Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/classfile/classFileParser.cpp@7a018855d2f0
src/share/vm/classfile/classFileParser.cpp
Mon, 08 Dec 2008 17:15:02 -0800
- author
- jrose
- date
- Mon, 08 Dec 2008 17:15:02 -0800
- changeset 909
- 7a018855d2f0
- parent 866
- a45484ea312d
- child 953
- 0af8b0718fc9
- permissions
- -rw-r--r--
6779339: turn off LinkWellKnownClasses by default pending further testing
Summary: temporarily turn off LinkWellKnownClasses optimization
Reviewed-by: never, kvn
1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
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 51
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 // - also used as the max version when running in jdk6
48 #define JAVA_6_VERSION 50
51 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
52 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
53 // this function (_current can be allocated in a register, with scalar
54 // replacement of aggregates). The _current pointer is copied back to
55 // stream() when this function returns. DON'T call another method within
56 // this method that uses stream().
57 ClassFileStream* cfs0 = stream();
58 ClassFileStream cfs1 = *cfs0;
59 ClassFileStream* cfs = &cfs1;
60 #ifdef ASSERT
61 u1* old_current = cfs0->current();
62 #endif
64 // Used for batching symbol allocations.
65 const char* names[SymbolTable::symbol_alloc_batch_size];
66 int lengths[SymbolTable::symbol_alloc_batch_size];
67 int indices[SymbolTable::symbol_alloc_batch_size];
68 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
69 int names_count = 0;
71 // parsing Index 0 is unused
72 for (int index = 1; index < length; index++) {
73 // Each of the following case guarantees one more byte in the stream
74 // for the following tag or the access_flags following constant pool,
75 // so we don't need bounds-check for reading tag.
76 u1 tag = cfs->get_u1_fast();
77 switch (tag) {
78 case JVM_CONSTANT_Class :
79 {
80 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
81 u2 name_index = cfs->get_u2_fast();
82 cp->klass_index_at_put(index, name_index);
83 }
84 break;
85 case JVM_CONSTANT_Fieldref :
86 {
87 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
88 u2 class_index = cfs->get_u2_fast();
89 u2 name_and_type_index = cfs->get_u2_fast();
90 cp->field_at_put(index, class_index, name_and_type_index);
91 }
92 break;
93 case JVM_CONSTANT_Methodref :
94 {
95 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
96 u2 class_index = cfs->get_u2_fast();
97 u2 name_and_type_index = cfs->get_u2_fast();
98 cp->method_at_put(index, class_index, name_and_type_index);
99 }
100 break;
101 case JVM_CONSTANT_InterfaceMethodref :
102 {
103 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
104 u2 class_index = cfs->get_u2_fast();
105 u2 name_and_type_index = cfs->get_u2_fast();
106 cp->interface_method_at_put(index, class_index, name_and_type_index);
107 }
108 break;
109 case JVM_CONSTANT_String :
110 {
111 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
112 u2 string_index = cfs->get_u2_fast();
113 cp->string_index_at_put(index, string_index);
114 }
115 break;
116 case JVM_CONSTANT_Integer :
117 {
118 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
119 u4 bytes = cfs->get_u4_fast();
120 cp->int_at_put(index, (jint) bytes);
121 }
122 break;
123 case JVM_CONSTANT_Float :
124 {
125 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
126 u4 bytes = cfs->get_u4_fast();
127 cp->float_at_put(index, *(jfloat*)&bytes);
128 }
129 break;
130 case JVM_CONSTANT_Long :
131 // A mangled type might cause you to overrun allocated memory
132 guarantee_property(index+1 < length,
133 "Invalid constant pool entry %u in class file %s",
134 index, CHECK);
135 {
136 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
137 u8 bytes = cfs->get_u8_fast();
138 cp->long_at_put(index, bytes);
139 }
140 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
141 break;
142 case JVM_CONSTANT_Double :
143 // A mangled type might cause you to overrun allocated memory
144 guarantee_property(index+1 < length,
145 "Invalid constant pool entry %u in class file %s",
146 index, CHECK);
147 {
148 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
149 u8 bytes = cfs->get_u8_fast();
150 cp->double_at_put(index, *(jdouble*)&bytes);
151 }
152 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
153 break;
154 case JVM_CONSTANT_NameAndType :
155 {
156 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
157 u2 name_index = cfs->get_u2_fast();
158 u2 signature_index = cfs->get_u2_fast();
159 cp->name_and_type_at_put(index, name_index, signature_index);
160 }
161 break;
162 case JVM_CONSTANT_Utf8 :
163 {
164 cfs->guarantee_more(2, CHECK); // utf8_length
165 u2 utf8_length = cfs->get_u2_fast();
166 u1* utf8_buffer = cfs->get_u1_buffer();
167 assert(utf8_buffer != NULL, "null utf8 buffer");
168 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
169 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
170 cfs->skip_u1_fast(utf8_length);
172 // Before storing the symbol, make sure it's legal
173 if (_need_verify) {
174 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
175 }
177 if (AnonymousClasses && has_cp_patch_at(index)) {
178 Handle patch = clear_cp_patch_at(index);
179 guarantee_property(java_lang_String::is_instance(patch()),
180 "Illegal utf8 patch at %d in class file %s",
181 index, CHECK);
182 char* str = java_lang_String::as_utf8_string(patch());
183 // (could use java_lang_String::as_symbol instead, but might as well batch them)
184 utf8_buffer = (u1*) str;
185 utf8_length = (int) strlen(str);
186 }
188 unsigned int hash;
189 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
190 if (result == NULL) {
191 names[names_count] = (char*)utf8_buffer;
192 lengths[names_count] = utf8_length;
193 indices[names_count] = index;
194 hashValues[names_count++] = hash;
195 if (names_count == SymbolTable::symbol_alloc_batch_size) {
196 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
197 names_count = 0;
198 }
199 } else {
200 cp->symbol_at_put(index, result);
201 }
202 }
203 break;
204 default:
205 classfile_parse_error(
206 "Unknown constant tag %u in class file %s", tag, CHECK);
207 break;
208 }
209 }
211 // Allocate the remaining symbols
212 if (names_count > 0) {
213 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
214 }
216 // Copy _current pointer of local copy back to stream().
217 #ifdef ASSERT
218 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
219 #endif
220 cfs0->set_current(cfs1.current());
221 }
223 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
225 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
226 ClassFileStream* cfs = stream();
227 constantPoolHandle nullHandle;
229 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
230 u2 length = cfs->get_u2_fast();
231 guarantee_property(
232 length >= 1, "Illegal constant pool size %u in class file %s",
233 length, CHECK_(nullHandle));
234 constantPoolOop constant_pool =
235 oopFactory::new_constantPool(length, CHECK_(nullHandle));
236 constantPoolHandle cp (THREAD, constant_pool);
238 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
240 // parsing constant pool entries
241 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
243 int index = 1; // declared outside of loops for portability
245 // first verification pass - validate cross references and fixup class and string constants
246 for (index = 1; index < length; index++) { // Index 0 is unused
247 switch (cp->tag_at(index).value()) {
248 case JVM_CONSTANT_Class :
249 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
250 break;
251 case JVM_CONSTANT_Fieldref :
252 // fall through
253 case JVM_CONSTANT_Methodref :
254 // fall through
255 case JVM_CONSTANT_InterfaceMethodref : {
256 if (!_need_verify) break;
257 int klass_ref_index = cp->klass_ref_index_at(index);
258 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
259 check_property(valid_cp_range(klass_ref_index, length) &&
260 is_klass_reference(cp, klass_ref_index),
261 "Invalid constant pool index %u in class file %s",
262 klass_ref_index,
263 CHECK_(nullHandle));
264 check_property(valid_cp_range(name_and_type_ref_index, length) &&
265 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
266 "Invalid constant pool index %u in class file %s",
267 name_and_type_ref_index,
268 CHECK_(nullHandle));
269 break;
270 }
271 case JVM_CONSTANT_String :
272 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
273 break;
274 case JVM_CONSTANT_Integer :
275 break;
276 case JVM_CONSTANT_Float :
277 break;
278 case JVM_CONSTANT_Long :
279 case JVM_CONSTANT_Double :
280 index++;
281 check_property(
282 (index < length && cp->tag_at(index).is_invalid()),
283 "Improper constant pool long/double index %u in class file %s",
284 index, CHECK_(nullHandle));
285 break;
286 case JVM_CONSTANT_NameAndType : {
287 if (!_need_verify) break;
288 int name_ref_index = cp->name_ref_index_at(index);
289 int signature_ref_index = cp->signature_ref_index_at(index);
290 check_property(
291 valid_cp_range(name_ref_index, length) &&
292 cp->tag_at(name_ref_index).is_utf8(),
293 "Invalid constant pool index %u in class file %s",
294 name_ref_index, CHECK_(nullHandle));
295 check_property(
296 valid_cp_range(signature_ref_index, length) &&
297 cp->tag_at(signature_ref_index).is_utf8(),
298 "Invalid constant pool index %u in class file %s",
299 signature_ref_index, CHECK_(nullHandle));
300 break;
301 }
302 case JVM_CONSTANT_Utf8 :
303 break;
304 case JVM_CONSTANT_UnresolvedClass : // fall-through
305 case JVM_CONSTANT_UnresolvedClassInError:
306 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
307 break;
308 case JVM_CONSTANT_ClassIndex :
309 {
310 int class_index = cp->klass_index_at(index);
311 check_property(
312 valid_cp_range(class_index, length) &&
313 cp->tag_at(class_index).is_utf8(),
314 "Invalid constant pool index %u in class file %s",
315 class_index, CHECK_(nullHandle));
316 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
317 }
318 break;
319 case JVM_CONSTANT_UnresolvedString :
320 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
321 break;
322 case JVM_CONSTANT_StringIndex :
323 {
324 int string_index = cp->string_index_at(index);
325 check_property(
326 valid_cp_range(string_index, length) &&
327 cp->tag_at(string_index).is_utf8(),
328 "Invalid constant pool index %u in class file %s",
329 string_index, CHECK_(nullHandle));
330 symbolOop sym = cp->symbol_at(string_index);
331 cp->unresolved_string_at_put(index, sym);
332 }
333 break;
334 default:
335 fatal1("bad constant pool tag value %u", cp->tag_at(index).value());
336 ShouldNotReachHere();
337 break;
338 } // end of switch
339 } // end of for
341 if (_cp_patches != NULL) {
342 // need to treat this_class specially...
343 assert(AnonymousClasses, "");
344 int this_class_index;
345 {
346 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
347 u1* mark = cfs->current();
348 u2 flags = cfs->get_u2_fast();
349 this_class_index = cfs->get_u2_fast();
350 cfs->set_current(mark); // revert to mark
351 }
353 for (index = 1; index < length; index++) { // Index 0 is unused
354 if (has_cp_patch_at(index)) {
355 guarantee_property(index != this_class_index,
356 "Illegal constant pool patch to self at %d in class file %s",
357 index, CHECK_(nullHandle));
358 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
359 }
360 }
361 // Ensure that all the patches have been used.
362 for (index = 0; index < _cp_patches->length(); index++) {
363 guarantee_property(!has_cp_patch_at(index),
364 "Unused constant pool patch at %d in class file %s",
365 index, CHECK_(nullHandle));
366 }
367 }
369 if (!_need_verify) {
370 return cp;
371 }
373 // second verification pass - checks the strings are of the right format.
374 // but not yet to the other entries
375 for (index = 1; index < length; index++) {
376 jbyte tag = cp->tag_at(index).value();
377 switch (tag) {
378 case JVM_CONSTANT_UnresolvedClass: {
379 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
380 // check the name, even if _cp_patches will overwrite it
381 verify_legal_class_name(class_name, CHECK_(nullHandle));
382 break;
383 }
384 case JVM_CONSTANT_Fieldref:
385 case JVM_CONSTANT_Methodref:
386 case JVM_CONSTANT_InterfaceMethodref: {
387 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
388 // already verified to be utf8
389 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
390 // already verified to be utf8
391 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
392 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
393 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
394 if (tag == JVM_CONSTANT_Fieldref) {
395 verify_legal_field_name(name, CHECK_(nullHandle));
396 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
397 } else {
398 verify_legal_method_name(name, CHECK_(nullHandle));
399 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
400 if (tag == JVM_CONSTANT_Methodref) {
401 // 4509014: If a class method name begins with '<', it must be "<init>".
402 assert(!name.is_null(), "method name in constant pool is null");
403 unsigned int name_len = name->utf8_length();
404 assert(name_len > 0, "bad method name"); // already verified as legal name
405 if (name->byte_at(0) == '<') {
406 if (name() != vmSymbols::object_initializer_name()) {
407 classfile_parse_error(
408 "Bad method name at constant pool index %u in class file %s",
409 name_ref_index, CHECK_(nullHandle));
410 }
411 }
412 }
413 }
414 break;
415 }
416 } // end of switch
417 } // end of for
419 return cp;
420 }
423 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
424 assert(AnonymousClasses, "");
425 BasicType patch_type = T_VOID;
426 switch (cp->tag_at(index).value()) {
428 case JVM_CONSTANT_UnresolvedClass :
429 // Patching a class means pre-resolving it.
430 // The name in the constant pool is ignored.
431 if (patch->klass() == SystemDictionary::class_klass()) { // %%% java_lang_Class::is_instance
432 guarantee_property(!java_lang_Class::is_primitive(patch()),
433 "Illegal class patch at %d in class file %s",
434 index, CHECK);
435 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
436 } else {
437 guarantee_property(java_lang_String::is_instance(patch()),
438 "Illegal class patch at %d in class file %s",
439 index, CHECK);
440 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
441 cp->unresolved_klass_at_put(index, name());
442 }
443 break;
445 case JVM_CONSTANT_UnresolvedString :
446 // Patching a string means pre-resolving it.
447 // The spelling in the constant pool is ignored.
448 // The constant reference may be any object whatever.
449 // If it is not a real interned string, the constant is referred
450 // to as a "pseudo-string", and must be presented to the CP
451 // explicitly, because it may require scavenging.
452 cp->pseudo_string_at_put(index, patch());
453 break;
455 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
456 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
457 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
458 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
459 patch_prim:
460 {
461 jvalue value;
462 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
463 guarantee_property(value_type == patch_type,
464 "Illegal primitive patch at %d in class file %s",
465 index, CHECK);
466 switch (value_type) {
467 case T_INT: cp->int_at_put(index, value.i); break;
468 case T_FLOAT: cp->float_at_put(index, value.f); break;
469 case T_LONG: cp->long_at_put(index, value.j); break;
470 case T_DOUBLE: cp->double_at_put(index, value.d); break;
471 default: assert(false, "");
472 }
473 }
474 break;
476 default:
477 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
478 guarantee_property(!has_cp_patch_at(index),
479 "Illegal unexpected patch at %d in class file %s",
480 index, CHECK);
481 return;
482 }
484 // On fall-through, mark the patch as used.
485 clear_cp_patch_at(index);
486 }
490 class NameSigHash: public ResourceObj {
491 public:
492 symbolOop _name; // name
493 symbolOop _sig; // signature
494 NameSigHash* _next; // Next entry in hash table
495 };
498 #define HASH_ROW_SIZE 256
500 unsigned int hash(symbolOop name, symbolOop sig) {
501 unsigned int raw_hash = 0;
502 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
503 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
505 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
506 }
509 void initialize_hashtable(NameSigHash** table) {
510 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
511 }
513 // Return false if the name/sig combination is found in table.
514 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
515 // The old format checker uses heap sort to find duplicates.
516 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
517 // of table since we don't expect symbolOop's to move.
518 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
519 assert(name != NULL, "name in constant pool is NULL");
521 // First lookup for duplicates
522 int index = hash(name, sig);
523 NameSigHash* entry = table[index];
524 while (entry != NULL) {
525 if (entry->_name == name && entry->_sig == sig) {
526 return false;
527 }
528 entry = entry->_next;
529 }
531 // No duplicate is found, allocate a new entry and fill it.
532 entry = new NameSigHash();
533 entry->_name = name;
534 entry->_sig = sig;
536 // Insert into hash table
537 entry->_next = table[index];
538 table[index] = entry;
540 return true;
541 }
544 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
545 int length,
546 Handle class_loader,
547 Handle protection_domain,
548 PerfTraceTime* vmtimer,
549 symbolHandle class_name,
550 TRAPS) {
551 ClassFileStream* cfs = stream();
552 assert(length > 0, "only called for length>0");
553 objArrayHandle nullHandle;
554 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
555 objArrayHandle interfaces (THREAD, interface_oop);
557 int index;
558 for (index = 0; index < length; index++) {
559 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
560 KlassHandle interf;
561 check_property(
562 valid_cp_range(interface_index, cp->length()) &&
563 is_klass_reference(cp, interface_index),
564 "Interface name has bad constant pool index %u in class file %s",
565 interface_index, CHECK_(nullHandle));
566 if (cp->tag_at(interface_index).is_klass()) {
567 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
568 } else {
569 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
571 // Don't need to check legal name because it's checked when parsing constant pool.
