1 /*
2 * Copyright (c) 1997, 2010, 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 "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/verificationType.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/gcLocker.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/constantPoolOop.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "oops/klassOop.hpp"
42 #include "oops/klassVtable.hpp"
43 #include "oops/methodOop.hpp"
44 #include "oops/symbolOop.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/perfData.hpp"
48 #include "runtime/reflection.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/timer.hpp"
51 #include "services/classLoadingService.hpp"
52 #include "services/threadService.hpp"
53
54 // We generally try to create the oops directly when parsing, rather than
55 // allocating temporary data structures and copying the bytes twice. A
56 // temporary area is only needed when parsing utf8 entries in the constant
57 // pool and when parsing line number tables.
58
59 // We add assert in debug mode when class format is not checked.
60
61 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
62 #define JAVA_MIN_SUPPORTED_VERSION 45
63 #define JAVA_MAX_SUPPORTED_VERSION 51
64 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
65
66 // Used for two backward compatibility reasons:
67 // - to check for new additions to the class file format in JDK1.5
68 // - to check for bug fixes in the format checker in JDK1.5
69 #define JAVA_1_5_VERSION 49
70
71 // Used for backward compatibility reasons:
72 // - to check for javac bug fixes that happened after 1.5
73 // - also used as the max version when running in jdk6
74 #define JAVA_6_VERSION 50
75
76 // Used for backward compatibility reasons:
77 // - to check NameAndType_info signatures more aggressively
78 #define JAVA_7_VERSION 51
79
80
81 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
82 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
83 // this function (_current can be allocated in a register, with scalar
84 // replacement of aggregates). The _current pointer is copied back to
85 // stream() when this function returns. DON'T call another method within
86 // this method that uses stream().
87 ClassFileStream* cfs0 = stream();
88 ClassFileStream cfs1 = *cfs0;
89 ClassFileStream* cfs = &cfs1;
90 #ifdef ASSERT
91 assert(cfs->allocated_on_stack(),"should be local");
92 u1* old_current = cfs0->current();
93 #endif
94
95 // Used for batching symbol allocations.
96 const char* names[SymbolTable::symbol_alloc_batch_size];
97 int lengths[SymbolTable::symbol_alloc_batch_size];
98 int indices[SymbolTable::symbol_alloc_batch_size];
99 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
100 int names_count = 0;
101
102 // parsing Index 0 is unused
103 for (int index = 1; index < length; index++) {
104 // Each of the following case guarantees one more byte in the stream
105 // for the following tag or the access_flags following constant pool,
106 // so we don't need bounds-check for reading tag.
107 u1 tag = cfs->get_u1_fast();
108 switch (tag) {
109 case JVM_CONSTANT_Class :
110 {
111 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
112 u2 name_index = cfs->get_u2_fast();
113 cp->klass_index_at_put(index, name_index);
114 }
115 break;
116 case JVM_CONSTANT_Fieldref :
117 {
118 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
119 u2 class_index = cfs->get_u2_fast();
120 u2 name_and_type_index = cfs->get_u2_fast();
121 cp->field_at_put(index, class_index, name_and_type_index);
122 }
123 break;
124 case JVM_CONSTANT_Methodref :
125 {
126 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
127 u2 class_index = cfs->get_u2_fast();
128 u2 name_and_type_index = cfs->get_u2_fast();
129 cp->method_at_put(index, class_index, name_and_type_index);
130 }
131 break;
132 case JVM_CONSTANT_InterfaceMethodref :
133 {
134 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
135 u2 class_index = cfs->get_u2_fast();
136 u2 name_and_type_index = cfs->get_u2_fast();
137 cp->interface_method_at_put(index, class_index, name_and_type_index);
138 }
139 break;
140 case JVM_CONSTANT_String :
141 {
142 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
143 u2 string_index = cfs->get_u2_fast();
144 cp->string_index_at_put(index, string_index);
145 }
146 break;
147 case JVM_CONSTANT_MethodHandle :
148 case JVM_CONSTANT_MethodType :
149 if (!EnableMethodHandles ||
150 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
151 classfile_parse_error(
152 (!EnableMethodHandles ?
153 "This JVM does not support constant tag %u in class file %s" :
154 "Class file version does not support constant tag %u in class file %s"),
155 tag, CHECK);
156 }
157 if (tag == JVM_CONSTANT_MethodHandle) {
158 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
159 u1 ref_kind = cfs->get_u1_fast();
160 u2 method_index = cfs->get_u2_fast();
161 cp->method_handle_index_at_put(index, ref_kind, method_index);
162 } else if (tag == JVM_CONSTANT_MethodType) {
163 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
164 u2 signature_index = cfs->get_u2_fast();
165 cp->method_type_index_at_put(index, signature_index);
166 } else {
167 ShouldNotReachHere();
168 }
169 break;
170 case JVM_CONSTANT_InvokeDynamic :
171 {
172 if (!EnableInvokeDynamic ||
173 _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
174 classfile_parse_error(
175 (!EnableInvokeDynamic ?
176 "This JVM does not support constant tag %u in class file %s" :
177 "Class file version does not support constant tag %u in class file %s"),
178 tag, CHECK);
179 }
180 cfs->guarantee_more(5, CHECK); // bsm_index, name_and_type_index, tag/access_flags
181 u2 bootstrap_method_index = cfs->get_u2_fast();
182 u2 name_and_type_index = cfs->get_u2_fast();
183 cp->invoke_dynamic_at_put(index, bootstrap_method_index, name_and_type_index);
184 }
185 break;
186 case JVM_CONSTANT_Integer :
187 {
188 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
189 u4 bytes = cfs->get_u4_fast();
190 cp->int_at_put(index, (jint) bytes);
191 }
192 break;
193 case JVM_CONSTANT_Float :
194 {
195 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
196 u4 bytes = cfs->get_u4_fast();
197 cp->float_at_put(index, *(jfloat*)&bytes);
198 }
199 break;
200 case JVM_CONSTANT_Long :
201 // A mangled type might cause you to overrun allocated memory
202 guarantee_property(index+1 < length,
203 "Invalid constant pool entry %u in class file %s",
204 index, CHECK);
205 {
206 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
207 u8 bytes = cfs->get_u8_fast();
208 cp->long_at_put(index, bytes);
209 }
210 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
211 break;
212 case JVM_CONSTANT_Double :
213 // A mangled type might cause you to overrun allocated memory
214 guarantee_property(index+1 < length,
215 "Invalid constant pool entry %u in class file %s",
216 index, CHECK);
217 {
218 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
219 u8 bytes = cfs->get_u8_fast();
220 cp->double_at_put(index, *(jdouble*)&bytes);
221 }
222 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
223 break;
224 case JVM_CONSTANT_NameAndType :
225 {
226 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
227 u2 name_index = cfs->get_u2_fast();
228 u2 signature_index = cfs->get_u2_fast();
229 cp->name_and_type_at_put(index, name_index, signature_index);
230 }
231 break;
232 case JVM_CONSTANT_Utf8 :
233 {
234 cfs->guarantee_more(2, CHECK); // utf8_length
235 u2 utf8_length = cfs->get_u2_fast();
236 u1* utf8_buffer = cfs->get_u1_buffer();
237 assert(utf8_buffer != NULL, "null utf8 buffer");
238 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
239 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
240 cfs->skip_u1_fast(utf8_length);
241
242 // Before storing the symbol, make sure it's legal
243 if (_need_verify) {
244 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
245 }
246
247 if (AnonymousClasses && has_cp_patch_at(index)) {
248 Handle patch = clear_cp_patch_at(index);
249 guarantee_property(java_lang_String::is_instance(patch()),
250 "Illegal utf8 patch at %d in class file %s",
251 index, CHECK);
252 char* str = java_lang_String::as_utf8_string(patch());
253 // (could use java_lang_String::as_symbol instead, but might as well batch them)
254 utf8_buffer = (u1*) str;
255 utf8_length = (int) strlen(str);
256 }
257
258 unsigned int hash;
259 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
260 if (result == NULL) {
261 names[names_count] = (char*)utf8_buffer;
262 lengths[names_count] = utf8_length;
263 indices[names_count] = index;
264 hashValues[names_count++] = hash;
265 if (names_count == SymbolTable::symbol_alloc_batch_size) {
266 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
267 names_count = 0;
268 }
269 } else {
270 cp->symbol_at_put(index, result);
271 }
272 }
273 break;
274 default:
275 classfile_parse_error(
276 "Unknown constant tag %u in class file %s", tag, CHECK);
277 break;
278 }
279 }
280
281 // Allocate the remaining symbols
282 if (names_count > 0) {
283 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
284 }
285
286 // Copy _current pointer of local copy back to stream().
287 #ifdef ASSERT
288 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
289 #endif
290 cfs0->set_current(cfs1.current());
291 }
292
293 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
294
295 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
296 ClassFileStream* cfs = stream();
297 constantPoolHandle nullHandle;
298
299 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
300 u2 length = cfs->get_u2_fast();
301 guarantee_property(
302 length >= 1, "Illegal constant pool size %u in class file %s",
303 length, CHECK_(nullHandle));
304 constantPoolOop constant_pool =
305 oopFactory::new_constantPool(length,
306 methodOopDesc::IsSafeConc,
307 CHECK_(nullHandle));
308 constantPoolHandle cp (THREAD, constant_pool);
309
310 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
311
312 // parsing constant pool entries
313 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
314
315 int index = 1; // declared outside of loops for portability
316
317 // first verification pass - validate cross references and fixup class and string constants
318 for (index = 1; index < length; index++) { // Index 0 is unused
319 switch (cp->tag_at(index).value()) {
320 case JVM_CONSTANT_Class :
321 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
322 break;
323 case JVM_CONSTANT_Fieldref :
324 // fall through
325 case JVM_CONSTANT_Methodref :
326 // fall through
327 case JVM_CONSTANT_InterfaceMethodref : {
328 if (!_need_verify) break;
329 int klass_ref_index = cp->klass_ref_index_at(index);
330 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
331 check_property(valid_cp_range(klass_ref_index, length) &&
332 is_klass_reference(cp, klass_ref_index),
333 "Invalid constant pool index %u in class file %s",
334 klass_ref_index,
335 CHECK_(nullHandle));
336 check_property(valid_cp_range(name_and_type_ref_index, length) &&
337 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
338 "Invalid constant pool index %u in class file %s",
339 name_and_type_ref_index,
340 CHECK_(nullHandle));
341 break;
342 }
343 case JVM_CONSTANT_String :
344 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
345 break;
346 case JVM_CONSTANT_Integer :
347 break;
348 case JVM_CONSTANT_Float :
349 break;
350 case JVM_CONSTANT_Long :
351 case JVM_CONSTANT_Double :
352 index++;
353 check_property(
354 (index < length && cp->tag_at(index).is_invalid()),
355 "Improper constant pool long/double index %u in class file %s",
356 index, CHECK_(nullHandle));
357 break;
358 case JVM_CONSTANT_NameAndType : {
359 if (!_need_verify) break;
360 int name_ref_index = cp->name_ref_index_at(index);
361 int signature_ref_index = cp->signature_ref_index_at(index);
362 check_property(
363 valid_cp_range(name_ref_index, length) &&
364 cp->tag_at(name_ref_index).is_utf8(),
365 "Invalid constant pool index %u in class file %s",
366 name_ref_index, CHECK_(nullHandle));
367 check_property(
368 valid_cp_range(signature_ref_index, length) &&
369 cp->tag_at(signature_ref_index).is_utf8(),
370 "Invalid constant pool index %u in class file %s",
371 signature_ref_index, CHECK_(nullHandle));
372 break;
373 }
374 case JVM_CONSTANT_Utf8 :
375 break;
376 case JVM_CONSTANT_UnresolvedClass : // fall-through
377 case JVM_CONSTANT_UnresolvedClassInError:
378 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
379 break;
380 case JVM_CONSTANT_ClassIndex :
381 {
382 int class_index = cp->klass_index_at(index);
383 check_property(
384 valid_cp_range(class_index, length) &&
385 cp->tag_at(class_index).is_utf8(),
386 "Invalid constant pool index %u in class file %s",
387 class_index, CHECK_(nullHandle));
388 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
389 }
390 break;
391 case JVM_CONSTANT_UnresolvedString :
392 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
393 break;
394 case JVM_CONSTANT_StringIndex :
395 {
396 int string_index = cp->string_index_at(index);
397 check_property(
398 valid_cp_range(string_index, length) &&
399 cp->tag_at(string_index).is_utf8(),
400 "Invalid constant pool index %u in class file %s",
401 string_index, CHECK_(nullHandle));
402 symbolOop sym = cp->symbol_at(string_index);
403 cp->unresolved_string_at_put(index, sym);
404 }
405 break;
406 case JVM_CONSTANT_MethodHandle :
407 {
408 int ref_index = cp->method_handle_index_at(index);
409 check_property(
410 valid_cp_range(ref_index, length) &&
411 EnableMethodHandles,
412 "Invalid constant pool index %u in class file %s",
413 ref_index, CHECK_(nullHandle));
414 constantTag tag = cp->tag_at(ref_index);
415 int ref_kind = cp->method_handle_ref_kind_at(index);
416 switch (ref_kind) {
417 case JVM_REF_getField:
418 case JVM_REF_getStatic:
419 case JVM_REF_putField:
420 case JVM_REF_putStatic:
421 check_property(
422 tag.is_field(),
423 "Invalid constant pool index %u in class file %s (not a field)",
424 ref_index, CHECK_(nullHandle));
425 break;
426 case JVM_REF_invokeVirtual:
427 case JVM_REF_invokeStatic:
428 case JVM_REF_invokeSpecial:
429 case JVM_REF_newInvokeSpecial:
430 check_property(
431 tag.is_method(),
432 "Invalid constant pool index %u in class file %s (not a method)",
433 ref_index, CHECK_(nullHandle));
434 break;
435 case JVM_REF_invokeInterface:
436 check_property(
437 tag.is_interface_method(),
438 "Invalid constant pool index %u in class file %s (not an interface method)",
439 ref_index, CHECK_(nullHandle));
440 break;
441 default:
442 classfile_parse_error(
443 "Bad method handle kind at constant pool index %u in class file %s",
444 index, CHECK_(nullHandle));
445 }
446 // Keep the ref_index unchanged. It will be indirected at link-time.
447 }
448 break;
449 case JVM_CONSTANT_MethodType :
450 {
451 int ref_index = cp->method_type_index_at(index);
452 check_property(
453 valid_cp_range(ref_index, length) &&
454 cp->tag_at(ref_index).is_utf8() &&
455 EnableMethodHandles,
456 "Invalid constant pool index %u in class file %s",
457 ref_index, CHECK_(nullHandle));
458 }
459 break;
460 case JVM_CONSTANT_InvokeDynamic :
461 {
462 int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
463 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
464 check_property((bootstrap_method_ref_index == 0 && AllowTransitionalJSR292)
465 ||
466 (valid_cp_range(bootstrap_method_ref_index, length) &&
467 cp->tag_at(bootstrap_method_ref_index).is_method_handle()),
468 "Invalid constant pool index %u in class file %s",
469 bootstrap_method_ref_index,
470 CHECK_(nullHandle));
471 check_property(valid_cp_range(name_and_type_ref_index, length) &&
472 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
473 "Invalid constant pool index %u in class file %s",
474 name_and_type_ref_index,
475 CHECK_(nullHandle));
476 break;
477 }
478 default:
479 fatal(err_msg("bad constant pool tag value %u",
480 cp->tag_at(index).value()));
481 ShouldNotReachHere();
482 break;
483 } // end of switch
484 } // end of for
485
486 if (_cp_patches != NULL) {
487 // need to treat this_class specially...
488 assert(AnonymousClasses, "");
489 int this_class_index;
490 {
491 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
492 u1* mark = cfs->current();
493 u2 flags = cfs->get_u2_fast();
494 this_class_index = cfs->get_u2_fast();
495 cfs->set_current(mark); // revert to mark
496 }
497
498 for (index = 1; index < length; index++) { // Index 0 is unused
499 if (has_cp_patch_at(index)) {
500 guarantee_property(index != this_class_index,
501 "Illegal constant pool patch to self at %d in class file %s",
502 index, CHECK_(nullHandle));
503 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
504 }
505 }
506 // Ensure that all the patches have been used.
507 for (index = 0; index < _cp_patches->length(); index++) {
508 guarantee_property(!has_cp_patch_at(index),
509 "Unused constant pool patch at %d in class file %s",
510 index, CHECK_(nullHandle));
511 }
512 }
513
514 if (!_need_verify) {
515 return cp;
516 }
517
518 // second verification pass - checks the strings are of the right format.
519 // but not yet to the other entries
520 for (index = 1; index < length; index++) {
521 jbyte tag = cp->tag_at(index).value();
522 switch (tag) {
523 case JVM_CONSTANT_UnresolvedClass: {
524 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
525 // check the name, even if _cp_patches will overwrite it
526 verify_legal_class_name(class_name, CHECK_(nullHandle));
527 break;
528 }
529 case JVM_CONSTANT_NameAndType: {
530 if (_need_verify && _major_version >= JAVA_7_VERSION) {
531 int sig_index = cp->signature_ref_index_at(index);
532 int name_index = cp->name_ref_index_at(index);
533 symbolHandle name(THREAD, cp->symbol_at(name_index));
534 symbolHandle sig(THREAD, cp->symbol_at(sig_index));
535 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
536 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
537 } else {
538 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
539 }
540 }
541 break;
542 }
543 case JVM_CONSTANT_Fieldref:
544 case JVM_CONSTANT_Methodref:
545 case JVM_CONSTANT_InterfaceMethodref: {
546 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
547 // already verified to be utf8
548 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
549 // already verified to be utf8
550 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
551 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
552 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
553 if (tag == JVM_CONSTANT_Fieldref) {
554 verify_legal_field_name(name, CHECK_(nullHandle));
555 if (_need_verify && _major_version >= JAVA_7_VERSION) {
556 // Signature is verified above, when iterating NameAndType_info.
557 // Need only to be sure it's the right type.
558 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
559 throwIllegalSignature(
560 "Field", name, signature, CHECK_(nullHandle));
561 }
562 } else {
563 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
564 }
565 } else {
566 verify_legal_method_name(name, CHECK_(nullHandle));
567 if (_need_verify && _major_version >= JAVA_7_VERSION) {
568 // Signature is verified above, when iterating NameAndType_info.
569 // Need only to be sure it's the right type.
570 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
571 throwIllegalSignature(
572 "Method", name, signature, CHECK_(nullHandle));
573 }
574 } else {
575 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
576 }
577 if (tag == JVM_CONSTANT_Methodref) {
578 // 4509014: If a class method name begins with '<', it must be "<init>".
