Sync parser and preparser on do-while and return statements.

src/parser.cc

 // Copyright 2011 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
@@ skipping 2140 matching lines @@
 
 Statement* Parser::ParseReturnStatement(bool* ok) {
   // ReturnStatement ::
   //   'return' Expression? ';'
 
   // Consume the return token. It is necessary to do the before
   // reporting any errors on it, because of the way errors are
   // reported (underlining).
   Expect(Token::RETURN, CHECK_OK);
 
+  Token::Value tok = peek();
+  Statement* result;
+  if (scanner().HasAnyLineTerminatorBeforeNext() ||
+      tok == Token::SEMICOLON ||
+      tok == Token::RBRACE ||
+      tok == Token::EOS) {
+    ExpectSemicolon(CHECK_OK);
+    result = new(zone()) ReturnStatement(GetLiteralUndefined());
+  } else {
+    Expression* expr = ParseExpression(true, CHECK_OK);
+    ExpectSemicolon(CHECK_OK);
+    result = new(zone()) ReturnStatement(expr);
+  }
+
   // An ECMAScript program is considered syntactically incorrect if it
   // contains a return statement that is not within the body of a
   // function. See ECMA-262, section 12.9, page 67.
   //
   // To be consistent with KJS we report the syntax error at runtime.
   Scope* declaration_scope = top_scope_->DeclarationScope();
   if (declaration_scope->is_global_scope() ||
       declaration_scope->is_eval_scope()) {
     Handle<String> type = isolate()->factory()->illegal_return_symbol();
     Expression* throw_error = NewThrowSyntaxError(type, Handle<Object>::null());
     return new(zone()) ExpressionStatement(throw_error);
   }
-
-  Token::Value tok = peek();
-  if (scanner().HasAnyLineTerminatorBeforeNext() ||
-      tok == Token::SEMICOLON ||
-      tok == Token::RBRACE ||
-      tok == Token::EOS) {
-    ExpectSemicolon(CHECK_OK);
-    return new(zone()) ReturnStatement(GetLiteralUndefined());
-  }
-
-  Expression* expr = ParseExpression(true, CHECK_OK);
-  ExpectSemicolon(CHECK_OK);
-  return new(zone()) ReturnStatement(expr);
+  return result;
 }
 
 
 Statement* Parser::ParseWithStatement(ZoneStringList* labels, bool* ok) {
   // WithStatement ::
   //   'with' '(' Expression ')' Statement
 
   Expect(Token::WITH, CHECK_OK);
 
   if (!top_scope_->is_classic_mode()) {
@@ skipping 3479 matching lines @@
       ASSERT(info->isolate()->has_pending_exception());
     } else {
       result = parser.ParseProgram(info);
     }
   }
   info->SetFunction(result);
   return (result != NULL);
 }
 
 } }  // namespace v8::internal