572 // But need to make sure it's not an array type.
573 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
574 "Bad interface name in class file %s", CHECK_(nullHandle));
576 vmtimer->suspend(); // do not count recursive loading twice
577 // Call resolve_super so classcircularity is checked
578 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
579 unresolved_klass, class_loader, protection_domain,
580 false, CHECK_(nullHandle));
581 interf = KlassHandle(THREAD, k);
582 vmtimer->resume();
584 if (LinkWellKnownClasses) // my super type is well known to me
585 cp->klass_at_put(interface_index, interf()); // eagerly resolve
586 }
588 if (!Klass::cast(interf())->is_interface()) {
589 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
590 }
591 interfaces->obj_at_put(index, interf());
592 }
594 if (!_need_verify || length <= 1) {
595 return interfaces;
596 }
598 // Check if there's any duplicates in interfaces
599 ResourceMark rm(THREAD);
600 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
601 THREAD, NameSigHash*, HASH_ROW_SIZE);
602 initialize_hashtable(interface_names);
603 bool dup = false;
604 {
605 debug_only(No_Safepoint_Verifier nsv;)
606 for (index = 0; index < length; index++) {
607 klassOop k = (klassOop)interfaces->obj_at(index);
608 symbolOop name = instanceKlass::cast(k)->name();
609 // If no duplicates, add (name, NULL) in hashtable interface_names.
610 if (!put_after_lookup(name, NULL, interface_names)) {
611 dup = true;
612 break;
613 }
614 }
615 }
616 if (dup) {
617 classfile_parse_error("Duplicate interface name in class file %s",
618 CHECK_(nullHandle));
619 }
621 return interfaces;
622 }
625 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
626 // Make sure the constant pool entry is of a type appropriate to this field
627 guarantee_property(
628 (constantvalue_index > 0 &&
629 constantvalue_index < cp->length()),
630 "Bad initial value index %u in ConstantValue attribute in class file %s",
631 constantvalue_index, CHECK);
632 constantTag value_type = cp->tag_at(constantvalue_index);
633 switch ( cp->basic_type_for_signature_at(signature_index) ) {
634 case T_LONG:
635 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
636 break;
637 case T_FLOAT:
638 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
639 break;
640 case T_DOUBLE:
641 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
642 break;
643 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
644 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
645 break;
646 case T_OBJECT:
647 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18)
648 && (value_type.is_string() || value_type.is_unresolved_string())),
649 "Bad string initial value in class file %s", CHECK);
650 break;
651 default:
652 classfile_parse_error(
653 "Unable to set initial value %u in class file %s",
654 constantvalue_index, CHECK);
655 }
656 }
659 // Parse attributes for a field.
660 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
661 u2 attributes_count,
662 bool is_static, u2 signature_index,
663 u2* constantvalue_index_addr,
664 bool* is_synthetic_addr,
665 u2* generic_signature_index_addr,
666 typeArrayHandle* field_annotations,
667 TRAPS) {
668 ClassFileStream* cfs = stream();
669 assert(attributes_count > 0, "length should be greater than 0");
670 u2 constantvalue_index = 0;
671 u2 generic_signature_index = 0;
672 bool is_synthetic = false;
673 u1* runtime_visible_annotations = NULL;
674 int runtime_visible_annotations_length = 0;
675 u1* runtime_invisible_annotations = NULL;
676 int runtime_invisible_annotations_length = 0;
677 while (attributes_count--) {
678 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
679 u2 attribute_name_index = cfs->get_u2_fast();
680 u4 attribute_length = cfs->get_u4_fast();
681 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
682 cp->tag_at(attribute_name_index).is_utf8(),
683 "Invalid field attribute index %u in class file %s",
684 attribute_name_index,
685 CHECK);
686 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
687 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
688 // ignore if non-static
689 if (constantvalue_index != 0) {
690 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
691 }
692 check_property(
693 attribute_length == 2,
694 "Invalid ConstantValue field attribute length %u in class file %s",
695 attribute_length, CHECK);
696 constantvalue_index = cfs->get_u2(CHECK);
697 if (_need_verify) {
698 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
699 }
700 } else if (attribute_name == vmSymbols::tag_synthetic()) {
701 if (attribute_length != 0) {
702 classfile_parse_error(
703 "Invalid Synthetic field attribute length %u in class file %s",
704 attribute_length, CHECK);
705 }
706 is_synthetic = true;
707 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
708 if (attribute_length != 0) {
709 classfile_parse_error(
710 "Invalid Deprecated field attribute length %u in class file %s",
711 attribute_length, CHECK);
712 }
713 } else if (_major_version >= JAVA_1_5_VERSION) {
714 if (attribute_name == vmSymbols::tag_signature()) {
715 if (attribute_length != 2) {
716 classfile_parse_error(
717 "Wrong size %u for field's Signature attribute in class file %s",
718 attribute_length, CHECK);
719 }
720 generic_signature_index = cfs->get_u2(CHECK);
721 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
722 runtime_visible_annotations_length = attribute_length;
723 runtime_visible_annotations = cfs->get_u1_buffer();
724 assert(runtime_visible_annotations != NULL, "null visible annotations");
725 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
726 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
727 runtime_invisible_annotations_length = attribute_length;
728 runtime_invisible_annotations = cfs->get_u1_buffer();
729 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
730 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
731 } else {
732 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
733 }
734 } else {
735 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
736 }
737 }
739 *constantvalue_index_addr = constantvalue_index;
740 *is_synthetic_addr = is_synthetic;
741 *generic_signature_index_addr = generic_signature_index;
742 *field_annotations = assemble_annotations(runtime_visible_annotations,
743 runtime_visible_annotations_length,
744 runtime_invisible_annotations,
745 runtime_invisible_annotations_length,
746 CHECK);
747 return;
748 }
751 // Field allocation types. Used for computing field offsets.
753 enum FieldAllocationType {
754 STATIC_OOP, // Oops
755 STATIC_BYTE, // Boolean, Byte, char
756 STATIC_SHORT, // shorts
757 STATIC_WORD, // ints
758 STATIC_DOUBLE, // long or double
759 STATIC_ALIGNED_DOUBLE,// aligned long or double
760 NONSTATIC_OOP,
761 NONSTATIC_BYTE,
762 NONSTATIC_SHORT,
763 NONSTATIC_WORD,
764 NONSTATIC_DOUBLE,
765 NONSTATIC_ALIGNED_DOUBLE
766 };
769 struct FieldAllocationCount {
770 int static_oop_count;
771 int static_byte_count;
772 int static_short_count;
773 int static_word_count;
774 int static_double_count;
775 int nonstatic_oop_count;
776 int nonstatic_byte_count;
777 int nonstatic_short_count;
778 int nonstatic_word_count;
779 int nonstatic_double_count;
780 };
782 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
783 struct FieldAllocationCount *fac,
784 objArrayHandle* fields_annotations, TRAPS) {
785 ClassFileStream* cfs = stream();
786 typeArrayHandle nullHandle;
787 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
788 u2 length = cfs->get_u2_fast();
789 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
790 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
791 typeArrayHandle fields(THREAD, new_fields);
793 int index = 0;
794 typeArrayHandle field_annotations;
795 for (int n = 0; n < length; n++) {
796 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
798 AccessFlags access_flags;
799 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
800 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
801 access_flags.set_flags(flags);
803 u2 name_index = cfs->get_u2_fast();
804 int cp_size = cp->length();
805 check_property(
806 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
807 "Invalid constant pool index %u for field name in class file %s",
808 name_index, CHECK_(nullHandle));
809 symbolHandle name(THREAD, cp->symbol_at(name_index));
810 verify_legal_field_name(name, CHECK_(nullHandle));
812 u2 signature_index = cfs->get_u2_fast();
813 check_property(
814 valid_cp_range(signature_index, cp_size) &&
815 cp->tag_at(signature_index).is_utf8(),
816 "Invalid constant pool index %u for field signature in class file %s",
817 signature_index, CHECK_(nullHandle));
818 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
819 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
821 u2 constantvalue_index = 0;
822 bool is_synthetic = false;
823 u2 generic_signature_index = 0;
824 bool is_static = access_flags.is_static();
826 u2 attributes_count = cfs->get_u2_fast();
827 if (attributes_count > 0) {
828 parse_field_attributes(cp, attributes_count, is_static, signature_index,
829 &constantvalue_index, &is_synthetic,
830 &generic_signature_index, &field_annotations,
831 CHECK_(nullHandle));
832 if (field_annotations.not_null()) {
833 if (fields_annotations->is_null()) {
834 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
835 *fields_annotations = objArrayHandle(THREAD, md);
836 }
837 (*fields_annotations)->obj_at_put(n, field_annotations());
838 }
839 if (is_synthetic) {
840 access_flags.set_is_synthetic();
841 }
842 }
844 fields->short_at_put(index++, access_flags.as_short());
845 fields->short_at_put(index++, name_index);
846 fields->short_at_put(index++, signature_index);
847 fields->short_at_put(index++, constantvalue_index);
849 // Remember how many oops we encountered and compute allocation type
850 BasicType type = cp->basic_type_for_signature_at(signature_index);
851 FieldAllocationType atype;
852 if ( is_static ) {
853 switch ( type ) {
854 case T_BOOLEAN:
855 case T_BYTE:
856 fac->static_byte_count++;
857 atype = STATIC_BYTE;
858 break;
859 case T_LONG:
860 case T_DOUBLE:
861 if (Universe::field_type_should_be_aligned(type)) {
862 atype = STATIC_ALIGNED_DOUBLE;
863 } else {
864 atype = STATIC_DOUBLE;
865 }
866 fac->static_double_count++;
867 break;
868 case T_CHAR:
869 case T_SHORT:
870 fac->static_short_count++;
871 atype = STATIC_SHORT;
872 break;
873 case T_FLOAT:
874 case T_INT:
875 fac->static_word_count++;
876 atype = STATIC_WORD;
877 break;
878 case T_ARRAY:
879 case T_OBJECT:
880 fac->static_oop_count++;
881 atype = STATIC_OOP;
882 break;
883 case T_ADDRESS:
884 case T_VOID:
885 default:
886 assert(0, "bad field type");
887 }
888 } else {
889 switch ( type ) {
890 case T_BOOLEAN:
891 case T_BYTE:
892 fac->nonstatic_byte_count++;
893 atype = NONSTATIC_BYTE;
894 break;
895 case T_LONG:
896 case T_DOUBLE:
897 if (Universe::field_type_should_be_aligned(type)) {
898 atype = NONSTATIC_ALIGNED_DOUBLE;
899 } else {
900 atype = NONSTATIC_DOUBLE;
901 }
902 fac->nonstatic_double_count++;
903 break;
904 case T_CHAR:
905 case T_SHORT:
906 fac->nonstatic_short_count++;
907 atype = NONSTATIC_SHORT;
908 break;
909 case T_FLOAT:
910 case T_INT:
911 fac->nonstatic_word_count++;
912 atype = NONSTATIC_WORD;
913 break;
914 case T_ARRAY:
915 case T_OBJECT:
916 fac->nonstatic_oop_count++;
917 atype = NONSTATIC_OOP;
918 break;
919 case T_ADDRESS:
920 case T_VOID:
921 default:
922 assert(0, "bad field type");
923 }
924 }
926 // The correct offset is computed later (all oop fields will be located together)
927 // We temporarily store the allocation type in the offset field
928 fields->short_at_put(index++, atype);
929 fields->short_at_put(index++, 0); // Clear out high word of byte offset
930 fields->short_at_put(index++, generic_signature_index);
931 }
933 if (_need_verify && length > 1) {
934 // Check duplicated fields
935 ResourceMark rm(THREAD);
936 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
937 THREAD, NameSigHash*, HASH_ROW_SIZE);
938 initialize_hashtable(names_and_sigs);
939 bool dup = false;
940 {
941 debug_only(No_Safepoint_Verifier nsv;)
942 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
943 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
944 symbolOop name = cp->symbol_at(name_index);
945 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
946 symbolOop sig = cp->symbol_at(sig_index);
947 // If no duplicates, add name/signature in hashtable names_and_sigs.
948 if (!put_after_lookup(name, sig, names_and_sigs)) {
949 dup = true;
950 break;
951 }
952 }
953 }
954 if (dup) {
955 classfile_parse_error("Duplicate field name&signature in class file %s",
956 CHECK_(nullHandle));
957 }
958 }
960 return fields;
961 }
964 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
965 while (length-- > 0) {
966 *dest++ = Bytes::get_Java_u2((u1*) (src++));
967 }
968 }
971 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
972 u4 exception_table_length,
973 constantPoolHandle cp,
974 TRAPS) {
975 ClassFileStream* cfs = stream();
976 typeArrayHandle nullHandle;
978 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
979 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
980 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
982 int index = 0;
983 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
984 for (unsigned int i = 0; i < exception_table_length; i++) {
985 u2 start_pc = cfs->get_u2_fast();
986 u2 end_pc = cfs->get_u2_fast();
987 u2 handler_pc = cfs->get_u2_fast();
988 u2 catch_type_index = cfs->get_u2_fast();
989 // Will check legal target after parsing code array in verifier.
990 if (_need_verify) {
991 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
992 "Illegal exception table range in class file %s", CHECK_(nullHandle));
993 guarantee_property(handler_pc < code_length,
994 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
995 if (catch_type_index != 0) {
996 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
997 is_klass_reference(cp, catch_type_index),
998 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
999 }
1000 }
1001 exception_handlers->int_at_put(index++, start_pc);
1002 exception_handlers->int_at_put(index++, end_pc);
1003 exception_handlers->int_at_put(index++, handler_pc);
1004 exception_handlers->int_at_put(index++, catch_type_index);
1005 }
1006 return exception_handlers;
1007 }
1009 void ClassFileParser::parse_linenumber_table(
1010 u4 code_attribute_length, u4 code_length,
1011 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1012 ClassFileStream* cfs = stream();
1013 unsigned int num_entries = cfs->get_u2(CHECK);
1015 // Each entry is a u2 start_pc, and a u2 line_number
1016 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1018 // Verify line number attribute and table length
1019 check_property(
1020 code_attribute_length == sizeof(u2) + length_in_bytes,
1021 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1023 cfs->guarantee_more(length_in_bytes, CHECK);
1025 if ((*write_stream) == NULL) {
1026 if (length_in_bytes > fixed_buffer_size) {
1027 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1028 } else {
1029 (*write_stream) = new CompressedLineNumberWriteStream(
1030 linenumbertable_buffer, fixed_buffer_size);
1031 }
1032 }
1034 while (num_entries-- > 0) {
1035 u2 bci = cfs->get_u2_fast(); // start_pc
1036 u2 line = cfs->get_u2_fast(); // line_number
1037 guarantee_property(bci < code_length,
1038 "Invalid pc in LineNumberTable in class file %s", CHECK);
1039 (*write_stream)->write_pair(bci, line);
1040 }
1041 }
1044 // Class file LocalVariableTable elements.
1045 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1046 public:
1047 u2 start_bci;
1048 u2 length;
1049 u2 name_cp_index;
1050 u2 descriptor_cp_index;
1051 u2 slot;
1052 };
1055 class LVT_Hash: public CHeapObj {
1056 public:
1057 LocalVariableTableElement *_elem; // element
1058 LVT_Hash* _next; // Next entry in hash table
1059 };
1061 unsigned int hash(LocalVariableTableElement *elem) {
1062 unsigned int raw_hash = elem->start_bci;
1064 raw_hash = elem->length + raw_hash * 37;
1065 raw_hash = elem->name_cp_index + raw_hash * 37;
1066 raw_hash = elem->slot + raw_hash * 37;
1068 return raw_hash % HASH_ROW_SIZE;
1069 }
1071 void initialize_hashtable(LVT_Hash** table) {
1072 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1073 table[i] = NULL;
1074 }
1075 }
1077 void clear_hashtable(LVT_Hash** table) {
1078 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1079 LVT_Hash* current = table[i];
1080 LVT_Hash* next;
1081 while (current != NULL) {
1082 next = current->_next;
1083 current->_next = NULL;
1084 delete(current);
1085 current = next;
1086 }
1087 table[i] = NULL;
1088 }
1089 }
1091 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1092 LVT_Hash* entry = table[index];
1094 /*
1095 * 3-tuple start_bci/length/slot has to be unique key,
1096 * so the following comparison seems to be redundant:
1097 * && elem->name_cp_index == entry->_elem->name_cp_index
1098 */
1099 while (entry != NULL) {
1100 if (elem->start_bci == entry->_elem->start_bci
1101 && elem->length == entry->_elem->length
1102 && elem->name_cp_index == entry->_elem->name_cp_index
1103 && elem->slot == entry->_elem->slot
1104 ) {
1105 return entry;
1106 }
1107 entry = entry->_next;
1108 }
1109 return NULL;
1110 }
1112 // Return false if the local variable is found in table.
1113 // Return true if no duplicate is found.
1114 // And local variable is added as a new entry in table.
