1 /*
2 * Copyright (c) 2005, 2011, 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, LVTT attributes
47 // FIXME: fix Synthetic attribute
48 // FIXME: per Serguei, add error return handling for constantPoolOopDesc::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 objArrayHandle fields_anno(thread(), 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 typeArrayHandle anno(thread(), fields_anno.not_null() ?
71 (typeArrayOop)(fields_anno->obj_at(fs.index())) :
72 (typeArrayOop)NULL);
73
74 // JVMSpec| field_info {
75 // JVMSpec| u2 access_flags;
76 // JVMSpec| u2 name_index;
77 // JVMSpec| u2 descriptor_index;
78 // JVMSpec| u2 attributes_count;
79 // JVMSpec| attribute_info attributes[attributes_count];
80 // JVMSpec| }
81
82 write_u2(access_flags.as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
83 write_u2(name_index);
84 write_u2(signature_index);
85 int attr_count = 0;
86 if (initial_value_index != 0) {
87 ++attr_count;
88 }
89 if (access_flags.is_synthetic()) {
90 // ++attr_count;
91 }
92 if (generic_signature_index != 0) {
93 ++attr_count;
94 }
95 if (anno.not_null()) {
96 ++attr_count; // has RuntimeVisibleAnnotations attribute
97 }
98
99 write_u2(attr_count);
100
101 if (initial_value_index != 0) {
102 write_attribute_name_index("ConstantValue");
103 write_u4(2); //length always 2
104 write_u2(initial_value_index);
105 }
106 if (access_flags.is_synthetic()) {
107 // write_synthetic_attribute();
108 }
109 if (generic_signature_index != 0) {
110 write_signature_attribute(generic_signature_index);
111 }
112 if (anno.not_null()) {
113 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
114 }
115 }
116 }
117
118 // Write Code attribute
119 // JVMSpec| Code_attribute {
120 // JVMSpec| u2 attribute_name_index;
121 // JVMSpec| u4 attribute_length;
122 // JVMSpec| u2 max_stack;
123 // JVMSpec| u2 max_locals;
124 // JVMSpec| u4 code_length;
125 // JVMSpec| u1 code[code_length];
126 // JVMSpec| u2 exception_table_length;
127 // JVMSpec| { u2 start_pc;
128 // JVMSpec| u2 end_pc;
129 // JVMSpec| u2 handler_pc;
130 // JVMSpec| u2 catch_type;
131 // JVMSpec| } exception_table[exception_table_length];
132 // JVMSpec| u2 attributes_count;
133 // JVMSpec| attribute_info attributes[attributes_count];
134 // JVMSpec| }
135 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {
136 constMethodHandle const_method(thread(), method->constMethod());
137 u2 line_num_cnt = 0;
138 int stackmap_len = 0;
139 int local_variable_table_length = 0;
140
141 // compute number and length of attributes
142 int attr_count = 0;
143 int attr_size = 0;
144 if (const_method->has_linenumber_table()) {
145 line_num_cnt = line_number_table_entries(method);
146 if (line_num_cnt != 0) {
147 ++attr_count;
148 // Compute the complete size of the line number table attribute:
149 // LineNumberTable_attribute {
150 // u2 attribute_name_index;
151 // u4 attribute_length;
152 // u2 line_number_table_length;
153 // { u2 start_pc;
154 // u2 line_number;
155 // } line_number_table[line_number_table_length];
156 // }
157 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
158 }
159 }
160 if (method->has_stackmap_table()) {
161 stackmap_len = method->stackmap_data()->length();
162 if (stackmap_len != 0) {
163 ++attr_count;
164 // Compute the size of the stack map table attribute (VM stores raw):
165 // StackMapTable_attribute {
166 // u2 attribute_name_index;
167 // u4 attribute_length;
168 // u2 number_of_entries;
169 // stack_map_frame_entries[number_of_entries];
170 // }
171 attr_size += 2 + 4 + stackmap_len;
172 }
173 }
174 if (method->has_localvariable_table()) {
175 local_variable_table_length = method->localvariable_table_length();
176 ++attr_count;
177 if (local_variable_table_length != 0) {
178 // Compute the size of the local variable table attribute (VM stores raw):
179 // LocalVariableTable_attribute {
180 // u2 attribute_name_index;
181 // u4 attribute_length;
182 // u2 local_variable_table_length;
183 // {
184 // u2 start_pc;
185 // u2 length;
186 // u2 name_index;
187 // u2 descriptor_index;
188 // u2 index;
189 // }
190 attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2);
191 }
192 }
193
194 typeArrayHandle exception_table(thread(), const_method->exception_table());
195 int exception_table_length = exception_table->length();
196 int exception_table_entries = exception_table_length / 4;
197 int code_size = const_method->code_size();
198 int size =
199 2+2+4 + // max_stack, max_locals, code_length
200 code_size + // code
201 2 + // exception_table_length
202 (2+2+2+2) * exception_table_entries + // exception_table
203 2 + // attributes_count
204 attr_size; // attributes
205
206 write_attribute_name_index("Code");
207 write_u4(size);
208 write_u2(method->max_stack());
209 write_u2(method->max_locals());
210 write_u4(code_size);
211 copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
212 write_u2(exception_table_entries);
213 for (int index = 0; index < exception_table_length; ) {
214 write_u2(exception_table->int_at(index++));
215 write_u2(exception_table->int_at(index++));
216 write_u2(exception_table->int_at(index++));
217 write_u2(exception_table->int_at(index++));
218 }
219 write_u2(attr_count);
220 if (line_num_cnt != 0) {
221 write_line_number_table_attribute(method, line_num_cnt);
222 }
223 if (stackmap_len != 0) {
224 write_stackmap_table_attribute(method, stackmap_len);
225 }
226 if (local_variable_table_length != 0) {
227 write_local_variable_table_attribute(method, local_variable_table_length);
228 }
229 }
230
231 // Write Exceptions attribute
232 // JVMSpec| Exceptions_attribute {
233 // JVMSpec| u2 attribute_name_index;
234 // JVMSpec| u4 attribute_length;
235 // JVMSpec| u2 number_of_exceptions;
236 // JVMSpec| u2 exception_index_table[number_of_exceptions];
237 // JVMSpec| }
238 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {
239 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
240 int checked_exceptions_length = const_method->checked_exceptions_length();
241 int size =
242 2 + // number_of_exceptions
243 2 * checked_exceptions_length; // exception_index_table
244
245 write_attribute_name_index("Exceptions");
246 write_u4(size);
247 write_u2(checked_exceptions_length);
248 for (int index = 0; index < checked_exceptions_length; index++) {
249 write_u2(checked_exceptions[index].class_cp_index);
250 }
251 }
252
253 // Write SourceFile attribute
254 // JVMSpec| SourceFile_attribute {
255 // JVMSpec| u2 attribute_name_index;
256 // JVMSpec| u4 attribute_length;
257 // JVMSpec| u2 sourcefile_index;
258 // JVMSpec| }
259 void JvmtiClassFileReconstituter::write_source_file_attribute() {
260 assert(ikh()->source_file_name() != NULL, "caller must check");
261
262 write_attribute_name_index("SourceFile");
263 write_u4(2); // always length 2
264 write_u2(symbol_to_cpool_index(ikh()->source_file_name()));
265 }
266
267 // Write SourceDebugExtension attribute
268 // JSR45| SourceDebugExtension_attribute {
269 // JSR45| u2 attribute_name_index;
270 // JSR45| u4 attribute_length;
271 // JSR45| u2 sourcefile_index;
272 // JSR45| }
273 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
274 assert(ikh()->source_debug_extension() != NULL, "caller must check");
275
276 write_attribute_name_index("SourceDebugExtension");
277 write_u4(2); // always length 2
278 write_u2(symbol_to_cpool_index(ikh()->source_debug_extension()));
279 }
280
281 // Write (generic) Signature attribute
282 // JVMSpec| Signature_attribute {
283 // JVMSpec| u2 attribute_name_index;
284 // JVMSpec| u4 attribute_length;
285 // JVMSpec| u2 signature_index;
286 // JVMSpec| }
287 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
288 write_attribute_name_index("Signature");
289 write_u4(2); // always length 2
290 write_u2(generic_signature_index);
291 }
292
293 // Compute the number of entries in the InnerClasses attribute
294 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
295 typeArrayOop inner_class_list = ikh()->inner_classes();
296 return (inner_class_list == NULL) ? 0 : inner_class_list->length();
297 }
298
299 // Write an annotation attribute. The VM stores them in raw form, so all we need
300 // to do is add the attrubute name and fill in the length.
301 // JSR202| *Annotations_attribute {
302 // JSR202| u2 attribute_name_index;
303 // JSR202| u4 attribute_length;
304 // JSR202| ...
305 // JSR202| }
306 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
307 typeArrayHandle annos) {
308 u4 length = annos->length();
309 write_attribute_name_index(attr_name);
310 write_u4(length);
311 memcpy(writeable_address(length), annos->byte_at_addr(0), length);
312 }
313
314
315 // Write InnerClasses attribute
316 // JVMSpec| InnerClasses_attribute {
317 // JVMSpec| u2 attribute_name_index;
318 // JVMSpec| u4 attribute_length;
319 // JVMSpec| u2 number_of_classes;
320 // JVMSpec| { u2 inner_class_info_index;
321 // JVMSpec| u2 outer_class_info_index;
322 // JVMSpec| u2 inner_name_index;
323 // JVMSpec| u2 inner_class_access_flags;
324 // JVMSpec| } classes[number_of_classes];
325 // JVMSpec| }
326 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
327 typeArrayOop inner_class_list = ikh()->inner_classes();
328 guarantee(inner_class_list != NULL && inner_class_list->length() == length,
329 "caller must check");
330 typeArrayHandle inner_class_list_h(thread(), inner_class_list);
331 assert ((length % instanceKlass::inner_class_next_offset == 0 ||
332 length % instanceKlass::inner_class_next_offset == instanceKlass::enclosing_method_attribute_size),
333 "just checking");
334 u2 entry_count = length / instanceKlass::inner_class_next_offset;
335 u4 size = 2 + entry_count * (2+2+2+2);
336
337 write_attribute_name_index("InnerClasses");
338 write_u4(size);
339 write_u2(entry_count);
340 for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) {
341 if (i == length - instanceKlass::enclosing_method_attribute_size) {
342 break;
343 }
344 write_u2(inner_class_list_h->ushort_at(
345 i + instanceKlass::inner_class_inner_class_info_offset));
346 write_u2(inner_class_list_h->ushort_at(
347 i + instanceKlass::inner_class_outer_class_info_offset));
348 write_u2(inner_class_list_h->ushort_at(
349 i + instanceKlass::inner_class_inner_name_offset));
350 write_u2(inner_class_list_h->ushort_at(
351 i + instanceKlass::inner_class_access_flags_offset));
352 }
353 }
354
355 // Write Synthetic attribute
356 // JVMSpec| Synthetic_attribute {
357 // JVMSpec| u2 attribute_name_index;
358 // JVMSpec| u4 attribute_length;
359 // JVMSpec| }
360 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
361 write_attribute_name_index("Synthetic");
362 write_u4(0); //length always zero
363 }
364
365 // Compute size of LineNumberTable
366 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
367 // The line number table is compressed so we don't know how big it is until decompressed.
368 // Decompression is really fast so we just do it twice.
369 u2 num_entries = 0;
370 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
371 while (stream.read_pair()) {
372 num_entries++;
373 }
374 return num_entries;
375 }
376
377 // Write LineNumberTable attribute
378 // JVMSpec| LineNumberTable_attribute {
379 // JVMSpec| u2 attribute_name_index;
380 // JVMSpec| u4 attribute_length;
381 // JVMSpec| u2 line_number_table_length;
382 // JVMSpec| { u2 start_pc;
383 // JVMSpec| u2 line_number;
384 // JVMSpec| } line_number_table[line_number_table_length];
385 // JVMSpec| }
386 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
387 u2 num_entries) {
388
389 write_attribute_name_index("LineNumberTable");
390 write_u4(2 + num_entries * (2 + 2));
391 write_u2(num_entries);
392
393 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
394 while (stream.read_pair()) {
395 write_u2(stream.bci());
396 write_u2(stream.line());
397 }
398 }
399
400 // Write LineNumberTable attribute
401 // JVMSpec| LocalVariableTable_attribute {
402 // JVMSpec| u2 attribute_name_index;
403 // JVMSpec| u4 attribute_length;
404 // JVMSpec| u2 local_variable_table_length;
405 // JVMSpec| { u2 start_pc;
406 // JVMSpec| u2 length;
407 // JVMSpec| u2 name_index;
408 // JVMSpec| u2 descriptor_index;
409 // JVMSpec| u2 index;
410 // JVMSpec| } local_variable_table[local_variable_table_length];
411 // JVMSpec| }
412 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) {
413 write_attribute_name_index("LocalVariableTable");
414 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
415 write_u2(num_entries);
416
417 assert(method->localvariable_table_length() == num_entries, "just checking");
418
419 LocalVariableTableElement *elem = method->localvariable_table_start();
420 for (int j=0; j<method->localvariable_table_length(); j++) {
421 write_u2(elem->start_bci);
422 write_u2(elem->length);
423 write_u2(elem->name_cp_index);
424 write_u2(elem->descriptor_cp_index);
425 write_u2(elem->slot);
426 elem++;
427 }
428 }
429
430 // Write stack map table attribute
431 // JSR-202| StackMapTable_attribute {
432 // JSR-202| u2 attribute_name_index;
433 // JSR-202| u4 attribute_length;
434 // JSR-202| u2 number_of_entries;
435 // JSR-202| stack_map_frame_entries[number_of_entries];
436 // JSR-202| }
437 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
438 int stackmap_len) {
439
440 write_attribute_name_index("StackMapTable");
441 write_u4(stackmap_len);
442 memcpy(
443 writeable_address(stackmap_len),
444 (void*)(method->stackmap_data()->byte_at_addr(0)),
445 stackmap_len);
446 }
447
448 // Write one method_info structure
449 // JVMSpec| method_info {
450 // JVMSpec| u2 access_flags;
451 // JVMSpec| u2 name_index;
452 // JVMSpec| u2 descriptor_index;
453 // JVMSpec| u2 attributes_count;
454 // JVMSpec| attribute_info attributes[attributes_count];
455 // JVMSpec| }
456 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
457 AccessFlags access_flags = method->access_flags();
458 constMethodHandle const_method(thread(), method->constMethod());
459 u2 generic_signature_index = const_method->generic_signature_index();
460 typeArrayHandle anno(thread(), method->annotations());
461 typeArrayHandle param_anno(thread(), method->parameter_annotations());
462 typeArrayHandle default_anno(thread(), method->annotation_default());
463
464 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
465 write_u2(const_method->name_index());
466 write_u2(const_method->signature_index());
467
468 // write attributes in the same order javac does, so we can test with byte for
469 // byte comparison
470 int attr_count = 0;
471 if (const_method->code_size() != 0) {
472 ++attr_count; // has Code attribute
473 }
474 if (const_method->has_checked_exceptions()) {
475 ++attr_count; // has Exceptions attribute
476 }
477 if (default_anno.not_null()) {
478 ++attr_count; // has AnnotationDefault attribute
479 }
480 // Deprecated attribute would go here
481 if (access_flags.is_synthetic()) { // FIXME
482 // ++attr_count;
483 }
484 if (generic_signature_index != 0) {
485 ++attr_count;
486 }
487 if (anno.not_null()) {
488 ++attr_count; // has RuntimeVisibleAnnotations attribute
489 }
490 if (param_anno.not_null()) {
491 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
492 }
493
494 write_u2(attr_count);
495 if (const_method->code_size() > 0) {
496 write_code_attribute(method);
497 }
498 if (const_method->has_checked_exceptions()) {
499 write_exceptions_attribute(const_method);
500 }
501 if (default_anno.not_null()) {
502 write_annotations_attribute("AnnotationDefault", default_anno);
503 }
504 // Deprecated attribute would go here
505 if (access_flags.is_synthetic()) {
506 // write_synthetic_attribute();
507 }
