1 /*
2 * Copyright (c) 2005, 2022, 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 "classfile/vmClasses.hpp"
28 #include "interpreter/bytecodeStream.hpp"
29 #include "memory/universe.hpp"
30 #include "oops/fieldStreams.inline.hpp"
31 #include "oops/recordComponent.hpp"
32 #include "prims/jvmtiClassFileReconstituter.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/signature.hpp"
35 #include "utilities/bytes.hpp"
36
37 // FIXME: add Deprecated attribute
38 // FIXME: fix Synthetic attribute
39 // FIXME: per Serguei, add error return handling for ConstantPool::copy_cpool_bytes()
40
41 JvmtiConstantPoolReconstituter::JvmtiConstantPoolReconstituter(InstanceKlass* ik) {
42 set_error(JVMTI_ERROR_NONE);
43 _ik = ik;
44 _cpool = constantPoolHandle(Thread::current(), ik->constants());
45 _symmap = new SymbolHashMap();
46 _classmap = new SymbolHashMap();
47 _cpool_size = _cpool->hash_entries_to(_symmap, _classmap);
48 if (_cpool_size == 0) {
49 set_error(JVMTI_ERROR_OUT_OF_MEMORY);
50 } else if (_cpool_size < 0) {
51 set_error(JVMTI_ERROR_INTERNAL);
52 }
53 }
54
55 // Write the field information portion of ClassFile structure
56 // JVMSpec| u2 fields_count;
57 // JVMSpec| field_info fields[fields_count];
58 void JvmtiClassFileReconstituter::write_field_infos() {
59 HandleMark hm(thread());
60 Array<AnnotationArray*>* fields_anno = ik()->fields_annotations();
61 Array<AnnotationArray*>* fields_type_anno = ik()->fields_type_annotations();
62
63 // Compute the real number of Java fields
64 int java_fields = ik()->java_fields_count();
65
66 write_u2(java_fields);
67 for (JavaFieldStream fs(ik()); !fs.done(); fs.next()) {
68 AccessFlags access_flags = fs.access_flags();
69 int name_index = fs.name_index();
70 int signature_index = fs.signature_index();
71 int initial_value_index = fs.initval_index();
72 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
73 // int offset = ik()->field_offset( index );
74 int generic_signature_index = fs.generic_signature_index();
75 AnnotationArray* anno = fields_anno == NULL ? NULL : fields_anno->at(fs.index());
76 AnnotationArray* type_anno = fields_type_anno == NULL ? NULL : fields_type_anno->at(fs.index());
77
78 // JVMSpec| field_info {
79 // JVMSpec| u2 access_flags;
80 // JVMSpec| u2 name_index;
81 // JVMSpec| u2 descriptor_index;
82 // JVMSpec| u2 attributes_count;
83 // JVMSpec| attribute_info attributes[attributes_count];
84 // JVMSpec| }
85
86 write_u2(access_flags.as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
87 write_u2(name_index);
88 write_u2(signature_index);
89 int attr_count = 0;
90 if (initial_value_index != 0) {
91 ++attr_count;
92 }
93 if (access_flags.is_synthetic()) {
94 // ++attr_count;
95 }
96 if (generic_signature_index != 0) {
97 ++attr_count;
98 }
99 if (anno != NULL) {
100 ++attr_count; // has RuntimeVisibleAnnotations attribute
101 }
102 if (type_anno != NULL) {
103 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
104 }
105
106 write_u2(attr_count);
107
108 if (initial_value_index != 0) {
109 write_attribute_name_index("ConstantValue");
110 write_u4(2); //length always 2
111 write_u2(initial_value_index);
112 }
113 if (access_flags.is_synthetic()) {
114 // write_synthetic_attribute();
115 }
116 if (generic_signature_index != 0) {
117 write_signature_attribute(generic_signature_index);
118 }
119 if (anno != NULL) {
120 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
121 }
122 if (type_anno != NULL) {
123 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
124 }
125 }
126 }
127
128 // Write Code attribute
129 // JVMSpec| Code_attribute {
130 // JVMSpec| u2 attribute_name_index;
131 // JVMSpec| u4 attribute_length;
132 // JVMSpec| u2 max_stack;
133 // JVMSpec| u2 max_locals;
134 // JVMSpec| u4 code_length;
135 // JVMSpec| u1 code[code_length];
136 // JVMSpec| u2 exception_table_length;
137 // JVMSpec| { u2 start_pc;
138 // JVMSpec| u2 end_pc;
139 // JVMSpec| u2 handler_pc;
140 // JVMSpec| u2 catch_type;
141 // JVMSpec| } exception_table[exception_table_length];
142 // JVMSpec| u2 attributes_count;
