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| author | Jason Merrill <jason@redhat.com> | 2018-10-03 11:56:29 -0400 |
|---|---|---|
| committer | Jason Merrill <jason@gcc.gnu.org> | 2018-10-03 11:56:29 -0400 |
| commit | bedf03a298f87b43f02eaee57542fbd10228ec08 (patch) | |
| tree | b89298bfa67ef964fcefa62e3d8b27bfd7807c1d /gcc/c-family/c-lex.c | |
| parent | 749c0e1d8b2c8dbc54af3365af506b3e1986e754 (diff) | |
| download | gcc-bedf03a298f87b43f02eaee57542fbd10228ec08.zip gcc-bedf03a298f87b43f02eaee57542fbd10228ec08.tar.gz gcc-bedf03a298f87b43f02eaee57542fbd10228ec08.tar.bz2 | |
Implement P0840, language support for empty objects.
The [[no_unique_address]] attribute on a non-static data member
enables the equivalent of the empty base optimization.
gcc/cp/
* tree.c (handle_no_unique_addr_attribute): New.
(cxx_attribute_table): Add [[no_unique_address]].
* class.c (field_poverlapping_p): New.
(layout_class_type): Check it. Adjust DECL_SIZE of potentially
overlapping fields.
(layout_empty_base_or_field): Rename from layout_empty_base, handle
FIELD_DECL as well.
(build_base_field, record_subobject_offsets): Adjust.
c-family/
* c-lex.c (c_common_has_attribute): Add no_unique_address.
From-SVN: r264813
Diffstat (limited to 'gcc/c-family/c-lex.c')
| -rw-r--r-- | gcc/c-family/c-lex.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/c-family/c-lex.c b/gcc/c-family/c-lex.c index ac58335c..78a1324 100644 --- a/gcc/c-family/c-lex.c +++ b/gcc/c-family/c-lex.c @@ -356,6 +356,8 @@ c_common_has_attribute (cpp_reader *pfile) || is_attribute_p ("nodiscard", attr_name) || is_attribute_p ("fallthrough", attr_name)) result = 201603; + else if (is_attribute_p ("no_unique_address", attr_name)) + result = 20180312; if (result) attr_name = NULL_TREE; } |