mirrored from https://chromium.googlesource.com/v8/v8.git
/
compiler.cc
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compiler.cc
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// 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 "src/ast/ast-numbering.h"
#include "src/ast/prettyprinter.h"
#include "src/ast/scopeinfo.h"
#include "src/ast/scopes.h"
#include "src/bootstrapper.h"
#include "src/codegen.h"
#include "src/compilation-cache.h"
#include "src/compiler/pipeline.h"
#include "src/crankshaft/hydrogen.h"
#include "src/debug/debug.h"
#include "src/debug/liveedit.h"
#include "src/deoptimizer.h"
#include "src/frames-inl.h"
#include "src/full-codegen/full-codegen.h"
#include "src/interpreter/interpreter.h"
#include "src/isolate-inl.h"
#include "src/log-inl.h"
#include "src/messages.h"
#include "src/parsing/parser.h"
#include "src/parsing/rewriter.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/profiler/cpu-profiler.h"
#include "src/runtime-profiler.h"
#include "src/snapshot/code-serializer.h"
#include "src/typing-asm.h"
#include "src/vm-state-inl.h"
namespace v8 {
namespace internal {
#define PARSE_INFO_GETTER(type, name) \
type CompilationInfo::name() const { \
CHECK(parse_info()); \
return parse_info()->name(); \
}
#define PARSE_INFO_GETTER_WITH_DEFAULT(type, name, def) \
type CompilationInfo::name() const { \
return parse_info() ? parse_info()->name() : def; \
}
PARSE_INFO_GETTER(Handle<Script>, script)
PARSE_INFO_GETTER(FunctionLiteral*, literal)
PARSE_INFO_GETTER_WITH_DEFAULT(Scope*, scope, nullptr)
PARSE_INFO_GETTER_WITH_DEFAULT(Handle<Context>, context,
Handle<Context>::null())
PARSE_INFO_GETTER(Handle<SharedFunctionInfo>, shared_info)
#undef PARSE_INFO_GETTER
#undef PARSE_INFO_GETTER_WITH_DEFAULT
// A wrapper around a CompilationInfo that detaches the Handles from
// the underlying DeferredHandleScope and stores them in info_ on
// destruction.
class CompilationHandleScope BASE_EMBEDDED {
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 CompilationInfo
bool CompilationInfo::has_shared_info() const {
return parse_info_ && !parse_info_->shared_info().is_null();
}
CompilationInfo::CompilationInfo(ParseInfo* parse_info,
Handle<JSFunction> closure)
: CompilationInfo(parse_info, {}, Code::ComputeFlags(Code::FUNCTION), BASE,
parse_info->isolate(), parse_info->zone()) {
closure_ = closure;
// Compiling for the snapshot typically results in different code than
// compiling later on. This means that code recompiled with deoptimization
// support won't be "equivalent" (as defined by SharedFunctionInfo::
// EnableDeoptimizationSupport), so it will replace the old code and all
// its type feedback. To avoid this, always compile functions in the snapshot
// with deoptimization support.
if (isolate_->serializer_enabled()) EnableDeoptimizationSupport();
if (FLAG_function_context_specialization) MarkAsFunctionContextSpecializing();
if (FLAG_turbo_inlining) MarkAsInliningEnabled();
if (FLAG_turbo_source_positions) MarkAsSourcePositionsEnabled();
if (FLAG_turbo_splitting) MarkAsSplittingEnabled();
}
CompilationInfo::CompilationInfo(Vector<const char> debug_name,
Isolate* isolate, Zone* zone,
Code::Flags code_flags)
: CompilationInfo(nullptr, debug_name, code_flags, STUB, isolate, zone) {}
CompilationInfo::CompilationInfo(ParseInfo* parse_info,
Vector<const char> debug_name,
Code::Flags code_flags, Mode mode,
Isolate* isolate, Zone* zone)
: parse_info_(parse_info),
isolate_(isolate),
flags_(0),
code_flags_(code_flags),
mode_(mode),
osr_ast_id_(BailoutId::None()),
zone_(zone),
deferred_handles_(nullptr),
dependencies_(isolate, zone),
bailout_reason_(kNoReason),
prologue_offset_(Code::kPrologueOffsetNotSet),
track_positions_(FLAG_hydrogen_track_positions ||
isolate->is_profiling()),
parameter_count_(0),
optimization_id_(-1),
osr_expr_stack_height_(0),
debug_name_(debug_name) {}
CompilationInfo::~CompilationInfo() {
DisableFutureOptimization();
dependencies()->Rollback();
delete deferred_handles_;
}
int CompilationInfo::num_parameters() const {
return !IsStub() ? scope()->num_parameters() : parameter_count_;
}
int CompilationInfo::num_parameters_including_this() const {
return num_parameters() + (is_this_defined() ? 1 : 0);
}
bool CompilationInfo::is_this_defined() const { return !IsStub(); }
// Primitive functions are unlikely to be picked up by the stack-walking
// profiler, so they trigger their own optimization when they're called
// for the SharedFunctionInfo::kCallsUntilPrimitiveOptimization-th time.
