1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_classFileParser.cpp.incl"
27
28 // We generally try to create the oops directly when parsing, rather than allocating
29 // temporary data structures and copying the bytes twice. A temporary area is only
30 // needed when parsing utf8 entries in the constant pool and when parsing line number
31 // tables.
32
33 // We add assert in debug mode when class format is not checked.
34
35 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
36 #define JAVA_MIN_SUPPORTED_VERSION 45
37 #define JAVA_MAX_SUPPORTED_VERSION 50
38 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
39
40 // Used for two backward compatibility reasons:
41 // - to check for new additions to the class file format in JDK1.5
42 // - to check for bug fixes in the format checker in JDK1.5
43 #define JAVA_1_5_VERSION 49
44
45 // Used for backward compatibility reasons:
46 // - to check for javac bug fixes that happened after 1.5
47 #define JAVA_6_VERSION 50
48
49
50 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
51 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
52 // this function (_current can be allocated in a register, with scalar
53 // replacement of aggregates). The _current pointer is copied back to
54 // stream() when this function returns. DON'T call another method within
55 // this method that uses stream().
56 ClassFileStream* cfs0 = stream();
57 ClassFileStream cfs1 = *cfs0;
58 ClassFileStream* cfs = &cfs1;
59 #ifdef ASSERT
60 u1* old_current = cfs0->current();
61 #endif
62
63 // Used for batching symbol allocations.
64 const char* names[SymbolTable::symbol_alloc_batch_size];
65 int lengths[SymbolTable::symbol_alloc_batch_size];
66 int indices[SymbolTable::symbol_alloc_batch_size];
67 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
68 int names_count = 0;
69
70 // parsing Index 0 is unused
71 for (int index = 1; index < length; index++) {
72 // Each of the following case guarantees one more byte in the stream
73 // for the following tag or the access_flags following constant pool,
74 // so we don't need bounds-check for reading tag.
75 u1 tag = cfs->get_u1_fast();
76 switch (tag) {
77 case JVM_CONSTANT_Class :
78 {
79 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
80 u2 name_index = cfs->get_u2_fast();
81 cp->klass_index_at_put(index, name_index);
82 }
83 break;
84 case JVM_CONSTANT_Fieldref :
85 {
86 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
87 u2 class_index = cfs->get_u2_fast();
88 u2 name_and_type_index = cfs->get_u2_fast();
89 cp->field_at_put(index, class_index, name_and_type_index);
90 }
91 break;
92 case JVM_CONSTANT_Methodref :
93 {
94 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
95 u2 class_index = cfs->get_u2_fast();
96 u2 name_and_type_index = cfs->get_u2_fast();
97 cp->method_at_put(index, class_index, name_and_type_index);
98 }
99 break;
100 case JVM_CONSTANT_InterfaceMethodref :
101 {
102 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
103 u2 class_index = cfs->get_u2_fast();
104 u2 name_and_type_index = cfs->get_u2_fast();
105 cp->interface_method_at_put(index, class_index, name_and_type_index);
106 }
107 break;
108 case JVM_CONSTANT_String :
109 {
110 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
111 u2 string_index = cfs->get_u2_fast();
112 cp->string_index_at_put(index, string_index);
113 }
114 break;
115 case JVM_CONSTANT_Integer :
116 {
117 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
118 u4 bytes = cfs->get_u4_fast();
119 cp->int_at_put(index, (jint) bytes);
120 }
121 break;
122 case JVM_CONSTANT_Float :
123 {
124 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
125 u4 bytes = cfs->get_u4_fast();
126 cp->float_at_put(index, *(jfloat*)&bytes);
127 }
128 break;
129 case JVM_CONSTANT_Long :
130 // A mangled type might cause you to overrun allocated memory
131 guarantee_property(index+1 < length,
132 "Invalid constant pool entry %u in class file %s",
133 index, CHECK);
134 {
135 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
136 u8 bytes = cfs->get_u8_fast();
137 cp->long_at_put(index, bytes);
138 }
139 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
140 break;
141 case JVM_CONSTANT_Double :
142 // A mangled type might cause you to overrun allocated memory
143 guarantee_property(index+1 < length,
144 "Invalid constant pool entry %u in class file %s",
145 index, CHECK);
146 {
147 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
148 u8 bytes = cfs->get_u8_fast();
149 cp->double_at_put(index, *(jdouble*)&bytes);
150 }
151 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
152 break;
153 case JVM_CONSTANT_NameAndType :
154 {
155 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
156 u2 name_index = cfs->get_u2_fast();
157 u2 signature_index = cfs->get_u2_fast();
158 cp->name_and_type_at_put(index, name_index, signature_index);
159 }
160 break;
161 case JVM_CONSTANT_Utf8 :
162 {
163 cfs->guarantee_more(2, CHECK); // utf8_length
164 u2 utf8_length = cfs->get_u2_fast();
165 u1* utf8_buffer = cfs->get_u1_buffer();
166 assert(utf8_buffer != NULL, "null utf8 buffer");
167 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
168 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
169 cfs->skip_u1_fast(utf8_length);
170 // Before storing the symbol, make sure it's legal
171 if (_need_verify) {
172 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
173 }
174
175 unsigned int hash;
176 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
177 if (result == NULL) {
178 names[names_count] = (char*)utf8_buffer;
179 lengths[names_count] = utf8_length;
180 indices[names_count] = index;
181 hashValues[names_count++] = hash;
182 if (names_count == SymbolTable::symbol_alloc_batch_size) {
183 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
184 names_count = 0;
185 }
186 } else {
187 cp->symbol_at_put(index, result);
188 }
189 }
190 break;
191 default:
192 classfile_parse_error(
193 "Unknown constant tag %u in class file %s", tag, CHECK);
194 break;
195 }
196 }
197
198 // Allocate the remaining symbols
199 if (names_count > 0) {
200 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
201 }
202
203 // Copy _current pointer of local copy back to stream().
204 #ifdef ASSERT
205 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
206 #endif
207 cfs0->set_current(cfs1.current());
208 }
209
210 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
211
212 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
213 ClassFileStream* cfs = stream();
214 constantPoolHandle nullHandle;
215
216 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
217 u2 length = cfs->get_u2_fast();
218 guarantee_property(
219 length >= 1, "Illegal constant pool size %u in class file %s",
220 length, CHECK_(nullHandle));
221 constantPoolOop constant_pool =
222 oopFactory::new_constantPool(length, CHECK_(nullHandle));
223 constantPoolHandle cp (THREAD, constant_pool);
224
225 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
226
227 // parsing constant pool entries
228 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
229
230 int index = 1; // declared outside of loops for portability
231
232 // first verification pass - validate cross references and fixup class and string constants
233 for (index = 1; index < length; index++) { // Index 0 is unused
234 switch (cp->tag_at(index).value()) {
235 case JVM_CONSTANT_Class :
236 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
237 break;
238 case JVM_CONSTANT_Fieldref :
239 // fall through
240 case JVM_CONSTANT_Methodref :
241 // fall through
242 case JVM_CONSTANT_InterfaceMethodref : {
243 if (!_need_verify) break;
244 int klass_ref_index = cp->klass_ref_index_at(index);
245 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
246 check_property(valid_cp_range(klass_ref_index, length) &&
247 cp->tag_at(klass_ref_index).is_klass_reference(),
248 "Invalid constant pool index %u in class file %s",
249 klass_ref_index,
250 CHECK_(nullHandle));
251 check_property(valid_cp_range(name_and_type_ref_index, length) &&
252 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
253 "Invalid constant pool index %u in class file %s",
254 name_and_type_ref_index,
255 CHECK_(nullHandle));
256 break;
257 }
258 case JVM_CONSTANT_String :
259 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
260 break;
261 case JVM_CONSTANT_Integer :
262 break;
263 case JVM_CONSTANT_Float :
264 break;
265 case JVM_CONSTANT_Long :
266 case JVM_CONSTANT_Double :
267 index++;
268 check_property(
269 (index < length && cp->tag_at(index).is_invalid()),
270 "Improper constant pool long/double index %u in class file %s",
271 index, CHECK_(nullHandle));
272 break;
273 case JVM_CONSTANT_NameAndType : {
274 if (!_need_verify) break;
275 int name_ref_index = cp->name_ref_index_at(index);
276 int signature_ref_index = cp->signature_ref_index_at(index);
277 check_property(
278 valid_cp_range(name_ref_index, length) &&
279 cp->tag_at(name_ref_index).is_utf8(),
280 "Invalid constant pool index %u in class file %s",
281 name_ref_index, CHECK_(nullHandle));
282 check_property(
283 valid_cp_range(signature_ref_index, length) &&
284 cp->tag_at(signature_ref_index).is_utf8(),
285 "Invalid constant pool index %u in class file %s",
286 signature_ref_index, CHECK_(nullHandle));
287 break;
288 }
289 case JVM_CONSTANT_Utf8 :
290 break;
291 case JVM_CONSTANT_UnresolvedClass : // fall-through
292 case JVM_CONSTANT_UnresolvedClassInError:
293 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
294 break;
295 case JVM_CONSTANT_ClassIndex :
296 {
297 int class_index = cp->klass_index_at(index);
298 check_property(
299 valid_cp_range(class_index, length) &&
300 cp->tag_at(class_index).is_utf8(),
301 "Invalid constant pool index %u in class file %s",
302 class_index, CHECK_(nullHandle));
303 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
304 }
305 break;
306 case JVM_CONSTANT_UnresolvedString :
307 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
308 break;
309 case JVM_CONSTANT_StringIndex :
310 {
311 int string_index = cp->string_index_at(index);
312 check_property(
313 valid_cp_range(string_index, length) &&
314 cp->tag_at(string_index).is_utf8(),
315 "Invalid constant pool index %u in class file %s",
316 string_index, CHECK_(nullHandle));
317 symbolOop sym = cp->symbol_at(string_index);
318 cp->unresolved_string_at_put(index, sym);
319 }
320 break;
321 default:
322 fatal1("bad constant pool tag value %u", cp->tag_at(index).value());
323 ShouldNotReachHere();
324 break;
325 } // end of switch
326 } // end of for
327
328 if (!_need_verify) {
329 return cp;
330 }
331
332 // second verification pass - checks the strings are of the right format.
333 for (index = 1; index < length; index++) {
334 jbyte tag = cp->tag_at(index).value();
335 switch (tag) {
336 case JVM_CONSTANT_UnresolvedClass: {
337 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
338 verify_legal_class_name(class_name, CHECK_(nullHandle));
339 break;
340 }
341 case JVM_CONSTANT_Fieldref:
342 case JVM_CONSTANT_Methodref:
343 case JVM_CONSTANT_InterfaceMethodref: {
344 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
345 // already verified to be utf8
346 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
347 // already verified to be utf8
348 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
349 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
350 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
351 if (tag == JVM_CONSTANT_Fieldref) {
352 verify_legal_field_name(name, CHECK_(nullHandle));
353 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
354 } else {
355 verify_legal_method_name(name, CHECK_(nullHandle));
356 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
357 if (tag == JVM_CONSTANT_Methodref) {
358 // 4509014: If a class method name begins with '<', it must be "<init>".
359 assert(!name.is_null(), "method name in constant pool is null");
360 unsigned int name_len = name->utf8_length();
361 assert(name_len > 0, "bad method name"); // already verified as legal name
362 if (name->byte_at(0) == '<') {
363 if (name() != vmSymbols::object_initializer_name()) {
364 classfile_parse_error(
365 "Bad method name at constant pool index %u in class file %s",
366 name_ref_index, CHECK_(nullHandle));
367 }
368 }
369 }
370 }
371 break;
372 }
373 } // end of switch
374 } // end of for
375
376 return cp;
377 }
378
379
380 class NameSigHash: public ResourceObj {
381 public:
382 symbolOop _name; // name
383 symbolOop _sig; // signature
384 NameSigHash* _next; // Next entry in hash table
385 };
386
387
388 #define HASH_ROW_SIZE 256
389
390 unsigned int hash(symbolOop name, symbolOop sig) {
391 unsigned int raw_hash = 0;
392 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
393 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
394
395 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
396 }
397
398
399 void initialize_hashtable(NameSigHash** table) {
400 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
401 }
402
403 // Return false if the name/sig combination is found in table.
404 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
405 // The old format checker uses heap sort to find duplicates.
406 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
407 // of table since we don't expect symbolOop's to move.
408 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
409 assert(name != NULL, "name in constant pool is NULL");
410
411 // First lookup for duplicates
412 int index = hash(name, sig);
413 NameSigHash* entry = table[index];
414 while (entry != NULL) {
415 if (entry->_name == name && entry->_sig == sig) {
416 return false;
417 }
418 entry = entry->_next;
419 }
420
421 // No duplicate is found, allocate a new entry and fill it.
422 entry = new NameSigHash();
423 entry->_name = name;
424 entry->_sig = sig;
425
426 // Insert into hash table
427 entry->_next = table[index];
428 table[index] = entry;
429
430 return true;
431 }
432
433
434 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
435 int length,
436 Handle class_loader,
437 Handle protection_domain,
438 PerfTraceTime* vmtimer,
439 symbolHandle class_name,
440 TRAPS) {
441 ClassFileStream* cfs = stream();
442 assert(length > 0, "only called for length>0");
443 objArrayHandle nullHandle;
444 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
445 objArrayHandle interfaces (THREAD, interface_oop);
446
447 int index;
448 for (index = 0; index < length; index++) {
449 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
450 check_property(
451 valid_cp_range(interface_index, cp->length()) &&
452 cp->tag_at(interface_index).is_unresolved_klass(),
453 "Interface name has bad constant pool index %u in class file %s",
454 interface_index, CHECK_(nullHandle));
455 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
456
457 // Don't need to check legal name because it's checked when parsing constant pool.
458 // But need to make sure it's not an array type.
459 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
460 "Bad interface name in class file %s", CHECK_(nullHandle));
461
462 vmtimer->suspend(); // do not count recursive loading twice
463 // Call resolve_super so classcircularity is checked
464 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
465 unresolved_klass, class_loader, protection_domain,
466 false, CHECK_(nullHandle));
467 KlassHandle interf (THREAD, k);
468 vmtimer->resume();
469
470 if (!Klass::cast(interf())->is_interface()) {
471 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
472 }
473 interfaces->obj_at_put(index, interf());
474 }
475
476 if (!_need_verify || length <= 1) {
477 return interfaces;
478 }
479
480 // Check if there's any duplicates in interfaces
481 ResourceMark rm(THREAD);
482 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
483 THREAD, NameSigHash*, HASH_ROW_SIZE);
484 initialize_hashtable(interface_names);
485 bool dup = false;
486 {
487 debug_only(No_Safepoint_Verifier nsv;)
488 for (index = 0; index < length; index++) {
489 klassOop k = (klassOop)interfaces->obj_at(index);
490 symbolOop name = instanceKlass::cast(k)->name();
491 // If no duplicates, add (name, NULL) in hashtable interface_names.
492 if (!put_after_lookup(name, NULL, interface_names)) {
493 dup = true;
494 break;
495 }
496 }
497 }
498 if (dup) {
499 classfile_parse_error("Duplicate interface name in class file %s",
500 CHECK_(nullHandle));
501 }
502
503 return interfaces;
504 }
505
506
507 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
508 // Make sure the constant pool entry is of a type appropriate to this field
509 guarantee_property(
510 (constantvalue_index > 0 &&
511 constantvalue_index < cp->length()),
512 "Bad initial value index %u in ConstantValue attribute in class file %s",
513 constantvalue_index, CHECK);
514 constantTag value_type = cp->tag_at(constantvalue_index);
515 switch ( cp->basic_type_for_signature_at(signature_index) ) {
516 case T_LONG:
517 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
518 break;
519 case T_FLOAT:
520 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
521 break;
522 case T_DOUBLE:
523 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
524 break;
525 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
526 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
527 break;
528 case T_OBJECT:
529 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18)
530 && (value_type.is_string() || value_type.is_unresolved_string())),
531 "Bad string initial value in class file %s", CHECK);
532 break;
533 default:
534 classfile_parse_error(
535 "Unable to set initial value %u in class file %s",
536 constantvalue_index, CHECK);
537 }
538 }
539
540
541 // Parse attributes for a field.
