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comparison src/share/vm/prims/jvmtiClassFileReconstituter.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24 # include "incls/_precompiled.incl"
25 # include "incls/_jvmtiClassFileReconstituter.cpp.incl"
26
27 // FIXME: add Deprecated, LVT, LVTT attributes
28 // FIXME: fix Synthetic attribute
29 // FIXME: per Serguei, add error return handling for constantPoolOopDesc::copy_cpool_bytes()
30
31
32 // Write the field information portion of ClassFile structure
33 // JVMSpec| u2 fields_count;
34 // JVMSpec| field_info fields[fields_count];
35 void JvmtiClassFileReconstituter::write_field_infos() {
36 HandleMark hm(thread());
37 typeArrayHandle fields(thread(), ikh()->fields());
38 int fields_length = fields->length();
39 int num_fields = fields_length / instanceKlass::next_offset;
40 objArrayHandle fields_anno(thread(), ikh()->fields_annotations());
41
42 write_u2(num_fields);
43 for (int index = 0; index < fields_length; index += instanceKlass::next_offset) {
44 AccessFlags access_flags;
45 int flags = fields->ushort_at(index + instanceKlass::access_flags_offset);
46 access_flags.set_flags(flags);
47 int name_index = fields->ushort_at(index + instanceKlass::name_index_offset);
48 int signature_index = fields->ushort_at(index + instanceKlass::signature_index_offset);
49 int initial_value_index = fields->ushort_at(index + instanceKlass::initval_index_offset);
50 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
51 int offset = ikh()->offset_from_fields( index );
52 int generic_signature_index =
53 fields->ushort_at(index + instanceKlass::generic_signature_offset);
54 typeArrayHandle anno(thread(), fields_anno.not_null() ?
55 (typeArrayOop)(fields_anno->obj_at(index / instanceKlass::next_offset)) :
56 (typeArrayOop)NULL);
57
58 // JVMSpec| field_info {
59 // JVMSpec| u2 access_flags;
60 // JVMSpec| u2 name_index;
61 // JVMSpec| u2 descriptor_index;
62 // JVMSpec| u2 attributes_count;
63 // JVMSpec| attribute_info attributes[attributes_count];
64 // JVMSpec| }
65
66 write_u2(flags & JVM_RECOGNIZED_FIELD_MODIFIERS);
67 write_u2(name_index);
68 write_u2(signature_index);
69 int attr_count = 0;
70 if (initial_value_index != 0) {
71 ++attr_count;
72 }
73 if (access_flags.is_synthetic()) {
74 // ++attr_count;
75 }
76 if (generic_signature_index != 0) {
77 ++attr_count;
78 }
79 if (anno.not_null()) {
80 ++attr_count; // has RuntimeVisibleAnnotations attribute
81 }
82
83 write_u2(attr_count);
84
85 if (initial_value_index != 0) {
86 write_attribute_name_index("ConstantValue");
87 write_u4(2); //length always 2
88 write_u2(initial_value_index);
89 }
90 if (access_flags.is_synthetic()) {
91 // write_synthetic_attribute();
92 }
93 if (generic_signature_index != 0) {
94 write_signature_attribute(generic_signature_index);
95 }
96 if (anno.not_null()) {
97 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
98 }
99 }
100 }
101
102 // Write Code attribute
103 // JVMSpec| Code_attribute {
104 // JVMSpec| u2 attribute_name_index;
105 // JVMSpec| u4 attribute_length;
106 // JVMSpec| u2 max_stack;
107 // JVMSpec| u2 max_locals;
108 // JVMSpec| u4 code_length;
109 // JVMSpec| u1 code[code_length];
110 // JVMSpec| u2 exception_table_length;
111 // JVMSpec| { u2 start_pc;
112 // JVMSpec| u2 end_pc;
113 // JVMSpec| u2 handler_pc;
114 // JVMSpec| u2 catch_type;
115 // JVMSpec| } exception_table[exception_table_length];
116 // JVMSpec| u2 attributes_count;
117 // JVMSpec| attribute_info attributes[attributes_count];
118 // JVMSpec| }
119 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {
120 constMethodHandle const_method(thread(), method->constMethod());
121 u2 line_num_cnt = 0;
122 int stackmap_len = 0;
123
