1 /*
2 * Copyright (c) 2005, 2021, 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 SourceFile attribute
292 // JVMSpec| SourceFile_attribute {
293 // JVMSpec| u2 attribute_name_index;
294 // JVMSpec| u4 attribute_length;
295 // JVMSpec| u2 sourcefile_index;
296 // JVMSpec| }
297 void JvmtiClassFileReconstituter::write_source_file_attribute() {
298 assert(ik()->source_file_name() != NULL, "caller must check");
299
300 write_attribute_name_index("SourceFile");
301 write_u4(2); // always length 2
302 write_u2(symbol_to_cpool_index(ik()->source_file_name()));
303 }
304
305 // Write SourceDebugExtension attribute
306 // JSR45| SourceDebugExtension_attribute {
307 // JSR45| u2 attribute_name_index;
308 // JSR45| u4 attribute_length;
309 // JSR45| u1 debug_extension[attribute_length];
310 // JSR45| }
311 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
312 assert(ik()->source_debug_extension() != NULL, "caller must check");
313
314 write_attribute_name_index("SourceDebugExtension");
315 int len = (int)strlen(ik()->source_debug_extension());
316 write_u4(len);
317 u1* ext = (u1*)ik()->source_debug_extension();
318 for (int i=0; i<len; i++) {
319 write_u1(ext[i]);
320 }
321 }
322
323 // Write (generic) Signature attribute
324 // JVMSpec| Signature_attribute {
325 // JVMSpec| u2 attribute_name_index;
326 // JVMSpec| u4 attribute_length;
327 // JVMSpec| u2 signature_index;
328 // JVMSpec| }
329 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
330 write_attribute_name_index("Signature");
331 write_u4(2); // always length 2
332 write_u2(generic_signature_index);
333 }
334
335 // Compute the number of entries in the InnerClasses attribute
336 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
337 InnerClassesIterator iter(ik());
338 return iter.length();
339 }
340
341 // Write an annotation attribute. The VM stores them in raw form, so all we need
342 // to do is add the attrubute name and fill in the length.
343 // JSR202| *Annotations_attribute {
344 // JSR202| u2 attribute_name_index;
345 // JSR202| u4 attribute_length;
346 // JSR202| ...
347 // JSR202| }
348 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
349 AnnotationArray* annos) {
350 u4 length = annos->length();
351 write_attribute_name_index(attr_name);
352 write_u4(length);
353 memcpy(writeable_address(length), annos->adr_at(0), length);
354 }
355
356 // BootstrapMethods_attribute {
357 // u2 attribute_name_index;
358 // u4 attribute_length;
359 // u2 num_bootstrap_methods;
360 // { u2 bootstrap_method_ref;
361 // u2 num_bootstrap_arguments;
362 // u2 bootstrap_arguments[num_bootstrap_arguments];
363 // } bootstrap_methods[num_bootstrap_methods];
364 // }
365 void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {
366 Array<u2>* operands = cpool()->operands();
367 write_attribute_name_index("BootstrapMethods");
368 int num_bootstrap_methods = ConstantPool::operand_array_length(operands);
369
370 // calculate length of attribute
371 int length = sizeof(u2); // num_bootstrap_methods
372 for (int n = 0; n < num_bootstrap_methods; n++) {
373 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
374 length += sizeof(u2); // bootstrap_method_ref
375 length += sizeof(u2); // num_bootstrap_arguments
376 length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments]
377 }
378 write_u4(length);
379
380 // write attribute
381 write_u2(num_bootstrap_methods);
382 for (int n = 0; n < num_bootstrap_methods; n++) {
383 u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n);
384 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
385 write_u2(bootstrap_method_ref);
386 write_u2(num_bootstrap_arguments);
