| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/codegen/compiler.h" |
| |
| #include <algorithm> |
| #include <memory> |
| |
| #include "src/api/api-inl.h" |
| #include "src/asmjs/asm-js.h" |
| #include "src/ast/prettyprinter.h" |
| #include "src/ast/scopes.h" |
| #include "src/base/optional.h" |
| #include "src/codegen/assembler-inl.h" |
| #include "src/codegen/compilation-cache.h" |
| #include "src/codegen/optimized-compilation-info.h" |
| #include "src/codegen/pending-optimization-table.h" |
| #include "src/codegen/unoptimized-compilation-info.h" |
| #include "src/common/globals.h" |
| #include "src/common/message-template.h" |
| #include "src/compiler-dispatcher/compiler-dispatcher.h" |
| #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h" |
| #include "src/compiler/pipeline.h" |
| #include "src/debug/debug.h" |
| #include "src/debug/liveedit.h" |
| #include "src/execution/frames-inl.h" |
| #include "src/execution/isolate-inl.h" |
| #include "src/execution/runtime-profiler.h" |
| #include "src/execution/vm-state-inl.h" |
| #include "src/heap/heap-inl.h" |
| #include "src/init/bootstrapper.h" |
| #include "src/interpreter/interpreter.h" |
| #include "src/logging/log-inl.h" |
| #include "src/objects/feedback-cell-inl.h" |
| #include "src/objects/map.h" |
| #include "src/parsing/parse-info.h" |
| #include "src/parsing/parser.h" |
| #include "src/parsing/parsing.h" |
| #include "src/parsing/rewriter.h" |
| #include "src/parsing/scanner-character-streams.h" |
| #include "src/snapshot/code-serializer.h" |
| #include "src/utils/ostreams.h" |
| #include "src/zone/zone-list-inl.h" // crbug.com/v8/8816 |
| |
| namespace v8 { |
| namespace internal { |
| |
| // A wrapper around a OptimizedCompilationInfo that detaches the Handles from |
| // the underlying DeferredHandleScope and stores them in info_ on |
| // destruction. |
| class CompilationHandleScope final { |
| public: |
| explicit CompilationHandleScope(Isolate* isolate, |
| OptimizedCompilationInfo* info) |
| : deferred_(isolate), info_(info) {} |
| ~CompilationHandleScope() { info_->set_deferred_handles(deferred_.Detach()); } |
| |
| private: |
| DeferredHandleScope deferred_; |
| OptimizedCompilationInfo* info_; |
| }; |
| |
| // Helper that times a scoped region and records the elapsed time. |
| struct ScopedTimer { |
| explicit ScopedTimer(base::TimeDelta* location) : location_(location) { |
| DCHECK_NOT_NULL(location_); |
| timer_.Start(); |
| } |
| |
| ~ScopedTimer() { *location_ += timer_.Elapsed(); } |
| |
| base::ElapsedTimer timer_; |
| base::TimeDelta* location_; |
| }; |
| |
| namespace { |
| |
| void LogFunctionCompilation(CodeEventListener::LogEventsAndTags tag, |
| Handle<SharedFunctionInfo> shared, |
| Handle<Script> script, |
| Handle<AbstractCode> abstract_code, bool optimizing, |
| double time_taken_ms, Isolate* isolate) { |
| DCHECK(!abstract_code.is_null()); |
| DCHECK(!abstract_code.is_identical_to(BUILTIN_CODE(isolate, CompileLazy))); |
| |
| // Log the code generation. If source information is available include |
| // script name and line number. Check explicitly whether logging is |
| // enabled as finding the line number is not free. |
| if (!isolate->logger()->is_listening_to_code_events() && |
| !isolate->is_profiling() && !FLAG_log_function_events && |
| !isolate->code_event_dispatcher()->IsListeningToCodeEvents()) { |
| return; |
| } |
| |
| int line_num = Script::GetLineNumber(script, shared->StartPosition()) + 1; |
| int column_num = Script::GetColumnNumber(script, shared->StartPosition()) + 1; |
| String script_name = script->name().IsString() |
| ? String::cast(script->name()) |
| : ReadOnlyRoots(isolate).empty_string(); |
| CodeEventListener::LogEventsAndTags log_tag = |
| Logger::ToNativeByScript(tag, *script); |
| PROFILE(isolate, CodeCreateEvent(log_tag, *abstract_code, *shared, |
| script_name, line_num, column_num)); |
| if (!FLAG_log_function_events) return; |
| |
| DisallowHeapAllocation no_gc; |
| |
| std::string name = optimizing ? "optimize" : "compile"; |
| switch (tag) { |
| case CodeEventListener::EVAL_TAG: |
| name += "-eval"; |
| break; |
| case CodeEventListener::SCRIPT_TAG: |
| break; |
| case CodeEventListener::LAZY_COMPILE_TAG: |
| name += "-lazy"; |
| break; |
| case CodeEventListener::FUNCTION_TAG: |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| |
| LOG(isolate, FunctionEvent(name.c_str(), script->id(), time_taken_ms, |
| shared->StartPosition(), shared->EndPosition(), |
| shared->DebugName())); |
| } |
| |
| ScriptOriginOptions OriginOptionsForEval(Object script) { |
| if (!script.IsScript()) return ScriptOriginOptions(); |
| |
| const auto outer_origin_options = Script::cast(script).origin_options(); |
| return ScriptOriginOptions(outer_origin_options.IsSharedCrossOrigin(), |
| outer_origin_options.IsOpaque()); |
| } |
| |
| } // namespace |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation of UnoptimizedCompilationJob |
| |
| CompilationJob::Status UnoptimizedCompilationJob::ExecuteJob() { |
| DisallowHeapAccess no_heap_access; |
| // Delegate to the underlying implementation. |
| DCHECK_EQ(state(), State::kReadyToExecute); |
| ScopedTimer t(&time_taken_to_execute_); |
| return UpdateState(ExecuteJobImpl(), State::kReadyToFinalize); |
| } |
| |
| CompilationJob::Status UnoptimizedCompilationJob::FinalizeJob( |
| Handle<SharedFunctionInfo> shared_info, Isolate* isolate) { |
| DCHECK_EQ(ThreadId::Current(), isolate->thread_id()); |
| DisallowCodeDependencyChange no_dependency_change; |
| DisallowJavascriptExecution no_js(isolate); |
| |
| // Delegate to the underlying implementation. |
| DCHECK_EQ(state(), State::kReadyToFinalize); |
| ScopedTimer t(&time_taken_to_finalize_); |
| return UpdateState(FinalizeJobImpl(shared_info, isolate), State::kSucceeded); |
| } |
| |
| void UnoptimizedCompilationJob::RecordCompilationStats(Isolate* isolate) const { |
| int code_size; |
| if (compilation_info()->has_bytecode_array()) { |
| code_size = compilation_info()->bytecode_array()->SizeIncludingMetadata(); |
| } else { |
| DCHECK(compilation_info()->has_asm_wasm_data()); |
| code_size = compilation_info()->asm_wasm_data()->Size(); |
| } |
| |
| Counters* counters = isolate->counters(); |
| // TODO(4280): Rename counters from "baseline" to "unoptimized" eventually. |
| counters->total_baseline_code_size()->Increment(code_size); |
| counters->total_baseline_compile_count()->Increment(1); |
| |
| // TODO(5203): Add timers for each phase of compilation. |
| // Also add total time (there's now already timer_ on the base class). |
| } |
| |
| void UnoptimizedCompilationJob::RecordFunctionCompilation( |
| CodeEventListener::LogEventsAndTags tag, Handle<SharedFunctionInfo> shared, |
| Isolate* isolate) const { |
| Handle<AbstractCode> abstract_code; |
| if (compilation_info()->has_bytecode_array()) { |
| abstract_code = |
| Handle<AbstractCode>::cast(compilation_info()->bytecode_array()); |
| } else { |
| DCHECK(compilation_info()->has_asm_wasm_data()); |
| abstract_code = |
| Handle<AbstractCode>::cast(BUILTIN_CODE(isolate, InstantiateAsmJs)); |
| } |
| |
| double time_taken_ms = time_taken_to_execute_.InMillisecondsF() + |
| time_taken_to_finalize_.InMillisecondsF(); |
| |
| LogFunctionCompilation(tag, shared, parse_info()->script(), abstract_code, |
| false, time_taken_ms, isolate); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation of OptimizedCompilationJob |
| |
| CompilationJob::Status OptimizedCompilationJob::PrepareJob(Isolate* isolate) { |
| DCHECK_EQ(ThreadId::Current(), isolate->thread_id()); |
| DisallowJavascriptExecution no_js(isolate); |
| |
| if (FLAG_trace_opt && compilation_info()->IsOptimizing()) { |
| StdoutStream os; |
| os << "[compiling method " << Brief(*compilation_info()->closure()) |
| << " using " << compiler_name_; |
| if (compilation_info()->is_osr()) os << " OSR"; |
| os << "]" << std::endl; |
| } |
| |
| // Delegate to the underlying implementation. |
| DCHECK_EQ(state(), State::kReadyToPrepare); |
| ScopedTimer t(&time_taken_to_prepare_); |
| return UpdateState(PrepareJobImpl(isolate), State::kReadyToExecute); |
| } |
| |
| CompilationJob::Status OptimizedCompilationJob::ExecuteJob() { |
| DisallowHeapAccess no_heap_access; |
| // Delegate to the underlying implementation. |
| DCHECK_EQ(state(), State::kReadyToExecute); |
| ScopedTimer t(&time_taken_to_execute_); |
| return UpdateState(ExecuteJobImpl(), State::kReadyToFinalize); |
| } |
| |
| CompilationJob::Status OptimizedCompilationJob::FinalizeJob(Isolate* isolate) { |
| DCHECK_EQ(ThreadId::Current(), isolate->thread_id()); |
| DisallowJavascriptExecution no_js(isolate); |
| |
| // Delegate to the underlying implementation. |
| DCHECK_EQ(state(), State::kReadyToFinalize); |
| ScopedTimer t(&time_taken_to_finalize_); |
| return UpdateState(FinalizeJobImpl(isolate), State::kSucceeded); |
| } |
| |
| CompilationJob::Status OptimizedCompilationJob::RetryOptimization( |
| BailoutReason reason) { |
| DCHECK(compilation_info_->IsOptimizing()); |
| compilation_info_->RetryOptimization(reason); |
| return UpdateState(FAILED, State::kFailed); |
| } |
| |
| CompilationJob::Status OptimizedCompilationJob::AbortOptimization( |
| BailoutReason reason) { |
| DCHECK(compilation_info_->IsOptimizing()); |
| compilation_info_->AbortOptimization(reason); |
| return UpdateState(FAILED, State::kFailed); |
| } |
| |
| void OptimizedCompilationJob::RecordCompilationStats(CompilationMode mode, |
| Isolate* isolate) const { |
| DCHECK(compilation_info()->IsOptimizing()); |
| Handle<JSFunction> function = compilation_info()->closure(); |
| double ms_creategraph = time_taken_to_prepare_.InMillisecondsF(); |
| double ms_optimize = time_taken_to_execute_.InMillisecondsF(); |
| double ms_codegen = time_taken_to_finalize_.InMillisecondsF(); |
| if (FLAG_trace_opt) { |
| PrintF("[optimizing "); |
| function->ShortPrint(); |
| PrintF(" - took %0.3f, %0.3f, %0.3f ms]\n", ms_creategraph, ms_optimize, |
| ms_codegen); |
| } |
| if (FLAG_trace_opt_stats) { |
| static double compilation_time = 0.0; |
| static int compiled_functions = 0; |
| static int code_size = 0; |
| |
| compilation_time += (ms_creategraph + ms_optimize + ms_codegen); |
| compiled_functions++; |
| code_size += function->shared().SourceSize(); |
| PrintF("Compiled: %d functions with %d byte source size in %fms.\n", |
| compiled_functions, code_size, compilation_time); |
| } |
| // Don't record samples from machines without high-resolution timers, |
| // as that can cause serious reporting issues. See the thread at |
| // http://g/chrome-metrics-team/NwwJEyL8odU/discussion for more details. |
| if (base::TimeTicks::IsHighResolution()) { |
| Counters* const counters = isolate->counters(); |
| if (compilation_info()->is_osr()) { |
| counters->turbofan_osr_prepare()->AddSample( |
| static_cast<int>(time_taken_to_prepare_.InMicroseconds())); |
| counters->turbofan_osr_execute()->AddSample( |
| static_cast<int>(time_taken_to_execute_.InMicroseconds())); |
| counters->turbofan_osr_finalize()->AddSample( |
| static_cast<int>(time_taken_to_finalize_.InMicroseconds())); |
| counters->turbofan_osr_total_time()->AddSample( |
| static_cast<int>(ElapsedTime().InMicroseconds())); |
| } else { |
| counters->turbofan_optimize_prepare()->AddSample( |
| static_cast<int>(time_taken_to_prepare_.InMicroseconds())); |
| counters->turbofan_optimize_execute()->AddSample( |
| static_cast<int>(time_taken_to_execute_.InMicroseconds())); |
| counters->turbofan_optimize_finalize()->AddSample( |
| static_cast<int>(time_taken_to_finalize_.InMicroseconds())); |
| counters->turbofan_optimize_total_time()->AddSample( |
| static_cast<int>(ElapsedTime().InMicroseconds())); |
| |
| // Compute foreground / background time. |
| base::TimeDelta time_background; |
| base::TimeDelta time_foreground = |
| time_taken_to_prepare_ + time_taken_to_finalize_; |
