1//===-- ValueLatticeUtils.h - 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-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file declares common functions useful for performing data-flow analyses 10// that propagate values across function boundaries. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_ANALYSIS_VALUELATTICEUTILS_H 15#define LLVM_ANALYSIS_VALUELATTICEUTILS_H 16 17namespace llvm { 18 19class Function; 20class GlobalVariable; 21 22/// Determine if the values of the given function's arguments can be tracked 23/// interprocedurally. The value of an argument can be tracked if the function 24/// has local linkage and its address is not taken. 25bool canTrackArgumentsInterprocedurally(Function *F); 26 27/// Determine if the values of the given function's returns can be tracked 28/// interprocedurally. Return values can be tracked if the function has an 29/// exact definition and it doesn't have the "naked" attribute. Naked functions 30/// may contain assembly code that returns untrackable values. 31bool canTrackReturnsInterprocedurally(Function *F); 32 33/// Determine if the value maintained in the given global variable can be 34/// tracked interprocedurally. A value can be tracked if the global variable 35/// has local linkage and is only used by non-volatile loads and stores. 36bool canTrackGlobalVariableInterprocedurally(GlobalVariable *GV); 37 38} // end namespace llvm 39 40#endif // LLVM_ANALYSIS_VALUELATTICEUTILS_H 41