Wed, 10 Apr 2013 13:27:35 +0200
8010196: NPG: Internal Error: Metaspace allocation lock -- possible deadlock
Summary: Refactor the CLD dependency list into a separate class. Use an ObjectLocker to synchronize additions to the CLD dependency list.
Reviewed-by: stefank, coleenp
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/genericSignatures.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/verificationType.hpp"
36 #include "classfile/verifier.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "memory/allocation.hpp"
39 #include "memory/gcLocker.hpp"
40 #include "memory/metadataFactory.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/instanceMirrorKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/klassVtable.hpp"
49 #include "oops/method.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvm.h"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/perfData.hpp"
56 #include "runtime/reflection.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/classLoadingService.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/array.hpp"
62 #include "utilities/globalDefinitions.hpp"
64 // We generally try to create the oops directly when parsing, rather than
65 // allocating temporary data structures and copying the bytes twice. A
66 // temporary area is only needed when parsing utf8 entries in the constant
67 // pool and when parsing line number tables.
69 // We add assert in debug mode when class format is not checked.
71 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
72 #define JAVA_MIN_SUPPORTED_VERSION 45
73 #define JAVA_MAX_SUPPORTED_VERSION 52
74 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
76 // Used for two backward compatibility reasons:
77 // - to check for new additions to the class file format in JDK1.5
78 // - to check for bug fixes in the format checker in JDK1.5
79 #define JAVA_1_5_VERSION 49
81 // Used for backward compatibility reasons:
82 // - to check for javac bug fixes that happened after 1.5
83 // - also used as the max version when running in jdk6
84 #define JAVA_6_VERSION 50
86 // Used for backward compatibility reasons:
87 // - to check NameAndType_info signatures more aggressively
88 #define JAVA_7_VERSION 51
90 // Extension method support.
91 #define JAVA_8_VERSION 52
93 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
94 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
95 // this function (_current can be allocated in a register, with scalar
96 // replacement of aggregates). The _current pointer is copied back to
97 // stream() when this function returns. DON'T call another method within
98 // this method that uses stream().
99 ClassFileStream* cfs0 = stream();
100 ClassFileStream cfs1 = *cfs0;
101 ClassFileStream* cfs = &cfs1;
102 #ifdef ASSERT
103 assert(cfs->allocated_on_stack(),"should be local");
104 u1* old_current = cfs0->current();
105 #endif
106 Handle class_loader(THREAD, _loader_data->class_loader());
108 // Used for batching symbol allocations.
109 const char* names[SymbolTable::symbol_alloc_batch_size];
110 int lengths[SymbolTable::symbol_alloc_batch_size];
111 int indices[SymbolTable::symbol_alloc_batch_size];
112 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
113 int names_count = 0;
115 // parsing Index 0 is unused
116 for (int index = 1; index < length; index++) {
117 // Each of the following case guarantees one more byte in the stream
118 // for the following tag or the access_flags following constant pool,
119 // so we don't need bounds-check for reading tag.
120 u1 tag = cfs->get_u1_fast();
121 switch (tag) {
122 case JVM_CONSTANT_Class :
123 {
124 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
125 u2 name_index = cfs->get_u2_fast();
126 _cp->klass_index_at_put(index, name_index);
127 }
128 break;
129 case JVM_CONSTANT_Fieldref :
130 {
131 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
132 u2 class_index = cfs->get_u2_fast();
133 u2 name_and_type_index = cfs->get_u2_fast();
134 _cp->field_at_put(index, class_index, name_and_type_index);
135 }
136 break;
137 case JVM_CONSTANT_Methodref :
138 {
139 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
140 u2 class_index = cfs->get_u2_fast();
141 u2 name_and_type_index = cfs->get_u2_fast();
142 _cp->method_at_put(index, class_index, name_and_type_index);
143 }
144 break;
145 case JVM_CONSTANT_InterfaceMethodref :
146 {
147 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
148 u2 class_index = cfs->get_u2_fast();
149 u2 name_and_type_index = cfs->get_u2_fast();
150 _cp->interface_method_at_put(index, class_index, name_and_type_index);
151 }
152 break;
153 case JVM_CONSTANT_String :
154 {
155 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
156 u2 string_index = cfs->get_u2_fast();
157 _cp->string_index_at_put(index, string_index);
158 }
159 break;
160 case JVM_CONSTANT_MethodHandle :
161 case JVM_CONSTANT_MethodType :
162 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
163 classfile_parse_error(
164 "Class file version does not support constant tag %u in class file %s",
165 tag, CHECK);
166 }
167 if (!EnableInvokeDynamic) {
168 classfile_parse_error(
169 "This JVM does not support constant tag %u in class file %s",
170 tag, CHECK);
171 }
172 if (tag == JVM_CONSTANT_MethodHandle) {
173 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
174 u1 ref_kind = cfs->get_u1_fast();
175 u2 method_index = cfs->get_u2_fast();
176 _cp->method_handle_index_at_put(index, ref_kind, method_index);
177 } else if (tag == JVM_CONSTANT_MethodType) {
178 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
179 u2 signature_index = cfs->get_u2_fast();
180 _cp->method_type_index_at_put(index, signature_index);
181 } else {
182 ShouldNotReachHere();
183 }
184 break;
185 case JVM_CONSTANT_InvokeDynamic :
186 {
187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
188 classfile_parse_error(
189 "Class file version does not support constant tag %u in class file %s",
190 tag, CHECK);
191 }
192 if (!EnableInvokeDynamic) {
193 classfile_parse_error(
194 "This JVM does not support constant tag %u in class file %s",
195 tag, CHECK);
196 }
197 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
198 u2 bootstrap_specifier_index = cfs->get_u2_fast();
199 u2 name_and_type_index = cfs->get_u2_fast();
200 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
201 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
202 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
203 }
204 break;
205 case JVM_CONSTANT_Integer :
206 {
207 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
208 u4 bytes = cfs->get_u4_fast();
209 _cp->int_at_put(index, (jint) bytes);
210 }
211 break;
212 case JVM_CONSTANT_Float :
213 {
214 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
215 u4 bytes = cfs->get_u4_fast();
216 _cp->float_at_put(index, *(jfloat*)&bytes);
217 }
218 break;
219 case JVM_CONSTANT_Long :
220 // A mangled type might cause you to overrun allocated memory
221 guarantee_property(index+1 < length,
222 "Invalid constant pool entry %u in class file %s",
223 index, CHECK);
224 {
225 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
226 u8 bytes = cfs->get_u8_fast();
227 _cp->long_at_put(index, bytes);
228 }
229 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
230 break;
231 case JVM_CONSTANT_Double :
232 // A mangled type might cause you to overrun allocated memory
233 guarantee_property(index+1 < length,
234 "Invalid constant pool entry %u in class file %s",
235 index, CHECK);
236 {
237 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
238 u8 bytes = cfs->get_u8_fast();
239 _cp->double_at_put(index, *(jdouble*)&bytes);
240 }
241 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
242 break;
243 case JVM_CONSTANT_NameAndType :
244 {
245 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
246 u2 name_index = cfs->get_u2_fast();
247 u2 signature_index = cfs->get_u2_fast();
248 _cp->name_and_type_at_put(index, name_index, signature_index);
249 }
250 break;
251 case JVM_CONSTANT_Utf8 :
252 {
253 cfs->guarantee_more(2, CHECK); // utf8_length
254 u2 utf8_length = cfs->get_u2_fast();
255 u1* utf8_buffer = cfs->get_u1_buffer();
256 assert(utf8_buffer != NULL, "null utf8 buffer");
257 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
258 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
259 cfs->skip_u1_fast(utf8_length);
261 // Before storing the symbol, make sure it's legal
262 if (_need_verify) {
263 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
264 }
266 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
267 Handle patch = clear_cp_patch_at(index);
268 guarantee_property(java_lang_String::is_instance(patch()),
269 "Illegal utf8 patch at %d in class file %s",
270 index, CHECK);
271 char* str = java_lang_String::as_utf8_string(patch());
272 // (could use java_lang_String::as_symbol instead, but might as well batch them)
273 utf8_buffer = (u1*) str;
274 utf8_length = (int) strlen(str);
275 }
277 unsigned int hash;
278 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
279 if (result == NULL) {
280 names[names_count] = (char*)utf8_buffer;
281 lengths[names_count] = utf8_length;
282 indices[names_count] = index;
283 hashValues[names_count++] = hash;
284 if (names_count == SymbolTable::symbol_alloc_batch_size) {
285 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
286 names_count = 0;
287 }
288 } else {
289 _cp->symbol_at_put(index, result);
290 }
291 }
292 break;
293 default:
294 classfile_parse_error(
295 "Unknown constant tag %u in class file %s", tag, CHECK);
296 break;
297 }
298 }
300 // Allocate the remaining symbols
301 if (names_count > 0) {
302 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
303 }
305 // Copy _current pointer of local copy back to stream().
306 #ifdef ASSERT
307 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
308 #endif
309 cfs0->set_current(cfs1.current());
310 }
312 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
314 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
315 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
316 return cp->symbol_at(index);
317 else
318 return NULL;
319 }
321 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
322 ClassFileStream* cfs = stream();
323 constantPoolHandle nullHandle;
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 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
331 CHECK_(nullHandle));
332 _cp = constant_pool; // save in case of errors
333 constantPoolHandle cp (THREAD, constant_pool);
335 // parsing constant pool entries
336 parse_constant_pool_entries(length, CHECK_(nullHandle));
338 int index = 1; // declared outside of loops for portability
340 // first verification pass - validate cross references and fixup class and string constants
341 for (index = 1; index < length; index++) { // Index 0 is unused
342 jbyte tag = cp->tag_at(index).value();
343 switch (tag) {
344 case JVM_CONSTANT_Class :
345 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
346 break;
347 case JVM_CONSTANT_Fieldref :
348 // fall through
349 case JVM_CONSTANT_Methodref :
350 // fall through
351 case JVM_CONSTANT_InterfaceMethodref : {
352 if (!_need_verify) break;
353 int klass_ref_index = cp->klass_ref_index_at(index);
354 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
355 check_property(valid_klass_reference_at(klass_ref_index),
356 "Invalid constant pool index %u in class file %s",
357 klass_ref_index,
358 CHECK_(nullHandle));
359 check_property(valid_cp_range(name_and_type_ref_index, length) &&
360 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
361 "Invalid constant pool index %u in class file %s",
362 name_and_type_ref_index,
363 CHECK_(nullHandle));
364 break;
365 }
366 case JVM_CONSTANT_String :
367 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
368 break;
369 case JVM_CONSTANT_Integer :
370 break;
371 case JVM_CONSTANT_Float :
372 break;
373 case JVM_CONSTANT_Long :
374 case JVM_CONSTANT_Double :
375 index++;
376 check_property(
377 (index < length && cp->tag_at(index).is_invalid()),
378 "Improper constant pool long/double index %u in class file %s",
379 index, CHECK_(nullHandle));
380 break;
381 case JVM_CONSTANT_NameAndType : {
382 if (!_need_verify) break;
383 int name_ref_index = cp->name_ref_index_at(index);
384 int signature_ref_index = cp->signature_ref_index_at(index);
385 check_property(valid_symbol_at(name_ref_index),
386 "Invalid constant pool index %u in class file %s",
387 name_ref_index, CHECK_(nullHandle));
388 check_property(valid_symbol_at(signature_ref_index),
389 "Invalid constant pool index %u in class file %s",
390 signature_ref_index, CHECK_(nullHandle));
391 break;
392 }
393 case JVM_CONSTANT_Utf8 :
394 break;
395 case JVM_CONSTANT_UnresolvedClass : // fall-through
396 case JVM_CONSTANT_UnresolvedClassInError:
397 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
398 break;
399 case JVM_CONSTANT_ClassIndex :
400 {
401 int class_index = cp->klass_index_at(index);
402 check_property(valid_symbol_at(class_index),
403 "Invalid constant pool index %u in class file %s",
404 class_index, CHECK_(nullHandle));
405 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
406 }
407 break;
408 case JVM_CONSTANT_StringIndex :
409 {
410 int string_index = cp->string_index_at(index);
411 check_property(valid_symbol_at(string_index),
412 "Invalid constant pool index %u in class file %s",
413 string_index, CHECK_(nullHandle));
414 Symbol* sym = cp->symbol_at(string_index);
415 cp->unresolved_string_at_put(index, sym);
416 }
417 break;
418 case JVM_CONSTANT_MethodHandle :
419 {
420 int ref_index = cp->method_handle_index_at(index);
421 check_property(
422 valid_cp_range(ref_index, length) &&
423 EnableInvokeDynamic,
424 "Invalid constant pool index %u in class file %s",
425 ref_index, CHECK_(nullHandle));
426 constantTag tag = cp->tag_at(ref_index);
427 int ref_kind = cp->method_handle_ref_kind_at(index);
428 switch (ref_kind) {
429 case JVM_REF_getField:
430 case JVM_REF_getStatic:
431 case JVM_REF_putField:
432 case JVM_REF_putStatic:
433 check_property(
434 tag.is_field(),
435 "Invalid constant pool index %u in class file %s (not a field)",
436 ref_index, CHECK_(nullHandle));
437 break;
438 case JVM_REF_invokeVirtual:
439 case JVM_REF_invokeStatic:
440 case JVM_REF_invokeSpecial:
441 case JVM_REF_newInvokeSpecial:
442 check_property(
443 tag.is_method(),
444 "Invalid constant pool index %u in class file %s (not a method)",
445 ref_index, CHECK_(nullHandle));
446 break;
447 case JVM_REF_invokeInterface:
448 check_property(
449 tag.is_interface_method(),
450 "Invalid constant pool index %u in class file %s (not an interface method)",
451 ref_index, CHECK_(nullHandle));
452 break;
453 default:
454 classfile_parse_error(
455 "Bad method handle kind at constant pool index %u in class file %s",
456 index, CHECK_(nullHandle));
457 }
458 // Keep the ref_index unchanged. It will be indirected at link-time.
459 }
460 break;
461 case JVM_CONSTANT_MethodType :
462 {
463 int ref_index = cp->method_type_index_at(index);
464 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
465 "Invalid constant pool index %u in class file %s",
466 ref_index, CHECK_(nullHandle));
467 }
468 break;
469 case JVM_CONSTANT_InvokeDynamic :
470 {
471 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
472 check_property(valid_cp_range(name_and_type_ref_index, length) &&
473 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
474 "Invalid constant pool index %u in class file %s",
475 name_and_type_ref_index,
476 CHECK_(nullHandle));
477 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
478 break;
479 }
480 default:
481 fatal(err_msg("bad constant pool tag value %u",
482 cp->tag_at(index).value()));
483 ShouldNotReachHere();
484 break;
485 } // end of switch
486 } // end of for
488 if (_cp_patches != NULL) {
489 // need to treat this_class specially...
490 assert(EnableInvokeDynamic, "");
491 int this_class_index;
492 {
493 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
494 u1* mark = cfs->current();
495 u2 flags = cfs->get_u2_fast();
496 this_class_index = cfs->get_u2_fast();
497 cfs->set_current(mark); // revert to mark
498 }
500 for (index = 1; index < length; index++) { // Index 0 is unused
501 if (has_cp_patch_at(index)) {
502 guarantee_property(index != this_class_index,
503 "Illegal constant pool patch to self at %d in class file %s",
504 index, CHECK_(nullHandle));
505 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
506 }
507 }
508 }
510 if (!_need_verify) {
511 return cp;
512 }
514 // second verification pass - checks the strings are of the right format.
515 // but not yet to the other entries
516 for (index = 1; index < length; index++) {
517 jbyte tag = cp->tag_at(index).value();
518 switch (tag) {
519 case JVM_CONSTANT_UnresolvedClass: {
520 Symbol* class_name = cp->unresolved_klass_at(index);
521 // check the name, even if _cp_patches will overwrite it
522 verify_legal_class_name(class_name, CHECK_(nullHandle));
523 break;
524 }
525 case JVM_CONSTANT_NameAndType: {
526 if (_need_verify && _major_version >= JAVA_7_VERSION) {
527 int sig_index = cp->signature_ref_index_at(index);
528 int name_index = cp->name_ref_index_at(index);
529 Symbol* name = cp->symbol_at(name_index);
530 Symbol* sig = cp->symbol_at(sig_index);
531 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
532 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
533 } else {
534 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
535 }
536 }
537 break;
538 }
539 case JVM_CONSTANT_InvokeDynamic:
540 case JVM_CONSTANT_Fieldref:
541 case JVM_CONSTANT_Methodref:
542 case JVM_CONSTANT_InterfaceMethodref: {
543 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
544 // already verified to be utf8
545 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
546 // already verified to be utf8
547 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
548 Symbol* name = cp->symbol_at(name_ref_index);
549 Symbol* signature = cp->symbol_at(signature_ref_index);
550 if (tag == JVM_CONSTANT_Fieldref) {
551 verify_legal_field_name(name, CHECK_(nullHandle));
552 if (_need_verify && _major_version >= JAVA_7_VERSION) {
553 // Signature is verified above, when iterating NameAndType_info.
554 // Need only to be sure it's the right type.
555 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
556 throwIllegalSignature(
557 "Field", name, signature, CHECK_(nullHandle));
558 }
559 } else {
560 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
561 }
562 } else {
563 verify_legal_method_name(name, CHECK_(nullHandle));
564 if (_need_verify && _major_version >= JAVA_7_VERSION) {
565 // Signature is verified above, when iterating NameAndType_info.
566 // Need only to be sure it's the right type.
567 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
568 throwIllegalSignature(
569 "Method", name, signature, CHECK_(nullHandle));
570 }
571 } else {
572 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
573 }
574 if (tag == JVM_CONSTANT_Methodref) {
575 // 4509014: If a class method name begins with '<', it must be "<init>".
576 assert(name != NULL, "method name in constant pool is null");
577 unsigned int name_len = name->utf8_length();
578 assert(name_len > 0, "bad method name"); // already verified as legal name
579 if (name->byte_at(0) == '<') {
580 if (name != vmSymbols::object_initializer_name()) {
581 classfile_parse_error(
582 "Bad method name at constant pool index %u in class file %s",
583 name_ref_index, CHECK_(nullHandle));
584 }
585 }
586 }
587 }
588 break;
589 }
590 case JVM_CONSTANT_MethodHandle: {
591 int ref_index = cp->method_handle_index_at(index);
592 int ref_kind = cp->method_handle_ref_kind_at(index);
593 switch (ref_kind) {
594 case JVM_REF_invokeVirtual:
595 case JVM_REF_invokeStatic:
596 case JVM_REF_invokeSpecial:
597 case JVM_REF_newInvokeSpecial:
598 {
599 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
600 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
601 Symbol* name = cp->symbol_at(name_ref_index);
602 if (ref_kind == JVM_REF_newInvokeSpecial) {
603 if (name != vmSymbols::object_initializer_name()) {
604 classfile_parse_error(
605 "Bad constructor name at constant pool index %u in class file %s",
606 name_ref_index, CHECK_(nullHandle));
607 }
608 } else {
609 if (name == vmSymbols::object_initializer_name()) {
610 classfile_parse_error(
611 "Bad method name at constant pool index %u in class file %s",
612 name_ref_index, CHECK_(nullHandle));
613 }
614 }
615 }
616 break;
617 // Other ref_kinds are already fully checked in previous pass.
618 }
619 break;
620 }
621 case JVM_CONSTANT_MethodType: {
622 Symbol* no_name = vmSymbols::type_name(); // place holder
623 Symbol* signature = cp->method_type_signature_at(index);
624 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
625 break;
626 }
627 case JVM_CONSTANT_Utf8: {
628 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
629 }
630 } // end of switch
631 } // end of for
633 return cp;
634 }
637 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
638 assert(EnableInvokeDynamic, "");
639 BasicType patch_type = T_VOID;
641 switch (cp->tag_at(index).value()) {
643 case JVM_CONSTANT_UnresolvedClass :
644 // Patching a class means pre-resolving it.
645 // The name in the constant pool is ignored.
646 if (java_lang_Class::is_instance(patch())) {
647 guarantee_property(!java_lang_Class::is_primitive(patch()),
648 "Illegal class patch at %d in class file %s",
649 index, CHECK);
650 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
651 } else {
652 guarantee_property(java_lang_String::is_instance(patch()),
653 "Illegal class patch at %d in class file %s",
654 index, CHECK);
655 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
656 cp->unresolved_klass_at_put(index, name);
657 }
658 break;
660 case JVM_CONSTANT_String :
661 // skip this patch and don't clear it. Needs the oop array for resolved
662 // references to be created first.
