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_misc_Contended_signature):
1779 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1780 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1781 return _sun_misc_Contended;
1782 default: break;
1783 }
1784 return AnnotationCollector::_unknown;
1785 }
1786
1787 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1788 if (is_contended())
1789 f->set_contended_group(contended_group());
1790 }
1791
1792 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1793 // If there's an error deallocate metadata for field annotations
1794 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1795 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1796 }
1797
1798 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1799 if (has_annotation(_method_CallerSensitive))
1800 m->set_caller_sensitive(true);
1801 if (has_annotation(_method_ForceInline))
1802 m->set_force_inline(true);
1803 if (has_annotation(_method_DontInline))
1804 m->set_dont_inline(true);
1805 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1806 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1807 if (has_annotation(_method_LambdaForm_Hidden))
1808 m->set_hidden(true);
1809 }
1810
1811 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1812 k->set_is_contended(is_contended());
1813 }
1814
1815
1816 #define MAX_ARGS_SIZE 255
1817 #define MAX_CODE_SIZE 65535
1818 #define INITIAL_MAX_LVT_NUMBER 256
1819
1820 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1821 *
1822 * Rules for LVT's and LVTT's are:
1823 * - There can be any number of LVT's and LVTT's.
1824 * - If there are n LVT's, it is the same as if there was just
1825 * one LVT containing all the entries from the n LVT's.
1826 * - There may be no more than one LVT entry per local variable.
1827 * Two LVT entries are 'equal' if these fields are the same:
1828 * start_pc, length, name, slot
1829 * - There may be no more than one LVTT entry per each LVT entry.
1830 * Each LVTT entry has to match some LVT entry.
1831 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1832 */
1833 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1834 int lvt_cnt,
1835 u2* localvariable_table_length,
1836 u2** localvariable_table_start,
1837 int lvtt_cnt,
1838 u2* localvariable_type_table_length,
1839 u2** localvariable_type_table_start,
1840 TRAPS) {
1841
1842 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1843 initialize_hashtable(lvt_Hash);
1844
1845 // To fill LocalVariableTable in
1846 Classfile_LVT_Element* cf_lvt;
1847 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1848
1849 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1850 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1851 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1852 copy_lvt_element(&cf_lvt[idx], lvt);
1853 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1854 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1855 && _need_verify
1856 && _major_version >= JAVA_1_5_VERSION) {
1857 clear_hashtable(lvt_Hash);
1858 classfile_parse_error("Duplicated LocalVariableTable attribute "
1859 "entry for '%s' in class file %s",
1860 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1861 CHECK);
1862 }
1863 }
1864 }
1865
1866 // To merge LocalVariableTable and LocalVariableTypeTable
1867 Classfile_LVT_Element* cf_lvtt;
1868 LocalVariableTableElement lvtt_elem;
1869
1870 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1871 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1872 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1873 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1874 int index = hash(&lvtt_elem);
1875 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1876 if (entry == NULL) {
1877 if (_need_verify) {
1878 clear_hashtable(lvt_Hash);
1879 classfile_parse_error("LVTT entry for '%s' in class file %s "
1880 "does not match any LVT entry",
1881 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1882 CHECK);
1883 }
1884 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1885 clear_hashtable(lvt_Hash);
1886 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1887 "entry for '%s' in class file %s",
1888 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1889 CHECK);
1890 } else {
1891 // to add generic signatures into LocalVariableTable
1892 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1893 }
1894 }
1895 }
1896 clear_hashtable(lvt_Hash);
1897 }
1898
1899
1900 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1901 u1* runtime_visible_annotations,
1902 int runtime_visible_annotations_length,
1903 u1* runtime_invisible_annotations,
1904 int runtime_invisible_annotations_length,
1905 u1* runtime_visible_parameter_annotations,
1906 int runtime_visible_parameter_annotations_length,
1907 u1* runtime_invisible_parameter_annotations,
1908 int runtime_invisible_parameter_annotations_length,
1909 u1* runtime_visible_type_annotations,
1910 int runtime_visible_type_annotations_length,
1911 u1* runtime_invisible_type_annotations,
1912 int runtime_invisible_type_annotations_length,
1913 u1* annotation_default,
1914 int annotation_default_length,
1915 TRAPS) {
1916
1917 AnnotationArray* a;
1918
1919 if (runtime_visible_annotations_length +
1920 runtime_invisible_annotations_length > 0) {
1921 a = assemble_annotations(runtime_visible_annotations,
1922 runtime_visible_annotations_length,
1923 runtime_invisible_annotations,
1924 runtime_invisible_annotations_length,
1925 CHECK);
1926 cm->set_method_annotations(a);
1927 }
1928
1929 if (runtime_visible_parameter_annotations_length +
1930 runtime_invisible_parameter_annotations_length > 0) {
1931 a = assemble_annotations(runtime_visible_parameter_annotations,
1932 runtime_visible_parameter_annotations_length,
1933 runtime_invisible_parameter_annotations,
1934 runtime_invisible_parameter_annotations_length,
1935 CHECK);
1936 cm->set_parameter_annotations(a);
1937 }
1938
1939 if (annotation_default_length > 0) {
1940 a = assemble_annotations(annotation_default,
1941 annotation_default_length,
1942 NULL,
1943 0,
1944 CHECK);
1945 cm->set_default_annotations(a);
1946 }
1947
1948 if (runtime_visible_type_annotations_length +
1949 runtime_invisible_type_annotations_length > 0) {
1950 a = assemble_annotations(runtime_visible_type_annotations,
1951 runtime_visible_type_annotations_length,
1952 runtime_invisible_type_annotations,
1953 runtime_invisible_type_annotations_length,
1954 CHECK);
1955 cm->set_type_annotations(a);
1956 }
1957 }
1958
1959
1960 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1961 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1962 // Method* to save footprint, so we only know the size of the resulting Method* when the
1963 // entire method attribute is parsed.
1964 //
1965 // The promoted_flags parameter is used to pass relevant access_flags
1966 // from the method back up to the containing klass. These flag values
1967 // are added to klass's access_flags.
1968
1969 methodHandle ClassFileParser::parse_method(bool is_interface,
1970 AccessFlags *promoted_flags,
1971 TRAPS) {
1972 ClassFileStream* cfs = stream();
1973 methodHandle nullHandle;
1974 ResourceMark rm(THREAD);
1975 // Parse fixed parts
1976 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1977
1978 int flags = cfs->get_u2_fast();
1979 u2 name_index = cfs->get_u2_fast();
1980 int cp_size = _cp->length();
1981 check_property(
1982 valid_symbol_at(name_index),
1983 "Illegal constant pool index %u for method name in class file %s",
1984 name_index, CHECK_(nullHandle));
1985 Symbol* name = _cp->symbol_at(name_index);
1986 verify_legal_method_name(name, CHECK_(nullHandle));
1987
1988 u2 signature_index = cfs->get_u2_fast();
1989 guarantee_property(
1990 valid_symbol_at(signature_index),
1991 "Illegal constant pool index %u for method signature in class file %s",
1992 signature_index, CHECK_(nullHandle));
1993 Symbol* signature = _cp->symbol_at(signature_index);
1994
1995 AccessFlags access_flags;
1996 if (name == vmSymbols::class_initializer_name()) {
1997 // We ignore the other access flags for a valid class initializer.
1998 // (JVM Spec 2nd ed., chapter 4.6)
1999 if (_major_version < 51) { // backward compatibility
2000 flags = JVM_ACC_STATIC;
2001 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2002 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2003 }
2004 } else {
2005 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2006 }
2007
2008 int args_size = -1; // only used when _need_verify is true
2009 if (_need_verify) {
2010 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2011 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2012 if (args_size > MAX_ARGS_SIZE) {
2013 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2014 }
2015 }
2016
2017 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2018
2019 // Default values for code and exceptions attribute elements
2020 u2 max_stack = 0;
2021 u2 max_locals = 0;
2022 u4 code_length = 0;
2023 u1* code_start = 0;
2024 u2 exception_table_length = 0;
2025 u2* exception_table_start = NULL;
2026 Array<int>* exception_handlers = Universe::the_empty_int_array();
2027 u2 checked_exceptions_length = 0;
2028 u2* checked_exceptions_start = NULL;
2029 CompressedLineNumberWriteStream* linenumber_table = NULL;
2030 int linenumber_table_length = 0;
2031 int total_lvt_length = 0;
2032 u2 lvt_cnt = 0;
2033 u2 lvtt_cnt = 0;
2034 bool lvt_allocated = false;
2035 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2036 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2037 u2* localvariable_table_length;
2038 u2** localvariable_table_start;
2039 u2* localvariable_type_table_length;
2040 u2** localvariable_type_table_start;
2041 u2 method_parameters_length = 0;
2042 u1* method_parameters_data = NULL;
2043 bool method_parameters_seen = false;
2044 bool parsed_code_attribute = false;
2045 bool parsed_checked_exceptions_attribute = false;
2046 bool parsed_stackmap_attribute = false;
2047 // stackmap attribute - JDK1.5
2048 u1* stackmap_data = NULL;
2049 int stackmap_data_length = 0;
2050 u2 generic_signature_index = 0;
2051 MethodAnnotationCollector parsed_annotations;
2052 u1* runtime_visible_annotations = NULL;
2053 int runtime_visible_annotations_length = 0;
2054 u1* runtime_invisible_annotations = NULL;
2055 int runtime_invisible_annotations_length = 0;
2056 u1* runtime_visible_parameter_annotations = NULL;
2057 int runtime_visible_parameter_annotations_length = 0;
2058 u1* runtime_invisible_parameter_annotations = NULL;
2059 int runtime_invisible_parameter_annotations_length = 0;
2060 u1* runtime_visible_type_annotations = NULL;
2061 int runtime_visible_type_annotations_length = 0;
2062 u1* runtime_invisible_type_annotations = NULL;
2063 int runtime_invisible_type_annotations_length = 0;
2064 u1* annotation_default = NULL;
2065 int annotation_default_length = 0;
2066
2067 // Parse code and exceptions attribute
2068 u2 method_attributes_count = cfs->get_u2_fast();
2069 while (method_attributes_count--) {
2070 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2071 u2 method_attribute_name_index = cfs->get_u2_fast();
2072 u4 method_attribute_length = cfs->get_u4_fast();
2073 check_property(
2074 valid_symbol_at(method_attribute_name_index),
2075 "Invalid method attribute name index %u in class file %s",
2076 method_attribute_name_index, CHECK_(nullHandle));
2077
2078 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2079 if (method_attribute_name == vmSymbols::tag_code()) {
2080 // Parse Code attribute
2081 if (_need_verify) {
2082 guarantee_property(
2083 !access_flags.is_native() && !access_flags.is_abstract(),
2084 "Code attribute in native or abstract methods in class file %s",
2085 CHECK_(nullHandle));
2086 }
2087 if (parsed_code_attribute) {
2088 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2089 }
2090 parsed_code_attribute = true;
2091
2092 // Stack size, locals size, and code size
2093 if (_major_version == 45 && _minor_version <= 2) {
2094 cfs->guarantee_more(4, CHECK_(nullHandle));
2095 max_stack = cfs->get_u1_fast();
2096 max_locals = cfs->get_u1_fast();
2097 code_length = cfs->get_u2_fast();
2098 } else {
2099 cfs->guarantee_more(8, CHECK_(nullHandle));
2100 max_stack = cfs->get_u2_fast();
2101 max_locals = cfs->get_u2_fast();
2102 code_length = cfs->get_u4_fast();
2103 }
2104 if (_need_verify) {
2105 guarantee_property(args_size <= max_locals,
2106 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2107 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2108 "Invalid method Code length %u in class file %s",
2109 code_length, CHECK_(nullHandle));
2110 }
2111 // Code pointer
2112 code_start = cfs->get_u1_buffer();
2113 assert(code_start != NULL, "null code start");
2114 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2115 cfs->skip_u1_fast(code_length);
2116
2117 // Exception handler table
2118 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2119 exception_table_length = cfs->get_u2_fast();
2120 if (exception_table_length > 0) {
2121 exception_table_start =
2122 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2123 }
2124
2125 // Parse additional attributes in code attribute
2126 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2127 u2 code_attributes_count = cfs->get_u2_fast();
2128
2129 unsigned int calculated_attribute_length = 0;
2130
2131 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2132 calculated_attribute_length =
2133 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2134 } else {
2135 // max_stack, locals and length are smaller in pre-version 45.2 classes
2136 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2137 }
2138 calculated_attribute_length +=
2139 code_length +
2140 sizeof(exception_table_length) +
2141 sizeof(code_attributes_count) +
2142 exception_table_length *
2143 ( sizeof(u2) + // start_pc
2144 sizeof(u2) + // end_pc
2145 sizeof(u2) + // handler_pc
2146 sizeof(u2) ); // catch_type_index
2147
2148 while (code_attributes_count--) {
2149 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2150 u2 code_attribute_name_index = cfs->get_u2_fast();
2151 u4 code_attribute_length = cfs->get_u4_fast();
2152 calculated_attribute_length += code_attribute_length +
2153 sizeof(code_attribute_name_index) +
2154 sizeof(code_attribute_length);
2155 check_property(valid_symbol_at(code_attribute_name_index),
2156 "Invalid code attribute name index %u in class file %s",
2157 code_attribute_name_index,
2158 CHECK_(nullHandle));
2159 if (LoadLineNumberTables &&
2160 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2161 // Parse and compress line number table
2162 parse_linenumber_table(code_attribute_length, code_length,
2163 &linenumber_table, CHECK_(nullHandle));
2164
2165 } else if (LoadLocalVariableTables &&
2166 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2167 // Parse local variable table
2168 if (!lvt_allocated) {
2169 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2170 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2171 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2172 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2173 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2174 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2175 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2176 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2177 lvt_allocated = true;
2178 }
2179 if (lvt_cnt == max_lvt_cnt) {
2180 max_lvt_cnt <<= 1;
2181 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2182 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2183 }
2184 localvariable_table_start[lvt_cnt] =
2185 parse_localvariable_table(code_length,
2186 max_locals,
2187 code_attribute_length,
2188 &localvariable_table_length[lvt_cnt],
2189 false, // is not LVTT
2190 CHECK_(nullHandle));
2191 total_lvt_length += localvariable_table_length[lvt_cnt];
2192 lvt_cnt++;
2193 } else if (LoadLocalVariableTypeTables &&
2194 _major_version >= JAVA_1_5_VERSION &&
2195 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2196 if (!lvt_allocated) {
2197 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2198 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2199 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2200 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2201 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2202 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2203 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2204 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2205 lvt_allocated = true;
2206 }
2207 // Parse local variable type table
2208 if (lvtt_cnt == max_lvtt_cnt) {
2209 max_lvtt_cnt <<= 1;
2210 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2211 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2212 }
2213 localvariable_type_table_start[lvtt_cnt] =
2214 parse_localvariable_table(code_length,
2215 max_locals,
2216 code_attribute_length,
2217 &localvariable_type_table_length[lvtt_cnt],
2218 true, // is LVTT
2219 CHECK_(nullHandle));
2220 lvtt_cnt++;
2221 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2222 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2223 // Stack map is only needed by the new verifier in JDK1.5.
