Thu, 10 Apr 2008 12:21:01 -0400
6615981: JVM class file parser incorrectly rejects class files with version < 45.2
Summary: A check on Code length did not take into account the old sizes of the max_stack, max_locals, and code_length.
Reviewed-by: phh, sbohne
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 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_classFileParser.cpp.incl"
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.
33 // We add assert in debug mode when class format is not checked.
35 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
36 #define JAVA_MIN_SUPPORTED_VERSION 45
37 #define JAVA_MAX_SUPPORTED_VERSION 50
38 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
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
45 // Used for backward compatibility reasons:
46 // - to check for javac bug fixes that happened after 1.5
47 #define JAVA_6_VERSION 50
50 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
51 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
52 // this function (_current can be allocated in a register, with scalar
53 // replacement of aggregates). The _current pointer is copied back to
54 // stream() when this function returns. DON'T call another method within
55 // this method that uses stream().
56 ClassFileStream* cfs0 = stream();
57 ClassFileStream cfs1 = *cfs0;
58 ClassFileStream* cfs = &cfs1;
59 #ifdef ASSERT
60 u1* old_current = cfs0->current();
61 #endif
63 // Used for batching symbol allocations.
64 const char* names[SymbolTable::symbol_alloc_batch_size];
65 int lengths[SymbolTable::symbol_alloc_batch_size];
66 int indices[SymbolTable::symbol_alloc_batch_size];
67 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
68 int names_count = 0;
70 // parsing Index 0 is unused
71 for (int index = 1; index < length; index++) {
72 // Each of the following case guarantees one more byte in the stream
73 // for the following tag or the access_flags following constant pool,
74 // so we don't need bounds-check for reading tag.
75 u1 tag = cfs->get_u1_fast();
76 switch (tag) {
77 case JVM_CONSTANT_Class :
78 {
79 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
80 u2 name_index = cfs->get_u2_fast();
81 cp->klass_index_at_put(index, name_index);
82 }
83 break;
84 case JVM_CONSTANT_Fieldref :
85 {
86 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
87 u2 class_index = cfs->get_u2_fast();
88 u2 name_and_type_index = cfs->get_u2_fast();
89 cp->field_at_put(index, class_index, name_and_type_index);
90 }
91 break;
92 case JVM_CONSTANT_Methodref :
93 {
94 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
95 u2 class_index = cfs->get_u2_fast();
96 u2 name_and_type_index = cfs->get_u2_fast();
97 cp->method_at_put(index, class_index, name_and_type_index);
98 }
99 break;
100 case JVM_CONSTANT_InterfaceMethodref :
101 {
102 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
103 u2 class_index = cfs->get_u2_fast();
104 u2 name_and_type_index = cfs->get_u2_fast();
105 cp->interface_method_at_put(index, class_index, name_and_type_index);
106 }
107 break;
108 case JVM_CONSTANT_String :
109 {
110 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
111 u2 string_index = cfs->get_u2_fast();
112 cp->string_index_at_put(index, string_index);
113 }
114 break;
115 case JVM_CONSTANT_Integer :
116 {
117 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
118 u4 bytes = cfs->get_u4_fast();
119 cp->int_at_put(index, (jint) bytes);
120 }
121 break;
122 case JVM_CONSTANT_Float :
123 {
124 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
125 u4 bytes = cfs->get_u4_fast();
126 cp->float_at_put(index, *(jfloat*)&bytes);
127 }
128 break;
129 case JVM_CONSTANT_Long :
130 // A mangled type might cause you to overrun allocated memory
131 guarantee_property(index+1 < length,
132 "Invalid constant pool entry %u in class file %s",
133 index, CHECK);
134 {
135 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
136 u8 bytes = cfs->get_u8_fast();
137 cp->long_at_put(index, bytes);
138 }
139 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
140 break;
141 case JVM_CONSTANT_Double :
142 // A mangled type might cause you to overrun allocated memory
143 guarantee_property(index+1 < length,
144 "Invalid constant pool entry %u in class file %s",
145 index, CHECK);
146 {
147 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
148 u8 bytes = cfs->get_u8_fast();
149 cp->double_at_put(index, *(jdouble*)&bytes);
150 }
151 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
152 break;
153 case JVM_CONSTANT_NameAndType :
154 {
155 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
156 u2 name_index = cfs->get_u2_fast();
157 u2 signature_index = cfs->get_u2_fast();
158 cp->name_and_type_at_put(index, name_index, signature_index);
159 }
160 break;
161 case JVM_CONSTANT_Utf8 :
162 {
163 cfs->guarantee_more(2, CHECK); // utf8_length
164 u2 utf8_length = cfs->get_u2_fast();
165 u1* utf8_buffer = cfs->get_u1_buffer();
166 assert(utf8_buffer != NULL, "null utf8 buffer");
167 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
168 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
169 cfs->skip_u1_fast(utf8_length);
170 // Before storing the symbol, make sure it's legal
171 if (_need_verify) {
172 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
173 }
175 unsigned int hash;
176 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
177 if (result == NULL) {
178 names[names_count] = (char*)utf8_buffer;
179 lengths[names_count] = utf8_length;
180 indices[names_count] = index;
181 hashValues[names_count++] = hash;
182 if (names_count == SymbolTable::symbol_alloc_batch_size) {
183 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
184 names_count = 0;
185 }
186 } else {
187 cp->symbol_at_put(index, result);
188 }
189 }
190 break;
191 default:
192 classfile_parse_error(
193 "Unknown constant tag %u in class file %s", tag, CHECK);
194 break;
195 }
196 }
198 // Allocate the remaining symbols
199 if (names_count > 0) {
200 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
201 }
203 // Copy _current pointer of local copy back to stream().
204 #ifdef ASSERT
205 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
206 #endif
207 cfs0->set_current(cfs1.current());
208 }
210 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
212 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
213 ClassFileStream* cfs = stream();
214 constantPoolHandle nullHandle;
216 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
217 u2 length = cfs->get_u2_fast();
218 guarantee_property(
219 length >= 1, "Illegal constant pool size %u in class file %s",
220 length, CHECK_(nullHandle));
221 constantPoolOop constant_pool =
222 oopFactory::new_constantPool(length, CHECK_(nullHandle));
223 constantPoolHandle cp (THREAD, constant_pool);
225 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
227 // parsing constant pool entries
228 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
230 int index = 1; // declared outside of loops for portability
232 // first verification pass - validate cross references and fixup class and string constants
233 for (index = 1; index < length; index++) { // Index 0 is unused
234 switch (cp->tag_at(index).value()) {
235 case JVM_CONSTANT_Class :
236 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
237 break;
238 case JVM_CONSTANT_Fieldref :
239 // fall through
240 case JVM_CONSTANT_Methodref :
241 // fall through
242 case JVM_CONSTANT_InterfaceMethodref : {
243 if (!_need_verify) break;
244 int klass_ref_index = cp->klass_ref_index_at(index);
245 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
246 check_property(valid_cp_range(klass_ref_index, length) &&
247 cp->tag_at(klass_ref_index).is_klass_reference(),
248 "Invalid constant pool index %u in class file %s",
249 klass_ref_index,
250 CHECK_(nullHandle));
251 check_property(valid_cp_range(name_and_type_ref_index, length) &&
252 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
253 "Invalid constant pool index %u in class file %s",
254 name_and_type_ref_index,
255 CHECK_(nullHandle));
256 break;
257 }
258 case JVM_CONSTANT_String :
259 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
260 break;
261 case JVM_CONSTANT_Integer :
262 break;
263 case JVM_CONSTANT_Float :
264 break;
265 case JVM_CONSTANT_Long :
266 case JVM_CONSTANT_Double :
267 index++;
268 check_property(
269 (index < length && cp->tag_at(index).is_invalid()),
270 "Improper constant pool long/double index %u in class file %s",
271 index, CHECK_(nullHandle));
272 break;
273 case JVM_CONSTANT_NameAndType : {
274 if (!_need_verify) break;
275 int name_ref_index = cp->name_ref_index_at(index);
276 int signature_ref_index = cp->signature_ref_index_at(index);
277 check_property(
278 valid_cp_range(name_ref_index, length) &&
279 cp->tag_at(name_ref_index).is_utf8(),
280 "Invalid constant pool index %u in class file %s",
281 name_ref_index, CHECK_(nullHandle));
282 check_property(
283 valid_cp_range(signature_ref_index, length) &&
284 cp->tag_at(signature_ref_index).is_utf8(),
285 "Invalid constant pool index %u in class file %s",
286 signature_ref_index, CHECK_(nullHandle));
287 break;
288 }
289 case JVM_CONSTANT_Utf8 :
290 break;
291 case JVM_CONSTANT_UnresolvedClass : // fall-through
292 case JVM_CONSTANT_UnresolvedClassInError:
293 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
294 break;
295 case JVM_CONSTANT_ClassIndex :
296 {
297 int class_index = cp->klass_index_at(index);
298 check_property(
299 valid_cp_range(class_index, length) &&
300 cp->tag_at(class_index).is_utf8(),
301 "Invalid constant pool index %u in class file %s",
302 class_index, CHECK_(nullHandle));
303 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
304 }
305 break;
306 case JVM_CONSTANT_UnresolvedString :
307 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
308 break;
309 case JVM_CONSTANT_StringIndex :
310 {
311 int string_index = cp->string_index_at(index);
312 check_property(
313 valid_cp_range(string_index, length) &&
314 cp->tag_at(string_index).is_utf8(),
315 "Invalid constant pool index %u in class file %s",
316 string_index, CHECK_(nullHandle));
317 symbolOop sym = cp->symbol_at(string_index);
318 cp->unresolved_string_at_put(index, sym);
319 }
320 break;
321 default:
322 fatal1("bad constant pool tag value %u", cp->tag_at(index).value());
323 ShouldNotReachHere();
324 break;
325 } // end of switch
326 } // end of for
328 if (!_need_verify) {
329 return cp;
330 }
332 // second verification pass - checks the strings are of the right format.
333 for (index = 1; index < length; index++) {
334 jbyte tag = cp->tag_at(index).value();
335 switch (tag) {
336 case JVM_CONSTANT_UnresolvedClass: {
337 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
338 verify_legal_class_name(class_name, CHECK_(nullHandle));
339 break;
340 }
341 case JVM_CONSTANT_Fieldref:
342 case JVM_CONSTANT_Methodref:
343 case JVM_CONSTANT_InterfaceMethodref: {
344 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
345 // already verified to be utf8
346 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
347 // already verified to be utf8
348 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
349 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
350 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
351 if (tag == JVM_CONSTANT_Fieldref) {
352 verify_legal_field_name(name, CHECK_(nullHandle));
353 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
354 } else {
355 verify_legal_method_name(name, CHECK_(nullHandle));
356 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
357 if (tag == JVM_CONSTANT_Methodref) {
358 // 4509014: If a class method name begins with '<', it must be "<init>".
359 assert(!name.is_null(), "method name in constant pool is null");
360 unsigned int name_len = name->utf8_length();
361 assert(name_len > 0, "bad method name"); // already verified as legal name
362 if (name->byte_at(0) == '<') {
363 if (name() != vmSymbols::object_initializer_name()) {
364 classfile_parse_error(
365 "Bad method name at constant pool index %u in class file %s",
366 name_ref_index, CHECK_(nullHandle));
367 }
368 }
369 }
370 }
371 break;
372 }
373 } // end of switch
374 } // end of for
376 return cp;
377 }
380 class NameSigHash: public ResourceObj {
381 public:
382 symbolOop _name; // name
383 symbolOop _sig; // signature
384 NameSigHash* _next; // Next entry in hash table
385 };
388 #define HASH_ROW_SIZE 256
390 unsigned int hash(symbolOop name, symbolOop sig) {
391 unsigned int raw_hash = 0;
392 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
393 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
395 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
396 }
399 void initialize_hashtable(NameSigHash** table) {
400 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
401 }
403 // Return false if the name/sig combination is found in table.
404 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
405 // The old format checker uses heap sort to find duplicates.
406 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
407 // of table since we don't expect symbolOop's to move.
408 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
409 assert(name != NULL, "name in constant pool is NULL");
411 // First lookup for duplicates
412 int index = hash(name, sig);
413 NameSigHash* entry = table[index];
414 while (entry != NULL) {
415 if (entry->_name == name && entry->_sig == sig) {
416 return false;
417 }
418 entry = entry->_next;
419 }
421 // No duplicate is found, allocate a new entry and fill it.
422 entry = new NameSigHash();
423 entry->_name = name;
424 entry->_sig = sig;
426 // Insert into hash table
427 entry->_next = table[index];
428 table[index] = entry;
430 return true;
431 }
434 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
435 int length,
436 Handle class_loader,
437 Handle protection_domain,
438 PerfTraceTime* vmtimer,
439 symbolHandle class_name,
440 TRAPS) {
441 ClassFileStream* cfs = stream();
442 assert(length > 0, "only called for length>0");
443 objArrayHandle nullHandle;
444 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
445 objArrayHandle interfaces (THREAD, interface_oop);
447 int index;
448 for (index = 0; index < length; index++) {
449 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
450 check_property(
451 valid_cp_range(interface_index, cp->length()) &&
452 cp->tag_at(interface_index).is_unresolved_klass(),
453 "Interface name has bad constant pool index %u in class file %s",
454 interface_index, CHECK_(nullHandle));
455 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
457 // Don't need to check legal name because it's checked when parsing constant pool.
458 // But need to make sure it's not an array type.
459 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
460 "Bad interface name in class file %s", CHECK_(nullHandle));
462 vmtimer->suspend(); // do not count recursive loading twice
463 // Call resolve_super so classcircularity is checked
464 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
465 unresolved_klass, class_loader, protection_domain,
466 false, CHECK_(nullHandle));
467 KlassHandle interf (THREAD, k);
468 vmtimer->resume();
470 if (!Klass::cast(interf())->is_interface()) {
471 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
472 }
473 interfaces->obj_at_put(index, interf());
474 }
476 if (!_need_verify || length <= 1) {
477 return interfaces;
478 }
480 // Check if there's any duplicates in interfaces
481 ResourceMark rm(THREAD);
482 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
483 THREAD, NameSigHash*, HASH_ROW_SIZE);
484 initialize_hashtable(interface_names);
485 bool dup = false;
486 {
487 debug_only(No_Safepoint_Verifier nsv;)
488 for (index = 0; index < length; index++) {
489 klassOop k = (klassOop)interfaces->obj_at(index);
490 symbolOop name = instanceKlass::cast(k)->name();
491 // If no duplicates, add (name, NULL) in hashtable interface_names.
492 if (!put_after_lookup(name, NULL, interface_names)) {
493 dup = true;
494 break;
495 }
496 }
497 }
498 if (dup) {
499 classfile_parse_error("Duplicate interface name in class file %s",
500 CHECK_(nullHandle));
501 }
503 return interfaces;
504 }
507 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
508 // Make sure the constant pool entry is of a type appropriate to this field
509 guarantee_property(
510 (constantvalue_index > 0 &&
511 constantvalue_index < cp->length()),
512 "Bad initial value index %u in ConstantValue attribute in class file %s",
513 constantvalue_index, CHECK);
514 constantTag value_type = cp->tag_at(constantvalue_index);
515 switch ( cp->basic_type_for_signature_at(signature_index) ) {
516 case T_LONG:
517 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
518 break;
519 case T_FLOAT:
520 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
521 break;
522 case T_DOUBLE:
523 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
524 break;
525 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
526 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
527 break;
528 case T_OBJECT:
529 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18)
530 && (value_type.is_string() || value_type.is_unresolved_string())),
531 "Bad string initial value in class file %s", CHECK);
532 break;
533 default:
534 classfile_parse_error(
535 "Unable to set initial value %u in class file %s",
536 constantvalue_index, CHECK);
537 }
538 }
541 // Parse attributes for a field.