387 for (int arg = 0; arg < num_bootstrap_arguments; arg++) {
388 u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg);
389 write_u2(bootstrap_argument);
390 }
391 }
392 }
393
394 // NestHost_attribute {
395 // u2 attribute_name_index;
396 // u4 attribute_length;
397 // u2 host_class_index;
398 // }
399 void JvmtiClassFileReconstituter::write_nest_host_attribute() {
400 int length = sizeof(u2);
401 int host_class_index = ik()->nest_host_index();
402
403 write_attribute_name_index("NestHost");
404 write_u4(length);
405 write_u2(host_class_index);
406 }
407
408 // NestMembers_attribute {
409 // u2 attribute_name_index;
410 // u4 attribute_length;
411 // u2 number_of_classes;
412 // u2 classes[number_of_classes];
413 // }
414 void JvmtiClassFileReconstituter::write_nest_members_attribute() {
415 Array<u2>* nest_members = ik()->nest_members();
416 int number_of_classes = nest_members->length();
417 int length = sizeof(u2) * (1 + number_of_classes);
418
419 write_attribute_name_index("NestMembers");
420 write_u4(length);
421 write_u2(number_of_classes);
422 for (int i = 0; i < number_of_classes; i++) {
423 u2 class_cp_index = nest_members->at(i);
424 write_u2(class_cp_index);
425 }
426 }
427
428 // PermittedSubclasses {
429 // u2 attribute_name_index;
430 // u4 attribute_length;
431 // u2 number_of_classes;
432 // u2 classes[number_of_classes];
433 // }
434 void JvmtiClassFileReconstituter::write_permitted_subclasses_attribute() {
435 Array<u2>* permitted_subclasses = ik()->permitted_subclasses();
436 int number_of_classes = permitted_subclasses->length();
437 int length = sizeof(u2) * (1 + number_of_classes); // '1 +' is for number_of_classes field
438
439 write_attribute_name_index("PermittedSubclasses");
440 write_u4(length);
441 write_u2(number_of_classes);
442 for (int i = 0; i < number_of_classes; i++) {
443 u2 class_cp_index = permitted_subclasses->at(i);
444 write_u2(class_cp_index);
445 }
446 }
447
448 // Record {
449 // u2 attribute_name_index;
450 // u4 attribute_length;
451 // u2 components_count;
452 // component_info components[components_count];
453 // }
454 // component_info {
455 // u2 name_index;
456 // u2 descriptor_index
457 // u2 attributes_count;
458 // attribute_info_attributes[attributes_count];
459 // }
460 void JvmtiClassFileReconstituter::write_record_attribute() {
461 Array<RecordComponent*>* components = ik()->record_components();
462 int number_of_components = components->length();
463
464 // Each component has a u2 for name, descr, attribute count
465 int length = sizeof(u2) + (sizeof(u2) * 3 * number_of_components);
466 for (int x = 0; x < number_of_components; x++) {
467 RecordComponent* component = components->at(x);
468 if (component->generic_signature_index() != 0) {
469 length += 8; // Signature attribute size
470 assert(component->attributes_count() > 0, "Bad component attributes count");
471 }
472 if (component->annotations() != NULL) {
473 length += 6 + component->annotations()->length();
474 }
475 if (component->type_annotations() != NULL) {
476 length += 6 + component->type_annotations()->length();
477 }
478 }
479
480 write_attribute_name_index("Record");
481 write_u4(length);
482 write_u2(number_of_components);
483 for (int i = 0; i < number_of_components; i++) {
484 RecordComponent* component = components->at(i);
485 write_u2(component->name_index());
486 write_u2(component->descriptor_index());
487 write_u2(component->attributes_count());
488 if (component->generic_signature_index() != 0) {
489 write_signature_attribute(component->generic_signature_index());
490 }
491 if (component->annotations() != NULL) {
492 write_annotations_attribute("RuntimeVisibleAnnotations", component->annotations());
