1 /*
2 * Copyright 1997-2008 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 51
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 // - also used as the max version when running in jdk6
48 #define JAVA_6_VERSION 50
49
50
51 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
52 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
53 // this function (_current can be allocated in a register, with scalar
54 // replacement of aggregates). The _current pointer is copied back to
55 // stream() when this function returns. DON'T call another method within
56 // this method that uses stream().
57 ClassFileStream* cfs0 = stream();
58 ClassFileStream cfs1 = *cfs0;
59 ClassFileStream* cfs = &cfs1;
60 #ifdef ASSERT
61 u1* old_current = cfs0->current();
62 #endif
63
64 // Used for batching symbol allocations.
65 const char* names[SymbolTable::symbol_alloc_batch_size];
66 int lengths[SymbolTable::symbol_alloc_batch_size];
67 int indices[SymbolTable::symbol_alloc_batch_size];
68 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
69 int names_count = 0;
70
71 // parsing Index 0 is unused
72 for (int index = 1; index < length; index++) {
73 // Each of the following case guarantees one more byte in the stream
74 // for the following tag or the access_flags following constant pool,
75 // so we don't need bounds-check for reading tag.
76 u1 tag = cfs->get_u1_fast();
77 switch (tag) {
78 case JVM_CONSTANT_Class :
79 {
80 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
81 u2 name_index = cfs->get_u2_fast();
82 cp->klass_index_at_put(index, name_index);
83 }
84 break;
85 case JVM_CONSTANT_Fieldref :
86 {
87 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
88 u2 class_index = cfs->get_u2_fast();
89 u2 name_and_type_index = cfs->get_u2_fast();
90 cp->field_at_put(index, class_index, name_and_type_index);
91 }
92 break;
93 case JVM_CONSTANT_Methodref :
94 {
95 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
96 u2 class_index = cfs->get_u2_fast();
97 u2 name_and_type_index = cfs->get_u2_fast();
98 cp->method_at_put(index, class_index, name_and_type_index);
99 }
100 break;
101 case JVM_CONSTANT_InterfaceMethodref :
102 {
103 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
104 u2 class_index = cfs->get_u2_fast();
105 u2 name_and_type_index = cfs->get_u2_fast();
106 cp->interface_method_at_put(index, class_index, name_and_type_index);
107 }
108 break;
109 case JVM_CONSTANT_String :
110 {
111 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
112 u2 string_index = cfs->get_u2_fast();
113 cp->string_index_at_put(index, string_index);
114 }
115 break;
116 case JVM_CONSTANT_Integer :
117 {
118 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
119 u4 bytes = cfs->get_u4_fast();
120 cp->int_at_put(index, (jint) bytes);
121 }
122 break;
123 case JVM_CONSTANT_Float :
124 {
125 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
126 u4 bytes = cfs->get_u4_fast();
127 cp->float_at_put(index, *(jfloat*)&bytes);
128 }
129 break;
130 case JVM_CONSTANT_Long :
131 // A mangled type might cause you to overrun allocated memory
132 guarantee_property(index+1 < length,
133 "Invalid constant pool entry %u in class file %s",
134 index, CHECK);
135 {
136 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
137 u8 bytes = cfs->get_u8_fast();
138 cp->long_at_put(index, bytes);
139 }
140 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
141 break;
142 case JVM_CONSTANT_Double :
143 // A mangled type might cause you to overrun allocated memory
144 guarantee_property(index+1 < length,
145 "Invalid constant pool entry %u in class file %s",
146 index, CHECK);
147 {
148 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
149 u8 bytes = cfs->get_u8_fast();
150 cp->double_at_put(index, *(jdouble*)&bytes);
151 }
152 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
153 break;
154 case JVM_CONSTANT_NameAndType :
155 {
156 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
157 u2 name_index = cfs->get_u2_fast();
158 u2 signature_index = cfs->get_u2_fast();
159 cp->name_and_type_at_put(index, name_index, signature_index);
160 }
161 break;
162 case JVM_CONSTANT_Utf8 :
163 {
164 cfs->guarantee_more(2, CHECK); // utf8_length
165 u2 utf8_length = cfs->get_u2_fast();
166 u1* utf8_buffer = cfs->get_u1_buffer();
167 assert(utf8_buffer != NULL, "null utf8 buffer");
168 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
169 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
170 cfs->skip_u1_fast(utf8_length);
171
172 // Before storing the symbol, make sure it's legal
173 if (_need_verify) {
174 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
175 }
176
177 if (AnonymousClasses && has_cp_patch_at(index)) {
178 Handle patch = clear_cp_patch_at(index);
179 guarantee_property(java_lang_String::is_instance(patch()),
180 "Illegal utf8 patch at %d in class file %s",
181 index, CHECK);
182 char* str = java_lang_String::as_utf8_string(patch());
183 // (could use java_lang_String::as_symbol instead, but might as well batch them)
184 utf8_buffer = (u1*) str;
185 utf8_length = (int) strlen(str);
186 }
187
188 unsigned int hash;
189 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
190 if (result == NULL) {
191 names[names_count] = (char*)utf8_buffer;
192 lengths[names_count] = utf8_length;
193 indices[names_count] = index;
194 hashValues[names_count++] = hash;
195 if (names_count == SymbolTable::symbol_alloc_batch_size) {
196 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
197 names_count = 0;
198 }
199 } else {
200 cp->symbol_at_put(index, result);
201 }
202 }
203 break;
204 default:
205 classfile_parse_error(
206 "Unknown constant tag %u in class file %s", tag, CHECK);
207 break;
208 }
209 }
210
211 // Allocate the remaining symbols
212 if (names_count > 0) {
213 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
214 }
215
216 // Copy _current pointer of local copy back to stream().
217 #ifdef ASSERT
218 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
219 #endif
220 cfs0->set_current(cfs1.current());
221 }
222
223 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
224
225 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
226 ClassFileStream* cfs = stream();
227 constantPoolHandle nullHandle;
228
229 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
230 u2 length = cfs->get_u2_fast();
231 guarantee_property(
232 length >= 1, "Illegal constant pool size %u in class file %s",
233 length, CHECK_(nullHandle));
234 constantPoolOop constant_pool =
235 oopFactory::new_constantPool(length, CHECK_(nullHandle));
236 constantPoolHandle cp (THREAD, constant_pool);
237
238 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
239
240 // parsing constant pool entries
241 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
242
243 int index = 1; // declared outside of loops for portability
244
245 // first verification pass - validate cross references and fixup class and string constants
246 for (index = 1; index < length; index++) { // Index 0 is unused
247 switch (cp->tag_at(index).value()) {
248 case JVM_CONSTANT_Class :
249 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
250 break;
251 case JVM_CONSTANT_Fieldref :
252 // fall through
253 case JVM_CONSTANT_Methodref :
254 // fall through
255 case JVM_CONSTANT_InterfaceMethodref : {
256 if (!_need_verify) break;
257 int klass_ref_index = cp->klass_ref_index_at(index);
258 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
259 check_property(valid_cp_range(klass_ref_index, length) &&
260 is_klass_reference(cp, klass_ref_index),
261 "Invalid constant pool index %u in class file %s",
262 klass_ref_index,
263 CHECK_(nullHandle));
264 check_property(valid_cp_range(name_and_type_ref_index, length) &&
265 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
266 "Invalid constant pool index %u in class file %s",
267 name_and_type_ref_index,
268 CHECK_(nullHandle));
269 break;
270 }
271 case JVM_CONSTANT_String :
272 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
273 break;
274 case JVM_CONSTANT_Integer :
275 break;
276 case JVM_CONSTANT_Float :
277 break;
278 case JVM_CONSTANT_Long :
279 case JVM_CONSTANT_Double :
280 index++;
281 check_property(
282 (index < length && cp->tag_at(index).is_invalid()),
283 "Improper constant pool long/double index %u in class file %s",
284 index, CHECK_(nullHandle));
285 break;
286 case JVM_CONSTANT_NameAndType : {
287 if (!_need_verify) break;
288 int name_ref_index = cp->name_ref_index_at(index);
289 int signature_ref_index = cp->signature_ref_index_at(index);
290 check_property(
291 valid_cp_range(name_ref_index, length) &&
292 cp->tag_at(name_ref_index).is_utf8(),
293 "Invalid constant pool index %u in class file %s",
294 name_ref_index, CHECK_(nullHandle));
295 check_property(
296 valid_cp_range(signature_ref_index, length) &&
297 cp->tag_at(signature_ref_index).is_utf8(),
298 "Invalid constant pool index %u in class file %s",
299 signature_ref_index, CHECK_(nullHandle));
300 break;
301 }
302 case JVM_CONSTANT_Utf8 :
303 break;
304 case JVM_CONSTANT_UnresolvedClass : // fall-through
305 case JVM_CONSTANT_UnresolvedClassInError:
306 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
307 break;
308 case JVM_CONSTANT_ClassIndex :
309 {
310 int class_index = cp->klass_index_at(index);
311 check_property(
312 valid_cp_range(class_index, length) &&
313 cp->tag_at(class_index).is_utf8(),
314 "Invalid constant pool index %u in class file %s",
315 class_index, CHECK_(nullHandle));
316 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
317 }
318 break;
319 case JVM_CONSTANT_UnresolvedString :
320 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
321 break;
322 case JVM_CONSTANT_StringIndex :
323 {
324 int string_index = cp->string_index_at(index);
325 check_property(
326 valid_cp_range(string_index, length) &&
327 cp->tag_at(string_index).is_utf8(),
328 "Invalid constant pool index %u in class file %s",
329 string_index, CHECK_(nullHandle));
330 symbolOop sym = cp->symbol_at(string_index);
331 cp->unresolved_string_at_put(index, sym);
332 }
333 break;
334 default:
335 fatal1("bad constant pool tag value %u", cp->tag_at(index).value());
336 ShouldNotReachHere();
337 break;
338 } // end of switch
339 } // end of for
340
341 if (_cp_patches != NULL) {
342 // need to treat this_class specially...
343 assert(AnonymousClasses, "");
344 int this_class_index;
345 {
346 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
347 u1* mark = cfs->current();
348 u2 flags = cfs->get_u2_fast();
349 this_class_index = cfs->get_u2_fast();
350 cfs->set_current(mark); // revert to mark
351 }
352
353 for (index = 1; index < length; index++) { // Index 0 is unused
354 if (has_cp_patch_at(index)) {
355 guarantee_property(index != this_class_index,
356 "Illegal constant pool patch to self at %d in class file %s",
357 index, CHECK_(nullHandle));
358 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
359 }
360 }
361 // Ensure that all the patches have been used.
362 for (index = 0; index < _cp_patches->length(); index++) {
363 guarantee_property(!has_cp_patch_at(index),
364 "Unused constant pool patch at %d in class file %s",
365 index, CHECK_(nullHandle));
366 }
367 }
368
369 if (!_need_verify) {
370 return cp;
371 }
372
373 // second verification pass - checks the strings are of the right format.
374 // but not yet to the other entries
375 for (index = 1; index < length; index++) {
376 jbyte tag = cp->tag_at(index).value();
377 switch (tag) {
378 case JVM_CONSTANT_UnresolvedClass: {
379 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
380 // check the name, even if _cp_patches will overwrite it
381 verify_legal_class_name(class_name, CHECK_(nullHandle));
382 break;
383 }
384 case JVM_CONSTANT_Fieldref:
385 case JVM_CONSTANT_Methodref:
386 case JVM_CONSTANT_InterfaceMethodref: {
387 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
388 // already verified to be utf8
389 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
390 // already verified to be utf8
391 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
392 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
393 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
394 if (tag == JVM_CONSTANT_Fieldref) {
395 verify_legal_field_name(name, CHECK_(nullHandle));
396 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
397 } else {
398 verify_legal_method_name(name, CHECK_(nullHandle));
399 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
400 if (tag == JVM_CONSTANT_Methodref) {
401 // 4509014: If a class method name begins with '<', it must be "<init>".
402 assert(!name.is_null(), "method name in constant pool is null");
403 unsigned int name_len = name->utf8_length();
404 assert(name_len > 0, "bad method name"); // already verified as legal name
405 if (name->byte_at(0) == '<') {
406 if (name() != vmSymbols::object_initializer_name()) {
407 classfile_parse_error(
408 "Bad method name at constant pool index %u in class file %s",
409 name_ref_index, CHECK_(nullHandle));
410 }
411 }
412 }
413 }
414 break;
415 }
416 } // end of switch
417 } // end of for
418
419 return cp;
420 }
421
422
423 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
424 assert(AnonymousClasses, "");
425 BasicType patch_type = T_VOID;
426 switch (cp->tag_at(index).value()) {
427
428 case JVM_CONSTANT_UnresolvedClass :
429 // Patching a class means pre-resolving it.
430 // The name in the constant pool is ignored.
431 if (patch->klass() == SystemDictionary::class_klass()) { // %%% java_lang_Class::is_instance
432 guarantee_property(!java_lang_Class::is_primitive(patch()),
433 "Illegal class patch at %d in class file %s",
434 index, CHECK);
435 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
436 } else {
437 guarantee_property(java_lang_String::is_instance(patch()),
438 "Illegal class patch at %d in class file %s",
439 index, CHECK);
440 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
441 cp->unresolved_klass_at_put(index, name());
442 }
443 break;
444
445 case JVM_CONSTANT_UnresolvedString :
446 // Patching a string means pre-resolving it.
447 // The spelling in the constant pool is ignored.
448 // The constant reference may be any object whatever.
449 // If it is not a real interned string, the constant is referred
450 // to as a "pseudo-string", and must be presented to the CP
451 // explicitly, because it may require scavenging.
452 cp->pseudo_string_at_put(index, patch());
453 break;
454
455 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
456 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
457 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
458 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
459 patch_prim:
460 {
461 jvalue value;
462 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
463 guarantee_property(value_type == patch_type,
464 "Illegal primitive patch at %d in class file %s",
465 index, CHECK);
466 switch (value_type) {
467 case T_INT: cp->int_at_put(index, value.i); break;
468 case T_FLOAT: cp->float_at_put(index, value.f); break;
469 case T_LONG: cp->long_at_put(index, value.j); break;
470 case T_DOUBLE: cp->double_at_put(index, value.d); break;
471 default: assert(false, "");
472 }
473 }
474 break;
475
476 default:
477 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
478 guarantee_property(!has_cp_patch_at(index),
479 "Illegal unexpected patch at %d in class file %s",
480 index, CHECK);
481 return;
482 }
483
484 // On fall-through, mark the patch as used.
485 clear_cp_patch_at(index);
486 }
487
488
489
490 class NameSigHash: public ResourceObj {
491 public:
492 symbolOop _name; // name
493 symbolOop _sig; // signature
494 NameSigHash* _next; // Next entry in hash table
495 };
496
497
498 #define HASH_ROW_SIZE 256
499
500 unsigned int hash(symbolOop name, symbolOop sig) {
501 unsigned int raw_hash = 0;
502 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
503 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
504
505 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
506 }
507
508
509 void initialize_hashtable(NameSigHash** table) {
510 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
511 }
512
513 // Return false if the name/sig combination is found in table.
514 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
515 // The old format checker uses heap sort to find duplicates.
516 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
517 // of table since we don't expect symbolOop's to move.
518 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
519 assert(name != NULL, "name in constant pool is NULL");
520
521 // First lookup for duplicates
522 int index = hash(name, sig);
523 NameSigHash* entry = table[index];
524 while (entry != NULL) {
525 if (entry->_name == name && entry->_sig == sig) {
526 return false;
527 }
528 entry = entry->_next;
529 }
530
531 // No duplicate is found, allocate a new entry and fill it.
532 entry = new NameSigHash();
533 entry->_name = name;
534 entry->_sig = sig;
535
536 // Insert into hash table
537 entry->_next = table[index];
538 table[index] = entry;
539
540 return true;
541 }
542
543
544 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
545 int length,
546 Handle class_loader,
547 Handle protection_domain,
548 PerfTraceTime* vmtimer,
549 symbolHandle class_name,
550 TRAPS) {
551 ClassFileStream* cfs = stream();
552 assert(length > 0, "only called for length>0");
553 objArrayHandle nullHandle;
554 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
555 objArrayHandle interfaces (THREAD, interface_oop);
556
557 int index;
558 for (index = 0; index < length; index++) {
559 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
560 KlassHandle interf;
561 check_property(
562 valid_cp_range(interface_index, cp->length()) &&
563 is_klass_reference(cp, interface_index),
564 "Interface name has bad constant pool index %u in class file %s",
565 interface_index, CHECK_(nullHandle));
566 if (cp->tag_at(interface_index).is_klass()) {
567 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
568 } else {
569 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
570
571 // Don't need to check legal name because it's checked when parsing constant pool.
572 // But need to make sure it's not an array type.
