Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/classfile/classFileParser.cpp@6412b3805cd6
src/share/vm/classfile/classFileParser.cpp
Tue, 26 Oct 2010 14:08:49 -0400
- author
- kamg
- date
- Tue, 26 Oct 2010 14:08:49 -0400
- changeset 2236
- 6412b3805cd6
- parent 2202
- a932f331ef90
- child 2277
- 5caa30ea147b
- permissions
- -rw-r--r--
6891959: HotSpot should not throw ClassFormatError if a class has a field with '>' and/or '<' in its name
Summary: Class file parser needs to look for and disallow '[' in names.
Reviewed-by: coleenp, never
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
29 // allocating temporary data structures and copying the bytes twice. A
30 // temporary area is only needed when parsing utf8 entries in the constant
31 // pool and when parsing line number 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
50 // Used for backward compatibility reasons:
51 // - to check NameAndType_info signatures more aggressively
52 #define JAVA_7_VERSION 51
55 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
56 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
57 // this function (_current can be allocated in a register, with scalar
58 // replacement of aggregates). The _current pointer is copied back to
59 // stream() when this function returns. DON'T call another method within
60 // this method that uses stream().
61 ClassFileStream* cfs0 = stream();
62 ClassFileStream cfs1 = *cfs0;
63 ClassFileStream* cfs = &cfs1;
64 #ifdef ASSERT
65 assert(cfs->allocated_on_stack(),"should be local");
66 u1* old_current = cfs0->current();
67 #endif
69 // Used for batching symbol allocations.
70 const char* names[SymbolTable::symbol_alloc_batch_size];
71 int lengths[SymbolTable::symbol_alloc_batch_size];
72 int indices[SymbolTable::symbol_alloc_batch_size];
73 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
74 int names_count = 0;
76 // parsing Index 0 is unused
77 for (int index = 1; index < length; index++) {
78 // Each of the following case guarantees one more byte in the stream
79 // for the following tag or the access_flags following constant pool,
80 // so we don't need bounds-check for reading tag.
81 u1 tag = cfs->get_u1_fast();
82 switch (tag) {
83 case JVM_CONSTANT_Class :
84 {
85 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
86 u2 name_index = cfs->get_u2_fast();
87 cp->klass_index_at_put(index, name_index);
88 }
89 break;
90 case JVM_CONSTANT_Fieldref :
91 {
92 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
93 u2 class_index = cfs->get_u2_fast();
94 u2 name_and_type_index = cfs->get_u2_fast();
95 cp->field_at_put(index, class_index, name_and_type_index);
96 }
97 break;
98 case JVM_CONSTANT_Methodref :
99 {
100 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
101 u2 class_index = cfs->get_u2_fast();
102 u2 name_and_type_index = cfs->get_u2_fast();
103 cp->method_at_put(index, class_index, name_and_type_index);
104 }
105 break;
106 case JVM_CONSTANT_InterfaceMethodref :
107 {
108 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
109 u2 class_index = cfs->get_u2_fast();
110 u2 name_and_type_index = cfs->get_u2_fast();
111 cp->interface_method_at_put(index, class_index, name_and_type_index);
112 }
113 break;
114 case JVM_CONSTANT_String :
115 {
116 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
117 u2 string_index = cfs->get_u2_fast();
118 cp->string_index_at_put(index, string_index);
119 }
120 break;
121 case JVM_CONSTANT_MethodHandle :
122 case JVM_CONSTANT_MethodType :
123 if (!EnableMethodHandles ||
124 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
125 classfile_parse_error(
126 (!EnableMethodHandles ?
127 "This JVM does not support constant tag %u in class file %s" :
128 "Class file version does not support constant tag %u in class file %s"),
129 tag, CHECK);
130 }
131 if (tag == JVM_CONSTANT_MethodHandle) {
132 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
133 u1 ref_kind = cfs->get_u1_fast();
134 u2 method_index = cfs->get_u2_fast();
135 cp->method_handle_index_at_put(index, ref_kind, method_index);
136 } else if (tag == JVM_CONSTANT_MethodType) {
137 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
138 u2 signature_index = cfs->get_u2_fast();
139 cp->method_type_index_at_put(index, signature_index);
140 } else {
141 ShouldNotReachHere();
142 }
143 break;
144 case JVM_CONSTANT_InvokeDynamic :
145 {
146 if (!EnableInvokeDynamic ||
147 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
148 classfile_parse_error(
149 (!EnableInvokeDynamic ?
150 "This JVM does not support constant tag %u in class file %s" :
151 "Class file version does not support constant tag %u in class file %s"),
152 tag, CHECK);
153 }
154 cfs->guarantee_more(5, CHECK); // bsm_index, name_and_type_index, tag/access_flags
155 u2 bootstrap_method_index = cfs->get_u2_fast();
156 u2 name_and_type_index = cfs->get_u2_fast();
157 cp->invoke_dynamic_at_put(index, bootstrap_method_index, name_and_type_index);
158 }
159 break;
160 case JVM_CONSTANT_Integer :
161 {
162 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
163 u4 bytes = cfs->get_u4_fast();
164 cp->int_at_put(index, (jint) bytes);
165 }
166 break;
167 case JVM_CONSTANT_Float :
168 {
169 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
170 u4 bytes = cfs->get_u4_fast();
171 cp->float_at_put(index, *(jfloat*)&bytes);
172 }
173 break;
174 case JVM_CONSTANT_Long :
175 // A mangled type might cause you to overrun allocated memory
176 guarantee_property(index+1 < length,
177 "Invalid constant pool entry %u in class file %s",
178 index, CHECK);
179 {
180 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
181 u8 bytes = cfs->get_u8_fast();
182 cp->long_at_put(index, bytes);
183 }
184 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
185 break;
186 case JVM_CONSTANT_Double :
187 // A mangled type might cause you to overrun allocated memory
188 guarantee_property(index+1 < length,
189 "Invalid constant pool entry %u in class file %s",
190 index, CHECK);
191 {
192 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
193 u8 bytes = cfs->get_u8_fast();
194 cp->double_at_put(index, *(jdouble*)&bytes);
195 }
196 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
197 break;
198 case JVM_CONSTANT_NameAndType :
199 {
200 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
201 u2 name_index = cfs->get_u2_fast();
202 u2 signature_index = cfs->get_u2_fast();
203 cp->name_and_type_at_put(index, name_index, signature_index);
204 }
205 break;
206 case JVM_CONSTANT_Utf8 :
207 {
208 cfs->guarantee_more(2, CHECK); // utf8_length
209 u2 utf8_length = cfs->get_u2_fast();
210 u1* utf8_buffer = cfs->get_u1_buffer();
211 assert(utf8_buffer != NULL, "null utf8 buffer");
212 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
213 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
214 cfs->skip_u1_fast(utf8_length);
216 // Before storing the symbol, make sure it's legal
217 if (_need_verify) {
218 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
219 }
221 if (AnonymousClasses && has_cp_patch_at(index)) {
222 Handle patch = clear_cp_patch_at(index);
223 guarantee_property(java_lang_String::is_instance(patch()),
224 "Illegal utf8 patch at %d in class file %s",
225 index, CHECK);
226 char* str = java_lang_String::as_utf8_string(patch());
227 // (could use java_lang_String::as_symbol instead, but might as well batch them)
228 utf8_buffer = (u1*) str;
229 utf8_length = (int) strlen(str);
230 }
232 unsigned int hash;
233 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
234 if (result == NULL) {
235 names[names_count] = (char*)utf8_buffer;
236 lengths[names_count] = utf8_length;
237 indices[names_count] = index;
238 hashValues[names_count++] = hash;
239 if (names_count == SymbolTable::symbol_alloc_batch_size) {
240 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
241 names_count = 0;
242 }
243 } else {
244 cp->symbol_at_put(index, result);
245 }
246 }
247 break;
248 default:
249 classfile_parse_error(
250 "Unknown constant tag %u in class file %s", tag, CHECK);
251 break;
252 }
253 }
255 // Allocate the remaining symbols
256 if (names_count > 0) {
257 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
258 }
260 // Copy _current pointer of local copy back to stream().
261 #ifdef ASSERT
262 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
263 #endif
264 cfs0->set_current(cfs1.current());
265 }
267 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
269 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
270 ClassFileStream* cfs = stream();
271 constantPoolHandle nullHandle;
273 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
274 u2 length = cfs->get_u2_fast();
275 guarantee_property(
276 length >= 1, "Illegal constant pool size %u in class file %s",
277 length, CHECK_(nullHandle));
278 constantPoolOop constant_pool =
279 oopFactory::new_constantPool(length,
280 methodOopDesc::IsSafeConc,
281 CHECK_(nullHandle));
282 constantPoolHandle cp (THREAD, constant_pool);
284 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
286 // parsing constant pool entries
287 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
289 int index = 1; // declared outside of loops for portability
291 // first verification pass - validate cross references and fixup class and string constants
292 for (index = 1; index < length; index++) { // Index 0 is unused
293 switch (cp->tag_at(index).value()) {
294 case JVM_CONSTANT_Class :
295 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
296 break;
297 case JVM_CONSTANT_Fieldref :
298 // fall through
299 case JVM_CONSTANT_Methodref :
300 // fall through
301 case JVM_CONSTANT_InterfaceMethodref : {
302 if (!_need_verify) break;
303 int klass_ref_index = cp->klass_ref_index_at(index);
304 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
305 check_property(valid_cp_range(klass_ref_index, length) &&
306 is_klass_reference(cp, klass_ref_index),
307 "Invalid constant pool index %u in class file %s",
308 klass_ref_index,
309 CHECK_(nullHandle));
310 check_property(valid_cp_range(name_and_type_ref_index, length) &&
311 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
312 "Invalid constant pool index %u in class file %s",
313 name_and_type_ref_index,
314 CHECK_(nullHandle));
315 break;
316 }
317 case JVM_CONSTANT_String :
318 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
319 break;
320 case JVM_CONSTANT_Integer :
321 break;
322 case JVM_CONSTANT_Float :
323 break;
324 case JVM_CONSTANT_Long :
325 case JVM_CONSTANT_Double :
326 index++;
327 check_property(
328 (index < length && cp->tag_at(index).is_invalid()),
329 "Improper constant pool long/double index %u in class file %s",
330 index, CHECK_(nullHandle));
331 break;
332 case JVM_CONSTANT_NameAndType : {
333 if (!_need_verify) break;
334 int name_ref_index = cp->name_ref_index_at(index);
335 int signature_ref_index = cp->signature_ref_index_at(index);
336 check_property(
337 valid_cp_range(name_ref_index, length) &&
338 cp->tag_at(name_ref_index).is_utf8(),
339 "Invalid constant pool index %u in class file %s",
340 name_ref_index, CHECK_(nullHandle));
341 check_property(
342 valid_cp_range(signature_ref_index, length) &&
343 cp->tag_at(signature_ref_index).is_utf8(),
344 "Invalid constant pool index %u in class file %s",
345 signature_ref_index, CHECK_(nullHandle));
346 break;
347 }
348 case JVM_CONSTANT_Utf8 :
349 break;
350 case JVM_CONSTANT_UnresolvedClass : // fall-through
351 case JVM_CONSTANT_UnresolvedClassInError:
352 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
353 break;
354 case JVM_CONSTANT_ClassIndex :
355 {
356 int class_index = cp->klass_index_at(index);
357 check_property(
358 valid_cp_range(class_index, length) &&
359 cp->tag_at(class_index).is_utf8(),
360 "Invalid constant pool index %u in class file %s",
361 class_index, CHECK_(nullHandle));
362 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
363 }
364 break;
365 case JVM_CONSTANT_UnresolvedString :
366 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
367 break;
368 case JVM_CONSTANT_StringIndex :
369 {
370 int string_index = cp->string_index_at(index);
371 check_property(
372 valid_cp_range(string_index, length) &&
373 cp->tag_at(string_index).is_utf8(),
374 "Invalid constant pool index %u in class file %s",
375 string_index, CHECK_(nullHandle));
376 symbolOop sym = cp->symbol_at(string_index);
377 cp->unresolved_string_at_put(index, sym);
378 }
379 break;
380 case JVM_CONSTANT_MethodHandle :
381 {
382 int ref_index = cp->method_handle_index_at(index);
383 check_property(
384 valid_cp_range(ref_index, length) &&
385 EnableMethodHandles,
386 "Invalid constant pool index %u in class file %s",
387 ref_index, CHECK_(nullHandle));
388 constantTag tag = cp->tag_at(ref_index);
389 int ref_kind = cp->method_handle_ref_kind_at(index);
390 switch (ref_kind) {
391 case JVM_REF_getField:
392 case JVM_REF_getStatic:
393 case JVM_REF_putField:
394 case JVM_REF_putStatic:
395 check_property(
396 tag.is_field(),
397 "Invalid constant pool index %u in class file %s (not a field)",
398 ref_index, CHECK_(nullHandle));
399 break;
400 case JVM_REF_invokeVirtual:
401 case JVM_REF_invokeStatic:
402 case JVM_REF_invokeSpecial:
403 case JVM_REF_newInvokeSpecial:
404 check_property(
405 tag.is_method(),
406 "Invalid constant pool index %u in class file %s (not a method)",
407 ref_index, CHECK_(nullHandle));
408 break;
409 case JVM_REF_invokeInterface:
410 check_property(
411 tag.is_interface_method(),
412 "Invalid constant pool index %u in class file %s (not an interface method)",
413 ref_index, CHECK_(nullHandle));
414 break;
415 default:
416 classfile_parse_error(
417 "Bad method handle kind at constant pool index %u in class file %s",
418 index, CHECK_(nullHandle));
419 }
420 // Keep the ref_index unchanged. It will be indirected at link-time.
421 }
422 break;
423 case JVM_CONSTANT_MethodType :
424 {
425 int ref_index = cp->method_type_index_at(index);
426 check_property(
427 valid_cp_range(ref_index, length) &&
428 cp->tag_at(ref_index).is_utf8() &&
429 EnableMethodHandles,
430 "Invalid constant pool index %u in class file %s",
431 ref_index, CHECK_(nullHandle));
432 }
433 break;
434 case JVM_CONSTANT_InvokeDynamic :
435 {
436 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
437 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
438 check_property((bootstrap_method_ref_index == 0 && AllowTransitionalJSR292)
439 ||
440 (valid_cp_range(bootstrap_method_ref_index, length) &&
441 cp->tag_at(bootstrap_method_ref_index).is_method_handle()),
442 "Invalid constant pool index %u in class file %s",
443 bootstrap_method_ref_index,
444 CHECK_(nullHandle));
445 check_property(valid_cp_range(name_and_type_ref_index, length) &&
446 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
447 "Invalid constant pool index %u in class file %s",
448 name_and_type_ref_index,
449 CHECK_(nullHandle));
450 break;
451 }
452 default:
453 fatal(err_msg("bad constant pool tag value %u",
454 cp->tag_at(index).value()));
455 ShouldNotReachHere();
456 break;
457 } // end of switch
458 } // end of for
460 if (_cp_patches != NULL) {
461 // need to treat this_class specially...
462 assert(AnonymousClasses, "");
463 int this_class_index;
464 {
465 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
466 u1* mark = cfs->current();
467 u2 flags = cfs->get_u2_fast();
468 this_class_index = cfs->get_u2_fast();
469 cfs->set_current(mark); // revert to mark
470 }
472 for (index = 1; index < length; index++) { // Index 0 is unused
473 if (has_cp_patch_at(index)) {
474 guarantee_property(index != this_class_index,
475 "Illegal constant pool patch to self at %d in class file %s",
476 index, CHECK_(nullHandle));
477 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
478 }
479 }
480 // Ensure that all the patches have been used.
481 for (index = 0; index < _cp_patches->length(); index++) {
482 guarantee_property(!has_cp_patch_at(index),
483 "Unused constant pool patch at %d in class file %s",
484 index, CHECK_(nullHandle));
485 }
486 }
488 if (!_need_verify) {
489 return cp;
490 }
492 // second verification pass - checks the strings are of the right format.
493 // but not yet to the other entries
494 for (index = 1; index < length; index++) {
495 jbyte tag = cp->tag_at(index).value();
496 switch (tag) {
497 case JVM_CONSTANT_UnresolvedClass: {
498 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
499 // check the name, even if _cp_patches will overwrite it
500 verify_legal_class_name(class_name, CHECK_(nullHandle));
501 break;
502 }
503 case JVM_CONSTANT_NameAndType: {
504 if (_need_verify && _major_version >= JAVA_7_VERSION) {
505 int sig_index = cp->signature_ref_index_at(index);
506 int name_index = cp->name_ref_index_at(index);
507 symbolHandle name(THREAD, cp->symbol_at(name_index));
508 symbolHandle sig(THREAD, cp->symbol_at(sig_index));
509 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
510 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
511 } else {
512 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
513 }
514 }
515 break;
516 }
517 case JVM_CONSTANT_Fieldref:
518 case JVM_CONSTANT_Methodref:
519 case JVM_CONSTANT_InterfaceMethodref: {
520 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
521 // already verified to be utf8
522 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
523 // already verified to be utf8
524 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
525 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
526 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
527 if (tag == JVM_CONSTANT_Fieldref) {
528 verify_legal_field_name(name, CHECK_(nullHandle));
529 if (_need_verify && _major_version >= JAVA_7_VERSION) {
530 // Signature is verified above, when iterating NameAndType_info.
531 // Need only to be sure it's the right type.
532 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
533 throwIllegalSignature(
534 "Field", name, signature, CHECK_(nullHandle));
535 }
536 } else {
537 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
538 }
539 } else {
540 verify_legal_method_name(name, CHECK_(nullHandle));
541 if (_need_verify && _major_version >= JAVA_7_VERSION) {
542 // Signature is verified above, when iterating NameAndType_info.
543 // Need only to be sure it's the right type.
544 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
545 throwIllegalSignature(
546 "Method", name, signature, CHECK_(nullHandle));
547 }
548 } else {
549 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
550 }
551 if (tag == JVM_CONSTANT_Methodref) {
552 // 4509014: If a class method name begins with '<', it must be "<init>".
