diff options
Diffstat (limited to 'lib/MC/WinCOFFStreamer.cpp')
| -rw-r--r-- | lib/MC/WinCOFFStreamer.cpp | 313 |
1 files changed, 134 insertions, 179 deletions
diff --git a/lib/MC/WinCOFFStreamer.cpp b/lib/MC/WinCOFFStreamer.cpp index 5bd7b8f..e6df465 100644 --- a/lib/MC/WinCOFFStreamer.cpp +++ b/lib/MC/WinCOFFStreamer.cpp @@ -7,12 +7,11 @@ // //===----------------------------------------------------------------------===// // -// 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/ADT/StringExtras.h" #include "llvm/MC/MCStreamer.h" #include "llvm/MC/MCAsmBackend.h" #include "llvm/MC/MCAsmLayout.h" @@ -27,6 +26,7 @@ #include "llvm/MC/MCSymbol.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" @@ -35,95 +35,33 @@ 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 - - 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<MCFixup, 4> 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, 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!"); +#define DEBUG_TYPE "WinCOFFStreamer" - const MCSection *Section = getContext().getObjectFileInfo()->getBSSSection(); - MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section); - if (SectionData.getAlignment() < ByteAlignment) - SectionData.setAlignment(ByteAlignment); +namespace llvm { +MCWinCOFFStreamer::MCWinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB, + MCCodeEmitter &CE, raw_ostream &OS) + : MCObjectStreamer(Context, MAB, OS, &CE), CurSymbol(nullptr) {} - MCSymbolData &SymbolData = getAssembler().getOrCreateSymbolData(*Symbol); - SymbolData.setExternal(External); +void MCWinCOFFStreamer::EmitInstToData(const MCInst &Inst, + const MCSubtargetInfo &STI) { + MCDataFragment *DF = getOrCreateDataFragment(); - AssignSection(Symbol, Section); + SmallVector<MCFixup, 4> Fixups; + SmallString<256> Code; + raw_svector_ostream VecOS(Code); + getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI); + VecOS.flush(); - if (ByteAlignment != 1) - new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData); + // 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]); + } - SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData)); + DF->getContents().append(Code.begin(), Code.end()); } -// MCStreamer interface - -void WinCOFFStreamer::InitSections() { +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. @@ -139,165 +77,182 @@ void WinCOFFStreamer::InitSections() { 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) { +void MCWinCOFFStreamer::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"); } -bool 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!"); + + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*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: + SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal); + SD.setExternal(true); break; - case MCSA_Global: - getAssembler().getOrCreateSymbolData(*Symbol).setExternal(true); + SD.setExternal(true); break; - - default: - return false; } 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 & ~0xff) + FatalError(Twine("storage class value '") + itostr(StorageClass) + + "' out of range"); - getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags( - StorageClass << COFF::SF_ClassShift, - COFF::SF_ClassMask); + 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"); + + if (Type & ~0xffff) + FatalError(Twine("type value '") + itostr(Type) + "' out of range"); - getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags( - Type << COFF::SF_TypeShift, - COFF::SF_TypeMask); + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol); + SD.modifyFlags(Type << COFF::SF_TypeShift, COFF::SF_TypeMask); } -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::EmitCOFFSectionIndex(MCSymbol const *Symbol) { +void MCWinCOFFStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) { MCDataFragment *DF = getOrCreateDataFragment(); - DF->getFixups().push_back(MCFixup::Create( - DF->getContents().size(), MCSymbolRefExpr::Create(Symbol, getContext()), - FK_SecRel_2)); + 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::EmitCOFFSecRel32(MCSymbol const *Symbol) { +void MCWinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) { MCDataFragment *DF = getOrCreateDataFragment(); - DF->getFixups().push_back(MCFixup::Create( - DF->getContents().size(), MCSymbolRefExpr::Create(Symbol, getContext()), - FK_SecRel_4)); + 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::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) { + llvm_unreachable("not supported"); } -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); +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"); + + AssignSection(Symbol, nullptr); + + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + SD.setExternal(true); + SD.setCommon(Size, ByteAlignment); } -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!"); + + const MCSection *Section = getContext().getObjectFileInfo()->getBSSSection(); + MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section); + if (SectionData.getAlignment() < ByteAlignment) + SectionData.setAlignment(ByteAlignment); + + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + SD.setExternal(false); + + AssignSection(Symbol, Section); + + 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::EmitZerofill(const MCSection *Section, MCSymbol *Symbol, - uint64_t Size,unsigned ByteAlignment) { +void MCWinCOFFStreamer::EmitZerofill(const 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(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); } // TODO: Implement this if you want to emit .comment section in COFF obj files. -void WinCOFFStreamer::EmitIdent(StringRef IdentString) { - llvm_unreachable("unsupported directive"); +void MCWinCOFFStreamer::EmitIdent(StringRef IdentString) { + llvm_unreachable("not implemented"); } -void WinCOFFStreamer::EmitWin64EHHandlerData() { - MCStreamer::EmitWin64EHHandlerData(); - - // We have to emit the unwind info now, because this directive - // actually switches to the .xdata section! - MCWin64EHUnwindEmitter::EmitUnwindInfo(*this, getCurrentW64UnwindInfo()); +void MCWinCOFFStreamer::EmitWin64EHHandlerData() { + llvm_unreachable("not implemented"); } -void WinCOFFStreamer::FinishImpl() { - EmitFrames(NULL, true); - 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().FatalError(SMLoc(), Msg); +} } + |