1 /*
2 * Copyright (c) 2005, 2017, 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/handles.inline.hpp"
31 #include "runtime/signature.hpp"
32 #include "utilities/bytes.hpp"
33
34 // FIXME: add Deprecated attribute
35 // FIXME: fix Synthetic attribute
36 // FIXME: per Serguei, add error return handling for ConstantPool::copy_cpool_bytes()
37
38 JvmtiConstantPoolReconstituter::JvmtiConstantPoolReconstituter(InstanceKlass* ik) {
39 set_error(JVMTI_ERROR_NONE);
40 _ik = ik;
41 _cpool = constantPoolHandle(Thread::current(), ik->constants());
42 _symmap = new SymbolHashMap();
43 _classmap = new SymbolHashMap();
44 _cpool_size = _cpool->hash_entries_to(_symmap, _classmap);
45 if (_cpool_size == 0) {
46 set_error(JVMTI_ERROR_OUT_OF_MEMORY);
47 } else if (_cpool_size < 0) {
48 set_error(JVMTI_ERROR_INTERNAL);
49 }
50 }
51
52 // Write the field information portion of ClassFile structure
53 // JVMSpec| u2 fields_count;
54 // JVMSpec| field_info fields[fields_count];
55 void JvmtiClassFileReconstituter::write_field_infos() {
56 HandleMark hm(thread());
57 Array<AnnotationArray*>* fields_anno = ik()->fields_annotations();
58 Array<AnnotationArray*>* fields_type_anno = ik()->fields_type_annotations();
59
60 // Compute the real number of Java fields
61 int java_fields = ik()->java_fields_count();
62
63 write_u2(java_fields);
64 for (JavaFieldStream fs(ik()); !fs.done(); fs.next()) {
65 AccessFlags access_flags = fs.access_flags();
66 int name_index = fs.name_index();
67 int signature_index = fs.signature_index();
68 int initial_value_index = fs.initval_index();
69 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
70 // int offset = ik()->field_offset( index );
71 int generic_signature_index = fs.generic_signature_index();
72 AnnotationArray* anno = fields_anno == NULL ? NULL : fields_anno->at(fs.index());
73 AnnotationArray* type_anno = fields_type_anno == NULL ? NULL : fields_type_anno->at(fs.index());
74
75 // JVMSpec| field_info {
76 // JVMSpec| u2 access_flags;
77 // JVMSpec| u2 name_index;
78 // JVMSpec| u2 descriptor_index;
79 // JVMSpec| u2 attributes_count;
80 // JVMSpec| attribute_info attributes[attributes_count];
81 // JVMSpec| }
82
83 write_u2(access_flags.as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
84 write_u2(name_index);
85 write_u2(signature_index);
86 int attr_count = 0;
87 if (initial_value_index != 0) {
88 ++attr_count;
89 }
90 if (access_flags.is_synthetic()) {
91 // ++attr_count;
92 }
93 if (generic_signature_index != 0) {
94 ++attr_count;
95 }
96 if (anno != NULL) {
97 ++attr_count; // has RuntimeVisibleAnnotations attribute
98 }
99 if (type_anno != NULL) {
100 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
101 }
102
103 write_u2(attr_count);
104
105 if (initial_value_index != 0) {
106 write_attribute_name_index("ConstantValue");
107 write_u4(2); //length always 2
108 write_u2(initial_value_index);
109 }
110 if (access_flags.is_synthetic()) {
111 // write_synthetic_attribute();
112 }
113 if (generic_signature_index != 0) {
114 write_signature_attribute(generic_signature_index);
115 }
116 if (anno != NULL) {
117 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
118 }
119 if (type_anno != NULL) {
120 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
121 }
122 }
123 }
124
125 // Write Code attribute
126 // JVMSpec| Code_attribute {
127 // JVMSpec| u2 attribute_name_index;
128 // JVMSpec| u4 attribute_length;
129 // JVMSpec| u2 max_stack;
130 // JVMSpec| u2 max_locals;
131 // JVMSpec| u4 code_length;
132 // JVMSpec| u1 code[code_length];
133 // JVMSpec| u2 exception_table_length;
134 // JVMSpec| { u2 start_pc;
135 // JVMSpec| u2 end_pc;
