LLVM  8.0.0svn
BPFMCTargetDesc.cpp
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1 //===-- BPFMCTargetDesc.cpp - BPF Target Descriptions ---------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file provides BPF specific target descriptions.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "BPF.h"
19 #include "llvm/MC/MCInstrInfo.h"
20 #include "llvm/MC/MCRegisterInfo.h"
22 #include "llvm/Support/Host.h"
24 
25 #define GET_INSTRINFO_MC_DESC
26 #include "BPFGenInstrInfo.inc"
27 
28 #define GET_SUBTARGETINFO_MC_DESC
29 #include "BPFGenSubtargetInfo.inc"
30 
31 #define GET_REGINFO_MC_DESC
32 #include "BPFGenRegisterInfo.inc"
33 
34 using namespace llvm;
35 
37  MCInstrInfo *X = new MCInstrInfo();
38  InitBPFMCInstrInfo(X);
39  return X;
40 }
41 
44  InitBPFMCRegisterInfo(X, BPF::R11 /* RAReg doesn't exist */);
45  return X;
46 }
47 
49  StringRef CPU, StringRef FS) {
50  return createBPFMCSubtargetInfoImpl(TT, CPU, FS);
51 }
52 
54  std::unique_ptr<MCAsmBackend> &&MAB,
55  std::unique_ptr<MCObjectWriter> &&OW,
56  std::unique_ptr<MCCodeEmitter> &&Emitter,
57  bool RelaxAll) {
58  return createELFStreamer(Ctx, std::move(MAB), std::move(OW), std::move(Emitter),
59  RelaxAll);
60 }
61 
63  unsigned SyntaxVariant,
64  const MCAsmInfo &MAI,
65  const MCInstrInfo &MII,
66  const MCRegisterInfo &MRI) {
67  if (SyntaxVariant == 0)
68  return new BPFInstPrinter(MAI, MII, MRI);
69  return nullptr;
70 }
71 
72 namespace {
73 
74 class BPFMCInstrAnalysis : public MCInstrAnalysis {
75 public:
76  explicit BPFMCInstrAnalysis(const MCInstrInfo *Info)
77  : MCInstrAnalysis(Info) {}
78 
79  bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size,
80  uint64_t &Target) const override {
81  // The target is the 3rd operand of cond inst and the 1st of uncond inst.
82  int16_t Imm;
83  if (isConditionalBranch(Inst)) {
84  Imm = Inst.getOperand(2).getImm();
85  } else if (isUnconditionalBranch(Inst))
86  Imm = Inst.getOperand(0).getImm();
87  else
88  return false;
89 
90  Target = Addr + Size + Imm * Size;
91  return true;
92  }
93 };
94 
95 } // end anonymous namespace
96 
98  return new BPFMCInstrAnalysis(Info);
99 }
100 
101 extern "C" void LLVMInitializeBPFTargetMC() {
102  for (Target *T :
104  // Register the MC asm info.
106 
107  // Register the MC instruction info.
109 
110  // Register the MC register info.
112 
113  // Register the MC subtarget info.
116 
117  // Register the object streamer
119 
120  // Register the MCInstPrinter.
122 
123  // Register the MC instruction analyzer.
125  }
126 
127  // Register the MC code emitter
132 
133  // Register the ASM Backend
138 
144  } else {
149  }
150 
151 }
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
static void RegisterMCInstrAnalysis(Target &T, Target::MCInstrAnalysisCtorFnTy Fn)
RegisterMCInstrAnalysis - Register a MCInstrAnalysis implementation for the given target...
static MCSubtargetInfo * createBPFMCSubtargetInfo(const Triple &TT, StringRef CPU, StringRef FS)
static void RegisterMCInstPrinter(Target &T, Target::MCInstPrinterCtorTy Fn)
RegisterMCInstPrinter - Register a MCInstPrinter implementation for the given target.
Context object for machine code objects.
Definition: MCContext.h:63
MCCodeEmitter * createBPFbeMCCodeEmitter(const MCInstrInfo &MCII, const MCRegisterInfo &MRI, MCContext &Ctx)
static const bool IsLittleEndianHost
Definition: Host.h:50
MCAsmBackend * createBPFAsmBackend(const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI, const MCTargetOptions &Options)
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:161
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
int64_t getImm() const
Definition: MCInst.h:76
static void RegisterMCAsmBackend(Target &T, Target::MCAsmBackendCtorTy Fn)
RegisterMCAsmBackend - Register a MCAsmBackend implementation for the given target.
Streaming machine code generation interface.
Definition: MCStreamer.h:183
unsigned const MachineRegisterInfo * MRI
void LLVMInitializeBPFTargetMC()
MCStreamer * createELFStreamer(MCContext &Ctx, std::unique_ptr< MCAsmBackend > &&TAB, std::unique_ptr< MCObjectWriter > &&OW, std::unique_ptr< MCCodeEmitter > &&CE, bool RelaxAll)
Interface to description of machine instruction set.
Definition: MCInstrInfo.h:24
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)
static void RegisterMCSubtargetInfo(Target &T, Target::MCSubtargetInfoCtorFnTy Fn)
RegisterMCSubtargetInfo - Register a MCSubtargetInfo implementation for the given target...
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
static MCInstrAnalysis * createBPFInstrAnalysis(const MCInstrInfo *Info)
const MCOperand & getOperand(unsigned i) const
Definition: MCInst.h:182
static void RegisterMCCodeEmitter(Target &T, Target::MCCodeEmitterCtorTy Fn)
RegisterMCCodeEmitter - Register a MCCodeEmitter implementation for the given target.
MCAsmBackend * createBPFbeAsmBackend(const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI, const MCTargetOptions &Options)
static MCInstPrinter * createBPFMCInstPrinter(const Triple &T, unsigned SyntaxVariant, const MCAsmInfo &MAI, const MCInstrInfo &MII, const MCRegisterInfo &MRI)
static void RegisterMCRegInfo(Target &T, Target::MCRegInfoCtorFnTy Fn)
RegisterMCRegInfo - Register a MCRegisterInfo implementation for the given target.
Target - Wrapper for Target specific information.
static bool isUnconditionalBranch(TerminatorInst *Term)
Definition: ADCE.cpp:209
static MCInstrInfo * createBPFMCInstrInfo()
This is an instance of a target assembly language printer that converts an MCInst to valid target ass...
Definition: MCInstPrinter.h:40
static void RegisterMCInstrInfo(Target &T, Target::MCInstrInfoCtorFnTy Fn)
RegisterMCInstrInfo - Register a MCInstrInfo implementation for the given target. ...
Generic base class for all target subtargets.
uint32_t Size
Definition: Profile.cpp:47
static void RegisterELFStreamer(Target &T, Target::ELFStreamerCtorTy Fn)
Target & getTheBPFleTarget()
static MCRegisterInfo * createBPFMCRegisterInfo(const Triple &TT)
RegisterMCAsmInfo - Helper template for registering a target assembly info implementation.
MCCodeEmitter * createBPFMCCodeEmitter(const MCInstrInfo &MCII, const MCRegisterInfo &MRI, MCContext &Ctx)
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
Target & getTheBPFbeTarget()
Target & getTheBPFTarget()