search for: underlyingpointer

...*InstrOrdering) { > > // Must be a strlen. > LibFunc Func; > Function *Callee = CI->getCalledFunction(); > if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || > Func != LibFunc_strlen) > return false; > > Value *Dst = CI->getOperand(0); > Instruction *UnderlyingPointer = > dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); > if (!UnderlyingPointer) > return false; > if (!isStringFromCalloc(Dst, TLI)) > return false; > > if (memoryIsNotModifiedBetween(UnderlyingPointer, CI, AA)) { > Value *Len = ConstantInt::get(CI->getType(), 0)...

...&IOL, DenseMap<Instruction *, size_t> *InstrOrdering) { // Must be a strlen. LibFunc Func; Function *Callee = CI->getCalledFunction(); if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || Func != LibFunc_strlen) return false; Value *Dst = CI->getOperand(0); Instruction *UnderlyingPointer = dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); if (!UnderlyingPointer) return false; if (!isStringFromCalloc(Dst, TLI)) return false; if (memoryIsNotModifiedBetween(UnderlyingPointer, CI, AA)) { Value *Len = ConstantInt::get(CI->getType(), 0); CI->replaceAllUsesWith(Len); CI-&g...

...*InstrOrdering) { > > // Must be a strlen. > LibFunc Func; > Function *Callee = CI->getCalledFunction(); > if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || > Func != LibFunc_strlen) > return false; > > Value *Dst = CI->getOperand(0); > Instruction *UnderlyingPointer = > dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); > if (!UnderlyingPointer) > return false; > if (!isStringFromCalloc(Dst, TLI)) > return false; > > if (memoryIsNotModifiedBetween(UnderlyingPointer, CI, AA)) { > Value *Len = ConstantInt::get(CI->getType(), 0)...

...e = CI->getCalledFunction(); >>>> if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || >>>> Func != LibFunc_strlen) >>>> return false; >>>> >>>> Value *Dst = CI->getOperand(0); >>>> Instruction *UnderlyingPointer = dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); >>>> if (!UnderlyingPointer) >>>> return false; >>>> if (isStringFromCalloc(Dst, TLI)) >>>> return false; >>>> errs() << "before\n"; >>>&gt...

...> // Must be a strlen. > LibFunc Func; > Function *Callee = CI->getCalledFunction(); > if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || > Func != LibFunc_strlen) > return false; > > Value *Dst = CI->getOperand(0); > Instruction *UnderlyingPointer = dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); > if (!UnderlyingPointer) > return false; > if (isStringFromCalloc(Dst, TLI)) > return false; > errs() << "before\n"; > if (memoryIsNotModifiedBetween(UnderlyingPointer, CI, AA)) { <---...

...Instruction *, size_t> *InstrOrdering) { // Must be a strlen. LibFunc Func; Function *Callee = CI->getCalledFunction(); if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || Func != LibFunc_strlen) return false; Value *Dst = CI->getOperand(0); Instruction *UnderlyingPointer = dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); if (!UnderlyingPointer) return false; if (isStringFromCalloc(Dst, TLI)) return false; errs() << "before\n"; if (memoryIsNotModifiedBetween(UnderlyingPointer, CI, AA)) { <--- CRASH errs() << &qu...

...;> LibFunc Func; >> Function *Callee = CI->getCalledFunction(); >> if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || >> Func != LibFunc_strlen) >> return false; >> >> Value *Dst = CI->getOperand(0); >> Instruction *UnderlyingPointer = dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); >> if (!UnderlyingPointer) >> return false; >> if (isStringFromCalloc(Dst, TLI)) >> return false; >> errs() << "before\n"; >> if (memoryIsNotModifiedBetween(UnderlyingPoi...

...LibFunc Func; > Function *Callee = CI->getCalledFunction(); > if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || > Func != LibFunc_strlen) > return false; > > Value *Dst = CI->getOperand(0); > Instruction *UnderlyingPointer = dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); > if (!UnderlyingPointer) > return false; > if (isStringFromCalloc(Dst, TLI)) > return false; > errs() << "before\n"; > if (memoryIsNotModifiedBetween(Underly...

memoryIsNotModifiedBetween is precisely the sort of expensive walk we shouldn't be doing... I'm surprised it hasn't caused any serious issues yet.  Ideally, what we should be doing is using MemorySSA to find a dependency from the memset: if the closest dependency is the malloc, there aren't any stores between the memset and the malloc.  (But we aren't using MemorySSA in

...t;> Function *Callee = CI->getCalledFunction(); >>> if (!TLI->getLibFunc(*Callee, Func) || !TLI->has(Func) || >>> Func != LibFunc_strlen) >>> return false; >>> >>> Value *Dst = CI->getOperand(0); >>> Instruction *UnderlyingPointer = dyn_cast<Instruction>(GetUnderlyingObject(Dst, DL)); >>> if (!UnderlyingPointer) >>> return false; >>> if (isStringFromCalloc(Dst, TLI)) >>> return false; >>> errs() << "before\n"; >>> if (memoryIsNotModif...