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, StringRef TT, bool IsLittle) 27 : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")), 28 isThumbMode(TT.startswith("thumb")), IsLittleEndian(IsLittle) {} 29 30 ~ARMAsmBackend() override { delete STI; } 31 32 unsigned getNumFixupKinds() const override { 33 return ARM::NumTargetFixupKinds; 34 } 35 36 bool hasNOP() const { return (STI->getFeatureBits() & ARM::HasV6T2Ops) != 0; } 37 38 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override; 39 40 /// processFixupValue - Target hook to process the literal value of a fixup 41 /// if necessary. 42 void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout, 43 const MCFixup &Fixup, const MCFragment *DF, 44 const MCValue &Target, uint64_t &Value, 45 bool &IsResolved) override; 46 47 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize, 48 uint64_t Value, bool IsPCRel) const override; 49 50 unsigned getRelaxedOpcode(unsigned Op) const; 51 52 bool mayNeedRelaxation(const MCInst &Inst) const override; 53 54 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, 55 const MCRelaxableFragment *DF, 56 const MCAsmLayout &Layout) const override; 57 58 void relaxInstruction(const MCInst &Inst, MCInst &Res) const override; 59 60 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override; 61 62 void handleAssemblerFlag(MCAssemblerFlag Flag) override; 63 64 unsigned getPointerSize() const { return 4; } 65 bool isThumb() const { return isThumbMode; } 66 void setIsThumb(bool it) { isThumbMode = it; } 67 bool isLittle() const { return IsLittleEndian; } 68 }; 69 } // end anonymous namespace 70 71 #endif 72