553 assert(!name.is_null(), "method name in constant pool is null");
554 unsigned int name_len = name->utf8_length();
555 assert(name_len > 0, "bad method name"); // already verified as legal name
556 if (name->byte_at(0) == '<') {
557 if (name() != vmSymbols::object_initializer_name()) {
558 classfile_parse_error(
559 "Bad method name at constant pool index %u in class file %s",
560 name_ref_index, CHECK_(nullHandle));
561 }
562 }
563 }
564 }
565 break;
566 }
567 case JVM_CONSTANT_MethodHandle: {
568 int ref_index = cp->method_handle_index_at(index);
569 int ref_kind = cp->method_handle_ref_kind_at(index);
570 switch (ref_kind) {
571 case JVM_REF_invokeVirtual:
572 case JVM_REF_invokeStatic:
573 case JVM_REF_invokeSpecial:
574 case JVM_REF_newInvokeSpecial:
575 {
576 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
577 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
578 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
579 if (ref_kind == JVM_REF_newInvokeSpecial) {
580 if (name() != vmSymbols::object_initializer_name()) {
581 classfile_parse_error(
582 "Bad constructor name at constant pool index %u in class file %s",
583 name_ref_index, CHECK_(nullHandle));
584 }
585 } else {
586 if (name() == vmSymbols::object_initializer_name()) {
587 classfile_parse_error(
588 "Bad method name at constant pool index %u in class file %s",
589 name_ref_index, CHECK_(nullHandle));
590 }
591 }
592 }
593 break;
594 // Other ref_kinds are already fully checked in previous pass.
595 }
596 break;
597 }
598 case JVM_CONSTANT_MethodType: {
599 symbolHandle no_name = vmSymbolHandles::type_name(); // place holder
600 symbolHandle signature(THREAD, cp->method_type_signature_at(index));
601 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
602 break;
603 }
604 } // end of switch
605 } // end of for
607 return cp;
608 }
611 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
612 assert(AnonymousClasses, "");
613 BasicType patch_type = T_VOID;
614 switch (cp->tag_at(index).value()) {
616 case JVM_CONSTANT_UnresolvedClass :
617 // Patching a class means pre-resolving it.
618 // The name in the constant pool is ignored.
619 if (java_lang_Class::is_instance(patch())) {
620 guarantee_property(!java_lang_Class::is_primitive(patch()),
621 "Illegal class patch at %d in class file %s",
622 index, CHECK);
623 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
624 } else {
625 guarantee_property(java_lang_String::is_instance(patch()),
626 "Illegal class patch at %d in class file %s",
627 index, CHECK);
628 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
629 cp->unresolved_klass_at_put(index, name());
630 }
631 break;
633 case JVM_CONSTANT_UnresolvedString :
634 // Patching a string means pre-resolving it.
635 // The spelling in the constant pool is ignored.
636 // The constant reference may be any object whatever.
637 // If it is not a real interned string, the constant is referred
638 // to as a "pseudo-string", and must be presented to the CP
639 // explicitly, because it may require scavenging.
640 cp->pseudo_string_at_put(index, patch());
641 break;
643 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
644 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
645 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
646 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
647 patch_prim:
648 {
649 jvalue value;
650 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
651 guarantee_property(value_type == patch_type,
652 "Illegal primitive patch at %d in class file %s",
653 index, CHECK);
654 switch (value_type) {
655 case T_INT: cp->int_at_put(index, value.i); break;
656 case T_FLOAT: cp->float_at_put(index, value.f); break;
657 case T_LONG: cp->long_at_put(index, value.j); break;
658 case T_DOUBLE: cp->double_at_put(index, value.d); break;
659 default: assert(false, "");
660 }
661 }
662 break;
664 default:
665 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
666 guarantee_property(!has_cp_patch_at(index),
667 "Illegal unexpected patch at %d in class file %s",
668 index, CHECK);
669 return;
670 }
672 // On fall-through, mark the patch as used.
673 clear_cp_patch_at(index);
674 }
678 class NameSigHash: public ResourceObj {
679 public:
680 symbolOop _name; // name
681 symbolOop _sig; // signature
682 NameSigHash* _next; // Next entry in hash table
683 };
686 #define HASH_ROW_SIZE 256
688 unsigned int hash(symbolOop name, symbolOop sig) {
689 unsigned int raw_hash = 0;
690 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
691 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
693 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
694 }
697 void initialize_hashtable(NameSigHash** table) {
698 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
699 }
701 // Return false if the name/sig combination is found in table.
702 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
703 // The old format checker uses heap sort to find duplicates.
704 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
705 // of table since we don't expect symbolOop's to move.
706 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
707 assert(name != NULL, "name in constant pool is NULL");
709 // First lookup for duplicates
710 int index = hash(name, sig);
711 NameSigHash* entry = table[index];
712 while (entry != NULL) {
713 if (entry->_name == name && entry->_sig == sig) {
714 return false;
715 }
716 entry = entry->_next;
717 }
719 // No duplicate is found, allocate a new entry and fill it.
720 entry = new NameSigHash();
721 entry->_name = name;
722 entry->_sig = sig;
724 // Insert into hash table
725 entry->_next = table[index];
726 table[index] = entry;
728 return true;
729 }
732 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
733 int length,
734 Handle class_loader,
735 Handle protection_domain,
736 symbolHandle class_name,
737 TRAPS) {
738 ClassFileStream* cfs = stream();
739 assert(length > 0, "only called for length>0");
740 objArrayHandle nullHandle;
741 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
742 objArrayHandle interfaces (THREAD, interface_oop);
744 int index;
745 for (index = 0; index < length; index++) {
746 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
747 KlassHandle interf;
748 check_property(
749 valid_cp_range(interface_index, cp->length()) &&
750 is_klass_reference(cp, interface_index),
751 "Interface name has bad constant pool index %u in class file %s",
752 interface_index, CHECK_(nullHandle));
753 if (cp->tag_at(interface_index).is_klass()) {
754 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
755 } else {
756 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
758 // Don't need to check legal name because it's checked when parsing constant pool.
759 // But need to make sure it's not an array type.
760 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
761 "Bad interface name in class file %s", CHECK_(nullHandle));
763 // Call resolve_super so classcircularity is checked
764 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
765 unresolved_klass, class_loader, protection_domain,
766 false, CHECK_(nullHandle));
767 interf = KlassHandle(THREAD, k);
769 if (LinkWellKnownClasses) // my super type is well known to me
770 cp->klass_at_put(interface_index, interf()); // eagerly resolve
771 }
773 if (!Klass::cast(interf())->is_interface()) {
774 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
775 }
776 interfaces->obj_at_put(index, interf());
777 }
779 if (!_need_verify || length <= 1) {
780 return interfaces;
781 }
783 // Check if there's any duplicates in interfaces
784 ResourceMark rm(THREAD);
785 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
786 THREAD, NameSigHash*, HASH_ROW_SIZE);
787 initialize_hashtable(interface_names);
788 bool dup = false;
789 {
790 debug_only(No_Safepoint_Verifier nsv;)
791 for (index = 0; index < length; index++) {
792 klassOop k = (klassOop)interfaces->obj_at(index);
793 symbolOop name = instanceKlass::cast(k)->name();
794 // If no duplicates, add (name, NULL) in hashtable interface_names.
795 if (!put_after_lookup(name, NULL, interface_names)) {
796 dup = true;
797 break;
798 }
799 }
800 }
801 if (dup) {
802 classfile_parse_error("Duplicate interface name in class file %s",
803 CHECK_(nullHandle));
804 }
806 return interfaces;
807 }
810 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
811 // Make sure the constant pool entry is of a type appropriate to this field
812 guarantee_property(
813 (constantvalue_index > 0 &&
814 constantvalue_index < cp->length()),
815 "Bad initial value index %u in ConstantValue attribute in class file %s",
816 constantvalue_index, CHECK);
817 constantTag value_type = cp->tag_at(constantvalue_index);
818 switch ( cp->basic_type_for_signature_at(signature_index) ) {
819 case T_LONG:
820 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
821 break;
822 case T_FLOAT:
823 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
824 break;
825 case T_DOUBLE:
826 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
827 break;
828 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
829 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
830 break;
831 case T_OBJECT:
832 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
833 && (value_type.is_string() || value_type.is_unresolved_string())),
834 "Bad string initial value in class file %s", CHECK);
835 break;
836 default:
837 classfile_parse_error(
838 "Unable to set initial value %u in class file %s",
839 constantvalue_index, CHECK);
840 }
841 }
844 // Parse attributes for a field.
845 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
846 u2 attributes_count,
847 bool is_static, u2 signature_index,
848 u2* constantvalue_index_addr,
849 bool* is_synthetic_addr,
850 u2* generic_signature_index_addr,
851 typeArrayHandle* field_annotations,
852 TRAPS) {
853 ClassFileStream* cfs = stream();
854 assert(attributes_count > 0, "length should be greater than 0");
855 u2 constantvalue_index = 0;
856 u2 generic_signature_index = 0;
857 bool is_synthetic = false;
858 u1* runtime_visible_annotations = NULL;
859 int runtime_visible_annotations_length = 0;
860 u1* runtime_invisible_annotations = NULL;
861 int runtime_invisible_annotations_length = 0;
862 while (attributes_count--) {
863 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
864 u2 attribute_name_index = cfs->get_u2_fast();
865 u4 attribute_length = cfs->get_u4_fast();
866 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
867 cp->tag_at(attribute_name_index).is_utf8(),
868 "Invalid field attribute index %u in class file %s",
869 attribute_name_index,
870 CHECK);
871 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
872 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
873 // ignore if non-static
874 if (constantvalue_index != 0) {
875 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
876 }
877 check_property(
878 attribute_length == 2,
879 "Invalid ConstantValue field attribute length %u in class file %s",
880 attribute_length, CHECK);
881 constantvalue_index = cfs->get_u2(CHECK);
882 if (_need_verify) {
883 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
884 }
885 } else if (attribute_name == vmSymbols::tag_synthetic()) {
886 if (attribute_length != 0) {
887 classfile_parse_error(
888 "Invalid Synthetic field attribute length %u in class file %s",
889 attribute_length, CHECK);
890 }
891 is_synthetic = true;
892 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
893 if (attribute_length != 0) {
894 classfile_parse_error(
895 "Invalid Deprecated field attribute length %u in class file %s",
896 attribute_length, CHECK);
897 }
898 } else if (_major_version >= JAVA_1_5_VERSION) {
899 if (attribute_name == vmSymbols::tag_signature()) {
900 if (attribute_length != 2) {
901 classfile_parse_error(
902 "Wrong size %u for field's Signature attribute in class file %s",
903 attribute_length, CHECK);
904 }
905 generic_signature_index = cfs->get_u2(CHECK);
906 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
907 runtime_visible_annotations_length = attribute_length;
908 runtime_visible_annotations = cfs->get_u1_buffer();
909 assert(runtime_visible_annotations != NULL, "null visible annotations");
910 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
911 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
912 runtime_invisible_annotations_length = attribute_length;
913 runtime_invisible_annotations = cfs->get_u1_buffer();
914 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
915 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
916 } else {
917 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
918 }
919 } else {
920 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
921 }
922 }
924 *constantvalue_index_addr = constantvalue_index;
925 *is_synthetic_addr = is_synthetic;
926 *generic_signature_index_addr = generic_signature_index;
927 *field_annotations = assemble_annotations(runtime_visible_annotations,
928 runtime_visible_annotations_length,
929 runtime_invisible_annotations,
930 runtime_invisible_annotations_length,
931 CHECK);
932 return;
933 }
936 // Field allocation types. Used for computing field offsets.
938 enum FieldAllocationType {
939 STATIC_OOP, // Oops
940 STATIC_BYTE, // Boolean, Byte, char
941 STATIC_SHORT, // shorts
942 STATIC_WORD, // ints
943 STATIC_DOUBLE, // long or double
944 STATIC_ALIGNED_DOUBLE,// aligned long or double
945 NONSTATIC_OOP,
946 NONSTATIC_BYTE,
947 NONSTATIC_SHORT,
948 NONSTATIC_WORD,
949 NONSTATIC_DOUBLE,
950 NONSTATIC_ALIGNED_DOUBLE
951 };
954 struct FieldAllocationCount {
955 unsigned int static_oop_count;
956 unsigned int static_byte_count;
957 unsigned int static_short_count;
958 unsigned int static_word_count;
959 unsigned int static_double_count;
960 unsigned int nonstatic_oop_count;
961 unsigned int nonstatic_byte_count;
962 unsigned int nonstatic_short_count;
963 unsigned int nonstatic_word_count;
964 unsigned int nonstatic_double_count;
965 };
967 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
968 struct FieldAllocationCount *fac,
969 objArrayHandle* fields_annotations, TRAPS) {
970 ClassFileStream* cfs = stream();
971 typeArrayHandle nullHandle;
972 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
973 u2 length = cfs->get_u2_fast();
974 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
975 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
976 typeArrayHandle fields(THREAD, new_fields);
978 int index = 0;
979 typeArrayHandle field_annotations;
980 for (int n = 0; n < length; n++) {
981 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
983 AccessFlags access_flags;
984 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
985 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
986 access_flags.set_flags(flags);
988 u2 name_index = cfs->get_u2_fast();
989 int cp_size = cp->length();
990 check_property(
991 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
992 "Invalid constant pool index %u for field name in class file %s",
993 name_index, CHECK_(nullHandle));
994 symbolHandle name(THREAD, cp->symbol_at(name_index));
995 verify_legal_field_name(name, CHECK_(nullHandle));
997 u2 signature_index = cfs->get_u2_fast();
998 check_property(
999 valid_cp_range(signature_index, cp_size) &&
1000 cp->tag_at(signature_index).is_utf8(),
1001 "Invalid constant pool index %u for field signature in class file %s",
1002 signature_index, CHECK_(nullHandle));
1003 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
1004 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1006 u2 constantvalue_index = 0;
1007 bool is_synthetic = false;
1008 u2 generic_signature_index = 0;
1009 bool is_static = access_flags.is_static();
1011 u2 attributes_count = cfs->get_u2_fast();
1012 if (attributes_count > 0) {
1013 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1014 &constantvalue_index, &is_synthetic,
1015 &generic_signature_index, &field_annotations,
1016 CHECK_(nullHandle));
1017 if (field_annotations.not_null()) {
1018 if (fields_annotations->is_null()) {
1019 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1020 *fields_annotations = objArrayHandle(THREAD, md);
1021 }
1022 (*fields_annotations)->obj_at_put(n, field_annotations());
1023 }
1024 if (is_synthetic) {
1025 access_flags.set_is_synthetic();
1026 }
1027 }
1029 fields->short_at_put(index++, access_flags.as_short());
1030 fields->short_at_put(index++, name_index);
1031 fields->short_at_put(index++, signature_index);
1032 fields->short_at_put(index++, constantvalue_index);
1034 // Remember how many oops we encountered and compute allocation type
1035 BasicType type = cp->basic_type_for_signature_at(signature_index);
1036 FieldAllocationType atype;
1037 if ( is_static ) {
1038 switch ( type ) {
1039 case T_BOOLEAN:
1040 case T_BYTE:
1041 fac->static_byte_count++;
1042 atype = STATIC_BYTE;
1043 break;
1044 case T_LONG:
1045 case T_DOUBLE:
1046 if (Universe::field_type_should_be_aligned(type)) {
1047 atype = STATIC_ALIGNED_DOUBLE;
1048 } else {
1049 atype = STATIC_DOUBLE;
1050 }
1051 fac->static_double_count++;
1052 break;
1053 case T_CHAR:
1054 case T_SHORT:
1055 fac->static_short_count++;
1056 atype = STATIC_SHORT;
1057 break;
1058 case T_FLOAT:
1059 case T_INT:
1060 fac->static_word_count++;
1061 atype = STATIC_WORD;
1062 break;
1063 case T_ARRAY:
1064 case T_OBJECT:
1065 fac->static_oop_count++;
1066 atype = STATIC_OOP;
1067 break;
1068 case T_ADDRESS:
1069 case T_VOID:
1070 default:
1071 assert(0, "bad field type");
1072 }
1073 } else {
1074 switch ( type ) {
1075 case T_BOOLEAN:
1076 case T_BYTE:
1077 fac->nonstatic_byte_count++;
1078 atype = NONSTATIC_BYTE;
1079 break;
1080 case T_LONG:
1081 case T_DOUBLE:
1082 if (Universe::field_type_should_be_aligned(type)) {
1083 atype = NONSTATIC_ALIGNED_DOUBLE;
1084 } else {
1085 atype = NONSTATIC_DOUBLE;
1086 }
1087 fac->nonstatic_double_count++;
1088 break;
1089 case T_CHAR:
1090 case T_SHORT:
1091 fac->nonstatic_short_count++;
1092 atype = NONSTATIC_SHORT;
1093 break;
1094 case T_FLOAT:
1095 case T_INT:
1096 fac->nonstatic_word_count++;
1097 atype = NONSTATIC_WORD;
1098 break;
1099 case T_ARRAY:
1100 case T_OBJECT:
1101 fac->nonstatic_oop_count++;
1102 atype = NONSTATIC_OOP;
1103 break;
1104 case T_ADDRESS:
1105 case T_VOID:
1106 default:
1107 assert(0, "bad field type");
1108 }
1109 }
1111 // The correct offset is computed later (all oop fields will be located together)
1112 // We temporarily store the allocation type in the offset field
1113 fields->short_at_put(index++, atype);
1114 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1115 fields->short_at_put(index++, generic_signature_index);
1116 }
1118 if (_need_verify && length > 1) {
1119 // Check duplicated fields
1120 ResourceMark rm(THREAD);
1121 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1122 THREAD, NameSigHash*, HASH_ROW_SIZE);
1123 initialize_hashtable(names_and_sigs);
1124 bool dup = false;
1125 {
1126 debug_only(No_Safepoint_Verifier nsv;)
1127 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1128 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1129 symbolOop name = cp->symbol_at(name_index);
1130 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1131 symbolOop sig = cp->symbol_at(sig_index);
1132 // If no duplicates, add name/signature in hashtable names_and_sigs.
