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 */
24
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/referenceType.hpp"
43 #include "memory/universe.inline.hpp"
44 #include "oops/constantPool.hpp"
45 #include "oops/fieldStreams.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/instanceMirrorKlass.hpp"
48 #include "oops/klass.inline.hpp"
49 #include "oops/klassVtable.hpp"
50 #include "oops/method.hpp"
51 #include "oops/symbol.hpp"
52 #include "prims/jvm.h"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/jvmtiThreadState.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/perfData.hpp"
57 #include "runtime/reflection.hpp"
58 #include "runtime/signature.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/classLoadingService.hpp"
61 #include "services/threadService.hpp"
62 #include "utilities/array.hpp"
63 #include "utilities/globalDefinitions.hpp"
64
65 // We generally try to create the oops directly when parsing, rather than
66 // allocating temporary data structures and copying the bytes twice. A
67 // temporary area is only needed when parsing utf8 entries in the constant
68 // pool and when parsing line number tables.
69
70 // We add assert in debug mode when class format is not checked.
71
72 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
73 #define JAVA_MIN_SUPPORTED_VERSION 45
74 #define JAVA_MAX_SUPPORTED_VERSION 52
75 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
76
77 // Used for two backward compatibility reasons:
78 // - to check for new additions to the class file format in JDK1.5
79 // - to check for bug fixes in the format checker in JDK1.5
80 #define JAVA_1_5_VERSION 49
81
82 // Used for backward compatibility reasons:
83 // - to check for javac bug fixes that happened after 1.5
84 // - also used as the max version when running in jdk6
85 #define JAVA_6_VERSION 50
86
87 // Used for backward compatibility reasons:
88 // - to check NameAndType_info signatures more aggressively
89 #define JAVA_7_VERSION 51
90
91 // Extension method support.
92 #define JAVA_8_VERSION 52
93
94 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
95 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
96 // this function (_current can be allocated in a register, with scalar
97 // replacement of aggregates). The _current pointer is copied back to
98 // stream() when this function returns. DON'T call another method within
99 // this method that uses stream().
100 ClassFileStream* cfs0 = stream();
101 ClassFileStream cfs1 = *cfs0;
102 ClassFileStream* cfs = &cfs1;
103 #ifdef ASSERT
104 assert(cfs->allocated_on_stack(),"should be local");
105 u1* old_current = cfs0->current();
106 #endif
107 Handle class_loader(THREAD, _loader_data->class_loader());
108
109 // Used for batching symbol allocations.
110 const char* names[SymbolTable::symbol_alloc_batch_size];
111 int lengths[SymbolTable::symbol_alloc_batch_size];
112 int indices[SymbolTable::symbol_alloc_batch_size];
113 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
114 int names_count = 0;
115
116 // parsing Index 0 is unused
117 for (int index = 1; index < length; index++) {
118 // Each of the following case guarantees one more byte in the stream
119 // for the following tag or the access_flags following constant pool,
120 // so we don't need bounds-check for reading tag.
121 u1 tag = cfs->get_u1_fast();
122 switch (tag) {
123 case JVM_CONSTANT_Class :
124 {
125 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
126 u2 name_index = cfs->get_u2_fast();
127 _cp->klass_index_at_put(index, name_index);
128 }
129 break;
130 case JVM_CONSTANT_Fieldref :
131 {
132 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
133 u2 class_index = cfs->get_u2_fast();
134 u2 name_and_type_index = cfs->get_u2_fast();
135 _cp->field_at_put(index, class_index, name_and_type_index);
136 }
137 break;
138 case JVM_CONSTANT_Methodref :
139 {
140 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
141 u2 class_index = cfs->get_u2_fast();
142 u2 name_and_type_index = cfs->get_u2_fast();
143 _cp->method_at_put(index, class_index, name_and_type_index);
144 }
145 break;
146 case JVM_CONSTANT_InterfaceMethodref :
147 {
148 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
149 u2 class_index = cfs->get_u2_fast();
150 u2 name_and_type_index = cfs->get_u2_fast();
151 _cp->interface_method_at_put(index, class_index, name_and_type_index);
152 }
153 break;
154 case JVM_CONSTANT_String :
155 {
156 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
157 u2 string_index = cfs->get_u2_fast();
158 _cp->string_index_at_put(index, string_index);
159 }
160 break;
161 case JVM_CONSTANT_MethodHandle :
162 case JVM_CONSTANT_MethodType :
163 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
164 classfile_parse_error(
165 "Class file version does not support constant tag %u in class file %s",
166 tag, CHECK);
167 }
168 if (!EnableInvokeDynamic) {
169 classfile_parse_error(
170 "This JVM does not support constant tag %u in class file %s",
171 tag, CHECK);
172 }
173 if (tag == JVM_CONSTANT_MethodHandle) {
174 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
175 u1 ref_kind = cfs->get_u1_fast();
176 u2 method_index = cfs->get_u2_fast();
177 _cp->method_handle_index_at_put(index, ref_kind, method_index);
178 } else if (tag == JVM_CONSTANT_MethodType) {
179 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
180 u2 signature_index = cfs->get_u2_fast();
181 _cp->method_type_index_at_put(index, signature_index);
182 } else {
183 ShouldNotReachHere();
184 }
185 break;
186 case JVM_CONSTANT_InvokeDynamic :
187 {
188 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
189 classfile_parse_error(
190 "Class file version does not support constant tag %u in class file %s",
191 tag, CHECK);
192 }
193 if (!EnableInvokeDynamic) {
194 classfile_parse_error(
195 "This JVM does not support constant tag %u in class file %s",
196 tag, CHECK);
197 }
198 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
199 u2 bootstrap_specifier_index = cfs->get_u2_fast();
200 u2 name_and_type_index = cfs->get_u2_fast();
201 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
202 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
203 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
204 }
205 break;
206 case JVM_CONSTANT_Integer :
207 {
208 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
209 u4 bytes = cfs->get_u4_fast();
210 _cp->int_at_put(index, (jint) bytes);
211 }
212 break;
213 case JVM_CONSTANT_Float :
214 {
215 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
216 u4 bytes = cfs->get_u4_fast();
217 _cp->float_at_put(index, *(jfloat*)&bytes);
218 }
219 break;
220 case JVM_CONSTANT_Long :
221 // A mangled type might cause you to overrun allocated memory
222 guarantee_property(index+1 < length,
223 "Invalid constant pool entry %u in class file %s",
224 index, CHECK);
225 {
226 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
227 u8 bytes = cfs->get_u8_fast();
228 _cp->long_at_put(index, bytes);
229 }
230 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
231 break;
232 case JVM_CONSTANT_Double :
233 // A mangled type might cause you to overrun allocated memory
234 guarantee_property(index+1 < length,
235 "Invalid constant pool entry %u in class file %s",
236 index, CHECK);
237 {
238 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
239 u8 bytes = cfs->get_u8_fast();
240 _cp->double_at_put(index, *(jdouble*)&bytes);
241 }
242 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
243 break;
244 case JVM_CONSTANT_NameAndType :
245 {
246 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
247 u2 name_index = cfs->get_u2_fast();
248 u2 signature_index = cfs->get_u2_fast();
249 _cp->name_and_type_at_put(index, name_index, signature_index);
250 }
251 break;
252 case JVM_CONSTANT_Utf8 :
253 {
254 cfs->guarantee_more(2, CHECK); // utf8_length
255 u2 utf8_length = cfs->get_u2_fast();
256 u1* utf8_buffer = cfs->get_u1_buffer();
257 assert(utf8_buffer != NULL, "null utf8 buffer");
258 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
259 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
260 cfs->skip_u1_fast(utf8_length);
261
262 // Before storing the symbol, make sure it's legal
263 if (_need_verify) {
264 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
265 }
266
267 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
268 Handle patch = clear_cp_patch_at(index);
269 guarantee_property(java_lang_String::is_instance(patch()),
270 "Illegal utf8 patch at %d in class file %s",
271 index, CHECK);
272 char* str = java_lang_String::as_utf8_string(patch());
273 // (could use java_lang_String::as_symbol instead, but might as well batch them)
274 utf8_buffer = (u1*) str;
275 utf8_length = (int) strlen(str);
276 }
277
278 unsigned int hash;
279 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
280 if (result == NULL) {
281 names[names_count] = (char*)utf8_buffer;
282 lengths[names_count] = utf8_length;
283 indices[names_count] = index;
284 hashValues[names_count++] = hash;
285 if (names_count == SymbolTable::symbol_alloc_batch_size) {
286 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
287 names_count = 0;
288 }
289 } else {
290 _cp->symbol_at_put(index, result);
291 }
292 }
293 break;
294 default:
295 classfile_parse_error(
296 "Unknown constant tag %u in class file %s", tag, CHECK);
297 break;
298 }
299 }
300
301 // Allocate the remaining symbols
302 if (names_count > 0) {
303 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
304 }
305
306 // Copy _current pointer of local copy back to stream().
307 #ifdef ASSERT
308 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
309 #endif
310 cfs0->set_current(cfs1.current());
311 }
312
313 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
314
315 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
316 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
317 return cp->symbol_at(index);
318 else
319 return NULL;
320 }
321
322 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
323 ClassFileStream* cfs = stream();
324 constantPoolHandle nullHandle;
325
326 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
327 u2 length = cfs->get_u2_fast();
328 guarantee_property(
329 length >= 1, "Illegal constant pool size %u in class file %s",
330 length, CHECK_(nullHandle));
331 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
332 CHECK_(nullHandle));
333 _cp = constant_pool; // save in case of errors
334 constantPoolHandle cp (THREAD, constant_pool);
335
336 // parsing constant pool entries
337 parse_constant_pool_entries(length, CHECK_(nullHandle));
338
339 int index = 1; // declared outside of loops for portability
340
341 // first verification pass - validate cross references and fixup class and string constants
342 for (index = 1; index < length; index++) { // Index 0 is unused
343 jbyte tag = cp->tag_at(index).value();
344 switch (tag) {
345 case JVM_CONSTANT_Class :
346 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
347 break;
348 case JVM_CONSTANT_Fieldref :
349 // fall through
350 case JVM_CONSTANT_Methodref :
351 // fall through
352 case JVM_CONSTANT_InterfaceMethodref : {
353 if (!_need_verify) break;
354 int klass_ref_index = cp->klass_ref_index_at(index);
355 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
356 check_property(valid_klass_reference_at(klass_ref_index),
357 "Invalid constant pool index %u in class file %s",
358 klass_ref_index,
359 CHECK_(nullHandle));
360 check_property(valid_cp_range(name_and_type_ref_index, length) &&
361 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
362 "Invalid constant pool index %u in class file %s",
363 name_and_type_ref_index,
364 CHECK_(nullHandle));
365 break;
366 }
367 case JVM_CONSTANT_String :
368 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
369 break;
370 case JVM_CONSTANT_Integer :
371 break;
372 case JVM_CONSTANT_Float :
373 break;
374 case JVM_CONSTANT_Long :
375 case JVM_CONSTANT_Double :
376 index++;
377 check_property(
378 (index < length && cp->tag_at(index).is_invalid()),
379 "Improper constant pool long/double index %u in class file %s",
380 index, CHECK_(nullHandle));
381 break;
382 case JVM_CONSTANT_NameAndType : {
383 if (!_need_verify) break;
384 int name_ref_index = cp->name_ref_index_at(index);
385 int signature_ref_index = cp->signature_ref_index_at(index);
386 check_property(valid_symbol_at(name_ref_index),
387 "Invalid constant pool index %u in class file %s",
388 name_ref_index, CHECK_(nullHandle));
389 check_property(valid_symbol_at(signature_ref_index),
390 "Invalid constant pool index %u in class file %s",
391 signature_ref_index, CHECK_(nullHandle));
392 break;
393 }
394 case JVM_CONSTANT_Utf8 :
395 break;
396 case JVM_CONSTANT_UnresolvedClass : // fall-through
397 case JVM_CONSTANT_UnresolvedClassInError:
398 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
399 break;
400 case JVM_CONSTANT_ClassIndex :
401 {
402 int class_index = cp->klass_index_at(index);
403 check_property(valid_symbol_at(class_index),
404 "Invalid constant pool index %u in class file %s",
405 class_index, CHECK_(nullHandle));
406 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
407 }
408 break;
409 case JVM_CONSTANT_StringIndex :
410 {
411 int string_index = cp->string_index_at(index);
412 check_property(valid_symbol_at(string_index),
413 "Invalid constant pool index %u in class file %s",
414 string_index, CHECK_(nullHandle));
415 Symbol* sym = cp->symbol_at(string_index);
416 cp->unresolved_string_at_put(index, sym);
417 }
418 break;
419 case JVM_CONSTANT_MethodHandle :
420 {
421 int ref_index = cp->method_handle_index_at(index);
422 check_property(
423 valid_cp_range(ref_index, length) &&
424 EnableInvokeDynamic,
425 "Invalid constant pool index %u in class file %s",
426 ref_index, CHECK_(nullHandle));
427 constantTag tag = cp->tag_at(ref_index);
428 int ref_kind = cp->method_handle_ref_kind_at(index);
429 switch (ref_kind) {
430 case JVM_REF_getField:
431 case JVM_REF_getStatic:
432 case JVM_REF_putField:
433 case JVM_REF_putStatic:
434 check_property(
435 tag.is_field(),
436 "Invalid constant pool index %u in class file %s (not a field)",
437 ref_index, CHECK_(nullHandle));
438 break;
439 case JVM_REF_invokeVirtual:
440 case JVM_REF_newInvokeSpecial:
441 check_property(
442 tag.is_method(),
443 "Invalid constant pool index %u in class file %s (not a method)",
444 ref_index, CHECK_(nullHandle));
445 break;
446 case JVM_REF_invokeStatic:
447 case JVM_REF_invokeSpecial:
448 check_property(tag.is_method() ||
449 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
450 "Invalid constant pool index %u in class file %s (not a method)",
451 ref_index, CHECK_(nullHandle));
452 break;
453 case JVM_REF_invokeInterface:
454 check_property(
455 tag.is_interface_method(),
456 "Invalid constant pool index %u in class file %s (not an interface method)",
457 ref_index, CHECK_(nullHandle));
458 break;
459 default:
460 classfile_parse_error(
461 "Bad method handle kind at constant pool index %u in class file %s",
462 index, CHECK_(nullHandle));
463 }
464 // Keep the ref_index unchanged. It will be indirected at link-time.
465 }
466 break;
467 case JVM_CONSTANT_MethodType :
468 {
469 int ref_index = cp->method_type_index_at(index);
470 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
471 "Invalid constant pool index %u in class file %s",
472 ref_index, CHECK_(nullHandle));
473 }
474 break;
475 case JVM_CONSTANT_InvokeDynamic :
476 {
477 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
478 check_property(valid_cp_range(name_and_type_ref_index, length) &&
479 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
480 "Invalid constant pool index %u in class file %s",
481 name_and_type_ref_index,
482 CHECK_(nullHandle));
483 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
484 break;
485 }
486 default:
487 fatal(err_msg("bad constant pool tag value %u",
488 cp->tag_at(index).value()));
489 ShouldNotReachHere();
490 break;
491 } // end of switch
492 } // end of for
493
494 if (_cp_patches != NULL) {
495 // need to treat this_class specially...
496 assert(EnableInvokeDynamic, "");
497 int this_class_index;
498 {
499 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
500 u1* mark = cfs->current();
501 u2 flags = cfs->get_u2_fast();
502 this_class_index = cfs->get_u2_fast();
503 cfs->set_current(mark); // revert to mark
504 }
505
506 for (index = 1; index < length; index++) { // Index 0 is unused
507 if (has_cp_patch_at(index)) {
508 guarantee_property(index != this_class_index,
509 "Illegal constant pool patch to self at %d in class file %s",
510 index, CHECK_(nullHandle));
511 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
512 }
513 }
514 }
515
516 if (!_need_verify) {
517 return cp;
518 }
519
520 // second verification pass - checks the strings are of the right format.
521 // but not yet to the other entries
522 for (index = 1; index < length; index++) {
523 jbyte tag = cp->tag_at(index).value();
524 switch (tag) {
525 case JVM_CONSTANT_UnresolvedClass: {
526 Symbol* class_name = cp->unresolved_klass_at(index);
527 // check the name, even if _cp_patches will overwrite it
528 verify_legal_class_name(class_name, CHECK_(nullHandle));
529 break;
530 }
531 case JVM_CONSTANT_NameAndType: {
532 if (_need_verify && _major_version >= JAVA_7_VERSION) {
533 int sig_index = cp->signature_ref_index_at(index);
534 int name_index = cp->name_ref_index_at(index);
535 Symbol* name = cp->symbol_at(name_index);
536 Symbol* sig = cp->symbol_at(sig_index);
537 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
538 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
539 } else {
540 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
541 }
542 }
543 break;
544 }
545 case JVM_CONSTANT_InvokeDynamic:
546 case JVM_CONSTANT_Fieldref:
547 case JVM_CONSTANT_Methodref:
548 case JVM_CONSTANT_InterfaceMethodref: {
549 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
550 // already verified to be utf8
551 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
552 // already verified to be utf8
553 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
554 Symbol* name = cp->symbol_at(name_ref_index);
555 Symbol* signature = cp->symbol_at(signature_ref_index);
556 if (tag == JVM_CONSTANT_Fieldref) {
557 verify_legal_field_name(name, CHECK_(nullHandle));
558 if (_need_verify && _major_version >= JAVA_7_VERSION) {
559 // Signature is verified above, when iterating NameAndType_info.
560 // Need only to be sure it's the right type.
561 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
562 throwIllegalSignature(
563 "Field", name, signature, CHECK_(nullHandle));
564 }
565 } else {
566 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
567 }
568 } else {
569 verify_legal_method_name(name, CHECK_(nullHandle));
570 if (_need_verify && _major_version >= JAVA_7_VERSION) {
571 // Signature is verified above, when iterating NameAndType_info.
572 // Need only to be sure it's the right type.
573 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
574 throwIllegalSignature(
575 "Method", name, signature, CHECK_(nullHandle));
576 }
577 } else {
578 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
579 }
580 if (tag == JVM_CONSTANT_Methodref) {
581 // 4509014: If a class method name begins with '<', it must be "<init>".
582 assert(name != NULL, "method name in constant pool is null");
583 unsigned int name_len = name->utf8_length();
584 assert(name_len > 0, "bad method name"); // already verified as legal name
585 if (name->byte_at(0) == '<') {
586 if (name != vmSymbols::object_initializer_name()) {
587 classfile_parse_error(
588 "Bad method name at constant pool index %u in class file %s",
589 name_ref_index, CHECK_(nullHandle));
590 }
591 }
592 }
593 }
594 break;
595 }
596 case JVM_CONSTANT_MethodHandle: {
597 int ref_index = cp->method_handle_index_at(index);
598 int ref_kind = cp->method_handle_ref_kind_at(index);
599 switch (ref_kind) {
600 case JVM_REF_invokeVirtual:
601 case JVM_REF_invokeStatic:
602 case JVM_REF_invokeSpecial:
603 case JVM_REF_newInvokeSpecial:
604 {
605 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
606 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
607 Symbol* name = cp->symbol_at(name_ref_index);
608 if (ref_kind == JVM_REF_newInvokeSpecial) {
609 if (name != vmSymbols::object_initializer_name()) {
610 classfile_parse_error(
611 "Bad constructor name at constant pool index %u in class file %s",
612 name_ref_index, CHECK_(nullHandle));
613 }
614 } else {
615 if (name == vmSymbols::object_initializer_name()) {
616 classfile_parse_error(
617 "Bad method name at constant pool index %u in class file %s",
618 name_ref_index, CHECK_(nullHandle));
619 }
620 }
621 }
622 break;
623 // Other ref_kinds are already fully checked in previous pass.
624 }
625 break;
626 }
627 case JVM_CONSTANT_MethodType: {
628 Symbol* no_name = vmSymbols::type_name(); // place holder
629 Symbol* signature = cp->method_type_signature_at(index);
630 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
631 break;
632 }
633 case JVM_CONSTANT_Utf8: {
634 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
635 }
636 } // end of switch
637 } // end of for
638
639 return cp;
640 }
641
642
643 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
644 assert(EnableInvokeDynamic, "");
645 BasicType patch_type = T_VOID;
646
647 switch (cp->tag_at(index).value()) {
648
649 case JVM_CONSTANT_UnresolvedClass :
650 // Patching a class means pre-resolving it.
651 // The name in the constant pool is ignored.
652 if (java_lang_Class::is_instance(patch())) {
653 guarantee_property(!java_lang_Class::is_primitive(patch()),
654 "Illegal class patch at %d in class file %s",
655 index, CHECK);
656 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
657 } else {
658 guarantee_property(java_lang_String::is_instance(patch()),
659 "Illegal class patch at %d in class file %s",
660 index, CHECK);
661 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
662 cp->unresolved_klass_at_put(index, name);
663 }
664 break;
665
666 case JVM_CONSTANT_String :
667 // skip this patch and don't clear it. Needs the oop array for resolved
668 // references to be created first.