1115 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1116 // First lookup for duplicates
1117 int index = hash(elem);
1118 LVT_Hash* entry = LVT_lookup(elem, index, table);
1120 if (entry != NULL) {
1121 return false;
1122 }
1123 // No duplicate is found, allocate a new entry and fill it.
1124 if ((entry = new LVT_Hash()) == NULL) {
1125 return false;
1126 }
1127 entry->_elem = elem;
1129 // Insert into hash table
1130 entry->_next = table[index];
1131 table[index] = entry;
1133 return true;
1134 }
1136 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1137 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1138 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1139 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1140 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1141 lvt->signature_cp_index = 0;
1142 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1143 }
1145 // Function is used to parse both attributes:
1146 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1147 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1148 u2 max_locals,
1149 u4 code_attribute_length,
1150 constantPoolHandle cp,
1151 u2* localvariable_table_length,
1152 bool isLVTT,
1153 TRAPS) {
1154 ClassFileStream* cfs = stream();
1155 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1156 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1157 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1158 // Verify local variable table attribute has right length
1159 if (_need_verify) {
1160 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1161 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1162 }
1163 u2* localvariable_table_start = cfs->get_u2_buffer();
1164 assert(localvariable_table_start != NULL, "null local variable table");
1165 if (!_need_verify) {
1166 cfs->skip_u2_fast(size);
1167 } else {
1168 cfs->guarantee_more(size * 2, CHECK_NULL);
1169 for(int i = 0; i < (*localvariable_table_length); i++) {
1170 u2 start_pc = cfs->get_u2_fast();
1171 u2 length = cfs->get_u2_fast();
1172 u2 name_index = cfs->get_u2_fast();
1173 u2 descriptor_index = cfs->get_u2_fast();
1174 u2 index = cfs->get_u2_fast();
1175 // Assign to a u4 to avoid overflow
1176 u4 end_pc = (u4)start_pc + (u4)length;
1178 if (start_pc >= code_length) {
1179 classfile_parse_error(
1180 "Invalid start_pc %u in %s in class file %s",
1181 start_pc, tbl_name, CHECK_NULL);
1182 }
1183 if (end_pc > code_length) {
1184 classfile_parse_error(
1185 "Invalid length %u in %s in class file %s",
1186 length, tbl_name, CHECK_NULL);
1187 }
1188 int cp_size = cp->length();
1189 guarantee_property(
1190 valid_cp_range(name_index, cp_size) &&
1191 cp->tag_at(name_index).is_utf8(),
1192 "Name index %u in %s has bad constant type in class file %s",
1193 name_index, tbl_name, CHECK_NULL);
1194 guarantee_property(
1195 valid_cp_range(descriptor_index, cp_size) &&
1196 cp->tag_at(descriptor_index).is_utf8(),
1197 "Signature index %u in %s has bad constant type in class file %s",
1198 descriptor_index, tbl_name, CHECK_NULL);
1200 symbolHandle name(THREAD, cp->symbol_at(name_index));
1201 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1202 verify_legal_field_name(name, CHECK_NULL);
1203 u2 extra_slot = 0;
1204 if (!isLVTT) {
1205 verify_legal_field_signature(name, sig, CHECK_NULL);
1207 // 4894874: check special cases for double and long local variables
1208 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1209 sig() == vmSymbols::type_signature(T_LONG)) {
1210 extra_slot = 1;
1211 }
1212 }
1213 guarantee_property((index + extra_slot) < max_locals,
1214 "Invalid index %u in %s in class file %s",
1215 index, tbl_name, CHECK_NULL);
1216 }
1217 }
1218 return localvariable_table_start;
1219 }
1222 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1223 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1224 ClassFileStream* cfs = stream();
1225 u2 index = 0; // index in the array with long/double occupying two slots
1226 u4 i1 = *u1_index;
1227 u4 i2 = *u2_index + 1;
1228 for(int i = 0; i < array_length; i++) {
1229 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1230 index++;
1231 if (tag == ITEM_Long || tag == ITEM_Double) {
1232 index++;
1233 } else if (tag == ITEM_Object) {
1234 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1235 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1236 is_klass_reference(cp, class_index),
1237 "Bad class index %u in StackMap in class file %s",
1238 class_index, CHECK);
1239 } else if (tag == ITEM_Uninitialized) {
1240 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1241 guarantee_property(
1242 offset < code_length,
1243 "Bad uninitialized type offset %u in StackMap in class file %s",
1244 offset, CHECK);
1245 } else {
1246 guarantee_property(
1247 tag <= (u1)ITEM_Uninitialized,
1248 "Unknown variable type %u in StackMap in class file %s",
1249 tag, CHECK);
1250 }
1251 }
1252 u2_array[*u2_index] = index;
1253 *u1_index = i1;
1254 *u2_index = i2;
1255 }
1257 typeArrayOop ClassFileParser::parse_stackmap_table(
1258 u4 code_attribute_length, TRAPS) {
1259 if (code_attribute_length == 0)
1260 return NULL;
1262 ClassFileStream* cfs = stream();
1263 u1* stackmap_table_start = cfs->get_u1_buffer();
1264 assert(stackmap_table_start != NULL, "null stackmap table");
1266 // check code_attribute_length first
1267 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1269 if (!_need_verify && !DumpSharedSpaces) {
1270 return NULL;
1271 }
1273 typeArrayOop stackmap_data =
1274 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1276 stackmap_data->set_length(code_attribute_length);
1277 memcpy((void*)stackmap_data->byte_at_addr(0),
1278 (void*)stackmap_table_start, code_attribute_length);
1279 return stackmap_data;
1280 }
1282 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1283 u4 method_attribute_length,
1284 constantPoolHandle cp, TRAPS) {
1285 ClassFileStream* cfs = stream();
1286 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1287 *checked_exceptions_length = cfs->get_u2_fast();
1288 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1289 u2* checked_exceptions_start = cfs->get_u2_buffer();
1290 assert(checked_exceptions_start != NULL, "null checked exceptions");
1291 if (!_need_verify) {
1292 cfs->skip_u2_fast(size);
1293 } else {
1294 // Verify each value in the checked exception table
1295 u2 checked_exception;
1296 u2 len = *checked_exceptions_length;
1297 cfs->guarantee_more(2 * len, CHECK_NULL);
1298 for (int i = 0; i < len; i++) {
1299 checked_exception = cfs->get_u2_fast();
1300 check_property(
1301 valid_cp_range(checked_exception, cp->length()) &&
1302 is_klass_reference(cp, checked_exception),
1303 "Exception name has bad type at constant pool %u in class file %s",
1304 checked_exception, CHECK_NULL);
1305 }
1306 }
1307 // check exceptions attribute length
1308 if (_need_verify) {
1309 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1310 sizeof(u2) * size),
1311 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1312 }
1313 return checked_exceptions_start;
1314 }
1317 #define MAX_ARGS_SIZE 255
1318 #define MAX_CODE_SIZE 65535
1319 #define INITIAL_MAX_LVT_NUMBER 256
1321 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1322 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1323 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1324 // entire method attribute is parsed.
1325 //
1326 // The promoted_flags parameter is used to pass relevant access_flags
1327 // from the method back up to the containing klass. These flag values
1328 // are added to klass's access_flags.
1330 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1331 AccessFlags *promoted_flags,
1332 typeArrayHandle* method_annotations,
1333 typeArrayHandle* method_parameter_annotations,
1334 typeArrayHandle* method_default_annotations,
1335 TRAPS) {
1336 ClassFileStream* cfs = stream();
1337 methodHandle nullHandle;
1338 ResourceMark rm(THREAD);
1339 // Parse fixed parts
1340 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1342 int flags = cfs->get_u2_fast();
1343 u2 name_index = cfs->get_u2_fast();
1344 int cp_size = cp->length();
1345 check_property(
1346 valid_cp_range(name_index, cp_size) &&
1347 cp->tag_at(name_index).is_utf8(),
1348 "Illegal constant pool index %u for method name in class file %s",
1349 name_index, CHECK_(nullHandle));
1350 symbolHandle name(THREAD, cp->symbol_at(name_index));
1351 verify_legal_method_name(name, CHECK_(nullHandle));
1353 u2 signature_index = cfs->get_u2_fast();
1354 guarantee_property(
1355 valid_cp_range(signature_index, cp_size) &&
1356 cp->tag_at(signature_index).is_utf8(),
1357 "Illegal constant pool index %u for method signature in class file %s",
1358 signature_index, CHECK_(nullHandle));
1359 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1361 AccessFlags access_flags;
1362 if (name == vmSymbols::class_initializer_name()) {
1363 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1364 flags = JVM_ACC_STATIC;
1365 } else {
1366 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1367 }
1369 int args_size = -1; // only used when _need_verify is true
1370 if (_need_verify) {
1371 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1372 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1373 if (args_size > MAX_ARGS_SIZE) {
1374 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1375 }
1376 }
1378 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1380 // Default values for code and exceptions attribute elements
1381 u2 max_stack = 0;
1382 u2 max_locals = 0;
1383 u4 code_length = 0;
1384 u1* code_start = 0;
1385 u2 exception_table_length = 0;
1386 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1387 u2 checked_exceptions_length = 0;
1388 u2* checked_exceptions_start = NULL;
1389 CompressedLineNumberWriteStream* linenumber_table = NULL;
1390 int linenumber_table_length = 0;
1391 int total_lvt_length = 0;
1392 u2 lvt_cnt = 0;
1393 u2 lvtt_cnt = 0;
1394 bool lvt_allocated = false;
1395 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1396 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1397 u2* localvariable_table_length;
1398 u2** localvariable_table_start;
1399 u2* localvariable_type_table_length;
1400 u2** localvariable_type_table_start;
1401 bool parsed_code_attribute = false;
1402 bool parsed_checked_exceptions_attribute = false;
1403 bool parsed_stackmap_attribute = false;
1404 // stackmap attribute - JDK1.5
1405 typeArrayHandle stackmap_data;
1406 u2 generic_signature_index = 0;
1407 u1* runtime_visible_annotations = NULL;
1408 int runtime_visible_annotations_length = 0;
1409 u1* runtime_invisible_annotations = NULL;
1410 int runtime_invisible_annotations_length = 0;
1411 u1* runtime_visible_parameter_annotations = NULL;
1412 int runtime_visible_parameter_annotations_length = 0;
1413 u1* runtime_invisible_parameter_annotations = NULL;
1414 int runtime_invisible_parameter_annotations_length = 0;
1415 u1* annotation_default = NULL;
1416 int annotation_default_length = 0;
1418 // Parse code and exceptions attribute
1419 u2 method_attributes_count = cfs->get_u2_fast();
1420 while (method_attributes_count--) {
1421 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1422 u2 method_attribute_name_index = cfs->get_u2_fast();
1423 u4 method_attribute_length = cfs->get_u4_fast();
1424 check_property(
1425 valid_cp_range(method_attribute_name_index, cp_size) &&
1426 cp->tag_at(method_attribute_name_index).is_utf8(),
1427 "Invalid method attribute name index %u in class file %s",
1428 method_attribute_name_index, CHECK_(nullHandle));
1430 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1431 if (method_attribute_name == vmSymbols::tag_code()) {
1432 // Parse Code attribute
1433 if (_need_verify) {
1434 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1435 "Code attribute in native or abstract methods in class file %s",
1436 CHECK_(nullHandle));
1437 }
1438 if (parsed_code_attribute) {
1439 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1440 }
1441 parsed_code_attribute = true;
1443 // Stack size, locals size, and code size
1444 if (_major_version == 45 && _minor_version <= 2) {
1445 cfs->guarantee_more(4, CHECK_(nullHandle));
1446 max_stack = cfs->get_u1_fast();
1447 max_locals = cfs->get_u1_fast();
1448 code_length = cfs->get_u2_fast();
1449 } else {
1450 cfs->guarantee_more(8, CHECK_(nullHandle));
1451 max_stack = cfs->get_u2_fast();
1452 max_locals = cfs->get_u2_fast();
1453 code_length = cfs->get_u4_fast();
1454 }
1455 if (_need_verify) {
1456 guarantee_property(args_size <= max_locals,
1457 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1458 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1459 "Invalid method Code length %u in class file %s",
1460 code_length, CHECK_(nullHandle));
1461 }
1462 // Code pointer
1463 code_start = cfs->get_u1_buffer();
1464 assert(code_start != NULL, "null code start");
1465 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1466 cfs->skip_u1_fast(code_length);
1468 // Exception handler table
1469 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1470 exception_table_length = cfs->get_u2_fast();
1471 if (exception_table_length > 0) {
1472 exception_handlers =
1473 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1474 }
1476 // Parse additional attributes in code attribute
1477 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1478 u2 code_attributes_count = cfs->get_u2_fast();
1480 unsigned int calculated_attribute_length = 0;
1482 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1483 calculated_attribute_length =
1484 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1485 } else {
1486 // max_stack, locals and length are smaller in pre-version 45.2 classes
1487 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1488 }
1489 calculated_attribute_length +=
1490 code_length +
1491 sizeof(exception_table_length) +
1492 sizeof(code_attributes_count) +
1493 exception_table_length *
1494 ( sizeof(u2) + // start_pc
1495 sizeof(u2) + // end_pc
1496 sizeof(u2) + // handler_pc
1497 sizeof(u2) ); // catch_type_index
1499 while (code_attributes_count--) {
1500 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1501 u2 code_attribute_name_index = cfs->get_u2_fast();
1502 u4 code_attribute_length = cfs->get_u4_fast();
1503 calculated_attribute_length += code_attribute_length +
1504 sizeof(code_attribute_name_index) +
1505 sizeof(code_attribute_length);
1506 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1507 cp->tag_at(code_attribute_name_index).is_utf8(),
1508 "Invalid code attribute name index %u in class file %s",
1509 code_attribute_name_index,
1510 CHECK_(nullHandle));
1511 if (LoadLineNumberTables &&
1512 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1513 // Parse and compress line number table
1514 parse_linenumber_table(code_attribute_length, code_length,
1515 &linenumber_table, CHECK_(nullHandle));
1517 } else if (LoadLocalVariableTables &&
1518 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1519 // Parse local variable table
1520 if (!lvt_allocated) {
1521 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1522 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1523 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1524 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1525 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1526 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1527 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1528 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1529 lvt_allocated = true;
1530 }
1531 if (lvt_cnt == max_lvt_cnt) {
1532 max_lvt_cnt <<= 1;
1533 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1534 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1535 }
1536 localvariable_table_start[lvt_cnt] =
1537 parse_localvariable_table(code_length,
1538 max_locals,
1539 code_attribute_length,
1540 cp,
1541 &localvariable_table_length[lvt_cnt],
1542 false, // is not LVTT
1543 CHECK_(nullHandle));
1544 total_lvt_length += localvariable_table_length[lvt_cnt];
1545 lvt_cnt++;
1546 } else if (LoadLocalVariableTypeTables &&
1547 _major_version >= JAVA_1_5_VERSION &&
1548 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1549 if (!lvt_allocated) {
1550 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1551 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1552 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1553 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1554 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1555 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1556 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1557 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1558 lvt_allocated = true;
1559 }
1560 // Parse local variable type table
1561 if (lvtt_cnt == max_lvtt_cnt) {
1562 max_lvtt_cnt <<= 1;
1563 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1564 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1565 }
1566 localvariable_type_table_start[lvtt_cnt] =
1567 parse_localvariable_table(code_length,
1568 max_locals,
1569 code_attribute_length,
1570 cp,
1571 &localvariable_type_table_length[lvtt_cnt],
1572 true, // is LVTT
1573 CHECK_(nullHandle));
1574 lvtt_cnt++;
1575 } else if (UseSplitVerifier &&
1576 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1577 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1578 // Stack map is only needed by the new verifier in JDK1.5.
1579 if (parsed_stackmap_attribute) {
1580 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1581 }
1582 typeArrayOop sm =
1583 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1584 stackmap_data = typeArrayHandle(THREAD, sm);
1585 parsed_stackmap_attribute = true;
1586 } else {
1587 // Skip unknown attributes
1588 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1589 }
1590 }
1591 // check method attribute length
1592 if (_need_verify) {
1593 guarantee_property(method_attribute_length == calculated_attribute_length,
1594 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1595 }
1596 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1597 // Parse Exceptions attribute
1598 if (parsed_checked_exceptions_attribute) {
1599 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1600 }
1601 parsed_checked_exceptions_attribute = true;
1602 checked_exceptions_start =
1603 parse_checked_exceptions(&checked_exceptions_length,
1604 method_attribute_length,
1605 cp, CHECK_(nullHandle));
1606 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1607 if (method_attribute_length != 0) {
1608 classfile_parse_error(
1609 "Invalid Synthetic method attribute length %u in class file %s",
1610 method_attribute_length, CHECK_(nullHandle));
1611 }
1612 // Should we check that there hasn't already been a synthetic attribute?