143 // JVMSpec| attribute_info attributes[attributes_count];
144 // JVMSpec| }
145 void JvmtiClassFileReconstituter::write_code_attribute(const methodHandle& method) {
146 ConstMethod* const_method = method->constMethod();
147 u2 line_num_cnt = 0;
148 int stackmap_len = 0;
149 int local_variable_table_length = 0;
150 int local_variable_type_table_length = 0;
151
152 // compute number and length of attributes
153 int attr_count = 0;
154 int attr_size = 0;
155 if (const_method->has_linenumber_table()) {
156 line_num_cnt = line_number_table_entries(method);
157 if (line_num_cnt != 0) {
158 ++attr_count;
159 // Compute the complete size of the line number table attribute:
160 // LineNumberTable_attribute {
161 // u2 attribute_name_index;
162 // u4 attribute_length;
163 // u2 line_number_table_length;
164 // { u2 start_pc;
165 // u2 line_number;
166 // } line_number_table[line_number_table_length];
167 // }
168 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
169 }
170 }
171 if (method->has_stackmap_table()) {
172 stackmap_len = method->stackmap_data()->length();
173 if (stackmap_len != 0) {
174 ++attr_count;
175 // Compute the size of the stack map table attribute (VM stores raw):
176 // StackMapTable_attribute {
177 // u2 attribute_name_index;
178 // u4 attribute_length;
179 // u2 number_of_entries;
180 // stack_map_frame_entries[number_of_entries];
181 // }
182 attr_size += 2 + 4 + stackmap_len;
183 }
184 }
185 if (method->has_localvariable_table()) {
186 local_variable_table_length = method->localvariable_table_length();
187 if (local_variable_table_length != 0) {
188 ++attr_count;
189 // Compute the size of the local variable table attribute (VM stores raw):
190 // LocalVariableTable_attribute {
191 // u2 attribute_name_index;
192 // u4 attribute_length;
193 // u2 local_variable_table_length;
194 // {
195 // u2 start_pc;
196 // u2 length;
197 // u2 name_index;
198 // u2 descriptor_index;
199 // u2 index;
200 // }
201 attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2);
202
203 // Local variables with generic signatures must have LVTT entries
204 LocalVariableTableElement *elem = method->localvariable_table_start();
205 for (int idx = 0; idx < local_variable_table_length; idx++) {
206 if (elem[idx].signature_cp_index != 0) {
207 local_variable_type_table_length++;
208 }
209 }
210
211 if (local_variable_type_table_length != 0) {
212 ++attr_count;
213 // Compute the size of the local variable type table attribute (VM stores raw):
214 // LocalVariableTypeTable_attribute {
215 // u2 attribute_name_index;
216 // u4 attribute_length;
217 // u2 local_variable_type_table_length;
218 // {
219 // u2 start_pc;
220 // u2 length;
221 // u2 name_index;
222 // u2 signature_index;
223 // u2 index;
224 // }
225 attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2);
226 }
227 }
228 }
229
230 ExceptionTable exception_table(method());
231 int exception_table_length = exception_table.length();
232 int code_size = const_method->code_size();
233 int size =
234 2+2+4 + // max_stack, max_locals, code_length
235 code_size + // code
236 2 + // exception_table_length
237 (2+2+2+2) * exception_table_length + // exception_table
238 2 + // attributes_count
239 attr_size; // attributes
240
241 write_attribute_name_index("Code");
242 write_u4(size);
243 write_u2(method->verifier_max_stack());
244 write_u2(method->max_locals());
245 write_u4(code_size);
246 copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
247 write_u2(exception_table_length);
248 for (int index = 0; index < exception_table_length; index++) {
249 write_u2(exception_table.start_pc(index));
250 write_u2(exception_table.end_pc(index));
251 write_u2(exception_table.handler_pc(index));
252 write_u2(exception_table.catch_type_index(index));
253 }
254 write_u2(attr_count);
255 if (line_num_cnt != 0) {
256 write_line_number_table_attribute(method, line_num_cnt);
257 }
258 if (stackmap_len != 0) {
259 write_stackmap_table_attribute(method, stackmap_len);
260 }
261 if (local_variable_table_length != 0) {
