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