Use internal memcpy for CopyWords and when copying code.

src/v8utils.h

 // Copyright 2012 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 93 matching lines @@
 
 
 // Write the C code
 // const char* <varname> = "<str>";
 // const int <varname>_len = <len>;
 // to the file given by filename. Only the first len chars are written.
 int WriteAsCFile(const char* filename, const char* varname,
                  const char* str, int size, bool verbose = true);
 
 
+// ----------------------------------------------------------------------------
 // Data structures
 
 template <typename T>
 inline Vector< Handle<Object> > HandleVector(v8::internal::Handle<T>* elms,
                                              int length) {
   return Vector< Handle<Object> >(
       reinterpret_cast<v8::internal::Handle<Object>*>(elms), length);
 }
 
+
+// ----------------------------------------------------------------------------
 // Memory
 
 // Copies data from |src| to |dst|.  The data spans must not overlap.
 template <typename T>
 inline void CopyWords(T* dst, T* src, int num_words) {
   STATIC_ASSERT(sizeof(T) == kPointerSize);
   ASSERT(Min(dst, src) + num_words <= Max(dst, src));
   ASSERT(num_words > 0);
 
-  // Use block copying memcpy if the segment we're copying is
+  // Use block copying OS::MemCopy if the segment we're copying is
   // enough to justify the extra call/setup overhead.
   static const int kBlockCopyLimit = 16;
+  STATIC_ASSERT(kBlockCopyLimit * kPointerSize >= OS::kMinComplexMemCopy);
 
   if (num_words >= kBlockCopyLimit) {
-    memcpy(dst, src, num_words * kPointerSize);
+    OS::MemCopy(dst, src, num_words * kPointerSize);
   } else {
     int remaining = num_words;
     do {
       remaining--;
       *dst++ = *src++;
     } while (remaining > 0);
   }
 }
 
 
 // Copies data from |src| to |dst|.  The data spans must not overlap.
 template <typename T>
 inline void CopyBytes(T* dst, T* src, int num_bytes) {
   STATIC_ASSERT(sizeof(T) == 1);
   ASSERT(Min(dst, src) + num_bytes <= Max(dst, src));
   ASSERT(num_bytes >= 0);
   if (num_bytes == 0) return;
 
-  // Use block copying memcpy if the segment we're copying is
+  // Use block copying OS::MemCopy if the segment we're copying is
   // enough to justify the extra call/setup overhead.
   static const int kBlockCopyLimit = OS::kMinComplexMemCopy;
 
   if (num_bytes >= kBlockCopyLimit) {
     OS::MemCopy(dst, src, num_bytes);
   } else {
     int remaining = num_bytes;
     do {
       remaining--;
       *dst++ = *src++;
@@ skipping 131 matching lines @@
 
   // Add formatted contents like printf based on a va_list.
   void AddFormattedList(const char* format, va_list list);
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringBuilder);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8UTILS_H_