lib/MC/MCNullStreamer.cpp

   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 SwitchSection(const MCSection *Section) {
  29       CurSection = Section;
  30     }
  31
  32     virtual void EmitLabel(MCSymbol *Symbol) {}
  33
  34     virtual void EmitAssemblerFlag(AssemblerFlag Flag) {}
  35
  36     virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
  37
  38     virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute) {}
  39
  40     virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
  41
  42     virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
  43                                   unsigned ByteAlignment) {}
  44
  45     virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
  46                               unsigned Size = 0, unsigned ByteAlignment = 0) {}
  47
  48     virtual void EmitBytes(const StringRef &Data) {}
  49
  50     virtual void EmitValue(const MCExpr *Value, unsigned Size) {}
  51
  52     virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
  53                                       unsigned ValueSize = 1,
  54                                       unsigned MaxBytesToEmit = 0) {}
  55
  56     virtual void EmitValueToOffset(const MCExpr *Offset,
  57                                    unsigned char Value = 0) {}
  58
  59     virtual void EmitInstruction(const MCInst &Inst) {}
  60
  61     virtual void Finish() {}
  62
  63     /// @}
  64   };
  65
  66 }
  67
  68 MCStreamer *llvm::createNullStreamer(MCContext &Context) {
  69   return new MCNullStreamer(Context);
  70 }