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 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_classFileParser.cpp.incl"
27
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.
32
33 // We add assert in debug mode when class format is not checked.
34
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
39
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
44
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
49
50 // Used for backward compatibility reasons:
51 // - to check NameAndType_info signatures more aggressively
52 #define JAVA_7_VERSION 51
53
54
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 u1* old_current = cfs0->current();
66 #endif
67
68 // Used for batching symbol allocations.
69 const char* names[SymbolTable::symbol_alloc_batch_size];
70 int lengths[SymbolTable::symbol_alloc_batch_size];
71 int indices[SymbolTable::symbol_alloc_batch_size];
72 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
73 int names_count = 0;
74
75 // parsing Index 0 is unused
76 for (int index = 1; index < length; index++) {
77 // Each of the following case guarantees one more byte in the stream
78 // for the following tag or the access_flags following constant pool,
79 // so we don't need bounds-check for reading tag.
80 u1 tag = cfs->get_u1_fast();
81 switch (tag) {
82 case JVM_CONSTANT_Class :
83 {
84 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
85 u2 name_index = cfs->get_u2_fast();
86 cp->klass_index_at_put(index, name_index);
87 }
88 break;
89 case JVM_CONSTANT_Fieldref :
90 {
91 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
92 u2 class_index = cfs->get_u2_fast();
93 u2 name_and_type_index = cfs->get_u2_fast();
94 cp->field_at_put(index, class_index, name_and_type_index);
95 }
96 break;
97 case JVM_CONSTANT_Methodref :
98 {
99 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
100 u2 class_index = cfs->get_u2_fast();
101 u2 name_and_type_index = cfs->get_u2_fast();
102 cp->method_at_put(index, class_index, name_and_type_index);
103 }
104 break;
105 case JVM_CONSTANT_InterfaceMethodref :
106 {
107 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
108 u2 class_index = cfs->get_u2_fast();
109 u2 name_and_type_index = cfs->get_u2_fast();
110 cp->interface_method_at_put(index, class_index, name_and_type_index);
111 }
112 break;
113 case JVM_CONSTANT_String :
114 {
115 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
116 u2 string_index = cfs->get_u2_fast();
117 cp->string_index_at_put(index, string_index);
118 }
119 break;
120 case JVM_CONSTANT_MethodHandle :
121 case JVM_CONSTANT_MethodType :
122 if (!EnableMethodHandles ||
123 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
124 classfile_parse_error(
125 (!EnableMethodHandles ?
126 "This JVM does not support constant tag %u in class file %s" :
127 "Class file version does not support constant tag %u in class file %s"),
128 tag, CHECK);
129 }
130 if (tag == JVM_CONSTANT_MethodHandle) {
131 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
132 u1 ref_kind = cfs->get_u1_fast();
133 u2 method_index = cfs->get_u2_fast();
134 cp->method_handle_index_at_put(index, ref_kind, method_index);
135 } else if (tag == JVM_CONSTANT_MethodType) {
136 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
137 u2 signature_index = cfs->get_u2_fast();
138 cp->method_type_index_at_put(index, signature_index);
139 } else {
140 ShouldNotReachHere();
141 }
142 break;
143 case JVM_CONSTANT_InvokeDynamic :
144 {
145 if (!EnableInvokeDynamic ||
146 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
147 classfile_parse_error(
148 (!EnableInvokeDynamic ?
149 "This JVM does not support constant tag %u in class file %s" :
150 "Class file version does not support constant tag %u in class file %s"),
151 tag, CHECK);
152 }
153 cfs->guarantee_more(5, CHECK); // bsm_index, name_and_type_index, tag/access_flags
154 u2 bootstrap_method_index = cfs->get_u2_fast();
155 u2 name_and_type_index = cfs->get_u2_fast();
156 cp->invoke_dynamic_at_put(index, bootstrap_method_index, name_and_type_index);
157 }
158 break;
159 case JVM_CONSTANT_Integer :
160 {
161 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
162 u4 bytes = cfs->get_u4_fast();
163 cp->int_at_put(index, (jint) bytes);
164 }
165 break;
166 case JVM_CONSTANT_Float :
167 {
168 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
169 u4 bytes = cfs->get_u4_fast();
170 cp->float_at_put(index, *(jfloat*)&bytes);
171 }
172 break;
173 case JVM_CONSTANT_Long :
174 // A mangled type might cause you to overrun allocated memory
175 guarantee_property(index+1 < length,
176 "Invalid constant pool entry %u in class file %s",
177 index, CHECK);
178 {
179 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
180 u8 bytes = cfs->get_u8_fast();
181 cp->long_at_put(index, bytes);
182 }
183 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
184 break;
185 case JVM_CONSTANT_Double :
186 // A mangled type might cause you to overrun allocated memory
187 guarantee_property(index+1 < length,
188 "Invalid constant pool entry %u in class file %s",
189 index, CHECK);
190 {
191 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
192 u8 bytes = cfs->get_u8_fast();
193 cp->double_at_put(index, *(jdouble*)&bytes);
194 }
195 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
196 break;
197 case JVM_CONSTANT_NameAndType :
198 {
199 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
200 u2 name_index = cfs->get_u2_fast();
201 u2 signature_index = cfs->get_u2_fast();
202 cp->name_and_type_at_put(index, name_index, signature_index);
203 }
204 break;
205 case JVM_CONSTANT_Utf8 :
206 {
207 cfs->guarantee_more(2, CHECK); // utf8_length
208 u2 utf8_length = cfs->get_u2_fast();
209 u1* utf8_buffer = cfs->get_u1_buffer();
210 assert(utf8_buffer != NULL, "null utf8 buffer");
211 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
212 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
213 cfs->skip_u1_fast(utf8_length);
214
215 // Before storing the symbol, make sure it's legal
216 if (_need_verify) {
217 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
218 }
219
220 if (AnonymousClasses && has_cp_patch_at(index)) {
221 Handle patch = clear_cp_patch_at(index);
222 guarantee_property(java_lang_String::is_instance(patch()),
223 "Illegal utf8 patch at %d in class file %s",
224 index, CHECK);
225 char* str = java_lang_String::as_utf8_string(patch());
226 // (could use java_lang_String::as_symbol instead, but might as well batch them)
227 utf8_buffer = (u1*) str;
228 utf8_length = (int) strlen(str);
229 }
230
231 unsigned int hash;
232 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
233 if (result == NULL) {
234 names[names_count] = (char*)utf8_buffer;
235 lengths[names_count] = utf8_length;
236 indices[names_count] = index;
237 hashValues[names_count++] = hash;
238 if (names_count == SymbolTable::symbol_alloc_batch_size) {
239 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
240 names_count = 0;
241 }
242 } else {
243 cp->symbol_at_put(index, result);
244 }
245 }
246 break;
247 default:
248 classfile_parse_error(
249 "Unknown constant tag %u in class file %s", tag, CHECK);
250 break;
251 }
252 }
253
254 // Allocate the remaining symbols
255 if (names_count > 0) {
256 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
257 }
258
259 // Copy _current pointer of local copy back to stream().
260 #ifdef ASSERT
261 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
262 #endif
263 cfs0->set_current(cfs1.current());
264 }
265
266 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
267
268 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
269 ClassFileStream* cfs = stream();
270 constantPoolHandle nullHandle;
271
272 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
273 u2 length = cfs->get_u2_fast();
274 guarantee_property(
275 length >= 1, "Illegal constant pool size %u in class file %s",
276 length, CHECK_(nullHandle));
277 constantPoolOop constant_pool =
278 oopFactory::new_constantPool(length,
279 methodOopDesc::IsSafeConc,
280 CHECK_(nullHandle));
281 constantPoolHandle cp (THREAD, constant_pool);
282
283 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
284
285 // parsing constant pool entries
286 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
287
288 int index = 1; // declared outside of loops for portability
289
290 // first verification pass - validate cross references and fixup class and string constants
291 for (index = 1; index < length; index++) { // Index 0 is unused
292 switch (cp->tag_at(index).value()) {
293 case JVM_CONSTANT_Class :
294 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
295 break;
296 case JVM_CONSTANT_Fieldref :
297 // fall through
298 case JVM_CONSTANT_Methodref :
299 // fall through
300 case JVM_CONSTANT_InterfaceMethodref : {
301 if (!_need_verify) break;
302 int klass_ref_index = cp->klass_ref_index_at(index);
303 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
304 check_property(valid_cp_range(klass_ref_index, length) &&
305 is_klass_reference(cp, klass_ref_index),
306 "Invalid constant pool index %u in class file %s",
307 klass_ref_index,
308 CHECK_(nullHandle));
309 check_property(valid_cp_range(name_and_type_ref_index, length) &&
310 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
311 "Invalid constant pool index %u in class file %s",
312 name_and_type_ref_index,
313 CHECK_(nullHandle));
314 break;
315 }
316 case JVM_CONSTANT_String :
317 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
318 break;
319 case JVM_CONSTANT_Integer :
320 break;
321 case JVM_CONSTANT_Float :
322 break;
323 case JVM_CONSTANT_Long :
324 case JVM_CONSTANT_Double :
325 index++;
326 check_property(
327 (index < length && cp->tag_at(index).is_invalid()),
328 "Improper constant pool long/double index %u in class file %s",
329 index, CHECK_(nullHandle));
330 break;
331 case JVM_CONSTANT_NameAndType : {
332 if (!_need_verify) break;
333 int name_ref_index = cp->name_ref_index_at(index);
334 int signature_ref_index = cp->signature_ref_index_at(index);
335 check_property(
336 valid_cp_range(name_ref_index, length) &&
337 cp->tag_at(name_ref_index).is_utf8(),
338 "Invalid constant pool index %u in class file %s",
339 name_ref_index, CHECK_(nullHandle));
340 check_property(
341 valid_cp_range(signature_ref_index, length) &&
342 cp->tag_at(signature_ref_index).is_utf8(),
343 "Invalid constant pool index %u in class file %s",
344 signature_ref_index, CHECK_(nullHandle));
345 break;
346 }
347 case JVM_CONSTANT_Utf8 :
348 break;
349 case JVM_CONSTANT_UnresolvedClass : // fall-through
350 case JVM_CONSTANT_UnresolvedClassInError:
351 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
352 break;
353 case JVM_CONSTANT_ClassIndex :
354 {
355 int class_index = cp->klass_index_at(index);
356 check_property(
357 valid_cp_range(class_index, length) &&
358 cp->tag_at(class_index).is_utf8(),
359 "Invalid constant pool index %u in class file %s",
360 class_index, CHECK_(nullHandle));
361 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
362 }
363 break;
364 case JVM_CONSTANT_UnresolvedString :
365 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
366 break;
367 case JVM_CONSTANT_StringIndex :
368 {
369 int string_index = cp->string_index_at(index);
370 check_property(
371 valid_cp_range(string_index, length) &&
372 cp->tag_at(string_index).is_utf8(),
373 "Invalid constant pool index %u in class file %s",
374 string_index, CHECK_(nullHandle));
375 symbolOop sym = cp->symbol_at(string_index);
376 cp->unresolved_string_at_put(index, sym);
377 }
378 break;
379 case JVM_CONSTANT_MethodHandle :
380 {
381 int ref_index = cp->method_handle_index_at(index);
382 check_property(
383 valid_cp_range(ref_index, length) &&
384 EnableMethodHandles,
385 "Invalid constant pool index %u in class file %s",
386 ref_index, CHECK_(nullHandle));
387 constantTag tag = cp->tag_at(ref_index);
388 int ref_kind = cp->method_handle_ref_kind_at(index);
389 switch (ref_kind) {
390 case JVM_REF_getField:
391 case JVM_REF_getStatic:
392 case JVM_REF_putField:
393 case JVM_REF_putStatic:
394 check_property(
395 tag.is_field(),
396 "Invalid constant pool index %u in class file %s (not a field)",
397 ref_index, CHECK_(nullHandle));
398 break;
399 case JVM_REF_invokeVirtual:
400 case JVM_REF_invokeStatic:
401 case JVM_REF_invokeSpecial:
402 case JVM_REF_newInvokeSpecial:
403 check_property(
404 tag.is_method(),
405 "Invalid constant pool index %u in class file %s (not a method)",
406 ref_index, CHECK_(nullHandle));
407 break;
408 case JVM_REF_invokeInterface:
409 check_property(
410 tag.is_interface_method(),
411 "Invalid constant pool index %u in class file %s (not an interface method)",
412 ref_index, CHECK_(nullHandle));
413 break;
414 default:
415 classfile_parse_error(
416 "Bad method handle kind at constant pool index %u in class file %s",
417 index, CHECK_(nullHandle));
418 }
419 // Keep the ref_index unchanged. It will be indirected at link-time.
420 }
421 break;
422 case JVM_CONSTANT_MethodType :
423 {
424 int ref_index = cp->method_type_index_at(index);
425 check_property(
426 valid_cp_range(ref_index, length) &&
427 cp->tag_at(ref_index).is_utf8() &&
428 EnableMethodHandles,
429 "Invalid constant pool index %u in class file %s",
430 ref_index, CHECK_(nullHandle));
431 }
432 break;
433 case JVM_CONSTANT_InvokeDynamic :
434 {
435 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
436 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
437 check_property((bootstrap_method_ref_index == 0 && AllowTransitionalJSR292)
438 ||
439 (valid_cp_range(bootstrap_method_ref_index, length) &&
440 cp->tag_at(bootstrap_method_ref_index).is_method_handle()),
441 "Invalid constant pool index %u in class file %s",
442 bootstrap_method_ref_index,
443 CHECK_(nullHandle));
444 check_property(valid_cp_range(name_and_type_ref_index, length) &&
445 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
446 "Invalid constant pool index %u in class file %s",
447 name_and_type_ref_index,
448 CHECK_(nullHandle));
449 break;
450 }
451 default:
452 fatal(err_msg("bad constant pool tag value %u",
453 cp->tag_at(index).value()));
454 ShouldNotReachHere();
455 break;
456 } // end of switch
457 } // end of for
458
459 if (_cp_patches != NULL) {
460 // need to treat this_class specially...
461 assert(AnonymousClasses, "");
462 int this_class_index;
463 {
464 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
465 u1* mark = cfs->current();
466 u2 flags = cfs->get_u2_fast();
467 this_class_index = cfs->get_u2_fast();
468 cfs->set_current(mark); // revert to mark
469 }
470
471 for (index = 1; index < length; index++) { // Index 0 is unused
472 if (has_cp_patch_at(index)) {
473 guarantee_property(index != this_class_index,
474 "Illegal constant pool patch to self at %d in class file %s",
475 index, CHECK_(nullHandle));
476 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
477 }
478 }
479 // Ensure that all the patches have been used.
480 for (index = 0; index < _cp_patches->length(); index++) {
481 guarantee_property(!has_cp_patch_at(index),
482 "Unused constant pool patch at %d in class file %s",
483 index, CHECK_(nullHandle));
484 }
485 }
486
487 if (!_need_verify) {
488 return cp;
489 }
490
491 // second verification pass - checks the strings are of the right format.
492 // but not yet to the other entries
493 for (index = 1; index < length; index++) {
494 jbyte tag = cp->tag_at(index).value();
495 switch (tag) {
496 case JVM_CONSTANT_UnresolvedClass: {
497 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
498 // check the name, even if _cp_patches will overwrite it
499 verify_legal_class_name(class_name, CHECK_(nullHandle));
500 break;
501 }
502 case JVM_CONSTANT_NameAndType: {
503 if (_need_verify && _major_version >= JAVA_7_VERSION) {
504 int sig_index = cp->signature_ref_index_at(index);
505 int name_index = cp->name_ref_index_at(index);
506 symbolHandle name(THREAD, cp->symbol_at(name_index));
507 symbolHandle sig(THREAD, cp->symbol_at(sig_index));
508 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
509 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
510 } else {
511 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
512 }
513 }
514 break;
515 }
516 case JVM_CONSTANT_Fieldref:
517 case JVM_CONSTANT_Methodref:
518 case JVM_CONSTANT_InterfaceMethodref: {
519 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
520 // already verified to be utf8
521 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
522 // already verified to be utf8
523 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
524 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
525 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
526 if (tag == JVM_CONSTANT_Fieldref) {
527 verify_legal_field_name(name, CHECK_(nullHandle));
528 if (_need_verify && _major_version >= JAVA_7_VERSION) {
529 // Signature is verified above, when iterating NameAndType_info.
530 // Need only to be sure it's the right type.
531 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
532 throwIllegalSignature(
533 "Field", name, signature, CHECK_(nullHandle));
534 }
535 } else {
536 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
537 }
538 } else {
539 verify_legal_method_name(name, CHECK_(nullHandle));
540 if (_need_verify && _major_version >= JAVA_7_VERSION) {
541 // Signature is verified above, when iterating NameAndType_info.
542 // Need only to be sure it's the right type.
543 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
544 throwIllegalSignature(
545 "Method", name, signature, CHECK_(nullHandle));
546 }
547 } else {
548 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
549 }
550 if (tag == JVM_CONSTANT_Methodref) {
551 // 4509014: If a class method name begins with '<', it must be "<init>".
552 assert(!name.is_null(), "method name in constant pool is null");
553 unsigned int name_len = name->utf8_length();
554 assert(name_len > 0, "bad method name"); // already verified as legal name
555 if (name->byte_at(0) == '<') {
556 if (name() != vmSymbols::object_initializer_name()) {
557 classfile_parse_error(
558 "Bad method name at constant pool index %u in class file %s",
559 name_ref_index, CHECK_(nullHandle));
560 }
561 }
562 }
563 }
564 break;
565 }
566 case JVM_CONSTANT_MethodHandle: {
567 int ref_index = cp->method_handle_index_at(index);
568 int ref_kind = cp->method_handle_ref_kind_at(index);
569 switch (ref_kind) {
570 case JVM_REF_invokeVirtual:
571 case JVM_REF_invokeStatic:
572 case JVM_REF_invokeSpecial:
573 case JVM_REF_newInvokeSpecial:
574 {
575 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
576 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
577 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
578 if (ref_kind == JVM_REF_newInvokeSpecial) {
579 if (name() != vmSymbols::object_initializer_name()) {
580 classfile_parse_error(
581 "Bad constructor name at constant pool index %u in class file %s",
582 name_ref_index, CHECK_(nullHandle));
583 }
584 } else {
585 if (name() == vmSymbols::object_initializer_name()) {
586 classfile_parse_error(
587 "Bad method name at constant pool index %u in class file %s",
588 name_ref_index, CHECK_(nullHandle));
589 }
590 }
591 }
592 break;
593 // Other ref_kinds are already fully checked in previous pass.
