Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/classfile/classFileParser.cpp@c18cbe5936b8
src/share/vm/classfile/classFileParser.cpp
Thu, 27 May 2010 19:08:38 -0700
- author
- trims
- date
- Thu, 27 May 2010 19:08:38 -0700
- changeset 1907
- c18cbe5936b8
- parent 1868
- df736661d0c8
- child 1944
- 3a9de63b2209
- child 1957
- 136b78722a08
- permissions
- -rw-r--r--
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
1 /*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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 fatal(err_msg("bad constant pool tag value %u",
338 cp->tag_at(index).value()));
339 ShouldNotReachHere();
340 break;
341 } // end of switch
342 } // end of for
344 if (_cp_patches != NULL) {
345 // need to treat this_class specially...
346 assert(AnonymousClasses, "");
347 int this_class_index;
348 {
349 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
350 u1* mark = cfs->current();
351 u2 flags = cfs->get_u2_fast();
352 this_class_index = cfs->get_u2_fast();
353 cfs->set_current(mark); // revert to mark
354 }
356 for (index = 1; index < length; index++) { // Index 0 is unused
357 if (has_cp_patch_at(index)) {
358 guarantee_property(index != this_class_index,
359 "Illegal constant pool patch to self at %d in class file %s",
360 index, CHECK_(nullHandle));
361 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
362 }
363 }
364 // Ensure that all the patches have been used.
365 for (index = 0; index < _cp_patches->length(); index++) {
366 guarantee_property(!has_cp_patch_at(index),
367 "Unused constant pool patch at %d in class file %s",
368 index, CHECK_(nullHandle));
369 }
370 }
372 if (!_need_verify) {
373 return cp;
374 }
376 // second verification pass - checks the strings are of the right format.
377 // but not yet to the other entries
378 for (index = 1; index < length; index++) {
379 jbyte tag = cp->tag_at(index).value();
380 switch (tag) {
381 case JVM_CONSTANT_UnresolvedClass: {
382 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
383 // check the name, even if _cp_patches will overwrite it
384 verify_legal_class_name(class_name, CHECK_(nullHandle));
385 break;
386 }
387 case JVM_CONSTANT_Fieldref:
388 case JVM_CONSTANT_Methodref:
389 case JVM_CONSTANT_InterfaceMethodref: {
390 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
391 // already verified to be utf8
392 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
393 // already verified to be utf8
394 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
395 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
396 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
397 if (tag == JVM_CONSTANT_Fieldref) {
398 verify_legal_field_name(name, CHECK_(nullHandle));
399 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
400 } else {
401 verify_legal_method_name(name, CHECK_(nullHandle));
402 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
403 if (tag == JVM_CONSTANT_Methodref) {
404 // 4509014: If a class method name begins with '<', it must be "<init>".
405 assert(!name.is_null(), "method name in constant pool is null");
406 unsigned int name_len = name->utf8_length();
407 assert(name_len > 0, "bad method name"); // already verified as legal name
408 if (name->byte_at(0) == '<') {
409 if (name() != vmSymbols::object_initializer_name()) {
410 classfile_parse_error(
411 "Bad method name at constant pool index %u in class file %s",
412 name_ref_index, CHECK_(nullHandle));
413 }
414 }
415 }
416 }
417 break;
418 }
419 } // end of switch
420 } // end of for
422 return cp;
423 }
426 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
427 assert(AnonymousClasses, "");
428 BasicType patch_type = T_VOID;
429 switch (cp->tag_at(index).value()) {
431 case JVM_CONSTANT_UnresolvedClass :
432 // Patching a class means pre-resolving it.
433 // The name in the constant pool is ignored.
434 if (patch->klass() == SystemDictionary::Class_klass()) { // %%% java_lang_Class::is_instance
435 guarantee_property(!java_lang_Class::is_primitive(patch()),
436 "Illegal class patch at %d in class file %s",
437 index, CHECK);
438 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
439 } else {
440 guarantee_property(java_lang_String::is_instance(patch()),
441 "Illegal class patch at %d in class file %s",
442 index, CHECK);
443 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
444 cp->unresolved_klass_at_put(index, name());
445 }
446 break;
448 case JVM_CONSTANT_UnresolvedString :
449 // Patching a string means pre-resolving it.
450 // The spelling in the constant pool is ignored.
451 // The constant reference may be any object whatever.
452 // If it is not a real interned string, the constant is referred
453 // to as a "pseudo-string", and must be presented to the CP
454 // explicitly, because it may require scavenging.
455 cp->pseudo_string_at_put(index, patch());
456 break;
458 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
459 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
460 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
461 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
462 patch_prim:
463 {
464 jvalue value;
465 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
466 guarantee_property(value_type == patch_type,
467 "Illegal primitive patch at %d in class file %s",
468 index, CHECK);
469 switch (value_type) {
470 case T_INT: cp->int_at_put(index, value.i); break;
471 case T_FLOAT: cp->float_at_put(index, value.f); break;
472 case T_LONG: cp->long_at_put(index, value.j); break;
473 case T_DOUBLE: cp->double_at_put(index, value.d); break;
474 default: assert(false, "");
475 }
476 }
477 break;
479 default:
480 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
481 guarantee_property(!has_cp_patch_at(index),
482 "Illegal unexpected patch at %d in class file %s",
483 index, CHECK);
484 return;
485 }
487 // On fall-through, mark the patch as used.
488 clear_cp_patch_at(index);
489 }
493 class NameSigHash: public ResourceObj {
494 public:
495 symbolOop _name; // name
496 symbolOop _sig; // signature
497 NameSigHash* _next; // Next entry in hash table
498 };
501 #define HASH_ROW_SIZE 256
503 unsigned int hash(symbolOop name, symbolOop sig) {
504 unsigned int raw_hash = 0;
505 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
506 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
508 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
509 }
512 void initialize_hashtable(NameSigHash** table) {
513 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
514 }
516 // Return false if the name/sig combination is found in table.
517 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
518 // The old format checker uses heap sort to find duplicates.
519 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
520 // of table since we don't expect symbolOop's to move.
521 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
522 assert(name != NULL, "name in constant pool is NULL");
524 // First lookup for duplicates
525 int index = hash(name, sig);
526 NameSigHash* entry = table[index];
527 while (entry != NULL) {
528 if (entry->_name == name && entry->_sig == sig) {
529 return false;
530 }
531 entry = entry->_next;
532 }
534 // No duplicate is found, allocate a new entry and fill it.
535 entry = new NameSigHash();
536 entry->_name = name;
537 entry->_sig = sig;
539 // Insert into hash table
540 entry->_next = table[index];
541 table[index] = entry;
543 return true;
544 }
547 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
548 int length,
549 Handle class_loader,
550 Handle protection_domain,
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 // Call resolve_super so classcircularity is checked
579 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
580 unresolved_klass, class_loader, protection_domain,
581 false, CHECK_(nullHandle));
582 interf = KlassHandle(THREAD, k);
584 if (LinkWellKnownClasses) // my super type is well known to me
585 cp->klass_at_put(interface_index, interf()); // eagerly resolve
586 }
588 if (!Klass::cast(interf())->is_interface()) {
589 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
590 }
591 interfaces->obj_at_put(index, interf());
592 }
594 if (!_need_verify || length <= 1) {
595 return interfaces;
596 }
598 // Check if there's any duplicates in interfaces
599 ResourceMark rm(THREAD);
600 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
601 THREAD, NameSigHash*, HASH_ROW_SIZE);
602 initialize_hashtable(interface_names);
603 bool dup = false;
604 {
605 debug_only(No_Safepoint_Verifier nsv;)
606 for (index = 0; index < length; index++) {
607 klassOop k = (klassOop)interfaces->obj_at(index);
608 symbolOop name = instanceKlass::cast(k)->name();
609 // If no duplicates, add (name, NULL) in hashtable interface_names.
610 if (!put_after_lookup(name, NULL, interface_names)) {
611 dup = true;
612 break;
613 }
614 }
615 }
616 if (dup) {
617 classfile_parse_error("Duplicate interface name in class file %s",
618 CHECK_(nullHandle));
619 }
621 return interfaces;
622 }
625 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
626 // Make sure the constant pool entry is of a type appropriate to this field
627 guarantee_property(
628 (constantvalue_index > 0 &&
629 constantvalue_index < cp->length()),
630 "Bad initial value index %u in ConstantValue attribute in class file %s",
631 constantvalue_index, CHECK);
632 constantTag value_type = cp->tag_at(constantvalue_index);
633 switch ( cp->basic_type_for_signature_at(signature_index) ) {
634 case T_LONG:
635 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
636 break;
637 case T_FLOAT:
638 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
639 break;
640 case T_DOUBLE:
641 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
642 break;
643 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
644 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
645 break;
646 case T_OBJECT:
647 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
648 && (value_type.is_string() || value_type.is_unresolved_string())),
649 "Bad string initial value in class file %s", CHECK);
650 break;
651 default:
652 classfile_parse_error(
653 "Unable to set initial value %u in class file %s",
654 constantvalue_index, CHECK);
655 }
656 }
659 // Parse attributes for a field.
660 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
661 u2 attributes_count,
662 bool is_static, u2 signature_index,
663 u2* constantvalue_index_addr,
664 bool* is_synthetic_addr,
665 u2* generic_signature_index_addr,
666 typeArrayHandle* field_annotations,
667 TRAPS) {
668 ClassFileStream* cfs = stream();
669 assert(attributes_count > 0, "length should be greater than 0");
670 u2 constantvalue_index = 0;
671 u2 generic_signature_index = 0;
672 bool is_synthetic = false;
673 u1* runtime_visible_annotations = NULL;
674 int runtime_visible_annotations_length = 0;
675 u1* runtime_invisible_annotations = NULL;
676 int runtime_invisible_annotations_length = 0;
677 while (attributes_count--) {
678 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
679 u2 attribute_name_index = cfs->get_u2_fast();
680 u4 attribute_length = cfs->get_u4_fast();
681 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
682 cp->tag_at(attribute_name_index).is_utf8(),
683 "Invalid field attribute index %u in class file %s",
684 attribute_name_index,
685 CHECK);
686 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
687 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
688 // ignore if non-static
689 if (constantvalue_index != 0) {
690 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
691 }
692 check_property(
693 attribute_length == 2,
694 "Invalid ConstantValue field attribute length %u in class file %s",
695 attribute_length, CHECK);
696 constantvalue_index = cfs->get_u2(CHECK);
697 if (_need_verify) {
698 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
699 }
700 } else if (attribute_name == vmSymbols::tag_synthetic()) {
701 if (attribute_length != 0) {
702 classfile_parse_error(
703 "Invalid Synthetic field attribute length %u in class file %s",
704 attribute_length, CHECK);
705 }
706 is_synthetic = true;
707 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
708 if (attribute_length != 0) {
709 classfile_parse_error(
710 "Invalid Deprecated field attribute length %u in class file %s",
711 attribute_length, CHECK);
712 }
713 } else if (_major_version >= JAVA_1_5_VERSION) {
714 if (attribute_name == vmSymbols::tag_signature()) {
715 if (attribute_length != 2) {
716 classfile_parse_error(
717 "Wrong size %u for field's Signature attribute in class file %s",
718 attribute_length, CHECK);
719 }
720 generic_signature_index = cfs->get_u2(CHECK);
721 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
722 runtime_visible_annotations_length = attribute_length;
723 runtime_visible_annotations = cfs->get_u1_buffer();
724 assert(runtime_visible_annotations != NULL, "null visible annotations");
725 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
726 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
727 runtime_invisible_annotations_length = attribute_length;
728 runtime_invisible_annotations = cfs->get_u1_buffer();
729 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
730 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
731 } else {
732 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
733 }
734 } else {
735 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
736 }
737 }
739 *constantvalue_index_addr = constantvalue_index;
740 *is_synthetic_addr = is_synthetic;
741 *generic_signature_index_addr = generic_signature_index;
742 *field_annotations = assemble_annotations(runtime_visible_annotations,
743 runtime_visible_annotations_length,
744 runtime_invisible_annotations,
745 runtime_invisible_annotations_length,
746 CHECK);
747 return;
748 }
751 // Field allocation types. Used for computing field offsets.
753 enum FieldAllocationType {
754 STATIC_OOP, // Oops
755 STATIC_BYTE, // Boolean, Byte, char
756 STATIC_SHORT, // shorts
757 STATIC_WORD, // ints
758 STATIC_DOUBLE, // long or double
759 STATIC_ALIGNED_DOUBLE,// aligned long or double
760 NONSTATIC_OOP,
761 NONSTATIC_BYTE,
762 NONSTATIC_SHORT,
763 NONSTATIC_WORD,
764 NONSTATIC_DOUBLE,
765 NONSTATIC_ALIGNED_DOUBLE
766 };
769 struct FieldAllocationCount {
770 unsigned int static_oop_count;
771 unsigned int static_byte_count;
772 unsigned int static_short_count;
773 unsigned int static_word_count;
774 unsigned int static_double_count;
775 unsigned int nonstatic_oop_count;
776 unsigned int nonstatic_byte_count;
777 unsigned int nonstatic_short_count;
778 unsigned int nonstatic_word_count;
779 unsigned int nonstatic_double_count;
780 };
782 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
783 struct FieldAllocationCount *fac,
784 objArrayHandle* fields_annotations, TRAPS) {
785 ClassFileStream* cfs = stream();
786 typeArrayHandle nullHandle;
787 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
788 u2 length = cfs->get_u2_fast();
789 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
790 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
791 typeArrayHandle fields(THREAD, new_fields);
793 int index = 0;
794 typeArrayHandle field_annotations;
795 for (int n = 0; n < length; n++) {
796 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
798 AccessFlags access_flags;
799 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
800 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
801 access_flags.set_flags(flags);
803 u2 name_index = cfs->get_u2_fast();
804 int cp_size = cp->length();
805 check_property(
806 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
807 "Invalid constant pool index %u for field name in class file %s",
808 name_index, CHECK_(nullHandle));
809 symbolHandle name(THREAD, cp->symbol_at(name_index));
810 verify_legal_field_name(name, CHECK_(nullHandle));
812 u2 signature_index = cfs->get_u2_fast();
813 check_property(
814 valid_cp_range(signature_index, cp_size) &&
815 cp->tag_at(signature_index).is_utf8(),
816 "Invalid constant pool index %u for field signature in class file %s",
817 signature_index, CHECK_(nullHandle));
818 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
819 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
821 u2 constantvalue_index = 0;
822 bool is_synthetic = false;
823 u2 generic_signature_index = 0;
824 bool is_static = access_flags.is_static();
826 u2 attributes_count = cfs->get_u2_fast();
827 if (attributes_count > 0) {
828 parse_field_attributes(cp, attributes_count, is_static, signature_index,
829 &constantvalue_index, &is_synthetic,
830 &generic_signature_index, &field_annotations,
831 CHECK_(nullHandle));
832 if (field_annotations.not_null()) {
833 if (fields_annotations->is_null()) {
834 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
835 *fields_annotations = objArrayHandle(THREAD, md);
836 }
837 (*fields_annotations)->obj_at_put(n, field_annotations());
838 }
839 if (is_synthetic) {
840 access_flags.set_is_synthetic();
841 }
842 }
844 fields->short_at_put(index++, access_flags.as_short());
845 fields->short_at_put(index++, name_index);
846 fields->short_at_put(index++, signature_index);
847 fields->short_at_put(index++, constantvalue_index);
849 // Remember how many oops we encountered and compute allocation type
850 BasicType type = cp->basic_type_for_signature_at(signature_index);
851 FieldAllocationType atype;
852 if ( is_static ) {
853 switch ( type ) {
854 case T_BOOLEAN:
855 case T_BYTE:
856 fac->static_byte_count++;
857 atype = STATIC_BYTE;
858 break;
859 case T_LONG:
860 case T_DOUBLE:
861 if (Universe::field_type_should_be_aligned(type)) {
862 atype = STATIC_ALIGNED_DOUBLE;
863 } else {
864 atype = STATIC_DOUBLE;
865 }
866 fac->static_double_count++;
867 break;
868 case T_CHAR:
869 case T_SHORT:
870 fac->static_short_count++;
871 atype = STATIC_SHORT;
872 break;
873 case T_FLOAT:
874 case T_INT:
875 fac->static_word_count++;
876 atype = STATIC_WORD;
877 break;
878 case T_ARRAY:
879 case T_OBJECT:
880 fac->static_oop_count++;
881 atype = STATIC_OOP;
882 break;
883 case T_ADDRESS:
884 case T_VOID:
885 default:
886 assert(0, "bad field type");
887 }
888 } else {
889 switch ( type ) {
890 case T_BOOLEAN:
891 case T_BYTE:
892 fac->nonstatic_byte_count++;
893 atype = NONSTATIC_BYTE;
894 break;
895 case T_LONG:
896 case T_DOUBLE:
897 if (Universe::field_type_should_be_aligned(type)) {
898 atype = NONSTATIC_ALIGNED_DOUBLE;
899 } else {
900 atype = NONSTATIC_DOUBLE;
901 }
902 fac->nonstatic_double_count++;
903 break;
904 case T_CHAR:
905 case T_SHORT:
906 fac->nonstatic_short_count++;
907 atype = NONSTATIC_SHORT;
908 break;
909 case T_FLOAT:
910 case T_INT:
911 fac->nonstatic_word_count++;
912 atype = NONSTATIC_WORD;
913 break;
914 case T_ARRAY:
915 case T_OBJECT:
916 fac->nonstatic_oop_count++;
917 atype = NONSTATIC_OOP;
918 break;
919 case T_ADDRESS:
920 case T_VOID:
921 default:
922 assert(0, "bad field type");
923 }
924 }
926 // The correct offset is computed later (all oop fields will be located together)
927 // We temporarily store the allocation type in the offset field
928 fields->short_at_put(index++, atype);
929 fields->short_at_put(index++, 0); // Clear out high word of byte offset
930 fields->short_at_put(index++, generic_signature_index);
931 }
933 if (_need_verify && length > 1) {
934 // Check duplicated fields
935 ResourceMark rm(THREAD);
936 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
937 THREAD, NameSigHash*, HASH_ROW_SIZE);
938 initialize_hashtable(names_and_sigs);
939 bool dup = false;
940 {
941 debug_only(No_Safepoint_Verifier nsv;)
942 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
943 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
944 symbolOop name = cp->symbol_at(name_index);
945 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
946 symbolOop sig = cp->symbol_at(sig_index);
947 // If no duplicates, add name/signature in hashtable names_and_sigs.
