1 //===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===// 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 #ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H 11 #define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H 12 13 #include "MCTargetDesc/ARMFixupKinds.h" 14 #include "llvm/MC/MCAsmBackend.h" 15 #include "llvm/MC/MCSubtargetInfo.h" 16 17 using namespace llvm; 18 19 namespace { 20 21 class ARMAsmBackend : public MCAsmBackend { 22 const MCSubtargetInfo *STI; 23 bool isThumbMode; // Currently emitting Thumb code. 24 bool IsLittleEndian; // Big or little endian. 25 public: 26 ARMAsmBackend(const Target &T, const Triple &TT, bool IsLittle) 27 : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")), 28 isThumbMode(TT.getArchName().startswith("thumb")), 29 IsLittleEndian(IsLittle) {} 30 31 ~ARMAsmBackend() override { delete STI; } 32 33 unsigned getNumFixupKinds() const override { 34 return ARM::NumTargetFixupKinds; 35 } 36 37 bool hasNOP() const { return STI->getFeatureBits()[ARM::HasV6T2Ops]; } 38 39 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override; 40 41 /// processFixupValue - Target hook to process the literal value of a fixup 42 /// if necessary. 43 void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout, 44 const MCFixup &Fixup, const MCFragment *DF, 45 const MCValue &Target, uint64_t &Value, 46 bool &IsResolved) override; 47 48 unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value, bool IsPCRel, 49 MCContext *Ctx, bool IsLittleEndian, 50 bool IsResolved) const; 51 52 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize, 53 uint64_t Value, bool IsPCRel) const override; 54 55 unsigned getRelaxedOpcode(unsigned Op) const; 56 57 bool mayNeedRelaxation(const MCInst &Inst) const override; 58 59 const char *reasonForFixupRelaxation(const MCFixup &Fixup, 60 uint64_t Value) const; 61 62 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, 63 const MCRelaxableFragment *DF, 64 const MCAsmLayout &Layout) const override; 65 66 void relaxInstruction(const MCInst &Inst, MCInst &Res) const override; 67 68 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override; 69 70 void handleAssemblerFlag(MCAssemblerFlag Flag) override; 71 72 unsigned getPointerSize() const { return 4; } 73 bool isThumb() const { return isThumbMode; } 74 void setIsThumb(bool it) { isThumbMode = it; } 75 bool isLittle() const { return IsLittleEndian; } 76 }; 77 } // end anonymous namespace 78 79 #endif 80
