1 /*
2 * Copyright (c) 2005, 2018, 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 // NestHost_attribute {
392 // u2 attribute_name_index;
393 // u4 attribute_length;
394 // u2 host_class_index;
395 // }
396 void JvmtiClassFileReconstituter::write_nest_host_attribute() {
397 int length = sizeof(u2);
398 int host_class_index = ik()->nest_host_index();
399
400 write_attribute_name_index("NestHost");
401 write_u4(length);
402 write_u2(host_class_index);
403 }
404
405 // NestMembers_attribute {
406 // u2 attribute_name_index;
407 // u4 attribute_length;
408 // u2 number_of_classes;
409 // u2 classes[number_of_classes];
410 // }
411 void JvmtiClassFileReconstituter::write_nest_members_attribute() {
412 Array<u2>* nest_members = ik()->nest_members();
413 int number_of_classes = nest_members->length();
414 int length = sizeof(u2) * (1 + number_of_classes);
415
416 write_attribute_name_index("NestMembers");
417 write_u4(length);
418 write_u2(number_of_classes);
419 for (int i = 0; i < number_of_classes; i++) {
420 u2 class_cp_index = nest_members->at(i);
421 write_u2(class_cp_index);
422 }
423 }
424
425
426 // Write InnerClasses attribute
427 // JVMSpec| InnerClasses_attribute {
428 // JVMSpec| u2 attribute_name_index;
429 // JVMSpec| u4 attribute_length;
430 // JVMSpec| u2 number_of_classes;
431 // JVMSpec| { u2 inner_class_info_index;
432 // JVMSpec| u2 outer_class_info_index;
433 // JVMSpec| u2 inner_name_index;
434 // JVMSpec| u2 inner_class_access_flags;
435 // JVMSpec| } classes[number_of_classes];
436 // JVMSpec| }
437 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
438 InnerClassesIterator iter(ik());
439 guarantee(iter.length() != 0 && iter.length() == length,
440 "caller must check");
441 u2 entry_count = length / InstanceKlass::inner_class_next_offset;
442 u4 size = 2 + entry_count * (2+2+2+2);
443
444 write_attribute_name_index("InnerClasses");
445 write_u4(size);
446 write_u2(entry_count);
447 for (; !iter.done(); iter.next()) {
448 write_u2(iter.inner_class_info_index());
449 write_u2(iter.outer_class_info_index());
450 write_u2(iter.inner_name_index());
451 write_u2(iter.inner_access_flags());
452 }
453 }
454
455 // Write Synthetic attribute
456 // JVMSpec| Synthetic_attribute {
457 // JVMSpec| u2 attribute_name_index;
458 // JVMSpec| u4 attribute_length;
459 // JVMSpec| }
460 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
461 write_attribute_name_index("Synthetic");
462 write_u4(0); //length always zero
463 }
464
465 // Compute size of LineNumberTable
466 u2 JvmtiClassFileReconstituter::line_number_table_entries(const methodHandle& method) {
467 // The line number table is compressed so we don't know how big it is until decompressed.
468 // Decompression is really fast so we just do it twice.
