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;
+
+// Internal representation of v8::ScriptCompiler::StreamedSource. Contains all
+// data which needs to be transmitted between threads for background parsing,
+// finalizing it on the main thread, and compiling on the main thread. All
+// pointers are owned.
+struct StreamedSource {
+  StreamedSource(ScriptCompiler::ExternalSourceStream* source_stream,
+                 ScriptCompiler::StreamedSource::Encoding encoding)
+      : source_stream(source_stream),
+        encoding(encoding),
+        cached_data(NULL),
+        info(NULL),
+        hash_seed(0),
+        allow_lazy(false),
+        parser(NULL) {}
+
+  ~StreamedSource();
+
+  // Internal implementation of v8::ScriptCompiler::StreamedSource.
+  ScriptCompiler::ExternalSourceStream* source_stream;
+  ScriptCompiler::StreamedSource::Encoding encoding;
+  ScriptCompiler::CachedData* cached_data;
+
+  // Data needed for parsing, and data needed to to be passed between thread
+  // between parsing and compilation. These need to be initialized before the
+  // compilation starts.
+  UnicodeCache unicode_cache;
+  CompilationInfo* info;

[jochen (gone - plz use gerrit), 2014/09/09 08:06:20]

nit. you could use SmartPointer<CompilationInfo> so you don't need to delete all
owned fields in the dtor (you won't need one at all)

[marja, 2014/09/09 11:46:30]

Done.

+  uint32_t hash_seed;
+  bool allow_lazy;
+  Parser* parser;
+
+ private:
+  // Prevent copying. Not implemented.
+  StreamedSource(const StreamedSource&);
+  StreamedSource& operator=(const StreamedSource&);
+};
+
+
+class BackgroundParsingTask : public ScriptCompiler::ScriptStreamingTask {
+ public:
+  BackgroundParsingTask(StreamedSource* source,
+                        ScriptCompiler::CompileOptions options,
+                        Isolate* isolate);
+
+  virtual void Run();
+
+ private:
+  StreamedSource* source_;
+  ScriptCompiler::CompileOptions options_;
+};
+}
+}  // namespace v8::internal
+
+#endif  // V8_BACKGROUND_PARSING_TASK_H_