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//===-- ValueLatticeUtils.cpp - Utils for solving lattices ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements common functions useful for performing data-flow
// analyses that propagate values across function boundaries.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/ValueLatticeUtils.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Instructions.h"
using namespace llvm;
bool llvm::canTrackArgumentsInterprocedurally(Function *F) {
return F->hasLocalLinkage() && !F->hasAddressTaken();
}
bool llvm::canTrackReturnsInterprocedurally(Function *F) {
return F->hasExactDefinition() && !F->hasFnAttribute(Attribute::Naked);
}
bool llvm::canTrackGlobalVariableInterprocedurally(GlobalVariable *GV) {
if (GV->isConstant() || !GV->hasLocalLinkage() ||
!GV->hasDefinitiveInitializer())
return false;
return !any_of(GV->users(), [&](User *U) {
if (auto *Store = dyn_cast<StoreInst>(U)) {
if (Store->getValueOperand() == GV || Store->isVolatile())
return true;
} else if (auto *Load = dyn_cast<LoadInst>(U)) {
if (Load->isVolatile())
return true;
} else {
return true;
}
return false;
});
}
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