79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
//===- MemDerefPrinter.cpp - Printer for isDereferenceablePointer ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Passes.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/Analysis/MemoryDependenceAnalysis.h"
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#include "llvm/Analysis/Loads.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, DL))
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Deref.push_back(PO);
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if (isDereferenceableAndAlignedPointer(PO, 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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