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4 Commits

Author SHA1 Message Date
Akira Hatanaka d791e92b5f [ObjC] Allow declaring __weak pointer fields in C structs in ARC. 
This patch uses the infrastructure added in r326307 for enabling
non-trivial fields to be declared in C structs to allow __weak fields in
C structs in ARC.

This recommits r327206, which was reverted because it caused
module-enabled builders to fail. I discovered that the
CXXRecordDecl::CanPassInRegisters flag wasn't being set correctly in
some cases after I moved it to RecordDecl.

Thanks to Eric Liu for helping me investigate the bug.

rdar://problem/33599681

https://reviews.llvm.org/D44095

llvm-svn: 327870
 2018-03-19 17:38:40 +00:00
Akira Hatanaka be7daa3d50 Revert "[ObjC] Allow declaring __weak pointer fields in C structs in 
ARC."

This reverts commit r327206 as there were test failures caused by this
patch.

http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20180312/221427.html

llvm-svn: 327294
 2018-03-12 17:05:06 +00:00
Akira Hatanaka c181b127c0 [ObjC] Allow declaring __weak pointer fields in C structs in ARC. 
This patch uses the infrastructure added in r326307 for enabling
non-trivial fields to be declared in C structs to allow __weak fields in
C structs in ARC.

rdar://problem/33599681

Differential Revision: https://reviews.llvm.org/D44095

llvm-svn: 327206
 2018-03-10 06:36:08 +00:00
Akira Hatanaka 7275da0f2e [ObjC] Allow declaring __strong pointer fields in structs in Objective-C 
ARC mode.

Declaring __strong pointer fields in structs was not allowed in
Objective-C ARC until now because that would make the struct non-trivial
to default-initialize, copy/move, and destroy, which is not something C
was designed to do. This patch lifts that restriction.

Special functions for non-trivial C structs are synthesized that are
needed to default-initialize, copy/move, and destroy the structs and
manage the ownership of the objects the __strong pointer fields point
to. Non-trivial structs passed to functions are destructed in the callee
function.

rdar://problem/33599681

Differential Revision: https://reviews.llvm.org/D41228

llvm-svn: 326307
 2018-02-28 07:15:55 +00:00