1 /*
2 * Copyright (c) 1997, 2011, 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/fieldStreams.hpp"
40 #include "oops/instanceKlass.hpp"
41 #include "oops/instanceMirrorKlass.hpp"
42 #include "oops/klass.inline.hpp"
43 #include "oops/klassOop.hpp"
44 #include "oops/klassVtable.hpp"
45 #include "oops/methodOop.hpp"
46 #include "oops/symbol.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "prims/jvmtiThreadState.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/perfData.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/timer.hpp"
54 #include "services/classLoadingService.hpp"
55 #include "services/threadService.hpp"
56
57 // We generally try to create the oops directly when parsing, rather than
58 // allocating temporary data structures and copying the bytes twice. A
59 // temporary area is only needed when parsing utf8 entries in the constant
60 // pool and when parsing line number tables.
61
62 // We add assert in debug mode when class format is not checked.
63
64 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
65 #define JAVA_MIN_SUPPORTED_VERSION 45
66 #define JAVA_MAX_SUPPORTED_VERSION 51
67 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
68
69 // Used for two backward compatibility reasons:
70 // - to check for new additions to the class file format in JDK1.5
71 // - to check for bug fixes in the format checker in JDK1.5
72 #define JAVA_1_5_VERSION 49
73
74 // Used for backward compatibility reasons:
75 // - to check for javac bug fixes that happened after 1.5
76 // - also used as the max version when running in jdk6
77 #define JAVA_6_VERSION 50
78
79 // Used for backward compatibility reasons:
80 // - to check NameAndType_info signatures more aggressively
81 #define JAVA_7_VERSION 51
82
83
84 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
85 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
86 // this function (_current can be allocated in a register, with scalar
87 // replacement of aggregates). The _current pointer is copied back to
88 // stream() when this function returns. DON'T call another method within
89 // this method that uses stream().
90 ClassFileStream* cfs0 = stream();
91 ClassFileStream cfs1 = *cfs0;
92 ClassFileStream* cfs = &cfs1;
93 #ifdef ASSERT
94 assert(cfs->allocated_on_stack(),"should be local");
95 u1* old_current = cfs0->current();
96 #endif
97
98 // Used for batching symbol allocations.
99 const char* names[SymbolTable::symbol_alloc_batch_size];
100 int lengths[SymbolTable::symbol_alloc_batch_size];
101 int indices[SymbolTable::symbol_alloc_batch_size];
102 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
103 int names_count = 0;
104
105 // parsing Index 0 is unused
106 for (int index = 1; index < length; index++) {
107 // Each of the following case guarantees one more byte in the stream
108 // for the following tag or the access_flags following constant pool,
109 // so we don't need bounds-check for reading tag.
110 u1 tag = cfs->get_u1_fast();
111 switch (tag) {
112 case JVM_CONSTANT_Class :
113 {
114 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
115 u2 name_index = cfs->get_u2_fast();
116 cp->klass_index_at_put(index, name_index);
117 }
118 break;
119 case JVM_CONSTANT_Fieldref :
120 {
121 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
122 u2 class_index = cfs->get_u2_fast();
123 u2 name_and_type_index = cfs->get_u2_fast();
124 cp->field_at_put(index, class_index, name_and_type_index);
125 }
126 break;
127 case JVM_CONSTANT_Methodref :
128 {
129 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
130 u2 class_index = cfs->get_u2_fast();
131 u2 name_and_type_index = cfs->get_u2_fast();
132 cp->method_at_put(index, class_index, name_and_type_index);
133 }
134 break;
135 case JVM_CONSTANT_InterfaceMethodref :
136 {
137 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
138 u2 class_index = cfs->get_u2_fast();
139 u2 name_and_type_index = cfs->get_u2_fast();
140 cp->interface_method_at_put(index, class_index, name_and_type_index);
141 }
142 break;
143 case JVM_CONSTANT_String :
144 {
145 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
146 u2 string_index = cfs->get_u2_fast();
147 cp->string_index_at_put(index, string_index);
148 }
149 break;
150 case JVM_CONSTANT_MethodHandle :
151 case JVM_CONSTANT_MethodType :
152 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
153 classfile_parse_error(
154 "Class file version does not support constant tag %u in class file %s",
155 tag, CHECK);
156 }
157 if (!EnableInvokeDynamic) {
158 classfile_parse_error(
159 "This JVM does not support constant tag %u in class file %s",
160 tag, CHECK);
161 }
162 if (tag == JVM_CONSTANT_MethodHandle) {
163 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
164 u1 ref_kind = cfs->get_u1_fast();
165 u2 method_index = cfs->get_u2_fast();
166 cp->method_handle_index_at_put(index, ref_kind, method_index);
167 } else if (tag == JVM_CONSTANT_MethodType) {
168 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
169 u2 signature_index = cfs->get_u2_fast();
170 cp->method_type_index_at_put(index, signature_index);
171 } else {
172 ShouldNotReachHere();
173 }
174 break;
175 case JVM_CONSTANT_InvokeDynamic :
176 {
177 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
178 classfile_parse_error(
179 "Class file version does not support constant tag %u in class file %s",
180 tag, CHECK);
181 }
182 if (!EnableInvokeDynamic) {
183 classfile_parse_error(
184 "This JVM does not support constant tag %u in class file %s",
185 tag, CHECK);
186 }
187 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
188 u2 bootstrap_specifier_index = cfs->get_u2_fast();
189 u2 name_and_type_index = cfs->get_u2_fast();
190 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
191 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
192 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
193 }
194 break;
195 case JVM_CONSTANT_Integer :
196 {
197 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
198 u4 bytes = cfs->get_u4_fast();
199 cp->int_at_put(index, (jint) bytes);
200 }
201 break;
202 case JVM_CONSTANT_Float :
203 {
204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
205 u4 bytes = cfs->get_u4_fast();
206 cp->float_at_put(index, *(jfloat*)&bytes);
207 }
208 break;
209 case JVM_CONSTANT_Long :
210 // A mangled type might cause you to overrun allocated memory
211 guarantee_property(index+1 < length,
212 "Invalid constant pool entry %u in class file %s",
213 index, CHECK);
214 {
215 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
216 u8 bytes = cfs->get_u8_fast();
217 cp->long_at_put(index, bytes);
218 }
219 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
220 break;
221 case JVM_CONSTANT_Double :
222 // A mangled type might cause you to overrun allocated memory
223 guarantee_property(index+1 < length,
224 "Invalid constant pool entry %u in class file %s",
225 index, CHECK);
226 {
227 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
228 u8 bytes = cfs->get_u8_fast();
229 cp->double_at_put(index, *(jdouble*)&bytes);
230 }
231 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
232 break;
233 case JVM_CONSTANT_NameAndType :
234 {
235 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
236 u2 name_index = cfs->get_u2_fast();
237 u2 signature_index = cfs->get_u2_fast();
238 cp->name_and_type_at_put(index, name_index, signature_index);
239 }
240 break;
241 case JVM_CONSTANT_Utf8 :
242 {
243 cfs->guarantee_more(2, CHECK); // utf8_length
244 u2 utf8_length = cfs->get_u2_fast();
245 u1* utf8_buffer = cfs->get_u1_buffer();
246 assert(utf8_buffer != NULL, "null utf8 buffer");
247 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
248 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
249 cfs->skip_u1_fast(utf8_length);
250
251 // Before storing the symbol, make sure it's legal
252 if (_need_verify) {
253 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
254 }
255
256 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
257 Handle patch = clear_cp_patch_at(index);
258 guarantee_property(java_lang_String::is_instance(patch()),
259 "Illegal utf8 patch at %d in class file %s",
260 index, CHECK);
261 char* str = java_lang_String::as_utf8_string(patch());
262 // (could use java_lang_String::as_symbol instead, but might as well batch them)
263 utf8_buffer = (u1*) str;
264 utf8_length = (int) strlen(str);
265 }
266
267 unsigned int hash;
268 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
269 if (result == NULL) {
270 names[names_count] = (char*)utf8_buffer;
271 lengths[names_count] = utf8_length;
272 indices[names_count] = index;
273 hashValues[names_count++] = hash;
274 if (names_count == SymbolTable::symbol_alloc_batch_size) {
275 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
276 names_count = 0;
277 }
278 } else {
279 cp->symbol_at_put(index, result);
280 }
281 }
282 break;
283 default:
284 classfile_parse_error(
285 "Unknown constant tag %u in class file %s", tag, CHECK);
286 break;
287 }
288 }
289
290 // Allocate the remaining symbols
291 if (names_count > 0) {
292 SymbolTable::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
293 }
294
295 // Copy _current pointer of local copy back to stream().
296 #ifdef ASSERT
297 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
298 #endif
299 cfs0->set_current(cfs1.current());
300 }
301
302 // This class unreferences constant pool symbols if an error has occurred
303 // while parsing the class before it is assigned into the class.
304 // If it gets an error after that it is unloaded and the constant pool will
305 // be cleaned up then.
306 class ConstantPoolCleaner : public StackObj {
307 constantPoolHandle _cphandle;
308 bool _in_error;
309 public:
310 ConstantPoolCleaner(constantPoolHandle cp) : _cphandle(cp), _in_error(true) {}
311 ~ConstantPoolCleaner() {
312 if (_in_error && _cphandle.not_null()) {
313 _cphandle->unreference_symbols();
314 }
315 }
316 void set_in_error(bool clean) { _in_error = clean; }
317 };
318
319 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
320
321 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
322 ClassFileStream* cfs = stream();
323 constantPoolHandle nullHandle;
324
325 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
326 u2 length = cfs->get_u2_fast();
327 guarantee_property(
328 length >= 1, "Illegal constant pool size %u in class file %s",
329 length, CHECK_(nullHandle));
330 constantPoolOop constant_pool =
331 oopFactory::new_constantPool(length,
332 oopDesc::IsSafeConc,
333 CHECK_(nullHandle));
334 constantPoolHandle cp (THREAD, constant_pool);
335
336 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops
337 ConstantPoolCleaner cp_in_error(cp); // set constant pool to be cleaned up.
338
339 // parsing constant pool entries
340 parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
341
342 int index = 1; // declared outside of loops for portability
343
344 // first verification pass - validate cross references and fixup class and string constants
345 for (index = 1; index < length; index++) { // Index 0 is unused
346 jbyte tag = cp->tag_at(index).value();
347 switch (tag) {
348 case JVM_CONSTANT_Class :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
350 break;
351 case JVM_CONSTANT_Fieldref :
352 // fall through
353 case JVM_CONSTANT_Methodref :
354 // fall through
355 case JVM_CONSTANT_InterfaceMethodref : {
356 if (!_need_verify) break;
357 int klass_ref_index = cp->klass_ref_index_at(index);
358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
359 check_property(valid_cp_range(klass_ref_index, length) &&
360 is_klass_reference(cp, klass_ref_index),
361 "Invalid constant pool index %u in class file %s",
362 klass_ref_index,
363 CHECK_(nullHandle));
364 check_property(valid_cp_range(name_and_type_ref_index, length) &&
365 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
366 "Invalid constant pool index %u in class file %s",
367 name_and_type_ref_index,
368 CHECK_(nullHandle));
369 break;
370 }
371 case JVM_CONSTANT_String :
372 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
373 break;
374 case JVM_CONSTANT_Integer :
375 break;
376 case JVM_CONSTANT_Float :
377 break;
378 case JVM_CONSTANT_Long :
379 case JVM_CONSTANT_Double :
380 index++;
381 check_property(
382 (index < length && cp->tag_at(index).is_invalid()),
383 "Improper constant pool long/double index %u in class file %s",
384 index, CHECK_(nullHandle));
385 break;
386 case JVM_CONSTANT_NameAndType : {
387 if (!_need_verify) break;
388 int name_ref_index = cp->name_ref_index_at(index);
389 int signature_ref_index = cp->signature_ref_index_at(index);
390 check_property(
391 valid_cp_range(name_ref_index, length) &&
392 cp->tag_at(name_ref_index).is_utf8(),
393 "Invalid constant pool index %u in class file %s",
394 name_ref_index, CHECK_(nullHandle));
395 check_property(
396 valid_cp_range(signature_ref_index, length) &&
397 cp->tag_at(signature_ref_index).is_utf8(),
398 "Invalid constant pool index %u in class file %s",
399 signature_ref_index, CHECK_(nullHandle));
400 break;
401 }
402 case JVM_CONSTANT_Utf8 :
403 break;
404 case JVM_CONSTANT_UnresolvedClass : // fall-through
405 case JVM_CONSTANT_UnresolvedClassInError:
406 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
407 break;
408 case JVM_CONSTANT_ClassIndex :
409 {
410 int class_index = cp->klass_index_at(index);
411 check_property(
412 valid_cp_range(class_index, length) &&
413 cp->tag_at(class_index).is_utf8(),
414 "Invalid constant pool index %u in class file %s",
415 class_index, CHECK_(nullHandle));
416 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
417 }
418 break;
419 case JVM_CONSTANT_UnresolvedString :
420 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
421 break;
422 case JVM_CONSTANT_StringIndex :
423 {
424 int string_index = cp->string_index_at(index);
425 check_property(
426 valid_cp_range(string_index, length) &&
427 cp->tag_at(string_index).is_utf8(),
428 "Invalid constant pool index %u in class file %s",
429 string_index, CHECK_(nullHandle));
430 Symbol* sym = cp->symbol_at(string_index);
431 cp->unresolved_string_at_put(index, sym);
432 }
433 break;
434 case JVM_CONSTANT_MethodHandle :
435 {
436 int ref_index = cp->method_handle_index_at(index);
437 check_property(
438 valid_cp_range(ref_index, length) &&
439 EnableInvokeDynamic,
440 "Invalid constant pool index %u in class file %s",
441 ref_index, CHECK_(nullHandle));
442 constantTag tag = cp->tag_at(ref_index);
443 int ref_kind = cp->method_handle_ref_kind_at(index);
444 switch (ref_kind) {
445 case JVM_REF_getField:
446 case JVM_REF_getStatic:
447 case JVM_REF_putField:
448 case JVM_REF_putStatic:
449 check_property(
450 tag.is_field(),
451 "Invalid constant pool index %u in class file %s (not a field)",
452 ref_index, CHECK_(nullHandle));
453 break;
454 case JVM_REF_invokeVirtual:
455 case JVM_REF_invokeStatic:
456 case JVM_REF_invokeSpecial:
457 case JVM_REF_newInvokeSpecial:
458 check_property(
459 tag.is_method(),
460 "Invalid constant pool index %u in class file %s (not a method)",
461 ref_index, CHECK_(nullHandle));
462 break;
463 case JVM_REF_invokeInterface:
464 check_property(
465 tag.is_interface_method(),
466 "Invalid constant pool index %u in class file %s (not an interface method)",
467 ref_index, CHECK_(nullHandle));
468 break;
469 default:
470 classfile_parse_error(
471 "Bad method handle kind at constant pool index %u in class file %s",
472 index, CHECK_(nullHandle));
473 }
474 // Keep the ref_index unchanged. It will be indirected at link-time.
475 }
476 break;
477 case JVM_CONSTANT_MethodType :
478 {
479 int ref_index = cp->method_type_index_at(index);
480 check_property(
481 valid_cp_range(ref_index, length) &&
482 cp->tag_at(ref_index).is_utf8() &&
483 EnableInvokeDynamic,
484 "Invalid constant pool index %u in class file %s",
485 ref_index, CHECK_(nullHandle));
486 }
487 break;
488 case JVM_CONSTANT_InvokeDynamic :
489 {
490 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
491 check_property(valid_cp_range(name_and_type_ref_index, length) &&
492 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
493 "Invalid constant pool index %u in class file %s",
494 name_and_type_ref_index,
495 CHECK_(nullHandle));
496 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
497 break;
498 }
499 default:
500 fatal(err_msg("bad constant pool tag value %u",
501 cp->tag_at(index).value()));
502 ShouldNotReachHere();
503 break;
504 } // end of switch
505 } // end of for
506
507 if (_cp_patches != NULL) {
508 // need to treat this_class specially...
509 assert(EnableInvokeDynamic, "");
510 int this_class_index;
511 {
512 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
513 u1* mark = cfs->current();
514 u2 flags = cfs->get_u2_fast();
515 this_class_index = cfs->get_u2_fast();
516 cfs->set_current(mark); // revert to mark
517 }
518
519 for (index = 1; index < length; index++) { // Index 0 is unused
520 if (has_cp_patch_at(index)) {
521 guarantee_property(index != this_class_index,
522 "Illegal constant pool patch to self at %d in class file %s",
523 index, CHECK_(nullHandle));
524 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
525 }
526 }
527 // Ensure that all the patches have been used.
528 for (index = 0; index < _cp_patches->length(); index++) {
529 guarantee_property(!has_cp_patch_at(index),
530 "Unused constant pool patch at %d in class file %s",
531 index, CHECK_(nullHandle));
532 }
533 }
534
535 if (!_need_verify) {
536 cp_in_error.set_in_error(false);
537 return cp;
538 }
539
540 // second verification pass - checks the strings are of the right format.
541 // but not yet to the other entries
542 for (index = 1; index < length; index++) {
543 jbyte tag = cp->tag_at(index).value();
544 switch (tag) {
545 case JVM_CONSTANT_UnresolvedClass: {
546 Symbol* class_name = cp->unresolved_klass_at(index);
547 // check the name, even if _cp_patches will overwrite it
548 verify_legal_class_name(class_name, CHECK_(nullHandle));
549 break;
550 }
551 case JVM_CONSTANT_NameAndType: {
552 if (_need_verify && _major_version >= JAVA_7_VERSION) {
553 int sig_index = cp->signature_ref_index_at(index);
554 int name_index = cp->name_ref_index_at(index);
555 Symbol* name = cp->symbol_at(name_index);
556 Symbol* sig = cp->symbol_at(sig_index);
557 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
558 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
559 } else {
560 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
561 }
562 }
563 break;
564 }
565 case JVM_CONSTANT_InvokeDynamic:
566 case JVM_CONSTANT_Fieldref:
567 case JVM_CONSTANT_Methodref:
568 case JVM_CONSTANT_InterfaceMethodref: {
569 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
570 // already verified to be utf8
571 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
572 // already verified to be utf8
573 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
574 Symbol* name = cp->symbol_at(name_ref_index);
575 Symbol* signature = cp->symbol_at(signature_ref_index);
576 if (tag == JVM_CONSTANT_Fieldref) {
577 verify_legal_field_name(name, CHECK_(nullHandle));
578 if (_need_verify && _major_version >= JAVA_7_VERSION) {
579 // Signature is verified above, when iterating NameAndType_info.
580 // Need only to be sure it's the right type.
581 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
582 throwIllegalSignature(
583 "Field", name, signature, CHECK_(nullHandle));
584 }
585 } else {
586 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
587 }
588 } else {
589 verify_legal_method_name(name, CHECK_(nullHandle));
590 if (_need_verify && _major_version >= JAVA_7_VERSION) {
591 // Signature is verified above, when iterating NameAndType_info.
592 // Need only to be sure it's the right type.
593 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
594 throwIllegalSignature(
595 "Method", name, signature, CHECK_(nullHandle));
596 }
597 } else {
598 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
599 }
600 if (tag == JVM_CONSTANT_Methodref) {
601 // 4509014: If a class method name begins with '<', it must be "<init>".
602 assert(name != NULL, "method name in constant pool is null");
603 unsigned int name_len = name->utf8_length();
604 assert(name_len > 0, "bad method name"); // already verified as legal name
605 if (name->byte_at(0) == '<') {
606 if (name != vmSymbols::object_initializer_name()) {
607 classfile_parse_error(
608 "Bad method name at constant pool index %u in class file %s",
609 name_ref_index, CHECK_(nullHandle));
610 }
611 }
612 }
613 }
614 break;
615 }
616 case JVM_CONSTANT_MethodHandle: {
617 int ref_index = cp->method_handle_index_at(index);
618 int ref_kind = cp->method_handle_ref_kind_at(index);
619 switch (ref_kind) {
620 case JVM_REF_invokeVirtual:
621 case JVM_REF_invokeStatic:
622 case JVM_REF_invokeSpecial:
623 case JVM_REF_newInvokeSpecial:
624 {
625 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
626 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
627 Symbol* name = cp->symbol_at(name_ref_index);
628 if (ref_kind == JVM_REF_newInvokeSpecial) {
629 if (name != vmSymbols::object_initializer_name()) {
630 classfile_parse_error(
631 "Bad constructor name at constant pool index %u in class file %s",
632 name_ref_index, CHECK_(nullHandle));
633 }
634 } else {
635 if (name == vmSymbols::object_initializer_name()) {
636 classfile_parse_error(
637 "Bad method name at constant pool index %u in class file %s",
638 name_ref_index, CHECK_(nullHandle));
639 }
640 }
641 }
642 break;
643 // Other ref_kinds are already fully checked in previous pass.
644 }
645 break;
646 }
647 case JVM_CONSTANT_MethodType: {
648 Symbol* no_name = vmSymbols::type_name(); // place holder
649 Symbol* signature = cp->method_type_signature_at(index);
650 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
651 break;
652 }
653 case JVM_CONSTANT_Utf8: {
654 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
655 }
656 } // end of switch
657 } // end of for
658
659 cp_in_error.set_in_error(false);
660 return cp;
661 }
662
663
664 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
665 assert(EnableInvokeDynamic, "");
666 BasicType patch_type = T_VOID;
667 switch (cp->tag_at(index).value()) {
668
669 case JVM_CONSTANT_UnresolvedClass :
670 // Patching a class means pre-resolving it.
671 // The name in the constant pool is ignored.
672 if (java_lang_Class::is_instance(patch())) {
673 guarantee_property(!java_lang_Class::is_primitive(patch()),
674 "Illegal class patch at %d in class file %s",
675 index, CHECK);
676 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
677 } else {
678 guarantee_property(java_lang_String::is_instance(patch()),
679 "Illegal class patch at %d in class file %s",
680 index, CHECK);
681 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
682 cp->unresolved_klass_at_put(index, name);
683 }
684 break;
685
686 case JVM_CONSTANT_UnresolvedString :
687 // Patching a string means pre-resolving it.
688 // The spelling in the constant pool is ignored.
689 // The constant reference may be any object whatever.
690 // If it is not a real interned string, the constant is referred
691 // to as a "pseudo-string", and must be presented to the CP
692 // explicitly, because it may require scavenging.
693 cp->pseudo_string_at_put(index, patch());
694 break;
695
696 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
697 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
698 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
699 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
700 patch_prim:
701 {
702 jvalue value;
703 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
704 guarantee_property(value_type == patch_type,
705 "Illegal primitive patch at %d in class file %s",
706 index, CHECK);
707 switch (value_type) {
708 case T_INT: cp->int_at_put(index, value.i); break;
709 case T_FLOAT: cp->float_at_put(index, value.f); break;
710 case T_LONG: cp->long_at_put(index, value.j); break;
711 case T_DOUBLE: cp->double_at_put(index, value.d); break;
712 default: assert(false, "");
713 }
714 }
715 break;
716
717 default:
718 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
719 guarantee_property(!has_cp_patch_at(index),
720 "Illegal unexpected patch at %d in class file %s",
721 index, CHECK);
722 return;
723 }
724
725 // On fall-through, mark the patch as used.
726 clear_cp_patch_at(index);
727 }
728
729
730
731 class NameSigHash: public ResourceObj {
732 public:
733 Symbol* _name; // name
734 Symbol* _sig; // signature
735 NameSigHash* _next; // Next entry in hash table
736 };
737
738
739 #define HASH_ROW_SIZE 256
740
741 unsigned int hash(Symbol* name, Symbol* sig) {
742 unsigned int raw_hash = 0;
743 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
744 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
745
746 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
747 }
748
749
750 void initialize_hashtable(NameSigHash** table) {
751 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
752 }
753
754 // Return false if the name/sig combination is found in table.
755 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
756 // The old format checker uses heap sort to find duplicates.
757 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
758 // of table since we don't expect Symbol*'s to move.
759 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
760 assert(name != NULL, "name in constant pool is NULL");
761
762 // First lookup for duplicates
763 int index = hash(name, sig);
764 NameSigHash* entry = table[index];
765 while (entry != NULL) {
766 if (entry->_name == name && entry->_sig == sig) {
767 return false;
768 }
769 entry = entry->_next;
770 }
771
772 // No duplicate is found, allocate a new entry and fill it.
773 entry = new NameSigHash();
774 entry->_name = name;
775 entry->_sig = sig;
776
777 // Insert into hash table
778 entry->_next = table[index];
779 table[index] = entry;
780
781 return true;
782 }
783
784
785 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
786 int length,
787 Handle class_loader,
788 Handle protection_domain,
789 Symbol* class_name,
790 TRAPS) {
791 ClassFileStream* cfs = stream();
792 assert(length > 0, "only called for length>0");
793 objArrayHandle nullHandle;
794 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
795 objArrayHandle interfaces (THREAD, interface_oop);
796
797 int index;
798 for (index = 0; index < length; index++) {
799 u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
800 KlassHandle interf;
801 check_property(
802 valid_cp_range(interface_index, cp->length()) &&
803 is_klass_reference(cp, interface_index),
804 "Interface name has bad constant pool index %u in class file %s",
805 interface_index, CHECK_(nullHandle));
806 if (cp->tag_at(interface_index).is_klass()) {
807 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
808 } else {
809 Symbol* unresolved_klass = cp->klass_name_at(interface_index);
810
811 // Don't need to check legal name because it's checked when parsing constant pool.
812 // But need to make sure it's not an array type.
813 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
814 "Bad interface name in class file %s", CHECK_(nullHandle));
815
816 // Call resolve_super so classcircularity is checked
817 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
818 unresolved_klass, class_loader, protection_domain,
819 false, CHECK_(nullHandle));
820 interf = KlassHandle(THREAD, k);
821
822 if (LinkWellKnownClasses) // my super type is well known to me
823 cp->klass_at_put(interface_index, interf()); // eagerly resolve
824 }
825
826 if (!Klass::cast(interf())->is_interface()) {
827 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
828 }
829 interfaces->obj_at_put(index, interf());
830 }
831
832 if (!_need_verify || length <= 1) {
833 return interfaces;
834 }
835
836 // Check if there's any duplicates in interfaces
837 ResourceMark rm(THREAD);
838 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
839 THREAD, NameSigHash*, HASH_ROW_SIZE);
840 initialize_hashtable(interface_names);
841 bool dup = false;
842 {
843 debug_only(No_Safepoint_Verifier nsv;)
844 for (index = 0; index < length; index++) {
845 klassOop k = (klassOop)interfaces->obj_at(index);
846 Symbol* name = instanceKlass::cast(k)->name();
847 // If no duplicates, add (name, NULL) in hashtable interface_names.
848 if (!put_after_lookup(name, NULL, interface_names)) {
849 dup = true;
850 break;
851 }
852 }
853 }
854 if (dup) {
855 classfile_parse_error("Duplicate interface name in class file %s",
856 CHECK_(nullHandle));
857 }
858
859 return interfaces;
860 }
861
862
863 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
864 // Make sure the constant pool entry is of a type appropriate to this field
865 guarantee_property(
866 (constantvalue_index > 0 &&
867 constantvalue_index < cp->length()),
868 "Bad initial value index %u in ConstantValue attribute in class file %s",
869 constantvalue_index, CHECK);
870 constantTag value_type = cp->tag_at(constantvalue_index);
871 switch ( cp->basic_type_for_signature_at(signature_index) ) {
872 case T_LONG:
873 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
874 break;
875 case T_FLOAT:
876 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
877 break;
878 case T_DOUBLE:
879 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
880 break;
881 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
882 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
883 break;
884 case T_OBJECT:
885 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
886 && (value_type.is_string() || value_type.is_unresolved_string())),
887 "Bad string initial value in class file %s", CHECK);
888 break;
889 default:
890 classfile_parse_error(
891 "Unable to set initial value %u in class file %s",
892 constantvalue_index, CHECK);
893 }
894 }
895
896
897 // Parse attributes for a field.
898 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
899 u2 attributes_count,
900 bool is_static, u2 signature_index,
901 u2* constantvalue_index_addr,
902 bool* is_synthetic_addr,
903 u2* generic_signature_index_addr,
904 typeArrayHandle* field_annotations,
905 TRAPS) {
906 ClassFileStream* cfs = stream();
907 assert(attributes_count > 0, "length should be greater than 0");
908 u2 constantvalue_index = 0;
909 u2 generic_signature_index = 0;
910 bool is_synthetic = false;
911 u1* runtime_visible_annotations = NULL;
912 int runtime_visible_annotations_length = 0;
913 u1* runtime_invisible_annotations = NULL;
914 int runtime_invisible_annotations_length = 0;
915 while (attributes_count--) {
916 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
917 u2 attribute_name_index = cfs->get_u2_fast();
918 u4 attribute_length = cfs->get_u4_fast();
919 check_property(valid_cp_range(attribute_name_index, cp->length()) &&
920 cp->tag_at(attribute_name_index).is_utf8(),
921 "Invalid field attribute index %u in class file %s",
922 attribute_name_index,
923 CHECK);
924 Symbol* attribute_name = cp->symbol_at(attribute_name_index);
925 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
926 // ignore if non-static
927 if (constantvalue_index != 0) {
928 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
929 }
930 check_property(
931 attribute_length == 2,
932 "Invalid ConstantValue field attribute length %u in class file %s",
933 attribute_length, CHECK);
934 constantvalue_index = cfs->get_u2(CHECK);
935 if (_need_verify) {
936 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
937 }
938 } else if (attribute_name == vmSymbols::tag_synthetic()) {
939 if (attribute_length != 0) {
940 classfile_parse_error(
941 "Invalid Synthetic field attribute length %u in class file %s",
942 attribute_length, CHECK);
943 }
944 is_synthetic = true;
945 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
946 if (attribute_length != 0) {
947 classfile_parse_error(
948 "Invalid Deprecated field attribute length %u in class file %s",
949 attribute_length, CHECK);
950 }
951 } else if (_major_version >= JAVA_1_5_VERSION) {
952 if (attribute_name == vmSymbols::tag_signature()) {
953 if (attribute_length != 2) {
954 classfile_parse_error(
955 "Wrong size %u for field's Signature attribute in class file %s",
956 attribute_length, CHECK);
957 }
958 generic_signature_index = cfs->get_u2(CHECK);
959 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
960 runtime_visible_annotations_length = attribute_length;
961 runtime_visible_annotations = cfs->get_u1_buffer();
962 assert(runtime_visible_annotations != NULL, "null visible annotations");
963 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
964 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
965 runtime_invisible_annotations_length = attribute_length;
966 runtime_invisible_annotations = cfs->get_u1_buffer();
967 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
968 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
969 } else {
970 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
971 }
972 } else {
973 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
974 }
975 }
976
977 *constantvalue_index_addr = constantvalue_index;
978 *is_synthetic_addr = is_synthetic;
979 *generic_signature_index_addr = generic_signature_index;
980 *field_annotations = assemble_annotations(runtime_visible_annotations,
981 runtime_visible_annotations_length,
982 runtime_invisible_annotations,
983 runtime_invisible_annotations_length,
984 CHECK);
985 return;
986 }
987
988
989 // Field allocation types. Used for computing field offsets.
990
991 enum FieldAllocationType {
992 STATIC_OOP, // Oops
993 STATIC_BYTE, // Boolean, Byte, char
994 STATIC_SHORT, // shorts
995 STATIC_WORD, // ints
996 STATIC_DOUBLE, // aligned long or double
997 NONSTATIC_OOP,
998 NONSTATIC_BYTE,
999 NONSTATIC_SHORT,
1000 NONSTATIC_WORD,
1001 NONSTATIC_DOUBLE,
1002 MAX_FIELD_ALLOCATION_TYPE,
1003 BAD_ALLOCATION_TYPE = -1
1004 };
1005
1006 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1007 BAD_ALLOCATION_TYPE, // 0
1008 BAD_ALLOCATION_TYPE, // 1
1009 BAD_ALLOCATION_TYPE, // 2
1010 BAD_ALLOCATION_TYPE, // 3
1011 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1012 NONSTATIC_SHORT, // T_CHAR = 5,
1013 NONSTATIC_WORD, // T_FLOAT = 6,
1014 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1015 NONSTATIC_BYTE, // T_BYTE = 8,
1016 NONSTATIC_SHORT, // T_SHORT = 9,
1017 NONSTATIC_WORD, // T_INT = 10,
1018 NONSTATIC_DOUBLE, // T_LONG = 11,
1019 NONSTATIC_OOP, // T_OBJECT = 12,
1020 NONSTATIC_OOP, // T_ARRAY = 13,
1021 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1022 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1023 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1024 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1025 BAD_ALLOCATION_TYPE, // 0
1026 BAD_ALLOCATION_TYPE, // 1
1027 BAD_ALLOCATION_TYPE, // 2
1028 BAD_ALLOCATION_TYPE, // 3
1029 STATIC_BYTE , // T_BOOLEAN = 4,
1030 STATIC_SHORT, // T_CHAR = 5,
1031 STATIC_WORD, // T_FLOAT = 6,
1032 STATIC_DOUBLE, // T_DOUBLE = 7,
1033 STATIC_BYTE, // T_BYTE = 8,
1034 STATIC_SHORT, // T_SHORT = 9,
1035 STATIC_WORD, // T_INT = 10,
1036 STATIC_DOUBLE, // T_LONG = 11,
1037 STATIC_OOP, // T_OBJECT = 12,
1038 STATIC_OOP, // T_ARRAY = 13,
1039 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1040 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1041 BAD_ALLOCATION_TYPE, // T_NARROWOOP= 16,
1042 BAD_ALLOCATION_TYPE, // T_CONFLICT = 17,
1043 };
1044
1045 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1046 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1047 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1048 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1049 return result;
1050 }
1051
1052 class FieldAllocationCount: public ResourceObj {
1053 public:
1054 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1055
1056 FieldAllocationCount() {
1057 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1058 count[i] = 0;
1059 }
1060 }
1061
1062 FieldAllocationType update(bool is_static, BasicType type) {
1063 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1064 // Make sure there is no overflow with injected fields.
1065 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1066 count[atype]++;
1067 return atype;
1068 }
1069 };
1070
1071
1072 typeArrayHandle ClassFileParser::parse_fields(Symbol* class_name,
1073 constantPoolHandle cp, bool is_interface,
1074 FieldAllocationCount *fac,
1075 objArrayHandle* fields_annotations,
1076 u2* java_fields_count_ptr, TRAPS) {
1077 ClassFileStream* cfs = stream();
1078 typeArrayHandle nullHandle;
1079 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
1080 u2 length = cfs->get_u2_fast();
1081 *java_fields_count_ptr = length;
1082
1083 int num_injected = 0;
1084 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1085
1086 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
1087 typeArrayOop new_fields = oopFactory::new_permanent_shortArray((length + num_injected) * FieldInfo::field_slots, CHECK_(nullHandle));
1088 typeArrayHandle fields(THREAD, new_fields);
1089
1090 typeArrayHandle field_annotations;
1091 for (int n = 0; n < length; n++) {
1092 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1093
1094 AccessFlags access_flags;
1095 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1096 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
1097 access_flags.set_flags(flags);
1098
1099 u2 name_index = cfs->get_u2_fast();
1100 int cp_size = cp->length();
1101 check_property(
1102 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
1103 "Invalid constant pool index %u for field name in class file %s",
1104 name_index, CHECK_(nullHandle));
1105 Symbol* name = cp->symbol_at(name_index);
1106 verify_legal_field_name(name, CHECK_(nullHandle));
1107
1108 u2 signature_index = cfs->get_u2_fast();
1109 check_property(
1110 valid_cp_range(signature_index, cp_size) &&
1111 cp->tag_at(signature_index).is_utf8(),
1112 "Invalid constant pool index %u for field signature in class file %s",
1113 signature_index, CHECK_(nullHandle));
1114 Symbol* sig = cp->symbol_at(signature_index);
1115 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1116
1117 u2 constantvalue_index = 0;
1118 bool is_synthetic = false;
1119 u2 generic_signature_index = 0;
1120 bool is_static = access_flags.is_static();
1121
1122 u2 attributes_count = cfs->get_u2_fast();
1123 if (attributes_count > 0) {
1124 parse_field_attributes(cp, attributes_count, is_static, signature_index,
1125 &constantvalue_index, &is_synthetic,
1126 &generic_signature_index, &field_annotations,
1127 CHECK_(nullHandle));
1128 if (field_annotations.not_null()) {
1129 if (fields_annotations->is_null()) {
1130 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1131 *fields_annotations = objArrayHandle(THREAD, md);
1132 }
1133 (*fields_annotations)->obj_at_put(n, field_annotations());
1134 }
1135 if (is_synthetic) {
1136 access_flags.set_is_synthetic();
1137 }
1138 }
1139
1140 FieldInfo* field = FieldInfo::from_field_array(fields(), n);
1141 field->initialize(access_flags.as_short(),
1142 name_index,
1143 signature_index,
1144 constantvalue_index,
1145 generic_signature_index,
1146 0);
1147
1148 BasicType type = cp->basic_type_for_signature_at(signature_index);
1149
1150 // Remember how many oops we encountered and compute allocation type
1151 FieldAllocationType atype = fac->update(is_static, type);
1152
1153 // The correct offset is computed later (all oop fields will be located together)
1154 // We temporarily store the allocation type in the offset field
1155 field->set_offset(atype);
1156 }
1157
1158 if (num_injected != 0) {
1159 int index = length;
1160 for (int n = 0; n < num_injected; n++) {
1161 // Check for duplicates
1162 if (injected[n].may_be_java) {
1163 Symbol* name = injected[n].name();
1164 Symbol* signature = injected[n].signature();
1165 bool duplicate = false;
1166 for (int i = 0; i < length; i++) {
1167 FieldInfo* f = FieldInfo::from_field_array(fields(), i);
1168 if (name == cp->symbol_at(f->name_index()) &&
1169 signature == cp->symbol_at(f->signature_index())) {
1170 // Symbol is desclared in Java so skip this one
1171 duplicate = true;
1172 break;
1173 }
1174 }
1175 if (duplicate) {
1176 // These will be removed from the field array at the end
1177 continue;
1178 }
1179 }
1180
1181 // Injected field
1182 FieldInfo* field = FieldInfo::from_field_array(fields(), index);
1183 field->initialize(JVM_ACC_FIELD_INTERNAL,
1184 injected[n].name_index,
1185 injected[n].signature_index,
1186 0,
1187 0,
1188 0);
1189
1190 BasicType type = FieldType::basic_type(injected[n].signature());
1191
1192 // Remember how many oops we encountered and compute allocation type
1193 FieldAllocationType atype = fac->update(false, type);
1194
1195 // The correct offset is computed later (all oop fields will be located together)
1196 // We temporarily store the allocation type in the offset field
1197 field->set_offset(atype);
1198 index++;
1199 }
1200
1201 if (index < length + num_injected) {
1202 // sometimes injected fields already exist in the Java source so
1203 // the fields array could be too long. In that case trim the
1204 // fields array.