948 if (!put_after_lookup(name, sig, names_and_sigs)) {
949 dup = true;
950 break;
951 }
952 }
953 }
954 if (dup) {
955 classfile_parse_error("Duplicate field name&signature in class file %s",
956 CHECK_(nullHandle));
957 }
958 }
960 return fields;
961 }
964 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
965 while (length-- > 0) {
966 *dest++ = Bytes::get_Java_u2((u1*) (src++));
967 }
968 }
971 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
972 u4 exception_table_length,
973 constantPoolHandle cp,
974 TRAPS) {
975 ClassFileStream* cfs = stream();
976 typeArrayHandle nullHandle;
978 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
979 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
980 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
982 int index = 0;
983 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
984 for (unsigned int i = 0; i < exception_table_length; i++) {
985 u2 start_pc = cfs->get_u2_fast();
986 u2 end_pc = cfs->get_u2_fast();
987 u2 handler_pc = cfs->get_u2_fast();
988 u2 catch_type_index = cfs->get_u2_fast();
989 // Will check legal target after parsing code array in verifier.
990 if (_need_verify) {
991 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
992 "Illegal exception table range in class file %s", CHECK_(nullHandle));
993 guarantee_property(handler_pc < code_length,
994 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
995 if (catch_type_index != 0) {
996 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
997 is_klass_reference(cp, catch_type_index),
998 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
999 }
1000 }
1001 exception_handlers->int_at_put(index++, start_pc);
1002 exception_handlers->int_at_put(index++, end_pc);
1003 exception_handlers->int_at_put(index++, handler_pc);
1004 exception_handlers->int_at_put(index++, catch_type_index);
1005 }
1006 return exception_handlers;
1007 }
1009 void ClassFileParser::parse_linenumber_table(
1010 u4 code_attribute_length, u4 code_length,
1011 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1012 ClassFileStream* cfs = stream();
1013 unsigned int num_entries = cfs->get_u2(CHECK);
1015 // Each entry is a u2 start_pc, and a u2 line_number
1016 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1018 // Verify line number attribute and table length
1019 check_property(
1020 code_attribute_length == sizeof(u2) + length_in_bytes,
1021 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1023 cfs->guarantee_more(length_in_bytes, CHECK);
1025 if ((*write_stream) == NULL) {
1026 if (length_in_bytes > fixed_buffer_size) {
1027 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1028 } else {
1029 (*write_stream) = new CompressedLineNumberWriteStream(
1030 linenumbertable_buffer, fixed_buffer_size);
1031 }
1032 }
1034 while (num_entries-- > 0) {
1035 u2 bci = cfs->get_u2_fast(); // start_pc
1036 u2 line = cfs->get_u2_fast(); // line_number
1037 guarantee_property(bci < code_length,
1038 "Invalid pc in LineNumberTable in class file %s", CHECK);
1039 (*write_stream)->write_pair(bci, line);
1040 }
1041 }
1044 // Class file LocalVariableTable elements.
1045 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1046 public:
1047 u2 start_bci;
1048 u2 length;
1049 u2 name_cp_index;
1050 u2 descriptor_cp_index;
1051 u2 slot;
1052 };
1055 class LVT_Hash: public CHeapObj {
1056 public:
1057 LocalVariableTableElement *_elem; // element
1058 LVT_Hash* _next; // Next entry in hash table
1059 };
1061 unsigned int hash(LocalVariableTableElement *elem) {
1062 unsigned int raw_hash = elem->start_bci;
1064 raw_hash = elem->length + raw_hash * 37;
1065 raw_hash = elem->name_cp_index + raw_hash * 37;
1066 raw_hash = elem->slot + raw_hash * 37;
1068 return raw_hash % HASH_ROW_SIZE;
1069 }
1071 void initialize_hashtable(LVT_Hash** table) {
1072 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1073 table[i] = NULL;
1074 }
1075 }
1077 void clear_hashtable(LVT_Hash** table) {
1078 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1079 LVT_Hash* current = table[i];
1080 LVT_Hash* next;
1081 while (current != NULL) {
1082 next = current->_next;
1083 current->_next = NULL;
1084 delete(current);
1085 current = next;
1086 }
1087 table[i] = NULL;
1088 }
1089 }
1091 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1092 LVT_Hash* entry = table[index];
1094 /*
1095 * 3-tuple start_bci/length/slot has to be unique key,
1096 * so the following comparison seems to be redundant:
1097 * && elem->name_cp_index == entry->_elem->name_cp_index
1098 */
1099 while (entry != NULL) {
1100 if (elem->start_bci == entry->_elem->start_bci
1101 && elem->length == entry->_elem->length
1102 && elem->name_cp_index == entry->_elem->name_cp_index
1103 && elem->slot == entry->_elem->slot
1104 ) {
1105 return entry;
1106 }
1107 entry = entry->_next;
1108 }
1109 return NULL;
1110 }
1112 // Return false if the local variable is found in table.
1113 // Return true if no duplicate is found.
1114 // And local variable is added as a new entry in table.
1115 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1116 // First lookup for duplicates
1117 int index = hash(elem);
1118 LVT_Hash* entry = LVT_lookup(elem, index, table);
1120 if (entry != NULL) {
1121 return false;
1122 }
1123 // No duplicate is found, allocate a new entry and fill it.
1124 if ((entry = new LVT_Hash()) == NULL) {
1125 return false;
1126 }
1127 entry->_elem = elem;
1129 // Insert into hash table
1130 entry->_next = table[index];
1131 table[index] = entry;
1133 return true;
1134 }
1136 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1137 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1138 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1139 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1140 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1141 lvt->signature_cp_index = 0;
1142 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1143 }
1145 // Function is used to parse both attributes:
1146 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1147 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1148 u2 max_locals,
1149 u4 code_attribute_length,
1150 constantPoolHandle cp,
1151 u2* localvariable_table_length,
1152 bool isLVTT,
1153 TRAPS) {
1154 ClassFileStream* cfs = stream();
1155 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1156 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1157 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1158 // Verify local variable table attribute has right length
1159 if (_need_verify) {
1160 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1161 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1162 }
1163 u2* localvariable_table_start = cfs->get_u2_buffer();
1164 assert(localvariable_table_start != NULL, "null local variable table");
1165 if (!_need_verify) {
1166 cfs->skip_u2_fast(size);
1167 } else {
1168 cfs->guarantee_more(size * 2, CHECK_NULL);
1169 for(int i = 0; i < (*localvariable_table_length); i++) {
1170 u2 start_pc = cfs->get_u2_fast();
1171 u2 length = cfs->get_u2_fast();
1172 u2 name_index = cfs->get_u2_fast();
1173 u2 descriptor_index = cfs->get_u2_fast();
1174 u2 index = cfs->get_u2_fast();
1175 // Assign to a u4 to avoid overflow
1176 u4 end_pc = (u4)start_pc + (u4)length;
1178 if (start_pc >= code_length) {
1179 classfile_parse_error(
1180 "Invalid start_pc %u in %s in class file %s",
1181 start_pc, tbl_name, CHECK_NULL);
1182 }
1183 if (end_pc > code_length) {
1184 classfile_parse_error(
1185 "Invalid length %u in %s in class file %s",
1186 length, tbl_name, CHECK_NULL);
1187 }
1188 int cp_size = cp->length();
1189 guarantee_property(
1190 valid_cp_range(name_index, cp_size) &&
1191 cp->tag_at(name_index).is_utf8(),
1192 "Name index %u in %s has bad constant type in class file %s",
1193 name_index, tbl_name, CHECK_NULL);
1194 guarantee_property(
1195 valid_cp_range(descriptor_index, cp_size) &&
1196 cp->tag_at(descriptor_index).is_utf8(),
1197 "Signature index %u in %s has bad constant type in class file %s",
1198 descriptor_index, tbl_name, CHECK_NULL);
1200 symbolHandle name(THREAD, cp->symbol_at(name_index));
1201 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1202 verify_legal_field_name(name, CHECK_NULL);
1203 u2 extra_slot = 0;
1204 if (!isLVTT) {
1205 verify_legal_field_signature(name, sig, CHECK_NULL);
1207 // 4894874: check special cases for double and long local variables
1208 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1209 sig() == vmSymbols::type_signature(T_LONG)) {
1210 extra_slot = 1;
1211 }
1212 }
1213 guarantee_property((index + extra_slot) < max_locals,
1214 "Invalid index %u in %s in class file %s",
1215 index, tbl_name, CHECK_NULL);
1216 }
1217 }
1218 return localvariable_table_start;
1219 }
1222 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1223 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1224 ClassFileStream* cfs = stream();
1225 u2 index = 0; // index in the array with long/double occupying two slots
1226 u4 i1 = *u1_index;
1227 u4 i2 = *u2_index + 1;
1228 for(int i = 0; i < array_length; i++) {
1229 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1230 index++;
1231 if (tag == ITEM_Long || tag == ITEM_Double) {
1232 index++;
1233 } else if (tag == ITEM_Object) {
1234 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1235 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1236 is_klass_reference(cp, class_index),
1237 "Bad class index %u in StackMap in class file %s",
1238 class_index, CHECK);
1239 } else if (tag == ITEM_Uninitialized) {
1240 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1241 guarantee_property(
1242 offset < code_length,
1243 "Bad uninitialized type offset %u in StackMap in class file %s",
1244 offset, CHECK);
1245 } else {
1246 guarantee_property(
1247 tag <= (u1)ITEM_Uninitialized,
1248 "Unknown variable type %u in StackMap in class file %s",
1249 tag, CHECK);
1250 }
1251 }
1252 u2_array[*u2_index] = index;
1253 *u1_index = i1;
1254 *u2_index = i2;
1255 }
1257 typeArrayOop ClassFileParser::parse_stackmap_table(
1258 u4 code_attribute_length, TRAPS) {
1259 if (code_attribute_length == 0)
1260 return NULL;
1262 ClassFileStream* cfs = stream();
1263 u1* stackmap_table_start = cfs->get_u1_buffer();
1264 assert(stackmap_table_start != NULL, "null stackmap table");
1266 // check code_attribute_length first
1267 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1269 if (!_need_verify && !DumpSharedSpaces) {
1270 return NULL;
1271 }
1273 typeArrayOop stackmap_data =
1274 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1276 stackmap_data->set_length(code_attribute_length);
1277 memcpy((void*)stackmap_data->byte_at_addr(0),
1278 (void*)stackmap_table_start, code_attribute_length);
1279 return stackmap_data;
1280 }
1282 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1283 u4 method_attribute_length,
1284 constantPoolHandle cp, TRAPS) {
1285 ClassFileStream* cfs = stream();
1286 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1287 *checked_exceptions_length = cfs->get_u2_fast();
1288 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1289 u2* checked_exceptions_start = cfs->get_u2_buffer();
1290 assert(checked_exceptions_start != NULL, "null checked exceptions");
1291 if (!_need_verify) {
1292 cfs->skip_u2_fast(size);
1293 } else {
1294 // Verify each value in the checked exception table
1295 u2 checked_exception;
1296 u2 len = *checked_exceptions_length;
1297 cfs->guarantee_more(2 * len, CHECK_NULL);
1298 for (int i = 0; i < len; i++) {
1299 checked_exception = cfs->get_u2_fast();
1300 check_property(
1301 valid_cp_range(checked_exception, cp->length()) &&
1302 is_klass_reference(cp, checked_exception),
1303 "Exception name has bad type at constant pool %u in class file %s",
1304 checked_exception, CHECK_NULL);
1305 }
1306 }
1307 // check exceptions attribute length
1308 if (_need_verify) {
1309 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1310 sizeof(u2) * size),
1311 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1312 }
1313 return checked_exceptions_start;
1314 }
1317 #define MAX_ARGS_SIZE 255
1318 #define MAX_CODE_SIZE 65535
1319 #define INITIAL_MAX_LVT_NUMBER 256
1321 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1322 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1323 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1324 // entire method attribute is parsed.
1325 //
1326 // The promoted_flags parameter is used to pass relevant access_flags
1327 // from the method back up to the containing klass. These flag values
1328 // are added to klass's access_flags.
