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DFGGraph.cpp
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775 lines (693 loc) · 27.9 KB
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/*
* Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DFGGraph.h"
#include "BytecodeLivenessAnalysisInlines.h"
#include "CodeBlock.h"
#include "CodeBlockWithJITType.h"
#include "DFGClobberSet.h"
#include "DFGJITCode.h"
#include "DFGVariableAccessDataDump.h"
#include "FullBytecodeLiveness.h"
#include "FunctionExecutableDump.h"
#include "JIT.h"
#include "JSActivation.h"
#include "OperandsInlines.h"
#include "Operations.h"
#include <wtf/CommaPrinter.h>
#include <wtf/ListDump.h>
#if ENABLE(DFG_JIT)
namespace JSC { namespace DFG {
// Creates an array of stringized names.
static const char* dfgOpNames[] = {
#define STRINGIZE_DFG_OP_ENUM(opcode, flags) #opcode ,
FOR_EACH_DFG_OP(STRINGIZE_DFG_OP_ENUM)
#undef STRINGIZE_DFG_OP_ENUM
};
Graph::Graph(VM& vm, Plan& plan, LongLivedState& longLivedState)
: m_vm(vm)
, m_plan(plan)
, m_codeBlock(m_plan.codeBlock.get())
, m_profiledBlock(m_codeBlock->alternative())
, m_allocator(longLivedState.m_allocator)
, m_mustHandleAbstractValues(OperandsLike, plan.mustHandleValues)
, m_inlineCallFrames(adoptPtr(new InlineCallFrameSet()))
, m_hasArguments(false)
, m_nextMachineLocal(0)
, m_machineCaptureStart(std::numeric_limits<int>::max())
, m_fixpointState(BeforeFixpoint)
, m_form(LoadStore)
, m_unificationState(LocallyUnified)
, m_refCountState(EverythingIsLive)
{
ASSERT(m_profiledBlock);
for (unsigned i = m_mustHandleAbstractValues.size(); i--;)
m_mustHandleAbstractValues[i].setMostSpecific(*this, plan.mustHandleValues[i]);
}
Graph::~Graph()
{
m_allocator.freeAll();
}
const char *Graph::opName(NodeType op)
{
return dfgOpNames[op];
}
static void printWhiteSpace(PrintStream& out, unsigned amount)
{
while (amount-- > 0)
out.print(" ");
}
bool Graph::dumpCodeOrigin(PrintStream& out, const char* prefix, Node* previousNode, Node* currentNode, DumpContext* context)
{
if (!previousNode)
return false;
if (previousNode->codeOrigin.inlineCallFrame == currentNode->codeOrigin.inlineCallFrame)
return false;
Vector<CodeOrigin> previousInlineStack = previousNode->codeOrigin.inlineStack();
Vector<CodeOrigin> currentInlineStack = currentNode->codeOrigin.inlineStack();
unsigned commonSize = std::min(previousInlineStack.size(), currentInlineStack.size());
unsigned indexOfDivergence = commonSize;
for (unsigned i = 0; i < commonSize; ++i) {
if (previousInlineStack[i].inlineCallFrame != currentInlineStack[i].inlineCallFrame) {
indexOfDivergence = i;
break;
}
}
bool hasPrinted = false;
// Print the pops.
for (unsigned i = previousInlineStack.size(); i-- > indexOfDivergence;) {
out.print(prefix);
printWhiteSpace(out, i * 2);
out.print("<-- ", inContext(*previousInlineStack[i].inlineCallFrame, context), "\n");
hasPrinted = true;
}
// Print the pushes.
