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//===- MemDerefPrinter.cpp - Printer for isDereferenceablePointer ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/MemDerefPrinter.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
PreservedAnalyses MemDerefPrinterPass::run(Function &F,
FunctionAnalysisManager &AM) {
OS << "Memory Dereferencibility of pointers in function '" << F.getName()
<< "'\n";
SmallVector<Value *, 4> Deref;
SmallPtrSet<Value *, 4> DerefAndAligned;
const DataLayout &DL = F.getDataLayout();
for (auto &I : instructions(F)) {
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
Value *PO = LI->getPointerOperand();
if (isDereferenceablePointer(PO, LI->getType(), DL, LI))
Deref.push_back(PO);
if (isDereferenceableAndAlignedPointer(PO, LI->getType(), LI->getAlign(),
DL, LI))
DerefAndAligned.insert(PO);
}
}
OS << "The following are dereferenceable:\n";
for (Value *V : Deref) {
OS << " ";
V->print(OS);
if (DerefAndAligned.count(V))
OS << "\t(aligned)";
else
OS << "\t(unaligned)";
OS << "\n";
}
return PreservedAnalyses::all();
}
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