669 return;
670
671 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
672 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
673 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
674 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
675 patch_prim:
676 {
677 jvalue value;
678 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
679 guarantee_property(value_type == patch_type,
680 "Illegal primitive patch at %d in class file %s",
681 index, CHECK);
682 switch (value_type) {
683 case T_INT: cp->int_at_put(index, value.i); break;
684 case T_FLOAT: cp->float_at_put(index, value.f); break;
685 case T_LONG: cp->long_at_put(index, value.j); break;
686 case T_DOUBLE: cp->double_at_put(index, value.d); break;
687 default: assert(false, "");
688 }
689 }
690 break;
691
692 default:
693 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
694 guarantee_property(!has_cp_patch_at(index),
695 "Illegal unexpected patch at %d in class file %s",
696 index, CHECK);
697 return;
698 }
699
700 // On fall-through, mark the patch as used.
701 clear_cp_patch_at(index);
702 }
703
704
705
706 class NameSigHash: public ResourceObj {
707 public:
708 Symbol* _name; // name
709 Symbol* _sig; // signature
710 NameSigHash* _next; // Next entry in hash table
711 };
712
713
714 #define HASH_ROW_SIZE 256
715
716 unsigned int hash(Symbol* name, Symbol* sig) {
717 unsigned int raw_hash = 0;
718 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
719 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
720
721 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
722 }
723
724
725 void initialize_hashtable(NameSigHash** table) {
726 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
727 }
728
729 // Return false if the name/sig combination is found in table.
730 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
731 // The old format checker uses heap sort to find duplicates.
732 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
733 // of table since we don't expect Symbol*'s to move.
734 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
735 assert(name != NULL, "name in constant pool is NULL");
736
737 // First lookup for duplicates
738 int index = hash(name, sig);
739 NameSigHash* entry = table[index];
740 while (entry != NULL) {
741 if (entry->_name == name && entry->_sig == sig) {
742 return false;
743 }
744 entry = entry->_next;
745 }
746
747 // No duplicate is found, allocate a new entry and fill it.
748 entry = new NameSigHash();
749 entry->_name = name;
750 entry->_sig = sig;
751
752 // Insert into hash table
753 entry->_next = table[index];
754 table[index] = entry;
755
756 return true;
757 }
758
759
760 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
761 Handle protection_domain,
762 Symbol* class_name,
763 bool* has_default_methods,
764 TRAPS) {
765 if (length == 0) {
766 _local_interfaces = Universe::the_empty_klass_array();
767 } else {
768 ClassFileStream* cfs = stream();
769 assert(length > 0, "only called for length>0");
770 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
771
772 int index;
773 for (index = 0; index < length; index++) {
774 u2 interface_index = cfs->get_u2(CHECK_NULL);
775 KlassHandle interf;
776 check_property(
777 valid_klass_reference_at(interface_index),
778 "Interface name has bad constant pool index %u in class file %s",
779 interface_index, CHECK_NULL);
780 if (_cp->tag_at(interface_index).is_klass()) {
781 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
782 } else {
783 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
784
785 // Don't need to check legal name because it's checked when parsing constant pool.
786 // But need to make sure it's not an array type.
787 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
788 "Bad interface name in class file %s", CHECK_NULL);
789 Handle class_loader(THREAD, _loader_data->class_loader());
790
791 // Call resolve_super so classcircularity is checked
792 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
793 unresolved_klass, class_loader, protection_domain,
794 false, CHECK_NULL);
795 interf = KlassHandle(THREAD, k);
796 }
797
798 if (!interf()->is_interface()) {
799 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
800 }
801 if (InstanceKlass::cast(interf())->has_default_methods()) {
802 *has_default_methods = true;
803 }
804 _local_interfaces->at_put(index, interf());
805 }
806
807 if (!_need_verify || length <= 1) {
808 return _local_interfaces;
809 }
810
811 // Check if there's any duplicates in interfaces
812 ResourceMark rm(THREAD);
813 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
814 THREAD, NameSigHash*, HASH_ROW_SIZE);
815 initialize_hashtable(interface_names);
816 bool dup = false;
817 {
818 debug_only(No_Safepoint_Verifier nsv;)
819 for (index = 0; index < length; index++) {
820 Klass* k = _local_interfaces->at(index);
821 Symbol* name = InstanceKlass::cast(k)->name();
822 // If no duplicates, add (name, NULL) in hashtable interface_names.
823 if (!put_after_lookup(name, NULL, interface_names)) {
824 dup = true;
825 break;
826 }
827 }
828 }
829 if (dup) {
830 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
831 }
832 }
833 return _local_interfaces;
834 }
835
836
837 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
838 // Make sure the constant pool entry is of a type appropriate to this field
839 guarantee_property(
840 (constantvalue_index > 0 &&
841 constantvalue_index < _cp->length()),
842 "Bad initial value index %u in ConstantValue attribute in class file %s",
843 constantvalue_index, CHECK);
844 constantTag value_type = _cp->tag_at(constantvalue_index);
845 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
846 case T_LONG:
847 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
848 break;
849 case T_FLOAT:
850 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
851 break;
852 case T_DOUBLE:
853 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
854 break;
855 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
856 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
857 break;
858 case T_OBJECT:
859 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
860 && value_type.is_string()),
861 "Bad string initial value in class file %s", CHECK);
862 break;
863 default:
864 classfile_parse_error(
865 "Unable to set initial value %u in class file %s",
866 constantvalue_index, CHECK);
867 }
868 }
869
870
871 // Parse attributes for a field.
872 void ClassFileParser::parse_field_attributes(u2 attributes_count,
873 bool is_static, u2 signature_index,
874 u2* constantvalue_index_addr,
875 bool* is_synthetic_addr,
876 u2* generic_signature_index_addr,
877 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
878 TRAPS) {
879 ClassFileStream* cfs = stream();
880 assert(attributes_count > 0, "length should be greater than 0");
881 u2 constantvalue_index = 0;
882 u2 generic_signature_index = 0;
883 bool is_synthetic = false;
884 u1* runtime_visible_annotations = NULL;
885 int runtime_visible_annotations_length = 0;
886 u1* runtime_invisible_annotations = NULL;
887 int runtime_invisible_annotations_length = 0;
888 u1* runtime_visible_type_annotations = NULL;
889 int runtime_visible_type_annotations_length = 0;
890 u1* runtime_invisible_type_annotations = NULL;
891 int runtime_invisible_type_annotations_length = 0;
892 while (attributes_count--) {
893 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
894 u2 attribute_name_index = cfs->get_u2_fast();
895 u4 attribute_length = cfs->get_u4_fast();
896 check_property(valid_symbol_at(attribute_name_index),
897 "Invalid field attribute index %u in class file %s",
898 attribute_name_index,
899 CHECK);
900 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
901 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
902 // ignore if non-static
903 if (constantvalue_index != 0) {
904 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
905 }
906 check_property(
907 attribute_length == 2,
908 "Invalid ConstantValue field attribute length %u in class file %s",
909 attribute_length, CHECK);
910 constantvalue_index = cfs->get_u2(CHECK);
911 if (_need_verify) {
912 verify_constantvalue(constantvalue_index, signature_index, CHECK);
913 }
914 } else if (attribute_name == vmSymbols::tag_synthetic()) {
915 if (attribute_length != 0) {
916 classfile_parse_error(
917 "Invalid Synthetic field attribute length %u in class file %s",
918 attribute_length, CHECK);
919 }
920 is_synthetic = true;
921 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
922 if (attribute_length != 0) {
923 classfile_parse_error(
924 "Invalid Deprecated field attribute length %u in class file %s",
925 attribute_length, CHECK);
926 }
927 } else if (_major_version >= JAVA_1_5_VERSION) {
928 if (attribute_name == vmSymbols::tag_signature()) {
929 if (attribute_length != 2) {
930 classfile_parse_error(
931 "Wrong size %u for field's Signature attribute in class file %s",
932 attribute_length, CHECK);
933 }
934 generic_signature_index = cfs->get_u2(CHECK);
935 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
936 runtime_visible_annotations_length = attribute_length;
937 runtime_visible_annotations = cfs->get_u1_buffer();
938 assert(runtime_visible_annotations != NULL, "null visible annotations");
939 parse_annotations(runtime_visible_annotations,
940 runtime_visible_annotations_length,
941 parsed_annotations,
942 CHECK);
943 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
944 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
945 runtime_invisible_annotations_length = attribute_length;
946 runtime_invisible_annotations = cfs->get_u1_buffer();
947 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
948 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
949 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
950 runtime_visible_type_annotations_length = attribute_length;
951 runtime_visible_type_annotations = cfs->get_u1_buffer();
952 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
953 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
954 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
955 runtime_invisible_type_annotations_length = attribute_length;
956 runtime_invisible_type_annotations = cfs->get_u1_buffer();
957 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
958 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
959 } else {
960 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
961 }
962 } else {
963 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
964 }
965 }
966
967 *constantvalue_index_addr = constantvalue_index;
968 *is_synthetic_addr = is_synthetic;
969 *generic_signature_index_addr = generic_signature_index;
970 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
971 runtime_visible_annotations_length,
972 runtime_invisible_annotations,
973 runtime_invisible_annotations_length,
974 CHECK);
975 parsed_annotations->set_field_annotations(a);
976 a = assemble_annotations(runtime_visible_type_annotations,
977 runtime_visible_type_annotations_length,
978 runtime_invisible_type_annotations,
979 runtime_invisible_type_annotations_length,
980 CHECK);
981 parsed_annotations->set_field_type_annotations(a);
982 return;
983 }
984
985
986 // Field allocation types. Used for computing field offsets.
987
988 enum FieldAllocationType {
989 STATIC_OOP, // Oops
990 STATIC_BYTE, // Boolean, Byte, char
991 STATIC_SHORT, // shorts
992 STATIC_WORD, // ints
993 STATIC_DOUBLE, // aligned long or double
994 NONSTATIC_OOP,
995 NONSTATIC_BYTE,
996 NONSTATIC_SHORT,
997 NONSTATIC_WORD,
998 NONSTATIC_DOUBLE,
999 MAX_FIELD_ALLOCATION_TYPE,
1000 BAD_ALLOCATION_TYPE = -1
1001 };
1002
1003 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1004 BAD_ALLOCATION_TYPE, // 0
1005 BAD_ALLOCATION_TYPE, // 1
1006 BAD_ALLOCATION_TYPE, // 2
1007 BAD_ALLOCATION_TYPE, // 3
1008 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1009 NONSTATIC_SHORT, // T_CHAR = 5,
1010 NONSTATIC_WORD, // T_FLOAT = 6,
1011 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1012 NONSTATIC_BYTE, // T_BYTE = 8,
1013 NONSTATIC_SHORT, // T_SHORT = 9,
1014 NONSTATIC_WORD, // T_INT = 10,
1015 NONSTATIC_DOUBLE, // T_LONG = 11,
1016 NONSTATIC_OOP, // T_OBJECT = 12,
1017 NONSTATIC_OOP, // T_ARRAY = 13,
1018 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1019 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1020 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1021 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1022 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1023 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1024 BAD_ALLOCATION_TYPE, // 0
1025 BAD_ALLOCATION_TYPE, // 1
1026 BAD_ALLOCATION_TYPE, // 2
1027 BAD_ALLOCATION_TYPE, // 3
1028 STATIC_BYTE , // T_BOOLEAN = 4,
1029 STATIC_SHORT, // T_CHAR = 5,
1030 STATIC_WORD, // T_FLOAT = 6,
1031 STATIC_DOUBLE, // T_DOUBLE = 7,
1032 STATIC_BYTE, // T_BYTE = 8,
1033 STATIC_SHORT, // T_SHORT = 9,
1034 STATIC_WORD, // T_INT = 10,
1035 STATIC_DOUBLE, // T_LONG = 11,
1036 STATIC_OOP, // T_OBJECT = 12,
1037 STATIC_OOP, // T_ARRAY = 13,
1038 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1039 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1040 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1041 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1042 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1043 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1044 };
1045
1046 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1047 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1048 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1049 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1050 return result;
1051 }
1052
1053 class FieldAllocationCount: public ResourceObj {
1054 public:
1055 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1056
1057 FieldAllocationCount() {
1058 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1059 count[i] = 0;
1060 }
1061 }
1062
1063 FieldAllocationType update(bool is_static, BasicType type) {
1064 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1065 // Make sure there is no overflow with injected fields.
1066 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1067 count[atype]++;
1068 return atype;
1069 }
1070 };
1071
1072 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1073 bool is_interface,
1074 FieldAllocationCount *fac,
1075 u2* java_fields_count_ptr, TRAPS) {
1076 ClassFileStream* cfs = stream();
1077 cfs->guarantee_more(2, CHECK_NULL); // length
1078 u2 length = cfs->get_u2_fast();
1079 *java_fields_count_ptr = length;
1080
1081 int num_injected = 0;
1082 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1083 int total_fields = length + num_injected;
1084
1085 // The field array starts with tuples of shorts
1086 // [access, name index, sig index, initial value index, byte offset].
1087 // A generic signature slot only exists for field with generic
1088 // signature attribute. And the access flag is set with
1089 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1090 // signature slots are at the end of the field array and after all
1091 // other fields data.
1092 //
1093 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1094 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1095 // ...
1096 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1097 // [generic signature index]
1098 // [generic signature index]
1099 // ...
1100 //
1101 // Allocate a temporary resource array for field data. For each field,
1102 // a slot is reserved in the temporary array for the generic signature
1103 // index. After parsing all fields, the data are copied to a permanent
1104 // array and any unused slots will be discarded.
1105 ResourceMark rm(THREAD);
1106 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1107 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1108
1109 // The generic signature slots start after all other fields' data.
1110 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1111 int num_generic_signature = 0;
1112 for (int n = 0; n < length; n++) {
1113 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1114
1115 AccessFlags access_flags;
1116 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1117 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1118 access_flags.set_flags(flags);
1119
1120 u2 name_index = cfs->get_u2_fast();
1121 int cp_size = _cp->length();
1122 check_property(valid_symbol_at(name_index),
1123 "Invalid constant pool index %u for field name in class file %s",
1124 name_index,
1125 CHECK_NULL);
1126 Symbol* name = _cp->symbol_at(name_index);
1127 verify_legal_field_name(name, CHECK_NULL);
1128
1129 u2 signature_index = cfs->get_u2_fast();
1130 check_property(valid_symbol_at(signature_index),
1131 "Invalid constant pool index %u for field signature in class file %s",
1132 signature_index, CHECK_NULL);
1133 Symbol* sig = _cp->symbol_at(signature_index);
1134 verify_legal_field_signature(name, sig, CHECK_NULL);
1135
1136 u2 constantvalue_index = 0;
1137 bool is_synthetic = false;
1138 u2 generic_signature_index = 0;
1139 bool is_static = access_flags.is_static();
1140 FieldAnnotationCollector parsed_annotations(_loader_data);
1141
1142 u2 attributes_count = cfs->get_u2_fast();
1143 if (attributes_count > 0) {
1144 parse_field_attributes(attributes_count, is_static, signature_index,
1145 &constantvalue_index, &is_synthetic,
1146 &generic_signature_index, &parsed_annotations,
1147 CHECK_NULL);
1148 if (parsed_annotations.field_annotations() != NULL) {
1149 if (_fields_annotations == NULL) {
1150 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1151 _loader_data, length, NULL,
1152 CHECK_NULL);
1153 }
1154 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1155 parsed_annotations.set_field_annotations(NULL);
1156 }
1157 if (parsed_annotations.field_type_annotations() != NULL) {
1158 if (_fields_type_annotations == NULL) {
1159 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1160 _loader_data, length, NULL,
1161 CHECK_NULL);
1162 }
1163 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1164 parsed_annotations.set_field_type_annotations(NULL);
1165 }
1166
1167 if (is_synthetic) {
1168 access_flags.set_is_synthetic();
1169 }
1170 if (generic_signature_index != 0) {
1171 access_flags.set_field_has_generic_signature();
1172 fa[generic_signature_slot] = generic_signature_index;
1173 generic_signature_slot ++;
1174 num_generic_signature ++;
1175 }
1176 }
1177
1178 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1179 field->initialize(access_flags.as_short(),
1180 name_index,
1181 signature_index,
1182 constantvalue_index);
1183 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1184
1185 // Remember how many oops we encountered and compute allocation type
1186 FieldAllocationType atype = fac->update(is_static, type);
1187 field->set_allocation_type(atype);
1188
1189 // After field is initialized with type, we can augment it with aux info
1190 if (parsed_annotations.has_any_annotations())
1191 parsed_annotations.apply_to(field);
1192 }
1193
1194 int index = length;
1195 if (num_injected != 0) {
1196 for (int n = 0; n < num_injected; n++) {
1197 // Check for duplicates
1198 if (injected[n].may_be_java) {
1199 Symbol* name = injected[n].name();
1200 Symbol* signature = injected[n].signature();
1201 bool duplicate = false;
1202 for (int i = 0; i < length; i++) {
1203 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1204 if (name == _cp->symbol_at(f->name_index()) &&
1205 signature == _cp->symbol_at(f->signature_index())) {
1206 // Symbol is desclared in Java so skip this one
1207 duplicate = true;
1208 break;
1209 }
1210 }
1211 if (duplicate) {
1212 // These will be removed from the field array at the end
1213 continue;
1214 }
1215 }
1216
1217 // Injected field
1218 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1219 field->initialize(JVM_ACC_FIELD_INTERNAL,
1220 injected[n].name_index,
1221 injected[n].signature_index,
1222 0);
1223
1224 BasicType type = FieldType::basic_type(injected[n].signature());
1225
1226 // Remember how many oops we encountered and compute allocation type
1227 FieldAllocationType atype = fac->update(false, type);
1228 field->set_allocation_type(atype);
1229 index++;
1230 }
1231 }
1232
1233 // Now copy the fields' data from the temporary resource array.
1234 // Sometimes injected fields already exist in the Java source so
1235 // the fields array could be too long. In that case the
1236 // fields array is trimed. Also unused slots that were reserved
1237 // for generic signature indexes are discarded.
1238 Array<u2>* fields = MetadataFactory::new_array<u2>(
1239 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1240 CHECK_NULL);
1241 _fields = fields; // save in case of error
1242 {
1243 int i = 0;
1244 for (; i < index * FieldInfo::field_slots; i++) {
1245 fields->at_put(i, fa[i]);
1246 }
1247 for (int j = total_fields * FieldInfo::field_slots;
1248 j < generic_signature_slot; j++) {
1249 fields->at_put(i++, fa[j]);
1250 }
1251 assert(i == fields->length(), "");
1252 }
1253
1254 if (_need_verify && length > 1) {
1255 // Check duplicated fields
1256 ResourceMark rm(THREAD);
1257 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1258 THREAD, NameSigHash*, HASH_ROW_SIZE);
1259 initialize_hashtable(names_and_sigs);
1260 bool dup = false;
1261 {
1262 debug_only(No_Safepoint_Verifier nsv;)
1263 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1264 Symbol* name = fs.name();
1265 Symbol* sig = fs.signature();
1266 // If no duplicates, add name/signature in hashtable names_and_sigs.
1267 if (!put_after_lookup(name, sig, names_and_sigs)) {
1268 dup = true;
1269 break;
1270 }
1271 }
1272 }
1273 if (dup) {
1274 classfile_parse_error("Duplicate field name&signature in class file %s",
1275 CHECK_NULL);
1276 }
1277 }
1278
1279 return fields;
1280 }
1281
1282
1283 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1284 while (length-- > 0) {
1285 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1286 }
1287 }
1288
1289
1290 u2* ClassFileParser::parse_exception_table(u4 code_length,
1291 u4 exception_table_length,
1292 TRAPS) {
1293 ClassFileStream* cfs = stream();
1294
1295 u2* exception_table_start = cfs->get_u2_buffer();
1296 assert(exception_table_start != NULL, "null exception table");
1297 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1298 // Will check legal target after parsing code array in verifier.