1133 if (!put_after_lookup(name, sig, names_and_sigs)) {
1134 dup = true;
1135 break;
1136 }
1137 }
1138 }
1139 if (dup) {
1140 classfile_parse_error("Duplicate field name&signature in class file %s",
1141 CHECK_(nullHandle));
1142 }
1143 }
1145 return fields;
1146 }
1149 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1150 while (length-- > 0) {
1151 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1152 }
1153 }
1156 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1157 u4 exception_table_length,
1158 constantPoolHandle cp,
1159 TRAPS) {
1160 ClassFileStream* cfs = stream();
1161 typeArrayHandle nullHandle;
1163 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1164 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1165 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1167 int index = 0;
1168 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1169 for (unsigned int i = 0; i < exception_table_length; i++) {
1170 u2 start_pc = cfs->get_u2_fast();
1171 u2 end_pc = cfs->get_u2_fast();
1172 u2 handler_pc = cfs->get_u2_fast();
1173 u2 catch_type_index = cfs->get_u2_fast();
1174 // Will check legal target after parsing code array in verifier.
1175 if (_need_verify) {
1176 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1177 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1178 guarantee_property(handler_pc < code_length,
1179 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1180 if (catch_type_index != 0) {
1181 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1182 is_klass_reference(cp, catch_type_index),
1183 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1184 }
1185 }
1186 exception_handlers->int_at_put(index++, start_pc);
1187 exception_handlers->int_at_put(index++, end_pc);
1188 exception_handlers->int_at_put(index++, handler_pc);
1189 exception_handlers->int_at_put(index++, catch_type_index);
1190 }
1191 return exception_handlers;
1192 }
1194 void ClassFileParser::parse_linenumber_table(
1195 u4 code_attribute_length, u4 code_length,
1196 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1197 ClassFileStream* cfs = stream();
1198 unsigned int num_entries = cfs->get_u2(CHECK);
1200 // Each entry is a u2 start_pc, and a u2 line_number
1201 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1203 // Verify line number attribute and table length
1204 check_property(
1205 code_attribute_length == sizeof(u2) + length_in_bytes,
1206 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1208 cfs->guarantee_more(length_in_bytes, CHECK);
1210 if ((*write_stream) == NULL) {
1211 if (length_in_bytes > fixed_buffer_size) {
1212 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1213 } else {
1214 (*write_stream) = new CompressedLineNumberWriteStream(
1215 linenumbertable_buffer, fixed_buffer_size);
1216 }
1217 }
1219 while (num_entries-- > 0) {
1220 u2 bci = cfs->get_u2_fast(); // start_pc
1221 u2 line = cfs->get_u2_fast(); // line_number
1222 guarantee_property(bci < code_length,
1223 "Invalid pc in LineNumberTable in class file %s", CHECK);
1224 (*write_stream)->write_pair(bci, line);
1225 }
1226 }
1229 // Class file LocalVariableTable elements.
1230 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1231 public:
1232 u2 start_bci;
1233 u2 length;
1234 u2 name_cp_index;
1235 u2 descriptor_cp_index;
1236 u2 slot;
1237 };
1240 class LVT_Hash: public CHeapObj {
1241 public:
1242 LocalVariableTableElement *_elem; // element
1243 LVT_Hash* _next; // Next entry in hash table
1244 };
1246 unsigned int hash(LocalVariableTableElement *elem) {
1247 unsigned int raw_hash = elem->start_bci;
1249 raw_hash = elem->length + raw_hash * 37;
1250 raw_hash = elem->name_cp_index + raw_hash * 37;
1251 raw_hash = elem->slot + raw_hash * 37;
1253 return raw_hash % HASH_ROW_SIZE;
1254 }
1256 void initialize_hashtable(LVT_Hash** table) {
1257 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1258 table[i] = NULL;
1259 }
1260 }
1262 void clear_hashtable(LVT_Hash** table) {
1263 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1264 LVT_Hash* current = table[i];
1265 LVT_Hash* next;
1266 while (current != NULL) {
1267 next = current->_next;
1268 current->_next = NULL;
1269 delete(current);
1270 current = next;
1271 }
1272 table[i] = NULL;
1273 }
1274 }
1276 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1277 LVT_Hash* entry = table[index];
1279 /*
1280 * 3-tuple start_bci/length/slot has to be unique key,
1281 * so the following comparison seems to be redundant:
1282 * && elem->name_cp_index == entry->_elem->name_cp_index
1283 */
1284 while (entry != NULL) {
1285 if (elem->start_bci == entry->_elem->start_bci
1286 && elem->length == entry->_elem->length
1287 && elem->name_cp_index == entry->_elem->name_cp_index
1288 && elem->slot == entry->_elem->slot
1289 ) {
1290 return entry;
1291 }
1292 entry = entry->_next;
1293 }
1294 return NULL;
1295 }
1297 // Return false if the local variable is found in table.
1298 // Return true if no duplicate is found.
1299 // And local variable is added as a new entry in table.
1300 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1301 // First lookup for duplicates
1302 int index = hash(elem);
1303 LVT_Hash* entry = LVT_lookup(elem, index, table);
1305 if (entry != NULL) {
1306 return false;
1307 }
1308 // No duplicate is found, allocate a new entry and fill it.
1309 if ((entry = new LVT_Hash()) == NULL) {
1310 return false;
1311 }
1312 entry->_elem = elem;
1314 // Insert into hash table
1315 entry->_next = table[index];
1316 table[index] = entry;
1318 return true;
1319 }
1321 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1322 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1323 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1324 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1325 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1326 lvt->signature_cp_index = 0;
1327 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1328 }
1330 // Function is used to parse both attributes:
1331 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1332 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1333 u2 max_locals,
1334 u4 code_attribute_length,
1335 constantPoolHandle cp,
1336 u2* localvariable_table_length,
1337 bool isLVTT,
1338 TRAPS) {
1339 ClassFileStream* cfs = stream();
1340 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1341 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1342 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1343 // Verify local variable table attribute has right length
1344 if (_need_verify) {
1345 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1346 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1347 }
1348 u2* localvariable_table_start = cfs->get_u2_buffer();
1349 assert(localvariable_table_start != NULL, "null local variable table");
1350 if (!_need_verify) {
1351 cfs->skip_u2_fast(size);
1352 } else {
1353 cfs->guarantee_more(size * 2, CHECK_NULL);
1354 for(int i = 0; i < (*localvariable_table_length); i++) {
1355 u2 start_pc = cfs->get_u2_fast();
1356 u2 length = cfs->get_u2_fast();
1357 u2 name_index = cfs->get_u2_fast();
1358 u2 descriptor_index = cfs->get_u2_fast();
1359 u2 index = cfs->get_u2_fast();
1360 // Assign to a u4 to avoid overflow
1361 u4 end_pc = (u4)start_pc + (u4)length;
1363 if (start_pc >= code_length) {
1364 classfile_parse_error(
1365 "Invalid start_pc %u in %s in class file %s",
1366 start_pc, tbl_name, CHECK_NULL);
1367 }
1368 if (end_pc > code_length) {
1369 classfile_parse_error(
1370 "Invalid length %u in %s in class file %s",
1371 length, tbl_name, CHECK_NULL);
1372 }
1373 int cp_size = cp->length();
1374 guarantee_property(
1375 valid_cp_range(name_index, cp_size) &&
1376 cp->tag_at(name_index).is_utf8(),
1377 "Name index %u in %s has bad constant type in class file %s",
1378 name_index, tbl_name, CHECK_NULL);
1379 guarantee_property(
1380 valid_cp_range(descriptor_index, cp_size) &&
1381 cp->tag_at(descriptor_index).is_utf8(),
1382 "Signature index %u in %s has bad constant type in class file %s",
1383 descriptor_index, tbl_name, CHECK_NULL);
1385 symbolHandle name(THREAD, cp->symbol_at(name_index));
1386 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1387 verify_legal_field_name(name, CHECK_NULL);
1388 u2 extra_slot = 0;
1389 if (!isLVTT) {
1390 verify_legal_field_signature(name, sig, CHECK_NULL);
1392 // 4894874: check special cases for double and long local variables
1393 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1394 sig() == vmSymbols::type_signature(T_LONG)) {
1395 extra_slot = 1;
1396 }
1397 }
1398 guarantee_property((index + extra_slot) < max_locals,
1399 "Invalid index %u in %s in class file %s",
1400 index, tbl_name, CHECK_NULL);
1401 }
1402 }
1403 return localvariable_table_start;
1404 }
1407 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1408 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1409 ClassFileStream* cfs = stream();
1410 u2 index = 0; // index in the array with long/double occupying two slots
1411 u4 i1 = *u1_index;
1412 u4 i2 = *u2_index + 1;
1413 for(int i = 0; i < array_length; i++) {
1414 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1415 index++;
1416 if (tag == ITEM_Long || tag == ITEM_Double) {
1417 index++;
1418 } else if (tag == ITEM_Object) {
1419 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1420 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1421 is_klass_reference(cp, class_index),
1422 "Bad class index %u in StackMap in class file %s",
1423 class_index, CHECK);
1424 } else if (tag == ITEM_Uninitialized) {
1425 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1426 guarantee_property(
1427 offset < code_length,
1428 "Bad uninitialized type offset %u in StackMap in class file %s",
1429 offset, CHECK);
1430 } else {
1431 guarantee_property(
1432 tag <= (u1)ITEM_Uninitialized,
1433 "Unknown variable type %u in StackMap in class file %s",
1434 tag, CHECK);
1435 }
1436 }
1437 u2_array[*u2_index] = index;
1438 *u1_index = i1;
1439 *u2_index = i2;
1440 }
1442 typeArrayOop ClassFileParser::parse_stackmap_table(
1443 u4 code_attribute_length, TRAPS) {
1444 if (code_attribute_length == 0)
1445 return NULL;
1447 ClassFileStream* cfs = stream();
1448 u1* stackmap_table_start = cfs->get_u1_buffer();
1449 assert(stackmap_table_start != NULL, "null stackmap table");
1451 // check code_attribute_length first
1452 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1454 if (!_need_verify && !DumpSharedSpaces) {
1455 return NULL;
1456 }
1458 typeArrayOop stackmap_data =
1459 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1461 stackmap_data->set_length(code_attribute_length);
1462 memcpy((void*)stackmap_data->byte_at_addr(0),
1463 (void*)stackmap_table_start, code_attribute_length);
1464 return stackmap_data;
1465 }
1467 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1468 u4 method_attribute_length,
1469 constantPoolHandle cp, TRAPS) {
1470 ClassFileStream* cfs = stream();
1471 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1472 *checked_exceptions_length = cfs->get_u2_fast();
1473 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1474 u2* checked_exceptions_start = cfs->get_u2_buffer();
1475 assert(checked_exceptions_start != NULL, "null checked exceptions");
1476 if (!_need_verify) {
1477 cfs->skip_u2_fast(size);
1478 } else {
1479 // Verify each value in the checked exception table
1480 u2 checked_exception;
1481 u2 len = *checked_exceptions_length;
1482 cfs->guarantee_more(2 * len, CHECK_NULL);
1483 for (int i = 0; i < len; i++) {
1484 checked_exception = cfs->get_u2_fast();
1485 check_property(
1486 valid_cp_range(checked_exception, cp->length()) &&
1487 is_klass_reference(cp, checked_exception),
1488 "Exception name has bad type at constant pool %u in class file %s",
1489 checked_exception, CHECK_NULL);
1490 }
1491 }
1492 // check exceptions attribute length
1493 if (_need_verify) {
1494 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1495 sizeof(u2) * size),
1496 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1497 }
1498 return checked_exceptions_start;
1499 }
1501 void ClassFileParser::throwIllegalSignature(
1502 const char* type, symbolHandle name, symbolHandle sig, TRAPS) {
1503 ResourceMark rm(THREAD);
1504 Exceptions::fthrow(THREAD_AND_LOCATION,
1505 vmSymbols::java_lang_ClassFormatError(),
1506 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1507 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1508 }
1510 #define MAX_ARGS_SIZE 255
1511 #define MAX_CODE_SIZE 65535
1512 #define INITIAL_MAX_LVT_NUMBER 256
1514 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1515 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1516 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1517 // entire method attribute is parsed.
1518 //
1519 // The promoted_flags parameter is used to pass relevant access_flags
1520 // from the method back up to the containing klass. These flag values
1521 // are added to klass's access_flags.
1523 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1524 AccessFlags *promoted_flags,
1525 typeArrayHandle* method_annotations,
1526 typeArrayHandle* method_parameter_annotations,
1527 typeArrayHandle* method_default_annotations,
1528 TRAPS) {
1529 ClassFileStream* cfs = stream();
1530 methodHandle nullHandle;
1531 ResourceMark rm(THREAD);
1532 // Parse fixed parts
1533 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1535 int flags = cfs->get_u2_fast();
1536 u2 name_index = cfs->get_u2_fast();
1537 int cp_size = cp->length();
1538 check_property(
1539 valid_cp_range(name_index, cp_size) &&
1540 cp->tag_at(name_index).is_utf8(),
1541 "Illegal constant pool index %u for method name in class file %s",
1542 name_index, CHECK_(nullHandle));
1543 symbolHandle name(THREAD, cp->symbol_at(name_index));
1544 verify_legal_method_name(name, CHECK_(nullHandle));
1546 u2 signature_index = cfs->get_u2_fast();
1547 guarantee_property(
1548 valid_cp_range(signature_index, cp_size) &&
1549 cp->tag_at(signature_index).is_utf8(),
1550 "Illegal constant pool index %u for method signature in class file %s",
1551 signature_index, CHECK_(nullHandle));
1552 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1554 AccessFlags access_flags;
1555 if (name == vmSymbols::class_initializer_name()) {
1556 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1557 flags = JVM_ACC_STATIC;
1558 } else {
1559 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1560 }
1562 int args_size = -1; // only used when _need_verify is true
1563 if (_need_verify) {
1564 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1565 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1566 if (args_size > MAX_ARGS_SIZE) {
1567 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1568 }
1569 }
1571 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1573 // Default values for code and exceptions attribute elements
1574 u2 max_stack = 0;
1575 u2 max_locals = 0;
1576 u4 code_length = 0;
1577 u1* code_start = 0;
1578 u2 exception_table_length = 0;
1579 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1580 u2 checked_exceptions_length = 0;
1581 u2* checked_exceptions_start = NULL;
1582 CompressedLineNumberWriteStream* linenumber_table = NULL;
1583 int linenumber_table_length = 0;
1584 int total_lvt_length = 0;
1585 u2 lvt_cnt = 0;
1586 u2 lvtt_cnt = 0;
1587 bool lvt_allocated = false;
1588 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1589 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1590 u2* localvariable_table_length;
1591 u2** localvariable_table_start;
1592 u2* localvariable_type_table_length;
1593 u2** localvariable_type_table_start;
1594 bool parsed_code_attribute = false;
1595 bool parsed_checked_exceptions_attribute = false;
1596 bool parsed_stackmap_attribute = false;
1597 // stackmap attribute - JDK1.5
1598 typeArrayHandle stackmap_data;
1599 u2 generic_signature_index = 0;
1600 u1* runtime_visible_annotations = NULL;
1601 int runtime_visible_annotations_length = 0;
1602 u1* runtime_invisible_annotations = NULL;
1603 int runtime_invisible_annotations_length = 0;
1604 u1* runtime_visible_parameter_annotations = NULL;
1605 int runtime_visible_parameter_annotations_length = 0;
1606 u1* runtime_invisible_parameter_annotations = NULL;
1607 int runtime_invisible_parameter_annotations_length = 0;
1608 u1* annotation_default = NULL;
1609 int annotation_default_length = 0;
1611 // Parse code and exceptions attribute
1612 u2 method_attributes_count = cfs->get_u2_fast();
1613 while (method_attributes_count--) {
1614 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1615 u2 method_attribute_name_index = cfs->get_u2_fast();
1616 u4 method_attribute_length = cfs->get_u4_fast();
1617 check_property(
1618 valid_cp_range(method_attribute_name_index, cp_size) &&
1619 cp->tag_at(method_attribute_name_index).is_utf8(),
1620 "Invalid method attribute name index %u in class file %s",
1621 method_attribute_name_index, CHECK_(nullHandle));
1623 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1624 if (method_attribute_name == vmSymbols::tag_code()) {
1625 // Parse Code attribute
1626 if (_need_verify) {
1627 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1628 "Code attribute in native or abstract methods in class file %s",
1629 CHECK_(nullHandle));
1630 }
1631 if (parsed_code_attribute) {
1632 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1633 }
1634 parsed_code_attribute = true;
1636 // Stack size, locals size, and code size
1637 if (_major_version == 45 && _minor_version <= 2) {
1638 cfs->guarantee_more(4, CHECK_(nullHandle));
1639 max_stack = cfs->get_u1_fast();
1640 max_locals = cfs->get_u1_fast();
1641 code_length = cfs->get_u2_fast();
1642 } else {
1643 cfs->guarantee_more(8, CHECK_(nullHandle));
1644 max_stack = cfs->get_u2_fast();
1645 max_locals = cfs->get_u2_fast();
1646 code_length = cfs->get_u4_fast();
1647 }
1648 if (_need_verify) {
1649 guarantee_property(args_size <= max_locals,
1650 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1651 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1652 "Invalid method Code length %u in class file %s",
1653 code_length, CHECK_(nullHandle));
1654 }
1655 // Code pointer
1656 code_start = cfs->get_u1_buffer();
1657 assert(code_start != NULL, "null code start");
1658 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1659 cfs->skip_u1_fast(code_length);
1661 // Exception handler table
1662 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1663 exception_table_length = cfs->get_u2_fast();
1664 if (exception_table_length > 0) {
1665 exception_handlers =
1666 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1667 }
1669 // Parse additional attributes in code attribute
1670 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1671 u2 code_attributes_count = cfs->get_u2_fast();
1673 unsigned int calculated_attribute_length = 0;
1675 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1676 calculated_attribute_length =
1677 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1678 } else {
1679 // max_stack, locals and length are smaller in pre-version 45.2 classes
1680 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1681 }
1682 calculated_attribute_length +=
1683 code_length +
1684 sizeof(exception_table_length) +
1685 sizeof(code_attributes_count) +
1686 exception_table_length *
1687 ( sizeof(u2) + // start_pc
1688 sizeof(u2) + // end_pc
1689 sizeof(u2) + // handler_pc
1690 sizeof(u2) ); // catch_type_index
1692 while (code_attributes_count--) {
1693 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1694 u2 code_attribute_name_index = cfs->get_u2_fast();
1695 u4 code_attribute_length = cfs->get_u4_fast();
1696 calculated_attribute_length += code_attribute_length +
1697 sizeof(code_attribute_name_index) +
1698 sizeof(code_attribute_length);
1699 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1700 cp->tag_at(code_attribute_name_index).is_utf8(),
1701 "Invalid code attribute name index %u in class file %s",
1702 code_attribute_name_index,
1703 CHECK_(nullHandle));
1704 if (LoadLineNumberTables &&
1705 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1706 // Parse and compress line number table
1707 parse_linenumber_table(code_attribute_length, code_length,
1708 &linenumber_table, CHECK_(nullHandle));
1710 } else if (LoadLocalVariableTables &&
1711 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1712 // Parse local variable table
1713 if (!lvt_allocated) {
1714 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1715 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1716 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1717 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1718 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1719 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1720 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1721 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1722 lvt_allocated = true;
1723 }
1724 if (lvt_cnt == max_lvt_cnt) {
1725 max_lvt_cnt <<= 1;
1726 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1727 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1728 }
1729 localvariable_table_start[lvt_cnt] =
1730 parse_localvariable_table(code_length,
1731 max_locals,
1732 code_attribute_length,
1733 cp,
1734 &localvariable_table_length[lvt_cnt],
1735 false, // is not LVTT
1736 CHECK_(nullHandle));
1737 total_lvt_length += localvariable_table_length[lvt_cnt];
1738 lvt_cnt++;
1739 } else if (LoadLocalVariableTypeTables &&
1740 _major_version >= JAVA_1_5_VERSION &&
1741 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1742 if (!lvt_allocated) {
1743 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1744 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1745 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1746 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1747 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1748 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1749 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1750 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1751 lvt_allocated = true;
1752 }
1753 // Parse local variable type table
1754 if (lvtt_cnt == max_lvtt_cnt) {
1755 max_lvtt_cnt <<= 1;
1756 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1757 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1758 }
1759 localvariable_type_table_start[lvtt_cnt] =
1760 parse_localvariable_table(code_length,
1761 max_locals,
1762 code_attribute_length,
1763 cp,
1764 &localvariable_type_table_length[lvtt_cnt],
1765 true, // is LVTT
1766 CHECK_(nullHandle));
1767 lvtt_cnt++;
1768 } else if (UseSplitVerifier &&
1769 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1770 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1771 // Stack map is only needed by the new verifier in JDK1.5.
