// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/parsing/parse-info.h"
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#include "src/ast/ast-source-ranges.h"
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#include "src/ast/ast-value-factory.h"
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#include "src/ast/ast.h"
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#include "src/base/template-utils.h"
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#include "src/heap/heap-inl.h"
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#include "src/objects-inl.h"
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#include "src/objects/scope-info.h"
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#include "src/zone/zone.h"
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namespace v8 {
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namespace internal {
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ParseInfo::ParseInfo(Isolate* isolate, AccountingAllocator* zone_allocator)
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: zone_(base::make_unique<Zone>(zone_allocator, ZONE_NAME)),
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flags_(0),
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extension_(nullptr),
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script_scope_(nullptr),
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unicode_cache_(nullptr),
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stack_limit_(0),
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hash_seed_(0),
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function_kind_(FunctionKind::kNormalFunction),
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script_id_(-1),
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start_position_(0),
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end_position_(0),
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parameters_end_pos_(kNoSourcePosition),
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function_literal_id_(FunctionLiteral::kIdTypeInvalid),
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max_function_literal_id_(FunctionLiteral::kIdTypeInvalid),
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character_stream_(nullptr),
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ast_value_factory_(nullptr),
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ast_string_constants_(nullptr),
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function_name_(nullptr),
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runtime_call_stats_(nullptr),
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source_range_map_(nullptr),
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literal_(nullptr) {
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set_hash_seed(isolate->heap()->HashSeed());
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set_stack_limit(isolate->stack_guard()->real_climit());
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set_unicode_cache(isolate->unicode_cache());
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set_runtime_call_stats(isolate->counters()->runtime_call_stats());
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set_logger(isolate->logger());
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set_ast_string_constants(isolate->ast_string_constants());
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if (isolate->is_block_code_coverage()) set_block_coverage_enabled();
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if (isolate->is_collecting_type_profile()) set_collect_type_profile();
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}
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ParseInfo::ParseInfo(Isolate* isolate)
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: ParseInfo(isolate, isolate->allocator()) {
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script_id_ = isolate->heap()->NextScriptId();
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LOG(isolate, ScriptEvent(Logger::ScriptEventType::kReserveId, script_id_));
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}
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ParseInfo::ParseInfo(Isolate* isolate, Handle<SharedFunctionInfo> shared)
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: ParseInfo(isolate, isolate->allocator()) {
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// Do not support re-parsing top-level function of a wrapped script.
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// TODO(yangguo): consider whether we need a top-level function in a
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// wrapped script at all.
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DCHECK_IMPLIES(is_toplevel(), !Script::cast(shared->script())->is_wrapped());
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set_toplevel(shared->is_toplevel());
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set_wrapped_as_function(shared->is_wrapped());
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set_allow_lazy_parsing(FLAG_lazy_inner_functions);
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set_is_named_expression(shared->is_named_expression());
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set_start_position(shared->StartPosition());
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set_end_position(shared->EndPosition());
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function_literal_id_ = shared->FunctionLiteralId(isolate);
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set_language_mode(shared->language_mode());
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set_function_kind(shared->kind());
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set_declaration(shared->is_declaration());
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set_requires_instance_fields_initializer(
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shared->requires_instance_fields_initializer());
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set_asm_wasm_broken(shared->is_asm_wasm_broken());
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Handle<Script> script(Script::cast(shared->script()), isolate);
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set_script(script);
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if (shared->HasOuterScopeInfo()) {
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set_outer_scope_info(handle(shared->GetOuterScopeInfo(), isolate));
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}
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// CollectTypeProfile uses its own feedback slots. If we have existing
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// FeedbackMetadata, we can only collect type profile if the feedback vector
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// has the appropriate slots.
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set_collect_type_profile(
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isolate->is_collecting_type_profile() &&
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(shared->HasFeedbackMetadata()
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? shared->feedback_metadata()->HasTypeProfileSlot()
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: script->IsUserJavaScript()));
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}
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ParseInfo::ParseInfo(Isolate* isolate, Handle<Script> script)
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: ParseInfo(isolate, isolate->allocator()) {
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SetScriptForToplevelCompile(isolate, script);
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set_collect_type_profile(isolate->is_collecting_type_profile() &&
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script->IsUserJavaScript());
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}
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ParseInfo::~ParseInfo() {}
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DeclarationScope* ParseInfo::scope() const { return literal()->scope(); }
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void ParseInfo::EmitBackgroundParseStatisticsOnBackgroundThread() {
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// If runtime call stats was enabled by tracing, emit a trace event at the
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// end of background parsing on the background thread.