1613 access_flags.set_is_synthetic();
1614 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1615 if (method_attribute_length != 0) {
1616 classfile_parse_error(
1617 "Invalid Deprecated method attribute length %u in class file %s",
1618 method_attribute_length, CHECK_(nullHandle));
1619 }
1620 } else if (_major_version >= JAVA_1_5_VERSION) {
1621 if (method_attribute_name == vmSymbols::tag_signature()) {
1622 if (method_attribute_length != 2) {
1623 classfile_parse_error(
1624 "Invalid Signature attribute length %u in class file %s",
1625 method_attribute_length, CHECK_(nullHandle));
1626 }
1627 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1628 generic_signature_index = cfs->get_u2_fast();
1629 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1630 runtime_visible_annotations_length = method_attribute_length;
1631 runtime_visible_annotations = cfs->get_u1_buffer();
1632 assert(runtime_visible_annotations != NULL, "null visible annotations");
1633 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1634 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1635 runtime_invisible_annotations_length = method_attribute_length;
1636 runtime_invisible_annotations = cfs->get_u1_buffer();
1637 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1638 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1639 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1640 runtime_visible_parameter_annotations_length = method_attribute_length;
1641 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1642 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1643 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1644 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1645 runtime_invisible_parameter_annotations_length = method_attribute_length;
1646 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1647 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1648 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1649 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1650 annotation_default_length = method_attribute_length;
1651 annotation_default = cfs->get_u1_buffer();
1652 assert(annotation_default != NULL, "null annotation default");
1653 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1654 } else {
1655 // Skip unknown attributes
1656 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1657 }
1658 } else {
1659 // Skip unknown attributes
1660 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1661 }
1662 }
1664 if (linenumber_table != NULL) {
1665 linenumber_table->write_terminator();
1666 linenumber_table_length = linenumber_table->position();
1667 }
1669 // Make sure there's at least one Code attribute in non-native/non-abstract method
1670 if (_need_verify) {
1671 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1672 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1673 }
1675 // All sizing information for a methodOop is finally available, now create it
1676 methodOop m_oop = oopFactory::new_method(
1677 code_length, access_flags, linenumber_table_length,
1678 total_lvt_length, checked_exceptions_length, CHECK_(nullHandle));
1679 methodHandle m (THREAD, m_oop);
1681 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1683 // Fill in information from fixed part (access_flags already set)
1684 m->set_constants(cp());
1685 m->set_name_index(name_index);
1686 m->set_signature_index(signature_index);
1687 m->set_generic_signature_index(generic_signature_index);
1688 #ifdef CC_INTERP
1689 // hmm is there a gc issue here??
1690 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1691 m->set_result_index(rtf.type());
1692 #endif
1694 if (args_size >= 0) {
1695 m->set_size_of_parameters(args_size);
1696 } else {
1697 m->compute_size_of_parameters(THREAD);
1698 }
1699 #ifdef ASSERT
1700 if (args_size >= 0) {
1701 m->compute_size_of_parameters(THREAD);
1702 assert(args_size == m->size_of_parameters(), "");
1703 }
1704 #endif
1706 // Fill in code attribute information
1707 m->set_max_stack(max_stack);
1708 m->set_max_locals(max_locals);
1709 m->constMethod()->set_stackmap_data(stackmap_data());
1711 /**
1712 * The exception_table field is the flag used to indicate
1713 * that the methodOop and it's associated constMethodOop are partially
1714 * initialized and thus are exempt from pre/post GC verification. Once
1715 * the field is set, the oops are considered fully initialized so make
1716 * sure that the oops can pass verification when this field is set.
1717 */
1718 m->set_exception_table(exception_handlers());
1720 // Copy byte codes
1721 if (code_length > 0) {
1722 memcpy(m->code_base(), code_start, code_length);
1723 }
1725 // Copy line number table
1726 if (linenumber_table != NULL) {
1727 memcpy(m->compressed_linenumber_table(),
1728 linenumber_table->buffer(), linenumber_table_length);
1729 }
1731 // Copy checked exceptions
1732 if (checked_exceptions_length > 0) {
1733 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1734 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1735 }
1737 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1738 *
1739 * Rules for LVT's and LVTT's are:
1740 * - There can be any number of LVT's and LVTT's.
1741 * - If there are n LVT's, it is the same as if there was just
1742 * one LVT containing all the entries from the n LVT's.
1743 * - There may be no more than one LVT entry per local variable.
1744 * Two LVT entries are 'equal' if these fields are the same:
1745 * start_pc, length, name, slot
1746 * - There may be no more than one LVTT entry per each LVT entry.
1747 * Each LVTT entry has to match some LVT entry.
1748 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1749 */
1750 if (total_lvt_length > 0) {
1751 int tbl_no, idx;
1753 promoted_flags->set_has_localvariable_table();
1755 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1756 initialize_hashtable(lvt_Hash);
1758 // To fill LocalVariableTable in
1759 Classfile_LVT_Element* cf_lvt;
1760 LocalVariableTableElement* lvt = m->localvariable_table_start();
1762 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1763 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1764 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1765 copy_lvt_element(&cf_lvt[idx], lvt);
1766 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1767 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1768 && _need_verify
1769 && _major_version >= JAVA_1_5_VERSION ) {
1770 clear_hashtable(lvt_Hash);
1771 classfile_parse_error("Duplicated LocalVariableTable attribute "
1772 "entry for '%s' in class file %s",
1773 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1774 CHECK_(nullHandle));
1775 }
1776 }
1777 }
1779 // To merge LocalVariableTable and LocalVariableTypeTable
1780 Classfile_LVT_Element* cf_lvtt;
1781 LocalVariableTableElement lvtt_elem;
1783 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1784 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1785 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1786 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1787 int index = hash(&lvtt_elem);
1788 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1789 if (entry == NULL) {
1790 if (_need_verify) {
1791 clear_hashtable(lvt_Hash);
1792 classfile_parse_error("LVTT entry for '%s' in class file %s "
1793 "does not match any LVT entry",
1794 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1795 CHECK_(nullHandle));
1796 }
1797 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1798 clear_hashtable(lvt_Hash);
1799 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1800 "entry for '%s' in class file %s",
1801 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1802 CHECK_(nullHandle));
1803 } else {
1804 // to add generic signatures into LocalVariableTable
1805 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1806 }
1807 }
1808 }
1809 clear_hashtable(lvt_Hash);
1810 }
1812 *method_annotations = assemble_annotations(runtime_visible_annotations,
1813 runtime_visible_annotations_length,
1814 runtime_invisible_annotations,
1815 runtime_invisible_annotations_length,
1816 CHECK_(nullHandle));
1817 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1818 runtime_visible_parameter_annotations_length,
1819 runtime_invisible_parameter_annotations,
1820 runtime_invisible_parameter_annotations_length,
1821 CHECK_(nullHandle));
1822 *method_default_annotations = assemble_annotations(annotation_default,
1823 annotation_default_length,
1824 NULL,
1825 0,
1826 CHECK_(nullHandle));
1828 if (name() == vmSymbols::finalize_method_name() &&
1829 signature() == vmSymbols::void_method_signature()) {
1830 if (m->is_empty_method()) {
1831 _has_empty_finalizer = true;
1832 } else {
1833 _has_finalizer = true;
1834 }
1835 }
1836 if (name() == vmSymbols::object_initializer_name() &&
1837 signature() == vmSymbols::void_method_signature() &&
1838 m->is_vanilla_constructor()) {
1839 _has_vanilla_constructor = true;
1840 }
1842 return m;
1843 }
1846 // The promoted_flags parameter is used to pass relevant access_flags
1847 // from the methods back up to the containing klass. These flag values
1848 // are added to klass's access_flags.
1850 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1851 AccessFlags* promoted_flags,
1852 bool* has_final_method,
1853 objArrayOop* methods_annotations_oop,
1854 objArrayOop* methods_parameter_annotations_oop,
1855 objArrayOop* methods_default_annotations_oop,
1856 TRAPS) {
1857 ClassFileStream* cfs = stream();
1858 objArrayHandle nullHandle;
1859 typeArrayHandle method_annotations;
1860 typeArrayHandle method_parameter_annotations;
1861 typeArrayHandle method_default_annotations;
1862 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1863 u2 length = cfs->get_u2_fast();
1864 if (length == 0) {
1865 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1866 } else {
1867 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1868 objArrayHandle methods(THREAD, m);
1869 HandleMark hm(THREAD);
1870 objArrayHandle methods_annotations;
1871 objArrayHandle methods_parameter_annotations;
1872 objArrayHandle methods_default_annotations;
1873 for (int index = 0; index < length; index++) {
1874 methodHandle method = parse_method(cp, is_interface,
1875 promoted_flags,
1876 &method_annotations,
1877 &method_parameter_annotations,
1878 &method_default_annotations,
1879 CHECK_(nullHandle));
1880 if (method->is_final()) {
1881 *has_final_method = true;
1882 }
1883 methods->obj_at_put(index, method());
1884 if (method_annotations.not_null()) {
1885 if (methods_annotations.is_null()) {
1886 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1887 methods_annotations = objArrayHandle(THREAD, md);
1888 }
1889 methods_annotations->obj_at_put(index, method_annotations());
1890 }
1891 if (method_parameter_annotations.not_null()) {
1892 if (methods_parameter_annotations.is_null()) {
1893 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1894 methods_parameter_annotations = objArrayHandle(THREAD, md);
1895 }
1896 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1897 }
1898 if (method_default_annotations.not_null()) {
1899 if (methods_default_annotations.is_null()) {
1900 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1901 methods_default_annotations = objArrayHandle(THREAD, md);
1902 }
1903 methods_default_annotations->obj_at_put(index, method_default_annotations());
1904 }
1905 }
1906 if (_need_verify && length > 1) {
1907 // Check duplicated methods
1908 ResourceMark rm(THREAD);
1909 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1910 THREAD, NameSigHash*, HASH_ROW_SIZE);
1911 initialize_hashtable(names_and_sigs);
1912 bool dup = false;
1913 {
1914 debug_only(No_Safepoint_Verifier nsv;)
1915 for (int i = 0; i < length; i++) {
1916 methodOop m = (methodOop)methods->obj_at(i);
1917 // If no duplicates, add name/signature in hashtable names_and_sigs.
1918 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1919 dup = true;
1920 break;
1921 }
1922 }
1923 }
1924 if (dup) {
1925 classfile_parse_error("Duplicate method name&signature in class file %s",
1926 CHECK_(nullHandle));
1927 }
1928 }
1930 *methods_annotations_oop = methods_annotations();
1931 *methods_parameter_annotations_oop = methods_parameter_annotations();
1932 *methods_default_annotations_oop = methods_default_annotations();
1934 return methods;
1935 }
1936 }
1939 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1940 objArrayHandle methods_annotations,
1941 objArrayHandle methods_parameter_annotations,
1942 objArrayHandle methods_default_annotations,
1943 TRAPS) {
1944 typeArrayHandle nullHandle;
1945 int length = methods()->length();
1946 // If JVMTI original method ordering is enabled we have to
1947 // remember the original class file ordering.
1948 // We temporarily use the vtable_index field in the methodOop to store the
1949 // class file index, so we can read in after calling qsort.
1950 if (JvmtiExport::can_maintain_original_method_order()) {
1951 for (int index = 0; index < length; index++) {
1952 methodOop m = methodOop(methods->obj_at(index));
1953 assert(!m->valid_vtable_index(), "vtable index should not be set");
1954 m->set_vtable_index(index);
1955 }
1956 }
1957 // Sort method array by ascending method name (for faster lookups & vtable construction)
1958 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1959 methodOopDesc::sort_methods(methods(),
1960 methods_annotations(),
1961 methods_parameter_annotations(),
1962 methods_default_annotations());
1964 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1965 if (JvmtiExport::can_maintain_original_method_order()) {
1966 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1967 typeArrayHandle method_ordering(THREAD, new_ordering);
1968 for (int index = 0; index < length; index++) {
1969 methodOop m = methodOop(methods->obj_at(index));
1970 int old_index = m->vtable_index();
1971 assert(old_index >= 0 && old_index < length, "invalid method index");
1972 method_ordering->int_at_put(index, old_index);
1973 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1974 }
1975 return method_ordering;
1976 } else {
1977 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1978 }
1979 }
1982 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1983 ClassFileStream* cfs = stream();
1984 cfs->guarantee_more(2, CHECK); // sourcefile_index
1985 u2 sourcefile_index = cfs->get_u2_fast();
1986 check_property(
1987 valid_cp_range(sourcefile_index, cp->length()) &&
1988 cp->tag_at(sourcefile_index).is_utf8(),
1989 "Invalid SourceFile attribute at constant pool index %u in class file %s",
1990 sourcefile_index, CHECK);
1991 k->set_source_file_name(cp->symbol_at(sourcefile_index));
1992 }
1996 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
1997 instanceKlassHandle k,
1998 int length, TRAPS) {
1999 ClassFileStream* cfs = stream();
2000 u1* sde_buffer = cfs->get_u1_buffer();
2001 assert(sde_buffer != NULL, "null sde buffer");
2003 // Don't bother storing it if there is no way to retrieve it
2004 if (JvmtiExport::can_get_source_debug_extension()) {
2005 // Optimistically assume that only 1 byte UTF format is used
2006 // (common case)
2007 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2008 length, CHECK);
2009 k->set_source_debug_extension(sde_symbol);
2010 }
2011 // Got utf8 string, set stream position forward
2012 cfs->skip_u1(length, CHECK);
2013 }
2016 // Inner classes can be static, private or protected (classic VM does this)
2017 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2019 // Return number of classes in the inner classes attribute table
2020 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2021 ClassFileStream* cfs = stream();
2022 cfs->guarantee_more(2, CHECK_0); // length
2023 u2 length = cfs->get_u2_fast();
2025 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2026 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2027 typeArrayHandle inner_classes(THREAD, ic);
2028 int index = 0;
2029 int cp_size = cp->length();
2030 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2031 for (int n = 0; n < length; n++) {
2032 // Inner class index
2033 u2 inner_class_info_index = cfs->get_u2_fast();
2034 check_property(
2035 inner_class_info_index == 0 ||
2036 (valid_cp_range(inner_class_info_index, cp_size) &&
2037 is_klass_reference(cp, inner_class_info_index)),
2038 "inner_class_info_index %u has bad constant type in class file %s",
2039 inner_class_info_index, CHECK_0);
2040 // Outer class index
2041 u2 outer_class_info_index = cfs->get_u2_fast();
2042 check_property(
2043 outer_class_info_index == 0 ||
2044 (valid_cp_range(outer_class_info_index, cp_size) &&
2045 is_klass_reference(cp, outer_class_info_index)),
2046 "outer_class_info_index %u has bad constant type in class file %s",
2047 outer_class_info_index, CHECK_0);
2048 // Inner class name
2049 u2 inner_name_index = cfs->get_u2_fast();
2050 check_property(
2051 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2052 cp->tag_at(inner_name_index).is_utf8()),
2053 "inner_name_index %u has bad constant type in class file %s",
2054 inner_name_index, CHECK_0);
2055 if (_need_verify) {
2056 guarantee_property(inner_class_info_index != outer_class_info_index,
2057 "Class is both outer and inner class in class file %s", CHECK_0);
2058 }
2059 // Access flags
2060 AccessFlags inner_access_flags;
2061 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2062 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2063 // Set abstract bit for old class files for backward compatibility
2064 flags |= JVM_ACC_ABSTRACT;
2065 }
2066 verify_legal_class_modifiers(flags, CHECK_0);
2067 inner_access_flags.set_flags(flags);
2069 inner_classes->short_at_put(index++, inner_class_info_index);
2070 inner_classes->short_at_put(index++, outer_class_info_index);
2071 inner_classes->short_at_put(index++, inner_name_index);
2072 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2073 }
2075 // 4347400: make sure there's no duplicate entry in the classes array
2076 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2077 for(int i = 0; i < inner_classes->length(); i += 4) {
2078 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2079 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2080 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2081 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2082 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2083 "Duplicate entry in InnerClasses in class file %s",
2084 CHECK_0);
2085 }
2086 }
2087 }
2089 // Update instanceKlass with inner class info.
