42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
//===-- ValueLatticeUtils.cpp - Utils for solving lattices ------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements common functions useful for performing data-flow
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// analyses that propagate values across function boundaries.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ValueLatticeUtils.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Instructions.h"
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using namespace llvm;
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bool llvm::canTrackArgumentsInterprocedurally(Function *F) {
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return F->hasLocalLinkage() && !F->hasAddressTaken();
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}
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bool llvm::canTrackReturnsInterprocedurally(Function *F) {
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return F->hasExactDefinition() && !F->hasFnAttribute(Attribute::Naked);
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}
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bool llvm::canTrackGlobalVariableInterprocedurally(GlobalVariable *GV) {
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if (GV->isConstant() || !GV->hasLocalLinkage() ||
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!GV->hasDefinitiveInitializer())
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return false;
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return all_of(GV->users(), [&](User *U) {
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// Currently all users of a global variable have to be none-volatile loads
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// or stores and the global cannot be stored itself.
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if (auto *Store = dyn_cast<StoreInst>(U))
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return Store->getValueOperand() != GV && !Store->isVolatile();
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if (auto *Load = dyn_cast<LoadInst>(U))
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return !Load->isVolatile();
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return false;
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});
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}
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