Faster implementation of integer-to-ascii conversion. I think....

src/conversions.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 84 matching lines @@
 
 // Converts a string into an integer.
 int StringToInt(String* str, int index, int radix, double* value);
 int StringToInt(const char* str, int index, int radix, double* value);
 
 // Converts a double to a string value according to ECMA-262 9.8.1.
 // The buffer should be large enough for any floating point number.
 // 100 characters is enough.
 const char* DoubleToCString(double value, Vector<char> buffer);
 
-// Convert an int to a null-terminated string. The returned string is
-// located inside the buffer, but not necessarily at the start.
-const char* IntToCString(int n, Vector<char> buffer);
+// Convert an int to a null-terminated string. The returned string need
+// not be freed by the caller, but may be overwritten by a later call to
+// IntToCString.
+const char* IntToCString(int n, int* length_return);
 
 // Additional number to string conversions for the number type.
 // The caller is responsible for calling free on the returned pointer.
 char* DoubleToFixedCString(double value, int f);
 char* DoubleToExponentialCString(double value, int f);
 char* DoubleToPrecisionCString(double value, int f);
 char* DoubleToRadixCString(double value, int radix);
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONVERSIONS_H_