594 }
595 break;
596 }
597 case JVM_CONSTANT_MethodType: {
598 symbolHandle no_name = vmSymbolHandles::type_name(); // place holder
599 symbolHandle signature(THREAD, cp->method_type_signature_at(index));
600 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
601 break;
602 }
603 } // end of switch
604 } // end of for
605
606 return cp;
607 }
608
609
610 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
611 assert(AnonymousClasses, "");
612 BasicType patch_type = T_VOID;
613 switch (cp->tag_at(index).value()) {
614
615 case JVM_CONSTANT_UnresolvedClass :
616 // Patching a class means pre-resolving it.
617 // The name in the constant pool is ignored.
618 if (java_lang_Class::is_instance(patch())) {
619 guarantee_property(!java_lang_Class::is_primitive(patch()),
620 "Illegal class patch at %d in class file %s",
621 index, CHECK);
622 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
623 } else {
624 guarantee_property(java_lang_String::is_instance(patch()),
625 "Illegal class patch at %d in class file %s",
626 index, CHECK);
627 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
628 cp->unresolved_klass_at_put(index, name());
629 }
630 break;
631
632 case JVM_CONSTANT_UnresolvedString :
633 // Patching a string means pre-resolving it.
634 // The spelling in the constant pool is ignored.
635 // The constant reference may be any object whatever.
636 // If it is not a real interned string, the constant is referred
637 // to as a "pseudo-string", and must be presented to the CP
638 // explicitly, because it may require scavenging.
639 cp->pseudo_string_at_put(index, patch());
640 break;
641
642 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
643 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
644 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
645 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
646 patch_prim:
647 {
648 jvalue value;
649 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
650 guarantee_property(value_type == patch_type,
651 "Illegal primitive patch at %d in class file %s",
652 index, CHECK);
653 switch (value_type) {
654 case T_INT: cp->int_at_put(index, value.i); break;
655 case T_FLOAT: cp->float_at_put(index, value.f); break;
656 case T_LONG: cp->long_at_put(index, value.j); break;
657 case T_DOUBLE: cp->double_at_put(index, value.d); break;
658 default: assert(false, "");
659 }
660 }
661 break;
662
663 default:
664 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
665 guarantee_property(!has_cp_patch_at(index),
666 "Illegal unexpected patch at %d in class file %s",
667 index, CHECK);
668 return;
669 }
670
671 // On fall-through, mark the patch as used.
672 clear_cp_patch_at(index);
673 }
674
675
676
677 class NameSigHash: public ResourceObj {
678 public:
679 symbolOop _name; // name
680 symbolOop _sig; // signature
681 NameSigHash* _next; // Next entry in hash table
682 };
683
684
685 #define HASH_ROW_SIZE 256
686
687 unsigned int hash(symbolOop name, symbolOop sig) {
688 unsigned int raw_hash = 0;
689 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
690 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
691
692 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
693 }
694
695
696 void initialize_hashtable(NameSigHash** table) {
697 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
698 }
699
700 // Return false if the name/sig combination is found in table.
701 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
702 // The old format checker uses heap sort to find duplicates.
703 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
704 // of table since we don't expect symbolOop's to move.
705 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
706 assert(name != NULL, "name in constant pool is NULL");
707
708 // First lookup for duplicates
709 int index = hash(name, sig);
710 NameSigHash* entry = table[index];
711 while (entry != NULL) {
712 if (entry->_name == name && entry->_sig == sig) {
713 return false;
714 }
715 entry = entry->_next;
716 }
717
718 // No duplicate is found, allocate a new entry and fill it.
719 entry = new NameSigHash();
720 entry->_name = name;
721 entry->_sig = sig;
722
723 // Insert into hash table
724 entry->_next = table[index];
725 table[index] = entry;
726
727 return true;
728 }
729
730
731 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
732 int length,
733 Handle class_loader,
734 Handle protection_domain,
735 symbolHandle class_name,
736 TRAPS) {
737 ClassFileStream* cfs = stream();
738 assert(length > 0, "only called for length>0");
739 objArrayHandle nullHandle;
740 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
741 objArrayHandle interfaces (THREAD, interface_oop);
742
743 int index;
744 for (index = 0; index < length; index++) {
745 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
746 KlassHandle interf;
747 check_property(
748 valid_cp_range(interface_index, cp->length()) &&
749 is_klass_reference(cp, interface_index),
750 "Interface name has bad constant pool index %u in class file %s",
751 interface_index, CHECK_(nullHandle));
752 if (cp->tag_at(interface_index).is_klass()) {
753 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
754 } else {
755 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
756
757 // Don't need to check legal name because it's checked when parsing constant pool.
758 // But need to make sure it's not an array type.
759 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
760 "Bad interface name in class file %s", CHECK_(nullHandle));
761
762 // Call resolve_super so classcircularity is checked
763 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
764 unresolved_klass, class_loader, protection_domain,
765 false, CHECK_(nullHandle));
766 interf = KlassHandle(THREAD, k);
767
768 if (LinkWellKnownClasses) // my super type is well known to me
769 cp->klass_at_put(interface_index, interf()); // eagerly resolve
770 }
771
772 if (!Klass::cast(interf())->is_interface()) {
773 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
774 }
775 interfaces->obj_at_put(index, interf());
776 }
777
778 if (!_need_verify || length <= 1) {
779 return interfaces;
780 }
781
782 // Check if there's any duplicates in interfaces
783 ResourceMark rm(THREAD);
784 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
785 THREAD, NameSigHash*, HASH_ROW_SIZE);
786 initialize_hashtable(interface_names);
787 bool dup = false;
788 {
789 debug_only(No_Safepoint_Verifier nsv;)
790 for (index = 0; index < length; index++) {
791 klassOop k = (klassOop)interfaces->obj_at(index);
792 symbolOop name = instanceKlass::cast(k)->name();
793 // If no duplicates, add (name, NULL) in hashtable interface_names.
794 if (!put_after_lookup(name, NULL, interface_names)) {
795 dup = true;
796 break;
797 }
798 }
799 }
800 if (dup) {
801 classfile_parse_error("Duplicate interface name in class file %s",
802 CHECK_(nullHandle));
803 }
804
805 return interfaces;
806 }
807
808
809 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
810 // Make sure the constant pool entry is of a type appropriate to this field
811 guarantee_property(
812 (constantvalue_index > 0 &&
813 constantvalue_index < cp->length()),
814 "Bad initial value index %u in ConstantValue attribute in class file %s",
815 constantvalue_index, CHECK);
816 constantTag value_type = cp->tag_at(constantvalue_index);
817 switch ( cp->basic_type_for_signature_at(signature_index) ) {
818 case T_LONG:
819 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
820 break;
821 case T_FLOAT:
822 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
823 break;
824 case T_DOUBLE:
825 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
826 break;
827 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
828 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
829 break;
830 case T_OBJECT:
831 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
832 && (value_type.is_string() || value_type.is_unresolved_string())),
833 "Bad string initial value in class file %s", CHECK);
834 break;
835 default:
836 classfile_parse_error(
837 "Unable to set initial value %u in class file %s",
838 constantvalue_index, CHECK);
839 }
840 }
841
842
843 // Parse attributes for a field.
844 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
845 u2 attributes_count,
846 bool is_static, u2 signature_index,
847 u2* constantvalue_index_addr,
848 bool* is_synthetic_addr,
849 u2* generic_signature_index_addr,
850 typeArrayHandle* field_annotations,
851 TRAPS) {
852 ClassFileStream* cfs = stream();
853 assert(attributes_count > 0, "length should be greater than 0");
854 u2 constantvalue_index = 0;
855 u2 generic_signature_index = 0;
856 bool is_synthetic = false;
857 u1* runtime_visible_annotations = NULL;
858 int runtime_visible_annotations_length = 0;
859 u1* runtime_invisible_annotations = NULL;
860 int runtime_invisible_annotations_length = 0;
861 while (attributes_count--) {
862 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
863 u2 attribute_name_index = cfs->get_u2_fast();
864 u4 attribute_length = cfs->get_u4_fast();
865 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
866 cp->tag_at(attribute_name_index).is_utf8(),
867 "Invalid field attribute index %u in class file %s",
868 attribute_name_index,
869 CHECK);
870 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
871 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
872 // ignore if non-static
873 if (constantvalue_index != 0) {
874 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
875 }
876 check_property(
877 attribute_length == 2,
878 "Invalid ConstantValue field attribute length %u in class file %s",
879 attribute_length, CHECK);
880 constantvalue_index = cfs->get_u2(CHECK);
881 if (_need_verify) {
882 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
883 }
884 } else if (attribute_name == vmSymbols::tag_synthetic()) {
885 if (attribute_length != 0) {
886 classfile_parse_error(
887 "Invalid Synthetic field attribute length %u in class file %s",
888 attribute_length, CHECK);
889 }
890 is_synthetic = true;
891 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
892 if (attribute_length != 0) {
893 classfile_parse_error(
894 "Invalid Deprecated field attribute length %u in class file %s",
895 attribute_length, CHECK);
896 }
897 } else if (_major_version >= JAVA_1_5_VERSION) {
898 if (attribute_name == vmSymbols::tag_signature()) {
899 if (attribute_length != 2) {
900 classfile_parse_error(
901 "Wrong size %u for field's Signature attribute in class file %s",
902 attribute_length, CHECK);
903 }
904 generic_signature_index = cfs->get_u2(CHECK);
905 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
906 runtime_visible_annotations_length = attribute_length;
907 runtime_visible_annotations = cfs->get_u1_buffer();
908 assert(runtime_visible_annotations != NULL, "null visible annotations");
909 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
910 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
911 runtime_invisible_annotations_length = attribute_length;
912 runtime_invisible_annotations = cfs->get_u1_buffer();
913 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
914 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
915 } else {
916 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
917 }
918 } else {
919 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
920 }
921 }
922
923 *constantvalue_index_addr = constantvalue_index;
924 *is_synthetic_addr = is_synthetic;
925 *generic_signature_index_addr = generic_signature_index;
926 *field_annotations = assemble_annotations(runtime_visible_annotations,
927 runtime_visible_annotations_length,
928 runtime_invisible_annotations,
929 runtime_invisible_annotations_length,
930 CHECK);
931 return;
932 }
933
934
935 // Field allocation types. Used for computing field offsets.
936
937 enum FieldAllocationType {
938 STATIC_OOP, // Oops
939 STATIC_BYTE, // Boolean, Byte, char
940 STATIC_SHORT, // shorts
941 STATIC_WORD, // ints
942 STATIC_DOUBLE, // long or double
943 STATIC_ALIGNED_DOUBLE,// aligned long or double
944 NONSTATIC_OOP,
945 NONSTATIC_BYTE,
946 NONSTATIC_SHORT,
947 NONSTATIC_WORD,
948 NONSTATIC_DOUBLE,
949 NONSTATIC_ALIGNED_DOUBLE
950 };
951
952
953 struct FieldAllocationCount {
954 unsigned int static_oop_count;
955 unsigned int static_byte_count;
956 unsigned int static_short_count;
957 unsigned int static_word_count;
958 unsigned int static_double_count;
959 unsigned int nonstatic_oop_count;
960 unsigned int nonstatic_byte_count;
961 unsigned int nonstatic_short_count;
962 unsigned int nonstatic_word_count;
963 unsigned int nonstatic_double_count;
964 };
965
966 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
967 struct FieldAllocationCount *fac,
968 objArrayHandle* fields_annotations, TRAPS) {
969 ClassFileStream* cfs = stream();
970 typeArrayHandle nullHandle;
971 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
972 u2 length = cfs->get_u2_fast();
973 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
974 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
975 typeArrayHandle fields(THREAD, new_fields);
976
977 int index = 0;
978 typeArrayHandle field_annotations;
979 for (int n = 0; n < length; n++) {
980 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
981
982 AccessFlags access_flags;
983 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
984 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
985 access_flags.set_flags(flags);
986
987 u2 name_index = cfs->get_u2_fast();
988 int cp_size = cp->length();
989 check_property(
990 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
991 "Invalid constant pool index %u for field name in class file %s",
992 name_index, CHECK_(nullHandle));
993 symbolHandle name(THREAD, cp->symbol_at(name_index));
994 verify_legal_field_name(name, CHECK_(nullHandle));
995
996 u2 signature_index = cfs->get_u2_fast();
997 check_property(
998 valid_cp_range(signature_index, cp_size) &&
999 cp->tag_at(signature_index).is_utf8(),
1000 "Invalid constant pool index %u for field signature in class file %s",
1001 signature_index, CHECK_(nullHandle));
1002 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
1003 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1004
1005 u2 constantvalue_index = 0;
1006 bool is_synthetic = false;
1007 u2 generic_signature_index = 0;
1008 bool is_static = access_flags.is_static();
1009
1010 u2 attributes_count = cfs->get_u2_fast();
1011 if (attributes_count > 0) {
1012 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1013 &constantvalue_index, &is_synthetic,
1014 &generic_signature_index, &field_annotations,
1015 CHECK_(nullHandle));
1016 if (field_annotations.not_null()) {
1017 if (fields_annotations->is_null()) {
1018 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1019 *fields_annotations = objArrayHandle(THREAD, md);
1020 }
1021 (*fields_annotations)->obj_at_put(n, field_annotations());
1022 }
1023 if (is_synthetic) {
1024 access_flags.set_is_synthetic();
1025 }
1026 }
1027
1028 fields->short_at_put(index++, access_flags.as_short());
1029 fields->short_at_put(index++, name_index);
1030 fields->short_at_put(index++, signature_index);
1031 fields->short_at_put(index++, constantvalue_index);
1032
1033 // Remember how many oops we encountered and compute allocation type
1034 BasicType type = cp->basic_type_for_signature_at(signature_index);
1035 FieldAllocationType atype;
1036 if ( is_static ) {
1037 switch ( type ) {
1038 case T_BOOLEAN:
1039 case T_BYTE:
1040 fac->static_byte_count++;
1041 atype = STATIC_BYTE;
1042 break;
1043 case T_LONG:
1044 case T_DOUBLE:
1045 if (Universe::field_type_should_be_aligned(type)) {
1046 atype = STATIC_ALIGNED_DOUBLE;
1047 } else {
1048 atype = STATIC_DOUBLE;
1049 }
1050 fac->static_double_count++;
1051 break;
1052 case T_CHAR:
1053 case T_SHORT:
1054 fac->static_short_count++;
1055 atype = STATIC_SHORT;
1056 break;
1057 case T_FLOAT:
1058 case T_INT:
1059 fac->static_word_count++;
1060 atype = STATIC_WORD;
1061 break;
1062 case T_ARRAY:
1063 case T_OBJECT:
1064 fac->static_oop_count++;
1065 atype = STATIC_OOP;
1066 break;
1067 case T_ADDRESS:
1068 case T_VOID:
1069 default:
1070 assert(0, "bad field type");
1071 }
1072 } else {
1073 switch ( type ) {
1074 case T_BOOLEAN:
1075 case T_BYTE:
1076 fac->nonstatic_byte_count++;
1077 atype = NONSTATIC_BYTE;
1078 break;
1079 case T_LONG:
1080 case T_DOUBLE:
1081 if (Universe::field_type_should_be_aligned(type)) {
1082 atype = NONSTATIC_ALIGNED_DOUBLE;
1083 } else {
1084 atype = NONSTATIC_DOUBLE;
1085 }
1086 fac->nonstatic_double_count++;
1087 break;
1088 case T_CHAR:
1089 case T_SHORT:
1090 fac->nonstatic_short_count++;
1091 atype = NONSTATIC_SHORT;
1092 break;
1093 case T_FLOAT:
1094 case T_INT:
1095 fac->nonstatic_word_count++;
1096 atype = NONSTATIC_WORD;
1097 break;
1098 case T_ARRAY:
1099 case T_OBJECT:
1100 fac->nonstatic_oop_count++;
1101 atype = NONSTATIC_OOP;
1102 break;
1103 case T_ADDRESS:
1104 case T_VOID:
1105 default:
1106 assert(0, "bad field type");
1107 }
1108 }
1109
1110 // The correct offset is computed later (all oop fields will be located together)
1111 // We temporarily store the allocation type in the offset field
1112 fields->short_at_put(index++, atype);
1113 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1114 fields->short_at_put(index++, generic_signature_index);
1115 }
1116
1117 if (_need_verify && length > 1) {
1118 // Check duplicated fields
1119 ResourceMark rm(THREAD);
1120 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1121 THREAD, NameSigHash*, HASH_ROW_SIZE);
1122 initialize_hashtable(names_and_sigs);
1123 bool dup = false;
1124 {
1125 debug_only(No_Safepoint_Verifier nsv;)
1126 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1127 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1128 symbolOop name = cp->symbol_at(name_index);
1129 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1130 symbolOop sig = cp->symbol_at(sig_index);
1131 // If no duplicates, add name/signature in hashtable names_and_sigs.
1132 if (!put_after_lookup(name, sig, names_and_sigs)) {
1133 dup = true;
1134 break;
1135 }
1136 }
1137 }
1138 if (dup) {
1139 classfile_parse_error("Duplicate field name&signature in class file %s",
1140 CHECK_(nullHandle));
1141 }
1142 }
1143
1144 return fields;
1145 }
1146
1147
1148 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1149 while (length-- > 0) {
1150 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1151 }
1152 }
1153
1154
1155 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1156 u4 exception_table_length,
1157 constantPoolHandle cp,
1158 TRAPS) {
1159 ClassFileStream* cfs = stream();
1160 typeArrayHandle nullHandle;
1161
1162 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1163 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1164 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1165
1166 int index = 0;
1167 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1168 for (unsigned int i = 0; i < exception_table_length; i++) {
1169 u2 start_pc = cfs->get_u2_fast();
1170 u2 end_pc = cfs->get_u2_fast();
1171 u2 handler_pc = cfs->get_u2_fast();
1172 u2 catch_type_index = cfs->get_u2_fast();
1173 // Will check legal target after parsing code array in verifier.
