gcc/gcc41-pr32121.patch

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2007-10-16 14:18:55 +00:00
2007-10-12 Jakub Jelinek <jakub@redhat.com>
PR c++/32121
* parser.c (cp_parser_compound_statement): Handle label-declarations
at the beginning of the compound statement.
(cp_parser_block_declaration): Issue diagnostics about __label__
not at the beginning of a block.
* g++.dg/ext/label4.C: Adjust error regexp.
* g++.dg/ext/label7.C: New test.
* g++.dg/ext/label8.C: New test.
* g++.dg/ext/label9.C: New test.
--- gcc/cp/parser.c (revision 129252)
+++ gcc/cp/parser.c (revision 129253)
@@ -6821,6 +6821,15 @@ cp_parser_expression_statement (cp_parse
compound-statement:
{ statement-seq [opt] }
+ GNU extension:
+
+ compound-statement:
+ { label-declaration-seq [opt] statement-seq [opt] }
+
+ label-declaration-seq:
+ label-declaration
+ label-declaration-seq label-declaration
+
Returns a tree representing the statement. */
static tree
@@ -6834,6 +6843,9 @@ cp_parser_compound_statement (cp_parser
return error_mark_node;
/* Begin the compound-statement. */
compound_stmt = begin_compound_stmt (in_try ? BCS_TRY_BLOCK : 0);
+ /* If the next keyword is `__label__' we have a label declaration. */
+ while (cp_lexer_next_token_is_keyword (parser->lexer, RID_LABEL))
+ cp_parser_label_declaration (parser);
/* Parse an (optional) statement-seq. */
cp_parser_statement_seq_opt (parser, in_statement_expr);
/* Finish the compound-statement. */
@@ -7711,7 +7723,6 @@ cp_parser_declaration (cp_parser* parser
block-declaration:
__extension__ block-declaration
- label-declaration
C++0x Extension:
@@ -7772,12 +7783,16 @@ cp_parser_block_declaration (cp_parser *
cp_parser_using_declaration (parser,
/*access_declaration_p=*/false);
}
- /* If the next keyword is `__label__' we have a label declaration. */
+ /* If the next keyword is `__label__' we have a misplaced label
+ declaration. */
else if (token1->keyword == RID_LABEL)
{
- if (statement_p)
- cp_parser_commit_to_tentative_parse (parser);
- cp_parser_label_declaration (parser);
+ cp_lexer_consume_token (parser->lexer);
+ error ("%<__label__%> not at the beginning of a block");
+ cp_parser_skip_to_end_of_statement (parser);
+ /* If the next token is now a `;', consume it. */
+ if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON))
+ cp_lexer_consume_token (parser->lexer);
}
/* If the next token is `static_assert' we have a static assertion. */
else if (token1->keyword == RID_STATIC_ASSERT)
--- gcc/testsuite/g++.dg/ext/label9.C (revision 0)
+++ gcc/testsuite/g++.dg/ext/label9.C (revision 129253)
@@ -0,0 +1,10 @@
+// PR c++/32121
+// { dg-do compile }
+
+int f (void)
+{
+ while (1)
+ __label__ a; // { dg-error "not at the beginning" }
+ for (;;)
+ __label__ b; // { dg-error "not at the beginning" }
+}
--- gcc/testsuite/g++.dg/ext/label4.C (revision 129252)
+++ gcc/testsuite/g++.dg/ext/label4.C (revision 129253)
@@ -3,4 +3,4 @@
// { dg-do compile }
-__label__ *l; // { dg-error "before" }
+__label__ *l; // { dg-error "not at the beginning of" }
--- gcc/testsuite/g++.dg/ext/label7.C (revision 0)
+++ gcc/testsuite/g++.dg/ext/label7.C (revision 129253)
@@ -0,0 +1,12 @@
+// PR c++/32121
+// { dg-do compile }
+
+int f (void)
+{
+ a:;
+ __label__ a; // { dg-error "not at the beginning" }
+ int b;
+ __label__ c; // { dg-error "not at the beginning" }
+ a:; // { dg-error "duplicate label" }
+ c:;
+}
--- gcc/testsuite/g++.dg/ext/label8.C (revision 0)
+++ gcc/testsuite/g++.dg/ext/label8.C (revision 129253)
@@ -0,0 +1,22 @@
+// PR c++/32121
+// { dg-do compile }
+
+int f (void)
+{
+ __label__ a, b;
+ __label__ c;
+ a:;
+ b:;
+ c:;
+ {
+ __label__ d;
+ d:;
+ if (0)
+ {
+ __label__ e;
+ __label__ f;
+ f:;
+ e:;
+ }
+ }
+}