493 }
494 if (component->type_annotations() != NULL) {
495 write_annotations_attribute("RuntimeVisibleTypeAnnotations", component->type_annotations());
496 }
497 }
498 }
499
500 // Write InnerClasses attribute
501 // JVMSpec| InnerClasses_attribute {
502 // JVMSpec| u2 attribute_name_index;
503 // JVMSpec| u4 attribute_length;
504 // JVMSpec| u2 number_of_classes;
505 // JVMSpec| { u2 inner_class_info_index;
506 // JVMSpec| u2 outer_class_info_index;
507 // JVMSpec| u2 inner_name_index;
508 // JVMSpec| u2 inner_class_access_flags;
509 // JVMSpec| } classes[number_of_classes];
510 // JVMSpec| }
511 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
512 InnerClassesIterator iter(ik());
513 guarantee(iter.length() != 0 && iter.length() == length,
514 "caller must check");
515 u2 entry_count = length / InstanceKlass::inner_class_next_offset;
516 u4 size = 2 + entry_count * (2+2+2+2);
517
518 write_attribute_name_index("InnerClasses");
519 write_u4(size);
520 write_u2(entry_count);
521 for (; !iter.done(); iter.next()) {
522 write_u2(iter.inner_class_info_index());
523 write_u2(iter.outer_class_info_index());
524 write_u2(iter.inner_name_index());
525 write_u2(iter.inner_access_flags());
526 }
527 }
528
529 // Write Synthetic attribute
530 // JVMSpec| Synthetic_attribute {
531 // JVMSpec| u2 attribute_name_index;
532 // JVMSpec| u4 attribute_length;
533 // JVMSpec| }
534 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
535 write_attribute_name_index("Synthetic");
536 write_u4(0); //length always zero
537 }
538
539 // Compute size of LineNumberTable
540 u2 JvmtiClassFileReconstituter::line_number_table_entries(const methodHandle& method) {
541 // The line number table is compressed so we don't know how big it is until decompressed.
542 // Decompression is really fast so we just do it twice.
543 u2 num_entries = 0;
544 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
545 while (stream.read_pair()) {
546 num_entries++;
547 }
548 return num_entries;
549 }
550
551 // Write LineNumberTable attribute
552 // JVMSpec| LineNumberTable_attribute {
553 // JVMSpec| u2 attribute_name_index;
554 // JVMSpec| u4 attribute_length;
555 // JVMSpec| u2 line_number_table_length;
556 // JVMSpec| { u2 start_pc;
557 // JVMSpec| u2 line_number;
558 // JVMSpec| } line_number_table[line_number_table_length];
559 // JVMSpec| }
560 void JvmtiClassFileReconstituter::write_line_number_table_attribute(const methodHandle& method,
561 u2 num_entries) {
562
563 write_attribute_name_index("LineNumberTable");
564 write_u4(2 + num_entries * (2 + 2));
565 write_u2(num_entries);
566
567 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
568 while (stream.read_pair()) {
569 write_u2(stream.bci());
570 write_u2(stream.line());
571 }
572 }
573
574 // Write LocalVariableTable attribute
575 // JVMSpec| LocalVariableTable_attribute {
576 // JVMSpec| u2 attribute_name_index;
577 // JVMSpec| u4 attribute_length;
578 // JVMSpec| u2 local_variable_table_length;
579 // JVMSpec| { u2 start_pc;
580 // JVMSpec| u2 length;
581 // JVMSpec| u2 name_index;
582 // JVMSpec| u2 descriptor_index;
583 // JVMSpec| u2 index;
584 // JVMSpec| } local_variable_table[local_variable_table_length];
585 // JVMSpec| }
586 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(const methodHandle& method, u2 num_entries) {
587 write_attribute_name_index("LocalVariableTable");
588 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
589 write_u2(num_entries);
590
591 assert(method->localvariable_table_length() == num_entries, "just checking");
592
593 LocalVariableTableElement *elem = method->localvariable_table_start();
