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v8/src/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 "v8.h"
#include "compiler.h"
#include "bootstrapper.h"
#include "codegen.h"
#include "compilation-cache.h"
#include "cpu-profiler.h"
#include "debug.h"
#include "deoptimizer.h"
#include "full-codegen.h"
#include "gdb-jit.h"
#include "typing.h"
#include "hydrogen.h"
#include "isolate-inl.h"
#include "lithium.h"
#include "liveedit.h"
#include "parser.h"
#include "rewriter.h"
#include "runtime-profiler.h"
#include "scanner-character-streams.h"
#include "scopeinfo.h"
#include "scopes.h"
#include "vm-state-inl.h"
namespace v8 {
namespace internal {
CompilationInfo::CompilationInfo(Handle<Script> script,
Zone* zone)
: flags_(StrictModeField::encode(SLOPPY)),
script_(script),
osr_ast_id_(BailoutId::None()),
parameter_count_(0),
this_has_uses_(true),
optimization_id_(-1) {
Initialize(script->GetIsolate(), BASE, zone);
}
CompilationInfo::CompilationInfo(Handle<SharedFunctionInfo> shared_info,
Zone* zone)
: flags_(StrictModeField::encode(SLOPPY) | IsLazy::encode(true)),
shared_info_(shared_info),
script_(Handle<Script>(Script::cast(shared_info->script()))),
osr_ast_id_(BailoutId::None()),
parameter_count_(0),
this_has_uses_(true),
optimization_id_(-1) {
Initialize(script_->GetIsolate(), BASE, zone);
}
CompilationInfo::CompilationInfo(Handle<JSFunction> closure,
Zone* zone)
: flags_(StrictModeField::encode(SLOPPY) | IsLazy::encode(true)),
closure_(closure),
shared_info_(Handle<SharedFunctionInfo>(closure->shared())),
script_(Handle<Script>(Script::cast(shared_info_->script()))),
context_(closure->context()),
osr_ast_id_(BailoutId::None()),
parameter_count_(0),
this_has_uses_(true),
optimization_id_(-1) {
Initialize(script_->GetIsolate(), BASE, zone);
}
CompilationInfo::CompilationInfo(HydrogenCodeStub* stub,
Isolate* isolate,
Zone* zone)
: flags_(StrictModeField::encode(SLOPPY) | IsLazy::encode(true)),
osr_ast_id_(BailoutId::None()),
parameter_count_(0),
this_has_uses_(true),
optimization_id_(-1) {
Initialize(isolate, STUB, zone);
code_stub_ = stub;
}
void CompilationInfo::Initialize(Isolate* isolate,
Mode mode,
Zone* zone) {
isolate_ = isolate;
function_ = NULL;
scope_ = NULL;
global_scope_ = NULL;
extension_ = NULL;
cached_data_ = NULL;
cached_data_mode_ = NO_CACHED_DATA;
zone_ = zone;
deferred_handles_ = NULL;
code_stub_ = NULL;
prologue_offset_ = Code::kPrologueOffsetNotSet;
opt_count_ = shared_info().is_null() ? 0 : shared_info()->opt_count();
no_frame_ranges_ = isolate->cpu_profiler()->is_profiling()
? new List<OffsetRange>(2) : NULL;
for (int i = 0; i < DependentCode::kGroupCount; i++) {
dependencies_[i] = NULL;
}
if (mode == STUB) {
mode_ = STUB;
return;
}
mode_ = mode;
abort_due_to_dependency_ = false;
if (script_->type()->value() == Script::TYPE_NATIVE) MarkAsNative();
if (isolate_->debugger()->is_active()) MarkAsDebug();
if (!shared_info_.is_null()) {
ASSERT(strict_mode() == SLOPPY);
SetStrictMode(shared_info_->strict_mode());
}
set_bailout_reason(kUnknown);
if (!shared_info().is_null() && 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<FixedArray>(shared_info()->feedback_vector(),
isolate);
}
}
CompilationInfo::~CompilationInfo() {
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.
for (int i = 0; i < DependentCode::kGroupCount; i++) {
ASSERT_EQ(NULL, dependencies_[i]);
}
#endif // DEBUG
}
void CompilationInfo::CommitDependencies(Handle<Code> code) {
for (int i = 0; i < DependentCode::kGroupCount; i++) {
ZoneList<Handle<HeapObject> >* group_objects = dependencies_[i];
if (group_objects == NULL) continue;
ASSERT(!object_wrapper_.is_null());
for (int j = 0; j < group_objects->length(); j++) {
DependentCode::DependencyGroup group =
static_cast<DependentCode::DependencyGroup>(i);
DependentCode* dependent_code =
DependentCode::ForObject(group_objects->at(j), group);
dependent_code->UpdateToFinishedCode(group, this, *code);
}
dependencies_[i] = NULL; // Zone-allocated, no need to delete.
