MCNullStreamer.cpp revision aaec205b87637cd0d59d4f11630db603686eb73d 
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(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(StringRef Data, unsigned AddrSpace) {}
49
50    virtual void EmitValue(const MCExpr *Value, unsigned Size,
51                           unsigned AddrSpace) {}
52
53    virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
54                                      unsigned ValueSize = 1,
55                                      unsigned MaxBytesToEmit = 0) {}
56
57    virtual void EmitValueToOffset(const MCExpr *Offset,
58                                   unsigned char Value = 0) {}
59
60    virtual void EmitInstruction(const MCInst &Inst) {}
61
62    virtual void Finish() {}
63
64    /// @}
65  };
66
67}
68
69MCStreamer *llvm::createNullStreamer(MCContext &Context) {
70  return new MCNullStreamer(Context);
71}
72