Fix handling of 'c: if (0) break c; else ()' where a parser optimization

leaves a trailing ";" after removing the break.

Review URL: https://chromiumcodereview.appspot.com/9159043

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10628 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/parser.cc

@@ -2128,6 +2128,7 @@ Statement* Parser::ParseBreakStatement(ZoneStringList* labels, bool* ok) {
   // Parse labeled break statements that target themselves into
   // empty statements, e.g. 'l1: l2: l3: break l2;'
   if (!label.is_null() && ContainsLabel(labels, label)) {
+    ExpectSemicolon(CHECK_OK);
     return EmptyStatement();
   }
   BreakableStatement* target = NULL;

test/mjsunit/regress/regress-1924.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.
+
+// For http://code.google.com/p/v8/issues/detail?id=1924
+
+a: break a;
+a: b: break a;
+a: b: break b;
+assertThrows("a: break a a", SyntaxError)
+assertThrows("a: break a 1", SyntaxError)
+assertThrows("a: break a ''", SyntaxError)
+assertThrows("a: break a var b", SyntaxError)
+assertThrows("a: break a {}", SyntaxError)
+
+a: if (0) break a;
+b: if (0) {break b;} else {}
+c: if (0) break c; else {}
+d: if (0) break d; else break d;