124 // compute number and length of attributes -- FIXME: for now no LVT
125 int attr_count = 0;
126 int attr_size = 0;
127 if (const_method->has_linenumber_table()) {
128 line_num_cnt = line_number_table_entries(method);
129 if (line_num_cnt != 0) {
130 ++attr_count;
131 // Compute the complete size of the line number table attribute:
132 // LineNumberTable_attribute {
133 // u2 attribute_name_index;
134 // u4 attribute_length;
135 // u2 line_number_table_length;
136 // { u2 start_pc;
137 // u2 line_number;
138 // } line_number_table[line_number_table_length];
139 // }
140 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
141 }
142 }
143 if (method->has_stackmap_table()) {
144 stackmap_len = method->stackmap_data()->length();
145 if (stackmap_len != 0) {
146 ++attr_count;
147 // Compute the size of the stack map table attribute (VM stores raw):
148 // StackMapTable_attribute {
149 // u2 attribute_name_index;
150 // u4 attribute_length;
151 // u2 number_of_entries;
152 // stack_map_frame_entries[number_of_entries];
153 // }
154 attr_size += 2 + 4 + stackmap_len;
155 }
156 }
157
158 typeArrayHandle exception_table(thread(), const_method->exception_table());
159 int exception_table_length = exception_table->length();
160 int exception_table_entries = exception_table_length / 4;
161 int code_size = const_method->code_size();
162 int size =
163 2+2+4 + // max_stack, max_locals, code_length
164 code_size + // code
165 2 + // exception_table_length
166 (2+2+2+2) * exception_table_entries + // exception_table
167 2 + // attributes_count
168 attr_size; // attributes
169
170 write_attribute_name_index("Code");
171 write_u4(size);
172 write_u2(method->max_stack());
173 write_u2(method->max_locals());
174 write_u4(code_size);
175 copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
176 write_u2(exception_table_entries);
177 for (int index = 0; index < exception_table_length; ) {
178 write_u2(exception_table->int_at(index++));
179 write_u2(exception_table->int_at(index++));
180 write_u2(exception_table->int_at(index++));
181 write_u2(exception_table->int_at(index++));
182 }
183 write_u2(attr_count);
184 if (line_num_cnt != 0) {
185 write_line_number_table_attribute(method, line_num_cnt);
186 }
187 if (stackmap_len != 0) {
188 write_stackmap_table_attribute(method, stackmap_len);
189 }
190
191 // FIXME: write LVT attribute
192 }
193
194 // Write Exceptions attribute
195 // JVMSpec| Exceptions_attribute {
196 // JVMSpec| u2 attribute_name_index;
197 // JVMSpec| u4 attribute_length;
198 // JVMSpec| u2 number_of_exceptions;
199 // JVMSpec| u2 exception_index_table[number_of_exceptions];
200 // JVMSpec| }
201 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {
202 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
203 int checked_exceptions_length = const_method->checked_exceptions_length();
204 int size =
205 2 + // number_of_exceptions
206 2 * checked_exceptions_length; // exception_index_table
207
208 write_attribute_name_index("Exceptions");
209 write_u4(size);
210 write_u2(checked_exceptions_length);
211 for (int index = 0; index < checked_exceptions_length; index++) {
212 write_u2(checked_exceptions[index].class_cp_index);
213 }
214 }
215
216 // Write SourceFile attribute
217 // JVMSpec| SourceFile_attribute {
218 // JVMSpec| u2 attribute_name_index;
219 // JVMSpec| u4 attribute_length;
220 // JVMSpec| u2 sourcefile_index;
221 // JVMSpec| }
222 void JvmtiClassFileReconstituter::write_source_file_attribute() {
223 assert(ikh()->source_file_name() != NULL, "caller must check");
224
225 write_attribute_name_index("SourceFile");
226 write_u4(2); // always length 2
227 write_u2(symbol_to_cpool_index(ikh()->source_file_name()));
228 }
229
230 // Write SourceDebugExtension attribute