1772 if (parsed_stackmap_attribute) {
1773 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1774 }
1775 typeArrayOop sm =
1776 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1777 stackmap_data = typeArrayHandle(THREAD, sm);
1778 parsed_stackmap_attribute = true;
1779 } else {
1780 // Skip unknown attributes
1781 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1782 }
1783 }
1784 // check method attribute length
1785 if (_need_verify) {
1786 guarantee_property(method_attribute_length == calculated_attribute_length,
1787 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1788 }
1789 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1790 // Parse Exceptions attribute
1791 if (parsed_checked_exceptions_attribute) {
1792 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1793 }
1794 parsed_checked_exceptions_attribute = true;
1795 checked_exceptions_start =
1796 parse_checked_exceptions(&checked_exceptions_length,
1797 method_attribute_length,
1798 cp, CHECK_(nullHandle));
1799 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1800 if (method_attribute_length != 0) {
1801 classfile_parse_error(
1802 "Invalid Synthetic method attribute length %u in class file %s",
1803 method_attribute_length, CHECK_(nullHandle));
1804 }
1805 // Should we check that there hasn't already been a synthetic attribute?
1806 access_flags.set_is_synthetic();
1807 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1808 if (method_attribute_length != 0) {
1809 classfile_parse_error(
1810 "Invalid Deprecated method attribute length %u in class file %s",
1811 method_attribute_length, CHECK_(nullHandle));
1812 }
1813 } else if (_major_version >= JAVA_1_5_VERSION) {
1814 if (method_attribute_name == vmSymbols::tag_signature()) {
1815 if (method_attribute_length != 2) {
1816 classfile_parse_error(
1817 "Invalid Signature attribute length %u in class file %s",
1818 method_attribute_length, CHECK_(nullHandle));
1819 }
1820 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1821 generic_signature_index = cfs->get_u2_fast();
1822 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1823 runtime_visible_annotations_length = method_attribute_length;
1824 runtime_visible_annotations = cfs->get_u1_buffer();
1825 assert(runtime_visible_annotations != NULL, "null visible annotations");
1826 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1827 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1828 runtime_invisible_annotations_length = method_attribute_length;
1829 runtime_invisible_annotations = cfs->get_u1_buffer();
1830 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1831 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1832 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1833 runtime_visible_parameter_annotations_length = method_attribute_length;
1834 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1835 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1836 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1837 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1838 runtime_invisible_parameter_annotations_length = method_attribute_length;
1839 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1840 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1841 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1842 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1843 annotation_default_length = method_attribute_length;
1844 annotation_default = cfs->get_u1_buffer();
1845 assert(annotation_default != NULL, "null annotation default");
1846 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1847 } else {
1848 // Skip unknown attributes
1849 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1850 }
1851 } else {
1852 // Skip unknown attributes
1853 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1854 }
1855 }
1857 if (linenumber_table != NULL) {
1858 linenumber_table->write_terminator();
1859 linenumber_table_length = linenumber_table->position();
1860 }
1862 // Make sure there's at least one Code attribute in non-native/non-abstract method
1863 if (_need_verify) {
1864 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1865 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1866 }
1868 // All sizing information for a methodOop is finally available, now create it
1869 methodOop m_oop = oopFactory::new_method(
1870 code_length, access_flags, linenumber_table_length,
1871 total_lvt_length, checked_exceptions_length,
1872 methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1873 methodHandle m (THREAD, m_oop);
1875 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1877 // Fill in information from fixed part (access_flags already set)
1878 m->set_constants(cp());
1879 m->set_name_index(name_index);
1880 m->set_signature_index(signature_index);
1881 m->set_generic_signature_index(generic_signature_index);
1882 #ifdef CC_INTERP
1883 // hmm is there a gc issue here??
1884 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1885 m->set_result_index(rtf.type());
1886 #endif
1888 if (args_size >= 0) {
1889 m->set_size_of_parameters(args_size);
1890 } else {
1891 m->compute_size_of_parameters(THREAD);
1892 }
1893 #ifdef ASSERT
1894 if (args_size >= 0) {
1895 m->compute_size_of_parameters(THREAD);
1896 assert(args_size == m->size_of_parameters(), "");
1897 }
1898 #endif
1900 // Fill in code attribute information
1901 m->set_max_stack(max_stack);
1902 m->set_max_locals(max_locals);
1903 m->constMethod()->set_stackmap_data(stackmap_data());
1905 /**
1906 * The exception_table field is the flag used to indicate
1907 * that the methodOop and it's associated constMethodOop are partially
1908 * initialized and thus are exempt from pre/post GC verification. Once
1909 * the field is set, the oops are considered fully initialized so make
1910 * sure that the oops can pass verification when this field is set.
1911 */
1912 m->set_exception_table(exception_handlers());
1914 // Copy byte codes
1915 m->set_code(code_start);
1917 // Copy line number table
1918 if (linenumber_table != NULL) {
1919 memcpy(m->compressed_linenumber_table(),
1920 linenumber_table->buffer(), linenumber_table_length);
1921 }
1923 // Copy checked exceptions
1924 if (checked_exceptions_length > 0) {
1925 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1926 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1927 }
1929 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1930 *
1931 * Rules for LVT's and LVTT's are:
1932 * - There can be any number of LVT's and LVTT's.
1933 * - If there are n LVT's, it is the same as if there was just
1934 * one LVT containing all the entries from the n LVT's.
1935 * - There may be no more than one LVT entry per local variable.
1936 * Two LVT entries are 'equal' if these fields are the same:
1937 * start_pc, length, name, slot
1938 * - There may be no more than one LVTT entry per each LVT entry.
1939 * Each LVTT entry has to match some LVT entry.
1940 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1941 */
1942 if (total_lvt_length > 0) {
1943 int tbl_no, idx;
1945 promoted_flags->set_has_localvariable_table();
1947 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1948 initialize_hashtable(lvt_Hash);
1950 // To fill LocalVariableTable in
1951 Classfile_LVT_Element* cf_lvt;
1952 LocalVariableTableElement* lvt = m->localvariable_table_start();
1954 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1955 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1956 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1957 copy_lvt_element(&cf_lvt[idx], lvt);
1958 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1959 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1960 && _need_verify
1961 && _major_version >= JAVA_1_5_VERSION ) {
1962 clear_hashtable(lvt_Hash);
1963 classfile_parse_error("Duplicated LocalVariableTable attribute "
1964 "entry for '%s' in class file %s",
1965 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1966 CHECK_(nullHandle));
1967 }
1968 }
1969 }
1971 // To merge LocalVariableTable and LocalVariableTypeTable
1972 Classfile_LVT_Element* cf_lvtt;
1973 LocalVariableTableElement lvtt_elem;
1975 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1976 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1977 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1978 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1979 int index = hash(&lvtt_elem);
1980 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1981 if (entry == NULL) {
1982 if (_need_verify) {
1983 clear_hashtable(lvt_Hash);
1984 classfile_parse_error("LVTT entry for '%s' in class file %s "
1985 "does not match any LVT entry",
1986 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1987 CHECK_(nullHandle));
1988 }
1989 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1990 clear_hashtable(lvt_Hash);
1991 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1992 "entry for '%s' in class file %s",
1993 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1994 CHECK_(nullHandle));
1995 } else {
1996 // to add generic signatures into LocalVariableTable
1997 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1998 }
1999 }
2000 }
2001 clear_hashtable(lvt_Hash);
2002 }
2004 *method_annotations = assemble_annotations(runtime_visible_annotations,
2005 runtime_visible_annotations_length,
2006 runtime_invisible_annotations,
2007 runtime_invisible_annotations_length,
2008 CHECK_(nullHandle));
2009 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2010 runtime_visible_parameter_annotations_length,
2011 runtime_invisible_parameter_annotations,
2012 runtime_invisible_parameter_annotations_length,
2013 CHECK_(nullHandle));
2014 *method_default_annotations = assemble_annotations(annotation_default,
2015 annotation_default_length,
2016 NULL,
2017 0,
2018 CHECK_(nullHandle));
2020 if (name() == vmSymbols::finalize_method_name() &&
2021 signature() == vmSymbols::void_method_signature()) {
2022 if (m->is_empty_method()) {
2023 _has_empty_finalizer = true;
2024 } else {
2025 _has_finalizer = true;
2026 }
2027 }
2028 if (name() == vmSymbols::object_initializer_name() &&
2029 signature() == vmSymbols::void_method_signature() &&
2030 m->is_vanilla_constructor()) {
2031 _has_vanilla_constructor = true;
2032 }
2034 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2035 m->is_method_handle_adapter())) {
2036 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2037 "Method handle invokers must be defined internally to the VM", nullHandle);
2038 }
2040 return m;
2041 }
2044 // The promoted_flags parameter is used to pass relevant access_flags
2045 // from the methods back up to the containing klass. These flag values
2046 // are added to klass's access_flags.
2048 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2049 AccessFlags* promoted_flags,
2050 bool* has_final_method,
2051 objArrayOop* methods_annotations_oop,
2052 objArrayOop* methods_parameter_annotations_oop,
2053 objArrayOop* methods_default_annotations_oop,
2054 TRAPS) {
2055 ClassFileStream* cfs = stream();
2056 objArrayHandle nullHandle;
2057 typeArrayHandle method_annotations;
2058 typeArrayHandle method_parameter_annotations;
2059 typeArrayHandle method_default_annotations;
2060 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2061 u2 length = cfs->get_u2_fast();
2062 if (length == 0) {
2063 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2064 } else {
2065 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2066 objArrayHandle methods(THREAD, m);
2067 HandleMark hm(THREAD);
2068 objArrayHandle methods_annotations;
2069 objArrayHandle methods_parameter_annotations;
2070 objArrayHandle methods_default_annotations;
2071 for (int index = 0; index < length; index++) {
2072 methodHandle method = parse_method(cp, is_interface,
2073 promoted_flags,
2074 &method_annotations,
2075 &method_parameter_annotations,
2076 &method_default_annotations,
2077 CHECK_(nullHandle));
2078 if (method->is_final()) {
2079 *has_final_method = true;
2080 }
2081 methods->obj_at_put(index, method());
2082 if (method_annotations.not_null()) {
2083 if (methods_annotations.is_null()) {
2084 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2085 methods_annotations = objArrayHandle(THREAD, md);
2086 }
2087 methods_annotations->obj_at_put(index, method_annotations());
2088 }
2089 if (method_parameter_annotations.not_null()) {
2090 if (methods_parameter_annotations.is_null()) {
2091 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2092 methods_parameter_annotations = objArrayHandle(THREAD, md);
2093 }
2094 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2095 }
2096 if (method_default_annotations.not_null()) {
2097 if (methods_default_annotations.is_null()) {
2098 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2099 methods_default_annotations = objArrayHandle(THREAD, md);
2100 }
2101 methods_default_annotations->obj_at_put(index, method_default_annotations());
2102 }
2103 }
2104 if (_need_verify && length > 1) {
2105 // Check duplicated methods
2106 ResourceMark rm(THREAD);
2107 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2108 THREAD, NameSigHash*, HASH_ROW_SIZE);
2109 initialize_hashtable(names_and_sigs);
2110 bool dup = false;
2111 {
2112 debug_only(No_Safepoint_Verifier nsv;)
2113 for (int i = 0; i < length; i++) {
2114 methodOop m = (methodOop)methods->obj_at(i);
2115 // If no duplicates, add name/signature in hashtable names_and_sigs.
2116 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2117 dup = true;
2118 break;
2119 }
2120 }
2121 }
2122 if (dup) {
2123 classfile_parse_error("Duplicate method name&signature in class file %s",
2124 CHECK_(nullHandle));
2125 }
2126 }
2128 *methods_annotations_oop = methods_annotations();
2129 *methods_parameter_annotations_oop = methods_parameter_annotations();
2130 *methods_default_annotations_oop = methods_default_annotations();
2132 return methods;
2133 }
2134 }
2137 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2138 objArrayHandle methods_annotations,
2139 objArrayHandle methods_parameter_annotations,
2140 objArrayHandle methods_default_annotations,
2141 TRAPS) {
2142 typeArrayHandle nullHandle;
2143 int length = methods()->length();
2144 // If JVMTI original method ordering is enabled we have to
2145 // remember the original class file ordering.
2146 // We temporarily use the vtable_index field in the methodOop to store the
2147 // class file index, so we can read in after calling qsort.
2148 if (JvmtiExport::can_maintain_original_method_order()) {
2149 for (int index = 0; index < length; index++) {
2150 methodOop m = methodOop(methods->obj_at(index));
2151 assert(!m->valid_vtable_index(), "vtable index should not be set");
2152 m->set_vtable_index(index);
2153 }
2154 }
2155 // Sort method array by ascending method name (for faster lookups & vtable construction)
2156 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
2157 methodOopDesc::sort_methods(methods(),
2158 methods_annotations(),
2159 methods_parameter_annotations(),
2160 methods_default_annotations());
2162 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2163 if (JvmtiExport::can_maintain_original_method_order()) {
2164 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2165 typeArrayHandle method_ordering(THREAD, new_ordering);
2166 for (int index = 0; index < length; index++) {
2167 methodOop m = methodOop(methods->obj_at(index));
2168 int old_index = m->vtable_index();
2169 assert(old_index >= 0 && old_index < length, "invalid method index");
2170 method_ordering->int_at_put(index, old_index);
2171 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2172 }
2173 return method_ordering;
2174 } else {
2175 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2176 }
2177 }
2180 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2181 ClassFileStream* cfs = stream();
2182 cfs->guarantee_more(2, CHECK); // sourcefile_index
2183 u2 sourcefile_index = cfs->get_u2_fast();
2184 check_property(
2185 valid_cp_range(sourcefile_index, cp->length()) &&
2186 cp->tag_at(sourcefile_index).is_utf8(),
2187 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2188 sourcefile_index, CHECK);
2189 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2190 }
2194 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2195 instanceKlassHandle k,
2196 int length, TRAPS) {
2197 ClassFileStream* cfs = stream();
2198 u1* sde_buffer = cfs->get_u1_buffer();
2199 assert(sde_buffer != NULL, "null sde buffer");
2201 // Don't bother storing it if there is no way to retrieve it
2202 if (JvmtiExport::can_get_source_debug_extension()) {
2203 // Optimistically assume that only 1 byte UTF format is used
2204 // (common case)
2205 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2206 length, CHECK);
2207 k->set_source_debug_extension(sde_symbol);
2208 }
2209 // Got utf8 string, set stream position forward
2210 cfs->skip_u1(length, CHECK);
2211 }
2214 // Inner classes can be static, private or protected (classic VM does this)
2215 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2217 // Return number of classes in the inner classes attribute table
2218 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2219 ClassFileStream* cfs = stream();
2220 cfs->guarantee_more(2, CHECK_0); // length
2221 u2 length = cfs->get_u2_fast();
2223 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2224 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2225 typeArrayHandle inner_classes(THREAD, ic);
2226 int index = 0;
2227 int cp_size = cp->length();
2228 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2229 for (int n = 0; n < length; n++) {
2230 // Inner class index
2231 u2 inner_class_info_index = cfs->get_u2_fast();
2232 check_property(
2233 inner_class_info_index == 0 ||
2234 (valid_cp_range(inner_class_info_index, cp_size) &&
2235 is_klass_reference(cp, inner_class_info_index)),
2236 "inner_class_info_index %u has bad constant type in class file %s",
2237 inner_class_info_index, CHECK_0);
2238 // Outer class index
2239 u2 outer_class_info_index = cfs->get_u2_fast();
2240 check_property(
2241 outer_class_info_index == 0 ||
2242 (valid_cp_range(outer_class_info_index, cp_size) &&
2243 is_klass_reference(cp, outer_class_info_index)),
2244 "outer_class_info_index %u has bad constant type in class file %s",
2245 outer_class_info_index, CHECK_0);
2246 // Inner class name
2247 u2 inner_name_index = cfs->get_u2_fast();
2248 check_property(
2249 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2250 cp->tag_at(inner_name_index).is_utf8()),
2251 "inner_name_index %u has bad constant type in class file %s",
2252 inner_name_index, CHECK_0);
2253 if (_need_verify) {
2254 guarantee_property(inner_class_info_index != outer_class_info_index,
2255 "Class is both outer and inner class in class file %s", CHECK_0);
2256 }
2257 // Access flags
2258 AccessFlags inner_access_flags;
2259 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2260 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2261 // Set abstract bit for old class files for backward compatibility
2262 flags |= JVM_ACC_ABSTRACT;
2263 }
2264 verify_legal_class_modifiers(flags, CHECK_0);
2265 inner_access_flags.set_flags(flags);
2267 inner_classes->short_at_put(index++, inner_class_info_index);
2268 inner_classes->short_at_put(index++, outer_class_info_index);
2269 inner_classes->short_at_put(index++, inner_name_index);
2270 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2271 }
2273 // 4347400: make sure there's no duplicate entry in the classes array
2274 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2275 for(int i = 0; i < inner_classes->length(); i += 4) {
2276 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2277 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2278 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2279 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2280 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2281 "Duplicate entry in InnerClasses in class file %s",
2282 CHECK_0);
2283 }
2284 }
2285 }
2287 // Update instanceKlass with inner class info.
2288 k->set_inner_classes(inner_classes());
2289 return length;
2290 }
2292 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2293 k->set_is_synthetic();
2294 }
2296 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2297 ClassFileStream* cfs = stream();
2298 u2 signature_index = cfs->get_u2(CHECK);
2299 check_property(
2300 valid_cp_range(signature_index, cp->length()) &&
2301 cp->tag_at(signature_index).is_utf8(),
2302 "Invalid constant pool index %u in Signature attribute in class file %s",
2303 signature_index, CHECK);
2304 k->set_generic_signature(cp->symbol_at(signature_index));
2305 }
2307 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2308 ClassFileStream* cfs = stream();
2309 // Set inner classes attribute to default sentinel
2310 k->set_inner_classes(Universe::the_empty_short_array());
2311 cfs->guarantee_more(2, CHECK); // attributes_count
2312 u2 attributes_count = cfs->get_u2_fast();
2313 bool parsed_sourcefile_attribute = false;
2314 bool parsed_innerclasses_attribute = false;
2315 bool parsed_enclosingmethod_attribute = false;
2316 u1* runtime_visible_annotations = NULL;
2317 int runtime_visible_annotations_length = 0;
2318 u1* runtime_invisible_annotations = NULL;
2319 int runtime_invisible_annotations_length = 0;
2320 // Iterate over attributes
2321 while (attributes_count--) {
2322 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2323 u2 attribute_name_index = cfs->get_u2_fast();
2324 u4 attribute_length = cfs->get_u4_fast();
2325 check_property(
2326 valid_cp_range(attribute_name_index, cp->length()) &&
2327 cp->tag_at(attribute_name_index).is_utf8(),
2328 "Attribute name has bad constant pool index %u in class file %s",
2329 attribute_name_index, CHECK);
2330 symbolOop tag = cp->symbol_at(attribute_name_index);
2331 if (tag == vmSymbols::tag_source_file()) {
2332 // Check for SourceFile tag
2333 if (_need_verify) {
2334 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2335 }
2336 if (parsed_sourcefile_attribute) {
2337 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2338 } else {
2339 parsed_sourcefile_attribute = true;
2340 }
2341 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2342 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2343 // Check for SourceDebugExtension tag
2344 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2345 } else if (tag == vmSymbols::tag_inner_classes()) {
2346 // Check for InnerClasses tag
2347 if (parsed_innerclasses_attribute) {
2348 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2349 } else {
2350 parsed_innerclasses_attribute = true;
2351 }
2352 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2353 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2354 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2355 "Wrong InnerClasses attribute length in class file %s", CHECK);
2356 }
2357 } else if (tag == vmSymbols::tag_synthetic()) {
2358 // Check for Synthetic tag
2359 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2360 if (attribute_length != 0) {
2361 classfile_parse_error(
2362 "Invalid Synthetic classfile attribute length %u in class file %s",
2363 attribute_length, CHECK);
2364 }
2365 parse_classfile_synthetic_attribute(cp, k, CHECK);
2366 } else if (tag == vmSymbols::tag_deprecated()) {
2367 // Check for Deprecatd tag - 4276120
2368 if (attribute_length != 0) {
2369 classfile_parse_error(
2370 "Invalid Deprecated classfile attribute length %u in class file %s",
2371 attribute_length, CHECK);
2372 }
2373 } else if (_major_version >= JAVA_1_5_VERSION) {
2374 if (tag == vmSymbols::tag_signature()) {
2375 if (attribute_length != 2) {
2376 classfile_parse_error(
2377 "Wrong Signature attribute length %u in class file %s",
2378 attribute_length, CHECK);
2379 }
2380 parse_classfile_signature_attribute(cp, k, CHECK);
2381 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2382 runtime_visible_annotations_length = attribute_length;
2383 runtime_visible_annotations = cfs->get_u1_buffer();
2384 assert(runtime_visible_annotations != NULL, "null visible annotations");
2385 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2386 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2387 runtime_invisible_annotations_length = attribute_length;
2388 runtime_invisible_annotations = cfs->get_u1_buffer();
2389 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2390 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2391 } else if (tag == vmSymbols::tag_enclosing_method()) {
2392 if (parsed_enclosingmethod_attribute) {
2393 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2394 } else {
2395 parsed_enclosingmethod_attribute = true;
2396 }
2397 cfs->guarantee_more(4, CHECK); // class_index, method_index
2398 u2 class_index = cfs->get_u2_fast();
2399 u2 method_index = cfs->get_u2_fast();
2400 if (class_index == 0) {
2401 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2402 }
2403 // Validate the constant pool indices and types
2404 if (!cp->is_within_bounds(class_index) ||
2405 !is_klass_reference(cp, class_index)) {
2406 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2407 }
2408 if (method_index != 0 &&
2409 (!cp->is_within_bounds(method_index) ||
2410 !cp->tag_at(method_index).is_name_and_type())) {
2411 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2412 }
2413 k->set_enclosing_method_indices(class_index, method_index);
2414 } else {
2415 // Unknown attribute
2416 cfs->skip_u1(attribute_length, CHECK);
2417 }
2418 } else {
2419 // Unknown attribute
2420 cfs->skip_u1(attribute_length, CHECK);
2421 }
2422 }
2423 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2424 runtime_visible_annotations_length,
2425 runtime_invisible_annotations,
2426 runtime_invisible_annotations_length,
2427 CHECK);
2428 k->set_class_annotations(annotations());
2429 }
2432 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2433 int runtime_visible_annotations_length,
2434 u1* runtime_invisible_annotations,
2435 int runtime_invisible_annotations_length, TRAPS) {
2436 typeArrayHandle annotations;
2437 if (runtime_visible_annotations != NULL ||
2438 runtime_invisible_annotations != NULL) {
2439 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2440 runtime_invisible_annotations_length, CHECK_(annotations));
2441 annotations = typeArrayHandle(THREAD, anno);
2442 if (runtime_visible_annotations != NULL) {
2443 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2444 }
2445 if (runtime_invisible_annotations != NULL) {
2446 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2447 }
2448 }
2449 return annotations;
2450 }
2453 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2454 KlassHandle h_k (THREAD, fd->field_holder());
2455 assert(h_k.not_null() && fd->is_static(), "just checking");
2456 if (fd->has_initial_value()) {
2457 BasicType t = fd->field_type();
2458 switch (t) {
2459 case T_BYTE:
2460 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2461 break;
2462 case T_BOOLEAN:
2463 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2464 break;
2465 case T_CHAR:
2466 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2467 break;
2468 case T_SHORT:
2469 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2470 break;
2471 case T_INT:
2472 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2473 break;
2474 case T_FLOAT:
2475 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2476 break;
2477 case T_DOUBLE:
2478 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2479 break;
2480 case T_LONG:
2481 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2482 break;
2483 case T_OBJECT:
2484 {
2485 #ifdef ASSERT
2486 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2487 assert(fd->signature() == sym, "just checking");
2488 #endif
2489 oop string = fd->string_initial_value(CHECK);
2490 h_k()->obj_field_put(fd->offset(), string);
2491 }
2492 break;
2493 default:
2494 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2495 "Illegal ConstantValue attribute in class file");
2496 }
2497 }
2498 }
2501 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2502 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2503 // This code is for compatibility with earlier jdk's that do not
2504 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2505 // the check for the "discovered" field should issue a warning if
2506 // the field is not found. For 1.6 this code should be issue a
2507 // fatal error if the "discovered" field is not found.
2508 //
2509 // Increment fac.nonstatic_oop_count so that the start of the
2510 // next type of non-static oops leaves room for the fake oop.
2511 // Do not increment next_nonstatic_oop_offset so that the
2512 // fake oop is place after the java.lang.ref.Reference oop
2513 // fields.
2514 //
2515 // Check the fields in java.lang.ref.Reference for the "discovered"
2516 // field. If it is not present, artifically create a field for it.
2517 // This allows this VM to run on early JDK where the field is not
2518 // present.
2520 //
2521 // Increment fac.nonstatic_oop_count so that the start of the
2522 // next type of non-static oops leaves room for the fake oop.
2523 // Do not increment next_nonstatic_oop_offset so that the
2524 // fake oop is place after the java.lang.ref.Reference oop
2525 // fields.
2526 //
2527 // Check the fields in java.lang.ref.Reference for the "discovered"
2528 // field. If it is not present, artifically create a field for it.
2529 // This allows this VM to run on early JDK where the field is not
2530 // present.
2531 int reference_sig_index = 0;
2532 int reference_name_index = 0;
2533 int reference_index = 0;
2534 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2535 const int n = (*fields_ptr)()->length();
2536 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2537 int name_index =
2538 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2539 int sig_index =
2540 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2541 symbolOop f_name = cp->symbol_at(name_index);
2542 symbolOop f_sig = cp->symbol_at(sig_index);
2543 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2544 // Save the index for reference signature for later use.
2545 // The fake discovered field does not entries in the
2546 // constant pool so the index for its signature cannot
2547 // be extracted from the constant pool. It will need
2548 // later, however. It's signature is vmSymbols::reference_signature()
2549 // so same an index for that signature.
2550 reference_sig_index = sig_index;
2551 reference_name_index = name_index;
2552 reference_index = i;
2553 }
2554 if (f_name == vmSymbols::reference_discovered_name() &&
2555 f_sig == vmSymbols::reference_signature()) {
2556 // The values below are fake but will force extra
2557 // non-static oop fields and a corresponding non-static
2558 // oop map block to be allocated.
2559 extra = 0;
2560 break;
2561 }
2562 }
2563 if (extra != 0) {
2564 fac_ptr->nonstatic_oop_count += extra;
2565 // Add the additional entry to "fields" so that the klass
2566 // contains the "discoverd" field and the field will be initialized
2567 // in instances of the object.
2568 int fields_with_fix_length = (*fields_ptr)()->length() +
2569 instanceKlass::next_offset;
2570 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2571 fields_with_fix_length, CHECK);
2572 typeArrayHandle fields_with_fix(THREAD, ff);
2574 // Take everything from the original but the length.
2575 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2576 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2577 }
2579 // Add the fake field at the end.
2580 int i = (*fields_ptr)->length();
2581 // There is no name index for the fake "discovered" field nor
2582 // signature but a signature is needed so that the field will
2583 // be properly initialized. Use one found for
2584 // one of the other reference fields. Be sure the index for the
2585 // name is 0. In fieldDescriptor::initialize() the index of the
2586 // name is checked. That check is by passed for the last nonstatic
2587 // oop field in a java.lang.ref.Reference which is assumed to be
2588 // this artificial "discovered" field. An assertion checks that
2589 // the name index is 0.
2590 assert(reference_index != 0, "Missing signature for reference");
2592 int j;
2593 for (j = 0; j < instanceKlass::next_offset; j++) {
2594 fields_with_fix->ushort_at_put(i + j,
2595 (*fields_ptr)->ushort_at(reference_index +j));
2596 }
2597 // Clear the public access flag and set the private access flag.
2598 short flags;
2599 flags =
2600 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2601 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2602 flags = flags & (~JVM_ACC_PUBLIC);
2603 flags = flags | JVM_ACC_PRIVATE;
2604 AccessFlags access_flags;
2605 access_flags.set_flags(flags);
2606 assert(!access_flags.is_public(), "Failed to clear public flag");
2607 assert(access_flags.is_private(), "Failed to set private flag");
2608 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2609 flags);
2611 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2612 == reference_name_index, "The fake reference name is incorrect");
2613 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2614 == reference_sig_index, "The fake reference signature is incorrect");
2615 // The type of the field is stored in the low_offset entry during
2616 // parsing.
2617 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2618 NONSTATIC_OOP, "The fake reference type is incorrect");
2620 // "fields" is allocated in the permanent generation. Disgard
2621 // it and let it be collected.
2622 (*fields_ptr) = fields_with_fix;
2623 }
2624 return;
2625 }
2628 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2629 FieldAllocationCount *fac_ptr, TRAPS) {
2630 // Add fake fields for java.lang.Class instances
2631 //
2632 // This is not particularly nice. We should consider adding a
2633 // private transient object field at the Java level to
2634 // java.lang.Class. Alternatively we could add a subclass of
2635 // instanceKlass which provides an accessor and size computer for
2636 // this field, but that appears to be more code than this hack.
2637 //
2638 // NOTE that we wedge these in at the beginning rather than the
2639 // end of the object because the Class layout changed between JDK
2640 // 1.3 and JDK 1.4 with the new reflection implementation; some
2641 // nonstatic oop fields were added at the Java level. The offsets
2642 // of these fake fields can't change between these two JDK
2643 // versions because when the offsets are computed at bootstrap
2644 // time we don't know yet which version of the JDK we're running in.
2646 // The values below are fake but will force two non-static oop fields and
2647 // a corresponding non-static oop map block to be allocated.
2648 const int extra = java_lang_Class::number_of_fake_oop_fields;
2649 fac_ptr->nonstatic_oop_count += extra;
2650 }
2653 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2654 // Cause the extra fake fields in java.lang.Class to show up before
2655 // the Java fields for layout compatibility between 1.3 and 1.4
2656 // Incrementing next_nonstatic_oop_offset here advances the
2657 // location where the real java fields are placed.
2658 const int extra = java_lang_Class::number_of_fake_oop_fields;
2659 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2660 }
2663 // Force MethodHandle.vmentry to be an unmanaged pointer.
2664 // There is no way for a classfile to express this, so we must help it.
2665 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2666 typeArrayHandle* fields_ptr,
2667 FieldAllocationCount *fac_ptr,
2668 TRAPS) {
2669 // Add fake fields for java.dyn.MethodHandle instances
2670 //
2671 // This is not particularly nice, but since there is no way to express
2672 // a native wordSize field in Java, we must do it at this level.
2674 if (!EnableMethodHandles) return;
2676 int word_sig_index = 0;
2677 const int cp_size = cp->length();
2678 for (int index = 1; index < cp_size; index++) {
2679 if (cp->tag_at(index).is_utf8() &&
2680 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2681 word_sig_index = index;
2682 break;
2683 }
2684 }
2686 if (word_sig_index == 0)
2687 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2688 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2690 bool found_vmentry = false;
2692 const int n = (*fields_ptr)()->length();
2693 for (int i = 0; i < n; i += instanceKlass::next_offset) {
2694 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2695 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2696 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2697 symbolOop f_name = cp->symbol_at(name_index);
2698 symbolOop f_sig = cp->symbol_at(sig_index);
2699 if (f_sig == vmSymbols::byte_signature() &&
2700 f_name == vmSymbols::vmentry_name() &&
2701 (acc_flags & JVM_ACC_STATIC) == 0) {
2702 // Adjust the field type from byte to an unmanaged pointer.
2703 assert(fac_ptr->nonstatic_byte_count > 0, "");
2704 fac_ptr->nonstatic_byte_count -= 1;
2706 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2707 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2708 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2709 else fac_ptr->nonstatic_word_count += 1;
2711 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset);
2712 assert(atype == NONSTATIC_BYTE, "");
2713 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2714 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2716 found_vmentry = true;
2717 break;
2718 }
2719 }
2721 if (!found_vmentry)
2722 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2723 "missing vmentry byte field in java.dyn.MethodHandle");
2725 }
2728 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2729 Handle class_loader,
2730 Handle protection_domain,
2731 KlassHandle host_klass,
2732 GrowableArray<Handle>* cp_patches,
2733 symbolHandle& parsed_name,
2734 bool verify,
2735 TRAPS) {
2736 // So that JVMTI can cache class file in the state before retransformable agents
2737 // have modified it
2738 unsigned char *cached_class_file_bytes = NULL;
2739 jint cached_class_file_length;
2741 ClassFileStream* cfs = stream();
2742 // Timing
2743 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2744 JavaThread* jt = (JavaThread*) THREAD;
2746 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2747 ClassLoader::perf_class_parse_selftime(),
2748 NULL,
2749 jt->get_thread_stat()->perf_recursion_counts_addr(),
2750 jt->get_thread_stat()->perf_timers_addr(),
2751 PerfClassTraceTime::PARSE_CLASS);
2753 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2755 if (JvmtiExport::should_post_class_file_load_hook()) {
2756 unsigned char* ptr = cfs->buffer();
2757 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2759 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2760 &ptr, &end_ptr,
2761 &cached_class_file_bytes,
2762 &cached_class_file_length);
2764 if (ptr != cfs->buffer()) {
2765 // JVMTI agent has modified class file data.
