Plan::CompilationPath Plan::compileInThreadImpl(LongLivedState& longLivedState)
{
if (verboseCompilationEnabled() && osrEntryBytecodeIndex != UINT_MAX) {
dataLog("\n");
dataLog("Compiler must handle OSR entry from bc#", osrEntryBytecodeIndex, " with values: ", mustHandleValues, "\n");
dataLog("\n");
}
Graph dfg(vm, *this, longLivedState);
if (!parse(dfg)) {
finalizer = adoptPtr(new FailedFinalizer(*this));
return FailPath;
}
// By this point the DFG bytecode parser will have potentially mutated various tables
// in the CodeBlock. This is a good time to perform an early shrink, which is more
// powerful than a late one. It's safe to do so because we haven't generated any code
// that references any of the tables directly, yet.
codeBlock->shrinkToFit(CodeBlock::EarlyShrink);
if (validationEnabled())
validate(dfg);
performCPSRethreading(dfg);
performUnification(dfg);
performPredictionInjection(dfg);
if (mode == FTLForOSREntryMode) {
bool result = performOSREntrypointCreation(dfg);
if (!result) {
finalizer = adoptPtr(new FailedFinalizer(*this));
return FailPath;
}
performCPSRethreading(dfg);
}
if (validationEnabled())
validate(dfg);
performBackwardsPropagation(dfg);
performPredictionPropagation(dfg);
performFixup(dfg);
performTypeCheckHoisting(dfg);
unsigned count = 1;
dfg.m_fixpointState = FixpointNotConverged;
for (;; ++count) {
if (logCompilationChanges())
dataLogF("DFG beginning optimization fixpoint iteration #%u.\n", count);
bool changed = false;
if (validationEnabled())
validate(dfg);
performCFA(dfg);
changed |= performConstantFolding(dfg);
changed |= performArgumentsSimplification(dfg);
changed |= performCFGSimplification(dfg);
changed |= performCSE(dfg);
if (!changed)
break;
performCPSRethreading(dfg);
}
if (logCompilationChanges())
dataLogF("DFG optimization fixpoint converged in %u iterations.\n", count);
dfg.m_fixpointState = FixpointConverged;
performStoreElimination(dfg);
// If we're doing validation, then run some analyses, to give them an opportunity
// to self-validate. Now is as good a time as any to do this.
if (validationEnabled()) {
dfg.m_dominators.computeIfNecessary(dfg);
dfg.m_naturalLoops.computeIfNecessary(dfg);
}
switch (mode) {
case DFGMode: {
performTierUpCheckInjection(dfg);
break;
}
case FTLMode:
case FTLForOSREntryMode: {
#if ENABLE(FTL_JIT)
if (FTL::canCompile(dfg) == FTL::CannotCompile) {
finalizer = adoptPtr(new FailedFinalizer(*this));
return FailPath;
}
performCriticalEdgeBreaking(dfg);
performLoopPreHeaderCreation(dfg);
performCPSRethreading(dfg);
performSSAConversion(dfg);
performLivenessAnalysis(dfg);
performCFA(dfg);
performLICM(dfg);
performLivenessAnalysis(dfg);
performCFA(dfg);
performDCE(dfg); // We rely on this to convert dead SetLocals into the appropriate hint, and to kill dead code that won't be recognized as dead by LLVM.
performStackLayout(dfg);
performLivenessAnalysis(dfg);
performFlushLivenessAnalysis(dfg);
performOSRAvailabilityAnalysis(dfg);
dumpAndVerifyGraph(dfg, "Graph just before FTL lowering:");
initializeLLVM();
FTL::State state(dfg);
FTL::lowerDFGToLLVM(state);
if (Options::reportCompileTimes())
beforeFTL = currentTimeMS();
if (Options::llvmAlwaysFailsBeforeCompile()) {
FTL::fail(state);
return FTLPath;
}
FTL::compile(state);
if (Options::llvmAlwaysFailsBeforeLink()) {
FTL::fail(state);
return FTLPath;
}
FTL::link(state);
return FTLPath;
#else
RELEASE_ASSERT_NOT_REACHED();
break;
#endif // ENABLE(FTL_JIT)
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
performCPSRethreading(dfg);
performDCE(dfg);
performStackLayout(dfg);
performVirtualRegisterAllocation(dfg);
dumpAndVerifyGraph(dfg, "Graph after optimization:");
JITCompiler dataFlowJIT(dfg);
if (codeBlock->codeType() == FunctionCode) {
dataFlowJIT.compileFunction();
dataFlowJIT.linkFunction();
} else {
dataFlowJIT.compile();
dataFlowJIT.link();
}
return DFGPath;
}
inline bool compile(CompileMode compileMode, ExecState* exec, CodeBlock* codeBlock, JITCode& jitCode, MacroAssemblerCodePtr* jitCodeWithArityCheck)
{
SamplingRegion samplingRegion("DFG Compilation (Driver)");
ASSERT(codeBlock);
ASSERT(codeBlock->alternative());
ASSERT(codeBlock->alternative()->getJITType() == JITCode::BaselineJIT);
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("DFG compiling code block %p(%p) for executable %p, number of instructions = %u.\n", codeBlock, codeBlock->alternative(), codeBlock->ownerExecutable(), codeBlock->instructionCount());
#endif
Graph dfg(exec->globalData(), codeBlock);
if (!parse(exec, dfg))
return false;
if (compileMode == CompileFunction)
dfg.predictArgumentTypes();
// By this point the DFG bytecode parser will have potentially mutated various tables
// in the CodeBlock. This is a good time to perform an early shrink, which is more
// powerful than a late one. It's safe to do so because we haven't generated any code
// that references any of the tables directly, yet.