1299 if (_need_verify) {
1300 for (unsigned int i = 0; i < exception_table_length; i++) {
1301 u2 start_pc = cfs->get_u2_fast();
1302 u2 end_pc = cfs->get_u2_fast();
1303 u2 handler_pc = cfs->get_u2_fast();
1304 u2 catch_type_index = cfs->get_u2_fast();
1305 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1306 "Illegal exception table range in class file %s",
1307 CHECK_NULL);
1308 guarantee_property(handler_pc < code_length,
1309 "Illegal exception table handler in class file %s",
1310 CHECK_NULL);
1311 if (catch_type_index != 0) {
1312 guarantee_property(valid_klass_reference_at(catch_type_index),
1313 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1314 }
1315 }
1316 } else {
1317 cfs->skip_u2_fast(exception_table_length * 4);
1318 }
1319 return exception_table_start;
1320 }
1321
1322 void ClassFileParser::parse_linenumber_table(
1323 u4 code_attribute_length, u4 code_length,
1324 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1325 ClassFileStream* cfs = stream();
1326 unsigned int num_entries = cfs->get_u2(CHECK);
1327
1328 // Each entry is a u2 start_pc, and a u2 line_number
1329 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1330
1331 // Verify line number attribute and table length
1332 check_property(
1333 code_attribute_length == sizeof(u2) + length_in_bytes,
1334 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1335
1336 cfs->guarantee_more(length_in_bytes, CHECK);
1337
1338 if ((*write_stream) == NULL) {
1339 if (length_in_bytes > fixed_buffer_size) {
1340 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1341 } else {
1342 (*write_stream) = new CompressedLineNumberWriteStream(
1343 linenumbertable_buffer, fixed_buffer_size);
1344 }
1345 }
1346
1347 while (num_entries-- > 0) {
1348 u2 bci = cfs->get_u2_fast(); // start_pc
1349 u2 line = cfs->get_u2_fast(); // line_number
1350 guarantee_property(bci < code_length,
1351 "Invalid pc in LineNumberTable in class file %s", CHECK);
1352 (*write_stream)->write_pair(bci, line);
1353 }
1354 }
1355
1356
1357 // Class file LocalVariableTable elements.
1358 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1359 public:
1360 u2 start_bci;
1361 u2 length;
1362 u2 name_cp_index;
1363 u2 descriptor_cp_index;
1364 u2 slot;
1365 };
1366
1367
1368 class LVT_Hash: public CHeapObj<mtClass> {
1369 public:
1370 LocalVariableTableElement *_elem; // element
1371 LVT_Hash* _next; // Next entry in hash table
1372 };
1373
1374 unsigned int hash(LocalVariableTableElement *elem) {
1375 unsigned int raw_hash = elem->start_bci;
1376
1377 raw_hash = elem->length + raw_hash * 37;
1378 raw_hash = elem->name_cp_index + raw_hash * 37;
1379 raw_hash = elem->slot + raw_hash * 37;
1380
1381 return raw_hash % HASH_ROW_SIZE;
1382 }
1383
1384 void initialize_hashtable(LVT_Hash** table) {
1385 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1386 table[i] = NULL;
1387 }
1388 }
1389
1390 void clear_hashtable(LVT_Hash** table) {
1391 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1392 LVT_Hash* current = table[i];
1393 LVT_Hash* next;
1394 while (current != NULL) {
1395 next = current->_next;
1396 current->_next = NULL;
1397 delete(current);
1398 current = next;
1399 }
1400 table[i] = NULL;
1401 }
1402 }
1403
1404 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1405 LVT_Hash* entry = table[index];
1406
1407 /*
1408 * 3-tuple start_bci/length/slot has to be unique key,
1409 * so the following comparison seems to be redundant:
1410 * && elem->name_cp_index == entry->_elem->name_cp_index
1411 */
1412 while (entry != NULL) {
1413 if (elem->start_bci == entry->_elem->start_bci
1414 && elem->length == entry->_elem->length
1415 && elem->name_cp_index == entry->_elem->name_cp_index
1416 && elem->slot == entry->_elem->slot
1417 ) {
1418 return entry;
1419 }
1420 entry = entry->_next;
1421 }
1422 return NULL;
1423 }
1424
1425 // Return false if the local variable is found in table.
1426 // Return true if no duplicate is found.
1427 // And local variable is added as a new entry in table.
1428 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1429 // First lookup for duplicates
1430 int index = hash(elem);
1431 LVT_Hash* entry = LVT_lookup(elem, index, table);
1432
1433 if (entry != NULL) {
1434 return false;
1435 }
1436 // No duplicate is found, allocate a new entry and fill it.
1437 if ((entry = new LVT_Hash()) == NULL) {
1438 return false;
1439 }
1440 entry->_elem = elem;
1441
1442 // Insert into hash table
1443 entry->_next = table[index];
1444 table[index] = entry;
1445
1446 return true;
1447 }
1448
1449 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1450 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1451 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1452 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1453 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1454 lvt->signature_cp_index = 0;
1455 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1456 }
1457
1458 // Function is used to parse both attributes:
1459 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1460 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1461 u2 max_locals,
1462 u4 code_attribute_length,
1463 u2* localvariable_table_length,
1464 bool isLVTT,
1465 TRAPS) {
1466 ClassFileStream* cfs = stream();
1467 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1468 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1469 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1470 // Verify local variable table attribute has right length
1471 if (_need_verify) {
1472 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1473 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1474 }
1475 u2* localvariable_table_start = cfs->get_u2_buffer();
1476 assert(localvariable_table_start != NULL, "null local variable table");
1477 if (!_need_verify) {
1478 cfs->skip_u2_fast(size);
1479 } else {
1480 cfs->guarantee_more(size * 2, CHECK_NULL);
1481 for(int i = 0; i < (*localvariable_table_length); i++) {
1482 u2 start_pc = cfs->get_u2_fast();
1483 u2 length = cfs->get_u2_fast();
1484 u2 name_index = cfs->get_u2_fast();
1485 u2 descriptor_index = cfs->get_u2_fast();
1486 u2 index = cfs->get_u2_fast();
1487 // Assign to a u4 to avoid overflow
1488 u4 end_pc = (u4)start_pc + (u4)length;
1489
1490 if (start_pc >= code_length) {
1491 classfile_parse_error(
1492 "Invalid start_pc %u in %s in class file %s",
1493 start_pc, tbl_name, CHECK_NULL);
1494 }
1495 if (end_pc > code_length) {
1496 classfile_parse_error(
1497 "Invalid length %u in %s in class file %s",
1498 length, tbl_name, CHECK_NULL);
1499 }
1500 int cp_size = _cp->length();
1501 guarantee_property(valid_symbol_at(name_index),
1502 "Name index %u in %s has bad constant type in class file %s",
1503 name_index, tbl_name, CHECK_NULL);
1504 guarantee_property(valid_symbol_at(descriptor_index),
1505 "Signature index %u in %s has bad constant type in class file %s",
1506 descriptor_index, tbl_name, CHECK_NULL);
1507
1508 Symbol* name = _cp->symbol_at(name_index);
1509 Symbol* sig = _cp->symbol_at(descriptor_index);
1510 verify_legal_field_name(name, CHECK_NULL);
1511 u2 extra_slot = 0;
1512 if (!isLVTT) {
1513 verify_legal_field_signature(name, sig, CHECK_NULL);
1514
1515 // 4894874: check special cases for double and long local variables
1516 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1517 sig == vmSymbols::type_signature(T_LONG)) {
1518 extra_slot = 1;
1519 }
1520 }
1521 guarantee_property((index + extra_slot) < max_locals,
1522 "Invalid index %u in %s in class file %s",
1523 index, tbl_name, CHECK_NULL);
1524 }
1525 }
1526 return localvariable_table_start;
1527 }
1528
1529
1530 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1531 u1* u1_array, u2* u2_array, TRAPS) {
1532 ClassFileStream* cfs = stream();
1533 u2 index = 0; // index in the array with long/double occupying two slots
1534 u4 i1 = *u1_index;
1535 u4 i2 = *u2_index + 1;
1536 for(int i = 0; i < array_length; i++) {
1537 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1538 index++;
1539 if (tag == ITEM_Long || tag == ITEM_Double) {
1540 index++;
1541 } else if (tag == ITEM_Object) {
1542 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1543 guarantee_property(valid_klass_reference_at(class_index),
1544 "Bad class index %u in StackMap in class file %s",
1545 class_index, CHECK);
1546 } else if (tag == ITEM_Uninitialized) {
1547 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1548 guarantee_property(
1549 offset < code_length,
1550 "Bad uninitialized type offset %u in StackMap in class file %s",
1551 offset, CHECK);
1552 } else {
1553 guarantee_property(
1554 tag <= (u1)ITEM_Uninitialized,
1555 "Unknown variable type %u in StackMap in class file %s",
1556 tag, CHECK);
1557 }
1558 }
1559 u2_array[*u2_index] = index;
1560 *u1_index = i1;
1561 *u2_index = i2;
1562 }
1563
1564 u1* ClassFileParser::parse_stackmap_table(
1565 u4 code_attribute_length, TRAPS) {
1566 if (code_attribute_length == 0)
1567 return NULL;
1568
1569 ClassFileStream* cfs = stream();
1570 u1* stackmap_table_start = cfs->get_u1_buffer();
1571 assert(stackmap_table_start != NULL, "null stackmap table");
1572
1573 // check code_attribute_length first
1574 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1575
1576 if (!_need_verify && !DumpSharedSpaces) {
1577 return NULL;
1578 }
1579 return stackmap_table_start;
1580 }
1581
1582 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1583 u4 method_attribute_length,
1584 TRAPS) {
1585 ClassFileStream* cfs = stream();
1586 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1587 *checked_exceptions_length = cfs->get_u2_fast();
1588 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1589 u2* checked_exceptions_start = cfs->get_u2_buffer();
1590 assert(checked_exceptions_start != NULL, "null checked exceptions");
1591 if (!_need_verify) {
1592 cfs->skip_u2_fast(size);
1593 } else {
1594 // Verify each value in the checked exception table
1595 u2 checked_exception;
1596 u2 len = *checked_exceptions_length;
1597 cfs->guarantee_more(2 * len, CHECK_NULL);
1598 for (int i = 0; i < len; i++) {
1599 checked_exception = cfs->get_u2_fast();
1600 check_property(
1601 valid_klass_reference_at(checked_exception),
1602 "Exception name has bad type at constant pool %u in class file %s",
1603 checked_exception, CHECK_NULL);
1604 }
1605 }
1606 // check exceptions attribute length
1607 if (_need_verify) {
1608 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1609 sizeof(u2) * size),
1610 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1611 }
1612 return checked_exceptions_start;
1613 }
1614
1615 void ClassFileParser::throwIllegalSignature(
1616 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1617 ResourceMark rm(THREAD);
1618 Exceptions::fthrow(THREAD_AND_LOCATION,
1619 vmSymbols::java_lang_ClassFormatError(),
1620 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1621 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1622 }
1623
1624 // Skip an annotation. Return >=limit if there is any problem.
1625 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1626 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1627 // value := switch (tag:u1) { ... }
1628 index += 2; // skip atype
1629 if ((index += 2) >= limit) return limit; // read nmem
1630 int nmem = Bytes::get_Java_u2(buffer+index-2);
1631 while (--nmem >= 0 && index < limit) {
1632 index += 2; // skip member
1633 index = skip_annotation_value(buffer, limit, index);
1634 }
1635 return index;
1636 }
1637
1638 // Skip an annotation value. Return >=limit if there is any problem.
1639 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1640 // value := switch (tag:u1) {
1641 // case B, C, I, S, Z, D, F, J, c: con:u2;
1642 // case e: e_class:u2 e_name:u2;
1643 // case s: s_con:u2;
1644 // case [: do(nval:u2) {value};
1645 // case @: annotation;
1646 // case s: s_con:u2;
1647 // }
1648 if ((index += 1) >= limit) return limit; // read tag
1649 u1 tag = buffer[index-1];
1650 switch (tag) {
1651 case 'B': case 'C': case 'I': case 'S': case 'Z':
1652 case 'D': case 'F': case 'J': case 'c': case 's':
1653 index += 2; // skip con or s_con
1654 break;
1655 case 'e':
1656 index += 4; // skip e_class, e_name
1657 break;
1658 case '[':
1659 {
1660 if ((index += 2) >= limit) return limit; // read nval
1661 int nval = Bytes::get_Java_u2(buffer+index-2);
1662 while (--nval >= 0 && index < limit) {
1663 index = skip_annotation_value(buffer, limit, index);
1664 }
1665 }
1666 break;
1667 case '@':
1668 index = skip_annotation(buffer, limit, index);
1669 break;
1670 default:
1671 assert(false, "annotation tag");
1672 return limit; // bad tag byte
1673 }
1674 return index;
1675 }
1676
1677 // Sift through annotations, looking for those significant to the VM:
1678 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1679 ClassFileParser::AnnotationCollector* coll,
1680 TRAPS) {
1681 // annotations := do(nann:u2) {annotation}
1682 int index = 0;
1683 if ((index += 2) >= limit) return; // read nann
1684 int nann = Bytes::get_Java_u2(buffer+index-2);
1685 enum { // initial annotation layout
1686 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1687 count_off = 2, // u2 such as 1 (one value)
1688 member_off = 4, // utf8 such as 'value'
1689 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1690 e_tag_val = 'e',
1691 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1692 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1693 e_size = 11, // end of 'e' annotation
1694 c_tag_val = 'c', // payload is type
1695 c_con_off = 7, // utf8 payload, such as 'I'
1696 c_size = 9, // end of 'c' annotation
1697 s_tag_val = 's', // payload is String
1698 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1699 s_size = 9,
1700 min_size = 6 // smallest possible size (zero members)
1701 };
1702 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1703 int index0 = index;
1704 index = skip_annotation(buffer, limit, index);
1705 u1* abase = buffer + index0;
1706 int atype = Bytes::get_Java_u2(abase + atype_off);
1707 int count = Bytes::get_Java_u2(abase + count_off);
1708 Symbol* aname = check_symbol_at(_cp, atype);
1709 if (aname == NULL) break; // invalid annotation name
1710 Symbol* member = NULL;
1711 if (count >= 1) {
1712 int member_index = Bytes::get_Java_u2(abase + member_off);
1713 member = check_symbol_at(_cp, member_index);
1714 if (member == NULL) break; // invalid member name
1715 }
1716
1717 // Here is where parsing particular annotations will take place.
1718 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1719 if (id == AnnotationCollector::_unknown) continue;
1720 coll->set_annotation(id);
1721
1722 if (id == AnnotationCollector::_sun_misc_Contended) {
1723 // @Contended can optionally specify the contention group.
1724 //
1725 // Contended group defines the equivalence class over the fields:
1726 // the fields within the same contended group are not treated distinct.
1727 // The only exception is default group, which does not incur the
1728 // equivalence. Naturally, contention group for classes is meaningless.
1729 //
1730 // While the contention group is specified as String, annotation
1731 // values are already interned, and we might as well use the constant
1732 // pool index as the group tag.
1733 //
1734 u2 group_index = 0; // default contended group
1735 if (count == 1
1736 && s_size == (index - index0) // match size
1737 && s_tag_val == *(abase + tag_off)
1738 && member == vmSymbols::value_name()) {
1739 group_index = Bytes::get_Java_u2(abase + s_con_off);
1740 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1741 group_index = 0; // default contended group
1742 }
1743 }
1744 coll->set_contended_group(group_index);
1745 }
1746 }
1747 }
1748
1749 ClassFileParser::AnnotationCollector::ID
1750 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1751 Symbol* name) {
1752 vmSymbols::SID sid = vmSymbols::find_sid(name);
1753 // Privileged code can use all annotations. Other code silently drops some.
1754 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1755 loader_data->is_ext_class_loader_data() ||
1756 loader_data->is_anonymous();
1757 switch (sid) {
1758 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1759 if (_location != _in_method) break; // only allow for methods
1760 if (!privileged) break; // only allow in privileged code
1761 return _method_CallerSensitive;
1762 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1763 if (_location != _in_method) break; // only allow for methods
1764 if (!privileged) break; // only allow in privileged code
1765 return _method_ForceInline;
1766 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1767 if (_location != _in_method) break; // only allow for methods
1768 if (!privileged) break; // only allow in privileged code
1769 return _method_DontInline;
1770 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1771 if (_location != _in_method) break; // only allow for methods
1772 if (!privileged) break; // only allow in privileged code
1773 return _method_LambdaForm_Compiled;
1774 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1775 if (_location != _in_method) break; // only allow for methods
1776 if (!privileged) break; // only allow in privileged code
1777 return _method_LambdaForm_Hidden;
1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_invoke_Stable_signature):
1779 if (_location != _in_field) break; // only allow for fields
1780 if (!privileged) break; // only allow in privileged code
1781 return _field_Stable;
1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1783 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1784 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1785 return _sun_misc_Contended;
1786 default: break;
1787 }
1788 return AnnotationCollector::_unknown;
1789 }
1790
1791 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1792 if (is_contended())
1793 f->set_contended_group(contended_group());
1794 if (is_stable())
1795 f->set_stable(true);
1796 }
1797
1798 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1799 // If there's an error deallocate metadata for field annotations
1800 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1801 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1802 }
1803
1804 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1805 if (has_annotation(_method_CallerSensitive))
1806 m->set_caller_sensitive(true);
1807 if (has_annotation(_method_ForceInline))
1808 m->set_force_inline(true);
1809 if (has_annotation(_method_DontInline))
1810 m->set_dont_inline(true);
1811 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1812 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1813 if (has_annotation(_method_LambdaForm_Hidden))
1814 m->set_hidden(true);
1815 }
1816
1817 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1818 k->set_is_contended(is_contended());
1819 }
1820
1821
1822 #define MAX_ARGS_SIZE 255
1823 #define MAX_CODE_SIZE 65535
1824 #define INITIAL_MAX_LVT_NUMBER 256
1825
1826 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1827 *
1828 * Rules for LVT's and LVTT's are:
1829 * - There can be any number of LVT's and LVTT's.
1830 * - If there are n LVT's, it is the same as if there was just
1831 * one LVT containing all the entries from the n LVT's.
1832 * - There may be no more than one LVT entry per local variable.
1833 * Two LVT entries are 'equal' if these fields are the same:
1834 * start_pc, length, name, slot
1835 * - There may be no more than one LVTT entry per each LVT entry.
1836 * Each LVTT entry has to match some LVT entry.
1837 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1838 */
1839 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1840 int lvt_cnt,
1841 u2* localvariable_table_length,
1842 u2** localvariable_table_start,
1843 int lvtt_cnt,
1844 u2* localvariable_type_table_length,
1845 u2** localvariable_type_table_start,
1846 TRAPS) {
1847
1848 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1849 initialize_hashtable(lvt_Hash);
1850
1851 // To fill LocalVariableTable in
1852 Classfile_LVT_Element* cf_lvt;
1853 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1854
1855 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1856 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1857 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1858 copy_lvt_element(&cf_lvt[idx], lvt);
1859 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1860 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1861 && _need_verify
1862 && _major_version >= JAVA_1_5_VERSION) {
1863 clear_hashtable(lvt_Hash);
1864 classfile_parse_error("Duplicated LocalVariableTable attribute "
1865 "entry for '%s' in class file %s",
1866 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1867 CHECK);
1868 }
1869 }
1870 }
1871
1872 // To merge LocalVariableTable and LocalVariableTypeTable
1873 Classfile_LVT_Element* cf_lvtt;
1874 LocalVariableTableElement lvtt_elem;
1875
1876 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1877 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1878 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1879 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1880 int index = hash(&lvtt_elem);
1881 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1882 if (entry == NULL) {
1883 if (_need_verify) {
1884 clear_hashtable(lvt_Hash);
1885 classfile_parse_error("LVTT entry for '%s' in class file %s "
1886 "does not match any LVT entry",
1887 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1888 CHECK);
1889 }
1890 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1891 clear_hashtable(lvt_Hash);
1892 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1893 "entry for '%s' in class file %s",
1894 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1895 CHECK);
1896 } else {
1897 // to add generic signatures into LocalVariableTable
1898 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1899 }
1900 }
1901 }
1902 clear_hashtable(lvt_Hash);
1903 }
1904
1905
1906 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1907 u1* runtime_visible_annotations,
1908 int runtime_visible_annotations_length,
1909 u1* runtime_invisible_annotations,
1910 int runtime_invisible_annotations_length,
1911 u1* runtime_visible_parameter_annotations,
1912 int runtime_visible_parameter_annotations_length,
1913 u1* runtime_invisible_parameter_annotations,
1914 int runtime_invisible_parameter_annotations_length,
1915 u1* runtime_visible_type_annotations,
1916 int runtime_visible_type_annotations_length,
1917 u1* runtime_invisible_type_annotations,
1918 int runtime_invisible_type_annotations_length,
1919 u1* annotation_default,
1920 int annotation_default_length,
1921 TRAPS) {
1922
1923 AnnotationArray* a;
1924
1925 if (runtime_visible_annotations_length +
1926 runtime_invisible_annotations_length > 0) {
1927 a = assemble_annotations(runtime_visible_annotations,
1928 runtime_visible_annotations_length,
1929 runtime_invisible_annotations,
1930 runtime_invisible_annotations_length,
1931 CHECK);
1932 cm->set_method_annotations(a);
1933 }
1934
1935 if (runtime_visible_parameter_annotations_length +
1936 runtime_invisible_parameter_annotations_length > 0) {
1937 a = assemble_annotations(runtime_visible_parameter_annotations,
1938 runtime_visible_parameter_annotations_length,
1939 runtime_invisible_parameter_annotations,
1940 runtime_invisible_parameter_annotations_length,
1941 CHECK);
1942 cm->set_parameter_annotations(a);
1943 }
1944
1945 if (annotation_default_length > 0) {
1946 a = assemble_annotations(annotation_default,
1947 annotation_default_length,
1948 NULL,
1949 0,
1950 CHECK);
1951 cm->set_default_annotations(a);
1952 }
1953
1954 if (runtime_visible_type_annotations_length +
1955 runtime_invisible_type_annotations_length > 0) {
1956 a = assemble_annotations(runtime_visible_type_annotations,
1957 runtime_visible_type_annotations_length,
1958 runtime_invisible_type_annotations,
1959 runtime_invisible_type_annotations_length,
1960 CHECK);
1961 cm->set_type_annotations(a);
1962 }
1963 }
1964
1965
1966 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1967 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1968 // Method* to save footprint, so we only know the size of the resulting Method* when the
1969 // entire method attribute is parsed.
1970 //
1971 // The promoted_flags parameter is used to pass relevant access_flags
1972 // from the method back up to the containing klass. These flag values
1973 // are added to klass's access_flags.
1974
1975 methodHandle ClassFileParser::parse_method(bool is_interface,
1976 AccessFlags *promoted_flags,
1977 TRAPS) {
1978 ClassFileStream* cfs = stream();
1979 methodHandle nullHandle;
1980 ResourceMark rm(THREAD);
1981 // Parse fixed parts
1982 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1983
1984 int flags = cfs->get_u2_fast();
1985 u2 name_index = cfs->get_u2_fast();
1986 int cp_size = _cp->length();
1987 check_property(
1988 valid_symbol_at(name_index),
1989 "Illegal constant pool index %u for method name in class file %s",
1990 name_index, CHECK_(nullHandle));
1991 Symbol* name = _cp->symbol_at(name_index);
1992 verify_legal_method_name(name, CHECK_(nullHandle));
1993
1994 u2 signature_index = cfs->get_u2_fast();
1995 guarantee_property(
1996 valid_symbol_at(signature_index),
1997 "Illegal constant pool index %u for method signature in class file %s",
1998 signature_index, CHECK_(nullHandle));
1999 Symbol* signature = _cp->symbol_at(signature_index);
2000
2001 AccessFlags access_flags;
2002 if (name == vmSymbols::class_initializer_name()) {
2003 // We ignore the other access flags for a valid class initializer.
2004 // (JVM Spec 2nd ed., chapter 4.6)
2005 if (_major_version < 51) { // backward compatibility
2006 flags = JVM_ACC_STATIC;
2007 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2008 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2009 }
2010 } else {
2011 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2012 }
2013
2014 int args_size = -1; // only used when _need_verify is true
2015 if (_need_verify) {
2016 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2017 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2018 if (args_size > MAX_ARGS_SIZE) {
2019 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2020 }
2021 }
2022
2023 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2024
2025 // Default values for code and exceptions attribute elements
2026 u2 max_stack = 0;
2027 u2 max_locals = 0;
2028 u4 code_length = 0;
2029 u1* code_start = 0;
2030 u2 exception_table_length = 0;
2031 u2* exception_table_start = NULL;
2032 Array<int>* exception_handlers = Universe::the_empty_int_array();
2033 u2 checked_exceptions_length = 0;
2034 u2* checked_exceptions_start = NULL;
2035 CompressedLineNumberWriteStream* linenumber_table = NULL;
2036 int linenumber_table_length = 0;
2037 int total_lvt_length = 0;
2038 u2 lvt_cnt = 0;
2039 u2 lvtt_cnt = 0;
2040 bool lvt_allocated = false;
2041 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2042 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2043 u2* localvariable_table_length;
2044 u2** localvariable_table_start;
2045 u2* localvariable_type_table_length;
2046 u2** localvariable_type_table_start;
2047 u2 method_parameters_length = 0;
2048 u1* method_parameters_data = NULL;
2049 bool method_parameters_seen = false;
2050 bool parsed_code_attribute = false;
2051 bool parsed_checked_exceptions_attribute = false;
2052 bool parsed_stackmap_attribute = false;
2053 // stackmap attribute - JDK1.5
2054 u1* stackmap_data = NULL;
2055 int stackmap_data_length = 0;
2056 u2 generic_signature_index = 0;
2057 MethodAnnotationCollector parsed_annotations;
2058 u1* runtime_visible_annotations = NULL;
2059 int runtime_visible_annotations_length = 0;
2060 u1* runtime_invisible_annotations = NULL;
2061 int runtime_invisible_annotations_length = 0;
2062 u1* runtime_visible_parameter_annotations = NULL;
2063 int runtime_visible_parameter_annotations_length = 0;
2064 u1* runtime_invisible_parameter_annotations = NULL;
2065 int runtime_invisible_parameter_annotations_length = 0;
2066 u1* runtime_visible_type_annotations = NULL;
2067 int runtime_visible_type_annotations_length = 0;
2068 u1* runtime_invisible_type_annotations = NULL;
2069 int runtime_invisible_type_annotations_length = 0;
2070 u1* annotation_default = NULL;
2071 int annotation_default_length = 0;
2072
2073 // Parse code and exceptions attribute
2074 u2 method_attributes_count = cfs->get_u2_fast();
2075 while (method_attributes_count--) {
2076 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2077 u2 method_attribute_name_index = cfs->get_u2_fast();
2078 u4 method_attribute_length = cfs->get_u4_fast();
2079 check_property(
2080 valid_symbol_at(method_attribute_name_index),
2081 "Invalid method attribute name index %u in class file %s",
2082 method_attribute_name_index, CHECK_(nullHandle));
2083
2084 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2085 if (method_attribute_name == vmSymbols::tag_code()) {
2086 // Parse Code attribute
2087 if (_need_verify) {
2088 guarantee_property(
2089 !access_flags.is_native() && !access_flags.is_abstract(),
2090 "Code attribute in native or abstract methods in class file %s",
2091 CHECK_(nullHandle));
2092 }
2093 if (parsed_code_attribute) {
2094 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2095 }
2096 parsed_code_attribute = true;
2097
2098 // Stack size, locals size, and code size
2099 if (_major_version == 45 && _minor_version <= 2) {
2100 cfs->guarantee_more(4, CHECK_(nullHandle));
2101 max_stack = cfs->get_u1_fast();
2102 max_locals = cfs->get_u1_fast();
2103 code_length = cfs->get_u2_fast();
2104 } else {
2105 cfs->guarantee_more(8, CHECK_(nullHandle));
2106 max_stack = cfs->get_u2_fast();
2107 max_locals = cfs->get_u2_fast();
2108 code_length = cfs->get_u4_fast();
2109 }
2110 if (_need_verify) {
2111 guarantee_property(args_size <= max_locals,
2112 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2113 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2114 "Invalid method Code length %u in class file %s",
2115 code_length, CHECK_(nullHandle));
2116 }
2117 // Code pointer
2118 code_start = cfs->get_u1_buffer();
2119 assert(code_start != NULL, "null code start");
2120 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2121 cfs->skip_u1_fast(code_length);
2122
2123 // Exception handler table
2124 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2125 exception_table_length = cfs->get_u2_fast();
2126 if (exception_table_length > 0) {
2127 exception_table_start =
2128 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2129 }
2130
2131 // Parse additional attributes in code attribute
2132 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2133 u2 code_attributes_count = cfs->get_u2_fast();
2134
2135 unsigned int calculated_attribute_length = 0;
2136
2137 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2138 calculated_attribute_length =
2139 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2140 } else {
2141 // max_stack, locals and length are smaller in pre-version 45.2 classes
2142 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2143 }
2144 calculated_attribute_length +=
2145 code_length +
2146 sizeof(exception_table_length) +
2147 sizeof(code_attributes_count) +
2148 exception_table_length *
2149 ( sizeof(u2) + // start_pc
2150 sizeof(u2) + // end_pc
2151 sizeof(u2) + // handler_pc
2152 sizeof(u2) ); // catch_type_index
2153
2154 while (code_attributes_count--) {
2155 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2156 u2 code_attribute_name_index = cfs->get_u2_fast();
2157 u4 code_attribute_length = cfs->get_u4_fast();
2158 calculated_attribute_length += code_attribute_length +
2159 sizeof(code_attribute_name_index) +
2160 sizeof(code_attribute_length);
2161 check_property(valid_symbol_at(code_attribute_name_index),
2162 "Invalid code attribute name index %u in class file %s",
2163 code_attribute_name_index,
2164 CHECK_(nullHandle));
2165 if (LoadLineNumberTables &&
2166 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2167 // Parse and compress line number table
2168 parse_linenumber_table(code_attribute_length, code_length,
2169 &linenumber_table, CHECK_(nullHandle));
2170
2171 } else if (LoadLocalVariableTables &&
2172 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2173 // Parse local variable table
2174 if (!lvt_allocated) {
2175 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2176 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2177 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2178 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2179 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2180 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2181 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2182 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2183 lvt_allocated = true;
2184 }
2185 if (lvt_cnt == max_lvt_cnt) {
2186 max_lvt_cnt <<= 1;
2187 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2188 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2189 }
2190 localvariable_table_start[lvt_cnt] =
2191 parse_localvariable_table(code_length,
2192 max_locals,
2193 code_attribute_length,
2194 &localvariable_table_length[lvt_cnt],
2195 false, // is not LVTT
2196 CHECK_(nullHandle));
2197 total_lvt_length += localvariable_table_length[lvt_cnt];
2198 lvt_cnt++;
2199 } else if (LoadLocalVariableTypeTables &&
2200 _major_version >= JAVA_1_5_VERSION &&
2201 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2202 if (!lvt_allocated) {
2203 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2204 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2205 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2206 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2207 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2208 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2209 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2210 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2211 lvt_allocated = true;
2212 }
2213 // Parse local variable type table
2214 if (lvtt_cnt == max_lvtt_cnt) {
2215 max_lvtt_cnt <<= 1;
2216 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2217 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2218 }
2219 localvariable_type_table_start[lvtt_cnt] =
2220 parse_localvariable_table(code_length,
2221 max_locals,
2222 code_attribute_length,
2223 &localvariable_type_table_length[lvtt_cnt],
2224 true, // is LVTT
2225 CHECK_(nullHandle));
2226 lvtt_cnt++;
2227 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2228 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2229 // Stack map is only needed by the new verifier in JDK1.5.
2230 if (parsed_stackmap_attribute) {
2231 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2232 }
2233 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2234 stackmap_data_length = code_attribute_length;
2235 parsed_stackmap_attribute = true;
2236 } else {
2237 // Skip unknown attributes
2238 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2239 }
2240 }
2241 // check method attribute length
2242 if (_need_verify) {
2243 guarantee_property(method_attribute_length == calculated_attribute_length,
2244 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2245 }
2246 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2247 // Parse Exceptions attribute
2248 if (parsed_checked_exceptions_attribute) {
2249 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2250 }
2251 parsed_checked_exceptions_attribute = true;
2252 checked_exceptions_start =
2253 parse_checked_exceptions(&checked_exceptions_length,
2254 method_attribute_length,
2255 CHECK_(nullHandle));
2256 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2257 // reject multiple method parameters
2258 if (method_parameters_seen) {
2259 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2260 }
2261 method_parameters_seen = true;
2262 method_parameters_length = cfs->get_u1_fast();
2263 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2264 classfile_parse_error(
2265 "Invalid MethodParameters method attribute length %u in class file",
2266 method_attribute_length, CHECK_(nullHandle));
2267 }
2268 method_parameters_data = cfs->get_u1_buffer();
2269 cfs->skip_u2_fast(method_parameters_length);
2270 cfs->skip_u2_fast(method_parameters_length);
2271 // ignore this attribute if it cannot be reflected
2272 if (!SystemDictionary::Parameter_klass_loaded())
2273 method_parameters_length = 0;
2274 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2275 if (method_attribute_length != 0) {
2276 classfile_parse_error(
2277 "Invalid Synthetic method attribute length %u in class file %s",
2278 method_attribute_length, CHECK_(nullHandle));
2279 }
2280 // Should we check that there hasn't already been a synthetic attribute?
2281 access_flags.set_is_synthetic();
2282 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2283 if (method_attribute_length != 0) {
2284 classfile_parse_error(
2285 "Invalid Deprecated method attribute length %u in class file %s",
2286 method_attribute_length, CHECK_(nullHandle));
2287 }
2288 } else if (_major_version >= JAVA_1_5_VERSION) {
2289 if (method_attribute_name == vmSymbols::tag_signature()) {
2290 if (method_attribute_length != 2) {
2291 classfile_parse_error(
2292 "Invalid Signature attribute length %u in class file %s",
2293 method_attribute_length, CHECK_(nullHandle));
2294 }
2295 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2296 generic_signature_index = cfs->get_u2_fast();
2297 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2298 runtime_visible_annotations_length = method_attribute_length;
2299 runtime_visible_annotations = cfs->get_u1_buffer();
2300 assert(runtime_visible_annotations != NULL, "null visible annotations");
2301 parse_annotations(runtime_visible_annotations,
2302 runtime_visible_annotations_length, &parsed_annotations,
2303 CHECK_(nullHandle));
2304 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2305 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2306 runtime_invisible_annotations_length = method_attribute_length;
2307 runtime_invisible_annotations = cfs->get_u1_buffer();
2308 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2309 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2310 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2311 runtime_visible_parameter_annotations_length = method_attribute_length;
2312 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2313 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2314 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2315 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2316 runtime_invisible_parameter_annotations_length = method_attribute_length;
2317 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2318 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2319 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2320 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2321 annotation_default_length = method_attribute_length;
2322 annotation_default = cfs->get_u1_buffer();
2323 assert(annotation_default != NULL, "null annotation default");
2324 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2325 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2326 runtime_visible_type_annotations_length = method_attribute_length;
2327 runtime_visible_type_annotations = cfs->get_u1_buffer();
2328 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2329 // No need for the VM to parse Type annotations
2330 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2331 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2332 runtime_invisible_type_annotations_length = method_attribute_length;
2333 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2334 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2335 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2336 } else {
2337 // Skip unknown attributes
2338 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2339 }
2340 } else {
2341 // Skip unknown attributes
2342 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2343 }
2344 }
2345
2346 if (linenumber_table != NULL) {
2347 linenumber_table->write_terminator();
2348 linenumber_table_length = linenumber_table->position();
2349 }
2350
2351 // Make sure there's at least one Code attribute in non-native/non-abstract method
2352 if (_need_verify) {
2353 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2354 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2355 }
2356
2357 // All sizing information for a Method* is finally available, now create it
2358 InlineTableSizes sizes(
2359 total_lvt_length,
2360 linenumber_table_length,
2361 exception_table_length,
2362 checked_exceptions_length,
2363 method_parameters_length,
2364 generic_signature_index,
2365 runtime_visible_annotations_length +
2366 runtime_invisible_annotations_length,
2367 runtime_visible_parameter_annotations_length +
2368 runtime_invisible_parameter_annotations_length,
2369 runtime_visible_type_annotations_length +
2370 runtime_invisible_type_annotations_length,
2371 annotation_default_length,
2372 0);
2373
2374 Method* m = Method::allocate(
2375 _loader_data, code_length, access_flags, &sizes,
2376 ConstMethod::NORMAL, CHECK_(nullHandle));
2377
2378 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2379
2380 // Fill in information from fixed part (access_flags already set)
2381 m->set_constants(_cp);
2382 m->set_name_index(name_index);
2383 m->set_signature_index(signature_index);
2384 #ifdef CC_INTERP
2385 // hmm is there a gc issue here??
2386 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2387 m->set_result_index(rtf.type());
2388 #endif
2389
2390 if (args_size >= 0) {
2391 m->set_size_of_parameters(args_size);
2392 } else {
2393 m->compute_size_of_parameters(THREAD);
2394 }
2395 #ifdef ASSERT
2396 if (args_size >= 0) {
2397 m->compute_size_of_parameters(THREAD);
2398 assert(args_size == m->size_of_parameters(), "");
2399 }
2400 #endif
2401
2402 // Fill in code attribute information
2403 m->set_max_stack(max_stack);
2404 m->set_max_locals(max_locals);
2405 if (stackmap_data != NULL) {
2406 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2407 stackmap_data_length, CHECK_NULL);
2408 }
2409
2410 // Copy byte codes
2411 m->set_code(code_start);
2412
2413 // Copy line number table
2414 if (linenumber_table != NULL) {
2415 memcpy(m->compressed_linenumber_table(),
2416 linenumber_table->buffer(), linenumber_table_length);
2417 }
2418
2419 // Copy exception table
2420 if (exception_table_length > 0) {
2421 int size =
2422 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2423 copy_u2_with_conversion((u2*) m->exception_table_start(),
2424 exception_table_start, size);
2425 }
2426
2427 // Copy method parameters
2428 if (method_parameters_length > 0) {
2429 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2430 for (int i = 0; i < method_parameters_length; i++) {
2431 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2432 method_parameters_data += 2;
2433 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2434 method_parameters_data += 2;
2435 }
2436 }
2437
2438 // Copy checked exceptions
2439 if (checked_exceptions_length > 0) {
2440 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2441 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2442 }
2443
2444 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2445 if (total_lvt_length > 0) {
2446 promoted_flags->set_has_localvariable_table();
2447 copy_localvariable_table(m->constMethod(), lvt_cnt,
2448 localvariable_table_length,
2449 localvariable_table_start,
2450 lvtt_cnt,
2451 localvariable_type_table_length,
2452 localvariable_type_table_start, CHECK_NULL);
2453 }
2454
2455 if (parsed_annotations.has_any_annotations())
2456 parsed_annotations.apply_to(m);
2457
2458 // Copy annotations
2459 copy_method_annotations(m->constMethod(),
2460 runtime_visible_annotations,
2461 runtime_visible_annotations_length,
2462 runtime_invisible_annotations,
2463 runtime_invisible_annotations_length,
2464 runtime_visible_parameter_annotations,
2465 runtime_visible_parameter_annotations_length,
2466 runtime_invisible_parameter_annotations,
2467 runtime_invisible_parameter_annotations_length,
2468 runtime_visible_type_annotations,
2469 runtime_visible_type_annotations_length,
2470 runtime_invisible_type_annotations,
2471 runtime_invisible_type_annotations_length,
2472 annotation_default,
2473 annotation_default_length,
2474 CHECK_NULL);
2475
2476 if (name == vmSymbols::finalize_method_name() &&
2477 signature == vmSymbols::void_method_signature()) {
2478 if (m->is_empty_method()) {
2479 _has_empty_finalizer = true;
2480 } else {
2481 _has_finalizer = true;
2482 }
2483 }
2484 if (name == vmSymbols::object_initializer_name() &&
2485 signature == vmSymbols::void_method_signature() &&
2486 m->is_vanilla_constructor()) {
2487 _has_vanilla_constructor = true;
2488 }
2489
2490 NOT_PRODUCT(m->verify());
2491 return m;
2492 }
2493
2494
2495 // The promoted_flags parameter is used to pass relevant access_flags
2496 // from the methods back up to the containing klass. These flag values
2497 // are added to klass's access_flags.
2498
2499 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2500 AccessFlags* promoted_flags,
2501 bool* has_final_method,
2502 bool* has_default_methods,
2503 TRAPS) {
2504 ClassFileStream* cfs = stream();
2505 cfs->guarantee_more(2, CHECK_NULL); // length
2506 u2 length = cfs->get_u2_fast();
2507 if (length == 0) {
2508 _methods = Universe::the_empty_method_array();
2509 } else {
2510 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2511
2512 HandleMark hm(THREAD);
2513 for (int index = 0; index < length; index++) {
2514 methodHandle method = parse_method(is_interface,
2515 promoted_flags,
2516 CHECK_NULL);
2517
2518 if (method->is_final()) {
2519 *has_final_method = true;
2520 }
2521 if (is_interface && !method->is_abstract() && !method->is_static()) {
2522 // default method
2523 *has_default_methods = true;
2524 }
2525 _methods->at_put(index, method());
2526 }
2527
2528 if (_need_verify && length > 1) {
2529 // Check duplicated methods
2530 ResourceMark rm(THREAD);
2531 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2532 THREAD, NameSigHash*, HASH_ROW_SIZE);
2533 initialize_hashtable(names_and_sigs);
2534 bool dup = false;
2535 {
2536 debug_only(No_Safepoint_Verifier nsv;)
2537 for (int i = 0; i < length; i++) {
2538 Method* m = _methods->at(i);
2539 // If no duplicates, add name/signature in hashtable names_and_sigs.
2540 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2541 dup = true;
2542 break;
2543 }
2544 }
2545 }
2546 if (dup) {
2547 classfile_parse_error("Duplicate method name&signature in class file %s",
2548 CHECK_NULL);
2549 }
2550 }
2551 }
2552 return _methods;
2553 }
2554
2555
2556 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2557 int length = methods->length();
2558 // If JVMTI original method ordering or sharing is enabled we have to
2559 // remember the original class file ordering.
2560 // We temporarily use the vtable_index field in the Method* to store the
2561 // class file index, so we can read in after calling qsort.
2562 // Put the method ordering in the shared archive.
2563 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2564 for (int index = 0; index < length; index++) {
2565 Method* m = methods->at(index);
2566 assert(!m->valid_vtable_index(), "vtable index should not be set");
2567 m->set_vtable_index(index);
2568 }
2569 }
2570 // Sort method array by ascending method name (for faster lookups & vtable construction)
2571 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2572 Method::sort_methods(methods);
2573
2574 intArray* method_ordering = NULL;
2575 // If JVMTI original method ordering or sharing is enabled construct int
2576 // array remembering the original ordering
2577 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2578 method_ordering = new intArray(length);
2579 for (int index = 0; index < length; index++) {
2580 Method* m = methods->at(index);
2581 int old_index = m->vtable_index();
2582 assert(old_index >= 0 && old_index < length, "invalid method index");
2583 method_ordering->at_put(index, old_index);
2584 m->set_vtable_index(Method::invalid_vtable_index);
2585 }
2586 }
2587 return method_ordering;
2588 }
2589
2590
2591 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2592 ClassFileStream* cfs = stream();
2593 cfs->guarantee_more(2, CHECK); // sourcefile_index
2594 u2 sourcefile_index = cfs->get_u2_fast();
2595 check_property(
2596 valid_symbol_at(sourcefile_index),
2597 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2598 sourcefile_index, CHECK);
2599 set_class_sourcefile_index(sourcefile_index);
2600 }
2601
2602
2603
2604 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2605 ClassFileStream* cfs = stream();
2606 u1* sde_buffer = cfs->get_u1_buffer();
2607 assert(sde_buffer != NULL, "null sde buffer");
2608
2609 // Don't bother storing it if there is no way to retrieve it
2610 if (JvmtiExport::can_get_source_debug_extension()) {
2611 assert((length+1) > length, "Overflow checking");
2612 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2613 for (int i = 0; i < length; i++) {
2614 sde[i] = sde_buffer[i];
2615 }
2616 sde[length] = '\0';
2617 set_class_sde_buffer((char*)sde, length);
2618 }
2619 // Got utf8 string, set stream position forward
2620 cfs->skip_u1(length, CHECK);
2621 }
2622
2623
2624 // Inner classes can be static, private or protected (classic VM does this)
2625 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2626
2627 // Return number of classes in the inner classes attribute table
2628 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2629 bool parsed_enclosingmethod_attribute,
2630 u2 enclosing_method_class_index,
2631 u2 enclosing_method_method_index,
2632 TRAPS) {
2633 ClassFileStream* cfs = stream();
2634 u1* current_mark = cfs->current();
2635 u2 length = 0;
2636 if (inner_classes_attribute_start != NULL) {
2637 cfs->set_current(inner_classes_attribute_start);
2638 cfs->guarantee_more(2, CHECK_0); // length
2639 length = cfs->get_u2_fast();
2640 }
2641
2642 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2643 // method data:
2644 // [inner_class_info_index,
2645 // outer_class_info_index,
2646 // inner_name_index,
2647 // inner_class_access_flags,
2648 // ...
2649 // enclosing_method_class_index,
2650 // enclosing_method_method_index]
2651 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2652 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2653 _inner_classes = inner_classes;
2654
2655 int index = 0;
2656 int cp_size = _cp->length();
2657 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2658 for (int n = 0; n < length; n++) {
2659 // Inner class index
2660 u2 inner_class_info_index = cfs->get_u2_fast();
2661 check_property(
2662 inner_class_info_index == 0 ||
2663 valid_klass_reference_at(inner_class_info_index),
2664 "inner_class_info_index %u has bad constant type in class file %s",
2665 inner_class_info_index, CHECK_0);
2666 // Outer class index
2667 u2 outer_class_info_index = cfs->get_u2_fast();
2668 check_property(
2669 outer_class_info_index == 0 ||
2670 valid_klass_reference_at(outer_class_info_index),
2671 "outer_class_info_index %u has bad constant type in class file %s",
2672 outer_class_info_index, CHECK_0);
2673 // Inner class name
2674 u2 inner_name_index = cfs->get_u2_fast();
2675 check_property(
2676 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2677 "inner_name_index %u has bad constant type in class file %s",
2678 inner_name_index, CHECK_0);
2679 if (_need_verify) {
2680 guarantee_property(inner_class_info_index != outer_class_info_index,
2681 "Class is both outer and inner class in class file %s", CHECK_0);
2682 }
2683 // Access flags
2684 AccessFlags inner_access_flags;
2685 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2686 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2687 // Set abstract bit for old class files for backward compatibility
2688 flags |= JVM_ACC_ABSTRACT;
2689 }
2690 verify_legal_class_modifiers(flags, CHECK_0);
2691 inner_access_flags.set_flags(flags);
2692
2693 inner_classes->at_put(index++, inner_class_info_index);
2694 inner_classes->at_put(index++, outer_class_info_index);
2695 inner_classes->at_put(index++, inner_name_index);
2696 inner_classes->at_put(index++, inner_access_flags.as_short());
2697 }
2698
2699 // 4347400: make sure there's no duplicate entry in the classes array
2700 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2701 for(int i = 0; i < length * 4; i += 4) {
2702 for(int j = i + 4; j < length * 4; j += 4) {
2703 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2704 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2705 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2706 inner_classes->at(i+3) != inner_classes->at(j+3)),
2707 "Duplicate entry in InnerClasses in class file %s",
2708 CHECK_0);
2709 }
2710 }
2711 }
2712
2713 // Set EnclosingMethod class and method indexes.
2714 if (parsed_enclosingmethod_attribute) {
2715 inner_classes->at_put(index++, enclosing_method_class_index);
2716 inner_classes->at_put(index++, enclosing_method_method_index);
2717 }
2718 assert(index == size, "wrong size");
2719
2720 // Restore buffer's current position.
2721 cfs->set_current(current_mark);
2722
2723 return length;
2724 }
2725
2726 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2727 set_class_synthetic_flag(true);
2728 }
2729
2730 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2731 ClassFileStream* cfs = stream();
2732 u2 signature_index = cfs->get_u2(CHECK);
2733 check_property(
2734 valid_symbol_at(signature_index),
2735 "Invalid constant pool index %u in Signature attribute in class file %s",
2736 signature_index, CHECK);
2737 set_class_generic_signature_index(signature_index);
2738 }
2739
2740 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2741 ClassFileStream* cfs = stream();
2742 u1* current_start = cfs->current();
2743
2744 cfs->guarantee_more(2, CHECK); // length
2745 int attribute_array_length = cfs->get_u2_fast();
2746
2747 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2748 "Short length on BootstrapMethods in class file %s",
2749 CHECK);
2750
2751 // The attribute contains a counted array of counted tuples of shorts,
2752 // represending bootstrap specifiers:
2753 // length*{bootstrap_method_index, argument_count*{argument_index}}
2754 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2755 // operand_count = number of shorts in attr, except for leading length
2756
2757 // The attribute is copied into a short[] array.
2758 // The array begins with a series of short[2] pairs, one for each tuple.
2759 int index_size = (attribute_array_length * 2);
2760
2761 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2762
2763 // Eagerly assign operands so they will be deallocated with the constant
2764 // pool if there is an error.
2765 _cp->set_operands(operands);
2766
2767 int operand_fill_index = index_size;
2768 int cp_size = _cp->length();
2769
2770 for (int n = 0; n < attribute_array_length; n++) {
2771 // Store a 32-bit offset into the header of the operand array.
2772 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2773
2774 // Read a bootstrap specifier.
2775 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2776 u2 bootstrap_method_index = cfs->get_u2_fast();
2777 u2 argument_count = cfs->get_u2_fast();
2778 check_property(
2779 valid_cp_range(bootstrap_method_index, cp_size) &&
2780 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2781 "bootstrap_method_index %u has bad constant type in class file %s",
2782 bootstrap_method_index,
2783 CHECK);
2784 operands->at_put(operand_fill_index++, bootstrap_method_index);
2785 operands->at_put(operand_fill_index++, argument_count);
2786
2787 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2788 for (int j = 0; j < argument_count; j++) {
2789 u2 argument_index = cfs->get_u2_fast();
2790 check_property(
2791 valid_cp_range(argument_index, cp_size) &&
2792 _cp->tag_at(argument_index).is_loadable_constant(),
2793 "argument_index %u has bad constant type in class file %s",
2794 argument_index,
2795 CHECK);
2796 operands->at_put(operand_fill_index++, argument_index);
2797 }
2798 }
2799
2800 assert(operand_fill_index == operands->length(), "exact fill");
2801 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2802
2803 u1* current_end = cfs->current();
2804 guarantee_property(current_end == current_start + attribute_byte_length,
2805 "Bad length on BootstrapMethods in class file %s",
2806 CHECK);
2807 }
2808
2809 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2810 TRAPS) {
2811 ClassFileStream* cfs = stream();
2812 // Set inner classes attribute to default sentinel
2813 _inner_classes = Universe::the_empty_short_array();
2814 cfs->guarantee_more(2, CHECK); // attributes_count
2815 u2 attributes_count = cfs->get_u2_fast();
2816 bool parsed_sourcefile_attribute = false;
2817 bool parsed_innerclasses_attribute = false;
2818 bool parsed_enclosingmethod_attribute = false;
2819 bool parsed_bootstrap_methods_attribute = false;
2820 u1* runtime_visible_annotations = NULL;
2821 int runtime_visible_annotations_length = 0;
2822 u1* runtime_invisible_annotations = NULL;
2823 int runtime_invisible_annotations_length = 0;
2824 u1* runtime_visible_type_annotations = NULL;
2825 int runtime_visible_type_annotations_length = 0;
2826 u1* runtime_invisible_type_annotations = NULL;
2827 int runtime_invisible_type_annotations_length = 0;
2828 u1* inner_classes_attribute_start = NULL;
2829 u4 inner_classes_attribute_length = 0;
2830 u2 enclosing_method_class_index = 0;
2831 u2 enclosing_method_method_index = 0;
2832 // Iterate over attributes
2833 while (attributes_count--) {
2834 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2835 u2 attribute_name_index = cfs->get_u2_fast();
2836 u4 attribute_length = cfs->get_u4_fast();
2837 check_property(
2838 valid_symbol_at(attribute_name_index),
2839 "Attribute name has bad constant pool index %u in class file %s",
2840 attribute_name_index, CHECK);
2841 Symbol* tag = _cp->symbol_at(attribute_name_index);
2842 if (tag == vmSymbols::tag_source_file()) {
2843 // Check for SourceFile tag
2844 if (_need_verify) {
2845 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2846 }
2847 if (parsed_sourcefile_attribute) {
2848 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2849 } else {
2850 parsed_sourcefile_attribute = true;
2851 }
2852 parse_classfile_sourcefile_attribute(CHECK);
2853 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2854 // Check for SourceDebugExtension tag
2855 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2856 } else if (tag == vmSymbols::tag_inner_classes()) {
2857 // Check for InnerClasses tag
2858 if (parsed_innerclasses_attribute) {
2859 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2860 } else {
2861 parsed_innerclasses_attribute = true;
2862 }
2863 inner_classes_attribute_start = cfs->get_u1_buffer();
2864 inner_classes_attribute_length = attribute_length;
2865 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2866 } else if (tag == vmSymbols::tag_synthetic()) {
2867 // Check for Synthetic tag
2868 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2869 if (attribute_length != 0) {
2870 classfile_parse_error(
2871 "Invalid Synthetic classfile attribute length %u in class file %s",
2872 attribute_length, CHECK);
2873 }
2874 parse_classfile_synthetic_attribute(CHECK);
2875 } else if (tag == vmSymbols::tag_deprecated()) {
2876 // Check for Deprecatd tag - 4276120
2877 if (attribute_length != 0) {
2878 classfile_parse_error(
2879 "Invalid Deprecated classfile attribute length %u in class file %s",
2880 attribute_length, CHECK);
2881 }
2882 } else if (_major_version >= JAVA_1_5_VERSION) {
2883 if (tag == vmSymbols::tag_signature()) {
2884 if (attribute_length != 2) {
2885 classfile_parse_error(
2886 "Wrong Signature attribute length %u in class file %s",
2887 attribute_length, CHECK);
2888 }
2889 parse_classfile_signature_attribute(CHECK);
2890 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2891 runtime_visible_annotations_length = attribute_length;
2892 runtime_visible_annotations = cfs->get_u1_buffer();
2893 assert(runtime_visible_annotations != NULL, "null visible annotations");
2894 parse_annotations(runtime_visible_annotations,
2895 runtime_visible_annotations_length,
2896 parsed_annotations,
2897 CHECK);
2898 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2899 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2900 runtime_invisible_annotations_length = attribute_length;
2901 runtime_invisible_annotations = cfs->get_u1_buffer();
2902 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2903 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2904 } else if (tag == vmSymbols::tag_enclosing_method()) {
2905 if (parsed_enclosingmethod_attribute) {
2906 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2907 } else {
2908 parsed_enclosingmethod_attribute = true;
2909 }
2910 cfs->guarantee_more(4, CHECK); // class_index, method_index
2911 enclosing_method_class_index = cfs->get_u2_fast();
2912 enclosing_method_method_index = cfs->get_u2_fast();
2913 if (enclosing_method_class_index == 0) {
2914 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2915 }
2916 // Validate the constant pool indices and types
2917 check_property(valid_klass_reference_at(enclosing_method_class_index),
2918 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2919 if (enclosing_method_method_index != 0 &&
2920 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2921 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2922 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2923 }
2924 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2925 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2926 if (parsed_bootstrap_methods_attribute)
2927 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2928 parsed_bootstrap_methods_attribute = true;
2929 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2930 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2931 runtime_visible_type_annotations_length = attribute_length;
2932 runtime_visible_type_annotations = cfs->get_u1_buffer();
2933 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2934 // No need for the VM to parse Type annotations
2935 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2936 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2937 runtime_invisible_type_annotations_length = attribute_length;
2938 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2939 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2940 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2941 } else {
2942 // Unknown attribute
2943 cfs->skip_u1(attribute_length, CHECK);
2944 }
2945 } else {
2946 // Unknown attribute
2947 cfs->skip_u1(attribute_length, CHECK);
2948 }
2949 }
2950 _annotations = assemble_annotations(runtime_visible_annotations,
2951 runtime_visible_annotations_length,
2952 runtime_invisible_annotations,
2953 runtime_invisible_annotations_length,
2954 CHECK);
2955 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
2956 runtime_visible_type_annotations_length,
2957 runtime_invisible_type_annotations,
2958 runtime_invisible_type_annotations_length,
2959 CHECK);
2960
2961 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2962 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2963 inner_classes_attribute_start,
2964 parsed_innerclasses_attribute,
2965 enclosing_method_class_index,
2966 enclosing_method_method_index,
2967 CHECK);
2968 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2969 guarantee_property(
2970 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2971 "Wrong InnerClasses attribute length in class file %s", CHECK);
2972 }
2973 }
2974
2975 if (_max_bootstrap_specifier_index >= 0) {
2976 guarantee_property(parsed_bootstrap_methods_attribute,
2977 "Missing BootstrapMethods attribute in class file %s", CHECK);
2978 }
2979 }
2980
2981 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2982 if (_synthetic_flag)
2983 k->set_is_synthetic();
2984 if (_sourcefile_index != 0) {
2985 k->set_source_file_name_index(_sourcefile_index);
2986 }
2987 if (_generic_signature_index != 0) {
2988 k->set_generic_signature_index(_generic_signature_index);
2989 }
2990 if (_sde_buffer != NULL) {
2991 k->set_source_debug_extension(_sde_buffer, _sde_length);
2992 }
2993 }
2994
2995 // Transfer ownership of metadata allocated to the InstanceKlass.
2996 void ClassFileParser::apply_parsed_class_metadata(
2997 instanceKlassHandle this_klass,
2998 int java_fields_count, TRAPS) {
2999 // Assign annotations if needed
3000 if (_annotations != NULL || _type_annotations != NULL ||
3001 _fields_annotations != NULL || _fields_type_annotations != NULL) {
3002 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3003 annotations->set_class_annotations(_annotations);
3004 annotations->set_class_type_annotations(_type_annotations);
3005 annotations->set_fields_annotations(_fields_annotations);
3006 annotations->set_fields_type_annotations(_fields_type_annotations);
3007 this_klass->set_annotations(annotations);
3008 }
3009
3010 _cp->set_pool_holder(this_klass());
3011 this_klass->set_constants(_cp);
3012 this_klass->set_fields(_fields, java_fields_count);
3013 this_klass->set_methods(_methods);
3014 this_klass->set_inner_classes(_inner_classes);
3015 this_klass->set_local_interfaces(_local_interfaces);
3016 this_klass->set_transitive_interfaces(_transitive_interfaces);
3017
3018 // Clear out these fields so they don't get deallocated by the destructor
3019 clear_class_metadata();
3020 }
3021
3022 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3023 int runtime_visible_annotations_length,
3024 u1* runtime_invisible_annotations,
3025 int runtime_invisible_annotations_length, TRAPS) {
3026 AnnotationArray* annotations = NULL;
3027 if (runtime_visible_annotations != NULL ||
3028 runtime_invisible_annotations != NULL) {
3029 annotations = MetadataFactory::new_array<u1>(_loader_data,
3030 runtime_visible_annotations_length +
3031 runtime_invisible_annotations_length,
3032 CHECK_(annotations));
3033 if (runtime_visible_annotations != NULL) {
3034 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3035 annotations->at_put(i, runtime_visible_annotations[i]);
3036 }
3037 }
3038 if (runtime_invisible_annotations != NULL) {
3039 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3040 int append = runtime_visible_annotations_length+i;
3041 annotations->at_put(append, runtime_invisible_annotations[i]);
3042 }
3043 }
3044 }
3045 return annotations;
3046 }
3047
3048
3049 #ifdef ASSERT
3050 static void parseAndPrintGenericSignatures(
3051 instanceKlassHandle this_klass, TRAPS) {
3052 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3053 ResourceMark rm;
3054
3055 if (this_klass->generic_signature() != NULL) {
3056 using namespace generic;
3057 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3058
3059 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3060 spec->print_on(tty);
3061
3062 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3063 Method* m = this_klass->methods()->at(i);
3064 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3065 Symbol* sig = m->generic_signature();
3066 if (sig == NULL) {
3067 sig = m->signature();
3068 }
3069 tty->print_cr("Parsing %s", sig->as_C_string());
3070 method_spec->print_on(tty);
3071 }
3072 }
3073 }
3074 #endif // def ASSERT
3075
3076
3077 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3078 TRAPS) {
3079 instanceKlassHandle super_klass;
3080 if (super_class_index == 0) {
3081 check_property(_class_name == vmSymbols::java_lang_Object(),
3082 "Invalid superclass index %u in class file %s",
3083 super_class_index,
3084 CHECK_NULL);
3085 } else {
3086 check_property(valid_klass_reference_at(super_class_index),
3087 "Invalid superclass index %u in class file %s",
3088 super_class_index,
3089 CHECK_NULL);
3090 // The class name should be legal because it is checked when parsing constant pool.
3091 // However, make sure it is not an array type.
3092 bool is_array = false;
3093 if (_cp->tag_at(super_class_index).is_klass()) {
3094 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3095 if (_need_verify)
3096 is_array = super_klass->oop_is_array();
3097 } else if (_need_verify) {
3098 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3099 }
3100 if (_need_verify) {
3101 guarantee_property(!is_array,
3102 "Bad superclass name in class file %s", CHECK_NULL);
3103 }
3104 }
3105 return super_klass;
3106 }
3107
3108
3109 // Values needed for oopmap and InstanceKlass creation
3110 class FieldLayoutInfo : public StackObj {
3111 public:
3112 int* nonstatic_oop_offsets;
3113 unsigned int* nonstatic_oop_counts;
3114 unsigned int nonstatic_oop_map_count;
3115 unsigned int total_oop_map_count;
3116 int instance_size;
3117 int nonstatic_field_size;
3118 int static_field_size;
3119 bool has_nonstatic_fields;
3120 };
3121
3122 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3123 void ClassFileParser::layout_fields(Handle class_loader,
3124 FieldAllocationCount* fac,
3125 ClassAnnotationCollector* parsed_annotations,
3126 FieldLayoutInfo* info,
3127 TRAPS) {
3128
3129 // Field size and offset computation
3130 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3131 int next_static_oop_offset;
3132 int next_static_double_offset;
3133 int next_static_word_offset;
3134 int next_static_short_offset;
3135 int next_static_byte_offset;
3136 int next_nonstatic_oop_offset;
3137 int next_nonstatic_double_offset;
3138 int next_nonstatic_word_offset;
3139 int next_nonstatic_short_offset;
3140 int next_nonstatic_byte_offset;
3141 int first_nonstatic_oop_offset;
3142 int next_nonstatic_field_offset;
3143 int next_nonstatic_padded_offset;
3144
3145 // Count the contended fields by type.
3146 //
3147 // We ignore static fields, because @Contended is not supported for them.
3148 // The layout code below will also ignore the static fields.