2090 k->set_inner_classes(inner_classes());
2091 return length;
2092 }
2094 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2095 k->set_is_synthetic();
2096 }
2098 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2099 ClassFileStream* cfs = stream();
2100 u2 signature_index = cfs->get_u2(CHECK);
2101 check_property(
2102 valid_cp_range(signature_index, cp->length()) &&
2103 cp->tag_at(signature_index).is_utf8(),
2104 "Invalid constant pool index %u in Signature attribute in class file %s",
2105 signature_index, CHECK);
2106 k->set_generic_signature(cp->symbol_at(signature_index));
2107 }
2109 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2110 ClassFileStream* cfs = stream();
2111 // Set inner classes attribute to default sentinel
2112 k->set_inner_classes(Universe::the_empty_short_array());
2113 cfs->guarantee_more(2, CHECK); // attributes_count
2114 u2 attributes_count = cfs->get_u2_fast();
2115 bool parsed_sourcefile_attribute = false;
2116 bool parsed_innerclasses_attribute = false;
2117 bool parsed_enclosingmethod_attribute = false;
2118 u1* runtime_visible_annotations = NULL;
2119 int runtime_visible_annotations_length = 0;
2120 u1* runtime_invisible_annotations = NULL;
2121 int runtime_invisible_annotations_length = 0;
2122 // Iterate over attributes
2123 while (attributes_count--) {
2124 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2125 u2 attribute_name_index = cfs->get_u2_fast();
2126 u4 attribute_length = cfs->get_u4_fast();
2127 check_property(
2128 valid_cp_range(attribute_name_index, cp->length()) &&
2129 cp->tag_at(attribute_name_index).is_utf8(),
2130 "Attribute name has bad constant pool index %u in class file %s",
2131 attribute_name_index, CHECK);
2132 symbolOop tag = cp->symbol_at(attribute_name_index);
2133 if (tag == vmSymbols::tag_source_file()) {
2134 // Check for SourceFile tag
2135 if (_need_verify) {
2136 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2137 }
2138 if (parsed_sourcefile_attribute) {
2139 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2140 } else {
2141 parsed_sourcefile_attribute = true;
2142 }
2143 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2144 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2145 // Check for SourceDebugExtension tag
2146 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2147 } else if (tag == vmSymbols::tag_inner_classes()) {
2148 // Check for InnerClasses tag
2149 if (parsed_innerclasses_attribute) {
2150 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2151 } else {
2152 parsed_innerclasses_attribute = true;
2153 }
2154 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2155 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2156 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2157 "Wrong InnerClasses attribute length in class file %s", CHECK);
2158 }
2159 } else if (tag == vmSymbols::tag_synthetic()) {
2160 // Check for Synthetic tag
2161 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2162 if (attribute_length != 0) {
2163 classfile_parse_error(
2164 "Invalid Synthetic classfile attribute length %u in class file %s",
2165 attribute_length, CHECK);
2166 }
2167 parse_classfile_synthetic_attribute(cp, k, CHECK);
2168 } else if (tag == vmSymbols::tag_deprecated()) {
2169 // Check for Deprecatd tag - 4276120
2170 if (attribute_length != 0) {
2171 classfile_parse_error(
2172 "Invalid Deprecated classfile attribute length %u in class file %s",
2173 attribute_length, CHECK);
2174 }
2175 } else if (_major_version >= JAVA_1_5_VERSION) {
2176 if (tag == vmSymbols::tag_signature()) {
2177 if (attribute_length != 2) {
2178 classfile_parse_error(
2179 "Wrong Signature attribute length %u in class file %s",
2180 attribute_length, CHECK);
2181 }
2182 parse_classfile_signature_attribute(cp, k, CHECK);
2183 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2184 runtime_visible_annotations_length = attribute_length;
2185 runtime_visible_annotations = cfs->get_u1_buffer();
2186 assert(runtime_visible_annotations != NULL, "null visible annotations");
2187 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2188 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2189 runtime_invisible_annotations_length = attribute_length;
2190 runtime_invisible_annotations = cfs->get_u1_buffer();
2191 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2192 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2193 } else if (tag == vmSymbols::tag_enclosing_method()) {
2194 if (parsed_enclosingmethod_attribute) {
2195 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2196 } else {
2197 parsed_enclosingmethod_attribute = true;
2198 }
2199 cfs->guarantee_more(4, CHECK); // class_index, method_index
2200 u2 class_index = cfs->get_u2_fast();
2201 u2 method_index = cfs->get_u2_fast();
2202 if (class_index == 0) {
2203 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2204 }
2205 // Validate the constant pool indices and types
2206 if (!cp->is_within_bounds(class_index) ||
2207 !is_klass_reference(cp, class_index)) {
2208 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2209 }
2210 if (method_index != 0 &&
2211 (!cp->is_within_bounds(method_index) ||
2212 !cp->tag_at(method_index).is_name_and_type())) {
2213 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2214 }
2215 k->set_enclosing_method_indices(class_index, method_index);
2216 } else {
2217 // Unknown attribute
2218 cfs->skip_u1(attribute_length, CHECK);
2219 }
2220 } else {
2221 // Unknown attribute
2222 cfs->skip_u1(attribute_length, CHECK);
2223 }
2224 }
2225 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2226 runtime_visible_annotations_length,
2227 runtime_invisible_annotations,
2228 runtime_invisible_annotations_length,
2229 CHECK);
2230 k->set_class_annotations(annotations());
2231 }
2234 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2235 int runtime_visible_annotations_length,
2236 u1* runtime_invisible_annotations,
2237 int runtime_invisible_annotations_length, TRAPS) {
2238 typeArrayHandle annotations;
2239 if (runtime_visible_annotations != NULL ||
2240 runtime_invisible_annotations != NULL) {
2241 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2242 runtime_invisible_annotations_length, CHECK_(annotations));
2243 annotations = typeArrayHandle(THREAD, anno);
2244 if (runtime_visible_annotations != NULL) {
2245 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2246 }
2247 if (runtime_invisible_annotations != NULL) {
2248 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2249 }
2250 }
2251 return annotations;
2252 }
2255 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2256 KlassHandle h_k (THREAD, fd->field_holder());
2257 assert(h_k.not_null() && fd->is_static(), "just checking");
2258 if (fd->has_initial_value()) {
2259 BasicType t = fd->field_type();
2260 switch (t) {
2261 case T_BYTE:
2262 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2263 break;
2264 case T_BOOLEAN:
2265 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2266 break;
2267 case T_CHAR:
2268 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2269 break;
2270 case T_SHORT:
2271 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2272 break;
2273 case T_INT:
2274 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2275 break;
2276 case T_FLOAT:
2277 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2278 break;
2279 case T_DOUBLE:
2280 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2281 break;
2282 case T_LONG:
2283 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2284 break;
2285 case T_OBJECT:
2286 {
2287 #ifdef ASSERT
2288 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2289 assert(fd->signature() == sym, "just checking");
2290 #endif
2291 oop string = fd->string_initial_value(CHECK);
2292 h_k()->obj_field_put(fd->offset(), string);
2293 }
2294 break;
2295 default:
2296 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2297 "Illegal ConstantValue attribute in class file");
2298 }
2299 }
2300 }
2303 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2304 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2305 // This code is for compatibility with earlier jdk's that do not
2306 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2307 // the check for the "discovered" field should issue a warning if
2308 // the field is not found. For 1.6 this code should be issue a
2309 // fatal error if the "discovered" field is not found.
2310 //
2311 // Increment fac.nonstatic_oop_count so that the start of the
2312 // next type of non-static oops leaves room for the fake oop.
2313 // Do not increment next_nonstatic_oop_offset so that the
2314 // fake oop is place after the java.lang.ref.Reference oop
2315 // fields.
2316 //
2317 // Check the fields in java.lang.ref.Reference for the "discovered"
2318 // field. If it is not present, artifically create a field for it.
2319 // This allows this VM to run on early JDK where the field is not
2320 // present.
2322 //
2323 // Increment fac.nonstatic_oop_count so that the start of the
2324 // next type of non-static oops leaves room for the fake oop.
2325 // Do not increment next_nonstatic_oop_offset so that the
2326 // fake oop is place after the java.lang.ref.Reference oop
2327 // fields.
2328 //
2329 // Check the fields in java.lang.ref.Reference for the "discovered"
2330 // field. If it is not present, artifically create a field for it.
2331 // This allows this VM to run on early JDK where the field is not
2332 // present.
2333 int reference_sig_index = 0;
2334 int reference_name_index = 0;
2335 int reference_index = 0;
2336 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2337 const int n = (*fields_ptr)()->length();
2338 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2339 int name_index =
2340 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2341 int sig_index =
2342 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2343 symbolOop f_name = cp->symbol_at(name_index);
2344 symbolOop f_sig = cp->symbol_at(sig_index);
2345 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2346 // Save the index for reference signature for later use.
2347 // The fake discovered field does not entries in the
2348 // constant pool so the index for its signature cannot
2349 // be extracted from the constant pool. It will need
2350 // later, however. It's signature is vmSymbols::reference_signature()
2351 // so same an index for that signature.
2352 reference_sig_index = sig_index;
2353 reference_name_index = name_index;
2354 reference_index = i;
2355 }
2356 if (f_name == vmSymbols::reference_discovered_name() &&
2357 f_sig == vmSymbols::reference_signature()) {
2358 // The values below are fake but will force extra
2359 // non-static oop fields and a corresponding non-static
2360 // oop map block to be allocated.
2361 extra = 0;
2362 break;
2363 }
2364 }
2365 if (extra != 0) {
2366 fac_ptr->nonstatic_oop_count += extra;
2367 // Add the additional entry to "fields" so that the klass
2368 // contains the "discoverd" field and the field will be initialized
2369 // in instances of the object.
2370 int fields_with_fix_length = (*fields_ptr)()->length() +
2371 instanceKlass::next_offset;
2372 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2373 fields_with_fix_length, CHECK);
2374 typeArrayHandle fields_with_fix(THREAD, ff);
2376 // Take everything from the original but the length.
2377 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2378 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2379 }
2381 // Add the fake field at the end.
2382 int i = (*fields_ptr)->length();
2383 // There is no name index for the fake "discovered" field nor
2384 // signature but a signature is needed so that the field will
2385 // be properly initialized. Use one found for
2386 // one of the other reference fields. Be sure the index for the
2387 // name is 0. In fieldDescriptor::initialize() the index of the
2388 // name is checked. That check is by passed for the last nonstatic
2389 // oop field in a java.lang.ref.Reference which is assumed to be
2390 // this artificial "discovered" field. An assertion checks that
2391 // the name index is 0.
2392 assert(reference_index != 0, "Missing signature for reference");
2394 int j;
2395 for (j = 0; j < instanceKlass::next_offset; j++) {
2396 fields_with_fix->ushort_at_put(i + j,
2397 (*fields_ptr)->ushort_at(reference_index +j));
2398 }
2399 // Clear the public access flag and set the private access flag.
2400 short flags;
2401 flags =
2402 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2403 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2404 flags = flags & (~JVM_ACC_PUBLIC);
2405 flags = flags | JVM_ACC_PRIVATE;
2406 AccessFlags access_flags;
2407 access_flags.set_flags(flags);
2408 assert(!access_flags.is_public(), "Failed to clear public flag");
2409 assert(access_flags.is_private(), "Failed to set private flag");
2410 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2411 flags);
2413 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2414 == reference_name_index, "The fake reference name is incorrect");
2415 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2416 == reference_sig_index, "The fake reference signature is incorrect");
2417 // The type of the field is stored in the low_offset entry during
2418 // parsing.
2419 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2420 NONSTATIC_OOP, "The fake reference type is incorrect");
2422 // "fields" is allocated in the permanent generation. Disgard
2423 // it and let it be collected.
2424 (*fields_ptr) = fields_with_fix;
2425 }
2426 return;
2427 }
2430 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2431 FieldAllocationCount *fac_ptr, TRAPS) {
2432 // Add fake fields for java.lang.Class instances
2433 //
2434 // This is not particularly nice. We should consider adding a
2435 // private transient object field at the Java level to
2436 // java.lang.Class. Alternatively we could add a subclass of
2437 // instanceKlass which provides an accessor and size computer for
2438 // this field, but that appears to be more code than this hack.
2439 //
2440 // NOTE that we wedge these in at the beginning rather than the
2441 // end of the object because the Class layout changed between JDK
2442 // 1.3 and JDK 1.4 with the new reflection implementation; some
2443 // nonstatic oop fields were added at the Java level. The offsets
2444 // of these fake fields can't change between these two JDK
2445 // versions because when the offsets are computed at bootstrap
2446 // time we don't know yet which version of the JDK we're running in.
2448 // The values below are fake but will force two non-static oop fields and
2449 // a corresponding non-static oop map block to be allocated.
2450 const int extra = java_lang_Class::number_of_fake_oop_fields;
2451 fac_ptr->nonstatic_oop_count += extra;
2452 }
2455 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2456 // Cause the extra fake fields in java.lang.Class to show up before
2457 // the Java fields for layout compatibility between 1.3 and 1.4
2458 // Incrementing next_nonstatic_oop_offset here advances the
2459 // location where the real java fields are placed.
2460 const int extra = java_lang_Class::number_of_fake_oop_fields;
2461 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2462 }
2465 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2466 Handle class_loader,
2467 Handle protection_domain,
2468 GrowableArray<Handle>* cp_patches,
2469 symbolHandle& parsed_name,
2470 TRAPS) {
2471 // So that JVMTI can cache class file in the state before retransformable agents
2472 // have modified it
2473 unsigned char *cached_class_file_bytes = NULL;
2474 jint cached_class_file_length;
2476 ClassFileStream* cfs = stream();
2477 // Timing
2478 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time());
2480 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2482 if (JvmtiExport::should_post_class_file_load_hook()) {
2483 unsigned char* ptr = cfs->buffer();
2484 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2486 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2487 &ptr, &end_ptr,
2488 &cached_class_file_bytes,
2489 &cached_class_file_length);
2491 if (ptr != cfs->buffer()) {
2492 // JVMTI agent has modified class file data.
2493 // Set new class file stream using JVMTI agent modified
2494 // class file data.
2495 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2496 set_stream(cfs);
2497 }
2498 }
2500 _cp_patches = cp_patches;
2502 instanceKlassHandle nullHandle;
2504 // Figure out whether we can skip format checking (matching classic VM behavior)
2505 _need_verify = Verifier::should_verify_for(class_loader());
2507 // Set the verify flag in stream
2508 cfs->set_verify(_need_verify);
2510 // Save the class file name for easier error message printing.
2511 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2513 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2514 // Magic value
2515 u4 magic = cfs->get_u4_fast();
2516 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2517 "Incompatible magic value %u in class file %s",
2518 magic, CHECK_(nullHandle));
2520 // Version numbers
2521 u2 minor_version = cfs->get_u2_fast();
2522 u2 major_version = cfs->get_u2_fast();
2524 // Check version numbers - we check this even with verifier off
2525 if (!is_supported_version(major_version, minor_version)) {
2526 if (name.is_null()) {
2527 Exceptions::fthrow(
2528 THREAD_AND_LOCATION,
2529 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2530 "Unsupported major.minor version %u.%u",
2531 major_version,
2532 minor_version);
2533 } else {
2534 ResourceMark rm(THREAD);
2535 Exceptions::fthrow(
2536 THREAD_AND_LOCATION,
2537 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2538 "%s : Unsupported major.minor version %u.%u",
2539 name->as_C_string(),
2540 major_version,
2541 minor_version);
2542 }
2543 return nullHandle;
2544 }
2546 _major_version = major_version;
2547 _minor_version = minor_version;
2550 // Check if verification needs to be relaxed for this class file
2551 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2552 _relax_verify = Verifier::relax_verify_for(class_loader());
2554 // Constant pool
2555 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2556 int cp_size = cp->length();
2558 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2560 // Access flags
2561 AccessFlags access_flags;
2562 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2564 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2565 // Set abstract bit for old class files for backward compatibility
2566 flags |= JVM_ACC_ABSTRACT;
2567 }
2568 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2569 access_flags.set_flags(flags);
2571 // This class and superclass
2572 instanceKlassHandle super_klass;
2573 u2 this_class_index = cfs->get_u2_fast();
2574 check_property(
2575 valid_cp_range(this_class_index, cp_size) &&
2576 cp->tag_at(this_class_index).is_unresolved_klass(),
2577 "Invalid this class index %u in constant pool in class file %s",
2578 this_class_index, CHECK_(nullHandle));
2580 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2581 assert(class_name.not_null(), "class_name can't be null");
2583 // It's important to set parsed_name *before* resolving the super class.
2584 // (it's used for cleanup by the caller if parsing fails)
2585 parsed_name = class_name;
2587 // Update _class_name which could be null previously to be class_name
2588 _class_name = class_name;
2590 // Don't need to check whether this class name is legal or not.
2591 // It has been checked when constant pool is parsed.
2592 // However, make sure it is not an array type.
2593 if (_need_verify) {
2594 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2595 "Bad class name in class file %s",
2596 CHECK_(nullHandle));
2597 }
2599 klassOop preserve_this_klass; // for storing result across HandleMark
2601 // release all handles when parsing is done
2602 { HandleMark hm(THREAD);
2604 // Checks if name in class file matches requested name
2605 if (name.not_null() && class_name() != name()) {
2606 ResourceMark rm(THREAD);
2607 Exceptions::fthrow(
2608 THREAD_AND_LOCATION,
2609 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2610 "%s (wrong name: %s)",
2611 name->as_C_string(),
2612 class_name->as_C_string()
2613 );
2614 return nullHandle;
2615 }
2617 if (TraceClassLoadingPreorder) {
2618 tty->print("[Loading %s", name()->as_klass_external_name());
2619 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2620 tty->print_cr("]");
2621 }
2623 u2 super_class_index = cfs->get_u2_fast();
2624 if (super_class_index == 0) {
2625 check_property(class_name() == vmSymbols::java_lang_Object(),
2626 "Invalid superclass index %u in class file %s",
2627 super_class_index,
2628 CHECK_(nullHandle));
2629 } else {
2630 check_property(valid_cp_range(super_class_index, cp_size) &&
2631 is_klass_reference(cp, super_class_index),
2632 "Invalid superclass index %u in class file %s",
2633 super_class_index,
2634 CHECK_(nullHandle));
2635 // The class name should be legal because it is checked when parsing constant pool.