for (unsigned i = indexOfDivergence; i < currentInlineStack.size(); ++i) {
out.print(prefix);
printWhiteSpace(out, i * 2);
out.print("--> ", inContext(*currentInlineStack[i].inlineCallFrame, context), "\n");
hasPrinted = true;
}
return hasPrinted;
}
int Graph::amountOfNodeWhiteSpace(Node* node)
{
return (node->codeOrigin.inlineDepth() - 1) * 2;
}
void Graph::printNodeWhiteSpace(PrintStream& out, Node* node)
{
printWhiteSpace(out, amountOfNodeWhiteSpace(node));
}
void Graph::dump(PrintStream& out, const char* prefix, Node* node, DumpContext* context)
{
NodeType op = node->op();
unsigned refCount = node->refCount();
bool skipped = !refCount;
bool mustGenerate = node->mustGenerate();
if (mustGenerate)
--refCount;
out.print(prefix);
printNodeWhiteSpace(out, node);
// Example/explanation of dataflow dump output
//
// 14: <!2:7> GetByVal(@3, @13)
// ^1 ^2 ^3 ^4 ^5
//
// (1) The nodeIndex of this operation.
// (2) The reference count. The number printed is the 'real' count,
// not including the 'mustGenerate' ref. If the node is
// 'mustGenerate' then the count it prefixed with '!'.
// (3) The virtual register slot assigned to this node.
// (4) The name of the operation.
// (5) The arguments to the operation. The may be of the form:
// @# - a NodeIndex referencing a prior node in the graph.
// arg# - an argument number.
// $# - the index in the CodeBlock of a constant { for numeric constants the value is displayed | for integers, in both decimal and hex }.
// id# - the index in the CodeBlock of an identifier { if codeBlock is passed to dump(), the string representation is displayed }.
// var# - the index of a var on the global object, used by GetGlobalVar/PutGlobalVar operations.
out.printf("% 4d:%s<%c%u:", (int)node->index(), skipped ? " skipped " : " ", mustGenerate ? '!' : ' ', refCount);
if (node->hasResult() && !skipped && node->hasVirtualRegister())
out.print(node->virtualRegister());
else
out.print("-");
out.print(">\t", opName(op), "(");
CommaPrinter comma;
if (node->flags() & NodeHasVarArgs) {
for (unsigned childIdx = node->firstChild(); childIdx < node->firstChild() + node->numChildren(); childIdx++) {
if (!m_varArgChildren[childIdx])
continue;
out.print(comma, m_varArgChildren[childIdx]);
}
} else {
if (!!node->child1() || !!node->child2() || !!node->child3())
out.print(comma, node->child1());
if (!!node->child2() || !!node->child3())
out.print(comma, node->child2());
if (!!node->child3())
out.print(comma, node->child3());
}
if (toCString(NodeFlagsDump(node->flags())) != "<empty>")
out.print(comma, NodeFlagsDump(node->flags()));
if (node->prediction())
out.print(comma, SpeculationDump(node->prediction()));
if (node->hasArrayMode())
out.print(comma, node->arrayMode());
if (node->hasVarNumber())
out.print(comma, node->varNumber());
if (node->hasRegisterPointer())
out.print(comma, "global", globalObjectFor(node->codeOrigin)->findRegisterIndex(node->registerPointer()), "(", RawPointer(node->registerPointer()), ")");
if (node->hasIdentifier())
out.print(comma, "id", node->identifierNumber(), "{", identifiers()[node->identifierNumber()], "}");
if (node->hasStructureSet())
out.print(comma, inContext(node->structureSet(), context));
if (node->hasStructure())
out.print(comma, inContext(*node->structure(), context));
if (node->hasStructureTransitionData())
