It turns out that clang does use pointer-to-function types to

point to ARC-managed pointers sometimes. This fixes rdar://10551239.

llvm-svn: 146577

2 files changed, 34 insertions, 1 deletions

diff --git a/llvm/test/Transforms/ObjCARC/basic.ll b/llvm/test/Transforms/ObjCARC/basic.ll
index c466fa0e254..44c2602e575 100644
--- a/llvm/test/Transforms/ObjCARC/basic.ll
+++ b/llvm/test/Transforms/ObjCARC/basic.ll
@@ -1528,9 +1528,11 @@ define void @test52(i8** %zz, i8** %pp) {
 
 ; Like test52, but the pointer has function type, so it's assumed to
 ; be not reference counted.
+; Oops. That's wrong. Clang sometimes uses function types gratuitously.
+; See rdar://10551239.
 
 ; CHECK: define void @test53(
-; CHECK-NOT: @objc_
+; CHECK: @objc_
 ; CHECK: }
 define void @test53(void ()** %zz, i8** %pp) {
   %p = load i8** %pp
diff --git a/llvm/test/Transforms/ObjCARC/pointer-types.ll b/llvm/test/Transforms/ObjCARC/pointer-types.ll
new file mode 100644
index 00000000000..6abc9398643
--- /dev/null
+++ b/llvm/test/Transforms/ObjCARC/pointer-types.ll
@@ -0,0 +1,31 @@
+; RUN: opt -objc-arc -S < %s | FileCheck %s
+
+; Don't hoist @objc_release past a use of its pointer, even
+; if the use has function type, because clang uses function types
+; in dubious ways.
+; rdar://10551239
+
+; CHECK: define void @test0(
+; CHECK: %otherBlock = phi void ()* [ %b1, %if.then ], [ null, %entry ]
+; CHECK-NEXT: call void @use_fptr(void ()* %otherBlock)
+; CHECK-NEXT: %tmp11 = bitcast void ()* %otherBlock to i8*
+; CHECK-NEXT: call void @objc_release(i8* %tmp11)
+
+define void @test0(i1 %tobool, void ()* %b1) {
+entry:
+  br i1 %tobool, label %if.end, label %if.then
+
+if.then:                                          ; preds = %entry
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  %otherBlock = phi void ()* [ %b1, %if.then ], [ null, %entry ]
+  call void @use_fptr(void ()* %otherBlock)
+  %tmp11 = bitcast void ()* %otherBlock to i8*
+  call void @objc_release(i8* %tmp11) nounwind
+  ret void
+}
+
+declare void @use_fptr(void ()*)
+declare void @objc_release(i8*)
+