1 /*
2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "interpreter/bytecodeStream.hpp"
28 #include "oops/fieldStreams.hpp"
29 #include "prims/jvmtiClassFileReconstituter.hpp"
30 #include "runtime/signature.hpp"
31 #ifdef TARGET_ARCH_x86
32 # include "bytes_x86.hpp"
33 #endif
34 #ifdef TARGET_ARCH_aarch64
35 # include "bytes_aarch64.hpp"
36 #endif
37 #ifdef TARGET_ARCH_sparc
38 # include "bytes_sparc.hpp"
39 #endif
40 #ifdef TARGET_ARCH_zero
41 # include "bytes_zero.hpp"
42 #endif
43 #ifdef TARGET_ARCH_arm
44 # include "bytes_arm.hpp"
45 #endif
46 #ifdef TARGET_ARCH_ppc
47 # include "bytes_ppc.hpp"
48 #endif
49 // FIXME: add Deprecated attribute
50 // FIXME: fix Synthetic attribute
51 // FIXME: per Serguei, add error return handling for ConstantPool::copy_cpool_bytes()
52
53
54 // Write the field information portion of ClassFile structure
55 // JVMSpec| u2 fields_count;
56 // JVMSpec| field_info fields[fields_count];
57 void JvmtiClassFileReconstituter::write_field_infos() {
58 HandleMark hm(thread());
59 Array<AnnotationArray*>* fields_anno = ikh()->fields_annotations();
60 Array<AnnotationArray*>* fields_type_anno = ikh()->fields_type_annotations();
61
62 // Compute the real number of Java fields
63 int java_fields = ikh()->java_fields_count();
64
65 write_u2(java_fields);
66 for (JavaFieldStream fs(ikh()); !fs.done(); fs.next()) {
67 AccessFlags access_flags = fs.access_flags();
68 int name_index = fs.name_index();
69 int signature_index = fs.signature_index();
70 int initial_value_index = fs.initval_index();
71 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
72 // int offset = ikh()->field_offset( index );
73 int generic_signature_index = fs.generic_signature_index();
74 AnnotationArray* anno = fields_anno == NULL ? NULL : fields_anno->at(fs.index());
75 AnnotationArray* type_anno = fields_type_anno == NULL ? NULL : fields_type_anno->at(fs.index());
76
77 // JVMSpec| field_info {
78 // JVMSpec| u2 access_flags;
79 // JVMSpec| u2 name_index;
80 // JVMSpec| u2 descriptor_index;
81 // JVMSpec| u2 attributes_count;
82 // JVMSpec| attribute_info attributes[attributes_count];
83 // JVMSpec| }
84
85 write_u2(access_flags.as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
86 write_u2(name_index);
87 write_u2(signature_index);
88 int attr_count = 0;
89 if (initial_value_index != 0) {
90 ++attr_count;
91 }
92 if (access_flags.is_synthetic()) {
93 // ++attr_count;
94 }
95 if (generic_signature_index != 0) {
96 ++attr_count;
97 }
98 if (anno != NULL) {
99 ++attr_count; // has RuntimeVisibleAnnotations attribute
100 }
101 if (type_anno != NULL) {
102 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
103 }
104
105 write_u2(attr_count);
106
107 if (initial_value_index != 0) {
108 write_attribute_name_index("ConstantValue");
109 write_u4(2); //length always 2
110 write_u2(initial_value_index);
111 }
112 if (access_flags.is_synthetic()) {
113 // write_synthetic_attribute();
114 }
115 if (generic_signature_index != 0) {
116 write_signature_attribute(generic_signature_index);
117 }
118 if (anno != NULL) {
119 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
120 }
121 if (type_anno != NULL) {
122 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
123 }
124 }
125 }
126
127 // Write Code attribute
128 // JVMSpec| Code_attribute {
129 // JVMSpec| u2 attribute_name_index;
130 // JVMSpec| u4 attribute_length;
131 // JVMSpec| u2 max_stack;
132 // JVMSpec| u2 max_locals;
133 // JVMSpec| u4 code_length;
134 // JVMSpec| u1 code[code_length];
135 // JVMSpec| u2 exception_table_length;
136 // JVMSpec| { u2 start_pc;
137 // JVMSpec| u2 end_pc;
138 // JVMSpec| u2 handler_pc;