2636 // However, make sure it is not an array type.
2637 bool is_array = false;
2638 if (cp->tag_at(super_class_index).is_klass()) {
2639 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2640 if (_need_verify)
2641 is_array = super_klass->oop_is_array();
2642 } else if (_need_verify) {
2643 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2644 }
2645 if (_need_verify) {
2646 guarantee_property(!is_array,
2647 "Bad superclass name in class file %s", CHECK_(nullHandle));
2648 }
2649 }
2651 // Interfaces
2652 u2 itfs_len = cfs->get_u2_fast();
2653 objArrayHandle local_interfaces;
2654 if (itfs_len == 0) {
2655 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2656 } else {
2657 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle));
2658 }
2660 // Fields (offsets are filled in later)
2661 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2662 objArrayHandle fields_annotations;
2663 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2664 // Methods
2665 bool has_final_method = false;
2666 AccessFlags promoted_flags;
2667 promoted_flags.set_flags(0);
2668 // These need to be oop pointers because they are allocated lazily
2669 // inside parse_methods inside a nested HandleMark
2670 objArrayOop methods_annotations_oop = NULL;
2671 objArrayOop methods_parameter_annotations_oop = NULL;
2672 objArrayOop methods_default_annotations_oop = NULL;
2673 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2674 &promoted_flags,
2675 &has_final_method,
2676 &methods_annotations_oop,
2677 &methods_parameter_annotations_oop,
2678 &methods_default_annotations_oop,
2679 CHECK_(nullHandle));
2681 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2682 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2683 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2685 // We check super class after class file is parsed and format is checked
2686 if (super_class_index > 0 && super_klass.is_null()) {
2687 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2688 if (access_flags.is_interface()) {
2689 // Before attempting to resolve the superclass, check for class format
2690 // errors not checked yet.
2691 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2692 "Interfaces must have java.lang.Object as superclass in class file %s",
2693 CHECK_(nullHandle));
2694 }
2695 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2696 sk,
2697 class_loader,
2698 protection_domain,
2699 true,
2700 CHECK_(nullHandle));
2701 KlassHandle kh (THREAD, k);
2702 super_klass = instanceKlassHandle(THREAD, kh());
2703 if (LinkWellKnownClasses) // my super class is well known to me
2704 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2705 }
2706 if (super_klass.not_null()) {
2707 if (super_klass->is_interface()) {
2708 ResourceMark rm(THREAD);
2709 Exceptions::fthrow(
2710 THREAD_AND_LOCATION,
2711 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2712 "class %s has interface %s as super class",
2713 class_name->as_klass_external_name(),
2714 super_klass->external_name()
2715 );
2716 return nullHandle;
2717 }
2718 // Make sure super class is not final
2719 if (super_klass->is_final()) {
2720 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2721 }
2722 }
2724 // Compute the transitive list of all unique interfaces implemented by this class
2725 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2727 // sort methods
2728 typeArrayHandle method_ordering = sort_methods(methods,
2729 methods_annotations,
2730 methods_parameter_annotations,
2731 methods_default_annotations,
2732 CHECK_(nullHandle));
2734 // promote flags from parse_methods() to the klass' flags
2735 access_flags.add_promoted_flags(promoted_flags.as_int());
2737 // Size of Java vtable (in words)
2738 int vtable_size = 0;
2739 int itable_size = 0;
2740 int num_miranda_methods = 0;
2742 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2743 num_miranda_methods,
2744 super_klass(),
2745 methods(),
2746 access_flags,
2747 class_loader(),
2748 class_name(),
2749 local_interfaces());
2751 // Size of Java itable (in words)
2752 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2754 // Field size and offset computation
2755 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2756 #ifndef PRODUCT
2757 int orig_nonstatic_field_size = 0;
2758 #endif
2759 int static_field_size = 0;
2760 int next_static_oop_offset;
2761 int next_static_double_offset;
2762 int next_static_word_offset;
2763 int next_static_short_offset;
2764 int next_static_byte_offset;
2765 int next_static_type_offset;
2766 int next_nonstatic_oop_offset;
2767 int next_nonstatic_double_offset;
2768 int next_nonstatic_word_offset;
2769 int next_nonstatic_short_offset;
2770 int next_nonstatic_byte_offset;
2771 int next_nonstatic_type_offset;
2772 int first_nonstatic_oop_offset;
2773 int first_nonstatic_field_offset;
2774 int next_nonstatic_field_offset;
2776 // Calculate the starting byte offsets
2777 next_static_oop_offset = (instanceKlass::header_size() +
2778 align_object_offset(vtable_size) +
2779 align_object_offset(itable_size)) * wordSize;
2780 next_static_double_offset = next_static_oop_offset +
2781 (fac.static_oop_count * heapOopSize);
2782 if ( fac.static_double_count &&
2783 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2784 Universe::field_type_should_be_aligned(T_LONG)) ) {
2785 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2786 }
2788 next_static_word_offset = next_static_double_offset +
2789 (fac.static_double_count * BytesPerLong);
2790 next_static_short_offset = next_static_word_offset +
2791 (fac.static_word_count * BytesPerInt);
2792 next_static_byte_offset = next_static_short_offset +
2793 (fac.static_short_count * BytesPerShort);
2794 next_static_type_offset = align_size_up((next_static_byte_offset +
2795 fac.static_byte_count ), wordSize );
2796 static_field_size = (next_static_type_offset -
2797 next_static_oop_offset) / wordSize;
2798 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
2799 nonstatic_field_size * heapOopSize;
2800 next_nonstatic_field_offset = first_nonstatic_field_offset;
2802 // Add fake fields for java.lang.Class instances (also see below)
2803 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2804 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2805 }
2807 // Add a fake "discovered" field if it is not present
2808 // for compatibility with earlier jdk's.
2809 if (class_name() == vmSymbols::java_lang_ref_Reference()
2810 && class_loader.is_null()) {
2811 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2812 }
2813 // end of "discovered" field compactibility fix
2815 int nonstatic_double_count = fac.nonstatic_double_count;
2816 int nonstatic_word_count = fac.nonstatic_word_count;
2817 int nonstatic_short_count = fac.nonstatic_short_count;
2818 int nonstatic_byte_count = fac.nonstatic_byte_count;
2819 int nonstatic_oop_count = fac.nonstatic_oop_count;
2821 bool super_has_nonstatic_fields =
2822 (super_klass() != NULL && super_klass->has_nonstatic_fields());
2823 bool has_nonstatic_fields = super_has_nonstatic_fields ||
2824 ((nonstatic_double_count + nonstatic_word_count +
2825 nonstatic_short_count + nonstatic_byte_count +
2826 nonstatic_oop_count) != 0);
2829 // Prepare list of oops for oop maps generation.
2830 u2* nonstatic_oop_offsets;
2831 u2* nonstatic_oop_length;
2832 int nonstatic_oop_map_count = 0;
2834 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2835 THREAD, u2, nonstatic_oop_count+1);
2836 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2837 THREAD, u2, nonstatic_oop_count+1);
2839 // Add fake fields for java.lang.Class instances (also see above).
2840 // FieldsAllocationStyle and CompactFields values will be reset to default.
2841 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2842 java_lang_Class_fix_post(&next_nonstatic_field_offset);
2843 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset;
2844 int fake_oop_count = (( next_nonstatic_field_offset -
2845 first_nonstatic_field_offset ) / heapOopSize);
2846 nonstatic_oop_length [0] = (u2)fake_oop_count;
2847 nonstatic_oop_map_count = 1;
2848 nonstatic_oop_count -= fake_oop_count;
2849 first_nonstatic_oop_offset = first_nonstatic_field_offset;
2850 } else {
2851 first_nonstatic_oop_offset = 0; // will be set for first oop field
2852 }
2854 #ifndef PRODUCT
2855 if( PrintCompactFieldsSavings ) {
2856 next_nonstatic_double_offset = next_nonstatic_field_offset +
2857 (nonstatic_oop_count * heapOopSize);
2858 if ( nonstatic_double_count > 0 ) {
2859 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2860 }
2861 next_nonstatic_word_offset = next_nonstatic_double_offset +
2862 (nonstatic_double_count * BytesPerLong);
2863 next_nonstatic_short_offset = next_nonstatic_word_offset +
2864 (nonstatic_word_count * BytesPerInt);
2865 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2866 (nonstatic_short_count * BytesPerShort);
2867 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
2868 nonstatic_byte_count ), heapOopSize );
2869 orig_nonstatic_field_size = nonstatic_field_size +
2870 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
2871 }
2872 #endif
2873 bool compact_fields = CompactFields;
2874 int allocation_style = FieldsAllocationStyle;
2875 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range?
2876 assert(false, "0 <= FieldsAllocationStyle <= 1");
2877 allocation_style = 1; // Optimistic
2878 }
2880 // The next classes have predefined hard-coded fields offsets
2881 // (see in JavaClasses::compute_hard_coded_offsets()).
2882 // Use default fields allocation order for them.
2883 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2884 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2885 class_name() == vmSymbols::java_lang_Class() ||
2886 class_name() == vmSymbols::java_lang_ClassLoader() ||
2887 class_name() == vmSymbols::java_lang_ref_Reference() ||
2888 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2889 class_name() == vmSymbols::java_lang_StackTraceElement() ||
2890 class_name() == vmSymbols::java_lang_String() ||
2891 class_name() == vmSymbols::java_lang_Throwable() ||
2892 class_name() == vmSymbols::java_lang_Boolean() ||
2893 class_name() == vmSymbols::java_lang_Character() ||
2894 class_name() == vmSymbols::java_lang_Float() ||
2895 class_name() == vmSymbols::java_lang_Double() ||
2896 class_name() == vmSymbols::java_lang_Byte() ||
2897 class_name() == vmSymbols::java_lang_Short() ||
2898 class_name() == vmSymbols::java_lang_Integer() ||
2899 class_name() == vmSymbols::java_lang_Long())) {
2900 allocation_style = 0; // Allocate oops first
2901 compact_fields = false; // Don't compact fields
2902 }
2904 if( allocation_style == 0 ) {
2905 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2906 next_nonstatic_oop_offset = next_nonstatic_field_offset;
2907 next_nonstatic_double_offset = next_nonstatic_oop_offset +
2908 (nonstatic_oop_count * heapOopSize);
2909 } else if( allocation_style == 1 ) {
2910 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
2911 next_nonstatic_double_offset = next_nonstatic_field_offset;
2912 } else {
2913 ShouldNotReachHere();
2914 }
2916 int nonstatic_oop_space_count = 0;
2917 int nonstatic_word_space_count = 0;
2918 int nonstatic_short_space_count = 0;
2919 int nonstatic_byte_space_count = 0;
2920 int nonstatic_oop_space_offset;
2921 int nonstatic_word_space_offset;
2922 int nonstatic_short_space_offset;
2923 int nonstatic_byte_space_offset;
2925 if( nonstatic_double_count > 0 ) {
2926 int offset = next_nonstatic_double_offset;
2927 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
2928 if( compact_fields && offset != next_nonstatic_double_offset ) {
2929 // Allocate available fields into the gap before double field.
2930 int length = next_nonstatic_double_offset - offset;
2931 assert(length == BytesPerInt, "");
2932 nonstatic_word_space_offset = offset;
2933 if( nonstatic_word_count > 0 ) {
2934 nonstatic_word_count -= 1;
2935 nonstatic_word_space_count = 1; // Only one will fit
2936 length -= BytesPerInt;
2937 offset += BytesPerInt;
2938 }
2939 nonstatic_short_space_offset = offset;
2940 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
2941 nonstatic_short_count -= 1;
2942 nonstatic_short_space_count += 1;
2943 length -= BytesPerShort;
2944 offset += BytesPerShort;
2945 }
2946 nonstatic_byte_space_offset = offset;
2947 while( length > 0 && nonstatic_byte_count > 0 ) {
2948 nonstatic_byte_count -= 1;
2949 nonstatic_byte_space_count += 1;
2950 length -= 1;
2951 }
2952 // Allocate oop field in the gap if there are no other fields for that.
2953 nonstatic_oop_space_offset = offset;
2954 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
2955 allocation_style != 0 ) { // when oop fields not first
2956 nonstatic_oop_count -= 1;
2957 nonstatic_oop_space_count = 1; // Only one will fit
2958 length -= heapOopSize;
2959 offset += heapOopSize;
2960 }
2961 }
2962 }
2964 next_nonstatic_word_offset = next_nonstatic_double_offset +
2965 (nonstatic_double_count * BytesPerLong);
2966 next_nonstatic_short_offset = next_nonstatic_word_offset +
2967 (nonstatic_word_count * BytesPerInt);
2968 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2969 (nonstatic_short_count * BytesPerShort);
2971 int notaligned_offset;
2972 if( allocation_style == 0 ) {
2973 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2974 } else { // allocation_style == 1
2975 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
2976 if( nonstatic_oop_count > 0 ) {
2977 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
2978 }
2979 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
2980 }
2981 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
2982 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
2983 - first_nonstatic_field_offset)/heapOopSize);
2985 // Iterate over fields again and compute correct offsets.
2986 // The field allocation type was temporarily stored in the offset slot.
2987 // oop fields are located before non-oop fields (static and non-static).
2988 int len = fields->length();
2989 for (int i = 0; i < len; i += instanceKlass::next_offset) {
2990 int real_offset;
2991 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4);
2992 switch (atype) {
2993 case STATIC_OOP:
2994 real_offset = next_static_oop_offset;
2995 next_static_oop_offset += heapOopSize;
2996 break;
2997 case STATIC_BYTE:
2998 real_offset = next_static_byte_offset;
2999 next_static_byte_offset += 1;
3000 break;
3001 case STATIC_SHORT:
3002 real_offset = next_static_short_offset;
3003 next_static_short_offset += BytesPerShort;
3004 break;
3005 case STATIC_WORD:
3006 real_offset = next_static_word_offset;
3007 next_static_word_offset += BytesPerInt;
3008 break;
3009 case STATIC_ALIGNED_DOUBLE:
3010 case STATIC_DOUBLE:
3011 real_offset = next_static_double_offset;
3012 next_static_double_offset += BytesPerLong;
3013 break;
3014 case NONSTATIC_OOP:
3015 if( nonstatic_oop_space_count > 0 ) {
3016 real_offset = nonstatic_oop_space_offset;
3017 nonstatic_oop_space_offset += heapOopSize;
3018 nonstatic_oop_space_count -= 1;
3019 } else {
3020 real_offset = next_nonstatic_oop_offset;
3021 next_nonstatic_oop_offset += heapOopSize;
3022 }
3023 // Update oop maps
3024 if( nonstatic_oop_map_count > 0 &&
3025 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3026 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * heapOopSize) ) {
3027 // Extend current oop map
3028 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1;
3029 } else {
3030 // Create new oop map
3031 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset;
3032 nonstatic_oop_length [nonstatic_oop_map_count] = 1;
3033 nonstatic_oop_map_count += 1;
3034 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3035 first_nonstatic_oop_offset = real_offset;
3036 }
3037 }
3038 break;
3039 case NONSTATIC_BYTE:
3040 if( nonstatic_byte_space_count > 0 ) {
3041 real_offset = nonstatic_byte_space_offset;
3042 nonstatic_byte_space_offset += 1;
3043 nonstatic_byte_space_count -= 1;
3044 } else {
3045 real_offset = next_nonstatic_byte_offset;
3046 next_nonstatic_byte_offset += 1;
3047 }
3048 break;
3049 case NONSTATIC_SHORT:
3050 if( nonstatic_short_space_count > 0 ) {
3051 real_offset = nonstatic_short_space_offset;
3052 nonstatic_short_space_offset += BytesPerShort;
3053 nonstatic_short_space_count -= 1;
3054 } else {
3055 real_offset = next_nonstatic_short_offset;
3056 next_nonstatic_short_offset += BytesPerShort;
3057 }
3058 break;
3059 case NONSTATIC_WORD:
3060 if( nonstatic_word_space_count > 0 ) {
3061 real_offset = nonstatic_word_space_offset;
3062 nonstatic_word_space_offset += BytesPerInt;
3063 nonstatic_word_space_count -= 1;
3064 } else {
3065 real_offset = next_nonstatic_word_offset;
3066 next_nonstatic_word_offset += BytesPerInt;
3067 }
3068 break;
3069 case NONSTATIC_ALIGNED_DOUBLE:
3070 case NONSTATIC_DOUBLE:
3071 real_offset = next_nonstatic_double_offset;
3072 next_nonstatic_double_offset += BytesPerLong;
3073 break;
3074 default:
3075 ShouldNotReachHere();
3076 }
3077 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) );
3078 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) );
3079 }
3081 // Size of instances
3082 int instance_size;
3084 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3085 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3087 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3089 // Size of non-static oop map blocks (in words) allocated at end of klass
3090 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset);
3092 // Compute reference type
3093 ReferenceType rt;
3094 if (super_klass() == NULL) {
3095 rt = REF_NONE;
3096 } else {
3097 rt = super_klass->reference_type();
3098 }
3100 // We can now create the basic klassOop for this klass
3101 klassOop ik = oopFactory::new_instanceKlass(
3102 vtable_size, itable_size,
3103 static_field_size, nonstatic_oop_map_size,
3104 rt, CHECK_(nullHandle));
3105 instanceKlassHandle this_klass (THREAD, ik);
3107 assert(this_klass->static_field_size() == static_field_size &&
3108 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check");
3110 // Fill in information already parsed
3111 this_klass->set_access_flags(access_flags);
3112 jint lh = Klass::instance_layout_helper(instance_size, false);
3113 this_klass->set_layout_helper(lh);
3114 assert(this_klass->oop_is_instance(), "layout is correct");
3115 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3116 // Not yet: supers are done below to support the new subtype-checking fields
3117 //this_klass->set_super(super_klass());
3118 this_klass->set_class_loader(class_loader());
3119 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3120 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3121 this_klass->set_static_oop_field_size(fac.static_oop_count);
3122 cp->set_pool_holder(this_klass());
3123 this_klass->set_constants(cp());
3124 this_klass->set_local_interfaces(local_interfaces());
3125 this_klass->set_fields(fields());
3126 this_klass->set_methods(methods());
3127 if (has_final_method) {
3128 this_klass->set_has_final_method();
3129 }
3130 this_klass->set_method_ordering(method_ordering());
3131 this_klass->set_initial_method_idnum(methods->length());
3132 this_klass->set_name(cp->klass_name_at(this_class_index));
3133 if (LinkWellKnownClasses) // I am well known to myself
3134 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3135 this_klass->set_protection_domain(protection_domain());
3136 this_klass->set_fields_annotations(fields_annotations());
3137 this_klass->set_methods_annotations(methods_annotations());
3138 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3139 this_klass->set_methods_default_annotations(methods_default_annotations());
3141 this_klass->set_minor_version(minor_version);
3142 this_klass->set_major_version(major_version);
3144 if (cached_class_file_bytes != NULL) {
3145 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3146 this_klass->set_cached_class_file(cached_class_file_bytes,
3147 cached_class_file_length);
3148 }
3150 // Miranda methods
3151 if ((num_miranda_methods > 0) ||
3152 // if this class introduced new miranda methods or
3153 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3154 // super class exists and this class inherited miranda methods
3155 ) {
3156 this_klass->set_has_miranda_methods(); // then set a flag
3157 }
3159 // Additional attributes
3160 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3162 // Make sure this is the end of class file stream
3163 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3165 // Initialize static fields
3166 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3168 // VerifyOops believes that once this has been set, the object is completely loaded.
