resolveValueOperation, m_codeBlock->identifier(identifier));
if (status.isSimple()) {
ASSERT(status.structure());
NodeIndex globalObjectNode = addStructureTransitionCheck(globalObject, status.structure());
if (status.specificValue()) {
ASSERT(status.specificValue().isCell());
*value = cellConstant(status.specificValue().asCell());
} else
*value = handleGetByOffset(prediction, globalObjectNode, identifier, status.offset());
return true;
}
NodeIndex resolve = addToGraph(ResolveGlobal, OpInfo(m_graph.m_resolveGlobalData.size()), OpInfo(prediction));
m_graph.m_resolveGlobalData.append(ResolveGlobalData());
ResolveGlobalData& data = m_graph.m_resolveGlobalData.last();
data.identifierNumber = identifier;
data.resolveOperationsIndex = operations;
data.putToBaseOperationIndex = putToBaseOperation;
data.resolvePropertyIndex = resolveValueOperation - resolveOperations->data();
*value = resolve;
return true;
}
case ResolveOperation::GetAndReturnGlobalVar: {
*value = addToGraph(GetGlobalVar,
OpInfo(globalObject->assertRegisterIsInThisObject(pc->m_registerAddress)),
OpInfo(prediction));
return true;
}
case ResolveOperation::GetAndReturnGlobalVarWatchable: {
SpeculatedType prediction = getPrediction();
JSGlobalObject* globalObject = m_inlineStackTop->m_codeBlock->globalObject();
Identifier ident = m_codeBlock->identifier(identifier);
SymbolTableEntry entry = globalObject->symbolTable()->get(ident.impl());
if (!entry.couldBeWatched()) {
*value = addToGraph(GetGlobalVar, OpInfo(globalObject->assertRegisterIsInThisObject(pc->m_registerAddress)), OpInfo(prediction));
return true;
}
// The watchpoint is still intact! This means that we will get notified if the
// current value in the global variable changes. So, we can inline that value.
// Moreover, currently we can assume that this value is a JSFunction*, which
// implies that it's a cell. This simplifies things, since in general we'd have
// to use a JSConstant for non-cells and a WeakJSConstant for cells. So instead
// of having both cases we just assert that the value is a cell.
// NB. If it wasn't for CSE, GlobalVarWatchpoint would have no need for the
// register pointer. But CSE tracks effects on global variables by comparing
// register pointers. Because CSE executes multiple times while the backend
// executes once, we use the following performance trade-off:
// - The node refers directly to the register pointer to make CSE super cheap.
// - To perform backend code generation, the node only contains the identifier
// number, from which it is possible to get (via a few average-time O(1)
// lookups) to the WatchpointSet.
addToGraph(GlobalVarWatchpoint, OpInfo(globalObject->assertRegisterIsInThisObject(pc->m_registerAddress)), OpInfo(identifier));
JSValue specificValue = globalObject->registerAt(entry.getIndex()).get();
ASSERT(specificValue.isCell());
*value = cellConstant(specificValue.asCell());
return true;
}
case ResolveOperation::GetAndReturnScopedVar: {
NodeIndex getScopeRegisters = addToGraph(GetScopeRegisters, localBase);
*value = addToGraph(GetScopedVar, OpInfo(resolveValueOperation->m_offset), OpInfo(prediction), getScopeRegisters);
return true;
}
default:
CRASH();
return false;
}
}
bool ByteCodeParser::parseBlock(unsigned limit)
{
bool shouldContinueParsing = true;
Interpreter* interpreter = m_globalData->interpreter;
Instruction* instructionsBegin = m_inlineStackTop->m_codeBlock->instructions().begin();
unsigned blockBegin = m_currentIndex;
// If we are the first basic block, introduce markers for arguments. This allows
// us to track if a use of an argument may use the actual argument passed, as
// opposed to using a value we set explicitly.
if (m_currentBlock == m_graph.m_blocks[0].get() && !m_inlineStackTop->m_inlineCallFrame) {
m_graph.m_arguments.resize(m_numArguments);
for (unsigned argument = 0; argument < m_numArguments; ++argument) {
VariableAccessData* variable = newVariableAccessData(
argumentToOperand(argument), m_codeBlock->isCaptured(argumentToOperand(argument)));
variable->mergeStructureCheckHoistingFailed(
m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, BadCache));
NodeIndex setArgument = addToGraph(SetArgument, OpInfo(variable));
m_graph.m_arguments[argument] = setArgument;
m_currentBlock->variablesAtHead.setArgumentFirstTime(argument, setArgument);
m_currentBlock->variablesAtTail.setArgumentFirstTime(argument, setArgument);
}
}
while (true) {
m_currentProfilingIndex = m_currentIndex;
// Don't extend over jump destinations.
if (m_currentIndex == limit) {
// Ordinarily we want to plant a jump. But refuse to do this if the block is
// empty. This is a special case for inlining, which might otherwise create
// some empty blocks in some cases. When parseBlock() returns with an empty
// block, it will get repurposed instead of creating a new one. Note that this
// logic relies on every bytecode resulting in one or more nodes, which would
// be true anyway except for op_loop_hint, which emits a Phantom to force this
// to be true.
if (!m_currentBlock->isEmpty())
addToGraph(Jump, OpInfo(m_currentIndex));
else {
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Refusing to plant jump at limit %u because block %p is empty.\n", limit, m_currentBlock);
#endif
}
return shouldContinueParsing;
}
// Switch on the current bytecode opcode.
Instruction* currentInstruction = instructionsBegin + m_currentIndex;
m_currentInstruction = currentInstruction; // Some methods want to use this, and we'd rather not thread it through calls.
OpcodeID opcodeID = interpreter->getOpcodeID(currentInstruction->u.opcode);
if (m_graph.m_compilation && opcodeID != op_call_put_result) {
addToGraph(CountExecution, OpInfo(m_graph.m_compilation->executionCounterFor(
Profiler::OriginStack(*m_globalData->m_perBytecodeProfiler, m_codeBlock, currentCodeOrigin()))));
}
switch (opcodeID) {
// === Function entry opcodes ===
case op_enter:
// Initialize all locals to undefined.
for (int i = 0; i < m_inlineStackTop->m_codeBlock->m_numVars; ++i)
set(i, constantUndefined(), SetOnEntry);
NEXT_OPCODE(op_enter);
case op_convert_this: {
NodeIndex op1 = getThis();
if (m_graph[op1].op() != ConvertThis) {
ValueProfile* profile =
m_inlineStackTop->m_profiledBlock->valueProfileForBytecodeOffset(m_currentProfilingIndex);
profile->computeUpdatedPrediction();
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("[@%lu bc#%u]: profile %p: ", m_graph.size(), m_currentProfilingIndex, profile);
profile->dump(WTF::dataFile());
dataLogF("\n");
#endif
if (profile->m_singletonValueIsTop
|| !profile->m_singletonValue
|| !profile->m_singletonValue.isCell()
|| profile->m_singletonValue.asCell()->classInfo() != &Structure::s_info)
setThis(addToGraph(ConvertThis, op1));
else {
addToGraph(
CheckStructure,
OpInfo(m_graph.addStructureSet(jsCast<Structure*>(profile->m_singletonValue.asCell()))),
op1);
}
}
NEXT_OPCODE(op_convert_this);
}
case op_create_this: {
int calleeOperand = currentInstruction[2].u.operand;
NodeIndex callee = get(calleeOperand);
bool alreadyEmitted = false;
if (m_graph[callee].op() == WeakJSConstant) {
JSCell* cell = m_graph[callee].weakConstant();
ASSERT(cell->inherits(&JSFunction::s_info));
JSFunction* function = jsCast<JSFunction*>(cell);
Structure* inheritorID = function->tryGetKnownInheritorID();
if (inheritorID) {
addToGraph(InheritorIDWatchpoint, OpInfo(function));
set(currentInstruction[1].u.operand, addToGraph(NewObject, OpInfo(inheritorID)));
alreadyEmitted = true;
}
}
if (!alreadyEmitted)
set(currentInstruction[1].u.operand, addToGraph(CreateThis, callee));
NEXT_OPCODE(op_create_this);
}
case op_new_object: {
set(currentInstruction[1].u.operand, addToGraph(NewObject, OpInfo(m_inlineStackTop->m_codeBlock->globalObject()->emptyObjectStructure())));
NEXT_OPCODE(op_new_object);
}
case op_new_array: {
int startOperand = currentInstruction[2].u.operand;
int numOperands = currentInstruction[3].u.operand;
ArrayAllocationProfile* profile = currentInstruction[4].u.arrayAllocationProfile;
for (int operandIdx = startOperand; operandIdx < startOperand + numOperands; ++operandIdx)
addVarArgChild(get(operandIdx));
set(currentInstruction[1].u.operand, addToGraph(Node::VarArg, NewArray, OpInfo(profile->selectIndexingType()), OpInfo(0)));
NEXT_OPCODE(op_new_array);
}
case op_new_array_with_size: {
int lengthOperand = currentInstruction[2].u.operand;
ArrayAllocationProfile* profile = currentInstruction[3].u.arrayAllocationProfile;
set(currentInstruction[1].u.operand, addToGraph(NewArrayWithSize, OpInfo(profile->selectIndexingType()), get(lengthOperand)));
NEXT_OPCODE(op_new_array_with_size);
}
case op_new_array_buffer: {
int startConstant = currentInstruction[2].u.operand;
int numConstants = currentInstruction[3].u.operand;
ArrayAllocationProfile* profile = currentInstruction[4].u.arrayAllocationProfile;
NewArrayBufferData data;
data.startConstant = m_inlineStackTop->m_constantBufferRemap[startConstant];
data.numConstants = numConstants;
data.indexingType = profile->selectIndexingType();
// If this statement has never executed, we'll have the wrong indexing type in the profile.
