De-virtualize snapshot sink.

src/snapshot-source-sink.h

 // Copyright 2012 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_SNAPSHOT_SOURCE_SINK_H_
 #define V8_SNAPSHOT_SOURCE_SINK_H_
 
 #include "src/base/logging.h"
 #include "src/utils.h"
 
@@ skipping 52 matching lines @@
 };
 
 
 /**
  * Sink to write snapshot files to.
  *
  * Subclasses must implement actual storage or i/o.
  */
 class SnapshotByteSink {
  public:
-  virtual ~SnapshotByteSink() { }
-  virtual void Put(byte b, const char* description) = 0;
-  virtual void PutSection(int b, const char* description) {
+  SnapshotByteSink() {}
+  explicit SnapshotByteSink(int initial_size) : data_(initial_size) {}
+
+  ~SnapshotByteSink() {}
+
+  void Put(byte b, const char* description) { data_.Add(b); }
+
+  void PutSection(int b, const char* description) {
     DCHECK_LE(b, kMaxUInt8);
     Put(static_cast<byte>(b), description);
   }
+
   void PutInt(uintptr_t integer, const char* description);
   void PutRaw(byte* data, int number_of_bytes, const char* description);
   void PutBlob(byte* data, int number_of_bytes, const char* description);
-  virtual int Position() = 0;
-};
+  int Position() { return data_.length(); }
 
-
-class DummySnapshotSink : public SnapshotByteSink {
- public:
-  DummySnapshotSink() : length_(0) {}
-  virtual ~DummySnapshotSink() {}
-  virtual void Put(byte b, const char* description) { length_++; }
-  virtual int Position() { return length_; }
+  const List<byte>& data() const { return data_; }
 
  private:
-  int length_;
-};
-
-
-// Wrap a SnapshotByteSink into a DebugSnapshotSink to get debugging output.
-class DebugSnapshotSink : public SnapshotByteSink {
- public:
-  explicit DebugSnapshotSink(SnapshotByteSink* chained) : sink_(chained) {}
-  virtual void Put(byte b, const char* description) OVERRIDE;
-  virtual int Position() OVERRIDE { return sink_->Position(); }
-
- private:
-  SnapshotByteSink* sink_;
-};
-
-
-class ListSnapshotSink : public i::SnapshotByteSink {
- public:
-  explicit ListSnapshotSink(i::List<byte>* data) : data_(data) {}
-  virtual void Put(byte b, const char* description) OVERRIDE {
-    data_->Add(b);
-  }
-  virtual int Position() OVERRIDE { return data_->length(); }
-
- private:
-  i::List<byte>* data_;
+  List<byte> data_;
 };
 
 }  // namespace v8::internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SOURCE_SINK_H_