1 /*

     2  * Copyright 1997-2005 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  */

    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  public:

    38   int pc_offset() const           { return _pc_offset;   }

    39   int scope_decode_offset() const { return _scope_decode_offset; }

    40   int obj_decode_offset() const   { return _obj_decode_offset; }

    41 

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

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

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

    45 

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

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

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

    49 

    50   enum {

    51     // upper and lower exclusive limits real offsets:

    52     lower_offset_limit = -1,

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

    54   };

    55 

    56   // Returns the real pc

    57   address real_pc(const nmethod* code) const;

    58 

    59   void print(nmethod* code);

    60   bool verify(nmethod* code);

    61 };