}
}
void CompilationInfo::RollbackDependencies() {
// Unregister from all dependent maps if not yet committed.
for (int i = 0; i < DependentCode::kGroupCount; i++) {
ZoneList<Handle<HeapObject> >* group_objects = dependencies_[i];
if (group_objects == NULL) continue;
for (int j = 0; j < group_objects->length(); j++) {
DependentCode::DependencyGroup group =
static_cast<DependentCode::DependencyGroup>(i);
DependentCode* dependent_code =
DependentCode::ForObject(group_objects->at(j), group);
dependent_code->RemoveCompilationInfo(group, this);
}
dependencies_[i] = NULL; // Zone-allocated, no need to delete.
}
}
int CompilationInfo::num_parameters() const {
if (IsStub()) {
ASSERT(parameter_count_ > 0);
return parameter_count_;
} else {
return scope()->num_parameters();
}
}
int CompilationInfo::num_heap_slots() const {
if (IsStub()) {
return 0;
} else {
return scope()->num_heap_slots();
}
}
Code::Flags CompilationInfo::flags() const {
if (IsStub()) {
return Code::ComputeFlags(code_stub()->GetCodeKind(),
code_stub()->GetICState(),
code_stub()->GetExtraICState(),
code_stub()->GetStubType());
} else {
return Code::ComputeFlags(Code::OPTIMIZED_FUNCTION);
}
}
// Disable optimization for the rest of the compilation pipeline.
void CompilationInfo::DisableOptimization() {
bool is_optimizable_closure =
FLAG_optimize_closures &&
closure_.is_null() &&
!scope_->HasTrivialOuterContext() &&
!scope_->outer_scope_calls_sloppy_eval() &&
!scope_->inside_with();
SetMode(is_optimizable_closure ? BASE : NONOPT);
}
// 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() &&
(shared_info().is_null() || !shared_info()->optimization_disabled());
}
void CompilationInfo::PrepareForCompilation(Scope* scope) {
ASSERT(scope_ == NULL);
scope_ = scope;
int length = function()->slot_count();
if (feedback_vector_.is_null()) {
// Allocate the feedback vector too.
feedback_vector_ = isolate()->factory()->NewTypeFeedbackVector(length);
}
ASSERT(feedback_vector_->length() == length);
}
class HOptimizedGraphBuilderWithPositions: public HOptimizedGraphBuilder {
public:
explicit HOptimizedGraphBuilderWithPositions(CompilationInfo* info)
: HOptimizedGraphBuilder(info) {
}
#define DEF_VISIT(type) \
virtual void Visit##type(type* node) V8_OVERRIDE { \
if (node->position() != RelocInfo::kNoPosition) { \
SetSourcePosition(node->position()); \
} \
HOptimizedGraphBuilder::Visit##type(node); \
}
EXPRESSION_NODE_LIST(DEF_VISIT)
#undef DEF_VISIT
#define DEF_VISIT(type) \
virtual void Visit##type(type* node) V8_OVERRIDE { \
if (node->position() != RelocInfo::kNoPosition) { \
SetSourcePosition(node->position()); \
} \
HOptimizedGraphBuilder::Visit##type(node); \
}
STATEMENT_NODE_LIST(DEF_VISIT)
#undef DEF_VISIT
#define DEF_VISIT(type) \
virtual void Visit##type(type* node) V8_OVERRIDE { \
HOptimizedGraphBuilder::Visit##type(node); \
}
MODULE_NODE_LIST(DEF_VISIT)
DECLARATION_NODE_LIST(DEF_VISIT)
#undef DEF_VISIT
};
OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
ASSERT(isolate()->use_crankshaft());
ASSERT(info()->IsOptimizing());
ASSERT(!info()->IsCompilingForDebugging());
// We should never arrive here if there is no code object on the
// shared function object.
ASSERT(info()->shared_info()->code()->kind() == Code::FUNCTION);
// We should never arrive here if optimization has been disabled on the
// shared function info.
