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 */
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 InnerClassesIterator iter(ikh());
296 return iter.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 InnerClassesIterator iter(ikh());
328 guarantee(iter.length() != 0 && iter.length() == length,
329 "caller must check");
330 u2 entry_count = length / instanceKlass::inner_class_next_offset;
331 u4 size = 2 + entry_count * (2+2+2+2);
332
333 write_attribute_name_index("InnerClasses");
334 write_u4(size);
335 write_u2(entry_count);
336 for (; !iter.done(); iter.next()) {
337 write_u2(iter.inner_class_info_index());
338 write_u2(iter.outer_class_info_index());
339 write_u2(iter.inner_name_index());
340 write_u2(iter.inner_access_flags());
341 }
342 }
343
344 // Write Synthetic attribute
345 // JVMSpec| Synthetic_attribute {
346 // JVMSpec| u2 attribute_name_index;
347 // JVMSpec| u4 attribute_length;
348 // JVMSpec| }
349 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
350 write_attribute_name_index("Synthetic");
351 write_u4(0); //length always zero
352 }
353
354 // Compute size of LineNumberTable
355 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
356 // The line number table is compressed so we don't know how big it is until decompressed.
357 // Decompression is really fast so we just do it twice.
358 u2 num_entries = 0;
359 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
360 while (stream.read_pair()) {
361 num_entries++;
362 }
363 return num_entries;
364 }
365
366 // Write LineNumberTable attribute
367 // JVMSpec| LineNumberTable_attribute {
368 // JVMSpec| u2 attribute_name_index;
369 // JVMSpec| u4 attribute_length;
370 // JVMSpec| u2 line_number_table_length;
371 // JVMSpec| { u2 start_pc;
372 // JVMSpec| u2 line_number;
373 // JVMSpec| } line_number_table[line_number_table_length];
374 // JVMSpec| }
375 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
376 u2 num_entries) {
377
378 write_attribute_name_index("LineNumberTable");
379 write_u4(2 + num_entries * (2 + 2));
380 write_u2(num_entries);
381
382 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
383 while (stream.read_pair()) {
384 write_u2(stream.bci());
385 write_u2(stream.line());
386 }
387 }
388
389 // Write LineNumberTable attribute
390 // JVMSpec| LocalVariableTable_attribute {
391 // JVMSpec| u2 attribute_name_index;
392 // JVMSpec| u4 attribute_length;
393 // JVMSpec| u2 local_variable_table_length;
394 // JVMSpec| { u2 start_pc;
395 // JVMSpec| u2 length;
396 // JVMSpec| u2 name_index;
397 // JVMSpec| u2 descriptor_index;
398 // JVMSpec| u2 index;
399 // JVMSpec| } local_variable_table[local_variable_table_length];
400 // JVMSpec| }
401 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) {
402 write_attribute_name_index("LocalVariableTable");
403 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
404 write_u2(num_entries);
405
406 assert(method->localvariable_table_length() == num_entries, "just checking");
407
408 LocalVariableTableElement *elem = method->localvariable_table_start();
409 for (int j=0; j<method->localvariable_table_length(); j++) {
410 write_u2(elem->start_bci);
411 write_u2(elem->length);
412 write_u2(elem->name_cp_index);
413 write_u2(elem->descriptor_cp_index);
414 write_u2(elem->slot);
415 elem++;
416 }
417 }
418
419 // Write stack map table attribute
420 // JSR-202| StackMapTable_attribute {
421 // JSR-202| u2 attribute_name_index;
422 // JSR-202| u4 attribute_length;
423 // JSR-202| u2 number_of_entries;
424 // JSR-202| stack_map_frame_entries[number_of_entries];
425 // JSR-202| }
426 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
427 int stackmap_len) {
428
429 write_attribute_name_index("StackMapTable");
430 write_u4(stackmap_len);
431 memcpy(
432 writeable_address(stackmap_len),
433 (void*)(method->stackmap_data()->byte_at_addr(0)),
434 stackmap_len);
435 }
436
437 // Write one method_info structure
438 // JVMSpec| method_info {
439 // JVMSpec| u2 access_flags;
440 // JVMSpec| u2 name_index;
441 // JVMSpec| u2 descriptor_index;
442 // JVMSpec| u2 attributes_count;
443 // JVMSpec| attribute_info attributes[attributes_count];
444 // JVMSpec| }
445 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
446 AccessFlags access_flags = method->access_flags();
447 constMethodHandle const_method(thread(), method->constMethod());
448 u2 generic_signature_index = const_method->generic_signature_index();
449 typeArrayHandle anno(thread(), method->annotations());
450 typeArrayHandle param_anno(thread(), method->parameter_annotations());
451 typeArrayHandle default_anno(thread(), method->annotation_default());
452
453 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
454 write_u2(const_method->name_index());
455 write_u2(const_method->signature_index());
456
457 // write attributes in the same order javac does, so we can test with byte for
458 // byte comparison
459 int attr_count = 0;
460 if (const_method->code_size() != 0) {
461 ++attr_count; // has Code attribute
462 }
463 if (const_method->has_checked_exceptions()) {
464 ++attr_count; // has Exceptions attribute
465 }
466 if (default_anno.not_null()) {
467 ++attr_count; // has AnnotationDefault attribute
468 }
469 // Deprecated attribute would go here
470 if (access_flags.is_synthetic()) { // FIXME
471 // ++attr_count;
472 }
473 if (generic_signature_index != 0) {
