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cobalt / cobalt / ef837fa448402e2ada2fb3821210cc20d850164b / . / src / v8 / src / compiler.cc
blob: 89b3a7e5aebaf27f568a5375554f08db97e34ae2 [file] [log] [blame]
// 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/compiler.h"
#include <algorithm>
#include <memory>
#include "src/api.h"
#include "src/asmjs/asm-js.h"
#include "src/assembler-inl.h"
#include "src/ast/ast-numbering.h"
#include "src/ast/prettyprinter.h"
#include "src/ast/scopes.h"
#include "src/base/optional.h"
#include "src/bootstrapper.h"
#include "src/codegen.h"
#include "src/compilation-cache.h"
#include "src/compilation-info.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/frames-inl.h"
#include "src/globals.h"
#include "src/heap/heap.h"
#include "src/interpreter/interpreter.h"
#include "src/isolate-inl.h"
#include "src/log-inl.h"
#include "src/messages.h"
#include "src/objects/map.h"
#include "src/parsing/parse-info.h"
#include "src/parsing/parsing.h"
#include "src/parsing/rewriter.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/runtime-profiler.h"
#include "src/snapshot/code-serializer.h"
#include "src/vm-state-inl.h"
namespace v8 {
namespace internal {
// A wrapper around a CompilationInfo that detaches the Handles from
// the underlying DeferredHandleScope and stores them in info_ on
// destruction.
class CompilationHandleScope final {
public:
explicit CompilationHandleScope(CompilationInfo* info)
: deferred_(info->isolate()), info_(info) {}
~CompilationHandleScope() { info_->set_deferred_handles(deferred_.Detach()); }
private:
DeferredHandleScope deferred_;
CompilationInfo* info_;
};
// Helper that times a scoped region and records the elapsed time.
struct ScopedTimer {
explicit ScopedTimer(base::TimeDelta* location) : location_(location) {
DCHECK(location_ != NULL);
timer_.Start();
}
~ScopedTimer() { *location_ += timer_.Elapsed(); }
base::ElapsedTimer timer_;
base::TimeDelta* location_;
};
// ----------------------------------------------------------------------------
// Implementation of CompilationJob
CompilationJob::CompilationJob(Isolate* isolate, ParseInfo* parse_info,
CompilationInfo* compilation_info,
const char* compiler_name, State initial_state)
: parse_info_(parse_info),
compilation_info_(compilation_info),
isolate_thread_id_(isolate->thread_id()),
compiler_name_(compiler_name),
state_(initial_state),
stack_limit_(isolate->stack_guard()->real_climit()),
executed_on_background_thread_(false) {}
CompilationJob::Status CompilationJob::PrepareJob() {
DCHECK(
ThreadId::Current().Equals(compilation_info()->isolate()->thread_id()));
DisallowJavascriptExecution no_js(isolate());
if (FLAG_trace_opt && compilation_info()->IsOptimizing()) {
OFStream os(stdout);
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(state() == State::kReadyToPrepare);
ScopedTimer t(&time_taken_to_prepare_);
return UpdateState(PrepareJobImpl(), State::kReadyToExecute);
}
CompilationJob::Status CompilationJob::ExecuteJob() {
base::Optional<DisallowHeapAllocation> no_allocation;
base::Optional<DisallowHandleAllocation> no_handles;
base::Optional<DisallowHandleDereference> no_deref;
base::Optional<DisallowCodeDependencyChange> no_dependency_change;
if (can_execute_on_background_thread()) {
no_allocation.emplace();
no_handles.emplace();
no_deref.emplace();
no_dependency_change.emplace();
executed_on_background_thread_ =
!ThreadId::Current().Equals(isolate_thread_id_);
} else {
DCHECK(ThreadId::Current().Equals(isolate_thread_id_));
}
// Delegate to the underlying implementation.
DCHECK(state() == State::kReadyToExecute);
ScopedTimer t(&time_taken_to_execute_);
return UpdateState(ExecuteJobImpl(), State::kReadyToFinalize);
}
CompilationJob::Status CompilationJob::FinalizeJob() {
DCHECK(
ThreadId::Current().Equals(compilation_info()->isolate()->thread_id()));
DisallowCodeDependencyChange no_dependency_change;
DisallowJavascriptExecution no_js(isolate());
DCHECK(!compilation_info()->dependencies()->HasAborted());
// Delegate to the underlying implementation.
DCHECK(state() == State::kReadyToFinalize);
ScopedTimer t(&time_taken_to_finalize_);
return UpdateState(FinalizeJobImpl(), State::kSucceeded);
}
CompilationJob::Status CompilationJob::RetryOptimization(BailoutReason reason) {
DCHECK(compilation_info_->IsOptimizing());
compilation_info_->RetryOptimization(reason);
state_ = State::kFailed;
return FAILED;
}
CompilationJob::Status CompilationJob::AbortOptimization(BailoutReason reason) {
DCHECK(compilation_info_->IsOptimizing());
compilation_info_->AbortOptimization(reason);
state_ = State::kFailed;
return FAILED;
}
void CompilationJob::RecordUnoptimizedCompilationStats() const {
int code_size;
if (compilation_info()->has_bytecode_array()) {
code_size = compilation_info()->bytecode_array()->SizeIncludingMetadata();
} else {
code_size = compilation_info()->code()->SizeIncludingMetadata();
}
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.
