Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/classfile/classFileParser.cpp@e5b0439ef4ae
src/share/vm/classfile/classFileParser.cpp
Wed, 08 Apr 2009 10:56:49 -0700
- author
- jrose
- date
- Wed, 08 Apr 2009 10:56:49 -0700
- changeset 1145
- e5b0439ef4ae
- parent 1092
- 715dceaa89b7
- child 1291
- 75596850f863
- child 1310
- 6a93908f268f
- permissions
- -rw-r--r--
6655638: dynamic languages need method handles
Summary: initial implementation, with known omissions (x86/64, sparc, compiler optim., c-oops, C++ interp.)
Reviewed-by: kvn, twisti, never
1 /*
2 * Copyright 1997-2009 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,
236 methodOopDesc::IsSafeConc,
237 CHECK_(nullHandle));
238 constantPoolHandle cp (THREAD, constant_pool);
240 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
242 // parsing constant pool entries
243 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
245 int index = 1; // declared outside of loops for portability
247 // first verification pass - validate cross references and fixup class and string constants
248 for (index = 1; index < length; index++) { // Index 0 is unused
249 switch (cp->tag_at(index).value()) {
250 case JVM_CONSTANT_Class :
251 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
252 break;
253 case JVM_CONSTANT_Fieldref :
254 // fall through
255 case JVM_CONSTANT_Methodref :
256 // fall through
257 case JVM_CONSTANT_InterfaceMethodref : {
258 if (!_need_verify) break;
259 int klass_ref_index = cp->klass_ref_index_at(index);
260 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
261 check_property(valid_cp_range(klass_ref_index, length) &&
262 is_klass_reference(cp, klass_ref_index),
263 "Invalid constant pool index %u in class file %s",
264 klass_ref_index,
265 CHECK_(nullHandle));
266 check_property(valid_cp_range(name_and_type_ref_index, length) &&
267 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
268 "Invalid constant pool index %u in class file %s",
269 name_and_type_ref_index,
270 CHECK_(nullHandle));
271 break;
272 }
273 case JVM_CONSTANT_String :
274 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
275 break;
276 case JVM_CONSTANT_Integer :
277 break;
278 case JVM_CONSTANT_Float :
279 break;
280 case JVM_CONSTANT_Long :
281 case JVM_CONSTANT_Double :
282 index++;
283 check_property(
284 (index < length && cp->tag_at(index).is_invalid()),
285 "Improper constant pool long/double index %u in class file %s",
286 index, CHECK_(nullHandle));
287 break;
288 case JVM_CONSTANT_NameAndType : {
289 if (!_need_verify) break;
290 int name_ref_index = cp->name_ref_index_at(index);
291 int signature_ref_index = cp->signature_ref_index_at(index);
292 check_property(
293 valid_cp_range(name_ref_index, length) &&
294 cp->tag_at(name_ref_index).is_utf8(),
295 "Invalid constant pool index %u in class file %s",
296 name_ref_index, CHECK_(nullHandle));
297 check_property(
298 valid_cp_range(signature_ref_index, length) &&
299 cp->tag_at(signature_ref_index).is_utf8(),
300 "Invalid constant pool index %u in class file %s",
301 signature_ref_index, CHECK_(nullHandle));
302 break;
303 }
304 case JVM_CONSTANT_Utf8 :
305 break;
306 case JVM_CONSTANT_UnresolvedClass : // fall-through
307 case JVM_CONSTANT_UnresolvedClassInError:
308 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
309 break;
310 case JVM_CONSTANT_ClassIndex :
311 {
312 int class_index = cp->klass_index_at(index);
313 check_property(
314 valid_cp_range(class_index, length) &&
315 cp->tag_at(class_index).is_utf8(),
316 "Invalid constant pool index %u in class file %s",
317 class_index, CHECK_(nullHandle));
318 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
319 }
320 break;
321 case JVM_CONSTANT_UnresolvedString :
322 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
323 break;
324 case JVM_CONSTANT_StringIndex :
325 {
326 int string_index = cp->string_index_at(index);
327 check_property(
328 valid_cp_range(string_index, length) &&
329 cp->tag_at(string_index).is_utf8(),
330 "Invalid constant pool index %u in class file %s",
331 string_index, CHECK_(nullHandle));
332 symbolOop sym = cp->symbol_at(string_index);
333 cp->unresolved_string_at_put(index, sym);
334 }
335 break;
336 default:
337 fatal1("bad constant pool tag value %u", cp->tag_at(index).value());
338 ShouldNotReachHere();
339 break;
340 } // end of switch
341 } // end of for
343 if (_cp_patches != NULL) {
344 // need to treat this_class specially...
345 assert(AnonymousClasses, "");
346 int this_class_index;
347 {
348 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
349 u1* mark = cfs->current();
350 u2 flags = cfs->get_u2_fast();
351 this_class_index = cfs->get_u2_fast();
352 cfs->set_current(mark); // revert to mark
353 }
355 for (index = 1; index < length; index++) { // Index 0 is unused
356 if (has_cp_patch_at(index)) {
357 guarantee_property(index != this_class_index,
358 "Illegal constant pool patch to self at %d in class file %s",
359 index, CHECK_(nullHandle));
360 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
361 }
362 }
363 // Ensure that all the patches have been used.
364 for (index = 0; index < _cp_patches->length(); index++) {
365 guarantee_property(!has_cp_patch_at(index),
366 "Unused constant pool patch at %d in class file %s",
367 index, CHECK_(nullHandle));
368 }
369 }
371 if (!_need_verify) {
372 return cp;
373 }
375 // second verification pass - checks the strings are of the right format.
376 // but not yet to the other entries
377 for (index = 1; index < length; index++) {
378 jbyte tag = cp->tag_at(index).value();
379 switch (tag) {
380 case JVM_CONSTANT_UnresolvedClass: {
381 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
382 // check the name, even if _cp_patches will overwrite it
383 verify_legal_class_name(class_name, CHECK_(nullHandle));
384 break;
385 }
386 case JVM_CONSTANT_Fieldref:
387 case JVM_CONSTANT_Methodref:
388 case JVM_CONSTANT_InterfaceMethodref: {
389 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
390 // already verified to be utf8
391 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
392 // already verified to be utf8
393 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
394 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
395 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
396 if (tag == JVM_CONSTANT_Fieldref) {
397 verify_legal_field_name(name, CHECK_(nullHandle));
398 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
399 } else {
400 verify_legal_method_name(name, CHECK_(nullHandle));
401 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
402 if (tag == JVM_CONSTANT_Methodref) {
403 // 4509014: If a class method name begins with '<', it must be "<init>".
404 assert(!name.is_null(), "method name in constant pool is null");
405 unsigned int name_len = name->utf8_length();
406 assert(name_len > 0, "bad method name"); // already verified as legal name
407 if (name->byte_at(0) == '<') {
408 if (name() != vmSymbols::object_initializer_name()) {
409 classfile_parse_error(
410 "Bad method name at constant pool index %u in class file %s",
411 name_ref_index, CHECK_(nullHandle));
412 }
413 }
414 }
415 }
416 break;
417 }
418 } // end of switch
419 } // end of for
421 return cp;
422 }
425 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
426 assert(AnonymousClasses, "");
427 BasicType patch_type = T_VOID;
428 switch (cp->tag_at(index).value()) {
430 case JVM_CONSTANT_UnresolvedClass :
431 // Patching a class means pre-resolving it.
432 // The name in the constant pool is ignored.
433 if (patch->klass() == SystemDictionary::class_klass()) { // %%% java_lang_Class::is_instance
434 guarantee_property(!java_lang_Class::is_primitive(patch()),
435 "Illegal class patch at %d in class file %s",
436 index, CHECK);
437 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
438 } else {
439 guarantee_property(java_lang_String::is_instance(patch()),
440 "Illegal class patch at %d in class file %s",
441 index, CHECK);
442 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
443 cp->unresolved_klass_at_put(index, name());
444 }
445 break;
447 case JVM_CONSTANT_UnresolvedString :
448 // Patching a string means pre-resolving it.
449 // The spelling in the constant pool is ignored.
450 // The constant reference may be any object whatever.
451 // If it is not a real interned string, the constant is referred
452 // to as a "pseudo-string", and must be presented to the CP
453 // explicitly, because it may require scavenging.
454 cp->pseudo_string_at_put(index, patch());
455 break;
457 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
458 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
459 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
460 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
461 patch_prim:
462 {
463 jvalue value;
464 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
465 guarantee_property(value_type == patch_type,
466 "Illegal primitive patch at %d in class file %s",
467 index, CHECK);
468 switch (value_type) {
469 case T_INT: cp->int_at_put(index, value.i); break;
470 case T_FLOAT: cp->float_at_put(index, value.f); break;
471 case T_LONG: cp->long_at_put(index, value.j); break;
472 case T_DOUBLE: cp->double_at_put(index, value.d); break;
473 default: assert(false, "");
474 }
475 }
476 break;
478 default:
479 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
480 guarantee_property(!has_cp_patch_at(index),
481 "Illegal unexpected patch at %d in class file %s",
482 index, CHECK);
483 return;
484 }
486 // On fall-through, mark the patch as used.
487 clear_cp_patch_at(index);
488 }
492 class NameSigHash: public ResourceObj {
493 public:
494 symbolOop _name; // name
495 symbolOop _sig; // signature
496 NameSigHash* _next; // Next entry in hash table
497 };
500 #define HASH_ROW_SIZE 256
502 unsigned int hash(symbolOop name, symbolOop sig) {
503 unsigned int raw_hash = 0;
504 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
505 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
507 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
508 }
511 void initialize_hashtable(NameSigHash** table) {
512 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
513 }
515 // Return false if the name/sig combination is found in table.
516 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
517 // The old format checker uses heap sort to find duplicates.
518 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
519 // of table since we don't expect symbolOop's to move.
520 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
521 assert(name != NULL, "name in constant pool is NULL");
523 // First lookup for duplicates
524 int index = hash(name, sig);
525 NameSigHash* entry = table[index];
526 while (entry != NULL) {
527 if (entry->_name == name && entry->_sig == sig) {
528 return false;
529 }
530 entry = entry->_next;
531 }
533 // No duplicate is found, allocate a new entry and fill it.
534 entry = new NameSigHash();
535 entry->_name = name;
536 entry->_sig = sig;
538 // Insert into hash table
539 entry->_next = table[index];
540 table[index] = entry;
542 return true;
543 }
546 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
547 int length,
548 Handle class_loader,
549 Handle protection_domain,
550 PerfTraceTime* vmtimer,
551 symbolHandle class_name,
552 TRAPS) {
553 ClassFileStream* cfs = stream();
554 assert(length > 0, "only called for length>0");
555 objArrayHandle nullHandle;
556 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
557 objArrayHandle interfaces (THREAD, interface_oop);
559 int index;
560 for (index = 0; index < length; index++) {
561 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
562 KlassHandle interf;
563 check_property(
564 valid_cp_range(interface_index, cp->length()) &&
565 is_klass_reference(cp, interface_index),
566 "Interface name has bad constant pool index %u in class file %s",
567 interface_index, CHECK_(nullHandle));
568 if (cp->tag_at(interface_index).is_klass()) {
569 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
570 } else {
571 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
573 // Don't need to check legal name because it's checked when parsing constant pool.
574 // But need to make sure it's not an array type.
575 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
576 "Bad interface name in class file %s", CHECK_(nullHandle));
578 vmtimer->suspend(); // do not count recursive loading twice
579 // Call resolve_super so classcircularity is checked
580 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
581 unresolved_klass, class_loader, protection_domain,
582 false, CHECK_(nullHandle));
583 interf = KlassHandle(THREAD, k);
584 vmtimer->resume();
586 if (LinkWellKnownClasses) // my super type is well known to me
587 cp->klass_at_put(interface_index, interf()); // eagerly resolve
588 }
590 if (!Klass::cast(interf())->is_interface()) {
591 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
592 }
593 interfaces->obj_at_put(index, interf());
594 }
596 if (!_need_verify || length <= 1) {
597 return interfaces;
598 }
600 // Check if there's any duplicates in interfaces
601 ResourceMark rm(THREAD);
602 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
603 THREAD, NameSigHash*, HASH_ROW_SIZE);
604 initialize_hashtable(interface_names);
605 bool dup = false;
606 {
607 debug_only(No_Safepoint_Verifier nsv;)
608 for (index = 0; index < length; index++) {
609 klassOop k = (klassOop)interfaces->obj_at(index);
610 symbolOop name = instanceKlass::cast(k)->name();
611 // If no duplicates, add (name, NULL) in hashtable interface_names.
612 if (!put_after_lookup(name, NULL, interface_names)) {
613 dup = true;
614 break;
615 }
616 }
617 }
618 if (dup) {
619 classfile_parse_error("Duplicate interface name in class file %s",
620 CHECK_(nullHandle));
621 }
623 return interfaces;
624 }
627 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
628 // Make sure the constant pool entry is of a type appropriate to this field
629 guarantee_property(
630 (constantvalue_index > 0 &&
631 constantvalue_index < cp->length()),
632 "Bad initial value index %u in ConstantValue attribute in class file %s",
633 constantvalue_index, CHECK);
634 constantTag value_type = cp->tag_at(constantvalue_index);
635 switch ( cp->basic_type_for_signature_at(signature_index) ) {
636 case T_LONG:
637 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
638 break;
639 case T_FLOAT:
640 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
641 break;
642 case T_DOUBLE:
643 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
644 break;
645 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
646 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
647 break;
648 case T_OBJECT:
649 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18)
650 && (value_type.is_string() || value_type.is_unresolved_string())),
651 "Bad string initial value in class file %s", CHECK);
652 break;
653 default:
654 classfile_parse_error(
655 "Unable to set initial value %u in class file %s",
656 constantvalue_index, CHECK);
657 }
658 }
661 // Parse attributes for a field.
662 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
663 u2 attributes_count,
664 bool is_static, u2 signature_index,
665 u2* constantvalue_index_addr,
666 bool* is_synthetic_addr,
667 u2* generic_signature_index_addr,
668 typeArrayHandle* field_annotations,
669 TRAPS) {
670 ClassFileStream* cfs = stream();
671 assert(attributes_count > 0, "length should be greater than 0");
672 u2 constantvalue_index = 0;
673 u2 generic_signature_index = 0;
674 bool is_synthetic = false;
675 u1* runtime_visible_annotations = NULL;
676 int runtime_visible_annotations_length = 0;
677 u1* runtime_invisible_annotations = NULL;
678 int runtime_invisible_annotations_length = 0;
679 while (attributes_count--) {
680 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
681 u2 attribute_name_index = cfs->get_u2_fast();
682 u4 attribute_length = cfs->get_u4_fast();
683 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
684 cp->tag_at(attribute_name_index).is_utf8(),
685 "Invalid field attribute index %u in class file %s",
686 attribute_name_index,
687 CHECK);
688 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
689 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
690 // ignore if non-static
691 if (constantvalue_index != 0) {
692 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
693 }
694 check_property(
695 attribute_length == 2,
696 "Invalid ConstantValue field attribute length %u in class file %s",
697 attribute_length, CHECK);
698 constantvalue_index = cfs->get_u2(CHECK);
699 if (_need_verify) {
700 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
701 }
702 } else if (attribute_name == vmSymbols::tag_synthetic()) {
703 if (attribute_length != 0) {
704 classfile_parse_error(
705 "Invalid Synthetic field attribute length %u in class file %s",
706 attribute_length, CHECK);
707 }
708 is_synthetic = true;
709 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
710 if (attribute_length != 0) {
711 classfile_parse_error(
712 "Invalid Deprecated field attribute length %u in class file %s",
713 attribute_length, CHECK);
714 }
715 } else if (_major_version >= JAVA_1_5_VERSION) {
716 if (attribute_name == vmSymbols::tag_signature()) {
717 if (attribute_length != 2) {
718 classfile_parse_error(
719 "Wrong size %u for field's Signature attribute in class file %s",
720 attribute_length, CHECK);
721 }
722 generic_signature_index = cfs->get_u2(CHECK);
723 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
724 runtime_visible_annotations_length = attribute_length;
725 runtime_visible_annotations = cfs->get_u1_buffer();
726 assert(runtime_visible_annotations != NULL, "null visible annotations");
727 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
728 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
729 runtime_invisible_annotations_length = attribute_length;
730 runtime_invisible_annotations = cfs->get_u1_buffer();
731 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
732 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
733 } else {
734 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
735 }
736 } else {
737 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
738 }
739 }
741 *constantvalue_index_addr = constantvalue_index;
742 *is_synthetic_addr = is_synthetic;
743 *generic_signature_index_addr = generic_signature_index;
744 *field_annotations = assemble_annotations(runtime_visible_annotations,
745 runtime_visible_annotations_length,
746 runtime_invisible_annotations,
747 runtime_invisible_annotations_length,
748 CHECK);
749 return;
750 }
753 // Field allocation types. Used for computing field offsets.