579 assert(!name.is_null(), "method name in constant pool is null");
580 unsigned int name_len = name->utf8_length();
581 assert(name_len > 0, "bad method name"); // already verified as legal name
582 if (name->byte_at(0) == '<') {
583 if (name() != vmSymbols::object_initializer_name()) {
584 classfile_parse_error(
585 "Bad method name at constant pool index %u in class file %s",
586 name_ref_index, CHECK_(nullHandle));
587 }
588 }
589 }
590 }
591 break;
592 }
593 case JVM_CONSTANT_MethodHandle: {
594 int ref_index = cp->method_handle_index_at(index);
595 int ref_kind = cp->method_handle_ref_kind_at(index);
596 switch (ref_kind) {
597 case JVM_REF_invokeVirtual:
598 case JVM_REF_invokeStatic:
599 case JVM_REF_invokeSpecial:
600 case JVM_REF_newInvokeSpecial:
601 {
602 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
603 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
604 symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
605 if (ref_kind == JVM_REF_newInvokeSpecial) {
606 if (name() != vmSymbols::object_initializer_name()) {
607 classfile_parse_error(
608 "Bad constructor name at constant pool index %u in class file %s",
609 name_ref_index, CHECK_(nullHandle));
610 }
611 } else {
612 if (name() == vmSymbols::object_initializer_name()) {
613 classfile_parse_error(
614 "Bad method name at constant pool index %u in class file %s",
615 name_ref_index, CHECK_(nullHandle));
616 }
617 }
618 }
619 break;
620 // Other ref_kinds are already fully checked in previous pass.
621 }
622 break;
623 }
624 case JVM_CONSTANT_MethodType: {
625 symbolHandle no_name = vmSymbolHandles::type_name(); // place holder
626 symbolHandle signature(THREAD, cp->method_type_signature_at(index));
627 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
628 break;
629 }
630 } // end of switch
631 } // end of for
632
633 return cp;
634 }
635
636
637 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
638 assert(AnonymousClasses, "");
639 BasicType patch_type = T_VOID;
640 switch (cp->tag_at(index).value()) {
641
642 case JVM_CONSTANT_UnresolvedClass :
643 // Patching a class means pre-resolving it.
644 // The name in the constant pool is ignored.
645 if (java_lang_Class::is_instance(patch())) {
646 guarantee_property(!java_lang_Class::is_primitive(patch()),
647 "Illegal class patch at %d in class file %s",
648 index, CHECK);
649 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
650 } else {
651 guarantee_property(java_lang_String::is_instance(patch()),
652 "Illegal class patch at %d in class file %s",
653 index, CHECK);
654 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
655 cp->unresolved_klass_at_put(index, name());
656 }
657 break;
658
659 case JVM_CONSTANT_UnresolvedString :
660 // Patching a string means pre-resolving it.
661 // The spelling in the constant pool is ignored.
662 // The constant reference may be any object whatever.
663 // If it is not a real interned string, the constant is referred
664 // to as a "pseudo-string", and must be presented to the CP
665 // explicitly, because it may require scavenging.
666 cp->pseudo_string_at_put(index, patch());
667 break;
668
669 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
670 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
671 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
672 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
673 patch_prim:
674 {
675 jvalue value;
676 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
677 guarantee_property(value_type == patch_type,
678 "Illegal primitive patch at %d in class file %s",
679 index, CHECK);
680 switch (value_type) {
681 case T_INT: cp->int_at_put(index, value.i); break;
682 case T_FLOAT: cp->float_at_put(index, value.f); break;
683 case T_LONG: cp->long_at_put(index, value.j); break;
684 case T_DOUBLE: cp->double_at_put(index, value.d); break;
685 default: assert(false, "");
686 }
687 }
688 break;
689
690 default:
691 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
692 guarantee_property(!has_cp_patch_at(index),
693 "Illegal unexpected patch at %d in class file %s",
694 index, CHECK);
695 return;
696 }
697
698 // On fall-through, mark the patch as used.
699 clear_cp_patch_at(index);
700 }
701
702
703
704 class NameSigHash: public ResourceObj {
705 public:
706 symbolOop _name; // name
707 symbolOop _sig; // signature
708 NameSigHash* _next; // Next entry in hash table
709 };
710
711
712 #define HASH_ROW_SIZE 256
713
714 unsigned int hash(symbolOop name, symbolOop sig) {
715 unsigned int raw_hash = 0;
716 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
717 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
718
719 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
720 }
721
722
723 void initialize_hashtable(NameSigHash** table) {
724 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
725 }
726
727 // Return false if the name/sig combination is found in table.
728 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
729 // The old format checker uses heap sort to find duplicates.
730 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
731 // of table since we don't expect symbolOop's to move.
732 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
733 assert(name != NULL, "name in constant pool is NULL");
734
735 // First lookup for duplicates
736 int index = hash(name, sig);
737 NameSigHash* entry = table[index];
738 while (entry != NULL) {
739 if (entry->_name == name && entry->_sig == sig) {
740 return false;
741 }
742 entry = entry->_next;
743 }
744
745 // No duplicate is found, allocate a new entry and fill it.
746 entry = new NameSigHash();
747 entry->_name = name;
748 entry->_sig = sig;
749
750 // Insert into hash table
751 entry->_next = table[index];
752 table[index] = entry;
753
754 return true;
755 }
756
757
758 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
759 int length,
760 Handle class_loader,
761 Handle protection_domain,
762 symbolHandle class_name,
763 TRAPS) {
764 ClassFileStream* cfs = stream();
765 assert(length > 0, "only called for length>0");
766 objArrayHandle nullHandle;
767 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
768 objArrayHandle interfaces (THREAD, interface_oop);
769
770 int index;
771 for (index = 0; index < length; index++) {
772 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
773 KlassHandle interf;
774 check_property(
775 valid_cp_range(interface_index, cp->length()) &&
776 is_klass_reference(cp, interface_index),
777 "Interface name has bad constant pool index %u in class file %s",
778 interface_index, CHECK_(nullHandle));
779 if (cp->tag_at(interface_index).is_klass()) {
780 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
781 } else {
782 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
783
784 // Don't need to check legal name because it's checked when parsing constant pool.
785 // But need to make sure it's not an array type.
786 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
787 "Bad interface name in class file %s", CHECK_(nullHandle));
788
789 // Call resolve_super so classcircularity is checked
790 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
791 unresolved_klass, class_loader, protection_domain,
792 false, CHECK_(nullHandle));
793 interf = KlassHandle(THREAD, k);
794
795 if (LinkWellKnownClasses) // my super type is well known to me
796 cp->klass_at_put(interface_index, interf()); // eagerly resolve
797 }
798
799 if (!Klass::cast(interf())->is_interface()) {
800 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
801 }
802 interfaces->obj_at_put(index, interf());
803 }
804
805 if (!_need_verify || length <= 1) {
806 return interfaces;
807 }
808
809 // Check if there's any duplicates in interfaces
810 ResourceMark rm(THREAD);
811 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
812 THREAD, NameSigHash*, HASH_ROW_SIZE);
813 initialize_hashtable(interface_names);
814 bool dup = false;
815 {
816 debug_only(No_Safepoint_Verifier nsv;)
817 for (index = 0; index < length; index++) {
818 klassOop k = (klassOop)interfaces->obj_at(index);
819 symbolOop name = instanceKlass::cast(k)->name();
820 // If no duplicates, add (name, NULL) in hashtable interface_names.
821 if (!put_after_lookup(name, NULL, interface_names)) {
822 dup = true;
823 break;
824 }
825 }
826 }
827 if (dup) {
828 classfile_parse_error("Duplicate interface name in class file %s",
829 CHECK_(nullHandle));
830 }
831
832 return interfaces;
833 }
834
835
836 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
837 // Make sure the constant pool entry is of a type appropriate to this field
838 guarantee_property(
839 (constantvalue_index > 0 &&
840 constantvalue_index < cp->length()),
841 "Bad initial value index %u in ConstantValue attribute in class file %s",
842 constantvalue_index, CHECK);
843 constantTag value_type = cp->tag_at(constantvalue_index);
844 switch ( cp->basic_type_for_signature_at(signature_index) ) {
845 case T_LONG:
846 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
847 break;
848 case T_FLOAT:
849 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
850 break;
851 case T_DOUBLE:
852 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
853 break;
854 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
855 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
856 break;
857 case T_OBJECT:
858 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
859 && (value_type.is_string() || value_type.is_unresolved_string())),
860 "Bad string initial value in class file %s", CHECK);
861 break;
862 default:
863 classfile_parse_error(
864 "Unable to set initial value %u in class file %s",
865 constantvalue_index, CHECK);
866 }
867 }
868
869
870 // Parse attributes for a field.
871 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
872 u2 attributes_count,
873 bool is_static, u2 signature_index,
874 u2* constantvalue_index_addr,
875 bool* is_synthetic_addr,
876 u2* generic_signature_index_addr,
877 typeArrayHandle* field_annotations,
878 TRAPS) {
879 ClassFileStream* cfs = stream();
880 assert(attributes_count > 0, "length should be greater than 0");
881 u2 constantvalue_index = 0;
882 u2 generic_signature_index = 0;
883 bool is_synthetic = false;
884 u1* runtime_visible_annotations = NULL;
885 int runtime_visible_annotations_length = 0;
886 u1* runtime_invisible_annotations = NULL;
887 int runtime_invisible_annotations_length = 0;
888 while (attributes_count--) {
889 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
890 u2 attribute_name_index = cfs->get_u2_fast();
891 u4 attribute_length = cfs->get_u4_fast();
892 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
893 cp->tag_at(attribute_name_index).is_utf8(),
894 "Invalid field attribute index %u in class file %s",
895 attribute_name_index,
896 CHECK);
897 symbolOop attribute_name = cp->symbol_at(attribute_name_index);
898 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
899 // ignore if non-static
900 if (constantvalue_index != 0) {
901 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
902 }
903 check_property(
904 attribute_length == 2,
905 "Invalid ConstantValue field attribute length %u in class file %s",
906 attribute_length, CHECK);
907 constantvalue_index = cfs->get_u2(CHECK);
908 if (_need_verify) {
909 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
910 }
911 } else if (attribute_name == vmSymbols::tag_synthetic()) {
912 if (attribute_length != 0) {
913 classfile_parse_error(
914 "Invalid Synthetic field attribute length %u in class file %s",
915 attribute_length, CHECK);
916 }
917 is_synthetic = true;
918 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
919 if (attribute_length != 0) {
920 classfile_parse_error(
921 "Invalid Deprecated field attribute length %u in class file %s",
922 attribute_length, CHECK);
923 }
924 } else if (_major_version >= JAVA_1_5_VERSION) {
925 if (attribute_name == vmSymbols::tag_signature()) {
926 if (attribute_length != 2) {
927 classfile_parse_error(
928 "Wrong size %u for field's Signature attribute in class file %s",
929 attribute_length, CHECK);
930 }
931 generic_signature_index = cfs->get_u2(CHECK);
932 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
933 runtime_visible_annotations_length = attribute_length;
934 runtime_visible_annotations = cfs->get_u1_buffer();
935 assert(runtime_visible_annotations != NULL, "null visible annotations");
936 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
937 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
938 runtime_invisible_annotations_length = attribute_length;
939 runtime_invisible_annotations = cfs->get_u1_buffer();
940 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
941 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
942 } else {
943 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
944 }
945 } else {
946 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
947 }
948 }
949
950 *constantvalue_index_addr = constantvalue_index;
951 *is_synthetic_addr = is_synthetic;
952 *generic_signature_index_addr = generic_signature_index;
953 *field_annotations = assemble_annotations(runtime_visible_annotations,
954 runtime_visible_annotations_length,
955 runtime_invisible_annotations,
956 runtime_invisible_annotations_length,
957 CHECK);
958 return;
959 }
960
961
962 // Field allocation types. Used for computing field offsets.
963
964 enum FieldAllocationType {
965 STATIC_OOP, // Oops
966 STATIC_BYTE, // Boolean, Byte, char
967 STATIC_SHORT, // shorts
968 STATIC_WORD, // ints
969 STATIC_DOUBLE, // long or double
970 STATIC_ALIGNED_DOUBLE,// aligned long or double
971 NONSTATIC_OOP,
972 NONSTATIC_BYTE,
973 NONSTATIC_SHORT,
974 NONSTATIC_WORD,
975 NONSTATIC_DOUBLE,
976 NONSTATIC_ALIGNED_DOUBLE
977 };
978
979
980 struct FieldAllocationCount {
981 unsigned int static_oop_count;
982 unsigned int static_byte_count;
983 unsigned int static_short_count;
984 unsigned int static_word_count;
985 unsigned int static_double_count;
986 unsigned int nonstatic_oop_count;
987 unsigned int nonstatic_byte_count;
988 unsigned int nonstatic_short_count;
989 unsigned int nonstatic_word_count;
990 unsigned int nonstatic_double_count;
991 };
992
993 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
994 struct FieldAllocationCount *fac,
995 objArrayHandle* fields_annotations, TRAPS) {
996 ClassFileStream* cfs = stream();
997 typeArrayHandle nullHandle;
998 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
999 u2 length = cfs->get_u2_fast();
1000 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1001 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
1002 typeArrayHandle fields(THREAD, new_fields);
1003
1004 int index = 0;
1005 typeArrayHandle field_annotations;
1006 for (int n = 0; n < length; n++) {
1007 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1008
1009 AccessFlags access_flags;
1010 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1011 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1012 access_flags.set_flags(flags);
1013
1014 u2 name_index = cfs->get_u2_fast();
1015 int cp_size = cp->length();
1016 check_property(
1017 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1018 "Invalid constant pool index %u for field name in class file %s",
1019 name_index, CHECK_(nullHandle));
1020 symbolHandle name(THREAD, cp->symbol_at(name_index));
1021 verify_legal_field_name(name, CHECK_(nullHandle));
1022
1023 u2 signature_index = cfs->get_u2_fast();
1024 check_property(
1025 valid_cp_range(signature_index, cp_size) &&
1026 cp->tag_at(signature_index).is_utf8(),
1027 "Invalid constant pool index %u for field signature in class file %s",
1028 signature_index, CHECK_(nullHandle));
1029 symbolHandle sig(THREAD, cp->symbol_at(signature_index));
1030 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1031
1032 u2 constantvalue_index = 0;
1033 bool is_synthetic = false;
1034 u2 generic_signature_index = 0;
1035 bool is_static = access_flags.is_static();
1036
1037 u2 attributes_count = cfs->get_u2_fast();
1038 if (attributes_count > 0) {
1039 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1040 &constantvalue_index, &is_synthetic,
1041 &generic_signature_index, &field_annotations,
1042 CHECK_(nullHandle));
1043 if (field_annotations.not_null()) {
1044 if (fields_annotations->is_null()) {
1045 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1046 *fields_annotations = objArrayHandle(THREAD, md);
1047 }
1048 (*fields_annotations)->obj_at_put(n, field_annotations());
1049 }
1050 if (is_synthetic) {
1051 access_flags.set_is_synthetic();
1052 }
1053 }
1054
1055 fields->short_at_put(index++, access_flags.as_short());
1056 fields->short_at_put(index++, name_index);
1057 fields->short_at_put(index++, signature_index);
1058 fields->short_at_put(index++, constantvalue_index);
1059
1060 // Remember how many oops we encountered and compute allocation type
1061 BasicType type = cp->basic_type_for_signature_at(signature_index);
1062 FieldAllocationType atype;
1063 if ( is_static ) {
1064 switch ( type ) {
1065 case T_BOOLEAN:
1066 case T_BYTE:
1067 fac->static_byte_count++;
1068 atype = STATIC_BYTE;
1069 break;
1070 case T_LONG:
1071 case T_DOUBLE:
1072 if (Universe::field_type_should_be_aligned(type)) {
1073 atype = STATIC_ALIGNED_DOUBLE;
1074 } else {
1075 atype = STATIC_DOUBLE;
1076 }
1077 fac->static_double_count++;
1078 break;
1079 case T_CHAR:
1080 case T_SHORT:
1081 fac->static_short_count++;
1082 atype = STATIC_SHORT;
1083 break;
1084 case T_FLOAT:
1085 case T_INT:
1086 fac->static_word_count++;
1087 atype = STATIC_WORD;
1088 break;
1089 case T_ARRAY:
1090 case T_OBJECT:
1091 fac->static_oop_count++;
1092 atype = STATIC_OOP;
1093 break;
1094 case T_ADDRESS:
1095 case T_VOID:
1096 default:
1097 assert(0, "bad field type");
1098 }
1099 } else {
1100 switch ( type ) {
1101 case T_BOOLEAN:
1102 case T_BYTE:
1103 fac->nonstatic_byte_count++;
1104 atype = NONSTATIC_BYTE;
1105 break;
1106 case T_LONG:
1107 case T_DOUBLE:
1108 if (Universe::field_type_should_be_aligned(type)) {
1109 atype = NONSTATIC_ALIGNED_DOUBLE;
1110 } else {
1111 atype = NONSTATIC_DOUBLE;
1112 }
1113 fac->nonstatic_double_count++;
1114 break;
1115 case T_CHAR:
1116 case T_SHORT:
1117 fac->nonstatic_short_count++;
1118 atype = NONSTATIC_SHORT;
1119 break;
1120 case T_FLOAT:
1121 case T_INT:
1122 fac->nonstatic_word_count++;
1123 atype = NONSTATIC_WORD;
1124 break;
1125 case T_ARRAY:
1126 case T_OBJECT:
1127 fac->nonstatic_oop_count++;
1128 atype = NONSTATIC_OOP;
1129 break;
1130 case T_ADDRESS:
1131 case T_VOID:
1132 default:
1133 assert(0, "bad field type");
1134 }
1135 }
1136
1137 // The correct offset is computed later (all oop fields will be located together)
1138 // We temporarily store the allocation type in the offset field
1139 fields->short_at_put(index++, atype);
1140 fields->short_at_put(index++, 0); // Clear out high word of byte offset
1141 fields->short_at_put(index++, generic_signature_index);
1142 }
1143
1144 if (_need_verify && length > 1) {
1145 // Check duplicated fields
1146 ResourceMark rm(THREAD);
1147 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1148 THREAD, NameSigHash*, HASH_ROW_SIZE);
1149 initialize_hashtable(names_and_sigs);
1150 bool dup = false;
1151 {
1152 debug_only(No_Safepoint_Verifier nsv;)
1153 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1154 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1155 symbolOop name = cp->symbol_at(name_index);
1156 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1157 symbolOop sig = cp->symbol_at(sig_index);
1158 // If no duplicates, add name/signature in hashtable names_and_sigs.