ASSERT(!info()->shared_info()->optimization_disabled());
// Fall back to using the full code generator if it's not possible
// to use the Hydrogen-based optimizing compiler. We already have
// generated code for this from the shared function object.
if (FLAG_always_full_compiler) return AbortOptimization();
// Do not use crankshaft if compiling for debugging.
if (info()->is_debug()) return AbortOptimization(kDebuggerIsActive);
// Limit the number of times we re-compile a functions with
// the optimizing compiler.
const int kMaxOptCount =
FLAG_deopt_every_n_times == 0 ? FLAG_max_opt_count : 1000;
if (info()->opt_count() > kMaxOptCount) {
return AbortAndDisableOptimization(kOptimizedTooManyTimes);
}
// Due to an encoding limit on LUnallocated operands in the Lithium
// language, we cannot optimize functions with too many formal parameters
// or perform on-stack replacement for function with too many
// stack-allocated local variables.
//
// The encoding is as a signed value, with parameters and receiver using
// the negative indices and locals the non-negative ones.
const int parameter_limit = -LUnallocated::kMinFixedSlotIndex;
Scope* scope = info()->scope();
if ((scope->num_parameters() + 1) > parameter_limit) {
return AbortAndDisableOptimization(kTooManyParameters);
}
const int locals_limit = LUnallocated::kMaxFixedSlotIndex;
if (info()->is_osr() &&
scope->num_parameters() + 1 + scope->num_stack_slots() > locals_limit) {
return AbortAndDisableOptimization(kTooManyParametersLocals);
}
if (scope->HasIllegalRedeclaration()) {
return AbortAndDisableOptimization(kFunctionWithIllegalRedeclaration);
}
// Take --hydrogen-filter into account.
if (!info()->closure()->PassesFilter(FLAG_hydrogen_filter)) {
return AbortOptimization(kHydrogenFilter);
}
// Recompile the unoptimized version of the code if the current version
// doesn't have deoptimization support. Alternatively, we may decide to
// run the full code generator to get a baseline for the compile-time
// performance of the hydrogen-based compiler.
bool should_recompile = !info()->shared_info()->has_deoptimization_support();
if (should_recompile || FLAG_hydrogen_stats) {
ElapsedTimer timer;
if (FLAG_hydrogen_stats) {
timer.Start();
}
CompilationInfoWithZone unoptimized(info()->shared_info());
// Note that we use the same AST that we will use for generating the
// optimized code.
unoptimized.SetFunction(info()->function());
unoptimized.PrepareForCompilation(info()->scope());
unoptimized.SetContext(info()->context());
if (should_recompile) unoptimized.EnableDeoptimizationSupport();
bool succeeded = FullCodeGenerator::MakeCode(&unoptimized);
if (should_recompile) {
if (!succeeded) return SetLastStatus(FAILED);
Handle<SharedFunctionInfo> shared = info()->shared_info();
shared->EnableDeoptimizationSupport(*unoptimized.code());
// The existing unoptimized code was replaced with the new one.
Compiler::RecordFunctionCompilation(
Logger::LAZY_COMPILE_TAG, &unoptimized, shared);
}
if (FLAG_hydrogen_stats) {
isolate()->GetHStatistics()->IncrementFullCodeGen(timer.Elapsed());
}
}
// Check that the unoptimized, shared code is ready for
// optimizations. When using the always_opt flag we disregard the
// optimizable marker in the code object and optimize anyway. This
// is safe as long as the unoptimized code has deoptimization
// support.
ASSERT(FLAG_always_opt || info()->shared_info()->code()->optimizable());
ASSERT(info()->shared_info()->has_deoptimization_support());
if (FLAG_trace_hydrogen) {
Handle<String> name = info()->function()->debug_name();
PrintF("-----------------------------------------------------------\n");
PrintF("Compiling method %s using hydrogen\n", name->ToCString().get());
isolate()->GetHTracer()->TraceCompilation(info());
}
// Type-check the function.
AstTyper::Run(info());
graph_builder_ = FLAG_hydrogen_track_positions
? new(info()->zone()) HOptimizedGraphBuilderWithPositions(info())
: new(info()->zone()) HOptimizedGraphBuilder(info());
Timer t(this, &time_taken_to_create_graph_);
info()->set_this_has_uses(false);
graph_ = graph_builder_->CreateGraph();
if (isolate()->has_pending_exception()) {
return SetLastStatus(FAILED);
}
// The function being compiled may have bailed out due to an inline
// candidate bailing out. In such a case, we don't disable
// optimization on the shared_info.