1205 new_fields = oopFactory::new_permanent_shortArray(index * FieldInfo::field_slots, CHECK_(nullHandle));
1206 for (int i = 0; i < index * FieldInfo::field_slots; i++) {
1207 new_fields->short_at_put(i, fields->short_at(i));
1208 }
1209 fields = new_fields;
1210 }
1211 }
1212
1213 if (_need_verify && length > 1) {
1214 // Check duplicated fields
1215 ResourceMark rm(THREAD);
1216 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1217 THREAD, NameSigHash*, HASH_ROW_SIZE);
1218 initialize_hashtable(names_and_sigs);
1219 bool dup = false;
1220 {
1221 debug_only(No_Safepoint_Verifier nsv;)
1222 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
1223 Symbol* name = fs.name();
1224 Symbol* sig = fs.signature();
1225 // If no duplicates, add name/signature in hashtable names_and_sigs.
1226 if (!put_after_lookup(name, sig, names_and_sigs)) {
1227 dup = true;
1228 break;
1229 }
1230 }
1231 }
1232 if (dup) {
1233 classfile_parse_error("Duplicate field name&signature in class file %s",
1234 CHECK_(nullHandle));
1235 }
1236 }
1237
1238 return fields;
1239 }
1240
1241
1242 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1243 while (length-- > 0) {
1244 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1245 }
1246 }
1247
1248
1249 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1250 u4 exception_table_length,
1251 constantPoolHandle cp,
1252 TRAPS) {
1253 ClassFileStream* cfs = stream();
1254 typeArrayHandle nullHandle;
1255
1256 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1257 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1258 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1259
1260 int index = 0;
1261 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1262 for (unsigned int i = 0; i < exception_table_length; i++) {
1263 u2 start_pc = cfs->get_u2_fast();
1264 u2 end_pc = cfs->get_u2_fast();
1265 u2 handler_pc = cfs->get_u2_fast();
1266 u2 catch_type_index = cfs->get_u2_fast();
1267 // Will check legal target after parsing code array in verifier.
1268 if (_need_verify) {
1269 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1270 "Illegal exception table range in class file %s", CHECK_(nullHandle));
1271 guarantee_property(handler_pc < code_length,
1272 "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1273 if (catch_type_index != 0) {
1274 guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1275 is_klass_reference(cp, catch_type_index),
1276 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1277 }
1278 }
1279 exception_handlers->int_at_put(index++, start_pc);
1280 exception_handlers->int_at_put(index++, end_pc);
1281 exception_handlers->int_at_put(index++, handler_pc);
1282 exception_handlers->int_at_put(index++, catch_type_index);
1283 }
1284 return exception_handlers;
1285 }
1286
1287 void ClassFileParser::parse_linenumber_table(
1288 u4 code_attribute_length, u4 code_length,
1289 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1290 ClassFileStream* cfs = stream();
1291 unsigned int num_entries = cfs->get_u2(CHECK);
1292
1293 // Each entry is a u2 start_pc, and a u2 line_number
1294 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1295
1296 // Verify line number attribute and table length
1297 check_property(
1298 code_attribute_length == sizeof(u2) + length_in_bytes,
1299 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1300
1301 cfs->guarantee_more(length_in_bytes, CHECK);
1302
1303 if ((*write_stream) == NULL) {
1304 if (length_in_bytes > fixed_buffer_size) {
1305 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1306 } else {
1307 (*write_stream) = new CompressedLineNumberWriteStream(
1308 linenumbertable_buffer, fixed_buffer_size);
1309 }
1310 }
1311
1312 while (num_entries-- > 0) {
1313 u2 bci = cfs->get_u2_fast(); // start_pc
1314 u2 line = cfs->get_u2_fast(); // line_number
1315 guarantee_property(bci < code_length,
1316 "Invalid pc in LineNumberTable in class file %s", CHECK);
1317 (*write_stream)->write_pair(bci, line);
1318 }
1319 }
1320
1321
1322 // Class file LocalVariableTable elements.
1323 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1324 public:
1325 u2 start_bci;
1326 u2 length;
1327 u2 name_cp_index;
1328 u2 descriptor_cp_index;
1329 u2 slot;
1330 };
1331
1332
1333 class LVT_Hash: public CHeapObj {
1334 public:
1335 LocalVariableTableElement *_elem; // element
1336 LVT_Hash* _next; // Next entry in hash table
1337 };
1338
1339 unsigned int hash(LocalVariableTableElement *elem) {
1340 unsigned int raw_hash = elem->start_bci;
1341
1342 raw_hash = elem->length + raw_hash * 37;
1343 raw_hash = elem->name_cp_index + raw_hash * 37;
1344 raw_hash = elem->slot + raw_hash * 37;
1345
1346 return raw_hash % HASH_ROW_SIZE;
1347 }
1348
1349 void initialize_hashtable(LVT_Hash** table) {
1350 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1351 table[i] = NULL;
1352 }
1353 }
1354
1355 void clear_hashtable(LVT_Hash** table) {
1356 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1357 LVT_Hash* current = table[i];
1358 LVT_Hash* next;
1359 while (current != NULL) {
1360 next = current->_next;
1361 current->_next = NULL;
1362 delete(current);
1363 current = next;
1364 }
1365 table[i] = NULL;
1366 }
1367 }
1368
1369 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1370 LVT_Hash* entry = table[index];
1371
1372 /*
1373 * 3-tuple start_bci/length/slot has to be unique key,
1374 * so the following comparison seems to be redundant:
1375 * && elem->name_cp_index == entry->_elem->name_cp_index
1376 */
1377 while (entry != NULL) {
1378 if (elem->start_bci == entry->_elem->start_bci
1379 && elem->length == entry->_elem->length
1380 && elem->name_cp_index == entry->_elem->name_cp_index
1381 && elem->slot == entry->_elem->slot
1382 ) {
1383 return entry;
1384 }
1385 entry = entry->_next;
1386 }
1387 return NULL;
1388 }
1389
1390 // Return false if the local variable is found in table.
1391 // Return true if no duplicate is found.
1392 // And local variable is added as a new entry in table.
1393 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1394 // First lookup for duplicates
1395 int index = hash(elem);
1396 LVT_Hash* entry = LVT_lookup(elem, index, table);
1397
1398 if (entry != NULL) {
1399 return false;
1400 }
1401 // No duplicate is found, allocate a new entry and fill it.
1402 if ((entry = new LVT_Hash()) == NULL) {
1403 return false;
1404 }
1405 entry->_elem = elem;
1406
1407 // Insert into hash table
1408 entry->_next = table[index];
1409 table[index] = entry;
1410
1411 return true;
1412 }
1413
1414 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1415 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1416 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1417 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1418 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1419 lvt->signature_cp_index = 0;
1420 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1421 }
1422
1423 // Function is used to parse both attributes:
1424 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1425 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1426 u2 max_locals,
1427 u4 code_attribute_length,
1428 constantPoolHandle cp,
1429 u2* localvariable_table_length,
1430 bool isLVTT,
1431 TRAPS) {
1432 ClassFileStream* cfs = stream();
1433 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1434 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1435 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1436 // Verify local variable table attribute has right length
1437 if (_need_verify) {
1438 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1439 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1440 }
1441 u2* localvariable_table_start = cfs->get_u2_buffer();
1442 assert(localvariable_table_start != NULL, "null local variable table");
1443 if (!_need_verify) {
1444 cfs->skip_u2_fast(size);
1445 } else {
1446 cfs->guarantee_more(size * 2, CHECK_NULL);
1447 for(int i = 0; i < (*localvariable_table_length); i++) {
1448 u2 start_pc = cfs->get_u2_fast();
1449 u2 length = cfs->get_u2_fast();
1450 u2 name_index = cfs->get_u2_fast();
1451 u2 descriptor_index = cfs->get_u2_fast();
1452 u2 index = cfs->get_u2_fast();
1453 // Assign to a u4 to avoid overflow
1454 u4 end_pc = (u4)start_pc + (u4)length;
1455
1456 if (start_pc >= code_length) {
1457 classfile_parse_error(
1458 "Invalid start_pc %u in %s in class file %s",
1459 start_pc, tbl_name, CHECK_NULL);
1460 }
1461 if (end_pc > code_length) {
1462 classfile_parse_error(
1463 "Invalid length %u in %s in class file %s",
1464 length, tbl_name, CHECK_NULL);
1465 }
1466 int cp_size = cp->length();
1467 guarantee_property(
1468 valid_cp_range(name_index, cp_size) &&
1469 cp->tag_at(name_index).is_utf8(),
1470 "Name index %u in %s has bad constant type in class file %s",
1471 name_index, tbl_name, CHECK_NULL);
1472 guarantee_property(
1473 valid_cp_range(descriptor_index, cp_size) &&
1474 cp->tag_at(descriptor_index).is_utf8(),
1475 "Signature index %u in %s has bad constant type in class file %s",
1476 descriptor_index, tbl_name, CHECK_NULL);
1477
1478 Symbol* name = cp->symbol_at(name_index);
1479 Symbol* sig = cp->symbol_at(descriptor_index);
1480 verify_legal_field_name(name, CHECK_NULL);
1481 u2 extra_slot = 0;
1482 if (!isLVTT) {
1483 verify_legal_field_signature(name, sig, CHECK_NULL);
1484
1485 // 4894874: check special cases for double and long local variables
1486 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1487 sig == vmSymbols::type_signature(T_LONG)) {
1488 extra_slot = 1;
1489 }
1490 }
1491 guarantee_property((index + extra_slot) < max_locals,
1492 "Invalid index %u in %s in class file %s",
1493 index, tbl_name, CHECK_NULL);
1494 }
1495 }
1496 return localvariable_table_start;
1497 }
1498
1499
1500 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1501 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1502 ClassFileStream* cfs = stream();
1503 u2 index = 0; // index in the array with long/double occupying two slots
1504 u4 i1 = *u1_index;
1505 u4 i2 = *u2_index + 1;
1506 for(int i = 0; i < array_length; i++) {
1507 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1508 index++;
1509 if (tag == ITEM_Long || tag == ITEM_Double) {
1510 index++;
1511 } else if (tag == ITEM_Object) {
1512 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1513 guarantee_property(valid_cp_range(class_index, cp->length()) &&
1514 is_klass_reference(cp, class_index),
1515 "Bad class index %u in StackMap in class file %s",
1516 class_index, CHECK);
1517 } else if (tag == ITEM_Uninitialized) {
1518 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1519 guarantee_property(
1520 offset < code_length,
1521 "Bad uninitialized type offset %u in StackMap in class file %s",
1522 offset, CHECK);
1523 } else {
1524 guarantee_property(
1525 tag <= (u1)ITEM_Uninitialized,
1526 "Unknown variable type %u in StackMap in class file %s",
1527 tag, CHECK);
1528 }
1529 }
1530 u2_array[*u2_index] = index;
1531 *u1_index = i1;
1532 *u2_index = i2;
1533 }
1534
1535 typeArrayOop ClassFileParser::parse_stackmap_table(
1536 u4 code_attribute_length, TRAPS) {
1537 if (code_attribute_length == 0)
1538 return NULL;
1539
1540 ClassFileStream* cfs = stream();
1541 u1* stackmap_table_start = cfs->get_u1_buffer();
1542 assert(stackmap_table_start != NULL, "null stackmap table");
1543
1544 // check code_attribute_length first
1545 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1546
1547 if (!_need_verify && !DumpSharedSpaces) {
1548 return NULL;
1549 }
1550
1551 typeArrayOop stackmap_data =
1552 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1553
1554 stackmap_data->set_length(code_attribute_length);
1555 memcpy((void*)stackmap_data->byte_at_addr(0),
1556 (void*)stackmap_table_start, code_attribute_length);
1557 return stackmap_data;
1558 }
1559
1560 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1561 u4 method_attribute_length,
1562 constantPoolHandle cp, TRAPS) {
1563 ClassFileStream* cfs = stream();
1564 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1565 *checked_exceptions_length = cfs->get_u2_fast();
1566 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1567 u2* checked_exceptions_start = cfs->get_u2_buffer();
1568 assert(checked_exceptions_start != NULL, "null checked exceptions");
1569 if (!_need_verify) {
1570 cfs->skip_u2_fast(size);
1571 } else {
1572 // Verify each value in the checked exception table
1573 u2 checked_exception;
1574 u2 len = *checked_exceptions_length;
1575 cfs->guarantee_more(2 * len, CHECK_NULL);
1576 for (int i = 0; i < len; i++) {
1577 checked_exception = cfs->get_u2_fast();
1578 check_property(
1579 valid_cp_range(checked_exception, cp->length()) &&
1580 is_klass_reference(cp, checked_exception),
1581 "Exception name has bad type at constant pool %u in class file %s",
1582 checked_exception, CHECK_NULL);
1583 }
1584 }
1585 // check exceptions attribute length
1586 if (_need_verify) {
1587 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1588 sizeof(u2) * size),
1589 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1590 }
1591 return checked_exceptions_start;
1592 }
1593
1594 void ClassFileParser::throwIllegalSignature(
1595 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1596 ResourceMark rm(THREAD);
1597 Exceptions::fthrow(THREAD_AND_LOCATION,
1598 vmSymbols::java_lang_ClassFormatError(),
1599 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1600 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1601 }
1602
1603 #define MAX_ARGS_SIZE 255
1604 #define MAX_CODE_SIZE 65535
1605 #define INITIAL_MAX_LVT_NUMBER 256
1606
1607 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1608 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1609 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1610 // entire method attribute is parsed.
1611 //
1612 // The promoted_flags parameter is used to pass relevant access_flags
1613 // from the method back up to the containing klass. These flag values
1614 // are added to klass's access_flags.
1615
1616 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1617 AccessFlags *promoted_flags,
1618 typeArrayHandle* method_annotations,
1619 typeArrayHandle* method_parameter_annotations,
1620 typeArrayHandle* method_default_annotations,
1621 TRAPS) {
1622 ClassFileStream* cfs = stream();
1623 methodHandle nullHandle;
1624 ResourceMark rm(THREAD);
1625 // Parse fixed parts
1626 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1627
1628 int flags = cfs->get_u2_fast();
1629 u2 name_index = cfs->get_u2_fast();
1630 int cp_size = cp->length();
1631 check_property(
1632 valid_cp_range(name_index, cp_size) &&
1633 cp->tag_at(name_index).is_utf8(),
1634 "Illegal constant pool index %u for method name in class file %s",
1635 name_index, CHECK_(nullHandle));
1636 Symbol* name = cp->symbol_at(name_index);
1637 verify_legal_method_name(name, CHECK_(nullHandle));
1638
1639 u2 signature_index = cfs->get_u2_fast();
1640 guarantee_property(
1641 valid_cp_range(signature_index, cp_size) &&
1642 cp->tag_at(signature_index).is_utf8(),
1643 "Illegal constant pool index %u for method signature in class file %s",
1644 signature_index, CHECK_(nullHandle));
1645 Symbol* signature = cp->symbol_at(signature_index);
1646
1647 AccessFlags access_flags;
1648 if (name == vmSymbols::class_initializer_name()) {
1649 // We ignore the other access flags for a valid class initializer.
