43 lines · cpp
1//===-- ValueLatticeUtils.cpp - Utils for solving lattices ------*- C++ -*-===//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-exception6//7//===----------------------------------------------------------------------===//8//9// This file implements common functions useful for performing data-flow10// analyses that propagate values across function boundaries.11//12//===----------------------------------------------------------------------===//13 14#include "llvm/Analysis/ValueLatticeUtils.h"15#include "llvm/IR/GlobalVariable.h"16#include "llvm/IR/Instructions.h"17using namespace llvm;18 19bool llvm::canTrackArgumentsInterprocedurally(Function *F) {20 return F->hasLocalLinkage() && !F->hasAddressTaken();21}22 23bool llvm::canTrackReturnsInterprocedurally(Function *F) {24 return F->hasExactDefinition() && !F->hasFnAttribute(Attribute::Naked);25}26 27bool llvm::canTrackGlobalVariableInterprocedurally(GlobalVariable *GV) {28 if (GV->isConstant() || !GV->hasLocalLinkage() ||29 !GV->hasDefinitiveInitializer())30 return false;31 return all_of(GV->users(), [&](User *U) {32 // Currently all users of a global variable have to be non-volatile loads33 // or stores of the global type, and the global cannot be stored itself.34 if (auto *Store = dyn_cast<StoreInst>(U))35 return Store->getValueOperand() != GV && !Store->isVolatile() &&36 Store->getValueOperand()->getType() == GV->getValueType();37 if (auto *Load = dyn_cast<LoadInst>(U))38 return !Load->isVolatile() && Load->getType() == GV->getValueType();39 40 return false;41 });42}43