Add script streaming API

src/background-parsing-task.h

+// 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.
+
+#ifndef V8_BACKGROUND_PARSING_TASK_H_
+#define V8_BACKGROUND_PARSING_TASK_H_
+
+#include "src/base/platform/platform.h"
+#include "src/base/platform/semaphore.h"
+#include "src/compiler.h"
+
+namespace v8 {
+namespace internal {
+
+class Parser;
+
+// Data which needs to be transmitted between threads for background parsing,
+// finalizing it on the main thread, and compiling on the main thread. Carried
+// by ScriptSource. (It cannot be carried by BackgroundParsingTask, because
+// BackgroundParsingTask is deleted right after it's ran.)
+class StreamingData {

[jochen (gone - plz use gerrit), 2014/09/08 11:27:06]

if it's just a container, this should be a struct

[marja, 2014/09/08 16:14:47]

Done.

+ public:
+  StreamingData(i::CompilationInfo* i, uint32_t h, UnicodeCache* u, bool a)

[jochen (gone - plz use gerrit), 2014/09/08 11:27:06]

info, hash_seed, etc..

[marja, 2014/09/08 16:14:47]

This code was deleted.

+      : info(i), hash_seed(h), unicode_cache(u), allow_lazy(a), parser(NULL) {}
+
+  ~StreamingData();
+
+  CompilationInfo* info;
+  uint32_t hash_seed;
+  UnicodeCache* unicode_cache;  // Owned.

[jochen (gone - plz use gerrit), 2014/09/08 11:27:06]

how can this be owned, if the data is copied around?

[marja, 2014/09/08 16:14:47]

Prevented copying (which was non-prevented by omission).

+  bool allow_lazy;
+  Parser* parser;  // Owned.
+};
+
+class BackgroundParsingTask : public ScriptCompiler::ScriptStreamingTask {
+ public:
+  explicit BackgroundParsingTask(ScriptCompiler::StreamedSource* source)
+      : source_(source), script_data_(NULL) {}
+
+  virtual void Run();
+
+ private:
+  friend class v8::ScriptCompiler;
+
+  ScriptCompiler::StreamedSource* source_;
+  ScriptData* script_data_;
+};
+}
+}  // namespace v8::internal
+
+#endif  // V8_BACKGROUND_PARSING_TASK_H_