1174 if (_need_verify) {
1175 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1176 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1177 guarantee_property(handler_pc < code_length,
1178 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1179 if (catch_type_index != 0) {
1180 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1181 is_klass_reference(cp, catch_type_index),
1182 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1183 }
1184 }
1185 exception_handlers->int_at_put(index++, start_pc);
1186 exception_handlers->int_at_put(index++, end_pc);
1187 exception_handlers->int_at_put(index++, handler_pc);
1188 exception_handlers->int_at_put(index++, catch_type_index);
1189 }
1190 return exception_handlers;
1191 }
1192
1193 void ClassFileParser::parse_linenumber_table(
1194 u4 code_attribute_length, u4 code_length,
1195 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1196 ClassFileStream* cfs = stream();
1197 unsigned int num_entries = cfs->get_u2(CHECK);
1198
1199 // Each entry is a u2 start_pc, and a u2 line_number
1200 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1201
1202 // Verify line number attribute and table length
1203 check_property(
1204 code_attribute_length == sizeof(u2) + length_in_bytes,
1205 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1206
1207 cfs->guarantee_more(length_in_bytes, CHECK);
1208
1209 if ((*write_stream) == NULL) {
1210 if (length_in_bytes > fixed_buffer_size) {
1211 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1212 } else {
1213 (*write_stream) = new CompressedLineNumberWriteStream(
1214 linenumbertable_buffer, fixed_buffer_size);
1215 }
1216 }
1217
1218 while (num_entries-- > 0) {
1219 u2 bci = cfs->get_u2_fast(); // start_pc
1220 u2 line = cfs->get_u2_fast(); // line_number
1221 guarantee_property(bci < code_length,
1222 "Invalid pc in LineNumberTable in class file %s", CHECK);
1223 (*write_stream)->write_pair(bci, line);
1224 }
1225 }
1226
1227
1228 // Class file LocalVariableTable elements.
1229 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1230 public:
1231 u2 start_bci;
1232 u2 length;
1233 u2 name_cp_index;
1234 u2 descriptor_cp_index;
1235 u2 slot;
1236 };
1237
1238
1239 class LVT_Hash: public CHeapObj {
1240 public:
1241 LocalVariableTableElement *_elem; // element
1242 LVT_Hash* _next; // Next entry in hash table
1243 };
1244
1245 unsigned int hash(LocalVariableTableElement *elem) {
1246 unsigned int raw_hash = elem->start_bci;
1247
1248 raw_hash = elem->length + raw_hash * 37;
1249 raw_hash = elem->name_cp_index + raw_hash * 37;
1250 raw_hash = elem->slot + raw_hash * 37;
1251
1252 return raw_hash % HASH_ROW_SIZE;
1253 }
1254
1255 void initialize_hashtable(LVT_Hash** table) {
1256 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1257 table[i] = NULL;
1258 }
1259 }
1260
1261 void clear_hashtable(LVT_Hash** table) {
1262 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1263 LVT_Hash* current = table[i];
1264 LVT_Hash* next;
1265 while (current != NULL) {
1266 next = current->_next;
1267 current->_next = NULL;
1268 delete(current);
1269 current = next;
1270 }
1271 table[i] = NULL;
1272 }
1273 }
1274
1275 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1276 LVT_Hash* entry = table[index];
1277
1278 /*
1279 * 3-tuple start_bci/length/slot has to be unique key,
1280 * so the following comparison seems to be redundant:
1281 * && elem->name_cp_index == entry->_elem->name_cp_index
1282 */
1283 while (entry != NULL) {
1284 if (elem->start_bci == entry->_elem->start_bci
1285 && elem->length == entry->_elem->length
1286 && elem->name_cp_index == entry->_elem->name_cp_index
1287 && elem->slot == entry->_elem->slot
1288 ) {
1289 return entry;
1290 }
1291 entry = entry->_next;
1292 }
1293 return NULL;
1294 }
1295
1296 // Return false if the local variable is found in table.
1297 // Return true if no duplicate is found.
1298 // And local variable is added as a new entry in table.
1299 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1300 // First lookup for duplicates
1301 int index = hash(elem);
1302 LVT_Hash* entry = LVT_lookup(elem, index, table);
1303
1304 if (entry != NULL) {
1305 return false;
1306 }
1307 // No duplicate is found, allocate a new entry and fill it.
1308 if ((entry = new LVT_Hash()) == NULL) {
1309 return false;
1310 }
1311 entry->_elem = elem;
1312
1313 // Insert into hash table
1314 entry->_next = table[index];
1315 table[index] = entry;
1316
1317 return true;
1318 }
1319
1320 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1321 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1322 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1323 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1324 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1325 lvt->signature_cp_index = 0;
1326 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1327 }
1328
1329 // Function is used to parse both attributes:
1330 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1331 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1332 u2 max_locals,
1333 u4 code_attribute_length,
1334 constantPoolHandle cp,
1335 u2* localvariable_table_length,
1336 bool isLVTT,
1337 TRAPS) {
1338 ClassFileStream* cfs = stream();
1339 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1340 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1341 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1342 // Verify local variable table attribute has right length
1343 if (_need_verify) {
1344 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1345 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1346 }
1347 u2* localvariable_table_start = cfs->get_u2_buffer();
1348 assert(localvariable_table_start != NULL, "null local variable table");
1349 if (!_need_verify) {
1350 cfs->skip_u2_fast(size);
1351 } else {
1352 cfs->guarantee_more(size * 2, CHECK_NULL);
1353 for(int i = 0; i < (*localvariable_table_length); i++) {
1354 u2 start_pc = cfs->get_u2_fast();
1355 u2 length = cfs->get_u2_fast();
1356 u2 name_index = cfs->get_u2_fast();
1357 u2 descriptor_index = cfs->get_u2_fast();
1358 u2 index = cfs->get_u2_fast();
1359 // Assign to a u4 to avoid overflow
1360 u4 end_pc = (u4)start_pc + (u4)length;
1361
1362 if (start_pc >= code_length) {
1363 classfile_parse_error(
1364 "Invalid start_pc %u in %s in class file %s",
1365 start_pc, tbl_name, CHECK_NULL);
1366 }
1367 if (end_pc > code_length) {
1368 classfile_parse_error(
1369 "Invalid length %u in %s in class file %s",
1370 length, tbl_name, CHECK_NULL);
1371 }
1372 int cp_size = cp->length();
1373 guarantee_property(
1374 valid_cp_range(name_index, cp_size) &&
1375 cp->tag_at(name_index).is_utf8(),
1376 "Name index %u in %s has bad constant type in class file %s",
1377 name_index, tbl_name, CHECK_NULL);
1378 guarantee_property(
1379 valid_cp_range(descriptor_index, cp_size) &&
1380 cp->tag_at(descriptor_index).is_utf8(),
1381 "Signature index %u in %s has bad constant type in class file %s",
1382 descriptor_index, tbl_name, CHECK_NULL);
1383
1384 symbolHandle name(THREAD, cp->symbol_at(name_index));
1385 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1386 verify_legal_field_name(name, CHECK_NULL);
1387 u2 extra_slot = 0;
1388 if (!isLVTT) {
1389 verify_legal_field_signature(name, sig, CHECK_NULL);
1390
1391 // 4894874: check special cases for double and long local variables
1392 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1393 sig() == vmSymbols::type_signature(T_LONG)) {
1394 extra_slot = 1;
1395 }
1396 }
1397 guarantee_property((index + extra_slot) < max_locals,
1398 "Invalid index %u in %s in class file %s",
1399 index, tbl_name, CHECK_NULL);
1400 }
1401 }
1402 return localvariable_table_start;
1403 }
1404
1405
1406 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1407 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1408 ClassFileStream* cfs = stream();
1409 u2 index = 0; // index in the array with long/double occupying two slots
1410 u4 i1 = *u1_index;
1411 u4 i2 = *u2_index + 1;
1412 for(int i = 0; i < array_length; i++) {
1413 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1414 index++;
1415 if (tag == ITEM_Long || tag == ITEM_Double) {
1416 index++;
1417 } else if (tag == ITEM_Object) {
1418 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1419 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1420 is_klass_reference(cp, class_index),
1421 "Bad class index %u in StackMap in class file %s",
1422 class_index, CHECK);
1423 } else if (tag == ITEM_Uninitialized) {
1424 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1425 guarantee_property(
1426 offset < code_length,
1427 "Bad uninitialized type offset %u in StackMap in class file %s",
1428 offset, CHECK);
1429 } else {
1430 guarantee_property(
1431 tag <= (u1)ITEM_Uninitialized,
1432 "Unknown variable type %u in StackMap in class file %s",
1433 tag, CHECK);
1434 }
1435 }
1436 u2_array[*u2_index] = index;
1437 *u1_index = i1;
1438 *u2_index = i2;
1439 }
1440
1441 typeArrayOop ClassFileParser::parse_stackmap_table(
1442 u4 code_attribute_length, TRAPS) {
1443 if (code_attribute_length == 0)
1444 return NULL;
1445
1446 ClassFileStream* cfs = stream();
1447 u1* stackmap_table_start = cfs->get_u1_buffer();
1448 assert(stackmap_table_start != NULL, "null stackmap table");
1449
1450 // check code_attribute_length first
1451 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1452
1453 if (!_need_verify && !DumpSharedSpaces) {
1454 return NULL;
1455 }
1456
1457 typeArrayOop stackmap_data =
1458 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1459
1460 stackmap_data->set_length(code_attribute_length);
1461 memcpy((void*)stackmap_data->byte_at_addr(0),
1462 (void*)stackmap_table_start, code_attribute_length);
1463 return stackmap_data;
1464 }
1465
1466 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1467 u4 method_attribute_length,
1468 constantPoolHandle cp, TRAPS) {
1469 ClassFileStream* cfs = stream();
1470 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1471 *checked_exceptions_length = cfs->get_u2_fast();
1472 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1473 u2* checked_exceptions_start = cfs->get_u2_buffer();
1474 assert(checked_exceptions_start != NULL, "null checked exceptions");
1475 if (!_need_verify) {
1476 cfs->skip_u2_fast(size);
1477 } else {
1478 // Verify each value in the checked exception table
1479 u2 checked_exception;
1480 u2 len = *checked_exceptions_length;
1481 cfs->guarantee_more(2 * len, CHECK_NULL);
1482 for (int i = 0; i < len; i++) {
1483 checked_exception = cfs->get_u2_fast();
1484 check_property(
1485 valid_cp_range(checked_exception, cp->length()) &&
1486 is_klass_reference(cp, checked_exception),
1487 "Exception name has bad type at constant pool %u in class file %s",
1488 checked_exception, CHECK_NULL);
1489 }
1490 }
1491 // check exceptions attribute length
1492 if (_need_verify) {
1493 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1494 sizeof(u2) * size),
1495 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1496 }
1497 return checked_exceptions_start;
1498 }
1499
1500 void ClassFileParser::throwIllegalSignature(
1501 const char* type, symbolHandle name, symbolHandle sig, TRAPS) {
1502 ResourceMark rm(THREAD);
1503 Exceptions::fthrow(THREAD_AND_LOCATION,
1504 vmSymbols::java_lang_ClassFormatError(),
1505 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1506 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1507 }
1508
1509 #define MAX_ARGS_SIZE 255
1510 #define MAX_CODE_SIZE 65535
1511 #define INITIAL_MAX_LVT_NUMBER 256
1512
1513 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1514 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1515 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1516 // entire method attribute is parsed.
1517 //
1518 // The promoted_flags parameter is used to pass relevant access_flags
1519 // from the method back up to the containing klass. These flag values
1520 // are added to klass's access_flags.
1521
1522 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1523 AccessFlags *promoted_flags,
1524 typeArrayHandle* method_annotations,
1525 typeArrayHandle* method_parameter_annotations,
1526 typeArrayHandle* method_default_annotations,
1527 TRAPS) {
1528 ClassFileStream* cfs = stream();
1529 methodHandle nullHandle;
1530 ResourceMark rm(THREAD);
1531 // Parse fixed parts
1532 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1533
1534 int flags = cfs->get_u2_fast();
1535 u2 name_index = cfs->get_u2_fast();
1536 int cp_size = cp->length();
1537 check_property(
1538 valid_cp_range(name_index, cp_size) &&
1539 cp->tag_at(name_index).is_utf8(),
1540 "Illegal constant pool index %u for method name in class file %s",
1541 name_index, CHECK_(nullHandle));
1542 symbolHandle name(THREAD, cp->symbol_at(name_index));
1543 verify_legal_method_name(name, CHECK_(nullHandle));
1544
1545 u2 signature_index = cfs->get_u2_fast();
1546 guarantee_property(
1547 valid_cp_range(signature_index, cp_size) &&
1548 cp->tag_at(signature_index).is_utf8(),
1549 "Illegal constant pool index %u for method signature in class file %s",
1550 signature_index, CHECK_(nullHandle));
1551 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1552
1553 AccessFlags access_flags;
1554 if (name == vmSymbols::class_initializer_name()) {
1555 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1556 flags = JVM_ACC_STATIC;
1557 } else {
1558 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1559 }
1560
1561 int args_size = -1; // only used when _need_verify is true
1562 if (_need_verify) {
1563 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1564 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1565 if (args_size > MAX_ARGS_SIZE) {
1566 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1567 }
1568 }
1569
1570 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1571
1572 // Default values for code and exceptions attribute elements
1573 u2 max_stack = 0;
1574 u2 max_locals = 0;
1575 u4 code_length = 0;
1576 u1* code_start = 0;
1577 u2 exception_table_length = 0;
1578 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1579 u2 checked_exceptions_length = 0;
1580 u2* checked_exceptions_start = NULL;
1581 CompressedLineNumberWriteStream* linenumber_table = NULL;
1582 int linenumber_table_length = 0;
1583 int total_lvt_length = 0;
1584 u2 lvt_cnt = 0;
1585 u2 lvtt_cnt = 0;
1586 bool lvt_allocated = false;
1587 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1588 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1589 u2* localvariable_table_length;
1590 u2** localvariable_table_start;
1591 u2* localvariable_type_table_length;
1592 u2** localvariable_type_table_start;
1593 bool parsed_code_attribute = false;
1594 bool parsed_checked_exceptions_attribute = false;
1595 bool parsed_stackmap_attribute = false;
1596 // stackmap attribute - JDK1.5
1597 typeArrayHandle stackmap_data;
1598 u2 generic_signature_index = 0;
1599 u1* runtime_visible_annotations = NULL;
1600 int runtime_visible_annotations_length = 0;
1601 u1* runtime_invisible_annotations = NULL;
1602 int runtime_invisible_annotations_length = 0;
1603 u1* runtime_visible_parameter_annotations = NULL;
1604 int runtime_visible_parameter_annotations_length = 0;
1605 u1* runtime_invisible_parameter_annotations = NULL;
1606 int runtime_invisible_parameter_annotations_length = 0;
1607 u1* annotation_default = NULL;
1608 int annotation_default_length = 0;
1609
1610 // Parse code and exceptions attribute
1611 u2 method_attributes_count = cfs->get_u2_fast();
1612 while (method_attributes_count--) {
1613 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1614 u2 method_attribute_name_index = cfs->get_u2_fast();
1615 u4 method_attribute_length = cfs->get_u4_fast();
1616 check_property(
1617 valid_cp_range(method_attribute_name_index, cp_size) &&
1618 cp->tag_at(method_attribute_name_index).is_utf8(),
1619 "Invalid method attribute name index %u in class file %s",
1620 method_attribute_name_index, CHECK_(nullHandle));
1621
1622 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1623 if (method_attribute_name == vmSymbols::tag_code()) {
1624 // Parse Code attribute
1625 if (_need_verify) {
1626 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1627 "Code attribute in native or abstract methods in class file %s",
1628 CHECK_(nullHandle));
1629 }
1630 if (parsed_code_attribute) {
1631 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1632 }
1633 parsed_code_attribute = true;
1634
1635 // Stack size, locals size, and code size
1636 if (_major_version == 45 && _minor_version <= 2) {
1637 cfs->guarantee_more(4, CHECK_(nullHandle));
1638 max_stack = cfs->get_u1_fast();
1639 max_locals = cfs->get_u1_fast();
1640 code_length = cfs->get_u2_fast();
1641 } else {
1642 cfs->guarantee_more(8, CHECK_(nullHandle));
1643 max_stack = cfs->get_u2_fast();
1644 max_locals = cfs->get_u2_fast();
1645 code_length = cfs->get_u4_fast();
1646 }
1647 if (_need_verify) {
1648 guarantee_property(args_size <= max_locals,
1649 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1650 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1651 "Invalid method Code length %u in class file %s",
1652 code_length, CHECK_(nullHandle));
1653 }
1654 // Code pointer
1655 code_start = cfs->get_u1_buffer();
1656 assert(code_start != NULL, "null code start");
1657 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1658 cfs->skip_u1_fast(code_length);
1659
1660 // Exception handler table
1661 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1662 exception_table_length = cfs->get_u2_fast();
1663 if (exception_table_length > 0) {
1664 exception_handlers =
1665 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1666 }
1667
1668 // Parse additional attributes in code attribute
1669 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1670 u2 code_attributes_count = cfs->get_u2_fast();
1671
1672 unsigned int calculated_attribute_length = 0;
1673
1674 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1675 calculated_attribute_length =
1676 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1677 } else {
1678 // max_stack, locals and length are smaller in pre-version 45.2 classes
1679 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1680 }
1681 calculated_attribute_length +=
1682 code_length +
1683 sizeof(exception_table_length) +
1684 sizeof(code_attributes_count) +
1685 exception_table_length *
1686 ( sizeof(u2) + // start_pc
1687 sizeof(u2) + // end_pc
1688 sizeof(u2) + // handler_pc
1689 sizeof(u2) ); // catch_type_index
1690
1691 while (code_attributes_count--) {
1692 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1693 u2 code_attribute_name_index = cfs->get_u2_fast();
1694 u4 code_attribute_length = cfs->get_u4_fast();
1695 calculated_attribute_length += code_attribute_length +
1696 sizeof(code_attribute_name_index) +
1697 sizeof(code_attribute_length);
1698 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1699 cp->tag_at(code_attribute_name_index).is_utf8(),
1700 "Invalid code attribute name index %u in class file %s",
1701 code_attribute_name_index,
1702 CHECK_(nullHandle));
1703 if (LoadLineNumberTables &&
1704 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1705 // Parse and compress line number table
1706 parse_linenumber_table(code_attribute_length, code_length,
1707 &linenumber_table, CHECK_(nullHandle));
1708
1709 } else if (LoadLocalVariableTables &&
1710 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1711 // Parse local variable table
1712 if (!lvt_allocated) {
1713 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1714 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1715 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1716 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1717 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1718 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1719 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1720 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1721 lvt_allocated = true;
1722 }
1723 if (lvt_cnt == max_lvt_cnt) {
1724 max_lvt_cnt <<= 1;
1725 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1726 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1727 }
1728 localvariable_table_start[lvt_cnt] =
1729 parse_localvariable_table(code_length,
1730 max_locals,
1731 code_attribute_length,
1732 cp,
1733 &localvariable_table_length[lvt_cnt],
1734 false, // is not LVTT
1735 CHECK_(nullHandle));
1736 total_lvt_length += localvariable_table_length[lvt_cnt];
1737 lvt_cnt++;
1738 } else if (LoadLocalVariableTypeTables &&
1739 _major_version >= JAVA_1_5_VERSION &&
1740 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1741 if (!lvt_allocated) {
1742 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1743 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1744 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1745 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1746 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1747 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1748 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1749 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1750 lvt_allocated = true;
1751 }
1752 // Parse local variable type table
1753 if (lvtt_cnt == max_lvtt_cnt) {
1754 max_lvtt_cnt <<= 1;
1755 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1756 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1757 }
1758 localvariable_type_table_start[lvtt_cnt] =
1759 parse_localvariable_table(code_length,
1760 max_locals,
1761 code_attribute_length,
1762 cp,
1763 &localvariable_type_table_length[lvtt_cnt],
1764 true, // is LVTT
1765 CHECK_(nullHandle));
1766 lvtt_cnt++;
1767 } else if (UseSplitVerifier &&
1768 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1769 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1770 // Stack map is only needed by the new verifier in JDK1.5.
