Thu, 24 Jan 2013 22:13:32 -0800
8005128: JSR 292: the mlvm redefineClassInBootstrap test crashes in ConstantPool::compare_entry_to
Summary: When constant pool is copied in merge_constant_pools the invokedynamic operands must be copied before.
Reviewed-by: coleenp, twisti
Contributed-by: serguei.spitsyn@oracle.com
1 /*
2 * Copyright (c) 2005, 2012, 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 */
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()
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();
58 // Compute the real number of Java fields
59 int java_fields = ikh()->java_fields_count();
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());
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| }
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 }
97 write_u2(attr_count);
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 }
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;
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);
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 }
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 }
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
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 }
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
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 }
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");
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 }
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");
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 }
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 }
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 }
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 }
345 // Write InnerClasses attribute
346 // JVMSpec| InnerClasses_attribute {
347 // JVMSpec| u2 attribute_name_index;
348 // JVMSpec| u4 attribute_length;
349 // JVMSpec| u2 number_of_classes;
350 // JVMSpec| { u2 inner_class_info_index;
351 // JVMSpec| u2 outer_class_info_index;
352 // JVMSpec| u2 inner_name_index;
353 // JVMSpec| u2 inner_class_access_flags;
354 // JVMSpec| } classes[number_of_classes];
355 // JVMSpec| }
356 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
357 InnerClassesIterator iter(ikh());
358 guarantee(iter.length() != 0 && iter.length() == length,
359 "caller must check");
360 u2 entry_count = length / InstanceKlass::inner_class_next_offset;
361 u4 size = 2 + entry_count * (2+2+2+2);
363 write_attribute_name_index("InnerClasses");
364 write_u4(size);
365 write_u2(entry_count);
366 for (; !iter.done(); iter.next()) {
367 write_u2(iter.inner_class_info_index());
368 write_u2(iter.outer_class_info_index());
369 write_u2(iter.inner_name_index());
370 write_u2(iter.inner_access_flags());
371 }
372 }
374 // Write Synthetic attribute
375 // JVMSpec| Synthetic_attribute {
376 // JVMSpec| u2 attribute_name_index;
377 // JVMSpec| u4 attribute_length;
378 // JVMSpec| }
379 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
380 write_attribute_name_index("Synthetic");
381 write_u4(0); //length always zero
382 }
384 // Compute size of LineNumberTable
385 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
386 // The line number table is compressed so we don't know how big it is until decompressed.
387 // Decompression is really fast so we just do it twice.
388 u2 num_entries = 0;
389 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
390 while (stream.read_pair()) {
391 num_entries++;
392 }
393 return num_entries;
394 }
396 // Write LineNumberTable attribute
397 // JVMSpec| LineNumberTable_attribute {
398 // JVMSpec| u2 attribute_name_index;
399 // JVMSpec| u4 attribute_length;
400 // JVMSpec| u2 line_number_table_length;
401 // JVMSpec| { u2 start_pc;
402 // JVMSpec| u2 line_number;
403 // JVMSpec| } line_number_table[line_number_table_length];
404 // JVMSpec| }
405 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
406 u2 num_entries) {
408 write_attribute_name_index("LineNumberTable");
409 write_u4(2 + num_entries * (2 + 2));
410 write_u2(num_entries);
412 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
413 while (stream.read_pair()) {
414 write_u2(stream.bci());
415 write_u2(stream.line());
416 }
417 }
419 // Write LocalVariableTable attribute
420 // JVMSpec| LocalVariableTable_attribute {
421 // JVMSpec| u2 attribute_name_index;
422 // JVMSpec| u4 attribute_length;
423 // JVMSpec| u2 local_variable_table_length;
424 // JVMSpec| { u2 start_pc;
425 // JVMSpec| u2 length;
426 // JVMSpec| u2 name_index;
427 // JVMSpec| u2 descriptor_index;
428 // JVMSpec| u2 index;