for (int i = 0; i < numConstants; ++i) {
data.indexingType =
leastUpperBoundOfIndexingTypeAndValue(
data.indexingType,
m_codeBlock->constantBuffer(data.startConstant)[i]);
}
m_graph.m_newArrayBufferData.append(data);
set(currentInstruction[1].u.operand, addToGraph(NewArrayBuffer, OpInfo(&m_graph.m_newArrayBufferData.last())));
NEXT_OPCODE(op_new_array_buffer);
}
case op_new_regexp: {
set(currentInstruction[1].u.operand, addToGraph(NewRegexp, OpInfo(currentInstruction[2].u.operand)));
NEXT_OPCODE(op_new_regexp);
}
case op_get_callee: {
ValueProfile* profile = currentInstruction[2].u.profile;
profile->computeUpdatedPrediction();
if (profile->m_singletonValueIsTop
|| !profile->m_singletonValue
|| !profile->m_singletonValue.isCell())
set(currentInstruction[1].u.operand, get(JSStack::Callee));
else {
ASSERT(profile->m_singletonValue.asCell()->inherits(&JSFunction::s_info));
NodeIndex actualCallee = get(JSStack::Callee);
addToGraph(CheckFunction, OpInfo(profile->m_singletonValue.asCell()), actualCallee);
set(currentInstruction[1].u.operand, addToGraph(WeakJSConstant, OpInfo(profile->m_singletonValue.asCell())));
}
NEXT_OPCODE(op_get_callee);
}
// === Bitwise operations ===
case op_bitand: {
NodeIndex op1 = getToInt32(currentInstruction[2].u.operand);
NodeIndex op2 = getToInt32(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(BitAnd, op1, op2));
NEXT_OPCODE(op_bitand);
}
case op_bitor: {
NodeIndex op1 = getToInt32(currentInstruction[2].u.operand);
NodeIndex op2 = getToInt32(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(BitOr, op1, op2));
NEXT_OPCODE(op_bitor);
}
case op_bitxor: {
NodeIndex op1 = getToInt32(currentInstruction[2].u.operand);
NodeIndex op2 = getToInt32(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(BitXor, op1, op2));
NEXT_OPCODE(op_bitxor);
}
case op_rshift: {
NodeIndex op1 = getToInt32(currentInstruction[2].u.operand);
NodeIndex op2 = getToInt32(currentInstruction[3].u.operand);
NodeIndex result;
// Optimize out shifts by zero.
if (isInt32Constant(op2) && !(valueOfInt32Constant(op2) & 0x1f))
result = op1;
else
result = addToGraph(BitRShift, op1, op2);
set(currentInstruction[1].u.operand, result);
NEXT_OPCODE(op_rshift);
}
case op_lshift: {
NodeIndex op1 = getToInt32(currentInstruction[2].u.operand);
NodeIndex op2 = getToInt32(currentInstruction[3].u.operand);
NodeIndex result;
// Optimize out shifts by zero.
if (isInt32Constant(op2) && !(valueOfInt32Constant(op2) & 0x1f))
result = op1;
else
result = addToGraph(BitLShift, op1, op2);
set(currentInstruction[1].u.operand, result);
NEXT_OPCODE(op_lshift);
}
case op_urshift: {
NodeIndex op1 = getToInt32(currentInstruction[2].u.operand);
NodeIndex op2 = getToInt32(currentInstruction[3].u.operand);
NodeIndex result;
// The result of a zero-extending right shift is treated as an unsigned value.
// This means that if the top bit is set, the result is not in the int32 range,
// and as such must be stored as a double. If the shift amount is a constant,
// we may be able to optimize.
if (isInt32Constant(op2)) {
// If we know we are shifting by a non-zero amount, then since the operation
// zero fills we know the top bit of the result must be zero, and as such the
// result must be within the int32 range. Conversely, if this is a shift by
// zero, then the result may be changed by the conversion to unsigned, but it
// is not necessary to perform the shift!
if (valueOfInt32Constant(op2) & 0x1f)
result = addToGraph(BitURShift, op1, op2);
else
result = makeSafe(addToGraph(UInt32ToNumber, op1));
} else {
// Cannot optimize at this stage; shift & potentially rebox as a double.
result = addToGraph(BitURShift, op1, op2);
result = makeSafe(addToGraph(UInt32ToNumber, result));
}
set(currentInstruction[1].u.operand, result);
NEXT_OPCODE(op_urshift);
}
// === Increment/Decrement opcodes ===
case op_pre_inc: {
unsigned srcDst = currentInstruction[1].u.operand;
NodeIndex op = get(srcDst);
set(srcDst, makeSafe(addToGraph(ArithAdd, op, one())));
NEXT_OPCODE(op_pre_inc);
}
case op_post_inc: {
unsigned result = currentInstruction[1].u.operand;
unsigned srcDst = currentInstruction[2].u.operand;
ASSERT(result != srcDst); // Required for assumptions we make during OSR.
NodeIndex op = get(srcDst);
setPair(result, op, srcDst, makeSafe(addToGraph(ArithAdd, op, one())));
NEXT_OPCODE(op_post_inc);
}
case op_pre_dec: {
unsigned srcDst = currentInstruction[1].u.operand;
NodeIndex op = get(srcDst);
set(srcDst, makeSafe(addToGraph(ArithSub, op, one())));
NEXT_OPCODE(op_pre_dec);
}
case op_post_dec: {
unsigned result = currentInstruction[1].u.operand;
unsigned srcDst = currentInstruction[2].u.operand;
NodeIndex op = get(srcDst);
setPair(result, op, srcDst, makeSafe(addToGraph(ArithSub, op, one())));
NEXT_OPCODE(op_post_dec);
}
// === Arithmetic operations ===
case op_add: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
if (m_graph[op1].hasNumberResult() && m_graph[op2].hasNumberResult())
set(currentInstruction[1].u.operand, makeSafe(addToGraph(ArithAdd, op1, op2)));
else
set(currentInstruction[1].u.operand, makeSafe(addToGraph(ValueAdd, op1, op2)));
NEXT_OPCODE(op_add);
}
case op_sub: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, makeSafe(addToGraph(ArithSub, op1, op2)));
NEXT_OPCODE(op_sub);
}
case op_negate: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, makeSafe(addToGraph(ArithNegate, op1)));
NEXT_OPCODE(op_negate);
}
case op_mul: {
// Multiply requires that the inputs are not truncated, unfortunately.