542 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
543 u2 attributes_count,
544 bool is_static, u2 signature_index,
545 u2* constantvalue_index_addr,
546 bool* is_synthetic_addr,
547 u2* generic_signature_index_addr,
548 typeArrayHandle* field_annotations,
549 TRAPS) {
550 ClassFileStream* cfs = stream();
551 assert(attributes_count > 0, "length should be greater than 0");
552 u2 constantvalue_index = 0;
553 u2 generic_signature_index = 0;
554 bool is_synthetic = false;
555 u1* runtime_visible_annotations = NULL;
556 int runtime_visible_annotations_length = 0;
557 u1* runtime_invisible_annotations = NULL;
558 int runtime_invisible_annotations_length = 0;
559 while (attributes_count--) {
560 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
561 u2 attribute_name_index = cfs->get_u2_fast();
562 u4 attribute_length = cfs->get_u4_fast();
563 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
564 cp->tag_at(attribute_name_index).is_utf8(),
565 "Invalid field attribute index %u in class file %s",
566 attribute_name_index,
567 CHECK);
568 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
569 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
570 // ignore if non-static
571 if (constantvalue_index != 0) {
572 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
573 }
574 check_property(
575 attribute_length == 2,
576 "Invalid ConstantValue field attribute length %u in class file %s",
577 attribute_length, CHECK);
578 constantvalue_index = cfs->get_u2(CHECK);
579 if (_need_verify) {
580 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
581 }
582 } else if (attribute_name == vmSymbols::tag_synthetic()) {
583 if (attribute_length != 0) {
584 classfile_parse_error(
585 "Invalid Synthetic field attribute length %u in class file %s",
586 attribute_length, CHECK);
587 }
588 is_synthetic = true;
589 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
590 if (attribute_length != 0) {
591 classfile_parse_error(
592 "Invalid Deprecated field attribute length %u in class file %s",
593 attribute_length, CHECK);
594 }
595 } else if (_major_version >= JAVA_1_5_VERSION) {
596 if (attribute_name == vmSymbols::tag_signature()) {
597 if (attribute_length != 2) {
598 classfile_parse_error(
599 "Wrong size %u for field's Signature attribute in class file %s",
600 attribute_length, CHECK);
601 }
602 generic_signature_index = cfs->get_u2(CHECK);
603 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
604 runtime_visible_annotations_length = attribute_length;
605 runtime_visible_annotations = cfs->get_u1_buffer();
606 assert(runtime_visible_annotations != NULL, "null visible annotations");
607 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
608 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
609 runtime_invisible_annotations_length = attribute_length;
610 runtime_invisible_annotations = cfs->get_u1_buffer();
611 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
612 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
613 } else {
614 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
615 }
616 } else {
617 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
618 }
619 }
621 *constantvalue_index_addr = constantvalue_index;
622 *is_synthetic_addr = is_synthetic;
623 *generic_signature_index_addr = generic_signature_index;
624 *field_annotations = assemble_annotations(runtime_visible_annotations,
625 runtime_visible_annotations_length,
626 runtime_invisible_annotations,
627 runtime_invisible_annotations_length,
628 CHECK);
629 return;
630 }
633 // Field allocation types. Used for computing field offsets.
635 enum FieldAllocationType {
636 STATIC_OOP, // Oops
637 STATIC_BYTE, // Boolean, Byte, char
638 STATIC_SHORT, // shorts
639 STATIC_WORD, // ints
640 STATIC_DOUBLE, // long or double
641 STATIC_ALIGNED_DOUBLE,// aligned long or double
642 NONSTATIC_OOP,
643 NONSTATIC_BYTE,
644 NONSTATIC_SHORT,
645 NONSTATIC_WORD,
646 NONSTATIC_DOUBLE,
647 NONSTATIC_ALIGNED_DOUBLE
648 };
651 struct FieldAllocationCount {
652 int static_oop_count;
653 int static_byte_count;
654 int static_short_count;
655 int static_word_count;
656 int static_double_count;
657 int nonstatic_oop_count;
658 int nonstatic_byte_count;
659 int nonstatic_short_count;
660 int nonstatic_word_count;
661 int nonstatic_double_count;
662 };
664 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
665 struct FieldAllocationCount *fac,
666 objArrayHandle* fields_annotations, TRAPS) {
667 ClassFileStream* cfs = stream();
668 typeArrayHandle nullHandle;
669 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
670 u2 length = cfs->get_u2_fast();
671 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
672 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
673 typeArrayHandle fields(THREAD, new_fields);
675 int index = 0;
676 typeArrayHandle field_annotations;
677 for (int n = 0; n < length; n++) {
678 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
680 AccessFlags access_flags;
681 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
682 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
683 access_flags.set_flags(flags);
685 u2 name_index = cfs->get_u2_fast();
686 int cp_size = cp->length();
687 check_property(
688 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
689 "Invalid constant pool index %u for field name in class file %s",
690 name_index, CHECK_(nullHandle));
691 symbolHandle name(THREAD, cp->symbol_at(name_index));
692 verify_legal_field_name(name, CHECK_(nullHandle));
694 u2 signature_index = cfs->get_u2_fast();
695 check_property(
696 valid_cp_range(signature_index, cp_size) &&
697 cp->tag_at(signature_index).is_utf8(),
698 "Invalid constant pool index %u for field signature in class file %s",
699 signature_index, CHECK_(nullHandle));
700 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
701 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
703 u2 constantvalue_index = 0;
704 bool is_synthetic = false;
705 u2 generic_signature_index = 0;
706 bool is_static = access_flags.is_static();
708 u2 attributes_count = cfs->get_u2_fast();
709 if (attributes_count > 0) {
710 parse_field_attributes(cp, attributes_count, is_static, signature_index,
711 &constantvalue_index, &is_synthetic,
712 &generic_signature_index, &field_annotations,
713 CHECK_(nullHandle));
714 if (field_annotations.not_null()) {
715 if (fields_annotations->is_null()) {
716 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
717 *fields_annotations = objArrayHandle(THREAD, md);
718 }
719 (*fields_annotations)->obj_at_put(n, field_annotations());
720 }
721 if (is_synthetic) {
722 access_flags.set_is_synthetic();
723 }
724 }
726 fields->short_at_put(index++, access_flags.as_short());
727 fields->short_at_put(index++, name_index);
728 fields->short_at_put(index++, signature_index);
729 fields->short_at_put(index++, constantvalue_index);
731 // Remember how many oops we encountered and compute allocation type
732 BasicType type = cp->basic_type_for_signature_at(signature_index);
733 FieldAllocationType atype;
734 if ( is_static ) {
735 switch ( type ) {
736 case T_BOOLEAN:
737 case T_BYTE:
738 fac->static_byte_count++;
739 atype = STATIC_BYTE;
740 break;
741 case T_LONG:
742 case T_DOUBLE:
743 if (Universe::field_type_should_be_aligned(type)) {
744 atype = STATIC_ALIGNED_DOUBLE;
745 } else {
746 atype = STATIC_DOUBLE;
747 }
748 fac->static_double_count++;
749 break;
750 case T_CHAR:
751 case T_SHORT:
752 fac->static_short_count++;
753 atype = STATIC_SHORT;
754 break;
755 case T_FLOAT:
756 case T_INT:
757 fac->static_word_count++;
758 atype = STATIC_WORD;
759 break;
760 case T_ARRAY:
761 case T_OBJECT:
762 fac->static_oop_count++;
763 atype = STATIC_OOP;
764 break;
765 case T_ADDRESS:
766 case T_VOID:
767 default:
768 assert(0, "bad field type");
769 }
770 } else {
771 switch ( type ) {
772 case T_BOOLEAN:
773 case T_BYTE:
774 fac->nonstatic_byte_count++;
775 atype = NONSTATIC_BYTE;
776 break;
777 case T_LONG:
778 case T_DOUBLE:
779 if (Universe::field_type_should_be_aligned(type)) {
780 atype = NONSTATIC_ALIGNED_DOUBLE;
781 } else {
782 atype = NONSTATIC_DOUBLE;
783 }
784 fac->nonstatic_double_count++;
785 break;
786 case T_CHAR:
787 case T_SHORT:
788 fac->nonstatic_short_count++;
789 atype = NONSTATIC_SHORT;
790 break;
791 case T_FLOAT:
792 case T_INT:
793 fac->nonstatic_word_count++;
794 atype = NONSTATIC_WORD;
795 break;
796 case T_ARRAY:
797 case T_OBJECT:
798 fac->nonstatic_oop_count++;
799 atype = NONSTATIC_OOP;
800 break;
801 case T_ADDRESS:
802 case T_VOID:
803 default:
804 assert(0, "bad field type");
805 }
806 }
808 // The correct offset is computed later (all oop fields will be located together)
809 // We temporarily store the allocation type in the offset field
810 fields->short_at_put(index++, atype);
811 fields->short_at_put(index++, 0); // Clear out high word of byte offset
812 fields->short_at_put(index++, generic_signature_index);
813 }
815 if (_need_verify && length > 1) {
816 // Check duplicated fields
817 ResourceMark rm(THREAD);
818 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
819 THREAD, NameSigHash*, HASH_ROW_SIZE);
820 initialize_hashtable(names_and_sigs);
821 bool dup = false;
822 {
823 debug_only(No_Safepoint_Verifier nsv;)
824 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
825 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
826 symbolOop name = cp->symbol_at(name_index);
827 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
828 symbolOop sig = cp->symbol_at(sig_index);
829 // If no duplicates, add name/signature in hashtable names_and_sigs.
830 if (!put_after_lookup(name, sig, names_and_sigs)) {
831 dup = true;
832 break;
833 }
834 }
835 }
836 if (dup) {
837 classfile_parse_error("Duplicate field name&signature in class file %s",
838 CHECK_(nullHandle));
839 }
840 }
842 return fields;
843 }
846 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
847 while (length-- > 0) {
848 *dest++ = Bytes::get_Java_u2((u1*) (src++));
849 }
850 }
853 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
854 u4 exception_table_length,
855 constantPoolHandle cp,
856 TRAPS) {
857 ClassFileStream* cfs = stream();
858 typeArrayHandle nullHandle;
860 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
861 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
862 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
864 int index = 0;
865 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
866 for (unsigned int i = 0; i < exception_table_length; i++) {
867 u2 start_pc = cfs->get_u2_fast();
868 u2 end_pc = cfs->get_u2_fast();
869 u2 handler_pc = cfs->get_u2_fast();
870 u2 catch_type_index = cfs->get_u2_fast();
871 // Will check legal target after parsing code array in verifier.
872 if (_need_verify) {
873 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
874 "Illegal exception table range in class file %s", CHECK_(nullHandle));
875 guarantee_property(handler_pc < code_length,
876 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
877 if (catch_type_index != 0) {
878 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
879 (cp->tag_at(catch_type_index).is_klass() ||
880 cp->tag_at(catch_type_index).is_unresolved_klass()),
881 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
882 }
883 }
884 exception_handlers->int_at_put(index++, start_pc);
885 exception_handlers->int_at_put(index++, end_pc);
886 exception_handlers->int_at_put(index++, handler_pc);
887 exception_handlers->int_at_put(index++, catch_type_index);
888 }
889 return exception_handlers;
890 }
892 void ClassFileParser::parse_linenumber_table(
893 u4 code_attribute_length, u4 code_length,
894 CompressedLineNumberWriteStream** write_stream, TRAPS) {
895 ClassFileStream* cfs = stream();
896 unsigned int num_entries = cfs->get_u2(CHECK);
898 // Each entry is a u2 start_pc, and a u2 line_number
899 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
901 // Verify line number attribute and table length
902 check_property(
903 code_attribute_length == sizeof(u2) + length_in_bytes,
904 "LineNumberTable attribute has wrong length in class file %s", CHECK);
906 cfs->guarantee_more(length_in_bytes, CHECK);
908 if ((*write_stream) == NULL) {
909 if (length_in_bytes > fixed_buffer_size) {
910 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
911 } else {
912 (*write_stream) = new CompressedLineNumberWriteStream(
913 linenumbertable_buffer, fixed_buffer_size);
914 }
915 }
917 while (num_entries-- > 0) {
918 u2 bci = cfs->get_u2_fast(); // start_pc
919 u2 line = cfs->get_u2_fast(); // line_number
920 guarantee_property(bci < code_length,
921 "Invalid pc in LineNumberTable in class file %s", CHECK);
922 (*write_stream)->write_pair(bci, line);
923 }
924 }
927 // Class file LocalVariableTable elements.
928 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
929 public:
930 u2 start_bci;
931 u2 length;
932 u2 name_cp_index;
933 u2 descriptor_cp_index;
934 u2 slot;
935 };
938 class LVT_Hash: public CHeapObj {
939 public:
940 LocalVariableTableElement *_elem; // element
941 LVT_Hash* _next; // Next entry in hash table
942 };
944 unsigned int hash(LocalVariableTableElement *elem) {
945 unsigned int raw_hash = elem->start_bci;
947 raw_hash = elem->length + raw_hash * 37;
948 raw_hash = elem->name_cp_index + raw_hash * 37;
949 raw_hash = elem->slot + raw_hash * 37;
951 return raw_hash % HASH_ROW_SIZE;
952 }
954 void initialize_hashtable(LVT_Hash** table) {
955 for (int i = 0; i < HASH_ROW_SIZE; i++) {
956 table[i] = NULL;
957 }
958 }
960 void clear_hashtable(LVT_Hash** table) {
961 for (int i = 0; i < HASH_ROW_SIZE; i++) {
962 LVT_Hash* current = table[i];
963 LVT_Hash* next;
964 while (current != NULL) {
965 next = current->_next;
966 current->_next = NULL;
967 delete(current);
968 current = next;
969 }
970 table[i] = NULL;
971 }
972 }
974 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
975 LVT_Hash* entry = table[index];
977 /*
978 * 3-tuple start_bci/length/slot has to be unique key,
979 * so the following comparison seems to be redundant:
980 * && elem->name_cp_index == entry->_elem->name_cp_index
981 */
982 while (entry != NULL) {
983 if (elem->start_bci == entry->_elem->start_bci
984 && elem->length == entry->_elem->length
985 && elem->name_cp_index == entry->_elem->name_cp_index
986 && elem->slot == entry->_elem->slot
987 ) {
988 return entry;
989 }
990 entry = entry->_next;
991 }
992 return NULL;
993 }
995 // Return false if the local variable is found in table.
996 // Return true if no duplicate is found.
997 // And local variable is added as a new entry in table.
998 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
999 // First lookup for duplicates
1000 int index = hash(elem);
1001 LVT_Hash* entry = LVT_lookup(elem, index, table);
1003 if (entry != NULL) {
1004 return false;
1005 }
1006 // No duplicate is found, allocate a new entry and fill it.