663 return;
665 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
666 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
667 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
668 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
669 patch_prim:
670 {
671 jvalue value;
672 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
673 guarantee_property(value_type == patch_type,
674 "Illegal primitive patch at %d in class file %s",
675 index, CHECK);
676 switch (value_type) {
677 case T_INT: cp->int_at_put(index, value.i); break;
678 case T_FLOAT: cp->float_at_put(index, value.f); break;
679 case T_LONG: cp->long_at_put(index, value.j); break;
680 case T_DOUBLE: cp->double_at_put(index, value.d); break;
681 default: assert(false, "");
682 }
683 }
684 break;
686 default:
687 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
688 guarantee_property(!has_cp_patch_at(index),
689 "Illegal unexpected patch at %d in class file %s",
690 index, CHECK);
691 return;
692 }
694 // On fall-through, mark the patch as used.
695 clear_cp_patch_at(index);
696 }
700 class NameSigHash: public ResourceObj {
701 public:
702 Symbol* _name; // name
703 Symbol* _sig; // signature
704 NameSigHash* _next; // Next entry in hash table
705 };
708 #define HASH_ROW_SIZE 256
710 unsigned int hash(Symbol* name, Symbol* sig) {
711 unsigned int raw_hash = 0;
712 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
713 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
715 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
716 }
719 void initialize_hashtable(NameSigHash** table) {
720 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
721 }
723 // Return false if the name/sig combination is found in table.
724 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
725 // The old format checker uses heap sort to find duplicates.
726 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
727 // of table since we don't expect Symbol*'s to move.
728 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
729 assert(name != NULL, "name in constant pool is NULL");
731 // First lookup for duplicates
732 int index = hash(name, sig);
733 NameSigHash* entry = table[index];
734 while (entry != NULL) {
735 if (entry->_name == name && entry->_sig == sig) {
736 return false;
737 }
738 entry = entry->_next;
739 }
741 // No duplicate is found, allocate a new entry and fill it.
742 entry = new NameSigHash();
743 entry->_name = name;
744 entry->_sig = sig;
746 // Insert into hash table
747 entry->_next = table[index];
748 table[index] = entry;
750 return true;
751 }
754 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
755 Handle protection_domain,
756 Symbol* class_name,
757 bool* has_default_methods,
758 TRAPS) {
759 if (length == 0) {
760 _local_interfaces = Universe::the_empty_klass_array();
761 } else {
762 ClassFileStream* cfs = stream();
763 assert(length > 0, "only called for length>0");
764 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
766 int index;
767 for (index = 0; index < length; index++) {
768 u2 interface_index = cfs->get_u2(CHECK_NULL);
769 KlassHandle interf;
770 check_property(
771 valid_klass_reference_at(interface_index),
772 "Interface name has bad constant pool index %u in class file %s",
773 interface_index, CHECK_NULL);
774 if (_cp->tag_at(interface_index).is_klass()) {
775 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
776 } else {
777 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
779 // Don't need to check legal name because it's checked when parsing constant pool.
780 // But need to make sure it's not an array type.
781 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
782 "Bad interface name in class file %s", CHECK_NULL);
783 Handle class_loader(THREAD, _loader_data->class_loader());
785 // Call resolve_super so classcircularity is checked
786 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
787 unresolved_klass, class_loader, protection_domain,
788 false, CHECK_NULL);
789 interf = KlassHandle(THREAD, k);
790 }
792 if (!interf()->is_interface()) {
793 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
794 }
795 if (InstanceKlass::cast(interf())->has_default_methods()) {
796 *has_default_methods = true;
797 }
798 _local_interfaces->at_put(index, interf());
799 }
801 if (!_need_verify || length <= 1) {
802 return _local_interfaces;
803 }
805 // Check if there's any duplicates in interfaces
806 ResourceMark rm(THREAD);
807 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
808 THREAD, NameSigHash*, HASH_ROW_SIZE);
809 initialize_hashtable(interface_names);
810 bool dup = false;
811 {
812 debug_only(No_Safepoint_Verifier nsv;)
813 for (index = 0; index < length; index++) {
814 Klass* k = _local_interfaces->at(index);
815 Symbol* name = InstanceKlass::cast(k)->name();
816 // If no duplicates, add (name, NULL) in hashtable interface_names.
817 if (!put_after_lookup(name, NULL, interface_names)) {
818 dup = true;
819 break;
820 }
821 }
822 }
823 if (dup) {
824 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
825 }
826 }
827 return _local_interfaces;
828 }
831 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
832 // Make sure the constant pool entry is of a type appropriate to this field
833 guarantee_property(
834 (constantvalue_index > 0 &&
835 constantvalue_index < _cp->length()),
836 "Bad initial value index %u in ConstantValue attribute in class file %s",
837 constantvalue_index, CHECK);
838 constantTag value_type = _cp->tag_at(constantvalue_index);
839 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
840 case T_LONG:
841 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
842 break;
843 case T_FLOAT:
844 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
845 break;
846 case T_DOUBLE:
847 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
848 break;
849 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
850 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
851 break;
852 case T_OBJECT:
853 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
854 && value_type.is_string()),
855 "Bad string initial value in class file %s", CHECK);
856 break;
857 default:
858 classfile_parse_error(
859 "Unable to set initial value %u in class file %s",
860 constantvalue_index, CHECK);
861 }
862 }
865 // Parse attributes for a field.
866 void ClassFileParser::parse_field_attributes(u2 attributes_count,
867 bool is_static, u2 signature_index,
868 u2* constantvalue_index_addr,
869 bool* is_synthetic_addr,
870 u2* generic_signature_index_addr,
871 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
872 TRAPS) {
873 ClassFileStream* cfs = stream();
874 assert(attributes_count > 0, "length should be greater than 0");
875 u2 constantvalue_index = 0;
876 u2 generic_signature_index = 0;
877 bool is_synthetic = false;
878 u1* runtime_visible_annotations = NULL;
879 int runtime_visible_annotations_length = 0;
880 u1* runtime_invisible_annotations = NULL;
881 int runtime_invisible_annotations_length = 0;
882 u1* runtime_visible_type_annotations = NULL;
883 int runtime_visible_type_annotations_length = 0;
884 u1* runtime_invisible_type_annotations = NULL;
885 int runtime_invisible_type_annotations_length = 0;
886 while (attributes_count--) {
887 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
888 u2 attribute_name_index = cfs->get_u2_fast();
889 u4 attribute_length = cfs->get_u4_fast();
890 check_property(valid_symbol_at(attribute_name_index),
891 "Invalid field attribute index %u in class file %s",
892 attribute_name_index,
893 CHECK);
894 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
895 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
896 // ignore if non-static
897 if (constantvalue_index != 0) {
898 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
899 }
900 check_property(
901 attribute_length == 2,
902 "Invalid ConstantValue field attribute length %u in class file %s",
903 attribute_length, CHECK);
904 constantvalue_index = cfs->get_u2(CHECK);
905 if (_need_verify) {
906 verify_constantvalue(constantvalue_index, signature_index, CHECK);
907 }
908 } else if (attribute_name == vmSymbols::tag_synthetic()) {
909 if (attribute_length != 0) {
910 classfile_parse_error(
911 "Invalid Synthetic field attribute length %u in class file %s",
912 attribute_length, CHECK);
913 }
914 is_synthetic = true;
915 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
916 if (attribute_length != 0) {
917 classfile_parse_error(
918 "Invalid Deprecated field attribute length %u in class file %s",
919 attribute_length, CHECK);
920 }
921 } else if (_major_version >= JAVA_1_5_VERSION) {
922 if (attribute_name == vmSymbols::tag_signature()) {
923 if (attribute_length != 2) {
924 classfile_parse_error(
925 "Wrong size %u for field's Signature attribute in class file %s",
926 attribute_length, CHECK);
927 }
928 generic_signature_index = cfs->get_u2(CHECK);
929 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
930 runtime_visible_annotations_length = attribute_length;
931 runtime_visible_annotations = cfs->get_u1_buffer();
932 assert(runtime_visible_annotations != NULL, "null visible annotations");
933 parse_annotations(runtime_visible_annotations,
934 runtime_visible_annotations_length,
935 parsed_annotations,
936 CHECK);
937 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
938 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
939 runtime_invisible_annotations_length = attribute_length;
940 runtime_invisible_annotations = cfs->get_u1_buffer();
941 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
942 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
943 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
944 runtime_visible_type_annotations_length = attribute_length;
945 runtime_visible_type_annotations = cfs->get_u1_buffer();
946 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
947 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
948 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
949 runtime_invisible_type_annotations_length = attribute_length;
950 runtime_invisible_type_annotations = cfs->get_u1_buffer();
951 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
952 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
953 } else {
954 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
955 }
956 } else {
957 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
958 }
959 }
961 *constantvalue_index_addr = constantvalue_index;
962 *is_synthetic_addr = is_synthetic;
963 *generic_signature_index_addr = generic_signature_index;
964 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
965 runtime_visible_annotations_length,
966 runtime_invisible_annotations,
967 runtime_invisible_annotations_length,
968 CHECK);
969 parsed_annotations->set_field_annotations(a);
970 a = assemble_annotations(runtime_visible_type_annotations,
971 runtime_visible_type_annotations_length,
972 runtime_invisible_type_annotations,
973 runtime_invisible_type_annotations_length,
974 CHECK);
975 parsed_annotations->set_field_type_annotations(a);
976 return;
977 }
980 // Field allocation types. Used for computing field offsets.
982 enum FieldAllocationType {
983 STATIC_OOP, // Oops
984 STATIC_BYTE, // Boolean, Byte, char
985 STATIC_SHORT, // shorts
986 STATIC_WORD, // ints
987 STATIC_DOUBLE, // aligned long or double
988 NONSTATIC_OOP,
989 NONSTATIC_BYTE,
990 NONSTATIC_SHORT,
991 NONSTATIC_WORD,
992 NONSTATIC_DOUBLE,
993 MAX_FIELD_ALLOCATION_TYPE,
994 BAD_ALLOCATION_TYPE = -1
995 };
997 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
998 BAD_ALLOCATION_TYPE, // 0
999 BAD_ALLOCATION_TYPE, // 1
1000 BAD_ALLOCATION_TYPE, // 2
1001 BAD_ALLOCATION_TYPE, // 3
1002 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1003 NONSTATIC_SHORT, // T_CHAR = 5,
1004 NONSTATIC_WORD, // T_FLOAT = 6,
1005 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1006 NONSTATIC_BYTE, // T_BYTE = 8,
1007 NONSTATIC_SHORT, // T_SHORT = 9,
1008 NONSTATIC_WORD, // T_INT = 10,
1009 NONSTATIC_DOUBLE, // T_LONG = 11,
1010 NONSTATIC_OOP, // T_OBJECT = 12,
1011 NONSTATIC_OOP, // T_ARRAY = 13,
1012 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1013 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1014 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1015 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1016 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1017 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1018 BAD_ALLOCATION_TYPE, // 0
1019 BAD_ALLOCATION_TYPE, // 1
1020 BAD_ALLOCATION_TYPE, // 2
1021 BAD_ALLOCATION_TYPE, // 3
1022 STATIC_BYTE , // T_BOOLEAN = 4,
1023 STATIC_SHORT, // T_CHAR = 5,
1024 STATIC_WORD, // T_FLOAT = 6,
1025 STATIC_DOUBLE, // T_DOUBLE = 7,
1026 STATIC_BYTE, // T_BYTE = 8,
1027 STATIC_SHORT, // T_SHORT = 9,
1028 STATIC_WORD, // T_INT = 10,
1029 STATIC_DOUBLE, // T_LONG = 11,
1030 STATIC_OOP, // T_OBJECT = 12,
1031 STATIC_OOP, // T_ARRAY = 13,
1032 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1033 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1034 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1035 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1036 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1037 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1038 };
1040 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1041 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1042 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1043 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1044 return result;
1045 }
1047 class FieldAllocationCount: public ResourceObj {
1048 public:
1049 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1051 FieldAllocationCount() {
1052 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1053 count[i] = 0;
1054 }
1055 }
1057 FieldAllocationType update(bool is_static, BasicType type) {
1058 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1059 // Make sure there is no overflow with injected fields.
1060 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1061 count[atype]++;
1062 return atype;
1063 }
1064 };
1066 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1067 bool is_interface,
1068 FieldAllocationCount *fac,
1069 u2* java_fields_count_ptr, TRAPS) {
1070 ClassFileStream* cfs = stream();
1071 cfs->guarantee_more(2, CHECK_NULL); // length
1072 u2 length = cfs->get_u2_fast();
1073 *java_fields_count_ptr = length;
1075 int num_injected = 0;
1076 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1077 int total_fields = length + num_injected;
1079 // The field array starts with tuples of shorts
1080 // [access, name index, sig index, initial value index, byte offset].
1081 // A generic signature slot only exists for field with generic
1082 // signature attribute. And the access flag is set with
1083 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1084 // signature slots are at the end of the field array and after all
1085 // other fields data.
1086 //
1087 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1088 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1089 // ...
1090 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1091 // [generic signature index]
1092 // [generic signature index]
1093 // ...
1094 //
1095 // Allocate a temporary resource array for field data. For each field,
1096 // a slot is reserved in the temporary array for the generic signature
1097 // index. After parsing all fields, the data are copied to a permanent
1098 // array and any unused slots will be discarded.
1099 ResourceMark rm(THREAD);
1100 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1101 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1103 // The generic signature slots start after all other fields' data.
1104 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1105 int num_generic_signature = 0;
1106 for (int n = 0; n < length; n++) {
1107 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1109 AccessFlags access_flags;
1110 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1111 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1112 access_flags.set_flags(flags);
1114 u2 name_index = cfs->get_u2_fast();
1115 int cp_size = _cp->length();
1116 check_property(valid_symbol_at(name_index),
1117 "Invalid constant pool index %u for field name in class file %s",
1118 name_index,
1119 CHECK_NULL);
1120 Symbol* name = _cp->symbol_at(name_index);
1121 verify_legal_field_name(name, CHECK_NULL);
1123 u2 signature_index = cfs->get_u2_fast();
1124 check_property(valid_symbol_at(signature_index),
1125 "Invalid constant pool index %u for field signature in class file %s",
1126 signature_index, CHECK_NULL);
1127 Symbol* sig = _cp->symbol_at(signature_index);
1128 verify_legal_field_signature(name, sig, CHECK_NULL);
1130 u2 constantvalue_index = 0;
1131 bool is_synthetic = false;
1132 u2 generic_signature_index = 0;
1133 bool is_static = access_flags.is_static();
1134 FieldAnnotationCollector parsed_annotations(_loader_data);
1136 u2 attributes_count = cfs->get_u2_fast();
1137 if (attributes_count > 0) {
1138 parse_field_attributes(attributes_count, is_static, signature_index,
1139 &constantvalue_index, &is_synthetic,
1140 &generic_signature_index, &parsed_annotations,
1141 CHECK_NULL);
1142 if (parsed_annotations.field_annotations() != NULL) {
1143 if (_fields_annotations == NULL) {
1144 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1145 _loader_data, length, NULL,
1146 CHECK_NULL);
1147 }
1148 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1149 parsed_annotations.set_field_annotations(NULL);
1150 }
1151 if (parsed_annotations.field_type_annotations() != NULL) {
1152 if (_fields_type_annotations == NULL) {
1153 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1154 _loader_data, length, NULL,
1155 CHECK_NULL);
1156 }
1157 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1158 parsed_annotations.set_field_type_annotations(NULL);
1159 }
1161 if (is_synthetic) {
1162 access_flags.set_is_synthetic();
1163 }
1164 if (generic_signature_index != 0) {
1165 access_flags.set_field_has_generic_signature();
1166 fa[generic_signature_slot] = generic_signature_index;
1167 generic_signature_slot ++;
1168 num_generic_signature ++;
1169 }
1170 }
1172 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1173 field->initialize(access_flags.as_short(),
1174 name_index,
1175 signature_index,
1176 constantvalue_index);
1177 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1179 // Remember how many oops we encountered and compute allocation type
1180 FieldAllocationType atype = fac->update(is_static, type);
1181 field->set_allocation_type(atype);
1183 // After field is initialized with type, we can augment it with aux info
1184 if (parsed_annotations.has_any_annotations())
1185 parsed_annotations.apply_to(field);
1186 }
1188 int index = length;
1189 if (num_injected != 0) {
1190 for (int n = 0; n < num_injected; n++) {
1191 // Check for duplicates
1192 if (injected[n].may_be_java) {
1193 Symbol* name = injected[n].name();
1194 Symbol* signature = injected[n].signature();
1195 bool duplicate = false;
1196 for (int i = 0; i < length; i++) {
1197 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1198 if (name == _cp->symbol_at(f->name_index()) &&
1199 signature == _cp->symbol_at(f->signature_index())) {
1200 // Symbol is desclared in Java so skip this one
1201 duplicate = true;
1202 break;
1203 }
1204 }
1205 if (duplicate) {
1206 // These will be removed from the field array at the end
1207 continue;
1208 }
1209 }
1211 // Injected field
1212 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1213 field->initialize(JVM_ACC_FIELD_INTERNAL,
1214 injected[n].name_index,
1215 injected[n].signature_index,
1216 0);
1218 BasicType type = FieldType::basic_type(injected[n].signature());
1220 // Remember how many oops we encountered and compute allocation type
1221 FieldAllocationType atype = fac->update(false, type);
1222 field->set_allocation_type(atype);
1223 index++;
1224 }
1225 }
1227 // Now copy the fields' data from the temporary resource array.
1228 // Sometimes injected fields already exist in the Java source so
1229 // the fields array could be too long. In that case the
1230 // fields array is trimed. Also unused slots that were reserved
1231 // for generic signature indexes are discarded.
1232 Array<u2>* fields = MetadataFactory::new_array<u2>(
1233 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1234 CHECK_NULL);
1235 _fields = fields; // save in case of error
1236 {
1237 int i = 0;
1238 for (; i < index * FieldInfo::field_slots; i++) {
1239 fields->at_put(i, fa[i]);
1240 }
1241 for (int j = total_fields * FieldInfo::field_slots;
1242 j < generic_signature_slot; j++) {
1243 fields->at_put(i++, fa[j]);
1244 }
1245 assert(i == fields->length(), "");
1246 }
1248 if (_need_verify && length > 1) {
1249 // Check duplicated fields
1250 ResourceMark rm(THREAD);
1251 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1252 THREAD, NameSigHash*, HASH_ROW_SIZE);
1253 initialize_hashtable(names_and_sigs);
1254 bool dup = false;
1255 {
1256 debug_only(No_Safepoint_Verifier nsv;)
1257 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1258 Symbol* name = fs.name();
1259 Symbol* sig = fs.signature();
1260 // If no duplicates, add name/signature in hashtable names_and_sigs.
1261 if (!put_after_lookup(name, sig, names_and_sigs)) {
1262 dup = true;
1263 break;
1264 }
1265 }
1266 }
1267 if (dup) {
1268 classfile_parse_error("Duplicate field name&signature in class file %s",
1269 CHECK_NULL);
1270 }
1271 }
1273 return fields;
1274 }
1277 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1278 while (length-- > 0) {
1279 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1280 }
1281 }
1284 u2* ClassFileParser::parse_exception_table(u4 code_length,
1285 u4 exception_table_length,
1286 TRAPS) {
1287 ClassFileStream* cfs = stream();
1289 u2* exception_table_start = cfs->get_u2_buffer();
1290 assert(exception_table_start != NULL, "null exception table");
1291 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1292 // Will check legal target after parsing code array in verifier.
1293 if (_need_verify) {
1294 for (unsigned int i = 0; i < exception_table_length; i++) {
1295 u2 start_pc = cfs->get_u2_fast();
1296 u2 end_pc = cfs->get_u2_fast();
1297 u2 handler_pc = cfs->get_u2_fast();
1298 u2 catch_type_index = cfs->get_u2_fast();
1299 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1300 "Illegal exception table range in class file %s",
1301 CHECK_NULL);
1302 guarantee_property(handler_pc < code_length,
1303 "Illegal exception table handler in class file %s",
1304 CHECK_NULL);
1305 if (catch_type_index != 0) {
1306 guarantee_property(valid_klass_reference_at(catch_type_index),
1307 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1308 }
1309 }
1310 } else {
1311 cfs->skip_u2_fast(exception_table_length * 4);
1312 }
1313 return exception_table_start;
1314 }
1316 void ClassFileParser::parse_linenumber_table(
1317 u4 code_attribute_length, u4 code_length,
1318 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1319 ClassFileStream* cfs = stream();
1320 unsigned int num_entries = cfs->get_u2(CHECK);
1322 // Each entry is a u2 start_pc, and a u2 line_number
1323 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1325 // Verify line number attribute and table length
1326 check_property(
1327 code_attribute_length == sizeof(u2) + length_in_bytes,
1328 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1330 cfs->guarantee_more(length_in_bytes, CHECK);
1332 if ((*write_stream) == NULL) {
1333 if (length_in_bytes > fixed_buffer_size) {
1334 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1335 } else {
1336 (*write_stream) = new CompressedLineNumberWriteStream(
1337 linenumbertable_buffer, fixed_buffer_size);
1338 }
1339 }
1341 while (num_entries-- > 0) {
1342 u2 bci = cfs->get_u2_fast(); // start_pc
1343 u2 line = cfs->get_u2_fast(); // line_number
1344 guarantee_property(bci < code_length,
1345 "Invalid pc in LineNumberTable in class file %s", CHECK);
1346 (*write_stream)->write_pair(bci, line);
1347 }
1348 }
1351 // Class file LocalVariableTable elements.
