1 //===-------- MipsELFStreamer.h - ELF Object Output -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This is a custom MCELFStreamer which allows us to insert some hooks before
11 // emitting data into an actual object file.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H
16 #define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H
18 #include "MipsOptionRecord.h"
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/MC/MCELFStreamer.h"
27 class MCSubtargetInfo;
29 class MipsELFStreamer : public MCELFStreamer {
30 SmallVector<std::unique_ptr<MipsOptionRecord>, 8> MipsOptionRecords;
31 MipsRegInfoRecord *RegInfoRecord;
32 SmallVector<MCSymbol*, 4> Labels;
36 MipsELFStreamer(MCContext &Context, MCAsmBackend &MAB, raw_pwrite_stream &OS,
37 MCCodeEmitter *Emitter)
38 : MCELFStreamer(Context, MAB, OS, Emitter) {
40 RegInfoRecord = new MipsRegInfoRecord(this, Context);
41 MipsOptionRecords.push_back(
42 std::unique_ptr<MipsRegInfoRecord>(RegInfoRecord));
45 /// Overriding this function allows us to add arbitrary behaviour before the
46 /// \p Inst is actually emitted. For example, we can inspect the operands and
47 /// gather sufficient information that allows us to reason about the register
48 /// usage for the translation unit.
49 void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
51 /// Overriding this function allows us to record all labels that should be
52 /// marked as microMIPS. Based on this data marking is done in
54 void EmitLabel(MCSymbol *Symbol) override;
56 /// Overriding this function allows us to dismiss all labels that are
57 /// candidates for marking as microMIPS when .section directive is processed.
58 void SwitchSection(MCSection *Section,
59 const MCExpr *Subsection = nullptr) override;
61 /// Overriding this function allows us to dismiss all labels that are
62 /// candidates for marking as microMIPS when .word directive is emitted.
63 void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override;
65 /// Emits all the option records stored up until the point it's called.
66 void EmitMipsOptionRecords();
68 /// Mark labels as microMIPS, if necessary for the subtarget.
69 void createPendingLabelRelocs();
72 MCELFStreamer *createMipsELFStreamer(MCContext &Context, MCAsmBackend &MAB,
73 raw_pwrite_stream &OS,
74 MCCodeEmitter *Emitter, bool RelaxAll);