1 //===- MemDerefPrinter.cpp - Printer for isDereferenceablePointer ---------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/Analysis/MemDerefPrinter.h" 10 #include "llvm/Analysis/Loads.h" 11 #include "llvm/IR/InstIterator.h" 12 #include "llvm/IR/Instructions.h" 13 #include "llvm/Pass.h" 14 #include "llvm/Support/raw_ostream.h" 15 16 using namespace llvm; 17 18 PreservedAnalyses MemDerefPrinterPass::run(Function &F, 19 FunctionAnalysisManager &AM) { 20 OS << "Memory Dereferencibility of pointers in function '" << F.getName() 21 << "'\n"; 22 23 SmallVector<Value *, 4> Deref; 24 SmallPtrSet<Value *, 4> DerefAndAligned; 25 26 const DataLayout &DL = F.getDataLayout(); 27 for (auto &I : instructions(F)) { 28 if (LoadInst *LI = dyn_cast<LoadInst>(&I)) { 29 Value *PO = LI->getPointerOperand(); 30 if (isDereferenceablePointer(PO, LI->getType(), DL, LI)) 31 Deref.push_back(PO); 32 if (isDereferenceableAndAlignedPointer(PO, LI->getType(), LI->getAlign(), 33 DL, LI)) 34 DerefAndAligned.insert(PO); 35 } 36 } 37 38 OS << "The following are dereferenceable:\n"; 39 for (Value *V : Deref) { 40 OS << " "; 41 V->print(OS); 42 if (DerefAndAligned.count(V)) 43 OS << "\t(aligned)"; 44 else 45 OS << "\t(unaligned)"; 46 OS << "\n"; 47 } 48 return PreservedAnalyses::all(); 49 } 50