1 /* 2 * Copyright (c) 2005, 2023, 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 "classfile/symbolTable.hpp" 27 #include "interpreter/bytecodeStream.hpp" 28 #include "memory/universe.hpp" 29 #include "oops/constantPool.inline.hpp" 30 #include "oops/fieldStreams.inline.hpp" 31 #include "oops/instanceKlass.inline.hpp" 32 #include "oops/recordComponent.hpp" 33 #include "prims/jvmtiClassFileReconstituter.hpp" 34 #include "runtime/handles.inline.hpp" 35 #include "runtime/signature.hpp" 36 #include "utilities/bytes.hpp" 37 #include "utilities/checkedCast.hpp" 38 39 // FIXME: add Deprecated attribute 40 // FIXME: fix Synthetic attribute 41 // FIXME: per Serguei, add error return handling for ConstantPool::copy_cpool_bytes() 42 43 JvmtiConstantPoolReconstituter::JvmtiConstantPoolReconstituter(InstanceKlass* ik) { 44 set_error(JVMTI_ERROR_NONE); 45 _ik = ik; 46 _cpool = constantPoolHandle(Thread::current(), ik->constants()); 47 _symmap = new ConstantPool::SymbolHash(); 48 _classmap = new ConstantPool::SymbolHash(); 49 _cpool_size = _cpool->hash_entries_to(_symmap, _classmap); 50 if (_cpool_size == 0) { 51 set_error(JVMTI_ERROR_OUT_OF_MEMORY); 52 } else if (_cpool_size < 0) { 53 set_error(JVMTI_ERROR_INTERNAL); 54 } 55 } 56 57 // Write the field information portion of ClassFile structure 58 // JVMSpec| u2 fields_count; 59 // JVMSpec| field_info fields[fields_count]; 60 void JvmtiClassFileReconstituter::write_field_infos() { 61 HandleMark hm(thread()); 62 Array<AnnotationArray*>* fields_anno = ik()->fields_annotations(); 63 Array<AnnotationArray*>* fields_type_anno = ik()->fields_type_annotations(); 64 65 // Compute the real number of Java fields 66 int java_fields = ik()->java_fields_count(); 67 68 write_u2(checked_cast<u2>(java_fields)); 69 for (JavaFieldStream fs(ik()); !fs.done(); fs.next()) { 70 AccessFlags access_flags = fs.access_flags(); 71 u2 name_index = fs.name_index(); 72 u2 signature_index = fs.signature_index(); 73 u2 initial_value_index = fs.initval_index(); 74 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field"); 75 // int offset = ik()->field_offset( index ); 76 u2 generic_signature_index = fs.generic_signature_index(); 77 AnnotationArray* anno = fields_anno == nullptr ? nullptr : fields_anno->at(fs.index()); 78 AnnotationArray* type_anno = fields_type_anno == nullptr ? nullptr : fields_type_anno->at(fs.index()); 79 80 // JVMSpec| field_info { 81 // JVMSpec| u2 access_flags; 82 // JVMSpec| u2 name_index; 83 // JVMSpec| u2 descriptor_index; 84 // JVMSpec| u2 attributes_count; 85 // JVMSpec| attribute_info attributes[attributes_count]; 86 // JVMSpec| } 87 88 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_FIELD_MODIFIERS); 89 write_u2(name_index); 90 write_u2(signature_index); 91 u2 attr_count = 0; 92 if (initial_value_index != 0) { 93 ++attr_count; 94 } 95 if (access_flags.is_synthetic()) { 96 // ++attr_count; 97 } 98 if (generic_signature_index != 0) { 99 ++attr_count; 100 } 101 if (anno != nullptr) { 102 ++attr_count; // has RuntimeVisibleAnnotations attribute 103 } 104 if (type_anno != nullptr) { 105 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute 106 } 107 108 write_u2(attr_count); 109 110 if (initial_value_index != 0) { 111 write_attribute_name_index("ConstantValue"); 112 write_u4(2); //length always 2 113 write_u2(initial_value_index); 114 } 115 if (access_flags.is_synthetic()) { 116 // write_synthetic_attribute(); 117 } 118 if (generic_signature_index != 0) { 119 write_signature_attribute(generic_signature_index); 120 } 121 if (anno != nullptr) { 122 write_annotations_attribute("RuntimeVisibleAnnotations", "RuntimeInvisibleAnnotations", anno); 123 } 124 if (type_anno != nullptr) { 125 write_annotations_attribute("RuntimeVisibleTypeAnnotations", "RuntimeInvisibleTypeAnnotations", type_anno); 126 } 127 } 128 } 129 130 // Write Code attribute 131 // JVMSpec| Code_attribute { 132 // JVMSpec| u2 attribute_name_index; 133 // JVMSpec| u4 attribute_length; 134 // JVMSpec| u2 max_stack; 135 // JVMSpec| u2 max_locals; 136 // JVMSpec| u4 code_length; 137 // JVMSpec| u1 code[code_length]; 138 // JVMSpec| u2 exception_table_length; 139 // JVMSpec| { u2 start_pc; 140 // JVMSpec| u2 end_pc; 141 // JVMSpec| u2 handler_pc; 142 // JVMSpec| u2 catch_type; 143 // JVMSpec| } exception_table[exception_table_length]; 144 // JVMSpec| u2 attributes_count; 145 // JVMSpec| attribute_info attributes[attributes_count]; 146 // JVMSpec| } 147 void JvmtiClassFileReconstituter::write_code_attribute(const methodHandle& method) { 148 ConstMethod* const_method = method->constMethod(); 149 u2 line_num_cnt = 0; 150 int stackmap_len = 0; 151 u2 local_variable_table_length = 0; 152 u2 local_variable_type_table_length = 0; 153 154 // compute number and length of attributes 155 u2 attr_count = 0; 156 int attr_size = 0; 