1 /* 2 * Copyright (c) 2005, 2012, 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 constantPoolOopDesc::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 objArrayHandle fields_anno(thread(), 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 typeArrayHandle anno(thread(), fields_anno.not_null() ? 71 (typeArrayOop)(fields_anno->obj_at(fs.index())) : 72 (typeArrayOop)NULL); 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.not_null()) { 96 ++attr_count; // has RuntimeVisibleAnnotations attribute 97 } 98 99 write_u2(attr_count); 100 101 if (initial_value_index != 0) { 102 write_attribute_name_index("ConstantValue"); 103 write_u4(2); //length always 2 104 write_u2(initial_value_index); 105 } 106 if (access_flags.is_synthetic()) { 107 // write_synthetic_attribute(); 108 } 109 if (generic_signature_index != 0) { 110 write_signature_attribute(generic_signature_index); 111 } 112 if (anno.not_null()) { 113 write_annotations_attribute("RuntimeVisibleAnnotations", anno); 114 } 115 } 116 } 117 118 // Write Code attribute 119 // JVMSpec| Code_attribute { 120 // JVMSpec| u2 attribute_name_index; 121 // JVMSpec| u4 attribute_length; 122 // JVMSpec| u2 max_stack; 123 // JVMSpec| u2 max_locals; 124 // JVMSpec| u4 code_length; 125 // JVMSpec| u1 code[code_length]; 126 // JVMSpec| u2 exception_table_length; 127 // JVMSpec| { u2 start_pc; 128 // JVMSpec| u2 end_pc; 129 // JVMSpec| u2 handler_pc; 130 // JVMSpec| u2 catch_type; 131 // JVMSpec| } exception_table[exception_table_length]; 132 // JVMSpec| u2 attributes_count; 133 // JVMSpec| attribute_info attributes[attributes_count]; 134 // JVMSpec| } 135 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) { 136 constMethodHandle const_method(thread(), method->constMethod()); 137 u2 line_num_cnt = 0; 138 int stackmap_len = 0; 139 int local_variable_table_length = 0; 140 int local_variable_type_table_length = 0; 141 142 // compute number and length of attributes 143 int attr_count = 0; 144 int attr_size = 0; 145 if (const_method->has_linenumber_table()) { 146 line_num_cnt = line_number_table_entries(method); 147 if (line_num_cnt != 0) { 148 ++attr_count; 149 // Compute the complete size of the line number table attribute: 150 // LineNumberTable_attribute { 151 // u2 attribute_name_index; 152 // u4 attribute_length; 153 // u2 line_number_table_length; 154 // { u2 start_pc; 155 // u2 line_number; 156 // } line_number_table[line_number_table_length]; 157 // } 158 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2); 159 } 160 } 161 if (method->has_stackmap_table()) { 162 stackmap_len = method->stackmap_data()->length(); 163 if (stackmap_len != 0) { 164 ++attr_count; 165 // Compute the size of the stack map table attribute (VM stores raw): 166 // StackMapTable_attribute { 167 // u2 attribute_name_index; 168 // u4 attribute_length; 169 // u2 number_of_entries; 170 // stack_map_frame_entries[number_of_entries]; 171 // } 172 attr_size += 2 + 4 + stackmap_len; 173 } 174 } 175 if (method->has_localvariable_table()) { 176 local_variable_table_length = method->localvariable_table_length(); 177 if (local_variable_table_length != 0) { 178 ++attr_count; 179 // Compute the size of the local variable table attribute (VM stores raw): 180 // LocalVariableTable_attribute { 181 // u2 attribute_name_index; 182 // u4 attribute_length; 183 // u2 local_variable_table_length; 184 // { 185 // u2 start_pc; 186 // u2 length; 187 // u2 name_index; 188 // u2 descriptor_index; 189 // u2 index; 190 // } 191 attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2); 192 193 // Local variables with generic signatures must have LVTT entries 194 LocalVariableTableElement *elem = method->localvariable_table_start(); 195 for (int idx = 0; idx < local_variable_table_length; idx++) { 196 if (elem[idx].signature_cp_index > 0) { 197 local_variable_type_table_length++; 198 } 199 } 200 } 201 202 if (local_variable_type_table_length != 0) { 203 ++attr_count; 204 // Compute the size of the local variable type table attribute (VM stores raw): 205 // LocalVariableTypeTable_attribute { 206 // u2 attribute_name_index; 207 // u4 attribute_length; 208 // u2 local_variable_type_table_length; 209 // { 210 // u2 start_pc; 211 // u2 length; 212 // u2 name_index; 213 // u2 signature_index; 214 // u2 index; 215 // } 216 attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2); 217 } 218 } 219 220 ExceptionTable exception_table(method()); 221 int exception_table_length = exception_table.length(); 222 int code_size = const_method->code_size(); 223 int size = 224 2+2+4 + // max_stack, max_locals, code_length 225 code_size + // code 226 2 + // exception_table_length 227 (2+2+2+2) * exception_table_length + // exception_table 228 2 + // attributes_count 229 attr_size; // attributes 230 231 write_attribute_name_index("Code"); 232 write_u4(size); 233 write_u2(method->max_stack()); 234 write_u2(method->max_locals()); 235 write_u4(code_size); 236 copy_bytecodes(method, (unsigned char*)writeable_address(code_size)); 237 write_u2(exception_table_length); 238 for (int index = 0; index < exception_table_length; index++) { 239 write_u2(exception_table.start_pc(index)); 240 write_u2(exception_table.end_pc(index)); 241 write_u2(exception_table.handler_pc(index)); 242 write_u2(exception_table.catch_type_index(index)); 243 } 244 write_u2(attr_count); 245 if (line_num_cnt != 0) { 246 write_line_number_table_attribute(method, line_num_cnt); 247 } 248 if (stackmap_len != 0) { 249 write_stackmap_table_attribute(method, stackmap_len); 250 } 251 if (local_variable_table_length != 0) { 252 write_local_variable_table_attribute(method, local_variable_table_length); 253 } 254 if (local_variable_type_table_length != 0) { 255 write_local_variable_type_table_attribute(method, local_variable_type_table_length); 256 } 257 } 258 259 // Write Exceptions attribute 260 // JVMSpec| Exceptions_attribute { 261 // JVMSpec| u2 attribute_name_index; 262 // JVMSpec| u4 attribute_length; 263 // JVMSpec| u2 number_of_exceptions; 264 // JVMSpec| u2 exception_index_table[number_of_exceptions]; 265 // JVMSpec| } 266 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) { 267 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start(); 268 int checked_exceptions_length = const_method->checked_exceptions_length(); 269 int size = 270 2 + // number_of_exceptions 271 2 * checked_exceptions_length; // exception_index_table 272 273 write_attribute_name_index("Exceptions"); 274 write_u4(size); 275 write_u2(checked_exceptions_length); 276 for (int index = 0; index < checked_exceptions_length; index++) { 277 write_u2(checked_exceptions[index].class_cp_index); 278 } 279 } 280 281 // Write SourceFile attribute 282 // JVMSpec| SourceFile_attribute { 283 // JVMSpec| u2 attribute_name_index; 284 // JVMSpec| u4 attribute_length; 285 // JVMSpec| u2 sourcefile_index; 286 // JVMSpec| } 287 void JvmtiClassFileReconstituter::write_source_file_attribute() { 288 assert(ikh()->source_file_name() != NULL, "caller must check"); 289 290 write_attribute_name_index("SourceFile"); 291 write_u4(2); // always length 2 292 write_u2(symbol_to_cpool_index(ikh()->source_file_name())); 293 } 294 295 // Write SourceDebugExtension attribute 296 // JSR45| SourceDebugExtension_attribute { 297 // JSR45| u2 attribute_name_index; 298 // JSR45| u4 attribute_length; 299 // JSR45| u1 debug_extension[attribute_length]; 300 // JSR45| } 301 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() { 302 assert(ikh()->source_debug_extension() != NULL, "caller must check"); 303 304 write_attribute_name_index("SourceDebugExtension"); 305 int len = (int)strlen(ikh()->source_debug_extension()); 306 write_u4(len); 307 u1* ext = (u1*)ikh()->source_debug_extension(); 308 for (int i=0; i<len; i++) { 309 write_u1(ext[i]); 310 } 311 } 312 313 // Write (generic) Signature attribute 314 // JVMSpec| Signature_attribute { 315 // JVMSpec| u2 attribute_name_index; 316 // JVMSpec| u4 attribute_length; 317 // JVMSpec| u2 signature_index; 318 // JVMSpec| } 319 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) { 320 write_attribute_name_index("Signature"); 321 write_u4(2); // always length 2 322 write_u2(generic_signature_index); 323 } 324 325 // Compute the number of entries in the InnerClasses attribute 326 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() { 327 InnerClassesIterator iter(ikh()); 328 return iter.length(); 329 } 330 331 // Write an annotation attribute. The VM stores them in raw form, so all we need 332 // to do is add the attrubute name and fill in the length. 333 // JSR202| *Annotations_attribute { 334 // JSR202| u2 attribute_name_index; 335 // JSR202| u4 attribute_length; 336 // JSR202| ... 337 // JSR202| } 338 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name, 339 typeArrayHandle annos) { 340 u4 length = annos->length(); 341 write_attribute_name_index(attr_name); 342 write_u4(length); 343 memcpy(writeable_address(length), annos->byte_at_addr(0), length); 344 } 345 346 347 // Write InnerClasses attribute 348 // JVMSpec| InnerClasses_attribute { 349 // JVMSpec| u2 attribute_name_index; 350 // JVMSpec| u4 attribute_length; 351 // JVMSpec| u2 number_of_classes; 352 // JVMSpec| { u2 inner_class_info_index; 353 // JVMSpec| u2 outer_class_info_index; 354 // JVMSpec| u2 inner_name_index; 355 // JVMSpec| u2 inner_class_access_flags; 356 // JVMSpec| } classes[number_of_classes]; 357 // JVMSpec| } 358 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) { 359 InnerClassesIterator iter(ikh()); 360 guarantee(iter.length() != 0 && iter.length() == length, 361 "caller must check"); 362 u2 entry_count = length / instanceKlass::inner_class_next_offset; 363 u4 size = 2 + entry_count * (2+2+2+2); 364 365 write_attribute_name_index("InnerClasses"); 366 write_u4(size); 367 write_u2(entry_count); 368 for (; !iter.done(); iter.next()) { 369 write_u2(iter.inner_class_info_index()); 370 write_u2(iter.outer_class_info_index()); 371 write_u2(iter.inner_name_index()); 372 write_u2(iter.inner_access_flags()); 373 } 374 } 375 376 // Write Synthetic attribute 377 // JVMSpec| Synthetic_attribute { 378 // JVMSpec| u2 attribute_name_index; 379 // JVMSpec| u4 attribute_length; 380 // JVMSpec| } 381 void JvmtiClassFileReconstituter::write_synthetic_attribute() { 382 write_attribute_name_index("Synthetic"); 383 write_u4(0); //length always zero 384 } 385 386 // Compute size of LineNumberTable 387 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) { 388 // The line number table is compressed so we don't know how big it is until decompressed. 389 // Decompression is really fast so we just do it twice. 390 u2 num_entries = 0; 391 CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); 392 while (stream.read_pair()) { 393 num_entries++; 394 } 395 return num_entries; 396 } 397 398 // Write LineNumberTable attribute 399 // JVMSpec| LineNumberTable_attribute { 400 // JVMSpec| u2 attribute_name_index; 401 // JVMSpec| u4 attribute_length; 402 // JVMSpec| u2 line_number_table_length; 403 // JVMSpec| { u2 start_pc; 404 // JVMSpec| u2 line_number; 405 // JVMSpec| } line_number_table[line_number_table_length]; 406 // JVMSpec| } 407 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method, 408 u2 num_entries) { 409 410 write_attribute_name_index("LineNumberTable"); 411 write_u4(2 + num_entries * (2 + 2)); 412 write_u2(num_entries); 413 414 CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); 415 while (stream.read_pair()) { 416 write_u2(stream.bci()); 417 write_u2(stream.line()); 418 } 419 } 420 421 // Write LocalVariableTable attribute 422 // JVMSpec| LocalVariableTable_attribute { 423 // JVMSpec| u2 attribute_name_index; 424 // JVMSpec| u4 attribute_length; 425 // JVMSpec| u2 local_variable_table_length; 426 // JVMSpec| { u2 start_pc; 427 // JVMSpec| u2 length; 428 // JVMSpec| u2 name_index; 429 // JVMSpec| u2 descriptor_index; 430 // JVMSpec| u2 index; 431 // JVMSpec| } local_variable_table[local_variable_table_length]; 432 // JVMSpec| } 433 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) { 434 write_attribute_name_index("LocalVariableTable"); 435 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); 436 write_u2(num_entries); 437 438 assert(method->localvariable_table_length() == num_entries, "just checking"); 439 440 LocalVariableTableElement *elem = method->localvariable_table_start(); 441 for (int j=0; j<method->localvariable_table_length(); j++) { 442 write_u2(elem->start_bci); 443 write_u2(elem->length); 444 write_u2(elem->name_cp_index); 445 write_u2(elem->descriptor_cp_index); 446 write_u2(elem->slot); 447 elem++; 448 } 449 } 450 451 // Write LocalVariableTypeTable