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[objc-arc] Convert the one directional retain/release relation assert to a conditional check + fail.
Due to the previously added overflow checks, we can have a retain/release relation that is one directional. This occurs specifically when we run into an additive overflow causing us to drop state in only one direction. If that occurs, we should bail and not optimize that retain/release instead of asserting. Apologies for the size of the testcase. It is necessary to cause the additive cfg overflow to trigger. rdar://15377890 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194083 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman
parent
04ae34b0aa
commit
f23af8bfd8
@ -2405,7 +2405,15 @@ ObjCARCOpt::ConnectTDBUTraversals(DenseMap<const BasicBlock *, BBState>
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if (Jt == Releases.end())
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return false;
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const RRInfo &NewRetainReleaseRRI = Jt->second;
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assert(NewRetainReleaseRRI.Calls.count(NewRetain));
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// If the release does not have a reference to the retain as well,
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// something happened which is unaccounted for. Do not do anything.
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//
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// This can happen if we catch an additive overflow during path count
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// merging.
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if (!NewRetainReleaseRRI.Calls.count(NewRetain))
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return false;
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if (ReleasesToMove.Calls.insert(NewRetainRelease)) {
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// If we overflow when we compute the path count, don't remove/move
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@ -2481,9 +2489,16 @@ ObjCARCOpt::ConnectTDBUTraversals(DenseMap<const BasicBlock *, BBState>
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if (Jt == Retains.end())
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return false;
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const RRInfo &NewReleaseRetainRRI = Jt->second;
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assert(NewReleaseRetainRRI.Calls.count(NewRelease));
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if (RetainsToMove.Calls.insert(NewReleaseRetain)) {
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// If the retain does not have a reference to the release as well,
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// something happened which is unaccounted for. Do not do anything.
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//
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// This can happen if we catch an additive overflow during path count
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// merging.
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if (!NewReleaseRetainRRI.Calls.count(NewRelease))
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return false;
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if (RetainsToMove.Calls.insert(NewReleaseRetain)) {
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// If we overflow when we compute the path count, don't remove/move
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// anything.
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const BBState &NRRBBState = BBStates[NewReleaseRetain->getParent()];
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@ -2,6 +2,7 @@
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; rdar://12277446
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; rdar://12480535
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; rdar://14590914
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; rdar://15377890
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; The total number of paths grows exponentially with the number of branches, and a
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; computation of this number can overflow any reasonable fixed-sized
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@ -15,6 +16,7 @@ target triple = "thumbv7-apple-ios5.0.0"
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%struct.CGPoint = type { float, float }
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@_unnamed_cfstring = external constant %struct.NSConstantString, section "__DATA,__cfstring"
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@_unnamed_cfstring_2 = external constant %struct.NSConstantString, section "__DATA,__cfstring"
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declare i8* @objc_retain(i8*) nonlazybind
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declare i8* @objc_retainAutoreleasedReturnValue(i8*) nonlazybind
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@ -24,6 +26,7 @@ declare i8* @objc_msgSend(i8*, i8*, ...) nonlazybind
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declare void @NSLog(i8*, ...)
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declare void @objc_msgSend_stret(i8*, i8*, ...)
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declare i32 @__gxx_personality_sj0(...)
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declare i32 @__objc_personality_v0(...)
