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Refactor duplicated code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214328 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -97,6 +97,13 @@ bool returnTypeIsEligibleForTailCall(const Function *F,
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const ReturnInst *Ret,
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const TargetLoweringBase &TLI);
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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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bool canBeOmittedFromSymbolTable(const GlobalValue *GV);
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} // End llvm namespace
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#endif
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@ -25,6 +25,7 @@
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Transforms/Utils/GlobalStatus.h"
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using namespace llvm;
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/// ComputeLinearIndex - Given an LLVM IR aggregate type and a sequence
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@ -606,3 +607,29 @@ bool llvm::returnTypeIsEligibleForTailCall(const Function *F,
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return true;
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}
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bool llvm::canBeOmittedFromSymbolTable(const GlobalValue *GV) {
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if (!GV->hasLinkOnceODRLinkage())
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return false;
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if (GV->hasUnnamedAddr())
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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 (const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV)) {
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if (!Var->isConstant())
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return false;
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}
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// An alias can point to a variable. We could try to resolve the alias to
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// decide, but for now just don't hide them.
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if (isa<GlobalAlias>(GV))
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return false;
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GlobalStatus GS;
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if (GlobalStatus::analyzeGlobal(GV, GS))
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return false;
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return !GS.IsCompared;
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}
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@ -19,6 +19,7 @@
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Analysis/ConstantFolding.h"
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#include "llvm/Analysis/JumpInstrTableInfo.h"
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#include "llvm/CodeGen/Analysis.h"
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#include "llvm/CodeGen/GCMetadataPrinter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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@ -49,7 +50,6 @@
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include "llvm/Transforms/Utils/GlobalStatus.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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@ -253,32 +253,10 @@ bool AsmPrinter::doInitialization(Module &M) {
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}
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static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
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if (!GV->hasLinkOnceODRLinkage())
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return false;
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if (!MAI.hasWeakDefCanBeHiddenDirective())
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return false;
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if (GV->hasUnnamedAddr())
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return true;
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// This is only used for MachO, so right now it doesn't really matter how
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// we handle alias. Revisit this once the MachO linker implements aliases.
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if (isa<GlobalAlias>(GV))
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return false;
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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 (const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV)) {
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if (!Var->isConstant())
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return false;
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}
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GlobalStatus GS;
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if (!GlobalStatus::analyzeGlobal(GV, GS) && !GS.IsCompared)
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return true;
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return false;
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return canBeOmittedFromSymbolTable(GV);
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}
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void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
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@ -15,6 +15,7 @@
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#include "llvm/LTO/LTOModule.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/CodeGen/Analysis.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Metadata.h"
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@ -347,28 +348,6 @@ void LTOModule::addDefinedFunctionSymbol(const char *Name, const Function *F) {
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addDefinedSymbol(Name, F, true);
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}
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static bool canBeHidden(const GlobalValue *GV) {
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// FIXME: this is duplicated with another static function in AsmPrinter.cpp
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if (!GV->hasLinkOnceODRLinkage())
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return false;
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if (GV->hasUnnamedAddr())
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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 (const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV)) {
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if (!Var->isConstant())
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return false;
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}
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GlobalStatus GS;
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if (GlobalStatus::analyzeGlobal(GV, GS))
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return false;
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return !GS.IsCompared;
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}
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void LTOModule::addDefinedSymbol(const char *Name, const GlobalValue *def,
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bool isFunction) {
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// set alignment part log2() can have rounding errors
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@ -402,7 +381,7 @@ void LTOModule::addDefinedSymbol(const char *Name, const GlobalValue *def,
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attr |= LTO_SYMBOL_SCOPE_HIDDEN;
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else if (def->hasProtectedVisibility())
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attr |= LTO_SYMBOL_SCOPE_PROTECTED;
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else if (canBeHidden(def))
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else if (canBeOmittedFromSymbolTable(def))
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attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
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else
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attr |= LTO_SYMBOL_SCOPE_DEFAULT;
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