1352 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1353 public:
1354 u2 start_bci;
1355 u2 length;
1356 u2 name_cp_index;
1357 u2 descriptor_cp_index;
1358 u2 slot;
1359 };
1362 class LVT_Hash: public CHeapObj<mtClass> {
1363 public:
1364 LocalVariableTableElement *_elem; // element
1365 LVT_Hash* _next; // Next entry in hash table
1366 };
1368 unsigned int hash(LocalVariableTableElement *elem) {
1369 unsigned int raw_hash = elem->start_bci;
1371 raw_hash = elem->length + raw_hash * 37;
1372 raw_hash = elem->name_cp_index + raw_hash * 37;
1373 raw_hash = elem->slot + raw_hash * 37;
1375 return raw_hash % HASH_ROW_SIZE;
1376 }
1378 void initialize_hashtable(LVT_Hash** table) {
1379 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1380 table[i] = NULL;
1381 }
1382 }
1384 void clear_hashtable(LVT_Hash** table) {
1385 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1386 LVT_Hash* current = table[i];
1387 LVT_Hash* next;
1388 while (current != NULL) {
1389 next = current->_next;
1390 current->_next = NULL;
1391 delete(current);
1392 current = next;
1393 }
1394 table[i] = NULL;
1395 }
1396 }
1398 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1399 LVT_Hash* entry = table[index];
1401 /*
1402 * 3-tuple start_bci/length/slot has to be unique key,
1403 * so the following comparison seems to be redundant:
1404 * && elem->name_cp_index == entry->_elem->name_cp_index
1405 */
1406 while (entry != NULL) {
1407 if (elem->start_bci == entry->_elem->start_bci
1408 && elem->length == entry->_elem->length
1409 && elem->name_cp_index == entry->_elem->name_cp_index
1410 && elem->slot == entry->_elem->slot
1411 ) {
1412 return entry;
1413 }
1414 entry = entry->_next;
1415 }
1416 return NULL;
1417 }
1419 // Return false if the local variable is found in table.
1420 // Return true if no duplicate is found.
1421 // And local variable is added as a new entry in table.
1422 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1423 // First lookup for duplicates
1424 int index = hash(elem);
1425 LVT_Hash* entry = LVT_lookup(elem, index, table);
1427 if (entry != NULL) {
1428 return false;
1429 }
1430 // No duplicate is found, allocate a new entry and fill it.
1431 if ((entry = new LVT_Hash()) == NULL) {
1432 return false;
1433 }
1434 entry->_elem = elem;
1436 // Insert into hash table
1437 entry->_next = table[index];
1438 table[index] = entry;
1440 return true;
1441 }
1443 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1444 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1445 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1446 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1447 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1448 lvt->signature_cp_index = 0;
1449 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1450 }
1452 // Function is used to parse both attributes:
1453 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1454 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1455 u2 max_locals,
1456 u4 code_attribute_length,
1457 u2* localvariable_table_length,
1458 bool isLVTT,
1459 TRAPS) {
1460 ClassFileStream* cfs = stream();
1461 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1462 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1463 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1464 // Verify local variable table attribute has right length
1465 if (_need_verify) {
1466 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1467 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1468 }
1469 u2* localvariable_table_start = cfs->get_u2_buffer();
1470 assert(localvariable_table_start != NULL, "null local variable table");
1471 if (!_need_verify) {
1472 cfs->skip_u2_fast(size);
1473 } else {
1474 cfs->guarantee_more(size * 2, CHECK_NULL);
1475 for(int i = 0; i < (*localvariable_table_length); i++) {
1476 u2 start_pc = cfs->get_u2_fast();
1477 u2 length = cfs->get_u2_fast();
1478 u2 name_index = cfs->get_u2_fast();
1479 u2 descriptor_index = cfs->get_u2_fast();
1480 u2 index = cfs->get_u2_fast();
1481 // Assign to a u4 to avoid overflow
1482 u4 end_pc = (u4)start_pc + (u4)length;
1484 if (start_pc >= code_length) {
1485 classfile_parse_error(
1486 "Invalid start_pc %u in %s in class file %s",
1487 start_pc, tbl_name, CHECK_NULL);
1488 }
1489 if (end_pc > code_length) {
1490 classfile_parse_error(
1491 "Invalid length %u in %s in class file %s",
1492 length, tbl_name, CHECK_NULL);
1493 }
1494 int cp_size = _cp->length();
1495 guarantee_property(valid_symbol_at(name_index),
1496 "Name index %u in %s has bad constant type in class file %s",
1497 name_index, tbl_name, CHECK_NULL);
1498 guarantee_property(valid_symbol_at(descriptor_index),
1499 "Signature index %u in %s has bad constant type in class file %s",
1500 descriptor_index, tbl_name, CHECK_NULL);
1502 Symbol* name = _cp->symbol_at(name_index);
1503 Symbol* sig = _cp->symbol_at(descriptor_index);
1504 verify_legal_field_name(name, CHECK_NULL);
1505 u2 extra_slot = 0;
1506 if (!isLVTT) {
1507 verify_legal_field_signature(name, sig, CHECK_NULL);
1509 // 4894874: check special cases for double and long local variables
1510 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1511 sig == vmSymbols::type_signature(T_LONG)) {
1512 extra_slot = 1;
1513 }
1514 }
1515 guarantee_property((index + extra_slot) < max_locals,
1516 "Invalid index %u in %s in class file %s",
1517 index, tbl_name, CHECK_NULL);
1518 }
1519 }
1520 return localvariable_table_start;
1521 }
1524 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1525 u1* u1_array, u2* u2_array, TRAPS) {
1526 ClassFileStream* cfs = stream();
1527 u2 index = 0; // index in the array with long/double occupying two slots
1528 u4 i1 = *u1_index;
1529 u4 i2 = *u2_index + 1;
1530 for(int i = 0; i < array_length; i++) {
1531 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1532 index++;
1533 if (tag == ITEM_Long || tag == ITEM_Double) {
1534 index++;
1535 } else if (tag == ITEM_Object) {
1536 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1537 guarantee_property(valid_klass_reference_at(class_index),
1538 "Bad class index %u in StackMap in class file %s",
1539 class_index, CHECK);
1540 } else if (tag == ITEM_Uninitialized) {
1541 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1542 guarantee_property(
1543 offset < code_length,
1544 "Bad uninitialized type offset %u in StackMap in class file %s",
1545 offset, CHECK);
1546 } else {
1547 guarantee_property(
1548 tag <= (u1)ITEM_Uninitialized,
1549 "Unknown variable type %u in StackMap in class file %s",
1550 tag, CHECK);
1551 }
1552 }
1553 u2_array[*u2_index] = index;
1554 *u1_index = i1;
1555 *u2_index = i2;
1556 }
1558 u1* ClassFileParser::parse_stackmap_table(
1559 u4 code_attribute_length, TRAPS) {
1560 if (code_attribute_length == 0)
1561 return NULL;
1563 ClassFileStream* cfs = stream();
1564 u1* stackmap_table_start = cfs->get_u1_buffer();
1565 assert(stackmap_table_start != NULL, "null stackmap table");
1567 // check code_attribute_length first
1568 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1570 if (!_need_verify && !DumpSharedSpaces) {
1571 return NULL;
1572 }
1573 return stackmap_table_start;
1574 }
1576 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1577 u4 method_attribute_length,
1578 TRAPS) {
1579 ClassFileStream* cfs = stream();
1580 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1581 *checked_exceptions_length = cfs->get_u2_fast();
1582 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1583 u2* checked_exceptions_start = cfs->get_u2_buffer();
1584 assert(checked_exceptions_start != NULL, "null checked exceptions");
1585 if (!_need_verify) {
1586 cfs->skip_u2_fast(size);
1587 } else {
1588 // Verify each value in the checked exception table
1589 u2 checked_exception;
1590 u2 len = *checked_exceptions_length;
1591 cfs->guarantee_more(2 * len, CHECK_NULL);
1592 for (int i = 0; i < len; i++) {
1593 checked_exception = cfs->get_u2_fast();
1594 check_property(
1595 valid_klass_reference_at(checked_exception),
1596 "Exception name has bad type at constant pool %u in class file %s",
1597 checked_exception, CHECK_NULL);
1598 }
1599 }
1600 // check exceptions attribute length
1601 if (_need_verify) {
1602 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1603 sizeof(u2) * size),
1604 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1605 }
1606 return checked_exceptions_start;
1607 }
1609 void ClassFileParser::throwIllegalSignature(
1610 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1611 ResourceMark rm(THREAD);
1612 Exceptions::fthrow(THREAD_AND_LOCATION,
1613 vmSymbols::java_lang_ClassFormatError(),
1614 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1615 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1616 }
1618 // Skip an annotation. Return >=limit if there is any problem.
1619 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1620 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1621 // value := switch (tag:u1) { ... }
1622 index += 2; // skip atype
1623 if ((index += 2) >= limit) return limit; // read nmem
1624 int nmem = Bytes::get_Java_u2(buffer+index-2);
1625 while (--nmem >= 0 && index < limit) {
1626 index += 2; // skip member
1627 index = skip_annotation_value(buffer, limit, index);
1628 }
1629 return index;
1630 }
1632 // Skip an annotation value. Return >=limit if there is any problem.
1633 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1634 // value := switch (tag:u1) {
1635 // case B, C, I, S, Z, D, F, J, c: con:u2;
1636 // case e: e_class:u2 e_name:u2;
1637 // case s: s_con:u2;
1638 // case [: do(nval:u2) {value};
1639 // case @: annotation;
1640 // case s: s_con:u2;
1641 // }
1642 if ((index += 1) >= limit) return limit; // read tag
1643 u1 tag = buffer[index-1];
1644 switch (tag) {
1645 case 'B': case 'C': case 'I': case 'S': case 'Z':
1646 case 'D': case 'F': case 'J': case 'c': case 's':
1647 index += 2; // skip con or s_con
1648 break;
1649 case 'e':
1650 index += 4; // skip e_class, e_name
1651 break;
1652 case '[':
1653 {
1654 if ((index += 2) >= limit) return limit; // read nval
1655 int nval = Bytes::get_Java_u2(buffer+index-2);
1656 while (--nval >= 0 && index < limit) {
1657 index = skip_annotation_value(buffer, limit, index);
1658 }
1659 }
1660 break;
1661 case '@':
1662 index = skip_annotation(buffer, limit, index);
1663 break;
1664 default:
1665 assert(false, "annotation tag");
1666 return limit; // bad tag byte
1667 }
1668 return index;
1669 }
1671 // Sift through annotations, looking for those significant to the VM:
1672 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1673 ClassFileParser::AnnotationCollector* coll,
1674 TRAPS) {
1675 // annotations := do(nann:u2) {annotation}
1676 int index = 0;
1677 if ((index += 2) >= limit) return; // read nann
1678 int nann = Bytes::get_Java_u2(buffer+index-2);
1679 enum { // initial annotation layout
1680 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1681 count_off = 2, // u2 such as 1 (one value)
1682 member_off = 4, // utf8 such as 'value'
1683 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1684 e_tag_val = 'e',
1685 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1686 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1687 e_size = 11, // end of 'e' annotation
1688 c_tag_val = 'c', // payload is type
1689 c_con_off = 7, // utf8 payload, such as 'I'
1690 c_size = 9, // end of 'c' annotation
1691 s_tag_val = 's', // payload is String
1692 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1693 s_size = 9,
1694 min_size = 6 // smallest possible size (zero members)
1695 };
1696 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1697 int index0 = index;
1698 index = skip_annotation(buffer, limit, index);
1699 u1* abase = buffer + index0;
1700 int atype = Bytes::get_Java_u2(abase + atype_off);
1701 int count = Bytes::get_Java_u2(abase + count_off);
1702 Symbol* aname = check_symbol_at(_cp, atype);
1703 if (aname == NULL) break; // invalid annotation name
1704 Symbol* member = NULL;
1705 if (count >= 1) {
1706 int member_index = Bytes::get_Java_u2(abase + member_off);
1707 member = check_symbol_at(_cp, member_index);
1708 if (member == NULL) break; // invalid member name
1709 }
1711 // Here is where parsing particular annotations will take place.
1712 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1713 if (id == AnnotationCollector::_unknown) continue;
1714 coll->set_annotation(id);
1716 if (id == AnnotationCollector::_sun_misc_Contended) {
1717 if (count == 1
1718 && s_size == (index - index0) // match size
1719 && s_tag_val == *(abase + tag_off)
1720 && member == vmSymbols::value_name()) {
1721 u2 group_index = Bytes::get_Java_u2(abase + s_con_off);
1722 coll->set_contended_group(group_index);
1723 } else {
1724 coll->set_contended_group(0); // default contended group
1725 }
1726 coll->set_contended(true);
1727 } else {
1728 coll->set_contended(false);
1729 }
1730 }
1731 }
1733 ClassFileParser::AnnotationCollector::ID
1734 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1735 Symbol* name) {
1736 vmSymbols::SID sid = vmSymbols::find_sid(name);
1737 // Privileged code can use all annotations. Other code silently drops some.
1738 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1739 loader_data->is_ext_class_loader_data() ||
1740 loader_data->is_anonymous();
1741 switch (sid) {
1742 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1743 if (_location != _in_method) break; // only allow for methods
1744 if (!privileged) break; // only allow in privileged code
1745 return _method_CallerSensitive;
1746 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1747 if (_location != _in_method) break; // only allow for methods
1748 if (!privileged) break; // only allow in privileged code
1749 return _method_ForceInline;
1750 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1751 if (_location != _in_method) break; // only allow for methods
1752 if (!privileged) break; // only allow in privileged code
1753 return _method_DontInline;
1754 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1755 if (_location != _in_method) break; // only allow for methods
1756 if (!privileged) break; // only allow in privileged code
1757 return _method_LambdaForm_Compiled;
1758 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1759 if (_location != _in_method) break; // only allow for methods
1760 if (!privileged) break; // only allow in privileged code
1761 return _method_LambdaForm_Hidden;
1762 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1763 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1764 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1765 return _sun_misc_Contended;
1766 default: break;
1767 }
1768 return AnnotationCollector::_unknown;
1769 }
1771 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1772 if (is_contended())
1773 f->set_contended_group(contended_group());
1774 }
1776 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1777 // If there's an error deallocate metadata for field annotations
1778 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1779 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1780 }
1782 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1783 if (has_annotation(_method_CallerSensitive))
1784 m->set_caller_sensitive(true);
1785 if (has_annotation(_method_ForceInline))
1786 m->set_force_inline(true);
1787 if (has_annotation(_method_DontInline))
1788 m->set_dont_inline(true);
1789 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1790 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1791 if (has_annotation(_method_LambdaForm_Hidden))
1792 m->set_hidden(true);
1793 }
1795 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1796 k->set_is_contended(is_contended());
1797 }
1800 #define MAX_ARGS_SIZE 255
1801 #define MAX_CODE_SIZE 65535
1802 #define INITIAL_MAX_LVT_NUMBER 256
1804 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1805 *
1806 * Rules for LVT's and LVTT's are:
1807 * - There can be any number of LVT's and LVTT's.
1808 * - If there are n LVT's, it is the same as if there was just
1809 * one LVT containing all the entries from the n LVT's.
1810 * - There may be no more than one LVT entry per local variable.
1811 * Two LVT entries are 'equal' if these fields are the same:
1812 * start_pc, length, name, slot
1813 * - There may be no more than one LVTT entry per each LVT entry.
1814 * Each LVTT entry has to match some LVT entry.
1815 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1816 */
1817 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1818 int lvt_cnt,
1819 u2* localvariable_table_length,
1820 u2** localvariable_table_start,
1821 int lvtt_cnt,
1822 u2* localvariable_type_table_length,
1823 u2** localvariable_type_table_start,
1824 TRAPS) {
1826 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1827 initialize_hashtable(lvt_Hash);
1829 // To fill LocalVariableTable in
1830 Classfile_LVT_Element* cf_lvt;
1831 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1833 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1834 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1835 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1836 copy_lvt_element(&cf_lvt[idx], lvt);
1837 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1838 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1839 && _need_verify
1840 && _major_version >= JAVA_1_5_VERSION) {
1841 clear_hashtable(lvt_Hash);
1842 classfile_parse_error("Duplicated LocalVariableTable attribute "
1843 "entry for '%s' in class file %s",
1844 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1845 CHECK);
1846 }
1847 }
1848 }
1850 // To merge LocalVariableTable and LocalVariableTypeTable
1851 Classfile_LVT_Element* cf_lvtt;
1852 LocalVariableTableElement lvtt_elem;
1854 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1855 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1856 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1857 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1858 int index = hash(&lvtt_elem);
1859 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1860 if (entry == NULL) {
1861 if (_need_verify) {
1862 clear_hashtable(lvt_Hash);
1863 classfile_parse_error("LVTT entry for '%s' in class file %s "
1864 "does not match any LVT entry",
1865 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1866 CHECK);
1867 }
1868 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1869 clear_hashtable(lvt_Hash);
1870 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1871 "entry for '%s' in class file %s",
1872 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1873 CHECK);
1874 } else {
1875 // to add generic signatures into LocalVariableTable
1876 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1877 }
1878 }
1879 }
1880 clear_hashtable(lvt_Hash);
1881 }
1884 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1885 u1* runtime_visible_annotations,
1886 int runtime_visible_annotations_length,
1887 u1* runtime_invisible_annotations,
1888 int runtime_invisible_annotations_length,
1889 u1* runtime_visible_parameter_annotations,
1890 int runtime_visible_parameter_annotations_length,
1891 u1* runtime_invisible_parameter_annotations,
1892 int runtime_invisible_parameter_annotations_length,
1893 u1* runtime_visible_type_annotations,
1894 int runtime_visible_type_annotations_length,
1895 u1* runtime_invisible_type_annotations,
1896 int runtime_invisible_type_annotations_length,
1897 u1* annotation_default,
1898 int annotation_default_length,
1899 TRAPS) {
1901 AnnotationArray* a;
1903 if (runtime_visible_annotations_length +
1904 runtime_invisible_annotations_length > 0) {
1905 a = assemble_annotations(runtime_visible_annotations,
1906 runtime_visible_annotations_length,
1907 runtime_invisible_annotations,
1908 runtime_invisible_annotations_length,
1909 CHECK);
1910 cm->set_method_annotations(a);
1911 }
1913 if (runtime_visible_parameter_annotations_length +
1914 runtime_invisible_parameter_annotations_length > 0) {
1915 a = assemble_annotations(runtime_visible_parameter_annotations,
1916 runtime_visible_parameter_annotations_length,
1917 runtime_invisible_parameter_annotations,
1918 runtime_invisible_parameter_annotations_length,
1919 CHECK);
1920 cm->set_parameter_annotations(a);
1921 }
1923 if (annotation_default_length > 0) {
1924 a = assemble_annotations(annotation_default,
1925 annotation_default_length,
1926 NULL,
1927 0,
1928 CHECK);
1929 cm->set_default_annotations(a);
1930 }
1932 if (runtime_visible_type_annotations_length +
1933 runtime_invisible_type_annotations_length > 0) {
1934 a = assemble_annotations(runtime_visible_type_annotations,
1935 runtime_visible_type_annotations_length,
1936 runtime_invisible_type_annotations,
1937 runtime_invisible_type_annotations_length,
1938 CHECK);
1939 cm->set_type_annotations(a);
1940 }
1941 }
1944 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1945 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1946 // Method* to save footprint, so we only know the size of the resulting Method* when the
1947 // entire method attribute is parsed.
1948 //
1949 // The promoted_flags parameter is used to pass relevant access_flags
1950 // from the method back up to the containing klass. These flag values
1951 // are added to klass's access_flags.