755 enum FieldAllocationType {
756 STATIC_OOP, // Oops
757 STATIC_BYTE, // Boolean, Byte, char
758 STATIC_SHORT, // shorts
759 STATIC_WORD, // ints
760 STATIC_DOUBLE, // long or double
761 STATIC_ALIGNED_DOUBLE,// aligned long or double
762 NONSTATIC_OOP,
763 NONSTATIC_BYTE,
764 NONSTATIC_SHORT,
765 NONSTATIC_WORD,
766 NONSTATIC_DOUBLE,
767 NONSTATIC_ALIGNED_DOUBLE
768 };
771 struct FieldAllocationCount {
772 int static_oop_count;
773 int static_byte_count;
774 int static_short_count;
775 int static_word_count;
776 int static_double_count;
777 int nonstatic_oop_count;
778 int nonstatic_byte_count;
779 int nonstatic_short_count;
780 int nonstatic_word_count;
781 int nonstatic_double_count;
782 };
784 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
785 struct FieldAllocationCount *fac,
786 objArrayHandle* fields_annotations, TRAPS) {
787 ClassFileStream* cfs = stream();
788 typeArrayHandle nullHandle;
789 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
790 u2 length = cfs->get_u2_fast();
791 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
792 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
793 typeArrayHandle fields(THREAD, new_fields);
795 int index = 0;
796 typeArrayHandle field_annotations;
797 for (int n = 0; n < length; n++) {
798 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
800 AccessFlags access_flags;
801 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
802 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
803 access_flags.set_flags(flags);
805 u2 name_index = cfs->get_u2_fast();
806 int cp_size = cp->length();
807 check_property(
808 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
809 "Invalid constant pool index %u for field name in class file %s",
810 name_index, CHECK_(nullHandle));
811 symbolHandle name(THREAD, cp->symbol_at(name_index));
812 verify_legal_field_name(name, CHECK_(nullHandle));
814 u2 signature_index = cfs->get_u2_fast();
815 check_property(
816 valid_cp_range(signature_index, cp_size) &&
817 cp->tag_at(signature_index).is_utf8(),
818 "Invalid constant pool index %u for field signature in class file %s",
819 signature_index, CHECK_(nullHandle));
820 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
821 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
823 u2 constantvalue_index = 0;
824 bool is_synthetic = false;
825 u2 generic_signature_index = 0;
826 bool is_static = access_flags.is_static();
828 u2 attributes_count = cfs->get_u2_fast();
829 if (attributes_count > 0) {
830 parse_field_attributes(cp, attributes_count, is_static, signature_index,
831 &constantvalue_index, &is_synthetic,
832 &generic_signature_index, &field_annotations,
833 CHECK_(nullHandle));
834 if (field_annotations.not_null()) {
835 if (fields_annotations->is_null()) {
836 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
837 *fields_annotations = objArrayHandle(THREAD, md);
838 }
839 (*fields_annotations)->obj_at_put(n, field_annotations());
840 }
841 if (is_synthetic) {
842 access_flags.set_is_synthetic();
843 }
844 }
846 fields->short_at_put(index++, access_flags.as_short());
847 fields->short_at_put(index++, name_index);
848 fields->short_at_put(index++, signature_index);
849 fields->short_at_put(index++, constantvalue_index);
851 // Remember how many oops we encountered and compute allocation type
852 BasicType type = cp->basic_type_for_signature_at(signature_index);
853 FieldAllocationType atype;
854 if ( is_static ) {
855 switch ( type ) {
856 case T_BOOLEAN:
857 case T_BYTE:
858 fac->static_byte_count++;
859 atype = STATIC_BYTE;
860 break;
861 case T_LONG:
862 case T_DOUBLE:
863 if (Universe::field_type_should_be_aligned(type)) {
864 atype = STATIC_ALIGNED_DOUBLE;
865 } else {
866 atype = STATIC_DOUBLE;
867 }
868 fac->static_double_count++;
869 break;
870 case T_CHAR:
871 case T_SHORT:
872 fac->static_short_count++;
873 atype = STATIC_SHORT;
874 break;
875 case T_FLOAT:
876 case T_INT:
877 fac->static_word_count++;
878 atype = STATIC_WORD;
879 break;
880 case T_ARRAY:
881 case T_OBJECT:
882 fac->static_oop_count++;
883 atype = STATIC_OOP;
884 break;
885 case T_ADDRESS:
886 case T_VOID:
887 default:
888 assert(0, "bad field type");
889 }
890 } else {
891 switch ( type ) {
892 case T_BOOLEAN:
893 case T_BYTE:
894 fac->nonstatic_byte_count++;
895 atype = NONSTATIC_BYTE;
896 break;
897 case T_LONG:
898 case T_DOUBLE:
899 if (Universe::field_type_should_be_aligned(type)) {
900 atype = NONSTATIC_ALIGNED_DOUBLE;
901 } else {
902 atype = NONSTATIC_DOUBLE;
903 }
904 fac->nonstatic_double_count++;
905 break;
906 case T_CHAR:
907 case T_SHORT:
908 fac->nonstatic_short_count++;
909 atype = NONSTATIC_SHORT;
910 break;
911 case T_FLOAT:
912 case T_INT:
913 fac->nonstatic_word_count++;
914 atype = NONSTATIC_WORD;
915 break;
916 case T_ARRAY:
917 case T_OBJECT:
918 fac->nonstatic_oop_count++;
919 atype = NONSTATIC_OOP;
920 break;
921 case T_ADDRESS:
922 case T_VOID:
923 default:
924 assert(0, "bad field type");
925 }
926 }
928 // The correct offset is computed later (all oop fields will be located together)
929 // We temporarily store the allocation type in the offset field
930 fields->short_at_put(index++, atype);
931 fields->short_at_put(index++, 0); // Clear out high word of byte offset
932 fields->short_at_put(index++, generic_signature_index);
933 }
935 if (_need_verify && length > 1) {
936 // Check duplicated fields
937 ResourceMark rm(THREAD);
938 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
939 THREAD, NameSigHash*, HASH_ROW_SIZE);
940 initialize_hashtable(names_and_sigs);
941 bool dup = false;
942 {
943 debug_only(No_Safepoint_Verifier nsv;)
944 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
945 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
946 symbolOop name = cp->symbol_at(name_index);
947 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
948 symbolOop sig = cp->symbol_at(sig_index);
949 // If no duplicates, add name/signature in hashtable names_and_sigs.
950 if (!put_after_lookup(name, sig, names_and_sigs)) {
951 dup = true;
952 break;
953 }
954 }
955 }
956 if (dup) {
957 classfile_parse_error("Duplicate field name&signature in class file %s",
958 CHECK_(nullHandle));
959 }
960 }
962 return fields;
963 }
966 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
967 while (length-- > 0) {
968 *dest++ = Bytes::get_Java_u2((u1*) (src++));
969 }
970 }
973 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
974 u4 exception_table_length,
975 constantPoolHandle cp,
976 TRAPS) {
977 ClassFileStream* cfs = stream();
978 typeArrayHandle nullHandle;
980 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
981 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
982 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
984 int index = 0;
985 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
986 for (unsigned int i = 0; i < exception_table_length; i++) {
987 u2 start_pc = cfs->get_u2_fast();
988 u2 end_pc = cfs->get_u2_fast();
989 u2 handler_pc = cfs->get_u2_fast();
990 u2 catch_type_index = cfs->get_u2_fast();
991 // Will check legal target after parsing code array in verifier.
992 if (_need_verify) {
993 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
994 "Illegal exception table range in class file %s", CHECK_(nullHandle));
995 guarantee_property(handler_pc < code_length,
996 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
997 if (catch_type_index != 0) {
998 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
999 is_klass_reference(cp, catch_type_index),
1000 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1001 }
1002 }
1003 exception_handlers->int_at_put(index++, start_pc);
1004 exception_handlers->int_at_put(index++, end_pc);
1005 exception_handlers->int_at_put(index++, handler_pc);
1006 exception_handlers->int_at_put(index++, catch_type_index);
1007 }
1008 return exception_handlers;
1009 }
1011 void ClassFileParser::parse_linenumber_table(
1012 u4 code_attribute_length, u4 code_length,
1013 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1014 ClassFileStream* cfs = stream();
1015 unsigned int num_entries = cfs->get_u2(CHECK);
1017 // Each entry is a u2 start_pc, and a u2 line_number
1018 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1020 // Verify line number attribute and table length
1021 check_property(
1022 code_attribute_length == sizeof(u2) + length_in_bytes,
1023 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1025 cfs->guarantee_more(length_in_bytes, CHECK);
1027 if ((*write_stream) == NULL) {
1028 if (length_in_bytes > fixed_buffer_size) {
1029 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1030 } else {
1031 (*write_stream) = new CompressedLineNumberWriteStream(
1032 linenumbertable_buffer, fixed_buffer_size);
1033 }
1034 }
1036 while (num_entries-- > 0) {
1037 u2 bci = cfs->get_u2_fast(); // start_pc
1038 u2 line = cfs->get_u2_fast(); // line_number
1039 guarantee_property(bci < code_length,
1040 "Invalid pc in LineNumberTable in class file %s", CHECK);
1041 (*write_stream)->write_pair(bci, line);
1042 }
1043 }
1046 // Class file LocalVariableTable elements.
1047 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1048 public:
1049 u2 start_bci;
1050 u2 length;
1051 u2 name_cp_index;
1052 u2 descriptor_cp_index;
1053 u2 slot;
1054 };
1057 class LVT_Hash: public CHeapObj {
1058 public:
1059 LocalVariableTableElement *_elem; // element
1060 LVT_Hash* _next; // Next entry in hash table
1061 };
1063 unsigned int hash(LocalVariableTableElement *elem) {
1064 unsigned int raw_hash = elem->start_bci;
1066 raw_hash = elem->length + raw_hash * 37;
1067 raw_hash = elem->name_cp_index + raw_hash * 37;
1068 raw_hash = elem->slot + raw_hash * 37;
1070 return raw_hash % HASH_ROW_SIZE;
1071 }
1073 void initialize_hashtable(LVT_Hash** table) {
1074 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1075 table[i] = NULL;
1076 }
1077 }
1079 void clear_hashtable(LVT_Hash** table) {
1080 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1081 LVT_Hash* current = table[i];
1082 LVT_Hash* next;
1083 while (current != NULL) {
1084 next = current->_next;
1085 current->_next = NULL;
1086 delete(current);
1087 current = next;
1088 }
1089 table[i] = NULL;
1090 }
1091 }
1093 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1094 LVT_Hash* entry = table[index];
1096 /*
1097 * 3-tuple start_bci/length/slot has to be unique key,
1098 * so the following comparison seems to be redundant:
1099 * && elem->name_cp_index == entry->_elem->name_cp_index
1100 */
1101 while (entry != NULL) {
1102 if (elem->start_bci == entry->_elem->start_bci
1103 && elem->length == entry->_elem->length
1104 && elem->name_cp_index == entry->_elem->name_cp_index
1105 && elem->slot == entry->_elem->slot
1106 ) {
1107 return entry;
1108 }
1109 entry = entry->_next;
1110 }
1111 return NULL;
1112 }
1114 // Return false if the local variable is found in table.
1115 // Return true if no duplicate is found.
1116 // And local variable is added as a new entry in table.
1117 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1118 // First lookup for duplicates
1119 int index = hash(elem);
1120 LVT_Hash* entry = LVT_lookup(elem, index, table);
1122 if (entry != NULL) {
1123 return false;
1124 }
1125 // No duplicate is found, allocate a new entry and fill it.
1126 if ((entry = new LVT_Hash()) == NULL) {
1127 return false;
1128 }
1129 entry->_elem = elem;
1131 // Insert into hash table
1132 entry->_next = table[index];
1133 table[index] = entry;
1135 return true;
1136 }
1138 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1139 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1140 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1141 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1142 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1143 lvt->signature_cp_index = 0;
1144 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1145 }
1147 // Function is used to parse both attributes:
1148 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1149 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1150 u2 max_locals,
1151 u4 code_attribute_length,
1152 constantPoolHandle cp,
1153 u2* localvariable_table_length,
1154 bool isLVTT,
1155 TRAPS) {
1156 ClassFileStream* cfs = stream();
1157 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1158 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1159 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1160 // Verify local variable table attribute has right length
1161 if (_need_verify) {
1162 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1163 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1164 }
1165 u2* localvariable_table_start = cfs->get_u2_buffer();
1166 assert(localvariable_table_start != NULL, "null local variable table");
1167 if (!_need_verify) {
1168 cfs->skip_u2_fast(size);
1169 } else {
1170 cfs->guarantee_more(size * 2, CHECK_NULL);
1171 for(int i = 0; i < (*localvariable_table_length); i++) {
1172 u2 start_pc = cfs->get_u2_fast();
1173 u2 length = cfs->get_u2_fast();
1174 u2 name_index = cfs->get_u2_fast();
1175 u2 descriptor_index = cfs->get_u2_fast();
1176 u2 index = cfs->get_u2_fast();
1177 // Assign to a u4 to avoid overflow
1178 u4 end_pc = (u4)start_pc + (u4)length;
1180 if (start_pc >= code_length) {
1181 classfile_parse_error(
1182 "Invalid start_pc %u in %s in class file %s",
1183 start_pc, tbl_name, CHECK_NULL);
1184 }
1185 if (end_pc > code_length) {
1186 classfile_parse_error(
1187 "Invalid length %u in %s in class file %s",
1188 length, tbl_name, CHECK_NULL);
1189 }
1190 int cp_size = cp->length();
1191 guarantee_property(
1192 valid_cp_range(name_index, cp_size) &&
1193 cp->tag_at(name_index).is_utf8(),
1194 "Name index %u in %s has bad constant type in class file %s",
1195 name_index, tbl_name, CHECK_NULL);
1196 guarantee_property(
1197 valid_cp_range(descriptor_index, cp_size) &&
1198 cp->tag_at(descriptor_index).is_utf8(),
1199 "Signature index %u in %s has bad constant type in class file %s",
1200 descriptor_index, tbl_name, CHECK_NULL);
1202 symbolHandle name(THREAD, cp->symbol_at(name_index));
1203 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1204 verify_legal_field_name(name, CHECK_NULL);
1205 u2 extra_slot = 0;
1206 if (!isLVTT) {
1207 verify_legal_field_signature(name, sig, CHECK_NULL);
1209 // 4894874: check special cases for double and long local variables
1210 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1211 sig() == vmSymbols::type_signature(T_LONG)) {
1212 extra_slot = 1;
1213 }
1214 }
1215 guarantee_property((index + extra_slot) < max_locals,
1216 "Invalid index %u in %s in class file %s",
1217 index, tbl_name, CHECK_NULL);
1218 }
1219 }
1220 return localvariable_table_start;
1221 }
1224 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1225 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1226 ClassFileStream* cfs = stream();
1227 u2 index = 0; // index in the array with long/double occupying two slots
1228 u4 i1 = *u1_index;
1229 u4 i2 = *u2_index + 1;
1230 for(int i = 0; i < array_length; i++) {
1231 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1232 index++;
1233 if (tag == ITEM_Long || tag == ITEM_Double) {
1234 index++;
1235 } else if (tag == ITEM_Object) {
1236 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1237 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1238 is_klass_reference(cp, class_index),
1239 "Bad class index %u in StackMap in class file %s",
1240 class_index, CHECK);
1241 } else if (tag == ITEM_Uninitialized) {
1242 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1243 guarantee_property(
1244 offset < code_length,
1245 "Bad uninitialized type offset %u in StackMap in class file %s",
1246 offset, CHECK);
1247 } else {
1248 guarantee_property(
1249 tag <= (u1)ITEM_Uninitialized,
1250 "Unknown variable type %u in StackMap in class file %s",
1251 tag, CHECK);
1252 }
1253 }
1254 u2_array[*u2_index] = index;
1255 *u1_index = i1;
1256 *u2_index = i2;
1257 }
1259 typeArrayOop ClassFileParser::parse_stackmap_table(
1260 u4 code_attribute_length, TRAPS) {
1261 if (code_attribute_length == 0)
1262 return NULL;
1264 ClassFileStream* cfs = stream();
1265 u1* stackmap_table_start = cfs->get_u1_buffer();
1266 assert(stackmap_table_start != NULL, "null stackmap table");
1268 // check code_attribute_length first
1269 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1271 if (!_need_verify && !DumpSharedSpaces) {
1272 return NULL;
1273 }
1275 typeArrayOop stackmap_data =
1276 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1278 stackmap_data->set_length(code_attribute_length);
1279 memcpy((void*)stackmap_data->byte_at_addr(0),
1280 (void*)stackmap_table_start, code_attribute_length);
1281 return stackmap_data;
1282 }
1284 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1285 u4 method_attribute_length,
1286 constantPoolHandle cp, TRAPS) {
1287 ClassFileStream* cfs = stream();
1288 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1289 *checked_exceptions_length = cfs->get_u2_fast();
1290 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1291 u2* checked_exceptions_start = cfs->get_u2_buffer();
1292 assert(checked_exceptions_start != NULL, "null checked exceptions");
1293 if (!_need_verify) {
1294 cfs->skip_u2_fast(size);
1295 } else {
1296 // Verify each value in the checked exception table
1297 u2 checked_exception;
1298 u2 len = *checked_exceptions_length;
1299 cfs->guarantee_more(2 * len, CHECK_NULL);
1300 for (int i = 0; i < len; i++) {
1301 checked_exception = cfs->get_u2_fast();
1302 check_property(
1303 valid_cp_range(checked_exception, cp->length()) &&
1304 is_klass_reference(cp, checked_exception),
1305 "Exception name has bad type at constant pool %u in class file %s",
1306 checked_exception, CHECK_NULL);
1307 }
1308 }
1309 // check exceptions attribute length
1310 if (_need_verify) {
1311 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1312 sizeof(u2) * size),
1313 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1314 }
1315 return checked_exceptions_start;
1316 }
1319 #define MAX_ARGS_SIZE 255
1320 #define MAX_CODE_SIZE 65535
1321 #define INITIAL_MAX_LVT_NUMBER 256
1323 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1324 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1325 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1326 // entire method attribute is parsed.