262 write_local_variable_table_attribute(method, local_variable_table_length);
263 }
264 if (local_variable_type_table_length != 0) {
265 write_local_variable_type_table_attribute(method, local_variable_type_table_length);
266 }
267 }
268
269 // Write Exceptions attribute
270 // JVMSpec| Exceptions_attribute {
271 // JVMSpec| u2 attribute_name_index;
272 // JVMSpec| u4 attribute_length;
273 // JVMSpec| u2 number_of_exceptions;
274 // JVMSpec| u2 exception_index_table[number_of_exceptions];
275 // JVMSpec| }
276 void JvmtiClassFileReconstituter::write_exceptions_attribute(ConstMethod* const_method) {
277 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
278 int checked_exceptions_length = const_method->checked_exceptions_length();
279 int size =
280 2 + // number_of_exceptions
281 2 * checked_exceptions_length; // exception_index_table
282
283 write_attribute_name_index("Exceptions");
284 write_u4(size);
285 write_u2(checked_exceptions_length);
286 for (int index = 0; index < checked_exceptions_length; index++) {
287 write_u2(checked_exceptions[index].class_cp_index);
288 }
289 }
290
291 // Write MethodParameters attribute
292 // JVMSpec| MethodParameters_attribute {
293 // JVMSpec| u2 attribute_name_index;
294 // JVMSpec| u4 attribute_length;
295 // JVMSpec| u1 parameters_count;
296 // JVMSpec| { u2 name_index;
297 // JVMSpec| u2 access_flags;
298 // JVMSpec| } parameters[parameters_count];
299 // JVMSpec| }
300 void JvmtiClassFileReconstituter::write_method_parameter_attribute(const ConstMethod* const_method) {
301 const MethodParametersElement *parameters = const_method->method_parameters_start();
302 int length = const_method->method_parameters_length();
303 assert(length <= max_jubyte, "must fit u1");
304 int size = 1 // parameters_count
305 + (2 + 2) * length; // parameters
306
307 write_attribute_name_index("MethodParameters");
308 write_u4(size);
309 write_u1(length);
310 for (int index = 0; index < length; index++) {
311 write_u2(parameters[index].name_cp_index);
312 write_u2(parameters[index].flags);
313 }
314 }
315
316 // Write SourceFile attribute
317 // JVMSpec| SourceFile_attribute {
318 // JVMSpec| u2 attribute_name_index;
319 // JVMSpec| u4 attribute_length;
320 // JVMSpec| u2 sourcefile_index;
321 // JVMSpec| }
322 void JvmtiClassFileReconstituter::write_source_file_attribute() {
323 assert(ik()->source_file_name() != NULL, "caller must check");
324
325 write_attribute_name_index("SourceFile");
326 write_u4(2); // always length 2
327 write_u2(symbol_to_cpool_index(ik()->source_file_name()));
328 }
329
330 // Write SourceDebugExtension attribute
331 // JSR45| SourceDebugExtension_attribute {
332 // JSR45| u2 attribute_name_index;
333 // JSR45| u4 attribute_length;
334 // JSR45| u1 debug_extension[attribute_length];
335 // JSR45| }
336 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
337 assert(ik()->source_debug_extension() != NULL, "caller must check");
338
339 write_attribute_name_index("SourceDebugExtension");
340 int len = (int)strlen(ik()->source_debug_extension());
341 write_u4(len);
342 u1* ext = (u1*)ik()->source_debug_extension();
343 for (int i=0; i<len; i++) {
344 write_u1(ext[i]);
345 }
346 }
347
348 // Write (generic) Signature attribute
349 // JVMSpec| Signature_attribute {
350 // JVMSpec| u2 attribute_name_index;
351 // JVMSpec| u4 attribute_length;
352 // JVMSpec| u2 signature_index;
353 // JVMSpec| }
354 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
355 write_attribute_name_index("Signature");
356 write_u4(2); // always length 2
357 write_u2(generic_signature_index);
358 }
359
360 // Compute the number of entries in the InnerClasses attribute
361 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
362 InnerClassesIterator iter(ik());
363 return iter.length();
364 }
365
366 // Write an annotation attribute. The VM stores them in raw form, so all we need
367 // to do is add the attrubute name and fill in the length.
368 // JSR202| *Annotations_attribute {
369 // JSR202| u2 attribute_name_index;
370 // JSR202| u4 attribute_length;
371 // JSR202| ...