1330 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1331 AccessFlags *promoted_flags,
1332 typeArrayHandle* method_annotations,
1333 typeArrayHandle* method_parameter_annotations,
1334 typeArrayHandle* method_default_annotations,
1335 TRAPS) {
1336 ClassFileStream* cfs = stream();
1337 methodHandle nullHandle;
1338 ResourceMark rm(THREAD);
1339 // Parse fixed parts
1340 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1342 int flags = cfs->get_u2_fast();
1343 u2 name_index = cfs->get_u2_fast();
1344 int cp_size = cp->length();
1345 check_property(
1346 valid_cp_range(name_index, cp_size) &&
1347 cp->tag_at(name_index).is_utf8(),
1348 "Illegal constant pool index %u for method name in class file %s",
1349 name_index, CHECK_(nullHandle));
1350 symbolHandle name(THREAD, cp->symbol_at(name_index));
1351 verify_legal_method_name(name, CHECK_(nullHandle));
1353 u2 signature_index = cfs->get_u2_fast();
1354 guarantee_property(
1355 valid_cp_range(signature_index, cp_size) &&
1356 cp->tag_at(signature_index).is_utf8(),
1357 "Illegal constant pool index %u for method signature in class file %s",
1358 signature_index, CHECK_(nullHandle));
1359 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1361 AccessFlags access_flags;
1362 if (name == vmSymbols::class_initializer_name()) {
1363 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1364 flags = JVM_ACC_STATIC;
1365 } else {
1366 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1367 }
1369 int args_size = -1; // only used when _need_verify is true
1370 if (_need_verify) {
1371 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1372 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1373 if (args_size > MAX_ARGS_SIZE) {
1374 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1375 }
1376 }
1378 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1380 // Default values for code and exceptions attribute elements
1381 u2 max_stack = 0;
1382 u2 max_locals = 0;
1383 u4 code_length = 0;
1384 u1* code_start = 0;
1385 u2 exception_table_length = 0;
1386 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1387 u2 checked_exceptions_length = 0;
1388 u2* checked_exceptions_start = NULL;
1389 CompressedLineNumberWriteStream* linenumber_table = NULL;
1390 int linenumber_table_length = 0;
1391 int total_lvt_length = 0;
1392 u2 lvt_cnt = 0;
1393 u2 lvtt_cnt = 0;
1394 bool lvt_allocated = false;
1395 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1396 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1397 u2* localvariable_table_length;
1398 u2** localvariable_table_start;
1399 u2* localvariable_type_table_length;
1400 u2** localvariable_type_table_start;
1401 bool parsed_code_attribute = false;
1402 bool parsed_checked_exceptions_attribute = false;
1403 bool parsed_stackmap_attribute = false;
1404 // stackmap attribute - JDK1.5
1405 typeArrayHandle stackmap_data;
1406 u2 generic_signature_index = 0;
1407 u1* runtime_visible_annotations = NULL;
1408 int runtime_visible_annotations_length = 0;
1409 u1* runtime_invisible_annotations = NULL;
1410 int runtime_invisible_annotations_length = 0;
1411 u1* runtime_visible_parameter_annotations = NULL;
1412 int runtime_visible_parameter_annotations_length = 0;
1413 u1* runtime_invisible_parameter_annotations = NULL;
1414 int runtime_invisible_parameter_annotations_length = 0;
1415 u1* annotation_default = NULL;
1416 int annotation_default_length = 0;
1418 // Parse code and exceptions attribute
1419 u2 method_attributes_count = cfs->get_u2_fast();
1420 while (method_attributes_count--) {
1421 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1422 u2 method_attribute_name_index = cfs->get_u2_fast();
1423 u4 method_attribute_length = cfs->get_u4_fast();
1424 check_property(
1425 valid_cp_range(method_attribute_name_index, cp_size) &&
1426 cp->tag_at(method_attribute_name_index).is_utf8(),
1427 "Invalid method attribute name index %u in class file %s",
1428 method_attribute_name_index, CHECK_(nullHandle));
1430 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1431 if (method_attribute_name == vmSymbols::tag_code()) {
1432 // Parse Code attribute
1433 if (_need_verify) {
1434 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1435 "Code attribute in native or abstract methods in class file %s",
1436 CHECK_(nullHandle));
1437 }
1438 if (parsed_code_attribute) {
1439 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1440 }
1441 parsed_code_attribute = true;
1443 // Stack size, locals size, and code size
1444 if (_major_version == 45 && _minor_version <= 2) {
1445 cfs->guarantee_more(4, CHECK_(nullHandle));
1446 max_stack = cfs->get_u1_fast();
1447 max_locals = cfs->get_u1_fast();
1448 code_length = cfs->get_u2_fast();
1449 } else {
1450 cfs->guarantee_more(8, CHECK_(nullHandle));
1451 max_stack = cfs->get_u2_fast();
1452 max_locals = cfs->get_u2_fast();
1453 code_length = cfs->get_u4_fast();
1454 }
1455 if (_need_verify) {
1456 guarantee_property(args_size <= max_locals,
1457 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1458 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1459 "Invalid method Code length %u in class file %s",
1460 code_length, CHECK_(nullHandle));
1461 }
1462 // Code pointer
1463 code_start = cfs->get_u1_buffer();
1464 assert(code_start != NULL, "null code start");
1465 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1466 cfs->skip_u1_fast(code_length);
1468 // Exception handler table
1469 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1470 exception_table_length = cfs->get_u2_fast();
1471 if (exception_table_length > 0) {
1472 exception_handlers =
1473 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1474 }
1476 // Parse additional attributes in code attribute
1477 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1478 u2 code_attributes_count = cfs->get_u2_fast();
1480 unsigned int calculated_attribute_length = 0;
1482 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1483 calculated_attribute_length =
1484 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1485 } else {
1486 // max_stack, locals and length are smaller in pre-version 45.2 classes
1487 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1488 }
1489 calculated_attribute_length +=
1490 code_length +
1491 sizeof(exception_table_length) +
1492 sizeof(code_attributes_count) +
1493 exception_table_length *
1494 ( sizeof(u2) + // start_pc
1495 sizeof(u2) + // end_pc
1496 sizeof(u2) + // handler_pc
1497 sizeof(u2) ); // catch_type_index
1499 while (code_attributes_count--) {
1500 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1501 u2 code_attribute_name_index = cfs->get_u2_fast();
1502 u4 code_attribute_length = cfs->get_u4_fast();
1503 calculated_attribute_length += code_attribute_length +
1504 sizeof(code_attribute_name_index) +
1505 sizeof(code_attribute_length);
1506 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1507 cp->tag_at(code_attribute_name_index).is_utf8(),
1508 "Invalid code attribute name index %u in class file %s",
1509 code_attribute_name_index,
1510 CHECK_(nullHandle));
1511 if (LoadLineNumberTables &&
1512 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1513 // Parse and compress line number table
1514 parse_linenumber_table(code_attribute_length, code_length,
1515 &linenumber_table, CHECK_(nullHandle));
1517 } else if (LoadLocalVariableTables &&
1518 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1519 // Parse local variable table
1520 if (!lvt_allocated) {
1521 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1522 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1523 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1524 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1525 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1526 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1527 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1528 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1529 lvt_allocated = true;
1530 }
1531 if (lvt_cnt == max_lvt_cnt) {
1532 max_lvt_cnt <<= 1;
1533 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1534 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1535 }
1536 localvariable_table_start[lvt_cnt] =
1537 parse_localvariable_table(code_length,
1538 max_locals,
1539 code_attribute_length,
1540 cp,
1541 &localvariable_table_length[lvt_cnt],
1542 false, // is not LVTT
1543 CHECK_(nullHandle));
1544 total_lvt_length += localvariable_table_length[lvt_cnt];
1545 lvt_cnt++;
1546 } else if (LoadLocalVariableTypeTables &&
1547 _major_version >= JAVA_1_5_VERSION &&
1548 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1549 if (!lvt_allocated) {
1550 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1551 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1552 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1553 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1554 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1555 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1556 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1557 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1558 lvt_allocated = true;
1559 }
1560 // Parse local variable type table
1561 if (lvtt_cnt == max_lvtt_cnt) {
1562 max_lvtt_cnt <<= 1;
1563 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1564 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1565 }
1566 localvariable_type_table_start[lvtt_cnt] =
1567 parse_localvariable_table(code_length,
1568 max_locals,
1569 code_attribute_length,
1570 cp,
1571 &localvariable_type_table_length[lvtt_cnt],
1572 true, // is LVTT
1573 CHECK_(nullHandle));
1574 lvtt_cnt++;
1575 } else if (UseSplitVerifier &&
1576 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1577 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1578 // Stack map is only needed by the new verifier in JDK1.5.
1579 if (parsed_stackmap_attribute) {
1580 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1581 }
1582 typeArrayOop sm =
1583 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1584 stackmap_data = typeArrayHandle(THREAD, sm);
1585 parsed_stackmap_attribute = true;
1586 } else {
1587 // Skip unknown attributes
1588 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1589 }
1590 }
1591 // check method attribute length
1592 if (_need_verify) {
1593 guarantee_property(method_attribute_length == calculated_attribute_length,
1594 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1595 }
1596 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1597 // Parse Exceptions attribute
1598 if (parsed_checked_exceptions_attribute) {
1599 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1600 }
1601 parsed_checked_exceptions_attribute = true;
1602 checked_exceptions_start =
1603 parse_checked_exceptions(&checked_exceptions_length,
1604 method_attribute_length,
1605 cp, CHECK_(nullHandle));
1606 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1607 if (method_attribute_length != 0) {
1608 classfile_parse_error(
1609 "Invalid Synthetic method attribute length %u in class file %s",
1610 method_attribute_length, CHECK_(nullHandle));
1611 }
1612 // Should we check that there hasn't already been a synthetic attribute?
1613 access_flags.set_is_synthetic();
1614 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1615 if (method_attribute_length != 0) {
1616 classfile_parse_error(
1617 "Invalid Deprecated method attribute length %u in class file %s",
1618 method_attribute_length, CHECK_(nullHandle));
1619 }
1620 } else if (_major_version >= JAVA_1_5_VERSION) {
1621 if (method_attribute_name == vmSymbols::tag_signature()) {
1622 if (method_attribute_length != 2) {
1623 classfile_parse_error(
1624 "Invalid Signature attribute length %u in class file %s",
1625 method_attribute_length, CHECK_(nullHandle));
1626 }
1627 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1628 generic_signature_index = cfs->get_u2_fast();
1629 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1630 runtime_visible_annotations_length = method_attribute_length;
1631 runtime_visible_annotations = cfs->get_u1_buffer();
1632 assert(runtime_visible_annotations != NULL, "null visible annotations");
1633 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1634 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1635 runtime_invisible_annotations_length = method_attribute_length;
1636 runtime_invisible_annotations = cfs->get_u1_buffer();
1637 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1638 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1639 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1640 runtime_visible_parameter_annotations_length = method_attribute_length;
1641 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1642 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1643 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1644 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1645 runtime_invisible_parameter_annotations_length = method_attribute_length;
1646 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1647 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1648 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1649 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1650 annotation_default_length = method_attribute_length;
1651 annotation_default = cfs->get_u1_buffer();
1652 assert(annotation_default != NULL, "null annotation default");
1653 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1654 } else {
1655 // Skip unknown attributes
1656 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1657 }
1658 } else {
1659 // Skip unknown attributes
1660 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1661 }
1662 }
1664 if (linenumber_table != NULL) {
1665 linenumber_table->write_terminator();
1666 linenumber_table_length = linenumber_table->position();
1667 }
1669 // Make sure there's at least one Code attribute in non-native/non-abstract method
1670 if (_need_verify) {
1671 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1672 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1673 }
1675 // All sizing information for a methodOop is finally available, now create it
1676 methodOop m_oop = oopFactory::new_method(
1677 code_length, access_flags, linenumber_table_length,
1678 total_lvt_length, checked_exceptions_length,
1679 methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1680 methodHandle m (THREAD, m_oop);
1682 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1684 // Fill in information from fixed part (access_flags already set)
1685 m->set_constants(cp());
1686 m->set_name_index(name_index);
1687 m->set_signature_index(signature_index);
1688 m->set_generic_signature_index(generic_signature_index);
1689 #ifdef CC_INTERP
1690 // hmm is there a gc issue here??
1691 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1692 m->set_result_index(rtf.type());
1693 #endif
1695 if (args_size >= 0) {
1696 m->set_size_of_parameters(args_size);
1697 } else {
1698 m->compute_size_of_parameters(THREAD);
1699 }
1700 #ifdef ASSERT
1701 if (args_size >= 0) {
1702 m->compute_size_of_parameters(THREAD);
1703 assert(args_size == m->size_of_parameters(), "");
1704 }
1705 #endif
1707 // Fill in code attribute information
1708 m->set_max_stack(max_stack);
1709 m->set_max_locals(max_locals);
1710 m->constMethod()->set_stackmap_data(stackmap_data());
1712 /**
1713 * The exception_table field is the flag used to indicate
1714 * that the methodOop and it's associated constMethodOop are partially
1715 * initialized and thus are exempt from pre/post GC verification. Once
1716 * the field is set, the oops are considered fully initialized so make
1717 * sure that the oops can pass verification when this field is set.
1718 */
1719 m->set_exception_table(exception_handlers());
1721 // Copy byte codes
1722 m->set_code(code_start);
1724 // Copy line number table
1725 if (linenumber_table != NULL) {
1726 memcpy(m->compressed_linenumber_table(),
1727 linenumber_table->buffer(), linenumber_table_length);
1728 }
1730 // Copy checked exceptions
1731 if (checked_exceptions_length > 0) {
1732 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1733 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1734 }
1736 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1737 *
1738 * Rules for LVT's and LVTT's are:
1739 * - There can be any number of LVT's and LVTT's.
1740 * - If there are n LVT's, it is the same as if there was just
1741 * one LVT containing all the entries from the n LVT's.
1742 * - There may be no more than one LVT entry per local variable.
1743 * Two LVT entries are 'equal' if these fields are the same:
1744 * start_pc, length, name, slot
1745 * - There may be no more than one LVTT entry per each LVT entry.
1746 * Each LVTT entry has to match some LVT entry.
1747 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1748 */
1749 if (total_lvt_length > 0) {
1750 int tbl_no, idx;
1752 promoted_flags->set_has_localvariable_table();
1754 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1755 initialize_hashtable(lvt_Hash);
1757 // To fill LocalVariableTable in
1758 Classfile_LVT_Element* cf_lvt;
1759 LocalVariableTableElement* lvt = m->localvariable_table_start();
1761 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1762 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1763 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1764 copy_lvt_element(&cf_lvt[idx], lvt);
1765 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1766 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1767 && _need_verify
1768 && _major_version >= JAVA_1_5_VERSION ) {
1769 clear_hashtable(lvt_Hash);
1770 classfile_parse_error("Duplicated LocalVariableTable attribute "
1771 "entry for '%s' in class file %s",
1772 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1773 CHECK_(nullHandle));
1774 }
1775 }
1776 }
1778 // To merge LocalVariableTable and LocalVariableTypeTable
1779 Classfile_LVT_Element* cf_lvtt;
1780 LocalVariableTableElement lvtt_elem;
1782 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1783 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1784 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1785 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1786 int index = hash(&lvtt_elem);
1787 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1788 if (entry == NULL) {
1789 if (_need_verify) {
1790 clear_hashtable(lvt_Hash);
1791 classfile_parse_error("LVTT entry for '%s' in class file %s "
1792 "does not match any LVT entry",
1793 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1794 CHECK_(nullHandle));
1795 }
1796 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1797 clear_hashtable(lvt_Hash);
1798 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1799 "entry for '%s' in class file %s",
1800 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1801 CHECK_(nullHandle));
1802 } else {
1803 // to add generic signatures into LocalVariableTable
1804 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1805 }
1806 }
1807 }
1808 clear_hashtable(lvt_Hash);
1809 }
1811 *method_annotations = assemble_annotations(runtime_visible_annotations,
1812 runtime_visible_annotations_length,
1813 runtime_invisible_annotations,
1814 runtime_invisible_annotations_length,
1815 CHECK_(nullHandle));
1816 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1817 runtime_visible_parameter_annotations_length,
1818 runtime_invisible_parameter_annotations,
1819 runtime_invisible_parameter_annotations_length,
1820 CHECK_(nullHandle));
1821 *method_default_annotations = assemble_annotations(annotation_default,
1822 annotation_default_length,
1823 NULL,
1824 0,
1825 CHECK_(nullHandle));
1827 if (name() == vmSymbols::finalize_method_name() &&
1828 signature() == vmSymbols::void_method_signature()) {
1829 if (m->is_empty_method()) {
1830 _has_empty_finalizer = true;
1831 } else {
1832 _has_finalizer = true;
1833 }
1834 }
1835 if (name() == vmSymbols::object_initializer_name() &&
1836 signature() == vmSymbols::void_method_signature() &&
1837 m->is_vanilla_constructor()) {
1838 _has_vanilla_constructor = true;
1839 }
1841 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
1842 m->is_method_handle_adapter())) {
1843 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
1844 "Method handle invokers must be defined internally to the VM", nullHandle);
1845 }
1847 return m;
1848 }
1851 // The promoted_flags parameter is used to pass relevant access_flags
1852 // from the methods back up to the containing klass. These flag values
1853 // are added to klass's access_flags.
1855 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1856 AccessFlags* promoted_flags,
1857 bool* has_final_method,
1858 objArrayOop* methods_annotations_oop,
1859 objArrayOop* methods_parameter_annotations_oop,
1860 objArrayOop* methods_default_annotations_oop,
1861 TRAPS) {
1862 ClassFileStream* cfs = stream();
1863 objArrayHandle nullHandle;
1864 typeArrayHandle method_annotations;
1865 typeArrayHandle method_parameter_annotations;
1866 typeArrayHandle method_default_annotations;
1867 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1868 u2 length = cfs->get_u2_fast();
1869 if (length == 0) {
1870 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1871 } else {
1872 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1873 objArrayHandle methods(THREAD, m);
1874 HandleMark hm(THREAD);
1875 objArrayHandle methods_annotations;
1876 objArrayHandle methods_parameter_annotations;
1877 objArrayHandle methods_default_annotations;
1878 for (int index = 0; index < length; index++) {
1879 methodHandle method = parse_method(cp, is_interface,
1880 promoted_flags,
1881 &method_annotations,
1882 &method_parameter_annotations,
1883 &method_default_annotations,
1884 CHECK_(nullHandle));
1885 if (method->is_final()) {
1886 *has_final_method = true;
1887 }
1888 methods->obj_at_put(index, method());
1889 if (method_annotations.not_null()) {
1890 if (methods_annotations.is_null()) {
1891 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1892 methods_annotations = objArrayHandle(THREAD, md);
1893 }
1894 methods_annotations->obj_at_put(index, method_annotations());
1895 }
1896 if (method_parameter_annotations.not_null()) {
1897 if (methods_parameter_annotations.is_null()) {
1898 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1899 methods_parameter_annotations = objArrayHandle(THREAD, md);
1900 }
1901 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1902 }
1903 if (method_default_annotations.not_null()) {
1904 if (methods_default_annotations.is_null()) {
1905 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1906 methods_default_annotations = objArrayHandle(THREAD, md);
1907 }
1908 methods_default_annotations->obj_at_put(index, method_default_annotations());
1909 }
1910 }
1911 if (_need_verify && length > 1) {
1912 // Check duplicated methods
1913 ResourceMark rm(THREAD);
1914 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1915 THREAD, NameSigHash*, HASH_ROW_SIZE);
1916 initialize_hashtable(names_and_sigs);
1917 bool dup = false;
1918 {
1919 debug_only(No_Safepoint_Verifier nsv;)
1920 for (int i = 0; i < length; i++) {
1921 methodOop m = (methodOop)methods->obj_at(i);
1922 // If no duplicates, add name/signature in hashtable names_and_sigs.
1923 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1924 dup = true;
1925 break;
1926 }
1927 }
1928 }
1929 if (dup) {
1930 classfile_parse_error("Duplicate method name&signature in class file %s",
1931 CHECK_(nullHandle));
1932 }
1933 }
1935 *methods_annotations_oop = methods_annotations();
1936 *methods_parameter_annotations_oop = methods_parameter_annotations();
1937 *methods_default_annotations_oop = methods_default_annotations();
1939 return methods;
1940 }
1941 }
1944 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1945 objArrayHandle methods_annotations,
1946 objArrayHandle methods_parameter_annotations,
1947 objArrayHandle methods_default_annotations,
1948 TRAPS) {
1949 typeArrayHandle nullHandle;
1950 int length = methods()->length();
1951 // If JVMTI original method ordering is enabled we have to
1952 // remember the original class file ordering.
1953 // We temporarily use the vtable_index field in the methodOop to store the
1954 // class file index, so we can read in after calling qsort.
1955 if (JvmtiExport::can_maintain_original_method_order()) {
1956 for (int index = 0; index < length; index++) {
1957 methodOop m = methodOop(methods->obj_at(index));
1958 assert(!m->valid_vtable_index(), "vtable index should not be set");
1959 m->set_vtable_index(index);
1960 }
1961 }
1962 // Sort method array by ascending method name (for faster lookups & vtable construction)
1963 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1964 methodOopDesc::sort_methods(methods(),
1965 methods_annotations(),
1966 methods_parameter_annotations(),
1967 methods_default_annotations());
1969 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1970 if (JvmtiExport::can_maintain_original_method_order()) {
1971 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1972 typeArrayHandle method_ordering(THREAD, new_ordering);
1973 for (int index = 0; index < length; index++) {
1974 methodOop m = methodOop(methods->obj_at(index));
1975 int old_index = m->vtable_index();
1976 assert(old_index >= 0 && old_index < length, "invalid method index");
1977 method_ordering->int_at_put(index, old_index);
1978 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1979 }
1980 return method_ordering;
1981 } else {
1982 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1983 }
1984 }
1987 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1988 ClassFileStream* cfs = stream();
1989 cfs->guarantee_more(2, CHECK); // sourcefile_index
1990 u2 sourcefile_index = cfs->get_u2_fast();
1991 check_property(
1992 valid_cp_range(sourcefile_index, cp->length()) &&
1993 cp->tag_at(sourcefile_index).is_utf8(),
1994 "Invalid SourceFile attribute at constant pool index %u in class file %s",
1995 sourcefile_index, CHECK);
1996 k->set_source_file_name(cp->symbol_at(sourcefile_index));
1997 }
2001 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2002 instanceKlassHandle k,
2003 int length, TRAPS) {
2004 ClassFileStream* cfs = stream();
2005 u1* sde_buffer = cfs->get_u1_buffer();
2006 assert(sde_buffer != NULL, "null sde buffer");
2008 // Don't bother storing it if there is no way to retrieve it
2009 if (JvmtiExport::can_get_source_debug_extension()) {
2010 // Optimistically assume that only 1 byte UTF format is used
2011 // (common case)
2012 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2013 length, CHECK);
2014 k->set_source_debug_extension(sde_symbol);
2015 }
2016 // Got utf8 string, set stream position forward
2017 cfs->skip_u1(length, CHECK);
2018 }
2021 // Inner classes can be static, private or protected (classic VM does this)
2022 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2024 // Return number of classes in the inner classes attribute table
2025 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2026 ClassFileStream* cfs = stream();
2027 cfs->guarantee_more(2, CHECK_0); // length
2028 u2 length = cfs->get_u2_fast();
2030 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2031 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2032 typeArrayHandle inner_classes(THREAD, ic);
2033 int index = 0;
2034 int cp_size = cp->length();
2035 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2036 for (int n = 0; n < length; n++) {
2037 // Inner class index
2038 u2 inner_class_info_index = cfs->get_u2_fast();
2039 check_property(
2040 inner_class_info_index == 0 ||
2041 (valid_cp_range(inner_class_info_index, cp_size) &&
2042 is_klass_reference(cp, inner_class_info_index)),
2043 "inner_class_info_index %u has bad constant type in class file %s",
2044 inner_class_info_index, CHECK_0);
2045 // Outer class index
2046 u2 outer_class_info_index = cfs->get_u2_fast();
2047 check_property(
2048 outer_class_info_index == 0 ||
2049 (valid_cp_range(outer_class_info_index, cp_size) &&
2050 is_klass_reference(cp, outer_class_info_index)),
2051 "outer_class_info_index %u has bad constant type in class file %s",
2052 outer_class_info_index, CHECK_0);
2053 // Inner class name
2054 u2 inner_name_index = cfs->get_u2_fast();
2055 check_property(
2056 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2057 cp->tag_at(inner_name_index).is_utf8()),
2058 "inner_name_index %u has bad constant type in class file %s",
2059 inner_name_index, CHECK_0);
2060 if (_need_verify) {
2061 guarantee_property(inner_class_info_index != outer_class_info_index,
2062 "Class is both outer and inner class in class file %s", CHECK_0);
2063 }
2064 // Access flags
2065 AccessFlags inner_access_flags;
2066 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2067 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2068 // Set abstract bit for old class files for backward compatibility
2069 flags |= JVM_ACC_ABSTRACT;
2070 }
2071 verify_legal_class_modifiers(flags, CHECK_0);
2072 inner_access_flags.set_flags(flags);
2074 inner_classes->short_at_put(index++, inner_class_info_index);
2075 inner_classes->short_at_put(index++, outer_class_info_index);
2076 inner_classes->short_at_put(index++, inner_name_index);
2077 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2078 }
2080 // 4347400: make sure there's no duplicate entry in the classes array
2081 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2082 for(int i = 0; i < inner_classes->length(); i += 4) {
2083 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2084 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2085 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2086 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2087 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2088 "Duplicate entry in InnerClasses in class file %s",
2089 CHECK_0);
2090 }
2091 }
2092 }
2094 // Update instanceKlass with inner class info.
2095 k->set_inner_classes(inner_classes());
2096 return length;
2097 }
2099 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2100 k->set_is_synthetic();
2101 }
2103 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2104 ClassFileStream* cfs = stream();
2105 u2 signature_index = cfs->get_u2(CHECK);
2106 check_property(
2107 valid_cp_range(signature_index, cp->length()) &&
2108 cp->tag_at(signature_index).is_utf8(),
2109 "Invalid constant pool index %u in Signature attribute in class file %s",
2110 signature_index, CHECK);
2111 k->set_generic_signature(cp->symbol_at(signature_index));
2112 }
2114 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2115 ClassFileStream* cfs = stream();
2116 // Set inner classes attribute to default sentinel
2117 k->set_inner_classes(Universe::the_empty_short_array());
2118 cfs->guarantee_more(2, CHECK); // attributes_count
2119 u2 attributes_count = cfs->get_u2_fast();
2120 bool parsed_sourcefile_attribute = false;
2121 bool parsed_innerclasses_attribute = false;
2122 bool parsed_enclosingmethod_attribute = false;
2123 u1* runtime_visible_annotations = NULL;
2124 int runtime_visible_annotations_length = 0;
2125 u1* runtime_invisible_annotations = NULL;
2126 int runtime_invisible_annotations_length = 0;
2127 // Iterate over attributes
2128 while (attributes_count--) {
2129 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2130 u2 attribute_name_index = cfs->get_u2_fast();
2131 u4 attribute_length = cfs->get_u4_fast();
2132 check_property(
2133 valid_cp_range(attribute_name_index, cp->length()) &&
2134 cp->tag_at(attribute_name_index).is_utf8(),
2135 "Attribute name has bad constant pool index %u in class file %s",
2136 attribute_name_index, CHECK);
2137 symbolOop tag = cp->symbol_at(attribute_name_index);
2138 if (tag == vmSymbols::tag_source_file()) {
2139 // Check for SourceFile tag
2140 if (_need_verify) {
2141 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2142 }
2143 if (parsed_sourcefile_attribute) {
2144 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2145 } else {
2146 parsed_sourcefile_attribute = true;
2147 }
2148 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2149 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2150 // Check for SourceDebugExtension tag
2151 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2152 } else if (tag == vmSymbols::tag_inner_classes()) {
2153 // Check for InnerClasses tag
2154 if (parsed_innerclasses_attribute) {
2155 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2156 } else {
2157 parsed_innerclasses_attribute = true;
2158 }
2159 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2160 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2161 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2162 "Wrong InnerClasses attribute length in class file %s", CHECK);
2163 }
2164 } else if (tag == vmSymbols::tag_synthetic()) {
2165 // Check for Synthetic tag
2166 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2167 if (attribute_length != 0) {
2168 classfile_parse_error(
2169 "Invalid Synthetic classfile attribute length %u in class file %s",
2170 attribute_length, CHECK);
2171 }
2172 parse_classfile_synthetic_attribute(cp, k, CHECK);
2173 } else if (tag == vmSymbols::tag_deprecated()) {
2174 // Check for Deprecatd tag - 4276120
2175 if (attribute_length != 0) {
2176 classfile_parse_error(
2177 "Invalid Deprecated classfile attribute length %u in class file %s",
2178 attribute_length, CHECK);
2179 }
2180 } else if (_major_version >= JAVA_1_5_VERSION) {
2181 if (tag == vmSymbols::tag_signature()) {
2182 if (attribute_length != 2) {
2183 classfile_parse_error(
2184 "Wrong Signature attribute length %u in class file %s",
2185 attribute_length, CHECK);
2186 }
2187 parse_classfile_signature_attribute(cp, k, CHECK);
2188 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2189 runtime_visible_annotations_length = attribute_length;
2190 runtime_visible_annotations = cfs->get_u1_buffer();
2191 assert(runtime_visible_annotations != NULL, "null visible annotations");
2192 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2193 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2194 runtime_invisible_annotations_length = attribute_length;
2195 runtime_invisible_annotations = cfs->get_u1_buffer();
2196 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2197 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2198 } else if (tag == vmSymbols::tag_enclosing_method()) {
2199 if (parsed_enclosingmethod_attribute) {
2200 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2201 } else {
2202 parsed_enclosingmethod_attribute = true;
2203 }
2204 cfs->guarantee_more(4, CHECK); // class_index, method_index
2205 u2 class_index = cfs->get_u2_fast();
2206 u2 method_index = cfs->get_u2_fast();
2207 if (class_index == 0) {
2208 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2209 }
2210 // Validate the constant pool indices and types
2211 if (!cp->is_within_bounds(class_index) ||
2212 !is_klass_reference(cp, class_index)) {
2213 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2214 }
2215 if (method_index != 0 &&
2216 (!cp->is_within_bounds(method_index) ||
2217 !cp->tag_at(method_index).is_name_and_type())) {
2218 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2219 }
2220 k->set_enclosing_method_indices(class_index, method_index);
2221 } else {
2222 // Unknown attribute
2223 cfs->skip_u1(attribute_length, CHECK);
2224 }
2225 } else {
2226 // Unknown attribute
2227 cfs->skip_u1(attribute_length, CHECK);
2228 }
2229 }
2230 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2231 runtime_visible_annotations_length,
2232 runtime_invisible_annotations,
2233 runtime_invisible_annotations_length,
2234 CHECK);
2235 k->set_class_annotations(annotations());
2236 }
2239 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2240 int runtime_visible_annotations_length,
2241 u1* runtime_invisible_annotations,
2242 int runtime_invisible_annotations_length, TRAPS) {
2243 typeArrayHandle annotations;
2244 if (runtime_visible_annotations != NULL ||
2245 runtime_invisible_annotations != NULL) {
2246 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2247 runtime_invisible_annotations_length, CHECK_(annotations));
2248 annotations = typeArrayHandle(THREAD, anno);
2249 if (runtime_visible_annotations != NULL) {
2250 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2251 }
2252 if (runtime_invisible_annotations != NULL) {
2253 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2254 }
2255 }
2256 return annotations;
2257 }
2260 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2261 KlassHandle h_k (THREAD, fd->field_holder());
2262 assert(h_k.not_null() && fd->is_static(), "just checking");
2263 if (fd->has_initial_value()) {
2264 BasicType t = fd->field_type();
2265 switch (t) {
2266 case T_BYTE:
2267 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2268 break;
2269 case T_BOOLEAN:
2270 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2271 break;
2272 case T_CHAR:
2273 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2274 break;
2275 case T_SHORT:
2276 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2277 break;
2278 case T_INT:
2279 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2280 break;
2281 case T_FLOAT:
2282 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2283 break;
2284 case T_DOUBLE:
2285 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2286 break;
2287 case T_LONG:
2288 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2289 break;
2290 case T_OBJECT:
2291 {
2292 #ifdef ASSERT
2293 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2294 assert(fd->signature() == sym, "just checking");
2295 #endif
2296 oop string = fd->string_initial_value(CHECK);
2297 h_k()->obj_field_put(fd->offset(), string);
2298 }
2299 break;
2300 default:
2301 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2302 "Illegal ConstantValue attribute in class file");
2303 }
2304 }
2305 }
2308 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2309 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2310 // This code is for compatibility with earlier jdk's that do not
2311 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2312 // the check for the "discovered" field should issue a warning if
2313 // the field is not found. For 1.6 this code should be issue a
2314 // fatal error if the "discovered" field is not found.
2315 //
2316 // Increment fac.nonstatic_oop_count so that the start of the
2317 // next type of non-static oops leaves room for the fake oop.
2318 // Do not increment next_nonstatic_oop_offset so that the
2319 // fake oop is place after the java.lang.ref.Reference oop
2320 // fields.
2321 //
2322 // Check the fields in java.lang.ref.Reference for the "discovered"
2323 // field. If it is not present, artifically create a field for it.
2324 // This allows this VM to run on early JDK where the field is not
2325 // present.
2327 //
2328 // Increment fac.nonstatic_oop_count so that the start of the
2329 // next type of non-static oops leaves room for the fake oop.
2330 // Do not increment next_nonstatic_oop_offset so that the
2331 // fake oop is place after the java.lang.ref.Reference oop
2332 // fields.
2333 //
2334 // Check the fields in java.lang.ref.Reference for the "discovered"
2335 // field. If it is not present, artifically create a field for it.
2336 // This allows this VM to run on early JDK where the field is not
2337 // present.
2338 int reference_sig_index = 0;
2339 int reference_name_index = 0;
2340 int reference_index = 0;
2341 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2342 const int n = (*fields_ptr)()->length();
2343 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2344 int name_index =
2345 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2346 int sig_index =
2347 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2348 symbolOop f_name = cp->symbol_at(name_index);
2349 symbolOop f_sig = cp->symbol_at(sig_index);
2350 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2351 // Save the index for reference signature for later use.
2352 // The fake discovered field does not entries in the
2353 // constant pool so the index for its signature cannot
2354 // be extracted from the constant pool. It will need
2355 // later, however. It's signature is vmSymbols::reference_signature()
2356 // so same an index for that signature.
2357 reference_sig_index = sig_index;
2358 reference_name_index = name_index;
2359 reference_index = i;
2360 }
2361 if (f_name == vmSymbols::reference_discovered_name() &&
2362 f_sig == vmSymbols::reference_signature()) {
2363 // The values below are fake but will force extra
2364 // non-static oop fields and a corresponding non-static
2365 // oop map block to be allocated.
2366 extra = 0;
2367 break;
2368 }
2369 }
2370 if (extra != 0) {
2371 fac_ptr->nonstatic_oop_count += extra;
2372 // Add the additional entry to "fields" so that the klass
2373 // contains the "discoverd" field and the field will be initialized
2374 // in instances of the object.
2375 int fields_with_fix_length = (*fields_ptr)()->length() +
2376 instanceKlass::next_offset;
2377 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2378 fields_with_fix_length, CHECK);
2379 typeArrayHandle fields_with_fix(THREAD, ff);
2381 // Take everything from the original but the length.
2382 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2383 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2384 }
2386 // Add the fake field at the end.
2387 int i = (*fields_ptr)->length();
2388 // There is no name index for the fake "discovered" field nor
2389 // signature but a signature is needed so that the field will
2390 // be properly initialized. Use one found for
2391 // one of the other reference fields. Be sure the index for the
2392 // name is 0. In fieldDescriptor::initialize() the index of the
2393 // name is checked. That check is by passed for the last nonstatic
2394 // oop field in a java.lang.ref.Reference which is assumed to be
2395 // this artificial "discovered" field. An assertion checks that
2396 // the name index is 0.
2397 assert(reference_index != 0, "Missing signature for reference");
2399 int j;
2400 for (j = 0; j < instanceKlass::next_offset; j++) {
2401 fields_with_fix->ushort_at_put(i + j,
2402 (*fields_ptr)->ushort_at(reference_index +j));
2403 }
2404 // Clear the public access flag and set the private access flag.
2405 short flags;
2406 flags =
2407 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2408 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2409 flags = flags & (~JVM_ACC_PUBLIC);
2410 flags = flags | JVM_ACC_PRIVATE;
2411 AccessFlags access_flags;
2412 access_flags.set_flags(flags);
2413 assert(!access_flags.is_public(), "Failed to clear public flag");
2414 assert(access_flags.is_private(), "Failed to set private flag");
2415 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2416 flags);
2418 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2419 == reference_name_index, "The fake reference name is incorrect");
2420 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2421 == reference_sig_index, "The fake reference signature is incorrect");
2422 // The type of the field is stored in the low_offset entry during
2423 // parsing.
2424 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2425 NONSTATIC_OOP, "The fake reference type is incorrect");
2427 // "fields" is allocated in the permanent generation. Disgard
2428 // it and let it be collected.
2429 (*fields_ptr) = fields_with_fix;
2430 }
2431 return;
2432 }
2435 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2436 FieldAllocationCount *fac_ptr, TRAPS) {
2437 // Add fake fields for java.lang.Class instances
2438 //
2439 // This is not particularly nice. We should consider adding a
2440 // private transient object field at the Java level to
2441 // java.lang.Class. Alternatively we could add a subclass of
2442 // instanceKlass which provides an accessor and size computer for
2443 // this field, but that appears to be more code than this hack.
2444 //
2445 // NOTE that we wedge these in at the beginning rather than the
2446 // end of the object because the Class layout changed between JDK
2447 // 1.3 and JDK 1.4 with the new reflection implementation; some
2448 // nonstatic oop fields were added at the Java level. The offsets
2449 // of these fake fields can't change between these two JDK
2450 // versions because when the offsets are computed at bootstrap
2451 // time we don't know yet which version of the JDK we're running in.
2453 // The values below are fake but will force two non-static oop fields and
2454 // a corresponding non-static oop map block to be allocated.
2455 const int extra = java_lang_Class::number_of_fake_oop_fields;
2456 fac_ptr->nonstatic_oop_count += extra;
2457 }
2460 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2461 // Cause the extra fake fields in java.lang.Class to show up before
2462 // the Java fields for layout compatibility between 1.3 and 1.4
2463 // Incrementing next_nonstatic_oop_offset here advances the
2464 // location where the real java fields are placed.
2465 const int extra = java_lang_Class::number_of_fake_oop_fields;
2466 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2467 }
2470 // Force MethodHandle.vmentry to be an unmanaged pointer.
2471 // There is no way for a classfile to express this, so we must help it.
2472 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2473 typeArrayHandle* fields_ptr,
2474 FieldAllocationCount *fac_ptr,
2475 TRAPS) {
2476 // Add fake fields for java.dyn.MethodHandle instances
2477 //
2478 // This is not particularly nice, but since there is no way to express
2479 // a native wordSize field in Java, we must do it at this level.
2481 if (!EnableMethodHandles) return;
2483 int word_sig_index = 0;
2484 const int cp_size = cp->length();
2485 for (int index = 1; index < cp_size; index++) {
2486 if (cp->tag_at(index).is_utf8() &&
2487 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2488 word_sig_index = index;
2489 break;
2490 }
2491 }
2493 if (word_sig_index == 0)
2494 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2495 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2497 bool found_vmentry = false;
2499 const int n = (*fields_ptr)()->length();
2500 for (int i = 0; i < n; i += instanceKlass::next_offset) {
2501 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2502 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2503 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2504 symbolOop f_name = cp->symbol_at(name_index);
2505 symbolOop f_sig = cp->symbol_at(sig_index);
2506 if (f_sig == vmSymbols::byte_signature() &&
2507 f_name == vmSymbols::vmentry_name() &&
2508 (acc_flags & JVM_ACC_STATIC) == 0) {
2509 // Adjust the field type from byte to an unmanaged pointer.
2510 assert(fac_ptr->nonstatic_byte_count > 0, "");
2511 fac_ptr->nonstatic_byte_count -= 1;
2512 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset,
2513 word_sig_index);
2514 fac_ptr->nonstatic_word_count += 1;
2516 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset);
2517 assert(atype == NONSTATIC_BYTE, "");
2518 FieldAllocationType new_atype = NONSTATIC_WORD;
2519 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2521 found_vmentry = true;
2522 break;
2523 }
2524 }
2526 if (!found_vmentry)
2527 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2528 "missing vmentry byte field in java.dyn.MethodHandle");
2530 }
2533 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2534 Handle class_loader,
2535 Handle protection_domain,
2536 KlassHandle host_klass,
2537 GrowableArray<Handle>* cp_patches,
2538 symbolHandle& parsed_name,
2539 bool verify,
2540 TRAPS) {
2541 // So that JVMTI can cache class file in the state before retransformable agents
2542 // have modified it
2543 unsigned char *cached_class_file_bytes = NULL;
2544 jint cached_class_file_length;
2546 ClassFileStream* cfs = stream();
2547 // Timing
2548 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2549 JavaThread* jt = (JavaThread*) THREAD;
2551 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2552 ClassLoader::perf_class_parse_selftime(),
2553 NULL,
2554 jt->get_thread_stat()->perf_recursion_counts_addr(),
2555 jt->get_thread_stat()->perf_timers_addr(),
2556 PerfClassTraceTime::PARSE_CLASS);
2558 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2560 if (JvmtiExport::should_post_class_file_load_hook()) {
2561 unsigned char* ptr = cfs->buffer();
2562 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2564 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2565 &ptr, &end_ptr,
2566 &cached_class_file_bytes,
2567 &cached_class_file_length);
2569 if (ptr != cfs->buffer()) {
2570 // JVMTI agent has modified class file data.
2571 // Set new class file stream using JVMTI agent modified
2572 // class file data.
2573 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2574 set_stream(cfs);
2575 }
2576 }
2578 _host_klass = host_klass;
2579 _cp_patches = cp_patches;
2581 instanceKlassHandle nullHandle;
2583 // Figure out whether we can skip format checking (matching classic VM behavior)
2584 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2586 // Set the verify flag in stream
2587 cfs->set_verify(_need_verify);
2589 // Save the class file name for easier error message printing.
2590 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2592 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2593 // Magic value
2594 u4 magic = cfs->get_u4_fast();
2595 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2596 "Incompatible magic value %u in class file %s",
2597 magic, CHECK_(nullHandle));
2599 // Version numbers
2600 u2 minor_version = cfs->get_u2_fast();
2601 u2 major_version = cfs->get_u2_fast();
2603 // Check version numbers - we check this even with verifier off
2604 if (!is_supported_version(major_version, minor_version)) {
2605 if (name.is_null()) {
2606 Exceptions::fthrow(
2607 THREAD_AND_LOCATION,
2608 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2609 "Unsupported major.minor version %u.%u",
2610 major_version,
2611 minor_version);
2612 } else {
2613 ResourceMark rm(THREAD);
2614 Exceptions::fthrow(
2615 THREAD_AND_LOCATION,
2616 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2617 "%s : Unsupported major.minor version %u.%u",
2618 name->as_C_string(),
2619 major_version,
2620 minor_version);
2621 }
2622 return nullHandle;
2623 }
2625 _major_version = major_version;
2626 _minor_version = minor_version;
2629 // Check if verification needs to be relaxed for this class file
2630 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2631 _relax_verify = Verifier::relax_verify_for(class_loader());
2633 // Constant pool
2634 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2635 int cp_size = cp->length();
2637 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2639 // Access flags
2640 AccessFlags access_flags;
2641 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2643 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2644 // Set abstract bit for old class files for backward compatibility
2645 flags |= JVM_ACC_ABSTRACT;
2646 }
2647 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2648 access_flags.set_flags(flags);
2650 // This class and superclass
2651 instanceKlassHandle super_klass;
2652 u2 this_class_index = cfs->get_u2_fast();
2653 check_property(
2654 valid_cp_range(this_class_index, cp_size) &&
2655 cp->tag_at(this_class_index).is_unresolved_klass(),
2656 "Invalid this class index %u in constant pool in class file %s",
2657 this_class_index, CHECK_(nullHandle));
2659 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2660 assert(class_name.not_null(), "class_name can't be null");
2662 // It's important to set parsed_name *before* resolving the super class.
2663 // (it's used for cleanup by the caller if parsing fails)
2664 parsed_name = class_name;
2666 // Update _class_name which could be null previously to be class_name
2667 _class_name = class_name;
2669 // Don't need to check whether this class name is legal or not.
2670 // It has been checked when constant pool is parsed.
2671 // However, make sure it is not an array type.
2672 if (_need_verify) {
2673 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2674 "Bad class name in class file %s",
2675 CHECK_(nullHandle));
2676 }
2678 klassOop preserve_this_klass; // for storing result across HandleMark
2680 // release all handles when parsing is done
2681 { HandleMark hm(THREAD);
2683 // Checks if name in class file matches requested name
2684 if (name.not_null() && class_name() != name()) {
2685 ResourceMark rm(THREAD);
2686 Exceptions::fthrow(
2687 THREAD_AND_LOCATION,
2688 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2689 "%s (wrong name: %s)",
2690 name->as_C_string(),
2691 class_name->as_C_string()
2692 );
2693 return nullHandle;
2694 }
2696 if (TraceClassLoadingPreorder) {
2697 tty->print("[Loading %s", name()->as_klass_external_name());
2698 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2699 tty->print_cr("]");
2700 }
2702 u2 super_class_index = cfs->get_u2_fast();
2703 if (super_class_index == 0) {
2704 check_property(class_name() == vmSymbols::java_lang_Object(),
2705 "Invalid superclass index %u in class file %s",
2706 super_class_index,
2707 CHECK_(nullHandle));
2708 } else {
2709 check_property(valid_cp_range(super_class_index, cp_size) &&
2710 is_klass_reference(cp, super_class_index),
2711 "Invalid superclass index %u in class file %s",
2712 super_class_index,
2713 CHECK_(nullHandle));
2714 // The class name should be legal because it is checked when parsing constant pool.
2715 // However, make sure it is not an array type.
2716 bool is_array = false;
2717 if (cp->tag_at(super_class_index).is_klass()) {
2718 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2719 if (_need_verify)
2720 is_array = super_klass->oop_is_array();
2721 } else if (_need_verify) {
2722 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2723 }
2724 if (_need_verify) {
2725 guarantee_property(!is_array,
2726 "Bad superclass name in class file %s", CHECK_(nullHandle));
2727 }
2728 }
2730 // Interfaces
2731 u2 itfs_len = cfs->get_u2_fast();
2732 objArrayHandle local_interfaces;
2733 if (itfs_len == 0) {
2734 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2735 } else {
2736 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2737 }
2739 // Fields (offsets are filled in later)
2740 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2741 objArrayHandle fields_annotations;
2742 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2743 // Methods
2744 bool has_final_method = false;
2745 AccessFlags promoted_flags;
2746 promoted_flags.set_flags(0);
2747 // These need to be oop pointers because they are allocated lazily
2748 // inside parse_methods inside a nested HandleMark
2749 objArrayOop methods_annotations_oop = NULL;
2750 objArrayOop methods_parameter_annotations_oop = NULL;
2751 objArrayOop methods_default_annotations_oop = NULL;
2752 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2753 &promoted_flags,
2754 &has_final_method,
2755 &methods_annotations_oop,
2756 &methods_parameter_annotations_oop,
2757 &methods_default_annotations_oop,
2758 CHECK_(nullHandle));
2760 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2761 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2762 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2764 // We check super class after class file is parsed and format is checked
2765 if (super_class_index > 0 && super_klass.is_null()) {
2766 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2767 if (access_flags.is_interface()) {
2768 // Before attempting to resolve the superclass, check for class format
2769 // errors not checked yet.
