[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
diff --git a/clang/test/CodeGenObjC/nontrivial-c-struct-func-name-collision.m b/clang/test/CodeGenObjC/nontrivial-c-struct-func-name-collision.m
new file mode 100644
index 0000000..bf512ec
--- /dev/null
+++ b/clang/test/CodeGenObjC/nontrivial-c-struct-func-name-collision.m
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -triple arm64-apple-ios11 -fobjc-arc -fblocks -fobjc-runtime=ios-11.0 -emit-llvm -verify -o - %s
+
+typedef struct { // expected-error {{special function __default_constructor_8_s8 for non-trivial C struct has incorrect type}}
+ int i;
+ id f1;
+} StrongSmall;
+
+int __default_constructor_8_s8(double a) {
+ return 0;
+}
+
+void testIncorrectFunctionType(void) {
+ StrongSmall x;
+}