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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/compiler-dispatcher/compiler-dispatcher-job.h"
#include "src/assert-scope.h"
#include "src/global-handles.h"
#include "src/isolate.h"
#include "src/objects-inl.h"
#include "src/parsing/parse-info.h"
#include "src/parsing/parser.h"
#include "src/parsing/scanner-character-streams.h"
#include "src/unicode-cache.h"
#include "src/zone.h"
namespace v8 {
namespace internal {
CompilerDispatcherJob::CompilerDispatcherJob(Isolate* isolate,
Handle<JSFunction> function,
size_t max_stack_size)
: isolate_(isolate),
function_(Handle<JSFunction>::cast(
isolate_->global_handles()->Create(*function))),
max_stack_size_(max_stack_size) {
HandleScope scope(isolate_);
Handle<SharedFunctionInfo> shared(function_->shared(), isolate_);
Handle<Script> script(Script::cast(shared->script()), isolate_);
Handle<String> source(String::cast(script->source()), isolate_);
can_parse_on_background_thread_ =
source->IsExternalTwoByteString() || source->IsExternalOneByteString();
}
CompilerDispatcherJob::~CompilerDispatcherJob() {
DCHECK(ThreadId::Current().Equals(isolate_->thread_id()));
DCHECK(status_ == CompileJobStatus::kInitial ||
status_ == CompileJobStatus::kDone);
i::GlobalHandles::Destroy(Handle<Object>::cast(function_).location());
}
void CompilerDispatcherJob::PrepareToParseOnMainThread() {
DCHECK(ThreadId::Current().Equals(isolate_->thread_id()));
DCHECK(status() == CompileJobStatus::kInitial);
HandleScope scope(isolate_);
unicode_cache_.reset(new UnicodeCache());
zone_.reset(new Zone(isolate_->allocator()));
Handle<SharedFunctionInfo> shared(function_->shared(), isolate_);
Handle<Script> script(Script::cast(shared->script()), isolate_);
DCHECK(script->type() != Script::TYPE_NATIVE);
Handle<String> source(String::cast(script->source()), isolate_);
if (source->IsExternalTwoByteString()) {
character_stream_.reset(new ExternalTwoByteStringUtf16CharacterStream(
Handle<ExternalTwoByteString>::cast(source), shared->start_position(),
shared->end_position()));
} else if (source->IsExternalOneByteString()) {
character_stream_.reset(new ExternalOneByteStringUtf16CharacterStream(
Handle<ExternalOneByteString>::cast(source), shared->start_position(),
shared->end_position()));
} else {
source = String::Flatten(source);
// Have to globalize the reference here, so it survives between function
// calls.
source_ = Handle<String>::cast(isolate_->global_handles()->Create(*source));
character_stream_.reset(new GenericStringUtf16CharacterStream(
source_, shared->start_position(), shared->end_position()));
}
parse_info_.reset(new ParseInfo(zone_.get()));
parse_info_->set_isolate(isolate_);
parse_info_->set_character_stream(character_stream_.get());
parse_info_->set_lazy();
parse_info_->set_hash_seed(isolate_->heap()->HashSeed());
parse_info_->set_is_named_expression(shared->is_named_expression());
parse_info_->set_calls_eval(shared->scope_info()->CallsEval());
parse_info_->set_compiler_hints(shared->compiler_hints());
parse_info_->set_start_position(shared->start_position());
parse_info_->set_end_position(shared->end_position());
parse_info_->set_unicode_cache(unicode_cache_.get());
parse_info_->set_language_mode(shared->language_mode());
parser_.reset(new Parser(parse_info_.get()));
parser_->DeserializeScopeChain(
parse_info_.get(), handle(function_->context(), isolate_),
Scope::DeserializationMode::kDeserializeOffHeap);
Handle<String> name(String::cast(shared->name()));
parse_info_->set_function_name(
parse_info_->ast_value_factory()->GetString(name));
status_ = CompileJobStatus::kReadyToParse;
}
void CompilerDispatcherJob::Parse() {
DCHECK(can_parse_on_background_thread_ ||
ThreadId::Current().Equals(isolate_->thread_id()));
DCHECK(status() == CompileJobStatus::kReadyToParse);
DisallowHeapAllocation no_allocation;
DisallowHandleAllocation no_handles;
std::unique_ptr<DisallowHandleDereference> no_deref;
// If we can't parse on a background thread, we need to be able to deref the
// source string.
if (can_parse_on_background_thread_) {
no_deref.reset(new DisallowHandleDereference());
}
// Nullify the Isolate temporarily so that the parser doesn't accidentally
// use it.
parse_info_->set_isolate(nullptr);
uintptr_t stack_limit =
reinterpret_cast<uintptr_t>(&stack_limit) - max_stack_size_ * KB;
parser_->set_stack_limit(stack_limit);
parser_->ParseOnBackground(parse_info_.get());
parse_info_->set_isolate(isolate_);
status_ = CompileJobStatus::kParsed;
}
bool CompilerDispatcherJob::FinalizeParsingOnMainThread() {
DCHECK(ThreadId::Current().Equals(isolate_->thread_id()));
DCHECK(status() == CompileJobStatus::kParsed);
if (!source_.is_null()) {
i::GlobalHandles::Destroy(Handle<Object>::cast(source_).location());
source_ = Handle<String>::null();
}
if (parse_info_->literal() == nullptr) {
status_ = CompileJobStatus::kFailed;
} else {
status_ = CompileJobStatus::kReadyToCompile;
}
DeferredHandleScope scope(isolate_);
{
// Create a canonical handle scope before internalizing parsed values if
// compiling bytecode. This is required for off-thread bytecode generation.
std::unique_ptr<CanonicalHandleScope> canonical;
if (FLAG_ignition) canonical.reset(new CanonicalHandleScope(isolate_));
Handle<SharedFunctionInfo> shared(function_->shared(), isolate_);
Handle<Script> script(Script::cast(shared->script()), isolate_);
parse_info_->set_script(script);
parse_info_->set_context(handle(function_->context(), isolate_));
// Do the parsing tasks which need to be done on the main thread. This will
// also handle parse errors.
parser_->Internalize(isolate_, script, parse_info_->literal() == nullptr);
parser_->HandleSourceURLComments(isolate_, script);
parse_info_->set_character_stream(nullptr);
parse_info_->set_unicode_cache(nullptr);
parser_.reset();
unicode_cache_.reset();
character_stream_.reset();
}
handles_from_parsing_.reset(scope.Detach());
return status_ != CompileJobStatus::kFailed;
}
void CompilerDispatcherJob::ResetOnMainThread() {
DCHECK(ThreadId::Current().Equals(isolate_->thread_id()));
parser_.reset();
unicode_cache_.reset();
character_stream_.reset();
parse_info_.reset();
zone_.reset();
handles_from_parsing_.reset();
if (!source_.is_null()) {
i::GlobalHandles::Destroy(Handle<Object>::cast(source_).location());
source_ = Handle<String>::null();
}
status_ = CompileJobStatus::kInitial;
}
} // namespace internal
} // namespace v8
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