1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_classFileParser.cpp.incl"
27
28 // We generally try to create the oops directly when parsing, rather than allocating
29 // temporary data structures and copying the bytes twice. A temporary area is only
30 // needed when parsing utf8 entries in the constant pool and when parsing line number
31 // tables.
32
33 // We add assert in debug mode when class format is not checked.
34
35 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
36 #define JAVA_MIN_SUPPORTED_VERSION 45
37 #define JAVA_MAX_SUPPORTED_VERSION 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 // Before storing the symbol, make sure it's legal
172 if (_need_verify) {
173 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
174 }
175
176 unsigned int hash;
177 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
178 if (result == NULL) {
179 names[names_count] = (char*)utf8_buffer;
180 lengths[names_count] = utf8_length;
181 indices[names_count] = index;
182 hashValues[names_count++] = hash;
183 if (names_count == SymbolTable::symbol_alloc_batch_size) {
184 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
185 names_count = 0;
186 }
187 } else {
188 cp->symbol_at_put(index, result);
189 }
190 }
191 break;
192 default:
193 classfile_parse_error(
194 "Unknown constant tag %u in class file %s", tag, CHECK);
195 break;
196 }
197 }
198
199 // Allocate the remaining symbols
200 if (names_count > 0) {
201 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
202 }
203
204 // Copy _current pointer of local copy back to stream().
205 #ifdef ASSERT
206 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
207 #endif
208 cfs0->set_current(cfs1.current());
209 }
210
211 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
212
213 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
214 ClassFileStream* cfs = stream();
215 constantPoolHandle nullHandle;
216
217 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
218 u2 length = cfs->get_u2_fast();
219 guarantee_property(
220 length >= 1, "Illegal constant pool size %u in class file %s",
221 length, CHECK_(nullHandle));
222 constantPoolOop constant_pool =
223 oopFactory::new_constantPool(length, CHECK_(nullHandle));
224 constantPoolHandle cp (THREAD, constant_pool);
225
226 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
227
228 // parsing constant pool entries
229 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
230
231 int index = 1; // declared outside of loops for portability
232
233 // first verification pass - validate cross references and fixup class and string constants
234 for (index = 1; index < length; index++) { // Index 0 is unused
235 switch (cp->tag_at(index).value()) {
236 case JVM_CONSTANT_Class :
237 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
238 break;
239 case JVM_CONSTANT_Fieldref :
240 // fall through
241 case JVM_CONSTANT_Methodref :
242 // fall through
243 case JVM_CONSTANT_InterfaceMethodref : {
244 if (!_need_verify) break;
245 int klass_ref_index = cp->klass_ref_index_at(index);
246 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
247 check_property(valid_cp_range(klass_ref_index, length) &&
248 cp->tag_at(klass_ref_index).is_klass_reference(),
249 "Invalid constant pool index %u in class file %s",
250 klass_ref_index,
251 CHECK_(nullHandle));
252 check_property(valid_cp_range(name_and_type_ref_index, length) &&
253 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
254 "Invalid constant pool index %u in class file %s",
255 name_and_type_ref_index,
256 CHECK_(nullHandle));
257 break;
258 }
259 case JVM_CONSTANT_String :
260 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
261 break;
262 case JVM_CONSTANT_Integer :
263 break;
264 case JVM_CONSTANT_Float :
265 break;
266 case JVM_CONSTANT_Long :
267 case JVM_CONSTANT_Double :
268 index++;
269 check_property(
270 (index < length && cp->tag_at(index).is_invalid()),
271 "Improper constant pool long/double index %u in class file %s",
272 index, CHECK_(nullHandle));
273 break;
274 case JVM_CONSTANT_NameAndType : {
275 if (!_need_verify) break;
276 int name_ref_index = cp->name_ref_index_at(index);
277 int signature_ref_index = cp->signature_ref_index_at(index);
278 check_property(
279 valid_cp_range(name_ref_index, length) &&
280 cp->tag_at(name_ref_index).is_utf8(),
281 "Invalid constant pool index %u in class file %s",
282 name_ref_index, CHECK_(nullHandle));
283 check_property(
284 valid_cp_range(signature_ref_index, length) &&
285 cp->tag_at(signature_ref_index).is_utf8(),
286 "Invalid constant pool index %u in class file %s",
287 signature_ref_index, CHECK_(nullHandle));
288 break;
289 }
290 case JVM_CONSTANT_Utf8 :
291 break;
292 case JVM_CONSTANT_UnresolvedClass : // fall-through
293 case JVM_CONSTANT_UnresolvedClassInError:
294 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
295 break;
296 case JVM_CONSTANT_ClassIndex :
297 {
298 int class_index = cp->klass_index_at(index);
299 check_property(
300 valid_cp_range(class_index, length) &&
301 cp->tag_at(class_index).is_utf8(),
302 "Invalid constant pool index %u in class file %s",
303 class_index, CHECK_(nullHandle));
304 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
305 }
306 break;
307 case JVM_CONSTANT_UnresolvedString :
308 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
309 break;
310 case JVM_CONSTANT_StringIndex :
311 {
312 int string_index = cp->string_index_at(index);
313 check_property(
314 valid_cp_range(string_index, length) &&
315 cp->tag_at(string_index).is_utf8(),
316 "Invalid constant pool index %u in class file %s",
317 string_index, CHECK_(nullHandle));
318 symbolOop sym = cp->symbol_at(string_index);
319 cp->unresolved_string_at_put(index, sym);
320 }
321 break;
322 default:
323 fatal1("bad constant pool tag value %u", cp->tag_at(index).value());
324 ShouldNotReachHere();
325 break;
326 } // end of switch
327 } // end of for
328
329 if (!_need_verify) {
330 return cp;
331 }
332
333 // second verification pass - checks the strings are of the right format.
334 for (index = 1; index < length; index++) {
335 jbyte tag = cp->tag_at(index).value();
336 switch (tag) {
337 case JVM_CONSTANT_UnresolvedClass: {
338 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
339 verify_legal_class_name(class_name, CHECK_(nullHandle));
340 break;
341 }
342 case JVM_CONSTANT_Fieldref:
343 case JVM_CONSTANT_Methodref:
344 case JVM_CONSTANT_InterfaceMethodref: {
345 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
346 // already verified to be utf8
347 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
348 // already verified to be utf8
349 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
350 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
351 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
352 if (tag == JVM_CONSTANT_Fieldref) {
353 verify_legal_field_name(name, CHECK_(nullHandle));
354 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
355 } else {
356 verify_legal_method_name(name, CHECK_(nullHandle));
357 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
358 if (tag == JVM_CONSTANT_Methodref) {
359 // 4509014: If a class method name begins with '<', it must be "<init>".
360 assert(!name.is_null(), "method name in constant pool is null");
361 unsigned int name_len = name->utf8_length();
362 assert(name_len > 0, "bad method name"); // already verified as legal name
363 if (name->byte_at(0) == '<') {
364 if (name() != vmSymbols::object_initializer_name()) {
365 classfile_parse_error(
366 "Bad method name at constant pool index %u in class file %s",
367 name_ref_index, CHECK_(nullHandle));
368 }
369 }
370 }
371 }
372 break;
373 }
374 } // end of switch
375 } // end of for
376
377 return cp;
378 }
379
380
381 class NameSigHash: public ResourceObj {
382 public:
383 symbolOop _name; // name
384 symbolOop _sig; // signature
385 NameSigHash* _next; // Next entry in hash table
386 };
387
388
389 #define HASH_ROW_SIZE 256
390
391 unsigned int hash(symbolOop name, symbolOop sig) {
392 unsigned int raw_hash = 0;
393 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
394 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
395
396 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
397 }
398
399
400 void initialize_hashtable(NameSigHash** table) {
401 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
402 }
403
404 // Return false if the name/sig combination is found in table.
405 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
406 // The old format checker uses heap sort to find duplicates.
407 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
408 // of table since we don't expect symbolOop's to move.
409 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
410 assert(name != NULL, "name in constant pool is NULL");
411
412 // First lookup for duplicates
413 int index = hash(name, sig);
414 NameSigHash* entry = table[index];
415 while (entry != NULL) {
416 if (entry->_name == name && entry->_sig == sig) {
417 return false;
418 }
419 entry = entry->_next;
420 }
421
422 // No duplicate is found, allocate a new entry and fill it.
423 entry = new NameSigHash();
424 entry->_name = name;
425 entry->_sig = sig;
426
427 // Insert into hash table
428 entry->_next = table[index];
429 table[index] = entry;
430
431 return true;
432 }
433
434
435 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
436 int length,
437 Handle class_loader,
438 Handle protection_domain,
439 PerfTraceTime* vmtimer,
440 symbolHandle class_name,
441 TRAPS) {
442 ClassFileStream* cfs = stream();
443 assert(length > 0, "only called for length>0");
444 objArrayHandle nullHandle;
445 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
446 objArrayHandle interfaces (THREAD, interface_oop);
447
448 int index;
449 for (index = 0; index < length; index++) {
450 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
451 check_property(
452 valid_cp_range(interface_index, cp->length()) &&
453 cp->tag_at(interface_index).is_unresolved_klass(),
454 "Interface name has bad constant pool index %u in class file %s",
455 interface_index, CHECK_(nullHandle));
456 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
457
458 // Don't need to check legal name because it's checked when parsing constant pool.
459 // But need to make sure it's not an array type.
460 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
461 "Bad interface name in class file %s", CHECK_(nullHandle));
462
463 vmtimer->suspend(); // do not count recursive loading twice
464 // Call resolve_super so classcircularity is checked
465 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
466 unresolved_klass, class_loader, protection_domain,
467 false, CHECK_(nullHandle));
468 KlassHandle interf (THREAD, k);
469 vmtimer->resume();
470
471 if (!Klass::cast(interf())->is_interface()) {
472 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
473 }
474 interfaces->obj_at_put(index, interf());
475 }
476
477 if (!_need_verify || length <= 1) {
478 return interfaces;
479 }
480
481 // Check if there's any duplicates in interfaces
482 ResourceMark rm(THREAD);
483 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
484 THREAD, NameSigHash*, HASH_ROW_SIZE);
485 initialize_hashtable(interface_names);
486 bool dup = false;
487 {
488 debug_only(No_Safepoint_Verifier nsv;)
489 for (index = 0; index < length; index++) {
490 klassOop k = (klassOop)interfaces->obj_at(index);
491 symbolOop name = instanceKlass::cast(k)->name();
492 // If no duplicates, add (name, NULL) in hashtable interface_names.
493 if (!put_after_lookup(name, NULL, interface_names)) {
494 dup = true;
495 break;
496 }
497 }
498 }
499 if (dup) {
500 classfile_parse_error("Duplicate interface name in class file %s",
501 CHECK_(nullHandle));
502 }
503
504 return interfaces;
505 }
506
507
508 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
509 // Make sure the constant pool entry is of a type appropriate to this field
510 guarantee_property(
511 (constantvalue_index > 0 &&
512 constantvalue_index < cp->length()),
513 "Bad initial value index %u in ConstantValue attribute in class file %s",
514 constantvalue_index, CHECK);
515 constantTag value_type = cp->tag_at(constantvalue_index);
516 switch ( cp->basic_type_for_signature_at(signature_index) ) {
517 case T_LONG:
518 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
519 break;
520 case T_FLOAT:
521 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
522 break;
523 case T_DOUBLE:
524 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
525 break;
526 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
527 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
528 break;
529 case T_OBJECT:
530 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18)
531 && (value_type.is_string() || value_type.is_unresolved_string())),
532 "Bad string initial value in class file %s", CHECK);
533 break;
534 default:
535 classfile_parse_error(
536 "Unable to set initial value %u in class file %s",
537 constantvalue_index, CHECK);
538 }
539 }
540
541
542 // Parse attributes for a field.
543 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
544 u2 attributes_count,
545 bool is_static, u2 signature_index,
546 u2* constantvalue_index_addr,
547 bool* is_synthetic_addr,
548 u2* generic_signature_index_addr,
549 typeArrayHandle* field_annotations,
550 TRAPS) {
551 ClassFileStream* cfs = stream();
552 assert(attributes_count > 0, "length should be greater than 0");
553 u2 constantvalue_index = 0;
554 u2 generic_signature_index = 0;
555 bool is_synthetic = false;
556 u1* runtime_visible_annotations = NULL;
557 int runtime_visible_annotations_length = 0;
558 u1* runtime_invisible_annotations = NULL;
559 int runtime_invisible_annotations_length = 0;
560 while (attributes_count--) {
561 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
562 u2 attribute_name_index = cfs->get_u2_fast();
563 u4 attribute_length = cfs->get_u4_fast();
564 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
565 cp->tag_at(attribute_name_index).is_utf8(),
566 "Invalid field attribute index %u in class file %s",
567 attribute_name_index,
568 CHECK);
569 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
570 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
571 // ignore if non-static
572 if (constantvalue_index != 0) {
573 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
574 }
575 check_property(
576 attribute_length == 2,
577 "Invalid ConstantValue field attribute length %u in class file %s",
578 attribute_length, CHECK);
579 constantvalue_index = cfs->get_u2(CHECK);
580 if (_need_verify) {
581 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
582 }
583 } else if (attribute_name == vmSymbols::tag_synthetic()) {
584 if (attribute_length != 0) {
585 classfile_parse_error(
586 "Invalid Synthetic field attribute length %u in class file %s",
587 attribute_length, CHECK);
588 }
589 is_synthetic = true;
590 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
591 if (attribute_length != 0) {
592 classfile_parse_error(
593 "Invalid Deprecated field attribute length %u in class file %s",
594 attribute_length, CHECK);
595 }
596 } else if (_major_version >= JAVA_1_5_VERSION) {
597 if (attribute_name == vmSymbols::tag_signature()) {
598 if (attribute_length != 2) {
599 classfile_parse_error(
600 "Wrong size %u for field's Signature attribute in class file %s",
601 attribute_length, CHECK);
602 }
603 generic_signature_index = cfs->get_u2(CHECK);
604 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
605 runtime_visible_annotations_length = attribute_length;
606 runtime_visible_annotations = cfs->get_u1_buffer();
607 assert(runtime_visible_annotations != NULL, "null visible annotations");
608 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
609 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
610 runtime_invisible_annotations_length = attribute_length;
611 runtime_invisible_annotations = cfs->get_u1_buffer();
612 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
613 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
614 } else {
615 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
616 }
617 } else {
618 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
619 }
620 }
621
622 *constantvalue_index_addr = constantvalue_index;
623 *is_synthetic_addr = is_synthetic;
624 *generic_signature_index_addr = generic_signature_index;
625 *field_annotations = assemble_annotations(runtime_visible_annotations,
626 runtime_visible_annotations_length,
627 runtime_invisible_annotations,
628 runtime_invisible_annotations_length,
629 CHECK);
630 return;
631 }
632
633
634 // Field allocation types. Used for computing field offsets.