2224 if (parsed_stackmap_attribute) {
2225 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2226 }
2227 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2228 stackmap_data_length = code_attribute_length;
2229 parsed_stackmap_attribute = true;
2230 } else {
2231 // Skip unknown attributes
2232 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2233 }
2234 }
2235 // check method attribute length
2236 if (_need_verify) {
2237 guarantee_property(method_attribute_length == calculated_attribute_length,
2238 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2239 }
2240 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2241 // Parse Exceptions attribute
2242 if (parsed_checked_exceptions_attribute) {
2243 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2244 }
2245 parsed_checked_exceptions_attribute = true;
2246 checked_exceptions_start =
2247 parse_checked_exceptions(&checked_exceptions_length,
2248 method_attribute_length,
2249 CHECK_(nullHandle));
2250 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2251 // reject multiple method parameters
2252 if (method_parameters_seen) {
2253 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2254 }
2255 method_parameters_seen = true;
2256 method_parameters_length = cfs->get_u1_fast();
2257 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2258 classfile_parse_error(
2259 "Invalid MethodParameters method attribute length %u in class file",
2260 method_attribute_length, CHECK_(nullHandle));
2261 }
2262 method_parameters_data = cfs->get_u1_buffer();
2263 cfs->skip_u2_fast(method_parameters_length);
2264 cfs->skip_u2_fast(method_parameters_length);
2265 // ignore this attribute if it cannot be reflected
2266 if (!SystemDictionary::Parameter_klass_loaded())
2267 method_parameters_length = 0;
2268 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2269 if (method_attribute_length != 0) {
2270 classfile_parse_error(
2271 "Invalid Synthetic method attribute length %u in class file %s",
2272 method_attribute_length, CHECK_(nullHandle));
2273 }
2274 // Should we check that there hasn't already been a synthetic attribute?
2275 access_flags.set_is_synthetic();
2276 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2277 if (method_attribute_length != 0) {
2278 classfile_parse_error(
2279 "Invalid Deprecated method attribute length %u in class file %s",
2280 method_attribute_length, CHECK_(nullHandle));
2281 }
2282 } else if (_major_version >= JAVA_1_5_VERSION) {
2283 if (method_attribute_name == vmSymbols::tag_signature()) {
2284 if (method_attribute_length != 2) {
2285 classfile_parse_error(
2286 "Invalid Signature attribute length %u in class file %s",
2287 method_attribute_length, CHECK_(nullHandle));
2288 }
2289 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index
2290 generic_signature_index = cfs->get_u2_fast();
2291 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2292 runtime_visible_annotations_length = method_attribute_length;
2293 runtime_visible_annotations = cfs->get_u1_buffer();
2294 assert(runtime_visible_annotations != NULL, "null visible annotations");
2295 parse_annotations(runtime_visible_annotations,
2296 runtime_visible_annotations_length, &parsed_annotations,
2297 CHECK_(nullHandle));
2298 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2299 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2300 runtime_invisible_annotations_length = method_attribute_length;
2301 runtime_invisible_annotations = cfs->get_u1_buffer();
2302 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2303 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2304 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2305 runtime_visible_parameter_annotations_length = method_attribute_length;
2306 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2307 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2308 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2309 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2310 runtime_invisible_parameter_annotations_length = method_attribute_length;
2311 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2312 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2313 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2314 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2315 annotation_default_length = method_attribute_length;
2316 annotation_default = cfs->get_u1_buffer();
2317 assert(annotation_default != NULL, "null annotation default");
2318 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2319 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2320 runtime_visible_type_annotations_length = method_attribute_length;
2321 runtime_visible_type_annotations = cfs->get_u1_buffer();
2322 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2323 // No need for the VM to parse Type annotations
2324 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2325 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2326 runtime_invisible_type_annotations_length = method_attribute_length;
2327 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2328 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2329 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2330 } else {
2331 // Skip unknown attributes
2332 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2333 }
2334 } else {
2335 // Skip unknown attributes
2336 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2337 }
2338 }
2339
2340 if (linenumber_table != NULL) {
2341 linenumber_table->write_terminator();
2342 linenumber_table_length = linenumber_table->position();
2343 }
2344
2345 // Make sure there's at least one Code attribute in non-native/non-abstract method
2346 if (_need_verify) {
2347 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2348 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2349 }
2350
2351 // All sizing information for a Method* is finally available, now create it
2352 InlineTableSizes sizes(
2353 total_lvt_length,
2354 linenumber_table_length,
2355 exception_table_length,
2356 checked_exceptions_length,
2357 method_parameters_length,
2358 generic_signature_index,
2359 runtime_visible_annotations_length +
2360 runtime_invisible_annotations_length,
2361 runtime_visible_parameter_annotations_length +
2362 runtime_invisible_parameter_annotations_length,
2363 runtime_visible_type_annotations_length +
2364 runtime_invisible_type_annotations_length,
2365 annotation_default_length,
2366 0);
2367
2368 Method* m = Method::allocate(
2369 _loader_data, code_length, access_flags, &sizes,
2370 ConstMethod::NORMAL, CHECK_(nullHandle));
2371
2372 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2373
2374 // Fill in information from fixed part (access_flags already set)
2375 m->set_constants(_cp);
2376 m->set_name_index(name_index);
2377 m->set_signature_index(signature_index);
2378 #ifdef CC_INTERP
2379 // hmm is there a gc issue here??
2380 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2381 m->set_result_index(rtf.type());
2382 #endif
2383
2384 if (args_size >= 0) {
2385 m->set_size_of_parameters(args_size);
2386 } else {
2387 m->compute_size_of_parameters(THREAD);
2388 }
2389 #ifdef ASSERT
2390 if (args_size >= 0) {
2391 m->compute_size_of_parameters(THREAD);
2392 assert(args_size == m->size_of_parameters(), "");
2393 }
2394 #endif
2395
2396 // Fill in code attribute information
2397 m->set_max_stack(max_stack);
2398 m->set_max_locals(max_locals);
2399 if (stackmap_data != NULL) {
2400 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2401 stackmap_data_length, CHECK_NULL);
2402 }
2403
2404 // Copy byte codes
2405 m->set_code(code_start);
2406
2407 // Copy line number table
2408 if (linenumber_table != NULL) {
2409 memcpy(m->compressed_linenumber_table(),
2410 linenumber_table->buffer(), linenumber_table_length);
2411 }
2412
2413 // Copy exception table
2414 if (exception_table_length > 0) {
2415 int size =
2416 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2417 copy_u2_with_conversion((u2*) m->exception_table_start(),
2418 exception_table_start, size);
2419 }
2420
2421 // Copy method parameters
2422 if (method_parameters_length > 0) {
2423 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2424 for (int i = 0; i < method_parameters_length; i++) {
2425 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2426 method_parameters_data += 2;
2427 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2428 method_parameters_data += 2;
2429 }
2430 }
2431
2432 // Copy checked exceptions
2433 if (checked_exceptions_length > 0) {
2434 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2435 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2436 }
2437
2438 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2439 if (total_lvt_length > 0) {
2440 promoted_flags->set_has_localvariable_table();
2441 copy_localvariable_table(m->constMethod(), lvt_cnt,
2442 localvariable_table_length,
2443 localvariable_table_start,
2444 lvtt_cnt,
2445 localvariable_type_table_length,
2446 localvariable_type_table_start, CHECK_NULL);
2447 }
2448
2449 if (parsed_annotations.has_any_annotations())
2450 parsed_annotations.apply_to(m);
2451
2452 // Copy annotations
2453 copy_method_annotations(m->constMethod(),
2454 runtime_visible_annotations,
2455 runtime_visible_annotations_length,
2456 runtime_invisible_annotations,
2457 runtime_invisible_annotations_length,
2458 runtime_visible_parameter_annotations,
2459 runtime_visible_parameter_annotations_length,
2460 runtime_invisible_parameter_annotations,
2461 runtime_invisible_parameter_annotations_length,
2462 runtime_visible_type_annotations,
2463 runtime_visible_type_annotations_length,
2464 runtime_invisible_type_annotations,
2465 runtime_invisible_type_annotations_length,
2466 annotation_default,
2467 annotation_default_length,
2468 CHECK_NULL);
2469
2470 if (name == vmSymbols::finalize_method_name() &&
2471 signature == vmSymbols::void_method_signature()) {
2472 if (m->is_empty_method()) {
2473 _has_empty_finalizer = true;
2474 } else {
2475 _has_finalizer = true;
2476 }
2477 }
2478 if (name == vmSymbols::object_initializer_name() &&
2479 signature == vmSymbols::void_method_signature() &&
2480 m->is_vanilla_constructor()) {
2481 _has_vanilla_constructor = true;
2482 }
2483
2484 NOT_PRODUCT(m->verify());
2485 return m;
2486 }
2487
2488
2489 // The promoted_flags parameter is used to pass relevant access_flags
2490 // from the methods back up to the containing klass. These flag values
2491 // are added to klass's access_flags.
2492
2493 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2494 AccessFlags* promoted_flags,
2495 bool* has_final_method,
2496 bool* has_default_methods,
2497 TRAPS) {
2498 ClassFileStream* cfs = stream();
2499 cfs->guarantee_more(2, CHECK_NULL); // length
2500 u2 length = cfs->get_u2_fast();
2501 if (length == 0) {
2502 _methods = Universe::the_empty_method_array();
2503 } else {
2504 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2505
2506 HandleMark hm(THREAD);
2507 for (int index = 0; index < length; index++) {
2508 methodHandle method = parse_method(is_interface,
2509 promoted_flags,
2510 CHECK_NULL);
2511
2512 if (method->is_final()) {
2513 *has_final_method = true;
2514 }
2515 if (is_interface && !method->is_abstract() && !method->is_static()) {
2516 // default method
2517 *has_default_methods = true;
2518 }
2519 _methods->at_put(index, method());
2520 }
2521
2522 if (_need_verify && length > 1) {
2523 // Check duplicated methods
2524 ResourceMark rm(THREAD);
2525 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2526 THREAD, NameSigHash*, HASH_ROW_SIZE);
2527 initialize_hashtable(names_and_sigs);
2528 bool dup = false;
2529 {
2530 debug_only(No_Safepoint_Verifier nsv;)
2531 for (int i = 0; i < length; i++) {
2532 Method* m = _methods->at(i);
2533 // If no duplicates, add name/signature in hashtable names_and_sigs.
2534 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2535 dup = true;
2536 break;
2537 }
2538 }
2539 }
2540 if (dup) {
2541 classfile_parse_error("Duplicate method name&signature in class file %s",
2542 CHECK_NULL);
2543 }
2544 }
2545 }
2546 return _methods;
2547 }
2548
2549
2550 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2551 int length = methods->length();
2552 // If JVMTI original method ordering or sharing is enabled we have to
2553 // remember the original class file ordering.
2554 // We temporarily use the vtable_index field in the Method* to store the
2555 // class file index, so we can read in after calling qsort.
2556 // Put the method ordering in the shared archive.
2557 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2558 for (int index = 0; index < length; index++) {
2559 Method* m = methods->at(index);
2560 assert(!m->valid_vtable_index(), "vtable index should not be set");
2561 m->set_vtable_index(index);
2562 }
2563 }
2564 // Sort method array by ascending method name (for faster lookups & vtable construction)
2565 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2566 Method::sort_methods(methods);
2567
2568 intArray* method_ordering = NULL;
2569 // If JVMTI original method ordering or sharing is enabled construct int
2570 // array remembering the original ordering
2571 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2572 method_ordering = new intArray(length);
2573 for (int index = 0; index < length; index++) {
2574 Method* m = methods->at(index);
2575 int old_index = m->vtable_index();
2576 assert(old_index >= 0 && old_index < length, "invalid method index");
2577 method_ordering->at_put(index, old_index);
2578 m->set_vtable_index(Method::invalid_vtable_index);
2579 }
2580 }
2581 return method_ordering;
2582 }
2583
2584
2585 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2586 ClassFileStream* cfs = stream();
2587 cfs->guarantee_more(2, CHECK); // sourcefile_index
2588 u2 sourcefile_index = cfs->get_u2_fast();
2589 check_property(
2590 valid_symbol_at(sourcefile_index),
2591 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2592 sourcefile_index, CHECK);
2593 set_class_sourcefile(_cp->symbol_at(sourcefile_index));
2594 }
2595
2596
2597
2598 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2599 ClassFileStream* cfs = stream();
2600 u1* sde_buffer = cfs->get_u1_buffer();
2601 assert(sde_buffer != NULL, "null sde buffer");
2602
2603 // Don't bother storing it if there is no way to retrieve it
2604 if (JvmtiExport::can_get_source_debug_extension()) {
2605 assert((length+1) > length, "Overflow checking");
2606 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2607 for (int i = 0; i < length; i++) {
2608 sde[i] = sde_buffer[i];
2609 }
2610 sde[length] = '\0';
2611 set_class_sde_buffer((char*)sde, length);
2612 }
2613 // Got utf8 string, set stream position forward
2614 cfs->skip_u1(length, CHECK);
2615 }
2616
2617
2618 // Inner classes can be static, private or protected (classic VM does this)
2619 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2620
2621 // Return number of classes in the inner classes attribute table
2622 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2623 bool parsed_enclosingmethod_attribute,
2624 u2 enclosing_method_class_index,
2625 u2 enclosing_method_method_index,
2626 TRAPS) {
2627 ClassFileStream* cfs = stream();
2628 u1* current_mark = cfs->current();
2629 u2 length = 0;
2630 if (inner_classes_attribute_start != NULL) {
2631 cfs->set_current(inner_classes_attribute_start);
2632 cfs->guarantee_more(2, CHECK_0); // length
2633 length = cfs->get_u2_fast();
2634 }
2635
2636 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2637 // method data:
2638 // [inner_class_info_index,
2639 // outer_class_info_index,
2640 // inner_name_index,
2641 // inner_class_access_flags,
2642 // ...