372 // JSR202| }
373 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
374 AnnotationArray* annos) {
375 u4 length = annos->length();
376 write_attribute_name_index(attr_name);
377 write_u4(length);
378 memcpy(writeable_address(length), annos->adr_at(0), length);
379 }
380
381 // BootstrapMethods_attribute {
382 // u2 attribute_name_index;
383 // u4 attribute_length;
384 // u2 num_bootstrap_methods;
385 // { u2 bootstrap_method_ref;
386 // u2 num_bootstrap_arguments;
387 // u2 bootstrap_arguments[num_bootstrap_arguments];
388 // } bootstrap_methods[num_bootstrap_methods];
389 // }
390 void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {
391 Array<u2>* operands = cpool()->operands();
392 write_attribute_name_index("BootstrapMethods");
393 int num_bootstrap_methods = ConstantPool::operand_array_length(operands);
394
395 // calculate length of attribute
396 int length = sizeof(u2); // num_bootstrap_methods
397 for (int n = 0; n < num_bootstrap_methods; n++) {
398 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
399 length += sizeof(u2); // bootstrap_method_ref
400 length += sizeof(u2); // num_bootstrap_arguments
401 length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments]
402 }
403 write_u4(length);
404
405 // write attribute
406 write_u2(num_bootstrap_methods);
407 for (int n = 0; n < num_bootstrap_methods; n++) {
408 u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n);
409 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
410 write_u2(bootstrap_method_ref);
411 write_u2(num_bootstrap_arguments);
412 for (int arg = 0; arg < num_bootstrap_arguments; arg++) {
413 u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg);
414 write_u2(bootstrap_argument);
415 }
416 }
417 }
418
419 // NestHost_attribute {
420 // u2 attribute_name_index;
421 // u4 attribute_length;
422 // u2 host_class_index;
423 // }
424 void JvmtiClassFileReconstituter::write_nest_host_attribute() {
425 int length = sizeof(u2);
426 int host_class_index = ik()->nest_host_index();
427
428 write_attribute_name_index("NestHost");
429 write_u4(length);
430 write_u2(host_class_index);
431 }
432
433 // NestMembers_attribute {
434 // u2 attribute_name_index;
435 // u4 attribute_length;
436 // u2 number_of_classes;
437 // u2 classes[number_of_classes];
438 // }
439 void JvmtiClassFileReconstituter::write_nest_members_attribute() {
440 Array<u2>* nest_members = ik()->nest_members();
441 int number_of_classes = nest_members->length();
442 int length = sizeof(u2) * (1 + number_of_classes);
443
444 write_attribute_name_index("NestMembers");
445 write_u4(length);
446 write_u2(number_of_classes);
447 for (int i = 0; i < number_of_classes; i++) {
448 u2 class_cp_index = nest_members->at(i);
449 write_u2(class_cp_index);
450 }
451 }
452
453 // PermittedSubclasses {
454 // u2 attribute_name_index;
455 // u4 attribute_length;
456 // u2 number_of_classes;
457 // u2 classes[number_of_classes];
458 // }
459 void JvmtiClassFileReconstituter::write_permitted_subclasses_attribute() {
460 Array<u2>* permitted_subclasses = ik()->permitted_subclasses();
461 int number_of_classes = permitted_subclasses->length();
462 int length = sizeof(u2) * (1 + number_of_classes); // '1 +' is for number_of_classes field
463
464 write_attribute_name_index("PermittedSubclasses");
465 write_u4(length);
466 write_u2(number_of_classes);
467 for (int i = 0; i < number_of_classes; i++) {
468 u2 class_cp_index = permitted_subclasses->at(i);
469 write_u2(class_cp_index);
470 }
471 }
472
473 // Record {
474 // u2 attribute_name_index;
475 // u4 attribute_length;
476 // u2 components_count;
477 // component_info components[components_count];
478 // }
479 // component_info {
480 // u2 name_index;
481 // u2 descriptor_index
482 // u2 attributes_count;
483 // attribute_info_attributes[attributes_count];
484 // }
485 void JvmtiClassFileReconstituter::write_record_attribute() {
486 Array<RecordComponent*>* components = ik()->record_components();
487 int number_of_components = components->length();
488
489 // Each component has a u2 for name, descr, attribute count
490 int length = sizeof(u2) + (sizeof(u2) * 3 * number_of_components);
491 for (int x = 0; x < number_of_components; x++) {
492 RecordComponent* component = components->at(x);
493 if (component->generic_signature_index() != 0) {
494 length += 8; // Signature attribute size
495 assert(component->attributes_count() > 0, "Bad component attributes count");
496 }
497 if (component->annotations() != NULL) {
498 length += 6 + component->annotations()->length();
499 }
500 if (component->type_annotations() != NULL) {
501 length += 6 + component->type_annotations()->length();
502 }
503 }
504
505 write_attribute_name_index("Record");
506 write_u4(length);
507 write_u2(number_of_components);
508 for (int i = 0; i < number_of_components; i++) {
509 RecordComponent* component = components->at(i);
510 write_u2(component->name_index());
511 write_u2(component->descriptor_index());
512 write_u2(component->attributes_count());
513 if (component->generic_signature_index() != 0) {
514 write_signature_attribute(component->generic_signature_index());
515 }
516 if (component->annotations() != NULL) {
517 write_annotations_attribute("RuntimeVisibleAnnotations", component->annotations());
518 }
519 if (component->type_annotations() != NULL) {
520 write_annotations_attribute("RuntimeVisibleTypeAnnotations", component->type_annotations());
521 }
522 }
523 }
524
525 // Write InnerClasses attribute
526 // JVMSpec| InnerClasses_attribute {
527 // JVMSpec| u2 attribute_name_index;
528 // JVMSpec| u4 attribute_length;
529 // JVMSpec| u2 number_of_classes;
530 // JVMSpec| { u2 inner_class_info_index;
531 // JVMSpec| u2 outer_class_info_index;
532 // JVMSpec| u2 inner_name_index;
533 // JVMSpec| u2 inner_class_access_flags;
534 // JVMSpec| } classes[number_of_classes];
535 // JVMSpec| }
536 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
537 InnerClassesIterator iter(ik());
538 guarantee(iter.length() != 0 && iter.length() == length,
539 "caller must check");
540 u2 entry_count = length / InstanceKlass::inner_class_next_offset;
541 u4 size = 2 + entry_count * (2+2+2+2);
542
543 write_attribute_name_index("InnerClasses");
544 write_u4(size);
545 write_u2(entry_count);
546 for (; !iter.done(); iter.next()) {
547 write_u2(iter.inner_class_info_index());
548 write_u2(iter.outer_class_info_index());
549 write_u2(iter.inner_name_index());
550 write_u2(iter.inner_access_flags());
551 }
552 }
553
554 // Write Synthetic attribute
555 // JVMSpec| Synthetic_attribute {
556 // JVMSpec| u2 attribute_name_index;
557 // JVMSpec| u4 attribute_length;
558 // JVMSpec| }
559 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
560 write_attribute_name_index("Synthetic");
561 write_u4(0); //length always zero
562 }
563
564 // Compute size of LineNumberTable
565 u2 JvmtiClassFileReconstituter::line_number_table_entries(const methodHandle& method) {
566 // The line number table is compressed so we don't know how big it is until decompressed.
