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