2643 // enclosing_method_class_index,
2644 // enclosing_method_method_index]
2645 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2646 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2647 _inner_classes = inner_classes;
2648
2649 int index = 0;
2650 int cp_size = _cp->length();
2651 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2652 for (int n = 0; n < length; n++) {
2653 // Inner class index
2654 u2 inner_class_info_index = cfs->get_u2_fast();
2655 check_property(
2656 inner_class_info_index == 0 ||
2657 valid_klass_reference_at(inner_class_info_index),
2658 "inner_class_info_index %u has bad constant type in class file %s",
2659 inner_class_info_index, CHECK_0);
2660 // Outer class index
2661 u2 outer_class_info_index = cfs->get_u2_fast();
2662 check_property(
2663 outer_class_info_index == 0 ||
2664 valid_klass_reference_at(outer_class_info_index),
2665 "outer_class_info_index %u has bad constant type in class file %s",
2666 outer_class_info_index, CHECK_0);
2667 // Inner class name
2668 u2 inner_name_index = cfs->get_u2_fast();
2669 check_property(
2670 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2671 "inner_name_index %u has bad constant type in class file %s",
2672 inner_name_index, CHECK_0);
2673 if (_need_verify) {
2674 guarantee_property(inner_class_info_index != outer_class_info_index,
2675 "Class is both outer and inner class in class file %s", CHECK_0);
2676 }
2677 // Access flags
2678 AccessFlags inner_access_flags;
2679 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2680 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2681 // Set abstract bit for old class files for backward compatibility
2682 flags |= JVM_ACC_ABSTRACT;
2683 }
2684 verify_legal_class_modifiers(flags, CHECK_0);
2685 inner_access_flags.set_flags(flags);
2686
2687 inner_classes->at_put(index++, inner_class_info_index);
2688 inner_classes->at_put(index++, outer_class_info_index);
2689 inner_classes->at_put(index++, inner_name_index);
2690 inner_classes->at_put(index++, inner_access_flags.as_short());
2691 }
2692
2693 // 4347400: make sure there's no duplicate entry in the classes array
2694 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2695 for(int i = 0; i < length * 4; i += 4) {
2696 for(int j = i + 4; j < length * 4; j += 4) {
2697 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2698 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2699 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2700 inner_classes->at(i+3) != inner_classes->at(j+3)),
2701 "Duplicate entry in InnerClasses in class file %s",
2702 CHECK_0);
2703 }
2704 }
2705 }
2706
2707 // Set EnclosingMethod class and method indexes.
2708 if (parsed_enclosingmethod_attribute) {
2709 inner_classes->at_put(index++, enclosing_method_class_index);
2710 inner_classes->at_put(index++, enclosing_method_method_index);
2711 }
2712 assert(index == size, "wrong size");
2713
2714 // Restore buffer's current position.
2715 cfs->set_current(current_mark);
2716
2717 return length;
2718 }
2719
2720 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2721 set_class_synthetic_flag(true);
2722 }
2723
2724 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2725 ClassFileStream* cfs = stream();
2726 u2 signature_index = cfs->get_u2(CHECK);
2727 check_property(
2728 valid_symbol_at(signature_index),
2729 "Invalid constant pool index %u in Signature attribute in class file %s",
2730 signature_index, CHECK);
2731 set_class_generic_signature(_cp->symbol_at(signature_index));
2732 }
2733
2734 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2735 ClassFileStream* cfs = stream();
2736 u1* current_start = cfs->current();
2737
2738 cfs->guarantee_more(2, CHECK); // length
2739 int attribute_array_length = cfs->get_u2_fast();
2740
2741 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2742 "Short length on BootstrapMethods in class file %s",
2743 CHECK);
2744
2745 // The attribute contains a counted array of counted tuples of shorts,
2746 // represending bootstrap specifiers:
2747 // length*{bootstrap_method_index, argument_count*{argument_index}}
2748 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2749 // operand_count = number of shorts in attr, except for leading length
2750
2751 // The attribute is copied into a short[] array.
2752 // The array begins with a series of short[2] pairs, one for each tuple.
2753 int index_size = (attribute_array_length * 2);
2754
2755 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2756
2757 // Eagerly assign operands so they will be deallocated with the constant
2758 // pool if there is an error.
2759 _cp->set_operands(operands);
2760
2761 int operand_fill_index = index_size;
2762 int cp_size = _cp->length();
2763
2764 for (int n = 0; n < attribute_array_length; n++) {
2765 // Store a 32-bit offset into the header of the operand array.
2766 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2767
2768 // Read a bootstrap specifier.
2769 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2770 u2 bootstrap_method_index = cfs->get_u2_fast();
2771 u2 argument_count = cfs->get_u2_fast();
2772 check_property(
2773 valid_cp_range(bootstrap_method_index, cp_size) &&
2774 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2775 "bootstrap_method_index %u has bad constant type in class file %s",
2776 bootstrap_method_index,
2777 CHECK);
2778 operands->at_put(operand_fill_index++, bootstrap_method_index);
2779 operands->at_put(operand_fill_index++, argument_count);
2780
2781 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2782 for (int j = 0; j < argument_count; j++) {
2783 u2 argument_index = cfs->get_u2_fast();
2784 check_property(
2785 valid_cp_range(argument_index, cp_size) &&
2786 _cp->tag_at(argument_index).is_loadable_constant(),
2787 "argument_index %u has bad constant type in class file %s",
2788 argument_index,
2789 CHECK);
2790 operands->at_put(operand_fill_index++, argument_index);
2791 }
2792 }
2793
2794 assert(operand_fill_index == operands->length(), "exact fill");
2795 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2796
2797 u1* current_end = cfs->current();
2798 guarantee_property(current_end == current_start + attribute_byte_length,
2799 "Bad length on BootstrapMethods in class file %s",
2800 CHECK);
2801 }
2802
2803 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2804 TRAPS) {
2805 ClassFileStream* cfs = stream();
2806 // Set inner classes attribute to default sentinel
2807 _inner_classes = Universe::the_empty_short_array();
2808 cfs->guarantee_more(2, CHECK); // attributes_count
2809 u2 attributes_count = cfs->get_u2_fast();
2810 bool parsed_sourcefile_attribute = false;
2811 bool parsed_innerclasses_attribute = false;
2812 bool parsed_enclosingmethod_attribute = false;
2813 bool parsed_bootstrap_methods_attribute = false;
2814 u1* runtime_visible_annotations = NULL;
2815 int runtime_visible_annotations_length = 0;
2816 u1* runtime_invisible_annotations = NULL;
2817 int runtime_invisible_annotations_length = 0;
2818 u1* runtime_visible_type_annotations = NULL;
2819 int runtime_visible_type_annotations_length = 0;
2820 u1* runtime_invisible_type_annotations = NULL;
2821 int runtime_invisible_type_annotations_length = 0;
2822 u1* inner_classes_attribute_start = NULL;
2823 u4 inner_classes_attribute_length = 0;
2824 u2 enclosing_method_class_index = 0;
2825 u2 enclosing_method_method_index = 0;
2826 // Iterate over attributes
2827 while (attributes_count--) {
2828 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2829 u2 attribute_name_index = cfs->get_u2_fast();
2830 u4 attribute_length = cfs->get_u4_fast();
2831 check_property(
2832 valid_symbol_at(attribute_name_index),
2833 "Attribute name has bad constant pool index %u in class file %s",
2834 attribute_name_index, CHECK);
2835 Symbol* tag = _cp->symbol_at(attribute_name_index);
2836 if (tag == vmSymbols::tag_source_file()) {
2837 // Check for SourceFile tag
2838 if (_need_verify) {
2839 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2840 }
2841 if (parsed_sourcefile_attribute) {
2842 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2843 } else {
2844 parsed_sourcefile_attribute = true;
2845 }
2846 parse_classfile_sourcefile_attribute(CHECK);
2847 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2848 // Check for SourceDebugExtension tag
2849 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2850 } else if (tag == vmSymbols::tag_inner_classes()) {
2851 // Check for InnerClasses tag
2852 if (parsed_innerclasses_attribute) {
2853 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2854 } else {
2855 parsed_innerclasses_attribute = true;
2856 }
2857 inner_classes_attribute_start = cfs->get_u1_buffer();
2858 inner_classes_attribute_length = attribute_length;
2859 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2860 } else if (tag == vmSymbols::tag_synthetic()) {
2861 // Check for Synthetic tag
2862 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2863 if (attribute_length != 0) {
2864 classfile_parse_error(
2865 "Invalid Synthetic classfile attribute length %u in class file %s",
2866 attribute_length, CHECK);
2867 }
2868 parse_classfile_synthetic_attribute(CHECK);
2869 } else if (tag == vmSymbols::tag_deprecated()) {
2870 // Check for Deprecatd tag - 4276120
2871 if (attribute_length != 0) {
2872 classfile_parse_error(
2873 "Invalid Deprecated classfile attribute length %u in class file %s",
2874 attribute_length, CHECK);
2875 }
2876 } else if (_major_version >= JAVA_1_5_VERSION) {
2877 if (tag == vmSymbols::tag_signature()) {
2878 if (attribute_length != 2) {
2879 classfile_parse_error(
2880 "Wrong Signature attribute length %u in class file %s",
2881 attribute_length, CHECK);
2882 }
2883 parse_classfile_signature_attribute(CHECK);
2884 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2885 runtime_visible_annotations_length = attribute_length;
2886 runtime_visible_annotations = cfs->get_u1_buffer();
2887 assert(runtime_visible_annotations != NULL, "null visible annotations");
2888 parse_annotations(runtime_visible_annotations,
2889 runtime_visible_annotations_length,
2890 parsed_annotations,
2891 CHECK);
2892 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2893 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2894 runtime_invisible_annotations_length = attribute_length;
2895 runtime_invisible_annotations = cfs->get_u1_buffer();
2896 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2897 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2898 } else if (tag == vmSymbols::tag_enclosing_method()) {
2899 if (parsed_enclosingmethod_attribute) {
2900 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2901 } else {
2902 parsed_enclosingmethod_attribute = true;
2903 }
2904 cfs->guarantee_more(4, CHECK); // class_index, method_index
2905 enclosing_method_class_index = cfs->get_u2_fast();
2906 enclosing_method_method_index = cfs->get_u2_fast();
2907 if (enclosing_method_class_index == 0) {
2908 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2909 }
2910 // Validate the constant pool indices and types
2911 check_property(valid_klass_reference_at(enclosing_method_class_index),
2912 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2913 if (enclosing_method_method_index != 0 &&
2914 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2915 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2916 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2917 }
2918 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2919 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2920 if (parsed_bootstrap_methods_attribute)
2921 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2922 parsed_bootstrap_methods_attribute = true;
2923 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2924 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2925 runtime_visible_type_annotations_length = attribute_length;
2926 runtime_visible_type_annotations = cfs->get_u1_buffer();
2927 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2928 // No need for the VM to parse Type annotations
2929 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2930 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2931 runtime_invisible_type_annotations_length = attribute_length;
2932 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2933 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2934 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2935 } else {
2936 // Unknown attribute
2937 cfs->skip_u1(attribute_length, CHECK);
2938 }
2939 } else {
2940 // Unknown attribute
2941 cfs->skip_u1(attribute_length, CHECK);
2942 }
2943 }
2944 _annotations = assemble_annotations(runtime_visible_annotations,
2945 runtime_visible_annotations_length,
2946 runtime_invisible_annotations,
2947 runtime_invisible_annotations_length,
2948 CHECK);
2949 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
2950 runtime_visible_type_annotations_length,
2951 runtime_invisible_type_annotations,
2952 runtime_invisible_type_annotations_length,
2953 CHECK);
2954
2955 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2956 u2 num_of_classes = parse_classfile_inner_classes_attribute(
2957 inner_classes_attribute_start,
2958 parsed_innerclasses_attribute,
2959 enclosing_method_class_index,
2960 enclosing_method_method_index,
2961 CHECK);
2962 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2963 guarantee_property(
2964 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2965 "Wrong InnerClasses attribute length in class file %s", CHECK);
2966 }
2967 }
2968
2969 if (_max_bootstrap_specifier_index >= 0) {
2970 guarantee_property(parsed_bootstrap_methods_attribute,
2971 "Missing BootstrapMethods attribute in class file %s", CHECK);
2972 }
2973 }
2974
2975 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2976 if (_synthetic_flag)
2977 k->set_is_synthetic();
2978 if (_sourcefile != NULL) {
2979 _sourcefile->increment_refcount();
2980 k->set_source_file_name(_sourcefile);
2981 }
2982 if (_generic_signature != NULL) {
2983 _generic_signature->increment_refcount();
2984 k->set_generic_signature(_generic_signature);
2985 }
2986 if (_sde_buffer != NULL) {
2987 k->set_source_debug_extension(_sde_buffer, _sde_length);
2988 }
2989 }
2990
2991 // Transfer ownership of metadata allocated to the InstanceKlass.
