1 /*
2 * Copyright (c) 2005, 2010, 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 "prims/jvmtiClassFileReconstituter.hpp"
29 #include "runtime/signature.hpp"
30 #ifdef TARGET_ARCH_x86
31 # include "bytes_x86.hpp"
32 #endif
33 #ifdef TARGET_ARCH_sparc
34 # include "bytes_sparc.hpp"
35 #endif
36 #ifdef TARGET_ARCH_zero
37 # include "bytes_zero.hpp"
38 #endif
39 // FIXME: add Deprecated, LVT, LVTT attributes
40 // FIXME: fix Synthetic attribute
41 // FIXME: per Serguei, add error return handling for constantPoolOopDesc::copy_cpool_bytes()
42
43
44 // Write the field information portion of ClassFile structure
45 // JVMSpec| u2 fields_count;
46 // JVMSpec| field_info fields[fields_count];
47 void JvmtiClassFileReconstituter::write_field_infos() {
48 HandleMark hm(thread());
49 typeArrayHandle fields(thread(), ikh()->fields());
50 int fields_length = fields->length();
51 int num_fields = fields_length / instanceKlass::next_offset;
52 objArrayHandle fields_anno(thread(), ikh()->fields_annotations());
53
54 write_u2(num_fields);
55 for (int index = 0; index < fields_length; index += instanceKlass::next_offset) {
56 AccessFlags access_flags;
57 int flags = fields->ushort_at(index + instanceKlass::access_flags_offset);
58 access_flags.set_flags(flags);
59 int name_index = fields->ushort_at(index + instanceKlass::name_index_offset);
60 int signature_index = fields->ushort_at(index + instanceKlass::signature_index_offset);
61 int initial_value_index = fields->ushort_at(index + instanceKlass::initval_index_offset);
62 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
63 int offset = ikh()->offset_from_fields( index );
64 int generic_signature_index =
65 fields->ushort_at(index + instanceKlass::generic_signature_offset);
66 typeArrayHandle anno(thread(), fields_anno.not_null() ?
67 (typeArrayOop)(fields_anno->obj_at(index / instanceKlass::next_offset)) :
68 (typeArrayOop)NULL);
69
70 // JVMSpec| field_info {
71 // JVMSpec| u2 access_flags;
72 // JVMSpec| u2 name_index;
73 // JVMSpec| u2 descriptor_index;
74 // JVMSpec| u2 attributes_count;
75 // JVMSpec| attribute_info attributes[attributes_count];
76 // JVMSpec| }
77
78 write_u2(flags & JVM_RECOGNIZED_FIELD_MODIFIERS);
79 write_u2(name_index);
80 write_u2(signature_index);
81 int attr_count = 0;
82 if (initial_value_index != 0) {
83 ++attr_count;
84 }
85 if (access_flags.is_synthetic()) {
86 // ++attr_count;
87 }
88 if (generic_signature_index != 0) {
89 ++attr_count;
90 }
91 if (anno.not_null()) {
92 ++attr_count; // has RuntimeVisibleAnnotations attribute
93 }
94
95 write_u2(attr_count);
96
97 if (initial_value_index != 0) {
98 write_attribute_name_index("ConstantValue");
99 write_u4(2); //length always 2
100 write_u2(initial_value_index);
101 }
102 if (access_flags.is_synthetic()) {
103 // write_synthetic_attribute();
104 }
105 if (generic_signature_index != 0) {
106 write_signature_attribute(generic_signature_index);
107 }
108 if (anno.not_null()) {
109 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
110 }
111 }
112 }
113
114 // Write Code attribute
115 // JVMSpec| Code_attribute {
116 // JVMSpec| u2 attribute_name_index;
117 // JVMSpec| u4 attribute_length;
118 // JVMSpec| u2 max_stack;
119 // JVMSpec| u2 max_locals;
120 // JVMSpec| u4 code_length;
121 // JVMSpec| u1 code[code_length];
122 // JVMSpec| u2 exception_table_length;
123 // JVMSpec| { u2 start_pc;
124 // JVMSpec| u2 end_pc;
125 // JVMSpec| u2 handler_pc;
126 // JVMSpec| u2 catch_type;
127 // JVMSpec| } exception_table[exception_table_length];
128 // JVMSpec| u2 attributes_count;
129 // JVMSpec| attribute_info attributes[attributes_count];
130 // JVMSpec| }
131 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {
132 constMethodHandle const_method(thread(), method->constMethod());