542 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
543 u2 attributes_count,
544 bool is_static, u2 signature_index,
545 u2* constantvalue_index_addr,
546 bool* is_synthetic_addr,
547 u2* generic_signature_index_addr,
548 typeArrayHandle* field_annotations,
549 TRAPS) {
550 ClassFileStream* cfs = stream();
551 assert(attributes_count > 0, "length should be greater than 0");
552 u2 constantvalue_index = 0;
553 u2 generic_signature_index = 0;
554 bool is_synthetic = false;
555 u1* runtime_visible_annotations = NULL;
556 int runtime_visible_annotations_length = 0;
557 u1* runtime_invisible_annotations = NULL;
558 int runtime_invisible_annotations_length = 0;
559 while (attributes_count--) {
560 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
561 u2 attribute_name_index = cfs->get_u2_fast();
562 u4 attribute_length = cfs->get_u4_fast();
563 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
564 cp->tag_at(attribute_name_index).is_utf8(),
565 "Invalid field attribute index %u in class file %s",
566 attribute_name_index,
567 CHECK);
568 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
569 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
570 // ignore if non-static
571 if (constantvalue_index != 0) {
572 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
573 }
574 check_property(
575 attribute_length == 2,
576 "Invalid ConstantValue field attribute length %u in class file %s",
577 attribute_length, CHECK);
578 constantvalue_index = cfs->get_u2(CHECK);
579 if (_need_verify) {
580 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
581 }
582 } else if (attribute_name == vmSymbols::tag_synthetic()) {
583 if (attribute_length != 0) {
584 classfile_parse_error(
585 "Invalid Synthetic field attribute length %u in class file %s",
586 attribute_length, CHECK);
587 }
588 is_synthetic = true;
589 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
590 if (attribute_length != 0) {
591 classfile_parse_error(
592 "Invalid Deprecated field attribute length %u in class file %s",
593 attribute_length, CHECK);
594 }
595 } else if (_major_version >= JAVA_1_5_VERSION) {
596 if (attribute_name == vmSymbols::tag_signature()) {
597 if (attribute_length != 2) {
598 classfile_parse_error(
599 "Wrong size %u for field's Signature attribute in class file %s",
600 attribute_length, CHECK);
601 }
602 generic_signature_index = cfs->get_u2(CHECK);
603 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
604 runtime_visible_annotations_length = attribute_length;
605 runtime_visible_annotations = cfs->get_u1_buffer();
606 assert(runtime_visible_annotations != NULL, "null visible annotations");
607 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
608 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
609 runtime_invisible_annotations_length = attribute_length;
610 runtime_invisible_annotations = cfs->get_u1_buffer();
611 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
612 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
613 } else {
614 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
615 }
616 } else {
617 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
618 }
619 }
620
621 *constantvalue_index_addr = constantvalue_index;
622 *is_synthetic_addr = is_synthetic;
623 *generic_signature_index_addr = generic_signature_index;
624 *field_annotations = assemble_annotations(runtime_visible_annotations,
625 runtime_visible_annotations_length,
626 runtime_invisible_annotations,
627 runtime_invisible_annotations_length,
628 CHECK);
629 return;
630 }
631
632
633 // Field allocation types. Used for computing field offsets.
634
635 enum FieldAllocationType {
636 STATIC_OOP, // Oops
637 STATIC_BYTE, // Boolean, Byte, char
638 STATIC_SHORT, // shorts
639 STATIC_WORD, // ints
640 STATIC_DOUBLE, // long or double
641 STATIC_ALIGNED_DOUBLE,// aligned long or double
642 NONSTATIC_OOP,
643 NONSTATIC_BYTE,
644 NONSTATIC_SHORT,
645 NONSTATIC_WORD,
646 NONSTATIC_DOUBLE,
647 NONSTATIC_ALIGNED_DOUBLE
648 };
649
650
651 struct FieldAllocationCount {
652 int static_oop_count;
653 int static_byte_count;
654 int static_short_count;
655 int static_word_count;
656 int static_double_count;
657 int nonstatic_oop_count;
658 int nonstatic_byte_count;
659 int nonstatic_short_count;
660 int nonstatic_word_count;
661 int nonstatic_double_count;
662 };
663
664 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
665 struct FieldAllocationCount *fac,
666 objArrayHandle* fields_annotations, TRAPS) {
667 ClassFileStream* cfs = stream();
668 typeArrayHandle nullHandle;
669 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
670 u2 length = cfs->get_u2_fast();
671 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
672 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
673 typeArrayHandle fields(THREAD, new_fields);
674
675 int index = 0;
676 typeArrayHandle field_annotations;
677 for (int n = 0; n < length; n++) {
678 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
679
680 AccessFlags access_flags;
681 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
682 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
683 access_flags.set_flags(flags);
684
685 u2 name_index = cfs->get_u2_fast();
686 int cp_size = cp->length();
687 check_property(
688 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
689 "Invalid constant pool index %u for field name in class file %s",
690 name_index, CHECK_(nullHandle));
691 symbolHandle name(THREAD, cp->symbol_at(name_index));
692 verify_legal_field_name(name, CHECK_(nullHandle));
693
694 u2 signature_index = cfs->get_u2_fast();
695 check_property(
696 valid_cp_range(signature_index, cp_size) &&
697 cp->tag_at(signature_index).is_utf8(),
698 "Invalid constant pool index %u for field signature in class file %s",
699 signature_index, CHECK_(nullHandle));
700 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
701 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
702
703 u2 constantvalue_index = 0;
704 bool is_synthetic = false;
705 u2 generic_signature_index = 0;
706 bool is_static = access_flags.is_static();
707
708 u2 attributes_count = cfs->get_u2_fast();
709 if (attributes_count > 0) {
710 parse_field_attributes(cp, attributes_count, is_static, signature_index,
711 &constantvalue_index, &is_synthetic,
712 &generic_signature_index, &field_annotations,
713 CHECK_(nullHandle));
714 if (field_annotations.not_null()) {
715 if (fields_annotations->is_null()) {
716 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
717 *fields_annotations = objArrayHandle(THREAD, md);
718 }
719 (*fields_annotations)->obj_at_put(n, field_annotations());
720 }
721 if (is_synthetic) {
722 access_flags.set_is_synthetic();
723 }
724 }
725
726 fields->short_at_put(index++, access_flags.as_short());
727 fields->short_at_put(index++, name_index);
728 fields->short_at_put(index++, signature_index);
729 fields->short_at_put(index++, constantvalue_index);
730
731 // Remember how many oops we encountered and compute allocation type
732 BasicType type = cp->basic_type_for_signature_at(signature_index);
733 FieldAllocationType atype;
734 if ( is_static ) {
735 switch ( type ) {
736 case T_BOOLEAN:
737 case T_BYTE:
738 fac->static_byte_count++;
739 atype = STATIC_BYTE;
740 break;
741 case T_LONG:
742 case T_DOUBLE:
743 if (Universe::field_type_should_be_aligned(type)) {
744 atype = STATIC_ALIGNED_DOUBLE;
745 } else {
746 atype = STATIC_DOUBLE;
747 }
748 fac->static_double_count++;
749 break;
750 case T_CHAR:
751 case T_SHORT:
752 fac->static_short_count++;
753 atype = STATIC_SHORT;
754 break;
755 case T_FLOAT:
756 case T_INT:
757 fac->static_word_count++;
758 atype = STATIC_WORD;
759 break;
760 case T_ARRAY:
761 case T_OBJECT:
762 fac->static_oop_count++;
763 atype = STATIC_OOP;
764 break;
765 case T_ADDRESS:
766 case T_VOID:
767 default:
768 assert(0, "bad field type");
769 }
770 } else {
771 switch ( type ) {
772 case T_BOOLEAN:
773 case T_BYTE:
774 fac->nonstatic_byte_count++;
775 atype = NONSTATIC_BYTE;
776 break;
777 case T_LONG:
778 case T_DOUBLE:
779 if (Universe::field_type_should_be_aligned(type)) {
780 atype = NONSTATIC_ALIGNED_DOUBLE;
781 } else {
782 atype = NONSTATIC_DOUBLE;
783 }
784 fac->nonstatic_double_count++;
785 break;
786 case T_CHAR:
787 case T_SHORT:
788 fac->nonstatic_short_count++;
789 atype = NONSTATIC_SHORT;
790 break;
791 case T_FLOAT:
792 case T_INT:
793 fac->nonstatic_word_count++;
794 atype = NONSTATIC_WORD;
795 break;
796 case T_ARRAY:
797 case T_OBJECT:
798 fac->nonstatic_oop_count++;
799 atype = NONSTATIC_OOP;
800 break;
801 case T_ADDRESS:
802 case T_VOID:
803 default:
804 assert(0, "bad field type");
805 }
806 }
807
808 // The correct offset is computed later (all oop fields will be located together)
809 // We temporarily store the allocation type in the offset field
810 fields->short_at_put(index++, atype);
811 fields->short_at_put(index++, 0); // Clear out high word of byte offset
812 fields->short_at_put(index++, generic_signature_index);
813 }
814
815 if (_need_verify && length > 1) {
816 // Check duplicated fields
817 ResourceMark rm(THREAD);
818 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
819 THREAD, NameSigHash*, HASH_ROW_SIZE);
820 initialize_hashtable(names_and_sigs);
821 bool dup = false;
822 {
823 debug_only(No_Safepoint_Verifier nsv;)
824 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
825 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
826 symbolOop name = cp->symbol_at(name_index);
827 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
828 symbolOop sig = cp->symbol_at(sig_index);
829 // If no duplicates, add name/signature in hashtable names_and_sigs.
830 if (!put_after_lookup(name, sig, names_and_sigs)) {
831 dup = true;
832 break;
833 }
834 }
835 }
836 if (dup) {
837 classfile_parse_error("Duplicate field name&signature in class file %s",
838 CHECK_(nullHandle));
839 }
840 }
841
842 return fields;
843 }
844
845
846 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
847 while (length-- > 0) {
848 *dest++ = Bytes::get_Java_u2((u1*) (src++));
849 }
850 }
851
852
853 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
854 u4 exception_table_length,
855 constantPoolHandle cp,
856 TRAPS) {
857 ClassFileStream* cfs = stream();
858 typeArrayHandle nullHandle;
859
860 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
861 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
862 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
863
864 int index = 0;
865 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
866 for (unsigned int i = 0; i < exception_table_length; i++) {
867 u2 start_pc = cfs->get_u2_fast();
868 u2 end_pc = cfs->get_u2_fast();
869 u2 handler_pc = cfs->get_u2_fast();
870 u2 catch_type_index = cfs->get_u2_fast();
871 // Will check legal target after parsing code array in verifier.
872 if (_need_verify) {
873 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
874 "Illegal exception table range in class file %s", CHECK_(nullHandle));
875 guarantee_property(handler_pc < code_length,
876 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
877 if (catch_type_index != 0) {
878 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
879 (cp->tag_at(catch_type_index).is_klass() ||
880 cp->tag_at(catch_type_index).is_unresolved_klass()),
881 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
882 }
883 }
884 exception_handlers->int_at_put(index++, start_pc);
885 exception_handlers->int_at_put(index++, end_pc);
886 exception_handlers->int_at_put(index++, handler_pc);
887 exception_handlers->int_at_put(index++, catch_type_index);
888 }
889 return exception_handlers;
890 }
891
892 void ClassFileParser::parse_linenumber_table(
893 u4 code_attribute_length, u4 code_length,
894 CompressedLineNumberWriteStream** write_stream, TRAPS) {
895 ClassFileStream* cfs = stream();
896 unsigned int num_entries = cfs->get_u2(CHECK);
897
898 // Each entry is a u2 start_pc, and a u2 line_number
899 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
900
901 // Verify line number attribute and table length
902 check_property(
903 code_attribute_length == sizeof(u2) + length_in_bytes,
904 "LineNumberTable attribute has wrong length in class file %s", CHECK);
905
906 cfs->guarantee_more(length_in_bytes, CHECK);
907
908 if ((*write_stream) == NULL) {
909 if (length_in_bytes > fixed_buffer_size) {
910 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
911 } else {
912 (*write_stream) = new CompressedLineNumberWriteStream(
913 linenumbertable_buffer, fixed_buffer_size);
914 }
915 }
916
917 while (num_entries-- > 0) {
918 u2 bci = cfs->get_u2_fast(); // start_pc
919 u2 line = cfs->get_u2_fast(); // line_number
920 guarantee_property(bci < code_length,
921 "Invalid pc in LineNumberTable in class file %s", CHECK);
922 (*write_stream)->write_pair(bci, line);
923 }
924 }
925
926
927 // Class file LocalVariableTable elements.
928 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
929 public:
930 u2 start_bci;
931 u2 length;
932 u2 name_cp_index;
933 u2 descriptor_cp_index;
934 u2 slot;
935 };
936
937
938 class LVT_Hash: public CHeapObj {
939 public:
940 LocalVariableTableElement *_elem; // element
941 LVT_Hash* _next; // Next entry in hash table
942 };
943
944 unsigned int hash(LocalVariableTableElement *elem) {
945 unsigned int raw_hash = elem->start_bci;
946
947 raw_hash = elem->length + raw_hash * 37;
948 raw_hash = elem->name_cp_index + raw_hash * 37;
949 raw_hash = elem->slot + raw_hash * 37;
950
951 return raw_hash % HASH_ROW_SIZE;
952 }
953
954 void initialize_hashtable(LVT_Hash** table) {
955 for (int i = 0; i < HASH_ROW_SIZE; i++) {
956 table[i] = NULL;
957 }
958 }
959
960 void clear_hashtable(LVT_Hash** table) {
961 for (int i = 0; i < HASH_ROW_SIZE; i++) {
962 LVT_Hash* current = table[i];
963 LVT_Hash* next;
964 while (current != NULL) {
965 next = current->_next;
966 current->_next = NULL;
967 delete(current);
968 current = next;
969 }
970 table[i] = NULL;
971 }
972 }
973
974 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
975 LVT_Hash* entry = table[index];
976
977 /*
978 * 3-tuple start_bci/length/slot has to be unique key,
979 * so the following comparison seems to be redundant:
980 * && elem->name_cp_index == entry->_elem->name_cp_index
981 */
982 while (entry != NULL) {
983 if (elem->start_bci == entry->_elem->start_bci
984 && elem->length == entry->_elem->length
985 && elem->name_cp_index == entry->_elem->name_cp_index
986 && elem->slot == entry->_elem->slot
987 ) {
988 return entry;
989 }
990 entry = entry->_next;
991 }
992 return NULL;
993 }
994
995 // Return false if the local variable is found in table.
996 // Return true if no duplicate is found.
997 // And local variable is added as a new entry in table.
998 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
999 // First lookup for duplicates
1000 int index = hash(elem);
1001 LVT_Hash* entry = LVT_lookup(elem, index, table);
1002
1003 if (entry != NULL) {
1004 return false;
1005 }
1006 // No duplicate is found, allocate a new entry and fill it.