}
void CompilationJob::RecordOptimizedCompilationStats() 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);
}
}
Isolate* CompilationJob::isolate() const {
return compilation_info()->isolate();
}
// ----------------------------------------------------------------------------
// Local helper methods that make up the compilation pipeline.
namespace {
void RecordFunctionCompilation(CodeEventListener::LogEventsAndTags tag,
Handle<Script> script,
CompilationInfo* compilation_info) {
// 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 (compilation_info->isolate()->logger()->is_logging_code_events() ||
compilation_info->isolate()->is_profiling()) {
Handle<SharedFunctionInfo> shared = compilation_info->shared_info();
Handle<AbstractCode> abstract_code =
compilation_info->has_bytecode_array()
? Handle<AbstractCode>::cast(compilation_info->bytecode_array())
: Handle<AbstractCode>::cast(compilation_info->code());
if (abstract_code.is_identical_to(
BUILTIN_CODE(compilation_info->isolate(), CompileLazy))) {
return;
}
int line_num = Script::GetLineNumber(script, shared->start_position()) + 1;
int column_num =
Script::GetColumnNumber(script, shared->start_position()) + 1;
String* script_name =
script->name()->IsString()
? String::cast(script->name())
: compilation_info->isolate()->heap()->empty_string();
CodeEventListener::LogEventsAndTags log_tag =
Logger::ToNativeByScript(tag, *script);
PROFILE(compilation_info->isolate(),
CodeCreateEvent(log_tag, *abstract_code, *shared, script_name,
line_num, column_num));
}
}
void EnsureFeedbackMetadata(CompilationInfo* compilation_info) {
DCHECK(compilation_info->has_shared_info());
// If no type feedback metadata exists, create it. At this point the
// AstNumbering pass has already run. Note the snapshot can contain outdated
// vectors for a different configuration, hence we also recreate a new vector
// when the function is not compiled (i.e. no code was serialized).
// TODO(mvstanton): reintroduce is_empty() predicate to feedback_metadata().
if (compilation_info->shared_info()->feedback_metadata()->length() == 0 ||
!compilation_info->shared_info()->is_compiled()) {
Handle<FeedbackMetadata> feedback_metadata = FeedbackMetadata::New(
compilation_info->isolate(),
compilation_info->literal()->feedback_vector_spec());
compilation_info->shared_info()->set_feedback_metadata(*feedback_metadata);
}
// It's very important that recompiles do not alter the structure of the type
// feedback vector. Verify that the structure fits the function literal.
CHECK(!compilation_info->shared_info()->feedback_metadata()->SpecDiffersFrom(
compilation_info->literal()->feedback_vector_spec()));
}
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 InstallUnoptimizedCode(CompilationInfo* compilation_info) {
Handle<SharedFunctionInfo> shared = compilation_info->shared_info();
DCHECK_EQ(compilation_info->shared_info()->language_mode(),
compilation_info->literal()->language_mode());
// Ensure feedback metadata is installed.
EnsureFeedbackMetadata(compilation_info);
// Update the shared function info with the scope info.
Handle<ScopeInfo> scope_info = compilation_info->scope()->scope_info();
shared->set_scope_info(*scope_info);
Scope* outer_scope = compilation_info->scope()->GetOuterScopeWithContext();
if (outer_scope) {
shared->set_outer_scope_info(*outer_scope->scope_info());
}
DCHECK(!compilation_info->code().is_null());
shared->set_code(*compilation_info->code());
if (compilation_info->has_bytecode_array()) {
DCHECK(!shared->HasBytecodeArray()); // Only compiled once.
DCHECK(!compilation_info->has_asm_wasm_data());
shared->set_bytecode_array(*compilation_info->bytecode_array());
} else if (compilation_info->has_asm_wasm_data()) {
shared->set_asm_wasm_data(*compilation_info->asm_wasm_data());
}
// Install coverage info on the shared function info.
if (compilation_info->has_coverage_info()) {
DCHECK(compilation_info->isolate()->is_block_code_coverage());
compilation_info->isolate()->debug()->InstallCoverageInfo(
compilation_info->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<FixedArray> infos(isolate->factory()->NewFixedArray(
parse_info->max_function_literal_id() + 1));
parse_info->script()->set_shared_function_infos(*infos);
}
void SetSharedFunctionFlagsFromLiteral(FunctionLiteral* literal,
Handle<SharedFunctionInfo> shared_info) {
// Don't overwrite values set by the bootstrapper.