133 u2 line_num_cnt = 0;
134 int stackmap_len = 0;
135
136 // compute number and length of attributes -- FIXME: for now no LVT
137 int attr_count = 0;
138 int attr_size = 0;
139 if (const_method->has_linenumber_table()) {
140 line_num_cnt = line_number_table_entries(method);
141 if (line_num_cnt != 0) {
142 ++attr_count;
143 // Compute the complete size of the line number table attribute:
144 // LineNumberTable_attribute {
145 // u2 attribute_name_index;
146 // u4 attribute_length;
147 // u2 line_number_table_length;
148 // { u2 start_pc;
149 // u2 line_number;
150 // } line_number_table[line_number_table_length];
151 // }
152 attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
153 }
154 }
155 if (method->has_stackmap_table()) {
156 stackmap_len = method->stackmap_data()->length();
157 if (stackmap_len != 0) {
158 ++attr_count;
159 // Compute the size of the stack map table attribute (VM stores raw):
160 // StackMapTable_attribute {
161 // u2 attribute_name_index;
162 // u4 attribute_length;
163 // u2 number_of_entries;
164 // stack_map_frame_entries[number_of_entries];
165 // }
166 attr_size += 2 + 4 + stackmap_len;
167 }
168 }
169
170 typeArrayHandle exception_table(thread(), const_method->exception_table());
171 int exception_table_length = exception_table->length();
172 int exception_table_entries = exception_table_length / 4;
173 int code_size = const_method->code_size();
174 int size =
175 2+2+4 + // max_stack, max_locals, code_length
176 code_size + // code
177 2 + // exception_table_length
178 (2+2+2+2) * exception_table_entries + // exception_table
179 2 + // attributes_count
180 attr_size; // attributes
181
182 write_attribute_name_index("Code");
183 write_u4(size);
184 write_u2(method->max_stack());
185 write_u2(method->max_locals());
186 write_u4(code_size);
187 copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
188 write_u2(exception_table_entries);
189 for (int index = 0; index < exception_table_length; ) {
190 write_u2(exception_table->int_at(index++));
191 write_u2(exception_table->int_at(index++));
192 write_u2(exception_table->int_at(index++));
193 write_u2(exception_table->int_at(index++));
194 }
195 write_u2(attr_count);
196 if (line_num_cnt != 0) {
197 write_line_number_table_attribute(method, line_num_cnt);
198 }
199 if (stackmap_len != 0) {
200 write_stackmap_table_attribute(method, stackmap_len);
201 }
202
203 // FIXME: write LVT attribute
204 }
205
206 // Write Exceptions attribute
207 // JVMSpec| Exceptions_attribute {
208 // JVMSpec| u2 attribute_name_index;
209 // JVMSpec| u4 attribute_length;
210 // JVMSpec| u2 number_of_exceptions;
211 // JVMSpec| u2 exception_index_table[number_of_exceptions];
212 // JVMSpec| }
213 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {
214 CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
215 int checked_exceptions_length = const_method->checked_exceptions_length();
216 int size =
217 2 + // number_of_exceptions
218 2 * checked_exceptions_length; // exception_index_table
219
220 write_attribute_name_index("Exceptions");
221 write_u4(size);
222 write_u2(checked_exceptions_length);
223 for (int index = 0; index < checked_exceptions_length; index++) {
224 write_u2(checked_exceptions[index].class_cp_index);
225 }
226 }
227
228 // Write SourceFile attribute
229 // JVMSpec| SourceFile_attribute {
230 // JVMSpec| u2 attribute_name_index;
231 // JVMSpec| u4 attribute_length;
232 // JVMSpec| u2 sourcefile_index;
233 // JVMSpec| }
234 void JvmtiClassFileReconstituter::write_source_file_attribute() {
235 assert(ikh()->source_file_name() != NULL, "caller must check");
236
237 write_attribute_name_index("SourceFile");
238 write_u4(2); // always length 2
239 write_u2(symbol_to_cpool_index(ikh()->source_file_name()));
240 }
241