136 // JVMSpec| u2 handler_pc;
137 // JVMSpec| u2 catch_type;
138 // JVMSpec| } exception_table[exception_table_length];
139 // JVMSpec| u2 attributes_count;
140 // JVMSpec| attribute_info attributes[attributes_count];
141 // JVMSpec| }
142 void JvmtiClassFileReconstituter::write_code_attribute(const methodHandle& method) {
143 ConstMethod* const_method = method->constMethod();
144 u2 line_num_cnt = 0;
145 int stackmap_len = 0;
146 int local_variable_table_length = 0;
147 int local_variable_type_table_length = 0;
148
149 // compute number and length of attributes
150 int attr_count = 0;
151 int attr_size = 0;
152 if (const_method->has_linenumber_table()) {
153 line_num_cnt = line_number_table_entries(method);
154 if (line_num_cnt != 0) {
155 ++attr_count;
156 // Compute the complete size of the line number table attribute:
157 // LineNumberTable_attribute {
158 // u2 attribute_name_index;
159 // u4 attribute_length;
160 // u2 line_number_table_length;
161 // { u2 start_pc;
162 // u2 line_number;
163 // } line_number_table[line_number_table_length];
164 // }
165 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
166 }
167 }
168 if (method->has_stackmap_table()) {
169 stackmap_len = method->stackmap_data()->length();
170 if (stackmap_len != 0) {
171 ++attr_count;
172 // Compute the size of the stack map table attribute (VM stores raw):
173 // StackMapTable_attribute {
174 // u2 attribute_name_index;
175 // u4 attribute_length;
176 // u2 number_of_entries;
177 // stack_map_frame_entries[number_of_entries];
178 // }
179 attr_size += 2 + 4 + stackmap_len;
180 }
181 }
182 if (method->has_localvariable_table()) {
183 local_variable_table_length = method->localvariable_table_length();
184 if (local_variable_table_length != 0) {
185 ++attr_count;
186 // Compute the size of the local variable table attribute (VM stores raw):
187 // LocalVariableTable_attribute {
188 // u2 attribute_name_index;
189 // u4 attribute_length;
190 // u2 local_variable_table_length;
191 // {
192 // u2 start_pc;
193 // u2 length;
194 // u2 name_index;
195 // u2 descriptor_index;
196 // u2 index;
197 // }
198 attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2);
199
200 // Local variables with generic signatures must have LVTT entries
201 LocalVariableTableElement *elem = method->localvariable_table_start();
202 for (int idx = 0; idx < local_variable_table_length; idx++) {
203 if (elem[idx].signature_cp_index != 0) {
204 local_variable_type_table_length++;
205 }
206 }
207
208 if (local_variable_type_table_length != 0) {
209 ++attr_count;
210 // Compute the size of the local variable type table attribute (VM stores raw):
211 // LocalVariableTypeTable_attribute {
212 // u2 attribute_name_index;
213 // u4 attribute_length;
214 // u2 local_variable_type_table_length;
215 // {
216 // u2 start_pc;
217 // u2 length;
218 // u2 name_index;
219 // u2 signature_index;
220 // u2 index;
221 // }
222 attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2);
223 }
224 }
225 }
226
227 ExceptionTable exception_table(method());
228 int exception_table_length = exception_table.length();
229 int code_size = const_method->code_size();
230 int size =
231 2+2+4 + // max_stack, max_locals, code_length
232 code_size + // code
233 2 + // exception_table_length
234 (2+2+2+2) * exception_table_length + // exception_table
235 2 + // attributes_count
236 attr_size; // attributes
237
238 write_attribute_name_index("Code");
239 write_u4(size);
240 write_u2(method->verifier_max_stack());
241 write_u2(method->max_locals());
242 write_u4(code_size);
243 copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
244 write_u2(exception_table_length);
