From a90bd3ea6d1ba27b15476f0a768d7952c6723420 Mon Sep 17 00:00:00 2001 From: Nathaniel Shead Date: Tue, 8 Aug 2023 12:48:43 +1000 Subject: [PATCH] c++: Report invalid id-expression in decltype [PR100482] This patch ensures that any errors raised by finish_id_expression when parsing a decltype expression are properly reported, rather than potentially going ignored and causing invalid code to be accepted. We can also now remove the separate check for templates without args as this is also checked for in finish_id_expression. PR c++/100482 gcc/cp/ChangeLog: * parser.cc (cp_parser_decltype_expr): Report errors raised by finish_id_expression. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/decltype-100482.C: New test. Signed-off-by: Nathaniel Shead --- gcc/cp/parser.cc | 22 ++++++++++---------- gcc/testsuite/g++.dg/cpp0x/decltype-100482.C | 12 +++++++++++ 2 files changed, 23 insertions(+), 11 deletions(-) create mode 100644 gcc/testsuite/g++.dg/cpp0x/decltype-100482.C diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc index ba15a095e83e..5b6d03e5a445 100644 --- a/gcc/cp/parser.cc +++ b/gcc/cp/parser.cc @@ -16520,10 +16520,6 @@ cp_parser_decltype_expr (cp_parser *parser, expr = cp_parser_lookup_name_simple (parser, expr, id_expr_start_token->location); - if (expr && TREE_CODE (expr) == TEMPLATE_DECL) - /* A template without args is not a complete id-expression. */ - expr = error_mark_node; - if (expr && expr != error_mark_node && TREE_CODE (expr) != TYPE_DECL @@ -16544,13 +16540,17 @@ cp_parser_decltype_expr (cp_parser *parser, &error_msg, id_expr_start_token->location)); - if (expr == error_mark_node) - /* We found an id-expression, but it was something that we - should not have found. This is an error, not something - we can recover from, so note that we found an - id-expression and we'll recover as gracefully as - possible. */ - id_expression_or_member_access_p = true; + if (error_msg) + { + /* We found an id-expression, but it was something that we + should not have found. This is an error, not something + we can recover from, so report the error we found and + we'll recover as gracefully as possible. */ + cp_parser_parse_definitely (parser); + cp_parser_error (parser, error_msg); + id_expression_or_member_access_p = true; + return error_mark_node; + } } if (expr diff --git a/gcc/testsuite/g++.dg/cpp0x/decltype-100482.C b/gcc/testsuite/g++.dg/cpp0x/decltype-100482.C new file mode 100644 index 000000000000..1df8b1627437 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/decltype-100482.C @@ -0,0 +1,12 @@ +// PR c++/100482 +// { dg-do compile { target c++11 } } + +namespace N {} +decltype(N) x; // { dg-error "expected primary-expression" } + +struct S {}; +decltype(S) y; // { dg-error "argument to .decltype. must be an expression" } + +template +struct U {}; +decltype(U) z; // { dg-error "missing template arguments" } -- 2.47.2