2766 // Set new class file stream using JVMTI agent modified
2767 // class file data.
2768 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2769 set_stream(cfs);
2770 }
2771 }
2773 _host_klass = host_klass;
2774 _cp_patches = cp_patches;
2776 instanceKlassHandle nullHandle;
2778 // Figure out whether we can skip format checking (matching classic VM behavior)
2779 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2781 // Set the verify flag in stream
2782 cfs->set_verify(_need_verify);
2784 // Save the class file name for easier error message printing.
2785 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2787 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2788 // Magic value
2789 u4 magic = cfs->get_u4_fast();
2790 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2791 "Incompatible magic value %u in class file %s",
2792 magic, CHECK_(nullHandle));
2794 // Version numbers
2795 u2 minor_version = cfs->get_u2_fast();
2796 u2 major_version = cfs->get_u2_fast();
2798 // Check version numbers - we check this even with verifier off
2799 if (!is_supported_version(major_version, minor_version)) {
2800 if (name.is_null()) {
2801 Exceptions::fthrow(
2802 THREAD_AND_LOCATION,
2803 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2804 "Unsupported major.minor version %u.%u",
2805 major_version,
2806 minor_version);
2807 } else {
2808 ResourceMark rm(THREAD);
2809 Exceptions::fthrow(
2810 THREAD_AND_LOCATION,
2811 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2812 "%s : Unsupported major.minor version %u.%u",
2813 name->as_C_string(),
2814 major_version,
2815 minor_version);
2816 }
2817 return nullHandle;
2818 }
2820 _major_version = major_version;
2821 _minor_version = minor_version;
2824 // Check if verification needs to be relaxed for this class file
2825 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2826 _relax_verify = Verifier::relax_verify_for(class_loader());
2828 // Constant pool
2829 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2830 int cp_size = cp->length();
2832 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2834 // Access flags
2835 AccessFlags access_flags;
2836 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2838 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2839 // Set abstract bit for old class files for backward compatibility
2840 flags |= JVM_ACC_ABSTRACT;
2841 }
2842 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2843 access_flags.set_flags(flags);
2845 // This class and superclass
2846 instanceKlassHandle super_klass;
2847 u2 this_class_index = cfs->get_u2_fast();
2848 check_property(
2849 valid_cp_range(this_class_index, cp_size) &&
2850 cp->tag_at(this_class_index).is_unresolved_klass(),
2851 "Invalid this class index %u in constant pool in class file %s",
2852 this_class_index, CHECK_(nullHandle));
2854 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2855 assert(class_name.not_null(), "class_name can't be null");
2857 // It's important to set parsed_name *before* resolving the super class.
2858 // (it's used for cleanup by the caller if parsing fails)
2859 parsed_name = class_name;
2861 // Update _class_name which could be null previously to be class_name
2862 _class_name = class_name;
2864 // Don't need to check whether this class name is legal or not.
2865 // It has been checked when constant pool is parsed.
2866 // However, make sure it is not an array type.
2867 if (_need_verify) {
2868 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2869 "Bad class name in class file %s",
2870 CHECK_(nullHandle));
2871 }
2873 klassOop preserve_this_klass; // for storing result across HandleMark
2875 // release all handles when parsing is done
2876 { HandleMark hm(THREAD);
2878 // Checks if name in class file matches requested name
2879 if (name.not_null() && class_name() != name()) {
2880 ResourceMark rm(THREAD);
2881 Exceptions::fthrow(
2882 THREAD_AND_LOCATION,
2883 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2884 "%s (wrong name: %s)",
2885 name->as_C_string(),
2886 class_name->as_C_string()
2887 );
2888 return nullHandle;
2889 }
2891 if (TraceClassLoadingPreorder) {
2892 tty->print("[Loading %s", name()->as_klass_external_name());
2893 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2894 tty->print_cr("]");
2895 }
2897 u2 super_class_index = cfs->get_u2_fast();
2898 if (super_class_index == 0) {
2899 check_property(class_name() == vmSymbols::java_lang_Object(),
2900 "Invalid superclass index %u in class file %s",
2901 super_class_index,
2902 CHECK_(nullHandle));
2903 } else {
2904 check_property(valid_cp_range(super_class_index, cp_size) &&
2905 is_klass_reference(cp, super_class_index),
2906 "Invalid superclass index %u in class file %s",
2907 super_class_index,
2908 CHECK_(nullHandle));
2909 // The class name should be legal because it is checked when parsing constant pool.
2910 // However, make sure it is not an array type.
2911 bool is_array = false;
2912 if (cp->tag_at(super_class_index).is_klass()) {
2913 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2914 if (_need_verify)
2915 is_array = super_klass->oop_is_array();
2916 } else if (_need_verify) {
2917 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2918 }
2919 if (_need_verify) {
2920 guarantee_property(!is_array,
2921 "Bad superclass name in class file %s", CHECK_(nullHandle));
2922 }
2923 }
2925 // Interfaces
2926 u2 itfs_len = cfs->get_u2_fast();
2927 objArrayHandle local_interfaces;
2928 if (itfs_len == 0) {
2929 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2930 } else {
2931 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2932 }
2934 // Fields (offsets are filled in later)
2935 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2936 objArrayHandle fields_annotations;
2937 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2938 // Methods
2939 bool has_final_method = false;
2940 AccessFlags promoted_flags;
2941 promoted_flags.set_flags(0);
2942 // These need to be oop pointers because they are allocated lazily
2943 // inside parse_methods inside a nested HandleMark
2944 objArrayOop methods_annotations_oop = NULL;
2945 objArrayOop methods_parameter_annotations_oop = NULL;
2946 objArrayOop methods_default_annotations_oop = NULL;
2947 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2948 &promoted_flags,
2949 &has_final_method,
2950 &methods_annotations_oop,
2951 &methods_parameter_annotations_oop,
2952 &methods_default_annotations_oop,
2953 CHECK_(nullHandle));
2955 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2956 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2957 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2959 // We check super class after class file is parsed and format is checked
2960 if (super_class_index > 0 && super_klass.is_null()) {
2961 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2962 if (access_flags.is_interface()) {
2963 // Before attempting to resolve the superclass, check for class format
2964 // errors not checked yet.
2965 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2966 "Interfaces must have java.lang.Object as superclass in class file %s",
2967 CHECK_(nullHandle));
2968 }
2969 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2970 sk,
2971 class_loader,
2972 protection_domain,
2973 true,
2974 CHECK_(nullHandle));
2976 KlassHandle kh (THREAD, k);
2977 super_klass = instanceKlassHandle(THREAD, kh());
2978 if (LinkWellKnownClasses) // my super class is well known to me
2979 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2980 }
2981 if (super_klass.not_null()) {
2982 if (super_klass->is_interface()) {
2983 ResourceMark rm(THREAD);
2984 Exceptions::fthrow(
2985 THREAD_AND_LOCATION,
2986 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2987 "class %s has interface %s as super class",
2988 class_name->as_klass_external_name(),
2989 super_klass->external_name()
2990 );
2991 return nullHandle;
2992 }
2993 // Make sure super class is not final
2994 if (super_klass->is_final()) {
2995 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2996 }
2997 }
2999 // Compute the transitive list of all unique interfaces implemented by this class
3000 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3002 // sort methods
3003 typeArrayHandle method_ordering = sort_methods(methods,
3004 methods_annotations,
3005 methods_parameter_annotations,
3006 methods_default_annotations,
3007 CHECK_(nullHandle));
3009 // promote flags from parse_methods() to the klass' flags
3010 access_flags.add_promoted_flags(promoted_flags.as_int());
3012 // Size of Java vtable (in words)
3013 int vtable_size = 0;
3014 int itable_size = 0;
3015 int num_miranda_methods = 0;
3017 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3018 num_miranda_methods,
3019 super_klass(),
3020 methods(),
3021 access_flags,
3022 class_loader,
3023 class_name,
3024 local_interfaces(),
3025 CHECK_(nullHandle));
3027 // Size of Java itable (in words)
3028 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3030 // Field size and offset computation
3031 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3032 #ifndef PRODUCT
3033 int orig_nonstatic_field_size = 0;
3034 #endif
3035 int static_field_size = 0;
3036 int next_static_oop_offset;
3037 int next_static_double_offset;
3038 int next_static_word_offset;
3039 int next_static_short_offset;
3040 int next_static_byte_offset;
3041 int next_static_type_offset;
3042 int next_nonstatic_oop_offset;
3043 int next_nonstatic_double_offset;
3044 int next_nonstatic_word_offset;
3045 int next_nonstatic_short_offset;
3046 int next_nonstatic_byte_offset;
3047 int next_nonstatic_type_offset;
3048 int first_nonstatic_oop_offset;
3049 int first_nonstatic_field_offset;
3050 int next_nonstatic_field_offset;
3052 // Calculate the starting byte offsets
3053 next_static_oop_offset = (instanceKlass::header_size() +
3054 align_object_offset(vtable_size) +
3055 align_object_offset(itable_size)) * wordSize;
3056 next_static_double_offset = next_static_oop_offset +
3057 (fac.static_oop_count * heapOopSize);
3058 if ( fac.static_double_count &&
3059 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3060 Universe::field_type_should_be_aligned(T_LONG)) ) {
3061 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3062 }
3064 next_static_word_offset = next_static_double_offset +
3065 (fac.static_double_count * BytesPerLong);
3066 next_static_short_offset = next_static_word_offset +
3067 (fac.static_word_count * BytesPerInt);
3068 next_static_byte_offset = next_static_short_offset +
3069 (fac.static_short_count * BytesPerShort);
3070 next_static_type_offset = align_size_up((next_static_byte_offset +
3071 fac.static_byte_count ), wordSize );
3072 static_field_size = (next_static_type_offset -
3073 next_static_oop_offset) / wordSize;
3074 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3075 nonstatic_field_size * heapOopSize;
3076 next_nonstatic_field_offset = first_nonstatic_field_offset;
3078 // Add fake fields for java.lang.Class instances (also see below)
3079 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3080 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3081 }
3083 // adjust the vmentry field declaration in java.dyn.MethodHandle
3084 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3085 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
3086 }
3088 // Add a fake "discovered" field if it is not present
3089 // for compatibility with earlier jdk's.
3090 if (class_name() == vmSymbols::java_lang_ref_Reference()
3091 && class_loader.is_null()) {
3092 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3093 }
3094 // end of "discovered" field compactibility fix
3096 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3097 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3098 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3099 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3100 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3102 bool super_has_nonstatic_fields =
3103 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3104 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3105 ((nonstatic_double_count + nonstatic_word_count +
3106 nonstatic_short_count + nonstatic_byte_count +
3107 nonstatic_oop_count) != 0);
3110 // Prepare list of oops for oop map generation.
3111 int* nonstatic_oop_offsets;
3112 unsigned int* nonstatic_oop_counts;
3113 unsigned int nonstatic_oop_map_count = 0;
3115 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3116 THREAD, int, nonstatic_oop_count + 1);
3117 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3118 THREAD, unsigned int, nonstatic_oop_count + 1);
3120 // Add fake fields for java.lang.Class instances (also see above).
3121 // FieldsAllocationStyle and CompactFields values will be reset to default.
3122 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3123 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3124 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3125 const uint fake_oop_count = (next_nonstatic_field_offset -
3126 first_nonstatic_field_offset) / heapOopSize;
3127 nonstatic_oop_counts[0] = fake_oop_count;
3128 nonstatic_oop_map_count = 1;
3129 nonstatic_oop_count -= fake_oop_count;
3130 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3131 } else {
3132 first_nonstatic_oop_offset = 0; // will be set for first oop field
3133 }
3135 #ifndef PRODUCT
3136 if( PrintCompactFieldsSavings ) {
3137 next_nonstatic_double_offset = next_nonstatic_field_offset +
3138 (nonstatic_oop_count * heapOopSize);
3139 if ( nonstatic_double_count > 0 ) {
3140 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3141 }
3142 next_nonstatic_word_offset = next_nonstatic_double_offset +
3143 (nonstatic_double_count * BytesPerLong);
3144 next_nonstatic_short_offset = next_nonstatic_word_offset +
3145 (nonstatic_word_count * BytesPerInt);
3146 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3147 (nonstatic_short_count * BytesPerShort);
3148 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3149 nonstatic_byte_count ), heapOopSize );
3150 orig_nonstatic_field_size = nonstatic_field_size +
3151 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3152 }
3153 #endif
3154 bool compact_fields = CompactFields;
3155 int allocation_style = FieldsAllocationStyle;
3156 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3157 assert(false, "0 <= FieldsAllocationStyle <= 2");
3158 allocation_style = 1; // Optimistic
3159 }
3161 // The next classes have predefined hard-coded fields offsets
3162 // (see in JavaClasses::compute_hard_coded_offsets()).
3163 // Use default fields allocation order for them.
3164 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3165 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
3166 class_name() == vmSymbols::java_lang_Class() ||
3167 class_name() == vmSymbols::java_lang_ClassLoader() ||
3168 class_name() == vmSymbols::java_lang_ref_Reference() ||
3169 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
3170 class_name() == vmSymbols::java_lang_StackTraceElement() ||
3171 class_name() == vmSymbols::java_lang_String() ||
3172 class_name() == vmSymbols::java_lang_Throwable() ||
3173 class_name() == vmSymbols::java_lang_Boolean() ||
3174 class_name() == vmSymbols::java_lang_Character() ||
3175 class_name() == vmSymbols::java_lang_Float() ||
3176 class_name() == vmSymbols::java_lang_Double() ||
3177 class_name() == vmSymbols::java_lang_Byte() ||
3178 class_name() == vmSymbols::java_lang_Short() ||
3179 class_name() == vmSymbols::java_lang_Integer() ||
3180 class_name() == vmSymbols::java_lang_Long())) {
3181 allocation_style = 0; // Allocate oops first
3182 compact_fields = false; // Don't compact fields
3183 }
3185 if( allocation_style == 0 ) {
3186 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3187 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3188 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3189 (nonstatic_oop_count * heapOopSize);
3190 } else if( allocation_style == 1 ) {
3191 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3192 next_nonstatic_double_offset = next_nonstatic_field_offset;
3193 } else if( allocation_style == 2 ) {
3194 // Fields allocation: oops fields in super and sub classes are together.
3195 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3196 super_klass->nonstatic_oop_map_size() > 0 ) {
3197 int map_size = super_klass->nonstatic_oop_map_size();
3198 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3199 OopMapBlock* last_map = first_map + map_size - 1;
3200 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3201 if (next_offset == next_nonstatic_field_offset) {
3202 allocation_style = 0; // allocate oops first
3203 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3204 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3205 (nonstatic_oop_count * heapOopSize);
3206 }
3207 }
3208 if( allocation_style == 2 ) {
3209 allocation_style = 1; // allocate oops last
3210 next_nonstatic_double_offset = next_nonstatic_field_offset;
3211 }
3212 } else {
3213 ShouldNotReachHere();
3214 }
3216 int nonstatic_oop_space_count = 0;
3217 int nonstatic_word_space_count = 0;
3218 int nonstatic_short_space_count = 0;
3219 int nonstatic_byte_space_count = 0;
3220 int nonstatic_oop_space_offset;
3221 int nonstatic_word_space_offset;
3222 int nonstatic_short_space_offset;
3223 int nonstatic_byte_space_offset;
3225 if( nonstatic_double_count > 0 ) {
3226 int offset = next_nonstatic_double_offset;
3227 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3228 if( compact_fields && offset != next_nonstatic_double_offset ) {
3229 // Allocate available fields into the gap before double field.
3230 int length = next_nonstatic_double_offset - offset;
3231 assert(length == BytesPerInt, "");
3232 nonstatic_word_space_offset = offset;
3233 if( nonstatic_word_count > 0 ) {
3234 nonstatic_word_count -= 1;
3235 nonstatic_word_space_count = 1; // Only one will fit
3236 length -= BytesPerInt;
3237 offset += BytesPerInt;
3238 }
3239 nonstatic_short_space_offset = offset;
3240 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3241 nonstatic_short_count -= 1;
3242 nonstatic_short_space_count += 1;
3243 length -= BytesPerShort;
3244 offset += BytesPerShort;
3245 }
3246 nonstatic_byte_space_offset = offset;
3247 while( length > 0 && nonstatic_byte_count > 0 ) {
3248 nonstatic_byte_count -= 1;
3249 nonstatic_byte_space_count += 1;
3250 length -= 1;
3251 }
3252 // Allocate oop field in the gap if there are no other fields for that.
3253 nonstatic_oop_space_offset = offset;
3254 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3255 allocation_style != 0 ) { // when oop fields not first
3256 nonstatic_oop_count -= 1;
3257 nonstatic_oop_space_count = 1; // Only one will fit
3258 length -= heapOopSize;
3259 offset += heapOopSize;
3260 }
3261 }
3262 }
3264 next_nonstatic_word_offset = next_nonstatic_double_offset +
3265 (nonstatic_double_count * BytesPerLong);
3266 next_nonstatic_short_offset = next_nonstatic_word_offset +
3267 (nonstatic_word_count * BytesPerInt);
3268 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3269 (nonstatic_short_count * BytesPerShort);
3271 int notaligned_offset;
3272 if( allocation_style == 0 ) {
3273 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3274 } else { // allocation_style == 1
3275 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3276 if( nonstatic_oop_count > 0 ) {
3277 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3278 }
3279 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3280 }
3281 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3282 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3283 - first_nonstatic_field_offset)/heapOopSize);
3285 // Iterate over fields again and compute correct offsets.
3286 // The field allocation type was temporarily stored in the offset slot.
3287 // oop fields are located before non-oop fields (static and non-static).