429 // JVMSpec| } local_variable_table[local_variable_table_length];
430 // JVMSpec| }
431 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) {
432 write_attribute_name_index("LocalVariableTable");
433 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
434 write_u2(num_entries);
436 assert(method->localvariable_table_length() == num_entries, "just checking");
438 LocalVariableTableElement *elem = method->localvariable_table_start();
439 for (int j=0; j<method->localvariable_table_length(); j++) {
440 write_u2(elem->start_bci);
441 write_u2(elem->length);
442 write_u2(elem->name_cp_index);
443 write_u2(elem->descriptor_cp_index);
444 write_u2(elem->slot);
445 elem++;
446 }
447 }
449 // Write LocalVariableTypeTable attribute
450 // JVMSpec| LocalVariableTypeTable_attribute {
451 // JVMSpec| u2 attribute_name_index;
452 // JVMSpec| u4 attribute_length;
453 // JVMSpec| u2 local_variable_type_table_length;
454 // JVMSpec| { u2 start_pc;
455 // JVMSpec| u2 length;
456 // JVMSpec| u2 name_index;
457 // JVMSpec| u2 signature_index;
458 // JVMSpec| u2 index;
459 // JVMSpec| } local_variable_type_table[local_variable_type_table_length];
460 // JVMSpec| }
461 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(methodHandle method, u2 num_entries) {
462 write_attribute_name_index("LocalVariableTypeTable");
463 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
464 write_u2(num_entries);
466 LocalVariableTableElement *elem = method->localvariable_table_start();
467 for (int j=0; j<method->localvariable_table_length(); j++) {
468 if (elem->signature_cp_index > 0) {
469 // Local variable has a generic signature - write LVTT attribute entry
470 write_u2(elem->start_bci);
471 write_u2(elem->length);
472 write_u2(elem->name_cp_index);
473 write_u2(elem->signature_cp_index);
474 write_u2(elem->slot);
475 num_entries--;
476 }
477 elem++;
478 }
479 assert(num_entries == 0, "just checking");
480 }
482 // Write stack map table attribute
483 // JSR-202| StackMapTable_attribute {
484 // JSR-202| u2 attribute_name_index;
485 // JSR-202| u4 attribute_length;
486 // JSR-202| u2 number_of_entries;
487 // JSR-202| stack_map_frame_entries[number_of_entries];
488 // JSR-202| }
489 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
490 int stackmap_len) {
492 write_attribute_name_index("StackMapTable");
493 write_u4(stackmap_len);
494 memcpy(
495 writeable_address(stackmap_len),
496 (void*)(method->stackmap_data()->adr_at(0)),
497 stackmap_len);
498 }
500 // Write one method_info structure
501 // JVMSpec| method_info {
502 // JVMSpec| u2 access_flags;
503 // JVMSpec| u2 name_index;
504 // JVMSpec| u2 descriptor_index;
505 // JVMSpec| u2 attributes_count;
506 // JVMSpec| attribute_info attributes[attributes_count];
507 // JVMSpec| }
508 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
509 AccessFlags access_flags = method->access_flags();
510 ConstMethod* const_method = method->constMethod();
511 u2 generic_signature_index = const_method->generic_signature_index();
512 AnnotationArray* anno = method->annotations();
513 AnnotationArray* param_anno = method->parameter_annotations();
514 AnnotationArray* default_anno = method->annotation_default();
516 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
517 write_u2(const_method->name_index());
518 write_u2(const_method->signature_index());
520 // write attributes in the same order javac does, so we can test with byte for
521 // byte comparison
522 int attr_count = 0;
523 if (const_method->code_size() != 0) {
524 ++attr_count; // has Code attribute
525 }
526 if (const_method->has_checked_exceptions()) {
527 ++attr_count; // has Exceptions attribute
528 }
529 if (default_anno != NULL) {
530 ++attr_count; // has AnnotationDefault attribute
531 }
532 // Deprecated attribute would go here
533 if (access_flags.is_synthetic()) { // FIXME
534 // ++attr_count;
535 }
536 if (generic_signature_index != 0) {
537 ++attr_count;
538 }
539 if (anno != NULL) {
540 ++attr_count; // has RuntimeVisibleAnnotations attribute
541 }
542 if (param_anno != NULL) {
543 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
544 }
546 write_u2(attr_count);
547 if (const_method->code_size() > 0) {
548 write_code_attribute(method);
549 }
550 if (const_method->has_checked_exceptions()) {
551 write_exceptions_attribute(const_method);
552 }
553 if (default_anno != NULL) {
554 write_annotations_attribute("AnnotationDefault", default_anno);
555 }
556 // Deprecated attribute would go here
557 if (access_flags.is_synthetic()) {
558 // write_synthetic_attribute();
559 }