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, makeSafe(addToGraph(ArithMul, op1, op2)));
NEXT_OPCODE(op_mul);
}
case op_mod: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, makeSafe(addToGraph(ArithMod, op1, op2)));
NEXT_OPCODE(op_mod);
}
case op_div: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, makeDivSafe(addToGraph(ArithDiv, op1, op2)));
NEXT_OPCODE(op_div);
}
// === Misc operations ===
#if ENABLE(DEBUG_WITH_BREAKPOINT)
case op_debug:
addToGraph(Breakpoint);
NEXT_OPCODE(op_debug);
#endif
case op_mov: {
NodeIndex op = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, op);
NEXT_OPCODE(op_mov);
}
case op_check_has_instance:
addToGraph(CheckHasInstance, get(currentInstruction[3].u.operand));
NEXT_OPCODE(op_check_has_instance);
case op_instanceof: {
NodeIndex value = get(currentInstruction[2].u.operand);
NodeIndex prototype = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(InstanceOf, value, prototype));
NEXT_OPCODE(op_instanceof);
}
case op_is_undefined: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(IsUndefined, value));
NEXT_OPCODE(op_is_undefined);
}
case op_is_boolean: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(IsBoolean, value));
NEXT_OPCODE(op_is_boolean);
}
case op_is_number: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(IsNumber, value));
NEXT_OPCODE(op_is_number);
}
case op_is_string: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(IsString, value));
NEXT_OPCODE(op_is_string);
}
case op_is_object: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(IsObject, value));
NEXT_OPCODE(op_is_object);
}
case op_is_function: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(IsFunction, value));
NEXT_OPCODE(op_is_function);
}
case op_not: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(LogicalNot, value));
NEXT_OPCODE(op_not);
}
case op_to_primitive: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(ToPrimitive, value));
NEXT_OPCODE(op_to_primitive);
}
case op_strcat: {
int startOperand = currentInstruction[2].u.operand;
int numOperands = currentInstruction[3].u.operand;
for (int operandIdx = startOperand; operandIdx < startOperand + numOperands; ++operandIdx)
addVarArgChild(get(operandIdx));
set(currentInstruction[1].u.operand, addToGraph(Node::VarArg, StrCat, OpInfo(0), OpInfo(0)));
NEXT_OPCODE(op_strcat);
}
case op_less: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(CompareLess, op1, op2));
NEXT_OPCODE(op_less);
}
case op_lesseq: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(CompareLessEq, op1, op2));
NEXT_OPCODE(op_lesseq);
}
case op_greater: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(CompareGreater, op1, op2));
NEXT_OPCODE(op_greater);
}
case op_greatereq: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(CompareGreaterEq, op1, op2));
NEXT_OPCODE(op_greatereq);
}
case op_eq: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(CompareEq, op1, op2));
NEXT_OPCODE(op_eq);
}
case op_eq_null: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(CompareEq, value, constantNull()));
NEXT_OPCODE(op_eq_null);
}
case op_stricteq: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(CompareStrictEq, op1, op2));
NEXT_OPCODE(op_stricteq);
}
case op_neq: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(LogicalNot, addToGraph(CompareEq, op1, op2)));
NEXT_OPCODE(op_neq);
}
case op_neq_null: {
NodeIndex value = get(currentInstruction[2].u.operand);
set(currentInstruction[1].u.operand, addToGraph(LogicalNot, addToGraph(CompareEq, value, constantNull())));
NEXT_OPCODE(op_neq_null);
}
case op_nstricteq: {
NodeIndex op1 = get(currentInstruction[2].u.operand);
NodeIndex op2 = get(currentInstruction[3].u.operand);
set(currentInstruction[1].u.operand, addToGraph(LogicalNot, addToGraph(CompareStrictEq, op1, op2)));
NEXT_OPCODE(op_nstricteq);
}
// === Property access operations ===
case op_get_by_val: {
SpeculatedType prediction = getPrediction();
NodeIndex base = get(currentInstruction[2].u.operand);
ArrayMode arrayMode = getArrayModeAndEmitChecks(currentInstruction[4].u.arrayProfile, Array::Read, base);
NodeIndex property = get(currentInstruction[3].u.operand);
NodeIndex getByVal = addToGraph(GetByVal, OpInfo(arrayMode.asWord()), OpInfo(prediction), base, property);
set(currentInstruction[1].u.operand, getByVal);
NEXT_OPCODE(op_get_by_val);
}
case op_put_by_val: {
NodeIndex base = get(currentInstruction[1].u.operand);
ArrayMode arrayMode = getArrayModeAndEmitChecks(currentInstruction[4].u.arrayProfile, Array::Write, base);
NodeIndex property = get(currentInstruction[2].u.operand);
NodeIndex value = get(currentInstruction[3].u.operand);
addVarArgChild(base);
addVarArgChild(property);
addVarArgChild(value);
addVarArgChild(NoNode); // Leave room for property storage.
addToGraph(Node::VarArg, PutByVal, OpInfo(arrayMode.asWord()), OpInfo(0));
NEXT_OPCODE(op_put_by_val);
}
case op_get_by_id:
case op_get_by_id_out_of_line:
case op_get_array_length: {
SpeculatedType prediction = getPrediction();
NodeIndex base = get(currentInstruction[2].u.operand);
unsigned identifierNumber = m_inlineStackTop->m_identifierRemap[currentInstruction[3].u.operand];
Identifier identifier = m_codeBlock->identifier(identifierNumber);
GetByIdStatus getByIdStatus = GetByIdStatus::computeFor(
m_inlineStackTop->m_profiledBlock, m_currentIndex, identifier);
handleGetById(
currentInstruction[1].u.operand, prediction, base, identifierNumber, getByIdStatus);
NEXT_OPCODE(op_get_by_id);
}
case op_put_by_id:
case op_put_by_id_out_of_line:
case op_put_by_id_transition_direct:
case op_put_by_id_transition_normal:
case op_put_by_id_transition_direct_out_of_line:
case op_put_by_id_transition_normal_out_of_line: {
NodeIndex value = get(currentInstruction[3].u.operand);
NodeIndex base = get(currentInstruction[1].u.operand);
unsigned identifierNumber = m_inlineStackTop->m_identifierRemap[currentInstruction[2].u.operand];
bool direct = currentInstruction[8].u.operand;
PutByIdStatus putByIdStatus = PutByIdStatus::computeFor(
m_inlineStackTop->m_profiledBlock,
m_currentIndex,
m_codeBlock->identifier(identifierNumber));
if (!putByIdStatus.isSet())
addToGraph(ForceOSRExit);
bool hasExitSite = m_inlineStackTop->m_exitProfile.hasExitSite(m_currentIndex, BadCache);
if (!hasExitSite && putByIdStatus.isSimpleReplace()) {
addToGraph(CheckStructure, OpInfo(m_graph.addStructureSet(putByIdStatus.oldStructure())), base);
NodeIndex propertyStorage;
if (isInlineOffset(putByIdStatus.offset()))
propertyStorage = base;
else
propertyStorage = addToGraph(GetButterfly, base);
addToGraph(PutByOffset, OpInfo(m_graph.m_storageAccessData.size()), propertyStorage, base, value);
StorageAccessData storageAccessData;
storageAccessData.offset = indexRelativeToBase(putByIdStatus.offset());
storageAccessData.identifierNumber = identifierNumber;
m_graph.m_storageAccessData.append(storageAccessData);
} else if (!hasExitSite
&& putByIdStatus.isSimpleTransition()
&& structureChainIsStillValid(
direct,
putByIdStatus.oldStructure(),
putByIdStatus.structureChain())) {
addToGraph(CheckStructure, OpInfo(m_graph.addStructureSet(putByIdStatus.oldStructure())), base);
if (!direct) {
if (!putByIdStatus.oldStructure()->storedPrototype().isNull()) {
addStructureTransitionCheck(
putByIdStatus.oldStructure()->storedPrototype().asCell());
}
for (WriteBarrier<Structure>* it = putByIdStatus.structureChain()->head(); *it; ++it) {
JSValue prototype = (*it)->storedPrototype();
if (prototype.isNull())
continue;
ASSERT(prototype.isCell());
addStructureTransitionCheck(prototype.asCell());
}
}
ASSERT(putByIdStatus.oldStructure()->transitionWatchpointSetHasBeenInvalidated());
NodeIndex propertyStorage;
StructureTransitionData* transitionData =
m_graph.addStructureTransitionData(
StructureTransitionData(
putByIdStatus.oldStructure(),
putByIdStatus.newStructure()));
if (putByIdStatus.oldStructure()->outOfLineCapacity()
!= putByIdStatus.newStructure()->outOfLineCapacity()) {
// If we're growing the property storage then it must be because we're
// storing into the out-of-line storage.
