duke@435: /*
cfang@1366:  * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // PcDescs map a physical PC (given as offset from start of nmethod) to
duke@435: // the corresponding source scope and byte code index.
duke@435: 
duke@435: class nmethod;
duke@435: 
duke@435: class PcDesc VALUE_OBJ_CLASS_SPEC {
duke@435:   friend class VMStructs;
duke@435:  private:
duke@435:   int _pc_offset;           // offset from start of nmethod
duke@435:   int _scope_decode_offset; // offset for scope in nmethod
duke@435:   int _obj_decode_offset;
duke@435: 
cfang@1366:   union PcDescFlags {
cfang@1366:     int word;
cfang@1366:     struct {
cfang@1366:       unsigned int reexecute: 1;
cfang@1366:     } bits;
never@1449:     bool operator ==(const PcDescFlags& other) { return word == other.word; }
cfang@1366:   } _flags;
cfang@1366: 
duke@435:  public:
duke@435:   int pc_offset() const           { return _pc_offset;   }
duke@435:   int scope_decode_offset() const { return _scope_decode_offset; }
duke@435:   int obj_decode_offset() const   { return _obj_decode_offset; }
duke@435: 
duke@435:   void set_pc_offset(int x)           { _pc_offset           = x; }
duke@435:   void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
duke@435:   void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }
duke@435: 
duke@435:   // Constructor (only used for static in nmethod.cpp)
duke@435:   // Also used by ScopeDesc::sender()]
duke@435:   PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
duke@435: 
duke@435:   enum {
duke@435:     // upper and lower exclusive limits real offsets:
duke@435:     lower_offset_limit = -1,
duke@435:     upper_offset_limit = (unsigned int)-1 >> 1
duke@435:   };
duke@435: 
cfang@1366:   // Flags
cfang@1366:   bool     should_reexecute()              const { return _flags.bits.reexecute; }
cfang@1366:   void set_should_reexecute(bool z)              { _flags.bits.reexecute = z;    }
cfang@1366: 
never@1449:   // Does pd refer to the same information as pd?
never@1449:   bool is_same_info(const PcDesc* pd) {
never@1449:     return _scope_decode_offset == pd->_scope_decode_offset &&
never@1449:       _obj_decode_offset == pd->_obj_decode_offset &&
never@1449:       _flags == pd->_flags;
never@1449:   }
never@1449: 
duke@435:   // Returns the real pc
duke@435:   address real_pc(const nmethod* code) const;
duke@435: 
duke@435:   void print(nmethod* code);
duke@435:   bool verify(nmethod* code);
duke@435: };