1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/background-parsing-task.h"
6
7 namespace v8 {
8 namespace internal {
9
BackgroundParsingTask(StreamedSource * source,ScriptCompiler::CompileOptions options,int stack_size,Isolate * isolate)10 BackgroundParsingTask::BackgroundParsingTask(
11 StreamedSource* source, ScriptCompiler::CompileOptions options,
12 int stack_size, Isolate* isolate)
13 : source_(source), options_(options), stack_size_(stack_size) {
14 // Prepare the data for the internalization phase and compilation phase, which
15 // will happen in the main thread after parsing.
16 source->info.Reset(new i::CompilationInfoWithZone(source->source_stream.get(),
17 source->encoding, isolate));
18 source->info->MarkAsGlobal();
19
20 // We don't set the context to the CompilationInfo yet, because the background
21 // thread cannot do anything with it anyway. We set it just before compilation
22 // on the foreground thread.
23 DCHECK(options == ScriptCompiler::kProduceParserCache ||
24 options == ScriptCompiler::kProduceCodeCache ||
25 options == ScriptCompiler::kNoCompileOptions);
26 source->allow_lazy =
27 !i::Compiler::DebuggerWantsEagerCompilation(source->info.get());
28 source->hash_seed = isolate->heap()->HashSeed();
29 }
30
31
Run()32 void BackgroundParsingTask::Run() {
33 DisallowHeapAllocation no_allocation;
34 DisallowHandleAllocation no_handles;
35 DisallowHandleDereference no_deref;
36
37 ScriptData* script_data = NULL;
38 if (options_ == ScriptCompiler::kProduceParserCache ||
39 options_ == ScriptCompiler::kProduceCodeCache) {
40 source_->info->SetCachedData(&script_data, options_);
41 }
42
43 uintptr_t limit = reinterpret_cast<uintptr_t>(&limit) - stack_size_ * KB;
44 Parser::ParseInfo parse_info = {limit, source_->hash_seed,
45 &source_->unicode_cache};
46
47 // Parser needs to stay alive for finalizing the parsing on the main
48 // thread. Passing &parse_info is OK because Parser doesn't store it.
49 source_->parser.Reset(new Parser(source_->info.get(), &parse_info));
50 source_->parser->set_allow_lazy(source_->allow_lazy);
51 source_->parser->ParseOnBackground();
52
53 if (script_data != NULL) {
54 source_->cached_data.Reset(new ScriptCompiler::CachedData(
55 script_data->data(), script_data->length(),
56 ScriptCompiler::CachedData::BufferOwned));
57 script_data->ReleaseDataOwnership();
58 delete script_data;
59 }
60 }
61 }
62 } // namespace v8::internal
63