codeBlock->shrinkToFit(CodeBlock::EarlyShrink);
validate(dfg);
performPredictionPropagation(dfg);
performFixup(dfg);
unsigned cnt = 1;
for (;; ++cnt) {
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("DFG beginning optimization fixpoint iteration #%u.\n", cnt);
#endif
bool changed = false;
performCFA(dfg);
changed |= performConstantFolding(dfg);
changed |= performArgumentsSimplification(dfg);
changed |= performCFGSimplification(dfg);
changed |= performCSE(dfg, FixpointNotConverged);
if (!changed)
break;
dfg.resetExitStates();
performFixup(dfg);
}
performCSE(dfg, FixpointConverged);
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("DFG optimization fixpoint converged in %u iterations.\n", cnt);
#endif
performVirtualRegisterAllocation(dfg);
GraphDumpMode modeForFinalValidate = DumpGraph;
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLog("Graph after optimization:\n");
dfg.dump();
modeForFinalValidate = DontDumpGraph;
#endif
validate(dfg, modeForFinalValidate);
JITCompiler dataFlowJIT(dfg);
bool result;
if (compileMode == CompileFunction) {
ASSERT(jitCodeWithArityCheck);
result = dataFlowJIT.compileFunction(jitCode, *jitCodeWithArityCheck);
} else {
ASSERT(compileMode == CompileOther);
ASSERT(!jitCodeWithArityCheck);
result = dataFlowJIT.compile(jitCode);
}
return result;
}
inline bool compile(CompileMode compileMode, ExecState* exec, CodeBlock* codeBlock, JITCode& jitCode, MacroAssemblerCodePtr* jitCodeWithArityCheck, unsigned osrEntryBytecodeIndex)
{
SamplingRegion samplingRegion("DFG Compilation (Driver)");
numCompilations++;
ASSERT(codeBlock);
ASSERT(codeBlock->alternative());
ASSERT(codeBlock->alternative()->getJITType() == JITCode::BaselineJIT);
ASSERT(osrEntryBytecodeIndex != UINT_MAX);
if (!Options::useDFGJIT())
return false;
if (!Options::bytecodeRangeToDFGCompile().isInRange(codeBlock->instructionCount()))
return false;
if (logCompilationChanges())
dataLog("DFG compiling ", *codeBlock, ", number of instructions = ", codeBlock->instructionCount(), "\n");
// Derive our set of must-handle values. The compilation must be at least conservative
// enough to allow for OSR entry with these values.
unsigned numVarsWithValues;
if (osrEntryBytecodeIndex)
numVarsWithValues = codeBlock->m_numVars;
else
numVarsWithValues = 0;
Operands<JSValue> mustHandleValues(codeBlock->numParameters(), numVarsWithValues);
for (size_t i = 0; i < mustHandleValues.size(); ++i) {
int operand = mustHandleValues.operandForIndex(i);
if (operandIsArgument(operand)
&& !operandToArgument(operand)
&& compileMode == CompileFunction
&& codeBlock->specializationKind() == CodeForConstruct) {
// Ugh. If we're in a constructor, the 'this' argument may hold garbage. It will
// also never be used. It doesn't matter what we put into the value for this,
// but it has to be an actual value that can be grokked by subsequent DFG passes,
// so we sanitize it here by turning it into Undefined.
mustHandleValues[i] = jsUndefined();
} else
mustHandleValues[i] = exec->uncheckedR(operand).jsValue();
}
Graph dfg(exec->vm(), codeBlock, osrEntryBytecodeIndex, mustHandleValues);
if (!parse(exec, dfg))
return false;
// By this point the DFG bytecode parser will have potentially mutated various tables
// in the CodeBlock. This is a good time to perform an early shrink, which is more
// powerful than a late one. It's safe to do so because we haven't generated any code
// that references any of the tables directly, yet.
codeBlock->shrinkToFit(CodeBlock::EarlyShrink);
if (validationEnabled())
validate(dfg);
performCPSRethreading(dfg);
performUnification(dfg);
performPredictionInjection(dfg);
if (validationEnabled())
validate(dfg);
performBackwardsPropagation(dfg);
performPredictionPropagation(dfg);
performFixup(dfg);
performTypeCheckHoisting(dfg);
dfg.m_fixpointState = FixpointNotConverged;
performCSE(dfg);
performArgumentsSimplification(dfg);
performCPSRethreading(dfg); // This should usually be a no-op since CSE rarely dethreads, and arguments simplification rarely does anything.
