Two-threaded parser

src/scanner-character-streams.h

Index: src/scanner-character-streams.h
diff --git a/src/scanner-character-streams.h b/src/scanner-character-streams.h
index 0d02f0201965923a7c19b1ff7d8bb8eefefa7d10..3b30fd438fbc9aba7fd2f941afac963cddb74e53 100644
--- a/src/scanner-character-streams.h
+++ b/src/scanner-character-streams.h
@@ -73,10 +73,11 @@ class Utf8ToUtf16CharacterStream: public BufferedUtf16CharacterStream {
 };
 
 
-// UTF16 buffer to read characters from an external string.
+// UTF16 buffer to read characters from an external two byte (UTF-16)
+// string. The caller is responsible for keeping the memory alive.
 class ExternalTwoByteStringUtf16CharacterStream: public Utf16CharacterStream {
  public:
-  ExternalTwoByteStringUtf16CharacterStream(Handle<ExternalTwoByteString> data,
+  ExternalTwoByteStringUtf16CharacterStream(const uint16_t* raw_data,
                                             int start_position,
                                             int end_position);
   virtual ~ExternalTwoByteStringUtf16CharacterStream();
@@ -96,10 +97,29 @@ class ExternalTwoByteStringUtf16CharacterStream: public Utf16CharacterStream {
     // Entire string is read at start.
     return false;
   }
-  Handle<ExternalTwoByteString> source_;
   const uc16* raw_data_;  // Pointer to the actual array of characters.
 };
 
+
+// UTF16 buffer to read characters from an external one byte (latin1)
+// string. Note that "ascii" in ExternalAsciiString is actually latin1. The
+// caller is responsible for keeping the memory alive.
+class ExternalOneByteStringUtf16CharacterStream
+    : public BufferedUtf16CharacterStream {
+ public:
+  ExternalOneByteStringUtf16CharacterStream(const uint8_t* raw_data,
+                                            int start_position,
+                                            int end_position);
+  virtual ~ExternalOneByteStringUtf16CharacterStream();
+
+ protected:
+  virtual unsigned BufferSeekForward(unsigned delta);
+  virtual unsigned FillBuffer(unsigned position, unsigned length);
+
+  const uint8_t* raw_data_;  // Pointer to the actual array of characters.
+  unsigned length_;
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_CHARACTER_STREAMS_H_