1 //===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_MC_MCOBJECTSTREAMER_H
11 #define LLVM_MC_MCOBJECTSTREAMER_H
13 #include "llvm/MC/MCAssembler.h"
14 #include "llvm/MC/MCStreamer.h"
26 /// \brief Streaming object file generation interface.
28 /// This class provides an implementation of the MCStreamer interface which is
29 /// suitable for use with the assembler backend. Specific object file formats
30 /// are expected to subclass this interface to implement directives specific
31 /// to that file format or custom semantics expected by the object writer
33 class MCObjectStreamer : public MCStreamer {
34 MCAssembler *Assembler;
35 MCSectionData *CurSectionData;
36 MCSectionData::iterator CurInsertionPoint;
38 virtual void EmitInstToData(const MCInst &Inst) = 0;
39 virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
40 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame);
43 MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &_OS,
44 MCCodeEmitter *_Emitter);
45 MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &_OS,
46 MCCodeEmitter *_Emitter, MCAssembler *_Assembler);
54 MCSectionData *getCurrentSectionData() const {
55 return CurSectionData;
58 MCFragment *getCurrentFragment() const;
60 void insert(MCFragment *F) const {
61 CurSectionData->getFragmentList().insert(CurInsertionPoint, F);
62 F->setParent(CurSectionData);
65 /// Get a data fragment to write into, creating a new one if the current
66 /// fragment is not a data fragment.
67 MCDataFragment *getOrCreateDataFragment() const;
69 const MCExpr *AddValueSymbols(const MCExpr *Value);
72 MCAssembler &getAssembler() { return *Assembler; }
74 /// @name MCStreamer Interface
77 virtual void EmitLabel(MCSymbol *Symbol);
78 virtual void EmitDebugLabel(MCSymbol *Symbol);
79 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
80 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size);
81 virtual void EmitULEB128Value(const MCExpr *Value);
82 virtual void EmitSLEB128Value(const MCExpr *Value);
83 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
84 virtual void ChangeSection(const MCSection *Section,
85 const MCExpr *Subsection);
86 virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo& STI);
88 /// \brief Emit an instruction to a special fragment, because this instruction
89 /// can change its size during relaxation.
90 virtual void EmitInstToFragment(const MCInst &Inst);
92 virtual void EmitBundleAlignMode(unsigned AlignPow2);
93 virtual void EmitBundleLock(bool AlignToEnd);
94 virtual void EmitBundleUnlock();
95 virtual void EmitBytes(StringRef Data);
96 virtual void EmitValueToAlignment(unsigned ByteAlignment,
98 unsigned ValueSize = 1,
99 unsigned MaxBytesToEmit = 0);
100 virtual void EmitCodeAlignment(unsigned ByteAlignment,
101 unsigned MaxBytesToEmit = 0);
102 virtual bool EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
103 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
104 unsigned Column, unsigned Flags,
105 unsigned Isa, unsigned Discriminator,
107 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
108 const MCSymbol *LastLabel,
109 const MCSymbol *Label,
110 unsigned PointerSize);
111 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
112 const MCSymbol *Label);
113 virtual void EmitGPRel32Value(const MCExpr *Value);
114 virtual void EmitGPRel64Value(const MCExpr *Value);
115 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue);
116 virtual void EmitZeros(uint64_t NumBytes);
117 virtual void FinishImpl();
120 } // end namespace llvm