567 // Decompression is really fast so we just do it twice.
568 u2 num_entries = 0;
569 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
570 while (stream.read_pair()) {
571 num_entries++;
572 }
573 return num_entries;
574 }
575
576 // Write LineNumberTable attribute
577 // JVMSpec| LineNumberTable_attribute {
578 // JVMSpec| u2 attribute_name_index;
579 // JVMSpec| u4 attribute_length;
580 // JVMSpec| u2 line_number_table_length;
581 // JVMSpec| { u2 start_pc;
582 // JVMSpec| u2 line_number;
583 // JVMSpec| } line_number_table[line_number_table_length];
584 // JVMSpec| }
585 void JvmtiClassFileReconstituter::write_line_number_table_attribute(const methodHandle& method,
586 u2 num_entries) {
587
588 write_attribute_name_index("LineNumberTable");
589 write_u4(2 + num_entries * (2 + 2));
590 write_u2(num_entries);
591
592 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
593 while (stream.read_pair()) {
594 write_u2(stream.bci());
595 write_u2(stream.line());
596 }
597 }
598
599 // Write LocalVariableTable attribute
600 // JVMSpec| LocalVariableTable_attribute {
601 // JVMSpec| u2 attribute_name_index;
602 // JVMSpec| u4 attribute_length;
603 // JVMSpec| u2 local_variable_table_length;
604 // JVMSpec| { u2 start_pc;
605 // JVMSpec| u2 length;
606 // JVMSpec| u2 name_index;
607 // JVMSpec| u2 descriptor_index;
608 // JVMSpec| u2 index;
609 // JVMSpec| } local_variable_table[local_variable_table_length];
610 // JVMSpec| }
611 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(const methodHandle& method, u2 num_entries) {
612 write_attribute_name_index("LocalVariableTable");
613 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
614 write_u2(num_entries);
615
616 assert(method->localvariable_table_length() == num_entries, "just checking");
617
618 LocalVariableTableElement *elem = method->localvariable_table_start();
619 for (int j=0; j<method->localvariable_table_length(); j++) {
620 write_u2(elem->start_bci);
621 write_u2(elem->length);
622 write_u2(elem->name_cp_index);
623 write_u2(elem->descriptor_cp_index);
624 write_u2(elem->slot);
625 elem++;
626 }
627 }
628
629 // Write LocalVariableTypeTable attribute
630 // JVMSpec| LocalVariableTypeTable_attribute {
631 // JVMSpec| u2 attribute_name_index;
632 // JVMSpec| u4 attribute_length;
633 // JVMSpec| u2 local_variable_type_table_length;
634 // JVMSpec| { u2 start_pc;
635 // JVMSpec| u2 length;
636 // JVMSpec| u2 name_index;
637 // JVMSpec| u2 signature_index;
638 // JVMSpec| u2 index;
639 // JVMSpec| } local_variable_type_table[local_variable_type_table_length];
640 // JVMSpec| }
641 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries) {
642 write_attribute_name_index("LocalVariableTypeTable");
643 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
644 write_u2(num_entries);
645
646 LocalVariableTableElement *elem = method->localvariable_table_start();
647 for (int j=0; j<method->localvariable_table_length(); j++) {
648 if (elem->signature_cp_index > 0) {
649 // Local variable has a generic signature - write LVTT attribute entry
650 write_u2(elem->start_bci);
651 write_u2(elem->length);
652 write_u2(elem->name_cp_index);
653 write_u2(elem->signature_cp_index);
654 write_u2(elem->slot);
655 num_entries--;
656 }
657 elem++;
658 }
659 assert(num_entries == 0, "just checking");
660 }
661
662 // Write stack map table attribute
663 // JSR-202| StackMapTable_attribute {
664 // JSR-202| u2 attribute_name_index;
665 // JSR-202| u4 attribute_length;
666 // JSR-202| u2 number_of_entries;
667 // JSR-202| stack_map_frame_entries[number_of_entries];
668 // JSR-202| }
669 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(const methodHandle& method,
670 int stackmap_len) {
671
672 write_attribute_name_index("StackMapTable");
673 write_u4(stackmap_len);
674 memcpy(
675 writeable_address(stackmap_len),
676 (void*)(method->stackmap_data()->adr_at(0)),
677 stackmap_len);
678 }
679
680 // Write one method_info structure
681 // JVMSpec| method_info {
682 // JVMSpec| u2 access_flags;
683 // JVMSpec| u2 name_index;
684 // JVMSpec| u2 descriptor_index;
685 // JVMSpec| u2 attributes_count;
686 // JVMSpec| attribute_info attributes[attributes_count];
687 // JVMSpec| }
688 void JvmtiClassFileReconstituter::write_method_info(const methodHandle& method) {