635
636 enum FieldAllocationType {
637 STATIC_OOP, // Oops
638 STATIC_BYTE, // Boolean, Byte, char
639 STATIC_SHORT, // shorts
640 STATIC_WORD, // ints
641 STATIC_DOUBLE, // long or double
642 STATIC_ALIGNED_DOUBLE,// aligned long or double
643 NONSTATIC_OOP,
644 NONSTATIC_BYTE,
645 NONSTATIC_SHORT,
646 NONSTATIC_WORD,
647 NONSTATIC_DOUBLE,
648 NONSTATIC_ALIGNED_DOUBLE
649 };
650
651
652 struct FieldAllocationCount {
653 int static_oop_count;
654 int static_byte_count;
655 int static_short_count;
656 int static_word_count;
657 int static_double_count;
658 int nonstatic_oop_count;
659 int nonstatic_byte_count;
660 int nonstatic_short_count;
661 int nonstatic_word_count;
662 int nonstatic_double_count;
663 };
664
665 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
666 struct FieldAllocationCount *fac,
667 objArrayHandle* fields_annotations, TRAPS) {
668 ClassFileStream* cfs = stream();
669 typeArrayHandle nullHandle;
670 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
671 u2 length = cfs->get_u2_fast();
672 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
673 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
674 typeArrayHandle fields(THREAD, new_fields);
675
676 int index = 0;
677 typeArrayHandle field_annotations;
678 for (int n = 0; n < length; n++) {
679 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
680
681 AccessFlags access_flags;
682 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
683 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
684 access_flags.set_flags(flags);
685
686 u2 name_index = cfs->get_u2_fast();
687 int cp_size = cp->length();
688 check_property(
689 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
690 "Invalid constant pool index %u for field name in class file %s",
691 name_index, CHECK_(nullHandle));
692 symbolHandle name(THREAD, cp->symbol_at(name_index));
693 verify_legal_field_name(name, CHECK_(nullHandle));
694
695 u2 signature_index = cfs->get_u2_fast();
696 check_property(
697 valid_cp_range(signature_index, cp_size) &&
698 cp->tag_at(signature_index).is_utf8(),
699 "Invalid constant pool index %u for field signature in class file %s",
700 signature_index, CHECK_(nullHandle));
701 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
702 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
703
704 u2 constantvalue_index = 0;
705 bool is_synthetic = false;
706 u2 generic_signature_index = 0;
707 bool is_static = access_flags.is_static();
708
709 u2 attributes_count = cfs->get_u2_fast();
710 if (attributes_count > 0) {
711 parse_field_attributes(cp, attributes_count, is_static, signature_index,
712 &constantvalue_index, &is_synthetic,
713 &generic_signature_index, &field_annotations,
714 CHECK_(nullHandle));
715 if (field_annotations.not_null()) {
716 if (fields_annotations->is_null()) {
717 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
718 *fields_annotations = objArrayHandle(THREAD, md);
719 }
720 (*fields_annotations)->obj_at_put(n, field_annotations());
721 }
722 if (is_synthetic) {
723 access_flags.set_is_synthetic();
724 }
725 }
726
727 fields->short_at_put(index++, access_flags.as_short());
728 fields->short_at_put(index++, name_index);
729 fields->short_at_put(index++, signature_index);
730 fields->short_at_put(index++, constantvalue_index);
731
732 // Remember how many oops we encountered and compute allocation type
733 BasicType type = cp->basic_type_for_signature_at(signature_index);
734 FieldAllocationType atype;
735 if ( is_static ) {
736 switch ( type ) {
737 case T_BOOLEAN:
738 case T_BYTE:
739 fac->static_byte_count++;
740 atype = STATIC_BYTE;
741 break;
742 case T_LONG:
743 case T_DOUBLE:
744 if (Universe::field_type_should_be_aligned(type)) {
745 atype = STATIC_ALIGNED_DOUBLE;
746 } else {
747 atype = STATIC_DOUBLE;
748 }
749 fac->static_double_count++;
750 break;
751 case T_CHAR:
752 case T_SHORT:
753 fac->static_short_count++;
754 atype = STATIC_SHORT;
755 break;
756 case T_FLOAT:
757 case T_INT:
758 fac->static_word_count++;
759 atype = STATIC_WORD;
760 break;
761 case T_ARRAY:
762 case T_OBJECT:
763 fac->static_oop_count++;
764 atype = STATIC_OOP;
765 break;
766 case T_ADDRESS:
767 case T_VOID:
768 default:
769 assert(0, "bad field type");
770 }
771 } else {
772 switch ( type ) {
773 case T_BOOLEAN:
774 case T_BYTE:
775 fac->nonstatic_byte_count++;
776 atype = NONSTATIC_BYTE;
777 break;
778 case T_LONG:
779 case T_DOUBLE:
780 if (Universe::field_type_should_be_aligned(type)) {
781 atype = NONSTATIC_ALIGNED_DOUBLE;
782 } else {
783 atype = NONSTATIC_DOUBLE;
784 }
785 fac->nonstatic_double_count++;
786 break;
787 case T_CHAR:
788 case T_SHORT:
789 fac->nonstatic_short_count++;
790 atype = NONSTATIC_SHORT;
791 break;
792 case T_FLOAT:
793 case T_INT:
794 fac->nonstatic_word_count++;
795 atype = NONSTATIC_WORD;
796 break;
797 case T_ARRAY:
798 case T_OBJECT:
799 fac->nonstatic_oop_count++;
800 atype = NONSTATIC_OOP;
801 break;
802 case T_ADDRESS:
803 case T_VOID:
804 default:
805 assert(0, "bad field type");
806 }
807 }
808
809 // The correct offset is computed later (all oop fields will be located together)
810 // We temporarily store the allocation type in the offset field
811 fields->short_at_put(index++, atype);
812 fields->short_at_put(index++, 0); // Clear out high word of byte offset
813 fields->short_at_put(index++, generic_signature_index);
814 }
815
816 if (_need_verify && length > 1) {
817 // Check duplicated fields
818 ResourceMark rm(THREAD);
819 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
820 THREAD, NameSigHash*, HASH_ROW_SIZE);
821 initialize_hashtable(names_and_sigs);
822 bool dup = false;
823 {
824 debug_only(No_Safepoint_Verifier nsv;)
825 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
826 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
827 symbolOop name = cp->symbol_at(name_index);
828 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
829 symbolOop sig = cp->symbol_at(sig_index);
830 // If no duplicates, add name/signature in hashtable names_and_sigs.
831 if (!put_after_lookup(name, sig, names_and_sigs)) {
832 dup = true;
833 break;
834 }
835 }
836 }
837 if (dup) {
838 classfile_parse_error("Duplicate field name&signature in class file %s",
839 CHECK_(nullHandle));
840 }
841 }
842
843 return fields;
844 }
845
846
847 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
848 while (length-- > 0) {
849 *dest++ = Bytes::get_Java_u2((u1*) (src++));
850 }
851 }
852
853
854 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
855 u4 exception_table_length,
856 constantPoolHandle cp,
857 TRAPS) {
858 ClassFileStream* cfs = stream();
859 typeArrayHandle nullHandle;
860
861 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
862 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
863 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
864
865 int index = 0;
866 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
867 for (unsigned int i = 0; i < exception_table_length; i++) {
868 u2 start_pc = cfs->get_u2_fast();
869 u2 end_pc = cfs->get_u2_fast();
870 u2 handler_pc = cfs->get_u2_fast();
871 u2 catch_type_index = cfs->get_u2_fast();
872 // Will check legal target after parsing code array in verifier.
873 if (_need_verify) {
874 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
875 "Illegal exception table range in class file %s", CHECK_(nullHandle));
876 guarantee_property(handler_pc < code_length,
877 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
878 if (catch_type_index != 0) {
879 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
880 (cp->tag_at(catch_type_index).is_klass() ||
881 cp->tag_at(catch_type_index).is_unresolved_klass()),
882 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
883 }
884 }
885 exception_handlers->int_at_put(index++, start_pc);
886 exception_handlers->int_at_put(index++, end_pc);
887 exception_handlers->int_at_put(index++, handler_pc);
888 exception_handlers->int_at_put(index++, catch_type_index);
889 }
890 return exception_handlers;
891 }
892
893 void ClassFileParser::parse_linenumber_table(
894 u4 code_attribute_length, u4 code_length,
895 CompressedLineNumberWriteStream** write_stream, TRAPS) {
896 ClassFileStream* cfs = stream();
897 unsigned int num_entries = cfs->get_u2(CHECK);
898
899 // Each entry is a u2 start_pc, and a u2 line_number
900 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
901
902 // Verify line number attribute and table length
903 check_property(
904 code_attribute_length == sizeof(u2) + length_in_bytes,
905 "LineNumberTable attribute has wrong length in class file %s", CHECK);
906
907 cfs->guarantee_more(length_in_bytes, CHECK);
908
909 if ((*write_stream) == NULL) {
910 if (length_in_bytes > fixed_buffer_size) {
911 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
912 } else {
913 (*write_stream) = new CompressedLineNumberWriteStream(
914 linenumbertable_buffer, fixed_buffer_size);
915 }
916 }
917
918 while (num_entries-- > 0) {
919 u2 bci = cfs->get_u2_fast(); // start_pc
920 u2 line = cfs->get_u2_fast(); // line_number
921 guarantee_property(bci < code_length,
922 "Invalid pc in LineNumberTable in class file %s", CHECK);
923 (*write_stream)->write_pair(bci, line);
924 }
925 }
926
927
928 // Class file LocalVariableTable elements.
929 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
930 public:
931 u2 start_bci;
932 u2 length;
933 u2 name_cp_index;
934 u2 descriptor_cp_index;
935 u2 slot;
936 };
937
938
939 class LVT_Hash: public CHeapObj {
940 public:
941 LocalVariableTableElement *_elem; // element
942 LVT_Hash* _next; // Next entry in hash table
943 };
944
945 unsigned int hash(LocalVariableTableElement *elem) {
946 unsigned int raw_hash = elem->start_bci;
947
948 raw_hash = elem->length + raw_hash * 37;
949 raw_hash = elem->name_cp_index + raw_hash * 37;
950 raw_hash = elem->slot + raw_hash * 37;
951
952 return raw_hash % HASH_ROW_SIZE;
953 }
954
955 void initialize_hashtable(LVT_Hash** table) {
956 for (int i = 0; i < HASH_ROW_SIZE; i++) {
957 table[i] = NULL;
958 }
959 }
960
961 void clear_hashtable(LVT_Hash** table) {
962 for (int i = 0; i < HASH_ROW_SIZE; i++) {
963 LVT_Hash* current = table[i];
964 LVT_Hash* next;
965 while (current != NULL) {
966 next = current->_next;
967 current->_next = NULL;
968 delete(current);
969 current = next;
970 }
971 table[i] = NULL;
972 }
973 }
974
975 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
976 LVT_Hash* entry = table[index];
977
978 /*
979 * 3-tuple start_bci/length/slot has to be unique key,
980 * so the following comparison seems to be redundant:
981 * && elem->name_cp_index == entry->_elem->name_cp_index
982 */
983 while (entry != NULL) {
984 if (elem->start_bci == entry->_elem->start_bci
985 && elem->length == entry->_elem->length
986 && elem->name_cp_index == entry->_elem->name_cp_index
987 && elem->slot == entry->_elem->slot
988 ) {
989 return entry;
990 }
991 entry = entry->_next;
992 }
993 return NULL;
994 }
995
996 // Return false if the local variable is found in table.
997 // Return true if no duplicate is found.
998 // And local variable is added as a new entry in table.
999 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1000 // First lookup for duplicates
1001 int index = hash(elem);
1002 LVT_Hash* entry = LVT_lookup(elem, index, table);
1003
1004 if (entry != NULL) {
1005 return false;
1006 }
1007 // No duplicate is found, allocate a new entry and fill it.
1008 if ((entry = new LVT_Hash()) == NULL) {
1009 return false;
1010 }
1011 entry->_elem = elem;
1012
1013 // Insert into hash table
1014 entry->_next = table[index];
1015 table[index] = entry;
1016
1017 return true;
1018 }
1019
1020 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1021 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1022 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1023 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1024 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1025 lvt->signature_cp_index = 0;
1026 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1027 }
1028
1029 // Function is used to parse both attributes:
1030 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1031 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1032 u2 max_locals,
1033 u4 code_attribute_length,
1034 constantPoolHandle cp,
1035 u2* localvariable_table_length,
1036 bool isLVTT,
1037 TRAPS) {
1038 ClassFileStream* cfs = stream();
1039 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1040 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1041 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1042 // Verify local variable table attribute has right length
1043 if (_need_verify) {
1044 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1045 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1046 }
1047 u2* localvariable_table_start = cfs->get_u2_buffer();
1048 assert(localvariable_table_start != NULL, "null local variable table");
1049 if (!_need_verify) {
1050 cfs->skip_u2_fast(size);
1051 } else {
1052 cfs->guarantee_more(size * 2, CHECK_NULL);
1053 for(int i = 0; i < (*localvariable_table_length); i++) {
1054 u2 start_pc = cfs->get_u2_fast();
1055 u2 length = cfs->get_u2_fast();
1056 u2 name_index = cfs->get_u2_fast();
1057 u2 descriptor_index = cfs->get_u2_fast();
1058 u2 index = cfs->get_u2_fast();
1059 // Assign to a u4 to avoid overflow
1060 u4 end_pc = (u4)start_pc + (u4)length;
1061
1062 if (start_pc >= code_length) {
1063 classfile_parse_error(
1064 "Invalid start_pc %u in %s in class file %s",
1065 start_pc, tbl_name, CHECK_NULL);
1066 }
1067 if (end_pc > code_length) {
1068 classfile_parse_error(
1069 "Invalid length %u in %s in class file %s",
1070 length, tbl_name, CHECK_NULL);
1071 }
1072 int cp_size = cp->length();
1073 guarantee_property(
1074 valid_cp_range(name_index, cp_size) &&
1075 cp->tag_at(name_index).is_utf8(),
1076 "Name index %u in %s has bad constant type in class file %s",
1077 name_index, tbl_name, CHECK_NULL);
1078 guarantee_property(
1079 valid_cp_range(descriptor_index, cp_size) &&
1080 cp->tag_at(descriptor_index).is_utf8(),
1081 "Signature index %u in %s has bad constant type in class file %s",
1082 descriptor_index, tbl_name, CHECK_NULL);
1083
1084 symbolHandle name(THREAD, cp->symbol_at(name_index));
1085 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1086 verify_legal_field_name(name, CHECK_NULL);
1087 u2 extra_slot = 0;
1088 if (!isLVTT) {
1089 verify_legal_field_signature(name, sig, CHECK_NULL);
1090
1091 // 4894874: check special cases for double and long local variables
1092 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1093 sig() == vmSymbols::type_signature(T_LONG)) {
1094 extra_slot = 1;
1095 }
1096 }
1097 guarantee_property((index + extra_slot) < max_locals,
1098 "Invalid index %u in %s in class file %s",
1099 index, tbl_name, CHECK_NULL);
1100 }
1101 }
1102 return localvariable_table_start;
1103 }
1104
1105
1106 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1107 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1108 ClassFileStream* cfs = stream();
1109 u2 index = 0; // index in the array with long/double occupying two slots
1110 u4 i1 = *u1_index;
1111 u4 i2 = *u2_index + 1;
1112 for(int i = 0; i < array_length; i++) {
1113 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1114 index++;
1115 if (tag == ITEM_Long || tag == ITEM_Double) {
1116 index++;
1117 } else if (tag == ITEM_Object) {
1118 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1119 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1120 cp->tag_at(class_index).is_unresolved_klass(),
1121 "Bad class index %u in StackMap in class file %s",
1122 class_index, CHECK);
1123 } else if (tag == ITEM_Uninitialized) {
1124 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1125 guarantee_property(
1126 offset < code_length,
1127 "Bad uninitialized type offset %u in StackMap in class file %s",
1128 offset, CHECK);
1129 } else {
1130 guarantee_property(
1131 tag <= (u1)ITEM_Uninitialized,
1132 "Unknown variable type %u in StackMap in class file %s",
1133 tag, CHECK);
1134 }
1135 }
1136 u2_array[*u2_index] = index;
1137 *u1_index = i1;
1138 *u2_index = i2;
1139 }
1140
1141 typeArrayOop ClassFileParser::parse_stackmap_table(
1142 u4 code_attribute_length, TRAPS) {
1143 if (code_attribute_length == 0)
1144 return NULL;
1145
1146 ClassFileStream* cfs = stream();
1147 u1* stackmap_table_start = cfs->get_u1_buffer();
1148 assert(stackmap_table_start != NULL, "null stackmap table");
1149
1150 // check code_attribute_length first
1151 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1152
1153 if (!_need_verify && !DumpSharedSpaces) {
1154 return NULL;
1155 }
1156
1157 typeArrayOop stackmap_data =
1158 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1159
1160 stackmap_data->set_length(code_attribute_length);
1161 memcpy((void*)stackmap_data->byte_at_addr(0),
1162 (void*)stackmap_table_start, code_attribute_length);
1163 return stackmap_data;
1164 }
1165
1166 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1167 u4 method_attribute_length,
1168 constantPoolHandle cp, TRAPS) {
1169 ClassFileStream* cfs = stream();
1170 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1171 *checked_exceptions_length = cfs->get_u2_fast();
1172 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1173 u2* checked_exceptions_start = cfs->get_u2_buffer();
1174 assert(checked_exceptions_start != NULL, "null checked exceptions");
1175 if (!_need_verify) {
1176 cfs->skip_u2_fast(size);
1177 } else {
1178 // Verify each value in the checked exception table
1179 u2 checked_exception;
1180 u2 len = *checked_exceptions_length;
1181 cfs->guarantee_more(2 * len, CHECK_NULL);
1182 for (int i = 0; i < len; i++) {
1183 checked_exception = cfs->get_u2_fast();
1184 check_property(
1185 valid_cp_range(checked_exception, cp->length()) &&
1186 cp->tag_at(checked_exception).is_klass_reference(),
1187 "Exception name has bad type at constant pool %u in class file %s",
1188 checked_exception, CHECK_NULL);
1189 }
1190 }
1191 // check exceptions attribute length
1192 if (_need_verify) {
1193 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1194 sizeof(u2) * size),
1195 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1196 }
1197 return checked_exceptions_start;
1198 }
1199
1200
1201 #define MAX_ARGS_SIZE 255
1202 #define MAX_CODE_SIZE 65535
1203 #define INITIAL_MAX_LVT_NUMBER 256
1204
1205 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1206 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1207 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1208 // entire method attribute is parsed.
