1 //===- lib/MC/MCNullStreamer.cpp - Dummy Streamer Implementation ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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"
20 class MCNullStreamer : public MCStreamer {
22 MCNullStreamer(MCContext &Context) : MCStreamer(Context) {}
24 /// @name MCStreamer Interface
27 void ChangeSection(const MCSection *Section,
28 const MCExpr *Subsection) override {
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);
36 void EmitDebugLabel(MCSymbol *Symbol) override {
39 void EmitAssemblerFlag(MCAssemblerFlag Flag) override {}
40 void EmitThumbFunc(MCSymbol *Func) override {}
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 {}
49 bool EmitSymbolAttribute(MCSymbol *Symbol,
50 MCSymbolAttr Attribute) override {
54 void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override {}
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 {}
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 {}
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 {}
81 void EmitCodeAlignment(unsigned ByteAlignment,
82 unsigned MaxBytesToEmit = 0) override {}
84 bool EmitValueToOffset(const MCExpr *Offset,
85 unsigned char Value = 0) override { return false; }
87 void EmitFileDirective(StringRef Filename) override {}
88 unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
90 unsigned CUID = 0) override {
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 {}
99 void EmitBundleAlignMode(unsigned AlignPow2) override {}
100 void EmitBundleLock(bool AlignToEnd) override {}
101 void EmitBundleUnlock() override {}
103 void FinishImpl() override {}
105 void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override {
106 RecordProcEnd(Frame);
112 MCStreamer *llvm::createNullStreamer(MCContext &Context) {
113 return new MCNullStreamer(Context);