X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FWinCOFFStreamer.cpp;h=40c242ce86651b8391a9f4013de65fa71688d287;hb=ac4ccbae9f921897fd2fda9ecfbfef4479dadb8d;hp=b529489b1a6a736c8602c0a75d75026162693367;hpb=0933134a304b47d3767aad202df9f0e09743da6d;p=oota-llvm.git diff --git a/lib/MC/WinCOFFStreamer.cpp b/lib/MC/WinCOFFStreamer.cpp index b529489b1a6..40c242ce866 100644 --- a/lib/MC/WinCOFFStreamer.cpp +++ b/lib/MC/WinCOFFStreamer.cpp @@ -7,329 +7,285 @@ // //===----------------------------------------------------------------------===// // -// 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/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/MCStreamer.h" +#include "llvm/MC/MCSymbolCOFF.h" #include "llvm/MC/MCValue.h" -#include "llvm/MC/MCWin64EH.h" +#include "llvm/MC/MCWinCOFFStreamer.h" #include "llvm/Support/COFF.h" #include "llvm/Support/Debug.h" #include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/MathExtras.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, - 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 InitToTextSection(); - virtual void EmitLabel(MCSymbol *Symbol); - virtual void EmitDebugLabel(MCSymbol *Symbol); - virtual void EmitAssemblerFlag(MCAssemblerFlag Flag); - virtual void EmitThumbFunc(MCSymbol *Func); - 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 EmitCOFFSecRel32(MCSymbol const *Symbol); - 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, - unsigned ByteAlignment); - virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size,unsigned ByteAlignment); - virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size, unsigned ByteAlignment); - virtual void EmitFileDirective(StringRef Filename); - virtual void EmitWin64EHHandlerData(); - virtual void FinishImpl(); - -private: - virtual void EmitInstToData(const MCInst &Inst) { - MCDataFragment *DF = getOrCreateDataFragment(); - - SmallVector Fixups; - SmallString<256> Code; - raw_svector_ostream VecOS(Code); - getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups); - 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()); - } +#define DEBUG_TYPE "WinCOFFStreamer" - void SetSection(StringRef Section, - unsigned Characteristics, - SectionKind Kind) { - SwitchSection(getContext().getCOFFSection(Section, Characteristics, Kind)); - } +namespace llvm { +MCWinCOFFStreamer::MCWinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB, + MCCodeEmitter &CE, raw_pwrite_stream &OS) + : MCObjectStreamer(Context, MAB, OS, &CE), CurSymbol(nullptr) {} - void SetSectionText() { - SetSection(".text", - COFF::IMAGE_SCN_CNT_CODE - | COFF::IMAGE_SCN_MEM_EXECUTE - | COFF::IMAGE_SCN_MEM_READ, - SectionKind::getText()); - EmitCodeAlignment(4, 0); - } +void MCWinCOFFStreamer::EmitInstToData(const MCInst &Inst, + const MCSubtargetInfo &STI) { + MCDataFragment *DF = getOrCreateDataFragment(); - void SetSectionData() { - SetSection(".data", - COFF::IMAGE_SCN_CNT_INITIALIZED_DATA - | COFF::IMAGE_SCN_MEM_READ - | COFF::IMAGE_SCN_MEM_WRITE, - SectionKind::getDataRel()); - EmitCodeAlignment(4, 0); - } + SmallVector Fixups; + SmallString<256> Code; + raw_svector_ostream VecOS(Code); + getAssembler().getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI); - void SetSectionBSS() { - SetSection(".bss", - COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA - | COFF::IMAGE_SCN_MEM_READ - | COFF::IMAGE_SCN_MEM_WRITE, - SectionKind::getBSS()); - EmitCodeAlignment(4, 0); + // 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]); } -}; -} // end anonymous namespace. - -WinCOFFStreamer::WinCOFFStreamer(MCContext &Context, - MCAsmBackend &MAB, - MCCodeEmitter &CE, - raw_ostream &OS) - : MCObjectStreamer(Context, MAB, 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()); - - MCSymbolData &SymbolData = getAssembler().getOrCreateSymbolData(*Symbol); - - 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); - - if (ByteAlignment != 1) - new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData); - - SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData)); + DF->getContents().append(Code.begin(), Code.end()); } -// MCStreamer