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56eca6d315
v8/src/compiler.cc
mstarzinger 56eca6d315 [crankshaft] Remove graph builder from optimized compile job. 
There is no reason to keep around the HOptimizedGraphBuilder after the
graph has successfully been built. Later phases in OptimizedCompileJob
should not rely on it anymore.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1756183002

Cr-Commit-Position: refs/heads/master@{#34440}
2016-03-02 17:27:38 +00:00

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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/crankshaft/lithium.h"
#include "src/crankshaft/typing.h"
#include "src/debug/debug.h"
#include "src/debug/liveedit.h"
#include "src/deoptimizer.h"
#include "src/full-codegen/full-codegen.h"
#include "src/gdb-jit.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/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(bool, is_eval)
PARSE_INFO_GETTER(bool, is_native)
PARSE_INFO_GETTER(bool, is_module)
PARSE_INFO_GETTER(FunctionLiteral*, literal)
PARSE_INFO_GETTER_WITH_DEFAULT(LanguageMode, language_mode, STRICT)
PARSE_INFO_GETTER_WITH_DEFAULT(Handle<JSFunction>, closure,
Handle<JSFunction>::null())
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();
}
bool CompilationInfo::has_context() const {
return parse_info_ && !parse_info_->context().is_null();
}
bool CompilationInfo::has_literal() const {
return parse_info_ && parse_info_->literal() != nullptr;
}
bool CompilationInfo::has_scope() const {
return parse_info_ && parse_info_->scope() != nullptr;
}
CompilationInfo::CompilationInfo(ParseInfo* parse_info)
: CompilationInfo(parse_info, nullptr, Code::ComputeFlags(Code::FUNCTION),
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 (FLAG_function_context_specialization) MarkAsFunctionContextSpecializing();
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(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, 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->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),
debug_name_(debug_name) {}
CompilationInfo::~CompilationInfo() {
DisableFutureOptimization();
delete deferred_handles_;
#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;
}
// 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() &&
(!has_shared_info() || !shared_info()->optimization_disabled());
}
void CompilationInfo::EnsureFeedbackVector() {
if (feedback_vector_.is_null()) {
Handle<TypeFeedbackMetadata> feedback_metadata =
TypeFeedbackMetadata::New(isolate(), literal()->feedback_vector_spec());
feedback_vector_ = TypeFeedbackVector::New(isolate(), feedback_metadata);
}
// It's very important that recompiles do not alter the structure of the
// type feedback vector.
CHECK(!feedback_vector_->metadata()->SpecDiffersFrom(
literal()->feedback_vector_spec()));
}
bool CompilationInfo::has_simple_parameters() {
return scope()->has_simple_parameters();
}
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();
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);
}
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();
}
const char* str = debug_name_ ? debug_name_ : "unknown";
size_t len = strlen(str) + 1;
base::SmartArrayPointer<char> name(new char[len]);
memcpy(name.get(), str, len);
return name;
}
bool CompilationInfo::ExpectsJSReceiverAsReceiver() {
return is_sloppy(language_mode()) && !is_native();
}
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());
// Do not use Crankshaft/TurboFan if we need to be able to set break points.
if (info()->shared_info()->HasDebugInfo()) {
return AbortOptimization(kFunctionBeingDebugged);
}
// 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());
bool optimization_disabled = info()->shared_info()->optimization_disabled();
bool dont_crankshaft = info()->shared_info()->dont_crankshaft();
// Check the enabling conditions for Turbofan.
// 1. "use asm" code.
bool is_turbofanable_asm = FLAG_turbo_asm &&
info()->shared_info()->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 = info()->closure()->PassesFilter(FLAG_turbo_filter);
// If this is OSR request, OSR must be enabled by Turbofan.
