22  *
  23  */
  24 
  25 // PcDescs map a physical PC (given as offset from start of nmethod) to
  26 // the corresponding source scope and byte code index.
  27 
  28 class nmethod;
  29 
  30 class PcDesc VALUE_OBJ_CLASS_SPEC {
  31   friend class VMStructs;
  32  private:
  33   int _pc_offset;           // offset from start of nmethod
  34   int _scope_decode_offset; // offset for scope in nmethod
  35   int _obj_decode_offset;
  36 
  37   union PcDescFlags {
  38     int word;
  39     struct {
  40       unsigned int reexecute: 1;
  41       unsigned int is_method_handle_invoke: 1;

  42     } bits;
  43     bool operator ==(const PcDescFlags& other) { return word == other.word; }
  44   } _flags;
  45 
  46  public:
  47   int pc_offset() const           { return _pc_offset;   }
  48   int scope_decode_offset() const { return _scope_decode_offset; }
  49   int obj_decode_offset() const   { return _obj_decode_offset; }
  50 
  51   void set_pc_offset(int x)           { _pc_offset           = x; }
  52   void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
  53   void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }
  54 
  55   // Constructor (only used for static in nmethod.cpp)
  56   // Also used by ScopeDesc::sender()]
  57   PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
  58 
  59   enum {
  60     // upper and lower exclusive limits real offsets:
  61     lower_offset_limit = -1,
  62     upper_offset_limit = (unsigned int)-1 >> 1
  63   };
  64 
  65   // Flags
  66   bool     should_reexecute()              const { return _flags.bits.reexecute; }
  67   void set_should_reexecute(bool z)              { _flags.bits.reexecute = z;    }
  68 
  69   // Does pd refer to the same information as pd?
  70   bool is_same_info(const PcDesc* pd) {
  71     return _scope_decode_offset == pd->_scope_decode_offset &&
  72       _obj_decode_offset == pd->_obj_decode_offset &&
  73       _flags == pd->_flags;
  74   }
  75 
  76   bool     is_method_handle_invoke()       const { return _flags.bits.is_method_handle_invoke;     }
  77   void set_is_method_handle_invoke(bool z)       {        _flags.bits.is_method_handle_invoke = z; }
  78 



  79   // Returns the real pc
  80   address real_pc(const nmethod* code) const;
  81 
  82   void print(nmethod* code);
  83   bool verify(nmethod* code);
  84 };

  22  *
  23  */
  24 
  25 // PcDescs map a physical PC (given as offset from start of nmethod) to
  26 // the corresponding source scope and byte code index.
  27 
  28 class nmethod;
  29 
  30 class PcDesc VALUE_OBJ_CLASS_SPEC {
  31   friend class VMStructs;
  32  private:
  33   int _pc_offset;           // offset from start of nmethod
  34   int _scope_decode_offset; // offset for scope in nmethod
  35   int _obj_decode_offset;
  36 
  37   union PcDescFlags {
  38     int word;
  39     struct {
  40       unsigned int reexecute: 1;
  41       unsigned int is_method_handle_invoke: 1;
  42       unsigned int return_oop: 1;
  43     } bits;
  44     bool operator ==(const PcDescFlags& other) { return word == other.word; }
  45   } _flags;
  46 
  47  public:
  48   int pc_offset() const           { return _pc_offset;   }
  49   int scope_decode_offset() const { return _scope_decode_offset; }
  50   int obj_decode_offset() const   { return _obj_decode_offset; }
  51 
  52   void set_pc_offset(int x)           { _pc_offset           = x; }
  53   void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
  54   void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }
  55 
  56   // Constructor (only used for static in nmethod.cpp)
  57   // Also used by ScopeDesc::sender()]
  58   PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
  59 
  60   enum {
  61     // upper and lower exclusive limits real offsets:
  62     lower_offset_limit = -1,
  63     upper_offset_limit = (unsigned int)-1 >> 1
  64   };
  65 
  66   // Flags
  67   bool     should_reexecute()              const { return _flags.bits.reexecute; }
  68   void set_should_reexecute(bool z)              { _flags.bits.reexecute = z;    }
  69 
  70   // Does pd refer to the same information as pd?
  71   bool is_same_info(const PcDesc* pd) {
  72     return _scope_decode_offset == pd->_scope_decode_offset &&
  73       _obj_decode_offset == pd->_obj_decode_offset &&
  74       _flags == pd->_flags;
  75   }
  76 
  77   bool     is_method_handle_invoke()       const { return _flags.bits.is_method_handle_invoke;     }
  78   void set_is_method_handle_invoke(bool z)       {        _flags.bits.is_method_handle_invoke = z; }
  79 
  80   bool     return_oop()                    const { return _flags.bits.return_oop;     }
  81   void set_return_oop(bool z)                    {        _flags.bits.return_oop = z; }
  82 
  83   // Returns the real pc
  84   address real_pc(const nmethod* code) const;
  85 
  86   void print(nmethod* code);
  87   bool verify(nmethod* code);
  88 };