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 17 namespace llvm { 18 19 class Function; 20 class 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. 25 bool 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. 31 bool 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. 36 bool canTrackGlobalVariableInterprocedurally(GlobalVariable *GV); 37 38 } // end namespace llvm 39 40 #endif // LLVM_ANALYSIS_VALUELATTICEUTILS_H 41