mirrored from https://chromium.googlesource.com/v8/v8.git
/
compiler.cc
1635 lines (1373 loc) · 59.9 KB
/
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-numbering.h"
#include "src/bootstrapper.h"
#include "src/codegen.h"
#include "src/compilation-cache.h"
#include "src/compiler/pipeline.h"
#include "src/cpu-profiler.h"
#include "src/debug.h"
#include "src/deoptimizer.h"
#include "src/full-codegen.h"
#include "src/gdb-jit.h"
#include "src/hydrogen.h"
#include "src/lithium.h"
#include "src/liveedit.h"
#include "src/messages.h"
#include "src/parser.h"
#include "src/prettyprinter.h"
#include "src/rewriter.h"
#include "src/runtime-profiler.h"
#include "src/scanner-character-streams.h"
#include "src/scopeinfo.h"
#include "src/scopes.h"
#include "src/snapshot/serialize.h"
#include "src/typing.h"
#include "src/vm-state-inl.h"
namespace v8 {
namespace internal {
std::ostream& operator<<(std::ostream& os, const SourcePosition& p) {
if (p.IsUnknown()) {
return os << "<?>";
} else if (FLAG_hydrogen_track_positions) {
return os << "<" << p.inlining_id() << ":" << p.position() << ">";
} else {
return os << "<0:" << p.raw() << ">";
}
}
#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(bool, is_eval)
PARSE_INFO_GETTER(bool, is_native)
PARSE_INFO_GETTER(bool, is_module)
PARSE_INFO_GETTER_WITH_DEFAULT(LanguageMode, language_mode, STRICT)
PARSE_INFO_GETTER_WITH_DEFAULT(Handle<JSFunction>, closure,
Handle<JSFunction>::null())
PARSE_INFO_GETTER(FunctionLiteral*, function)
PARSE_INFO_GETTER_WITH_DEFAULT(Scope*, scope, nullptr)
PARSE_INFO_GETTER(Handle<Context>, context)
PARSE_INFO_GETTER(Handle<SharedFunctionInfo>, shared_info)
#undef PARSE_INFO_GETTER
#undef PARSE_INFO_GETTER_WITH_DEFAULT
// Exactly like a CompilationInfo, except being allocated via {new} and it also
// creates and enters a Zone on construction and deallocates it on destruction.
class CompilationInfoWithZone : public CompilationInfo {
public:
explicit CompilationInfoWithZone(Handle<JSFunction> function)
: CompilationInfo(new ParseInfo(&zone_, function)) {}
// Virtual destructor because a CompilationInfoWithZone has to exit the
// zone scope and get rid of dependent maps even when the destructor is
// called when cast as a CompilationInfo.
virtual ~CompilationInfoWithZone() {
DisableFutureOptimization();
dependencies()->Rollback();
delete parse_info_;
parse_info_ = nullptr;
}
private:
Zone zone_;
};
bool CompilationInfo::has_shared_info() const {
return parse_info_ && !parse_info_->shared_info().is_null();
}
CompilationInfo::CompilationInfo(ParseInfo* parse_info)
: CompilationInfo(parse_info, nullptr, BASE, parse_info->isolate(),
parse_info->zone()) {
// 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 (isolate_->debug()->is_active()) MarkAsDebug();
if (FLAG_context_specialization) MarkAsContextSpecializing();
if (FLAG_turbo_inlining) MarkAsInliningEnabled();
if (FLAG_turbo_source_positions) MarkAsSourcePositionsEnabled();
if (FLAG_turbo_splitting) MarkAsSplittingEnabled();
if (FLAG_turbo_types) MarkAsTypingEnabled();
if (has_shared_info()) {
if (shared_info()->is_compiled()) {
// We should initialize the CompilationInfo feedback vector from the
// passed in shared info, rather than creating a new one.
