1 //===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
11 #define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
13 #include "MCTargetDesc/ARMFixupKinds.h"
14 #include "llvm/MC/MCAsmBackend.h"
15 #include "llvm/MC/MCSubtargetInfo.h"
21 class ARMAsmBackend : public MCAsmBackend {
22 const MCSubtargetInfo *STI;
23 bool isThumbMode; // Currently emitting Thumb code.
24 bool IsLittleEndian; // Big or little endian.
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) {}
31 ~ARMAsmBackend() override { delete STI; }
33 unsigned getNumFixupKinds() const override {
34 return ARM::NumTargetFixupKinds;
37 bool hasNOP() const { return STI->getFeatureBits()[ARM::HasV6T2Ops]; }
39 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
41 /// processFixupValue - Target hook to process the literal value of a fixup
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;
48 unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value, bool IsPCRel,
49 MCContext *Ctx, bool IsLittleEndian,
50 bool IsResolved) const;
52 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
53 uint64_t Value, bool IsPCRel) const override;
55 unsigned getRelaxedOpcode(unsigned Op) const;
57 bool mayNeedRelaxation(const MCInst &Inst) const override;
59 const char *reasonForFixupRelaxation(const MCFixup &Fixup,
60 uint64_t Value) const;
62 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
63 const MCRelaxableFragment *DF,
64 const MCAsmLayout &Layout) const override;
66 void relaxInstruction(const MCInst &Inst, MCInst &Res) const override;
68 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
70 void handleAssemblerFlag(MCAssemblerFlag Flag) override;
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; }
77 } // end anonymous namespace