2992 void ClassFileParser::apply_parsed_class_metadata(
2993 instanceKlassHandle this_klass,
2994 int java_fields_count, TRAPS) {
2995 // Assign annotations if needed
2996 if (_annotations != NULL || _type_annotations != NULL ||
2997 _fields_annotations != NULL || _fields_type_annotations != NULL) {
2998 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
2999 annotations->set_class_annotations(_annotations);
3000 annotations->set_class_type_annotations(_type_annotations);
3001 annotations->set_fields_annotations(_fields_annotations);
3002 annotations->set_fields_type_annotations(_fields_type_annotations);
3003 this_klass->set_annotations(annotations);
3004 }
3005
3006 _cp->set_pool_holder(this_klass());
3007 this_klass->set_constants(_cp);
3008 this_klass->set_fields(_fields, java_fields_count);
3009 this_klass->set_methods(_methods);
3010 this_klass->set_inner_classes(_inner_classes);
3011 this_klass->set_local_interfaces(_local_interfaces);
3012 this_klass->set_transitive_interfaces(_transitive_interfaces);
3013
3014 // Clear out these fields so they don't get deallocated by the destructor
3015 clear_class_metadata();
3016 }
3017
3018 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3019 int runtime_visible_annotations_length,
3020 u1* runtime_invisible_annotations,
3021 int runtime_invisible_annotations_length, TRAPS) {
3022 AnnotationArray* annotations = NULL;
3023 if (runtime_visible_annotations != NULL ||
3024 runtime_invisible_annotations != NULL) {
3025 annotations = MetadataFactory::new_array<u1>(_loader_data,
3026 runtime_visible_annotations_length +
3027 runtime_invisible_annotations_length,
3028 CHECK_(annotations));
3029 if (runtime_visible_annotations != NULL) {
3030 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3031 annotations->at_put(i, runtime_visible_annotations[i]);
3032 }
3033 }
3034 if (runtime_invisible_annotations != NULL) {
3035 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3036 int append = runtime_visible_annotations_length+i;
3037 annotations->at_put(append, runtime_invisible_annotations[i]);
3038 }
3039 }
3040 }
3041 return annotations;
3042 }
3043
3044
3045 #ifdef ASSERT
3046 static void parseAndPrintGenericSignatures(
3047 instanceKlassHandle this_klass, TRAPS) {
3048 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise");
3049 ResourceMark rm;
3050
3051 if (this_klass->generic_signature() != NULL) {
3052 using namespace generic;
3053 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK);
3054
3055 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string());
3056 spec->print_on(tty);
3057
3058 for (int i = 0; i < this_klass->methods()->length(); ++i) {
3059 Method* m = this_klass->methods()->at(i);
3060 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec);
3061 Symbol* sig = m->generic_signature();
3062 if (sig == NULL) {
3063 sig = m->signature();
3064 }
3065 tty->print_cr("Parsing %s", sig->as_C_string());
3066 method_spec->print_on(tty);
3067 }
3068 }
3069 }
3070 #endif // def ASSERT
3071
3072
3073 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3074 TRAPS) {
3075 instanceKlassHandle super_klass;
3076 if (super_class_index == 0) {
3077 check_property(_class_name == vmSymbols::java_lang_Object(),
3078 "Invalid superclass index %u in class file %s",
3079 super_class_index,
3080 CHECK_NULL);
3081 } else {
3082 check_property(valid_klass_reference_at(super_class_index),
3083 "Invalid superclass index %u in class file %s",
3084 super_class_index,
3085 CHECK_NULL);
3086 // The class name should be legal because it is checked when parsing constant pool.
3087 // However, make sure it is not an array type.
3088 bool is_array = false;
3089 if (_cp->tag_at(super_class_index).is_klass()) {
3090 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3091 if (_need_verify)
3092 is_array = super_klass->oop_is_array();
3093 } else if (_need_verify) {
3094 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3095 }
3096 if (_need_verify) {
3097 guarantee_property(!is_array,
3098 "Bad superclass name in class file %s", CHECK_NULL);
3099 }
3100 }
3101 return super_klass;
3102 }
3103
3104
3105 // Values needed for oopmap and InstanceKlass creation
3106 class FieldLayoutInfo : public StackObj {
3107 public:
3108 int* nonstatic_oop_offsets;
3109 unsigned int* nonstatic_oop_counts;
3110 unsigned int nonstatic_oop_map_count;
3111 unsigned int total_oop_map_count;
3112 int instance_size;
3113 int nonstatic_field_size;
3114 int static_field_size;
3115 bool has_nonstatic_fields;
3116 };
3117
3118 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3119 void ClassFileParser::layout_fields(Handle class_loader,
3120 FieldAllocationCount* fac,
3121 ClassAnnotationCollector* parsed_annotations,
3122 FieldLayoutInfo* info,
3123 TRAPS) {
3124
3125 // Field size and offset computation
3126 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3127 int next_static_oop_offset;
3128 int next_static_double_offset;
3129 int next_static_word_offset;
3130 int next_static_short_offset;
3131 int next_static_byte_offset;
3132 int next_nonstatic_oop_offset;
3133 int next_nonstatic_double_offset;
3134 int next_nonstatic_word_offset;
3135 int next_nonstatic_short_offset;
3136 int next_nonstatic_byte_offset;
3137 int first_nonstatic_oop_offset;
3138 int next_nonstatic_field_offset;
3139 int next_nonstatic_padded_offset;
3140
3141 // Count the contended fields by type.
3142 //
3143 // We ignore static fields, because @Contended is not supported for them.
3144 // The layout code below will also ignore the static fields.
3145 int nonstatic_contended_count = 0;
3146 FieldAllocationCount fac_contended;
3147 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3148 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3149 if (fs.is_contended()) {
3150 fac_contended.count[atype]++;
3151 if (!fs.access_flags().is_static()) {
3152 nonstatic_contended_count++;
3153 }
3154 }
3155 }
3156
3157
3158 // Calculate the starting byte offsets
3159 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3160 next_static_double_offset = next_static_oop_offset +
3161 ((fac->count[STATIC_OOP]) * heapOopSize);
3162 if ( fac->count[STATIC_DOUBLE] &&
3163 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3164 Universe::field_type_should_be_aligned(T_LONG)) ) {
3165 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3166 }
3167
3168 next_static_word_offset = next_static_double_offset +
3169 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3170 next_static_short_offset = next_static_word_offset +
3171 ((fac->count[STATIC_WORD]) * BytesPerInt);
3172 next_static_byte_offset = next_static_short_offset +
3173 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3174
3175 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3176 nonstatic_field_size * heapOopSize;
3177
3178 next_nonstatic_field_offset = nonstatic_fields_start;
3179
3180 bool is_contended_class = parsed_annotations->is_contended();
3181
3182 // Class is contended, pad before all the fields
3183 if (is_contended_class) {
3184 next_nonstatic_field_offset += ContendedPaddingWidth;
3185 }
3186
3187 // Compute the non-contended fields count.
3188 // The packing code below relies on these counts to determine if some field
3189 // can be squeezed into the alignment gap. Contended fields are obviously
3190 // exempt from that.
3191 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3192 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3193 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3194 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3195 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3196
3197 // Total non-static fields count, including every contended field
3198 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3199 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3200 fac->count[NONSTATIC_OOP];
3201
3202 bool super_has_nonstatic_fields =
3203 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3204 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3205
3206
3207 // Prepare list of oops for oop map generation.
3208 //
3209 // "offset" and "count" lists are describing the set of contiguous oop
3210 // regions. offset[i] is the start of the i-th region, which then has
3211 // count[i] oops following. Before we know how many regions are required,
3212 // we pessimistically allocate the maps to fit all the oops into the
3213 // distinct regions.
3214 //
3215 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3216 // to figure out if we still need to do this.
3217 int* nonstatic_oop_offsets;
3218 unsigned int* nonstatic_oop_counts;
3219 unsigned int nonstatic_oop_map_count = 0;
3220 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3221
3222 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3223 THREAD, int, max_nonstatic_oop_maps);
3224 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3225 THREAD, unsigned int, max_nonstatic_oop_maps);
3226
3227 first_nonstatic_oop_offset = 0; // will be set for first oop field
3228
3229 bool compact_fields = CompactFields;
3230 int allocation_style = FieldsAllocationStyle;
3231 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3232 assert(false, "0 <= FieldsAllocationStyle <= 2");
3233 allocation_style = 1; // Optimistic
3234 }
3235
3236 // The next classes have predefined hard-coded fields offsets
3237 // (see in JavaClasses::compute_hard_coded_offsets()).
3238 // Use default fields allocation order for them.
3239 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3240 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3241 _class_name == vmSymbols::java_lang_Class() ||
3242 _class_name == vmSymbols::java_lang_ClassLoader() ||
3243 _class_name == vmSymbols::java_lang_ref_Reference() ||
3244 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3245 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3246 _class_name == vmSymbols::java_lang_String() ||
3247 _class_name == vmSymbols::java_lang_Throwable() ||
3248 _class_name == vmSymbols::java_lang_Boolean() ||
3249 _class_name == vmSymbols::java_lang_Character() ||
3250 _class_name == vmSymbols::java_lang_Float() ||
3251 _class_name == vmSymbols::java_lang_Double() ||
3252 _class_name == vmSymbols::java_lang_Byte() ||
3253 _class_name == vmSymbols::java_lang_Short() ||
3254 _class_name == vmSymbols::java_lang_Integer() ||
3255 _class_name == vmSymbols::java_lang_Long())) {
3256 allocation_style = 0; // Allocate oops first
3257 compact_fields = false; // Don't compact fields
3258 }
3259
3260 // Rearrange fields for a given allocation style
3261 if( allocation_style == 0 ) {
3262 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3263 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3264 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3265 (nonstatic_oop_count * heapOopSize);
3266 } else if( allocation_style == 1 ) {
3267 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3268 next_nonstatic_double_offset = next_nonstatic_field_offset;
3269 } else if( allocation_style == 2 ) {
3270 // Fields allocation: oops fields in super and sub classes are together.
3271 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3272 _super_klass->nonstatic_oop_map_size() > 0 ) {
3273 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3274 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3275 OopMapBlock* last_map = first_map + map_count - 1;
3276 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3277 if (next_offset == next_nonstatic_field_offset) {
3278 allocation_style = 0; // allocate oops first
3279 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3280 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3281 (nonstatic_oop_count * heapOopSize);
3282 }
3283 }
3284 if( allocation_style == 2 ) {
3285 allocation_style = 1; // allocate oops last
3286 next_nonstatic_double_offset = next_nonstatic_field_offset;
3287 }
3288 } else {
3289 ShouldNotReachHere();
3290 }
3291
3292 int nonstatic_oop_space_count = 0;
3293 int nonstatic_word_space_count = 0;
3294 int nonstatic_short_space_count = 0;
3295 int nonstatic_byte_space_count = 0;
3296 int nonstatic_oop_space_offset;
3297 int nonstatic_word_space_offset;
3298 int nonstatic_short_space_offset;
3299 int nonstatic_byte_space_offset;
3300
3301 // Try to squeeze some of the fields into the gaps due to
3302 // long/double alignment.
3303 if( nonstatic_double_count > 0 ) {
3304 int offset = next_nonstatic_double_offset;
3305 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3306 if( compact_fields && offset != next_nonstatic_double_offset ) {
3307 // Allocate available fields into the gap before double field.
3308 int length = next_nonstatic_double_offset - offset;
3309 assert(length == BytesPerInt, "");
3310 nonstatic_word_space_offset = offset;
3311 if( nonstatic_word_count > 0 ) {
3312 nonstatic_word_count -= 1;
3313 nonstatic_word_space_count = 1; // Only one will fit
3314 length -= BytesPerInt;
3315 offset += BytesPerInt;
3316 }
3317 nonstatic_short_space_offset = offset;
3318 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3319 nonstatic_short_count -= 1;
3320 nonstatic_short_space_count += 1;
3321 length -= BytesPerShort;
3322 offset += BytesPerShort;
3323 }
3324 nonstatic_byte_space_offset = offset;
3325 while( length > 0 && nonstatic_byte_count > 0 ) {
3326 nonstatic_byte_count -= 1;
3327 nonstatic_byte_space_count += 1;
3328 length -= 1;
3329 }
3330 // Allocate oop field in the gap if there are no other fields for that.
3331 nonstatic_oop_space_offset = offset;
3332 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3333 allocation_style != 0 ) { // when oop fields not first
3334 nonstatic_oop_count -= 1;
3335 nonstatic_oop_space_count = 1; // Only one will fit
3336 length -= heapOopSize;
3337 offset += heapOopSize;
3338 }
3339 }
3340 }
3341
3342 next_nonstatic_word_offset = next_nonstatic_double_offset +
3343 (nonstatic_double_count * BytesPerLong);
3344 next_nonstatic_short_offset = next_nonstatic_word_offset +
3345 (nonstatic_word_count * BytesPerInt);
3346 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3347 (nonstatic_short_count * BytesPerShort);
3348 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3349 nonstatic_byte_count;
3350
3351 // let oops jump before padding with this allocation style
3352 if( allocation_style == 1 ) {
3353 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3354 if( nonstatic_oop_count > 0 ) {
3355 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3356 }
3357 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3358 }
3359
3360 // Iterate over fields again and compute correct offsets.
3361 // The field allocation type was temporarily stored in the offset slot.
3362 // oop fields are located before non-oop fields (static and non-static).