bool passes_osr_test = FLAG_turbo_osr || !info()->is_osr();
if ((is_turbofanable_asm || is_unsupported_by_crankshaft_but_turbofanable ||
passes_turbo_filter) &&
passes_osr_test) {
// 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()) {
if (info()->osr_frame()) info()->MarkAsFrameSpecializing();
info()->MarkAsFunctionContextSpecializing();
} else {
if (!FLAG_always_opt) {
info()->MarkAsBailoutOnUninitialized();
}
if (FLAG_native_context_specialization) {
info()->MarkAsNativeContextSpecializing();
info()->MarkAsTypingEnabled();
}
}
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(info()->isolate(), info()->zone(), info()->closure(),
info()->scope(), info()->osr_ast_id(), info()->literal())
.Run();
// 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());
}
HOptimizedGraphBuilder* 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) {
info_->AbortOptimization(bailout_reason);
}
return SetLastStatus(BAILED_OUT);
}
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);
}
void 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);
}
} // namespace
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());
RegisterWeakObjectsInOptimizedCode(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);
}
RegisterWeakObjectsInOptimizedCode(optimized_code);
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<AbstractCode> abstract_code = info->abstract_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, 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;
}
static bool UseIgnition(CompilationInfo* info) {
// Cannot use Ignition when the {function_data} is already used.
if (info->has_shared_info() && info->shared_info()->HasBuiltinFunctionId()) {
return false;
}
// Checks whether top level functions should be passed by the filter.
if (info->closure().is_null()) {
Vector<const char> filter = CStrVector(FLAG_ignition_filter);
return (filter.length() == 0) || (filter.length() == 1 && filter[0] == '*');
}
// Finally respect the filter.
return info->closure()->PassesFilter(FLAG_ignition_filter);
}
static int CodeAndMetadataSize(CompilationInfo* info) {
int size = 0;
if (info->has_bytecode_array()) {
Handle<BytecodeArray> bytecode_array = info->bytecode_array();
size += bytecode_array->BytecodeArraySize();
size += bytecode_array->constant_pool()->Size();
size += bytecode_array->handler_table()->Size();
size += bytecode_array->source_position_table()->Size();
} else {
Handle<Code> code = info->code();
size += code->CodeSize();
size += code->relocation_info()->Size();
size += code->deoptimization_data()->Size();
size += code->handler_table()->Size();
}
return size;
}
static bool GenerateBaselineCode(CompilationInfo* info) {
bool success;
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();
counters->total_baseline_code_size()->Increment(CodeAndMetadataSize(info));
counters->total_baseline_compile_count()->Increment(1);
}
return success;
}
static bool CompileBaselineCode(CompilationInfo* info) {
DCHECK(AllowCompilation::IsAllowed(info->isolate()));
if (!Compiler::Analyze(info->parse_info()) || !GenerateBaselineCode(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->literal();
DCHECK_EQ(shared->language_mode(), lit->language_mode());
SetExpectedNofPropertiesFromEstimate(shared, lit->expected_property_count());
MaybeDisableOptimization(shared, lit->dont_optimize_reason());
// Compile either unoptimized code or bytecode for the interpreter.
if (!CompileBaselineCode(info)) return MaybeHandle<Code>();
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());
if (info->has_bytecode_array()) {
DCHECK(!shared->HasBytecodeArray()); // Only compiled once.
shared->set_bytecode_array(*info->bytecode_array());
}
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.
// 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);
}
}
static 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());
MaybeDisableOptimization(shared_info, lit->dont_optimize_reason());
shared_info->set_dont_crankshaft(
shared_info->dont_crankshaft() ||
(lit->flags() & AstProperties::kDontCrankshaft));
}
return true;
}
bool Compiler::Analyze(ParseInfo* info) {
DCHECK_NOT_NULL(info->literal());
if (!Rewriter::Rewrite(info)) return false;
if (!Scope::Analyze(info)) return false;
if (!Renumber(info)) return false;
DCHECK_NOT_NULL(info->scope());
return true;
}
bool Compiler::ParseAndAnalyze(ParseInfo* info) {
if (!Parser::ParseStatic(info)) return false;
return Compiler::Analyze(info);
}
static bool GetOptimizedCodeNow(CompilationInfo* info) {
Isolate* isolate = info->isolate();
