| //===- MipsELFStreamer.h - ELF Object Output --------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This is a custom MCELFStreamer which allows us to insert some hooks before |
| // emitting data into an actual object file. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H |
| #define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H |
| |
| #include "MipsOptionRecord.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/MC/MCELFStreamer.h" |
| #include <memory> |
| |
| namespace llvm { |
| |
| class MCAsmBackend; |
| class MCCodeEmitter; |
| class MCContext; |
| class MCSubtargetInfo; |
| struct MCDwarfFrameInfo; |
| |
| class MipsELFStreamer : public MCELFStreamer { |
| SmallVector<std::unique_ptr<MipsOptionRecord>, 8> MipsOptionRecords; |
| MipsRegInfoRecord *RegInfoRecord; |
| SmallVector<MCSymbol*, 4> Labels; |
| |
| public: |
| MipsELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB, |
| std::unique_ptr<MCObjectWriter> OW, |
| std::unique_ptr<MCCodeEmitter> Emitter); |
| |
| /// Overriding this function allows us to add arbitrary behaviour before the |
| /// \p Inst is actually emitted. For example, we can inspect the operands and |
| /// gather sufficient information that allows us to reason about the register |
| /// usage for the translation unit. |
| void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, |
| bool = false) override; |
| |
| /// Overriding this function allows us to record all labels that should be |
| /// marked as microMIPS. Based on this data marking is done in |
| /// EmitInstruction. |
| void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override; |
| |
| /// Overriding this function allows us to dismiss all labels that are |
| /// candidates for marking as microMIPS when .section directive is processed. |
| void SwitchSection(MCSection *Section, |
| const MCExpr *Subsection = nullptr) override; |
| |
| /// Overriding these functions allows us to dismiss all labels that are |
| /// candidates for marking as microMIPS when .word/.long/.4byte etc |
| /// directives are emitted. |
| void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override; |
| void EmitIntValue(uint64_t Value, unsigned Size) override; |
| |
| // Overriding these functions allows us to avoid recording of these labels |
| // in EmitLabel and later marking them as microMIPS. |
| void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override; |
| void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override; |
| MCSymbol *EmitCFILabel() override; |
| |
| /// Emits all the option records stored up until the point it's called. |
| void EmitMipsOptionRecords(); |
| |
| /// Mark labels as microMIPS, if necessary for the subtarget. |
| void createPendingLabelRelocs(); |
| }; |
| |
| MCELFStreamer *createMipsELFStreamer(MCContext &Context, |
| std::unique_ptr<MCAsmBackend> MAB, |
| std::unique_ptr<MCObjectWriter> OW, |
| std::unique_ptr<MCCodeEmitter> Emitter, |
| bool RelaxAll); |
| } // end namespace llvm |
| |
| #endif // LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSELFSTREAMER_H |