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if (runtime_call_stats_ &&
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(FLAG_runtime_stats &
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v8::tracing::TracingCategoryObserver::ENABLED_BY_TRACING)) {
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auto value = v8::tracing::TracedValue::Create();
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runtime_call_stats_->Dump(value.get());
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TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"),
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"V8.RuntimeStats", TRACE_EVENT_SCOPE_THREAD,
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"runtime-call-stats", std::move(value));
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}
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}
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void ParseInfo::UpdateBackgroundParseStatisticsOnMainThread(Isolate* isolate) {
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// Copy over the counters from the background thread to the main counters on
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// the isolate.
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RuntimeCallStats* main_call_stats = isolate->counters()->runtime_call_stats();
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if (FLAG_runtime_stats ==
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v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE) {
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DCHECK_NE(main_call_stats, runtime_call_stats());
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DCHECK_NOT_NULL(main_call_stats);
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DCHECK_NOT_NULL(runtime_call_stats());
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main_call_stats->Add(runtime_call_stats());
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}
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set_runtime_call_stats(main_call_stats);
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}
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Handle<Script> ParseInfo::CreateScript(Isolate* isolate, Handle<String> source,
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ScriptOriginOptions origin_options,
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NativesFlag natives) {
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// Create a script object describing the script to be compiled.
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Handle<Script> script;
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if (script_id_ == -1) {
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script = isolate->factory()->NewScript(source);
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} else {
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script = isolate->factory()->NewScriptWithId(source, script_id_);
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}
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if (isolate->NeedsSourcePositionsForProfiling()) {
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Script::InitLineEnds(script);
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}
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switch (natives) {
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case NATIVES_CODE:
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script->set_type(Script::TYPE_NATIVE);
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break;
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case EXTENSION_CODE:
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script->set_type(Script::TYPE_EXTENSION);
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break;
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case INSPECTOR_CODE:
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script->set_type(Script::TYPE_INSPECTOR);
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break;
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case NOT_NATIVES_CODE:
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break;
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}
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script->set_origin_options(origin_options);
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SetScriptForToplevelCompile(isolate, script);
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return script;
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}
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AstValueFactory* ParseInfo::GetOrCreateAstValueFactory() {
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if (!ast_value_factory_.get()) {
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ast_value_factory_.reset(
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new AstValueFactory(zone(), ast_string_constants(), hash_seed()));
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}
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return ast_value_factory();
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}
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void ParseInfo::AllocateSourceRangeMap() {
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DCHECK(block_coverage_enabled());
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set_source_range_map(new (zone()) SourceRangeMap(zone()));
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}
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void ParseInfo::ResetCharacterStream() { character_stream_.reset(); }
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void ParseInfo::set_character_stream(
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std::unique_ptr<Utf16CharacterStream> character_stream) {
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DCHECK_NULL(character_stream_);
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character_stream_.swap(character_stream);
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}
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void ParseInfo::SetScriptForToplevelCompile(Isolate* isolate,
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Handle<Script> script) {
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set_script(script);
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set_allow_lazy_parsing();
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set_toplevel();
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set_collect_type_profile(isolate->is_collecting_type_profile() &&
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script->IsUserJavaScript());
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set_wrapped_as_function(script->is_wrapped());
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}
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void ParseInfo::set_script(Handle<Script> script) {
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script_ = script;
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DCHECK(script_id_ == -1 || script_id_ == script->id());
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script_id_ = script->id();
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set_native(script->type() == Script::TYPE_NATIVE);
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set_eval(script->compilation_type() == Script::COMPILATION_TYPE_EVAL);
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set_module(script->origin_options().IsModule());
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DCHECK(!(is_eval() && is_module()));
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if (block_coverage_enabled() && script->IsUserJavaScript()) {
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AllocateSourceRangeMap();
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}
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}
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} // namespace internal
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} // namespace v8
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