689 AccessFlags access_flags = method->access_flags();
690 ConstMethod* const_method = method->constMethod();
691 u2 generic_signature_index = const_method->generic_signature_index();
692 AnnotationArray* anno = method->annotations();
693 AnnotationArray* param_anno = method->parameter_annotations();
694 AnnotationArray* default_anno = method->annotation_default();
695 AnnotationArray* type_anno = method->type_annotations();
696
697 // skip generated default interface methods
698 if (method->is_overpass()) {
699 return;
700 }
701
702 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
703 write_u2(const_method->name_index());
704 write_u2(const_method->signature_index());
705
706 // write attributes in the same order javac does, so we can test with byte for
707 // byte comparison
708 int attr_count = 0;
709 if (const_method->code_size() != 0) {
710 ++attr_count; // has Code attribute
711 }
712 if (const_method->has_checked_exceptions()) {
713 ++attr_count; // has Exceptions attribute
714 }
715 if (default_anno != NULL) {
716 ++attr_count; // has AnnotationDefault attribute
717 }
718 if (const_method->has_method_parameters()) {
719 ++attr_count; // has MethodParameters attribute
720 }
721 // Deprecated attribute would go here
722 if (access_flags.is_synthetic()) { // FIXME
723 // ++attr_count;
724 }
725 if (generic_signature_index != 0) {
726 ++attr_count;
727 }
728 if (anno != NULL) {
729 ++attr_count; // has RuntimeVisibleAnnotations attribute
730 }
731 if (param_anno != NULL) {
732 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
733 }
734 if (type_anno != NULL) {
735 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
736 }
737
738 write_u2(attr_count);
739 if (const_method->code_size() > 0) {
740 write_code_attribute(method);
741 }
742 if (const_method->has_checked_exceptions()) {
743 write_exceptions_attribute(const_method);
744 }
745 if (default_anno != NULL) {
746 write_annotations_attribute("AnnotationDefault", default_anno);
747 }
748 if (const_method->has_method_parameters()) {
749 write_method_parameter_attribute(const_method);
750 }
751 // Deprecated attribute would go here
752 if (access_flags.is_synthetic()) {
753 // write_synthetic_attribute();
754 }
755 if (generic_signature_index != 0) {
756 write_signature_attribute(generic_signature_index);
757 }
758 if (anno != NULL) {
759 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
760 }
761 if (param_anno != NULL) {
762 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
763 }
764 if (type_anno != NULL) {
765 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
766 }
767 }
768
769 // Write the class attributes portion of ClassFile structure
770 // JVMSpec| u2 attributes_count;
771 // JVMSpec| attribute_info attributes[attributes_count];
772 void JvmtiClassFileReconstituter::write_class_attributes() {
773 u2 inner_classes_length = inner_classes_attribute_length();
774 Symbol* generic_signature = ik()->generic_signature();
775 AnnotationArray* anno = ik()->class_annotations();
776 AnnotationArray* type_anno = ik()->class_type_annotations();
777
778 int attr_count = 0;
779 if (generic_signature != NULL) {
780 ++attr_count;
781 }
782 if (ik()->source_file_name() != NULL) {
783 ++attr_count;
784 }
785 if (ik()->source_debug_extension() != NULL) {
786 ++attr_count;
787 }
788 if (inner_classes_length > 0) {
789 ++attr_count;
790 }
791 if (anno != NULL) {
792 ++attr_count; // has RuntimeVisibleAnnotations attribute
793 }
794 if (type_anno != NULL) {
795 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
796 }
797 if (cpool()->operands() != NULL) {
798 ++attr_count;
799 }
800 if (ik()->nest_host_index() != 0) {
801 ++attr_count;
802 }
803 if (ik()->nest_members() != Universe::the_empty_short_array()) {
804 ++attr_count;
805 }
806 if (ik()->permitted_subclasses() != Universe::the_empty_short_array()) {
807 ++attr_count;
808 }
809 if (ik()->record_components() != NULL) {
810 ++attr_count;
811 }
812
813 write_u2(attr_count);
814
815 if (generic_signature != NULL) {
816 write_signature_attribute(symbol_to_cpool_index(generic_signature));
817 }
818 if (ik()->source_file_name() != NULL) {
819 write_source_file_attribute();
820 }
821 if (ik()->source_debug_extension() != NULL) {
822 write_source_debug_extension_attribute();
