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src/share/vm/prims/jvmtiClassFileReconstituter.cpp@04ade88d9712
src/share/vm/prims/jvmtiClassFileReconstituter.cpp
Mon, 09 Jul 2012 01:28:37 -0700
- author
- fparain
- date
- Mon, 09 Jul 2012 01:28:37 -0700
- changeset 3906
- 04ade88d9712
- parent 3670
- f7c4174b33ba
- child 3921
- e74da3c2b827
- permissions
- -rw-r--r--
6294277: java -Xdebug crashes on SourceDebugExtension attribute larger than 64K
Reviewed-by: sspitsyn, dholmes, coleenp, kamg
1 /*
2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "interpreter/bytecodeStream.hpp"
28 #include "oops/fieldStreams.hpp"
29 #include "prims/jvmtiClassFileReconstituter.hpp"
30 #include "runtime/signature.hpp"
31 #ifdef TARGET_ARCH_x86
32 # include "bytes_x86.hpp"
33 #endif
34 #ifdef TARGET_ARCH_sparc
35 # include "bytes_sparc.hpp"
36 #endif
37 #ifdef TARGET_ARCH_zero
38 # include "bytes_zero.hpp"
39 #endif
40 #ifdef TARGET_ARCH_arm
41 # include "bytes_arm.hpp"
42 #endif
43 #ifdef TARGET_ARCH_ppc
44 # include "bytes_ppc.hpp"
45 #endif
46 // FIXME: add Deprecated, LVTT attributes
47 // FIXME: fix Synthetic attribute
48 // FIXME: per Serguei, add error return handling for constantPoolOopDesc::copy_cpool_bytes()
51 // Write the field information portion of ClassFile structure
52 // JVMSpec| u2 fields_count;
53 // JVMSpec| field_info fields[fields_count];
54 void JvmtiClassFileReconstituter::write_field_infos() {
55 HandleMark hm(thread());
56 objArrayHandle fields_anno(thread(), ikh()->fields_annotations());
58 // Compute the real number of Java fields
59 int java_fields = ikh()->java_fields_count();
61 write_u2(java_fields);
62 for (JavaFieldStream fs(ikh()); !fs.done(); fs.next()) {
63 AccessFlags access_flags = fs.access_flags();
64 int name_index = fs.name_index();
65 int signature_index = fs.signature_index();
66 int initial_value_index = fs.initval_index();
67 guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
68 // int offset = ikh()->field_offset( index );
69 int generic_signature_index = fs.generic_signature_index();
70 typeArrayHandle anno(thread(), fields_anno.not_null() ?
71 (typeArrayOop)(fields_anno->obj_at(fs.index())) :
72 (typeArrayOop)NULL);
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| }
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 }
99 write_u2(attr_count);
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 }
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;
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 }
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
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 }
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
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 }
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");
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 }
267 // Write SourceDebugExtension attribute
268 // JSR45| SourceDebugExtension_attribute {
269 // JSR45| u2 attribute_name_index;
270 // JSR45| u4 attribute_length;
271 // JSR45| u1 debug_extension[attribute_length];
272 // JSR45| }
273 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
274 assert(ikh()->source_debug_extension() != NULL, "caller must check");
276 write_attribute_name_index("SourceDebugExtension");
277 int len = (int)strlen(ikh()->source_debug_extension());
278 write_u4(len);
279 u1* ext = (u1*)ikh()->source_debug_extension();
280 for (int i=0; i<len; i++) {
281 write_u1(ext[i]);
282 }
283 }
285 // Write (generic) Signature attribute
286 // JVMSpec| Signature_attribute {
287 // JVMSpec| u2 attribute_name_index;
288 // JVMSpec| u4 attribute_length;
289 // JVMSpec| u2 signature_index;
290 // JVMSpec| }
291 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
292 write_attribute_name_index("Signature");
293 write_u4(2); // always length 2
294 write_u2(generic_signature_index);
295 }
297 // Compute the number of entries in the InnerClasses attribute
298 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
299 InnerClassesIterator iter(ikh());
300 return iter.length();
301 }
303 // Write an annotation attribute. The VM stores them in raw form, so all we need
304 // to do is add the attrubute name and fill in the length.