1209 //
1210 // The promoted_flags parameter is used to pass relevant access_flags
1211 // from the method back up to the containing klass. These flag values
1212 // are added to klass's access_flags.
1213
1214 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1215 AccessFlags *promoted_flags,
1216 typeArrayHandle* method_annotations,
1217 typeArrayHandle* method_parameter_annotations,
1218 typeArrayHandle* method_default_annotations,
1219 TRAPS) {
1220 ClassFileStream* cfs = stream();
1221 methodHandle nullHandle;
1222 ResourceMark rm(THREAD);
1223 // Parse fixed parts
1224 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1225
1226 int flags = cfs->get_u2_fast();
1227 u2 name_index = cfs->get_u2_fast();
1228 int cp_size = cp->length();
1229 check_property(
1230 valid_cp_range(name_index, cp_size) &&
1231 cp->tag_at(name_index).is_utf8(),
1232 "Illegal constant pool index %u for method name in class file %s",
1233 name_index, CHECK_(nullHandle));
1234 symbolHandle name(THREAD, cp->symbol_at(name_index));
1235 verify_legal_method_name(name, CHECK_(nullHandle));
1236
1237 u2 signature_index = cfs->get_u2_fast();
1238 guarantee_property(
1239 valid_cp_range(signature_index, cp_size) &&
1240 cp->tag_at(signature_index).is_utf8(),
1241 "Illegal constant pool index %u for method signature in class file %s",
1242 signature_index, CHECK_(nullHandle));
1243 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1244
1245 AccessFlags access_flags;
1246 if (name == vmSymbols::class_initializer_name()) {
1247 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1248 flags = JVM_ACC_STATIC;
1249 } else {
1250 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1251 }
1252
1253 int args_size = -1; // only used when _need_verify is true
1254 if (_need_verify) {
1255 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1256 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1257 if (args_size > MAX_ARGS_SIZE) {
1258 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1259 }
1260 }
1261
1262 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1263
1264 // Default values for code and exceptions attribute elements
1265 u2 max_stack = 0;
1266 u2 max_locals = 0;
1267 u4 code_length = 0;
1268 u1* code_start = 0;
1269 u2 exception_table_length = 0;
1270 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1271 u2 checked_exceptions_length = 0;
1272 u2* checked_exceptions_start = NULL;
1273 CompressedLineNumberWriteStream* linenumber_table = NULL;
1274 int linenumber_table_length = 0;
1275 int total_lvt_length = 0;
1276 u2 lvt_cnt = 0;
1277 u2 lvtt_cnt = 0;
1278 bool lvt_allocated = false;
1279 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1280 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1281 u2* localvariable_table_length;
1282 u2** localvariable_table_start;
1283 u2* localvariable_type_table_length;
1284 u2** localvariable_type_table_start;
1285 bool parsed_code_attribute = false;
1286 bool parsed_checked_exceptions_attribute = false;
1287 bool parsed_stackmap_attribute = false;
1288 // stackmap attribute - JDK1.5
1289 typeArrayHandle stackmap_data;
1290 u2 generic_signature_index = 0;
1291 u1* runtime_visible_annotations = NULL;
1292 int runtime_visible_annotations_length = 0;
1293 u1* runtime_invisible_annotations = NULL;
1294 int runtime_invisible_annotations_length = 0;
1295 u1* runtime_visible_parameter_annotations = NULL;
1296 int runtime_visible_parameter_annotations_length = 0;
1297 u1* runtime_invisible_parameter_annotations = NULL;
1298 int runtime_invisible_parameter_annotations_length = 0;
1299 u1* annotation_default = NULL;
1300 int annotation_default_length = 0;
1301
1302 // Parse code and exceptions attribute
1303 u2 method_attributes_count = cfs->get_u2_fast();
1304 while (method_attributes_count--) {
1305 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1306 u2 method_attribute_name_index = cfs->get_u2_fast();
1307 u4 method_attribute_length = cfs->get_u4_fast();
1308 check_property(
1309 valid_cp_range(method_attribute_name_index, cp_size) &&
1310 cp->tag_at(method_attribute_name_index).is_utf8(),
1311 "Invalid method attribute name index %u in class file %s",
1312 method_attribute_name_index, CHECK_(nullHandle));
1313
1314 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1315 if (method_attribute_name == vmSymbols::tag_code()) {
1316 // Parse Code attribute
1317 if (_need_verify) {
1318 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1319 "Code attribute in native or abstract methods in class file %s",
1320 CHECK_(nullHandle));
1321 }
1322 if (parsed_code_attribute) {
1323 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1324 }
1325 parsed_code_attribute = true;
1326
1327 // Stack size, locals size, and code size
1328 if (_major_version == 45 && _minor_version <= 2) {
1329 cfs->guarantee_more(4, CHECK_(nullHandle));
1330 max_stack = cfs->get_u1_fast();
1331 max_locals = cfs->get_u1_fast();
1332 code_length = cfs->get_u2_fast();
1333 } else {
1334 cfs->guarantee_more(8, CHECK_(nullHandle));
1335 max_stack = cfs->get_u2_fast();
1336 max_locals = cfs->get_u2_fast();
1337 code_length = cfs->get_u4_fast();
1338 }
1339 if (_need_verify) {
1340 guarantee_property(args_size <= max_locals,
1341 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1342 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1343 "Invalid method Code length %u in class file %s",
1344 code_length, CHECK_(nullHandle));
1345 }
1346 // Code pointer
1347 code_start = cfs->get_u1_buffer();
1348 assert(code_start != NULL, "null code start");
1349 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1350 cfs->skip_u1_fast(code_length);
1351
1352 // Exception handler table
1353 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1354 exception_table_length = cfs->get_u2_fast();
1355 if (exception_table_length > 0) {
1356 exception_handlers =
1357 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1358 }
1359
1360 // Parse additional attributes in code attribute
1361 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1362 u2 code_attributes_count = cfs->get_u2_fast();
1363
1364 unsigned int calculated_attribute_length = 0;
1365
1366 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1367 calculated_attribute_length =
1368 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1369 } else {
1370 // max_stack, locals and length are smaller in pre-version 45.2 classes
1371 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1372 }
1373 calculated_attribute_length +=
1374 code_length +
1375 sizeof(exception_table_length) +
1376 sizeof(code_attributes_count) +
1377 exception_table_length *
1378 ( sizeof(u2) + // start_pc
1379 sizeof(u2) + // end_pc
1380 sizeof(u2) + // handler_pc
1381 sizeof(u2) ); // catch_type_index
1382
1383 while (code_attributes_count--) {
1384 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1385 u2 code_attribute_name_index = cfs->get_u2_fast();
1386 u4 code_attribute_length = cfs->get_u4_fast();
1387 calculated_attribute_length += code_attribute_length +
1388 sizeof(code_attribute_name_index) +
1389 sizeof(code_attribute_length);
1390 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1391 cp->tag_at(code_attribute_name_index).is_utf8(),
1392 "Invalid code attribute name index %u in class file %s",
1393 code_attribute_name_index,
1394 CHECK_(nullHandle));
1395 if (LoadLineNumberTables &&
1396 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1397 // Parse and compress line number table
1398 parse_linenumber_table(code_attribute_length, code_length,
1399 &linenumber_table, CHECK_(nullHandle));
1400
1401 } else if (LoadLocalVariableTables &&
1402 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1403 // Parse local variable table
1404 if (!lvt_allocated) {
1405 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1406 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1407 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1408 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1409 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1410 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1411 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1412 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1413 lvt_allocated = true;
1414 }
1415 if (lvt_cnt == max_lvt_cnt) {
1416 max_lvt_cnt <<= 1;
1417 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1418 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1419 }
1420 localvariable_table_start[lvt_cnt] =
1421 parse_localvariable_table(code_length,
1422 max_locals,
1423 code_attribute_length,
1424 cp,
1425 &localvariable_table_length[lvt_cnt],
1426 false, // is not LVTT
1427 CHECK_(nullHandle));
1428 total_lvt_length += localvariable_table_length[lvt_cnt];
1429 lvt_cnt++;
1430 } else if (LoadLocalVariableTypeTables &&
1431 _major_version >= JAVA_1_5_VERSION &&
1432 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1433 if (!lvt_allocated) {
1434 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1435 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1436 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1437 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1438 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1439 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1440 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1441 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1442 lvt_allocated = true;
1443 }
1444 // Parse local variable type table
1445 if (lvtt_cnt == max_lvtt_cnt) {
1446 max_lvtt_cnt <<= 1;
1447 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1448 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1449 }
1450 localvariable_type_table_start[lvtt_cnt] =
1451 parse_localvariable_table(code_length,
1452 max_locals,
1453 code_attribute_length,
1454 cp,
1455 &localvariable_type_table_length[lvtt_cnt],
1456 true, // is LVTT
1457 CHECK_(nullHandle));
1458 lvtt_cnt++;
1459 } else if (UseSplitVerifier &&
1460 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1461 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1462 // Stack map is only needed by the new verifier in JDK1.5.
1463 if (parsed_stackmap_attribute) {
1464 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1465 }
1466 typeArrayOop sm =
1467 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1468 stackmap_data = typeArrayHandle(THREAD, sm);
1469 parsed_stackmap_attribute = true;
1470 } else {
1471 // Skip unknown attributes
1472 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1473 }
1474 }
1475 // check method attribute length
1476 if (_need_verify) {
1477 guarantee_property(method_attribute_length == calculated_attribute_length,
1478 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1479 }
1480 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1481 // Parse Exceptions attribute
1482 if (parsed_checked_exceptions_attribute) {
1483 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1484 }
1485 parsed_checked_exceptions_attribute = true;
1486 checked_exceptions_start =
1487 parse_checked_exceptions(&checked_exceptions_length,
1488 method_attribute_length,
1489 cp, CHECK_(nullHandle));
1490 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1491 if (method_attribute_length != 0) {
1492 classfile_parse_error(
1493 "Invalid Synthetic method attribute length %u in class file %s",
1494 method_attribute_length, CHECK_(nullHandle));
1495 }
1496 // Should we check that there hasn't already been a synthetic attribute?
1497 access_flags.set_is_synthetic();
1498 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1499 if (method_attribute_length != 0) {
1500 classfile_parse_error(
1501 "Invalid Deprecated method attribute length %u in class file %s",
1502 method_attribute_length, CHECK_(nullHandle));
1503 }
1504 } else if (_major_version >= JAVA_1_5_VERSION) {
1505 if (method_attribute_name == vmSymbols::tag_signature()) {
1506 if (method_attribute_length != 2) {
1507 classfile_parse_error(
1508 "Invalid Signature attribute length %u in class file %s",
1509 method_attribute_length, CHECK_(nullHandle));
1510 }
1511 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1512 generic_signature_index = cfs->get_u2_fast();
1513 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1514 runtime_visible_annotations_length = method_attribute_length;
1515 runtime_visible_annotations = cfs->get_u1_buffer();
1516 assert(runtime_visible_annotations != NULL, "null visible annotations");
1517 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1518 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1519 runtime_invisible_annotations_length = method_attribute_length;
1520 runtime_invisible_annotations = cfs->get_u1_buffer();
1521 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1522 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1523 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1524 runtime_visible_parameter_annotations_length = method_attribute_length;
1525 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1526 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1527 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1528 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1529 runtime_invisible_parameter_annotations_length = method_attribute_length;
1530 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1531 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1532 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1533 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1534 annotation_default_length = method_attribute_length;
1535 annotation_default = cfs->get_u1_buffer();
1536 assert(annotation_default != NULL, "null annotation default");
1537 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1538 } else {
1539 // Skip unknown attributes
1540 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1541 }
1542 } else {
1543 // Skip unknown attributes
1544 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1545 }
1546 }
1547
1548 if (linenumber_table != NULL) {
1549 linenumber_table->write_terminator();
1550 linenumber_table_length = linenumber_table->position();
1551 }
1552
1553 // Make sure there's at least one Code attribute in non-native/non-abstract method
1554 if (_need_verify) {
1555 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1556 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1557 }
1558
1559 // All sizing information for a methodOop is finally available, now create it
1560 methodOop m_oop = oopFactory::new_method(
1561 code_length, access_flags, linenumber_table_length,
1562 total_lvt_length, checked_exceptions_length, CHECK_(nullHandle));
1563 methodHandle m (THREAD, m_oop);
1564
1565 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1566
1567 // Fill in information from fixed part (access_flags already set)
1568 m->set_constants(cp());
1569 m->set_name_index(name_index);
1570 m->set_signature_index(signature_index);
1571 m->set_generic_signature_index(generic_signature_index);
1572 #ifdef CC_INTERP
1573 // hmm is there a gc issue here??
1574 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1575 m->set_result_index(rtf.type());
1576 #endif
1577
1578 if (args_size >= 0) {
1579 m->set_size_of_parameters(args_size);
1580 } else {
1581 m->compute_size_of_parameters(THREAD);
1582 }
1583 #ifdef ASSERT
1584 if (args_size >= 0) {
1585 m->compute_size_of_parameters(THREAD);
1586 assert(args_size == m->size_of_parameters(), "");
1587 }
1588 #endif
1589
1590 // Fill in code attribute information
1591 m->set_max_stack(max_stack);
1592 m->set_max_locals(max_locals);
1593 m->constMethod()->set_stackmap_data(stackmap_data());
1594
1595 /**
1596 * The exception_table field is the flag used to indicate
1597 * that the methodOop and it's associated constMethodOop are partially
1598 * initialized and thus are exempt from pre/post GC verification. Once
1599 * the field is set, the oops are considered fully initialized so make
1600 * sure that the oops can pass verification when this field is set.
1601 */
1602 m->set_exception_table(exception_handlers());
1603
1604 // Copy byte codes
1605 if (code_length > 0) {
1606 memcpy(m->code_base(), code_start, code_length);
1607 }
1608
1609 // Copy line number table
1610 if (linenumber_table != NULL) {
1611 memcpy(m->compressed_linenumber_table(),
1612 linenumber_table->buffer(), linenumber_table_length);
1613 }
1614
1615 // Copy checked exceptions
1616 if (checked_exceptions_length > 0) {
1617 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1618 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1619 }
1620
1621 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1622 *
1623 * Rules for LVT's and LVTT's are:
1624 * - There can be any number of LVT's and LVTT's.
1625 * - If there are n LVT's, it is the same as if there was just
1626 * one LVT containing all the entries from the n LVT's.
1627 * - There may be no more than one LVT entry per local variable.
1628 * Two LVT entries are 'equal' if these fields are the same:
1629 * start_pc, length, name, slot
1630 * - There may be no more than one LVTT entry per each LVT entry.
1631 * Each LVTT entry has to match some LVT entry.
