jdk8-mips64-public/hotspot: src/share/vm/code/pcDesc.hpp@b1f619d38249

     1 /*

     2  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

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

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

    28 class nmethod;

    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;

    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;

    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; }

    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; }

    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);

    59   enum {

    60     // upper and lower exclusive limits real offsets:

    61     lower_offset_limit = -1,

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

    63   };

    65   // Flags

    66   bool     should_reexecute()              const { return _flags.bits.reexecute; }

    67   void set_should_reexecute(bool z)              { _flags.bits.reexecute = z;    }

    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   }

    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; }

    79   // Returns the real pc

    80   address real_pc(const nmethod* code) const;

    82   void print(nmethod* code);

    83   bool verify(nmethod* code);

    84 };

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