ASSERT(!isInlineOffset(putByIdStatus.offset()));
if (!putByIdStatus.oldStructure()->outOfLineCapacity()) {
propertyStorage = addToGraph(
AllocatePropertyStorage, OpInfo(transitionData), base);
} else {
propertyStorage = addToGraph(
ReallocatePropertyStorage, OpInfo(transitionData),
base, addToGraph(GetButterfly, base));
}
} else {
if (isInlineOffset(putByIdStatus.offset()))
propertyStorage = base;
else
propertyStorage = addToGraph(GetButterfly, base);
}
addToGraph(PutStructure, OpInfo(transitionData), base);
addToGraph(
PutByOffset,
OpInfo(m_graph.m_storageAccessData.size()),
propertyStorage,
base,
value);
StorageAccessData storageAccessData;
storageAccessData.offset = indexRelativeToBase(putByIdStatus.offset());
storageAccessData.identifierNumber = identifierNumber;
m_graph.m_storageAccessData.append(storageAccessData);
} else {
if (direct)
addToGraph(PutByIdDirect, OpInfo(identifierNumber), base, value);
else
addToGraph(PutById, OpInfo(identifierNumber), base, value);
}
NEXT_OPCODE(op_put_by_id);
}
case op_init_global_const_nop: {
NEXT_OPCODE(op_init_global_const_nop);
}
case op_init_global_const: {
NodeIndex value = get(currentInstruction[2].u.operand);
addToGraph(
PutGlobalVar,
OpInfo(m_inlineStackTop->m_codeBlock->globalObject()->assertRegisterIsInThisObject(currentInstruction[1].u.registerPointer)),
value);
NEXT_OPCODE(op_init_global_const);
}
case op_init_global_const_check: {
NodeIndex value = get(currentInstruction[2].u.operand);
CodeBlock* codeBlock = m_inlineStackTop->m_codeBlock;
JSGlobalObject* globalObject = codeBlock->globalObject();
unsigned identifierNumber = m_inlineStackTop->m_identifierRemap[currentInstruction[4].u.operand];
Identifier identifier = m_codeBlock->identifier(identifierNumber);
SymbolTableEntry entry = globalObject->symbolTable()->get(identifier.impl());
if (!entry.couldBeWatched()) {
addToGraph(
PutGlobalVar,
OpInfo(globalObject->assertRegisterIsInThisObject(currentInstruction[1].u.registerPointer)),
value);
NEXT_OPCODE(op_init_global_const_check);
}
addToGraph(
PutGlobalVarCheck,
OpInfo(codeBlock->globalObject()->assertRegisterIsInThisObject(currentInstruction[1].u.registerPointer)),
OpInfo(identifierNumber),
value);
NEXT_OPCODE(op_init_global_const_check);
}
// === Block terminators. ===
case op_jmp: {
unsigned relativeOffset = currentInstruction[1].u.operand;
addToGraph(Jump, OpInfo(m_currentIndex + relativeOffset));
LAST_OPCODE(op_jmp);
}
case op_loop: {
unsigned relativeOffset = currentInstruction[1].u.operand;
addToGraph(Jump, OpInfo(m_currentIndex + relativeOffset));
LAST_OPCODE(op_loop);
}
case op_jtrue: {
unsigned relativeOffset = currentInstruction[2].u.operand;
NodeIndex condition = get(currentInstruction[1].u.operand);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_jtrue)), condition);
LAST_OPCODE(op_jtrue);
}
case op_jfalse: {
unsigned relativeOffset = currentInstruction[2].u.operand;
NodeIndex condition = get(currentInstruction[1].u.operand);
addToGraph(Branch, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jfalse)), OpInfo(m_currentIndex + relativeOffset), condition);
LAST_OPCODE(op_jfalse);
}
case op_loop_if_true: {
unsigned relativeOffset = currentInstruction[2].u.operand;
NodeIndex condition = get(currentInstruction[1].u.operand);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_loop_if_true)), condition);
LAST_OPCODE(op_loop_if_true);
}
case op_loop_if_false: {
unsigned relativeOffset = currentInstruction[2].u.operand;
NodeIndex condition = get(currentInstruction[1].u.operand);
addToGraph(Branch, OpInfo(m_currentIndex + OPCODE_LENGTH(op_loop_if_false)), OpInfo(m_currentIndex + relativeOffset), condition);
LAST_OPCODE(op_loop_if_false);
}
case op_jeq_null: {
unsigned relativeOffset = currentInstruction[2].u.operand;
NodeIndex value = get(currentInstruction[1].u.operand);
NodeIndex condition = addToGraph(CompareEq, value, constantNull());
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_jeq_null)), condition);
LAST_OPCODE(op_jeq_null);
}
case op_jneq_null: {
unsigned relativeOffset = currentInstruction[2].u.operand;
NodeIndex value = get(currentInstruction[1].u.operand);
NodeIndex condition = addToGraph(CompareEq, value, constantNull());
addToGraph(Branch, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jneq_null)), OpInfo(m_currentIndex + relativeOffset), condition);
LAST_OPCODE(op_jneq_null);
}
case op_jless: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareLess, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_jless)), condition);
LAST_OPCODE(op_jless);
}
case op_jlesseq: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareLessEq, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_jlesseq)), condition);
LAST_OPCODE(op_jlesseq);
}
case op_jgreater: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareGreater, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_jgreater)), condition);
LAST_OPCODE(op_jgreater);
}
case op_jgreatereq: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareGreaterEq, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_jgreatereq)), condition);
LAST_OPCODE(op_jgreatereq);
}
case op_jnless: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareLess, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jnless)), OpInfo(m_currentIndex + relativeOffset), condition);
LAST_OPCODE(op_jnless);
}
case op_jnlesseq: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareLessEq, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jnlesseq)), OpInfo(m_currentIndex + relativeOffset), condition);
LAST_OPCODE(op_jnlesseq);
}
case op_jngreater: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareGreater, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jngreater)), OpInfo(m_currentIndex + relativeOffset), condition);
LAST_OPCODE(op_jngreater);
}
case op_jngreatereq: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareGreaterEq, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jngreatereq)), OpInfo(m_currentIndex + relativeOffset), condition);
LAST_OPCODE(op_jngreatereq);
}
case op_loop_if_less: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareLess, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_loop_if_less)), condition);
LAST_OPCODE(op_loop_if_less);
}
case op_loop_if_lesseq: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareLessEq, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_loop_if_lesseq)), condition);
LAST_OPCODE(op_loop_if_lesseq);
}
case op_loop_if_greater: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareGreater, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_loop_if_greater)), condition);
LAST_OPCODE(op_loop_if_greater);
}
case op_loop_if_greatereq: {
unsigned relativeOffset = currentInstruction[3].u.operand;
NodeIndex op1 = get(currentInstruction[1].u.operand);
NodeIndex op2 = get(currentInstruction[2].u.operand);
NodeIndex condition = addToGraph(CompareGreaterEq, op1, op2);
addToGraph(Branch, OpInfo(m_currentIndex + relativeOffset), OpInfo(m_currentIndex + OPCODE_LENGTH(op_loop_if_greatereq)), condition);
LAST_OPCODE(op_loop_if_greatereq);
}
case op_ret:
flushArgumentsAndCapturedVariables();
if (m_inlineStackTop->m_inlineCallFrame) {
if (m_inlineStackTop->m_returnValue != InvalidVirtualRegister)
setDirect(m_inlineStackTop->m_returnValue, get(currentInstruction[1].u.operand));
m_inlineStackTop->m_didReturn = true;
if (m_inlineStackTop->m_unlinkedBlocks.isEmpty()) {
// If we're returning from the first block, then we're done parsing.
ASSERT(m_inlineStackTop->m_callsiteBlockHead == m_graph.m_blocks.size() - 1);
shouldContinueParsing = false;
LAST_OPCODE(op_ret);
} else {
// If inlining created blocks, and we're doing a return, then we need some
// special linking.
ASSERT(m_inlineStackTop->m_unlinkedBlocks.last().m_blockIndex == m_graph.m_blocks.size() - 1);
m_inlineStackTop->m_unlinkedBlocks.last().m_needsNormalLinking = false;
}
if (m_currentIndex + OPCODE_LENGTH(op_ret) != m_inlineStackTop->m_codeBlock->instructions().size() || m_inlineStackTop->m_didEarlyReturn) {
ASSERT(m_currentIndex + OPCODE_LENGTH(op_ret) <= m_inlineStackTop->m_codeBlock->instructions().size());
addToGraph(Jump, OpInfo(NoBlock));
m_inlineStackTop->m_unlinkedBlocks.last().m_needsEarlyReturnLinking = true;
m_inlineStackTop->m_didEarlyReturn = true;
}
LAST_OPCODE(op_ret);
}
addToGraph(Return, get(currentInstruction[1].u.operand));
LAST_OPCODE(op_ret);
case op_end:
flushArgumentsAndCapturedVariables();
ASSERT(!m_inlineStackTop->m_inlineCallFrame);
addToGraph(Return, get(currentInstruction[1].u.operand));
LAST_OPCODE(op_end);
case op_throw:
flushArgumentsAndCapturedVariables();
addToGraph(Throw, get(currentInstruction[1].u.operand));
LAST_OPCODE(op_throw);
case op_throw_static_error:
flushArgumentsAndCapturedVariables();
addToGraph(ThrowReferenceError);
LAST_OPCODE(op_throw_static_error);
case op_call:
handleCall(interpreter, currentInstruction, Call, CodeForCall);
NEXT_OPCODE(op_call);
case op_construct:
handleCall(interpreter, currentInstruction, Construct, CodeForConstruct);
NEXT_OPCODE(op_construct);
case op_call_varargs: {
ASSERT(m_inlineStackTop->m_inlineCallFrame);
ASSERT(currentInstruction[3].u.operand == m_inlineStackTop->m_codeBlock->argumentsRegister());
ASSERT(!m_inlineStackTop->m_codeBlock->symbolTable()->slowArguments());
// It would be cool to funnel this into handleCall() so that it can handle
// inlining. But currently that won't be profitable anyway, since none of the
// uses of call_varargs will be inlineable. So we set this up manually and
// without inline/intrinsic detection.
Instruction* putInstruction = currentInstruction + OPCODE_LENGTH(op_call_varargs);
SpeculatedType prediction = SpecNone;
if (interpreter->getOpcodeID(putInstruction->u.opcode) == op_call_put_result) {
m_currentProfilingIndex = m_currentIndex + OPCODE_LENGTH(op_call_varargs);
prediction = getPrediction();
}
addToGraph(CheckArgumentsNotCreated);
unsigned argCount = m_inlineStackTop->m_inlineCallFrame->arguments.size();
if (JSStack::CallFrameHeaderSize + argCount > m_parameterSlots)
m_parameterSlots = JSStack::CallFrameHeaderSize + argCount;
addVarArgChild(get(currentInstruction[1].u.operand)); // callee
addVarArgChild(get(currentInstruction[2].u.operand)); // this
for (unsigned argument = 1; argument < argCount; ++argument)
addVarArgChild(get(argumentToOperand(argument)));
NodeIndex call = addToGraph(Node::VarArg, Call, OpInfo(0), OpInfo(prediction));
if (interpreter->getOpcodeID(putInstruction->u.opcode) == op_call_put_result)
set(putInstruction[1].u.operand, call);
NEXT_OPCODE(op_call_varargs);
}
case op_call_put_result:
NEXT_OPCODE(op_call_put_result);
case op_jneq_ptr:
// Statically speculate for now. It makes sense to let speculate-only jneq_ptr
// support simmer for a while before making it more general, since it's
// already gnarly enough as it is.