3169 // Compute transitive closure of interfaces this class implements
3170 this_klass->set_transitive_interfaces(transitive_interfaces());
3172 // Fill in information needed to compute superclasses.
3173 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3175 // Initialize itable offset tables
3176 klassItable::setup_itable_offset_table(this_klass);
3178 // Do final class setup
3179 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length);
3181 set_precomputed_flags(this_klass);
3183 // reinitialize modifiers, using the InnerClasses attribute
3184 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3185 this_klass->set_modifier_flags(computed_modifiers);
3187 // check if this class can access its super class
3188 check_super_class_access(this_klass, CHECK_(nullHandle));
3190 // check if this class can access its superinterfaces
3191 check_super_interface_access(this_klass, CHECK_(nullHandle));
3193 // check if this class overrides any final method
3194 check_final_method_override(this_klass, CHECK_(nullHandle));
3196 // check that if this class is an interface then it doesn't have static methods
3197 if (this_klass->is_interface()) {
3198 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3199 }
3201 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3202 false /* not shared class */);
3204 if (TraceClassLoading) {
3205 // print in a single call to reduce interleaving of output
3206 if (cfs->source() != NULL) {
3207 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3208 cfs->source());
3209 } else if (class_loader.is_null()) {
3210 if (THREAD->is_Java_thread()) {
3211 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3212 tty->print("[Loaded %s by instance of %s]\n",
3213 this_klass->external_name(),
3214 instanceKlass::cast(caller)->external_name());
3215 } else {
3216 tty->print("[Loaded %s]\n", this_klass->external_name());
3217 }
3218 } else {
3219 ResourceMark rm;
3220 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3221 instanceKlass::cast(class_loader->klass())->external_name());
3222 }
3223 }
3225 if (TraceClassResolution) {
3226 // print out the superclass.
3227 const char * from = Klass::cast(this_klass())->external_name();
3228 if (this_klass->java_super() != NULL) {
3229 tty->print("RESOLVE %s %s\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3230 }
3231 // print out each of the interface classes referred to by this class.
3232 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3233 if (!local_interfaces.is_null()) {
3234 int length = local_interfaces->length();
3235 for (int i = 0; i < length; i++) {
3236 klassOop k = klassOop(local_interfaces->obj_at(i));
3237 instanceKlass* to_class = instanceKlass::cast(k);
3238 const char * to = to_class->external_name();
3239 tty->print("RESOLVE %s %s\n", from, to);
3240 }
3241 }
3242 }
3244 #ifndef PRODUCT
3245 if( PrintCompactFieldsSavings ) {
3246 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3247 tty->print("[Saved %d of %d bytes in %s]\n",
3248 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3249 orig_nonstatic_field_size*heapOopSize,
3250 this_klass->external_name());
3251 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3252 tty->print("[Wasted %d over %d bytes in %s]\n",
3253 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3254 orig_nonstatic_field_size*heapOopSize,
3255 this_klass->external_name());
3256 }
3257 }
3258 #endif
3260 // preserve result across HandleMark
3261 preserve_this_klass = this_klass();
3262 }
3264 // Create new handle outside HandleMark
3265 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3266 debug_only(this_klass->as_klassOop()->verify();)
3268 return this_klass;
3269 }
3272 int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) {
3273 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size();
3274 if (nonstatic_oop_map_count > 0) {
3275 // We have oops to add to map
3276 if (map_size == 0) {
3277 map_size = nonstatic_oop_map_count;
3278 } else {
3279 // Check whether we should add a new map block or whether the last one can be extended
3280 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps();
3281 OopMapBlock* last_map = first_map + map_size - 1;
3283 int next_offset = last_map->offset() + (last_map->length() * heapOopSize);
3284 if (next_offset == first_nonstatic_oop_offset) {
3285 // There is no gap bettwen superklass's last oop field and first
3286 // local oop field, merge maps.
3287 nonstatic_oop_map_count -= 1;
3288 } else {
3289 // Superklass didn't end with a oop field, add extra maps
3290 assert(next_offset<first_nonstatic_oop_offset, "just checking");
3291 }
3292 map_size += nonstatic_oop_map_count;
3293 }
3294 }
3295 return map_size;
3296 }
3299 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3300 int nonstatic_oop_map_count,
3301 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) {
3302 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3303 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size();
3304 instanceKlass* super = k->superklass();
3305 if (super != NULL) {
3306 int super_oop_map_size = super->nonstatic_oop_map_size();
3307 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3308 // Copy maps from superklass
3309 while (super_oop_map_size-- > 0) {
3310 *this_oop_map++ = *super_oop_map++;
3311 }
3312 }
3313 if (nonstatic_oop_map_count > 0) {
3314 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) {
3315 // Calculated in compute_oop_map_size() number of oop maps is less then
3316 // collected oop maps since there is no gap between superklass's last oop
3317 // field and first local oop field. Extend the last oop map copied
3318 // from the superklass instead of creating new one.
3319 nonstatic_oop_map_count--;
3320 nonstatic_oop_offsets++;
3321 this_oop_map--;
3322 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++);
3323 this_oop_map++;
3324 }
3325 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking");
3326 // Add new map blocks, fill them
3327 while (nonstatic_oop_map_count-- > 0) {
3328 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3329 this_oop_map->set_length(*nonstatic_oop_length++);
3330 this_oop_map++;
3331 }
3332 }
3333 }
3336 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3337 klassOop super = k->super();
3339 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3340 // in which case we don't have to register objects as finalizable
3341 if (!_has_empty_finalizer) {
3342 if (_has_finalizer ||
3343 (super != NULL && super->klass_part()->has_finalizer())) {
3344 k->set_has_finalizer();
3345 }
3346 }
3348 #ifdef ASSERT
3349 bool f = false;
3350 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3351 vmSymbols::void_method_signature());
3352 if (m != NULL && !m->is_empty_method()) {
3353 f = true;
3354 }
3355 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3356 #endif
3358 // Check if this klass supports the java.lang.Cloneable interface
3359 if (SystemDictionary::cloneable_klass_loaded()) {
3360 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) {
3361 k->set_is_cloneable();
3362 }
3363 }
3365 // Check if this klass has a vanilla default constructor
3366 if (super == NULL) {
3367 // java.lang.Object has empty default constructor
3368 k->set_has_vanilla_constructor();
3369 } else {
3370 if (Klass::cast(super)->has_vanilla_constructor() &&
3371 _has_vanilla_constructor) {
3372 k->set_has_vanilla_constructor();
3373 }
3374 #ifdef ASSERT
3375 bool v = false;
3376 if (Klass::cast(super)->has_vanilla_constructor()) {
3377 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3378 ), vmSymbols::void_method_signature());
3379 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3380 v = true;
3381 }
3382 }
3383 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3384 #endif
3385 }
3387 // If it cannot be fast-path allocated, set a bit in the layout helper.
3388 // See documentation of instanceKlass::can_be_fastpath_allocated().
3389 assert(k->size_helper() > 0, "layout_helper is initialized");
3390 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3391 || k->is_abstract() || k->is_interface()
3392 || (k->name() == vmSymbols::java_lang_Class()
3393 && k->class_loader() == NULL)
3394 || k->size_helper() >= FastAllocateSizeLimit) {
3395 // Forbid fast-path allocation.
3396 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3397 k->set_layout_helper(lh);
3398 }
3399 }
3402 // utility method for appending and array with check for duplicates
3404 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3405 // iterate over new interfaces
3406 for (int i = 0; i < ifs->length(); i++) {
3407 oop e = ifs->obj_at(i);
3408 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3409 // check for duplicates
3410 bool duplicate = false;
3411 for (int j = 0; j < index; j++) {
3412 if (result->obj_at(j) == e) {
3413 duplicate = true;
3414 break;
3415 }
3416 }
3417 // add new interface
3418 if (!duplicate) {
3419 result->obj_at_put(index++, e);
3420 }
3421 }
3422 }
3424 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3425 // Compute maximum size for transitive interfaces
3426 int max_transitive_size = 0;
3427 int super_size = 0;
3428 // Add superclass transitive interfaces size
3429 if (super.not_null()) {
3430 super_size = super->transitive_interfaces()->length();
3431 max_transitive_size += super_size;
3432 }
3433 // Add local interfaces' super interfaces
3434 int local_size = local_ifs->length();
3435 for (int i = 0; i < local_size; i++) {
3436 klassOop l = klassOop(local_ifs->obj_at(i));
3437 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3438 }
3439 // Finally add local interfaces
3440 max_transitive_size += local_size;
3441 // Construct array
3442 objArrayHandle result;
3443 if (max_transitive_size == 0) {
3444 // no interfaces, use canonicalized array
3445 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3446 } else if (max_transitive_size == super_size) {
3447 // no new local interfaces added, share superklass' transitive interface array
3448 result = objArrayHandle(THREAD, super->transitive_interfaces());
3449 } else if (max_transitive_size == local_size) {
3450 // only local interfaces added, share local interface array
3451 result = local_ifs;
3452 } else {
3453 objArrayHandle nullHandle;
3454 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3455 result = objArrayHandle(THREAD, new_objarray);
3456 int index = 0;
3457 // Copy down from superclass
3458 if (super.not_null()) {
3459 append_interfaces(result, index, super->transitive_interfaces());
3460 }
3461 // Copy down from local interfaces' superinterfaces
3462 for (int i = 0; i < local_ifs->length(); i++) {
3463 klassOop l = klassOop(local_ifs->obj_at(i));
3464 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3465 }
3466 // Finally add local interfaces
3467 append_interfaces(result, index, local_ifs());
3469 // Check if duplicates were removed
3470 if (index != max_transitive_size) {
3471 assert(index < max_transitive_size, "just checking");
3472 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3473 for (int i = 0; i < index; i++) {
3474 oop e = result->obj_at(i);
3475 assert(e != NULL, "just checking");
3476 new_result->obj_at_put(i, e);
3477 }
3478 result = objArrayHandle(THREAD, new_result);
3479 }
3480 }
3481 return result;
3482 }
3485 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3486 klassOop super = this_klass->super();
3487 if ((super != NULL) &&
3488 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3489 ResourceMark rm(THREAD);
3490 Exceptions::fthrow(
3491 THREAD_AND_LOCATION,
3492 vmSymbolHandles::java_lang_IllegalAccessError(),
3493 "class %s cannot access its superclass %s",
3494 this_klass->external_name(),
3495 instanceKlass::cast(super)->external_name()
3496 );
3497 return;
3498 }
3499 }
3502 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3503 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3504 int lng = local_interfaces->length();
3505 for (int i = lng - 1; i >= 0; i--) {
3506 klassOop k = klassOop(local_interfaces->obj_at(i));
3507 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3508 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3509 ResourceMark rm(THREAD);
3510 Exceptions::fthrow(
3511 THREAD_AND_LOCATION,
3512 vmSymbolHandles::java_lang_IllegalAccessError(),
3513 "class %s cannot access its superinterface %s",
3514 this_klass->external_name(),
3515 instanceKlass::cast(k)->external_name()
3516 );
3517 return;
3518 }
3519 }
3520 }
3523 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3524 objArrayHandle methods (THREAD, this_klass->methods());
3525 int num_methods = methods->length();
3527 // go thru each method and check if it overrides a final method
3528 for (int index = 0; index < num_methods; index++) {
3529 methodOop m = (methodOop)methods->obj_at(index);
3531 // skip private, static and <init> methods
3532 if ((!m->is_private()) &&
3533 (!m->is_static()) &&
3534 (m->name() != vmSymbols::object_initializer_name())) {
3536 symbolOop name = m->name();
3537 symbolOop signature = m->signature();
3538 klassOop k = this_klass->super();
3539 methodOop super_m = NULL;
3540 while (k != NULL) {
3541 // skip supers that don't have final methods.
3542 if (k->klass_part()->has_final_method()) {
3543 // lookup a matching method in the super class hierarchy
3544 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3545 if (super_m == NULL) {
3546 break; // didn't find any match; get out
3547 }
3549 if (super_m->is_final() &&
3550 // matching method in super is final
3551 (Reflection::verify_field_access(this_klass->as_klassOop(),
3552 super_m->method_holder(),
3553 super_m->method_holder(),
3554 super_m->access_flags(), false))
3555 // this class can access super final method and therefore override
3556 ) {
3557 ResourceMark rm(THREAD);
3558 Exceptions::fthrow(
3559 THREAD_AND_LOCATION,
3560 vmSymbolHandles::java_lang_VerifyError(),
3561 "class %s overrides final method %s.%s",
3562 this_klass->external_name(),
3563 name->as_C_string(),
3564 signature->as_C_string()
3565 );
3566 return;
3567 }
3569 // continue to look from super_m's holder's super.
3570 k = instanceKlass::cast(super_m->method_holder())->super();
3571 continue;
3572 }
3574 k = k->klass_part()->super();
3575 }
3576 }
3577 }
3578 }
3581 // assumes that this_klass is an interface
3582 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3583 assert(this_klass->is_interface(), "not an interface");
3584 objArrayHandle methods (THREAD, this_klass->methods());
3585 int num_methods = methods->length();
3587 for (int index = 0; index < num_methods; index++) {
3588 methodOop m = (methodOop)methods->obj_at(index);
3589 // if m is static and not the init method, throw a verify error
3590 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3591 ResourceMark rm(THREAD);
3592 Exceptions::fthrow(
3593 THREAD_AND_LOCATION,
3594 vmSymbolHandles::java_lang_VerifyError(),
3595 "Illegal static method %s in interface %s",
3596 m->name()->as_C_string(),
3597 this_klass->external_name()
3598 );
3599 return;
3600 }
3601 }
3602 }
3604 // utility methods for format checking
3606 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3607 if (!_need_verify) { return; }
3609 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3610 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3611 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3612 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3613 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3614 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3615 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3617 if ((is_abstract && is_final) ||
3618 (is_interface && !is_abstract) ||
3619 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3620 (!is_interface && major_gte_15 && is_annotation)) {
3621 ResourceMark rm(THREAD);
3622 Exceptions::fthrow(
3623 THREAD_AND_LOCATION,
3624 vmSymbolHandles::java_lang_ClassFormatError(),
3625 "Illegal class modifiers in class %s: 0x%X",
3626 _class_name->as_C_string(), flags
3627 );
3628 return;
3629 }
3630 }
3632 bool ClassFileParser::has_illegal_visibility(jint flags) {
3633 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3634 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3635 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3637 return ((is_public && is_protected) ||
3638 (is_public && is_private) ||
3639 (is_protected && is_private));
3640 }
3642 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3643 u2 max_version = JDK_Version::is_gte_jdk17x_version() ?