feedback_vector_ = Handle<TypeFeedbackVector>(
shared_info()->feedback_vector(), parse_info->isolate());
}
if (shared_info()->never_compiled()) MarkAsFirstCompile();
}
}
CompilationInfo::CompilationInfo(CodeStub* stub, Isolate* isolate, Zone* zone)
: CompilationInfo(nullptr, stub, STUB, isolate, zone) {}
CompilationInfo::CompilationInfo(ParseInfo* parse_info, CodeStub* code_stub,
Mode mode, Isolate* isolate, Zone* zone)
: parse_info_(parse_info),
isolate_(isolate),
flags_(0),
code_stub_(code_stub),
mode_(mode),
osr_ast_id_(BailoutId::None()),
zone_(zone),
deferred_handles_(nullptr),
dependencies_(isolate, zone),
bailout_reason_(kNoReason),
prologue_offset_(Code::kPrologueOffsetNotSet),
no_frame_ranges_(isolate->cpu_profiler()->is_profiling()
? new List<OffsetRange>(2)
: nullptr),
track_positions_(FLAG_hydrogen_track_positions ||
isolate->cpu_profiler()->is_profiling()),
opt_count_(has_shared_info() ? shared_info()->opt_count() : 0),
parameter_count_(0),
optimization_id_(-1),
osr_expr_stack_height_(0),
function_type_(nullptr) {}
CompilationInfo::~CompilationInfo() {
DisableFutureOptimization();
delete deferred_handles_;
delete no_frame_ranges_;
#ifdef DEBUG
// Check that no dependent maps have been added or added dependent maps have
// been rolled back or committed.
DCHECK(dependencies()->IsEmpty());
#endif // DEBUG
}
int CompilationInfo::num_parameters() const {
return has_scope() ? 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(); }
int CompilationInfo::num_heap_slots() const {
return has_scope() ? scope()->num_heap_slots() : 0;
}
Code::Flags CompilationInfo::flags() const {
return code_stub() != nullptr
? Code::ComputeFlags(
code_stub()->GetCodeKind(), code_stub()->GetICState(),
code_stub()->GetExtraICState(), code_stub()->GetStubType())
: Code::ComputeFlags(Code::OPTIMIZED_FUNCTION);
}
// 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 && !function()->flags()->Contains(kDontSelfOptimize) &&
!function()->dont_optimize() &&
function()->scope()->AllowsLazyCompilation() &&
(!has_shared_info() || !shared_info()->optimization_disabled());
}
void CompilationInfo::EnsureFeedbackVector() {
if (feedback_vector_.is_null() ||
feedback_vector_->SpecDiffersFrom(function()->feedback_vector_spec())) {
feedback_vector_ = isolate()->factory()->NewTypeFeedbackVector(
function()->feedback_vector_spec());
}
}
bool CompilationInfo::is_simple_parameter_list() {
return scope()->is_simple_parameter_list();
}
bool CompilationInfo::MayUseThis() const {
return scope()->has_this_declaration() && scope()->receiver()->is_used();
}
int CompilationInfo::TraceInlinedFunction(Handle<SharedFunctionInfo> shared,
SourcePosition position,
int parent_id) {
DCHECK(track_positions_);
int inline_id = static_cast<int>(inlined_function_infos_.size());
InlinedFunctionInfo info(parent_id, position, UnboundScript::kNoScriptId,
shared->start_position());
if (!shared->script()->IsUndefined()) {
Handle<Script> script(Script::cast(shared->script()));
info.script_id = script->id()->value();
if (FLAG_hydrogen_track_positions && !script->source()->IsUndefined()) {
CodeTracer::Scope tracing_scope(isolate()->GetCodeTracer());
OFStream os(tracing_scope.file());
os << "--- FUNCTION SOURCE (" << shared->DebugName()->ToCString().get()
<< ") id{" << optimization_id() << "," << inline_id << "} ---\n";
{
DisallowHeapAllocation no_allocation;
int start = shared->start_position();
int len = shared->end_position() - start;
String::SubStringRange source(String::cast(script->source()), start,
len);
for (const auto& c : source) {
os << AsReversiblyEscapedUC16(c);
}
}
os << "\n--- END ---\n";
}
}
inlined_function_infos_.push_back(info);
if (FLAG_hydrogen_track_positions && inline_id != 0) {
CodeTracer::Scope tracing_scope(isolate()->GetCodeTracer());
OFStream os(tracing_scope.file());
os << "INLINE (" << shared->DebugName()->ToCString().get() << ") id{"
<< optimization_id() << "," << inline_id << "} AS " << inline_id
<< " AT " << position << std::endl;
}
return inline_id;
}
void CompilationInfo::LogDeoptCallPosition(int pc_offset, int inlining_id) {
if (!track_positions_ || IsStub()) return;
DCHECK_LT(static_cast<size_t>(inlining_id), inlined_function_infos_.size());
inlined_function_infos_.at(inlining_id).deopt_pc_offsets.push_back(pc_offset);
}
Handle<Code> CompilationInfo::GenerateCodeStub() {
// Run a "mini pipeline", extracted from compiler.cc.