245 for (int index = 0; index < exception_table_length; index++) {
246 write_u2(exception_table.start_pc(index));
247 write_u2(exception_table.end_pc(index));
248 write_u2(exception_table.handler_pc(index));
249 write_u2(exception_table.catch_type_index(index));
250 }
251 write_u2(attr_count);
252 if (line_num_cnt != 0) {
253 write_line_number_table_attribute(method, line_num_cnt);
254 }
255 if (stackmap_len != 0) {
256 write_stackmap_table_attribute(method, stackmap_len);
257 }
258 if (local_variable_table_length != 0) {
259 write_local_variable_table_attribute(method, local_variable_table_length);
260 }
261 if (local_variable_type_table_length != 0) {
262 write_local_variable_type_table_attribute(method, local_variable_type_table_length);
263 }
264 }
265
266 // Write Exceptions attribute
267 // JVMSpec| Exceptions_attribute {
268 // JVMSpec| u2 attribute_name_index;
269 // JVMSpec| u4 attribute_length;
270 // JVMSpec| u2 number_of_exceptions;
271 // JVMSpec| u2 exception_index_table[number_of_exceptions];
272 // JVMSpec| }
273 void JvmtiClassFileReconstituter::write_exceptions_attribute(ConstMethod* const_method) {
274 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
275 int checked_exceptions_length = const_method->checked_exceptions_length();
276 int size =
277 2 + // number_of_exceptions
278 2 * checked_exceptions_length; // exception_index_table
279
280 write_attribute_name_index("Exceptions");
281 write_u4(size);
282 write_u2(checked_exceptions_length);
283 for (int index = 0; index < checked_exceptions_length; index++) {
284 write_u2(checked_exceptions[index].class_cp_index);
285 }
286 }
287
288 // Write SourceFile attribute
289 // JVMSpec| SourceFile_attribute {
290 // JVMSpec| u2 attribute_name_index;
291 // JVMSpec| u4 attribute_length;
292 // JVMSpec| u2 sourcefile_index;
293 // JVMSpec| }
294 void JvmtiClassFileReconstituter::write_source_file_attribute() {
295 assert(ik()->source_file_name() != NULL, "caller must check");
296
297 write_attribute_name_index("SourceFile");
298 write_u4(2); // always length 2
299 write_u2(symbol_to_cpool_index(ik()->source_file_name()));
300 }
301
302 // Write SourceDebugExtension attribute
303 // JSR45| SourceDebugExtension_attribute {
304 // JSR45| u2 attribute_name_index;
305 // JSR45| u4 attribute_length;
306 // JSR45| u1 debug_extension[attribute_length];
307 // JSR45| }
308 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
309 assert(ik()->source_debug_extension() != NULL, "caller must check");
310
311 write_attribute_name_index("SourceDebugExtension");
312 int len = (int)strlen(ik()->source_debug_extension());
313 write_u4(len);
314 u1* ext = (u1*)ik()->source_debug_extension();
315 for (int i=0; i<len; i++) {
316 write_u1(ext[i]);
317 }
318 }
319
320 // Write (generic) Signature attribute
321 // JVMSpec| Signature_attribute {
322 // JVMSpec| u2 attribute_name_index;
323 // JVMSpec| u4 attribute_length;
324 // JVMSpec| u2 signature_index;
325 // JVMSpec| }
326 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
327 write_attribute_name_index("Signature");
328 write_u4(2); // always length 2
329 write_u2(generic_signature_index);
330 }
331
332 // Compute the number of entries in the InnerClasses attribute
333 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
334 InnerClassesIterator iter(ik());
335 return iter.length();
336 }
337
338 // Write an annotation attribute. The VM stores them in raw form, so all we need
339 // to do is add the attrubute name and fill in the length.
340 // JSR202| *Annotations_attribute {
341 // JSR202| u2 attribute_name_index;
342 // JSR202| u4 attribute_length;
343 // JSR202| ...
344 // JSR202| }
345 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
346 AnnotationArray* annos) {
347 u4 length = annos->length();
348 write_attribute_name_index(attr_name);
349 write_u4(length);
350 memcpy(writeable_address(length), annos->adr_at(0), length);
351 }
352
353 // BootstrapMethods_attribute {
354 // u2 attribute_name_index;
355 // u4 attribute_length;
356 // u2 num_bootstrap_methods;
357 // { u2 bootstrap_method_ref;
358 // u2 num_bootstrap_arguments;
359 // u2 bootstrap_arguments[num_bootstrap_arguments];
360 // } bootstrap_methods[num_bootstrap_methods];
361 // }
362 void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {
363 Array<u2>* operands = cpool()->operands();
364 write_attribute_name_index("BootstrapMethods");
365 int num_bootstrap_methods = ConstantPool::operand_array_length(operands);
366
367 // calculate length of attribute
368 int length = sizeof(u2); // num_bootstrap_methods
369 for (int n = 0; n < num_bootstrap_methods; n++) {
370 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
371 length += sizeof(u2); // bootstrap_method_ref
372 length += sizeof(u2); // num_bootstrap_arguments
373 length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments]
374 }
375 write_u4(length);
376
377 // write attribute
378 write_u2(num_bootstrap_methods);
379 for (int n = 0; n < num_bootstrap_methods; n++) {
380 u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n);
381 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
382 write_u2(bootstrap_method_ref);
383 write_u2(num_bootstrap_arguments);
384 for (int arg = 0; arg < num_bootstrap_arguments; arg++) {
385 u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg);
386 write_u2(bootstrap_argument);
387 }
388 }
389 }
390
391
392 // Write InnerClasses attribute
393 // JVMSpec| InnerClasses_attribute {
394 // JVMSpec| u2 attribute_name_index;
395 // JVMSpec| u4 attribute_length;
396 // JVMSpec| u2 number_of_classes;
397 // JVMSpec| { u2 inner_class_info_index;
398 // JVMSpec| u2 outer_class_info_index;
399 // JVMSpec| u2 inner_name_index;
400 // JVMSpec| u2 inner_class_access_flags;
401 // JVMSpec| } classes[number_of_classes];
402 // JVMSpec| }
403 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
404 InnerClassesIterator iter(ik());
405 guarantee(iter.length() != 0 && iter.length() == length,
406 "caller must check");
407 u2 entry_count = length / InstanceKlass::inner_class_next_offset;
408 u4 size = 2 + entry_count * (2+2+2+2);
409
410 write_attribute_name_index("InnerClasses");
411 write_u4(size);
412 write_u2(entry_count);
413 for (; !iter.done(); iter.next()) {
414 write_u2(iter.inner_class_info_index());
415 write_u2(iter.outer_class_info_index());
416 write_u2(iter.inner_name_index());
417 write_u2(iter.inner_access_flags());
418 }
419 }
420
421 // Write Synthetic attribute
422 // JVMSpec| Synthetic_attribute {
423 // JVMSpec| u2 attribute_name_index;
424 // JVMSpec| u4 attribute_length;
425 // JVMSpec| }
426 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
427 write_attribute_name_index("Synthetic");
428 write_u4(0); //length always zero
429 }
430
431 // Compute size of LineNumberTable
432 u2 JvmtiClassFileReconstituter::line_number_table_entries(const methodHandle& method) {
433 // The line number table is compressed so we don't know how big it is until decompressed.
434 // Decompression is really fast so we just do it twice.
