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
16 using namespace llvm;
17
18 namespace {
19
20 class MCNullStreamer : public MCStreamer {
21 public:
MCNullStreamer(MCContext & Context)22 MCNullStreamer(MCContext &Context) : MCStreamer(SK_NullStreamer, Context) {}
23
24 /// @name MCStreamer Interface
25 /// @{
26
InitToTextSection()27 virtual void InitToTextSection() {
28 }
29
InitSections()30 virtual void InitSections() {
31 }
32
ChangeSection(const MCSection * Section)33 virtual void ChangeSection(const MCSection *Section) {
34 }
35
EmitLabel(MCSymbol * Symbol)36 virtual void EmitLabel(MCSymbol *Symbol) {
37 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
38 assert(getCurrentSection() && "Cannot emit before setting section!");
39 Symbol->setSection(*getCurrentSection());
40 }
EmitDebugLabel(MCSymbol * Symbol)41 virtual void EmitDebugLabel(MCSymbol *Symbol) {
42 EmitLabel(Symbol);
43 }
EmitAssemblerFlag(MCAssemblerFlag Flag)44 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
EmitThumbFunc(MCSymbol * Func)45 virtual void EmitThumbFunc(MCSymbol *Func) {}
46
EmitAssignment(MCSymbol * Symbol,const MCExpr * Value)47 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
EmitWeakReference(MCSymbol * Alias,const MCSymbol * Symbol)48 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol){}
EmitDwarfAdvanceLineAddr(int64_t LineDelta,const MCSymbol * LastLabel,const MCSymbol * Label,unsigned PointerSize)49 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
50 const MCSymbol *LastLabel,
51 const MCSymbol *Label,
52 unsigned PointerSize) {}
53
EmitSymbolAttribute(MCSymbol * Symbol,MCSymbolAttr Attribute)54 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute){}
55
EmitSymbolDesc(MCSymbol * Symbol,unsigned DescValue)56 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
57
BeginCOFFSymbolDef(const MCSymbol * Symbol)58 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
EmitCOFFSymbolStorageClass(int StorageClass)59 virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
EmitCOFFSymbolType(int Type)60 virtual void EmitCOFFSymbolType(int Type) {}
EndCOFFSymbolDef()61 virtual void EndCOFFSymbolDef() {}
EmitCOFFSecRel32(MCSymbol const * Symbol)62 virtual void EmitCOFFSecRel32(MCSymbol const *Symbol) {}
63
EmitELFSize(MCSymbol * Symbol,const MCExpr * Value)64 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
EmitCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)65 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
66 unsigned ByteAlignment) {}
EmitLocalCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)67 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
68 unsigned ByteAlignment) {}
EmitZerofill(const MCSection * Section,MCSymbol * Symbol=0,uint64_t Size=0,unsigned ByteAlignment=0)69 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
70 uint64_t Size = 0, unsigned ByteAlignment = 0) {}
EmitTBSSSymbol(const MCSection * Section,MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)71 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
72 uint64_t Size, unsigned ByteAlignment) {}
EmitBytes(StringRef Data,unsigned AddrSpace)73 virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
74
EmitValueImpl(const MCExpr * Value,unsigned Size,unsigned AddrSpace)75 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
76 unsigned AddrSpace) {}
EmitULEB128Value(const MCExpr * Value)77 virtual void EmitULEB128Value(const MCExpr *Value) {}
EmitSLEB128Value(const MCExpr * Value)78 virtual void EmitSLEB128Value(const MCExpr *Value) {}
EmitGPRel32Value(const MCExpr * Value)79 virtual void EmitGPRel32Value(const MCExpr *Value) {}
EmitValueToAlignment(unsigned ByteAlignment,int64_t Value=0,unsigned ValueSize=1,unsigned MaxBytesToEmit=0)80 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
81 unsigned ValueSize = 1,
82 unsigned MaxBytesToEmit = 0) {}
83
EmitCodeAlignment(unsigned ByteAlignment,unsigned MaxBytesToEmit=0)84 virtual void EmitCodeAlignment(unsigned ByteAlignment,
85 unsigned MaxBytesToEmit = 0) {}
86
EmitValueToOffset(const MCExpr * Offset,unsigned char Value=0)87 virtual bool EmitValueToOffset(const MCExpr *Offset,
88 unsigned char Value = 0) { return false; }
89
EmitFileDirective(StringRef Filename)90 virtual void EmitFileDirective(StringRef Filename) {}
EmitDwarfFileDirective(unsigned FileNo,StringRef Directory,StringRef Filename,unsigned CUID=0)91 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
92 StringRef Filename, unsigned CUID = 0) {
93 return false;
94 }
EmitDwarfLocDirective(unsigned FileNo,unsigned Line,unsigned Column,unsigned Flags,unsigned Isa,unsigned Discriminator,StringRef FileName)95 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
96 unsigned Column, unsigned Flags,
97 unsigned Isa, unsigned Discriminator,
98 StringRef FileName) {}
EmitInstruction(const MCInst & Inst)99 virtual void EmitInstruction(const MCInst &Inst) {}
100
EmitBundleAlignMode(unsigned AlignPow2)101 virtual void EmitBundleAlignMode(unsigned AlignPow2) {}
EmitBundleLock(bool AlignToEnd)102 virtual void EmitBundleLock(bool AlignToEnd) {}
EmitBundleUnlock()103 virtual void EmitBundleUnlock() {}
104
FinishImpl()105 virtual void FinishImpl() {}
106
EmitCFIEndProcImpl(MCDwarfFrameInfo & Frame)107 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
108 RecordProcEnd(Frame);
109 }
110
111 /// @}
112
classof(const MCStreamer * S)113 static bool classof(const MCStreamer *S) {
114 return S->getKind() == SK_NullStreamer;
115 }
116
117 };
118
119 }
120
createNullStreamer(MCContext & Context)121 MCStreamer *llvm::createNullStreamer(MCContext &Context) {
122 return new MCNullStreamer(Context);
123 }
124