CHECK(Parser::ParseStatic(parse_info()));
CHECK(Compiler::Analyze(parse_info()));
return compiler::Pipeline(this).GenerateCode();
}
class HOptimizedGraphBuilderWithPositions: public HOptimizedGraphBuilder {
public:
explicit HOptimizedGraphBuilderWithPositions(CompilationInfo* info)
: HOptimizedGraphBuilder(info) {
}
#define DEF_VISIT(type) \
void Visit##type(type* node) override { \
SourcePosition old_position = SourcePosition::Unknown(); \
if (node->position() != RelocInfo::kNoPosition) { \
old_position = source_position(); \
SetSourcePosition(node->position()); \
} \
HOptimizedGraphBuilder::Visit##type(node); \
if (!old_position.IsUnknown()) { \
set_source_position(old_position); \
} \
}
EXPRESSION_NODE_LIST(DEF_VISIT)
#undef DEF_VISIT
#define DEF_VISIT(type) \
void Visit##type(type* node) override { \
SourcePosition old_position = SourcePosition::Unknown(); \
if (node->position() != RelocInfo::kNoPosition) { \
old_position = source_position(); \
SetSourcePosition(node->position()); \
} \
HOptimizedGraphBuilder::Visit##type(node); \
if (!old_position.IsUnknown()) { \
set_source_position(old_position); \
} \
}
STATEMENT_NODE_LIST(DEF_VISIT)
#undef DEF_VISIT
#define DEF_VISIT(type) \
void Visit##type(type* node) override { \
HOptimizedGraphBuilder::Visit##type(node); \
}
DECLARATION_NODE_LIST(DEF_VISIT)
#undef DEF_VISIT
};
OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
DCHECK(info()->IsOptimizing());
DCHECK(!info()->IsCompilingForDebugging());
// Do not use Crankshaft/TurboFan if we need to be able to set break points.
if (isolate()->debug()->has_break_points()) {
return RetryOptimization(kDebuggerHasBreakPoints);
}
// 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()->opt_count() > kMaxOptCount) {
return AbortOptimization(kOptimizedTooManyTimes);
}
// Check the whitelist for Crankshaft.
if (!info()->closure()->PassesFilter(FLAG_hydrogen_filter)) {
return AbortOptimization(kHydrogenFilter);
}
// Optimization requires a version of fullcode with deoptimization support.
// Recompile the unoptimized version of the code if the current version
// doesn't have deoptimization support already.
// Otherwise, if we are gathering compilation time and space statistics
// for hydrogen, gather baseline statistics for a fullcode compilation.
bool should_recompile = !info()->shared_info()->has_deoptimization_support();
if (should_recompile || FLAG_hydrogen_stats) {
base::ElapsedTimer timer;
if (FLAG_hydrogen_stats) {
timer.Start();
}
if (!Compiler::EnsureDeoptimizationSupport(info())) {
return SetLastStatus(FAILED);
}
if (FLAG_hydrogen_stats) {
isolate()->GetHStatistics()->IncrementFullCodeGen(timer.Elapsed());
}
}
DCHECK(info()->shared_info()->has_deoptimization_support());
DCHECK(!info()->is_first_compile());
// Check the enabling conditions for TurboFan.
bool dont_crankshaft = info()->shared_info()->dont_crankshaft();
if (((FLAG_turbo_asm && info()->shared_info()->asm_function()) ||
(dont_crankshaft && strcmp(FLAG_turbo_filter, "~~") == 0) ||
info()->closure()->PassesFilter(FLAG_turbo_filter)) &&
(FLAG_turbo_osr || !info()->is_osr())) {
// Use TurboFan for the compilation.