attribute 452 // JVMSpec| LocalVariableTypeTable_attribute { 453 // JVMSpec| u2 attribute_name_index; 454 // JVMSpec| u4 attribute_length; 455 // JVMSpec| u2 local_variable_type_table_length; 456 // JVMSpec| { u2 start_pc; 457 // JVMSpec| u2 length; 458 // JVMSpec| u2 name_index; 459 // JVMSpec| u2 signature_index; 460 // JVMSpec| u2 index; 461 // JVMSpec| } local_variable_type_table[local_variable_type_table_length]; 462 // JVMSpec| } 463 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(methodHandle method, u2 num_entries) { 464 write_attribute_name_index("LocalVariableTypeTable"); 465 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); 466 write_u2(num_entries); 467 468 LocalVariableTableElement *elem = method->localvariable_table_start(); 469 for (int j=0; j<method->localvariable_table_length(); j++) { 470 if (elem->signature_cp_index > 0) { 471 // Local variable has a generic signature - write LVTT attribute entry 472 write_u2(elem->start_bci); 473 write_u2(elem->length); 474 write_u2(elem->name_cp_index); 475 write_u2(elem->signature_cp_index); 476 write_u2(elem->slot); 477 num_entries--; 478 } 479 elem++; 480 } 481 assert(num_entries == 0, "just checking"); 482 } 483 484 // Write stack map table attribute 485 // JSR-202| StackMapTable_attribute { 486 // JSR-202| u2 attribute_name_index; 487 // JSR-202| u4 attribute_length; 488 // JSR-202| u2 number_of_entries; 489 // JSR-202| stack_map_frame_entries[number_of_entries]; 490 // JSR-202| } 491 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method, 492 int stackmap_len) { 493 494 write_attribute_name_index("StackMapTable"); 495 write_u4(stackmap_len); 496 memcpy( 497 writeable_address(stackmap_len), 498 (void*)(method->stackmap_data()->byte_at_addr(0)), 499 stackmap_len); 500 } 501 502 // Write one method_info structure 503 // JVMSpec| method_info { 504 // JVMSpec| u2 access_flags; 505 // JVMSpec| u2 name_index; 506 // JVMSpec| u2 descriptor_index; 507 // JVMSpec| u2 attributes_count; 508 // JVMSpec| attribute_info attributes[attributes_count]; 509 // JVMSpec| } 510 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) { 511 AccessFlags access_flags = method->access_flags(); 512 constMethodHandle const_method(thread(), method->constMethod()); 513 u2 generic_signature_index = const_method->generic_signature_index(); 514 typeArrayHandle anno(thread(), method->annotations()); 515 typeArrayHandle param_anno(thread(), method->parameter_annotations()); 516 typeArrayHandle default_anno(thread(), method->annotation_default()); 517 518 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS); 519 write_u2(const_method->name_index()); 520 write_u2(const_method->signature_index()); 521 522 // write attributes in the same order javac does, so we can test with byte for 523 // byte comparison 524 int attr_count = 0; 525 if (const_method->code_size() != 0) { 526 ++attr_count; // has Code attribute 527 } 528 if (const_method->has_checked_exceptions()) { 529 ++attr_count; // has Exceptions attribute 530 } 531 if (default_anno.not_null()) { 532 ++attr_count; // has AnnotationDefault attribute 533 } 534 // Deprecated attribute would go here 535 if (access_flags.is_synthetic()) { // FIXME 536 // ++attr_count; 537 } 538 if (generic_signature_index != 0) { 539 ++attr_count; 540 } 541 if (anno.not_null()) { 542 ++attr_count; // has RuntimeVisibleAnnotations attribute 543 } 544 if (param_anno.not_null()) { 545 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute 546 } 547 548 write_u2(attr_count); 549 if (const_method->code_size() > 0) { 550 write_code_attribute(method); 551 } 552 if (const_method->has_checked_exceptions()) { 553 write_exceptions_attribute(const_method); 554 } 555 if (default_anno.not_null()) { 556 write_annotations_attribute("AnnotationDefault", default_anno); 557 } 558 // Deprecated attribute would go here 559 if (access_flags.is_synthetic()) { 560 // write_synthetic_attribute(); 561 } 562 if (generic_signature_index != 0) { 563 write_signature_attribute(generic_signature_index); 564 } 565 if (anno.not_null()) { 566 write_annotations_attribute("RuntimeVisibleAnnotations", anno); 567 } 568 if (param_anno.not_null()) { 569 