ASSERT(pointerIsFunction(currentInstruction[2].u.specialPointer));
addToGraph(
CheckFunction,
OpInfo(actualPointerFor(m_inlineStackTop->m_codeBlock, currentInstruction[2].u.specialPointer)),
get(currentInstruction[1].u.operand));
addToGraph(Jump, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jneq_ptr)));
LAST_OPCODE(op_jneq_ptr);
case op_resolve:
case op_resolve_global_property:
case op_resolve_global_var:
case op_resolve_scoped_var:
case op_resolve_scoped_var_on_top_scope:
case op_resolve_scoped_var_with_top_scope_check: {
SpeculatedType prediction = getPrediction();
unsigned identifier = m_inlineStackTop->m_identifierRemap[currentInstruction[2].u.operand];
unsigned operations = m_inlineStackTop->m_resolveOperationRemap[currentInstruction[3].u.operand];
NodeIndex value = 0;
if (parseResolveOperations(prediction, identifier, operations, 0, 0, &value)) {
set(currentInstruction[1].u.operand, value);
NEXT_OPCODE(op_resolve);
}
NodeIndex resolve = addToGraph(Resolve, OpInfo(m_graph.m_resolveOperationsData.size()), OpInfo(prediction));
m_graph.m_resolveOperationsData.append(ResolveOperationData());
ResolveOperationData& data = m_graph.m_resolveOperationsData.last();
data.identifierNumber = identifier;
data.resolveOperationsIndex = operations;
set(currentInstruction[1].u.operand, resolve);
NEXT_OPCODE(op_resolve);
}
case op_put_to_base_variable:
case op_put_to_base: {
unsigned base = currentInstruction[1].u.operand;
unsigned identifier = m_inlineStackTop->m_identifierRemap[currentInstruction[2].u.operand];
unsigned value = currentInstruction[3].u.operand;
unsigned operation = m_inlineStackTop->m_putToBaseOperationRemap[currentInstruction[4].u.operand];
PutToBaseOperation* putToBase = m_codeBlock->putToBaseOperation(operation);
if (putToBase->m_isDynamic) {
addToGraph(Phantom, get(base));
addToGraph(PutById, OpInfo(identifier), get(base), get(value));
NEXT_OPCODE(op_put_to_base);
}
switch (putToBase->m_kind) {
case PutToBaseOperation::Uninitialised:
addToGraph(Phantom, get(base));
addToGraph(ForceOSRExit);
break;
case PutToBaseOperation::GlobalVariablePutChecked: {
CodeBlock* codeBlock = m_inlineStackTop->m_codeBlock;
JSGlobalObject* globalObject = codeBlock->globalObject();
SymbolTableEntry entry = globalObject->symbolTable()->get(m_codeBlock->identifier(identifier).impl());
if (entry.couldBeWatched()) {
addToGraph(PutGlobalVarCheck,
OpInfo(codeBlock->globalObject()->assertRegisterIsInThisObject(putToBase->m_registerAddress)),
OpInfo(identifier),
get(value));
break;
}
}
case PutToBaseOperation::GlobalVariablePut:
addToGraph(PutGlobalVar,
OpInfo(m_inlineStackTop->m_codeBlock->globalObject()->assertRegisterIsInThisObject(putToBase->m_registerAddress)),
get(value));
break;
case PutToBaseOperation::VariablePut: {
NodeIndex scope = get(base);
NodeIndex scopeRegisters = addToGraph(GetScopeRegisters, scope);
addToGraph(PutScopedVar, OpInfo(putToBase->m_offset), scope, scopeRegisters, get(value));
break;
}
case PutToBaseOperation::GlobalPropertyPut: {
if (!putToBase->m_structure) {
addToGraph(Phantom, get(base));
addToGraph(ForceOSRExit);
NEXT_OPCODE(op_put_to_base);
}
NodeIndex baseNode = get(base);
addToGraph(CheckStructure, OpInfo(m_graph.addStructureSet(putToBase->m_structure.get())), baseNode);
NodeIndex propertyStorage;
if (isInlineOffset(putToBase->m_offset))
propertyStorage = baseNode;
else
propertyStorage = addToGraph(GetButterfly, baseNode);
addToGraph(PutByOffset, OpInfo(m_graph.m_storageAccessData.size()), propertyStorage, baseNode, get(value));
StorageAccessData storageAccessData;
storageAccessData.offset = indexRelativeToBase(putToBase->m_offset);
storageAccessData.identifierNumber = identifier;
m_graph.m_storageAccessData.append(storageAccessData);
break;
}
case PutToBaseOperation::Readonly:
case PutToBaseOperation::Generic:
addToGraph(Phantom, get(base));
addToGraph(PutById, OpInfo(identifier), get(base), get(value));
}
NEXT_OPCODE(op_put_to_base);
}
case op_resolve_base_to_global:
case op_resolve_base_to_global_dynamic:
case op_resolve_base_to_scope:
case op_resolve_base_to_scope_with_top_scope_check:
case op_resolve_base: {
SpeculatedType prediction = getPrediction();
unsigned identifier = m_inlineStackTop->m_identifierRemap[currentInstruction[2].u.operand];
unsigned operations = m_inlineStackTop->m_resolveOperationRemap[currentInstruction[4].u.operand];
unsigned putToBaseOperation = m_inlineStackTop->m_putToBaseOperationRemap[currentInstruction[5].u.operand];
NodeIndex base = 0;
if (parseResolveOperations(prediction, identifier, operations, 0, &base, 0)) {
set(currentInstruction[1].u.operand, base);
NEXT_OPCODE(op_resolve_base);
}
NodeIndex resolve = addToGraph(currentInstruction[3].u.operand ? ResolveBaseStrictPut : ResolveBase, OpInfo(m_graph.m_resolveOperationsData.size()), OpInfo(prediction));
m_graph.m_resolveOperationsData.append(ResolveOperationData());
ResolveOperationData& data = m_graph.m_resolveOperationsData.last();
data.identifierNumber = identifier;
data.resolveOperationsIndex = operations;
data.putToBaseOperationIndex = putToBaseOperation;
set(currentInstruction[1].u.operand, resolve);
NEXT_OPCODE(op_resolve_base);
}
case op_resolve_with_base: {
SpeculatedType prediction = getPrediction();
unsigned baseDst = currentInstruction[1].u.operand;
unsigned valueDst = currentInstruction[2].u.operand;
unsigned identifier = m_inlineStackTop->m_identifierRemap[currentInstruction[3].u.operand];
unsigned operations = m_inlineStackTop->m_resolveOperationRemap[currentInstruction[4].u.operand];
unsigned putToBaseOperation = m_inlineStackTop->m_putToBaseOperationRemap[currentInstruction[5].u.operand];
NodeIndex base = 0;
NodeIndex value = 0;
if (parseResolveOperations(prediction, identifier, operations, putToBaseOperation, &base, &value))
setPair(baseDst, base, valueDst, value);
else {
addToGraph(ForceOSRExit);
setPair(baseDst, addToGraph(GarbageValue), valueDst, addToGraph(GarbageValue));
}
NEXT_OPCODE(op_resolve_with_base);
}
case op_resolve_with_this: {
SpeculatedType prediction = getPrediction();
unsigned baseDst = currentInstruction[1].u.operand;
unsigned valueDst = currentInstruction[2].u.operand;
unsigned identifier = m_inlineStackTop->m_identifierRemap[currentInstruction[3].u.operand];
unsigned operations = m_inlineStackTop->m_resolveOperationRemap[currentInstruction[4].u.operand];
NodeIndex base = 0;
NodeIndex value = 0;
if (parseResolveOperations(prediction, identifier, operations, 0, &base, &value))
setPair(baseDst, base, valueDst, value);
else {
addToGraph(ForceOSRExit);
setPair(baseDst, addToGraph(GarbageValue), valueDst, addToGraph(GarbageValue));
}
NEXT_OPCODE(op_resolve_with_this);
}
case op_loop_hint: {
// Baseline->DFG OSR jumps between loop hints. The DFG assumes that Baseline->DFG
// OSR can only happen at basic block boundaries. Assert that these two statements
// are compatible.