2770 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2771 "Interfaces must have java.lang.Object as superclass in class file %s",
2772 CHECK_(nullHandle));
2773 }
2774 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2775 sk,
2776 class_loader,
2777 protection_domain,
2778 true,
2779 CHECK_(nullHandle));
2781 KlassHandle kh (THREAD, k);
2782 super_klass = instanceKlassHandle(THREAD, kh());
2783 if (LinkWellKnownClasses) // my super class is well known to me
2784 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2785 }
2786 if (super_klass.not_null()) {
2787 if (super_klass->is_interface()) {
2788 ResourceMark rm(THREAD);
2789 Exceptions::fthrow(
2790 THREAD_AND_LOCATION,
2791 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2792 "class %s has interface %s as super class",
2793 class_name->as_klass_external_name(),
2794 super_klass->external_name()
2795 );
2796 return nullHandle;
2797 }
2798 // Make sure super class is not final
2799 if (super_klass->is_final()) {
2800 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2801 }
2802 }
2804 // Compute the transitive list of all unique interfaces implemented by this class
2805 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2807 // sort methods
2808 typeArrayHandle method_ordering = sort_methods(methods,
2809 methods_annotations,
2810 methods_parameter_annotations,
2811 methods_default_annotations,
2812 CHECK_(nullHandle));
2814 // promote flags from parse_methods() to the klass' flags
2815 access_flags.add_promoted_flags(promoted_flags.as_int());
2817 // Size of Java vtable (in words)
2818 int vtable_size = 0;
2819 int itable_size = 0;
2820 int num_miranda_methods = 0;
2822 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2823 num_miranda_methods,
2824 super_klass(),
2825 methods(),
2826 access_flags,
2827 class_loader,
2828 class_name,
2829 local_interfaces(),
2830 CHECK_(nullHandle));
2832 // Size of Java itable (in words)
2833 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2835 // Field size and offset computation
2836 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2837 #ifndef PRODUCT
2838 int orig_nonstatic_field_size = 0;
2839 #endif
2840 int static_field_size = 0;
2841 int next_static_oop_offset;
2842 int next_static_double_offset;
2843 int next_static_word_offset;
2844 int next_static_short_offset;
2845 int next_static_byte_offset;
2846 int next_static_type_offset;
2847 int next_nonstatic_oop_offset;
2848 int next_nonstatic_double_offset;
2849 int next_nonstatic_word_offset;
2850 int next_nonstatic_short_offset;
2851 int next_nonstatic_byte_offset;
2852 int next_nonstatic_type_offset;
2853 int first_nonstatic_oop_offset;
2854 int first_nonstatic_field_offset;
2855 int next_nonstatic_field_offset;
2857 // Calculate the starting byte offsets
2858 next_static_oop_offset = (instanceKlass::header_size() +
2859 align_object_offset(vtable_size) +
2860 align_object_offset(itable_size)) * wordSize;
2861 next_static_double_offset = next_static_oop_offset +
2862 (fac.static_oop_count * heapOopSize);
2863 if ( fac.static_double_count &&
2864 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2865 Universe::field_type_should_be_aligned(T_LONG)) ) {
2866 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2867 }
2869 next_static_word_offset = next_static_double_offset +
2870 (fac.static_double_count * BytesPerLong);
2871 next_static_short_offset = next_static_word_offset +
2872 (fac.static_word_count * BytesPerInt);
2873 next_static_byte_offset = next_static_short_offset +
2874 (fac.static_short_count * BytesPerShort);
2875 next_static_type_offset = align_size_up((next_static_byte_offset +
2876 fac.static_byte_count ), wordSize );
2877 static_field_size = (next_static_type_offset -
2878 next_static_oop_offset) / wordSize;
2879 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
2880 nonstatic_field_size * heapOopSize;
2881 next_nonstatic_field_offset = first_nonstatic_field_offset;
2883 // Add fake fields for java.lang.Class instances (also see below)
2884 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2885 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2886 }
2888 // adjust the vmentry field declaration in java.dyn.MethodHandle
2889 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
2890 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
2891 }
2893 // Add a fake "discovered" field if it is not present
2894 // for compatibility with earlier jdk's.
2895 if (class_name() == vmSymbols::java_lang_ref_Reference()
2896 && class_loader.is_null()) {
2897 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2898 }
2899 // end of "discovered" field compactibility fix
2901 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
2902 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
2903 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
2904 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
2905 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
2907 bool super_has_nonstatic_fields =
2908 (super_klass() != NULL && super_klass->has_nonstatic_fields());
2909 bool has_nonstatic_fields = super_has_nonstatic_fields ||
2910 ((nonstatic_double_count + nonstatic_word_count +
2911 nonstatic_short_count + nonstatic_byte_count +
2912 nonstatic_oop_count) != 0);
2915 // Prepare list of oops for oop map generation.
2916 int* nonstatic_oop_offsets;
2917 unsigned int* nonstatic_oop_counts;
2918 unsigned int nonstatic_oop_map_count = 0;
2920 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2921 THREAD, int, nonstatic_oop_count + 1);
2922 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
2923 THREAD, unsigned int, nonstatic_oop_count + 1);
2925 // Add fake fields for java.lang.Class instances (also see above).
2926 // FieldsAllocationStyle and CompactFields values will be reset to default.
2927 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2928 java_lang_Class_fix_post(&next_nonstatic_field_offset);
2929 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
2930 const uint fake_oop_count = (next_nonstatic_field_offset -
2931 first_nonstatic_field_offset) / heapOopSize;
2932 nonstatic_oop_counts[0] = fake_oop_count;
2933 nonstatic_oop_map_count = 1;
2934 nonstatic_oop_count -= fake_oop_count;
2935 first_nonstatic_oop_offset = first_nonstatic_field_offset;
2936 } else {
2937 first_nonstatic_oop_offset = 0; // will be set for first oop field
2938 }
2940 #ifndef PRODUCT
2941 if( PrintCompactFieldsSavings ) {
2942 next_nonstatic_double_offset = next_nonstatic_field_offset +
2943 (nonstatic_oop_count * heapOopSize);
2944 if ( nonstatic_double_count > 0 ) {
2945 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2946 }
2947 next_nonstatic_word_offset = next_nonstatic_double_offset +
2948 (nonstatic_double_count * BytesPerLong);
2949 next_nonstatic_short_offset = next_nonstatic_word_offset +
2950 (nonstatic_word_count * BytesPerInt);
2951 next_nonstatic_byte_offset = next_nonstatic_short_offset +
2952 (nonstatic_short_count * BytesPerShort);
2953 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
2954 nonstatic_byte_count ), heapOopSize );
2955 orig_nonstatic_field_size = nonstatic_field_size +
2956 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
2957 }
2958 #endif
2959 bool compact_fields = CompactFields;
2960 int allocation_style = FieldsAllocationStyle;
2961 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
2962 assert(false, "0 <= FieldsAllocationStyle <= 2");
2963 allocation_style = 1; // Optimistic
2964 }
2966 // The next classes have predefined hard-coded fields offsets
2967 // (see in JavaClasses::compute_hard_coded_offsets()).
2968 // Use default fields allocation order for them.
2969 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2970 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2971 class_name() == vmSymbols::java_lang_Class() ||
2972 class_name() == vmSymbols::java_lang_ClassLoader() ||
2973 class_name() == vmSymbols::java_lang_ref_Reference() ||
2974 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2975 class_name() == vmSymbols::java_lang_StackTraceElement() ||
2976 class_name() == vmSymbols::java_lang_String() ||
2977 class_name() == vmSymbols::java_lang_Throwable() ||
2978 class_name() == vmSymbols::java_lang_Boolean() ||
2979 class_name() == vmSymbols::java_lang_Character() ||
2980 class_name() == vmSymbols::java_lang_Float() ||
2981 class_name() == vmSymbols::java_lang_Double() ||
2982 class_name() == vmSymbols::java_lang_Byte() ||
2983 class_name() == vmSymbols::java_lang_Short() ||
2984 class_name() == vmSymbols::java_lang_Integer() ||
2985 class_name() == vmSymbols::java_lang_Long())) {
2986 allocation_style = 0; // Allocate oops first
2987 compact_fields = false; // Don't compact fields
2988 }
2990 if( allocation_style == 0 ) {
2991 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2992 next_nonstatic_oop_offset = next_nonstatic_field_offset;
2993 next_nonstatic_double_offset = next_nonstatic_oop_offset +
2994 (nonstatic_oop_count * heapOopSize);
2995 } else if( allocation_style == 1 ) {
2996 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
2997 next_nonstatic_double_offset = next_nonstatic_field_offset;
2998 } else if( allocation_style == 2 ) {
2999 // Fields allocation: oops fields in super and sub classes are together.
3000 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3001 super_klass->nonstatic_oop_map_size() > 0 ) {
3002 int map_size = super_klass->nonstatic_oop_map_size();
3003 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3004 OopMapBlock* last_map = first_map + map_size - 1;
3005 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3006 if (next_offset == next_nonstatic_field_offset) {
3007 allocation_style = 0; // allocate oops first
3008 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3009 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3010 (nonstatic_oop_count * heapOopSize);
3011 }
3012 }
3013 if( allocation_style == 2 ) {
3014 allocation_style = 1; // allocate oops last
3015 next_nonstatic_double_offset = next_nonstatic_field_offset;
3016 }
3017 } else {
3018 ShouldNotReachHere();
3019 }
3021 int nonstatic_oop_space_count = 0;
3022 int nonstatic_word_space_count = 0;
3023 int nonstatic_short_space_count = 0;
3024 int nonstatic_byte_space_count = 0;
3025 int nonstatic_oop_space_offset;
3026 int nonstatic_word_space_offset;
3027 int nonstatic_short_space_offset;
3028 int nonstatic_byte_space_offset;
3030 if( nonstatic_double_count > 0 ) {
3031 int offset = next_nonstatic_double_offset;
3032 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3033 if( compact_fields && offset != next_nonstatic_double_offset ) {
3034 // Allocate available fields into the gap before double field.
3035 int length = next_nonstatic_double_offset - offset;
3036 assert(length == BytesPerInt, "");
3037 nonstatic_word_space_offset = offset;
3038 if( nonstatic_word_count > 0 ) {
3039 nonstatic_word_count -= 1;
3040 nonstatic_word_space_count = 1; // Only one will fit
3041 length -= BytesPerInt;
3042 offset += BytesPerInt;
3043 }
3044 nonstatic_short_space_offset = offset;
3045 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3046 nonstatic_short_count -= 1;
3047 nonstatic_short_space_count += 1;
3048 length -= BytesPerShort;
3049 offset += BytesPerShort;
3050 }
3051 nonstatic_byte_space_offset = offset;
3052 while( length > 0 && nonstatic_byte_count > 0 ) {
3053 nonstatic_byte_count -= 1;
3054 nonstatic_byte_space_count += 1;
3055 length -= 1;
3056 }
3057 // Allocate oop field in the gap if there are no other fields for that.
3058 nonstatic_oop_space_offset = offset;
3059 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3060 allocation_style != 0 ) { // when oop fields not first
3061 nonstatic_oop_count -= 1;
3062 nonstatic_oop_space_count = 1; // Only one will fit
3063 length -= heapOopSize;
3064 offset += heapOopSize;
3065 }
3066 }
3067 }
3069 next_nonstatic_word_offset = next_nonstatic_double_offset +
3070 (nonstatic_double_count * BytesPerLong);
3071 next_nonstatic_short_offset = next_nonstatic_word_offset +
3072 (nonstatic_word_count * BytesPerInt);
3073 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3074 (nonstatic_short_count * BytesPerShort);
3076 int notaligned_offset;
3077 if( allocation_style == 0 ) {
3078 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3079 } else { // allocation_style == 1
3080 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3081 if( nonstatic_oop_count > 0 ) {
3082 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3083 }
3084 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3085 }
3086 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3087 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3088 - first_nonstatic_field_offset)/heapOopSize);
3090 // Iterate over fields again and compute correct offsets.
3091 // The field allocation type was temporarily stored in the offset slot.
3092 // oop fields are located before non-oop fields (static and non-static).
3093 int len = fields->length();
3094 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3095 int real_offset;
3096 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3097 switch (atype) {
3098 case STATIC_OOP:
3099 real_offset = next_static_oop_offset;
3100 next_static_oop_offset += heapOopSize;
3101 break;
3102 case STATIC_BYTE:
3103 real_offset = next_static_byte_offset;
3104 next_static_byte_offset += 1;
3105 break;
3106 case STATIC_SHORT:
3107 real_offset = next_static_short_offset;
3108 next_static_short_offset += BytesPerShort;
3109 break;
3110 case STATIC_WORD:
3111 real_offset = next_static_word_offset;
3112 next_static_word_offset += BytesPerInt;
3113 break;
3114 case STATIC_ALIGNED_DOUBLE:
3115 case STATIC_DOUBLE:
3116 real_offset = next_static_double_offset;
3117 next_static_double_offset += BytesPerLong;
3118 break;
3119 case NONSTATIC_OOP:
3120 if( nonstatic_oop_space_count > 0 ) {
3121 real_offset = nonstatic_oop_space_offset;
3122 nonstatic_oop_space_offset += heapOopSize;
3123 nonstatic_oop_space_count -= 1;
3124 } else {
3125 real_offset = next_nonstatic_oop_offset;
3126 next_nonstatic_oop_offset += heapOopSize;
3127 }
3128 // Update oop maps
3129 if( nonstatic_oop_map_count > 0 &&
3130 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3131 real_offset -
3132 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3133 heapOopSize ) {
3134 // Extend current oop map
3135 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3136 } else {
3137 // Create new oop map
3138 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3139 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3140 nonstatic_oop_map_count += 1;
3141 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3142 first_nonstatic_oop_offset = real_offset;
3143 }
3144 }
3145 break;
3146 case NONSTATIC_BYTE:
3147 if( nonstatic_byte_space_count > 0 ) {
3148 real_offset = nonstatic_byte_space_offset;
3149 nonstatic_byte_space_offset += 1;
3150 nonstatic_byte_space_count -= 1;
3151 } else {
3152 real_offset = next_nonstatic_byte_offset;
3153 next_nonstatic_byte_offset += 1;
3154 }
3155 break;
3156 case NONSTATIC_SHORT:
3157 if( nonstatic_short_space_count > 0 ) {
3158 real_offset = nonstatic_short_space_offset;
3159 nonstatic_short_space_offset += BytesPerShort;
3160 nonstatic_short_space_count -= 1;
3161 } else {
3162 real_offset = next_nonstatic_short_offset;
3163 next_nonstatic_short_offset += BytesPerShort;
3164 }
3165 break;
3166 case NONSTATIC_WORD:
3167 if( nonstatic_word_space_count > 0 ) {
3168 real_offset = nonstatic_word_space_offset;
3169 nonstatic_word_space_offset += BytesPerInt;
3170 nonstatic_word_space_count -= 1;
3171 } else {
3172 real_offset = next_nonstatic_word_offset;
3173 next_nonstatic_word_offset += BytesPerInt;
3174 }
3175 break;
3176 case NONSTATIC_ALIGNED_DOUBLE:
3177 case NONSTATIC_DOUBLE:
3178 real_offset = next_nonstatic_double_offset;
3179 next_nonstatic_double_offset += BytesPerLong;
3180 break;
3181 default:
3182 ShouldNotReachHere();
3183 }
3184 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3185 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3186 }
3188 // Size of instances
3189 int instance_size;
3191 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3192 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3194 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3196 // Number of non-static oop map blocks allocated at end of klass.
3197 const unsigned int total_oop_map_count =
3198 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3199 first_nonstatic_oop_offset);
3201 // Compute reference type
3202 ReferenceType rt;
3203 if (super_klass() == NULL) {
3204 rt = REF_NONE;
3205 } else {
3206 rt = super_klass->reference_type();
3207 }
3209 // We can now create the basic klassOop for this klass
3210 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3211 static_field_size,
3212 total_oop_map_count,
3213 rt, CHECK_(nullHandle));
3214 instanceKlassHandle this_klass (THREAD, ik);
3216 assert(this_klass->static_field_size() == static_field_size, "sanity");
3217 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3218 "sanity");
3220 // Fill in information already parsed
3221 this_klass->set_access_flags(access_flags);
3222 this_klass->set_should_verify_class(verify);
3223 jint lh = Klass::instance_layout_helper(instance_size, false);
3224 this_klass->set_layout_helper(lh);
3225 assert(this_klass->oop_is_instance(), "layout is correct");
3226 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3227 // Not yet: supers are done below to support the new subtype-checking fields
3228 //this_klass->set_super(super_klass());
3229 this_klass->set_class_loader(class_loader());
3230 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3231 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3232 this_klass->set_static_oop_field_size(fac.static_oop_count);
3233 cp->set_pool_holder(this_klass());
3234 this_klass->set_constants(cp());
3235 this_klass->set_local_interfaces(local_interfaces());
3236 this_klass->set_fields(fields());
3237 this_klass->set_methods(methods());
3238 if (has_final_method) {
3239 this_klass->set_has_final_method();
3240 }
3241 this_klass->set_method_ordering(method_ordering());
3242 // The instanceKlass::_methods_jmethod_ids cache and the
3243 // instanceKlass::_methods_cached_itable_indices cache are
3244 // both managed on the assumption that the initial cache
3245 // size is equal to the number of methods in the class. If
3246 // that changes, then instanceKlass::idnum_can_increment()
3247 // has to be changed accordingly.
