Fix for issue 349: Make initial boundary check for BM text search.

There was a case where the BMH algorithm bailed out exactly at the end of the string, and the BM algorithm that takes over wasn't expecting this.

Review URL: http://codereview.chromium.org/113575


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1995 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -2035,7 +2035,7 @@ static int BoyerMooreIndexOf(Vector<const schar> subject,
   BoyerMoorePopulateGoodSuffixTable(pattern, start);
   pchar last_char = pattern[m - 1];
   // Continue search from i.
-  do {
+  while (idx <= n - m) {
     int j = m - 1;
     schar c;
     while (last_char != (c = subject[idx + j])) {
@@ -2061,7 +2061,7 @@ static int BoyerMooreIndexOf(Vector<const schar> subject,
       }
       idx += shift;
     }
-  } while (idx <= n - m);
+  }
 
   return -1;
 }

test/mjsunit/regress/regress-349.js

+// Copyright 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.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Should not crash.
+// See http://code.google.com/p/v8/issues/detail?id=349
+
+var str = "bbaabbbbbbbbabbaaaabbaaabbbaaaabbaaabbabaaabb";
+assertEquals(str, str.replace(/aabab/g, "foo"));