| switch (mode) { |
| case OptimizedCompilationJob::kConcurrent: |
| time_background += time_taken_to_execute_; |
| counters->turbofan_optimize_concurrent_total_time()->AddSample( |
| static_cast<int>(ElapsedTime().InMicroseconds())); |
| break; |
| case OptimizedCompilationJob::kSynchronous: |
| counters->turbofan_optimize_non_concurrent_total_time()->AddSample( |
| static_cast<int>(ElapsedTime().InMicroseconds())); |
| time_foreground += time_taken_to_execute_; |
| break; |
| } |
| counters->turbofan_optimize_total_background()->AddSample( |
| static_cast<int>(time_background.InMicroseconds())); |
| counters->turbofan_optimize_total_foreground()->AddSample( |
| static_cast<int>(time_foreground.InMicroseconds())); |
| } |
| counters->turbofan_ticks()->AddSample(static_cast<int>( |
| compilation_info()->tick_counter().CurrentTicks() / 1000)); |
| } |
| } |
| |
| void OptimizedCompilationJob::RecordFunctionCompilation( |
| CodeEventListener::LogEventsAndTags tag, Isolate* isolate) const { |
| Handle<AbstractCode> abstract_code = |
| Handle<AbstractCode>::cast(compilation_info()->code()); |
| |
| double time_taken_ms = time_taken_to_prepare_.InMillisecondsF() + |
| time_taken_to_execute_.InMillisecondsF() + |
| time_taken_to_finalize_.InMillisecondsF(); |
| |
| Handle<Script> script( |
| Script::cast(compilation_info()->shared_info()->script()), isolate); |
| LogFunctionCompilation(tag, compilation_info()->shared_info(), script, |
| abstract_code, true, time_taken_ms, isolate); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Local helper methods that make up the compilation pipeline. |
| |
| namespace { |
| |
| bool UseAsmWasm(FunctionLiteral* literal, bool asm_wasm_broken) { |
| // Check whether asm.js validation is enabled. |
| if (!FLAG_validate_asm) return false; |
| |
| // Modules that have validated successfully, but were subsequently broken by |
| // invalid module instantiation attempts are off limit forever. |
| if (asm_wasm_broken) return false; |
| |
| // In stress mode we want to run the validator on everything. |
| if (FLAG_stress_validate_asm) return true; |
| |
| // In general, we respect the "use asm" directive. |
| return literal->scope()->IsAsmModule(); |
| } |
| |
| void InstallBytecodeArray(Handle<BytecodeArray> bytecode_array, |
| Handle<SharedFunctionInfo> shared_info, |
| ParseInfo* parse_info, Isolate* isolate) { |
| if (!FLAG_interpreted_frames_native_stack) { |
| shared_info->set_bytecode_array(*bytecode_array); |
| return; |
| } |
| |
| Handle<Code> code = isolate->factory()->CopyCode(Handle<Code>::cast( |
| isolate->factory()->interpreter_entry_trampoline_for_profiling())); |
| |
| Handle<InterpreterData> interpreter_data = |
| Handle<InterpreterData>::cast(isolate->factory()->NewStruct( |
| INTERPRETER_DATA_TYPE, AllocationType::kOld)); |
| |
| interpreter_data->set_bytecode_array(*bytecode_array); |
| interpreter_data->set_interpreter_trampoline(*code); |
| |
| shared_info->set_interpreter_data(*interpreter_data); |
| |
| Handle<Script> script = parse_info->script(); |
| Handle<AbstractCode> abstract_code = Handle<AbstractCode>::cast(code); |
| int line_num = |
| Script::GetLineNumber(script, shared_info->StartPosition()) + 1; |
| int column_num = |
| Script::GetColumnNumber(script, shared_info->StartPosition()) + 1; |
| String script_name = script->name().IsString() |
| ? String::cast(script->name()) |
| : ReadOnlyRoots(isolate).empty_string(); |
| CodeEventListener::LogEventsAndTags log_tag = Logger::ToNativeByScript( |
| CodeEventListener::INTERPRETED_FUNCTION_TAG, *script); |
| PROFILE(isolate, CodeCreateEvent(log_tag, *abstract_code, *shared_info, |
| script_name, line_num, column_num)); |
| } |
| |
| void InstallUnoptimizedCode(UnoptimizedCompilationInfo* compilation_info, |
| Handle<SharedFunctionInfo> shared_info, |
| ParseInfo* parse_info, Isolate* isolate) { |
| DCHECK_EQ(shared_info->language_mode(), |
| compilation_info->literal()->language_mode()); |
| |
| // Update the shared function info with the scope info. |
| Handle<ScopeInfo> scope_info = compilation_info->scope()->scope_info(); |
| shared_info->set_scope_info(*scope_info); |
| |
| if (compilation_info->has_bytecode_array()) { |
| DCHECK(!shared_info->HasBytecodeArray()); // Only compiled once. |
| DCHECK(!compilation_info->has_asm_wasm_data()); |
| DCHECK(!shared_info->HasFeedbackMetadata()); |
| |
| InstallBytecodeArray(compilation_info->bytecode_array(), shared_info, |
| parse_info, isolate); |
| |
| Handle<FeedbackMetadata> feedback_metadata = FeedbackMetadata::New( |
| isolate, compilation_info->feedback_vector_spec()); |
| shared_info->set_feedback_metadata(*feedback_metadata); |
| } else { |
| DCHECK(compilation_info->has_asm_wasm_data()); |
| shared_info->set_asm_wasm_data(*compilation_info->asm_wasm_data()); |
| shared_info->set_feedback_metadata( |
| ReadOnlyRoots(isolate).empty_feedback_metadata()); |
| } |
| |
| // Install coverage info on the shared function info. |
| if (compilation_info->has_coverage_info() && |
| !shared_info->HasCoverageInfo()) { |
| DCHECK(isolate->is_block_code_coverage()); |
| isolate->debug()->InstallCoverageInfo(shared_info, |
| compilation_info->coverage_info()); |
| } |
| } |
| |
| void EnsureSharedFunctionInfosArrayOnScript(ParseInfo* parse_info, |
| Isolate* isolate) { |
| DCHECK(parse_info->is_toplevel()); |
| DCHECK(!parse_info->script().is_null()); |
| if (parse_info->script()->shared_function_infos().length() > 0) { |
| DCHECK_EQ(parse_info->script()->shared_function_infos().length(), |
| parse_info->max_function_literal_id() + 1); |
| return; |
| } |
| Handle<WeakFixedArray> infos(isolate->factory()->NewWeakFixedArray( |
| parse_info->max_function_literal_id() + 1)); |
| parse_info->script()->set_shared_function_infos(*infos); |
| } |
| |
| void SetSharedFunctionFlagsFromLiteral(FunctionLiteral* literal, |
| Handle<SharedFunctionInfo> shared_info) { |
| shared_info->set_has_duplicate_parameters( |
| literal->has_duplicate_parameters()); |
| shared_info->set_is_oneshot_iife(literal->is_oneshot_iife()); |
| shared_info->UpdateAndFinalizeExpectedNofPropertiesFromEstimate(literal); |
| if (literal->dont_optimize_reason() != BailoutReason::kNoReason) { |
| shared_info->DisableOptimization(literal->dont_optimize_reason()); |
| } |
| shared_info->set_is_safe_to_skip_arguments_adaptor( |
| literal->SafeToSkipArgumentsAdaptor()); |
| } |
| |
| CompilationJob::Status FinalizeUnoptimizedCompilationJob( |
| UnoptimizedCompilationJob* job, Handle<SharedFunctionInfo> shared_info, |
| Isolate* isolate) { |
| UnoptimizedCompilationInfo* compilation_info = job->compilation_info(); |
| ParseInfo* parse_info = job->parse_info(); |
| |
| SetSharedFunctionFlagsFromLiteral(compilation_info->literal(), shared_info); |
| |
| CompilationJob::Status status = job->FinalizeJob(shared_info, isolate); |
| if (status == CompilationJob::SUCCEEDED) { |
| InstallUnoptimizedCode(compilation_info, shared_info, parse_info, isolate); |
| CodeEventListener::LogEventsAndTags log_tag; |
| if (parse_info->is_toplevel()) { |
| log_tag = compilation_info->is_eval() ? CodeEventListener::EVAL_TAG |
| : CodeEventListener::SCRIPT_TAG; |
| } else { |
| log_tag = parse_info->lazy_compile() ? CodeEventListener::LAZY_COMPILE_TAG |
| : CodeEventListener::FUNCTION_TAG; |
| } |
| job->RecordFunctionCompilation(log_tag, shared_info, isolate); |
| job->RecordCompilationStats(isolate); |
| } |
| return status; |
| } |
| |
| std::unique_ptr<UnoptimizedCompilationJob> ExecuteUnoptimizedCompileJobs( |
| ParseInfo* parse_info, FunctionLiteral* literal, |
| AccountingAllocator* allocator, |
| UnoptimizedCompilationJobList* inner_function_jobs) { |
| if (UseAsmWasm(literal, parse_info->is_asm_wasm_broken())) { |
| std::unique_ptr<UnoptimizedCompilationJob> asm_job( |
| AsmJs::NewCompilationJob(parse_info, literal, allocator)); |
| if (asm_job->ExecuteJob() == CompilationJob::SUCCEEDED) { |
| return asm_job; |
| } |
| // asm.js validation failed, fall through to standard unoptimized compile. |
| // Note: we rely on the fact that AsmJs jobs have done all validation in the |
| // PrepareJob and ExecuteJob phases and can't fail in FinalizeJob with |
| // with a validation error or another error that could be solve by falling |
| // through to standard unoptimized compile. |
| } |
| std::vector<FunctionLiteral*> eager_inner_literals; |
| std::unique_ptr<UnoptimizedCompilationJob> job( |
| interpreter::Interpreter::NewCompilationJob( |
| parse_info, literal, allocator, &eager_inner_literals)); |
| |
| if (job->ExecuteJob() != CompilationJob::SUCCEEDED) { |
| // Compilation failed, return null. |
| return std::unique_ptr<UnoptimizedCompilationJob>(); |
| } |
| |
| // Recursively compile eager inner literals. |
| for (FunctionLiteral* inner_literal : eager_inner_literals) { |
| std::unique_ptr<UnoptimizedCompilationJob> inner_job( |
| ExecuteUnoptimizedCompileJobs(parse_info, inner_literal, allocator, |
| inner_function_jobs)); |
| // Compilation failed, return null. |
| if (!inner_job) return std::unique_ptr<UnoptimizedCompilationJob>(); |
| inner_function_jobs->emplace_front(std::move(inner_job)); |
| } |
| |
| return job; |
| } |
| |
| std::unique_ptr<UnoptimizedCompilationJob> GenerateUnoptimizedCode( |
| ParseInfo* parse_info, AccountingAllocator* allocator, |
| UnoptimizedCompilationJobList* inner_function_jobs) { |
| DisallowHeapAccess no_heap_access; |
| DCHECK(inner_function_jobs->empty()); |
| |
| if (!Compiler::Analyze(parse_info)) { |
| return std::unique_ptr<UnoptimizedCompilationJob>(); |
| } |
| |
| // Prepare and execute compilation of the outer-most function. |
| std::unique_ptr<UnoptimizedCompilationJob> outer_function_job( |
| ExecuteUnoptimizedCompileJobs(parse_info, parse_info->literal(), |
| allocator, inner_function_jobs)); |
| if (!outer_function_job) return std::unique_ptr<UnoptimizedCompilationJob>(); |
| |
| // Character stream shouldn't be used again. |
| parse_info->ResetCharacterStream(); |
| |
| return outer_function_job; |
| } |
| |
| MaybeHandle<SharedFunctionInfo> GenerateUnoptimizedCodeForToplevel( |
| Isolate* isolate, ParseInfo* parse_info, AccountingAllocator* allocator, |
| IsCompiledScope* is_compiled_scope) { |
| EnsureSharedFunctionInfosArrayOnScript(parse_info, isolate); |
| parse_info->ast_value_factory()->Internalize(isolate); |
| |
| if (!Compiler::Analyze(parse_info)) return MaybeHandle<SharedFunctionInfo>(); |
| DeclarationScope::AllocateScopeInfos(parse_info, isolate); |
| |
| // Prepare and execute compilation of the outer-most function. |
| // Create the SharedFunctionInfo and add it to the script's list. |
| Handle<Script> script = parse_info->script(); |
| Handle<SharedFunctionInfo> top_level = |
| isolate->factory()->NewSharedFunctionInfoForLiteral(parse_info->literal(), |
| script, true); |
| |
| std::vector<FunctionLiteral*> functions_to_compile; |
| functions_to_compile.push_back(parse_info->literal()); |
| |
| while (!functions_to_compile.empty()) { |
| FunctionLiteral* literal = functions_to_compile.back(); |
| functions_to_compile.pop_back(); |
| Handle<SharedFunctionInfo> shared_info = |
| Compiler::GetSharedFunctionInfo(literal, script, isolate); |
| if (shared_info->is_compiled()) continue; |
| if (UseAsmWasm(literal, parse_info->is_asm_wasm_broken())) { |
| std::unique_ptr<UnoptimizedCompilationJob> asm_job( |
| AsmJs::NewCompilationJob(parse_info, literal, allocator)); |
| if (asm_job->ExecuteJob() == CompilationJob::SUCCEEDED && |
| FinalizeUnoptimizedCompilationJob(asm_job.get(), shared_info, |
| isolate) == |
| CompilationJob::SUCCEEDED) { |
| continue; |
| } |
| // asm.js validation failed, fall through to standard unoptimized compile. |
| // Note: we rely on the fact that AsmJs jobs have done all validation in |
| // the PrepareJob and ExecuteJob phases and can't fail in FinalizeJob with |