1953 methodHandle ClassFileParser::parse_method(bool is_interface,
1954 AccessFlags *promoted_flags,
1955 TRAPS) {
1956 ClassFileStream* cfs = stream();
1957 methodHandle nullHandle;
1958 ResourceMark rm(THREAD);
1959 // Parse fixed parts
1960 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1962 int flags = cfs->get_u2_fast();
1963 u2 name_index = cfs->get_u2_fast();
1964 int cp_size = _cp->length();
1965 check_property(
1966 valid_symbol_at(name_index),
1967 "Illegal constant pool index %u for method name in class file %s",
1968 name_index, CHECK_(nullHandle));
1969 Symbol* name = _cp->symbol_at(name_index);
1970 verify_legal_method_name(name, CHECK_(nullHandle));
1972 u2 signature_index = cfs->get_u2_fast();
1973 guarantee_property(
1974 valid_symbol_at(signature_index),
1975 "Illegal constant pool index %u for method signature in class file %s",
1976 signature_index, CHECK_(nullHandle));
1977 Symbol* signature = _cp->symbol_at(signature_index);
1979 AccessFlags access_flags;
1980 if (name == vmSymbols::class_initializer_name()) {
1981 // We ignore the other access flags for a valid class initializer.
1982 // (JVM Spec 2nd ed., chapter 4.6)
1983 if (_major_version < 51) { // backward compatibility
1984 flags = JVM_ACC_STATIC;
1985 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1986 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1987 }
1988 } else {
1989 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1990 }
1992 int args_size = -1; // only used when _need_verify is true
1993 if (_need_verify) {
1994 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1995 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1996 if (args_size > MAX_ARGS_SIZE) {
1997 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1998 }
1999 }
2001 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2003 // Default values for code and exceptions attribute elements
2004 u2 max_stack = 0;
2005 u2 max_locals = 0;
2006 u4 code_length = 0;
2007 u1* code_start = 0;
2008 u2 exception_table_length = 0;
2009 u2* exception_table_start = NULL;
2010 Array<int>* exception_handlers = Universe::the_empty_int_array();
2011 u2 checked_exceptions_length = 0;
2012 u2* checked_exceptions_start = NULL;
2013 CompressedLineNumberWriteStream* linenumber_table = NULL;
2014 int linenumber_table_length = 0;
2015 int total_lvt_length = 0;
2016 u2 lvt_cnt = 0;
2017 u2 lvtt_cnt = 0;
2018 bool lvt_allocated = false;
2019 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2020 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2021 u2* localvariable_table_length;
2022 u2** localvariable_table_start;
2023 u2* localvariable_type_table_length;
2024 u2** localvariable_type_table_start;
2025 u2 method_parameters_length = 0;
2026 u1* method_parameters_data = NULL;
2027 bool method_parameters_seen = false;
2028 bool method_parameters_four_byte_flags;
2029 bool parsed_code_attribute = false;
2030 bool parsed_checked_exceptions_attribute = false;
2031 bool parsed_stackmap_attribute = false;
2032 // stackmap attribute - JDK1.5
2033 u1* stackmap_data = NULL;
2034 int stackmap_data_length = 0;
2035 u2 generic_signature_index = 0;
2036 MethodAnnotationCollector parsed_annotations;
2037 u1* runtime_visible_annotations = NULL;
2038 int runtime_visible_annotations_length = 0;
2039 u1* runtime_invisible_annotations = NULL;
2040 int runtime_invisible_annotations_length = 0;
2041 u1* runtime_visible_parameter_annotations = NULL;
2042 int runtime_visible_parameter_annotations_length = 0;
2043 u1* runtime_invisible_parameter_annotations = NULL;
2044 int runtime_invisible_parameter_annotations_length = 0;
2045 u1* runtime_visible_type_annotations = NULL;
2046 int runtime_visible_type_annotations_length = 0;
2047 u1* runtime_invisible_type_annotations = NULL;
2048 int runtime_invisible_type_annotations_length = 0;
2049 u1* annotation_default = NULL;
2050 int annotation_default_length = 0;
2052 // Parse code and exceptions attribute
2053 u2 method_attributes_count = cfs->get_u2_fast();
2054 while (method_attributes_count--) {
2055 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2056 u2 method_attribute_name_index = cfs->get_u2_fast();
2057 u4 method_attribute_length = cfs->get_u4_fast();
2058 check_property(
2059 valid_symbol_at(method_attribute_name_index),
2060 "Invalid method attribute name index %u in class file %s",
2061 method_attribute_name_index, CHECK_(nullHandle));
2063 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2064 if (method_attribute_name == vmSymbols::tag_code()) {
2065 // Parse Code attribute
2066 if (_need_verify) {
2067 guarantee_property(
2068 !access_flags.is_native() && !access_flags.is_abstract(),
2069 "Code attribute in native or abstract methods in class file %s",
2070 CHECK_(nullHandle));
2071 }
2072 if (parsed_code_attribute) {
2073 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2074 }
2075 parsed_code_attribute = true;
2077 // Stack size, locals size, and code size
2078 if (_major_version == 45 && _minor_version <= 2) {
2079 cfs->guarantee_more(4, CHECK_(nullHandle));
2080 max_stack = cfs->get_u1_fast();
2081 max_locals = cfs->get_u1_fast();
2082 code_length = cfs->get_u2_fast();
2083 } else {
2084 cfs->guarantee_more(8, CHECK_(nullHandle));
2085 max_stack = cfs->get_u2_fast();
2086 max_locals = cfs->get_u2_fast();
2087 code_length = cfs->get_u4_fast();
2088 }
2089 if (_need_verify) {
2090 guarantee_property(args_size <= max_locals,
2091 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2092 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2093 "Invalid method Code length %u in class file %s",
2094 code_length, CHECK_(nullHandle));
2095 }
2096 // Code pointer
2097 code_start = cfs->get_u1_buffer();
2098 assert(code_start != NULL, "null code start");
2099 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2100 cfs->skip_u1_fast(code_length);
2102 // Exception handler table
2103 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2104 exception_table_length = cfs->get_u2_fast();
2105 if (exception_table_length > 0) {
2106 exception_table_start =
2107 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2108 }
2110 // Parse additional attributes in code attribute
2111 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2112 u2 code_attributes_count = cfs->get_u2_fast();
2114 unsigned int calculated_attribute_length = 0;
2116 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2117 calculated_attribute_length =
2118 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2119 } else {
2120 // max_stack, locals and length are smaller in pre-version 45.2 classes
2121 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2122 }
2123 calculated_attribute_length +=
2124 code_length +
2125 sizeof(exception_table_length) +
2126 sizeof(code_attributes_count) +
2127 exception_table_length *
2128 ( sizeof(u2) + // start_pc
2129 sizeof(u2) + // end_pc
2130 sizeof(u2) + // handler_pc
2131 sizeof(u2) ); // catch_type_index
2133 while (code_attributes_count--) {
2134 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2135 u2 code_attribute_name_index = cfs->get_u2_fast();
2136 u4 code_attribute_length = cfs->get_u4_fast();
2137 calculated_attribute_length += code_attribute_length +
2138 sizeof(code_attribute_name_index) +
2139 sizeof(code_attribute_length);
2140 check_property(valid_symbol_at(code_attribute_name_index),
2141 "Invalid code attribute name index %u in class file %s",
2142 code_attribute_name_index,
2143 CHECK_(nullHandle));
2144 if (LoadLineNumberTables &&
2145 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2146 // Parse and compress line number table
2147 parse_linenumber_table(code_attribute_length, code_length,
2148 &linenumber_table, CHECK_(nullHandle));
2150 } else if (LoadLocalVariableTables &&
2151 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2152 // Parse local variable table
2153 if (!lvt_allocated) {
2154 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2155 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2156 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2157 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2158 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2159 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2160 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2161 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2162 lvt_allocated = true;
2163 }
2164 if (lvt_cnt == max_lvt_cnt) {
2165 max_lvt_cnt <<= 1;
2166 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2167 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2168 }
2169 localvariable_table_start[lvt_cnt] =
2170 parse_localvariable_table(code_length,
2171 max_locals,
2172 code_attribute_length,
2173 &localvariable_table_length[lvt_cnt],
2174 false, // is not LVTT
2175 CHECK_(nullHandle));
2176 total_lvt_length += localvariable_table_length[lvt_cnt];
2177 lvt_cnt++;
2178 } else if (LoadLocalVariableTypeTables &&
2179 _major_version >= JAVA_1_5_VERSION &&
2180 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2181 if (!lvt_allocated) {
2182 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2183 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2184 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2185 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2186 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2187 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2188 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2189 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2190 lvt_allocated = true;
2191 }
2192 // Parse local variable type table
2193 if (lvtt_cnt == max_lvtt_cnt) {
2194 max_lvtt_cnt <<= 1;
2195 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2196 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2197 }
2198 localvariable_type_table_start[lvtt_cnt] =
2199 parse_localvariable_table(code_length,
2200 max_locals,
2201 code_attribute_length,
2202 &localvariable_type_table_length[lvtt_cnt],
2203 true, // is LVTT
2204 CHECK_(nullHandle));
2205 lvtt_cnt++;
2206 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2207 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2208 // Stack map is only needed by the new verifier in JDK1.5.
2209 if (parsed_stackmap_attribute) {
2210 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2211 }
2212 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2213 stackmap_data_length = code_attribute_length;
2214 parsed_stackmap_attribute = true;
2215 } else {
2216 // Skip unknown attributes
2217 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2218 }
2219 }
2220 // check method attribute length
2221 if (_need_verify) {
2222 guarantee_property(method_attribute_length == calculated_attribute_length,
2223 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2224 }
2225 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2226 // Parse Exceptions attribute
2227 if (parsed_checked_exceptions_attribute) {
2228 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2229 }
2230 parsed_checked_exceptions_attribute = true;
2231 checked_exceptions_start =
2232 parse_checked_exceptions(&checked_exceptions_length,
2233 method_attribute_length,
2234 CHECK_(nullHandle));
2235 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2236 // reject multiple method parameters
2237 if (method_parameters_seen) {
2238 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2239 }
2240 method_parameters_seen = true;
2241 method_parameters_length = cfs->get_u1_fast();
2242 // Track the actual size (note: this is written for clarity; a
2243 // decent compiler will CSE and constant-fold this into a single
2244 // expression)
2245 // Use the attribute length to figure out the size of flags
2246 if (method_attribute_length == (method_parameters_length * 6u) + 1u) {
2247 method_parameters_four_byte_flags = true;
2248 } else if (method_attribute_length == (method_parameters_length * 4u) + 1u) {
2249 method_parameters_four_byte_flags = false;
2250 } else {
2251 classfile_parse_error(
2252 "Invalid MethodParameters method attribute length %u in class file",
2253 method_attribute_length, CHECK_(nullHandle));
2254 }
2255 method_parameters_data = cfs->get_u1_buffer();
2256 cfs->skip_u2_fast(method_parameters_length);
2257 if (method_parameters_four_byte_flags) {
2258 cfs->skip_u4_fast(method_parameters_length);
2259 } else {
2260 cfs->skip_u2_fast(method_parameters_length);
2261 }
2262 // ignore this attribute if it cannot be reflected
2263 if (!SystemDictionary::Parameter_klass_loaded())
2264 method_parameters_length = 0;
2265 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2266 if (method_attribute_length != 0) {
2267 classfile_parse_error(
2268 "Invalid Synthetic method attribute length %u in class file %s",
2269 method_attribute_length, CHECK_(nullHandle));
2270 }
2271 // Should we check that there hasn't already been a synthetic attribute?
2272 access_flags.set_is_synthetic();
2273 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2274 if (method_attribute_length != 0) {
2275 classfile_parse_error(
2276 "Invalid Deprecated method attribute length %u in class file %s",
2277 method_attribute_length, CHECK_(nullHandle));
2278 }
2279 } else if (_major_version >= JAVA_1_5_VERSION) {
2280 if (method_attribute_name == vmSymbols::tag_signature()) {
2281 if (method_attribute_length != 2) {
2282 classfile_parse_error(
2283 "Invalid Signature attribute length %u in class file %s",
2284 method_attribute_length, CHECK_(nullHandle));
2285 }
2286 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2287 generic_signature_index = cfs->get_u2_fast();
2288 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2289 runtime_visible_annotations_length = method_attribute_length;
2290 runtime_visible_annotations = cfs->get_u1_buffer();
2291 assert(runtime_visible_annotations != NULL, "null visible annotations");
2292 parse_annotations(runtime_visible_annotations,
2293 runtime_visible_annotations_length, &parsed_annotations,
2294 CHECK_(nullHandle));
2295 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2296 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2297 runtime_invisible_annotations_length = method_attribute_length;
2298 runtime_invisible_annotations = cfs->get_u1_buffer();
2299 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2300 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2301 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2302 runtime_visible_parameter_annotations_length = method_attribute_length;
2303 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2304 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2305 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2306 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2307 runtime_invisible_parameter_annotations_length = method_attribute_length;
2308 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2309 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2310 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2311 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2312 annotation_default_length = method_attribute_length;
2313 annotation_default = cfs->get_u1_buffer();
2314 assert(annotation_default != NULL, "null annotation default");
2315 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2316 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2317 runtime_visible_type_annotations_length = method_attribute_length;
2318 runtime_visible_type_annotations = cfs->get_u1_buffer();
2319 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2320 // No need for the VM to parse Type annotations
2321 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2322 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2323 runtime_invisible_type_annotations_length = method_attribute_length;
2324 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2325 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2326 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2327 } else {
2328 // Skip unknown attributes
2329 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2330 }
2331 } else {
2332 // Skip unknown attributes
2333 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2334 }
2335 }
2337 if (linenumber_table != NULL) {
2338 linenumber_table->write_terminator();
2339 linenumber_table_length = linenumber_table->position();
2340 }
2342 // Make sure there's at least one Code attribute in non-native/non-abstract method
2343 if (_need_verify) {
2344 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2345 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2346 }
2348 // All sizing information for a Method* is finally available, now create it
2349 InlineTableSizes sizes(
2350 total_lvt_length,
2351 linenumber_table_length,
2352 exception_table_length,
2353 checked_exceptions_length,
2354 method_parameters_length,
2355 generic_signature_index,
2356 runtime_visible_annotations_length +
2357 runtime_invisible_annotations_length,
2358 runtime_visible_parameter_annotations_length +
2359 runtime_invisible_parameter_annotations_length,
2360 runtime_visible_type_annotations_length +
2361 runtime_invisible_type_annotations_length,
2362 annotation_default_length,
2363 0);
2365 Method* m = Method::allocate(
2366 _loader_data, code_length, access_flags, &sizes,
2367 ConstMethod::NORMAL, CHECK_(nullHandle));
2369 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2371 // Fill in information from fixed part (access_flags already set)
2372 m->set_constants(_cp);
2373 m->set_name_index(name_index);
2374 m->set_signature_index(signature_index);
2375 #ifdef CC_INTERP
2376 // hmm is there a gc issue here??
2377 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2378 m->set_result_index(rtf.type());
2379 #endif
2381 if (args_size >= 0) {
2382 m->set_size_of_parameters(args_size);
2383 } else {
2384 m->compute_size_of_parameters(THREAD);
2385 }
2386 #ifdef ASSERT
2387 if (args_size >= 0) {
2388 m->compute_size_of_parameters(THREAD);
2389 assert(args_size == m->size_of_parameters(), "");
2390 }
2391 #endif
2393 // Fill in code attribute information
2394 m->set_max_stack(max_stack);
2395 m->set_max_locals(max_locals);
2396 if (stackmap_data != NULL) {
2397 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2398 stackmap_data_length, CHECK_NULL);
2399 }
2401 // Copy byte codes
2402 m->set_code(code_start);
2404 // Copy line number table
2405 if (linenumber_table != NULL) {
2406 memcpy(m->compressed_linenumber_table(),
2407 linenumber_table->buffer(), linenumber_table_length);
2408 }
2410 // Copy exception table
2411 if (exception_table_length > 0) {
2412 int size =
2413 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2414 copy_u2_with_conversion((u2*) m->exception_table_start(),
2415 exception_table_start, size);
2416 }
2418 // Copy method parameters
2419 if (method_parameters_length > 0) {
2420 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2421 for (int i = 0; i < method_parameters_length; i++) {
2422 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2423 method_parameters_data += 2;
2424 if (method_parameters_four_byte_flags) {
2425 elem[i].flags = Bytes::get_Java_u4(method_parameters_data);
2426 method_parameters_data += 4;
2427 } else {
2428 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2429 method_parameters_data += 2;
2430 }
2431 }
2432 }
2434 // Copy checked exceptions
2435 if (checked_exceptions_length > 0) {
2436 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2437 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2438 }
2440 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2441 if (total_lvt_length > 0) {
2442 promoted_flags->set_has_localvariable_table();
2443 copy_localvariable_table(m->constMethod(), lvt_cnt,
2444 localvariable_table_length,
2445 localvariable_table_start,
2446 lvtt_cnt,
2447 localvariable_type_table_length,
2448 localvariable_type_table_start, CHECK_NULL);
2449 }
2451 if (parsed_annotations.has_any_annotations())
2452 parsed_annotations.apply_to(m);
2454 // Copy annotations
2455 copy_method_annotations(m->constMethod(),
2456 runtime_visible_annotations,
2457 runtime_visible_annotations_length,
2458 runtime_invisible_annotations,
2459 runtime_invisible_annotations_length,
2460 runtime_visible_parameter_annotations,
2461 runtime_visible_parameter_annotations_length,
2462 runtime_invisible_parameter_annotations,
2463 runtime_invisible_parameter_annotations_length,
2464 runtime_visible_type_annotations,
2465 runtime_visible_type_annotations_length,
2466 runtime_invisible_type_annotations,
2467 runtime_invisible_type_annotations_length,
2468 annotation_default,
2469 annotation_default_length,
2470 CHECK_NULL);
2472 if (name == vmSymbols::finalize_method_name() &&
2473 signature == vmSymbols::void_method_signature()) {
2474 if (m->is_empty_method()) {
2475 _has_empty_finalizer = true;
2476 } else {
2477 _has_finalizer = true;
2478 }
2479 }
2480 if (name == vmSymbols::object_initializer_name() &&
2481 signature == vmSymbols::void_method_signature() &&
2482 m->is_vanilla_constructor()) {
2483 _has_vanilla_constructor = true;
2484 }
2486 NOT_PRODUCT(m->verify());
2487 return m;
2488 }
2491 // The promoted_flags parameter is used to pass relevant access_flags
2492 // from the methods back up to the containing klass. These flag values
2493 // are added to klass's access_flags.
2495 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2496 AccessFlags* promoted_flags,
2497 bool* has_final_method,
2498 bool* has_default_methods,
2499 TRAPS) {
2500 ClassFileStream* cfs = stream();
2501 cfs->guarantee_more(2, CHECK_NULL); // length
2502 u2 length = cfs->get_u2_fast();
2503 if (length == 0) {
2504 _methods = Universe::the_empty_method_array();
2505 } else {
2506 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2508 HandleMark hm(THREAD);
2509 for (int index = 0; index < length; index++) {
2510 methodHandle method = parse_method(is_interface,
2511 promoted_flags,
2512 CHECK_NULL);
2514 if (method->is_final()) {
2515 *has_final_method = true;
2516 }
2517 if (is_interface && !method->is_abstract() && !method->is_static()) {
2518 // default method
2519 *has_default_methods = true;
2520 }
2521 _methods->at_put(index, method());
2522 }
2524 if (_need_verify && length > 1) {
2525 // Check duplicated methods
2526 ResourceMark rm(THREAD);
2527 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2528 THREAD, NameSigHash*, HASH_ROW_SIZE);
2529 initialize_hashtable(names_and_sigs);
2530 bool dup = false;
2531 {
2532 debug_only(No_Safepoint_Verifier nsv;)
2533 for (int i = 0; i < length; i++) {
2534 Method* m = _methods->at(i);
2535 // If no duplicates, add name/signature in hashtable names_and_sigs.
2536 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2537 dup = true;
2538 break;
2539 }
2540 }
2541 }
2542 if (dup) {
2543 classfile_parse_error("Duplicate method name&signature in class file %s",
2544 CHECK_NULL);
2545 }
2546 }
2547 }
2548 return _methods;
2549 }
2552 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2553 int length = methods->length();
2554 // If JVMTI original method ordering or sharing is enabled we have to
2555 // remember the original class file ordering.
2556 // We temporarily use the vtable_index field in the Method* to store the
2557 // class file index, so we can read in after calling qsort.
2558 // Put the method ordering in the shared archive.
