llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h

   1 //===-- ARMAsmBackend.h - ARM 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 #ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
  10 #define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
  11
  12 #include "MCTargetDesc/ARMFixupKinds.h"
  13 #include "MCTargetDesc/ARMMCTargetDesc.h"
  14 #include "llvm/MC/MCAsmBackend.h"
  15 #include "llvm/MC/MCSubtargetInfo.h"
  16 #include "llvm/MC/TargetRegistry.h"
  17
  18 namespace llvm {
  19
  20 class ARMAsmBackend : public MCAsmBackend {
  21   bool isThumbMode;    // Currently emitting Thumb code.
  22 public:
  23   ARMAsmBackend(const Target &T, bool isThumb, llvm::endianness Endian)
  24       : MCAsmBackend(Endian), isThumbMode(isThumb) {}
  25
  26   unsigned getNumFixupKinds() const override {
  27     return ARM::NumTargetFixupKinds;
  28   }
  29
  30   bool hasNOP(const MCSubtargetInfo *STI) const {
  31     return STI->hasFeature(ARM::HasV6T2Ops);
  32   }
  33
  34   std::optional<MCFixupKind> getFixupKind(StringRef Name) const override;
  35
  36   const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
  37
  38   bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup,
  39                              const MCValue &Target,
  40                              const MCSubtargetInfo *STI) override;
  41
  42   unsigned adjustFixupValue(const MCAssembler &Asm, const MCFixup &Fixup,
  43                             const MCValue &Target, uint64_t Value,
  44                             bool IsResolved, MCContext &Ctx,
  45                             const MCSubtargetInfo *STI) const;
  46
  47   void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
  48                   const MCValue &Target, MutableArrayRef<char> Data,
  49                   uint64_t Value, bool IsResolved,
  50                   const MCSubtargetInfo *STI) const override;
  51
  52   unsigned getRelaxedOpcode(unsigned Op, const MCSubtargetInfo &STI) const;
  53
  54   bool mayNeedRelaxation(const MCInst &Inst,
  55                          const MCSubtargetInfo &STI) const override;
  56
  57   const char *reasonForFixupRelaxation(const MCFixup &Fixup,
  58                                        uint64_t Value) const;
  59
  60   bool fixupNeedsRelaxation(const MCFixup &Fixup,
  61                             uint64_t Value) const override;
  62
  63   void relaxInstruction(MCInst &Inst,
  64                         const MCSubtargetInfo &STI) const override;
  65
  66   bool writeNopData(raw_ostream &OS, uint64_t Count,
  67                     const MCSubtargetInfo *STI) const override;
  68
  69   void handleAssemblerFlag(MCAssemblerFlag Flag) override;
  70
  71   unsigned getPointerSize() const { return 4; }
  72   bool isThumb() const { return isThumbMode; }
  73   void setIsThumb(bool it) { isThumbMode = it; }
  74 };
  75 } // end namespace llvm
  76
  77 #endif