ASSERT_UNUSED(blockBegin, m_currentIndex == blockBegin);
// We never do OSR into an inlined code block. That could not happen, since OSR
// looks up the code block that is the replacement for the baseline JIT code
// block. Hence, machine code block = true code block = not inline code block.
if (!m_inlineStackTop->m_caller)
m_currentBlock->isOSRTarget = true;
// Emit a phantom node to ensure that there is a placeholder node for this bytecode
// op.
addToGraph(Phantom);
NEXT_OPCODE(op_loop_hint);
}
case op_init_lazy_reg: {
set(currentInstruction[1].u.operand, getJSConstantForValue(JSValue()));
NEXT_OPCODE(op_init_lazy_reg);
}
case op_create_activation: {
set(currentInstruction[1].u.operand, addToGraph(CreateActivation, get(currentInstruction[1].u.operand)));
NEXT_OPCODE(op_create_activation);
}
case op_create_arguments: {
m_graph.m_hasArguments = true;
NodeIndex createArguments = addToGraph(CreateArguments, get(currentInstruction[1].u.operand));
set(currentInstruction[1].u.operand, createArguments);
set(unmodifiedArgumentsRegister(currentInstruction[1].u.operand), createArguments);
NEXT_OPCODE(op_create_arguments);
}
case op_tear_off_activation: {
addToGraph(TearOffActivation, get(currentInstruction[1].u.operand));
NEXT_OPCODE(op_tear_off_activation);
}
case op_tear_off_arguments: {
m_graph.m_hasArguments = true;
addToGraph(TearOffArguments, get(unmodifiedArgumentsRegister(currentInstruction[1].u.operand)), get(currentInstruction[2].u.operand));
NEXT_OPCODE(op_tear_off_arguments);
}
case op_get_arguments_length: {
m_graph.m_hasArguments = true;
set(currentInstruction[1].u.operand, addToGraph(GetMyArgumentsLengthSafe));
NEXT_OPCODE(op_get_arguments_length);
}
case op_get_argument_by_val: {
m_graph.m_hasArguments = true;
set(currentInstruction[1].u.operand,
addToGraph(
GetMyArgumentByValSafe, OpInfo(0), OpInfo(getPrediction()),
get(currentInstruction[3].u.operand)));
NEXT_OPCODE(op_get_argument_by_val);
}
case op_new_func: {
if (!currentInstruction[3].u.operand) {
set(currentInstruction[1].u.operand,
addToGraph(NewFunctionNoCheck, OpInfo(currentInstruction[2].u.operand)));
} else {
set(currentInstruction[1].u.operand,
addToGraph(
NewFunction,
OpInfo(currentInstruction[2].u.operand),
get(currentInstruction[1].u.operand)));
}
NEXT_OPCODE(op_new_func);
}
case op_new_func_exp: {
set(currentInstruction[1].u.operand,
addToGraph(NewFunctionExpression, OpInfo(currentInstruction[2].u.operand)));
NEXT_OPCODE(op_new_func_exp);
}
default:
// Parse failed! This should not happen because the capabilities checker
// should have caught it.
ASSERT_NOT_REACHED();
return false;
}
}
}
template<ByteCodeParser::PhiStackType stackType>
void ByteCodeParser::processPhiStack()
{
Vector<PhiStackEntry, 16>& phiStack = (stackType == ArgumentPhiStack) ? m_argumentPhiStack : m_localPhiStack;
while (!phiStack.isEmpty()) {
PhiStackEntry entry = phiStack.last();
phiStack.removeLast();
if (!entry.m_block->isReachable)
continue;
if (!entry.m_block->isReachable)
continue;
PredecessorList& predecessors = entry.m_block->m_predecessors;
unsigned varNo = entry.m_varNo;
VariableAccessData* dataForPhi = m_graph[entry.m_phi].variableAccessData();
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Handling phi entry for var %u, phi @%u.\n", entry.m_varNo, entry.m_phi);
#endif
for (size_t i = 0; i < predecessors.size(); ++i) {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Dealing with predecessor block %u.\n", predecessors[i]);
#endif
BasicBlock* predecessorBlock = m_graph.m_blocks[predecessors[i]].get();
NodeIndex& var = (stackType == ArgumentPhiStack) ? predecessorBlock->variablesAtTail.argument(varNo) : predecessorBlock->variablesAtTail.local(varNo);
NodeIndex valueInPredecessor = var;
if (valueInPredecessor == NoNode) {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Did not find node, adding phi.\n");
#endif
valueInPredecessor = insertPhiNode(OpInfo(newVariableAccessData(stackType == ArgumentPhiStack ? argumentToOperand(varNo) : static_cast<int>(varNo), false)), predecessorBlock);
var = valueInPredecessor;
if (stackType == ArgumentPhiStack)
predecessorBlock->variablesAtHead.setArgumentFirstTime(varNo, valueInPredecessor);
else
predecessorBlock->variablesAtHead.setLocalFirstTime(varNo, valueInPredecessor);
phiStack.append(PhiStackEntry(predecessorBlock, valueInPredecessor, varNo));
} else if (m_graph[valueInPredecessor].op() == GetLocal) {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Found GetLocal @%u.\n", valueInPredecessor);
#endif
// We want to ensure that the VariableAccessDatas are identical between the
// GetLocal and its block-local Phi. Strictly speaking we only need the two
// to be unified. But for efficiency, we want the code that creates GetLocals
// and Phis to try to reuse VariableAccessDatas as much as possible.
ASSERT(m_graph[valueInPredecessor].variableAccessData() == m_graph[m_graph[valueInPredecessor].child1().index()].variableAccessData());
valueInPredecessor = m_graph[valueInPredecessor].child1().index();
} else {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Found @%u.\n", valueInPredecessor);
#endif
}
ASSERT(m_graph[valueInPredecessor].op() == SetLocal
|| m_graph[valueInPredecessor].op() == Phi
|| m_graph[valueInPredecessor].op() == Flush
|| (m_graph[valueInPredecessor].op() == SetArgument
&& stackType == ArgumentPhiStack));
VariableAccessData* dataForPredecessor = m_graph[valueInPredecessor].variableAccessData();
dataForPredecessor->unify(dataForPhi);
Node* phiNode = &m_graph[entry.m_phi];
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Ref count of @%u = %u.\n", entry.m_phi, phiNode->refCount());
#endif
if (phiNode->refCount()) {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Reffing @%u.\n", valueInPredecessor);
#endif
m_graph.ref(valueInPredecessor);
}
if (!phiNode->child1()) {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Setting @%u->child1 = @%u.\n", entry.m_phi, valueInPredecessor);
#endif
phiNode->children.setChild1(Edge(valueInPredecessor));
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Children of @%u: ", entry.m_phi);
phiNode->dumpChildren(WTF::dataFile());
dataLogF(".\n");
#endif
continue;
}
if (!phiNode->child2()) {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Setting @%u->child2 = @%u.\n", entry.m_phi, valueInPredecessor);
#endif
phiNode->children.setChild2(Edge(valueInPredecessor));
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Children of @%u: ", entry.m_phi);
phiNode->dumpChildren(WTF::dataFile());
dataLogF(".\n");
#endif
continue;
}
if (!phiNode->child3()) {
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Setting @%u->child3 = @%u.\n", entry.m_phi, valueInPredecessor);
#endif
phiNode->children.setChild3(Edge(valueInPredecessor));
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Children of @%u: ", entry.m_phi);
phiNode->dumpChildren(WTF::dataFile());
dataLogF(".\n");
#endif
continue;
}
NodeIndex newPhi = insertPhiNode(OpInfo(dataForPhi), entry.m_block);
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Splitting @%u, created @%u.\n", entry.m_phi, newPhi);
#endif
phiNode = &m_graph[entry.m_phi]; // reload after vector resize
Node& newPhiNode = m_graph[newPhi];
if (phiNode->refCount())
m_graph.ref(newPhi);
newPhiNode.children = phiNode->children;
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Children of @%u: ", newPhi);
newPhiNode.dumpChildren(WTF::dataFile());
dataLogF(".\n");
#endif
phiNode->children.initialize(newPhi, valueInPredecessor, NoNode);
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF(" Children of @%u: ", entry.m_phi);
phiNode->dumpChildren(WTF::dataFile());
dataLogF(".\n");
#endif
}
}
}
void ByteCodeParser::fixVariableAccessPredictions()
{
for (unsigned i = 0; i < m_graph.m_variableAccessData.size(); ++i) {
VariableAccessData* data = &m_graph.m_variableAccessData[i];
data->find()->predict(data->nonUnifiedPrediction());
data->find()->mergeIsCaptured(data->isCaptured());
data->find()->mergeStructureCheckHoistingFailed(data->structureCheckHoistingFailed());
}
}
void ByteCodeParser::linkBlock(BasicBlock* block, Vector<BlockIndex>& possibleTargets)
{
ASSERT(!block->isLinked);
ASSERT(!block->isEmpty());
Node& node = m_graph[block->last()];
ASSERT(node.isTerminal());
switch (node.op()) {
case Jump:
node.setTakenBlockIndex(m_graph.blockIndexForBytecodeOffset(possibleTargets, node.takenBytecodeOffsetDuringParsing()));
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Linked basic block %p to %p, #%u.\n", block, m_graph.m_blocks[node.takenBlockIndex()].get(), node.takenBlockIndex());
#endif
break;
case Branch:
node.setTakenBlockIndex(m_graph.blockIndexForBytecodeOffset(possibleTargets, node.takenBytecodeOffsetDuringParsing()));
node.setNotTakenBlockIndex(m_graph.blockIndexForBytecodeOffset(possibleTargets, node.notTakenBytecodeOffsetDuringParsing()));
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Linked basic block %p to %p, #%u and %p, #%u.\n", block, m_graph.m_blocks[node.takenBlockIndex()].get(), node.takenBlockIndex(), m_graph.m_blocks[node.notTakenBlockIndex()].get(), node.notTakenBlockIndex());
#endif
break;
default:
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Marking basic block %p as linked.\n", block);
#endif
break;
}
#if !ASSERT_DISABLED
block->isLinked = true;
#endif
}
void ByteCodeParser::linkBlocks(Vector<UnlinkedBlock>& unlinkedBlocks, Vector<BlockIndex>& possibleTargets)
{
for (size_t i = 0; i < unlinkedBlocks.size(); ++i) {
if (unlinkedBlocks[i].m_needsNormalLinking) {
linkBlock(m_graph.m_blocks[unlinkedBlocks[i].m_blockIndex].get(), possibleTargets);
unlinkedBlocks[i].m_needsNormalLinking = false;
}
}
}
void ByteCodeParser::buildOperandMapsIfNecessary()
{
if (m_haveBuiltOperandMaps)
return;
for (size_t i = 0; i < m_codeBlock->numberOfIdentifiers(); ++i)
m_identifierMap.add(m_codeBlock->identifier(i).impl(), i);
for (size_t i = 0; i < m_codeBlock->numberOfConstantRegisters(); ++i) {
JSValue value = m_codeBlock->getConstant(i + FirstConstantRegisterIndex);
if (!value)
m_emptyJSValueIndex = i + FirstConstantRegisterIndex;
else
m_jsValueMap.add(JSValue::encode(value), i + FirstConstantRegisterIndex);
}
m_haveBuiltOperandMaps = true;
}
ByteCodeParser::InlineStackEntry::InlineStackEntry(
ByteCodeParser* byteCodeParser,
CodeBlock* codeBlock,
CodeBlock* profiledBlock,
BlockIndex callsiteBlockHead,
VirtualRegister calleeVR,
JSFunction* callee,
VirtualRegister returnValueVR,
VirtualRegister inlineCallFrameStart,
int argumentCountIncludingThis,
CodeSpecializationKind kind)
: m_byteCodeParser(byteCodeParser)
, m_codeBlock(codeBlock)
, m_profiledBlock(profiledBlock)
, m_calleeVR(calleeVR)
, m_exitProfile(profiledBlock->exitProfile())
, m_callsiteBlockHead(callsiteBlockHead)
, m_returnValue(returnValueVR)
, m_lazyOperands(profiledBlock->lazyOperandValueProfiles())
, m_didReturn(false)
, m_didEarlyReturn(false)
, m_caller(byteCodeParser->m_inlineStackTop)
{
m_argumentPositions.resize(argumentCountIncludingThis);
for (int i = 0; i < argumentCountIncludingThis; ++i) {
byteCodeParser->m_graph.m_argumentPositions.append(ArgumentPosition());
ArgumentPosition* argumentPosition = &byteCodeParser->m_graph.m_argumentPositions.last();
m_argumentPositions[i] = argumentPosition;
}
// Track the code-block-global exit sites.