2559 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2560 for (int index = 0; index < length; index++) {
2561 Method* m = methods->at(index);
2562 assert(!m->valid_vtable_index(), "vtable index should not be set");
2563 m->set_vtable_index(index);
2564 }
2565 }
2566 // Sort method array by ascending method name (for faster lookups & vtable construction)
2567 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2568 Method::sort_methods(methods);
2570 intArray* method_ordering = NULL;
2571 // If JVMTI original method ordering or sharing is enabled construct int
2572 // array remembering the original ordering
2573 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2574 method_ordering = new intArray(length);
2575 for (int index = 0; index < length; index++) {
2576 Method* m = methods->at(index);
2577 int old_index = m->vtable_index();
2578 assert(old_index >= 0 && old_index < length, "invalid method index");
2579 method_ordering->at_put(index, old_index);
2580 m->set_vtable_index(Method::invalid_vtable_index);
2581 }
2582 }
2583 return method_ordering;
2584 }
2587 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2588 ClassFileStream* cfs = stream();
2589 cfs->guarantee_more(2, CHECK); // sourcefile_index
2590 u2 sourcefile_index = cfs->get_u2_fast();
2591 check_property(
2592 valid_symbol_at(sourcefile_index),
2593 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2594 sourcefile_index, CHECK);
2595 set_class_sourcefile(_cp->symbol_at(sourcefile_index));
2596 }
2600 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2601 ClassFileStream* cfs = stream();
2602 u1* sde_buffer = cfs->get_u1_buffer();
2603 assert(sde_buffer != NULL, "null sde buffer");
2605 // Don't bother storing it if there is no way to retrieve it
2606 if (JvmtiExport::can_get_source_debug_extension()) {
2607 assert((length+1) > length, "Overflow checking");
2608 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2609 for (int i = 0; i < length; i++) {
2610 sde[i] = sde_buffer[i];
2611 }
2612 sde[length] = '\0';
2613 set_class_sde_buffer((char*)sde, length);
2614 }
2615 // Got utf8 string, set stream position forward
2616 cfs->skip_u1(length, CHECK);
2617 }
2620 // Inner classes can be static, private or protected (classic VM does this)
2621 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2623 // Return number of classes in the inner classes attribute table
2624 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2625 bool parsed_enclosingmethod_attribute,
2626 u2 enclosing_method_class_index,
2627 u2 enclosing_method_method_index,
2628 TRAPS) {
2629 ClassFileStream* cfs = stream();
2630 u1* current_mark = cfs->current();
2631 u2 length = 0;
2632 if (inner_classes_attribute_start != NULL) {
2633 cfs->set_current(inner_classes_attribute_start);
2634 cfs->guarantee_more(2, CHECK_0); // length
2635 length = cfs->get_u2_fast();
2636 }
2638 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2639 // method data:
2640 // [inner_class_info_index,
2641 // outer_class_info_index,
2642 // inner_name_index,
2643 // inner_class_access_flags,
2644 // ...
2645 // enclosing_method_class_index,
2646 // enclosing_method_method_index]
2647 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2648 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2649 _inner_classes = inner_classes;
2651 int index = 0;
2652 int cp_size = _cp->length();
2653 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2654 for (int n = 0; n < length; n++) {
2655 // Inner class index
2656 u2 inner_class_info_index = cfs->get_u2_fast();
2657 check_property(
2658 inner_class_info_index == 0 ||
2659 valid_klass_reference_at(inner_class_info_index),
2660 "inner_class_info_index %u has bad constant type in class file %s",
2661 inner_class_info_index, CHECK_0);
2662 // Outer class index
2663 u2 outer_class_info_index = cfs->get_u2_fast();
2664 check_property(
2665 outer_class_info_index == 0 ||
2666 valid_klass_reference_at(outer_class_info_index),
2667 "outer_class_info_index %u has bad constant type in class file %s",
2668 outer_class_info_index, CHECK_0);
2669 // Inner class name
2670 u2 inner_name_index = cfs->get_u2_fast();
2671 check_property(
2672 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2673 "inner_name_index %u has bad constant type in class file %s",
2674 inner_name_index, CHECK_0);
2675 if (_need_verify) {
2676 guarantee_property(inner_class_info_index != outer_class_info_index,
2677 "Class is both outer and inner class in class file %s", CHECK_0);
2678 }
2679 // Access flags
2680 AccessFlags inner_access_flags;
2681 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2682 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2683 // Set abstract bit for old class files for backward compatibility
2684 flags |= JVM_ACC_ABSTRACT;
2685 }
2686 verify_legal_class_modifiers(flags, CHECK_0);
2687 inner_access_flags.set_flags(flags);
2689 inner_classes->at_put(index++, inner_class_info_index);
2690 inner_classes->at_put(index++, outer_class_info_index);
2691 inner_classes->at_put(index++, inner_name_index);
2692 inner_classes->at_put(index++, inner_access_flags.as_short());
2693 }
2695 // 4347400: make sure there's no duplicate entry in the classes array
2696 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2697 for(int i = 0; i < length * 4; i += 4) {
2698 for(int j = i + 4; j < length * 4; j += 4) {
2699 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2700 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2701 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2702 inner_classes->at(i+3) != inner_classes->at(j+3)),
2703 "Duplicate entry in InnerClasses in class file %s",
2704 CHECK_0);
2705 }
2706 }
2707 }
2709 // Set EnclosingMethod class and method indexes.
2710 if (parsed_enclosingmethod_attribute) {
2711 inner_classes->at_put(index++, enclosing_method_class_index);
2712 inner_classes->at_put(index++, enclosing_method_method_index);
2713 }
2714 assert(index == size, "wrong size");
2716 // Restore buffer's current position.
2717 cfs->set_current(current_mark);
2719 return length;
2720 }
2722 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2723 set_class_synthetic_flag(true);
2724 }
2726 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2727 ClassFileStream* cfs = stream();
2728 u2 signature_index = cfs->get_u2(CHECK);
2729 check_property(
2730 valid_symbol_at(signature_index),
2731 "Invalid constant pool index %u in Signature attribute in class file %s",
2732 signature_index, CHECK);
2733 set_class_generic_signature(_cp->symbol_at(signature_index));
2734 }
2736 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2737 ClassFileStream* cfs = stream();
2738 u1* current_start = cfs->current();
2740 cfs->guarantee_more(2, CHECK); // length
2741 int attribute_array_length = cfs->get_u2_fast();
2743 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2744 "Short length on BootstrapMethods in class file %s",
2745 CHECK);
2747 // The attribute contains a counted array of counted tuples of shorts,
2748 // represending bootstrap specifiers:
2749 // length*{bootstrap_method_index, argument_count*{argument_index}}
2750 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2751 // operand_count = number of shorts in attr, except for leading length
2753 // The attribute is copied into a short[] array.
2754 // The array begins with a series of short[2] pairs, one for each tuple.
2755 int index_size = (attribute_array_length * 2);
2757 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2759 // Eagerly assign operands so they will be deallocated with the constant
2760 // pool if there is an error.
2761 _cp->set_operands(operands);
2763 int operand_fill_index = index_size;
2764 int cp_size = _cp->length();
2766 for (int n = 0; n < attribute_array_length; n++) {
2767 // Store a 32-bit offset into the header of the operand array.
2768 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2770 // Read a bootstrap specifier.
2771 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2772 u2 bootstrap_method_index = cfs->get_u2_fast();
2773 u2 argument_count = cfs->get_u2_fast();
2774 check_property(
2775 valid_cp_range(bootstrap_method_index, cp_size) &&
2776 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2777 "bootstrap_method_index %u has bad constant type in class file %s",
2778 bootstrap_method_index,
2779 CHECK);
2780 operands->at_put(operand_fill_index++, bootstrap_method_index);
2781 operands->at_put(operand_fill_index++, argument_count);
2783 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2784 for (int j = 0; j < argument_count; j++) {
2785 u2 argument_index = cfs->get_u2_fast();
2786 check_property(
2787 valid_cp_range(argument_index, cp_size) &&
2788 _cp->tag_at(argument_index).is_loadable_constant(),
2789 "argument_index %u has bad constant type in class file %s",
2790 argument_index,
2791 CHECK);
2792 operands->at_put(operand_fill_index++, argument_index);
2793 }
2794 }
2796 assert(operand_fill_index == operands->length(), "exact fill");
2797 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2799 u1* current_end = cfs->current();
2800 guarantee_property(current_end == current_start + attribute_byte_length,
2801 "Bad length on BootstrapMethods in class file %s",
2802 CHECK);
2803 }
2805 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2806 TRAPS) {
2807 ClassFileStream* cfs = stream();
2808 // Set inner classes attribute to default sentinel
2809 _inner_classes = Universe::the_empty_short_array();
2810 cfs->guarantee_more(2, CHECK); // attributes_count
2811 u2 attributes_count = cfs->get_u2_fast();
2812 bool parsed_sourcefile_attribute = false;
2813 bool parsed_innerclasses_attribute = false;
2814 bool parsed_enclosingmethod_attribute = false;
2815 bool parsed_bootstrap_methods_attribute = false;
2816 u1* runtime_visible_annotations = NULL;
2817 int runtime_visible_annotations_length = 0;
2818 u1* runtime_invisible_annotations = NULL;
2819 int runtime_invisible_annotations_length = 0;
2820 u1* runtime_visible_type_annotations = NULL;
2821 int runtime_visible_type_annotations_length = 0;
2822 u1* runtime_invisible_type_annotations = NULL;
2823 int runtime_invisible_type_annotations_length = 0;
2824 u1* inner_classes_attribute_start = NULL;
2825 u4 inner_classes_attribute_length = 0;
2826 u2 enclosing_method_class_index = 0;
2827 u2 enclosing_method_method_index = 0;
2828 // Iterate over attributes
2829 while (attributes_count--) {
2830 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2831 u2 attribute_name_index = cfs->get_u2_fast();
2832 u4 attribute_length = cfs->get_u4_fast();
2833 check_property(
2834 valid_symbol_at(attribute_name_index),
2835 "Attribute name has bad constant pool index %u in class file %s",
2836 attribute_name_index, CHECK);
2837 Symbol* tag = _cp->symbol_at(attribute_name_index);
2838 if (tag == vmSymbols::tag_source_file()) {
2839 // Check for SourceFile tag
2840 if (_need_verify) {
2841 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2842 }
2843 if (parsed_sourcefile_attribute) {
2844 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2845 } else {
2846 parsed_sourcefile_attribute = true;
2847 }
2848 parse_classfile_sourcefile_attribute(CHECK);
2849 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2850 // Check for SourceDebugExtension tag
2851 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2852 } else if (tag == vmSymbols::tag_inner_classes()) {
2853 // Check for InnerClasses tag
2854 if (parsed_innerclasses_attribute) {
2855 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2856 } else {
2857 parsed_innerclasses_attribute = true;
2858 }
2859 inner_classes_attribute_start = cfs->get_u1_buffer();
2860 inner_classes_attribute_length = attribute_length;
2861 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2862 } else if (tag == vmSymbols::tag_synthetic()) {
2863 // Check for Synthetic tag
2864 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2865 if (attribute_length != 0) {
2866 classfile_parse_error(
2867 "Invalid Synthetic classfile attribute length %u in class file %s",
2868 attribute_length, CHECK);
2869 }
2870 parse_classfile_synthetic_attribute(CHECK);
2871 } else if (tag == vmSymbols::tag_deprecated()) {
2872 // Check for Deprecatd tag - 4276120
2873 if (attribute_length != 0) {
2874 classfile_parse_error(
2875 "Invalid Deprecated classfile attribute length %u in class file %s",
2876 attribute_length, CHECK);
2877 }
2878 } else if (_major_version >= JAVA_1_5_VERSION) {
2879 if (tag == vmSymbols::tag_signature()) {
2880 if (attribute_length != 2) {
2881 classfile_parse_error(
2882 "Wrong Signature attribute length %u in class file %s",
2883 attribute_length, CHECK);
2884 }
2885 parse_classfile_signature_attribute(CHECK);
2886 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2887 runtime_visible_annotations_length = attribute_length;
2888 runtime_visible_annotations = cfs->get_u1_buffer();
2889 assert(runtime_visible_annotations != NULL, "null visible annotations");
2890 parse_annotations(runtime_visible_annotations,
2891 runtime_visible_annotations_length,
2892 parsed_annotations,
2893 CHECK);
2894 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2895 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2896 runtime_invisible_annotations_length = attribute_length;
2897 runtime_invisible_annotations = cfs->get_u1_buffer();
2898 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2899 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2900 } else if (tag == vmSymbols::tag_enclosing_method()) {
2901 if (parsed_enclosingmethod_attribute) {
2902 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2903 } else {
2904 parsed_enclosingmethod_attribute = true;
2905 }
2906 cfs->guarantee_more(4, CHECK); // class_index, method_index
2907 enclosing_method_class_index = cfs->get_u2_fast();
2908 enclosing_method_method_index = cfs->get_u2_fast();
2909 if (enclosing_method_class_index == 0) {
2910 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2911 }
2912 // Validate the constant pool indices and types
2913 check_property(valid_klass_reference_at(enclosing_method_class_index),
2914 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2915 if (enclosing_method_method_index != 0 &&
2916 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2917 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2918 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2919 }
2920 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2921 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2922 if (parsed_bootstrap_methods_attribute)
2923 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2924 parsed_bootstrap_methods_attribute = true;
2925 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2926 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2927 runtime_visible_type_annotations_length = attribute_length;
2928 runtime_visible_type_annotations = cfs->get_u1_buffer();
2929 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2930 // No need for the VM to parse Type annotations
2931 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2932 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2933 runtime_invisible_type_annotations_length = attribute_length;
2934 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2935 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2936 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2937 } else {
2938 // Unknown attribute
2939 cfs->skip_u1(attribute_length, CHECK);
2940 }
2941 } else {
2942 // Unknown attribute
2943 cfs->skip_u1(attribute_length, CHECK);
2944 }
2945 }
2946 _annotations = assemble_annotations(runtime_visible_annotations,
2947 runtime_visible_annotations_length,
2948 runtime_invisible_annotations,
2949 runtime_invisible_annotations_length,
2950 CHECK);
2951 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
2952 runtime_visible_type_annotations_length,
2953 runtime_invisible_type_annotations,
2954 runtime_invisible_type_annotations_length,
2955 CHECK);
2957 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2958 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2959 inner_classes_attribute_start,
2960 parsed_innerclasses_attribute,
2961 enclosing_method_class_index,
2962 enclosing_method_method_index,
2963 CHECK);
2964 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2965 guarantee_property(
2966 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2967 "Wrong InnerClasses attribute length in class file %s", CHECK);
2968 }
2969 }
2971 if (_max_bootstrap_specifier_index >= 0) {
2972 guarantee_property(parsed_bootstrap_methods_attribute,
2973 "Missing BootstrapMethods attribute in class file %s", CHECK);
2974 }
2975 }
2977 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2978 if (_synthetic_flag)
2979 k->set_is_synthetic();
2980 if (_sourcefile != NULL) {
2981 _sourcefile->increment_refcount();
2982 k->set_source_file_name(_sourcefile);
2983 }
2984 if (_generic_signature != NULL) {
2985 _generic_signature->increment_refcount();
2986 k->set_generic_signature(_generic_signature);
2987 }
2988 if (_sde_buffer != NULL) {
2989 k->set_source_debug_extension(_sde_buffer, _sde_length);
2990 }
2991 }
2993 // Transfer ownership of metadata allocated to the InstanceKlass.
2994 void ClassFileParser::apply_parsed_class_metadata(
2995 instanceKlassHandle this_klass,
2996 int java_fields_count, TRAPS) {
2997 // Assign annotations if needed
2998 if (_annotations != NULL || _type_annotations != NULL ||
2999 _fields_annotations != NULL || _fields_type_annotations != NULL) {
3000 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3001 annotations->set_class_annotations(_annotations);
3002 annotations->set_class_type_annotations(_type_annotations);
3003 annotations->set_fields_annotations(_fields_annotations);
3004 annotations->set_fields_type_annotations(_fields_type_annotations);
3005 this_klass->set_annotations(annotations);
3006 }
3008 _cp->set_pool_holder(this_klass());
3009 this_klass->set_constants(_cp);
3010 this_klass->set_fields(_fields, java_fields_count);
3011 this_klass->set_methods(_methods);
3012 this_klass->set_inner_classes(_inner_classes);
3013 this_klass->set_local_interfaces(_local_interfaces);
3014 this_klass->set_transitive_interfaces(_transitive_interfaces);
3016 // Clear out these fields so they don't get deallocated by the destructor
3017 clear_class_metadata();
3018 }
3020 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3021 int runtime_visible_annotations_length,
3022 u1* runtime_invisible_annotations,
3023 int runtime_invisible_annotations_length, TRAPS) {
3024 AnnotationArray* annotations = NULL;
3025 if (runtime_visible_annotations != NULL ||
3026 runtime_invisible_annotations != NULL) {
3027 annotations = MetadataFactory::new_array<u1>(_loader_data,
3028 runtime_visible_annotations_length +
3029 runtime_invisible_annotations_length,
3030 CHECK_(annotations));
3031 if (runtime_visible_annotations != NULL) {
3032 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3033 annotations->at_put(i, runtime_visible_annotations[i]);
3034 }
3035 }
3036 if (runtime_invisible_annotations != NULL) {
3037 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3038 int append = runtime_visible_annotations_length+i;
3039 annotations->at_put(append, runtime_invisible_annotations[i]);
3040 }
3041 }
3042 }
3043 return annotations;
3044 }
3047 #ifndef PRODUCT
3048 static void parseAndPrintGenericSignatures(
3049 instanceKlassHandle this_klass, TRAPS) {
3050 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3051 ResourceMark rm;
3053 if (this_klass->generic_signature() != NULL) {
3054 using namespace generic;
3055 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3057 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3058 spec->print_on(tty);
3060 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3061 Method* m = this_klass->methods()->at(i);
3062 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3063 Symbol* sig = m->generic_signature();
3064 if (sig == NULL) {
3065 sig = m->signature();
3066 }
3067 tty->print_cr("Parsing %s", sig->as_C_string());
3068 method_spec->print_on(tty);
3069 }
3070 }
3071 }
3072 #endif // ndef PRODUCT
3075 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3076 TRAPS) {
3077 instanceKlassHandle super_klass;
3078 if (super_class_index == 0) {
3079 check_property(_class_name == vmSymbols::java_lang_Object(),
3080 "Invalid superclass index %u in class file %s",
3081 super_class_index,
3082 CHECK_NULL);
3083 } else {
3084 check_property(valid_klass_reference_at(super_class_index),
3085 "Invalid superclass index %u in class file %s",
3086 super_class_index,
3087 CHECK_NULL);
3088 // The class name should be legal because it is checked when parsing constant pool.
3089 // However, make sure it is not an array type.
3090 bool is_array = false;
3091 if (_cp->tag_at(super_class_index).is_klass()) {
3092 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3093 if (_need_verify)
3094 is_array = super_klass->oop_is_array();
3095 } else if (_need_verify) {
3096 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3097 }
3098 if (_need_verify) {
3099 guarantee_property(!is_array,
3100 "Bad superclass name in class file %s", CHECK_NULL);
3101 }
3102 }
3103 return super_klass;
3104 }
3107 // Values needed for oopmap and InstanceKlass creation
3108 class FieldLayoutInfo : public StackObj {
3109 public:
3110 int* nonstatic_oop_offsets;
3111 unsigned int* nonstatic_oop_counts;
3112 unsigned int nonstatic_oop_map_count;
3113 unsigned int total_oop_map_count;
3114 int instance_size;
3115 int nonstatic_field_size;
3116 int static_field_size;
3117 bool has_nonstatic_fields;
3118 };
3120 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3121 void ClassFileParser::layout_fields(Handle class_loader,
3122 FieldAllocationCount* fac,
3123 ClassAnnotationCollector* parsed_annotations,
3124 FieldLayoutInfo* info,
3125 TRAPS) {
3127 // get the padding width from the option
3128 // TODO: Ask VM about specific CPU we are running on
3129 int pad_size = ContendedPaddingWidth;
3131 // Field size and offset computation
3132 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3133 #ifndef PRODUCT
3134 int orig_nonstatic_field_size = 0;
3135 #endif
3136 int next_static_oop_offset;
3137 int next_static_double_offset;
3138 int next_static_word_offset;
3139 int next_static_short_offset;
3140 int next_static_byte_offset;
3141 int next_nonstatic_oop_offset;
3142 int next_nonstatic_double_offset;
3143 int next_nonstatic_word_offset;
3144 int next_nonstatic_short_offset;
3145 int next_nonstatic_byte_offset;
3146 int next_nonstatic_type_offset;
3147 int first_nonstatic_oop_offset;
3148 int first_nonstatic_field_offset;
3149 int next_nonstatic_field_offset;
3150 int next_nonstatic_padded_offset;
3152 // Count the contended fields by type.