1007 if ((entry = new LVT_Hash()) == NULL) {
1008 return false;
1009 }
1010 entry->_elem = elem;
1011
1012 // Insert into hash table
1013 entry->_next = table[index];
1014 table[index] = entry;
1015
1016 return true;
1017 }
1018
1019 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1020 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1021 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1022 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1023 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1024 lvt->signature_cp_index = 0;
1025 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1026 }
1027
1028 // Function is used to parse both attributes:
1029 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1030 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1031 u2 max_locals,
1032 u4 code_attribute_length,
1033 constantPoolHandle cp,
1034 u2* localvariable_table_length,
1035 bool isLVTT,
1036 TRAPS) {
1037 ClassFileStream* cfs = stream();
1038 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1039 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1040 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1041 // Verify local variable table attribute has right length
1042 if (_need_verify) {
1043 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1044 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1045 }
1046 u2* localvariable_table_start = cfs->get_u2_buffer();
1047 assert(localvariable_table_start != NULL, "null local variable table");
1048 if (!_need_verify) {
1049 cfs->skip_u2_fast(size);
1050 } else {
1051 cfs->guarantee_more(size * 2, CHECK_NULL);
1052 for(int i = 0; i < (*localvariable_table_length); i++) {
1053 u2 start_pc = cfs->get_u2_fast();
1054 u2 length = cfs->get_u2_fast();
1055 u2 name_index = cfs->get_u2_fast();
1056 u2 descriptor_index = cfs->get_u2_fast();
1057 u2 index = cfs->get_u2_fast();
1058 // Assign to a u4 to avoid overflow
1059 u4 end_pc = (u4)start_pc + (u4)length;
1060
1061 if (start_pc >= code_length) {
1062 classfile_parse_error(
1063 "Invalid start_pc %u in %s in class file %s",
1064 start_pc, tbl_name, CHECK_NULL);
1065 }
1066 if (end_pc > code_length) {
1067 classfile_parse_error(
1068 "Invalid length %u in %s in class file %s",
1069 length, tbl_name, CHECK_NULL);
1070 }
1071 int cp_size = cp->length();
1072 guarantee_property(
1073 valid_cp_range(name_index, cp_size) &&
1074 cp->tag_at(name_index).is_utf8(),
1075 "Name index %u in %s has bad constant type in class file %s",
1076 name_index, tbl_name, CHECK_NULL);
1077 guarantee_property(
1078 valid_cp_range(descriptor_index, cp_size) &&
1079 cp->tag_at(descriptor_index).is_utf8(),
1080 "Signature index %u in %s has bad constant type in class file %s",
1081 descriptor_index, tbl_name, CHECK_NULL);
1082
1083 symbolHandle name(THREAD, cp->symbol_at(name_index));
1084 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1085 verify_legal_field_name(name, CHECK_NULL);
1086 u2 extra_slot = 0;
1087 if (!isLVTT) {
1088 verify_legal_field_signature(name, sig, CHECK_NULL);
1089
1090 // 4894874: check special cases for double and long local variables
1091 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1092 sig() == vmSymbols::type_signature(T_LONG)) {
1093 extra_slot = 1;
1094 }
1095 }
1096 guarantee_property((index + extra_slot) < max_locals,
1097 "Invalid index %u in %s in class file %s",
1098 index, tbl_name, CHECK_NULL);
1099 }
1100 }
1101 return localvariable_table_start;
1102 }
1103
1104
1105 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1106 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1107 ClassFileStream* cfs = stream();
1108 u2 index = 0; // index in the array with long/double occupying two slots
1109 u4 i1 = *u1_index;
1110 u4 i2 = *u2_index + 1;
1111 for(int i = 0; i < array_length; i++) {
1112 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1113 index++;
1114 if (tag == ITEM_Long || tag == ITEM_Double) {
1115 index++;
1116 } else if (tag == ITEM_Object) {
1117 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1118 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1119 cp->tag_at(class_index).is_unresolved_klass(),
1120 "Bad class index %u in StackMap in class file %s",
1121 class_index, CHECK);
1122 } else if (tag == ITEM_Uninitialized) {
1123 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1124 guarantee_property(
1125 offset < code_length,
1126 "Bad uninitialized type offset %u in StackMap in class file %s",
1127 offset, CHECK);
1128 } else {
1129 guarantee_property(
1130 tag <= (u1)ITEM_Uninitialized,
1131 "Unknown variable type %u in StackMap in class file %s",
1132 tag, CHECK);
1133 }
1134 }
1135 u2_array[*u2_index] = index;
1136 *u1_index = i1;
1137 *u2_index = i2;
1138 }
1139
1140 typeArrayOop ClassFileParser::parse_stackmap_table(
1141 u4 code_attribute_length, TRAPS) {
1142 if (code_attribute_length == 0)
1143 return NULL;
1144
1145 ClassFileStream* cfs = stream();
1146 u1* stackmap_table_start = cfs->get_u1_buffer();
1147 assert(stackmap_table_start != NULL, "null stackmap table");
1148
1149 // check code_attribute_length first
1150 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1151
1152 if (!_need_verify && !DumpSharedSpaces) {
1153 return NULL;
1154 }
1155
1156 typeArrayOop stackmap_data =
1157 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1158
1159 stackmap_data->set_length(code_attribute_length);
1160 memcpy((void*)stackmap_data->byte_at_addr(0),
1161 (void*)stackmap_table_start, code_attribute_length);
1162 return stackmap_data;
1163 }
1164
1165 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1166 u4 method_attribute_length,
1167 constantPoolHandle cp, TRAPS) {
1168 ClassFileStream* cfs = stream();
1169 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1170 *checked_exceptions_length = cfs->get_u2_fast();
1171 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1172 u2* checked_exceptions_start = cfs->get_u2_buffer();
1173 assert(checked_exceptions_start != NULL, "null checked exceptions");
1174 if (!_need_verify) {
1175 cfs->skip_u2_fast(size);
1176 } else {
1177 // Verify each value in the checked exception table
1178 u2 checked_exception;
1179 u2 len = *checked_exceptions_length;
1180 cfs->guarantee_more(2 * len, CHECK_NULL);
1181 for (int i = 0; i < len; i++) {
1182 checked_exception = cfs->get_u2_fast();
1183 check_property(
1184 valid_cp_range(checked_exception, cp->length()) &&
1185 cp->tag_at(checked_exception).is_klass_reference(),
1186 "Exception name has bad type at constant pool %u in class file %s",
1187 checked_exception, CHECK_NULL);
1188 }
1189 }
1190 // check exceptions attribute length
1191 if (_need_verify) {
1192 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1193 sizeof(u2) * size),
1194 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1195 }
1196 return checked_exceptions_start;
1197 }
1198
1199
1200 #define MAX_ARGS_SIZE 255
1201 #define MAX_CODE_SIZE 65535
1202 #define INITIAL_MAX_LVT_NUMBER 256
1203
1204 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1205 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1206 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1207 // entire method attribute is parsed.
1208 //
1209 // The promoted_flags parameter is used to pass relevant access_flags
1210 // from the method back up to the containing klass. These flag values
1211 // are added to klass's access_flags.
1212
1213 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1214 AccessFlags *promoted_flags,
1215 typeArrayHandle* method_annotations,
1216 typeArrayHandle* method_parameter_annotations,
1217 typeArrayHandle* method_default_annotations,
1218 TRAPS) {
1219 ClassFileStream* cfs = stream();
1220 methodHandle nullHandle;
1221 ResourceMark rm(THREAD);
1222 // Parse fixed parts
1223 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1224
1225 int flags = cfs->get_u2_fast();
1226 u2 name_index = cfs->get_u2_fast();
1227 int cp_size = cp->length();
1228 check_property(
1229 valid_cp_range(name_index, cp_size) &&
1230 cp->tag_at(name_index).is_utf8(),
1231 "Illegal constant pool index %u for method name in class file %s",
1232 name_index, CHECK_(nullHandle));
1233 symbolHandle name(THREAD, cp->symbol_at(name_index));
1234 verify_legal_method_name(name, CHECK_(nullHandle));
1235
1236 u2 signature_index = cfs->get_u2_fast();
1237 guarantee_property(
1238 valid_cp_range(signature_index, cp_size) &&
1239 cp->tag_at(signature_index).is_utf8(),
1240 "Illegal constant pool index %u for method signature in class file %s",
1241 signature_index, CHECK_(nullHandle));
1242 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1243
1244 AccessFlags access_flags;
1245 if (name == vmSymbols::class_initializer_name()) {
1246 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1247 flags = JVM_ACC_STATIC;
1248 } else {
1249 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1250 }
1251
1252 int args_size = -1; // only used when _need_verify is true
1253 if (_need_verify) {
1254 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1255 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1256 if (args_size > MAX_ARGS_SIZE) {
1257 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1258 }
1259 }
1260
1261 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1262
1263 // Default values for code and exceptions attribute elements
1264 u2 max_stack = 0;
1265 u2 max_locals = 0;
1266 u4 code_length = 0;
1267 u1* code_start = 0;
1268 u2 exception_table_length = 0;
1269 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1270 u2 checked_exceptions_length = 0;
1271 u2* checked_exceptions_start = NULL;
1272 CompressedLineNumberWriteStream* linenumber_table = NULL;
1273 int linenumber_table_length = 0;
1274 int total_lvt_length = 0;
1275 u2 lvt_cnt = 0;
1276 u2 lvtt_cnt = 0;
1277 bool lvt_allocated = false;
1278 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1279 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1280 u2* localvariable_table_length;
1281 u2** localvariable_table_start;
1282 u2* localvariable_type_table_length;
1283 u2** localvariable_type_table_start;
1284 bool parsed_code_attribute = false;
1285 bool parsed_checked_exceptions_attribute = false;
1286 bool parsed_stackmap_attribute = false;
1287 // stackmap attribute - JDK1.5
1288 typeArrayHandle stackmap_data;
1289 u2 generic_signature_index = 0;
1290 u1* runtime_visible_annotations = NULL;
1291 int runtime_visible_annotations_length = 0;
1292 u1* runtime_invisible_annotations = NULL;
1293 int runtime_invisible_annotations_length = 0;
1294 u1* runtime_visible_parameter_annotations = NULL;
1295 int runtime_visible_parameter_annotations_length = 0;
1296 u1* runtime_invisible_parameter_annotations = NULL;
1297 int runtime_invisible_parameter_annotations_length = 0;
1298 u1* annotation_default = NULL;
1299 int annotation_default_length = 0;
1300
1301 // Parse code and exceptions attribute
1302 u2 method_attributes_count = cfs->get_u2_fast();
1303 while (method_attributes_count--) {
1304 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1305 u2 method_attribute_name_index = cfs->get_u2_fast();
1306 u4 method_attribute_length = cfs->get_u4_fast();
1307 check_property(
1308 valid_cp_range(method_attribute_name_index, cp_size) &&
1309 cp->tag_at(method_attribute_name_index).is_utf8(),
1310 "Invalid method attribute name index %u in class file %s",
1311 method_attribute_name_index, CHECK_(nullHandle));
1312
1313 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1314 if (method_attribute_name == vmSymbols::tag_code()) {
1315 // Parse Code attribute
1316 if (_need_verify) {
1317 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1318 "Code attribute in native or abstract methods in class file %s",
1319 CHECK_(nullHandle));
1320 }
1321 if (parsed_code_attribute) {
1322 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1323 }
1324 parsed_code_attribute = true;
1325
1326 // Stack size, locals size, and code size
1327 if (_major_version == 45 && _minor_version <= 2) {
1328 cfs->guarantee_more(4, CHECK_(nullHandle));
1329 max_stack = cfs->get_u1_fast();
1330 max_locals = cfs->get_u1_fast();
1331 code_length = cfs->get_u2_fast();
1332 } else {
1333 cfs->guarantee_more(8, CHECK_(nullHandle));
1334 max_stack = cfs->get_u2_fast();
1335 max_locals = cfs->get_u2_fast();
1336 code_length = cfs->get_u4_fast();
1337 }
1338 if (_need_verify) {
1339 guarantee_property(args_size <= max_locals,
1340 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1341 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1342 "Invalid method Code length %u in class file %s",
1343 code_length, CHECK_(nullHandle));
1344 }
1345 // Code pointer
1346 code_start = cfs->get_u1_buffer();
1347 assert(code_start != NULL, "null code start");
1348 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1349 cfs->skip_u1_fast(code_length);
1350
1351 // Exception handler table
1352 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1353 exception_table_length = cfs->get_u2_fast();
1354 if (exception_table_length > 0) {
1355 exception_handlers =
1356 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1357 }
1358
1359 // Parse additional attributes in code attribute
1360 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1361 u2 code_attributes_count = cfs->get_u2_fast();
1362 unsigned int calculated_attribute_length = sizeof(max_stack) +
1363 sizeof(max_locals) +
1364 sizeof(code_length) +
1365 code_length +
1366 sizeof(exception_table_length) +
1367 sizeof(code_attributes_count) +
1368 exception_table_length*(sizeof(u2) /* start_pc */+
1369 sizeof(u2) /* end_pc */ +
1370 sizeof(u2) /* handler_pc */ +
1371 sizeof(u2) /* catch_type_index */);
1372
1373 while (code_attributes_count--) {
1374 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1375 u2 code_attribute_name_index = cfs->get_u2_fast();
1376 u4 code_attribute_length = cfs->get_u4_fast();
1377 calculated_attribute_length += code_attribute_length +
1378 sizeof(code_attribute_name_index) +
1379 sizeof(code_attribute_length);
1380 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1381 cp->tag_at(code_attribute_name_index).is_utf8(),
1382 "Invalid code attribute name index %u in class file %s",
1383 code_attribute_name_index,
1384 CHECK_(nullHandle));
1385 if (LoadLineNumberTables &&
1386 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1387 // Parse and compress line number table
1388 parse_linenumber_table(code_attribute_length, code_length,
1389 &linenumber_table, CHECK_(nullHandle));
1390
1391 } else if (LoadLocalVariableTables &&
1392 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1393 // Parse local variable table
1394 if (!lvt_allocated) {
1395 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1396 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1397 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1398 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1399 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1400 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1401 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1402 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1403 lvt_allocated = true;
1404 }
1405 if (lvt_cnt == max_lvt_cnt) {
1406 max_lvt_cnt <<= 1;
1407 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1408 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1409 }
1410 localvariable_table_start[lvt_cnt] =
1411 parse_localvariable_table(code_length,
1412 max_locals,
1413 code_attribute_length,
1414 cp,
1415 &localvariable_table_length[lvt_cnt],
1416 false, // is not LVTT
1417 CHECK_(nullHandle));
1418 total_lvt_length += localvariable_table_length[lvt_cnt];
1419 lvt_cnt++;
1420 } else if (LoadLocalVariableTypeTables &&
1421 _major_version >= JAVA_1_5_VERSION &&
1422 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1423 if (!lvt_allocated) {
1424 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1425 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1426 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1427 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1428 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1429 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1430 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1431 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1432 lvt_allocated = true;
1433 }
1434 // Parse local variable type table
1435 if (lvtt_cnt == max_lvtt_cnt) {
1436 max_lvtt_cnt <<= 1;
1437 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1438 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1439 }
1440 localvariable_type_table_start[lvtt_cnt] =
1441 parse_localvariable_table(code_length,
1442 max_locals,
1443 code_attribute_length,
1444 cp,
1445 &localvariable_type_table_length[lvtt_cnt],
1446 true, // is LVTT
1447 CHECK_(nullHandle));
1448 lvtt_cnt++;
1449 } else if (UseSplitVerifier &&
1450 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1451 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1452 // Stack map is only needed by the new verifier in JDK1.5.
1453 if (parsed_stackmap_attribute) {
1454 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1455 }
1456 typeArrayOop sm =
1457 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1458 stackmap_data = typeArrayHandle(THREAD, sm);
1459 parsed_stackmap_attribute = true;
1460 } else {
1461 // Skip unknown attributes
1462 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1463 }
1464 }
1465 // check method attribute length
1466 if (_need_verify) {
1467 guarantee_property(method_attribute_length == calculated_attribute_length,
1468 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1469 }
1470 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1471 // Parse Exceptions attribute
1472 if (parsed_checked_exceptions_attribute) {
1473 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1474 }
1475 parsed_checked_exceptions_attribute = true;
1476 checked_exceptions_start =
1477 parse_checked_exceptions(&checked_exceptions_length,
1478 method_attribute_length,
1479 cp, CHECK_(nullHandle));
1480 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1481 if (method_attribute_length != 0) {
1482 classfile_parse_error(
1483 "Invalid Synthetic method attribute length %u in class file %s",
1484 method_attribute_length, CHECK_(nullHandle));
1485 }
1486 // Should we check that there hasn't already been a synthetic attribute?
1487 access_flags.set_is_synthetic();
1488 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1489 if (method_attribute_length != 0) {
1490 classfile_parse_error(
1491 "Invalid Deprecated method attribute length %u in class file %s",
1492 method_attribute_length, CHECK_(nullHandle));
1493 }
1494 } else if (_major_version >= JAVA_1_5_VERSION) {
1495 if (method_attribute_name == vmSymbols::tag_signature()) {
1496 if (method_attribute_length != 2) {
1497 classfile_parse_error(
1498 "Invalid Signature attribute length %u in class file %s",
1499 method_attribute_length, CHECK_(nullHandle));
1500 }
1501 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1502 generic_signature_index = cfs->get_u2_fast();
1503 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1504 runtime_visible_annotations_length = method_attribute_length;
1505 runtime_visible_annotations = cfs->get_u1_buffer();
1506 assert(runtime_visible_annotations != NULL, "null visible annotations");
1507 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1508 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1509 runtime_invisible_annotations_length = method_attribute_length;
1510 runtime_invisible_annotations = cfs->get_u1_buffer();
1511 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1512 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1513 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1514 runtime_visible_parameter_annotations_length = method_attribute_length;
1515 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1516 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1517 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1518 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1519 runtime_invisible_parameter_annotations_length = method_attribute_length;
1520 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1521 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1522 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1523 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1524 annotation_default_length = method_attribute_length;
1525 annotation_default = cfs->get_u1_buffer();
1526 assert(annotation_default != NULL, "null annotation default");
1527 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1528 } else {
1529 // Skip unknown attributes
1530 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1531 }
1532 } else {
1533 // Skip unknown attributes
1534 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1535 }
1536 }
1537
1538 if (linenumber_table != NULL) {
1539 linenumber_table->write_terminator();
1540 linenumber_table_length = linenumber_table->position();
1541 }
1542
1543 // Make sure there's at least one Code attribute in non-native/non-abstract method
1544 if (_need_verify) {
1545 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1546 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1547 }
1548
1549 // All sizing information for a methodOop is finally available, now create it
1550 methodOop m_oop = oopFactory::new_method(
1551 code_length, access_flags, linenumber_table_length,
1552 total_lvt_length, checked_exceptions_length, CHECK_(nullHandle));
1553 methodHandle m (THREAD, m_oop);
1554
1555 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1556
1557 // Fill in information from fixed part (access_flags already set)
1558 m->set_constants(cp());
1559 m->set_name_index(name_index);
1560 m->set_signature_index(signature_index);
1561 m->set_generic_signature_index(generic_signature_index);
1562 #ifdef CC_INTERP
1563 // hmm is there a gc issue here??
