1 //===-- LoongArchAsmBackend.h - LoongArch Assembler Backend ---*- 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 // This file defines the LoongArchAsmBackend class. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_LOONGARCH_MCTARGETDESC_LOONGARCHASMBACKEND_H 14 #define LLVM_LIB_TARGET_LOONGARCH_MCTARGETDESC_LOONGARCHASMBACKEND_H 15 16 #include "MCTargetDesc/LoongArchBaseInfo.h" 17 #include "MCTargetDesc/LoongArchFixupKinds.h" 18 #include "MCTargetDesc/LoongArchMCTargetDesc.h" 19 #include "llvm/MC/MCAsmBackend.h" 20 #include "llvm/MC/MCExpr.h" 21 #include "llvm/MC/MCFixupKindInfo.h" 22 #include "llvm/MC/MCSection.h" 23 #include "llvm/MC/MCSubtargetInfo.h" 24 25 namespace llvm { 26 27 class LoongArchAsmBackend : public MCAsmBackend { 28 const MCSubtargetInfo &STI; 29 uint8_t OSABI; 30 bool Is64Bit; 31 const MCTargetOptions &TargetOptions; 32 DenseMap<MCSection *, const MCSymbolRefExpr *> SecToAlignSym; 33 34 public: 35 LoongArchAsmBackend(const MCSubtargetInfo &STI, uint8_t OSABI, bool Is64Bit, 36 const MCTargetOptions &Options) 37 : MCAsmBackend(llvm::endianness::little, 38 LoongArch::fixup_loongarch_relax), 39 STI(STI), OSABI(OSABI), Is64Bit(Is64Bit), TargetOptions(Options) {} 40 ~LoongArchAsmBackend() override {} 41 42 bool handleAddSubRelocations(const MCAsmLayout &Layout, const MCFragment &F, 43 const MCFixup &Fixup, const MCValue &Target, 44 uint64_t &FixedValue) const override; 45 46 void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, 47 const MCValue &Target, MutableArrayRef<char> Data, 48 uint64_t Value, bool IsResolved, 49 const MCSubtargetInfo *STI) const override; 50 51 // Return Size with extra Nop Bytes for alignment directive in code section. 52 bool shouldInsertExtraNopBytesForCodeAlign(const MCAlignFragment &AF, 53 unsigned &Size) override; 54 55 // Insert target specific fixup type for alignment directive in code section. 56 bool shouldInsertFixupForCodeAlign(MCAssembler &Asm, 57 const MCAsmLayout &Layout, 58 MCAlignFragment &AF) override; 59 60 bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup, 61 const MCValue &Target, 62 const MCSubtargetInfo *STI) override; 63 64 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, 65 const MCRelaxableFragment *DF, 66 const MCAsmLayout &Layout) const override { 67 return false; 68 } 69 70 unsigned getNumFixupKinds() const override { 71 return LoongArch::NumTargetFixupKinds; 72 } 73 74 std::optional<MCFixupKind> getFixupKind(StringRef Name) const override; 75 76 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override; 77 78 void relaxInstruction(MCInst &Inst, 79 const MCSubtargetInfo &STI) const override {} 80 81 std::pair<bool, bool> relaxLEB128(MCLEBFragment &LF, MCAsmLayout &Layout, 82 int64_t &Value) const override; 83 84 bool relaxDwarfLineAddr(MCDwarfLineAddrFragment &DF, MCAsmLayout &Layout, 85 bool &WasRelaxed) const override; 86 bool relaxDwarfCFA(MCDwarfCallFrameFragment &DF, MCAsmLayout &Layout, 87 bool &WasRelaxed) const override; 88 89 bool writeNopData(raw_ostream &OS, uint64_t Count, 90 const MCSubtargetInfo *STI) const override; 91 92 std::unique_ptr<MCObjectTargetWriter> 93 createObjectTargetWriter() const override; 94 const MCTargetOptions &getTargetOptions() const { return TargetOptions; } 95 DenseMap<MCSection *, const MCSymbolRefExpr *> &getSecToAlignSym() { 96 return SecToAlignSym; 97 } 98 }; 99 } // end namespace llvm 100 101 #endif // LLVM_LIB_TARGET_LOONGARCH_MCTARGETDESC_LOONGARCHASMBACKEND_H 102