Fix wrong indexing in global regexp.

R=ulan@chromium.org
BUG=142087

Review URL: https://chromiumcodereview.appspot.com/10824278

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12300 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/jsregexp.cc

@@ -753,7 +753,7 @@ RegExpImpl::GlobalCache::GlobalCache(Handle<JSRegExp> regexp,
   ASSERT(registers_per_match_ >= 2);  // Each match has at least one capture.
   ASSERT_GE(register_array_size_, registers_per_match_);
   int32_t* last_match =
-      &register_array_[register_array_size_ - registers_per_match_];
+      &register_array_[(current_match_index_ - 1) * registers_per_match_];
   last_match[0] = -1;
   last_match[1] = 0;
 }
@@ -779,7 +779,7 @@ int32_t* RegExpImpl::GlobalCache::FetchNext() {
     }
 
     int32_t* last_match =
-        &register_array_[register_array_size_ - registers_per_match_];
+        &register_array_[(current_match_index_ - 1) * registers_per_match_];
     int last_end_index = last_match[1];
 
     if (regexp_->TypeTag() == JSRegExp::ATOM) {

test/mjsunit/regress/regress-crbug-142087.js

+// Copyright 2012 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.
+
+var string = "What are you looking for?";
+
+var expected_match = [];
+for (var i = 0; i < string.length; i++) {
+  expected_match.push("");
+}
+
+string.replace(/(_)|(_|)/g, "");
+assertArrayEquals(expected_match, string.match(/(_)|(_|)/g, ""));
+
+'***************************************'.match(/((\\)|(\*)|(\$))/g, ".");