if (!shared_info->HasLength()) {
shared_info->set_length(literal->function_length());
}
shared_info->set_has_duplicate_parameters(
literal->has_duplicate_parameters());
shared_info->SetExpectedNofPropertiesFromEstimate(literal);
if (literal->dont_optimize_reason() != kNoReason) {
shared_info->DisableOptimization(literal->dont_optimize_reason());
}
}
CompilationJob::Status FinalizeUnoptimizedCompilationJob(CompilationJob* job) {
CompilationInfo* compilation_info = job->compilation_info();
ParseInfo* parse_info = job->parse_info();
SetSharedFunctionFlagsFromLiteral(compilation_info->literal(),
compilation_info->shared_info());
CompilationJob::Status status = job->FinalizeJob();
if (status == CompilationJob::SUCCEEDED) {
InstallUnoptimizedCode(compilation_info);
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;
}
RecordFunctionCompilation(log_tag, parse_info->script(), compilation_info);
job->RecordUnoptimizedCompilationStats();
}
return status;
}
bool Renumber(ParseInfo* parse_info,
Compiler::EagerInnerFunctionLiterals* eager_literals) {
RuntimeCallTimerScope runtimeTimer(parse_info->runtime_call_stats(),
&RuntimeCallStats::CompileRenumber);
return AstNumbering::Renumber(parse_info->stack_limit(), parse_info->zone(),
parse_info->literal(), eager_literals,
parse_info->collect_type_profile());
}
std::unique_ptr<CompilationJob> PrepareAndExecuteUnoptimizedCompileJob(
ParseInfo* parse_info, FunctionLiteral* literal, Isolate* isolate) {
if (UseAsmWasm(literal, parse_info->is_asm_wasm_broken())) {
std::unique_ptr<CompilationJob> asm_job(
AsmJs::NewCompilationJob(parse_info, literal, isolate));
if (asm_job->PrepareJob() == CompilationJob::SUCCEEDED &&
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::unique_ptr<CompilationJob> job(
interpreter::Interpreter::NewCompilationJob(parse_info, literal,
isolate));
if (job->PrepareJob() == CompilationJob::SUCCEEDED &&
job->ExecuteJob() == CompilationJob::SUCCEEDED) {
return job;
}
return std::unique_ptr<CompilationJob>(); // Compilation failed, return null.
}
// TODO(rmcilroy): Remove |isolate| once CompilationJob doesn't need it.
std::unique_ptr<CompilationJob> GenerateUnoptimizedCode(
ParseInfo* parse_info, Isolate* isolate,
std::forward_list<std::unique_ptr<CompilationJob>>* inner_function_jobs) {
DisallowHeapAllocation no_allocation;
DisallowHandleAllocation no_handles;
DisallowHandleDereference no_deref;
DCHECK(inner_function_jobs->empty());
DCHECK_IMPLIES(parse_info->consumed_preparsed_scope_data()->HasData(),
ThreadId::Current().Equals(isolate->thread_id()));
Compiler::EagerInnerFunctionLiterals inner_literals;
if (!Compiler::Analyze(parse_info, &inner_literals)) {
return std::unique_ptr<CompilationJob>();
}
// Prepare and execute compilation of the outer-most function.
std::unique_ptr<CompilationJob> outer_function_job(
PrepareAndExecuteUnoptimizedCompileJob(parse_info, parse_info->literal(),
isolate));
if (!outer_function_job) return std::unique_ptr<CompilationJob>();
// Prepare and execute compilation jobs for eager inner functions.
for (auto it : inner_literals) {
FunctionLiteral* inner_literal = it->value();
std::unique_ptr<CompilationJob> inner_job(
PrepareAndExecuteUnoptimizedCompileJob(parse_info, inner_literal,
isolate));
if (!inner_job) return std::unique_ptr<CompilationJob>();
inner_function_jobs->emplace_front(std::move(inner_job));
}
// Character stream shouldn't be used again.
parse_info->ResetCharacterStream();
return outer_function_job;
}
bool FinalizeUnoptimizedCode(
ParseInfo* parse_info, Isolate* isolate,
Handle<SharedFunctionInfo> shared_info, CompilationJob* outer_function_job,
std::forward_list<std::unique_ptr<CompilationJob>>* inner_function_jobs) {
DCHECK(AllowCompilation::IsAllowed(isolate));
// Allocate scope infos for the literal.
DeclarationScope::AllocateScopeInfos(parse_info, isolate,
AnalyzeMode::kRegular);
// Finalize the outer-most function's compilation job.
outer_function_job->compilation_info()->set_shared_info(shared_info);
if (FinalizeUnoptimizedCompilationJob(outer_function_job) !=
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.
// TODO(rmcilroy): Fix this and DCHECK !is_compiled() once Full-Codegen dies
if (inner_shared_info->is_compiled()) continue;
inner_job->compilation_info()->set_shared_info(inner_shared_info);
if (FinalizeUnoptimizedCompilationJob(inner_job.get()) !=
CompilationJob::SUCCEEDED) {
return false;
}
}
return true;
}
MUST_USE_RESULT MaybeHandle<Code> GetCodeFromOptimizedCodeCache(
Handle<JSFunction> function, BailoutId osr_offset) {
RuntimeCallTimerScope runtimeTimer(
function->GetIsolate(),
&RuntimeCallStats::CompileGetFromOptimizedCodeMap);
Handle<SharedFunctionInfo> shared(function->shared());
DisallowHeapAllocation no_gc;
if (osr_offset.IsNone()) {
if (function->feedback_vector_cell()->value()->IsFeedbackVector()) {
FeedbackVector* feedback_vector = function->feedback_vector();
feedback_vector->EvictOptimizedCodeMarkedForDeoptimization(
function->shared(), "GetCodeFromOptimizedCodeCache");
Code* code = feedback_vector->optimized_code();
if (code != nullptr) {
// Caching of optimized code enabled and optimized code found.