1650 // (JVM Spec 2nd ed., chapter 4.6)
1651 if (_major_version < 51) { // backward compatibility
1652 flags = JVM_ACC_STATIC;
1653 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1654 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1655 }
1656 } else {
1657 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1658 }
1659
1660 int args_size = -1; // only used when _need_verify is true
1661 if (_need_verify) {
1662 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1663 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1664 if (args_size > MAX_ARGS_SIZE) {
1665 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1666 }
1667 }
1668
1669 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1670
1671 // Default values for code and exceptions attribute elements
1672 u2 max_stack = 0;
1673 u2 max_locals = 0;
1674 u4 code_length = 0;
1675 u1* code_start = 0;
1676 u2 exception_table_length = 0;
1677 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1678 u2 checked_exceptions_length = 0;
1679 u2* checked_exceptions_start = NULL;
1680 CompressedLineNumberWriteStream* linenumber_table = NULL;
1681 int linenumber_table_length = 0;
1682 int total_lvt_length = 0;
1683 u2 lvt_cnt = 0;
1684 u2 lvtt_cnt = 0;
1685 bool lvt_allocated = false;
1686 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1687 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1688 u2* localvariable_table_length;
1689 u2** localvariable_table_start;
1690 u2* localvariable_type_table_length;
1691 u2** localvariable_type_table_start;
1692 bool parsed_code_attribute = false;
1693 bool parsed_checked_exceptions_attribute = false;
1694 bool parsed_stackmap_attribute = false;
1695 // stackmap attribute - JDK1.5
1696 typeArrayHandle stackmap_data;
1697 u2 generic_signature_index = 0;
1698 u1* runtime_visible_annotations = NULL;
1699 int runtime_visible_annotations_length = 0;
1700 u1* runtime_invisible_annotations = NULL;
1701 int runtime_invisible_annotations_length = 0;
1702 u1* runtime_visible_parameter_annotations = NULL;
1703 int runtime_visible_parameter_annotations_length = 0;
1704 u1* runtime_invisible_parameter_annotations = NULL;
1705 int runtime_invisible_parameter_annotations_length = 0;
1706 u1* annotation_default = NULL;
1707 int annotation_default_length = 0;
1708
1709 // Parse code and exceptions attribute
1710 u2 method_attributes_count = cfs->get_u2_fast();
1711 while (method_attributes_count--) {
1712 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
1713 u2 method_attribute_name_index = cfs->get_u2_fast();
1714 u4 method_attribute_length = cfs->get_u4_fast();
1715 check_property(
1716 valid_cp_range(method_attribute_name_index, cp_size) &&
1717 cp->tag_at(method_attribute_name_index).is_utf8(),
1718 "Invalid method attribute name index %u in class file %s",
1719 method_attribute_name_index, CHECK_(nullHandle));
1720
1721 Symbol* method_attribute_name = cp->symbol_at(method_attribute_name_index);
1722 if (method_attribute_name == vmSymbols::tag_code()) {
1723 // Parse Code attribute
1724 if (_need_verify) {
1725 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1726 "Code attribute in native or abstract methods in class file %s",
1727 CHECK_(nullHandle));
1728 }
1729 if (parsed_code_attribute) {
1730 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1731 }
1732 parsed_code_attribute = true;
1733
1734 // Stack size, locals size, and code size
1735 if (_major_version == 45 && _minor_version <= 2) {
1736 cfs->guarantee_more(4, CHECK_(nullHandle));
1737 max_stack = cfs->get_u1_fast();
1738 max_locals = cfs->get_u1_fast();
1739 code_length = cfs->get_u2_fast();
1740 } else {
1741 cfs->guarantee_more(8, CHECK_(nullHandle));
1742 max_stack = cfs->get_u2_fast();
1743 max_locals = cfs->get_u2_fast();
1744 code_length = cfs->get_u4_fast();
1745 }
1746 if (_need_verify) {
1747 guarantee_property(args_size <= max_locals,
1748 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1749 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1750 "Invalid method Code length %u in class file %s",
1751 code_length, CHECK_(nullHandle));
1752 }
1753 // Code pointer
1754 code_start = cfs->get_u1_buffer();
1755 assert(code_start != NULL, "null code start");
1756 cfs->guarantee_more(code_length, CHECK_(nullHandle));
1757 cfs->skip_u1_fast(code_length);
1758
1759 // Exception handler table
1760 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
1761 exception_table_length = cfs->get_u2_fast();
1762 if (exception_table_length > 0) {
1763 exception_handlers =
1764 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1765 }
1766
1767 // Parse additional attributes in code attribute
1768 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
1769 u2 code_attributes_count = cfs->get_u2_fast();
1770
1771 unsigned int calculated_attribute_length = 0;
1772
1773 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1774 calculated_attribute_length =
1775 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1776 } else {
1777 // max_stack, locals and length are smaller in pre-version 45.2 classes
1778 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1779 }
1780 calculated_attribute_length +=
1781 code_length +
1782 sizeof(exception_table_length) +
1783 sizeof(code_attributes_count) +
1784 exception_table_length *
1785 ( sizeof(u2) + // start_pc
1786 sizeof(u2) + // end_pc
1787 sizeof(u2) + // handler_pc
1788 sizeof(u2) ); // catch_type_index
1789
1790 while (code_attributes_count--) {
1791 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
1792 u2 code_attribute_name_index = cfs->get_u2_fast();
1793 u4 code_attribute_length = cfs->get_u4_fast();
1794 calculated_attribute_length += code_attribute_length +
1795 sizeof(code_attribute_name_index) +
1796 sizeof(code_attribute_length);
1797 check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1798 cp->tag_at(code_attribute_name_index).is_utf8(),
1799 "Invalid code attribute name index %u in class file %s",
1800 code_attribute_name_index,
1801 CHECK_(nullHandle));
1802 if (LoadLineNumberTables &&
1803 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1804 // Parse and compress line number table
1805 parse_linenumber_table(code_attribute_length, code_length,
1806 &linenumber_table, CHECK_(nullHandle));
1807
1808 } else if (LoadLocalVariableTables &&
1809 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1810 // Parse local variable table
1811 if (!lvt_allocated) {
1812 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1813 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1814 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1815 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1816 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1817 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1818 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1819 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1820 lvt_allocated = true;
1821 }
1822 if (lvt_cnt == max_lvt_cnt) {
1823 max_lvt_cnt <<= 1;
1824 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1825 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1826 }
1827 localvariable_table_start[lvt_cnt] =
1828 parse_localvariable_table(code_length,
1829 max_locals,
1830 code_attribute_length,
1831 cp,
1832 &localvariable_table_length[lvt_cnt],
1833 false, // is not LVTT
1834 CHECK_(nullHandle));
1835 total_lvt_length += localvariable_table_length[lvt_cnt];
1836 lvt_cnt++;
1837 } else if (LoadLocalVariableTypeTables &&
1838 _major_version >= JAVA_1_5_VERSION &&
1839 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1840 if (!lvt_allocated) {
1841 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1842 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1843 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1844 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1845 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1846 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
1847 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1848 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1849 lvt_allocated = true;
1850 }
1851 // Parse local variable type table
1852 if (lvtt_cnt == max_lvtt_cnt) {
1853 max_lvtt_cnt <<= 1;
1854 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1855 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1856 }
1857 localvariable_type_table_start[lvtt_cnt] =
1858 parse_localvariable_table(code_length,
1859 max_locals,
1860 code_attribute_length,
1861 cp,
1862 &localvariable_type_table_length[lvtt_cnt],
1863 true, // is LVTT
1864 CHECK_(nullHandle));
1865 lvtt_cnt++;
1866 } else if (UseSplitVerifier &&
1867 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1868 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1869 // Stack map is only needed by the new verifier in JDK1.5.
1870 if (parsed_stackmap_attribute) {
1871 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1872 }
1873 typeArrayOop sm =
1874 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1875 stackmap_data = typeArrayHandle(THREAD, sm);
1876 parsed_stackmap_attribute = true;
1877 } else {
1878 // Skip unknown attributes
1879 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1880 }
1881 }
1882 // check method attribute length
1883 if (_need_verify) {
1884 guarantee_property(method_attribute_length == calculated_attribute_length,
1885 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1886 }
1887 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1888 // Parse Exceptions attribute
1889 if (parsed_checked_exceptions_attribute) {
1890 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1891 }
1892 parsed_checked_exceptions_attribute = true;
1893 checked_exceptions_start =
1894 parse_checked_exceptions(&checked_exceptions_length,
1895 method_attribute_length,
1896 cp, CHECK_(nullHandle));
1897 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1898 if (method_attribute_length != 0) {
1899 classfile_parse_error(
1900 "Invalid Synthetic method attribute length %u in class file %s",
1901 method_attribute_length, CHECK_(nullHandle));
1902 }
1903 // Should we check that there hasn't already been a synthetic attribute?
1904 access_flags.set_is_synthetic();
1905 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1906 if (method_attribute_length != 0) {
1907 classfile_parse_error(
1908 "Invalid Deprecated method attribute length %u in class file %s",
1909 method_attribute_length, CHECK_(nullHandle));
1910 }
1911 } else if (_major_version >= JAVA_1_5_VERSION) {
1912 if (method_attribute_name == vmSymbols::tag_signature()) {
1913 if (method_attribute_length != 2) {
1914 classfile_parse_error(
1915 "Invalid Signature attribute length %u in class file %s",
1916 method_attribute_length, CHECK_(nullHandle));
1917 }
1918 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
1919 generic_signature_index = cfs->get_u2_fast();
1920 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1921 runtime_visible_annotations_length = method_attribute_length;
1922 runtime_visible_annotations = cfs->get_u1_buffer();
1923 assert(runtime_visible_annotations != NULL, "null visible annotations");
1924 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1925 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1926 runtime_invisible_annotations_length = method_attribute_length;
1927 runtime_invisible_annotations = cfs->get_u1_buffer();
1928 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1929 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1930 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1931 runtime_visible_parameter_annotations_length = method_attribute_length;
1932 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1933 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1934 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1935 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1936 runtime_invisible_parameter_annotations_length = method_attribute_length;
1937 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1938 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1939 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1940 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1941 annotation_default_length = method_attribute_length;
1942 annotation_default = cfs->get_u1_buffer();
1943 assert(annotation_default != NULL, "null annotation default");
1944 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1945 } else {
1946 // Skip unknown attributes
1947 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1948 }
1949 } else {
1950 // Skip unknown attributes
1951 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1952 }
1953 }
1954
1955 if (linenumber_table != NULL) {
1956 linenumber_table->write_terminator();
1957 linenumber_table_length = linenumber_table->position();
1958 }
1959
1960 // Make sure there's at least one Code attribute in non-native/non-abstract method
1961 if (_need_verify) {
1962 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1963 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1964 }
1965
1966 // All sizing information for a methodOop is finally available, now create it
1967 methodOop m_oop = oopFactory::new_method(code_length, access_flags, linenumber_table_length,
1968 total_lvt_length, checked_exceptions_length,
1969 oopDesc::IsSafeConc, CHECK_(nullHandle));
1970 methodHandle m (THREAD, m_oop);
1971
1972 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1973
1974 // Fill in information from fixed part (access_flags already set)
1975 m->set_constants(cp());
1976 m->set_name_index(name_index);
1977 m->set_signature_index(signature_index);
1978 m->set_generic_signature_index(generic_signature_index);
1979 #ifdef CC_INTERP
1980 // hmm is there a gc issue here??
1981 ResultTypeFinder rtf(cp->symbol_at(signature_index));
1982 m->set_result_index(rtf.type());
1983 #endif
1984
1985 if (args_size >= 0) {
1986 m->set_size_of_parameters(args_size);
1987 } else {
1988 m->compute_size_of_parameters(THREAD);
1989 }
1990 #ifdef ASSERT
1991 if (args_size >= 0) {
1992 m->compute_size_of_parameters(THREAD);
1993 assert(args_size == m->size_of_parameters(), "");
1994 }
1995 #endif
1996
1997 // Fill in code attribute information
1998 m->set_max_stack(max_stack);
1999 m->set_max_locals(max_locals);
2000 m->constMethod()->set_stackmap_data(stackmap_data());
2001
2002 /**
2003 * The exception_table field is the flag used to indicate
2004 * that the methodOop and it's associated constMethodOop are partially
2005 * initialized and thus are exempt from pre/post GC verification. Once
2006 * the field is set, the oops are considered fully initialized so make
2007 * sure that the oops can pass verification when this field is set.
2008 */
2009 m->set_exception_table(exception_handlers());
2010
2011 // Copy byte codes
2012 m->set_code(code_start);
2013
2014 // Copy line number table
2015 if (linenumber_table != NULL) {
2016 memcpy(m->compressed_linenumber_table(),
2017 linenumber_table->buffer(), linenumber_table_length);
2018 }
2019
2020 // Copy checked exceptions
2021 if (checked_exceptions_length > 0) {
2022 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2023 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2024 }
2025
2026 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2027 *
2028 * Rules for LVT's and LVTT's are:
2029 * - There can be any number of LVT's and LVTT's.
2030 * - If there are n LVT's, it is the same as if there was just
2031 * one LVT containing all the entries from the n LVT's.
2032 * - There may be no more than one LVT entry per local variable.
2033 * Two LVT entries are 'equal' if these fields are the same:
2034 * start_pc, length, name, slot
2035 * - There may be no more than one LVTT entry per each LVT entry.
2036 * Each LVTT entry has to match some LVT entry.
2037 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2038 */
2039 if (total_lvt_length > 0) {
2040 int tbl_no, idx;
2041
2042 promoted_flags->set_has_localvariable_table();
2043
2044 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
2045 initialize_hashtable(lvt_Hash);
2046
2047 // To fill LocalVariableTable in
2048 Classfile_LVT_Element* cf_lvt;
2049 LocalVariableTableElement* lvt = m->localvariable_table_start();
2050
2051 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2052 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2053 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2054 copy_lvt_element(&cf_lvt[idx], lvt);
2055 // If no duplicates, add LVT elem in hashtable lvt_Hash.
2056 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
2057 && _need_verify
2058 && _major_version >= JAVA_1_5_VERSION ) {
2059 clear_hashtable(lvt_Hash);
2060 classfile_parse_error("Duplicated LocalVariableTable attribute "
2061 "entry for '%s' in class file %s",
2062 cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2063 CHECK_(nullHandle));
2064 }
2065 }
2066 }
2067
2068 // To merge LocalVariableTable and LocalVariableTypeTable
2069 Classfile_LVT_Element* cf_lvtt;
2070 LocalVariableTableElement lvtt_elem;
2071
2072 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2073 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2074 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2075 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2076 int index = hash(&lvtt_elem);
2077 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
2078 if (entry == NULL) {
2079 if (_need_verify) {
2080 clear_hashtable(lvt_Hash);
2081 classfile_parse_error("LVTT entry for '%s' in class file %s "
2082 "does not match any LVT entry",
2083 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2084 CHECK_(nullHandle));
2085 }
2086 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
2087 clear_hashtable(lvt_Hash);
2088 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2089 "entry for '%s' in class file %s",
2090 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2091 CHECK_(nullHandle));
2092 } else {
2093 // to add generic signatures into LocalVariableTable
2094 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
2095 }
2096 }
2097 }
2098 clear_hashtable(lvt_Hash);
2099 }
2100
2101 *method_annotations = assemble_annotations(runtime_visible_annotations,
2102 runtime_visible_annotations_length,
2103 runtime_invisible_annotations,
2104 runtime_invisible_annotations_length,
2105 CHECK_(nullHandle));
2106 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2107 runtime_visible_parameter_annotations_length,
2108 runtime_invisible_parameter_annotations,
2109 runtime_invisible_parameter_annotations_length,
2110 CHECK_(nullHandle));
2111 *method_default_annotations = assemble_annotations(annotation_default,
2112 annotation_default_length,
2113 NULL,
2114 0,
2115 CHECK_(nullHandle));
2116
2117 if (name == vmSymbols::finalize_method_name() &&
2118 signature == vmSymbols::void_method_signature()) {
2119 if (m->is_empty_method()) {
2120 _has_empty_finalizer = true;
2121 } else {
2122 _has_finalizer = true;
2123 }
2124 }
2125 if (name == vmSymbols::object_initializer_name() &&
2126 signature == vmSymbols::void_method_signature() &&
2127 m->is_vanilla_constructor()) {
2128 _has_vanilla_constructor = true;
2129 }
2130
2131 if (EnableInvokeDynamic && (m->is_method_handle_invoke() ||
2132 m->is_method_handle_adapter())) {
2133 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2134 "Method handle invokers must be defined internally to the VM", nullHandle);
2135 }
2136
2137 return m;
2138 }
2139
2140
2141 // The promoted_flags parameter is used to pass relevant access_flags
2142 // from the methods back up to the containing klass. These flag values
2143 // are added to klass's access_flags.
2144
2145 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2146 AccessFlags* promoted_flags,
2147 bool* has_final_method,
2148 objArrayOop* methods_annotations_oop,
2149 objArrayOop* methods_parameter_annotations_oop,
2150 objArrayOop* methods_default_annotations_oop,
2151 TRAPS) {
2152 ClassFileStream* cfs = stream();
2153 objArrayHandle nullHandle;
2154 typeArrayHandle method_annotations;
2155 typeArrayHandle method_parameter_annotations;
2156 typeArrayHandle method_default_annotations;
2157 cfs->guarantee_more(2, CHECK_(nullHandle)); // length
2158 u2 length = cfs->get_u2_fast();
2159 if (length == 0) {
2160 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2161 } else {
2162 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2163 objArrayHandle methods(THREAD, m);
2164 HandleMark hm(THREAD);
2165 objArrayHandle methods_annotations;
2166 objArrayHandle methods_parameter_annotations;
2167 objArrayHandle methods_default_annotations;
2168 for (int index = 0; index < length; index++) {
2169 methodHandle method = parse_method(cp, is_interface,
2170 promoted_flags,
2171 &method_annotations,
2172 &method_parameter_annotations,
2173 &method_default_annotations,
2174 CHECK_(nullHandle));
2175 if (method->is_final()) {
2176 *has_final_method = true;
2177 }
2178 methods->obj_at_put(index, method());
2179 if (method_annotations.not_null()) {
2180 if (methods_annotations.is_null()) {
2181 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2182 methods_annotations = objArrayHandle(THREAD, md);
2183 }
2184 methods_annotations->obj_at_put(index, method_annotations());
2185 }
2186 if (method_parameter_annotations.not_null()) {
2187 if (methods_parameter_annotations.is_null()) {
2188 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2189 methods_parameter_annotations = objArrayHandle(THREAD, md);
2190 }
2191 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2192 }
2193 if (method_default_annotations.not_null()) {
2194 if (methods_default_annotations.is_null()) {
2195 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2196 methods_default_annotations = objArrayHandle(THREAD, md);
2197 }
2198 methods_default_annotations->obj_at_put(index, method_default_annotations());
2199 }
2200 }
2201 if (_need_verify && length > 1) {
2202 // Check duplicated methods
2203 ResourceMark rm(THREAD);
2204 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2205 THREAD, NameSigHash*, HASH_ROW_SIZE);
2206 initialize_hashtable(names_and_sigs);
2207 bool dup = false;
2208 {
2209 debug_only(No_Safepoint_Verifier nsv;)
2210 for (int i = 0; i < length; i++) {
2211 methodOop m = (methodOop)methods->obj_at(i);
2212 // If no duplicates, add name/signature in hashtable names_and_sigs.
2213 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2214 dup = true;
2215 break;
2216 }
2217 }
2218 }
2219 if (dup) {
2220 classfile_parse_error("Duplicate method name&signature in class file %s",
2221 CHECK_(nullHandle));
2222 }
2223 }
2224
2225 *methods_annotations_oop = methods_annotations();
2226 *methods_parameter_annotations_oop = methods_parameter_annotations();
2227 *methods_default_annotations_oop = methods_default_annotations();
2228
2229 return methods;
2230 }
2231 }
2232
2233
2234 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2235 objArrayHandle methods_annotations,
2236 objArrayHandle methods_parameter_annotations,
2237 objArrayHandle methods_default_annotations,
2238 TRAPS) {
2239 typeArrayHandle nullHandle;
2240 int length = methods()->length();
2241 // If JVMTI original method ordering or sharing is enabled we have to
2242 // remember the original class file ordering.
2243 // We temporarily use the vtable_index field in the methodOop to store the
2244 // class file index, so we can read in after calling qsort.
2245 // Put the method ordering in the shared archive.