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno); 570 } 571 } 572 573 // Write the class attributes portion of ClassFile structure 574 // JVMSpec| u2 attributes_count; 575 // JVMSpec| attribute_info attributes[attributes_count]; 576 void JvmtiClassFileReconstituter::write_class_attributes() { 577 u2 inner_classes_length = inner_classes_attribute_length(); 578 Symbol* generic_signature = ikh()->generic_signature(); 579 typeArrayHandle anno(thread(), ikh()->class_annotations()); 580 581 int attr_count = 0; 582 if (generic_signature != NULL) { 583 ++attr_count; 584 } 585 if (ikh()->source_file_name() != NULL) { 586 ++attr_count; 587 } 588 if (ikh()->source_debug_extension() != NULL) { 589 ++attr_count; 590 } 591 if (inner_classes_length > 0) { 592 ++attr_count; 593 } 594 if (anno.not_null()) { 595 ++attr_count; // has RuntimeVisibleAnnotations attribute 596 } 597 598 write_u2(attr_count); 599 600 if (generic_signature != NULL) { 601 write_signature_attribute(symbol_to_cpool_index(generic_signature)); 602 } 603 if (ikh()->source_file_name() != NULL) { 604 write_source_file_attribute(); 605 } 606 if (ikh()->source_debug_extension() != NULL) { 607 write_source_debug_extension_attribute(); 608 } 609 if (inner_classes_length > 0) { 610 write_inner_classes_attribute(inner_classes_length); 611 } 612 if (anno.not_null()) { 613 write_annotations_attribute("RuntimeVisibleAnnotations", anno); 614 } 615 } 616 617 // Write the method information portion of ClassFile structure 618 // JVMSpec| u2 methods_count; 619 // JVMSpec| method_info methods[methods_count]; 620 void JvmtiClassFileReconstituter::write_method_infos() { 621 HandleMark hm(thread()); 622 objArrayHandle methods(thread(), ikh()->methods()); 623 int num_methods = methods->length(); 624 625 write_u2(num_methods); 626 if (JvmtiExport::can_maintain_original_method_order()) { 627 int index; 628 int original_index; 629 int* method_order = NEW_RESOURCE_ARRAY(int, num_methods); 630 631 // invert the method order mapping 632 for (index = 0; index < num_methods; index++) { 633 original_index = ikh()->method_ordering()->int_at(index); 634 assert(original_index >= 0 && original_index < num_methods, 635 "invalid original method index"); 636 method_order[original_index] = index; 637 } 638 639 // write in original order 640 for (original_index = 0; original_index < num_methods; original_index++) { 641 index = method_order[original_index]; 642 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index))); 643 write_method_info(method); 644 } 645 } else { 646 // method order not preserved just dump the method infos 647 for (int index = 0; index < num_methods; index++) { 648 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index))); 649 write_method_info(method); 650 } 651 } 652 } 653 654 void JvmtiClassFileReconstituter::write_class_file_format() { 655 ReallocMark(); 656 657 // JVMSpec| ClassFile { 658 // JVMSpec| u4 magic; 659 write_u4(0xCAFEBABE); 660 661 // JVMSpec| u2 minor_version; 662 // JVMSpec| u2 major_version; 663 write_u2(ikh()->minor_version()); 664 u2 major = ikh()->major_version(); 665 write_u2(major); 666 667 // JVMSpec| u2 constant_pool_count; 668 // JVMSpec| cp_info constant_pool[constant_pool_count-1]; 669 write_u2(cpool()->length()); 670 copy_cpool_bytes(writeable_address(cpool_size())); 671 672 // JVMSpec| u2 access_flags; 673 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS); 674 675 // JVMSpec| u2 this_class; 676 // JVMSpec| u2 super_class; 677 write_u2(class_symbol_to_cpool_index(ikh()->name())); 678 klassOop super_class = ikh()->super(); 679 write_u2(super_class == NULL? 0 : // zero for java.lang.Object 680 class_symbol_to_cpool_index(super_class->klass_part()->name())); 681 682 // JVMSpec| u2 interfaces_count; 683 // JVMSpec| u2 interfaces[interfaces_count]; 684 objArrayHandle interfaces(thread(), ikh()->local_interfaces()); 685 int num_interfaces = interfaces->length(); 686 write_u2(num_interfaces); 687 for (int index = 0; index < num_interfaces; index++) { 688 HandleMark hm(thread()); 689 instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index))); 690 write_u2(class_symbol_to_cpool_index(iikh->name())); 691 } 692 693 // JVMSpec| u2 fields_count; 694 // JVMSpec| field_info fields[fields_count]; 695 write_field_infos(); 696 697 // JVMSpec| u2 methods_count; 698 // JVMSpec| method_info methods[methods_count]; 699 write_method_infos(); 700 701 // JVMSpec| u2 attributes_count; 702 // JVMSpec| attribute_info attributes[attributes_count]; 703 // JVMSpec| } /* end ClassFile 8? 