242 // Write SourceDebugExtension attribute
243 // JSR45| SourceDebugExtension_attribute {
244 // JSR45| u2 attribute_name_index;
245 // JSR45| u4 attribute_length;
246 // JSR45| u2 sourcefile_index;
247 // JSR45| }
248 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
249 assert(ikh()->source_debug_extension() != NULL, "caller must check");
250
251 write_attribute_name_index("SourceDebugExtension");
252 write_u4(2); // always length 2
253 write_u2(symbol_to_cpool_index(ikh()->source_debug_extension()));
254 }
255
256 // Write (generic) Signature attribute
257 // JVMSpec| Signature_attribute {
258 // JVMSpec| u2 attribute_name_index;
259 // JVMSpec| u4 attribute_length;
260 // JVMSpec| u2 signature_index;
261 // JVMSpec| }
262 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
263 write_attribute_name_index("Signature");
264 write_u4(2); // always length 2
265 write_u2(generic_signature_index);
266 }
267
268 // Compute the number of entries in the InnerClasses attribute
269 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
270 typeArrayOop inner_class_list = ikh()->inner_classes();
271 return (inner_class_list == NULL) ? 0 : inner_class_list->length();
272 }
273
274 // Write an annotation attribute. The VM stores them in raw form, so all we need
275 // to do is add the attrubute name and fill in the length.
276 // JSR202| *Annotations_attribute {
277 // JSR202| u2 attribute_name_index;
278 // JSR202| u4 attribute_length;
279 // JSR202| ...
280 // JSR202| }
281 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
282 typeArrayHandle annos) {
283 u4 length = annos->length();
284 write_attribute_name_index(attr_name);
285 write_u4(length);
286 memcpy(writeable_address(length), annos->byte_at_addr(0), length);
287 }
288
289
290 // Write InnerClasses attribute
291 // JVMSpec| InnerClasses_attribute {
292 // JVMSpec| u2 attribute_name_index;
293 // JVMSpec| u4 attribute_length;
294 // JVMSpec| u2 number_of_classes;
295 // JVMSpec| { u2 inner_class_info_index;
296 // JVMSpec| u2 outer_class_info_index;
297 // JVMSpec| u2 inner_name_index;
298 // JVMSpec| u2 inner_class_access_flags;
299 // JVMSpec| } classes[number_of_classes];
300 // JVMSpec| }
301 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
302 typeArrayOop inner_class_list = ikh()->inner_classes();
303 guarantee(inner_class_list != NULL && inner_class_list->length() == length,
304 "caller must check");
305 typeArrayHandle inner_class_list_h(thread(), inner_class_list);
306 assert (length % instanceKlass::inner_class_next_offset == 0, "just checking");
307 u2 entry_count = length / instanceKlass::inner_class_next_offset;
308 u4 size = 2 + entry_count * (2+2+2+2);
309
310 write_attribute_name_index("InnerClasses");
311 write_u4(size);
312 write_u2(entry_count);
313 for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) {
314 write_u2(inner_class_list_h->ushort_at(
315 i + instanceKlass::inner_class_inner_class_info_offset));
316 write_u2(inner_class_list_h->ushort_at(
317 i + instanceKlass::inner_class_outer_class_info_offset));
318 write_u2(inner_class_list_h->ushort_at(
319 i + instanceKlass::inner_class_inner_name_offset));
320 write_u2(inner_class_list_h->ushort_at(
321 i + instanceKlass::inner_class_access_flags_offset));
322 }
323 }
324
325 // Write Synthetic attribute
326 // JVMSpec| Synthetic_attribute {
327 // JVMSpec| u2 attribute_name_index;
328 // JVMSpec| u4 attribute_length;
329 // JVMSpec| }
330 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
331 write_attribute_name_index("Synthetic");
332 write_u4(0); //length always zero
333 }
334
335 // Compute size of LineNumberTable
336 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
337 // The line number table is compressed so we don't know how big it is until decompressed.
