X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=lib%2FMC%2FWinCOFFStreamer.cpp;h=9f033d415dd84e9588d3af0b58f906805a8cb9f9;hb=c0bbe8259cd61e83921e007464ac2f88f3f1f44b;hp=a42d7b46e53fcbca4dad3c206441727ea4e0e600;hpb=86c3647ddfa8c39ed5d9eba9f2547544270c7bde;p=oota-llvm.git diff --git a/lib/MC/WinCOFFStreamer.cpp b/lib/MC/WinCOFFStreamer.cpp index a42d7b46e53..9f033d415dd 100644 --- a/lib/MC/WinCOFFStreamer.cpp +++ b/lib/MC/WinCOFFStreamer.cpp @@ -13,24 +13,26 @@ #define DEBUG_TYPE "WinCOFFStreamer" -#include "llvm/MC/MCObjectStreamer.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/MCWin64EH.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 { @@ -39,169 +41,110 @@ public: MCSymbol const *CurSymbol; WinCOFFStreamer(MCContext &Context, - TargetAsmBackend &TAB, + MCAsmBackend &MAB, MCCodeEmitter &CE, raw_ostream &OS); - void AddCommonSymbol(MCSymbol *Symbol, uint64_t Size, - unsigned ByteAlignment, bool External); - // MCStreamer interface - virtual void InitSections(); - 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(); + void InitSections() override; + void EmitLabel(MCSymbol *Symbol) override; + void EmitDebugLabel(MCSymbol *Symbol) override; + void EmitAssemblerFlag(MCAssemblerFlag Flag) override; + void EmitThumbFunc(MCSymbol *Func) override; + bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override; + void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override; + void BeginCOFFSymbolDef(MCSymbol const *Symbol) override; + void EmitCOFFSymbolStorageClass(int StorageClass) override; + void EmitCOFFSymbolType(int Type) override; + void EndCOFFSymbolDef() override; + void EmitCOFFSectionIndex(MCSymbol const *Symbol) override; + void EmitCOFFSecRel32(MCSymbol const *Symbol) override; + void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override; + void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) override; + void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) override; + void EmitZerofill(const MCSection *Section, MCSymbol *Symbol, + uint64_t Size,unsigned ByteAlignment) override; + void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, + uint64_t Size, unsigned ByteAlignment) override; + void EmitFileDirective(StringRef Filename) override; + void EmitIdent(StringRef IdentString) override; + void EmitWin64EHHandlerData() override; + void FinishImpl() override; + +private: + void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override { + MCDataFragment *DF = getOrCreateDataFragment(); + + SmallVector Fixups; + SmallString<256> Code; + raw_svector_ostream VecOS(Code); + getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI); + VecOS.flush(); + + // 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]); + } + DF->getContents().append(Code.begin(), Code.end()); + } }; } // end anonymous namespace. -WinCOFFStreamer::WinCOFFStreamer(MCContext &Context, - TargetAsmBackend &TAB, - MCCodeEmitter &CE, - raw_ostream &OS) - : MCObjectStreamer(Context, TAB, OS, &CE, true) - , 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()); - - MCSymbolData &SymbolData = getAssembler().getOrCreateSymbolData(*Symbol); +WinCOFFStreamer::WinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB, + MCCodeEmitter &CE, raw_ostream &OS) + : MCObjectStreamer(Context, MAB, OS, &CE), CurSymbol(nullptr) {} - unsigned Characteristics = - COFF::IMAGE_SCN_LNK_COMDAT | - COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | - COFF::IMAGE_SCN_MEM_READ | - COFF::IMAGE_SCN_MEM_WRITE; - - int Selection = COFF::IMAGE_COMDAT_SELECT_LARGEST; - - const MCSection *Section = MCStreamer::getContext().getCOFFSection( - SectionName, Characteristics, Selection, SectionKind::getBSS()); - - MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section); - - if (SectionData.getAlignment() < ByteAlignment) - SectionData.setAlignment(ByteAlignment); - - SymbolData.setExternal(External); - - Symbol->setSection(*Section); +// MCStreamer interface - if (ByteAlignment != 1) - new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData); +void WinCOFFStreamer::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); - SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData)); -} + SwitchSection(getContext().getObjectFileInfo()->getDataSection()); + EmitCodeAlignment(4); -// MCStreamer interface + SwitchSection(getContext().getObjectFileInfo()->getBSSSection()); + EmitCodeAlignment(4); -void WinCOFFStreamer::InitSections() { + SwitchSection(getContext().getObjectFileInfo()->getTextSection()); } void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) { - // TODO: This is copied almost exactly from the MachOStreamer. Consider - // merging into MCObjectStreamer? 