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 17 using namespace llvm; 18 19 namespace { 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 unsigned PointerSize) {} 49 50 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute){} 51 52 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {} 53 54 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {} 55 virtual void EmitCOFFSymbolStorageClass(int StorageClass) {} 56 virtual void EmitCOFFSymbolType(int Type) {} 57 virtual void EndCOFFSymbolDef() {} 58 virtual void EmitCOFFSecRel32(MCSymbol const *Symbol) {} 59 60 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {} 61 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 62 unsigned ByteAlignment) {} 63 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, 64 unsigned ByteAlignment) {} 65 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0, 66 unsigned Size = 0, unsigned ByteAlignment = 0) {} 67 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, 68 uint64_t Size, unsigned ByteAlignment) {} 69 virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {} 70 71 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, 72 unsigned AddrSpace) {} 73 virtual void EmitULEB128Value(const MCExpr *Value) {} 74 virtual void EmitSLEB128Value(const MCExpr *Value) {} 75 virtual void EmitGPRel32Value(const MCExpr *Value) {} 76 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0, 77 unsigned ValueSize = 1, 78 unsigned MaxBytesToEmit = 0) {} 79 80 virtual void EmitCodeAlignment(unsigned ByteAlignment, 81 unsigned MaxBytesToEmit = 0) {} 82 83 virtual bool EmitValueToOffset(const MCExpr *Offset, 84 unsigned char Value = 0) { return false; } 85 86 virtual void EmitFileDirective(StringRef Filename) {} 87 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory, 88 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 StringRef FileName) {} 95 virtual void EmitInstruction(const MCInst &Inst) {} 96 97 virtual void FinishImpl() {} 98 99 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) { 100 RecordProcEnd(Frame); 101 } 102 103 /// @} 104 }; 105 106 } 107 108 MCStreamer *llvm::createNullStreamer(MCContext &Context) { 109 return new MCNullStreamer(Context); 110 } 111