mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79746 91177308-0d34-0410-b5e6-96231b3b80d8
213 lines
6.4 KiB
C++
213 lines
6.4 KiB
C++
//===- lib/MC/MCMachOStreamer.cpp - Mach-O Object Output ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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namespace {
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class MCMachOStreamer : public MCStreamer {
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MCAssembler Assembler;
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MCSectionData *CurSectionData;
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DenseMap<const MCSection*, MCSectionData*> SectionMap;
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DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
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private:
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MCFragment *getCurrentFragment() const {
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assert(CurSectionData && "No current section!");
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if (!CurSectionData->empty())
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return &CurSectionData->getFragmentList().back();
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return 0;
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}
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MCSymbolData &getSymbolData(MCSymbol &Symbol) {
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MCSymbolData *&Entry = SymbolMap[&Symbol];
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if (!Entry)
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Entry = new MCSymbolData(Symbol, 0, 0, &Assembler);
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return *Entry;
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}
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public:
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MCMachOStreamer(MCContext &Context, raw_ostream &_OS)
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: MCStreamer(Context), Assembler(_OS), CurSectionData(0) {}
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~MCMachOStreamer() {}
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/// @name MCStreamer Interface
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/// @{
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virtual void SwitchSection(const MCSection *Section);
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitAssemblerFlag(AssemblerFlag Flag);
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virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
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bool MakeAbsolute = false);
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virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
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virtual void EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value);
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virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
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unsigned Pow2Alignment, bool IsLocal);
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virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = NULL,
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unsigned Size = 0, unsigned Pow2Alignment = 0);
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virtual void EmitBytes(const StringRef &Data);
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virtual void EmitValue(const MCValue &Value, unsigned Size);
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virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
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unsigned ValueSize = 1,
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unsigned MaxBytesToEmit = 0);
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virtual void EmitValueToOffset(const MCValue &Offset,
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unsigned char Value = 0);
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virtual void EmitInstruction(const MCInst &Inst);
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virtual void Finish();
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/// @}
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};
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} // end anonymous namespace.
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void MCMachOStreamer::SwitchSection(const MCSection *Section) {
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assert(Section && "Cannot switch to a null section!");
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// If already in this section, then this is a noop.
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if (Section == CurSection) return;
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CurSection = Section;
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MCSectionData *&Entry = SectionMap[Section];
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if (!Entry)
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Entry = new MCSectionData(*Section, &Assembler);
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CurSectionData = Entry;
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}
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void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
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if (!F)
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F = new MCDataFragment(CurSectionData);
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MCSymbolData &SD = getSymbolData(*Symbol);
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assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
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SD.setFragment(F);
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SD.setOffset(F->getContents().size());
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Symbol->setSection(*CurSection);
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}
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void MCMachOStreamer::EmitAssemblerFlag(AssemblerFlag Flag) {
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llvm_unreachable("FIXME: Not yet implemented!");
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}
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void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol,
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const MCValue &Value,
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bool MakeAbsolute) {
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// Only absolute symbols can be redefined.
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assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
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"Cannot define a symbol twice!");
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llvm_unreachable("FIXME: Not yet implemented!");
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}
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void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
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SymbolAttr Attribute) {
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switch (Attribute) {
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default:
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llvm_unreachable("FIXME: Not yet implemented!");
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case MCStreamer::Global:
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getSymbolData(*Symbol).setExternal(true);
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break;
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}
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}
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void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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llvm_unreachable("FIXME: Not yet implemented!");
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}
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void MCMachOStreamer::EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) {
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llvm_unreachable("FIXME: Not yet implemented!");
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}
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void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
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unsigned Pow2Alignment,
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bool IsLocal) {
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llvm_unreachable("FIXME: Not yet implemented!");
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}
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void MCMachOStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
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unsigned Size, unsigned Pow2Alignment) {
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llvm_unreachable("FIXME: Not yet implemented!");
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}
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void MCMachOStreamer::EmitBytes(const StringRef &Data) {
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MCDataFragment *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
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if (!DF)
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DF = new MCDataFragment(CurSectionData);
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DF->getContents().append(Data.begin(), Data.end());
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}
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void MCMachOStreamer::EmitValue(const MCValue &Value, unsigned Size) {
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new MCFillFragment(Value, Size, 1, CurSectionData);
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}
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void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
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int64_t Value, unsigned ValueSize,
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unsigned MaxBytesToEmit) {
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if (MaxBytesToEmit == 0)
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MaxBytesToEmit = ByteAlignment;
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new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
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CurSectionData);
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// Update the maximum alignment on the current section if necessary.
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if (ByteAlignment > CurSectionData->getAlignment())
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CurSectionData->setAlignment(ByteAlignment);
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}
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void MCMachOStreamer::EmitValueToOffset(const MCValue &Offset,
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unsigned char Value) {
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new MCOrgFragment(Offset, Value, CurSectionData);
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}
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void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
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llvm_unreachable("FIXME: Not yet implemented!");
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}
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void MCMachOStreamer::Finish() {
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Assembler.Finish();
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}
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MCStreamer *llvm::createMachOStreamer(MCContext &Context, raw_ostream &OS) {
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return new MCMachOStreamer(Context, OS);
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}
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