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Diffstat (limited to 'contrib/llvm/lib/MC/WinCOFFStreamer.cpp')
| -rw-r--r-- | contrib/llvm/lib/MC/WinCOFFStreamer.cpp | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/contrib/llvm/lib/MC/WinCOFFStreamer.cpp b/contrib/llvm/lib/MC/WinCOFFStreamer.cpp new file mode 100644 index 0000000..46968e6 --- /dev/null +++ b/contrib/llvm/lib/MC/WinCOFFStreamer.cpp @@ -0,0 +1,395 @@ +//===-- llvm/MC/WinCOFFStreamer.cpp -----------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file contains an implementation of a Win32 COFF object file streamer. +// +//===----------------------------------------------------------------------===// + +#define DEBUG_TYPE "WinCOFFStreamer" + +#include "llvm/MC/MCObjectStreamer.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/MCSection.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/Support/COFF.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.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 InitSections(); + virtual void EmitLabel(MCSymbol *Symbol); + virtual void EmitAssemblerFlag(MCAssemblerFlag Flag); + virtual void EmitThumbFunc(MCSymbol *Func); + 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 EmitValueToAlignment(unsigned ByteAlignment, int64_t Value, + unsigned ValueSize, unsigned MaxBytesToEmit); + virtual void EmitCodeAlignment(unsigned ByteAlignment, + unsigned MaxBytesToEmit); + virtual void EmitFileDirective(StringRef Filename); + virtual void EmitInstruction(const MCInst &Instruction); + virtual void Finish(); + +private: + virtual void EmitInstToFragment(const MCInst &Inst) { + llvm_unreachable("Not used by WinCOFF."); + } + virtual void EmitInstToData(const MCInst &Inst) { + llvm_unreachable("Not used by WinCOFF."); + } + + void SetSection(StringRef Section, + unsigned Characteristics, + SectionKind Kind) { + SwitchSection(getContext().getCOFFSection(Section, Characteristics, Kind)); + } + + 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 SetSectionData() { + SetSection(".data", + COFF::IMAGE_SCN_CNT_INITIALIZED_DATA + | COFF::IMAGE_SCN_MEM_READ + | COFF::IMAGE_SCN_MEM_WRITE, + SectionKind::getDataRel()); + EmitCodeAlignment(4, 0); + } + + 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); + } + +}; +} // 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()); + + 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)); +} + +// MCStreamer interface + +void WinCOFFStreamer::InitSections() { + SetSectionText(); + SetSectionData(); + SetSectionBSS(); + SetSectionText(); +} + +void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) { + assert(Symbol->isUndefined() && "Cannot define a symbol twice!"); + MCObjectStreamer::EmitLabel(Symbol); +} + +void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) { + llvm_unreachable("not implemented"); +} + +void WinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) { + llvm_unreachable("not implemented"); +} + +void WinCOFFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) { + assert((Symbol->isInSection() + ? Symbol->getSection().getVariant() == MCSection::SV_COFF + : true) && "Got non COFF section in the COFF backend!"); + // 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<const MCSymbolRefExpr>(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::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: + case MCSA_Weak: { + MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol); + 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"); + break; + } +} + +void WinCOFFStreamer::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!"); + 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!"); + + getAssembler().getOrCreateSymbolData(*CurSymbol).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"); + + getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags( + Type << COFF::SF_TypeShift, + COFF::SF_TypeMask); +} + +void WinCOFFStreamer::EndCOFFSymbolDef() { + assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!"); + CurSymbol = NULL; +} + +void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) { + llvm_unreachable("not implemented"); +} + +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 WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) { + assert((Symbol->isInSection() + ? Symbol->getSection().getVariant() == MCSection::SV_COFF + : true) && "Got non COFF section in the COFF backend!"); + AddCommonSymbol(Symbol, Size, 1, false); +} + +void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol, + unsigned Size,unsigned ByteAlignment) { + llvm_unreachable("not implemented"); +} + +void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, + uint64_t Size, unsigned ByteAlignment) { + llvm_unreachable("not implemented"); +} + +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::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); +} + +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::EmitFileDirective(StringRef Filename) { + // Ignore for now, linkers don't care, and proper debug + // info will be a much large effort. +} + +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 WinCOFFStreamer::Finish() { + MCObjectStreamer::Finish(); +} + +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; + } +} |