1632 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1633 */
1634 if (total_lvt_length > 0) {
1635 int tbl_no, idx;
1636
1637 promoted_flags->set_has_localvariable_table();
1638
1639 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1640 initialize_hashtable(lvt_Hash);
1641
1642 // To fill LocalVariableTable in
1643 Classfile_LVT_Element* cf_lvt;
1644 LocalVariableTableElement* lvt = m->localvariable_table_start();
1645
1646 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1647 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1648 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1649 copy_lvt_element(&cf_lvt[idx], lvt);
1650 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1651 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1652 && _need_verify
1653 && _major_version >= JAVA_1_5_VERSION ) {
1654 clear_hashtable(lvt_Hash);
1655 classfile_parse_error("Duplicated LocalVariableTable attribute "
1656 "entry for '%s' in class file %s",
1657 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1658 CHECK_(nullHandle));
1659 }
1660 }
1661 }
1662
1663 // To merge LocalVariableTable and LocalVariableTypeTable
1664 Classfile_LVT_Element* cf_lvtt;
1665 LocalVariableTableElement lvtt_elem;
1666
1667 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1668 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1669 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1670 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1671 int index = hash(&lvtt_elem);
1672 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1673 if (entry == NULL) {
1674 if (_need_verify) {
1675 clear_hashtable(lvt_Hash);
1676 classfile_parse_error("LVTT entry for '%s' in class file %s "
1677 "does not match any LVT entry",
1678 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1679 CHECK_(nullHandle));
1680 }
1681 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1682 clear_hashtable(lvt_Hash);
1683 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1684 "entry for '%s' in class file %s",
1685 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1686 CHECK_(nullHandle));
1687 } else {
1688 // to add generic signatures into LocalVariableTable
1689 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1690 }
1691 }
1692 }
1693 clear_hashtable(lvt_Hash);
1694 }
1695
1696 *method_annotations = assemble_annotations(runtime_visible_annotations,
1697 runtime_visible_annotations_length,
1698 runtime_invisible_annotations,
1699 runtime_invisible_annotations_length,
1700 CHECK_(nullHandle));
1701 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1702 runtime_visible_parameter_annotations_length,
1703 runtime_invisible_parameter_annotations,
1704 runtime_invisible_parameter_annotations_length,
1705 CHECK_(nullHandle));
1706 *method_default_annotations = assemble_annotations(annotation_default,
1707 annotation_default_length,
1708 NULL,
1709 0,
1710 CHECK_(nullHandle));
1711
1712 if (name() == vmSymbols::finalize_method_name() &&
1713 signature() == vmSymbols::void_method_signature()) {
1714 if (m->is_empty_method()) {
1715 _has_empty_finalizer = true;
1716 } else {
1717 _has_finalizer = true;
1718 }
1719 }
1720 if (name() == vmSymbols::object_initializer_name() &&
1721 signature() == vmSymbols::void_method_signature() &&
1722 m->is_vanilla_constructor()) {
1723 _has_vanilla_constructor = true;
1724 }
1725
1726 return m;
1727 }
1728
1729
1730 // The promoted_flags parameter is used to pass relevant access_flags
1731 // from the methods back up to the containing klass. These flag values
1732 // are added to klass's access_flags.
1733
1734 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1735 AccessFlags* promoted_flags,
1736 bool* has_final_method,
1737 objArrayOop* methods_annotations_oop,
1738 objArrayOop* methods_parameter_annotations_oop,
1739 objArrayOop* methods_default_annotations_oop,
1740 TRAPS) {
1741 ClassFileStream* cfs = stream();
1742 objArrayHandle nullHandle;
1743 typeArrayHandle method_annotations;
1744 typeArrayHandle method_parameter_annotations;
1745 typeArrayHandle method_default_annotations;
1746 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1747 u2 length = cfs->get_u2_fast();
1748 if (length == 0) {
1749 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1750 } else {
1751 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1752 objArrayHandle methods(THREAD, m);
1753 HandleMark hm(THREAD);
1754 objArrayHandle methods_annotations;
1755 objArrayHandle methods_parameter_annotations;
1756 objArrayHandle methods_default_annotations;
1757 for (int index = 0; index < length; index++) {
1758 methodHandle method = parse_method(cp, is_interface,
1759 promoted_flags,
1760 &method_annotations,
1761 &method_parameter_annotations,
1762 &method_default_annotations,
1763 CHECK_(nullHandle));
1764 if (method->is_final()) {
1765 *has_final_method = true;
1766 }
1767 methods->obj_at_put(index, method());
1768 if (method_annotations.not_null()) {
1769 if (methods_annotations.is_null()) {
1770 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1771 methods_annotations = objArrayHandle(THREAD, md);
1772 }
1773 methods_annotations->obj_at_put(index, method_annotations());
1774 }
1775 if (method_parameter_annotations.not_null()) {
1776 if (methods_parameter_annotations.is_null()) {
1777 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1778 methods_parameter_annotations = objArrayHandle(THREAD, md);
1779 }
1780 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1781 }
1782 if (method_default_annotations.not_null()) {
1783 if (methods_default_annotations.is_null()) {
1784 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1785 methods_default_annotations = objArrayHandle(THREAD, md);
1786 }
1787 methods_default_annotations->obj_at_put(index, method_default_annotations());
1788 }
1789 }
1790 if (_need_verify && length > 1) {
1791 // Check duplicated methods
1792 ResourceMark rm(THREAD);
1793 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1794 THREAD, NameSigHash*, HASH_ROW_SIZE);
1795 initialize_hashtable(names_and_sigs);
1796 bool dup = false;
1797 {
1798 debug_only(No_Safepoint_Verifier nsv;)
1799 for (int i = 0; i < length; i++) {
1800 methodOop m = (methodOop)methods->obj_at(i);
1801 // If no duplicates, add name/signature in hashtable names_and_sigs.
1802 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1803 dup = true;
1804 break;
1805 }
1806 }
1807 }
1808 if (dup) {
1809 classfile_parse_error("Duplicate method name&signature in class file %s",
1810 CHECK_(nullHandle));
1811 }
1812 }
1813
1814 *methods_annotations_oop = methods_annotations();
1815 *methods_parameter_annotations_oop = methods_parameter_annotations();
1816 *methods_default_annotations_oop = methods_default_annotations();
1817
1818 return methods;
1819 }
1820 }
1821
1822
1823 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1824 objArrayHandle methods_annotations,
1825 objArrayHandle methods_parameter_annotations,
1826 objArrayHandle methods_default_annotations,
1827 TRAPS) {
1828 typeArrayHandle nullHandle;
1829 int length = methods()->length();
1830 // If JVMTI original method ordering is enabled we have to
1831 // remember the original class file ordering.
1832 // We temporarily use the vtable_index field in the methodOop to store the
1833 // class file index, so we can read in after calling qsort.
1834 if (JvmtiExport::can_maintain_original_method_order()) {
1835 for (int index = 0; index < length; index++) {
1836 methodOop m = methodOop(methods->obj_at(index));
1837 assert(!m->valid_vtable_index(), "vtable index should not be set");
1838 m->set_vtable_index(index);
1839 }
1840 }
1841 // Sort method array by ascending method name (for faster lookups & vtable construction)
1842 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1843 methodOopDesc::sort_methods(methods(),
1844 methods_annotations(),
1845 methods_parameter_annotations(),
1846 methods_default_annotations());
1847
1848 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1849 if (JvmtiExport::can_maintain_original_method_order()) {
1850 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1851 typeArrayHandle method_ordering(THREAD, new_ordering);
1852 for (int index = 0; index < length; index++) {
1853 methodOop m = methodOop(methods->obj_at(index));
1854 int old_index = m->vtable_index();
1855 assert(old_index >= 0 && old_index < length, "invalid method index");
1856 method_ordering->int_at_put(index, old_index);
1857 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1858 }
1859 return method_ordering;
1860 } else {
1861 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1862 }
1863 }
1864
1865
1866 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1867 ClassFileStream* cfs = stream();
1868 cfs->guarantee_more(2, CHECK); // sourcefile_index
1869 u2 sourcefile_index = cfs->get_u2_fast();
1870 check_property(
1871 valid_cp_range(sourcefile_index, cp->length()) &&
1872 cp->tag_at(sourcefile_index).is_utf8(),
1873 "Invalid SourceFile attribute at constant pool index %u in class file %s",
1874 sourcefile_index, CHECK);
1875 k->set_source_file_name(cp->symbol_at(sourcefile_index));
1876 }
1877
1878
1879
1880 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
1881 instanceKlassHandle k,
1882 int length, TRAPS) {
1883 ClassFileStream* cfs = stream();
1884 u1* sde_buffer = cfs->get_u1_buffer();
1885 assert(sde_buffer != NULL, "null sde buffer");
1886
1887 // Don't bother storing it if there is no way to retrieve it
1888 if (JvmtiExport::can_get_source_debug_extension()) {
1889 // Optimistically assume that only 1 byte UTF format is used
1890 // (common case)
1891 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
1892 length, CHECK);
1893 k->set_source_debug_extension(sde_symbol);
1894 }
1895 // Got utf8 string, set stream position forward
1896 cfs->skip_u1(length, CHECK);
1897 }
1898
1899
1900 // Inner classes can be static, private or protected (classic VM does this)
1901 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
1902
1903 // Return number of classes in the inner classes attribute table
1904 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1905 ClassFileStream* cfs = stream();
1906 cfs->guarantee_more(2, CHECK_0); // length
1907 u2 length = cfs->get_u2_fast();
1908
1909 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
1910 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
1911 typeArrayHandle inner_classes(THREAD, ic);
1912 int index = 0;
1913 int cp_size = cp->length();
1914 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
1915 for (int n = 0; n < length; n++) {
1916 // Inner class index
1917 u2 inner_class_info_index = cfs->get_u2_fast();
1918 check_property(
1919 inner_class_info_index == 0 ||
1920 (valid_cp_range(inner_class_info_index, cp_size) &&
1921 cp->tag_at(inner_class_info_index).is_klass_reference()),
1922 "inner_class_info_index %u has bad constant type in class file %s",
1923 inner_class_info_index, CHECK_0);
1924 // Outer class index
1925 u2 outer_class_info_index = cfs->get_u2_fast();
1926 check_property(
1927 outer_class_info_index == 0 ||
1928 (valid_cp_range(outer_class_info_index, cp_size) &&
1929 cp->tag_at(outer_class_info_index).is_klass_reference()),
1930 "outer_class_info_index %u has bad constant type in class file %s",
1931 outer_class_info_index, CHECK_0);
1932 // Inner class name
1933 u2 inner_name_index = cfs->get_u2_fast();
1934 check_property(
1935 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
1936 cp->tag_at(inner_name_index).is_utf8()),
1937 "inner_name_index %u has bad constant type in class file %s",
1938 inner_name_index, CHECK_0);
1939 if (_need_verify) {
1940 guarantee_property(inner_class_info_index != outer_class_info_index,
1941 "Class is both outer and inner class in class file %s", CHECK_0);
1942 }
1943 // Access flags
1944 AccessFlags inner_access_flags;
1945 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
1946 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
1947 // Set abstract bit for old class files for backward compatibility
1948 flags |= JVM_ACC_ABSTRACT;
1949 }
1950 verify_legal_class_modifiers(flags, CHECK_0);
1951 inner_access_flags.set_flags(flags);
1952
1953 inner_classes->short_at_put(index++, inner_class_info_index);
1954 inner_classes->short_at_put(index++, outer_class_info_index);
1955 inner_classes->short_at_put(index++, inner_name_index);
1956 inner_classes->short_at_put(index++, inner_access_flags.as_short());
1957 }
1958
1959 // 4347400: make sure there's no duplicate entry in the classes array
1960 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
1961 for(int i = 0; i < inner_classes->length(); i += 4) {
1962 for(int j = i + 4; j < inner_classes->length(); j += 4) {
1963 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
1964 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
1965 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
1966 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
1967 "Duplicate entry in InnerClasses in class file %s",
1968 CHECK_0);
1969 }
1970 }
1971 }
1972
1973 // Update instanceKlass with inner class info.
1974 k->set_inner_classes(inner_classes());
1975 return length;
1976 }
1977
1978 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1979 k->set_is_synthetic();
1980 }
1981
1982 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1983 ClassFileStream* cfs = stream();
1984 u2 signature_index = cfs->get_u2(CHECK);
1985 check_property(
1986 valid_cp_range(signature_index, cp->length()) &&
1987 cp->tag_at(signature_index).is_utf8(),
1988 "Invalid constant pool index %u in Signature attribute in class file %s",
1989 signature_index, CHECK);
1990 k->set_generic_signature(cp->symbol_at(signature_index));
1991 }
1992
1993 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1994 ClassFileStream* cfs = stream();
1995 // Set inner classes attribute to default sentinel
1996 k->set_inner_classes(Universe::the_empty_short_array());
1997 cfs->guarantee_more(2, CHECK); // attributes_count
1998 u2 attributes_count = cfs->get_u2_fast();
1999 bool parsed_sourcefile_attribute = false;
2000 bool parsed_innerclasses_attribute = false;
2001 bool parsed_enclosingmethod_attribute = false;
2002 u1* runtime_visible_annotations = NULL;
2003 int runtime_visible_annotations_length = 0;
2004 u1* runtime_invisible_annotations = NULL;
2005 int runtime_invisible_annotations_length = 0;
2006 // Iterate over attributes
2007 while (attributes_count--) {
2008 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2009 u2 attribute_name_index = cfs->get_u2_fast();
2010 u4 attribute_length = cfs->get_u4_fast();
2011 check_property(
2012 valid_cp_range(attribute_name_index, cp->length()) &&
2013 cp->tag_at(attribute_name_index).is_utf8(),
2014 "Attribute name has bad constant pool index %u in class file %s",
2015 attribute_name_index, CHECK);
2016 symbolOop tag = cp->symbol_at(attribute_name_index);
2017 if (tag == vmSymbols::tag_source_file()) {
2018 // Check for SourceFile tag
2019 if (_need_verify) {
2020 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2021 }
2022 if (parsed_sourcefile_attribute) {
2023 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2024 } else {
2025 parsed_sourcefile_attribute = true;
2026 }
2027 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2028 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2029 // Check for SourceDebugExtension tag
2030 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2031 } else if (tag == vmSymbols::tag_inner_classes()) {
2032 // Check for InnerClasses tag
2033 if (parsed_innerclasses_attribute) {
2034 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2035 } else {
2036 parsed_innerclasses_attribute = true;
2037 }
2038 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2039 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2040 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2041 "Wrong InnerClasses attribute length in class file %s", CHECK);
2042 }
2043 } else if (tag == vmSymbols::tag_synthetic()) {
2044 // Check for Synthetic tag
2045 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2046 if (attribute_length != 0) {
2047 classfile_parse_error(
2048 "Invalid Synthetic classfile attribute length %u in class file %s",
2049 attribute_length, CHECK);
2050 }
2051 parse_classfile_synthetic_attribute(cp, k, CHECK);
2052 } else if (tag == vmSymbols::tag_deprecated()) {
2053 // Check for Deprecatd tag - 4276120
2054 if (attribute_length != 0) {
2055 classfile_parse_error(
2056 "Invalid Deprecated classfile attribute length %u in class file %s",
2057 attribute_length, CHECK);
2058 }
2059 } else if (_major_version >= JAVA_1_5_VERSION) {
2060 if (tag == vmSymbols::tag_signature()) {
2061 if (attribute_length != 2) {
2062 classfile_parse_error(
2063 "Wrong Signature attribute length %u in class file %s",
2064 attribute_length, CHECK);
2065 }
2066 parse_classfile_signature_attribute(cp, k, CHECK);
2067 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2068 runtime_visible_annotations_length = attribute_length;
2069 runtime_visible_annotations = cfs->get_u1_buffer();
2070 assert(runtime_visible_annotations != NULL, "null visible annotations");
2071 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2072 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2073 runtime_invisible_annotations_length = attribute_length;
2074 runtime_invisible_annotations = cfs->get_u1_buffer();
2075 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2076 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2077 } else if (tag == vmSymbols::tag_enclosing_method()) {
2078 if (parsed_enclosingmethod_attribute) {
2079 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2080 } else {
2081 parsed_enclosingmethod_attribute = true;
2082 }
2083 cfs->guarantee_more(4, CHECK); // class_index, method_index
2084 u2 class_index = cfs->get_u2_fast();
2085 u2 method_index = cfs->get_u2_fast();
2086 if (class_index == 0) {
2087 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2088 }
2089 // Validate the constant pool indices and types
2090 if (!cp->is_within_bounds(class_index) ||
2091 !cp->tag_at(class_index).is_klass_reference()) {
2092 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2093 }
2094 if (method_index != 0 &&
2095 (!cp->is_within_bounds(method_index) ||
2096 !cp->tag_at(method_index).is_name_and_type())) {
2097 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2098 }
2099 k->set_enclosing_method_indices(class_index, method_index);
2100 } else {
2101 // Unknown attribute
2102 cfs->skip_u1(attribute_length, CHECK);
2103 }
2104 } else {
2105 // Unknown attribute
2106 cfs->skip_u1(attribute_length, CHECK);
2107 }
2108 }
2109 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2110 runtime_visible_annotations_length,
2111 runtime_invisible_annotations,
2112 runtime_invisible_annotations_length,
2113 CHECK);
2114 k->set_class_annotations(annotations());
2115 }
2116
2117
2118 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2119 int runtime_visible_annotations_length,
2120 u1* runtime_invisible_annotations,
2121 int runtime_invisible_annotations_length, TRAPS) {
2122 typeArrayHandle annotations;
2123 if (runtime_visible_annotations != NULL ||
2124 runtime_invisible_annotations != NULL) {
2125 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2126 runtime_invisible_annotations_length, CHECK_(annotations));
2127 annotations = typeArrayHandle(THREAD, anno);
2128 if (runtime_visible_annotations != NULL) {
2129 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2130 }
2131 if (runtime_invisible_annotations != NULL) {
2132 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2133 }
2134 }
2135 return annotations;
2136 }
2137
2138
2139 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2140 KlassHandle h_k (THREAD, fd->field_holder());
2141 assert(h_k.not_null() && fd->is_static(), "just checking");
2142 if (fd->has_initial_value()) {
2143 BasicType t = fd->field_type();
2144 switch (t) {
2145 case T_BYTE:
2146 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2147 break;
2148 case T_BOOLEAN:
2149 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2150 break;
2151 case T_CHAR:
2152 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2153 break;
2154 case T_SHORT:
2155 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2156 break;
2157 case T_INT:
2158 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2159 break;
2160 case T_FLOAT:
2161 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2162 break;
2163 case T_DOUBLE:
2164 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2165 break;
2166 case T_LONG:
2167 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2168 break;
2169 case T_OBJECT:
2170 {
2171 #ifdef ASSERT
2172 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2173 assert(fd->signature() == sym, "just checking");
2174 #endif
2175 oop string = fd->string_initial_value(CHECK);
2176 h_k()->obj_field_put(fd->offset(), string);
2177 }
2178 break;
2179 default:
2180 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2181 "Illegal ConstantValue attribute in class file");
2182 }
2183 }
2184 }
2185
2186
2187 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2188 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2189 // This code is for compatibility with earlier jdk's that do not
2190 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2191 // the check for the "discovered" field should issue a warning if
2192 // the field is not found. For 1.6 this code should be issue a
2193 // fatal error if the "discovered" field is not found.