305 // JSR202| *Annotations_attribute {
306 // JSR202| u2 attribute_name_index;
307 // JSR202| u4 attribute_length;
308 // JSR202| ...
309 // JSR202| }
310 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
311 typeArrayHandle annos) {
312 u4 length = annos->length();
313 write_attribute_name_index(attr_name);
314 write_u4(length);
315 memcpy(writeable_address(length), annos->byte_at_addr(0), length);
316 }
319 // Write InnerClasses attribute
320 // JVMSpec| InnerClasses_attribute {
321 // JVMSpec| u2 attribute_name_index;
322 // JVMSpec| u4 attribute_length;
323 // JVMSpec| u2 number_of_classes;
324 // JVMSpec| { u2 inner_class_info_index;
325 // JVMSpec| u2 outer_class_info_index;
326 // JVMSpec| u2 inner_name_index;
327 // JVMSpec| u2 inner_class_access_flags;
328 // JVMSpec| } classes[number_of_classes];
329 // JVMSpec| }
330 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
331 InnerClassesIterator iter(ikh());
332 guarantee(iter.length() != 0 && iter.length() == length,
333 "caller must check");
334 u2 entry_count = length / instanceKlass::inner_class_next_offset;
335 u4 size = 2 + entry_count * (2+2+2+2);
337 write_attribute_name_index("InnerClasses");
338 write_u4(size);
339 write_u2(entry_count);
340 for (; !iter.done(); iter.next()) {
341 write_u2(iter.inner_class_info_index());
342 write_u2(iter.outer_class_info_index());
343 write_u2(iter.inner_name_index());
344 write_u2(iter.inner_access_flags());
345 }
346 }
348 // Write Synthetic attribute
349 // JVMSpec| Synthetic_attribute {
350 // JVMSpec| u2 attribute_name_index;
351 // JVMSpec| u4 attribute_length;
352 // JVMSpec| }
353 void JvmtiClassFileReconstituter::write_synthetic_attribute() {
354 write_attribute_name_index("Synthetic");
355 write_u4(0); //length always zero
356 }
358 // Compute size of LineNumberTable
359 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
360 // The line number table is compressed so we don't know how big it is until decompressed.
361 // Decompression is really fast so we just do it twice.
362 u2 num_entries = 0;
363 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
364 while (stream.read_pair()) {
365 num_entries++;
366 }
367 return num_entries;
368 }
370 // Write LineNumberTable attribute
371 // JVMSpec| LineNumberTable_attribute {
372 // JVMSpec| u2 attribute_name_index;
373 // JVMSpec| u4 attribute_length;
374 // JVMSpec| u2 line_number_table_length;
375 // JVMSpec| { u2 start_pc;
376 // JVMSpec| u2 line_number;
377 // JVMSpec| } line_number_table[line_number_table_length];
378 // JVMSpec| }
379 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
380 u2 num_entries) {
382 write_attribute_name_index("LineNumberTable");
383 write_u4(2 + num_entries * (2 + 2));
384 write_u2(num_entries);
386 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
387 while (stream.read_pair()) {
388 write_u2(stream.bci());
389 write_u2(stream.line());
390 }
391 }
393 // Write LineNumberTable attribute
394 // JVMSpec| LocalVariableTable_attribute {
395 // JVMSpec| u2 attribute_name_index;
396 // JVMSpec| u4 attribute_length;
397 // JVMSpec| u2 local_variable_table_length;
398 // JVMSpec| { u2 start_pc;
399 // JVMSpec| u2 length;
400 // JVMSpec| u2 name_index;
401 // JVMSpec| u2 descriptor_index;
402 // JVMSpec| u2 index;
403 // JVMSpec| } local_variable_table[local_variable_table_length];
404 // JVMSpec| }
405 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) {
406 write_attribute_name_index("LocalVariableTable");
407 write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));
408 write_u2(num_entries);
410 assert(method->localvariable_table_length() == num_entries, "just checking");
412 LocalVariableTableElement *elem = method->localvariable_table_start();
413 for (int j=0; j<method->localvariable_table_length(); j++) {