ASSERT(!graph_builder_->inline_bailout() || graph_ == NULL);
if (graph_ == NULL) {
if (graph_builder_->inline_bailout()) {
return AbortOptimization();
} else {
return AbortAndDisableOptimization();
}
}
if (info()->HasAbortedDueToDependencyChange()) {
return AbortOptimization(kBailedOutDueToDependencyChange);
}
return SetLastStatus(SUCCEEDED);
}
OptimizedCompileJob::Status OptimizedCompileJob::OptimizeGraph() {
DisallowHeapAllocation no_allocation;
DisallowHandleAllocation no_handles;
DisallowHandleDereference no_deref;
DisallowCodeDependencyChange no_dependency_change;
ASSERT(last_status() == SUCCEEDED);
Timer t(this, &time_taken_to_optimize_);
ASSERT(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 AbortOptimization();
}
OptimizedCompileJob::Status OptimizedCompileJob::GenerateCode() {
ASSERT(last_status() == SUCCEEDED);
ASSERT(!info()->HasAbortedDueToDependencyChange());
DisallowCodeDependencyChange no_dependency_change;
{ // Scope for timer.
Timer timer(this, &time_taken_to_codegen_);
ASSERT(chunk_ != NULL);
ASSERT(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) {
info_->set_bailout_reason(kCodeGenerationFailed);
} else if (info()->bailout_reason() == kMapBecameUnstable) {
return AbortOptimization();
}
return AbortAndDisableOptimization();
}
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) {
// See the comment in SetExpectedNofProperties.
if (shared->live_objects_may_exist()) return;
// 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 if (FLAG_clever_optimizations) {
// Inobject slack tracking will reclaim redundant inobject space later,
// so we can afford to adjust the estimate generously.
estimate += 8;
} else {
estimate += 3;
}
shared->set_expected_nof_properties(estimate);
}
static void UpdateSharedFunctionInfo(CompilationInfo* info) {
// Update the shared function info with the compiled code and the
// scope info. Please note, that the order of the shared function
// info initialization is important since set_scope_info might
// trigger a GC, causing the ASSERT below to be invalid if the code
// was flushed. By setting the code object last we avoid this.
Handle<SharedFunctionInfo> shared = info->shared_info();
Handle<ScopeInfo> scope_info =
ScopeInfo::Create(info->scope(), info->zone());
shared->set_scope_info(*scope_info);
Handle<Code> code = info->code();
CHECK(code->kind() == Code::FUNCTION);
shared->ReplaceCode(*code);
if (shared->optimization_disabled()) code->set_optimizable(false);
shared->set_feedback_vector(*info->feedback_vector());
// Set the expected number of properties for instances.
FunctionLiteral* lit = info->function();
int expected = lit->expected_property_count();
SetExpectedNofPropertiesFromEstimate(shared, expected);
// Check the function has compiled code.
ASSERT(shared->is_compiled());
shared->set_dont_optimize_reason(lit->dont_optimize_reason());
shared->set_dont_inline(lit->flags()->Contains(kDontInline));
shared->set_ast_node_count(lit->ast_node_count());
shared->set_strict_mode(lit->strict_mode());
}
// Sets the function info on a function.
// The start_position points to the first '(' character after the function name
// in the full script source. When counting characters in the script source the
// the first character is number 0 (not 1).
