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| author | Jakub Jelinek <jakub@redhat.com> | 2020-04-22 16:44:42 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2020-04-22 16:44:42 +0200 |
| commit | c3a34659036b55fa36a5355fdd67133f427eeb2d (patch) | |
| tree | 2a42175d9f7f989fa0acc263563ccb13b024e69a | |
| parent | 4e16452e2900fc79b090794e7b7a5727f1136a4a (diff) | |
| download | gcc-c3a34659036b55fa36a5355fdd67133f427eeb2d.zip gcc-c3a34659036b55fa36a5355fdd67133f427eeb2d.tar.gz gcc-c3a34659036b55fa36a5355fdd67133f427eeb2d.tar.bz2 | |
calls: Introduce cxx17_empty_base_field_p [PR94383]
As multiple targets are affected apparently, I believe at least
aarch64, arm, powerpc64le, s390{,x} and ia64,
I think we should have a middle-end predicate for this, so that if we need
to tweak it, we can do it in one spot.
2020-04-22 Jakub Jelinek <jakub@redhat.com>
PR target/94383
* calls.h (cxx17_empty_base_field_p): Declare.
* calls.c (cxx17_empty_base_field_p): Define.
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/calls.c | 18 | ||||
| -rw-r--r-- | gcc/calls.h | 1 |
3 files changed, 25 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 961048a..043ee40 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2020-04-22 Jakub Jelinek <jakub@redhat.com> + + PR target/94383 + * calls.h (cxx17_empty_base_field_p): Declare. + * calls.c (cxx17_empty_base_field_p): Define. + 2020-04-22 Christophe Lyon <christophe.lyon@linaro.org> * doc/sourcebuild.texi (arm_softfp_ok, arm_hard_ok): Document. diff --git a/gcc/calls.c b/gcc/calls.c index 5bd9227..9ac7f94 100644 --- a/gcc/calls.c +++ b/gcc/calls.c @@ -6261,5 +6261,23 @@ must_pass_va_arg_in_stack (tree type) return targetm.calls.must_pass_in_stack (arg); } +/* Return true if FIELD is the C++17 empty base field that should + be ignored for ABI calling convention decisions in order to + maintain ABI compatibility between C++14 and earlier, which doesn't + add this FIELD to classes with empty bases, and C++17 and later + which does. */ + +bool +cxx17_empty_base_field_p (const_tree field) +{ + return (TREE_CODE (field) == FIELD_DECL + && DECL_ARTIFICIAL (field) + && RECORD_OR_UNION_TYPE_P (TREE_TYPE (field)) + && DECL_SIZE (field) + && integer_zerop (DECL_SIZE (field)) + && TYPE_SIZE (TREE_TYPE (field)) + && !integer_zerop (TYPE_SIZE (TREE_TYPE (field)))); +} + /* Tell the garbage collector about GTY markers in this source file. */ #include "gt-calls.h" diff --git a/gcc/calls.h b/gcc/calls.h index 9c9dd96..4ee4936 100644 --- a/gcc/calls.h +++ b/gcc/calls.h @@ -135,5 +135,6 @@ extern tree get_attr_nonstring_decl (tree, tree * = NULL); extern void maybe_warn_nonstring_arg (tree, tree); extern bool get_size_range (tree, tree[2], bool = false); extern rtx rtx_for_static_chain (const_tree, bool); +extern bool cxx17_empty_base_field_p (const_tree); #endif // GCC_CALLS_H |