CanonicalHandleScope canonical(isolate);
TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate);
TRACE_EVENT0("v8", "V8.OptimizeCode");
if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
TimerEventScope<TimerEventRecompileSynchronous> timer(isolate);
TRACE_EVENT0("v8", "V8.RecompileSynchronous");
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(!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();
CanonicalHandleScope canonical(isolate);
TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate);
TRACE_EVENT0("v8", "V8.OptimizeCode");
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());
TRACE_EVENT0("v8", "V8.RecompileSynchronous");
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());
TimerEventScope<TimerEventCompileCode> compile_timer(isolate);
TRACE_EVENT0("v8", "V8.CompileCode");
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();
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, Compiler::NOT_CONCURRENT)
.ToHandle(&opt_code)) {
result = opt_code;
}
}
return result;
}
bool Compiler::Compile(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_NOT_NULL(info->literal());
DCHECK(info->has_scope());
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->literal());
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;
}
bool CompileEvalForDebugging(Handle<JSFunction> function,
Handle<SharedFunctionInfo> shared) {
Handle<Script> script(Script::cast(shared->script()));
Handle<Context> context(function->context());
Zone zone;
ParseInfo parse_info(&zone, script);
CompilationInfo info(&parse_info);
Isolate* isolate = info.isolate();
parse_info.set_eval();
parse_info.set_context(context);
if (context->IsNativeContext()) parse_info.set_global();
parse_info.set_toplevel();
parse_info.set_allow_lazy_parsing(false);
parse_info.set_language_mode(shared->language_mode());
parse_info.set_parse_restriction(NO_PARSE_RESTRICTION);
info.MarkAsDebug();
VMState<COMPILER> state(info.isolate());
if (!Parser::ParseStatic(&parse_info)) {
isolate->clear_pending_exception();
return false;
}
FunctionLiteral* lit = parse_info.literal();
LiveEditFunctionTracker live_edit_tracker(isolate, lit);
if (!CompileUnoptimizedCode(&info)) {
isolate->clear_pending_exception();
return false;
}
shared->ReplaceCode(*info.code());
return true;
}
bool CompileForDebugging(CompilationInfo* info) {
info->MarkAsDebug();
if (GetUnoptimizedCodeCommon(info).is_null()) {
info->isolate()->clear_pending_exception();
return false;
}
return true;
}
static inline bool IsEvalToplevel(Handle<SharedFunctionInfo> shared) {
return shared->is_toplevel() && shared->script()->IsScript() &&
Script::cast(shared->script())->compilation_type() ==
Script::COMPILATION_TYPE_EVAL;
}
bool Compiler::CompileDebugCode(Handle<JSFunction> function) {
Handle<SharedFunctionInfo> shared(function->shared());
if (IsEvalToplevel(shared)) {
return CompileEvalForDebugging(function, shared);
} else {
CompilationInfoWithZone info(function);
return CompileForDebugging(&info);
}
}
bool Compiler::CompileDebugCode(Handle<SharedFunctionInfo> shared) {
DCHECK(shared->allows_lazy_compilation_without_context());
DCHECK(!IsEvalToplevel(shared));
Zone zone;
ParseInfo parse_info(&zone, shared);
CompilationInfo info(&parse_info);
return CompileForDebugging(&info);
}
void Compiler::CompileForLiveEdit(Handle<Script> script) {
// TODO(635): support extensions.
Zone zone;
ParseInfo parse_info(&zone, script);
CompilationInfo info(&parse_info);
PostponeInterruptsScope postpone(info.isolate());
VMState<COMPILER> state(info.isolate());
// Get rid of old list of shared function infos.
info.MarkAsFirstCompile();
info.MarkAsDebug();
info.parse_info()->set_global();
if (!Parser::ParseStatic(info.parse_info())) return;
LiveEditFunctionTracker tracker(info.isolate(), parse_info.literal());
if (!CompileUnoptimizedCode(&info)) return;
if (info.has_shared_info()) {
Handle<ScopeInfo> scope_info =
ScopeInfo::Create(info.isolate(), info.zone(), info.scope());
info.shared_info()->set_scope_info(*scope_info);
}
tracker.RecordRootFunctionInfo(info.code());
}
static Handle<SharedFunctionInfo> CompileToplevel(CompilationInfo* info) {
Isolate* isolate = info->isolate();
TimerEventScope<TimerEventCompileCode> timer(isolate);
TRACE_EVENT0("v8", "V8.CompileCode");
PostponeInterruptsScope postpone(isolate);
DCHECK(!isolate->native_context().is_null());
ParseInfo* parse_info = info->parse_info();
Handle<Script> script = parse_info->script();
// TODO(svenpanne) Obscure place for this, perhaps move to OnBeforeCompile?