bool CompilationInfo::ShouldSelfOptimize() {
return FLAG_crankshaft &&
!(literal()->flags() & AstProperties::kDontSelfOptimize) &&
!literal()->dont_optimize() &&
literal()->scope()->AllowsLazyCompilation() &&
!shared_info()->optimization_disabled();
}
bool CompilationInfo::has_simple_parameters() {
return scope()->has_simple_parameters();
}
base::SmartArrayPointer<char> CompilationInfo::GetDebugName() const {
if (parse_info() && parse_info()->literal()) {
AllowHandleDereference allow_deref;
return parse_info()->literal()->debug_name()->ToCString();
}
if (parse_info() && !parse_info()->shared_info().is_null()) {
return parse_info()->shared_info()->DebugName()->ToCString();
}
Vector<const char> name_vec = debug_name_;
if (name_vec.is_empty()) name_vec = ArrayVector("unknown");
base::SmartArrayPointer<char> name(new char[name_vec.length() + 1]);
memcpy(name.get(), name_vec.start(), name_vec.length());
name[name_vec.length()] = '\0';
return name;
}
StackFrame::Type CompilationInfo::GetOutputStackFrameType() const {
switch (output_code_kind()) {
case Code::STUB:
case Code::BYTECODE_HANDLER:
case Code::HANDLER:
case Code::BUILTIN:
#define CASE_KIND(kind) case Code::kind:
IC_KIND_LIST(CASE_KIND)
#undef CASE_KIND
return StackFrame::STUB;
case Code::WASM_FUNCTION:
return StackFrame::WASM;
case Code::JS_TO_WASM_FUNCTION:
return StackFrame::JS_TO_WASM;
case Code::WASM_TO_JS_FUNCTION:
return StackFrame::WASM_TO_JS;
default:
UNIMPLEMENTED();
return StackFrame::NONE;
}
}
int CompilationInfo::GetDeclareGlobalsFlags() const {
DCHECK(DeclareGlobalsLanguageMode::is_valid(parse_info()->language_mode()));
return DeclareGlobalsEvalFlag::encode(parse_info()->is_eval()) |
DeclareGlobalsNativeFlag::encode(parse_info()->is_native()) |
DeclareGlobalsLanguageMode::encode(parse_info()->language_mode());
}
bool CompilationInfo::ExpectsJSReceiverAsReceiver() {
return is_sloppy(parse_info()->language_mode()) && !parse_info()->is_native();
}
#if DEBUG
void CompilationInfo::PrintAstForTesting() {
PrintF("--- Source from AST ---\n%s\n",
PrettyPrinter(isolate()).PrintProgram(literal()));
}
#endif
// ----------------------------------------------------------------------------
// Implementation of CompilationJob
CompilationJob::Status CompilationJob::CreateGraph() {
DisallowJavascriptExecution no_js(isolate());
DCHECK(info()->IsOptimizing());
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[compiling method " << Brief(*info()->closure()) << " using "
<< compiler_name_;
if (info()->is_osr()) os << " OSR";
os << "]" << std::endl;
}
// Delegate to the underlying implementation.
DCHECK_EQ(SUCCEEDED, last_status());
ScopedTimer t(&time_taken_to_create_graph_);
return SetLastStatus(CreateGraphImpl());
}
CompilationJob::Status CompilationJob::OptimizeGraph() {
DisallowHeapAllocation no_allocation;
DisallowHandleAllocation no_handles;
DisallowHandleDereference no_deref;
DisallowCodeDependencyChange no_dependency_change;
// Delegate to the underlying implementation.
