1 //===-- MipsAsmBackend.h - Mips Asm Backend ------------------------------===// 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 // This file defines the MipsAsmBackend class. 11 // 12 //===----------------------------------------------------------------------===// 13 // 14 15 #ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSASMBACKEND_H 16 #define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSASMBACKEND_H 17 18 #include "MCTargetDesc/MipsFixupKinds.h" 19 #include "llvm/ADT/Triple.h" 20 #include "llvm/MC/MCAsmBackend.h" 21 22 namespace llvm { 23 24 class MCAssembler; 25 struct MCFixupKindInfo; 26 class Target; 27 class MCObjectWriter; 28 29 class MipsAsmBackend : public MCAsmBackend { 30 Triple::OSType OSType; 31 bool IsLittle; // Big or little endian 32 bool Is64Bit; // 32 or 64 bit words 33 34 public: 35 MipsAsmBackend(const Target &T, Triple::OSType OSType, bool IsLittle, 36 bool Is64Bit) 37 : MCAsmBackend(), OSType(OSType), IsLittle(IsLittle), Is64Bit(Is64Bit) {} 38 39 MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override; 40 41 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize, 42 uint64_t Value, bool IsPCRel) const override; 43 44 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override; 45 46 unsigned getNumFixupKinds() const override { 47 return Mips::NumTargetFixupKinds; 48 } 49 50 /// @name Target Relaxation Interfaces 51 /// @{ 52 53 /// MayNeedRelaxation - Check whether the given instruction may need 54 /// relaxation. 55 /// 56 /// \param Inst - The instruction to test. 57 bool mayNeedRelaxation(const MCInst &Inst) const override { 58 return false; 59 } 60 61 /// fixupNeedsRelaxation - Target specific predicate for whether a given 62 /// fixup requires the associated instruction to be relaxed. 63 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, 64 const MCRelaxableFragment *DF, 65 const MCAsmLayout &Layout) const override { 66 // FIXME. 67 llvm_unreachable("RelaxInstruction() unimplemented"); 68 return false; 69 } 70 71 /// RelaxInstruction - Relax the instruction in the given fragment 72 /// to the next wider instruction. 73 /// 74 /// \param Inst - The instruction to relax, which may be the same 75 /// as the output. 76 /// \param [out] Res On return, the relaxed instruction. 77 void relaxInstruction(const MCInst &Inst, MCInst &Res) const override {} 78 79 /// @} 80 81 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override; 82 83 void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout, 84 const MCFixup &Fixup, const MCFragment *DF, 85 const MCValue &Target, uint64_t &Value, 86 bool &IsResolved) override; 87 88 }; // class MipsAsmBackend 89 90 } // namespace 91 92 #endif 93