| // with a validation error or another error that could be solve by falling |
| // through to standard unoptimized compile. |
| } |
| |
| std::unique_ptr<UnoptimizedCompilationJob> job( |
| interpreter::Interpreter::NewCompilationJob( |
| parse_info, literal, allocator, &functions_to_compile)); |
| |
| if (job->ExecuteJob() == CompilationJob::FAILED || |
| FinalizeUnoptimizedCompilationJob(job.get(), shared_info, isolate) == |
| CompilationJob::FAILED) { |
| return MaybeHandle<SharedFunctionInfo>(); |
| } |
| |
| if (FLAG_stress_lazy_source_positions) { |
| // Collect source positions immediately to try and flush out bytecode |
| // mismatches. |
| SharedFunctionInfo::EnsureSourcePositionsAvailable(isolate, shared_info); |
| } |
| |
| if (shared_info.is_identical_to(top_level)) { |
| // Ensure that the top level function is retained. |
| *is_compiled_scope = shared_info->is_compiled_scope(); |
| DCHECK(is_compiled_scope->is_compiled()); |
| } |
| } |
| |
| // Character stream shouldn't be used again. |
| parse_info->ResetCharacterStream(); |
| |
| return top_level; |
| } |
| |
| bool FinalizeUnoptimizedCode( |
| ParseInfo* parse_info, Isolate* isolate, |
| Handle<SharedFunctionInfo> shared_info, |
| UnoptimizedCompilationJob* outer_function_job, |
| UnoptimizedCompilationJobList* inner_function_jobs) { |
| DCHECK(AllowCompilation::IsAllowed(isolate)); |
| |
| // TODO(rmcilroy): Clear native context in debug once AsmJS generates doesn't |
| // rely on accessing native context during finalization. |
| |
| // Allocate scope infos for the literal. |
| DeclarationScope::AllocateScopeInfos(parse_info, isolate); |
| |
| // Finalize the outer-most function's compilation job. |
| if (FinalizeUnoptimizedCompilationJob(outer_function_job, shared_info, |
| isolate) != CompilationJob::SUCCEEDED) { |
| return false; |
| } |
| |
| // Finalize the inner functions' compilation jobs. |
| for (auto&& inner_job : *inner_function_jobs) { |
| Handle<SharedFunctionInfo> inner_shared_info = |
| Compiler::GetSharedFunctionInfo( |
| inner_job->compilation_info()->literal(), parse_info->script(), |
| isolate); |
| // The inner function might be compiled already if compiling for debug. |
| if (inner_shared_info->is_compiled()) continue; |
| if (FinalizeUnoptimizedCompilationJob(inner_job.get(), inner_shared_info, |
| isolate) != |
| CompilationJob::SUCCEEDED) { |
| return false; |
| } |
| } |
| |
| // Report any warnings generated during compilation. |
| if (parse_info->pending_error_handler()->has_pending_warnings()) { |
| parse_info->pending_error_handler()->ReportWarnings(isolate, |
| parse_info->script()); |
| } |
| |
| return true; |
| } |
| |
| V8_WARN_UNUSED_RESULT MaybeHandle<Code> GetCodeFromOptimizedCodeCache( |
| Handle<JSFunction> function, BailoutId osr_offset) { |
| RuntimeCallTimerScope runtimeTimer( |
| function->GetIsolate(), |
| RuntimeCallCounterId::kCompileGetFromOptimizedCodeMap); |
| Handle<SharedFunctionInfo> shared(function->shared(), function->GetIsolate()); |
| DisallowHeapAllocation no_gc; |
| if (osr_offset.IsNone()) { |
| if (function->has_feedback_vector()) { |
| FeedbackVector feedback_vector = function->feedback_vector(); |
| feedback_vector.EvictOptimizedCodeMarkedForDeoptimization( |
| function->shared(), "GetCodeFromOptimizedCodeCache"); |
| Code code = feedback_vector.optimized_code(); |
| |
| if (!code.is_null()) { |
| // Caching of optimized code enabled and optimized code found. |
| DCHECK(!code.marked_for_deoptimization()); |
| DCHECK(function->shared().is_compiled()); |
| return Handle<Code>(code, feedback_vector.GetIsolate()); |
| } |
| } |
| } |
| return MaybeHandle<Code>(); |
| } |
| |
| void ClearOptimizedCodeCache(OptimizedCompilationInfo* compilation_info) { |
| Handle<JSFunction> function = compilation_info->closure(); |
| if (compilation_info->osr_offset().IsNone()) { |
| Handle<FeedbackVector> vector = |
| handle(function->feedback_vector(), function->GetIsolate()); |
| vector->ClearOptimizationMarker(); |
| } |
| } |
| |
| void InsertCodeIntoOptimizedCodeCache( |
| OptimizedCompilationInfo* compilation_info) { |
| Handle<Code> code = compilation_info->code(); |
| if (code->kind() != Code::OPTIMIZED_FUNCTION) return; // Nothing to do. |
| |
| // Function context specialization folds-in the function context, |
| // so no sharing can occur. |
| if (compilation_info->is_function_context_specializing()) { |
| // Native context specialized code is not shared, so make sure the optimized |
| // code cache is clear. |
| ClearOptimizedCodeCache(compilation_info); |
| return; |
| } |
| |
| // Cache optimized context-specific code. |
| Handle<JSFunction> function = compilation_info->closure(); |
| Handle<SharedFunctionInfo> shared(function->shared(), function->GetIsolate()); |
| Handle<Context> native_context(function->context().native_context(), |
| function->GetIsolate()); |
| if (compilation_info->osr_offset().IsNone()) { |
| Handle<FeedbackVector> vector = |
| handle(function->feedback_vector(), function->GetIsolate()); |
| FeedbackVector::SetOptimizedCode(vector, code); |
| } |
| } |
| |
| bool GetOptimizedCodeNow(OptimizedCompilationJob* job, Isolate* isolate) { |
| TimerEventScope<TimerEventRecompileSynchronous> timer(isolate); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, RuntimeCallCounterId::kRecompileSynchronous); |
| OptimizedCompilationInfo* compilation_info = job->compilation_info(); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.RecompileSynchronous"); |
| |
| if (job->PrepareJob(isolate) != CompilationJob::SUCCEEDED || |
| job->ExecuteJob() != CompilationJob::SUCCEEDED || |
| job->FinalizeJob(isolate) != CompilationJob::SUCCEEDED) { |
| if (FLAG_trace_opt) { |
| PrintF("[aborted optimizing "); |
| compilation_info->closure()->ShortPrint(); |
| PrintF(" because: %s]\n", |
| GetBailoutReason(compilation_info->bailout_reason())); |
| } |
| return false; |
| } |
| |
| // Success! |
| job->RecordCompilationStats(OptimizedCompilationJob::kSynchronous, isolate); |
| DCHECK(!isolate->has_pending_exception()); |
| InsertCodeIntoOptimizedCodeCache(compilation_info); |
| job->RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG, isolate); |
| return true; |
| } |
| |
| bool GetOptimizedCodeLater(OptimizedCompilationJob* job, Isolate* isolate) { |
| OptimizedCompilationInfo* compilation_info = job->compilation_info(); |
| if (!isolate->optimizing_compile_dispatcher()->IsQueueAvailable()) { |
| if (FLAG_trace_concurrent_recompilation) { |
| PrintF(" ** Compilation queue full, will retry optimizing "); |
| compilation_info->closure()->ShortPrint(); |
| PrintF(" later.\n"); |
| } |
| return false; |
| } |
| |
| if (isolate->heap()->HighMemoryPressure()) { |
| if (FLAG_trace_concurrent_recompilation) { |
| PrintF(" ** High memory pressure, will retry optimizing "); |
| compilation_info->closure()->ShortPrint(); |
| PrintF(" later.\n"); |
| } |
| return false; |
| } |
| |
| TimerEventScope<TimerEventRecompileSynchronous> timer(isolate); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, RuntimeCallCounterId::kRecompileSynchronous); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.RecompileSynchronous"); |
| |
| if (job->PrepareJob(isolate) != CompilationJob::SUCCEEDED) return false; |
| isolate->optimizing_compile_dispatcher()->QueueForOptimization(job); |
| |
| if (FLAG_trace_concurrent_recompilation) { |
| PrintF(" ** Queued "); |
| compilation_info->closure()->ShortPrint(); |
| PrintF(" for concurrent optimization.\n"); |
| } |
| return true; |
| } |
| |
| MaybeHandle<Code> GetOptimizedCode(Handle<JSFunction> function, |
| ConcurrencyMode mode, |
| BailoutId osr_offset = BailoutId::None(), |
| JavaScriptFrame* osr_frame = nullptr) { |
| Isolate* isolate = function->GetIsolate(); |
| Handle<SharedFunctionInfo> shared(function->shared(), isolate); |
| |
| // Make sure we clear the optimization marker on the function so that we |
| // don't try to re-optimize. |
| if (function->HasOptimizationMarker()) { |
| function->ClearOptimizationMarker(); |
| } |
| |
| if (shared->optimization_disabled() && |
| shared->disable_optimization_reason() == BailoutReason::kNeverOptimize) { |
| return MaybeHandle<Code>(); |
| } |
| |
| if (isolate->debug()->needs_check_on_function_call()) { |
| // Do not optimize when debugger needs to hook into every call. |
| return MaybeHandle<Code>(); |
| } |
| |
| // If code was pending optimization for testing, delete remove the entry |
| // from the table that was preventing the bytecode from being flushed |
| if (V8_UNLIKELY(FLAG_testing_d8_test_runner)) { |
| PendingOptimizationTable::FunctionWasOptimized(isolate, function); |
| } |
| |
| Handle<Code> cached_code; |
| if (GetCodeFromOptimizedCodeCache(function, osr_offset) |
| .ToHandle(&cached_code)) { |
| if (FLAG_trace_opt) { |
| PrintF("[found optimized code for "); |
| function->ShortPrint(); |
| if (!osr_offset.IsNone()) { |
| PrintF(" at OSR AST id %d", osr_offset.ToInt()); |
| } |
| PrintF("]\n"); |
| } |
| return cached_code; |
| } |
| |
| // Reset profiler ticks, function is no longer considered hot. |
| DCHECK(shared->is_compiled()); |
| function->feedback_vector().set_profiler_ticks(0); |
| |
| VMState<COMPILER> state(isolate); |
| TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate); |
| RuntimeCallTimerScope runtimeTimer(isolate, |
| RuntimeCallCounterId::kOptimizeCode); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.OptimizeCode"); |
| |
| DCHECK(!isolate->has_pending_exception()); |
| PostponeInterruptsScope postpone(isolate); |
| bool has_script = shared->script().IsScript(); |
| // BUG(5946): This DCHECK is necessary to make certain that we won't |
| // tolerate the lack of a script without bytecode. |
| DCHECK_IMPLIES(!has_script, shared->HasBytecodeArray()); |
| std::unique_ptr<OptimizedCompilationJob> job( |
| compiler::Pipeline::NewCompilationJob(isolate, function, has_script)); |
| OptimizedCompilationInfo* compilation_info = job->compilation_info(); |
| |
| compilation_info->SetOptimizingForOsr(osr_offset, osr_frame); |
| |
| // Do not use TurboFan if we need to be able to set break points. |
| if (compilation_info->shared_info()->HasBreakInfo()) { |
| compilation_info->AbortOptimization(BailoutReason::kFunctionBeingDebugged); |
| return MaybeHandle<Code>(); |
| } |
| |
| // Do not use TurboFan if optimization is disabled or function doesn't pass |
| // turbo_filter. |
| if (!FLAG_opt || !shared->PassesFilter(FLAG_turbo_filter)) { |
| compilation_info->AbortOptimization(BailoutReason::kOptimizationDisabled); |
| return MaybeHandle<Code>(); |
| } |
| |
| // In case of concurrent recompilation, all handles below this point will be |
| // allocated in a deferred handle scope that is detached and handed off to |
| // the background thread when we return. |
| base::Optional<CompilationHandleScope> compilation; |
| if (mode == ConcurrencyMode::kConcurrent) { |
| compilation.emplace(isolate, compilation_info); |
| } |
| |
| // All handles below will be canonicalized. |
| CanonicalHandleScope canonical(isolate); |
| |
| // Reopen handles in the new CompilationHandleScope. |
| compilation_info->ReopenHandlesInNewHandleScope(isolate); |
| |
| if (mode == ConcurrencyMode::kConcurrent) { |
| if (GetOptimizedCodeLater(job.get(), isolate)) { |
| job.release(); // The background recompile job owns this now. |
| |
| // Set the optimization marker and return a code object which checks it. |
| function->SetOptimizationMarker(OptimizationMarker::kInOptimizationQueue); |
| DCHECK(function->IsInterpreted() || |
| (!function->is_compiled() && function->shared().IsInterpreted())); |
| DCHECK(function->shared().HasBytecodeArray()); |
| return BUILTIN_CODE(isolate, InterpreterEntryTrampoline); |
| } |
| } else { |
| if (GetOptimizedCodeNow(job.get(), isolate)) |
| return compilation_info->code(); |