469 u2 num_entries = 0;
470 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
471 while (stream.read_pair()) {
472 num_entries++;
473 }
474 return num_entries;
475 }
476
477 // Write LineNumberTable attribute
478 // JVMSpec| LineNumberTable_attribute {
479 // JVMSpec| u2 attribute_name_index;
480 // JVMSpec| u4 attribute_length;
481 // JVMSpec| u2 line_number_table_length;
482 // JVMSpec| { u2 start_pc;
483 // JVMSpec| u2 line_number;
484 // JVMSpec| } line_number_table[line_number_table_length];
485 // JVMSpec| }
486 void JvmtiClassFileReconstituter::write_line_number_table_attribute(const methodHandle& method,
487 u2 num_entries) {
488
489 write_attribute_name_index("LineNumberTable");
490 write_u4(2 + num_entries * (2 + 2));
491 write_u2(num_entries);
492
493 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
494 while (stream.read_pair()) {
495 write_u2(stream.bci());
496 write_u2(stream.line());
497 }
498 }
499
500 // Write LocalVariableTable attribute
501 // JVMSpec| LocalVariableTable_attribute {
502 // JVMSpec| u2 attribute_name_index;
503 // JVMSpec| u4 attribute_length;
504 // JVMSpec| u2 local_variable_table_length;
505 // JVMSpec| { u2 start_pc;
506 // JVMSpec| u2 length;
507 // JVMSpec| u2 name_index;
508 // JVMSpec| u2 descriptor_index;
509 // JVMSpec| u2 index;
510 // JVMSpec| } local_variable_table[local_variable_table_length];
511 // JVMSpec| }
512 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(const methodHandle& method, u2 num_entries) {
513 write_attribute_name_index("LocalVariableTable");
514 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
515 write_u2(num_entries);
516
517 assert(method->localvariable_table_length() == num_entries, "just checking");
518
519 LocalVariableTableElement *elem = method->localvariable_table_start();
520 for (int j=0; j<method->localvariable_table_length(); j++) {
521 write_u2(elem->start_bci);
522 write_u2(elem->length);
523 write_u2(elem->name_cp_index);
524 write_u2(elem->descriptor_cp_index);
525 write_u2(elem->slot);
526 elem++;
527 }
528 }
529
530 // Write LocalVariableTypeTable attribute
531 // JVMSpec| LocalVariableTypeTable_attribute {
532 // JVMSpec| u2 attribute_name_index;
533 // JVMSpec| u4 attribute_length;
534 // JVMSpec| u2 local_variable_type_table_length;
535 // JVMSpec| { u2 start_pc;
536 // JVMSpec| u2 length;
537 // JVMSpec| u2 name_index;
538 // JVMSpec| u2 signature_index;
539 // JVMSpec| u2 index;
540 // JVMSpec| } local_variable_type_table[local_variable_type_table_length];
541 // JVMSpec| }
542 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries) {
543 write_attribute_name_index("LocalVariableTypeTable");
544 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
545 write_u2(num_entries);
546
547 LocalVariableTableElement *elem = method->localvariable_table_start();
548 for (int j=0; j<method->localvariable_table_length(); j++) {
549 if (elem->signature_cp_index > 0) {
550 // Local variable has a generic signature - write LVTT attribute entry
551 write_u2(elem->start_bci);
552 write_u2(elem->length);
553 write_u2(elem->name_cp_index);
554 write_u2(elem->signature_cp_index);
555 write_u2(elem->slot);
556 num_entries--;
557 }
558 elem++;
559 }
560 assert(num_entries == 0, "just checking");
561 }
562
563 // Write stack map table attribute
564 // JSR-202| StackMapTable_attribute {
565 // JSR-202| u2 attribute_name_index;
566 // JSR-202| u4 attribute_length;
567 // JSR-202| u2 number_of_entries;
568 // JSR-202| stack_map_frame_entries[number_of_entries];
569 // JSR-202| }
570 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(const methodHandle& method,
571 int stackmap_len) {
572
573 write_attribute_name_index("StackMapTable");
574 write_u4(stackmap_len);
575 memcpy(
576 writeable_address(stackmap_len),
577 (void*)(method->stackmap_data()->adr_at(0)),
578 stackmap_len);
579 }
580
581 // Write one method_info structure
582 // JVMSpec| method_info {
583 // JVMSpec| u2 access_flags;
584 // JVMSpec| u2 name_index;
585 // JVMSpec| u2 descriptor_index;
586 // JVMSpec| u2 attributes_count;
587 // JVMSpec| attribute_info attributes[attributes_count];
588 // JVMSpec| }
589 void JvmtiClassFileReconstituter::write_method_info(const methodHandle& method) {
590 AccessFlags access_flags = method->access_flags();
591 ConstMethod* const_method = method->constMethod();
592 u2 generic_signature_index = const_method->generic_signature_index();
593 AnnotationArray* anno = method->annotations();
594 AnnotationArray* param_anno = method->parameter_annotations();
595 AnnotationArray* default_anno = method->annotation_default();
596 AnnotationArray* type_anno = method->type_annotations();
597
598 // skip generated default interface methods
599 if (method->is_overpass()) {
600 return;
601 }
602
603 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
604 write_u2(const_method->name_index());
605 write_u2(const_method->signature_index());
606
607 // write attributes in the same order javac does, so we can test with byte for
608 // byte comparison
609 int attr_count = 0;
610 if (const_method->code_size() != 0) {
611 ++attr_count; // has Code attribute
612 }
613 if (const_method->has_checked_exceptions()) {
614 ++attr_count; // has Exceptions attribute
615 }
616 if (default_anno != NULL) {
617 ++attr_count; // has AnnotationDefault attribute
618 }
619 // Deprecated attribute would go here
620 if (access_flags.is_synthetic()) { // FIXME
621 // ++attr_count;
622 }
623 if (generic_signature_index != 0) {
624 ++attr_count;
625 }
626 if (anno != NULL) {
627 ++attr_count; // has RuntimeVisibleAnnotations attribute
628 }
629 if (param_anno != NULL) {
630 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
631 }
632 if (type_anno != NULL) {
633 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
634 }
635
636 write_u2(attr_count);
637 if (const_method->code_size() > 0) {
638 write_code_attribute(method);
639 }
640 if (const_method->has_checked_exceptions()) {
641 write_exceptions_attribute(const_method);
642 }
643 if (default_anno != NULL) {
644 write_annotations_attribute("AnnotationDefault", default_anno);
645 }
646 // Deprecated attribute would go here
647 if (access_flags.is_synthetic()) {
648 // write_synthetic_attribute();
649 }
650 if (generic_signature_index != 0) {
651 write_signature_attribute(generic_signature_index);
652 }
653 if (anno != NULL) {
654 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
655 }
656 if (param_anno != NULL) {
657 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
658 }
659 if (type_anno != NULL) {
660 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
661 }
662 }
663
664 // Write the class attributes portion of ClassFile structure
665 // JVMSpec| u2 attributes_count;
666 // JVMSpec| attribute_info attributes[attributes_count];
667 void JvmtiClassFileReconstituter::write_class_attributes() {
668 u2 inner_classes_length = inner_classes_attribute_length();
669 Symbol* generic_signature = ik()->generic_signature();
670 AnnotationArray* anno = ik()->class_annotations();
671 AnnotationArray* type_anno = ik()->class_type_annotations();
672
673 int attr_count = 0;
674 if (generic_signature != NULL) {
675 ++attr_count;
676 }
677 if (ik()->source_file_name() != NULL) {
678 ++attr_count;
679 }
680 if (ik()->source_debug_extension() != NULL) {
681 ++attr_count;
682 }
683 if (inner_classes_length > 0) {
684 ++attr_count;
685 }
686 if (anno != NULL) {
687 ++attr_count; // has RuntimeVisibleAnnotations attribute
688 }
689 if (type_anno != NULL) {
690 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
691 }
692 if (cpool()->operands() != NULL) {
693 ++attr_count;
694 }
695 if (ik()->nest_host_index() != 0) {
696 ++attr_count;
697 }
698 if (ik()->nest_members() != Universe::the_empty_short_array()) {
699 ++attr_count;
700 }
701
702 write_u2(attr_count);
703
704 if (generic_signature != NULL) {
705 write_signature_attribute(symbol_to_cpool_index(generic_signature));
706 }
707 if (ik()->source_file_name() != NULL) {
708 write_source_file_attribute();
709 }
710 if (ik()->source_debug_extension() != NULL) {
