On Mon, Mar 16, 2020 at 06:01:25PM -0400, Jason Merrill wrote:
> > - type = NULL_TREE;
> > - goto out;
> > + error_at (cp_lexer_peek_token (parser->lexer)->location,
> > + "expected %<;%> or %<{%>");
> > + return NULL_TREE;
>
> Hmm, what happens if we commit_to_tentative_parse before the cp_parser_error
> if has_underlying_type? That would also get us a diagnostic in this case
> even in enclosing tentative context.
>
> And yes, I think returning error_mark_node seems appropriate; this is an
> enum-specifier, just an ill-formed one.
Seems to work too. Bootstrapped/regtested on x86_64-linux and i686-linux,
ok for trunk?
2020-03-17 Jakub Jelinek <ja...@redhat.com>
PR c++/90995
* parser.c (cp_parser_enum_specifier): Use temp_override for
parser->colon_corrects_to_scope_p, replace goto out with return.
If scoped enum or enum with underlying type is not followed by
{ or ;, call cp_parser_commit_to_tentative_parse before calling
cp_parser_error and make sure to return error_mark_node instead of
NULL_TREE. Formatting fixes.
* g++.dg/cpp0x/enum40.C: New test.
--- gcc/cp/parser.c.jj 2020-03-14 08:14:47.125740994 +0100
+++ gcc/cp/parser.c 2020-03-17 07:57:19.195642249 +0100
@@ -19001,9 +19001,7 @@ cp_parser_enum_specifier (cp_parser* par
bool is_unnamed = false;
tree underlying_type = NULL_TREE;
cp_token *type_start_token = NULL;
- bool saved_colon_corrects_to_scope_p = parser->colon_corrects_to_scope_p;
-
- parser->colon_corrects_to_scope_p = false;
+ temp_override<bool> cleanup (parser->colon_corrects_to_scope_p, false);
/* Parse tentatively so that we can back up if we don't find a
enum-specifier. */
@@ -19043,24 +19041,24 @@ cp_parser_enum_specifier (cp_parser* par
push_deferring_access_checks (dk_no_check);
nested_name_specifier
- = cp_parser_nested_name_specifier_opt (parser,
- /*typename_keyword_p=*/true,
- /*check_dependency_p=*/false,
- /*type_p=*/false,
- /*is_declaration=*/false);
+ = cp_parser_nested_name_specifier_opt (parser,
+ /*typename_keyword_p=*/true,
+ /*check_dependency_p=*/false,
+ /*type_p=*/false,
+ /*is_declaration=*/false);
if (nested_name_specifier)
{
tree name;
identifier = cp_parser_identifier (parser);
- name = cp_parser_lookup_name (parser, identifier,
- enum_type,
- /*is_template=*/false,
- /*is_namespace=*/false,
- /*check_dependency=*/true,
- /*ambiguous_decls=*/NULL,
- input_location);
+ name = cp_parser_lookup_name (parser, identifier,
+ enum_type,
+ /*is_template=*/false,
+ /*is_namespace=*/false,
+ /*check_dependency=*/true,
+ /*ambiguous_decls=*/NULL,
+ input_location);
if (name && name != error_mark_node)
{
type = TREE_TYPE (name);
@@ -19140,23 +19138,21 @@ cp_parser_enum_specifier (cp_parser* par
{
if (cxx_dialect < cxx11 || (!scoped_enum_p && !underlying_type))
{
+ if (has_underlying_type)
+ cp_parser_commit_to_tentative_parse (parser);
cp_parser_error (parser, "expected %<{%>");
if (has_underlying_type)
- {
- type = NULL_TREE;
- goto out;
- }
+ return error_mark_node;
}
/* An opaque-enum-specifier must have a ';' here. */
if ((scoped_enum_p || underlying_type)
&& cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON))
{
+ if (has_underlying_type)
+ cp_parser_commit_to_tentative_parse (parser);
cp_parser_error (parser, "expected %<;%> or %<{%>");
if (has_underlying_type)
- {
- type = NULL_TREE;
- goto out;
- }
+ return error_mark_node;
}
}
@@ -19172,9 +19168,7 @@ cp_parser_enum_specifier (cp_parser* par
push_scope (nested_name_specifier);
}
else if (TREE_CODE (nested_name_specifier) == NAMESPACE_DECL)
- {
- push_nested_namespace (nested_name_specifier);
- }
+ push_nested_namespace (nested_name_specifier);
}
/* Issue an error message if type-definitions are forbidden here. */
@@ -19334,12 +19328,8 @@ cp_parser_enum_specifier (cp_parser* par
pop_scope (nested_name_specifier);
}
else if (TREE_CODE (nested_name_specifier) == NAMESPACE_DECL)
- {
- pop_nested_namespace (nested_name_specifier);
- }
+ pop_nested_namespace (nested_name_specifier);
}
- out:
- parser->colon_corrects_to_scope_p = saved_colon_corrects_to_scope_p;
return type;
}
--- gcc/testsuite/g++.dg/cpp0x/enum40.C.jj 2020-03-15 22:35:43.413297557
+0100
+++ gcc/testsuite/g++.dg/cpp0x/enum40.C 2020-03-15 22:35:43.413297557 +0100
@@ -0,0 +1,26 @@
+// PR c++/90995
+// { dg-do compile { target c++11 } }
+
+void
+foo ()
+{
+ enum : int a alignas; // { dg-error "expected" }
+}
+
+void
+bar ()
+{
+ enum : int a; // { dg-error "expected" }
+}
+
+void
+baz ()
+{
+ enum class a : int b alignas; // { dg-error "expected" }
+}
+
+void
+qux ()
+{
+ enum class a : int b; // { dg-error "expected" }
+}
Jakub
