MCNullStreamer.cpp revision 4d01cbe93b0e1a349b5c2881f1b319963f9e0504 
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      assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
34      assert(CurSection && "Cannot emit before setting section!");
35      Symbol->setSection(*CurSection);
36    }
37
38    virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
39
40    virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
41
42    virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute){}
43
44    virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
45
46    virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
47    virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
48    virtual void EmitCOFFSymbolType(int Type) {}
49    virtual void EndCOFFSymbolDef() {}
50
51    virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
52    virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
53                                  unsigned ByteAlignment) {}
54    virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {}
55
56    virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
57                              unsigned Size = 0, unsigned ByteAlignment = 0) {}
58    virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
59                                uint64_t Size, unsigned ByteAlignment) {}
60    virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
61
62    virtual void EmitValue(const MCExpr *Value, unsigned Size,
63                           unsigned AddrSpace) {}
64    virtual void EmitGPRel32Value(const MCExpr *Value) {}
65    virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
66                                      unsigned ValueSize = 1,
67                                      unsigned MaxBytesToEmit = 0) {}
68
69    virtual void EmitCodeAlignment(unsigned ByteAlignment,
70                                   unsigned MaxBytesToEmit = 0) {}
71
72    virtual void EmitValueToOffset(const MCExpr *Offset,
73                                   unsigned char Value = 0) {}
74
75    virtual void EmitFileDirective(StringRef Filename) {}
76    virtual void EmitDwarfFileDirective(unsigned FileNo,StringRef Filename) {}
77    virtual void EmitInstruction(const MCInst &Inst) {}
78
79    virtual void Finish() {}
80
81    /// @}
82  };
83
84}
85
86MCStreamer *llvm::createNullStreamer(MCContext &Context) {
87  return new MCNullStreamer(Context);
88}
89