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Add testcase and fix for yet another case where we query the size an

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abstract type.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18678 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-12-08 23:56:15 +00:00
parent ea1c45405d
commit c49741d047
2 changed files with 32 additions and 8 deletions
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18
lib/Analysis/BasicAliasAnalysis.cpp
View File

@ -456,7 +456,7 @@ CheckGEPInstructions(const Type* BasePtr1Ty, std::vector<Value*> &GEP1Ops,
if (BasePtr1Ty != BasePtr2Ty)
return MayAlias;
const Type *GEPPointerTy = BasePtr1Ty;
const PointerType *GEPPointerTy = cast<PointerType>(BasePtr1Ty);
// Find the (possibly empty) initial sequence of equal values... which are not
// necessarily constants.
@ -657,14 +657,16 @@ CheckGEPInstructions(const Type* BasePtr1Ty, std::vector<Value*> &GEP1Ops,
}
}
int64_t Offset1 = getTargetData().getIndexedOffset(GEPPointerTy, GEP1Ops);
int64_t Offset2 = getTargetData().getIndexedOffset(GEPPointerTy, GEP2Ops);
assert(Offset1 < Offset2 &&"There is at least one different constant here!");
if (GEPPointerTy->getElementType()->isSized()) {
int64_t Offset1 = getTargetData().getIndexedOffset(GEPPointerTy, GEP1Ops);
int64_t Offset2 = getTargetData().getIndexedOffset(GEPPointerTy, GEP2Ops);
assert(Offset1<Offset2 && "There is at least one different constant here!");
if ((uint64_t)(Offset2-Offset1) >= SizeMax) {
//std::cerr << "Determined that these two GEP's don't alias ["
// << SizeMax << " bytes]: \n" << *GEP1 << *GEP2;
return NoAlias;
if ((uint64_t)(Offset2-Offset1) >= SizeMax) {
//std::cerr << "Determined that these two GEP's don't alias ["
// << SizeMax << " bytes]: \n" << *GEP1 << *GEP2;
return NoAlias;
}
}
return MayAlias;
}

22
test/Analysis/BasicAA/2004-12-08-BasicAACrash2.ll Normal file
View File

@ -0,0 +1,22 @@
; RUN: llvm-as < %s | opt -dse
"java/lang/Object" = type { %struct.llvm_java_object_base }
"java/lang/StringBuffer" = type { "java/lang/Object", int, { "java/lang/Object", uint, [0 x ushort] }*, bool }
%struct.llvm_java_object_base = type opaque
implementation ; Functions:
void "java/lang/StringBuffer/ensureCapacity_unsynchronized(I)V"() {
bc0:
%tmp = getelementptr "java/lang/StringBuffer"* null, int 0, uint 3 ; <bool*> [#uses=1]
br bool false, label %bc16, label %bc7
bc16: ; preds = %bc0
%tmp91 = getelementptr "java/lang/StringBuffer"* null, int 0, uint 2 ; <{ "java/lang/Object", uint, [0 x ushort] }**> [#uses=1]
store { "java/lang/Object", uint, [0 x ushort] }* null, { "java/lang/Object", uint, [0 x ushort] }** %tmp91
store bool false, bool* %tmp
ret void
bc7: ; preds = %bc0
ret void
}