static void SetFunctionInfo(Handle<SharedFunctionInfo> function_info,
FunctionLiteral* lit,
bool is_toplevel,
Handle<Script> script) {
function_info->set_length(lit->parameter_count());
function_info->set_formal_parameter_count(lit->parameter_count());
function_info->set_script(*script);
function_info->set_function_token_position(lit->function_token_position());
function_info->set_start_position(lit->start_position());
function_info->set_end_position(lit->end_position());
function_info->set_is_expression(lit->is_expression());
function_info->set_is_anonymous(lit->is_anonymous());
function_info->set_is_toplevel(is_toplevel);
function_info->set_inferred_name(*lit->inferred_name());
function_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation());
function_info->set_allows_lazy_compilation_without_context(
lit->AllowsLazyCompilationWithoutContext());
function_info->set_strict_mode(lit->strict_mode());
function_info->set_uses_arguments(lit->scope()->arguments() != NULL);
function_info->set_has_duplicate_parameters(lit->has_duplicate_parameters());
function_info->set_ast_node_count(lit->ast_node_count());
function_info->set_is_function(lit->is_function());
function_info->set_dont_optimize_reason(lit->dont_optimize_reason());
function_info->set_dont_inline(lit->flags()->Contains(kDontInline));
function_info->set_dont_cache(lit->flags()->Contains(kDontCache));
function_info->set_is_generator(lit->is_generator());
}
static bool CompileUnoptimizedCode(CompilationInfo* info) {
ASSERT(info->function() != NULL);
if (!Rewriter::Rewrite(info)) return false;
if (!Scope::Analyze(info)) return false;
ASSERT(info->scope() != NULL);
if (!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());
if (!Parser::Parse(info)) return MaybeHandle<Code>();
info->SetStrictMode(info->function()->strict_mode());
if (!CompileUnoptimizedCode(info)) return MaybeHandle<Code>();
Compiler::RecordFunctionCompilation(
Logger::LAZY_COMPILE_TAG, info, info->shared_info());
UpdateSharedFunctionInfo(info);
ASSERT_EQ(Code::FUNCTION, info->code()->kind());
return info->code();
}
MaybeHandle<Code> Compiler::GetUnoptimizedCode(Handle<JSFunction> function) {
ASSERT(!function->GetIsolate()->has_pending_exception());
ASSERT(!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);
if (FLAG_always_opt &&
info.isolate()->use_crankshaft() &&
!info.shared_info()->optimization_disabled() &&
!info.isolate()->DebuggerHasBreakPoints()) {
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) {
ASSERT(!shared->GetIsolate()->has_pending_exception());
ASSERT(!shared->is_compiled());
CompilationInfoWithZone info(shared);
return GetUnoptimizedCodeCommon(&info);
}
bool Compiler::EnsureCompiled(Handle<JSFunction> function,
ClearExceptionFlag flag) {
if (function->is_compiled()) return true;
MaybeHandle<Code> maybe_code = Compiler::GetUnoptimizedCode(function);
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
if (flag == CLEAR_EXCEPTION) {
function->GetIsolate()->clear_pending_exception();
}
return false;
}
function->ReplaceCode(*code);
ASSERT(function->is_compiled());
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::GetCodeForDebugging(Handle<JSFunction> function) {
CompilationInfoWithZone info(function);
Isolate* isolate = info.isolate();
VMState<COMPILER> state(isolate);
info.MarkAsDebug();
ASSERT(!isolate->has_pending_exception());
Handle<Code> old_code(function->shared()->code());
ASSERT(old_code->kind() == Code::FUNCTION);
ASSERT(!old_code->has_debug_break_slots());
info.MarkCompilingForDebugging();
if (old_code->is_compiled_optimizable()) {
info.EnableDeoptimizationSupport();
} else {
info.MarkNonOptimizable();
}
MaybeHandle<Code> maybe_new_code = GetUnoptimizedCodeCommon(&info);
Handle<Code> new_code;
if (!maybe_new_code.ToHandle(&new_code)) {
isolate->clear_pending_exception();
} else {
ASSERT_EQ(old_code->is_compiled_optimizable(),
new_code->is_compiled_optimizable());
}
return maybe_new_code;
}
void Compiler::CompileForLiveEdit(Handle<Script> script) {
// TODO(635): support extensions.
CompilationInfoWithZone info(script);
PostponeInterruptsScope postpone(info.isolate());
VMState<COMPILER> state(info.isolate());
info.MarkAsGlobal();
if (!Parser::Parse(&info)) return;
info.SetStrictMode(info.function()->strict_mode());
LiveEditFunctionTracker tracker(info.isolate(), info.function());
if (!CompileUnoptimizedCode(&info)) return;
if (!info.shared_info().is_null()) {
Handle<ScopeInfo> scope_info = ScopeInfo::Create(info.scope(),
info.zone());
info.shared_info()->set_scope_info(*scope_info);
}
tracker.RecordRootFunctionInfo(info.code());
}
static bool DebuggerWantsEagerCompilation(CompilationInfo* info,
bool allow_lazy_without_ctx = false) {
return LiveEditFunctionTracker::IsActive(info->isolate()) ||
(info->isolate()->DebuggerHasBreakPoints() && !allow_lazy_without_ctx);
}
static Handle<SharedFunctionInfo> CompileToplevel(CompilationInfo* info) {
Isolate* isolate = info->isolate();
PostponeInterruptsScope postpone(isolate);
ASSERT(!isolate->native_context().is_null());
Handle<Script> script = 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(0));
isolate->debugger()->OnBeforeCompile(script);
ASSERT(info->is_eval() || info->is_global());
bool parse_allow_lazy =
(info->cached_data_mode() == CONSUME_CACHED_DATA ||
String::cast(script->source())->length() > FLAG_min_preparse_length) &&
!DebuggerWantsEagerCompilation(info);
if (!parse_allow_lazy && info->cached_data_mode() != NO_CACHED_DATA) {
// 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. We cannot use
// the existing data, since it won't contain all the symbols we need for
// eager parsing. In addition, it doesn't make sense to produce the data
// when parsing eagerly. That data would contain all symbols, but no
// functions, so it cannot be used to aid lazy parsing later.
