Avoids allocating a JSArray of capture information on each non-global...

src/macros.py

-# Copyright 2006-2008 the V8 project authors. All rights reserved.
+# Copyright 2006-2009 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
 #       with the distribution.
@@ skipping 80 matching lines @@
 macro NUMBER_IS_NAN(arg) = (!%_IsSmi(%IS_VAR(arg)) && !(arg == arg));
 macro TO_INTEGER(arg)    = (%_IsSmi(%IS_VAR(arg)) ? arg : ToInteger(arg));
 macro TO_INT32(arg)      = (%_IsSmi(%IS_VAR(arg)) ? arg : ToInt32(arg));
 
 # Macros implemented in Python.
 python macro CHAR_CODE(str) = ord(str[1]);
 
 # Accessors for original global properties that ensure they have been loaded.
 const ORIGINAL_REGEXP = (global.RegExp, $RegExp);
 const ORIGINAL_DATE   = (global.Date, $Date);
+
+# Constants used on an array to implement the properties of the RegExp object.
+const REGEXP_NUMBER_OF_CAPTURES = 0;
+const REGEXP_FIRST_CAPTURE = 1;
+
+# We can't put macros in macros so we use constants here.
+# REGEXP_NUMBER_OF_CAPTURES
+macro NUMBER_OF_CAPTURES(array) = ((array)[0]);
+
+# Last input and last subject are after the captures so we can omit them on
+# results returned from global searches.
+macro LAST_SUBJECT(array) = ((array)[(array)[0] + 1]);

[Christian Plesner Hansen, 2009/02/26 15:18:53]

Beware: this evaluates its argument twice.

+macro LAST_INPUT(array) = ((array)[(array)[0] + 2]);
+
+# REGEXP_FIRST_CAPTURE
+macro CAPTURE(index) = (1 + (index));
+const CAPTURE0 = 1;
+const CAPTURE1 = 2;