X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FTargetLoweringObjectFile.cpp;h=a0b0d8f240465b7c8267893fd553b444ea4a1738;hb=dc8dfe1b86ab88d4db816714fa38951cd1b843d5;hp=39e045919ab0d47206474586823a399b0cf498a0;hpb=575fc08c48c26021c8acaff29ac572c846a12095;p=oota-llvm.git diff --git a/lib/Target/TargetLoweringObjectFile.cpp b/lib/Target/TargetLoweringObjectFile.cpp index 39e045919ab..a0b0d8f2404 100644 --- a/lib/Target/TargetLoweringObjectFile.cpp +++ b/lib/Target/TargetLoweringObjectFile.cpp @@ -30,6 +30,7 @@ #include "llvm/Target/TargetLowering.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetOptions.h" +#include "llvm/Target/TargetSubtargetInfo.h" using namespace llvm; //===----------------------------------------------------------------------===// @@ -42,9 +43,8 @@ using namespace llvm; void TargetLoweringObjectFile::Initialize(MCContext &ctx, const TargetMachine &TM) { Ctx = &ctx; - DL = TM.getDataLayout(); - InitMCObjectFileInfo(TM.getTargetTriple(), - TM.getRelocationModel(), TM.getCodeModel(), *Ctx); + InitMCObjectFileInfo(TM.getTargetTriple(), TM.getRelocationModel(), + TM.getCodeModel(), *Ctx); } TargetLoweringObjectFile::~TargetLoweringObjectFile() { @@ -106,10 +106,10 @@ MCSymbol *TargetLoweringObjectFile::getSymbolWithGlobalValueBase( assert(!Suffix.empty()); SmallString<60> NameStr; - NameStr += DL->getPrivateGlobalPrefix(); + NameStr += GV->getParent()->getDataLayout().getPrivateGlobalPrefix(); TM.getNameWithPrefix(NameStr, GV, Mang); NameStr.append(Suffix.begin(), Suffix.end()); - return Ctx->GetOrCreateSymbol(NameStr.str()); + return Ctx->getOrCreateSymbol(NameStr); } MCSymbol *TargetLoweringObjectFile::getCFIPersonalitySymbol( @@ -119,7 +119,7 @@ MCSymbol *TargetLoweringObjectFile::getCFIPersonalitySymbol( } void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer, - const TargetMachine &TM, + const DataLayout &, const MCSymbol *Sym) const { } @@ -169,14 +169,13 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV, // If the initializer for the global contains something that requires a // relocation, then we may have to drop this into a writable data section // even though it is marked const. - switch (C->getRelocationInfo()) { - case Constant::NoRelocation: + if (!C->needsRelocation()) { // If the global is required to have a unique address, it can't be put // into a mergable section: just drop it into the general read-only // section instead. if (!GVar->hasUnnamedAddr()) return SectionKind::getReadOnly(); - + // If initializer is a null-terminated string, put it in a "cstring" // section of the right width. if (ArrayType *ATy = dyn_cast(C->getType())) { @@ -199,27 +198,15 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV, // Otherwise, just drop it into a mergable constant section. If we have // a section for this size, use it, otherwise use the arbitrary sized // mergable section. - switch (TM.getDataLayout()->getTypeAllocSize(C->getType())) { + switch (GV->getParent()->getDataLayout().getTypeAllocSize(C->getType())) { case 4: return SectionKind::getMergeableConst4(); case 8: return SectionKind::getMergeableConst8(); case 16: return SectionKind::getMergeableConst16(); - default: return SectionKind::getMergeableConst(); - } - - case Constant::LocalRelocation: - // In static relocation model, the linker will resolve all addresses, so - // the relocation entries will actually be constants by the time the app - // starts up. However, we can't put this into a mergable section, because - // the linker doesn't take relocations into consideration when it tries to - // merge entries in the section. - if (ReloModel == Reloc::Static) + default: return SectionKind::getReadOnly(); + } - // Otherwise, the dynamic linker needs to fix it up, put it in the - // writable data.rel.local section. - return SectionKind::getReadOnlyWithRelLocal(); - - case Constant::GlobalRelocations: + } else { // In static relocation model, the linker will resolve all addresses, so // the relocation entries will actually be constants by the time the app // starts up. However, we can't put this into a mergable section, because @@ -240,25 +227,20 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV, // globals together onto fewer pages, improving the locality of the dynamic // linker. if (ReloModel == Reloc::Static) - return SectionKind::getDataNoRel(); - - switch (C->getRelocationInfo()) { - case Constant::NoRelocation: - return SectionKind::getDataNoRel(); - case Constant::LocalRelocation: - return SectionKind::getDataRelLocal(); - case Constant::GlobalRelocations: - return SectionKind::getDataRel(); - } - llvm_unreachable("Invalid relocation"); + return SectionKind::getData(); + + if (C->needsRelocation()) + return