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 */ 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 union PcDescFlags { 38 int word; 39 struct { 40 unsigned int reexecute: 1; 41 } bits; 42 operator ==(const PcDescFlags& other) { return word == other.word; } 43 } _flags; 44 45 public: 46 int pc_offset() const { return _pc_offset; } 47 int scope_decode_offset() const { return _scope_decode_offset; } 48 int obj_decode_offset() const { return _obj_decode_offset; } 49 50 void set_pc_offset(int x) { _pc_offset = x; } 51 void set_scope_decode_offset(int x) { _scope_decode_offset = x; } 52 void set_obj_decode_offset(int x) { _obj_decode_offset = x; } 53 54 // Constructor (only used for static in nmethod.cpp) 55 // Also used by ScopeDesc::sender()] 56 PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset); 57 58 enum { 59 // upper and lower exclusive limits real offsets: 60 lower_offset_limit = -1, 61 upper_offset_limit = (unsigned int)-1 >> 1 62 }; 63 64 // Flags 65 bool should_reexecute() const { return _flags.bits.reexecute; } 66 void set_should_reexecute(bool z) { _flags.bits.reexecute = z; } 67 68 // Does pd refer to the same information as pd? 69 bool is_same_info(const PcDesc* pd) { 70 return _scope_decode_offset == pd->_scope_decode_offset && 71 _obj_decode_offset == pd->_obj_decode_offset && 72 _flags == pd->_flags; 73 } 74 75 // Returns the real pc 76 address real_pc(const nmethod* code) const; 77 78 void print(nmethod* code); 79 bool verify(nmethod* code); 80 };