Implement rethrow statement

runtime/vm/parser.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
@@ skipping 6393 matching lines @@
     statement = ParseJump(label_name);
     AddNodeForFinallyInlining(statement);
     ExpectSemicolon();
   } else if (CurrentToken() == Token::kCONTINUE) {
     statement = ParseJump(label_name);
     AddNodeForFinallyInlining(statement);
     ExpectSemicolon();
   } else if (CurrentToken() == Token::kSEMICOLON) {
     // Empty statement, nothing to do.
     ConsumeToken();
-  } else if ((CurrentToken() == Token::kTHROW) &&
-             (LookaheadToken(1) == Token::kSEMICOLON)) {
+  } else if ((CurrentToken() == Token::kRETHROW) ||
+            ((CurrentToken() == Token::kTHROW) &&
+             (LookaheadToken(1) == Token::kSEMICOLON))) {
     // Rethrow of current exception. Throwing of an exception object
     // is an expression and is handled in ParseExpr().
+    // TODO(hausner): remove support for 'throw;'.
     ConsumeToken();
     ExpectSemicolon();
     // Check if it is ok to do a rethrow.
     SourceLabel* label = current_block_->scope->LookupInnermostCatchLabel();
     if (label == NULL ||
         label->FunctionLevel() != current_block_->scope->function_level()) {
       ErrorMsg(statement_pos, "rethrow of an exception is not valid here");
     }
     ASSERT(label->owner() != NULL);
     LocalScope* scope = label->owner()->parent();
@@ skipping 3490 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart