1//===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
10#define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
11
12#include "MCTargetDesc/ARMFixupKinds.h"
13#include "MCTargetDesc/ARMMCTargetDesc.h"
14#include "llvm/MC/MCAsmBackend.h"
15#include "llvm/MC/MCSubtargetInfo.h"
16#include "llvm/MC/TargetRegistry.h"
17
18namespace llvm {
19
20class ARMAsmBackend : public MCAsmBackend {
21 bool isThumbMode; // Currently emitting Thumb code.
22public:
23 ARMAsmBackend(const Target &T, bool isThumb, llvm::endianness Endian)
24 : MCAsmBackend(Endian), isThumbMode(isThumb) {}
25
26 unsigned getNumFixupKinds() const override {
27 return ARM::NumTargetFixupKinds;
28 }
29
30 bool hasNOP(const MCSubtargetInfo *STI) const {
31 return STI->hasFeature(Feature: ARM::HasV6T2Ops);
32 }
33
34 std::optional<MCFixupKind> getFixupKind(StringRef Name) const override;
35
36 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
37
38 bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup,
39 const MCValue &Target,
40 const MCSubtargetInfo *STI) override;
41
42 unsigned adjustFixupValue(const MCAssembler &Asm, const MCFixup &Fixup,
43 const MCValue &Target, uint64_t Value,
44 bool IsResolved, MCContext &Ctx,
45 const MCSubtargetInfo *STI) const;
46
47 void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
48 const MCValue &Target, MutableArrayRef<char> Data,
49 uint64_t Value, bool IsResolved,
50 const MCSubtargetInfo *STI) const override;
51
52 unsigned getRelaxedOpcode(unsigned Op, const MCSubtargetInfo &STI) const;
53
54 bool mayNeedRelaxation(const MCInst &Inst,
55 const MCSubtargetInfo &STI) const override;
56
57 const char *reasonForFixupRelaxation(const MCFixup &Fixup,
58 uint64_t Value) const;
59
60 bool fixupNeedsRelaxation(const MCFixup &Fixup,
61 uint64_t Value) const override;
62
63 void relaxInstruction(MCInst &Inst,
64 const MCSubtargetInfo &STI) const override;
65
66 bool writeNopData(raw_ostream &OS, uint64_t Count,
67 const MCSubtargetInfo *STI) const override;
68
69 void handleAssemblerFlag(MCAssemblerFlag Flag) override;
70
71 unsigned getPointerSize() const { return 4; }
72 bool isThumb() const { return isThumbMode; }
73 void setIsThumb(bool it) { isThumbMode = it; }
74};
75} // end namespace llvm
76
77#endif
78