338 // Decompression is really fast so we just do it twice.
339 u2 num_entries = 0;
340 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
341 while (stream.read_pair()) {
342 num_entries++;
343 }
344 return num_entries;
345 }
346
347 // Write LineNumberTable attribute
348 // JVMSpec| LineNumberTable_attribute {
349 // JVMSpec| u2 attribute_name_index;
350 // JVMSpec| u4 attribute_length;
351 // JVMSpec| u2 line_number_table_length;
352 // JVMSpec| { u2 start_pc;
353 // JVMSpec| u2 line_number;
354 // JVMSpec| } line_number_table[line_number_table_length];
355 // JVMSpec| }
356 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
357 u2 num_entries) {
358
359 write_attribute_name_index("LineNumberTable");
360 write_u4(2 + num_entries * (2 + 2));
361 write_u2(num_entries);
362
363 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
364 while (stream.read_pair()) {
365 write_u2(stream.bci());
366 write_u2(stream.line());
367 }
368 }
369
370 // Write stack map table attribute
371 // JSR-202| StackMapTable_attribute {
372 // JSR-202| u2 attribute_name_index;
373 // JSR-202| u4 attribute_length;
374 // JSR-202| u2 number_of_entries;
375 // JSR-202| stack_map_frame_entries[number_of_entries];
376 // JSR-202| }
377 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
378 int stackmap_len) {
379
380 write_attribute_name_index("StackMapTable");
381 write_u4(stackmap_len);
382 memcpy(
383 writeable_address(stackmap_len),
384 (void*)(method->stackmap_data()->byte_at_addr(0)),
385 stackmap_len);
386 }
387
388 // Write one method_info structure
389 // JVMSpec| method_info {
390 // JVMSpec| u2 access_flags;
391 // JVMSpec| u2 name_index;
392 // JVMSpec| u2 descriptor_index;
393 // JVMSpec| u2 attributes_count;
394 // JVMSpec| attribute_info attributes[attributes_count];
395 // JVMSpec| }
396 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
397 AccessFlags access_flags = method->access_flags();
398 constMethodHandle const_method(thread(), method->constMethod());
399 u2 generic_signature_index = const_method->generic_signature_index();
400 typeArrayHandle anno(thread(), method->annotations());
401 typeArrayHandle param_anno(thread(), method->parameter_annotations());
402 typeArrayHandle default_anno(thread(), method->annotation_default());
403
404 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
405 write_u2(const_method->name_index());
406 write_u2(const_method->signature_index());
407
408 // write attributes in the same order javac does, so we can test with byte for
409 // byte comparison
410 int attr_count = 0;
411 if (const_method->code_size() != 0) {
412 ++attr_count; // has Code attribute
413 }
414 if (const_method->has_checked_exceptions()) {
415 ++attr_count; // has Exceptions attribute
416 }
417 if (default_anno.not_null()) {
418 ++attr_count; // has AnnotationDefault attribute
419 }
420 // Deprecated attribute would go here
421 if (access_flags.is_synthetic()) { // FIXME
422 // ++attr_count;
423 }
424 if (generic_signature_index != 0) {
425 ++attr_count;
426 }
427 if (anno.not_null()) {
428 ++attr_count; // has RuntimeVisibleAnnotations attribute
429 }
430 if (param_anno.not_null()) {
431 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
432 }
433
434 write_u2(attr_count);
435 if (const_method->code_size() > 0) {
436 write_code_attribute(method);
437 }
438 if (const_method->has_checked_exceptions()) {
439 write_exceptions_attribute(const_method);
440 }
441 if (default_anno.not_null()) {
442 write_annotations_attribute("AnnotationDefault", default_anno);
443 }
444 // Deprecated attribute would go here
445 if (access_flags.is_synthetic()) {
446 // write_synthetic_attribute();
447 }
448 if (generic_signature_index != 0) {
449 write_signature_attribute(generic_signature_index);
450 }
451 if (anno.not_null()) {
452 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
453 }
454 if (param_anno.not_null()) {
455 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
456 }
457 }
458
459 // Write the class attributes portion of ClassFile structure
460 // JVMSpec| u2 attributes_count;
461 // JVMSpec| attribute_info attributes[attributes_count];
462 void JvmtiClassFileReconstituter::write_class_attributes() {