1159 if (!put_after_lookup(name, sig, names_and_sigs)) {
1160 dup = true;
1161 break;
1162 }
1163 }
1164 }
1165 if (dup) {
1166 classfile_parse_error("Duplicate field name&signature in class file %s",
1167 CHECK_(nullHandle));
1168 }
1169 }
1170
1171 return fields;
1172 }
1173
1174
1175 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1176 while (length-- > 0) {
1177 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1178 }
1179 }
1180
1181
1182 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1183 u4 exception_table_length,
1184 constantPoolHandle cp,
1185 TRAPS) {
1186 ClassFileStream* cfs = stream();
1187 typeArrayHandle nullHandle;
1188
1189 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1190 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1191 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1192
1193 int index = 0;
1194 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1195 for (unsigned int i = 0; i < exception_table_length; i++) {
1196 u2 start_pc = cfs->get_u2_fast();
1197 u2 end_pc = cfs->get_u2_fast();
1198 u2 handler_pc = cfs->get_u2_fast();
1199 u2 catch_type_index = cfs->get_u2_fast();
1200 // Will check legal target after parsing code array in verifier.
1201 if (_need_verify) {
1202 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1203 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1204 guarantee_property(handler_pc < code_length,
1205 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1206 if (catch_type_index != 0) {
1207 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1208 is_klass_reference(cp, catch_type_index),
1209 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1210 }
1211 }
1212 exception_handlers->int_at_put(index++, start_pc);
1213 exception_handlers->int_at_put(index++, end_pc);
1214 exception_handlers->int_at_put(index++, handler_pc);
1215 exception_handlers->int_at_put(index++, catch_type_index);
1216 }
1217 return exception_handlers;
1218 }
1219
1220 void ClassFileParser::parse_linenumber_table(
1221 u4 code_attribute_length, u4 code_length,
1222 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1223 ClassFileStream* cfs = stream();
1224 unsigned int num_entries = cfs->get_u2(CHECK);
1225
1226 // Each entry is a u2 start_pc, and a u2 line_number
1227 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1228
1229 // Verify line number attribute and table length
1230 check_property(
1231 code_attribute_length == sizeof(u2) + length_in_bytes,
1232 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1233
1234 cfs->guarantee_more(length_in_bytes, CHECK);
1235
1236 if ((*write_stream) == NULL) {
1237 if (length_in_bytes > fixed_buffer_size) {
1238 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1239 } else {
1240 (*write_stream) = new CompressedLineNumberWriteStream(
1241 linenumbertable_buffer, fixed_buffer_size);
1242 }
1243 }
1244
1245 while (num_entries-- > 0) {
1246 u2 bci = cfs->get_u2_fast(); // start_pc
1247 u2 line = cfs->get_u2_fast(); // line_number
1248 guarantee_property(bci < code_length,
1249 "Invalid pc in LineNumberTable in class file %s", CHECK);
1250 (*write_stream)->write_pair(bci, line);
1251 }
1252 }
1253
1254
1255 // Class file LocalVariableTable elements.
1256 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1257 public:
1258 u2 start_bci;
1259 u2 length;
1260 u2 name_cp_index;
1261 u2 descriptor_cp_index;
1262 u2 slot;
1263 };
1264
1265
1266 class LVT_Hash: public CHeapObj {
1267 public:
1268 LocalVariableTableElement *_elem; // element
1269 LVT_Hash* _next; // Next entry in hash table
1270 };
1271
1272 unsigned int hash(LocalVariableTableElement *elem) {
1273 unsigned int raw_hash = elem->start_bci;
1274
1275 raw_hash = elem->length + raw_hash * 37;
1276 raw_hash = elem->name_cp_index + raw_hash * 37;
1277 raw_hash = elem->slot + raw_hash * 37;
1278
1279 return raw_hash % HASH_ROW_SIZE;
1280 }
1281
1282 void initialize_hashtable(LVT_Hash** table) {
1283 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1284 table[i] = NULL;
1285 }
1286 }
1287
1288 void clear_hashtable(LVT_Hash** table) {
1289 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1290 LVT_Hash* current = table[i];
1291 LVT_Hash* next;
1292 while (current != NULL) {
1293 next = current->_next;
1294 current->_next = NULL;
1295 delete(current);
1296 current = next;
1297 }
1298 table[i] = NULL;
1299 }
1300 }
1301
1302 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1303 LVT_Hash* entry = table[index];
1304
1305 /*
1306 * 3-tuple start_bci/length/slot has to be unique key,
1307 * so the following comparison seems to be redundant:
1308 * && elem->name_cp_index == entry->_elem->name_cp_index
1309 */
1310 while (entry != NULL) {
1311 if (elem->start_bci == entry->_elem->start_bci
1312 && elem->length == entry->_elem->length
1313 && elem->name_cp_index == entry->_elem->name_cp_index
1314 && elem->slot == entry->_elem->slot
1315 ) {
1316 return entry;
1317 }
1318 entry = entry->_next;
1319 }
1320 return NULL;
1321 }
1322
1323 // Return false if the local variable is found in table.
1324 // Return true if no duplicate is found.
1325 // And local variable is added as a new entry in table.
1326 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1327 // First lookup for duplicates
1328 int index = hash(elem);
1329 LVT_Hash* entry = LVT_lookup(elem, index, table);
1330
1331 if (entry != NULL) {
1332 return false;
1333 }
1334 // No duplicate is found, allocate a new entry and fill it.
1335 if ((entry = new LVT_Hash()) == NULL) {
1336 return false;
1337 }
1338 entry->_elem = elem;
1339
1340 // Insert into hash table
1341 entry->_next = table[index];
1342 table[index] = entry;
1343
1344 return true;
1345 }
1346
1347 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1348 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1349 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1350 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1351 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1352 lvt->signature_cp_index = 0;
1353 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1354 }
1355
1356 // Function is used to parse both attributes:
1357 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1358 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1359 u2 max_locals,
1360 u4 code_attribute_length,
1361 constantPoolHandle cp,
1362 u2* localvariable_table_length,
1363 bool isLVTT,
1364 TRAPS) {
1365 ClassFileStream* cfs = stream();
1366 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1367 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1368 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1369 // Verify local variable table attribute has right length
1370 if (_need_verify) {
1371 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1372 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1373 }
1374 u2* localvariable_table_start = cfs->get_u2_buffer();
1375 assert(localvariable_table_start != NULL, "null local variable table");
1376 if (!_need_verify) {
1377 cfs->skip_u2_fast(size);
1378 } else {
1379 cfs->guarantee_more(size * 2, CHECK_NULL);
1380 for(int i = 0; i < (*localvariable_table_length); i++) {
1381 u2 start_pc = cfs->get_u2_fast();
1382 u2 length = cfs->get_u2_fast();
1383 u2 name_index = cfs->get_u2_fast();
1384 u2 descriptor_index = cfs->get_u2_fast();
1385 u2 index = cfs->get_u2_fast();
1386 // Assign to a u4 to avoid overflow
1387 u4 end_pc = (u4)start_pc + (u4)length;
1388
1389 if (start_pc >= code_length) {
1390 classfile_parse_error(
1391 "Invalid start_pc %u in %s in class file %s",
1392 start_pc, tbl_name, CHECK_NULL);
1393 }
1394 if (end_pc > code_length) {
1395 classfile_parse_error(
1396 "Invalid length %u in %s in class file %s",
1397 length, tbl_name, CHECK_NULL);
1398 }
1399 int cp_size = cp->length();
1400 guarantee_property(
1401 valid_cp_range(name_index, cp_size) &&
1402 cp->tag_at(name_index).is_utf8(),
1403 "Name index %u in %s has bad constant type in class file %s",
1404 name_index, tbl_name, CHECK_NULL);
1405 guarantee_property(
1406 valid_cp_range(descriptor_index, cp_size) &&
1407 cp->tag_at(descriptor_index).is_utf8(),
1408 "Signature index %u in %s has bad constant type in class file %s",
1409 descriptor_index, tbl_name, CHECK_NULL);
1410
1411 symbolHandle name(THREAD, cp->symbol_at(name_index));
1412 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1413 verify_legal_field_name(name, CHECK_NULL);
1414 u2 extra_slot = 0;
1415 if (!isLVTT) {
1416 verify_legal_field_signature(name, sig, CHECK_NULL);
1417
1418 // 4894874: check special cases for double and long local variables
1419 if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1420 sig() == vmSymbols::type_signature(T_LONG)) {
1421 extra_slot = 1;
1422 }
1423 }
1424 guarantee_property((index + extra_slot) < max_locals,
1425 "Invalid index %u in %s in class file %s",
1426 index, tbl_name, CHECK_NULL);
1427 }
1428 }
1429 return localvariable_table_start;
1430 }
1431
1432
1433 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1434 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1435 ClassFileStream* cfs = stream();
1436 u2 index = 0; // index in the array with long/double occupying two slots
1437 u4 i1 = *u1_index;
1438 u4 i2 = *u2_index + 1;
1439 for(int i = 0; i < array_length; i++) {
1440 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1441 index++;
1442 if (tag == ITEM_Long || tag == ITEM_Double) {
1443 index++;
1444 } else if (tag == ITEM_Object) {
1445 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1446 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1447 is_klass_reference(cp, class_index),
1448 "Bad class index %u in StackMap in class file %s",
1449 class_index, CHECK);
1450 } else if (tag == ITEM_Uninitialized) {
1451 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1452 guarantee_property(
1453 offset < code_length,
1454 "Bad uninitialized type offset %u in StackMap in class file %s",
1455 offset, CHECK);
1456 } else {
1457 guarantee_property(
1458 tag <= (u1)ITEM_Uninitialized,
1459 "Unknown variable type %u in StackMap in class file %s",
1460 tag, CHECK);
1461 }
1462 }
1463 u2_array[*u2_index] = index;
1464 *u1_index = i1;
1465 *u2_index = i2;
1466 }
1467
1468 typeArrayOop ClassFileParser::parse_stackmap_table(
1469 u4 code_attribute_length, TRAPS) {
1470 if (code_attribute_length == 0)
1471 return NULL;
1472
1473 ClassFileStream* cfs = stream();
1474 u1* stackmap_table_start = cfs->get_u1_buffer();
1475 assert(stackmap_table_start != NULL, "null stackmap table");
1476
1477 // check code_attribute_length first
1478 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1479
1480 if (!_need_verify && !DumpSharedSpaces) {
1481 return NULL;
1482 }
1483
1484 typeArrayOop stackmap_data =
1485 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1486
1487 stackmap_data->set_length(code_attribute_length);
1488 memcpy((void*)stackmap_data->byte_at_addr(0),
1489 (void*)stackmap_table_start, code_attribute_length);
1490 return stackmap_data;
1491 }
1492
1493 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1494 u4 method_attribute_length,
1495 constantPoolHandle cp, TRAPS) {
1496 ClassFileStream* cfs = stream();
1497 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1498 *checked_exceptions_length = cfs->get_u2_fast();
1499 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1500 u2* checked_exceptions_start = cfs->get_u2_buffer();
1501 assert(checked_exceptions_start != NULL, "null checked exceptions");
1502 if (!_need_verify) {
1503 cfs->skip_u2_fast(size);
1504 } else {
1505 // Verify each value in the checked exception table
1506 u2 checked_exception;
1507 u2 len = *checked_exceptions_length;
1508 cfs->guarantee_more(2 * len, CHECK_NULL);
1509 for (int i = 0; i < len; i++) {
1510 checked_exception = cfs->get_u2_fast();
1511 check_property(
1512 valid_cp_range(checked_exception, cp->length()) &&
1513 is_klass_reference(cp, checked_exception),
1514 "Exception name has bad type at constant pool %u in class file %s",
1515 checked_exception, CHECK_NULL);
1516 }
1517 }
1518 // check exceptions attribute length
1519 if (_need_verify) {
1520 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1521 sizeof(u2) * size),
1522 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1523 }
1524 return checked_exceptions_start;
1525 }
1526
1527 void ClassFileParser::throwIllegalSignature(
1528 const char* type, symbolHandle name, symbolHandle sig, TRAPS) {
1529 ResourceMark rm(THREAD);
1530 Exceptions::fthrow(THREAD_AND_LOCATION,
1531 vmSymbols::java_lang_ClassFormatError(),
1532 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1533 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1534 }
1535
1536 #define MAX_ARGS_SIZE 255
1537 #define MAX_CODE_SIZE 65535
1538 #define INITIAL_MAX_LVT_NUMBER 256
1539
1540 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1541 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1542 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1543 // entire method attribute is parsed.
1544 //
1545 // The promoted_flags parameter is used to pass relevant access_flags
1546 // from the method back up to the containing klass. These flag values
1547 // are added to klass's access_flags.
1548
1549 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1550 AccessFlags *promoted_flags,
1551 typeArrayHandle* method_annotations,
1552 typeArrayHandle* method_parameter_annotations,
1553 typeArrayHandle* method_default_annotations,
1554 TRAPS) {
1555 ClassFileStream* cfs = stream();
1556 methodHandle nullHandle;
1557 ResourceMark rm(THREAD);
1558 // Parse fixed parts
1559 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1560
1561 int flags = cfs->get_u2_fast();
1562 u2 name_index = cfs->get_u2_fast();
1563 int cp_size = cp->length();
1564 check_property(
1565 valid_cp_range(name_index, cp_size) &&
1566 cp->tag_at(name_index).is_utf8(),
1567 "Illegal constant pool index %u for method name in class file %s",
1568 name_index, CHECK_(nullHandle));
1569 symbolHandle name(THREAD, cp->symbol_at(name_index));
1570 verify_legal_method_name(name, CHECK_(nullHandle));
1571
1572 u2 signature_index = cfs->get_u2_fast();
1573 guarantee_property(
1574 valid_cp_range(signature_index, cp_size) &&
1575 cp->tag_at(signature_index).is_utf8(),
1576 "Illegal constant pool index %u for method signature in class file %s",
1577 signature_index, CHECK_(nullHandle));
1578 symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1579
1580 AccessFlags access_flags;
1581 if (name == vmSymbols::class_initializer_name()) {
1582 // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1583 flags = JVM_ACC_STATIC;
1584 } else {
1585 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1586 }
1587
1588 int args_size = -1; // only used when _need_verify is true
1589 if (_need_verify) {
1590 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1591 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1592 if (args_size > MAX_ARGS_SIZE) {
1593 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1594 }
1595 }
1596
1597 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1598
1599 // Default values for code and exceptions attribute elements
1600 u2 max_stack = 0;
1601 u2 max_locals = 0;
1602 u4 code_length = 0;
1603 u1* code_start = 0;
1604 u2 exception_table_length = 0;
1605 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1606 u2 checked_exceptions_length = 0;
1607 u2* checked_exceptions_start = NULL;
1608 CompressedLineNumberWriteStream* linenumber_table = NULL;
1609 int linenumber_table_length = 0;
1610 int total_lvt_length = 0;
1611 u2 lvt_cnt = 0;
1612 u2 lvtt_cnt = 0;
1613 bool lvt_allocated = false;
1614 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1615 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1616 u2* localvariable_table_length;
1617 u2** localvariable_table_start;
1618 u2* localvariable_type_table_length;
1619 u2** localvariable_type_table_start;
1620 bool parsed_code_attribute = false;
1621 bool parsed_checked_exceptions_attribute = false;
1622 bool parsed_stackmap_attribute = false;
1623 // stackmap attribute - JDK1.5
1624 typeArrayHandle stackmap_data;
1625 u2 generic_signature_index = 0;
1626 u1* runtime_visible_annotations = NULL;
1627 int runtime_visible_annotations_length = 0;
1628 u1* runtime_invisible_annotations = NULL;
1629 int runtime_invisible_annotations_length = 0;
1630 u1* runtime_visible_parameter_annotations = NULL;
1631 int runtime_visible_parameter_annotations_length = 0;
1632 u1* runtime_invisible_parameter_annotations = NULL;
1633 int runtime_invisible_parameter_annotations_length = 0;
1634 u1* annotation_default = NULL;
1635 int annotation_default_length = 0;
1636
1637 // Parse code and exceptions attribute
1638 u2 method_attributes_count = cfs->get_u2_fast();
1639 while (method_attributes_count--) {
1640 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1641 u2 method_attribute_name_index = cfs->get_u2_fast();
1642 u4 method_attribute_length = cfs->get_u4_fast();
1643 check_property(
1644 valid_cp_range(method_attribute_name_index, cp_size) &&
1645 cp->tag_at(method_attribute_name_index).is_utf8(),
1646 "Invalid method attribute name index %u in class file %s",
1647 method_attribute_name_index, CHECK_(nullHandle));
1648
1649 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1650 if (method_attribute_name == vmSymbols::tag_code()) {
1651 // Parse Code attribute
1652 if (_need_verify) {
1653 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1654 "Code attribute in native or abstract methods in class file %s",
1655 CHECK_(nullHandle));
1656 }
1657 if (parsed_code_attribute) {
1658 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1659 }
1660 parsed_code_attribute = true;
1661
1662 // Stack size, locals size, and code size
1663 if (_major_version == 45 && _minor_version <= 2) {
1664 cfs->guarantee_more(4, CHECK_(nullHandle));
1665 max_stack = cfs->get_u1_fast();
1666 max_locals = cfs->get_u1_fast();
1667 code_length = cfs->get_u2_fast();
1668 } else {
1669 cfs->guarantee_more(8, CHECK_(nullHandle));
1670 max_stack = cfs->get_u2_fast();
1671 max_locals = cfs->get_u2_fast();
1672 code_length = cfs->get_u4_fast();
1673 }
1674 if (_need_verify) {
1675 guarantee_property(args_size <= max_locals,
1676 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1677 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1678 "Invalid method Code length %u in class file %s",
1679 code_length, CHECK_(nullHandle));
1680 }
1681 // Code pointer
1682 code_start = cfs->get_u1_buffer();
1683 assert(code_start != NULL, "null code start");
1684 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1685 cfs->skip_u1_fast(code_length);
1686
1687 // Exception handler table
1688 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1689 exception_table_length = cfs->get_u2_fast();
1690 if (exception_table_length > 0) {
1691 exception_handlers =
1692 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1693 }
1694
1695 // Parse additional attributes in code attribute
1696 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1697 u2 code_attributes_count = cfs->get_u2_fast();
1698
1699 unsigned int calculated_attribute_length = 0;
1700
1701 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1702 calculated_attribute_length =
1703 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1704 } else {
1705 // max_stack, locals and length are smaller in pre-version 45.2 classes
1706 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1707 }
1708 calculated_attribute_length +=
1709 code_length +
1710 sizeof(exception_table_length) +
1711 sizeof(code_attributes_count) +
1712 exception_table_length *
1713 ( sizeof(u2) + // start_pc
1714 sizeof(u2) + // end_pc
1715 sizeof(u2) + // handler_pc
1716 sizeof(u2) ); // catch_type_index
1717
1718 while (code_attributes_count--) {
1719 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1720 u2 code_attribute_name_index = cfs->get_u2_fast();
1721 u4 code_attribute_length = cfs->get_u4_fast();
1722 calculated_attribute_length += code_attribute_length +
1723 sizeof(code_attribute_name_index) +
1724 sizeof(code_attribute_length);
1725 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1726 cp->tag_at(code_attribute_name_index).is_utf8(),
1727 "Invalid code attribute name index %u in class file %s",
1728 code_attribute_name_index,
1729 CHECK_(nullHandle));
1730 if (LoadLineNumberTables &&
1731 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1732 // Parse and compress line number table
1733 parse_linenumber_table(code_attribute_length, code_length,
1734 &linenumber_table, CHECK_(nullHandle));
1735
1736 } else if (LoadLocalVariableTables &&
1737 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1738 // Parse local variable table
1739 if (!lvt_allocated) {
1740 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1741 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1742 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1743 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1744 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1745 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1746 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1747 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1748 lvt_allocated = true;
1749 }
1750 if (lvt_cnt == max_lvt_cnt) {
1751 max_lvt_cnt <<= 1;
1752 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1753 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1754 }
1755 localvariable_table_start[lvt_cnt] =
1756 parse_localvariable_table(code_length,
1757 max_locals,
1758 code_attribute_length,
1759 cp,
1760 &localvariable_table_length[lvt_cnt],
1761 false, // is not LVTT
1762 CHECK_(nullHandle));
1763 total_lvt_length += localvariable_table_length[lvt_cnt];
1764 lvt_cnt++;
1765 } else if (LoadLocalVariableTypeTables &&
1766 _major_version >= JAVA_1_5_VERSION &&
1767 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1768 if (!lvt_allocated) {
1769 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1770 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1771 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1772 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1773 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1774 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1775 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1776 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1777 lvt_allocated = true;
1778 }
1779 // Parse local variable type table
1780 if (lvtt_cnt == max_lvtt_cnt) {
1781 max_lvtt_cnt <<= 1;
1782 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1783 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1784 }
1785 localvariable_type_table_start[lvtt_cnt] =
1786 parse_localvariable_table(code_length,
1787 max_locals,
1788 code_attribute_length,
1789 cp,
1790 &localvariable_type_table_length[lvtt_cnt],
1791 true, // is LVTT
1792 CHECK_(nullHandle));
1793 lvtt_cnt++;
1794 } else if (UseSplitVerifier &&
1795 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1796 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1797 // Stack map is only needed by the new verifier in JDK1.5.