DCHECK(!code->marked_for_deoptimization());
DCHECK(function->shared()->is_compiled());
return Handle<Code>(code);
}
}
}
return MaybeHandle<Code>();
}
void ClearOptimizedCodeCache(CompilationInfo* compilation_info) {
Handle<JSFunction> function = compilation_info->closure();
if (compilation_info->osr_offset().IsNone()) {
Handle<FeedbackVector> vector =
handle(function->feedback_vector(), function->GetIsolate());
vector->ClearOptimizedCode();
}
}
void InsertCodeIntoOptimizedCodeCache(CompilationInfo* 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());
Handle<Context> native_context(function->context()->native_context());
if (compilation_info->osr_offset().IsNone()) {
Handle<FeedbackVector> vector =
handle(function->feedback_vector(), function->GetIsolate());
FeedbackVector::SetOptimizedCode(vector, code);
}
}
bool GetOptimizedCodeNow(CompilationJob* job) {
CompilationInfo* compilation_info = job->compilation_info();
Isolate* isolate = compilation_info->isolate();
TimerEventScope<TimerEventRecompileSynchronous> timer(isolate);
RuntimeCallTimerScope runtimeTimer(isolate,
&RuntimeCallStats::RecompileSynchronous);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.RecompileSynchronous");
if (job->PrepareJob() != CompilationJob::SUCCEEDED ||
job->ExecuteJob() != CompilationJob::SUCCEEDED ||
job->FinalizeJob() != 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->RecordOptimizedCompilationStats();
DCHECK(!isolate->has_pending_exception());
InsertCodeIntoOptimizedCodeCache(compilation_info);
RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG,
job->parse_info()->script(), compilation_info);
return true;
}
bool GetOptimizedCodeLater(CompilationJob* job) {
CompilationInfo* compilation_info = job->compilation_info();
Isolate* isolate = compilation_info->isolate();
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,
&RuntimeCallStats::RecompileSynchronous);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.RecompileSynchronous");
if (job->PrepareJob() != 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();
}
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);
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<CompilationJob> job(
compiler::Pipeline::NewCompilationJob(function, has_script));
CompilationInfo* compilation_info = job->compilation_info();
ParseInfo* parse_info = job->parse_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(kFunctionBeingDebugged);
return MaybeHandle<Code>();
}
// Do not use TurboFan when %NeverOptimizeFunction was applied.
if (shared->optimization_disabled() &&
shared->disable_optimization_reason() == kOptimizationDisabledForTest) {
compilation_info->AbortOptimization(kOptimizationDisabledForTest);
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(kOptimizationDisabled);
return MaybeHandle<Code>();
}
TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate);
RuntimeCallTimerScope runtimeTimer(isolate, &RuntimeCallStats::OptimizeCode);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.OptimizeCode");
// 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(compilation_info);
}
// All handles below will be canonicalized.
CanonicalHandleScope canonical(isolate);
// Reopen handles in the new CompilationHandleScope.
compilation_info->ReopenHandlesInNewHandleScope();
parse_info->ReopenHandlesInNewHandleScope();
if (mode == ConcurrencyMode::kConcurrent) {
if (GetOptimizedCodeLater(job.get())) {
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);
if (function->IsInterpreted()) {
return BUILTIN_CODE(isolate, InterpreterEntryTrampoline);
} else {
return BUILTIN_CODE(isolate, CheckOptimizationMarker);
}
}
} else {
if (GetOptimizedCodeNow(job.get())) return compilation_info->code();
}
if (isolate->has_pending_exception()) isolate->clear_pending_exception();
return MaybeHandle<Code>();
}
CompilationJob::Status FinalizeOptimizedCompilationJob(CompilationJob* job) {
CompilationInfo* compilation_info = job->compilation_info();
Isolate* isolate = compilation_info->isolate();
TimerEventScope<TimerEventRecompileSynchronous> timer(isolate);
RuntimeCallTimerScope runtimeTimer(isolate,
&RuntimeCallStats::RecompileSynchronous);
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(kOptimizationDisabled);
} else if (compilation_info->dependencies()->HasAborted()) {
job->RetryOptimization(kBailedOutDueToDependencyChange);
} else if (job->FinalizeJob() == CompilationJob::SUCCEEDED) {
job->RecordOptimizedCompilationStats();
RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG,
job->parse_info()->script(), compilation_info);
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(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->code());
// Clear the InOptimizationQueue marker, if it exists.
if (compilation_info->closure()->IsInOptimizationQueue()) {
compilation_info->closure()->ClearOptimizationMarker();
}
return CompilationJob::FAILED;
}
MaybeHandle<SharedFunctionInfo> CompileToplevel(ParseInfo* parse_info,
Isolate* isolate) {
TimerEventScope<TimerEventCompileCode> top_level_timer(isolate);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileCode");
PostponeInterruptsScope postpone(isolate);
DCHECK(!isolate->native_context().is_null());
RuntimeCallTimerScope runtimeTimer(
isolate, parse_info->is_eval() ? &RuntimeCallStats::CompileEval
: &RuntimeCallStats::CompileScript);
Handle<Script> script = parse_info->script();
Handle<SharedFunctionInfo> result;
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.
