1//===- MCELFStreamer.h - MCStreamer ELF Object File Interface ---*- C++ -*-===// 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#ifndef LLVM_MC_MCELFSTREAMER_H 11#define LLVM_MC_MCELFSTREAMER_H 12 13#include "llvm/ADT/SmallVector.h" 14#include "llvm/MC/MCDirectives.h" 15#include "llvm/MC/MCObjectStreamer.h" 16 17namespace llvm { 18 19class MCAsmBackend; 20class MCCodeEmitter; 21class MCExpr; 22class MCInst; 23 24class MCELFStreamer : public MCObjectStreamer { 25public: 26 MCELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_pwrite_stream &OS, 27 MCCodeEmitter *Emitter) 28 : MCObjectStreamer(Context, TAB, OS, Emitter) {} 29 30 ~MCELFStreamer() override = default; 31 32 /// state management 33 void reset() override { 34 SeenIdent = false; 35 BundleGroups.clear(); 36 MCObjectStreamer::reset(); 37 } 38 39 /// \name MCStreamer Interface 40 /// @{ 41 42 void InitSections(bool NoExecStack) override; 43 void ChangeSection(MCSection *Section, const MCExpr *Subsection) override; 44 void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override; 45 void EmitLabel(MCSymbol *Symbol, SMLoc Loc, MCFragment *F) override; 46 void EmitAssemblerFlag(MCAssemblerFlag Flag) override; 47 void EmitThumbFunc(MCSymbol *Func) override; 48 void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override; 49 bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override; 50 void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override; 51 void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 52 unsigned ByteAlignment) override; 53 54 void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override; 55 56 void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, 57 unsigned ByteAlignment) override; 58 59 void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr, 60 uint64_t Size = 0, unsigned ByteAlignment = 0) override; 61 void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size, 62 unsigned ByteAlignment = 0) override; 63 void EmitValueImpl(const MCExpr *Value, unsigned Size, 64 SMLoc Loc = SMLoc()) override; 65 66 void EmitIdent(StringRef IdentString) override; 67 68 void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned) override; 69 70 void FinishImpl() override; 71 72 void EmitBundleAlignMode(unsigned AlignPow2) override; 73 void EmitBundleLock(bool AlignToEnd) override; 74 void EmitBundleUnlock() override; 75 76private: 77 bool isBundleLocked() const; 78 void EmitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override; 79 void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override; 80 81 void fixSymbolsInTLSFixups(const MCExpr *expr); 82 83 /// \brief Merge the content of the fragment \p EF into the fragment \p DF. 84 void mergeFragment(MCDataFragment *, MCDataFragment *); 85 86 bool SeenIdent = false; 87 88 /// BundleGroups - The stack of fragments holding the bundle-locked 89 /// instructions. 90 SmallVector<MCDataFragment *, 4> BundleGroups; 91}; 92 93MCELFStreamer *createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB, 94 raw_pwrite_stream &OS, 95 MCCodeEmitter *Emitter, bool RelaxAll, 96 bool IsThumb); 97 98} // end namespace llvm 99 100#endif // LLVM_MC_MCELFSTREAMER_H 101