info->SetCachedData(NULL, NO_CACHED_DATA);
}
Handle<SharedFunctionInfo> result;
{ VMState<COMPILER> state(info->isolate());
if (!Parser::Parse(info, parse_allow_lazy)) {
return Handle<SharedFunctionInfo>::null();
}
FunctionLiteral* lit = info->function();
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);
// Compile the code.
if (!CompileUnoptimizedCode(info)) {
return Handle<SharedFunctionInfo>::null();
}
// Allocate function.
ASSERT(!info->code().is_null());
result = isolate->factory()->NewSharedFunctionInfo(
lit->name(),
lit->materialized_literal_count(),
lit->is_generator(),
info->code(),
ScopeInfo::Create(info->scope(), info->zone()),
info->feedback_vector());
ASSERT_EQ(RelocInfo::kNoPosition, lit->function_token_position());
SetFunctionInfo(result, lit, true, script);
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->code(), *result, info, *script_name));
GDBJIT(AddCode(script_name, script, info->code(), info));
// 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());
script->set_compilation_state(Script::COMPILATION_STATE_COMPILED);
live_edit_tracker.RecordFunctionInfo(result, lit, info->zone());
}
isolate->debugger()->OnAfterCompile(script, Debugger::NO_AFTER_COMPILE_FLAGS);
return result;
}
MaybeHandle<JSFunction> Compiler::GetFunctionFromEval(
Handle<String> source,
Handle<Context> context,
StrictMode strict_mode,
ParseRestriction restriction,
int scope_position) {
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, context, strict_mode,
scope_position);
Handle<SharedFunctionInfo> shared_info;
if (!maybe_shared_info.ToHandle(&shared_info)) {
Handle<Script> script = isolate->factory()->NewScript(source);
CompilationInfoWithZone info(script);
info.MarkAsEval();
if (context->IsNativeContext()) info.MarkAsGlobal();
info.SetStrictMode(strict_mode);
info.SetParseRestriction(restriction);
info.SetContext(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.
shared_info->DisableOptimization(kEval);
// If caller is strict mode, the result must be in strict mode as well.
ASSERT(strict_mode == SLOPPY || shared_info->strict_mode() == STRICT);
if (!shared_info->dont_cache()) {
compilation_cache->PutEval(
source, context, shared_info, scope_position);
}
}
} else if (shared_info->ic_age() != isolate->heap()->global_ic_age()) {
shared_info->ResetForNewContext(isolate->heap()->global_ic_age());
}
return isolate->factory()->NewFunctionFromSharedFunctionInfo(
shared_info, context, NOT_TENURED);
}
Handle<SharedFunctionInfo> Compiler::CompileScript(
Handle<String> source,
Handle<Object> script_name,
int line_offset,
int column_offset,
bool is_shared_cross_origin,
Handle<Context> context,
v8::Extension* extension,
ScriptData** cached_data,
CachedDataMode cached_data_mode,
NativesFlag natives) {
if (cached_data_mode == NO_CACHED_DATA) {
cached_data = NULL;
} else if (cached_data_mode == PRODUCE_CACHED_DATA) {
ASSERT(cached_data && !*cached_data);
} else {
ASSERT(cached_data_mode == CONSUME_CACHED_DATA);
ASSERT(cached_data && *cached_data);
}
Isolate* isolate = source->GetIsolate();
int source_length = source->length();
isolate->counters()->total_load_size()->Increment(source_length);
isolate->counters()->total_compile_size()->Increment(source_length);
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) {
maybe_result = compilation_cache->LookupScript(
source, script_name, line_offset, column_offset,
is_shared_cross_origin, context);
}
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(Smi::FromInt(Script::TYPE_NATIVE));
}
if (!script_name.is_null()) {
script->set_name(*script_name);
script->set_line_offset(Smi::FromInt(line_offset));
script->set_column_offset(Smi::FromInt(column_offset));
}
script->set_is_shared_cross_origin(is_shared_cross_origin);
// Compile the function and add it to the cache.