std::forward_list<std::unique_ptr<CompilationJob>> inner_function_jobs;
std::unique_ptr<CompilationJob> outer_function_job(
GenerateUnoptimizedCode(parse_info, isolate, &inner_function_jobs));
if (!outer_function_job) {
if (!isolate->has_pending_exception()) isolate->StackOverflow();
return MaybeHandle<SharedFunctionInfo>();
}
// 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());
shared_info->set_is_toplevel(true);
// Finalize compilation of the unoptimized bytecode or asm-js data.
if (!FinalizeUnoptimizedCode(parse_info, isolate, shared_info,
outer_function_job.get(),
&inner_function_jobs)) {
if (!isolate->has_pending_exception()) isolate->StackOverflow();
return MaybeHandle<SharedFunctionInfo>();
}
if (!script.is_null()) {
script->set_compilation_state(Script::COMPILATION_STATE_COMPILED);
}
return shared_info;
}
bool FailWithPendingException(Isolate* isolate,
Compiler::ClearExceptionFlag flag) {
if (flag == Compiler::CLEAR_EXCEPTION) {
isolate->clear_pending_exception();
} else if (!isolate->has_pending_exception()) {
isolate->StackOverflow();
}
return false;
}
} // namespace
// ----------------------------------------------------------------------------
// Implementation of Compiler
bool Compiler::Analyze(ParseInfo* parse_info,
EagerInnerFunctionLiterals* eager_literals) {
DCHECK_NOT_NULL(parse_info->literal());
RuntimeCallTimerScope runtimeTimer(parse_info->runtime_call_stats(),
&RuntimeCallStats::CompileAnalyse);
if (!Rewriter::Rewrite(parse_info)) return false;
DeclarationScope::Analyze(parse_info);
if (!Renumber(parse_info, eager_literals)) 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);
}
bool Compiler::Compile(Handle<SharedFunctionInfo> shared_info,
ClearExceptionFlag flag) {
// We should never reach here if the function is already compiled.
DCHECK(!shared_info->is_compiled());
Isolate* isolate = shared_info->GetIsolate();
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,
&RuntimeCallStats::CompileFunction);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileCode");
AggregatedHistogramTimerScope timer(isolate->counters()->compile_lazy());
// 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, flag);
}
return true;
}
// Set up parse info.
ParseInfo parse_info(shared_info);
parse_info.set_lazy_compile();
if (FLAG_preparser_scope_analysis) {
if (shared_info->HasPreParsedScopeData()) {
Handle<PreParsedScopeData> data(
PreParsedScopeData::cast(shared_info->preparsed_scope_data()));
parse_info.consumed_preparsed_scope_data()->SetData(data);
// After we've compiled the function, we don't need data about its
// skippable functions any more.
shared_info->set_preparsed_scope_data(isolate->heap()->null_value());
}
}
// Parse and update ParseInfo with the results.
if (!parsing::ParseFunction(&parse_info, shared_info, isolate)) {
return FailWithPendingException(isolate, flag);
}
// Generate the unoptimized bytecode or asm-js data.
std::forward_list<std::unique_ptr<CompilationJob>> inner_function_jobs;
std::unique_ptr<CompilationJob> outer_function_job(
GenerateUnoptimizedCode(&parse_info, isolate, &inner_function_jobs));
if (!outer_function_job) {
return FailWithPendingException(isolate, 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, flag);
}
DCHECK(!isolate->has_pending_exception());
return true;
}
bool Compiler::Compile(Handle<JSFunction> function, ClearExceptionFlag flag) {
// 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());
Isolate* isolate = function->GetIsolate();
Handle<SharedFunctionInfo> shared_info = handle(function->shared());
DCHECK(AllowCompilation::IsAllowed(isolate));
// Ensure shared function info is compiled.
if (!shared_info->is_compiled() && !Compile(shared_info, flag)) return false;
Handle<Code> code = handle(shared_info->code(), isolate);
// Allocate literals for the JSFunction.
JSFunction::EnsureLiterals(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::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());
code = handle(function->shared()->code(), isolate);
}
// 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<JSArray> Compiler::CompileForLiveEdit(Handle<Script> script) {
Isolate* isolate = script->GetIsolate();
DCHECK(AllowCompilation::IsAllowed(isolate));
// In order to ensure that live edit function info collection finds the newly
// generated shared function infos, clear the script's list temporarily
// and restore it at the end of this method.
Handle<FixedArray> old_function_infos(script->shared_function_infos(),
isolate);
script->set_shared_function_infos(isolate->heap()->empty_fixed_array());
// Start a compilation.
ParseInfo parse_info(script);
parse_info.set_eager();
// TODO(635): support extensions.
Handle<JSArray> infos;
Handle<SharedFunctionInfo> shared_info;
if (CompileToplevel(&parse_info, isolate).ToHandle(&shared_info)) {
// Check postconditions on success.