out.print(comma, inContext(*node->structureTransitionData().previousStructure, context), " -> ", inContext(*node->structureTransitionData().newStructure, context));
if (node->hasFunction()) {
out.print(comma, "function(", RawPointer(node->function()), ", ");
if (node->function()->inherits(JSFunction::info())) {
JSFunction* function = jsCast<JSFunction*>(node->function());
if (function->isHostFunction())
out.print("<host function>");
else
out.print(FunctionExecutableDump(function->jsExecutable()));
} else
out.print("<not JSFunction>");
out.print(")");
}
if (node->hasExecutable()) {
if (node->executable()->inherits(FunctionExecutable::info()))
out.print(comma, "executable(", FunctionExecutableDump(jsCast<FunctionExecutable*>(node->executable())), ")");
else
out.print(comma, "executable(not function: ", RawPointer(node->executable()), ")");
}
if (node->hasFunctionDeclIndex()) {
FunctionExecutable* executable = m_codeBlock->functionDecl(node->functionDeclIndex());
out.print(comma, FunctionExecutableDump(executable));
}
if (node->hasFunctionExprIndex()) {
FunctionExecutable* executable = m_codeBlock->functionExpr(node->functionExprIndex());
out.print(comma, FunctionExecutableDump(executable));
}
if (node->hasStorageAccessData()) {
StorageAccessData& storageAccessData = m_storageAccessData[node->storageAccessDataIndex()];
out.print(comma, "id", storageAccessData.identifierNumber, "{", identifiers()[storageAccessData.identifierNumber], "}");
out.print(", ", static_cast<ptrdiff_t>(storageAccessData.offset));
}
ASSERT(node->hasVariableAccessData(*this) == node->hasLocal(*this));
if (node->hasVariableAccessData(*this)) {
VariableAccessData* variableAccessData = node->variableAccessData();
VirtualRegister operand = variableAccessData->local();
if (operand.isArgument())
out.print(comma, "arg", operand.toArgument(), "(", VariableAccessDataDump(*this, variableAccessData), ")");
else
out.print(comma, "loc", operand.toLocal(), "(", VariableAccessDataDump(*this, variableAccessData), ")");
operand = variableAccessData->machineLocal();
if (operand.isValid()) {
if (operand.isArgument())
out.print(comma, "machine:arg", operand.toArgument());
else
out.print(comma, "machine:loc", operand.toLocal());
}
}
if (node->hasUnlinkedLocal()) {
VirtualRegister operand = node->unlinkedLocal();
if (operand.isArgument())
out.print(comma, "arg", operand.toArgument());
else
out.print(comma, "loc", operand.toLocal());
}
if (node->hasUnlinkedMachineLocal()) {
VirtualRegister operand = node->unlinkedMachineLocal();
if (operand.isValid()) {
if (operand.isArgument())
out.print(comma, "machine:arg", operand.toArgument());
else
out.print(comma, "machine:loc", operand.toLocal());
}
}
if (node->hasConstantBuffer()) {
out.print(comma);
out.print(node->startConstant(), ":[");
CommaPrinter anotherComma;
for (unsigned i = 0; i < node->numConstants(); ++i)
out.print(anotherComma, inContext(m_codeBlock->constantBuffer(node->startConstant())[i], context));
out.print("]");
}
if (node->hasIndexingType())
out.print(comma, IndexingTypeDump(node->indexingType()));
if (node->hasTypedArrayType())
out.print(comma, node->typedArrayType());
if (node->hasPhi())
out.print(comma, "^", node->phi()->index());
if (node->hasExecutionCounter())
out.print(comma, RawPointer(node->executionCounter()));
if (node->hasVariableWatchpointSet())
