X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=test%2FTransforms%2FObjCARC%2Fcfg-hazards.ll;h=61e5a3b1dccb9e1a58cc27ffc752e31b7ea347fb;hb=b55dcfe47fbbcfc1dccd07cb27c02b9a86533d05;hp=899298b5967e46c492ab016a840bdcc4719e1f65;hpb=351b7a10e2560a835759748c58da09e53207b39d;p=oota-llvm.git

diff --git a/test/Transforms/ObjCARC/cfg-hazards.ll b/test/Transforms/ObjCARC/cfg-hazards.ll
index 899298b5967..61e5a3b1dcc 100644
--- a/test/Transforms/ObjCARC/cfg-hazards.ll
+++ b/test/Transforms/ObjCARC/cfg-hazards.ll
@@ -8,8 +8,9 @@ declare void @use_pointer(i8*)
 declare i8* @objc_retain(i8*)
 declare void @objc_release(i8*)
 declare void @callee()
+declare void @block_callee(void ()*)
 
-; CHECK: define void @test0(
+; CHECK-LABEL: define void @test0(
 ; CHECK:   call i8* @objc_retain(
 ; CHECK: for.body:
 ; CHECK-NOT: @objc
@@ -34,7 +35,7 @@ for.end:                                          ; preds = %for.body
   ret void
 }
 
-; CHECK: define void @test1(
+; CHECK-LABEL: define void @test1(
 ; CHECK:   call i8* @objc_retain(
 ; CHECK: for.body:
 ; CHECK-NOT: @objc
@@ -59,7 +60,7 @@ for.end:                                          ; preds = %for.body
   ret void
 }
 
-; CHECK: define void @test2(
+; CHECK-LABEL: define void @test2(
 ; CHECK:   call i8* @objc_retain(
 ; CHECK: for.body:
 ; CHECK-NOT: @objc
@@ -394,6 +395,41 @@ exit:
   ret void
 }
 
+; Do not improperly pair retains in a for loop with releases outside of a for
+; loop when the proper pairing is disguised by a separate provenance represented
+; by an alloca.
+; rdar://12969722
+
+; CHECK: define void @test13(i8* %a) [[NUW]] {
+; CHECK: entry:
+; CHECK:   tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK: loop:
+; CHECK:   tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK:   call void @block_callee
+; CHECK:   call void @objc_release(i8* %reloaded_a) [[NUW]]
+; CHECK: exit:
+; CHECK:   call void @objc_release(i8* %a) [[NUW]]
+; CHECK: }
+define void @test13(i8* %a) nounwind {
+entry:
+  %block = alloca i8*
+  %a1 = tail call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  %a2 = tail call i8* @objc_retain(i8* %a) nounwind
+  store i8* %a, i8** %block, align 8
+  %casted_block = bitcast i8** %block to void ()*
+  call void @block_callee(void ()* %casted_block)
+  %reloaded_a = load i8** %block, align 8
+  call void @objc_release(i8* %reloaded_a) nounwind, !clang.imprecise_release !0
+  br i1 undef, label %loop, label %exit
+  
+exit:
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
 ; CHECK: attributes [[NUW]] = { nounwind }
 
 !0 = metadata !{}