DCHECK_EQ(SUCCEEDED, last_status());
ScopedTimer t(&time_taken_to_optimize_);
return SetLastStatus(OptimizeGraphImpl());
}
CompilationJob::Status CompilationJob::GenerateCode() {
DisallowCodeDependencyChange no_dependency_change;
DisallowJavascriptExecution no_js(isolate());
DCHECK(!info()->dependencies()->HasAborted());
// Delegate to the underlying implementation.
DCHECK_EQ(SUCCEEDED, last_status());
ScopedTimer t(&time_taken_to_codegen_);
return SetLastStatus(GenerateCodeImpl());
}
namespace {
void AddWeakObjectToCodeDependency(Isolate* isolate, Handle<HeapObject> object,
Handle<Code> code) {
Handle<WeakCell> cell = Code::WeakCellFor(code);
Heap* heap = isolate->heap();
Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(object));
dep = DependentCode::InsertWeakCode(dep, DependentCode::kWeakCodeGroup, cell);
heap->AddWeakObjectToCodeDependency(object, dep);
}
} // namespace
void CompilationJob::RegisterWeakObjectsInOptimizedCode(Handle<Code> code) {
// TODO(turbofan): Move this to pipeline.cc once Crankshaft dies.
Isolate* const isolate = code->GetIsolate();
DCHECK(code->is_optimized_code());
std::vector<Handle<Map>> maps;
std::vector<Handle<HeapObject>> objects;
{
DisallowHeapAllocation no_gc;
int const mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
RelocInfo::ModeMask(RelocInfo::CELL);
for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
RelocInfo::Mode mode = it.rinfo()->rmode();
if (mode == RelocInfo::CELL &&
code->IsWeakObjectInOptimizedCode(it.rinfo()->target_cell())) {
objects.push_back(handle(it.rinfo()->target_cell(), isolate));
} else if (mode == RelocInfo::EMBEDDED_OBJECT &&
code->IsWeakObjectInOptimizedCode(
it.rinfo()->target_object())) {
Handle<HeapObject> object(HeapObject::cast(it.rinfo()->target_object()),
isolate);
if (object->IsMap()) {
maps.push_back(Handle<Map>::cast(object));
} else {
objects.push_back(object);
}
}
}
}
for (Handle<Map> map : maps) {
if (map->dependent_code()->IsEmpty(DependentCode::kWeakCodeGroup)) {
isolate->heap()->AddRetainedMap(map);
}
Map::AddDependentCode(map, DependentCode::kWeakCodeGroup, code);
}
for (Handle<HeapObject> object : objects) {
AddWeakObjectToCodeDependency(isolate, object, code);
}
code->set_can_have_weak_objects(true);
}
void CompilationJob::RecordOptimizationStats() {
Handle<JSFunction> function = info()->closure();
if (!function->IsOptimized()) {
// Concurrent recompilation and OSR may race. Increment only once.
int opt_count = function->shared()->opt_count();
function->shared()->set_opt_count(opt_count + 1);
}
double ms_creategraph = time_taken_to_create_graph_.InMillisecondsF();
double ms_optimize = time_taken_to_optimize_.InMillisecondsF();
double ms_codegen = time_taken_to_codegen_.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);
}
if (FLAG_hydrogen_stats) {
isolate()->GetHStatistics()->IncrementSubtotals(time_taken_to_create_graph_,
time_taken_to_optimize_,
time_taken_to_codegen_);
}
}
// ----------------------------------------------------------------------------
// Local helper methods that make up the compilation pipeline.
