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/Analysis/Passes.h" 12 #include "llvm/IR/InstIterator.h" 13 #include "llvm/IR/Instructions.h" 14 #include "llvm/IR/Module.h" 15 #include "llvm/InitializePasses.h" 16 #include "llvm/Pass.h" 17 #include "llvm/Support/raw_ostream.h" 18 19 using namespace llvm; 20 21 PreservedAnalyses MemDerefPrinterPass::run(Function &F, 22 FunctionAnalysisManager &AM) { 23 OS << "Memory Dereferencibility of pointers in function '" << F.getName() 24 << "'\n"; 25 26 SmallVector<Value *, 4> Deref; 27 SmallPtrSet<Value *, 4> DerefAndAligned; 28 29 const DataLayout &DL = F.getParent()->getDataLayout(); 30 for (auto &I : instructions(F)) { 31 if (LoadInst *LI = dyn_cast<LoadInst>(&I)) { 32 Value *PO = LI->getPointerOperand(); 33 if (isDereferenceablePointer(PO, LI->getType(), DL)) 34 Deref.push_back(PO); 35 if (isDereferenceableAndAlignedPointer(PO, LI->getType(), LI->getAlign(), 36 DL)) 37 DerefAndAligned.insert(PO); 38 } 39 } 40 41 OS << "The following are dereferenceable:\n"; 42 for (Value *V : Deref) { 43 OS << " "; 44 V->print(OS); 45 if (DerefAndAligned.count(V)) 46 OS << "\t(aligned)"; 47 else 48 OS << "\t(unaligned)"; 49 OS << "\n"; 50 } 51 return PreservedAnalyses::all(); 52 } 53