| } |
| |
| if (isolate->has_pending_exception()) isolate->clear_pending_exception(); |
| return MaybeHandle<Code>(); |
| } |
| |
| bool FailWithPendingException(Isolate* isolate, ParseInfo* parse_info, |
| Compiler::ClearExceptionFlag flag) { |
| if (flag == Compiler::CLEAR_EXCEPTION) { |
| isolate->clear_pending_exception(); |
| } else if (!isolate->has_pending_exception()) { |
| if (parse_info->pending_error_handler()->has_pending_error()) { |
| parse_info->pending_error_handler()->ReportErrors( |
| isolate, parse_info->script(), parse_info->ast_value_factory()); |
| } else { |
| isolate->StackOverflow(); |
| } |
| } |
| return false; |
| } |
| |
| void FinalizeScriptCompilation(Isolate* isolate, ParseInfo* parse_info) { |
| Handle<Script> script = parse_info->script(); |
| script->set_compilation_state(Script::COMPILATION_STATE_COMPILED); |
| |
| // Register any pending parallel tasks with the associated SFI. |
| if (parse_info->parallel_tasks()) { |
| CompilerDispatcher* dispatcher = parse_info->parallel_tasks()->dispatcher(); |
| for (auto& it : *parse_info->parallel_tasks()) { |
| FunctionLiteral* literal = it.first; |
| CompilerDispatcher::JobId job_id = it.second; |
| MaybeHandle<SharedFunctionInfo> maybe_shared_for_task = |
| script->FindSharedFunctionInfo(isolate, literal); |
| Handle<SharedFunctionInfo> shared_for_task; |
| if (maybe_shared_for_task.ToHandle(&shared_for_task)) { |
| dispatcher->RegisterSharedFunctionInfo(job_id, *shared_for_task); |
| } else { |
| dispatcher->AbortJob(job_id); |
| } |
| } |
| } |
| } |
| |
| MaybeHandle<SharedFunctionInfo> FinalizeTopLevel( |
| ParseInfo* parse_info, Isolate* isolate, |
| UnoptimizedCompilationJob* outer_function_job, |
| UnoptimizedCompilationJobList* inner_function_jobs) { |
| // Internalize ast values onto the heap. |
| parse_info->ast_value_factory()->Internalize(isolate); |
| |
| // Create shared function infos for top level and shared function infos array |
| // for inner functions. |
| EnsureSharedFunctionInfosArrayOnScript(parse_info, isolate); |
| DCHECK_EQ(kNoSourcePosition, |
| parse_info->literal()->function_token_position()); |
| Handle<SharedFunctionInfo> shared_info = |
| isolate->factory()->NewSharedFunctionInfoForLiteral( |
| parse_info->literal(), parse_info->script(), true); |
| |
| // Finalize compilation of the unoptimized bytecode or asm-js data. |
| if (!FinalizeUnoptimizedCode(parse_info, isolate, shared_info, |
| outer_function_job, inner_function_jobs)) { |
| FailWithPendingException(isolate, parse_info, |
| Compiler::ClearExceptionFlag::KEEP_EXCEPTION); |
| return MaybeHandle<SharedFunctionInfo>(); |
| } |
| |
| FinalizeScriptCompilation(isolate, parse_info); |
| |
| return shared_info; |
| } |
| |
| MaybeHandle<SharedFunctionInfo> CompileToplevel( |
| ParseInfo* parse_info, Isolate* isolate, |
| IsCompiledScope* is_compiled_scope) { |
| TimerEventScope<TimerEventCompileCode> top_level_timer(isolate); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileCode"); |
| DCHECK_EQ(ThreadId::Current(), isolate->thread_id()); |
| |
| PostponeInterruptsScope postpone(isolate); |
| DCHECK(!isolate->native_context().is_null()); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, parse_info->is_eval() ? RuntimeCallCounterId::kCompileEval |
| : RuntimeCallCounterId::kCompileScript); |
| VMState<BYTECODE_COMPILER> state(isolate); |
| if (parse_info->literal() == nullptr && |
| !parsing::ParseProgram(parse_info, isolate)) { |
| return MaybeHandle<SharedFunctionInfo>(); |
| } |
| // Measure how long it takes to do the compilation; only take the |
| // rest of the function into account to avoid overlap with the |
| // parsing statistics. |
| HistogramTimer* rate = parse_info->is_eval() |
| ? isolate->counters()->compile_eval() |
| : isolate->counters()->compile(); |
| HistogramTimerScope timer(rate); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| parse_info->is_eval() ? "V8.CompileEval" : "V8.Compile"); |
| |
| // Generate the unoptimized bytecode or asm-js data. |
| MaybeHandle<SharedFunctionInfo> shared_info = |
| GenerateUnoptimizedCodeForToplevel( |
| isolate, parse_info, isolate->allocator(), is_compiled_scope); |
| if (shared_info.is_null()) { |
| FailWithPendingException(isolate, parse_info, |
| Compiler::ClearExceptionFlag::KEEP_EXCEPTION); |
| return MaybeHandle<SharedFunctionInfo>(); |
| } |
| |
| FinalizeScriptCompilation(isolate, parse_info); |
| return shared_info; |
| } |
| |
| std::unique_ptr<UnoptimizedCompilationJob> CompileOnBackgroundThread( |
| ParseInfo* parse_info, AccountingAllocator* allocator, |
| UnoptimizedCompilationJobList* inner_function_jobs) { |
| DisallowHeapAccess no_heap_access; |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.CompileCodeBackground"); |
| RuntimeCallTimerScope runtimeTimer( |
| parse_info->runtime_call_stats(), |
| parse_info->is_toplevel() |
| ? parse_info->is_eval() |
| ? RuntimeCallCounterId::kCompileBackgroundEval |
| : RuntimeCallCounterId::kCompileBackgroundScript |
| : RuntimeCallCounterId::kCompileBackgroundFunction); |
| |
| // Generate the unoptimized bytecode or asm-js data. |
| std::unique_ptr<UnoptimizedCompilationJob> outer_function_job( |
| GenerateUnoptimizedCode(parse_info, allocator, inner_function_jobs)); |
| return outer_function_job; |
| } |
| |
| } // namespace |
| |
| BackgroundCompileTask::BackgroundCompileTask(ScriptStreamingData* streamed_data, |
| Isolate* isolate) |
| : info_(new ParseInfo(isolate)), |
| stack_size_(i::FLAG_stack_size), |
| worker_thread_runtime_call_stats_( |
| isolate->counters()->worker_thread_runtime_call_stats()), |
| allocator_(isolate->allocator()), |
| timer_(isolate->counters()->compile_script_on_background()) { |
| VMState<PARSER> state(isolate); |
| |
| // Prepare the data for the internalization phase and compilation phase, which |
| // will happen in the main thread after parsing. |
| LOG(isolate, ScriptEvent(Logger::ScriptEventType::kStreamingCompile, |
| info_->script_id())); |
| info_->set_toplevel(); |
| info_->set_allow_lazy_parsing(); |
| if (V8_UNLIKELY(info_->block_coverage_enabled())) { |
| info_->AllocateSourceRangeMap(); |
| } |
| LanguageMode language_mode = construct_language_mode(FLAG_use_strict); |
| info_->set_language_mode( |
| stricter_language_mode(info_->language_mode(), language_mode)); |
| |
| std::unique_ptr<Utf16CharacterStream> stream(ScannerStream::For( |
| streamed_data->source_stream.get(), streamed_data->encoding)); |
| info_->set_character_stream(std::move(stream)); |
| } |
| |
| BackgroundCompileTask::BackgroundCompileTask( |
| AccountingAllocator* allocator, const ParseInfo* outer_parse_info, |
| const AstRawString* function_name, const FunctionLiteral* function_literal, |
| WorkerThreadRuntimeCallStats* worker_thread_runtime_stats, |
| TimedHistogram* timer, int max_stack_size) |
| : info_(ParseInfo::FromParent(outer_parse_info, allocator, function_literal, |
| function_name)), |
| stack_size_(max_stack_size), |
| worker_thread_runtime_call_stats_(worker_thread_runtime_stats), |
| allocator_(allocator), |
| timer_(timer) { |
| DCHECK(outer_parse_info->is_toplevel()); |
| DCHECK(!function_literal->is_toplevel()); |
| |
| // Clone the character stream so both can be accessed independently. |
| std::unique_ptr<Utf16CharacterStream> character_stream = |
| outer_parse_info->character_stream()->Clone(); |
| character_stream->Seek(function_literal->start_position()); |
| info_->set_character_stream(std::move(character_stream)); |
| |
| // Get preparsed scope data from the function literal. |
| if (function_literal->produced_preparse_data()) { |
| ZonePreparseData* serialized_data = |
| function_literal->produced_preparse_data()->Serialize(info_->zone()); |
| info_->set_consumed_preparse_data( |
| ConsumedPreparseData::For(info_->zone(), serialized_data)); |
| } |
| } |
| |
| BackgroundCompileTask::~BackgroundCompileTask() = default; |
| |
| namespace { |
| |
| // A scope object that ensures a parse info's runtime call stats, stack limit |
| // and on_background_thread fields is set correctly during worker-thread |
| // compile, and restores it after going out of scope. |
| class OffThreadParseInfoScope { |
| public: |
| OffThreadParseInfoScope( |
| ParseInfo* parse_info, |
| WorkerThreadRuntimeCallStats* worker_thread_runtime_stats, int stack_size) |
| : parse_info_(parse_info), |
| original_runtime_call_stats_(parse_info_->runtime_call_stats()), |
| original_stack_limit_(parse_info_->stack_limit()), |
| worker_thread_scope_(worker_thread_runtime_stats) { |
| parse_info_->set_on_background_thread(true); |
| parse_info_->set_runtime_call_stats(worker_thread_scope_.Get()); |
| parse_info_->set_stack_limit(GetCurrentStackPosition() - stack_size * KB); |
| } |
| |
| ~OffThreadParseInfoScope() { |
| parse_info_->set_stack_limit(original_stack_limit_); |
| parse_info_->set_runtime_call_stats(original_runtime_call_stats_); |
| parse_info_->set_on_background_thread(false); |
| } |
| |
| private: |
| ParseInfo* parse_info_; |
| RuntimeCallStats* original_runtime_call_stats_; |
| uintptr_t original_stack_limit_; |
| WorkerThreadRuntimeCallStatsScope worker_thread_scope_; |
| |
| DISALLOW_COPY_AND_ASSIGN(OffThreadParseInfoScope); |
| }; |
| |
| } // namespace |
| |
| void BackgroundCompileTask::Run() { |
| DisallowHeapAllocation no_allocation; |
| DisallowHandleAllocation no_handles; |
| DisallowHeapAccess no_heap_access; |
| |
| TimedHistogramScope timer(timer_); |
| OffThreadParseInfoScope off_thread_scope( |
| info_.get(), worker_thread_runtime_call_stats_, stack_size_); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "BackgroundCompileTask::Run"); |
| RuntimeCallTimerScope runtimeTimer( |
| info_->runtime_call_stats(), |
| RuntimeCallCounterId::kCompileBackgroundCompileTask); |
| |
| // Update the character stream's runtime call stats. |
| info_->character_stream()->set_runtime_call_stats( |
| info_->runtime_call_stats()); |
| |
| // Parser needs to stay alive for finalizing the parsing on the main |
| // thread. |
| parser_.reset(new Parser(info_.get())); |
| parser_->InitializeEmptyScopeChain(info_.get()); |
| |
| parser_->ParseOnBackground(info_.get()); |
| if (info_->literal() != nullptr) { |
| // Parsing has succeeded, compile. |
| outer_function_job_ = CompileOnBackgroundThread(info_.get(), allocator_, |
| &inner_function_jobs_); |
| } |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation of Compiler |
| |
| bool Compiler::Analyze(ParseInfo* parse_info) { |
| DCHECK_NOT_NULL(parse_info->literal()); |
| RuntimeCallTimerScope runtimeTimer( |
| parse_info->runtime_call_stats(), |
| parse_info->on_background_thread() |
| ? RuntimeCallCounterId::kCompileBackgroundAnalyse |
| : RuntimeCallCounterId::kCompileAnalyse); |
| if (!Rewriter::Rewrite(parse_info)) return false; |
| if (!DeclarationScope::Analyze(parse_info)) return false; |
| return true; |
| } |
| |
| bool Compiler::ParseAndAnalyze(ParseInfo* parse_info, |
| Handle<SharedFunctionInfo> shared_info, |
| Isolate* isolate) { |
| if (!parsing::ParseAny(parse_info, shared_info, isolate)) { |
| return false; |
| } |
| return Compiler::Analyze(parse_info); |
| } |
| |
| // static |
| bool Compiler::CollectSourcePositions(Isolate* isolate, |
| Handle<SharedFunctionInfo> shared_info) { |
| DCHECK(shared_info->is_compiled()); |
| DCHECK(shared_info->HasBytecodeArray()); |
| DCHECK(!shared_info->GetBytecodeArray().HasSourcePositionTable()); |
| |
| // Collecting source positions requires allocating a new source position |
| // table. |
| DCHECK(AllowHeapAllocation::IsAllowed()); |
| |
| Handle<BytecodeArray> bytecode = |
| handle(shared_info->GetBytecodeArray(), isolate); |
| |
| // TODO(v8:8510): Push the CLEAR_EXCEPTION flag or something like it down into |
| // the parser so it aborts without setting a pending exception, which then |
