1 /* 2 * Copyright (c) 2005, 2013, 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 "oops/fieldStreams.hpp" 29 #include "prims/jvmtiClassFileReconstituter.hpp" 30 #include "runtime/signature.hpp" 31 #ifdef TARGET_ARCH_x86 32 # include "bytes_x86.hpp" 33 #endif 34 #ifdef TARGET_ARCH_sparc 35 # include "bytes_sparc.hpp" 36 #endif 37 #ifdef TARGET_ARCH_zero 38 # include "bytes_zero.hpp" 39 #endif 40 #ifdef TARGET_ARCH_arm 41 # include "bytes_arm.hpp" 42 #endif 43 #ifdef TARGET_ARCH_ppc 44 # include "bytes_ppc.hpp" 45 #endif 46 // FIXME: add Deprecated attribute 47 // FIXME: fix Synthetic attribute 48 // FIXME: per Serguei, add error return handling for ConstantPool::copy_cpool_bytes() 49 50 51 // Write the field information portion of ClassFile structure 52 // JVMSpec| u2 fields_count; 53 // JVMSpec| field_info fields[fields_count]; 54 void JvmtiClassFileReconstituter::write_field_infos() { 55 HandleMark hm(thread()); 56 Array<AnnotationArray*>* fields_anno = ikh()->fields_annotations(); 57 Array<AnnotationArray*>* fields_type_anno = ikh()->fields_type_annotations(); 58 59 // Compute the real number of Java fields 60 int java_fields = ikh()->java_fields_count(); 61 62 write_u2(java_fields); 63 for (JavaFieldStream fs(ikh()); !fs.done(); fs.next()) { 64 AccessFlags access_flags = fs.access_flags(); 65 int name_index = fs.name_index(); 66 int signature_index = fs.signature_index(); 67 int initial_value_index = fs.initval_index(); 68 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field"); 69 // int offset = ikh()->field_offset( index ); 70 int generic_signature_index = fs.generic_signature_index(); 71 AnnotationArray* anno = fields_anno == NULL ? NULL : fields_anno->at(fs.index()); 72 AnnotationArray* type_anno = fields_type_anno == NULL ? NULL : fields_type_anno->at(fs.index()); 73 74 // JVMSpec| field_info { 75 // JVMSpec| u2 access_flags; 76 // JVMSpec| u2 name_index; 77 // JVMSpec| u2 descriptor_index; 78 // JVMSpec| u2 attributes_count; 79 // JVMSpec| attribute_info attributes[attributes_count]; 80 // JVMSpec| } 81 82 write_u2(access_flags.as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS); 83 write_u2(name_index); 84 write_u2(signature_index); 85 int attr_count = 0; 86 if (initial_value_index != 0) { 87 ++attr_count; 88 } 89 if (access_flags.is_synthetic()) { 90 // ++attr_count; 91 } 92 if (generic_signature_index != 0) { 93 ++attr_count; 94 } 95 if (anno != NULL) { 96 ++attr_count; // has RuntimeVisibleAnnotations attribute 97 } 98 if (type_anno != NULL) { 99 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute 100 } 101 102 write_u2(attr_count); 103 104 if (initial_value_index != 0) { 105 write_attribute_name_index("ConstantValue"); 106 write_u4(2); //length always 2 107 write_u2(initial_value_index); 108 } 109 if (access_flags.is_synthetic()) { 110 // write_synthetic_attribute(); 111 } 112 if (generic_signature_index != 0) { 113 write_signature_attribute(generic_signature_index); 114 } 115 if (anno != NULL) { 116 write_annotations_attribute("RuntimeVisibleAnnotations", anno); 117 } 118 if (type_anno != NULL) { 119 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno); 120 } 121 } 122 } 123 124 // Write Code attribute 125 // JVMSpec| Code_attribute { 126 // JVMSpec| u2 attribute_name_index; 127 // JVMSpec| u4 attribute_length; 128 // JVMSpec| u2 max_stack; 129 // JVMSpec| u2 max_locals; 130 // JVMSpec| u4 code_length; 131 // JVMSpec| u1 code[code_length]; 132 // JVMSpec| u2 exception_table_length; 133 // JVMSpec| { u2 start_pc; 134 // JVMSpec| u2 end_pc; 135 // JVMSpec| u2 handler_pc; 136 // JVMSpec| u2 catch_type; 137 // JVMSpec| } exception_table[exception_table_length]; 138 // JVMSpec| u2 attributes_count; 139 // JVMSpec| attribute_info attributes[attributes_count]; 140 // JVMSpec| } 141 