3644 JAVA_MAX_SUPPORTED_VERSION : JAVA_6_VERSION;
3645 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3646 (major <= max_version) &&
3647 ((major != max_version) ||
3648 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3649 }
3651 void ClassFileParser::verify_legal_field_modifiers(
3652 jint flags, bool is_interface, TRAPS) {
3653 if (!_need_verify) { return; }
3655 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3656 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3657 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3658 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3659 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3660 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3661 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3662 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3663 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3665 bool is_illegal = false;
3667 if (is_interface) {
3668 if (!is_public || !is_static || !is_final || is_private ||
3669 is_protected || is_volatile || is_transient ||
3670 (major_gte_15 && is_enum)) {
3671 is_illegal = true;
3672 }
3673 } else { // not interface
3674 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3675 is_illegal = true;
3676 }
3677 }
3679 if (is_illegal) {
3680 ResourceMark rm(THREAD);
3681 Exceptions::fthrow(
3682 THREAD_AND_LOCATION,
3683 vmSymbolHandles::java_lang_ClassFormatError(),
3684 "Illegal field modifiers in class %s: 0x%X",
3685 _class_name->as_C_string(), flags);
3686 return;
3687 }
3688 }
3690 void ClassFileParser::verify_legal_method_modifiers(
3691 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3692 if (!_need_verify) { return; }
3694 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3695 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3696 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3697 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3698 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3699 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3700 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3701 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3702 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3703 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3704 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3706 bool is_illegal = false;
3708 if (is_interface) {
3709 if (!is_abstract || !is_public || is_static || is_final ||
3710 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3711 is_illegal = true;
3712 }
3713 } else { // not interface
3714 if (is_initializer) {
3715 if (is_static || is_final || is_synchronized || is_native ||
3716 is_abstract || (major_gte_15 && is_bridge)) {
3717 is_illegal = true;
3718 }
3719 } else { // not initializer
3720 if (is_abstract) {
3721 if ((is_final || is_native || is_private || is_static ||
3722 (major_gte_15 && (is_synchronized || is_strict)))) {
3723 is_illegal = true;
3724 }
3725 }
3726 if (has_illegal_visibility(flags)) {
3727 is_illegal = true;
3728 }
3729 }
3730 }
3732 if (is_illegal) {
3733 ResourceMark rm(THREAD);
3734 Exceptions::fthrow(
3735 THREAD_AND_LOCATION,
3736 vmSymbolHandles::java_lang_ClassFormatError(),
3737 "Method %s in class %s has illegal modifiers: 0x%X",
3738 name->as_C_string(), _class_name->as_C_string(), flags);
3739 return;
3740 }
3741 }
3743 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3744 assert(_need_verify, "only called when _need_verify is true");
3745 int i = 0;
3746 int count = length >> 2;
3747 for (int k=0; k<count; k++) {
3748 unsigned char b0 = buffer[i];
3749 unsigned char b1 = buffer[i+1];
3750 unsigned char b2 = buffer[i+2];
3751 unsigned char b3 = buffer[i+3];
3752 // For an unsigned char v,
3753 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3754 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3755 unsigned char res = b0 | b0 - 1 |
3756 b1 | b1 - 1 |
3757 b2 | b2 - 1 |
3758 b3 | b3 - 1;
3759 if (res >= 128) break;
3760 i += 4;
3761 }
3762 for(; i < length; i++) {
3763 unsigned short c;
3764 // no embedded zeros
3765 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3766 if(buffer[i] < 128) {
3767 continue;
3768 }
3769 if ((i + 5) < length) { // see if it's legal supplementary character
3770 if (UTF8::is_supplementary_character(&buffer[i])) {
3771 c = UTF8::get_supplementary_character(&buffer[i]);
3772 i += 5;
3773 continue;
3774 }
3775 }
3776 switch (buffer[i] >> 4) {
3777 default: break;
3778 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3779 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3780 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
3781 c = (buffer[i] & 0x1F) << 6;
3782 i++;
3783 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3784 c += buffer[i] & 0x3F;
3785 if (_major_version <= 47 || c == 0 || c >= 0x80) {
3786 // for classes with major > 47, c must a null or a character in its shortest form
3787 break;
3788 }
3789 }
3790 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3791 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
3792 c = (buffer[i] & 0xF) << 12;
3793 i += 2;
3794 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3795 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3796 if (_major_version <= 47 || c >= 0x800) {
3797 // for classes with major > 47, c must be in its shortest form
3798 break;
3799 }
3800 }
3801 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3802 } // end of switch
3803 } // end of for
3804 }
3806 // Checks if name is a legal class name.
3807 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3808 if (!_need_verify || _relax_verify) { return; }
3810 char buf[fixed_buffer_size];
3811 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3812 unsigned int length = name->utf8_length();
3813 bool legal = false;
3815 if (length > 0) {
3816 char* p;
3817 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3818 p = skip_over_field_signature(bytes, false, length, CHECK);
3819 legal = (p != NULL) && ((p - bytes) == (int)length);
3820 } else if (_major_version < JAVA_1_5_VERSION) {
3821 if (bytes[0] != '<') {
3822 p = skip_over_field_name(bytes, true, length);
3823 legal = (p != NULL) && ((p - bytes) == (int)length);
3824 }
3825 } else {
3826 // 4900761: relax the constraints based on JSR202 spec
3827 // Class names may be drawn from the entire Unicode character set.
3828 // Identifiers between '/' must be unqualified names.
3829 // The utf8 string has been verified when parsing cpool entries.
3830 legal = verify_unqualified_name(bytes, length, LegalClass);
3831 }
3832 }
3833 if (!legal) {
3834 ResourceMark rm(THREAD);
3835 Exceptions::fthrow(
3836 THREAD_AND_LOCATION,
3837 vmSymbolHandles::java_lang_ClassFormatError(),
3838 "Illegal class name \"%s\" in class file %s", bytes,
3839 _class_name->as_C_string()
3840 );
3841 return;
3842 }
3843 }
3845 // Checks if name is a legal field name.
3846 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3847 if (!_need_verify || _relax_verify) { return; }
3849 char buf[fixed_buffer_size];
3850 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3851 unsigned int length = name->utf8_length();
3852 bool legal = false;
3854 if (length > 0) {
3855 if (_major_version < JAVA_1_5_VERSION) {
3856 if (bytes[0] != '<') {
3857 char* p = skip_over_field_name(bytes, false, length);
3858 legal = (p != NULL) && ((p - bytes) == (int)length);
3859 }
3860 } else {
3861 // 4881221: relax the constraints based on JSR202 spec
3862 legal = verify_unqualified_name(bytes, length, LegalField);
3863 }
3864 }
3866 if (!legal) {
3867 ResourceMark rm(THREAD);
3868 Exceptions::fthrow(
3869 THREAD_AND_LOCATION,
3870 vmSymbolHandles::java_lang_ClassFormatError(),
3871 "Illegal field name \"%s\" in class %s", bytes,
3872 _class_name->as_C_string()
3873 );
3874 return;
3875 }
3876 }
3878 // Checks if name is a legal method name.
3879 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
3880 if (!_need_verify || _relax_verify) { return; }
3882 assert(!name.is_null(), "method name is null");
3883 char buf[fixed_buffer_size];
3884 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3885 unsigned int length = name->utf8_length();
3886 bool legal = false;
3888 if (length > 0) {
3889 if (bytes[0] == '<') {
3890 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
3891 legal = true;
3892 }
3893 } else if (_major_version < JAVA_1_5_VERSION) {
3894 char* p;
3895 p = skip_over_field_name(bytes, false, length);
3896 legal = (p != NULL) && ((p - bytes) == (int)length);
3897 } else {
3898 // 4881221: relax the constraints based on JSR202 spec
3899 legal = verify_unqualified_name(bytes, length, LegalMethod);
3900 }
3901 }
3903 if (!legal) {
3904 ResourceMark rm(THREAD);
3905 Exceptions::fthrow(
3906 THREAD_AND_LOCATION,
3907 vmSymbolHandles::java_lang_ClassFormatError(),
3908 "Illegal method name \"%s\" in class %s", bytes,
3909 _class_name->as_C_string()
3910 );
3911 return;
3912 }
3913 }
3916 // Checks if signature is a legal field signature.
3917 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3918 if (!_need_verify) { return; }
3920 char buf[fixed_buffer_size];
3921 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3922 unsigned int length = signature->utf8_length();
3923 char* p = skip_over_field_signature(bytes, false, length, CHECK);
3925 if (p == NULL || (p - bytes) != (int)length) {
3926 ResourceMark rm(THREAD);
3927 Exceptions::fthrow(
3928 THREAD_AND_LOCATION,
3929 vmSymbolHandles::java_lang_ClassFormatError(),
3930 "Field \"%s\" in class %s has illegal signature \"%s\"",
3931 name->as_C_string(), _class_name->as_C_string(), bytes
3932 );
3933 return;
3934 }
3935 }
3937 // Checks if signature is a legal method signature.
3938 // Returns number of parameters
3939 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
3940 if (!_need_verify) {
3941 // make sure caller's args_size will be less than 0 even for non-static
3942 // method so it will be recomputed in compute_size_of_parameters().
3943 return -2;
3944 }
3946 unsigned int args_size = 0;
3947 char buf[fixed_buffer_size];
3948 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3949 unsigned int length = signature->utf8_length();
3950 char* nextp;
3952 // The first character must be a '('
3953 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
3954 length--;
3955 // Skip over legal field signatures
3956 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3957 while ((length > 0) && (nextp != NULL)) {
3958 args_size++;
3959 if (p[0] == 'J' || p[0] == 'D') {
3960 args_size++;
3961 }
3962 length -= nextp - p;
3963 p = nextp;
3964 nextp = skip_over_field_signature(p, false, length, CHECK_0);
3965 }
3966 // The first non-signature thing better be a ')'
3967 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
3968 length--;
3969 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
3970 // All internal methods must return void
3971 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
3972 return args_size;
3973 }
3974 } else {
3975 // Now we better just have a return value
3976 nextp = skip_over_field_signature(p, true, length, CHECK_0);
3977 if (nextp && ((int)length == (nextp - p))) {
3978 return args_size;
3979 }
3980 }
3981 }
3982 }
3983 // Report error
3984 ResourceMark rm(THREAD);
3985 Exceptions::fthrow(
3986 THREAD_AND_LOCATION,
3987 vmSymbolHandles::java_lang_ClassFormatError(),
3988 "Method \"%s\" in class %s has illegal signature \"%s\"",
3989 name->as_C_string(), _class_name->as_C_string(), p
3990 );
3991 return 0;
3992 }
3995 // Unqualified names may not contain the characters '.', ';', or '/'.
3996 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
3997 // Note that method names may not be <init> or <clinit> in this method.
3998 // Because these names have been checked as special cases before calling this method
3999 // in verify_legal_method_name.
4000 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
4001 jchar ch;
4003 for (char* p = name; p != name + length; ) {
4004 ch = *p;
4005 if (ch < 128) {
4006 p++;
4007 if (ch == '.' || ch == ';') {
4008 return false; // do not permit '.' or ';'
4009 }
4010 if (type != LegalClass && ch == '/') {
4011 return false; // do not permit '/' unless it's class name
4012 }
4013 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4014 return false; // do not permit '<' or '>' in method names
4015 }
4016 } else {
4017 char* tmp_p = UTF8::next(p, &ch);
4018 p = tmp_p;
4019 }
4020 }
4021 return true;
4022 }
4025 // Take pointer to a string. Skip over the longest part of the string that could
4026 // be taken as a fieldname. Allow '/' if slash_ok is true.
4027 // Return a pointer to just past the fieldname.
4028 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4029 // being true, we saw consecutive slashes (meaning we were looking for a
4030 // qualified path but found something that was badly-formed).
4031 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4032 char* p;
4033 jchar ch;
4034 jboolean last_is_slash = false;
4035 jboolean not_first_ch = false;
4037 for (p = name; p != name + length; not_first_ch = true) {
4038 char* old_p = p;
4039 ch = *p;
4040 if (ch < 128) {
4041 p++;
4042 // quick check for ascii
4043 if ((ch >= 'a' && ch <= 'z') ||
4044 (ch >= 'A' && ch <= 'Z') ||
4045 (ch == '_' || ch == '$') ||
4046 (not_first_ch && ch >= '0' && ch <= '9')) {
4047 last_is_slash = false;
4048 continue;
4049 }
4050 if (slash_ok && ch == '/') {
4051 if (last_is_slash) {
4052 return NULL; // Don't permit consecutive slashes
4053 }
4054 last_is_slash = true;
4055 continue;
4056 }
4057 } else {
4058 jint unicode_ch;
4059 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4060 p = tmp_p;
4061 last_is_slash = false;
4062 // Check if ch is Java identifier start or is Java identifier part
4063 // 4672820: call java.lang.Character methods directly without generating separate tables.
4064 EXCEPTION_MARK;
4065 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass());
4067 // return value
4068 JavaValue result(T_BOOLEAN);
4069 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4070 JavaCallArguments args;
4071 args.push_int(unicode_ch);
4073 // public static boolean isJavaIdentifierStart(char ch);
4074 JavaCalls::call_static(&result,
4075 klass,
4076 vmSymbolHandles::isJavaIdentifierStart_name(),
4077 vmSymbolHandles::int_bool_signature(),
4078 &args,
4079 THREAD);
4081 if (HAS_PENDING_EXCEPTION) {
4082 CLEAR_PENDING_EXCEPTION;
4083 return 0;
4084 }
4085 if (result.get_jboolean()) {
4086 continue;
4087 }
4089 if (not_first_ch) {
4090 // public static boolean isJavaIdentifierPart(char ch);
4091 JavaCalls::call_static(&result,
4092 klass,
4093 vmSymbolHandles::isJavaIdentifierPart_name(),
4094 vmSymbolHandles::int_bool_signature(),
4095 &args,
4096 THREAD);
4098 if (HAS_PENDING_EXCEPTION) {
4099 CLEAR_PENDING_EXCEPTION;
4100 return 0;
4101 }
4103 if (result.get_jboolean()) {
4104 continue;
4105 }
4106 }
4107 }
4108 return (not_first_ch) ? old_p : NULL;
4109 }
4110 return (not_first_ch) ? p : NULL;
4111 }
4114 // Take pointer to a string. Skip over the longest part of the string that could
4115 // be taken as a field signature. Allow "void" if void_ok.
4116 // Return a pointer to just past the signature.
4117 // Return NULL if no legal signature is found.
4118 char* ClassFileParser::skip_over_field_signature(char* signature,
4119 bool void_ok,
4120 unsigned int length,
4121 TRAPS) {
4122 unsigned int array_dim = 0;
4123 while (length > 0) {
4124 switch (signature[0]) {
4125 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4126 case JVM_SIGNATURE_BOOLEAN:
4127 case JVM_SIGNATURE_BYTE:
4128 case JVM_SIGNATURE_CHAR:
4129 case JVM_SIGNATURE_SHORT:
4130 case JVM_SIGNATURE_INT:
4131 case JVM_SIGNATURE_FLOAT:
4132 case JVM_SIGNATURE_LONG:
4133 case JVM_SIGNATURE_DOUBLE:
4134 return signature + 1;
4135 case JVM_SIGNATURE_CLASS: {
4136 if (_major_version < JAVA_1_5_VERSION) {
4137 // Skip over the class name if one is there
4138 char* p = skip_over_field_name(signature + 1, true, --length);
4140 // The next character better be a semicolon
4141 if (p && (p - signature) > 1 && p[0] == ';') {
4142 return p + 1;
4143 }
4144 } else {
4145 // 4900761: For class version > 48, any unicode is allowed in class name.
4146 length--;
4147 signature++;
4148 while (length > 0 && signature[0] != ';') {
4149 if (signature[0] == '.') {
4150 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4151 }
4152 length--;
4153 signature++;
4154 }
4155 if (signature[0] == ';') { return signature + 1; }
4156 }
4158 return NULL;
4159 }
4160 case JVM_SIGNATURE_ARRAY:
4161 array_dim++;
4162 if (array_dim > 255) {
4163 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4164 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4165 }
4166 // The rest of what's there better be a legal signature
4167 signature++;
4168 length--;
4169 void_ok = false;
4170 break;
4172 default:
4173 return NULL;
4174 }
4175 }
4176 return NULL;
4177 }