namespace {
bool IsEvalToplevel(Handle<SharedFunctionInfo> shared) {
return shared->is_toplevel() && shared->script()->IsScript() &&
Script::cast(shared->script())->compilation_type() ==
Script::COMPILATION_TYPE_EVAL;
}
void RecordFunctionCompilation(Logger::LogEventsAndTags tag,
CompilationInfo* 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 (info->isolate()->logger()->is_logging_code_events() ||
info->isolate()->is_profiling()) {
Handle<SharedFunctionInfo> shared = info->shared_info();
Handle<Script> script = info->parse_info()->script();
Handle<AbstractCode> abstract_code =
info->has_bytecode_array()
? Handle<AbstractCode>::cast(info->bytecode_array())
: Handle<AbstractCode>::cast(info->code());
if (abstract_code.is_identical_to(
info->isolate()->builtins()->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())
: info->isolate()->heap()->empty_string();
Logger::LogEventsAndTags log_tag = Logger::ToNativeByScript(tag, *script);
PROFILE(info->isolate(),
CodeCreateEvent(log_tag, *abstract_code, *shared, script_name,
line_num, column_num));
}
}
void EnsureFeedbackMetadata(CompilationInfo* info) {
DCHECK(info->has_shared_info());
// If no type feedback metadata exists, we create it now. 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 (info->shared_info()->feedback_metadata()->length() == 0 ||
!info->shared_info()->is_compiled()) {
Handle<TypeFeedbackMetadata> feedback_metadata = TypeFeedbackMetadata::New(
info->isolate(), info->literal()->feedback_vector_spec());
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(!info->shared_info()->feedback_metadata()->SpecDiffersFrom(
info->literal()->feedback_vector_spec()));
}
bool UseIgnition(CompilationInfo* info) {
DCHECK(info->has_shared_info());
// When requesting debug code as a replacement for existing code, we provide
// the same kind as the existing code (to prevent implicit tier-change).
if (info->is_debug() && info->shared_info()->is_compiled()) {
return info->shared_info()->HasBytecodeArray();
}
// For generator or async functions we might avoid Ignition wholesale.
if (info->shared_info()->is_resumable() && !FLAG_ignition_generators) {
return false;
}
// Since we can't OSR from Ignition, skip Ignition for asm.js functions.
if (info->shared_info()->asm_function()) {
return false;
}
// Checks whether top level functions should be passed by the filter.
if (info->shared_info()->is_toplevel()) {
Vector<const char> filter = CStrVector(FLAG_ignition_filter);
return (filter.length() == 0) || (filter.length() == 1 && filter[0] == '*');
}
// Finally respect the filter.
return info->shared_info()->PassesFilter(FLAG_ignition_filter);
}
int CodeAndMetadataSize(CompilationInfo* info) {
if (info->has_bytecode_array()) {
return info->bytecode_array()->SizeIncludingMetadata();
}
return info->code()->SizeIncludingMetadata();
}
bool GenerateUnoptimizedCode(CompilationInfo* info) {
bool success;
EnsureFeedbackMetadata(info);
if (FLAG_validate_asm && info->scope()->asm_module()) {
AsmTyper typer(info->isolate(), info->zone(), *(info->script()),
info->literal());
if (FLAG_enable_simd_asmjs) {
typer.set_allow_simd(true);
}
if (!typer.Validate()) {
DCHECK(!info->isolate()->has_pending_exception());
PrintF("Validation of asm.js module failed: %s", typer.error_message());
}
}
if (FLAG_ignition && UseIgnition(info)) {
success = interpreter::Interpreter::MakeBytecode(info);
} else {
success = FullCodeGenerator::MakeCode(info);
}
if (success) {
Isolate* isolate = info->isolate();
Counters* counters = isolate->counters();
// TODO(4280): Rename counters from "baseline" to "unoptimized" eventually.
counters->total_baseline_code_size()->Increment(CodeAndMetadataSize(info));
counters->total_baseline_compile_count()->Increment(1);
}
return success;
}
bool CompileUnoptimizedCode(CompilationInfo* info) {
DCHECK(AllowCompilation::IsAllowed(info->isolate()));
if (!Compiler::Analyze(info->parse_info()) ||
!GenerateUnoptimizedCode(info)) {
Isolate* isolate = info->isolate();
if (!isolate->has_pending_exception()) isolate->StackOverflow();
return false;
}
return true;
}
void InstallSharedScopeInfo(CompilationInfo* info,
Handle<SharedFunctionInfo> shared) {
Handle<ScopeInfo> scope_info =
ScopeInfo::Create(info->isolate(), info->zone(), info->scope());
shared->set_scope_info(*scope_info);
}
void InstallSharedCompilationResult(CompilationInfo* info,
Handle<SharedFunctionInfo> shared) {
// TODO(mstarzinger): Compiling for debug code might be used to reveal inner
// functions via {FindSharedFunctionInfoInScript}, in which case we end up
// regenerating existing bytecode. Fix this!
if (info->is_debug() && info->has_bytecode_array()) {
shared->ClearBytecodeArray();
}
// Assert that we are not overwriting (possibly patched) debug code.
