llvm/lib/Analysis/MemoryLocation.cpp

//===- MemoryLocation.cpp - Memory location descriptions -------------------==//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
using namespace llvm;

MemoryLocation MemoryLocation::get(const LoadInst *LI) {
  AAMDNodes AATags;
  LI->getAAMetadata(AATags);
  const auto &DL = LI->getModule()->getDataLayout();

  return MemoryLocation(LI->getPointerOperand(),
                        DL.getTypeStoreSize(LI->getType()), AATags);
}

MemoryLocation MemoryLocation::get(const StoreInst *SI) {
  AAMDNodes AATags;
  SI->getAAMetadata(AATags);
  const auto &DL = SI->getModule()->getDataLayout();

  return MemoryLocation(SI->getPointerOperand(),
                        DL.getTypeStoreSize(SI->getValueOperand()->getType()),
                        AATags);
}

MemoryLocation MemoryLocation::get(const VAArgInst *VI) {
  AAMDNodes AATags;
  VI->getAAMetadata(AATags);

  return MemoryLocation(VI->getPointerOperand(), UnknownSize, AATags);
}

MemoryLocation MemoryLocation::get(const AtomicCmpXchgInst *CXI) {
  AAMDNodes AATags;
  CXI->getAAMetadata(AATags);
  const auto &DL = CXI->getModule()->getDataLayout();

  return MemoryLocation(
      CXI->getPointerOperand(),
      DL.getTypeStoreSize(CXI->getCompareOperand()->getType()), AATags);
}

MemoryLocation MemoryLocation::get(const AtomicRMWInst *RMWI) {
  AAMDNodes AATags;
  RMWI->getAAMetadata(AATags);
  const auto &DL = RMWI->getModule()->getDataLayout();

  return MemoryLocation(RMWI->getPointerOperand(),
                        DL.getTypeStoreSize(RMWI->getValOperand()->getType()),
                        AATags);
}

MemoryLocation MemoryLocation::getForSource(const MemTransferInst *MTI) {
  uint64_t Size = UnknownSize;
  if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
    Size = C->getValue().getZExtValue();

  // memcpy/memmove can have AA tags. For memcpy, they apply
  // to both the source and the destination.
  AAMDNodes AATags;
  MTI->getAAMetadata(AATags);

  return MemoryLocation(MTI->getRawSource(), Size, AATags);
}

MemoryLocation MemoryLocation::getForDest(const MemIntrinsic *MTI) {
  uint64_t Size = UnknownSize;
  if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
    Size = C->getValue().getZExtValue();

  // memcpy/memmove can have AA tags. For memcpy, they apply
  // to both the source and the destination.
  AAMDNodes AATags;
  MTI->getAAMetadata(AATags);

  return MemoryLocation(MTI->getRawDest(), Size, AATags);
}