FixedArray* array = isolate->native_context()->embedder_data();
script->set_context_data(array->get(v8::Context::kDebugIdIndex));
isolate->debug()->OnBeforeCompile(script);
DCHECK(parse_info->is_eval() || parse_info->is_global() ||
parse_info->is_module());
parse_info->set_toplevel();
Handle<SharedFunctionInfo> result;
{ VMState<COMPILER> state(info->isolate());
if (parse_info->literal() == NULL) {
// Parse the script if needed (if it's already parsed, literal() is
// non-NULL). If compiling for debugging, we may eagerly compile inner
// functions, so do not parse lazily in that case.
ScriptCompiler::CompileOptions options = parse_info->compile_options();
bool parse_allow_lazy = (options == ScriptCompiler::kConsumeParserCache ||
String::cast(script->source())->length() >
FLAG_min_preparse_length) &&
!info->is_debug();
parse_info->set_allow_lazy_parsing(parse_allow_lazy);
if (!parse_allow_lazy &&
(options == ScriptCompiler::kProduceParserCache ||
options == ScriptCompiler::kConsumeParserCache)) {
// We are going to parse eagerly, but we either 1) have cached data
// produced by lazy parsing or 2) are asked to generate cached data.
// Eager parsing cannot benefit from cached data, and producing cached
// data while parsing eagerly is not implemented.
parse_info->set_cached_data(nullptr);
parse_info->set_compile_options(ScriptCompiler::kNoCompileOptions);
}
if (!Parser::ParseStatic(parse_info)) {
return Handle<SharedFunctionInfo>::null();
}
}
DCHECK(!info->is_debug() || !parse_info->allow_lazy_parsing());
info->MarkAsFirstCompile();
FunctionLiteral* lit = parse_info->literal();
LiveEditFunctionTracker live_edit_tracker(isolate, lit);
// 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 = info->is_eval()
? info->isolate()->counters()->compile_eval()
: info->isolate()->counters()->compile();
HistogramTimerScope timer(rate);
TRACE_EVENT0("v8", info->is_eval() ? "V8.CompileEval" : "V8.Compile");
// Compile the code.
if (!CompileBaselineCode(info)) {
return Handle<SharedFunctionInfo>::null();
}
// Allocate function.
DCHECK(!info->code().is_null());
result = isolate->factory()->NewSharedFunctionInfo(
lit->name(), lit->materialized_literal_count(), lit->kind(),
info->code(),
ScopeInfo::Create(info->isolate(), info->zone(), info->scope()),
info->feedback_vector());
if (info->has_bytecode_array()) {
DCHECK(!result->HasBytecodeArray()); // Only compiled once.
result->set_bytecode_array(*info->bytecode_array());
}
DCHECK_EQ(RelocInfo::kNoPosition, lit->function_token_position());
SharedFunctionInfo::InitFromFunctionLiteral(result, lit);
SharedFunctionInfo::SetScript(result, script);
result->set_is_toplevel(true);
if (info->is_eval()) {
// Eval scripts cannot be (re-)compiled without context.
result->set_allows_lazy_compilation_without_context(false);
}
Handle<String> script_name =
script->name()->IsString()
? Handle<String>(String::cast(script->name()))
: isolate->factory()->empty_string();
Logger::LogEventsAndTags log_tag = info->is_eval()
? Logger::EVAL_TAG
: Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script);
PROFILE(isolate, CodeCreateEvent(log_tag, *info->abstract_code(), *result,
info, *script_name));
// Hint to the runtime system used when allocating space for initial
// property space by setting the expected number of properties for
// the instances of the function.