2194 //
2195 // Increment fac.nonstatic_oop_count so that the start of the
2196 // next type of non-static oops leaves room for the fake oop.
2197 // Do not increment next_nonstatic_oop_offset so that the
2198 // fake oop is place after the java.lang.ref.Reference oop
2199 // fields.
2200 //
2201 // Check the fields in java.lang.ref.Reference for the "discovered"
2202 // field. If it is not present, artifically create a field for it.
2203 // This allows this VM to run on early JDK where the field is not
2204 // present.
2205
2206 //
2207 // Increment fac.nonstatic_oop_count so that the start of the
2208 // next type of non-static oops leaves room for the fake oop.
2209 // Do not increment next_nonstatic_oop_offset so that the
2210 // fake oop is place after the java.lang.ref.Reference oop
2211 // fields.
2212 //
2213 // Check the fields in java.lang.ref.Reference for the "discovered"
2214 // field. If it is not present, artifically create a field for it.
2215 // This allows this VM to run on early JDK where the field is not
2216 // present.
2217 int reference_sig_index = 0;
2218 int reference_name_index = 0;
2219 int reference_index = 0;
2220 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2221 const int n = (*fields_ptr)()->length();
2222 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2223 int name_index =
2224 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2225 int sig_index =
2226 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2227 symbolOop f_name = cp->symbol_at(name_index);
2228 symbolOop f_sig = cp->symbol_at(sig_index);
2229 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2230 // Save the index for reference signature for later use.
2231 // The fake discovered field does not entries in the
2232 // constant pool so the index for its signature cannot
2233 // be extracted from the constant pool. It will need
2234 // later, however. It's signature is vmSymbols::reference_signature()
2235 // so same an index for that signature.
2236 reference_sig_index = sig_index;
2237 reference_name_index = name_index;
2238 reference_index = i;
2239 }
2240 if (f_name == vmSymbols::reference_discovered_name() &&
2241 f_sig == vmSymbols::reference_signature()) {
2242 // The values below are fake but will force extra
2243 // non-static oop fields and a corresponding non-static
2244 // oop map block to be allocated.
2245 extra = 0;
2246 break;
2247 }
2248 }
2249 if (extra != 0) {
2250 fac_ptr->nonstatic_oop_count += extra;
2251 // Add the additional entry to "fields" so that the klass
2252 // contains the "discoverd" field and the field will be initialized
2253 // in instances of the object.
2254 int fields_with_fix_length = (*fields_ptr)()->length() +
2255 instanceKlass::next_offset;
2256 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2257 fields_with_fix_length, CHECK);
2258 typeArrayHandle fields_with_fix(THREAD, ff);
2259
2260 // Take everything from the original but the length.
2261 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2262 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2263 }
2264
2265 // Add the fake field at the end.
2266 int i = (*fields_ptr)->length();
2267 // There is no name index for the fake "discovered" field nor
2268 // signature but a signature is needed so that the field will
2269 // be properly initialized. Use one found for
2270 // one of the other reference fields. Be sure the index for the
2271 // name is 0. In fieldDescriptor::initialize() the index of the
2272 // name is checked. That check is by passed for the last nonstatic
2273 // oop field in a java.lang.ref.Reference which is assumed to be
2274 // this artificial "discovered" field. An assertion checks that
2275 // the name index is 0.
2276 assert(reference_index != 0, "Missing signature for reference");
2277
2278 int j;
2279 for (j = 0; j < instanceKlass::next_offset; j++) {
2280 fields_with_fix->ushort_at_put(i + j,
2281 (*fields_ptr)->ushort_at(reference_index +j));
2282 }
2283 // Clear the public access flag and set the private access flag.
2284 short flags;
2285 flags =
2286 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2287 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2288 flags = flags & (~JVM_ACC_PUBLIC);
2289 flags = flags | JVM_ACC_PRIVATE;
2290 AccessFlags access_flags;
2291 access_flags.set_flags(flags);
2292 assert(!access_flags.is_public(), "Failed to clear public flag");
2293 assert(access_flags.is_private(), "Failed to set private flag");
2294 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2295 flags);
2296
2297 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2298 == reference_name_index, "The fake reference name is incorrect");
2299 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2300 == reference_sig_index, "The fake reference signature is incorrect");
2301 // The type of the field is stored in the low_offset entry during
2302 // parsing.
2303 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2304 NONSTATIC_OOP, "The fake reference type is incorrect");
2305
2306 // "fields" is allocated in the permanent generation. Disgard
2307 // it and let it be collected.
2308 (*fields_ptr) = fields_with_fix;
2309 }
2310 return;
2311 }
2312
2313
2314 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2315 FieldAllocationCount *fac_ptr, TRAPS) {
2316 // Add fake fields for java.lang.Class instances
2317 //
2318 // This is not particularly nice. We should consider adding a
2319 // private transient object field at the Java level to
2320 // java.lang.Class. Alternatively we could add a subclass of
2321 // instanceKlass which provides an accessor and size computer for
2322 // this field, but that appears to be more code than this hack.
2323 //
2324 // NOTE that we wedge these in at the beginning rather than the
2325 // end of the object because the Class layout changed between JDK
2326 // 1.3 and JDK 1.4 with the new reflection implementation; some
2327 // nonstatic oop fields were added at the Java level. The offsets
2328 // of these fake fields can't change between these two JDK
2329 // versions because when the offsets are computed at bootstrap
2330 // time we don't know yet which version of the JDK we're running in.
2331
2332 // The values below are fake but will force two non-static oop fields and
2333 // a corresponding non-static oop map block to be allocated.
2334 const int extra = java_lang_Class::number_of_fake_oop_fields;
2335 fac_ptr->nonstatic_oop_count += extra;
2336 }
2337
2338
2339 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2340 // Cause the extra fake fields in java.lang.Class to show up before
2341 // the Java fields for layout compatibility between 1.3 and 1.4
2342 // Incrementing next_nonstatic_oop_offset here advances the
2343 // location where the real java fields are placed.
2344 const int extra = java_lang_Class::number_of_fake_oop_fields;
2345 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2346 }
2347
2348
2349 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2350 Handle class_loader,
2351 Handle protection_domain,
2352 symbolHandle& parsed_name,
2353 TRAPS) {
2354 // So that JVMTI can cache class file in the state before retransformable agents
2355 // have modified it
2356 unsigned char *cached_class_file_bytes = NULL;
2357 jint cached_class_file_length;
2358
2359 ClassFileStream* cfs = stream();
2360 // Timing
2361 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time());
2362
2363 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2364
2365 if (JvmtiExport::should_post_class_file_load_hook()) {
2366 unsigned char* ptr = cfs->buffer();
2367 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2368
2369 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2370 &ptr, &end_ptr,
2371 &cached_class_file_bytes,
2372 &cached_class_file_length);
2373
2374 if (ptr != cfs->buffer()) {
2375 // JVMTI agent has modified class file data.
2376 // Set new class file stream using JVMTI agent modified
2377 // class file data.
2378 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2379 set_stream(cfs);
2380 }
2381 }
2382
2383
2384 instanceKlassHandle nullHandle;
2385
2386 // Figure out whether we can skip format checking (matching classic VM behavior)
2387 _need_verify = Verifier::should_verify_for(class_loader());
2388
2389 // Set the verify flag in stream
2390 cfs->set_verify(_need_verify);
2391
2392 // Save the class file name for easier error message printing.
2393 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2394
2395 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2396 // Magic value
2397 u4 magic = cfs->get_u4_fast();
2398 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2399 "Incompatible magic value %u in class file %s",
2400 magic, CHECK_(nullHandle));
2401
2402 // Version numbers
2403 u2 minor_version = cfs->get_u2_fast();
2404 u2 major_version = cfs->get_u2_fast();
2405
2406 // Check version numbers - we check this even with verifier off
2407 if (!is_supported_version(major_version, minor_version)) {
2408 if (name.is_null()) {
2409 Exceptions::fthrow(
2410 THREAD_AND_LOCATION,
2411 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2412 "Unsupported major.minor version %u.%u",
2413 major_version,
2414 minor_version);
2415 } else {
2416 ResourceMark rm(THREAD);
2417 Exceptions::fthrow(
2418 THREAD_AND_LOCATION,
2419 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2420 "%s : Unsupported major.minor version %u.%u",
2421 name->as_C_string(),
2422 major_version,
2423 minor_version);
2424 }
2425 return nullHandle;
2426 }
2427
2428 _major_version = major_version;
2429 _minor_version = minor_version;
2430
2431
2432 // Check if verification needs to be relaxed for this class file
2433 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2434 _relax_verify = Verifier::relax_verify_for(class_loader());
2435
2436 // Constant pool
2437 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2438 int cp_size = cp->length();
2439
2440 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2441
2442 // Access flags
2443 AccessFlags access_flags;
2444 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2445
2446 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2447 // Set abstract bit for old class files for backward compatibility
2448 flags |= JVM_ACC_ABSTRACT;
2449 }
2450 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2451 access_flags.set_flags(flags);
2452
2453 // This class and superclass
2454 instanceKlassHandle super_klass;
2455 u2 this_class_index = cfs->get_u2_fast();
2456 check_property(
2457 valid_cp_range(this_class_index, cp_size) &&
2458 cp->tag_at(this_class_index).is_unresolved_klass(),
2459 "Invalid this class index %u in constant pool in class file %s",
2460 this_class_index, CHECK_(nullHandle));
2461
2462 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2463 assert(class_name.not_null(), "class_name can't be null");
2464
2465 // It's important to set parsed_name *before* resolving the super class.
2466 // (it's used for cleanup by the caller if parsing fails)
2467 parsed_name = class_name;
2468
2469 // Update _class_name which could be null previously to be class_name
2470 _class_name = class_name;
2471
2472 // Don't need to check whether this class name is legal or not.
2473 // It has been checked when constant pool is parsed.
2474 // However, make sure it is not an array type.
2475 if (_need_verify) {
2476 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2477 "Bad class name in class file %s",
2478 CHECK_(nullHandle));
2479 }
2480
2481 klassOop preserve_this_klass; // for storing result across HandleMark
2482
2483 // release all handles when parsing is done
2484 { HandleMark hm(THREAD);
2485
2486 // Checks if name in class file matches requested name
2487 if (name.not_null() && class_name() != name()) {
2488 ResourceMark rm(THREAD);
2489 Exceptions::fthrow(
2490 THREAD_AND_LOCATION,
2491 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2492 "%s (wrong name: %s)",
2493 name->as_C_string(),
2494 class_name->as_C_string()
2495 );
2496 return nullHandle;
2497 }
2498
2499 if (TraceClassLoadingPreorder) {
2500 tty->print("[Loading %s", name()->as_klass_external_name());
2501 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2502 tty->print_cr("]");
2503 }
2504
2505 u2 super_class_index = cfs->get_u2_fast();
2506 if (super_class_index == 0) {
2507 check_property(class_name() == vmSymbols::java_lang_Object(),
2508 "Invalid superclass index %u in class file %s",
2509 super_class_index,
2510 CHECK_(nullHandle));
2511 } else {
2512 check_property(valid_cp_range(super_class_index, cp_size) &&
2513 cp->tag_at(super_class_index).is_unresolved_klass(),
2514 "Invalid superclass index %u in class file %s",
2515 super_class_index,
2516 CHECK_(nullHandle));
2517 // The class name should be legal because it is checked when parsing constant pool.
2518 // However, make sure it is not an array type.
2519 if (_need_verify) {
2520 guarantee_property(cp->unresolved_klass_at(super_class_index)->byte_at(0) != JVM_SIGNATURE_ARRAY,
2521 "Bad superclass name in class file %s", CHECK_(nullHandle));
2522 }
2523 }
2524
2525 // Interfaces
2526 u2 itfs_len = cfs->get_u2_fast();
2527 objArrayHandle local_interfaces;
2528 if (itfs_len == 0) {
2529 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2530 } else {
2531 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle));
2532 }
2533
2534 // Fields (offsets are filled in later)
2535 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2536 objArrayHandle fields_annotations;
2537 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2538 // Methods
2539 bool has_final_method = false;
2540 AccessFlags promoted_flags;
2541 promoted_flags.set_flags(0);
2542 // These need to be oop pointers because they are allocated lazily
2543 // inside parse_methods inside a nested HandleMark
2544 objArrayOop methods_annotations_oop = NULL;
2545 objArrayOop methods_parameter_annotations_oop = NULL;
2546 objArrayOop methods_default_annotations_oop = NULL;
2547 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2548 &promoted_flags,
2549 &has_final_method,
2550 &methods_annotations_oop,
2551 &methods_parameter_annotations_oop,
2552 &methods_default_annotations_oop,
2553 CHECK_(nullHandle));
2554
2555 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2556 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2557 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2558
2559 // We check super class after class file is parsed and format is checked
2560 if (super_class_index > 0) {
2561 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2562 if (access_flags.is_interface()) {
2563 // Before attempting to resolve the superclass, check for class format
2564 // errors not checked yet.