1771 if (parsed_stackmap_attribute) {
1772 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1773 }
1774 typeArrayOop sm =
1775 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1776 stackmap_data = typeArrayHandle(THREAD, sm);
1777 parsed_stackmap_attribute = true;
1778 } else {
1779 // Skip unknown attributes
1780 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1781 }
1782 }
1783 // check method attribute length
1784 if (_need_verify) {
1785 guarantee_property(method_attribute_length == calculated_attribute_length,
1786 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1787 }
1788 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1789 // Parse Exceptions attribute
1790 if (parsed_checked_exceptions_attribute) {
1791 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1792 }
1793 parsed_checked_exceptions_attribute = true;
1794 checked_exceptions_start =
1795 parse_checked_exceptions(&checked_exceptions_length,
1796 method_attribute_length,
1797 cp, CHECK_(nullHandle));
1798 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1799 if (method_attribute_length != 0) {
1800 classfile_parse_error(
1801 "Invalid Synthetic method attribute length %u in class file %s",
1802 method_attribute_length, CHECK_(nullHandle));
1803 }
1804 // Should we check that there hasn't already been a synthetic attribute?
1805 access_flags.set_is_synthetic();
1806 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1807 if (method_attribute_length != 0) {
1808 classfile_parse_error(
1809 "Invalid Deprecated method attribute length %u in class file %s",
1810 method_attribute_length, CHECK_(nullHandle));
1811 }
1812 } else if (_major_version >= JAVA_1_5_VERSION) {
1813 if (method_attribute_name == vmSymbols::tag_signature()) {
1814 if (method_attribute_length != 2) {
1815 classfile_parse_error(
1816 "Invalid Signature attribute length %u in class file %s",
1817 method_attribute_length, CHECK_(nullHandle));
1818 }
1819 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1820 generic_signature_index = cfs->get_u2_fast();
1821 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1822 runtime_visible_annotations_length = method_attribute_length;
1823 runtime_visible_annotations = cfs->get_u1_buffer();
1824 assert(runtime_visible_annotations != NULL, "null visible annotations");
1825 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1826 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1827 runtime_invisible_annotations_length = method_attribute_length;
1828 runtime_invisible_annotations = cfs->get_u1_buffer();
1829 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1830 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1831 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1832 runtime_visible_parameter_annotations_length = method_attribute_length;
1833 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1834 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1835 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1836 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1837 runtime_invisible_parameter_annotations_length = method_attribute_length;
1838 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1839 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1840 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1841 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1842 annotation_default_length = method_attribute_length;
1843 annotation_default = cfs->get_u1_buffer();
1844 assert(annotation_default != NULL, "null annotation default");
1845 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1846 } else {
1847 // Skip unknown attributes
1848 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1849 }
1850 } else {
1851 // Skip unknown attributes
1852 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1853 }
1854 }
1855
1856 if (linenumber_table != NULL) {
1857 linenumber_table->write_terminator();
1858 linenumber_table_length = linenumber_table->position();
1859 }
1860
1861 // Make sure there's at least one Code attribute in non-native/non-abstract method
1862 if (_need_verify) {
1863 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1864 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1865 }
1866
1867 // All sizing information for a methodOop is finally available, now create it
1868 methodOop m_oop = oopFactory::new_method(
1869 code_length, access_flags, linenumber_table_length,
1870 total_lvt_length, checked_exceptions_length,
1871 methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1872 methodHandle m (THREAD, m_oop);
1873
1874 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1875
1876 // Fill in information from fixed part (access_flags already set)
1877 m->set_constants(cp());
1878 m->set_name_index(name_index);
1879 m->set_signature_index(signature_index);
1880 m->set_generic_signature_index(generic_signature_index);
1881 #ifdef CC_INTERP
1882 // hmm is there a gc issue here??
1883 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1884 m->set_result_index(rtf.type());
1885 #endif
1886
1887 if (args_size >= 0) {
1888 m->set_size_of_parameters(args_size);
1889 } else {
1890 m->compute_size_of_parameters(THREAD);
1891 }
1892 #ifdef ASSERT
1893 if (args_size >= 0) {
1894 m->compute_size_of_parameters(THREAD);
1895 assert(args_size == m->size_of_parameters(), "");
1896 }
1897 #endif
1898
1899 // Fill in code attribute information
1900 m->set_max_stack(max_stack);
1901 m->set_max_locals(max_locals);
1902 m->constMethod()->set_stackmap_data(stackmap_data());
1903
1904 /**
1905 * The exception_table field is the flag used to indicate
1906 * that the methodOop and it's associated constMethodOop are partially
1907 * initialized and thus are exempt from pre/post GC verification. Once
1908 * the field is set, the oops are considered fully initialized so make
1909 * sure that the oops can pass verification when this field is set.
1910 */
1911 m->set_exception_table(exception_handlers());
1912
1913 // Copy byte codes
1914 m->set_code(code_start);
1915
1916 // Copy line number table
1917 if (linenumber_table != NULL) {
1918 memcpy(m->compressed_linenumber_table(),
1919 linenumber_table->buffer(), linenumber_table_length);
1920 }
1921
1922 // Copy checked exceptions
1923 if (checked_exceptions_length > 0) {
1924 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1925 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1926 }
1927
1928 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1929 *
1930 * Rules for LVT's and LVTT's are:
1931 * - There can be any number of LVT's and LVTT's.
1932 * - If there are n LVT's, it is the same as if there was just
1933 * one LVT containing all the entries from the n LVT's.
1934 * - There may be no more than one LVT entry per local variable.
1935 * Two LVT entries are 'equal' if these fields are the same:
1936 * start_pc, length, name, slot
1937 * - There may be no more than one LVTT entry per each LVT entry.
1938 * Each LVTT entry has to match some LVT entry.
1939 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1940 */
1941 if (total_lvt_length > 0) {
1942 int tbl_no, idx;
1943
1944 promoted_flags->set_has_localvariable_table();
1945
1946 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1947 initialize_hashtable(lvt_Hash);
1948
1949 // To fill LocalVariableTable in
1950 Classfile_LVT_Element* cf_lvt;
1951 LocalVariableTableElement* lvt = m->localvariable_table_start();
1952
1953 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1954 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1955 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1956 copy_lvt_element(&cf_lvt[idx], lvt);
1957 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1958 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1959 && _need_verify
1960 && _major_version >= JAVA_1_5_VERSION ) {
1961 clear_hashtable(lvt_Hash);
1962 classfile_parse_error("Duplicated LocalVariableTable attribute "
1963 "entry for '%s' in class file %s",
1964 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1965 CHECK_(nullHandle));
1966 }
1967 }
1968 }
1969
1970 // To merge LocalVariableTable and LocalVariableTypeTable
1971 Classfile_LVT_Element* cf_lvtt;
1972 LocalVariableTableElement lvtt_elem;
1973
1974 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1975 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1976 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1977 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1978 int index = hash(&lvtt_elem);
1979 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1980 if (entry == NULL) {
1981 if (_need_verify) {
1982 clear_hashtable(lvt_Hash);
1983 classfile_parse_error("LVTT entry for '%s' in class file %s "
1984 "does not match any LVT entry",
1985 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1986 CHECK_(nullHandle));
1987 }
1988 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1989 clear_hashtable(lvt_Hash);
1990 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1991 "entry for '%s' in class file %s",
1992 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1993 CHECK_(nullHandle));
1994 } else {
1995 // to add generic signatures into LocalVariableTable
1996 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1997 }
1998 }
1999 }
2000 clear_hashtable(lvt_Hash);
2001 }
2002
2003 *method_annotations = assemble_annotations(runtime_visible_annotations,
2004 runtime_visible_annotations_length,
2005 runtime_invisible_annotations,
2006 runtime_invisible_annotations_length,
2007 CHECK_(nullHandle));
2008 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2009 runtime_visible_parameter_annotations_length,
2010 runtime_invisible_parameter_annotations,
2011 runtime_invisible_parameter_annotations_length,
2012 CHECK_(nullHandle));
2013 *method_default_annotations = assemble_annotations(annotation_default,
2014 annotation_default_length,
2015 NULL,
2016 0,
2017 CHECK_(nullHandle));
2018
2019 if (name() == vmSymbols::finalize_method_name() &&
2020 signature() == vmSymbols::void_method_signature()) {
2021 if (m->is_empty_method()) {
2022 _has_empty_finalizer = true;
2023 } else {
2024 _has_finalizer = true;
2025 }
2026 }
2027 if (name() == vmSymbols::object_initializer_name() &&
2028 signature() == vmSymbols::void_method_signature() &&
2029 m->is_vanilla_constructor()) {
2030 _has_vanilla_constructor = true;
2031 }
2032
2033 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2034 m->is_method_handle_adapter())) {
2035 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2036 "Method handle invokers must be defined internally to the VM", nullHandle);
2037 }
2038
2039 return m;
2040 }
2041
2042
2043 // The promoted_flags parameter is used to pass relevant access_flags
2044 // from the methods back up to the containing klass. These flag values
2045 // are added to klass's access_flags.
2046
2047 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2048 AccessFlags* promoted_flags,
2049 bool* has_final_method,
2050 objArrayOop* methods_annotations_oop,
2051 objArrayOop* methods_parameter_annotations_oop,
2052 objArrayOop* methods_default_annotations_oop,
2053 TRAPS) {
2054 ClassFileStream* cfs = stream();
2055 objArrayHandle nullHandle;
2056 typeArrayHandle method_annotations;
2057 typeArrayHandle method_parameter_annotations;
2058 typeArrayHandle method_default_annotations;
2059 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2060 u2 length = cfs->get_u2_fast();
2061 if (length == 0) {
2062 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2063 } else {
2064 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2065 objArrayHandle methods(THREAD, m);
2066 HandleMark hm(THREAD);
2067 objArrayHandle methods_annotations;
2068 objArrayHandle methods_parameter_annotations;
2069 objArrayHandle methods_default_annotations;
2070 for (int index = 0; index < length; index++) {
2071 methodHandle method = parse_method(cp, is_interface,
2072 promoted_flags,
2073 &method_annotations,
2074 &method_parameter_annotations,
2075 &method_default_annotations,
2076 CHECK_(nullHandle));
2077 if (method->is_final()) {
2078 *has_final_method = true;
2079 }
2080 methods->obj_at_put(index, method());
2081 if (method_annotations.not_null()) {
2082 if (methods_annotations.is_null()) {
2083 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2084 methods_annotations = objArrayHandle(THREAD, md);
2085 }
2086 methods_annotations->obj_at_put(index, method_annotations());
2087 }
2088 if (method_parameter_annotations.not_null()) {
2089 if (methods_parameter_annotations.is_null()) {
2090 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2091 methods_parameter_annotations = objArrayHandle(THREAD, md);
2092 }
2093 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2094 }
2095 if (method_default_annotations.not_null()) {
2096 if (methods_default_annotations.is_null()) {
2097 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2098 methods_default_annotations = objArrayHandle(THREAD, md);
2099 }
2100 methods_default_annotations->obj_at_put(index, method_default_annotations());
2101 }
2102 }
2103 if (_need_verify && length > 1) {
2104 // Check duplicated methods
2105 ResourceMark rm(THREAD);
2106 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2107 THREAD, NameSigHash*, HASH_ROW_SIZE);
2108 initialize_hashtable(names_and_sigs);
2109 bool dup = false;
2110 {
2111 debug_only(No_Safepoint_Verifier nsv;)
2112 for (int i = 0; i < length; i++) {
2113 methodOop m = (methodOop)methods->obj_at(i);
2114 // If no duplicates, add name/signature in hashtable names_and_sigs.
2115 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2116 dup = true;
2117 break;
2118 }
2119 }
2120 }
2121 if (dup) {
2122 classfile_parse_error("Duplicate method name&signature in class file %s",
2123 CHECK_(nullHandle));
2124 }
2125 }
2126
2127 *methods_annotations_oop = methods_annotations();
2128 *methods_parameter_annotations_oop = methods_parameter_annotations();
2129 *methods_default_annotations_oop = methods_default_annotations();
2130
2131 return methods;
2132 }
2133 }
2134
2135
2136 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2137 objArrayHandle methods_annotations,
2138 objArrayHandle methods_parameter_annotations,
2139 objArrayHandle methods_default_annotations,
2140 TRAPS) {
2141 typeArrayHandle nullHandle;
2142 int length = methods()->length();
2143 // If JVMTI original method ordering is enabled we have to
2144 // remember the original class file ordering.
2145 // We temporarily use the vtable_index field in the methodOop to store the
2146 // class file index, so we can read in after calling qsort.
2147 if (JvmtiExport::can_maintain_original_method_order()) {
2148 for (int index = 0; index < length; index++) {
2149 methodOop m = methodOop(methods->obj_at(index));
2150 assert(!m->valid_vtable_index(), "vtable index should not be set");
2151 m->set_vtable_index(index);
2152 }
2153 }
2154 // Sort method array by ascending method name (for faster lookups & vtable construction)
2155 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
2156 methodOopDesc::sort_methods(methods(),
2157 methods_annotations(),
2158 methods_parameter_annotations(),
2159 methods_default_annotations());
2160
2161 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2162 if (JvmtiExport::can_maintain_original_method_order()) {
2163 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2164 typeArrayHandle method_ordering(THREAD, new_ordering);
2165 for (int index = 0; index < length; index++) {
2166 methodOop m = methodOop(methods->obj_at(index));
2167 int old_index = m->vtable_index();
2168 assert(old_index >= 0 && old_index < length, "invalid method index");
2169 method_ordering->int_at_put(index, old_index);
2170 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2171 }
2172 return method_ordering;
2173 } else {
2174 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2175 }
2176 }
2177
2178
2179 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2180 ClassFileStream* cfs = stream();
2181 cfs->guarantee_more(2, CHECK); // sourcefile_index
2182 u2 sourcefile_index = cfs->get_u2_fast();
2183 check_property(
2184 valid_cp_range(sourcefile_index, cp->length()) &&
2185 cp->tag_at(sourcefile_index).is_utf8(),
2186 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2187 sourcefile_index, CHECK);
2188 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2189 }
2190
2191
2192
2193 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2194 instanceKlassHandle k,
2195 int length, TRAPS) {
2196 ClassFileStream* cfs = stream();
2197 u1* sde_buffer = cfs->get_u1_buffer();
2198 assert(sde_buffer != NULL, "null sde buffer");
2199
2200 // Don't bother storing it if there is no way to retrieve it
2201 if (JvmtiExport::can_get_source_debug_extension()) {
2202 // Optimistically assume that only 1 byte UTF format is used
2203 // (common case)
2204 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2205 length, CHECK);
2206 k->set_source_debug_extension(sde_symbol);
2207 }
2208 // Got utf8 string, set stream position forward
2209 cfs->skip_u1(length, CHECK);
2210 }
2211
2212
2213 // Inner classes can be static, private or protected (classic VM does this)
2214 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2215
2216 // Return number of classes in the inner classes attribute table
2217 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2218 ClassFileStream* cfs = stream();
2219 cfs->guarantee_more(2, CHECK_0); // length
2220 u2 length = cfs->get_u2_fast();
2221
2222 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2223 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2224 typeArrayHandle inner_classes(THREAD, ic);
2225 int index = 0;
2226 int cp_size = cp->length();
2227 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2228 for (int n = 0; n < length; n++) {
2229 // Inner class index
2230 u2 inner_class_info_index = cfs->get_u2_fast();
2231 check_property(
2232 inner_class_info_index == 0 ||
2233 (valid_cp_range(inner_class_info_index, cp_size) &&
2234 is_klass_reference(cp, inner_class_info_index)),
2235 "inner_class_info_index %u has bad constant type in class file %s",
2236 inner_class_info_index, CHECK_0);
2237 // Outer class index
2238 u2 outer_class_info_index = cfs->get_u2_fast();
2239 check_property(
2240 outer_class_info_index == 0 ||
2241 (valid_cp_range(outer_class_info_index, cp_size) &&
2242 is_klass_reference(cp, outer_class_info_index)),
2243 "outer_class_info_index %u has bad constant type in class file %s",
2244 outer_class_info_index, CHECK_0);
2245 // Inner class name
2246 u2 inner_name_index = cfs->get_u2_fast();
2247 check_property(
2248 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2249 cp->tag_at(inner_name_index).is_utf8()),
2250 "inner_name_index %u has bad constant type in class file %s",
2251 inner_name_index, CHECK_0);
2252 if (_need_verify) {
2253 guarantee_property(inner_class_info_index != outer_class_info_index,
2254 "Class is both outer and inner class in class file %s", CHECK_0);
2255 }
2256 // Access flags
2257 AccessFlags inner_access_flags;
2258 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2259 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2260 // Set abstract bit for old class files for backward compatibility
2261 flags |= JVM_ACC_ABSTRACT;
2262 }
2263 verify_legal_class_modifiers(flags, CHECK_0);
2264 inner_access_flags.set_flags(flags);
2265
2266 inner_classes->short_at_put(index++, inner_class_info_index);
2267 inner_classes->short_at_put(index++, outer_class_info_index);
2268 inner_classes->short_at_put(index++, inner_name_index);
2269 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2270 }
2271
2272 // 4347400: make sure there's no duplicate entry in the classes array
2273 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2274 for(int i = 0; i < inner_classes->length(); i += 4) {
2275 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2276 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2277 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2278 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2279 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2280 "Duplicate entry in InnerClasses in class file %s",
2281 CHECK_0);
2282 }
2283 }
2284 }
2285
2286 // Update instanceKlass with inner class info.