139 // JVMSpec| u2 catch_type;
140 // JVMSpec| } exception_table[exception_table_length];
141 // JVMSpec| u2 attributes_count;
142 // JVMSpec| attribute_info attributes[attributes_count];
143 // JVMSpec| }
144 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {
145 ConstMethod* const_method = method->constMethod();
146 u2 line_num_cnt = 0;
147 int stackmap_len = 0;
148 int local_variable_table_length = 0;
149 int local_variable_type_table_length = 0;
150
151 // compute number and length of attributes
152 int attr_count = 0;
153 int attr_size = 0;
154 if (const_method->has_linenumber_table()) {
155 line_num_cnt = line_number_table_entries(method);
156 if (line_num_cnt != 0) {
157 ++attr_count;
158 // Compute the complete size of the line number table attribute:
159 // LineNumberTable_attribute {
160 // u2 attribute_name_index;
161 // u4 attribute_length;
162 // u2 line_number_table_length;
163 // { u2 start_pc;
164 // u2 line_number;
165 // } line_number_table[line_number_table_length];
166 // }
167 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
168 }
169 }
170 if (method->has_stackmap_table()) {
171 stackmap_len = method->stackmap_data()->length();
172 if (stackmap_len != 0) {
173 ++attr_count;
174 // Compute the size of the stack map table attribute (VM stores raw):
175 // StackMapTable_attribute {
176 // u2 attribute_name_index;
177 // u4 attribute_length;
178 // u2 number_of_entries;
179 // stack_map_frame_entries[number_of_entries];
180 // }
181 attr_size += 2 + 4 + stackmap_len;
182 }
183 }
184 if (method->has_localvariable_table()) {
185 local_variable_table_length = method->localvariable_table_length();
186 if (local_variable_table_length != 0) {
187 ++attr_count;
188 // Compute the size of the local variable table attribute (VM stores raw):
189 // LocalVariableTable_attribute {
190 // u2 attribute_name_index;
191 // u4 attribute_length;
192 // u2 local_variable_table_length;
193 // {
194 // u2 start_pc;
195 // u2 length;
196 // u2 name_index;
197 // u2 descriptor_index;
198 // u2 index;
199 // }
200 attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2);
201
202 // Local variables with generic signatures must have LVTT entries
203 LocalVariableTableElement *elem = method->localvariable_table_start();
204 for (int idx = 0; idx < local_variable_table_length; idx++) {
205 if (elem[idx].signature_cp_index != 0) {
206 local_variable_type_table_length++;
207 }
208 }
209
210 if (local_variable_type_table_length != 0) {
211 ++attr_count;
212 // Compute the size of the local variable type table attribute (VM stores raw):
213 // LocalVariableTypeTable_attribute {
214 // u2 attribute_name_index;
215 // u4 attribute_length;
216 // u2 local_variable_type_table_length;
217 // {
218 // u2 start_pc;
219 // u2 length;
220 // u2 name_index;
221 // u2 signature_index;
222 // u2 index;
223 // }
224 attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2);
225 }
226 }
227 }
228
229 ExceptionTable exception_table(method());
230 int exception_table_length = exception_table.length();
231 int code_size = const_method->code_size();
232 int size =
233 2+2+4 + // max_stack, max_locals, code_length
234 code_size + // code
235 2 + // exception_table_length
236 (2+2+2+2) * exception_table_length + // exception_table
237 2 + // attributes_count
238 attr_size; // attributes
239
240 write_attribute_name_index("Code");
241 write_u4(size);
242 write_u2(method->verifier_max_stack());
243 write_u2(method->max_locals());
244 write_u4(code_size);
245 copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
246 write_u2(exception_table_length);
247 for (int index = 0; index < exception_table_length; index++) {
248 write_u2(exception_table.start_pc(index));
249 write_u2(exception_table.end_pc(index));
250 write_u2(exception_table.handler_pc(index));
251 write_u2(exception_table.catch_type_index(index));
252 }
253 write_u2(attr_count);
254 if (line_num_cnt != 0) {
255 write_line_number_table_attribute(method, line_num_cnt);
256 }
257 if (stackmap_len != 0) {
258 write_stackmap_table_attribute(method, stackmap_len);
259 }
260 if (local_variable_table_length != 0) {
261 write_local_variable_table_attribute(method, local_variable_table_length);
262 }
263 if (local_variable_type_table_length != 0) {
264 write_local_variable_type_table_attribute(method, local_variable_type_table_length);
265 }
266 }
267
268 // Write Exceptions attribute
269 // JVMSpec| Exceptions_attribute {
270 // JVMSpec| u2 attribute_name_index;
271 // JVMSpec| u4 attribute_length;
272 // JVMSpec| u2 number_of_exceptions;
273 // JVMSpec| u2 exception_index_table[number_of_exceptions];
274 // JVMSpec| }
275 void JvmtiClassFileReconstituter::write_exceptions_attribute(ConstMethod* const_method) {
276 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
277 int checked_exceptions_length = const_method->checked_exceptions_length();
278 int size =
279 2 + // number_of_exceptions
280 2 * checked_exceptions_length; // exception_index_table
281
282 write_attribute_name_index("Exceptions");
283 write_u4(size);
284 write_u2(checked_exceptions_length);
285 for (int index = 0; index < checked_exceptions_length; index++) {
286 write_u2(checked_exceptions[index].class_cp_index);
287 }
288 }
289
290 // Write SourceFile attribute
291 // JVMSpec| SourceFile_attribute {
292 // JVMSpec| u2 attribute_name_index;
293 // JVMSpec| u4 attribute_length;
294 // JVMSpec| u2 sourcefile_index;
295 // JVMSpec| }
296 void JvmtiClassFileReconstituter::write_source_file_attribute() {
297 assert(ikh()->source_file_name() != NULL, "caller must check");
298
299 write_attribute_name_index("SourceFile");
300 write_u4(2); // always length 2
301 write_u2(symbol_to_cpool_index(ikh()->source_file_name()));
302 }
303
304 // Write SourceDebugExtension attribute
305 // JSR45| SourceDebugExtension_attribute {
306 // JSR45| u2 attribute_name_index;
307 // JSR45| u4 attribute_length;
308 // JSR45| u1 debug_extension[attribute_length];
309 // JSR45| }
310 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
311 assert(ikh()->source_debug_extension() != NULL, "caller must check");
312
313 write_attribute_name_index("SourceDebugExtension");
314 int len = (int)strlen(ikh()->source_debug_extension());
315 write_u4(len);
316 u1* ext = (u1*)ikh()->source_debug_extension();
317 for (int i=0; i<len; i++) {
318 write_u1(ext[i]);
319 }
320 }
321
322 // Write (generic) Signature attribute
323 // JVMSpec| Signature_attribute {
324 // JVMSpec| u2 attribute_name_index;
325 // JVMSpec| u4 attribute_length;
326 // JVMSpec| u2 signature_index;
327 // JVMSpec| }
328 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
329 write_attribute_name_index("Signature");
330 write_u4(2); // always length 2
331 write_u2(generic_signature_index);
332 }
333
334 // Compute the number of entries in the InnerClasses attribute
335 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
336 InnerClassesIterator iter(ikh());
337 return iter.length();
338 }
339
340 // Write an annotation attribute. The VM stores them in raw form, so all we need
341 // to do is add the attrubute name and fill in the length.
342 // JSR202| *Annotations_attribute {
343 // JSR202| u2 attribute_name_index;
344 // JSR202| u4 attribute_length;
345 // JSR202| ...
346 // JSR202| }
347 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
348 AnnotationArray* annos) {
349 u4 length = annos->length();
350 write_attribute_name_index(attr_name);
351 write_u4(length);
352 memcpy(writeable_address(length), annos->adr_at(0), length);
353 }
354
355 // BootstrapMethods_attribute {
356 // u2 attribute_name_index;
357 // u4 attribute_length;
358 // u2 num_bootstrap_methods;
359 // { u2 bootstrap_method_ref;
360 // u2 num_bootstrap_arguments;
361 // u2 bootstrap_arguments[num_bootstrap_arguments];
362 // } bootstrap_methods[num_bootstrap_methods];
363 // }
364 void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {
365 Array<u2>* operands = cpool()->operands();
366 write_attribute_name_index("BootstrapMethods");
367 int num_bootstrap_methods = ConstantPool::operand_array_length(operands);
368
369 // calculate length of attribute
370 int length = sizeof(u2); // num_bootstrap_methods
371 for (int n = 0; n < num_bootstrap_methods; n++) {
372 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
373 length += sizeof(u2); // bootstrap_method_ref
374 length += sizeof(u2); // num_bootstrap_arguments
375 length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments]
376 }
377 write_u4(length);
378
379 // write attribute
380 write_u2(num_bootstrap_methods);
381 for (int n = 0; n < num_bootstrap_methods; n++) {
382 u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n);
383 u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
384 write_u2(bootstrap_method_ref);
385 write_u2(num_bootstrap_arguments);
386 for (int arg = 0; arg < num_bootstrap_arguments; arg++) {
387 u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg);
388 write_u2(bootstrap_argument);
389 }
390 }
391 }
392
393
394 // Write InnerClasses attribute
395 // JVMSpec| InnerClasses_attribute {
396 // JVMSpec| u2 attribute_name_index;
397 // JVMSpec| u4 attribute_length;
398 // JVMSpec| u2 number_of_classes;
399 // JVMSpec| { u2 inner_class_info_index;
400 // JVMSpec| u2 outer_class_info_index;
401 // JVMSpec| u2 inner_name_index;
402 // JVMSpec| u2 inner_class_access_flags;
403 // JVMSpec| } classes[number_of_classes];
404 // JVMSpec| }
405 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
406 InnerClassesIterator iter(ikh());
407 guarantee(iter.length() != 0 && iter.length() == length,
408 "caller must check");
409 u2 entry_count = length / InstanceKlass::inner_class_next_offset;
410 u4 size = 2 + entry_count * (2+2+2+2);
411
412 write_attribute_name_index("InnerClasses");
413 write_u4(size);
414 write_u2(entry_count);
415 for (; !iter.done(); iter.next()) {
416 write_u2(iter.inner_class_info_index());
417 write_u2(iter.outer_class_info_index());
418 write_u2(iter.inner_name_index());
419 write_u2(iter.inner_access_flags());
420 }
421 }
422
423 // Write Synthetic attribute
424 // JVMSpec| Synthetic_attribute {
425 // JVMSpec| u2 attribute_name_index;
426 // JVMSpec| u4 attribute_length;
427 // JVMSpec| }
428 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
429 write_attribute_name_index("Synthetic");
430 write_u4(0); //length always zero
431 }
432
433 // Compute size of LineNumberTable
434 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
435 // The line number table is compressed so we don't know how big it is until decompressed.
436 // Decompression is really fast so we just do it twice.