3248 this_klass->set_initial_method_idnum(methods->length());
3249 this_klass->set_name(cp->klass_name_at(this_class_index));
3250 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3251 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3252 this_klass->set_protection_domain(protection_domain());
3253 this_klass->set_fields_annotations(fields_annotations());
3254 this_klass->set_methods_annotations(methods_annotations());
3255 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3256 this_klass->set_methods_default_annotations(methods_default_annotations());
3258 this_klass->set_minor_version(minor_version);
3259 this_klass->set_major_version(major_version);
3261 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3262 // (We used to do this lazily, but now we query it in Rewriter,
3263 // which is eagerly done for every method, so we might as well do it now,
3264 // when everything is fresh in memory.)
3265 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3266 for (int j = 0; j < methods->length(); j++) {
3267 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3268 }
3269 }
3271 if (cached_class_file_bytes != NULL) {
3272 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3273 this_klass->set_cached_class_file(cached_class_file_bytes,
3274 cached_class_file_length);
3275 }
3277 // Miranda methods
3278 if ((num_miranda_methods > 0) ||
3279 // if this class introduced new miranda methods or
3280 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3281 // super class exists and this class inherited miranda methods
3282 ) {
3283 this_klass->set_has_miranda_methods(); // then set a flag
3284 }
3286 // Additional attributes
3287 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3289 // Make sure this is the end of class file stream
3290 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3292 // Initialize static fields
3293 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3295 // VerifyOops believes that once this has been set, the object is completely loaded.
3296 // Compute transitive closure of interfaces this class implements
3297 this_klass->set_transitive_interfaces(transitive_interfaces());
3299 // Fill in information needed to compute superclasses.
3300 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3302 // Initialize itable offset tables
3303 klassItable::setup_itable_offset_table(this_klass);
3305 // Do final class setup
3306 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3308 set_precomputed_flags(this_klass);
3310 // reinitialize modifiers, using the InnerClasses attribute
3311 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3312 this_klass->set_modifier_flags(computed_modifiers);
3314 // check if this class can access its super class
3315 check_super_class_access(this_klass, CHECK_(nullHandle));
3317 // check if this class can access its superinterfaces
3318 check_super_interface_access(this_klass, CHECK_(nullHandle));
3320 // check if this class overrides any final method
3321 check_final_method_override(this_klass, CHECK_(nullHandle));
3323 // check that if this class is an interface then it doesn't have static methods
3324 if (this_klass->is_interface()) {
3325 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3326 }
3328 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3329 false /* not shared class */);
3331 if (TraceClassLoading) {
3332 // print in a single call to reduce interleaving of output
3333 if (cfs->source() != NULL) {
3334 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3335 cfs->source());
3336 } else if (class_loader.is_null()) {
3337 if (THREAD->is_Java_thread()) {
3338 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3339 tty->print("[Loaded %s by instance of %s]\n",
3340 this_klass->external_name(),
3341 instanceKlass::cast(caller)->external_name());
3342 } else {
3343 tty->print("[Loaded %s]\n", this_klass->external_name());
3344 }
3345 } else {
3346 ResourceMark rm;
3347 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3348 instanceKlass::cast(class_loader->klass())->external_name());
3349 }
3350 }
3352 if (TraceClassResolution) {
3353 // print out the superclass.
3354 const char * from = Klass::cast(this_klass())->external_name();
3355 if (this_klass->java_super() != NULL) {
3356 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3357 }
3358 // print out each of the interface classes referred to by this class.
3359 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3360 if (!local_interfaces.is_null()) {
3361 int length = local_interfaces->length();
3362 for (int i = 0; i < length; i++) {
3363 klassOop k = klassOop(local_interfaces->obj_at(i));
3364 instanceKlass* to_class = instanceKlass::cast(k);
3365 const char * to = to_class->external_name();
3366 tty->print("RESOLVE %s %s (interface)\n", from, to);
3367 }
3368 }
3369 }
3371 #ifndef PRODUCT
3372 if( PrintCompactFieldsSavings ) {
3373 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3374 tty->print("[Saved %d of %d bytes in %s]\n",
3375 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3376 orig_nonstatic_field_size*heapOopSize,
3377 this_klass->external_name());
3378 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3379 tty->print("[Wasted %d over %d bytes in %s]\n",
3380 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3381 orig_nonstatic_field_size*heapOopSize,
3382 this_klass->external_name());
3383 }
3384 }
3385 #endif
3387 // preserve result across HandleMark
3388 preserve_this_klass = this_klass();
3389 }
3391 // Create new handle outside HandleMark
3392 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3393 debug_only(this_klass->as_klassOop()->verify();)
3395 return this_klass;
3396 }
3399 unsigned int
3400 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3401 unsigned int nonstatic_oop_map_count,
3402 int first_nonstatic_oop_offset) {
3403 unsigned int map_count =
3404 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3405 if (nonstatic_oop_map_count > 0) {
3406 // We have oops to add to map
3407 if (map_count == 0) {
3408 map_count = nonstatic_oop_map_count;
3409 } else {
3410 // Check whether we should add a new map block or whether the last one can
3411 // be extended
3412 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3413 OopMapBlock* const last_map = first_map + map_count - 1;
3415 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3416 if (next_offset == first_nonstatic_oop_offset) {
3417 // There is no gap bettwen superklass's last oop field and first
3418 // local oop field, merge maps.
3419 nonstatic_oop_map_count -= 1;
3420 } else {
3421 // Superklass didn't end with a oop field, add extra maps
3422 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3423 }
3424 map_count += nonstatic_oop_map_count;
3425 }
3426 }
3427 return map_count;
3428 }
3431 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3432 unsigned int nonstatic_oop_map_count,
3433 int* nonstatic_oop_offsets,
3434 unsigned int* nonstatic_oop_counts) {
3435 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3436 const instanceKlass* const super = k->superklass();
3437 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3438 if (super_count > 0) {
3439 // Copy maps from superklass
3440 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3441 for (unsigned int i = 0; i < super_count; ++i) {
3442 *this_oop_map++ = *super_oop_map++;
3443 }
3444 }
3446 if (nonstatic_oop_map_count > 0) {
3447 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3448 // The counts differ because there is no gap between superklass's last oop
3449 // field and the first local oop field. Extend the last oop map copied
3450 // from the superklass instead of creating new one.
3451 nonstatic_oop_map_count--;
3452 nonstatic_oop_offsets++;
3453 this_oop_map--;
3454 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3455 this_oop_map++;
3456 }
3458 // Add new map blocks, fill them
3459 while (nonstatic_oop_map_count-- > 0) {
3460 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3461 this_oop_map->set_count(*nonstatic_oop_counts++);
3462 this_oop_map++;
3463 }
3464 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3465 this_oop_map, "sanity");
3466 }
3467 }
3470 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3471 klassOop super = k->super();
3473 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3474 // in which case we don't have to register objects as finalizable
3475 if (!_has_empty_finalizer) {
3476 if (_has_finalizer ||
3477 (super != NULL && super->klass_part()->has_finalizer())) {
3478 k->set_has_finalizer();
3479 }
3480 }
3482 #ifdef ASSERT
3483 bool f = false;
3484 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3485 vmSymbols::void_method_signature());
3486 if (m != NULL && !m->is_empty_method()) {
3487 f = true;
3488 }
3489 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3490 #endif
3492 // Check if this klass supports the java.lang.Cloneable interface
3493 if (SystemDictionary::Cloneable_klass_loaded()) {
3494 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3495 k->set_is_cloneable();
3496 }
3497 }
3499 // Check if this klass has a vanilla default constructor
3500 if (super == NULL) {
3501 // java.lang.Object has empty default constructor
3502 k->set_has_vanilla_constructor();
3503 } else {
3504 if (Klass::cast(super)->has_vanilla_constructor() &&
3505 _has_vanilla_constructor) {
3506 k->set_has_vanilla_constructor();
3507 }
3508 #ifdef ASSERT
3509 bool v = false;
3510 if (Klass::cast(super)->has_vanilla_constructor()) {
3511 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3512 ), vmSymbols::void_method_signature());
3513 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3514 v = true;
3515 }
3516 }
3517 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3518 #endif
3519 }
3521 // If it cannot be fast-path allocated, set a bit in the layout helper.
3522 // See documentation of instanceKlass::can_be_fastpath_allocated().
3523 assert(k->size_helper() > 0, "layout_helper is initialized");
3524 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3525 || k->is_abstract() || k->is_interface()
3526 || (k->name() == vmSymbols::java_lang_Class()
3527 && k->class_loader() == NULL)
3528 || k->size_helper() >= FastAllocateSizeLimit) {
3529 // Forbid fast-path allocation.
3530 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3531 k->set_layout_helper(lh);
3532 }
3533 }
3536 // utility method for appending and array with check for duplicates
3538 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3539 // iterate over new interfaces
3540 for (int i = 0; i < ifs->length(); i++) {
3541 oop e = ifs->obj_at(i);
3542 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3543 // check for duplicates
3544 bool duplicate = false;
3545 for (int j = 0; j < index; j++) {
3546 if (result->obj_at(j) == e) {
3547 duplicate = true;
3548 break;
3549 }
3550 }
3551 // add new interface
3552 if (!duplicate) {
3553 result->obj_at_put(index++, e);
3554 }
3555 }
3556 }
3558 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3559 // Compute maximum size for transitive interfaces
3560 int max_transitive_size = 0;
3561 int super_size = 0;
3562 // Add superclass transitive interfaces size
3563 if (super.not_null()) {
3564 super_size = super->transitive_interfaces()->length();
3565 max_transitive_size += super_size;
3566 }
3567 // Add local interfaces' super interfaces
3568 int local_size = local_ifs->length();
3569 for (int i = 0; i < local_size; i++) {
3570 klassOop l = klassOop(local_ifs->obj_at(i));
3571 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3572 }
3573 // Finally add local interfaces
3574 max_transitive_size += local_size;
3575 // Construct array
3576 objArrayHandle result;
3577 if (max_transitive_size == 0) {
3578 // no interfaces, use canonicalized array
3579 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3580 } else if (max_transitive_size == super_size) {
3581 // no new local interfaces added, share superklass' transitive interface array
3582 result = objArrayHandle(THREAD, super->transitive_interfaces());
3583 } else if (max_transitive_size == local_size) {
3584 // only local interfaces added, share local interface array
3585 result = local_ifs;
3586 } else {
3587 objArrayHandle nullHandle;
3588 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3589 result = objArrayHandle(THREAD, new_objarray);
3590 int index = 0;
3591 // Copy down from superclass
3592 if (super.not_null()) {
3593 append_interfaces(result, index, super->transitive_interfaces());
3594 }
3595 // Copy down from local interfaces' superinterfaces
3596 for (int i = 0; i < local_ifs->length(); i++) {
3597 klassOop l = klassOop(local_ifs->obj_at(i));
3598 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3599 }
3600 // Finally add local interfaces
3601 append_interfaces(result, index, local_ifs());
3603 // Check if duplicates were removed
3604 if (index != max_transitive_size) {
3605 assert(index < max_transitive_size, "just checking");
3606 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3607 for (int i = 0; i < index; i++) {
3608 oop e = result->obj_at(i);
3609 assert(e != NULL, "just checking");
3610 new_result->obj_at_put(i, e);
3611 }
3612 result = objArrayHandle(THREAD, new_result);
3613 }
3614 }
3615 return result;
3616 }
3619 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3620 klassOop super = this_klass->super();
3621 if ((super != NULL) &&
3622 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3623 ResourceMark rm(THREAD);
3624 Exceptions::fthrow(
3625 THREAD_AND_LOCATION,
3626 vmSymbolHandles::java_lang_IllegalAccessError(),
3627 "class %s cannot access its superclass %s",
3628 this_klass->external_name(),
3629 instanceKlass::cast(super)->external_name()
3630 );
3631 return;
3632 }
3633 }
3636 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3637 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3638 int lng = local_interfaces->length();
3639 for (int i = lng - 1; i >= 0; i--) {
3640 klassOop k = klassOop(local_interfaces->obj_at(i));
3641 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3642 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3643 ResourceMark rm(THREAD);
3644 Exceptions::fthrow(
3645 THREAD_AND_LOCATION,
3646 vmSymbolHandles::java_lang_IllegalAccessError(),
3647 "class %s cannot access its superinterface %s",
3648 this_klass->external_name(),
3649 instanceKlass::cast(k)->external_name()
3650 );
3651 return;
3652 }
3653 }
3654 }
3657 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3658 objArrayHandle methods (THREAD, this_klass->methods());
3659 int num_methods = methods->length();
3661 // go thru each method and check if it overrides a final method
3662 for (int index = 0; index < num_methods; index++) {
3663 methodOop m = (methodOop)methods->obj_at(index);
3665 // skip private, static and <init> methods
3666 if ((!m->is_private()) &&
3667 (!m->is_static()) &&
3668 (m->name() != vmSymbols::object_initializer_name())) {
3670 symbolOop name = m->name();
3671 symbolOop signature = m->signature();
3672 klassOop k = this_klass->super();
3673 methodOop super_m = NULL;
3674 while (k != NULL) {
3675 // skip supers that don't have final methods.
3676 if (k->klass_part()->has_final_method()) {
3677 // lookup a matching method in the super class hierarchy
3678 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3679 if (super_m == NULL) {
3680 break; // didn't find any match; get out
3681 }
3683 if (super_m->is_final() &&
3684 // matching method in super is final
3685 (Reflection::verify_field_access(this_klass->as_klassOop(),
3686 super_m->method_holder(),
3687 super_m->method_holder(),
3688 super_m->access_flags(), false))
3689 // this class can access super final method and therefore override
3690 ) {
3691 ResourceMark rm(THREAD);
3692 Exceptions::fthrow(
3693 THREAD_AND_LOCATION,
3694 vmSymbolHandles::java_lang_VerifyError(),
3695 "class %s overrides final method %s.%s",
3696 this_klass->external_name(),
3697 name->as_C_string(),
3698 signature->as_C_string()
3699 );
3700 return;
3701 }
3703 // continue to look from super_m's holder's super.