2246 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2247 for (int index = 0; index < length; index++) {
2248 methodOop m = methodOop(methods->obj_at(index));
2249 assert(!m->valid_vtable_index(), "vtable index should not be set");
2250 m->set_vtable_index(index);
2251 }
2252 }
2253 // Sort method array by ascending method name (for faster lookups & vtable construction)
2254 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2255 methodOopDesc::sort_methods(methods(),
2256 methods_annotations(),
2257 methods_parameter_annotations(),
2258 methods_default_annotations());
2259
2260 // If JVMTI original method ordering or sharing is enabled construct int
2261 // array remembering the original ordering
2262 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2263 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2264 typeArrayHandle method_ordering(THREAD, new_ordering);
2265 for (int index = 0; index < length; index++) {
2266 methodOop m = methodOop(methods->obj_at(index));
2267 int old_index = m->vtable_index();
2268 assert(old_index >= 0 && old_index < length, "invalid method index");
2269 method_ordering->int_at_put(index, old_index);
2270 m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2271 }
2272 return method_ordering;
2273 } else {
2274 return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2275 }
2276 }
2277
2278
2279 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2280 ClassFileStream* cfs = stream();
2281 cfs->guarantee_more(2, CHECK); // sourcefile_index
2282 u2 sourcefile_index = cfs->get_u2_fast();
2283 check_property(
2284 valid_cp_range(sourcefile_index, cp->length()) &&
2285 cp->tag_at(sourcefile_index).is_utf8(),
2286 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2287 sourcefile_index, CHECK);
2288 k->set_source_file_name(cp->symbol_at(sourcefile_index));
2289 }
2290
2291
2292
2293 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2294 instanceKlassHandle k,
2295 int length, TRAPS) {
2296 ClassFileStream* cfs = stream();
2297 u1* sde_buffer = cfs->get_u1_buffer();
2298 assert(sde_buffer != NULL, "null sde buffer");
2299
2300 // Don't bother storing it if there is no way to retrieve it
2301 if (JvmtiExport::can_get_source_debug_extension()) {
2302 // Optimistically assume that only 1 byte UTF format is used
2303 // (common case)
2304 TempNewSymbol sde_symbol = SymbolTable::new_symbol((const char*)sde_buffer, length, CHECK);
2305 k->set_source_debug_extension(sde_symbol);
2306 // Note that set_source_debug_extension() increments the reference count
2307 // for its copy of the Symbol*, so use a TempNewSymbol here.
2308 }
2309 // Got utf8 string, set stream position forward
2310 cfs->skip_u1(length, CHECK);
2311 }
2312
2313
2314 // Inner classes can be static, private or protected (classic VM does this)
2315 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2316
2317 // Return number of classes in the inner classes attribute table
2318 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2319 bool parsed_enclosingmethod_attribute,
2320 u2 enclosing_method_class_index,
2321 u2 enclosing_method_method_index,
2322 constantPoolHandle cp,
2323 instanceKlassHandle k, TRAPS) {
2324 ClassFileStream* cfs = stream();
2325 u1* current_mark = cfs->current();
2326 u2 length = 0;
2327 if (inner_classes_attribute_start != NULL) {
2328 cfs->set_current(inner_classes_attribute_start);
2329 cfs->guarantee_more(2, CHECK_0); // length
2330 length = cfs->get_u2_fast();
2331 }
2332
2333 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2334 // method data:
2335 // [inner_class_info_index,
2336 // outer_class_info_index,
2337 // inner_name_index,
2338 // inner_class_access_flags,
2339 // ...
2340 // enclosing_method_class_index,
2341 // enclosing_method_method_index]
2342 u2 size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2343 typeArrayOop ic = oopFactory::new_permanent_shortArray(size, CHECK_0);
2344 typeArrayHandle inner_classes(THREAD, ic);
2345 int index = 0;
2346 int cp_size = cp->length();
2347 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2348 for (int n = 0; n < length; n++) {
2349 // Inner class index
2350 u2 inner_class_info_index = cfs->get_u2_fast();
2351 check_property(
2352 inner_class_info_index == 0 ||
2353 (valid_cp_range(inner_class_info_index, cp_size) &&
2354 is_klass_reference(cp, inner_class_info_index)),
2355 "inner_class_info_index %u has bad constant type in class file %s",
2356 inner_class_info_index, CHECK_0);
2357 // Outer class index
2358 u2 outer_class_info_index = cfs->get_u2_fast();
2359 check_property(
2360 outer_class_info_index == 0 ||
2361 (valid_cp_range(outer_class_info_index, cp_size) &&
2362 is_klass_reference(cp, outer_class_info_index)),
2363 "outer_class_info_index %u has bad constant type in class file %s",
2364 outer_class_info_index, CHECK_0);
2365 // Inner class name
2366 u2 inner_name_index = cfs->get_u2_fast();
2367 check_property(
2368 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2369 cp->tag_at(inner_name_index).is_utf8()),
2370 "inner_name_index %u has bad constant type in class file %s",
2371 inner_name_index, CHECK_0);
2372 if (_need_verify) {
2373 guarantee_property(inner_class_info_index != outer_class_info_index,
2374 "Class is both outer and inner class in class file %s", CHECK_0);
2375 }
2376 // Access flags
2377 AccessFlags inner_access_flags;
2378 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2379 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2380 // Set abstract bit for old class files for backward compatibility
2381 flags |= JVM_ACC_ABSTRACT;
2382 }
2383 verify_legal_class_modifiers(flags, CHECK_0);
2384 inner_access_flags.set_flags(flags);
2385
2386 inner_classes->short_at_put(index++, inner_class_info_index);
2387 inner_classes->short_at_put(index++, outer_class_info_index);
2388 inner_classes->short_at_put(index++, inner_name_index);
2389 inner_classes->short_at_put(index++, inner_access_flags.as_short());
2390 }
2391
2392 // 4347400: make sure there's no duplicate entry in the classes array
2393 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2394 for(int i = 0; i < inner_classes->length(); i += 4) {
2395 for(int j = i + 4; j < inner_classes->length(); j += 4) {
2396 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) ||
2397 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2398 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2399 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2400 "Duplicate entry in InnerClasses in class file %s",
2401 CHECK_0);
2402 }
2403 }
2404 }
2405
2406 // Set EnclosingMethod class and method indexes.
2407 if (parsed_enclosingmethod_attribute) {
2408 inner_classes->short_at_put(index++, enclosing_method_class_index);
2409 inner_classes->short_at_put(index++, enclosing_method_method_index);
2410 }
2411
2412 // Update instanceKlass with inner class info.
2413 k->set_inner_classes(inner_classes());
2414
2415 // Restore buffer's current position.
2416 cfs->set_current(current_mark);
2417
2418 return length;
2419 }
2420
2421 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2422 k->set_is_synthetic();
2423 }
2424
2425 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2426 ClassFileStream* cfs = stream();
2427 u2 signature_index = cfs->get_u2(CHECK);
2428 check_property(
2429 valid_cp_range(signature_index, cp->length()) &&
2430 cp->tag_at(signature_index).is_utf8(),
2431 "Invalid constant pool index %u in Signature attribute in class file %s",
2432 signature_index, CHECK);
2433 k->set_generic_signature(cp->symbol_at(signature_index));
2434 }
2435
2436 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k,
2437 u4 attribute_byte_length, TRAPS) {
2438 ClassFileStream* cfs = stream();
2439 u1* current_start = cfs->current();
2440
2441 cfs->guarantee_more(2, CHECK); // length
2442 int attribute_array_length = cfs->get_u2_fast();
2443
2444 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2445 "Short length on BootstrapMethods in class file %s",
2446 CHECK);
2447
2448 // The attribute contains a counted array of counted tuples of shorts,
2449 // represending bootstrap specifiers:
2450 // length*{bootstrap_method_index, argument_count*{argument_index}}
2451 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2452 // operand_count = number of shorts in attr, except for leading length
2453
2454 // The attribute is copied into a short[] array.
2455 // The array begins with a series of short[2] pairs, one for each tuple.
2456 int index_size = (attribute_array_length * 2);
2457
2458 typeArrayOop operands_oop = oopFactory::new_permanent_intArray(index_size + operand_count, CHECK);
2459 typeArrayHandle operands(THREAD, operands_oop);
2460 operands_oop = NULL; // tidy
2461
2462 int operand_fill_index = index_size;
2463 int cp_size = cp->length();
2464
2465 for (int n = 0; n < attribute_array_length; n++) {
2466 // Store a 32-bit offset into the header of the operand array.
2467 assert(constantPoolOopDesc::operand_offset_at(operands(), n) == 0, "");
2468 constantPoolOopDesc::operand_offset_at_put(operands(), n, operand_fill_index);
2469
2470 // Read a bootstrap specifier.
2471 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2472 u2 bootstrap_method_index = cfs->get_u2_fast();
2473 u2 argument_count = cfs->get_u2_fast();
2474 check_property(
2475 valid_cp_range(bootstrap_method_index, cp_size) &&
2476 cp->tag_at(bootstrap_method_index).is_method_handle(),
2477 "bootstrap_method_index %u has bad constant type in class file %s",
2478 bootstrap_method_index,
2479 CHECK);
2480 operands->short_at_put(operand_fill_index++, bootstrap_method_index);
2481 operands->short_at_put(operand_fill_index++, argument_count);
2482
2483 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2484 for (int j = 0; j < argument_count; j++) {
2485 u2 argument_index = cfs->get_u2_fast();
2486 check_property(
2487 valid_cp_range(argument_index, cp_size) &&
2488 cp->tag_at(argument_index).is_loadable_constant(),
2489 "argument_index %u has bad constant type in class file %s",
2490 argument_index,
2491 CHECK);
2492 operands->short_at_put(operand_fill_index++, argument_index);
2493 }
2494 }
2495
2496 assert(operand_fill_index == operands()->length(), "exact fill");
2497 assert(constantPoolOopDesc::operand_array_length(operands()) == attribute_array_length, "correct decode");
2498
2499 u1* current_end = cfs->current();
2500 guarantee_property(current_end == current_start + attribute_byte_length,
2501 "Bad length on BootstrapMethods in class file %s",
2502 CHECK);
2503
2504 cp->set_operands(operands());
2505 }
2506
2507
2508 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2509 ClassFileStream* cfs = stream();
2510 // Set inner classes attribute to default sentinel
2511 k->set_inner_classes(Universe::the_empty_short_array());
2512 cfs->guarantee_more(2, CHECK); // attributes_count
2513 u2 attributes_count = cfs->get_u2_fast();
2514 bool parsed_sourcefile_attribute = false;
2515 bool parsed_innerclasses_attribute = false;
2516 bool parsed_enclosingmethod_attribute = false;
2517 bool parsed_bootstrap_methods_attribute = false;
2518 u1* runtime_visible_annotations = NULL;
2519 int runtime_visible_annotations_length = 0;
2520 u1* runtime_invisible_annotations = NULL;
2521 int runtime_invisible_annotations_length = 0;
2522 u1* inner_classes_attribute_start = NULL;
2523 u4 inner_classes_attribute_length = 0;
2524 u2 enclosing_method_class_index = 0;
2525 u2 enclosing_method_method_index = 0;
2526 // Iterate over attributes
2527 while (attributes_count--) {
2528 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2529 u2 attribute_name_index = cfs->get_u2_fast();
2530 u4 attribute_length = cfs->get_u4_fast();
2531 check_property(
2532 valid_cp_range(attribute_name_index, cp->length()) &&
2533 cp->tag_at(attribute_name_index).is_utf8(),
2534 "Attribute name has bad constant pool index %u in class file %s",
2535 attribute_name_index, CHECK);
2536 Symbol* tag = cp->symbol_at(attribute_name_index);
2537 if (tag == vmSymbols::tag_source_file()) {
2538 // Check for SourceFile tag
2539 if (_need_verify) {
2540 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2541 }
2542 if (parsed_sourcefile_attribute) {
2543 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2544 } else {
2545 parsed_sourcefile_attribute = true;
2546 }
2547 parse_classfile_sourcefile_attribute(cp, k, CHECK);
2548 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2549 // Check for SourceDebugExtension tag
2550 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2551 } else if (tag == vmSymbols::tag_inner_classes()) {
2552 // Check for InnerClasses tag
2553 if (parsed_innerclasses_attribute) {
2554 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2555 } else {
2556 parsed_innerclasses_attribute = true;
2557 }
2558 inner_classes_attribute_start = cfs->get_u1_buffer();
2559 inner_classes_attribute_length = attribute_length;
2560 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2561 } else if (tag == vmSymbols::tag_synthetic()) {
2562 // Check for Synthetic tag
2563 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2564 if (attribute_length != 0) {
2565 classfile_parse_error(
2566 "Invalid Synthetic classfile attribute length %u in class file %s",
2567 attribute_length, CHECK);
2568 }
2569 parse_classfile_synthetic_attribute(cp, k, CHECK);
2570 } else if (tag == vmSymbols::tag_deprecated()) {
2571 // Check for Deprecatd tag - 4276120
2572 if (attribute_length != 0) {
2573 classfile_parse_error(
2574 "Invalid Deprecated classfile attribute length %u in class file %s",
2575 attribute_length, CHECK);
2576 }
2577 } else if (_major_version >= JAVA_1_5_VERSION) {
2578 if (tag == vmSymbols::tag_signature()) {
2579 if (attribute_length != 2) {
2580 classfile_parse_error(
2581 "Wrong Signature attribute length %u in class file %s",
2582 attribute_length, CHECK);
2583 }
2584 parse_classfile_signature_attribute(cp, k, CHECK);
2585 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2586 runtime_visible_annotations_length = attribute_length;
2587 runtime_visible_annotations = cfs->get_u1_buffer();
2588 assert(runtime_visible_annotations != NULL, "null visible annotations");
2589 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2590 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2591 runtime_invisible_annotations_length = attribute_length;
2592 runtime_invisible_annotations = cfs->get_u1_buffer();
2593 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2594 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2595 } else if (tag == vmSymbols::tag_enclosing_method()) {
2596 if (parsed_enclosingmethod_attribute) {
2597 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2598 } else {
2599 parsed_enclosingmethod_attribute = true;
2600 }
2601 cfs->guarantee_more(4, CHECK); // class_index, method_index
2602 enclosing_method_class_index = cfs->get_u2_fast();
2603 enclosing_method_method_index = cfs->get_u2_fast();
2604 if (enclosing_method_class_index == 0) {
2605 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2606 }
2607 // Validate the constant pool indices and types
2608 if (!cp->is_within_bounds(enclosing_method_class_index) ||
2609 !is_klass_reference(cp, enclosing_method_class_index)) {
2610 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2611 }
2612 if (enclosing_method_method_index != 0 &&
2613 (!cp->is_within_bounds(enclosing_method_method_index) ||
2614 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2615 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2616 }
2617 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2618 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2619 if (parsed_bootstrap_methods_attribute)
2620 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2621 parsed_bootstrap_methods_attribute = true;
2622 parse_classfile_bootstrap_methods_attribute(cp, k, attribute_length, CHECK);
2623 } else {
2624 // Unknown attribute
2625 cfs->skip_u1(attribute_length, CHECK);
2626 }
2627 } else {
2628 // Unknown attribute
2629 cfs->skip_u1(attribute_length, CHECK);
2630 }
2631 }
2632 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2633 runtime_visible_annotations_length,
2634 runtime_invisible_annotations,
2635 runtime_invisible_annotations_length,
2636 CHECK);
2637 k->set_class_annotations(annotations());
2638
2639 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2640 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2641 inner_classes_attribute_start, parsed_innerclasses_attribute,
2642 enclosing_method_class_index, enclosing_method_method_index,
2643 cp, k, CHECK);
2644 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2645 guarantee_property(
2646 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2647 "Wrong InnerClasses attribute length in class file %s", CHECK);
2648 }
2649 }
2650
2651 if (_max_bootstrap_specifier_index >= 0) {
2652 guarantee_property(parsed_bootstrap_methods_attribute,
2653 "Missing BootstrapMethods attribute in class file %s", CHECK);
2654 }
2655 }
2656
2657
2658 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2659 int runtime_visible_annotations_length,
2660 u1* runtime_invisible_annotations,
2661 int runtime_invisible_annotations_length, TRAPS) {
2662 typeArrayHandle annotations;
2663 if (runtime_visible_annotations != NULL ||
2664 runtime_invisible_annotations != NULL) {
2665 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2666 runtime_invisible_annotations_length, CHECK_(annotations));
2667 annotations = typeArrayHandle(THREAD, anno);
2668 if (runtime_visible_annotations != NULL) {
2669 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2670 }
2671 if (runtime_invisible_annotations != NULL) {
2672 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2673 }
2674 }
2675 return annotations;
2676 }
2677
2678
2679 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
2680 Handle class_loader,
2681 Handle protection_domain,
2682 KlassHandle host_klass,
2683 GrowableArray<Handle>* cp_patches,
2684 TempNewSymbol& parsed_name,
2685 bool verify,
2686 TRAPS) {
2687 // When a retransformable agent is attached, JVMTI caches the
2688 // class bytes that existed before the first retransformation.
2689 // If RedefineClasses() was used before the retransformable
2690 // agent attached, then the cached class bytes may not be the
2691 // original class bytes.
2692 unsigned char *cached_class_file_bytes = NULL;
2693 jint cached_class_file_length;
2694
2695 ClassFileStream* cfs = stream();
2696 // Timing
2697 assert(THREAD->is_Java_thread(), "must be a JavaThread");
2698 JavaThread* jt = (JavaThread*) THREAD;
2699
2700 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2701 ClassLoader::perf_class_parse_selftime(),
2702 NULL,
2703 jt->get_thread_stat()->perf_recursion_counts_addr(),
2704 jt->get_thread_stat()->perf_timers_addr(),
2705 PerfClassTraceTime::PARSE_CLASS);
2706
2707 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2708 _max_bootstrap_specifier_index = -1;
2709
2710 if (JvmtiExport::should_post_class_file_load_hook()) {
2711 // Get the cached class file bytes (if any) from the class that
2712 // is being redefined or retransformed. We use jvmti_thread_state()
2713 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
2714 // a JvmtiThreadState any earlier than necessary. This will help
2715 // avoid the bug described by 7126851.
2716 JvmtiThreadState *state = jt->jvmti_thread_state();
2717 if (state != NULL) {
2718 KlassHandle *h_class_being_redefined =
2719 state->get_class_being_redefined();
2720 if (h_class_being_redefined != NULL) {
2721 instanceKlassHandle ikh_class_being_redefined =
2722 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
2723 cached_class_file_bytes =
2724 ikh_class_being_redefined->get_cached_class_file_bytes();
2725 cached_class_file_length =
2726 ikh_class_being_redefined->get_cached_class_file_len();
2727 }
2728 }
2729
2730 unsigned char* ptr = cfs->buffer();
2731 unsigned char* end_ptr = cfs->buffer() + cfs->length();
2732
2733 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2734 &ptr, &end_ptr,
2735 &cached_class_file_bytes,
2736 &cached_class_file_length);
2737
2738 if (ptr != cfs->buffer()) {
2739 // JVMTI agent has modified class file data.
2740 // Set new class file stream using JVMTI agent modified
2741 // class file data.
