| //===- Analysis/ObjectUtils.h - analysis utils for object files -*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_ANALYSIS_OBJECT_UTILS_H |
| #define LLVM_ANALYSIS_OBJECT_UTILS_H |
| |
| #include "llvm/IR/GlobalVariable.h" |
| |
| namespace llvm { |
| |
| /// True if GV can be left out of the object symbol table. This is the case |
| /// for linkonce_odr values whose address is not significant. While legal, it is |
| /// not normally profitable to omit them from the .o symbol table. Using this |
| /// analysis makes sense when the information can be passed down to the linker |
| /// or we are in LTO. |
| inline bool canBeOmittedFromSymbolTable(const GlobalValue *GV) { |
| if (!GV->hasLinkOnceODRLinkage()) |
| return false; |
| |
| // We assume that anyone who sets global unnamed_addr on a non-constant knows |
| // what they're doing. |
| if (GV->hasGlobalUnnamedAddr()) |
| return true; |
| |
| // If it is a non constant variable, it needs to be uniqued across shared |
| // objects. |
| if (auto *Var = dyn_cast<GlobalVariable>(GV)) |
| if (!Var->isConstant()) |
| return false; |
| |
| return GV->hasAtLeastLocalUnnamedAddr(); |
| } |
| |
| } |
| |
| #endif |
