void Plan::compileInThread(LongLivedState& longLivedState, ThreadData* threadData) { this->threadData = threadData; double before = 0; CString codeBlockName; if (UNLIKELY(computeCompileTimes())) before = monotonicallyIncreasingTimeMS(); if (UNLIKELY(reportCompileTimes())) codeBlockName = toCString(*codeBlock); CompilationScope compilationScope; if (logCompilationChanges(mode) || Options::reportDFGPhaseTimes()) dataLog("DFG(Plan) compiling ", *codeBlock, " with ", mode, ", number of instructions = ", codeBlock->instructionCount(), "\n"); CompilationPath path = compileInThreadImpl(longLivedState); RELEASE_ASSERT(path == CancelPath || finalizer); RELEASE_ASSERT((path == CancelPath) == (stage == Cancelled)); double after = 0; if (UNLIKELY(computeCompileTimes())) { after = monotonicallyIncreasingTimeMS(); if (Options::reportTotalCompileTimes()) { if (isFTL(mode)) { totalFTLCompileTime += after - before; totalFTLDFGCompileTime += m_timeBeforeFTL - before; totalFTLB3CompileTime += after - m_timeBeforeFTL; } else totalDFGCompileTime += after - before; } } const char* pathName = nullptr; switch (path) { case FailPath: pathName = "N/A (fail)"; break; case DFGPath: pathName = "DFG"; break; case FTLPath: pathName = "FTL"; break; case CancelPath: pathName = "Cancelled"; break; default: RELEASE_ASSERT_NOT_REACHED(); break; } if (codeBlock) { // codeBlock will be null if the compilation was cancelled. if (path == FTLPath) CODEBLOCK_LOG_EVENT(codeBlock, "ftlCompile", ("took ", after - before, " ms (DFG: ", m_timeBeforeFTL - before, ", B3: ", after - m_timeBeforeFTL, ") with ", pathName)); else CODEBLOCK_LOG_EVENT(codeBlock, "dfgCompile", ("took ", after - before, " ms with ", pathName)); } if (UNLIKELY(reportCompileTimes())) { dataLog("Optimized ", codeBlockName, " using ", mode, " with ", pathName, " into ", finalizer ? finalizer->codeSize() : 0, " bytes in ", after - before, " ms"); if (path == FTLPath) dataLog(" (DFG: ", m_timeBeforeFTL - before, ", B3: ", after - m_timeBeforeFTL, ")"); dataLog(".\n"); } }
Plan::CompilationPath Plan::compileInThreadImpl(LongLivedState& longLivedState) { cleanMustHandleValuesIfNecessary(); if (verboseCompilationEnabled(mode) && 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 = std::make_unique<FailedFinalizer>(*this); return FailPath; } codeBlock->setCalleeSaveRegisters(RegisterSet::dfgCalleeSaveRegisters()); // 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); if (Options::dumpGraphAfterParsing()) { dataLog("Graph after parsing:\n"); dfg.dump(); } performLiveCatchVariablePreservationPhase(dfg); if (Options::useMaximalFlushInsertionPhase()) performMaximalFlushInsertion(dfg); performCPSRethreading(dfg); performUnification(dfg); performPredictionInjection(dfg); performStaticExecutionCountEstimation(dfg); if (mode == FTLForOSREntryMode) { bool result = performOSREntrypointCreation(dfg); if (!result) { finalizer = std::make_unique<FailedFinalizer>(*this); return FailPath; } performCPSRethreading(dfg); } if (validationEnabled()) validate(dfg); performBackwardsPropagation(dfg); performPredictionPropagation(dfg); performFixup(dfg); performStructureRegistration(dfg); performInvalidationPointInjection(dfg); performTypeCheckHoisting(dfg); dfg.m_fixpointState = FixpointNotConverged; // For now we're back to avoiding a fixpoint. Note that we've ping-ponged on this decision // many times. For maximum throughput, it's best to fixpoint. But the throughput benefit is // small and not likely to show up in FTL anyway. On the other hand, not fixpointing means // that the compiler compiles more quickly. We want the third tier to compile quickly, which // not fixpointing accomplishes; and the fourth tier shouldn't need a fixpoint. if (validationEnabled()) validate(dfg); performStrengthReduction(dfg); performCPSRethreading(dfg); performCFA(dfg); performConstantFolding(dfg); bool changed = false; changed |= performCFGSimplification(dfg); changed |= performLocalCSE(dfg); if (validationEnabled()) validate(dfg); performCPSRethreading(dfg); if (!isFTL(mode)) { // Only run this if we're not FTLing, because currently for a LoadVarargs that is forwardable and // in a non-varargs inlined call frame, this will generate ForwardVarargs while the FTL // ArgumentsEliminationPhase will create a sequence of GetStack+PutStacks. The GetStack+PutStack // sequence then gets sunk, eliminating anything that looks like an escape for subsequent phases, // while the ForwardVarargs doesn't get simplified until later (or not at all) and looks like an // escape for all of the arguments. This then disables object allocation sinking. // // So, for now, we just disable this phase for the FTL. // // If we wanted to enable it, we'd have to do any of the following: // - Enable ForwardVarargs->GetStack+PutStack strength reduction, and have that run before // PutStack sinking and object allocation sinking. // - Make VarargsForwarding emit a GetLocal+SetLocal sequence, that we can later turn into // GetStack+PutStack. // // But, it's not super valuable to enable those optimizations, since the FTL // ArgumentsEliminationPhase does everything that this phase does, and it doesn't introduce this // pathology. changed |= performVarargsForwarding(dfg); // Do this after CFG simplification and CPS rethreading. } if (changed) { performCFA(dfg); performConstantFolding(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.ensureDominators(); dfg.ensureNaturalLoops(); dfg.ensurePrePostNumbering(); } switch (mode) { case DFGMode: { dfg.m_fixpointState = FixpointConverged; performTierUpCheckInjection(dfg); performFastStoreBarrierInsertion(dfg); performStoreBarrierClustering(dfg); performCleanUp(dfg); performCPSRethreading(dfg); performDCE(dfg); performPhantomInsertion(dfg); performStackLayout(dfg); performVirtualRegisterAllocation(dfg); performWatchpointCollection(dfg); dumpAndVerifyGraph(dfg, "Graph after optimization:"); JITCompiler dataFlowJIT(dfg); if (codeBlock->codeType() == FunctionCode) dataFlowJIT.compileFunction(); else dataFlowJIT.compile(); return DFGPath; } case FTLMode: case FTLForOSREntryMode: { #if ENABLE(FTL_JIT) if (FTL::canCompile(dfg) == FTL::CannotCompile) { finalizer = std::make_unique<FailedFinalizer>(*this); return FailPath; } performCleanUp(dfg); // Reduce the graph size a bit. performCriticalEdgeBreaking(dfg); if (Options::createPreHeaders()) performLoopPreHeaderCreation(dfg); performCPSRethreading(dfg); performSSAConversion(dfg); performSSALowering(dfg); // Ideally, these would be run to fixpoint with the object allocation sinking phase. performArgumentsElimination(dfg); if (Options::usePutStackSinking()) performPutStackSinking(dfg); performConstantHoisting(dfg); performGlobalCSE(dfg); performLivenessAnalysis(dfg); performCFA(dfg); performConstantFolding(dfg); performCleanUp(dfg); // Reduce the graph size a lot. changed = false; changed |= performStrengthReduction(dfg); if (Options::useObjectAllocationSinking()) { changed |= performCriticalEdgeBreaking(dfg); changed |= performObjectAllocationSinking(dfg); } if (changed) { // State-at-tail and state-at-head will be invalid if we did strength reduction since // it might increase live ranges. performLivenessAnalysis(dfg); performCFA(dfg); performConstantFolding(dfg); } // Currently, this relies on pre-headers still being valid. That precludes running CFG // simplification before it, unless we re-created the pre-headers. There wouldn't be anything // wrong with running LICM earlier, if we wanted to put other CFG transforms above this point. // Alternatively, we could run loop pre-header creation after SSA conversion - but if we did that // then we'd need to do some simple SSA fix-up. performLivenessAnalysis(dfg); performCFA(dfg); performLICM(dfg); // FIXME: Currently: IntegerRangeOptimization *must* be run after