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
run(Function & F,FunctionAnalysisManager & AM)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.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