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