1007 if ((entry = new LVT_Hash()) == NULL) {
1008 return false;
1009 }
1010 entry->_elem = elem;
1012 // Insert into hash table
1013 entry->_next = table[index];
1014 table[index] = entry;
1016 return true;
1017 }
1019 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1020 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1021 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1022 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1023 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1024 lvt->signature_cp_index = 0;
1025 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1026 }
1028 // Function is used to parse both attributes:
1029 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1030 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1031 u2 max_locals,
1032 u4 code_attribute_length,
1033 constantPoolHandle cp,
1034 u2* localvariable_table_length,
1035 bool isLVTT,
1036 TRAPS) {
1037 ClassFileStream* cfs = stream();
1038 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1039 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1040 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1041 // Verify local variable table attribute has right length
1042 if (_need_verify) {
1043 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1044 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1045 }
1046 u2* localvariable_table_start = cfs->get_u2_buffer();
1047 assert(localvariable_table_start != NULL, "null local variable table");
1048 if (!_need_verify) {
1049 cfs->skip_u2_fast(size);
1050 } else {
1051 cfs->guarantee_more(size * 2, CHECK_NULL);
1052 for(int i = 0; i < (*localvariable_table_length); i++) {
1053 u2 start_pc = cfs->get_u2_fast();
1054 u2 length = cfs->get_u2_fast();
1055 u2 name_index = cfs->get_u2_fast();
1056 u2 descriptor_index = cfs->get_u2_fast();
1057 u2 index = cfs->get_u2_fast();
1058 // Assign to a u4 to avoid overflow
1059 u4 end_pc = (u4)start_pc + (u4)length;
1061 if (start_pc >= code_length) {
1062 classfile_parse_error(
1063 "Invalid start_pc %u in %s in class file %s",
1064 start_pc, tbl_name, CHECK_NULL);
1065 }
1066 if (end_pc > code_length) {
1067 classfile_parse_error(
1068 "Invalid length %u in %s in class file %s",
1069 length, tbl_name, CHECK_NULL);
1070 }
1071 int cp_size = cp->length();
1072 guarantee_property(
1073 valid_cp_range(name_index, cp_size) &&
1074 cp->tag_at(name_index).is_utf8(),
1075 "Name index %u in %s has bad constant type in class file %s",
1076 name_index, tbl_name, CHECK_NULL);
1077 guarantee_property(
1078 valid_cp_range(descriptor_index, cp_size) &&
1079 cp->tag_at(descriptor_index).is_utf8(),
1080 "Signature index %u in %s has bad constant type in class file %s",
1081 descriptor_index, tbl_name, CHECK_NULL);
1083 symbolHandle name(THREAD, cp->symbol_at(name_index));
1084 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1085 verify_legal_field_name(name, CHECK_NULL);
1086 u2 extra_slot = 0;
1087 if (!isLVTT) {
1088 verify_legal_field_signature(name, sig, CHECK_NULL);
1090 // 4894874: check special cases for double and long local variables
1091 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1092 sig() == vmSymbols::type_signature(T_LONG)) {
1093 extra_slot = 1;
1094 }
1095 }
1096 guarantee_property((index + extra_slot) < max_locals,
1097 "Invalid index %u in %s in class file %s",
1098 index, tbl_name, CHECK_NULL);
1099 }
1100 }
1101 return localvariable_table_start;
1102 }
1105 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1106 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1107 ClassFileStream* cfs = stream();
1108 u2 index = 0; // index in the array with long/double occupying two slots
1109 u4 i1 = *u1_index;
1110 u4 i2 = *u2_index + 1;
1111 for(int i = 0; i < array_length; i++) {
1112 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1113 index++;
1114 if (tag == ITEM_Long || tag == ITEM_Double) {
1115 index++;
1116 } else if (tag == ITEM_Object) {
1117 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1118 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1119 cp->tag_at(class_index).is_unresolved_klass(),
1120 "Bad class index %u in StackMap in class file %s",
1121 class_index, CHECK);
1122 } else if (tag == ITEM_Uninitialized) {
1123 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1124 guarantee_property(
1125 offset < code_length,
1126 "Bad uninitialized type offset %u in StackMap in class file %s",
1127 offset, CHECK);
1128 } else {
1129 guarantee_property(
1130 tag <= (u1)ITEM_Uninitialized,
1131 "Unknown variable type %u in StackMap in class file %s",
1132 tag, CHECK);
1133 }
1134 }
1135 u2_array[*u2_index] = index;
1136 *u1_index = i1;
1137 *u2_index = i2;
1138 }
1140 typeArrayOop ClassFileParser::parse_stackmap_table(
1141 u4 code_attribute_length, TRAPS) {
1142 if (code_attribute_length == 0)
1143 return NULL;
1145 ClassFileStream* cfs = stream();
1146 u1* stackmap_table_start = cfs->get_u1_buffer();
1147 assert(stackmap_table_start != NULL, "null stackmap table");
1149 // check code_attribute_length first
1150 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1152 if (!_need_verify && !DumpSharedSpaces) {
1153 return NULL;
1154 }
1156 typeArrayOop stackmap_data =
1157 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1159 stackmap_data->set_length(code_attribute_length);
1160 memcpy((void*)stackmap_data->byte_at_addr(0),
1161 (void*)stackmap_table_start, code_attribute_length);
1162 return stackmap_data;
1163 }
1165 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1166 u4 method_attribute_length,
1167 constantPoolHandle cp, TRAPS) {
1168 ClassFileStream* cfs = stream();
1169 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1170 *checked_exceptions_length = cfs->get_u2_fast();
1171 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1172 u2* checked_exceptions_start = cfs->get_u2_buffer();
1173 assert(checked_exceptions_start != NULL, "null checked exceptions");
1174 if (!_need_verify) {
1175 cfs->skip_u2_fast(size);
1176 } else {
1177 // Verify each value in the checked exception table
1178 u2 checked_exception;
1179 u2 len = *checked_exceptions_length;
1180 cfs->guarantee_more(2 * len, CHECK_NULL);
1181 for (int i = 0; i < len; i++) {
1182 checked_exception = cfs->get_u2_fast();
1183 check_property(
1184 valid_cp_range(checked_exception, cp->length()) &&
1185 cp->tag_at(checked_exception).is_klass_reference(),
1186 "Exception name has bad type at constant pool %u in class file %s",
1187 checked_exception, CHECK_NULL);
1188 }
1189 }
1190 // check exceptions attribute length
1191 if (_need_verify) {
1192 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1193 sizeof(u2) * size),
1194 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1195 }
1196 return checked_exceptions_start;
1197 }
1200 #define MAX_ARGS_SIZE 255
1201 #define MAX_CODE_SIZE 65535
1202 #define INITIAL_MAX_LVT_NUMBER 256
1204 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1205 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1206 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1207 // entire method attribute is parsed.
1208 //
1209 // The promoted_flags parameter is used to pass relevant access_flags
1210 // from the method back up to the containing klass. These flag values
1211 // are added to klass's access_flags.
1213 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1214 AccessFlags *promoted_flags,
1215 typeArrayHandle* method_annotations,
1216 typeArrayHandle* method_parameter_annotations,
1217 typeArrayHandle* method_default_annotations,
1218 TRAPS) {
1219 ClassFileStream* cfs = stream();
1220 methodHandle nullHandle;
1221 ResourceMark rm(THREAD);
1222 // Parse fixed parts
1223 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1225 int flags = cfs->get_u2_fast();
1226 u2 name_index = cfs->get_u2_fast();
1227 int cp_size = cp->length();
1228 check_property(
1229 valid_cp_range(name_index, cp_size) &&
1230 cp->tag_at(name_index).is_utf8(),
1231 "Illegal constant pool index %u for method name in class file %s",
1232 name_index, CHECK_(nullHandle));
1233 symbolHandle name(THREAD, cp->symbol_at(name_index));
1234 verify_legal_method_name(name, CHECK_(nullHandle));
1236 u2 signature_index = cfs->get_u2_fast();
1237 guarantee_property(
1238 valid_cp_range(signature_index, cp_size) &&
1239 cp->tag_at(signature_index).is_utf8(),
1240 "Illegal constant pool index %u for method signature in class file %s",
1241 signature_index, CHECK_(nullHandle));
1242 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1244 AccessFlags access_flags;
1245 if (name == vmSymbols::class_initializer_name()) {
1246 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1247 flags = JVM_ACC_STATIC;
1248 } else {
1249 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1250 }
1252 int args_size = -1; // only used when _need_verify is true
1253 if (_need_verify) {
1254 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1255 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1256 if (args_size > MAX_ARGS_SIZE) {
1257 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1258 }
1259 }
1261 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1263 // Default values for code and exceptions attribute elements
1264 u2 max_stack = 0;
1265 u2 max_locals = 0;
1266 u4 code_length = 0;
1267 u1* code_start = 0;
1268 u2 exception_table_length = 0;
1269 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1270 u2 checked_exceptions_length = 0;
1271 u2* checked_exceptions_start = NULL;
1272 CompressedLineNumberWriteStream* linenumber_table = NULL;
1273 int linenumber_table_length = 0;
1274 int total_lvt_length = 0;
1275 u2 lvt_cnt = 0;
1276 u2 lvtt_cnt = 0;
1277 bool lvt_allocated = false;
1278 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1279 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1280 u2* localvariable_table_length;
1281 u2** localvariable_table_start;
1282 u2* localvariable_type_table_length;
1283 u2** localvariable_type_table_start;
1284 bool parsed_code_attribute = false;
1285 bool parsed_checked_exceptions_attribute = false;
1286 bool parsed_stackmap_attribute = false;
1287 // stackmap attribute - JDK1.5
1288 typeArrayHandle stackmap_data;
1289 u2 generic_signature_index = 0;
1290 u1* runtime_visible_annotations = NULL;
1291 int runtime_visible_annotations_length = 0;
1292 u1* runtime_invisible_annotations = NULL;
1293 int runtime_invisible_annotations_length = 0;
1294 u1* runtime_visible_parameter_annotations = NULL;
1295 int runtime_visible_parameter_annotations_length = 0;
1296 u1* runtime_invisible_parameter_annotations = NULL;
1297 int runtime_invisible_parameter_annotations_length = 0;
1298 u1* annotation_default = NULL;
1299 int annotation_default_length = 0;
1301 // Parse code and exceptions attribute
1302 u2 method_attributes_count = cfs->get_u2_fast();
1303 while (method_attributes_count--) {
1304 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1305 u2 method_attribute_name_index = cfs->get_u2_fast();
1306 u4 method_attribute_length = cfs->get_u4_fast();
1307 check_property(
1308 valid_cp_range(method_attribute_name_index, cp_size) &&
1309 cp->tag_at(method_attribute_name_index).is_utf8(),
1310 "Invalid method attribute name index %u in class file %s",
1311 method_attribute_name_index, CHECK_(nullHandle));
1313 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1314 if (method_attribute_name == vmSymbols::tag_code()) {
1315 // Parse Code attribute
1316 if (_need_verify) {
1317 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1318 "Code attribute in native or abstract methods in class file %s",
1319 CHECK_(nullHandle));
1320 }
1321 if (parsed_code_attribute) {
1322 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1323 }
1324 parsed_code_attribute = true;
1326 // Stack size, locals size, and code size
1327 if (_major_version == 45 && _minor_version <= 2) {
1328 cfs->guarantee_more(4, CHECK_(nullHandle));
1329 max_stack = cfs->get_u1_fast();
1330 max_locals = cfs->get_u1_fast();
1331 code_length = cfs->get_u2_fast();
1332 } else {
1333 cfs->guarantee_more(8, CHECK_(nullHandle));
1334 max_stack = cfs->get_u2_fast();
1335 max_locals = cfs->get_u2_fast();
1336 code_length = cfs->get_u4_fast();
1337 }
1338 if (_need_verify) {
1339 guarantee_property(args_size <= max_locals,
1340 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1341 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1342 "Invalid method Code length %u in class file %s",
1343 code_length, CHECK_(nullHandle));
1344 }
1345 // Code pointer
1346 code_start = cfs->get_u1_buffer();
1347 assert(code_start != NULL, "null code start");
1348 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1349 cfs->skip_u1_fast(code_length);
1351 // Exception handler table
1352 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1353 exception_table_length = cfs->get_u2_fast();
1354 if (exception_table_length > 0) {
1355 exception_handlers =
1356 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1357 }
1359 // Parse additional attributes in code attribute
1360 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1361 u2 code_attributes_count = cfs->get_u2_fast();
1363 unsigned int calculated_attribute_length = 0;
1365 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1366 calculated_attribute_length =
1367 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1368 } else {
1369 // max_stack, locals and length are smaller in pre-version 45.2 classes
1370 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1371 }
1372 calculated_attribute_length +=
1373 code_length +
1374 sizeof(exception_table_length) +
1375 sizeof(code_attributes_count) +
1376 exception_table_length *
1377 ( sizeof(u2) + // start_pc
1378 sizeof(u2) + // end_pc
1379 sizeof(u2) + // handler_pc
1380 sizeof(u2) ); // catch_type_index
1382 while (code_attributes_count--) {
1383 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1384 u2 code_attribute_name_index = cfs->get_u2_fast();
1385 u4 code_attribute_length = cfs->get_u4_fast();
1386 calculated_attribute_length += code_attribute_length +
1387 sizeof(code_attribute_name_index) +
1388 sizeof(code_attribute_length);
1389 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1390 cp->tag_at(code_attribute_name_index).is_utf8(),
1391 "Invalid code attribute name index %u in class file %s",
1392 code_attribute_name_index,
1393 CHECK_(nullHandle));
1394 if (LoadLineNumberTables &&
1395 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1396 // Parse and compress line number table
1397 parse_linenumber_table(code_attribute_length, code_length,
1398 &linenumber_table, CHECK_(nullHandle));
1400 } else if (LoadLocalVariableTables &&
1401 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1402 // Parse local variable table
1403 if (!lvt_allocated) {
1404 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1405 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1406 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1407 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1408 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1409 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1410 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1411 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1412 lvt_allocated = true;
1413 }
1414 if (lvt_cnt == max_lvt_cnt) {
1415 max_lvt_cnt <<= 1;
1416 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1417 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1418 }
1419 localvariable_table_start[lvt_cnt] =
1420 parse_localvariable_table(code_length,
1421 max_locals,
1422 code_attribute_length,
1423 cp,
1424 &localvariable_table_length[lvt_cnt],
1425 false, // is not LVTT
1426 CHECK_(nullHandle));
1427 total_lvt_length += localvariable_table_length[lvt_cnt];
1428 lvt_cnt++;
1429 } else if (LoadLocalVariableTypeTables &&
1430 _major_version >= JAVA_1_5_VERSION &&
1431 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1432 if (!lvt_allocated) {
1433 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1434 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1435 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1436 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1437 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1438 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1439 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1440 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1441 lvt_allocated = true;
1442 }
1443 // Parse local variable type table
1444 if (lvtt_cnt == max_lvtt_cnt) {
1445 max_lvtt_cnt <<= 1;
1446 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1447 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1448 }
1449 localvariable_type_table_start[lvtt_cnt] =
1450 parse_localvariable_table(code_length,
1451 max_locals,
1452 code_attribute_length,
1453 cp,
1454 &localvariable_type_table_length[lvtt_cnt],
1455 true, // is LVTT
1456 CHECK_(nullHandle));
1457 lvtt_cnt++;
1458 } else if (UseSplitVerifier &&
1459 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1460 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1461 // Stack map is only needed by the new verifier in JDK1.5.
1462 if (parsed_stackmap_attribute) {
1463 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1464 }
1465 typeArrayOop sm =
1466 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1467 stackmap_data = typeArrayHandle(THREAD, sm);
1468 parsed_stackmap_attribute = true;
1469 } else {
1470 // Skip unknown attributes
1471 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1472 }
1473 }
1474 // check method attribute length
1475 if (_need_verify) {
1476 guarantee_property(method_attribute_length == calculated_attribute_length,
1477 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1478 }
1479 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1480 // Parse Exceptions attribute
1481 if (parsed_checked_exceptions_attribute) {
1482 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1483 }
1484 parsed_checked_exceptions_attribute = true;
1485 checked_exceptions_start =
1486 parse_checked_exceptions(&checked_exceptions_length,
1487 method_attribute_length,
1488 cp, CHECK_(nullHandle));
1489 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1490 if (method_attribute_length != 0) {
1491 classfile_parse_error(
1492 "Invalid Synthetic method attribute length %u in class file %s",
1493 method_attribute_length, CHECK_(nullHandle));
1494 }
1495 // Should we check that there hasn't already been a synthetic attribute?
1496 access_flags.set_is_synthetic();
1497 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1498 if (method_attribute_length != 0) {
1499 classfile_parse_error(
1500 "Invalid Deprecated method attribute length %u in class file %s",
1501 method_attribute_length, CHECK_(nullHandle));
1502 }
1503 } else if (_major_version >= JAVA_1_5_VERSION) {
1504 if (method_attribute_name == vmSymbols::tag_signature()) {
1505 if (method_attribute_length != 2) {
1506 classfile_parse_error(
1507 "Invalid Signature attribute length %u in class file %s",
1508 method_attribute_length, CHECK_(nullHandle));
1509 }
1510 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1511 generic_signature_index = cfs->get_u2_fast();
1512 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1513 runtime_visible_annotations_length = method_attribute_length;
1514 runtime_visible_annotations = cfs->get_u1_buffer();
1515 assert(runtime_visible_annotations != NULL, "null visible annotations");
1516 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1517 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1518 runtime_invisible_annotations_length = method_attribute_length;
1519 runtime_invisible_annotations = cfs->get_u1_buffer();
1520 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1521 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1522 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1523 runtime_visible_parameter_annotations_length = method_attribute_length;
1524 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1525 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1526 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1527 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1528 runtime_invisible_parameter_annotations_length = method_attribute_length;
1529 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1530 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1531 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1532 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1533 annotation_default_length = method_attribute_length;
1534 annotation_default = cfs->get_u1_buffer();
1535 assert(annotation_default != NULL, "null annotation default");
1536 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1537 } else {
1538 // Skip unknown attributes
1539 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1540 }
1541 } else {
1542 // Skip unknown attributes
1543 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1544 }
1545 }
1547 if (linenumber_table != NULL) {
1548 linenumber_table->write_terminator();
1549 linenumber_table_length = linenumber_table->position();
1550 }
1552 // Make sure there's at least one Code attribute in non-native/non-abstract method
1553 if (_need_verify) {
1554 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1555 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1556 }
1558 // All sizing information for a methodOop is finally available, now create it
1559 methodOop m_oop = oopFactory::new_method(
1560 code_length, access_flags, linenumber_table_length,
1561 total_lvt_length, checked_exceptions_length, CHECK_(nullHandle));
1562 methodHandle m (THREAD, m_oop);
1564 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1566 // Fill in information from fixed part (access_flags already set)
1567 m->set_constants(cp());
1568 m->set_name_index(name_index);
1569 m->set_signature_index(signature_index);
1570 m->set_generic_signature_index(generic_signature_index);
1571 #ifdef CC_INTERP
1572 // hmm is there a gc issue here??