437 u2 num_entries = 0;
438 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
439 while (stream.read_pair()) {
440 num_entries++;
441 }
442 return num_entries;
443 }
444
445 // Write LineNumberTable attribute
446 // JVMSpec| LineNumberTable_attribute {
447 // JVMSpec| u2 attribute_name_index;
448 // JVMSpec| u4 attribute_length;
449 // JVMSpec| u2 line_number_table_length;
450 // JVMSpec| { u2 start_pc;
451 // JVMSpec| u2 line_number;
452 // JVMSpec| } line_number_table[line_number_table_length];
453 // JVMSpec| }
454 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
455 u2 num_entries) {
456
457 write_attribute_name_index("LineNumberTable");
458 write_u4(2 + num_entries * (2 + 2));
459 write_u2(num_entries);
460
461 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
462 while (stream.read_pair()) {
463 write_u2(stream.bci());
464 write_u2(stream.line());
465 }
466 }
467
468 // Write LocalVariableTable attribute
469 // JVMSpec| LocalVariableTable_attribute {
470 // JVMSpec| u2 attribute_name_index;
471 // JVMSpec| u4 attribute_length;
472 // JVMSpec| u2 local_variable_table_length;
473 // JVMSpec| { u2 start_pc;
474 // JVMSpec| u2 length;
475 // JVMSpec| u2 name_index;
476 // JVMSpec| u2 descriptor_index;
477 // JVMSpec| u2 index;
478 // JVMSpec| } local_variable_table[local_variable_table_length];
479 // JVMSpec| }
480 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) {
481 write_attribute_name_index("LocalVariableTable");
482 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
483 write_u2(num_entries);
484
485 assert(method->localvariable_table_length() == num_entries, "just checking");
486
487 LocalVariableTableElement *elem = method->localvariable_table_start();
488 for (int j=0; j<method->localvariable_table_length(); j++) {
489 write_u2(elem->start_bci);
490 write_u2(elem->length);
491 write_u2(elem->name_cp_index);
492 write_u2(elem->descriptor_cp_index);
493 write_u2(elem->slot);
494 elem++;
495 }
496 }
497
498 // Write LocalVariableTypeTable attribute
499 // JVMSpec| LocalVariableTypeTable_attribute {
500 // JVMSpec| u2 attribute_name_index;
501 // JVMSpec| u4 attribute_length;
502 // JVMSpec| u2 local_variable_type_table_length;
503 // JVMSpec| { u2 start_pc;
504 // JVMSpec| u2 length;
505 // JVMSpec| u2 name_index;
506 // JVMSpec| u2 signature_index;
507 // JVMSpec| u2 index;
508 // JVMSpec| } local_variable_type_table[local_variable_type_table_length];
509 // JVMSpec| }
510 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(methodHandle method, u2 num_entries) {
511 write_attribute_name_index("LocalVariableTypeTable");
512 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
513 write_u2(num_entries);
514
515 LocalVariableTableElement *elem = method->localvariable_table_start();
516 for (int j=0; j<method->localvariable_table_length(); j++) {
517 if (elem->signature_cp_index > 0) {
518 // Local variable has a generic signature - write LVTT attribute entry
519 write_u2(elem->start_bci);
520 write_u2(elem->length);
521 write_u2(elem->name_cp_index);
522 write_u2(elem->signature_cp_index);
523 write_u2(elem->slot);
524 num_entries--;
525 }
526 elem++;
527 }
528 assert(num_entries == 0, "just checking");
529 }
530
531 // Write stack map table attribute
532 // JSR-202| StackMapTable_attribute {
533 // JSR-202| u2 attribute_name_index;
534 // JSR-202| u4 attribute_length;
535 // JSR-202| u2 number_of_entries;
536 // JSR-202| stack_map_frame_entries[number_of_entries];
537 // JSR-202| }
538 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
539 int stackmap_len) {
540
541 write_attribute_name_index("StackMapTable");
542 write_u4(stackmap_len);
543 memcpy(
544 writeable_address(stackmap_len),
545 (void*)(method->stackmap_data()->adr_at(0)),
546 stackmap_len);
547 }
548
549 // Write one method_info structure
550 // JVMSpec| method_info {
551 // JVMSpec| u2 access_flags;