823 }
824 if (anno != NULL) {
825 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
826 }
827 if (type_anno != NULL) {
828 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
829 }
830 if (ik()->nest_host_index() != 0) {
831 write_nest_host_attribute();
832 }
833 if (ik()->nest_members() != Universe::the_empty_short_array()) {
834 write_nest_members_attribute();
835 }
836 if (ik()->permitted_subclasses() != Universe::the_empty_short_array()) {
837 write_permitted_subclasses_attribute();
838 }
839 if (ik()->record_components() != NULL) {
840 write_record_attribute();
841 }
842 if (cpool()->operands() != NULL) {
843 write_bootstrapmethod_attribute();
844 }
845 if (inner_classes_length > 0) {
846 write_inner_classes_attribute(inner_classes_length);
847 }
848 }
849
850 // Write the method information portion of ClassFile structure
851 // JVMSpec| u2 methods_count;
852 // JVMSpec| method_info methods[methods_count];
853 void JvmtiClassFileReconstituter::write_method_infos() {
854 HandleMark hm(thread());
855 Array<Method*>* methods = ik()->methods();
856 int num_methods = methods->length();
857 int num_overpass = 0;
858
859 // count the generated default interface methods
860 // these will not be re-created by write_method_info
861 // and should not be included in the total count
862 for (int index = 0; index < num_methods; index++) {
863 Method* method = methods->at(index);
864 if (method->is_overpass()) {
865 num_overpass++;
866 }
867 }
868
869 write_u2(num_methods - num_overpass);
870 if (JvmtiExport::can_maintain_original_method_order()) {
871 int index;
872 int original_index;
873 intArray method_order(num_methods, num_methods, 0);
874
875 // invert the method order mapping
876 for (index = 0; index < num_methods; index++) {
877 original_index = ik()->method_ordering()->at(index);
878 assert(original_index >= 0 && original_index < num_methods,
879 "invalid original method index");
880 method_order.at_put(original_index, index);
881 }
882
883 // write in original order
884 for (original_index = 0; original_index < num_methods; original_index++) {
885 index = method_order.at(original_index);
886 methodHandle method(thread(), methods->at(index));
887 write_method_info(method);
888 }
889 } else {
890 // method order not preserved just dump the method infos
891 for (int index = 0; index < num_methods; index++) {
892 methodHandle method(thread(), methods->at(index));
893 write_method_info(method);
894 }
895 }
896 }
897
898 void JvmtiClassFileReconstituter::write_class_file_format() {
899 ReallocMark();
900
901 // JVMSpec| ClassFile {
902 // JVMSpec| u4 magic;
903 write_u4(0xCAFEBABE);
904
905 // JVMSpec| u2 minor_version;
906 // JVMSpec| u2 major_version;
907 write_u2(ik()->minor_version());
908 u2 major = ik()->major_version();
909 write_u2(major);
910
911 // JVMSpec| u2 constant_pool_count;
912 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
913 write_u2(cpool()->length());
914 copy_cpool_bytes(writeable_address(cpool_size()));
915
916 // JVMSpec| u2 access_flags;
917 write_u2(ik()->access_flags().get_flags() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIMITIVE | JVM_ACC_VALUE | JVM_ACC_PERMITS_VALUE));
918 // JVMSpec| u2 this_class;
919 // JVMSpec| u2 super_class;
920 write_u2(class_symbol_to_cpool_index(ik()->name()));
921 Klass* super_class = ik()->super();
922 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
923 class_symbol_to_cpool_index(super_class->name()));
924
925 // JVMSpec| u2 interfaces_count;
926 // JVMSpec| u2 interfaces[interfaces_count];
927 Array<InstanceKlass*>* interfaces = ik()->local_interfaces();
928 int num_interfaces = interfaces->length();
929 write_u2(num_interfaces);
930
931 for (int index = 0; index < num_interfaces; index++) {
932 HandleMark hm(thread());
933 InstanceKlass* iik = interfaces->at(index);
934 write_u2(class_symbol_to_cpool_index(iik->name()));
935 }
936
937 // JVMSpec| u2 fields_count;
938 // JVMSpec| field_info fields[fields_count];
939 write_field_infos();
940
941 // JVMSpec| u2 methods_count;
942 // JVMSpec| method_info methods[methods_count];
943 write_method_infos();
944
945 // JVMSpec| u2 attributes_count;
946 // JVMSpec| attribute_info attributes[attributes_count];
947 // JVMSpec| } /* end ClassFile 8?
