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