1327 //
1328 // The promoted_flags parameter is used to pass relevant access_flags
1329 // from the method back up to the containing klass. These flag values
1330 // are added to klass's access_flags.
1332 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1333 AccessFlags *promoted_flags,
1334 typeArrayHandle* method_annotations,
1335 typeArrayHandle* method_parameter_annotations,
1336 typeArrayHandle* method_default_annotations,
1337 TRAPS) {
1338 ClassFileStream* cfs = stream();
1339 methodHandle nullHandle;
1340 ResourceMark rm(THREAD);
1341 // Parse fixed parts
1342 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1344 int flags = cfs->get_u2_fast();
1345 u2 name_index = cfs->get_u2_fast();
1346 int cp_size = cp->length();
1347 check_property(
1348 valid_cp_range(name_index, cp_size) &&
1349 cp->tag_at(name_index).is_utf8(),
1350 "Illegal constant pool index %u for method name in class file %s",
1351 name_index, CHECK_(nullHandle));
1352 symbolHandle name(THREAD, cp->symbol_at(name_index));
1353 verify_legal_method_name(name, CHECK_(nullHandle));
1355 u2 signature_index = cfs->get_u2_fast();
1356 guarantee_property(
1357 valid_cp_range(signature_index, cp_size) &&
1358 cp->tag_at(signature_index).is_utf8(),
1359 "Illegal constant pool index %u for method signature in class file %s",
1360 signature_index, CHECK_(nullHandle));
1361 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1363 AccessFlags access_flags;
1364 if (name == vmSymbols::class_initializer_name()) {
1365 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1366 flags = JVM_ACC_STATIC;
1367 } else {
1368 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1369 }
1371 int args_size = -1; // only used when _need_verify is true
1372 if (_need_verify) {
1373 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1374 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1375 if (args_size > MAX_ARGS_SIZE) {
1376 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1377 }
1378 }
1380 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1382 // Default values for code and exceptions attribute elements
1383 u2 max_stack = 0;
1384 u2 max_locals = 0;
1385 u4 code_length = 0;
1386 u1* code_start = 0;
1387 u2 exception_table_length = 0;
1388 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1389 u2 checked_exceptions_length = 0;
1390 u2* checked_exceptions_start = NULL;
1391 CompressedLineNumberWriteStream* linenumber_table = NULL;
1392 int linenumber_table_length = 0;
1393 int total_lvt_length = 0;
1394 u2 lvt_cnt = 0;
1395 u2 lvtt_cnt = 0;
1396 bool lvt_allocated = false;
1397 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1398 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1399 u2* localvariable_table_length;
1400 u2** localvariable_table_start;
1401 u2* localvariable_type_table_length;
1402 u2** localvariable_type_table_start;
1403 bool parsed_code_attribute = false;
1404 bool parsed_checked_exceptions_attribute = false;
1405 bool parsed_stackmap_attribute = false;
1406 // stackmap attribute - JDK1.5
1407 typeArrayHandle stackmap_data;
1408 u2 generic_signature_index = 0;
1409 u1* runtime_visible_annotations = NULL;
1410 int runtime_visible_annotations_length = 0;
1411 u1* runtime_invisible_annotations = NULL;
1412 int runtime_invisible_annotations_length = 0;
1413 u1* runtime_visible_parameter_annotations = NULL;
1414 int runtime_visible_parameter_annotations_length = 0;
1415 u1* runtime_invisible_parameter_annotations = NULL;
1416 int runtime_invisible_parameter_annotations_length = 0;
1417 u1* annotation_default = NULL;
1418 int annotation_default_length = 0;
1420 // Parse code and exceptions attribute
1421 u2 method_attributes_count = cfs->get_u2_fast();
1422 while (method_attributes_count--) {
1423 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1424 u2 method_attribute_name_index = cfs->get_u2_fast();
1425 u4 method_attribute_length = cfs->get_u4_fast();
1426 check_property(
1427 valid_cp_range(method_attribute_name_index, cp_size) &&
1428 cp->tag_at(method_attribute_name_index).is_utf8(),
1429 "Invalid method attribute name index %u in class file %s",
1430 method_attribute_name_index, CHECK_(nullHandle));
1432 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1433 if (method_attribute_name == vmSymbols::tag_code()) {
1434 // Parse Code attribute
1435 if (_need_verify) {
1436 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1437 "Code attribute in native or abstract methods in class file %s",
1438 CHECK_(nullHandle));
1439 }
1440 if (parsed_code_attribute) {
1441 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1442 }
1443 parsed_code_attribute = true;
1445 // Stack size, locals size, and code size
1446 if (_major_version == 45 && _minor_version <= 2) {
1447 cfs->guarantee_more(4, CHECK_(nullHandle));
1448 max_stack = cfs->get_u1_fast();
1449 max_locals = cfs->get_u1_fast();
1450 code_length = cfs->get_u2_fast();
1451 } else {
1452 cfs->guarantee_more(8, CHECK_(nullHandle));
1453 max_stack = cfs->get_u2_fast();
1454 max_locals = cfs->get_u2_fast();
1455 code_length = cfs->get_u4_fast();
1456 }
1457 if (_need_verify) {
1458 guarantee_property(args_size <= max_locals,
1459 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1460 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1461 "Invalid method Code length %u in class file %s",
1462 code_length, CHECK_(nullHandle));
1463 }
1464 // Code pointer
1465 code_start = cfs->get_u1_buffer();
1466 assert(code_start != NULL, "null code start");
1467 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1468 cfs->skip_u1_fast(code_length);
1470 // Exception handler table
1471 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1472 exception_table_length = cfs->get_u2_fast();
1473 if (exception_table_length > 0) {
1474 exception_handlers =
1475 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1476 }
1478 // Parse additional attributes in code attribute
1479 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1480 u2 code_attributes_count = cfs->get_u2_fast();
1482 unsigned int calculated_attribute_length = 0;
1484 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1485 calculated_attribute_length =
1486 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1487 } else {
1488 // max_stack, locals and length are smaller in pre-version 45.2 classes
1489 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1490 }
1491 calculated_attribute_length +=
1492 code_length +
1493 sizeof(exception_table_length) +
1494 sizeof(code_attributes_count) +
1495 exception_table_length *
1496 ( sizeof(u2) + // start_pc
1497 sizeof(u2) + // end_pc
1498 sizeof(u2) + // handler_pc
1499 sizeof(u2) ); // catch_type_index
1501 while (code_attributes_count--) {
1502 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1503 u2 code_attribute_name_index = cfs->get_u2_fast();
1504 u4 code_attribute_length = cfs->get_u4_fast();
1505 calculated_attribute_length += code_attribute_length +
1506 sizeof(code_attribute_name_index) +
1507 sizeof(code_attribute_length);
1508 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1509 cp->tag_at(code_attribute_name_index).is_utf8(),
1510 "Invalid code attribute name index %u in class file %s",
1511 code_attribute_name_index,
1512 CHECK_(nullHandle));
1513 if (LoadLineNumberTables &&
1514 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1515 // Parse and compress line number table
1516 parse_linenumber_table(code_attribute_length, code_length,
1517 &linenumber_table, CHECK_(nullHandle));
1519 } else if (LoadLocalVariableTables &&
1520 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1521 // Parse local variable table
1522 if (!lvt_allocated) {
1523 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1524 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1525 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1526 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1527 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1528 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1529 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1530 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1531 lvt_allocated = true;
1532 }
1533 if (lvt_cnt == max_lvt_cnt) {
1534 max_lvt_cnt <<= 1;
1535 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1536 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1537 }
1538 localvariable_table_start[lvt_cnt] =
1539 parse_localvariable_table(code_length,
1540 max_locals,
1541 code_attribute_length,
1542 cp,
1543 &localvariable_table_length[lvt_cnt],
1544 false, // is not LVTT
1545 CHECK_(nullHandle));
1546 total_lvt_length += localvariable_table_length[lvt_cnt];
1547 lvt_cnt++;
1548 } else if (LoadLocalVariableTypeTables &&
1549 _major_version >= JAVA_1_5_VERSION &&
1550 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1551 if (!lvt_allocated) {
1552 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1553 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1554 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1555 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1556 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1557 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1558 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1559 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1560 lvt_allocated = true;
1561 }
1562 // Parse local variable type table
1563 if (lvtt_cnt == max_lvtt_cnt) {
1564 max_lvtt_cnt <<= 1;
1565 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1566 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1567 }
1568 localvariable_type_table_start[lvtt_cnt] =
1569 parse_localvariable_table(code_length,
1570 max_locals,
1571 code_attribute_length,
1572 cp,
1573 &localvariable_type_table_length[lvtt_cnt],
1574 true, // is LVTT
1575 CHECK_(nullHandle));
1576 lvtt_cnt++;
1577 } else if (UseSplitVerifier &&
1578 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1579 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1580 // Stack map is only needed by the new verifier in JDK1.5.
1581 if (parsed_stackmap_attribute) {
1582 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1583 }
1584 typeArrayOop sm =
1585 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1586 stackmap_data = typeArrayHandle(THREAD, sm);
1587 parsed_stackmap_attribute = true;
1588 } else {
1589 // Skip unknown attributes
1590 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1591 }
1592 }
1593 // check method attribute length
1594 if (_need_verify) {
1595 guarantee_property(method_attribute_length == calculated_attribute_length,
1596 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1597 }
1598 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1599 // Parse Exceptions attribute
1600 if (parsed_checked_exceptions_attribute) {
1601 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1602 }
1603 parsed_checked_exceptions_attribute = true;
1604 checked_exceptions_start =
1605 parse_checked_exceptions(&checked_exceptions_length,
1606 method_attribute_length,
1607 cp, CHECK_(nullHandle));
1608 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1609 if (method_attribute_length != 0) {
1610 classfile_parse_error(
1611 "Invalid Synthetic method attribute length %u in class file %s",
1612 method_attribute_length, CHECK_(nullHandle));
1613 }
1614 // Should we check that there hasn't already been a synthetic attribute?
1615 access_flags.set_is_synthetic();
1616 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1617 if (method_attribute_length != 0) {
1618 classfile_parse_error(
1619 "Invalid Deprecated method attribute length %u in class file %s",
1620 method_attribute_length, CHECK_(nullHandle));
1621 }
1622 } else if (_major_version >= JAVA_1_5_VERSION) {
1623 if (method_attribute_name == vmSymbols::tag_signature()) {
1624 if (method_attribute_length != 2) {
1625 classfile_parse_error(
1626 "Invalid Signature attribute length %u in class file %s",
1627 method_attribute_length, CHECK_(nullHandle));
1628 }
1629 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1630 generic_signature_index = cfs->get_u2_fast();
1631 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1632 runtime_visible_annotations_length = method_attribute_length;
1633 runtime_visible_annotations = cfs->get_u1_buffer();
1634 assert(runtime_visible_annotations != NULL, "null visible annotations");
1635 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1636 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1637 runtime_invisible_annotations_length = method_attribute_length;
1638 runtime_invisible_annotations = cfs->get_u1_buffer();
1639 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1640 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1641 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1642 runtime_visible_parameter_annotations_length = method_attribute_length;
1643 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1644 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1645 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1646 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1647 runtime_invisible_parameter_annotations_length = method_attribute_length;
1648 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1649 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1650 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1651 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1652 annotation_default_length = method_attribute_length;
1653 annotation_default = cfs->get_u1_buffer();
1654 assert(annotation_default != NULL, "null annotation default");
1655 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1656 } else {
1657 // Skip unknown attributes
1658 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1659 }
1660 } else {
1661 // Skip unknown attributes
1662 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1663 }
1664 }
1666 if (linenumber_table != NULL) {
1667 linenumber_table->write_terminator();
1668 linenumber_table_length = linenumber_table->position();
1669 }
1671 // Make sure there's at least one Code attribute in non-native/non-abstract method
1672 if (_need_verify) {
1673 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1674 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1675 }
1677 // All sizing information for a methodOop is finally available, now create it
1678 methodOop m_oop = oopFactory::new_method(
1679 code_length, access_flags, linenumber_table_length,
1680 total_lvt_length, checked_exceptions_length,
1681 methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1682 methodHandle m (THREAD, m_oop);
1684 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1686 // Fill in information from fixed part (access_flags already set)
1687 m->set_constants(cp());
1688 m->set_name_index(name_index);
1689 m->set_signature_index(signature_index);
1690 m->set_generic_signature_index(generic_signature_index);
1691 #ifdef CC_INTERP
1692 // hmm is there a gc issue here??
1693 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1694 m->set_result_index(rtf.type());
1695 #endif
1697 if (args_size >= 0) {
1698 m->set_size_of_parameters(args_size);
1699 } else {
1700 m->compute_size_of_parameters(THREAD);
1701 }
1702 #ifdef ASSERT
1703 if (args_size >= 0) {
1704 m->compute_size_of_parameters(THREAD);
1705 assert(args_size == m->size_of_parameters(), "");
1706 }
1707 #endif
1709 // Fill in code attribute information
1710 m->set_max_stack(max_stack);
1711 m->set_max_locals(max_locals);
1712 m->constMethod()->set_stackmap_data(stackmap_data());
1714 /**
1715 * The exception_table field is the flag used to indicate
1716 * that the methodOop and it's associated constMethodOop are partially
1717 * initialized and thus are exempt from pre/post GC verification. Once
1718 * the field is set, the oops are considered fully initialized so make
1719 * sure that the oops can pass verification when this field is set.
1720 */
1721 m->set_exception_table(exception_handlers());
1723 // Copy byte codes
1724 if (code_length > 0) {
1725 memcpy(m->code_base(), code_start, code_length);
1726 }
1728 // Copy line number table
1729 if (linenumber_table != NULL) {
1730 memcpy(m->compressed_linenumber_table(),
1731 linenumber_table->buffer(), linenumber_table_length);
1732 }
1734 // Copy checked exceptions
1735 if (checked_exceptions_length > 0) {
1736 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1737 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1738 }
1740 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1741 *
1742 * Rules for LVT's and LVTT's are:
1743 * - There can be any number of LVT's and LVTT's.
1744 * - If there are n LVT's, it is the same as if there was just
1745 * one LVT containing all the entries from the n LVT's.
1746 * - There may be no more than one LVT entry per local variable.
1747 * Two LVT entries are 'equal' if these fields are the same:
1748 * start_pc, length, name, slot
1749 * - There may be no more than one LVTT entry per each LVT entry.
1750 * Each LVTT entry has to match some LVT entry.
1751 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1752 */
1753 if (total_lvt_length > 0) {
1754 int tbl_no, idx;
1756 promoted_flags->set_has_localvariable_table();
1758 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1759 initialize_hashtable(lvt_Hash);
1761 // To fill LocalVariableTable in
1762 Classfile_LVT_Element* cf_lvt;
1763 LocalVariableTableElement* lvt = m->localvariable_table_start();
1765 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1766 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1767 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1768 copy_lvt_element(&cf_lvt[idx], lvt);
1769 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1770 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1771 && _need_verify
1772 && _major_version >= JAVA_1_5_VERSION ) {
1773 clear_hashtable(lvt_Hash);
1774 classfile_parse_error("Duplicated LocalVariableTable attribute "
1775 "entry for '%s' in class file %s",
1776 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1777 CHECK_(nullHandle));
1778 }
1779 }
1780 }
1782 // To merge LocalVariableTable and LocalVariableTypeTable
1783 Classfile_LVT_Element* cf_lvtt;
1784 LocalVariableTableElement lvtt_elem;
1786 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1787 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1788 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1789 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1790 int index = hash(&lvtt_elem);
1791 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1792 if (entry == NULL) {
1793 if (_need_verify) {
1794 clear_hashtable(lvt_Hash);
1795 classfile_parse_error("LVTT entry for '%s' in class file %s "
1796 "does not match any LVT entry",
1797 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1798 CHECK_(nullHandle));
1799 }
1800 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1801 clear_hashtable(lvt_Hash);
1802 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1803 "entry for '%s' in class file %s",
1804 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1805 CHECK_(nullHandle));
1806 } else {
1807 // to add generic signatures into LocalVariableTable
1808 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1809 }
1810 }
1811 }
1812 clear_hashtable(lvt_Hash);
1813 }
1815 *method_annotations = assemble_annotations(runtime_visible_annotations,
1816 runtime_visible_annotations_length,
1817 runtime_invisible_annotations,
1818 runtime_invisible_annotations_length,
1819 CHECK_(nullHandle));
1820 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1821 runtime_visible_parameter_annotations_length,
1822 runtime_invisible_parameter_annotations,
1823 runtime_invisible_parameter_annotations_length,
1824 CHECK_(nullHandle));
1825 *method_default_annotations = assemble_annotations(annotation_default,
1826 annotation_default_length,
1827 NULL,
1828 0,
1829 CHECK_(nullHandle));
1831 if (name() == vmSymbols::finalize_method_name() &&
1832 signature() == vmSymbols::void_method_signature()) {
1833 if (m->is_empty_method()) {
1834 _has_empty_finalizer = true;
1835 } else {
1836 _has_finalizer = true;
1837 }
1838 }
1839 if (name() == vmSymbols::object_initializer_name() &&
1840 signature() == vmSymbols::void_method_signature() &&
1841 m->is_vanilla_constructor()) {
1842 _has_vanilla_constructor = true;
1843 }
1845 if (EnableMethodHandles && m->is_method_handle_invoke()) {
1846 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
1847 "Method handle invokers must be defined internally to the VM", nullHandle);
1848 }
1850 return m;
1851 }
1854 // The promoted_flags parameter is used to pass relevant access_flags
1855 // from the methods back up to the containing klass. These flag values
1856 // are added to klass's access_flags.
1858 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1859 AccessFlags* promoted_flags,
1860 bool* has_final_method,
1861 objArrayOop* methods_annotations_oop,
1862 objArrayOop* methods_parameter_annotations_oop,
1863 objArrayOop* methods_default_annotations_oop,
1864 TRAPS) {
1865 ClassFileStream* cfs = stream();
1866 objArrayHandle nullHandle;
1867 typeArrayHandle method_annotations;
1868 typeArrayHandle method_parameter_annotations;
1869 typeArrayHandle method_default_annotations;
1870 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1871 u2 length = cfs->get_u2_fast();
1872 if (length == 0) {
1873 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1874 } else {
1875 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1876 objArrayHandle methods(THREAD, m);
1877 HandleMark hm(THREAD);
1878 objArrayHandle methods_annotations;
1879 objArrayHandle methods_parameter_annotations;
1880 objArrayHandle methods_default_annotations;
1881 for (int index = 0; index < length; index++) {
1882 methodHandle method = parse_method(cp, is_interface,
1883 promoted_flags,
1884 &method_annotations,
1885 &method_parameter_annotations,
1886 &method_default_annotations,
1887 CHECK_(nullHandle));
1888 if (method->is_final()) {
1889 *has_final_method = true;
1890 }
1891 methods->obj_at_put(index, method());
1892 if (method_annotations.not_null()) {
1893 if (methods_annotations.is_null()) {
1894 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1895 methods_annotations = objArrayHandle(THREAD, md);
1896 }
1897 methods_annotations->obj_at_put(index, method_annotations());
1898 }
1899 if (method_parameter_annotations.not_null()) {
1900 if (methods_parameter_annotations.is_null()) {
1901 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1902 methods_parameter_annotations = objArrayHandle(THREAD, md);
1903 }
1904 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1905 }
1906 if (method_default_annotations.not_null()) {
1907 if (methods_default_annotations.is_null()) {
1908 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1909 methods_default_annotations = objArrayHandle(THREAD, md);
1910 }
1911 methods_default_annotations->obj_at_put(index, method_default_annotations());
1912 }
1913 }
1914 if (_need_verify && length > 1) {
1915 // Check duplicated methods
1916 ResourceMark rm(THREAD);
1917 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1918 THREAD, NameSigHash*, HASH_ROW_SIZE);
1919 initialize_hashtable(names_and_sigs);
1920 bool dup = false;
1921 {
1922 debug_only(No_Safepoint_Verifier nsv;)
1923 for (int i = 0; i < length; i++) {
1924 methodOop m = (methodOop)methods->obj_at(i);
1925 // If no duplicates, add name/signature in hashtable names_and_sigs.
1926 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1927 dup = true;
1928 break;
1929 }
1930 }
1931 }
1932 if (dup) {
1933 classfile_parse_error("Duplicate method name&signature in class file %s",
1934 CHECK_(nullHandle));
1935 }
1936 }
1938 *methods_annotations_oop = methods_annotations();
1939 *methods_parameter_annotations_oop = methods_parameter_annotations();
1940 *methods_default_annotations_oop = methods_default_annotations();
1942 return methods;
1943 }
1944 }
1947 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1948 objArrayHandle methods_annotations,
1949 objArrayHandle methods_parameter_annotations,
1950 objArrayHandle methods_default_annotations,
1951 TRAPS) {
1952 typeArrayHandle nullHandle;
1953 int length = methods()->length();
1954 // If JVMTI original method ordering is enabled we have to
1955 // remember the original class file ordering.
1956 // We temporarily use the vtable_index field in the methodOop to store the
1957 // class file index, so we can read in after calling qsort.
1958 if (JvmtiExport::can_maintain_original_method_order()) {
1959 for (int index = 0; index < length; index++) {
1960 methodOop m = methodOop(methods->obj_at(index));
1961 assert(!m->valid_vtable_index(), "vtable index should not be set");
1962 m->set_vtable_index(index);
1963 }
1964 }
1965 // Sort method array by ascending method name (for faster lookups & vtable construction)
1966 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1967 methodOopDesc::sort_methods(methods(),
1968 methods_annotations(),
1969 methods_parameter_annotations(),
1970 methods_default_annotations());
1972 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1973 if (JvmtiExport::can_maintain_original_method_order()) {
1974 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1975 typeArrayHandle method_ordering(THREAD, new_ordering);
1976 for (int index = 0; index < length; index++) {
1977 methodOop m = methodOop(methods->obj_at(index));
1978 int old_index = m->vtable_index();
1979 assert(old_index >= 0 && old_index < length, "invalid method index");
1980 method_ordering->int_at_put(index, old_index);
1981 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1982 }
1983 return method_ordering;
1984 } else {
1985 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1986 }
1987 }
1990 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1991 ClassFileStream* cfs = stream();
1992 cfs->guarantee_more(2, CHECK); // sourcefile_index
1993 u2 sourcefile_index = cfs->get_u2_fast();
1994 check_property(
1995 valid_cp_range(sourcefile_index, cp->length()) &&
1996 cp->tag_at(sourcefile_index).is_utf8(),
1997 "Invalid SourceFile attribute at constant pool index %u in class file %s",
1998 sourcefile_index, CHECK);
1999 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2000 }
2004 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2005 instanceKlassHandle k,
2006 int length, TRAPS) {
2007 ClassFileStream* cfs = stream();
2008 u1* sde_buffer = cfs->get_u1_buffer();
2009 assert(sde_buffer != NULL, "null sde buffer");
2011 // Don't bother storing it if there is no way to retrieve it
2012 if (JvmtiExport::can_get_source_debug_extension()) {
2013 // Optimistically assume that only 1 byte UTF format is used
2014 // (common case)
2015 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2016 length, CHECK);
2017 k->set_source_debug_extension(sde_symbol);
2018 }
2019 // Got utf8 string, set stream position forward
2020 cfs->skip_u1(length, CHECK);
2021 }
2024 // Inner classes can be static, private or protected (classic VM does this)
2025 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2027 // Return number of classes in the inner classes attribute table
2028 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2029 ClassFileStream* cfs = stream();
2030 cfs->guarantee_more(2, CHECK_0); // length
2031 u2 length = cfs->get_u2_fast();
2033 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2034 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2035 typeArrayHandle inner_classes(THREAD, ic);
2036 int index = 0;
2037 int cp_size = cp->length();
2038 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2039 for (int n = 0; n < length; n++) {
2040 // Inner class index
2041 u2 inner_class_info_index = cfs->get_u2_fast();
2042 check_property(
2043 inner_class_info_index == 0 ||
2044 (valid_cp_range(inner_class_info_index, cp_size) &&
2045 is_klass_reference(cp, inner_class_info_index)),
2046 "inner_class_info_index %u has bad constant type in class file %s",
2047 inner_class_info_index, CHECK_0);
2048 // Outer class index
2049 u2 outer_class_info_index = cfs->get_u2_fast();
2050 check_property(
2051 outer_class_info_index == 0 ||
2052 (valid_cp_range(outer_class_info_index, cp_size) &&
2053 is_klass_reference(cp, outer_class_info_index)),
2054 "outer_class_info_index %u has bad constant type in class file %s",
2055 outer_class_info_index, CHECK_0);
2056 // Inner class name
2057 u2 inner_name_index = cfs->get_u2_fast();
2058 check_property(
2059 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2060 cp->tag_at(inner_name_index).is_utf8()),
2061 "inner_name_index %u has bad constant type in class file %s",
2062 inner_name_index, CHECK_0);
2063 if (_need_verify) {
2064 guarantee_property(inner_class_info_index != outer_class_info_index,
2065 "Class is both outer and inner class in class file %s", CHECK_0);
2066 }
2067 // Access flags
2068 AccessFlags inner_access_flags;
2069 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2070 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2071 // Set abstract bit for old class files for backward compatibility
2072 flags |= JVM_ACC_ABSTRACT;
2073 }
2074 verify_legal_class_modifiers(flags, CHECK_0);
2075 inner_access_flags.set_flags(flags);
2077 inner_classes->short_at_put(index++, inner_class_info_index);
2078 inner_classes->short_at_put(index++, outer_class_info_index);
2079 inner_classes->short_at_put(index++, inner_name_index);
2080 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2081 }
2083 // 4347400: make sure there's no duplicate entry in the classes array
2084 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2085 for(int i = 0; i < inner_classes->length(); i += 4) {
2086 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2087 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2088 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2089 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2090 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2091 "Duplicate entry in InnerClasses in class file %s",
2092 CHECK_0);
2093 }
2094 }
2095 }
2097 // Update instanceKlass with inner class info.
2098 k->set_inner_classes(inner_classes());
2099 return length;
2100 }
2102 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2103 k->set_is_synthetic();
2104 }
2106 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2107 ClassFileStream* cfs = stream();
2108 u2 signature_index = cfs->get_u2(CHECK);
2109 check_property(
2110 valid_cp_range(signature_index, cp->length()) &&
2111 cp->tag_at(signature_index).is_utf8(),
2112 "Invalid constant pool index %u in Signature attribute in class file %s",
2113 signature_index, CHECK);
2114 k->set_generic_signature(cp->symbol_at(signature_index));
2115 }
2117 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2118 ClassFileStream* cfs = stream();
2119 // Set inner classes attribute to default sentinel
2120 k->set_inner_classes(Universe::the_empty_short_array());
2121 cfs->guarantee_more(2, CHECK); // attributes_count
2122 u2 attributes_count = cfs->get_u2_fast();
2123 bool parsed_sourcefile_attribute = false;
2124 bool parsed_innerclasses_attribute = false;
2125 bool parsed_enclosingmethod_attribute = false;
2126 u1* runtime_visible_annotations = NULL;
2127 int runtime_visible_annotations_length = 0;
2128 u1* runtime_invisible_annotations = NULL;
2129 int runtime_invisible_annotations_length = 0;
2130 // Iterate over attributes
2131 while (attributes_count--) {
2132 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2133 u2 attribute_name_index = cfs->get_u2_fast();
2134 u4 attribute_length = cfs->get_u4_fast();
2135 check_property(
2136 valid_cp_range(attribute_name_index, cp->length()) &&
2137 cp->tag_at(attribute_name_index).is_utf8(),
2138 "Attribute name has bad constant pool index %u in class file %s",
2139 attribute_name_index, CHECK);
2140 symbolOop tag = cp->symbol_at(attribute_name_index);
2141 if (tag == vmSymbols::tag_source_file()) {
2142 // Check for SourceFile tag
2143 if (_need_verify) {
2144 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2145 }
2146 if (parsed_sourcefile_attribute) {
2147 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2148 } else {
2149 parsed_sourcefile_attribute = true;
2150 }
2151 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2152 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2153 // Check for SourceDebugExtension tag
2154 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2155 } else if (tag == vmSymbols::tag_inner_classes()) {
2156 // Check for InnerClasses tag
2157 if (parsed_innerclasses_attribute) {
2158 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2159 } else {
2160 parsed_innerclasses_attribute = true;
2161 }
2162 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2163 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2164 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2165 "Wrong InnerClasses attribute length in class file %s", CHECK);
2166 }
2167 } else if (tag == vmSymbols::tag_synthetic()) {
2168 // Check for Synthetic tag
2169 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2170 if (attribute_length != 0) {
2171 classfile_parse_error(
2172 "Invalid Synthetic classfile attribute length %u in class file %s",
2173 attribute_length, CHECK);
2174 }
2175 parse_classfile_synthetic_attribute(cp, k, CHECK);
2176 } else if (tag == vmSymbols::tag_deprecated()) {
2177 // Check for Deprecatd tag - 4276120
2178 if (attribute_length != 0) {
2179 classfile_parse_error(
2180 "Invalid Deprecated classfile attribute length %u in class file %s",
2181 attribute_length, CHECK);
2182 }
2183 } else if (_major_version >= JAVA_1_5_VERSION) {
2184 if (tag == vmSymbols::tag_signature()) {
2185 if (attribute_length != 2) {
2186 classfile_parse_error(
2187 "Wrong Signature attribute length %u in class file %s",
2188 attribute_length, CHECK);
2189 }
2190 parse_classfile_signature_attribute(cp, k, CHECK);
2191 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2192 runtime_visible_annotations_length = attribute_length;
2193 runtime_visible_annotations = cfs->get_u1_buffer();
2194 assert(runtime_visible_annotations != NULL, "null visible annotations");
2195 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2196 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2197 runtime_invisible_annotations_length = attribute_length;
2198 runtime_invisible_annotations = cfs->get_u1_buffer();
2199 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2200 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2201 } else if (tag == vmSymbols::tag_enclosing_method()) {
2202 if (parsed_enclosingmethod_attribute) {
2203 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2204 } else {
2205 parsed_enclosingmethod_attribute = true;
2206 }
2207 cfs->guarantee_more(4, CHECK); // class_index, method_index
2208 u2 class_index = cfs->get_u2_fast();
2209 u2 method_index = cfs->get_u2_fast();
2210 if (class_index == 0) {
2211 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2212 }
2213 // Validate the constant pool indices and types
2214 if (!cp->is_within_bounds(class_index) ||
2215 !is_klass_reference(cp, class_index)) {
2216 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2217 }
2218 if (method_index != 0 &&
2219 (!cp->is_within_bounds(method_index) ||
2220 !cp->tag_at(method_index).is_name_and_type())) {
2221 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2222 }
2223 k->set_enclosing_method_indices(class_index, method_index);
2224 } else {
2225 // Unknown attribute
2226 cfs->skip_u1(attribute_length, CHECK);
2227 }
2228 } else {
2229 // Unknown attribute
2230 cfs->skip_u1(attribute_length, CHECK);
2231 }
2232 }
2233 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2234 runtime_visible_annotations_length,
2235 runtime_invisible_annotations,
2236 runtime_invisible_annotations_length,
2237 CHECK);
2238 k->set_class_annotations(annotations());
2239 }
2242 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2243 int runtime_visible_annotations_length,
2244 u1* runtime_invisible_annotations,
2245 int runtime_invisible_annotations_length, TRAPS) {
2246 typeArrayHandle annotations;
2247 if (runtime_visible_annotations != NULL ||
2248 runtime_invisible_annotations != NULL) {
2249 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2250 runtime_invisible_annotations_length, CHECK_(annotations));
2251 annotations = typeArrayHandle(THREAD, anno);
2252 if (runtime_visible_annotations != NULL) {
2253 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2254 }
2255 if (runtime_invisible_annotations != NULL) {
2256 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2257 }
2258 }
2259 return annotations;
2260 }
2263 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2264 KlassHandle h_k (THREAD, fd->field_holder());
2265 assert(h_k.not_null() && fd->is_static(), "just checking");
2266 if (fd->has_initial_value()) {
2267 BasicType t = fd->field_type();
2268 switch (t) {
2269 case T_BYTE:
2270 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2271 break;
2272 case T_BOOLEAN:
2273 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2274 break;
2275 case T_CHAR:
2276 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2277 break;
2278 case T_SHORT:
2279 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2280 break;
2281 case T_INT:
2282 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2283 break;
2284 case T_FLOAT:
2285 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2286 break;
2287 case T_DOUBLE:
2288 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2289 break;
2290 case T_LONG:
2291 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2292 break;
2293 case T_OBJECT:
2294 {
2295 #ifdef ASSERT
2296 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2297 assert(fd->signature() == sym, "just checking");
2298 #endif
2299 oop string = fd->string_initial_value(CHECK);
2300 h_k()->obj_field_put(fd->offset(), string);
2301 }
2302 break;
2303 default:
2304 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2305 "Illegal ConstantValue attribute in class file");
2306 }
2307 }
2308 }
2311 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2312 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2313 // This code is for compatibility with earlier jdk's that do not
2314 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2315 // the check for the "discovered" field should issue a warning if
2316 // the field is not found. For 1.6 this code should be issue a
2317 // fatal error if the "discovered" field is not found.
2318 //
2319 // Increment fac.nonstatic_oop_count so that the start of the
2320 // next type of non-static oops leaves room for the fake oop.
2321 // Do not increment next_nonstatic_oop_offset so that the
2322 // fake oop is place after the java.lang.ref.Reference oop
2323 // fields.
2324 //
2325 // Check the fields in java.lang.ref.Reference for the "discovered"
2326 // field. If it is not present, artifically create a field for it.
2327 // This allows this VM to run on early JDK where the field is not
2328 // present.
2330 //
2331 // Increment fac.nonstatic_oop_count so that the start of the
2332 // next type of non-static oops leaves room for the fake oop.
2333 // Do not increment next_nonstatic_oop_offset so that the
2334 // fake oop is place after the java.lang.ref.Reference oop
2335 // fields.
2336 //
2337 // Check the fields in java.lang.ref.Reference for the "discovered"
2338 // field. If it is not present, artifically create a field for it.
2339 // This allows this VM to run on early JDK where the field is not
2340 // present.
2341 int reference_sig_index = 0;
2342 int reference_name_index = 0;
2343 int reference_index = 0;
2344 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2345 const int n = (*fields_ptr)()->length();
2346 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2347 int name_index =
2348 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2349 int sig_index =
2350 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2351 symbolOop f_name = cp->symbol_at(name_index);
2352 symbolOop f_sig = cp->symbol_at(sig_index);
2353 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2354 // Save the index for reference signature for later use.
2355 // The fake discovered field does not entries in the
2356 // constant pool so the index for its signature cannot
2357 // be extracted from the constant pool. It will need
2358 // later, however. It's signature is vmSymbols::reference_signature()
2359 // so same an index for that signature.
2360 reference_sig_index = sig_index;
2361 reference_name_index = name_index;
2362 reference_index = i;
2363 }
2364 if (f_name == vmSymbols::reference_discovered_name() &&
2365 f_sig == vmSymbols::reference_signature()) {
2366 // The values below are fake but will force extra
2367 // non-static oop fields and a corresponding non-static
2368 // oop map block to be allocated.
2369 extra = 0;
2370 break;
2371 }
2372 }
2373 if (extra != 0) {
2374 fac_ptr->nonstatic_oop_count += extra;
2375 // Add the additional entry to "fields" so that the klass
2376 // contains the "discoverd" field and the field will be initialized
2377 // in instances of the object.
2378 int fields_with_fix_length = (*fields_ptr)()->length() +
2379 instanceKlass::next_offset;
2380 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2381 fields_with_fix_length, CHECK);
2382 typeArrayHandle fields_with_fix(THREAD, ff);
2384 // Take everything from the original but the length.
2385 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2386 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2387 }
2389 // Add the fake field at the end.
2390 int i = (*fields_ptr)->length();
2391 // There is no name index for the fake "discovered" field nor
2392 // signature but a signature is needed so that the field will
2393 // be properly initialized. Use one found for
2394 // one of the other reference fields. Be sure the index for the
2395 // name is 0. In fieldDescriptor::initialize() the index of the
2396 // name is checked. That check is by passed for the last nonstatic
2397 // oop field in a java.lang.ref.Reference which is assumed to be
2398 // this artificial "discovered" field. An assertion checks that
2399 // the name index is 0.
2400 assert(reference_index != 0, "Missing signature for reference");
2402 int j;
2403 for (j = 0; j < instanceKlass::next_offset; j++) {
2404 fields_with_fix->ushort_at_put(i + j,
2405 (*fields_ptr)->ushort_at(reference_index +j));
2406 }
2407 // Clear the public access flag and set the private access flag.
2408 short flags;
2409 flags =
2410 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2411 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2412 flags = flags & (~JVM_ACC_PUBLIC);
2413 flags = flags | JVM_ACC_PRIVATE;
2414 AccessFlags access_flags;
2415 access_flags.set_flags(flags);
2416 assert(!access_flags.is_public(), "Failed to clear public flag");
2417 assert(access_flags.is_private(), "Failed to set private flag");
2418 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2419 flags);
2421 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2422 == reference_name_index, "The fake reference name is incorrect");
2423 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2424 == reference_sig_index, "The fake reference signature is incorrect");
2425 // The type of the field is stored in the low_offset entry during
2426 // parsing.
2427 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2428 NONSTATIC_OOP, "The fake reference type is incorrect");
2430 // "fields" is allocated in the permanent generation. Disgard
2431 // it and let it be collected.
2432 (*fields_ptr) = fields_with_fix;
2433 }
2434 return;
2435 }
2438 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2439 FieldAllocationCount *fac_ptr, TRAPS) {
2440 // Add fake fields for java.lang.Class instances
2441 //
2442 // This is not particularly nice. We should consider adding a
2443 // private transient object field at the Java level to
2444 // java.lang.Class. Alternatively we could add a subclass of
2445 // instanceKlass which provides an accessor and size computer for
2446 // this field, but that appears to be more code than this hack.
2447 //
2448 // NOTE that we wedge these in at the beginning rather than the
2449 // end of the object because the Class layout changed between JDK
2450 // 1.3 and JDK 1.4 with the new reflection implementation; some
2451 // nonstatic oop fields were added at the Java level. The offsets
2452 // of these fake fields can't change between these two JDK
2453 // versions because when the offsets are computed at bootstrap
2454 // time we don't know yet which version of the JDK we're running in.
2456 // The values below are fake but will force two non-static oop fields and
2457 // a corresponding non-static oop map block to be allocated.
2458 const int extra = java_lang_Class::number_of_fake_oop_fields;
2459 fac_ptr->nonstatic_oop_count += extra;
2460 }
2463 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2464 // Cause the extra fake fields in java.lang.Class to show up before
2465 // the Java fields for layout compatibility between 1.3 and 1.4
2466 // Incrementing next_nonstatic_oop_offset here advances the
2467 // location where the real java fields are placed.
2468 const int extra = java_lang_Class::number_of_fake_oop_fields;
2469 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2470 }
2473 // Force MethodHandle.vmentry to be an unmanaged pointer.
2474 // There is no way for a classfile to express this, so we must help it.
2475 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2476 typeArrayHandle* fields_ptr,
2477 FieldAllocationCount *fac_ptr,
2478 TRAPS) {
2479 // Add fake fields for java.dyn.MethodHandle instances
2480 //
2481 // This is not particularly nice, but since there is no way to express
2482 // a native wordSize field in Java, we must do it at this level.
2484 if (!EnableMethodHandles) return;
2486 int word_sig_index = 0;
2487 const int cp_size = cp->length();
2488 for (int index = 1; index < cp_size; index++) {
2489 if (cp->tag_at(index).is_utf8() &&
2490 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2491 word_sig_index = index;
2492 break;
2493 }
2494 }
2496 if (word_sig_index == 0)
2497 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2498 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2500 bool found_vmentry = false;
2502 const int n = (*fields_ptr)()->length();
2503 for (int i = 0; i < n; i += instanceKlass::next_offset) {
2504 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2505 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2506 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2507 symbolOop f_name = cp->symbol_at(name_index);
2508 symbolOop f_sig = cp->symbol_at(sig_index);
2509 if (f_sig == vmSymbols::byte_signature() &&
2510 f_name == vmSymbols::vmentry_name() &&
2511 (acc_flags & JVM_ACC_STATIC) == 0) {
2512 // Adjust the field type from byte to an unmanaged pointer.
2513 assert(fac_ptr->nonstatic_byte_count > 0, "");
2514 fac_ptr->nonstatic_byte_count -= 1;
2515 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset,
2516 word_sig_index);
2517 if (wordSize == jintSize) {
2518 fac_ptr->nonstatic_word_count += 1;
2519 } else {
2520 fac_ptr->nonstatic_double_count += 1;
2521 }
2523 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i+4);
2524 assert(atype == NONSTATIC_BYTE, "");
2525 FieldAllocationType new_atype = NONSTATIC_WORD;
2526 if (wordSize > jintSize) {
2527 if (Universe::field_type_should_be_aligned(T_LONG)) {
2528 atype = NONSTATIC_ALIGNED_DOUBLE;
2529 } else {
2530 atype = NONSTATIC_DOUBLE;
2531 }
2532 }
2533 (*fields_ptr)->ushort_at_put(i+4, new_atype);
2535 found_vmentry = true;
2536 break;
2537 }
2538 }
2540 if (!found_vmentry)
2541 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2542 "missing vmentry byte field in java.dyn.MethodHandle");
2544 }
2547 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2548 Handle class_loader,
2549 Handle protection_domain,
2550 KlassHandle host_klass,
2551 GrowableArray<Handle>* cp_patches,
2552 symbolHandle& parsed_name,
2553 TRAPS) {
2554 // So that JVMTI can cache class file in the state before retransformable agents
2555 // have modified it
2556 unsigned char *cached_class_file_bytes = NULL;
2557 jint cached_class_file_length;
2559 ClassFileStream* cfs = stream();
2560 // Timing
2561 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time());
2563 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2565 if (JvmtiExport::should_post_class_file_load_hook()) {
2566 unsigned char* ptr = cfs->buffer();
2567 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2569 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2570 &ptr, &end_ptr,
2571 &cached_class_file_bytes,
2572 &cached_class_file_length);
2574 if (ptr != cfs->buffer()) {
2575 // JVMTI agent has modified class file data.
2576 // Set new class file stream using JVMTI agent modified
2577 // class file data.
2578 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2579 set_stream(cfs);
2580 }
2581 }
2583 _host_klass = host_klass;
2584 _cp_patches = cp_patches;
2586 instanceKlassHandle nullHandle;
2588 // Figure out whether we can skip format checking (matching classic VM behavior)
2589 _need_verify = Verifier::should_verify_for(class_loader());
2591 // Set the verify flag in stream
2592 cfs->set_verify(_need_verify);
2594 // Save the class file name for easier error message printing.
2595 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2597 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2598 // Magic value
2599 u4 magic = cfs->get_u4_fast();
2600 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2601 "Incompatible magic value %u in class file %s",
2602 magic, CHECK_(nullHandle));
2604 // Version numbers
2605 u2 minor_version = cfs->get_u2_fast();
2606 u2 major_version = cfs->get_u2_fast();
2608 // Check version numbers - we check this even with verifier off
2609 if (!is_supported_version(major_version, minor_version)) {
2610 if (name.is_null()) {
2611 Exceptions::fthrow(
2612 THREAD_AND_LOCATION,
2613 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2614 "Unsupported major.minor version %u.%u",
2615 major_version,
2616 minor_version);
2617 } else {
2618 ResourceMark rm(THREAD);
2619 Exceptions::fthrow(
2620 THREAD_AND_LOCATION,
2621 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2622 "%s : Unsupported major.minor version %u.%u",
2623 name->as_C_string(),
2624 major_version,
2625 minor_version);
2626 }
2627 return nullHandle;
2628 }
2630 _major_version = major_version;
2631 _minor_version = minor_version;
2634 // Check if verification needs to be relaxed for this class file
2635 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2636 _relax_verify = Verifier::relax_verify_for(class_loader());
2638 // Constant pool
2639 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2640 int cp_size = cp->length();
2642 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2644 // Access flags
2645 AccessFlags access_flags;
2646 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2648 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2649 // Set abstract bit for old class files for backward compatibility
2650 flags |= JVM_ACC_ABSTRACT;
2651 }
2652 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2653 access_flags.set_flags(flags);
2655 // This class and superclass
2656 instanceKlassHandle super_klass;
2657 u2 this_class_index = cfs->get_u2_fast();
2658 check_property(
2659 valid_cp_range(this_class_index, cp_size) &&
2660 cp->tag_at(this_class_index).is_unresolved_klass(),
2661 "Invalid this class index %u in constant pool in class file %s",
2662 this_class_index, CHECK_(nullHandle));
2664 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2665 assert(class_name.not_null(), "class_name can't be null");
2667 // It's important to set parsed_name *before* resolving the super class.
2668 // (it's used for cleanup by the caller if parsing fails)
2669 parsed_name = class_name;
2671 // Update _class_name which could be null previously to be class_name
2672 _class_name = class_name;
2674 // Don't need to check whether this class name is legal or not.
2675 // It has been checked when constant pool is parsed.
2676 // However, make sure it is not an array type.
2677 if (_need_verify) {
2678 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2679 "Bad class name in class file %s",
2680 CHECK_(nullHandle));
2681 }
2683 klassOop preserve_this_klass; // for storing result across HandleMark
2685 // release all handles when parsing is done
2686 { HandleMark hm(THREAD);
2688 // Checks if name in class file matches requested name
2689 if (name.not_null() && class_name() != name()) {
2690 ResourceMark rm(THREAD);
2691 Exceptions::fthrow(
2692 THREAD_AND_LOCATION,
2693 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2694 "%s (wrong name: %s)",
2695 name->as_C_string(),
2696 class_name->as_C_string()
2697 );
2698 return nullHandle;
2699 }
2701 if (TraceClassLoadingPreorder) {
2702 tty->print("[Loading %s", name()->as_klass_external_name());
2703 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2704 tty->print_cr("]");
2705 }
2707 u2 super_class_index = cfs->get_u2_fast();
2708 if (super_class_index == 0) {
2709 check_property(class_name() == vmSymbols::java_lang_Object(),
2710 "Invalid superclass index %u in class file %s",
2711 super_class_index,
2712 CHECK_(nullHandle));
2713 } else {
2714 check_property(valid_cp_range(super_class_index, cp_size) &&
2715 is_klass_reference(cp, super_class_index),
2716 "Invalid superclass index %u in class file %s",
2717 super_class_index,
2718 CHECK_(nullHandle));
2719 // The class name should be legal because it is checked when parsing constant pool.
2720 // However, make sure it is not an array type.
2721 bool is_array = false;
2722 if (cp->tag_at(super_class_index).is_klass()) {
2723 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2724 if (_need_verify)
2725 is_array = super_klass->oop_is_array();
2726 } else if (_need_verify) {
2727 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2728 }
2729 if (_need_verify) {
2730 guarantee_property(!is_array,
2731 "Bad superclass name in class file %s", CHECK_(nullHandle));
2732 }
2733 }
2735 // Interfaces
2736 u2 itfs_len = cfs->get_u2_fast();
2737 objArrayHandle local_interfaces;
2738 if (itfs_len == 0) {
2739 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2740 } else {
2741 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle));
2742 }
2744 // Fields (offsets are filled in later)
2745 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2746 objArrayHandle fields_annotations;
2747 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2748 // Methods
2749 bool has_final_method = false;
2750 AccessFlags promoted_flags;
2751 promoted_flags.set_flags(0);
2752 // These need to be oop pointers because they are allocated lazily
2753 // inside parse_methods inside a nested HandleMark
2754 objArrayOop methods_annotations_oop = NULL;
2755 objArrayOop methods_parameter_annotations_oop = NULL;
2756 objArrayOop methods_default_annotations_oop = NULL;
2757 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2758 &promoted_flags,
2759 &has_final_method,
2760 &methods_annotations_oop,
2761 &methods_parameter_annotations_oop,
2762 &methods_default_annotations_oop,
2763 CHECK_(nullHandle));
2765 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2766 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2767 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2769 // We check super class after class file is parsed and format is checked
2770 if (super_class_index > 0 && super_klass.is_null()) {
2771 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2772 if (access_flags.is_interface()) {
2773 // Before attempting to resolve the superclass, check for class format
2774 // errors not checked yet.
2775 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2776 "Interfaces must have java.lang.Object as superclass in class file %s",
2777 CHECK_(nullHandle));
2778 }
2779 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2780 sk,
2781 class_loader,
2782 protection_domain,
2783 true,
2784 CHECK_(nullHandle));
2785 KlassHandle kh (THREAD, k);
2786 super_klass = instanceKlassHandle(THREAD, kh());
2787 if (LinkWellKnownClasses) // my super class is well known to me
2788 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2789 }
2790 if (super_klass.not_null()) {
2791 if (super_klass->is_interface()) {
2792 ResourceMark rm(THREAD);
2793 Exceptions::fthrow(
2794 THREAD_AND_LOCATION,
2795 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2796 "class %s has interface %s as super class",
2797 class_name->as_klass_external_name(),
2798 super_klass->external_name()
2799 );
2800 return nullHandle;
2801 }
2802 // Make sure super class is not final
2803 if (super_klass->is_final()) {
2804 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2805 }
2806 }
2808 // Compute the transitive list of all unique interfaces implemented by this class
2809 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2811 // sort methods
2812 typeArrayHandle method_ordering = sort_methods(methods,
2813 methods_annotations,
2814 methods_parameter_annotations,
2815 methods_default_annotations,
2816 CHECK_(nullHandle));
2818 // promote flags from parse_methods() to the klass' flags
2819 access_flags.add_promoted_flags(promoted_flags.as_int());
2821 // Size of Java vtable (in words)
2822 int vtable_size = 0;
2823 int itable_size = 0;
2824 int num_miranda_methods = 0;
2826 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2827 num_miranda_methods,
2828 super_klass(),
2829 methods(),
2830 access_flags,
2831 class_loader,
2832 class_name,
2833 local_interfaces(),
2834 CHECK_(nullHandle));
2836 // Size of Java itable (in words)
2837 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2839 // Field size and offset computation
2840 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2841 #ifndef PRODUCT
2842 int orig_nonstatic_field_size = 0;
2843 #endif
2844 int static_field_size = 0;
2845 int next_static_oop_offset;
2846 int next_static_double_offset;
2847 int next_static_word_offset;
2848 int next_static_short_offset;
2849 int next_static_byte_offset;
2850 int next_static_type_offset;
2851 int next_nonstatic_oop_offset;
2852 int next_nonstatic_double_offset;
2853 int next_nonstatic_word_offset;
2854 int next_nonstatic_short_offset;
2855 int next_nonstatic_byte_offset;
2856 int next_nonstatic_type_offset;
2857 int first_nonstatic_oop_offset;
2858 int first_nonstatic_field_offset;
2859 int next_nonstatic_field_offset;
2861 // Calculate the starting byte offsets
2862 next_static_oop_offset = (instanceKlass::header_size() +
2863 align_object_offset(vtable_size) +
2864 align_object_offset(itable_size)) * wordSize;
2865 next_static_double_offset = next_static_oop_offset +
2866 (fac.static_oop_count * heapOopSize);
2867 if ( fac.static_double_count &&
2868 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2869 Universe::field_type_should_be_aligned(T_LONG)) ) {
2870 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2871 }
2873 next_static_word_offset = next_static_double_offset +
2874 (fac.static_double_count * BytesPerLong);
2875 next_static_short_offset = next_static_word_offset +
2876 (fac.static_word_count * BytesPerInt);
2877 next_static_byte_offset = next_static_short_offset +
2878 (fac.static_short_count * BytesPerShort);
2879 next_static_type_offset = align_size_up((next_static_byte_offset +
2880 fac.static_byte_count ), wordSize );
2881 static_field_size = (next_static_type_offset -
2882 next_static_oop_offset) / wordSize;
2883 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
2884 nonstatic_field_size * heapOopSize;
2885 next_nonstatic_field_offset = first_nonstatic_field_offset;
2887 // Add fake fields for java.lang.Class instances (also see below)
2888 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2889 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2890 }
2892 // adjust the vmentry field declaration in java.dyn.MethodHandle
2893 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
2894 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
2895 }
2897 // Add a fake "discovered" field if it is not present
2898 // for compatibility with earlier jdk's.
2899 if (class_name() == vmSymbols::java_lang_ref_Reference()
2900 && class_loader.is_null()) {
2901 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2902 }
2903 // end of "discovered" field compactibility fix
2905 int nonstatic_double_count = fac.nonstatic_double_count;
2906 int nonstatic_word_count = fac.nonstatic_word_count;
2907 int nonstatic_short_count = fac.nonstatic_short_count;
2908 int nonstatic_byte_count = fac.nonstatic_byte_count;
2909 int nonstatic_oop_count = fac.nonstatic_oop_count;
2911 bool super_has_nonstatic_fields =
2912 (super_klass() != NULL && super_klass->has_nonstatic_fields());
2913 bool has_nonstatic_fields = super_has_nonstatic_fields ||
2914 ((nonstatic_double_count + nonstatic_word_count +
2915 nonstatic_short_count + nonstatic_byte_count +
2916 nonstatic_oop_count) != 0);
2919 // Prepare list of oops for oop maps generation.
2920 u2* nonstatic_oop_offsets;
2921 u2* nonstatic_oop_length;
2922 int nonstatic_oop_map_count = 0;
2924 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2925 THREAD, u2, nonstatic_oop_count+1);
2926 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2927 THREAD, u2, nonstatic_oop_count+1);
2929 // Add fake fields for java.lang.Class instances (also see above).
2930 // FieldsAllocationStyle and CompactFields values will be reset to default.
2931 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2932 java_lang_Class_fix_post(&next_nonstatic_field_offset);
2933 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset;
2934 int fake_oop_count = (( next_nonstatic_field_offset -
2935 first_nonstatic_field_offset ) / heapOopSize);
2936 nonstatic_oop_length [0] = (u2)fake_oop_count;
2937 nonstatic_oop_map_count = 1;
2938 nonstatic_oop_count -= fake_oop_count;
2939 first_nonstatic_oop_offset = first_nonstatic_field_offset;
2940 } else {
2941 first_nonstatic_oop_offset = 0; // will be set for first oop field
2942 }
2944 #ifndef PRODUCT
2945 if( PrintCompactFieldsSavings ) {
2946 next_nonstatic_double_offset = next_nonstatic_field_offset +
2947 (nonstatic_oop_count * heapOopSize);
2948 if ( nonstatic_double_count > 0 ) {
2949 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2950 }
2951 next_nonstatic_word_offset = next_nonstatic_double_offset +
2952 (nonstatic_double_count * BytesPerLong);
2953 next_nonstatic_short_offset = next_nonstatic_word_offset +
2954 (nonstatic_word_count * BytesPerInt);
2955 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2956 (nonstatic_short_count * BytesPerShort);
2957 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
2958 nonstatic_byte_count ), heapOopSize );
2959 orig_nonstatic_field_size = nonstatic_field_size +
2960 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
2961 }
2962 #endif
2963 bool compact_fields = CompactFields;
2964 int allocation_style = FieldsAllocationStyle;
2965 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range?
2966 assert(false, "0 <= FieldsAllocationStyle <= 1");
2967 allocation_style = 1; // Optimistic
2968 }
2970 // The next classes have predefined hard-coded fields offsets
2971 // (see in JavaClasses::compute_hard_coded_offsets()).
2972 // Use default fields allocation order for them.
2973 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2974 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2975 class_name() == vmSymbols::java_lang_Class() ||
2976 class_name() == vmSymbols::java_lang_ClassLoader() ||
2977 class_name() == vmSymbols::java_lang_ref_Reference() ||
2978 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2979 class_name() == vmSymbols::java_lang_StackTraceElement() ||
2980 class_name() == vmSymbols::java_lang_String() ||
2981 class_name() == vmSymbols::java_lang_Throwable() ||
2982 class_name() == vmSymbols::java_lang_Boolean() ||
2983 class_name() == vmSymbols::java_lang_Character() ||
2984 class_name() == vmSymbols::java_lang_Float() ||
2985 class_name() == vmSymbols::java_lang_Double() ||
2986 class_name() == vmSymbols::java_lang_Byte() ||
2987 class_name() == vmSymbols::java_lang_Short() ||
2988 class_name() == vmSymbols::java_lang_Integer() ||
2989 class_name() == vmSymbols::java_lang_Long())) {
2990 allocation_style = 0; // Allocate oops first
2991 compact_fields = false; // Don't compact fields
2992 }
2994 if( allocation_style == 0 ) {
2995 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2996 next_nonstatic_oop_offset = next_nonstatic_field_offset;
2997 next_nonstatic_double_offset = next_nonstatic_oop_offset +
2998 (nonstatic_oop_count * heapOopSize);
2999 } else if( allocation_style == 1 ) {
3000 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3001 next_nonstatic_double_offset = next_nonstatic_field_offset;
3002 } else {
3003 ShouldNotReachHere();
3004 }
3006 int nonstatic_oop_space_count = 0;
3007 int nonstatic_word_space_count = 0;
3008 int nonstatic_short_space_count = 0;
3009 int nonstatic_byte_space_count = 0;
3010 int nonstatic_oop_space_offset;
3011 int nonstatic_word_space_offset;
3012 int nonstatic_short_space_offset;
3013 int nonstatic_byte_space_offset;
3015 if( nonstatic_double_count > 0 ) {
3016 int offset = next_nonstatic_double_offset;
3017 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3018 if( compact_fields && offset != next_nonstatic_double_offset ) {
3019 // Allocate available fields into the gap before double field.
3020 int length = next_nonstatic_double_offset - offset;
3021 assert(length == BytesPerInt, "");
3022 nonstatic_word_space_offset = offset;
3023 if( nonstatic_word_count > 0 ) {
3024 nonstatic_word_count -= 1;
3025 nonstatic_word_space_count = 1; // Only one will fit
3026 length -= BytesPerInt;
3027 offset += BytesPerInt;
3028 }
3029 nonstatic_short_space_offset = offset;
3030 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3031 nonstatic_short_count -= 1;
3032 nonstatic_short_space_count += 1;
3033 length -= BytesPerShort;
3034 offset += BytesPerShort;
3035 }
3036 nonstatic_byte_space_offset = offset;
3037 while( length > 0 && nonstatic_byte_count > 0 ) {
3038 nonstatic_byte_count -= 1;
3039 nonstatic_byte_space_count += 1;
3040 length -= 1;
3041 }
3042 // Allocate oop field in the gap if there are no other fields for that.
3043 nonstatic_oop_space_offset = offset;
3044 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3045 allocation_style != 0 ) { // when oop fields not first
3046 nonstatic_oop_count -= 1;
3047 nonstatic_oop_space_count = 1; // Only one will fit
3048 length -= heapOopSize;
3049 offset += heapOopSize;
3050 }
3051 }
3052 }
3054 next_nonstatic_word_offset = next_nonstatic_double_offset +
3055 (nonstatic_double_count * BytesPerLong);
3056 next_nonstatic_short_offset = next_nonstatic_word_offset +
3057 (nonstatic_word_count * BytesPerInt);
3058 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3059 (nonstatic_short_count * BytesPerShort);
3061 int notaligned_offset;
3062 if( allocation_style == 0 ) {
3063 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3064 } else { // allocation_style == 1
3065 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3066 if( nonstatic_oop_count > 0 ) {
3067 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3068 }
3069 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3070 }
3071 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3072 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3073 - first_nonstatic_field_offset)/heapOopSize);
3075 // Iterate over fields again and compute correct offsets.
3076 // The field allocation type was temporarily stored in the offset slot.
3077 // oop fields are located before non-oop fields (static and non-static).
3078 int len = fields->length();
3079 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3080 int real_offset;
3081 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4);
3082 switch (atype) {
3083 case STATIC_OOP:
3084 real_offset = next_static_oop_offset;
3085 next_static_oop_offset += heapOopSize;
3086 break;
3087 case STATIC_BYTE:
3088 real_offset = next_static_byte_offset;
3089 next_static_byte_offset += 1;
3090 break;
3091 case STATIC_SHORT:
3092 real_offset = next_static_short_offset;
3093 next_static_short_offset += BytesPerShort;
3094 break;
3095 case STATIC_WORD:
3096 real_offset = next_static_word_offset;
3097 next_static_word_offset += BytesPerInt;
3098 break;
3099 case STATIC_ALIGNED_DOUBLE:
3100 case STATIC_DOUBLE:
3101 real_offset = next_static_double_offset;
3102 next_static_double_offset += BytesPerLong;
3103 break;
3104 case NONSTATIC_OOP:
3105 if( nonstatic_oop_space_count > 0 ) {
3106 real_offset = nonstatic_oop_space_offset;
3107 nonstatic_oop_space_offset += heapOopSize;
3108 nonstatic_oop_space_count -= 1;
3109 } else {
3110 real_offset = next_nonstatic_oop_offset;
3111 next_nonstatic_oop_offset += heapOopSize;
3112 }
3113 // Update oop maps
3114 if( nonstatic_oop_map_count > 0 &&
3115 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3116 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * heapOopSize) ) {
3117 // Extend current oop map
3118 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1;
3119 } else {
3120 // Create new oop map
3121 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset;
3122 nonstatic_oop_length [nonstatic_oop_map_count] = 1;
3123 nonstatic_oop_map_count += 1;
3124 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3125 first_nonstatic_oop_offset = real_offset;
3126 }
3127 }
3128 break;
3129 case NONSTATIC_BYTE:
3130 if( nonstatic_byte_space_count > 0 ) {
3131 real_offset = nonstatic_byte_space_offset;
3132 nonstatic_byte_space_offset += 1;
3133 nonstatic_byte_space_count -= 1;
3134 } else {
3135 real_offset = next_nonstatic_byte_offset;
3136 next_nonstatic_byte_offset += 1;
3137 }
3138 break;
3139 case NONSTATIC_SHORT:
3140 if( nonstatic_short_space_count > 0 ) {
3141 real_offset = nonstatic_short_space_offset;
3142 nonstatic_short_space_offset += BytesPerShort;
3143 nonstatic_short_space_count -= 1;
3144 } else {
3145 real_offset = next_nonstatic_short_offset;
3146 next_nonstatic_short_offset += BytesPerShort;
3147 }
3148 break;
3149 case NONSTATIC_WORD:
3150 if( nonstatic_word_space_count > 0 ) {
3151 real_offset = nonstatic_word_space_offset;
3152 nonstatic_word_space_offset += BytesPerInt;
3153 nonstatic_word_space_count -= 1;
3154 } else {
3155 real_offset = next_nonstatic_word_offset;
3156 next_nonstatic_word_offset += BytesPerInt;
3157 }
3158 break;
3159 case NONSTATIC_ALIGNED_DOUBLE:
3160 case NONSTATIC_DOUBLE:
3161 real_offset = next_nonstatic_double_offset;
3162 next_nonstatic_double_offset += BytesPerLong;
3163 break;
3164 default:
3165 ShouldNotReachHere();
3166 }
3167 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) );
3168 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) );
3169 }
3171 // Size of instances
3172 int instance_size;
3174 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3175 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3177 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3179 // Size of non-static oop map blocks (in words) allocated at end of klass
3180 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset);
3182 // Compute reference type
3183 ReferenceType rt;
3184 if (super_klass() == NULL) {
3185 rt = REF_NONE;
3186 } else {
3187 rt = super_klass->reference_type();
3188 }
3190 // We can now create the basic klassOop for this klass
3191 klassOop ik = oopFactory::new_instanceKlass(
3192 vtable_size, itable_size,
3193 static_field_size, nonstatic_oop_map_size,
3194 rt, CHECK_(nullHandle));
3195 instanceKlassHandle this_klass (THREAD, ik);
3197 assert(this_klass->static_field_size() == static_field_size &&
3198 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check");
3200 // Fill in information already parsed
3201 this_klass->set_access_flags(access_flags);
3202 jint lh = Klass::instance_layout_helper(instance_size, false);
3203 this_klass->set_layout_helper(lh);
3204 assert(this_klass->oop_is_instance(), "layout is correct");
3205 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3206 // Not yet: supers are done below to support the new subtype-checking fields
3207 //this_klass->set_super(super_klass());
3208 this_klass->set_class_loader(class_loader());
3209 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3210 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3211 this_klass->set_static_oop_field_size(fac.static_oop_count);
3212 cp->set_pool_holder(this_klass());
3213 this_klass->set_constants(cp());
3214 this_klass->set_local_interfaces(local_interfaces());
3215 this_klass->set_fields(fields());
3216 this_klass->set_methods(methods());
3217 if (has_final_method) {
3218 this_klass->set_has_final_method();
3219 }
3220 this_klass->set_method_ordering(method_ordering());
3221 this_klass->set_initial_method_idnum(methods->length());
3222 this_klass->set_name(cp->klass_name_at(this_class_index));
3223 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3224 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3225 this_klass->set_protection_domain(protection_domain());
3226 this_klass->set_fields_annotations(fields_annotations());
3227 this_klass->set_methods_annotations(methods_annotations());
3228 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3229 this_klass->set_methods_default_annotations(methods_default_annotations());
3231 this_klass->set_minor_version(minor_version);
3232 this_klass->set_major_version(major_version);
3234 if (cached_class_file_bytes != NULL) {
3235 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3236 this_klass->set_cached_class_file(cached_class_file_bytes,
3237 cached_class_file_length);
3238 }
3240 // Miranda methods
3241 if ((num_miranda_methods > 0) ||
3242 // if this class introduced new miranda methods or
3243 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3244 // super class exists and this class inherited miranda methods
3245 ) {
3246 this_klass->set_has_miranda_methods(); // then set a flag
3247 }
3249 // Additional attributes
3250 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3252 // Make sure this is the end of class file stream
3253 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3255 // Initialize static fields
3256 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3258 // VerifyOops believes that once this has been set, the object is completely loaded.