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[compiling method " << Brief(*info()->closure())
<< " using TurboFan";
if (info()->is_osr()) os << " OSR";
os << "]" << std::endl;
}
if (info()->shared_info()->asm_function()) {
info()->MarkAsContextSpecializing();
} else if (FLAG_turbo_type_feedback) {
info()->MarkAsTypeFeedbackEnabled();
info()->EnsureFeedbackVector();
}
if (!info()->shared_info()->asm_function() ||
FLAG_turbo_asm_deoptimization) {
info()->MarkAsDeoptimizationEnabled();
}
Timer t(this, &time_taken_to_create_graph_);
compiler::Pipeline pipeline(info());
pipeline.GenerateCode();
if (!info()->code().is_null()) {
return SetLastStatus(SUCCEEDED);
}
}
if (!isolate()->use_crankshaft() || dont_crankshaft) {
// Crankshaft is entirely disabled.
return SetLastStatus(FAILED);
}
Scope* scope = info()->scope();
if (LUnallocated::TooManyParameters(scope->num_parameters())) {
// Crankshaft would require too many Lithium operands.
return AbortOptimization(kTooManyParameters);
}
if (info()->is_osr() &&
LUnallocated::TooManyParametersOrStackSlots(scope->num_parameters(),
scope->num_stack_slots())) {
// Crankshaft would require too many Lithium operands.
return AbortOptimization(kTooManyParametersLocals);
}
if (scope->HasIllegalRedeclaration()) {
// Crankshaft cannot handle illegal redeclarations.
return AbortOptimization(kFunctionWithIllegalRedeclaration);
}
if (FLAG_trace_opt) {
OFStream os(stdout);
os << "[compiling method " << Brief(*info()->closure())
<< " using Crankshaft";
if (info()->is_osr()) os << " OSR";
os << "]" << std::endl;
}
if (FLAG_trace_hydrogen) {
isolate()->GetHTracer()->TraceCompilation(info());
}
// Type-check the function.
AstTyper::Run(info());
// Optimization could have been disabled by the parser. Note that this check
// is only needed because the Hydrogen graph builder is missing some bailouts.
if (info()->shared_info()->optimization_disabled()) {
return AbortOptimization(
info()->shared_info()->disable_optimization_reason());
}
graph_builder_ = (info()->is_tracking_positions() || FLAG_trace_ic)
? new (info()->zone())
HOptimizedGraphBuilderWithPositions(info())
: new (info()->zone()) HOptimizedGraphBuilder(info());
Timer t(this, &time_taken_to_create_graph_);
graph_ = graph_builder_->CreateGraph();
if (isolate()->has_pending_exception()) {
return SetLastStatus(FAILED);
}
if (graph_ == NULL) return SetLastStatus(BAILED_OUT);
if (info()->dependencies()->HasAborted()) {
// Dependency has changed during graph creation. Let's try again later.
return RetryOptimization(kBailedOutDueToDependencyChange);
}
return SetLastStatus(SUCCEEDED);
}
OptimizedCompileJob::Status OptimizedCompileJob::OptimizeGraph() {
DisallowHeapAllocation no_allocation;
DisallowHandleAllocation no_handles;
DisallowHandleDereference no_deref;
DisallowCodeDependencyChange no_dependency_change;
DCHECK(last_status() == SUCCEEDED);
// TODO(turbofan): Currently everything is done in the first phase.
if (!info()->code().is_null()) {
return last_status();
}
Timer t(this, &time_taken_to_optimize_);
DCHECK(graph_ != NULL);
BailoutReason bailout_reason = kNoReason;
if (graph_->Optimize(&bailout_reason)) {
chunk_ = LChunk::NewChunk(graph_);
if (chunk_ != NULL) return SetLastStatus(SUCCEEDED);
} else if (bailout_reason != kNoReason) {
graph_builder_->Bailout(bailout_reason);
}
return SetLastStatus(BAILED_OUT);
}
OptimizedCompileJob::Status OptimizedCompileJob::GenerateCode() {
DCHECK(last_status() == SUCCEEDED);
// TODO(turbofan): Currently everything is done in the first phase.
if (!info()->code().is_null()) {
info()->dependencies()->Commit(info()->code());
if (info()->is_deoptimization_enabled()) {
info()->parse_info()->context()->native_context()->AddOptimizedCode(
*info()->code());
}
RecordOptimizationStats();
return last_status();
}
DCHECK(!info()->dependencies()->HasAborted());
DisallowCodeDependencyChange no_dependency_change;
DisallowJavascriptExecution no_js(isolate());
{ // Scope for timer.
Timer timer(this, &time_taken_to_codegen_);
DCHECK(chunk_ != NULL);
DCHECK(graph_ != NULL);
// Deferred handles reference objects that were accessible during
// graph creation. To make sure that we don't encounter inconsistencies
// between graph creation and code generation, we disallow accessing
// objects through deferred handles during the latter, with exceptions.