435 u2 num_entries = 0;
436 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
437 while (stream.read_pair()) {
438 num_entries++;
439 }
440 return num_entries;
441 }
442
443 // Write LineNumberTable attribute
444 // JVMSpec| LineNumberTable_attribute {
445 // JVMSpec| u2 attribute_name_index;
446 // JVMSpec| u4 attribute_length;
447 // JVMSpec| u2 line_number_table_length;
448 // JVMSpec| { u2 start_pc;
449 // JVMSpec| u2 line_number;
450 // JVMSpec| } line_number_table[line_number_table_length];
451 // JVMSpec| }
452 void JvmtiClassFileReconstituter::write_line_number_table_attribute(const methodHandle& method,
453 u2 num_entries) {
454
455 write_attribute_name_index("LineNumberTable");
456 write_u4(2 + num_entries * (2 + 2));
457 write_u2(num_entries);
458
459 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
460 while (stream.read_pair()) {
461 write_u2(stream.bci());
462 write_u2(stream.line());
463 }
464 }
465
466 // Write LocalVariableTable attribute
467 // JVMSpec| LocalVariableTable_attribute {
468 // JVMSpec| u2 attribute_name_index;
469 // JVMSpec| u4 attribute_length;
470 // JVMSpec| u2 local_variable_table_length;
471 // JVMSpec| { u2 start_pc;
472 // JVMSpec| u2 length;
473 // JVMSpec| u2 name_index;
474 // JVMSpec| u2 descriptor_index;
475 // JVMSpec| u2 index;
476 // JVMSpec| } local_variable_table[local_variable_table_length];
477 // JVMSpec| }
478 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(const methodHandle& method, u2 num_entries) {
479 write_attribute_name_index("LocalVariableTable");
480 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
481 write_u2(num_entries);
482
483 assert(method->localvariable_table_length() == num_entries, "just checking");
484
485 LocalVariableTableElement *elem = method->localvariable_table_start();
486 for (int j=0; j<method->localvariable_table_length(); j++) {
487 write_u2(elem->start_bci);
488 write_u2(elem->length);
489 write_u2(elem->name_cp_index);
490 write_u2(elem->descriptor_cp_index);
491 write_u2(elem->slot);
492 elem++;
493 }
494 }
495
496 // Write LocalVariableTypeTable attribute
497 // JVMSpec| LocalVariableTypeTable_attribute {
498 // JVMSpec| u2 attribute_name_index;
499 // JVMSpec| u4 attribute_length;
500 // JVMSpec| u2 local_variable_type_table_length;
501 // JVMSpec| { u2 start_pc;
502 // JVMSpec| u2 length;
503 // JVMSpec| u2 name_index;
504 // JVMSpec| u2 signature_index;
505 // JVMSpec| u2 index;
506 // JVMSpec| } local_variable_type_table[local_variable_type_table_length];
507 // JVMSpec| }
508 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries) {
509 write_attribute_name_index("LocalVariableTypeTable");
510 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
511 write_u2(num_entries);
512
513 LocalVariableTableElement *elem = method->localvariable_table_start();
514 for (int j=0; j<method->localvariable_table_length(); j++) {
515 if (elem->signature_cp_index > 0) {
516 // Local variable has a generic signature - write LVTT attribute entry
517 write_u2(elem->start_bci);
518 write_u2(elem->length);
519 write_u2(elem->name_cp_index);
520 write_u2(elem->signature_cp_index);
521 write_u2(elem->slot);
522 num_entries--;
523 }
524 elem++;
525 }
526 assert(num_entries == 0, "just checking");
527 }
528
529 // Write stack map table attribute
530 // JSR-202| StackMapTable_attribute {
531 // JSR-202| u2 attribute_name_index;
532 // JSR-202| u4 attribute_length;
533 // JSR-202| u2 number_of_entries;
534 // JSR-202| stack_map_frame_entries[number_of_entries];
535 // JSR-202| }
536 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(const methodHandle& method,
537 int stackmap_len) {
538
539 write_attribute_name_index("StackMapTable");
540 write_u4(stackmap_len);
541 memcpy(
542 writeable_address(stackmap_len),
543 (void*)(method->stackmap_data()->adr_at(0)),
544 stackmap_len);
545 }
546
547 // Write one method_info structure
548 // JVMSpec| method_info {
