MCNullStreamer.cpp revision 7092c7e1dcf9d05741b400dd54bbd7d3419773b2 
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 EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
45                                  unsigned ByteAlignment) {}
46
47    virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
48                              unsigned Size = 0, unsigned ByteAlignment = 0) {}
49
50    virtual void EmitBytes(const StringRef &Data) {}
51
52    virtual void EmitValue(const MCValue &Value, unsigned Size) {}
53
54    virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
55                                      unsigned ValueSize = 1,
56                                      unsigned MaxBytesToEmit = 0) {}
57
58    virtual void EmitValueToOffset(const MCValue &Offset,
59                                   unsigned char Value = 0) {}
60
61    virtual void EmitInstruction(const MCInst &Inst) {}
62
63    virtual void Finish() {}
64
65    /// @}
66  };
67
68}
69
70MCStreamer *llvm::createNullStreamer(MCContext &Context) {
71  return new MCNullStreamer(Context);
72}
73