2287 k->set_inner_classes(inner_classes());
2288 return length;
2289 }
2290
2291 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2292 k->set_is_synthetic();
2293 }
2294
2295 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2296 ClassFileStream* cfs = stream();
2297 u2 signature_index = cfs->get_u2(CHECK);
2298 check_property(
2299 valid_cp_range(signature_index, cp->length()) &&
2300 cp->tag_at(signature_index).is_utf8(),
2301 "Invalid constant pool index %u in Signature attribute in class file %s",
2302 signature_index, CHECK);
2303 k->set_generic_signature(cp->symbol_at(signature_index));
2304 }
2305
2306 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2307 ClassFileStream* cfs = stream();
2308 // Set inner classes attribute to default sentinel
2309 k->set_inner_classes(Universe::the_empty_short_array());
2310 cfs->guarantee_more(2, CHECK); // attributes_count
2311 u2 attributes_count = cfs->get_u2_fast();
2312 bool parsed_sourcefile_attribute = false;
2313 bool parsed_innerclasses_attribute = false;
2314 bool parsed_enclosingmethod_attribute = false;
2315 u1* runtime_visible_annotations = NULL;
2316 int runtime_visible_annotations_length = 0;
2317 u1* runtime_invisible_annotations = NULL;
2318 int runtime_invisible_annotations_length = 0;
2319 // Iterate over attributes
2320 while (attributes_count--) {
2321 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2322 u2 attribute_name_index = cfs->get_u2_fast();
2323 u4 attribute_length = cfs->get_u4_fast();
2324 check_property(
2325 valid_cp_range(attribute_name_index, cp->length()) &&
2326 cp->tag_at(attribute_name_index).is_utf8(),
2327 "Attribute name has bad constant pool index %u in class file %s",
2328 attribute_name_index, CHECK);
2329 symbolOop tag = cp->symbol_at(attribute_name_index);
2330 if (tag == vmSymbols::tag_source_file()) {
2331 // Check for SourceFile tag
2332 if (_need_verify) {
2333 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2334 }
2335 if (parsed_sourcefile_attribute) {
2336 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2337 } else {
2338 parsed_sourcefile_attribute = true;
2339 }
2340 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2341 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2342 // Check for SourceDebugExtension tag
2343 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2344 } else if (tag == vmSymbols::tag_inner_classes()) {
2345 // Check for InnerClasses tag
2346 if (parsed_innerclasses_attribute) {
2347 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2348 } else {
2349 parsed_innerclasses_attribute = true;
2350 }
2351 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2352 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2353 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2354 "Wrong InnerClasses attribute length in class file %s", CHECK);
2355 }
2356 } else if (tag == vmSymbols::tag_synthetic()) {
2357 // Check for Synthetic tag
2358 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2359 if (attribute_length != 0) {
2360 classfile_parse_error(
2361 "Invalid Synthetic classfile attribute length %u in class file %s",
2362 attribute_length, CHECK);
2363 }
2364 parse_classfile_synthetic_attribute(cp, k, CHECK);
2365 } else if (tag == vmSymbols::tag_deprecated()) {
2366 // Check for Deprecatd tag - 4276120
2367 if (attribute_length != 0) {
2368 classfile_parse_error(
2369 "Invalid Deprecated classfile attribute length %u in class file %s",
2370 attribute_length, CHECK);
2371 }
2372 } else if (_major_version >= JAVA_1_5_VERSION) {
2373 if (tag == vmSymbols::tag_signature()) {
2374 if (attribute_length != 2) {
2375 classfile_parse_error(
2376 "Wrong Signature attribute length %u in class file %s",
2377 attribute_length, CHECK);
2378 }
2379 parse_classfile_signature_attribute(cp, k, CHECK);
2380 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2381 runtime_visible_annotations_length = attribute_length;
2382 runtime_visible_annotations = cfs->get_u1_buffer();
2383 assert(runtime_visible_annotations != NULL, "null visible annotations");
2384 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2385 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2386 runtime_invisible_annotations_length = attribute_length;
2387 runtime_invisible_annotations = cfs->get_u1_buffer();
2388 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2389 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2390 } else if (tag == vmSymbols::tag_enclosing_method()) {
2391 if (parsed_enclosingmethod_attribute) {
2392 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2393 } else {
2394 parsed_enclosingmethod_attribute = true;
2395 }
2396 cfs->guarantee_more(4, CHECK); // class_index, method_index
2397 u2 class_index = cfs->get_u2_fast();
2398 u2 method_index = cfs->get_u2_fast();
2399 if (class_index == 0) {
2400 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2401 }
2402 // Validate the constant pool indices and types
2403 if (!cp->is_within_bounds(class_index) ||
2404 !is_klass_reference(cp, class_index)) {
2405 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2406 }
2407 if (method_index != 0 &&
2408 (!cp->is_within_bounds(method_index) ||
2409 !cp->tag_at(method_index).is_name_and_type())) {
2410 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2411 }
2412 k->set_enclosing_method_indices(class_index, method_index);
2413 } else {
2414 // Unknown attribute
2415 cfs->skip_u1(attribute_length, CHECK);
2416 }
2417 } else {
2418 // Unknown attribute
2419 cfs->skip_u1(attribute_length, CHECK);
2420 }
2421 }
2422 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2423 runtime_visible_annotations_length,
2424 runtime_invisible_annotations,
2425 runtime_invisible_annotations_length,
2426 CHECK);
2427 k->set_class_annotations(annotations());
2428 }
2429
2430
2431 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2432 int runtime_visible_annotations_length,
2433 u1* runtime_invisible_annotations,
2434 int runtime_invisible_annotations_length, TRAPS) {
2435 typeArrayHandle annotations;
2436 if (runtime_visible_annotations != NULL ||
2437 runtime_invisible_annotations != NULL) {
2438 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2439 runtime_invisible_annotations_length, CHECK_(annotations));
2440 annotations = typeArrayHandle(THREAD, anno);
2441 if (runtime_visible_annotations != NULL) {
2442 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2443 }
2444 if (runtime_invisible_annotations != NULL) {
2445 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2446 }
2447 }
2448 return annotations;
2449 }
2450
2451
2452 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2453 KlassHandle h_k (THREAD, fd->field_holder());
2454 assert(h_k.not_null() && fd->is_static(), "just checking");
2455 if (fd->has_initial_value()) {
2456 BasicType t = fd->field_type();
2457 switch (t) {
2458 case T_BYTE:
2459 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2460 break;
2461 case T_BOOLEAN:
2462 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2463 break;
2464 case T_CHAR:
2465 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2466 break;
2467 case T_SHORT:
2468 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2469 break;
2470 case T_INT:
2471 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2472 break;
2473 case T_FLOAT:
2474 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2475 break;
2476 case T_DOUBLE:
2477 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2478 break;
2479 case T_LONG:
2480 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2481 break;
2482 case T_OBJECT:
2483 {
2484 #ifdef ASSERT
2485 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2486 assert(fd->signature() == sym, "just checking");
2487 #endif
2488 oop string = fd->string_initial_value(CHECK);
2489 h_k()->obj_field_put(fd->offset(), string);
2490 }
2491 break;
2492 default:
2493 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2494 "Illegal ConstantValue attribute in class file");
2495 }
2496 }
2497 }
2498
2499
2500 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2501 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2502 // This code is for compatibility with earlier jdk's that do not
2503 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2504 // the check for the "discovered" field should issue a warning if
2505 // the field is not found. For 1.6 this code should be issue a
2506 // fatal error if the "discovered" field is not found.
2507 //
2508 // Increment fac.nonstatic_oop_count so that the start of the
2509 // next type of non-static oops leaves room for the fake oop.
2510 // Do not increment next_nonstatic_oop_offset so that the
2511 // fake oop is place after the java.lang.ref.Reference oop
2512 // fields.
2513 //
2514 // Check the fields in java.lang.ref.Reference for the "discovered"
2515 // field. If it is not present, artifically create a field for it.
2516 // This allows this VM to run on early JDK where the field is not
2517 // present.
2518
2519 //
2520 // Increment fac.nonstatic_oop_count so that the start of the
2521 // next type of non-static oops leaves room for the fake oop.
2522 // Do not increment next_nonstatic_oop_offset so that the
2523 // fake oop is place after the java.lang.ref.Reference oop
2524 // fields.
2525 //
2526 // Check the fields in java.lang.ref.Reference for the "discovered"
2527 // field. If it is not present, artifically create a field for it.
2528 // This allows this VM to run on early JDK where the field is not
2529 // present.
2530 int reference_sig_index = 0;
2531 int reference_name_index = 0;
2532 int reference_index = 0;
2533 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2534 const int n = (*fields_ptr)()->length();
2535 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2536 int name_index =
2537 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2538 int sig_index =
2539 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2540 symbolOop f_name = cp->symbol_at(name_index);
2541 symbolOop f_sig = cp->symbol_at(sig_index);
2542 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2543 // Save the index for reference signature for later use.
2544 // The fake discovered field does not entries in the
2545 // constant pool so the index for its signature cannot
2546 // be extracted from the constant pool. It will need
2547 // later, however. It's signature is vmSymbols::reference_signature()
2548 // so same an index for that signature.
2549 reference_sig_index = sig_index;
2550 reference_name_index = name_index;
2551 reference_index = i;
2552 }
2553 if (f_name == vmSymbols::reference_discovered_name() &&
2554 f_sig == vmSymbols::reference_signature()) {
2555 // The values below are fake but will force extra
2556 // non-static oop fields and a corresponding non-static
2557 // oop map block to be allocated.
2558 extra = 0;
2559 break;
2560 }
2561 }
2562 if (extra != 0) {
2563 fac_ptr->nonstatic_oop_count += extra;
2564 // Add the additional entry to "fields" so that the klass
2565 // contains the "discoverd" field and the field will be initialized
2566 // in instances of the object.
2567 int fields_with_fix_length = (*fields_ptr)()->length() +
2568 instanceKlass::next_offset;
2569 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2570 fields_with_fix_length, CHECK);
2571 typeArrayHandle fields_with_fix(THREAD, ff);
2572
2573 // Take everything from the original but the length.
2574 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2575 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2576 }
2577
2578 // Add the fake field at the end.
2579 int i = (*fields_ptr)->length();
2580 // There is no name index for the fake "discovered" field nor
2581 // signature but a signature is needed so that the field will
2582 // be properly initialized. Use one found for
2583 // one of the other reference fields. Be sure the index for the
2584 // name is 0. In fieldDescriptor::initialize() the index of the
2585 // name is checked. That check is by passed for the last nonstatic
2586 // oop field in a java.lang.ref.Reference which is assumed to be
2587 // this artificial "discovered" field. An assertion checks that
2588 // the name index is 0.
2589 assert(reference_index != 0, "Missing signature for reference");
2590
2591 int j;
2592 for (j = 0; j < instanceKlass::next_offset; j++) {
2593 fields_with_fix->ushort_at_put(i + j,
2594 (*fields_ptr)->ushort_at(reference_index +j));
2595 }
2596 // Clear the public access flag and set the private access flag.
2597 short flags;
2598 flags =
2599 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2600 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2601 flags = flags & (~JVM_ACC_PUBLIC);
2602 flags = flags | JVM_ACC_PRIVATE;
2603 AccessFlags access_flags;
2604 access_flags.set_flags(flags);
2605 assert(!access_flags.is_public(), "Failed to clear public flag");
2606 assert(access_flags.is_private(), "Failed to set private flag");
2607 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2608 flags);
2609
2610 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2611 == reference_name_index, "The fake reference name is incorrect");
2612 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2613 == reference_sig_index, "The fake reference signature is incorrect");
2614 // The type of the field is stored in the low_offset entry during
2615 // parsing.
2616 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2617 NONSTATIC_OOP, "The fake reference type is incorrect");
2618
2619 // "fields" is allocated in the permanent generation. Disgard
2620 // it and let it be collected.
2621 (*fields_ptr) = fields_with_fix;
2622 }
2623 return;
2624 }
2625
2626
2627 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2628 FieldAllocationCount *fac_ptr, TRAPS) {
2629 // Add fake fields for java.lang.Class instances
2630 //
2631 // This is not particularly nice. We should consider adding a
2632 // private transient object field at the Java level to
2633 // java.lang.Class. Alternatively we could add a subclass of
2634 // instanceKlass which provides an accessor and size computer for
2635 // this field, but that appears to be more code than this hack.
2636 //
2637 // NOTE that we wedge these in at the beginning rather than the
2638 // end of the object because the Class layout changed between JDK
2639 // 1.3 and JDK 1.4 with the new reflection implementation; some
2640 // nonstatic oop fields were added at the Java level. The offsets
2641 // of these fake fields can't change between these two JDK
2642 // versions because when the offsets are computed at bootstrap
2643 // time we don't know yet which version of the JDK we're running in.
2644
2645 // The values below are fake but will force two non-static oop fields and
2646 // a corresponding non-static oop map block to be allocated.
2647 const int extra = java_lang_Class::number_of_fake_oop_fields;
2648 fac_ptr->nonstatic_oop_count += extra;
2649 }
2650
2651
2652 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2653 // Cause the extra fake fields in java.lang.Class to show up before
2654 // the Java fields for layout compatibility between 1.3 and 1.4
2655 // Incrementing next_nonstatic_oop_offset here advances the
2656 // location where the real java fields are placed.
2657 const int extra = java_lang_Class::number_of_fake_oop_fields;
2658 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2659 }
2660
2661
2662 // Force MethodHandle.vmentry to be an unmanaged pointer.
2663 // There is no way for a classfile to express this, so we must help it.
2664 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2665 typeArrayHandle* fields_ptr,
2666 FieldAllocationCount *fac_ptr,
2667 TRAPS) {
2668 // Add fake fields for java.dyn.MethodHandle instances
2669 //
2670 // This is not particularly nice, but since there is no way to express
2671 // a native wordSize field in Java, we must do it at this level.
2672
2673 if (!EnableMethodHandles) return;
2674
2675 int word_sig_index = 0;
2676 const int cp_size = cp->length();
2677 for (int index = 1; index < cp_size; index++) {
2678 if (cp->tag_at(index).is_utf8() &&
2679 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2680 word_sig_index = index;
2681 break;
2682 }
2683 }
2684
2685 if (word_sig_index == 0)
2686 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2687 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2688
2689 bool found_vmentry = false;
2690
2691 const int n = (*fields_ptr)()->length();
2692 for (int i = 0; i < n; i += instanceKlass::next_offset) {
2693 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2694 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2695 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2696 symbolOop f_name = cp->symbol_at(name_index);
2697 symbolOop f_sig = cp->symbol_at(sig_index);
2698 if (f_sig == vmSymbols::byte_signature() &&
2699 f_name == vmSymbols::vmentry_name() &&
2700 (acc_flags & JVM_ACC_STATIC) == 0) {
2701 // Adjust the field type from byte to an unmanaged pointer.
2702 assert(fac_ptr->nonstatic_byte_count > 0, "");
2703 fac_ptr->nonstatic_byte_count -= 1;
2704 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset,
2705 word_sig_index);
2706 fac_ptr->nonstatic_word_count += 1;
2707
2708 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset);
2709 assert(atype == NONSTATIC_BYTE, "");
2710 FieldAllocationType new_atype = NONSTATIC_WORD;
2711 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2712
2713 found_vmentry = true;
2714 break;
2715 }
2716 }
2717
2718 if (!found_vmentry)
2719 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2720 "missing vmentry byte field in java.dyn.MethodHandle");
2721
2722 }
2723
2724
2725 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2726 Handle class_loader,
2727 Handle protection_domain,
2728 KlassHandle host_klass,
2729 GrowableArray<Handle>* cp_patches,
2730 symbolHandle& parsed_name,
2731 bool verify,
2732 TRAPS) {
2733 // So that JVMTI can cache class file in the state before retransformable agents
2734 // have modified it
2735 unsigned char *cached_class_file_bytes = NULL;
2736 jint cached_class_file_length;
2737
2738 ClassFileStream* cfs = stream();
2739 // Timing
2740 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2741 JavaThread* jt = (JavaThread*) THREAD;
2742
2743 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2744 ClassLoader::perf_class_parse_selftime(),
2745 NULL,
2746 jt->get_thread_stat()->perf_recursion_counts_addr(),
2747 jt->get_thread_stat()->perf_timers_addr(),
2748 PerfClassTraceTime::PARSE_CLASS);
2749
2750 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2751
2752 if (JvmtiExport::should_post_class_file_load_hook()) {
2753 unsigned char* ptr = cfs->buffer();
2754 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2755
2756 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2757 &ptr, &end_ptr,
2758 &cached_class_file_bytes,
2759 &cached_class_file_length);
2760
2761 if (ptr != cfs->buffer()) {
2762 // JVMTI agent has modified class file data.
2763 // Set new class file stream using JVMTI agent modified
2764 // class file data.
2765 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2766 set_stream(cfs);
2767 }
2768 }
2769
2770 _host_klass = host_klass;
2771 _cp_patches = cp_patches;
2772
2773 instanceKlassHandle nullHandle;
2774
2775 // Figure out whether we can skip format checking (matching classic VM behavior)
2776 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2777
2778 // Set the verify flag in stream
2779 cfs->set_verify(_need_verify);
2780
2781 // Save the class file name for easier error message printing.
