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//===-- ValueLatticeUtils.h - Utils for solving lattices --------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// This file declares common functions useful for performing data-flow analyses

// that propagate values across function boundaries.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_VALUELATTICEUTILS_H

#define LLVM_ANALYSIS_VALUELATTICEUTILS_H

namespace llvm {

class Function;

class GlobalVariable;

/// Determine if the values of the given function's arguments can be tracked

/// interprocedurally. The value of an argument can be tracked if the function

/// has local linkage and its address is not taken.

bool canTrackArgumentsInterprocedurally(Function *F);

/// Determine if the values of the given function's returns can be tracked

/// interprocedurally. Return values can be tracked if the function has an

/// exact definition and it doesn't have the "naked" attribute. Naked functions

/// may contain assembly code that returns untrackable values.

bool canTrackReturnsInterprocedurally(Function *F);

/// Determine if the value maintained in the given global variable can be

/// tracked interprocedurally. A value can be tracked if the global variable

/// has local linkage and is only used by non-volatile loads and stores.

bool canTrackGlobalVariableInterprocedurally(GlobalVariable *GV);

} // end namespace llvm

#endif // LLVM_ANALYSIS_VALUELATTICEUTILS_H