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//===- MemDerefPrinter.cpp - Printer for isDereferenceablePointer ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
struct MemDerefPrinter : public FunctionPass {
SmallVector<Value *, 4> Vec;
static char ID; // Pass identifcation, replacement for typeid
MemDerefPrinter() : FunctionPass(ID) {
initializeMemDerefPrinterPass(*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<DataLayoutPass>();
AU.setPreservesAll();
}
bool runOnFunction(Function &F) override;
void print(raw_ostream &OS, const Module * = nullptr) const override;
void releaseMemory() override {
Vec.clear();
}
};
}
char MemDerefPrinter::ID = 0;
INITIALIZE_PASS_BEGIN(MemDerefPrinter, "print-memderefs",
"Memory Dereferenciblity of pointers in function", false, true)
INITIALIZE_PASS_DEPENDENCY(DataLayoutPass)
INITIALIZE_PASS_END(MemDerefPrinter, "print-memderefs",
"Memory Dereferenciblity of pointers in function", false, true)
FunctionPass *llvm::createMemDerefPrinter() {
return new MemDerefPrinter();
}
bool MemDerefPrinter::runOnFunction(Function &F) {
const DataLayout *DL = &getAnalysis<DataLayoutPass>().getDataLayout();
for (auto &I: inst_range(F)) {
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
Value *PO = LI->getPointerOperand();
if (PO->isDereferenceablePointer(DL))
Vec.push_back(PO);
}
}
return false;
}
void MemDerefPrinter::print(raw_ostream &OS, const Module *M) const {
OS << "The following are dereferenceable:\n";
for (auto &V: Vec) {
V->print(OS);
OS << "\n\n";
}
}
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