2782 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2783
2784 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2785 // Magic value
2786 u4 magic = cfs->get_u4_fast();
2787 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2788 "Incompatible magic value %u in class file %s",
2789 magic, CHECK_(nullHandle));
2790
2791 // Version numbers
2792 u2 minor_version = cfs->get_u2_fast();
2793 u2 major_version = cfs->get_u2_fast();
2794
2795 // Check version numbers - we check this even with verifier off
2796 if (!is_supported_version(major_version, minor_version)) {
2797 if (name.is_null()) {
2798 Exceptions::fthrow(
2799 THREAD_AND_LOCATION,
2800 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2801 "Unsupported major.minor version %u.%u",
2802 major_version,
2803 minor_version);
2804 } else {
2805 ResourceMark rm(THREAD);
2806 Exceptions::fthrow(
2807 THREAD_AND_LOCATION,
2808 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2809 "%s : Unsupported major.minor version %u.%u",
2810 name->as_C_string(),
2811 major_version,
2812 minor_version);
2813 }
2814 return nullHandle;
2815 }
2816
2817 _major_version = major_version;
2818 _minor_version = minor_version;
2819
2820
2821 // Check if verification needs to be relaxed for this class file
2822 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2823 _relax_verify = Verifier::relax_verify_for(class_loader());
2824
2825 // Constant pool
2826 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2827 int cp_size = cp->length();
2828
2829 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2830
2831 // Access flags
2832 AccessFlags access_flags;
2833 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2834
2835 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2836 // Set abstract bit for old class files for backward compatibility
2837 flags |= JVM_ACC_ABSTRACT;
2838 }
2839 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2840 access_flags.set_flags(flags);
2841
2842 // This class and superclass
2843 instanceKlassHandle super_klass;
2844 u2 this_class_index = cfs->get_u2_fast();
2845 check_property(
2846 valid_cp_range(this_class_index, cp_size) &&
2847 cp->tag_at(this_class_index).is_unresolved_klass(),
2848 "Invalid this class index %u in constant pool in class file %s",
2849 this_class_index, CHECK_(nullHandle));
2850
2851 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2852 assert(class_name.not_null(), "class_name can't be null");
2853
2854 // It's important to set parsed_name *before* resolving the super class.
2855 // (it's used for cleanup by the caller if parsing fails)
2856 parsed_name = class_name;
2857
2858 // Update _class_name which could be null previously to be class_name
2859 _class_name = class_name;
2860
2861 // Don't need to check whether this class name is legal or not.
2862 // It has been checked when constant pool is parsed.
2863 // However, make sure it is not an array type.
2864 if (_need_verify) {
2865 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2866 "Bad class name in class file %s",
2867 CHECK_(nullHandle));
2868 }
2869
2870 klassOop preserve_this_klass; // for storing result across HandleMark
2871
2872 // release all handles when parsing is done
2873 { HandleMark hm(THREAD);
2874
2875 // Checks if name in class file matches requested name
2876 if (name.not_null() && class_name() != name()) {
2877 ResourceMark rm(THREAD);
2878 Exceptions::fthrow(
2879 THREAD_AND_LOCATION,
2880 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2881 "%s (wrong name: %s)",
2882 name->as_C_string(),
2883 class_name->as_C_string()
2884 );
2885 return nullHandle;
2886 }
2887
2888 if (TraceClassLoadingPreorder) {
2889 tty->print("[Loading %s", name()->as_klass_external_name());
2890 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2891 tty->print_cr("]");
2892 }
2893
2894 u2 super_class_index = cfs->get_u2_fast();
2895 if (super_class_index == 0) {
2896 check_property(class_name() == vmSymbols::java_lang_Object(),
2897 "Invalid superclass index %u in class file %s",
2898 super_class_index,
2899 CHECK_(nullHandle));
2900 } else {
2901 check_property(valid_cp_range(super_class_index, cp_size) &&
2902 is_klass_reference(cp, super_class_index),
2903 "Invalid superclass index %u in class file %s",
2904 super_class_index,
2905 CHECK_(nullHandle));
2906 // The class name should be legal because it is checked when parsing constant pool.
2907 // However, make sure it is not an array type.
2908 bool is_array = false;
2909 if (cp->tag_at(super_class_index).is_klass()) {
2910 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2911 if (_need_verify)
2912 is_array = super_klass->oop_is_array();
2913 } else if (_need_verify) {
2914 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2915 }
2916 if (_need_verify) {
2917 guarantee_property(!is_array,
2918 "Bad superclass name in class file %s", CHECK_(nullHandle));
2919 }
2920 }
2921
2922 // Interfaces
2923 u2 itfs_len = cfs->get_u2_fast();
2924 objArrayHandle local_interfaces;
2925 if (itfs_len == 0) {
2926 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2927 } else {
2928 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2929 }
2930
2931 // Fields (offsets are filled in later)
2932 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2933 objArrayHandle fields_annotations;
2934 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2935 // Methods
2936 bool has_final_method = false;
2937 AccessFlags promoted_flags;
2938 promoted_flags.set_flags(0);
2939 // These need to be oop pointers because they are allocated lazily
2940 // inside parse_methods inside a nested HandleMark
2941 objArrayOop methods_annotations_oop = NULL;
2942 objArrayOop methods_parameter_annotations_oop = NULL;
2943 objArrayOop methods_default_annotations_oop = NULL;
2944 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2945 &promoted_flags,
2946 &has_final_method,
2947 &methods_annotations_oop,
2948 &methods_parameter_annotations_oop,
2949 &methods_default_annotations_oop,
2950 CHECK_(nullHandle));
2951
2952 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2953 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2954 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2955
2956 // We check super class after class file is parsed and format is checked
2957 if (super_class_index > 0 && super_klass.is_null()) {
2958 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2959 if (access_flags.is_interface()) {
2960 // Before attempting to resolve the superclass, check for class format
2961 // errors not checked yet.
2962 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2963 "Interfaces must have java.lang.Object as superclass in class file %s",
2964 CHECK_(nullHandle));
2965 }
2966 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2967 sk,
2968 class_loader,
2969 protection_domain,
2970 true,
2971 CHECK_(nullHandle));
2972
2973 KlassHandle kh (THREAD, k);
2974 super_klass = instanceKlassHandle(THREAD, kh());
2975 if (LinkWellKnownClasses) // my super class is well known to me
2976 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2977 }
2978 if (super_klass.not_null()) {
2979 if (super_klass->is_interface()) {
2980 ResourceMark rm(THREAD);
2981 Exceptions::fthrow(
2982 THREAD_AND_LOCATION,
2983 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2984 "class %s has interface %s as super class",
2985 class_name->as_klass_external_name(),
2986 super_klass->external_name()
2987 );
2988 return nullHandle;
2989 }
2990 // Make sure super class is not final
2991 if (super_klass->is_final()) {
2992 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2993 }
2994 }
2995
2996 // Compute the transitive list of all unique interfaces implemented by this class
2997 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2998
2999 // sort methods
3000 typeArrayHandle method_ordering = sort_methods(methods,
3001 methods_annotations,
3002 methods_parameter_annotations,
3003 methods_default_annotations,
3004 CHECK_(nullHandle));
3005
3006 // promote flags from parse_methods() to the klass' flags
3007 access_flags.add_promoted_flags(promoted_flags.as_int());
3008
3009 // Size of Java vtable (in words)
3010 int vtable_size = 0;
3011 int itable_size = 0;
3012 int num_miranda_methods = 0;
3013
3014 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3015 num_miranda_methods,
3016 super_klass(),
3017 methods(),
3018 access_flags,
3019 class_loader,
3020 class_name,
3021 local_interfaces(),
3022 CHECK_(nullHandle));
3023
3024 // Size of Java itable (in words)
3025 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3026
3027 // Field size and offset computation
3028 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3029 #ifndef PRODUCT
3030 int orig_nonstatic_field_size = 0;
3031 #endif
3032 int static_field_size = 0;
3033 int next_static_oop_offset;
3034 int next_static_double_offset;
3035 int next_static_word_offset;
3036 int next_static_short_offset;
3037 int next_static_byte_offset;
3038 int next_static_type_offset;
3039 int next_nonstatic_oop_offset;
3040 int next_nonstatic_double_offset;
3041 int next_nonstatic_word_offset;
3042 int next_nonstatic_short_offset;
3043 int next_nonstatic_byte_offset;
3044 int next_nonstatic_type_offset;
3045 int first_nonstatic_oop_offset;
3046 int first_nonstatic_field_offset;
3047 int next_nonstatic_field_offset;
3048
3049 // Calculate the starting byte offsets
3050 next_static_oop_offset = (instanceKlass::header_size() +
3051 align_object_offset(vtable_size) +
3052 align_object_offset(itable_size)) * wordSize;
3053 next_static_double_offset = next_static_oop_offset +
3054 (fac.static_oop_count * heapOopSize);
3055 if ( fac.static_double_count &&
3056 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3057 Universe::field_type_should_be_aligned(T_LONG)) ) {
3058 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3059 }
3060
3061 next_static_word_offset = next_static_double_offset +
3062 (fac.static_double_count * BytesPerLong);
3063 next_static_short_offset = next_static_word_offset +
3064 (fac.static_word_count * BytesPerInt);
3065 next_static_byte_offset = next_static_short_offset +
3066 (fac.static_short_count * BytesPerShort);
3067 next_static_type_offset = align_size_up((next_static_byte_offset +
3068 fac.static_byte_count ), wordSize );
3069 static_field_size = (next_static_type_offset -
3070 next_static_oop_offset) / wordSize;
3071 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3072 nonstatic_field_size * heapOopSize;
3073 next_nonstatic_field_offset = first_nonstatic_field_offset;
3074
3075 // Add fake fields for java.lang.Class instances (also see below)
3076 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3077 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3078 }
3079
3080 // adjust the vmentry field declaration in java.dyn.MethodHandle
3081 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3082 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
3083 }
3084
3085 // Add a fake "discovered" field if it is not present
3086 // for compatibility with earlier jdk's.
3087 if (class_name() == vmSymbols::java_lang_ref_Reference()
3088 && class_loader.is_null()) {
3089 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3090 }
3091 // end of "discovered" field compactibility fix
3092
3093 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3094 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3095 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3096 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3097 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3098
3099 bool super_has_nonstatic_fields =
3100 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3101 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3102 ((nonstatic_double_count + nonstatic_word_count +
3103 nonstatic_short_count + nonstatic_byte_count +
3104 nonstatic_oop_count) != 0);
3105
3106
3107 // Prepare list of oops for oop map generation.
3108 int* nonstatic_oop_offsets;
3109 unsigned int* nonstatic_oop_counts;
3110 unsigned int nonstatic_oop_map_count = 0;
3111
3112 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3113 THREAD, int, nonstatic_oop_count + 1);
3114 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3115 THREAD, unsigned int, nonstatic_oop_count + 1);
3116
3117 // Add fake fields for java.lang.Class instances (also see above).
3118 // FieldsAllocationStyle and CompactFields values will be reset to default.
3119 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3120 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3121 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3122 const uint fake_oop_count = (next_nonstatic_field_offset -
3123 first_nonstatic_field_offset) / heapOopSize;
3124 nonstatic_oop_counts[0] = fake_oop_count;
3125 nonstatic_oop_map_count = 1;
3126 nonstatic_oop_count -= fake_oop_count;
3127 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3128 } else {
3129 first_nonstatic_oop_offset = 0; // will be set for first oop field
3130 }
3131
3132 #ifndef PRODUCT
3133 if( PrintCompactFieldsSavings ) {
3134 next_nonstatic_double_offset = next_nonstatic_field_offset +
3135 (nonstatic_oop_count * heapOopSize);
3136 if ( nonstatic_double_count > 0 ) {
3137 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3138 }
3139 next_nonstatic_word_offset = next_nonstatic_double_offset +
3140 (nonstatic_double_count * BytesPerLong);
3141 next_nonstatic_short_offset = next_nonstatic_word_offset +
3142 (nonstatic_word_count * BytesPerInt);
3143 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3144 (nonstatic_short_count * BytesPerShort);
3145 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3146 nonstatic_byte_count ), heapOopSize );
3147 orig_nonstatic_field_size = nonstatic_field_size +
3148 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3149 }
3150 #endif
3151 bool compact_fields = CompactFields;
3152 int allocation_style = FieldsAllocationStyle;
3153 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3154 assert(false, "0 <= FieldsAllocationStyle <= 2");
3155 allocation_style = 1; // Optimistic
3156 }
3157
3158 // The next classes have predefined hard-coded fields offsets
3159 // (see in JavaClasses::compute_hard_coded_offsets()).
3160 // Use default fields allocation order for them.
3161 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3162 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
3163 class_name() == vmSymbols::java_lang_Class() ||
3164 class_name() == vmSymbols::java_lang_ClassLoader() ||
3165 class_name() == vmSymbols::java_lang_ref_Reference() ||
3166 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
3167 class_name() == vmSymbols::java_lang_StackTraceElement() ||
3168 class_name() == vmSymbols::java_lang_String() ||
3169 class_name() == vmSymbols::java_lang_Throwable() ||
3170 class_name() == vmSymbols::java_lang_Boolean() ||
3171 class_name() == vmSymbols::java_lang_Character() ||
3172 class_name() == vmSymbols::java_lang_Float() ||
3173 class_name() == vmSymbols::java_lang_Double() ||
3174 class_name() == vmSymbols::java_lang_Byte() ||
3175 class_name() == vmSymbols::java_lang_Short() ||
3176 class_name() == vmSymbols::java_lang_Integer() ||
3177 class_name() == vmSymbols::java_lang_Long())) {
3178 allocation_style = 0; // Allocate oops first
3179 compact_fields = false; // Don't compact fields
3180 }
3181
3182 if( allocation_style == 0 ) {
3183 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3184 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3185 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3186 (nonstatic_oop_count * heapOopSize);
3187 } else if( allocation_style == 1 ) {
3188 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3189 next_nonstatic_double_offset = next_nonstatic_field_offset;
3190 } else if( allocation_style == 2 ) {
3191 // Fields allocation: oops fields in super and sub classes are together.
3192 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3193 super_klass->nonstatic_oop_map_size() > 0 ) {
3194 int map_size = super_klass->nonstatic_oop_map_size();
3195 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3196 OopMapBlock* last_map = first_map + map_size - 1;
3197 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3198 if (next_offset == next_nonstatic_field_offset) {
3199 allocation_style = 0; // allocate oops first
3200 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3201 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3202 (nonstatic_oop_count * heapOopSize);
3203 }
3204 }
3205 if( allocation_style == 2 ) {
3206 allocation_style = 1; // allocate oops last
3207 next_nonstatic_double_offset = next_nonstatic_field_offset;
3208 }
3209 } else {
3210 ShouldNotReachHere();
3211 }
3212
3213 int nonstatic_oop_space_count = 0;
3214 int nonstatic_word_space_count = 0;
3215 int nonstatic_short_space_count = 0;
3216 int nonstatic_byte_space_count = 0;
3217 int nonstatic_oop_space_offset;
3218 int nonstatic_word_space_offset;
3219 int nonstatic_short_space_offset;
3220 int nonstatic_byte_space_offset;
3221
3222 if( nonstatic_double_count > 0 ) {
3223 int offset = next_nonstatic_double_offset;
3224 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3225 if( compact_fields && offset != next_nonstatic_double_offset ) {
3226 // Allocate available fields into the gap before double field.
3227 int length = next_nonstatic_double_offset - offset;
3228 assert(length == BytesPerInt, "");
3229 nonstatic_word_space_offset = offset;
3230 if( nonstatic_word_count > 0 ) {
3231 nonstatic_word_count -= 1;
3232 nonstatic_word_space_count = 1; // Only one will fit
3233 length -= BytesPerInt;
3234 offset += BytesPerInt;
3235 }
3236 nonstatic_short_space_offset = offset;
3237 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3238 nonstatic_short_count -= 1;
3239 nonstatic_short_space_count += 1;
3240 length -= BytesPerShort;
3241 offset += BytesPerShort;
3242 }
3243 nonstatic_byte_space_offset = offset;
3244 while( length > 0 && nonstatic_byte_count > 0 ) {
3245 nonstatic_byte_count -= 1;
3246 nonstatic_byte_space_count += 1;
3247 length -= 1;
3248 }
3249 // Allocate oop field in the gap if there are no other fields for that.
3250 nonstatic_oop_space_offset = offset;
3251 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3252 allocation_style != 0 ) { // when oop fields not first
3253 nonstatic_oop_count -= 1;
3254 nonstatic_oop_space_count = 1; // Only one will fit
3255 length -= heapOopSize;
3256 offset += heapOopSize;
3257 }
3258 }
3259 }
3260
3261 next_nonstatic_word_offset = next_nonstatic_double_offset +
3262 (nonstatic_double_count * BytesPerLong);
3263 next_nonstatic_short_offset = next_nonstatic_word_offset +
3264 (nonstatic_word_count * BytesPerInt);
3265 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3266 (nonstatic_short_count * BytesPerShort);
3267
3268 int notaligned_offset;
3269 if( allocation_style == 0 ) {
3270 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3271 } else { // allocation_style == 1
3272 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3273 if( nonstatic_oop_count > 0 ) {
3274 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3275 }
3276 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3277 }
3278 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3279 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3280 - first_nonstatic_field_offset)/heapOopSize);
3281
3282 // Iterate over fields again and compute correct offsets.
3283 // The field allocation type was temporarily stored in the offset slot.
3284 // oop fields are located before non-oop fields (static and non-static).