508 if (generic_signature_index != 0) {
509 write_signature_attribute(generic_signature_index);
510 }
511 if (anno.not_null()) {
512 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
513 }
514 if (param_anno.not_null()) {
515 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
516 }
517 }
518
519 // Write the class attributes portion of ClassFile structure
520 // JVMSpec| u2 attributes_count;
521 // JVMSpec| attribute_info attributes[attributes_count];
522 void JvmtiClassFileReconstituter::write_class_attributes() {
523 u2 inner_classes_length = inner_classes_attribute_length();
524 Symbol* generic_signature = ikh()->generic_signature();
525 typeArrayHandle anno(thread(), ikh()->class_annotations());
526
527 int attr_count = 0;
528 if (generic_signature != NULL) {
529 ++attr_count;
530 }
531 if (ikh()->source_file_name() != NULL) {
532 ++attr_count;
533 }
534 if (ikh()->source_debug_extension() != NULL) {
535 ++attr_count;
536 }
537 if (inner_classes_length > 0) {
538 ++attr_count;
539 }
540 if (anno.not_null()) {
541 ++attr_count; // has RuntimeVisibleAnnotations attribute
542 }
543
544 write_u2(attr_count);
545
546 if (generic_signature != NULL) {
547 write_signature_attribute(symbol_to_cpool_index(generic_signature));
548 }
549 if (ikh()->source_file_name() != NULL) {
550 write_source_file_attribute();
551 }
552 if (ikh()->source_debug_extension() != NULL) {
553 write_source_debug_extension_attribute();
554 }
555 if (inner_classes_length > 0) {
556 write_inner_classes_attribute(inner_classes_length);
557 }
558 if (anno.not_null()) {
559 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
560 }
561 }
562
563 // Write the method information portion of ClassFile structure
564 // JVMSpec| u2 methods_count;
565 // JVMSpec| method_info methods[methods_count];
566 void JvmtiClassFileReconstituter::write_method_infos() {
567 HandleMark hm(thread());
568 objArrayHandle methods(thread(), ikh()->methods());
569 int num_methods = methods->length();
570
571 write_u2(num_methods);
572 if (JvmtiExport::can_maintain_original_method_order()) {
573 int index;
574 int original_index;
575 int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);
576
577 // invert the method order mapping
578 for (index = 0; index < num_methods; index++) {
579 original_index = ikh()->method_ordering()->int_at(index);
580 assert(original_index >= 0 && original_index < num_methods,
581 "invalid original method index");
582 method_order[original_index] = index;
583 }
584
585 // write in original order
586 for (original_index = 0; original_index < num_methods; original_index++) {
587 index = method_order[original_index];
588 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
589 write_method_info(method);
590 }
591 } else {
592 // method order not preserved just dump the method infos
593 for (int index = 0; index < num_methods; index++) {
594 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
595 write_method_info(method);
596 }
597 }
598 }
599
600 void JvmtiClassFileReconstituter::write_class_file_format() {
601 ReallocMark();
602
603 // JVMSpec| ClassFile {
604 // JVMSpec| u4 magic;
605 write_u4(0xCAFEBABE);
606
607 // JVMSpec| u2 minor_version;
608 // JVMSpec| u2 major_version;
609 write_u2(ikh()->minor_version());
610 u2 major = ikh()->major_version();
611 write_u2(major);
612
613 // JVMSpec| u2 constant_pool_count;
614 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
615 write_u2(cpool()->length());
616 copy_cpool_bytes(writeable_address(cpool_size()));
617
618 // JVMSpec| u2 access_flags;
619 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
620
621 // JVMSpec| u2 this_class;
622 // JVMSpec| u2 super_class;
623 write_u2(class_symbol_to_cpool_index(ikh()->name()));
624 klassOop super_class = ikh()->super();
625 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
626 class_symbol_to_cpool_index(super_class->klass_part()->name()));
627
628 // JVMSpec| u2 interfaces_count;
629 // JVMSpec| u2 interfaces[interfaces_count];
630 objArrayHandle interfaces(thread(), ikh()->local_interfaces());
631 int num_interfaces = interfaces->length();
632 write_u2(num_interfaces);
633 for (int index = 0; index < num_interfaces; index++) {
634 HandleMark hm(thread());
635 instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));
636 write_u2(class_symbol_to_cpool_index(iikh->name()));
637 }
638
639 // JVMSpec| u2 fields_count;
640 // JVMSpec| field_info fields[fields_count];
641 write_field_infos();
642
643 // JVMSpec| u2 methods_count;
644 // JVMSpec| method_info methods[methods_count];
645 write_method_infos();
646
647 // JVMSpec| u2 attributes_count;
648 // JVMSpec| attribute_info attributes[attributes_count];
649 // JVMSpec| } /* end ClassFile 8?