1798 if (parsed_stackmap_attribute) {
1799 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1800 }
1801 typeArrayOop sm =
1802 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1803 stackmap_data = typeArrayHandle(THREAD, sm);
1804 parsed_stackmap_attribute = true;
1805 } else {
1806 // Skip unknown attributes
1807 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1808 }
1809 }
1810 // check method attribute length
1811 if (_need_verify) {
1812 guarantee_property(method_attribute_length == calculated_attribute_length,
1813 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1814 }
1815 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1816 // Parse Exceptions attribute
1817 if (parsed_checked_exceptions_attribute) {
1818 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1819 }
1820 parsed_checked_exceptions_attribute = true;
1821 checked_exceptions_start =
1822 parse_checked_exceptions(&checked_exceptions_length,
1823 method_attribute_length,
1824 cp, CHECK_(nullHandle));
1825 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1826 if (method_attribute_length != 0) {
1827 classfile_parse_error(
1828 "Invalid Synthetic method attribute length %u in class file %s",
1829 method_attribute_length, CHECK_(nullHandle));
1830 }
1831 // Should we check that there hasn't already been a synthetic attribute?
1832 access_flags.set_is_synthetic();
1833 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1834 if (method_attribute_length != 0) {
1835 classfile_parse_error(
1836 "Invalid Deprecated method attribute length %u in class file %s",
1837 method_attribute_length, CHECK_(nullHandle));
1838 }
1839 } else if (_major_version >= JAVA_1_5_VERSION) {
1840 if (method_attribute_name == vmSymbols::tag_signature()) {
1841 if (method_attribute_length != 2) {
1842 classfile_parse_error(
1843 "Invalid Signature attribute length %u in class file %s",
1844 method_attribute_length, CHECK_(nullHandle));
1845 }
1846 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1847 generic_signature_index = cfs->get_u2_fast();
1848 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1849 runtime_visible_annotations_length = method_attribute_length;
1850 runtime_visible_annotations = cfs->get_u1_buffer();
1851 assert(runtime_visible_annotations != NULL, "null visible annotations");
1852 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1853 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1854 runtime_invisible_annotations_length = method_attribute_length;
1855 runtime_invisible_annotations = cfs->get_u1_buffer();
1856 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1857 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1858 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1859 runtime_visible_parameter_annotations_length = method_attribute_length;
1860 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1861 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1862 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1863 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1864 runtime_invisible_parameter_annotations_length = method_attribute_length;
1865 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1866 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1867 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1868 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1869 annotation_default_length = method_attribute_length;
1870 annotation_default = cfs->get_u1_buffer();
1871 assert(annotation_default != NULL, "null annotation default");
1872 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1873 } else {
1874 // Skip unknown attributes
1875 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1876 }
1877 } else {
1878 // Skip unknown attributes
1879 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1880 }
1881 }
1882
1883 if (linenumber_table != NULL) {
1884 linenumber_table->write_terminator();
1885 linenumber_table_length = linenumber_table->position();
1886 }
1887
1888 // Make sure there's at least one Code attribute in non-native/non-abstract method
1889 if (_need_verify) {
1890 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1891 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1892 }
1893
1894 // All sizing information for a methodOop is finally available, now create it
1895 methodOop m_oop = oopFactory::new_method(
1896 code_length, access_flags, linenumber_table_length,
1897 total_lvt_length, checked_exceptions_length,
1898 methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1899 methodHandle m (THREAD, m_oop);
1900
1901 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1902
1903 // Fill in information from fixed part (access_flags already set)
1904 m->set_constants(cp());
1905 m->set_name_index(name_index);
1906 m->set_signature_index(signature_index);
1907 m->set_generic_signature_index(generic_signature_index);
1908 #ifdef CC_INTERP
1909 // hmm is there a gc issue here??
1910 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1911 m->set_result_index(rtf.type());
1912 #endif
1913
1914 if (args_size >= 0) {
1915 m->set_size_of_parameters(args_size);
1916 } else {
1917 m->compute_size_of_parameters(THREAD);
1918 }
1919 #ifdef ASSERT
1920 if (args_size >= 0) {
1921 m->compute_size_of_parameters(THREAD);
1922 assert(args_size == m->size_of_parameters(), "");
1923 }
1924 #endif
1925
1926 // Fill in code attribute information
1927 m->set_max_stack(max_stack);
1928 m->set_max_locals(max_locals);
1929 m->constMethod()->set_stackmap_data(stackmap_data());
1930
1931 /**
1932 * The exception_table field is the flag used to indicate
1933 * that the methodOop and it's associated constMethodOop are partially
1934 * initialized and thus are exempt from pre/post GC verification. Once
1935 * the field is set, the oops are considered fully initialized so make
1936 * sure that the oops can pass verification when this field is set.
1937 */
1938 m->set_exception_table(exception_handlers());
1939
1940 // Copy byte codes
1941 m->set_code(code_start);
1942
1943 // Copy line number table
1944 if (linenumber_table != NULL) {
1945 memcpy(m->compressed_linenumber_table(),
1946 linenumber_table->buffer(), linenumber_table_length);
1947 }
1948
1949 // Copy checked exceptions
1950 if (checked_exceptions_length > 0) {
1951 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1952 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1953 }
1954
1955 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1956 *
1957 * Rules for LVT's and LVTT's are:
1958 * - There can be any number of LVT's and LVTT's.
1959 * - If there are n LVT's, it is the same as if there was just
1960 * one LVT containing all the entries from the n LVT's.
1961 * - There may be no more than one LVT entry per local variable.
1962 * Two LVT entries are 'equal' if these fields are the same:
1963 * start_pc, length, name, slot
1964 * - There may be no more than one LVTT entry per each LVT entry.
1965 * Each LVTT entry has to match some LVT entry.
1966 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1967 */
1968 if (total_lvt_length > 0) {
1969 int tbl_no, idx;
1970
1971 promoted_flags->set_has_localvariable_table();
1972
1973 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1974 initialize_hashtable(lvt_Hash);
1975
1976 // To fill LocalVariableTable in
1977 Classfile_LVT_Element* cf_lvt;
1978 LocalVariableTableElement* lvt = m->localvariable_table_start();
1979
1980 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1981 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1982 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1983 copy_lvt_element(&cf_lvt[idx], lvt);
1984 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1985 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1986 && _need_verify
1987 && _major_version >= JAVA_1_5_VERSION ) {
1988 clear_hashtable(lvt_Hash);
1989 classfile_parse_error("Duplicated LocalVariableTable attribute "
1990 "entry for '%s' in class file %s",
1991 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1992 CHECK_(nullHandle));
1993 }
1994 }
1995 }
1996
1997 // To merge LocalVariableTable and LocalVariableTypeTable
1998 Classfile_LVT_Element* cf_lvtt;
1999 LocalVariableTableElement lvtt_elem;
2000
2001 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2002 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2003 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2004 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2005 int index = hash(&lvtt_elem);
2006 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2007 if (entry == NULL) {
2008 if (_need_verify) {
2009 clear_hashtable(lvt_Hash);
2010 classfile_parse_error("LVTT entry for '%s' in class file %s "
2011 "does not match any LVT entry",
2012 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2013 CHECK_(nullHandle));
2014 }
2015 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2016 clear_hashtable(lvt_Hash);
2017 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2018 "entry for '%s' in class file %s",
2019 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2020 CHECK_(nullHandle));
2021 } else {
2022 // to add generic signatures into LocalVariableTable
2023 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2024 }
2025 }
2026 }
2027 clear_hashtable(lvt_Hash);
2028 }
2029
2030 *method_annotations = assemble_annotations(runtime_visible_annotations,
2031 runtime_visible_annotations_length,
2032 runtime_invisible_annotations,
2033 runtime_invisible_annotations_length,
2034 CHECK_(nullHandle));
2035 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2036 runtime_visible_parameter_annotations_length,
2037 runtime_invisible_parameter_annotations,
2038 runtime_invisible_parameter_annotations_length,
2039 CHECK_(nullHandle));
2040 *method_default_annotations = assemble_annotations(annotation_default,
2041 annotation_default_length,
2042 NULL,
2043 0,
2044 CHECK_(nullHandle));
2045
2046 if (name() == vmSymbols::finalize_method_name() &&
2047 signature() == vmSymbols::void_method_signature()) {
2048 if (m->is_empty_method()) {
2049 _has_empty_finalizer = true;
2050 } else {
2051 _has_finalizer = true;
2052 }
2053 }
2054 if (name() == vmSymbols::object_initializer_name() &&
2055 signature() == vmSymbols::void_method_signature() &&
2056 m->is_vanilla_constructor()) {
2057 _has_vanilla_constructor = true;
2058 }
2059
2060 if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2061 m->is_method_handle_adapter())) {
2062 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2063 "Method handle invokers must be defined internally to the VM", nullHandle);
2064 }
2065
2066 return m;
2067 }
2068
2069
2070 // The promoted_flags parameter is used to pass relevant access_flags
2071 // from the methods back up to the containing klass. These flag values
2072 // are added to klass's access_flags.
2073
2074 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2075 AccessFlags* promoted_flags,
2076 bool* has_final_method,
2077 objArrayOop* methods_annotations_oop,
2078 objArrayOop* methods_parameter_annotations_oop,
2079 objArrayOop* methods_default_annotations_oop,
2080 TRAPS) {
2081 ClassFileStream* cfs = stream();
2082 objArrayHandle nullHandle;
2083 typeArrayHandle method_annotations;
2084 typeArrayHandle method_parameter_annotations;
2085 typeArrayHandle method_default_annotations;
2086 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2087 u2 length = cfs->get_u2_fast();
2088 if (length == 0) {
2089 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2090 } else {
2091 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2092 objArrayHandle methods(THREAD, m);
2093 HandleMark hm(THREAD);
2094 objArrayHandle methods_annotations;
2095 objArrayHandle methods_parameter_annotations;
2096 objArrayHandle methods_default_annotations;
2097 for (int index = 0; index < length; index++) {
2098 methodHandle method = parse_method(cp, is_interface,
2099 promoted_flags,
2100 &method_annotations,
2101 &method_parameter_annotations,
2102 &method_default_annotations,
2103 CHECK_(nullHandle));
2104 if (method->is_final()) {
2105 *has_final_method = true;
2106 }
2107 methods->obj_at_put(index, method());
2108 if (method_annotations.not_null()) {
2109 if (methods_annotations.is_null()) {
2110 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2111 methods_annotations = objArrayHandle(THREAD, md);
2112 }
2113 methods_annotations->obj_at_put(index, method_annotations());
2114 }
2115 if (method_parameter_annotations.not_null()) {
2116 if (methods_parameter_annotations.is_null()) {
2117 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2118 methods_parameter_annotations = objArrayHandle(THREAD, md);
2119 }
2120 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2121 }
2122 if (method_default_annotations.not_null()) {
2123 if (methods_default_annotations.is_null()) {
2124 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2125 methods_default_annotations = objArrayHandle(THREAD, md);
2126 }
2127 methods_default_annotations->obj_at_put(index, method_default_annotations());
2128 }
2129 }
2130 if (_need_verify && length > 1) {
2131 // Check duplicated methods
2132 ResourceMark rm(THREAD);
2133 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2134 THREAD, NameSigHash*, HASH_ROW_SIZE);
2135 initialize_hashtable(names_and_sigs);
2136 bool dup = false;
2137 {
2138 debug_only(No_Safepoint_Verifier nsv;)
2139 for (int i = 0; i < length; i++) {
2140 methodOop m = (methodOop)methods->obj_at(i);
2141 // If no duplicates, add name/signature in hashtable names_and_sigs.
2142 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2143 dup = true;
2144 break;
2145 }
2146 }
2147 }
2148 if (dup) {
2149 classfile_parse_error("Duplicate method name&signature in class file %s",
2150 CHECK_(nullHandle));
2151 }
2152 }
2153
2154 *methods_annotations_oop = methods_annotations();
2155 *methods_parameter_annotations_oop = methods_parameter_annotations();
2156 *methods_default_annotations_oop = methods_default_annotations();
2157
2158 return methods;
2159 }
2160 }
2161
2162
2163 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2164 objArrayHandle methods_annotations,
2165 objArrayHandle methods_parameter_annotations,
2166 objArrayHandle methods_default_annotations,
2167 TRAPS) {
2168 typeArrayHandle nullHandle;
2169 int length = methods()->length();
2170 // If JVMTI original method ordering is enabled we have to
2171 // remember the original class file ordering.
2172 // We temporarily use the vtable_index field in the methodOop to store the
2173 // class file index, so we can read in after calling qsort.
2174 if (JvmtiExport::can_maintain_original_method_order()) {
2175 for (int index = 0; index < length; index++) {
2176 methodOop m = methodOop(methods->obj_at(index));
2177 assert(!m->valid_vtable_index(), "vtable index should not be set");
2178 m->set_vtable_index(index);
2179 }
2180 }
2181 // Sort method array by ascending method name (for faster lookups & vtable construction)
2182 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
2183 methodOopDesc::sort_methods(methods(),
2184 methods_annotations(),
2185 methods_parameter_annotations(),
2186 methods_default_annotations());
2187
2188 // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2189 if (JvmtiExport::can_maintain_original_method_order()) {
2190 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2191 typeArrayHandle method_ordering(THREAD, new_ordering);
2192 for (int index = 0; index < length; index++) {
2193 methodOop m = methodOop(methods->obj_at(index));
2194 int old_index = m->vtable_index();
2195 assert(old_index >= 0 && old_index < length, "invalid method index");
2196 method_ordering->int_at_put(index, old_index);
2197 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2198 }
2199 return method_ordering;
2200 } else {
2201 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2202 }
2203 }
2204
2205
2206 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2207 ClassFileStream* cfs = stream();
2208 cfs->guarantee_more(2, CHECK); // sourcefile_index
2209 u2 sourcefile_index = cfs->get_u2_fast();
2210 check_property(
2211 valid_cp_range(sourcefile_index, cp->length()) &&
2212 cp->tag_at(sourcefile_index).is_utf8(),
2213 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2214 sourcefile_index, CHECK);
2215 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2216 }
2217
2218
2219
2220 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2221 instanceKlassHandle k,
2222 int length, TRAPS) {
2223 ClassFileStream* cfs = stream();
2224 u1* sde_buffer = cfs->get_u1_buffer();
2225 assert(sde_buffer != NULL, "null sde buffer");
2226
2227 // Don't bother storing it if there is no way to retrieve it
2228 if (JvmtiExport::can_get_source_debug_extension()) {
2229 // Optimistically assume that only 1 byte UTF format is used
2230 // (common case)
2231 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2232 length, CHECK);
2233 k->set_source_debug_extension(sde_symbol);
2234 }
2235 // Got utf8 string, set stream position forward
2236 cfs->skip_u1(length, CHECK);
2237 }
2238
2239
2240 // Inner classes can be static, private or protected (classic VM does this)
2241 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2242
2243 // Return number of classes in the inner classes attribute table
2244 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2245 ClassFileStream* cfs = stream();
2246 cfs->guarantee_more(2, CHECK_0); // length
2247 u2 length = cfs->get_u2_fast();
2248
2249 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2250 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2251 typeArrayHandle inner_classes(THREAD, ic);
2252 int index = 0;
2253 int cp_size = cp->length();
2254 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2255 for (int n = 0; n < length; n++) {
2256 // Inner class index
2257 u2 inner_class_info_index = cfs->get_u2_fast();
2258 check_property(
2259 inner_class_info_index == 0 ||
2260 (valid_cp_range(inner_class_info_index, cp_size) &&
2261 is_klass_reference(cp, inner_class_info_index)),
2262 "inner_class_info_index %u has bad constant type in class file %s",
2263 inner_class_info_index, CHECK_0);
2264 // Outer class index
2265 u2 outer_class_info_index = cfs->get_u2_fast();
2266 check_property(
2267 outer_class_info_index == 0 ||
2268 (valid_cp_range(outer_class_info_index, cp_size) &&
2269 is_klass_reference(cp, outer_class_info_index)),
2270 "outer_class_info_index %u has bad constant type in class file %s",
2271 outer_class_info_index, CHECK_0);
2272 // Inner class name
2273 u2 inner_name_index = cfs->get_u2_fast();
2274 check_property(
2275 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2276 cp->tag_at(inner_name_index).is_utf8()),
2277 "inner_name_index %u has bad constant type in class file %s",
2278 inner_name_index, CHECK_0);
2279 if (_need_verify) {
2280 guarantee_property(inner_class_info_index != outer_class_info_index,
2281 "Class is both outer and inner class in class file %s", CHECK_0);
2282 }
2283 // Access flags
2284 AccessFlags inner_access_flags;
2285 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2286 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2287 // Set abstract bit for old class files for backward compatibility
2288 flags |= JVM_ACC_ABSTRACT;
2289 }
2290 verify_legal_class_modifiers(flags, CHECK_0);
2291 inner_access_flags.set_flags(flags);
2292
2293 inner_classes->short_at_put(index++, inner_class_info_index);
2294 inner_classes->short_at_put(index++, outer_class_info_index);
2295 inner_classes->short_at_put(index++, inner_name_index);
2296 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2297 }
2298
2299 // 4347400: make sure there's no duplicate entry in the classes array
2300 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2301 for(int i = 0; i < inner_classes->length(); i += 4) {
2302 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2303 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2304 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2305 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2306 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2307 "Duplicate entry in InnerClasses in class file %s",
2308 CHECK_0);
2309 }
2310 }
2311 }
2312
2313 // Update instanceKlass with inner class info.