CompilationInfoWithZone info(script);
info.MarkAsGlobal();
info.SetExtension(extension);
info.SetCachedData(cached_data, cached_data_mode);
info.SetContext(context);
if (FLAG_use_strict) info.SetStrictMode(STRICT);
result = CompileToplevel(&info);
if (extension == NULL && !result.is_null() && !result->dont_cache()) {
compilation_cache->PutScript(source, context, result);
}
if (result.is_null()) isolate->ReportPendingMessages();
} else if (result->ic_age() != isolate->heap()->global_ic_age()) {
result->ResetForNewContext(isolate->heap()->global_ic_age());
}
return result;
}
Handle<SharedFunctionInfo> Compiler::BuildFunctionInfo(FunctionLiteral* literal,
Handle<Script> script) {
// Precondition: code has been parsed and scopes have been analyzed.
CompilationInfoWithZone info(script);
info.SetFunction(literal);
info.PrepareForCompilation(literal->scope());
info.SetStrictMode(literal->scope()->strict_mode());
Isolate* isolate = info.isolate();
Factory* factory = isolate->factory();
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();
bool allow_lazy = literal->AllowsLazyCompilation() &&
!DebuggerWantsEagerCompilation(&info, allow_lazy_without_ctx);
// Generate code
Handle<ScopeInfo> scope_info;
if (FLAG_lazy && allow_lazy && !literal->is_parenthesized()) {
Handle<Code> code = isolate->builtins()->CompileUnoptimized();
info.SetCode(code);
scope_info = Handle<ScopeInfo>(ScopeInfo::Empty(isolate));
} else if (FullCodeGenerator::MakeCode(&info)) {
ASSERT(!info.code().is_null());
scope_info = ScopeInfo::Create(info.scope(), info.zone());
} else {
return Handle<SharedFunctionInfo>::null();
}
// Create a shared function info object.
Handle<SharedFunctionInfo> result =
factory->NewSharedFunctionInfo(literal->name(),
literal->materialized_literal_count(),
literal->is_generator(),
info.code(),
scope_info,
info.feedback_vector());
SetFunctionInfo(result, literal, false, script);
RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, result);
result->set_allows_lazy_compilation(allow_lazy);
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;
}
MUST_USE_RESULT static MaybeHandle<Code> GetCodeFromOptimizedCodeMap(
Handle<JSFunction> function,
BailoutId osr_ast_id) {
if (FLAG_cache_optimized_code) {
Handle<SharedFunctionInfo> shared(function->shared());
DisallowHeapAllocation no_gc;
int index = shared->SearchOptimizedCodeMap(
function->context()->native_context(), osr_ast_id);
if (index > 0) {
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");
}
FixedArray* literals = shared->GetLiteralsFromOptimizedCodeMap(index);
if (literals != NULL) function->set_literals(literals);
return Handle<Code>(shared->GetCodeFromOptimizedCodeMap(index));
}
}
return MaybeHandle<Code>();
}
static void InsertCodeIntoOptimizedCodeMap(CompilationInfo* info) {
Handle<Code> code = info->code();
if (code->kind() != Code::OPTIMIZED_FUNCTION) return; // Nothing to do.
// Cache optimized code.
if (FLAG_cache_optimized_code) {
Handle<JSFunction> function = info->closure();
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());
}
}
static bool CompileOptimizedPrologue(CompilationInfo* info) {
if (!Parser::Parse(info)) return false;
info->SetStrictMode(info->function()->strict_mode());
if (!Rewriter::Rewrite(info)) return false;
if (!Scope::Analyze(info)) return false;
ASSERT(info->scope() != NULL);
return true;
}
static bool GetOptimizedCodeNow(CompilationInfo* info) {
if (!CompileOptimizedPrologue(info)) return false;
Logger::TimerEventScope timer(
info->isolate(), Logger::TimerEventScope::v8_recompile_synchronous);
OptimizedCompileJob job(info);
if (job.CreateGraph() != OptimizedCompileJob::SUCCEEDED) return false;
if (job.OptimizeGraph() != OptimizedCompileJob::SUCCEEDED) return false;
if (job.GenerateCode() != OptimizedCompileJob::SUCCEEDED) return false;
// Success!