594 for (int j=0; j<method->localvariable_table_length(); j++) {
595 write_u2(elem->start_bci);
596 write_u2(elem->length);
597 write_u2(elem->name_cp_index);
598 write_u2(elem->descriptor_cp_index);
599 write_u2(elem->slot);
600 elem++;
601 }
602 }
603
604 // Write LocalVariableTypeTable attribute
605 // JVMSpec| LocalVariableTypeTable_attribute {
606 // JVMSpec| u2 attribute_name_index;
607 // JVMSpec| u4 attribute_length;
608 // JVMSpec| u2 local_variable_type_table_length;
609 // JVMSpec| { u2 start_pc;
610 // JVMSpec| u2 length;
611 // JVMSpec| u2 name_index;
612 // JVMSpec| u2 signature_index;
613 // JVMSpec| u2 index;
614 // JVMSpec| } local_variable_type_table[local_variable_type_table_length];
615 // JVMSpec| }
616 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries) {
617 write_attribute_name_index("LocalVariableTypeTable");
618 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
619 write_u2(num_entries);
620
621 LocalVariableTableElement *elem = method->localvariable_table_start();
622 for (int j=0; j<method->localvariable_table_length(); j++) {
623 if (elem->signature_cp_index > 0) {
624 // Local variable has a generic signature - write LVTT attribute entry
625 write_u2(elem->start_bci);
626 write_u2(elem->length);
627 write_u2(elem->name_cp_index);
628 write_u2(elem->signature_cp_index);
629 write_u2(elem->slot);
630 num_entries--;
631 }
632 elem++;
633 }
634 assert(num_entries == 0, "just checking");
635 }
636
637 // Write stack map table attribute
638 // JSR-202| StackMapTable_attribute {
639 // JSR-202| u2 attribute_name_index;
640 // JSR-202| u4 attribute_length;
641 // JSR-202| u2 number_of_entries;
642 // JSR-202| stack_map_frame_entries[number_of_entries];
643 // JSR-202| }
644 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(const methodHandle& method,
645 int stackmap_len) {
646
647 write_attribute_name_index("StackMapTable");
648 write_u4(stackmap_len);
649 memcpy(
650 writeable_address(stackmap_len),
651 (void*)(method->stackmap_data()->adr_at(0)),
652 stackmap_len);
653 }
654
655 // Write one method_info structure
656 // JVMSpec| method_info {
657 // JVMSpec| u2 access_flags;
658 // JVMSpec| u2 name_index;
659 // JVMSpec| u2 descriptor_index;
660 // JVMSpec| u2 attributes_count;
661 // JVMSpec| attribute_info attributes[attributes_count];
662 // JVMSpec| }
663 void JvmtiClassFileReconstituter::write_method_info(const methodHandle& method) {
664 AccessFlags access_flags = method->access_flags();
665 ConstMethod* const_method = method->constMethod();
666 u2 generic_signature_index = const_method->generic_signature_index();
667 AnnotationArray* anno = method->annotations();
668 AnnotationArray* param_anno = method->parameter_annotations();
669 AnnotationArray* default_anno = method->annotation_default();
670 AnnotationArray* type_anno = method->type_annotations();
671
672 // skip generated default interface methods
673 if (method->is_overpass()) {
674 return;
675 }
676
677 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
678 write_u2(const_method->name_index());
679 write_u2(const_method->signature_index());
680
681 // write attributes in the same order javac does, so we can test with byte for
682 // byte comparison
683 int attr_count = 0;
684 if (const_method->code_size() != 0) {
685 ++attr_count; // has Code attribute
686 }
687 if (const_method->has_checked_exceptions()) {
688 ++attr_count; // has Exceptions attribute
689 }
690 if (default_anno != NULL) {
691 ++attr_count; // has AnnotationDefault attribute
692 }
693 // Deprecated attribute would go here
694 if (access_flags.is_synthetic()) { // FIXME
695 // ++attr_count;
696 }
