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src/hotspot/share/code/pcDesc.hpp

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 27 
 28 
 29 // PcDescs map a physical PC (given as offset from start of nmethod) to
 30 // the corresponding source scope and byte code index.
 31 
 32 class CompiledMethod;
 33 
 34 class PcDesc {
 35   friend class VMStructs;
 36  private:
 37   int _pc_offset;           // offset from start of nmethod
 38   int _scope_decode_offset; // offset for scope in nmethod
 39   int _obj_decode_offset;
 40 
 41   enum {
 42     PCDESC_reexecute                 = 1 << 0,
 43     PCDESC_is_method_handle_invoke   = 1 << 1,
 44     PCDESC_return_oop                = 1 << 2,
 45     PCDESC_rethrow_exception         = 1 << 3,
 46     PCDESC_has_ea_local_in_scope     = 1 << 4,
 47     PCDESC_arg_escape                = 1 << 5

 48   };
 49 
 50   int _flags;
 51 
 52   void set_flag(int mask, bool z) {
 53     _flags = z ? (_flags | mask) : (_flags & ~mask);
 54   }
 55 
 56  public:
 57   int pc_offset() const           { return _pc_offset;   }
 58   int scope_decode_offset() const { return _scope_decode_offset; }
 59   int obj_decode_offset() const   { return _obj_decode_offset; }
 60 
 61   void set_pc_offset(int x)           { _pc_offset           = x; }
 62   void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
 63   void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }
 64 
 65   // Constructor (only used for static in nmethod.cpp)
 66   // Also used by ScopeDesc::sender()]
 67   PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);

 74 
 75   // Flags
 76   bool     rethrow_exception()              const { return (_flags & PCDESC_rethrow_exception) != 0; }
 77   void set_rethrow_exception(bool z)              { set_flag(PCDESC_rethrow_exception, z); }
 78   bool     should_reexecute()              const { return (_flags & PCDESC_reexecute) != 0; }
 79   void set_should_reexecute(bool z)              { set_flag(PCDESC_reexecute, z); }
 80 
 81   // Does pd refer to the same information as pd?
 82   bool is_same_info(const PcDesc* pd) {
 83     return _scope_decode_offset == pd->_scope_decode_offset &&
 84       _obj_decode_offset == pd->_obj_decode_offset &&
 85       _flags == pd->_flags;
 86   }
 87 
 88   bool     is_method_handle_invoke()       const { return (_flags & PCDESC_is_method_handle_invoke) != 0;     }
 89   void set_is_method_handle_invoke(bool z)       { set_flag(PCDESC_is_method_handle_invoke, z); }
 90 
 91   bool     return_oop()                    const { return (_flags & PCDESC_return_oop) != 0;     }
 92   void set_return_oop(bool z)                    { set_flag(PCDESC_return_oop, z); }
 93 


 94   // Indicates if there are objects in scope that, based on escape analysis, are local to the
 95   // compiled method or local to the current thread, i.e. NoEscape or ArgEscape
 96   bool     has_ea_local_in_scope()         const { return (_flags & PCDESC_has_ea_local_in_scope) != 0; }
 97   void set_has_ea_local_in_scope(bool z)         { set_flag(PCDESC_has_ea_local_in_scope, z); }
 98 
 99   // Indicates if this pc descriptor is at a call site where objects that do not escape the
100   // current thread are passed as arguments.
101   bool     arg_escape()                    const { return (_flags & PCDESC_arg_escape) != 0; }
102   void set_arg_escape(bool z)                    { set_flag(PCDESC_arg_escape, z); }
103 
104   // Returns the real pc
105   address real_pc(const CompiledMethod* code) const;
106 
107   void print(CompiledMethod* code) { print_on(tty, code); }
108   void print_on(outputStream* st, CompiledMethod* code);
109   bool verify(CompiledMethod* code);
110 };
111 
112 #endif // SHARE_CODE_PCDESC_HPP