573 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
574 "Bad interface name in class file %s", CHECK_(nullHandle));
575
576 vmtimer->suspend(); // do not count recursive loading twice
577 // Call resolve_super so classcircularity is checked
578 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
579 unresolved_klass, class_loader, protection_domain,
580 false, CHECK_(nullHandle));
581 interf = KlassHandle(THREAD, k);
582 vmtimer->resume();
583
584 cp->klass_at_put(interface_index, interf()); // eagerly resolve
585 }
586
587 if (!Klass::cast(interf())->is_interface()) {
588 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
589 }
590 interfaces->obj_at_put(index, interf());
591 }
592
593 if (!_need_verify || length <= 1) {
594 return interfaces;
595 }
596
597 // Check if there's any duplicates in interfaces
598 ResourceMark rm(THREAD);
599 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
600 THREAD, NameSigHash*, HASH_ROW_SIZE);
601 initialize_hashtable(interface_names);
602 bool dup = false;
603 {
604 debug_only(No_Safepoint_Verifier nsv;)
605 for (index = 0; index < length; index++) {
606 klassOop k = (klassOop)interfaces->obj_at(index);
607 symbolOop name = instanceKlass::cast(k)->name();
608 // If no duplicates, add (name, NULL) in hashtable interface_names.
609 if (!put_after_lookup(name, NULL, interface_names)) {
610 dup = true;
611 break;
612 }
613 }
614 }
615 if (dup) {
616 classfile_parse_error("Duplicate interface name in class file %s",
617 CHECK_(nullHandle));
618 }
619
620 return interfaces;
621 }
622
623
624 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
625 // Make sure the constant pool entry is of a type appropriate to this field
626 guarantee_property(
627 (constantvalue_index > 0 &&
628 constantvalue_index < cp->length()),
629 "Bad initial value index %u in ConstantValue attribute in class file %s",
630 constantvalue_index, CHECK);
631 constantTag value_type = cp->tag_at(constantvalue_index);
632 switch ( cp->basic_type_for_signature_at(signature_index) ) {
633 case T_LONG:
634 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
635 break;
636 case T_FLOAT:
637 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
638 break;
639 case T_DOUBLE:
640 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
641 break;
642 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
643 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
644 break;
645 case T_OBJECT:
646 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18)
647 && (value_type.is_string() || value_type.is_unresolved_string())),
648 "Bad string initial value in class file %s", CHECK);
649 break;
650 default:
651 classfile_parse_error(
652 "Unable to set initial value %u in class file %s",
653 constantvalue_index, CHECK);
654 }
655 }
656
657
658 // Parse attributes for a field.
659 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
660 u2 attributes_count,
661 bool is_static, u2 signature_index,
662 u2* constantvalue_index_addr,
663 bool* is_synthetic_addr,
664 u2* generic_signature_index_addr,
665 typeArrayHandle* field_annotations,
666 TRAPS) {
667 ClassFileStream* cfs = stream();
668 assert(attributes_count > 0, "length should be greater than 0");
669 u2 constantvalue_index = 0;
670 u2 generic_signature_index = 0;
671 bool is_synthetic = false;
672 u1* runtime_visible_annotations = NULL;
673 int runtime_visible_annotations_length = 0;
674 u1* runtime_invisible_annotations = NULL;
675 int runtime_invisible_annotations_length = 0;
676 while (attributes_count--) {
677 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
678 u2 attribute_name_index = cfs->get_u2_fast();
679 u4 attribute_length = cfs->get_u4_fast();
680 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
681 cp->tag_at(attribute_name_index).is_utf8(),
682 "Invalid field attribute index %u in class file %s",
683 attribute_name_index,
684 CHECK);
685 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
686 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
687 // ignore if non-static
688 if (constantvalue_index != 0) {
689 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
690 }
691 check_property(
692 attribute_length == 2,
693 "Invalid ConstantValue field attribute length %u in class file %s",
694 attribute_length, CHECK);
695 constantvalue_index = cfs->get_u2(CHECK);
696 if (_need_verify) {
697 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
698 }
699 } else if (attribute_name == vmSymbols::tag_synthetic()) {
700 if (attribute_length != 0) {
701 classfile_parse_error(
702 "Invalid Synthetic field attribute length %u in class file %s",
703 attribute_length, CHECK);
704 }
705 is_synthetic = true;
706 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
707 if (attribute_length != 0) {
708 classfile_parse_error(
709 "Invalid Deprecated field attribute length %u in class file %s",
710 attribute_length, CHECK);
711 }
712 } else if (_major_version >= JAVA_1_5_VERSION) {
713 if (attribute_name == vmSymbols::tag_signature()) {
714 if (attribute_length != 2) {
715 classfile_parse_error(
716 "Wrong size %u for field's Signature attribute in class file %s",
717 attribute_length, CHECK);
718 }
719 generic_signature_index = cfs->get_u2(CHECK);
720 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
721 runtime_visible_annotations_length = attribute_length;
722 runtime_visible_annotations = cfs->get_u1_buffer();
723 assert(runtime_visible_annotations != NULL, "null visible annotations");
724 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
725 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
726 runtime_invisible_annotations_length = attribute_length;
727 runtime_invisible_annotations = cfs->get_u1_buffer();
728 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
729 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
730 } else {
731 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
732 }
733 } else {
734 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
735 }
736 }
737
738 *constantvalue_index_addr = constantvalue_index;
739 *is_synthetic_addr = is_synthetic;
740 *generic_signature_index_addr = generic_signature_index;
741 *field_annotations = assemble_annotations(runtime_visible_annotations,
742 runtime_visible_annotations_length,
743 runtime_invisible_annotations,
744 runtime_invisible_annotations_length,
745 CHECK);
746 return;
747 }
748
749
750 // Field allocation types. Used for computing field offsets.
751
752 enum FieldAllocationType {
753 STATIC_OOP, // Oops
754 STATIC_BYTE, // Boolean, Byte, char
755 STATIC_SHORT, // shorts
756 STATIC_WORD, // ints
757 STATIC_DOUBLE, // long or double
758 STATIC_ALIGNED_DOUBLE,// aligned long or double
759 NONSTATIC_OOP,
760 NONSTATIC_BYTE,
761 NONSTATIC_SHORT,
762 NONSTATIC_WORD,
763 NONSTATIC_DOUBLE,
764 NONSTATIC_ALIGNED_DOUBLE
765 };
766
767
768 struct FieldAllocationCount {
769 int static_oop_count;
770 int static_byte_count;
771 int static_short_count;
772 int static_word_count;
773 int static_double_count;
774 int nonstatic_oop_count;
775 int nonstatic_byte_count;
776 int nonstatic_short_count;
777 int nonstatic_word_count;
778 int nonstatic_double_count;
779 };
780
781 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
782 struct FieldAllocationCount *fac,
783 objArrayHandle* fields_annotations, TRAPS) {
784 ClassFileStream* cfs = stream();
785 typeArrayHandle nullHandle;
786 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
787 u2 length = cfs->get_u2_fast();
788 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
789 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
790 typeArrayHandle fields(THREAD, new_fields);
791
792 int index = 0;
793 typeArrayHandle field_annotations;
794 for (int n = 0; n < length; n++) {
795 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
796
797 AccessFlags access_flags;
798 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
799 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
800 access_flags.set_flags(flags);
801
802 u2 name_index = cfs->get_u2_fast();
803 int cp_size = cp->length();
804 check_property(
805 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
806 "Invalid constant pool index %u for field name in class file %s",
807 name_index, CHECK_(nullHandle));
808 symbolHandle name(THREAD, cp->symbol_at(name_index));
809 verify_legal_field_name(name, CHECK_(nullHandle));
810
811 u2 signature_index = cfs->get_u2_fast();
812 check_property(
813 valid_cp_range(signature_index, cp_size) &&
814 cp->tag_at(signature_index).is_utf8(),
815 "Invalid constant pool index %u for field signature in class file %s",
816 signature_index, CHECK_(nullHandle));
817 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
818 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
819
820 u2 constantvalue_index = 0;
821 bool is_synthetic = false;
822 u2 generic_signature_index = 0;
823 bool is_static = access_flags.is_static();
824
825 u2 attributes_count = cfs->get_u2_fast();
826 if (attributes_count > 0) {
827 parse_field_attributes(cp, attributes_count, is_static, signature_index,
828 &constantvalue_index, &is_synthetic,
829 &generic_signature_index, &field_annotations,
830 CHECK_(nullHandle));
831 if (field_annotations.not_null()) {
832 if (fields_annotations->is_null()) {
833 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
834 *fields_annotations = objArrayHandle(THREAD, md);
835 }
836 (*fields_annotations)->obj_at_put(n, field_annotations());
837 }
838 if (is_synthetic) {
839 access_flags.set_is_synthetic();
840 }
841 }
842
843 fields->short_at_put(index++, access_flags.as_short());
844 fields->short_at_put(index++, name_index);
845 fields->short_at_put(index++, signature_index);
846 fields->short_at_put(index++, constantvalue_index);
847
848 // Remember how many oops we encountered and compute allocation type
849 BasicType type = cp->basic_type_for_signature_at(signature_index);
850 FieldAllocationType atype;
851 if ( is_static ) {
852 switch ( type ) {
853 case T_BOOLEAN:
854 case T_BYTE:
855 fac->static_byte_count++;
856 atype = STATIC_BYTE;
857 break;
858 case T_LONG:
859 case T_DOUBLE:
860 if (Universe::field_type_should_be_aligned(type)) {
861 atype = STATIC_ALIGNED_DOUBLE;
862 } else {
863 atype = STATIC_DOUBLE;
864 }
865 fac->static_double_count++;
866 break;
867 case T_CHAR:
868 case T_SHORT:
869 fac->static_short_count++;
870 atype = STATIC_SHORT;
871 break;
872 case T_FLOAT:
873 case T_INT:
874 fac->static_word_count++;
875 atype = STATIC_WORD;
876 break;
877 case T_ARRAY:
878 case T_OBJECT:
879 fac->static_oop_count++;
880 atype = STATIC_OOP;
881 break;
882 case T_ADDRESS:
883 case T_VOID:
884 default:
885 assert(0, "bad field type");
886 }
887 } else {
888 switch ( type ) {
889 case T_BOOLEAN:
890 case T_BYTE:
891 fac->nonstatic_byte_count++;
892 atype = NONSTATIC_BYTE;
893 break;
894 case T_LONG:
895 case T_DOUBLE:
896 if (Universe::field_type_should_be_aligned(type)) {
897 atype = NONSTATIC_ALIGNED_DOUBLE;
898 } else {
899 atype = NONSTATIC_DOUBLE;
900 }
901 fac->nonstatic_double_count++;
902 break;
903 case T_CHAR:
904 case T_SHORT:
905 fac->nonstatic_short_count++;
906 atype = NONSTATIC_SHORT;
907 break;
908 case T_FLOAT:
909 case T_INT:
910 fac->nonstatic_word_count++;
911 atype = NONSTATIC_WORD;
912 break;
913 case T_ARRAY:
914 case T_OBJECT:
915 fac->nonstatic_oop_count++;
916 atype = NONSTATIC_OOP;
917 break;
918 case T_ADDRESS:
919 case T_VOID:
920 default:
921 assert(0, "bad field type");
922 }
923 }
924
925 // The correct offset is computed later (all oop fields will be located together)
926 // We temporarily store the allocation type in the offset field
927 fields->short_at_put(index++, atype);
928 fields->short_at_put(index++, 0); // Clear out high word of byte offset
929 fields->short_at_put(index++, generic_signature_index);
930 }
931
932 if (_need_verify && length > 1) {
933 // Check duplicated fields
934 ResourceMark rm(THREAD);
935 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
936 THREAD, NameSigHash*, HASH_ROW_SIZE);
937 initialize_hashtable(names_and_sigs);
938 bool dup = false;
939 {
940 debug_only(No_Safepoint_Verifier nsv;)
941 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
942 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
943 symbolOop name = cp->symbol_at(name_index);
944 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
945 symbolOop sig = cp->symbol_at(sig_index);
946 // If no duplicates, add name/signature in hashtable names_and_sigs.
947 if (!put_after_lookup(name, sig, names_and_sigs)) {
948 dup = true;
949 break;
950 }
951 }
952 }
953 if (dup) {
954 classfile_parse_error("Duplicate field name&signature in class file %s",
955 CHECK_(nullHandle));
956 }
957 }
958
959 return fields;
960 }
961
962
963 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
964 while (length-- > 0) {
965 *dest++ = Bytes::get_Java_u2((u1*) (src++));
966 }
967 }
968
969
970 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
971 u4 exception_table_length,
972 constantPoolHandle cp,
973 TRAPS) {
974 ClassFileStream* cfs = stream();
975 typeArrayHandle nullHandle;
976
977 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
978 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
979 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
980
981 int index = 0;
982 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
983 for (unsigned int i = 0; i < exception_table_length; i++) {
984 u2 start_pc = cfs->get_u2_fast();
985 u2 end_pc = cfs->get_u2_fast();
986 u2 handler_pc = cfs->get_u2_fast();
987 u2 catch_type_index = cfs->get_u2_fast();
988 // Will check legal target after parsing code array in verifier.
989 if (_need_verify) {
990 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
991 "Illegal exception table range in class file %s", CHECK_(nullHandle));
992 guarantee_property(handler_pc < code_length,
993 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
994 if (catch_type_index != 0) {
995 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
996 is_klass_reference(cp, catch_type_index),
997 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
998 }
999 }
1000 exception_handlers->int_at_put(index++, start_pc);
1001 exception_handlers->int_at_put(index++, end_pc);
1002 exception_handlers->int_at_put(index++, handler_pc);
1003 exception_handlers->int_at_put(index++, catch_type_index);
1004 }
1005 return exception_handlers;
1006 }
1007
1008 void ClassFileParser::parse_linenumber_table(
1009 u4 code_attribute_length, u4 code_length,
1010 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1011 ClassFileStream* cfs = stream();
1012 unsigned int num_entries = cfs->get_u2(CHECK);
1013
1014 // Each entry is a u2 start_pc, and a u2 line_number
1015 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1016
1017 // Verify line number attribute and table length
1018 check_property(
1019 code_attribute_length == sizeof(u2) + length_in_bytes,
1020 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1021
1022 cfs->guarantee_more(length_in_bytes, CHECK);
1023
1024 if ((*write_stream) == NULL) {
1025 if (length_in_bytes > fixed_buffer_size) {
1026 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1027 } else {
1028 (*write_stream) = new CompressedLineNumberWriteStream(
1029 linenumbertable_buffer, fixed_buffer_size);
1030 }
1031 }
1032
1033 while (num_entries-- > 0) {
1034 u2 bci = cfs->get_u2_fast(); // start_pc
1035 u2 line = cfs->get_u2_fast(); // line_number
1036 guarantee_property(bci < code_length,
1037 "Invalid pc in LineNumberTable in class file %s", CHECK);
1038 (*write_stream)->write_pair(bci, line);
1039 }
1040 }
1041
1042
1043 // Class file LocalVariableTable elements.
1044 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1045 public:
1046 u2 start_bci;
1047 u2 length;
1048 u2 name_cp_index;
1049 u2 descriptor_cp_index;
1050 u2 slot;
1051 };
1052
1053
1054 class LVT_Hash: public CHeapObj {
1055 public:
1056 LocalVariableTableElement *_elem; // element
1057 LVT_Hash* _next; // Next entry in hash table
1058 };
1059
1060 unsigned int hash(LocalVariableTableElement *elem) {
1061 unsigned int raw_hash = elem->start_bci;
1062
1063 raw_hash = elem->length + raw_hash * 37;
1064 raw_hash = elem->name_cp_index + raw_hash * 37;
1065 raw_hash = elem->slot + raw_hash * 37;
1066
1067 return raw_hash % HASH_ROW_SIZE;
1068 }
1069
1070 void initialize_hashtable(LVT_Hash** table) {
1071 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1072 table[i] = NULL;
1073 }
1074 }
1075
1076 void clear_hashtable(LVT_Hash** table) {
1077 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1078 LVT_Hash* current = table[i];
1079 LVT_Hash* next;
1080 while (current != NULL) {
1081 next = current->_next;
1082 current->_next = NULL;
1083 delete(current);
1084 current = next;
1085 }
1086 table[i] = NULL;
1087 }
1088 }
1089
1090 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1091 LVT_Hash* entry = table[index];
1092
1093 /*
1094 * 3-tuple start_bci/length/slot has to be unique key,
1095 * so the following comparison seems to be redundant:
1096 * && elem->name_cp_index == entry->_elem->name_cp_index
1097 */
1098 while (entry != NULL) {
1099 if (elem->start_bci == entry->_elem->start_bci
1100 && elem->length == entry->_elem->length
1101 && elem->name_cp_index == entry->_elem->name_cp_index
1102 && elem->slot == entry->_elem->slot
1103 ) {
1104 return entry;
1105 }
1106 entry = entry->_next;
1107 }
1108 return NULL;
1109 }
1110
1111 // Return false if the local variable is found in table.
1112 // Return true if no duplicate is found.
1113 // And local variable is added as a new entry in table.
1114 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1115 // First lookup for duplicates
1116 int index = hash(elem);
1117 LVT_Hash* entry = LVT_lookup(elem, index, table);
1118
1119 if (entry != NULL) {
1120 return false;
1121 }
1122 // No duplicate is found, allocate a new entry and fill it.
