1//===-- RISCVAsmBackend.h - RISC-V Assembler Backend ----------------------===//
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_RISCV_MCTARGETDESC_RISCVASMBACKEND_H
10#define LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVASMBACKEND_H
11
12#include "MCTargetDesc/RISCVBaseInfo.h"
13#include "MCTargetDesc/RISCVFixupKinds.h"
14#include "MCTargetDesc/RISCVMCTargetDesc.h"
15#include "llvm/ADT/StringMap.h"
16#include "llvm/MC/MCAsmBackend.h"
17#include "llvm/MC/MCFixupKindInfo.h"
18#include "llvm/MC/MCSubtargetInfo.h"
19
20namespace llvm {
21class MCAssembler;
22class MCObjectTargetWriter;
23class raw_ostream;
24
25class RISCVAsmBackend : public MCAsmBackend {
26 const MCSubtargetInfo &STI;
27 uint8_t OSABI;
28 bool Is64Bit;
29 const MCTargetOptions &TargetOptions;
30 // Temporary symbol used to check whether a PC-relative fixup is resolved.
31 MCSymbol *PCRelTemp = nullptr;
32
33 bool isPCRelFixupResolved(const MCSymbol *SymA, const MCFragment &F);
34
35 StringMap<MCSymbol *> VendorSymbols;
36
37public:
38 RISCVAsmBackend(const MCSubtargetInfo &STI, uint8_t OSABI, bool Is64Bit,
39 const MCTargetOptions &Options);
40 ~RISCVAsmBackend() override = default;
41
42 // Return Size with extra Nop Bytes for alignment directive in code section.
43 bool shouldInsertExtraNopBytesForCodeAlign(const MCAlignFragment &AF,
44 unsigned &Size) override;
45
46 // Insert target specific fixup type for alignment directive in code section.
47 bool shouldInsertFixupForCodeAlign(MCAssembler &Asm,
48 MCAlignFragment &AF) override;
49
50 bool evaluateTargetFixup(const MCFixup &Fixup, const MCValue &Target,
51 uint64_t &Value) override;
52
53 bool addReloc(const MCFragment &, const MCFixup &, const MCValue &,
54 uint64_t &FixedValue, bool IsResolved);
55
56 void maybeAddVendorReloc(const MCFragment &, const MCFixup &);
57
58 void applyFixup(const MCFragment &, const MCFixup &, const MCValue &Target,
59 MutableArrayRef<char> Data, uint64_t Value,
60 bool IsResolved) override;
61
62 std::unique_ptr<MCObjectTargetWriter>
63 createObjectTargetWriter() const override;
64
65 bool fixupNeedsRelaxationAdvanced(const MCFixup &, const MCValue &, uint64_t,
66 bool) const override;
67
68 std::optional<MCFixupKind> getFixupKind(StringRef Name) const override;
69
70 MCFixupKindInfo getFixupKindInfo(MCFixupKind Kind) const override;
71
72 bool mayNeedRelaxation(const MCInst &Inst,
73 const MCSubtargetInfo &STI) const override;
74
75 void relaxInstruction(MCInst &Inst,
76 const MCSubtargetInfo &STI) const override;
77
78 bool relaxDwarfLineAddr(MCDwarfLineAddrFragment &DF,
79 bool &WasRelaxed) const override;
80 bool relaxDwarfCFA(MCDwarfCallFrameFragment &DF,
81 bool &WasRelaxed) const override;
82 std::pair<bool, bool> relaxLEB128(MCLEBFragment &LF,
83 int64_t &Value) const override;
84
85 bool writeNopData(raw_ostream &OS, uint64_t Count,
86 const MCSubtargetInfo *STI) const override;
87
88 const MCTargetOptions &getTargetOptions() const { return TargetOptions; }
89};
90}
91
92#endif
93