DCHECK(!shared->HasDebugInfo());
DCHECK(!info->code().is_null());
shared->ReplaceCode(*info->code());
if (info->has_bytecode_array()) {
DCHECK(!shared->HasBytecodeArray()); // Only compiled once.
shared->set_bytecode_array(*info->bytecode_array());
}
}
MUST_USE_RESULT MaybeHandle<Code> GetUnoptimizedCode(CompilationInfo* info) {
VMState<COMPILER> state(info->isolate());
PostponeInterruptsScope postpone(info->isolate());
// Parse and update CompilationInfo with the results.
if (!Parser::ParseStatic(info->parse_info())) return MaybeHandle<Code>();
Handle<SharedFunctionInfo> shared = info->shared_info();
DCHECK_EQ(shared->language_mode(), info->literal()->language_mode());
// Compile either unoptimized code or bytecode for the interpreter.
if (!CompileUnoptimizedCode(info)) return MaybeHandle<Code>();
// Update the shared function info with the scope info.
InstallSharedScopeInfo(info, shared);
// Install compilation result on the shared function info
InstallSharedCompilationResult(info, shared);
// Record the function compilation event.
RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info);
return info->code();
}
MUST_USE_RESULT MaybeHandle<Code> GetCodeFromOptimizedCodeMap(
Handle<JSFunction> function, BailoutId osr_ast_id) {
Handle<SharedFunctionInfo> shared(function->shared());
DisallowHeapAllocation no_gc;
CodeAndLiterals cached = shared->SearchOptimizedCodeMap(
function->context()->native_context(), osr_ast_id);
if (cached.code != nullptr) {
// Caching of optimized code enabled and optimized code found.
if (cached.literals != nullptr) function->set_literals(cached.literals);
DCHECK(!cached.code->marked_for_deoptimization());
DCHECK(function->shared()->is_compiled());
return Handle<Code>(cached.code);
}
return MaybeHandle<Code>();
}
void InsertCodeIntoOptimizedCodeMap(CompilationInfo* info) {
Handle<Code> code = 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 (info->is_function_context_specializing()) return;
// Frame specialization implies function context specialization.
DCHECK(!info->is_frame_specializing());
// Cache optimized context-specific code.
Handle<JSFunction> function = info->closure();
Handle<SharedFunctionInfo> shared(function->shared());
Handle<LiteralsArray> literals(function->literals());
Handle<Context> native_context(function->context()->native_context());
SharedFunctionInfo::AddToOptimizedCodeMap(shared, native_context, code,
literals, info->osr_ast_id());
// Do not cache (native) context-independent code compiled for OSR.
if (code->is_turbofanned() && info->is_osr()) return;
// Cache optimized (native) context-independent code.
if (FLAG_turbo_cache_shared_code && code->is_turbofanned() &&
!info->is_native_context_specializing()) {
DCHECK(!info->is_function_context_specializing());
DCHECK(info->osr_ast_id().IsNone());
Handle<SharedFunctionInfo> shared(function->shared());
SharedFunctionInfo::AddSharedCodeToOptimizedCodeMap(shared, code);
}
}
bool Renumber(ParseInfo* parse_info) {
if (!AstNumbering::Renumber(parse_info->isolate(), parse_info->zone(),
parse_info->literal())) {
return false;
}
Handle<SharedFunctionInfo> shared_info = parse_info->shared_info();
if (!shared_info.is_null()) {
FunctionLiteral* lit = parse_info->literal();
shared_info->set_ast_node_count(lit->ast_node_count());
if (lit->dont_optimize_reason() != kNoReason) {
shared_info->DisableOptimization(lit->dont_optimize_reason());
}
shared_info->set_dont_crankshaft(
shared_info->dont_crankshaft() ||
(lit->flags() & AstProperties::kDontCrankshaft));
}
return true;
}
bool UseTurboFan(Handle<SharedFunctionInfo> shared) {
bool optimization_disabled = shared->optimization_disabled();
bool dont_crankshaft = shared->dont_crankshaft();
// Check the enabling conditions for Turbofan.