1123 if ((entry = new LVT_Hash()) == NULL) {
1124 return false;
1125 }
1126 entry->_elem = elem;
1127
1128 // Insert into hash table
1129 entry->_next = table[index];
1130 table[index] = entry;
1131
1132 return true;
1133 }
1134
1135 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1136 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1137 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1138 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1139 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1140 lvt->signature_cp_index = 0;
1141 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1142 }
1143
1144 // Function is used to parse both attributes:
1145 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1146 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1147 u2 max_locals,
1148 u4 code_attribute_length,
1149 constantPoolHandle cp,
1150 u2* localvariable_table_length,
1151 bool isLVTT,
1152 TRAPS) {
1153 ClassFileStream* cfs = stream();
1154 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1155 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1156 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1157 // Verify local variable table attribute has right length
1158 if (_need_verify) {
1159 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1160 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1161 }
1162 u2* localvariable_table_start = cfs->get_u2_buffer();
1163 assert(localvariable_table_start != NULL, "null local variable table");
1164 if (!_need_verify) {
1165 cfs->skip_u2_fast(size);
1166 } else {
1167 cfs->guarantee_more(size * 2, CHECK_NULL);
1168 for(int i = 0; i < (*localvariable_table_length); i++) {
1169 u2 start_pc = cfs->get_u2_fast();
1170 u2 length = cfs->get_u2_fast();
1171 u2 name_index = cfs->get_u2_fast();
1172 u2 descriptor_index = cfs->get_u2_fast();
1173 u2 index = cfs->get_u2_fast();
1174 // Assign to a u4 to avoid overflow
1175 u4 end_pc = (u4)start_pc + (u4)length;
1176
1177 if (start_pc >= code_length) {
1178 classfile_parse_error(
1179 "Invalid start_pc %u in %s in class file %s",
1180 start_pc, tbl_name, CHECK_NULL);
1181 }
1182 if (end_pc > code_length) {
1183 classfile_parse_error(
1184 "Invalid length %u in %s in class file %s",
1185 length, tbl_name, CHECK_NULL);
1186 }
1187 int cp_size = cp->length();
1188 guarantee_property(
1189 valid_cp_range(name_index, cp_size) &&
1190 cp->tag_at(name_index).is_utf8(),
1191 "Name index %u in %s has bad constant type in class file %s",
1192 name_index, tbl_name, CHECK_NULL);
1193 guarantee_property(
1194 valid_cp_range(descriptor_index, cp_size) &&
1195 cp->tag_at(descriptor_index).is_utf8(),
1196 "Signature index %u in %s has bad constant type in class file %s",
1197 descriptor_index, tbl_name, CHECK_NULL);
1198
1199 symbolHandle name(THREAD, cp->symbol_at(name_index));
1200 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1201 verify_legal_field_name(name, CHECK_NULL);
1202 u2 extra_slot = 0;
1203 if (!isLVTT) {
1204 verify_legal_field_signature(name, sig, CHECK_NULL);
1205
1206 // 4894874: check special cases for double and long local variables
1207 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1208 sig() == vmSymbols::type_signature(T_LONG)) {
1209 extra_slot = 1;
1210 }
1211 }
1212 guarantee_property((index + extra_slot) < max_locals,
1213 "Invalid index %u in %s in class file %s",
1214 index, tbl_name, CHECK_NULL);
1215 }
1216 }
1217 return localvariable_table_start;
1218 }
1219
1220
1221 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1222 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1223 ClassFileStream* cfs = stream();
1224 u2 index = 0; // index in the array with long/double occupying two slots
1225 u4 i1 = *u1_index;
1226 u4 i2 = *u2_index + 1;
1227 for(int i = 0; i < array_length; i++) {
1228 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1229 index++;
1230 if (tag == ITEM_Long || tag == ITEM_Double) {
1231 index++;
1232 } else if (tag == ITEM_Object) {
1233 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1234 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1235 is_klass_reference(cp, class_index),
1236 "Bad class index %u in StackMap in class file %s",
1237 class_index, CHECK);
1238 } else if (tag == ITEM_Uninitialized) {
1239 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1240 guarantee_property(
1241 offset < code_length,
1242 "Bad uninitialized type offset %u in StackMap in class file %s",
1243 offset, CHECK);
1244 } else {
1245 guarantee_property(
1246 tag <= (u1)ITEM_Uninitialized,
1247 "Unknown variable type %u in StackMap in class file %s",
1248 tag, CHECK);
1249 }
1250 }
1251 u2_array[*u2_index] = index;
1252 *u1_index = i1;
1253 *u2_index = i2;
1254 }
1255
1256 typeArrayOop ClassFileParser::parse_stackmap_table(
1257 u4 code_attribute_length, TRAPS) {
1258 if (code_attribute_length == 0)
1259 return NULL;
1260
1261 ClassFileStream* cfs = stream();
1262 u1* stackmap_table_start = cfs->get_u1_buffer();
1263 assert(stackmap_table_start != NULL, "null stackmap table");
1264
1265 // check code_attribute_length first
1266 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1267
1268 if (!_need_verify && !DumpSharedSpaces) {
1269 return NULL;
1270 }
1271
1272 typeArrayOop stackmap_data =
1273 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1274
1275 stackmap_data->set_length(code_attribute_length);
1276 memcpy((void*)stackmap_data->byte_at_addr(0),
1277 (void*)stackmap_table_start, code_attribute_length);
1278 return stackmap_data;
1279 }
1280
1281 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1282 u4 method_attribute_length,
1283 constantPoolHandle cp, TRAPS) {
1284 ClassFileStream* cfs = stream();
1285 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1286 *checked_exceptions_length = cfs->get_u2_fast();
1287 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1288 u2* checked_exceptions_start = cfs->get_u2_buffer();
1289 assert(checked_exceptions_start != NULL, "null checked exceptions");
1290 if (!_need_verify) {
1291 cfs->skip_u2_fast(size);
1292 } else {
1293 // Verify each value in the checked exception table
1294 u2 checked_exception;
1295 u2 len = *checked_exceptions_length;
1296 cfs->guarantee_more(2 * len, CHECK_NULL);
1297 for (int i = 0; i < len; i++) {
1298 checked_exception = cfs->get_u2_fast();
1299 check_property(
1300 valid_cp_range(checked_exception, cp->length()) &&
1301 is_klass_reference(cp, checked_exception),
1302 "Exception name has bad type at constant pool %u in class file %s",
1303 checked_exception, CHECK_NULL);
1304 }
1305 }
1306 // check exceptions attribute length
1307 if (_need_verify) {
1308 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1309 sizeof(u2) * size),
1310 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1311 }
1312 return checked_exceptions_start;
1313 }
1314
1315
1316 #define MAX_ARGS_SIZE 255
1317 #define MAX_CODE_SIZE 65535
1318 #define INITIAL_MAX_LVT_NUMBER 256
1319
1320 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1321 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1322 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1323 // entire method attribute is parsed.
1324 //
1325 // The promoted_flags parameter is used to pass relevant access_flags
1326 // from the method back up to the containing klass. These flag values
1327 // are added to klass's access_flags.
1328
1329 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1330 AccessFlags *promoted_flags,
1331 typeArrayHandle* method_annotations,
1332 typeArrayHandle* method_parameter_annotations,
1333 typeArrayHandle* method_default_annotations,
1334 TRAPS) {
1335 ClassFileStream* cfs = stream();
1336 methodHandle nullHandle;
1337 ResourceMark rm(THREAD);
1338 // Parse fixed parts
1339 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1340
1341 int flags = cfs->get_u2_fast();
1342 u2 name_index = cfs->get_u2_fast();
1343 int cp_size = cp->length();
1344 check_property(
1345 valid_cp_range(name_index, cp_size) &&
1346 cp->tag_at(name_index).is_utf8(),
1347 "Illegal constant pool index %u for method name in class file %s",
1348 name_index, CHECK_(nullHandle));
1349 symbolHandle name(THREAD, cp->symbol_at(name_index));
1350 verify_legal_method_name(name, CHECK_(nullHandle));
1351
1352 u2 signature_index = cfs->get_u2_fast();
1353 guarantee_property(
1354 valid_cp_range(signature_index, cp_size) &&
1355 cp->tag_at(signature_index).is_utf8(),
1356 "Illegal constant pool index %u for method signature in class file %s",
1357 signature_index, CHECK_(nullHandle));
1358 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1359
1360 AccessFlags access_flags;
1361 if (name == vmSymbols::class_initializer_name()) {
1362 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1363 flags = JVM_ACC_STATIC;
1364 } else {
1365 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1366 }
1367
1368 int args_size = -1; // only used when _need_verify is true
1369 if (_need_verify) {
1370 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1371 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1372 if (args_size > MAX_ARGS_SIZE) {
1373 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1374 }
1375 }
1376
1377 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1378
1379 // Default values for code and exceptions attribute elements
1380 u2 max_stack = 0;
1381 u2 max_locals = 0;
1382 u4 code_length = 0;
1383 u1* code_start = 0;
1384 u2 exception_table_length = 0;
1385 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1386 u2 checked_exceptions_length = 0;
1387 u2* checked_exceptions_start = NULL;
1388 CompressedLineNumberWriteStream* linenumber_table = NULL;
1389 int linenumber_table_length = 0;
1390 int total_lvt_length = 0;
1391 u2 lvt_cnt = 0;
1392 u2 lvtt_cnt = 0;
1393 bool lvt_allocated = false;
1394 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1395 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1396 u2* localvariable_table_length;
1397 u2** localvariable_table_start;
1398 u2* localvariable_type_table_length;
1399 u2** localvariable_type_table_start;
1400 bool parsed_code_attribute = false;
1401 bool parsed_checked_exceptions_attribute = false;
1402 bool parsed_stackmap_attribute = false;
1403 // stackmap attribute - JDK1.5
1404 typeArrayHandle stackmap_data;
1405 u2 generic_signature_index = 0;
1406 u1* runtime_visible_annotations = NULL;
1407 int runtime_visible_annotations_length = 0;
1408 u1* runtime_invisible_annotations = NULL;
1409 int runtime_invisible_annotations_length = 0;
1410 u1* runtime_visible_parameter_annotations = NULL;
1411 int runtime_visible_parameter_annotations_length = 0;
1412 u1* runtime_invisible_parameter_annotations = NULL;
1413 int runtime_invisible_parameter_annotations_length = 0;
1414 u1* annotation_default = NULL;
1415 int annotation_default_length = 0;
1416
1417 // Parse code and exceptions attribute
1418 u2 method_attributes_count = cfs->get_u2_fast();
1419 while (method_attributes_count--) {
1420 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1421 u2 method_attribute_name_index = cfs->get_u2_fast();
1422 u4 method_attribute_length = cfs->get_u4_fast();
1423 check_property(
1424 valid_cp_range(method_attribute_name_index, cp_size) &&
1425 cp->tag_at(method_attribute_name_index).is_utf8(),
1426 "Invalid method attribute name index %u in class file %s",
1427 method_attribute_name_index, CHECK_(nullHandle));
1428
1429 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1430 if (method_attribute_name == vmSymbols::tag_code()) {
1431 // Parse Code attribute
1432 if (_need_verify) {
1433 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1434 "Code attribute in native or abstract methods in class file %s",
1435 CHECK_(nullHandle));
1436 }
1437 if (parsed_code_attribute) {
1438 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1439 }
1440 parsed_code_attribute = true;
1441
1442 // Stack size, locals size, and code size
1443 if (_major_version == 45 && _minor_version <= 2) {
1444 cfs->guarantee_more(4, CHECK_(nullHandle));
1445 max_stack = cfs->get_u1_fast();
1446 max_locals = cfs->get_u1_fast();
1447 code_length = cfs->get_u2_fast();
1448 } else {
1449 cfs->guarantee_more(8, CHECK_(nullHandle));
1450 max_stack = cfs->get_u2_fast();
1451 max_locals = cfs->get_u2_fast();
1452 code_length = cfs->get_u4_fast();
1453 }
1454 if (_need_verify) {
1455 guarantee_property(args_size <= max_locals,
1456 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1457 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1458 "Invalid method Code length %u in class file %s",
1459 code_length, CHECK_(nullHandle));
1460 }
1461 // Code pointer
1462 code_start = cfs->get_u1_buffer();
1463 assert(code_start != NULL, "null code start");
1464 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1465 cfs->skip_u1_fast(code_length);
1466
1467 // Exception handler table
1468 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1469 exception_table_length = cfs->get_u2_fast();
1470 if (exception_table_length > 0) {
1471 exception_handlers =
1472 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1473 }
1474
1475 // Parse additional attributes in code attribute
1476 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1477 u2 code_attributes_count = cfs->get_u2_fast();
1478
1479 unsigned int calculated_attribute_length = 0;
1480
1481 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1482 calculated_attribute_length =
1483 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1484 } else {
1485 // max_stack, locals and length are smaller in pre-version 45.2 classes
1486 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1487 }
1488 calculated_attribute_length +=
1489 code_length +
1490 sizeof(exception_table_length) +
1491 sizeof(code_attributes_count) +
1492 exception_table_length *
1493 ( sizeof(u2) + // start_pc
1494 sizeof(u2) + // end_pc
1495 sizeof(u2) + // handler_pc
1496 sizeof(u2) ); // catch_type_index
1497
1498 while (code_attributes_count--) {
1499 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1500 u2 code_attribute_name_index = cfs->get_u2_fast();
1501 u4 code_attribute_length = cfs->get_u4_fast();
1502 calculated_attribute_length += code_attribute_length +
1503 sizeof(code_attribute_name_index) +
1504 sizeof(code_attribute_length);
1505 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1506 cp->tag_at(code_attribute_name_index).is_utf8(),
1507 "Invalid code attribute name index %u in class file %s",
1508 code_attribute_name_index,
1509 CHECK_(nullHandle));
1510 if (LoadLineNumberTables &&
1511 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1512 // Parse and compress line number table
1513 parse_linenumber_table(code_attribute_length, code_length,
1514 &linenumber_table, CHECK_(nullHandle));
1515
1516 } else if (LoadLocalVariableTables &&
1517 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1518 // Parse local variable table
1519 if (!lvt_allocated) {
1520 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1521 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1522 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1523 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1524 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1525 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1526 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1527 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1528 lvt_allocated = true;
1529 }
1530 if (lvt_cnt == max_lvt_cnt) {
1531 max_lvt_cnt <<= 1;
1532 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1533 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1534 }
1535 localvariable_table_start[lvt_cnt] =
1536 parse_localvariable_table(code_length,
1537 max_locals,
1538 code_attribute_length,
1539 cp,
1540 &localvariable_table_length[lvt_cnt],
1541 false, // is not LVTT
1542 CHECK_(nullHandle));
1543 total_lvt_length += localvariable_table_length[lvt_cnt];
1544 lvt_cnt++;
1545 } else if (LoadLocalVariableTypeTables &&
1546 _major_version >= JAVA_1_5_VERSION &&
1547 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1548 if (!lvt_allocated) {
1549 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1550 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1551 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1552 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1553 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1554 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1555 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1556 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1557 lvt_allocated = true;
1558 }
1559 // Parse local variable type table
1560 if (lvtt_cnt == max_lvtt_cnt) {
1561 max_lvtt_cnt <<= 1;
1562 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1563 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1564 }
1565 localvariable_type_table_start[lvtt_cnt] =
1566 parse_localvariable_table(code_length,
1567 max_locals,
1568 code_attribute_length,
1569 cp,
1570 &localvariable_type_table_length[lvtt_cnt],
1571 true, // is LVTT
1572 CHECK_(nullHandle));
1573 lvtt_cnt++;
1574 } else if (UseSplitVerifier &&
1575 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1576 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1577 // Stack map is only needed by the new verifier in JDK1.5.
1578 if (parsed_stackmap_attribute) {
1579 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1580 }
1581 typeArrayOop sm =
1582 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1583 stackmap_data = typeArrayHandle(THREAD, sm);
1584 parsed_stackmap_attribute = true;
1585 } else {
1586 // Skip unknown attributes
1587 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1588 }
1589 }
1590 // check method attribute length
1591 if (_need_verify) {
1592 guarantee_property(method_attribute_length == calculated_attribute_length,
1593 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1594 }
1595 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1596 // Parse Exceptions attribute
1597 if (parsed_checked_exceptions_attribute) {
1598 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1599 }
1600 parsed_checked_exceptions_attribute = true;
1601 checked_exceptions_start =
1602 parse_checked_exceptions(&checked_exceptions_length,
1603 method_attribute_length,
1604 cp, CHECK_(nullHandle));
1605 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1606 if (method_attribute_length != 0) {
1607 classfile_parse_error(
1608 "Invalid Synthetic method attribute length %u in class file %s",
1609 method_attribute_length, CHECK_(nullHandle));
1610 }
1611 // Should we check that there hasn't already been a synthetic attribute?
