scopeDesc.cpp revision 1472:c18cbe5936b8
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# include "incls/_precompiled.incl" 26# include "incls/_scopeDesc.cpp.incl" 27 28 29ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool return_oop) { 30 _code = code; 31 _decode_offset = decode_offset; 32 _objects = decode_object_values(obj_decode_offset); 33 _reexecute = reexecute; 34 _return_oop = return_oop; 35 decode_body(); 36} 37 38ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, bool reexecute, bool return_oop) { 39 _code = code; 40 _decode_offset = decode_offset; 41 _objects = decode_object_values(DebugInformationRecorder::serialized_null); 42 _reexecute = reexecute; 43 _return_oop = return_oop; 44 decode_body(); 45} 46 47 48ScopeDesc::ScopeDesc(const ScopeDesc* parent) { 49 _code = parent->_code; 50 _decode_offset = parent->_sender_decode_offset; 51 _objects = parent->_objects; 52 _reexecute = false; //reexecute only applies to the first scope 53 _return_oop = false; 54 decode_body(); 55} 56 57 58void ScopeDesc::decode_body() { 59 if (decode_offset() == DebugInformationRecorder::serialized_null) { 60 // This is a sentinel record, which is only relevant to 61 // approximate queries. Decode a reasonable frame. 62 _sender_decode_offset = DebugInformationRecorder::serialized_null; 63 _method = methodHandle(_code->method()); 64 _bci = InvocationEntryBci; 65 _locals_decode_offset = DebugInformationRecorder::serialized_null; 66 _expressions_decode_offset = DebugInformationRecorder::serialized_null; 67 _monitors_decode_offset = DebugInformationRecorder::serialized_null; 68 } else { 69 // decode header 70 DebugInfoReadStream* stream = stream_at(decode_offset()); 71 72 _sender_decode_offset = stream->read_int(); 73 _method = methodHandle((methodOop) stream->read_oop()); 74 _bci = stream->read_bci(); 75 76 // decode offsets for body and sender 77 _locals_decode_offset = stream->read_int(); 78 _expressions_decode_offset = stream->read_int(); 79 _monitors_decode_offset = stream->read_int(); 80 } 81} 82 83 84GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) { 85 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 86 DebugInfoReadStream* stream = stream_at(decode_offset); 87 int length = stream->read_int(); 88 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length); 89 for (int index = 0; index < length; index++) { 90 result->push(ScopeValue::read_from(stream)); 91 } 92 return result; 93} 94 95GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) { 96 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 97 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>(); 98 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result); 99 int length = stream->read_int(); 100 for (int index = 0; index < length; index++) { 101 // Objects values are pushed to 'result' array during read so that 102 // object's fields could reference it (OBJECT_ID_CODE). 103 (void)ScopeValue::read_from(stream); 104 } 105 assert(result->length() == length, "inconsistent debug information"); 106 return result; 107} 108 109 110GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) { 111 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 112 DebugInfoReadStream* stream = stream_at(decode_offset); 113 int length = stream->read_int(); 114 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length); 115 for (int index = 0; index < length; index++) { 116 result->push(new MonitorValue(stream)); 117 } 118 return result; 119} 120 121DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const { 122 return new DebugInfoReadStream(_code, decode_offset, _objects); 123} 124 125GrowableArray<ScopeValue*>* ScopeDesc::locals() { 126 return decode_scope_values(_locals_decode_offset); 127} 128 129GrowableArray<ScopeValue*>* ScopeDesc::expressions() { 130 return decode_scope_values(_expressions_decode_offset); 131} 132 133GrowableArray<MonitorValue*>* ScopeDesc::monitors() { 134 return decode_monitor_values(_monitors_decode_offset); 135} 136 137GrowableArray<ScopeValue*>* ScopeDesc::objects() { 138 return _objects; 139} 140 141bool ScopeDesc::is_top() const { 142 return _sender_decode_offset == DebugInformationRecorder::serialized_null; 143} 144 145ScopeDesc* ScopeDesc::sender() const { 146 if (is_top()) return NULL; 147 return new ScopeDesc(this); 148} 149 150 151#ifndef PRODUCT 152 153void ScopeDesc::print_value_on(outputStream* st) const { 154 tty->print(" "); 155 method()()->print_short_name(st); 156 int lineno = method()->line_number_from_bci(bci()); 157 if (lineno != -1) { 158 st->print_cr("@%d (line %d)", bci(), lineno); 159 } else { 160 st->print_cr("@%d", bci()); 161 } 162} 163 164void ScopeDesc::print_on(outputStream* st) const { 165 print_on(st, NULL); 166} 167 168void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const { 169 // header 170 if (pd != NULL) { 171 tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset()); 172 } 173 174 print_value_on(st); 175 // decode offsets 176 if (WizardMode) { 177 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->instructions_begin()); 178 st->print_cr(" offset: %d", _decode_offset); 179 st->print_cr(" bci: %d", bci()); 180 st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false"); 181 st->print_cr(" locals: %d", _locals_decode_offset); 182 st->print_cr(" stack: %d", _expressions_decode_offset); 183 st->print_cr(" monitor: %d", _monitors_decode_offset); 184 st->print_cr(" sender: %d", _sender_decode_offset); 185 } 186 // locals 187 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals(); 188 if (l != NULL) { 189 tty->print_cr(" Locals"); 190 for (int index = 0; index < l->length(); index++) { 191 st->print(" - l%d: ", index); 192 l->at(index)->print_on(st); 193 st->cr(); 194 } 195 } 196 } 197 // expressions 198 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions(); 199 if (l != NULL) { 200 st->print_cr(" Expression stack"); 201 for (int index = 0; index < l->length(); index++) { 202 st->print(" - @%d: ", index); 203 l->at(index)->print_on(st); 204 st->cr(); 205 } 206 } 207 } 208 // monitors 209 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors(); 210 if (l != NULL) { 211 st->print_cr(" Monitor stack"); 212 for (int index = 0; index < l->length(); index++) { 213 st->print(" - @%d: ", index); 214 l->at(index)->print_on(st); 215 st->cr(); 216 } 217 } 218 } 219 220#ifdef COMPILER2 221 if (DoEscapeAnalysis && is_top() && _objects != NULL) { 222 tty->print_cr("Objects"); 223 for (int i = 0; i < _objects->length(); i++) { 224 ObjectValue* sv = (ObjectValue*) _objects->at(i); 225 tty->print(" - %d: ", sv->id()); 226 sv->print_fields_on(tty); 227 tty->cr(); 228 } 229 } 230#endif // COMPILER2 231} 232 233#endif 234 235void ScopeDesc::verify() { 236 ResourceMark rm; 237 guarantee(method()->is_method(), "type check"); 238 239 // check if we have any illegal elements on the expression stack 240 { GrowableArray<ScopeValue*>* l = expressions(); 241 if (l != NULL) { 242 for (int index = 0; index < l->length(); index++) { 243 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal"); 244 } 245 } 246 } 247} 248