552 // JVMSpec| u2 name_index;
553 // JVMSpec| u2 descriptor_index;
554 // JVMSpec| u2 attributes_count;
555 // JVMSpec| attribute_info attributes[attributes_count];
556 // JVMSpec| }
557 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
558 AccessFlags access_flags = method->access_flags();
559 ConstMethod* const_method = method->constMethod();
560 u2 generic_signature_index = const_method->generic_signature_index();
561 AnnotationArray* anno = method->annotations();
562 AnnotationArray* param_anno = method->parameter_annotations();
563 AnnotationArray* default_anno = method->annotation_default();
564 AnnotationArray* type_anno = method->type_annotations();
565
566 // skip generated default interface methods
567 if (method->is_overpass()) {
568 return;
569 }
570
571 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
572 write_u2(const_method->name_index());
573 write_u2(const_method->signature_index());
574
575 // write attributes in the same order javac does, so we can test with byte for
576 // byte comparison
577 int attr_count = 0;
578 if (const_method->code_size() != 0) {
579 ++attr_count; // has Code attribute
580 }
581 if (const_method->has_checked_exceptions()) {
582 ++attr_count; // has Exceptions attribute
583 }
584 if (default_anno != NULL) {
585 ++attr_count; // has AnnotationDefault attribute
586 }
587 // Deprecated attribute would go here
588 if (access_flags.is_synthetic()) { // FIXME
589 // ++attr_count;
590 }
591 if (generic_signature_index != 0) {
592 ++attr_count;
593 }
594 if (anno != NULL) {
595 ++attr_count; // has RuntimeVisibleAnnotations attribute
596 }
597 if (param_anno != NULL) {
598 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
599 }
600 if (type_anno != NULL) {
601 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
602 }
603
604 write_u2(attr_count);
605 if (const_method->code_size() > 0) {
606 write_code_attribute(method);
607 }
608 if (const_method->has_checked_exceptions()) {
609 write_exceptions_attribute(const_method);
610 }
611 if (default_anno != NULL) {
612 write_annotations_attribute("AnnotationDefault", default_anno);
613 }
614 // Deprecated attribute would go here
615 if (access_flags.is_synthetic()) {
616 // write_synthetic_attribute();
617 }
618 if (generic_signature_index != 0) {
619 write_signature_attribute(generic_signature_index);
620 }
621 if (anno != NULL) {
622 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
623 }
624 if (param_anno != NULL) {
625 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
626 }
627 if (type_anno != NULL) {
628 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
629 }
630 }
631
632 // Write the class attributes portion of ClassFile structure
633 // JVMSpec| u2 attributes_count;
634 // JVMSpec| attribute_info attributes[attributes_count];
635 void JvmtiClassFileReconstituter::write_class_attributes() {
636 u2 inner_classes_length = inner_classes_attribute_length();
637 Symbol* generic_signature = ikh()->generic_signature();
638 AnnotationArray* anno = ikh()->class_annotations();
639 AnnotationArray* type_anno = ikh()->class_type_annotations();
640
641 int attr_count = 0;
642 if (generic_signature != NULL) {
643 ++attr_count;
644 }
645 if (ikh()->source_file_name() != NULL) {
646 ++attr_count;
647 }
648 if (ikh()->source_debug_extension() != NULL) {
649 ++attr_count;
650 }
651 if (inner_classes_length > 0) {
652 ++attr_count;
653 }
654 if (anno != NULL) {
655 ++attr_count; // has RuntimeVisibleAnnotations attribute
656 }
657 if (type_anno != NULL) {
658 ++attr_count; // has RuntimeVisibleTypeAnnotations attribute
659 }
660 if (cpool()->operands() != NULL) {
661 ++attr_count;
662 }
663
664 write_u2(attr_count);
665
666 if (generic_signature != NULL) {
667 write_signature_attribute(symbol_to_cpool_index(generic_signature));
668 }
669 if (ikh()->source_file_name() != NULL) {
670 write_source_file_attribute();
671 }