| // gets thrown. This would avoid the situation where potentially we'd reparse |
| // several times (running out of stack each time) before hitting this limit. |
| if (GetCurrentStackPosition() < isolate->stack_guard()->real_climit()) { |
| // Stack is already exhausted. |
| bytecode->SetSourcePositionsFailedToCollect(); |
| return false; |
| } |
| |
| DCHECK(AllowCompilation::IsAllowed(isolate)); |
| DCHECK_EQ(ThreadId::Current(), isolate->thread_id()); |
| DCHECK(!isolate->has_pending_exception()); |
| VMState<BYTECODE_COMPILER> state(isolate); |
| PostponeInterruptsScope postpone(isolate); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, RuntimeCallCounterId::kCompileCollectSourcePositions); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.CollectSourcePositions"); |
| HistogramTimerScope timer(isolate->counters()->collect_source_positions()); |
| |
| // Set up parse info. |
| ParseInfo parse_info(isolate, shared_info); |
| parse_info.set_lazy_compile(); |
| parse_info.set_collect_source_positions(); |
| if (FLAG_allow_natives_syntax) parse_info.set_allow_natives_syntax(); |
| |
| // Parse and update ParseInfo with the results. |
| if (!parsing::ParseAny(&parse_info, shared_info, isolate)) { |
| // Parsing failed probably as a result of stack exhaustion. |
| bytecode->SetSourcePositionsFailedToCollect(); |
| return FailWithPendingException( |
| isolate, &parse_info, Compiler::ClearExceptionFlag::CLEAR_EXCEPTION); |
| } |
| |
| // Generate the unoptimized bytecode. |
| // TODO(v8:8510): Consider forcing preparsing of inner functions to avoid |
| // wasting time fully parsing them when they won't ever be used. |
| UnoptimizedCompilationJobList inner_function_jobs; |
| std::unique_ptr<UnoptimizedCompilationJob> outer_function_job( |
| GenerateUnoptimizedCode(&parse_info, isolate->allocator(), |
| &inner_function_jobs)); |
| if (!outer_function_job) { |
| // Recompiling failed probably as a result of stack exhaustion. |
| bytecode->SetSourcePositionsFailedToCollect(); |
| return FailWithPendingException( |
| isolate, &parse_info, Compiler::ClearExceptionFlag::CLEAR_EXCEPTION); |
| } |
| |
| DCHECK(outer_function_job->compilation_info()->collect_source_positions()); |
| |
| // TODO(v8:8510) Avoid re-allocating bytecode array/constant pool and |
| // re-internalizeing the ast values. Maybe we could use the |
| // unoptimized_compilation_flag to signal that all we need is the source |
| // position table (and we could do the DCHECK that the bytecode array is the |
| // same in the bytecode-generator, by comparing the real bytecode array on the |
| // SFI with the off-heap bytecode array). |
| |
| // Internalize ast values onto the heap. |
| parse_info.ast_value_factory()->Internalize(isolate); |
| |
| { |
| // Allocate scope infos for the literal. |
| DeclarationScope::AllocateScopeInfos(&parse_info, isolate); |
| CHECK_EQ(outer_function_job->FinalizeJob(shared_info, isolate), |
| CompilationJob::SUCCEEDED); |
| } |
| |
| // Update the source position table on the original bytecode. |
| DCHECK(bytecode->IsBytecodeEqual( |
| *outer_function_job->compilation_info()->bytecode_array())); |
| DCHECK(outer_function_job->compilation_info()->has_bytecode_array()); |
| ByteArray source_position_table = outer_function_job->compilation_info() |
| ->bytecode_array() |
| ->SourcePositionTable(); |
| bytecode->set_source_position_table(source_position_table); |
| // If debugging, make sure that instrumented bytecode has the source position |
| // table set on it as well. |
| if (shared_info->HasDebugInfo() && |
| shared_info->GetDebugInfo().HasInstrumentedBytecodeArray()) { |
| shared_info->GetDebugBytecodeArray().set_source_position_table( |
| source_position_table); |
| } |
| |
| DCHECK(!isolate->has_pending_exception()); |
| DCHECK(shared_info->is_compiled_scope().is_compiled()); |
| return true; |
| } |
| |
| bool Compiler::Compile(Handle<SharedFunctionInfo> shared_info, |
| ClearExceptionFlag flag, |
| IsCompiledScope* is_compiled_scope) { |
| // We should never reach here if the function is already compiled. |
| DCHECK(!shared_info->is_compiled()); |
| DCHECK(!is_compiled_scope->is_compiled()); |
| |
| Isolate* isolate = shared_info->GetIsolate(); |
| DCHECK(AllowCompilation::IsAllowed(isolate)); |
| DCHECK_EQ(ThreadId::Current(), isolate->thread_id()); |
| DCHECK(!isolate->has_pending_exception()); |
| DCHECK(!shared_info->HasBytecodeArray()); |
| VMState<BYTECODE_COMPILER> state(isolate); |
| PostponeInterruptsScope postpone(isolate); |
| TimerEventScope<TimerEventCompileCode> compile_timer(isolate); |
| RuntimeCallTimerScope runtimeTimer(isolate, |
| RuntimeCallCounterId::kCompileFunction); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileCode"); |
| AggregatedHistogramTimerScope timer(isolate->counters()->compile_lazy()); |
| |
| // Set up parse info. |
| ParseInfo parse_info(isolate, shared_info); |
| parse_info.set_lazy_compile(); |
| |
| // Check if the compiler dispatcher has shared_info enqueued for compile. |
| CompilerDispatcher* dispatcher = isolate->compiler_dispatcher(); |
| if (dispatcher->IsEnqueued(shared_info)) { |
| if (!dispatcher->FinishNow(shared_info)) { |
| return FailWithPendingException(isolate, &parse_info, flag); |
| } |
| *is_compiled_scope = shared_info->is_compiled_scope(); |
| DCHECK(is_compiled_scope->is_compiled()); |
| return true; |
| } |
| |
| if (shared_info->HasUncompiledDataWithPreparseData()) { |
| parse_info.set_consumed_preparse_data(ConsumedPreparseData::For( |
| isolate, |
| handle( |
| shared_info->uncompiled_data_with_preparse_data().preparse_data(), |
| isolate))); |
| } |
| |
| // Parse and update ParseInfo with the results. |
| if (!parsing::ParseAny(&parse_info, shared_info, isolate)) { |
| return FailWithPendingException(isolate, &parse_info, flag); |
| } |
| |
| // Generate the unoptimized bytecode or asm-js data. |
| UnoptimizedCompilationJobList inner_function_jobs; |
| std::unique_ptr<UnoptimizedCompilationJob> outer_function_job( |
| GenerateUnoptimizedCode(&parse_info, isolate->allocator(), |
| &inner_function_jobs)); |
| if (!outer_function_job) { |
| return FailWithPendingException(isolate, &parse_info, flag); |
| } |
| |
| // Internalize ast values onto the heap. |
| parse_info.ast_value_factory()->Internalize(isolate); |
| |
| // Finalize compilation of the unoptimized bytecode or asm-js data. |
| if (!FinalizeUnoptimizedCode(&parse_info, isolate, shared_info, |
| outer_function_job.get(), |
| &inner_function_jobs)) { |
| return FailWithPendingException(isolate, &parse_info, flag); |
| } |
| |
| DCHECK(!isolate->has_pending_exception()); |
| *is_compiled_scope = shared_info->is_compiled_scope(); |
| DCHECK(is_compiled_scope->is_compiled()); |
| |
| if (FLAG_stress_lazy_source_positions) { |
| // Collect source positions immediately to try and flush out bytecode |
| // mismatches. |
| SharedFunctionInfo::EnsureSourcePositionsAvailable(isolate, shared_info); |
| } |
| |
| return true; |
| } |
| |
| bool Compiler::Compile(Handle<JSFunction> function, ClearExceptionFlag flag, |
| IsCompiledScope* is_compiled_scope) { |
| // We should never reach here if the function is already compiled or optimized |
| DCHECK(!function->is_compiled()); |
| DCHECK(!function->IsOptimized()); |
| DCHECK(!function->HasOptimizationMarker()); |
| DCHECK(!function->HasOptimizedCode()); |
| |
| // Reset the JSFunction if we are recompiling due to the bytecode having been |
| // flushed. |
| function->ResetIfBytecodeFlushed(); |
| |
| Isolate* isolate = function->GetIsolate(); |
| Handle<SharedFunctionInfo> shared_info = handle(function->shared(), isolate); |
| |
| // Ensure shared function info is compiled. |
| *is_compiled_scope = shared_info->is_compiled_scope(); |
| if (!is_compiled_scope->is_compiled() && |
| !Compile(shared_info, flag, is_compiled_scope)) { |
| return false; |
| } |
| DCHECK(is_compiled_scope->is_compiled()); |
| Handle<Code> code = handle(shared_info->GetCode(), isolate); |
| |
| // Initialize the feedback cell for this JSFunction. |
| JSFunction::InitializeFeedbackCell(function); |
| |
| // Optimize now if --always-opt is enabled. |
| if (FLAG_always_opt && !function->shared().HasAsmWasmData()) { |
| if (FLAG_trace_opt) { |
| PrintF("[optimizing "); |
| function->ShortPrint(); |
| PrintF(" because --always-opt]\n"); |
| } |
| Handle<Code> opt_code; |
| if (GetOptimizedCode(function, ConcurrencyMode::kNotConcurrent) |
| .ToHandle(&opt_code)) { |
| code = opt_code; |
| } |
| } |
| |
| // Install code on closure. |
| function->set_code(*code); |
| |
| // Check postconditions on success. |
| DCHECK(!isolate->has_pending_exception()); |
| DCHECK(function->shared().is_compiled()); |
| DCHECK(function->is_compiled()); |
| return true; |
| } |
| |
| bool Compiler::FinalizeBackgroundCompileTask( |
| BackgroundCompileTask* task, Handle<SharedFunctionInfo> shared_info, |
| Isolate* isolate, ClearExceptionFlag flag) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.FinalizeBackgroundCompileTask"); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, RuntimeCallCounterId::kCompileFinalizeBackgroundCompileTask); |
| HandleScope scope(isolate); |
| ParseInfo* parse_info = task->info(); |
| DCHECK(!parse_info->is_toplevel()); |
| DCHECK(!shared_info->is_compiled()); |
| |
| Handle<Script> script(Script::cast(shared_info->script()), isolate); |
| parse_info->set_script(script); |
| |
| task->parser()->UpdateStatistics(isolate, script); |
| task->parser()->HandleSourceURLComments(isolate, script); |
| |
| if (parse_info->literal() == nullptr || !task->outer_function_job()) { |
| // Parsing or compile failed on background thread - report error messages. |
| return FailWithPendingException(isolate, parse_info, flag); |
| } |
| |
| // Parsing has succeeded - finalize compilation. |
| parse_info->ast_value_factory()->Internalize(isolate); |
| if (!FinalizeUnoptimizedCode(parse_info, isolate, shared_info, |
| task->outer_function_job(), |
| task->inner_function_jobs())) { |
| // Finalization failed - throw an exception. |
| return FailWithPendingException(isolate, parse_info, flag); |
| } |
| |
| DCHECK(!isolate->has_pending_exception()); |
| DCHECK(shared_info->is_compiled()); |
| return true; |
| } |
| |
| bool Compiler::CompileOptimized(Handle<JSFunction> function, |
| ConcurrencyMode mode) { |
| if (function->IsOptimized()) return true; |
| Isolate* isolate = function->GetIsolate(); |
| DCHECK(AllowCompilation::IsAllowed(isolate)); |
| |
| // Start a compilation. |
| Handle<Code> code; |
| if (!GetOptimizedCode(function, mode).ToHandle(&code)) { |
| // Optimization failed, get unoptimized code. Unoptimized code must exist |
| // already if we are optimizing. |
| DCHECK(!isolate->has_pending_exception()); |
| DCHECK(function->shared().is_compiled()); |
| DCHECK(function->shared().IsInterpreted()); |
| code = BUILTIN_CODE(isolate, InterpreterEntryTrampoline); |
| } |
| |
| // Install code on closure. |
| function->set_code(*code); |
| |
| // Check postconditions on success. |
| DCHECK(!isolate->has_pending_exception()); |
| DCHECK(function->shared().is_compiled()); |
| DCHECK(function->is_compiled()); |
| DCHECK_IMPLIES(function->HasOptimizationMarker(), |
| function->IsInOptimizationQueue()); |
| DCHECK_IMPLIES(function->HasOptimizationMarker(), |
| function->ChecksOptimizationMarker()); |
| DCHECK_IMPLIES(function->IsInOptimizationQueue(), |
| mode == ConcurrencyMode::kConcurrent); |
| return true; |
| } |
| |
| MaybeHandle<SharedFunctionInfo> Compiler::CompileForLiveEdit( |
| ParseInfo* parse_info, Isolate* isolate) { |
| IsCompiledScope is_compiled_scope; |
| return CompileToplevel(parse_info, isolate, &is_compiled_scope); |
| } |
| |
| MaybeHandle<JSFunction> Compiler::GetFunctionFromEval( |
| Handle<String> source, Handle<SharedFunctionInfo> outer_info, |
| Handle<Context> context, LanguageMode language_mode, |
