MCNullStreamer.cpp revision f410608271b6318bfc9e26c0d199f185d5a89ccb
1//===- lib/MC/MCNullStreamer.cpp - Dummy Streamer Implementation ----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#include "llvm/MC/MCStreamer.h" 11 12#include "llvm/MC/MCContext.h" 13#include "llvm/MC/MCInst.h" 14#include "llvm/MC/MCSectionMachO.h" 15#include "llvm/MC/MCSymbol.h" 16 17using namespace llvm; 18 19namespace { 20 21 class MCNullStreamer : public MCStreamer { 22 public: 23 MCNullStreamer(MCContext &Context) : MCStreamer(Context) {} 24 25 /// @name MCStreamer Interface 26 /// @{ 27 28 virtual void InitSections() { 29 } 30 31 virtual void ChangeSection(const MCSection *Section) { 32 } 33 34 virtual void EmitLabel(MCSymbol *Symbol) { 35 assert(Symbol->isUndefined() && "Cannot define a symbol twice!"); 36 assert(getCurrentSection() && "Cannot emit before setting section!"); 37 Symbol->setSection(*getCurrentSection()); 38 } 39 40 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {} 41 virtual void EmitThumbFunc(MCSymbol *Func) {} 42 43 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {} 44 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol){} 45 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, 46 const MCSymbol *LastLabel, 47 const MCSymbol *Label) {} 48 49 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute){} 50 51 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {} 52 53 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {} 54 virtual void EmitCOFFSymbolStorageClass(int StorageClass) {} 55 virtual void EmitCOFFSymbolType(int Type) {} 56 virtual void EndCOFFSymbolDef() {} 57 virtual void EmitCOFFSecRel32(MCSymbol const *Symbol) {} 58 59 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {} 60 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 61 unsigned ByteAlignment) {} 62 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {} 63 64 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0, 65 unsigned Size = 0, unsigned ByteAlignment = 0) {} 66 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, 67 uint64_t Size, unsigned ByteAlignment) {} 68 virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {} 69 70 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, 71 bool isPCRel, unsigned AddrSpace) {} 72 virtual void EmitULEB128Value(const MCExpr *Value, 73 unsigned AddrSpace = 0) {} 74 virtual void EmitSLEB128Value(const MCExpr *Value, 75 unsigned AddrSpace = 0) {} 76 virtual void EmitGPRel32Value(const MCExpr *Value) {} 77 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0, 78 unsigned ValueSize = 1, 79 unsigned MaxBytesToEmit = 0) {} 80 81 virtual void EmitCodeAlignment(unsigned ByteAlignment, 82 unsigned MaxBytesToEmit = 0) {} 83 84 virtual void EmitValueToOffset(const MCExpr *Offset, 85 unsigned char Value = 0) {} 86 87 virtual void EmitFileDirective(StringRef Filename) {} 88 virtual bool EmitDwarfFileDirective(unsigned FileNo,StringRef Filename) { 89 return false; 90 } 91 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 92 unsigned Column, unsigned Flags, 93 unsigned Isa, unsigned Discriminator) {} 94 virtual void EmitInstruction(const MCInst &Inst) {} 95 96 virtual void Finish() {} 97 98 /// @} 99 }; 100 101} 102 103MCStreamer *llvm::createNullStreamer(MCContext &Context) { 104 return new MCNullStreamer(Context); 105} 106