1573 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1574 m->set_result_index(rtf.type());
1575 #endif
1577 if (args_size >= 0) {
1578 m->set_size_of_parameters(args_size);
1579 } else {
1580 m->compute_size_of_parameters(THREAD);
1581 }
1582 #ifdef ASSERT
1583 if (args_size >= 0) {
1584 m->compute_size_of_parameters(THREAD);
1585 assert(args_size == m->size_of_parameters(), "");
1586 }
1587 #endif
1589 // Fill in code attribute information
1590 m->set_max_stack(max_stack);
1591 m->set_max_locals(max_locals);
1592 m->constMethod()->set_stackmap_data(stackmap_data());
1594 /**
1595 * The exception_table field is the flag used to indicate
1596 * that the methodOop and it's associated constMethodOop are partially
1597 * initialized and thus are exempt from pre/post GC verification. Once
1598 * the field is set, the oops are considered fully initialized so make
1599 * sure that the oops can pass verification when this field is set.
1600 */
1601 m->set_exception_table(exception_handlers());
1603 // Copy byte codes
1604 if (code_length > 0) {
1605 memcpy(m->code_base(), code_start, code_length);
1606 }
1608 // Copy line number table
1609 if (linenumber_table != NULL) {
1610 memcpy(m->compressed_linenumber_table(),
1611 linenumber_table->buffer(), linenumber_table_length);
1612 }
1614 // Copy checked exceptions
1615 if (checked_exceptions_length > 0) {
1616 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1617 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1618 }
1620 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1621 *
1622 * Rules for LVT's and LVTT's are:
1623 * - There can be any number of LVT's and LVTT's.
1624 * - If there are n LVT's, it is the same as if there was just
1625 * one LVT containing all the entries from the n LVT's.
1626 * - There may be no more than one LVT entry per local variable.
1627 * Two LVT entries are 'equal' if these fields are the same:
1628 * start_pc, length, name, slot
1629 * - There may be no more than one LVTT entry per each LVT entry.
1630 * Each LVTT entry has to match some LVT entry.
1631 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1632 */
1633 if (total_lvt_length > 0) {
1634 int tbl_no, idx;
1636 promoted_flags->set_has_localvariable_table();
1638 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1639 initialize_hashtable(lvt_Hash);
1641 // To fill LocalVariableTable in
1642 Classfile_LVT_Element* cf_lvt;
1643 LocalVariableTableElement* lvt = m->localvariable_table_start();
1645 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1646 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1647 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1648 copy_lvt_element(&cf_lvt[idx], lvt);
1649 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1650 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1651 && _need_verify
1652 && _major_version >= JAVA_1_5_VERSION ) {
1653 clear_hashtable(lvt_Hash);
1654 classfile_parse_error("Duplicated LocalVariableTable attribute "
1655 "entry for '%s' in class file %s",
1656 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1657 CHECK_(nullHandle));
1658 }
1659 }
1660 }
1662 // To merge LocalVariableTable and LocalVariableTypeTable
1663 Classfile_LVT_Element* cf_lvtt;
1664 LocalVariableTableElement lvtt_elem;
1666 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1667 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1668 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1669 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1670 int index = hash(&lvtt_elem);
1671 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1672 if (entry == NULL) {
1673 if (_need_verify) {
1674 clear_hashtable(lvt_Hash);
1675 classfile_parse_error("LVTT entry for '%s' in class file %s "
1676 "does not match any LVT entry",
1677 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1678 CHECK_(nullHandle));
1679 }
1680 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1681 clear_hashtable(lvt_Hash);
1682 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1683 "entry for '%s' in class file %s",
1684 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1685 CHECK_(nullHandle));
1686 } else {
1687 // to add generic signatures into LocalVariableTable
1688 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1689 }
1690 }
1691 }
1692 clear_hashtable(lvt_Hash);
1693 }
1695 *method_annotations = assemble_annotations(runtime_visible_annotations,
1696 runtime_visible_annotations_length,
1697 runtime_invisible_annotations,
1698 runtime_invisible_annotations_length,
1699 CHECK_(nullHandle));
1700 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1701 runtime_visible_parameter_annotations_length,
1702 runtime_invisible_parameter_annotations,
1703 runtime_invisible_parameter_annotations_length,
1704 CHECK_(nullHandle));
1705 *method_default_annotations = assemble_annotations(annotation_default,
1706 annotation_default_length,
1707 NULL,
1708 0,
1709 CHECK_(nullHandle));
1711 if (name() == vmSymbols::finalize_method_name() &&
1712 signature() == vmSymbols::void_method_signature()) {
1713 if (m->is_empty_method()) {
1714 _has_empty_finalizer = true;
1715 } else {
1716 _has_finalizer = true;
1717 }
1718 }
1719 if (name() == vmSymbols::object_initializer_name() &&
1720 signature() == vmSymbols::void_method_signature() &&
1721 m->is_vanilla_constructor()) {
1722 _has_vanilla_constructor = true;
1723 }
1725 return m;
1726 }
1729 // The promoted_flags parameter is used to pass relevant access_flags
1730 // from the methods back up to the containing klass. These flag values
1731 // are added to klass's access_flags.
1733 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1734 AccessFlags* promoted_flags,
1735 bool* has_final_method,
1736 objArrayOop* methods_annotations_oop,
1737 objArrayOop* methods_parameter_annotations_oop,
1738 objArrayOop* methods_default_annotations_oop,
1739 TRAPS) {
1740 ClassFileStream* cfs = stream();
1741 objArrayHandle nullHandle;
1742 typeArrayHandle method_annotations;
1743 typeArrayHandle method_parameter_annotations;
1744 typeArrayHandle method_default_annotations;
1745 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1746 u2 length = cfs->get_u2_fast();
1747 if (length == 0) {
1748 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1749 } else {
1750 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1751 objArrayHandle methods(THREAD, m);
1752 HandleMark hm(THREAD);
1753 objArrayHandle methods_annotations;
1754 objArrayHandle methods_parameter_annotations;
1755 objArrayHandle methods_default_annotations;
1756 for (int index = 0; index < length; index++) {
1757 methodHandle method = parse_method(cp, is_interface,
1758 promoted_flags,
1759 &method_annotations,
1760 &method_parameter_annotations,
1761 &method_default_annotations,
1762 CHECK_(nullHandle));
1763 if (method->is_final()) {
1764 *has_final_method = true;
1765 }
1766 methods->obj_at_put(index, method());
1767 if (method_annotations.not_null()) {
1768 if (methods_annotations.is_null()) {
1769 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1770 methods_annotations = objArrayHandle(THREAD, md);
1771 }
1772 methods_annotations->obj_at_put(index, method_annotations());
1773 }
1774 if (method_parameter_annotations.not_null()) {
1775 if (methods_parameter_annotations.is_null()) {
1776 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1777 methods_parameter_annotations = objArrayHandle(THREAD, md);
1778 }
1779 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1780 }
1781 if (method_default_annotations.not_null()) {
1782 if (methods_default_annotations.is_null()) {
1783 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1784 methods_default_annotations = objArrayHandle(THREAD, md);
1785 }
1786 methods_default_annotations->obj_at_put(index, method_default_annotations());
1787 }
1788 }
1789 if (_need_verify && length > 1) {
1790 // Check duplicated methods
1791 ResourceMark rm(THREAD);
1792 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1793 THREAD, NameSigHash*, HASH_ROW_SIZE);
1794 initialize_hashtable(names_and_sigs);
1795 bool dup = false;
1796 {
1797 debug_only(No_Safepoint_Verifier nsv;)
1798 for (int i = 0; i < length; i++) {
1799 methodOop m = (methodOop)methods->obj_at(i);
1800 // If no duplicates, add name/signature in hashtable names_and_sigs.
1801 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1802 dup = true;
1803 break;
1804 }
1805 }
1806 }
1807 if (dup) {
1808 classfile_parse_error("Duplicate method name&signature in class file %s",
1809 CHECK_(nullHandle));
1810 }
1811 }
1813 *methods_annotations_oop = methods_annotations();
1814 *methods_parameter_annotations_oop = methods_parameter_annotations();
1815 *methods_default_annotations_oop = methods_default_annotations();
1817 return methods;
1818 }
1819 }
1822 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1823 objArrayHandle methods_annotations,
1824 objArrayHandle methods_parameter_annotations,
1825 objArrayHandle methods_default_annotations,
1826 TRAPS) {
1827 typeArrayHandle nullHandle;
1828 int length = methods()->length();
1829 // If JVMTI original method ordering is enabled we have to
1830 // remember the original class file ordering.
1831 // We temporarily use the vtable_index field in the methodOop to store the
1832 // class file index, so we can read in after calling qsort.
1833 if (JvmtiExport::can_maintain_original_method_order()) {
1834 for (int index = 0; index < length; index++) {
1835 methodOop m = methodOop(methods->obj_at(index));
1836 assert(!m->valid_vtable_index(), "vtable index should not be set");
1837 m->set_vtable_index(index);
1838 }
1839 }
1840 // Sort method array by ascending method name (for faster lookups & vtable construction)
1841 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1842 methodOopDesc::sort_methods(methods(),
1843 methods_annotations(),
1844 methods_parameter_annotations(),
1845 methods_default_annotations());
1847 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1848 if (JvmtiExport::can_maintain_original_method_order()) {
1849 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1850 typeArrayHandle method_ordering(THREAD, new_ordering);
1851 for (int index = 0; index < length; index++) {
1852 methodOop m = methodOop(methods->obj_at(index));
1853 int old_index = m->vtable_index();
1854 assert(old_index >= 0 && old_index < length, "invalid method index");
1855 method_ordering->int_at_put(index, old_index);
1856 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1857 }
1858 return method_ordering;
1859 } else {
1860 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1861 }
1862 }
1865 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1866 ClassFileStream* cfs = stream();
1867 cfs->guarantee_more(2, CHECK); // sourcefile_index
1868 u2 sourcefile_index = cfs->get_u2_fast();
1869 check_property(
1870 valid_cp_range(sourcefile_index, cp->length()) &&
1871 cp->tag_at(sourcefile_index).is_utf8(),
1872 "Invalid SourceFile attribute at constant pool index %u in class file %s",
1873 sourcefile_index, CHECK);
1874 k->set_source_file_name(cp->symbol_at(sourcefile_index));
1875 }
1879 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
1880 instanceKlassHandle k,
1881 int length, TRAPS) {
1882 ClassFileStream* cfs = stream();
1883 u1* sde_buffer = cfs->get_u1_buffer();
1884 assert(sde_buffer != NULL, "null sde buffer");
1886 // Don't bother storing it if there is no way to retrieve it
1887 if (JvmtiExport::can_get_source_debug_extension()) {
1888 // Optimistically assume that only 1 byte UTF format is used
1889 // (common case)
1890 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
1891 length, CHECK);
1892 k->set_source_debug_extension(sde_symbol);
1893 }
1894 // Got utf8 string, set stream position forward
1895 cfs->skip_u1(length, CHECK);
1896 }
1899 // Inner classes can be static, private or protected (classic VM does this)
1900 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
1902 // Return number of classes in the inner classes attribute table
1903 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1904 ClassFileStream* cfs = stream();
1905 cfs->guarantee_more(2, CHECK_0); // length
1906 u2 length = cfs->get_u2_fast();
1908 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
1909 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
1910 typeArrayHandle inner_classes(THREAD, ic);
1911 int index = 0;
1912 int cp_size = cp->length();
1913 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
1914 for (int n = 0; n < length; n++) {
1915 // Inner class index
1916 u2 inner_class_info_index = cfs->get_u2_fast();
1917 check_property(
1918 inner_class_info_index == 0 ||
1919 (valid_cp_range(inner_class_info_index, cp_size) &&
1920 cp->tag_at(inner_class_info_index).is_klass_reference()),
1921 "inner_class_info_index %u has bad constant type in class file %s",
1922 inner_class_info_index, CHECK_0);
1923 // Outer class index
1924 u2 outer_class_info_index = cfs->get_u2_fast();
1925 check_property(
1926 outer_class_info_index == 0 ||
1927 (valid_cp_range(outer_class_info_index, cp_size) &&
1928 cp->tag_at(outer_class_info_index).is_klass_reference()),
1929 "outer_class_info_index %u has bad constant type in class file %s",
1930 outer_class_info_index, CHECK_0);
1931 // Inner class name
1932 u2 inner_name_index = cfs->get_u2_fast();
1933 check_property(
1934 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
1935 cp->tag_at(inner_name_index).is_utf8()),
1936 "inner_name_index %u has bad constant type in class file %s",
1937 inner_name_index, CHECK_0);
1938 if (_need_verify) {
1939 guarantee_property(inner_class_info_index != outer_class_info_index,
1940 "Class is both outer and inner class in class file %s", CHECK_0);
1941 }
1942 // Access flags
1943 AccessFlags inner_access_flags;
1944 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
1945 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
1946 // Set abstract bit for old class files for backward compatibility
1947 flags |= JVM_ACC_ABSTRACT;
1948 }
1949 verify_legal_class_modifiers(flags, CHECK_0);
1950 inner_access_flags.set_flags(flags);
1952 inner_classes->short_at_put(index++, inner_class_info_index);
1953 inner_classes->short_at_put(index++, outer_class_info_index);
1954 inner_classes->short_at_put(index++, inner_name_index);
1955 inner_classes->short_at_put(index++, inner_access_flags.as_short());
1956 }
1958 // 4347400: make sure there's no duplicate entry in the classes array
1959 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
1960 for(int i = 0; i < inner_classes->length(); i += 4) {
1961 for(int j = i + 4; j < inner_classes->length(); j += 4) {
1962 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
1963 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
1964 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
1965 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
1966 "Duplicate entry in InnerClasses in class file %s",
1967 CHECK_0);
1968 }
1969 }
1970 }
1972 // Update instanceKlass with inner class info.