3153 int nonstatic_contended_count = 0;
3154 FieldAllocationCount fac_contended;
3155 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3156 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3157 if (fs.is_contended()) {
3158 fac_contended.count[atype]++;
3159 if (!fs.access_flags().is_static()) {
3160 nonstatic_contended_count++;
3161 }
3162 }
3163 }
3164 int contended_count = nonstatic_contended_count;
3167 // Calculate the starting byte offsets
3168 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3169 next_static_double_offset = next_static_oop_offset +
3170 ((fac->count[STATIC_OOP]) * heapOopSize);
3171 if ( fac->count[STATIC_DOUBLE] &&
3172 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3173 Universe::field_type_should_be_aligned(T_LONG)) ) {
3174 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3175 }
3177 next_static_word_offset = next_static_double_offset +
3178 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3179 next_static_short_offset = next_static_word_offset +
3180 ((fac->count[STATIC_WORD]) * BytesPerInt);
3181 next_static_byte_offset = next_static_short_offset +
3182 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3184 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3185 nonstatic_field_size * heapOopSize;
3187 // class is contended, pad before all the fields
3188 if (parsed_annotations->is_contended()) {
3189 first_nonstatic_field_offset += pad_size;
3190 }
3192 next_nonstatic_field_offset = first_nonstatic_field_offset;
3194 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3195 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3196 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3197 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3198 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3200 bool super_has_nonstatic_fields =
3201 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3202 bool has_nonstatic_fields = super_has_nonstatic_fields ||
3203 ((nonstatic_double_count + nonstatic_word_count +
3204 nonstatic_short_count + nonstatic_byte_count +
3205 nonstatic_oop_count) != 0);
3208 // Prepare list of oops for oop map generation.
3209 int* nonstatic_oop_offsets;
3210 unsigned int* nonstatic_oop_counts;
3211 unsigned int nonstatic_oop_map_count = 0;
3213 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3214 THREAD, int, nonstatic_oop_count + 1);
3215 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3216 THREAD, unsigned int, nonstatic_oop_count + 1);
3218 first_nonstatic_oop_offset = 0; // will be set for first oop field
3220 #ifndef PRODUCT
3221 if( PrintCompactFieldsSavings ) {
3222 next_nonstatic_double_offset = next_nonstatic_field_offset +
3223 (nonstatic_oop_count * heapOopSize);
3224 if ( nonstatic_double_count > 0 ) {
3225 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3226 }
3227 next_nonstatic_word_offset = next_nonstatic_double_offset +
3228 (nonstatic_double_count * BytesPerLong);
3229 next_nonstatic_short_offset = next_nonstatic_word_offset +
3230 (nonstatic_word_count * BytesPerInt);
3231 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3232 (nonstatic_short_count * BytesPerShort);
3233 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset +
3234 nonstatic_byte_count ), heapOopSize );
3235 orig_nonstatic_field_size = nonstatic_field_size +
3236 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3237 }
3238 #endif
3239 bool compact_fields = CompactFields;
3240 int allocation_style = FieldsAllocationStyle;
3241 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3242 assert(false, "0 <= FieldsAllocationStyle <= 2");
3243 allocation_style = 1; // Optimistic
3244 }
3246 // The next classes have predefined hard-coded fields offsets
3247 // (see in JavaClasses::compute_hard_coded_offsets()).
3248 // Use default fields allocation order for them.
3249 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3250 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3251 _class_name == vmSymbols::java_lang_Class() ||
3252 _class_name == vmSymbols::java_lang_ClassLoader() ||
3253 _class_name == vmSymbols::java_lang_ref_Reference() ||
3254 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3255 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3256 _class_name == vmSymbols::java_lang_String() ||
3257 _class_name == vmSymbols::java_lang_Throwable() ||
3258 _class_name == vmSymbols::java_lang_Boolean() ||
3259 _class_name == vmSymbols::java_lang_Character() ||
3260 _class_name == vmSymbols::java_lang_Float() ||
3261 _class_name == vmSymbols::java_lang_Double() ||
3262 _class_name == vmSymbols::java_lang_Byte() ||
3263 _class_name == vmSymbols::java_lang_Short() ||
3264 _class_name == vmSymbols::java_lang_Integer() ||
3265 _class_name == vmSymbols::java_lang_Long())) {
3266 allocation_style = 0; // Allocate oops first
3267 compact_fields = false; // Don't compact fields
3268 }
3270 if( allocation_style == 0 ) {
3271 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3272 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3273 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3274 (nonstatic_oop_count * heapOopSize);
3275 } else if( allocation_style == 1 ) {
3276 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3277 next_nonstatic_double_offset = next_nonstatic_field_offset;
3278 } else if( allocation_style == 2 ) {
3279 // Fields allocation: oops fields in super and sub classes are together.
3280 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3281 _super_klass->nonstatic_oop_map_size() > 0 ) {
3282 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3283 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3284 OopMapBlock* last_map = first_map + map_count - 1;
3285 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3286 if (next_offset == next_nonstatic_field_offset) {
3287 allocation_style = 0; // allocate oops first
3288 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3289 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3290 (nonstatic_oop_count * heapOopSize);
3291 }
3292 }
3293 if( allocation_style == 2 ) {
3294 allocation_style = 1; // allocate oops last
3295 next_nonstatic_double_offset = next_nonstatic_field_offset;
3296 }
3297 } else {
3298 ShouldNotReachHere();
3299 }
3301 int nonstatic_oop_space_count = 0;
3302 int nonstatic_word_space_count = 0;
3303 int nonstatic_short_space_count = 0;
3304 int nonstatic_byte_space_count = 0;
3305 int nonstatic_oop_space_offset;
3306 int nonstatic_word_space_offset;
3307 int nonstatic_short_space_offset;
3308 int nonstatic_byte_space_offset;
3310 if( nonstatic_double_count > 0 ) {
3311 int offset = next_nonstatic_double_offset;
3312 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3313 if( compact_fields && offset != next_nonstatic_double_offset ) {
3314 // Allocate available fields into the gap before double field.
3315 int length = next_nonstatic_double_offset - offset;
3316 assert(length == BytesPerInt, "");
3317 nonstatic_word_space_offset = offset;
3318 if( nonstatic_word_count > 0 ) {
3319 nonstatic_word_count -= 1;
3320 nonstatic_word_space_count = 1; // Only one will fit
3321 length -= BytesPerInt;
3322 offset += BytesPerInt;
3323 }
3324 nonstatic_short_space_offset = offset;
3325 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3326 nonstatic_short_count -= 1;
3327 nonstatic_short_space_count += 1;
3328 length -= BytesPerShort;
3329 offset += BytesPerShort;
3330 }
3331 nonstatic_byte_space_offset = offset;
3332 while( length > 0 && nonstatic_byte_count > 0 ) {
3333 nonstatic_byte_count -= 1;
3334 nonstatic_byte_space_count += 1;
3335 length -= 1;
3336 }
3337 // Allocate oop field in the gap if there are no other fields for that.
3338 nonstatic_oop_space_offset = offset;
3339 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3340 allocation_style != 0 ) { // when oop fields not first
3341 nonstatic_oop_count -= 1;
3342 nonstatic_oop_space_count = 1; // Only one will fit
3343 length -= heapOopSize;
3344 offset += heapOopSize;
3345 }
3346 }
3347 }
3349 next_nonstatic_word_offset = next_nonstatic_double_offset +
3350 (nonstatic_double_count * BytesPerLong);
3351 next_nonstatic_short_offset = next_nonstatic_word_offset +
3352 (nonstatic_word_count * BytesPerInt);
3353 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3354 (nonstatic_short_count * BytesPerShort);
3355 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3356 nonstatic_byte_count;
3358 // let oops jump before padding with this allocation style
3359 if( allocation_style == 1 ) {
3360 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3361 if( nonstatic_oop_count > 0 ) {
3362 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3363 }
3364 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3365 }
3367 // Iterate over fields again and compute correct offsets.
3368 // The field allocation type was temporarily stored in the offset slot.
3369 // oop fields are located before non-oop fields (static and non-static).
3370 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3372 // skip already laid out fields
3373 if (fs.is_offset_set()) continue;
3375 // contended instance fields are handled below
3376 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3378 int real_offset;
3379 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3381 // pack the rest of the fields
3382 switch (atype) {
3383 case STATIC_OOP:
3384 real_offset = next_static_oop_offset;
3385 next_static_oop_offset += heapOopSize;
3386 break;
3387 case STATIC_BYTE:
3388 real_offset = next_static_byte_offset;
3389 next_static_byte_offset += 1;
3390 break;
3391 case STATIC_SHORT:
3392 real_offset = next_static_short_offset;
3393 next_static_short_offset += BytesPerShort;
3394 break;
3395 case STATIC_WORD:
3396 real_offset = next_static_word_offset;
3397 next_static_word_offset += BytesPerInt;
3398 break;
3399 case STATIC_DOUBLE:
3400 real_offset = next_static_double_offset;
3401 next_static_double_offset += BytesPerLong;
3402 break;
3403 case NONSTATIC_OOP:
3404 if( nonstatic_oop_space_count > 0 ) {
3405 real_offset = nonstatic_oop_space_offset;
3406 nonstatic_oop_space_offset += heapOopSize;
3407 nonstatic_oop_space_count -= 1;
3408 } else {
3409 real_offset = next_nonstatic_oop_offset;
3410 next_nonstatic_oop_offset += heapOopSize;
3411 }
3412 // Update oop maps
3413 if( nonstatic_oop_map_count > 0 &&
3414 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3415 real_offset -
3416 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3417 heapOopSize ) {
3418 // Extend current oop map
3419 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3420 } else {
3421 // Create new oop map
3422 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3423 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3424 nonstatic_oop_map_count += 1;
3425 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3426 first_nonstatic_oop_offset = real_offset;
3427 }
3428 }
3429 break;
3430 case NONSTATIC_BYTE:
3431 if( nonstatic_byte_space_count > 0 ) {
3432 real_offset = nonstatic_byte_space_offset;
3433 nonstatic_byte_space_offset += 1;
3434 nonstatic_byte_space_count -= 1;
3435 } else {
3436 real_offset = next_nonstatic_byte_offset;
3437 next_nonstatic_byte_offset += 1;
3438 }
3439 break;
3440 case NONSTATIC_SHORT:
3441 if( nonstatic_short_space_count > 0 ) {
3442 real_offset = nonstatic_short_space_offset;
3443 nonstatic_short_space_offset += BytesPerShort;
3444 nonstatic_short_space_count -= 1;
3445 } else {
3446 real_offset = next_nonstatic_short_offset;
3447 next_nonstatic_short_offset += BytesPerShort;
3448 }
3449 break;
3450 case NONSTATIC_WORD:
3451 if( nonstatic_word_space_count > 0 ) {
3452 real_offset = nonstatic_word_space_offset;
3453 nonstatic_word_space_offset += BytesPerInt;
3454 nonstatic_word_space_count -= 1;
3455 } else {
3456 real_offset = next_nonstatic_word_offset;
3457 next_nonstatic_word_offset += BytesPerInt;
3458 }
3459 break;
3460 case NONSTATIC_DOUBLE:
3461 real_offset = next_nonstatic_double_offset;
3462 next_nonstatic_double_offset += BytesPerLong;
3463 break;
3464 default:
3465 ShouldNotReachHere();
3466 }
3467 fs.set_offset(real_offset);
3468 }
3471 // Handle the contended cases.
3472 //
3473 // Each contended field should not intersect the cache line with another contended field.
3474 // In the absence of alignment information, we end up with pessimistically separating
3475 // the fields with full-width padding.
3476 //
3477 // Additionally, this should not break alignment for the fields, so we round the alignment up
3478 // for each field.
3479 if (contended_count > 0) {
3481 // if there is at least one contended field, we need to have pre-padding for them
3482 if (nonstatic_contended_count > 0) {
3483 next_nonstatic_padded_offset += pad_size;
3484 }
3486 // collect all contended groups
3487 BitMap bm(_cp->size());
3488 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3489 // skip already laid out fields
3490 if (fs.is_offset_set()) continue;
3492 if (fs.is_contended()) {
3493 bm.set_bit(fs.contended_group());
3494 }
3495 }
3497 int current_group = -1;
3498 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3500 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3502 // skip already laid out fields
3503 if (fs.is_offset_set()) continue;
3505 // skip non-contended fields and fields from different group
3506 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3508 // handle statics below
3509 if (fs.access_flags().is_static()) continue;
3511 int real_offset;
3512 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3514 switch (atype) {
3515 case NONSTATIC_BYTE:
3516 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3517 real_offset = next_nonstatic_padded_offset;
3518 next_nonstatic_padded_offset += 1;
3519 break;
3521 case NONSTATIC_SHORT:
3522 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3523 real_offset = next_nonstatic_padded_offset;
3524 next_nonstatic_padded_offset += BytesPerShort;
3525 break;
3527 case NONSTATIC_WORD:
3528 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3529 real_offset = next_nonstatic_padded_offset;
3530 next_nonstatic_padded_offset += BytesPerInt;
3531 break;
3533 case NONSTATIC_DOUBLE:
3534 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3535 real_offset = next_nonstatic_padded_offset;
3536 next_nonstatic_padded_offset += BytesPerLong;
3537 break;
3539 case NONSTATIC_OOP:
3540 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3541 real_offset = next_nonstatic_padded_offset;
3542 next_nonstatic_padded_offset += heapOopSize;
3544 // Create new oop map
3545 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3546 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3547 nonstatic_oop_map_count += 1;
3548 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3549 first_nonstatic_oop_offset = real_offset;
3550 }
3551 break;
3553 default:
3554 ShouldNotReachHere();
3555 }
3557 if (fs.contended_group() == 0) {
3558 // Contended group defines the equivalence class over the fields:
3559 // the fields within the same contended group are not inter-padded.
3560 // The only exception is default group, which does not incur the
3561 // equivalence, and so requires intra-padding.
3562 next_nonstatic_padded_offset += pad_size;
3563 }
3565 fs.set_offset(real_offset);
3566 } // for
3568 // Start laying out the next group.
3569 // Note that this will effectively pad the last group in the back;
3570 // this is expected to alleviate memory contention effects for
3571 // subclass fields and/or adjacent object.
3572 // If this was the default group, the padding is already in place.
3573 if (current_group != 0) {
3574 next_nonstatic_padded_offset += pad_size;
3575 }
3576 }
3578 // handle static fields
3579 }
3581 // Size of instances
3582 int notaligned_offset = next_nonstatic_padded_offset;
3584 // Entire class is contended, pad in the back.
3585 // This helps to alleviate memory contention effects for subclass fields
3586 // and/or adjacent object.
3587 if (parsed_annotations->is_contended()) {
3588 notaligned_offset += pad_size;
3589 }
3591 int next_static_type_offset = align_size_up(next_static_byte_offset, wordSize);
3592 int static_field_size = (next_static_type_offset -
3593 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3595 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3596 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3597 - first_nonstatic_field_offset)/heapOopSize);
3599 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3600 int instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3602 assert(instance_size == align_object_size(align_size_up(
3603 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize + ((parsed_annotations->is_contended()) ? pad_size : 0)),
3604 wordSize) / wordSize), "consistent layout helper value");
3606 // Number of non-static oop map blocks allocated at end of klass.
3607 const unsigned int total_oop_map_count =
3608 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3609 first_nonstatic_oop_offset);
3611 #ifndef PRODUCT
3612 if( PrintCompactFieldsSavings ) {
3613 ResourceMark rm;
3614 if( nonstatic_field_size < orig_nonstatic_field_size ) {
3615 tty->print("[Saved %d of %d bytes in %s]\n",
3616 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3617 orig_nonstatic_field_size*heapOopSize,
3618 _class_name);
3619 } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3620 tty->print("[Wasted %d over %d bytes in %s]\n",
3621 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3622 orig_nonstatic_field_size*heapOopSize,
3623 _class_name);
3624 }
3625 }
3627 if (PrintFieldLayout) {
3628 print_field_layout(_class_name,
3629 _fields,
3630 _cp,
3631 instance_size,
3632 first_nonstatic_field_offset,
3633 next_nonstatic_field_offset,
3634 next_static_type_offset);
3635 }
3637 #endif
3638 // Pass back information needed for InstanceKlass creation
3639 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3640 info->nonstatic_oop_counts = nonstatic_oop_counts;
3641 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3642 info->total_oop_map_count = total_oop_map_count;
3643 info->instance_size = instance_size;
3644 info->static_field_size = static_field_size;
3645 info->nonstatic_field_size = nonstatic_field_size;
3646 info->has_nonstatic_fields = has_nonstatic_fields;
3647 }
3650 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3651 ClassLoaderData* loader_data,
3652 Handle protection_domain,
3653 KlassHandle host_klass,
3654 GrowableArray<Handle>* cp_patches,
3655 TempNewSymbol& parsed_name,
3656 bool verify,
3657 TRAPS) {
3659 // When a retransformable agent is attached, JVMTI caches the
3660 // class bytes that existed before the first retransformation.
3661 // If RedefineClasses() was used before the retransformable
3662 // agent attached, then the cached class bytes may not be the
3663 // original class bytes.
3664 unsigned char *cached_class_file_bytes = NULL;
3665 jint cached_class_file_length;
3666 Handle class_loader(THREAD, loader_data->class_loader());
3667 bool has_default_methods = false;
3668 ResourceMark rm(THREAD);
3670 ClassFileStream* cfs = stream();
3671 // Timing
3672 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3673 JavaThread* jt = (JavaThread*) THREAD;
3675 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3676 ClassLoader::perf_class_parse_selftime(),
3677 NULL,
3678 jt->get_thread_stat()->perf_recursion_counts_addr(),
3679 jt->get_thread_stat()->perf_timers_addr(),
3680 PerfClassTraceTime::PARSE_CLASS);
3682 init_parsed_class_attributes(loader_data);
3684 if (JvmtiExport::should_post_class_file_load_hook()) {
3685 // Get the cached class file bytes (if any) from the class that
3686 // is being redefined or retransformed. We use jvmti_thread_state()
3687 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3688 // a JvmtiThreadState any earlier than necessary. This will help
3689 // avoid the bug described by 7126851.
3690 JvmtiThreadState *state = jt->jvmti_thread_state();
3691 if (state != NULL) {
3692 KlassHandle *h_class_being_redefined =
3693 state->get_class_being_redefined();
3694 if (h_class_being_redefined != NULL) {
3695 instanceKlassHandle ikh_class_being_redefined =
3696 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3697 cached_class_file_bytes =
3698 ikh_class_being_redefined->get_cached_class_file_bytes();
3699 cached_class_file_length =
3700 ikh_class_being_redefined->get_cached_class_file_len();
3701 }
3702 }
3704 unsigned char* ptr = cfs->buffer();
3705 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3707 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3708 &ptr, &end_ptr,
3709 &cached_class_file_bytes,
3710 &cached_class_file_length);
3712 if (ptr != cfs->buffer()) {
3713 // JVMTI agent has modified class file data.
3714 // Set new class file stream using JVMTI agent modified
3715 // class file data.
3716 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3717 set_stream(cfs);
3718 }
3719 }
3721 _host_klass = host_klass;
3722 _cp_patches = cp_patches;
3724 instanceKlassHandle nullHandle;
3726 // Figure out whether we can skip format checking (matching classic VM behavior)
3727 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3729 // Set the verify flag in stream
3730 cfs->set_verify(_need_verify);
3732 // Save the class file name for easier error message printing.
3733 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3735 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3736 // Magic value
3737 u4 magic = cfs->get_u4_fast();
3738 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3739 "Incompatible magic value %u in class file %s",
3740 magic, CHECK_(nullHandle));
3742 // Version numbers
3743 u2 minor_version = cfs->get_u2_fast();
3744 u2 major_version = cfs->get_u2_fast();
3746 // Check version numbers - we check this even with verifier off
3747 if (!is_supported_version(major_version, minor_version)) {
3748 if (name == NULL) {
3749 Exceptions::fthrow(
3750 THREAD_AND_LOCATION,
3751 vmSymbols::java_lang_UnsupportedClassVersionError(),
3752 "Unsupported major.minor version %u.%u",
3753 major_version,
3754 minor_version);
3755 } else {
3756 ResourceMark rm(THREAD);
3757 Exceptions::fthrow(
3758 THREAD_AND_LOCATION,
3759 vmSymbols::java_lang_UnsupportedClassVersionError(),
3760 "%s : Unsupported major.minor version %u.%u",
3761 name->as_C_string(),
3762 major_version,
3763 minor_version);
3764 }
3765 return nullHandle;
3766 }
3768 _major_version = major_version;
3769 _minor_version = minor_version;
3772 // Check if verification needs to be relaxed for this class file
3773 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3774 _relax_verify = Verifier::relax_verify_for(class_loader());
3776 // Constant pool
3777 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3779 int cp_size = cp->length();
3781 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3783 // Access flags
3784 AccessFlags access_flags;
3785 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3787 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3788 // Set abstract bit for old class files for backward compatibility
3789 flags |= JVM_ACC_ABSTRACT;
3790 }
3791 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3792 access_flags.set_flags(flags);
3794 // This class and superclass
3795 u2 this_class_index = cfs->get_u2_fast();
3796 check_property(
3797 valid_cp_range(this_class_index, cp_size) &&
3798 cp->tag_at(this_class_index).is_unresolved_klass(),
3799 "Invalid this class index %u in constant pool in class file %s",
3800 this_class_index, CHECK_(nullHandle));
3802 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3803 assert(class_name != NULL, "class_name can't be null");
3805 // It's important to set parsed_name *before* resolving the super class.
