1 /*

     2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #ifndef SHARE_VM_CODE_PCDESC_HPP

    26 #define SHARE_VM_CODE_PCDESC_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 

    30 // PcDescs map a physical PC (given as offset from start of nmethod) to

    31 // the corresponding source scope and byte code index.

    32 

    33 class CompiledMethod;

    34 

    35 class PcDesc VALUE_OBJ_CLASS_SPEC {

    36   friend class VMStructs;

    37  private:

    38   int _pc_offset;           // offset from start of nmethod

    39   int _scope_decode_offset; // offset for scope in nmethod

    40   int _obj_decode_offset;

    41 

    42   enum {

    43     PCDESC_reexecute               = 1 << 0,

    44     PCDESC_is_method_handle_invoke = 1 << 1,

    45     PCDESC_return_oop              = 1 << 2,

    46     PCDESC_rethrow_exception       = 1 << 3

    47   };

    48 

    49   int _flags;

    50 

    51   void set_flag(int mask, bool z) {

    52     _flags = z ? (_flags | mask) : (_flags & ~mask);

    53   }

    54 

    55  public:

    56   int pc_offset() const           { return _pc_offset;   }

    57   int scope_decode_offset() const { return _scope_decode_offset; }

    58   int obj_decode_offset() const   { return _obj_decode_offset; }

    59 

    60   void set_pc_offset(int x)           { _pc_offset           = x; }

    61   void set_scope_decode_offset(int x) { _scope_decode_offset = x; }

    62   void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }

    63 

    64   // Constructor (only used for static in nmethod.cpp)

    65   // Also used by ScopeDesc::sender()]

    66   PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);

    67 

    68   enum {

    69     // upper and lower exclusive limits real offsets:

    70     lower_offset_limit = -1,

    71     upper_offset_limit = (unsigned int)-1 >> 1

    72   };

    73 

    74   // Flags

    75   bool     rethrow_exception()              const { return (_flags & PCDESC_rethrow_exception) != 0; }

    76   void set_rethrow_exception(bool z)              { set_flag(PCDESC_rethrow_exception, z); }

    77   bool     should_reexecute()              const { return (_flags & PCDESC_reexecute) != 0; }

    78   void set_should_reexecute(bool z)              { set_flag(PCDESC_reexecute, z); }

    79 

    80   // Does pd refer to the same information as pd?

    81   bool is_same_info(const PcDesc* pd) {

    82     return _scope_decode_offset == pd->_scope_decode_offset &&

    83       _obj_decode_offset == pd->_obj_decode_offset &&

    84       _flags == pd->_flags;

    85   }

    86 

    87   bool     is_method_handle_invoke()       const { return (_flags & PCDESC_is_method_handle_invoke) != 0;     }

    88   void set_is_method_handle_invoke(bool z)       { set_flag(PCDESC_is_method_handle_invoke, z); }

    89 

    90   bool     return_oop()                    const { return (_flags & PCDESC_return_oop) != 0;     }

    91   void set_return_oop(bool z)                    { set_flag(PCDESC_return_oop, z); }

    92 

    93   // Returns the real pc

    94   address real_pc(const CompiledMethod* code) const;

    95 

    96   void print(CompiledMethod* code);

    97   bool verify(CompiledMethod* code);

    98 };

    99 

   100 #endif // SHARE_VM_CODE_PCDESC_HPP