3149 int nonstatic_contended_count = 0;
3150 FieldAllocationCount fac_contended;
3151 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3152 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3153 if (fs.is_contended()) {
3154 fac_contended.count[atype]++;
3155 if (!fs.access_flags().is_static()) {
3156 nonstatic_contended_count++;
3157 }
3158 }
3159 }
3160
3161
3162 // Calculate the starting byte offsets
3163 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3164 next_static_double_offset = next_static_oop_offset +
3165 ((fac->count[STATIC_OOP]) * heapOopSize);
3166 if ( fac->count[STATIC_DOUBLE] &&
3167 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3168 Universe::field_type_should_be_aligned(T_LONG)) ) {
3169 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3170 }
3171
3172 next_static_word_offset = next_static_double_offset +
3173 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3174 next_static_short_offset = next_static_word_offset +
3175 ((fac->count[STATIC_WORD]) * BytesPerInt);
3176 next_static_byte_offset = next_static_short_offset +
3177 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3178
3179 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3180 nonstatic_field_size * heapOopSize;
3181
3182 next_nonstatic_field_offset = nonstatic_fields_start;
3183
3184 bool is_contended_class = parsed_annotations->is_contended();
3185
3186 // Class is contended, pad before all the fields
3187 if (is_contended_class) {
3188 next_nonstatic_field_offset += ContendedPaddingWidth;
3189 }
3190
3191 // Compute the non-contended fields count.
3192 // The packing code below relies on these counts to determine if some field
3193 // can be squeezed into the alignment gap. Contended fields are obviously
3194 // exempt from that.
3195 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3196 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3197 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3198 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3199 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3200
3201 // Total non-static fields count, including every contended field
3202 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3203 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3204 fac->count[NONSTATIC_OOP];
3205
3206 bool super_has_nonstatic_fields =
3207 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3208 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3209
3210
3211 // Prepare list of oops for oop map generation.
3212 //
3213 // "offset" and "count" lists are describing the set of contiguous oop
3214 // regions. offset[i] is the start of the i-th region, which then has
3215 // count[i] oops following. Before we know how many regions are required,
3216 // we pessimistically allocate the maps to fit all the oops into the
3217 // distinct regions.
3218 //
3219 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3220 // to figure out if we still need to do this.
3221 int* nonstatic_oop_offsets;
3222 unsigned int* nonstatic_oop_counts;
3223 unsigned int nonstatic_oop_map_count = 0;
3224 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3225
3226 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3227 THREAD, int, max_nonstatic_oop_maps);
3228 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3229 THREAD, unsigned int, max_nonstatic_oop_maps);
3230
3231 first_nonstatic_oop_offset = 0; // will be set for first oop field
3232
3233 bool compact_fields = CompactFields;
3234 int allocation_style = FieldsAllocationStyle;
3235 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3236 assert(false, "0 <= FieldsAllocationStyle <= 2");
3237 allocation_style = 1; // Optimistic
3238 }
3239
3240 // The next classes have predefined hard-coded fields offsets
3241 // (see in JavaClasses::compute_hard_coded_offsets()).
3242 // Use default fields allocation order for them.
3243 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3244 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3245 _class_name == vmSymbols::java_lang_Class() ||
3246 _class_name == vmSymbols::java_lang_ClassLoader() ||
3247 _class_name == vmSymbols::java_lang_ref_Reference() ||
3248 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3249 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3250 _class_name == vmSymbols::java_lang_String() ||
3251 _class_name == vmSymbols::java_lang_Throwable() ||
3252 _class_name == vmSymbols::java_lang_Boolean() ||
3253 _class_name == vmSymbols::java_lang_Character() ||
3254 _class_name == vmSymbols::java_lang_Float() ||
3255 _class_name == vmSymbols::java_lang_Double() ||
3256 _class_name == vmSymbols::java_lang_Byte() ||
3257 _class_name == vmSymbols::java_lang_Short() ||
3258 _class_name == vmSymbols::java_lang_Integer() ||
3259 _class_name == vmSymbols::java_lang_Long())) {
3260 allocation_style = 0; // Allocate oops first
3261 compact_fields = false; // Don't compact fields
3262 }
3263
3264 // Rearrange fields for a given allocation style
3265 if( allocation_style == 0 ) {
3266 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3267 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3268 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3269 (nonstatic_oop_count * heapOopSize);
3270 } else if( allocation_style == 1 ) {
3271 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3272 next_nonstatic_double_offset = next_nonstatic_field_offset;
3273 } else if( allocation_style == 2 ) {
3274 // Fields allocation: oops fields in super and sub classes are together.
3275 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3276 _super_klass->nonstatic_oop_map_size() > 0 ) {
3277 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3278 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3279 OopMapBlock* last_map = first_map + map_count - 1;
3280 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3281 if (next_offset == next_nonstatic_field_offset) {
3282 allocation_style = 0; // allocate oops first
3283 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3284 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3285 (nonstatic_oop_count * heapOopSize);
3286 }
3287 }
3288 if( allocation_style == 2 ) {
3289 allocation_style = 1; // allocate oops last
3290 next_nonstatic_double_offset = next_nonstatic_field_offset;
3291 }
3292 } else {
3293 ShouldNotReachHere();
3294 }
3295
3296 int nonstatic_oop_space_count = 0;
3297 int nonstatic_word_space_count = 0;
3298 int nonstatic_short_space_count = 0;
3299 int nonstatic_byte_space_count = 0;
3300 int nonstatic_oop_space_offset;
3301 int nonstatic_word_space_offset;
3302 int nonstatic_short_space_offset;
3303 int nonstatic_byte_space_offset;
3304
3305 // Try to squeeze some of the fields into the gaps due to
3306 // long/double alignment.
3307 if( nonstatic_double_count > 0 ) {
3308 int offset = next_nonstatic_double_offset;
3309 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3310 if( compact_fields && offset != next_nonstatic_double_offset ) {
3311 // Allocate available fields into the gap before double field.
3312 int length = next_nonstatic_double_offset - offset;
3313 assert(length == BytesPerInt, "");
3314 nonstatic_word_space_offset = offset;
3315 if( nonstatic_word_count > 0 ) {
3316 nonstatic_word_count -= 1;
3317 nonstatic_word_space_count = 1; // Only one will fit
3318 length -= BytesPerInt;
3319 offset += BytesPerInt;
3320 }
3321 nonstatic_short_space_offset = offset;
3322 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3323 nonstatic_short_count -= 1;
3324 nonstatic_short_space_count += 1;
3325 length -= BytesPerShort;
3326 offset += BytesPerShort;
3327 }
3328 nonstatic_byte_space_offset = offset;
3329 while( length > 0 && nonstatic_byte_count > 0 ) {
3330 nonstatic_byte_count -= 1;
3331 nonstatic_byte_space_count += 1;
3332 length -= 1;
3333 }
3334 // Allocate oop field in the gap if there are no other fields for that.
3335 nonstatic_oop_space_offset = offset;
3336 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3337 allocation_style != 0 ) { // when oop fields not first
3338 nonstatic_oop_count -= 1;
3339 nonstatic_oop_space_count = 1; // Only one will fit
3340 length -= heapOopSize;
3341 offset += heapOopSize;
3342 }
3343 }
3344 }
3345
3346 next_nonstatic_word_offset = next_nonstatic_double_offset +
3347 (nonstatic_double_count * BytesPerLong);
3348 next_nonstatic_short_offset = next_nonstatic_word_offset +
3349 (nonstatic_word_count * BytesPerInt);
3350 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3351 (nonstatic_short_count * BytesPerShort);
3352 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3353 nonstatic_byte_count;
3354
3355 // let oops jump before padding with this allocation style
3356 if( allocation_style == 1 ) {
3357 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3358 if( nonstatic_oop_count > 0 ) {
3359 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3360 }
3361 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3362 }
3363
3364 // Iterate over fields again and compute correct offsets.
3365 // The field allocation type was temporarily stored in the offset slot.
3366 // oop fields are located before non-oop fields (static and non-static).
3367 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3368
3369 // skip already laid out fields
3370 if (fs.is_offset_set()) continue;
3371
3372 // contended instance fields are handled below
3373 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3374
3375 int real_offset;
3376 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3377
3378 // pack the rest of the fields
3379 switch (atype) {
3380 case STATIC_OOP:
3381 real_offset = next_static_oop_offset;
3382 next_static_oop_offset += heapOopSize;
3383 break;
3384 case STATIC_BYTE:
3385 real_offset = next_static_byte_offset;
3386 next_static_byte_offset += 1;
3387 break;
3388 case STATIC_SHORT:
3389 real_offset = next_static_short_offset;
3390 next_static_short_offset += BytesPerShort;
3391 break;
3392 case STATIC_WORD:
3393 real_offset = next_static_word_offset;
3394 next_static_word_offset += BytesPerInt;
3395 break;
3396 case STATIC_DOUBLE:
3397 real_offset = next_static_double_offset;
3398 next_static_double_offset += BytesPerLong;
3399 break;
3400 case NONSTATIC_OOP:
3401 if( nonstatic_oop_space_count > 0 ) {
3402 real_offset = nonstatic_oop_space_offset;
3403 nonstatic_oop_space_offset += heapOopSize;
3404 nonstatic_oop_space_count -= 1;
3405 } else {
3406 real_offset = next_nonstatic_oop_offset;
3407 next_nonstatic_oop_offset += heapOopSize;
3408 }
3409 // Update oop maps
3410 if( nonstatic_oop_map_count > 0 &&
3411 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3412 real_offset -
3413 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3414 heapOopSize ) {
3415 // Extend current oop map
3416 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3417 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3418 } else {
3419 // Create new oop map
3420 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3421 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3422 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3423 nonstatic_oop_map_count += 1;
3424 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3425 first_nonstatic_oop_offset = real_offset;
3426 }
3427 }
3428 break;
3429 case NONSTATIC_BYTE:
3430 if( nonstatic_byte_space_count > 0 ) {
3431 real_offset = nonstatic_byte_space_offset;
3432 nonstatic_byte_space_offset += 1;
3433 nonstatic_byte_space_count -= 1;
3434 } else {
3435 real_offset = next_nonstatic_byte_offset;
3436 next_nonstatic_byte_offset += 1;
3437 }
3438 break;
3439 case NONSTATIC_SHORT:
3440 if( nonstatic_short_space_count > 0 ) {
3441 real_offset = nonstatic_short_space_offset;
3442 nonstatic_short_space_offset += BytesPerShort;
3443 nonstatic_short_space_count -= 1;
3444 } else {
3445 real_offset = next_nonstatic_short_offset;
3446 next_nonstatic_short_offset += BytesPerShort;
3447 }
3448 break;
3449 case NONSTATIC_WORD:
3450 if( nonstatic_word_space_count > 0 ) {
3451 real_offset = nonstatic_word_space_offset;
3452 nonstatic_word_space_offset += BytesPerInt;
3453 nonstatic_word_space_count -= 1;
3454 } else {
3455 real_offset = next_nonstatic_word_offset;
3456 next_nonstatic_word_offset += BytesPerInt;
3457 }
3458 break;
3459 case NONSTATIC_DOUBLE:
3460 real_offset = next_nonstatic_double_offset;
3461 next_nonstatic_double_offset += BytesPerLong;
3462 break;
3463 default:
3464 ShouldNotReachHere();
3465 }
3466 fs.set_offset(real_offset);
3467 }
3468
3469
3470 // Handle the contended cases.
3471 //
3472 // Each contended field should not intersect the cache line with another contended field.
3473 // In the absence of alignment information, we end up with pessimistically separating
3474 // the fields with full-width padding.
3475 //
3476 // Additionally, this should not break alignment for the fields, so we round the alignment up
3477 // for each field.
3478 if (nonstatic_contended_count > 0) {
3479
3480 // if there is at least one contended field, we need to have pre-padding for them
3481 next_nonstatic_padded_offset += ContendedPaddingWidth;
3482
3483 // collect all contended groups
3484 BitMap bm(_cp->size());
3485 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3486 // skip already laid out fields
3487 if (fs.is_offset_set()) continue;
3488
3489 if (fs.is_contended()) {
3490 bm.set_bit(fs.contended_group());
3491 }
3492 }
3493
3494 int current_group = -1;
3495 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3496
3497 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3498
3499 // skip already laid out fields
3500 if (fs.is_offset_set()) continue;
3501
3502 // skip non-contended fields and fields from different group
3503 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3504
3505 // handle statics below
3506 if (fs.access_flags().is_static()) continue;
3507
3508 int real_offset;
3509 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3510
3511 switch (atype) {
3512 case NONSTATIC_BYTE:
3513 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3514 real_offset = next_nonstatic_padded_offset;
3515 next_nonstatic_padded_offset += 1;
3516 break;
3517
3518 case NONSTATIC_SHORT:
3519 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3520 real_offset = next_nonstatic_padded_offset;
3521 next_nonstatic_padded_offset += BytesPerShort;
3522 break;
3523
3524 case NONSTATIC_WORD:
3525 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3526 real_offset = next_nonstatic_padded_offset;
3527 next_nonstatic_padded_offset += BytesPerInt;
3528 break;
3529
3530 case NONSTATIC_DOUBLE:
3531 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3532 real_offset = next_nonstatic_padded_offset;
3533 next_nonstatic_padded_offset += BytesPerLong;
3534 break;
3535
3536 case NONSTATIC_OOP:
3537 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3538 real_offset = next_nonstatic_padded_offset;
3539 next_nonstatic_padded_offset += heapOopSize;
3540
3541 // Create new oop map
3542 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3543 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3544 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3545 nonstatic_oop_map_count += 1;
3546 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3547 first_nonstatic_oop_offset = real_offset;
3548 }
3549 break;
3550
3551 default:
3552 ShouldNotReachHere();
3553 }
3554
3555 if (fs.contended_group() == 0) {
3556 // Contended group defines the equivalence class over the fields:
3557 // the fields within the same contended group are not inter-padded.
3558 // The only exception is default group, which does not incur the
3559 // equivalence, and so requires intra-padding.
3560 next_nonstatic_padded_offset += ContendedPaddingWidth;
3561 }
3562
3563 fs.set_offset(real_offset);
3564 } // for
3565
3566 // Start laying out the next group.
3567 // Note that this will effectively pad the last group in the back;
3568 // this is expected to alleviate memory contention effects for
3569 // subclass fields and/or adjacent object.
3570 // If this was the default group, the padding is already in place.
3571 if (current_group != 0) {
3572 next_nonstatic_padded_offset += ContendedPaddingWidth;
3573 }
3574 }
3575
3576 // handle static fields
3577 }
3578
3579 // Entire class is contended, pad in the back.
3580 // This helps to alleviate memory contention effects for subclass fields
3581 // and/or adjacent object.
3582 if (is_contended_class) {
3583 next_nonstatic_padded_offset += ContendedPaddingWidth;
3584 }
3585
3586 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3587
3588 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3589 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3590 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3591
3592 int static_field_size = (static_fields_end -
3593 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3594 nonstatic_field_size = nonstatic_field_size +
3595 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3596
3597 int instance_size = align_object_size(instance_end / wordSize);
3598
3599 assert(instance_size == align_object_size(align_size_up(
3600 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3601 wordSize) / wordSize), "consistent layout helper value");
3602
3603 // Invariant: nonstatic_field end/start should only change if there are
3604 // nonstatic fields in the class, or if the class is contended. We compare
3605 // against the non-aligned value, so that end alignment will not fail the
3606 // assert without actually having the fields.
3607 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3608 is_contended_class ||
3609 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3610
3611 // Number of non-static oop map blocks allocated at end of klass.
3612 const unsigned int total_oop_map_count =
3613 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3614 first_nonstatic_oop_offset);
3615
3616 #ifndef PRODUCT
3617 if (PrintFieldLayout) {
3618 print_field_layout(_class_name,
3619 _fields,
3620 _cp,
3621 instance_size,
3622 nonstatic_fields_start,
3623 nonstatic_fields_end,
3624 static_fields_end);
3625 }
3626
3627 #endif
3628 // Pass back information needed for InstanceKlass creation
3629 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3630 info->nonstatic_oop_counts = nonstatic_oop_counts;
3631 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3632 info->total_oop_map_count = total_oop_map_count;
3633 info->instance_size = instance_size;
3634 info->static_field_size = static_field_size;
3635 info->nonstatic_field_size = nonstatic_field_size;
3636 info->has_nonstatic_fields = has_nonstatic_fields;
3637 }
3638
3639
3640 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3641 ClassLoaderData* loader_data,
3642 Handle protection_domain,
3643 KlassHandle host_klass,
3644 GrowableArray<Handle>* cp_patches,
3645 TempNewSymbol& parsed_name,
3646 bool verify,
3647 TRAPS) {
3648
3649 // When a retransformable agent is attached, JVMTI caches the
3650 // class bytes that existed before the first retransformation.
3651 // If RedefineClasses() was used before the retransformable
3652 // agent attached, then the cached class bytes may not be the
3653 // original class bytes.
3654 JvmtiCachedClassFileData *cached_class_file = NULL;
3655 Handle class_loader(THREAD, loader_data->class_loader());
3656 bool has_default_methods = false;
3657 ResourceMark rm(THREAD);
3658
3659 ClassFileStream* cfs = stream();
3660 // Timing
3661 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3662 JavaThread* jt = (JavaThread*) THREAD;
3663
3664 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3665 ClassLoader::perf_class_parse_selftime(),
3666 NULL,
3667 jt->get_thread_stat()->perf_recursion_counts_addr(),
3668 jt->get_thread_stat()->perf_timers_addr(),
3669 PerfClassTraceTime::PARSE_CLASS);
3670
3671 init_parsed_class_attributes(loader_data);
3672
3673 if (JvmtiExport::should_post_class_file_load_hook()) {
3674 // Get the cached class file bytes (if any) from the class that
3675 // is being redefined or retransformed. We use jvmti_thread_state()
3676 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3677 // a JvmtiThreadState any earlier than necessary. This will help
3678 // avoid the bug described by 7126851.
3679 JvmtiThreadState *state = jt->jvmti_thread_state();
3680 if (state != NULL) {
3681 KlassHandle *h_class_being_redefined =
3682 state->get_class_being_redefined();
3683 if (h_class_being_redefined != NULL) {
3684 instanceKlassHandle ikh_class_being_redefined =
3685 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3686 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3687 }
3688 }
3689
3690 unsigned char* ptr = cfs->buffer();
3691 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3692
3693 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3694 &ptr, &end_ptr, &cached_class_file);
3695
3696 if (ptr != cfs->buffer()) {
3697 // JVMTI agent has modified class file data.
3698 // Set new class file stream using JVMTI agent modified
3699 // class file data.
3700 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3701 set_stream(cfs);
3702 }
3703 }
3704
3705 _host_klass = host_klass;
3706 _cp_patches = cp_patches;
3707
3708 instanceKlassHandle nullHandle;
3709
3710 // Figure out whether we can skip format checking (matching classic VM behavior)
3711 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3712
3713 // Set the verify flag in stream
3714 cfs->set_verify(_need_verify);
3715
3716 // Save the class file name for easier error message printing.
3717 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3718
3719 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3720 // Magic value
3721 u4 magic = cfs->get_u4_fast();
3722 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3723 "Incompatible magic value %u in class file %s",
3724 magic, CHECK_(nullHandle));
3725
3726 // Version numbers
3727 u2 minor_version = cfs->get_u2_fast();
3728 u2 major_version = cfs->get_u2_fast();
3729
3730 // Check version numbers - we check this even with verifier off
3731 if (!is_supported_version(major_version, minor_version)) {
3732 if (name == NULL) {
3733 Exceptions::fthrow(
3734 THREAD_AND_LOCATION,
3735 vmSymbols::java_lang_UnsupportedClassVersionError(),
3736 "Unsupported major.minor version %u.%u",
3737 major_version,
3738 minor_version);
3739 } else {
3740 ResourceMark rm(THREAD);
3741 Exceptions::fthrow(
3742 THREAD_AND_LOCATION,
3743 vmSymbols::java_lang_UnsupportedClassVersionError(),
3744 "%s : Unsupported major.minor version %u.%u",
3745 name->as_C_string(),
3746 major_version,
3747 minor_version);
3748 }
3749 return nullHandle;
3750 }
3751
3752 _major_version = major_version;
3753 _minor_version = minor_version;
3754
3755
3756 // Check if verification needs to be relaxed for this class file
3757 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3758 _relax_verify = Verifier::relax_verify_for(class_loader());
3759
3760 // Constant pool
3761 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3762
3763 int cp_size = cp->length();
3764
3765 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3766
3767 // Access flags
3768 AccessFlags access_flags;
3769 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3770
3771 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3772 // Set abstract bit for old class files for backward compatibility
3773 flags |= JVM_ACC_ABSTRACT;
3774 }
3775 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3776 access_flags.set_flags(flags);
3777
3778 // This class and superclass
3779 u2 this_class_index = cfs->get_u2_fast();
3780 check_property(
3781 valid_cp_range(this_class_index, cp_size) &&
3782 cp->tag_at(this_class_index).is_unresolved_klass(),
3783 "Invalid this class index %u in constant pool in class file %s",
3784 this_class_index, CHECK_(nullHandle));
3785
3786 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3787 assert(class_name != NULL, "class_name can't be null");
3788
3789 // It's important to set parsed_name *before* resolving the super class.