157 if (const_method->has_linenumber_table()) { 158 line_num_cnt = line_number_table_entries(method); 159 if (line_num_cnt != 0) { 160 ++attr_count; 161 // Compute the complete size of the line number table attribute: 162 // LineNumberTable_attribute { 163 // u2 attribute_name_index; 164 // u4 attribute_length; 165 // u2 line_number_table_length; 166 // { u2 start_pc; 167 // u2 line_number; 168 // } line_number_table[line_number_table_length]; 169 // } 170 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2); 171 } 172 } 173 if (method->has_stackmap_table()) { 174 stackmap_len = method->stackmap_data()->length(); 175 if (stackmap_len != 0) { 176 ++attr_count; 177 // Compute the size of the stack map table attribute (VM stores raw): 178 // StackMapTable_attribute { 179 // u2 attribute_name_index; 180 // u4 attribute_length; 181 // u2 number_of_entries; 182 // stack_map_frame_entries[number_of_entries]; 183 // } 184 attr_size += 2 + 4 + stackmap_len; 185 } 186 } 187 if (method->has_localvariable_table()) { 188 local_variable_table_length = method->localvariable_table_length(); 189 if (local_variable_table_length != 0) { 190 ++attr_count; 191 // Compute the size of the local variable table attribute (VM stores raw): 192 // LocalVariableTable_attribute { 193 // u2 attribute_name_index; 194 // u4 attribute_length; 195 // u2 local_variable_table_length; 196 // { 197 // u2 start_pc; 198 // u2 length; 199 // u2 name_index; 200 // u2 descriptor_index; 201 // u2 index; 202 // } 203 attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2); 204 205 // Local variables with generic signatures must have LVTT entries 206 LocalVariableTableElement *elem = method->localvariable_table_start(); 207 for (int idx = 0; idx < local_variable_table_length; idx++) { 208 if (elem[idx].signature_cp_index != 0) { 209 local_variable_type_table_length++; 210 } 211 } 212 213 if (local_variable_type_table_length != 0) { 214 ++attr_count; 215 // Compute the size of the local variable type table attribute (VM stores raw): 216 // LocalVariableTypeTable_attribute { 217 // u2 attribute_name_index; 218 // u4 attribute_length; 219 // u2 local_variable_type_table_length; 220 // { 221 // u2 start_pc; 222 // u2 length; 223 // u2 name_index; 224 // u2 signature_index; 225 // u2 index; 226 // } 227 attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2); 228 } 229 } 230 } 231 232 ExceptionTable exception_table(method()); 233 u2 exception_table_length = exception_table.length(); 234 int code_size = const_method->code_size(); 235 int size = 236 2+2+4 + // max_stack, max_locals, code_length 237 code_size + // code 238 2 + // exception_table_length 239 (2+2+2+2) * exception_table_length + // exception_table 240 2 + // attributes_count 241 attr_size; // attributes 242 243 write_attribute_name_index("Code"); 244 write_u4(size); 245 write_u2(method->verifier_max_stack()); 246 write_u2(method->max_locals()); 247 write_u4(code_size); 248 copy_bytecodes(method, (unsigned char*)writeable_address(code_size)); 249 write_u2(exception_table_length); 250 for (int index = 0; index < exception_table_length; index++) { 251 write_u2(exception_table.start_pc(index)); 252 write_u2(exception_table.end_pc(index)); 253 write_u2(exception_table.handler_pc(index)); 254 write_u2(exception_table.catch_type_index(index)); 255 } 256 write_u2(attr_count); 257 if (line_num_cnt != 0) { 258 write_line_number_table_attribute(method, line_num_cnt); 259 } 260 if (stackmap_len != 0) { 261 write_stackmap_table_attribute(method, stackmap_len); 262 } 263 if (local_variable_table_length != 0) { 264 write_local_variable_table_attribute(method, local_variable_table_length); 265 } 266 if (local_variable_type_table_length != 0) { 267 write_local_variable_type_table_attribute(method, local_variable_type_table_length); 268 } 269 } 270 271 // Write Exceptions attribute 272 // JVMSpec| Exceptions_attribute { 273 // JVMSpec| u2 attribute_name_index; 274 // JVMSpec| u4 attribute_length; 275 // JVMSpec| u2 number_of_exceptions; 276 // JVMSpec| u2 exception_index_table[number_of_exceptions]; 277 // JVMSpec| } 278 void JvmtiClassFileReconstituter::write_exceptions_attribute(ConstMethod* const_method) { 279 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start(); 280 u2 checked_exceptions_length = const_method->checked_exceptions_length(); 281 int size = 282 2 + // number_of_exceptions 283 2 * checked_exceptions_length; // exception_index_table 284 285 write_attribute_name_index("Exceptions"); 286 write_u4(size); 287 write_u2(checked_exceptions_length); 288 for (int index = 0; index < checked_exceptions_length; index++) { 289 write_u2(checked_exceptions[index].class_cp_index); 290 } 291 } 292 293 // Write MethodParameters attribute 294 // JVMSpec| MethodParameters_attribute { 295 // JVMSpec| u2 attribute_name_index; 296 // JVMSpec| u4 attribute_length; 297 // JVMSpec| u1 parameters_count; 298 // JVMSpec| { u2 name_index; 299 // JVMSpec| u2 access_flags; 300 // JVMSpec| } parameters[parameters_count]; 301 // JVMSpec| } 302 void JvmtiClassFileReconstituter::write_method_parameter_attribute(const ConstMethod* const_method) { 303 const MethodParametersElement *parameters = const_method->method_parameters_start(); 304 int length = const_method->method_parameters_length(); 305 assert(length <= max_jubyte, "must fit u1"); 306 int size = 1 // parameters_count 307 + (2 + 2) * length; // parameters 308 309 write_attribute_name_index("MethodParameters"); 310 write_u4(size); 311 write_u1((u1)length); 312 for (int index = 0; index < length; index++) { 313 write_u2(parameters[index].name_cp_index); 314 write_u2(parameters[index].flags); 315 } 316 } 317 318 // Write SourceFile attribute 319 // JVMSpec| SourceFile_attribute { 320 // JVMSpec| u2 attribute_name_index; 321 // JVMSpec| u4 attribute_length; 322 // JVMSpec| u2 sourcefile_index; 323 // JVMSpec| } 324 void JvmtiClassFileReconstituter::write_source_file_attribute() { 325 assert(ik()->source_file_name() != nullptr, "caller must check"); 326 327 write_attribute_name_index("SourceFile"); 328 write_u4(2); // always length 2 329 write_u2(symbol_to_cpool_index(ik()->source_file_name())); 330 } 331 332 // Write SourceDebugExtension attribute 333 // JSR45| SourceDebugExtension_attribute { 334 // JSR45| u2 attribute_name_index; 335 // JSR45| u4 attribute_length; 336 // JSR45| u1 debug_extension[attribute_length]; 337 // JSR45| } 338 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() { 339 assert(ik()->source_debug_extension() != nullptr, "caller must check"); 340 341 write_attribute_name_index("SourceDebugExtension"); 342 int len = (int)strlen(ik()->source_debug_extension()); 343 write_u4(len); 344 u1* ext = (u1*)ik()->source_debug_extension(); 345 for (int i=0; i<len; i++) { 346 write_u1(ext[i]); 347 } 348 } 349 350 // Write (generic) Signature attribute 351 // JVMSpec| Signature_attribute { 352 // JVMSpec| u2 attribute_name_index; 353 // JVMSpec| u4 attribute_length; 354 // JVMSpec| u2 signature_index; 355 // JVMSpec| } 356 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) { 357 write_attribute_name_index("Signature"); 358 write_u4(2); // always length 2 359 write_u2(generic_signature_index); 360 } 361 362 // Compute the number of entries in the InnerClasses attribute 363 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() { 364 InnerClassesIterator iter(ik()); 365 return checked_cast<u2>(iter.length()); 366 } 367 368 // Write an annotation attribute. The VM stores them in raw form, so all we need 369 // to do is add the attribute name and fill in the length. 370 // JSR202| *Annotations_attribute { 371 // JSR202| u2 attribute_name_index; 372 // JSR202| u4 attribute_length; 373 // JSR202| ... 374 // JSR202| } 375 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name, 376 AnnotationArray* annos) { 377 u4 length = annos->length(); 378 write_attribute_name_index(attr_name); 379 write_u4(length); 380 memcpy(writeable_address(length), annos->adr_at(0), length); 381 } 382 383 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name, 384 const char* fallback_attr_name, 385 AnnotationArray* annos) { 386 TempNewSymbol sym = SymbolTable::probe(attr_name, (int)strlen(attr_name)); 387 if (sym != nullptr) { 388 if (symbol_to_cpool_index(sym) != 0) { 389 write_annotations_attribute(attr_name, annos); 390 return; 391 } 392 } 393 // use fallback name 394 write_annotations_attribute(fallback_attr_name, annos); 395 } 396 397 // BootstrapMethods_attribute { 398 // u2 attribute_name_index; 399 // u4 attribute_length; 400 // u2 num_bootstrap_methods; 401 // { u2 bootstrap_method_ref; 402 // u2 num_bootstrap_arguments; 403 // u2 bootstrap_arguments[num_bootstrap_arguments]; 404 // } bootstrap_methods[num_bootstrap_methods]; 405 // } 406 void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() { 407 Array<u2>* operands = cpool()->operands(); 408 write_attribute_name_index("BootstrapMethods"); 409 int num_bootstrap_methods = ConstantPool::operand_array_length(operands); 410 411 // calculate length of attribute 412 u4 length = sizeof(u2); // num_bootstrap_methods 413 for (int n = 0; n < num_bootstrap_methods; n++) { 414 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n); 415 length += sizeof(u2); // bootstrap_method_ref 416 length += sizeof(u2); // num_bootstrap_arguments 417 length += (u4)sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments] 418 } 419 write_u4(length); 420 421 // write attribute 422 write_u2(checked_cast<u2>(num_bootstrap_methods)); 423 for (int n = 0; n < num_bootstrap_methods; n++) { 424 u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n); 425 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n); 426 write_u2(bootstrap_method_ref); 427 write_u2(num_bootstrap_arguments); 428 for (int arg = 0; arg < num_bootstrap_arguments; arg++) { 429 u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg); 430 write_u2(bootstrap_argument); 431 } 432 } 433 } 434 435 // NestHost_attribute { 436 // u2 attribute_name_index; 437 // u4 attribute_length; 438 // u2 host_class_index; 439 // } 440 void JvmtiClassFileReconstituter::write_nest_host_attribute() { 441 int length = sizeof(u2); 442 u2 host_class_index = ik()->nest_host_index(); 443 444 write_attribute_name_index("NestHost"); 445 write_u4(length); 446 write_u2(host_class_index); 447 } 448 449 // NestMembers_attribute { 450 // u2 attribute_name_index; 451 // u4 attribute_length; 452 // u2 number_of_classes; 453 // u2 classes[number_of_classes]; 454 // } 455 void JvmtiClassFileReconstituter::write_nest_members_attribute() { 456 Array<u2>* nest_members = ik()->nest_members(); 457 int number_of_classes = nest_members->length(); 458 int length = sizeof(u2) * (1 + number_of_classes); 459 460 write_attribute_name_index("NestMembers"); 461 write_u4(length); 462 write_u2(checked_cast<u2>(number_of_classes)); 463 for (int i = 0; i < number_of_classes; i++) { 464 u2 class_cp_index = nest_members->at(i); 465 write_u2(class_cp_index); 466 } 467 } 468 469 // PermittedSubclasses { 470 // u2 attribute_name_index; 471 // u4 attribute_length; 472 // u2 number_of_classes; 473 // u2 classes[number_of_classes]; 474 // } 475 void JvmtiClassFileReconstituter::write_permitted_subclasses_attribute() { 476 Array<u2>* permitted_subclasses = ik()->permitted_subclasses(); 477 int number_of_classes = permitted_subclasses->length(); 478 int length = sizeof(u2) * (1 + number_of_classes); // '1 +' is for number_of_classes field 479 480 write_attribute_name_index("PermittedSubclasses"); 481 write_u4(length); 482 write_u2(checked_cast<u2>(number_of_classes)); 483 for (int i = 0; i < number_of_classes; i++) { 484 u2 class_cp_index = permitted_subclasses->at(i); 485 write_u2(class_cp_index); 486 } 487 } 488 489 // Record { 490 // u2 attribute_name_index; 491 // u4 attribute_length; 492 // u2 components_count; 493 // component_info components[components_count]; 494 // } 495 // component_info { 496 // u2 name_index; 497 // u2 descriptor_index 498 // u2 attributes_count; 499 // attribute_info_attributes[attributes_count]; 500 // } 501 void JvmtiClassFileReconstituter::write_record_attribute() { 502 Array<RecordComponent*>* components = ik()->record_components(); 503 int number_of_components = components->length(); 504 505 // Each component has a u2 for name, descr, attribute count 506 u4 length = checked_cast<u4>(sizeof(u2) + (sizeof(u2) * 3 * number_of_components)); 507 for (int x = 0; x < number_of_components; x++) { 508 RecordComponent* component = components->at(x); 509 if (component->generic_signature_index() != 0) { 510 length += 8; // Signature attribute size 511 } 512 if (component->annotations() != nullptr) { 513 length += 6 + component->annotations()->length(); 514 } 515 if (component->type_annotations() != nullptr) { 516 length += 6 + component->type_annotations()->length(); 517 } 518 } 519 520 write_attribute_name_index("Record"); 521 write_u4(length); 522 write_u2(checked_cast<u2>(number_of_components)); 523 for (int i = 0; i < number_of_components; i++) { 524 RecordComponent* component = components->at(i); 525 write_u2(component->name_index()); 526 write_u2(component->descriptor_index()); 527 u2 attributes_count = (component->generic_signature_index() != 0 ? 1 : 0) 528 + (component->annotations() != nullptr ? 1 : 0) 529 + (component->type_annotations() != nullptr ? 1 : 0); 530 531 write_u2(attributes_count); 532 if (component->generic_signature_index() != 0) { 533 write_signature_attribute(component->generic_signature_index()); 534 } 535 if (component->annotations() != nullptr) { 536 write_annotations_attribute("RuntimeVisibleAnnotations", "RuntimeInvisibleAnnotations", component->annotations()); 537 } 538 if (component->type_annotations() != nullptr) { 539 write_annotations_attribute("RuntimeVisibleTypeAnnotations", "RuntimeInvisibleTypeAnnotations", component->type_annotations()); 540 } 541 } 542 } 543 544 // Write InnerClasses attribute 545 // JVMSpec| InnerClasses_attribute { 546 // JVMSpec| u2 attribute_name_index; 547 // JVMSpec| u4 attribute_length; 548 // JVMSpec| u2 number_of_classes; 549 // JVMSpec| { u2 inner_class_info_index; 550 // JVMSpec| u2 outer_class_info_index; 551 // JVMSpec| u2 inner_name_index; 552 // JVMSpec| u2 inner_class_access_flags; 553 // JVMSpec| } classes[number_of_classes]; 554 // JVMSpec| } 555 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) { 556 InnerClassesIterator iter(ik()); 557 guarantee(iter.length() != 0 && iter.length() == length, 558 "caller must check"); 559 u2 entry_count = checked_cast<u2>(length / InstanceKlass::inner_class_next_offset); 560 u4 size = 2 + entry_count * (2+2+2+2); 561 562 write_attribute_name_index("InnerClasses"); 563 write_u4(size); 564 write_u2(entry_count); 565 for (; !iter.done(); iter.next()) { 566 write_u2(iter.inner_class_info_index()); 567 write_u2(iter.outer_class_info_index()); 568 write_u2(iter.inner_name_index()); 569 write_u2(iter.inner_access_flags()); 570 } 571 } 572 573 // Write Synthetic attribute 574 // JVMSpec| Synthetic_attribute { 575 // JVMSpec| u2 attribute_name_index; 576 // JVMSpec| u4 attribute_length; 577 // JVMSpec| } 578 void JvmtiClassFileReconstituter::write_synthetic_attribute() { 579 write_attribute_name_index("Synthetic"); 580 write_u4(0); //length always zero 581 } 582 583 // Compute size of LineNumberTable 584 u2 JvmtiClassFileReconstituter::line_number_table_entries(const methodHandle& method) { 585 // The line number table is compressed so we don't know how big it is until decompressed. 586 // Decompression is really fast so we just do it twice. 587 u2 num_entries = 0; 588 CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); 589 while (stream.read_pair()) { 590 num_entries++; 591 } 592 return num_entries; 593 } 594 595 // Write LineNumberTable attribute 596 // JVMSpec| LineNumberTable_attribute { 597 // JVMSpec| u2 attribute_name_index; 598 // JVMSpec| u4 attribute_length; 599 // JVMSpec| u2 line_number_table_length; 600 // JVMSpec| { u2 start_pc; 601 // JVMSpec| u2 line_number; 602 // JVMSpec| } line_number_table[line_number_table_length]; 603 // JVMSpec| } 604 void JvmtiClassFileReconstituter::write_line_number_table_attribute(const methodHandle& method, 605 u2 num_entries) { 606 607 write_attribute_name_index("LineNumberTable"); 608 write_u4(2 + num_entries * (2 + 2)); 609 write_u2(num_entries); 610 611 CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); 612 while (stream.read_pair()) { 613 write_u2(checked_cast<u2>(stream.bci())); 614 write_u2(checked_cast<u2>(stream.line())); 615 } 616 } 617 618 // Write LocalVariableTable attribute 619 // JVMSpec| LocalVariableTable_attribute { 620 // JVMSpec| u2 attribute_name_index; 621 // JVMSpec| u4 attribute_length; 622 // JVMSpec| u2 local_variable_table_length; 623 // JVMSpec| { u2 start_pc; 624 // JVMSpec| u2 length; 625 // JVMSpec| u2 name_index; 626 // JVMSpec| u2 descriptor_index; 627 // JVMSpec| u2 index; 628 // JVMSpec| } local_variable_table[local_variable_table_length]; 629 // JVMSpec| } 630 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(const methodHandle& method, u2 num_entries) { 631 write_attribute_name_index("LocalVariableTable"); 632 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); 633 write_u2(num_entries); 634 635 assert(method->localvariable_table_length() == num_entries, "just checking"); 636 637 LocalVariableTableElement *elem = method->localvariable_table_start(); 638 for (int j=0; j<method->localvariable_table_length(); j++) { 639 write_u2(elem->start_bci); 640 write_u2(elem->length); 641 write_u2(elem->name_cp_index); 642 write_u2(elem->descriptor_cp_index); 643 write_u2(elem->slot); 644 elem++; 645 } 646 } 647 648 // Write LocalVariableTypeTable attribute 649 // JVMSpec| LocalVariableTypeTable_attribute { 650 // JVMSpec| u2 attribute_name_index; 651 // JVMSpec| u4 attribute_length; 652 // JVMSpec| u2 local_variable_type_table_length; 653 // JVMSpec| { u2 start_pc; 654 // JVMSpec| u2 length; 655 // JVMSpec| u2 name_index; 656 // JVMSpec| u2 signature_index; 657 // JVMSpec| u2 index; 658 // JVMSpec| } local_variable_type_table[local_variable_type_table_length]; 659 // JVMSpec| } 660 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries) { 661 write_attribute_name_index("LocalVariableTypeTable"); 662 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); 663 write_u2(num_entries); 664 665 LocalVariableTableElement *elem = method->localvariable_table_start(); 666 for (int j=0; j<method->localvariable_table_length(); j++) { 667 if (elem->signature_cp_index > 0) { 668 // Local variable has a generic signature - write LVTT attribute entry 669 write_u2(elem->start_bci); 670 write_u2(elem->length); 671 write_u2(elem->name_cp_index); 672 write_u2(elem->signature_cp_index); 673 write_u2(elem->slot); 674 num_entries--; 675 } 676 elem++; 677 } 678 assert(num_entries == 0, "just checking"); 679 } 680 681 // Write stack map table attribute 682 // JSR-202| StackMapTable_attribute { 683 // JSR-202| u2 attribute_name_index; 684 // JSR-202| u4 attribute_length; 685 // JSR-202| u2 number_of_entries; 686 // JSR-202| stack_map_frame_entries[number_of_entries]; 687 // JSR-202| } 688 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(const methodHandle& method, 689 int stackmap_len) { 690 691 write_attribute_name_index("StackMapTable"); 692 write_u4(stackmap_len); 693 memcpy( 694 writeable_address(stackmap_len), 695 (void*)(method->stackmap_data()->adr_at(0)), 696 stackmap_len); 697 } 698 699 // Write one method_info structure 700 // JVMSpec| method_info { 701 // JVMSpec| u2 access_flags; 702 // JVMSpec| u2 name_index; 703 // JVMSpec| u2 descriptor_index; 704 // JVMSpec| u2 attributes_count; 705 // JVMSpec| attribute_info attributes[attributes_count]; 706 // JVMSpec| } 707 void JvmtiClassFileReconstituter::write_method_info(const methodHandle& method) { 708 AccessFlags access_flags = method->access_flags(); 709 ConstMethod* const_method = method->constMethod(); 710 u2 generic_signature_index = const_method->generic_signature_index(); 711 AnnotationArray* anno = method->annotations(); 712 AnnotationArray* param_anno = method->parameter_annotations(); 713 AnnotationArray* default_anno = method->annotation_default(); 714 AnnotationArray* type_anno = method->type_annotations(); 715 716 // skip generated default interface methods 717 if (method->is_overpass()) { 718 return; 719 } 720 721 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS); 722 write_u2(const_method->name_index()); 723 write_u2(const_method->signature_index()); 724 725 // write attributes in the same order javac does, so we can test with byte for 726 // byte comparison 727 int attr_count = 0; 728 if (const_method->code_size() != 0) { 729 ++attr_count; // has Code attribute 730 } 731 if (const_method->has_checked_exceptions()) { 732 ++attr_count; // has Exceptions attribute 733 } 734 if (default_anno != nullptr) { 735 ++attr_count; // has AnnotationDefault attribute 736 } 737 if (const_method->has_method_parameters()) { 738 ++attr_count; // has MethodParameters attribute 739 } 740 // Deprecated attribute would go here 741 if (access_flags.is_synthetic()) { // FIXME 742 // ++attr_count; 743 } 744 if (generic_signature_index != 0) { 745 ++attr_count; 746 } 747 if (anno != nullptr) { 748 ++attr_count; // has RuntimeVisibleAnnotations attribute 749 } 750 if (param_anno != nullptr) { 751 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute 752 } 753 if (type_anno != nullptr) { 754 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute 755 } 756 757 write_u2(checked_cast<u2>(attr_count)); 758 if (const_method->code_size() > 0) { 759 write_code_attribute(method); 760 } 761 if (const_method->has_checked_exceptions()) { 762 write_exceptions_attribute(const_method); 763 } 764 if (default_anno != nullptr) { 765 write_annotations_attribute("AnnotationDefault", default_anno); 766 } 767 if (const_method->has_method_parameters()) { 768 write_method_parameter_attribute(const_method); 769 } 770 // Deprecated attribute would go here 771 if (access_flags.is_synthetic()) { 772 // write_synthetic_attribute(); 773 } 774 if (generic_signature_index != 0) { 775 write_signature_attribute(generic_signature_index); 776 } 777 if (anno != nullptr) { 778 write_annotations_attribute("RuntimeVisibleAnnotations", "RuntimeInvisibleAnnotations", anno); 779 } 780 if (param_anno != nullptr) { 781 write_annotations_attribute("RuntimeVisibleParameterAnnotations", "RuntimeInvisibleParameterAnnotations", param_anno); 782 } 783 if (type_anno != nullptr) { 784 write_annotations_attribute("RuntimeVisibleTypeAnnotations", "RuntimeInvisibleTypeAnnotations", type_anno); 785 } 786 } 787 788 // Write the class attributes portion of ClassFile structure 789 // JVMSpec| u2 attributes_count; 790 // JVMSpec| attribute_info attributes[attributes_count]; 791 void JvmtiClassFileReconstituter::write_class_attributes() { 792 u2 inner_classes_length = inner_classes_attribute_length(); 793 Symbol* generic_signature = ik()->generic_signature(); 794 AnnotationArray* anno = ik()->class_annotations(); 795 AnnotationArray* type_anno = ik()->class_type_annotations(); 796 797 u2 attr_count = 0; 798 if (generic_signature != nullptr) { 799 ++attr_count; 800 } 801 if (ik()->source_file_name() != nullptr) { 802 ++attr_count; 803 } 804 if (ik()->source_debug_extension() != nullptr) { 805 ++attr_count; 806 } 807 if (inner_classes_length > 0) { 808 ++attr_count; 809 } 810 if (anno != nullptr) { 811 ++attr_count; // has RuntimeVisibleAnnotations attribute 812 } 813 if (type_anno != nullptr) { 814 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute 815 } 816 if (cpool()->operands() != nullptr) { 817 ++attr_count; 818 } 819 if (ik()->nest_host_index() != 0) { 820 ++attr_count; 821 } 822 if (ik()->nest_members() != Universe::the_empty_short_array()) { 823 ++attr_count; 824 } 825 if (ik()->permitted_subclasses() != Universe::the_empty_short_array()) { 826 ++attr_count; 827 } 828 if (ik()->record_components() != nullptr) { 829 ++attr_count; 830 } 831 832 write_u2(attr_count); 833 834 if (generic_signature != nullptr) { 835 write_signature_attribute(symbol_to_cpool_index(generic_signature)); 836 } 837 if (ik()->source_file_name() != nullptr) { 838 write_source_file_attribute(); 839 } 840 if (ik()->source_debug_extension() != nullptr) { 841 write_source_debug_extension_attribute(); 842 } 843 if (anno != nullptr) { 844 write_annotations_attribute("RuntimeVisibleAnnotations", "RuntimeInvisibleAnnotations", anno); 845 } 846 if (type_anno != nullptr) { 847 write_annotations_attribute("RuntimeVisibleTypeAnnotations", "RuntimeInvisibleTypeAnnotations", type_anno); 848 } 849 if (ik()->nest_host_index() != 0) { 850 write_nest_host_attribute(); 851 } 852 if (ik()->nest_members() != Universe::the_empty_short_array()) { 853 write_nest_members_attribute(); 854 } 855 if (ik()->permitted_subclasses() != Universe::the_empty_short_array()) { 856 write_permitted_subclasses_attribute(); 857 } 858 if (ik()->record_components() != nullptr) { 859 write_record_attribute(); 860 } 861 if (cpool()->operands() != nullptr) { 862 write_bootstrapmethod_attribute(); 863 } 864 if (inner_classes_length > 0) { 865 write_inner_classes_attribute(inner_classes_length); 866 } 867 } 868 869 // Write the method information portion of ClassFile structure 870 // JVMSpec| u2 methods_count; 871 // JVMSpec| method_info methods[methods_count]; 872 void JvmtiClassFileReconstituter::write_method_infos() { 873 HandleMark hm(thread()); 874 Array<Method*>* methods = ik()->methods(); 875 int num_methods = methods->length(); 876 int num_overpass = 0; 877 878 // count the generated default interface methods 879 // these will not be re-created by write_method_info 880 // and should not be included in the total count 881 for (int index = 0; index < num_methods; index++) { 882 Method* method = methods->at(index); 883 if (method->is_overpass()) { 884 num_overpass++; 885 } 886 } 887 888 write_u2(checked_cast<u2>(num_methods - num_overpass)); 889 if (JvmtiExport::can_maintain_original_method_order()) { 890 int index; 891 int original_index; 892 intArray method_order(num_methods, num_methods, 0); 893 894 // invert the method order mapping 895 for (index = 0; index < num_methods; index++) { 896 original_index = ik()->method_ordering()->at(index); 897 assert(original_index >= 0 && original_index < num_methods, 898 "invalid original method index"); 899 method_order.at_put(original_index, index); 900 } 901 902 // write in original order 903 for (original_index = 0; original_index < num_methods; original_index++) { 904 index = method_order.at(original_index); 905 methodHandle method(thread(), methods->at(index)); 906 write_method_info(method); 907 } 908 } else { 909 // method order not preserved just dump the method infos 910 for (int index = 0; index < num_methods; index++) { 911 methodHandle method(thread(), methods->at(index)); 912 write_method_info(method); 913 } 914 } 915 } 916 917 void JvmtiClassFileReconstituter::write_class_file_format() { 918 ReallocMark(); 919 920 // JVMSpec| ClassFile { 921 // JVMSpec| u4 magic; 922 write_u4(0xCAFEBABE); 923 924 // JVMSpec| u2 minor_version; 925 // JVMSpec| u2 major_version; 926 write_u2(ik()->minor_version()); 927 u2 major = ik()->major_version(); 928 write_u2(major); 929 930 // JVMSpec| u2 constant_pool_count; 931 // JVMSpec| cp_info constant_pool[constant_pool_count-1]; 932 write_u2(checked_cast<u2>(cpool()->length())); 933 copy_cpool_bytes(writeable_address(cpool_size())); 934 935 // JVMSpec| u2 access_flags; 936 write_u2(ik()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS); 937 938 // JVMSpec| u2 this_class; 939 // JVMSpec| u2 super_class; 940 write_u2(class_symbol_to_cpool_index(ik()->name())); 941 Klass* super_class = ik()->super(); 942 write_u2(super_class == nullptr? 0 : // zero for java.lang.Object 943 class_symbol_to_cpool_index(super_class->name())); 944 945 // JVMSpec| u2 interfaces_count; 946 // JVMSpec| u2 interfaces[interfaces_count]; 947 Array<InstanceKlass*>* interfaces = ik()->local_interfaces(); 948 int num_interfaces = interfaces->length(); 949 write_u2(checked_cast<u2>(num_interfaces)); 950 for (int index = 0; index < num_interfaces; index++) { 951 HandleMark hm(thread()); 952 InstanceKlass* iik = interfaces->at(index); 953 write_u2(class_symbol_to_cpool_index(iik->name())); 954 } 955 956 // JVMSpec| u2 fields_count; 957 // JVMSpec| field_info fields[fields_count]; 958 write_field_infos(); 959 960 // JVMSpec| u2 methods_count; 961 // JVMSpec| method_info methods[methods_count]; 962 write_method_infos(); 963 964 // JVMSpec| u2 attributes_count; 965 // JVMSpec| attribute_info attributes[attributes_count]; 966 // JVMSpec| } /* end ClassFile 8? 