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