1564 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1565 m->set_result_index(rtf.type());
1566 #endif
1567
1568 if (args_size >= 0) {
1569 m->set_size_of_parameters(args_size);
1570 } else {
1571 m->compute_size_of_parameters(THREAD);
1572 }
1573 #ifdef ASSERT
1574 if (args_size >= 0) {
1575 m->compute_size_of_parameters(THREAD);
1576 assert(args_size == m->size_of_parameters(), "");
1577 }
1578 #endif
1579
1580 // Fill in code attribute information
1581 m->set_max_stack(max_stack);
1582 m->set_max_locals(max_locals);
1583 m->constMethod()->set_stackmap_data(stackmap_data());
1584
1585 /**
1586 * The exception_table field is the flag used to indicate
1587 * that the methodOop and it's associated constMethodOop are partially
1588 * initialized and thus are exempt from pre/post GC verification. Once
1589 * the field is set, the oops are considered fully initialized so make
1590 * sure that the oops can pass verification when this field is set.
1591 */
1592 m->set_exception_table(exception_handlers());
1593
1594 // Copy byte codes
1595 if (code_length > 0) {
1596 memcpy(m->code_base(), code_start, code_length);
1597 }
1598
1599 // Copy line number table
1600 if (linenumber_table != NULL) {
1601 memcpy(m->compressed_linenumber_table(),
1602 linenumber_table->buffer(), linenumber_table_length);
1603 }
1604
1605 // Copy checked exceptions
1606 if (checked_exceptions_length > 0) {
1607 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1608 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1609 }
1610
1611 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1612 *
1613 * Rules for LVT's and LVTT's are:
1614 * - There can be any number of LVT's and LVTT's.
1615 * - If there are n LVT's, it is the same as if there was just
1616 * one LVT containing all the entries from the n LVT's.
1617 * - There may be no more than one LVT entry per local variable.
1618 * Two LVT entries are 'equal' if these fields are the same:
1619 * start_pc, length, name, slot
1620 * - There may be no more than one LVTT entry per each LVT entry.
1621 * Each LVTT entry has to match some LVT entry.
1622 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1623 */
1624 if (total_lvt_length > 0) {
1625 int tbl_no, idx;
1626
1627 promoted_flags->set_has_localvariable_table();
1628
1629 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1630 initialize_hashtable(lvt_Hash);
1631
1632 // To fill LocalVariableTable in
1633 Classfile_LVT_Element* cf_lvt;
1634 LocalVariableTableElement* lvt = m->localvariable_table_start();
1635
1636 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1637 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1638 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1639 copy_lvt_element(&cf_lvt[idx], lvt);
1640 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1641 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1642 && _need_verify
1643 && _major_version >= JAVA_1_5_VERSION ) {
1644 clear_hashtable(lvt_Hash);
1645 classfile_parse_error("Duplicated LocalVariableTable attribute "
1646 "entry for '%s' in class file %s",
1647 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1648 CHECK_(nullHandle));
1649 }
1650 }
1651 }
1652
1653 // To merge LocalVariableTable and LocalVariableTypeTable
1654 Classfile_LVT_Element* cf_lvtt;
1655 LocalVariableTableElement lvtt_elem;
1656
1657 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1658 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1659 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1660 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1661 int index = hash(&lvtt_elem);
1662 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1663 if (entry == NULL) {
1664 if (_need_verify) {
1665 clear_hashtable(lvt_Hash);
1666 classfile_parse_error("LVTT entry for '%s' in class file %s "
1667 "does not match any LVT entry",
1668 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1669 CHECK_(nullHandle));
1670 }
1671 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1672 clear_hashtable(lvt_Hash);
1673 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1674 "entry for '%s' in class file %s",
1675 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1676 CHECK_(nullHandle));
1677 } else {
1678 // to add generic signatures into LocalVariableTable
1679 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1680 }
1681 }
1682 }
1683 clear_hashtable(lvt_Hash);
1684 }
1685
1686 *method_annotations = assemble_annotations(runtime_visible_annotations,
1687 runtime_visible_annotations_length,
1688 runtime_invisible_annotations,
1689 runtime_invisible_annotations_length,
1690 CHECK_(nullHandle));
1691 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1692 runtime_visible_parameter_annotations_length,
1693 runtime_invisible_parameter_annotations,
1694 runtime_invisible_parameter_annotations_length,
1695 CHECK_(nullHandle));
1696 *method_default_annotations = assemble_annotations(annotation_default,
1697 annotation_default_length,
1698 NULL,
1699 0,
1700 CHECK_(nullHandle));
1701
1702 if (name() == vmSymbols::finalize_method_name() &&
1703 signature() == vmSymbols::void_method_signature()) {
1704 if (m->is_empty_method()) {
1705 _has_empty_finalizer = true;
1706 } else {
1707 _has_finalizer = true;
1708 }
1709 }
1710 if (name() == vmSymbols::object_initializer_name() &&
1711 signature() == vmSymbols::void_method_signature() &&
1712 m->is_vanilla_constructor()) {
1713 _has_vanilla_constructor = true;
1714 }
1715
1716 return m;
1717 }
1718
1719
1720 // The promoted_flags parameter is used to pass relevant access_flags
1721 // from the methods back up to the containing klass. These flag values
1722 // are added to klass's access_flags.
1723
1724 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1725 AccessFlags* promoted_flags,
1726 bool* has_final_method,
1727 objArrayOop* methods_annotations_oop,
1728 objArrayOop* methods_parameter_annotations_oop,
1729 objArrayOop* methods_default_annotations_oop,
1730 TRAPS) {
1731 ClassFileStream* cfs = stream();
1732 objArrayHandle nullHandle;
1733 typeArrayHandle method_annotations;
1734 typeArrayHandle method_parameter_annotations;
1735 typeArrayHandle method_default_annotations;
1736 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1737 u2 length = cfs->get_u2_fast();
1738 if (length == 0) {
1739 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1740 } else {
1741 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1742 objArrayHandle methods(THREAD, m);
1743 HandleMark hm(THREAD);
1744 objArrayHandle methods_annotations;
1745 objArrayHandle methods_parameter_annotations;
1746 objArrayHandle methods_default_annotations;
1747 for (int index = 0; index < length; index++) {
1748 methodHandle method = parse_method(cp, is_interface,
1749 promoted_flags,
1750 &method_annotations,
1751 &method_parameter_annotations,
1752 &method_default_annotations,
1753 CHECK_(nullHandle));
1754 if (method->is_final()) {
1755 *has_final_method = true;
1756 }
1757 methods->obj_at_put(index, method());
1758 if (method_annotations.not_null()) {
1759 if (methods_annotations.is_null()) {
1760 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1761 methods_annotations = objArrayHandle(THREAD, md);
1762 }
1763 methods_annotations->obj_at_put(index, method_annotations());
1764 }
1765 if (method_parameter_annotations.not_null()) {
1766 if (methods_parameter_annotations.is_null()) {
1767 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1768 methods_parameter_annotations = objArrayHandle(THREAD, md);
1769 }
1770 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1771 }
1772 if (method_default_annotations.not_null()) {
1773 if (methods_default_annotations.is_null()) {
1774 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1775 methods_default_annotations = objArrayHandle(THREAD, md);
1776 }
1777 methods_default_annotations->obj_at_put(index, method_default_annotations());
1778 }
1779 }
1780 if (_need_verify && length > 1) {
1781 // Check duplicated methods
1782 ResourceMark rm(THREAD);
1783 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1784 THREAD, NameSigHash*, HASH_ROW_SIZE);
1785 initialize_hashtable(names_and_sigs);
1786 bool dup = false;
1787 {
1788 debug_only(No_Safepoint_Verifier nsv;)
1789 for (int i = 0; i < length; i++) {
1790 methodOop m = (methodOop)methods->obj_at(i);
1791 // If no duplicates, add name/signature in hashtable names_and_sigs.
1792 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1793 dup = true;
1794 break;
1795 }
1796 }
1797 }
1798 if (dup) {
1799 classfile_parse_error("Duplicate method name&signature in class file %s",
1800 CHECK_(nullHandle));
1801 }
1802 }
1803
1804 *methods_annotations_oop = methods_annotations();
1805 *methods_parameter_annotations_oop = methods_parameter_annotations();
1806 *methods_default_annotations_oop = methods_default_annotations();
1807
1808 return methods;
1809 }
1810 }
1811
1812
1813 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1814 objArrayHandle methods_annotations,
1815 objArrayHandle methods_parameter_annotations,
1816 objArrayHandle methods_default_annotations,
1817 TRAPS) {
1818 typeArrayHandle nullHandle;
1819 int length = methods()->length();
1820 // If JVMTI original method ordering is enabled we have to
1821 // remember the original class file ordering.
1822 // We temporarily use the vtable_index field in the methodOop to store the
1823 // class file index, so we can read in after calling qsort.
1824 if (JvmtiExport::can_maintain_original_method_order()) {
1825 for (int index = 0; index < length; index++) {
1826 methodOop m = methodOop(methods->obj_at(index));
1827 assert(!m->valid_vtable_index(), "vtable index should not be set");
1828 m->set_vtable_index(index);
1829 }
1830 }
1831 // Sort method array by ascending method name (for faster lookups & vtable construction)
1832 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1833 methodOopDesc::sort_methods(methods(),
1834 methods_annotations(),
1835 methods_parameter_annotations(),
1836 methods_default_annotations());
1837
1838 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1839 if (JvmtiExport::can_maintain_original_method_order()) {
1840 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1841 typeArrayHandle method_ordering(THREAD, new_ordering);
1842 for (int index = 0; index < length; index++) {
1843 methodOop m = methodOop(methods->obj_at(index));
1844 int old_index = m->vtable_index();
1845 assert(old_index >= 0 && old_index < length, "invalid method index");
1846 method_ordering->int_at_put(index, old_index);
1847 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1848 }
1849 return method_ordering;
1850 } else {
1851 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1852 }
1853 }
1854
1855
1856 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1857 ClassFileStream* cfs = stream();
1858 cfs->guarantee_more(2, CHECK); // sourcefile_index
1859 u2 sourcefile_index = cfs->get_u2_fast();
1860 check_property(
1861 valid_cp_range(sourcefile_index, cp->length()) &&
1862 cp->tag_at(sourcefile_index).is_utf8(),
1863 "Invalid SourceFile attribute at constant pool index %u in class file %s",
1864 sourcefile_index, CHECK);
1865 k->set_source_file_name(cp->symbol_at(sourcefile_index));
1866 }
1867
1868
1869
1870 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
1871 instanceKlassHandle k,
1872 int length, TRAPS) {
1873 ClassFileStream* cfs = stream();
1874 u1* sde_buffer = cfs->get_u1_buffer();
1875 assert(sde_buffer != NULL, "null sde buffer");
1876
1877 // Don't bother storing it if there is no way to retrieve it
1878 if (JvmtiExport::can_get_source_debug_extension()) {
1879 // Optimistically assume that only 1 byte UTF format is used
1880 // (common case)
1881 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
1882 length, CHECK);
1883 k->set_source_debug_extension(sde_symbol);
1884 }
1885 // Got utf8 string, set stream position forward
1886 cfs->skip_u1(length, CHECK);
1887 }
1888
1889
1890 // Inner classes can be static, private or protected (classic VM does this)
1891 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
1892
1893 // Return number of classes in the inner classes attribute table
1894 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1895 ClassFileStream* cfs = stream();
1896 cfs->guarantee_more(2, CHECK_0); // length
1897 u2 length = cfs->get_u2_fast();
1898
1899 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
1900 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
1901 typeArrayHandle inner_classes(THREAD, ic);
1902 int index = 0;
1903 int cp_size = cp->length();
1904 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
1905 for (int n = 0; n < length; n++) {
1906 // Inner class index
1907 u2 inner_class_info_index = cfs->get_u2_fast();
1908 check_property(
1909 inner_class_info_index == 0 ||
1910 (valid_cp_range(inner_class_info_index, cp_size) &&
1911 cp->tag_at(inner_class_info_index).is_klass_reference()),
1912 "inner_class_info_index %u has bad constant type in class file %s",
1913 inner_class_info_index, CHECK_0);
1914 // Outer class index
1915 u2 outer_class_info_index = cfs->get_u2_fast();
1916 check_property(
1917 outer_class_info_index == 0 ||
1918 (valid_cp_range(outer_class_info_index, cp_size) &&
1919 cp->tag_at(outer_class_info_index).is_klass_reference()),
1920 "outer_class_info_index %u has bad constant type in class file %s",
1921 outer_class_info_index, CHECK_0);
1922 // Inner class name
1923 u2 inner_name_index = cfs->get_u2_fast();
1924 check_property(
1925 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
1926 cp->tag_at(inner_name_index).is_utf8()),
1927 "inner_name_index %u has bad constant type in class file %s",
1928 inner_name_index, CHECK_0);
1929 if (_need_verify) {
1930 guarantee_property(inner_class_info_index != outer_class_info_index,
1931 "Class is both outer and inner class in class file %s", CHECK_0);
1932 }
1933 // Access flags
1934 AccessFlags inner_access_flags;
1935 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
1936 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
1937 // Set abstract bit for old class files for backward compatibility
1938 flags |= JVM_ACC_ABSTRACT;
1939 }
1940 verify_legal_class_modifiers(flags, CHECK_0);
1941 inner_access_flags.set_flags(flags);
1942
1943 inner_classes->short_at_put(index++, inner_class_info_index);
1944 inner_classes->short_at_put(index++, outer_class_info_index);
1945 inner_classes->short_at_put(index++, inner_name_index);
1946 inner_classes->short_at_put(index++, inner_access_flags.as_short());
1947 }
1948
1949 // 4347400: make sure there's no duplicate entry in the classes array
1950 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
1951 for(int i = 0; i < inner_classes->length(); i += 4) {
1952 for(int j = i + 4; j < inner_classes->length(); j += 4) {
1953 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
1954 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
1955 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
1956 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
1957 "Duplicate entry in InnerClasses in class file %s",
1958 CHECK_0);
1959 }
1960 }
1961 }
1962
1963 // Update instanceKlass with inner class info.