3806 // (it's used for cleanup by the caller if parsing fails)
3807 parsed_name = class_name;
3808 // parsed_name is returned and can be used if there's an error, so add to
3809 // its reference count. Caller will decrement the refcount.
3810 parsed_name->increment_refcount();
3812 // Update _class_name which could be null previously to be class_name
3813 _class_name = class_name;
3815 // Don't need to check whether this class name is legal or not.
3816 // It has been checked when constant pool is parsed.
3817 // However, make sure it is not an array type.
3818 if (_need_verify) {
3819 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3820 "Bad class name in class file %s",
3821 CHECK_(nullHandle));
3822 }
3824 Klass* preserve_this_klass; // for storing result across HandleMark
3826 // release all handles when parsing is done
3827 { HandleMark hm(THREAD);
3829 // Checks if name in class file matches requested name
3830 if (name != NULL && class_name != name) {
3831 ResourceMark rm(THREAD);
3832 Exceptions::fthrow(
3833 THREAD_AND_LOCATION,
3834 vmSymbols::java_lang_NoClassDefFoundError(),
3835 "%s (wrong name: %s)",
3836 name->as_C_string(),
3837 class_name->as_C_string()
3838 );
3839 return nullHandle;
3840 }
3842 if (TraceClassLoadingPreorder) {
3843 tty->print("[Loading %s", name->as_klass_external_name());
3844 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3845 tty->print_cr("]");
3846 }
3848 u2 super_class_index = cfs->get_u2_fast();
3849 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3850 CHECK_NULL);
3852 // Interfaces
3853 u2 itfs_len = cfs->get_u2_fast();
3854 Array<Klass*>* local_interfaces =
3855 parse_interfaces(itfs_len, protection_domain, _class_name,
3856 &has_default_methods, CHECK_(nullHandle));
3858 u2 java_fields_count = 0;
3859 // Fields (offsets are filled in later)
3860 FieldAllocationCount fac;
3861 Array<u2>* fields = parse_fields(class_name,
3862 access_flags.is_interface(),
3863 &fac, &java_fields_count,
3864 CHECK_(nullHandle));
3865 // Methods
3866 bool has_final_method = false;
3867 AccessFlags promoted_flags;
3868 promoted_flags.set_flags(0);
3869 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3870 &promoted_flags,
3871 &has_final_method,
3872 &has_default_methods,
3873 CHECK_(nullHandle));
3875 // Additional attributes
3876 ClassAnnotationCollector parsed_annotations;
3877 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3879 // Make sure this is the end of class file stream
3880 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3882 // We check super class after class file is parsed and format is checked
3883 if (super_class_index > 0 && super_klass.is_null()) {
3884 Symbol* sk = cp->klass_name_at(super_class_index);
3885 if (access_flags.is_interface()) {
3886 // Before attempting to resolve the superclass, check for class format
3887 // errors not checked yet.
3888 guarantee_property(sk == vmSymbols::java_lang_Object(),
3889 "Interfaces must have java.lang.Object as superclass in class file %s",
3890 CHECK_(nullHandle));
3891 }
3892 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3893 class_loader,
3894 protection_domain,
3895 true,
3896 CHECK_(nullHandle));
3898 KlassHandle kh (THREAD, k);
3899 super_klass = instanceKlassHandle(THREAD, kh());
3900 }
3901 if (super_klass.not_null()) {
3903 if (super_klass->has_default_methods()) {
3904 has_default_methods = true;
3905 }
3907 if (super_klass->is_interface()) {
3908 ResourceMark rm(THREAD);
3909 Exceptions::fthrow(
3910 THREAD_AND_LOCATION,
3911 vmSymbols::java_lang_IncompatibleClassChangeError(),
3912 "class %s has interface %s as super class",
3913 class_name->as_klass_external_name(),
3914 super_klass->external_name()
3915 );
3916 return nullHandle;
3917 }
3918 // Make sure super class is not final
3919 if (super_klass->is_final()) {
3920 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3921 }
3922 }
3924 // save super klass for error handling.
3925 _super_klass = super_klass;
3927 // Compute the transitive list of all unique interfaces implemented by this class
3928 _transitive_interfaces =
3929 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3931 // sort methods
3932 intArray* method_ordering = sort_methods(methods);
3934 // promote flags from parse_methods() to the klass' flags
3935 access_flags.add_promoted_flags(promoted_flags.as_int());
3937 // Size of Java vtable (in words)
3938 int vtable_size = 0;
3939 int itable_size = 0;
3940 int num_miranda_methods = 0;
3942 GrowableArray<Method*> all_mirandas(20);
3944 klassVtable::compute_vtable_size_and_num_mirandas(
3945 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3946 access_flags, class_loader, class_name, local_interfaces,
3947 CHECK_(nullHandle));
3949 // Size of Java itable (in words)
3950 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
3952 FieldLayoutInfo info;
3953 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
3955 int total_oop_map_size2 =
3956 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
3958 // Compute reference type
3959 ReferenceType rt;
3960 if (super_klass() == NULL) {
3961 rt = REF_NONE;
3962 } else {
3963 rt = super_klass->reference_type();
3964 }
3966 // We can now create the basic Klass* for this klass
3967 _klass = InstanceKlass::allocate_instance_klass(loader_data,
3968 vtable_size,
3969 itable_size,
3970 info.static_field_size,
3971 total_oop_map_size2,
3972 rt,
3973 access_flags,
3974 name,
3975 super_klass(),
3976 !host_klass.is_null(),
3977 CHECK_(nullHandle));
3978 instanceKlassHandle this_klass (THREAD, _klass);
3980 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
3981 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
3982 "sanity");
3984 // Fill in information already parsed
3985 this_klass->set_should_verify_class(verify);
3986 jint lh = Klass::instance_layout_helper(info.instance_size, false);
3987 this_klass->set_layout_helper(lh);
3988 assert(this_klass->oop_is_instance(), "layout is correct");
3989 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
3990 // Not yet: supers are done below to support the new subtype-checking fields
3991 //this_klass->set_super(super_klass());
3992 this_klass->set_class_loader_data(loader_data);
3993 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
3994 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
3995 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3997 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
3999 if (has_final_method) {
4000 this_klass->set_has_final_method();
4001 }
4002 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4003 // The InstanceKlass::_methods_jmethod_ids cache and the
4004 // InstanceKlass::_methods_cached_itable_indices cache are
4005 // both managed on the assumption that the initial cache
4006 // size is equal to the number of methods in the class. If
4007 // that changes, then InstanceKlass::idnum_can_increment()
4008 // has to be changed accordingly.
4009 this_klass->set_initial_method_idnum(methods->length());
4010 this_klass->set_name(cp->klass_name_at(this_class_index));
4011 if (is_anonymous()) // I am well known to myself
4012 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4014 this_klass->set_minor_version(minor_version);
4015 this_klass->set_major_version(major_version);
4016 this_klass->set_has_default_methods(has_default_methods);
4018 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4019 // (We used to do this lazily, but now we query it in Rewriter,
4020 // which is eagerly done for every method, so we might as well do it now,
4021 // when everything is fresh in memory.)
4022 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4023 for (int j = 0; j < methods->length(); j++) {
4024 methods->at(j)->init_intrinsic_id();
4025 }
4026 }
4028 if (cached_class_file_bytes != NULL) {
4029 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4030 this_klass->set_cached_class_file(cached_class_file_bytes,
4031 cached_class_file_length);
4032 }
4034 // Fill in field values obtained by parse_classfile_attributes
4035 if (parsed_annotations.has_any_annotations())
4036 parsed_annotations.apply_to(this_klass);
4037 apply_parsed_class_attributes(this_klass);
4039 // Miranda methods
4040 if ((num_miranda_methods > 0) ||
4041 // if this class introduced new miranda methods or
4042 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4043 // super class exists and this class inherited miranda methods
4044 ) {
4045 this_klass->set_has_miranda_methods(); // then set a flag
4046 }
4048 // Fill in information needed to compute superclasses.
4049 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4051 // Initialize itable offset tables
4052 klassItable::setup_itable_offset_table(this_klass);
4054 // Compute transitive closure of interfaces this class implements
4055 // Do final class setup
4056 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4058 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4059 set_precomputed_flags(this_klass);
4061 // reinitialize modifiers, using the InnerClasses attribute
4062 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4063 this_klass->set_modifier_flags(computed_modifiers);
4065 // check if this class can access its super class
4066 check_super_class_access(this_klass, CHECK_(nullHandle));
4068 // check if this class can access its superinterfaces
4069 check_super_interface_access(this_klass, CHECK_(nullHandle));
4071 // check if this class overrides any final method
4072 check_final_method_override(this_klass, CHECK_(nullHandle));
4074 // check that if this class is an interface then it doesn't have static methods
4075 if (this_klass->is_interface()) {
4076 /* An interface in a JAVA 8 classfile can be static */
4077 if (_major_version < JAVA_8_VERSION) {
4078 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4079 }
4080 }
4083 #ifdef ASSERT
4084 if (ParseAllGenericSignatures) {
4085 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4086 }
4087 #endif
4089 // Generate any default methods - default methods are interface methods
4090 // that have a default implementation. This is new with Lambda project.
4091 if (has_default_methods && !access_flags.is_interface() &&
4092 local_interfaces->length() > 0) {
4093 DefaultMethods::generate_default_methods(
4094 this_klass(), &all_mirandas, CHECK_(nullHandle));
4095 }
4097 // Allocate mirror and initialize static fields
4098 java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
4100 // Allocate a simple java object for locking during class initialization.
4101 // This needs to be a java object because it can be held across a java call.
4102 typeArrayOop r = oopFactory::new_typeArray(T_INT, 0, CHECK_NULL);
4103 this_klass->set_init_lock(r);
4105 // TODO: Move these oops to the mirror
4106 this_klass->set_protection_domain(protection_domain());
4108 // Update the loader_data graph.
4109 record_defined_class_dependencies(this_klass, CHECK_NULL);
4111 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4112 false /* not shared class */);
4114 if (TraceClassLoading) {
4115 ResourceMark rm;
4116 // print in a single call to reduce interleaving of output
4117 if (cfs->source() != NULL) {
4118 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4119 cfs->source());
4120 } else if (class_loader.is_null()) {
4121 if (THREAD->is_Java_thread()) {
4122 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4123 tty->print("[Loaded %s by instance of %s]\n",
4124 this_klass->external_name(),
4125 InstanceKlass::cast(caller)->external_name());
4126 } else {
4127 tty->print("[Loaded %s]\n", this_klass->external_name());
4128 }
4129 } else {
4130 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4131 InstanceKlass::cast(class_loader->klass())->external_name());
4132 }
4133 }
4135 if (TraceClassResolution) {
4136 ResourceMark rm;
4137 // print out the superclass.
4138 const char * from = this_klass()->external_name();
4139 if (this_klass->java_super() != NULL) {
4140 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4141 }
4142 // print out each of the interface classes referred to by this class.
4143 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4144 if (local_interfaces != NULL) {
4145 int length = local_interfaces->length();
4146 for (int i = 0; i < length; i++) {
4147 Klass* k = local_interfaces->at(i);
4148 InstanceKlass* to_class = InstanceKlass::cast(k);
4149 const char * to = to_class->external_name();
4150 tty->print("RESOLVE %s %s (interface)\n", from, to);
4151 }
4152 }
4153 }
4155 // preserve result across HandleMark
4156 preserve_this_klass = this_klass();
4157 }
4159 // Create new handle outside HandleMark (might be needed for
4160 // Extended Class Redefinition)
4161 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4162 debug_only(this_klass->verify();)
4164 // Clear class if no error has occurred so destructor doesn't deallocate it
4165 _klass = NULL;
4166 return this_klass;
4167 }
4169 // Destructor to clean up if there's an error
4170 ClassFileParser::~ClassFileParser() {
4171 MetadataFactory::free_metadata(_loader_data, _cp);
4172 MetadataFactory::free_array<u2>(_loader_data, _fields);
4174 // Free methods
4175 InstanceKlass::deallocate_methods(_loader_data, _methods);
4177 // beware of the Universe::empty_blah_array!!
4178 if (_inner_classes != Universe::the_empty_short_array()) {
4179 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4180 }
4182 // Free interfaces
4183 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4184 _local_interfaces, _transitive_interfaces);
4186 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4187 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4188 Annotations::free_contents(_loader_data, _fields_annotations);
4189 Annotations::free_contents(_loader_data, _fields_type_annotations);
4191 clear_class_metadata();
4193 // deallocate the klass if already created.
4194 MetadataFactory::free_metadata(_loader_data, _klass);
4195 _klass = NULL;
4196 }
4198 void ClassFileParser::print_field_layout(Symbol* name,
4199 Array<u2>* fields,
4200 constantPoolHandle cp,
4201 int instance_size,
4202 int instance_fields_start,
4203 int instance_fields_end,
4204 int static_fields_end) {
4205 tty->print("%s: field layout\n", name->as_klass_external_name());
4206 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4207 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4208 if (!fs.access_flags().is_static()) {
4209 tty->print(" @%3d \"%s\" %s\n",
4210 fs.offset(),
4211 fs.name()->as_klass_external_name(),
4212 fs.signature()->as_klass_external_name());
4213 }
4214 }
4215 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4216 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4217 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4218 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4219 if (fs.access_flags().is_static()) {
4220 tty->print(" @%3d \"%s\" %s\n",
4221 fs.offset(),
4222 fs.name()->as_klass_external_name(),
4223 fs.signature()->as_klass_external_name());
4224 }
4225 }
4226 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4227 tty->print("\n");
4228 }
4230 unsigned int
4231 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4232 unsigned int nonstatic_oop_map_count,
4233 int first_nonstatic_oop_offset) {
4234 unsigned int map_count =
4235 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4236 if (nonstatic_oop_map_count > 0) {
4237 // We have oops to add to map
4238 if (map_count == 0) {
4239 map_count = nonstatic_oop_map_count;
4240 } else {
4241 // Check whether we should add a new map block or whether the last one can
4242 // be extended
4243 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4244 OopMapBlock* const last_map = first_map + map_count - 1;
4246 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4247 if (next_offset == first_nonstatic_oop_offset) {
4248 // There is no gap bettwen superklass's last oop field and first
4249 // local oop field, merge maps.
4250 nonstatic_oop_map_count -= 1;
4251 } else {
4252 // Superklass didn't end with a oop field, add extra maps
4253 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4254 }
4255 map_count += nonstatic_oop_map_count;
4256 }
4257 }
4258 return map_count;
4259 }
4262 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4263 unsigned int nonstatic_oop_map_count,
4264 int* nonstatic_oop_offsets,
4265 unsigned int* nonstatic_oop_counts) {
4266 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4267 const InstanceKlass* const super = k->superklass();
4268 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4269 if (super_count > 0) {
4270 // Copy maps from superklass
4271 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4272 for (unsigned int i = 0; i < super_count; ++i) {
4273 *this_oop_map++ = *super_oop_map++;
4274 }
4275 }
4277 if (nonstatic_oop_map_count > 0) {
4278 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4279 // The counts differ because there is no gap between superklass's last oop
4280 // field and the first local oop field. Extend the last oop map copied
4281 // from the superklass instead of creating new one.
4282 nonstatic_oop_map_count--;
4283 nonstatic_oop_offsets++;
4284 this_oop_map--;
4285 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4286 this_oop_map++;
4287 }
4289 // Add new map blocks, fill them
4290 while (nonstatic_oop_map_count-- > 0) {
4291 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4292 this_oop_map->set_count(*nonstatic_oop_counts++);
4293 this_oop_map++;
4294 }
4295 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4296 this_oop_map, "sanity");
4297 }
4298 }
4301 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4302 Klass* super = k->super();
4304 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4305 // in which case we don't have to register objects as finalizable
4306 if (!_has_empty_finalizer) {
4307 if (_has_finalizer ||
4308 (super != NULL && super->has_finalizer())) {
4309 k->set_has_finalizer();
4310 }
4311 }
4313 #ifdef ASSERT
4314 bool f = false;
4315 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4316 vmSymbols::void_method_signature());
4317 if (m != NULL && !m->is_empty_method()) {
4318 f = true;
4319 }
4320 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4321 #endif
4323 // Check if this klass supports the java.lang.Cloneable interface
4324 if (SystemDictionary::Cloneable_klass_loaded()) {
4325 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4326 k->set_is_cloneable();
4327 }
4328 }
4330 // Check if this klass has a vanilla default constructor
4331 if (super == NULL) {
4332 // java.lang.Object has empty default constructor
4333 k->set_has_vanilla_constructor();
4334 } else {
4335 if (super->has_vanilla_constructor() &&
4336 _has_vanilla_constructor) {
4337 k->set_has_vanilla_constructor();
4338 }
4339 #ifdef ASSERT
4340 bool v = false;
4341 if (super->has_vanilla_constructor()) {
4342 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4343 ), vmSymbols::void_method_signature());
4344 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4345 v = true;
4346 }
4347 }
4348 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4349 #endif
4350 }
4352 // If it cannot be fast-path allocated, set a bit in the layout helper.
4353 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4354 assert(k->size_helper() > 0, "layout_helper is initialized");
4355 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4356 || k->is_abstract() || k->is_interface()
4357 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4358 || k->size_helper() >= FastAllocateSizeLimit) {
4359 // Forbid fast-path allocation.
4360 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4361 k->set_layout_helper(lh);
4362 }
4363 }
4365 // Attach super classes and interface classes to class loader data
4366 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4367 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4368 if (defining_loader_data->is_the_null_class_loader_data()) {
4369 // Dependencies to null class loader data are implicit.
4370 return;
4371 } else {
4372 // add super class dependency
4373 Klass* super = defined_klass->super();
4374 if (super != NULL) {
4375 defining_loader_data->record_dependency(super, CHECK);
4376 }
4378 // add super interface dependencies
4379 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4380 if (local_interfaces != NULL) {
4381 int length = local_interfaces->length();
4382 for (int i = 0; i < length; i++) {
4383 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4384 }
4385 }
4386 }
4387 }
4389 // utility methods for appending an array with check for duplicates
4391 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4392 // iterate over new interfaces
4393 for (int i = 0; i < ifs->length(); i++) {
4394 Klass* e = ifs->at(i);
4395 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4396 // add new interface
4397 result->append_if_missing(e);
4398 }
4399 }
4401 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4402 instanceKlassHandle super,
4403 Array<Klass*>* local_ifs, TRAPS) {
4404 // Compute maximum size for transitive interfaces
4405 int max_transitive_size = 0;
4406 int super_size = 0;
4407 // Add superclass transitive interfaces size
4408 if (super.not_null()) {
4409 super_size = super->transitive_interfaces()->length();
4410 max_transitive_size += super_size;
4411 }
4412 // Add local interfaces' super interfaces
4413 int local_size = local_ifs->length();
4414 for (int i = 0; i < local_size; i++) {
4415 Klass* l = local_ifs->at(i);
4416 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4417 }
4418 // Finally add local interfaces
4419 max_transitive_size += local_size;
4420 // Construct array
4421 if (max_transitive_size == 0) {
4422 // no interfaces, use canonicalized array
4423 return Universe::the_empty_klass_array();
4424 } else if (max_transitive_size == super_size) {
4425 // no new local interfaces added, share superklass' transitive interface array
4426 return super->transitive_interfaces();
4427 } else if (max_transitive_size == local_size) {
4428 // only local interfaces added, share local interface array
4429 return local_ifs;
4430 } else {
4431 ResourceMark rm;
4432 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4434 // Copy down from superclass
4435 if (super.not_null()) {
4436 append_interfaces(result, super->transitive_interfaces());
4437 }
4439 // Copy down from local interfaces' superinterfaces
4440 for (int i = 0; i < local_ifs->length(); i++) {
4441 Klass* l = local_ifs->at(i);
4442 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4443 }
4444 // Finally add local interfaces
4445 append_interfaces(result, local_ifs);
4447 // length will be less than the max_transitive_size if duplicates were removed
4448 int length = result->length();
4449 assert(length <= max_transitive_size, "just checking");
4450 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4451 for (int i = 0; i < length; i++) {
4452 Klass* e = result->at(i);
4453 assert(e != NULL, "just checking");
4454 new_result->at_put(i, e);
4455 }
4456 return new_result;
4457 }
4458 }
4460 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4461 Klass* super = this_klass->super();
4462 if ((super != NULL) &&
4463 (!Reflection::verify_class_access(this_klass(), super, false))) {
4464 ResourceMark rm(THREAD);
4465 Exceptions::fthrow(
4466 THREAD_AND_LOCATION,
4467 vmSymbols::java_lang_IllegalAccessError(),
4468 "class %s cannot access its superclass %s",
4469 this_klass->external_name(),
4470 InstanceKlass::cast(super)->external_name()
4471 );
4472 return;
4473 }
4474 }
4477 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4478 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4479 int lng = local_interfaces->length();
4480 for (int i = lng - 1; i >= 0; i--) {
4481 Klass* k = local_interfaces->at(i);
4482 assert (k != NULL && k->is_interface(), "invalid interface");
4483 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4484 ResourceMark rm(THREAD);
4485 Exceptions::fthrow(
4486 THREAD_AND_LOCATION,
4487 vmSymbols::java_lang_IllegalAccessError(),
4488 "class %s cannot access its superinterface %s",
4489 this_klass->external_name(),
4490 InstanceKlass::cast(k)->external_name()
4491 );
4492 return;
4493 }
4494 }
4495 }
4498 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4499 Array<Method*>* methods = this_klass->methods();
4500 int num_methods = methods->length();
4502 // go thru each method and check if it overrides a final method
4503 for (int index = 0; index < num_methods; index++) {
4504 Method* m = methods->at(index);
4506 // skip private, static and <init> methods
4507 if ((!m->is_private()) &&
4508 (!m->is_static()) &&
4509 (m->name() != vmSymbols::object_initializer_name())) {
4511 Symbol* name = m->name();
4512 Symbol* signature = m->signature();
4513 Klass* k = this_klass->super();
4514 Method* super_m = NULL;
4515 while (k != NULL) {
4516 // skip supers that don't have final methods.