3363 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3364
3365 // skip already laid out fields
3366 if (fs.is_offset_set()) continue;
3367
3368 // contended instance fields are handled below
3369 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3370
3371 int real_offset;
3372 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3373
3374 // pack the rest of the fields
3375 switch (atype) {
3376 case STATIC_OOP:
3377 real_offset = next_static_oop_offset;
3378 next_static_oop_offset += heapOopSize;
3379 break;
3380 case STATIC_BYTE:
3381 real_offset = next_static_byte_offset;
3382 next_static_byte_offset += 1;
3383 break;
3384 case STATIC_SHORT:
3385 real_offset = next_static_short_offset;
3386 next_static_short_offset += BytesPerShort;
3387 break;
3388 case STATIC_WORD:
3389 real_offset = next_static_word_offset;
3390 next_static_word_offset += BytesPerInt;
3391 break;
3392 case STATIC_DOUBLE:
3393 real_offset = next_static_double_offset;
3394 next_static_double_offset += BytesPerLong;
3395 break;
3396 case NONSTATIC_OOP:
3397 if( nonstatic_oop_space_count > 0 ) {
3398 real_offset = nonstatic_oop_space_offset;
3399 nonstatic_oop_space_offset += heapOopSize;
3400 nonstatic_oop_space_count -= 1;
3401 } else {
3402 real_offset = next_nonstatic_oop_offset;
3403 next_nonstatic_oop_offset += heapOopSize;
3404 }
3405 // Update oop maps
3406 if( nonstatic_oop_map_count > 0 &&
3407 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3408 real_offset -
3409 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3410 heapOopSize ) {
3411 // Extend current oop map
3412 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3413 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3414 } else {
3415 // Create new oop map
3416 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3417 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3418 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3419 nonstatic_oop_map_count += 1;
3420 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3421 first_nonstatic_oop_offset = real_offset;
3422 }
3423 }
3424 break;
3425 case NONSTATIC_BYTE:
3426 if( nonstatic_byte_space_count > 0 ) {
3427 real_offset = nonstatic_byte_space_offset;
3428 nonstatic_byte_space_offset += 1;
3429 nonstatic_byte_space_count -= 1;
3430 } else {
3431 real_offset = next_nonstatic_byte_offset;
3432 next_nonstatic_byte_offset += 1;
3433 }
3434 break;
3435 case NONSTATIC_SHORT:
3436 if( nonstatic_short_space_count > 0 ) {
3437 real_offset = nonstatic_short_space_offset;
3438 nonstatic_short_space_offset += BytesPerShort;
3439 nonstatic_short_space_count -= 1;
3440 } else {
3441 real_offset = next_nonstatic_short_offset;
3442 next_nonstatic_short_offset += BytesPerShort;
3443 }
3444 break;
3445 case NONSTATIC_WORD:
3446 if( nonstatic_word_space_count > 0 ) {
3447 real_offset = nonstatic_word_space_offset;
3448 nonstatic_word_space_offset += BytesPerInt;
3449 nonstatic_word_space_count -= 1;
3450 } else {
3451 real_offset = next_nonstatic_word_offset;
3452 next_nonstatic_word_offset += BytesPerInt;
3453 }
3454 break;
3455 case NONSTATIC_DOUBLE:
3456 real_offset = next_nonstatic_double_offset;
3457 next_nonstatic_double_offset += BytesPerLong;
3458 break;
3459 default:
3460 ShouldNotReachHere();
3461 }
3462 fs.set_offset(real_offset);
3463 }
3464
3465
3466 // Handle the contended cases.
3467 //
3468 // Each contended field should not intersect the cache line with another contended field.
3469 // In the absence of alignment information, we end up with pessimistically separating
3470 // the fields with full-width padding.
3471 //
3472 // Additionally, this should not break alignment for the fields, so we round the alignment up
3473 // for each field.
3474 if (nonstatic_contended_count > 0) {
3475
3476 // if there is at least one contended field, we need to have pre-padding for them
3477 next_nonstatic_padded_offset += ContendedPaddingWidth;
3478
3479 // collect all contended groups
3480 BitMap bm(_cp->size());
3481 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3482 // skip already laid out fields
3483 if (fs.is_offset_set()) continue;
3484
3485 if (fs.is_contended()) {
3486 bm.set_bit(fs.contended_group());
3487 }
3488 }
3489
3490 int current_group = -1;
3491 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3492
3493 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3494
3495 // skip already laid out fields
3496 if (fs.is_offset_set()) continue;
3497
3498 // skip non-contended fields and fields from different group
3499 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3500
3501 // handle statics below
3502 if (fs.access_flags().is_static()) continue;
3503
3504 int real_offset;
3505 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3506
3507 switch (atype) {
3508 case NONSTATIC_BYTE:
3509 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3510 real_offset = next_nonstatic_padded_offset;
3511 next_nonstatic_padded_offset += 1;
3512 break;
3513
3514 case NONSTATIC_SHORT:
3515 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3516 real_offset = next_nonstatic_padded_offset;
3517 next_nonstatic_padded_offset += BytesPerShort;
3518 break;
3519
3520 case NONSTATIC_WORD:
3521 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3522 real_offset = next_nonstatic_padded_offset;
3523 next_nonstatic_padded_offset += BytesPerInt;
3524 break;
3525
3526 case NONSTATIC_DOUBLE:
3527 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3528 real_offset = next_nonstatic_padded_offset;
3529 next_nonstatic_padded_offset += BytesPerLong;
3530 break;
3531
3532 case NONSTATIC_OOP:
3533 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3534 real_offset = next_nonstatic_padded_offset;
3535 next_nonstatic_padded_offset += heapOopSize;
3536
3537 // Create new oop map
3538 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3539 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3540 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3541 nonstatic_oop_map_count += 1;
3542 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3543 first_nonstatic_oop_offset = real_offset;
3544 }
3545 break;
3546
3547 default:
3548 ShouldNotReachHere();
3549 }
3550
3551 if (fs.contended_group() == 0) {
3552 // Contended group defines the equivalence class over the fields:
3553 // the fields within the same contended group are not inter-padded.
3554 // The only exception is default group, which does not incur the
3555 // equivalence, and so requires intra-padding.
3556 next_nonstatic_padded_offset += ContendedPaddingWidth;
3557 }
3558
3559 fs.set_offset(real_offset);
3560 } // for
3561
3562 // Start laying out the next group.
3563 // Note that this will effectively pad the last group in the back;
3564 // this is expected to alleviate memory contention effects for
3565 // subclass fields and/or adjacent object.
3566 // If this was the default group, the padding is already in place.
3567 if (current_group != 0) {
3568 next_nonstatic_padded_offset += ContendedPaddingWidth;
3569 }
3570 }
3571
3572 // handle static fields
3573 }
3574
3575 // Entire class is contended, pad in the back.
3576 // This helps to alleviate memory contention effects for subclass fields
3577 // and/or adjacent object.
3578 if (is_contended_class) {
3579 next_nonstatic_padded_offset += ContendedPaddingWidth;
3580 }
3581
3582 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3583
3584 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3585 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3586 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3587
3588 int static_field_size = (static_fields_end -
3589 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3590 nonstatic_field_size = nonstatic_field_size +
3591 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3592
3593 int instance_size = align_object_size(instance_end / wordSize);
3594
3595 assert(instance_size == align_object_size(align_size_up(
3596 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3597 wordSize) / wordSize), "consistent layout helper value");
3598
3599 // Invariant: nonstatic_field end/start should only change if there are
3600 // nonstatic fields in the class, or if the class is contended. We compare
3601 // against the non-aligned value, so that end alignment will not fail the
3602 // assert without actually having the fields.
3603 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3604 is_contended_class ||
3605 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3606
3607 // Number of non-static oop map blocks allocated at end of klass.
3608 const unsigned int total_oop_map_count =
3609 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3610 first_nonstatic_oop_offset);
3611
3612 #ifndef PRODUCT
3613 if (PrintFieldLayout) {
3614 print_field_layout(_class_name,
3615 _fields,
3616 _cp,
3617 instance_size,
3618 nonstatic_fields_start,
3619 nonstatic_fields_end,
3620 static_fields_end);
3621 }
3622
3623 #endif
3624 // Pass back information needed for InstanceKlass creation
3625 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3626 info->nonstatic_oop_counts = nonstatic_oop_counts;
3627 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3628 info->total_oop_map_count = total_oop_map_count;
3629 info->instance_size = instance_size;
3630 info->static_field_size = static_field_size;
3631 info->nonstatic_field_size = nonstatic_field_size;
3632 info->has_nonstatic_fields = has_nonstatic_fields;
3633 }
3634
3635
3636 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3637 ClassLoaderData* loader_data,
3638 Handle protection_domain,
3639 KlassHandle host_klass,
3640 GrowableArray<Handle>* cp_patches,
3641 TempNewSymbol& parsed_name,
3642 bool verify,
3643 TRAPS) {
3644
3645 // When a retransformable agent is attached, JVMTI caches the
3646 // class bytes that existed before the first retransformation.
3647 // If RedefineClasses() was used before the retransformable
3648 // agent attached, then the cached class bytes may not be the
3649 // original class bytes.
3650 unsigned char *cached_class_file_bytes = NULL;
3651 jint cached_class_file_length;
3652 Handle class_loader(THREAD, loader_data->class_loader());
3653 bool has_default_methods = false;
3654 ResourceMark rm(THREAD);
3655
3656 ClassFileStream* cfs = stream();
3657 // Timing
3658 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3659 JavaThread* jt = (JavaThread*) THREAD;
3660
3661 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3662 ClassLoader::perf_class_parse_selftime(),
3663 NULL,
3664 jt->get_thread_stat()->perf_recursion_counts_addr(),
3665 jt->get_thread_stat()->perf_timers_addr(),
3666 PerfClassTraceTime::PARSE_CLASS);
3667
3668 init_parsed_class_attributes(loader_data);
3669
3670 if (JvmtiExport::should_post_class_file_load_hook()) {
3671 // Get the cached class file bytes (if any) from the class that
3672 // is being redefined or retransformed. We use jvmti_thread_state()
3673 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3674 // a JvmtiThreadState any earlier than necessary. This will help
3675 // avoid the bug described by 7126851.
3676 JvmtiThreadState *state = jt->jvmti_thread_state();
3677 if (state != NULL) {
3678 KlassHandle *h_class_being_redefined =
3679 state->get_class_being_redefined();
3680 if (h_class_being_redefined != NULL) {
3681 instanceKlassHandle ikh_class_being_redefined =
3682 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3683 cached_class_file_bytes =
3684 ikh_class_being_redefined->get_cached_class_file_bytes();
3685 cached_class_file_length =
3686 ikh_class_being_redefined->get_cached_class_file_len();
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,
3695 &cached_class_file_bytes,
3696 &cached_class_file_length);
3697
3698 if (ptr != cfs->buffer()) {
3699 // JVMTI agent has modified class file data.
3700 // Set new class file stream using JVMTI agent modified
3701 // class file data.
3702 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3703 set_stream(cfs);
3704 }
3705 }
3706
3707 _host_klass = host_klass;
3708 _cp_patches = cp_patches;
3709
3710 instanceKlassHandle nullHandle;
3711
3712 // Figure out whether we can skip format checking (matching classic VM behavior)
3713 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3714
3715 // Set the verify flag in stream
3716 cfs->set_verify(_need_verify);
3717
3718 // Save the class file name for easier error message printing.
3719 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3720
3721 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3722 // Magic value
3723 u4 magic = cfs->get_u4_fast();
3724 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3725 "Incompatible magic value %u in class file %s",
3726 magic, CHECK_(nullHandle));
3727
3728 // Version numbers
3729 u2 minor_version = cfs->get_u2_fast();
3730 u2 major_version = cfs->get_u2_fast();
3731
3732 // Check version numbers - we check this even with verifier off
3733 if (!is_supported_version(major_version, minor_version)) {
3734 if (name == NULL) {
3735 Exceptions::fthrow(
3736 THREAD_AND_LOCATION,
3737 vmSymbols::java_lang_UnsupportedClassVersionError(),
3738 "Unsupported major.minor version %u.%u",
3739 major_version,
3740 minor_version);
3741 } else {
3742 ResourceMark rm(THREAD);
3743 Exceptions::fthrow(
3744 THREAD_AND_LOCATION,
3745 vmSymbols::java_lang_UnsupportedClassVersionError(),
3746 "%s : Unsupported major.minor version %u.%u",
3747 name->as_C_string(),
3748 major_version,
3749 minor_version);
3750 }
3751 return nullHandle;
3752 }
3753
3754 _major_version = major_version;
3755 _minor_version = minor_version;
3756
3757
3758 // Check if verification needs to be relaxed for this class file
3759 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3760 _relax_verify = Verifier::relax_verify_for(class_loader());
3761
3762 // Constant pool
3763 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3764
3765 int cp_size = cp->length();
3766
3767 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3768
3769 // Access flags
3770 AccessFlags access_flags;
3771 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3772
3773 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3774 // Set abstract bit for old class files for backward compatibility
3775 flags |= JVM_ACC_ABSTRACT;
3776 }
3777 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3778 access_flags.set_flags(flags);
3779
3780 // This class and superclass
3781 u2 this_class_index = cfs->get_u2_fast();
3782 check_property(
3783 valid_cp_range(this_class_index, cp_size) &&
3784 cp->tag_at(this_class_index).is_unresolved_klass(),
3785 "Invalid this class index %u in constant pool in class file %s",
3786 this_class_index, CHECK_(nullHandle));
3787
3788 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3789 assert(class_name != NULL, "class_name can't be null");
3790
3791 // It's important to set parsed_name *before* resolving the super class.
3792 // (it's used for cleanup by the caller if parsing fails)
3793 parsed_name = class_name;
3794 // parsed_name is returned and can be used if there's an error, so add to
3795 // its reference count. Caller will decrement the refcount.
3796 parsed_name->increment_refcount();
3797
3798 // Update _class_name which could be null previously to be class_name
3799 _class_name = class_name;
3800
3801 // Don't need to check whether this class name is legal or not.