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) { 142 ConstMethod* const_method = method->constMethod(); 143 u2 line_num_cnt = 0; 144 int stackmap_len = 0; 145 int local_variable_table_length = 0; 146 int local_variable_type_table_length = 0; 147 148 // compute number and length of attributes 149 int attr_count = 0; 150 int attr_size = 0; 151 if (const_method->has_linenumber_table()) { 152 line_num_cnt = line_number_table_entries(method); 153 if (line_num_cnt != 0) { 154 ++attr_count; 155 // Compute the complete size of the line number table attribute: 156 // LineNumberTable_attribute { 157 // u2 attribute_name_index; 158 // u4 attribute_length; 159 // u2 line_number_table_length; 160 // { u2 start_pc; 161 // u2 line_number; 162 // } line_number_table[line_number_table_length]; 163 // } 164 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2); 165 } 166 } 167 if (method->has_stackmap_table()) { 168 stackmap_len = method->stackmap_data()->length(); 169 if (stackmap_len != 0) { 170 ++attr_count; 171 // Compute the size of the stack map table attribute (VM stores raw): 172 // StackMapTable_attribute { 173 // u2 attribute_name_index; 174 // u4 attribute_length; 175 // u2 number_of_entries; 176 // stack_map_frame_entries[number_of_entries]; 177 // } 178 attr_size += 2 + 4 + stackmap_len; 179 } 180 } 181 if (method->has_localvariable_table()) { 182 local_variable_table_length = method->localvariable_table_length(); 183 if (local_variable_table_length != 0) { 184 ++attr_count; 185 // Compute the size of the local variable table attribute (VM stores raw): 186 // LocalVariableTable_attribute { 187 // u2 attribute_name_index; 188 // u4 attribute_length; 189 // u2 local_variable_table_length; 190 // { 191 // u2 start_pc; 192 // u2 length; 193 // u2 name_index; 194 // u2 descriptor_index; 195 // u2 index; 196 // } 197 attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2); 198 199 // Local variables with generic signatures must have LVTT entries 200 LocalVariableTableElement *elem = method->localvariable_table_start(); 201 for (int idx = 0; idx < local_variable_table_length; idx++) { 202 if (elem[idx].signature_cp_index != 0) { 203 local_variable_type_table_length++; 204 } 205 } 206 207 if (local_variable_type_table_length != 0) { 208 ++attr_count; 209 // Compute the size of the local variable type table attribute (VM stores raw): 210 // LocalVariableTypeTable_attribute { 211 // u2 attribute_name_index; 212 // u4 attribute_length; 213 // u2 local_variable_type_table_length; 214 // { 215 // u2 start_pc; 216 // u2 length; 217 // u2 name_index; 218 // u2 signature_index; 219 // u2 index; 220 // } 221 attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2); 222 } 223 } 224 } 225 226 ExceptionTable exception_table(method()); 227 int exception_table_length = exception_table.length(); 228 int code_size = const_method->code_size(); 229 int size = 230 2+2+4 + // max_stack, max_locals, code_length 231 code_size + // code 232 2 + // exception_table_length 233 (2+2+2+2) * exception_table_length + // exception_table 234 2 + // attributes_count 235 attr_size; // attributes 236 237 write_attribute_name_index("Code"); 238 write_u4(size); 239 write_u2(method->verifier_max_stack()); 240 write_u2(method->max_locals()); 241 write_u4(code_size); 242 copy_bytecodes(method, (unsigned char*)writeable_address(code_size)); 243 write_u2(exception_table_length); 244 for (int index = 0; index < exception_table_length; index++) { 245 write_u2(exception_table.start_pc(index)); 246 write_u2(exception_table.end_pc(index)); 247 write_u2(exception_table.handler_pc(index)); 248 write_u2(exception_table.catch_type_index(index)); 249 } 250 write_u2(attr_count); 251 if (line_num_cnt != 0) { 252 write_line_number_table_attribute(method, line_num_cnt); 253 } 254 if (stackmap_len != 0) { 255 write_stackmap_table_attribute(method, stackmap_len); 256 } 257 if (local_variable_table_length != 0) { 258 write_local_variable_table_attribute(method, local_variable_table_length); 259 } 260 if (local_variable_type_table_length != 0) { 261 write_local_variable_type_table_attribute(method, local_variable_type_table_length); 262 } 263 } 264 265 // Write Exceptions attribute 266 // JVMSpec| Exceptions_attribute { 267 // JVMSpec| u2 attribute_name_index; 268 // JVMSpec| u4 attribute_length; 269 // JVMSpec| u2 number_of_exceptions; 270 // JVMSpec| u2 exception_index_table[number_of_exceptions]; 271 // JVMSpec| } 272 void JvmtiClassFileReconstituter::write_exceptions_attribute(ConstMethod* const_method) { 273 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start(); 274 int checked_exceptions_length = const_method->checked_exceptions_length(); 275 int size = 276 2 + // number_of_exceptions 277 2 * checked_exceptions_length; // exception_index_table 278 279 write_attribute_name_index("Exceptions"); 280 write_u4(size); 281 write_u2(checked_exceptions_length); 282 for (int index = 0; index < checked_exceptions_length; index++) { 283 write_u2(checked_exceptions[index].class_cp_index); 284 } 285 } 286 287 // Write SourceFile attribute 288 // JVMSpec| SourceFile_attribute { 289 // JVMSpec| u2 attribute_name_index; 290 // JVMSpec| u4 attribute_length; 291 // JVMSpec| u2 sourcefile_index; 292 // JVMSpec| } 293 void JvmtiClassFileReconstituter::write_source_file_attribute() { 294 assert(ikh()->source_file_name() != NULL, "caller must check"); 295 296 write_attribute_name_index("SourceFile"); 297 write_u4(2); // always length 2 298 write_u2(symbol_to_cpool_index(ikh()->source_file_name())); 299 } 300 301 // Write SourceDebugExtension attribute 302 // JSR45| SourceDebugExtension_attribute { 303 // JSR45| u2 attribute_name_index; 304 // JSR45| u4 attribute_length; 305 // JSR45| u1 debug_extension[attribute_length]; 306 // JSR45| } 307 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() { 308 assert(ikh()->source_debug_extension() != NULL, "caller must check"); 309 310 write_attribute_name_index("SourceDebugExtension"); 311 int len = (int)strlen(ikh()->source_debug_extension()); 312 write_u4(len); 313 u1* ext = (u1*)ikh()->source_debug_extension(); 314 for (int i=0; i<len; i++) { 315 write_u1(ext[i]); 316 } 317 } 318 319 // Write (generic) Signature attribute 320 // JVMSpec| Signature_attribute { 321 // JVMSpec| u2 attribute_name_index; 322 // JVMSpec| u4 attribute_length; 323 // JVMSpec| u2 signature_index; 324 // JVMSpec| } 325 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) { 326 write_attribute_name_index("Signature"); 327 write_u4(2); // always length 2 328 write_u2(generic_signature_index); 329 } 330 331 // Compute the number of entries in the InnerClasses attribute 332 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() { 333 InnerClassesIterator iter(ikh()); 334 return iter.length(); 335 } 336 337 // Write an annotation attribute. The VM stores them in raw form, so all we need 338 // to do is add the attrubute name and fill in the length. 339 // JSR202| *Annotations_attribute { 340 // JSR202| u2 attribute_name_index; 341 // JSR202| u4 attribute_length; 342 // JSR202| ... 