DCHECK(!isolate->has_pending_exception());
infos = LiveEditFunctionTracker::Collect(parse_info.literal(), script,
parse_info.zone(), isolate);
}
// Restore the original function info list in order to remain side-effect
// free as much as possible, since some code expects the old shared function
// infos to stick around.
script->set_shared_function_infos(*old_function_infos);
return infos;
}
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, int line_offset,
int column_offset, Handle<Object> script_name,
ScriptOriginOptions options) {
Isolate* isolate = source->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.
int position = eval_scope_position;
if (FLAG_harmony_function_tostring &&
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);
position = -parameters_end_pos;
}
CompilationCache* compilation_cache = isolate->compilation_cache();
InfoVectorPair eval_result = compilation_cache->LookupEval(
source, outer_info, context, language_mode, position);
Handle<Cell> vector;
if (eval_result.has_vector()) {
vector = Handle<Cell>(eval_result.vector(), isolate);
}
Handle<SharedFunctionInfo> shared_info;
Handle<Script> script;
if (eval_result.has_shared()) {
shared_info = Handle<SharedFunctionInfo>(eval_result.shared(), isolate);
script = Handle<Script>(Script::cast(shared_info->script()), isolate);
} else {
script = isolate->factory()->NewScript(source);
if (isolate->NeedsSourcePositionsForProfiling()) {
Script::InitLineEnds(script);
}
if (!script_name.is_null()) {
script->set_name(*script_name);
script->set_line_offset(line_offset);
script->set_column_offset(column_offset);
}
script->set_origin_options(options);
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(script->GetIsolate());
if (!it.done() && it.is_javascript()) {
FrameSummary summary = FrameSummary::GetTop(it.javascript_frame());
script->set_eval_from_shared(
summary.AsJavaScript().function()->shared());
eval_position = -summary.code_offset();
} else {
eval_position = 0;
}
}
script->set_eval_from_position(eval_position);
ParseInfo parse_info(script);
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()));
}
if (!CompileToplevel(&parse_info, isolate).ToHandle(&shared_info)) {
return MaybeHandle<JSFunction>();
}
}
// 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_vector()) {
result = isolate->factory()->NewFunctionFromSharedFunctionInfo(
shared_info, context, vector, NOT_TENURED);
} else {
result = isolate->factory()->NewFunctionFromSharedFunctionInfo(
shared_info, context, NOT_TENURED);
JSFunction::EnsureLiterals(result);
// Make sure to cache this result.
Handle<Cell> new_vector(result->feedback_vector_cell(), isolate);
compilation_cache->PutEval(source, outer_info, context, shared_info,
new_vector, eval_scope_position);
}
} else {
result = isolate->factory()->NewFunctionFromSharedFunctionInfo(
shared_info, context, NOT_TENURED);
JSFunction::EnsureLiterals(result);
// Add the SharedFunctionInfo and the LiteralsArray to the eval cache if
// we didn't retrieve from there.
Handle<Cell> vector(result->feedback_vector_cell(), isolate);
compilation_cache->PutEval(source, outer_info, context, shared_info, vector,
eval_scope_position);
}
// OnAfterCompile has to be called after we create the JSFunction, which we
// may require to recompile the eval for debugging, if we find a function
// that contains break points in the eval script.
isolate->debug()->OnAfterCompile(script);
return result;
}
namespace {
bool ContainsAsmModule(Handle<Script> script) {
DisallowHeapAllocation no_gc;
SharedFunctionInfo::ScriptIterator iter(script);
while (SharedFunctionInfo* info = iter.Next()) {
if (info->HasAsmWasmData()) return true;
}
return false;
}
bool ShouldProduceCodeCache(ScriptCompiler::CompileOptions options) {
return options == ScriptCompiler::kProduceCodeCache ||
options == ScriptCompiler::kProduceFullCodeCache;
}
} // namespace
bool Compiler::CodeGenerationFromStringsAllowed(Isolate* isolate,
Handle<Context> context,
Handle<String> source) {
DCHECK(context->allow_code_gen_from_strings()->IsFalse(isolate));
// Check with callback if set.
AllowCodeGenerationFromStringsCallback callback =
isolate->allow_code_gen_callback();
if (callback == NULL) {
// No callback set and code generation disallowed.
return false;
} else {
// Callback set. Let it decide if code generation is allowed.
VMState<EXTERNAL> state(isolate);
return callback(v8::Utils::ToLocal(context), v8::Utils::ToLocal(source));
}
}
MaybeHandle<JSFunction> Compiler::GetFunctionFromString(
Handle<Context> context, Handle<String> source,
ParseRestriction restriction, int parameters_end_pos) {
Isolate* const isolate = context->GetIsolate();
Handle<Context> native_context(context->native_context(), isolate);
// Check if native context allows code generation from
// strings. Throw an exception if it doesn't.