697 if (generic_signature_index != 0) {
698 ++attr_count;
699 }
700 if (anno != NULL) {
701 ++attr_count; // has RuntimeVisibleAnnotations attribute
702 }
703 if (param_anno != NULL) {
704 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
705 }
706 if (type_anno != NULL) {
707 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
708 }
709
710 write_u2(attr_count);
711 if (const_method->code_size() > 0) {
712 write_code_attribute(method);
713 }
714 if (const_method->has_checked_exceptions()) {
715 write_exceptions_attribute(const_method);
716 }
717 if (default_anno != NULL) {
718 write_annotations_attribute("AnnotationDefault", default_anno);
719 }
720 // Deprecated attribute would go here
721 if (access_flags.is_synthetic()) {
722 // write_synthetic_attribute();
723 }
724 if (generic_signature_index != 0) {
725 write_signature_attribute(generic_signature_index);
726 }
727 if (anno != NULL) {
728 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
729 }
730 if (param_anno != NULL) {
731 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
732 }
733 if (type_anno != NULL) {
734 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
735 }
736 }
737
738 // Write the class attributes portion of ClassFile structure
739 // JVMSpec| u2 attributes_count;
740 // JVMSpec| attribute_info attributes[attributes_count];
741 void JvmtiClassFileReconstituter::write_class_attributes() {
742 u2 inner_classes_length = inner_classes_attribute_length();
743 Symbol* generic_signature = ik()->generic_signature();
744 AnnotationArray* anno = ik()->class_annotations();
745 AnnotationArray* type_anno = ik()->class_type_annotations();
746
747 int attr_count = 0;
748 if (generic_signature != NULL) {
749 ++attr_count;
750 }
751 if (ik()->source_file_name() != NULL) {
752 ++attr_count;
753 }
754 if (ik()->source_debug_extension() != NULL) {
755 ++attr_count;
756 }
757 if (inner_classes_length > 0) {
758 ++attr_count;
759 }
760 if (anno != NULL) {
761 ++attr_count; // has RuntimeVisibleAnnotations attribute
762 }
763 if (type_anno != NULL) {
764 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
765 }
766 if (cpool()->operands() != NULL) {
767 ++attr_count;
768 }
769 if (ik()->nest_host_index() != 0) {
770 ++attr_count;
771 }
772 if (ik()->nest_members() != Universe::the_empty_short_array()) {
773 ++attr_count;
774 }
775 if (ik()->permitted_subclasses() != Universe::the_empty_short_array()) {
776 ++attr_count;
777 }
778 if (ik()->record_components() != NULL) {
779 ++attr_count;
780 }
781
782 write_u2(attr_count);
783
784 if (generic_signature != NULL) {
785 write_signature_attribute(symbol_to_cpool_index(generic_signature));
786 }
787 if (ik()->source_file_name() != NULL) {
788 write_source_file_attribute();
789 }
790 if (ik()->source_debug_extension() != NULL) {
791 write_source_debug_extension_attribute();
792 }
793 if (anno != NULL) {
794 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
795 }
796 if (type_anno != NULL) {
797 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
798 }
799 if (ik()->nest_host_index() != 0) {
800 write_nest_host_attribute();
801 }
802 if (ik()->nest_members() != Universe::the_empty_short_array()) {
803 write_nest_members_attribute();
804 }
805 if (ik()->permitted_subclasses() != Universe::the_empty_short_array()) {
806 write_permitted_subclasses_attribute();
807 }
808 if (ik()->record_components() != NULL) {
809 write_record_attribute();
810 }
811 if (cpool()->operands() != NULL) {
812 write_bootstrapmethod_attribute();
813 }
814 if (inner_classes_length > 0) {
815 write_inner_classes_attribute(inner_classes_length);
816 }
817 }
818
819 // Write the method information portion of ClassFile structure