650 write_class_attributes();
651 }
652
653 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
654 size_t used_size = _buffer_ptr - _buffer;
655 if (size + used_size >= _buffer_size) {
656 // compute the new buffer size: must be at least twice as big as before
657 // plus whatever new is being used; then convert to nice clean block boundary
658 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
659 * initial_buffer_size;
660
661 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
662 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
663 _buffer_size = new_buffer_size;
664 _buffer_ptr = _buffer + used_size;
665 }
666 u1* ret_ptr = _buffer_ptr;
667 _buffer_ptr += size;
668 return ret_ptr;
669 }
670
671 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
672 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
673 assert(sym != NULL, "attribute name symbol not found");
674 u2 attr_name_index = symbol_to_cpool_index(sym);
675 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
676 write_u2(attr_name_index);
677 }
678
679 void JvmtiClassFileReconstituter::write_u1(u1 x) {
680 *writeable_address(1) = x;
681 }
682
683 void JvmtiClassFileReconstituter::write_u2(u2 x) {
684 Bytes::put_Java_u2(writeable_address(2), x);
685 }
686
687 void JvmtiClassFileReconstituter::write_u4(u4 x) {
688 Bytes::put_Java_u4(writeable_address(4), x);
689 }
690
691 void JvmtiClassFileReconstituter::write_u8(u8 x) {
692 Bytes::put_Java_u8(writeable_address(8), x);
693 }
694
695 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
696 unsigned char* bytecodes) {
697 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
698 // and the breakpoint bytecode are converted to their original bytecodes.
699
700 BytecodeStream bs(mh);
701
702 unsigned char* p = bytecodes;
703 Bytecodes::Code code;
704 bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();
705
706 while ((code = bs.next()) >= 0) {
707 assert(Bytecodes::is_java_code(code), "sanity check");
708 assert(code != Bytecodes::_breakpoint, "sanity check");
709
710 // length of bytecode (mnemonic + operands)
711 address bcp = bs.bcp();
712 int len = bs.instruction_size();
713 assert(len > 0, "length must be > 0");
714
715 // copy the bytecodes
716 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
717 if (len > 1) {
718 memcpy(p+1, bcp+1, len-1);
719 }
720
721 // During linking the get/put and invoke instructions are rewritten
722 // with an index into the constant pool cache. The original constant
723 // pool index must be returned to caller. Rewrite the index.
724 if (is_rewritten && len >= 3) {
725 switch (code) {
726 case Bytecodes::_getstatic : // fall through
727 case Bytecodes::_putstatic : // fall through
728 case Bytecodes::_getfield : // fall through
729 case Bytecodes::_putfield : // fall through
730 case Bytecodes::_invokevirtual : // fall through
731 case Bytecodes::_invokespecial : // fall through
732 case Bytecodes::_invokestatic : // fall through
733 case Bytecodes::_invokedynamic : // fall through
734 case Bytecodes::_invokeinterface :
735 assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5),
736 "sanity check");
737 int cpci = Bytes::get_native_u2(bcp+1);
738 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);
739 if (is_invokedynamic)
740 cpci = Bytes::get_native_u4(bcp+1);
741 // cache cannot be pre-fetched since some classes won't have it yet
742 ConstantPoolCacheEntry* entry =
743 mh->constants()->cache()->main_entry_at(cpci);
744 int i = entry->constant_pool_index();
745 assert(i < mh->constants()->length(), "sanity check");
746 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
747 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
748 break;
749 }
750 }
751
752 p += len;
753 }
754 }