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aa75693ea4
This has a few advantages: * Only targets that use a MCTargetStreamer have to worry about it. * There is never a MCTargetStreamer without a MCStreamer, so we can use a reference. * A MCTargetStreamer can talk to the MCStreamer in its constructor. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200129 91177308-0d34-0410-b5e6-96231b3b80d8
123 lines
4.5 KiB
C++
123 lines
4.5 KiB
C++
//===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- C++ -*-===//
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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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#ifndef LLVM_MC_MCOBJECTSTREAMER_H
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#define LLVM_MC_MCOBJECTSTREAMER_H
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCStreamer.h"
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namespace llvm {
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class MCAssembler;
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class MCCodeEmitter;
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class MCSectionData;
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class MCExpr;
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class MCFragment;
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class MCDataFragment;
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class MCAsmBackend;
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class raw_ostream;
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/// \brief Streaming object file generation interface.
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///
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/// This class provides an implementation of the MCStreamer interface which is
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/// suitable for use with the assembler backend. Specific object file formats
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/// are expected to subclass this interface to implement directives specific
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/// to that file format or custom semantics expected by the object writer
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/// implementation.
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class MCObjectStreamer : public MCStreamer {
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MCAssembler *Assembler;
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MCSectionData *CurSectionData;
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MCSectionData::iterator CurInsertionPoint;
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virtual void EmitInstToData(const MCInst &Inst) = 0;
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virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
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virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame);
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protected:
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MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &_OS,
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MCCodeEmitter *_Emitter);
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MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &_OS,
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MCCodeEmitter *_Emitter, MCAssembler *_Assembler);
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~MCObjectStreamer();
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public:
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/// state management
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virtual void reset();
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protected:
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MCSectionData *getCurrentSectionData() const {
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return CurSectionData;
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}
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MCFragment *getCurrentFragment() const;
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void insert(MCFragment *F) const {
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CurSectionData->getFragmentList().insert(CurInsertionPoint, F);
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F->setParent(CurSectionData);
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}
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/// Get a data fragment to write into, creating a new one if the current
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/// fragment is not a data fragment.
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MCDataFragment *getOrCreateDataFragment() const;
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const MCExpr *AddValueSymbols(const MCExpr *Value);
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public:
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MCAssembler &getAssembler() { return *Assembler; }
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/// @name MCStreamer Interface
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/// @{
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitDebugLabel(MCSymbol *Symbol);
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virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
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virtual void EmitValueImpl(const MCExpr *Value, unsigned Size);
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virtual void EmitULEB128Value(const MCExpr *Value);
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virtual void EmitSLEB128Value(const MCExpr *Value);
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virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
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virtual void ChangeSection(const MCSection *Section,
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const MCExpr *Subsection);
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virtual void EmitInstruction(const MCInst &Inst);
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/// \brief Emit an instruction to a special fragment, because this instruction
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/// can change its size during relaxation.
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virtual void EmitInstToFragment(const MCInst &Inst);
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virtual void EmitBundleAlignMode(unsigned AlignPow2);
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virtual void EmitBundleLock(bool AlignToEnd);
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virtual void EmitBundleUnlock();
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virtual void EmitBytes(StringRef Data);
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virtual void EmitValueToAlignment(unsigned ByteAlignment,
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int64_t Value = 0,
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unsigned ValueSize = 1,
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unsigned MaxBytesToEmit = 0);
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virtual void EmitCodeAlignment(unsigned ByteAlignment,
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unsigned MaxBytesToEmit = 0);
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virtual bool EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
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virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
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unsigned Column, unsigned Flags,
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unsigned Isa, unsigned Discriminator,
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StringRef FileName);
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virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
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const MCSymbol *LastLabel,
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const MCSymbol *Label,
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unsigned PointerSize);
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virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
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const MCSymbol *Label);
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virtual void EmitGPRel32Value(const MCExpr *Value);
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virtual void EmitGPRel64Value(const MCExpr *Value);
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virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue);
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virtual void EmitZeros(uint64_t NumBytes);
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virtual void FinishImpl();
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};
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} // end namespace llvm
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#endif
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