948 write_class_attributes();
949 }
950
951 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
952 size_t used_size = _buffer_ptr - _buffer;
953 if (size + used_size >= _buffer_size) {
954 // compute the new buffer size: must be at least twice as big as before
955 // plus whatever new is being used; then convert to nice clean block boundary
956 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
957 * initial_buffer_size;
958
959 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
960 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
961 _buffer_size = new_buffer_size;
962 _buffer_ptr = _buffer + used_size;
963 }
964 u1* ret_ptr = _buffer_ptr;
965 _buffer_ptr += size;
966 return ret_ptr;
967 }
968
969 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
970 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
971 assert(sym != NULL, "attribute name symbol not found");
972 u2 attr_name_index = symbol_to_cpool_index(sym);
973 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
974 write_u2(attr_name_index);
975 }
976
977 void JvmtiClassFileReconstituter::write_u1(u1 x) {
978 *writeable_address(1) = x;
979 }
980
981 void JvmtiClassFileReconstituter::write_u2(u2 x) {
982 Bytes::put_Java_u2(writeable_address(2), x);
983 }
984
985 void JvmtiClassFileReconstituter::write_u4(u4 x) {
986 Bytes::put_Java_u4(writeable_address(4), x);
987 }
988
989 void JvmtiClassFileReconstituter::write_u8(u8 x) {
990 Bytes::put_Java_u8(writeable_address(8), x);
991 }
992
993 void JvmtiClassFileReconstituter::copy_bytecodes(const methodHandle& mh,
994 unsigned char* bytecodes) {
995 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
996 // and the breakpoint bytecode are converted to their original bytecodes.
997
998 BytecodeStream bs(mh);
999
1000 unsigned char* p = bytecodes;
1001 Bytecodes::Code code;
1002 bool is_rewritten = mh->method_holder()->is_rewritten();
1003
1004 while ((code = bs.next()) >= 0) {
1005 assert(Bytecodes::is_java_code(code), "sanity check");
1006 assert(code != Bytecodes::_breakpoint, "sanity check");
1007
1008 // length of bytecode (mnemonic + operands)
1009 address bcp = bs.bcp();
1010 int len = bs.instruction_size();
1011 assert(len > 0, "length must be > 0");
1012
1013 // copy the bytecodes
1014 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
1015 if (len > 1) {
1016 memcpy(p+1, bcp+1, len-1);
1017 }
1018
1019 // During linking the get/put and invoke instructions are rewritten
1020 // with an index into the constant pool cache. The original constant
1021 // pool index must be returned to caller. Rewrite the index.
1022 if (is_rewritten && len > 1) {
1023 bool is_wide = false;
1024 switch (code) {
1025 case Bytecodes::_getstatic : // fall through
1026 case Bytecodes::_putstatic : // fall through
1027 case Bytecodes::_getfield : // fall through
1028 case Bytecodes::_putfield : // fall through
1029 case Bytecodes::_withfield : // fall through
1030 case Bytecodes::_invokevirtual : // fall through
1031 case Bytecodes::_invokespecial : // fall through
1032 case Bytecodes::_invokestatic : // fall through
1033 case Bytecodes::_invokedynamic : // fall through
1034 case Bytecodes::_invokeinterface : {
1035 assert(len == 3 ||
1036 (code == Bytecodes::_invokeinterface && len == 5) ||
1037 (code == Bytecodes::_invokedynamic && len == 5),
1038 "sanity check");
1039
1040 int cpci = Bytes::get_native_u2(bcp+1);
1041 bool is_invokedynamic = (code == Bytecodes::_invokedynamic);
1042 ConstantPoolCacheEntry* entry;
1043 if (is_invokedynamic) {
1044 cpci = Bytes::get_native_u4(bcp+1);
1045 entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
1046 } else {
1047 // cache cannot be pre-fetched since some classes won't have it yet
1048 entry = mh->constants()->cache()->entry_at(cpci);
1049 }
1050 int i = entry->constant_pool_index();
1051 assert(i < mh->constants()->length(), "sanity check");
1052 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
1053 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
1054 break;
1055 }
1056 case Bytecodes::_ldc_w:
1057 is_wide = true; // fall through
1058 case Bytecodes::_ldc: {
1059 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
1060 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
1061 int i = mh->constants()->object_to_cp_index(cpci);
1062 assert(i < mh->constants()->length(), "sanity check");
1063 if (is_wide) {
1064 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
1065 } else {
1066 *(p+1) = (u1)i;
1067 }
1068 }
1069 break;
1070 }
1071 default:
1072 break;
1073 }
1074 }
1075
1076 p += len;
1077 }
1078 }