414 write_u2(elem->start_bci);
415 write_u2(elem->length);
416 write_u2(elem->name_cp_index);
417 write_u2(elem->descriptor_cp_index);
418 write_u2(elem->slot);
419 elem++;
420 }
421 }
423 // Write stack map table attribute
424 // JSR-202| StackMapTable_attribute {
425 // JSR-202| u2 attribute_name_index;
426 // JSR-202| u4 attribute_length;
427 // JSR-202| u2 number_of_entries;
428 // JSR-202| stack_map_frame_entries[number_of_entries];
429 // JSR-202| }
430 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
431 int stackmap_len) {
433 write_attribute_name_index("StackMapTable");
434 write_u4(stackmap_len);
435 memcpy(
436 writeable_address(stackmap_len),
437 (void*)(method->stackmap_data()->byte_at_addr(0)),
438 stackmap_len);
439 }
441 // Write one method_info structure
442 // JVMSpec| method_info {
443 // JVMSpec| u2 access_flags;
444 // JVMSpec| u2 name_index;
445 // JVMSpec| u2 descriptor_index;
446 // JVMSpec| u2 attributes_count;
447 // JVMSpec| attribute_info attributes[attributes_count];
448 // JVMSpec| }
449 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
450 AccessFlags access_flags = method->access_flags();
451 constMethodHandle const_method(thread(), method->constMethod());
452 u2 generic_signature_index = const_method->generic_signature_index();
453 typeArrayHandle anno(thread(), method->annotations());
454 typeArrayHandle param_anno(thread(), method->parameter_annotations());
455 typeArrayHandle default_anno(thread(), method->annotation_default());
457 write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
458 write_u2(const_method->name_index());
459 write_u2(const_method->signature_index());
461 // write attributes in the same order javac does, so we can test with byte for
462 // byte comparison
463 int attr_count = 0;
464 if (const_method->code_size() != 0) {
465 ++attr_count; // has Code attribute
466 }
467 if (const_method->has_checked_exceptions()) {
468 ++attr_count; // has Exceptions attribute
469 }
470 if (default_anno.not_null()) {
471 ++attr_count; // has AnnotationDefault attribute
472 }
473 // Deprecated attribute would go here
474 if (access_flags.is_synthetic()) { // FIXME
475 // ++attr_count;
476 }
477 if (generic_signature_index != 0) {
478 ++attr_count;
479 }
480 if (anno.not_null()) {
481 ++attr_count; // has RuntimeVisibleAnnotations attribute
482 }
483 if (param_anno.not_null()) {
484 ++attr_count; // has RuntimeVisibleParameterAnnotations attribute
485 }
487 write_u2(attr_count);
488 if (const_method->code_size() > 0) {
489 write_code_attribute(method);
490 }
491 if (const_method->has_checked_exceptions()) {
492 write_exceptions_attribute(const_method);
493 }
494 if (default_anno.not_null()) {
495 write_annotations_attribute("AnnotationDefault", default_anno);
496 }
497 // Deprecated attribute would go here
498 if (access_flags.is_synthetic()) {
499 // write_synthetic_attribute();
500 }
501 if (generic_signature_index != 0) {
502 write_signature_attribute(generic_signature_index);
503 }
504 if (anno.not_null()) {
505 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
506 }
507 if (param_anno.not_null()) {
508 write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
509 }
510 }
512 // Write the class attributes portion of ClassFile structure
513 // JVMSpec| u2 attributes_count;
514 // JVMSpec| attribute_info attributes[attributes_count];
515 void JvmtiClassFileReconstituter::write_class_attributes() {
516 u2 inner_classes_length = inner_classes_attribute_length();
517 Symbol* generic_signature = ikh()->generic_signature();
518 typeArrayHandle anno(thread(), ikh()->class_annotations());
520 int attr_count = 0;
521 if (generic_signature != NULL) {
522 ++attr_count;
523 }
524 if (ikh()->source_file_name() != NULL) {
525 ++attr_count;
526 }