ASSERT(!info->isolate()->has_pending_exception());
InsertCodeIntoOptimizedCodeMap(info);
Compiler::RecordFunctionCompilation(
Logger::LAZY_COMPILE_TAG, info, info->shared_info());
return true;
}
static bool GetOptimizedCodeLater(CompilationInfo* info) {
Isolate* isolate = info->isolate();
if (!isolate->optimizing_compiler_thread()->IsQueueAvailable()) {
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Compilation queue full, will retry optimizing ");
info->closure()->PrintName();
PrintF(" later.\n");
}
return false;
}
CompilationHandleScope handle_scope(info);
if (!CompileOptimizedPrologue(info)) return false;
info->SaveHandles(); // Copy handles to the compilation handle scope.
Logger::TimerEventScope timer(
isolate, Logger::TimerEventScope::v8_recompile_synchronous);
OptimizedCompileJob* job = new(info->zone()) OptimizedCompileJob(info);
OptimizedCompileJob::Status status = job->CreateGraph();
if (status != OptimizedCompileJob::SUCCEEDED) return false;
isolate->optimizing_compiler_thread()->QueueForOptimization(job);
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Queued ");
info->closure()->PrintName();
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::GetOptimizedCode(Handle<JSFunction> function,
Handle<Code> current_code,
ConcurrencyMode mode,
BailoutId osr_ast_id) {
Handle<Code> cached_code;
if (GetCodeFromOptimizedCodeMap(
function, osr_ast_id).ToHandle(&cached_code)) {
return cached_code;
}
SmartPointer<CompilationInfo> info(new CompilationInfoWithZone(function));
Isolate* isolate = info->isolate();
VMState<COMPILER> state(isolate);
ASSERT(!isolate->has_pending_exception());
PostponeInterruptsScope postpone(isolate);
Handle<SharedFunctionInfo> shared = info->shared_info();
ASSERT_NE(ScopeInfo::Empty(isolate), shared->scope_info());
int compiled_size = shared->end_position() - shared->start_position();
isolate->counters()->total_compile_size()->Increment(compiled_size);
current_code->set_profiler_ticks(0);
info->SetOptimizing(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 {
if (GetOptimizedCodeNow(info.get())) return info->code();
}
// Failed.
if (FLAG_trace_opt) {
PrintF("[failed to optimize ");
function->PrintName();
PrintF(": %s]\n", GetBailoutReason(info->bailout_reason()));
}
if (isolate->has_pending_exception()) isolate->clear_pending_exception();
return MaybeHandle<Code>();
}
Handle<Code> Compiler::GetConcurrentlyOptimizedCode(OptimizedCompileJob* job) {
// Take ownership of compilation info. Deleting compilation info
// also tears down the zone and the recompile job.
SmartPointer<CompilationInfo> info(job->info());
Isolate* isolate = info->isolate();
VMState<COMPILER> state(isolate);
Logger::TimerEventScope timer(
isolate, Logger::TimerEventScope::v8_recompile_synchronous);
Handle<SharedFunctionInfo> shared = info->shared_info();
shared->code()->set_profiler_ticks(0);
// 1) Optimization 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) Debugger may have been activated.
if (job->last_status() != OptimizedCompileJob::SUCCEEDED ||
shared->optimization_disabled() ||
info->HasAbortedDueToDependencyChange() ||
isolate->DebuggerHasBreakPoints()) {
return Handle<Code>::null();
}
if (job->GenerateCode() != OptimizedCompileJob::SUCCEEDED) {
return Handle<Code>::null();
}
Compiler::RecordFunctionCompilation(
Logger::LAZY_COMPILE_TAG, info.get(), shared);
if (info->shared_info()->SearchOptimizedCodeMap(
info->context()->native_context(), info->osr_ast_id()) == -1) {
InsertCodeIntoOptimizedCodeMap(info.get());
}
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Optimized code for ");
info->closure()->PrintName();
PrintF(" generated.\n");
}
return Handle<Code>(*info->code());
}
void Compiler::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->script();
Handle<Code> code = info->code();
if (code.is_identical_to(
info->isolate()->builtins()->CompileUnoptimized())) {
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));
}
GDBJIT(AddCode(Handle<String>(shared->DebugName()),
Handle<Script>(info->script()),
Handle<Code>(info->code()),
info));
}
CompilationPhase::CompilationPhase(const char* name, CompilationInfo* info)
: name_(name), info_(info), zone_(info->isolate()) {
if (FLAG_hydrogen_stats) {
info_zone_start_allocation_size_ = info->zone()->allocation_size();
timer_.Start();
}
}
CompilationPhase::~CompilationPhase() {
if (FLAG_hydrogen_stats) {
unsigned 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 &&
OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
}
} } // namespace v8::internal
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