[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
diff --git a/clang/lib/CodeGen/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index e812ef3..6ece1d3 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -2307,6 +2307,21 @@
"objc_copyWeak");
}
+void CodeGenFunction::emitARCCopyAssignWeak(QualType Ty, Address DstAddr,
+ Address SrcAddr) {
+ llvm::Value *Object = EmitARCLoadWeakRetained(SrcAddr);
+ Object = EmitObjCConsumeObject(Ty, Object);
+ EmitARCStoreWeak(DstAddr, Object, false);
+}
+
+void CodeGenFunction::emitARCMoveAssignWeak(QualType Ty, Address DstAddr,
+ Address SrcAddr) {
+ llvm::Value *Object = EmitARCLoadWeakRetained(SrcAddr);
+ Object = EmitObjCConsumeObject(Ty, Object);
+ EmitARCStoreWeak(DstAddr, Object, false);
+ EmitARCDestroyWeak(SrcAddr);
+}
+
/// Produce the code to do a objc_autoreleasepool_push.
/// call i8* \@objc_autoreleasePoolPush(void)
llvm::Value *CodeGenFunction::EmitObjCAutoreleasePoolPush() {