Fix bug that happens when the first non-ASCII character of a literal is at a power-of-two position.

Review URL: http://codereview.chromium.org/6044009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6147 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/scanner-base.h

@@ -214,7 +214,9 @@ class LiteralBuffer {
     ASSERT(is_ascii_);
     Vector<byte> new_store;
     int new_content_size = position_ * kUC16Size;
-    if (new_content_size > backing_store_.length()) {
+    if (new_content_size >= backing_store_.length()) {
+      // Ensure room for all currently read characters as UC16 as well
+      // as the character about to be stored.
       new_store = Vector<byte>::New(NewCapacity(new_content_size));
     } else {
       new_store = backing_store_;

test/mjsunit/regress/regress-1017.js

+// Copyright 2010 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.
+
+// See: http://code.google.com/p/v8/issues/detail?id=1017
+
+// 32 ASCII-characters followed by a non-ASCII character.
+// This causes an internal buffer to first expand to 64 bytes, then expand the
+// 32 ASCII characters to 64 bytes of UC16 characters, leaving no room
+// to store the 33rd character. This fails an ASSERT in debug mode.
+
+assertEquals(33, "12345678901234567890123456789012\u2028".length);
+