1973 k->set_inner_classes(inner_classes());
1974 return length;
1975 }
1977 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1978 k->set_is_synthetic();
1979 }
1981 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1982 ClassFileStream* cfs = stream();
1983 u2 signature_index = cfs->get_u2(CHECK);
1984 check_property(
1985 valid_cp_range(signature_index, cp->length()) &&
1986 cp->tag_at(signature_index).is_utf8(),
1987 "Invalid constant pool index %u in Signature attribute in class file %s",
1988 signature_index, CHECK);
1989 k->set_generic_signature(cp->symbol_at(signature_index));
1990 }
1992 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1993 ClassFileStream* cfs = stream();
1994 // Set inner classes attribute to default sentinel
1995 k->set_inner_classes(Universe::the_empty_short_array());
1996 cfs->guarantee_more(2, CHECK); // attributes_count
1997 u2 attributes_count = cfs->get_u2_fast();
1998 bool parsed_sourcefile_attribute = false;
1999 bool parsed_innerclasses_attribute = false;
2000 bool parsed_enclosingmethod_attribute = false;
2001 u1* runtime_visible_annotations = NULL;
2002 int runtime_visible_annotations_length = 0;
2003 u1* runtime_invisible_annotations = NULL;
2004 int runtime_invisible_annotations_length = 0;
2005 // Iterate over attributes
2006 while (attributes_count--) {
2007 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2008 u2 attribute_name_index = cfs->get_u2_fast();
2009 u4 attribute_length = cfs->get_u4_fast();
2010 check_property(
2011 valid_cp_range(attribute_name_index, cp->length()) &&
2012 cp->tag_at(attribute_name_index).is_utf8(),
2013 "Attribute name has bad constant pool index %u in class file %s",
2014 attribute_name_index, CHECK);
2015 symbolOop tag = cp->symbol_at(attribute_name_index);
2016 if (tag == vmSymbols::tag_source_file()) {
2017 // Check for SourceFile tag
2018 if (_need_verify) {
2019 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2020 }
2021 if (parsed_sourcefile_attribute) {
2022 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2023 } else {
2024 parsed_sourcefile_attribute = true;
2025 }
2026 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2027 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2028 // Check for SourceDebugExtension tag
2029 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2030 } else if (tag == vmSymbols::tag_inner_classes()) {
2031 // Check for InnerClasses tag
2032 if (parsed_innerclasses_attribute) {
2033 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2034 } else {
2035 parsed_innerclasses_attribute = true;
2036 }
2037 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2038 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2039 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2040 "Wrong InnerClasses attribute length in class file %s", CHECK);
2041 }
2042 } else if (tag == vmSymbols::tag_synthetic()) {
2043 // Check for Synthetic tag
2044 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2045 if (attribute_length != 0) {
2046 classfile_parse_error(
2047 "Invalid Synthetic classfile attribute length %u in class file %s",
2048 attribute_length, CHECK);
2049 }
2050 parse_classfile_synthetic_attribute(cp, k, CHECK);
2051 } else if (tag == vmSymbols::tag_deprecated()) {
2052 // Check for Deprecatd tag - 4276120
2053 if (attribute_length != 0) {
2054 classfile_parse_error(
2055 "Invalid Deprecated classfile attribute length %u in class file %s",
2056 attribute_length, CHECK);
2057 }
2058 } else if (_major_version >= JAVA_1_5_VERSION) {
2059 if (tag == vmSymbols::tag_signature()) {
2060 if (attribute_length != 2) {
2061 classfile_parse_error(
2062 "Wrong Signature attribute length %u in class file %s",
2063 attribute_length, CHECK);
2064 }
2065 parse_classfile_signature_attribute(cp, k, CHECK);
2066 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2067 runtime_visible_annotations_length = attribute_length;
2068 runtime_visible_annotations = cfs->get_u1_buffer();
2069 assert(runtime_visible_annotations != NULL, "null visible annotations");
2070 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2071 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2072 runtime_invisible_annotations_length = attribute_length;
2073 runtime_invisible_annotations = cfs->get_u1_buffer();
2074 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2075 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2076 } else if (tag == vmSymbols::tag_enclosing_method()) {
2077 if (parsed_enclosingmethod_attribute) {
2078 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2079 } else {
2080 parsed_enclosingmethod_attribute = true;
2081 }
2082 cfs->guarantee_more(4, CHECK); // class_index, method_index
2083 u2 class_index = cfs->get_u2_fast();
2084 u2 method_index = cfs->get_u2_fast();
2085 if (class_index == 0) {
2086 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2087 }
2088 // Validate the constant pool indices and types
2089 if (!cp->is_within_bounds(class_index) ||
2090 !cp->tag_at(class_index).is_klass_reference()) {
2091 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2092 }
2093 if (method_index != 0 &&
2094 (!cp->is_within_bounds(method_index) ||
2095 !cp->tag_at(method_index).is_name_and_type())) {
2096 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2097 }
2098 k->set_enclosing_method_indices(class_index, method_index);
2099 } else {
2100 // Unknown attribute
2101 cfs->skip_u1(attribute_length, CHECK);
2102 }
2103 } else {
2104 // Unknown attribute
2105 cfs->skip_u1(attribute_length, CHECK);
2106 }
2107 }
2108 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2109 runtime_visible_annotations_length,
2110 runtime_invisible_annotations,
2111 runtime_invisible_annotations_length,
2112 CHECK);
2113 k->set_class_annotations(annotations());
2114 }
2117 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2118 int runtime_visible_annotations_length,
2119 u1* runtime_invisible_annotations,
2120 int runtime_invisible_annotations_length, TRAPS) {
2121 typeArrayHandle annotations;
2122 if (runtime_visible_annotations != NULL ||
2123 runtime_invisible_annotations != NULL) {
2124 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2125 runtime_invisible_annotations_length, CHECK_(annotations));
2126 annotations = typeArrayHandle(THREAD, anno);
2127 if (runtime_visible_annotations != NULL) {
2128 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2129 }
2130 if (runtime_invisible_annotations != NULL) {
2131 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2132 }
2133 }
2134 return annotations;
2135 }
2138 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2139 KlassHandle h_k (THREAD, fd->field_holder());
2140 assert(h_k.not_null() && fd->is_static(), "just checking");
2141 if (fd->has_initial_value()) {
2142 BasicType t = fd->field_type();
2143 switch (t) {
2144 case T_BYTE:
2145 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2146 break;
2147 case T_BOOLEAN:
2148 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2149 break;
2150 case T_CHAR:
2151 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2152 break;
2153 case T_SHORT:
2154 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2155 break;
2156 case T_INT:
2157 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2158 break;
2159 case T_FLOAT:
2160 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2161 break;
2162 case T_DOUBLE:
2163 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2164 break;
2165 case T_LONG:
2166 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2167 break;
2168 case T_OBJECT:
2169 {
2170 #ifdef ASSERT
2171 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2172 assert(fd->signature() == sym, "just checking");
2173 #endif
2174 oop string = fd->string_initial_value(CHECK);
2175 h_k()->obj_field_put(fd->offset(), string);
2176 }
2177 break;
2178 default:
2179 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2180 "Illegal ConstantValue attribute in class file");
2181 }
2182 }
2183 }
2186 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2187 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2188 // This code is for compatibility with earlier jdk's that do not
2189 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2190 // the check for the "discovered" field should issue a warning if
2191 // the field is not found. For 1.6 this code should be issue a
2192 // fatal error if the "discovered" field is not found.
2193 //
2194 // Increment fac.nonstatic_oop_count so that the start of the
2195 // next type of non-static oops leaves room for the fake oop.
2196 // Do not increment next_nonstatic_oop_offset so that the
2197 // fake oop is place after the java.lang.ref.Reference oop
2198 // fields.
2199 //
2200 // Check the fields in java.lang.ref.Reference for the "discovered"
2201 // field. If it is not present, artifically create a field for it.
2202 // This allows this VM to run on early JDK where the field is not
2203 // present.
2205 //
2206 // Increment fac.nonstatic_oop_count so that the start of the
2207 // next type of non-static oops leaves room for the fake oop.
2208 // Do not increment next_nonstatic_oop_offset so that the
2209 // fake oop is place after the java.lang.ref.Reference oop
2210 // fields.
2211 //
2212 // Check the fields in java.lang.ref.Reference for the "discovered"
2213 // field. If it is not present, artifically create a field for it.
2214 // This allows this VM to run on early JDK where the field is not
2215 // present.
2216 int reference_sig_index = 0;
2217 int reference_name_index = 0;
2218 int reference_index = 0;
2219 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2220 const int n = (*fields_ptr)()->length();
2221 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2222 int name_index =
2223 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2224 int sig_index =
2225 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2226 symbolOop f_name = cp->symbol_at(name_index);
2227 symbolOop f_sig = cp->symbol_at(sig_index);
2228 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2229 // Save the index for reference signature for later use.
2230 // The fake discovered field does not entries in the
2231 // constant pool so the index for its signature cannot
2232 // be extracted from the constant pool. It will need
2233 // later, however. It's signature is vmSymbols::reference_signature()
2234 // so same an index for that signature.
2235 reference_sig_index = sig_index;
2236 reference_name_index = name_index;
2237 reference_index = i;
2238 }
2239 if (f_name == vmSymbols::reference_discovered_name() &&
2240 f_sig == vmSymbols::reference_signature()) {
2241 // The values below are fake but will force extra
2242 // non-static oop fields and a corresponding non-static
2243 // oop map block to be allocated.
2244 extra = 0;
2245 break;
2246 }
2247 }
2248 if (extra != 0) {
2249 fac_ptr->nonstatic_oop_count += extra;
2250 // Add the additional entry to "fields" so that the klass
2251 // contains the "discoverd" field and the field will be initialized
2252 // in instances of the object.
2253 int fields_with_fix_length = (*fields_ptr)()->length() +
2254 instanceKlass::next_offset;
2255 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2256 fields_with_fix_length, CHECK);
2257 typeArrayHandle fields_with_fix(THREAD, ff);
2259 // Take everything from the original but the length.
2260 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2261 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2262 }
2264 // Add the fake field at the end.
2265 int i = (*fields_ptr)->length();
2266 // There is no name index for the fake "discovered" field nor
2267 // signature but a signature is needed so that the field will
2268 // be properly initialized. Use one found for
2269 // one of the other reference fields. Be sure the index for the
2270 // name is 0. In fieldDescriptor::initialize() the index of the
2271 // name is checked. That check is by passed for the last nonstatic
2272 // oop field in a java.lang.ref.Reference which is assumed to be
2273 // this artificial "discovered" field. An assertion checks that
2274 // the name index is 0.
2275 assert(reference_index != 0, "Missing signature for reference");
2277 int j;
2278 for (j = 0; j < instanceKlass::next_offset; j++) {
2279 fields_with_fix->ushort_at_put(i + j,
2280 (*fields_ptr)->ushort_at(reference_index +j));
2281 }
2282 // Clear the public access flag and set the private access flag.
2283 short flags;
2284 flags =
2285 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2286 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2287 flags = flags & (~JVM_ACC_PUBLIC);
2288 flags = flags | JVM_ACC_PRIVATE;
2289 AccessFlags access_flags;
2290 access_flags.set_flags(flags);
2291 assert(!access_flags.is_public(), "Failed to clear public flag");
2292 assert(access_flags.is_private(), "Failed to set private flag");
2293 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2294 flags);
2296 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2297 == reference_name_index, "The fake reference name is incorrect");
2298 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2299 == reference_sig_index, "The fake reference signature is incorrect");
2300 // The type of the field is stored in the low_offset entry during
2301 // parsing.
2302 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2303 NONSTATIC_OOP, "The fake reference type is incorrect");
2305 // "fields" is allocated in the permanent generation. Disgard
2306 // it and let it be collected.
2307 (*fields_ptr) = fields_with_fix;
2308 }
2309 return;
2310 }
2313 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2314 FieldAllocationCount *fac_ptr, TRAPS) {
2315 // Add fake fields for java.lang.Class instances
2316 //
2317 // This is not particularly nice. We should consider adding a
2318 // private transient object field at the Java level to
2319 // java.lang.Class. Alternatively we could add a subclass of
2320 // instanceKlass which provides an accessor and size computer for
2321 // this field, but that appears to be more code than this hack.
2322 //
2323 // NOTE that we wedge these in at the beginning rather than the
2324 // end of the object because the Class layout changed between JDK
2325 // 1.3 and JDK 1.4 with the new reflection implementation; some
2326 // nonstatic oop fields were added at the Java level. The offsets
2327 // of these fake fields can't change between these two JDK
2328 // versions because when the offsets are computed at bootstrap
2329 // time we don't know yet which version of the JDK we're running in.
2331 // The values below are fake but will force two non-static oop fields and
2332 // a corresponding non-static oop map block to be allocated.
2333 const int extra = java_lang_Class::number_of_fake_oop_fields;
2334 fac_ptr->nonstatic_oop_count += extra;
2335 }
2338 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2339 // Cause the extra fake fields in java.lang.Class to show up before
2340 // the Java fields for layout compatibility between 1.3 and 1.4
2341 // Incrementing next_nonstatic_oop_offset here advances the
2342 // location where the real java fields are placed.
2343 const int extra = java_lang_Class::number_of_fake_oop_fields;
2344 (*next_nonstatic_oop_offset_ptr) += (extra * wordSize);
2345 }
2348 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2349 Handle class_loader,
2350 Handle protection_domain,
2351 symbolHandle& parsed_name,
2352 TRAPS) {
2353 // So that JVMTI can cache class file in the state before retransformable agents
2354 // have modified it
2355 unsigned char *cached_class_file_bytes = NULL;
2356 jint cached_class_file_length;
2358 ClassFileStream* cfs = stream();
2359 // Timing
2360 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time());
2362 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2364 if (JvmtiExport::should_post_class_file_load_hook()) {
2365 unsigned char* ptr = cfs->buffer();
2366 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2368 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2369 &ptr, &end_ptr,
2370 &cached_class_file_bytes,
2371 &cached_class_file_length);
2373 if (ptr != cfs->buffer()) {
2374 // JVMTI agent has modified class file data.
2375 // Set new class file stream using JVMTI agent modified
2376 // class file data.
2377 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2378 set_stream(cfs);
2379 }
2380 }
2383 instanceKlassHandle nullHandle;
2385 // Figure out whether we can skip format checking (matching classic VM behavior)
2386 _need_verify = Verifier::should_verify_for(class_loader());
2388 // Set the verify flag in stream
2389 cfs->set_verify(_need_verify);
2391 // Save the class file name for easier error message printing.
2392 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2394 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2395 // Magic value
2396 u4 magic = cfs->get_u4_fast();
2397 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2398 "Incompatible magic value %u in class file %s",
2399 magic, CHECK_(nullHandle));
2401 // Version numbers
2402 u2 minor_version = cfs->get_u2_fast();
2403 u2 major_version = cfs->get_u2_fast();
2405 // Check version numbers - we check this even with verifier off
2406 if (!is_supported_version(major_version, minor_version)) {
2407 if (name.is_null()) {
2408 Exceptions::fthrow(
2409 THREAD_AND_LOCATION,
2410 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2411 "Unsupported major.minor version %u.%u",
2412 major_version,
2413 minor_version);
2414 } else {
2415 ResourceMark rm(THREAD);
2416 Exceptions::fthrow(
2417 THREAD_AND_LOCATION,
2418 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2419 "%s : Unsupported major.minor version %u.%u",
2420 name->as_C_string(),
2421 major_version,
2422 minor_version);
2423 }
2424 return nullHandle;
2425 }
2427 _major_version = major_version;
2428 _minor_version = minor_version;
2431 // Check if verification needs to be relaxed for this class file
2432 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2433 _relax_verify = Verifier::relax_verify_for(class_loader());
2435 // Constant pool
2436 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2437 int cp_size = cp->length();
2439 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2441 // Access flags
2442 AccessFlags access_flags;
2443 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2445 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2446 // Set abstract bit for old class files for backward compatibility
2447 flags |= JVM_ACC_ABSTRACT;
2448 }
2449 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2450 access_flags.set_flags(flags);
2452 // This class and superclass
2453 instanceKlassHandle super_klass;
2454 u2 this_class_index = cfs->get_u2_fast();
2455 check_property(
2456 valid_cp_range(this_class_index, cp_size) &&
2457 cp->tag_at(this_class_index).is_unresolved_klass(),
2458 "Invalid this class index %u in constant pool in class file %s",
2459 this_class_index, CHECK_(nullHandle));
2461 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2462 assert(class_name.not_null(), "class_name can't be null");
2464 // It's important to set parsed_name *before* resolving the super class.
2465 // (it's used for cleanup by the caller if parsing fails)
2466 parsed_name = class_name;
2468 // Update _class_name which could be null previously to be class_name
2469 _class_name = class_name;
2471 // Don't need to check whether this class name is legal or not.
2472 // It has been checked when constant pool is parsed.
2473 // However, make sure it is not an array type.
2474 if (_need_verify) {
2475 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2476 "Bad class name in class file %s",
2477 CHECK_(nullHandle));
2478 }
2480 klassOop preserve_this_klass; // for storing result across HandleMark
2482 // release all handles when parsing is done
2483 { HandleMark hm(THREAD);
2485 // Checks if name in class file matches requested name
2486 if (name.not_null() && class_name() != name()) {
2487 ResourceMark rm(THREAD);
2488 Exceptions::fthrow(
2489 THREAD_AND_LOCATION,
2490 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2491 "%s (wrong name: %s)",
2492 name->as_C_string(),
2493 class_name->as_C_string()
2494 );
2495 return nullHandle;
2496 }
2498 if (TraceClassLoadingPreorder) {
2499 tty->print("[Loading %s", name()->as_klass_external_name());
2500 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2501 tty->print_cr("]");
2502 }
2504 u2 super_class_index = cfs->get_u2_fast();
2505 if (super_class_index == 0) {
2506 check_property(class_name() == vmSymbols::java_lang_Object(),
2507 "Invalid superclass index %u in class file %s",
2508 super_class_index,
2509 CHECK_(nullHandle));
2510 } else {
2511 check_property(valid_cp_range(super_class_index, cp_size) &&
2512 cp->tag_at(super_class_index).is_unresolved_klass(),
2513 "Invalid superclass index %u in class file %s",
2514 super_class_index,
2515 CHECK_(nullHandle));
2516 // The class name should be legal because it is checked when parsing constant pool.
2517 // However, make sure it is not an array type.
