MCNullStreamer.cpp revision 202878 
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 SwitchSection(const MCSection *Section) {
29      CurSection = Section;
30    }
31
32    virtual void EmitLabel(MCSymbol *Symbol) {}
33
34    virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
35
36    virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
37
38    virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute){}
39
40    virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
41
42    virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
43                                  unsigned ByteAlignment) {}
44    virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {}
45
46    virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
47                              unsigned Size = 0, unsigned ByteAlignment = 0) {}
48
49    virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
50
51    virtual void EmitValue(const MCExpr *Value, unsigned Size,
52                           unsigned AddrSpace) {}
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 MCExpr *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