3288 int len = fields->length();
3289 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3290 int real_offset;
3291 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3292 switch (atype) {
3293 case STATIC_OOP:
3294 real_offset = next_static_oop_offset;
3295 next_static_oop_offset += heapOopSize;
3296 break;
3297 case STATIC_BYTE:
3298 real_offset = next_static_byte_offset;
3299 next_static_byte_offset += 1;
3300 break;
3301 case STATIC_SHORT:
3302 real_offset = next_static_short_offset;
3303 next_static_short_offset += BytesPerShort;
3304 break;
3305 case STATIC_WORD:
3306 real_offset = next_static_word_offset;
3307 next_static_word_offset += BytesPerInt;
3308 break;
3309 case STATIC_ALIGNED_DOUBLE:
3310 case STATIC_DOUBLE:
3311 real_offset = next_static_double_offset;
3312 next_static_double_offset += BytesPerLong;
3313 break;
3314 case NONSTATIC_OOP:
3315 if( nonstatic_oop_space_count > 0 ) {
3316 real_offset = nonstatic_oop_space_offset;
3317 nonstatic_oop_space_offset += heapOopSize;
3318 nonstatic_oop_space_count -= 1;
3319 } else {
3320 real_offset = next_nonstatic_oop_offset;
3321 next_nonstatic_oop_offset += heapOopSize;
3322 }
3323 // Update oop maps
3324 if( nonstatic_oop_map_count > 0 &&
3325 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3326 real_offset -
3327 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3328 heapOopSize ) {
3329 // Extend current oop map
3330 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3331 } else {
3332 // Create new oop map
3333 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3334 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3335 nonstatic_oop_map_count += 1;
3336 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3337 first_nonstatic_oop_offset = real_offset;
3338 }
3339 }
3340 break;
3341 case NONSTATIC_BYTE:
3342 if( nonstatic_byte_space_count > 0 ) {
3343 real_offset = nonstatic_byte_space_offset;
3344 nonstatic_byte_space_offset += 1;
3345 nonstatic_byte_space_count -= 1;
3346 } else {
3347 real_offset = next_nonstatic_byte_offset;
3348 next_nonstatic_byte_offset += 1;
3349 }
3350 break;
3351 case NONSTATIC_SHORT:
3352 if( nonstatic_short_space_count > 0 ) {
3353 real_offset = nonstatic_short_space_offset;
3354 nonstatic_short_space_offset += BytesPerShort;
3355 nonstatic_short_space_count -= 1;
3356 } else {
3357 real_offset = next_nonstatic_short_offset;
3358 next_nonstatic_short_offset += BytesPerShort;
3359 }
3360 break;
3361 case NONSTATIC_WORD:
3362 if( nonstatic_word_space_count > 0 ) {
3363 real_offset = nonstatic_word_space_offset;
3364 nonstatic_word_space_offset += BytesPerInt;
3365 nonstatic_word_space_count -= 1;
3366 } else {
3367 real_offset = next_nonstatic_word_offset;
3368 next_nonstatic_word_offset += BytesPerInt;
3369 }
3370 break;
3371 case NONSTATIC_ALIGNED_DOUBLE:
3372 case NONSTATIC_DOUBLE:
3373 real_offset = next_nonstatic_double_offset;
3374 next_nonstatic_double_offset += BytesPerLong;
3375 break;
3376 default:
3377 ShouldNotReachHere();
3378 }
3379 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3380 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3381 }
3383 // Size of instances
3384 int instance_size;
3386 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3387 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3389 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3391 // Number of non-static oop map blocks allocated at end of klass.
3392 const unsigned int total_oop_map_count =
3393 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3394 first_nonstatic_oop_offset);
3396 // Compute reference type
3397 ReferenceType rt;
3398 if (super_klass() == NULL) {
3399 rt = REF_NONE;
3400 } else {
3401 rt = super_klass->reference_type();
3402 }
3404 // We can now create the basic klassOop for this klass
3405 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3406 static_field_size,
3407 total_oop_map_count,
3408 rt, CHECK_(nullHandle));
3409 instanceKlassHandle this_klass (THREAD, ik);
3411 assert(this_klass->static_field_size() == static_field_size, "sanity");
3412 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3413 "sanity");
3415 // Fill in information already parsed
3416 this_klass->set_access_flags(access_flags);
3417 this_klass->set_should_verify_class(verify);
3418 jint lh = Klass::instance_layout_helper(instance_size, false);
3419 this_klass->set_layout_helper(lh);
3420 assert(this_klass->oop_is_instance(), "layout is correct");
3421 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3422 // Not yet: supers are done below to support the new subtype-checking fields
3423 //this_klass->set_super(super_klass());
3424 this_klass->set_class_loader(class_loader());
3425 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3426 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3427 this_klass->set_static_oop_field_size(fac.static_oop_count);
3428 cp->set_pool_holder(this_klass());
3429 this_klass->set_constants(cp());
3430 this_klass->set_local_interfaces(local_interfaces());
3431 this_klass->set_fields(fields());
3432 this_klass->set_methods(methods());
3433 if (has_final_method) {
3434 this_klass->set_has_final_method();
3435 }
3436 this_klass->set_method_ordering(method_ordering());
3437 // The instanceKlass::_methods_jmethod_ids cache and the
3438 // instanceKlass::_methods_cached_itable_indices cache are
3439 // both managed on the assumption that the initial cache
3440 // size is equal to the number of methods in the class. If
3441 // that changes, then instanceKlass::idnum_can_increment()
3442 // has to be changed accordingly.
3443 this_klass->set_initial_method_idnum(methods->length());
3444 this_klass->set_name(cp->klass_name_at(this_class_index));
3445 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3446 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3447 this_klass->set_protection_domain(protection_domain());
3448 this_klass->set_fields_annotations(fields_annotations());
3449 this_klass->set_methods_annotations(methods_annotations());
3450 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3451 this_klass->set_methods_default_annotations(methods_default_annotations());
3453 this_klass->set_minor_version(minor_version);
3454 this_klass->set_major_version(major_version);
3456 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3457 // (We used to do this lazily, but now we query it in Rewriter,
3458 // which is eagerly done for every method, so we might as well do it now,
3459 // when everything is fresh in memory.)
3460 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3461 for (int j = 0; j < methods->length(); j++) {
3462 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3463 }
3464 }
3466 if (cached_class_file_bytes != NULL) {
3467 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3468 this_klass->set_cached_class_file(cached_class_file_bytes,
3469 cached_class_file_length);
3470 }
3472 // Miranda methods
3473 if ((num_miranda_methods > 0) ||
3474 // if this class introduced new miranda methods or
3475 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3476 // super class exists and this class inherited miranda methods
3477 ) {
3478 this_klass->set_has_miranda_methods(); // then set a flag
3479 }
3481 // Additional attributes
3482 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3484 // Make sure this is the end of class file stream
3485 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3487 // Initialize static fields
3488 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3490 // VerifyOops believes that once this has been set, the object is completely loaded.
3491 // Compute transitive closure of interfaces this class implements
3492 this_klass->set_transitive_interfaces(transitive_interfaces());
3494 // Fill in information needed to compute superclasses.
3495 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3497 // Initialize itable offset tables
3498 klassItable::setup_itable_offset_table(this_klass);
3500 // Do final class setup
3501 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3503 set_precomputed_flags(this_klass);
3505 // reinitialize modifiers, using the InnerClasses attribute
3506 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3507 this_klass->set_modifier_flags(computed_modifiers);
3509 // check if this class can access its super class
3510 check_super_class_access(this_klass, CHECK_(nullHandle));
3512 // check if this class can access its superinterfaces
3513 check_super_interface_access(this_klass, CHECK_(nullHandle));
3515 // check if this class overrides any final method
3516 check_final_method_override(this_klass, CHECK_(nullHandle));
3518 // check that if this class is an interface then it doesn't have static methods
3519 if (this_klass->is_interface()) {
3520 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3521 }
3523 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3524 false /* not shared class */);
3526 if (TraceClassLoading) {
3527 // print in a single call to reduce interleaving of output
3528 if (cfs->source() != NULL) {
3529 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3530 cfs->source());
3531 } else if (class_loader.is_null()) {
3532 if (THREAD->is_Java_thread()) {
3533 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3534 tty->print("[Loaded %s by instance of %s]\n",
3535 this_klass->external_name(),
3536 instanceKlass::cast(caller)->external_name());
3537 } else {
3538 tty->print("[Loaded %s]\n", this_klass->external_name());
3539 }
3540 } else {
3541 ResourceMark rm;
3542 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3543 instanceKlass::cast(class_loader->klass())->external_name());
3544 }
3545 }
3547 if (TraceClassResolution) {
3548 // print out the superclass.
3549 const char * from = Klass::cast(this_klass())->external_name();
3550 if (this_klass->java_super() != NULL) {
3551 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3552 }
3553 // print out each of the interface classes referred to by this class.
3554 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3555 if (!local_interfaces.is_null()) {
3556 int length = local_interfaces->length();
3557 for (int i = 0; i < length; i++) {
3558 klassOop k = klassOop(local_interfaces->obj_at(i));
3559 instanceKlass* to_class = instanceKlass::cast(k);
3560 const char * to = to_class->external_name();
3561 tty->print("RESOLVE %s %s (interface)\n", from, to);
3562 }
3563 }
3564 }
3566 #ifndef PRODUCT
3567 if( PrintCompactFieldsSavings ) {
3568 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3569 tty->print("[Saved %d of %d bytes in %s]\n",
3570 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3571 orig_nonstatic_field_size*heapOopSize,
3572 this_klass->external_name());
3573 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3574 tty->print("[Wasted %d over %d bytes in %s]\n",
3575 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3576 orig_nonstatic_field_size*heapOopSize,
3577 this_klass->external_name());
3578 }
3579 }
3580 #endif
3582 // preserve result across HandleMark
3583 preserve_this_klass = this_klass();
3584 }
3586 // Create new handle outside HandleMark
3587 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3588 debug_only(this_klass->as_klassOop()->verify();)
3590 return this_klass;
3591 }
3594 unsigned int
3595 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3596 unsigned int nonstatic_oop_map_count,
3597 int first_nonstatic_oop_offset) {
3598 unsigned int map_count =
3599 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3600 if (nonstatic_oop_map_count > 0) {
3601 // We have oops to add to map
3602 if (map_count == 0) {
3603 map_count = nonstatic_oop_map_count;
3604 } else {
3605 // Check whether we should add a new map block or whether the last one can
3606 // be extended
3607 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3608 OopMapBlock* const last_map = first_map + map_count - 1;
3610 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3611 if (next_offset == first_nonstatic_oop_offset) {
3612 // There is no gap bettwen superklass's last oop field and first
3613 // local oop field, merge maps.
3614 nonstatic_oop_map_count -= 1;
3615 } else {
3616 // Superklass didn't end with a oop field, add extra maps
3617 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3618 }
3619 map_count += nonstatic_oop_map_count;
3620 }
3621 }
3622 return map_count;
3623 }
3626 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3627 unsigned int nonstatic_oop_map_count,
3628 int* nonstatic_oop_offsets,
3629 unsigned int* nonstatic_oop_counts) {
3630 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3631 const instanceKlass* const super = k->superklass();
3632 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3633 if (super_count > 0) {
3634 // Copy maps from superklass
3635 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3636 for (unsigned int i = 0; i < super_count; ++i) {
3637 *this_oop_map++ = *super_oop_map++;
3638 }
3639 }
3641 if (nonstatic_oop_map_count > 0) {
3642 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3643 // The counts differ because there is no gap between superklass's last oop
3644 // field and the first local oop field. Extend the last oop map copied
3645 // from the superklass instead of creating new one.
3646 nonstatic_oop_map_count--;
3647 nonstatic_oop_offsets++;
3648 this_oop_map--;
3649 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3650 this_oop_map++;
3651 }
3653 // Add new map blocks, fill them
3654 while (nonstatic_oop_map_count-- > 0) {
3655 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3656 this_oop_map->set_count(*nonstatic_oop_counts++);
3657 this_oop_map++;
3658 }
3659 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3660 this_oop_map, "sanity");
3661 }
3662 }
3665 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3666 klassOop super = k->super();
3668 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3669 // in which case we don't have to register objects as finalizable
3670 if (!_has_empty_finalizer) {
3671 if (_has_finalizer ||
3672 (super != NULL && super->klass_part()->has_finalizer())) {
3673 k->set_has_finalizer();
3674 }
3675 }
3677 #ifdef ASSERT
3678 bool f = false;
3679 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3680 vmSymbols::void_method_signature());
3681 if (m != NULL && !m->is_empty_method()) {
3682 f = true;
3683 }
3684 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3685 #endif
3687 // Check if this klass supports the java.lang.Cloneable interface
3688 if (SystemDictionary::Cloneable_klass_loaded()) {
3689 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3690 k->set_is_cloneable();
3691 }
3692 }
3694 // Check if this klass has a vanilla default constructor
3695 if (super == NULL) {
3696 // java.lang.Object has empty default constructor
3697 k->set_has_vanilla_constructor();
3698 } else {
3699 if (Klass::cast(super)->has_vanilla_constructor() &&
3700 _has_vanilla_constructor) {
3701 k->set_has_vanilla_constructor();
3702 }
3703 #ifdef ASSERT
3704 bool v = false;
3705 if (Klass::cast(super)->has_vanilla_constructor()) {
3706 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3707 ), vmSymbols::void_method_signature());
3708 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3709 v = true;
3710 }
3711 }
3712 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3713 #endif
3714 }
3716 // If it cannot be fast-path allocated, set a bit in the layout helper.
3717 // See documentation of instanceKlass::can_be_fastpath_allocated().
3718 assert(k->size_helper() > 0, "layout_helper is initialized");
3719 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3720 || k->is_abstract() || k->is_interface()
3721 || (k->name() == vmSymbols::java_lang_Class()
3722 && k->class_loader() == NULL)
3723 || k->size_helper() >= FastAllocateSizeLimit) {
3724 // Forbid fast-path allocation.
3725 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3726 k->set_layout_helper(lh);
3727 }
3728 }
3731 // utility method for appending and array with check for duplicates
3733 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3734 // iterate over new interfaces
3735 for (int i = 0; i < ifs->length(); i++) {
3736 oop e = ifs->obj_at(i);
3737 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3738 // check for duplicates
3739 bool duplicate = false;
3740 for (int j = 0; j < index; j++) {
3741 if (result->obj_at(j) == e) {
3742 duplicate = true;
3743 break;
3744 }
3745 }
3746 // add new interface
3747 if (!duplicate) {
3748 result->obj_at_put(index++, e);
3749 }
3750 }
3751 }
3753 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3754 // Compute maximum size for transitive interfaces
3755 int max_transitive_size = 0;
3756 int super_size = 0;
3757 // Add superclass transitive interfaces size
3758 if (super.not_null()) {
3759 super_size = super->transitive_interfaces()->length();
3760 max_transitive_size += super_size;
3761 }
3762 // Add local interfaces' super interfaces
3763 int local_size = local_ifs->length();
3764 for (int i = 0; i < local_size; i++) {
3765 klassOop l = klassOop(local_ifs->obj_at(i));
3766 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3767 }
3768 // Finally add local interfaces
3769 max_transitive_size += local_size;
3770 // Construct array
3771 objArrayHandle result;
3772 if (max_transitive_size == 0) {
3773 // no interfaces, use canonicalized array
3774 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3775 } else if (max_transitive_size == super_size) {
3776 // no new local interfaces added, share superklass' transitive interface array
3777 result = objArrayHandle(THREAD, super->transitive_interfaces());
3778 } else if (max_transitive_size == local_size) {
3779 // only local interfaces added, share local interface array
3780 result = local_ifs;
3781 } else {
3782 objArrayHandle nullHandle;
3783 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3784 result = objArrayHandle(THREAD, new_objarray);
3785 int index = 0;
3786 // Copy down from superclass
3787 if (super.not_null()) {
3788 append_interfaces(result, index, super->transitive_interfaces());
3789 }
3790 // Copy down from local interfaces' superinterfaces
3791 for (int i = 0; i < local_ifs->length(); i++) {
3792 klassOop l = klassOop(local_ifs->obj_at(i));
3793 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3794 }
3795 // Finally add local interfaces
3796 append_interfaces(result, index, local_ifs());
3798 // Check if duplicates were removed
3799 if (index != max_transitive_size) {
3800 assert(index < max_transitive_size, "just checking");
3801 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3802 for (int i = 0; i < index; i++) {
3803 oop e = result->obj_at(i);
3804 assert(e != NULL, "just checking");
3805 new_result->obj_at_put(i, e);
3806 }
3807 result = objArrayHandle(THREAD, new_result);
3808 }
3809 }
3810 return result;
3811 }
3814 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3815 klassOop super = this_klass->super();
3816 if ((super != NULL) &&
3817 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3818 ResourceMark rm(THREAD);
3819 Exceptions::fthrow(
3820 THREAD_AND_LOCATION,
3821 vmSymbolHandles::java_lang_IllegalAccessError(),
3822 "class %s cannot access its superclass %s",
3823 this_klass->external_name(),
3824 instanceKlass::cast(super)->external_name()
3825 );
3826 return;
3827 }
3828 }
3831 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3832 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3833 int lng = local_interfaces->length();
3834 for (int i = lng - 1; i >= 0; i--) {
3835 klassOop k = klassOop(local_interfaces->obj_at(i));
3836 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3837 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3838 ResourceMark rm(THREAD);
3839 Exceptions::fthrow(
3840 THREAD_AND_LOCATION,
3841 vmSymbolHandles::java_lang_IllegalAccessError(),
3842 "class %s cannot access its superinterface %s",
3843 this_klass->external_name(),
3844 instanceKlass::cast(k)->external_name()
3845 );
3846 return;
3847 }
3848 }
3849 }
3852 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3853 objArrayHandle methods (THREAD, this_klass->methods());
3854 int num_methods = methods->length();
3856 // go thru each method and check if it overrides a final method
3857 for (int index = 0; index < num_methods; index++) {
3858 methodOop m = (methodOop)methods->obj_at(index);
3860 // skip private, static and <init> methods
3861 if ((!m->is_private()) &&
3862 (!m->is_static()) &&
3863 (m->name() != vmSymbols::object_initializer_name())) {
3865 symbolOop name = m->name();
3866 symbolOop signature = m->signature();
3867 klassOop k = this_klass->super();
3868 methodOop super_m = NULL;
3869 while (k != NULL) {
3870 // skip supers that don't have final methods.