1964 k->set_inner_classes(inner_classes());
1965 return length;
1966 }
1967
1968 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1969 k->set_is_synthetic();
1970 }
1971
1972 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1973 ClassFileStream* cfs = stream();
1974 u2 signature_index = cfs->get_u2(CHECK);
1975 check_property(
1976 valid_cp_range(signature_index, cp->length()) &&
1977 cp->tag_at(signature_index).is_utf8(),
1978 "Invalid constant pool index %u in Signature attribute in class file %s",
1979 signature_index, CHECK);
1980 k->set_generic_signature(cp->symbol_at(signature_index));
1981 }
1982
1983 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1984 ClassFileStream* cfs = stream();
1985 // Set inner classes attribute to default sentinel
1986 k->set_inner_classes(Universe::the_empty_short_array());
1987 cfs->guarantee_more(2, CHECK); // attributes_count
1988 u2 attributes_count = cfs->get_u2_fast();
1989 bool parsed_sourcefile_attribute = false;
1990 bool parsed_innerclasses_attribute = false;
1991 bool parsed_enclosingmethod_attribute = false;
1992 u1* runtime_visible_annotations = NULL;
1993 int runtime_visible_annotations_length = 0;
1994 u1* runtime_invisible_annotations = NULL;
1995 int runtime_invisible_annotations_length = 0;
1996 // Iterate over attributes
1997 while (attributes_count--) {
1998 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1999 u2 attribute_name_index = cfs->get_u2_fast();
2000 u4 attribute_length = cfs->get_u4_fast();
2001 check_property(
2002 valid_cp_range(attribute_name_index, cp->length()) &&
2003 cp->tag_at(attribute_name_index).is_utf8(),
2004 "Attribute name has bad constant pool index %u in class file %s",
2005 attribute_name_index, CHECK);
2006 symbolOop tag = cp->symbol_at(attribute_name_index);
2007 if (tag == vmSymbols::tag_source_file()) {
2008 // Check for SourceFile tag
2009 if (_need_verify) {
2010 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2011 }
2012 if (parsed_sourcefile_attribute) {
2013 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2014 } else {
2015 parsed_sourcefile_attribute = true;
2016 }
2017 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2018 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2019 // Check for SourceDebugExtension tag
2020 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2021 } else if (tag == vmSymbols::tag_inner_classes()) {
2022 // Check for InnerClasses tag
2023 if (parsed_innerclasses_attribute) {
2024 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2025 } else {
2026 parsed_innerclasses_attribute = true;
2027 }
2028 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2029 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2030 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2031 "Wrong InnerClasses attribute length in class file %s", CHECK);
2032 }
2033 } else if (tag == vmSymbols::tag_synthetic()) {
2034 // Check for Synthetic tag
2035 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2036 if (attribute_length != 0) {
2037 classfile_parse_error(
2038 "Invalid Synthetic classfile attribute length %u in class file %s",
2039 attribute_length, CHECK);
2040 }
2041 parse_classfile_synthetic_attribute(cp, k, CHECK);
2042 } else if (tag == vmSymbols::tag_deprecated()) {
2043 // Check for Deprecatd tag - 4276120
2044 if (attribute_length != 0) {
2045 classfile_parse_error(
2046 "Invalid Deprecated classfile attribute length %u in class file %s",
2047 attribute_length, CHECK);
2048 }
2049 } else if (_major_version >= JAVA_1_5_VERSION) {
2050 if (tag == vmSymbols::tag_signature()) {
2051 if (attribute_length != 2) {
2052 classfile_parse_error(
2053 "Wrong Signature attribute length %u in class file %s",
2054 attribute_length, CHECK);
2055 }
2056 parse_classfile_signature_attribute(cp, k, CHECK);
2057 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2058 runtime_visible_annotations_length = attribute_length;
2059 runtime_visible_annotations = cfs->get_u1_buffer();
2060 assert(runtime_visible_annotations != NULL, "null visible annotations");
2061 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2062 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2063 runtime_invisible_annotations_length = attribute_length;
2064 runtime_invisible_annotations = cfs->get_u1_buffer();
2065 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2066 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2067 } else if (tag == vmSymbols::tag_enclosing_method()) {
2068 if (parsed_enclosingmethod_attribute) {
2069 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2070 } else {
2071 parsed_enclosingmethod_attribute = true;
2072 }
2073 cfs->guarantee_more(4, CHECK); // class_index, method_index
2074 u2 class_index = cfs->get_u2_fast();
2075 u2 method_index = cfs->get_u2_fast();
2076 if (class_index == 0) {
2077 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2078 }
2079 // Validate the constant pool indices and types
2080 if (!cp->is_within_bounds(class_index) ||
2081 !cp->tag_at(class_index).is_klass_reference()) {
2082 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2083 }
2084 if (method_index != 0 &&
2085 (!cp->is_within_bounds(method_index) ||
2086 !cp->tag_at(method_index).is_name_and_type())) {
2087 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2088 }
2089 k->set_enclosing_method_indices(class_index, method_index);
2090 } else {
2091 // Unknown attribute
2092 cfs->skip_u1(attribute_length, CHECK);
2093 }
2094 } else {
2095 // Unknown attribute
2096 cfs->skip_u1(attribute_length, CHECK);
2097 }
2098 }
2099 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2100 runtime_visible_annotations_length,
2101 runtime_invisible_annotations,
2102 runtime_invisible_annotations_length,
2103 CHECK);
2104 k->set_class_annotations(annotations());
2105 }
2106
2107
2108 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2109 int runtime_visible_annotations_length,
2110 u1* runtime_invisible_annotations,
2111 int runtime_invisible_annotations_length, TRAPS) {
2112 typeArrayHandle annotations;
2113 if (runtime_visible_annotations != NULL ||
2114 runtime_invisible_annotations != NULL) {
2115 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2116 runtime_invisible_annotations_length, CHECK_(annotations));
2117 annotations = typeArrayHandle(THREAD, anno);
2118 if (runtime_visible_annotations != NULL) {
2119 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2120 }
2121 if (runtime_invisible_annotations != NULL) {
2122 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2123 }
2124 }
2125 return annotations;
2126 }
2127
2128
2129 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2130 KlassHandle h_k (THREAD, fd->field_holder());
2131 assert(h_k.not_null() && fd->is_static(), "just checking");
2132 if (fd->has_initial_value()) {
2133 BasicType t = fd->field_type();
2134 switch (t) {
2135 case T_BYTE:
2136 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2137 break;
2138 case T_BOOLEAN:
2139 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2140 break;
2141 case T_CHAR:
2142 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2143 break;
2144 case T_SHORT:
2145 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2146 break;
2147 case T_INT:
2148 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2149 break;
2150 case T_FLOAT:
2151 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2152 break;
2153 case T_DOUBLE:
2154 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2155 break;
2156 case T_LONG:
2157 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2158 break;
2159 case T_OBJECT:
2160 {
2161 #ifdef ASSERT
2162 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2163 assert(fd->signature() == sym, "just checking");
2164 #endif
2165 oop string = fd->string_initial_value(CHECK);
2166 h_k()->obj_field_put(fd->offset(), string);
2167 }
2168 break;
2169 default:
2170 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2171 "Illegal ConstantValue attribute in class file");
2172 }
2173 }
2174 }
2175
2176
2177 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2178 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2179 // This code is for compatibility with earlier jdk's that do not
2180 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2181 // the check for the "discovered" field should issue a warning if
2182 // the field is not found. For 1.6 this code should be issue a
2183 // fatal error if the "discovered" field is not found.
2184 //
2185 // Increment fac.nonstatic_oop_count so that the start of the
2186 // next type of non-static oops leaves room for the fake oop.
2187 // Do not increment next_nonstatic_oop_offset so that the
2188 // fake oop is place after the java.lang.ref.Reference oop
2189 // fields.
2190 //
2191 // Check the fields in java.lang.ref.Reference for the "discovered"
2192 // field. If it is not present, artifically create a field for it.
2193 // This allows this VM to run on early JDK where the field is not
2194 // present.
2195
2196 //
2197 // Increment fac.nonstatic_oop_count so that the start of the
2198 // next type of non-static oops leaves room for the fake oop.
2199 // Do not increment next_nonstatic_oop_offset so that the
2200 // fake oop is place after the java.lang.ref.Reference oop
2201 // fields.
2202 //
2203 // Check the fields in java.lang.ref.Reference for the "discovered"
2204 // field. If it is not present, artifically create a field for it.
2205 // This allows this VM to run on early JDK where the field is not
2206 // present.
2207 int reference_sig_index = 0;
2208 int reference_name_index = 0;
2209 int reference_index = 0;
2210 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2211 const int n = (*fields_ptr)()->length();
2212 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2213 int name_index =
2214 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2215 int sig_index =
2216 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2217 symbolOop f_name = cp->symbol_at(name_index);
2218 symbolOop f_sig = cp->symbol_at(sig_index);
2219 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2220 // Save the index for reference signature for later use.
2221 // The fake discovered field does not entries in the
2222 // constant pool so the index for its signature cannot
2223 // be extracted from the constant pool. It will need
2224 // later, however. It's signature is vmSymbols::reference_signature()
2225 // so same an index for that signature.
2226 reference_sig_index = sig_index;
2227 reference_name_index = name_index;
2228 reference_index = i;
2229 }
2230 if (f_name == vmSymbols::reference_discovered_name() &&
2231 f_sig == vmSymbols::reference_signature()) {
2232 // The values below are fake but will force extra
2233 // non-static oop fields and a corresponding non-static
2234 // oop map block to be allocated.
2235 extra = 0;
2236 break;
2237 }
2238 }
2239 if (extra != 0) {
2240 fac_ptr->nonstatic_oop_count += extra;
2241 // Add the additional entry to "fields" so that the klass
2242 // contains the "discoverd" field and the field will be initialized
2243 // in instances of the object.
2244 int fields_with_fix_length = (*fields_ptr)()->length() +
2245 instanceKlass::next_offset;
2246 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2247 fields_with_fix_length, CHECK);
2248 typeArrayHandle fields_with_fix(THREAD, ff);
2249
2250 // Take everything from the original but the length.
2251 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2252 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2253 }
2254
2255 // Add the fake field at the end.
2256 int i = (*fields_ptr)->length();
2257 // There is no name index for the fake "discovered" field nor
2258 // signature but a signature is needed so that the field will
2259 // be properly initialized. Use one found for
2260 // one of the other reference fields. Be sure the index for the
2261 // name is 0. In fieldDescriptor::initialize() the index of the
2262 // name is checked. That check is by passed for the last nonstatic
2263 // oop field in a java.lang.ref.Reference which is assumed to be
2264 // this artificial "discovered" field. An assertion checks that
2265 // the name index is 0.
2266 assert(reference_index != 0, "Missing signature for reference");
2267
2268 int j;
2269 for (j = 0; j < instanceKlass::next_offset; j++) {
2270 fields_with_fix->ushort_at_put(i + j,
2271 (*fields_ptr)->ushort_at(reference_index +j));
2272 }
2273 // Clear the public access flag and set the private access flag.
2274 short flags;
2275 flags =
2276 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2277 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2278 flags = flags & (~JVM_ACC_PUBLIC);
2279 flags = flags | JVM_ACC_PRIVATE;
2280 AccessFlags access_flags;
2281 access_flags.set_flags(flags);
2282 assert(!access_flags.is_public(), "Failed to clear public flag");
2283 assert(access_flags.is_private(), "Failed to set private flag");
2284 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2285 flags);
2286
2287 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2288 == reference_name_index, "The fake reference name is incorrect");
2289 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2290 == reference_sig_index, "The fake reference signature is incorrect");
2291 // The type of the field is stored in the low_offset entry during
2292 // parsing.
2293 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2294 NONSTATIC_OOP, "The fake reference type is incorrect");
2295
2296 // "fields" is allocated in the permanent generation. Disgard
2297 // it and let it be collected.
2298 (*fields_ptr) = fields_with_fix;
2299 }
2300 return;
2301 }
2302
2303
2304 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2305 FieldAllocationCount *fac_ptr, TRAPS) {
2306 // Add fake fields for java.lang.Class instances
2307 //
2308 // This is not particularly nice. We should consider adding a
2309 // private transient object field at the Java level to
2310 // java.lang.Class. Alternatively we could add a subclass of
2311 // instanceKlass which provides an accessor and size computer for
2312 // this field, but that appears to be more code than this hack.
2313 //
2314 // NOTE that we wedge these in at the beginning rather than the
2315 // end of the object because the Class layout changed between JDK
2316 // 1.3 and JDK 1.4 with the new reflection implementation; some
2317 // nonstatic oop fields were added at the Java level. The offsets
2318 // of these fake fields can't change between these two JDK
2319 // versions because when the offsets are computed at bootstrap
2320 // time we don't know yet which version of the JDK we're running in.
2321
2322 // The values below are fake but will force two non-static oop fields and
2323 // a corresponding non-static oop map block to be allocated.
2324 const int extra = java_lang_Class::number_of_fake_oop_fields;
2325 fac_ptr->nonstatic_oop_count += extra;
2326 }
2327
2328
2329 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2330 // Cause the extra fake fields in java.lang.Class to show up before
2331 // the Java fields for layout compatibility between 1.3 and 1.4
2332 // Incrementing next_nonstatic_oop_offset here advances the
2333 // location where the real java fields are placed.
2334 const int extra = java_lang_Class::number_of_fake_oop_fields;
2335 (*next_nonstatic_oop_offset_ptr) += (extra * wordSize);
2336 }
2337
2338
2339 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2340 Handle class_loader,
2341 Handle protection_domain,
2342 symbolHandle& parsed_name,
2343 TRAPS) {
2344 // So that JVMTI can cache class file in the state before retransformable agents
2345 // have modified it
2346 unsigned char *cached_class_file_bytes = NULL;
2347 jint cached_class_file_length;
2348
2349 ClassFileStream* cfs = stream();
2350 // Timing
2351 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time());
2352
2353 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2354
2355 if (JvmtiExport::should_post_class_file_load_hook()) {
2356 unsigned char* ptr = cfs->buffer();
2357 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2358
2359 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2360 &ptr, &end_ptr,
2361 &cached_class_file_bytes,
2362 &cached_class_file_length);
2363
2364 if (ptr != cfs->buffer()) {
2365 // JVMTI agent has modified class file data.
2366 // Set new class file stream using JVMTI agent modified
2367 // class file data.
2368 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2369 set_stream(cfs);
2370 }
2371 }
2372
2373
2374 instanceKlassHandle nullHandle;
2375
2376 // Figure out whether we can skip format checking (matching classic VM behavior)
2377 _need_verify = Verifier::should_verify_for(class_loader());
2378
2379 // Set the verify flag in stream
2380 cfs->set_verify(_need_verify);
2381
2382 // Save the class file name for easier error message printing.
2383 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2384
2385 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2386 // Magic value
2387 u4 magic = cfs->get_u4_fast();
2388 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2389 "Incompatible magic value %u in class file %s",
2390 magic, CHECK_(nullHandle));
2391
2392 // Version numbers
2393 u2 minor_version = cfs->get_u2_fast();
2394 u2 major_version = cfs->get_u2_fast();
2395
2396 // Check version numbers - we check this even with verifier off
2397 if (!is_supported_version(major_version, minor_version)) {
2398 if (name.is_null()) {
2399 Exceptions::fthrow(
2400 THREAD_AND_LOCATION,
2401 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2402 "Unsupported major.minor version %u.%u",
2403 major_version,
2404 minor_version);
2405 } else {
2406 ResourceMark rm(THREAD);
2407 Exceptions::fthrow(
2408 THREAD_AND_LOCATION,
2409 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2410 "%s : Unsupported major.minor version %u.%u",
2411 name->as_C_string(),
2412 major_version,
2413 minor_version);
2414 }
2415 return nullHandle;
2416 }
2417
2418 _major_version = major_version;
2419 _minor_version = minor_version;
2420
2421
2422 // Check if verification needs to be relaxed for this class file
2423 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2424 _relax_verify = Verifier::relax_verify_for(class_loader());
2425
2426 // Constant pool
2427 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2428 int cp_size = cp->length();
2429
2430 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2431
2432 // Access flags
2433 AccessFlags access_flags;
2434 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2435
2436 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2437 // Set abstract bit for old class files for backward compatibility
2438 flags |= JVM_ACC_ABSTRACT;
2439 }
2440 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2441 access_flags.set_flags(flags);
2442
2443 // This class and superclass
2444 instanceKlassHandle super_klass;
2445 u2 this_class_index = cfs->get_u2_fast();
2446 check_property(
2447 valid_cp_range(this_class_index, cp_size) &&
2448 cp->tag_at(this_class_index).is_unresolved_klass(),
2449 "Invalid this class index %u in constant pool in class file %s",
2450 this_class_index, CHECK_(nullHandle));
2451
2452 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2453 assert(class_name.not_null(), "class_name can't be null");
2454
2455 // It's important to set parsed_name *before* resolving the super class.
2456 // (it's used for cleanup by the caller if parsing fails)
2457 parsed_name = class_name;
2458
2459 // Update _class_name which could be null previously to be class_name
2460 _class_name = class_name;
2461
2462 // Don't need to check whether this class name is legal or not.
2463 // It has been checked when constant pool is parsed.
2464 // However, make sure it is not an array type.
2465 if (_need_verify) {
2466 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2467 "Bad class name in class file %s",
2468 CHECK_(nullHandle));
2469 }
2470
2471 klassOop preserve_this_klass; // for storing result across HandleMark
2472
2473 // release all handles when parsing is done
2474 { HandleMark hm(THREAD);
2475
2476 // Checks if name in class file matches requested name
2477 if (name.not_null() && class_name() != name()) {
2478 ResourceMark rm(THREAD);
2479 Exceptions::fthrow(
2480 THREAD_AND_LOCATION,
2481 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2482 "%s (wrong name: %s)",
2483 name->as_C_string(),
2484 class_name->as_C_string()
2485 );
2486 return nullHandle;
2487 }
2488
2489 if (TraceClassLoadingPreorder) {
2490 tty->print("[Loading %s", name()->as_klass_external_name());
2491 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2492 tty->print_cr("]");
2493 }
2494
2495 u2 super_class_index = cfs->get_u2_fast();
2496 if (super_class_index == 0) {
2497 check_property(class_name() == vmSymbols::java_lang_Object(),
2498 "Invalid superclass index %u in class file %s",
2499 super_class_index,
2500 CHECK_(nullHandle));
2501 } else {
2502 check_property(valid_cp_range(super_class_index, cp_size) &&
2503 cp->tag_at(super_class_index).is_unresolved_klass(),
2504 "Invalid superclass index %u in class file %s",
2505 super_class_index,
2506 CHECK_(nullHandle));
2507 // The class name should be legal because it is checked when parsing constant pool.
2508 // However, make sure it is not an array type.