SectionKind::getData(); + return SectionKind::getData(); } -/// SectionForGlobal - This method computes the appropriate section to emit -/// the specified global variable or function definition. This should not -/// be passed external (or available externally) globals. -const MCSection *TargetLoweringObjectFile:: -SectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler &Mang, - const TargetMachine &TM) const { +/// This method computes the appropriate section to emit the specified global +/// variable or function definition. This should not be passed external (or +/// available externally) globals. +MCSection * +TargetLoweringObjectFile::SectionForGlobal(const GlobalValue *GV, + SectionKind Kind, Mangler &Mang, + const TargetMachine &TM) const { // Select section name. if (GV->hasSection()) return getExplicitSectionGlobal(GV, Kind, Mang, TM); @@ -268,36 +250,34 @@ SectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler &Mang, return SelectSectionForGlobal(GV, Kind, Mang, TM); } -bool TargetLoweringObjectFile::isSectionAtomizableBySymbols( - const MCSection &Section) const { - return false; +MCSection *TargetLoweringObjectFile::getSectionForJumpTable( + const Function &F, Mangler &Mang, const TargetMachine &TM) const { + return getSectionForConstant(F.getParent()->getDataLayout(), + SectionKind::getReadOnly(), /*C=*/nullptr); } -// Lame default implementation. Calculate the section name for global. -const MCSection * -TargetLoweringObjectFile::SelectSectionForGlobal(const GlobalValue *GV, - SectionKind Kind, - Mangler &Mang, - const TargetMachine &TM) const{ - assert(!Kind.isThreadLocal() && "Doesn't support TLS"); - - if (Kind.isText()) - return getTextSection(); - - if (Kind.isBSS() && BSSSection != nullptr) - return BSSSection; +bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection( + bool UsesLabelDifference, const Function &F) const { + // In PIC mode, we need to emit the jump table to the same section as the + // function body itself, otherwise the label differences won't make sense. + // FIXME: Need a better predicate for this: what about custom entries? + if (UsesLabelDifference) + return true; - if (Kind.isReadOnly() && ReadOnlySection != nullptr) - return ReadOnlySection; + // We should also do if the section name is NULL or function is declared + // in discardable section + // FIXME: this isn't the right predicate, should be based on the MCSection + // for the function. + if (F.isWeakForLinker()) + return true; - return getDataSection(); + return false; } -/// getSectionForConstant - Given a mergable constant with the -/// specified size and relocation information, return a section that it -/// should be placed in. -const MCSection * -TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const { +/// Given a mergable constant with the specified size and relocation +/// information, return a section that it should be placed in. +MCSection *TargetLoweringObjectFile::getSectionForConstant( + const DataLayout &DL, SectionKind Kind, const Constant *C) const { if (Kind.isReadOnly() && ReadOnlySection != nullptr) return ReadOnlySection; @@ -312,7 +292,7 @@ const MCExpr *TargetLoweringObjectFile::getTTypeGlobalReference( const TargetMachine &TM, MachineModuleInfo *MMI, MCStreamer &Streamer) const { const MCSymbolRefExpr *Ref = - MCSymbolRefExpr::Create(TM.getSymbol(GV, Mang), getContext()); + MCSymbolRefExpr::create(TM.getSymbol(GV, Mang), getContext()); return getTTypeReference(Ref, Encoding, Streamer); } @@ -329,10 +309,10 @@ getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding, case dwarf::DW_EH_PE_pcrel: { // Emit a label to the streamer for the current position. This gives us // .-foo addressing. - MCSymbol *PCSym = getContext().CreateTempSymbol(); + MCSymbol *PCSym = getContext().createTempSymbol(); Streamer.EmitLabel(PCSym); - const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, getContext()); - return MCBinaryExpr::CreateSub(Sym, PC, getContext()); + const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); + return MCBinaryExpr::createSub(Sym, PC, getContext()); } } } @@ -340,5 +320,11 @@ getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding, const MCExpr *TargetLoweringObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const { // FIXME: It's not clear what, if any, default this should have - perhaps a // null return could mean 'no location' & we should just do that here. - return MCSymbolRefExpr::Create(Sym, *Ctx); + return MCSymbolRefExpr::create(Sym, *Ctx); +} + +void TargetLoweringObjectFile::getNameWithPrefix( + SmallVectorImpl &OutName, const GlobalValue *GV, Mangler &Mang, + const TargetMachine &TM) const { + Mang.getNameWithPrefix(OutName, GV, /*CannotUsePrivateLabel=*/false); }