Add script streaming API.

src/background-parsing-task.h

Index: src/background-parsing-task.h
diff --git a/src/background-parsing-task.h b/src/background-parsing-task.h
new file mode 100644
index 0000000000000000000000000000000000000000..19c93a833a2cefe5e82af904c25086383ebac038
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+++ b/src/background-parsing-task.h
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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.
+
+#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"
+#include "src/parser.h"
+#include "src/smart-pointers.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.
+struct StreamedSource {
+  StreamedSource(ScriptCompiler::ExternalSourceStream* source_stream,
+                 ScriptCompiler::StreamedSource::Encoding encoding)
+      : source_stream(source_stream),
+        encoding(encoding),
+        hash_seed(0),
+        allow_lazy(false) {}
+
+  // Internal implementation of v8::ScriptCompiler::StreamedSource.
+  SmartPointer<ScriptCompiler::ExternalSourceStream> source_stream;
+  ScriptCompiler::StreamedSource::Encoding encoding;
+  SmartPointer<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;
+  SmartPointer<CompilationInfo> info;
+  uint32_t hash_seed;
+  bool allow_lazy;
+  SmartPointer<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, int stack_size,
+                        Isolate* isolate);
+
+  virtual void Run();
+
+ private:
+  StreamedSource* source_;  // Not owned.
+  ScriptCompiler::CompileOptions options_;
+  int stack_size_;
+};
+}
+}  // namespace v8::internal
+
+#endif  // V8_BACKGROUND_PARSING_TASK_H_