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