X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FWinCOFFStreamer.cpp;h=1d03e2d742f02366f47fcd0cd714387f201a5a17;hb=12af22e8cc217827cf4f118b0f5e4ebbda9925ae;hp=8a194bff215137b695b1136153b00fb7eff38071;hpb=bf252bef674985f8a4d2de713acf9280e4d8d10b;p=oota-llvm.git diff --git a/lib/MC/WinCOFFStreamer.cpp b/lib/MC/WinCOFFStreamer.cpp index 8a194bff215..1d03e2d742f 100644 --- a/lib/MC/WinCOFFStreamer.cpp +++ b/lib/MC/WinCOFFStreamer.cpp @@ -7,343 +7,247 @@ // //===----------------------------------------------------------------------===// // -// This file contains an implementation of a Win32 COFF object file streamer. +// This file contains an implementation of a Windows COFF object file streamer. // //===----------------------------------------------------------------------===// -#define DEBUG_TYPE "WinCOFFStreamer" - -#include "llvm/MC/MCObjectStreamer.h" +#include "llvm/ADT/StringExtras.h" +#include "llvm/MC/MCStreamer.h" +#include "llvm/MC/MCAsmBackend.h" +#include "llvm/MC/MCAsmLayout.h" +#include "llvm/MC/MCAssembler.h" +#include "llvm/MC/MCCodeEmitter.h" #include "llvm/MC/MCContext.h" +#include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCObjectFileInfo.h" +#include "llvm/MC/MCObjectStreamer.h" #include "llvm/MC/MCSection.h" +#include "llvm/MC/MCSectionCOFF.h" #include "llvm/MC/MCSymbol.h" -#include "llvm/MC/MCExpr.h" #include "llvm/MC/MCValue.h" -#include "llvm/MC/MCAssembler.h" -#include "llvm/MC/MCAsmLayout.h" -#include "llvm/MC/MCCodeEmitter.h" -#include "llvm/MC/MCSectionCOFF.h" -#include "llvm/Target/TargetRegistry.h" -#include "llvm/Target/TargetAsmBackend.h" -#include "llvm/ADT/StringMap.h" - +#include "llvm/MC/MCWinCOFFStreamer.h" #include "llvm/Support/COFF.h" #include "llvm/Support/Debug.h" #include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/TargetRegistry.h" #include "llvm/Support/raw_ostream.h" -using namespace llvm; - -namespace { -class WinCOFFStreamer : public MCObjectStreamer { -public: - MCSymbol const *CurSymbol; - - WinCOFFStreamer(MCContext &Context, - TargetAsmBackend &TAB, - MCCodeEmitter &CE, - raw_ostream &OS); - - void AddCommonSymbol(MCSymbol *Symbol, uint64_t Size, - unsigned ByteAlignment, bool External); - - // MCStreamer interface - - virtual void EmitLabel(MCSymbol *Symbol); - virtual void EmitAssemblerFlag(MCAssemblerFlag Flag); - virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value); - virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute); - virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue); - virtual void BeginCOFFSymbolDef(MCSymbol const *Symbol); - virtual void EmitCOFFSymbolStorageClass(int StorageClass); - virtual void EmitCOFFSymbolType(int Type); - virtual void EndCOFFSymbolDef(); - virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value); - virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, - unsigned ByteAlignment); - virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size); - virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol, - unsigned Size,unsigned ByteAlignment); - virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size, unsigned ByteAlignment); - virtual void EmitBytes(StringRef Data, unsigned AddrSpace); - virtual void EmitValue(const MCExpr *Value, unsigned Size, - unsigned AddrSpace); - virtual void EmitGPRel32Value(const MCExpr *Value); - virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value, - unsigned ValueSize, unsigned MaxBytesToEmit); - virtual void EmitCodeAlignment(unsigned ByteAlignment, - unsigned MaxBytesToEmit); - virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value); - virtual void EmitFileDirective(StringRef Filename); - virtual void EmitDwarfFileDirective(unsigned FileNo,StringRef Filename); - virtual void EmitInstruction(const MCInst &Instruction); - virtual void Finish(); -}; -} // end anonymous namespace. - -WinCOFFStreamer::WinCOFFStreamer(MCContext &Context, - TargetAsmBackend &TAB, - MCCodeEmitter &CE, - raw_ostream &OS) - : MCObjectStreamer(Context, TAB, OS, &CE) - , CurSymbol(NULL) { -} - -void WinCOFFStreamer::AddCommonSymbol(MCSymbol *Symbol, uint64_t Size, - unsigned ByteAlignment, bool External) { - assert(!Symbol->isInSection() && "Symbol must not already have a section!"); - std::string SectionName(".bss$linkonce"); - SectionName.append(Symbol->getName().begin(), Symbol->getName().end()); +using namespace llvm; - MCSymbolData &SymbolData = getAssembler().getOrCreateSymbolData(*Symbol); +#define DEBUG_TYPE "WinCOFFStreamer" - unsigned Characteristics = - COFF::IMAGE_SCN_LNK_COMDAT | - COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | - COFF::IMAGE_SCN_MEM_READ | - COFF::IMAGE_SCN_MEM_WRITE; +namespace llvm { +MCWinCOFFStreamer::MCWinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB, + MCCodeEmitter &CE, raw_ostream &OS) + : MCObjectStreamer(Context, MAB, OS, &CE), CurSymbol(nullptr) {} - int Selection = COFF::IMAGE_COMDAT_SELECT_LARGEST; +void MCWinCOFFStreamer::EmitInstToData(const MCInst &Inst, + const MCSubtargetInfo &STI) { + MCDataFragment *DF = getOrCreateDataFragment(); - const MCSection *Section = MCStreamer::getContext().getCOFFSection( - SectionName, Characteristics, Selection, SectionKind::getBSS()); + SmallVector Fixups; + SmallString<256> Code; + raw_svector_ostream VecOS(Code); + getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI); + VecOS.flush(); - MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section); + // Add the fixups and data. + for (unsigned i = 0, e = Fixups.size(); i != e; ++i) { + Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size()); + DF->getFixups().push_back(Fixups[i]); + } - if (SectionData.getAlignment() < ByteAlignment) - SectionData.setAlignment(ByteAlignment); + DF->getContents().append(Code.begin(), Code.end()); +} - SymbolData.setExternal(External); +void MCWinCOFFStreamer::InitSections() { + // FIXME: this is identical to the ELF one. + // This emulates the same behavior of GNU as. This makes it easier + // to compare the output as the major sections are in the same order. + SwitchSection(getContext().getObjectFileInfo()->getTextSection()); + EmitCodeAlignment(4); - Symbol->setSection(*Section); + SwitchSection(getContext().getObjectFileInfo()->getDataSection()); + EmitCodeAlignment(4); - if (ByteAlignment != 1) - new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData); + SwitchSection(getContext().getObjectFileInfo()->getBSSSection()); + EmitCodeAlignment(4); - SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData)); + SwitchSection(getContext().getObjectFileInfo()->getTextSection()); } -// MCStreamer interface - -void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) { - // TODO: This is copied almost exactly from the MachOStreamer. Consider - // merging into MCObjectStreamer? +void MCWinCOFFStreamer::EmitLabel(MCSymbol *Symbol) { assert(Symbol->isUndefined() && "Cannot define a symbol twice!"); - assert(!Symbol->isVariable() && "Cannot emit a variable symbol!"); - assert(CurSection && "Cannot emit before setting section!"); - - Symbol->setSection(*CurSection); - - MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); - - // FIXME: This is wasteful, we don't necessarily need to create a data - // fragment. Instead, we should mark the symbol as pointing into the data - // fragment if it exists, otherwise we should just queue the label and set its - // fragment pointer when we emit the next fragment. - MCDataFragment *DF = getOrCreateDataFragment(); - - assert(!SD.getFragment() && "Unexpected fragment on symbol data!"); - SD.setFragment(DF); - SD.setOffset(DF->getContents().size()); + MCObjectStreamer::EmitLabel(Symbol); } -void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) { +void MCWinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) { llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) { - // TODO: This is exactly the same as MachOStreamer. Consider merging into - // MCObjectStreamer. - getAssembler().getOrCreateSymbolData(*Symbol); - AddValueSymbols(Value); - Symbol->setVariableValue(Value); +void MCWinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) { + llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol, - MCSymbolAttr Attribute) { +bool MCWinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol, + MCSymbolAttr Attribute) { + assert(Symbol && "Symbol must be non-null!"); + assert((!Symbol->isInSection() || + Symbol->getSection().getVariant() == MCSection::SV_COFF) && + "Got non-COFF section in the COFF backend!"); + + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + switch (Attribute) { + default: return false; case MCSA_WeakReference: - getAssembler().getOrCreateSymbolData(*Symbol).modifyFlags( - COFF::SF_WeakReference, - COFF::SF_WeakReference); + case MCSA_Weak: + SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal); + SD.setExternal(true); break; - case MCSA_Global: - getAssembler().getOrCreateSymbolData(*Symbol).setExternal(true); - break; - - default: - llvm_unreachable("unsupported attribute"); + SD.setExternal(true); break; } + + return true; } -void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) { +void MCWinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) { llvm_unreachable("not implemented"); } -void WinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) { - assert(CurSymbol == NULL && "EndCOFFSymbolDef must be called between calls " - "to BeginCOFFSymbolDef!"); +void MCWinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) { + assert((!Symbol->isInSection() || + Symbol->getSection().getVariant() == MCSection::SV_COFF) && + "Got non-COFF section in the COFF backend!"); + + if (CurSymbol) + FatalError("starting a new symbol definition without completing the " + "previous one"); CurSymbol = Symbol; } -void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) { - assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); - assert((StorageClass & ~0xFF) == 0 && "StorageClass must only have data in " - "the first byte!"); +void MCWinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) { + if (!CurSymbol) + FatalError("storage class specified outside of symbol definition"); - getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags( - StorageClass << COFF::SF_ClassShift, - COFF::SF_ClassMask); + if (StorageClass & ~0xff) + FatalError(Twine("storage class value '") + itostr(StorageClass) + + "' out of range"); + + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol); + SD.modifyFlags(StorageClass << COFF::SF_ClassShift, COFF::SF_ClassMask); } -void WinCOFFStreamer::EmitCOFFSymbolType(int Type) { - assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); - assert((Type & ~0xFFFF) == 0 && "Type must only have data in the first 2 " - "bytes"); +void MCWinCOFFStreamer::EmitCOFFSymbolType(int Type) { + if (!CurSymbol) + FatalError("symbol type specified outside of a symbol definition"); - getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags( - Type << COFF::SF_TypeShift, - COFF::SF_TypeMask); -} + if (Type & ~0xffff) + FatalError(Twine("type value '") + itostr(Type) + "' out of range"); -void WinCOFFStreamer::EndCOFFSymbolDef() { - assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); - CurSymbol = NULL; + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol); + SD.modifyFlags(Type << COFF::SF_TypeShift, COFF::SF_TypeMask); } -void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) { - llvm_unreachable("not implemented"); +void MCWinCOFFStreamer::EndCOFFSymbolDef() { + if (!CurSymbol) + FatalError("ending symbol definition without starting one"); + CurSymbol = nullptr; } -void WinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, - unsigned ByteAlignment) { - AddCommonSymbol(Symbol, Size, ByteAlignment, true); +void MCWinCOFFStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) { + MCDataFragment *DF = getOrCreateDataFragment(); + const MCSymbolRefExpr *SRE = MCSymbolRefExpr::Create(Symbol, getContext()); + MCFixup Fixup = MCFixup::Create(DF->getContents().size(), SRE, FK_SecRel_2); + DF->getFixups().push_back(Fixup); + DF->getContents().resize(DF->getContents().size() + 4, 0); } -void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) { - AddCommonSymbol(Symbol, Size, 1, false); +void MCWinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) { + MCDataFragment *DF = getOrCreateDataFragment(); + const MCSymbolRefExpr *SRE = MCSymbolRefExpr::Create(Symbol, getContext()); + MCFixup Fixup = MCFixup::Create(DF->getContents().size(), SRE, FK_SecRel_4); + DF->getFixups().push_back(Fixup); + DF->getContents().resize(DF->getContents().size() + 4, 0); } -void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol, - unsigned Size,unsigned ByteAlignment) { - llvm_unreachable("not implemented"); +void MCWinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) { + llvm_unreachable("not supported"); } -void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size, unsigned ByteAlignment) { - llvm_unreachable("not implemented"); -} +void MCWinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) { + assert((!Symbol->isInSection() || + Symbol->getSection().getVariant() == MCSection::SV_COFF) && + "Got non-COFF section in the COFF backend!"); + + if (ByteAlignment > 32) + report_fatal_error("alignment is limited to 32-bytes"); -void WinCOFFStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) { - // TODO: This is copied exactly from the MachOStreamer. Consider merging into - // MCObjectStreamer? - getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end()); + AssignSection(Symbol, nullptr); + + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + SD.setExternal(true); + SD.setCommon(Size, ByteAlignment); } -void WinCOFFStreamer::EmitValue(const MCExpr *Value, unsigned Size, - unsigned AddrSpace) { - assert(AddrSpace == 0 && "Address space must be 0!"); +void MCWinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) { + assert(!Symbol->isInSection() && "Symbol