2518 if (_need_verify) {
2519 guarantee_property(cp->unresolved_klass_at(super_class_index)->byte_at(0) != JVM_SIGNATURE_ARRAY,
2520 "Bad superclass name in class file %s", CHECK_(nullHandle));
2521 }
2522 }
2524 // Interfaces
2525 u2 itfs_len = cfs->get_u2_fast();
2526 objArrayHandle local_interfaces;
2527 if (itfs_len == 0) {
2528 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2529 } else {
2530 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle));
2531 }
2533 // Fields (offsets are filled in later)
2534 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2535 objArrayHandle fields_annotations;
2536 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2537 // Methods
2538 bool has_final_method = false;
2539 AccessFlags promoted_flags;
2540 promoted_flags.set_flags(0);
2541 // These need to be oop pointers because they are allocated lazily
2542 // inside parse_methods inside a nested HandleMark
2543 objArrayOop methods_annotations_oop = NULL;
2544 objArrayOop methods_parameter_annotations_oop = NULL;
2545 objArrayOop methods_default_annotations_oop = NULL;
2546 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2547 &promoted_flags,
2548 &has_final_method,
2549 &methods_annotations_oop,
2550 &methods_parameter_annotations_oop,
2551 &methods_default_annotations_oop,
2552 CHECK_(nullHandle));
2554 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2555 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2556 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2558 // We check super class after class file is parsed and format is checked
2559 if (super_class_index > 0) {
2560 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2561 if (access_flags.is_interface()) {
2562 // Before attempting to resolve the superclass, check for class format
2563 // errors not checked yet.
2564 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2565 "Interfaces must have java.lang.Object as superclass in class file %s",
2566 CHECK_(nullHandle));
2567 }
2568 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2569 sk,
2570 class_loader,
2571 protection_domain,
2572 true,
2573 CHECK_(nullHandle));
2574 KlassHandle kh (THREAD, k);
2575 super_klass = instanceKlassHandle(THREAD, kh());
2576 if (super_klass->is_interface()) {
2577 ResourceMark rm(THREAD);
2578 Exceptions::fthrow(
2579 THREAD_AND_LOCATION,
2580 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2581 "class %s has interface %s as super class",
2582 class_name->as_klass_external_name(),
2583 super_klass->external_name()
2584 );
2585 return nullHandle;
2586 }
2587 // Make sure super class is not final
2588 if (super_klass->is_final()) {
2589 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2590 }
2591 }
2593 // Compute the transitive list of all unique interfaces implemented by this class
2594 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2596 // sort methods
2597 typeArrayHandle method_ordering = sort_methods(methods,
2598 methods_annotations,
2599 methods_parameter_annotations,
2600 methods_default_annotations,
2601 CHECK_(nullHandle));
2603 // promote flags from parse_methods() to the klass' flags
2604 access_flags.add_promoted_flags(promoted_flags.as_int());
2606 // Size of Java vtable (in words)
2607 int vtable_size = 0;
2608 int itable_size = 0;
2609 int num_miranda_methods = 0;
2611 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2612 num_miranda_methods,
2613 super_klass(),
2614 methods(),
2615 access_flags,
2616 class_loader(),
2617 class_name(),
2618 local_interfaces());
2620 // Size of Java itable (in words)
2621 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2623 // Field size and offset computation
2624 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2625 #ifndef PRODUCT
2626 int orig_nonstatic_field_size = 0;
2627 #endif
2628 int static_field_size = 0;
2629 int next_static_oop_offset;
2630 int next_static_double_offset;
2631 int next_static_word_offset;
2632 int next_static_short_offset;
2633 int next_static_byte_offset;
2634 int next_static_type_offset;
2635 int next_nonstatic_oop_offset;
2636 int next_nonstatic_double_offset;
2637 int next_nonstatic_word_offset;
2638 int next_nonstatic_short_offset;
2639 int next_nonstatic_byte_offset;
2640 int next_nonstatic_type_offset;
2641 int first_nonstatic_oop_offset;
2642 int first_nonstatic_field_offset;
2643 int next_nonstatic_field_offset;
2645 // Calculate the starting byte offsets
2646 next_static_oop_offset = (instanceKlass::header_size() +
2647 align_object_offset(vtable_size) +
2648 align_object_offset(itable_size)) * wordSize;
2649 next_static_double_offset = next_static_oop_offset +
2650 (fac.static_oop_count * oopSize);
2651 if ( fac.static_double_count &&
2652 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2653 Universe::field_type_should_be_aligned(T_LONG)) ) {
2654 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2655 }
2657 next_static_word_offset = next_static_double_offset +
2658 (fac.static_double_count * BytesPerLong);
2659 next_static_short_offset = next_static_word_offset +
2660 (fac.static_word_count * BytesPerInt);
2661 next_static_byte_offset = next_static_short_offset +
2662 (fac.static_short_count * BytesPerShort);
2663 next_static_type_offset = align_size_up((next_static_byte_offset +
2664 fac.static_byte_count ), wordSize );
2665 static_field_size = (next_static_type_offset -
2666 next_static_oop_offset) / wordSize;
2667 first_nonstatic_field_offset = (instanceOopDesc::header_size() +
2668 nonstatic_field_size) * wordSize;
2669 next_nonstatic_field_offset = first_nonstatic_field_offset;
2671 // Add fake fields for java.lang.Class instances (also see below)
2672 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2673 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2674 }
2676 // Add a fake "discovered" field if it is not present
2677 // for compatibility with earlier jdk's.
2678 if (class_name() == vmSymbols::java_lang_ref_Reference()
2679 && class_loader.is_null()) {
2680 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2681 }
2682 // end of "discovered" field compactibility fix
2684 int nonstatic_double_count = fac.nonstatic_double_count;
2685 int nonstatic_word_count = fac.nonstatic_word_count;
2686 int nonstatic_short_count = fac.nonstatic_short_count;
2687 int nonstatic_byte_count = fac.nonstatic_byte_count;
2688 int nonstatic_oop_count = fac.nonstatic_oop_count;
2690 // Prepare list of oops for oop maps generation.
2691 u2* nonstatic_oop_offsets;
2692 u2* nonstatic_oop_length;
2693 int nonstatic_oop_map_count = 0;
2695 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2696 THREAD, u2, nonstatic_oop_count+1);
2697 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2698 THREAD, u2, nonstatic_oop_count+1);
2700 // Add fake fields for java.lang.Class instances (also see above).
2701 // FieldsAllocationStyle and CompactFields values will be reset to default.
2702 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2703 java_lang_Class_fix_post(&next_nonstatic_field_offset);
2704 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset;
2705 int fake_oop_count = (( next_nonstatic_field_offset -
2706 first_nonstatic_field_offset ) / oopSize);
2707 nonstatic_oop_length [0] = (u2)fake_oop_count;
2708 nonstatic_oop_map_count = 1;
2709 nonstatic_oop_count -= fake_oop_count;
2710 first_nonstatic_oop_offset = first_nonstatic_field_offset;
2711 } else {
2712 first_nonstatic_oop_offset = 0; // will be set for first oop field
2713 }
2715 #ifndef PRODUCT
2716 if( PrintCompactFieldsSavings ) {
2717 next_nonstatic_double_offset = next_nonstatic_field_offset +
2718 (nonstatic_oop_count * oopSize);
2719 if ( nonstatic_double_count > 0 ) {
2720 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2721 }
2722 next_nonstatic_word_offset = next_nonstatic_double_offset +
2723 (nonstatic_double_count * BytesPerLong);
2724 next_nonstatic_short_offset = next_nonstatic_word_offset +
2725 (nonstatic_word_count * BytesPerInt);
2726 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2727 (nonstatic_short_count * BytesPerShort);
2728 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
2729 nonstatic_byte_count ), wordSize );
2730 orig_nonstatic_field_size = nonstatic_field_size +
2731 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/wordSize);
2732 }
2733 #endif
2734 bool compact_fields = CompactFields;
2735 int allocation_style = FieldsAllocationStyle;
2736 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range?
2737 assert(false, "0 <= FieldsAllocationStyle <= 1");
2738 allocation_style = 1; // Optimistic
2739 }
2741 // The next classes have predefined hard-coded fields offsets
2742 // (see in JavaClasses::compute_hard_coded_offsets()).
2743 // Use default fields allocation order for them.
2744 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2745 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2746 class_name() == vmSymbols::java_lang_Class() ||
2747 class_name() == vmSymbols::java_lang_ClassLoader() ||
2748 class_name() == vmSymbols::java_lang_ref_Reference() ||
2749 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2750 class_name() == vmSymbols::java_lang_StackTraceElement() ||
2751 class_name() == vmSymbols::java_lang_String() ||
2752 class_name() == vmSymbols::java_lang_Throwable()) ) {
2753 allocation_style = 0; // Allocate oops first
2754 compact_fields = false; // Don't compact fields
2755 }
2757 if( allocation_style == 0 ) {
2758 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2759 next_nonstatic_oop_offset = next_nonstatic_field_offset;
2760 next_nonstatic_double_offset = next_nonstatic_oop_offset +
2761 (nonstatic_oop_count * oopSize);
2762 } else if( allocation_style == 1 ) {
2763 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
2764 next_nonstatic_double_offset = next_nonstatic_field_offset;
2765 } else {
2766 ShouldNotReachHere();
2767 }
2769 int nonstatic_oop_space_count = 0;
2770 int nonstatic_word_space_count = 0;
2771 int nonstatic_short_space_count = 0;
2772 int nonstatic_byte_space_count = 0;
2773 int nonstatic_oop_space_offset;
2774 int nonstatic_word_space_offset;
2775 int nonstatic_short_space_offset;
2776 int nonstatic_byte_space_offset;
2778 if( nonstatic_double_count > 0 ) {
2779 int offset = next_nonstatic_double_offset;
2780 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
2781 if( compact_fields && offset != next_nonstatic_double_offset ) {
2782 // Allocate available fields into the gap before double field.
2783 int length = next_nonstatic_double_offset - offset;
2784 assert(length == BytesPerInt, "");
2785 nonstatic_word_space_offset = offset;
2786 if( nonstatic_word_count > 0 ) {
2787 nonstatic_word_count -= 1;
2788 nonstatic_word_space_count = 1; // Only one will fit
2789 length -= BytesPerInt;
2790 offset += BytesPerInt;
2791 }
2792 nonstatic_short_space_offset = offset;
2793 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
2794 nonstatic_short_count -= 1;
2795 nonstatic_short_space_count += 1;
2796 length -= BytesPerShort;
2797 offset += BytesPerShort;
2798 }
2799 nonstatic_byte_space_offset = offset;
2800 while( length > 0 && nonstatic_byte_count > 0 ) {
2801 nonstatic_byte_count -= 1;
2802 nonstatic_byte_space_count += 1;
2803 length -= 1;
2804 }
2805 // Allocate oop field in the gap if there are no other fields for that.
2806 nonstatic_oop_space_offset = offset;
2807 if( length >= oopSize && nonstatic_oop_count > 0 &&
2808 allocation_style != 0 ) { // when oop fields not first
2809 nonstatic_oop_count -= 1;
2810 nonstatic_oop_space_count = 1; // Only one will fit
2811 length -= oopSize;
2812 offset += oopSize;
2813 }
2814 }
2815 }
2817 next_nonstatic_word_offset = next_nonstatic_double_offset +
2818 (nonstatic_double_count * BytesPerLong);
2819 next_nonstatic_short_offset = next_nonstatic_word_offset +
2820 (nonstatic_word_count * BytesPerInt);
2821 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2822 (nonstatic_short_count * BytesPerShort);
2824 int notaligned_offset;
2825 if( allocation_style == 0 ) {
2826 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2827 } else { // allocation_style == 1
2828 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2829 if( nonstatic_oop_count > 0 ) {
2830 notaligned_offset = next_nonstatic_oop_offset;
2831 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, oopSize);
2832 }
2833 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * oopSize);
2834 }
2835 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
2836 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
2837 - first_nonstatic_field_offset)/wordSize);
2839 // Iterate over fields again and compute correct offsets.
2840 // The field allocation type was temporarily stored in the offset slot.
2841 // oop fields are located before non-oop fields (static and non-static).
2842 int len = fields->length();
2843 for (int i = 0; i < len; i += instanceKlass::next_offset) {
2844 int real_offset;
2845 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4);
2846 switch (atype) {
2847 case STATIC_OOP:
2848 real_offset = next_static_oop_offset;
2849 next_static_oop_offset += oopSize;
2850 break;
2851 case STATIC_BYTE:
2852 real_offset = next_static_byte_offset;
2853 next_static_byte_offset += 1;
2854 break;
2855 case STATIC_SHORT:
2856 real_offset = next_static_short_offset;
2857 next_static_short_offset += BytesPerShort;
2858 break;
2859 case STATIC_WORD:
2860 real_offset = next_static_word_offset;
2861 next_static_word_offset += BytesPerInt;
2862 break;
2863 case STATIC_ALIGNED_DOUBLE:
2864 case STATIC_DOUBLE:
2865 real_offset = next_static_double_offset;
2866 next_static_double_offset += BytesPerLong;
2867 break;
2868 case NONSTATIC_OOP:
2869 if( nonstatic_oop_space_count > 0 ) {
2870 real_offset = nonstatic_oop_space_offset;
2871 nonstatic_oop_space_offset += oopSize;
2872 nonstatic_oop_space_count -= 1;
2873 } else {
2874 real_offset = next_nonstatic_oop_offset;
2875 next_nonstatic_oop_offset += oopSize;
2876 }
2877 // Update oop maps
2878 if( nonstatic_oop_map_count > 0 &&
2879 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
2880 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * oopSize) ) {
2881 // Extend current oop map
2882 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1;
2883 } else {
2884 // Create new oop map
2885 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset;
2886 nonstatic_oop_length [nonstatic_oop_map_count] = 1;
2887 nonstatic_oop_map_count += 1;
2888 if( first_nonstatic_oop_offset == 0 ) { // Undefined
2889 first_nonstatic_oop_offset = real_offset;
2890 }
2891 }
2892 break;
2893 case NONSTATIC_BYTE:
2894 if( nonstatic_byte_space_count > 0 ) {
2895 real_offset = nonstatic_byte_space_offset;
2896 nonstatic_byte_space_offset += 1;
2897 nonstatic_byte_space_count -= 1;
2898 } else {
2899 real_offset = next_nonstatic_byte_offset;
2900 next_nonstatic_byte_offset += 1;
2901 }
2902 break;
2903 case NONSTATIC_SHORT:
2904 if( nonstatic_short_space_count > 0 ) {
2905 real_offset = nonstatic_short_space_offset;
2906 nonstatic_short_space_offset += BytesPerShort;
2907 nonstatic_short_space_count -= 1;
2908 } else {
2909 real_offset = next_nonstatic_short_offset;
2910 next_nonstatic_short_offset += BytesPerShort;
2911 }
2912 break;
2913 case NONSTATIC_WORD:
2914 if( nonstatic_word_space_count > 0 ) {
2915 real_offset = nonstatic_word_space_offset;
2916 nonstatic_word_space_offset += BytesPerInt;
2917 nonstatic_word_space_count -= 1;
2918 } else {
2919 real_offset = next_nonstatic_word_offset;
2920 next_nonstatic_word_offset += BytesPerInt;
2921 }
2922 break;
2923 case NONSTATIC_ALIGNED_DOUBLE:
2924 case NONSTATIC_DOUBLE:
2925 real_offset = next_nonstatic_double_offset;
2926 next_nonstatic_double_offset += BytesPerLong;
2927 break;
2928 default:
2929 ShouldNotReachHere();
2930 }
2931 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) );
2932 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) );
2933 }
2935 // Size of instances
2936 int instance_size;
2938 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
2940 assert(instance_size == align_object_size(instanceOopDesc::header_size() + nonstatic_field_size), "consistent layout helper value");
2942 // Size of non-static oop map blocks (in words) allocated at end of klass
2943 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset);
2945 // Compute reference type
2946 ReferenceType rt;
2947 if (super_klass() == NULL) {
2948 rt = REF_NONE;
2949 } else {
2950 rt = super_klass->reference_type();
2951 }
2953 // We can now create the basic klassOop for this klass
2954 klassOop ik = oopFactory::new_instanceKlass(
2955 vtable_size, itable_size,
2956 static_field_size, nonstatic_oop_map_size,
2957 rt, CHECK_(nullHandle));
2958 instanceKlassHandle this_klass (THREAD, ik);
2960 assert(this_klass->static_field_size() == static_field_size &&
2961 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check");
2963 // Fill in information already parsed
2964 this_klass->set_access_flags(access_flags);
2965 jint lh = Klass::instance_layout_helper(instance_size, false);
2966 this_klass->set_layout_helper(lh);
2967 assert(this_klass->oop_is_instance(), "layout is correct");
2968 assert(this_klass->size_helper() == instance_size, "correct size_helper");
2969 // Not yet: supers are done below to support the new subtype-checking fields
2970 //this_klass->set_super(super_klass());
2971 this_klass->set_class_loader(class_loader());
2972 this_klass->set_nonstatic_field_size(nonstatic_field_size);
2973 this_klass->set_static_oop_field_size(fac.static_oop_count);
2974 cp->set_pool_holder(this_klass());
2975 this_klass->set_constants(cp());
2976 this_klass->set_local_interfaces(local_interfaces());
2977 this_klass->set_fields(fields());
2978 this_klass->set_methods(methods());
2979 if (has_final_method) {
2980 this_klass->set_has_final_method();
2981 }
2982 this_klass->set_method_ordering(method_ordering());
2983 this_klass->set_initial_method_idnum(methods->length());
2984 this_klass->set_name(cp->klass_name_at(this_class_index));
2985 this_klass->set_protection_domain(protection_domain());
2986 this_klass->set_fields_annotations(fields_annotations());
2987 this_klass->set_methods_annotations(methods_annotations());
2988 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
2989 this_klass->set_methods_default_annotations(methods_default_annotations());
2991 this_klass->set_minor_version(minor_version);
2992 this_klass->set_major_version(major_version);
2994 if (cached_class_file_bytes != NULL) {
2995 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
2996 this_klass->set_cached_class_file(cached_class_file_bytes,
2997 cached_class_file_length);
2998 }
3000 // Miranda methods
3001 if ((num_miranda_methods > 0) ||
3002 // if this class introduced new miranda methods or
3003 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3004 // super class exists and this class inherited miranda methods
3005 ) {
3006 this_klass->set_has_miranda_methods(); // then set a flag
3007 }
3009 // Additional attributes
3010 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3012 // Make sure this is the end of class file stream
3013 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3015 // Initialize static fields
3016 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3018 // VerifyOops believes that once this has been set, the object is completely loaded.