3802 // It has been checked when constant pool is parsed.
3803 // However, make sure it is not an array type.
3804 if (_need_verify) {
3805 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3806 "Bad class name in class file %s",
3807 CHECK_(nullHandle));
3808 }
3809
3810 Klass* preserve_this_klass; // for storing result across HandleMark
3811
3812 // release all handles when parsing is done
3813 { HandleMark hm(THREAD);
3814
3815 // Checks if name in class file matches requested name
3816 if (name != NULL && class_name != name) {
3817 ResourceMark rm(THREAD);
3818 Exceptions::fthrow(
3819 THREAD_AND_LOCATION,
3820 vmSymbols::java_lang_NoClassDefFoundError(),
3821 "%s (wrong name: %s)",
3822 name->as_C_string(),
3823 class_name->as_C_string()
3824 );
3825 return nullHandle;
3826 }
3827
3828 if (TraceClassLoadingPreorder) {
3829 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3830 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3831 tty->print_cr("]");
3832 }
3833
3834 u2 super_class_index = cfs->get_u2_fast();
3835 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3836 CHECK_NULL);
3837
3838 // Interfaces
3839 u2 itfs_len = cfs->get_u2_fast();
3840 Array<Klass*>* local_interfaces =
3841 parse_interfaces(itfs_len, protection_domain, _class_name,
3842 &has_default_methods, CHECK_(nullHandle));
3843
3844 u2 java_fields_count = 0;
3845 // Fields (offsets are filled in later)
3846 FieldAllocationCount fac;
3847 Array<u2>* fields = parse_fields(class_name,
3848 access_flags.is_interface(),
3849 &fac, &java_fields_count,
3850 CHECK_(nullHandle));
3851 // Methods
3852 bool has_final_method = false;
3853 AccessFlags promoted_flags;
3854 promoted_flags.set_flags(0);
3855 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3856 &promoted_flags,
3857 &has_final_method,
3858 &has_default_methods,
3859 CHECK_(nullHandle));
3860
3861 // Additional attributes
3862 ClassAnnotationCollector parsed_annotations;
3863 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3864
3865 // Make sure this is the end of class file stream
3866 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3867
3868 // We check super class after class file is parsed and format is checked
3869 if (super_class_index > 0 && super_klass.is_null()) {
3870 Symbol* sk = cp->klass_name_at(super_class_index);
3871 if (access_flags.is_interface()) {
3872 // Before attempting to resolve the superclass, check for class format
3873 // errors not checked yet.
3874 guarantee_property(sk == vmSymbols::java_lang_Object(),
3875 "Interfaces must have java.lang.Object as superclass in class file %s",
3876 CHECK_(nullHandle));
3877 }
3878 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3879 class_loader,
3880 protection_domain,
3881 true,
3882 CHECK_(nullHandle));
3883
3884 KlassHandle kh (THREAD, k);
3885 super_klass = instanceKlassHandle(THREAD, kh());
3886 }
3887 if (super_klass.not_null()) {
3888
3889 if (super_klass->has_default_methods()) {
3890 has_default_methods = true;
3891 }
3892
3893 if (super_klass->is_interface()) {
3894 ResourceMark rm(THREAD);
3895 Exceptions::fthrow(
3896 THREAD_AND_LOCATION,
3897 vmSymbols::java_lang_IncompatibleClassChangeError(),
3898 "class %s has interface %s as super class",
3899 class_name->as_klass_external_name(),
3900 super_klass->external_name()
3901 );
3902 return nullHandle;
3903 }
3904 // Make sure super class is not final
3905 if (super_klass->is_final()) {
3906 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3907 }
3908 }
3909
3910 // save super klass for error handling.
3911 _super_klass = super_klass;
3912
3913 // Compute the transitive list of all unique interfaces implemented by this class
3914 _transitive_interfaces =
3915 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3916
3917 // sort methods
3918 intArray* method_ordering = sort_methods(methods);
3919
3920 // promote flags from parse_methods() to the klass' flags
3921 access_flags.add_promoted_flags(promoted_flags.as_int());
3922
3923 // Size of Java vtable (in words)
3924 int vtable_size = 0;
3925 int itable_size = 0;
3926 int num_miranda_methods = 0;
3927
3928 GrowableArray<Method*> all_mirandas(20);
3929
3930 klassVtable::compute_vtable_size_and_num_mirandas(
3931 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3932 access_flags, class_loader, class_name, local_interfaces,
3933 CHECK_(nullHandle));
3934
3935 // Size of Java itable (in words)
3936 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
3937
3938 FieldLayoutInfo info;
3939 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
3940
3941 int total_oop_map_size2 =
3942 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
3943
3944 // Compute reference type
3945 ReferenceType rt;
3946 if (super_klass() == NULL) {
3947 rt = REF_NONE;
3948 } else {
3949 rt = super_klass->reference_type();
3950 }
3951
3952 // We can now create the basic Klass* for this klass
3953 _klass = InstanceKlass::allocate_instance_klass(loader_data,
3954 vtable_size,
3955 itable_size,
3956 info.static_field_size,
3957 total_oop_map_size2,
3958 rt,
3959 access_flags,
3960 name,
3961 super_klass(),
3962 !host_klass.is_null(),
3963 CHECK_(nullHandle));
3964 instanceKlassHandle this_klass (THREAD, _klass);
3965
3966 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
3967 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
3968 "sanity");
3969
3970 // Fill in information already parsed
3971 this_klass->set_should_verify_class(verify);
3972 jint lh = Klass::instance_layout_helper(info.instance_size, false);
3973 this_klass->set_layout_helper(lh);
3974 assert(this_klass->oop_is_instance(), "layout is correct");
3975 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
3976 // Not yet: supers are done below to support the new subtype-checking fields
3977 //this_klass->set_super(super_klass());
3978 this_klass->set_class_loader_data(loader_data);
3979 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
3980 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
3981 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3982
3983 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
3984
3985 if (has_final_method) {
3986 this_klass->set_has_final_method();
3987 }
3988 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
3989 // The InstanceKlass::_methods_jmethod_ids cache and the
3990 // InstanceKlass::_methods_cached_itable_indices cache are
3991 // both managed on the assumption that the initial cache
3992 // size is equal to the number of methods in the class. If
3993 // that changes, then InstanceKlass::idnum_can_increment()
3994 // has to be changed accordingly.
3995 this_klass->set_initial_method_idnum(methods->length());
3996 this_klass->set_name(cp->klass_name_at(this_class_index));
3997 if (is_anonymous()) // I am well known to myself
3998 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3999
4000 this_klass->set_minor_version(minor_version);
4001 this_klass->set_major_version(major_version);
4002 this_klass->set_has_default_methods(has_default_methods);
4003
4004 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4005 // (We used to do this lazily, but now we query it in Rewriter,
4006 // which is eagerly done for every method, so we might as well do it now,
4007 // when everything is fresh in memory.)
4008 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4009 for (int j = 0; j < methods->length(); j++) {
4010 methods->at(j)->init_intrinsic_id();
4011 }
4012 }
4013
4014 if (cached_class_file_bytes != NULL) {
4015 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4016 this_klass->set_cached_class_file(cached_class_file_bytes,
4017 cached_class_file_length);
4018 }
4019
4020 // Fill in field values obtained by parse_classfile_attributes
4021 if (parsed_annotations.has_any_annotations())
4022 parsed_annotations.apply_to(this_klass);
4023 apply_parsed_class_attributes(this_klass);
4024
4025 // Miranda methods
4026 if ((num_miranda_methods > 0) ||
4027 // if this class introduced new miranda methods or
4028 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4029 // super class exists and this class inherited miranda methods
4030 ) {
4031 this_klass->set_has_miranda_methods(); // then set a flag
4032 }
4033
4034 // Fill in information needed to compute superclasses.
4035 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4036
4037 // Initialize itable offset tables
4038 klassItable::setup_itable_offset_table(this_klass);
4039
4040 // Compute transitive closure of interfaces this class implements
4041 // Do final class setup
4042 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4043
4044 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4045 set_precomputed_flags(this_klass);
4046
4047 // reinitialize modifiers, using the InnerClasses attribute
4048 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4049 this_klass->set_modifier_flags(computed_modifiers);
4050
4051 // check if this class can access its super class
4052 check_super_class_access(this_klass, CHECK_(nullHandle));
4053
4054 // check if this class can access its superinterfaces
4055 check_super_interface_access(this_klass, CHECK_(nullHandle));
4056
4057 // check if this class overrides any final method
4058 check_final_method_override(this_klass, CHECK_(nullHandle));
4059
4060 // check that if this class is an interface then it doesn't have static methods
4061 if (this_klass->is_interface()) {
4062 /* An interface in a JAVA 8 classfile can be static */
4063 if (_major_version < JAVA_8_VERSION) {
4064 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4065 }
4066 }
4067
4068 // Allocate mirror and initialize static fields
4069 java_lang_Class::create_mirror(this_klass, protection_domain, CHECK_(nullHandle));
4070
4071
4072 #ifdef ASSERT
4073 if (ParseAllGenericSignatures) {
4074 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle));
4075 }
4076 #endif
4077
4078 // Generate any default methods - default methods are interface methods
4079 // that have a default implementation. This is new with Lambda project.
4080 if (has_default_methods && !access_flags.is_interface() &&
4081 local_interfaces->length() > 0) {
4082 DefaultMethods::generate_default_methods(
4083 this_klass(), &all_mirandas, CHECK_(nullHandle));
4084 }
4085
4086 // Update the loader_data graph.
4087 record_defined_class_dependencies(this_klass, CHECK_NULL);
4088
4089 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4090 false /* not shared class */);
4091
4092 if (TraceClassLoading) {
4093 ResourceMark rm;
4094 // print in a single call to reduce interleaving of output
4095 if (cfs->source() != NULL) {
4096 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4097 cfs->source());
4098 } else if (class_loader.is_null()) {
4099 if (THREAD->is_Java_thread()) {
4100 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4101 tty->print("[Loaded %s by instance of %s]\n",
4102 this_klass->external_name(),
4103 InstanceKlass::cast(caller)->external_name());
4104 } else {
4105 tty->print("[Loaded %s]\n", this_klass->external_name());
4106 }
4107 } else {
4108 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4109 InstanceKlass::cast(class_loader->klass())->external_name());
4110 }
4111 }
4112
4113 if (TraceClassResolution) {
4114 ResourceMark rm;
4115 // print out the superclass.
4116 const char * from = this_klass()->external_name();
4117 if (this_klass->java_super() != NULL) {
4118 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4119 }
4120 // print out each of the interface classes referred to by this class.
4121 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4122 if (local_interfaces != NULL) {
4123 int length = local_interfaces->length();
4124 for (int i = 0; i < length; i++) {
4125 Klass* k = local_interfaces->at(i);
4126 InstanceKlass* to_class = InstanceKlass::cast(k);
4127 const char * to = to_class->external_name();
4128 tty->print("RESOLVE %s %s (interface)\n", from, to);
4129 }
4130 }
4131 }
4132
4133 // preserve result across HandleMark
4134 preserve_this_klass = this_klass();
4135 }
4136
4137 // Create new handle outside HandleMark (might be needed for
4138 // Extended Class Redefinition)
4139 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4140 debug_only(this_klass->verify();)
4141
4142 // Clear class if no error has occurred so destructor doesn't deallocate it
4143 _klass = NULL;
4144 return this_klass;
4145 }
4146
4147 // Destructor to clean up if there's an error
4148 ClassFileParser::~ClassFileParser() {
4149 MetadataFactory::free_metadata(_loader_data, _cp);
4150 MetadataFactory::free_array<u2>(_loader_data, _fields);
4151
4152 // Free methods
4153 InstanceKlass::deallocate_methods(_loader_data, _methods);
4154
4155 // beware of the Universe::empty_blah_array!!
4156 if (_inner_classes != Universe::the_empty_short_array()) {
4157 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4158 }
4159
4160 // Free interfaces
4161 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4162 _local_interfaces, _transitive_interfaces);
4163
4164 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4165 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4166 Annotations::free_contents(_loader_data, _fields_annotations);
4167 Annotations::free_contents(_loader_data, _fields_type_annotations);
4168
4169 clear_class_metadata();
4170
4171 // deallocate the klass if already created.
4172 MetadataFactory::free_metadata(_loader_data, _klass);
4173 _klass = NULL;
4174 }
4175
4176 void ClassFileParser::print_field_layout(Symbol* name,
4177 Array<u2>* fields,
4178 constantPoolHandle cp,
4179 int instance_size,
4180 int instance_fields_start,
4181 int instance_fields_end,
4182 int static_fields_end) {
4183 tty->print("%s: field layout\n", name->as_klass_external_name());
4184 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4185 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4186 if (!fs.access_flags().is_static()) {
4187 tty->print(" @%3d \"%s\" %s\n",
4188 fs.offset(),
4189 fs.name()->as_klass_external_name(),
4190 fs.signature()->as_klass_external_name());
4191 }
4192 }
4193 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4194 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4195 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4196 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4197 if (fs.access_flags().is_static()) {
4198 tty->print(" @%3d \"%s\" %s\n",
4199 fs.offset(),
4200 fs.name()->as_klass_external_name(),
4201 fs.signature()->as_klass_external_name());
4202 }
4203 }
4204 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4205 tty->print("\n");
4206 }
4207
4208 unsigned int
4209 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4210 unsigned int nonstatic_oop_map_count,
4211 int first_nonstatic_oop_offset) {
4212 unsigned int map_count =
4213 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4214 if (nonstatic_oop_map_count > 0) {
4215 // We have oops to add to map
4216 if (map_count == 0) {
4217 map_count = nonstatic_oop_map_count;
4218 } else {
4219 // Check whether we should add a new map block or whether the last one can
4220 // be extended
4221 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4222 OopMapBlock* const last_map = first_map + map_count - 1;
4223
4224 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4225 if (next_offset == first_nonstatic_oop_offset) {
4226 // There is no gap bettwen superklass's last oop field and first
4227 // local oop field, merge maps.
