LLVM  13.0.0git
BPFMCTargetDesc.cpp
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1 //===-- BPFMCTargetDesc.cpp - BPF Target Descriptions ---------------------===//
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 provides BPF specific target descriptions.
10 //
11 //===----------------------------------------------------------------------===//
12 
18 #include "llvm/MC/MCInstrInfo.h"
19 #include "llvm/MC/MCRegisterInfo.h"
21 #include "llvm/Support/Host.h"
23 
24 #define GET_INSTRINFO_MC_DESC
25 #include "BPFGenInstrInfo.inc"
26 
27 #define GET_SUBTARGETINFO_MC_DESC
28 #include "BPFGenSubtargetInfo.inc"
29 
30 #define GET_REGINFO_MC_DESC
31 #include "BPFGenRegisterInfo.inc"
32 
33 using namespace llvm;
34 
36  MCInstrInfo *X = new MCInstrInfo();
37  InitBPFMCInstrInfo(X);
38  return X;
39 }
40 
43  InitBPFMCRegisterInfo(X, BPF::R11 /* RAReg doesn't exist */);
44  return X;
45 }
46 
48  StringRef CPU, StringRef FS) {
49  return createBPFMCSubtargetInfoImpl(TT, CPU, /*TuneCPU*/ CPU, FS);
50 }
51 
53  std::unique_ptr<MCAsmBackend> &&MAB,
54  std::unique_ptr<MCObjectWriter> &&OW,
55  std::unique_ptr<MCCodeEmitter> &&Emitter,
56  bool RelaxAll) {
57  return createELFStreamer(Ctx, std::move(MAB), std::move(OW), std::move(Emitter),
58  RelaxAll);
59 }
60 
62  unsigned SyntaxVariant,
63  const MCAsmInfo &MAI,
64  const MCInstrInfo &MII,
65  const MCRegisterInfo &MRI) {
66  if (SyntaxVariant == 0)
67  return new BPFInstPrinter(MAI, MII, MRI);
68  return nullptr;
69 }
70 
71 namespace {
72 
73 class BPFMCInstrAnalysis : public MCInstrAnalysis {
74 public:
75  explicit BPFMCInstrAnalysis(const MCInstrInfo *Info)
76  : MCInstrAnalysis(Info) {}
77 
78  bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size,
79  uint64_t &Target) const override {
80  // The target is the 3rd operand of cond inst and the 1st of uncond inst.
81  int16_t Imm;
82  if (isConditionalBranch(Inst)) {
83  Imm = Inst.getOperand(2).getImm();
84  } else if (isUnconditionalBranch(Inst))
85  Imm = Inst.getOperand(0).getImm();
86  else
87  return false;
88 
89  Target = Addr + Size + Imm * Size;
90  return true;
91  }
92 };
93 
94 } // end anonymous namespace
95 
97  return new BPFMCInstrAnalysis(Info);
98 }
99 
101  for (Target *T :
103  // Register the MC asm info.
105 
106  // Register the MC instruction info.
108 
109  // Register the MC register info.
111 
112  // Register the MC subtarget info.
115 
116  // Register the object streamer
118 
119  // Register the MCInstPrinter.
121 
122  // Register the MC instruction analyzer.
124  }
125 
126  // Register the MC code emitter
131 
132  // Register the ASM Backend
137 
143  } else {
148  }
149 
150 }
llvm::Check::Size
@ Size
Definition: FileCheck.h:73
BPFMCTargetDesc.h
llvm::getTheBPFleTarget
Target & getTheBPFleTarget()
Definition: BPFTargetInfo.cpp:14
llvm
Definition: AllocatorList.h:23
llvm::BPFInstPrinter
Definition: BPFInstPrinter.h:19
llvm::MCContext
Context object for machine code objects.
Definition: MCContext.h:71
llvm::Target
Target - Wrapper for Target specific information.
Definition: TargetRegistry.h:124
llvm::MCAsmInfo
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
Host.h
createBPFInstrAnalysis
static MCInstrAnalysis * createBPFInstrAnalysis(const MCInstrInfo *Info)
Definition: BPFMCTargetDesc.cpp:96
llvm::TargetRegistry::RegisterMCInstrAnalysis
static void RegisterMCInstrAnalysis(Target &T, Target::MCInstrAnalysisCtorFnTy Fn)
RegisterMCInstrAnalysis - Register a MCInstrAnalysis implementation for the given target.
Definition: TargetRegistry.h:731
llvm::Triple
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:45
T
#define T
Definition: Mips16ISelLowering.cpp:341
llvm::MCInst
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:183
llvm::TargetRegistry::RegisterMCInstPrinter
static void RegisterMCInstPrinter(Target &T, Target::MCInstPrinterCtorTy Fn)
RegisterMCInstPrinter - Register a MCInstPrinter implementation for the given target.
Definition: TargetRegistry.h:838
BPFTargetInfo.h
llvm::MCStreamer
Streaming machine code generation interface.
Definition: MCStreamer.h:197
llvm::X86AS::FS
@ FS
Definition: X86.h:183
MCInstrInfo.h
llvm::MCOperand::getImm
int64_t getImm() const
Definition: MCInst.h:79
llvm::MCInstrAnalysis
Definition: MCInstrAnalysis.h:27
MCSubtargetInfo.h
Info
Analysis containing CSE Info
Definition: CSEInfo.cpp:26
X
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
llvm::TargetRegistry::RegisterMCAsmBackend
static void RegisterMCAsmBackend(Target &T, Target::MCAsmBackendCtorTy Fn)
RegisterMCAsmBackend - Register a MCAsmBackend implementation for the given target.
Definition: TargetRegistry.h:785
llvm::MCInstPrinter
This is an instance of a target assembly language printer that converts an MCInst to valid target ass...
Definition: MCInstPrinter.h:43
LLVM_EXTERNAL_VISIBILITY
#define LLVM_EXTERNAL_VISIBILITY
Definition: Compiler.h:132
Addr
uint64_t Addr
Definition: ELFObjHandler.cpp:80
move
compiles ldr LCPI1_0 ldr ldr mov lsr tst moveq r1 ldr LCPI1_1 and r0 bx lr It would be better to do something like to fold the shift into the conditional move
Definition: README.txt:546
llvm::createBPFAsmBackend
MCAsmBackend * createBPFAsmBackend(const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI, const MCTargetOptions &Options)
Definition: BPFAsmBackend.cpp:99
BPFMCAsmInfo.h
MCRegisterInfo.h
llvm::getTheBPFbeTarget
Target & getTheBPFbeTarget()
Definition: BPFTargetInfo.cpp:18
llvm::TargetRegistry::RegisterMCSubtargetInfo
static void RegisterMCSubtargetInfo(Target &T, Target::MCSubtargetInfoCtorFnTy Fn)
RegisterMCSubtargetInfo - Register a MCSubtargetInfo implementation for the given target.
Definition: TargetRegistry.h:758
createBPFMCInstPrinter
static MCInstPrinter * createBPFMCInstPrinter(const Triple &T, unsigned SyntaxVariant, const MCAsmInfo &MAI, const MCInstrInfo &MII, const MCRegisterInfo &MRI)
Definition: BPFMCTargetDesc.cpp:61
createBPFMCRegisterInfo
static MCRegisterInfo * createBPFMCRegisterInfo(const Triple &TT)
Definition: BPFMCTargetDesc.cpp:41
MCInstrAnalysis.h
llvm::StringRef
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:57
llvm::createBPFbeMCCodeEmitter
MCCodeEmitter * createBPFbeMCCodeEmitter(const MCInstrInfo &MCII, const MCRegisterInfo &MRI, MCContext &Ctx)
Definition: BPFMCCodeEmitter.cpp:81
llvm::createBPFMCCodeEmitter
MCCodeEmitter * createBPFMCCodeEmitter(const MCInstrInfo &MCII, const MCRegisterInfo &MRI, MCContext &Ctx)
Definition: BPFMCCodeEmitter.cpp:75
llvm::RegisterMCAsmInfo
RegisterMCAsmInfo - Helper template for registering a target assembly info implementation.
Definition: TargetRegistry.h:953
llvm::MCRegisterInfo
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
Definition: MCRegisterInfo.h:135
MRI
unsigned const MachineRegisterInfo * MRI
Definition: AArch64AdvSIMDScalarPass.cpp:105
isUnconditionalBranch
static bool isUnconditionalBranch(Instruction *Term)
Definition: ADCE.cpp:210
llvm::createELFStreamer
MCStreamer * createELFStreamer(MCContext &Ctx, std::unique_ptr< MCAsmBackend > &&TAB, std::unique_ptr< MCObjectWriter > &&OW, std::unique_ptr< MCCodeEmitter > &&CE, bool RelaxAll)
Definition: MCELFStreamer.cpp:714
llvm::TargetRegistry::RegisterMCInstrInfo
static void RegisterMCInstrInfo(Target &T, Target::MCInstrInfoCtorFnTy Fn)
RegisterMCInstrInfo - Register a MCInstrInfo implementation for the given target.
Definition: TargetRegistry.h:725
llvm::TargetRegistry::RegisterMCCodeEmitter
static void RegisterMCCodeEmitter(Target &T, Target::MCCodeEmitterCtorTy Fn)
RegisterMCCodeEmitter - Register a MCCodeEmitter implementation for the given target.
Definition: TargetRegistry.h:851
llvm::MCInstrInfo
Interface to description of machine instruction set.
Definition: MCInstrInfo.h:25
llvm::TargetRegistry::RegisterMCRegInfo
static void RegisterMCRegInfo(Target &T, Target::MCRegInfoCtorFnTy Fn)
RegisterMCRegInfo - Register a MCRegisterInfo implementation for the given target.
Definition: TargetRegistry.h:745
llvm::TargetRegistry::RegisterELFStreamer
static void RegisterELFStreamer(Target &T, Target::ELFStreamerCtorTy Fn)
Definition: TargetRegistry.h:863
createBPFMCInstrInfo
static MCInstrInfo * createBPFMCInstrInfo()
Definition: BPFMCTargetDesc.cpp:35
BPFInstPrinter.h
createBPFMCSubtargetInfo
static MCSubtargetInfo * createBPFMCSubtargetInfo(const Triple &TT, StringRef CPU, StringRef FS)
Definition: BPFMCTargetDesc.cpp:47
llvm::getTheBPFTarget
Target & getTheBPFTarget()
Definition: BPFTargetInfo.cpp:22
llvm::sys::IsLittleEndianHost
static const bool IsLittleEndianHost
Definition: SwapByteOrder.h:101
llvm::MCInst::getOperand
const MCOperand & getOperand(unsigned i) const
Definition: MCInst.h:205
createBPFMCStreamer
static MCStreamer * createBPFMCStreamer(const Triple &T, MCContext &Ctx, std::unique_ptr< MCAsmBackend > &&MAB, std::unique_ptr< MCObjectWriter > &&OW, std::unique_ptr< MCCodeEmitter > &&Emitter, bool RelaxAll)
Definition: BPFMCTargetDesc.cpp:52
llvm::createBPFbeAsmBackend
MCAsmBackend * createBPFbeAsmBackend(const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI, const MCTargetOptions &Options)
Definition: BPFAsmBackend.cpp:106
TargetRegistry.h
llvm::MCSubtargetInfo
Generic base class for all target subtargets.
Definition: MCSubtargetInfo.h:75
LLVMInitializeBPFTargetMC
LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFTargetMC()
Definition: BPFMCTargetDesc.cpp:100