out.print(comma, RawPointer(node->variableWatchpointSet()));
if (node->hasTypedArray())
out.print(comma, inContext(JSValue(node->typedArray()), context));
if (node->hasStoragePointer())
out.print(comma, RawPointer(node->storagePointer()));
if (op == JSConstant) {
out.print(comma, "$", node->constantNumber());
JSValue value = valueOfJSConstant(node);
out.print(" = ", inContext(value, context));
}
if (op == WeakJSConstant)
out.print(comma, RawPointer(node->weakConstant()), " (", inContext(*node->weakConstant()->structure(), context), ")");
if (node->isBranch() || node->isJump())
out.print(comma, "T:", *node->takenBlock());
if (node->isBranch())
out.print(comma, "F:", *node->notTakenBlock());
if (node->isSwitch()) {
SwitchData* data = node->switchData();
out.print(comma, data->kind);
for (unsigned i = 0; i < data->cases.size(); ++i)
out.print(comma, inContext(data->cases[i].value, context), ":", *data->cases[i].target);
out.print(comma, "default:", *data->fallThrough);
}
ClobberSet reads;
ClobberSet writes;
addReadsAndWrites(*this, node, reads, writes);
if (!reads.isEmpty())
out.print(comma, "R:", sortedListDump(reads.direct(), ","));
if (!writes.isEmpty())
out.print(comma, "W:", sortedListDump(writes.direct(), ","));
out.print(comma, "bc#", node->codeOrigin.bytecodeIndex);
out.print(")");
if (!skipped) {
if (node->hasVariableAccessData(*this))
out.print(" predicting ", SpeculationDump(node->variableAccessData()->prediction()));
else if (node->hasHeapPrediction())
out.print(" predicting ", SpeculationDump(node->getHeapPrediction()));
}
out.print("\n");
}
void Graph::dumpBlockHeader(PrintStream& out, const char* prefix, BasicBlock* block, PhiNodeDumpMode phiNodeDumpMode, DumpContext* context)
{
out.print(prefix, "Block ", *block, " (", inContext(block->at(0)->codeOrigin, context), "): ", block->isReachable ? "" : "(skipped)", block->isOSRTarget ? " (OSR target)" : "", "\n");
out.print(prefix, " Predecessors:");
for (size_t i = 0; i < block->predecessors.size(); ++i)
out.print(" ", *block->predecessors[i]);
out.print("\n");
if (m_dominators.isValid()) {
out.print(prefix, " Dominated by:");
for (size_t i = 0; i < m_blocks.size(); ++i) {
if (!m_dominators.dominates(i, block->index))
continue;
out.print(" #", i);
}
out.print("\n");
out.print(prefix, " Dominates:");
for (size_t i = 0; i < m_blocks.size(); ++i) {
if (!m_dominators.dominates(block->index, i))
continue;
out.print(" #", i);
}
out.print("\n");
}
if (m_naturalLoops.isValid()) {
if (const NaturalLoop* loop = m_naturalLoops.headerOf(block)) {
out.print(prefix, " Loop header, contains:");
Vector<BlockIndex> sortedBlockList;
for (unsigned i = 0; i < loop->size(); ++i)
sortedBlockList.append(loop->at(i)->index);
std::sort(sortedBlockList.begin(), sortedBlockList.end());
for (unsigned i = 0; i < sortedBlockList.size(); ++i)
out.print(" #", sortedBlockList[i]);
out.print("\n");
}
Vector<const NaturalLoop*> containingLoops =
m_naturalLoops.loopsOf(block);
if (!containingLoops.isEmpty()) {
out.print(prefix, " Containing loop headers:");
for (unsigned i = 0; i < containingLoops.size(); ++i)
out.print(" ", *containingLoops[i]->header());
out.print("\n");
}
}
if (!block->phis.isEmpty()) {
out.print(prefix, " Phi Nodes:");
for (size_t i = 0; i < block->phis.size(); ++i) {
Node* phiNode = block->phis[i];