2742 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2743 set_stream(cfs);
2744 }
2745 }
2746
2747 _host_klass = host_klass;
2748 _cp_patches = cp_patches;
2749
2750 instanceKlassHandle nullHandle;
2751
2752 // Figure out whether we can skip format checking (matching classic VM behavior)
2753 _need_verify = Verifier::should_verify_for(class_loader(), verify);
2754
2755 // Set the verify flag in stream
2756 cfs->set_verify(_need_verify);
2757
2758 // Save the class file name for easier error message printing.
2759 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
2760
2761 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
2762 // Magic value
2763 u4 magic = cfs->get_u4_fast();
2764 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2765 "Incompatible magic value %u in class file %s",
2766 magic, CHECK_(nullHandle));
2767
2768 // Version numbers
2769 u2 minor_version = cfs->get_u2_fast();
2770 u2 major_version = cfs->get_u2_fast();
2771
2772 // Check version numbers - we check this even with verifier off
2773 if (!is_supported_version(major_version, minor_version)) {
2774 if (name == NULL) {
2775 Exceptions::fthrow(
2776 THREAD_AND_LOCATION,
2777 vmSymbols::java_lang_UnsupportedClassVersionError(),
2778 "Unsupported major.minor version %u.%u",
2779 major_version,
2780 minor_version);
2781 } else {
2782 ResourceMark rm(THREAD);
2783 Exceptions::fthrow(
2784 THREAD_AND_LOCATION,
2785 vmSymbols::java_lang_UnsupportedClassVersionError(),
2786 "%s : Unsupported major.minor version %u.%u",
2787 name->as_C_string(),
2788 major_version,
2789 minor_version);
2790 }
2791 return nullHandle;
2792 }
2793
2794 _major_version = major_version;
2795 _minor_version = minor_version;
2796
2797
2798 // Check if verification needs to be relaxed for this class file
2799 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2800 _relax_verify = Verifier::relax_verify_for(class_loader());
2801
2802 // Constant pool
2803 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2804 ConstantPoolCleaner error_handler(cp); // set constant pool to be cleaned up.
2805
2806 int cp_size = cp->length();
2807
2808 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
2809
2810 // Access flags
2811 AccessFlags access_flags;
2812 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2813
2814 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2815 // Set abstract bit for old class files for backward compatibility
2816 flags |= JVM_ACC_ABSTRACT;
2817 }
2818 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2819 access_flags.set_flags(flags);
2820
2821 // This class and superclass
2822 instanceKlassHandle super_klass;
2823 u2 this_class_index = cfs->get_u2_fast();
2824 check_property(
2825 valid_cp_range(this_class_index, cp_size) &&
2826 cp->tag_at(this_class_index).is_unresolved_klass(),
2827 "Invalid this class index %u in constant pool in class file %s",
2828 this_class_index, CHECK_(nullHandle));
2829
2830 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
2831 assert(class_name != NULL, "class_name can't be null");
2832
2833 // It's important to set parsed_name *before* resolving the super class.
2834 // (it's used for cleanup by the caller if parsing fails)
2835 parsed_name = class_name;
2836 // parsed_name is returned and can be used if there's an error, so add to
2837 // its reference count. Caller will decrement the refcount.
2838 parsed_name->increment_refcount();
2839
2840 // Update _class_name which could be null previously to be class_name
2841 _class_name = class_name;
2842
2843 // Don't need to check whether this class name is legal or not.
2844 // It has been checked when constant pool is parsed.
2845 // However, make sure it is not an array type.
2846 if (_need_verify) {
2847 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2848 "Bad class name in class file %s",
2849 CHECK_(nullHandle));
2850 }
2851
2852 klassOop preserve_this_klass; // for storing result across HandleMark
2853
2854 // release all handles when parsing is done
2855 { HandleMark hm(THREAD);
2856
2857 // Checks if name in class file matches requested name
2858 if (name != NULL && class_name != name) {
2859 ResourceMark rm(THREAD);
2860 Exceptions::fthrow(
2861 THREAD_AND_LOCATION,
2862 vmSymbols::java_lang_NoClassDefFoundError(),
2863 "%s (wrong name: %s)",
2864 name->as_C_string(),
2865 class_name->as_C_string()
2866 );
2867 return nullHandle;
2868 }
2869
2870 if (TraceClassLoadingPreorder) {
2871 tty->print("[Loading %s", name->as_klass_external_name());
2872 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2873 tty->print_cr("]");
2874 }
2875
2876 u2 super_class_index = cfs->get_u2_fast();
2877 if (super_class_index == 0) {
2878 check_property(class_name == vmSymbols::java_lang_Object(),
2879 "Invalid superclass index %u in class file %s",
2880 super_class_index,
2881 CHECK_(nullHandle));
2882 } else {
2883 check_property(valid_cp_range(super_class_index, cp_size) &&
2884 is_klass_reference(cp, super_class_index),
2885 "Invalid superclass index %u in class file %s",
2886 super_class_index,
2887 CHECK_(nullHandle));
2888 // The class name should be legal because it is checked when parsing constant pool.
2889 // However, make sure it is not an array type.
2890 bool is_array = false;
2891 if (cp->tag_at(super_class_index).is_klass()) {
2892 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2893 if (_need_verify)
2894 is_array = super_klass->oop_is_array();
2895 } else if (_need_verify) {
2896 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2897 }
2898 if (_need_verify) {
2899 guarantee_property(!is_array,
2900 "Bad superclass name in class file %s", CHECK_(nullHandle));
2901 }
2902 }
2903
2904 // Interfaces
2905 u2 itfs_len = cfs->get_u2_fast();
2906 objArrayHandle local_interfaces;
2907 if (itfs_len == 0) {
2908 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2909 } else {
2910 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2911 }
2912
2913 u2 java_fields_count = 0;
2914 // Fields (offsets are filled in later)
2915 FieldAllocationCount fac;
2916 objArrayHandle fields_annotations;
2917 typeArrayHandle fields = parse_fields(class_name, cp, access_flags.is_interface(), &fac, &fields_annotations,
2918 &java_fields_count,
2919 CHECK_(nullHandle));
2920 // Methods
2921 bool has_final_method = false;
2922 AccessFlags promoted_flags;
2923 promoted_flags.set_flags(0);
2924 // These need to be oop pointers because they are allocated lazily
2925 // inside parse_methods inside a nested HandleMark
2926 objArrayOop methods_annotations_oop = NULL;
2927 objArrayOop methods_parameter_annotations_oop = NULL;
2928 objArrayOop methods_default_annotations_oop = NULL;
2929 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2930 &promoted_flags,
2931 &has_final_method,
2932 &methods_annotations_oop,
2933 &methods_parameter_annotations_oop,
2934 &methods_default_annotations_oop,
2935 CHECK_(nullHandle));
2936
2937 objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2938 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2939 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2940
2941 // We check super class after class file is parsed and format is checked
2942 if (super_class_index > 0 && super_klass.is_null()) {
2943 Symbol* sk = cp->klass_name_at(super_class_index);
2944 if (access_flags.is_interface()) {
2945 // Before attempting to resolve the superclass, check for class format
2946 // errors not checked yet.
2947 guarantee_property(sk == vmSymbols::java_lang_Object(),
2948 "Interfaces must have java.lang.Object as superclass in class file %s",
2949 CHECK_(nullHandle));
2950 }
2951 klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2952 sk,
2953 class_loader,
2954 protection_domain,
2955 true,
2956 CHECK_(nullHandle));
2957
2958 KlassHandle kh (THREAD, k);
2959 super_klass = instanceKlassHandle(THREAD, kh());
2960 if (LinkWellKnownClasses) // my super class is well known to me
2961 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2962 }
2963 if (super_klass.not_null()) {
2964 if (super_klass->is_interface()) {
2965 ResourceMark rm(THREAD);
2966 Exceptions::fthrow(
2967 THREAD_AND_LOCATION,
2968 vmSymbols::java_lang_IncompatibleClassChangeError(),
2969 "class %s has interface %s as super class",
2970 class_name->as_klass_external_name(),
2971 super_klass->external_name()
2972 );
2973 return nullHandle;
2974 }
2975 // Make sure super class is not final
2976 if (super_klass->is_final()) {
2977 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2978 }
2979 }
2980
2981 // Compute the transitive list of all unique interfaces implemented by this class
2982 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2983
2984 // sort methods
2985 typeArrayHandle method_ordering = sort_methods(methods,
2986 methods_annotations,
2987 methods_parameter_annotations,
2988 methods_default_annotations,
2989 CHECK_(nullHandle));
2990
2991 // promote flags from parse_methods() to the klass' flags
2992 access_flags.add_promoted_flags(promoted_flags.as_int());
2993
2994 // Size of Java vtable (in words)
2995 int vtable_size = 0;
2996 int itable_size = 0;
2997 int num_miranda_methods = 0;
2998
2999 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3000 num_miranda_methods,
3001 super_klass(),
3002 methods(),
3003 access_flags,
3004 class_loader,
3005 class_name,
3006 local_interfaces(),
3007 CHECK_(nullHandle));
3008
3009 // Size of Java itable (in words)
3010 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3011
3012 // Field size and offset computation
3013 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3014 #ifndef PRODUCT
3015 int orig_nonstatic_field_size = 0;
3016 #endif
3017 int static_field_size = 0;
3018 int next_static_oop_offset;
3019 int next_static_double_offset;
3020 int next_static_word_offset;
3021 int next_static_short_offset;
3022 int next_static_byte_offset;
3023 int next_static_type_offset;
3024 int next_nonstatic_oop_offset;
3025 int next_nonstatic_double_offset;
3026 int next_nonstatic_word_offset;
3027 int next_nonstatic_short_offset;
3028 int next_nonstatic_byte_offset;
3029 int next_nonstatic_type_offset;
3030 int first_nonstatic_oop_offset;
3031 int first_nonstatic_field_offset;
3032 int next_nonstatic_field_offset;
3033
3034 // Calculate the starting byte offsets
3035 next_static_oop_offset = instanceMirrorKlass::offset_of_static_fields();
3036 next_static_double_offset = next_static_oop_offset +
3037 (fac.count[STATIC_OOP] * heapOopSize);
3038 if ( fac.count[STATIC_DOUBLE] &&
3039 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3040 Universe::field_type_should_be_aligned(T_LONG)) ) {
3041 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3042 }
3043
3044 next_static_word_offset = next_static_double_offset +
3045 (fac.count[STATIC_DOUBLE] * BytesPerLong);
3046 next_static_short_offset = next_static_word_offset +
3047 (fac.count[STATIC_WORD] * BytesPerInt);
3048 next_static_byte_offset = next_static_short_offset +
3049 (fac.count[STATIC_SHORT] * BytesPerShort);
3050 next_static_type_offset = align_size_up((next_static_byte_offset +
3051 fac.count[STATIC_BYTE] ), wordSize );
3052 static_field_size = (next_static_type_offset -
3053 next_static_oop_offset) / wordSize;
3054
3055 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3056 nonstatic_field_size * heapOopSize;
3057 next_nonstatic_field_offset = first_nonstatic_field_offset;
3058
3059 unsigned int nonstatic_double_count = fac.count[NONSTATIC_DOUBLE];
3060 unsigned int nonstatic_word_count = fac.count[NONSTATIC_WORD];
3061 unsigned int nonstatic_short_count = fac.count[NONSTATIC_SHORT];
3062 unsigned int nonstatic_byte_count = fac.count[NONSTATIC_BYTE];
3063 unsigned int nonstatic_oop_count = fac.count[NONSTATIC_OOP];
3064
3065 bool super_has_nonstatic_fields =
3066 (super_klass() != NULL && super_klass->has_nonstatic_fields());
3067 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3068 ((nonstatic_double_count + nonstatic_word_count +
3069 nonstatic_short_count + nonstatic_byte_count +
3070 nonstatic_oop_count) != 0);
3071
3072
3073 // Prepare list of oops for oop map generation.
3074 int* nonstatic_oop_offsets;
3075 unsigned int* nonstatic_oop_counts;
3076 unsigned int nonstatic_oop_map_count = 0;
3077
3078 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3079 THREAD, int, nonstatic_oop_count + 1);
3080 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3081 THREAD, unsigned int, nonstatic_oop_count + 1);
3082
3083 first_nonstatic_oop_offset = 0; // will be set for first oop field
3084
3085 #ifndef PRODUCT
3086 if( PrintCompactFieldsSavings ) {
3087 next_nonstatic_double_offset = next_nonstatic_field_offset +
3088 (nonstatic_oop_count * heapOopSize);
3089 if ( nonstatic_double_count > 0 ) {
3090 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3091 }
3092 next_nonstatic_word_offset = next_nonstatic_double_offset +
3093 (nonstatic_double_count * BytesPerLong);
3094 next_nonstatic_short_offset = next_nonstatic_word_offset +
3095 (nonstatic_word_count * BytesPerInt);
3096 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3097 (nonstatic_short_count * BytesPerShort);
3098 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3099 nonstatic_byte_count ), heapOopSize );
3100 orig_nonstatic_field_size = nonstatic_field_size +
3101 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3102 }
3103 #endif
3104 bool compact_fields = CompactFields;
3105 int allocation_style = FieldsAllocationStyle;
3106 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3107 assert(false, "0 <= FieldsAllocationStyle <= 2");
3108 allocation_style = 1; // Optimistic
3109 }
3110
3111 // The next classes have predefined hard-coded fields offsets
3112 // (see in JavaClasses::compute_hard_coded_offsets()).
3113 // Use default fields allocation order for them.
3114 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3115 (class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3116 class_name == vmSymbols::java_lang_Class() ||
3117 class_name == vmSymbols::java_lang_ClassLoader() ||
3118 class_name == vmSymbols::java_lang_ref_Reference() ||
3119 class_name == vmSymbols::java_lang_ref_SoftReference() ||
3120 class_name == vmSymbols::java_lang_StackTraceElement() ||
3121 class_name == vmSymbols::java_lang_String() ||
3122 class_name == vmSymbols::java_lang_Throwable() ||
3123 class_name == vmSymbols::java_lang_Boolean() ||
3124 class_name == vmSymbols::java_lang_Character() ||
3125 class_name == vmSymbols::java_lang_Float() ||
3126 class_name == vmSymbols::java_lang_Double() ||
3127 class_name == vmSymbols::java_lang_Byte() ||
3128 class_name == vmSymbols::java_lang_Short() ||
3129 class_name == vmSymbols::java_lang_Integer() ||
3130 class_name == vmSymbols::java_lang_Long())) {
3131 allocation_style = 0; // Allocate oops first
3132 compact_fields = false; // Don't compact fields
3133 }
3134
3135 if( allocation_style == 0 ) {
3136 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3137 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3138 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3139 (nonstatic_oop_count * heapOopSize);
3140 } else if( allocation_style == 1 ) {
3141 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3142 next_nonstatic_double_offset = next_nonstatic_field_offset;
3143 } else if( allocation_style == 2 ) {
3144 // Fields allocation: oops fields in super and sub classes are together.
3145 if( nonstatic_field_size > 0 && super_klass() != NULL &&
3146 super_klass->nonstatic_oop_map_size() > 0 ) {
3147 int map_count = super_klass->nonstatic_oop_map_count();
3148 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3149 OopMapBlock* last_map = first_map + map_count - 1;
3150 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3151 if (next_offset == next_nonstatic_field_offset) {
3152 allocation_style = 0; // allocate oops first
3153 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3154 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3155 (nonstatic_oop_count * heapOopSize);
3156 }
3157 }
3158 if( allocation_style == 2 ) {
3159 allocation_style = 1; // allocate oops last
3160 next_nonstatic_double_offset = next_nonstatic_field_offset;
3161 }
3162 } else {
3163 ShouldNotReachHere();
3164 }
3165
3166 int nonstatic_oop_space_count = 0;
3167 int nonstatic_word_space_count = 0;
3168 int nonstatic_short_space_count = 0;
3169 int nonstatic_byte_space_count = 0;
3170 int nonstatic_oop_space_offset;
3171 int nonstatic_word_space_offset;
3172 int nonstatic_short_space_offset;
3173 int nonstatic_byte_space_offset;
3174
3175 if( nonstatic_double_count > 0 ) {
3176 int offset = next_nonstatic_double_offset;
3177 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3178 if( compact_fields && offset != next_nonstatic_double_offset ) {
3179 // Allocate available fields into the gap before double field.
3180 int length = next_nonstatic_double_offset - offset;
3181 assert(length == BytesPerInt, "");
3182 nonstatic_word_space_offset = offset;
3183 if( nonstatic_word_count > 0 ) {
3184 nonstatic_word_count -= 1;
3185 nonstatic_word_space_count = 1; // Only one will fit
3186 length -= BytesPerInt;
3187 offset += BytesPerInt;
3188 }
3189 nonstatic_short_space_offset = offset;
3190 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3191 nonstatic_short_count -= 1;
3192 nonstatic_short_space_count += 1;
3193 length -= BytesPerShort;
3194 offset += BytesPerShort;
3195 }
3196 nonstatic_byte_space_offset = offset;
3197 while( length > 0 && nonstatic_byte_count > 0 ) {
3198 nonstatic_byte_count -= 1;
3199 nonstatic_byte_space_count += 1;
3200 length -= 1;
3201 }
3202 // Allocate oop field in the gap if there are no other fields for that.
3203 nonstatic_oop_space_offset = offset;
3204 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3205 allocation_style != 0 ) { // when oop fields not first
3206 nonstatic_oop_count -= 1;
3207 nonstatic_oop_space_count = 1; // Only one will fit
3208 length -= heapOopSize;
3209 offset += heapOopSize;
3210 }
3211 }
3212 }
3213
3214 next_nonstatic_word_offset = next_nonstatic_double_offset +
3215 (nonstatic_double_count * BytesPerLong);
3216 next_nonstatic_short_offset = next_nonstatic_word_offset +
3217 (nonstatic_word_count * BytesPerInt);
3218 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3219 (nonstatic_short_count * BytesPerShort);
3220
3221 int notaligned_offset;
3222 if( allocation_style == 0 ) {
3223 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3224 } else { // allocation_style == 1
3225 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3226 if( nonstatic_oop_count > 0 ) {
3227 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3228 }
3229 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3230 }
3231 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3232 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3233 - first_nonstatic_field_offset)/heapOopSize);
3234
3235 // Iterate over fields again and compute correct offsets.
3236 // The field allocation type was temporarily stored in the offset slot.
3237 // oop fields are located before non-oop fields (static and non-static).
