parser.c (cp_parser_compound_literal_p): New.

2014-06-27  Paolo Carlini  <paolo.carlini@oracle.com>

	* parser.c (cp_parser_compound_literal_p): New.
	(cp_parser_postfix_expression, cp_parser_sizeof_operand): Use it.

From-SVN: r212064

gcc/cp/ChangeLog

@@ -1,3 +1,8 @@
+2014-06-27  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* parser.c (cp_parser_compound_literal_p): New.
+	(cp_parser_postfix_expression, cp_parser_sizeof_operand): Use it.
+
 2014-06-26  Jason Merrill  <jason@redhat.com>
 
 	* parser.c (cp_parser_for_init_statement): Change range-for error

gcc/cp/parser.c

@@ -2480,7 +2480,9 @@ static bool cp_parser_is_keyword
 static tree cp_parser_make_typename_type
   (cp_parser *, tree, tree, location_t location);
 static cp_declarator * cp_parser_make_indirect_declarator
- (enum tree_code, tree, cp_cv_quals, cp_declarator *, tree);
+  (enum tree_code, tree, cp_cv_quals, cp_declarator *, tree);
+static bool cp_parser_compound_literal_p
+  (cp_parser *);
 
 /* Returns nonzero if we are parsing tentatively.  */
 
@@ -5609,6 +5611,30 @@ cp_parser_qualifying_entity (cp_parser *parser,
   return scope;
 }
 
+/* Return true if we are looking at a compound-literal, false otherwise.  */
+
+static bool
+cp_parser_compound_literal_p (cp_parser *parser)
+{
+  /* Consume the `('.  */
+  cp_lexer_consume_token (parser->lexer);
+
+  cp_lexer_save_tokens (parser->lexer);
+
+  /* Skip tokens until the next token is a closing parenthesis.
+     If we find the closing `)', and the next token is a `{', then
+     we are looking at a compound-literal.  */
+  bool compound_literal_p
+    = (cp_parser_skip_to_closing_parenthesis (parser, false, false,
+					      /*consume_paren=*/true)
+       && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE));
+  
+  /* Roll back the tokens we skipped.  */
+  cp_lexer_rollback_tokens (parser->lexer);
+
+  return compound_literal_p;
+}
+
 /* Parse a postfix-expression.
 
    postfix-expression:
@@ -5917,25 +5943,12 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p,
 	    && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN))
 	  {
 	    tree initializer = NULL_TREE;
-	    bool compound_literal_p;
 
 	    cp_parser_parse_tentatively (parser);
-	    /* Consume the `('.  */
-	    cp_lexer_consume_token (parser->lexer);
 
 	    /* Avoid calling cp_parser_type_id pointlessly, see comment
 	       in cp_parser_cast_expression about c++/29234.  */
-	    cp_lexer_save_tokens (parser->lexer);
+	    if (!cp_parser_compound_literal_p (parser))
-
-	    compound_literal_p
-	      = (cp_parser_skip_to_closing_parenthesis (parser, false, false,
-							/*consume_paren=*/true)
-		 && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE));
-
-	    /* Roll back the tokens we skipped.  */
-	    cp_lexer_rollback_tokens (parser->lexer);
-
-	    if (!compound_literal_p)
 	      cp_parser_simulate_error (parser);
 	    else
 	      {
@@ -23966,31 +23979,15 @@ cp_parser_sizeof_operand (cp_parser* parser, enum rid keyword)
   if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN))
     {
       tree type = NULL_TREE;
-      bool compound_literal_p;
 
       /* We can't be sure yet whether we're looking at a type-id or an
 	 expression.  */
       cp_parser_parse_tentatively (parser);
-      /* Consume the `('.  */
-      cp_lexer_consume_token (parser->lexer);
       /* Note: as a GNU Extension, compound literals are considered
 	 postfix-expressions as they are in C99, so they are valid
 	 arguments to sizeof.  See comment in cp_parser_cast_expression
 	 for details.  */
-      cp_lexer_save_tokens (parser->lexer);
+      if (cp_parser_compound_literal_p (parser))
-      /* Skip tokens until the next token is a closing parenthesis.
-	 If we find the closing `)', and the next token is a `{', then
-	 we are looking at a compound-literal.  */
-      compound_literal_p
-	= (cp_parser_skip_to_closing_parenthesis (parser, false, false,
-						  /*consume_paren=*/true)
-	   && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE));
-      /* Roll back the tokens we skipped.  */
-      cp_lexer_rollback_tokens (parser->lexer);
-      /* If we were looking at a compound-literal, simulate an error
-	 so that the call to cp_parser_parse_definitely below will
-	 fail.  */
-      if (compound_literal_p)
 	cp_parser_simulate_error (parser);
       else
 	{