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MipsAsmBackend.h
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1 //===-- MipsAsmBackend.h - Mips Asm 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 // This file defines the MipsAsmBackend class.
10 //
11 //===----------------------------------------------------------------------===//
12 //
13 
14 #ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSASMBACKEND_H
15 #define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSASMBACKEND_H
16 
18 #include "llvm/ADT/Triple.h"
19 #include "llvm/MC/MCAsmBackend.h"
20 
21 namespace llvm {
22 
23 class MCAssembler;
24 struct MCFixupKindInfo;
25 class MCRegisterInfo;
26 class Target;
27 
28 class MipsAsmBackend : public MCAsmBackend {
29  Triple TheTriple;
30  bool IsN32;
31 
32 public:
33  MipsAsmBackend(const Target &T, const MCRegisterInfo &MRI, const Triple &TT,
34  StringRef CPU, bool N32)
35  : MCAsmBackend(TT.isLittleEndian() ? support::little : support::big),
36  TheTriple(TT), IsN32(N32) {}
37 
38  std::unique_ptr<MCObjectTargetWriter>
39  createObjectTargetWriter() const override;
40 
41  void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
43  uint64_t Value, bool IsResolved,
44  const MCSubtargetInfo *STI) const override;
45 
47  const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
48 
49  unsigned getNumFixupKinds() const override {
51  }
52 
53  /// @name Target Relaxation Interfaces
54  /// @{
55 
56  /// MayNeedRelaxation - Check whether the given instruction may need
57  /// relaxation.
58  ///
59  /// \param Inst - The instruction to test.
60  bool mayNeedRelaxation(const MCInst &Inst,
61  const MCSubtargetInfo &STI) const override {
62  return false;
63  }
64 
65  /// fixupNeedsRelaxation - Target specific predicate for whether a given
66  /// fixup requires the associated instruction to be relaxed.
67  bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
68  const MCRelaxableFragment *DF,
69  const MCAsmLayout &Layout) const override {
70  // FIXME.
71  llvm_unreachable("RelaxInstruction() unimplemented");
72  return false;
73  }
74 
75  bool writeNopData(raw_ostream &OS, uint64_t Count) const override;
76 
77  bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup,
78  const MCValue &Target) override;
79 
80  bool isMicroMips(const MCSymbol *Sym) const override;
81 }; // class MipsAsmBackend
82 
83 } // namespace
84 
85 #endif
void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsResolved, const MCSubtargetInfo *STI) const override
ApplyFixup - Apply the Value for given Fixup into the provided data fragment, at the offset specified...
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool mayNeedRelaxation(const MCInst &Inst, const MCSubtargetInfo &STI) const override
MayNeedRelaxation - Check whether the given instruction may need relaxation.
This represents an "assembler immediate".
Definition: MCValue.h:37
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
amdgpu Simplify well known AMD library false FunctionCallee Value const Twine & Name
bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target) override
Hook to check if a relocation is needed for some target specific reason.
Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction)...
Definition: MCFixup.h:82
Encapsulates the layout of an assembly file at a particular point in time.
Definition: MCAsmLayout.h:28
const MCFixupKindInfo & getFixupKindInfo(MCFixupKind Kind) const override
Get information on a fixup kind.
unsigned getNumFixupKinds() const override
Get the number of target specific fixup kinds.
MipsAsmBackend(const Target &T, const MCRegisterInfo &MRI, const Triple &TT, StringRef CPU, bool N32)
std::unique_ptr< MCObjectTargetWriter > createObjectTargetWriter() const override
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:158
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
A relaxable fragment holds on to its MCInst, since it may need to be relaxed during the assembler lay...
Definition: MCFragment.h:261
unsigned const MachineRegisterInfo * MRI
MutableArrayRef - Represent a mutable reference to an array (0 or more elements consecutively in memo...
Definition: ArrayRef.h:298
MCFixupKind
Extensible enumeration to represent the type of a fixup.
Definition: MCFixup.h:22
bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const override
fixupNeedsRelaxation - Target specific predicate for whether a given fixup requires the associated in...
bool writeNopData(raw_ostream &OS, uint64_t Count) const override
WriteNopData - Write an (optimal) nop sequence of Count bytes to the given output.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:45
static RegisterPass< DebugifyFunctionPass > DF("debugify-function", "Attach debug info to a function")
PowerPC TLS Dynamic Call Fixup
Target - Wrapper for Target specific information.
bool isMicroMips(const MCSymbol *Sym) const override
Check whether a given symbol has been flagged with MICROMIPS flag.
Generic base class for all target subtargets.
Optional< MCFixupKind > getFixupKind(StringRef Name) const override
Map a relocation name used in .reloc to a fixup kind.
Target independent information on a fixup kind.
LLVM Value Representation.
Definition: Value.h:74
Generic interface to target specific assembler backends.
Definition: MCAsmBackend.h:36
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:57