LICM. // // IntegerRangeOptimization makes changes on nodes based on preceding blocks // and nodes. LICM moves nodes which can invalidates assumptions used // by IntegerRangeOptimization. // // Ideally, the dependencies should be explicit. See https://bugs.webkit.org/show_bug.cgi?id=157534. performLivenessAnalysis(dfg); performIntegerRangeOptimization(dfg); performCleanUp(dfg); performIntegerCheckCombining(dfg); performGlobalCSE(dfg); // At this point we're not allowed to do any further code motion because our reasoning // about code motion assumes that it's OK to insert GC points in random places. dfg.m_fixpointState = FixpointConverged; performLivenessAnalysis(dfg); performCFA(dfg); performGlobalStoreBarrierInsertion(dfg); performStoreBarrierClustering(dfg); if (Options::useMovHintRemoval()) performMovHintRemoval(dfg); performCleanUp(dfg); performDCE(dfg); // We rely on this to kill dead code that won't be recognized as dead by B3. performStackLayout(dfg); performLivenessAnalysis(dfg); performOSRAvailabilityAnalysis(dfg); performWatchpointCollection(dfg); if (FTL::canCompile(dfg) == FTL::CannotCompile) { finalizer = std::make_unique<FailedFinalizer>(*this); return FailPath; } dumpAndVerifyGraph(dfg, "Graph just before FTL lowering:", shouldDumpDisassembly(mode)); // Flash a safepoint in case the GC wants some action. Safepoint::Result safepointResult; { GraphSafepoint safepoint(dfg, safepointResult); } if (safepointResult.didGetCancelled()) return CancelPath; FTL::State state(dfg); FTL::lowerDFGToB3(state); if (UNLIKELY(computeCompileTimes())) m_timeBeforeFTL = monotonicallyIncreasingTimeMS(); if (Options::b3AlwaysFailsBeforeCompile()) { FTL::fail(state); return FTLPath; } FTL::compile(state, safepointResult); if (safepointResult.didGetCancelled()) return CancelPath; if (Options::b3AlwaysFailsBeforeLink()) { FTL::fail(state); return FTLPath; } if (state.allocationFailed) { FTL::fail(state); return FTLPath; } FTL::link(state); if (state.allocationFailed) { FTL::fail(state); return FTLPath; } return FTLPath; #else RELEASE_ASSERT_NOT_REACHED(); return FailPath; #endif // ENABLE(FTL_JIT) } default: RELEASE_ASSERT_NOT_REACHED(); return FailPath; } }
void Plan::compileInThread(LongLivedState& longLivedState, ThreadData* threadData) { this->threadData = threadData; double before = 0; CString codeBlockName; if (computeCompileTimes()) before = monotonicallyIncreasingTimeMS(); if (reportCompileTimes()) codeBlockName = toCString(*codeBlock); SamplingRegion samplingRegion("DFG Compilation (Plan)"); CompilationScope compilationScope; if (logCompilationChanges(mode)) dataLog("DFG(Plan) compiling ", *codeBlock, " with ", mode, ", number of instructions = ", codeBlock->instructionCount(), "\n"); CompilationPath path = compileInThreadImpl(longLivedState); RELEASE_ASSERT(path == CancelPath || finalizer); RELEASE_ASSERT((path == CancelPath) == (stage == Cancelled)); double after = 0; if (computeCompileTimes()) after = monotonicallyIncreasingTimeMS(); if (Options::reportTotalCompileTimes()) { if (isFTL(mode)) { totalFTLCompileTime += after - before; totalFTLDFGCompileTime += m_timeBeforeFTL - before; totalFTLB3CompileTime += after - m_timeBeforeFTL; } else totalDFGCompileTime += after - before; } if (reportCompileTimes()) { const char* pathName; switch (path) { case FailPath: pathName = "N/A (fail)"; break; case DFGPath: pathName = "DFG"; break; case FTLPath: pathName = "FTL"; break; case CancelPath: pathName = "Cancelled"; break; default: RELEASE_ASSERT_NOT_REACHED(); #if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE) pathName = ""; #endif break; } dataLog("Optimized ", codeBlockName, " using ", mode, " with ", pathName, " into ", finalizer ? finalizer->codeSize() : 0, " bytes in ", after - before, " ms"); if (path == FTLPath) dataLog(" (DFG: ", m_timeBeforeFTL - before, ", B3: ", after - m_timeBeforeFTL, ")"); dataLog(".\n"); } }