3790 // (it's used for cleanup by the caller if parsing fails)
3791 parsed_name = class_name;
3792 // parsed_name is returned and can be used if there's an error, so add to
3793 // its reference count. Caller will decrement the refcount.
3794 parsed_name->increment_refcount();
3795
3796 // Update _class_name which could be null previously to be class_name
3797 _class_name = class_name;
3798
3799 // Don't need to check whether this class name is legal or not.
3800 // It has been checked when constant pool is parsed.
3801 // However, make sure it is not an array type.
3802 if (_need_verify) {
3803 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3804 "Bad class name in class file %s",
3805 CHECK_(nullHandle));
3806 }
3807
3808 Klass* preserve_this_klass; // for storing result across HandleMark
3809
3810 // release all handles when parsing is done
3811 { HandleMark hm(THREAD);
3812
3813 // Checks if name in class file matches requested name
3814 if (name != NULL && class_name != name) {
3815 ResourceMark rm(THREAD);
3816 Exceptions::fthrow(
3817 THREAD_AND_LOCATION,
3818 vmSymbols::java_lang_NoClassDefFoundError(),
3819 "%s (wrong name: %s)",
3820 name->as_C_string(),
3821 class_name->as_C_string()
3822 );
3823 return nullHandle;
3824 }
3825
3826 if (TraceClassLoadingPreorder) {
3827 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3828 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3829 tty->print_cr("]");
3830 }
3831
3832 u2 super_class_index = cfs->get_u2_fast();
3833 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3834 CHECK_NULL);
3835
3836 // Interfaces
3837 u2 itfs_len = cfs->get_u2_fast();
3838 Array<Klass*>* local_interfaces =
3839 parse_interfaces(itfs_len, protection_domain, _class_name,
3840 &has_default_methods, CHECK_(nullHandle));
3841
3842 u2 java_fields_count = 0;
3843 // Fields (offsets are filled in later)
3844 FieldAllocationCount fac;
3845 Array<u2>* fields = parse_fields(class_name,
3846 access_flags.is_interface(),
3847 &fac, &java_fields_count,
3848 CHECK_(nullHandle));
3849 // Methods
3850 bool has_final_method = false;
3851 AccessFlags promoted_flags;
3852 promoted_flags.set_flags(0);
3853 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3854 &promoted_flags,
3855 &has_final_method,
3856 &has_default_methods,
3857 CHECK_(nullHandle));
3858
3859 // Additional attributes
3860 ClassAnnotationCollector parsed_annotations;
3861 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3862
3863 // Make sure this is the end of class file stream
3864 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3865
3866 // We check super class after class file is parsed and format is checked
3867 if (super_class_index > 0 && super_klass.is_null()) {
3868 Symbol* sk = cp->klass_name_at(super_class_index);
3869 if (access_flags.is_interface()) {
3870 // Before attempting to resolve the superclass, check for class format
3871 // errors not checked yet.
3872 guarantee_property(sk == vmSymbols::java_lang_Object(),
3873 "Interfaces must have java.lang.Object as superclass in class file %s",
3874 CHECK_(nullHandle));
3875 }
3876 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3877 class_loader,
3878 protection_domain,
3879 true,
3880 CHECK_(nullHandle));
3881
3882 KlassHandle kh (THREAD, k);
3883 super_klass = instanceKlassHandle(THREAD, kh());
3884 }
3885 if (super_klass.not_null()) {
3886
3887 if (super_klass->has_default_methods()) {
3888 has_default_methods = true;
3889 }
3890
3891 if (super_klass->is_interface()) {
3892 ResourceMark rm(THREAD);
3893 Exceptions::fthrow(
3894 THREAD_AND_LOCATION,
3895 vmSymbols::java_lang_IncompatibleClassChangeError(),
3896 "class %s has interface %s as super class",
3897 class_name->as_klass_external_name(),
3898 super_klass->external_name()
3899 );
3900 return nullHandle;
3901 }
3902 // Make sure super class is not final
3903 if (super_klass->is_final()) {
3904 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3905 }
3906 }
3907
3908 // save super klass for error handling.
3909 _super_klass = super_klass;
3910
3911 // Compute the transitive list of all unique interfaces implemented by this class
3912 _transitive_interfaces =
3913 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3914
3915 // sort methods
3916 intArray* method_ordering = sort_methods(methods);
3917
3918 // promote flags from parse_methods() to the klass' flags
3919 access_flags.add_promoted_flags(promoted_flags.as_int());
3920
3921 // Size of Java vtable (in words)
3922 int vtable_size = 0;
3923 int itable_size = 0;
3924 int num_miranda_methods = 0;
3925
3926 GrowableArray<Method*> all_mirandas(20);
3927
3928 klassVtable::compute_vtable_size_and_num_mirandas(
3929 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3930 access_flags, class_loader, class_name, local_interfaces,
3931 CHECK_(nullHandle));
3932
3933 // Size of Java itable (in words)
3934 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
3935
3936 FieldLayoutInfo info;
3937 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
3938
3939 int total_oop_map_size2 =
3940 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
3941
3942 // Compute reference type
3943 ReferenceType rt;
3944 if (super_klass() == NULL) {
3945 rt = REF_NONE;
3946 } else {
3947 rt = super_klass->reference_type();
3948 }
3949
3950 // We can now create the basic Klass* for this klass
3951 _klass = InstanceKlass::allocate_instance_klass(loader_data,
3952 vtable_size,
3953 itable_size,
3954 info.static_field_size,
3955 total_oop_map_size2,
3956 rt,
3957 access_flags,
3958 name,
3959 super_klass(),
3960 !host_klass.is_null(),
3961 CHECK_(nullHandle));
3962 instanceKlassHandle this_klass (THREAD, _klass);
3963
3964 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
3965 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
3966 "sanity");
3967
3968 // Fill in information already parsed
3969 this_klass->set_should_verify_class(verify);
3970 jint lh = Klass::instance_layout_helper(info.instance_size, false);
3971 this_klass->set_layout_helper(lh);
3972 assert(this_klass->oop_is_instance(), "layout is correct");
3973 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
3974 // Not yet: supers are done below to support the new subtype-checking fields
3975 //this_klass->set_super(super_klass());
3976 this_klass->set_class_loader_data(loader_data);
3977 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
3978 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
3979 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3980
3981 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
3982
3983 if (has_final_method) {
3984 this_klass->set_has_final_method();
3985 }
3986 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
3987 // The InstanceKlass::_methods_jmethod_ids cache and the
3988 // InstanceKlass::_methods_cached_itable_indices cache are
3989 // both managed on the assumption that the initial cache
3990 // size is equal to the number of methods in the class. If
3991 // that changes, then InstanceKlass::idnum_can_increment()
3992 // has to be changed accordingly.
3993 this_klass->set_initial_method_idnum(methods->length());
3994 this_klass->set_name(cp->klass_name_at(this_class_index));
3995 if (is_anonymous()) // I am well known to myself
3996 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3997
3998 this_klass->set_minor_version(minor_version);
3999 this_klass->set_major_version(major_version);
4000 this_klass->set_has_default_methods(has_default_methods);
4001
4002 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4003 // (We used to do this lazily, but now we query it in Rewriter,
4004 // which is eagerly done for every method, so we might as well do it now,
4005 // when everything is fresh in memory.)
4006 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4007 for (int j = 0; j < methods->length(); j++) {
4008 methods->at(j)->init_intrinsic_id();
4009 }
4010 }
4011
4012 if (cached_class_file != NULL) {
4013 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4014 this_klass->set_cached_class_file(cached_class_file);
4015 }
4016
4017 // Fill in field values obtained by parse_classfile_attributes
4018 if (parsed_annotations.has_any_annotations())
4019 parsed_annotations.apply_to(this_klass);
4020 apply_parsed_class_attributes(this_klass);
4021
4022 // Miranda methods
4023 if ((num_miranda_methods > 0) ||
4024 // if this class introduced new miranda methods or
4025 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4026 // super class exists and this class inherited miranda methods
4027 ) {
4028 this_klass->set_has_miranda_methods(); // then set a flag
4029 }
4030
4031 // Fill in information needed to compute superclasses.
4032 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4033
4034 // Initialize itable offset tables
4035 klassItable::setup_itable_offset_table(this_klass);
4036
4037 // Compute transitive closure of interfaces this class implements
4038 // Do final class setup
4039 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4040
4041 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4042 set_precomputed_flags(this_klass);
4043
4044 // reinitialize modifiers, using the InnerClasses attribute
4045 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4046 this_klass->set_modifier_flags(computed_modifiers);
4047
4048 // check if this class can access its super class
4049 check_super_class_access(this_klass, CHECK_(nullHandle));
4050
4051 // check if this class can access its superinterfaces
4052 check_super_interface_access(this_klass, CHECK_(nullHandle));
4053
4054 // check if this class overrides any final method
4055 check_final_method_override(this_klass, CHECK_(nullHandle));
4056
4057 // check that if this class is an interface then it doesn't have static methods
4058 if (this_klass->is_interface()) {
4059 /* An interface in a JAVA 8 classfile can be static */
4060 if (_major_version < JAVA_8_VERSION) {
4061 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4062 }
4063 }
4064
4065 // Allocate mirror and initialize static fields
4066 java_lang_Class::create_mirror(this_klass, protection_domain, CHECK_(nullHandle));
4067
4068
4069 #ifdef ASSERT
4070 if (ParseAllGenericSignatures) {
4071 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4072 }
4073 #endif
4074
4075 // Generate any default methods - default methods are interface methods
4076 // that have a default implementation. This is new with Lambda project.
4077 if (has_default_methods && !access_flags.is_interface() &&
4078 local_interfaces->length() > 0) {
4079 DefaultMethods::generate_default_methods(
4080 this_klass(), &all_mirandas, CHECK_(nullHandle));
4081 }
4082
4083 // Update the loader_data graph.
4084 record_defined_class_dependencies(this_klass, CHECK_NULL);
4085
4086 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4087 false /* not shared class */);
4088
4089 if (TraceClassLoading) {
4090 ResourceMark rm;
4091 // print in a single call to reduce interleaving of output
4092 if (cfs->source() != NULL) {
4093 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4094 cfs->source());
4095 } else if (class_loader.is_null()) {
4096 if (THREAD->is_Java_thread()) {
4097 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4098 tty->print("[Loaded %s by instance of %s]\n",
4099 this_klass->external_name(),
4100 InstanceKlass::cast(caller)->external_name());
4101 } else {
4102 tty->print("[Loaded %s]\n", this_klass->external_name());
4103 }
4104 } else {
4105 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4106 InstanceKlass::cast(class_loader->klass())->external_name());
4107 }
4108 }
4109
4110 if (TraceClassResolution) {
4111 ResourceMark rm;
4112 // print out the superclass.
4113 const char * from = this_klass()->external_name();
4114 if (this_klass->java_super() != NULL) {
4115 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4116 }
4117 // print out each of the interface classes referred to by this class.
4118 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4119 if (local_interfaces != NULL) {
4120 int length = local_interfaces->length();
4121 for (int i = 0; i < length; i++) {
4122 Klass* k = local_interfaces->at(i);
4123 InstanceKlass* to_class = InstanceKlass::cast(k);
4124 const char * to = to_class->external_name();
4125 tty->print("RESOLVE %s %s (interface)\n", from, to);
4126 }
4127 }
4128 }
4129
4130 // preserve result across HandleMark
4131 preserve_this_klass = this_klass();
4132 }
4133
4134 // Create new handle outside HandleMark (might be needed for
4135 // Extended Class Redefinition)
4136 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4137 debug_only(this_klass->verify();)
4138
4139 // Clear class if no error has occurred so destructor doesn't deallocate it
4140 _klass = NULL;
4141 return this_klass;
4142 }
4143
4144 // Destructor to clean up if there's an error
4145 ClassFileParser::~ClassFileParser() {
4146 MetadataFactory::free_metadata(_loader_data, _cp);
4147 MetadataFactory::free_array<u2>(_loader_data, _fields);
4148
4149 // Free methods
4150 InstanceKlass::deallocate_methods(_loader_data, _methods);
4151
4152 // beware of the Universe::empty_blah_array!!
4153 if (_inner_classes != Universe::the_empty_short_array()) {
4154 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4155 }
4156
4157 // Free interfaces
4158 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4159 _local_interfaces, _transitive_interfaces);
4160
4161 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4162 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4163 Annotations::free_contents(_loader_data, _fields_annotations);
4164 Annotations::free_contents(_loader_data, _fields_type_annotations);
4165
4166 clear_class_metadata();
4167
4168 // deallocate the klass if already created.
4169 MetadataFactory::free_metadata(_loader_data, _klass);
4170 _klass = NULL;
4171 }
4172
4173 void ClassFileParser::print_field_layout(Symbol* name,
4174 Array<u2>* fields,
4175 constantPoolHandle cp,
4176 int instance_size,
4177 int instance_fields_start,
4178 int instance_fields_end,
4179 int static_fields_end) {
4180 tty->print("%s: field layout\n", name->as_klass_external_name());
4181 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4182 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4183 if (!fs.access_flags().is_static()) {
4184 tty->print(" @%3d \"%s\" %s\n",
4185 fs.offset(),
4186 fs.name()->as_klass_external_name(),
4187 fs.signature()->as_klass_external_name());
4188 }
4189 }
4190 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4191 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4192 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4193 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4194 if (fs.access_flags().is_static()) {
4195 tty->print(" @%3d \"%s\" %s\n",
4196 fs.offset(),
4197 fs.name()->as_klass_external_name(),
4198 fs.signature()->as_klass_external_name());
4199 }
4200 }
4201 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4202 tty->print("\n");
4203 }
4204
4205 unsigned int
4206 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4207 unsigned int nonstatic_oop_map_count,
4208 int first_nonstatic_oop_offset) {
4209 unsigned int map_count =
4210 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4211 if (nonstatic_oop_map_count > 0) {
4212 // We have oops to add to map
4213 if (map_count == 0) {
4214 map_count = nonstatic_oop_map_count;
4215 } else {
4216 // Check whether we should add a new map block or whether the last one can
4217 // be extended
4218 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4219 OopMapBlock* const last_map = first_map + map_count - 1;
4220
4221 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4222 if (next_offset == first_nonstatic_oop_offset) {
4223 // There is no gap bettwen superklass's last oop field and first
4224 // local oop field, merge maps.
4225 nonstatic_oop_map_count -= 1;
4226 } else {
4227 // Superklass didn't end with a oop field, add extra maps
4228 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4229 }
4230 map_count += nonstatic_oop_map_count;
4231 }
4232 }
4233 return map_count;
4234 }
4235
4236
4237 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4238 unsigned int nonstatic_oop_map_count,
4239 int* nonstatic_oop_offsets,
4240 unsigned int* nonstatic_oop_counts) {
4241 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4242 const InstanceKlass* const super = k->superklass();
4243 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4244 if (super_count > 0) {
4245 // Copy maps from superklass
4246 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4247 for (unsigned int i = 0; i < super_count; ++i) {
4248 *this_oop_map++ = *super_oop_map++;
4249 }
4250 }
4251
4252 if (nonstatic_oop_map_count > 0) {
4253 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4254 // The counts differ because there is no gap between superklass's last oop
4255 // field and the first local oop field. Extend the last oop map copied
4256 // from the superklass instead of creating new one.
4257 nonstatic_oop_map_count--;
4258 nonstatic_oop_offsets++;
4259 this_oop_map--;
4260 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4261 this_oop_map++;
4262 }
4263
4264 // Add new map blocks, fill them
4265 while (nonstatic_oop_map_count-- > 0) {
4266 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4267 this_oop_map->set_count(*nonstatic_oop_counts++);
4268 this_oop_map++;
4269 }
4270 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4271 this_oop_map, "sanity");
4272 }
4273 }
4274
4275
4276 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4277 Klass* super = k->super();
4278
4279 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4280 // in which case we don't have to register objects as finalizable
4281 if (!_has_empty_finalizer) {
4282 if (_has_finalizer ||
4283 (super != NULL && super->has_finalizer())) {
4284 k->set_has_finalizer();
4285 }
4286 }
4287
4288 #ifdef ASSERT
4289 bool f = false;
4290 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4291 vmSymbols::void_method_signature());
4292 if (m != NULL && !m->is_empty_method()) {
4293 f = true;
4294 }
4295 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4296 #endif
4297
4298 // Check if this klass supports the java.lang.Cloneable interface
4299 if (SystemDictionary::Cloneable_klass_loaded()) {
4300 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4301 k->set_is_cloneable();
4302 }
4303 }
4304
4305 // Check if this klass has a vanilla default constructor
4306 if (super == NULL) {
4307 // java.lang.Object has empty default constructor
4308 k->set_has_vanilla_constructor();
4309 } else {
4310 if (super->has_vanilla_constructor() &&
4311 _has_vanilla_constructor) {
4312 k->set_has_vanilla_constructor();
4313 }
4314 #ifdef ASSERT
4315 bool v = false;
4316 if (super->has_vanilla_constructor()) {
4317 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4318 ), vmSymbols::void_method_signature());
4319 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4320 v = true;
4321 }
4322 }
4323 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4324 #endif
4325 }
4326
4327 // If it cannot be fast-path allocated, set a bit in the layout helper.
4328 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4329 assert(k->size_helper() > 0, "layout_helper is initialized");
4330 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4331 || k->is_abstract() || k->is_interface()
4332 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4333 || k->size_helper() >= FastAllocateSizeLimit) {
4334 // Forbid fast-path allocation.
4335 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4336 k->set_layout_helper(lh);
4337 }
4338 }
4339
4340 // Attach super classes and interface classes to class loader data
4341 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4342 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4343 if (defining_loader_data->is_the_null_class_loader_data()) {
4344 // Dependencies to null class loader data are implicit.
4345 return;
4346 } else {
4347 // add super class dependency
4348 Klass* super = defined_klass->super();
4349 if (super != NULL) {
4350 defining_loader_data->record_dependency(super, CHECK);
4351 }
4352
4353 // add super interface dependencies
4354 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4355 if (local_interfaces != NULL) {
4356 int length = local_interfaces->length();
4357 for (int i = 0; i < length; i++) {
4358 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4359 }
4360 }
4361 }
4362 }
4363
4364 // utility methods for appending an array with check for duplicates
4365
4366 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4367 // iterate over new interfaces
4368 for (int i = 0; i < ifs->length(); i++) {
4369 Klass* e = ifs->at(i);
4370 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4371 // add new interface
4372 result->append_if_missing(e);
4373 }
4374 }
4375
4376 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4377 instanceKlassHandle super,
4378 Array<Klass*>* local_ifs, TRAPS) {
4379 // Compute maximum size for transitive interfaces
4380 int max_transitive_size = 0;
4381 int super_size = 0;
4382 // Add superclass transitive interfaces size
4383 if (super.not_null()) {
4384 super_size = super->transitive_interfaces()->length();
4385 max_transitive_size += super_size;
4386 }
4387 // Add local interfaces' super interfaces
4388 int local_size = local_ifs->length();
4389 for (int i = 0; i < local_size; i++) {
4390 Klass* l = local_ifs->at(i);
4391 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4392 }
4393 // Finally add local interfaces
4394 max_transitive_size += local_size;
4395 // Construct array
4396 if (max_transitive_size == 0) {
4397 // no interfaces, use canonicalized array
4398 return Universe::the_empty_klass_array();
4399 } else if (max_transitive_size == super_size) {
4400 // no new local interfaces added, share superklass' transitive interface array
4401 return super->transitive_interfaces();
4402 } else if (max_transitive_size == local_size) {
4403 // only local interfaces added, share local interface array
4404 return local_ifs;
4405 } else {
4406 ResourceMark rm;
4407 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4408
4409 // Copy down from superclass
4410 if (super.not_null()) {
4411 append_interfaces(result, super->transitive_interfaces());
4412 }
4413
4414 // Copy down from local interfaces' superinterfaces
4415 for (int i = 0; i < local_ifs->length(); i++) {
4416 Klass* l = local_ifs->at(i);
4417 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4418 }
4419 // Finally add local interfaces
4420 append_interfaces(result, local_ifs);
4421
4422 // length will be less than the max_transitive_size if duplicates were removed
4423 int length = result->length();
4424 assert(length <= max_transitive_size, "just checking");
4425 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4426 for (int i = 0; i < length; i++) {
4427 Klass* e = result->at(i);
4428 assert(e != NULL, "just checking");
4429 new_result->at_put(i, e);
4430 }
4431 return new_result;
4432 }
4433 }
4434
4435 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4436 Klass* super = this_klass->super();
4437 if ((super != NULL) &&
4438 (!Reflection::verify_class_access(this_klass(), super, false))) {
4439 ResourceMark rm(THREAD);
4440 Exceptions::fthrow(
4441 THREAD_AND_LOCATION,
4442 vmSymbols::java_lang_IllegalAccessError(),
4443 "class %s cannot access its superclass %s",
4444 this_klass->external_name(),
4445 InstanceKlass::cast(super)->external_name()
4446 );
4447 return;
4448 }
4449 }
4450
4451
4452 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4453 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4454 int lng = local_interfaces->length();
4455 for (int i = lng - 1; i >= 0; i--) {
4456 Klass* k = local_interfaces->at(i);
4457 assert (k != NULL && k->is_interface(), "invalid interface");
4458 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4459 ResourceMark rm(THREAD);
4460 Exceptions::fthrow(
4461 THREAD_AND_LOCATION,
4462 vmSymbols::java_lang_IllegalAccessError(),
4463 "class %s cannot access its superinterface %s",
4464 this_klass->external_name(),
4465 InstanceKlass::cast(k)->external_name()
4466 );
4467 return;
4468 }
4469 }
4470 }
4471
4472
4473 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4474 Array<Method*>* methods = this_klass->methods();
4475 int num_methods = methods->length();
4476
4477 // go thru each method and check if it overrides a final method
4478 for (int index = 0; index < num_methods; index++) {
4479 Method* m = methods->at(index);
4480
4481 // skip private, static and <init> methods
4482 if ((!m->is_private()) &&
4483 (!m->is_static()) &&
4484 (m->name() != vmSymbols::object_initializer_name())) {
4485
4486 Symbol* name = m->name();
4487 Symbol* signature = m->signature();
4488 Klass* k = this_klass->super();
4489 Method* super_m = NULL;
4490 while (k != NULL) {
4491 // skip supers that don't have final methods.