2509 if (_need_verify) {
2510 guarantee_property(cp->unresolved_klass_at(super_class_index)->byte_at(0) != JVM_SIGNATURE_ARRAY,
2511 "Bad superclass name in class file %s", CHECK_(nullHandle));
2512 }
2513 }
2514
2515 // Interfaces
2516 u2 itfs_len = cfs->get_u2_fast();
2517 objArrayHandle local_interfaces;
2518 if (itfs_len == 0) {
2519 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2520 } else {
2521 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle));
2522 }
2523
2524 // Fields (offsets are filled in later)
2525 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2526 objArrayHandle fields_annotations;
2527 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2528 // Methods
2529 bool has_final_method = false;
2530 AccessFlags promoted_flags;
2531 promoted_flags.set_flags(0);
2532 // These need to be oop pointers because they are allocated lazily
2533 // inside parse_methods inside a nested HandleMark
2534 objArrayOop methods_annotations_oop = NULL;
2535 objArrayOop methods_parameter_annotations_oop = NULL;
2536 objArrayOop methods_default_annotations_oop = NULL;
2537 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2538 &promoted_flags,
2539 &has_final_method,
2540 &methods_annotations_oop,
2541 &methods_parameter_annotations_oop,
2542 &methods_default_annotations_oop,
2543 CHECK_(nullHandle));
2544
2545 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2546 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2547 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2548
2549 // We check super class after class file is parsed and format is checked
2550 if (super_class_index > 0) {
2551 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2552 if (access_flags.is_interface()) {
2553 // Before attempting to resolve the superclass, check for class format
2554 // errors not checked yet.
2555 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2556 "Interfaces must have java.lang.Object as superclass in class file %s",
2557 CHECK_(nullHandle));
2558 }
2559 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2560 sk,
2561 class_loader,
2562 protection_domain,
2563 true,
2564 CHECK_(nullHandle));
2565 KlassHandle kh (THREAD, k);
2566 super_klass = instanceKlassHandle(THREAD, kh());
2567 if (super_klass->is_interface()) {
2568 ResourceMark rm(THREAD);
2569 Exceptions::fthrow(
2570 THREAD_AND_LOCATION,
2571 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2572 "class %s has interface %s as super class",
2573 class_name->as_klass_external_name(),
2574 super_klass->external_name()
2575 );
2576 return nullHandle;
2577 }
2578 // Make sure super class is not final
2579 if (super_klass->is_final()) {
2580 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2581 }
2582 }
2583
2584 // Compute the transitive list of all unique interfaces implemented by this class
2585 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2586
2587 // sort methods
2588 typeArrayHandle method_ordering = sort_methods(methods,
2589 methods_annotations,
2590 methods_parameter_annotations,
2591 methods_default_annotations,
2592 CHECK_(nullHandle));
2593
2594 // promote flags from parse_methods() to the klass' flags
2595 access_flags.add_promoted_flags(promoted_flags.as_int());
2596
2597 // Size of Java vtable (in words)
2598 int vtable_size = 0;
2599 int itable_size = 0;
2600 int num_miranda_methods = 0;
2601
2602 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2603 num_miranda_methods,
2604 super_klass(),
2605 methods(),
2606 access_flags,
2607 class_loader(),
2608 class_name(),
2609 local_interfaces());
2610
2611 // Size of Java itable (in words)
2612 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2613
2614 // Field size and offset computation
2615 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2616 #ifndef PRODUCT
2617 int orig_nonstatic_field_size = 0;
2618 #endif
2619 int static_field_size = 0;
2620 int next_static_oop_offset;
2621 int next_static_double_offset;
2622 int next_static_word_offset;
2623 int next_static_short_offset;
2624 int next_static_byte_offset;
2625 int next_static_type_offset;
2626 int next_nonstatic_oop_offset;
2627 int next_nonstatic_double_offset;
2628 int next_nonstatic_word_offset;
2629 int next_nonstatic_short_offset;
2630 int next_nonstatic_byte_offset;
2631 int next_nonstatic_type_offset;
2632 int first_nonstatic_oop_offset;
2633 int first_nonstatic_field_offset;
2634 int next_nonstatic_field_offset;
2635
2636 // Calculate the starting byte offsets
2637 next_static_oop_offset = (instanceKlass::header_size() +
2638 align_object_offset(vtable_size) +
2639 align_object_offset(itable_size)) * wordSize;
2640 next_static_double_offset = next_static_oop_offset +
2641 (fac.static_oop_count * oopSize);
2642 if ( fac.static_double_count &&
2643 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2644 Universe::field_type_should_be_aligned(T_LONG)) ) {
2645 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2646 }
2647
2648 next_static_word_offset = next_static_double_offset +
2649 (fac.static_double_count * BytesPerLong);
2650 next_static_short_offset = next_static_word_offset +
2651 (fac.static_word_count * BytesPerInt);
2652 next_static_byte_offset = next_static_short_offset +
2653 (fac.static_short_count * BytesPerShort);
2654 next_static_type_offset = align_size_up((next_static_byte_offset +
2655 fac.static_byte_count ), wordSize );
2656 static_field_size = (next_static_type_offset -
2657 next_static_oop_offset) / wordSize;
2658 first_nonstatic_field_offset = (instanceOopDesc::header_size() +
2659 nonstatic_field_size) * wordSize;
2660 next_nonstatic_field_offset = first_nonstatic_field_offset;
2661
2662 // Add fake fields for java.lang.Class instances (also see below)
2663 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2664 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2665 }
2666
2667 // Add a fake "discovered" field if it is not present
2668 // for compatibility with earlier jdk's.
2669 if (class_name() == vmSymbols::java_lang_ref_Reference()
2670 && class_loader.is_null()) {
2671 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2672 }
2673 // end of "discovered" field compactibility fix
2674
2675 int nonstatic_double_count = fac.nonstatic_double_count;
2676 int nonstatic_word_count = fac.nonstatic_word_count;
2677 int nonstatic_short_count = fac.nonstatic_short_count;
2678 int nonstatic_byte_count = fac.nonstatic_byte_count;
2679 int nonstatic_oop_count = fac.nonstatic_oop_count;
2680
2681 // Prepare list of oops for oop maps generation.
2682 u2* nonstatic_oop_offsets;
2683 u2* nonstatic_oop_length;
2684 int nonstatic_oop_map_count = 0;
2685
2686 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2687 THREAD, u2, nonstatic_oop_count+1);
2688 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2689 THREAD, u2, nonstatic_oop_count+1);
2690
2691 // Add fake fields for java.lang.Class instances (also see above).
2692 // FieldsAllocationStyle and CompactFields values will be reset to default.
2693 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2694 java_lang_Class_fix_post(&next_nonstatic_field_offset);
2695 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset;
2696 int fake_oop_count = (( next_nonstatic_field_offset -
2697 first_nonstatic_field_offset ) / oopSize);
2698 nonstatic_oop_length [0] = (u2)fake_oop_count;
2699 nonstatic_oop_map_count = 1;
2700 nonstatic_oop_count -= fake_oop_count;
2701 first_nonstatic_oop_offset = first_nonstatic_field_offset;
2702 } else {
2703 first_nonstatic_oop_offset = 0; // will be set for first oop field
2704 }
2705
2706 #ifndef PRODUCT
2707 if( PrintCompactFieldsSavings ) {
2708 next_nonstatic_double_offset = next_nonstatic_field_offset +
2709 (nonstatic_oop_count * oopSize);
2710 if ( nonstatic_double_count > 0 ) {
2711 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2712 }
2713 next_nonstatic_word_offset = next_nonstatic_double_offset +
2714 (nonstatic_double_count * BytesPerLong);
2715 next_nonstatic_short_offset = next_nonstatic_word_offset +
2716 (nonstatic_word_count * BytesPerInt);
2717 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2718 (nonstatic_short_count * BytesPerShort);
2719 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
2720 nonstatic_byte_count ), wordSize );
2721 orig_nonstatic_field_size = nonstatic_field_size +
2722 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/wordSize);
2723 }
2724 #endif
2725 bool compact_fields = CompactFields;
2726 int allocation_style = FieldsAllocationStyle;
2727 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range?
2728 assert(false, "0 <= FieldsAllocationStyle <= 1");
2729 allocation_style = 1; // Optimistic
2730 }
2731
2732 // The next classes have predefined hard-coded fields offsets
2733 // (see in JavaClasses::compute_hard_coded_offsets()).
2734 // Use default fields allocation order for them.
2735 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2736 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2737 class_name() == vmSymbols::java_lang_Class() ||
2738 class_name() == vmSymbols::java_lang_ClassLoader() ||
2739 class_name() == vmSymbols::java_lang_ref_Reference() ||
2740 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2741 class_name() == vmSymbols::java_lang_StackTraceElement() ||
2742 class_name() == vmSymbols::java_lang_String() ||
2743 class_name() == vmSymbols::java_lang_Throwable()) ) {
2744 allocation_style = 0; // Allocate oops first
2745 compact_fields = false; // Don't compact fields
2746 }
2747
2748 if( allocation_style == 0 ) {
2749 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2750 next_nonstatic_oop_offset = next_nonstatic_field_offset;
2751 next_nonstatic_double_offset = next_nonstatic_oop_offset +
2752 (nonstatic_oop_count * oopSize);
2753 } else if( allocation_style == 1 ) {
2754 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
2755 next_nonstatic_double_offset = next_nonstatic_field_offset;
2756 } else {
2757 ShouldNotReachHere();
2758 }
2759
2760 int nonstatic_oop_space_count = 0;
2761 int nonstatic_word_space_count = 0;
2762 int nonstatic_short_space_count = 0;
2763 int nonstatic_byte_space_count = 0;
2764 int nonstatic_oop_space_offset;
2765 int nonstatic_word_space_offset;
2766 int nonstatic_short_space_offset;
2767 int nonstatic_byte_space_offset;
2768
2769 if( nonstatic_double_count > 0 ) {
2770 int offset = next_nonstatic_double_offset;
2771 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
2772 if( compact_fields && offset != next_nonstatic_double_offset ) {
2773 // Allocate available fields into the gap before double field.
2774 int length = next_nonstatic_double_offset - offset;
2775 assert(length == BytesPerInt, "");
2776 nonstatic_word_space_offset = offset;
2777 if( nonstatic_word_count > 0 ) {
2778 nonstatic_word_count -= 1;
2779 nonstatic_word_space_count = 1; // Only one will fit
2780 length -= BytesPerInt;
2781 offset += BytesPerInt;
2782 }
2783 nonstatic_short_space_offset = offset;
2784 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
2785 nonstatic_short_count -= 1;
2786 nonstatic_short_space_count += 1;
2787 length -= BytesPerShort;
2788 offset += BytesPerShort;
2789 }
2790 nonstatic_byte_space_offset = offset;
2791 while( length > 0 && nonstatic_byte_count > 0 ) {
2792 nonstatic_byte_count -= 1;
2793 nonstatic_byte_space_count += 1;
2794 length -= 1;
2795 }
2796 // Allocate oop field in the gap if there are no other fields for that.
2797 nonstatic_oop_space_offset = offset;
2798 if( length >= oopSize && nonstatic_oop_count > 0 &&
2799 allocation_style != 0 ) { // when oop fields not first
2800 nonstatic_oop_count -= 1;
2801 nonstatic_oop_space_count = 1; // Only one will fit
2802 length -= oopSize;
2803 offset += oopSize;
2804 }
2805 }
2806 }
2807
2808 next_nonstatic_word_offset = next_nonstatic_double_offset +
2809 (nonstatic_double_count * BytesPerLong);
2810 next_nonstatic_short_offset = next_nonstatic_word_offset +
2811 (nonstatic_word_count * BytesPerInt);
2812 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2813 (nonstatic_short_count * BytesPerShort);
2814
2815 int notaligned_offset;
2816 if( allocation_style == 0 ) {
2817 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2818 } else { // allocation_style == 1
2819 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2820 if( nonstatic_oop_count > 0 ) {
2821 notaligned_offset = next_nonstatic_oop_offset;
2822 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, oopSize);
2823 }
2824 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * oopSize);
2825 }
2826 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
2827 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
2828 - first_nonstatic_field_offset)/wordSize);
2829
2830 // Iterate over fields again and compute correct offsets.
2831 // The field allocation type was temporarily stored in the offset slot.
2832 // oop fields are located before non-oop fields (static and non-static).
2833 int len = fields->length();
2834 for (int i = 0; i < len; i += instanceKlass::next_offset) {
2835 int real_offset;
2836 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4);
2837 switch (atype) {
2838 case STATIC_OOP:
2839 real_offset = next_static_oop_offset;
2840 next_static_oop_offset += oopSize;
2841 break;
2842 case STATIC_BYTE:
2843 real_offset = next_static_byte_offset;
2844 next_static_byte_offset += 1;
2845 break;
2846 case STATIC_SHORT:
2847 real_offset = next_static_short_offset;
2848 next_static_short_offset += BytesPerShort;
2849 break;
2850 case STATIC_WORD:
2851 real_offset = next_static_word_offset;
2852 next_static_word_offset += BytesPerInt;
2853 break;
2854 case STATIC_ALIGNED_DOUBLE:
2855 case STATIC_DOUBLE:
2856 real_offset = next_static_double_offset;
2857 next_static_double_offset += BytesPerLong;
2858 break;
2859 case NONSTATIC_OOP:
2860 if( nonstatic_oop_space_count > 0 ) {
2861 real_offset = nonstatic_oop_space_offset;
2862 nonstatic_oop_space_offset += oopSize;
2863 nonstatic_oop_space_count -= 1;
2864 } else {
2865 real_offset = next_nonstatic_oop_offset;
2866 next_nonstatic_oop_offset += oopSize;
2867 }
2868 // Update oop maps
2869 if( nonstatic_oop_map_count > 0 &&
2870 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
2871 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * oopSize) ) {
2872 // Extend current oop map
2873 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1;
2874 } else {
2875 // Create new oop map
2876 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset;
2877 nonstatic_oop_length [nonstatic_oop_map_count] = 1;
2878 nonstatic_oop_map_count += 1;
2879 if( first_nonstatic_oop_offset == 0 ) { // Undefined
2880 first_nonstatic_oop_offset = real_offset;
2881 }
2882 }
2883 break;
2884 case NONSTATIC_BYTE:
2885 if( nonstatic_byte_space_count > 0 ) {
2886 real_offset = nonstatic_byte_space_offset;
2887 nonstatic_byte_space_offset += 1;
2888 nonstatic_byte_space_count -= 1;
2889 } else {
2890 real_offset = next_nonstatic_byte_offset;
2891 next_nonstatic_byte_offset += 1;
2892 }
2893 break;
2894 case NONSTATIC_SHORT:
2895 if( nonstatic_short_space_count > 0 ) {
2896 real_offset = nonstatic_short_space_offset;
2897 nonstatic_short_space_offset += BytesPerShort;
2898 nonstatic_short_space_count -= 1;
2899 } else {
2900 real_offset = next_nonstatic_short_offset;
2901 next_nonstatic_short_offset += BytesPerShort;
2902 }
2903 break;
2904 case NONSTATIC_WORD:
2905 if( nonstatic_word_space_count > 0 ) {
2906 real_offset = nonstatic_word_space_offset;
2907 nonstatic_word_space_offset += BytesPerInt;
2908 nonstatic_word_space_count -= 1;
2909 } else {
2910 real_offset = next_nonstatic_word_offset;
2911 next_nonstatic_word_offset += BytesPerInt;
2912 }
2913 break;
2914 case NONSTATIC_ALIGNED_DOUBLE:
2915 case NONSTATIC_DOUBLE:
2916 real_offset = next_nonstatic_double_offset;
2917 next_nonstatic_double_offset += BytesPerLong;
2918 break;
2919 default:
2920 ShouldNotReachHere();
2921 }
2922 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) );
2923 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) );
2924 }
2925
2926 // Size of instances
2927 int instance_size;
2928
2929 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
2930
2931 assert(instance_size == align_object_size(instanceOopDesc::header_size() + nonstatic_field_size), "consistent layout helper value");
2932
2933 // Size of non-static oop map blocks (in words) allocated at end of klass
2934 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset);
2935
2936 // Compute reference type
2937 ReferenceType rt;
2938 if (super_klass() == NULL) {
2939 rt = REF_NONE;
2940 } else {
2941 rt = super_klass->reference_type();
2942 }
2943
2944 // We can now create the basic klassOop for this klass
2945 klassOop ik = oopFactory::new_instanceKlass(
2946 vtable_size, itable_size,
2947 static_field_size, nonstatic_oop_map_size,
2948 rt, CHECK_(nullHandle));
2949 instanceKlassHandle this_klass (THREAD, ik);
2950
2951 assert(this_klass->static_field_size() == static_field_size &&
2952 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check");
2953
2954 // Fill in information already parsed
2955 this_klass->set_access_flags(access_flags);
2956 jint lh = Klass::instance_layout_helper(instance_size, false);
2957 this_klass->set_layout_helper(lh);
2958 assert(this_klass->oop_is_instance(), "layout is correct");
2959 assert(this_klass->size_helper() == instance_size, "correct size_helper");
2960 // Not yet: supers are done below to support the new subtype-checking fields
2961 //this_klass->set_super(super_klass());
2962 this_klass->set_class_loader(class_loader());
2963 this_klass->set_nonstatic_field_size(nonstatic_field_size);
2964 this_klass->set_static_oop_field_size(fac.static_oop_count);
2965 cp->set_pool_holder(this_klass());
2966 this_klass->set_constants(cp());
2967 this_klass->set_local_interfaces(local_interfaces());
2968 this_klass->set_fields(fields());
2969 this_klass->set_methods(methods());
2970 if (has_final_method) {
2971 this_klass->set_has_final_method();
2972 }
2973 this_klass->set_method_ordering(method_ordering());
2974 this_klass->set_initial_method_idnum(methods->length());
2975 this_klass->set_name(cp->klass_name_at(this_class_index));
2976 this_klass->set_protection_domain(protection_domain());
2977 this_klass->set_fields_annotations(fields_annotations());
2978 this_klass->set_methods_annotations(methods_annotations());
2979 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
2980 this_klass->set_methods_default_annotations(methods_default_annotations());
2981
2982 this_klass->set_minor_version(minor_version);
2983 this_klass->set_major_version(major_version);
2984
2985 if (cached_class_file_bytes != NULL) {
2986 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
2987 this_klass->set_cached_class_file(cached_class_file_bytes,
2988 cached_class_file_length);
2989 }
2990
2991 // Miranda methods
2992 if ((num_miranda_methods > 0) ||
2993 // if this class introduced new miranda methods or
2994 (super_klass.not_null() && (super_klass->has_miranda_methods()))
2995 // super class exists and this class inherited miranda methods
2996 ) {
2997 this_klass->set_has_miranda_methods(); // then set a flag
2998 }
2999
3000 // Additional attributes
3001 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3002
3003 // Make sure this is the end of class file stream
3004 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3005
3006 // Initialize static fields
3007 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3008
3009 // VerifyOops believes that once this has been set, the object is completely loaded.