SetExpectedNofPropertiesFromEstimate(result,
lit->expected_property_count());
if (!script.is_null())
script->set_compilation_state(Script::COMPILATION_STATE_COMPILED);
live_edit_tracker.RecordFunctionInfo(result, lit, info->zone());
}
return result;
}
MaybeHandle<JSFunction> Compiler::GetFunctionFromEval(
Handle<String> source, Handle<SharedFunctionInfo> outer_info,
Handle<Context> context, LanguageMode language_mode,
ParseRestriction restriction, 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);
CompilationCache* compilation_cache = isolate->compilation_cache();
MaybeHandle<SharedFunctionInfo> maybe_shared_info =
compilation_cache->LookupEval(source, outer_info, context, language_mode,
line_offset);
Handle<SharedFunctionInfo> shared_info;
Handle<Script> script;
if (!maybe_shared_info.ToHandle(&shared_info)) {
script = isolate->factory()->NewScript(source);
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);
Zone zone;
ParseInfo parse_info(&zone, script);
CompilationInfo info(&parse_info);
parse_info.set_eval();
if (context->IsNativeContext()) parse_info.set_global();
parse_info.set_language_mode(language_mode);
parse_info.set_parse_restriction(restriction);
parse_info.set_context(context);
Debug::RecordEvalCaller(script);
shared_info = CompileToplevel(&info);
if (shared_info.is_null()) {
return MaybeHandle<JSFunction>();
} else {
// Explicitly disable optimization for eval code. We're not yet prepared
// to handle eval-code in the optimizing compiler.
if (restriction != ONLY_SINGLE_FUNCTION_LITERAL) {
shared_info->DisableOptimization(kEval);
}
// 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()));
compilation_cache->PutEval(source, outer_info, context, shared_info,
line_offset);
}
} else if (shared_info->ic_age() != isolate->heap()->global_ic_age()) {
shared_info->ResetForNewContext(isolate->heap()->global_ic_age());
}
Handle<JSFunction> result =
isolate->factory()->NewFunctionFromSharedFunctionInfo(
shared_info, context, NOT_TENURED);
// 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;
}
Handle<SharedFunctionInfo> Compiler::CompileScript(
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,
bool is_module) {
Isolate* isolate = source->GetIsolate();
if (compile_options == ScriptCompiler::kNoCompileOptions) {
cached_data = NULL;
} else if (compile_options == ScriptCompiler::kProduceParserCache ||
compile_options == ScriptCompiler::kProduceCodeCache) {
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);
// TODO(rossberg): The natives do not yet obey strong mode rules
// (for example, some macros use '==').
bool use_strong = FLAG_use_strong && !isolate->bootstrapper()->IsActive();
LanguageMode language_mode =
construct_language_mode(FLAG_use_strict, use_strong);
CompilationCache* compilation_cache = isolate->compilation_cache();
// Do a lookup in the compilation cache but not for extensions.
MaybeHandle<SharedFunctionInfo> maybe_result;
Handle<SharedFunctionInfo> result;
if (extension == NULL) {
// First check per-isolate compilation cache.
maybe_result = compilation_cache->LookupScript(
source, script_name, line_offset, column_offset, resource_options,
context, language_mode);
if (maybe_result.is_null() && FLAG_serialize_toplevel &&
compile_options == ScriptCompiler::kConsumeCodeCache &&
!isolate->debug()->is_loaded()) {
// Then check cached code provided by embedder.
HistogramTimerScope timer(isolate->counters()->compile_deserialize());
TRACE_EVENT0("v8", "V8.CompileDeserialize");
Handle<SharedFunctionInfo> result;
if (CodeSerializer::Deserialize(isolate, *cached_data, source)
.ToHandle(&result)) {
// Promote to per-isolate compilation cache.
compilation_cache->PutScript(source, context, language_mode, result);
return result;
}
// Deserializer failed. Fall through to compile.
}
}
base::ElapsedTimer timer;
if (FLAG_profile_deserialization && FLAG_serialize_toplevel &&
compile_options == ScriptCompiler::kProduceCodeCache) {
timer.Start();
}
if (!maybe_result.ToHandle(&result)) {
// No cache entry found. Compile the script.
// Create a script object describing the script to be compiled.
Handle<Script> script = isolate->factory()->NewScript(source);
if (natives == NATIVES_CODE) {
script->set_type(Script::TYPE_NATIVE);
script->set_hide_source(true);
} else if (natives == EXTENSION_CODE) {
script->set_type(Script::TYPE_EXTENSION);
script->set_hide_source(true);
}
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);
}
// Compile the function and add it to the cache.
