re PR c++/10603 (failing to print problematic token upon parse error)

PR c++/10603
	PR c++/12827
	* parser.c (cp_parser_error): Help c_parse_error print good
	messages if the next token is a keyword.
	(cp_parser_parameter_declaration_list): When resynchronizing after
	a bad parameter declaration, stop if a comma is found.
	(cp_parser_parameter_declaration): Avoid backtracking.

	PR c++/10603
	* g++.dg/parse/error6.C: New test.

	PR c++/12827
	* g++.dg/parse/error7.C: New test.

From-SVN: r74743

gcc/cp/ChangeLog

@@ -1,3 +1,13 @@
+2003-12-17  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/10603
+	PR c++/12827
+	* parser.c (cp_parser_error): Help c_parse_error print good
+	messages if the next token is a keyword.
+	(cp_parser_parameter_declaration_list): When resynchronizing after
+	a bad parameter declaration, stop if a comma is found.
+	(cp_parser_parameter_declaration): Avoid backtracking.
+
 2003-12-16  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/12696

gcc/cp/parser.c

@@ -1771,7 +1771,12 @@ cp_parser_error (cp_parser* parser, const char* message)
     {
       cp_token *token;
       token = cp_lexer_peek_token (parser->lexer);
-      c_parse_error (message, token->type, token->value);
+      c_parse_error (message, 
+		     /* Because c_parser_error does not understand
+			CPP_KEYWORD, keywords are treated like
+			identifiers.  */
+		     (token->type == CPP_KEYWORD ? CPP_NAME : token->type), 
+		     token->value);
     }
 }
 
@@ -10804,7 +10809,7 @@ cp_parser_parameter_declaration_list (cp_parser* parser)
 	      || cp_parser_committed_to_tentative_parse (parser))
 	    cp_parser_skip_to_closing_parenthesis (parser, 
 						   /*recovering=*/true,
-						   /*or_comma=*/true,
+						   /*or_comma=*/false,
 						   /*consume_paren=*/false);
 	  break;
 	}
@@ -10900,6 +10905,16 @@ cp_parser_parameter_declaration (cp_parser *parser,
       bool saved_default_arg_ok_p = parser->default_arg_ok_p;
       parser->default_arg_ok_p = false;
   
+      /* After seeing a decl-specifier-seq, if the next token is not a
+	 "(", there is no possibility that the code is a valid
+	 expression initializer.  Therefore, if parsing tentatively,
+	 we commit at this point.  */
+      if (!parser->in_template_argument_list_p
+	  && cp_parser_parsing_tentatively (parser)
+	  && !cp_parser_committed_to_tentative_parse (parser)
+	  && cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_PAREN))
+	cp_parser_commit_to_tentative_parse (parser);
+      /* Parse the declarator.  */
       declarator = cp_parser_declarator (parser,
 					 CP_PARSER_DECLARATOR_EITHER,
 					 /*ctor_dtor_or_conv_p=*/NULL,

gcc/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2003-12-17  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/10603
+	* g++.dg/parse/error6.C: New test.
+
+	PR c++/12827
+	* g++.dg/parse/error7.C: New test.
+
 2003-12-17  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
 	* lib/gcc-dg.exp (gcc-dg-debug-runtest): Do not run debug-[12].c

gcc/testsuite/g++.dg/parse/error3.C

@@ -3,4 +3,4 @@
 static void InstantiateConstraint(const float&, unsigned,
                                   void(*AddFunction)(const TYPE&,bool&, // { dg-error "" }
                                                      char*, char*,
-                                                     unsigned*));
+                                                     unsigned*)); // { dg-error "" }

gcc/testsuite/g++.dg/parse/error6.C

@@ -0,0 +1,6 @@
+// PR c++/10603
+
+int f(int not) { // { dg-error "!" }
+  return 1-not; // { dg-error "" }
+} 
+

gcc/testsuite/g++.dg/parse/error7.C

@@ -0,0 +1,4 @@
+// PR c++/12827
+
+void f(int x
+       int y); // { dg-error "," }