3238 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3239 int real_offset;
3240 FieldAllocationType atype = (FieldAllocationType) fs.offset();
3241 switch (atype) {
3242 case STATIC_OOP:
3243 real_offset = next_static_oop_offset;
3244 next_static_oop_offset += heapOopSize;
3245 break;
3246 case STATIC_BYTE:
3247 real_offset = next_static_byte_offset;
3248 next_static_byte_offset += 1;
3249 break;
3250 case STATIC_SHORT:
3251 real_offset = next_static_short_offset;
3252 next_static_short_offset += BytesPerShort;
3253 break;
3254 case STATIC_WORD:
3255 real_offset = next_static_word_offset;
3256 next_static_word_offset += BytesPerInt;
3257 break;
3258 case STATIC_DOUBLE:
3259 real_offset = next_static_double_offset;
3260 next_static_double_offset += BytesPerLong;
3261 break;
3262 case NONSTATIC_OOP:
3263 if( nonstatic_oop_space_count > 0 ) {
3264 real_offset = nonstatic_oop_space_offset;
3265 nonstatic_oop_space_offset += heapOopSize;
3266 nonstatic_oop_space_count -= 1;
3267 } else {
3268 real_offset = next_nonstatic_oop_offset;
3269 next_nonstatic_oop_offset += heapOopSize;
3270 }
3271 // Update oop maps
3272 if( nonstatic_oop_map_count > 0 &&
3273 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3274 real_offset -
3275 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3276 heapOopSize ) {
3277 // Extend current oop map
3278 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3279 } else {
3280 // Create new oop map
3281 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3282 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3283 nonstatic_oop_map_count += 1;
3284 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3285 first_nonstatic_oop_offset = real_offset;
3286 }
3287 }
3288 break;
3289 case NONSTATIC_BYTE:
3290 if( nonstatic_byte_space_count > 0 ) {
3291 real_offset = nonstatic_byte_space_offset;
3292 nonstatic_byte_space_offset += 1;
3293 nonstatic_byte_space_count -= 1;
3294 } else {
3295 real_offset = next_nonstatic_byte_offset;
3296 next_nonstatic_byte_offset += 1;
3297 }
3298 break;
3299 case NONSTATIC_SHORT:
3300 if( nonstatic_short_space_count > 0 ) {
3301 real_offset = nonstatic_short_space_offset;
3302 nonstatic_short_space_offset += BytesPerShort;
3303 nonstatic_short_space_count -= 1;
3304 } else {
3305 real_offset = next_nonstatic_short_offset;
3306 next_nonstatic_short_offset += BytesPerShort;
3307 }
3308 break;
3309 case NONSTATIC_WORD:
3310 if( nonstatic_word_space_count > 0 ) {
3311 real_offset = nonstatic_word_space_offset;
3312 nonstatic_word_space_offset += BytesPerInt;
3313 nonstatic_word_space_count -= 1;
3314 } else {
3315 real_offset = next_nonstatic_word_offset;
3316 next_nonstatic_word_offset += BytesPerInt;
3317 }
3318 break;
3319 case NONSTATIC_DOUBLE:
3320 real_offset = next_nonstatic_double_offset;
3321 next_nonstatic_double_offset += BytesPerLong;
3322 break;
3323 default:
3324 ShouldNotReachHere();
3325 }
3326 fs.set_offset(real_offset);
3327 }
3328
3329 // Size of instances
3330 int instance_size;
3331
3332 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3333 instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3334
3335 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3336
3337 // Number of non-static oop map blocks allocated at end of klass.
3338 const unsigned int total_oop_map_count =
3339 compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3340 first_nonstatic_oop_offset);
3341
3342 // Compute reference type
3343 ReferenceType rt;
3344 if (super_klass() == NULL) {
3345 rt = REF_NONE;
3346 } else {
3347 rt = super_klass->reference_type();
3348 }
3349
3350 // We can now create the basic klassOop for this klass
3351 klassOop ik = oopFactory::new_instanceKlass(name, vtable_size, itable_size,
3352 static_field_size,
3353 total_oop_map_count,
3354 rt, CHECK_(nullHandle));
3355 instanceKlassHandle this_klass (THREAD, ik);
3356
3357 assert(this_klass->static_field_size() == static_field_size, "sanity");
3358 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3359 "sanity");
3360
3361 // Fill in information already parsed
3362 this_klass->set_access_flags(access_flags);
3363 this_klass->set_should_verify_class(verify);
3364 jint lh = Klass::instance_layout_helper(instance_size, false);
3365 this_klass->set_layout_helper(lh);
3366 assert(this_klass->oop_is_instance(), "layout is correct");
3367 assert(this_klass->size_helper() == instance_size, "correct size_helper");
3368 // Not yet: supers are done below to support the new subtype-checking fields
3369 //this_klass->set_super(super_klass());
3370 this_klass->set_class_loader(class_loader());
3371 this_klass->set_nonstatic_field_size(nonstatic_field_size);
3372 this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3373 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3374 cp->set_pool_holder(this_klass());
3375 error_handler.set_in_error(false); // turn off error handler for cp
3376 this_klass->set_constants(cp());
3377 this_klass->set_local_interfaces(local_interfaces());
3378 this_klass->set_fields(fields(), java_fields_count);
3379 this_klass->set_methods(methods());
3380 if (has_final_method) {
3381 this_klass->set_has_final_method();
3382 }
3383 this_klass->set_method_ordering(method_ordering());
3384 // The instanceKlass::_methods_jmethod_ids cache and the
3385 // instanceKlass::_methods_cached_itable_indices cache are
3386 // both managed on the assumption that the initial cache
3387 // size is equal to the number of methods in the class. If
3388 // that changes, then instanceKlass::idnum_can_increment()
3389 // has to be changed accordingly.
3390 this_klass->set_initial_method_idnum(methods->length());
3391 this_klass->set_name(cp->klass_name_at(this_class_index));
3392 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself
3393 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3394 this_klass->set_protection_domain(protection_domain());
3395 this_klass->set_fields_annotations(fields_annotations());
3396 this_klass->set_methods_annotations(methods_annotations());
3397 this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3398 this_klass->set_methods_default_annotations(methods_default_annotations());
3399
3400 this_klass->set_minor_version(minor_version);
3401 this_klass->set_major_version(major_version);
3402
3403 // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3404 // (We used to do this lazily, but now we query it in Rewriter,
3405 // which is eagerly done for every method, so we might as well do it now,
3406 // when everything is fresh in memory.)
3407 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3408 for (int j = 0; j < methods->length(); j++) {
3409 ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3410 }
3411 }
3412
3413 if (cached_class_file_bytes != NULL) {
3414 // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3415 this_klass->set_cached_class_file(cached_class_file_bytes,
3416 cached_class_file_length);
3417 }
3418
3419 // Miranda methods
3420 if ((num_miranda_methods > 0) ||
3421 // if this class introduced new miranda methods or
3422 (super_klass.not_null() && (super_klass->has_miranda_methods()))
3423 // super class exists and this class inherited miranda methods
3424 ) {
3425 this_klass->set_has_miranda_methods(); // then set a flag
3426 }
3427
3428 // Additional attributes
3429 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3430
3431 // Make sure this is the end of class file stream
3432 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3433
3434 // VerifyOops believes that once this has been set, the object is completely loaded.
3435 // Compute transitive closure of interfaces this class implements
3436 this_klass->set_transitive_interfaces(transitive_interfaces());
3437
3438 // Fill in information needed to compute superclasses.
3439 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3440
3441 // Initialize itable offset tables
3442 klassItable::setup_itable_offset_table(this_klass);
3443
3444 // Do final class setup
3445 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3446
3447 set_precomputed_flags(this_klass);
3448
3449 // reinitialize modifiers, using the InnerClasses attribute
3450 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3451 this_klass->set_modifier_flags(computed_modifiers);
3452
3453 // check if this class can access its super class
3454 check_super_class_access(this_klass, CHECK_(nullHandle));
3455
3456 // check if this class can access its superinterfaces
3457 check_super_interface_access(this_klass, CHECK_(nullHandle));
3458
3459 // check if this class overrides any final method
3460 check_final_method_override(this_klass, CHECK_(nullHandle));
3461
3462 // check that if this class is an interface then it doesn't have static methods
3463 if (this_klass->is_interface()) {
3464 check_illegal_static_method(this_klass, CHECK_(nullHandle));
3465 }
3466
3467 // Allocate mirror and initialize static fields
3468 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
3469
3470 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3471 false /* not shared class */);
3472
3473 if (TraceClassLoading) {
3474 // print in a single call to reduce interleaving of output
3475 if (cfs->source() != NULL) {
3476 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3477 cfs->source());
3478 } else if (class_loader.is_null()) {
3479 if (THREAD->is_Java_thread()) {
3480 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3481 tty->print("[Loaded %s by instance of %s]\n",
3482 this_klass->external_name(),
3483 instanceKlass::cast(caller)->external_name());
3484 } else {
3485 tty->print("[Loaded %s]\n", this_klass->external_name());
3486 }
3487 } else {
3488 ResourceMark rm;
3489 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3490 instanceKlass::cast(class_loader->klass())->external_name());
3491 }
3492 }
3493
3494 if (TraceClassResolution) {
3495 // print out the superclass.
3496 const char * from = Klass::cast(this_klass())->external_name();
3497 if (this_klass->java_super() != NULL) {
3498 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3499 }
3500 // print out each of the interface classes referred to by this class.
3501 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3502 if (!local_interfaces.is_null()) {
3503 int length = local_interfaces->length();
3504 for (int i = 0; i < length; i++) {
3505 klassOop k = klassOop(local_interfaces->obj_at(i));
3506 instanceKlass* to_class = instanceKlass::cast(k);
3507 const char * to = to_class->external_name();
3508 tty->print("RESOLVE %s %s (interface)\n", from, to);
3509 }
3510 }
3511 }
3512
3513 #ifndef PRODUCT
3514 if( PrintCompactFieldsSavings ) {
3515 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3516 tty->print("[Saved %d of %d bytes in %s]\n",
3517 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3518 orig_nonstatic_field_size*heapOopSize,
3519 this_klass->external_name());
3520 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3521 tty->print("[Wasted %d over %d bytes in %s]\n",
3522 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3523 orig_nonstatic_field_size*heapOopSize,
3524 this_klass->external_name());
3525 }
3526 }
3527 #endif
3528
3529 // preserve result across HandleMark
3530 preserve_this_klass = this_klass();
3531 }
3532
3533 // Create new handle outside HandleMark
3534 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3535 debug_only(this_klass->as_klassOop()->verify();)
3536
3537 return this_klass;
3538 }
3539
3540
3541 unsigned int
3542 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3543 unsigned int nonstatic_oop_map_count,
3544 int first_nonstatic_oop_offset) {
3545 unsigned int map_count =
3546 super.is_null() ? 0 : super->nonstatic_oop_map_count();
3547 if (nonstatic_oop_map_count > 0) {
3548 // We have oops to add to map
3549 if (map_count == 0) {
3550 map_count = nonstatic_oop_map_count;
3551 } else {
3552 // Check whether we should add a new map block or whether the last one can
3553 // be extended
3554 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3555 OopMapBlock* const last_map = first_map + map_count - 1;
3556
3557 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3558 if (next_offset == first_nonstatic_oop_offset) {
3559 // There is no gap bettwen superklass's last oop field and first
3560 // local oop field, merge maps.
3561 nonstatic_oop_map_count -= 1;
3562 } else {
3563 // Superklass didn't end with a oop field, add extra maps
3564 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3565 }
3566 map_count += nonstatic_oop_map_count;
3567 }
3568 }
3569 return map_count;
3570 }
3571
3572
3573 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3574 unsigned int nonstatic_oop_map_count,
3575 int* nonstatic_oop_offsets,
3576 unsigned int* nonstatic_oop_counts) {
3577 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3578 const instanceKlass* const super = k->superklass();
3579 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3580 if (super_count > 0) {
3581 // Copy maps from superklass
3582 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3583 for (unsigned int i = 0; i < super_count; ++i) {
3584 *this_oop_map++ = *super_oop_map++;
3585 }
3586 }
3587
3588 if (nonstatic_oop_map_count > 0) {
3589 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3590 // The counts differ because there is no gap between superklass's last oop
3591 // field and the first local oop field. Extend the last oop map copied
3592 // from the superklass instead of creating new one.
3593 nonstatic_oop_map_count--;
3594 nonstatic_oop_offsets++;
3595 this_oop_map--;
3596 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3597 this_oop_map++;
3598 }
3599
3600 // Add new map blocks, fill them
3601 while (nonstatic_oop_map_count-- > 0) {
3602 this_oop_map->set_offset(*nonstatic_oop_offsets++);
3603 this_oop_map->set_count(*nonstatic_oop_counts++);
3604 this_oop_map++;
3605 }
3606 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3607 this_oop_map, "sanity");
3608 }
3609 }
3610
3611
3612 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3613 klassOop super = k->super();
3614
3615 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3616 // in which case we don't have to register objects as finalizable
3617 if (!_has_empty_finalizer) {
3618 if (_has_finalizer ||
3619 (super != NULL && super->klass_part()->has_finalizer())) {
3620 k->set_has_finalizer();
3621 }
3622 }
3623
3624 #ifdef ASSERT
3625 bool f = false;
3626 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3627 vmSymbols::void_method_signature());
3628 if (m != NULL && !m->is_empty_method()) {
3629 f = true;
3630 }
3631 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3632 #endif
3633
3634 // Check if this klass supports the java.lang.Cloneable interface
3635 if (SystemDictionary::Cloneable_klass_loaded()) {
3636 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3637 k->set_is_cloneable();
3638 }
3639 }
3640
3641 // Check if this klass has a vanilla default constructor
3642 if (super == NULL) {
3643 // java.lang.Object has empty default constructor
3644 k->set_has_vanilla_constructor();
3645 } else {
3646 if (Klass::cast(super)->has_vanilla_constructor() &&
3647 _has_vanilla_constructor) {
3648 k->set_has_vanilla_constructor();
3649 }
3650 #ifdef ASSERT
3651 bool v = false;
3652 if (Klass::cast(super)->has_vanilla_constructor()) {
3653 methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3654 ), vmSymbols::void_method_signature());
3655 if (constructor != NULL && constructor->is_vanilla_constructor()) {
3656 v = true;
3657 }
3658 }
3659 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3660 #endif
3661 }
3662
3663 // If it cannot be fast-path allocated, set a bit in the layout helper.
3664 // See documentation of instanceKlass::can_be_fastpath_allocated().
3665 assert(k->size_helper() > 0, "layout_helper is initialized");
3666 if ((!RegisterFinalizersAtInit && k->has_finalizer())
3667 || k->is_abstract() || k->is_interface()
3668 || (k->name() == vmSymbols::java_lang_Class()
3669 && k->class_loader() == NULL)
3670 || k->size_helper() >= FastAllocateSizeLimit) {
3671 // Forbid fast-path allocation.
3672 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3673 k->set_layout_helper(lh);
3674 }
3675 }
3676
3677
3678 // utility method for appending and array with check for duplicates
3679
3680 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3681 // iterate over new interfaces
3682 for (int i = 0; i < ifs->length(); i++) {
3683 oop e = ifs->obj_at(i);
3684 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3685 // check for duplicates
3686 bool duplicate = false;
3687 for (int j = 0; j < index; j++) {
3688 if (result->obj_at(j) == e) {
3689 duplicate = true;
3690 break;
3691 }
3692 }
3693 // add new interface
3694 if (!duplicate) {
3695 result->obj_at_put(index++, e);
3696 }
3697 }
3698 }
3699
3700 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3701 // Compute maximum size for transitive interfaces
3702 int max_transitive_size = 0;
3703 int super_size = 0;
3704 // Add superclass transitive interfaces size
3705 if (super.not_null()) {
3706 super_size = super->transitive_interfaces()->length();
3707 max_transitive_size += super_size;
3708 }
3709 // Add local interfaces' super interfaces
3710 int local_size = local_ifs->length();
3711 for (int i = 0; i < local_size; i++) {
3712 klassOop l = klassOop(local_ifs->obj_at(i));
3713 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3714 }
3715 // Finally add local interfaces
3716 max_transitive_size += local_size;
3717 // Construct array
3718 objArrayHandle result;
3719 if (max_transitive_size == 0) {
3720 // no interfaces, use canonicalized array
3721 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3722 } else if (max_transitive_size == super_size) {
3723 // no new local interfaces added, share superklass' transitive interface array
3724 result = objArrayHandle(THREAD, super->transitive_interfaces());
3725 } else if (max_transitive_size == local_size) {
3726 // only local interfaces added, share local interface array
3727 result = local_ifs;
3728 } else {
3729 objArrayHandle nullHandle;
3730 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3731 result = objArrayHandle(THREAD, new_objarray);
3732 int index = 0;
3733 // Copy down from superclass
3734 if (super.not_null()) {
3735 append_interfaces(result, index, super->transitive_interfaces());
3736 }
3737 // Copy down from local interfaces' superinterfaces
3738 for (int i = 0; i < local_ifs->length(); i++) {
3739 klassOop l = klassOop(local_ifs->obj_at(i));
3740 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3741 }
3742 // Finally add local interfaces
3743 append_interfaces(result, index, local_ifs());
3744
3745 // Check if duplicates were removed
3746 if (index != max_transitive_size) {
3747 assert(index < max_transitive_size, "just checking");
3748 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3749 for (int i = 0; i < index; i++) {
3750 oop e = result->obj_at(i);
3751 assert(e != NULL, "just checking");
3752 new_result->obj_at_put(i, e);
3753 }
3754 result = objArrayHandle(THREAD, new_result);
3755 }
3756 }
3757 return result;
3758 }
3759
3760
3761 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3762 klassOop super = this_klass->super();
3763 if ((super != NULL) &&
3764 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3765 ResourceMark rm(THREAD);
3766 Exceptions::fthrow(
3767 THREAD_AND_LOCATION,
3768 vmSymbols::java_lang_IllegalAccessError(),
3769 "class %s cannot access its superclass %s",
3770 this_klass->external_name(),
3771 instanceKlass::cast(super)->external_name()
3772 );
3773 return;
3774 }
3775 }
3776
3777
3778 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3779 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3780 int lng = local_interfaces->length();
3781 for (int i = lng - 1; i >= 0; i--) {
3782 klassOop k = klassOop(local_interfaces->obj_at(i));
3783 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3784 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3785 ResourceMark rm(THREAD);
3786 Exceptions::fthrow(
3787 THREAD_AND_LOCATION,
3788 vmSymbols::java_lang_IllegalAccessError(),
3789 "class %s cannot access its superinterface %s",
3790 this_klass->external_name(),
3791 instanceKlass::cast(k)->external_name()
3792 );
3793 return;
3794 }
3795 }
3796 }
3797
3798
3799 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3800 objArrayHandle methods (THREAD, this_klass->methods());
3801 int num_methods = methods->length();
3802
3803 // go thru each method and check if it overrides a final method
3804 for (int index = 0; index < num_methods; index++) {
3805 methodOop m = (methodOop)methods->obj_at(index);
3806
3807 // skip private, static and <init> methods
3808 if ((!m->is_private()) &&
3809 (!m->is_static()) &&
3810 (m->name() != vmSymbols::object_initializer_name())) {
3811
3812 Symbol* name = m->name();
3813 Symbol* signature = m->signature();
3814 klassOop k = this_klass->super();
3815 methodOop super_m = NULL;
3816 while (k != NULL) {
3817 // skip supers that don't have final methods.
