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