Revision: 7263
Author: [email protected]
Date: Fri Mar 18 06:40:48 2011
Log: Make Script.prototype.nameOrSourceURL use indexOf search first
before trying to match with a RegExp.
This should use Boyer-Moore search with a long string, which is potentially
faster than RegExp search.
The target string is typically, but not guaranteed, at the end of the
source, so for long sources, there will be a lot of characters to skip.
Review URL: http://codereview.chromium.org/6709027
http://code.google.com/p/v8/source/detail?r=7263
Modified:
/branches/bleeding_edge/src/messages.js
=======================================
--- /branches/bleeding_edge/src/messages.js Thu Mar 17 13:28:41 2011
+++ /branches/bleeding_edge/src/messages.js Fri Mar 18 06:40:48 2011
@@ -495,10 +495,24 @@
// because this file is being processed by js2c whose handling of spaces
// in regexps is broken. Also, ['"] are excluded from allowed URLs to
// avoid matches against sources that invoke evals with sourceURL.
- var sourceUrlPattern =
- /\/\/@[\040\t]sourceURL=[\040\t]*([^\s'"]*)[\040\t]*$/m;
- var match = sourceUrlPattern.exec(this.source);
- return match ? match[1] : this.name;
+ // A better solution would be to detect these special comments in
+ // the scanner/parser.
+ var source = ToString(this.source);
+ var sourceUrlPos = %StringIndexOf(source, "sourceURL=", 0);
+ if (sourceUrlPos > 4) {
+ var sourceUrlPattern =
+ /\/\/@[\040\t]sourceURL=[\040\t]*([^\s\'\"]*)[\040\t]*$/gm;
+ // Don't reuse lastMatchInfo here, so we create a new array with room
+ // for four captures (array with length one longer than the index
+ // of the fourth capture, where the numbering is zero-based).
+ var matchInfo = new InternalArray(CAPTURE(3) + 1);
+ var match =
+ %_RegExpExec(sourceUrlPattern, source, sourceUrlPos - 4,
matchInfo);
+ if (match) {
+ return SubString(source, matchInfo[CAPTURE(2)],
matchInfo[CAPTURE(3)]);
+ }
+ }
+ return this.name;
}
--
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