// 1. "use asm" code.
bool is_turbofanable_asm =
FLAG_turbo_asm && shared->asm_function() && !optimization_disabled;
// 2. Fallback for features unsupported by Crankshaft.
bool is_unsupported_by_crankshaft_but_turbofanable =
dont_crankshaft && strcmp(FLAG_turbo_filter, "~~") == 0 &&
!optimization_disabled;
// 3. Explicitly enabled by the command-line filter.
bool passes_turbo_filter = shared->PassesFilter(FLAG_turbo_filter);
return is_turbofanable_asm || is_unsupported_by_crankshaft_but_turbofanable ||
passes_turbo_filter;
}
bool GetOptimizedCodeNow(CompilationJob* job) {
CompilationInfo* info = job->info();
Isolate* isolate = info->isolate();
// Parsing is not required when optimizing from existing bytecode.
if (!info->is_optimizing_from_bytecode()) {
if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
EnsureFeedbackMetadata(info);
}
JSFunction::EnsureLiterals(info->closure());
TimerEventScope<TimerEventRecompileSynchronous> timer(isolate);
TRACE_EVENT0("v8", "V8.RecompileSynchronous");
if (job->CreateGraph() != CompilationJob::SUCCEEDED ||
job->OptimizeGraph() != CompilationJob::SUCCEEDED ||
job->GenerateCode() != CompilationJob::SUCCEEDED) {
if (FLAG_trace_opt) {
PrintF("[aborted optimizing ");
info->closure()->ShortPrint();
PrintF(" because: %s]\n", GetBailoutReason(info->bailout_reason()));
}
return false;
}
// Success!
job->RecordOptimizationStats();
DCHECK(!isolate->has_pending_exception());
InsertCodeIntoOptimizedCodeMap(info);
RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info);
return true;
}
bool GetOptimizedCodeLater(CompilationJob* job) {
CompilationInfo* info = job->info();
Isolate* isolate = info->isolate();
if (!isolate->optimizing_compile_dispatcher()->IsQueueAvailable()) {
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Compilation queue full, will retry optimizing ");
info->closure()->ShortPrint();
PrintF(" later.\n");
}
return false;
}
// 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.
CompilationHandleScope handle_scope(info);
// Parsing is not required when optimizing from existing bytecode.
if (!info->is_optimizing_from_bytecode()) {
if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
EnsureFeedbackMetadata(info);
}
JSFunction::EnsureLiterals(info->closure());
// Reopen handles in the new CompilationHandleScope.
info->ReopenHandlesInNewHandleScope();
info->parse_info()->ReopenHandlesInNewHandleScope();
TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
TRACE_EVENT0("v8", "V8.RecompileSynchronous");
if (job->CreateGraph() != CompilationJob::SUCCEEDED) return false;
isolate->optimizing_compile_dispatcher()->QueueForOptimization(job);
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Queued ");
info->closure()->ShortPrint();
PrintF(" for concurrent optimization.\n");
}
return true;
}
MaybeHandle<Code> GetOptimizedCode(Handle<JSFunction> function,
Compiler::ConcurrencyMode mode,
BailoutId osr_ast_id = BailoutId::None(),
JavaScriptFrame* osr_frame = nullptr) {
Isolate* isolate = function->GetIsolate();
Handle<SharedFunctionInfo> shared(function->shared(), isolate);
Handle<Code> cached_code;
if (GetCodeFromOptimizedCodeMap(function, osr_ast_id)
.ToHandle(&cached_code)) {
if (FLAG_trace_opt) {
PrintF("[found optimized code for ");
function->ShortPrint();
if (!osr_ast_id.IsNone()) {
PrintF(" at OSR AST id %d", osr_ast_id.ToInt());
}
PrintF("]\n");
}
return cached_code;
}
// Reset profiler ticks, function is no longer considered hot.