343 // JSR202| } 344 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name, 345 AnnotationArray* annos) { 346 u4 length = annos->length(); 347 write_attribute_name_index(attr_name); 348 write_u4(length); 349 memcpy(writeable_address(length), annos->adr_at(0), length); 350 } 351 352 // BootstrapMethods_attribute { 353 // u2 attribute_name_index; 354 // u4 attribute_length; 355 // u2 num_bootstrap_methods; 356 // { u2 bootstrap_method_ref; 357 // u2 num_bootstrap_arguments; 358 // u2 bootstrap_arguments[num_bootstrap_arguments]; 359 // } bootstrap_methods[num_bootstrap_methods]; 360 // } 361 void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() { 362 Array<u2>* operands = cpool()->operands(); 363 write_attribute_name_index("BootstrapMethods"); 364 int num_bootstrap_methods = ConstantPool::operand_array_length(operands); 365 366 // calculate length of attribute 367 int length = sizeof(u2); // num_bootstrap_methods 368 for (int n = 0; n < num_bootstrap_methods; n++) { 369 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n); 370 length += sizeof(u2); // bootstrap_method_ref 371 length += sizeof(u2); // num_bootstrap_arguments 372 length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments] 373 } 374 write_u4(length); 375 376 // write attribute 377 write_u2(num_bootstrap_methods); 378 for (int n = 0; n < num_bootstrap_methods; n++) { 379 u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n); 380 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n); 381 write_u2(bootstrap_method_ref); 382 write_u2(num_bootstrap_arguments); 383 for (int arg = 0; arg < num_bootstrap_arguments; arg++) { 384 u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg); 385 write_u2(bootstrap_argument); 386 } 387 } 388 } 389 390 391 // Write InnerClasses attribute 392 // JVMSpec| InnerClasses_attribute { 393 // JVMSpec| u2 attribute_name_index; 394 // JVMSpec| u4 attribute_length; 395 // JVMSpec| u2 number_of_classes; 396 // JVMSpec| { u2 inner_class_info_index; 397 // JVMSpec| u2 outer_class_info_index; 398 // JVMSpec| u2 inner_name_index; 399 // JVMSpec| u2 inner_class_access_flags; 400 // JVMSpec| } classes[number_of_classes]; 401 // JVMSpec| } 402 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) { 403 InnerClassesIterator iter(ikh()); 404 guarantee(iter.length() != 0 && iter.length() == length, 405 "caller must check"); 406 u2 entry_count = length / InstanceKlass::inner_class_next_offset; 407 u4 size = 2 + entry_count * (2+2+2+2); 408 409 write_attribute_name_index("InnerClasses"); 410 write_u4(size); 411 write_u2(entry_count); 412 for (; !iter.done(); iter.next()) { 413 write_u2(iter.inner_class_info_index()); 414 write_u2(iter.outer_class_info_index()); 415 write_u2(iter.inner_name_index()); 416 write_u2(iter.inner_access_flags()); 417 } 418 } 419 420 // Write Synthetic attribute 421 // JVMSpec| Synthetic_attribute { 422 // JVMSpec| u2 attribute_name_index; 423 // JVMSpec| u4 attribute_length; 424 // JVMSpec| } 425 void JvmtiClassFileReconstituter::write_synthetic_attribute() { 426 write_attribute_name_index("Synthetic"); 427 write_u4(0); //length always zero 428 } 429 430 // Compute size of LineNumberTable 431 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) { 432 // The line number table is compressed so we don't know how big it is until decompressed. 433 // Decompression is really fast so we just do it twice. 434 u2 num_entries = 0; 435 CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); 436 while (stream.read_pair()) { 437 num_entries++; 438 } 439 return num_entries; 440 } 441 442 // Write LineNumberTable attribute 443 // JVMSpec| LineNumberTable_attribute { 444 // JVMSpec| u2 attribute_name_index; 445 // JVMSpec| u4 attribute_length; 446 // JVMSpec| u2 line_number_table_length; 447 // JVMSpec| { u2 start_pc; 448 // JVMSpec| u2 line_number; 449 // JVMSpec| } line_number_table[line_number_table_length]; 450 // JVMSpec| } 451 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method, 452 u2 num_entries) { 453 454 write_attribute_name_index("LineNumberTable"); 455 write_u4(2 + num_entries * (2 + 2)); 456 write_u2(num_entries); 457 458 CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); 459 while (stream.read_pair()) { 460 write_u2(stream.bci()); 461 write_u2(stream.line()); 462 } 463 } 464 465 // Write LocalVariableTable attribute 466 // JVMSpec| LocalVariableTable_attribute { 467 // JVMSpec| u2 attribute_name_index; 468 // JVMSpec| u4 attribute_length; 469 // JVMSpec| u2 local_variable_table_length; 470 // JVMSpec| { u2 start_pc; 471 // JVMSpec| u2 length; 472 // JVMSpec| u2 name_index; 473 // JVMSpec| u2 descriptor_index; 474 // JVMSpec| u2 index; 475 // JVMSpec| } local_variable_table[local_variable_table_length]; 476 // JVMSpec| } 477 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) { 478 write_attribute_name_index("LocalVariableTable"); 479 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); 480 write_u2(num_entries); 481 482 assert(method->localvariable_table_length() == num_entries, "just checking"); 483 484 LocalVariableTableElement *elem = method->localvariable_table_start(); 485 for (int j=0; j<method->localvariable_table_length(); j++) { 486 write_u2(elem->start_bci); 487 write_u2(elem->length); 488 write_u2(elem->name_cp_index); 489 write_u2(elem->descriptor_cp_index); 490 write_u2(elem->slot); 491 elem++; 492 } 493 } 494 495 // Write LocalVariableTypeTable attribute 496 // JVMSpec| LocalVariableTypeTable_attribute { 497 // JVMSpec| u2 attribute_name_index; 498 // JVMSpec| u4 attribute_length; 499 // JVMSpec| u2 local_variable_type_table_length; 500 // JVMSpec| { u2 start_pc; 501 // JVMSpec| u2 length; 502 // JVMSpec| u2 name_index; 503 // JVMSpec| u2 signature_index; 504 // JVMSpec| u2 index; 505 // JVMSpec| } local_variable_type_table[local_variable_type_table_length]; 506 // JVMSpec| } 507 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(methodHandle method, u2 num_entries) { 508 write_attribute_name_index("LocalVariableTypeTable"); 509 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); 510 write_u2(num_entries); 511 512 LocalVariableTableElement *elem = method->localvariable_table_start(); 513 for (int j=0; j<method->localvariable_table_length(); j++) { 514 if (elem->signature_cp_index > 0) { 515 // Local variable has a generic signature - write LVTT attribute entry 516 write_u2(elem->start_bci); 517 write_u2(elem->length); 518 write_u2(elem->name_cp_index); 519 write_u2(elem->signature_cp_index); 520 write_u2(elem->slot); 521 num_entries--; 522 } 523 elem++; 524 } 525 assert(num_entries == 0, "just checking"); 526 } 527 528 // Write stack map table attribute 529 // JSR-202| StackMapTable_attribute { 530 // JSR-202| u2 attribute_name_index; 531 // JSR-202| u4 attribute_length; 532 // JSR-202| u2 number_of_entries; 533 // JSR-202| stack_map_frame_entries[number_of_entries]; 534 // JSR-202| } 535 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method, 536 int stackmap_len) { 537 538 write_attribute_name_index("StackMapTable"); 539 write_u4(stackmap_len); 540 memcpy( 541 writeable_address(stackmap_len), 542 (void*)(method->stackmap_data()->adr_at(0)), 543 stackmap_len); 544 } 545 546 // Write one method_info structure 547 // JVMSpec| method_info { 548 // JVMSpec| u2 access_flags; 549 // JVMSpec| u2 name_index; 550 // JVMSpec| u2 descriptor_index; 551 // JVMSpec| u2 attributes_count; 552 // JVMSpec| attribute_info attributes[attributes_count]; 553 // JVMSpec| } 554 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) { 555 AccessFlags access_flags = method->access_flags(); 556 ConstMethod* const_method = method->constMethod(); 557 u2 generic_signature_index = const_method->generic_signature_index(); 558 AnnotationArray* anno = method->annotations(); 559 AnnotationArray* param_anno = method->parameter_annotations(); 560 AnnotationArray* default_anno = method->annotation_default(); 561 AnnotationArray* type_anno = method->type_annotations(); 562 563 // skip generated default interface methods 564 if (method->is_overpass()) { 565 return; 566 } 567 568 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS); 569 write_u2(const_method->name_index()); 