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diff test/Transforms/ObjCARC/cfg-hazards.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children 60c9769439b8
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/Transforms/ObjCARC/cfg-hazards.ll	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,435 @@
+; RUN: opt -S -objc-arc < %s | FileCheck %s
+; rdar://9503416
+
+; Detect loop boundaries and don't move retains and releases
+; across them.
+
+declare void @use_pointer(i8*)
+declare i8* @objc_retain(i8*)
+declare void @objc_release(i8*)
+declare void @callee()
+declare void @block_callee(void ()*)
+
+; CHECK-LABEL: define void @test0(
+; CHECK:   call i8* @objc_retain(
+; CHECK: for.body:
+; CHECK-NOT: @objc
+; CHECK: for.end:
+; CHECK:   call void @objc_release(
+; CHECK: }
+define void @test0(i8* %digits) {
+entry:
+  %tmp1 = call i8* @objc_retain(i8* %digits) nounwind
+  call void @use_pointer(i8* %digits)
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %upcDigitIndex.01 = phi i64 [ 2, %entry ], [ %inc, %for.body ]
+  call void @use_pointer(i8* %digits)
+  %inc = add i64 %upcDigitIndex.01, 1
+  %cmp = icmp ult i64 %inc, 12
+  br i1 %cmp, label %for.body, label %for.end
+
+for.end:                                          ; preds = %for.body
+  call void @objc_release(i8* %digits) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+; CHECK-LABEL: define void @test1(
+; CHECK:   call i8* @objc_retain(
+; CHECK: for.body:
+; CHECK-NOT: @objc
+; CHECK: for.end:
+; CHECK:   void @objc_release(
+; CHECK: }
+define void @test1(i8* %digits) {
+entry:
+  %tmp1 = call i8* @objc_retain(i8* %digits) nounwind
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %upcDigitIndex.01 = phi i64 [ 2, %entry ], [ %inc, %for.body ]
+  call void @use_pointer(i8* %digits)
+  call void @use_pointer(i8* %digits)
+  %inc = add i64 %upcDigitIndex.01, 1
+  %cmp = icmp ult i64 %inc, 12
+  br i1 %cmp, label %for.body, label %for.end
+
+for.end:                                          ; preds = %for.body
+  call void @objc_release(i8* %digits) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+; CHECK-LABEL: define void @test2(
+; CHECK:   call i8* @objc_retain(
+; CHECK: for.body:
+; CHECK-NOT: @objc
+; CHECK: for.end:
+; CHECK:   void @objc_release(
+; CHECK: }
+define void @test2(i8* %digits) {
+entry:
+  %tmp1 = call i8* @objc_retain(i8* %digits) nounwind
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %upcDigitIndex.01 = phi i64 [ 2, %entry ], [ %inc, %for.body ]
+  call void @use_pointer(i8* %digits)
+  %inc = add i64 %upcDigitIndex.01, 1
+  %cmp = icmp ult i64 %inc, 12
+  br i1 %cmp, label %for.body, label %for.end
+
+for.end:                                          ; preds = %for.body
+  call void @use_pointer(i8* %digits)
+  call void @objc_release(i8* %digits) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+; Delete nested retain+release pairs around loops.
+
+;      CHECK: define void @test3(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   tail call i8* @objc_retain(i8* %a) [[NUW:#[0-9]+]]
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   call void @objc_release(i8* %a)
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test3(i8* %a) nounwind {
+entry:
+  %outer = call i8* @objc_retain(i8* %a) nounwind
+  %inner = call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  call void @callee()
+  store i8 0, i8* %a
+  br i1 undef, label %loop, label %exit
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test4(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   call void @objc_release(i8* %a)
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test4(i8* %a) nounwind {
+entry:
+  %outer = call i8* @objc_retain(i8* %a) nounwind
+  %inner = call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  br label %more
+
+more:
+  call void @callee()
+  call void @callee()
+  store i8 0, i8* %a
+  br i1 undef, label %loop, label %exit
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test5(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK-NEXT:   call void @callee()
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   call void @use_pointer(i8* %a)
+; CHECK-NEXT:   call void @objc_release(i8* %a)
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test5(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  call void @callee()
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  br label %more
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @use_pointer(i8* %a)
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test6(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   call void @use_pointer(i8* %a)
+; CHECK-NEXT:   call void @objc_release(i8* %a)
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test6(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  call void @callee()
+  br label %more
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @use_pointer(i8* %a)
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test7(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK-NEXT:   call void @callee()
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   call void @objc_release(i8* %a)
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test7(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  call void @callee()
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  call void @use_pointer(i8* %a)
+  br label %more
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test8(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   call void @objc_release(i8* %a)
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test8(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  call void @callee()
+  call void @use_pointer(i8* %a)
+  br label %more
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test9(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test9(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  call void @use_pointer(i8* %a)
+  br label %more
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test10(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test10(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  call void @callee()
+  br label %more
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+;      CHECK: define void @test11(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test11(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  br label %more
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+; Don't delete anything if they're not balanced.
+
+;      CHECK: define void @test12(i8* %a) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   %outer = tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK-NEXT:   %inner = tail call i8* @objc_retain(i8* %a) [[NUW]]
+; CHECK-NEXT:   br label %loop
+;  CHECK-NOT:   @objc_
+;      CHECK: exit:
+; CHECK-NEXT: call void @objc_release(i8* %a) [[NUW]]
+; CHECK-NEXT: call void @objc_release(i8* %a) [[NUW]], !clang.imprecise_release !0
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+define void @test12(i8* %a) nounwind {
+entry:
+  %outer = tail call i8* @objc_retain(i8* %a) nounwind
+  %inner = tail call i8* @objc_retain(i8* %a) nounwind
+  br label %loop
+
+loop:
+  br i1 undef, label %true, label %more
+
+true:
+  ret void
+
+more:
+  br i1 undef, label %exit, label %loop
+
+exit:
+  call void @objc_release(i8* %a) nounwind
+  call void @objc_release(i8* %a) nounwind, !clang.imprecise_release !0
+  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 !{}