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define hidden void @test1() {
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@ -1914,4 +1917,277 @@ eh.resume: ; preds = %lpad580, %ehcleanup
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resume { i8*, i32 } undef
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}
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@"OBJC_EHTYPE_$_NSException" = external global i8
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define void @test4() {
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entry:
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br i1 undef, label %if.end13, label %if.then10
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if.then10: ; preds = %entry
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br label %if.end13
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if.end13: ; preds = %if.then10, %entry
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%0 = call i8* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i8* (i8*, i8*, i8*, i64, i8*, i8)*)(i8* undef, i8* undef, i8* bitcast (%struct.NSConstantString* @_unnamed_cfstring to i8*), i64 2, i8* bitcast (%struct.NSConstantString* @_unnamed_cfstring_2 to i8*), i8 signext 0), !clang.arc.no_objc_arc_exceptions !0
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br i1 undef, label %if.then17, label %if.end18
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if.then17: ; preds = %if.end13
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br label %if.end18
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if.end18: ; preds = %if.then17, %if.end13
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br i1 undef, label %if.then64, label %if.end73
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if.then64: ; preds = %if.end18
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br i1 undef, label %cond.end71, label %cond.true68
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cond.true68: ; preds = %if.then64
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br label %cond.end71
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cond.end71: ; preds = %cond.true68, %if.then64
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br i1 undef, label %cleanup.action, label %cleanup.done
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cleanup.action: ; preds = %cond.end71
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br label %cleanup.done
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cleanup.done: ; preds = %cleanup.action, %cond.end71
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br label %if.end73
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if.end73: ; preds = %cleanup.done, %if.end18
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br i1 undef, label %forcoll.empty, label %forcoll.loopinit
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forcoll.loopinit: ; preds = %if.end73
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br label %forcoll.loopbody.outer
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forcoll.loopbody.outer: ; preds = %forcoll.refetch, %forcoll.loopinit
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br label %forcoll.loopbody
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forcoll.loopbody: ; preds = %forcoll.notmutated, %forcoll.loopbody.outer
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br i1 undef, label %forcoll.notmutated, label %forcoll.mutated
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forcoll.mutated: ; preds = %forcoll.loopbody
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br label %forcoll.notmutated
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forcoll.notmutated: ; preds = %forcoll.mutated, %forcoll.loopbody
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br i1 undef, label %forcoll.loopbody, label %forcoll.refetch
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forcoll.refetch: ; preds = %forcoll.notmutated
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br i1 undef, label %forcoll.empty, label %forcoll.loopbody.outer
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forcoll.empty: ; preds = %forcoll.refetch, %if.end73
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br i1 undef, label %if.end85, label %if.then82
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if.then82: ; preds = %forcoll.empty
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br label %if.end85
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if.end85: ; preds = %if.then82, %forcoll.empty
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br i1 undef, label %if.then87, label %if.end102
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if.then87: ; preds = %if.end85
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br i1 undef, label %if.end94, label %if.then91
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if.then91: ; preds = %if.then87
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br label %if.end94
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if.end94: ; preds = %if.then91, %if.then87
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br i1 undef, label %if.end101, label %if.then98
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if.then98: ; preds = %if.end94
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br label %if.end101
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if.end101: ; preds = %if.then98, %if.end94
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br label %if.end102
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if.end102: ; preds = %if.end101, %if.end85
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br i1 undef, label %do.body113, label %if.then107
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if.then107: ; preds = %if.end102
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br label %do.body113
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do.body113: ; preds = %if.then107, %if.end102
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br i1 undef, label %if.then116, label %if.end117
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if.then116: ; preds = %do.body113
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br label %if.end117
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if.end117: ; preds = %if.then116, %do.body113
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br i1 undef, label %if.then125, label %if.end126
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if.then125: ; preds = %if.end117
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br label %if.end126
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if.end126: ; preds = %if.then125, %if.end117
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br i1 undef, label %do.end166, label %cond.true132
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cond.true132: ; preds = %if.end126
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br i1 undef, label %do.body148, label %cond.true151
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do.body148: ; preds = %cond.true132
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br i1 undef, label %do.end166, label %cond.true151
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cond.true151: ; preds = %do.body148, %cond.true132
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br i1 undef, label %if.then162, label %do.end166
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if.then162: ; preds = %cond.true151
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br label %do.end166
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do.end166: ; preds = %if.then162, %cond.true151, %do.body148, %if.end126
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br i1 undef, label %if.then304, label %if.then170
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if.then170: ; preds = %do.end166
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br i1 undef, label %do.end193, label %cond.true179
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cond.true179: ; preds = %if.then170
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br i1 undef, label %if.then190, label %do.end193
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if.then190: ; preds = %cond.true179
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br label %do.end193
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do.end193: ; preds = %if.then190, %cond.true179, %if.then170
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br i1 undef, label %do.body200, label %do.body283
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do.body200: ; preds = %do.end193
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br i1 undef, label %do.end254, label %cond.true203
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cond.true203: ; preds = %do.body200
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br i1 undef, label %do.body218, label %cond.true221