Zone zone;
ParseInfo parse_info(&zone, script);
CompilationInfo info(&parse_info);
if (FLAG_harmony_modules && is_module) {
parse_info.set_module();
} else {
parse_info.set_global();
}
if (compile_options != ScriptCompiler::kNoCompileOptions) {
parse_info.set_cached_data(cached_data);
}
parse_info.set_compile_options(compile_options);
parse_info.set_extension(extension);
parse_info.set_context(context);
if (FLAG_serialize_toplevel &&
compile_options == ScriptCompiler::kProduceCodeCache) {
info.PrepareForSerializing();
}
parse_info.set_language_mode(
static_cast<LanguageMode>(info.language_mode() | language_mode));
result = CompileToplevel(&info);
if (extension == NULL && !result.is_null()) {
compilation_cache->PutScript(source, context, language_mode, result);
if (FLAG_serialize_toplevel &&
compile_options == ScriptCompiler::kProduceCodeCache) {
HistogramTimerScope histogram_timer(
isolate->counters()->compile_serialize());
TRACE_EVENT0("v8", "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()) {
isolate->ReportPendingMessages();
} else {
isolate->debug()->OnAfterCompile(script);
}
} else if (result->ic_age() != isolate->heap()->global_ic_age()) {
result->ResetForNewContext(isolate->heap()->global_ic_age());
}
return result;
}
Handle<SharedFunctionInfo> Compiler::CompileStreamedScript(
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, FLAG_use_strong);
parse_info->set_language_mode(
static_cast<LanguageMode>(parse_info->language_mode() | language_mode));
CompilationInfo compile_info(parse_info);
// The source was parsed lazily, so compiling for debugging is not possible.
DCHECK(!compile_info.is_debug());
Handle<SharedFunctionInfo> result = CompileToplevel(&compile_info);
if (!result.is_null()) isolate->debug()->OnAfterCompile(script);
return result;
}
Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfo(
FunctionLiteral* literal, Handle<Script> script,
CompilationInfo* outer_info) {
// Precondition: code has been parsed and scopes have been analyzed.
Isolate* isolate = outer_info->isolate();
MaybeHandle<SharedFunctionInfo> maybe_existing;
if (outer_info->is_first_compile()) {
// On the first compile, there are no existing shared function info for
// inner functions yet, so do not try to find them. All bets are off for
// live edit though.
DCHECK(script->FindSharedFunctionInfo(literal).is_null() ||
isolate->debug()->live_edit_enabled());
} else {
maybe_existing = script->FindSharedFunctionInfo(literal);
}
// We found an existing shared function info. If it's already compiled,
// don't worry about compiling it, and simply return it. If it's not yet
// compiled, continue to decide whether to eagerly compile.
// Carry on if we are compiling eager to obtain code for debugging,
// unless we already have code with debut break slots.
Handle<SharedFunctionInfo> existing;
if (maybe_existing.ToHandle(&existing) && existing->is_compiled()) {
if (!outer_info->is_debug() || existing->HasDebugCode()) {
return existing;
}
}
Zone zone;
ParseInfo parse_info(&zone, script);
CompilationInfo info(&parse_info);
parse_info.set_literal(literal);
parse_info.set_scope(literal->scope());
parse_info.set_language_mode(literal->scope()->language_mode());
if (outer_info->will_serialize()) info.PrepareForSerializing();
if (outer_info->is_first_compile()) info.MarkAsFirstCompile();
if (outer_info->is_debug()) info.MarkAsDebug();
LiveEditFunctionTracker live_edit_tracker(isolate, literal);
// Determine if the function can be lazily compiled. This is necessary to
// allow some of our builtin JS files to be lazily compiled. These
// builtins cannot be handled lazily by the parser, since we have to know
// if a function uses the special natives syntax, which is something the
// parser records.
// If the debugger requests compilation for break points, we cannot be
// aggressive about lazy compilation, because it might trigger compilation
// of functions without an outer context when setting a breakpoint through
// Debug::FindSharedFunctionInfoInScript.
bool allow_lazy_without_ctx = literal->AllowsLazyCompilationWithoutContext();
// Compile eagerly for live edit. When compiling debug code, eagerly compile
// unless we can lazily compile without the context.
bool allow_lazy = literal->AllowsLazyCompilation() &&
!LiveEditFunctionTracker::IsActive(isolate) &&
(!info.is_debug() || allow_lazy_without_ctx);
bool lazy = FLAG_lazy && allow_lazy && !literal->should_eager_compile();
// Generate code
TimerEventScope<TimerEventCompileCode> timer(isolate);
TRACE_EVENT0("v8", "V8.CompileCode");
Handle<ScopeInfo> scope_info;
if (lazy) {
Handle<Code> code = isolate->builtins()->CompileLazy();
info.SetCode(code);
// There's no need in theory for a lazy-compiled function to have a type
// feedback vector, but some parts of the system expect all
// SharedFunctionInfo instances to have one. The size of the vector depends
// on how many feedback-needing nodes are in the tree, and when lazily
// parsing we might not know that, if this function was never parsed before.
