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Add testcase and fix for 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@18676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-12-08 23:42:11 +00:00
parent 5cb77fb193
commit a95cf3024b
2 changed files with 36 additions and 7 deletions
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19
lib/Analysis/BasicAliasAnalysis.cpp
View File

@ -410,13 +410,18 @@ BasicAliasAnalysis::alias(const Value *V1, unsigned V1Size,
// the size of the argument... build an index vector that is equal to
// the arguments provided, except substitute 0's for any variable
// indexes we find...
for (unsigned i = 0; i != GEPOperands.size(); ++i)
if (!isa<ConstantInt>(GEPOperands[i]))
GEPOperands[i] =Constant::getNullValue(GEPOperands[i]->getType());
int64_t Offset = getTargetData().getIndexedOffset(BasePtr->getType(),
GEPOperands);
if (Offset >= (int64_t)V2Size || Offset <= -(int64_t)V1Size)
return NoAlias;
if (cast<PointerType>(
BasePtr->getType())->getElementType()->isSized()) {
for (unsigned i = 0; i != GEPOperands.size(); ++i)
if (!isa<ConstantInt>(GEPOperands[i]))
GEPOperands[i] =
Constant::getNullValue(GEPOperands[i]->getType());
int64_t Offset =
getTargetData().getIndexedOffset(BasePtr->getType(), GEPOperands);
if (Offset >= (int64_t)V2Size || Offset <= -(int64_t)V1Size)
return NoAlias;
}
}
}
}

24
test/Analysis/BasicAA/2004-12-08-BasicAACrash.ll Normal file
View File

@ -0,0 +1,24 @@
; RUN: llvm-as < %s | opt -licm
"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/setLength(I)V"(%struct.llvm_java_object_base*) {
bc0:
br bool false, label %bc40, label %bc65
bc65: ; preds = %bc0, %bc40
ret void
bc40: ; preds = %bc0, %bc40
%tmp75 = cast %struct.llvm_java_object_base* %0 to "java/lang/StringBuffer"* ; <"java/lang/StringBuffer"*> [#uses=1]
%tmp76 = getelementptr "java/lang/StringBuffer"* %tmp75, int 0, uint 1 ; <int*> [#uses=1]
store int 0, int* %tmp76
%tmp381 = cast %struct.llvm_java_object_base* %0 to "java/lang/StringBuffer"* ; <"java/lang/StringBuffer"*> [#uses=1]
%tmp392 = getelementptr "java/lang/StringBuffer"* %tmp381, int 0, uint 1 ; <int*> [#uses=1]
%tmp403 = load int* %tmp392 ; <int> [#uses=0]
br bool false, label %bc40, label %bc65
}