672 if (ikh()->source_debug_extension() != NULL) {
673 write_source_debug_extension_attribute();
674 }
675 if (inner_classes_length > 0) {
676 write_inner_classes_attribute(inner_classes_length);
677 }
678 if (anno != NULL) {
679 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
680 }
681 if (type_anno != NULL) {
682 write_annotations_attribute("RuntimeVisibleTypeAnnotations", type_anno);
683 }
684 if (cpool()->operands() != NULL) {
685 write_bootstrapmethod_attribute();
686 }
687 }
688
689 // Write the method information portion of ClassFile structure
690 // JVMSpec| u2 methods_count;
691 // JVMSpec| method_info methods[methods_count];
692 void JvmtiClassFileReconstituter::write_method_infos() {
693 HandleMark hm(thread());
694 Array<Method*>* methods = ikh()->methods();
695 int num_methods = methods->length();
696 int num_overpass = 0;
697
698 // count the generated default interface methods
699 // these will not be re-created by write_method_info
700 // and should not be included in the total count
701 for (int index = 0; index < num_methods; index++) {
702 Method* method = methods->at(index);
703 if (method->is_overpass()) {
704 num_overpass++;
705 }
706 }
707
708 write_u2(num_methods - num_overpass);
709 if (JvmtiExport::can_maintain_original_method_order()) {
710 int index;
711 int original_index;
712 intArray method_order(num_methods, 0);
713
714 // invert the method order mapping
715 for (index = 0; index < num_methods; index++) {
716 original_index = ikh()->method_ordering()->at(index);
717 assert(original_index >= 0 && original_index < num_methods,
718 "invalid original method index");
719 method_order.at_put(original_index, index);
720 }
721
722 // write in original order
723 for (original_index = 0; original_index < num_methods; original_index++) {
724 index = method_order.at(original_index);
725 methodHandle method(thread(), methods->at(index));
726 write_method_info(method);
727 }
728 } else {
729 // method order not preserved just dump the method infos
730 for (int index = 0; index < num_methods; index++) {
731 methodHandle method(thread(), methods->at(index));
732 write_method_info(method);
733 }
734 }
735 }
736
737 void JvmtiClassFileReconstituter::write_class_file_format() {
738 ReallocMark();
739
740 // JVMSpec| ClassFile {
741 // JVMSpec| u4 magic;
742 write_u4(0xCAFEBABE);
743
744 // JVMSpec| u2 minor_version;
745 // JVMSpec| u2 major_version;
746 write_u2(ikh()->minor_version());
747 u2 major = ikh()->major_version();
748 write_u2(major);
749
750 // JVMSpec| u2 constant_pool_count;
751 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
752 write_u2(cpool()->length());
753 copy_cpool_bytes(writeable_address(cpool_size()));
754
755 // JVMSpec| u2 access_flags;
756 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
757
758 // JVMSpec| u2 this_class;
759 // JVMSpec| u2 super_class;
760 write_u2(class_symbol_to_cpool_index(ikh()->name()));
761 Klass* super_class = ikh()->super();
762 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
763 class_symbol_to_cpool_index(super_class->name()));
764
765 // JVMSpec| u2 interfaces_count;
766 // JVMSpec| u2 interfaces[interfaces_count];
767 Array<Klass*>* interfaces = ikh()->local_interfaces();
768 int num_interfaces = interfaces->length();
769 write_u2(num_interfaces);
770 for (int index = 0; index < num_interfaces; index++) {
771 HandleMark hm(thread());
772 instanceKlassHandle iikh(thread(), interfaces->at(index));
773 write_u2(class_symbol_to_cpool_index(iikh->name()));
774 }
775
776 // JVMSpec| u2 fields_count;
777 // JVMSpec| field_info fields[fields_count];
778 write_field_infos();
779
780 // JVMSpec| u2 methods_count;
781 // JVMSpec| method_info methods[methods_count];
782 write_method_infos();
783
784 // JVMSpec| u2 attributes_count;
785 // JVMSpec| attribute_info attributes[attributes_count];
786 // JVMSpec| } /* end ClassFile 8?