2314 k->set_inner_classes(inner_classes());
2315 return length;
2316 }
2317
2318 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2319 k->set_is_synthetic();
2320 }
2321
2322 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2323 ClassFileStream* cfs = stream();
2324 u2 signature_index = cfs->get_u2(CHECK);
2325 check_property(
2326 valid_cp_range(signature_index, cp->length()) &&
2327 cp->tag_at(signature_index).is_utf8(),
2328 "Invalid constant pool index %u in Signature attribute in class file %s",
2329 signature_index, CHECK);
2330 k->set_generic_signature(cp->symbol_at(signature_index));
2331 }
2332
2333 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2334 ClassFileStream* cfs = stream();
2335 // Set inner classes attribute to default sentinel
2336 k->set_inner_classes(Universe::the_empty_short_array());
2337 cfs->guarantee_more(2, CHECK); // attributes_count
2338 u2 attributes_count = cfs->get_u2_fast();
2339 bool parsed_sourcefile_attribute = false;
2340 bool parsed_innerclasses_attribute = false;
2341 bool parsed_enclosingmethod_attribute = false;
2342 u1* runtime_visible_annotations = NULL;
2343 int runtime_visible_annotations_length = 0;
2344 u1* runtime_invisible_annotations = NULL;
2345 int runtime_invisible_annotations_length = 0;
2346 // Iterate over attributes
2347 while (attributes_count--) {
2348 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2349 u2 attribute_name_index = cfs->get_u2_fast();
2350 u4 attribute_length = cfs->get_u4_fast();
2351 check_property(
2352 valid_cp_range(attribute_name_index, cp->length()) &&
2353 cp->tag_at(attribute_name_index).is_utf8(),
2354 "Attribute name has bad constant pool index %u in class file %s",
2355 attribute_name_index, CHECK);
2356 symbolOop tag = cp->symbol_at(attribute_name_index);
2357 if (tag == vmSymbols::tag_source_file()) {
2358 // Check for SourceFile tag
2359 if (_need_verify) {
2360 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2361 }
2362 if (parsed_sourcefile_attribute) {
2363 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2364 } else {
2365 parsed_sourcefile_attribute = true;
2366 }
2367 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2368 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2369 // Check for SourceDebugExtension tag
2370 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2371 } else if (tag == vmSymbols::tag_inner_classes()) {
2372 // Check for InnerClasses tag
2373 if (parsed_innerclasses_attribute) {
2374 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2375 } else {
2376 parsed_innerclasses_attribute = true;
2377 }
2378 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2379 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2380 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2381 "Wrong InnerClasses attribute length in class file %s", CHECK);
2382 }
2383 } else if (tag == vmSymbols::tag_synthetic()) {
2384 // Check for Synthetic tag
2385 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2386 if (attribute_length != 0) {
2387 classfile_parse_error(
2388 "Invalid Synthetic classfile attribute length %u in class file %s",
2389 attribute_length, CHECK);
2390 }
2391 parse_classfile_synthetic_attribute(cp, k, CHECK);
2392 } else if (tag == vmSymbols::tag_deprecated()) {
2393 // Check for Deprecatd tag - 4276120
2394 if (attribute_length != 0) {
2395 classfile_parse_error(
2396 "Invalid Deprecated classfile attribute length %u in class file %s",
2397 attribute_length, CHECK);
2398 }
2399 } else if (_major_version >= JAVA_1_5_VERSION) {
2400 if (tag == vmSymbols::tag_signature()) {
2401 if (attribute_length != 2) {
2402 classfile_parse_error(
2403 "Wrong Signature attribute length %u in class file %s",
2404 attribute_length, CHECK);
2405 }
2406 parse_classfile_signature_attribute(cp, k, CHECK);
2407 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2408 runtime_visible_annotations_length = attribute_length;
2409 runtime_visible_annotations = cfs->get_u1_buffer();
2410 assert(runtime_visible_annotations != NULL, "null visible annotations");
2411 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2412 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2413 runtime_invisible_annotations_length = attribute_length;
2414 runtime_invisible_annotations = cfs->get_u1_buffer();
2415 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2416 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2417 } else if (tag == vmSymbols::tag_enclosing_method()) {
2418 if (parsed_enclosingmethod_attribute) {
2419 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2420 } else {
2421 parsed_enclosingmethod_attribute = true;
2422 }
2423 cfs->guarantee_more(4, CHECK); // class_index, method_index
2424 u2 class_index = cfs->get_u2_fast();
2425 u2 method_index = cfs->get_u2_fast();
2426 if (class_index == 0) {
2427 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2428 }
2429 // Validate the constant pool indices and types
2430 if (!cp->is_within_bounds(class_index) ||
2431 !is_klass_reference(cp, class_index)) {
2432 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2433 }
2434 if (method_index != 0 &&
2435 (!cp->is_within_bounds(method_index) ||
2436 !cp->tag_at(method_index).is_name_and_type())) {
2437 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2438 }
2439 k->set_enclosing_method_indices(class_index, method_index);
2440 } else {
2441 // Unknown attribute
2442 cfs->skip_u1(attribute_length, CHECK);
2443 }
2444 } else {
2445 // Unknown attribute
2446 cfs->skip_u1(attribute_length, CHECK);
2447 }
2448 }
2449 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2450 runtime_visible_annotations_length,
2451 runtime_invisible_annotations,
2452 runtime_invisible_annotations_length,
2453 CHECK);
2454 k->set_class_annotations(annotations());
2455 }
2456
2457
2458 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2459 int runtime_visible_annotations_length,
2460 u1* runtime_invisible_annotations,
2461 int runtime_invisible_annotations_length, TRAPS) {
2462 typeArrayHandle annotations;
2463 if (runtime_visible_annotations != NULL ||
2464 runtime_invisible_annotations != NULL) {
2465 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2466 runtime_invisible_annotations_length, CHECK_(annotations));
2467 annotations = typeArrayHandle(THREAD, anno);
2468 if (runtime_visible_annotations != NULL) {
2469 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2470 }
2471 if (runtime_invisible_annotations != NULL) {
2472 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2473 }
2474 }
2475 return annotations;
2476 }
2477
2478
2479 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2480 KlassHandle h_k (THREAD, fd->field_holder());
2481 assert(h_k.not_null() && fd->is_static(), "just checking");
2482 if (fd->has_initial_value()) {
2483 BasicType t = fd->field_type();
2484 switch (t) {
2485 case T_BYTE:
2486 h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2487 break;
2488 case T_BOOLEAN:
2489 h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2490 break;
2491 case T_CHAR:
2492 h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2493 break;
2494 case T_SHORT:
2495 h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2496 break;
2497 case T_INT:
2498 h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2499 break;
2500 case T_FLOAT:
2501 h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2502 break;
2503 case T_DOUBLE:
2504 h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2505 break;
2506 case T_LONG:
2507 h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2508 break;
2509 case T_OBJECT:
2510 {
2511 #ifdef ASSERT
2512 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2513 assert(fd->signature() == sym, "just checking");
2514 #endif
2515 oop string = fd->string_initial_value(CHECK);
2516 h_k()->obj_field_put(fd->offset(), string);
2517 }
2518 break;
2519 default:
2520 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2521 "Illegal ConstantValue attribute in class file");
2522 }
2523 }
2524 }
2525
2526
2527 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2528 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2529 // This code is for compatibility with earlier jdk's that do not
2530 // have the "discovered" field in java.lang.ref.Reference. For 1.5
2531 // the check for the "discovered" field should issue a warning if
2532 // the field is not found. For 1.6 this code should be issue a
2533 // fatal error if the "discovered" field is not found.
2534 //
2535 // Increment fac.nonstatic_oop_count so that the start of the
2536 // next type of non-static oops leaves room for the fake oop.
2537 // Do not increment next_nonstatic_oop_offset so that the
2538 // fake oop is place after the java.lang.ref.Reference oop
2539 // fields.
2540 //
2541 // Check the fields in java.lang.ref.Reference for the "discovered"
2542 // field. If it is not present, artifically create a field for it.
2543 // This allows this VM to run on early JDK where the field is not
2544 // present.
2545
2546 //
2547 // Increment fac.nonstatic_oop_count so that the start of the
2548 // next type of non-static oops leaves room for the fake oop.
2549 // Do not increment next_nonstatic_oop_offset so that the
2550 // fake oop is place after the java.lang.ref.Reference oop
2551 // fields.
2552 //
2553 // Check the fields in java.lang.ref.Reference for the "discovered"
2554 // field. If it is not present, artifically create a field for it.
2555 // This allows this VM to run on early JDK where the field is not
2556 // present.
2557 int reference_sig_index = 0;
2558 int reference_name_index = 0;
2559 int reference_index = 0;
2560 int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2561 const int n = (*fields_ptr)()->length();
2562 for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2563 int name_index =
2564 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2565 int sig_index =
2566 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2567 symbolOop f_name = cp->symbol_at(name_index);
2568 symbolOop f_sig = cp->symbol_at(sig_index);
2569 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2570 // Save the index for reference signature for later use.
2571 // The fake discovered field does not entries in the
2572 // constant pool so the index for its signature cannot
2573 // be extracted from the constant pool. It will need
2574 // later, however. It's signature is vmSymbols::reference_signature()
2575 // so same an index for that signature.
2576 reference_sig_index = sig_index;
2577 reference_name_index = name_index;
2578 reference_index = i;
2579 }
2580 if (f_name == vmSymbols::reference_discovered_name() &&
2581 f_sig == vmSymbols::reference_signature()) {
2582 // The values below are fake but will force extra
2583 // non-static oop fields and a corresponding non-static
2584 // oop map block to be allocated.
2585 extra = 0;
2586 break;
2587 }
2588 }
2589 if (extra != 0) {
2590 fac_ptr->nonstatic_oop_count += extra;
2591 // Add the additional entry to "fields" so that the klass
2592 // contains the "discoverd" field and the field will be initialized
2593 // in instances of the object.
2594 int fields_with_fix_length = (*fields_ptr)()->length() +
2595 instanceKlass::next_offset;
2596 typeArrayOop ff = oopFactory::new_permanent_shortArray(
2597 fields_with_fix_length, CHECK);
2598 typeArrayHandle fields_with_fix(THREAD, ff);
2599
2600 // Take everything from the original but the length.
2601 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2602 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2603 }
2604
2605 // Add the fake field at the end.
2606 int i = (*fields_ptr)->length();
2607 // There is no name index for the fake "discovered" field nor
2608 // signature but a signature is needed so that the field will
2609 // be properly initialized. Use one found for
2610 // one of the other reference fields. Be sure the index for the
2611 // name is 0. In fieldDescriptor::initialize() the index of the
2612 // name is checked. That check is by passed for the last nonstatic
2613 // oop field in a java.lang.ref.Reference which is assumed to be
2614 // this artificial "discovered" field. An assertion checks that
2615 // the name index is 0.
2616 assert(reference_index != 0, "Missing signature for reference");
2617
2618 int j;
2619 for (j = 0; j < instanceKlass::next_offset; j++) {
2620 fields_with_fix->ushort_at_put(i + j,
2621 (*fields_ptr)->ushort_at(reference_index +j));
2622 }
2623 // Clear the public access flag and set the private access flag.
2624 short flags;
2625 flags =
2626 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2627 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2628 flags = flags & (~JVM_ACC_PUBLIC);
2629 flags = flags | JVM_ACC_PRIVATE;
2630 AccessFlags access_flags;
2631 access_flags.set_flags(flags);
2632 assert(!access_flags.is_public(), "Failed to clear public flag");
2633 assert(access_flags.is_private(), "Failed to set private flag");
2634 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2635 flags);
2636
2637 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2638 == reference_name_index, "The fake reference name is incorrect");
2639 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2640 == reference_sig_index, "The fake reference signature is incorrect");
2641 // The type of the field is stored in the low_offset entry during
2642 // parsing.
2643 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2644 NONSTATIC_OOP, "The fake reference type is incorrect");
2645
2646 // "fields" is allocated in the permanent generation. Disgard
2647 // it and let it be collected.
2648 (*fields_ptr) = fields_with_fix;
2649 }
2650 return;
2651 }
2652
2653
2654 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2655 FieldAllocationCount *fac_ptr, TRAPS) {
2656 // Add fake fields for java.lang.Class instances
2657 //
2658 // This is not particularly nice. We should consider adding a
2659 // private transient object field at the Java level to
2660 // java.lang.Class. Alternatively we could add a subclass of
2661 // instanceKlass which provides an accessor and size computer for
2662 // this field, but that appears to be more code than this hack.
2663 //
2664 // NOTE that we wedge these in at the beginning rather than the
2665 // end of the object because the Class layout changed between JDK
2666 // 1.3 and JDK 1.4 with the new reflection implementation; some
2667 // nonstatic oop fields were added at the Java level. The offsets
2668 // of these fake fields can't change between these two JDK
2669 // versions because when the offsets are computed at bootstrap
2670 // time we don't know yet which version of the JDK we're running in.
2671
2672 // The values below are fake but will force two non-static oop fields and
2673 // a corresponding non-static oop map block to be allocated.
2674 const int extra = java_lang_Class::number_of_fake_oop_fields;
2675 fac_ptr->nonstatic_oop_count += extra;
2676 }
2677
2678
2679 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2680 // Cause the extra fake fields in java.lang.Class to show up before
2681 // the Java fields for layout compatibility between 1.3 and 1.4
2682 // Incrementing next_nonstatic_oop_offset here advances the
2683 // location where the real java fields are placed.
2684 const int extra = java_lang_Class::number_of_fake_oop_fields;
2685 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2686 }
2687
2688
2689 // Force MethodHandle.vmentry to be an unmanaged pointer.
2690 // There is no way for a classfile to express this, so we must help it.
2691 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2692 typeArrayHandle* fields_ptr,
2693 FieldAllocationCount *fac_ptr,
2694 TRAPS) {
2695 // Add fake fields for java.dyn.MethodHandle instances
2696 //
2697 // This is not particularly nice, but since there is no way to express
2698 // a native wordSize field in Java, we must do it at this level.
2699
2700 if (!EnableMethodHandles) return;
2701
2702 int word_sig_index = 0;
2703 const int cp_size = cp->length();
2704 for (int index = 1; index < cp_size; index++) {
2705 if (cp->tag_at(index).is_utf8() &&
2706 cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2707 word_sig_index = index;
2708 break;
2709 }
2710 }
2711
2712 if (word_sig_index == 0)
2713 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2714 "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2715
2716 bool found_vmentry = false;
2717
2718 const int n = (*fields_ptr)()->length();
2719 for (int i = 0; i < n; i += instanceKlass::next_offset) {
2720 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2721 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2722 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2723 symbolOop f_name = cp->symbol_at(name_index);
2724 symbolOop f_sig = cp->symbol_at(sig_index);
2725 if (f_sig == vmSymbols::byte_signature() &&
2726 f_name == vmSymbols::vmentry_name() &&
2727 (acc_flags & JVM_ACC_STATIC) == 0) {
2728 // Adjust the field type from byte to an unmanaged pointer.
2729 assert(fac_ptr->nonstatic_byte_count > 0, "");
2730 fac_ptr->nonstatic_byte_count -= 1;
2731
2732 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset, word_sig_index);
2733 assert(wordSize == longSize || wordSize == jintSize, "ILP32 or LP64");
2734 if (wordSize == longSize) fac_ptr->nonstatic_double_count += 1;
2735 else fac_ptr->nonstatic_word_count += 1;
2736
2737 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset);
2738 assert(atype == NONSTATIC_BYTE, "");
2739 FieldAllocationType new_atype = (wordSize == longSize) ? NONSTATIC_DOUBLE : NONSTATIC_WORD;
2740 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2741
2742 found_vmentry = true;
2743 break;
2744 }
2745 }
2746
2747 if (!found_vmentry)
2748 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2749 "missing vmentry byte field in java.dyn.MethodHandle");
2750
2751 }
2752
2753
2754 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2755 Handle class_loader,
2756 Handle protection_domain,
2757 KlassHandle host_klass,
2758 GrowableArray<Handle>* cp_patches,
2759 symbolHandle& parsed_name,
2760 bool verify,
2761 TRAPS) {
2762 // So that JVMTI can cache class file in the state before retransformable agents
2763 // have modified it
2764 unsigned char *cached_class_file_bytes = NULL;
2765 jint cached_class_file_length;
2766
2767 ClassFileStream* cfs = stream();
2768 // Timing
2769 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2770 JavaThread* jt = (JavaThread*) THREAD;
2771
2772 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2773 ClassLoader::perf_class_parse_selftime(),
2774 NULL,
2775 jt->get_thread_stat()->perf_recursion_counts_addr(),
2776 jt->get_thread_stat()->perf_timers_addr(),
2777 PerfClassTraceTime::PARSE_CLASS);
2778
2779 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2780
2781 if (JvmtiExport::should_post_class_file_load_hook()) {
2782 unsigned char* ptr = cfs->buffer();
2783 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2784
2785 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2786 &ptr, &end_ptr,
2787 &cached_class_file_bytes,
2788 &cached_class_file_length);
2789
2790 if (ptr != cfs->buffer()) {
2791 // JVMTI agent has modified class file data.
2792 // Set new class file stream using JVMTI agent modified
2793 // class file data.
2794 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2795 set_stream(cfs);
2796 }
2797 }
2798
2799 _host_klass = host_klass;
2800 _cp_patches = cp_patches;
2801
2802 instanceKlassHandle nullHandle;
2803
2804 // Figure out whether we can skip format checking (matching classic VM behavior)
2805 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2806
2807 // Set the verify flag in stream
2808 cfs->set_verify(_need_verify);
2809
2810 // Save the class file name for easier error message printing.
2811 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2812
2813 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2814 // Magic value
2815 u4 magic = cfs->get_u4_fast();
2816 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2817 "Incompatible magic value %u in class file %s",
2818 magic, CHECK_(nullHandle));
2819
2820 // Version numbers
2821 u2 minor_version = cfs->get_u2_fast();
2822 u2 major_version = cfs->get_u2_fast();
2823
2824 // Check version numbers - we check this even with verifier off
2825 if (!is_supported_version(major_version, minor_version)) {
2826 if (name.is_null()) {
2827 Exceptions::fthrow(
2828 THREAD_AND_LOCATION,
2829 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2830 "Unsupported major.minor version %u.%u",
2831 major_version,
2832 minor_version);
2833 } else {
2834 ResourceMark rm(THREAD);
2835 Exceptions::fthrow(
2836 THREAD_AND_LOCATION,
2837 vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2838 "%s : Unsupported major.minor version %u.%u",
2839 name->as_C_string(),
2840 major_version,
2841 minor_version);
2842 }
2843 return nullHandle;
2844 }
2845
2846 _major_version = major_version;
2847 _minor_version = minor_version;
2848
2849
2850 // Check if verification needs to be relaxed for this class file
2851 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2852 _relax_verify = Verifier::relax_verify_for(class_loader());
2853
2854 // Constant pool
2855 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2856 int cp_size = cp->length();
2857
2858 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2859
2860 // Access flags
2861 AccessFlags access_flags;
2862 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2863
2864 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2865 // Set abstract bit for old class files for backward compatibility
2866 flags |= JVM_ACC_ABSTRACT;
2867 }
2868 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2869 access_flags.set_flags(flags);
2870
2871 // This class and superclass
2872 instanceKlassHandle super_klass;
2873 u2 this_class_index = cfs->get_u2_fast();
2874 check_property(
2875 valid_cp_range(this_class_index, cp_size) &&
2876 cp->tag_at(this_class_index).is_unresolved_klass(),
2877 "Invalid this class index %u in constant pool in class file %s",
2878 this_class_index, CHECK_(nullHandle));
2879
2880 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2881 assert(class_name.not_null(), "class_name can't be null");
2882
2883 // It's important to set parsed_name *before* resolving the super class.
2884 // (it's used for cleanup by the caller if parsing fails)
2885 parsed_name = class_name;
2886
2887 // Update _class_name which could be null previously to be class_name
2888 _class_name = class_name;
2889
2890 // Don't need to check whether this class name is legal or not.
2891 // It has been checked when constant pool is parsed.
2892 // However, make sure it is not an array type.
2893 if (_need_verify) {
2894 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2895 "Bad class name in class file %s",
2896 CHECK_(nullHandle));
2897 }
2898
2899 klassOop preserve_this_klass; // for storing result across HandleMark
2900
2901 // release all handles when parsing is done
2902 { HandleMark hm(THREAD);
2903
2904 // Checks if name in class file matches requested name
2905 if (name.not_null() && class_name() != name()) {
2906 ResourceMark rm(THREAD);
2907 Exceptions::fthrow(
2908 THREAD_AND_LOCATION,
2909 vmSymbolHandles::java_lang_NoClassDefFoundError(),
2910 "%s (wrong name: %s)",
2911 name->as_C_string(),
2912 class_name->as_C_string()
2913 );
2914 return nullHandle;
2915 }
2916
2917 if (TraceClassLoadingPreorder) {
2918 tty->print("[Loading %s", name()->as_klass_external_name());
2919 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2920 tty->print_cr("]");
2921 }
2922
2923 u2 super_class_index = cfs->get_u2_fast();
2924 if (super_class_index == 0) {
2925 check_property(class_name() == vmSymbols::java_lang_Object(),
2926 "Invalid superclass index %u in class file %s",
2927 super_class_index,
2928 CHECK_(nullHandle));
2929 } else {
2930 check_property(valid_cp_range(super_class_index, cp_size) &&
2931 is_klass_reference(cp, super_class_index),
2932 "Invalid superclass index %u in class file %s",
2933 super_class_index,
2934 CHECK_(nullHandle));
2935 // The class name should be legal because it is checked when parsing constant pool.
2936 // However, make sure it is not an array type.
2937 bool is_array = false;
2938 if (cp->tag_at(super_class_index).is_klass()) {
2939 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2940 if (_need_verify)
2941 is_array = super_klass->oop_is_array();
2942 } else if (_need_verify) {
2943 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2944 }
2945 if (_need_verify) {
2946 guarantee_property(!is_array,
2947 "Bad superclass name in class file %s", CHECK_(nullHandle));
2948 }
2949 }
2950
2951 // Interfaces
2952 u2 itfs_len = cfs->get_u2_fast();
2953 objArrayHandle local_interfaces;
2954 if (itfs_len == 0) {
2955 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2956 } else {
2957 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2958 }
2959
2960 // Fields (offsets are filled in later)
2961 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2962 objArrayHandle fields_annotations;
2963 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2964 // Methods
2965 bool has_final_method = false;
2966 AccessFlags promoted_flags;
2967 promoted_flags.set_flags(0);
2968 // These need to be oop pointers because they are allocated lazily
2969 // inside parse_methods inside a nested HandleMark
2970 objArrayOop methods_annotations_oop = NULL;
2971 objArrayOop methods_parameter_annotations_oop = NULL;
2972 objArrayOop methods_default_annotations_oop = NULL;
2973 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2974 &promoted_flags,
2975 &has_final_method,
2976 &methods_annotations_oop,
2977 &methods_parameter_annotations_oop,
2978 &methods_default_annotations_oop,
2979 CHECK_(nullHandle));
2980
2981 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2982 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2983 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2984
2985 // We check super class after class file is parsed and format is checked
2986 if (super_class_index > 0 && super_klass.is_null()) {
2987 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2988 if (access_flags.is_interface()) {
2989 // Before attempting to resolve the superclass, check for class format
2990 // errors not checked yet.
2991 guarantee_property(sk() == vmSymbols::java_lang_Object(),
2992 "Interfaces must have java.lang.Object as superclass in class file %s",
2993 CHECK_(nullHandle));
2994 }
2995 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2996 sk,
2997 class_loader,
2998 protection_domain,
2999 true,
3000 CHECK_(nullHandle));
3001
3002 KlassHandle kh (THREAD, k);
3003 super_klass = instanceKlassHandle(THREAD, kh());
3004 if (LinkWellKnownClasses) // my super class is well known to me
3005 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
3006 }
3007 if (super_klass.not_null()) {
3008 if (super_klass->is_interface()) {
3009 ResourceMark rm(THREAD);
3010 Exceptions::fthrow(
3011 THREAD_AND_LOCATION,
3012 vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
3013 "class %s has interface %s as super class",
3014 class_name->as_klass_external_name(),
3015 super_klass->external_name()
3016 );
3017 return nullHandle;
3018 }
3019 // Make sure super class is not final
3020 if (super_klass->is_final()) {
3021 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3022 }
3023 }
3024
3025 // Compute the transitive list of all unique interfaces implemented by this class
3026 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3027
3028 // sort methods
3029 typeArrayHandle method_ordering = sort_methods(methods,
3030 methods_annotations,
3031 methods_parameter_annotations,
3032 methods_default_annotations,
3033 CHECK_(nullHandle));
3034
3035 // promote flags from parse_methods() to the klass' flags
3036 access_flags.add_promoted_flags(promoted_flags.as_int());
3037
3038 // Size of Java vtable (in words)
3039 int vtable_size = 0;
3040 int itable_size = 0;
3041 int num_miranda_methods = 0;
3042
3043 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3044 num_miranda_methods,
3045 super_klass(),
3046 methods(),
3047 access_flags,
3048 class_loader,
3049 class_name,
3050 local_interfaces(),
3051 CHECK_(nullHandle));
3052
3053 // Size of Java itable (in words)
3054 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3055
3056 // Field size and offset computation
3057 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3058 #ifndef PRODUCT
3059 int orig_nonstatic_field_size = 0;
3060 #endif
3061 int static_field_size = 0;
3062 int next_static_oop_offset;
3063 int next_static_double_offset;
3064 int next_static_word_offset;
3065 int next_static_short_offset;
3066 int next_static_byte_offset;
3067 int next_static_type_offset;
3068 int next_nonstatic_oop_offset;
3069 int next_nonstatic_double_offset;
3070 int next_nonstatic_word_offset;
3071 int next_nonstatic_short_offset;
3072 int next_nonstatic_byte_offset;
3073 int next_nonstatic_type_offset;
3074 int first_nonstatic_oop_offset;
3075 int first_nonstatic_field_offset;
3076 int next_nonstatic_field_offset;
3077
3078 // Calculate the starting byte offsets
3079 next_static_oop_offset = (instanceKlass::header_size() +
3080 align_object_offset(vtable_size) +
3081 align_object_offset(itable_size)) * wordSize;
3082 next_static_double_offset = next_static_oop_offset +
3083 (fac.static_oop_count * heapOopSize);
3084 if ( fac.static_double_count &&
3085 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3086 Universe::field_type_should_be_aligned(T_LONG)) ) {
3087 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3088 }
3089
3090 next_static_word_offset = next_static_double_offset +
3091 (fac.static_double_count * BytesPerLong);
3092 next_static_short_offset = next_static_word_offset +
3093 (fac.static_word_count * BytesPerInt);
3094 next_static_byte_offset = next_static_short_offset +
3095 (fac.static_short_count * BytesPerShort);
3096 next_static_type_offset = align_size_up((next_static_byte_offset +
3097 fac.static_byte_count ), wordSize );
3098 static_field_size = (next_static_type_offset -
3099 next_static_oop_offset) / wordSize;
3100 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3101 nonstatic_field_size * heapOopSize;
3102 next_nonstatic_field_offset = first_nonstatic_field_offset;
3103
3104 // Add fake fields for java.lang.Class instances (also see below)
3105 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3106 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3107 }
3108
3109 // adjust the vmentry field declaration in java.dyn.MethodHandle
3110 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3111 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
3112 }
3113
3114 // Add a fake "discovered" field if it is not present
3115 // for compatibility with earlier jdk's.
3116 if (class_name() == vmSymbols::java_lang_ref_Reference()
3117 && class_loader.is_null()) {
3118 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3119 }
3120 // end of "discovered" field compactibility fix
3121
3122 unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3123 unsigned int nonstatic_word_count = fac.nonstatic_word_count;
3124 unsigned int nonstatic_short_count = fac.nonstatic_short_count;
3125 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count;
3126 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count;
3127
3128 bool super_has_nonstatic_fields =
3129 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3130 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3131 ((nonstatic_double_count + nonstatic_word_count +
3132 nonstatic_short_count + nonstatic_byte_count +
3133 nonstatic_oop_count) != 0);
3134
3135
3136 // Prepare list of oops for oop map generation.
3137 int* nonstatic_oop_offsets;
3138 unsigned int* nonstatic_oop_counts;
3139 unsigned int nonstatic_oop_map_count = 0;
3140
3141 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3142 THREAD, int, nonstatic_oop_count + 1);
3143 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3144 THREAD, unsigned int, nonstatic_oop_count + 1);
3145
3146 // Add fake fields for java.lang.Class instances (also see above).
3147 // FieldsAllocationStyle and CompactFields values will be reset to default.
3148 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3149 java_lang_Class_fix_post(&next_nonstatic_field_offset);
3150 nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3151 const uint fake_oop_count = (next_nonstatic_field_offset -
3152 first_nonstatic_field_offset) / heapOopSize;
3153 nonstatic_oop_counts[0] = fake_oop_count;
3154 nonstatic_oop_map_count = 1;
3155 nonstatic_oop_count -= fake_oop_count;
3156 first_nonstatic_oop_offset = first_nonstatic_field_offset;
3157 } else {
3158 first_nonstatic_oop_offset = 0; // will be set for first oop field
3159 }
3160
3161 #ifndef PRODUCT
3162 if( PrintCompactFieldsSavings ) {
3163 next_nonstatic_double_offset = next_nonstatic_field_offset +
3164 (nonstatic_oop_count * heapOopSize);
3165 if ( nonstatic_double_count > 0 ) {
3166 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3167 }
3168 next_nonstatic_word_offset = next_nonstatic_double_offset +
3169 (nonstatic_double_count * BytesPerLong);
3170 next_nonstatic_short_offset = next_nonstatic_word_offset +
3171 (nonstatic_word_count * BytesPerInt);
3172 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3173 (nonstatic_short_count * BytesPerShort);
3174 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3175 nonstatic_byte_count ), heapOopSize );
3176 orig_nonstatic_field_size = nonstatic_field_size +
3177 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3178 }
3179 #endif
3180 bool compact_fields = CompactFields;
3181 int allocation_style = FieldsAllocationStyle;
3182 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3183 assert(false, "0 <= FieldsAllocationStyle <= 2");
3184 allocation_style = 1; // Optimistic
3185 }
3186
3187 // The next classes have predefined hard-coded fields offsets
3188 // (see in JavaClasses::compute_hard_coded_offsets()).
3189 // Use default fields allocation order for them.
3190 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3191 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
3192 class_name() == vmSymbols::java_lang_Class() ||
3193 class_name() == vmSymbols::java_lang_ClassLoader() ||
3194 class_name() == vmSymbols::java_lang_ref_Reference() ||
3195 class_name() == vmSymbols::java_lang_ref_SoftReference() ||
3196 class_name() == vmSymbols::java_lang_StackTraceElement() ||
3197 class_name() == vmSymbols::java_lang_String() ||
3198 class_name() == vmSymbols::java_lang_Throwable() ||
3199 class_name() == vmSymbols::java_lang_Boolean() ||
3200 class_name() == vmSymbols::java_lang_Character() ||
3201 class_name() == vmSymbols::java_lang_Float() ||
3202 class_name() == vmSymbols::java_lang_Double() ||
3203 class_name() == vmSymbols::java_lang_Byte() ||
3204 class_name() == vmSymbols::java_lang_Short() ||
3205 class_name() == vmSymbols::java_lang_Integer() ||
3206 class_name() == vmSymbols::java_lang_Long())) {
3207 allocation_style = 0; // Allocate oops first
3208 compact_fields = false; // Don't compact fields
3209 }
3210
3211 if( allocation_style == 0 ) {
3212 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3213 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3214 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3215 (nonstatic_oop_count * heapOopSize);
3216 } else if( allocation_style == 1 ) {
3217 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3218 next_nonstatic_double_offset = next_nonstatic_field_offset;
3219 } else if( allocation_style == 2 ) {
3220 // Fields allocation: oops fields in super and sub classes are together.
3221 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3222 super_klass->nonstatic_oop_map_size() > 0 ) {
3223 int map_size = super_klass->nonstatic_oop_map_size();
3224 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3225 OopMapBlock* last_map = first_map + map_size - 1;
3226 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3227 if (next_offset == next_nonstatic_field_offset) {
3228 allocation_style = 0; // allocate oops first
3229 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3230 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3231 (nonstatic_oop_count * heapOopSize);
3232 }
3233 }
3234 if( allocation_style == 2 ) {
3235 allocation_style = 1; // allocate oops last
3236 next_nonstatic_double_offset = next_nonstatic_field_offset;
3237 }
3238 } else {
3239 ShouldNotReachHere();
3240 }
3241
3242 int nonstatic_oop_space_count = 0;
3243 int nonstatic_word_space_count = 0;
3244 int nonstatic_short_space_count = 0;
3245 int nonstatic_byte_space_count = 0;
3246 int nonstatic_oop_space_offset;
3247 int nonstatic_word_space_offset;
3248 int nonstatic_short_space_offset;
3249 int nonstatic_byte_space_offset;
3250
3251 if( nonstatic_double_count > 0 ) {
3252 int offset = next_nonstatic_double_offset;
3253 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3254 if( compact_fields && offset != next_nonstatic_double_offset ) {
3255 // Allocate available fields into the gap before double field.
3256 int length = next_nonstatic_double_offset - offset;
3257 assert(length == BytesPerInt, "");
3258 nonstatic_word_space_offset = offset;
3259 if( nonstatic_word_count > 0 ) {
3260 nonstatic_word_count -= 1;
3261 nonstatic_word_space_count = 1; // Only one will fit
3262 length -= BytesPerInt;
3263 offset += BytesPerInt;
3264 }
3265 nonstatic_short_space_offset = offset;
3266 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3267 nonstatic_short_count -= 1;
3268 nonstatic_short_space_count += 1;
3269 length -= BytesPerShort;
3270 offset += BytesPerShort;
3271 }
3272 nonstatic_byte_space_offset = offset;
3273 while( length > 0 && nonstatic_byte_count > 0 ) {
3274 nonstatic_byte_count -= 1;
3275 nonstatic_byte_space_count += 1;
3276 length -= 1;
3277 }
3278 // Allocate oop field in the gap if there are no other fields for that.
3279 nonstatic_oop_space_offset = offset;
3280 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3281 allocation_style != 0 ) { // when oop fields not first
3282 nonstatic_oop_count -= 1;
3283 nonstatic_oop_space_count = 1; // Only one will fit
3284 length -= heapOopSize;
3285 offset += heapOopSize;
3286 }
3287 }
3288 }
3289
3290 next_nonstatic_word_offset = next_nonstatic_double_offset +
3291 (nonstatic_double_count * BytesPerLong);
3292 next_nonstatic_short_offset = next_nonstatic_word_offset +
3293 (nonstatic_word_count * BytesPerInt);
3294 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3295 (nonstatic_short_count * BytesPerShort);
3296
3297 int notaligned_offset;
3298 if( allocation_style == 0 ) {
3299 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3300 } else { // allocation_style == 1
3301 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3302 if( nonstatic_oop_count > 0 ) {
3303 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3304 }
3305 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3306 }
3307 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3308 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3309 - first_nonstatic_field_offset)/heapOopSize);
3310
3311 // Iterate over fields again and compute correct offsets.
3312 // The field allocation type was temporarily stored in the offset slot.
3313 // oop fields are located before non-oop fields (static and non-static).