if (!phiNode->shouldGenerate() && phiNodeDumpMode == DumpLivePhisOnly)
continue;
out.print(" @", phiNode->index(), "<", phiNode->refCount(), ">->(");
if (phiNode->child1()) {
out.print("@", phiNode->child1()->index());
if (phiNode->child2()) {
out.print(", @", phiNode->child2()->index());
if (phiNode->child3())
out.print(", @", phiNode->child3()->index());
}
}
out.print(")", i + 1 < block->phis.size() ? "," : "");
}
out.print("\n");
}
}
void Graph::dump(PrintStream& out, DumpContext* context)
{
DumpContext myContext;
myContext.graph = this;
if (!context)
context = &myContext;
dataLog("\n");
dataLog("DFG for ", CodeBlockWithJITType(m_codeBlock, JITCode::DFGJIT), ":\n");
dataLog(" Fixpoint state: ", m_fixpointState, "; Form: ", m_form, "; Unification state: ", m_unificationState, "; Ref count state: ", m_refCountState, "\n");
dataLog("\n");
Node* lastNode = 0;
for (size_t b = 0; b < m_blocks.size(); ++b) {
BasicBlock* block = m_blocks[b].get();
if (!block)
continue;
dumpBlockHeader(out, "", block, DumpAllPhis, context);
switch (m_form) {
case LoadStore:
case ThreadedCPS: {
out.print(" vars before: ");
if (block->cfaHasVisited)
out.print(inContext(block->valuesAtHead, context));
else
out.print("<empty>");
out.print("\n");
out.print(" var links: ", block->variablesAtHead, "\n");
break;
}
case SSA: {
RELEASE_ASSERT(block->ssa);
out.print(" Flush format: ", block->ssa->flushAtHead, "\n");
out.print(" Availability: ", block->ssa->availabilityAtHead, "\n");
out.print(" Live: ", nodeListDump(block->ssa->liveAtHead), "\n");
out.print(" Values: ", nodeMapDump(block->ssa->valuesAtHead, context), "\n");
break;
} }
for (size_t i = 0; i < block->size(); ++i) {
dumpCodeOrigin(out, "", lastNode, block->at(i), context);
dump(out, "", block->at(i), context);
lastNode = block->at(i);
}
switch (m_form) {
case LoadStore:
case ThreadedCPS: {
out.print(" vars after: ");
if (block->cfaHasVisited)
out.print(inContext(block->valuesAtTail, context));
else
out.print("<empty>");
out.print("\n");
out.print(" var links: ", block->variablesAtTail, "\n");
break;
}
case SSA: {
RELEASE_ASSERT(block->ssa);
out.print(" Flush format: ", block->ssa->flushAtTail, "\n");
out.print(" Availability: ", block->ssa->availabilityAtTail, "\n");
out.print(" Live: ", nodeListDump(block->ssa->liveAtTail), "\n");
out.print(" Values: ", nodeMapDump(block->ssa->valuesAtTail, context), "\n");
break;
} }
dataLog("\n");
}
if (!myContext.isEmpty()) {
myContext.dump(WTF::dataFile());
dataLog("\n");
}
}
void Graph::dethread()
{
if (m_form == LoadStore || m_form == SSA)
return;
if (logCompilationChanges())
dataLog("Dethreading DFG graph.\n");
SamplingRegion samplingRegion("DFG Dethreading");
for (BlockIndex blockIndex = m_blocks.size(); blockIndex--;) {
BasicBlock* block = m_blocks[blockIndex].get();
if (!block)
continue;
for (unsigned phiIndex = block->phis.size(); phiIndex--;) {
Node* phi = block->phis[phiIndex];
phi->children.reset();
}
}
m_form = LoadStore;
}
void Graph::handleSuccessor(Vector<BasicBlock*, 16>& worklist, BasicBlock* block, BasicBlock* successor)
{
if (!successor->isReachable) {
successor->isReachable = true;
worklist.append(successor);
}
successor->predecessors.append(block);
}
void Graph::determineReachability()
{
Vector<BasicBlock*, 16> worklist;
worklist.append(block(0));
block(0)->isReachable = true;
while (!worklist.isEmpty()) {