463 u2 inner_classes_length = inner_classes_attribute_length();
464 symbolHandle generic_signature(thread(), ikh()->generic_signature());
465 typeArrayHandle anno(thread(), ikh()->class_annotations());
466
467 int attr_count = 0;
468 if (generic_signature() != NULL) {
469 ++attr_count;
470 }
471 if (ikh()->source_file_name() != NULL) {
472 ++attr_count;
473 }
474 if (ikh()->source_debug_extension() != NULL) {
475 ++attr_count;
476 }
477 if (inner_classes_length > 0) {
478 ++attr_count;
479 }
480 if (anno.not_null()) {
481 ++attr_count; // has RuntimeVisibleAnnotations attribute
482 }
483
484 write_u2(attr_count);
485
486 if (generic_signature() != NULL) {
487 write_signature_attribute(symbol_to_cpool_index(generic_signature()));
488 }
489 if (ikh()->source_file_name() != NULL) {
490 write_source_file_attribute();
491 }
492 if (ikh()->source_debug_extension() != NULL) {
493 write_source_debug_extension_attribute();
494 }
495 if (inner_classes_length > 0) {
496 write_inner_classes_attribute(inner_classes_length);
497 }
498 if (anno.not_null()) {
499 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
500 }
501 }
502
503 // Write the method information portion of ClassFile structure
504 // JVMSpec| u2 methods_count;
505 // JVMSpec| method_info methods[methods_count];
506 void JvmtiClassFileReconstituter::write_method_infos() {
507 HandleMark hm(thread());
508 objArrayHandle methods(thread(), ikh()->methods());
509 int num_methods = methods->length();
510
511 write_u2(num_methods);
512 if (JvmtiExport::can_maintain_original_method_order()) {
513 int index;
514 int original_index;
515 int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);
516
517 // invert the method order mapping
518 for (index = 0; index < num_methods; index++) {
519 original_index = ikh()->method_ordering()->int_at(index);
520 assert(original_index >= 0 && original_index < num_methods,
521 "invalid original method index");
522 method_order[original_index] = index;
523 }
524
525 // write in original order
526 for (original_index = 0; original_index < num_methods; original_index++) {
527 index = method_order[original_index];
528 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
529 write_method_info(method);
530 }
531 } else {
532 // method order not preserved just dump the method infos
533 for (int index = 0; index < num_methods; index++) {
534 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
535 write_method_info(method);
536 }
537 }
538 }
539
540 void JvmtiClassFileReconstituter::write_class_file_format() {
541 ReallocMark();
542
543 // JVMSpec| ClassFile {
544 // JVMSpec| u4 magic;
545 write_u4(0xCAFEBABE);
546
547 // JVMSpec| u2 minor_version;
548 // JVMSpec| u2 major_version;
549 write_u2(ikh()->minor_version());
550 u2 major = ikh()->major_version();
551 write_u2(major);
552
553 // JVMSpec| u2 constant_pool_count;
554 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
555 write_u2(cpool()->length());
556 copy_cpool_bytes(writeable_address(cpool_size()));
557
558 // JVMSpec| u2 access_flags;
559 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
560
561 // JVMSpec| u2 this_class;
562 // JVMSpec| u2 super_class;
563 write_u2(class_symbol_to_cpool_index(ikh()->name()));
564 klassOop super_class = ikh()->super();
565 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
566 class_symbol_to_cpool_index(super_class->klass_part()->name()));
567
568 // JVMSpec| u2 interfaces_count;
569 // JVMSpec| u2 interfaces[interfaces_count];
570 objArrayHandle interfaces(thread(), ikh()->local_interfaces());
571 int num_interfaces = interfaces->length();
572 write_u2(num_interfaces);
573 for (int index = 0; index < num_interfaces; index++) {
574 HandleMark hm(thread());
575 instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));
576 write_u2(class_symbol_to_cpool_index(iikh->name()));
577 }
578
579 // JVMSpec| u2 fields_count;
580 // JVMSpec| field_info fields[fields_count];
581 write_field_infos();
582
583 // JVMSpec| u2 methods_count;
584 // JVMSpec| method_info methods[methods_count];
585 write_method_infos();
586
587 // JVMSpec| u2 attributes_count;
588 // JVMSpec| attribute_info attributes[attributes_count];
589 // JVMSpec| } /* end ClassFile 8?