must not already have a section!"); - // TODO: This is copied exactly from the MachOStreamer. Consider merging into - // MCObjectStreamer? - MCDataFragment *DF = getOrCreateDataFragment(); + const MCSection *Section = getContext().getObjectFileInfo()->getBSSSection(); + MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section); + if (SectionData.getAlignment() < ByteAlignment) + SectionData.setAlignment(ByteAlignment); - // Avoid fixups when possible. - int64_t AbsValue; - if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue)) { - // FIXME: Endianness assumption. - for (unsigned i = 0; i != Size; ++i) - DF->getContents().push_back(uint8_t(AbsValue >> (i * 8))); - } else { - DF->addFixup(MCFixup::Create(DF->getContents().size(), - AddValueSymbols(Value), - MCFixup::getKindForSize(Size))); - DF->getContents().resize(DF->getContents().size() + Size, 0); - } -} + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + SD.setExternal(false); -void WinCOFFStreamer::EmitGPRel32Value(const MCExpr *Value) { - llvm_unreachable("not implemented"); -} + AssignSection(Symbol, Section); -void WinCOFFStreamer::EmitValueToAlignment(unsigned ByteAlignment, - int64_t Value, - unsigned ValueSize, - unsigned MaxBytesToEmit) { - // TODO: This is copied exactly from the MachOStreamer. Consider merging into - // MCObjectStreamer? - if (MaxBytesToEmit == 0) - MaxBytesToEmit = ByteAlignment; - new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit, - getCurrentSectionData()); - - // Update the maximum alignment on the current section if necessary. - if (ByteAlignment > getCurrentSectionData()->getAlignment()) - getCurrentSectionData()->setAlignment(ByteAlignment); + if (ByteAlignment != 1) + new MCAlignFragment(ByteAlignment, /*_Value=*/0, /*_ValueSize=*/0, + ByteAlignment, &SectionData); + + MCFillFragment *Fragment = + new MCFillFragment(/*_Value=*/0, /*_ValueSize=*/0, Size, &SectionData); + SD.setFragment(Fragment); } -void WinCOFFStreamer::EmitCodeAlignment(unsigned ByteAlignment, - unsigned MaxBytesToEmit) { - // TODO: This is copied exactly from the MachOStreamer. Consider merging into - // MCObjectStreamer? - if (MaxBytesToEmit == 0) - MaxBytesToEmit = ByteAlignment; - MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit, - getCurrentSectionData()); - F->setEmitNops(true); - - // Update the maximum alignment on the current section if necessary. - if (ByteAlignment > getCurrentSectionData()->getAlignment()) - getCurrentSectionData()->setAlignment(ByteAlignment); +void MCWinCOFFStreamer::EmitZerofill(const MCSection *Section, + MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) { + llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitValueToOffset(const MCExpr *Offset, - unsigned char Value) { +void MCWinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, + MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) { llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitFileDirective(StringRef Filename) { - // Ignore for now, linkers don't care, and proper debug - // info will be a much large effort. +void MCWinCOFFStreamer::EmitFileDirective(StringRef Filename) { + getAssembler().addFileName(Filename); } -void WinCOFFStreamer::EmitDwarfFileDirective(unsigned FileNo, - StringRef Filename) { +// TODO: Implement this if you want to emit .comment section in COFF obj files. +void MCWinCOFFStreamer::EmitIdent(StringRef IdentString) { llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitInstruction(const MCInst &Instruction) { - for (unsigned i = 0, e = Instruction.getNumOperands(); i != e; ++i) - if (Instruction.getOperand(i).isExpr()) - AddValueSymbols(Instruction.getOperand(i).getExpr()); - - getCurrentSectionData()->setHasInstructions(true); - - MCInstFragment *Fragment = - new MCInstFragment(Instruction, getCurrentSectionData()); - - raw_svector_ostream VecOS(Fragment->getCode()); - - getAssembler().getEmitter().EncodeInstruction(Instruction, VecOS, - Fragment->getFixups()); +void MCWinCOFFStreamer::EmitWinEHHandlerData() { + llvm_unreachable("not implemented"); } -void WinCOFFStreamer::Finish() { - MCObjectStreamer::Finish(); +void MCWinCOFFStreamer::FinishImpl() { + MCObjectStreamer::FinishImpl(); } -namespace llvm -{ - MCStreamer *createWinCOFFStreamer(MCContext &Context, - TargetAsmBackend &TAB, - MCCodeEmitter &CE, - raw_ostream &OS, - bool RelaxAll) { - WinCOFFStreamer *S = new WinCOFFStreamer(Context, TAB, CE, OS); - S->getAssembler().setRelaxAll(RelaxAll); - return S; - } +LLVM_ATTRIBUTE_NORETURN +void MCWinCOFFStreamer::FatalError(const Twine &Msg) const { + getContext().FatalError(SMLoc(), Msg); } +} +