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* [gcc r14-9033] c++: Diagnose this specifier on template parameters [PR113929]
@ 2024-02-16 16:43 Jakub Jelinek
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From: Jakub Jelinek @ 2024-02-16 16:43 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:5286b0761b5dfac4348d1c5bfdcc162a66f338ee
commit r14-9033-g5286b0761b5dfac4348d1c5bfdcc162a66f338ee
Author: Jakub Jelinek <jakub@redhat.com>
Date: Fri Feb 16 17:42:32 2024 +0100
c++: Diagnose this specifier on template parameters [PR113929]
For template parameters, the optional this specifier is in the grammar
template-parameter-list -> template-parameter -> parameter-declaration,
just [dcl.fct/6] says that it is only valid in parameter-list of certain
functions. So, unlike the case of decl-specifier-seq used in non-terminals
other than parameter-declaration, I think it is better not to fix this
by
cp_parser_decl_specifier_seq (parser,
- flags | CP_PARSER_FLAGS_PARAMETER,
+ flags | (template_parameter_p ? 0
+ : CP_PARSER_FLAGS_PARAMETER),
&decl_specifiers,
&declares_class_or_enum);
which would be pretending it isn't in the grammar, but by diagnosing it
separately, which is what the following patch does.
2024-02-16 Jakub Jelinek <jakub@redhat.com>
PR c++/113929
* parser.cc (cp_parser_parameter_declaration): Diagnose this specifier
on template parameter declaration.
* g++.dg/parse/pr113929.C: New test.
Diff:
---
gcc/cp/parser.cc | 9 ++++++++-
gcc/testsuite/g++.dg/parse/pr113929.C | 7 +++++++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 9d0914435fb1..b2ed2baa3a57 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -25724,8 +25724,15 @@ cp_parser_parameter_declaration (cp_parser *parser,
for a C-style variadic function. */
token = cp_lexer_peek_token (parser->lexer);
- bool const xobj_param_p
+ bool xobj_param_p
= decl_spec_seq_has_spec_p (&decl_specifiers, ds_this);
+ if (xobj_param_p && template_parm_p)
+ {
+ error_at (decl_specifiers.locations[ds_this],
+ "%<this%> specifier in template parameter declaration");
+ xobj_param_p = false;
+ decl_specifiers.locations[ds_this] = 0;
+ }
if (xobj_param_p
&& ((declarator && declarator->parameter_pack_p)
diff --git a/gcc/testsuite/g++.dg/parse/pr113929.C b/gcc/testsuite/g++.dg/parse/pr113929.C
new file mode 100644
index 000000000000..4410f7bf85a7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/pr113929.C
@@ -0,0 +1,7 @@
+// PR c++/113929
+// { dg-do compile }
+
+template <this int C> // { dg-error "'this' specifier in template parameter declaration" }
+struct S {};
+template <int N, this int C> // { dg-error "'this' specifier in template parameter declaration" }
+struct T {};
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