3314 int len = fields->length();
3315 for (int i = 0; i < len; i += instanceKlass::next_offset) {
3316 int real_offset;
3317 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3318 switch (atype) {
3319 case STATIC_OOP:
3320 real_offset = next_static_oop_offset;
3321 next_static_oop_offset += heapOopSize;
3322 break;
3323 case STATIC_BYTE:
3324 real_offset = next_static_byte_offset;
3325 next_static_byte_offset += 1;
3326 break;
3327 case STATIC_SHORT:
3328 real_offset = next_static_short_offset;
3329 next_static_short_offset += BytesPerShort;
3330 break;
3331 case STATIC_WORD:
3332 real_offset = next_static_word_offset;
3333 next_static_word_offset += BytesPerInt;
3334 break;
3335 case STATIC_ALIGNED_DOUBLE:
3336 case STATIC_DOUBLE:
3337 real_offset = next_static_double_offset;
3338 next_static_double_offset += BytesPerLong;
3339 break;
3340 case NONSTATIC_OOP:
3341 if( nonstatic_oop_space_count > 0 ) {
3342 real_offset = nonstatic_oop_space_offset;
3343 nonstatic_oop_space_offset += heapOopSize;
3344 nonstatic_oop_space_count -= 1;
3345 } else {
3346 real_offset = next_nonstatic_oop_offset;
3347 next_nonstatic_oop_offset += heapOopSize;
3348 }
3349 // Update oop maps
3350 if( nonstatic_oop_map_count > 0 &&
3351 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3352 real_offset -
3353 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3354 heapOopSize ) {
3355 // Extend current oop map
3356 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3357 } else {
3358 // Create new oop map
3359 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3360 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3361 nonstatic_oop_map_count += 1;
3362 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3363 first_nonstatic_oop_offset = real_offset;
3364 }
3365 }
3366 break;
3367 case NONSTATIC_BYTE:
3368 if( nonstatic_byte_space_count > 0 ) {
3369 real_offset = nonstatic_byte_space_offset;
3370 nonstatic_byte_space_offset += 1;
3371 nonstatic_byte_space_count -= 1;
3372 } else {
3373 real_offset = next_nonstatic_byte_offset;
3374 next_nonstatic_byte_offset += 1;
3375 }
3376 break;
3377 case NONSTATIC_SHORT:
3378 if( nonstatic_short_space_count > 0 ) {
3379 real_offset = nonstatic_short_space_offset;
3380 nonstatic_short_space_offset += BytesPerShort;
3381 nonstatic_short_space_count -= 1;
3382 } else {
3383 real_offset = next_nonstatic_short_offset;
3384 next_nonstatic_short_offset += BytesPerShort;
3385 }
3386 break;
3387 case NONSTATIC_WORD:
3388 if( nonstatic_word_space_count > 0 ) {
3389 real_offset = nonstatic_word_space_offset;
3390 nonstatic_word_space_offset += BytesPerInt;
3391 nonstatic_word_space_count -= 1;
3392 } else {
3393 real_offset = next_nonstatic_word_offset;
3394 next_nonstatic_word_offset += BytesPerInt;
3395 }
3396 break;
3397 case NONSTATIC_ALIGNED_DOUBLE:
3398 case NONSTATIC_DOUBLE:
3399 real_offset = next_nonstatic_double_offset;
3400 next_nonstatic_double_offset += BytesPerLong;
3401 break;
3402 default:
3403 ShouldNotReachHere();
3404 }
3405 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset));
3406 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3407 }
3408
3409 // Size of instances
3410 int instance_size;
3411
3412 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3413 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3414
3415 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3416
3417 // Number of non-static oop map blocks allocated at end of klass.
3418 const unsigned int total_oop_map_count =
3419 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3420 first_nonstatic_oop_offset);
3421
3422 // Compute reference type
3423 ReferenceType rt;
3424 if (super_klass() == NULL) {
3425 rt = REF_NONE;
3426 } else {
3427 rt = super_klass->reference_type();
3428 }
3429
3430 // We can now create the basic klassOop for this klass
3431 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3432 static_field_size,
3433 total_oop_map_count,
3434 rt, CHECK_(nullHandle));
3435 instanceKlassHandle this_klass (THREAD, ik);
3436
3437 assert(this_klass->static_field_size() == static_field_size, "sanity");
3438 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3439 "sanity");
3440
3441 // Fill in information already parsed
3442 this_klass->set_access_flags(access_flags);
3443 this_klass->set_should_verify_class(verify);
3444 jint lh = Klass::instance_layout_helper(instance_size, false);
3445 this_klass->set_layout_helper(lh);
3446 assert(this_klass->oop_is_instance(), "layout is correct");
3447 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3448 // Not yet: supers are done below to support the new subtype-checking fields
3449 //this_klass->set_super(super_klass());
3450 this_klass->set_class_loader(class_loader());
3451 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3452 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3453 this_klass->set_static_oop_field_size(fac.static_oop_count);
3454 cp->set_pool_holder(this_klass());
3455 this_klass->set_constants(cp());
3456 this_klass->set_local_interfaces(local_interfaces());
3457 this_klass->set_fields(fields());
3458 this_klass->set_methods(methods());
3459 if (has_final_method) {
3460 this_klass->set_has_final_method();
3461 }
3462 this_klass->set_method_ordering(method_ordering());
3463 // The instanceKlass::_methods_jmethod_ids cache and the
3464 // instanceKlass::_methods_cached_itable_indices cache are
3465 // both managed on the assumption that the initial cache
3466 // size is equal to the number of methods in the class. If
3467 // that changes, then instanceKlass::idnum_can_increment()
3468 // has to be changed accordingly.
3469 this_klass->set_initial_method_idnum(methods->length());
3470 this_klass->set_name(cp->klass_name_at(this_class_index));
3471 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3472 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3473 this_klass->set_protection_domain(protection_domain());
3474 this_klass->set_fields_annotations(fields_annotations());
3475 this_klass->set_methods_annotations(methods_annotations());
3476 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3477 this_klass->set_methods_default_annotations(methods_default_annotations());
3478
3479 this_klass->set_minor_version(minor_version);
3480 this_klass->set_major_version(major_version);
3481
3482 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3483 // (We used to do this lazily, but now we query it in Rewriter,
3484 // which is eagerly done for every method, so we might as well do it now,
3485 // when everything is fresh in memory.)
3486 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3487 for (int j = 0; j < methods->length(); j++) {
3488 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3489 }
3490 }
3491
3492 if (cached_class_file_bytes != NULL) {
3493 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3494 this_klass->set_cached_class_file(cached_class_file_bytes,
3495 cached_class_file_length);
3496 }
3497
3498 // Miranda methods
3499 if ((num_miranda_methods > 0) ||
3500 // if this class introduced new miranda methods or
3501 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3502 // super class exists and this class inherited miranda methods
3503 ) {
3504 this_klass->set_has_miranda_methods(); // then set a flag
3505 }
3506
3507 // Additional attributes
3508 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3509
3510 // Make sure this is the end of class file stream
3511 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3512
3513 // Initialize static fields
3514 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3515
3516 // VerifyOops believes that once this has been set, the object is completely loaded.
3517 // Compute transitive closure of interfaces this class implements
3518 this_klass->set_transitive_interfaces(transitive_interfaces());
3519
3520 // Fill in information needed to compute superclasses.
3521 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3522
3523 // Initialize itable offset tables
3524 klassItable::setup_itable_offset_table(this_klass);
3525
3526 // Do final class setup
3527 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3528
3529 set_precomputed_flags(this_klass);
3530
3531 // reinitialize modifiers, using the InnerClasses attribute
3532 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3533 this_klass->set_modifier_flags(computed_modifiers);
3534
3535 // check if this class can access its super class
3536 check_super_class_access(this_klass, CHECK_(nullHandle));
3537
3538 // check if this class can access its superinterfaces
3539 check_super_interface_access(this_klass, CHECK_(nullHandle));
3540
3541 // check if this class overrides any final method
3542 check_final_method_override(this_klass, CHECK_(nullHandle));
3543
3544 // check that if this class is an interface then it doesn't have static methods
3545 if (this_klass->is_interface()) {
3546 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3547 }
3548
3549 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3550 false /* not shared class */);
3551
3552 if (TraceClassLoading) {
3553 // print in a single call to reduce interleaving of output
3554 if (cfs->source() != NULL) {
3555 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3556 cfs->source());
3557 } else if (class_loader.is_null()) {
3558 if (THREAD->is_Java_thread()) {
3559 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3560 tty->print("[Loaded %s by instance of %s]\n",
3561 this_klass->external_name(),
3562 instanceKlass::cast(caller)->external_name());
3563 } else {
3564 tty->print("[Loaded %s]\n", this_klass->external_name());
3565 }
3566 } else {
3567 ResourceMark rm;
3568 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3569 instanceKlass::cast(class_loader->klass())->external_name());
3570 }
3571 }
3572
3573 if (TraceClassResolution) {
3574 // print out the superclass.
3575 const char * from = Klass::cast(this_klass())->external_name();
3576 if (this_klass->java_super() != NULL) {
3577 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3578 }
3579 // print out each of the interface classes referred to by this class.
3580 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3581 if (!local_interfaces.is_null()) {
3582 int length = local_interfaces->length();
3583 for (int i = 0; i < length; i++) {
3584 klassOop k = klassOop(local_interfaces->obj_at(i));
3585 instanceKlass* to_class = instanceKlass::cast(k);
3586 const char * to = to_class->external_name();
3587 tty->print("RESOLVE %s %s (interface)\n", from, to);
3588 }
3589 }
3590 }
3591
3592 #ifndef PRODUCT
3593 if( PrintCompactFieldsSavings ) {
3594 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3595 tty->print("[Saved %d of %d bytes in %s]\n",
3596 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3597 orig_nonstatic_field_size*heapOopSize,
3598 this_klass->external_name());
3599 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3600 tty->print("[Wasted %d over %d bytes in %s]\n",
3601 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3602 orig_nonstatic_field_size*heapOopSize,
3603 this_klass->external_name());
3604 }
3605 }
3606 #endif
3607
3608 // preserve result across HandleMark
3609 preserve_this_klass = this_klass();
3610 }
3611
3612 // Create new handle outside HandleMark
3613 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3614 debug_only(this_klass->as_klassOop()->verify();)
3615
3616 return this_klass;
3617 }
3618
3619
3620 unsigned int
3621 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3622 unsigned int nonstatic_oop_map_count,
3623 int first_nonstatic_oop_offset) {
3624 unsigned int map_count =
3625 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3626 if (nonstatic_oop_map_count > 0) {
3627 // We have oops to add to map
3628 if (map_count == 0) {
3629 map_count = nonstatic_oop_map_count;
3630 } else {
3631 // Check whether we should add a new map block or whether the last one can
3632 // be extended
3633 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3634 OopMapBlock* const last_map = first_map + map_count - 1;
3635
3636 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3637 if (next_offset == first_nonstatic_oop_offset) {
3638 // There is no gap bettwen superklass's last oop field and first
3639 // local oop field, merge maps.
3640 nonstatic_oop_map_count -= 1;
3641 } else {
3642 // Superklass didn't end with a oop field, add extra maps
3643 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3644 }
3645 map_count += nonstatic_oop_map_count;
3646 }
3647 }
3648 return map_count;
3649 }
3650
3651
3652 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3653 unsigned int nonstatic_oop_map_count,
3654 int* nonstatic_oop_offsets,
3655 unsigned int* nonstatic_oop_counts) {
3656 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3657 const instanceKlass* const super = k->superklass();
3658 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3659 if (super_count > 0) {
3660 // Copy maps from superklass
3661 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3662 for (unsigned int i = 0; i < super_count; ++i) {
3663 *this_oop_map++ = *super_oop_map++;
3664 }
3665 }
3666
3667 if (nonstatic_oop_map_count > 0) {
3668 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3669 // The counts differ because there is no gap between superklass's last oop
3670 // field and the first local oop field. Extend the last oop map copied
3671 // from the superklass instead of creating new one.
3672 nonstatic_oop_map_count--;
3673 nonstatic_oop_offsets++;
3674 this_oop_map--;
3675 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3676 this_oop_map++;
3677 }
3678
3679 // Add new map blocks, fill them
3680 while (nonstatic_oop_map_count-- > 0) {
3681 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3682 this_oop_map->set_count(*nonstatic_oop_counts++);
3683 this_oop_map++;
3684 }
3685 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3686 this_oop_map, "sanity");
3687 }
3688 }
3689
3690
3691 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3692 klassOop super = k->super();
3693
3694 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3695 // in which case we don't have to register objects as finalizable
3696 if (!_has_empty_finalizer) {
3697 if (_has_finalizer ||
3698 (super != NULL && super->klass_part()->has_finalizer())) {
3699 k->set_has_finalizer();
3700 }
3701 }
3702
3703 #ifdef ASSERT
3704 bool f = false;
3705 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3706 vmSymbols::void_method_signature());
3707 if (m != NULL && !m->is_empty_method()) {
3708 f = true;
3709 }
3710 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3711 #endif
3712
3713 // Check if this klass supports the java.lang.Cloneable interface
3714 if (SystemDictionary::Cloneable_klass_loaded()) {
3715 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3716 k->set_is_cloneable();
3717 }
3718 }
3719
3720 // Check if this klass has a vanilla default constructor
3721 if (super == NULL) {
3722 // java.lang.Object has empty default constructor
3723 k->set_has_vanilla_constructor();
3724 } else {
3725 if (Klass::cast(super)->has_vanilla_constructor() &&
3726 _has_vanilla_constructor) {
3727 k->set_has_vanilla_constructor();
3728 }
3729 #ifdef ASSERT
3730 bool v = false;
3731 if (Klass::cast(super)->has_vanilla_constructor()) {
3732 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3733 ), vmSymbols::void_method_signature());
3734 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3735 v = true;
3736 }
3737 }
3738 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3739 #endif
3740 }
3741
3742 // If it cannot be fast-path allocated, set a bit in the layout helper.
3743 // See documentation of instanceKlass::can_be_fastpath_allocated().
3744 assert(k->size_helper() > 0, "layout_helper is initialized");
3745 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3746 || k->is_abstract() || k->is_interface()
3747 || (k->name() == vmSymbols::java_lang_Class()
3748 && k->class_loader() == NULL)
3749 || k->size_helper() >= FastAllocateSizeLimit) {
3750 // Forbid fast-path allocation.
3751 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3752 k->set_layout_helper(lh);
3753 }
3754 }
3755
3756
3757 // utility method for appending and array with check for duplicates
3758
3759 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3760 // iterate over new interfaces
3761 for (int i = 0; i < ifs->length(); i++) {
3762 oop e = ifs->obj_at(i);
3763 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3764 // check for duplicates
3765 bool duplicate = false;
3766 for (int j = 0; j < index; j++) {
3767 if (result->obj_at(j) == e) {
3768 duplicate = true;
3769 break;
3770 }
3771 }
3772 // add new interface
3773 if (!duplicate) {
3774 result->obj_at_put(index++, e);
3775 }
3776 }
3777 }
3778
3779 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3780 // Compute maximum size for transitive interfaces
3781 int max_transitive_size = 0;
3782 int super_size = 0;
3783 // Add superclass transitive interfaces size
3784 if (super.not_null()) {
3785 super_size = super->transitive_interfaces()->length();
3786 max_transitive_size += super_size;
3787 }
3788 // Add local interfaces' super interfaces
3789 int local_size = local_ifs->length();
3790 for (int i = 0; i < local_size; i++) {
3791 klassOop l = klassOop(local_ifs->obj_at(i));
3792 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3793 }
3794 // Finally add local interfaces
3795 max_transitive_size += local_size;
3796 // Construct array
3797 objArrayHandle result;
3798 if (max_transitive_size == 0) {
3799 // no interfaces, use canonicalized array
3800 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3801 } else if (max_transitive_size == super_size) {
3802 // no new local interfaces added, share superklass' transitive interface array
3803 result = objArrayHandle(THREAD, super->transitive_interfaces());
3804 } else if (max_transitive_size == local_size) {
3805 // only local interfaces added, share local interface array
3806 result = local_ifs;
3807 } else {
3808 objArrayHandle nullHandle;
3809 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3810 result = objArrayHandle(THREAD, new_objarray);
3811 int index = 0;
3812 // Copy down from superclass
3813 if (super.not_null()) {
3814 append_interfaces(result, index, super->transitive_interfaces());
3815 }
3816 // Copy down from local interfaces' superinterfaces
3817 for (int i = 0; i < local_ifs->length(); i++) {
3818 klassOop l = klassOop(local_ifs->obj_at(i));
3819 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3820 }
3821 // Finally add local interfaces
3822 append_interfaces(result, index, local_ifs());
3823
3824 // Check if duplicates were removed
3825 if (index != max_transitive_size) {
3826 assert(index < max_transitive_size, "just checking");
3827 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3828 for (int i = 0; i < index; i++) {
3829 oop e = result->obj_at(i);
3830 assert(e != NULL, "just checking");
3831 new_result->obj_at_put(i, e);
3832 }
3833 result = objArrayHandle(THREAD, new_result);
3834 }
3835 }
3836 return result;
3837 }
3838
3839
3840 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3841 klassOop super = this_klass->super();
3842 if ((super != NULL) &&
3843 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3844 ResourceMark rm(THREAD);
3845 Exceptions::fthrow(
3846 THREAD_AND_LOCATION,
3847 vmSymbolHandles::java_lang_IllegalAccessError(),
3848 "class %s cannot access its superclass %s",
3849 this_klass->external_name(),
3850 instanceKlass::cast(super)->external_name()
3851 );
3852 return;
3853 }
3854 }
3855
3856
3857 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3858 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3859 int lng = local_interfaces->length();
3860 for (int i = lng - 1; i >= 0; i--) {
3861 klassOop k = klassOop(local_interfaces->obj_at(i));
3862 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3863 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3864 ResourceMark rm(THREAD);
3865 Exceptions::fthrow(
3866 THREAD_AND_LOCATION,
3867 vmSymbolHandles::java_lang_IllegalAccessError(),
3868 "class %s cannot access its superinterface %s",
3869 this_klass->external_name(),
3870 instanceKlass::cast(k)->external_name()
3871 );
3872 return;
3873 }
3874 }
3875 }
3876
3877
3878 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3879 objArrayHandle methods (THREAD, this_klass->methods());
3880 int num_methods = methods->length();
3881
3882 // go thru each method and check if it overrides a final method
3883 for (int index = 0; index < num_methods; index++) {
3884 methodOop m = (methodOop)methods->obj_at(index);
3885
3886 // skip private, static and <init> methods
3887 if ((!m->is_private()) &&
3888 (!m->is_static()) &&
3889 (m->name() != vmSymbols::object_initializer_name())) {
3890
3891 symbolOop name = m->name();
3892 symbolOop signature = m->signature();
3893 klassOop k = this_klass->super();
3894 methodOop super_m = NULL;
3895 while (k != NULL) {
3896 // skip supers that don't have final methods.
