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instruction can decrement the reference count, not whether it can alter it This prevents the state transition from S_Use to S_CanRelease when doing a bottom-up traversal and the transition from S_Retain to S_CanRelease when doing a top-down traversal when the visited instruction can increment the ref count but cannot decrement it. This allows the ARC optimizer to remove retain/release pairs which were previously not removed. rdar://problem/21793154
59 lines
2.0 KiB
LLVM
59 lines
2.0 KiB
LLVM
; RUN: opt -S -objc-arc < %s | FileCheck %s
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i686--windows-msvc"
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declare i8* @f(i8*, i8*)
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declare i32 @__CxxFrameHandler3(...)
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declare dllimport i8* @llvm.objc.autoreleaseReturnValue(i8* returned)
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declare dllimport i8* @llvm.objc.retain(i8* returned)
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declare dllimport i8* @llvm.objc.retainAutoreleasedReturnValue(i8* returned)
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declare dllimport void @llvm.objc.release(i8*)
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define i8* @g(i8* %p, i8* %q) local_unnamed_addr personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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%0 = tail call i8* @llvm.objc.retain(i8* %p) #0
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; the following call prevents ARC optimizer from removing the retain/release
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; pair on %p
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%v1 = call i8* @f(i8* null, i8* null)
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%1 = tail call i8* @llvm.objc.retain(i8* %q) #0
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%call = invoke i8* @f(i8* %p, i8* %q)
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to label %invoke.cont unwind label %catch.dispatch, !clang.arc.no_objc_arc_exceptions !0
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catch.dispatch:
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%2 = catchswitch within none [label %catch] unwind to caller
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catch:
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%3 = catchpad within %2 [i8* null, i32 64, i8* null]
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catchret from %3 to label %cleanup
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invoke.cont:
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%4 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %call) #0
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br label %cleanup
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cleanup:
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%retval.0 = phi i8* [ %call, %invoke.cont ], [ null, %catch ]
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tail call void @llvm.objc.release(i8* %q) #0, !clang.imprecise_release !0
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tail call void @llvm.objc.release(i8* %p) #0, !clang.imprecise_release !0
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%5 = tail call i8* @llvm.objc.autoreleaseReturnValue(i8* %retval.0) #0
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ret i8* %retval.0
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}
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; CHECK-LABEL: entry:
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; CHECK-NEXT: %0 = tail call i8* @llvm.objc.retain(i8* %p) #0
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; CHECK-NEXT: call i8* @f(i8* null, i8* null)
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; CHECK-NEXT: %call = invoke i8* @f(i8* %p, i8* %q)
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; CHECK-NEXT: to label %invoke.cont unwind label %catch.dispatch
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; CHECK-LABEL: catch.dispatch:
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; CHECK-NEXT: %1 = catchswitch within none [label %catch] unwind to caller
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; CHECK-LABEL: cleanup:
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; CHECK: tail call void @llvm.objc.release(i8* %p) #0
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attributes #0 = { nounwind }
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!0 = !{}
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