MCNullStreamer.cpp revision e6cdbf2f92a753ad547e3287e279bf47585b228d 
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#include "llvm/MC/MCValue.h"
17
18using namespace llvm;
19
20namespace {
21
22  class MCNullStreamer : public MCStreamer {
23  public:
24    MCNullStreamer(MCContext &Context) : MCStreamer(Context) {}
25
26    /// @name MCStreamer Interface
27    /// @{
28
29    virtual void SwitchSection(const MCSection *Section) {
30      CurSection = Section;
31    }
32
33    virtual void EmitLabel(MCSymbol *Symbol) {}
34
35    virtual void EmitAssemblerFlag(AssemblerFlag Flag) {}
36
37    virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
38                                bool MakeAbsolute = false) {}
39
40    virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute) {}
41
42    virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
43
44    virtual void EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) {}
45
46    virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
47                                  unsigned Pow2Alignment) {}
48
49    virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
50                              unsigned Size = 0, unsigned Pow2Alignment = 0) {}
51
52    virtual void EmitBytes(const StringRef &Data) {}
53
54    virtual void EmitValue(const MCValue &Value, unsigned Size) {}
55
56    virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
57                                      unsigned ValueSize = 1,
58                                      unsigned MaxBytesToEmit = 0) {}
59
60    virtual void EmitValueToOffset(const MCValue &Offset,
61                                   unsigned char Value = 0) {}
62
63    virtual void EmitInstruction(const MCInst &Inst) {}
64
65    virtual void Finish() {}
66
67    /// @}
68  };
69
70}
71
72MCStreamer *llvm::createNullStreamer(MCContext &Context) {
73  return new MCNullStreamer(Context);
74}
75