MCNullStreamer.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
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#include "llvm/MC/MCContext.h"
12#include "llvm/MC/MCInst.h"
13#include "llvm/MC/MCSectionMachO.h"
14#include "llvm/MC/MCSymbol.h"
15
16using namespace llvm;
17
18namespace {
19
20  class MCNullStreamer : public MCStreamer {
21  public:
22    MCNullStreamer(MCContext &Context) : MCStreamer(Context) {}
23
24    /// @name MCStreamer Interface
25    /// @{
26
27    void ChangeSection(const MCSection *Section,
28                       const MCExpr *Subsection) override {
29    }
30
31    void EmitLabel(MCSymbol *Symbol) override {
32      assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
33      assert(getCurrentSection().first &&"Cannot emit before setting section!");
34      AssignSection(Symbol, getCurrentSection().first);
35    }
36    void EmitDebugLabel(MCSymbol *Symbol) override {
37      EmitLabel(Symbol);
38    }
39    void EmitAssemblerFlag(MCAssemblerFlag Flag) override {}
40    void EmitThumbFunc(MCSymbol *Func) override {}
41
42    void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override {}
43    void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override {}
44    void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
45                                  const MCSymbol *LastLabel,
46                                  const MCSymbol *Label,
47                                  unsigned PointerSize) override {}
48
49    bool EmitSymbolAttribute(MCSymbol *Symbol,
50                             MCSymbolAttr Attribute) override {
51      return true;
52    }
53
54    void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override {}
55
56    void BeginCOFFSymbolDef(const MCSymbol *Symbol) override {}
57    void EmitCOFFSymbolStorageClass(int StorageClass) override {}
58    void EmitCOFFSymbolType(int Type) override {}
59    void EndCOFFSymbolDef() override {}
60    void EmitCOFFSecRel32(MCSymbol const *Symbol) override {}
61
62    void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override {}
63    void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
64                          unsigned ByteAlignment) override {}
65    void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
66                               unsigned ByteAlignment) override {}
67    void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
68                      uint64_t Size = 0, unsigned ByteAlignment = 0) override {}
69    void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
70                        uint64_t Size, unsigned ByteAlignment) override {}
71    void EmitBytes(StringRef Data) override {}
72
73    void EmitValueImpl(const MCExpr *Value, unsigned Size) override {}
74    void EmitULEB128Value(const MCExpr *Value) override {}
75    void EmitSLEB128Value(const MCExpr *Value) override {}
76    void EmitGPRel32Value(const MCExpr *Value) override {}
77    void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
78                              unsigned ValueSize = 1,
79                              unsigned MaxBytesToEmit = 0) override {}
80
81    void EmitCodeAlignment(unsigned ByteAlignment,
82                           unsigned MaxBytesToEmit = 0) override {}
83
84    bool EmitValueToOffset(const MCExpr *Offset,
85                           unsigned char Value = 0) override { return false; }
86
87    void EmitFileDirective(StringRef Filename) override {}
88    unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
89                                    StringRef Filename,
90                                    unsigned CUID = 0) override {
91      return 0;
92    }
93    void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
94                               unsigned Column, unsigned Flags,
95                               unsigned Isa, unsigned Discriminator,
96                               StringRef FileName) override {}
97    void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo&) override {}
98
99    void EmitBundleAlignMode(unsigned AlignPow2) override {}
100    void EmitBundleLock(bool AlignToEnd) override {}
101    void EmitBundleUnlock() override {}
102
103    void FinishImpl() override {}
104
105    void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override {
106      RecordProcEnd(Frame);
107    }
108  };
109
110}
111
112MCStreamer *llvm::createNullStreamer(MCContext &Context) {
113  return new MCNullStreamer(Context);
114}
115