public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc(refs/vendors/ARM/heads/morello)] c: Use convert to handle transparent unions
@ 2022-05-06 14:44 Matthew Malcomson
0 siblings, 0 replies; only message in thread
From: Matthew Malcomson @ 2022-05-06 14:44 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:edec423371d1b35241b51a8d340e6fc772c76315
commit edec423371d1b35241b51a8d340e6fc772c76315
Author: Richard Sandiford <richard.sandiford@arm.com>
Date: Wed Apr 27 16:27:47 2022 +0100
c: Use convert to handle transparent unions
Transparent unions allow things such as:
typedef union U { int *__capability a; }
__attribute__((transparent_union)) U;
void f(U);
void g(int *ptr) { f(ptr); }
where ptr implicitly converts to the union. However, the handling
of this case used fold_convert_loc to convert ptr to a's type,
which bypassed all our usual logic for converting non-capability
pointers to capability pointers.
Diff:
---
gcc/c/c-typeck.c | 2 +-
gcc/testsuite/gcc.target/aarch64/morello/transparent-union-1.c | 5 +++++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index a40d5eb21c4..b6b59687151 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -7171,7 +7171,7 @@ convert_for_assignment (location_t location, location_t expr_loc, tree type,
pedwarn (location, OPT_Wpedantic,
"ISO C prohibits argument conversion to union type");
- rhs = fold_convert_loc (location, TREE_TYPE (memb), rhs);
+ rhs = convert (TREE_TYPE (memb), rhs);
return build_constructor_single (type, memb, rhs);
}
}
diff --git a/gcc/testsuite/gcc.target/aarch64/morello/transparent-union-1.c b/gcc/testsuite/gcc.target/aarch64/morello/transparent-union-1.c
new file mode 100644
index 00000000000..e96ffa7f40f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/morello/transparent-union-1.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+
+typedef union U { int *__capability a; } __attribute__((transparent_union)) U;
+void f(U);
+void g(int *ptr) { f(ptr); }
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-05-06 14:44 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-05-06 14:44 [gcc(refs/vendors/ARM/heads/morello)] c: Use convert to handle transparent unions Matthew Malcomson
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).