| ParseRestriction restriction, int parameters_end_pos, |
| int eval_scope_position, int eval_position) { |
| Isolate* isolate = context->GetIsolate(); |
| int source_length = source->length(); |
| isolate->counters()->total_eval_size()->Increment(source_length); |
| isolate->counters()->total_compile_size()->Increment(source_length); |
| |
| // The cache lookup key needs to be aware of the separation between the |
| // parameters and the body to prevent this valid invocation: |
| // Function("", "function anonymous(\n/**/) {\n}"); |
| // from adding an entry that falsely approves this invalid invocation: |
| // Function("\n/**/) {\nfunction anonymous(", "}"); |
| // The actual eval_scope_position for indirect eval and CreateDynamicFunction |
| // is unused (just 0), which means it's an available field to use to indicate |
| // this separation. But to make sure we're not causing other false hits, we |
| // negate the scope position. |
| if (restriction == ONLY_SINGLE_FUNCTION_LITERAL && |
| parameters_end_pos != kNoSourcePosition) { |
| // use the parameters_end_pos as the eval_scope_position in the eval cache. |
| DCHECK_EQ(eval_scope_position, 0); |
| eval_scope_position = -parameters_end_pos; |
| } |
| CompilationCache* compilation_cache = isolate->compilation_cache(); |
| InfoCellPair eval_result = compilation_cache->LookupEval( |
| source, outer_info, context, language_mode, eval_scope_position); |
| Handle<FeedbackCell> feedback_cell; |
| if (eval_result.has_feedback_cell()) { |
| feedback_cell = handle(eval_result.feedback_cell(), isolate); |
| } |
| |
| Handle<SharedFunctionInfo> shared_info; |
| Handle<Script> script; |
| IsCompiledScope is_compiled_scope; |
| bool allow_eval_cache; |
| if (eval_result.has_shared()) { |
| shared_info = Handle<SharedFunctionInfo>(eval_result.shared(), isolate); |
| script = Handle<Script>(Script::cast(shared_info->script()), isolate); |
| is_compiled_scope = shared_info->is_compiled_scope(); |
| allow_eval_cache = true; |
| } else { |
| ParseInfo parse_info(isolate); |
| script = parse_info.CreateScript( |
| isolate, source, OriginOptionsForEval(outer_info->script())); |
| script->set_compilation_type(Script::COMPILATION_TYPE_EVAL); |
| script->set_eval_from_shared(*outer_info); |
| if (eval_position == kNoSourcePosition) { |
| // If the position is missing, attempt to get the code offset by |
| // walking the stack. Do not translate the code offset into source |
| // position, but store it as negative value for lazy translation. |
| StackTraceFrameIterator it(isolate); |
| if (!it.done() && it.is_javascript()) { |
| FrameSummary summary = FrameSummary::GetTop(it.javascript_frame()); |
| script->set_eval_from_shared( |
| summary.AsJavaScript().function()->shared()); |
| script->set_origin_options(OriginOptionsForEval(*summary.script())); |
| eval_position = -summary.code_offset(); |
| } else { |
| eval_position = 0; |
| } |
| } |
| script->set_eval_from_position(eval_position); |
| TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID( |
| TRACE_DISABLED_BY_DEFAULT("v8.compile"), "Script", |
| TRACE_ID_WITH_SCOPE(Script::kTraceScope, script->id()), |
| script->ToTracedValue()); |
| |
| parse_info.set_eval(); |
| parse_info.set_language_mode(language_mode); |
| parse_info.set_parse_restriction(restriction); |
| parse_info.set_parameters_end_pos(parameters_end_pos); |
| if (!context->IsNativeContext()) { |
| parse_info.set_outer_scope_info(handle(context->scope_info(), isolate)); |
| } |
| DCHECK(!parse_info.is_module()); |
| |
| if (!CompileToplevel(&parse_info, isolate, &is_compiled_scope) |
| .ToHandle(&shared_info)) { |
| return MaybeHandle<JSFunction>(); |
| } |
| allow_eval_cache = parse_info.allow_eval_cache(); |
| } |
| |
| // If caller is strict mode, the result must be in strict mode as well. |
| DCHECK(is_sloppy(language_mode) || is_strict(shared_info->language_mode())); |
| |
| Handle<JSFunction> result; |
| if (eval_result.has_shared()) { |
| if (eval_result.has_feedback_cell()) { |
| result = isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| shared_info, context, feedback_cell, AllocationType::kYoung); |
| } else { |
| result = isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| shared_info, context, AllocationType::kYoung); |
| JSFunction::InitializeFeedbackCell(result); |
| if (allow_eval_cache) { |
| // Make sure to cache this result. |
| Handle<FeedbackCell> new_feedback_cell(result->raw_feedback_cell(), |
| isolate); |
| compilation_cache->PutEval(source, outer_info, context, shared_info, |
| new_feedback_cell, eval_scope_position); |
| } |
| } |
| } else { |
| result = isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| shared_info, context, AllocationType::kYoung); |
| JSFunction::InitializeFeedbackCell(result); |
| if (allow_eval_cache) { |
| // Add the SharedFunctionInfo and the LiteralsArray to the eval cache if |
| // we didn't retrieve from there. |
| Handle<FeedbackCell> new_feedback_cell(result->raw_feedback_cell(), |
| isolate); |
| compilation_cache->PutEval(source, outer_info, context, shared_info, |
| new_feedback_cell, eval_scope_position); |
| } |
| } |
| DCHECK(is_compiled_scope.is_compiled()); |
| |
| return result; |
| } |
| |
| // Check whether embedder allows code generation in this context. |
| // (via v8::Isolate::SetAllowCodeGenerationFromStringsCallback) |
| bool CodeGenerationFromStringsAllowed(Isolate* isolate, Handle<Context> context, |
| Handle<String> source) { |
| DCHECK(context->allow_code_gen_from_strings().IsFalse(isolate)); |
| DCHECK(isolate->allow_code_gen_callback()); |
| |
| // Callback set. Let it decide if code generation is allowed. |
| VMState<EXTERNAL> state(isolate); |
| RuntimeCallTimerScope timer( |
| isolate, RuntimeCallCounterId::kCodeGenerationFromStringsCallbacks); |
| AllowCodeGenerationFromStringsCallback callback = |
| isolate->allow_code_gen_callback(); |
| return callback(v8::Utils::ToLocal(context), v8::Utils::ToLocal(source)); |
| } |
| |
| // Check whether embedder allows code generation in this context. |
| // (via v8::Isolate::SetModifyCodeGenerationFromStringsCallback) |
| bool ModifyCodeGenerationFromStrings(Isolate* isolate, Handle<Context> context, |
| Handle<i::Object>* source) { |
| DCHECK(context->allow_code_gen_from_strings().IsFalse(isolate)); |
| DCHECK(isolate->modify_code_gen_callback()); |
| DCHECK(source); |
| |
| // Callback set. Run it, and use the return value as source, or block |
| // execution if it's not set. |
| VMState<EXTERNAL> state(isolate); |
| ModifyCodeGenerationFromStringsCallback modify_callback = |
| isolate->modify_code_gen_callback(); |
| RuntimeCallTimerScope timer( |
| isolate, RuntimeCallCounterId::kCodeGenerationFromStringsCallbacks); |
| MaybeLocal<v8::String> modified_source = |
| modify_callback(v8::Utils::ToLocal(context), v8::Utils::ToLocal(*source)); |
| if (modified_source.IsEmpty()) return false; |
| |
| // Use the new source (which might be the same as the old source) and return. |
| *source = Utils::OpenHandle(*modified_source.ToLocalChecked(), false); |
| return true; |
| } |
| |
| // Run Embedder-mandated checks before generating code from a string. |
| // |
| // Returns a string to be used for compilation, or a flag that an object type |
| // was encountered that is neither a string, nor something the embedder knows |
| // how to handle. |
| // |
| // Returns: (assuming: std::tie(source, unknown_object)) |
| // - !source.is_null(): compilation allowed, source contains the source string. |
| // - unknown_object is true: compilation allowed, but we don't know how to |
| // deal with source_object. |
| // - source.is_null() && !unknown_object: compilation should be blocked. |
| // |
| // - !source_is_null() and unknown_object can't be true at the same time. |
| std::pair<MaybeHandle<String>, bool> Compiler::ValidateDynamicCompilationSource( |
| Isolate* isolate, Handle<Context> context, |
| Handle<i::Object> source_object) { |
| Handle<String> source; |
| if (source_object->IsString()) source = Handle<String>::cast(source_object); |
| |
| // Check if the context unconditionally allows code gen from strings. |
| // allow_code_gen_from_strings can be many things, so we'll always check |
| // against the 'false' literal, so that e.g. undefined and 'true' are treated |
| // the same. |
| if (!context->allow_code_gen_from_strings().IsFalse(isolate)) { |
| return {source, !source_object->IsString()}; |
| } |
| |
| // Check if the context allows code generation for this string. |
| // allow_code_gen_callback only allows proper strings. |
| // (I.e., let allow_code_gen_callback decide, if it has been set.) |
| if (isolate->allow_code_gen_callback()) { |
| if (source_object->IsString() && |
| CodeGenerationFromStringsAllowed(isolate, context, source)) { |
| return {source, !source_object->IsString()}; |
| } |
| } |
| |
| // Check if the context wants to block or modify this source object. |
| // Double-check that we really have a string now. |
| // (Let modify_code_gen_callback decide, if it's been set.) |
| if (isolate->modify_code_gen_callback()) { |
| if (ModifyCodeGenerationFromStrings(isolate, context, &source_object) && |
| source_object->IsString()) |
| return {Handle<String>::cast(source_object), false}; |
| } |
| |
| return {MaybeHandle<String>(), !source_object->IsString()}; |
| } |
| |
| MaybeHandle<JSFunction> Compiler::GetFunctionFromValidatedString( |
| Handle<Context> context, MaybeHandle<String> source, |
| ParseRestriction restriction, int parameters_end_pos) { |
| Isolate* const isolate = context->GetIsolate(); |
| Handle<Context> native_context(context->native_context(), isolate); |
| |
| // Raise an EvalError if we did not receive a string. |
| if (source.is_null()) { |
| Handle<Object> error_message = |
| native_context->ErrorMessageForCodeGenerationFromStrings(); |
| THROW_NEW_ERROR( |
| isolate, |
| NewEvalError(MessageTemplate::kCodeGenFromStrings, error_message), |
| JSFunction); |
| } |
| |
| // Compile source string in the native context. |
| int eval_scope_position = 0; |
| int eval_position = kNoSourcePosition; |
| Handle<SharedFunctionInfo> outer_info( |
| native_context->empty_function().shared(), isolate); |
| return Compiler::GetFunctionFromEval(source.ToHandleChecked(), outer_info, |
| native_context, LanguageMode::kSloppy, |
| restriction, parameters_end_pos, |
| eval_scope_position, eval_position); |
| } |
| |
| MaybeHandle<JSFunction> Compiler::GetFunctionFromString( |
| Handle<Context> context, Handle<Object> source, |
| ParseRestriction restriction, int parameters_end_pos) { |
| Isolate* const isolate = context->GetIsolate(); |
| Handle<Context> native_context(context->native_context(), isolate); |
| return GetFunctionFromValidatedString( |
| context, ValidateDynamicCompilationSource(isolate, context, source).first, |
| restriction, parameters_end_pos); |
| } |
| |
| namespace { |
| |
| struct ScriptCompileTimerScope { |
| public: |
| // TODO(leszeks): There are too many blink-specific entries in this enum, |
| // figure out a way to push produce/hit-isolate-cache/consume/consume-failed |
| // back up the API and log them in blink instead. |
| enum class CacheBehaviour { |
| kProduceCodeCache, |
| kHitIsolateCacheWhenNoCache, |
| kConsumeCodeCache, |
| kConsumeCodeCacheFailed, |
| kNoCacheBecauseInlineScript, |
| kNoCacheBecauseScriptTooSmall, |
| kNoCacheBecauseCacheTooCold, |
| kNoCacheNoReason, |
| kNoCacheBecauseNoResource, |
| kNoCacheBecauseInspector, |
| kNoCacheBecauseCachingDisabled, |
| kNoCacheBecauseModule, |
| kNoCacheBecauseStreamingSource, |
| kNoCacheBecauseV8Extension, |
| kHitIsolateCacheWhenProduceCodeCache, |
| kHitIsolateCacheWhenConsumeCodeCache, |
| kNoCacheBecauseExtensionModule, |
| kNoCacheBecausePacScript, |
| kNoCacheBecauseInDocumentWrite, |
| kNoCacheBecauseResourceWithNoCacheHandler, |