1612 access_flags.set_is_synthetic();
1613 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1614 if (method_attribute_length != 0) {
1615 classfile_parse_error(
1616 "Invalid Deprecated method attribute length %u in class file %s",
1617 method_attribute_length, CHECK_(nullHandle));
1618 }
1619 } else if (_major_version >= JAVA_1_5_VERSION) {
1620 if (method_attribute_name == vmSymbols::tag_signature()) {
1621 if (method_attribute_length != 2) {
1622 classfile_parse_error(
1623 "Invalid Signature attribute length %u in class file %s",
1624 method_attribute_length, CHECK_(nullHandle));
1625 }
1626 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1627 generic_signature_index = cfs->get_u2_fast();
1628 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1629 runtime_visible_annotations_length = method_attribute_length;
1630 runtime_visible_annotations = cfs->get_u1_buffer();
1631 assert(runtime_visible_annotations != NULL, "null visible annotations");
1632 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1633 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1634 runtime_invisible_annotations_length = method_attribute_length;
1635 runtime_invisible_annotations = cfs->get_u1_buffer();
1636 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1637 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1638 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1639 runtime_visible_parameter_annotations_length = method_attribute_length;
1640 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1641 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1642 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1643 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1644 runtime_invisible_parameter_annotations_length = method_attribute_length;
1645 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1646 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1647 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1648 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1649 annotation_default_length = method_attribute_length;
1650 annotation_default = cfs->get_u1_buffer();
1651 assert(annotation_default != NULL, "null annotation default");
1652 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1653 } else {
1654 // Skip unknown attributes
1655 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1656 }
1657 } else {
1658 // Skip unknown attributes
1659 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1660 }
1661 }
1662
1663 if (linenumber_table != NULL) {
1664 linenumber_table->write_terminator();
1665 linenumber_table_length = linenumber_table->position();
1666 }
1667
1668 // Make sure there's at least one Code attribute in non-native/non-abstract method
1669 if (_need_verify) {
1670 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1671 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1672 }
1673
1674 // All sizing information for a methodOop is finally available, now create it
1675 methodOop m_oop = oopFactory::new_method(
1676 code_length, access_flags, linenumber_table_length,
1677 total_lvt_length, checked_exceptions_length, CHECK_(nullHandle));
1678 methodHandle m (THREAD, m_oop);
1679
1680 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1681
1682 // Fill in information from fixed part (access_flags already set)
1683 m->set_constants(cp());
1684 m->set_name_index(name_index);
1685 m->set_signature_index(signature_index);
1686 m->set_generic_signature_index(generic_signature_index);
1687 #ifdef CC_INTERP
1688 // hmm is there a gc issue here??
1689 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1690 m->set_result_index(rtf.type());
1691 #endif
1692
1693 if (args_size >= 0) {
1694 m->set_size_of_parameters(args_size);
1695 } else {
1696 m->compute_size_of_parameters(THREAD);
1697 }
1698 #ifdef ASSERT
1699 if (args_size >= 0) {
1700 m->compute_size_of_parameters(THREAD);
1701 assert(args_size == m->size_of_parameters(), "");
1702 }
1703 #endif
1704
1705 // Fill in code attribute information
1706 m->set_max_stack(max_stack);
1707 m->set_max_locals(max_locals);
1708 m->constMethod()->set_stackmap_data(stackmap_data());
1709
1710 /**
1711 * The exception_table field is the flag used to indicate
1712 * that the methodOop and it's associated constMethodOop are partially
1713 * initialized and thus are exempt from pre/post GC verification. Once
1714 * the field is set, the oops are considered fully initialized so make
1715 * sure that the oops can pass verification when this field is set.
1716 */
1717 m->set_exception_table(exception_handlers());
1718
1719 // Copy byte codes
1720 if (code_length > 0) {
1721 memcpy(m->code_base(), code_start, code_length);
1722 }
1723
1724 // Copy line number table
1725 if (linenumber_table != NULL) {
1726 memcpy(m->compressed_linenumber_table(),
1727 linenumber_table->buffer(), linenumber_table_length);
1728 }
1729
1730 // Copy checked exceptions
1731 if (checked_exceptions_length > 0) {
1732 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1733 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1734 }
1735
1736 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1737 *
1738 * Rules for LVT's and LVTT's are:
1739 * - There can be any number of LVT's and LVTT's.
1740 * - If there are n LVT's, it is the same as if there was just
1741 * one LVT containing all the entries from the n LVT's.
1742 * - There may be no more than one LVT entry per local variable.
1743 * Two LVT entries are 'equal' if these fields are the same:
1744 * start_pc, length, name, slot
1745 * - There may be no more than one LVTT entry per each LVT entry.
1746 * Each LVTT entry has to match some LVT entry.
1747 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1748 */
1749 if (total_lvt_length > 0) {
1750 int tbl_no, idx;
1751
1752 promoted_flags->set_has_localvariable_table();
1753
1754 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1755 initialize_hashtable(lvt_Hash);
1756
1757 // To fill LocalVariableTable in
1758 Classfile_LVT_Element* cf_lvt;
1759 LocalVariableTableElement* lvt = m->localvariable_table_start();
1760
1761 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1762 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1763 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1764 copy_lvt_element(&cf_lvt[idx], lvt);
1765 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1766 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1767 && _need_verify
1768 && _major_version >= JAVA_1_5_VERSION ) {
1769 clear_hashtable(lvt_Hash);
1770 classfile_parse_error("Duplicated LocalVariableTable attribute "
1771 "entry for '%s' in class file %s",
1772 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1773 CHECK_(nullHandle));
1774 }
1775 }
1776 }
1777
1778 // To merge LocalVariableTable and LocalVariableTypeTable
1779 Classfile_LVT_Element* cf_lvtt;
1780 LocalVariableTableElement lvtt_elem;
1781
1782 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1783 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1784 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1785 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1786 int index = hash(&lvtt_elem);
1787 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1788 if (entry == NULL) {
1789 if (_need_verify) {
1790 clear_hashtable(lvt_Hash);
1791 classfile_parse_error("LVTT entry for '%s' in class file %s "
1792 "does not match any LVT entry",
1793 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1794 CHECK_(nullHandle));
1795 }
1796 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1797 clear_hashtable(lvt_Hash);
1798 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1799 "entry for '%s' in class file %s",
1800 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1801 CHECK_(nullHandle));
1802 } else {
1803 // to add generic signatures into LocalVariableTable
1804 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1805 }
1806 }
1807 }
1808 clear_hashtable(lvt_Hash);
1809 }
1810
1811 *method_annotations = assemble_annotations(runtime_visible_annotations,
1812 runtime_visible_annotations_length,
1813 runtime_invisible_annotations,
1814 runtime_invisible_annotations_length,
1815 CHECK_(nullHandle));
1816 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1817 runtime_visible_parameter_annotations_length,
1818 runtime_invisible_parameter_annotations,
1819 runtime_invisible_parameter_annotations_length,
1820 CHECK_(nullHandle));
1821 *method_default_annotations = assemble_annotations(annotation_default,
1822 annotation_default_length,
1823 NULL,
1824 0,
1825 CHECK_(nullHandle));
1826
1827 if (name() == vmSymbols::finalize_method_name() &&
1828 signature() == vmSymbols::void_method_signature()) {
1829 if (m->is_empty_method()) {
1830 _has_empty_finalizer = true;
1831 } else {
1832 _has_finalizer = true;
1833 }
1834 }
1835 if (name() == vmSymbols::object_initializer_name() &&
1836 signature() == vmSymbols::void_method_signature() &&
1837 m->is_vanilla_constructor()) {
1838 _has_vanilla_constructor = true;
1839 }
1840
1841 return m;
1842 }
1843
1844
1845 // The promoted_flags parameter is used to pass relevant access_flags
1846 // from the methods back up to the containing klass. These flag values
1847 // are added to klass's access_flags.
1848
1849 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1850 AccessFlags* promoted_flags,
1851 bool* has_final_method,
1852 objArrayOop* methods_annotations_oop,
1853 objArrayOop* methods_parameter_annotations_oop,
1854 objArrayOop* methods_default_annotations_oop,
1855 TRAPS) {
1856 ClassFileStream* cfs = stream();
1857 objArrayHandle nullHandle;
1858 typeArrayHandle method_annotations;
1859 typeArrayHandle method_parameter_annotations;
1860 typeArrayHandle method_default_annotations;
1861 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1862 u2 length = cfs->get_u2_fast();
1863 if (length == 0) {
1864 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1865 } else {
1866 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1867 objArrayHandle methods(THREAD, m);
1868 HandleMark hm(THREAD);
1869 objArrayHandle methods_annotations;
1870 objArrayHandle methods_parameter_annotations;
1871 objArrayHandle methods_default_annotations;
1872 for (int index = 0; index < length; index++) {
1873 methodHandle method = parse_method(cp, is_interface,
1874 promoted_flags,
1875 &method_annotations,
1876 &method_parameter_annotations,
1877 &method_default_annotations,
1878 CHECK_(nullHandle));
1879 if (method->is_final()) {
1880 *has_final_method = true;
1881 }
1882 methods->obj_at_put(index, method());
1883 if (method_annotations.not_null()) {
1884 if (methods_annotations.is_null()) {
1885 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1886 methods_annotations = objArrayHandle(THREAD, md);
1887 }
1888 methods_annotations->obj_at_put(index, method_annotations());
1889 }
1890 if (method_parameter_annotations.not_null()) {
1891 if (methods_parameter_annotations.is_null()) {
1892 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1893 methods_parameter_annotations = objArrayHandle(THREAD, md);
1894 }
1895 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1896 }
1897 if (method_default_annotations.not_null()) {
1898 if (methods_default_annotations.is_null()) {
1899 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1900 methods_default_annotations = objArrayHandle(THREAD, md);
1901 }
1902 methods_default_annotations->obj_at_put(index, method_default_annotations());
1903 }
1904 }
1905 if (_need_verify && length > 1) {
1906 // Check duplicated methods
1907 ResourceMark rm(THREAD);
1908 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1909 THREAD, NameSigHash*, HASH_ROW_SIZE);
1910 initialize_hashtable(names_and_sigs);
1911 bool dup = false;
1912 {
1913 debug_only(No_Safepoint_Verifier nsv;)
1914 for (int i = 0; i < length; i++) {
1915 methodOop m = (methodOop)methods->obj_at(i);
1916 // If no duplicates, add name/signature in hashtable names_and_sigs.
1917 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1918 dup = true;
1919 break;
1920 }
1921 }
1922 }
1923 if (dup) {
1924 classfile_parse_error("Duplicate method name&signature in class file %s",
1925 CHECK_(nullHandle));
1926 }
1927 }
1928
1929 *methods_annotations_oop = methods_annotations();
1930 *methods_parameter_annotations_oop = methods_parameter_annotations();
1931 *methods_default_annotations_oop = methods_default_annotations();
1932
1933 return methods;
1934 }
1935 }
1936
1937
1938 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1939 objArrayHandle methods_annotations,
1940 objArrayHandle methods_parameter_annotations,
1941 objArrayHandle methods_default_annotations,
1942 TRAPS) {
1943 typeArrayHandle nullHandle;
1944 int length = methods()->length();
1945 // If JVMTI original method ordering is enabled we have to
1946 // remember the original class file ordering.
1947 // We temporarily use the vtable_index field in the methodOop to store the
1948 // class file index, so we can read in after calling qsort.
1949 if (JvmtiExport::can_maintain_original_method_order()) {
1950 for (int index = 0; index < length; index++) {
1951 methodOop m = methodOop(methods->obj_at(index));
1952 assert(!m->valid_vtable_index(), "vtable index should not be set");
1953 m->set_vtable_index(index);
1954 }
1955 }
1956 // Sort method array by ascending method name (for faster lookups & vtable construction)
1957 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1958 methodOopDesc::sort_methods(methods(),
1959 methods_annotations(),
1960 methods_parameter_annotations(),
1961 methods_default_annotations());
1962
1963 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1964 if (JvmtiExport::can_maintain_original_method_order()) {
1965 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1966 typeArrayHandle method_ordering(THREAD, new_ordering);
1967 for (int index = 0; index < length; index++) {
1968 methodOop m = methodOop(methods->obj_at(index));
1969 int old_index = m->vtable_index();
1970 assert(old_index >= 0 && old_index < length, "invalid method index");
1971 method_ordering->int_at_put(index, old_index);
1972 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1973 }
1974 return method_ordering;
1975 } else {
1976 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1977 }
1978 }
1979
1980
1981 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1982 ClassFileStream* cfs = stream();
1983 cfs->guarantee_more(2, CHECK); // sourcefile_index
1984 u2 sourcefile_index = cfs->get_u2_fast();
1985 check_property(
1986 valid_cp_range(sourcefile_index, cp->length()) &&
1987 cp->tag_at(sourcefile_index).is_utf8(),
1988 "Invalid SourceFile attribute at constant pool index %u in class file %s",
1989 sourcefile_index, CHECK);
1990 k->set_source_file_name(cp->symbol_at(sourcefile_index));
1991 }
1992
1993
1994
1995 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
1996 instanceKlassHandle k,
1997 int length, TRAPS) {
1998 ClassFileStream* cfs = stream();
1999 u1* sde_buffer = cfs->get_u1_buffer();
2000 assert(sde_buffer != NULL, "null sde buffer");
2001
2002 // Don't bother storing it if there is no way to retrieve it
2003 if (JvmtiExport::can_get_source_debug_extension()) {
2004 // Optimistically assume that only 1 byte UTF format is used
2005 // (common case)
2006 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2007 length, CHECK);
2008 k->set_source_debug_extension(sde_symbol);
2009 }
2010 // Got utf8 string, set stream position forward
2011 cfs->skip_u1(length, CHECK);
2012 }
2013
2014
2015 // Inner classes can be static, private or protected (classic VM does this)
2016 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2017
2018 // Return number of classes in the inner classes attribute table
2019 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2020 ClassFileStream* cfs = stream();
2021 cfs->guarantee_more(2, CHECK_0); // length
2022 u2 length = cfs->get_u2_fast();
2023
2024 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2025 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2026 typeArrayHandle inner_classes(THREAD, ic);
2027 int index = 0;
2028 int cp_size = cp->length();
2029 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2030 for (int n = 0; n < length; n++) {
2031 // Inner class index
2032 u2 inner_class_info_index = cfs->get_u2_fast();
2033 check_property(
2034 inner_class_info_index == 0 ||
2035 (valid_cp_range(inner_class_info_index, cp_size) &&
2036 is_klass_reference(cp, inner_class_info_index)),
2037 "inner_class_info_index %u has bad constant type in class file %s",
2038 inner_class_info_index, CHECK_0);
2039 // Outer class index
2040 u2 outer_class_info_index = cfs->get_u2_fast();
2041 check_property(
2042 outer_class_info_index == 0 ||
2043 (valid_cp_range(outer_class_info_index, cp_size) &&
2044 is_klass_reference(cp, outer_class_info_index)),
2045 "outer_class_info_index %u has bad constant type in class file %s",
2046 outer_class_info_index, CHECK_0);
2047 // Inner class name
2048 u2 inner_name_index = cfs->get_u2_fast();
2049 check_property(
2050 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2051 cp->tag_at(inner_name_index).is_utf8()),
2052 "inner_name_index %u has bad constant type in class file %s",
2053 inner_name_index, CHECK_0);
2054 if (_need_verify) {
2055 guarantee_property(inner_class_info_index != outer_class_info_index,
2056 "Class is both outer and inner class in class file %s", CHECK_0);
2057 }
2058 // Access flags
2059 AccessFlags inner_access_flags;
2060 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2061 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2062 // Set abstract bit for old class files for backward compatibility
2063 flags |= JVM_ACC_ABSTRACT;
2064 }
2065 verify_legal_class_modifiers(flags, CHECK_0);
2066 inner_access_flags.set_flags(flags);
2067
2068 inner_classes->short_at_put(index++, inner_class_info_index);
2069 inner_classes->short_at_put(index++, outer_class_info_index);
2070 inner_classes->short_at_put(index++, inner_name_index);
2071 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2072 }
2073
2074 // 4347400: make sure there's no duplicate entry in the classes array
2075 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2076 for(int i = 0; i < inner_classes->length(); i += 4) {
2077 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2078 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2079 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2080 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2081 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2082 "Duplicate entry in InnerClasses in class file %s",
2083 CHECK_0);
2084 }
2085 }
2086 }
2087
2088 // Update instanceKlass with inner class info.
