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Fix the objc_autoreleasedReturnValue optimization code to locate

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the call correctly even in the case where it is an invoke. This
fixes rdar://11714057.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159157 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2012-06-25 19:47:37 +00:00
parent a4e6397fd9
commit 58fb3401fa
2 changed files with 48 additions and 6 deletions
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19
lib/Transforms/Scalar/ObjCARC.cpp
View File

@ -4064,8 +4064,22 @@ bool ObjCARCContract::runOnFunction(Function &F) {
if (!RetainRVMarker)
break;
BasicBlock::iterator BBI = Inst;
--BBI;
while (isNoopInstruction(BBI)) --BBI;
BasicBlock *InstParent = Inst->getParent();
// Step up to see if the call immediately precedes the RetainRV call.
// If it's an invoke, we have to cross a block boundary. And we have
// to carefully dodge no-op instructions.
do {
if (&*BBI == InstParent->begin()) {
BasicBlock *Pred = InstParent->getSinglePredecessor();
if (!Pred)
goto decline_rv_optimization;
BBI = Pred->getTerminator();
break;
}
--BBI;
} while (isNoopInstruction(BBI));
if (&*BBI == GetObjCArg(Inst)) {
Changed = true;
InlineAsm *IA =
@ -4075,6 +4089,7 @@ bool ObjCARCContract::runOnFunction(Function &F) {
/*Constraints=*/"", /*hasSideEffects=*/true);
CallInst::Create(IA, "", Inst);
}
decline_rv_optimization:
break;
}
case IC_InitWeak: {

35
test/Transforms/ObjCARC/contract-testcases.ll
View File

@ -4,17 +4,17 @@
%0 = type opaque
%1 = type opaque
%2 = type { i64, i64 }
%3 = type { i8*, i8* }
%4 = type opaque
declare %0* @"\01-[NSAttributedString(Terminal) pathAtIndex:effectiveRange:]"(%1*, i8* nocapture, i64, %2*) optsize
declare i8* @objc_retainAutoreleasedReturnValue(i8*)
declare i8* @objc_msgSend_fixup(i8*, %3*, ...)
declare i8* @objc_msgSend_fixup(i8*, i8*, ...)
declare i8* @objc_msgSend(i8*, i8*, ...)
declare void @objc_release(i8*)
declare %2 @NSUnionRange(i64, i64, i64, i64) optsize
declare i8* @objc_autoreleaseReturnValue(i8*)
declare i8* @objc_autorelease(i8*)
declare i8* @objc_msgSend() nonlazybind
declare i32 @__gxx_personality_sj0(...)
; Don't get in trouble on bugpointed code.
@ -52,7 +52,7 @@ bb6: ; preds = %bb5, %bb4, %bb4, %b
; CHECK: %tmp8 = phi %0* [ %0, %bb ], [ %0, %bb ]
define void @test1() {
bb:
%tmp = tail call %0* bitcast (i8* ()* @objc_msgSend to %0* ()*)()
%tmp = tail call %0* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to %0* ()*)()
%tmp2 = bitcast %0* %tmp to i8*
%tmp3 = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %tmp2) nounwind
br i1 undef, label %bb7, label %bb7
@ -61,3 +61,30 @@ bb7: ; preds = %bb6, %bb6, %bb5
%tmp8 = phi %0* [ %tmp, %bb ], [ %tmp, %bb ]
unreachable
}
; When looking for the defining instruction for an objc_retainAutoreleasedReturnValue
; call, handle the case where it's an invoke in a different basic block.
; rdar://11714057
; CHECK: define void @_Z6doTestP8NSString() {
; CHECK: invoke.cont: ; preds = %entry
; CHECK-NEXT: call void asm sideeffect "mov\09r7, r7\09\09@ marker for objc_retainAutoreleaseReturnValue", ""()
; CHECK-NEXT: %tmp = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %call) nounwind
define void @_Z6doTestP8NSString() {
entry:
%call = invoke i8* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i8* ()*)()
to label %invoke.cont unwind label %lpad
invoke.cont: ; preds = %entry
%tmp = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %call) nounwind
unreachable
lpad: ; preds = %entry
%tmp1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
cleanup
resume { i8*, i32 } undef
}
!clang.arc.retainAutoreleasedReturnValueMarker = !{!0}
!0 = metadata !{metadata !"mov\09r7, r7\09\09@ marker for objc_retainAutoreleaseReturnValue"}