560 if (generic_signature_index != 0) {
561 write_signature_attribute(generic_signature_index);
562 }
563 if (anno != NULL) {
564 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
565 }
566 if (param_anno != NULL) {
567 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
568 }
569 }
571 // Write the class attributes portion of ClassFile structure
572 // JVMSpec| u2 attributes_count;
573 // JVMSpec| attribute_info attributes[attributes_count];
574 void JvmtiClassFileReconstituter::write_class_attributes() {
575 u2 inner_classes_length = inner_classes_attribute_length();
576 Symbol* generic_signature = ikh()->generic_signature();
577 AnnotationArray* anno = ikh()->class_annotations();
579 int attr_count = 0;
580 if (generic_signature != NULL) {
581 ++attr_count;
582 }
583 if (ikh()->source_file_name() != NULL) {
584 ++attr_count;
585 }
586 if (ikh()->source_debug_extension() != NULL) {
587 ++attr_count;
588 }
589 if (inner_classes_length > 0) {
590 ++attr_count;
591 }
592 if (anno != NULL) {
593 ++attr_count; // has RuntimeVisibleAnnotations attribute
594 }
596 write_u2(attr_count);
598 if (generic_signature != NULL) {
599 write_signature_attribute(symbol_to_cpool_index(generic_signature));
600 }
601 if (ikh()->source_file_name() != NULL) {
602 write_source_file_attribute();
603 }
604 if (ikh()->source_debug_extension() != NULL) {
605 write_source_debug_extension_attribute();
606 }
607 if (inner_classes_length > 0) {
608 write_inner_classes_attribute(inner_classes_length);
609 }
610 if (anno != NULL) {
611 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
612 }
613 }
615 // Write the method information portion of ClassFile structure
616 // JVMSpec| u2 methods_count;
617 // JVMSpec| method_info methods[methods_count];
618 void JvmtiClassFileReconstituter::write_method_infos() {
619 HandleMark hm(thread());
620 Array<Method*>* methods = ikh()->methods();
621 int num_methods = methods->length();
623 write_u2(num_methods);
624 if (JvmtiExport::can_maintain_original_method_order()) {
625 int index;
626 int original_index;
627 intArray method_order(num_methods, 0);
629 // invert the method order mapping
630 for (index = 0; index < num_methods; index++) {
631 original_index = ikh()->method_ordering()->at(index);
632 assert(original_index >= 0 && original_index < num_methods,
633 "invalid original method index");
634 method_order.at_put(original_index, index);
635 }
637 // write in original order
638 for (original_index = 0; original_index < num_methods; original_index++) {
639 index = method_order.at(original_index);
640 methodHandle method(thread(), methods->at(index));
641 write_method_info(method);
642 }
643 } else {
644 // method order not preserved just dump the method infos
645 for (int index = 0; index < num_methods; index++) {
646 methodHandle method(thread(), methods->at(index));
647 write_method_info(method);
648 }
649 }
650 }
652 void JvmtiClassFileReconstituter::write_class_file_format() {
653 ReallocMark();
655 // JVMSpec| ClassFile {
656 // JVMSpec| u4 magic;
657 write_u4(0xCAFEBABE);
659 // JVMSpec| u2 minor_version;
660 // JVMSpec| u2 major_version;
661 write_u2(ikh()->minor_version());
662 u2 major = ikh()->major_version();
663 write_u2(major);
665 // JVMSpec| u2 constant_pool_count;
666 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
667 write_u2(cpool()->length());
668 copy_cpool_bytes(writeable_address(cpool_size()));
670 // JVMSpec| u2 access_flags;
671 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
673 // JVMSpec| u2 this_class;
674 // JVMSpec| u2 super_class;
675 write_u2(class_symbol_to_cpool_index(ikh()->name()));
676 Klass* super_class = ikh()->super();
677 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
678 class_symbol_to_cpool_index(super_class->name()));
680 // JVMSpec| u2 interfaces_count;
681 // JVMSpec| u2 interfaces[interfaces_count];
682 Array<Klass*>* interfaces = ikh()->local_interfaces();
683 int num_interfaces = interfaces->length();
684 write_u2(num_interfaces);
685 for (int index = 0; index < num_interfaces; index++) {
686 HandleMark hm(thread());
687 instanceKlassHandle iikh(thread(), interfaces->at(index));
688 write_u2(class_symbol_to_cpool_index(iikh->name()));
689 }
691 // JVMSpec| u2 fields_count;
692 // JVMSpec| field_info fields[fields_count];
693 write_field_infos();
695 // JVMSpec| u2 methods_count;
696 // JVMSpec| method_info methods[methods_count];
697 write_method_infos();
699 // JVMSpec| u2 attributes_count;
700 // JVMSpec| attribute_info attributes[attributes_count];
701 // JVMSpec| } /* end ClassFile 8?