2089 k->set_inner_classes(inner_classes());
2090 return length;
2091 }
2092
2093 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2094 k->set_is_synthetic();
2095 }
2096
2097 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2098 ClassFileStream* cfs = stream();
2099 u2 signature_index = cfs->get_u2(CHECK);
2100 check_property(
2101 valid_cp_range(signature_index, cp->length()) &&
2102 cp->tag_at(signature_index).is_utf8(),
2103 "Invalid constant pool index %u in Signature attribute in class file %s",
2104 signature_index, CHECK);
2105 k->set_generic_signature(cp->symbol_at(signature_index));
2106 }
2107
2108 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2109 ClassFileStream* cfs = stream();
2110 // Set inner classes attribute to default sentinel
2111 k->set_inner_classes(Universe::the_empty_short_array());
2112 cfs->guarantee_more(2, CHECK); // attributes_count
2113 u2 attributes_count = cfs->get_u2_fast();
2114 bool parsed_sourcefile_attribute = false;
2115 bool parsed_innerclasses_attribute = false;
2116 bool parsed_enclosingmethod_attribute = false;
2117 u1* runtime_visible_annotations = NULL;
2118 int runtime_visible_annotations_length = 0;
2119 u1* runtime_invisible_annotations = NULL;
2120 int runtime_invisible_annotations_length = 0;
2121 // Iterate over attributes
2122 while (attributes_count--) {
2123 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2124 u2 attribute_name_index = cfs->get_u2_fast();
2125 u4 attribute_length = cfs->get_u4_fast();
2126 check_property(
2127 valid_cp_range(attribute_name_index, cp->length()) &&
2128 cp->tag_at(attribute_name_index).is_utf8(),
2129 "Attribute name has bad constant pool index %u in class file %s",
2130 attribute_name_index, CHECK);
2131 symbolOop tag = cp->symbol_at(attribute_name_index);
2132 if (tag == vmSymbols::tag_source_file()) {
2133 // Check for SourceFile tag
2134 if (_need_verify) {
2135 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2136 }
2137 if (parsed_sourcefile_attribute) {
2138 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2139 } else {
2140 parsed_sourcefile_attribute = true;
2141 }
2142 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2143 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2144 // Check for SourceDebugExtension tag
2145 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2146 } else if (tag == vmSymbols::tag_inner_classes()) {
2147 // Check for InnerClasses tag
2148 if (parsed_innerclasses_attribute) {
2149 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2150 } else {
2151 parsed_innerclasses_attribute = true;
2152 }
2153 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2154 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2155 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2156 "Wrong InnerClasses attribute length in class file %s", CHECK);
2157 }
2158 } else if (tag == vmSymbols::tag_synthetic()) {
2159 // Check for Synthetic tag
2160 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2161 if (attribute_length != 0) {
2162 classfile_parse_error(
2163 "Invalid Synthetic classfile attribute length %u in class file %s",
2164 attribute_length, CHECK);
2165 }
2166 parse_classfile_synthetic_attribute(cp, k, CHECK);
2167 } else if (tag == vmSymbols::tag_deprecated()) {
2168 // Check for Deprecatd tag - 4276120
2169 if (attribute_length != 0) {
2170 classfile_parse_error(
2171 "Invalid Deprecated classfile attribute length %u in class file %s",
2172 attribute_length, CHECK);
2173 }
2174 } else if (_major_version >= JAVA_1_5_VERSION) {
2175 if (tag == vmSymbols::tag_signature()) {
2176 if (attribute_length != 2) {
2177 classfile_parse_error(
2178 "Wrong Signature attribute length %u in class file %s",
2179 attribute_length, CHECK);
2180 }
2181 parse_classfile_signature_attribute(cp, k, CHECK);
2182 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2183 runtime_visible_annotations_length = attribute_length;
2184 runtime_visible_annotations = cfs->get_u1_buffer();
2185 assert(runtime_visible_annotations != NULL, "null visible annotations");
2186 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2187 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2188 runtime_invisible_annotations_length = attribute_length;
2189 runtime_invisible_annotations = cfs->get_u1_buffer();
2190 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2191 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2192 } else if (tag == vmSymbols::tag_enclosing_method()) {
2193 if (parsed_enclosingmethod_attribute) {
2194 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2195 } else {
2196 parsed_enclosingmethod_attribute = true;
2197 }
2198 cfs->guarantee_more(4, CHECK); // class_index, method_index
2199 u2 class_index = cfs->get_u2_fast();
2200 u2 method_index = cfs->get_u2_fast();
2201 if (class_index == 0) {
2202 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2203 }
2204 // Validate the constant pool indices and types
2205 if (!cp->is_within_bounds(class_index) ||
2206 !is_klass_reference(cp, class_index)) {
2207 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2208 }
2209 if (method_index != 0 &&
2210 (!cp->is_within_bounds(method_index) ||
2211 !cp->tag_at(method_index).is_name_and_type())) {
2212 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2213 }
2214 k->set_enclosing_method_indices(class_index, method_index);
2215 } else {
2216 // Unknown attribute
2217 cfs->skip_u1(attribute_length, CHECK);
2218 }
2219 } else {
2220 // Unknown attribute
2221 cfs->skip_u1(attribute_length, CHECK);
2222 }
2223 }
2224 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2225 runtime_visible_annotations_length,
2226 runtime_invisible_annotations,
2227 runtime_invisible_annotations_length,
2228 CHECK);
2229 k->set_class_annotations(annotations());
2230 }
2231
2232
2233 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2234 int runtime_visible_annotations_length,
2235 u1* runtime_invisible_annotations,
2236 int runtime_invisible_annotations_length, TRAPS) {
2237 typeArrayHandle annotations;
2238 if (runtime_visible_annotations != NULL ||
2239 runtime_invisible_annotations != NULL) {
2240 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2241 runtime_invisible_annotations_length, CHECK_(annotations));
2242 annotations = typeArrayHandle(THREAD, anno);
2243 if (runtime_visible_annotations != NULL) {
2244 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2245 }
2246 if (runtime_invisible_annotations != NULL) {
2247 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2248 }
2249 }
2250 return annotations;
2251 }
2252
2253
2254 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2255 KlassHandle h_k (THREAD, fd->field_holder());
2256 assert(h_k.not_null() && fd->is_static(), "just checking");
2257 if (fd->has_initial_value()) {
2258 BasicType t = fd->field_type();
2259 switch (t) {
2260 case T_BYTE:
2261 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2262 break;
2263 case T_BOOLEAN:
2264 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2265 break;
2266 case T_CHAR:
2267 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2268 break;
2269 case T_SHORT:
2270 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2271 break;
2272 case T_INT:
2273 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2274 break;
2275 case T_FLOAT:
2276 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2277 break;
2278 case T_DOUBLE:
2279 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2280 break;
2281 case T_LONG:
2282 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2283 break;
2284 case T_OBJECT:
2285 {
2286 #ifdef ASSERT
2287 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2288 assert(fd->signature() == sym, "just checking");
2289 #endif
2290 oop string = fd->string_initial_value(CHECK);
2291 h_k()->obj_field_put(fd->offset(), string);
2292 }
2293 break;
2294 default:
2295 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2296 "Illegal ConstantValue attribute in class file");
2297 }
2298 }
2299 }
2300
2301
2302 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2303 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2304 // This code is for compatibility with earlier jdk's that do not
2305 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2306 // the check for the "discovered" field should issue a warning if
2307 // the field is not found. For 1.6 this code should be issue a
2308 // fatal error if the "discovered" field is not found.
2309 //
2310 // Increment fac.nonstatic_oop_count so that the start of the
2311 // next type of non-static oops leaves room for the fake oop.
2312 // Do not increment next_nonstatic_oop_offset so that the
2313 // fake oop is place after the java.lang.ref.Reference oop
2314 // fields.
2315 //
2316 // Check the fields in java.lang.ref.Reference for the "discovered"
2317 // field. If it is not present, artifically create a field for it.
2318 // This allows this VM to run on early JDK where the field is not
2319 // present.
2320
2321 //
2322 // Increment fac.nonstatic_oop_count so that the start of the
2323 // next type of non-static oops leaves room for the fake oop.
2324 // Do not increment next_nonstatic_oop_offset so that the
2325 // fake oop is place after the java.lang.ref.Reference oop
2326 // fields.
2327 //
2328 // Check the fields in java.lang.ref.Reference for the "discovered"
2329 // field. If it is not present, artifically create a field for it.
2330 // This allows this VM to run on early JDK where the field is not
2331 // present.
2332 int reference_sig_index = 0;
2333 int reference_name_index = 0;
2334 int reference_index = 0;
2335 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2336 const int n = (*fields_ptr)()->length();
2337 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2338 int name_index =
2339 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2340 int sig_index =
2341 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2342 symbolOop f_name = cp->symbol_at(name_index);
2343 symbolOop f_sig = cp->symbol_at(sig_index);
2344 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2345 // Save the index for reference signature for later use.
2346 // The fake discovered field does not entries in the
2347 // constant pool so the index for its signature cannot
2348 // be extracted from the constant pool. It will need
2349 // later, however. It's signature is vmSymbols::reference_signature()
2350 // so same an index for that signature.
2351 reference_sig_index = sig_index;
2352 reference_name_index = name_index;
2353 reference_index = i;
2354 }
2355 if (f_name == vmSymbols::reference_discovered_name() &&
2356 f_sig == vmSymbols::reference_signature()) {
2357 // The values below are fake but will force extra
2358 // non-static oop fields and a corresponding non-static
2359 // oop map block to be allocated.
2360 extra = 0;
2361 break;
2362 }
2363 }
2364 if (extra != 0) {
2365 fac_ptr->nonstatic_oop_count += extra;
2366 // Add the additional entry to "fields" so that the klass
2367 // contains the "discoverd" field and the field will be initialized
2368 // in instances of the object.
2369 int fields_with_fix_length = (*fields_ptr)()->length() +
2370 instanceKlass::next_offset;
2371 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2372 fields_with_fix_length, CHECK);
2373 typeArrayHandle fields_with_fix(THREAD, ff);
2374
2375 // Take everything from the original but the length.
2376 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2377 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2378 }
2379
2380 // Add the fake field at the end.
2381 int i = (*fields_ptr)->length();
2382 // There is no name index for the fake "discovered" field nor
2383 // signature but a signature is needed so that the field will
2384 // be properly initialized. Use one found for
2385 // one of the other reference fields. Be sure the index for the
2386 // name is 0. In fieldDescriptor::initialize() the index of the
2387 // name is checked. That check is by passed for the last nonstatic
2388 // oop field in a java.lang.ref.Reference which is assumed to be
2389 // this artificial "discovered" field. An assertion checks that
2390 // the name index is 0.
2391 assert(reference_index != 0, "Missing signature for reference");
2392
2393 int j;
2394 for (j = 0; j < instanceKlass::next_offset; j++) {
2395 fields_with_fix->ushort_at_put(i + j,
2396 (*fields_ptr)->ushort_at(reference_index +j));
2397 }
2398 // Clear the public access flag and set the private access flag.
2399 short flags;
2400 flags =
2401 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2402 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2403 flags = flags & (~JVM_ACC_PUBLIC);
2404 flags = flags | JVM_ACC_PRIVATE;
2405 AccessFlags access_flags;
2406 access_flags.set_flags(flags);
2407 assert(!access_flags.is_public(), "Failed to clear public flag");
2408 assert(access_flags.is_private(), "Failed to set private flag");
2409 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2410 flags);
2411
2412 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2413 == reference_name_index, "The fake reference name is incorrect");
2414 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2415 == reference_sig_index, "The fake reference signature is incorrect");
2416 // The type of the field is stored in the low_offset entry during
2417 // parsing.
2418 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2419 NONSTATIC_OOP, "The fake reference type is incorrect");
2420
2421 // "fields" is allocated in the permanent generation. Disgard
2422 // it and let it be collected.
2423 (*fields_ptr) = fields_with_fix;
2424 }
2425 return;
2426 }
2427
2428
2429 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2430 FieldAllocationCount *fac_ptr, TRAPS) {
2431 // Add fake fields for java.lang.Class instances
2432 //
2433 // This is not particularly nice. We should consider adding a
2434 // private transient object field at the Java level to
2435 // java.lang.Class. Alternatively we could add a subclass of
2436 // instanceKlass which provides an accessor and size computer for
2437 // this field, but that appears to be more code than this hack.
2438 //
2439 // NOTE that we wedge these in at the beginning rather than the
2440 // end of the object because the Class layout changed between JDK
2441 // 1.3 and JDK 1.4 with the new reflection implementation; some
2442 // nonstatic oop fields were added at the Java level. The offsets
2443 // of these fake fields can't change between these two JDK
2444 // versions because when the offsets are computed at bootstrap
2445 // time we don't know yet which version of the JDK we're running in.
2446
2447 // The values below are fake but will force two non-static oop fields and
2448 // a corresponding non-static oop map block to be allocated.
2449 const int extra = java_lang_Class::number_of_fake_oop_fields;
2450 fac_ptr->nonstatic_oop_count += extra;
2451 }
2452
2453
2454 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2455 // Cause the extra fake fields in java.lang.Class to show up before
2456 // the Java fields for layout compatibility between 1.3 and 1.4
2457 // Incrementing next_nonstatic_oop_offset here advances the
2458 // location where the real java fields are placed.
2459 const int extra = java_lang_Class::number_of_fake_oop_fields;
2460 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2461 }
2462
2463
2464 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2465 Handle class_loader,
2466 Handle protection_domain,
2467 GrowableArray<Handle>* cp_patches,
2468 symbolHandle& parsed_name,
2469 TRAPS) {
2470 // So that JVMTI can cache class file in the state before retransformable agents
2471 // have modified it
2472 unsigned char *cached_class_file_bytes = NULL;
2473 jint cached_class_file_length;
2474
2475 ClassFileStream* cfs = stream();
2476 // Timing
2477 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time());
2478
2479 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2480
2481 if (JvmtiExport::should_post_class_file_load_hook()) {
2482 unsigned char* ptr = cfs->buffer();
2483 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2484
2485 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2486 &ptr, &end_ptr,
2487 &cached_class_file_bytes,
2488 &cached_class_file_length);
2489
2490 if (ptr != cfs->buffer()) {
2491 // JVMTI agent has modified class file data.
2492 // Set new class file stream using JVMTI agent modified
2493 // class file data.
2494 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2495 set_stream(cfs);
2496 }
2497 }
2498
2499 _cp_patches = cp_patches;
2500
2501 instanceKlassHandle nullHandle;
2502
2503 // Figure out whether we can skip format checking (matching classic VM behavior)
2504 _need_verify = Verifier::should_verify_for(class_loader());
2505
2506 // Set the verify flag in stream
2507 cfs->set_verify(_need_verify);
2508
2509 // Save the class file name for easier error message printing.
2510 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2511
2512 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2513 // Magic value
2514 u4 magic = cfs->get_u4_fast();
2515 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2516 "Incompatible magic value %u in class file %s",
2517 magic, CHECK_(nullHandle));
2518
2519 // Version numbers
2520 u2 minor_version = cfs->get_u2_fast();
2521 u2 major_version = cfs->get_u2_fast();
2522
2523 // Check version numbers - we check this even with verifier off
2524 if (!is_supported_version(major_version, minor_version)) {
2525 if (name.is_null()) {
2526 Exceptions::fthrow(
2527 THREAD_AND_LOCATION,
2528 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2529 "Unsupported major.minor version %u.%u",
2530 major_version,
2531 minor_version);
2532 } else {
2533 ResourceMark rm(THREAD);
2534 Exceptions::fthrow(
2535 THREAD_AND_LOCATION,
2536 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2537 "%s : Unsupported major.minor version %u.%u",
2538 name->as_C_string(),
2539 major_version,
2540 minor_version);
2541 }
2542 return nullHandle;
2543 }
2544
2545 _major_version = major_version;
2546 _minor_version = minor_version;
2547
2548
2549 // Check if verification needs to be relaxed for this class file
2550 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2551 _relax_verify = Verifier::relax_verify_for(class_loader());
2552
2553 // Constant pool
2554 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2555 int cp_size = cp->length();
2556
2557 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2558
2559 // Access flags
2560 AccessFlags access_flags;
2561 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2562
2563 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2564 // Set abstract bit for old class files for backward compatibility
2565 flags |= JVM_ACC_ABSTRACT;
2566 }
2567 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2568 access_flags.set_flags(flags);
2569
2570 // This class and superclass
2571 instanceKlassHandle super_klass;
2572 u2 this_class_index = cfs->get_u2_fast();
2573 check_property(
2574 valid_cp_range(this_class_index, cp_size) &&
2575 cp->tag_at(this_class_index).is_unresolved_klass(),
2576 "Invalid this class index %u in constant pool in class file %s",
2577 this_class_index, CHECK_(nullHandle));
2578
2579 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2580 assert(class_name.not_null(), "class_name can't be null");
2581
2582 // It's important to set parsed_name *before* resolving the super class.
2583 // (it's used for cleanup by the caller if parsing fails)
2584 parsed_name = class_name;
2585
2586 // Update _class_name which could be null previously to be class_name
2587 _class_name = class_name;
2588
2589 // Don't need to check whether this class name is legal or not.
2590 // It has been checked when constant pool is parsed.
2591 // However, make sure it is not an array type.
2592 if (_need_verify) {
2593 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2594 "Bad class name in class file %s",
2595 CHECK_(nullHandle));
2596 }
2597
2598 klassOop preserve_this_klass; // for storing result across HandleMark
2599
2600 // release all handles when parsing is done
2601 { HandleMark hm(THREAD);
2602
2603 // Checks if name in class file matches requested name
2604 if (name.not_null() && class_name() != name()) {
2605 ResourceMark rm(THREAD);
2606 Exceptions::fthrow(
2607 THREAD_AND_LOCATION,
2608 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2609 "%s (wrong name: %s)",
2610 name->as_C_string(),
2611 class_name->as_C_string()
2612 );
2613 return nullHandle;
2614 }
2615
2616 if (TraceClassLoadingPreorder) {
2617 tty->print("[Loading %s", name()->as_klass_external_name());
2618 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2619 tty->print_cr("]");
2620 }
2621
2622 u2 super_class_index = cfs->get_u2_fast();
2623 if (super_class_index == 0) {
2624 check_property(class_name() == vmSymbols::java_lang_Object(),
2625 "Invalid superclass index %u in class file %s",
2626 super_class_index,
2627 CHECK_(nullHandle));
2628 } else {
2629 check_property(valid_cp_range(super_class_index, cp_size) &&
2630 is_klass_reference(cp, super_class_index),
2631 "Invalid superclass index %u in class file %s",
2632 super_class_index,
2633 CHECK_(nullHandle));
2634 // The class name should be legal because it is checked when parsing constant pool.