570 write_u2(const_method->signature_index()); 571 572 // write attributes in the same order javac does, so we can test with byte for 573 // byte comparison 574 int attr_count = 0; 575 if (const_method->code_size() != 0) { 576 ++attr_count; // has Code attribute 577 } 578 if (const_method->has_checked_exceptions()) { 579 ++attr_count; // has Exceptions attribute 580 } 581 if (default_anno != NULL) { 582 ++attr_count; // has AnnotationDefault attribute 583 } 584 // Deprecated attribute would go here 585 if (access_flags.is_synthetic()) { // FIXME 586 // ++attr_count; 587 } 588 if (generic_signature_index != 0) { 589 ++attr_count; 590 } 591 if (anno != NULL) { 592 ++attr_count; // has RuntimeVisibleAnnotations attribute 593 } 594 if (param_anno != NULL) { 595 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute 596 } 597 if (type_anno != NULL) { 598 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute 599 } 600 601 write_u2(attr_count); 602 if (const_method->code_size() > 0) { 603 write_code_attribute(method); 604 } 605 if (const_method->has_checked_exceptions()) { 606 write_exceptions_attribute(const_method); 607 } 608 if (default_anno != NULL) { 609 write_annotations_attribute("AnnotationDefault", default_anno); 610 } 611 // Deprecated attribute would go here 612 if (access_flags.is_synthetic()) { 613 // write_synthetic_attribute(); 614 } 615 if (generic_signature_index != 0) { 616 write_signature_attribute(generic_signature_index); 617 } 618 if (anno != NULL) { 619 write_annotations_attribute("RuntimeVisibleAnnotations", anno); 620 } 621 if (param_anno != NULL) { 622 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno); 623 } 624 if (type_anno != NULL) { 625 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno); 626 } 627 } 628 629 // Write the class attributes portion of ClassFile structure 630 // JVMSpec| u2 attributes_count; 631 // JVMSpec| attribute_info attributes[attributes_count]; 632 void JvmtiClassFileReconstituter::write_class_attributes() { 633 u2 inner_classes_length = inner_classes_attribute_length(); 634 Symbol* generic_signature = ikh()->generic_signature(); 635 AnnotationArray* anno = ikh()->class_annotations(); 636 AnnotationArray* type_anno = ikh()->class_type_annotations(); 637 638 int attr_count = 0; 639 if (generic_signature != NULL) { 640 ++attr_count; 641 } 642 if (ikh()->source_file_name() != NULL) { 643 ++attr_count; 644 } 645 if (ikh()->source_debug_extension() != NULL) { 646 ++attr_count; 647 } 648 if (inner_classes_length > 0) { 649 ++attr_count; 650 } 651 if (anno != NULL) { 652 ++attr_count; // has RuntimeVisibleAnnotations attribute 653 } 654 if (type_anno != NULL) { 655 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute 656 } 657 if (cpool()->operands() != NULL) { 658 ++attr_count; 659 } 660 661 write_u2(attr_count); 662 663 if (generic_signature != NULL) { 664 write_signature_attribute(symbol_to_cpool_index(generic_signature)); 665 } 666 if (ikh()->source_file_name() != NULL) { 667 write_source_file_attribute(); 668 } 669 if (ikh()->source_debug_extension() != NULL) { 670 write_source_debug_extension_attribute(); 671 } 672 if (inner_classes_length > 0) { 673 write_inner_classes_attribute(inner_classes_length); 674 } 675 if (anno != NULL) { 676 write_annotations_attribute("RuntimeVisibleAnnotations", anno); 677 } 678 if (type_anno != NULL) { 679 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno); 680 } 681 if (cpool()->operands() != NULL) { 682 write_bootstrapmethod_attribute(); 683 } 684 } 685 686 // Write the method information portion of ClassFile structure 687 // JVMSpec| u2 methods_count; 688 // JVMSpec| method_info methods[methods_count]; 689 void JvmtiClassFileReconstituter::write_method_infos() { 690 HandleMark hm(thread()); 691 Array<Method*>* methods = ikh()->methods(); 692 int num_methods = methods->length(); 693 int num_overpass = 0; 694 695 // count the generated default interface methods 696 // these will not be re-created by write_method_info 697 // and should not be included in the total count 698 for (int index = 0; index < num_methods; index++) { 699 Method* method = methods->at(index); 700 if (method->is_overpass()) { 701 num_overpass++; 702 } 703 } 704 705 write_u2(num_methods - num_overpass); 706 if (JvmtiExport::can_maintain_original_method_order()) { 707 int index; 708 int original_index; 709 intArray method_order(num_methods, 0); 710 711 // invert the method order mapping 712 for (index = 0; index < num_methods; index++) { 713 original_index = ikh()->method_ordering()->at(index); 714 assert(original_index >= 0 && original_index < num_methods, 715 "invalid original method index"); 716 method_order.at_put(original_index, index); 717 } 718 719 // write in original order 720 for (original_index = 0; original_index < num_methods; original_index++) { 721 index = method_order.at(original_index); 722 methodHandle method(thread(), methods->at(index)); 723 write_method_info(method); 724 } 725 } else { 726 // method order not preserved just dump the method infos 727 for (int index = 0; index < num_methods; index++) { 728 methodHandle method(thread(), methods->at(index)); 729 write_method_info(method); 730 } 731 } 732 } 733 734 void JvmtiClassFileReconstituter::write_class_file_format() { 735 ReallocMark(); 736 737 // JVMSpec| ClassFile { 738 // JVMSpec| u4 magic; 739 write_u4(0xCAFEBABE); 740 741 // JVMSpec| u2 minor_version; 742 // JVMSpec| u2 major_version; 743 write_u2(ikh()->minor_version()); 744 u2 major = ikh()->major_version(); 745 write_u2(major); 746 747 // JVMSpec| u2 constant_pool_count; 748 // JVMSpec| cp_info constant_pool[constant_pool_count-1]; 749 write_u2(cpool()->length()); 750 copy_cpool_bytes(writeable_address(cpool_size())); 751 752 // JVMSpec| u2 access_flags; 753 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS); 754 755 // JVMSpec| u2 this_class; 756 // JVMSpec| u2 super_class; 757 write_u2(class_symbol_to_cpool_index(ikh()->name())); 758 Klass* super_class = ikh()->super(); 759 write_u2(super_class == NULL? 0 : // zero for java.lang.Object 760 class_symbol_to_cpool_index(super_class->name())); 761 762 // JVMSpec| u2 interfaces_count; 763 // JVMSpec| u2 interfaces[interfaces_count]; 764 Array<Klass*>* interfaces = ikh()->local_interfaces(); 765 int num_interfaces = interfaces->length(); 766 write_u2(num_interfaces); 767 for (int index = 0; index < num_interfaces; index++) { 768 HandleMark hm(thread()); 769 instanceKlassHandle iikh(thread(), interfaces->at(index)); 770 write_u2(class_symbol_to_cpool_index(iikh->name())); 771 } 772 773 // JVMSpec| u2 fields_count; 774 // JVMSpec| field_info fields[fields_count]; 775 write_field_infos(); 776 777 // JVMSpec| u2 methods_count; 778 // JVMSpec| method_info methods[methods_count]; 779 write_method_infos(); 780 781 // JVMSpec| u2 attributes_count; 782 // JVMSpec| attribute_info attributes[attributes_count]; 783 // JVMSpec| } /* end ClassFile 8? 784 write_class_attributes(); 785 } 786 787 address JvmtiClassFileReconstituter::writeable_address(size_t size) { 788 size_t used_size = _buffer_ptr - _buffer; 789 if (size + used_size >= _buffer_size) { 790 // compute the new buffer size: must be at least twice as big as before 791 // plus whatever new is being used; then convert to nice clean block boundary 792 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size 793 * initial_buffer_size; 794 795 // VM goes belly-up if the memory isn't available, so cannot do OOM processing 796 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size); 797 _buffer_size = new_buffer_size; 798 _buffer_ptr = _buffer + used_size; 799 } 800 u1* ret_ptr = _buffer_ptr; 801 _buffer_ptr += size; 802 return ret_ptr; 803 } 804 805 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) { 806 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name)); 807 assert(sym != NULL, "attribute name symbol not found"); 808 u2 attr_name_index = symbol_to_cpool_index(sym); 809 assert(attr_name_index != 0, "attribute name symbol not in constant pool"); 810 write_u2(attr_name_index); 811 } 812 813 void JvmtiClassFileReconstituter::write_u1(u1 x) { 814 *writeable_address(1) = x; 815 } 816 817 void JvmtiClassFileReconstituter::write_u2(u2 x) { 818 Bytes::put_Java_u2(writeable_address(2), x); 819 } 820 821 void JvmtiClassFileReconstituter::write_u4(u4 x) { 822 Bytes::put_Java_u4(writeable_address(4), x); 823 } 824 825 void JvmtiClassFileReconstituter::write_u8(u8 x) { 826 Bytes::put_Java_u8(writeable_address(8), x); 827 } 828 829 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh, 830 unsigned char* bytecodes) { 831 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes 832 // and the breakpoint bytecode are converted to their original bytecodes. 833 834 BytecodeStream bs(mh); 835 836 unsigned char* p = bytecodes; 837 Bytecodes::Code code; 838 bool is_rewritten = mh->method_holder()->is_rewritten(); 839 840 while ((code = bs.next()) >= 0) { 841 assert(Bytecodes::is_java_code(code), "sanity check"); 842 assert(code != Bytecodes::_breakpoint, "sanity check"); 843 844 // length of bytecode (mnemonic + operands) 845 address bcp = bs.bcp(); 846 int len = bs.instruction_size(); 847 assert(len > 0, "length must be > 0"); 848 849 // copy the bytecodes 850 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code); 851 if (len > 1) { 852 memcpy(p+1, bcp+1, len-1); 853 } 854 855 // During linking the get/put and invoke instructions are rewritten 856 // with an index into the constant pool cache. The original constant 857 // pool index must be returned to caller. Rewrite the index. 858 if (is_rewritten && len > 1) { 859 bool is_wide = false; 860 switch (code) { 861 case Bytecodes::_getstatic : // fall through 862 case Bytecodes::_putstatic : // fall through 863 case Bytecodes::_getfield : // fall through 864 case Bytecodes::_putfield : // fall through 865 case Bytecodes::_invokevirtual : // fall through 866 case Bytecodes::_invokespecial : // fall through 867 case Bytecodes::_invokestatic : // fall through 868 case Bytecodes::_invokedynamic : // fall through 869 case Bytecodes::_invokeinterface : { 870 assert(len == 3 || 871 (code == Bytecodes::_invokeinterface && len == 5) || 872 (code == Bytecodes::_invokedynamic && len == 5), 873 "sanity check"); 874 875 int cpci = Bytes::get_native_u2(bcp+1); 876 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic); 877 ConstantPoolCacheEntry* entry; 878 if (is_invokedynamic) { 879 cpci = Bytes::get_native_u4(bcp+1); 880 entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci); 881 } else { 882 // cache cannot be pre-fetched since some classes won't have it yet 883 entry = mh->constants()->cache()->entry_at(cpci); 884 } 885 int i = entry->constant_pool_index(); 886 assert(i < mh->constants()->length(), "sanity check"); 887 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering 888 if (is_invokedynamic) *(p+3) = *(p+4) = 0; 889 break; 890 } 891 case Bytecodes::_ldc_w: 892 is_wide = true; // fall through 893 case Bytecodes::_ldc: { 894 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) { 895 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1)); 896 int i = mh->constants()->object_to_cp_index(cpci); 897 assert(i < mh->constants()->length(), "sanity check"); 898 if (is_wide) { 899 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering 900 } else { 901 *(p+1) = (u1)i; 902 } 903 } 904 break; 905 } 906 } 907 } 908 909 p += len; 910 } 911 }