| 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 | |
| 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.getParent()->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 |