if (m_exitProfile.hasExitSite(ArgumentsEscaped)) {
byteCodeParser->m_graph.m_executablesWhoseArgumentsEscaped.add(
codeBlock->ownerExecutable());
}
if (m_caller) {
// Inline case.
ASSERT(codeBlock != byteCodeParser->m_codeBlock);
ASSERT(callee);
ASSERT(calleeVR != InvalidVirtualRegister);
ASSERT(inlineCallFrameStart != InvalidVirtualRegister);
ASSERT(callsiteBlockHead != NoBlock);
InlineCallFrame inlineCallFrame;
inlineCallFrame.executable.set(*byteCodeParser->m_globalData, byteCodeParser->m_codeBlock->ownerExecutable(), codeBlock->ownerExecutable());
inlineCallFrame.stackOffset = inlineCallFrameStart + JSStack::CallFrameHeaderSize;
inlineCallFrame.callee.set(*byteCodeParser->m_globalData, byteCodeParser->m_codeBlock->ownerExecutable(), callee);
inlineCallFrame.caller = byteCodeParser->currentCodeOrigin();
inlineCallFrame.arguments.resize(argumentCountIncludingThis); // Set the number of arguments including this, but don't configure the value recoveries, yet.
inlineCallFrame.isCall = isCall(kind);
if (inlineCallFrame.caller.inlineCallFrame)
inlineCallFrame.capturedVars = inlineCallFrame.caller.inlineCallFrame->capturedVars;
else {
for (int i = byteCodeParser->m_codeBlock->m_numVars; i--;) {
if (byteCodeParser->m_codeBlock->isCaptured(i))
inlineCallFrame.capturedVars.set(i);
}
}
for (int i = argumentCountIncludingThis; i--;) {
if (codeBlock->isCaptured(argumentToOperand(i)))
inlineCallFrame.capturedVars.set(argumentToOperand(i) + inlineCallFrame.stackOffset);
}
for (size_t i = codeBlock->m_numVars; i--;) {
if (codeBlock->isCaptured(i))
inlineCallFrame.capturedVars.set(i + inlineCallFrame.stackOffset);
}
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Current captured variables: ");
inlineCallFrame.capturedVars.dump(WTF::dataFile());
dataLogF("\n");
#endif
byteCodeParser->m_codeBlock->inlineCallFrames().append(inlineCallFrame);
m_inlineCallFrame = &byteCodeParser->m_codeBlock->inlineCallFrames().last();
byteCodeParser->buildOperandMapsIfNecessary();
m_identifierRemap.resize(codeBlock->numberOfIdentifiers());
m_constantRemap.resize(codeBlock->numberOfConstantRegisters());
m_constantBufferRemap.resize(codeBlock->numberOfConstantBuffers());
m_resolveOperationRemap.resize(codeBlock->numberOfResolveOperations());
m_putToBaseOperationRemap.resize(codeBlock->numberOfPutToBaseOperations());
for (size_t i = 0; i < codeBlock->numberOfIdentifiers(); ++i) {
StringImpl* rep = codeBlock->identifier(i).impl();
IdentifierMap::AddResult result = byteCodeParser->m_identifierMap.add(rep, byteCodeParser->m_codeBlock->numberOfIdentifiers());
if (result.isNewEntry)
byteCodeParser->m_codeBlock->addIdentifier(Identifier(byteCodeParser->m_globalData, rep));
m_identifierRemap[i] = result.iterator->value;
}
for (size_t i = 0; i < codeBlock->numberOfConstantRegisters(); ++i) {
JSValue value = codeBlock->getConstant(i + FirstConstantRegisterIndex);
if (!value) {
if (byteCodeParser->m_emptyJSValueIndex == UINT_MAX) {
byteCodeParser->m_emptyJSValueIndex = byteCodeParser->m_codeBlock->numberOfConstantRegisters() + FirstConstantRegisterIndex;
byteCodeParser->m_codeBlock->addConstant(JSValue());
byteCodeParser->m_constants.append(ConstantRecord());
}
m_constantRemap[i] = byteCodeParser->m_emptyJSValueIndex;
continue;
}
JSValueMap::AddResult result = byteCodeParser->m_jsValueMap.add(JSValue::encode(value), byteCodeParser->m_codeBlock->numberOfConstantRegisters() + FirstConstantRegisterIndex);
if (result.isNewEntry) {
byteCodeParser->m_codeBlock->addConstant(value);
byteCodeParser->m_constants.append(ConstantRecord());
}
m_constantRemap[i] = result.iterator->value;
}
for (size_t i = 0; i < codeBlock->numberOfResolveOperations(); i++) {
uint32_t newResolve = byteCodeParser->m_codeBlock->addResolve();
m_resolveOperationRemap[i] = newResolve;
byteCodeParser->m_codeBlock->resolveOperations(newResolve)->append(*codeBlock->resolveOperations(i));
}
for (unsigned i = 0; i < codeBlock->numberOfConstantBuffers(); ++i) {
// If we inline the same code block multiple times, we don't want to needlessly
// duplicate its constant buffers.
HashMap<ConstantBufferKey, unsigned>::iterator iter =
byteCodeParser->m_constantBufferCache.find(ConstantBufferKey(codeBlock, i));
if (iter != byteCodeParser->m_constantBufferCache.end()) {
m_constantBufferRemap[i] = iter->value;
continue;
}
Vector<JSValue>& buffer = codeBlock->constantBufferAsVector(i);
unsigned newIndex = byteCodeParser->m_codeBlock->addConstantBuffer(buffer);
m_constantBufferRemap[i] = newIndex;
byteCodeParser->m_constantBufferCache.add(ConstantBufferKey(codeBlock, i), newIndex);
}
for (size_t i = 0; i < codeBlock->numberOfPutToBaseOperations(); i++) {
uint32_t putToBaseResolve = byteCodeParser->m_codeBlock->addPutToBase();
m_putToBaseOperationRemap[i] = putToBaseResolve;
*byteCodeParser->m_codeBlock->putToBaseOperation(putToBaseResolve) = *codeBlock->putToBaseOperation(i);
}
m_callsiteBlockHeadNeedsLinking = true;
} else {
// Machine code block case.