3818 if (k->klass_part()->has_final_method()) {
3819 // lookup a matching method in the super class hierarchy
3820 super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3821 if (super_m == NULL) {
3822 break; // didn't find any match; get out
3823 }
3824
3825 if (super_m->is_final() &&
3826 // matching method in super is final
3827 (Reflection::verify_field_access(this_klass->as_klassOop(),
3828 super_m->method_holder(),
3829 super_m->method_holder(),
3830 super_m->access_flags(), false))
3831 // this class can access super final method and therefore override
3832 ) {
3833 ResourceMark rm(THREAD);
3834 Exceptions::fthrow(
3835 THREAD_AND_LOCATION,
3836 vmSymbols::java_lang_VerifyError(),
3837 "class %s overrides final method %s.%s",
3838 this_klass->external_name(),
3839 name->as_C_string(),
3840 signature->as_C_string()
3841 );
3842 return;
3843 }
3844
3845 // continue to look from super_m's holder's super.
3846 k = instanceKlass::cast(super_m->method_holder())->super();
3847 continue;
3848 }
3849
3850 k = k->klass_part()->super();
3851 }
3852 }
3853 }
3854 }
3855
3856
3857 // assumes that this_klass is an interface
3858 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3859 assert(this_klass->is_interface(), "not an interface");
3860 objArrayHandle methods (THREAD, this_klass->methods());
3861 int num_methods = methods->length();
3862
3863 for (int index = 0; index < num_methods; index++) {
3864 methodOop m = (methodOop)methods->obj_at(index);
3865 // if m is static and not the init method, throw a verify error
3866 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3867 ResourceMark rm(THREAD);
3868 Exceptions::fthrow(
3869 THREAD_AND_LOCATION,
3870 vmSymbols::java_lang_VerifyError(),
3871 "Illegal static method %s in interface %s",
3872 m->name()->as_C_string(),
3873 this_klass->external_name()
3874 );
3875 return;
3876 }
3877 }
3878 }
3879
3880 // utility methods for format checking
3881
3882 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3883 if (!_need_verify) { return; }
3884
3885 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3886 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3887 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3888 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
3889 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3890 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3891 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3892
3893 if ((is_abstract && is_final) ||
3894 (is_interface && !is_abstract) ||
3895 (is_interface && major_gte_15 && (is_super || is_enum)) ||
3896 (!is_interface && major_gte_15 && is_annotation)) {
3897 ResourceMark rm(THREAD);
3898 Exceptions::fthrow(
3899 THREAD_AND_LOCATION,
3900 vmSymbols::java_lang_ClassFormatError(),
3901 "Illegal class modifiers in class %s: 0x%X",
3902 _class_name->as_C_string(), flags
3903 );
3904 return;
3905 }
3906 }
3907
3908 bool ClassFileParser::has_illegal_visibility(jint flags) {
3909 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3910 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3911 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3912
3913 return ((is_public && is_protected) ||
3914 (is_public && is_private) ||
3915 (is_protected && is_private));
3916 }
3917
3918 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3919 u2 max_version =
3920 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3921 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3922 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3923 (major <= max_version) &&
3924 ((major != max_version) ||
3925 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3926 }
3927
3928 void ClassFileParser::verify_legal_field_modifiers(
3929 jint flags, bool is_interface, TRAPS) {
3930 if (!_need_verify) { return; }
3931
3932 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3933 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3934 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3935 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3936 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3937 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
3938 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3939 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
3940 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3941
3942 bool is_illegal = false;
3943
3944 if (is_interface) {
3945 if (!is_public || !is_static || !is_final || is_private ||
3946 is_protected || is_volatile || is_transient ||
3947 (major_gte_15 && is_enum)) {
3948 is_illegal = true;
3949 }
3950 } else { // not interface
3951 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3952 is_illegal = true;
3953 }
3954 }
3955
3956 if (is_illegal) {
3957 ResourceMark rm(THREAD);
3958 Exceptions::fthrow(
3959 THREAD_AND_LOCATION,
3960 vmSymbols::java_lang_ClassFormatError(),
3961 "Illegal field modifiers in class %s: 0x%X",
3962 _class_name->as_C_string(), flags);
3963 return;
3964 }
3965 }
3966
3967 void ClassFileParser::verify_legal_method_modifiers(
3968 jint flags, bool is_interface, Symbol* name, TRAPS) {
3969 if (!_need_verify) { return; }
3970
3971 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
3972 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
3973 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
3974 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
3975 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
3976 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
3977 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
3978 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
3979 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3980 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3981 const bool is_initializer = (name == vmSymbols::object_initializer_name());
3982
3983 bool is_illegal = false;
3984
3985 if (is_interface) {
3986 if (!is_abstract || !is_public || is_static || is_final ||
3987 is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3988 is_illegal = true;
3989 }
3990 } else { // not interface
3991 if (is_initializer) {
3992 if (is_static || is_final || is_synchronized || is_native ||
3993 is_abstract || (major_gte_15 && is_bridge)) {
3994 is_illegal = true;
3995 }
3996 } else { // not initializer
3997 if (is_abstract) {
3998 if ((is_final || is_native || is_private || is_static ||
3999 (major_gte_15 && (is_synchronized || is_strict)))) {
4000 is_illegal = true;
4001 }
4002 }
4003 if (has_illegal_visibility(flags)) {
4004 is_illegal = true;
4005 }
4006 }
4007 }
4008
4009 if (is_illegal) {
4010 ResourceMark rm(THREAD);
4011 Exceptions::fthrow(
4012 THREAD_AND_LOCATION,
4013 vmSymbols::java_lang_ClassFormatError(),
4014 "Method %s in class %s has illegal modifiers: 0x%X",
4015 name->as_C_string(), _class_name->as_C_string(), flags);
4016 return;
4017 }
4018 }
4019
4020 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4021 assert(_need_verify, "only called when _need_verify is true");
4022 int i = 0;
4023 int count = length >> 2;
4024 for (int k=0; k<count; k++) {
4025 unsigned char b0 = buffer[i];
4026 unsigned char b1 = buffer[i+1];
4027 unsigned char b2 = buffer[i+2];
4028 unsigned char b3 = buffer[i+3];
4029 // For an unsigned char v,
4030 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4031 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4032 unsigned char res = b0 | b0 - 1 |
4033 b1 | b1 - 1 |
4034 b2 | b2 - 1 |
4035 b3 | b3 - 1;
4036 if (res >= 128) break;
4037 i += 4;
4038 }
4039 for(; i < length; i++) {
4040 unsigned short c;
4041 // no embedded zeros
4042 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4043 if(buffer[i] < 128) {
4044 continue;
4045 }
4046 if ((i + 5) < length) { // see if it's legal supplementary character
4047 if (UTF8::is_supplementary_character(&buffer[i])) {
4048 c = UTF8::get_supplementary_character(&buffer[i]);
4049 i += 5;
4050 continue;
4051 }
4052 }
4053 switch (buffer[i] >> 4) {
4054 default: break;
4055 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4056 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4057 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4058 c = (buffer[i] & 0x1F) << 6;
4059 i++;
4060 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4061 c += buffer[i] & 0x3F;
4062 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4063 // for classes with major > 47, c must a null or a character in its shortest form
4064 break;
4065 }
4066 }
4067 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4068 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4069 c = (buffer[i] & 0xF) << 12;
4070 i += 2;
4071 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4072 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4073 if (_major_version <= 47 || c >= 0x800) {
4074 // for classes with major > 47, c must be in its shortest form
4075 break;
4076 }
4077 }
4078 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4079 } // end of switch
4080 } // end of for
4081 }
4082
4083 // Checks if name is a legal class name.
4084 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4085 if (!_need_verify || _relax_verify) { return; }
4086
4087 char buf[fixed_buffer_size];
4088 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4089 unsigned int length = name->utf8_length();
4090 bool legal = false;
4091
4092 if (length > 0) {
4093 char* p;
4094 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4095 p = skip_over_field_signature(bytes, false, length, CHECK);
4096 legal = (p != NULL) && ((p - bytes) == (int)length);
4097 } else if (_major_version < JAVA_1_5_VERSION) {
4098 if (bytes[0] != '<') {
4099 p = skip_over_field_name(bytes, true, length);
4100 legal = (p != NULL) && ((p - bytes) == (int)length);
4101 }
4102 } else {
4103 // 4900761: relax the constraints based on JSR202 spec
4104 // Class names may be drawn from the entire Unicode character set.
4105 // Identifiers between '/' must be unqualified names.
4106 // The utf8 string has been verified when parsing cpool entries.
4107 legal = verify_unqualified_name(bytes, length, LegalClass);
4108 }
4109 }
4110 if (!legal) {
4111 ResourceMark rm(THREAD);
4112 Exceptions::fthrow(
4113 THREAD_AND_LOCATION,
4114 vmSymbols::java_lang_ClassFormatError(),
4115 "Illegal class name \"%s\" in class file %s", bytes,
4116 _class_name->as_C_string()
4117 );
4118 return;
4119 }
4120 }
4121
4122 // Checks if name is a legal field name.
4123 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4124 if (!_need_verify || _relax_verify) { return; }
4125
4126 char buf[fixed_buffer_size];
4127 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4128 unsigned int length = name->utf8_length();
4129 bool legal = false;
4130
4131 if (length > 0) {
4132 if (_major_version < JAVA_1_5_VERSION) {
4133 if (bytes[0] != '<') {
4134 char* p = skip_over_field_name(bytes, false, length);
4135 legal = (p != NULL) && ((p - bytes) == (int)length);
4136 }
4137 } else {
4138 // 4881221: relax the constraints based on JSR202 spec
4139 legal = verify_unqualified_name(bytes, length, LegalField);
4140 }
4141 }
4142
4143 if (!legal) {
4144 ResourceMark rm(THREAD);
4145 Exceptions::fthrow(
4146 THREAD_AND_LOCATION,
4147 vmSymbols::java_lang_ClassFormatError(),
4148 "Illegal field name \"%s\" in class %s", bytes,
4149 _class_name->as_C_string()
4150 );
4151 return;
4152 }
4153 }
4154
4155 // Checks if name is a legal method name.
4156 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4157 if (!_need_verify || _relax_verify) { return; }
4158
4159 assert(name != NULL, "method name is null");
4160 char buf[fixed_buffer_size];
4161 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4162 unsigned int length = name->utf8_length();
4163 bool legal = false;
4164
4165 if (length > 0) {
4166 if (bytes[0] == '<') {
4167 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4168 legal = true;
4169 }
4170 } else if (_major_version < JAVA_1_5_VERSION) {
4171 char* p;
4172 p = skip_over_field_name(bytes, false, length);
4173 legal = (p != NULL) && ((p - bytes) == (int)length);
4174 } else {
4175 // 4881221: relax the constraints based on JSR202 spec
4176 legal = verify_unqualified_name(bytes, length, LegalMethod);
4177 }
4178 }
4179
4180 if (!legal) {
4181 ResourceMark rm(THREAD);
4182 Exceptions::fthrow(
4183 THREAD_AND_LOCATION,
4184 vmSymbols::java_lang_ClassFormatError(),
4185 "Illegal method name \"%s\" in class %s", bytes,
4186 _class_name->as_C_string()
4187 );
4188 return;
4189 }
4190 }
4191
4192
4193 // Checks if signature is a legal field signature.
4194 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4195 if (!_need_verify) { return; }
4196
4197 char buf[fixed_buffer_size];
4198 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4199 unsigned int length = signature->utf8_length();
4200 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4201
4202 if (p == NULL || (p - bytes) != (int)length) {
4203 throwIllegalSignature("Field", name, signature, CHECK);
4204 }
4205 }
4206
4207 // Checks if signature is a legal method signature.
4208 // Returns number of parameters
4209 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4210 if (!_need_verify) {
4211 // make sure caller's args_size will be less than 0 even for non-static
4212 // method so it will be recomputed in compute_size_of_parameters().
4213 return -2;
4214 }
4215
4216 unsigned int args_size = 0;
4217 char buf[fixed_buffer_size];
4218 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4219 unsigned int length = signature->utf8_length();
4220 char* nextp;
4221
4222 // The first character must be a '('
4223 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4224 length--;
4225 // Skip over legal field signatures
4226 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4227 while ((length > 0) && (nextp != NULL)) {
4228 args_size++;
4229 if (p[0] == 'J' || p[0] == 'D') {
4230 args_size++;
4231 }
4232 length -= nextp - p;
4233 p = nextp;
4234 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4235 }
4236 // The first non-signature thing better be a ')'
4237 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4238 length--;
4239 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4240 // All internal methods must return void
4241 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4242 return args_size;
4243 }
4244 } else {
4245 // Now we better just have a return value
4246 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4247 if (nextp && ((int)length == (nextp - p))) {
4248 return args_size;
4249 }
4250 }
4251 }
4252 }
4253 // Report error
4254 throwIllegalSignature("Method", name, signature, CHECK_0);
4255 return 0;
4256 }
4257
4258
4259 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4260 // Method names also may not contain the characters '<' or '>', unless <init>
4261 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4262 // method. Because these names have been checked as special cases before
4263 // calling this method in verify_legal_method_name.
4264 bool ClassFileParser::verify_unqualified_name(
4265 char* name, unsigned int length, int type) {
4266 jchar ch;
4267
4268 for (char* p = name; p != name + length; ) {
4269 ch = *p;
4270 if (ch < 128) {
4271 p++;
4272 if (ch == '.' || ch == ';' || ch == '[' ) {
4273 return false; // do not permit '.', ';', or '['
4274 }
4275 if (type != LegalClass && ch == '/') {
4276 return false; // do not permit '/' unless it's class name
4277 }
4278 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4279 return false; // do not permit '<' or '>' in method names
4280 }
4281 } else {
4282 char* tmp_p = UTF8::next(p, &ch);
4283 p = tmp_p;
4284 }
4285 }
4286 return true;
4287 }
4288
4289
4290 // Take pointer to a string. Skip over the longest part of the string that could
4291 // be taken as a fieldname. Allow '/' if slash_ok is true.
4292 // Return a pointer to just past the fieldname.
4293 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4294 // being true, we saw consecutive slashes (meaning we were looking for a
4295 // qualified path but found something that was badly-formed).
4296 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4297 char* p;
4298 jchar ch;
4299 jboolean last_is_slash = false;
4300 jboolean not_first_ch = false;
4301
4302 for (p = name; p != name + length; not_first_ch = true) {
4303 char* old_p = p;
4304 ch = *p;
4305 if (ch < 128) {
4306 p++;
4307 // quick check for ascii
4308 if ((ch >= 'a' && ch <= 'z') ||
4309 (ch >= 'A' && ch <= 'Z') ||
4310 (ch == '_' || ch == '$') ||
4311 (not_first_ch && ch >= '0' && ch <= '9')) {
4312 last_is_slash = false;
4313 continue;
4314 }
4315 if (slash_ok && ch == '/') {
4316 if (last_is_slash) {
4317 return NULL; // Don't permit consecutive slashes
4318 }
4319 last_is_slash = true;
4320 continue;
4321 }
4322 } else {
4323 jint unicode_ch;
4324 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4325 p = tmp_p;
4326 last_is_slash = false;
4327 // Check if ch is Java identifier start or is Java identifier part
4328 // 4672820: call java.lang.Character methods directly without generating separate tables.
4329 EXCEPTION_MARK;
4330 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4331
4332 // return value
4333 JavaValue result(T_BOOLEAN);
4334 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4335 JavaCallArguments args;
4336 args.push_int(unicode_ch);
4337
4338 // public static boolean isJavaIdentifierStart(char ch);
4339 JavaCalls::call_static(&result,
4340 klass,
4341 vmSymbols::isJavaIdentifierStart_name(),
4342 vmSymbols::int_bool_signature(),
4343 &args,
4344 THREAD);
4345
4346 if (HAS_PENDING_EXCEPTION) {
4347 CLEAR_PENDING_EXCEPTION;
4348 return 0;
4349 }
4350 if (result.get_jboolean()) {
4351 continue;
4352 }
4353
4354 if (not_first_ch) {
4355 // public static boolean isJavaIdentifierPart(char ch);
4356 JavaCalls::call_static(&result,
4357 klass,
4358 vmSymbols::isJavaIdentifierPart_name(),
4359 vmSymbols::int_bool_signature(),
4360 &args,
4361 THREAD);
4362
4363 if (HAS_PENDING_EXCEPTION) {
4364 CLEAR_PENDING_EXCEPTION;
4365 return 0;
4366 }
4367
4368 if (result.get_jboolean()) {
4369 continue;
4370 }
4371 }
4372 }
4373 return (not_first_ch) ? old_p : NULL;
4374 }
4375 return (not_first_ch) ? p : NULL;
4376 }
4377
4378
4379 // Take pointer to a string. Skip over the longest part of the string that could
4380 // be taken as a field signature. Allow "void" if void_ok.
4381 // Return a pointer to just past the signature.
4382 // Return NULL if no legal signature is found.
4383 char* ClassFileParser::skip_over_field_signature(char* signature,
4384 bool void_ok,
4385 unsigned int length,
4386 TRAPS) {
4387 unsigned int array_dim = 0;
4388 while (length > 0) {
4389 switch (signature[0]) {
4390 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4391 case JVM_SIGNATURE_BOOLEAN:
4392 case JVM_SIGNATURE_BYTE:
4393 case JVM_SIGNATURE_CHAR:
4394 case JVM_SIGNATURE_SHORT:
4395 case JVM_SIGNATURE_INT:
4396 case JVM_SIGNATURE_FLOAT:
4397 case JVM_SIGNATURE_LONG:
4398 case JVM_SIGNATURE_DOUBLE:
4399 return signature + 1;
4400 case JVM_SIGNATURE_CLASS: {
4401 if (_major_version < JAVA_1_5_VERSION) {
4402 // Skip over the class name if one is there
4403 char* p = skip_over_field_name(signature + 1, true, --length);
4404
4405 // The next character better be a semicolon
4406 if (p && (p - signature) > 1 && p[0] == ';') {
4407 return p + 1;
4408 }
4409 } else {
4410 // 4900761: For class version > 48, any unicode is allowed in class name.
4411 length--;
4412 signature++;
4413 while (length > 0 && signature[0] != ';') {
4414 if (signature[0] == '.') {
4415 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4416 }
4417 length--;
4418 signature++;
4419 }
4420 if (signature[0] == ';') { return signature + 1; }
4421 }
4422
4423 return NULL;
4424 }
4425 case JVM_SIGNATURE_ARRAY:
4426 array_dim++;
4427 if (array_dim > 255) {
4428 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4429 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4430 }
4431 // The rest of what's there better be a legal signature
4432 signature++;
4433 length--;
4434 void_ok = false;
4435 break;
4436
4437 default:
4438 return NULL;
4439 }
4440 }
4441 return NULL;
4442 }
--- EOF ---