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// Copyright 2014 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/background-parsing-task.h"
#include "src/debug/debug.h"
#include "src/parsing/parser.h"
namespace v8 {
namespace internal {
void StreamedSource::Release() {
parser.reset();
info.reset();
zone.reset();
}
BackgroundParsingTask::BackgroundParsingTask(
StreamedSource* source, ScriptCompiler::CompileOptions options,
int stack_size, Isolate* isolate)
: source_(source), stack_size_(stack_size), script_data_(nullptr) {
// We don't set the context to the CompilationInfo yet, because the background
// thread cannot do anything with it anyway. We set it just before compilation
// on the foreground thread.
DCHECK(options == ScriptCompiler::kProduceParserCache ||
options == ScriptCompiler::kProduceCodeCache ||
options == ScriptCompiler::kNoCompileOptions);
// Prepare the data for the internalization phase and compilation phase, which
// will happen in the main thread after parsing.
Zone* zone = new Zone(isolate->allocator(), ZONE_NAME);
ParseInfo* info = new ParseInfo(zone);
info->set_toplevel();
source->zone.reset(zone);
source->info.reset(info);
info->set_isolate(isolate);
info->set_source_stream(source->source_stream.get());
info->set_source_stream_encoding(source->encoding);
info->set_hash_seed(isolate->heap()->HashSeed());
info->set_unicode_cache(&source_->unicode_cache);
info->set_compile_options(options);
info->set_allow_lazy_parsing();
source_->info->set_cached_data(&script_data_);
// Parser needs to stay alive for finalizing the parsing on the main
// thread.
source_->parser.reset(new Parser(source_->info.get()));
source_->parser->DeserializeScopeChain(source_->info.get(),
MaybeHandle<ScopeInfo>());
}
void BackgroundParsingTask::Run() {
DisallowHeapAllocation no_allocation;
DisallowHandleAllocation no_handles;
DisallowHandleDereference no_deref;
// Reset the stack limit of the parser to reflect correctly that we're on a
// background thread.
uintptr_t stack_limit = GetCurrentStackPosition() - stack_size_ * KB;
source_->parser->set_stack_limit(stack_limit);
// Nullify the Isolate temporarily so that the background parser doesn't
// accidentally use it.
Isolate* isolate = source_->info->isolate();
source_->info->set_isolate(nullptr);
source_->parser->ParseOnBackground(source_->info.get());
if (script_data_ != nullptr) {
source_->cached_data.reset(new ScriptCompiler::CachedData(
script_data_->data(), script_data_->length(),
ScriptCompiler::CachedData::BufferOwned));
script_data_->ReleaseDataOwnership();
delete script_data_;
script_data_ = nullptr;
}
source_->info->set_isolate(isolate);
}
} // namespace internal
} // namespace v8
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