3019 // Compute transitive closure of interfaces this class implements
3020 this_klass->set_transitive_interfaces(transitive_interfaces());
3022 // Fill in information needed to compute superclasses.
3023 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3025 // Initialize itable offset tables
3026 klassItable::setup_itable_offset_table(this_klass);
3028 // Do final class setup
3029 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length);
3031 set_precomputed_flags(this_klass);
3033 // reinitialize modifiers, using the InnerClasses attribute
3034 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3035 this_klass->set_modifier_flags(computed_modifiers);
3037 // check if this class can access its super class
3038 check_super_class_access(this_klass, CHECK_(nullHandle));
3040 // check if this class can access its superinterfaces
3041 check_super_interface_access(this_klass, CHECK_(nullHandle));
3043 // check if this class overrides any final method
3044 check_final_method_override(this_klass, CHECK_(nullHandle));
3046 // check that if this class is an interface then it doesn't have static methods
3047 if (this_klass->is_interface()) {
3048 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3049 }
3051 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3052 false /* not shared class */);
3054 if (TraceClassLoading) {
3055 // print in a single call to reduce interleaving of output
3056 if (cfs->source() != NULL) {
3057 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3058 cfs->source());
3059 } else if (class_loader.is_null()) {
3060 if (THREAD->is_Java_thread()) {
3061 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3062 tty->print("[Loaded %s by instance of %s]\n",
3063 this_klass->external_name(),
3064 instanceKlass::cast(caller)->external_name());
3065 } else {
3066 tty->print("[Loaded %s]\n", this_klass->external_name());
3067 }
3068 } else {
3069 ResourceMark rm;
3070 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3071 instanceKlass::cast(class_loader->klass())->external_name());
3072 }
3073 }
3075 if (TraceClassResolution) {
3076 // print out the superclass.
3077 const char * from = Klass::cast(this_klass())->external_name();
3078 if (this_klass->java_super() != NULL) {
3079 tty->print("RESOLVE %s %s\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3080 }
3081 // print out each of the interface classes referred to by this class.
3082 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3083 if (!local_interfaces.is_null()) {
3084 int length = local_interfaces->length();
3085 for (int i = 0; i < length; i++) {
3086 klassOop k = klassOop(local_interfaces->obj_at(i));
3087 instanceKlass* to_class = instanceKlass::cast(k);
3088 const char * to = to_class->external_name();
3089 tty->print("RESOLVE %s %s\n", from, to);
3090 }
3091 }
3092 }
3094 #ifndef PRODUCT
3095 if( PrintCompactFieldsSavings ) {
3096 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3097 tty->print("[Saved %d of %3d words in %s]\n",
3098 orig_nonstatic_field_size - nonstatic_field_size,
3099 orig_nonstatic_field_size, this_klass->external_name());
3100 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3101 tty->print("[Wasted %d over %3d words in %s]\n",
3102 nonstatic_field_size - orig_nonstatic_field_size,
3103 orig_nonstatic_field_size, this_klass->external_name());
3104 }
3105 }
3106 #endif
3108 // preserve result across HandleMark
3109 preserve_this_klass = this_klass();
3110 }
3112 // Create new handle outside HandleMark
3113 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3114 debug_only(this_klass->as_klassOop()->verify();)
3116 return this_klass;
3117 }
3120 int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) {
3121 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size();
3122 if (nonstatic_oop_map_count > 0) {
3123 // We have oops to add to map
3124 if (map_size == 0) {
3125 map_size = nonstatic_oop_map_count;
3126 } else {
3127 // Check whether we should add a new map block or whether the last one can be extended
3128 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps();
3129 OopMapBlock* last_map = first_map + map_size - 1;
3131 int next_offset = last_map->offset() + (last_map->length() * oopSize);
3132 if (next_offset == first_nonstatic_oop_offset) {
3133 // There is no gap bettwen superklass's last oop field and first
3134 // local oop field, merge maps.
3135 nonstatic_oop_map_count -= 1;
3136 } else {
3137 // Superklass didn't end with a oop field, add extra maps
3138 assert(next_offset<first_nonstatic_oop_offset, "just checking");
3139 }
3140 map_size += nonstatic_oop_map_count;
3141 }
3142 }
3143 return map_size;
3144 }
3147 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3148 int nonstatic_oop_map_count,
3149 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) {
3150 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3151 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size();
3152 instanceKlass* super = k->superklass();
3153 if (super != NULL) {
3154 int super_oop_map_size = super->nonstatic_oop_map_size();
3155 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3156 // Copy maps from superklass
3157 while (super_oop_map_size-- > 0) {
3158 *this_oop_map++ = *super_oop_map++;
3159 }
3160 }
3161 if (nonstatic_oop_map_count > 0) {
3162 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) {
3163 // Calculated in compute_oop_map_size() number of oop maps is less then
3164 // collected oop maps since there is no gap between superklass's last oop
3165 // field and first local oop field. Extend the last oop map copied
3166 // from the superklass instead of creating new one.
3167 nonstatic_oop_map_count--;
3168 nonstatic_oop_offsets++;
3169 this_oop_map--;
3170 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++);
3171 this_oop_map++;
3172 }
3173 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking");
3174 // Add new map blocks, fill them
3175 while (nonstatic_oop_map_count-- > 0) {
3176 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3177 this_oop_map->set_length(*nonstatic_oop_length++);
3178 this_oop_map++;
3179 }
3180 }
3181 }
3184 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3185 klassOop super = k->super();
3187 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3188 // in which case we don't have to register objects as finalizable
3189 if (!_has_empty_finalizer) {
3190 if (_has_finalizer ||
3191 (super != NULL && super->klass_part()->has_finalizer())) {
3192 k->set_has_finalizer();
3193 }
3194 }
3196 #ifdef ASSERT
3197 bool f = false;
3198 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3199 vmSymbols::void_method_signature());
3200 if (m != NULL && !m->is_empty_method()) {
3201 f = true;
3202 }
3203 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3204 #endif
3206 // Check if this klass supports the java.lang.Cloneable interface
3207 if (SystemDictionary::cloneable_klass_loaded()) {
3208 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) {
3209 k->set_is_cloneable();
3210 }
3211 }
3213 // Check if this klass has a vanilla default constructor
3214 if (super == NULL) {
3215 // java.lang.Object has empty default constructor
3216 k->set_has_vanilla_constructor();
3217 } else {
3218 if (Klass::cast(super)->has_vanilla_constructor() &&
3219 _has_vanilla_constructor) {
3220 k->set_has_vanilla_constructor();
3221 }
3222 #ifdef ASSERT
3223 bool v = false;
3224 if (Klass::cast(super)->has_vanilla_constructor()) {
3225 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3226 ), vmSymbols::void_method_signature());
3227 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3228 v = true;
3229 }
3230 }
3231 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3232 #endif
3233 }
3235 // If it cannot be fast-path allocated, set a bit in the layout helper.
3236 // See documentation of instanceKlass::can_be_fastpath_allocated().
3237 assert(k->size_helper() > 0, "layout_helper is initialized");
3238 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3239 || k->is_abstract() || k->is_interface()
3240 || (k->name() == vmSymbols::java_lang_Class()
3241 && k->class_loader() == NULL)
3242 || k->size_helper() >= FastAllocateSizeLimit) {
3243 // Forbid fast-path allocation.
3244 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3245 k->set_layout_helper(lh);
3246 }
3247 }
3250 // utility method for appending and array with check for duplicates
3252 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3253 // iterate over new interfaces
3254 for (int i = 0; i < ifs->length(); i++) {
3255 oop e = ifs->obj_at(i);
3256 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3257 // check for duplicates
3258 bool duplicate = false;
3259 for (int j = 0; j < index; j++) {
3260 if (result->obj_at(j) == e) {
3261 duplicate = true;
3262 break;
3263 }
3264 }
3265 // add new interface
3266 if (!duplicate) {
3267 result->obj_at_put(index++, e);
3268 }
3269 }
3270 }
3272 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3273 // Compute maximum size for transitive interfaces
3274 int max_transitive_size = 0;
3275 int super_size = 0;
3276 // Add superclass transitive interfaces size
3277 if (super.not_null()) {
3278 super_size = super->transitive_interfaces()->length();
3279 max_transitive_size += super_size;
3280 }
3281 // Add local interfaces' super interfaces
3282 int local_size = local_ifs->length();
3283 for (int i = 0; i < local_size; i++) {
3284 klassOop l = klassOop(local_ifs->obj_at(i));
3285 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3286 }
3287 // Finally add local interfaces
3288 max_transitive_size += local_size;
3289 // Construct array
3290 objArrayHandle result;
3291 if (max_transitive_size == 0) {
3292 // no interfaces, use canonicalized array
3293 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3294 } else if (max_transitive_size == super_size) {
3295 // no new local interfaces added, share superklass' transitive interface array
3296 result = objArrayHandle(THREAD, super->transitive_interfaces());
3297 } else if (max_transitive_size == local_size) {
3298 // only local interfaces added, share local interface array
3299 result = local_ifs;
3300 } else {
3301 objArrayHandle nullHandle;
3302 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3303 result = objArrayHandle(THREAD, new_objarray);
3304 int index = 0;
3305 // Copy down from superclass
3306 if (super.not_null()) {
3307 append_interfaces(result, index, super->transitive_interfaces());
3308 }
3309 // Copy down from local interfaces' superinterfaces
3310 for (int i = 0; i < local_ifs->length(); i++) {
3311 klassOop l = klassOop(local_ifs->obj_at(i));
3312 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3313 }
3314 // Finally add local interfaces
3315 append_interfaces(result, index, local_ifs());
3317 // Check if duplicates were removed
3318 if (index != max_transitive_size) {
3319 assert(index < max_transitive_size, "just checking");
3320 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3321 for (int i = 0; i < index; i++) {
3322 oop e = result->obj_at(i);
3323 assert(e != NULL, "just checking");
3324 new_result->obj_at_put(i, e);
3325 }
3326 result = objArrayHandle(THREAD, new_result);
3327 }
3328 }
3329 return result;
3330 }
3333 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3334 klassOop super = this_klass->super();
3335 if ((super != NULL) &&
3336 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3337 ResourceMark rm(THREAD);
3338 Exceptions::fthrow(
3339 THREAD_AND_LOCATION,
3340 vmSymbolHandles::java_lang_IllegalAccessError(),
3341 "class %s cannot access its superclass %s",
3342 this_klass->external_name(),
3343 instanceKlass::cast(super)->external_name()
3344 );
3345 return;
3346 }
3347 }
3350 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3351 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3352 int lng = local_interfaces->length();
3353 for (int i = lng - 1; i >= 0; i--) {
3354 klassOop k = klassOop(local_interfaces->obj_at(i));
3355 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3356 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3357 ResourceMark rm(THREAD);
3358 Exceptions::fthrow(
3359 THREAD_AND_LOCATION,
3360 vmSymbolHandles::java_lang_IllegalAccessError(),
3361 "class %s cannot access its superinterface %s",
3362 this_klass->external_name(),
3363 instanceKlass::cast(k)->external_name()
3364 );
3365 return;
3366 }
3367 }
3368 }
3371 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3372 objArrayHandle methods (THREAD, this_klass->methods());
3373 int num_methods = methods->length();
3375 // go thru each method and check if it overrides a final method
3376 for (int index = 0; index < num_methods; index++) {
3377 methodOop m = (methodOop)methods->obj_at(index);
3379 // skip private, static and <init> methods
3380 if ((!m->is_private()) &&
3381 (!m->is_static()) &&
3382 (m->name() != vmSymbols::object_initializer_name())) {
3384 symbolOop name = m->name();
3385 symbolOop signature = m->signature();
3386 klassOop k = this_klass->super();
3387 methodOop super_m = NULL;
3388 while (k != NULL) {
3389 // skip supers that don't have final methods.
3390 if (k->klass_part()->has_final_method()) {
3391 // lookup a matching method in the super class hierarchy
3392 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3393 if (super_m == NULL) {
3394 break; // didn't find any match; get out
3395 }
3397 if (super_m->is_final() &&
3398 // matching method in super is final
3399 (Reflection::verify_field_access(this_klass->as_klassOop(),
3400 super_m->method_holder(),
3401 super_m->method_holder(),
3402 super_m->access_flags(), false))
3403 // this class can access super final method and therefore override
3404 ) {
3405 ResourceMark rm(THREAD);
3406 Exceptions::fthrow(
3407 THREAD_AND_LOCATION,
3408 vmSymbolHandles::java_lang_VerifyError(),
3409 "class %s overrides final method %s.%s",
3410 this_klass->external_name(),
3411 name->as_C_string(),
3412 signature->as_C_string()
3413 );
3414 return;
3415 }
3417 // continue to look from super_m's holder's super.