527 if (ikh()->source_debug_extension() != NULL) {
528 ++attr_count;
529 }
530 if (inner_classes_length > 0) {
531 ++attr_count;
532 }
533 if (anno.not_null()) {
534 ++attr_count; // has RuntimeVisibleAnnotations attribute
535 }
537 write_u2(attr_count);
539 if (generic_signature != NULL) {
540 write_signature_attribute(symbol_to_cpool_index(generic_signature));
541 }
542 if (ikh()->source_file_name() != NULL) {
543 write_source_file_attribute();
544 }
545 if (ikh()->source_debug_extension() != NULL) {
546 write_source_debug_extension_attribute();
547 }
548 if (inner_classes_length > 0) {
549 write_inner_classes_attribute(inner_classes_length);
550 }
551 if (anno.not_null()) {
552 write_annotations_attribute("RuntimeVisibleAnnotations", anno);
553 }
554 }
556 // Write the method information portion of ClassFile structure
557 // JVMSpec| u2 methods_count;
558 // JVMSpec| method_info methods[methods_count];
559 void JvmtiClassFileReconstituter::write_method_infos() {
560 HandleMark hm(thread());
561 objArrayHandle methods(thread(), ikh()->methods());
562 int num_methods = methods->length();
564 write_u2(num_methods);
565 if (JvmtiExport::can_maintain_original_method_order()) {
566 int index;
567 int original_index;
568 int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);
570 // invert the method order mapping
571 for (index = 0; index < num_methods; index++) {
572 original_index = ikh()->method_ordering()->int_at(index);
573 assert(original_index >= 0 && original_index < num_methods,
574 "invalid original method index");
575 method_order[original_index] = index;
576 }
578 // write in original order
579 for (original_index = 0; original_index < num_methods; original_index++) {
580 index = method_order[original_index];
581 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
582 write_method_info(method);
583 }
584 } else {
585 // method order not preserved just dump the method infos
586 for (int index = 0; index < num_methods; index++) {
587 methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
588 write_method_info(method);
589 }
590 }
591 }
593 void JvmtiClassFileReconstituter::write_class_file_format() {
594 ReallocMark();
596 // JVMSpec| ClassFile {
597 // JVMSpec| u4 magic;
598 write_u4(0xCAFEBABE);
600 // JVMSpec| u2 minor_version;
601 // JVMSpec| u2 major_version;
602 write_u2(ikh()->minor_version());
603 u2 major = ikh()->major_version();
604 write_u2(major);
606 // JVMSpec| u2 constant_pool_count;
607 // JVMSpec| cp_info constant_pool[constant_pool_count-1];
608 write_u2(cpool()->length());
609 copy_cpool_bytes(writeable_address(cpool_size()));
611 // JVMSpec| u2 access_flags;
612 write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
614 // JVMSpec| u2 this_class;
615 // JVMSpec| u2 super_class;
616 write_u2(class_symbol_to_cpool_index(ikh()->name()));
617 klassOop super_class = ikh()->super();
618 write_u2(super_class == NULL? 0 : // zero for java.lang.Object
619 class_symbol_to_cpool_index(super_class->klass_part()->name()));
621 // JVMSpec| u2 interfaces_count;
622 // JVMSpec| u2 interfaces[interfaces_count];
623 objArrayHandle interfaces(thread(), ikh()->local_interfaces());
624 int num_interfaces = interfaces->length();
625 write_u2(num_interfaces);
626 for (int index = 0; index < num_interfaces; index++) {
627 HandleMark hm(thread());
628 instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));
629 write_u2(class_symbol_to_cpool_index(iikh->name()));
630 }
632 // JVMSpec| u2 fields_count;
633 // JVMSpec| field_info fields[fields_count];
634 write_field_infos();
636 // JVMSpec| u2 methods_count;
637 // JVMSpec| method_info methods[methods_count];
638 write_method_infos();
640 // JVMSpec| u2 attributes_count;
641 // JVMSpec| attribute_info attributes[attributes_count];
642 // JVMSpec| } /* end ClassFile 8?