if (native_context->allow_code_gen_from_strings()->IsFalse(isolate) &&
!CodeGenerationFromStringsAllowed(isolate, native_context, source)) {
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->closure()->shared());
return Compiler::GetFunctionFromEval(source, outer_info, native_context,
SLOPPY, restriction, parameters_end_pos,
eval_scope_position, eval_position);
}
Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForScript(
Handle<String> source, Handle<Object> script_name, int line_offset,
int column_offset, ScriptOriginOptions resource_options,
Handle<Object> source_map_url, Handle<Context> context,
v8::Extension* extension, ScriptData** cached_data,
ScriptCompiler::CompileOptions compile_options, NativesFlag natives,
Handle<FixedArray> host_defined_options) {
Isolate* isolate = source->GetIsolate();
if (compile_options == ScriptCompiler::kNoCompileOptions) {
cached_data = NULL;
} else if (compile_options == ScriptCompiler::kProduceParserCache ||
ShouldProduceCodeCache(compile_options)) {
DCHECK(cached_data && !*cached_data);
DCHECK(extension == NULL);
DCHECK(!isolate->debug()->is_loaded());
} else {
DCHECK(compile_options == ScriptCompiler::kConsumeParserCache ||
compile_options == ScriptCompiler::kConsumeCodeCache);
DCHECK(cached_data && *cached_data);
DCHECK(extension == NULL);
}
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.
Handle<SharedFunctionInfo> result;
Handle<Cell> vector;
if (extension == NULL) {
// First check per-isolate compilation cache.
InfoVectorPair pair = compilation_cache->LookupScript(
source, script_name, line_offset, column_offset, resource_options,
context, language_mode);
if (!pair.has_shared() &&
compile_options == ScriptCompiler::kConsumeCodeCache &&
!isolate->debug()->is_loaded()) {
// Then check cached code provided by embedder.
HistogramTimerScope timer(isolate->counters()->compile_deserialize());
RuntimeCallTimerScope runtimeTimer(isolate,
&RuntimeCallStats::CompileDeserialize);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.CompileDeserialize");
Handle<SharedFunctionInfo> inner_result;
if (CodeSerializer::Deserialize(isolate, *cached_data, source)
.ToHandle(&inner_result)) {
// Promote to per-isolate compilation cache.
DCHECK(inner_result->is_compiled());
Handle<FeedbackVector> feedback_vector =
FeedbackVector::New(isolate, inner_result);
vector = isolate->factory()->NewCell(feedback_vector);
compilation_cache->PutScript(source, context, language_mode,
inner_result, vector);
Handle<Script> script(Script::cast(inner_result->script()), isolate);
isolate->debug()->OnAfterCompile(script);
return inner_result;
}
// Deserializer failed. Fall through to compile.
} else {
if (pair.has_shared()) {
result = Handle<SharedFunctionInfo>(pair.shared(), isolate);
}
if (pair.has_vector()) {
vector = Handle<Cell>(pair.vector(), isolate);
}
}
}
base::ElapsedTimer timer;
if (FLAG_profile_deserialization && ShouldProduceCodeCache(compile_options)) {
timer.Start();
}
if (result.is_null() || ShouldProduceCodeCache(compile_options)) {
// No cache entry found, or embedder wants a code cache. Compile the script.
// Create a script object describing the script to be compiled.
Handle<Script> script = isolate->factory()->NewScript(source);
if (isolate->NeedsSourcePositionsForProfiling()) {
Script::InitLineEnds(script);
}
if (natives == NATIVES_CODE) {
script->set_type(Script::TYPE_NATIVE);
} else if (natives == EXTENSION_CODE) {
script->set_type(Script::TYPE_EXTENSION);
} else if (natives == INSPECTOR_CODE) {
script->set_type(Script::TYPE_INSPECTOR);
}
if (!script_name.is_null()) {
script->set_name(*script_name);
script->set_line_offset(line_offset);
script->set_column_offset(column_offset);
}
script->set_origin_options(resource_options);
if (!source_map_url.is_null()) {
script->set_source_mapping_url(*source_map_url);
}
if (!host_defined_options.is_null()) {
script->set_host_defined_options(*host_defined_options);
}
// Compile the function and add it to the cache.
ParseInfo parse_info(script);
Zone compile_zone(isolate->allocator(), ZONE_NAME);
if (resource_options.IsModule()) parse_info.set_module();
if (compile_options != ScriptCompiler::kNoCompileOptions) {
parse_info.set_cached_data(cached_data);
}
parse_info.set_compile_options(compile_options);
parse_info.set_extension(extension);
if (!context->IsNativeContext()) {
parse_info.set_outer_scope_info(handle(context->scope_info()));
}
if (ShouldProduceCodeCache(compile_options)) {
parse_info.set_will_serialize();
parse_info.set_eager(compile_options ==
ScriptCompiler::kProduceFullCodeCache);
}
parse_info.set_language_mode(
static_cast<LanguageMode>(parse_info.language_mode() | language_mode));
CompileToplevel(&parse_info, isolate).ToHandle(&result);
if (extension == NULL && !result.is_null()) {
// We need a feedback vector.