interface +void MCWinCOFFStreamer::InitSections(bool NoExecStack) { + // 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); -void WinCOFFStreamer::InitToTextSection() { - SetSectionText(); -} + SwitchSection(getContext().getObjectFileInfo()->getDataSection()); + EmitCodeAlignment(4); + + SwitchSection(getContext().getObjectFileInfo()->getBSSSection()); + EmitCodeAlignment(4); -void WinCOFFStreamer::InitSections() { - SetSectionText(); - SetSectionData(); - SetSectionBSS(); - SetSectionText(); + SwitchSection(getContext().getObjectFileInfo()->getTextSection()); } -void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) { +void MCWinCOFFStreamer::EmitLabel(MCSymbol *Symbol) { assert(Symbol->isUndefined() && "Cannot define a symbol twice!"); MCObjectStreamer::EmitLabel(Symbol); } -void WinCOFFStreamer::EmitDebugLabel(MCSymbol *Symbol) { - EmitLabel(Symbol); -} -void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) { +void MCWinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) { llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) { +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 - : true) && "Got non COFF section in the COFF backend!"); + assert((!Symbol->isInSection() || + Symbol->getSection().getVariant() == MCSection::SV_COFF) && + "Got non-COFF section in the COFF backend!"); + + getAssembler().registerSymbol(*Symbol); + switch (Attribute) { + default: return false; case MCSA_WeakReference: - case MCSA_Weak: { - MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); - SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal); - SD.setExternal(true); - } + case MCSA_Weak: + cast(Symbol)->setIsWeakExternal(); + Symbol->setExternal(true); break; - case MCSA_Global: - getAssembler().getOrCreateSymbolData(*Symbol).setExternal(true); + Symbol->setExternal(true); break; - - default: - llvm_unreachable("unsupported attribute"); } + + 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((Symbol->isInSection() - ? Symbol->getSection().getVariant() == MCSection::SV_COFF - : true) && "Got non COFF section in the COFF backend!"); - 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"); + + if (StorageClass & ~COFF::SSC_Invalid) + FatalError("storage class value '" + Twine(StorageClass) + + "' out of range"); - getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags( - StorageClass << COFF::SF_ClassShift, - COFF::SF_ClassMask); + getAssembler().registerSymbol(*CurSymbol); + cast(CurSymbol)->setClass((uint16_t)StorageClass); } -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("type value '" + Twine(Type) + "' out of range"); + + getAssembler().registerSymbol(*CurSymbol); + cast(CurSymbol)->setType((uint16_t)Type); } -void WinCOFFStreamer::EndCOFFSymbolDef() { - assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); - CurSymbol = NULL; +void MCWinCOFFStreamer::EndCOFFSymbolDef() { + if (!CurSymbol) + FatalError("ending symbol definition without starting one"); + CurSymbol = nullptr; } -void WinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) -{ +void MCWinCOFFStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) { + // SafeSEH is a feature specific to 32-bit x86. It does not exist (and is + // unnecessary) on all platforms which use table-based exception dispatch. + if (getContext().getObjectFileInfo()->getTargetTriple().getArch() != + Triple::x86) + return; + + const MCSymbolCOFF *CSymbol = cast(Symbol); + if (CSymbol->isSafeSEH()) + return; + + MCSection *SXData = getContext().getObjectFileInfo()->getSXDataSection(); + getAssembler().registerSection(*SXData); + if (SXData->getAlignment() < 4) + SXData->setAlignment(4); + + new MCSafeSEHFragment(Symbol, SXData); + + getAssembler().registerSymbol(*Symbol); + CSymbol->setIsSafeSEH(); + + // The Microsoft linker requires that the symbol type of a handler be + // function. Go ahead and oblige it here. + CSymbol->setType(COFF::IMAGE_SYM_DTYPE_FUNCTION + << COFF::SCT_COMPLEX_TYPE_SHIFT); +} + +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() + 2, 0); +} - DF->getFixups().push_back( - MCFixup::Create(DF->getContents().size(), - MCSymbolRefExpr::Create (Symbol, getContext ()), - FK_SecRel_4)); +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::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) { - 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!"); + + const Triple &T = getContext().getObjectFileInfo()->getTargetTriple(); + if (T.isKnownWindowsMSVCEnvironment()) { + if (ByteAlignment > 32) + report_fatal_error("alignment is limited to 32-bytes"); + + // Round size up to alignment so that we will honor the alignment request. + Size = std::max(Size, static_cast(ByteAlignment)); + } + + getAssembler().registerSymbol(*Symbol); + Symbol->setExternal(true); + Symbol->setCommon(Size, ByteAlignment); + + if (!T.isKnownWindowsMSVCEnvironment() && ByteAlignment > 1) { + SmallString<128> Directive; + raw_svector_ostream OS(Directive); + const MCObjectFileInfo *MFI = getContext().getObjectFileInfo(); -void WinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, - unsigned ByteAlignment) { - assert((Symbol->isInSection() - ? Symbol->getSection().getVariant() == MCSection::SV_COFF - : true) && "Got non COFF section in the COFF backend!"); - AddCommonSymbol(Symbol, Size, ByteAlignment, true); + OS << " -aligncomm:\"" << Symbol->getName() << "\"," + << Log2_32_Ceil(ByteAlignment); + + PushSection(); + SwitchSection(MFI->getDrectveSection()); + EmitBytes(Directive); + PopSection(); + } } -void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, - unsigned ByteAlignment) { - assert((Symbol->isInSection() - ? Symbol->getSection().getVariant() == MCSection::SV_COFF - : true) && "Got non COFF section in the COFF backend!"); - AddCommonSymbol(Symbol, Size, ByteAlignment, false); +void MCWinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) { + assert(!Symbol->isInSection() && "Symbol must not already have a section!"); + + MCSection *Section = getContext().getObjectFileInfo()->getBSSSection(); + getAssembler().registerSection(*Section); + if (Section->getAlignment() < ByteAlignment) + Section->setAlignment(ByteAlignment); + + getAssembler().registerSymbol(*Symbol); + Symbol->setExternal(false); + + AssignSection(Symbol, Section); + + if (ByteAlignment != 1) + new MCAlignFragment(ByteAlignment, /*Value=*/0, /*ValueSize=*/0, + ByteAlignment, Section); + + MCFillFragment *Fragment = new MCFillFragment( + /*Value=*/0, /*ValueSize=*/0, Size, Section); + Symbol->setFragment(Fragment); } -void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size,unsigned ByteAlignment) { +void MCWinCOFFStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol, + uint64_t Size, unsigned ByteAlignment) { llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size, unsigned ByteAlignment) { +void MCWinCOFFStreamer::EmitTBSSSymbol(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::EmitWin64EHHandlerData() { - MCStreamer::EmitWin64EHHandlerData(); +// TODO: Implement this if you want to emit .comment section in COFF obj files. +void MCWinCOFFStreamer::EmitIdent(StringRef IdentString) { + llvm_unreachable("not implemented"); +} - // We have to emit the unwind info now, because this directive - // actually switches to the .xdata section! - MCWin64EHUnwindEmitter::EmitUnwindInfo(*this, getCurrentW64UnwindInfo()); +void MCWinCOFFStreamer::EmitWinEHHandlerData() { + llvm_unreachable("not implemented"); } -void WinCOFFStreamer::FinishImpl() { - EmitW64Tables(); +void MCWinCOFFStreamer::FinishImpl() { MCObjectStreamer::FinishImpl(); } -namespace llvm -{ - MCStreamer *createWinCOFFStreamer(MCContext &Context, - MCAsmBackend &MAB, - MCCodeEmitter &CE, - raw_ostream &OS, - bool RelaxAll) { - WinCOFFStreamer *S = new WinCOFFStreamer(Context, MAB, CE, OS); - S->getAssembler().setRelaxAll(RelaxAll); - return S; - } +LLVM_ATTRIBUTE_NORETURN +void MCWinCOFFStreamer::FatalError(const Twine &Msg) const { + getContext().reportFatalError(SMLoc(), Msg); } +} +