3285 int len = fields->length();
3286 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3287 int real_offset;
3288 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3289 switch (atype) {
3290 case STATIC_OOP:
3291 real_offset = next_static_oop_offset;
3292 next_static_oop_offset += heapOopSize;
3293 break;
3294 case STATIC_BYTE:
3295 real_offset = next_static_byte_offset;
3296 next_static_byte_offset += 1;
3297 break;
3298 case STATIC_SHORT:
3299 real_offset = next_static_short_offset;
3300 next_static_short_offset += BytesPerShort;
3301 break;
3302 case STATIC_WORD:
3303 real_offset = next_static_word_offset;
3304 next_static_word_offset += BytesPerInt;
3305 break;
3306 case STATIC_ALIGNED_DOUBLE:
3307 case STATIC_DOUBLE:
3308 real_offset = next_static_double_offset;
3309 next_static_double_offset += BytesPerLong;
3310 break;
3311 case NONSTATIC_OOP:
3312 if( nonstatic_oop_space_count > 0 ) {
3313 real_offset = nonstatic_oop_space_offset;
3314 nonstatic_oop_space_offset += heapOopSize;
3315 nonstatic_oop_space_count -= 1;
3316 } else {
3317 real_offset = next_nonstatic_oop_offset;
3318 next_nonstatic_oop_offset += heapOopSize;
3319 }
3320 // Update oop maps
3321 if( nonstatic_oop_map_count > 0 &&
3322 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3323 real_offset -
3324 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3325 heapOopSize ) {
3326 // Extend current oop map
3327 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3328 } else {
3329 // Create new oop map
3330 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3331 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3332 nonstatic_oop_map_count += 1;
3333 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3334 first_nonstatic_oop_offset = real_offset;
3335 }
3336 }
3337 break;
3338 case NONSTATIC_BYTE:
3339 if( nonstatic_byte_space_count > 0 ) {
3340 real_offset = nonstatic_byte_space_offset;
3341 nonstatic_byte_space_offset += 1;
3342 nonstatic_byte_space_count -= 1;
3343 } else {
3344 real_offset = next_nonstatic_byte_offset;
3345 next_nonstatic_byte_offset += 1;
3346 }
3347 break;
3348 case NONSTATIC_SHORT:
3349 if( nonstatic_short_space_count > 0 ) {
3350 real_offset = nonstatic_short_space_offset;
3351 nonstatic_short_space_offset += BytesPerShort;
3352 nonstatic_short_space_count -= 1;
3353 } else {
3354 real_offset = next_nonstatic_short_offset;
3355 next_nonstatic_short_offset += BytesPerShort;
3356 }
3357 break;
3358 case NONSTATIC_WORD:
3359 if( nonstatic_word_space_count > 0 ) {
3360 real_offset = nonstatic_word_space_offset;
3361 nonstatic_word_space_offset += BytesPerInt;
3362 nonstatic_word_space_count -= 1;
3363 } else {
3364 real_offset = next_nonstatic_word_offset;
3365 next_nonstatic_word_offset += BytesPerInt;
3366 }
3367 break;
3368 case NONSTATIC_ALIGNED_DOUBLE:
3369 case NONSTATIC_DOUBLE:
3370 real_offset = next_nonstatic_double_offset;
3371 next_nonstatic_double_offset += BytesPerLong;
3372 break;
3373 default:
3374 ShouldNotReachHere();
3375 }
3376 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3377 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3378 }
3379
3380 // Size of instances
3381 int instance_size;
3382
3383 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3384 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3385
3386 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3387
3388 // Number of non-static oop map blocks allocated at end of klass.
3389 const unsigned int total_oop_map_count =
3390 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3391 first_nonstatic_oop_offset);
3392
3393 // Compute reference type
3394 ReferenceType rt;
3395 if (super_klass() == NULL) {
3396 rt = REF_NONE;
3397 } else {
3398 rt = super_klass->reference_type();
3399 }
3400
3401 // We can now create the basic klassOop for this klass
3402 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3403 static_field_size,
3404 total_oop_map_count,
3405 rt, CHECK_(nullHandle));
3406 instanceKlassHandle this_klass (THREAD, ik);
3407
3408 assert(this_klass->static_field_size() == static_field_size, "sanity");
3409 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3410 "sanity");
3411
3412 // Fill in information already parsed
3413 this_klass->set_access_flags(access_flags);
3414 this_klass->set_should_verify_class(verify);
3415 jint lh = Klass::instance_layout_helper(instance_size, false);
3416 this_klass->set_layout_helper(lh);
3417 assert(this_klass->oop_is_instance(), "layout is correct");
3418 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3419 // Not yet: supers are done below to support the new subtype-checking fields
3420 //this_klass->set_super(super_klass());
3421 this_klass->set_class_loader(class_loader());
3422 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3423 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3424 this_klass->set_static_oop_field_size(fac.static_oop_count);
3425 cp->set_pool_holder(this_klass());
3426 this_klass->set_constants(cp());
3427 this_klass->set_local_interfaces(local_interfaces());
3428 this_klass->set_fields(fields());
3429 this_klass->set_methods(methods());
3430 if (has_final_method) {
3431 this_klass->set_has_final_method();
3432 }
3433 this_klass->set_method_ordering(method_ordering());
3434 // The instanceKlass::_methods_jmethod_ids cache and the
3435 // instanceKlass::_methods_cached_itable_indices cache are
3436 // both managed on the assumption that the initial cache
3437 // size is equal to the number of methods in the class. If
3438 // that changes, then instanceKlass::idnum_can_increment()
3439 // has to be changed accordingly.
3440 this_klass->set_initial_method_idnum(methods->length());
3441 this_klass->set_name(cp->klass_name_at(this_class_index));
3442 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3443 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3444 this_klass->set_protection_domain(protection_domain());
3445 this_klass->set_fields_annotations(fields_annotations());
3446 this_klass->set_methods_annotations(methods_annotations());
3447 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3448 this_klass->set_methods_default_annotations(methods_default_annotations());
3449
3450 this_klass->set_minor_version(minor_version);
3451 this_klass->set_major_version(major_version);
3452
3453 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3454 // (We used to do this lazily, but now we query it in Rewriter,
3455 // which is eagerly done for every method, so we might as well do it now,
3456 // when everything is fresh in memory.)
3457 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3458 for (int j = 0; j < methods->length(); j++) {
3459 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3460 }
3461 }
3462
3463 if (cached_class_file_bytes != NULL) {
3464 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3465 this_klass->set_cached_class_file(cached_class_file_bytes,
3466 cached_class_file_length);
3467 }
3468
3469 // Miranda methods
3470 if ((num_miranda_methods > 0) ||
3471 // if this class introduced new miranda methods or
3472 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3473 // super class exists and this class inherited miranda methods
3474 ) {
3475 this_klass->set_has_miranda_methods(); // then set a flag
3476 }
3477
3478 // Additional attributes
3479 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3480
3481 // Make sure this is the end of class file stream
3482 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3483
3484 // Initialize static fields
3485 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3486
3487 // VerifyOops believes that once this has been set, the object is completely loaded.
3488 // Compute transitive closure of interfaces this class implements
3489 this_klass->set_transitive_interfaces(transitive_interfaces());
3490
3491 // Fill in information needed to compute superclasses.
3492 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3493
3494 // Initialize itable offset tables
3495 klassItable::setup_itable_offset_table(this_klass);
3496
3497 // Do final class setup
3498 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3499
3500 set_precomputed_flags(this_klass);
3501
3502 // reinitialize modifiers, using the InnerClasses attribute
3503 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3504 this_klass->set_modifier_flags(computed_modifiers);
3505
3506 // check if this class can access its super class
3507 check_super_class_access(this_klass, CHECK_(nullHandle));
3508
3509 // check if this class can access its superinterfaces
3510 check_super_interface_access(this_klass, CHECK_(nullHandle));
3511
3512 // check if this class overrides any final method
3513 check_final_method_override(this_klass, CHECK_(nullHandle));
3514
3515 // check that if this class is an interface then it doesn't have static methods
3516 if (this_klass->is_interface()) {
3517 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3518 }
3519
3520 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3521 false /* not shared class */);
3522
3523 if (TraceClassLoading) {
3524 // print in a single call to reduce interleaving of output
3525 if (cfs->source() != NULL) {
3526 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3527 cfs->source());
3528 } else if (class_loader.is_null()) {
3529 if (THREAD->is_Java_thread()) {
3530 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3531 tty->print("[Loaded %s by instance of %s]\n",
3532 this_klass->external_name(),
3533 instanceKlass::cast(caller)->external_name());
3534 } else {
3535 tty->print("[Loaded %s]\n", this_klass->external_name());
3536 }
3537 } else {
3538 ResourceMark rm;
3539 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3540 instanceKlass::cast(class_loader->klass())->external_name());
3541 }
3542 }
3543
3544 if (TraceClassResolution) {
3545 // print out the superclass.
3546 const char * from = Klass::cast(this_klass())->external_name();
3547 if (this_klass->java_super() != NULL) {
3548 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3549 }
3550 // print out each of the interface classes referred to by this class.
3551 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3552 if (!local_interfaces.is_null()) {
3553 int length = local_interfaces->length();
3554 for (int i = 0; i < length; i++) {
3555 klassOop k = klassOop(local_interfaces->obj_at(i));
3556 instanceKlass* to_class = instanceKlass::cast(k);
3557 const char * to = to_class->external_name();
3558 tty->print("RESOLVE %s %s (interface)\n", from, to);
3559 }
3560 }
3561 }
3562
3563 #ifndef PRODUCT
3564 if( PrintCompactFieldsSavings ) {
3565 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3566 tty->print("[Saved %d of %d bytes in %s]\n",
3567 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3568 orig_nonstatic_field_size*heapOopSize,
3569 this_klass->external_name());
3570 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3571 tty->print("[Wasted %d over %d bytes in %s]\n",
3572 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3573 orig_nonstatic_field_size*heapOopSize,
3574 this_klass->external_name());
3575 }
3576 }
3577 #endif
3578
3579 // preserve result across HandleMark
3580 preserve_this_klass = this_klass();
3581 }
3582
3583 // Create new handle outside HandleMark
3584 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3585 debug_only(this_klass->as_klassOop()->verify();)
3586
3587 return this_klass;
3588 }
3589
3590
3591 unsigned int
3592 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3593 unsigned int nonstatic_oop_map_count,
3594 int first_nonstatic_oop_offset) {
3595 unsigned int map_count =
3596 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3597 if (nonstatic_oop_map_count > 0) {
3598 // We have oops to add to map
3599 if (map_count == 0) {
3600 map_count = nonstatic_oop_map_count;
3601 } else {
3602 // Check whether we should add a new map block or whether the last one can
3603 // be extended
3604 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3605 OopMapBlock* const last_map = first_map + map_count - 1;
3606
3607 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3608 if (next_offset == first_nonstatic_oop_offset) {
3609 // There is no gap bettwen superklass's last oop field and first
3610 // local oop field, merge maps.
3611 nonstatic_oop_map_count -= 1;
3612 } else {
3613 // Superklass didn't end with a oop field, add extra maps
3614 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3615 }
3616 map_count += nonstatic_oop_map_count;
3617 }
3618 }
3619 return map_count;
3620 }
3621
3622
3623 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3624 unsigned int nonstatic_oop_map_count,
3625 int* nonstatic_oop_offsets,
3626 unsigned int* nonstatic_oop_counts) {
3627 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3628 const instanceKlass* const super = k->superklass();
3629 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3630 if (super_count > 0) {
3631 // Copy maps from superklass
3632 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3633 for (unsigned int i = 0; i < super_count; ++i) {
3634 *this_oop_map++ = *super_oop_map++;
3635 }
3636 }
3637
3638 if (nonstatic_oop_map_count > 0) {
3639 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3640 // The counts differ because there is no gap between superklass's last oop
3641 // field and the first local oop field. Extend the last oop map copied
3642 // from the superklass instead of creating new one.
3643 nonstatic_oop_map_count--;
3644 nonstatic_oop_offsets++;
3645 this_oop_map--;
3646 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3647 this_oop_map++;
3648 }
3649
3650 // Add new map blocks, fill them
3651 while (nonstatic_oop_map_count-- > 0) {
3652 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3653 this_oop_map->set_count(*nonstatic_oop_counts++);
3654 this_oop_map++;
3655 }
3656 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3657 this_oop_map, "sanity");
3658 }
3659 }
3660
3661
3662 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3663 klassOop super = k->super();
3664
3665 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3666 // in which case we don't have to register objects as finalizable
3667 if (!_has_empty_finalizer) {
3668 if (_has_finalizer ||
3669 (super != NULL && super->klass_part()->has_finalizer())) {
3670 k->set_has_finalizer();
3671 }
3672 }
3673
3674 #ifdef ASSERT
3675 bool f = false;
3676 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3677 vmSymbols::void_method_signature());
3678 if (m != NULL && !m->is_empty_method()) {
3679 f = true;
3680 }
3681 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3682 #endif
3683
3684 // Check if this klass supports the java.lang.Cloneable interface
3685 if (SystemDictionary::Cloneable_klass_loaded()) {
3686 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3687 k->set_is_cloneable();
3688 }
3689 }
3690
3691 // Check if this klass has a vanilla default constructor
3692 if (super == NULL) {
3693 // java.lang.Object has empty default constructor
3694 k->set_has_vanilla_constructor();
3695 } else {
3696 if (Klass::cast(super)->has_vanilla_constructor() &&
3697 _has_vanilla_constructor) {
3698 k->set_has_vanilla_constructor();
3699 }
3700 #ifdef ASSERT
3701 bool v = false;
3702 if (Klass::cast(super)->has_vanilla_constructor()) {
3703 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3704 ), vmSymbols::void_method_signature());
3705 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3706 v = true;
3707 }
3708 }
3709 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3710 #endif
3711 }
3712
3713 // If it cannot be fast-path allocated, set a bit in the layout helper.
3714 // See documentation of instanceKlass::can_be_fastpath_allocated().
3715 assert(k->size_helper() > 0, "layout_helper is initialized");
3716 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3717 || k->is_abstract() || k->is_interface()
3718 || (k->name() == vmSymbols::java_lang_Class()
3719 && k->class_loader() == NULL)
3720 || k->size_helper() >= FastAllocateSizeLimit) {
3721 // Forbid fast-path allocation.
3722 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3723 k->set_layout_helper(lh);
3724 }
3725 }
3726
3727
3728 // utility method for appending and array with check for duplicates
3729
3730 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3731 // iterate over new interfaces
3732 for (int i = 0; i < ifs->length(); i++) {
3733 oop e = ifs->obj_at(i);
3734 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3735 // check for duplicates
3736 bool duplicate = false;
3737 for (int j = 0; j < index; j++) {
3738 if (result->obj_at(j) == e) {
3739 duplicate = true;
3740 break;
3741 }
3742 }
3743 // add new interface
3744 if (!duplicate) {
3745 result->obj_at_put(index++, e);
3746 }
3747 }
3748 }
3749
3750 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3751 // Compute maximum size for transitive interfaces
3752 int max_transitive_size = 0;
3753 int super_size = 0;
3754 // Add superclass transitive interfaces size
3755 if (super.not_null()) {
3756 super_size = super->transitive_interfaces()->length();
3757 max_transitive_size += super_size;
3758 }
3759 // Add local interfaces' super interfaces
3760 int local_size = local_ifs->length();
3761 for (int i = 0; i < local_size; i++) {
3762 klassOop l = klassOop(local_ifs->obj_at(i));
3763 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3764 }
3765 // Finally add local interfaces
3766 max_transitive_size += local_size;
3767 // Construct array
3768 objArrayHandle result;
3769 if (max_transitive_size == 0) {
3770 // no interfaces, use canonicalized array
3771 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3772 } else if (max_transitive_size == super_size) {
3773 // no new local interfaces added, share superklass' transitive interface array
3774 result = objArrayHandle(THREAD, super->transitive_interfaces());
3775 } else if (max_transitive_size == local_size) {
3776 // only local interfaces added, share local interface array
3777 result = local_ifs;
3778 } else {
3779 objArrayHandle nullHandle;
3780 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3781 result = objArrayHandle(THREAD, new_objarray);
3782 int index = 0;
3783 // Copy down from superclass
3784 if (super.not_null()) {
3785 append_interfaces(result, index, super->transitive_interfaces());
3786 }
3787 // Copy down from local interfaces' superinterfaces
3788 for (int i = 0; i < local_ifs->length(); i++) {
3789 klassOop l = klassOop(local_ifs->obj_at(i));
3790 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3791 }
3792 // Finally add local interfaces
3793 append_interfaces(result, index, local_ifs());
3794
3795 // Check if duplicates were removed
3796 if (index != max_transitive_size) {
3797 assert(index < max_transitive_size, "just checking");
3798 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3799 for (int i = 0; i < index; i++) {
3800 oop e = result->obj_at(i);
3801 assert(e != NULL, "just checking");
3802 new_result->obj_at_put(i, e);
3803 }
3804 result = objArrayHandle(THREAD, new_result);
3805 }
3806 }
3807 return result;
3808 }
3809
3810
3811 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3812 klassOop super = this_klass->super();
3813 if ((super != NULL) &&
3814 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3815 ResourceMark rm(THREAD);
3816 Exceptions::fthrow(
3817 THREAD_AND_LOCATION,
3818 vmSymbolHandles::java_lang_IllegalAccessError(),
3819 "class %s cannot access its superclass %s",
3820 this_klass->external_name(),
3821 instanceKlass::cast(super)->external_name()
3822 );
3823 return;
3824 }
3825 }
3826
3827
3828 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3829 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3830 int lng = local_interfaces->length();
3831 for (int i = lng - 1; i >= 0; i--) {
3832 klassOop k = klassOop(local_interfaces->obj_at(i));
3833 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3834 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3835 ResourceMark rm(THREAD);
3836 Exceptions::fthrow(
3837 THREAD_AND_LOCATION,
3838 vmSymbolHandles::java_lang_IllegalAccessError(),
3839 "class %s cannot access its superinterface %s",
3840 this_klass->external_name(),
3841 instanceKlass::cast(k)->external_name()
3842 );
3843 return;
3844 }
3845 }
3846 }
3847
3848
3849 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3850 objArrayHandle methods (THREAD, this_klass->methods());
3851 int num_methods = methods->length();
3852
3853 // go thru each method and check if it overrides a final method
3854 for (int index = 0; index < num_methods; index++) {
3855 methodOop m = (methodOop)methods->obj_at(index);
3856
3857 // skip private, static and <init> methods
3858 if ((!m->is_private()) &&
3859 (!m->is_static()) &&
3860 (m->name() != vmSymbols::object_initializer_name())) {
3861
3862 symbolOop name = m->name();
3863 symbolOop signature = m->signature();
3864 klassOop k = this_klass->super();
3865 methodOop super_m = NULL;
3866 while (k != NULL) {
3867 // skip supers that don't have final methods.