474 ++attr_count;
475 }
476 if (anno.not_null()) {
477 ++attr_count; // has RuntimeVisibleAnnotations attribute
478 }
479 if (param_anno.not_null()) {
480 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
481 }
482
483 write_u2(attr_count);
484 if (const_method->code_size() > 0) {
485 write_code_attribute(method);
486 }
487 if (const_method->has_checked_exceptions()) {
488 write_exceptions_attribute(const_method);
489 }
490 if (default_anno.not_null()) {
491 write_annotations_attribute("AnnotationDefault", default_anno);
492 }
493 // Deprecated attribute would go here
494 if (access_flags.is_synthetic()) {
495 // write_synthetic_attribute();
496 }
497 if (generic_signature_index != 0) {
498 write_signature_attribute(generic_signature_index);
499 }
500 if (anno.not_null()) {
501 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
502 }
503 if (param_anno.not_null()) {
504 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
505 }
506 }
507
508 // Write the class attributes portion of ClassFile structure
509 // JVMSpec| u2 attributes_count;
510 // JVMSpec| attribute_info attributes[attributes_count];
511 void JvmtiClassFileReconstituter::write_class_attributes() {
512 u2 inner_classes_length = inner_classes_attribute_length();
513 Symbol* generic_signature = ikh()->generic_signature();
514 typeArrayHandle anno(thread(), ikh()->class_annotations());
515
516 int attr_count = 0;
517 if (generic_signature != NULL) {
518 ++attr_count;
519 }
520 if (ikh()->source_file_name() != NULL) {
521 ++attr_count;
522 }
523 if (ikh()->source_debug_extension() != NULL) {
524 ++attr_count;
525 }
526 if (inner_classes_length > 0) {
527 ++attr_count;
528 }
529 if (anno.not_null()) {
530 ++attr_count; // has RuntimeVisibleAnnotations attribute
531 }
532
533 write_u2(attr_count);
534
535 if (generic_signature != NULL) {
536 write_signature_attribute(symbol_to_cpool_index(generic_signature));
537 }
538 if (ikh()->source_file_name() != NULL) {
539 write_source_file_attribute();
540 }
541 if (ikh()->source_debug_extension() != NULL) {
542 write_source_debug_extension_attribute();
543 }
544 if (inner_classes_length > 0) {
545 write_inner_classes_attribute(inner_classes_length);
546 }
547 if (anno.not_null()) {
548 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
549 }
550 }
551
552 // Write the method information portion of ClassFile structure
553 // JVMSpec| u2 methods_count;
554 // JVMSpec| method_info methods[methods_count];
555 void JvmtiClassFileReconstituter::write_method_infos() {
556 HandleMark hm(thread());
557 objArrayHandle methods(thread(), ikh()->methods());
558 int num_methods = methods->length();
559
560 write_u2(num_methods);
561 if (JvmtiExport::can_maintain_original_method_order()) {
562 int index;
563 int original_index;
564 int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);
565
566 // invert the method order mapping
567 for (index = 0; index < num_methods; index++) {
568 original_index = ikh()->method_ordering()->int_at(index);
569 assert(original_index >= 0 && original_index < num_methods,
570 "invalid original method index");
571 method_order[original_index] = index;
572 }
573
574 // write in original order
575 for (original_index = 0; original_index < num_methods; original_index++) {
576 index = method_order[original_index];
577 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
578 write_method_info(method);
579 }
580 } else {
581 // method order not preserved just dump the method infos
582 for (int index = 0; index < num_methods; index++) {
583 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
584 write_method_info(method);
585 }
586 }
587 }
588
589 void JvmtiClassFileReconstituter::write_class_file_format() {
590 ReallocMark();
591
592 // JVMSpec| ClassFile {
593 // JVMSpec| u4 magic;
594 write_u4(0xCAFEBABE);
595
596 // JVMSpec| u2 minor_version;
597 // JVMSpec| u2 major_version;
598 write_u2(ikh()->minor_version());
599 u2 major = ikh()->major_version();
600 write_u2(major);
601
602 // JVMSpec| u2 constant_pool_count;
603 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
604 write_u2(cpool()->length());
605 copy_cpool_bytes(writeable_address(cpool_size()));
606
607 // JVMSpec| u2 access_flags;
608 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
609
610 // JVMSpec| u2 this_class;
611 // JVMSpec| u2 super_class;
612 write_u2(class_symbol_to_cpool_index(ikh()->name()));
613 klassOop super_class = ikh()->super();
614 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
615 class_symbol_to_cpool_index(super_class->klass_part()->name()));
616
617 // JVMSpec| u2 interfaces_count;
618 // JVMSpec| u2 interfaces[interfaces_count];
619 objArrayHandle interfaces(thread(), ikh()->local_interfaces());
620 int num_interfaces = interfaces->length();
621 write_u2(num_interfaces);
622 for (int index = 0; index < num_interfaces; index++) {
623 HandleMark hm(thread());
624 instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));
625 write_u2(class_symbol_to_cpool_index(iikh->name()));
626 }
627
628 // JVMSpec| u2 fields_count;
629 // JVMSpec| field_info fields[fields_count];
630 write_field_infos();
631
632 // JVMSpec| u2 methods_count;
633 // JVMSpec| method_info methods[methods_count];
634 write_method_infos();
635
636 // JVMSpec| u2 attributes_count;
637 // JVMSpec| attribute_info attributes[attributes_count];
638 // JVMSpec| } /* end ClassFile 8?