// In that case the vector will be replaced the next time MakeCode is
// called.
info.EnsureFeedbackVector();
scope_info = Handle<ScopeInfo>(ScopeInfo::Empty(isolate));
} else if (Renumber(info.parse_info()) && GenerateBaselineCode(&info)) {
// Code generation will ensure that the feedback vector is present and
// appropriately sized.
DCHECK(!info.code().is_null());
scope_info = ScopeInfo::Create(info.isolate(), info.zone(), info.scope());
if (literal->should_eager_compile() &&
literal->should_be_used_once_hint()) {
info.code()->MarkToBeExecutedOnce(isolate);
}
} else {
return Handle<SharedFunctionInfo>::null();
}
if (maybe_existing.is_null()) {
// Create a shared function info object.
Handle<SharedFunctionInfo> result =
isolate->factory()->NewSharedFunctionInfo(
literal->name(), literal->materialized_literal_count(),
literal->kind(), info.code(), scope_info, info.feedback_vector());
if (info.has_bytecode_array()) {
DCHECK(!result->HasBytecodeArray()); // Only compiled once.
result->set_bytecode_array(*info.bytecode_array());
}
SharedFunctionInfo::InitFromFunctionLiteral(result, literal);
SharedFunctionInfo::SetScript(result, script);
result->set_is_toplevel(false);
// If the outer function has been compiled before, we cannot be sure that
// shared function info for this function literal has been created for the
// first time. It may have already been compiled previously.
result->set_never_compiled(outer_info->is_first_compile() && lazy);
RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, result);
result->set_allows_lazy_compilation(literal->AllowsLazyCompilation());
result->set_allows_lazy_compilation_without_context(allow_lazy_without_ctx);
// Set the expected number of properties for instances and return
// the resulting function.
SetExpectedNofPropertiesFromEstimate(result,
literal->expected_property_count());
live_edit_tracker.RecordFunctionInfo(result, literal, info.zone());
return result;
} else if (!lazy) {
// Assert that we are not overwriting (possibly patched) debug code.
DCHECK(!existing->HasDebugCode());
existing->ReplaceCode(*info.code());
existing->set_scope_info(*scope_info);
existing->set_feedback_vector(*info.feedback_vector());
}
return existing;
}
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()));
const int literals = fun->NumberOfLiterals();
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, literals, FunctionKind::kNormalFunction, code,
Handle<ScopeInfo>(fun->shared()->scope_info()),
Handle<TypeFeedbackVector>(fun->shared()->feedback_vector()));
shared->set_construct_stub(*construct_stub);
// 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::GetOptimizedCode(Handle<JSFunction> function,
ConcurrencyMode mode,
BailoutId osr_ast_id,
JavaScriptFrame* osr_frame) {
Isolate* isolate = function->GetIsolate();
Handle<SharedFunctionInfo> shared(function->shared(), isolate);
if (shared->HasDebugInfo()) return MaybeHandle<Code>();
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;
}
DCHECK(AllowCompilation::IsAllowed(isolate));
Handle<Code> current_code(shared->code());
if (!shared->is_compiled() ||
shared->scope_info() == ScopeInfo::Empty(isolate)) {
// The function was never compiled. Compile it unoptimized first.
// TODO(titzer): reuse the AST and scope info from this compile.
