-namespace {
-class InstCombineFortifiedLibCalls : public SimplifyFortifiedLibCalls {
- InstCombiner *IC;
-protected:
- void replaceCall(Value *With) {
- NewInstruction = IC->ReplaceInstUsesWith(*CI, With);
- }
- bool isFoldable(unsigned SizeCIOp, unsigned SizeArgOp, bool isString) const {
- if (CI->getArgOperand(SizeCIOp) == CI->getArgOperand(SizeArgOp))
- return true;
- if (ConstantInt *SizeCI =
- dyn_cast<ConstantInt>(CI->getArgOperand(SizeCIOp))) {
- if (SizeCI->isAllOnesValue())
- return true;
- if (isString) {
- uint64_t Len = GetStringLength(CI->getArgOperand(SizeArgOp));
- // If the length is 0 we don't know how long it is and so we can't
- // remove the check.
- if (Len == 0) return false;
- return SizeCI->getZExtValue() >= Len;
- }
- if (ConstantInt *Arg = dyn_cast<ConstantInt>(
- CI->getArgOperand(SizeArgOp)))
- return SizeCI->getZExtValue() >= Arg->getZExtValue();
- }
- return false;
- }
-public:
- InstCombineFortifiedLibCalls(InstCombiner *IC) : IC(IC), NewInstruction(0) { }
- Instruction *NewInstruction;
-};
-} // end anonymous namespace
-