702 write_class_attributes();
703 }
705 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
706 size_t used_size = _buffer_ptr - _buffer;
707 if (size + used_size >= _buffer_size) {
708 // compute the new buffer size: must be at least twice as big as before
709 // plus whatever new is being used; then convert to nice clean block boundary
710 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
711 * initial_buffer_size;
713 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
714 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
715 _buffer_size = new_buffer_size;
716 _buffer_ptr = _buffer + used_size;
717 }
718 u1* ret_ptr = _buffer_ptr;
719 _buffer_ptr += size;
720 return ret_ptr;
721 }
723 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
724 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
725 assert(sym != NULL, "attribute name symbol not found");
726 u2 attr_name_index = symbol_to_cpool_index(sym);
727 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
728 write_u2(attr_name_index);
729 }
731 void JvmtiClassFileReconstituter::write_u1(u1 x) {
732 *writeable_address(1) = x;
733 }
735 void JvmtiClassFileReconstituter::write_u2(u2 x) {
736 Bytes::put_Java_u2(writeable_address(2), x);
737 }
739 void JvmtiClassFileReconstituter::write_u4(u4 x) {
740 Bytes::put_Java_u4(writeable_address(4), x);
741 }
743 void JvmtiClassFileReconstituter::write_u8(u8 x) {
744 Bytes::put_Java_u8(writeable_address(8), x);
745 }
747 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
748 unsigned char* bytecodes) {
749 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
750 // and the breakpoint bytecode are converted to their original bytecodes.
752 BytecodeStream bs(mh);
754 unsigned char* p = bytecodes;
755 Bytecodes::Code code;
756 bool is_rewritten = mh->method_holder()->is_rewritten();
758 while ((code = bs.next()) >= 0) {
759 assert(Bytecodes::is_java_code(code), "sanity check");
760 assert(code != Bytecodes::_breakpoint, "sanity check");
762 // length of bytecode (mnemonic + operands)
763 address bcp = bs.bcp();
764 int len = bs.instruction_size();
765 assert(len > 0, "length must be > 0");
767 // copy the bytecodes
768 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
769 if (len > 1) {
770 memcpy(p+1, bcp+1, len-1);
771 }
773 // During linking the get/put and invoke instructions are rewritten
774 // with an index into the constant pool cache. The original constant
775 // pool index must be returned to caller. Rewrite the index.
776 if (is_rewritten && len > 1) {
777 bool is_wide = false;
778 switch (code) {
779 case Bytecodes::_getstatic : // fall through
780 case Bytecodes::_putstatic : // fall through
781 case Bytecodes::_getfield : // fall through
782 case Bytecodes::_putfield : // fall through
783 case Bytecodes::_invokevirtual : // fall through
784 case Bytecodes::_invokespecial : // fall through
785 case Bytecodes::_invokestatic : // fall through
786 case Bytecodes::_invokedynamic : // fall through
787 case Bytecodes::_invokeinterface : {
788 assert(len == 3 ||
789 (code == Bytecodes::_invokeinterface && len == 5) ||
790 (code == Bytecodes::_invokedynamic && len == 5),
791 "sanity check");
793 int cpci = Bytes::get_native_u2(bcp+1);
794 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);
795 ConstantPoolCacheEntry* entry;
796 if (is_invokedynamic) {
797 cpci = Bytes::get_native_u4(bcp+1);
798 entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);
799 } else {
800 // cache cannot be pre-fetched since some classes won't have it yet
801 entry = mh->constants()->cache()->entry_at(cpci);
802 }
803 int i = entry->constant_pool_index();
804 assert(i < mh->constants()->length(), "sanity check");
805 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
806 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
807 break;
808 }
809 case Bytecodes::_ldc_w:
810 is_wide = true; // fall through
811 case Bytecodes::_ldc: {
812 if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {
813 int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));
814 int i = mh->constants()->object_to_cp_index(cpci);
815 assert(i < mh->constants()->length(), "sanity check");
816 if (is_wide) {
817 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
818 } else {
819 *(p+1) = (u1)i;
820 }
821 }
822 break;
823 }
824 }
825 }
827 p += len;
828 }
829 }