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|
; RUN: opt -S -objc-arc < %s | FileCheck %s
declare i8* @objc_retain(i8*) nonlazybind
declare void @objc_release(i8*) nonlazybind
declare i8* @objc_retainBlock(i8*)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Use by an instruction which copies the value is an escape if the ;
; result is an escape. The current instructions with this property are: ;
; ;
; 1. BitCast. ;
; 2. GEP. ;
; 3. PhiNode. ;
; 4. SelectInst. ;
; ;
; Make sure that such instructions do not confuse the optimizer into removing ;
; an objc_retainBlock that is needed. ;
; ;
; rdar://13273675. (With extra test cases to handle bitcast, phi, and select. ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
define void @bitcasttest(i8* %storage, void (...)* %block) {
; CHECK: define void @bitcasttest
entry:
%t1 = bitcast void (...)* %block to i8*
; CHECK-NOT: tail call i8* @objc_retain
%t2 = tail call i8* @objc_retain(i8* %t1)
; CHECK: tail call i8* @objc_retainBlock
%t3 = tail call i8* @objc_retainBlock(i8* %t1), !clang.arc.copy_on_escape !0
%t4 = bitcast i8* %storage to void (...)**
%t5 = bitcast i8* %t3 to void (...)*
store void (...)* %t5, void (...)** %t4, align 8
; CHECK-NOT: call void @objc_release
call void @objc_release(i8* %t1)
ret void
}
define void @geptest(void (...)** %storage_array, void (...)* %block) {
; CHECK: define void @geptest
entry:
%t1 = bitcast void (...)* %block to i8*
; CHECK-NOT: tail call i8* @objc_retain
%t2 = tail call i8* @objc_retain(i8* %t1)
; CHECK: tail call i8* @objc_retainBlock
%t3 = tail call i8* @objc_retainBlock(i8* %t1), !clang.arc.copy_on_escape !0
%t4 = bitcast i8* %t3 to void (...)*
%storage = getelementptr inbounds void (...)** %storage_array, i64 0
store void (...)* %t4, void (...)** %storage, align 8
; CHECK-NOT: call void @objc_release
call void @objc_release(i8* %t1)
ret void
}
define void @selecttest(void (...)** %store1, void (...)** %store2,
void (...)* %block) {
; CHECK: define void @selecttest
entry:
%t1 = bitcast void (...)* %block to i8*
; CHECK-NOT: tail call i8* @objc_retain
%t2 = tail call i8* @objc_retain(i8* %t1)
; CHECK: tail call i8* @objc_retainBlock
%t3 = tail call i8* @objc_retainBlock(i8* %t1), !clang.arc.copy_on_escape !0
%t4 = bitcast i8* %t3 to void (...)*
%store = select i1 undef, void (...)** %store1, void (...)** %store2
store void (...)* %t4, void (...)** %store, align 8
; CHECK-NOT: call void @objc_release
call void @objc_release(i8* %t1)
ret void
}
define void @phinodetest(void (...)** %storage1,
void (...)** %storage2,
void (...)* %block) {
; CHECK: define void @phinodetest
entry:
%t1 = bitcast void (...)* %block to i8*
; CHECK-NOT: tail call i8* @objc_retain
%t2 = tail call i8* @objc_retain(i8* %t1)
; CHECK: tail call i8* @objc_retainBlock
%t3 = tail call i8* @objc_retainBlock(i8* %t1), !clang.arc.copy_on_escape !0
%t4 = bitcast i8* %t3 to void (...)*
br i1 undef, label %store1_set, label %store2_set
store1_set:
br label %end
store2_set:
br label %end
end:
%storage = phi void (...)** [ %storage1, %store1_set ], [ %storage2, %store2_set]
store void (...)* %t4, void (...)** %storage, align 8
; CHECK-NOT: call void @objc_release
call void @objc_release(i8* %t1)
ret void
}
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; This test makes sure that we do not hang clang when visiting a use ;
; cycle caused by phi nodes during objc-arc analysis. *NOTE* This ;
; test case looks a little convoluted since it was produced by ;
; bugpoint. ;
; ;
; bugzilla://14551 ;
; rdar://12851911 ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
define void @phinode_use_cycle(i8* %block) uwtable optsize ssp {
; CHECK: define void @phinode_use_cycle(i8* %block)
entry:
br label %for.body
for.body: ; preds = %if.then, %for.body, %entry
%block.05 = phi void (...)* [ null, %entry ], [ %1, %if.then ], [ %block.05, %for.body ]
br i1 undef, label %for.body, label %if.then
if.then: ; preds = %for.body
%0 = call i8* @objc_retainBlock(i8* %block), !clang.arc.copy_on_escape !0
%1 = bitcast i8* %0 to void (...)*
%2 = bitcast void (...)* %block.05 to i8*
call void @objc_release(i8* %2) nounwind, !clang.imprecise_release !0
br label %for.body
}
!0 = metadata !{}
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