1 /* 2 * Copyright (c) 1997, 2016, 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 "precompiled.hpp" 26 #include "code/debugInfoRec.hpp" 27 #include "code/pcDesc.hpp" 28 #include "code/scopeDesc.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "oops/oop.inline.hpp" 31 #include "runtime/handles.inline.hpp" 32 33 ScopeDesc::ScopeDesc(const CompiledMethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool rethrow_exception, bool return_oop) { 34 _code = code; 35 _decode_offset = decode_offset; 36 _objects = decode_object_values(obj_decode_offset); 37 _reexecute = reexecute; 38 _rethrow_exception = rethrow_exception; 39 _return_oop = return_oop; 40 decode_body(); 41 } 42 43 ScopeDesc::ScopeDesc(const CompiledMethod* code, int decode_offset, bool reexecute, bool rethrow_exception, bool return_oop) { 44 _code = code; 45 _decode_offset = decode_offset; 46 _objects = decode_object_values(DebugInformationRecorder::serialized_null); 47 _reexecute = reexecute; 48 _rethrow_exception = rethrow_exception; 49 _return_oop = return_oop; 50 decode_body(); 51 } 52 53 54 ScopeDesc::ScopeDesc(const ScopeDesc* parent) { 55 _code = parent->_code; 56 _decode_offset = parent->_sender_decode_offset; 57 _objects = parent->_objects; 58 _reexecute = false; //reexecute only applies to the first scope 59 _rethrow_exception = false; 60 _return_oop = false; 61 decode_body(); 62 } 63 64 65 void ScopeDesc::decode_body() { 66 if (decode_offset() == DebugInformationRecorder::serialized_null) { 67 // This is a sentinel record, which is only relevant to 68 // approximate queries. Decode a reasonable frame. 69 _sender_decode_offset = DebugInformationRecorder::serialized_null; 70 _method = _code->method(); 71 _bci = InvocationEntryBci; 72 _locals_decode_offset = DebugInformationRecorder::serialized_null; 73 _expressions_decode_offset = DebugInformationRecorder::serialized_null; 74 _monitors_decode_offset = DebugInformationRecorder::serialized_null; 75 } else { 76 // decode header 77 DebugInfoReadStream* stream = stream_at(decode_offset()); 78 79 _sender_decode_offset = stream->read_int(); 80 _method = stream->read_method(); 81 _bci = stream->read_bci(); 82 83 // decode offsets for body and sender 84 _locals_decode_offset = stream->read_int(); 85 _expressions_decode_offset = stream->read_int(); 86 _monitors_decode_offset = stream->read_int(); 87 } 88 } 89 90 91 GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) { 92 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 93 DebugInfoReadStream* stream = stream_at(decode_offset); 94 int length = stream->read_int(); 95 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length); 96 for (int index = 0; index < length; index++) { 97 result->push(ScopeValue::read_from(stream)); 98 } 99 return result; 100 } 101 102 GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) { 103 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 104 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>(); 105 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result); 106 int length = stream->read_int(); 107 for (int index = 0; index < length; index++) { 108 // Objects values are pushed to 'result' array during read so that 109 // object's fields could reference it (OBJECT_ID_CODE). 110 (void)ScopeValue::read_from(stream); 111 } 112 assert(result->length() == length, "inconsistent debug information"); 113 return result; 114 } 115 116 117 GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) { 118 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 119 DebugInfoReadStream* stream = stream_at(decode_offset); 120 int length = stream->read_int(); 121 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length); 122 for (int index = 0; index < length; index++) { 123 result->push(new MonitorValue(stream)); 124 } 125 return result; 126 } 127 128 DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const { 129 return new DebugInfoReadStream(_code, decode_offset, _objects); 130 } 131 132 GrowableArray<ScopeValue*>* ScopeDesc::locals() { 133 return decode_scope_values(_locals_decode_offset); 134 } 135 136 GrowableArray<ScopeValue*>* ScopeDesc::expressions() { 137 return decode_scope_values(_expressions_decode_offset); 138 } 139 140 GrowableArray<MonitorValue*>* ScopeDesc::monitors() { 141 return decode_monitor_values(_monitors_decode_offset); 142 } 143 144 GrowableArray<ScopeValue*>* ScopeDesc::objects() { 145 return _objects; 146 } 147 148 bool ScopeDesc::is_top() const { 149 return _sender_decode_offset == DebugInformationRecorder::serialized_null; 150 } 151 152 ScopeDesc* ScopeDesc::sender() const { 153 if (is_top()) return NULL; 154 return new ScopeDesc(this); 155 } 156 157 158 #ifndef PRODUCT 159 160 void ScopeDesc::print_value_on(outputStream* st) const { 161 st->print(" "); 162 method()->print_short_name(st); 163 int lineno = method()->line_number_from_bci(bci()); 164 if (lineno != -1) { 165 st->print("@%d (line %d)", bci(), lineno); 166 } else { 167 st->print("@%d", bci()); 168 } 169 if (should_reexecute()) { 170 st->print(" reexecute=true"); 171 } 172 st->cr(); 173 } 174 175 void ScopeDesc::print_on(outputStream* st) const { 176 print_on(st, NULL); 177 } 178 179 void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const { 180 // header 181 if (pd != NULL) { 182 st->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", p2i(pd->real_pc(_code)), pd->pc_offset()); 183 } 184 185 print_value_on(st); 186 // decode offsets 187 if (WizardMode) { 188 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, p2i(_code->content_begin())); 189 st->print_cr(" offset: %d", _decode_offset); 190 st->print_cr(" bci: %d", bci()); 191 st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false"); 192 st->print_cr(" locals: %d", _locals_decode_offset); 193 st->print_cr(" stack: %d", _expressions_decode_offset); 194 st->print_cr(" monitor: %d", _monitors_decode_offset); 195 st->print_cr(" sender: %d", _sender_decode_offset); 196 } 197 // locals 198 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals(); 199 if (l != NULL) { 200 st->print_cr(" Locals"); 201 for (int index = 0; index < l->length(); index++) { 202 st->print(" - l%d: ", index); 203 l->at(index)->print_on(st); 204 st->cr(); 205 } 206 } 207 } 208 // expressions 209 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions(); 210 if (l != NULL) { 211 st->print_cr(" Expression 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 // monitors 220 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors(); 221 if (l != NULL) { 222 st->print_cr(" Monitor stack"); 223 for (int index = 0; index < l->length(); index++) { 224 st->print(" - @%d: ", index); 225 l->at(index)->print_on(st); 226 st->cr(); 227 } 228 } 229 } 230 231 #if defined(COMPILER2) || INCLUDE_JVMCI 232 if (NOT_JVMCI(DoEscapeAnalysis &&) is_top() && _objects != NULL) { 233 st->print_cr(" Objects"); 234 for (int i = 0; i < _objects->length(); i++) { 235 ObjectValue* sv = (ObjectValue*) _objects->at(i); 236 st->print(" - %d: ", sv->id()); 237 st->print("%s ", java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())->external_name()); 238 sv->print_fields_on(st); 239 st->cr(); 240 } 241 } 242 #endif // COMPILER2 || INCLUDE_JVMCI 243 } 244 245 #endif 246 247 void ScopeDesc::verify() { 248 ResourceMark rm; 249 guarantee(method()->is_method(), "type check"); 250 251 // check if we have any illegal elements on the expression stack 252 { GrowableArray<ScopeValue*>* l = expressions(); 253 if (l != NULL) { 254 for (int index = 0; index < l->length(); index++) { 255 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal"); 256 } 257 } 258 } 259 }