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annotate src/share/vm/prims/jvmtiClassFileReconstituter.cpp @ 1615:ff38d05ea86f
6956958: assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() || is_optimized() || is_megam
Reviewed-by: kvn
author | never |
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date | Fri, 18 Jun 2010 16:51:54 -0700 |
parents | e9ff18c4ace7 |
children | f95d63e2154a |
rev | line source |
---|---|
0 | 1 /* |
1579 | 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 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(); | |
1565 | 641 int len = bs.instruction_size(); |
0 | 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 | |
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662 case Bytecodes::_invokedynamic : // fall through |
0 | 663 case Bytecodes::_invokeinterface : |
664 assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5), | |
665 "sanity check"); | |
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666 int cpci = Bytes::get_native_u2(bcp+1); |
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667 bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic); |
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668 if (is_invokedynamic) |
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669 cpci = Bytes::get_native_u4(bcp+1); |
0 | 670 // cache cannot be pre-fetched since some classes won't have it yet |
671 ConstantPoolCacheEntry* entry = | |
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672 mh->constants()->cache()->main_entry_at(cpci); |
0 | 673 int i = entry->constant_pool_index(); |
674 assert(i < mh->constants()->length(), "sanity check"); | |
675 Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering | |
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676 if (is_invokedynamic) *(p+3) = *(p+4) = 0; |
0 | 677 break; |
678 } | |
679 } | |
680 | |
681 p += len; | |
682 } | |
683 } |