performCFA(dfg);
performConstantFolding(dfg);
performCFGSimplification(dfg);
dfg.m_fixpointState = FixpointConverged;
performStoreElimination(dfg);
performCPSRethreading(dfg);
performDCE(dfg);
performVirtualRegisterAllocation(dfg);
GraphDumpMode modeForFinalValidate = DumpGraph;
if (verboseCompilationEnabled()) {
dataLogF("Graph after optimization:\n");
dfg.dump();
modeForFinalValidate = DontDumpGraph;
}
if (validationEnabled())
validate(dfg, modeForFinalValidate);
JITCompiler dataFlowJIT(dfg);
bool result;
if (compileMode == CompileFunction) {
ASSERT(jitCodeWithArityCheck);
result = dataFlowJIT.compileFunction(jitCode, *jitCodeWithArityCheck);
} else {
ASSERT(compileMode == CompileOther);
ASSERT(!jitCodeWithArityCheck);
result = dataFlowJIT.compile(jitCode);
}
return result;
}
Plan::CompilationPath Plan::compileInThreadImpl(LongLivedState& longLivedState)
{
Graph dfg(vm, *this, longLivedState);
if (!parse(dfg)) {
finalizer = adoptPtr(new FailedFinalizer(*this));
return FailPath;
}
// By this point the DFG bytecode parser will have potentially mutated various tables
// in the CodeBlock. This is a good time to perform an early shrink, which is more
// powerful than a late one. It's safe to do so because we haven't generated any code
// that references any of the tables directly, yet.
codeBlock->shrinkToFit(CodeBlock::EarlyShrink);
if (validationEnabled())
validate(dfg);
performCPSRethreading(dfg);
performUnification(dfg);
performPredictionInjection(dfg);
if (validationEnabled())
validate(dfg);
performBackwardsPropagation(dfg);
performPredictionPropagation(dfg);
performFixup(dfg);
performTypeCheckHoisting(dfg);
unsigned count = 1;
dfg.m_fixpointState = FixpointNotConverged;
for (;; ++count) {
if (logCompilationChanges())
dataLogF("DFG beginning optimization fixpoint iteration #%u.\n", count);
bool changed = false;
if (validationEnabled())
validate(dfg);
performCFA(dfg);
changed |= performConstantFolding(dfg);
changed |= performArgumentsSimplification(dfg);
changed |= performCFGSimplification(dfg);
changed |= performCSE(dfg);
if (!changed)
break;
performCPSRethreading(dfg);
}
if (logCompilationChanges())
dataLogF("DFG optimization fixpoint converged in %u iterations.\n", count);
dfg.m_fixpointState = FixpointConverged;
performStoreElimination(dfg);
// If we're doing validation, then run some analyses, to give them an opportunity
// to self-validate. Now is as good a time as any to do this.
if (validationEnabled()) {
dfg.m_dominators.computeIfNecessary(dfg);
dfg.m_naturalLoops.computeIfNecessary(dfg);
}
#if ENABLE(FTL_JIT)
if (Options::useExperimentalFTL()
&& compileMode == CompileFunction
&& FTL::canCompile(dfg)) {
performCriticalEdgeBreaking(dfg);
performLoopPreHeaderCreation(dfg);
performCPSRethreading(dfg);
performSSAConversion(dfg);
performLivenessAnalysis(dfg);
performCFA(dfg);
performLICM(dfg);
performLivenessAnalysis(dfg);
performCFA(dfg);
performDCE(dfg); // We rely on this to convert dead SetLocals into the appropriate hint, and to kill dead code that won't be recognized as dead by LLVM.
performLivenessAnalysis(dfg);
performFlushLivenessAnalysis(dfg);
performOSRAvailabilityAnalysis(dfg);
dumpAndVerifyGraph(dfg, "Graph just before FTL lowering:");
// FIXME: Support OSR entry.
// https://bugs.webkit.org/show_bug.cgi?id=113625
FTL::State state(dfg);
FTL::lowerDFGToLLVM(state);
if (Options::reportCompileTimes())
beforeFTL = currentTimeMS();
if (Options::llvmAlwaysFails()) {
FTL::fail(state);
return FTLPath;
}
FTL::compile(state);
FTL::link(state);
return FTLPath;
}
#endif // ENABLE(FTL_JIT)
performCPSRethreading(dfg);
performDCE(dfg);
performVirtualRegisterAllocation(dfg);
dumpAndVerifyGraph(dfg, "Graph after optimization:");
JITCompiler dataFlowJIT(dfg);
if (compileMode == CompileFunction) {
dataFlowJIT.compileFunction();
dataFlowJIT.linkFunction();
} else {
ASSERT(compileMode == CompileOther);
dataFlowJIT.compile();
dataFlowJIT.link();
}
return DFGPath;
}