820 // JVMSpec| u2 methods_count;
821 // JVMSpec| method_info methods[methods_count];
822 void JvmtiClassFileReconstituter::write_method_infos() {
823 HandleMark hm(thread());
824 Array<Method*>* methods = ik()->methods();
825 int num_methods = methods->length();
826 int num_overpass = 0;
827
828 // count the generated default interface methods
829 // these will not be re-created by write_method_info
830 // and should not be included in the total count
831 for (int index = 0; index < num_methods; index++) {
832 Method* method = methods->at(index);
833 if (method->is_overpass()) {
834 num_overpass++;
835 }
836 }
837
838 write_u2(num_methods - num_overpass);
839 if (JvmtiExport::can_maintain_original_method_order()) {
840 int index;
841 int original_index;
842 intArray method_order(num_methods, num_methods, 0);
843
844 // invert the method order mapping
845 for (index = 0; index < num_methods; index++) {
846 original_index = ik()->method_ordering()->at(index);
847 assert(original_index >= 0 && original_index < num_methods,
848 "invalid original method index");
849 method_order.at_put(original_index, index);
850 }
851
852 // write in original order
853 for (original_index = 0; original_index < num_methods; original_index++) {
854 index = method_order.at(original_index);
855 methodHandle method(thread(), methods->at(index));
856 write_method_info(method);
857 }
858 } else {
859 // method order not preserved just dump the method infos
860 for (int index = 0; index < num_methods; index++) {
861 methodHandle method(thread(), methods->at(index));
862 write_method_info(method);
863 }
864 }
865 }
866
867 void JvmtiClassFileReconstituter::write_class_file_format() {
868 ReallocMark();
869
870 // JVMSpec| ClassFile {
871 // JVMSpec| u4 magic;
872 write_u4(0xCAFEBABE);
873
874 // JVMSpec| u2 minor_version;
875 // JVMSpec| u2 major_version;
876 write_u2(ik()->minor_version());
877 u2 major = ik()->major_version();
878 write_u2(major);
879
880 // JVMSpec| u2 constant_pool_count;
881 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
882 write_u2(cpool()->length());
883 copy_cpool_bytes(writeable_address(cpool_size()));
884
885 // JVMSpec| u2 access_flags;
886 write_u2(ik()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
887
888 // JVMSpec| u2 this_class;
889 // JVMSpec| u2 super_class;
890 write_u2(class_symbol_to_cpool_index(ik()->name()));
891 Klass* super_class = ik()->super();
892 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
893 class_symbol_to_cpool_index(super_class->name()));
894
895 // JVMSpec| u2 interfaces_count;
896 // JVMSpec| u2 interfaces[interfaces_count];
897 Array<InstanceKlass*>* interfaces = ik()->local_interfaces();
898 int num_interfaces = interfaces->length();
899 write_u2(num_interfaces -
900 (ik()->has_injected_identityObject() || ik()->has_injected_primitiveObject() ? 1 : 0));
901
902 for (int index = 0; index < num_interfaces; index++) {
903 HandleMark hm(thread());
904 InstanceKlass* iik = interfaces->at(index);
905 if ( (!ik()->has_injected_identityObject() || iik != vmClasses::IdentityObject_klass()) &&
906 (!ik()->has_injected_primitiveObject() || iik != vmClasses::PrimitiveObject_klass())) {
907 write_u2(class_symbol_to_cpool_index(iik->name()));
908 }
909 }
910
911 // JVMSpec| u2 fields_count;
912 // JVMSpec| field_info fields[fields_count];
913 write_field_infos();
914
915 // JVMSpec| u2 methods_count;
916 // JVMSpec| method_info methods[methods_count];
917 write_method_infos();
918
919 // JVMSpec| u2 attributes_count;
920 // JVMSpec| attribute_info attributes[attributes_count];
921 // JVMSpec| } /* end ClassFile 8?