3418 k = instanceKlass::cast(super_m->method_holder())->super();
3419 continue;
3420 }
3422 k = k->klass_part()->super();
3423 }
3424 }
3425 }
3426 }
3429 // assumes that this_klass is an interface
3430 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3431 assert(this_klass->is_interface(), "not an interface");
3432 objArrayHandle methods (THREAD, this_klass->methods());
3433 int num_methods = methods->length();
3435 for (int index = 0; index < num_methods; index++) {
3436 methodOop m = (methodOop)methods->obj_at(index);
3437 // if m is static and not the init method, throw a verify error
3438 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3439 ResourceMark rm(THREAD);
3440 Exceptions::fthrow(
3441 THREAD_AND_LOCATION,
3442 vmSymbolHandles::java_lang_VerifyError(),
3443 "Illegal static method %s in interface %s",
3444 m->name()->as_C_string(),
3445 this_klass->external_name()
3446 );
3447 return;
3448 }
3449 }
3450 }
3452 // utility methods for format checking
3454 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3455 if (!_need_verify) { return; }
3457 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3458 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3459 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3460 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3461 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3462 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3463 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3465 if ((is_abstract && is_final) ||
3466 (is_interface && !is_abstract) ||
3467 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3468 (!is_interface && major_gte_15 && is_annotation)) {
3469 ResourceMark rm(THREAD);
3470 Exceptions::fthrow(
3471 THREAD_AND_LOCATION,
3472 vmSymbolHandles::java_lang_ClassFormatError(),
3473 "Illegal class modifiers in class %s: 0x%X",
3474 _class_name->as_C_string(), flags
3475 );
3476 return;
3477 }
3478 }
3480 bool ClassFileParser::has_illegal_visibility(jint flags) {
3481 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3482 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3483 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3485 return ((is_public && is_protected) ||
3486 (is_public && is_private) ||
3487 (is_protected && is_private));
3488 }
3490 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3491 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3492 (major <= JAVA_MAX_SUPPORTED_VERSION) &&
3493 ((major != JAVA_MAX_SUPPORTED_VERSION) ||
3494 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3495 }
3497 void ClassFileParser::verify_legal_field_modifiers(
3498 jint flags, bool is_interface, TRAPS) {
3499 if (!_need_verify) { return; }
3501 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3502 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3503 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3504 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3505 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3506 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3507 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3508 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3509 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3511 bool is_illegal = false;
3513 if (is_interface) {
3514 if (!is_public || !is_static || !is_final || is_private ||
3515 is_protected || is_volatile || is_transient ||
3516 (major_gte_15 && is_enum)) {
3517 is_illegal = true;
3518 }
3519 } else { // not interface
3520 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3521 is_illegal = true;
3522 }
3523 }
3525 if (is_illegal) {
3526 ResourceMark rm(THREAD);
3527 Exceptions::fthrow(
3528 THREAD_AND_LOCATION,
3529 vmSymbolHandles::java_lang_ClassFormatError(),
3530 "Illegal field modifiers in class %s: 0x%X",
3531 _class_name->as_C_string(), flags);
3532 return;
3533 }
3534 }
3536 void ClassFileParser::verify_legal_method_modifiers(
3537 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3538 if (!_need_verify) { return; }
3540 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3541 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3542 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3543 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3544 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3545 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3546 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3547 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3548 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3549 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3550 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3552 bool is_illegal = false;
3554 if (is_interface) {
3555 if (!is_abstract || !is_public || is_static || is_final ||
3556 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3557 is_illegal = true;
3558 }
3559 } else { // not interface
3560 if (is_initializer) {
3561 if (is_static || is_final || is_synchronized || is_native ||
3562 is_abstract || (major_gte_15 && is_bridge)) {
3563 is_illegal = true;
3564 }
3565 } else { // not initializer
3566 if (is_abstract) {
3567 if ((is_final || is_native || is_private || is_static ||
3568 (major_gte_15 && (is_synchronized || is_strict)))) {
3569 is_illegal = true;
3570 }
3571 }
3572 if (has_illegal_visibility(flags)) {
3573 is_illegal = true;
3574 }
3575 }
3576 }
3578 if (is_illegal) {
3579 ResourceMark rm(THREAD);
3580 Exceptions::fthrow(
3581 THREAD_AND_LOCATION,
3582 vmSymbolHandles::java_lang_ClassFormatError(),
3583 "Method %s in class %s has illegal modifiers: 0x%X",
3584 name->as_C_string(), _class_name->as_C_string(), flags);
3585 return;
3586 }
3587 }
3589 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3590 assert(_need_verify, "only called when _need_verify is true");
3591 int i = 0;
3592 int count = length >> 2;
3593 for (int k=0; k<count; k++) {
3594 unsigned char b0 = buffer[i];
3595 unsigned char b1 = buffer[i+1];
3596 unsigned char b2 = buffer[i+2];
3597 unsigned char b3 = buffer[i+3];
3598 // For an unsigned char v,
3599 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3600 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3601 unsigned char res = b0 | b0 - 1 |
3602 b1 | b1 - 1 |
3603 b2 | b2 - 1 |
3604 b3 | b3 - 1;
3605 if (res >= 128) break;
3606 i += 4;
3607 }
3608 for(; i < length; i++) {
3609 unsigned short c;
3610 // no embedded zeros
3611 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3612 if(buffer[i] < 128) {
3613 continue;
3614 }
3615 if ((i + 5) < length) { // see if it's legal supplementary character
3616 if (UTF8::is_supplementary_character(&buffer[i])) {
3617 c = UTF8::get_supplementary_character(&buffer[i]);
3618 i += 5;
3619 continue;
3620 }
3621 }
3622 switch (buffer[i] >> 4) {
3623 default: break;
3624 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3625 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3626 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
3627 c = (buffer[i] & 0x1F) << 6;
3628 i++;
3629 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3630 c += buffer[i] & 0x3F;
3631 if (_major_version <= 47 || c == 0 || c >= 0x80) {
3632 // for classes with major > 47, c must a null or a character in its shortest form
3633 break;
3634 }
3635 }
3636 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3637 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
3638 c = (buffer[i] & 0xF) << 12;
3639 i += 2;
3640 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3641 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3642 if (_major_version <= 47 || c >= 0x800) {
3643 // for classes with major > 47, c must be in its shortest form
3644 break;
3645 }
3646 }
3647 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3648 } // end of switch
3649 } // end of for
3650 }
3652 // Checks if name is a legal class name.
3653 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3654 if (!_need_verify || _relax_verify) { return; }
3656 char buf[fixed_buffer_size];
3657 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3658 unsigned int length = name->utf8_length();
3659 bool legal = false;
3661 if (length > 0) {
3662 char* p;
3663 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3664 p = skip_over_field_signature(bytes, false, length, CHECK);
3665 legal = (p != NULL) && ((p - bytes) == (int)length);
3666 } else if (_major_version < JAVA_1_5_VERSION) {
3667 if (bytes[0] != '<') {
3668 p = skip_over_field_name(bytes, true, length);
3669 legal = (p != NULL) && ((p - bytes) == (int)length);
3670 }
3671 } else {
3672 // 4900761: relax the constraints based on JSR202 spec
3673 // Class names may be drawn from the entire Unicode character set.
3674 // Identifiers between '/' must be unqualified names.
3675 // The utf8 string has been verified when parsing cpool entries.
3676 legal = verify_unqualified_name(bytes, length, LegalClass);
3677 }
3678 }
3679 if (!legal) {
3680 ResourceMark rm(THREAD);
3681 Exceptions::fthrow(
3682 THREAD_AND_LOCATION,
3683 vmSymbolHandles::java_lang_ClassFormatError(),
3684 "Illegal class name \"%s\" in class file %s", bytes,
3685 _class_name->as_C_string()
3686 );
3687 return;
3688 }
3689 }
3691 // Checks if name is a legal field name.
3692 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3693 if (!_need_verify || _relax_verify) { return; }
3695 char buf[fixed_buffer_size];
3696 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3697 unsigned int length = name->utf8_length();
3698 bool legal = false;
3700 if (length > 0) {
3701 if (_major_version < JAVA_1_5_VERSION) {
3702 if (bytes[0] != '<') {
3703 char* p = skip_over_field_name(bytes, false, length);
3704 legal = (p != NULL) && ((p - bytes) == (int)length);
3705 }
3706 } else {
3707 // 4881221: relax the constraints based on JSR202 spec
3708 legal = verify_unqualified_name(bytes, length, LegalField);
3709 }
3710 }
3712 if (!legal) {
3713 ResourceMark rm(THREAD);
3714 Exceptions::fthrow(
3715 THREAD_AND_LOCATION,
3716 vmSymbolHandles::java_lang_ClassFormatError(),
3717 "Illegal field name \"%s\" in class %s", bytes,
3718 _class_name->as_C_string()
3719 );
3720 return;
3721 }
3722 }
3724 // Checks if name is a legal method name.
3725 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
3726 if (!_need_verify || _relax_verify) { return; }
3728 assert(!name.is_null(), "method name is null");
3729 char buf[fixed_buffer_size];
3730 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3731 unsigned int length = name->utf8_length();
3732 bool legal = false;
3734 if (length > 0) {
3735 if (bytes[0] == '<') {
3736 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
3737 legal = true;
3738 }
3739 } else if (_major_version < JAVA_1_5_VERSION) {
3740 char* p;
3741 p = skip_over_field_name(bytes, false, length);
3742 legal = (p != NULL) && ((p - bytes) == (int)length);
3743 } else {
3744 // 4881221: relax the constraints based on JSR202 spec
3745 legal = verify_unqualified_name(bytes, length, LegalMethod);
3746 }
3747 }
3749 if (!legal) {
3750 ResourceMark rm(THREAD);
3751 Exceptions::fthrow(
3752 THREAD_AND_LOCATION,
3753 vmSymbolHandles::java_lang_ClassFormatError(),
3754 "Illegal method name \"%s\" in class %s", bytes,
3755 _class_name->as_C_string()
3756 );
3757 return;
3758 }
3759 }
3762 // Checks if signature is a legal field signature.
3763 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3764 if (!_need_verify) { return; }
3766 char buf[fixed_buffer_size];
3767 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3768 unsigned int length = signature->utf8_length();
3769 char* p = skip_over_field_signature(bytes, false, length, CHECK);
3771 if (p == NULL || (p - bytes) != (int)length) {
3772 ResourceMark rm(THREAD);
3773 Exceptions::fthrow(
3774 THREAD_AND_LOCATION,
3775 vmSymbolHandles::java_lang_ClassFormatError(),
3776 "Field \"%s\" in class %s has illegal signature \"%s\"",
3777 name->as_C_string(), _class_name->as_C_string(), bytes
3778 );
3779 return;
3780 }
3781 }
3783 // Checks if signature is a legal method signature.
3784 // Returns number of parameters
3785 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3786 if (!_need_verify) {
3787 // make sure caller's args_size will be less than 0 even for non-static
3788 // method so it will be recomputed in compute_size_of_parameters().
3789 return -2;
3790 }
3792 unsigned int args_size = 0;
3793 char buf[fixed_buffer_size];
3794 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3795 unsigned int length = signature->utf8_length();
3796 char* nextp;
3798 // The first character must be a '('
3799 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
3800 length--;
3801 // Skip over legal field signatures
3802 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3803 while ((length > 0) && (nextp != NULL)) {
3804 args_size++;
3805 if (p[0] == 'J' || p[0] == 'D') {
3806 args_size++;
3807 }
3808 length -= nextp - p;
3809 p = nextp;
3810 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3811 }
3812 // The first non-signature thing better be a ')'
3813 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
3814 length--;
3815 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
3816 // All internal methods must return void
3817 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
3818 return args_size;
3819 }
3820 } else {
3821 // Now we better just have a return value
3822 nextp = skip_over_field_signature(p, true, length, CHECK_0);
3823 if (nextp && ((int)length == (nextp - p))) {
3824 return args_size;
3825 }
3826 }
3827 }
3828 }
3829 // Report error
3830 ResourceMark rm(THREAD);
3831 Exceptions::fthrow(
3832 THREAD_AND_LOCATION,
3833 vmSymbolHandles::java_lang_ClassFormatError(),
3834 "Method \"%s\" in class %s has illegal signature \"%s\"",
3835 name->as_C_string(), _class_name->as_C_string(), p
3836 );
3837 return 0;
3838 }
3841 // Unqualified names may not contain the characters '.', ';', or '/'.
3842 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
3843 // Note that method names may not be <init> or <clinit> in this method.
3844 // Because these names have been checked as special cases before calling this method
3845 // in verify_legal_method_name.
3846 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
3847 jchar ch;
3849 for (char* p = name; p != name + length; ) {
3850 ch = *p;
3851 if (ch < 128) {
3852 p++;
3853 if (ch == '.' || ch == ';') {
3854 return false; // do not permit '.' or ';'
3855 }
3856 if (type != LegalClass && ch == '/') {
3857 return false; // do not permit '/' unless it's class name
3858 }
3859 if (type == LegalMethod && (ch == '<' || ch == '>')) {
3860 return false; // do not permit '<' or '>' in method names
3861 }
3862 } else {
3863 char* tmp_p = UTF8::next(p, &ch);
3864 p = tmp_p;
3865 }
3866 }
3867 return true;
3868 }
3871 // Take pointer to a string. Skip over the longest part of the string that could
3872 // be taken as a fieldname. Allow '/' if slash_ok is true.
3873 // Return a pointer to just past the fieldname.
3874 // Return NULL if no fieldname at all was found, or in the case of slash_ok
3875 // being true, we saw consecutive slashes (meaning we were looking for a
3876 // qualified path but found something that was badly-formed).
3877 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
3878 char* p;
3879 jchar ch;
3880 jboolean last_is_slash = false;
3881 jboolean not_first_ch = false;
3883 for (p = name; p != name + length; not_first_ch = true) {
3884 char* old_p = p;
3885 ch = *p;
3886 if (ch < 128) {
3887 p++;
3888 // quick check for ascii
3889 if ((ch >= 'a' && ch <= 'z') ||
3890 (ch >= 'A' && ch <= 'Z') ||
3891 (ch == '_' || ch == '$') ||
3892 (not_first_ch && ch >= '0' && ch <= '9')) {
3893 last_is_slash = false;
3894 continue;
3895 }
3896 if (slash_ok && ch == '/') {
3897 if (last_is_slash) {
3898 return NULL; // Don't permit consecutive slashes
3899 }
3900 last_is_slash = true;
3901 continue;
3902 }
3903 } else {
3904 jint unicode_ch;
3905 char* tmp_p = UTF8::next_character(p, &unicode_ch);
3906 p = tmp_p;
3907 last_is_slash = false;
3908 // Check if ch is Java identifier start or is Java identifier part
3909 // 4672820: call java.lang.Character methods directly without generating separate tables.
3910 EXCEPTION_MARK;
3911 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass());
3913 // return value
3914 JavaValue result(T_BOOLEAN);
3915 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
3916 JavaCallArguments args;
3917 args.push_int(unicode_ch);
3919 // public static boolean isJavaIdentifierStart(char ch);
3920 JavaCalls::call_static(&result,
3921 klass,
3922 vmSymbolHandles::isJavaIdentifierStart_name(),
3923 vmSymbolHandles::int_bool_signature(),
3924 &args,
3925 THREAD);
3927 if (HAS_PENDING_EXCEPTION) {
3928 CLEAR_PENDING_EXCEPTION;
3929 return 0;
3930 }
3931 if (result.get_jboolean()) {
3932 continue;
3933 }
3935 if (not_first_ch) {
3936 // public static boolean isJavaIdentifierPart(char ch);
3937 JavaCalls::call_static(&result,
3938 klass,
3939 vmSymbolHandles::isJavaIdentifierPart_name(),
3940 vmSymbolHandles::int_bool_signature(),
3941 &args,
3942 THREAD);
3944 if (HAS_PENDING_EXCEPTION) {
3945 CLEAR_PENDING_EXCEPTION;
3946 return 0;
3947 }
3949 if (result.get_jboolean()) {
3950 continue;
3951 }
3952 }
3953 }
3954 return (not_first_ch) ? old_p : NULL;
3955 }
3956 return (not_first_ch) ? p : NULL;
3957 }
3960 // Take pointer to a string. Skip over the longest part of the string that could
3961 // be taken as a field signature. Allow "void" if void_ok.
3962 // Return a pointer to just past the signature.
3963 // Return NULL if no legal signature is found.
3964 char* ClassFileParser::skip_over_field_signature(char* signature,
3965 bool void_ok,
3966 unsigned int length,
3967 TRAPS) {
3968 unsigned int array_dim = 0;
3969 while (length > 0) {
3970 switch (signature[0]) {
3971 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
3972 case JVM_SIGNATURE_BOOLEAN:
3973 case JVM_SIGNATURE_BYTE:
3974 case JVM_SIGNATURE_CHAR:
3975 case JVM_SIGNATURE_SHORT:
3976 case JVM_SIGNATURE_INT:
3977 case JVM_SIGNATURE_FLOAT:
3978 case JVM_SIGNATURE_LONG:
3979 case JVM_SIGNATURE_DOUBLE:
3980 return signature + 1;
3981 case JVM_SIGNATURE_CLASS: {
3982 if (_major_version < JAVA_1_5_VERSION) {
3983 // Skip over the class name if one is there
3984 char* p = skip_over_field_name(signature + 1, true, --length);
3986 // The next character better be a semicolon
3987 if (p && (p - signature) > 1 && p[0] == ';') {
3988 return p + 1;
3989 }
3990 } else {
3991 // 4900761: For class version > 48, any unicode is allowed in class name.
3992 length--;
3993 signature++;
3994 while (length > 0 && signature[0] != ';') {
3995 if (signature[0] == '.') {
3996 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
3997 }
3998 length--;
3999 signature++;
4000 }
4001 if (signature[0] == ';') { return signature + 1; }
4002 }
4004 return NULL;
4005 }
4006 case JVM_SIGNATURE_ARRAY:
4007 array_dim++;
4008 if (array_dim > 255) {
4009 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4010 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4011 }
4012 // The rest of what's there better be a legal signature
4013 signature++;
4014 length--;
4015 void_ok = false;
4016 break;
4018 default:
4019 return NULL;
4020 }
4021 }
4022 return NULL;
4023 }