if (shared->is_compiled()) {
shared->code()->set_profiler_ticks(0);
}
VMState<COMPILER> state(isolate);
DCHECK(!isolate->has_pending_exception());
PostponeInterruptsScope postpone(isolate);
bool use_turbofan = UseTurboFan(shared);
base::SmartPointer<CompilationJob> job(
use_turbofan ? compiler::Pipeline::NewCompilationJob(function)
: new HCompilationJob(function));
CompilationInfo* info = job->info();
ParseInfo* parse_info = info->parse_info();
info->SetOptimizingForOsr(osr_ast_id, osr_frame);
// Do not use Crankshaft/TurboFan if we need to be able to set break points.
if (info->shared_info()->HasDebugInfo()) {
info->AbortOptimization(kFunctionBeingDebugged);
return MaybeHandle<Code>();
}
// Limit the number of times we try to optimize functions.
const int kMaxOptCount =
FLAG_deopt_every_n_times == 0 ? FLAG_max_opt_count : 1000;
if (info->shared_info()->opt_count() > kMaxOptCount) {
info->AbortOptimization(kOptimizedTooManyTimes);
return MaybeHandle<Code>();
}
CanonicalHandleScope canonical(isolate);
TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate);
TRACE_EVENT0("v8", "V8.OptimizeCode");
// TurboFan can optimize directly from existing bytecode.
if (FLAG_turbo_from_bytecode && use_turbofan &&
info->shared_info()->HasBytecodeArray()) {
info->MarkAsOptimizeFromBytecode();
}
if (IsEvalToplevel(shared)) {
parse_info->set_eval();
if (function->context()->IsNativeContext()) parse_info->set_global();
parse_info->set_toplevel();
parse_info->set_allow_lazy_parsing(false);
parse_info->set_lazy(false);
}
if (mode == Compiler::CONCURRENT) {
if (GetOptimizedCodeLater(job.get())) {
job.Detach(); // The background recompile job owns this now.
return isolate->builtins()->InOptimizationQueue();
}
} else {
if (GetOptimizedCodeNow(job.get())) return info->code();
}
if (isolate->has_pending_exception()) isolate->clear_pending_exception();
return MaybeHandle<Code>();
}
class InterpreterActivationsFinder : public ThreadVisitor,
public OptimizedFunctionVisitor {
public:
explicit InterpreterActivationsFinder(SharedFunctionInfo* shared)
: shared_(shared), has_activations_(false) {}
void VisitThread(Isolate* isolate, ThreadLocalTop* top) {
Address* activation_pc_address = nullptr;
JavaScriptFrameIterator it(isolate, top);
for (; !it.done(); it.Advance()) {
JavaScriptFrame* frame = it.frame();
if (!frame->is_interpreted()) continue;
if (frame->function()->shared() == shared_) {
has_activations_ = true;
activation_pc_address = frame->pc_address();
}
}
if (activation_pc_address) {
activation_pc_addresses_.push_back(activation_pc_address);
}
}
void VisitFunction(JSFunction* function) {
if (function->Inlines(shared_)) has_activations_ = true;
}
void EnterContext(Context* context) {}
void LeaveContext(Context* context) {}
bool MarkActivationsForBaselineOnReturn(Isolate* isolate) {
if (activation_pc_addresses_.empty()) return false;
for (Address* activation_pc_address : activation_pc_addresses_) {
DCHECK(isolate->inner_pointer_to_code_cache()
->GetCacheEntry(*activation_pc_address)
->code->is_interpreter_trampoline_builtin());
*activation_pc_address =
isolate->builtins()->InterpreterMarkBaselineOnReturn()->entry();
}
return true;
}
bool has_activations() { return has_activations_; }
private:
SharedFunctionInfo* shared_;
bool has_activations_;
std::vector<Address*> activation_pc_addresses_;
};
bool HasInterpreterActivations(
Isolate* isolate, InterpreterActivationsFinder* activations_finder) {
activations_finder->VisitThread(isolate, isolate->thread_local_top());
isolate->thread_manager()->IterateArchivedThreads(activations_finder);
if (FLAG_turbo_from_bytecode) {
// If we are able to optimize functions directly from bytecode, then there
// might be optimized functions that rely on bytecode being around. We need
// to prevent switching the given function to baseline code in those cases.