2565 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2566 "Interfaces must have java.lang.Object as superclass in class file %s",
2567 CHECK_(nullHandle));
2568 }
2569 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2570 sk,
2571 class_loader,
2572 protection_domain,
2573 true,
2574 CHECK_(nullHandle));
2575 KlassHandle kh (THREAD, k);
2576 super_klass = instanceKlassHandle(THREAD, kh());
2577 if (super_klass->is_interface()) {
2578 ResourceMark rm(THREAD);
2579 Exceptions::fthrow(
2580 THREAD_AND_LOCATION,
2581 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2582 "class %s has interface %s as super class",
2583 class_name->as_klass_external_name(),
2584 super_klass->external_name()
2585 );
2586 return nullHandle;
2587 }
2588 // Make sure super class is not final
2589 if (super_klass->is_final()) {
2590 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2591 }
2592 }
2593
2594 // Compute the transitive list of all unique interfaces implemented by this class
2595 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2596
2597 // sort methods
2598 typeArrayHandle method_ordering = sort_methods(methods,
2599 methods_annotations,
2600 methods_parameter_annotations,
2601 methods_default_annotations,
2602 CHECK_(nullHandle));
2603
2604 // promote flags from parse_methods() to the klass' flags
2605 access_flags.add_promoted_flags(promoted_flags.as_int());
2606
2607 // Size of Java vtable (in words)
2608 int vtable_size = 0;
2609 int itable_size = 0;
2610 int num_miranda_methods = 0;
2611
2612 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2613 num_miranda_methods,
2614 super_klass(),
2615 methods(),
2616 access_flags,
2617 class_loader(),
2618 class_name(),
2619 local_interfaces());
2620
2621 // Size of Java itable (in words)
2622 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2623
2624 // Field size and offset computation
2625 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2626 #ifndef PRODUCT
2627 int orig_nonstatic_field_size = 0;
2628 #endif
2629 int static_field_size = 0;
2630 int next_static_oop_offset;
2631 int next_static_double_offset;
2632 int next_static_word_offset;
2633 int next_static_short_offset;
2634 int next_static_byte_offset;
2635 int next_static_type_offset;
2636 int next_nonstatic_oop_offset;
2637 int next_nonstatic_double_offset;
2638 int next_nonstatic_word_offset;
2639 int next_nonstatic_short_offset;
2640 int next_nonstatic_byte_offset;
2641 int next_nonstatic_type_offset;
2642 int first_nonstatic_oop_offset;
2643 int first_nonstatic_field_offset;
2644 int next_nonstatic_field_offset;
2645
2646 // Calculate the starting byte offsets
2647 next_static_oop_offset = (instanceKlass::header_size() +
2648 align_object_offset(vtable_size) +
2649 align_object_offset(itable_size)) * wordSize;
2650 next_static_double_offset = next_static_oop_offset +
2651 (fac.static_oop_count * heapOopSize);
2652 if ( fac.static_double_count &&
2653 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2654 Universe::field_type_should_be_aligned(T_LONG)) ) {
2655 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2656 }
2657
2658 next_static_word_offset = next_static_double_offset +
2659 (fac.static_double_count * BytesPerLong);
2660 next_static_short_offset = next_static_word_offset +
2661 (fac.static_word_count * BytesPerInt);
2662 next_static_byte_offset = next_static_short_offset +
2663 (fac.static_short_count * BytesPerShort);
2664 next_static_type_offset = align_size_up((next_static_byte_offset +
2665 fac.static_byte_count ), wordSize );
2666 static_field_size = (next_static_type_offset -
2667 next_static_oop_offset) / wordSize;
2668 first_nonstatic_field_offset = (instanceOopDesc::header_size() +
2669 nonstatic_field_size) * wordSize;
2670 next_nonstatic_field_offset = first_nonstatic_field_offset;
2671
2672 // Add fake fields for java.lang.Class instances (also see below)
2673 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2674 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2675 }
2676
2677 // Add a fake "discovered" field if it is not present
2678 // for compatibility with earlier jdk's.
2679 if (class_name() == vmSymbols::java_lang_ref_Reference()
2680 && class_loader.is_null()) {
2681 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2682 }
2683 // end of "discovered" field compactibility fix
2684
2685 int nonstatic_double_count = fac.nonstatic_double_count;
2686 int nonstatic_word_count = fac.nonstatic_word_count;
2687 int nonstatic_short_count = fac.nonstatic_short_count;
2688 int nonstatic_byte_count = fac.nonstatic_byte_count;
2689 int nonstatic_oop_count = fac.nonstatic_oop_count;
2690
2691 bool super_has_nonstatic_fields =
2692 (super_klass() != NULL && super_klass->has_nonstatic_fields());
2693 bool has_nonstatic_fields = super_has_nonstatic_fields ||
2694 ((nonstatic_double_count + nonstatic_word_count +
2695 nonstatic_short_count + nonstatic_byte_count +
2696 nonstatic_oop_count) != 0);
2697
2698
2699 // Prepare list of oops for oop maps generation.
2700 u2* nonstatic_oop_offsets;
2701 u2* nonstatic_oop_length;
2702 int nonstatic_oop_map_count = 0;
2703
2704 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2705 THREAD, u2, nonstatic_oop_count+1);
2706 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2707 THREAD, u2, nonstatic_oop_count+1);
2708
2709 // Add fake fields for java.lang.Class instances (also see above).
2710 // FieldsAllocationStyle and CompactFields values will be reset to default.
2711 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2712 java_lang_Class_fix_post(&next_nonstatic_field_offset);
2713 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset;
2714 int fake_oop_count = (( next_nonstatic_field_offset -
2715 first_nonstatic_field_offset ) / heapOopSize);
2716 nonstatic_oop_length [0] = (u2)fake_oop_count;
2717 nonstatic_oop_map_count = 1;
2718 nonstatic_oop_count -= fake_oop_count;
2719 first_nonstatic_oop_offset = first_nonstatic_field_offset;
2720 } else {
2721 first_nonstatic_oop_offset = 0; // will be set for first oop field
2722 }
2723
2724 #ifndef PRODUCT
2725 if( PrintCompactFieldsSavings ) {
2726 next_nonstatic_double_offset = next_nonstatic_field_offset +
2727 (nonstatic_oop_count * heapOopSize);
2728 if ( nonstatic_double_count > 0 ) {
2729 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2730 }
2731 next_nonstatic_word_offset = next_nonstatic_double_offset +
2732 (nonstatic_double_count * BytesPerLong);
2733 next_nonstatic_short_offset = next_nonstatic_word_offset +
2734 (nonstatic_word_count * BytesPerInt);
2735 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2736 (nonstatic_short_count * BytesPerShort);
2737 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
2738 nonstatic_byte_count ), wordSize );
2739 orig_nonstatic_field_size = nonstatic_field_size +
2740 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/wordSize);
2741 }
2742 #endif
2743 bool compact_fields = CompactFields;
2744 int allocation_style = FieldsAllocationStyle;
2745 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range?
2746 assert(false, "0 <= FieldsAllocationStyle <= 1");
2747 allocation_style = 1; // Optimistic
2748 }
2749
2750 // The next classes have predefined hard-coded fields offsets
2751 // (see in JavaClasses::compute_hard_coded_offsets()).
2752 // Use default fields allocation order for them.
2753 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2754 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2755 class_name() == vmSymbols::java_lang_Class() ||
2756 class_name() == vmSymbols::java_lang_ClassLoader() ||
2757 class_name() == vmSymbols::java_lang_ref_Reference() ||
2758 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2759 class_name() == vmSymbols::java_lang_StackTraceElement() ||
2760 class_name() == vmSymbols::java_lang_String() ||
2761 class_name() == vmSymbols::java_lang_Throwable() ||
2762 class_name() == vmSymbols::java_lang_Boolean() ||
2763 class_name() == vmSymbols::java_lang_Character() ||
2764 class_name() == vmSymbols::java_lang_Float() ||
2765 class_name() == vmSymbols::java_lang_Double() ||
2766 class_name() == vmSymbols::java_lang_Byte() ||
2767 class_name() == vmSymbols::java_lang_Short() ||
2768 class_name() == vmSymbols::java_lang_Integer() ||
2769 class_name() == vmSymbols::java_lang_Long())) {
2770 allocation_style = 0; // Allocate oops first
2771 compact_fields = false; // Don't compact fields
2772 }
2773
2774 if( allocation_style == 0 ) {
2775 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2776 next_nonstatic_oop_offset = next_nonstatic_field_offset;
2777 next_nonstatic_double_offset = next_nonstatic_oop_offset +
2778 (nonstatic_oop_count * heapOopSize);
2779 } else if( allocation_style == 1 ) {
2780 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
2781 next_nonstatic_double_offset = next_nonstatic_field_offset;
2782 } else {
2783 ShouldNotReachHere();
2784 }
2785
2786 int nonstatic_oop_space_count = 0;
2787 int nonstatic_word_space_count = 0;
2788 int nonstatic_short_space_count = 0;
2789 int nonstatic_byte_space_count = 0;
2790 int nonstatic_oop_space_offset;
2791 int nonstatic_word_space_offset;
2792 int nonstatic_short_space_offset;
2793 int nonstatic_byte_space_offset;
2794
2795 bool compact_into_header = (UseCompressedOops &&
2796 allocation_style == 1 && compact_fields &&
2797 !super_has_nonstatic_fields);
2798
2799 if( compact_into_header || nonstatic_double_count > 0 ) {
2800 int offset;
2801 // Pack something in with the header if no super klass has done so.
2802 if (compact_into_header) {
2803 offset = oopDesc::klass_gap_offset_in_bytes();
2804 } else {
2805 offset = next_nonstatic_double_offset;
2806 }
2807 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
2808 if( compact_fields && offset != next_nonstatic_double_offset ) {
2809 // Allocate available fields into the gap before double field.
2810 int length = next_nonstatic_double_offset - offset;
2811 assert(length == BytesPerInt, "");
2812 nonstatic_word_space_offset = offset;
2813 if( nonstatic_word_count > 0 ) {
2814 nonstatic_word_count -= 1;
2815 nonstatic_word_space_count = 1; // Only one will fit
2816 length -= BytesPerInt;
2817 offset += BytesPerInt;
2818 }
2819 nonstatic_short_space_offset = offset;
2820 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
2821 nonstatic_short_count -= 1;
2822 nonstatic_short_space_count += 1;
2823 length -= BytesPerShort;
2824 offset += BytesPerShort;
2825 }
2826 nonstatic_byte_space_offset = offset;
2827 while( length > 0 && nonstatic_byte_count > 0 ) {
2828 nonstatic_byte_count -= 1;
2829 nonstatic_byte_space_count += 1;
2830 length -= 1;
2831 }
2832 // Allocate oop field in the gap if there are no other fields for that.
2833 nonstatic_oop_space_offset = offset;
2834 if(!compact_into_header && length >= heapOopSize &&
2835 nonstatic_oop_count > 0 &&
2836 allocation_style != 0 ) { // when oop fields not first
2837 nonstatic_oop_count -= 1;
2838 nonstatic_oop_space_count = 1; // Only one will fit
2839 length -= heapOopSize;
2840 offset += heapOopSize;
2841 }
2842 }
2843 }
2844
2845 next_nonstatic_word_offset = next_nonstatic_double_offset +
2846 (nonstatic_double_count * BytesPerLong);
2847 next_nonstatic_short_offset = next_nonstatic_word_offset +
2848 (nonstatic_word_count * BytesPerInt);
2849 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2850 (nonstatic_short_count * BytesPerShort);
2851
2852 int notaligned_offset;
2853 if( allocation_style == 0 ) {
2854 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2855 } else { // allocation_style == 1
2856 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2857 if( nonstatic_oop_count > 0 ) {
2858 notaligned_offset = next_nonstatic_oop_offset;
2859 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
2860 }
2861 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
2862 }
2863 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
2864 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
2865 - first_nonstatic_field_offset)/wordSize);
2866
2867 // Iterate over fields again and compute correct offsets.
2868 // The field allocation type was temporarily stored in the offset slot.
2869 // oop fields are located before non-oop fields (static and non-static).
2870 int len = fields->length();
2871 for (int i = 0; i < len; i += instanceKlass::next_offset) {
2872 int real_offset;
2873 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4);
2874 switch (atype) {
2875 case STATIC_OOP:
2876 real_offset = next_static_oop_offset;
2877 next_static_oop_offset += heapOopSize;
2878 break;
2879 case STATIC_BYTE:
2880 real_offset = next_static_byte_offset;
2881 next_static_byte_offset += 1;
2882 break;
2883 case STATIC_SHORT:
2884 real_offset = next_static_short_offset;
2885 next_static_short_offset += BytesPerShort;
2886 break;
2887 case STATIC_WORD:
2888 real_offset = next_static_word_offset;
2889 next_static_word_offset += BytesPerInt;
2890 break;
2891 case STATIC_ALIGNED_DOUBLE:
2892 case STATIC_DOUBLE:
2893 real_offset = next_static_double_offset;
2894 next_static_double_offset += BytesPerLong;
2895 break;
2896 case NONSTATIC_OOP:
2897 if( nonstatic_oop_space_count > 0 ) {
2898 real_offset = nonstatic_oop_space_offset;
2899 nonstatic_oop_space_offset += heapOopSize;
2900 nonstatic_oop_space_count -= 1;
2901 } else {
2902 real_offset = next_nonstatic_oop_offset;
2903 next_nonstatic_oop_offset += heapOopSize;
2904 }
2905 // Update oop maps
2906 if( nonstatic_oop_map_count > 0 &&
2907 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
2908 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * heapOopSize) ) {
2909 // Extend current oop map
2910 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1;
2911 } else {
2912 // Create new oop map
2913 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset;
2914 nonstatic_oop_length [nonstatic_oop_map_count] = 1;
2915 nonstatic_oop_map_count += 1;
2916 if( first_nonstatic_oop_offset == 0 ) { // Undefined
2917 first_nonstatic_oop_offset = real_offset;
2918 }
2919 }
2920 break;
2921 case NONSTATIC_BYTE:
2922 if( nonstatic_byte_space_count > 0 ) {
2923 real_offset = nonstatic_byte_space_offset;
2924 nonstatic_byte_space_offset += 1;
2925 nonstatic_byte_space_count -= 1;
2926 } else {
2927 real_offset = next_nonstatic_byte_offset;
2928 next_nonstatic_byte_offset += 1;
2929 }
2930 break;
2931 case NONSTATIC_SHORT:
2932 if( nonstatic_short_space_count > 0 ) {
2933 real_offset = nonstatic_short_space_offset;
2934 nonstatic_short_space_offset += BytesPerShort;
2935 nonstatic_short_space_count -= 1;
2936 } else {
2937 real_offset = next_nonstatic_short_offset;
2938 next_nonstatic_short_offset += BytesPerShort;
2939 }
2940 break;
2941 case NONSTATIC_WORD:
2942 if( nonstatic_word_space_count > 0 ) {
2943 real_offset = nonstatic_word_space_offset;
2944 nonstatic_word_space_offset += BytesPerInt;
2945 nonstatic_word_space_count -= 1;
2946 } else {
2947 real_offset = next_nonstatic_word_offset;
2948 next_nonstatic_word_offset += BytesPerInt;
2949 }
2950 break;
2951 case NONSTATIC_ALIGNED_DOUBLE:
2952 case NONSTATIC_DOUBLE:
2953 real_offset = next_nonstatic_double_offset;
2954 next_nonstatic_double_offset += BytesPerLong;
2955 break;
2956 default:
2957 ShouldNotReachHere();
2958 }
2959 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) );
2960 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) );
2961 }
2962
2963 // Size of instances
2964 int instance_size;
2965
2966 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
2967
2968 assert(instance_size == align_object_size(instanceOopDesc::header_size() + nonstatic_field_size), "consistent layout helper value");
2969
2970 // Size of non-static oop map blocks (in words) allocated at end of klass
2971 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset);
2972
2973 // Compute reference type
2974 ReferenceType rt;
2975 if (super_klass() == NULL) {
2976 rt = REF_NONE;
2977 } else {
2978 rt = super_klass->reference_type();
2979 }
2980
2981 // We can now create the basic klassOop for this klass
2982 klassOop ik = oopFactory::new_instanceKlass(
2983 vtable_size, itable_size,
2984 static_field_size, nonstatic_oop_map_size,
2985 rt, CHECK_(nullHandle));
2986 instanceKlassHandle this_klass (THREAD, ik);
2987
2988 assert(this_klass->static_field_size() == static_field_size &&
2989 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check");
2990
2991 // Fill in information already parsed
2992 this_klass->set_access_flags(access_flags);
2993 jint lh = Klass::instance_layout_helper(instance_size, false);
2994 this_klass->set_layout_helper(lh);
2995 assert(this_klass->oop_is_instance(), "layout is correct");
2996 assert(this_klass->size_helper() == instance_size, "correct size_helper");
2997 // Not yet: supers are done below to support the new subtype-checking fields
2998 //this_klass->set_super(super_klass());
2999 this_klass->set_class_loader(class_loader());
3000 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3001 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3002 this_klass->set_static_oop_field_size(fac.static_oop_count);
3003 cp->set_pool_holder(this_klass());
3004 this_klass->set_constants(cp());
3005 this_klass->set_local_interfaces(local_interfaces());
3006 this_klass->set_fields(fields());
3007 this_klass->set_methods(methods());
3008 if (has_final_method) {
3009 this_klass->set_has_final_method();
3010 }
3011 this_klass->set_method_ordering(method_ordering());
3012 this_klass->set_initial_method_idnum(methods->length());
3013 this_klass->set_name(cp->klass_name_at(this_class_index));
3014 this_klass->set_protection_domain(protection_domain());
3015 this_klass->set_fields_annotations(fields_annotations());
3016 this_klass->set_methods_annotations(methods_annotations());
3017 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3018 this_klass->set_methods_default_annotations(methods_default_annotations());
3019
3020 this_klass->set_minor_version(minor_version);
3021 this_klass->set_major_version(major_version);
3022
3023 if (cached_class_file_bytes != NULL) {
3024 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3025 this_klass->set_cached_class_file(cached_class_file_bytes,
3026 cached_class_file_length);
3027 }
3028
3029 // Miranda methods
3030 if ((num_miranda_methods > 0) ||
3031 // if this class introduced new miranda methods or
3032 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3033 // super class exists and this class inherited miranda methods
3034 ) {
3035 this_klass->set_has_miranda_methods(); // then set a flag
3036 }
3037
3038 // Additional attributes
3039 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3040
3041 // Make sure this is the end of class file stream
3042 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3043
3044 // Initialize static fields
3045 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3046
3047 // VerifyOops believes that once this has been set, the object is completely loaded.