590 write_class_attributes();
591 }
592
593 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
594 size_t used_size = _buffer_ptr - _buffer;
595 if (size + used_size >= _buffer_size) {
596 // compute the new buffer size: must be at least twice as big as before
597 // plus whatever new is being used; then convert to nice clean block boundary
598 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
599 * initial_buffer_size;
600
601 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
602 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
603 _buffer_size = new_buffer_size;
604 _buffer_ptr = _buffer + used_size;
605 }
606 u1* ret_ptr = _buffer_ptr;
607 _buffer_ptr += size;
608 return ret_ptr;
609 }
610
611 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
612 unsigned int hash_ignored;
613 symbolOop sym = SymbolTable::lookup_only(name, (int)strlen(name), hash_ignored);
614 assert(sym != NULL, "attribute name symbol not found");
615 u2 attr_name_index = symbol_to_cpool_index(sym);
616 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
617 write_u2(attr_name_index);
618 }
619
620 void JvmtiClassFileReconstituter::write_u1(u1 x) {
621 *writeable_address(1) = x;
622 }
623
624 void JvmtiClassFileReconstituter::write_u2(u2 x) {
625 Bytes::put_Java_u2(writeable_address(2), x);
626 }
627
628 void JvmtiClassFileReconstituter::write_u4(u4 x) {
629 Bytes::put_Java_u4(writeable_address(4), x);
630 }
631
632 void JvmtiClassFileReconstituter::write_u8(u8 x) {
633 Bytes::put_Java_u8(writeable_address(8), x);
634 }
635
636 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
637 unsigned char* bytecodes) {
638 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
639 // and the breakpoint bytecode are converted to their original bytecodes.
640
641 BytecodeStream bs(mh);
642
643 unsigned char* p = bytecodes;
644 Bytecodes::Code code;
645 bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();
646
647 while ((code = bs.next()) >= 0) {
648 assert(Bytecodes::is_java_code(code), "sanity check");
649 assert(code != Bytecodes::_breakpoint, "sanity check");
650
651 // length of bytecode (mnemonic + operands)
652 address bcp = bs.bcp();
653 int len = bs.instruction_size();
654 assert(len > 0, "length must be > 0");
655
656 // copy the bytecodes
657 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
658 if (len > 1) {
659 memcpy(p+1, bcp+1, len-1);
660 }
661
662 // During linking the get/put and invoke instructions are rewritten
663 // with an index into the constant pool cache. The original constant
664 // pool index must be returned to caller. Rewrite the index.
665 if (is_rewritten && len >= 3) {
666 switch (code) {
667 case Bytecodes::_getstatic : // fall through
668 case Bytecodes::_putstatic : // fall through
669 case Bytecodes::_getfield : // fall through
670 case Bytecodes::_putfield : // fall through
671 case Bytecodes::_invokevirtual : // fall through
672 case Bytecodes::_invokespecial : // fall through
673 case Bytecodes::_invokestatic : // fall through
674 case Bytecodes::_invokedynamic : // fall through
675 case Bytecodes::_invokeinterface :
676 assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5),
677 "sanity check");
678 int cpci = Bytes::get_native_u2(bcp+1);
679 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);
680 if (is_invokedynamic)
681 cpci = Bytes::get_native_u4(bcp+1);
682 // cache cannot be pre-fetched since some classes won't have it yet
683 ConstantPoolCacheEntry* entry =
684 mh->constants()->cache()->main_entry_at(cpci);
685 int i = entry->constant_pool_index();
686 assert(i < mh->constants()->length(), "sanity check");
687 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
688 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
689 break;
690 }
691 }
692
693 p += len;
694 }
695 }