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