231 // JSR45| SourceDebugExtension_attribute {
232 // JSR45| u2 attribute_name_index;
233 // JSR45| u4 attribute_length;
234 // JSR45| u2 sourcefile_index;
235 // JSR45| }
236 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
237 assert(ikh()->source_debug_extension() != NULL, "caller must check");
238
239 write_attribute_name_index("SourceDebugExtension");
240 write_u4(2); // always length 2
241 write_u2(symbol_to_cpool_index(ikh()->source_debug_extension()));
242 }
243
244 // Write (generic) Signature attribute
245 // JVMSpec| Signature_attribute {
246 // JVMSpec| u2 attribute_name_index;
247 // JVMSpec| u4 attribute_length;
248 // JVMSpec| u2 signature_index;
249 // JVMSpec| }
250 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
251 write_attribute_name_index("Signature");
252 write_u4(2); // always length 2
253 write_u2(generic_signature_index);
254 }
255
256 // Compute the number of entries in the InnerClasses attribute
257 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
258 typeArrayOop inner_class_list = ikh()->inner_classes();
259 return (inner_class_list == NULL) ? 0 : inner_class_list->length();
260 }
261
262 // Write an annotation attribute. The VM stores them in raw form, so all we need
263 // to do is add the attrubute name and fill in the length.
264 // JSR202| *Annotations_attribute {
265 // JSR202| u2 attribute_name_index;
266 // JSR202| u4 attribute_length;
267 // JSR202| ...
268 // JSR202| }
269 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
270 typeArrayHandle annos) {
271 u4 length = annos->length();
272 write_attribute_name_index(attr_name);
273 write_u4(length);
274 memcpy(writeable_address(length), annos->byte_at_addr(0), length);
275 }
276
277
278 // Write InnerClasses attribute
279 // JVMSpec| InnerClasses_attribute {
280 // JVMSpec| u2 attribute_name_index;
281 // JVMSpec| u4 attribute_length;
282 // JVMSpec| u2 number_of_classes;
283 // JVMSpec| { u2 inner_class_info_index;
284 // JVMSpec| u2 outer_class_info_index;
285 // JVMSpec| u2 inner_name_index;
286 // JVMSpec| u2 inner_class_access_flags;
287 // JVMSpec| } classes[number_of_classes];
288 // JVMSpec| }
289 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
290 typeArrayOop inner_class_list = ikh()->inner_classes();
291 guarantee(inner_class_list != NULL && inner_class_list->length() == length,
292 "caller must check");
293 typeArrayHandle inner_class_list_h(thread(), inner_class_list);
294 assert (length % instanceKlass::inner_class_next_offset == 0, "just checking");
295 u2 entry_count = length / instanceKlass::inner_class_next_offset;
296 u4 size = 2 + entry_count * (2+2+2+2);
297
298 write_attribute_name_index("InnerClasses");
299 write_u4(size);
300 write_u2(entry_count);
301 for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) {
302 write_u2(inner_class_list_h->ushort_at(
303 i + instanceKlass::inner_class_inner_class_info_offset));
304 write_u2(inner_class_list_h->ushort_at(
305 i + instanceKlass::inner_class_outer_class_info_offset));
306 write_u2(inner_class_list_h->ushort_at(
307 i + instanceKlass::inner_class_inner_name_offset));
308 write_u2(inner_class_list_h->ushort_at(
309 i + instanceKlass::inner_class_access_flags_offset));
310 }
311 }
312
313 // Write Synthetic attribute
314 // JVMSpec| Synthetic_attribute {
315 // JVMSpec| u2 attribute_name_index;
316 // JVMSpec| u4 attribute_length;
317 // JVMSpec| }
318 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
319 write_attribute_name_index("Synthetic");
320 write_u4(0); //length always zero
321 }
322
323 // Compute size of LineNumberTable
324 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
325 // The line number table is compressed so we don't know how big it is until decompressed.
326 // Decompression is really fast so we just do it twice.
327 u2 num_entries = 0;
328 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
329 while (stream.read_pair()) {
330 num_entries++;
331 }
332 return num_entries;
333 }
334
335 // Write LineNumberTable attribute
336 // JVMSpec| LineNumberTable_attribute {
337 // JVMSpec| u2 attribute_name_index;
338 // JVMSpec| u4 attribute_length;
339 // JVMSpec| u2 line_number_table_length;
340 // JVMSpec| { u2 start_pc;
341 // JVMSpec| u2 line_number;
342 // JVMSpec| } line_number_table[line_number_table_length];
343 // JVMSpec| }
344 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
345 u2 num_entries) {
346
347 write_attribute_name_index("LineNumberTable");
348 write_u4(2 + num_entries * (2 + 2));
349 write_u2(num_entries);
350
351 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
352 while (stream.read_pair()) {
353 write_u2(stream.bci());
354 write_u2(stream.line());
355 }
356 }
357
358 // Write stack map table attribute
359 // JSR-202| StackMapTable_attribute {
360 // JSR-202| u2 attribute_name_index;
361 // JSR-202| u4 attribute_length;
362 // JSR-202| u2 number_of_entries;
363 // JSR-202| stack_map_frame_entries[number_of_entries];
364 // JSR-202| }
365 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
366 int stackmap_len) {
367
368 write_attribute_name_index("StackMapTable");
369 write_u4(stackmap_len);
370 memcpy(
371 writeable_address(stackmap_len),
372 (void*)(method->stackmap_data()->byte_at_addr(0)),
373 stackmap_len);
374 }
375
376 // Write one method_info structure
377 // JVMSpec| method_info {
378 // JVMSpec| u2 access_flags;
379 // JVMSpec| u2 name_index;
380 // JVMSpec| u2 descriptor_index;
381 // JVMSpec| u2 attributes_count;
382 // JVMSpec| attribute_info attributes[attributes_count];
383 // JVMSpec| }
384 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
385 AccessFlags access_flags = method->access_flags();
386 constMethodHandle const_method(thread(), method->constMethod());
387 u2 generic_signature_index = const_method->generic_signature_index();
388 typeArrayHandle anno(thread(), method->annotations());
389 typeArrayHandle param_anno(thread(), method->parameter_annotations());
390 typeArrayHandle default_anno(thread(), method->annotation_default());
391
392 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
393 write_u2(const_method->name_index());
394 write_u2(const_method->signature_index());
395
396 // write attributes in the same order javac does, so we can test with byte for
397 // byte comparison
398 int attr_count = 0;
399 if (const_method->code_size() != 0) {
400 ++attr_count; // has Code attribute
401 }
402 if (const_method->has_checked_exceptions()) {
403 ++attr_count; // has Exceptions attribute
404 }
405 if (default_anno.not_null()) {
406 ++attr_count; // has AnnotationDefault attribute
407 }
408 // Deprecated attribute would go here
409 if (access_flags.is_synthetic()) { // FIXME
410 // ++attr_count;
411 }
412 if (generic_signature_index != 0) {
413 ++attr_count;
414 }
415 if (anno.not_null()) {
416 ++attr_count; // has RuntimeVisibleAnnotations attribute
417 }
418 if (param_anno.not_null()) {
419 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
420 }
421
422 write_u2(attr_count);
423 if (const_method->code_size() > 0) {
424 write_code_attribute(method);
425 }
426 if (const_method->has_checked_exceptions()) {
427 write_exceptions_attribute(const_method);
428 }
429 if (default_anno.not_null()) {
430 write_annotations_attribute("AnnotationDefault", default_anno);
431 }
432 // Deprecated attribute would go here
433 if (access_flags.is_synthetic()) {
434 // write_synthetic_attribute();
435 }
436 if (generic_signature_index != 0) {
437 write_signature_attribute(generic_signature_index);
438 }
439 if (anno.not_null()) {
440 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
441 }
442 if (param_anno.not_null()) {
443 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
444 }
445 }
446
447 // Write the class attributes portion of ClassFile structure
448 // JVMSpec| u2 attributes_count;
449 // JVMSpec| attribute_info attributes[attributes_count];
450 void JvmtiClassFileReconstituter::write_class_attributes() {