639 write_class_attributes();
640 }
641
642 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
643 size_t used_size = _buffer_ptr - _buffer;
644 if (size + used_size >= _buffer_size) {
645 // compute the new buffer size: must be at least twice as big as before
646 // plus whatever new is being used; then convert to nice clean block boundary
647 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
648 * initial_buffer_size;
649
650 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
651 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
652 _buffer_size = new_buffer_size;
653 _buffer_ptr = _buffer + used_size;
654 }
655 u1* ret_ptr = _buffer_ptr;
656 _buffer_ptr += size;
657 return ret_ptr;
658 }
659
660 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
661 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
662 assert(sym != NULL, "attribute name symbol not found");
663 u2 attr_name_index = symbol_to_cpool_index(sym);
664 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
665 write_u2(attr_name_index);
666 }
667
668 void JvmtiClassFileReconstituter::write_u1(u1 x) {
669 *writeable_address(1) = x;
670 }
671
672 void JvmtiClassFileReconstituter::write_u2(u2 x) {
673 Bytes::put_Java_u2(writeable_address(2), x);
674 }
675
676 void JvmtiClassFileReconstituter::write_u4(u4 x) {
677 Bytes::put_Java_u4(writeable_address(4), x);
678 }
679
680 void JvmtiClassFileReconstituter::write_u8(u8 x) {
681 Bytes::put_Java_u8(writeable_address(8), x);
682 }
683
684 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
685 unsigned char* bytecodes) {
686 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
687 // and the breakpoint bytecode are converted to their original bytecodes.
688
689 BytecodeStream bs(mh);
690
691 unsigned char* p = bytecodes;
692 Bytecodes::Code code;
693 bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();
694
695 while ((code = bs.next()) >= 0) {
696 assert(Bytecodes::is_java_code(code), "sanity check");
697 assert(code != Bytecodes::_breakpoint, "sanity check");
698
699 // length of bytecode (mnemonic + operands)
700 address bcp = bs.bcp();
701 int len = bs.instruction_size();
702 assert(len > 0, "length must be > 0");
703
704 // copy the bytecodes
705 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
706 if (len > 1) {
707 memcpy(p+1, bcp+1, len-1);
708 }
709
710 // During linking the get/put and invoke instructions are rewritten
711 // with an index into the constant pool cache. The original constant
712 // pool index must be returned to caller. Rewrite the index.
713 if (is_rewritten && len >= 3) {
714 switch (code) {
715 case Bytecodes::_getstatic : // fall through
716 case Bytecodes::_putstatic : // fall through
717 case Bytecodes::_getfield : // fall through
718 case Bytecodes::_putfield : // fall through
719 case Bytecodes::_invokevirtual : // fall through
720 case Bytecodes::_invokespecial : // fall through
721 case Bytecodes::_invokestatic : // fall through
722 case Bytecodes::_invokedynamic : // fall through
723 case Bytecodes::_invokeinterface :
724 assert(len == 3 ||
725 (code == Bytecodes::_invokeinterface && len == 5) ||
726 (code == Bytecodes::_invokedynamic && len == 5),
727 "sanity check");
728
729 int cpci = Bytes::get_native_u2(bcp+1);
730 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);
731 if (is_invokedynamic)
732 cpci = Bytes::get_native_u4(bcp+1);
733 // cache cannot be pre-fetched since some classes won't have it yet
734 ConstantPoolCacheEntry* entry =
735 mh->constants()->cache()->main_entry_at(cpci);
736 int i = entry->constant_pool_index();
737 assert(i < mh->constants()->length(), "sanity check");
738 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
739 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
740 break;
741 }
742 }
743
744 p += len;
745 }
746 }