BasicBlock* block = worklist.takeLast();
for (unsigned i = block->numSuccessors(); i--;)
handleSuccessor(worklist, block, block->successor(i));
}
}
void Graph::resetReachability()
{
for (BlockIndex blockIndex = m_blocks.size(); blockIndex--;) {
BasicBlock* block = m_blocks[blockIndex].get();
if (!block)
continue;
block->isReachable = false;
block->predecessors.clear();
}
determineReachability();
}
void Graph::killBlockAndItsContents(BasicBlock* block)
{
for (unsigned phiIndex = block->phis.size(); phiIndex--;)
m_allocator.free(block->phis[phiIndex]);
for (unsigned nodeIndex = block->size(); nodeIndex--;)
m_allocator.free(block->at(nodeIndex));
killBlock(block);
}
void Graph::killUnreachableBlocks()
{
for (BlockIndex blockIndex = 0; blockIndex < numBlocks(); ++blockIndex) {
BasicBlock* block = this->block(blockIndex);
if (!block)
continue;
if (block->isReachable)
continue;
killBlockAndItsContents(block);
}
}
void Graph::resetExitStates()
{
for (BlockIndex blockIndex = 0; blockIndex < m_blocks.size(); ++blockIndex) {
BasicBlock* block = m_blocks[blockIndex].get();
if (!block)
continue;
for (unsigned indexInBlock = block->size(); indexInBlock--;)
block->at(indexInBlock)->setCanExit(true);
}
}
void Graph::invalidateCFG()
{
m_dominators.invalidate();
m_naturalLoops.invalidate();
}
void Graph::substituteGetLocal(BasicBlock& block, unsigned startIndexInBlock, VariableAccessData* variableAccessData, Node* newGetLocal)
{
if (variableAccessData->isCaptured()) {
// Let CSE worry about this one.
return;
}
for (unsigned indexInBlock = startIndexInBlock; indexInBlock < block.size(); ++indexInBlock) {
Node* node = block[indexInBlock];
bool shouldContinue = true;
switch (node->op()) {
case SetLocal: {
if (node->local() == variableAccessData->local())
shouldContinue = false;
break;
}
case GetLocal: {
if (node->variableAccessData() != variableAccessData)
continue;
substitute(block, indexInBlock, node, newGetLocal);
Node* oldTailNode = block.variablesAtTail.operand(variableAccessData->local());
if (oldTailNode == node)
block.variablesAtTail.operand(variableAccessData->local()) = newGetLocal;
shouldContinue = false;
break;
}
default:
break;
}
if (!shouldContinue)
break;
}
}
void Graph::addForDepthFirstSort(Vector<BasicBlock*>& result, Vector<BasicBlock*, 16>& worklist, HashSet<BasicBlock*>& seen, BasicBlock* block)
{
if (seen.contains(block))
return;
result.append(block);
worklist.append(block);
seen.add(block);
}
void Graph::getBlocksInDepthFirstOrder(Vector<BasicBlock*>& result)
{
Vector<BasicBlock*, 16> worklist;
HashSet<BasicBlock*> seen;
addForDepthFirstSort(result, worklist, seen, block(0));
while (!worklist.isEmpty()) {
BasicBlock* block = worklist.takeLast();
for (unsigned i = block->numSuccessors(); i--;)
addForDepthFirstSort(result, worklist, seen, block->successor(i));
}
}
void Graph::clearReplacements()
{
for (BlockIndex blockIndex = numBlocks(); blockIndex--;) {
BasicBlock* block = m_blocks[blockIndex].get();
if (!block)
continue;
for (unsigned phiIndex = block->phis.size(); phiIndex--;)
block->phis[phiIndex]->misc.replacement = 0;
for (unsigned nodeIndex = block->size(); nodeIndex--;)
block->at(nodeIndex)->misc.replacement = 0;
}
}
void Graph::initializeNodeOwners()
{
for (BlockIndex blockIndex = numBlocks(); blockIndex--;) {
BasicBlock* block = m_blocks[blockIndex].get();