3259 // Compute transitive closure of interfaces this class implements
3260 this_klass->set_transitive_interfaces(transitive_interfaces());
3262 // Fill in information needed to compute superclasses.
3263 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3265 // Initialize itable offset tables
3266 klassItable::setup_itable_offset_table(this_klass);
3268 // Do final class setup
3269 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length);
3271 set_precomputed_flags(this_klass);
3273 // reinitialize modifiers, using the InnerClasses attribute
3274 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3275 this_klass->set_modifier_flags(computed_modifiers);
3277 // check if this class can access its super class
3278 check_super_class_access(this_klass, CHECK_(nullHandle));
3280 // check if this class can access its superinterfaces
3281 check_super_interface_access(this_klass, CHECK_(nullHandle));
3283 // check if this class overrides any final method
3284 check_final_method_override(this_klass, CHECK_(nullHandle));
3286 // check that if this class is an interface then it doesn't have static methods
3287 if (this_klass->is_interface()) {
3288 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3289 }
3291 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3292 false /* not shared class */);
3294 if (TraceClassLoading) {
3295 // print in a single call to reduce interleaving of output
3296 if (cfs->source() != NULL) {
3297 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3298 cfs->source());
3299 } else if (class_loader.is_null()) {
3300 if (THREAD->is_Java_thread()) {
3301 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3302 tty->print("[Loaded %s by instance of %s]\n",
3303 this_klass->external_name(),
3304 instanceKlass::cast(caller)->external_name());
3305 } else {
3306 tty->print("[Loaded %s]\n", this_klass->external_name());
3307 }
3308 } else {
3309 ResourceMark rm;
3310 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3311 instanceKlass::cast(class_loader->klass())->external_name());
3312 }
3313 }
3315 if (TraceClassResolution) {
3316 // print out the superclass.
3317 const char * from = Klass::cast(this_klass())->external_name();
3318 if (this_klass->java_super() != NULL) {
3319 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3320 }
3321 // print out each of the interface classes referred to by this class.
3322 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3323 if (!local_interfaces.is_null()) {
3324 int length = local_interfaces->length();
3325 for (int i = 0; i < length; i++) {
3326 klassOop k = klassOop(local_interfaces->obj_at(i));
3327 instanceKlass* to_class = instanceKlass::cast(k);
3328 const char * to = to_class->external_name();
3329 tty->print("RESOLVE %s %s (interface)\n", from, to);
3330 }
3331 }
3332 }
3334 #ifndef PRODUCT
3335 if( PrintCompactFieldsSavings ) {
3336 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3337 tty->print("[Saved %d of %d bytes in %s]\n",
3338 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3339 orig_nonstatic_field_size*heapOopSize,
3340 this_klass->external_name());
3341 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3342 tty->print("[Wasted %d over %d bytes in %s]\n",
3343 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3344 orig_nonstatic_field_size*heapOopSize,
3345 this_klass->external_name());
3346 }
3347 }
3348 #endif
3350 // preserve result across HandleMark
3351 preserve_this_klass = this_klass();
3352 }
3354 // Create new handle outside HandleMark
3355 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3356 debug_only(this_klass->as_klassOop()->verify();)
3358 return this_klass;
3359 }
3362 int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) {
3363 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size();
3364 if (nonstatic_oop_map_count > 0) {
3365 // We have oops to add to map
3366 if (map_size == 0) {
3367 map_size = nonstatic_oop_map_count;
3368 } else {
3369 // Check whether we should add a new map block or whether the last one can be extended
3370 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps();
3371 OopMapBlock* last_map = first_map + map_size - 1;
3373 int next_offset = last_map->offset() + (last_map->length() * heapOopSize);
3374 if (next_offset == first_nonstatic_oop_offset) {
3375 // There is no gap bettwen superklass's last oop field and first
3376 // local oop field, merge maps.
3377 nonstatic_oop_map_count -= 1;
3378 } else {
3379 // Superklass didn't end with a oop field, add extra maps
3380 assert(next_offset<first_nonstatic_oop_offset, "just checking");
3381 }
3382 map_size += nonstatic_oop_map_count;
3383 }
3384 }
3385 return map_size;
3386 }
3389 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3390 int nonstatic_oop_map_count,
3391 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) {
3392 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3393 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size();
3394 instanceKlass* super = k->superklass();
3395 if (super != NULL) {
3396 int super_oop_map_size = super->nonstatic_oop_map_size();
3397 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3398 // Copy maps from superklass
3399 while (super_oop_map_size-- > 0) {
3400 *this_oop_map++ = *super_oop_map++;
3401 }
3402 }
3403 if (nonstatic_oop_map_count > 0) {
3404 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) {
3405 // Calculated in compute_oop_map_size() number of oop maps is less then
3406 // collected oop maps since there is no gap between superklass's last oop
3407 // field and first local oop field. Extend the last oop map copied
3408 // from the superklass instead of creating new one.
3409 nonstatic_oop_map_count--;
3410 nonstatic_oop_offsets++;
3411 this_oop_map--;
3412 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++);
3413 this_oop_map++;
3414 }
3415 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking");
3416 // Add new map blocks, fill them
3417 while (nonstatic_oop_map_count-- > 0) {
3418 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3419 this_oop_map->set_length(*nonstatic_oop_length++);
3420 this_oop_map++;
3421 }
3422 }
3423 }
3426 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3427 klassOop super = k->super();
3429 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3430 // in which case we don't have to register objects as finalizable
3431 if (!_has_empty_finalizer) {
3432 if (_has_finalizer ||
3433 (super != NULL && super->klass_part()->has_finalizer())) {
3434 k->set_has_finalizer();
3435 }
3436 }
3438 #ifdef ASSERT
3439 bool f = false;
3440 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3441 vmSymbols::void_method_signature());
3442 if (m != NULL && !m->is_empty_method()) {
3443 f = true;
3444 }
3445 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3446 #endif
3448 // Check if this klass supports the java.lang.Cloneable interface
3449 if (SystemDictionary::cloneable_klass_loaded()) {
3450 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) {
3451 k->set_is_cloneable();
3452 }
3453 }
3455 // Check if this klass has a vanilla default constructor
3456 if (super == NULL) {
3457 // java.lang.Object has empty default constructor
3458 k->set_has_vanilla_constructor();
3459 } else {
3460 if (Klass::cast(super)->has_vanilla_constructor() &&
3461 _has_vanilla_constructor) {
3462 k->set_has_vanilla_constructor();
3463 }
3464 #ifdef ASSERT
3465 bool v = false;
3466 if (Klass::cast(super)->has_vanilla_constructor()) {
3467 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3468 ), vmSymbols::void_method_signature());
3469 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3470 v = true;
3471 }
3472 }
3473 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3474 #endif
3475 }
3477 // If it cannot be fast-path allocated, set a bit in the layout helper.
3478 // See documentation of instanceKlass::can_be_fastpath_allocated().
3479 assert(k->size_helper() > 0, "layout_helper is initialized");
3480 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3481 || k->is_abstract() || k->is_interface()
3482 || (k->name() == vmSymbols::java_lang_Class()
3483 && k->class_loader() == NULL)
3484 || k->size_helper() >= FastAllocateSizeLimit) {
3485 // Forbid fast-path allocation.
3486 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3487 k->set_layout_helper(lh);
3488 }
3489 }
3492 // utility method for appending and array with check for duplicates
3494 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3495 // iterate over new interfaces
3496 for (int i = 0; i < ifs->length(); i++) {
3497 oop e = ifs->obj_at(i);
3498 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3499 // check for duplicates
3500 bool duplicate = false;
3501 for (int j = 0; j < index; j++) {
3502 if (result->obj_at(j) == e) {
3503 duplicate = true;
3504 break;
3505 }
3506 }
3507 // add new interface
3508 if (!duplicate) {
3509 result->obj_at_put(index++, e);
3510 }
3511 }
3512 }
3514 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3515 // Compute maximum size for transitive interfaces
3516 int max_transitive_size = 0;
3517 int super_size = 0;
3518 // Add superclass transitive interfaces size
3519 if (super.not_null()) {
3520 super_size = super->transitive_interfaces()->length();
3521 max_transitive_size += super_size;
3522 }
3523 // Add local interfaces' super interfaces
3524 int local_size = local_ifs->length();
3525 for (int i = 0; i < local_size; i++) {
3526 klassOop l = klassOop(local_ifs->obj_at(i));
3527 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3528 }
3529 // Finally add local interfaces
3530 max_transitive_size += local_size;
3531 // Construct array
3532 objArrayHandle result;
3533 if (max_transitive_size == 0) {
3534 // no interfaces, use canonicalized array
3535 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3536 } else if (max_transitive_size == super_size) {
3537 // no new local interfaces added, share superklass' transitive interface array
3538 result = objArrayHandle(THREAD, super->transitive_interfaces());
3539 } else if (max_transitive_size == local_size) {
3540 // only local interfaces added, share local interface array
3541 result = local_ifs;
3542 } else {
3543 objArrayHandle nullHandle;
3544 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3545 result = objArrayHandle(THREAD, new_objarray);
3546 int index = 0;
3547 // Copy down from superclass
3548 if (super.not_null()) {
3549 append_interfaces(result, index, super->transitive_interfaces());
3550 }
3551 // Copy down from local interfaces' superinterfaces
3552 for (int i = 0; i < local_ifs->length(); i++) {
3553 klassOop l = klassOop(local_ifs->obj_at(i));
3554 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3555 }
3556 // Finally add local interfaces
3557 append_interfaces(result, index, local_ifs());
3559 // Check if duplicates were removed
3560 if (index != max_transitive_size) {
3561 assert(index < max_transitive_size, "just checking");
3562 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3563 for (int i = 0; i < index; i++) {
3564 oop e = result->obj_at(i);
3565 assert(e != NULL, "just checking");
3566 new_result->obj_at_put(i, e);
3567 }
3568 result = objArrayHandle(THREAD, new_result);
3569 }
3570 }
3571 return result;
3572 }
3575 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3576 klassOop super = this_klass->super();
3577 if ((super != NULL) &&
3578 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3579 ResourceMark rm(THREAD);
3580 Exceptions::fthrow(
3581 THREAD_AND_LOCATION,
3582 vmSymbolHandles::java_lang_IllegalAccessError(),
3583 "class %s cannot access its superclass %s",
3584 this_klass->external_name(),
3585 instanceKlass::cast(super)->external_name()
3586 );
3587 return;
3588 }
3589 }
3592 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3593 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3594 int lng = local_interfaces->length();
3595 for (int i = lng - 1; i >= 0; i--) {
3596 klassOop k = klassOop(local_interfaces->obj_at(i));
3597 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3598 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3599 ResourceMark rm(THREAD);
3600 Exceptions::fthrow(
3601 THREAD_AND_LOCATION,
3602 vmSymbolHandles::java_lang_IllegalAccessError(),
3603 "class %s cannot access its superinterface %s",
3604 this_klass->external_name(),
3605 instanceKlass::cast(k)->external_name()
3606 );
3607 return;
3608 }
3609 }
3610 }
3613 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3614 objArrayHandle methods (THREAD, this_klass->methods());
3615 int num_methods = methods->length();
3617 // go thru each method and check if it overrides a final method
3618 for (int index = 0; index < num_methods; index++) {
3619 methodOop m = (methodOop)methods->obj_at(index);
3621 // skip private, static and <init> methods
3622 if ((!m->is_private()) &&
3623 (!m->is_static()) &&
3624 (m->name() != vmSymbols::object_initializer_name())) {
3626 symbolOop name = m->name();
3627 symbolOop signature = m->signature();
3628 klassOop k = this_klass->super();
3629 methodOop super_m = NULL;
3630 while (k != NULL) {
3631 // skip supers that don't have final methods.
3632 if (k->klass_part()->has_final_method()) {
3633 // lookup a matching method in the super class hierarchy
3634 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3635 if (super_m == NULL) {
3636 break; // didn't find any match; get out
3637 }
3639 if (super_m->is_final() &&
3640 // matching method in super is final
3641 (Reflection::verify_field_access(this_klass->as_klassOop(),
3642 super_m->method_holder(),
3643 super_m->method_holder(),
3644 super_m->access_flags(), false))
3645 // this class can access super final method and therefore override
3646 ) {
3647 ResourceMark rm(THREAD);
3648 Exceptions::fthrow(
3649 THREAD_AND_LOCATION,
3650 vmSymbolHandles::java_lang_VerifyError(),
3651 "class %s overrides final method %s.%s",
3652 this_klass->external_name(),
3653 name->as_C_string(),
3654 signature->as_C_string()
3655 );
3656 return;
3657 }
3659 // continue to look from super_m's holder's super.
3660 k = instanceKlass::cast(super_m->method_holder())->super();
3661 continue;
3662 }
3664 k = k->klass_part()->super();
3665 }
3666 }
3667 }
3668 }
3671 // assumes that this_klass is an interface
3672 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3673 assert(this_klass->is_interface(), "not an interface");
3674 objArrayHandle methods (THREAD, this_klass->methods());
3675 int num_methods = methods->length();
3677 for (int index = 0; index < num_methods; index++) {
3678 methodOop m = (methodOop)methods->obj_at(index);
3679 // if m is static and not the init method, throw a verify error
3680 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3681 ResourceMark rm(THREAD);
3682 Exceptions::fthrow(
3683 THREAD_AND_LOCATION,
3684 vmSymbolHandles::java_lang_VerifyError(),
3685 "Illegal static method %s in interface %s",
3686 m->name()->as_C_string(),
3687 this_klass->external_name()
3688 );
3689 return;
3690 }
3691 }
3692 }
3694 // utility methods for format checking
3696 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3697 if (!_need_verify) { return; }
3699 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3700 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3701 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3702 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3703 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3704 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3705 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3707 if ((is_abstract && is_final) ||
3708 (is_interface && !is_abstract) ||
3709 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3710 (!is_interface && major_gte_15 && is_annotation)) {
3711 ResourceMark rm(THREAD);
3712 Exceptions::fthrow(
3713 THREAD_AND_LOCATION,
3714 vmSymbolHandles::java_lang_ClassFormatError(),
3715 "Illegal class modifiers in class %s: 0x%X",
3716 _class_name->as_C_string(), flags
3717 );
3718 return;
3719 }
3720 }
3722 bool ClassFileParser::has_illegal_visibility(jint flags) {
3723 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3724 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3725 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3727 return ((is_public && is_protected) ||
3728 (is_public && is_private) ||
3729 (is_protected && is_private));
3730 }
3732 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3733 u2 max_version = JDK_Version::is_gte_jdk17x_version() ?