CompilationInfoWithZone unoptimized(function);
unoptimized.EnableDeoptimizationSupport();
if (!GetUnoptimizedCodeCommon(&unoptimized).ToHandle(&current_code)) {
return MaybeHandle<Code>();
}
shared->ReplaceCode(*current_code);
}
current_code->set_profiler_ticks(0);
// TODO(mstarzinger): We cannot properly deserialize a scope chain containing
// an eval scope and hence would fail at parsing the eval source again.
if (shared->disable_optimization_reason() == kEval) {
return MaybeHandle<Code>();
}
// TODO(mstarzinger): We cannot properly deserialize a scope chain for the
// builtin context, hence Genesis::InstallExperimentalNatives would fail.
if (shared->is_toplevel() && isolate->bootstrapper()->IsActive()) {
return MaybeHandle<Code>();
}
base::SmartPointer<CompilationInfo> info(
new CompilationInfoWithZone(function));
VMState<COMPILER> state(isolate);
DCHECK(!isolate->has_pending_exception());
PostponeInterruptsScope postpone(isolate);
info->SetOptimizingForOsr(osr_ast_id, current_code);
if (mode == CONCURRENT) {
if (GetOptimizedCodeLater(info.get())) {
info.Detach(); // The background recompile job owns this now.
return isolate->builtins()->InOptimizationQueue();
}
} else {
info->set_osr_frame(osr_frame);
if (GetOptimizedCodeNow(info.get())) return info->code();
}
if (isolate->has_pending_exception()) isolate->clear_pending_exception();
return MaybeHandle<Code>();
}
MaybeHandle<Code> Compiler::GetConcurrentlyOptimizedCode(
OptimizedCompileJob* job) {
// Take ownership of compilation info. Deleting compilation info
// also tears down the zone and the recompile job.
base::SmartPointer<CompilationInfo> info(job->info());
Isolate* isolate = info->isolate();
VMState<COMPILER> state(isolate);
TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
TRACE_EVENT0("v8", "V8.RecompileSynchronous");
Handle<SharedFunctionInfo> shared = info->shared_info();
shared->code()->set_profiler_ticks(0);
DCHECK(!shared->HasDebugInfo());
// 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->last_status() == OptimizedCompileJob::SUCCEEDED) {
if (shared->optimization_disabled()) {
job->RetryOptimization(kOptimizationDisabled);
} else if (info->dependencies()->HasAborted()) {
job->RetryOptimization(kBailedOutDueToDependencyChange);
} else if (job->GenerateCode() == OptimizedCompileJob::SUCCEEDED) {
RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info.get(), shared);
if (shared->SearchOptimizedCodeMap(info->context()->native_context(),
info->osr_ast_id()).code == nullptr) {
InsertCodeIntoOptimizedCodeMap(info.get());
}
if (FLAG_trace_opt) {
PrintF("[completed optimizing ");
info->closure()->ShortPrint();
PrintF("]\n");
}
return Handle<Code>(*info->code());
}
}
DCHECK(job->last_status() != OptimizedCompileJob::SUCCEEDED);
if (FLAG_trace_opt) {
PrintF("[aborted optimizing ");
info->closure()->ShortPrint();
PrintF(" because: %s]\n", GetBailoutReason(info->bailout_reason()));
}
return MaybeHandle<Code>();
}
CompilationPhase::CompilationPhase(const char* name, CompilationInfo* info)
: name_(name), info_(info) {
if (FLAG_hydrogen_stats) {
info_zone_start_allocation_size_ = info->zone()->allocation_size();
timer_.Start();
}
}
CompilationPhase::~CompilationPhase() {
if (FLAG_hydrogen_stats) {
size_t size = zone()->allocation_size();
size += info_->zone()->allocation_size() - info_zone_start_allocation_size_;
isolate()->GetHStatistics()->SaveTiming(name_, timer_.Elapsed(), size);
}
}
bool CompilationPhase::ShouldProduceTraceOutput() const {
// Trace if the appropriate trace flag is set and the phase name's first
// character is in the FLAG_trace_phase command line parameter.
AllowHandleDereference allow_deref;
bool tracing_on = info()->IsStub()
? FLAG_trace_hydrogen_stubs
: (FLAG_trace_hydrogen &&
info()->closure()->PassesFilter(FLAG_trace_hydrogen_filter));
return (tracing_on &&
base::OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
}
#if DEBUG
void CompilationInfo::PrintAstForTesting() {
PrintF("--- Source from AST ---\n%s\n",
PrettyPrinter(isolate()).PrintProgram(literal()));
}
#endif
} // namespace internal
} // namespace v8
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