549 // JVMSpec| u2 access_flags;
550 // JVMSpec| u2 name_index;
551 // JVMSpec| u2 descriptor_index;
552 // JVMSpec| u2 attributes_count;
553 // JVMSpec| attribute_info attributes[attributes_count];
554 // JVMSpec| }
555 void JvmtiClassFileReconstituter::write_method_info(const methodHandle& method) {
556 AccessFlags access_flags = method->access_flags();
557 ConstMethod* const_method = method->constMethod();
558 u2 generic_signature_index = const_method->generic_signature_index();
559 AnnotationArray* anno = method->annotations();
560 AnnotationArray* param_anno = method->parameter_annotations();
561 AnnotationArray* default_anno = method->annotation_default();
562 AnnotationArray* type_anno = method->type_annotations();
563
564 // skip generated default interface methods
565 if (method->is_overpass()) {
566 return;
567 }
568
569 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
570 write_u2(const_method->name_index());
571 write_u2(const_method->signature_index());
572
573 // write attributes in the same order javac does, so we can test with byte for
574 // byte comparison
575 int attr_count = 0;
576 if (const_method->code_size() != 0) {
577 ++attr_count; // has Code attribute
578 }
579 if (const_method->has_checked_exceptions()) {
580 ++attr_count; // has Exceptions attribute
581 }
582 if (default_anno != NULL) {
583 ++attr_count; // has AnnotationDefault attribute
584 }
585 // Deprecated attribute would go here
586 if (access_flags.is_synthetic()) { // FIXME
587 // ++attr_count;
588 }
589 if (generic_signature_index != 0) {
590 ++attr_count;
591 }
592 if (anno != NULL) {
593 ++attr_count; // has RuntimeVisibleAnnotations attribute
594 }
595 if (param_anno != NULL) {
596 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
597 }
598 if (type_anno != NULL) {
599 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
600 }
601
602 write_u2(attr_count);
603 if (const_method->code_size() > 0) {
604 write_code_attribute(method);
605 }
606 if (const_method->has_checked_exceptions()) {
607 write_exceptions_attribute(const_method);
608 }
609 if (default_anno != NULL) {
610 write_annotations_attribute("AnnotationDefault", default_anno);
611 }
612 // Deprecated attribute would go here
613 if (access_flags.is_synthetic()) {
614 // write_synthetic_attribute();
615 }
616 if (generic_signature_index != 0) {
617 write_signature_attribute(generic_signature_index);
618 }
619 if (anno != NULL) {
620 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
621 }
622 if (param_anno != NULL) {
623 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
624 }
625 if (type_anno != NULL) {
626 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
627 }
628 }
629
630 // Write the class attributes portion of ClassFile structure
631 // JVMSpec| u2 attributes_count;
632 // JVMSpec| attribute_info attributes[attributes_count];
633 void JvmtiClassFileReconstituter::write_class_attributes() {
634 u2 inner_classes_length = inner_classes_attribute_length();
635 Symbol* generic_signature = ik()->generic_signature();
636 AnnotationArray* anno = ik()->class_annotations();
637 AnnotationArray* type_anno = ik()->class_type_annotations();
638
639 int attr_count = 0;
640 if (generic_signature != NULL) {
641 ++attr_count;
642 }
643 if (ik()->source_file_name() != NULL) {
644 ++attr_count;
645 }
646 if (ik()->source_debug_extension() != NULL) {
647 ++attr_count;
648 }
649 if (inner_classes_length > 0) {
650 ++attr_count;
651 }
652 if (anno != NULL) {
653 ++attr_count; // has RuntimeVisibleAnnotations attribute
654 }
655 if (type_anno != NULL) {
656 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
657 }
658 if (cpool()->operands() != NULL) {
659 ++attr_count;
660 }
661
662 write_u2(attr_count);
663
664 if (generic_signature != NULL) {
665 write_signature_attribute(symbol_to_cpool_index(generic_signature));
666 }
667 if (ik()->source_file_name() != NULL) {