ASSERT(codeBlock == byteCodeParser->m_codeBlock);
ASSERT(!callee);
ASSERT(calleeVR == InvalidVirtualRegister);
ASSERT(returnValueVR == InvalidVirtualRegister);
ASSERT(inlineCallFrameStart == InvalidVirtualRegister);
ASSERT(callsiteBlockHead == NoBlock);
m_inlineCallFrame = 0;
m_identifierRemap.resize(codeBlock->numberOfIdentifiers());
m_constantRemap.resize(codeBlock->numberOfConstantRegisters());
m_constantBufferRemap.resize(codeBlock->numberOfConstantBuffers());
m_resolveOperationRemap.resize(codeBlock->numberOfResolveOperations());
m_putToBaseOperationRemap.resize(codeBlock->numberOfPutToBaseOperations());
for (size_t i = 0; i < codeBlock->numberOfIdentifiers(); ++i)
m_identifierRemap[i] = i;
for (size_t i = 0; i < codeBlock->numberOfConstantRegisters(); ++i)
m_constantRemap[i] = i + FirstConstantRegisterIndex;
for (size_t i = 0; i < codeBlock->numberOfConstantBuffers(); ++i)
m_constantBufferRemap[i] = i;
for (size_t i = 0; i < codeBlock->numberOfResolveOperations(); ++i)
m_resolveOperationRemap[i] = i;
for (size_t i = 0; i < codeBlock->numberOfPutToBaseOperations(); ++i)
m_putToBaseOperationRemap[i] = i;
m_callsiteBlockHeadNeedsLinking = false;
}
for (size_t i = 0; i < m_constantRemap.size(); ++i)
ASSERT(m_constantRemap[i] >= static_cast<unsigned>(FirstConstantRegisterIndex));
byteCodeParser->m_inlineStackTop = this;
}
void ByteCodeParser::parseCodeBlock()
{
CodeBlock* codeBlock = m_inlineStackTop->m_codeBlock;
if (m_graph.m_compilation) {
m_graph.m_compilation->addProfiledBytecodes(
*m_globalData->m_perBytecodeProfiler, m_inlineStackTop->m_profiledBlock);
}
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog(
"Parsing ", *codeBlock,
": captureCount = ", codeBlock->symbolTable() ? codeBlock->symbolTable()->captureCount() : 0,
", needsFullScopeChain = ", codeBlock->needsFullScopeChain(),
", needsActivation = ", codeBlock->ownerExecutable()->needsActivation(),
", isStrictMode = ", codeBlock->ownerExecutable()->isStrictMode(), "\n");
codeBlock->baselineVersion()->dumpBytecode();
#endif
for (unsigned jumpTargetIndex = 0; jumpTargetIndex <= codeBlock->numberOfJumpTargets(); ++jumpTargetIndex) {
// The maximum bytecode offset to go into the current basicblock is either the next jump target, or the end of the instructions.
unsigned limit = jumpTargetIndex < codeBlock->numberOfJumpTargets() ? codeBlock->jumpTarget(jumpTargetIndex) : codeBlock->instructions().size();
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog(
"Parsing bytecode with limit ", pointerDump(m_inlineStackTop->m_inlineCallFrame),
" bc#", limit, " at inline depth ",
CodeOrigin::inlineDepthForCallFrame(m_inlineStackTop->m_inlineCallFrame), ".\n");
#endif
ASSERT(m_currentIndex < limit);
// Loop until we reach the current limit (i.e. next jump target).
do {
if (!m_currentBlock) {
// Check if we can use the last block.
if (!m_graph.m_blocks.isEmpty() && m_graph.m_blocks.last()->isEmpty()) {
// This must be a block belonging to us.
ASSERT(m_inlineStackTop->m_unlinkedBlocks.last().m_blockIndex == m_graph.m_blocks.size() - 1);
// Either the block is linkable or it isn't. If it's linkable then it's the last
// block in the blockLinkingTargets list. If it's not then the last block will
// have a lower bytecode index that the one we're about to give to this block.
if (m_inlineStackTop->m_blockLinkingTargets.isEmpty() || m_graph.m_blocks[m_inlineStackTop->m_blockLinkingTargets.last()]->bytecodeBegin != m_currentIndex) {
// Make the block linkable.
ASSERT(m_inlineStackTop->m_blockLinkingTargets.isEmpty() || m_graph.m_blocks[m_inlineStackTop->m_blockLinkingTargets.last()]->bytecodeBegin < m_currentIndex);
m_inlineStackTop->m_blockLinkingTargets.append(m_graph.m_blocks.size() - 1);
}
// Change its bytecode begin and continue.
m_currentBlock = m_graph.m_blocks.last().get();
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Reascribing bytecode index of block %p from bc#%u to bc#%u (peephole case).\n", m_currentBlock, m_currentBlock->bytecodeBegin, m_currentIndex);
#endif
m_currentBlock->bytecodeBegin = m_currentIndex;
} else {
OwnPtr<BasicBlock> block = adoptPtr(new BasicBlock(m_currentIndex, m_numArguments, m_numLocals));
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Creating basic block %p, #%zu for %p bc#%u at inline depth %u.\n", block.get(), m_graph.m_blocks.size(), m_inlineStackTop->executable(), m_currentIndex, CodeOrigin::inlineDepthForCallFrame(m_inlineStackTop->m_inlineCallFrame));
#endif
m_currentBlock = block.get();
// This assertion checks two things:
// 1) If the bytecodeBegin is greater than currentIndex, then something has gone
// horribly wrong. So, we're probably generating incorrect code.
// 2) If the bytecodeBegin is equal to the currentIndex, then we failed to do
// a peephole coalescing of this block in the if statement above. So, we're
// generating suboptimal code and leaving more work for the CFG simplifier.
ASSERT(m_inlineStackTop->m_unlinkedBlocks.isEmpty() || m_graph.m_blocks[m_inlineStackTop->m_unlinkedBlocks.last().m_blockIndex]->bytecodeBegin < m_currentIndex);
m_inlineStackTop->m_unlinkedBlocks.append(UnlinkedBlock(m_graph.m_blocks.size()));
m_inlineStackTop->m_blockLinkingTargets.append(m_graph.m_blocks.size());
// The first block is definitely an OSR target.
if (!m_graph.m_blocks.size())
block->isOSRTarget = true;
m_graph.m_blocks.append(block.release());
prepareToParseBlock();
}
}
bool shouldContinueParsing = parseBlock(limit);
// We should not have gone beyond the limit.
ASSERT(m_currentIndex <= limit);
// We should have planted a terminal, or we just gave up because
// we realized that the jump target information is imprecise, or we
// are at the end of an inline function, or we realized that we
// should stop parsing because there was a return in the first
// basic block.
ASSERT(m_currentBlock->isEmpty() || m_graph.last().isTerminal() || (m_currentIndex == codeBlock->instructions().size() && m_inlineStackTop->m_inlineCallFrame) || !shouldContinueParsing);
if (!shouldContinueParsing)
return;
m_currentBlock = 0;
} while (m_currentIndex < limit);
}
// Should have reached the end of the instructions.
ASSERT(m_currentIndex == codeBlock->instructions().size());
}
bool ByteCodeParser::parse()
{
// Set during construction.
ASSERT(!m_currentIndex);
#if DFG_ENABLE(ALL_VARIABLES_CAPTURED)
// We should be pretending that the code has an activation.
ASSERT(m_graph.needsActivation());
#endif
InlineStackEntry inlineStackEntry(
this, m_codeBlock, m_profiledBlock, NoBlock, InvalidVirtualRegister, 0,
InvalidVirtualRegister, InvalidVirtualRegister, m_codeBlock->numParameters(),
CodeForCall);
parseCodeBlock();
linkBlocks(inlineStackEntry.m_unlinkedBlocks, inlineStackEntry.m_blockLinkingTargets);
m_graph.determineReachability();
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF("Processing local variable phis.\n");
#endif
m_currentProfilingIndex = m_currentIndex;
processPhiStack<LocalPhiStack>();
#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
dataLogF("Processing argument phis.\n");
#endif
processPhiStack<ArgumentPhiStack>();
for (BlockIndex blockIndex = 0; blockIndex < m_graph.m_blocks.size(); ++blockIndex) {
BasicBlock* block = m_graph.m_blocks[blockIndex].get();
ASSERT(block);
if (!block->isReachable)
m_graph.m_blocks[blockIndex].clear();
}
fixVariableAccessPredictions();
for (BlockIndex blockIndex = 0; blockIndex < m_graph.m_blocks.size(); ++blockIndex) {
BasicBlock* block = m_graph.m_blocks[blockIndex].get();
if (!block)
continue;
if (!block->isOSRTarget)
continue;
if (block->bytecodeBegin != m_graph.m_osrEntryBytecodeIndex)
continue;
for (size_t i = 0; i < m_graph.m_mustHandleValues.size(); ++i) {
NodeIndex nodeIndex = block->variablesAtHead.operand(
m_graph.m_mustHandleValues.operandForIndex(i));
if (nodeIndex == NoNode)
continue;
Node& node = m_graph[nodeIndex];
ASSERT(node.hasLocal());
node.variableAccessData()->predict(
speculationFromValue(m_graph.m_mustHandleValues[i]));
}
}
m_graph.m_preservedVars = m_preservedVars;
m_graph.m_localVars = m_numLocals;
m_graph.m_parameterSlots = m_parameterSlots;
return true;
}
bool parse(ExecState* exec, Graph& graph)
{
SamplingRegion samplingRegion("DFG Parsing");
#if DFG_DEBUG_LOCAL_DISBALE
UNUSED_PARAM(exec);
UNUSED_PARAM(graph);
return false;
#else
return ByteCodeParser(exec, graph).parse();
#endif
}
} } // namespace JSC::DFG
#endif