fix embedded vector copy constructor and assignment.

src/utils.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 361 matching lines @@
   }
 
   inline Vector<T> operator+(int offset) {
     ASSERT(offset < length_);
     return Vector<T>(start_ + offset, length_ - offset);
   }
 
   // Factory method for creating empty vectors.
   static Vector<T> empty() { return Vector<T>(NULL, 0); }
 
+ protected:
+  void set_start(T* start) { start_ = start; }
+
  private:
   T* start_;
   int length_;
 };
 
 
 // A temporary assignment sets a (non-local) variable to a value on
 // construction and resets it the value on destruction.
 template <typename T>
 class TempAssign {
  public:
   TempAssign(T* var, T value): var_(var), old_value_(*var) {
     *var = value;
   }
 
   ~TempAssign() { *var_ = old_value_; }
 
  private:
   T* var_;
   T old_value_;
 };
 
 
 template <typename T, int kSize>
 class EmbeddedVector : public Vector<T> {
  public:
   EmbeddedVector() : Vector<T>(buffer_, kSize) { }
+
+  // When copying, make underlying Vector to reference our buffer.
+  EmbeddedVector(const EmbeddedVector& rhs)
+      : Vector<T>(rhs) {
+    memcpy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+    set_start(buffer_);
+  }
+
+  EmbeddedVector& operator=(const EmbeddedVector& rhs) {
+    if (this == &rhs) return *this;
+    Vector<T>::operator=(rhs);
+    memcpy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+    set_start(buffer_);
+    return *this;
+  }
+
  private:
   T buffer_[kSize];
 };
 
 
 template <typename T>
 class ScopedVector : public Vector<T> {
  public:
   explicit ScopedVector(int length) : Vector<T>(NewArray<T>(length), length) { }
   ~ScopedVector() {
@@ skipping 127 matching lines @@
 #endif
   while (dest < limit) {
     *dest++ = static_cast<sinkchar>(*src++);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_