3704 k = instanceKlass::cast(super_m->method_holder())->super();
3705 continue;
3706 }
3708 k = k->klass_part()->super();
3709 }
3710 }
3711 }
3712 }
3715 // assumes that this_klass is an interface
3716 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3717 assert(this_klass->is_interface(), "not an interface");
3718 objArrayHandle methods (THREAD, this_klass->methods());
3719 int num_methods = methods->length();
3721 for (int index = 0; index < num_methods; index++) {
3722 methodOop m = (methodOop)methods->obj_at(index);
3723 // if m is static and not the init method, throw a verify error
3724 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3725 ResourceMark rm(THREAD);
3726 Exceptions::fthrow(
3727 THREAD_AND_LOCATION,
3728 vmSymbolHandles::java_lang_VerifyError(),
3729 "Illegal static method %s in interface %s",
3730 m->name()->as_C_string(),
3731 this_klass->external_name()
3732 );
3733 return;
3734 }
3735 }
3736 }
3738 // utility methods for format checking
3740 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3741 if (!_need_verify) { return; }
3743 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3744 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3745 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3746 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3747 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3748 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3749 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3751 if ((is_abstract && is_final) ||
3752 (is_interface && !is_abstract) ||
3753 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3754 (!is_interface && major_gte_15 && is_annotation)) {
3755 ResourceMark rm(THREAD);
3756 Exceptions::fthrow(
3757 THREAD_AND_LOCATION,
3758 vmSymbolHandles::java_lang_ClassFormatError(),
3759 "Illegal class modifiers in class %s: 0x%X",
3760 _class_name->as_C_string(), flags
3761 );
3762 return;
3763 }
3764 }
3766 bool ClassFileParser::has_illegal_visibility(jint flags) {
3767 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3768 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3769 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3771 return ((is_public && is_protected) ||
3772 (is_public && is_private) ||
3773 (is_protected && is_private));
3774 }
3776 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3777 u2 max_version =
3778 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3779 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3780 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3781 (major <= max_version) &&
3782 ((major != max_version) ||
3783 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3784 }
3786 void ClassFileParser::verify_legal_field_modifiers(
3787 jint flags, bool is_interface, TRAPS) {
3788 if (!_need_verify) { return; }
3790 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3791 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3792 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3793 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3794 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3795 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3796 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3797 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3798 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3800 bool is_illegal = false;
3802 if (is_interface) {
3803 if (!is_public || !is_static || !is_final || is_private ||
3804 is_protected || is_volatile || is_transient ||
3805 (major_gte_15 && is_enum)) {
3806 is_illegal = true;
3807 }
3808 } else { // not interface
3809 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3810 is_illegal = true;
3811 }
3812 }
3814 if (is_illegal) {
3815 ResourceMark rm(THREAD);
3816 Exceptions::fthrow(
3817 THREAD_AND_LOCATION,
3818 vmSymbolHandles::java_lang_ClassFormatError(),
3819 "Illegal field modifiers in class %s: 0x%X",
3820 _class_name->as_C_string(), flags);
3821 return;
3822 }
3823 }
3825 void ClassFileParser::verify_legal_method_modifiers(
3826 jint flags, bool is_interface, symbolHandle name, TRAPS) {
3827 if (!_need_verify) { return; }
3829 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3830 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3831 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3832 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3833 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3834 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3835 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3836 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3837 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3838 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3839 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3841 bool is_illegal = false;
3843 if (is_interface) {
3844 if (!is_abstract || !is_public || is_static || is_final ||
3845 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3846 is_illegal = true;
3847 }
3848 } else { // not interface
3849 if (is_initializer) {
3850 if (is_static || is_final || is_synchronized || is_native ||
3851 is_abstract || (major_gte_15 && is_bridge)) {
3852 is_illegal = true;
3853 }
3854 } else { // not initializer
3855 if (is_abstract) {
3856 if ((is_final || is_native || is_private || is_static ||
3857 (major_gte_15 && (is_synchronized || is_strict)))) {
3858 is_illegal = true;
3859 }
3860 }
3861 if (has_illegal_visibility(flags)) {
3862 is_illegal = true;
3863 }
3864 }
3865 }
3867 if (is_illegal) {
3868 ResourceMark rm(THREAD);
3869 Exceptions::fthrow(
3870 THREAD_AND_LOCATION,
3871 vmSymbolHandles::java_lang_ClassFormatError(),
3872 "Method %s in class %s has illegal modifiers: 0x%X",
3873 name->as_C_string(), _class_name->as_C_string(), flags);
3874 return;
3875 }
3876 }
3878 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3879 assert(_need_verify, "only called when _need_verify is true");
3880 int i = 0;
3881 int count = length >> 2;
3882 for (int k=0; k<count; k++) {
3883 unsigned char b0 = buffer[i];
3884 unsigned char b1 = buffer[i+1];
3885 unsigned char b2 = buffer[i+2];
3886 unsigned char b3 = buffer[i+3];
3887 // For an unsigned char v,
3888 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3889 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3890 unsigned char res = b0 | b0 - 1 |
3891 b1 | b1 - 1 |
3892 b2 | b2 - 1 |
3893 b3 | b3 - 1;
3894 if (res >= 128) break;
3895 i += 4;
3896 }
3897 for(; i < length; i++) {
3898 unsigned short c;
3899 // no embedded zeros
3900 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3901 if(buffer[i] < 128) {
3902 continue;
3903 }
3904 if ((i + 5) < length) { // see if it's legal supplementary character
3905 if (UTF8::is_supplementary_character(&buffer[i])) {
3906 c = UTF8::get_supplementary_character(&buffer[i]);
3907 i += 5;
3908 continue;
3909 }
3910 }
3911 switch (buffer[i] >> 4) {
3912 default: break;
3913 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3914 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3915 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
3916 c = (buffer[i] & 0x1F) << 6;
3917 i++;
3918 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3919 c += buffer[i] & 0x3F;
3920 if (_major_version <= 47 || c == 0 || c >= 0x80) {
3921 // for classes with major > 47, c must a null or a character in its shortest form
3922 break;
3923 }
3924 }
3925 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3926 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
3927 c = (buffer[i] & 0xF) << 12;
3928 i += 2;
3929 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3930 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3931 if (_major_version <= 47 || c >= 0x800) {
3932 // for classes with major > 47, c must be in its shortest form
3933 break;
3934 }
3935 }
3936 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3937 } // end of switch
3938 } // end of for
3939 }
3941 // Checks if name is a legal class name.
3942 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3943 if (!_need_verify || _relax_verify) { return; }
3945 char buf[fixed_buffer_size];
3946 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3947 unsigned int length = name->utf8_length();
3948 bool legal = false;
3950 if (length > 0) {
3951 char* p;
3952 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3953 p = skip_over_field_signature(bytes, false, length, CHECK);
3954 legal = (p != NULL) && ((p - bytes) == (int)length);
3955 } else if (_major_version < JAVA_1_5_VERSION) {
3956 if (bytes[0] != '<') {
3957 p = skip_over_field_name(bytes, true, length);
3958 legal = (p != NULL) && ((p - bytes) == (int)length);
3959 }
3960 } else {
3961 // 4900761: relax the constraints based on JSR202 spec
3962 // Class names may be drawn from the entire Unicode character set.
3963 // Identifiers between '/' must be unqualified names.
3964 // The utf8 string has been verified when parsing cpool entries.
3965 legal = verify_unqualified_name(bytes, length, LegalClass);
3966 }
3967 }
3968 if (!legal) {
3969 ResourceMark rm(THREAD);
3970 Exceptions::fthrow(
3971 THREAD_AND_LOCATION,
3972 vmSymbolHandles::java_lang_ClassFormatError(),
3973 "Illegal class name \"%s\" in class file %s", bytes,
3974 _class_name->as_C_string()
3975 );
3976 return;
3977 }
3978 }
3980 // Checks if name is a legal field name.
3981 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3982 if (!_need_verify || _relax_verify) { return; }
3984 char buf[fixed_buffer_size];
3985 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3986 unsigned int length = name->utf8_length();
3987 bool legal = false;
3989 if (length > 0) {
3990 if (_major_version < JAVA_1_5_VERSION) {
3991 if (bytes[0] != '<') {
3992 char* p = skip_over_field_name(bytes, false, length);
3993 legal = (p != NULL) && ((p - bytes) == (int)length);
3994 }
3995 } else {
3996 // 4881221: relax the constraints based on JSR202 spec
3997 legal = verify_unqualified_name(bytes, length, LegalField);
3998 }
3999 }
4001 if (!legal) {
4002 ResourceMark rm(THREAD);
4003 Exceptions::fthrow(
4004 THREAD_AND_LOCATION,
4005 vmSymbolHandles::java_lang_ClassFormatError(),
4006 "Illegal field name \"%s\" in class %s", bytes,
4007 _class_name->as_C_string()
4008 );
4009 return;
4010 }
4011 }
4013 // Checks if name is a legal method name.
4014 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
4015 if (!_need_verify || _relax_verify) { return; }
4017 assert(!name.is_null(), "method name is null");
4018 char buf[fixed_buffer_size];
4019 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4020 unsigned int length = name->utf8_length();
4021 bool legal = false;
4023 if (length > 0) {
4024 if (bytes[0] == '<') {
4025 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4026 legal = true;
4027 }
4028 } else if (_major_version < JAVA_1_5_VERSION) {
4029 char* p;
4030 p = skip_over_field_name(bytes, false, length);
4031 legal = (p != NULL) && ((p - bytes) == (int)length);
4032 } else {
4033 // 4881221: relax the constraints based on JSR202 spec
4034 legal = verify_unqualified_name(bytes, length, LegalMethod);
4035 }
4036 }
4038 if (!legal) {
4039 ResourceMark rm(THREAD);
4040 Exceptions::fthrow(
4041 THREAD_AND_LOCATION,
4042 vmSymbolHandles::java_lang_ClassFormatError(),
4043 "Illegal method name \"%s\" in class %s", bytes,
4044 _class_name->as_C_string()
4045 );
4046 return;
4047 }
4048 }
4051 // Checks if signature is a legal field signature.
4052 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4053 if (!_need_verify) { return; }
4055 char buf[fixed_buffer_size];
4056 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4057 unsigned int length = signature->utf8_length();
4058 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4060 if (p == NULL || (p - bytes) != (int)length) {
4061 ResourceMark rm(THREAD);
4062 Exceptions::fthrow(
4063 THREAD_AND_LOCATION,
4064 vmSymbolHandles::java_lang_ClassFormatError(),
4065 "Field \"%s\" in class %s has illegal signature \"%s\"",
4066 name->as_C_string(), _class_name->as_C_string(), bytes
4067 );
4068 return;
4069 }
4070 }
4072 // Checks if signature is a legal method signature.
4073 // Returns number of parameters
4074 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4075 if (!_need_verify) {
4076 // make sure caller's args_size will be less than 0 even for non-static
4077 // method so it will be recomputed in compute_size_of_parameters().
4078 return -2;
4079 }
4081 unsigned int args_size = 0;
4082 char buf[fixed_buffer_size];
4083 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4084 unsigned int length = signature->utf8_length();
4085 char* nextp;
4087 // The first character must be a '('
4088 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4089 length--;
4090 // Skip over legal field signatures
4091 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4092 while ((length > 0) && (nextp != NULL)) {
4093 args_size++;
4094 if (p[0] == 'J' || p[0] == 'D') {
4095 args_size++;
4096 }
4097 length -= nextp - p;
4098 p = nextp;
4099 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4100 }
4101 // The first non-signature thing better be a ')'
4102 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4103 length--;
4104 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4105 // All internal methods must return void
4106 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4107 return args_size;
4108 }
4109 } else {
4110 // Now we better just have a return value
4111 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4112 if (nextp && ((int)length == (nextp - p))) {
4113 return args_size;
4114 }
4115 }
4116 }
4117 }
4118 // Report error
4119 ResourceMark rm(THREAD);
4120 Exceptions::fthrow(
4121 THREAD_AND_LOCATION,
4122 vmSymbolHandles::java_lang_ClassFormatError(),
4123 "Method \"%s\" in class %s has illegal signature \"%s\"",
4124 name->as_C_string(), _class_name->as_C_string(), p
4125 );
4126 return 0;
4127 }
4130 // Unqualified names may not contain the characters '.', ';', or '/'.
4131 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
4132 // Note that method names may not be <init> or <clinit> in this method.
4133 // Because these names have been checked as special cases before calling this method
4134 // in verify_legal_method_name.
4135 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
4136 jchar ch;
4138 for (char* p = name; p != name + length; ) {
4139 ch = *p;
4140 if (ch < 128) {
4141 p++;
4142 if (ch == '.' || ch == ';') {
4143 return false; // do not permit '.' or ';'
4144 }
4145 if (type != LegalClass && ch == '/') {
4146 return false; // do not permit '/' unless it's class name
4147 }
4148 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4149 return false; // do not permit '<' or '>' in method names
4150 }
4151 } else {
4152 char* tmp_p = UTF8::next(p, &ch);
4153 p = tmp_p;
4154 }
4155 }
4156 return true;
4157 }
4160 // Take pointer to a string. Skip over the longest part of the string that could
4161 // be taken as a fieldname. Allow '/' if slash_ok is true.
4162 // Return a pointer to just past the fieldname.
4163 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4164 // being true, we saw consecutive slashes (meaning we were looking for a
4165 // qualified path but found something that was badly-formed).
4166 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4167 char* p;
4168 jchar ch;
4169 jboolean last_is_slash = false;
4170 jboolean not_first_ch = false;
4172 for (p = name; p != name + length; not_first_ch = true) {
4173 char* old_p = p;
4174 ch = *p;
4175 if (ch < 128) {
4176 p++;
4177 // quick check for ascii
4178 if ((ch >= 'a' && ch <= 'z') ||
4179 (ch >= 'A' && ch <= 'Z') ||
4180 (ch == '_' || ch == '$') ||
4181 (not_first_ch && ch >= '0' && ch <= '9')) {
4182 last_is_slash = false;
4183 continue;
4184 }
4185 if (slash_ok && ch == '/') {
4186 if (last_is_slash) {
4187 return NULL; // Don't permit consecutive slashes
4188 }
4189 last_is_slash = true;
4190 continue;
4191 }
4192 } else {
4193 jint unicode_ch;
4194 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4195 p = tmp_p;
4196 last_is_slash = false;
4197 // Check if ch is Java identifier start or is Java identifier part
4198 // 4672820: call java.lang.Character methods directly without generating separate tables.
4199 EXCEPTION_MARK;
4200 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4202 // return value
4203 JavaValue result(T_BOOLEAN);
4204 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4205 JavaCallArguments args;
4206 args.push_int(unicode_ch);
4208 // public static boolean isJavaIdentifierStart(char ch);
4209 JavaCalls::call_static(&result,
4210 klass,
4211 vmSymbolHandles::isJavaIdentifierStart_name(),
4212 vmSymbolHandles::int_bool_signature(),
4213 &args,
4214 THREAD);
4216 if (HAS_PENDING_EXCEPTION) {
4217 CLEAR_PENDING_EXCEPTION;
4218 return 0;
4219 }
4220 if (result.get_jboolean()) {
4221 continue;
4222 }
4224 if (not_first_ch) {
4225 // public static boolean isJavaIdentifierPart(char ch);
4226 JavaCalls::call_static(&result,
4227 klass,
4228 vmSymbolHandles::isJavaIdentifierPart_name(),
4229 vmSymbolHandles::int_bool_signature(),
4230 &args,
4231 THREAD);
4233 if (HAS_PENDING_EXCEPTION) {
4234 CLEAR_PENDING_EXCEPTION;
4235 return 0;
4236 }
4238 if (result.get_jboolean()) {
4239 continue;
4240 }
4241 }
4242 }
4243 return (not_first_ch) ? old_p : NULL;
4244 }
4245 return (not_first_ch) ? p : NULL;
4246 }
4249 // Take pointer to a string. Skip over the longest part of the string that could
4250 // be taken as a field signature. Allow "void" if void_ok.
4251 // Return a pointer to just past the signature.
4252 // Return NULL if no legal signature is found.
4253 char* ClassFileParser::skip_over_field_signature(char* signature,
4254 bool void_ok,
4255 unsigned int length,
4256 TRAPS) {
4257 unsigned int array_dim = 0;
4258 while (length > 0) {
4259 switch (signature[0]) {
4260 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4261 case JVM_SIGNATURE_BOOLEAN:
4262 case JVM_SIGNATURE_BYTE:
4263 case JVM_SIGNATURE_CHAR:
4264 case JVM_SIGNATURE_SHORT:
4265 case JVM_SIGNATURE_INT:
4266 case JVM_SIGNATURE_FLOAT:
4267 case JVM_SIGNATURE_LONG:
4268 case JVM_SIGNATURE_DOUBLE:
4269 return signature + 1;
4270 case JVM_SIGNATURE_CLASS: {
4271 if (_major_version < JAVA_1_5_VERSION) {
4272 // Skip over the class name if one is there
4273 char* p = skip_over_field_name(signature + 1, true, --length);
4275 // The next character better be a semicolon
4276 if (p && (p - signature) > 1 && p[0] == ';') {
4277 return p + 1;
4278 }
4279 } else {
4280 // 4900761: For class version > 48, any unicode is allowed in class name.
4281 length--;
4282 signature++;
4283 while (length > 0 && signature[0] != ';') {
4284 if (signature[0] == '.') {
4285 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4286 }
4287 length--;
4288 signature++;
4289 }
4290 if (signature[0] == ';') { return signature + 1; }
4291 }
4293 return NULL;
4294 }
4295 case JVM_SIGNATURE_ARRAY:
4296 array_dim++;
4297 if (array_dim > 255) {
4298 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4299 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4300 }
4301 // The rest of what's there better be a legal signature
4302 signature++;
4303 length--;
4304 void_ok = false;
4305 break;
4307 default:
4308 return NULL;
4309 }
4310 }
4311 return NULL;
4312 }