3010 // Compute transitive closure of interfaces this class implements
3011 this_klass->set_transitive_interfaces(transitive_interfaces());
3012
3013 // Fill in information needed to compute superclasses.
3014 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3015
3016 // Initialize itable offset tables
3017 klassItable::setup_itable_offset_table(this_klass);
3018
3019 // Do final class setup
3020 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length);
3021
3022 set_precomputed_flags(this_klass);
3023
3024 // reinitialize modifiers, using the InnerClasses attribute
3025 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3026 this_klass->set_modifier_flags(computed_modifiers);
3027
3028 // check if this class can access its super class
3029 check_super_class_access(this_klass, CHECK_(nullHandle));
3030
3031 // check if this class can access its superinterfaces
3032 check_super_interface_access(this_klass, CHECK_(nullHandle));
3033
3034 // check if this class overrides any final method
3035 check_final_method_override(this_klass, CHECK_(nullHandle));
3036
3037 // check that if this class is an interface then it doesn't have static methods
3038 if (this_klass->is_interface()) {
3039 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3040 }
3041
3042 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3043 false /* not shared class */);
3044
3045 if (TraceClassLoading) {
3046 // print in a single call to reduce interleaving of output
3047 if (cfs->source() != NULL) {
3048 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3049 cfs->source());
3050 } else if (class_loader.is_null()) {
3051 if (THREAD->is_Java_thread()) {
3052 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3053 tty->print("[Loaded %s by instance of %s]\n",
3054 this_klass->external_name(),
3055 instanceKlass::cast(caller)->external_name());
3056 } else {
3057 tty->print("[Loaded %s]\n", this_klass->external_name());
3058 }
3059 } else {
3060 ResourceMark rm;
3061 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3062 instanceKlass::cast(class_loader->klass())->external_name());
3063 }
3064 }
3065
3066 if (TraceClassResolution) {
3067 // print out the superclass.
3068 const char * from = Klass::cast(this_klass())->external_name();
3069 if (this_klass->java_super() != NULL) {
3070 tty->print("RESOLVE %s %s\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3071 }
3072 // print out each of the interface classes referred to by this class.
3073 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3074 if (!local_interfaces.is_null()) {
3075 int length = local_interfaces->length();
3076 for (int i = 0; i < length; i++) {
3077 klassOop k = klassOop(local_interfaces->obj_at(i));
3078 instanceKlass* to_class = instanceKlass::cast(k);
3079 const char * to = to_class->external_name();
3080 tty->print("RESOLVE %s %s\n", from, to);
3081 }
3082 }
3083 }
3084
3085 #ifndef PRODUCT
3086 if( PrintCompactFieldsSavings ) {
3087 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3088 tty->print("[Saved %d of %3d words in %s]\n",
3089 orig_nonstatic_field_size - nonstatic_field_size,
3090 orig_nonstatic_field_size, this_klass->external_name());
3091 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3092 tty->print("[Wasted %d over %3d words in %s]\n",
3093 nonstatic_field_size - orig_nonstatic_field_size,
3094 orig_nonstatic_field_size, this_klass->external_name());
3095 }
3096 }
3097 #endif
3098
3099 // preserve result across HandleMark
3100 preserve_this_klass = this_klass();
3101 }
3102
3103 // Create new handle outside HandleMark
3104 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3105 debug_only(this_klass->as_klassOop()->verify();)
3106
3107 return this_klass;
3108 }
3109
3110
3111 int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) {
3112 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size();
3113 if (nonstatic_oop_map_count > 0) {
3114 // We have oops to add to map
3115 if (map_size == 0) {
3116 map_size = nonstatic_oop_map_count;
3117 } else {
3118 // Check whether we should add a new map block or whether the last one can be extended
3119 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps();
3120 OopMapBlock* last_map = first_map + map_size - 1;
3121
3122 int next_offset = last_map->offset() + (last_map->length() * oopSize);
3123 if (next_offset == first_nonstatic_oop_offset) {
3124 // There is no gap bettwen superklass's last oop field and first
3125 // local oop field, merge maps.
3126 nonstatic_oop_map_count -= 1;
3127 } else {
3128 // Superklass didn't end with a oop field, add extra maps
3129 assert(next_offset<first_nonstatic_oop_offset, "just checking");
3130 }
3131 map_size += nonstatic_oop_map_count;
3132 }
3133 }
3134 return map_size;
3135 }
3136
3137
3138 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3139 int nonstatic_oop_map_count,
3140 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) {
3141 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3142 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size();
3143 instanceKlass* super = k->superklass();
3144 if (super != NULL) {
3145 int super_oop_map_size = super->nonstatic_oop_map_size();
3146 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3147 // Copy maps from superklass
3148 while (super_oop_map_size-- > 0) {
3149 *this_oop_map++ = *super_oop_map++;
3150 }
3151 }
3152 if (nonstatic_oop_map_count > 0) {
3153 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) {
3154 // Calculated in compute_oop_map_size() number of oop maps is less then
3155 // collected oop maps since there is no gap between superklass's last oop
3156 // field and first local oop field. Extend the last oop map copied
3157 // from the superklass instead of creating new one.
3158 nonstatic_oop_map_count--;
3159 nonstatic_oop_offsets++;
3160 this_oop_map--;
3161 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++);
3162 this_oop_map++;
3163 }
3164 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking");
3165 // Add new map blocks, fill them
3166 while (nonstatic_oop_map_count-- > 0) {
3167 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3168 this_oop_map->set_length(*nonstatic_oop_length++);
3169 this_oop_map++;
3170 }
3171 }
3172 }
3173
3174
3175 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3176 klassOop super = k->super();
3177
3178 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3179 // in which case we don't have to register objects as finalizable
3180 if (!_has_empty_finalizer) {
3181 if (_has_finalizer ||
3182 (super != NULL && super->klass_part()->has_finalizer())) {
3183 k->set_has_finalizer();
3184 }
3185 }
3186
3187 #ifdef ASSERT
3188 bool f = false;
3189 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3190 vmSymbols::void_method_signature());
3191 if (m != NULL && !m->is_empty_method()) {
3192 f = true;
3193 }
3194 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3195 #endif
3196
3197 // Check if this klass supports the java.lang.Cloneable interface
3198 if (SystemDictionary::cloneable_klass_loaded()) {
3199 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) {
3200 k->set_is_cloneable();
3201 }
3202 }
3203
3204 // Check if this klass has a vanilla default constructor
3205 if (super == NULL) {
3206 // java.lang.Object has empty default constructor
3207 k->set_has_vanilla_constructor();
3208 } else {
3209 if (Klass::cast(super)->has_vanilla_constructor() &&
3210 _has_vanilla_constructor) {
3211 k->set_has_vanilla_constructor();
3212 }
3213 #ifdef ASSERT
3214 bool v = false;
3215 if (Klass::cast(super)->has_vanilla_constructor()) {
3216 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3217 ), vmSymbols::void_method_signature());
3218 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3219 v = true;
3220 }
3221 }
3222 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3223 #endif
3224 }
3225
3226 // If it cannot be fast-path allocated, set a bit in the layout helper.
3227 // See documentation of instanceKlass::can_be_fastpath_allocated().
3228 assert(k->size_helper() > 0, "layout_helper is initialized");
3229 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3230 || k->is_abstract() || k->is_interface()
3231 || (k->name() == vmSymbols::java_lang_Class()
3232 && k->class_loader() == NULL)
3233 || k->size_helper() >= FastAllocateSizeLimit) {
3234 // Forbid fast-path allocation.
3235 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3236 k->set_layout_helper(lh);
3237 }
3238 }
3239
3240
3241 // utility method for appending and array with check for duplicates
3242
3243 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3244 // iterate over new interfaces
3245 for (int i = 0; i < ifs->length(); i++) {
3246 oop e = ifs->obj_at(i);
3247 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3248 // check for duplicates
3249 bool duplicate = false;
3250 for (int j = 0; j < index; j++) {
3251 if (result->obj_at(j) == e) {
3252 duplicate = true;
3253 break;
3254 }
3255 }
3256 // add new interface
3257 if (!duplicate) {
3258 result->obj_at_put(index++, e);
3259 }
3260 }
3261 }
3262
3263 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3264 // Compute maximum size for transitive interfaces
3265 int max_transitive_size = 0;
3266 int super_size = 0;
3267 // Add superclass transitive interfaces size
3268 if (super.not_null()) {
3269 super_size = super->transitive_interfaces()->length();
3270 max_transitive_size += super_size;
3271 }
3272 // Add local interfaces' super interfaces
3273 int local_size = local_ifs->length();
3274 for (int i = 0; i < local_size; i++) {
3275 klassOop l = klassOop(local_ifs->obj_at(i));
3276 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3277 }
3278 // Finally add local interfaces
3279 max_transitive_size += local_size;
3280 // Construct array
3281 objArrayHandle result;
3282 if (max_transitive_size == 0) {
3283 // no interfaces, use canonicalized array
3284 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3285 } else if (max_transitive_size == super_size) {
3286 // no new local interfaces added, share superklass' transitive interface array
3287 result = objArrayHandle(THREAD, super->transitive_interfaces());
3288 } else if (max_transitive_size == local_size) {
3289 // only local interfaces added, share local interface array
3290 result = local_ifs;
3291 } else {
3292 objArrayHandle nullHandle;
3293 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3294 result = objArrayHandle(THREAD, new_objarray);
3295 int index = 0;
3296 // Copy down from superclass
3297 if (super.not_null()) {
3298 append_interfaces(result, index, super->transitive_interfaces());
3299 }
3300 // Copy down from local interfaces' superinterfaces
3301 for (int i = 0; i < local_ifs->length(); i++) {
3302 klassOop l = klassOop(local_ifs->obj_at(i));
3303 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3304 }
3305 // Finally add local interfaces
3306 append_interfaces(result, index, local_ifs());
3307
3308 // Check if duplicates were removed
3309 if (index != max_transitive_size) {
3310 assert(index < max_transitive_size, "just checking");
3311 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3312 for (int i = 0; i < index; i++) {
3313 oop e = result->obj_at(i);
3314 assert(e != NULL, "just checking");
3315 new_result->obj_at_put(i, e);
3316 }
3317 result = objArrayHandle(THREAD, new_result);
3318 }
3319 }
3320 return result;
3321 }
3322
3323
3324 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3325 klassOop super = this_klass->super();
3326 if ((super != NULL) &&
3327 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3328 ResourceMark rm(THREAD);
3329 Exceptions::fthrow(
3330 THREAD_AND_LOCATION,
3331 vmSymbolHandles::java_lang_IllegalAccessError(),
3332 "class %s cannot access its superclass %s",
3333 this_klass->external_name(),
3334 instanceKlass::cast(super)->external_name()
3335 );
3336 return;
3337 }
3338 }
3339
3340
3341 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3342 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3343 int lng = local_interfaces->length();
3344 for (int i = lng - 1; i >= 0; i--) {
3345 klassOop k = klassOop(local_interfaces->obj_at(i));
3346 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3347 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3348 ResourceMark rm(THREAD);
3349 Exceptions::fthrow(
3350 THREAD_AND_LOCATION,
3351 vmSymbolHandles::java_lang_IllegalAccessError(),
3352 "class %s cannot access its superinterface %s",
3353 this_klass->external_name(),
3354 instanceKlass::cast(k)->external_name()
3355 );
3356 return;
3357 }
3358 }
3359 }
3360
3361
3362 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3363 objArrayHandle methods (THREAD, this_klass->methods());
3364 int num_methods = methods->length();
3365
3366 // go thru each method and check if it overrides a final method
3367 for (int index = 0; index < num_methods; index++) {
3368 methodOop m = (methodOop)methods->obj_at(index);
3369
3370 // skip private, static and <init> methods
3371 if ((!m->is_private()) &&
3372 (!m->is_static()) &&
3373 (m->name() != vmSymbols::object_initializer_name())) {
3374
3375 symbolOop name = m->name();
3376 symbolOop signature = m->signature();
3377 klassOop k = this_klass->super();
3378 methodOop super_m = NULL;
3379 while (k != NULL) {
3380 // skip supers that don't have final methods.
3381 if (k->klass_part()->has_final_method()) {
3382 // lookup a matching method in the super class hierarchy
3383 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3384 if (super_m == NULL) {
3385 break; // didn't find any match; get out
3386 }
3387
3388 if (super_m->is_final() &&
3389 // matching method in super is final
3390 (Reflection::verify_field_access(this_klass->as_klassOop(),
3391 super_m->method_holder(),
3392 super_m->method_holder(),
3393 super_m->access_flags(), false))
3394 // this class can access super final method and therefore override
3395 ) {
3396 ResourceMark rm(THREAD);
3397 Exceptions::fthrow(
3398 THREAD_AND_LOCATION,
3399 vmSymbolHandles::java_lang_VerifyError(),
3400 "class %s overrides final method %s.%s",
3401 this_klass->external_name(),
3402 name->as_C_string(),
3403 signature->as_C_string()
3404 );
3405 return;
3406 }
3407
3408 // continue to look from super_m's holder's super.