668 write_source_file_attribute();
669 }
670 if (ik()->source_debug_extension() != NULL) {
671 write_source_debug_extension_attribute();
672 }
673 if (inner_classes_length > 0) {
674 write_inner_classes_attribute(inner_classes_length);
675 }
676 if (anno != NULL) {
677 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
678 }
679 if (type_anno != NULL) {
680 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
681 }
682 if (cpool()->operands() != NULL) {
683 write_bootstrapmethod_attribute();
684 }
685 }
686
687 // Write the method information portion of ClassFile structure
688 // JVMSpec| u2 methods_count;
689 // JVMSpec| method_info methods[methods_count];
690 void JvmtiClassFileReconstituter::write_method_infos() {
691 HandleMark hm(thread());
692 Array<Method*>* methods = ik()->methods();
693 int num_methods = methods->length();
694 int num_overpass = 0;
695
696 // count the generated default interface methods
697 // these will not be re-created by write_method_info
698 // and should not be included in the total count
699 for (int index = 0; index < num_methods; index++) {
700 Method* method = methods->at(index);
701 if (method->is_overpass()) {
702 num_overpass++;
703 }
704 }
705
706 write_u2(num_methods - num_overpass);
707 if (JvmtiExport::can_maintain_original_method_order()) {
708 int index;
709 int original_index;
710 intArray method_order(num_methods, num_methods, 0);
711
712 // invert the method order mapping
713 for (index = 0; index < num_methods; index++) {
714 original_index = ik()->method_ordering()->at(index);
715 assert(original_index >= 0 && original_index < num_methods,
716 "invalid original method index");
717 method_order.at_put(original_index, index);
718 }
719
720 // write in original order
721 for (original_index = 0; original_index < num_methods; original_index++) {
722 index = method_order.at(original_index);
723 methodHandle method(thread(), methods->at(index));
724 write_method_info(method);
725 }
726 } else {
727 // method order not preserved just dump the method infos
728 for (int index = 0; index < num_methods; index++) {
729 methodHandle method(thread(), methods->at(index));
730 write_method_info(method);
731 }
732 }
733 }
734
735 void JvmtiClassFileReconstituter::write_class_file_format() {
736 ReallocMark();
737
738 // JVMSpec| ClassFile {
739 // JVMSpec| u4 magic;
740 write_u4(0xCAFEBABE);
741
742 // JVMSpec| u2 minor_version;
743 // JVMSpec| u2 major_version;
744 write_u2(ik()->minor_version());
745 u2 major = ik()->major_version();
746 write_u2(major);
747
748 // JVMSpec| u2 constant_pool_count;
749 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
750 write_u2(cpool()->length());
751 copy_cpool_bytes(writeable_address(cpool_size()));
752
753 // JVMSpec| u2 access_flags;
754 write_u2(ik()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
755
756 // JVMSpec| u2 this_class;
757 // JVMSpec| u2 super_class;
758 write_u2(class_symbol_to_cpool_index(ik()->name()));
759 Klass* super_class = ik()->super();
760 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
761 class_symbol_to_cpool_index(super_class->name()));
762
763 // JVMSpec| u2 interfaces_count;
764 // JVMSpec| u2 interfaces[interfaces_count];
765 Array<Klass*>* interfaces = ik()->local_interfaces();
766 int num_interfaces = interfaces->length();
767 write_u2(num_interfaces);
768 for (int index = 0; index < num_interfaces; index++) {
769 HandleMark hm(thread());
770 InstanceKlass* iik = InstanceKlass::cast(interfaces->at(index));
771 write_u2(class_symbol_to_cpool_index(iik->name()));
772 }
773
774 // JVMSpec| u2 fields_count;
775 // JVMSpec| field_info fields[fields_count];
776 write_field_infos();
777
778 // JVMSpec| u2 methods_count;
779 // JVMSpec| method_info methods[methods_count];
780 write_method_infos();
781
782 // JVMSpec| u2 attributes_count;
783 // JVMSpec| attribute_info attributes[attributes_count];
784 // JVMSpec| } /* end ClassFile 8?
