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, bool return_vt) { 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 _return_vt = return_vt; 41 decode_body(); 42 } 43 44 ScopeDesc::ScopeDesc(const CompiledMethod* code, int decode_offset, bool reexecute, bool rethrow_exception, bool return_oop, bool return_vt) { 45 _code = code; 46 _decode_offset = decode_offset; 47 _objects = decode_object_values(DebugInformationRecorder::serialized_null); 48 _reexecute = reexecute; 49 _rethrow_exception = rethrow_exception; 50 _return_oop = return_oop; 51 _return_vt = return_vt; 52 decode_body(); 53 } 54 55 56 ScopeDesc::ScopeDesc(const ScopeDesc* parent) { 57 _code = parent->_code; 58 _decode_offset = parent->_sender_decode_offset; 59 _objects = parent->_objects; 60 _reexecute = false; //reexecute only applies to the first scope 61 _rethrow_exception = false; 62 _return_oop = false; 63 _return_vt = false; 64 decode_body(); 65 } 66 67 68 void ScopeDesc::decode_body() { 69 if (decode_offset() == DebugInformationRecorder::serialized_null) { 70 // This is a sentinel record, which is only relevant to 71 // approximate queries. Decode a reasonable frame. 72 _sender_decode_offset = DebugInformationRecorder::serialized_null; 73 _method = _code->method(); 74 _bci = InvocationEntryBci; 75 _locals_decode_offset = DebugInformationRecorder::serialized_null; 76 _expressions_decode_offset = DebugInformationRecorder::serialized_null; 77 _monitors_decode_offset = DebugInformationRecorder::serialized_null; 78 } else { 79 // decode header 80 DebugInfoReadStream* stream = stream_at(decode_offset()); 81 82 _sender_decode_offset = stream->read_int(); 83 _method = stream->read_method(); 84 _bci = stream->read_bci(); 85 86 // decode offsets for body and sender 87 _locals_decode_offset = stream->read_int(); 88 _expressions_decode_offset = stream->read_int(); 89 _monitors_decode_offset = stream->read_int(); 90 } 91 } 92 93 94 GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) { 95 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 96 DebugInfoReadStream* stream = stream_at(decode_offset); 97 int length = stream->read_int(); 98 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length); 99 for (int index = 0; index < length; index++) { 100 result->push(ScopeValue::read_from(stream)); 101 } 102 return result; 103 } 104 105 GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) { 106 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 107 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>(); 108 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result); 109 int length = stream->read_int(); 110 for (int index = 0; index < length; index++) { 111 // Objects values are pushed to 'result' array during read so that 112 // object's fields could reference it (OBJECT_ID_CODE). 113 (void)ScopeValue::read_from(stream); 114 } 115 assert(result->length() == length, "inconsistent debug information"); 116 return result; 117 } 118 119 120 GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) { 121 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL; 122 DebugInfoReadStream* stream = stream_at(decode_offset); 123 int length = stream->read_int(); 124 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length); 125 for (int index = 0; index < length; index++) { 126 result->push(new MonitorValue(stream)); 127 } 128 return result; 129 } 130 131 DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const { 132 return new DebugInfoReadStream(_code, decode_offset, _objects); 133 } 134 135 GrowableArray<ScopeValue*>* ScopeDesc::locals() { 136 return decode_scope_values(_locals_decode_offset); 137 } 138 139 GrowableArray<ScopeValue*>* ScopeDesc::expressions() { 140 return decode_scope_values(_expressions_decode_offset); 141 } 142 143 GrowableArray<MonitorValue*>* ScopeDesc::monitors() { 144 return decode_monitor_values(_monitors_decode_offset); 145 } 146 147 GrowableArray<ScopeValue*>* ScopeDesc::objects() { 148 return _objects; 149 } 150 151 bool ScopeDesc::is_top() const { 152 return _sender_decode_offset == DebugInformationRecorder::serialized_null; 153 } 154 155 ScopeDesc* ScopeDesc::sender() const { 156 if (is_top()) return NULL; 157 return new ScopeDesc(this); 158 } 159 160 161 #ifndef PRODUCT 162 163 void ScopeDesc::print_value_on(outputStream* st) const { 164 st->print(" "); 165 method()->print_short_name(st); 166 int lineno = method()->line_number_from_bci(bci()); 167 if (lineno != -1) { 168 st->print("@%d (line %d)", bci(), lineno); 169 } else { 170 st->print("@%d", bci()); 171 } 172 if (should_reexecute()) { 173 st->print(" reexecute=true"); 174 } 175 st->cr(); 176 } 177 178 void ScopeDesc::print_on(outputStream* st) const { 179 print_on(st, NULL); 180 } 181 182 void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const { 183 // header 184 if (pd != NULL) { 185 st->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", p2i(pd->real_pc(_code)), pd->pc_offset()); 186 } 187 188 print_value_on(st); 189 // decode offsets 190 if (WizardMode) { 191 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, p2i(_code->content_begin())); 192 st->print_cr(" offset: %d", _decode_offset); 193 st->print_cr(" bci: %d", bci()); 194 st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false"); 195 st->print_cr(" locals: %d", _locals_decode_offset); 196 st->print_cr(" stack: %d", _expressions_decode_offset); 197 st->print_cr(" monitor: %d", _monitors_decode_offset); 198 st->print_cr(" sender: %d", _sender_decode_offset); 199 } 200 // locals 201 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals(); 202 if (l != NULL) { 203 st->print_cr(" Locals"); 204 for (int index = 0; index < l->length(); index++) { 205 st->print(" - l%d: ", index); 206 l->at(index)->print_on(st); 207 st->cr(); 208 } 209 } 210 } 211 // expressions 212 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions(); 213 if (l != NULL) { 214 st->print_cr(" Expression stack"); 215 for (int index = 0; index < l->length(); index++) { 216 st->print(" - @%d: ", index); 217 l->at(index)->print_on(st); 218 st->cr(); 219 } 220 } 221 } 222 // monitors 223 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors(); 224 if (l != NULL) { 225 st->print_cr(" Monitor stack"); 226 for (int index = 0; index < l->length(); index++) { 227 st->print(" - @%d: ", index); 228 l->at(index)->print_on(st); 229 st->cr(); 230 } 231 } 232 } 233 234 #if defined(COMPILER2) || INCLUDE_JVMCI 235 if (NOT_JVMCI(DoEscapeAnalysis &&) is_top() && _objects != NULL) { 236 st->print_cr(" Objects"); 237 for (int i = 0; i < _objects->length(); i++) { 238 ObjectValue* sv = (ObjectValue*) _objects->at(i); 239 st->print(" - %d: ", sv->id()); 240 st->print("%s ", java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())->external_name()); 241 sv->print_fields_on(st); 242 st->cr(); 243 } 244 } 245 #endif // COMPILER2 || INCLUDE_JVMCI 246 } 247 248 #endif 249 250 void ScopeDesc::verify() { 251 ResourceMark rm; 252 guarantee(method()->is_method(), "type check"); 253 254 // check if we have any illegal elements on the expression stack 255 { GrowableArray<ScopeValue*>* l = expressions(); 256 if (l != NULL) { 257 for (int index = 0; index < l->length(); index++) { 258 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal"); 259 } 260 } 261 } 262 }