src/llvm/include/llvm/CodeGen/MachinePassRegistry.h

   1 //===-- llvm/CodeGen/MachinePassRegistry.h ----------------------*- C++ -*-===//
   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 contains the mechanics for machine function pass registries.  A
  11 // function pass registry (MachinePassRegistry) is auto filled by the static
  12 // constructors of MachinePassRegistryNode.  Further there is a command line
  13 // parser (RegisterPassParser) which listens to each registry for additions
  14 // and deletions, so that the appropriate command option is updated.
  15 //
  16 //===----------------------------------------------------------------------===//
  17
  18 #ifndef LLVM_CODEGEN_MACHINEPASSREGISTRY_H
  19 #define LLVM_CODEGEN_MACHINEPASSREGISTRY_H
  20
  21 #include "llvm/CodeGen/Passes.h"
  22 #include "llvm/Support/CommandLine.h"
  23
  24 namespace llvm {
  25
  26 typedef void *(*MachinePassCtor)();
  27
  28
  29 //===----------------------------------------------------------------------===//
  30 ///
  31 /// MachinePassRegistryListener - Listener to adds and removals of nodes in
  32 /// registration list.
  33 ///
  34 //===----------------------------------------------------------------------===//
  35 class MachinePassRegistryListener {
  36   virtual void anchor();
  37 public:
  38   MachinePassRegistryListener() {}
  39   virtual ~MachinePassRegistryListener() {}
  40   virtual void NotifyAdd(const char *N, MachinePassCtor C, const char *D) = 0;
  41   virtual void NotifyRemove(const char *N) = 0;
  42 };
  43
  44
  45 //===----------------------------------------------------------------------===//
  46 ///
  47 /// MachinePassRegistryNode - Machine pass node stored in registration list.
  48 ///
  49 //===----------------------------------------------------------------------===//
  50 class MachinePassRegistryNode {
  51
  52 private:
  53
  54   MachinePassRegistryNode *Next;        // Next function pass in list.
  55   const char *Name;                     // Name of function pass.
  56   const char *Description;              // Description string.
  57   MachinePassCtor Ctor;                 // Function pass creator.
  58
  59 public:
  60
  61   MachinePassRegistryNode(const char *N, const char *D, MachinePassCtor C)
  62   : Next(nullptr)
  63   , Name(N)
  64   , Description(D)
  65   , Ctor(C)
  66   {}
  67
  68   // Accessors
  69   MachinePassRegistryNode *getNext()      const { return Next; }
  70   MachinePassRegistryNode **getNextAddress()    { return &Next; }
  71   const char *getName()                   const { return Name; }
  72   const char *getDescription()            const { return Description; }
  73   MachinePassCtor getCtor()               const { return Ctor; }
  74   void setNext(MachinePassRegistryNode *N)      { Next = N; }
  75
  76 };
  77
  78
  79 //===----------------------------------------------------------------------===//
  80 ///
  81 /// MachinePassRegistry - Track the registration of machine passes.
  82 ///
  83 //===----------------------------------------------------------------------===//
  84 class MachinePassRegistry {
  85
  86 private:
  87
  88   MachinePassRegistryNode *List;        // List of registry nodes.
  89   MachinePassCtor Default;              // Default function pass creator.
  90   MachinePassRegistryListener* Listener;// Listener for list adds are removes.
  91
  92 public:
  93
  94   // NO CONSTRUCTOR - we don't want static constructor ordering to mess
  95   // with the registry.
  96
  97   // Accessors.
  98   //
  99   MachinePassRegistryNode *getList()                    { return List; }
 100   MachinePassCtor getDefault()                          { return Default; }
 101   void setDefault(MachinePassCtor C)                    { Default = C; }
 102   void setDefault(StringRef Name);
 103   void setListener(MachinePassRegistryListener *L)      { Listener = L; }
 104
 105   /// Add - Adds a function pass to the registration list.
 106   ///
 107   void Add(MachinePassRegistryNode *Node);
 108
 109   /// Remove - Removes a function pass from the registration list.
 110   ///
 111   void Remove(MachinePassRegistryNode *Node);
 112
 113 };
 114
 115
 116 //===----------------------------------------------------------------------===//
 117 ///
 118 /// RegisterPassParser class - Handle the addition of new machine passes.
 119 ///
 120 //===----------------------------------------------------------------------===//
 121 template<class RegistryClass>
 122 class RegisterPassParser : public MachinePassRegistryListener,
 123                    public cl::parser<typename RegistryClass::FunctionPassCtor> {
 124 public:
 125   RegisterPassParser() {}
 126   ~RegisterPassParser() { RegistryClass::setListener(nullptr); }
 127
 128   void initialize(cl::Option &O) {
 129     cl::parser<typename RegistryClass::FunctionPassCtor>::initialize(O);
 130
 131     // Add existing passes to option.
 132     for (RegistryClass *Node = RegistryClass::getList();
 133          Node; Node = Node->getNext()) {
 134       this->addLiteralOption(Node->getName(),
 135                       (typename RegistryClass::FunctionPassCtor)Node->getCtor(),
 136                              Node->getDescription());
 137     }
 138
 139     // Make sure we listen for list changes.
 140     RegistryClass::setListener(this);
 141   }
 142
 143   // Implement the MachinePassRegistryListener callbacks.
 144   //
 145   void NotifyAdd(const char *N, MachinePassCtor C, const char *D) override {
 146     this->addLiteralOption(N, (typename RegistryClass::FunctionPassCtor)C, D);
 147   }
 148   void NotifyRemove(const char *N) override {
 149     this->removeLiteralOption(N);
 150   }
 151 };
 152
 153
 154 } // end namespace llvm
 155
 156 #endif