xref: /freebsd/contrib/llvm-project/llvm/lib/Analysis/MemDerefPrinter.cpp (revision 0fca6ea1d4eea4c934cfff25ac9ee8ad6fe95583)
10b57cec5SDimitry Andric //===- MemDerefPrinter.cpp - Printer for isDereferenceablePointer ---------===//
20b57cec5SDimitry Andric //
30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
60b57cec5SDimitry Andric //
70b57cec5SDimitry Andric //===----------------------------------------------------------------------===//
80b57cec5SDimitry Andric 
9e8d8bef9SDimitry Andric #include "llvm/Analysis/MemDerefPrinter.h"
100b57cec5SDimitry Andric #include "llvm/Analysis/Loads.h"
110b57cec5SDimitry Andric #include "llvm/Analysis/Passes.h"
120b57cec5SDimitry Andric #include "llvm/IR/InstIterator.h"
135ffd83dbSDimitry Andric #include "llvm/IR/Instructions.h"
140b57cec5SDimitry Andric #include "llvm/IR/Module.h"
15480093f4SDimitry Andric #include "llvm/InitializePasses.h"
165ffd83dbSDimitry Andric #include "llvm/Pass.h"
170b57cec5SDimitry Andric #include "llvm/Support/raw_ostream.h"
18e8d8bef9SDimitry Andric 
190b57cec5SDimitry Andric using namespace llvm;
200b57cec5SDimitry Andric 
run(Function & F,FunctionAnalysisManager & AM)21e8d8bef9SDimitry Andric PreservedAnalyses MemDerefPrinterPass::run(Function &F,
22e8d8bef9SDimitry Andric                                            FunctionAnalysisManager &AM) {
23e8d8bef9SDimitry Andric   OS << "Memory Dereferencibility of pointers in function '" << F.getName()
24e8d8bef9SDimitry Andric      << "'\n";
25e8d8bef9SDimitry Andric 
26e8d8bef9SDimitry Andric   SmallVector<Value *, 4> Deref;
27e8d8bef9SDimitry Andric   SmallPtrSet<Value *, 4> DerefAndAligned;
28e8d8bef9SDimitry Andric 
29*0fca6ea1SDimitry Andric   const DataLayout &DL = F.getDataLayout();
30e8d8bef9SDimitry Andric   for (auto &I : instructions(F)) {
31e8d8bef9SDimitry Andric     if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
32e8d8bef9SDimitry Andric       Value *PO = LI->getPointerOperand();
33e8d8bef9SDimitry Andric       if (isDereferenceablePointer(PO, LI->getType(), DL))
34e8d8bef9SDimitry Andric         Deref.push_back(PO);
351fd87a68SDimitry Andric       if (isDereferenceableAndAlignedPointer(PO, LI->getType(), LI->getAlign(),
361fd87a68SDimitry Andric                                              DL))
37e8d8bef9SDimitry Andric         DerefAndAligned.insert(PO);
38e8d8bef9SDimitry Andric     }
39e8d8bef9SDimitry Andric   }
40e8d8bef9SDimitry Andric 
41e8d8bef9SDimitry Andric   OS << "The following are dereferenceable:\n";
42e8d8bef9SDimitry Andric   for (Value *V : Deref) {
43fe6060f1SDimitry Andric     OS << "  ";
44e8d8bef9SDimitry Andric     V->print(OS);
45e8d8bef9SDimitry Andric     if (DerefAndAligned.count(V))
46e8d8bef9SDimitry Andric       OS << "\t(aligned)";
47e8d8bef9SDimitry Andric     else
48e8d8bef9SDimitry Andric       OS << "\t(unaligned)";
49fe6060f1SDimitry Andric     OS << "\n";
50e8d8bef9SDimitry Andric   }
51e8d8bef9SDimitry Andric   return PreservedAnalyses::all();
52e8d8bef9SDimitry Andric }
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