787 write_class_attributes();
788 }
789
790 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
791 size_t used_size = _buffer_ptr - _buffer;
792 if (size + used_size >= _buffer_size) {
793 // compute the new buffer size: must be at least twice as big as before
794 // plus whatever new is being used; then convert to nice clean block boundary
795 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
796 * initial_buffer_size;
797
798 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
799 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
800 _buffer_size = new_buffer_size;
801 _buffer_ptr = _buffer + used_size;
802 }
803 u1* ret_ptr = _buffer_ptr;
804 _buffer_ptr += size;
805 return ret_ptr;
806 }
807
808 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
809 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
810 assert(sym != NULL, "attribute name symbol not found");
811 u2 attr_name_index = symbol_to_cpool_index(sym);
812 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
813 write_u2(attr_name_index);
814 }
815
816 void JvmtiClassFileReconstituter::write_u1(u1 x) {
817 *writeable_address(1) = x;
818 }
819
820 void JvmtiClassFileReconstituter::write_u2(u2 x) {
821 Bytes::put_Java_u2(writeable_address(2), x);
822 }
823
824 void JvmtiClassFileReconstituter::write_u4(u4 x) {
825 Bytes::put_Java_u4(writeable_address(4), x);
826 }
827
828 void JvmtiClassFileReconstituter::write_u8(u8 x) {
829 Bytes::put_Java_u8(writeable_address(8), x);
830 }
831
832 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
833 unsigned char* bytecodes) {
834 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
835 // and the breakpoint bytecode are converted to their original bytecodes.
836
837 BytecodeStream bs(mh);
838
839 unsigned char* p = bytecodes;
840 Bytecodes::Code code;
841 bool is_rewritten = mh->method_holder()->is_rewritten();
842
843 while ((code = bs.next()) >= 0) {
844 assert(Bytecodes::is_java_code(code), "sanity check");
845 assert(code != Bytecodes::_breakpoint, "sanity check");
846
847 // length of bytecode (mnemonic + operands)
848 address bcp = bs.bcp();
849 int len = bs.instruction_size();
850 assert(len > 0, "length must be > 0");
851
852 // copy the bytecodes
853 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
854 if (len > 1) {
855 memcpy(p+1, bcp+1, len-1);
856 }
857
858 // During linking the get/put and invoke instructions are rewritten
859 // with an index into the constant pool cache. The original constant
860 // pool index must be returned to caller. Rewrite the index.
861 if (is_rewritten && len > 1) {
862 bool is_wide = false;
863 switch (code) {
864 case Bytecodes::_getstatic : // fall through
865 case Bytecodes::_putstatic : // fall through
866 case Bytecodes::_getfield : // fall through
867 case Bytecodes::_putfield : // fall through
868 case Bytecodes::_invokevirtual : // fall through
869 case Bytecodes::_invokespecial : // fall through
870 case Bytecodes::_invokestatic : // fall through
871 case Bytecodes::_invokedynamic : // fall through
872 case Bytecodes::_invokeinterface : {
873 assert(len == 3 ||
874 (code == Bytecodes::_invokeinterface && len == 5) ||
875 (code == Bytecodes::_invokedynamic && len == 5),
876 "sanity check");
877
878 int cpci = Bytes::get_native_u2(bcp+1);
879 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);
880 ConstantPoolCacheEntry* entry;
881 if (is_invokedynamic) {
882 cpci = Bytes::get_native_u4(bcp+1);
883 entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
884 } else {
885 // cache cannot be pre-fetched since some classes won't have it yet
886 entry = mh->constants()->cache()->entry_at(cpci);
887 }
888 int i = entry->constant_pool_index();
889 assert(i < mh->constants()->length(), "sanity check");
890 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
891 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
892 break;
893 }
894 case Bytecodes::_ldc_w:
895 is_wide = true; // fall through
896 case Bytecodes::_ldc: {
897 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
898 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
899 int i = mh->constants()->object_to_cp_index(cpci);
900 assert(i < mh->constants()->length(), "sanity check");
901 if (is_wide) {
902 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
903 } else {
904 *(p+1) = (u1)i;
905 }
906 }
907 break;
908 }
909 }
910 }
911
912 p += len;
913 }
914 }