4492 if (k->has_final_method()) {
4493 // lookup a matching method in the super class hierarchy
4494 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4495 if (super_m == NULL) {
4496 break; // didn't find any match; get out
4497 }
4498
4499 if (super_m->is_final() &&
4500 // matching method in super is final
4501 (Reflection::verify_field_access(this_klass(),
4502 super_m->method_holder(),
4503 super_m->method_holder(),
4504 super_m->access_flags(), false))
4505 // this class can access super final method and therefore override
4506 ) {
4507 ResourceMark rm(THREAD);
4508 Exceptions::fthrow(
4509 THREAD_AND_LOCATION,
4510 vmSymbols::java_lang_VerifyError(),
4511 "class %s overrides final method %s.%s",
4512 this_klass->external_name(),
4513 name->as_C_string(),
4514 signature->as_C_string()
4515 );
4516 return;
4517 }
4518
4519 // continue to look from super_m's holder's super.
4520 k = super_m->method_holder()->super();
4521 continue;
4522 }
4523
4524 k = k->super();
4525 }
4526 }
4527 }
4528 }
4529
4530
4531 // assumes that this_klass is an interface
4532 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4533 assert(this_klass->is_interface(), "not an interface");
4534 Array<Method*>* methods = this_klass->methods();
4535 int num_methods = methods->length();
4536
4537 for (int index = 0; index < num_methods; index++) {
4538 Method* m = methods->at(index);
4539 // if m is static and not the init method, throw a verify error
4540 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4541 ResourceMark rm(THREAD);
4542 Exceptions::fthrow(
4543 THREAD_AND_LOCATION,
4544 vmSymbols::java_lang_VerifyError(),
4545 "Illegal static method %s in interface %s",
4546 m->name()->as_C_string(),
4547 this_klass->external_name()
4548 );
4549 return;
4550 }
4551 }
4552 }
4553
4554 // utility methods for format checking
4555
4556 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4557 if (!_need_verify) { return; }
4558
4559 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4560 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4561 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4562 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4563 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4564 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4565 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4566
4567 if ((is_abstract && is_final) ||
4568 (is_interface && !is_abstract) ||
4569 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4570 (!is_interface && major_gte_15 && is_annotation)) {
4571 ResourceMark rm(THREAD);
4572 Exceptions::fthrow(
4573 THREAD_AND_LOCATION,
4574 vmSymbols::java_lang_ClassFormatError(),
4575 "Illegal class modifiers in class %s: 0x%X",
4576 _class_name->as_C_string(), flags
4577 );
4578 return;
4579 }
4580 }
4581
4582 bool ClassFileParser::has_illegal_visibility(jint flags) {
4583 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4584 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4585 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4586
4587 return ((is_public && is_protected) ||
4588 (is_public && is_private) ||
4589 (is_protected && is_private));
4590 }
4591
4592 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4593 u2 max_version =
4594 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4595 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4596 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4597 (major <= max_version) &&
4598 ((major != max_version) ||
4599 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4600 }
4601
4602 void ClassFileParser::verify_legal_field_modifiers(
4603 jint flags, bool is_interface, TRAPS) {
4604 if (!_need_verify) { return; }
4605
4606 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4607 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4608 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4609 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4610 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4611 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4612 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4613 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4614 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4615
4616 bool is_illegal = false;
4617
4618 if (is_interface) {
4619 if (!is_public || !is_static || !is_final || is_private ||
4620 is_protected || is_volatile || is_transient ||
4621 (major_gte_15 && is_enum)) {
4622 is_illegal = true;
4623 }
4624 } else { // not interface
4625 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4626 is_illegal = true;
4627 }
4628 }
4629
4630 if (is_illegal) {
4631 ResourceMark rm(THREAD);
4632 Exceptions::fthrow(
4633 THREAD_AND_LOCATION,
4634 vmSymbols::java_lang_ClassFormatError(),
4635 "Illegal field modifiers in class %s: 0x%X",
4636 _class_name->as_C_string(), flags);
4637 return;
4638 }
4639 }
4640
4641 void ClassFileParser::verify_legal_method_modifiers(
4642 jint flags, bool is_interface, Symbol* name, TRAPS) {
4643 if (!_need_verify) { return; }
4644
4645 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4646 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4647 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4648 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4649 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4650 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4651 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4652 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4653 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4654 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4655 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4656 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4657 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4658
4659 bool is_illegal = false;
4660
4661 if (is_interface) {
4662 if (major_gte_8) {
4663 // Class file version is JAVA_8_VERSION or later Methods of
4664 // interfaces may set any of the flags except ACC_PROTECTED,
4665 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4666 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4667 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4668 (is_native || is_protected || is_final || is_synchronized) ||
4669 // If a specific method of a class or interface has its
4670 // ACC_ABSTRACT flag set, it must not have any of its
4671 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4672 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4673 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4674 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4675 (is_abstract && (is_private || is_static || is_strict))) {
4676 is_illegal = true;
4677 }
4678 } else if (major_gte_15) {
4679 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4680 if (!is_public || is_static || is_final || is_synchronized ||
4681 is_native || !is_abstract || is_strict) {
4682 is_illegal = true;
4683 }
4684 } else {
4685 // Class file version is pre-JAVA_1_5_VERSION
4686 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4687 is_illegal = true;
4688 }
4689 }
4690 } else { // not interface
4691 if (is_initializer) {
4692 if (is_static || is_final || is_synchronized || is_native ||
4693 is_abstract || (major_gte_15 && is_bridge)) {
4694 is_illegal = true;
4695 }
4696 } else { // not initializer
4697 if (is_abstract) {
4698 if ((is_final || is_native || is_private || is_static ||
4699 (major_gte_15 && (is_synchronized || is_strict)))) {
4700 is_illegal = true;
4701 }
4702 }
4703 if (has_illegal_visibility(flags)) {
4704 is_illegal = true;
4705 }
4706 }
4707 }
4708
4709 if (is_illegal) {
4710 ResourceMark rm(THREAD);
4711 Exceptions::fthrow(
4712 THREAD_AND_LOCATION,
4713 vmSymbols::java_lang_ClassFormatError(),
4714 "Method %s in class %s has illegal modifiers: 0x%X",
4715 name->as_C_string(), _class_name->as_C_string(), flags);
4716 return;
4717 }
4718 }
4719
4720 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4721 assert(_need_verify, "only called when _need_verify is true");
4722 int i = 0;
4723 int count = length >> 2;
4724 for (int k=0; k<count; k++) {
4725 unsigned char b0 = buffer[i];
4726 unsigned char b1 = buffer[i+1];
4727 unsigned char b2 = buffer[i+2];
4728 unsigned char b3 = buffer[i+3];
4729 // For an unsigned char v,
4730 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4731 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4732 unsigned char res = b0 | b0 - 1 |
4733 b1 | b1 - 1 |
4734 b2 | b2 - 1 |
4735 b3 | b3 - 1;
4736 if (res >= 128) break;
4737 i += 4;
4738 }
4739 for(; i < length; i++) {
4740 unsigned short c;
4741 // no embedded zeros
4742 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4743 if(buffer[i] < 128) {
4744 continue;
4745 }
4746 if ((i + 5) < length) { // see if it's legal supplementary character
4747 if (UTF8::is_supplementary_character(&buffer[i])) {
4748 c = UTF8::get_supplementary_character(&buffer[i]);
4749 i += 5;
4750 continue;
4751 }
4752 }
4753 switch (buffer[i] >> 4) {
4754 default: break;
4755 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4756 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4757 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4758 c = (buffer[i] & 0x1F) << 6;
4759 i++;
4760 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4761 c += buffer[i] & 0x3F;
4762 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4763 // for classes with major > 47, c must a null or a character in its shortest form
4764 break;
4765 }
4766 }
4767 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4768 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4769 c = (buffer[i] & 0xF) << 12;
4770 i += 2;
4771 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4772 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4773 if (_major_version <= 47 || c >= 0x800) {
4774 // for classes with major > 47, c must be in its shortest form
4775 break;
4776 }
4777 }
4778 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4779 } // end of switch
4780 } // end of for
4781 }
4782
4783 // Checks if name is a legal class name.
4784 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4785 if (!_need_verify || _relax_verify) { return; }
4786
4787 char buf[fixed_buffer_size];
4788 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4789 unsigned int length = name->utf8_length();
4790 bool legal = false;
4791
4792 if (length > 0) {
4793 char* p;
4794 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4795 p = skip_over_field_signature(bytes, false, length, CHECK);
4796 legal = (p != NULL) && ((p - bytes) == (int)length);
4797 } else if (_major_version < JAVA_1_5_VERSION) {
4798 if (bytes[0] != '<') {
4799 p = skip_over_field_name(bytes, true, length);
4800 legal = (p != NULL) && ((p - bytes) == (int)length);
4801 }
4802 } else {
4803 // 4900761: relax the constraints based on JSR202 spec
4804 // Class names may be drawn from the entire Unicode character set.
4805 // Identifiers between '/' must be unqualified names.
4806 // The utf8 string has been verified when parsing cpool entries.
4807 legal = verify_unqualified_name(bytes, length, LegalClass);
4808 }
4809 }
4810 if (!legal) {
4811 ResourceMark rm(THREAD);
4812 Exceptions::fthrow(
4813 THREAD_AND_LOCATION,
4814 vmSymbols::java_lang_ClassFormatError(),
4815 "Illegal class name \"%s\" in class file %s", bytes,
4816 _class_name->as_C_string()
4817 );
4818 return;
4819 }
4820 }
4821
4822 // Checks if name is a legal field name.
4823 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4824 if (!_need_verify || _relax_verify) { return; }
4825
4826 char buf[fixed_buffer_size];
4827 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4828 unsigned int length = name->utf8_length();
4829 bool legal = false;
4830
4831 if (length > 0) {
4832 if (_major_version < JAVA_1_5_VERSION) {
4833 if (bytes[0] != '<') {
4834 char* p = skip_over_field_name(bytes, false, length);
4835 legal = (p != NULL) && ((p - bytes) == (int)length);
4836 }
4837 } else {
4838 // 4881221: relax the constraints based on JSR202 spec
4839 legal = verify_unqualified_name(bytes, length, LegalField);
4840 }
4841 }
4842
4843 if (!legal) {
4844 ResourceMark rm(THREAD);
4845 Exceptions::fthrow(
4846 THREAD_AND_LOCATION,
4847 vmSymbols::java_lang_ClassFormatError(),
4848 "Illegal field name \"%s\" in class %s", bytes,
4849 _class_name->as_C_string()
4850 );
4851 return;
4852 }
4853 }
4854
4855 // Checks if name is a legal method name.
4856 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4857 if (!_need_verify || _relax_verify) { return; }
4858
4859 assert(name != NULL, "method name is null");
4860 char buf[fixed_buffer_size];
4861 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4862 unsigned int length = name->utf8_length();
4863 bool legal = false;
4864
4865 if (length > 0) {
4866 if (bytes[0] == '<') {
4867 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4868 legal = true;
4869 }
4870 } else if (_major_version < JAVA_1_5_VERSION) {
4871 char* p;
4872 p = skip_over_field_name(bytes, false, length);
4873 legal = (p != NULL) && ((p - bytes) == (int)length);
4874 } else {
4875 // 4881221: relax the constraints based on JSR202 spec
4876 legal = verify_unqualified_name(bytes, length, LegalMethod);
4877 }
4878 }
4879
4880 if (!legal) {
4881 ResourceMark rm(THREAD);
4882 Exceptions::fthrow(
4883 THREAD_AND_LOCATION,
4884 vmSymbols::java_lang_ClassFormatError(),
4885 "Illegal method name \"%s\" in class %s", bytes,
4886 _class_name->as_C_string()
4887 );
4888 return;
4889 }
4890 }
4891
4892
4893 // Checks if signature is a legal field signature.
4894 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4895 if (!_need_verify) { return; }
4896
4897 char buf[fixed_buffer_size];
4898 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4899 unsigned int length = signature->utf8_length();
4900 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4901
4902 if (p == NULL || (p - bytes) != (int)length) {
4903 throwIllegalSignature("Field", name, signature, CHECK);
4904 }
4905 }
4906
4907 // Checks if signature is a legal method signature.
4908 // Returns number of parameters
4909 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4910 if (!_need_verify) {
4911 // make sure caller's args_size will be less than 0 even for non-static
4912 // method so it will be recomputed in compute_size_of_parameters().
4913 return -2;
4914 }
4915
4916 unsigned int args_size = 0;
4917 char buf[fixed_buffer_size];
4918 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4919 unsigned int length = signature->utf8_length();
4920 char* nextp;
4921
4922 // The first character must be a '('
4923 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4924 length--;
4925 // Skip over legal field signatures
4926 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4927 while ((length > 0) && (nextp != NULL)) {
4928 args_size++;
4929 if (p[0] == 'J' || p[0] == 'D') {
4930 args_size++;
4931 }
4932 length -= nextp - p;
4933 p = nextp;
4934 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4935 }
4936 // The first non-signature thing better be a ')'
4937 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4938 length--;
4939 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4940 // All internal methods must return void
4941 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4942 return args_size;
4943 }
4944 } else {
4945 // Now we better just have a return value
4946 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4947 if (nextp && ((int)length == (nextp - p))) {
4948 return args_size;
4949 }
4950 }
4951 }
4952 }
4953 // Report error
4954 throwIllegalSignature("Method", name, signature, CHECK_0);
4955 return 0;
4956 }
4957
4958
4959 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4960 // Method names also may not contain the characters '<' or '>', unless <init>
4961 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4962 // method. Because these names have been checked as special cases before
4963 // calling this method in verify_legal_method_name.
4964 bool ClassFileParser::verify_unqualified_name(
4965 char* name, unsigned int length, int type) {
4966 jchar ch;
4967
4968 for (char* p = name; p != name + length; ) {
4969 ch = *p;
4970 if (ch < 128) {
4971 p++;
4972 if (ch == '.' || ch == ';' || ch == '[' ) {
4973 return false; // do not permit '.', ';', or '['
4974 }
4975 if (type != LegalClass && ch == '/') {
4976 return false; // do not permit '/' unless it's class name
4977 }
4978 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4979 return false; // do not permit '<' or '>' in method names
4980 }
4981 } else {
4982 char* tmp_p = UTF8::next(p, &ch);
4983 p = tmp_p;
4984 }
4985 }
4986 return true;
4987 }
4988
4989
4990 // Take pointer to a string. Skip over the longest part of the string that could
4991 // be taken as a fieldname. Allow '/' if slash_ok is true.
4992 // Return a pointer to just past the fieldname.
4993 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4994 // being true, we saw consecutive slashes (meaning we were looking for a
4995 // qualified path but found something that was badly-formed).
4996 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4997 char* p;
4998 jchar ch;
4999 jboolean last_is_slash = false;
5000 jboolean not_first_ch = false;
5001
5002 for (p = name; p != name + length; not_first_ch = true) {
5003 char* old_p = p;
5004 ch = *p;
5005 if (ch < 128) {
5006 p++;
5007 // quick check for ascii
5008 if ((ch >= 'a' && ch <= 'z') ||
5009 (ch >= 'A' && ch <= 'Z') ||
5010 (ch == '_' || ch == '$') ||
5011 (not_first_ch && ch >= '0' && ch <= '9')) {
5012 last_is_slash = false;
5013 continue;
5014 }
5015 if (slash_ok && ch == '/') {
5016 if (last_is_slash) {
5017 return NULL; // Don't permit consecutive slashes
5018 }
5019 last_is_slash = true;
5020 continue;
5021 }
5022 } else {
5023 jint unicode_ch;
5024 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5025 p = tmp_p;
5026 last_is_slash = false;
5027 // Check if ch is Java identifier start or is Java identifier part
5028 // 4672820: call java.lang.Character methods directly without generating separate tables.
5029 EXCEPTION_MARK;
5030 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5031
5032 // return value
5033 JavaValue result(T_BOOLEAN);
5034 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5035 JavaCallArguments args;
5036 args.push_int(unicode_ch);
5037
5038 // public static boolean isJavaIdentifierStart(char ch);
5039 JavaCalls::call_static(&result,
5040 klass,
5041 vmSymbols::isJavaIdentifierStart_name(),
5042 vmSymbols::int_bool_signature(),
5043 &args,
5044 THREAD);
5045
5046 if (HAS_PENDING_EXCEPTION) {
5047 CLEAR_PENDING_EXCEPTION;
5048 return 0;
5049 }
5050 if (result.get_jboolean()) {
5051 continue;
5052 }
5053
5054 if (not_first_ch) {
5055 // public static boolean isJavaIdentifierPart(char ch);
5056 JavaCalls::call_static(&result,
5057 klass,
5058 vmSymbols::isJavaIdentifierPart_name(),
5059 vmSymbols::int_bool_signature(),
5060 &args,
5061 THREAD);
5062
5063 if (HAS_PENDING_EXCEPTION) {
5064 CLEAR_PENDING_EXCEPTION;
5065 return 0;
5066 }
5067
5068 if (result.get_jboolean()) {
5069 continue;
5070 }
5071 }
5072 }
5073 return (not_first_ch) ? old_p : NULL;
5074 }
5075 return (not_first_ch) ? p : NULL;
5076 }
5077
5078
5079 // Take pointer to a string. Skip over the longest part of the string that could
5080 // be taken as a field signature. Allow "void" if void_ok.
5081 // Return a pointer to just past the signature.
5082 // Return NULL if no legal signature is found.
5083 char* ClassFileParser::skip_over_field_signature(char* signature,
5084 bool void_ok,
5085 unsigned int length,
5086 TRAPS) {
5087 unsigned int array_dim = 0;
5088 while (length > 0) {
5089 switch (signature[0]) {
5090 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5091 case JVM_SIGNATURE_BOOLEAN:
5092 case JVM_SIGNATURE_BYTE:
5093 case JVM_SIGNATURE_CHAR:
5094 case JVM_SIGNATURE_SHORT:
5095 case JVM_SIGNATURE_INT:
5096 case JVM_SIGNATURE_FLOAT:
5097 case JVM_SIGNATURE_LONG:
5098 case JVM_SIGNATURE_DOUBLE:
5099 return signature + 1;
5100 case JVM_SIGNATURE_CLASS: {
5101 if (_major_version < JAVA_1_5_VERSION) {
5102 // Skip over the class name if one is there
5103 char* p = skip_over_field_name(signature + 1, true, --length);
5104
5105 // The next character better be a semicolon
5106 if (p && (p - signature) > 1 && p[0] == ';') {
5107 return p + 1;
5108 }
5109 } else {
5110 // 4900761: For class version > 48, any unicode is allowed in class name.
5111 length--;
5112 signature++;
5113 while (length > 0 && signature[0] != ';') {
5114 if (signature[0] == '.') {
5115 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5116 }
5117 length--;
5118 signature++;
5119 }
5120 if (signature[0] == ';') { return signature + 1; }
5121 }
5122
5123 return NULL;
5124 }
5125 case JVM_SIGNATURE_ARRAY:
5126 array_dim++;
5127 if (array_dim > 255) {
5128 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5129 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5130 }
5131 // The rest of what's there better be a legal signature
5132 signature++;
5133 length--;
5134 void_ok = false;
5135 break;
5136
5137 default:
5138 return NULL;
5139 }
5140 }
5141 return NULL;
5142 }