3048 // Compute transitive closure of interfaces this class implements
3049 this_klass->set_transitive_interfaces(transitive_interfaces());
3050
3051 // Fill in information needed to compute superclasses.
3052 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3053
3054 // Initialize itable offset tables
3055 klassItable::setup_itable_offset_table(this_klass);
3056
3057 // Do final class setup
3058 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length);
3059
3060 set_precomputed_flags(this_klass);
3061
3062 // reinitialize modifiers, using the InnerClasses attribute
3063 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3064 this_klass->set_modifier_flags(computed_modifiers);
3065
3066 // check if this class can access its super class
3067 check_super_class_access(this_klass, CHECK_(nullHandle));
3068
3069 // check if this class can access its superinterfaces
3070 check_super_interface_access(this_klass, CHECK_(nullHandle));
3071
3072 // check if this class overrides any final method
3073 check_final_method_override(this_klass, CHECK_(nullHandle));
3074
3075 // check that if this class is an interface then it doesn't have static methods
3076 if (this_klass->is_interface()) {
3077 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3078 }
3079
3080 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3081 false /* not shared class */);
3082
3083 if (TraceClassLoading) {
3084 // print in a single call to reduce interleaving of output
3085 if (cfs->source() != NULL) {
3086 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3087 cfs->source());
3088 } else if (class_loader.is_null()) {
3089 if (THREAD->is_Java_thread()) {
3090 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3091 tty->print("[Loaded %s by instance of %s]\n",
3092 this_klass->external_name(),
3093 instanceKlass::cast(caller)->external_name());
3094 } else {
3095 tty->print("[Loaded %s]\n", this_klass->external_name());
3096 }
3097 } else {
3098 ResourceMark rm;
3099 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3100 instanceKlass::cast(class_loader->klass())->external_name());
3101 }
3102 }
3103
3104 if (TraceClassResolution) {
3105 // print out the superclass.
3106 const char * from = Klass::cast(this_klass())->external_name();
3107 if (this_klass->java_super() != NULL) {
3108 tty->print("RESOLVE %s %s\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3109 }
3110 // print out each of the interface classes referred to by this class.
3111 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3112 if (!local_interfaces.is_null()) {
3113 int length = local_interfaces->length();
3114 for (int i = 0; i < length; i++) {
3115 klassOop k = klassOop(local_interfaces->obj_at(i));
3116 instanceKlass* to_class = instanceKlass::cast(k);
3117 const char * to = to_class->external_name();
3118 tty->print("RESOLVE %s %s\n", from, to);
3119 }
3120 }
3121 }
3122
3123 #ifndef PRODUCT
3124 if( PrintCompactFieldsSavings ) {
3125 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3126 tty->print("[Saved %d of %3d words in %s]\n",
3127 orig_nonstatic_field_size - nonstatic_field_size,
3128 orig_nonstatic_field_size, this_klass->external_name());
3129 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3130 tty->print("[Wasted %d over %3d words in %s]\n",
3131 nonstatic_field_size - orig_nonstatic_field_size,
3132 orig_nonstatic_field_size, this_klass->external_name());
3133 }
3134 }
3135 #endif
3136
3137 // preserve result across HandleMark
3138 preserve_this_klass = this_klass();
3139 }
3140
3141 // Create new handle outside HandleMark
3142 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3143 debug_only(this_klass->as_klassOop()->verify();)
3144
3145 return this_klass;
3146 }
3147
3148
3149 int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) {
3150 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size();
3151 if (nonstatic_oop_map_count > 0) {
3152 // We have oops to add to map
3153 if (map_size == 0) {
3154 map_size = nonstatic_oop_map_count;
3155 } else {
3156 // Check whether we should add a new map block or whether the last one can be extended
3157 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps();
3158 OopMapBlock* last_map = first_map + map_size - 1;
3159
3160 int next_offset = last_map->offset() + (last_map->length() * heapOopSize);
3161 if (next_offset == first_nonstatic_oop_offset) {
3162 // There is no gap bettwen superklass's last oop field and first
3163 // local oop field, merge maps.
3164 nonstatic_oop_map_count -= 1;
3165 } else {
3166 // Superklass didn't end with a oop field, add extra maps
3167 assert(next_offset<first_nonstatic_oop_offset, "just checking");
3168 }
3169 map_size += nonstatic_oop_map_count;
3170 }
3171 }
3172 return map_size;
3173 }
3174
3175
3176 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3177 int nonstatic_oop_map_count,
3178 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) {
3179 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3180 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size();
3181 instanceKlass* super = k->superklass();
3182 if (super != NULL) {
3183 int super_oop_map_size = super->nonstatic_oop_map_size();
3184 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3185 // Copy maps from superklass
3186 while (super_oop_map_size-- > 0) {
3187 *this_oop_map++ = *super_oop_map++;
3188 }
3189 }
3190 if (nonstatic_oop_map_count > 0) {
3191 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) {
3192 // Calculated in compute_oop_map_size() number of oop maps is less then
3193 // collected oop maps since there is no gap between superklass's last oop
3194 // field and first local oop field. Extend the last oop map copied
3195 // from the superklass instead of creating new one.
3196 nonstatic_oop_map_count--;
3197 nonstatic_oop_offsets++;
3198 this_oop_map--;
3199 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++);
3200 this_oop_map++;
3201 }
3202 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking");
3203 // Add new map blocks, fill them
3204 while (nonstatic_oop_map_count-- > 0) {
3205 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3206 this_oop_map->set_length(*nonstatic_oop_length++);
3207 this_oop_map++;
3208 }
3209 }
3210 }
3211
3212
3213 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3214 klassOop super = k->super();
3215
3216 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3217 // in which case we don't have to register objects as finalizable
3218 if (!_has_empty_finalizer) {
3219 if (_has_finalizer ||
3220 (super != NULL && super->klass_part()->has_finalizer())) {
3221 k->set_has_finalizer();
3222 }
3223 }
3224
3225 #ifdef ASSERT
3226 bool f = false;
3227 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3228 vmSymbols::void_method_signature());
3229 if (m != NULL && !m->is_empty_method()) {
3230 f = true;
3231 }
3232 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3233 #endif
3234
3235 // Check if this klass supports the java.lang.Cloneable interface
3236 if (SystemDictionary::cloneable_klass_loaded()) {
3237 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) {
3238 k->set_is_cloneable();
3239 }
3240 }
3241
3242 // Check if this klass has a vanilla default constructor
3243 if (super == NULL) {
3244 // java.lang.Object has empty default constructor
3245 k->set_has_vanilla_constructor();
3246 } else {
3247 if (Klass::cast(super)->has_vanilla_constructor() &&
3248 _has_vanilla_constructor) {
3249 k->set_has_vanilla_constructor();
3250 }
3251 #ifdef ASSERT
3252 bool v = false;
3253 if (Klass::cast(super)->has_vanilla_constructor()) {
3254 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3255 ), vmSymbols::void_method_signature());
3256 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3257 v = true;
3258 }
3259 }
3260 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3261 #endif
3262 }
3263
3264 // If it cannot be fast-path allocated, set a bit in the layout helper.
3265 // See documentation of instanceKlass::can_be_fastpath_allocated().
3266 assert(k->size_helper() > 0, "layout_helper is initialized");
3267 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3268 || k->is_abstract() || k->is_interface()
3269 || (k->name() == vmSymbols::java_lang_Class()
3270 && k->class_loader() == NULL)
3271 || k->size_helper() >= FastAllocateSizeLimit) {
3272 // Forbid fast-path allocation.
3273 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3274 k->set_layout_helper(lh);
3275 }
3276 }
3277
3278
3279 // utility method for appending and array with check for duplicates
3280
3281 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3282 // iterate over new interfaces
3283 for (int i = 0; i < ifs->length(); i++) {
3284 oop e = ifs->obj_at(i);
3285 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3286 // check for duplicates
3287 bool duplicate = false;
3288 for (int j = 0; j < index; j++) {
3289 if (result->obj_at(j) == e) {
3290 duplicate = true;
3291 break;
3292 }
3293 }
3294 // add new interface
3295 if (!duplicate) {
3296 result->obj_at_put(index++, e);
3297 }
3298 }
3299 }
3300
3301 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3302 // Compute maximum size for transitive interfaces
3303 int max_transitive_size = 0;
3304 int super_size = 0;
3305 // Add superclass transitive interfaces size
3306 if (super.not_null()) {
3307 super_size = super->transitive_interfaces()->length();
3308 max_transitive_size += super_size;
3309 }
3310 // Add local interfaces' super interfaces
3311 int local_size = local_ifs->length();
3312 for (int i = 0; i < local_size; i++) {
3313 klassOop l = klassOop(local_ifs->obj_at(i));
3314 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3315 }
3316 // Finally add local interfaces
3317 max_transitive_size += local_size;
3318 // Construct array
3319 objArrayHandle result;
3320 if (max_transitive_size == 0) {
3321 // no interfaces, use canonicalized array
3322 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3323 } else if (max_transitive_size == super_size) {
3324 // no new local interfaces added, share superklass' transitive interface array
3325 result = objArrayHandle(THREAD, super->transitive_interfaces());
3326 } else if (max_transitive_size == local_size) {
3327 // only local interfaces added, share local interface array
3328 result = local_ifs;
3329 } else {
3330 objArrayHandle nullHandle;
3331 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3332 result = objArrayHandle(THREAD, new_objarray);
3333 int index = 0;
3334 // Copy down from superclass
3335 if (super.not_null()) {
3336 append_interfaces(result, index, super->transitive_interfaces());
3337 }
3338 // Copy down from local interfaces' superinterfaces
3339 for (int i = 0; i < local_ifs->length(); i++) {
3340 klassOop l = klassOop(local_ifs->obj_at(i));
3341 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3342 }
3343 // Finally add local interfaces
3344 append_interfaces(result, index, local_ifs());
3345
3346 // Check if duplicates were removed
3347 if (index != max_transitive_size) {
3348 assert(index < max_transitive_size, "just checking");
3349 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3350 for (int i = 0; i < index; i++) {
3351 oop e = result->obj_at(i);
3352 assert(e != NULL, "just checking");
3353 new_result->obj_at_put(i, e);
3354 }
3355 result = objArrayHandle(THREAD, new_result);
3356 }
3357 }
3358 return result;
3359 }
3360
3361
3362 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3363 klassOop super = this_klass->super();
3364 if ((super != NULL) &&
3365 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3366 ResourceMark rm(THREAD);
3367 Exceptions::fthrow(
3368 THREAD_AND_LOCATION,
3369 vmSymbolHandles::java_lang_IllegalAccessError(),
3370 "class %s cannot access its superclass %s",
3371 this_klass->external_name(),
3372 instanceKlass::cast(super)->external_name()
3373 );
3374 return;
3375 }
3376 }
3377
3378
3379 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3380 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3381 int lng = local_interfaces->length();
3382 for (int i = lng - 1; i >= 0; i--) {
3383 klassOop k = klassOop(local_interfaces->obj_at(i));
3384 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3385 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3386 ResourceMark rm(THREAD);
3387 Exceptions::fthrow(
3388 THREAD_AND_LOCATION,
3389 vmSymbolHandles::java_lang_IllegalAccessError(),
3390 "class %s cannot access its superinterface %s",
3391 this_klass->external_name(),
3392 instanceKlass::cast(k)->external_name()
3393 );
3394 return;
3395 }
3396 }
3397 }
3398
3399
3400 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3401 objArrayHandle methods (THREAD, this_klass->methods());
3402 int num_methods = methods->length();
3403
3404 // go thru each method and check if it overrides a final method
3405 for (int index = 0; index < num_methods; index++) {
3406 methodOop m = (methodOop)methods->obj_at(index);
3407
3408 // skip private, static and <init> methods
3409 if ((!m->is_private()) &&
3410 (!m->is_static()) &&
3411 (m->name() != vmSymbols::object_initializer_name())) {
3412
3413 symbolOop name = m->name();
3414 symbolOop signature = m->signature();
3415 klassOop k = this_klass->super();
3416 methodOop super_m = NULL;
3417 while (k != NULL) {
3418 // skip supers that don't have final methods.
3419 if (k->klass_part()->has_final_method()) {
3420 // lookup a matching method in the super class hierarchy
3421 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3422 if (super_m == NULL) {
3423 break; // didn't find any match; get out
3424 }
3425
3426 if (super_m->is_final() &&
3427 // matching method in super is final
3428 (Reflection::verify_field_access(this_klass->as_klassOop(),
3429 super_m->method_holder(),
3430 super_m->method_holder(),
3431 super_m->access_flags(), false))
3432 // this class can access super final method and therefore override
3433 ) {
3434 ResourceMark rm(THREAD);
3435 Exceptions::fthrow(
3436 THREAD_AND_LOCATION,
3437 vmSymbolHandles::java_lang_VerifyError(),
3438 "class %s overrides final method %s.%s",
3439 this_klass->external_name(),
3440 name->as_C_string(),
3441 signature->as_C_string()
3442 );
3443 return;
3444 }
3445
3446 // continue to look from super_m's holder's super.
3447 k = instanceKlass::cast(super_m->method_holder())->super();
3448 continue;
3449 }
3450
3451 k = k->klass_part()->super();
3452 }
3453 }
3454 }
3455 }
3456
3457
3458 // assumes that this_klass is an interface
3459 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3460 assert(this_klass->is_interface(), "not an interface");
3461 objArrayHandle methods (THREAD, this_klass->methods());
3462 int num_methods = methods->length();
3463
3464 for (int index = 0; index < num_methods; index++) {
3465 methodOop m = (methodOop)methods->obj_at(index);
3466 // if m is static and not the init method, throw a verify error
3467 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3468 ResourceMark rm(THREAD);
3469 Exceptions::fthrow(
3470 THREAD_AND_LOCATION,
3471 vmSymbolHandles::java_lang_VerifyError(),
3472 "Illegal static method %s in interface %s",
3473 m->name()->as_C_string(),
3474 this_klass->external_name()
3475 );
3476 return;
3477 }
3478 }
3479 }
3480
3481 // utility methods for format checking
3482
3483 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3484 if (!_need_verify) { return; }
3485
3486 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3487 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3488 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3489 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3490 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3491 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3492 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3493
3494 if ((is_abstract && is_final) ||
3495 (is_interface && !is_abstract) ||
3496 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3497 (!is_interface && major_gte_15 && is_annotation)) {
3498 ResourceMark rm(THREAD);
3499 Exceptions::fthrow(
3500 THREAD_AND_LOCATION,
3501 vmSymbolHandles::java_lang_ClassFormatError(),
3502 "Illegal class modifiers in class %s: 0x%X",
3503 _class_name->as_C_string(), flags
3504 );
3505 return;
3506 }
3507 }
3508
3509 bool ClassFileParser::has_illegal_visibility(jint flags) {
3510 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3511 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3512 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3513
3514 return ((is_public && is_protected) ||
3515 (is_public && is_private) ||
3516 (is_protected && is_private));
3517 }
3518
3519 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3520 u2 max_version = JDK_Version::is_gte_jdk17x_version() ?
