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Add testcase and fix for yet another case where we query the size an
abstract type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18678 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -456,7 +456,7 @@ CheckGEPInstructions(const Type* BasePtr1Ty, std::vector<Value*> &GEP1Ops,
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if (BasePtr1Ty != BasePtr2Ty)
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return MayAlias;
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const Type *GEPPointerTy = BasePtr1Ty;
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const PointerType *GEPPointerTy = cast<PointerType>(BasePtr1Ty);
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// Find the (possibly empty) initial sequence of equal values... which are not
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// necessarily constants.
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@ -657,14 +657,16 @@ CheckGEPInstructions(const Type* BasePtr1Ty, std::vector<Value*> &GEP1Ops,
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}
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}
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int64_t Offset1 = getTargetData().getIndexedOffset(GEPPointerTy, GEP1Ops);
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int64_t Offset2 = getTargetData().getIndexedOffset(GEPPointerTy, GEP2Ops);
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assert(Offset1 < Offset2 &&"There is at least one different constant here!");
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if (GEPPointerTy->getElementType()->isSized()) {
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int64_t Offset1 = getTargetData().getIndexedOffset(GEPPointerTy, GEP1Ops);
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int64_t Offset2 = getTargetData().getIndexedOffset(GEPPointerTy, GEP2Ops);
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assert(Offset1<Offset2 && "There is at least one different constant here!");
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if ((uint64_t)(Offset2-Offset1) >= SizeMax) {
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//std::cerr << "Determined that these two GEP's don't alias ["
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// << SizeMax << " bytes]: \n" << *GEP1 << *GEP2;
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return NoAlias;
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if ((uint64_t)(Offset2-Offset1) >= SizeMax) {
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//std::cerr << "Determined that these two GEP's don't alias ["
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// << SizeMax << " bytes]: \n" << *GEP1 << *GEP2;
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return NoAlias;
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}
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}
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return MayAlias;
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}
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22
test/Analysis/BasicAA/2004-12-08-BasicAACrash2.ll
Normal file
22
test/Analysis/BasicAA/2004-12-08-BasicAACrash2.ll
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@ -0,0 +1,22 @@
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; RUN: llvm-as < %s | opt -dse
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"java/lang/Object" = type { %struct.llvm_java_object_base }
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"java/lang/StringBuffer" = type { "java/lang/Object", int, { "java/lang/Object", uint, [0 x ushort] }*, bool }
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%struct.llvm_java_object_base = type opaque
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implementation ; Functions:
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void "java/lang/StringBuffer/ensureCapacity_unsynchronized(I)V"() {
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bc0:
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%tmp = getelementptr "java/lang/StringBuffer"* null, int 0, uint 3 ; <bool*> [#uses=1]
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br bool false, label %bc16, label %bc7
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bc16: ; preds = %bc0
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%tmp91 = getelementptr "java/lang/StringBuffer"* null, int 0, uint 2 ; <{ "java/lang/Object", uint, [0 x ushort] }**> [#uses=1]
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store { "java/lang/Object", uint, [0 x ushort] }* null, { "java/lang/Object", uint, [0 x ushort] }** %tmp91
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store bool false, bool* %tmp
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ret void
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bc7: ; preds = %bc0
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ret void
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}
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