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Tighten up checking.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52850 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -950,6 +950,8 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
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if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(V)) {
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GEP = GEPI;
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} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
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if (CE->getOpcode() == Instruction::BitCast)
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return GetConstantStringInfo(CE->getOperand(0), Str, Offset);
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if (CE->getOpcode() != Instruction::GetElementPtr)
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return false;
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GEP = CE;
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@ -960,12 +962,16 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
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if (GEP->getNumOperands() != 3)
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return false;
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// Make sure the index-ee is a pointer to array of i8.
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const PointerType *PT = cast<PointerType>(GEP->getOperand(0)->getType());
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const ArrayType *AT = dyn_cast<ArrayType>(PT->getElementType());
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if (AT == 0 || AT->getElementType() != Type::Int8Ty)
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return false;
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// Check to make sure that the first operand of the GEP is an integer and
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// has value 0 so that we are sure we're indexing into the initializer.
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if (ConstantInt *Idx = dyn_cast<ConstantInt>(GEP->getOperand(1))) {
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if (!Idx->isZero())
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return false;
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} else
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ConstantInt *FirstIdx = dyn_cast<ConstantInt>(GEP->getOperand(1));
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if (FirstIdx == 0 || !FirstIdx->isZero())
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return false;
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// If the second index isn't a ConstantInt, then this is a variable index
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