785 write_class_attributes();
786 }
787
788 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
789 size_t used_size = _buffer_ptr - _buffer;
790 if (size + used_size >= _buffer_size) {
791 // compute the new buffer size: must be at least twice as big as before
792 // plus whatever new is being used; then convert to nice clean block boundary
793 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
794 * initial_buffer_size;
795
796 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
797 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
798 _buffer_size = new_buffer_size;
799 _buffer_ptr = _buffer + used_size;
800 }
801 u1* ret_ptr = _buffer_ptr;
802 _buffer_ptr += size;
803 return ret_ptr;
804 }
805
806 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
807 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
808 assert(sym != NULL, "attribute name symbol not found");
809 u2 attr_name_index = symbol_to_cpool_index(sym);
810 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
811 write_u2(attr_name_index);
812 }
813
814 void JvmtiClassFileReconstituter::write_u1(u1 x) {
815 *writeable_address(1) = x;
816 }
817
818 void JvmtiClassFileReconstituter::write_u2(u2 x) {
819 Bytes::put_Java_u2(writeable_address(2), x);
820 }
821
822 void JvmtiClassFileReconstituter::write_u4(u4 x) {
823 Bytes::put_Java_u4(writeable_address(4), x);
824 }
825
826 void JvmtiClassFileReconstituter::write_u8(u8 x) {
827 Bytes::put_Java_u8(writeable_address(8), x);
828 }
829
830 void JvmtiClassFileReconstituter::copy_bytecodes(const methodHandle& mh,
831 unsigned char* bytecodes) {
832 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
833 // and the breakpoint bytecode are converted to their original bytecodes.
834
835 BytecodeStream bs(mh);
836
837 unsigned char* p = bytecodes;
838 Bytecodes::Code code;
839 bool is_rewritten = mh->method_holder()->is_rewritten();
840
841 while ((code = bs.next()) >= 0) {
842 assert(Bytecodes::is_java_code(code), "sanity check");
843 assert(code != Bytecodes::_breakpoint, "sanity check");
844
845 // length of bytecode (mnemonic + operands)
846 address bcp = bs.bcp();
847 int len = bs.instruction_size();
848 assert(len > 0, "length must be > 0");
849
850 // copy the bytecodes
851 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
852 if (len > 1) {
853 memcpy(p+1, bcp+1, len-1);
854 }
855
856 // During linking the get/put and invoke instructions are rewritten
857 // with an index into the constant pool cache. The original constant
858 // pool index must be returned to caller. Rewrite the index.
859 if (is_rewritten && len > 1) {
860 bool is_wide = false;
861 switch (code) {
862 case Bytecodes::_getstatic : // fall through
863 case Bytecodes::_putstatic : // fall through
864 case Bytecodes::_getfield : // fall through
865 case Bytecodes::_putfield : // fall through
866 case Bytecodes::_invokevirtual : // fall through
867 case Bytecodes::_invokespecial : // fall through
868 case Bytecodes::_invokestatic : // fall through
869 case Bytecodes::_invokedynamic : // fall through
870 case Bytecodes::_invokeinterface : {
871 assert(len == 3 ||
872 (code == Bytecodes::_invokeinterface && len == 5) ||
873 (code == Bytecodes::_invokedynamic && len == 5),
874 "sanity check");
875
876 int cpci = Bytes::get_native_u2(bcp+1);
877 bool is_invokedynamic = (code == Bytecodes::_invokedynamic);
878 ConstantPoolCacheEntry* entry;
879 if (is_invokedynamic) {
880 cpci = Bytes::get_native_u4(bcp+1);
881 entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
882 } else {
883 // cache cannot be pre-fetched since some classes won't have it yet
884 entry = mh->constants()->cache()->entry_at(cpci);
885 }
886 int i = entry->constant_pool_index();
887 assert(i < mh->constants()->length(), "sanity check");
888 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
889 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
890 break;
891 }
892 case Bytecodes::_ldc_w:
893 is_wide = true; // fall through
894 case Bytecodes::_ldc: {
895 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
896 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
897 int i = mh->constants()->object_to_cp_index(cpci);
898 assert(i < mh->constants()->length(), "sanity check");
899 if (is_wide) {
900 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
901 } else {
902 *(p+1) = (u1)i;
903 }
904 }
905 break;
906 }
907 default:
908 break;
909 }
910 }
911
912 p += len;
913 }
914 }