4517 if (k->has_final_method()) {
4518 // lookup a matching method in the super class hierarchy
4519 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4520 if (super_m == NULL) {
4521 break; // didn't find any match; get out
4522 }
4524 if (super_m->is_final() &&
4525 // matching method in super is final
4526 (Reflection::verify_field_access(this_klass(),
4527 super_m->method_holder(),
4528 super_m->method_holder(),
4529 super_m->access_flags(), false))
4530 // this class can access super final method and therefore override
4531 ) {
4532 ResourceMark rm(THREAD);
4533 Exceptions::fthrow(
4534 THREAD_AND_LOCATION,
4535 vmSymbols::java_lang_VerifyError(),
4536 "class %s overrides final method %s.%s",
4537 this_klass->external_name(),
4538 name->as_C_string(),
4539 signature->as_C_string()
4540 );
4541 return;
4542 }
4544 // continue to look from super_m's holder's super.
4545 k = super_m->method_holder()->super();
4546 continue;
4547 }
4549 k = k->super();
4550 }
4551 }
4552 }
4553 }
4556 // assumes that this_klass is an interface
4557 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4558 assert(this_klass->is_interface(), "not an interface");
4559 Array<Method*>* methods = this_klass->methods();
4560 int num_methods = methods->length();
4562 for (int index = 0; index < num_methods; index++) {
4563 Method* m = methods->at(index);
4564 // if m is static and not the init method, throw a verify error
4565 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4566 ResourceMark rm(THREAD);
4567 Exceptions::fthrow(
4568 THREAD_AND_LOCATION,
4569 vmSymbols::java_lang_VerifyError(),
4570 "Illegal static method %s in interface %s",
4571 m->name()->as_C_string(),
4572 this_klass->external_name()
4573 );
4574 return;
4575 }
4576 }
4577 }
4579 // utility methods for format checking
4581 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4582 if (!_need_verify) { return; }
4584 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4585 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4586 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4587 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4588 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4589 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4590 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4592 if ((is_abstract && is_final) ||
4593 (is_interface && !is_abstract) ||
4594 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4595 (!is_interface && major_gte_15 && is_annotation)) {
4596 ResourceMark rm(THREAD);
4597 Exceptions::fthrow(
4598 THREAD_AND_LOCATION,
4599 vmSymbols::java_lang_ClassFormatError(),
4600 "Illegal class modifiers in class %s: 0x%X",
4601 _class_name->as_C_string(), flags
4602 );
4603 return;
4604 }
4605 }
4607 bool ClassFileParser::has_illegal_visibility(jint flags) {
4608 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4609 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4610 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4612 return ((is_public && is_protected) ||
4613 (is_public && is_private) ||
4614 (is_protected && is_private));
4615 }
4617 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4618 u2 max_version =
4619 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4620 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4621 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4622 (major <= max_version) &&
4623 ((major != max_version) ||
4624 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4625 }
4627 void ClassFileParser::verify_legal_field_modifiers(
4628 jint flags, bool is_interface, TRAPS) {
4629 if (!_need_verify) { return; }
4631 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4632 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4633 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4634 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4635 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4636 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4637 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4638 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4639 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4641 bool is_illegal = false;
4643 if (is_interface) {
4644 if (!is_public || !is_static || !is_final || is_private ||
4645 is_protected || is_volatile || is_transient ||
4646 (major_gte_15 && is_enum)) {
4647 is_illegal = true;
4648 }
4649 } else { // not interface
4650 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4651 is_illegal = true;
4652 }
4653 }
4655 if (is_illegal) {
4656 ResourceMark rm(THREAD);
4657 Exceptions::fthrow(
4658 THREAD_AND_LOCATION,
4659 vmSymbols::java_lang_ClassFormatError(),
4660 "Illegal field modifiers in class %s: 0x%X",
4661 _class_name->as_C_string(), flags);
4662 return;
4663 }
4664 }
4666 void ClassFileParser::verify_legal_method_modifiers(
4667 jint flags, bool is_interface, Symbol* name, TRAPS) {
4668 if (!_need_verify) { return; }
4670 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4671 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4672 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4673 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4674 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4675 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4676 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4677 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4678 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4679 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4680 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4681 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4682 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4684 bool is_illegal = false;
4686 if (is_interface) {
4687 if (major_gte_8) {
4688 // Class file version is JAVA_8_VERSION or later Methods of
4689 // interfaces may set any of the flags except ACC_PROTECTED,
4690 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4691 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4692 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4693 (is_native || is_protected || is_final || is_synchronized) ||
4694 // If a specific method of a class or interface has its
4695 // ACC_ABSTRACT flag set, it must not have any of its
4696 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4697 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4698 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4699 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4700 (is_abstract && (is_private || is_static || is_strict))) {
4701 is_illegal = true;
4702 }
4703 } else if (major_gte_15) {
4704 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4705 if (!is_public || is_static || is_final || is_synchronized ||
4706 is_native || !is_abstract || is_strict) {
4707 is_illegal = true;
4708 }
4709 } else {
4710 // Class file version is pre-JAVA_1_5_VERSION
4711 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4712 is_illegal = true;
4713 }
4714 }
4715 } else { // not interface
4716 if (is_initializer) {
4717 if (is_static || is_final || is_synchronized || is_native ||
4718 is_abstract || (major_gte_15 && is_bridge)) {
4719 is_illegal = true;
4720 }
4721 } else { // not initializer
4722 if (is_abstract) {
4723 if ((is_final || is_native || is_private || is_static ||
4724 (major_gte_15 && (is_synchronized || is_strict)))) {
4725 is_illegal = true;
4726 }
4727 }
4728 if (has_illegal_visibility(flags)) {
4729 is_illegal = true;
4730 }
4731 }
4732 }
4734 if (is_illegal) {
4735 ResourceMark rm(THREAD);
4736 Exceptions::fthrow(
4737 THREAD_AND_LOCATION,
4738 vmSymbols::java_lang_ClassFormatError(),
4739 "Method %s in class %s has illegal modifiers: 0x%X",
4740 name->as_C_string(), _class_name->as_C_string(), flags);
4741 return;
4742 }
4743 }
4745 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4746 assert(_need_verify, "only called when _need_verify is true");
4747 int i = 0;
4748 int count = length >> 2;
4749 for (int k=0; k<count; k++) {
4750 unsigned char b0 = buffer[i];
4751 unsigned char b1 = buffer[i+1];
4752 unsigned char b2 = buffer[i+2];
4753 unsigned char b3 = buffer[i+3];
4754 // For an unsigned char v,
4755 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4756 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4757 unsigned char res = b0 | b0 - 1 |
4758 b1 | b1 - 1 |
4759 b2 | b2 - 1 |
4760 b3 | b3 - 1;
4761 if (res >= 128) break;
4762 i += 4;
4763 }
4764 for(; i < length; i++) {
4765 unsigned short c;
4766 // no embedded zeros
4767 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4768 if(buffer[i] < 128) {
4769 continue;
4770 }
4771 if ((i + 5) < length) { // see if it's legal supplementary character
4772 if (UTF8::is_supplementary_character(&buffer[i])) {
4773 c = UTF8::get_supplementary_character(&buffer[i]);
4774 i += 5;
4775 continue;
4776 }
4777 }
4778 switch (buffer[i] >> 4) {
4779 default: break;
4780 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4781 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4782 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4783 c = (buffer[i] & 0x1F) << 6;
4784 i++;
4785 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4786 c += buffer[i] & 0x3F;
4787 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4788 // for classes with major > 47, c must a null or a character in its shortest form
4789 break;
4790 }
4791 }
4792 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4793 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4794 c = (buffer[i] & 0xF) << 12;
4795 i += 2;
4796 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4797 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4798 if (_major_version <= 47 || c >= 0x800) {
4799 // for classes with major > 47, c must be in its shortest form
4800 break;
4801 }
4802 }
4803 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4804 } // end of switch
4805 } // end of for
4806 }
4808 // Checks if name is a legal class name.
4809 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4810 if (!_need_verify || _relax_verify) { return; }
4812 char buf[fixed_buffer_size];
4813 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4814 unsigned int length = name->utf8_length();
4815 bool legal = false;
4817 if (length > 0) {
4818 char* p;
4819 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4820 p = skip_over_field_signature(bytes, false, length, CHECK);
4821 legal = (p != NULL) && ((p - bytes) == (int)length);
4822 } else if (_major_version < JAVA_1_5_VERSION) {
4823 if (bytes[0] != '<') {
4824 p = skip_over_field_name(bytes, true, length);
4825 legal = (p != NULL) && ((p - bytes) == (int)length);
4826 }
4827 } else {
4828 // 4900761: relax the constraints based on JSR202 spec
4829 // Class names may be drawn from the entire Unicode character set.
4830 // Identifiers between '/' must be unqualified names.
4831 // The utf8 string has been verified when parsing cpool entries.
4832 legal = verify_unqualified_name(bytes, length, LegalClass);
4833 }
4834 }
4835 if (!legal) {
4836 ResourceMark rm(THREAD);
4837 Exceptions::fthrow(
4838 THREAD_AND_LOCATION,
4839 vmSymbols::java_lang_ClassFormatError(),
4840 "Illegal class name \"%s\" in class file %s", bytes,
4841 _class_name->as_C_string()
4842 );
4843 return;
4844 }
4845 }
4847 // Checks if name is a legal field name.
4848 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4849 if (!_need_verify || _relax_verify) { return; }
4851 char buf[fixed_buffer_size];
4852 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4853 unsigned int length = name->utf8_length();
4854 bool legal = false;
4856 if (length > 0) {
4857 if (_major_version < JAVA_1_5_VERSION) {
4858 if (bytes[0] != '<') {
4859 char* p = skip_over_field_name(bytes, false, length);
4860 legal = (p != NULL) && ((p - bytes) == (int)length);
4861 }
4862 } else {
4863 // 4881221: relax the constraints based on JSR202 spec
4864 legal = verify_unqualified_name(bytes, length, LegalField);
4865 }
4866 }
4868 if (!legal) {
4869 ResourceMark rm(THREAD);
4870 Exceptions::fthrow(
4871 THREAD_AND_LOCATION,
4872 vmSymbols::java_lang_ClassFormatError(),
4873 "Illegal field name \"%s\" in class %s", bytes,
4874 _class_name->as_C_string()
4875 );
4876 return;
4877 }
4878 }
4880 // Checks if name is a legal method name.
4881 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4882 if (!_need_verify || _relax_verify) { return; }
4884 assert(name != NULL, "method name is null");
4885 char buf[fixed_buffer_size];
4886 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4887 unsigned int length = name->utf8_length();
4888 bool legal = false;
4890 if (length > 0) {
4891 if (bytes[0] == '<') {
4892 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4893 legal = true;
4894 }
4895 } else if (_major_version < JAVA_1_5_VERSION) {
4896 char* p;
4897 p = skip_over_field_name(bytes, false, length);
4898 legal = (p != NULL) && ((p - bytes) == (int)length);
4899 } else {
4900 // 4881221: relax the constraints based on JSR202 spec
4901 legal = verify_unqualified_name(bytes, length, LegalMethod);
4902 }
4903 }
4905 if (!legal) {
4906 ResourceMark rm(THREAD);
4907 Exceptions::fthrow(
4908 THREAD_AND_LOCATION,
4909 vmSymbols::java_lang_ClassFormatError(),
4910 "Illegal method name \"%s\" in class %s", bytes,
4911 _class_name->as_C_string()
4912 );
4913 return;
4914 }
4915 }
4918 // Checks if signature is a legal field signature.
4919 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4920 if (!_need_verify) { return; }
4922 char buf[fixed_buffer_size];
4923 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4924 unsigned int length = signature->utf8_length();
4925 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4927 if (p == NULL || (p - bytes) != (int)length) {
4928 throwIllegalSignature("Field", name, signature, CHECK);
4929 }
4930 }
4932 // Checks if signature is a legal method signature.
4933 // Returns number of parameters
4934 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4935 if (!_need_verify) {
4936 // make sure caller's args_size will be less than 0 even for non-static
4937 // method so it will be recomputed in compute_size_of_parameters().
4938 return -2;
4939 }
4941 unsigned int args_size = 0;
4942 char buf[fixed_buffer_size];
4943 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4944 unsigned int length = signature->utf8_length();
4945 char* nextp;
4947 // The first character must be a '('
4948 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4949 length--;
4950 // Skip over legal field signatures
4951 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4952 while ((length > 0) && (nextp != NULL)) {
4953 args_size++;
4954 if (p[0] == 'J' || p[0] == 'D') {
4955 args_size++;
4956 }
4957 length -= nextp - p;
4958 p = nextp;
4959 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4960 }
4961 // The first non-signature thing better be a ')'
4962 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4963 length--;
4964 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4965 // All internal methods must return void
4966 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4967 return args_size;
4968 }
4969 } else {
4970 // Now we better just have a return value
4971 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4972 if (nextp && ((int)length == (nextp - p))) {
4973 return args_size;
4974 }
4975 }
4976 }
4977 }
4978 // Report error
4979 throwIllegalSignature("Method", name, signature, CHECK_0);
4980 return 0;
4981 }
4984 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4985 // Method names also may not contain the characters '<' or '>', unless <init>
4986 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4987 // method. Because these names have been checked as special cases before
4988 // calling this method in verify_legal_method_name.
4989 bool ClassFileParser::verify_unqualified_name(
4990 char* name, unsigned int length, int type) {
4991 jchar ch;
4993 for (char* p = name; p != name + length; ) {
4994 ch = *p;
4995 if (ch < 128) {
4996 p++;
4997 if (ch == '.' || ch == ';' || ch == '[' ) {
4998 return false; // do not permit '.', ';', or '['
4999 }
5000 if (type != LegalClass && ch == '/') {
5001 return false; // do not permit '/' unless it's class name
5002 }
5003 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5004 return false; // do not permit '<' or '>' in method names
5005 }
5006 } else {
5007 char* tmp_p = UTF8::next(p, &ch);
5008 p = tmp_p;
5009 }
5010 }
5011 return true;
5012 }
5015 // Take pointer to a string. Skip over the longest part of the string that could
5016 // be taken as a fieldname. Allow '/' if slash_ok is true.
5017 // Return a pointer to just past the fieldname.
5018 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5019 // being true, we saw consecutive slashes (meaning we were looking for a
5020 // qualified path but found something that was badly-formed).
5021 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5022 char* p;
5023 jchar ch;
5024 jboolean last_is_slash = false;
5025 jboolean not_first_ch = false;
5027 for (p = name; p != name + length; not_first_ch = true) {
5028 char* old_p = p;
5029 ch = *p;
5030 if (ch < 128) {
5031 p++;
5032 // quick check for ascii
5033 if ((ch >= 'a' && ch <= 'z') ||
5034 (ch >= 'A' && ch <= 'Z') ||
5035 (ch == '_' || ch == '$') ||
5036 (not_first_ch && ch >= '0' && ch <= '9')) {
5037 last_is_slash = false;
5038 continue;
5039 }
5040 if (slash_ok && ch == '/') {
5041 if (last_is_slash) {
5042 return NULL; // Don't permit consecutive slashes
5043 }
5044 last_is_slash = true;
5045 continue;
5046 }
5047 } else {
5048 jint unicode_ch;
5049 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5050 p = tmp_p;
5051 last_is_slash = false;
5052 // Check if ch is Java identifier start or is Java identifier part
5053 // 4672820: call java.lang.Character methods directly without generating separate tables.
5054 EXCEPTION_MARK;
5055 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5057 // return value
5058 JavaValue result(T_BOOLEAN);
5059 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5060 JavaCallArguments args;
5061 args.push_int(unicode_ch);
5063 // public static boolean isJavaIdentifierStart(char ch);
5064 JavaCalls::call_static(&result,
5065 klass,
5066 vmSymbols::isJavaIdentifierStart_name(),
5067 vmSymbols::int_bool_signature(),
5068 &args,
5069 THREAD);
5071 if (HAS_PENDING_EXCEPTION) {
5072 CLEAR_PENDING_EXCEPTION;
5073 return 0;
5074 }
5075 if (result.get_jboolean()) {
5076 continue;
5077 }
5079 if (not_first_ch) {
5080 // public static boolean isJavaIdentifierPart(char ch);
5081 JavaCalls::call_static(&result,
5082 klass,
5083 vmSymbols::isJavaIdentifierPart_name(),
5084 vmSymbols::int_bool_signature(),
5085 &args,
5086 THREAD);
5088 if (HAS_PENDING_EXCEPTION) {
5089 CLEAR_PENDING_EXCEPTION;
5090 return 0;
5091 }
5093 if (result.get_jboolean()) {
5094 continue;
5095 }
5096 }
5097 }
5098 return (not_first_ch) ? old_p : NULL;
5099 }
5100 return (not_first_ch) ? p : NULL;
5101 }
5104 // Take pointer to a string. Skip over the longest part of the string that could
5105 // be taken as a field signature. Allow "void" if void_ok.
5106 // Return a pointer to just past the signature.
5107 // Return NULL if no legal signature is found.
5108 char* ClassFileParser::skip_over_field_signature(char* signature,
5109 bool void_ok,
5110 unsigned int length,
5111 TRAPS) {
5112 unsigned int array_dim = 0;
5113 while (length > 0) {
5114 switch (signature[0]) {
5115 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5116 case JVM_SIGNATURE_BOOLEAN:
5117 case JVM_SIGNATURE_BYTE:
5118 case JVM_SIGNATURE_CHAR:
5119 case JVM_SIGNATURE_SHORT:
5120 case JVM_SIGNATURE_INT:
5121 case JVM_SIGNATURE_FLOAT:
5122 case JVM_SIGNATURE_LONG:
5123 case JVM_SIGNATURE_DOUBLE:
5124 return signature + 1;
5125 case JVM_SIGNATURE_CLASS: {
5126 if (_major_version < JAVA_1_5_VERSION) {
5127 // Skip over the class name if one is there
5128 char* p = skip_over_field_name(signature + 1, true, --length);
5130 // The next character better be a semicolon
5131 if (p && (p - signature) > 1 && p[0] == ';') {
5132 return p + 1;
5133 }
5134 } else {
5135 // 4900761: For class version > 48, any unicode is allowed in class name.
5136 length--;
5137 signature++;
5138 while (length > 0 && signature[0] != ';') {
5139 if (signature[0] == '.') {
5140 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5141 }
5142 length--;
5143 signature++;
5144 }
5145 if (signature[0] == ';') { return signature + 1; }
5146 }
5148 return NULL;
5149 }
5150 case JVM_SIGNATURE_ARRAY:
5151 array_dim++;
5152 if (array_dim > 255) {
5153 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5154 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5155 }
5156 // The rest of what's there better be a legal signature
5157 signature++;
5158 length--;
5159 void_ok = false;
5160 break;
5162 default:
5163 return NULL;
5164 }
5165 }
5166 return NULL;
5167 }