2635 // However, make sure it is not an array type.
2636 bool is_array = false;
2637 if (cp->tag_at(super_class_index).is_klass()) {
2638 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2639 if (_need_verify)
2640 is_array = super_klass->oop_is_array();
2641 } else if (_need_verify) {
2642 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2643 }
2644 if (_need_verify) {
2645 guarantee_property(!is_array,
2646 "Bad superclass name in class file %s", CHECK_(nullHandle));
2647 }
2648 }
2649
2650 // Interfaces
2651 u2 itfs_len = cfs->get_u2_fast();
2652 objArrayHandle local_interfaces;
2653 if (itfs_len == 0) {
2654 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2655 } else {
2656 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle));
2657 }
2658
2659 // Fields (offsets are filled in later)
2660 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2661 objArrayHandle fields_annotations;
2662 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2663 // Methods
2664 bool has_final_method = false;
2665 AccessFlags promoted_flags;
2666 promoted_flags.set_flags(0);
2667 // These need to be oop pointers because they are allocated lazily
2668 // inside parse_methods inside a nested HandleMark
2669 objArrayOop methods_annotations_oop = NULL;
2670 objArrayOop methods_parameter_annotations_oop = NULL;
2671 objArrayOop methods_default_annotations_oop = NULL;
2672 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2673 &promoted_flags,
2674 &has_final_method,
2675 &methods_annotations_oop,
2676 &methods_parameter_annotations_oop,
2677 &methods_default_annotations_oop,
2678 CHECK_(nullHandle));
2679
2680 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2681 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2682 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2683
2684 // We check super class after class file is parsed and format is checked
2685 if (super_class_index > 0 && super_klass.is_null()) {
2686 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2687 if (access_flags.is_interface()) {
2688 // Before attempting to resolve the superclass, check for class format
2689 // errors not checked yet.
2690 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2691 "Interfaces must have java.lang.Object as superclass in class file %s",
2692 CHECK_(nullHandle));
2693 }
2694 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2695 sk,
2696 class_loader,
2697 protection_domain,
2698 true,
2699 CHECK_(nullHandle));
2700 KlassHandle kh (THREAD, k);
2701 super_klass = instanceKlassHandle(THREAD, kh());
2702 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2703 }
2704 if (super_klass.not_null()) {
2705 if (super_klass->is_interface()) {
2706 ResourceMark rm(THREAD);
2707 Exceptions::fthrow(
2708 THREAD_AND_LOCATION,
2709 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2710 "class %s has interface %s as super class",
2711 class_name->as_klass_external_name(),
2712 super_klass->external_name()
2713 );
2714 return nullHandle;
2715 }
2716 // Make sure super class is not final
2717 if (super_klass->is_final()) {
2718 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2719 }
2720 }
2721
2722 // Compute the transitive list of all unique interfaces implemented by this class
2723 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2724
2725 // sort methods
2726 typeArrayHandle method_ordering = sort_methods(methods,
2727 methods_annotations,
2728 methods_parameter_annotations,
2729 methods_default_annotations,
2730 CHECK_(nullHandle));
2731
2732 // promote flags from parse_methods() to the klass' flags
2733 access_flags.add_promoted_flags(promoted_flags.as_int());
2734
2735 // Size of Java vtable (in words)
2736 int vtable_size = 0;
2737 int itable_size = 0;
2738 int num_miranda_methods = 0;
2739
2740 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2741 num_miranda_methods,
2742 super_klass(),
2743 methods(),
2744 access_flags,
2745 class_loader(),
2746 class_name(),
2747 local_interfaces());
2748
2749 // Size of Java itable (in words)
2750 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2751
2752 // Field size and offset computation
2753 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2754 #ifndef PRODUCT
2755 int orig_nonstatic_field_size = 0;
2756 #endif
2757 int static_field_size = 0;
2758 int next_static_oop_offset;
2759 int next_static_double_offset;
2760 int next_static_word_offset;
2761 int next_static_short_offset;
2762 int next_static_byte_offset;
2763 int next_static_type_offset;
2764 int next_nonstatic_oop_offset;
2765 int next_nonstatic_double_offset;
2766 int next_nonstatic_word_offset;
2767 int next_nonstatic_short_offset;
2768 int next_nonstatic_byte_offset;
2769 int next_nonstatic_type_offset;
2770 int first_nonstatic_oop_offset;
2771 int first_nonstatic_field_offset;
2772 int next_nonstatic_field_offset;
2773
2774 // Calculate the starting byte offsets
2775 next_static_oop_offset = (instanceKlass::header_size() +
2776 align_object_offset(vtable_size) +
2777 align_object_offset(itable_size)) * wordSize;
2778 next_static_double_offset = next_static_oop_offset +
2779 (fac.static_oop_count * heapOopSize);
2780 if ( fac.static_double_count &&
2781 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2782 Universe::field_type_should_be_aligned(T_LONG)) ) {
2783 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2784 }
2785
2786 next_static_word_offset = next_static_double_offset +
2787 (fac.static_double_count * BytesPerLong);
2788 next_static_short_offset = next_static_word_offset +
2789 (fac.static_word_count * BytesPerInt);
2790 next_static_byte_offset = next_static_short_offset +
2791 (fac.static_short_count * BytesPerShort);
2792 next_static_type_offset = align_size_up((next_static_byte_offset +
2793 fac.static_byte_count ), wordSize );
2794 static_field_size = (next_static_type_offset -
2795 next_static_oop_offset) / wordSize;
2796 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
2797 nonstatic_field_size * heapOopSize;
2798 next_nonstatic_field_offset = first_nonstatic_field_offset;
2799
2800 // Add fake fields for java.lang.Class instances (also see below)
2801 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2802 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2803 }
2804
2805 // Add a fake "discovered" field if it is not present
2806 // for compatibility with earlier jdk's.
2807 if (class_name() == vmSymbols::java_lang_ref_Reference()
2808 && class_loader.is_null()) {
2809 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2810 }
2811 // end of "discovered" field compactibility fix
2812
2813 int nonstatic_double_count = fac.nonstatic_double_count;
2814 int nonstatic_word_count = fac.nonstatic_word_count;
2815 int nonstatic_short_count = fac.nonstatic_short_count;
2816 int nonstatic_byte_count = fac.nonstatic_byte_count;
2817 int nonstatic_oop_count = fac.nonstatic_oop_count;
2818
2819 bool super_has_nonstatic_fields =
2820 (super_klass() != NULL && super_klass->has_nonstatic_fields());
2821 bool has_nonstatic_fields = super_has_nonstatic_fields ||
2822 ((nonstatic_double_count + nonstatic_word_count +
2823 nonstatic_short_count + nonstatic_byte_count +
2824 nonstatic_oop_count) != 0);
2825
2826
2827 // Prepare list of oops for oop maps generation.
2828 u2* nonstatic_oop_offsets;
2829 u2* nonstatic_oop_length;
2830 int nonstatic_oop_map_count = 0;
2831
2832 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2833 THREAD, u2, nonstatic_oop_count+1);
2834 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2835 THREAD, u2, nonstatic_oop_count+1);
2836
2837 // Add fake fields for java.lang.Class instances (also see above).
2838 // FieldsAllocationStyle and CompactFields values will be reset to default.
2839 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2840 java_lang_Class_fix_post(&next_nonstatic_field_offset);
2841 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset;
2842 int fake_oop_count = (( next_nonstatic_field_offset -
2843 first_nonstatic_field_offset ) / heapOopSize);
2844 nonstatic_oop_length [0] = (u2)fake_oop_count;
2845 nonstatic_oop_map_count = 1;
2846 nonstatic_oop_count -= fake_oop_count;
2847 first_nonstatic_oop_offset = first_nonstatic_field_offset;
2848 } else {
2849 first_nonstatic_oop_offset = 0; // will be set for first oop field
2850 }
2851
2852 #ifndef PRODUCT
2853 if( PrintCompactFieldsSavings ) {
2854 next_nonstatic_double_offset = next_nonstatic_field_offset +
2855 (nonstatic_oop_count * heapOopSize);
2856 if ( nonstatic_double_count > 0 ) {
2857 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2858 }
2859 next_nonstatic_word_offset = next_nonstatic_double_offset +
2860 (nonstatic_double_count * BytesPerLong);
2861 next_nonstatic_short_offset = next_nonstatic_word_offset +
2862 (nonstatic_word_count * BytesPerInt);
2863 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2864 (nonstatic_short_count * BytesPerShort);
2865 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
2866 nonstatic_byte_count ), heapOopSize );
2867 orig_nonstatic_field_size = nonstatic_field_size +
2868 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
2869 }
2870 #endif
2871 bool compact_fields = CompactFields;
2872 int allocation_style = FieldsAllocationStyle;
2873 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range?
2874 assert(false, "0 <= FieldsAllocationStyle <= 1");
2875 allocation_style = 1; // Optimistic
2876 }
2877
2878 // The next classes have predefined hard-coded fields offsets
2879 // (see in JavaClasses::compute_hard_coded_offsets()).
2880 // Use default fields allocation order for them.
2881 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2882 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2883 class_name() == vmSymbols::java_lang_Class() ||
2884 class_name() == vmSymbols::java_lang_ClassLoader() ||
2885 class_name() == vmSymbols::java_lang_ref_Reference() ||
2886 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2887 class_name() == vmSymbols::java_lang_StackTraceElement() ||
2888 class_name() == vmSymbols::java_lang_String() ||
2889 class_name() == vmSymbols::java_lang_Throwable() ||
2890 class_name() == vmSymbols::java_lang_Boolean() ||
2891 class_name() == vmSymbols::java_lang_Character() ||
2892 class_name() == vmSymbols::java_lang_Float() ||
2893 class_name() == vmSymbols::java_lang_Double() ||
2894 class_name() == vmSymbols::java_lang_Byte() ||
2895 class_name() == vmSymbols::java_lang_Short() ||
2896 class_name() == vmSymbols::java_lang_Integer() ||
2897 class_name() == vmSymbols::java_lang_Long())) {
2898 allocation_style = 0; // Allocate oops first
2899 compact_fields = false; // Don't compact fields
2900 }
2901
2902 if( allocation_style == 0 ) {
2903 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2904 next_nonstatic_oop_offset = next_nonstatic_field_offset;
2905 next_nonstatic_double_offset = next_nonstatic_oop_offset +
2906 (nonstatic_oop_count * heapOopSize);
2907 } else if( allocation_style == 1 ) {
2908 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
2909 next_nonstatic_double_offset = next_nonstatic_field_offset;
2910 } else {
2911 ShouldNotReachHere();
2912 }
2913
2914 int nonstatic_oop_space_count = 0;
2915 int nonstatic_word_space_count = 0;
2916 int nonstatic_short_space_count = 0;
2917 int nonstatic_byte_space_count = 0;
2918 int nonstatic_oop_space_offset;
2919 int nonstatic_word_space_offset;
2920 int nonstatic_short_space_offset;
2921 int nonstatic_byte_space_offset;
2922
2923 if( nonstatic_double_count > 0 ) {
2924 int offset = next_nonstatic_double_offset;
2925 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
2926 if( compact_fields && offset != next_nonstatic_double_offset ) {
2927 // Allocate available fields into the gap before double field.
2928 int length = next_nonstatic_double_offset - offset;
2929 assert(length == BytesPerInt, "");
2930 nonstatic_word_space_offset = offset;
2931 if( nonstatic_word_count > 0 ) {
2932 nonstatic_word_count -= 1;
2933 nonstatic_word_space_count = 1; // Only one will fit
2934 length -= BytesPerInt;
2935 offset += BytesPerInt;
2936 }
2937 nonstatic_short_space_offset = offset;
2938 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
2939 nonstatic_short_count -= 1;
2940 nonstatic_short_space_count += 1;
2941 length -= BytesPerShort;
2942 offset += BytesPerShort;
2943 }
2944 nonstatic_byte_space_offset = offset;
2945 while( length > 0 && nonstatic_byte_count > 0 ) {
2946 nonstatic_byte_count -= 1;
2947 nonstatic_byte_space_count += 1;
2948 length -= 1;
2949 }
2950 // Allocate oop field in the gap if there are no other fields for that.
2951 nonstatic_oop_space_offset = offset;
2952 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
2953 allocation_style != 0 ) { // when oop fields not first
2954 nonstatic_oop_count -= 1;
2955 nonstatic_oop_space_count = 1; // Only one will fit
2956 length -= heapOopSize;
2957 offset += heapOopSize;
2958 }
2959 }
2960 }
2961
2962 next_nonstatic_word_offset = next_nonstatic_double_offset +
2963 (nonstatic_double_count * BytesPerLong);
2964 next_nonstatic_short_offset = next_nonstatic_word_offset +
2965 (nonstatic_word_count * BytesPerInt);
2966 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2967 (nonstatic_short_count * BytesPerShort);
2968
2969 int notaligned_offset;
2970 if( allocation_style == 0 ) {
2971 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2972 } else { // allocation_style == 1
2973 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2974 if( nonstatic_oop_count > 0 ) {
2975 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
2976 }
2977 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
2978 }
2979 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
2980 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
2981 - first_nonstatic_field_offset)/heapOopSize);
2982
2983 // Iterate over fields again and compute correct offsets.
2984 // The field allocation type was temporarily stored in the offset slot.
2985 // oop fields are located before non-oop fields (static and non-static).
2986 int len = fields->length();
2987 for (int i = 0; i < len; i += instanceKlass::next_offset) {
2988 int real_offset;
2989 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4);
2990 switch (atype) {
2991 case STATIC_OOP:
2992 real_offset = next_static_oop_offset;
2993 next_static_oop_offset += heapOopSize;
2994 break;
2995 case STATIC_BYTE:
2996 real_offset = next_static_byte_offset;
2997 next_static_byte_offset += 1;
2998 break;
2999 case STATIC_SHORT:
3000 real_offset = next_static_short_offset;
3001 next_static_short_offset += BytesPerShort;
3002 break;
3003 case STATIC_WORD:
3004 real_offset = next_static_word_offset;
3005 next_static_word_offset += BytesPerInt;
3006 break;
3007 case STATIC_ALIGNED_DOUBLE:
3008 case STATIC_DOUBLE:
3009 real_offset = next_static_double_offset;
3010 next_static_double_offset += BytesPerLong;
3011 break;
3012 case NONSTATIC_OOP:
3013 if( nonstatic_oop_space_count > 0 ) {
3014 real_offset = nonstatic_oop_space_offset;
3015 nonstatic_oop_space_offset += heapOopSize;
3016 nonstatic_oop_space_count -= 1;
3017 } else {
3018 real_offset = next_nonstatic_oop_offset;
3019 next_nonstatic_oop_offset += heapOopSize;
3020 }
3021 // Update oop maps
3022 if( nonstatic_oop_map_count > 0 &&
3023 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3024 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * heapOopSize) ) {
3025 // Extend current oop map
3026 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1;
3027 } else {
3028 // Create new oop map
3029 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset;
3030 nonstatic_oop_length [nonstatic_oop_map_count] = 1;
3031 nonstatic_oop_map_count += 1;
3032 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3033 first_nonstatic_oop_offset = real_offset;
3034 }
3035 }
3036 break;
3037 case NONSTATIC_BYTE:
3038 if( nonstatic_byte_space_count > 0 ) {
3039 real_offset = nonstatic_byte_space_offset;
3040 nonstatic_byte_space_offset += 1;
3041 nonstatic_byte_space_count -= 1;
3042 } else {
3043 real_offset = next_nonstatic_byte_offset;
3044 next_nonstatic_byte_offset += 1;
3045 }
3046 break;
3047 case NONSTATIC_SHORT:
3048 if( nonstatic_short_space_count > 0 ) {
3049 real_offset = nonstatic_short_space_offset;
3050 nonstatic_short_space_offset += BytesPerShort;
3051 nonstatic_short_space_count -= 1;
3052 } else {
3053 real_offset = next_nonstatic_short_offset;
3054 next_nonstatic_short_offset += BytesPerShort;
3055 }
3056 break;
3057 case NONSTATIC_WORD:
3058 if( nonstatic_word_space_count > 0 ) {
3059 real_offset = nonstatic_word_space_offset;
3060 nonstatic_word_space_offset += BytesPerInt;
3061 nonstatic_word_space_count -= 1;
3062 } else {
3063 real_offset = next_nonstatic_word_offset;
3064 next_nonstatic_word_offset += BytesPerInt;
3065 }
3066 break;
3067 case NONSTATIC_ALIGNED_DOUBLE:
3068 case NONSTATIC_DOUBLE:
3069 real_offset = next_nonstatic_double_offset;
3070 next_nonstatic_double_offset += BytesPerLong;
3071 break;
3072 default:
3073 ShouldNotReachHere();
3074 }
3075 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) );
3076 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) );
3077 }
3078
3079 // Size of instances
3080 int instance_size;
3081
3082 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3083 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3084
3085 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3086
3087 // Size of non-static oop map blocks (in words) allocated at end of klass
3088 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset);
3089
3090 // Compute reference type
3091 ReferenceType rt;
3092 if (super_klass() == NULL) {
3093 rt = REF_NONE;
3094 } else {
3095 rt = super_klass->reference_type();
3096 }
3097
3098 // We can now create the basic klassOop for this klass
3099 klassOop ik = oopFactory::new_instanceKlass(
3100 vtable_size, itable_size,
3101 static_field_size, nonstatic_oop_map_size,
3102 rt, CHECK_(nullHandle));
3103 instanceKlassHandle this_klass (THREAD, ik);
3104
3105 assert(this_klass->static_field_size() == static_field_size &&
3106 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check");
3107
3108 // Fill in information already parsed
3109 this_klass->set_access_flags(access_flags);
3110 jint lh = Klass::instance_layout_helper(instance_size, false);
3111 this_klass->set_layout_helper(lh);
3112 assert(this_klass->oop_is_instance(), "layout is correct");
3113 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3114 // Not yet: supers are done below to support the new subtype-checking fields
3115 //this_klass->set_super(super_klass());
3116 this_klass->set_class_loader(class_loader());
3117 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3118 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3119 this_klass->set_static_oop_field_size(fac.static_oop_count);
3120 cp->set_pool_holder(this_klass());
3121 this_klass->set_constants(cp());
3122 this_klass->set_local_interfaces(local_interfaces());
3123 this_klass->set_fields(fields());
3124 this_klass->set_methods(methods());
3125 if (has_final_method) {
3126 this_klass->set_has_final_method();
3127 }
3128 this_klass->set_method_ordering(method_ordering());
3129 this_klass->set_initial_method_idnum(methods->length());
3130 this_klass->set_name(cp->klass_name_at(this_class_index));
3131 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3132 this_klass->set_protection_domain(protection_domain());
3133 this_klass->set_fields_annotations(fields_annotations());
3134 this_klass->set_methods_annotations(methods_annotations());
3135 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3136 this_klass->set_methods_default_annotations(methods_default_annotations());
3137
3138 this_klass->set_minor_version(minor_version);
3139 this_klass->set_major_version(major_version);
3140
3141 if (cached_class_file_bytes != NULL) {
3142 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3143 this_klass->set_cached_class_file(cached_class_file_bytes,
3144 cached_class_file_length);
3145 }
3146
3147 // Miranda methods
3148 if ((num_miranda_methods > 0) ||
3149 // if this class introduced new miranda methods or
3150 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3151 // super class exists and this class inherited miranda methods
3152 ) {
3153 this_klass->set_has_miranda_methods(); // then set a flag
3154 }
3155
3156 // Additional attributes
3157 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3158
3159 // Make sure this is the end of class file stream
3160 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3161
3162 // Initialize static fields
3163 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3164
3165 // VerifyOops believes that once this has been set, the object is completely loaded.
