jdk8-mips64-public/hotspot: src/share/vm/code/pcDesc.hpp@e9ff18c4ace7

     1 /*

     2  * Copyright (c) 1997, 2009, 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

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    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       unsigned int return_oop: 1;

    43     } bits;

    44     bool operator ==(const PcDescFlags& other) { return word == other.word; }

    45   } _flags;

    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; }

    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; }

    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);

    60   enum {

    61     // upper and lower exclusive limits real offsets:

    62     lower_offset_limit = -1,

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

    64   };

    66   // Flags

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

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

    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   }

    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; }

    80   bool     return_oop()                    const { return _flags.bits.return_oop;     }

    81   void set_return_oop(bool z)                    {        _flags.bits.return_oop = z; }

    83   // Returns the real pc

    84   address real_pc(const nmethod* code) const;

    86   void print(nmethod* code);

    87   bool verify(nmethod* code);

    88 };

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