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4a32ea01b3
Summary: This is patch is part of a series to introduce an Alignment type. See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html See this patch for the introduction of the type: https://reviews.llvm.org/D64790 Reviewers: courbet Subscribers: hiraditya, asbirlea, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D69253 llvm-svn: 375419
77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
//===- MemDerefPrinter.cpp - Printer for isDereferenceablePointer ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Loads.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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struct MemDerefPrinter : public FunctionPass {
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SmallVector<Value *, 4> Deref;
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SmallPtrSet<Value *, 4> DerefAndAligned;
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static char ID; // Pass identification, replacement for typeid
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MemDerefPrinter() : FunctionPass(ID) {
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initializeMemDerefPrinterPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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bool runOnFunction(Function &F) override;
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void print(raw_ostream &OS, const Module * = nullptr) const override;
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void releaseMemory() override {
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Deref.clear();
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DerefAndAligned.clear();
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}
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};
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}
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char MemDerefPrinter::ID = 0;
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INITIALIZE_PASS_BEGIN(MemDerefPrinter, "print-memderefs",
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"Memory Dereferenciblity of pointers in function", false, true)
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INITIALIZE_PASS_END(MemDerefPrinter, "print-memderefs",
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"Memory Dereferenciblity of pointers in function", false, true)
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FunctionPass *llvm::createMemDerefPrinter() {
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return new MemDerefPrinter();
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}
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bool MemDerefPrinter::runOnFunction(Function &F) {
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const DataLayout &DL = F.getParent()->getDataLayout();
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for (auto &I: instructions(F)) {
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if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
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Value *PO = LI->getPointerOperand();
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if (isDereferenceablePointer(PO, LI->getType(), DL))
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Deref.push_back(PO);
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if (isDereferenceableAndAlignedPointer(
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PO, LI->getType(), MaybeAlign(LI->getAlignment()), DL))
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DerefAndAligned.insert(PO);
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}
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}
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return false;
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}
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void MemDerefPrinter::print(raw_ostream &OS, const Module *M) const {
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OS << "The following are dereferenceable:\n";
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for (Value *V: Deref) {
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V->print(OS);
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if (DerefAndAligned.count(V))
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OS << "\t(aligned)";
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else
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OS << "\t(unaligned)";
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OS << "\n\n";
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}
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}
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