3166 // Compute transitive closure of interfaces this class implements
3167 this_klass->set_transitive_interfaces(transitive_interfaces());
3168
3169 // Fill in information needed to compute superclasses.
3170 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3171
3172 // Initialize itable offset tables
3173 klassItable::setup_itable_offset_table(this_klass);
3174
3175 // Do final class setup
3176 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length);
3177
3178 set_precomputed_flags(this_klass);
3179
3180 // reinitialize modifiers, using the InnerClasses attribute
3181 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3182 this_klass->set_modifier_flags(computed_modifiers);
3183
3184 // check if this class can access its super class
3185 check_super_class_access(this_klass, CHECK_(nullHandle));
3186
3187 // check if this class can access its superinterfaces
3188 check_super_interface_access(this_klass, CHECK_(nullHandle));
3189
3190 // check if this class overrides any final method
3191 check_final_method_override(this_klass, CHECK_(nullHandle));
3192
3193 // check that if this class is an interface then it doesn't have static methods
3194 if (this_klass->is_interface()) {
3195 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3196 }
3197
3198 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3199 false /* not shared class */);
3200
3201 if (TraceClassLoading) {
3202 // print in a single call to reduce interleaving of output
3203 if (cfs->source() != NULL) {
3204 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3205 cfs->source());
3206 } else if (class_loader.is_null()) {
3207 if (THREAD->is_Java_thread()) {
3208 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3209 tty->print("[Loaded %s by instance of %s]\n",
3210 this_klass->external_name(),
3211 instanceKlass::cast(caller)->external_name());
3212 } else {
3213 tty->print("[Loaded %s]\n", this_klass->external_name());
3214 }
3215 } else {
3216 ResourceMark rm;
3217 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3218 instanceKlass::cast(class_loader->klass())->external_name());
3219 }
3220 }
3221
3222 if (TraceClassResolution) {
3223 // print out the superclass.
3224 const char * from = Klass::cast(this_klass())->external_name();
3225 if (this_klass->java_super() != NULL) {
3226 tty->print("RESOLVE %s %s\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3227 }
3228 // print out each of the interface classes referred to by this class.
3229 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3230 if (!local_interfaces.is_null()) {
3231 int length = local_interfaces->length();
3232 for (int i = 0; i < length; i++) {
3233 klassOop k = klassOop(local_interfaces->obj_at(i));
3234 instanceKlass* to_class = instanceKlass::cast(k);
3235 const char * to = to_class->external_name();
3236 tty->print("RESOLVE %s %s\n", from, to);
3237 }
3238 }
3239 }
3240
3241 #ifndef PRODUCT
3242 if( PrintCompactFieldsSavings ) {
3243 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3244 tty->print("[Saved %d of %d bytes in %s]\n",
3245 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3246 orig_nonstatic_field_size*heapOopSize,
3247 this_klass->external_name());
3248 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3249 tty->print("[Wasted %d over %d bytes in %s]\n",
3250 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3251 orig_nonstatic_field_size*heapOopSize,
3252 this_klass->external_name());
3253 }
3254 }
3255 #endif
3256
3257 // preserve result across HandleMark
3258 preserve_this_klass = this_klass();
3259 }
3260
3261 // Create new handle outside HandleMark
3262 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3263 debug_only(this_klass->as_klassOop()->verify();)
3264
3265 return this_klass;
3266 }
3267
3268
3269 int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) {
3270 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size();
3271 if (nonstatic_oop_map_count > 0) {
3272 // We have oops to add to map
3273 if (map_size == 0) {
3274 map_size = nonstatic_oop_map_count;
3275 } else {
3276 // Check whether we should add a new map block or whether the last one can be extended
3277 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps();
3278 OopMapBlock* last_map = first_map + map_size - 1;
3279
3280 int next_offset = last_map->offset() + (last_map->length() * heapOopSize);
3281 if (next_offset == first_nonstatic_oop_offset) {
3282 // There is no gap bettwen superklass's last oop field and first
3283 // local oop field, merge maps.
3284 nonstatic_oop_map_count -= 1;
3285 } else {
3286 // Superklass didn't end with a oop field, add extra maps
3287 assert(next_offset<first_nonstatic_oop_offset, "just checking");
3288 }
3289 map_size += nonstatic_oop_map_count;
3290 }
3291 }
3292 return map_size;
3293 }
3294
3295
3296 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3297 int nonstatic_oop_map_count,
3298 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) {
3299 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3300 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size();
3301 instanceKlass* super = k->superklass();
3302 if (super != NULL) {
3303 int super_oop_map_size = super->nonstatic_oop_map_size();
3304 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3305 // Copy maps from superklass
3306 while (super_oop_map_size-- > 0) {
3307 *this_oop_map++ = *super_oop_map++;
3308 }
3309 }
3310 if (nonstatic_oop_map_count > 0) {
3311 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) {
3312 // Calculated in compute_oop_map_size() number of oop maps is less then
3313 // collected oop maps since there is no gap between superklass's last oop
3314 // field and first local oop field. Extend the last oop map copied
3315 // from the superklass instead of creating new one.
3316 nonstatic_oop_map_count--;
3317 nonstatic_oop_offsets++;
3318 this_oop_map--;
3319 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++);
3320 this_oop_map++;
3321 }
3322 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking");
3323 // Add new map blocks, fill them
3324 while (nonstatic_oop_map_count-- > 0) {
3325 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3326 this_oop_map->set_length(*nonstatic_oop_length++);
3327 this_oop_map++;
3328 }
3329 }
3330 }
3331
3332
3333 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3334 klassOop super = k->super();
3335
3336 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3337 // in which case we don't have to register objects as finalizable
3338 if (!_has_empty_finalizer) {
3339 if (_has_finalizer ||
3340 (super != NULL && super->klass_part()->has_finalizer())) {
3341 k->set_has_finalizer();
3342 }
3343 }
3344
3345 #ifdef ASSERT
3346 bool f = false;
3347 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3348 vmSymbols::void_method_signature());
3349 if (m != NULL && !m->is_empty_method()) {
3350 f = true;
3351 }
3352 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3353 #endif
3354
3355 // Check if this klass supports the java.lang.Cloneable interface
3356 if (SystemDictionary::cloneable_klass_loaded()) {
3357 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) {
3358 k->set_is_cloneable();
3359 }
3360 }
3361
3362 // Check if this klass has a vanilla default constructor
3363 if (super == NULL) {
3364 // java.lang.Object has empty default constructor
3365 k->set_has_vanilla_constructor();
3366 } else {
3367 if (Klass::cast(super)->has_vanilla_constructor() &&
3368 _has_vanilla_constructor) {
3369 k->set_has_vanilla_constructor();
3370 }
3371 #ifdef ASSERT
3372 bool v = false;
3373 if (Klass::cast(super)->has_vanilla_constructor()) {
3374 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3375 ), vmSymbols::void_method_signature());
3376 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3377 v = true;
3378 }
3379 }
3380 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3381 #endif
3382 }
3383
3384 // If it cannot be fast-path allocated, set a bit in the layout helper.
3385 // See documentation of instanceKlass::can_be_fastpath_allocated().
3386 assert(k->size_helper() > 0, "layout_helper is initialized");
3387 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3388 || k->is_abstract() || k->is_interface()
3389 || (k->name() == vmSymbols::java_lang_Class()
3390 && k->class_loader() == NULL)
3391 || k->size_helper() >= FastAllocateSizeLimit) {
3392 // Forbid fast-path allocation.
3393 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3394 k->set_layout_helper(lh);
3395 }
3396 }
3397
3398
3399 // utility method for appending and array with check for duplicates
3400
3401 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3402 // iterate over new interfaces
3403 for (int i = 0; i < ifs->length(); i++) {
3404 oop e = ifs->obj_at(i);
3405 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3406 // check for duplicates
3407 bool duplicate = false;
3408 for (int j = 0; j < index; j++) {
3409 if (result->obj_at(j) == e) {
3410 duplicate = true;
3411 break;
3412 }
3413 }
3414 // add new interface
3415 if (!duplicate) {
3416 result->obj_at_put(index++, e);
3417 }
3418 }
3419 }
3420
3421 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3422 // Compute maximum size for transitive interfaces
3423 int max_transitive_size = 0;
3424 int super_size = 0;
3425 // Add superclass transitive interfaces size
3426 if (super.not_null()) {
3427 super_size = super->transitive_interfaces()->length();
3428 max_transitive_size += super_size;
3429 }
3430 // Add local interfaces' super interfaces
3431 int local_size = local_ifs->length();
3432 for (int i = 0; i < local_size; i++) {
3433 klassOop l = klassOop(local_ifs->obj_at(i));
3434 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3435 }
3436 // Finally add local interfaces
3437 max_transitive_size += local_size;
3438 // Construct array
3439 objArrayHandle result;
3440 if (max_transitive_size == 0) {
3441 // no interfaces, use canonicalized array
3442 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3443 } else if (max_transitive_size == super_size) {
3444 // no new local interfaces added, share superklass' transitive interface array
3445 result = objArrayHandle(THREAD, super->transitive_interfaces());
3446 } else if (max_transitive_size == local_size) {
3447 // only local interfaces added, share local interface array
3448 result = local_ifs;
3449 } else {
3450 objArrayHandle nullHandle;
3451 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3452 result = objArrayHandle(THREAD, new_objarray);
3453 int index = 0;
3454 // Copy down from superclass
3455 if (super.not_null()) {
3456 append_interfaces(result, index, super->transitive_interfaces());
3457 }
3458 // Copy down from local interfaces' superinterfaces
3459 for (int i = 0; i < local_ifs->length(); i++) {
3460 klassOop l = klassOop(local_ifs->obj_at(i));
3461 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3462 }
3463 // Finally add local interfaces
3464 append_interfaces(result, index, local_ifs());
3465
3466 // Check if duplicates were removed
3467 if (index != max_transitive_size) {
3468 assert(index < max_transitive_size, "just checking");
3469 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3470 for (int i = 0; i < index; i++) {
3471 oop e = result->obj_at(i);
3472 assert(e != NULL, "just checking");
3473 new_result->obj_at_put(i, e);
3474 }
3475 result = objArrayHandle(THREAD, new_result);
3476 }
3477 }
3478 return result;
3479 }
3480
3481
3482 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3483 klassOop super = this_klass->super();
3484 if ((super != NULL) &&
3485 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3486 ResourceMark rm(THREAD);
3487 Exceptions::fthrow(
3488 THREAD_AND_LOCATION,
3489 vmSymbolHandles::java_lang_IllegalAccessError(),
3490 "class %s cannot access its superclass %s",
3491 this_klass->external_name(),
3492 instanceKlass::cast(super)->external_name()
3493 );
3494 return;
3495 }
3496 }
3497
3498
3499 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3500 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3501 int lng = local_interfaces->length();
3502 for (int i = lng - 1; i >= 0; i--) {
3503 klassOop k = klassOop(local_interfaces->obj_at(i));
3504 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3505 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3506 ResourceMark rm(THREAD);
3507 Exceptions::fthrow(
3508 THREAD_AND_LOCATION,
3509 vmSymbolHandles::java_lang_IllegalAccessError(),
3510 "class %s cannot access its superinterface %s",
3511 this_klass->external_name(),
3512 instanceKlass::cast(k)->external_name()
3513 );
3514 return;
3515 }
3516 }
3517 }
3518
3519
3520 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3521 objArrayHandle methods (THREAD, this_klass->methods());
3522 int num_methods = methods->length();
3523
3524 // go thru each method and check if it overrides a final method
3525 for (int index = 0; index < num_methods; index++) {
3526 methodOop m = (methodOop)methods->obj_at(index);
3527
3528 // skip private, static and <init> methods
3529 if ((!m->is_private()) &&
3530 (!m->is_static()) &&
3531 (m->name() != vmSymbols::object_initializer_name())) {
3532
3533 symbolOop name = m->name();
3534 symbolOop signature = m->signature();
3535 klassOop k = this_klass->super();
3536 methodOop super_m = NULL;
3537 while (k != NULL) {
3538 // skip supers that don't have final methods.
3539 if (k->klass_part()->has_final_method()) {
3540 // lookup a matching method in the super class hierarchy
3541 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3542 if (super_m == NULL) {
3543 break; // didn't find any match; get out
3544 }
3545
3546 if (super_m->is_final() &&
3547 // matching method in super is final
3548 (Reflection::verify_field_access(this_klass->as_klassOop(),
3549 super_m->method_holder(),
3550 super_m->method_holder(),
3551 super_m->access_flags(), false))
3552 // this class can access super final method and therefore override
3553 ) {
3554 ResourceMark rm(THREAD);
3555 Exceptions::fthrow(
3556 THREAD_AND_LOCATION,
3557 vmSymbolHandles::java_lang_VerifyError(),
3558 "class %s overrides final method %s.%s",
3559 this_klass->external_name(),
3560 name->as_C_string(),
3561 signature->as_C_string()
3562 );
3563 return;
3564 }
3565
3566 // continue to look from super_m's holder's super.
3567 k = instanceKlass::cast(super_m->method_holder())->super();
3568 continue;
3569 }
3570
3571 k = k->klass_part()->super();
3572 }
3573 }
3574 }
3575 }
3576
3577
3578 // assumes that this_klass is an interface
3579 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3580 assert(this_klass->is_interface(), "not an interface");
3581 objArrayHandle methods (THREAD, this_klass->methods());
3582 int num_methods = methods->length();
3583
3584 for (int index = 0; index < num_methods; index++) {
3585 methodOop m = (methodOop)methods->obj_at(index);
3586 // if m is static and not the init method, throw a verify error
3587 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3588 ResourceMark rm(THREAD);
3589 Exceptions::fthrow(
3590 THREAD_AND_LOCATION,
3591 vmSymbolHandles::java_lang_VerifyError(),
3592 "Illegal static method %s in interface %s",
3593 m->name()->as_C_string(),
3594 this_klass->external_name()
3595 );
3596 return;
3597 }
3598 }
3599 }
3600
3601 // utility methods for format checking
3602
3603 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3604 if (!_need_verify) { return; }
3605
3606 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3607 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3608 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3609 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3610 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3611 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3612 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3613
3614 if ((is_abstract && is_final) ||
3615 (is_interface && !is_abstract) ||
3616 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3617 (!is_interface && major_gte_15 && is_annotation)) {
3618 ResourceMark rm(THREAD);
3619 Exceptions::fthrow(
3620 THREAD_AND_LOCATION,
3621 vmSymbolHandles::java_lang_ClassFormatError(),
3622 "Illegal class modifiers in class %s: 0x%X",
3623 _class_name->as_C_string(), flags
3624 );
3625 return;
3626 }
3627 }
3628
3629 bool ClassFileParser::has_illegal_visibility(jint flags) {
3630 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3631 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3632 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3633
3634 return ((is_public && is_protected) ||
3635 (is_public && is_private) ||
3636 (is_protected && is_private));
3637 }
3638
3639 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3640 u2 max_version = JDK_Version::is_gte_jdk17x_version() ?
