Don't create a Bigint object first for every integer while parsing the sources, instead first check…

vm/os.h

Index: vm/os.h
===================================================================
--- vm/os.h	(revision 9558)
+++ vm/os.h	(working copy)
@@ -82,6 +82,13 @@
                       const char* format,
                       va_list args);
 
+  // Converts a C string to a 64 bit value.
+  // Returns false if it is unable to convert the string to a 64 bit value,
+  // the failure could be because of underflow/overflow or invalid characters.
+  // On success the function returns true and 'value' contains the converted
+  // value.

[sra1, 2012/07/11 21:46:43]

Please document the valid inputs. E.g., one might say that the input must be a
valid Dart integer number literal.

This function has many differences to what you might expect from the name
'Strtoll'.  No leading whitespace. No automatic detection of octal radix.  None
of the implementations correctly detect trailing crap.  '123X' will be converted
to 123, and 'QQ', '' and '-' will be converted to 0.

This is all OK if documented, otherwise the code should work properly for any
input.

[siva, 2012/07/12 18:28:23]

I have renamed it as 'StringToInteger' to avoid any confusion and expectations
of how this function should work.

On 2012/07/11 21:46:43, sra1 wrote:

+  static bool Strtoll(const char* str, int64_t* value);
+
   // Initialize the OS class.
   static void InitOnce();