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
19using namespace llvm;
20
21PreservedAnalyses 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.getDataLayout();
30 for (auto &I : instructions(F)) {
31 if (LoadInst *LI = dyn_cast<LoadInst>(Val: &I)) {
32 Value *PO = LI->getPointerOperand();
33 if (isDereferenceablePointer(V: PO, Ty: LI->getType(), DL))
34 Deref.push_back(Elt: PO);
35 if (isDereferenceableAndAlignedPointer(V: PO, Ty: LI->getType(), Alignment: LI->getAlign(),
36 DL))
37 DerefAndAligned.insert(Ptr: PO);
38 }
39 }
40
41 OS << "The following are dereferenceable:\n";
42 for (Value *V : Deref) {
43 OS << " ";
44 V->print(O&: OS);
45 if (DerefAndAligned.count(Ptr: V))
46 OS << "\t(aligned)";
47 else
48 OS << "\t(unaligned)";
49 OS << "\n";
50 }
51 return PreservedAnalyses::all();
52}
53