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 21 * 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 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; 46 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; } 51 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; } 55 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); 59 60 enum { 61 // upper and lower exclusive limits real offsets: 62 lower_offset_limit = -1, 63 upper_offset_limit = (unsigned int)-1 >> 1 64 }; 65 66 // Flags 67 bool should_reexecute() const { return _flags.bits.reexecute; } 68 void set_should_reexecute(bool z) { _flags.bits.reexecute = z; } 69 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 } 76 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; } 79 80 bool return_oop() const { return _flags.bits.return_oop; } 81 void set_return_oop(bool z) { _flags.bits.return_oop = z; } 82 83 // Returns the real pc 84 address real_pc(const nmethod* code) const; 85 86 void print(nmethod* code); 87 bool verify(nmethod* code); 88 };