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| author | Joseph Myers <joseph@codesourcery.com> | 2019-11-15 01:33:37 +0000 |
|---|---|---|
| committer | Joseph Myers <jsm28@gcc.gnu.org> | 2019-11-15 01:33:37 +0000 |
| commit | f8aea5e37d12e09fef68b854a190f71d6b39e11f (patch) | |
| tree | af29d11914c8522b85aaac821765cf424cea24f3 /gcc/c-family/c-common.h | |
| parent | d3cb8f004a3c1ea3de3d948d80f5faabadd1f0b0 (diff) | |
| download | gcc-f8aea5e37d12e09fef68b854a190f71d6b39e11f.zip gcc-f8aea5e37d12e09fef68b854a190f71d6b39e11f.tar.gz gcc-f8aea5e37d12e09fef68b854a190f71d6b39e11f.tar.bz2 | |
Improve checks on C2x fallthrough attribute.
When adding C2x attribute support, some [[fallthrough]] support
appeared as a side-effect because of code for that attribute going
through separate paths from the normal attribute handling.
However, going through those paths without the normal attribute
handlers meant that certain checks, such as for the invalid usage
[[fallthrough()]], did not operate. This patch improves checks by
adding this attribute to the standard attribute table, so that the
parser knows it expects no arguments, along with adding an explicit
check for "[[fallthrough]];" attribute-declarations at top level. As
with other attributes, there are still cases where warnings should be
pedwarns because C2x constraints are violated, but this patch improves
the attribute handling.
Bootstrapped with no regressions on x86_64-pc-linux-gnu.
gcc/c:
* c-decl.c (std_attribute_table): Add fallthrough.
* c-parser.c (c_parser_declaration_or_fndef): Diagnose fallthrough
attribute at top level.
gcc/c-family:
* c-attribs.c (handle_fallthrough_attribute): Remove static.
* c-common.h (handle_fallthrough_attribute): Declare.
gcc/testsuite:
* gcc.dg/c2x-attr-fallthrough-2.c,
gcc.dg/c2x-attr-fallthrough-3.c: New tests.
From-SVN: r278273
Diffstat (limited to 'gcc/c-family/c-common.h')
| -rw-r--r-- | gcc/c-family/c-common.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/c-family/c-common.h b/gcc/c-family/c-common.h index ad40c15..f3478d3 100644 --- a/gcc/c-family/c-common.h +++ b/gcc/c-family/c-common.h @@ -1359,6 +1359,7 @@ extern void warn_for_multistatement_macros (location_t, location_t, extern bool attribute_takes_identifier_p (const_tree); extern tree handle_deprecated_attribute (tree *, tree, tree, int, bool *); extern tree handle_unused_attribute (tree *, tree, tree, int, bool *); +extern tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *); extern int parse_tm_stmt_attr (tree, int); extern int tm_attr_to_mask (tree); extern tree tm_mask_to_attr (int); |