3641 JAVA_MAX_SUPPORTED_VERSION : JAVA_6_VERSION;
3642 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3643 (major <= max_version) &&
3644 ((major != max_version) ||
3645 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3646 }
3647
3648 void ClassFileParser::verify_legal_field_modifiers(
3649 jint flags, bool is_interface, TRAPS) {
3650 if (!_need_verify) { return; }
3651
3652 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3653 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3654 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3655 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3656 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3657 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3658 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3659 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3660 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3661
3662 bool is_illegal = false;
3663
3664 if (is_interface) {
3665 if (!is_public || !is_static || !is_final || is_private ||
3666 is_protected || is_volatile || is_transient ||
3667 (major_gte_15 && is_enum)) {
3668 is_illegal = true;
3669 }
3670 } else { // not interface
3671 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3672 is_illegal = true;
3673 }
3674 }
3675
3676 if (is_illegal) {
3677 ResourceMark rm(THREAD);
3678 Exceptions::fthrow(
3679 THREAD_AND_LOCATION,
3680 vmSymbolHandles::java_lang_ClassFormatError(),
3681 "Illegal field modifiers in class %s: 0x%X",
3682 _class_name->as_C_string(), flags);
3683 return;
3684 }
3685 }
3686
3687 void ClassFileParser::verify_legal_method_modifiers(
3688 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3689 if (!_need_verify) { return; }
3690
3691 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3692 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3693 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3694 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3695 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3696 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3697 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3698 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3699 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3700 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3701 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3702
3703 bool is_illegal = false;
3704
3705 if (is_interface) {
3706 if (!is_abstract || !is_public || is_static || is_final ||
3707 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3708 is_illegal = true;
3709 }
3710 } else { // not interface
3711 if (is_initializer) {
3712 if (is_static || is_final || is_synchronized || is_native ||
3713 is_abstract || (major_gte_15 && is_bridge)) {
3714 is_illegal = true;
3715 }
3716 } else { // not initializer
3717 if (is_abstract) {
3718 if ((is_final || is_native || is_private || is_static ||
3719 (major_gte_15 && (is_synchronized || is_strict)))) {
3720 is_illegal = true;
3721 }
3722 }
3723 if (has_illegal_visibility(flags)) {
3724 is_illegal = true;
3725 }
3726 }
3727 }
3728
3729 if (is_illegal) {
3730 ResourceMark rm(THREAD);
3731 Exceptions::fthrow(
3732 THREAD_AND_LOCATION,
3733 vmSymbolHandles::java_lang_ClassFormatError(),
3734 "Method %s in class %s has illegal modifiers: 0x%X",
3735 name->as_C_string(), _class_name->as_C_string(), flags);
3736 return;
3737 }
3738 }
3739
3740 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3741 assert(_need_verify, "only called when _need_verify is true");
3742 int i = 0;
3743 int count = length >> 2;
3744 for (int k=0; k<count; k++) {
3745 unsigned char b0 = buffer[i];
3746 unsigned char b1 = buffer[i+1];
3747 unsigned char b2 = buffer[i+2];
3748 unsigned char b3 = buffer[i+3];
3749 // For an unsigned char v,
3750 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3751 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3752 unsigned char res = b0 | b0 - 1 |
3753 b1 | b1 - 1 |
3754 b2 | b2 - 1 |
3755 b3 | b3 - 1;
3756 if (res >= 128) break;
3757 i += 4;
3758 }
3759 for(; i < length; i++) {
3760 unsigned short c;
3761 // no embedded zeros
3762 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3763 if(buffer[i] < 128) {
3764 continue;
3765 }
3766 if ((i + 5) < length) { // see if it's legal supplementary character
3767 if (UTF8::is_supplementary_character(&buffer[i])) {
3768 c = UTF8::get_supplementary_character(&buffer[i]);
3769 i += 5;
3770 continue;
3771 }
3772 }
3773 switch (buffer[i] >> 4) {
3774 default: break;
3775 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3776 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3777 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
3778 c = (buffer[i] & 0x1F) << 6;
3779 i++;
3780 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3781 c += buffer[i] & 0x3F;
3782 if (_major_version <= 47 || c == 0 || c >= 0x80) {
3783 // for classes with major > 47, c must a null or a character in its shortest form
3784 break;
3785 }
3786 }
3787 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3788 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
3789 c = (buffer[i] & 0xF) << 12;
3790 i += 2;
3791 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3792 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3793 if (_major_version <= 47 || c >= 0x800) {
3794 // for classes with major > 47, c must be in its shortest form
3795 break;
3796 }
3797 }
3798 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3799 } // end of switch
3800 } // end of for
3801 }
3802
3803 // Checks if name is a legal class name.
3804 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3805 if (!_need_verify || _relax_verify) { return; }
3806
3807 char buf[fixed_buffer_size];
3808 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3809 unsigned int length = name->utf8_length();
3810 bool legal = false;
3811
3812 if (length > 0) {
3813 char* p;
3814 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3815 p = skip_over_field_signature(bytes, false, length, CHECK);
3816 legal = (p != NULL) && ((p - bytes) == (int)length);
3817 } else if (_major_version < JAVA_1_5_VERSION) {
3818 if (bytes[0] != '<') {
3819 p = skip_over_field_name(bytes, true, length);
3820 legal = (p != NULL) && ((p - bytes) == (int)length);
3821 }
3822 } else {
3823 // 4900761: relax the constraints based on JSR202 spec
3824 // Class names may be drawn from the entire Unicode character set.
3825 // Identifiers between '/' must be unqualified names.
3826 // The utf8 string has been verified when parsing cpool entries.
3827 legal = verify_unqualified_name(bytes, length, LegalClass);
3828 }
3829 }
3830 if (!legal) {
3831 ResourceMark rm(THREAD);
3832 Exceptions::fthrow(
3833 THREAD_AND_LOCATION,
3834 vmSymbolHandles::java_lang_ClassFormatError(),
3835 "Illegal class name \"%s\" in class file %s", bytes,
3836 _class_name->as_C_string()
3837 );
3838 return;
3839 }
3840 }
3841
3842 // Checks if name is a legal field name.
3843 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3844 if (!_need_verify || _relax_verify) { return; }
3845
3846 char buf[fixed_buffer_size];
3847 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3848 unsigned int length = name->utf8_length();
3849 bool legal = false;
3850
3851 if (length > 0) {
3852 if (_major_version < JAVA_1_5_VERSION) {
3853 if (bytes[0] != '<') {
3854 char* p = skip_over_field_name(bytes, false, length);
3855 legal = (p != NULL) && ((p - bytes) == (int)length);
3856 }
3857 } else {
3858 // 4881221: relax the constraints based on JSR202 spec
3859 legal = verify_unqualified_name(bytes, length, LegalField);
3860 }
3861 }
3862
3863 if (!legal) {
3864 ResourceMark rm(THREAD);
3865 Exceptions::fthrow(
3866 THREAD_AND_LOCATION,
3867 vmSymbolHandles::java_lang_ClassFormatError(),
3868 "Illegal field name \"%s\" in class %s", bytes,
3869 _class_name->as_C_string()
3870 );
3871 return;
3872 }
3873 }
3874
3875 // Checks if name is a legal method name.
3876 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
3877 if (!_need_verify || _relax_verify) { return; }
3878
3879 assert(!name.is_null(), "method name is null");
3880 char buf[fixed_buffer_size];
3881 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3882 unsigned int length = name->utf8_length();
3883 bool legal = false;
3884
3885 if (length > 0) {
3886 if (bytes[0] == '<') {
3887 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
3888 legal = true;
3889 }
3890 } else if (_major_version < JAVA_1_5_VERSION) {
3891 char* p;
3892 p = skip_over_field_name(bytes, false, length);
3893 legal = (p != NULL) && ((p - bytes) == (int)length);
3894 } else {
3895 // 4881221: relax the constraints based on JSR202 spec
3896 legal = verify_unqualified_name(bytes, length, LegalMethod);
3897 }
3898 }
3899
3900 if (!legal) {
3901 ResourceMark rm(THREAD);
3902 Exceptions::fthrow(
3903 THREAD_AND_LOCATION,
3904 vmSymbolHandles::java_lang_ClassFormatError(),
3905 "Illegal method name \"%s\" in class %s", bytes,
3906 _class_name->as_C_string()
3907 );
3908 return;
3909 }
3910 }
3911
3912
3913 // Checks if signature is a legal field signature.
3914 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3915 if (!_need_verify) { return; }
3916
3917 char buf[fixed_buffer_size];
3918 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3919 unsigned int length = signature->utf8_length();
3920 char* p = skip_over_field_signature(bytes, false, length, CHECK);
3921
3922 if (p == NULL || (p - bytes) != (int)length) {
3923 ResourceMark rm(THREAD);
3924 Exceptions::fthrow(
3925 THREAD_AND_LOCATION,
3926 vmSymbolHandles::java_lang_ClassFormatError(),
3927 "Field \"%s\" in class %s has illegal signature \"%s\"",
3928 name->as_C_string(), _class_name->as_C_string(), bytes
3929 );
3930 return;
3931 }
3932 }
3933
3934 // Checks if signature is a legal method signature.
3935 // Returns number of parameters
3936 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3937 if (!_need_verify) {
3938 // make sure caller's args_size will be less than 0 even for non-static
3939 // method so it will be recomputed in compute_size_of_parameters().
3940 return -2;
3941 }
3942
3943 unsigned int args_size = 0;
3944 char buf[fixed_buffer_size];
3945 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3946 unsigned int length = signature->utf8_length();
3947 char* nextp;
3948
3949 // The first character must be a '('
3950 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
3951 length--;
3952 // Skip over legal field signatures
3953 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3954 while ((length > 0) && (nextp != NULL)) {
3955 args_size++;
3956 if (p[0] == 'J' || p[0] == 'D') {
3957 args_size++;
3958 }
3959 length -= nextp - p;
3960 p = nextp;
3961 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3962 }
3963 // The first non-signature thing better be a ')'
3964 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
3965 length--;
3966 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
3967 // All internal methods must return void
3968 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
3969 return args_size;
3970 }
3971 } else {
3972 // Now we better just have a return value
3973 nextp = skip_over_field_signature(p, true, length, CHECK_0);
3974 if (nextp && ((int)length == (nextp - p))) {
3975 return args_size;
3976 }
3977 }
3978 }
3979 }
3980 // Report error
3981 ResourceMark rm(THREAD);
3982 Exceptions::fthrow(
3983 THREAD_AND_LOCATION,
3984 vmSymbolHandles::java_lang_ClassFormatError(),
3985 "Method \"%s\" in class %s has illegal signature \"%s\"",
3986 name->as_C_string(), _class_name->as_C_string(), p
3987 );
3988 return 0;
3989 }
3990
3991
3992 // Unqualified names may not contain the characters '.', ';', or '/'.
3993 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
3994 // Note that method names may not be <init> or <clinit> in this method.
3995 // Because these names have been checked as special cases before calling this method
3996 // in verify_legal_method_name.
3997 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
3998 jchar ch;
3999
4000 for (char* p = name; p != name + length; ) {
4001 ch = *p;
4002 if (ch < 128) {
4003 p++;
4004 if (ch == '.' || ch == ';') {
4005 return false; // do not permit '.' or ';'
4006 }
4007 if (type != LegalClass && ch == '/') {
4008 return false; // do not permit '/' unless it's class name
4009 }
4010 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4011 return false; // do not permit '<' or '>' in method names
4012 }
4013 } else {
4014 char* tmp_p = UTF8::next(p, &ch);
4015 p = tmp_p;
4016 }
4017 }
4018 return true;
4019 }
4020
4021
4022 // Take pointer to a string. Skip over the longest part of the string that could
4023 // be taken as a fieldname. Allow '/' if slash_ok is true.
4024 // Return a pointer to just past the fieldname.
4025 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4026 // being true, we saw consecutive slashes (meaning we were looking for a
4027 // qualified path but found something that was badly-formed).
4028 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4029 char* p;
4030 jchar ch;
4031 jboolean last_is_slash = false;
4032 jboolean not_first_ch = false;
4033
4034 for (p = name; p != name + length; not_first_ch = true) {
4035 char* old_p = p;
4036 ch = *p;
4037 if (ch < 128) {
4038 p++;
4039 // quick check for ascii
4040 if ((ch >= 'a' && ch <= 'z') ||
4041 (ch >= 'A' && ch <= 'Z') ||
4042 (ch == '_' || ch == '$') ||
4043 (not_first_ch && ch >= '0' && ch <= '9')) {
4044 last_is_slash = false;
4045 continue;
4046 }
4047 if (slash_ok && ch == '/') {
4048 if (last_is_slash) {
4049 return NULL; // Don't permit consecutive slashes
4050 }
4051 last_is_slash = true;
4052 continue;
4053 }
4054 } else {
4055 jint unicode_ch;
4056 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4057 p = tmp_p;
4058 last_is_slash = false;
4059 // Check if ch is Java identifier start or is Java identifier part
4060 // 4672820: call java.lang.Character methods directly without generating separate tables.
4061 EXCEPTION_MARK;
4062 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass());
4063
4064 // return value
4065 JavaValue result(T_BOOLEAN);
4066 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4067 JavaCallArguments args;
4068 args.push_int(unicode_ch);
4069
4070 // public static boolean isJavaIdentifierStart(char ch);
4071 JavaCalls::call_static(&result,
4072 klass,
4073 vmSymbolHandles::isJavaIdentifierStart_name(),
4074 vmSymbolHandles::int_bool_signature(),
4075 &args,
4076 THREAD);
4077
4078 if (HAS_PENDING_EXCEPTION) {
4079 CLEAR_PENDING_EXCEPTION;
4080 return 0;
4081 }
4082 if (result.get_jboolean()) {
4083 continue;
4084 }
4085
4086 if (not_first_ch) {
4087 // public static boolean isJavaIdentifierPart(char ch);
4088 JavaCalls::call_static(&result,
4089 klass,
4090 vmSymbolHandles::isJavaIdentifierPart_name(),
4091 vmSymbolHandles::int_bool_signature(),
4092 &args,
4093 THREAD);
4094
4095 if (HAS_PENDING_EXCEPTION) {
4096 CLEAR_PENDING_EXCEPTION;
4097 return 0;
4098 }
4099
4100 if (result.get_jboolean()) {
4101 continue;
4102 }
4103 }
4104 }
4105 return (not_first_ch) ? old_p : NULL;
4106 }
4107 return (not_first_ch) ? p : NULL;
4108 }
4109
4110
4111 // Take pointer to a string. Skip over the longest part of the string that could
4112 // be taken as a field signature. Allow "void" if void_ok.
4113 // Return a pointer to just past the signature.
4114 // Return NULL if no legal signature is found.
4115 char* ClassFileParser::skip_over_field_signature(char* signature,
4116 bool void_ok,
4117 unsigned int length,
4118 TRAPS) {
4119 unsigned int array_dim = 0;
4120 while (length > 0) {
4121 switch (signature[0]) {
4122 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4123 case JVM_SIGNATURE_BOOLEAN:
4124 case JVM_SIGNATURE_BYTE:
4125 case JVM_SIGNATURE_CHAR:
4126 case JVM_SIGNATURE_SHORT:
4127 case JVM_SIGNATURE_INT:
4128 case JVM_SIGNATURE_FLOAT:
4129 case JVM_SIGNATURE_LONG:
4130 case JVM_SIGNATURE_DOUBLE:
4131 return signature + 1;
4132 case JVM_SIGNATURE_CLASS: {
4133 if (_major_version < JAVA_1_5_VERSION) {
4134 // Skip over the class name if one is there
4135 char* p = skip_over_field_name(signature + 1, true, --length);
4136
4137 // The next character better be a semicolon
4138 if (p && (p - signature) > 1 && p[0] == ';') {
4139 return p + 1;
4140 }
4141 } else {
4142 // 4900761: For class version > 48, any unicode is allowed in class name.
4143 length--;
4144 signature++;
4145 while (length > 0 && signature[0] != ';') {
4146 if (signature[0] == '.') {
4147 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4148 }
4149 length--;
4150 signature++;
4151 }
4152 if (signature[0] == ';') { return signature + 1; }
4153 }
4154
4155 return NULL;
4156 }
4157 case JVM_SIGNATURE_ARRAY:
4158 array_dim++;
4159 if (array_dim > 255) {
4160 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4161 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4162 }
4163 // The rest of what's there better be a legal signature
4164 signature++;
4165 length--;
4166 void_ok = false;
4167 break;
4168
4169 default:
4170 return NULL;
4171 }
4172 }
4173 return NULL;
4174 }