704 write_class_attributes(); 705 } 706 707 address JvmtiClassFileReconstituter::writeable_address(size_t size) { 708 size_t used_size = _buffer_ptr - _buffer; 709 if (size + used_size >= _buffer_size) { 710 // compute the new buffer size: must be at least twice as big as before 711 // plus whatever new is being used; then convert to nice clean block boundary 712 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size 713 * initial_buffer_size; 714 715 // VM goes belly-up if the memory isn't available, so cannot do OOM processing 716 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size); 717 _buffer_size = new_buffer_size; 718 _buffer_ptr = _buffer + used_size; 719 } 720 u1* ret_ptr = _buffer_ptr; 721 _buffer_ptr += size; 722 return ret_ptr; 723 } 724 725 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) { 726 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name)); 727 assert(sym != NULL, "attribute name symbol not found"); 728 u2 attr_name_index = symbol_to_cpool_index(sym); 729 assert(attr_name_index != 0, "attribute name symbol not in constant pool"); 730 write_u2(attr_name_index); 731 } 732 733 void JvmtiClassFileReconstituter::write_u1(u1 x) { 734 *writeable_address(1) = x; 735 } 736 737 void JvmtiClassFileReconstituter::write_u2(u2 x) { 738 Bytes::put_Java_u2(writeable_address(2), x); 739 } 740 741 void JvmtiClassFileReconstituter::write_u4(u4 x) { 742 Bytes::put_Java_u4(writeable_address(4), x); 743 } 744 745 void JvmtiClassFileReconstituter::write_u8(u8 x) { 746 Bytes::put_Java_u8(writeable_address(8), x); 747 } 748 749 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh, 750 unsigned char* bytecodes) { 751 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes 752 // and the breakpoint bytecode are converted to their original bytecodes. 753 754 BytecodeStream bs(mh); 755 756 unsigned char* p = bytecodes; 757 Bytecodes::Code code; 758 bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten(); 759 760 while ((code = bs.next()) >= 0) { 761 assert(Bytecodes::is_java_code(code), "sanity check"); 762 assert(code != Bytecodes::_breakpoint, "sanity check"); 763 764 // length of bytecode (mnemonic + operands) 765 address bcp = bs.bcp(); 766 int len = bs.instruction_size(); 767 assert(len > 0, "length must be > 0"); 768 769 // copy the bytecodes 770 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code); 771 if (len > 1) { 772 memcpy(p+1, bcp+1, len-1); 773 } 774 775 // During linking the get/put and invoke instructions are rewritten 776 // with an index into the constant pool cache. The original constant 777 // pool index must be returned to caller. Rewrite the index. 778 if (is_rewritten && len >= 3) { 779 switch (code) { 780 case Bytecodes::_getstatic : // fall through 781 case Bytecodes::_putstatic : // fall through 782 case Bytecodes::_getfield : // fall through 783 case Bytecodes::_putfield : // fall through 784 case Bytecodes::_invokevirtual : // fall through 785 case Bytecodes::_invokespecial : // fall through 786 case Bytecodes::_invokestatic : // fall through 787 case Bytecodes::_invokedynamic : // fall through 788 case Bytecodes::_invokeinterface : 789 assert(len == 3 || 790 (code == Bytecodes::_invokeinterface && len == 5) || 791 (code == Bytecodes::_invokedynamic && len == 5), 792 "sanity check"); 793 794 int cpci = Bytes::get_native_u2(bcp+1); 795 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic); 796 if (is_invokedynamic) 797 cpci = Bytes::get_native_u4(bcp+1); 798 // cache cannot be pre-fetched since some classes won't have it yet 799 ConstantPoolCacheEntry* entry = 800 mh->constants()->cache()->main_entry_at(cpci); 801 int i = entry->constant_pool_index(); 802 assert(i < mh->constants()->length(), "sanity check"); 803 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering 804 if (is_invokedynamic) *(p+3) = *(p+4) = 0; 805 break; 806 } 807 } 808 809 p += len; 810 } 811 }