MCELFStreamer.h revision 360784 
1//===- MCELFStreamer.h - MCStreamer ELF Object File Interface ---*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_MC_MCELFSTREAMER_H
10#define LLVM_MC_MCELFSTREAMER_H
11
12#include "llvm/ADT/SmallVector.h"
13#include "llvm/MC/MCDirectives.h"
14#include "llvm/MC/MCObjectStreamer.h"
15
16namespace llvm {
17
18class MCAsmBackend;
19class MCCodeEmitter;
20class MCExpr;
21class MCInst;
22
23class MCELFStreamer : public MCObjectStreamer {
24public:
25  MCELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
26                std::unique_ptr<MCObjectWriter> OW,
27                std::unique_ptr<MCCodeEmitter> Emitter);
28
29  ~MCELFStreamer() override = default;
30
31  /// state management
32  void reset() override {
33    SeenIdent = false;
34    BundleGroups.clear();
35    MCObjectStreamer::reset();
36  }
37
38  /// \name MCStreamer Interface
39  /// @{
40
41  void InitSections(bool NoExecStack) override;
42  void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
43  void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
44  void EmitLabelAtPos(MCSymbol *Symbol, SMLoc Loc, MCFragment *F,
45                      uint64_t Offset) 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  void emitELFSymverDirective(StringRef AliasName,
56                              const MCSymbol *Aliasee) override;
57
58  void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
59                             unsigned ByteAlignment) override;
60
61  void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
62                    uint64_t Size = 0, unsigned ByteAlignment = 0,
63                    SMLoc L = SMLoc()) override;
64  void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
65                      unsigned ByteAlignment = 0) override;
66  void EmitValueImpl(const MCExpr *Value, unsigned Size,
67                     SMLoc Loc = SMLoc()) override;
68
69  void EmitIdent(StringRef IdentString) override;
70
71  void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned) override;
72
73  void emitCGProfileEntry(const MCSymbolRefExpr *From,
74                          const MCSymbolRefExpr *To, uint64_t Count) override;
75
76  void FinishImpl() override;
77
78  void EmitBundleAlignMode(unsigned AlignPow2) override;
79  void EmitBundleLock(bool AlignToEnd) override;
80  void EmitBundleUnlock() override;
81
82private:
83  bool isBundleLocked() const;
84  void EmitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override;
85  void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override;
86
87  void fixSymbolsInTLSFixups(const MCExpr *expr);
88  void finalizeCGProfileEntry(const MCSymbolRefExpr *&S);
89  void finalizeCGProfile();
90
91  /// Merge the content of the fragment \p EF into the fragment \p DF.
92  void mergeFragment(MCDataFragment *, MCDataFragment *);
93
94  bool SeenIdent = false;
95
96  /// BundleGroups - The stack of fragments holding the bundle-locked
97  /// instructions.
98  SmallVector<MCDataFragment *, 4> BundleGroups;
99};
100
101MCELFStreamer *createARMELFStreamer(MCContext &Context,
102                                    std::unique_ptr<MCAsmBackend> TAB,
103                                    std::unique_ptr<MCObjectWriter> OW,
104                                    std::unique_ptr<MCCodeEmitter> Emitter,
105                                    bool RelaxAll, bool IsThumb, bool IsAndroid);
106
107} // end namespace llvm
108
109#endif // LLVM_MC_MCELFSTREAMER_H
110