3897 if (k->klass_part()->has_final_method()) {
3898 // lookup a matching method in the super class hierarchy
3899 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3900 if (super_m == NULL) {
3901 break; // didn't find any match; get out
3902 }
3903
3904 if (super_m->is_final() &&
3905 // matching method in super is final
3906 (Reflection::verify_field_access(this_klass->as_klassOop(),
3907 super_m->method_holder(),
3908 super_m->method_holder(),
3909 super_m->access_flags(), false))
3910 // this class can access super final method and therefore override
3911 ) {
3912 ResourceMark rm(THREAD);
3913 Exceptions::fthrow(
3914 THREAD_AND_LOCATION,
3915 vmSymbolHandles::java_lang_VerifyError(),
3916 "class %s overrides final method %s.%s",
3917 this_klass->external_name(),
3918 name->as_C_string(),
3919 signature->as_C_string()
3920 );
3921 return;
3922 }
3923
3924 // continue to look from super_m's holder's super.
3925 k = instanceKlass::cast(super_m->method_holder())->super();
3926 continue;
3927 }
3928
3929 k = k->klass_part()->super();
3930 }
3931 }
3932 }
3933 }
3934
3935
3936 // assumes that this_klass is an interface
3937 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3938 assert(this_klass->is_interface(), "not an interface");
3939 objArrayHandle methods (THREAD, this_klass->methods());
3940 int num_methods = methods->length();
3941
3942 for (int index = 0; index < num_methods; index++) {
3943 methodOop m = (methodOop)methods->obj_at(index);
3944 // if m is static and not the init method, throw a verify error
3945 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3946 ResourceMark rm(THREAD);
3947 Exceptions::fthrow(
3948 THREAD_AND_LOCATION,
3949 vmSymbolHandles::java_lang_VerifyError(),
3950 "Illegal static method %s in interface %s",
3951 m->name()->as_C_string(),
3952 this_klass->external_name()
3953 );
3954 return;
3955 }
3956 }
3957 }
3958
3959 // utility methods for format checking
3960
3961 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3962 if (!_need_verify) { return; }
3963
3964 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3965 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3966 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3967 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3968 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3969 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3970 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3971
3972 if ((is_abstract && is_final) ||
3973 (is_interface && !is_abstract) ||
3974 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3975 (!is_interface && major_gte_15 && is_annotation)) {
3976 ResourceMark rm(THREAD);
3977 Exceptions::fthrow(
3978 THREAD_AND_LOCATION,
3979 vmSymbolHandles::java_lang_ClassFormatError(),
3980 "Illegal class modifiers in class %s: 0x%X",
3981 _class_name->as_C_string(), flags
3982 );
3983 return;
3984 }
3985 }
3986
3987 bool ClassFileParser::has_illegal_visibility(jint flags) {
3988 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3989 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3990 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3991
3992 return ((is_public && is_protected) ||
3993 (is_public && is_private) ||
3994 (is_protected && is_private));
3995 }
3996
3997 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3998 u2 max_version =
3999 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4000 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4001 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4002 (major <= max_version) &&
4003 ((major != max_version) ||
4004 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4005 }
4006
4007 void ClassFileParser::verify_legal_field_modifiers(
4008 jint flags, bool is_interface, TRAPS) {
4009 if (!_need_verify) { return; }
4010
4011 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4012 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4013 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4014 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4015 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4016 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4017 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4018 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4019 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4020
4021 bool is_illegal = false;
4022
4023 if (is_interface) {
4024 if (!is_public || !is_static || !is_final || is_private ||
4025 is_protected || is_volatile || is_transient ||
4026 (major_gte_15 && is_enum)) {
4027 is_illegal = true;
4028 }
4029 } else { // not interface
4030 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4031 is_illegal = true;
4032 }
4033 }
4034
4035 if (is_illegal) {
4036 ResourceMark rm(THREAD);
4037 Exceptions::fthrow(
4038 THREAD_AND_LOCATION,
4039 vmSymbolHandles::java_lang_ClassFormatError(),
4040 "Illegal field modifiers in class %s: 0x%X",
4041 _class_name->as_C_string(), flags);
4042 return;
4043 }
4044 }
4045
4046 void ClassFileParser::verify_legal_method_modifiers(
4047 jint flags, bool is_interface, symbolHandle name, TRAPS) {
4048 if (!_need_verify) { return; }
4049
4050 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4051 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4052 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4053 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4054 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4055 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4056 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4057 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4058 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4059 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4060 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4061
4062 bool is_illegal = false;
4063
4064 if (is_interface) {
4065 if (!is_abstract || !is_public || is_static || is_final ||
4066 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4067 is_illegal = true;
4068 }
4069 } else { // not interface
4070 if (is_initializer) {
4071 if (is_static || is_final || is_synchronized || is_native ||
4072 is_abstract || (major_gte_15 && is_bridge)) {
4073 is_illegal = true;
4074 }
4075 } else { // not initializer
4076 if (is_abstract) {
4077 if ((is_final || is_native || is_private || is_static ||
4078 (major_gte_15 && (is_synchronized || is_strict)))) {
4079 is_illegal = true;
4080 }
4081 }
4082 if (has_illegal_visibility(flags)) {
4083 is_illegal = true;
4084 }
4085 }
4086 }
4087
4088 if (is_illegal) {
4089 ResourceMark rm(THREAD);
4090 Exceptions::fthrow(
4091 THREAD_AND_LOCATION,
4092 vmSymbolHandles::java_lang_ClassFormatError(),
4093 "Method %s in class %s has illegal modifiers: 0x%X",
4094 name->as_C_string(), _class_name->as_C_string(), flags);
4095 return;
4096 }
4097 }
4098
4099 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4100 assert(_need_verify, "only called when _need_verify is true");
4101 int i = 0;
4102 int count = length >> 2;
4103 for (int k=0; k<count; k++) {
4104 unsigned char b0 = buffer[i];
4105 unsigned char b1 = buffer[i+1];
4106 unsigned char b2 = buffer[i+2];
4107 unsigned char b3 = buffer[i+3];
4108 // For an unsigned char v,
4109 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4110 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4111 unsigned char res = b0 | b0 - 1 |
4112 b1 | b1 - 1 |
4113 b2 | b2 - 1 |
4114 b3 | b3 - 1;
4115 if (res >= 128) break;
4116 i += 4;
4117 }
4118 for(; i < length; i++) {
4119 unsigned short c;
4120 // no embedded zeros
4121 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4122 if(buffer[i] < 128) {
4123 continue;
4124 }
4125 if ((i + 5) < length) { // see if it's legal supplementary character
4126 if (UTF8::is_supplementary_character(&buffer[i])) {
4127 c = UTF8::get_supplementary_character(&buffer[i]);
4128 i += 5;
4129 continue;
4130 }
4131 }
4132 switch (buffer[i] >> 4) {
4133 default: break;
4134 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4135 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4136 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4137 c = (buffer[i] & 0x1F) << 6;
4138 i++;
4139 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4140 c += buffer[i] & 0x3F;
4141 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4142 // for classes with major > 47, c must a null or a character in its shortest form
4143 break;
4144 }
4145 }
4146 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4147 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4148 c = (buffer[i] & 0xF) << 12;
4149 i += 2;
4150 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4151 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4152 if (_major_version <= 47 || c >= 0x800) {
4153 // for classes with major > 47, c must be in its shortest form
4154 break;
4155 }
4156 }
4157 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4158 } // end of switch
4159 } // end of for
4160 }
4161
4162 // Checks if name is a legal class name.
4163 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
4164 if (!_need_verify || _relax_verify) { return; }
4165
4166 char buf[fixed_buffer_size];
4167 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4168 unsigned int length = name->utf8_length();
4169 bool legal = false;
4170
4171 if (length > 0) {
4172 char* p;
4173 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4174 p = skip_over_field_signature(bytes, false, length, CHECK);
4175 legal = (p != NULL) && ((p - bytes) == (int)length);
4176 } else if (_major_version < JAVA_1_5_VERSION) {
4177 if (bytes[0] != '<') {
4178 p = skip_over_field_name(bytes, true, length);
4179 legal = (p != NULL) && ((p - bytes) == (int)length);
4180 }
4181 } else {
4182 // 4900761: relax the constraints based on JSR202 spec
4183 // Class names may be drawn from the entire Unicode character set.
4184 // Identifiers between '/' must be unqualified names.
4185 // The utf8 string has been verified when parsing cpool entries.
4186 legal = verify_unqualified_name(bytes, length, LegalClass);
4187 }
4188 }
4189 if (!legal) {
4190 ResourceMark rm(THREAD);
4191 Exceptions::fthrow(
4192 THREAD_AND_LOCATION,
4193 vmSymbolHandles::java_lang_ClassFormatError(),
4194 "Illegal class name \"%s\" in class file %s", bytes,
4195 _class_name->as_C_string()
4196 );
4197 return;
4198 }
4199 }
4200
4201 // Checks if name is a legal field name.
4202 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
4203 if (!_need_verify || _relax_verify) { return; }
4204
4205 char buf[fixed_buffer_size];
4206 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4207 unsigned int length = name->utf8_length();
4208 bool legal = false;
4209
4210 if (length > 0) {
4211 if (_major_version < JAVA_1_5_VERSION) {
4212 if (bytes[0] != '<') {
4213 char* p = skip_over_field_name(bytes, false, length);
4214 legal = (p != NULL) && ((p - bytes) == (int)length);
4215 }
4216 } else {
4217 // 4881221: relax the constraints based on JSR202 spec
4218 legal = verify_unqualified_name(bytes, length, LegalField);
4219 }
4220 }
4221
4222 if (!legal) {
4223 ResourceMark rm(THREAD);
4224 Exceptions::fthrow(
4225 THREAD_AND_LOCATION,
4226 vmSymbolHandles::java_lang_ClassFormatError(),
4227 "Illegal field name \"%s\" in class %s", bytes,
4228 _class_name->as_C_string()
4229 );
4230 return;
4231 }
4232 }
4233
4234 // Checks if name is a legal method name.
4235 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
4236 if (!_need_verify || _relax_verify) { return; }
4237
4238 assert(!name.is_null(), "method name is null");
4239 char buf[fixed_buffer_size];
4240 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4241 unsigned int length = name->utf8_length();
4242 bool legal = false;
4243
4244 if (length > 0) {
4245 if (bytes[0] == '<') {
4246 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4247 legal = true;
4248 }
4249 } else if (_major_version < JAVA_1_5_VERSION) {
4250 char* p;
4251 p = skip_over_field_name(bytes, false, length);
4252 legal = (p != NULL) && ((p - bytes) == (int)length);
4253 } else {
4254 // 4881221: relax the constraints based on JSR202 spec
4255 legal = verify_unqualified_name(bytes, length, LegalMethod);
4256 }
4257 }
4258
4259 if (!legal) {
4260 ResourceMark rm(THREAD);
4261 Exceptions::fthrow(
4262 THREAD_AND_LOCATION,
4263 vmSymbolHandles::java_lang_ClassFormatError(),
4264 "Illegal method name \"%s\" in class %s", bytes,
4265 _class_name->as_C_string()
4266 );
4267 return;
4268 }
4269 }
4270
4271
4272 // Checks if signature is a legal field signature.
4273 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4274 if (!_need_verify) { return; }
4275
4276 char buf[fixed_buffer_size];
4277 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4278 unsigned int length = signature->utf8_length();
4279 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4280
4281 if (p == NULL || (p - bytes) != (int)length) {
4282 throwIllegalSignature("Field", name, signature, CHECK);
4283 }
4284 }
4285
4286 // Checks if signature is a legal method signature.
4287 // Returns number of parameters
4288 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4289 if (!_need_verify) {
4290 // make sure caller's args_size will be less than 0 even for non-static
4291 // method so it will be recomputed in compute_size_of_parameters().
4292 return -2;
4293 }
4294
4295 unsigned int args_size = 0;
4296 char buf[fixed_buffer_size];
4297 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4298 unsigned int length = signature->utf8_length();
4299 char* nextp;
4300
4301 // The first character must be a '('
4302 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4303 length--;
4304 // Skip over legal field signatures
4305 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4306 while ((length > 0) && (nextp != NULL)) {
4307 args_size++;
4308 if (p[0] == 'J' || p[0] == 'D') {
4309 args_size++;
4310 }
4311 length -= nextp - p;
4312 p = nextp;
4313 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4314 }
4315 // The first non-signature thing better be a ')'
4316 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4317 length--;
4318 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4319 // All internal methods must return void
4320 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4321 return args_size;
4322 }
4323 } else {
4324 // Now we better just have a return value
4325 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4326 if (nextp && ((int)length == (nextp - p))) {
4327 return args_size;
4328 }
4329 }
4330 }
4331 }
4332 // Report error
4333 throwIllegalSignature("Method", name, signature, CHECK_0);
4334 return 0;
4335 }
4336
4337
4338 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4339 // Method names also may not contain the characters '<' or '>', unless <init>
4340 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4341 // method. Because these names have been checked as special cases before
4342 // calling this method in verify_legal_method_name.
4343 bool ClassFileParser::verify_unqualified_name(
4344 char* name, unsigned int length, int type) {
4345 jchar ch;
4346
4347 for (char* p = name; p != name + length; ) {
4348 ch = *p;
4349 if (ch < 128) {
4350 p++;
4351 if (ch == '.' || ch == ';' || ch == '[' ) {
4352 return false; // do not permit '.', ';', or '['
4353 }
4354 if (type != LegalClass && ch == '/') {
4355 return false; // do not permit '/' unless it's class name
4356 }
4357 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4358 return false; // do not permit '<' or '>' in method names
4359 }
4360 } else {
4361 char* tmp_p = UTF8::next(p, &ch);
4362 p = tmp_p;
4363 }
4364 }
4365 return true;
4366 }
4367
4368
4369 // Take pointer to a string. Skip over the longest part of the string that could
4370 // be taken as a fieldname. Allow '/' if slash_ok is true.
4371 // Return a pointer to just past the fieldname.
4372 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4373 // being true, we saw consecutive slashes (meaning we were looking for a
4374 // qualified path but found something that was badly-formed).
4375 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4376 char* p;
4377 jchar ch;
4378 jboolean last_is_slash = false;
4379 jboolean not_first_ch = false;
4380
4381 for (p = name; p != name + length; not_first_ch = true) {
4382 char* old_p = p;
4383 ch = *p;
4384 if (ch < 128) {
4385 p++;
4386 // quick check for ascii
4387 if ((ch >= 'a' && ch <= 'z') ||
4388 (ch >= 'A' && ch <= 'Z') ||
4389 (ch == '_' || ch == '$') ||
4390 (not_first_ch && ch >= '0' && ch <= '9')) {
4391 last_is_slash = false;
4392 continue;
4393 }
4394 if (slash_ok && ch == '/') {
4395 if (last_is_slash) {
4396 return NULL; // Don't permit consecutive slashes
4397 }
4398 last_is_slash = true;
4399 continue;
4400 }
4401 } else {
4402 jint unicode_ch;
4403 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4404 p = tmp_p;
4405 last_is_slash = false;
4406 // Check if ch is Java identifier start or is Java identifier part
4407 // 4672820: call java.lang.Character methods directly without generating separate tables.
4408 EXCEPTION_MARK;
4409 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4410
4411 // return value
4412 JavaValue result(T_BOOLEAN);
4413 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4414 JavaCallArguments args;
4415 args.push_int(unicode_ch);
4416
4417 // public static boolean isJavaIdentifierStart(char ch);
4418 JavaCalls::call_static(&result,
4419 klass,
4420 vmSymbolHandles::isJavaIdentifierStart_name(),
4421 vmSymbolHandles::int_bool_signature(),
4422 &args,
4423 THREAD);
4424
4425 if (HAS_PENDING_EXCEPTION) {
4426 CLEAR_PENDING_EXCEPTION;
4427 return 0;
4428 }
4429 if (result.get_jboolean()) {
4430 continue;
4431 }
4432
4433 if (not_first_ch) {
4434 // public static boolean isJavaIdentifierPart(char ch);
4435 JavaCalls::call_static(&result,
4436 klass,
4437 vmSymbolHandles::isJavaIdentifierPart_name(),
4438 vmSymbolHandles::int_bool_signature(),
4439 &args,
4440 THREAD);
4441
4442 if (HAS_PENDING_EXCEPTION) {
4443 CLEAR_PENDING_EXCEPTION;
4444 return 0;
4445 }
4446
4447 if (result.get_jboolean()) {
4448 continue;
4449 }
4450 }
4451 }
4452 return (not_first_ch) ? old_p : NULL;
4453 }
4454 return (not_first_ch) ? p : NULL;
4455 }
4456
4457
4458 // Take pointer to a string. Skip over the longest part of the string that could
4459 // be taken as a field signature. Allow "void" if void_ok.
4460 // Return a pointer to just past the signature.
4461 // Return NULL if no legal signature is found.
4462 char* ClassFileParser::skip_over_field_signature(char* signature,
4463 bool void_ok,
4464 unsigned int length,
4465 TRAPS) {
4466 unsigned int array_dim = 0;
4467 while (length > 0) {
4468 switch (signature[0]) {
4469 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4470 case JVM_SIGNATURE_BOOLEAN:
4471 case JVM_SIGNATURE_BYTE:
4472 case JVM_SIGNATURE_CHAR:
4473 case JVM_SIGNATURE_SHORT:
4474 case JVM_SIGNATURE_INT:
4475 case JVM_SIGNATURE_FLOAT:
4476 case JVM_SIGNATURE_LONG:
4477 case JVM_SIGNATURE_DOUBLE:
4478 return signature + 1;
4479 case JVM_SIGNATURE_CLASS: {
4480 if (_major_version < JAVA_1_5_VERSION) {
4481 // Skip over the class name if one is there
4482 char* p = skip_over_field_name(signature + 1, true, --length);
4483
4484 // The next character better be a semicolon
4485 if (p && (p - signature) > 1 && p[0] == ';') {
4486 return p + 1;
4487 }
4488 } else {
4489 // 4900761: For class version > 48, any unicode is allowed in class name.
4490 length--;
4491 signature++;
4492 while (length > 0 && signature[0] != ';') {
4493 if (signature[0] == '.') {
4494 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4495 }
4496 length--;
4497 signature++;
4498 }
4499 if (signature[0] == ';') { return signature + 1; }
4500 }
4501
4502 return NULL;
4503 }
4504 case JVM_SIGNATURE_ARRAY:
4505 array_dim++;
4506 if (array_dim > 255) {
4507 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4508 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4509 }
4510 // The rest of what's there better be a legal signature
4511 signature++;
4512 length--;
4513 void_ok = false;
4514 break;
4515
4516 default:
4517 return NULL;
4518 }
4519 }
4520 return NULL;
4521 }