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