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 "MCTargetDesc/ARMMCTargetDesc.h"
15 #include "llvm/MC/MCAsmBackend.h"
16 #include "llvm/MC/MCSubtargetInfo.h"
17 #include "llvm/Support/TargetRegistry.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 MCSubtargetInfo &STI, bool IsLittle)
27 : MCAsmBackend(), STI(STI),
28 isThumbMode(STI.getTargetTriple().isThumb()),
29 IsLittleEndian(IsLittle) {}
31 unsigned getNumFixupKinds() const override {
32 return ARM::NumTargetFixupKinds;
35 bool hasNOP() const { return STI.getFeatureBits()[ARM::HasV6T2Ops]; }
37 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
39 bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup,
40 const MCValue &Target) override;
42 unsigned adjustFixupValue(const MCAssembler &Asm, const MCFixup &Fixup,
43 const MCValue &Target, uint64_t Value,
44 bool IsResolved, MCContext &Ctx,
45 bool IsLittleEndian) const;
47 void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
48 const MCValue &Target, MutableArrayRef<char> Data,
49 uint64_t Value, bool IsResolved) const override;
51 unsigned getRelaxedOpcode(unsigned Op) const;
53 bool mayNeedRelaxation(const MCInst &Inst) const override;
55 const char *reasonForFixupRelaxation(const MCFixup &Fixup,
56 uint64_t Value) const;
58 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
59 const MCRelaxableFragment *DF,
60 const MCAsmLayout &Layout) const override;
62 void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
63 MCInst &Res) const override;
65 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
67 void handleAssemblerFlag(MCAssemblerFlag Flag) override;
69 unsigned getPointerSize() const { return 4; }
70 bool isThumb() const { return isThumbMode; }
71 void setIsThumb(bool it) { isThumbMode = it; }
72 bool isLittle() const { return IsLittleEndian; }
74 } // end namespace llvm