Deoptimizer::VisitAllOptimizedFunctions(isolate, activations_finder);
}
return activations_finder->has_activations();
}
MaybeHandle<Code> GetBaselineCode(Handle<JSFunction> function) {
Isolate* isolate = function->GetIsolate();
VMState<COMPILER> state(isolate);
PostponeInterruptsScope postpone(isolate);
Zone zone(isolate->allocator());
ParseInfo parse_info(&zone, function);
CompilationInfo info(&parse_info, function);
// Reset profiler ticks, function is no longer considered hot.
if (function->shared()->HasBytecodeArray()) {
function->shared()->set_profiler_ticks(0);
}
// Nothing left to do if the function already has baseline code.
if (function->shared()->code()->kind() == Code::FUNCTION) {
return Handle<Code>(function->shared()->code());
}
// We do not switch to baseline code when the debugger might have created a
// copy of the bytecode with break slots to be able to set break points.
if (function->shared()->HasDebugInfo()) {
return MaybeHandle<Code>();
}
// TODO(4280): For now we do not switch generators or async functions to
// baseline code because there might be suspended activations stored in
// generator objects on the heap. We could eventually go directly to
// TurboFan in this case.
if (function->shared()->is_resumable()) {
return MaybeHandle<Code>();
}
// TODO(4280): For now we disable switching to baseline code in the presence
// of interpreter activations of the given function. The reasons are:
// 1) The debugger assumes each function is either full-code or bytecode.
// 2) The underlying bytecode is cleared below, breaking stack unwinding.
InterpreterActivationsFinder activations_finder(function->shared());
if (HasInterpreterActivations(isolate, &activations_finder)) {
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[unable to switch " << Brief(*function) << " due to activations]"
<< std::endl;
}
if (activations_finder.MarkActivationsForBaselineOnReturn(isolate)) {
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[marking " << Brief(function->shared())
<< " for baseline recompilation on return]" << std::endl;
}
}
return MaybeHandle<Code>();
}
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[switching method " << Brief(*function) << " to baseline code]"
<< std::endl;
}
// Parse and update CompilationInfo with the results.
if (!Parser::ParseStatic(info.parse_info())) return MaybeHandle<Code>();
Handle<SharedFunctionInfo> shared = info.shared_info();
DCHECK_EQ(shared->language_mode(), info.literal()->language_mode());
// Compile baseline code using the full code generator.
if (!Compiler::Analyze(info.parse_info()) ||
!FullCodeGenerator::MakeCode(&info)) {
if (!isolate->has_pending_exception()) isolate->StackOverflow();
return MaybeHandle<Code>();
}
// TODO(4280): For now we play it safe and remove the bytecode array when we
// switch to baseline code. We might consider keeping around the bytecode so
// that it can be used as the "source of truth" eventually.
shared->ClearBytecodeArray();
// Update the shared function info with the scope info.
InstallSharedScopeInfo(&info, shared);
// Install compilation result on the shared function info
InstallSharedCompilationResult(&info, shared);
// Record the function compilation event.
RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, &info);
return info.code();
}
MaybeHandle<Code> GetLazyCode(Handle<JSFunction> function) {
Isolate* isolate = function->GetIsolate();
DCHECK(!isolate->has_pending_exception());
DCHECK(!function->is_compiled());
TimerEventScope<TimerEventCompileCode> compile_timer(isolate);
TRACE_EVENT0("v8", "V8.CompileCode");
AggregatedHistogramTimerScope timer(isolate->counters()->compile_lazy());
if (FLAG_turbo_cache_shared_code) {
Handle<Code> cached_code;
if (GetCodeFromOptimizedCodeMap(function, BailoutId::None())
.ToHandle(&cached_code)) {
if (FLAG_trace_opt) {
PrintF("[found optimized code for ");
function->ShortPrint();
PrintF(" during unoptimized compile]\n");
}
DCHECK(function->shared()->is_compiled());
return cached_code;
}
}
if (function->shared()->is_compiled()) {
return Handle<Code>(function->shared()->code());
}
Zone zone(isolate->allocator());
ParseInfo parse_info(&zone, function);
CompilationInfo info(&parse_info, function);
Handle<Code> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result, GetUnoptimizedCode(&info), Code);
if (FLAG_always_opt) {
Handle<Code> opt_code;
if (GetOptimizedCode(function, Compiler::NOT_CONCURRENT)
.ToHandle(&opt_code)) {
result = opt_code;
}
}
return result;