DisallowDeferredHandleDereference no_deferred_handle_deref;
Handle<Code> optimized_code = chunk_->Codegen();
if (optimized_code.is_null()) {
if (info()->bailout_reason() == kNoReason) {
return AbortOptimization(kCodeGenerationFailed);
}
return SetLastStatus(BAILED_OUT);
}
info()->SetCode(optimized_code);
}
RecordOptimizationStats();
// Add to the weak list of optimized code objects.
info()->context()->native_context()->AddOptimizedCode(*info()->code());
return SetLastStatus(SUCCEEDED);
}
void OptimizedCompileJob::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_);
}
}
// Sets the expected number of properties based on estimate from compiler.
void SetExpectedNofPropertiesFromEstimate(Handle<SharedFunctionInfo> shared,
int estimate) {
// If no properties are added in the constructor, they are more likely
// to be added later.
if (estimate == 0) estimate = 2;
// TODO(yangguo): check whether those heuristics are still up-to-date.
// We do not shrink objects that go into a snapshot (yet), so we adjust
// the estimate conservatively.
if (shared->GetIsolate()->serializer_enabled()) {
estimate += 2;
} else {
// Inobject slack tracking will reclaim redundant inobject space later,
// so we can afford to adjust the estimate generously.
estimate += 8;
}
shared->set_expected_nof_properties(estimate);
}
static void MaybeDisableOptimization(Handle<SharedFunctionInfo> shared_info,
BailoutReason bailout_reason) {
if (bailout_reason != kNoReason) {
shared_info->DisableOptimization(bailout_reason);
}
}
static void RecordFunctionCompilation(Logger::LogEventsAndTags tag,
CompilationInfo* info,
Handle<SharedFunctionInfo> shared) {
// SharedFunctionInfo is passed separately, because if CompilationInfo
// was created using Script object, it will not have it.
// 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()->cpu_profiler()->is_profiling()) {
Handle<Script> script = info->parse_info()->script();
Handle<Code> code = info->code();
if (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, *code, *shared, info, script_name,
line_num, column_num));
}
}
static bool CompileUnoptimizedCode(CompilationInfo* info) {
DCHECK(AllowCompilation::IsAllowed(info->isolate()));
if (!Compiler::Analyze(info->parse_info()) ||
!FullCodeGenerator::MakeCode(info)) {
Isolate* isolate = info->isolate();
if (!isolate->has_pending_exception()) isolate->StackOverflow();
return false;
}
return true;
}
MUST_USE_RESULT static MaybeHandle<Code> GetUnoptimizedCodeCommon(
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();
FunctionLiteral* lit = info->function();
shared->set_language_mode(lit->language_mode());
SetExpectedNofPropertiesFromEstimate(shared, lit->expected_property_count());
MaybeDisableOptimization(shared, lit->dont_optimize_reason());
// Compile unoptimized code.
if (!CompileUnoptimizedCode(info)) return MaybeHandle<Code>();
CHECK_EQ(Code::FUNCTION, info->code()->kind());
RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info, shared);
// Update the shared function info with the scope info. Allocating the
// ScopeInfo object may cause a GC.
Handle<ScopeInfo> scope_info =
ScopeInfo::Create(info->isolate(), info->zone(), info->scope());
shared->set_scope_info(*scope_info);
// Update the code and feedback vector for the shared function info.
shared->ReplaceCode(*info->code());
shared->set_feedback_vector(*info->feedback_vector());
return info->code();
}
MUST_USE_RESULT static 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>();
}
static void InsertCodeIntoOptimizedCodeMap(CompilationInfo* info) {
Handle<Code> code = info->code();
if (code->kind() != Code::OPTIMIZED_FUNCTION) return; // Nothing to do.
// Context specialization folds-in the context, so no sharing can occur.
if (code->is_turbofanned() && info->is_context_specializing()) return;
// Do not cache bound functions.