3409 k = instanceKlass::cast(super_m->method_holder())->super();
3410 continue;
3411 }
3412
3413 k = k->klass_part()->super();
3414 }
3415 }
3416 }
3417 }
3418
3419
3420 // assumes that this_klass is an interface
3421 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3422 assert(this_klass->is_interface(), "not an interface");
3423 objArrayHandle methods (THREAD, this_klass->methods());
3424 int num_methods = methods->length();
3425
3426 for (int index = 0; index < num_methods; index++) {
3427 methodOop m = (methodOop)methods->obj_at(index);
3428 // if m is static and not the init method, throw a verify error
3429 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3430 ResourceMark rm(THREAD);
3431 Exceptions::fthrow(
3432 THREAD_AND_LOCATION,
3433 vmSymbolHandles::java_lang_VerifyError(),
3434 "Illegal static method %s in interface %s",
3435 m->name()->as_C_string(),
3436 this_klass->external_name()
3437 );
3438 return;
3439 }
3440 }
3441 }
3442
3443 // utility methods for format checking
3444
3445 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3446 if (!_need_verify) { return; }
3447
3448 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3449 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3450 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3451 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3452 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3453 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3454 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3455
3456 if ((is_abstract && is_final) ||
3457 (is_interface && !is_abstract) ||
3458 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3459 (!is_interface && major_gte_15 && is_annotation)) {
3460 ResourceMark rm(THREAD);
3461 Exceptions::fthrow(
3462 THREAD_AND_LOCATION,
3463 vmSymbolHandles::java_lang_ClassFormatError(),
3464 "Illegal class modifiers in class %s: 0x%X",
3465 _class_name->as_C_string(), flags
3466 );
3467 return;
3468 }
3469 }
3470
3471 bool ClassFileParser::has_illegal_visibility(jint flags) {
3472 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3473 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3474 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3475
3476 return ((is_public && is_protected) ||
3477 (is_public && is_private) ||
3478 (is_protected && is_private));
3479 }
3480
3481 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3482 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3483 (major <= JAVA_MAX_SUPPORTED_VERSION) &&
3484 ((major != JAVA_MAX_SUPPORTED_VERSION) ||
3485 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3486 }
3487
3488 void ClassFileParser::verify_legal_field_modifiers(
3489 jint flags, bool is_interface, TRAPS) {
3490 if (!_need_verify) { return; }
3491
3492 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3493 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3494 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3495 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3496 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3497 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3498 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3499 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3500 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3501
3502 bool is_illegal = false;
3503
3504 if (is_interface) {
3505 if (!is_public || !is_static || !is_final || is_private ||
3506 is_protected || is_volatile || is_transient ||
3507 (major_gte_15 && is_enum)) {
3508 is_illegal = true;
3509 }
3510 } else { // not interface
3511 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3512 is_illegal = true;
3513 }
3514 }
3515
3516 if (is_illegal) {
3517 ResourceMark rm(THREAD);
3518 Exceptions::fthrow(
3519 THREAD_AND_LOCATION,
3520 vmSymbolHandles::java_lang_ClassFormatError(),
3521 "Illegal field modifiers in class %s: 0x%X",
3522 _class_name->as_C_string(), flags);
3523 return;
3524 }
3525 }
3526
3527 void ClassFileParser::verify_legal_method_modifiers(
3528 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3529 if (!_need_verify) { return; }
3530
3531 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3532 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3533 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3534 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3535 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3536 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3537 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3538 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3539 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3540 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3541 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3542
3543 bool is_illegal = false;
3544
3545 if (is_interface) {
3546 if (!is_abstract || !is_public || is_static || is_final ||
3547 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3548 is_illegal = true;
3549 }
3550 } else { // not interface
3551 if (is_initializer) {
3552 if (is_static || is_final || is_synchronized || is_native ||
3553 is_abstract || (major_gte_15 && is_bridge)) {
3554 is_illegal = true;
3555 }
3556 } else { // not initializer
3557 if (is_abstract) {
3558 if ((is_final || is_native || is_private || is_static ||
3559 (major_gte_15 && (is_synchronized || is_strict)))) {
3560 is_illegal = true;
3561 }
3562 }
3563 if (has_illegal_visibility(flags)) {
3564 is_illegal = true;
3565 }
3566 }
3567 }
3568
3569 if (is_illegal) {
3570 ResourceMark rm(THREAD);
3571 Exceptions::fthrow(
3572 THREAD_AND_LOCATION,
3573 vmSymbolHandles::java_lang_ClassFormatError(),
3574 "Method %s in class %s has illegal modifiers: 0x%X",
3575 name->as_C_string(), _class_name->as_C_string(), flags);
3576 return;
3577 }
3578 }
3579
3580 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3581 assert(_need_verify, "only called when _need_verify is true");
3582 int i = 0;
3583 int count = length >> 2;
3584 for (int k=0; k<count; k++) {
3585 unsigned char b0 = buffer[i];
3586 unsigned char b1 = buffer[i+1];
3587 unsigned char b2 = buffer[i+2];
3588 unsigned char b3 = buffer[i+3];
3589 // For an unsigned char v,
3590 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3591 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3592 unsigned char res = b0 | b0 - 1 |
3593 b1 | b1 - 1 |
3594 b2 | b2 - 1 |
3595 b3 | b3 - 1;
3596 if (res >= 128) break;
3597 i += 4;
3598 }
3599 for(; i < length; i++) {
3600 unsigned short c;
3601 // no embedded zeros
3602 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3603 if(buffer[i] < 128) {
3604 continue;
3605 }
3606 if ((i + 5) < length) { // see if it's legal supplementary character
3607 if (UTF8::is_supplementary_character(&buffer[i])) {
3608 c = UTF8::get_supplementary_character(&buffer[i]);
3609 i += 5;
3610 continue;
3611 }
3612 }
3613 switch (buffer[i] >> 4) {
3614 default: break;
3615 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3616 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3617 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
3618 c = (buffer[i] & 0x1F) << 6;
3619 i++;
3620 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3621 c += buffer[i] & 0x3F;
3622 if (_major_version <= 47 || c == 0 || c >= 0x80) {
3623 // for classes with major > 47, c must a null or a character in its shortest form
3624 break;
3625 }
3626 }
3627 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3628 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
3629 c = (buffer[i] & 0xF) << 12;
3630 i += 2;
3631 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3632 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3633 if (_major_version <= 47 || c >= 0x800) {
3634 // for classes with major > 47, c must be in its shortest form
3635 break;
3636 }
3637 }
3638 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3639 } // end of switch
3640 } // end of for
3641 }
3642
3643 // Checks if name is a legal class name.
3644 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3645 if (!_need_verify || _relax_verify) { return; }
3646
3647 char buf[fixed_buffer_size];
3648 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3649 unsigned int length = name->utf8_length();
3650 bool legal = false;
3651
3652 if (length > 0) {
3653 char* p;
3654 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3655 p = skip_over_field_signature(bytes, false, length, CHECK);
3656 legal = (p != NULL) && ((p - bytes) == (int)length);
3657 } else if (_major_version < JAVA_1_5_VERSION) {
3658 if (bytes[0] != '<') {
3659 p = skip_over_field_name(bytes, true, length);
3660 legal = (p != NULL) && ((p - bytes) == (int)length);
3661 }
3662 } else {
3663 // 4900761: relax the constraints based on JSR202 spec
3664 // Class names may be drawn from the entire Unicode character set.
3665 // Identifiers between '/' must be unqualified names.
3666 // The utf8 string has been verified when parsing cpool entries.
3667 legal = verify_unqualified_name(bytes, length, LegalClass);
3668 }
3669 }
3670 if (!legal) {
3671 ResourceMark rm(THREAD);
3672 Exceptions::fthrow(
3673 THREAD_AND_LOCATION,
3674 vmSymbolHandles::java_lang_ClassFormatError(),
3675 "Illegal class name \"%s\" in class file %s", bytes,
3676 _class_name->as_C_string()
3677 );
3678 return;
3679 }
3680 }
3681
3682 // Checks if name is a legal field name.
3683 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3684 if (!_need_verify || _relax_verify) { return; }
3685
3686 char buf[fixed_buffer_size];
3687 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3688 unsigned int length = name->utf8_length();
3689 bool legal = false;
3690
3691 if (length > 0) {
3692 if (_major_version < JAVA_1_5_VERSION) {
3693 if (bytes[0] != '<') {
3694 char* p = skip_over_field_name(bytes, false, length);
3695 legal = (p != NULL) && ((p - bytes) == (int)length);
3696 }
3697 } else {
3698 // 4881221: relax the constraints based on JSR202 spec
3699 legal = verify_unqualified_name(bytes, length, LegalField);
3700 }
3701 }
3702
3703 if (!legal) {
3704 ResourceMark rm(THREAD);
3705 Exceptions::fthrow(
3706 THREAD_AND_LOCATION,
3707 vmSymbolHandles::java_lang_ClassFormatError(),
3708 "Illegal field name \"%s\" in class %s", bytes,
3709 _class_name->as_C_string()
3710 );
3711 return;
3712 }
3713 }
3714
3715 // Checks if name is a legal method name.
3716 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
3717 if (!_need_verify || _relax_verify) { return; }
3718
3719 assert(!name.is_null(), "method name is null");
3720 char buf[fixed_buffer_size];
3721 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3722 unsigned int length = name->utf8_length();
3723 bool legal = false;
3724
3725 if (length > 0) {
3726 if (bytes[0] == '<') {
3727 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
3728 legal = true;
3729 }
3730 } else if (_major_version < JAVA_1_5_VERSION) {
3731 char* p;
3732 p = skip_over_field_name(bytes, false, length);
3733 legal = (p != NULL) && ((p - bytes) == (int)length);
3734 } else {
3735 // 4881221: relax the constraints based on JSR202 spec
3736 legal = verify_unqualified_name(bytes, length, LegalMethod);
3737 }
3738 }
3739
3740 if (!legal) {
3741 ResourceMark rm(THREAD);
3742 Exceptions::fthrow(
3743 THREAD_AND_LOCATION,
3744 vmSymbolHandles::java_lang_ClassFormatError(),
3745 "Illegal method name \"%s\" in class %s", bytes,
3746 _class_name->as_C_string()
3747 );
3748 return;
3749 }
3750 }
3751
3752
3753 // Checks if signature is a legal field signature.
3754 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3755 if (!_need_verify) { return; }
3756
3757 char buf[fixed_buffer_size];
3758 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3759 unsigned int length = signature->utf8_length();
3760 char* p = skip_over_field_signature(bytes, false, length, CHECK);
3761
3762 if (p == NULL || (p - bytes) != (int)length) {
3763 ResourceMark rm(THREAD);
3764 Exceptions::fthrow(
3765 THREAD_AND_LOCATION,
3766 vmSymbolHandles::java_lang_ClassFormatError(),
3767 "Field \"%s\" in class %s has illegal signature \"%s\"",
3768 name->as_C_string(), _class_name->as_C_string(), bytes
3769 );
3770 return;
3771 }
3772 }
3773
3774 // Checks if signature is a legal method signature.
3775 // Returns number of parameters
3776 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3777 if (!_need_verify) {
3778 // make sure caller's args_size will be less than 0 even for non-static
3779 // method so it will be recomputed in compute_size_of_parameters().
3780 return -2;
3781 }
3782
3783 unsigned int args_size = 0;
3784 char buf[fixed_buffer_size];
3785 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3786 unsigned int length = signature->utf8_length();
3787 char* nextp;
3788
3789 // The first character must be a '('
3790 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
3791 length--;
3792 // Skip over legal field signatures
3793 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3794 while ((length > 0) && (nextp != NULL)) {
3795 args_size++;
3796 if (p[0] == 'J' || p[0] == 'D') {
3797 args_size++;
3798 }
3799 length -= nextp - p;
3800 p = nextp;
3801 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3802 }
3803 // The first non-signature thing better be a ')'
3804 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
3805 length--;
3806 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
3807 // All internal methods must return void
3808 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
3809 return args_size;
3810 }
3811 } else {
3812 // Now we better just have a return value
3813 nextp = skip_over_field_signature(p, true, length, CHECK_0);
3814 if (nextp && ((int)length == (nextp - p))) {
3815 return args_size;
3816 }
3817 }
3818 }
3819 }
3820 // Report error
3821 ResourceMark rm(THREAD);
3822 Exceptions::fthrow(
3823 THREAD_AND_LOCATION,
3824 vmSymbolHandles::java_lang_ClassFormatError(),
3825 "Method \"%s\" in class %s has illegal signature \"%s\"",
3826 name->as_C_string(), _class_name->as_C_string(), p
3827 );
3828 return 0;
3829 }
3830
3831
3832 // Unqualified names may not contain the characters '.', ';', or '/'.
3833 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
3834 // Note that method names may not be <init> or <clinit> in this method.
3835 // Because these names have been checked as special cases before calling this method
3836 // in verify_legal_method_name.
3837 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
3838 jchar ch;
3839
3840 for (char* p = name; p != name + length; ) {
3841 ch = *p;
3842 if (ch < 128) {
3843 p++;
3844 if (ch == '.' || ch == ';') {
3845 return false; // do not permit '.' or ';'
3846 }
3847 if (type != LegalClass && ch == '/') {
3848 return false; // do not permit '/' unless it's class name
3849 }
3850 if (type == LegalMethod && (ch == '<' || ch == '>')) {
3851 return false; // do not permit '<' or '>' in method names
3852 }
3853 } else {
3854 char* tmp_p = UTF8::next(p, &ch);
3855 p = tmp_p;
3856 }
3857 }
3858 return true;
3859 }
3860
3861
3862 // Take pointer to a string. Skip over the longest part of the string that could
3863 // be taken as a fieldname. Allow '/' if slash_ok is true.
3864 // Return a pointer to just past the fieldname.
3865 // Return NULL if no fieldname at all was found, or in the case of slash_ok
3866 // being true, we saw consecutive slashes (meaning we were looking for a
3867 // qualified path but found something that was badly-formed).
3868 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
3869 char* p;
3870 jchar ch;
3871 jboolean last_is_slash = false;
3872 jboolean not_first_ch = false;
3873
3874 for (p = name; p != name + length; not_first_ch = true) {
3875 char* old_p = p;
3876 ch = *p;
3877 if (ch < 128) {
3878 p++;
3879 // quick check for ascii
3880 if ((ch >= 'a' && ch <= 'z') ||
3881 (ch >= 'A' && ch <= 'Z') ||
3882 (ch == '_' || ch == '$') ||
3883 (not_first_ch && ch >= '0' && ch <= '9')) {
3884 last_is_slash = false;
3885 continue;
3886 }
3887 if (slash_ok && ch == '/') {
3888 if (last_is_slash) {
3889 return NULL; // Don't permit consecutive slashes
3890 }
3891 last_is_slash = true;
3892 continue;
3893 }
3894 } else {
3895 jint unicode_ch;
3896 char* tmp_p = UTF8::next_character(p, &unicode_ch);
3897 p = tmp_p;
3898 last_is_slash = false;
3899 // Check if ch is Java identifier start or is Java identifier part
3900 // 4672820: call java.lang.Character methods directly without generating separate tables.
3901 EXCEPTION_MARK;
3902 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass());
3903
3904 // return value
3905 JavaValue result(T_BOOLEAN);
3906 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
3907 JavaCallArguments args;
3908 args.push_int(unicode_ch);
3909
3910 // public static boolean isJavaIdentifierStart(char ch);
3911 JavaCalls::call_static(&result,
3912 klass,
3913 vmSymbolHandles::isJavaIdentifierStart_name(),
3914 vmSymbolHandles::int_bool_signature(),
3915 &args,
3916 THREAD);
3917
3918 if (HAS_PENDING_EXCEPTION) {
3919 CLEAR_PENDING_EXCEPTION;
3920 return 0;
3921 }
3922 if (result.get_jboolean()) {
3923 continue;
3924 }
3925
3926 if (not_first_ch) {
3927 // public static boolean isJavaIdentifierPart(char ch);
3928 JavaCalls::call_static(&result,
3929 klass,
3930 vmSymbolHandles::isJavaIdentifierPart_name(),
3931 vmSymbolHandles::int_bool_signature(),
3932 &args,
3933 THREAD);
3934
3935 if (HAS_PENDING_EXCEPTION) {
3936 CLEAR_PENDING_EXCEPTION;
3937 return 0;
3938 }
3939
3940 if (result.get_jboolean()) {
3941 continue;
3942 }
3943 }
3944 }
3945 return (not_first_ch) ? old_p : NULL;
3946 }
3947 return (not_first_ch) ? p : NULL;
3948 }
3949
3950
3951 // Take pointer to a string. Skip over the longest part of the string that could
3952 // be taken as a field signature. Allow "void" if void_ok.
3953 // Return a pointer to just past the signature.
3954 // Return NULL if no legal signature is found.
3955 char* ClassFileParser::skip_over_field_signature(char* signature,
3956 bool void_ok,
3957 unsigned int length,
3958 TRAPS) {
3959 unsigned int array_dim = 0;
3960 while (length > 0) {
3961 switch (signature[0]) {
3962 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
3963 case JVM_SIGNATURE_BOOLEAN:
3964 case JVM_SIGNATURE_BYTE:
3965 case JVM_SIGNATURE_CHAR:
3966 case JVM_SIGNATURE_SHORT:
3967 case JVM_SIGNATURE_INT:
3968 case JVM_SIGNATURE_FLOAT:
3969 case JVM_SIGNATURE_LONG:
3970 case JVM_SIGNATURE_DOUBLE:
3971 return signature + 1;
3972 case JVM_SIGNATURE_CLASS: {
3973 if (_major_version < JAVA_1_5_VERSION) {
3974 // Skip over the class name if one is there
3975 char* p = skip_over_field_name(signature + 1, true, --length);
3976
3977 // The next character better be a semicolon
3978 if (p && (p - signature) > 1 && p[0] == ';') {
3979 return p + 1;
3980 }
3981 } else {
3982 // 4900761: For class version > 48, any unicode is allowed in class name.
3983 length--;
3984 signature++;
3985 while (length > 0 && signature[0] != ';') {
3986 if (signature[0] == '.') {
3987 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
3988 }
3989 length--;
3990 signature++;
3991 }
3992 if (signature[0] == ';') { return signature + 1; }
3993 }
3994
3995 return NULL;
3996 }
3997 case JVM_SIGNATURE_ARRAY:
3998 array_dim++;
3999 if (array_dim > 255) {
4000 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4001 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4002 }
4003 // The rest of what's there better be a legal signature
4004 signature++;
4005 length--;
4006 void_ok = false;
4007 break;
4008
4009 default:
4010 return NULL;
4011 }
4012 }
4013 return NULL;
4014 }