3871 if (k->klass_part()->has_final_method()) {
3872 // lookup a matching method in the super class hierarchy
3873 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3874 if (super_m == NULL) {
3875 break; // didn't find any match; get out
3876 }
3878 if (super_m->is_final() &&
3879 // matching method in super is final
3880 (Reflection::verify_field_access(this_klass->as_klassOop(),
3881 super_m->method_holder(),
3882 super_m->method_holder(),
3883 super_m->access_flags(), false))
3884 // this class can access super final method and therefore override
3885 ) {
3886 ResourceMark rm(THREAD);
3887 Exceptions::fthrow(
3888 THREAD_AND_LOCATION,
3889 vmSymbolHandles::java_lang_VerifyError(),
3890 "class %s overrides final method %s.%s",
3891 this_klass->external_name(),
3892 name->as_C_string(),
3893 signature->as_C_string()
3894 );
3895 return;
3896 }
3898 // continue to look from super_m's holder's super.
3899 k = instanceKlass::cast(super_m->method_holder())->super();
3900 continue;
3901 }
3903 k = k->klass_part()->super();
3904 }
3905 }
3906 }
3907 }
3910 // assumes that this_klass is an interface
3911 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3912 assert(this_klass->is_interface(), "not an interface");
3913 objArrayHandle methods (THREAD, this_klass->methods());
3914 int num_methods = methods->length();
3916 for (int index = 0; index < num_methods; index++) {
3917 methodOop m = (methodOop)methods->obj_at(index);
3918 // if m is static and not the init method, throw a verify error
3919 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3920 ResourceMark rm(THREAD);
3921 Exceptions::fthrow(
3922 THREAD_AND_LOCATION,
3923 vmSymbolHandles::java_lang_VerifyError(),
3924 "Illegal static method %s in interface %s",
3925 m->name()->as_C_string(),
3926 this_klass->external_name()
3927 );
3928 return;
3929 }
3930 }
3931 }
3933 // utility methods for format checking
3935 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3936 if (!_need_verify) { return; }
3938 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3939 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3940 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3941 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3942 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3943 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3944 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3946 if ((is_abstract && is_final) ||
3947 (is_interface && !is_abstract) ||
3948 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3949 (!is_interface && major_gte_15 && is_annotation)) {
3950 ResourceMark rm(THREAD);
3951 Exceptions::fthrow(
3952 THREAD_AND_LOCATION,
3953 vmSymbolHandles::java_lang_ClassFormatError(),
3954 "Illegal class modifiers in class %s: 0x%X",
3955 _class_name->as_C_string(), flags
3956 );
3957 return;
3958 }
3959 }
3961 bool ClassFileParser::has_illegal_visibility(jint flags) {
3962 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3963 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3964 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3966 return ((is_public && is_protected) ||
3967 (is_public && is_private) ||
3968 (is_protected && is_private));
3969 }
3971 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3972 u2 max_version =
3973 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3974 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3975 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3976 (major <= max_version) &&
3977 ((major != max_version) ||
3978 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3979 }
3981 void ClassFileParser::verify_legal_field_modifiers(
3982 jint flags, bool is_interface, TRAPS) {
3983 if (!_need_verify) { return; }
3985 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3986 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3987 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3988 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3989 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3990 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3991 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3992 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3993 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3995 bool is_illegal = false;
3997 if (is_interface) {
3998 if (!is_public || !is_static || !is_final || is_private ||
3999 is_protected || is_volatile || is_transient ||
4000 (major_gte_15 && is_enum)) {
4001 is_illegal = true;
4002 }
4003 } else { // not interface
4004 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4005 is_illegal = true;
4006 }
4007 }
4009 if (is_illegal) {
4010 ResourceMark rm(THREAD);
4011 Exceptions::fthrow(
4012 THREAD_AND_LOCATION,
4013 vmSymbolHandles::java_lang_ClassFormatError(),
4014 "Illegal field modifiers in class %s: 0x%X",
4015 _class_name->as_C_string(), flags);
4016 return;
4017 }
4018 }
4020 void ClassFileParser::verify_legal_method_modifiers(
4021 jint flags, bool is_interface, symbolHandle name, TRAPS) {
4022 if (!_need_verify) { return; }
4024 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4025 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4026 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4027 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4028 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4029 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4030 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4031 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4032 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4033 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4034 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4036 bool is_illegal = false;
4038 if (is_interface) {
4039 if (!is_abstract || !is_public || is_static || is_final ||
4040 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4041 is_illegal = true;
4042 }
4043 } else { // not interface
4044 if (is_initializer) {
4045 if (is_static || is_final || is_synchronized || is_native ||
4046 is_abstract || (major_gte_15 && is_bridge)) {
4047 is_illegal = true;
4048 }
4049 } else { // not initializer
4050 if (is_abstract) {
4051 if ((is_final || is_native || is_private || is_static ||
4052 (major_gte_15 && (is_synchronized || is_strict)))) {
4053 is_illegal = true;
4054 }
4055 }
4056 if (has_illegal_visibility(flags)) {
4057 is_illegal = true;
4058 }
4059 }
4060 }
4062 if (is_illegal) {
4063 ResourceMark rm(THREAD);
4064 Exceptions::fthrow(
4065 THREAD_AND_LOCATION,
4066 vmSymbolHandles::java_lang_ClassFormatError(),
4067 "Method %s in class %s has illegal modifiers: 0x%X",
4068 name->as_C_string(), _class_name->as_C_string(), flags);
4069 return;
4070 }
4071 }
4073 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4074 assert(_need_verify, "only called when _need_verify is true");
4075 int i = 0;
4076 int count = length >> 2;
4077 for (int k=0; k<count; k++) {
4078 unsigned char b0 = buffer[i];
4079 unsigned char b1 = buffer[i+1];
4080 unsigned char b2 = buffer[i+2];
4081 unsigned char b3 = buffer[i+3];
4082 // For an unsigned char v,
4083 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4084 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4085 unsigned char res = b0 | b0 - 1 |
4086 b1 | b1 - 1 |
4087 b2 | b2 - 1 |
4088 b3 | b3 - 1;
4089 if (res >= 128) break;
4090 i += 4;
4091 }
4092 for(; i < length; i++) {
4093 unsigned short c;
4094 // no embedded zeros
4095 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4096 if(buffer[i] < 128) {
4097 continue;
4098 }
4099 if ((i + 5) < length) { // see if it's legal supplementary character
4100 if (UTF8::is_supplementary_character(&buffer[i])) {
4101 c = UTF8::get_supplementary_character(&buffer[i]);
4102 i += 5;
4103 continue;
4104 }
4105 }
4106 switch (buffer[i] >> 4) {
4107 default: break;
4108 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4109 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4110 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4111 c = (buffer[i] & 0x1F) << 6;
4112 i++;
4113 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4114 c += buffer[i] & 0x3F;
4115 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4116 // for classes with major > 47, c must a null or a character in its shortest form
4117 break;
4118 }
4119 }
4120 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4121 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4122 c = (buffer[i] & 0xF) << 12;
4123 i += 2;
4124 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4125 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4126 if (_major_version <= 47 || c >= 0x800) {
4127 // for classes with major > 47, c must be in its shortest form
4128 break;
4129 }
4130 }
4131 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4132 } // end of switch
4133 } // end of for
4134 }
4136 // Checks if name is a legal class name.
4137 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
4138 if (!_need_verify || _relax_verify) { return; }
4140 char buf[fixed_buffer_size];
4141 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4142 unsigned int length = name->utf8_length();
4143 bool legal = false;
4145 if (length > 0) {
4146 char* p;
4147 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4148 p = skip_over_field_signature(bytes, false, length, CHECK);
4149 legal = (p != NULL) && ((p - bytes) == (int)length);
4150 } else if (_major_version < JAVA_1_5_VERSION) {
4151 if (bytes[0] != '<') {
4152 p = skip_over_field_name(bytes, true, length);
4153 legal = (p != NULL) && ((p - bytes) == (int)length);
4154 }
4155 } else {
4156 // 4900761: relax the constraints based on JSR202 spec
4157 // Class names may be drawn from the entire Unicode character set.
4158 // Identifiers between '/' must be unqualified names.
4159 // The utf8 string has been verified when parsing cpool entries.
4160 legal = verify_unqualified_name(bytes, length, LegalClass);
4161 }
4162 }
4163 if (!legal) {
4164 ResourceMark rm(THREAD);
4165 Exceptions::fthrow(
4166 THREAD_AND_LOCATION,
4167 vmSymbolHandles::java_lang_ClassFormatError(),
4168 "Illegal class name \"%s\" in class file %s", bytes,
4169 _class_name->as_C_string()
4170 );
4171 return;
4172 }
4173 }
4175 // Checks if name is a legal field name.
4176 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
4177 if (!_need_verify || _relax_verify) { return; }
4179 char buf[fixed_buffer_size];
4180 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4181 unsigned int length = name->utf8_length();
4182 bool legal = false;
4184 if (length > 0) {
4185 if (_major_version < JAVA_1_5_VERSION) {
4186 if (bytes[0] != '<') {
4187 char* p = skip_over_field_name(bytes, false, length);
4188 legal = (p != NULL) && ((p - bytes) == (int)length);
4189 }
4190 } else {
4191 // 4881221: relax the constraints based on JSR202 spec
4192 legal = verify_unqualified_name(bytes, length, LegalField);
4193 }
4194 }
4196 if (!legal) {
4197 ResourceMark rm(THREAD);
4198 Exceptions::fthrow(
4199 THREAD_AND_LOCATION,
4200 vmSymbolHandles::java_lang_ClassFormatError(),
4201 "Illegal field name \"%s\" in class %s", bytes,
4202 _class_name->as_C_string()
4203 );
4204 return;
4205 }
4206 }
4208 // Checks if name is a legal method name.
4209 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
4210 if (!_need_verify || _relax_verify) { return; }
4212 assert(!name.is_null(), "method name is null");
4213 char buf[fixed_buffer_size];
4214 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4215 unsigned int length = name->utf8_length();
4216 bool legal = false;
4218 if (length > 0) {
4219 if (bytes[0] == '<') {
4220 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4221 legal = true;
4222 }
4223 } else if (_major_version < JAVA_1_5_VERSION) {
4224 char* p;
4225 p = skip_over_field_name(bytes, false, length);
4226 legal = (p != NULL) && ((p - bytes) == (int)length);
4227 } else {
4228 // 4881221: relax the constraints based on JSR202 spec
4229 legal = verify_unqualified_name(bytes, length, LegalMethod);
4230 }
4231 }
4233 if (!legal) {
4234 ResourceMark rm(THREAD);
4235 Exceptions::fthrow(
4236 THREAD_AND_LOCATION,
4237 vmSymbolHandles::java_lang_ClassFormatError(),
4238 "Illegal method name \"%s\" in class %s", bytes,
4239 _class_name->as_C_string()
4240 );
4241 return;
4242 }
4243 }
4246 // Checks if signature is a legal field signature.
4247 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4248 if (!_need_verify) { return; }
4250 char buf[fixed_buffer_size];
4251 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4252 unsigned int length = signature->utf8_length();
4253 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4255 if (p == NULL || (p - bytes) != (int)length) {
4256 throwIllegalSignature("Field", name, signature, CHECK);
4257 }
4258 }
4260 // Checks if signature is a legal method signature.
4261 // Returns number of parameters
4262 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4263 if (!_need_verify) {
4264 // make sure caller's args_size will be less than 0 even for non-static
4265 // method so it will be recomputed in compute_size_of_parameters().
4266 return -2;
4267 }
4269 unsigned int args_size = 0;
4270 char buf[fixed_buffer_size];
4271 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4272 unsigned int length = signature->utf8_length();
4273 char* nextp;
4275 // The first character must be a '('
4276 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4277 length--;
4278 // Skip over legal field signatures
4279 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4280 while ((length > 0) && (nextp != NULL)) {
4281 args_size++;
4282 if (p[0] == 'J' || p[0] == 'D') {
4283 args_size++;
4284 }
4285 length -= nextp - p;
4286 p = nextp;
4287 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4288 }
4289 // The first non-signature thing better be a ')'
4290 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4291 length--;
4292 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4293 // All internal methods must return void
4294 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4295 return args_size;
4296 }
4297 } else {
4298 // Now we better just have a return value
4299 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4300 if (nextp && ((int)length == (nextp - p))) {
4301 return args_size;
4302 }
4303 }
4304 }
4305 }
4306 // Report error
4307 throwIllegalSignature("Method", name, signature, CHECK_0);
4308 return 0;
4309 }
4312 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4313 // Method names also may not contain the characters '<' or '>', unless <init>
4314 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4315 // method. Because these names have been checked as special cases before
4316 // calling this method in verify_legal_method_name.
4317 bool ClassFileParser::verify_unqualified_name(
4318 char* name, unsigned int length, int type) {
4319 jchar ch;
4321 for (char* p = name; p != name + length; ) {
4322 ch = *p;
4323 if (ch < 128) {
4324 p++;
4325 if (ch == '.' || ch == ';' || ch == '[' ) {
4326 return false; // do not permit '.', ';', or '['
4327 }
4328 if (type != LegalClass && ch == '/') {
4329 return false; // do not permit '/' unless it's class name
4330 }
4331 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4332 return false; // do not permit '<' or '>' in method names
4333 }
4334 } else {
4335 char* tmp_p = UTF8::next(p, &ch);
4336 p = tmp_p;
4337 }
4338 }
4339 return true;
4340 }
4343 // Take pointer to a string. Skip over the longest part of the string that could
4344 // be taken as a fieldname. Allow '/' if slash_ok is true.
4345 // Return a pointer to just past the fieldname.
4346 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4347 // being true, we saw consecutive slashes (meaning we were looking for a
4348 // qualified path but found something that was badly-formed).
4349 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4350 char* p;
4351 jchar ch;
4352 jboolean last_is_slash = false;
4353 jboolean not_first_ch = false;
4355 for (p = name; p != name + length; not_first_ch = true) {
4356 char* old_p = p;
4357 ch = *p;
4358 if (ch < 128) {
4359 p++;
4360 // quick check for ascii
4361 if ((ch >= 'a' && ch <= 'z') ||
4362 (ch >= 'A' && ch <= 'Z') ||
4363 (ch == '_' || ch == '$') ||
4364 (not_first_ch && ch >= '0' && ch <= '9')) {
4365 last_is_slash = false;
4366 continue;
4367 }
4368 if (slash_ok && ch == '/') {
4369 if (last_is_slash) {
4370 return NULL; // Don't permit consecutive slashes
4371 }
4372 last_is_slash = true;
4373 continue;
4374 }
4375 } else {
4376 jint unicode_ch;
4377 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4378 p = tmp_p;
4379 last_is_slash = false;
4380 // Check if ch is Java identifier start or is Java identifier part
4381 // 4672820: call java.lang.Character methods directly without generating separate tables.
4382 EXCEPTION_MARK;
4383 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4385 // return value
4386 JavaValue result(T_BOOLEAN);
4387 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4388 JavaCallArguments args;
4389 args.push_int(unicode_ch);
4391 // public static boolean isJavaIdentifierStart(char ch);
4392 JavaCalls::call_static(&result,
4393 klass,
4394 vmSymbolHandles::isJavaIdentifierStart_name(),
4395 vmSymbolHandles::int_bool_signature(),
4396 &args,
4397 THREAD);
4399 if (HAS_PENDING_EXCEPTION) {
4400 CLEAR_PENDING_EXCEPTION;
4401 return 0;
4402 }
4403 if (result.get_jboolean()) {
4404 continue;
4405 }
4407 if (not_first_ch) {
4408 // public static boolean isJavaIdentifierPart(char ch);
4409 JavaCalls::call_static(&result,
4410 klass,
4411 vmSymbolHandles::isJavaIdentifierPart_name(),
4412 vmSymbolHandles::int_bool_signature(),
4413 &args,
4414 THREAD);
4416 if (HAS_PENDING_EXCEPTION) {
4417 CLEAR_PENDING_EXCEPTION;
4418 return 0;
4419 }
4421 if (result.get_jboolean()) {
4422 continue;
4423 }
4424 }
4425 }
4426 return (not_first_ch) ? old_p : NULL;
4427 }
4428 return (not_first_ch) ? p : NULL;
4429 }
4432 // Take pointer to a string. Skip over the longest part of the string that could
4433 // be taken as a field signature. Allow "void" if void_ok.
4434 // Return a pointer to just past the signature.
4435 // Return NULL if no legal signature is found.
4436 char* ClassFileParser::skip_over_field_signature(char* signature,
4437 bool void_ok,
4438 unsigned int length,
4439 TRAPS) {
4440 unsigned int array_dim = 0;
4441 while (length > 0) {
4442 switch (signature[0]) {
4443 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4444 case JVM_SIGNATURE_BOOLEAN:
4445 case JVM_SIGNATURE_BYTE:
4446 case JVM_SIGNATURE_CHAR:
4447 case JVM_SIGNATURE_SHORT:
4448 case JVM_SIGNATURE_INT:
4449 case JVM_SIGNATURE_FLOAT:
4450 case JVM_SIGNATURE_LONG:
4451 case JVM_SIGNATURE_DOUBLE:
4452 return signature + 1;
4453 case JVM_SIGNATURE_CLASS: {
4454 if (_major_version < JAVA_1_5_VERSION) {
4455 // Skip over the class name if one is there
4456 char* p = skip_over_field_name(signature + 1, true, --length);
4458 // The next character better be a semicolon
4459 if (p && (p - signature) > 1 && p[0] == ';') {
4460 return p + 1;
4461 }
4462 } else {
4463 // 4900761: For class version > 48, any unicode is allowed in class name.
4464 length--;
4465 signature++;
4466 while (length > 0 && signature[0] != ';') {
4467 if (signature[0] == '.') {
4468 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4469 }
4470 length--;
4471 signature++;
4472 }
4473 if (signature[0] == ';') { return signature + 1; }
4474 }
4476 return NULL;
4477 }
4478 case JVM_SIGNATURE_ARRAY:
4479 array_dim++;
4480 if (array_dim > 255) {
4481 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4482 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4483 }
4484 // The rest of what's there better be a legal signature
4485 signature++;
4486 length--;
4487 void_ok = false;
4488 break;
4490 default:
4491 return NULL;
4492 }
4493 }
4494 return NULL;
4495 }