967 write_class_attributes(); 968 } 969 970 address JvmtiClassFileReconstituter::writeable_address(size_t size) { 971 size_t used_size = _buffer_ptr - _buffer; 972 if (size + used_size >= _buffer_size) { 973 // compute the new buffer size: must be at least twice as big as before 974 // plus whatever new is being used; then convert to nice clean block boundary 975 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size 976 * initial_buffer_size; 977 978 // VM goes belly-up if the memory isn't available, so cannot do OOM processing 979 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size); 980 _buffer_size = new_buffer_size; 981 _buffer_ptr = _buffer + used_size; 982 } 983 u1* ret_ptr = _buffer_ptr; 984 _buffer_ptr += size; 985 return ret_ptr; 986 } 987 988 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) { 989 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name)); 990 assert(sym != nullptr, "attribute name symbol not found"); 991 u2 attr_name_index = symbol_to_cpool_index(sym); 992 assert(attr_name_index != 0, "attribute name symbol not in constant pool"); 993 write_u2(attr_name_index); 994 } 995 996 void JvmtiClassFileReconstituter::write_u1(u1 x) { 997 *writeable_address(1) = x; 998 } 999 1000 void JvmtiClassFileReconstituter::write_u2(u2 x) { 1001 Bytes::put_Java_u2(writeable_address(2), x); 1002 } 1003 1004 void JvmtiClassFileReconstituter::write_u4(u4 x) { 1005 Bytes::put_Java_u4(writeable_address(4), x); 1006 } 1007 1008 void JvmtiClassFileReconstituter::write_u8(u8 x) { 1009 Bytes::put_Java_u8(writeable_address(8), x); 1010 } 1011 1012 void JvmtiClassFileReconstituter::copy_bytecodes(const methodHandle& mh, 1013 unsigned char* bytecodes) { 1014 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes 1015 // and the breakpoint bytecode are converted to their original bytecodes. 1016 1017 BytecodeStream bs(mh); 1018 1019 unsigned char* p = bytecodes; 1020 Bytecodes::Code code; 1021 bool is_rewritten = mh->method_holder()->is_rewritten(); 1022 1023 while ((code = bs.next()) >= 0) { 1024 assert(Bytecodes::is_java_code(code), "sanity check"); 1025 assert(code != Bytecodes::_breakpoint, "sanity check"); 1026 1027 // length of bytecode (mnemonic + operands) 1028 address bcp = bs.bcp(); 1029 int len = bs.instruction_size(); 1030 assert(len > 0, "length must be > 0"); 1031 1032 // copy the bytecodes 1033 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code); 1034 if (len > 1) { 1035 memcpy(p+1, bcp+1, len-1); 1036 } 1037 1038 // During linking the get/put and invoke instructions are rewritten 1039 // with an index into the constant pool cache. The original constant 1040 // pool index must be returned to caller. Rewrite the index. 1041 if (is_rewritten && len > 1) { 1042 bool is_wide = false; 1043 switch (code) { 1044 case Bytecodes::_getstatic : // fall through 1045 case Bytecodes::_putstatic : // fall through 1046 case Bytecodes::_getfield : // fall through 1047 case Bytecodes::_putfield : { 1048 int field_index = Bytes::get_native_u2(bcp+1); 1049 u2 pool_index = mh->constants()->resolved_field_entry_at(field_index)->constant_pool_index(); 1050 assert(pool_index < mh->constants()->length(), "sanity check"); 1051 Bytes::put_Java_u2((address)(p+1), pool_index); // java byte ordering 1052 break; 1053 } 1054 case Bytecodes::_invokevirtual : // fall through 1055 case Bytecodes::_invokespecial : // fall through 1056 case Bytecodes::_invokestatic : // fall through 1057 case Bytecodes::_invokedynamic : // fall through 1058 case Bytecodes::_invokeinterface : { 1059 assert(len == 3 || 1060 (code == Bytecodes::_invokeinterface && len == 5) || 1061 (code == Bytecodes::_invokedynamic && len == 5), 1062 "sanity check"); 1063 1064 int cpci = Bytes::get_native_u2(bcp+1); 1065 bool is_invokedynamic = (code == Bytecodes::_invokedynamic); 1066 int pool_index; 1067 if (is_invokedynamic) { 1068 cpci = Bytes::get_native_u4(bcp+1); 1069 pool_index = mh->constants()->resolved_indy_entry_at(mh->constants()->decode_invokedynamic_index(cpci))->constant_pool_index(); 1070 } else { 1071 // cache cannot be pre-fetched since some classes won't have it yet 1072 pool_index = mh->constants()->resolved_method_entry_at(cpci)->constant_pool_index(); 1073 } 1074 assert(pool_index < mh->constants()->length(), "sanity check"); 1075 Bytes::put_Java_u2((address)(p+1), (u2)pool_index); // java byte ordering 1076 if (is_invokedynamic) *(p+3) = *(p+4) = 0; 1077 break; 1078 } 1079 case Bytecodes::_ldc_w: 1080 is_wide = true; // fall through 1081 case Bytecodes::_ldc: { 1082 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) { 1083 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1)); 1084 int i = mh->constants()->object_to_cp_index(cpci); 1085 assert(i < mh->constants()->length(), "sanity check"); 1086 if (is_wide) { 1087 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering 1088 } else { 1089 *(p+1) = (u1)i; 1090 } 1091 } 1092 break; 1093 } 1094 default: 1095 break; 1096 } 1097 } 1098 1099 p += len; 1100 } 1101 }