3734 JAVA_MAX_SUPPORTED_VERSION : JAVA_6_VERSION;
3735 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3736 (major <= max_version) &&
3737 ((major != max_version) ||
3738 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3739 }
3741 void ClassFileParser::verify_legal_field_modifiers(
3742 jint flags, bool is_interface, TRAPS) {
3743 if (!_need_verify) { return; }
3745 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3746 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3747 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3748 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3749 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3750 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3751 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3752 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3753 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3755 bool is_illegal = false;
3757 if (is_interface) {
3758 if (!is_public || !is_static || !is_final || is_private ||
3759 is_protected || is_volatile || is_transient ||
3760 (major_gte_15 && is_enum)) {
3761 is_illegal = true;
3762 }
3763 } else { // not interface
3764 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3765 is_illegal = true;
3766 }
3767 }
3769 if (is_illegal) {
3770 ResourceMark rm(THREAD);
3771 Exceptions::fthrow(
3772 THREAD_AND_LOCATION,
3773 vmSymbolHandles::java_lang_ClassFormatError(),
3774 "Illegal field modifiers in class %s: 0x%X",
3775 _class_name->as_C_string(), flags);
3776 return;
3777 }
3778 }
3780 void ClassFileParser::verify_legal_method_modifiers(
3781 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3782 if (!_need_verify) { return; }
3784 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3785 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3786 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3787 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3788 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3789 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3790 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3791 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3792 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3793 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3794 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3796 bool is_illegal = false;
3798 if (is_interface) {
3799 if (!is_abstract || !is_public || is_static || is_final ||
3800 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3801 is_illegal = true;
3802 }
3803 } else { // not interface
3804 if (is_initializer) {
3805 if (is_static || is_final || is_synchronized || is_native ||
3806 is_abstract || (major_gte_15 && is_bridge)) {
3807 is_illegal = true;
3808 }
3809 } else { // not initializer
3810 if (is_abstract) {
3811 if ((is_final || is_native || is_private || is_static ||
3812 (major_gte_15 && (is_synchronized || is_strict)))) {
3813 is_illegal = true;
3814 }
3815 }
3816 if (has_illegal_visibility(flags)) {
3817 is_illegal = true;
3818 }
3819 }
3820 }
3822 if (is_illegal) {
3823 ResourceMark rm(THREAD);
3824 Exceptions::fthrow(
3825 THREAD_AND_LOCATION,
3826 vmSymbolHandles::java_lang_ClassFormatError(),
3827 "Method %s in class %s has illegal modifiers: 0x%X",
3828 name->as_C_string(), _class_name->as_C_string(), flags);
3829 return;
3830 }
3831 }
3833 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3834 assert(_need_verify, "only called when _need_verify is true");
3835 int i = 0;
3836 int count = length >> 2;
3837 for (int k=0; k<count; k++) {
3838 unsigned char b0 = buffer[i];
3839 unsigned char b1 = buffer[i+1];
3840 unsigned char b2 = buffer[i+2];
3841 unsigned char b3 = buffer[i+3];
3842 // For an unsigned char v,
3843 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3844 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3845 unsigned char res = b0 | b0 - 1 |
3846 b1 | b1 - 1 |
3847 b2 | b2 - 1 |
3848 b3 | b3 - 1;
3849 if (res >= 128) break;
3850 i += 4;
3851 }
3852 for(; i < length; i++) {
3853 unsigned short c;
3854 // no embedded zeros
3855 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3856 if(buffer[i] < 128) {
3857 continue;
3858 }
3859 if ((i + 5) < length) { // see if it's legal supplementary character
3860 if (UTF8::is_supplementary_character(&buffer[i])) {
3861 c = UTF8::get_supplementary_character(&buffer[i]);
3862 i += 5;
3863 continue;
3864 }
3865 }
3866 switch (buffer[i] >> 4) {
3867 default: break;
3868 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3869 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3870 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
3871 c = (buffer[i] & 0x1F) << 6;
3872 i++;
3873 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3874 c += buffer[i] & 0x3F;
3875 if (_major_version <= 47 || c == 0 || c >= 0x80) {
3876 // for classes with major > 47, c must a null or a character in its shortest form
3877 break;
3878 }
3879 }
3880 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3881 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
3882 c = (buffer[i] & 0xF) << 12;
3883 i += 2;
3884 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3885 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3886 if (_major_version <= 47 || c >= 0x800) {
3887 // for classes with major > 47, c must be in its shortest form
3888 break;
3889 }
3890 }
3891 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3892 } // end of switch
3893 } // end of for
3894 }
3896 // Checks if name is a legal class name.
3897 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3898 if (!_need_verify || _relax_verify) { return; }
3900 char buf[fixed_buffer_size];
3901 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3902 unsigned int length = name->utf8_length();
3903 bool legal = false;
3905 if (length > 0) {
3906 char* p;
3907 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3908 p = skip_over_field_signature(bytes, false, length, CHECK);
3909 legal = (p != NULL) && ((p - bytes) == (int)length);
3910 } else if (_major_version < JAVA_1_5_VERSION) {
3911 if (bytes[0] != '<') {
3912 p = skip_over_field_name(bytes, true, length);
3913 legal = (p != NULL) && ((p - bytes) == (int)length);
3914 }
3915 } else {
3916 // 4900761: relax the constraints based on JSR202 spec
3917 // Class names may be drawn from the entire Unicode character set.
3918 // Identifiers between '/' must be unqualified names.
3919 // The utf8 string has been verified when parsing cpool entries.
3920 legal = verify_unqualified_name(bytes, length, LegalClass);
3921 }
3922 }
3923 if (!legal) {
3924 ResourceMark rm(THREAD);
3925 Exceptions::fthrow(
3926 THREAD_AND_LOCATION,
3927 vmSymbolHandles::java_lang_ClassFormatError(),
3928 "Illegal class name \"%s\" in class file %s", bytes,
3929 _class_name->as_C_string()
3930 );
3931 return;
3932 }
3933 }
3935 // Checks if name is a legal field name.
3936 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3937 if (!_need_verify || _relax_verify) { return; }
3939 char buf[fixed_buffer_size];
3940 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3941 unsigned int length = name->utf8_length();
3942 bool legal = false;
3944 if (length > 0) {
3945 if (_major_version < JAVA_1_5_VERSION) {
3946 if (bytes[0] != '<') {
3947 char* p = skip_over_field_name(bytes, false, length);
3948 legal = (p != NULL) && ((p - bytes) == (int)length);
3949 }
3950 } else {
3951 // 4881221: relax the constraints based on JSR202 spec
3952 legal = verify_unqualified_name(bytes, length, LegalField);
3953 }
3954 }
3956 if (!legal) {
3957 ResourceMark rm(THREAD);
3958 Exceptions::fthrow(
3959 THREAD_AND_LOCATION,
3960 vmSymbolHandles::java_lang_ClassFormatError(),
3961 "Illegal field name \"%s\" in class %s", bytes,
3962 _class_name->as_C_string()
3963 );
3964 return;
3965 }
3966 }
3968 // Checks if name is a legal method name.
3969 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
3970 if (!_need_verify || _relax_verify) { return; }
3972 assert(!name.is_null(), "method name is null");
3973 char buf[fixed_buffer_size];
3974 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3975 unsigned int length = name->utf8_length();
3976 bool legal = false;
3978 if (length > 0) {
3979 if (bytes[0] == '<') {
3980 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
3981 legal = true;
3982 }
3983 } else if (_major_version < JAVA_1_5_VERSION) {
3984 char* p;
3985 p = skip_over_field_name(bytes, false, length);
3986 legal = (p != NULL) && ((p - bytes) == (int)length);
3987 } else {
3988 // 4881221: relax the constraints based on JSR202 spec
3989 legal = verify_unqualified_name(bytes, length, LegalMethod);
3990 }
3991 }
3993 if (!legal) {
3994 ResourceMark rm(THREAD);
3995 Exceptions::fthrow(
3996 THREAD_AND_LOCATION,
3997 vmSymbolHandles::java_lang_ClassFormatError(),
3998 "Illegal method name \"%s\" in class %s", bytes,
3999 _class_name->as_C_string()
4000 );
4001 return;
4002 }
4003 }
4006 // Checks if signature is a legal field signature.
4007 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4008 if (!_need_verify) { return; }
4010 char buf[fixed_buffer_size];
4011 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4012 unsigned int length = signature->utf8_length();
4013 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4015 if (p == NULL || (p - bytes) != (int)length) {
4016 ResourceMark rm(THREAD);
4017 Exceptions::fthrow(
4018 THREAD_AND_LOCATION,
4019 vmSymbolHandles::java_lang_ClassFormatError(),
4020 "Field \"%s\" in class %s has illegal signature \"%s\"",
4021 name->as_C_string(), _class_name->as_C_string(), bytes
4022 );
4023 return;
4024 }
4025 }
4027 // Checks if signature is a legal method signature.
4028 // Returns number of parameters
4029 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4030 if (!_need_verify) {
4031 // make sure caller's args_size will be less than 0 even for non-static
4032 // method so it will be recomputed in compute_size_of_parameters().
4033 return -2;
4034 }
4036 unsigned int args_size = 0;
4037 char buf[fixed_buffer_size];
4038 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4039 unsigned int length = signature->utf8_length();
4040 char* nextp;
4042 // The first character must be a '('
4043 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4044 length--;
4045 // Skip over legal field signatures
4046 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4047 while ((length > 0) && (nextp != NULL)) {
4048 args_size++;
4049 if (p[0] == 'J' || p[0] == 'D') {
4050 args_size++;
4051 }
4052 length -= nextp - p;
4053 p = nextp;
4054 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4055 }
4056 // The first non-signature thing better be a ')'
4057 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4058 length--;
4059 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4060 // All internal methods must return void
4061 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4062 return args_size;
4063 }
4064 } else {
4065 // Now we better just have a return value
4066 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4067 if (nextp && ((int)length == (nextp - p))) {
4068 return args_size;
4069 }
4070 }
4071 }
4072 }
4073 // Report error
4074 ResourceMark rm(THREAD);
4075 Exceptions::fthrow(
4076 THREAD_AND_LOCATION,
4077 vmSymbolHandles::java_lang_ClassFormatError(),
4078 "Method \"%s\" in class %s has illegal signature \"%s\"",
4079 name->as_C_string(), _class_name->as_C_string(), p
4080 );
4081 return 0;
4082 }
4085 // Unqualified names may not contain the characters '.', ';', or '/'.
4086 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
4087 // Note that method names may not be <init> or <clinit> in this method.
4088 // Because these names have been checked as special cases before calling this method
4089 // in verify_legal_method_name.
4090 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
4091 jchar ch;
4093 for (char* p = name; p != name + length; ) {
4094 ch = *p;
4095 if (ch < 128) {
4096 p++;
4097 if (ch == '.' || ch == ';') {
4098 return false; // do not permit '.' or ';'
4099 }
4100 if (type != LegalClass && ch == '/') {
4101 return false; // do not permit '/' unless it's class name
4102 }
4103 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4104 return false; // do not permit '<' or '>' in method names
4105 }
4106 } else {
4107 char* tmp_p = UTF8::next(p, &ch);
4108 p = tmp_p;
4109 }
4110 }
4111 return true;
4112 }
4115 // Take pointer to a string. Skip over the longest part of the string that could
4116 // be taken as a fieldname. Allow '/' if slash_ok is true.
4117 // Return a pointer to just past the fieldname.
4118 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4119 // being true, we saw consecutive slashes (meaning we were looking for a
4120 // qualified path but found something that was badly-formed).
4121 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4122 char* p;
4123 jchar ch;
4124 jboolean last_is_slash = false;
4125 jboolean not_first_ch = false;
4127 for (p = name; p != name + length; not_first_ch = true) {
4128 char* old_p = p;
4129 ch = *p;
4130 if (ch < 128) {
4131 p++;
4132 // quick check for ascii
4133 if ((ch >= 'a' && ch <= 'z') ||
4134 (ch >= 'A' && ch <= 'Z') ||
4135 (ch == '_' || ch == '$') ||
4136 (not_first_ch && ch >= '0' && ch <= '9')) {
4137 last_is_slash = false;
4138 continue;
4139 }
4140 if (slash_ok && ch == '/') {
4141 if (last_is_slash) {
4142 return NULL; // Don't permit consecutive slashes
4143 }
4144 last_is_slash = true;
4145 continue;
4146 }
4147 } else {
4148 jint unicode_ch;
4149 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4150 p = tmp_p;
4151 last_is_slash = false;
4152 // Check if ch is Java identifier start or is Java identifier part
4153 // 4672820: call java.lang.Character methods directly without generating separate tables.
4154 EXCEPTION_MARK;
4155 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass());
4157 // return value
4158 JavaValue result(T_BOOLEAN);
4159 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4160 JavaCallArguments args;
4161 args.push_int(unicode_ch);
4163 // public static boolean isJavaIdentifierStart(char ch);
4164 JavaCalls::call_static(&result,
4165 klass,
4166 vmSymbolHandles::isJavaIdentifierStart_name(),
4167 vmSymbolHandles::int_bool_signature(),
4168 &args,
4169 THREAD);
4171 if (HAS_PENDING_EXCEPTION) {
4172 CLEAR_PENDING_EXCEPTION;
4173 return 0;
4174 }
4175 if (result.get_jboolean()) {
4176 continue;
4177 }
4179 if (not_first_ch) {
4180 // public static boolean isJavaIdentifierPart(char ch);
4181 JavaCalls::call_static(&result,
4182 klass,
4183 vmSymbolHandles::isJavaIdentifierPart_name(),
4184 vmSymbolHandles::int_bool_signature(),
4185 &args,
4186 THREAD);
4188 if (HAS_PENDING_EXCEPTION) {
4189 CLEAR_PENDING_EXCEPTION;
4190 return 0;
4191 }
4193 if (result.get_jboolean()) {
4194 continue;
4195 }
4196 }
4197 }
4198 return (not_first_ch) ? old_p : NULL;
4199 }
4200 return (not_first_ch) ? p : NULL;
4201 }
4204 // Take pointer to a string. Skip over the longest part of the string that could
4205 // be taken as a field signature. Allow "void" if void_ok.
4206 // Return a pointer to just past the signature.
4207 // Return NULL if no legal signature is found.
4208 char* ClassFileParser::skip_over_field_signature(char* signature,
4209 bool void_ok,
4210 unsigned int length,
4211 TRAPS) {
4212 unsigned int array_dim = 0;
4213 while (length > 0) {
4214 switch (signature[0]) {
4215 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4216 case JVM_SIGNATURE_BOOLEAN:
4217 case JVM_SIGNATURE_BYTE:
4218 case JVM_SIGNATURE_CHAR:
4219 case JVM_SIGNATURE_SHORT:
4220 case JVM_SIGNATURE_INT:
4221 case JVM_SIGNATURE_FLOAT:
4222 case JVM_SIGNATURE_LONG:
4223 case JVM_SIGNATURE_DOUBLE:
4224 return signature + 1;
4225 case JVM_SIGNATURE_CLASS: {
4226 if (_major_version < JAVA_1_5_VERSION) {
4227 // Skip over the class name if one is there
4228 char* p = skip_over_field_name(signature + 1, true, --length);
4230 // The next character better be a semicolon
4231 if (p && (p - signature) > 1 && p[0] == ';') {
4232 return p + 1;
4233 }
4234 } else {
4235 // 4900761: For class version > 48, any unicode is allowed in class name.
4236 length--;
4237 signature++;
4238 while (length > 0 && signature[0] != ';') {
4239 if (signature[0] == '.') {
4240 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4241 }
4242 length--;
4243 signature++;
4244 }
4245 if (signature[0] == ';') { return signature + 1; }
4246 }
4248 return NULL;
4249 }
4250 case JVM_SIGNATURE_ARRAY:
4251 array_dim++;
4252 if (array_dim > 255) {
4253 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4254 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4255 }
4256 // The rest of what's there better be a legal signature
4257 signature++;
4258 length--;
4259 void_ok = false;
4260 break;
4262 default:
4263 return NULL;
4264 }
4265 }
4266 return NULL;
4267 }