4228 nonstatic_oop_map_count -= 1;
4229 } else {
4230 // Superklass didn't end with a oop field, add extra maps
4231 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4232 }
4233 map_count += nonstatic_oop_map_count;
4234 }
4235 }
4236 return map_count;
4237 }
4238
4239
4240 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4241 unsigned int nonstatic_oop_map_count,
4242 int* nonstatic_oop_offsets,
4243 unsigned int* nonstatic_oop_counts) {
4244 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4245 const InstanceKlass* const super = k->superklass();
4246 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4247 if (super_count > 0) {
4248 // Copy maps from superklass
4249 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4250 for (unsigned int i = 0; i < super_count; ++i) {
4251 *this_oop_map++ = *super_oop_map++;
4252 }
4253 }
4254
4255 if (nonstatic_oop_map_count > 0) {
4256 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4257 // The counts differ because there is no gap between superklass's last oop
4258 // field and the first local oop field. Extend the last oop map copied
4259 // from the superklass instead of creating new one.
4260 nonstatic_oop_map_count--;
4261 nonstatic_oop_offsets++;
4262 this_oop_map--;
4263 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4264 this_oop_map++;
4265 }
4266
4267 // Add new map blocks, fill them
4268 while (nonstatic_oop_map_count-- > 0) {
4269 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4270 this_oop_map->set_count(*nonstatic_oop_counts++);
4271 this_oop_map++;
4272 }
4273 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4274 this_oop_map, "sanity");
4275 }
4276 }
4277
4278
4279 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4280 Klass* super = k->super();
4281
4282 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4283 // in which case we don't have to register objects as finalizable
4284 if (!_has_empty_finalizer) {
4285 if (_has_finalizer ||
4286 (super != NULL && super->has_finalizer())) {
4287 k->set_has_finalizer();
4288 }
4289 }
4290
4291 #ifdef ASSERT
4292 bool f = false;
4293 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4294 vmSymbols::void_method_signature());
4295 if (m != NULL && !m->is_empty_method()) {
4296 f = true;
4297 }
4298 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4299 #endif
4300
4301 // Check if this klass supports the java.lang.Cloneable interface
4302 if (SystemDictionary::Cloneable_klass_loaded()) {
4303 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4304 k->set_is_cloneable();
4305 }
4306 }
4307
4308 // Check if this klass has a vanilla default constructor
4309 if (super == NULL) {
4310 // java.lang.Object has empty default constructor
4311 k->set_has_vanilla_constructor();
4312 } else {
4313 if (super->has_vanilla_constructor() &&
4314 _has_vanilla_constructor) {
4315 k->set_has_vanilla_constructor();
4316 }
4317 #ifdef ASSERT
4318 bool v = false;
4319 if (super->has_vanilla_constructor()) {
4320 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4321 ), vmSymbols::void_method_signature());
4322 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4323 v = true;
4324 }
4325 }
4326 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4327 #endif
4328 }
4329
4330 // If it cannot be fast-path allocated, set a bit in the layout helper.
4331 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4332 assert(k->size_helper() > 0, "layout_helper is initialized");
4333 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4334 || k->is_abstract() || k->is_interface()
4335 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4336 || k->size_helper() >= FastAllocateSizeLimit) {
4337 // Forbid fast-path allocation.
4338 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4339 k->set_layout_helper(lh);
4340 }
4341 }
4342
4343 // Attach super classes and interface classes to class loader data
4344 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4345 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4346 if (defining_loader_data->is_the_null_class_loader_data()) {
4347 // Dependencies to null class loader data are implicit.
4348 return;
4349 } else {
4350 // add super class dependency
4351 Klass* super = defined_klass->super();
4352 if (super != NULL) {
4353 defining_loader_data->record_dependency(super, CHECK);
4354 }
4355
4356 // add super interface dependencies
4357 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4358 if (local_interfaces != NULL) {
4359 int length = local_interfaces->length();
4360 for (int i = 0; i < length; i++) {
4361 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4362 }
4363 }
4364 }
4365 }
4366
4367 // utility methods for appending an array with check for duplicates
4368
4369 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4370 // iterate over new interfaces
4371 for (int i = 0; i < ifs->length(); i++) {
4372 Klass* e = ifs->at(i);
4373 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4374 // add new interface
4375 result->append_if_missing(e);
4376 }
4377 }
4378
4379 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4380 instanceKlassHandle super,
4381 Array<Klass*>* local_ifs, TRAPS) {
4382 // Compute maximum size for transitive interfaces
4383 int max_transitive_size = 0;
4384 int super_size = 0;
4385 // Add superclass transitive interfaces size
4386 if (super.not_null()) {
4387 super_size = super->transitive_interfaces()->length();
4388 max_transitive_size += super_size;
4389 }
4390 // Add local interfaces' super interfaces
4391 int local_size = local_ifs->length();
4392 for (int i = 0; i < local_size; i++) {
4393 Klass* l = local_ifs->at(i);
4394 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4395 }
4396 // Finally add local interfaces
4397 max_transitive_size += local_size;
4398 // Construct array
4399 if (max_transitive_size == 0) {
4400 // no interfaces, use canonicalized array
4401 return Universe::the_empty_klass_array();
4402 } else if (max_transitive_size == super_size) {
4403 // no new local interfaces added, share superklass' transitive interface array
4404 return super->transitive_interfaces();
4405 } else if (max_transitive_size == local_size) {
4406 // only local interfaces added, share local interface array
4407 return local_ifs;
4408 } else {
4409 ResourceMark rm;
4410 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4411
4412 // Copy down from superclass
4413 if (super.not_null()) {
4414 append_interfaces(result, super->transitive_interfaces());
4415 }
4416
4417 // Copy down from local interfaces' superinterfaces
4418 for (int i = 0; i < local_ifs->length(); i++) {
4419 Klass* l = local_ifs->at(i);
4420 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4421 }
4422 // Finally add local interfaces
4423 append_interfaces(result, local_ifs);
4424
4425 // length will be less than the max_transitive_size if duplicates were removed
4426 int length = result->length();
4427 assert(length <= max_transitive_size, "just checking");
4428 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4429 for (int i = 0; i < length; i++) {
4430 Klass* e = result->at(i);
4431 assert(e != NULL, "just checking");
4432 new_result->at_put(i, e);
4433 }
4434 return new_result;
4435 }
4436 }
4437
4438 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4439 Klass* super = this_klass->super();
4440 if ((super != NULL) &&
4441 (!Reflection::verify_class_access(this_klass(), super, false))) {
4442 ResourceMark rm(THREAD);
4443 Exceptions::fthrow(
4444 THREAD_AND_LOCATION,
4445 vmSymbols::java_lang_IllegalAccessError(),
4446 "class %s cannot access its superclass %s",
4447 this_klass->external_name(),
4448 InstanceKlass::cast(super)->external_name()
4449 );
4450 return;
4451 }
4452 }
4453
4454
4455 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4456 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4457 int lng = local_interfaces->length();
4458 for (int i = lng - 1; i >= 0; i--) {
4459 Klass* k = local_interfaces->at(i);
4460 assert (k != NULL && k->is_interface(), "invalid interface");
4461 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4462 ResourceMark rm(THREAD);
4463 Exceptions::fthrow(
4464 THREAD_AND_LOCATION,
4465 vmSymbols::java_lang_IllegalAccessError(),
4466 "class %s cannot access its superinterface %s",
4467 this_klass->external_name(),
4468 InstanceKlass::cast(k)->external_name()
4469 );
4470 return;
4471 }
4472 }
4473 }
4474
4475
4476 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4477 Array<Method*>* methods = this_klass->methods();
4478 int num_methods = methods->length();
4479
4480 // go thru each method and check if it overrides a final method
4481 for (int index = 0; index < num_methods; index++) {
4482 Method* m = methods->at(index);
4483
4484 // skip private, static and <init> methods
4485 if ((!m->is_private()) &&
4486 (!m->is_static()) &&
4487 (m->name() != vmSymbols::object_initializer_name())) {
4488
4489 Symbol* name = m->name();
4490 Symbol* signature = m->signature();
4491 Klass* k = this_klass->super();
4492 Method* super_m = NULL;
4493 while (k != NULL) {
4494 // skip supers that don't have final methods.
4495 if (k->has_final_method()) {
4496 // lookup a matching method in the super class hierarchy
4497 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4498 if (super_m == NULL) {
4499 break; // didn't find any match; get out
4500 }
4501
4502 if (super_m->is_final() &&
4503 // matching method in super is final
4504 (Reflection::verify_field_access(this_klass(),
4505 super_m->method_holder(),
4506 super_m->method_holder(),
4507 super_m->access_flags(), false))
4508 // this class can access super final method and therefore override
4509 ) {
4510 ResourceMark rm(THREAD);
4511 Exceptions::fthrow(
4512 THREAD_AND_LOCATION,
4513 vmSymbols::java_lang_VerifyError(),
4514 "class %s overrides final method %s.%s",
4515 this_klass->external_name(),
4516 name->as_C_string(),
4517 signature->as_C_string()
4518 );
4519 return;
4520 }
4521
4522 // continue to look from super_m's holder's super.
4523 k = super_m->method_holder()->super();
4524 continue;
4525 }
4526
4527 k = k->super();
4528 }
4529 }
4530 }
4531 }
4532
4533
4534 // assumes that this_klass is an interface
4535 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4536 assert(this_klass->is_interface(), "not an interface");
4537 Array<Method*>* methods = this_klass->methods();
4538 int num_methods = methods->length();
4539
4540 for (int index = 0; index < num_methods; index++) {
4541 Method* m = methods->at(index);
4542 // if m is static and not the init method, throw a verify error
4543 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4544 ResourceMark rm(THREAD);
4545 Exceptions::fthrow(
4546 THREAD_AND_LOCATION,
4547 vmSymbols::java_lang_VerifyError(),
4548 "Illegal static method %s in interface %s",
4549 m->name()->as_C_string(),
4550 this_klass->external_name()
4551 );
4552 return;
4553 }
4554 }
4555 }
4556
4557 // utility methods for format checking
4558
4559 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4560 if (!_need_verify) { return; }
4561
4562 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4563 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4564 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4565 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4566 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4567 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4568 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4569
4570 if ((is_abstract && is_final) ||
4571 (is_interface && !is_abstract) ||
4572 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4573 (!is_interface && major_gte_15 && is_annotation)) {
4574 ResourceMark rm(THREAD);
4575 Exceptions::fthrow(
4576 THREAD_AND_LOCATION,
4577 vmSymbols::java_lang_ClassFormatError(),
4578 "Illegal class modifiers in class %s: 0x%X",
4579 _class_name->as_C_string(), flags
4580 );
4581 return;
4582 }
4583 }
4584
4585 bool ClassFileParser::has_illegal_visibility(jint flags) {
4586 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4587 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4588 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4589
4590 return ((is_public && is_protected) ||
4591 (is_public && is_private) ||
4592 (is_protected && is_private));
4593 }
4594
4595 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4596 u2 max_version =
4597 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4598 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4599 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4600 (major <= max_version) &&
4601 ((major != max_version) ||
4602 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4603 }
4604
4605 void ClassFileParser::verify_legal_field_modifiers(
4606 jint flags, bool is_interface, TRAPS) {
4607 if (!_need_verify) { return; }
4608
4609 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4610 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4611 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4612 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4613 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4614 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4615 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4616 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4617 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4618
4619 bool is_illegal = false;
4620
4621 if (is_interface) {
4622 if (!is_public || !is_static || !is_final || is_private ||
4623 is_protected || is_volatile || is_transient ||
4624 (major_gte_15 && is_enum)) {
4625 is_illegal = true;
4626 }
4627 } else { // not interface
4628 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4629 is_illegal = true;
4630 }
4631 }
4632
4633 if (is_illegal) {
4634 ResourceMark rm(THREAD);
4635 Exceptions::fthrow(
4636 THREAD_AND_LOCATION,
4637 vmSymbols::java_lang_ClassFormatError(),
4638 "Illegal field modifiers in class %s: 0x%X",
4639 _class_name->as_C_string(), flags);
4640 return;
4641 }
4642 }
4643
4644 void ClassFileParser::verify_legal_method_modifiers(
4645 jint flags, bool is_interface, Symbol* name, TRAPS) {
4646 if (!_need_verify) { return; }
4647
4648 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4649 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4650 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4651 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4652 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4653 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4654 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4655 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4656 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4657 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4658 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4659 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4660 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4661
4662 bool is_illegal = false;
4663
4664 if (is_interface) {
4665 if (major_gte_8) {
4666 // Class file version is JAVA_8_VERSION or later Methods of
4667 // interfaces may set any of the flags except ACC_PROTECTED,
4668 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4669 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4670 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4671 (is_native || is_protected || is_final || is_synchronized) ||
4672 // If a specific method of a class or interface has its
4673 // ACC_ABSTRACT flag set, it must not have any of its
4674 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4675 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4676 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4677 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4678 (is_abstract && (is_private || is_static || is_strict))) {
4679 is_illegal = true;
4680 }
4681 } else if (major_gte_15) {
4682 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4683 if (!is_public || is_static || is_final || is_synchronized ||
4684 is_native || !is_abstract || is_strict) {
4685 is_illegal = true;
4686 }
4687 } else {
4688 // Class file version is pre-JAVA_1_5_VERSION
4689 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4690 is_illegal = true;
4691 }
4692 }
4693 } else { // not interface
4694 if (is_initializer) {
4695 if (is_static || is_final || is_synchronized || is_native ||
4696 is_abstract || (major_gte_15 && is_bridge)) {
4697 is_illegal = true;
4698 }
4699 } else { // not initializer
4700 if (is_abstract) {
4701 if ((is_final || is_native || is_private || is_static ||
4702 (major_gte_15 && (is_synchronized || is_strict)))) {
4703 is_illegal = true;
4704 }
4705 }
4706 if (has_illegal_visibility(flags)) {
4707 is_illegal = true;
4708 }
4709 }
4710 }
4711
4712 if (is_illegal) {
4713 ResourceMark rm(THREAD);
4714 Exceptions::fthrow(
4715 THREAD_AND_LOCATION,
4716 vmSymbols::java_lang_ClassFormatError(),
4717 "Method %s in class %s has illegal modifiers: 0x%X",
4718 name->as_C_string(), _class_name->as_C_string(), flags);
4719 return;
4720 }
4721 }
4722
4723 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4724 assert(_need_verify, "only called when _need_verify is true");
4725 int i = 0;
4726 int count = length >> 2;
4727 for (int k=0; k<count; k++) {
4728 unsigned char b0 = buffer[i];
4729 unsigned char b1 = buffer[i+1];
4730 unsigned char b2 = buffer[i+2];
4731 unsigned char b3 = buffer[i+3];
4732 // For an unsigned char v,
4733 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4734 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4735 unsigned char res = b0 | b0 - 1 |
4736 b1 | b1 - 1 |
4737 b2 | b2 - 1 |
4738 b3 | b3 - 1;
4739 if (res >= 128) break;
4740 i += 4;
4741 }
4742 for(; i < length; i++) {
4743 unsigned short c;
4744 // no embedded zeros
4745 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4746 if(buffer[i] < 128) {
4747 continue;
4748 }
4749 if ((i + 5) < length) { // see if it's legal supplementary character
4750 if (UTF8::is_supplementary_character(&buffer[i])) {
4751 c = UTF8::get_supplementary_character(&buffer[i]);
4752 i += 5;
4753 continue;
4754 }
4755 }
4756 switch (buffer[i] >> 4) {
4757 default: break;
4758 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4759 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4760 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4761 c = (buffer[i] & 0x1F) << 6;
4762 i++;
4763 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4764 c += buffer[i] & 0x3F;
4765 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4766 // for classes with major > 47, c must a null or a character in its shortest form
4767 break;
4768 }
4769 }
4770 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4771 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4772 c = (buffer[i] & 0xF) << 12;
4773 i += 2;
4774 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4775 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4776 if (_major_version <= 47 || c >= 0x800) {
4777 // for classes with major > 47, c must be in its shortest form
4778 break;
4779 }
4780 }
4781 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4782 } // end of switch
4783 } // end of for
4784 }
4785
4786 // Checks if name is a legal class name.