DCHECK(result->is_compiled());
Handle<FeedbackVector> feedback_vector =
FeedbackVector::New(isolate, result);
vector = isolate->factory()->NewCell(feedback_vector);
compilation_cache->PutScript(source, context, language_mode, result,
vector);
if (ShouldProduceCodeCache(compile_options) &&
!ContainsAsmModule(script)) {
HistogramTimerScope histogram_timer(
isolate->counters()->compile_serialize());
RuntimeCallTimerScope runtimeTimer(isolate,
&RuntimeCallStats::CompileSerialize);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.CompileSerialize");
*cached_data = CodeSerializer::Serialize(isolate, result, source);
if (FLAG_profile_deserialization) {
PrintF("[Compiling and serializing took %0.3f ms]\n",
timer.Elapsed().InMillisecondsF());
}
}
}
if (result.is_null()) {
if (natives != EXTENSION_CODE && natives != NATIVES_CODE) {
isolate->ReportPendingMessages();
}
} else {
isolate->debug()->OnAfterCompile(script);
}
}
return result;
}
Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForStreamedScript(
Handle<Script> script, ParseInfo* parse_info, int source_length) {
Isolate* isolate = script->GetIsolate();
// TODO(titzer): increment the counters in caller.
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);
parse_info->set_language_mode(
static_cast<LanguageMode>(parse_info->language_mode() | language_mode));
Handle<SharedFunctionInfo> result;
if (CompileToplevel(parse_info, isolate).ToHandle(&result)) {
isolate->debug()->OnAfterCompile(script);
}
return 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)) {
DCHECK(!existing->is_toplevel());
return existing;
}
// Allocate a shared function info object which will be compiled lazily.
Handle<SharedFunctionInfo> result =
isolate->factory()->NewSharedFunctionInfoForLiteral(literal, script);
result->set_is_toplevel(false);
Scope* outer_scope = literal->scope()->GetOuterScopeWithContext();
if (outer_scope) {
result->set_outer_scope_info(*outer_scope->scope_info());
}
return result;
}
Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForNative(
v8::Extension* extension, Handle<String> name) {
Isolate* isolate = name->GetIsolate();
v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
// Compute the function template for the native function.
v8::Local<v8::FunctionTemplate> fun_template =
extension->GetNativeFunctionTemplate(v8_isolate,
v8::Utils::ToLocal(name));
DCHECK(!fun_template.IsEmpty());
// Instantiate the function and create a shared function info from it.
Handle<JSFunction> fun = Handle<JSFunction>::cast(Utils::OpenHandle(
*fun_template->GetFunction(v8_isolate->GetCurrentContext())
.ToLocalChecked()));
Handle<Code> code = Handle<Code>(fun->shared()->code());
Handle<Code> construct_stub = Handle<Code>(fun->shared()->construct_stub());
Handle<SharedFunctionInfo> shared = isolate->factory()->NewSharedFunctionInfo(
name, FunctionKind::kNormalFunction, code,
Handle<ScopeInfo>(fun->shared()->scope_info()));
shared->set_outer_scope_info(fun->shared()->outer_scope_info());
shared->SetConstructStub(*construct_stub);
shared->set_feedback_metadata(fun->shared()->feedback_metadata());
// Copy the function data to the shared function info.
shared->set_function_data(fun->shared()->function_data());
int parameters = fun->shared()->internal_formal_parameter_count();
shared->set_internal_formal_parameter_count(parameters);
return shared;
}
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);
}
CompilationJob* Compiler::PrepareUnoptimizedCompilationJob(
ParseInfo* parse_info, Isolate* isolate) {
VMState<BYTECODE_COMPILER> state(isolate);
std::unique_ptr<CompilationJob> job(
interpreter::Interpreter::NewCompilationJob(
parse_info, parse_info->literal(), isolate));
if (job->PrepareJob() != CompilationJob::SUCCEEDED) {
return nullptr;
}
return job.release();
}
bool Compiler::FinalizeCompilationJob(CompilationJob* raw_job) {
// Take ownership of compilation job. Deleting job also tears down the zone.
std::unique_ptr<CompilationJob> job(raw_job);
if (job->compilation_info()->IsOptimizing()) {
VMState<COMPILER> state(job->compilation_info()->isolate());
return FinalizeOptimizedCompilationJob(job.get()) ==
CompilationJob::SUCCEEDED;
} else {
VMState<BYTECODE_COMPILER> state(job->compilation_info()->isolate());
return FinalizeUnoptimizedCompilationJob(job.get()) ==
CompilationJob::SUCCEEDED;
}
}
void Compiler::PostInstantiation(Handle<JSFunction> function,
PretenureFlag pretenure) {
Handle<SharedFunctionInfo> shared(function->shared());
if (FLAG_always_opt && shared->allows_lazy_compilation() &&
!shared->optimization_disabled() && !shared->HasAsmWasmData() &&
shared->is_compiled()) {
// TODO(mvstanton): pass pretenure flag to EnsureLiterals.
JSFunction::EnsureLiterals(function);
if (!function->IsOptimized()) {
// Only mark for optimization if we don't already have optimized code.
if (!function->HasOptimizedCode()) {
function->MarkForOptimization(ConcurrencyMode::kNotConcurrent);
}
}
}
if (shared->is_compiled()) {
// TODO(mvstanton): pass pretenure flag to EnsureLiterals.
JSFunction::EnsureLiterals(function);
Code* code = function->feedback_vector()->optimized_code();
if (code != nullptr) {
// Caching of optimized code enabled and optimized code found.
DCHECK(!code->marked_for_deoptimization());
DCHECK(function->shared()->is_compiled());
function->set_code(code);
}
}
}
} // namespace internal
} // namespace v8