Handle<JSFunction> function = info->closure();
if (function->shared()->bound()) return;
// Cache optimized context-specific code.
if (FLAG_cache_optimized_code) {
Handle<SharedFunctionInfo> shared(function->shared());
Handle<FixedArray> 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 context-independent code compiled for OSR.
if (code->is_turbofanned() && info->is_osr()) return;
// Cache optimized context-independent code.
if (FLAG_turbo_cache_shared_code && code->is_turbofanned()) {
DCHECK(!info->is_context_specializing());
DCHECK(info->osr_ast_id().IsNone());
Handle<SharedFunctionInfo> shared(function->shared());
SharedFunctionInfo::AddSharedCodeToOptimizedCodeMap(shared, code);
}
}
static bool Renumber(ParseInfo* parse_info) {
if (!AstNumbering::Renumber(parse_info->isolate(), parse_info->zone(),
parse_info->function())) {
return false;
}
Handle<SharedFunctionInfo> shared_info = parse_info->shared_info();
if (!shared_info.is_null()) {
FunctionLiteral* lit = parse_info->function();
shared_info->set_ast_node_count(lit->ast_node_count());
MaybeDisableOptimization(shared_info, lit->dont_optimize_reason());
shared_info->set_dont_crankshaft(lit->flags()->Contains(kDontCrankshaft));
}
return true;
}
bool Compiler::Analyze(ParseInfo* info) {
DCHECK(info->function() != NULL);
if (!Rewriter::Rewrite(info)) return false;
if (!Scope::Analyze(info)) return false;
if (!Renumber(info)) return false;
DCHECK(info->scope() != NULL);
return true;
}
bool Compiler::ParseAndAnalyze(ParseInfo* info) {
if (!Parser::ParseStatic(info)) return false;
return Compiler::Analyze(info);
}
static bool GetOptimizedCodeNow(CompilationInfo* info) {
if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
OptimizedCompileJob job(info);
if (job.CreateGraph() != OptimizedCompileJob::SUCCEEDED ||
job.OptimizeGraph() != OptimizedCompileJob::SUCCEEDED ||
job.GenerateCode() != OptimizedCompileJob::SUCCEEDED) {
if (FLAG_trace_opt) {
PrintF("[aborted optimizing ");
info->closure()->ShortPrint();
PrintF(" because: %s]\n", GetBailoutReason(info->bailout_reason()));
}
return false;
}
// Success!
DCHECK(!info->isolate()->has_pending_exception());
InsertCodeIntoOptimizedCodeMap(info);
RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info,
info->shared_info());
return true;
}
static bool GetOptimizedCodeLater(CompilationInfo* 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;
}
CompilationHandleScope handle_scope(info);
if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
// Reopen handles in the new CompilationHandleScope.
info->ReopenHandlesInNewHandleScope();
info->parse_info()->ReopenHandlesInNewHandleScope();
TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
OptimizedCompileJob* job = new (info->zone()) OptimizedCompileJob(info);
OptimizedCompileJob::Status status = job->CreateGraph();
if (status != OptimizedCompileJob::SUCCEEDED) return false;
isolate->optimizing_compile_dispatcher()->QueueForOptimization(job);
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Queued ");
info->closure()->ShortPrint();
if (info->is_osr()) {
PrintF(" for concurrent OSR at %d.\n", info->osr_ast_id().ToInt());
} else {
PrintF(" for concurrent optimization.\n");
}
}
return true;
}
MaybeHandle<Code> Compiler::GetUnoptimizedCode(Handle<JSFunction> function) {
DCHECK(!function->GetIsolate()->has_pending_exception());
DCHECK(!function->is_compiled());
if (function->shared()->is_compiled()) {
return Handle<Code>(function->shared()->code());
}
CompilationInfoWithZone info(function);
Handle<Code> result;
ASSIGN_RETURN_ON_EXCEPTION(info.isolate(), result,
GetUnoptimizedCodeCommon(&info),
Code);
return result;
}
MaybeHandle<Code> Compiler::GetLazyCode(Handle<JSFunction> function) {
Isolate* isolate = function->GetIsolate();
DCHECK(!isolate->has_pending_exception());
DCHECK(!function->is_compiled());
AggregatedHistogramTimerScope timer(isolate->counters()->compile_lazy());
// If the debugger is active, do not compile with turbofan unless we can
// deopt from turbofan code.
if (FLAG_turbo_asm && function->shared()->asm_function() &&
(FLAG_turbo_asm_deoptimization || !isolate->debug()->is_active()) &&
!FLAG_turbo_osr) {
CompilationInfoWithZone info(function);
VMState<COMPILER> state(isolate);
PostponeInterruptsScope postpone(isolate);
info.SetOptimizing(BailoutId::None(), handle(function->shared()->code()));
if (GetOptimizedCodeNow(&info)) {
DCHECK(function->shared()->is_compiled());
return info.code();
}
// We have failed compilation. If there was an exception clear it so that
// we can compile unoptimized code.