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do.body218: ; preds = %cond.true203
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br i1 undef, label %do.end254, label %cond.true221
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cond.true221: ; preds = %do.body218, %cond.true203
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br i1 undef, label %if.then232, label %do.body236
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if.then232: ; preds = %cond.true221
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br label %do.body236
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do.body236: ; preds = %if.then232, %cond.true221
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br i1 undef, label %do.end254, label %cond.true239
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cond.true239: ; preds = %do.body236
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br i1 undef, label %if.then250, label %do.end254
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if.then250: ; preds = %cond.true239
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br label %do.end254
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do.end254: ; preds = %if.then250, %cond.true239, %do.body236, %do.body218, %do.body200
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br i1 undef, label %do.end277, label %cond.true263
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cond.true263: ; preds = %do.end254
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br i1 undef, label %if.then274, label %do.end277
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if.then274: ; preds = %cond.true263
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unreachable
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do.end277: ; preds = %cond.true263, %do.end254
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br i1 undef, label %if.then280, label %do.body283
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if.then280: ; preds = %do.end277
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br label %do.body283
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do.body283: ; preds = %if.then280, %do.end277, %do.end193
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br i1 undef, label %if.end301, label %cond.true286
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cond.true286: ; preds = %do.body283
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br i1 undef, label %if.then297, label %if.end301
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if.then297: ; preds = %cond.true286
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br label %if.end301
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if.end301: ; preds = %if.then297, %cond.true286, %do.body283
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br i1 undef, label %if.then304, label %do.body351
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if.then304: ; preds = %if.end301, %do.end166
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br i1 undef, label %do.body309.lr.ph, label %do.body351
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do.body309.lr.ph: ; preds = %if.then304
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br label %do.body309
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do.body309: ; preds = %for.cond.backedge, %do.body309.lr.ph
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br i1 undef, label %do.end328, label %cond.true312
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cond.true312: ; preds = %do.body309
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br i1 undef, label %if.then323, label %do.end328
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if.then323: ; preds = %cond.true312
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br label %do.end328
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do.end328: ; preds = %if.then323, %cond.true312, %do.body309
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br i1 undef, label %for.cond.backedge, label %cond.true335
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for.cond.backedge: ; preds = %if.then346, %cond.true335, %do.end328
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br i1 undef, label %do.body309, label %do.body351
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cond.true335: ; preds = %do.end328
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br i1 undef, label %if.then346, label %for.cond.backedge
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if.then346: ; preds = %cond.true335
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br label %for.cond.backedge
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do.body351: ; preds = %for.cond.backedge, %if.then304, %if.end301
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br i1 undef, label %if.then354, label %if.end355
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if.then354: ; preds = %do.body351
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br label %if.end355
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if.end355: ; preds = %if.then354, %do.body351
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br i1 undef, label %if.else, label %if.then364
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if.then364: ; preds = %if.end355
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br label %do.body366
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if.else: ; preds = %if.end355
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br label %do.body366
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do.body366: ; preds = %if.else, %if.then364
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br i1 undef, label %if.then369, label %if.end377.critedge
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if.then369: ; preds = %do.body366
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br label %if.end377
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if.end377.critedge: ; preds = %do.body366
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br label %if.end377
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if.end377: ; preds = %if.end377.critedge, %if.then369
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br i1 undef, label %if.then383, label %if.end392.critedge
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if.then383: ; preds = %if.end377
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br label %if.end392
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if.end392.critedge: ; preds = %if.end377
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br label %if.end392
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if.end392: ; preds = %if.end392.critedge, %if.then383
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br i1 undef, label %if.then398, label %if.end399
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if.then398: ; preds = %if.end392
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br label %if.end399
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if.end399: ; preds = %if.then398, %if.end392
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invoke void bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to void (i8*, i8*)*)(i8* undef, i8* undef)
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to label %eh.cont unwind label %lpad, !clang.arc.no_objc_arc_exceptions !0
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eh.cont: ; preds = %if.end399
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br i1 undef, label %if.then430, label %if.end439.critedge
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if.then430: ; preds = %eh.cont
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%1 = call i8* @objc_retain(i8* %0)
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br label %if.end439
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lpad: ; preds = %if.end399
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%2 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__objc_personality_v0 to i8*)
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catch i8* @"OBJC_EHTYPE_$_NSException"
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unreachable
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if.end439.critedge: ; preds = %eh.cont
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%3 = call i8* @objc_retain(i8* %0)
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br label %if.end439
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if.end439: ; preds = %if.end439.critedge, %if.then430
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call void @objc_release(i8* %0), !clang.imprecise_release !0
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unreachable
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return: ; No predecessors!
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ret void
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}
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!0 = metadata !{}
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