3868 if (k->klass_part()->has_final_method()) {
3869 // lookup a matching method in the super class hierarchy
3870 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3871 if (super_m == NULL) {
3872 break; // didn't find any match; get out
3873 }
3874
3875 if (super_m->is_final() &&
3876 // matching method in super is final
3877 (Reflection::verify_field_access(this_klass->as_klassOop(),
3878 super_m->method_holder(),
3879 super_m->method_holder(),
3880 super_m->access_flags(), false))
3881 // this class can access super final method and therefore override
3882 ) {
3883 ResourceMark rm(THREAD);
3884 Exceptions::fthrow(
3885 THREAD_AND_LOCATION,
3886 vmSymbolHandles::java_lang_VerifyError(),
3887 "class %s overrides final method %s.%s",
3888 this_klass->external_name(),
3889 name->as_C_string(),
3890 signature->as_C_string()
3891 );
3892 return;
3893 }
3894
3895 // continue to look from super_m's holder's super.
3896 k = instanceKlass::cast(super_m->method_holder())->super();
3897 continue;
3898 }
3899
3900 k = k->klass_part()->super();
3901 }
3902 }
3903 }
3904 }
3905
3906
3907 // assumes that this_klass is an interface
3908 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3909 assert(this_klass->is_interface(), "not an interface");
3910 objArrayHandle methods (THREAD, this_klass->methods());
3911 int num_methods = methods->length();
3912
3913 for (int index = 0; index < num_methods; index++) {
3914 methodOop m = (methodOop)methods->obj_at(index);
3915 // if m is static and not the init method, throw a verify error
3916 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3917 ResourceMark rm(THREAD);
3918 Exceptions::fthrow(
3919 THREAD_AND_LOCATION,
3920 vmSymbolHandles::java_lang_VerifyError(),
3921 "Illegal static method %s in interface %s",
3922 m->name()->as_C_string(),
3923 this_klass->external_name()
3924 );
3925 return;
3926 }
3927 }
3928 }
3929
3930 // utility methods for format checking
3931
3932 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3933 if (!_need_verify) { return; }
3934
3935 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3936 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3937 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3938 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3939 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3940 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3941 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3942
3943 if ((is_abstract && is_final) ||
3944 (is_interface && !is_abstract) ||
3945 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3946 (!is_interface && major_gte_15 && is_annotation)) {
3947 ResourceMark rm(THREAD);
3948 Exceptions::fthrow(
3949 THREAD_AND_LOCATION,
3950 vmSymbolHandles::java_lang_ClassFormatError(),
3951 "Illegal class modifiers in class %s: 0x%X",
3952 _class_name->as_C_string(), flags
3953 );
3954 return;
3955 }
3956 }
3957
3958 bool ClassFileParser::has_illegal_visibility(jint flags) {
3959 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3960 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3961 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3962
3963 return ((is_public && is_protected) ||
3964 (is_public && is_private) ||
3965 (is_protected && is_private));
3966 }
3967
3968 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3969 u2 max_version =
3970 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3971 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3972 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3973 (major <= max_version) &&
3974 ((major != max_version) ||
3975 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3976 }
3977
3978 void ClassFileParser::verify_legal_field_modifiers(
3979 jint flags, bool is_interface, TRAPS) {
3980 if (!_need_verify) { return; }
3981
3982 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3983 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3984 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3985 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3986 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3987 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3988 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3989 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3990 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3991
3992 bool is_illegal = false;
3993
3994 if (is_interface) {
3995 if (!is_public || !is_static || !is_final || is_private ||
3996 is_protected || is_volatile || is_transient ||
3997 (major_gte_15 && is_enum)) {
3998 is_illegal = true;
3999 }
4000 } else { // not interface
4001 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4002 is_illegal = true;
4003 }
4004 }
4005
4006 if (is_illegal) {
4007 ResourceMark rm(THREAD);
4008 Exceptions::fthrow(
4009 THREAD_AND_LOCATION,
4010 vmSymbolHandles::java_lang_ClassFormatError(),
4011 "Illegal field modifiers in class %s: 0x%X",
4012 _class_name->as_C_string(), flags);
4013 return;
4014 }
4015 }
4016
4017 void ClassFileParser::verify_legal_method_modifiers(
4018 jint flags, bool is_interface, symbolHandle name, TRAPS) {
4019 if (!_need_verify) { return; }
4020
4021 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4022 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4023 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4024 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4025 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4026 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4027 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4028 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4029 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4030 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4031 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4032
4033 bool is_illegal = false;
4034
4035 if (is_interface) {
4036 if (!is_abstract || !is_public || is_static || is_final ||
4037 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4038 is_illegal = true;
4039 }
4040 } else { // not interface
4041 if (is_initializer) {
4042 if (is_static || is_final || is_synchronized || is_native ||
4043 is_abstract || (major_gte_15 && is_bridge)) {
4044 is_illegal = true;
4045 }
4046 } else { // not initializer
4047 if (is_abstract) {
4048 if ((is_final || is_native || is_private || is_static ||
4049 (major_gte_15 && (is_synchronized || is_strict)))) {
4050 is_illegal = true;
4051 }
4052 }
4053 if (has_illegal_visibility(flags)) {
4054 is_illegal = true;
4055 }
4056 }
4057 }
4058
4059 if (is_illegal) {
4060 ResourceMark rm(THREAD);
4061 Exceptions::fthrow(
4062 THREAD_AND_LOCATION,
4063 vmSymbolHandles::java_lang_ClassFormatError(),
4064 "Method %s in class %s has illegal modifiers: 0x%X",
4065 name->as_C_string(), _class_name->as_C_string(), flags);
4066 return;
4067 }
4068 }
4069
4070 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4071 assert(_need_verify, "only called when _need_verify is true");
4072 int i = 0;
4073 int count = length >> 2;
4074 for (int k=0; k<count; k++) {
4075 unsigned char b0 = buffer[i];
4076 unsigned char b1 = buffer[i+1];
4077 unsigned char b2 = buffer[i+2];
4078 unsigned char b3 = buffer[i+3];
4079 // For an unsigned char v,
4080 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4081 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4082 unsigned char res = b0 | b0 - 1 |
4083 b1 | b1 - 1 |
4084 b2 | b2 - 1 |
4085 b3 | b3 - 1;
4086 if (res >= 128) break;
4087 i += 4;
4088 }
4089 for(; i < length; i++) {
4090 unsigned short c;
4091 // no embedded zeros
4092 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4093 if(buffer[i] < 128) {
4094 continue;
4095 }
4096 if ((i + 5) < length) { // see if it's legal supplementary character
4097 if (UTF8::is_supplementary_character(&buffer[i])) {
4098 c = UTF8::get_supplementary_character(&buffer[i]);
4099 i += 5;
4100 continue;
4101 }
4102 }
4103 switch (buffer[i] >> 4) {
4104 default: break;
4105 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4106 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4107 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4108 c = (buffer[i] & 0x1F) << 6;
4109 i++;
4110 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4111 c += buffer[i] & 0x3F;
4112 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4113 // for classes with major > 47, c must a null or a character in its shortest form
4114 break;
4115 }
4116 }
4117 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4118 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4119 c = (buffer[i] & 0xF) << 12;
4120 i += 2;
4121 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4122 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4123 if (_major_version <= 47 || c >= 0x800) {
4124 // for classes with major > 47, c must be in its shortest form
4125 break;
4126 }
4127 }
4128 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4129 } // end of switch
4130 } // end of for
4131 }
4132
4133 // Checks if name is a legal class name.
4134 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
4135 if (!_need_verify || _relax_verify) { return; }
4136
4137 char buf[fixed_buffer_size];
4138 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4139 unsigned int length = name->utf8_length();
4140 bool legal = false;
4141
4142 if (length > 0) {
4143 char* p;
4144 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4145 p = skip_over_field_signature(bytes, false, length, CHECK);
4146 legal = (p != NULL) && ((p - bytes) == (int)length);
4147 } else if (_major_version < JAVA_1_5_VERSION) {
4148 if (bytes[0] != '<') {
4149 p = skip_over_field_name(bytes, true, length);
4150 legal = (p != NULL) && ((p - bytes) == (int)length);
4151 }
4152 } else {
4153 // 4900761: relax the constraints based on JSR202 spec
4154 // Class names may be drawn from the entire Unicode character set.
4155 // Identifiers between '/' must be unqualified names.
4156 // The utf8 string has been verified when parsing cpool entries.
4157 legal = verify_unqualified_name(bytes, length, LegalClass);
4158 }
4159 }
4160 if (!legal) {
4161 ResourceMark rm(THREAD);
4162 Exceptions::fthrow(
4163 THREAD_AND_LOCATION,
4164 vmSymbolHandles::java_lang_ClassFormatError(),
4165 "Illegal class name \"%s\" in class file %s", bytes,
4166 _class_name->as_C_string()
4167 );
4168 return;
4169 }
4170 }
4171
4172 // Checks if name is a legal field name.
4173 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
4174 if (!_need_verify || _relax_verify) { return; }
4175
4176 char buf[fixed_buffer_size];
4177 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4178 unsigned int length = name->utf8_length();
4179 bool legal = false;
4180
4181 if (length > 0) {
4182 if (_major_version < JAVA_1_5_VERSION) {
4183 if (bytes[0] != '<') {
4184 char* p = skip_over_field_name(bytes, false, length);
4185 legal = (p != NULL) && ((p - bytes) == (int)length);
4186 }
4187 } else {
4188 // 4881221: relax the constraints based on JSR202 spec
4189 legal = verify_unqualified_name(bytes, length, LegalField);
4190 }
4191 }
4192
4193 if (!legal) {
4194 ResourceMark rm(THREAD);
4195 Exceptions::fthrow(
4196 THREAD_AND_LOCATION,
4197 vmSymbolHandles::java_lang_ClassFormatError(),
4198 "Illegal field name \"%s\" in class %s", bytes,
4199 _class_name->as_C_string()
4200 );
4201 return;
4202 }
4203 }
4204
4205 // Checks if name is a legal method name.
4206 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
4207 if (!_need_verify || _relax_verify) { return; }
4208
4209 assert(!name.is_null(), "method name is null");
4210 char buf[fixed_buffer_size];
4211 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4212 unsigned int length = name->utf8_length();
4213 bool legal = false;
4214
4215 if (length > 0) {
4216 if (bytes[0] == '<') {
4217 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4218 legal = true;
4219 }
4220 } else if (_major_version < JAVA_1_5_VERSION) {
4221 char* p;
4222 p = skip_over_field_name(bytes, false, length);
4223 legal = (p != NULL) && ((p - bytes) == (int)length);
4224 } else {
4225 // 4881221: relax the constraints based on JSR202 spec
4226 legal = verify_unqualified_name(bytes, length, LegalMethod);
4227 }
4228 }
4229
4230 if (!legal) {
4231 ResourceMark rm(THREAD);
4232 Exceptions::fthrow(
4233 THREAD_AND_LOCATION,
4234 vmSymbolHandles::java_lang_ClassFormatError(),
4235 "Illegal method name \"%s\" in class %s", bytes,
4236 _class_name->as_C_string()
4237 );
4238 return;
4239 }
4240 }
4241
4242
4243 // Checks if signature is a legal field signature.
4244 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4245 if (!_need_verify) { return; }
4246
4247 char buf[fixed_buffer_size];
4248 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4249 unsigned int length = signature->utf8_length();
4250 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4251
4252 if (p == NULL || (p - bytes) != (int)length) {
4253 throwIllegalSignature("Field", name, signature, CHECK);
4254 }
4255 }
4256
4257 // Checks if signature is a legal method signature.
4258 // Returns number of parameters
4259 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4260 if (!_need_verify) {
4261 // make sure caller's args_size will be less than 0 even for non-static
4262 // method so it will be recomputed in compute_size_of_parameters().
4263 return -2;
4264 }
4265
4266 unsigned int args_size = 0;
4267 char buf[fixed_buffer_size];
4268 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4269 unsigned int length = signature->utf8_length();
4270 char* nextp;
4271
4272 // The first character must be a '('
4273 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4274 length--;
4275 // Skip over legal field signatures
4276 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4277 while ((length > 0) && (nextp != NULL)) {
4278 args_size++;
4279 if (p[0] == 'J' || p[0] == 'D') {
4280 args_size++;
4281 }
4282 length -= nextp - p;
4283 p = nextp;
4284 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4285 }
4286 // The first non-signature thing better be a ')'
4287 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4288 length--;
4289 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4290 // All internal methods must return void
4291 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4292 return args_size;
4293 }
4294 } else {
4295 // Now we better just have a return value
4296 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4297 if (nextp && ((int)length == (nextp - p))) {
4298 return args_size;
4299 }
4300 }
4301 }
4302 }
4303 // Report error
4304 throwIllegalSignature("Method", name, signature, CHECK_0);
4305 return 0;
4306 }
4307
4308
4309 // Unqualified names may not contain the characters '.', ';', or '/'.
4310 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
4311 // Note that method names may not be <init> or <clinit> in this method.
4312 // Because these names have been checked as special cases before calling this method
4313 // in verify_legal_method_name.
4314 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
4315 jchar ch;
4316
4317 for (char* p = name; p != name + length; ) {
4318 ch = *p;
4319 if (ch < 128) {
4320 p++;
4321 if (ch == '.' || ch == ';') {
4322 return false; // do not permit '.' or ';'
4323 }
4324 if (type != LegalClass && ch == '/') {
4325 return false; // do not permit '/' unless it's class name
4326 }
4327 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4328 return false; // do not permit '<' or '>' in method names
4329 }
4330 } else {
4331 char* tmp_p = UTF8::next(p, &ch);
4332 p = tmp_p;
4333 }
4334 }
4335 return true;
4336 }
4337
4338
4339 // Take pointer to a string. Skip over the longest part of the string that could
4340 // be taken as a fieldname. Allow '/' if slash_ok is true.
4341 // Return a pointer to just past the fieldname.
4342 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4343 // being true, we saw consecutive slashes (meaning we were looking for a
4344 // qualified path but found something that was badly-formed).
4345 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4346 char* p;
4347 jchar ch;
4348 jboolean last_is_slash = false;
4349 jboolean not_first_ch = false;
4350
4351 for (p = name; p != name + length; not_first_ch = true) {
4352 char* old_p = p;
4353 ch = *p;
4354 if (ch < 128) {
4355 p++;
4356 // quick check for ascii
4357 if ((ch >= 'a' && ch <= 'z') ||
4358 (ch >= 'A' && ch <= 'Z') ||
4359 (ch == '_' || ch == '$') ||
4360 (not_first_ch && ch >= '0' && ch <= '9')) {
4361 last_is_slash = false;
4362 continue;
4363 }
4364 if (slash_ok && ch == '/') {
4365 if (last_is_slash) {
4366 return NULL; // Don't permit consecutive slashes
4367 }
4368 last_is_slash = true;
4369 continue;
4370 }
4371 } else {
4372 jint unicode_ch;
4373 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4374 p = tmp_p;
4375 last_is_slash = false;
4376 // Check if ch is Java identifier start or is Java identifier part
4377 // 4672820: call java.lang.Character methods directly without generating separate tables.
4378 EXCEPTION_MARK;
4379 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4380
4381 // return value
4382 JavaValue result(T_BOOLEAN);
4383 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4384 JavaCallArguments args;
4385 args.push_int(unicode_ch);
4386
4387 // public static boolean isJavaIdentifierStart(char ch);
4388 JavaCalls::call_static(&result,
4389 klass,
4390 vmSymbolHandles::isJavaIdentifierStart_name(),
4391 vmSymbolHandles::int_bool_signature(),
4392 &args,
4393 THREAD);
4394
4395 if (HAS_PENDING_EXCEPTION) {
4396 CLEAR_PENDING_EXCEPTION;
4397 return 0;
4398 }
4399 if (result.get_jboolean()) {
4400 continue;
4401 }
4402
4403 if (not_first_ch) {
4404 // public static boolean isJavaIdentifierPart(char ch);
4405 JavaCalls::call_static(&result,
4406 klass,
4407 vmSymbolHandles::isJavaIdentifierPart_name(),
4408 vmSymbolHandles::int_bool_signature(),
4409 &args,
4410 THREAD);
4411
4412 if (HAS_PENDING_EXCEPTION) {
4413 CLEAR_PENDING_EXCEPTION;
4414 return 0;
4415 }
4416
4417 if (result.get_jboolean()) {
4418 continue;
4419 }
4420 }
4421 }
4422 return (not_first_ch) ? old_p : NULL;
4423 }
4424 return (not_first_ch) ? p : NULL;
4425 }
4426
4427
4428 // Take pointer to a string. Skip over the longest part of the string that could
4429 // be taken as a field signature. Allow "void" if void_ok.
4430 // Return a pointer to just past the signature.
4431 // Return NULL if no legal signature is found.
4432 char* ClassFileParser::skip_over_field_signature(char* signature,
4433 bool void_ok,
4434 unsigned int length,
4435 TRAPS) {
4436 unsigned int array_dim = 0;
4437 while (length > 0) {
4438 switch (signature[0]) {
4439 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4440 case JVM_SIGNATURE_BOOLEAN:
4441 case JVM_SIGNATURE_BYTE:
4442 case JVM_SIGNATURE_CHAR:
4443 case JVM_SIGNATURE_SHORT:
4444 case JVM_SIGNATURE_INT:
4445 case JVM_SIGNATURE_FLOAT:
4446 case JVM_SIGNATURE_LONG:
4447 case JVM_SIGNATURE_DOUBLE:
4448 return signature + 1;
4449 case JVM_SIGNATURE_CLASS: {
4450 if (_major_version < JAVA_1_5_VERSION) {
4451 // Skip over the class name if one is there
4452 char* p = skip_over_field_name(signature + 1, true, --length);
4453
4454 // The next character better be a semicolon
4455 if (p && (p - signature) > 1 && p[0] == ';') {
4456 return p + 1;
4457 }
4458 } else {
4459 // 4900761: For class version > 48, any unicode is allowed in class name.
4460 length--;
4461 signature++;
4462 while (length > 0 && signature[0] != ';') {
4463 if (signature[0] == '.') {
4464 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4465 }
4466 length--;
4467 signature++;
4468 }
4469 if (signature[0] == ';') { return signature + 1; }
4470 }
4471
4472 return NULL;
4473 }
4474 case JVM_SIGNATURE_ARRAY:
4475 array_dim++;
4476 if (array_dim > 255) {
4477 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4478 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4479 }
4480 // The rest of what's there better be a legal signature
4481 signature++;
4482 length--;
4483 void_ok = false;
4484 break;
4485
4486 default:
4487 return NULL;
4488 }
4489 }
4490 return NULL;
4491 }