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