451 u2 inner_classes_length = inner_classes_attribute_length();
452 symbolHandle generic_signature(thread(), ikh()->generic_signature());
453 typeArrayHandle anno(thread(), ikh()->class_annotations());
454
455 int attr_count = 0;
456 if (generic_signature() != NULL) {
457 ++attr_count;
458 }
459 if (ikh()->source_file_name() != NULL) {
460 ++attr_count;
461 }
462 if (ikh()->source_debug_extension() != NULL) {
463 ++attr_count;
464 }
465 if (inner_classes_length > 0) {
466 ++attr_count;
467 }
468 if (anno.not_null()) {
469 ++attr_count; // has RuntimeVisibleAnnotations attribute
470 }
471
472 write_u2(attr_count);
473
474 if (generic_signature() != NULL) {
475 write_signature_attribute(symbol_to_cpool_index(generic_signature()));
476 }
477 if (ikh()->source_file_name() != NULL) {
478 write_source_file_attribute();
479 }
480 if (ikh()->source_debug_extension() != NULL) {
481 write_source_debug_extension_attribute();
482 }
483 if (inner_classes_length > 0) {
484 write_inner_classes_attribute(inner_classes_length);
485 }
486 if (anno.not_null()) {
487 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
488 }
489 }
490
491 // Write the method information portion of ClassFile structure
492 // JVMSpec| u2 methods_count;
493 // JVMSpec| method_info methods[methods_count];
494 void JvmtiClassFileReconstituter::write_method_infos() {
495 HandleMark hm(thread());
496 objArrayHandle methods(thread(), ikh()->methods());
497 int num_methods = methods->length();
498
499 write_u2(num_methods);
500 if (JvmtiExport::can_maintain_original_method_order()) {
501 int index;
502 int original_index;
503 int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);
504
505 // invert the method order mapping
506 for (index = 0; index < num_methods; index++) {
507 original_index = ikh()->method_ordering()->int_at(index);
508 assert(original_index >= 0 && original_index < num_methods,
509 "invalid original method index");
510 method_order[original_index] = index;
511 }
512
513 // write in original order
514 for (original_index = 0; original_index < num_methods; original_index++) {
515 index = method_order[original_index];
516 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
517 write_method_info(method);
518 }
519 } else {
520 // method order not preserved just dump the method infos
521 for (int index = 0; index < num_methods; index++) {
522 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
523 write_method_info(method);
524 }
525 }
526 }
527
528 void JvmtiClassFileReconstituter::write_class_file_format() {
529 ReallocMark();
530
531 // JVMSpec| ClassFile {
532 // JVMSpec| u4 magic;
533 write_u4(0xCAFEBABE);
534
535 // JVMSpec| u2 minor_version;
536 // JVMSpec| u2 major_version;
537 write_u2(ikh()->minor_version());
538 u2 major = ikh()->major_version();
539 write_u2(major);
540
541 // JVMSpec| u2 constant_pool_count;
542 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
543 write_u2(cpool()->length());
544 copy_cpool_bytes(writeable_address(cpool_size()));
545
546 // JVMSpec| u2 access_flags;
547 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
548
549 // JVMSpec| u2 this_class;
550 // JVMSpec| u2 super_class;
551 write_u2(class_symbol_to_cpool_index(ikh()->name()));
552 klassOop super_class = ikh()->super();
553 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
554 class_symbol_to_cpool_index(super_class->klass_part()->name()));
555
556 // JVMSpec| u2 interfaces_count;
557 // JVMSpec| u2 interfaces[interfaces_count];
558 objArrayHandle interfaces(thread(), ikh()->local_interfaces());
559 int num_interfaces = interfaces->length();
560 write_u2(num_interfaces);
561 for (int index = 0; index < num_interfaces; index++) {
562 HandleMark hm(thread());
563 instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));
564 write_u2(class_symbol_to_cpool_index(iikh->name()));
565 }
566
567 // JVMSpec| u2 fields_count;
568 // JVMSpec| field_info fields[fields_count];
569 write_field_infos();
570
571 // JVMSpec| u2 methods_count;
572 // JVMSpec| method_info methods[methods_count];
573 write_method_infos();
574
575 // JVMSpec| u2 attributes_count;
576 // JVMSpec| attribute_info attributes[attributes_count];
577 // JVMSpec| } /* end ClassFile 8?
