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, StringRef TT, bool IsLittle)
27 : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")),
28 isThumbMode(TT.startswith("thumb")), IsLittleEndian(IsLittle) {}
30 ~ARMAsmBackend() override { delete STI; }
32 unsigned getNumFixupKinds() const override {
33 return ARM::NumTargetFixupKinds;
36 bool hasNOP() const { return STI->getFeatureBits()[ARM::HasV6T2Ops]; }
38 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
40 /// processFixupValue - Target hook to process the literal value of a fixup
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;
47 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
48 uint64_t Value, bool IsPCRel) const override;
50 unsigned getRelaxedOpcode(unsigned Op) const;
52 bool mayNeedRelaxation(const MCInst &Inst) const override;
54 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
55 const MCRelaxableFragment *DF,
56 const MCAsmLayout &Layout) const override;
58 void relaxInstruction(const MCInst &Inst, MCInst &Res) const override;
60 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
62 void handleAssemblerFlag(MCAssemblerFlag Flag) override;
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; }
69 } // end anonymous namespace