if (!block)
continue;
for (unsigned phiIndex = block->phis.size(); phiIndex--;)
block->phis[phiIndex]->misc.owner = block;
for (unsigned nodeIndex = block->size(); nodeIndex--;)
block->at(nodeIndex)->misc.owner = block;
}
}
FullBytecodeLiveness& Graph::livenessFor(CodeBlock* codeBlock)
{
HashMap<CodeBlock*, std::unique_ptr<FullBytecodeLiveness>>::iterator iter = m_bytecodeLiveness.find(codeBlock);
if (iter != m_bytecodeLiveness.end())
return *iter->value;
std::unique_ptr<FullBytecodeLiveness> liveness = std::make_unique<FullBytecodeLiveness>();
codeBlock->livenessAnalysis().computeFullLiveness(*liveness);
FullBytecodeLiveness& result = *liveness;
m_bytecodeLiveness.add(codeBlock, std::move(liveness));
return result;
}
FullBytecodeLiveness& Graph::livenessFor(InlineCallFrame* inlineCallFrame)
{
return livenessFor(baselineCodeBlockFor(inlineCallFrame));
}
bool Graph::isLiveInBytecode(VirtualRegister operand, CodeOrigin codeOrigin)
{
for (;;) {
if (operand.offset() < codeOrigin.stackOffset() + JSStack::CallFrameHeaderSize) {
VirtualRegister reg = VirtualRegister(
operand.offset() - codeOrigin.stackOffset());
if (reg.isArgument()) {
RELEASE_ASSERT(reg.offset() < JSStack::CallFrameHeaderSize);
if (!codeOrigin.inlineCallFrame->isClosureCall)
return false;
if (reg.offset() == JSStack::Callee)
return true;
if (reg.offset() == JSStack::ScopeChain)
return true;
return false;
}
return livenessFor(codeOrigin.inlineCallFrame).operandIsLive(
reg.offset(), codeOrigin.bytecodeIndex);
}
if (!codeOrigin.inlineCallFrame)
break;
codeOrigin = codeOrigin.inlineCallFrame->caller;
}
return true;
}
unsigned Graph::frameRegisterCount()
{
return m_nextMachineLocal + m_parameterSlots;
}
unsigned Graph::requiredRegisterCountForExit()
{
unsigned count = JIT::frameRegisterCountFor(m_profiledBlock);
for (InlineCallFrameSet::iterator iter = m_inlineCallFrames->begin(); !!iter; ++iter) {
InlineCallFrame* inlineCallFrame = *iter;
CodeBlock* codeBlock = baselineCodeBlockForInlineCallFrame(inlineCallFrame);
unsigned requiredCount = VirtualRegister(inlineCallFrame->stackOffset).toLocal() + 1 + JIT::frameRegisterCountFor(codeBlock);
count = std::max(count, requiredCount);
}
return count;
}
unsigned Graph::requiredRegisterCountForExecutionAndExit()
{
return std::max(frameRegisterCount(), requiredRegisterCountForExit());
}
JSActivation* Graph::tryGetActivation(Node* node)
{
if (!node->hasConstant())
return 0;
return jsDynamicCast<JSActivation*>(valueOfJSConstant(node));
}
WriteBarrierBase<Unknown>* Graph::tryGetRegisters(Node* node)
{
JSActivation* activation = tryGetActivation(node);
if (!activation)
return 0;
if (!activation->isTornOff())
return 0;
return activation->registers();
}
JSArrayBufferView* Graph::tryGetFoldableView(Node* node)
{
if (!node->hasConstant())
return 0;
JSArrayBufferView* view = jsDynamicCast<JSArrayBufferView*>(valueOfJSConstant(node));
if (!view)
return 0;
if (!watchpoints().isStillValid(view))
return 0;
return view;
}
JSArrayBufferView* Graph::tryGetFoldableView(Node* node, ArrayMode arrayMode)
{
if (arrayMode.typedArrayType() == NotTypedArray)
return 0;
return tryGetFoldableView(node);
}
JSArrayBufferView* Graph::tryGetFoldableViewForChild1(Node* node)
{
return tryGetFoldableView(child(node, 0).node(), node->arrayMode());
}
} } // namespace JSC::DFG
#endif