 27 
 28 
 29 // PcDescs map a physical PC (given as offset from start of nmethod) to
 30 // the corresponding source scope and byte code index.
 31 
 32 class CompiledMethod;
 33 
 34 class PcDesc {
 35   friend class VMStructs;
 36  private:
 37   int _pc_offset;           // offset from start of nmethod
 38   int _scope_decode_offset; // offset for scope in nmethod
 39   int _obj_decode_offset;
 40 
 41   enum {
 42     PCDESC_reexecute                 = 1 << 0,
 43     PCDESC_is_method_handle_invoke   = 1 << 1,
 44     PCDESC_return_oop                = 1 << 2,
 45     PCDESC_rethrow_exception         = 1 << 3,
 46     PCDESC_has_ea_local_in_scope     = 1 << 4,
 47     PCDESC_arg_escape                = 1 << 5,
 48     PCDESC_return_scalarized         = 1 << 6
 49   };
 50 
 51   int _flags;
 52 
 53   void set_flag(int mask, bool z) {
 54     _flags = z ? (_flags | mask) : (_flags & ~mask);
 55   }
 56 
 57  public:
 58   int pc_offset() const           { return _pc_offset;   }
 59   int scope_decode_offset() const { return _scope_decode_offset; }
 60   int obj_decode_offset() const   { return _obj_decode_offset; }
 61 
 62   void set_pc_offset(int x)           { _pc_offset           = x; }
 63   void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
 64   void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }
 65 
 66   // Constructor (only used for static in nmethod.cpp)
 67   // Also used by ScopeDesc::sender()]
 68   PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);

 75 
 76   // Flags
 77   bool     rethrow_exception()              const { return (_flags & PCDESC_rethrow_exception) != 0; }
 78   void set_rethrow_exception(bool z)              { set_flag(PCDESC_rethrow_exception, z); }
 79   bool     should_reexecute()              const { return (_flags & PCDESC_reexecute) != 0; }
 80   void set_should_reexecute(bool z)              { set_flag(PCDESC_reexecute, z); }
 81 
 82   // Does pd refer to the same information as pd?
 83   bool is_same_info(const PcDesc* pd) {
 84     return _scope_decode_offset == pd->_scope_decode_offset &&
 85       _obj_decode_offset == pd->_obj_decode_offset &&
 86       _flags == pd->_flags;
 87   }
 88 
 89   bool     is_method_handle_invoke()       const { return (_flags & PCDESC_is_method_handle_invoke) != 0;     }
 90   void set_is_method_handle_invoke(bool z)       { set_flag(PCDESC_is_method_handle_invoke, z); }
 91 
 92   bool     return_oop()                    const { return (_flags & PCDESC_return_oop) != 0;     }
 93   void set_return_oop(bool z)                    { set_flag(PCDESC_return_oop, z); }
 94 
 95   bool     return_scalarized()             const { return (_flags & PCDESC_return_scalarized) != 0; }
 96   void set_return_scalarized(bool z)             { set_flag(PCDESC_return_scalarized, z); }
 97   // Indicates if there are objects in scope that, based on escape analysis, are local to the
 98   // compiled method or local to the current thread, i.e. NoEscape or ArgEscape
 99   bool     has_ea_local_in_scope()         const { return (_flags & PCDESC_has_ea_local_in_scope) != 0; }
100   void set_has_ea_local_in_scope(bool z)         { set_flag(PCDESC_has_ea_local_in_scope, z); }
101 
102   // Indicates if this pc descriptor is at a call site where objects that do not escape the
103   // current thread are passed as arguments.
104   bool     arg_escape()                    const { return (_flags & PCDESC_arg_escape) != 0; }
105   void set_arg_escape(bool z)                    { set_flag(PCDESC_arg_escape, z); }
106 
107   // Returns the real pc
108   address real_pc(const CompiledMethod* code) const;
109 
110   void print(CompiledMethod* code) { print_on(tty, code); }
111   void print_on(outputStream* st, CompiledMethod* code);
112   bool verify(CompiledMethod* code);
113 };
114 
115 #endif // SHARE_CODE_PCDESC_HPP
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