643 write_class_attributes();
644 }
646 address JvmtiClassFileReconstituter::writeable_address(size_t size) {
647 size_t used_size = _buffer_ptr - _buffer;
648 if (size + used_size >= _buffer_size) {
649 // compute the new buffer size: must be at least twice as big as before
650 // plus whatever new is being used; then convert to nice clean block boundary
651 size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
652 * initial_buffer_size;
654 // VM goes belly-up if the memory isn't available, so cannot do OOM processing
655 _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
656 _buffer_size = new_buffer_size;
657 _buffer_ptr = _buffer + used_size;
658 }
659 u1* ret_ptr = _buffer_ptr;
660 _buffer_ptr += size;
661 return ret_ptr;
662 }
664 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
665 TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));
666 assert(sym != NULL, "attribute name symbol not found");
667 u2 attr_name_index = symbol_to_cpool_index(sym);
668 assert(attr_name_index != 0, "attribute name symbol not in constant pool");
669 write_u2(attr_name_index);
670 }
672 void JvmtiClassFileReconstituter::write_u1(u1 x) {
673 *writeable_address(1) = x;
674 }
676 void JvmtiClassFileReconstituter::write_u2(u2 x) {
677 Bytes::put_Java_u2(writeable_address(2), x);
678 }
680 void JvmtiClassFileReconstituter::write_u4(u4 x) {
681 Bytes::put_Java_u4(writeable_address(4), x);
682 }
684 void JvmtiClassFileReconstituter::write_u8(u8 x) {
685 Bytes::put_Java_u8(writeable_address(8), x);
686 }
688 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
689 unsigned char* bytecodes) {
690 // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
691 // and the breakpoint bytecode are converted to their original bytecodes.
693 BytecodeStream bs(mh);
695 unsigned char* p = bytecodes;
696 Bytecodes::Code code;
697 bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();
699 while ((code = bs.next()) >= 0) {
700 assert(Bytecodes::is_java_code(code), "sanity check");
701 assert(code != Bytecodes::_breakpoint, "sanity check");
703 // length of bytecode (mnemonic + operands)
704 address bcp = bs.bcp();
705 int len = bs.instruction_size();
706 assert(len > 0, "length must be > 0");
708 // copy the bytecodes
709 *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
710 if (len > 1) {
711 memcpy(p+1, bcp+1, len-1);
712 }
714 // During linking the get/put and invoke instructions are rewritten
715 // with an index into the constant pool cache. The original constant
716 // pool index must be returned to caller. Rewrite the index.
717 if (is_rewritten && len >= 3) {
718 switch (code) {
719 case Bytecodes::_getstatic : // fall through
720 case Bytecodes::_putstatic : // fall through
721 case Bytecodes::_getfield : // fall through
722 case Bytecodes::_putfield : // fall through
723 case Bytecodes::_invokevirtual : // fall through
724 case Bytecodes::_invokespecial : // fall through
725 case Bytecodes::_invokestatic : // fall through
726 case Bytecodes::_invokedynamic : // fall through
727 case Bytecodes::_invokeinterface :
728 assert(len == 3 ||
729 (code == Bytecodes::_invokeinterface && len == 5) ||
730 (code == Bytecodes::_invokedynamic && len == 5),
731 "sanity check");
733 int cpci = Bytes::get_native_u2(bcp+1);
734 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);
735 if (is_invokedynamic)
736 cpci = Bytes::get_native_u4(bcp+1);
737 // cache cannot be pre-fetched since some classes won't have it yet
738 ConstantPoolCacheEntry* entry =
739 mh->constants()->cache()->main_entry_at(cpci);
740 int i = entry->constant_pool_index();
741 assert(i < mh->constants()->length(), "sanity check");
742 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering
743 if (is_invokedynamic) *(p+3) = *(p+4) = 0;
744 break;
745 }
746 }
748 p += len;
749 }
750 }