| kHitIsolateCacheWhenStreamingSource, |
| kCount |
| }; |
| |
| explicit ScriptCompileTimerScope( |
| Isolate* isolate, ScriptCompiler::NoCacheReason no_cache_reason) |
| : isolate_(isolate), |
| all_scripts_histogram_scope_(isolate->counters()->compile_script(), |
| true), |
| no_cache_reason_(no_cache_reason), |
| hit_isolate_cache_(false), |
| producing_code_cache_(false), |
| consuming_code_cache_(false), |
| consuming_code_cache_failed_(false) {} |
| |
| ~ScriptCompileTimerScope() { |
| CacheBehaviour cache_behaviour = GetCacheBehaviour(); |
| |
| Histogram* cache_behaviour_histogram = |
| isolate_->counters()->compile_script_cache_behaviour(); |
| // Sanity check that the histogram has exactly one bin per enum entry. |
| DCHECK_EQ(0, cache_behaviour_histogram->min()); |
| DCHECK_EQ(static_cast<int>(CacheBehaviour::kCount), |
| cache_behaviour_histogram->max() + 1); |
| DCHECK_EQ(static_cast<int>(CacheBehaviour::kCount), |
| cache_behaviour_histogram->num_buckets()); |
| cache_behaviour_histogram->AddSample(static_cast<int>(cache_behaviour)); |
| |
| histogram_scope_.set_histogram( |
| GetCacheBehaviourTimedHistogram(cache_behaviour)); |
| } |
| |
| void set_hit_isolate_cache() { hit_isolate_cache_ = true; } |
| |
| void set_producing_code_cache() { producing_code_cache_ = true; } |
| |
| void set_consuming_code_cache() { consuming_code_cache_ = true; } |
| |
| void set_consuming_code_cache_failed() { |
| consuming_code_cache_failed_ = true; |
| } |
| |
| private: |
| Isolate* isolate_; |
| LazyTimedHistogramScope histogram_scope_; |
| // TODO(leszeks): This timer is the sum of the other times, consider removing |
| // it to save space. |
| HistogramTimerScope all_scripts_histogram_scope_; |
| ScriptCompiler::NoCacheReason no_cache_reason_; |
| bool hit_isolate_cache_; |
| bool producing_code_cache_; |
| bool consuming_code_cache_; |
| bool consuming_code_cache_failed_; |
| |
| CacheBehaviour GetCacheBehaviour() { |
| if (producing_code_cache_) { |
| if (hit_isolate_cache_) { |
| return CacheBehaviour::kHitIsolateCacheWhenProduceCodeCache; |
| } else { |
| return CacheBehaviour::kProduceCodeCache; |
| } |
| } |
| |
| if (consuming_code_cache_) { |
| if (hit_isolate_cache_) { |
| return CacheBehaviour::kHitIsolateCacheWhenConsumeCodeCache; |
| } else if (consuming_code_cache_failed_) { |
| return CacheBehaviour::kConsumeCodeCacheFailed; |
| } |
| return CacheBehaviour::kConsumeCodeCache; |
| } |
| |
| if (hit_isolate_cache_) { |
| if (no_cache_reason_ == ScriptCompiler::kNoCacheBecauseStreamingSource) { |
| return CacheBehaviour::kHitIsolateCacheWhenStreamingSource; |
| } |
| return CacheBehaviour::kHitIsolateCacheWhenNoCache; |
| } |
| |
| switch (no_cache_reason_) { |
| case ScriptCompiler::kNoCacheBecauseInlineScript: |
| return CacheBehaviour::kNoCacheBecauseInlineScript; |
| case ScriptCompiler::kNoCacheBecauseScriptTooSmall: |
| return CacheBehaviour::kNoCacheBecauseScriptTooSmall; |
| case ScriptCompiler::kNoCacheBecauseCacheTooCold: |
| return CacheBehaviour::kNoCacheBecauseCacheTooCold; |
| case ScriptCompiler::kNoCacheNoReason: |
| return CacheBehaviour::kNoCacheNoReason; |
| case ScriptCompiler::kNoCacheBecauseNoResource: |
| return CacheBehaviour::kNoCacheBecauseNoResource; |
| case ScriptCompiler::kNoCacheBecauseInspector: |
| return CacheBehaviour::kNoCacheBecauseInspector; |
| case ScriptCompiler::kNoCacheBecauseCachingDisabled: |
| return CacheBehaviour::kNoCacheBecauseCachingDisabled; |
| case ScriptCompiler::kNoCacheBecauseModule: |
| return CacheBehaviour::kNoCacheBecauseModule; |
| case ScriptCompiler::kNoCacheBecauseStreamingSource: |
| return CacheBehaviour::kNoCacheBecauseStreamingSource; |
| case ScriptCompiler::kNoCacheBecauseV8Extension: |
| return CacheBehaviour::kNoCacheBecauseV8Extension; |
| case ScriptCompiler::kNoCacheBecauseExtensionModule: |
| return CacheBehaviour::kNoCacheBecauseExtensionModule; |
| case ScriptCompiler::kNoCacheBecausePacScript: |
| return CacheBehaviour::kNoCacheBecausePacScript; |
| case ScriptCompiler::kNoCacheBecauseInDocumentWrite: |
| return CacheBehaviour::kNoCacheBecauseInDocumentWrite; |
| case ScriptCompiler::kNoCacheBecauseResourceWithNoCacheHandler: |
| return CacheBehaviour::kNoCacheBecauseResourceWithNoCacheHandler; |
| case ScriptCompiler::kNoCacheBecauseDeferredProduceCodeCache: { |
| if (hit_isolate_cache_) { |
| return CacheBehaviour::kHitIsolateCacheWhenProduceCodeCache; |
| } else { |
| return CacheBehaviour::kProduceCodeCache; |
| } |
| } |
| } |
| UNREACHABLE(); |
| } |
| |
| TimedHistogram* GetCacheBehaviourTimedHistogram( |
| CacheBehaviour cache_behaviour) { |
| switch (cache_behaviour) { |
| case CacheBehaviour::kProduceCodeCache: |
| // Even if we hit the isolate's compilation cache, we currently recompile |
| // when we want to produce the code cache. |
| case CacheBehaviour::kHitIsolateCacheWhenProduceCodeCache: |
| return isolate_->counters()->compile_script_with_produce_cache(); |
| case CacheBehaviour::kHitIsolateCacheWhenNoCache: |
| case CacheBehaviour::kHitIsolateCacheWhenConsumeCodeCache: |
| case CacheBehaviour::kHitIsolateCacheWhenStreamingSource: |
| return isolate_->counters()->compile_script_with_isolate_cache_hit(); |
| case CacheBehaviour::kConsumeCodeCacheFailed: |
| return isolate_->counters()->compile_script_consume_failed(); |
| case CacheBehaviour::kConsumeCodeCache: |
| return isolate_->counters()->compile_script_with_consume_cache(); |
| |
| case CacheBehaviour::kNoCacheBecauseInlineScript: |
| return isolate_->counters() |
| ->compile_script_no_cache_because_inline_script(); |
| case CacheBehaviour::kNoCacheBecauseScriptTooSmall: |
| return isolate_->counters() |
| ->compile_script_no_cache_because_script_too_small(); |
| case CacheBehaviour::kNoCacheBecauseCacheTooCold: |
| return isolate_->counters() |
| ->compile_script_no_cache_because_cache_too_cold(); |
| |
| // Aggregate all the other "no cache" counters into a single histogram, to |
| // save space. |
| case CacheBehaviour::kNoCacheNoReason: |
| case CacheBehaviour::kNoCacheBecauseNoResource: |
| case CacheBehaviour::kNoCacheBecauseInspector: |
| case CacheBehaviour::kNoCacheBecauseCachingDisabled: |
| // TODO(leszeks): Consider counting separately once modules are more |
| // common. |
| case CacheBehaviour::kNoCacheBecauseModule: |
| // TODO(leszeks): Count separately or remove entirely once we have |
| // background compilation. |
| case CacheBehaviour::kNoCacheBecauseStreamingSource: |
| case CacheBehaviour::kNoCacheBecauseV8Extension: |
| case CacheBehaviour::kNoCacheBecauseExtensionModule: |
| case CacheBehaviour::kNoCacheBecausePacScript: |
| case CacheBehaviour::kNoCacheBecauseInDocumentWrite: |
| case CacheBehaviour::kNoCacheBecauseResourceWithNoCacheHandler: |
| return isolate_->counters()->compile_script_no_cache_other(); |
| |
| case CacheBehaviour::kCount: |
| UNREACHABLE(); |
| } |
| UNREACHABLE(); |
| } |
| }; |
| |
| Handle<Script> NewScript(Isolate* isolate, ParseInfo* parse_info, |
| Handle<String> source, |
| Compiler::ScriptDetails script_details, |
| ScriptOriginOptions origin_options, |
| NativesFlag natives) { |
| // Create a script object describing the script to be compiled. |
| Handle<Script> script = |
| parse_info->CreateScript(isolate, source, origin_options, natives); |
| Handle<Object> script_name; |
| if (script_details.name_obj.ToHandle(&script_name)) { |
| script->set_name(*script_name); |
| script->set_line_offset(script_details.line_offset); |
| script->set_column_offset(script_details.column_offset); |
| } |
| Handle<Object> source_map_url; |
| if (script_details.source_map_url.ToHandle(&source_map_url)) { |
| script->set_source_mapping_url(*source_map_url); |
| } |
| Handle<FixedArray> host_defined_options; |
| if (script_details.host_defined_options.ToHandle(&host_defined_options)) { |
| script->set_host_defined_options(*host_defined_options); |
| } |
| LOG(isolate, ScriptDetails(*script)); |
| TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID( |
| TRACE_DISABLED_BY_DEFAULT("v8.compile"), "Script", |
| TRACE_ID_WITH_SCOPE(Script::kTraceScope, script->id()), |
| script->ToTracedValue()); |
| return script; |
| } |
| |
| } // namespace |
| |
| MaybeHandle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForScript( |
| Isolate* isolate, Handle<String> source, |
| const Compiler::ScriptDetails& script_details, |
| ScriptOriginOptions origin_options, v8::Extension* extension, |
| ScriptData* cached_data, ScriptCompiler::CompileOptions compile_options, |
| ScriptCompiler::NoCacheReason no_cache_reason, NativesFlag natives) { |
| ScriptCompileTimerScope compile_timer(isolate, no_cache_reason); |
| |
| if (compile_options == ScriptCompiler::kNoCompileOptions || |
| compile_options == ScriptCompiler::kEagerCompile) { |
| DCHECK_NULL(cached_data); |
| } else { |
| DCHECK(compile_options == ScriptCompiler::kConsumeCodeCache); |
| DCHECK(cached_data); |
| DCHECK_NULL(extension); |
| } |
| int source_length = source->length(); |
| isolate->counters()->total_load_size()->Increment(source_length); |
| isolate->counters()->total_compile_size()->Increment(source_length); |
| |
| LanguageMode language_mode = construct_language_mode(FLAG_use_strict); |
| CompilationCache* compilation_cache = isolate->compilation_cache(); |
| |
| // Do a lookup in the compilation cache but not for extensions. |
| MaybeHandle<SharedFunctionInfo> maybe_result; |
| IsCompiledScope is_compiled_scope; |
| if (extension == nullptr) { |
| bool can_consume_code_cache = |
| compile_options == ScriptCompiler::kConsumeCodeCache; |
| if (can_consume_code_cache) { |
| compile_timer.set_consuming_code_cache(); |
| } |
| |
| // First check per-isolate compilation cache. |
| maybe_result = compilation_cache->LookupScript( |
| source, script_details.name_obj, script_details.line_offset, |
| script_details.column_offset, origin_options, isolate->native_context(), |
| language_mode); |
| if (!maybe_result.is_null()) { |
| compile_timer.set_hit_isolate_cache(); |
| } else if (can_consume_code_cache) { |
| compile_timer.set_consuming_code_cache(); |
| // Then check cached code provided by embedder. |
| HistogramTimerScope timer(isolate->counters()->compile_deserialize()); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, RuntimeCallCounterId::kCompileDeserialize); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.CompileDeserialize"); |
| Handle<SharedFunctionInfo> inner_result; |
| if (CodeSerializer::Deserialize(isolate, cached_data, source, |
| origin_options) |
| .ToHandle(&inner_result) && |
| inner_result->is_compiled()) { |
| // Promote to per-isolate compilation cache. |
| is_compiled_scope = inner_result->is_compiled_scope(); |
| DCHECK(is_compiled_scope.is_compiled()); |
| compilation_cache->PutScript(source, isolate->native_context(), |
| language_mode, inner_result); |
| Handle<Script> script(Script::cast(inner_result->script()), isolate); |
| maybe_result = inner_result; |
| } else { |
| // Deserializer failed. Fall through to compile. |
| compile_timer.set_consuming_code_cache_failed(); |
| } |
| } |
| } |
| |
| if (maybe_result.is_null()) { |
| ParseInfo parse_info(isolate); |
| // No cache entry found compile the script. |
| NewScript(isolate, &parse_info, source, script_details, origin_options, |
| natives); |
| |
| // Compile the function and add it to the isolate cache. |
| if (origin_options.IsModule()) parse_info.set_module(); |
| parse_info.set_extension(extension); |
| parse_info.set_eager(compile_options == ScriptCompiler::kEagerCompile); |
| |
| parse_info.set_language_mode( |
| stricter_language_mode(parse_info.language_mode(), language_mode)); |
| maybe_result = CompileToplevel(&parse_info, isolate, &is_compiled_scope); |
| Handle<SharedFunctionInfo> result; |
| if (extension == nullptr && maybe_result.ToHandle(&result)) { |