711 write_source_debug_extension_attribute();
712 }
713 if (inner_classes_length > 0) {
714 write_inner_classes_attribute(inner_classes_length);
715 }
716 if (anno != NULL) {
717 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
718 }
719 if (type_anno != NULL) {
720 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
721 }
722 if (cpool()->operands() != NULL) {
723 write_bootstrapmethod_attribute();
724 }
725 if (ik()->nest_host_index() != 0) {
726 write_nest_host_attribute();
727 }
728 if (ik()->nest_members() != Universe::the_empty_short_array()) {
729 write_nest_members_attribute();
730 }
731 }
732
733 // Write the method information portion of ClassFile structure
734 // JVMSpec| u2 methods_count;
735 // JVMSpec| method_info methods[methods_count];
736 void JvmtiClassFileReconstituter::write_method_infos() {
737 HandleMark hm(thread());
738 Array<Method*>* methods = ik()->methods();
739 int num_methods = methods->length();
740 int num_overpass = 0;
741
742 // count the generated default interface methods
743 // these will not be re-created by write_method_info
744 // and should not be included in the total count
745 for (int index = 0; index < num_methods; index++) {
746 Method* method = methods->at(index);
747 if (method->is_overpass()) {
748 num_overpass++;
749 }
750 }
751
752 write_u2(num_methods - num_overpass);
753 if (JvmtiExport::can_maintain_original_method_order()) {
754 int index;
755 int original_index;
756 intArray method_order(num_methods, num_methods, 0);
757
758 // invert the method order mapping
759 for (index = 0; index < num_methods; index++) {
760 original_index = ik()->method_ordering()->at(index);
761 assert(original_index >= 0 && original_index < num_methods,
762 "invalid original method index");
763 method_order.at_put(original_index, index);
764 }
765
766 // write in original order
767 for (original_index = 0; original_index < num_methods; original_index++) {
768 index = method_order.at(original_index);
769 methodHandle method(thread(), methods->at(index));
770 write_method_info(method);
771 }
772 } else {
773 // method order not preserved just dump the method infos
774 for (int index = 0; index < num_methods; index++) {
775 methodHandle method(thread(), methods->at(index));
776 write_method_info(method);
777 }
778 }
779 }
780
781 void JvmtiClassFileReconstituter::write_class_file_format() {
782 ReallocMark();
783
784 // JVMSpec| ClassFile {
785 // JVMSpec| u4 magic;
786 write_u4(0xCAFEBABE);
787
788 // JVMSpec| u2 minor_version;
789 // JVMSpec| u2 major_version;
790 write_u2(ik()->minor_version());
791 u2 major = ik()->major_version();
792 write_u2(major);
793
794 // JVMSpec| u2 constant_pool_count;
795 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
796 write_u2(cpool()->length());
797 copy_cpool_bytes(writeable_address(cpool_size()));
798
799 // JVMSpec| u2 access_flags;
800 write_u2(ik()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
801
802 // JVMSpec| u2 this_class;
803 // JVMSpec| u2 super_class;
804 write_u2(class_symbol_to_cpool_index(ik()->name()));
805 Klass* super_class = ik()->super();
806 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
807 class_symbol_to_cpool_index(super_class->name()));
808
809 // JVMSpec| u2 interfaces_count;
810 // JVMSpec| u2 interfaces[interfaces_count];
811 Array<Klass*>* interfaces = ik()->local_interfaces();
812 int num_interfaces = interfaces->length();
813 write_u2(num_interfaces);
814 for (int index = 0; index < num_interfaces; index++) {
815 HandleMark hm(thread());
816 InstanceKlass* iik = InstanceKlass::cast(interfaces->at(index));
817 write_u2(class_symbol_to_cpool_index(iik->name()));
818 }
819
820 // JVMSpec| u2 fields_count;
821 // JVMSpec| field_info fields[fields_count];
822 write_field_infos();
823
824 // JVMSpec| u2 methods_count;
825 // JVMSpec| method_info methods[methods_count];
826 write_method_infos();
827
828 // JVMSpec| u2 attributes_count;
829 // JVMSpec| attribute_info attributes[attributes_count];
830 // JVMSpec| } /* end ClassFile 8?