3521 JAVA_MAX_SUPPORTED_VERSION : JAVA_6_VERSION;
3522 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3523 (major <= max_version) &&
3524 ((major != max_version) ||
3525 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3526 }
3527
3528 void ClassFileParser::verify_legal_field_modifiers(
3529 jint flags, bool is_interface, TRAPS) {
3530 if (!_need_verify) { return; }
3531
3532 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3533 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3534 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3535 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3536 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3537 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3538 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3539 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3540 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3541
3542 bool is_illegal = false;
3543
3544 if (is_interface) {
3545 if (!is_public || !is_static || !is_final || is_private ||
3546 is_protected || is_volatile || is_transient ||
3547 (major_gte_15 && is_enum)) {
3548 is_illegal = true;
3549 }
3550 } else { // not interface
3551 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3552 is_illegal = true;
3553 }
3554 }
3555
3556 if (is_illegal) {
3557 ResourceMark rm(THREAD);
3558 Exceptions::fthrow(
3559 THREAD_AND_LOCATION,
3560 vmSymbolHandles::java_lang_ClassFormatError(),
3561 "Illegal field modifiers in class %s: 0x%X",
3562 _class_name->as_C_string(), flags);
3563 return;
3564 }
3565 }
3566
3567 void ClassFileParser::verify_legal_method_modifiers(
3568 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3569 if (!_need_verify) { return; }
3570
3571 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3572 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3573 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3574 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3575 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3576 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3577 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3578 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3579 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3580 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3581 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3582
3583 bool is_illegal = false;
3584
3585 if (is_interface) {
3586 if (!is_abstract || !is_public || is_static || is_final ||
3587 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3588 is_illegal = true;
3589 }
3590 } else { // not interface
3591 if (is_initializer) {
3592 if (is_static || is_final || is_synchronized || is_native ||
3593 is_abstract || (major_gte_15 && is_bridge)) {
3594 is_illegal = true;
3595 }
3596 } else { // not initializer
3597 if (is_abstract) {
3598 if ((is_final || is_native || is_private || is_static ||
3599 (major_gte_15 && (is_synchronized || is_strict)))) {
3600 is_illegal = true;
3601 }
3602 }
3603 if (has_illegal_visibility(flags)) {
3604 is_illegal = true;
3605 }
3606 }
3607 }
3608
3609 if (is_illegal) {
3610 ResourceMark rm(THREAD);
3611 Exceptions::fthrow(
3612 THREAD_AND_LOCATION,
3613 vmSymbolHandles::java_lang_ClassFormatError(),
3614 "Method %s in class %s has illegal modifiers: 0x%X",
3615 name->as_C_string(), _class_name->as_C_string(), flags);
3616 return;
3617 }
3618 }
3619
3620 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3621 assert(_need_verify, "only called when _need_verify is true");
3622 int i = 0;
3623 int count = length >> 2;
3624 for (int k=0; k<count; k++) {
3625 unsigned char b0 = buffer[i];
3626 unsigned char b1 = buffer[i+1];
3627 unsigned char b2 = buffer[i+2];
3628 unsigned char b3 = buffer[i+3];
3629 // For an unsigned char v,
3630 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3631 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3632 unsigned char res = b0 | b0 - 1 |
3633 b1 | b1 - 1 |
3634 b2 | b2 - 1 |
3635 b3 | b3 - 1;
3636 if (res >= 128) break;
3637 i += 4;
3638 }
3639 for(; i < length; i++) {
3640 unsigned short c;
3641 // no embedded zeros
3642 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3643 if(buffer[i] < 128) {
3644 continue;
3645 }
3646 if ((i + 5) < length) { // see if it's legal supplementary character
3647 if (UTF8::is_supplementary_character(&buffer[i])) {
3648 c = UTF8::get_supplementary_character(&buffer[i]);
3649 i += 5;
3650 continue;
3651 }
3652 }
3653 switch (buffer[i] >> 4) {
3654 default: break;
3655 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3656 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3657 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
3658 c = (buffer[i] & 0x1F) << 6;
3659 i++;
3660 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3661 c += buffer[i] & 0x3F;
3662 if (_major_version <= 47 || c == 0 || c >= 0x80) {
3663 // for classes with major > 47, c must a null or a character in its shortest form
3664 break;
3665 }
3666 }
3667 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3668 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
3669 c = (buffer[i] & 0xF) << 12;
3670 i += 2;
3671 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3672 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3673 if (_major_version <= 47 || c >= 0x800) {
3674 // for classes with major > 47, c must be in its shortest form
3675 break;
3676 }
3677 }
3678 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3679 } // end of switch
3680 } // end of for
3681 }
3682
3683 // Checks if name is a legal class name.
3684 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3685 if (!_need_verify || _relax_verify) { return; }
3686
3687 char buf[fixed_buffer_size];
3688 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3689 unsigned int length = name->utf8_length();
3690 bool legal = false;
3691
3692 if (length > 0) {
3693 char* p;
3694 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3695 p = skip_over_field_signature(bytes, false, length, CHECK);
3696 legal = (p != NULL) && ((p - bytes) == (int)length);
3697 } else if (_major_version < JAVA_1_5_VERSION) {
3698 if (bytes[0] != '<') {
3699 p = skip_over_field_name(bytes, true, length);
3700 legal = (p != NULL) && ((p - bytes) == (int)length);
3701 }
3702 } else {
3703 // 4900761: relax the constraints based on JSR202 spec
3704 // Class names may be drawn from the entire Unicode character set.
3705 // Identifiers between '/' must be unqualified names.
3706 // The utf8 string has been verified when parsing cpool entries.
3707 legal = verify_unqualified_name(bytes, length, LegalClass);
3708 }
3709 }
3710 if (!legal) {
3711 ResourceMark rm(THREAD);
3712 Exceptions::fthrow(
3713 THREAD_AND_LOCATION,
3714 vmSymbolHandles::java_lang_ClassFormatError(),
3715 "Illegal class name \"%s\" in class file %s", bytes,
3716 _class_name->as_C_string()
3717 );
3718 return;
3719 }
3720 }
3721
3722 // Checks if name is a legal field name.
3723 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3724 if (!_need_verify || _relax_verify) { return; }
3725
3726 char buf[fixed_buffer_size];
3727 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3728 unsigned int length = name->utf8_length();
3729 bool legal = false;
3730
3731 if (length > 0) {
3732 if (_major_version < JAVA_1_5_VERSION) {
3733 if (bytes[0] != '<') {
3734 char* p = skip_over_field_name(bytes, false, length);
3735 legal = (p != NULL) && ((p - bytes) == (int)length);
3736 }
3737 } else {
3738 // 4881221: relax the constraints based on JSR202 spec
3739 legal = verify_unqualified_name(bytes, length, LegalField);
3740 }
3741 }
3742
3743 if (!legal) {
3744 ResourceMark rm(THREAD);
3745 Exceptions::fthrow(
3746 THREAD_AND_LOCATION,
3747 vmSymbolHandles::java_lang_ClassFormatError(),
3748 "Illegal field name \"%s\" in class %s", bytes,
3749 _class_name->as_C_string()
3750 );
3751 return;
3752 }
3753 }
3754
3755 // Checks if name is a legal method name.
3756 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
3757 if (!_need_verify || _relax_verify) { return; }
3758
3759 assert(!name.is_null(), "method name is null");
3760 char buf[fixed_buffer_size];
3761 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3762 unsigned int length = name->utf8_length();
3763 bool legal = false;
3764
3765 if (length > 0) {
3766 if (bytes[0] == '<') {
3767 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
3768 legal = true;
3769 }
3770 } else if (_major_version < JAVA_1_5_VERSION) {
3771 char* p;
3772 p = skip_over_field_name(bytes, false, length);
3773 legal = (p != NULL) && ((p - bytes) == (int)length);
3774 } else {
3775 // 4881221: relax the constraints based on JSR202 spec
3776 legal = verify_unqualified_name(bytes, length, LegalMethod);
3777 }
3778 }
3779
3780 if (!legal) {
3781 ResourceMark rm(THREAD);
3782 Exceptions::fthrow(
3783 THREAD_AND_LOCATION,
3784 vmSymbolHandles::java_lang_ClassFormatError(),
3785 "Illegal method name \"%s\" in class %s", bytes,
3786 _class_name->as_C_string()
3787 );
3788 return;
3789 }
3790 }
3791
3792
3793 // Checks if signature is a legal field signature.
3794 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3795 if (!_need_verify) { return; }
3796
3797 char buf[fixed_buffer_size];
3798 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3799 unsigned int length = signature->utf8_length();
3800 char* p = skip_over_field_signature(bytes, false, length, CHECK);
3801
3802 if (p == NULL || (p - bytes) != (int)length) {
3803 ResourceMark rm(THREAD);
3804 Exceptions::fthrow(
3805 THREAD_AND_LOCATION,
3806 vmSymbolHandles::java_lang_ClassFormatError(),
3807 "Field \"%s\" in class %s has illegal signature \"%s\"",
3808 name->as_C_string(), _class_name->as_C_string(), bytes
3809 );
3810 return;
3811 }
3812 }
3813
3814 // Checks if signature is a legal method signature.
3815 // Returns number of parameters
3816 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3817 if (!_need_verify) {
3818 // make sure caller's args_size will be less than 0 even for non-static
3819 // method so it will be recomputed in compute_size_of_parameters().
3820 return -2;
3821 }
3822
3823 unsigned int args_size = 0;
3824 char buf[fixed_buffer_size];
3825 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3826 unsigned int length = signature->utf8_length();
3827 char* nextp;
3828
3829 // The first character must be a '('
3830 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
3831 length--;
3832 // Skip over legal field signatures
3833 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3834 while ((length > 0) && (nextp != NULL)) {
3835 args_size++;
3836 if (p[0] == 'J' || p[0] == 'D') {
3837 args_size++;
3838 }
3839 length -= nextp - p;
3840 p = nextp;
3841 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3842 }
3843 // The first non-signature thing better be a ')'
3844 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
3845 length--;
3846 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
3847 // All internal methods must return void
3848 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
3849 return args_size;
3850 }
3851 } else {
3852 // Now we better just have a return value
3853 nextp = skip_over_field_signature(p, true, length, CHECK_0);
3854 if (nextp && ((int)length == (nextp - p))) {
3855 return args_size;
3856 }
3857 }
3858 }
3859 }
3860 // Report error
3861 ResourceMark rm(THREAD);
3862 Exceptions::fthrow(
3863 THREAD_AND_LOCATION,
3864 vmSymbolHandles::java_lang_ClassFormatError(),
3865 "Method \"%s\" in class %s has illegal signature \"%s\"",
3866 name->as_C_string(), _class_name->as_C_string(), p
3867 );
3868 return 0;
3869 }
3870
3871
3872 // Unqualified names may not contain the characters '.', ';', or '/'.
3873 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
3874 // Note that method names may not be <init> or <clinit> in this method.
3875 // Because these names have been checked as special cases before calling this method
3876 // in verify_legal_method_name.
3877 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
3878 jchar ch;
3879
3880 for (char* p = name; p != name + length; ) {
3881 ch = *p;
3882 if (ch < 128) {
3883 p++;
3884 if (ch == '.' || ch == ';') {
3885 return false; // do not permit '.' or ';'
3886 }
3887 if (type != LegalClass && ch == '/') {
3888 return false; // do not permit '/' unless it's class name
3889 }
3890 if (type == LegalMethod && (ch == '<' || ch == '>')) {
3891 return false; // do not permit '<' or '>' in method names
3892 }
3893 } else {
3894 char* tmp_p = UTF8::next(p, &ch);
3895 p = tmp_p;
3896 }
3897 }
3898 return true;
3899 }
3900
3901
3902 // Take pointer to a string. Skip over the longest part of the string that could
3903 // be taken as a fieldname. Allow '/' if slash_ok is true.
3904 // Return a pointer to just past the fieldname.
3905 // Return NULL if no fieldname at all was found, or in the case of slash_ok
3906 // being true, we saw consecutive slashes (meaning we were looking for a
3907 // qualified path but found something that was badly-formed).
3908 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
3909 char* p;
3910 jchar ch;
3911 jboolean last_is_slash = false;
3912 jboolean not_first_ch = false;
3913
3914 for (p = name; p != name + length; not_first_ch = true) {
3915 char* old_p = p;
3916 ch = *p;
3917 if (ch < 128) {
3918 p++;
3919 // quick check for ascii
3920 if ((ch >= 'a' && ch <= 'z') ||
3921 (ch >= 'A' && ch <= 'Z') ||
3922 (ch == '_' || ch == '$') ||
3923 (not_first_ch && ch >= '0' && ch <= '9')) {
3924 last_is_slash = false;
3925 continue;
3926 }
3927 if (slash_ok && ch == '/') {
3928 if (last_is_slash) {
3929 return NULL; // Don't permit consecutive slashes
3930 }
3931 last_is_slash = true;
3932 continue;
3933 }
3934 } else {
3935 jint unicode_ch;
3936 char* tmp_p = UTF8::next_character(p, &unicode_ch);
3937 p = tmp_p;
3938 last_is_slash = false;
3939 // Check if ch is Java identifier start or is Java identifier part
3940 // 4672820: call java.lang.Character methods directly without generating separate tables.
3941 EXCEPTION_MARK;
3942 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass());
3943
3944 // return value
3945 JavaValue result(T_BOOLEAN);
3946 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
3947 JavaCallArguments args;
3948 args.push_int(unicode_ch);
3949
3950 // public static boolean isJavaIdentifierStart(char ch);
3951 JavaCalls::call_static(&result,
3952 klass,
3953 vmSymbolHandles::isJavaIdentifierStart_name(),
3954 vmSymbolHandles::int_bool_signature(),
3955 &args,
3956 THREAD);
3957
3958 if (HAS_PENDING_EXCEPTION) {
3959 CLEAR_PENDING_EXCEPTION;
3960 return 0;
3961 }
3962 if (result.get_jboolean()) {
3963 continue;
3964 }
3965
3966 if (not_first_ch) {
3967 // public static boolean isJavaIdentifierPart(char ch);
3968 JavaCalls::call_static(&result,
3969 klass,
3970 vmSymbolHandles::isJavaIdentifierPart_name(),
3971 vmSymbolHandles::int_bool_signature(),
3972 &args,
3973 THREAD);
3974
3975 if (HAS_PENDING_EXCEPTION) {
3976 CLEAR_PENDING_EXCEPTION;
3977 return 0;
3978 }
3979
3980 if (result.get_jboolean()) {
3981 continue;
3982 }
3983 }
3984 }
3985 return (not_first_ch) ? old_p : NULL;
3986 }
3987 return (not_first_ch) ? p : NULL;
3988 }
3989
3990
3991 // Take pointer to a string. Skip over the longest part of the string that could
3992 // be taken as a field signature. Allow "void" if void_ok.
3993 // Return a pointer to just past the signature.
3994 // Return NULL if no legal signature is found.
3995 char* ClassFileParser::skip_over_field_signature(char* signature,
3996 bool void_ok,
3997 unsigned int length,
3998 TRAPS) {
3999 unsigned int array_dim = 0;
4000 while (length > 0) {
4001 switch (signature[0]) {
4002 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4003 case JVM_SIGNATURE_BOOLEAN:
4004 case JVM_SIGNATURE_BYTE:
4005 case JVM_SIGNATURE_CHAR:
4006 case JVM_SIGNATURE_SHORT:
4007 case JVM_SIGNATURE_INT:
4008 case JVM_SIGNATURE_FLOAT:
4009 case JVM_SIGNATURE_LONG:
4010 case JVM_SIGNATURE_DOUBLE:
4011 return signature + 1;
4012 case JVM_SIGNATURE_CLASS: {
4013 if (_major_version < JAVA_1_5_VERSION) {
4014 // Skip over the class name if one is there
4015 char* p = skip_over_field_name(signature + 1, true, --length);
4016
4017 // The next character better be a semicolon
4018 if (p && (p - signature) > 1 && p[0] == ';') {
4019 return p + 1;
4020 }
4021 } else {
4022 // 4900761: For class version > 48, any unicode is allowed in class name.
4023 length--;
4024 signature++;
4025 while (length > 0 && signature[0] != ';') {
4026 if (signature[0] == '.') {
4027 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4028 }
4029 length--;
4030 signature++;
4031 }
4032 if (signature[0] == ';') { return signature + 1; }
4033 }
4034
4035 return NULL;
4036 }
4037 case JVM_SIGNATURE_ARRAY:
4038 array_dim++;
4039 if (array_dim > 255) {
4040 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4041 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4042 }
4043 // The rest of what's there better be a legal signature
4044 signature++;
4045 length--;
4046 void_ok = false;
4047 break;
4048
4049 default:
4050 return NULL;
4051 }
4052 }
4053 return NULL;
4054 }