| DCHECK(is_compiled_scope.is_compiled()); |
| compilation_cache->PutScript(source, isolate->native_context(), |
| language_mode, result); |
| } else if (maybe_result.is_null() && natives != EXTENSION_CODE) { |
| isolate->ReportPendingMessages(); |
| } |
| } |
| |
| return maybe_result; |
| } |
| |
| MaybeHandle<JSFunction> Compiler::GetWrappedFunction( |
| Handle<String> source, Handle<FixedArray> arguments, |
| Handle<Context> context, const Compiler::ScriptDetails& script_details, |
| ScriptOriginOptions origin_options, ScriptData* cached_data, |
| v8::ScriptCompiler::CompileOptions compile_options, |
| v8::ScriptCompiler::NoCacheReason no_cache_reason) { |
| Isolate* isolate = context->GetIsolate(); |
| ScriptCompileTimerScope compile_timer(isolate, no_cache_reason); |
| |
| if (compile_options == ScriptCompiler::kNoCompileOptions || |
| compile_options == ScriptCompiler::kEagerCompile) { |
| DCHECK_NULL(cached_data); |
| } else { |
| DCHECK(compile_options == ScriptCompiler::kConsumeCodeCache); |
| DCHECK(cached_data); |
| } |
| |
| int source_length = source->length(); |
| isolate->counters()->total_compile_size()->Increment(source_length); |
| |
| LanguageMode language_mode = construct_language_mode(FLAG_use_strict); |
| |
| MaybeHandle<SharedFunctionInfo> maybe_result; |
| bool can_consume_code_cache = |
| compile_options == ScriptCompiler::kConsumeCodeCache; |
| if (can_consume_code_cache) { |
| compile_timer.set_consuming_code_cache(); |
| // Then check cached code provided by embedder. |
| HistogramTimerScope timer(isolate->counters()->compile_deserialize()); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, RuntimeCallCounterId::kCompileDeserialize); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.CompileDeserialize"); |
| maybe_result = CodeSerializer::Deserialize(isolate, cached_data, source, |
| origin_options); |
| if (maybe_result.is_null()) { |
| // Deserializer failed. Fall through to compile. |
| compile_timer.set_consuming_code_cache_failed(); |
| } |
| } |
| |
| Handle<SharedFunctionInfo> wrapped; |
| Handle<Script> script; |
| IsCompiledScope is_compiled_scope; |
| if (!maybe_result.ToHandle(&wrapped)) { |
| ParseInfo parse_info(isolate); |
| script = NewScript(isolate, &parse_info, source, script_details, |
| origin_options, NOT_NATIVES_CODE); |
| script->set_wrapped_arguments(*arguments); |
| |
| parse_info.set_eval(); // Use an eval scope as declaration scope. |
| parse_info.set_wrapped_as_function(); |
| // parse_info.set_eager(compile_options == ScriptCompiler::kEagerCompile); |
| if (!context->IsNativeContext()) { |
| parse_info.set_outer_scope_info(handle(context->scope_info(), isolate)); |
| } |
| parse_info.set_language_mode( |
| stricter_language_mode(parse_info.language_mode(), language_mode)); |
| |
| Handle<SharedFunctionInfo> top_level; |
| maybe_result = CompileToplevel(&parse_info, isolate, &is_compiled_scope); |
| if (maybe_result.is_null()) isolate->ReportPendingMessages(); |
| ASSIGN_RETURN_ON_EXCEPTION(isolate, top_level, maybe_result, JSFunction); |
| |
| SharedFunctionInfo::ScriptIterator infos(isolate, *script); |
| for (SharedFunctionInfo info = infos.Next(); !info.is_null(); |
| info = infos.Next()) { |
| if (info.is_wrapped()) { |
| wrapped = Handle<SharedFunctionInfo>(info, isolate); |
| break; |
| } |
| } |
| DCHECK(!wrapped.is_null()); |
| } else { |
| is_compiled_scope = wrapped->is_compiled_scope(); |
| script = Handle<Script>(Script::cast(wrapped->script()), isolate); |
| } |
| DCHECK(is_compiled_scope.is_compiled()); |
| |
| return isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| wrapped, context, AllocationType::kYoung); |
| } |
| |
| MaybeHandle<SharedFunctionInfo> |
| Compiler::GetSharedFunctionInfoForStreamedScript( |
| Isolate* isolate, Handle<String> source, |
| const ScriptDetails& script_details, ScriptOriginOptions origin_options, |
| ScriptStreamingData* streaming_data) { |
| ScriptCompileTimerScope compile_timer( |
| isolate, ScriptCompiler::kNoCacheBecauseStreamingSource); |
| PostponeInterruptsScope postpone(isolate); |
| |
| int source_length = source->length(); |
| isolate->counters()->total_load_size()->Increment(source_length); |
| isolate->counters()->total_compile_size()->Increment(source_length); |
| |
| BackgroundCompileTask* task = streaming_data->task.get(); |
| ParseInfo* parse_info = task->info(); |
| DCHECK(parse_info->is_toplevel()); |
| // Check if compile cache already holds the SFI, if so no need to finalize |
| // the code compiled on the background thread. |
| CompilationCache* compilation_cache = isolate->compilation_cache(); |
| MaybeHandle<SharedFunctionInfo> maybe_result = |
| compilation_cache->LookupScript( |
| source, script_details.name_obj, script_details.line_offset, |
| script_details.column_offset, origin_options, |
| isolate->native_context(), parse_info->language_mode()); |
| if (!maybe_result.is_null()) { |
| compile_timer.set_hit_isolate_cache(); |
| } |
| |
| if (maybe_result.is_null()) { |
| // No cache entry found, finalize compilation of the script and add it to |
| // the isolate cache. |
| Handle<Script> script = |
| NewScript(isolate, parse_info, source, script_details, origin_options, |
| NOT_NATIVES_CODE); |
| task->parser()->UpdateStatistics(isolate, script); |
| task->parser()->HandleSourceURLComments(isolate, script); |
| |
| if (parse_info->literal() == nullptr || !task->outer_function_job()) { |
| // Parsing has failed - report error messages. |
| FailWithPendingException(isolate, parse_info, |
| Compiler::ClearExceptionFlag::KEEP_EXCEPTION); |
| } else { |
| // Parsing has succeeded - finalize compilation. |
| maybe_result = |
| FinalizeTopLevel(parse_info, isolate, task->outer_function_job(), |
| task->inner_function_jobs()); |
| if (maybe_result.is_null()) { |
| // Finalization failed - throw an exception. |
| FailWithPendingException(isolate, parse_info, |
| Compiler::ClearExceptionFlag::KEEP_EXCEPTION); |
| } |
| } |
| |
| // Add compiled code to the isolate cache. |
| Handle<SharedFunctionInfo> result; |
| if (maybe_result.ToHandle(&result)) { |
| compilation_cache->PutScript(source, isolate->native_context(), |
| parse_info->language_mode(), result); |
| } |
| } |
| |
| streaming_data->Release(); |
| return maybe_result; |
| } |
| |
| Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfo( |
| FunctionLiteral* literal, Handle<Script> script, Isolate* isolate) { |
| // Precondition: code has been parsed and scopes have been analyzed. |
| MaybeHandle<SharedFunctionInfo> maybe_existing; |
| |
| // Find any previously allocated shared function info for the given literal. |
| maybe_existing = script->FindSharedFunctionInfo(isolate, literal); |
| |
| // If we found an existing shared function info, return it. |
| Handle<SharedFunctionInfo> existing; |
| if (maybe_existing.ToHandle(&existing)) return existing; |
| |
| // Allocate a shared function info object which will be compiled lazily. |
| Handle<SharedFunctionInfo> result = |
| isolate->factory()->NewSharedFunctionInfoForLiteral(literal, script, |
| false); |
| return result; |
| } |
| |
| MaybeHandle<Code> Compiler::GetOptimizedCodeForOSR(Handle<JSFunction> function, |
| BailoutId osr_offset, |
| JavaScriptFrame* osr_frame) { |
| DCHECK(!osr_offset.IsNone()); |
| DCHECK_NOT_NULL(osr_frame); |
| return GetOptimizedCode(function, ConcurrencyMode::kNotConcurrent, osr_offset, |
| osr_frame); |
| } |
| |
| bool Compiler::FinalizeOptimizedCompilationJob(OptimizedCompilationJob* job, |
| Isolate* isolate) { |
| VMState<COMPILER> state(isolate); |
| // Take ownership of compilation job. Deleting job also tears down the zone. |
| std::unique_ptr<OptimizedCompilationJob> job_scope(job); |
| OptimizedCompilationInfo* compilation_info = job->compilation_info(); |
| |
| TimerEventScope<TimerEventRecompileSynchronous> timer(isolate); |
| RuntimeCallTimerScope runtimeTimer( |
| isolate, RuntimeCallCounterId::kRecompileSynchronous); |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), |
| "V8.RecompileSynchronous"); |
| |
| Handle<SharedFunctionInfo> shared = compilation_info->shared_info(); |
| |
| // Reset profiler ticks, function is no longer considered hot. |
| compilation_info->closure()->feedback_vector().set_profiler_ticks(0); |
| |
| DCHECK(!shared->HasBreakInfo()); |
| |
| // 1) Optimization on the concurrent thread may have failed. |
| // 2) The function may have already been optimized by OSR. Simply continue. |
| // Except when OSR already disabled optimization for some reason. |
| // 3) The code may have already been invalidated due to dependency change. |
| // 4) Code generation may have failed. |
| if (job->state() == CompilationJob::State::kReadyToFinalize) { |
| if (shared->optimization_disabled()) { |
| job->RetryOptimization(BailoutReason::kOptimizationDisabled); |
| } else if (job->FinalizeJob(isolate) == CompilationJob::SUCCEEDED) { |
| job->RecordCompilationStats(OptimizedCompilationJob::kConcurrent, |
| isolate); |
| job->RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG, |
| isolate); |
| InsertCodeIntoOptimizedCodeCache(compilation_info); |
| if (FLAG_trace_opt) { |
| PrintF("[completed optimizing "); |
| compilation_info->closure()->ShortPrint(); |
| PrintF("]\n"); |
| } |
| compilation_info->closure()->set_code(*compilation_info->code()); |
| return CompilationJob::SUCCEEDED; |
| } |
| } |
| |
| DCHECK_EQ(job->state(), CompilationJob::State::kFailed); |
| if (FLAG_trace_opt) { |
| PrintF("[aborted optimizing "); |
| compilation_info->closure()->ShortPrint(); |
| PrintF(" because: %s]\n", |
| GetBailoutReason(compilation_info->bailout_reason())); |
| } |
| compilation_info->closure()->set_code(shared->GetCode()); |
| // Clear the InOptimizationQueue marker, if it exists. |
| if (compilation_info->closure()->IsInOptimizationQueue()) { |
| compilation_info->closure()->ClearOptimizationMarker(); |
| } |
| return CompilationJob::FAILED; |
| } |
| |
| void Compiler::PostInstantiation(Handle<JSFunction> function, |
| AllocationType allocation) { |
| Isolate* isolate = function->GetIsolate(); |
| Handle<SharedFunctionInfo> shared(function->shared(), isolate); |
| IsCompiledScope is_compiled_scope(shared->is_compiled_scope()); |
| |
| // If code is compiled to bytecode (i.e., isn't asm.js), then allocate a |
| // feedback and check for optimized code. |
| if (is_compiled_scope.is_compiled() && shared->HasBytecodeArray()) { |
| JSFunction::InitializeFeedbackCell(function); |
| |
| Code code = function->has_feedback_vector() |
| ? function->feedback_vector().optimized_code() |
| : Code(); |
| if (!code.is_null()) { |
| // Caching of optimized code enabled and optimized code found. |
| DCHECK(!code.marked_for_deoptimization()); |
| DCHECK(function->shared().is_compiled()); |
| function->set_code(code); |
| } |
| |
| if (FLAG_always_opt && shared->allows_lazy_compilation() && |
| !shared->optimization_disabled() && !function->IsOptimized() && |
| !function->HasOptimizedCode()) { |
| JSFunction::EnsureFeedbackVector(function); |
| function->MarkForOptimization(ConcurrencyMode::kNotConcurrent); |
| } |
| } |
| |
| if (shared->is_toplevel() || shared->is_wrapped()) { |
| // If it's a top-level script, report compilation to the debugger. |
| Handle<Script> script(Script::cast(shared->script()), isolate); |
| isolate->debug()->OnAfterCompile(script); |
| } |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation of ScriptStreamingData |
| |
| ScriptStreamingData::ScriptStreamingData( |
| std::unique_ptr<ScriptCompiler::ExternalSourceStream> source_stream, |
| ScriptCompiler::StreamedSource::Encoding encoding) |
| : source_stream(std::move(source_stream)), encoding(encoding) {} |
| |
| ScriptStreamingData::~ScriptStreamingData() = default; |
| |
| void ScriptStreamingData::Release() { task.reset(); } |
| |
| } // namespace internal |
| } // namespace v8 |