831 write_class_attributes();
832 }
833
834 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
835 size_t used_size = _buffer_ptr - _buffer;
836 if (size + used_size >= _buffer_size) {
837 // compute the new buffer size: must be at least twice as big as before
838 // plus whatever new is being used; then convert to nice clean block boundary
839 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
840 * initial_buffer_size;
841
842 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
843 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
844 _buffer_size = new_buffer_size;
845 _buffer_ptr = _buffer + used_size;
846 }
847 u1* ret_ptr = _buffer_ptr;
848 _buffer_ptr += size;
849 return ret_ptr;
850 }
851
852 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
853 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
854 assert(sym != NULL, "attribute name symbol not found");
855 u2 attr_name_index = symbol_to_cpool_index(sym);
856 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
857 write_u2(attr_name_index);
858 }
859
860 void JvmtiClassFileReconstituter::write_u1(u1 x) {
861 *writeable_address(1) = x;
862 }
863
864 void JvmtiClassFileReconstituter::write_u2(u2 x) {
865 Bytes::put_Java_u2(writeable_address(2), x);
866 }
867
868 void JvmtiClassFileReconstituter::write_u4(u4 x) {
869 Bytes::put_Java_u4(writeable_address(4), x);
870 }
871
872 void JvmtiClassFileReconstituter::write_u8(u8 x) {
873 Bytes::put_Java_u8(writeable_address(8), x);
874 }
875
876 void JvmtiClassFileReconstituter::copy_bytecodes(const methodHandle& mh,
877 unsigned char* bytecodes) {
878 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
879 // and the breakpoint bytecode are converted to their original bytecodes.
880
881 BytecodeStream bs(mh);
882
883 unsigned char* p = bytecodes;
884 Bytecodes::Code code;
885 bool is_rewritten = mh->method_holder()->is_rewritten();
886
887 while ((code = bs.next()) >= 0) {
888 assert(Bytecodes::is_java_code(code), "sanity check");
889 assert(code != Bytecodes::_breakpoint, "sanity check");
890
891 // length of bytecode (mnemonic + operands)
892 address bcp = bs.bcp();
893 int len = bs.instruction_size();
894 assert(len > 0, "length must be > 0");
895
896 // copy the bytecodes
897 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
898 if (len > 1) {
899 memcpy(p+1, bcp+1, len-1);
900 }
901
902 // During linking the get/put and invoke instructions are rewritten
903 // with an index into the constant pool cache. The original constant
904 // pool index must be returned to caller. Rewrite the index.
905 if (is_rewritten && len > 1) {
906 bool is_wide = false;
907 switch (code) {
908 case Bytecodes::_getstatic : // fall through
909 case Bytecodes::_putstatic : // fall through
910 case Bytecodes::_getfield : // fall through
911 case Bytecodes::_putfield : // fall through
912 case Bytecodes::_invokevirtual : // fall through
913 case Bytecodes::_invokespecial : // fall through
914 case Bytecodes::_invokestatic : // fall through
915 case Bytecodes::_invokedynamic : // fall through
916 case Bytecodes::_invokeinterface : {
917 assert(len == 3 ||
918 (code == Bytecodes::_invokeinterface && len == 5) ||
919 (code == Bytecodes::_invokedynamic && len == 5),
920 "sanity check");
921
922 int cpci = Bytes::get_native_u2(bcp+1);
923 bool is_invokedynamic = (code == Bytecodes::_invokedynamic);
924 ConstantPoolCacheEntry* entry;
925 if (is_invokedynamic) {
926 cpci = Bytes::get_native_u4(bcp+1);
927 entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
928 } else {
929 // cache cannot be pre-fetched since some classes won't have it yet
930 entry = mh->constants()->cache()->entry_at(cpci);
931 }
932 int i = entry->constant_pool_index();
933 assert(i < mh->constants()->length(), "sanity check");
934 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
935 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
936 break;
937 }
938 case Bytecodes::_ldc_w:
939 is_wide = true; // fall through
940 case Bytecodes::_ldc: {
941 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
942 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
943 int i = mh->constants()->object_to_cp_index(cpci);
944 assert(i < mh->constants()->length(), "sanity check");
945 if (is_wide) {
946 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
947 } else {
948 *(p+1) = (u1)i;
949 }
950 }
951 break;
952 }
953 default:
954 break;
955 }
956 }
957
958 p += len;
959 }
960 }