578 write_class_attributes();
579 }
580
581 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
582 size_t used_size = _buffer_ptr - _buffer;
583 if (size + used_size >= _buffer_size) {
584 // compute the new buffer size: must be at least twice as big as before
585 // plus whatever new is being used; then convert to nice clean block boundary
586 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
587 * initial_buffer_size;
588
589 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
590 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
591 _buffer_size = new_buffer_size;
592 _buffer_ptr = _buffer + used_size;
593 }
594 u1* ret_ptr = _buffer_ptr;
595 _buffer_ptr += size;
596 return ret_ptr;
597 }
598
599 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
600 unsigned int hash_ignored;
601 symbolOop sym = SymbolTable::lookup_only(name, (int)strlen(name), hash_ignored);
602 assert(sym != NULL, "attribute name symbol not found");
603 u2 attr_name_index = symbol_to_cpool_index(sym);
604 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
605 write_u2(attr_name_index);
606 }
607
608 void JvmtiClassFileReconstituter::write_u1(u1 x) {
609 *writeable_address(1) = x;
610 }
611
612 void JvmtiClassFileReconstituter::write_u2(u2 x) {
613 Bytes::put_Java_u2(writeable_address(2), x);
614 }
615
616 void JvmtiClassFileReconstituter::write_u4(u4 x) {
617 Bytes::put_Java_u4(writeable_address(4), x);
618 }
619
620 void JvmtiClassFileReconstituter::write_u8(u8 x) {
621 Bytes::put_Java_u8(writeable_address(8), x);
622 }
623
624 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
625 unsigned char* bytecodes) {
626 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
627 // and the breakpoint bytecode are converted to their original bytecodes.
628
629 BytecodeStream bs(mh);
630
631 unsigned char* p = bytecodes;
632 Bytecodes::Code code;
633 bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();
634
635 while ((code = bs.next()) >= 0) {
636 assert(Bytecodes::is_java_code(code), "sanity check");
637 assert(code != Bytecodes::_breakpoint, "sanity check");
638
639 // length of bytecode (mnemonic + operands)
640 address bcp = bs.bcp();
641 int len = bs.next_bcp() - bcp;
642 assert(len > 0, "length must be > 0");
643
644 // copy the bytecodes
645 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
646 if (len > 1) {
647 memcpy(p+1, bcp+1, len-1);
648 }
649
650 // During linking the get/put and invoke instructions are rewritten
651 // with an index into the constant pool cache. The original constant
652 // pool index must be returned to caller. Rewrite the index.
653 if (is_rewritten && len >= 3) {
654 switch (code) {
655 case Bytecodes::_getstatic : // fall through
656 case Bytecodes::_putstatic : // fall through
657 case Bytecodes::_getfield : // fall through
658 case Bytecodes::_putfield : // fall through
659 case Bytecodes::_invokevirtual : // fall through
660 case Bytecodes::_invokespecial : // fall through
661 case Bytecodes::_invokestatic : // fall through
662 case Bytecodes::_invokeinterface :
663 assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5),
664 "sanity check");
665 // cache cannot be pre-fetched since some classes won't have it yet
666 ConstantPoolCacheEntry* entry =
667 mh->constants()->cache()->entry_at(Bytes::get_native_u2(bcp+1));
668 int i = entry->constant_pool_index();
669 assert(i < mh->constants()->length(), "sanity check");
670 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
671 break;
672 }
673 }
674
675 p += len;
676 }
677 }