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::EmitDebugLabel(MCSymbol *Symbol) { + EmitLabel(Symbol); +} void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) { llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) { - // FIXME: This is all very ugly and depressing. What needs to happen here - // depends on quite a few things that are all part of relaxation, which we - // don't really even do. - - if (Value->getKind() != MCExpr::SymbolRef) { - // TODO: This is exactly the same as MachOStreamer. Consider merging into - // MCObjectStreamer. - getAssembler().getOrCreateSymbolData(*Symbol); - AddValueSymbols(Value); - Symbol->setVariableValue(Value); - } else { - // FIXME: This is a horrible way to do this :(. This should really be - // handled after we are done with the MC* objects and immediately before - // writing out the object file when we know exactly what the symbol should - // look like in the coff symbol table. I'm not doing that now because the - // COFF object writer doesn't have a clearly defined separation between MC - // data structures, the object writers data structures, and the raw, POD, - // data structures that get written to disk. - - // Copy over the aliased data. - MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); - const MCSymbolData &RealSD = getAssembler().getOrCreateSymbolData( - dyn_cast(Value)->getSymbol()); - - // FIXME: This is particularly nasty because it breaks as soon as any data - // members of MCSymbolData change. - SD.CommonAlign = RealSD.CommonAlign; - SD.CommonSize = RealSD.CommonSize; - SD.Flags = RealSD.Flags; - SD.Fragment = RealSD.Fragment; - SD.Index = RealSD.Index; - SD.IsExternal = RealSD.IsExternal; - SD.IsPrivateExtern = RealSD.IsPrivateExtern; - SD.Offset = RealSD.Offset; - SD.SymbolSize = RealSD.SymbolSize; - } +void WinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) { + llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol, +bool WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) { + assert(Symbol && "Symbol must be non-null!"); + assert((Symbol->isInSection() + ? Symbol->getSection().getVariant() == MCSection::SV_COFF + : true) && "Got non-COFF section in the COFF backend!"); switch (Attribute) { case MCSA_WeakReference: - getAssembler().getOrCreateSymbolData(*Symbol).modifyFlags( - COFF::SF_WeakReference, - COFF::SF_WeakReference); + case MCSA_Weak: { + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal); + SD.setExternal(true); + } break; case MCSA_Global: @@ -209,9 +152,10 @@ void WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol, break; default: - llvm_unreachable("unsupported attribute"); - break; + return false; } + + return true; } void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) { @@ -219,13 +163,16 @@ void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) { } void WinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) { - assert(CurSymbol == NULL && "EndCOFFSymbolDef must be called between calls " - "to BeginCOFFSymbolDef!"); + assert((Symbol->isInSection() + ? Symbol->getSection().getVariant() == MCSection::SV_COFF + : true) && "Got non-COFF section in the COFF backend!"); + assert(!CurSymbol && "EndCOFFSymbolDef must be called between calls " + "to BeginCOFFSymbolDef!"); CurSymbol = Symbol; } void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) { - assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); + assert(CurSymbol && "BeginCOFFSymbolDef must be called first!"); assert((StorageClass & ~0xFF) == 0 && "StorageClass must only have data in " "the first byte!"); @@ -235,7 +182,7 @@ void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) { } void WinCOFFStreamer::EmitCOFFSymbolType(int Type) { - assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); + assert(CurSymbol && "BeginCOFFSymbolDef must be called first!"); assert((Type & ~0xFFFF) == 0 && "Type must only have data in the first 2 " "bytes"); @@ -245,8 +192,24 @@ void WinCOFFStreamer::EmitCOFFSymbolType(int Type) { } void WinCOFFStreamer::EndCOFFSymbolDef() { - assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); - CurSymbol = NULL; + assert(CurSymbol && "BeginCOFFSymbolDef must be called first!"); + CurSymbol = nullptr; +} + +void WinCOFFStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) { + MCDataFragment *DF = getOrCreateDataFragment(); + DF->getFixups().push_back(MCFixup::Create( + DF->getContents().size(), MCSymbolRefExpr::Create(Symbol, getContext()), + FK_SecRel_2)); + DF->getContents().resize(DF->getContents().size() + 4, 0); +} + +void WinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) { + MCDataFragment *DF = getOrCreateDataFragment(); + DF->getFixups().push_back(MCFixup::Create( + DF->getContents().size(), MCSymbolRefExpr::Create(Symbol, getContext()), + FK_SecRel_4)); + DF->getContents().resize(DF->getContents().size() + 4, 0); } void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) { @@ -255,129 +218,84 @@ void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) { void WinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, unsigned ByteAlignment) { - AddCommonSymbol(Symbol, Size, ByteAlignment, true); -} + assert((Symbol->isInSection() + ? Symbol->getSection().getVariant() == MCSection::SV_COFF + : true) && "Got non-COFF section in the COFF backend!"); -void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) { - AddCommonSymbol(Symbol, Size, 1, false); -} + if (ByteAlignment > 32) + report_fatal_error( + "The linker won't align common symbols beyond 32 bytes."); -void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol, - unsigned Size,unsigned ByteAlignment) { - llvm_unreachable("not implemented"); -} + AssignSection(Symbol, nullptr); -void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size, unsigned ByteAlignment) { - llvm_unreachable("not implemented"); + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + SD.setExternal(true); + SD.setCommon(Size, ByteAlignment); } -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()); -} +void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) { + assert(!Symbol->isInSection() && "Symbol must not already have a section!"); -void WinCOFFStreamer::EmitValue(const MCExpr *Value, unsigned Size, - unsigned AddrSpace) { - assert(AddrSpace == 0 && "Address space must be 0!"); + const MCSection *Section = getContext().getObjectFileInfo()->getBSSSection(); + MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section); + if (SectionData.getAlignment() < ByteAlignment) + SectionData.setAlignment(ByteAlignment); - // TODO: This is copied exactly from the MachOStreamer. Consider merging into - // MCObjectStreamer? - MCDataFragment *DF = getOrCreateDataFragment(); + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + SD.setExternal(false); - // 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); - } -} + AssignSection(Symbol, Section); -void WinCOFFStreamer::EmitGPRel32Value(const MCExpr *Value) { - llvm_unreachable("not implemented"); -} + if (ByteAlignment != 1) + new MCAlignFragment(ByteAlignment, /*_Value=*/0, /*_ValueSize=*/0, + ByteAlignment, &SectionData); -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); + SD.setFragment( + new MCFillFragment(/*_Value=*/0, /*_ValueSize=*/0, Size, &SectionData)); } -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 WinCOFFStreamer::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 WinCOFFStreamer::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. + getAssembler().addFileName(Filename); } -void WinCOFFStreamer::EmitDwarfFileDirective(unsigned FileNo, - StringRef Filename) { - llvm_unreachable("not implemented"); +// TODO: Implement this if you want to emit .comment section in COFF obj files. +void WinCOFFStreamer::EmitIdent(StringRef IdentString) { + llvm_unreachable("unsupported directive"); } -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()); +void WinCOFFStreamer::EmitWin64EHHandlerData() { + MCStreamer::EmitWin64EHHandlerData(); - getAssembler().getEmitter().EncodeInstruction(Instruction, VecOS, - Fragment->getFixups()); + // We have to emit the unwind info now, because this directive + // actually switches to the .xdata section! + MCWin64EHUnwindEmitter::EmitUnwindInfo(*this, getCurrentW64UnwindInfo()); } -void WinCOFFStreamer::Finish() { - MCObjectStreamer::Finish(); +void WinCOFFStreamer::FinishImpl() { + EmitFrames(nullptr, true); + EmitW64Tables(); + MCObjectStreamer::FinishImpl(); } namespace llvm { MCStreamer *createWinCOFFStreamer(MCContext &Context, - TargetAsmBackend &TAB, + MCAsmBackend &MAB, MCCodeEmitter &CE, raw_ostream &OS, bool RelaxAll) { - WinCOFFStreamer *S = new WinCOFFStreamer(Context, TAB, CE, OS); + WinCOFFStreamer *S = new WinCOFFStreamer(Context, MAB, CE, OS); S->getAssembler().setRelaxAll(RelaxAll); return S; }