922 write_class_attributes();
923 }
924
925 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
926 size_t used_size = _buffer_ptr - _buffer;
927 if (size + used_size >= _buffer_size) {
928 // compute the new buffer size: must be at least twice as big as before
929 // plus whatever new is being used; then convert to nice clean block boundary
930 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
931 * initial_buffer_size;
932
933 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
934 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
935 _buffer_size = new_buffer_size;
936 _buffer_ptr = _buffer + used_size;
937 }
938 u1* ret_ptr = _buffer_ptr;
939 _buffer_ptr += size;
940 return ret_ptr;
941 }
942
943 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
944 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
945 assert(sym != NULL, "attribute name symbol not found");
946 u2 attr_name_index = symbol_to_cpool_index(sym);
947 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
948 write_u2(attr_name_index);
949 }
950
951 void JvmtiClassFileReconstituter::write_u1(u1 x) {
952 *writeable_address(1) = x;
953 }
954
955 void JvmtiClassFileReconstituter::write_u2(u2 x) {
956 Bytes::put_Java_u2(writeable_address(2), x);
957 }
958
959 void JvmtiClassFileReconstituter::write_u4(u4 x) {
960 Bytes::put_Java_u4(writeable_address(4), x);
961 }
962
963 void JvmtiClassFileReconstituter::write_u8(u8 x) {
964 Bytes::put_Java_u8(writeable_address(8), x);
965 }
966
967 void JvmtiClassFileReconstituter::copy_bytecodes(const methodHandle& mh,
968 unsigned char* bytecodes) {
969 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
970 // and the breakpoint bytecode are converted to their original bytecodes.
971
972 BytecodeStream bs(mh);
973
974 unsigned char* p = bytecodes;
975 Bytecodes::Code code;
976 bool is_rewritten = mh->method_holder()->is_rewritten();
977
978 while ((code = bs.next()) >= 0) {
979 assert(Bytecodes::is_java_code(code), "sanity check");
980 assert(code != Bytecodes::_breakpoint, "sanity check");
981
982 // length of bytecode (mnemonic + operands)
983 address bcp = bs.bcp();
984 int len = bs.instruction_size();
985 assert(len > 0, "length must be > 0");
986
987 // copy the bytecodes
988 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
989 if (len > 1) {
990 memcpy(p+1, bcp+1, len-1);
991 }
992
993 // During linking the get/put and invoke instructions are rewritten
994 // with an index into the constant pool cache. The original constant
995 // pool index must be returned to caller. Rewrite the index.
996 if (is_rewritten && len > 1) {
997 bool is_wide = false;
998 switch (code) {
999 case Bytecodes::_getstatic : // fall through
1000 case Bytecodes::_putstatic : // fall through
1001 case Bytecodes::_getfield : // fall through
1002 case Bytecodes::_putfield : // fall through
1003 case Bytecodes::_invokevirtual : // fall through
1004 case Bytecodes::_invokespecial : // fall through
1005 case Bytecodes::_invokestatic : // fall through
1006 case Bytecodes::_invokedynamic : // fall through
1007 case Bytecodes::_invokeinterface : {
1008 assert(len == 3 ||
1009 (code == Bytecodes::_invokeinterface && len == 5) ||
1010 (code == Bytecodes::_invokedynamic && len == 5),
1011 "sanity check");
1012
1013 int cpci = Bytes::get_native_u2(bcp+1);
1014 bool is_invokedynamic = (code == Bytecodes::_invokedynamic);
1015 ConstantPoolCacheEntry* entry;
1016 if (is_invokedynamic) {
1017 cpci = Bytes::get_native_u4(bcp+1);
1018 entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
1019 } else {
1020 // cache cannot be pre-fetched since some classes won't have it yet
1021 entry = mh->constants()->cache()->entry_at(cpci);
1022 }
1023 int i = entry->constant_pool_index();
1024 assert(i < mh->constants()->length(), "sanity check");
1025 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
1026 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
1027 break;
1028 }
1029 case Bytecodes::_ldc_w:
1030 is_wide = true; // fall through
1031 case Bytecodes::_ldc: {
1032 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
1033 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
1034 int i = mh->constants()->object_to_cp_index(cpci);
1035 assert(i < mh->constants()->length(), "sanity check");
1036 if (is_wide) {
1037 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
1038 } else {
1039 *(p+1) = (u1)i;
1040 }
1041 }
1042 break;
1043 }
1044 default:
1045 break;
1046 }
1047 }
1048
1049 p += len;
1050 }
1051 }