4787 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4788 if (!_need_verify || _relax_verify) { return; }
4789
4790 char buf[fixed_buffer_size];
4791 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4792 unsigned int length = name->utf8_length();
4793 bool legal = false;
4794
4795 if (length > 0) {
4796 char* p;
4797 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4798 p = skip_over_field_signature(bytes, false, length, CHECK);
4799 legal = (p != NULL) && ((p - bytes) == (int)length);
4800 } else if (_major_version < JAVA_1_5_VERSION) {
4801 if (bytes[0] != '<') {
4802 p = skip_over_field_name(bytes, true, length);
4803 legal = (p != NULL) && ((p - bytes) == (int)length);
4804 }
4805 } else {
4806 // 4900761: relax the constraints based on JSR202 spec
4807 // Class names may be drawn from the entire Unicode character set.
4808 // Identifiers between '/' must be unqualified names.
4809 // The utf8 string has been verified when parsing cpool entries.
4810 legal = verify_unqualified_name(bytes, length, LegalClass);
4811 }
4812 }
4813 if (!legal) {
4814 ResourceMark rm(THREAD);
4815 Exceptions::fthrow(
4816 THREAD_AND_LOCATION,
4817 vmSymbols::java_lang_ClassFormatError(),
4818 "Illegal class name \"%s\" in class file %s", bytes,
4819 _class_name->as_C_string()
4820 );
4821 return;
4822 }
4823 }
4824
4825 // Checks if name is a legal field name.
4826 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4827 if (!_need_verify || _relax_verify) { return; }
4828
4829 char buf[fixed_buffer_size];
4830 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4831 unsigned int length = name->utf8_length();
4832 bool legal = false;
4833
4834 if (length > 0) {
4835 if (_major_version < JAVA_1_5_VERSION) {
4836 if (bytes[0] != '<') {
4837 char* p = skip_over_field_name(bytes, false, length);
4838 legal = (p != NULL) && ((p - bytes) == (int)length);
4839 }
4840 } else {
4841 // 4881221: relax the constraints based on JSR202 spec
4842 legal = verify_unqualified_name(bytes, length, LegalField);
4843 }
4844 }
4845
4846 if (!legal) {
4847 ResourceMark rm(THREAD);
4848 Exceptions::fthrow(
4849 THREAD_AND_LOCATION,
4850 vmSymbols::java_lang_ClassFormatError(),
4851 "Illegal field name \"%s\" in class %s", bytes,
4852 _class_name->as_C_string()
4853 );
4854 return;
4855 }
4856 }
4857
4858 // Checks if name is a legal method name.
4859 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4860 if (!_need_verify || _relax_verify) { return; }
4861
4862 assert(name != NULL, "method name is null");
4863 char buf[fixed_buffer_size];
4864 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4865 unsigned int length = name->utf8_length();
4866 bool legal = false;
4867
4868 if (length > 0) {
4869 if (bytes[0] == '<') {
4870 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4871 legal = true;
4872 }
4873 } else if (_major_version < JAVA_1_5_VERSION) {
4874 char* p;
4875 p = skip_over_field_name(bytes, false, length);
4876 legal = (p != NULL) && ((p - bytes) == (int)length);
4877 } else {
4878 // 4881221: relax the constraints based on JSR202 spec
4879 legal = verify_unqualified_name(bytes, length, LegalMethod);
4880 }
4881 }
4882
4883 if (!legal) {
4884 ResourceMark rm(THREAD);
4885 Exceptions::fthrow(
4886 THREAD_AND_LOCATION,
4887 vmSymbols::java_lang_ClassFormatError(),
4888 "Illegal method name \"%s\" in class %s", bytes,
4889 _class_name->as_C_string()
4890 );
4891 return;
4892 }
4893 }
4894
4895
4896 // Checks if signature is a legal field signature.
4897 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4898 if (!_need_verify) { return; }
4899
4900 char buf[fixed_buffer_size];
4901 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4902 unsigned int length = signature->utf8_length();
4903 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4904
4905 if (p == NULL || (p - bytes) != (int)length) {
4906 throwIllegalSignature("Field", name, signature, CHECK);
4907 }
4908 }
4909
4910 // Checks if signature is a legal method signature.
4911 // Returns number of parameters
4912 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4913 if (!_need_verify) {
4914 // make sure caller's args_size will be less than 0 even for non-static
4915 // method so it will be recomputed in compute_size_of_parameters().
4916 return -2;
4917 }
4918
4919 unsigned int args_size = 0;
4920 char buf[fixed_buffer_size];
4921 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4922 unsigned int length = signature->utf8_length();
4923 char* nextp;
4924
4925 // The first character must be a '('
4926 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4927 length--;
4928 // Skip over legal field signatures
4929 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4930 while ((length > 0) && (nextp != NULL)) {
4931 args_size++;
4932 if (p[0] == 'J' || p[0] == 'D') {
4933 args_size++;
4934 }
4935 length -= nextp - p;
4936 p = nextp;
4937 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4938 }
4939 // The first non-signature thing better be a ')'
4940 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4941 length--;
4942 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4943 // All internal methods must return void
4944 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4945 return args_size;
4946 }
4947 } else {
4948 // Now we better just have a return value
4949 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4950 if (nextp && ((int)length == (nextp - p))) {
4951 return args_size;
4952 }
4953 }
4954 }
4955 }
4956 // Report error
4957 throwIllegalSignature("Method", name, signature, CHECK_0);
4958 return 0;
4959 }
4960
4961
4962 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4963 // Method names also may not contain the characters '<' or '>', unless <init>
4964 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4965 // method. Because these names have been checked as special cases before
4966 // calling this method in verify_legal_method_name.
4967 bool ClassFileParser::verify_unqualified_name(
4968 char* name, unsigned int length, int type) {
4969 jchar ch;
4970
4971 for (char* p = name; p != name + length; ) {
4972 ch = *p;
4973 if (ch < 128) {
4974 p++;
4975 if (ch == '.' || ch == ';' || ch == '[' ) {
4976 return false; // do not permit '.', ';', or '['
4977 }
4978 if (type != LegalClass && ch == '/') {
4979 return false; // do not permit '/' unless it's class name
4980 }
4981 if (type == LegalMethod && (ch == '<' || ch == '>')) {
4982 return false; // do not permit '<' or '>' in method names
4983 }
4984 } else {
4985 char* tmp_p = UTF8::next(p, &ch);
4986 p = tmp_p;
4987 }
4988 }
4989 return true;
4990 }
4991
4992
4993 // Take pointer to a string. Skip over the longest part of the string that could
4994 // be taken as a fieldname. Allow '/' if slash_ok is true.
4995 // Return a pointer to just past the fieldname.
4996 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4997 // being true, we saw consecutive slashes (meaning we were looking for a
4998 // qualified path but found something that was badly-formed).
4999 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5000 char* p;
5001 jchar ch;
5002 jboolean last_is_slash = false;
5003 jboolean not_first_ch = false;
5004
5005 for (p = name; p != name + length; not_first_ch = true) {
5006 char* old_p = p;
5007 ch = *p;
5008 if (ch < 128) {
5009 p++;
5010 // quick check for ascii
5011 if ((ch >= 'a' && ch <= 'z') ||
5012 (ch >= 'A' && ch <= 'Z') ||
5013 (ch == '_' || ch == '$') ||
5014 (not_first_ch && ch >= '0' && ch <= '9')) {
5015 last_is_slash = false;
5016 continue;
5017 }
5018 if (slash_ok && ch == '/') {
5019 if (last_is_slash) {
5020 return NULL; // Don't permit consecutive slashes
5021 }
5022 last_is_slash = true;
5023 continue;
5024 }
5025 } else {
5026 jint unicode_ch;
5027 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5028 p = tmp_p;
5029 last_is_slash = false;
5030 // Check if ch is Java identifier start or is Java identifier part
5031 // 4672820: call java.lang.Character methods directly without generating separate tables.
5032 EXCEPTION_MARK;
5033 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5034
5035 // return value
5036 JavaValue result(T_BOOLEAN);
5037 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5038 JavaCallArguments args;
5039 args.push_int(unicode_ch);
5040
5041 // public static boolean isJavaIdentifierStart(char ch);
5042 JavaCalls::call_static(&result,
5043 klass,
5044 vmSymbols::isJavaIdentifierStart_name(),
5045 vmSymbols::int_bool_signature(),
5046 &args,
5047 THREAD);
5048
5049 if (HAS_PENDING_EXCEPTION) {
5050 CLEAR_PENDING_EXCEPTION;
5051 return 0;
5052 }
5053 if (result.get_jboolean()) {
5054 continue;
5055 }
5056
5057 if (not_first_ch) {
5058 // public static boolean isJavaIdentifierPart(char ch);
5059 JavaCalls::call_static(&result,
5060 klass,
5061 vmSymbols::isJavaIdentifierPart_name(),
5062 vmSymbols::int_bool_signature(),
5063 &args,
5064 THREAD);
5065
5066 if (HAS_PENDING_EXCEPTION) {
5067 CLEAR_PENDING_EXCEPTION;
5068 return 0;
5069 }
5070
5071 if (result.get_jboolean()) {
5072 continue;
5073 }
5074 }
5075 }
5076 return (not_first_ch) ? old_p : NULL;
5077 }
5078 return (not_first_ch) ? p : NULL;
5079 }
5080
5081
5082 // Take pointer to a string. Skip over the longest part of the string that could
5083 // be taken as a field signature. Allow "void" if void_ok.
5084 // Return a pointer to just past the signature.
5085 // Return NULL if no legal signature is found.
5086 char* ClassFileParser::skip_over_field_signature(char* signature,
5087 bool void_ok,
5088 unsigned int length,
5089 TRAPS) {
5090 unsigned int array_dim = 0;
5091 while (length > 0) {
5092 switch (signature[0]) {
5093 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5094 case JVM_SIGNATURE_BOOLEAN:
5095 case JVM_SIGNATURE_BYTE:
5096 case JVM_SIGNATURE_CHAR:
5097 case JVM_SIGNATURE_SHORT:
5098 case JVM_SIGNATURE_INT:
5099 case JVM_SIGNATURE_FLOAT:
5100 case JVM_SIGNATURE_LONG:
5101 case JVM_SIGNATURE_DOUBLE:
5102 return signature + 1;
5103 case JVM_SIGNATURE_CLASS: {
5104 if (_major_version < JAVA_1_5_VERSION) {
5105 // Skip over the class name if one is there
5106 char* p = skip_over_field_name(signature + 1, true, --length);
5107
5108 // The next character better be a semicolon
5109 if (p && (p - signature) > 1 && p[0] == ';') {
5110 return p + 1;
5111 }
5112 } else {
5113 // 4900761: For class version > 48, any unicode is allowed in class name.
5114 length--;
5115 signature++;
5116 while (length > 0 && signature[0] != ';') {
5117 if (signature[0] == '.') {
5118 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5119 }
5120 length--;
5121 signature++;
5122 }
5123 if (signature[0] == ';') { return signature + 1; }
5124 }
5125
5126 return NULL;
5127 }
5128 case JVM_SIGNATURE_ARRAY:
5129 array_dim++;
5130 if (array_dim > 255) {
5131 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5132 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5133 }
5134 // The rest of what's there better be a legal signature
5135 signature++;
5136 length--;
5137 void_ok = false;
5138 break;
5139
5140 default:
5141 return NULL;
5142 }
5143 }
5144 return NULL;
5145 }