if (isolate->has_pending_exception()) isolate->clear_pending_exception();
}
if (function->shared()->is_compiled()) {
return Handle<Code>(function->shared()->code());
}
CompilationInfoWithZone info(function);
Handle<Code> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result, GetUnoptimizedCodeCommon(&info),
Code);
if (FLAG_always_opt) {
Handle<Code> opt_code;
if (Compiler::GetOptimizedCode(
function, result,
Compiler::NOT_CONCURRENT).ToHandle(&opt_code)) {
result = opt_code;
}
}
return result;
}
MaybeHandle<Code> Compiler::GetUnoptimizedCode(
Handle<SharedFunctionInfo> shared) {
DCHECK(!shared->GetIsolate()->has_pending_exception());
DCHECK(!shared->is_compiled());
Zone zone;
ParseInfo parse_info(&zone, shared);
CompilationInfo info(&parse_info);
return GetUnoptimizedCodeCommon(&info);
}
bool Compiler::EnsureCompiled(Handle<JSFunction> function,
ClearExceptionFlag flag) {
if (function->is_compiled()) return true;
MaybeHandle<Code> maybe_code = Compiler::GetLazyCode(function);
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
if (flag == CLEAR_EXCEPTION) {
function->GetIsolate()->clear_pending_exception();
}
return false;
}
function->ReplaceCode(*code);
DCHECK(function->is_compiled());
return true;
}
// TODO(turbofan): In the future, unoptimized code with deopt support could
// be generated lazily once deopt is triggered.
bool Compiler::EnsureDeoptimizationSupport(CompilationInfo* info) {
DCHECK(info->function() != NULL);
DCHECK(info->scope() != NULL);
Handle<SharedFunctionInfo> shared = info->shared_info();
if (!shared->has_deoptimization_support()) {
// TODO(titzer): just reuse the ParseInfo for the unoptimized compile.
CompilationInfoWithZone unoptimized(info->closure());
// Note that we use the same AST that we will use for generating the
// optimized code.
ParseInfo* parse_info = unoptimized.parse_info();
parse_info->set_literal(info->function());
parse_info->set_scope(info->scope());
parse_info->set_context(info->context());
unoptimized.EnableDeoptimizationSupport();
// If the current code has reloc info for serialization, also include
// reloc info for serialization for the new code, so that deopt support
// can be added without losing IC state.
if (shared->code()->kind() == Code::FUNCTION &&
shared->code()->has_reloc_info_for_serialization()) {
unoptimized.PrepareForSerializing();
}
if (!FullCodeGenerator::MakeCode(&unoptimized)) return false;
shared->EnableDeoptimizationSupport(*unoptimized.code());
shared->set_feedback_vector(*unoptimized.feedback_vector());
info->MarkAsCompiled();
// The scope info might not have been set if a lazily compiled
// function is inlined before being called for the first time.
if (shared->scope_info() == ScopeInfo::Empty(info->isolate())) {
Handle<ScopeInfo> target_scope_info =
ScopeInfo::Create(info->isolate(), info->zone(), info->scope());
shared->set_scope_info(*target_scope_info);
}
// The existing unoptimized code was replaced with the new one.
RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, &unoptimized, shared);
}
return true;
}
// Compile full code for debugging. This code will have debug break slots
// and deoptimization information. Deoptimization information is required
// in case that an optimized version of this function is still activated on
// the stack. It will also make sure that the full code is compiled with
// the same flags as the previous version, that is flags which can change
// the code generated. The current method of mapping from already compiled
// full code without debug break slots to full code with debug break slots
// depends on the generated code is otherwise exactly the same.
// If compilation fails, just keep the existing code.
MaybeHandle<Code> Compiler::GetDebugCode(Handle<JSFunction> function) {
CompilationInfoWithZone info(function);
Isolate* isolate = info.isolate();
VMState<COMPILER> state(isolate);
info.MarkAsDebug();
DCHECK(!isolate->has_pending_exception());
Handle<Code> old_code(function->shared()->code());
DCHECK(old_code->kind() == Code::FUNCTION);
DCHECK(!old_code->has_debug_break_slots());
info.MarkCompilingForDebugging();
if (old_code->is_compiled_optimizable()) {
info.EnableDeoptimizationSupport();