1 /*
2 * Copyright (c) 1997, 2015, 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.inline.hpp"
29 #include "classfile/defaultMethods.hpp"
30 #include "classfile/javaClasses.inline.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/verificationType.hpp"
34 #include "classfile/verifier.hpp"
35 #include "classfile/vmSymbols.hpp"
36 #include "gc/shared/gcLocker.hpp"
37 #include "memory/allocation.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/oopFactory.hpp"
40 #include "memory/referenceType.hpp"
41 #include "memory/resourceArea.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/exceptions.hpp"
63 #include "utilities/globalDefinitions.hpp"
64 #include "utilities/macros.hpp"
65 #include "utilities/ostream.hpp"
66 #include "utilities/resourceHash.hpp"
67 #if INCLUDE_CDS
68 #include "classfile/systemDictionaryShared.hpp"
69 #endif
70
71 // We generally try to create the oops directly when parsing, rather than
72 // allocating temporary data structures and copying the bytes twice. A
73 // temporary area is only needed when parsing utf8 entries in the constant
74 // pool and when parsing line number tables.
75
76 // We add assert in debug mode when class format is not checked.
77
78 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
79 #define JAVA_MIN_SUPPORTED_VERSION 45
80 #define JAVA_MAX_SUPPORTED_VERSION 52
81 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
82
83 // Used for two backward compatibility reasons:
84 // - to check for new additions to the class file format in JDK1.5
85 // - to check for bug fixes in the format checker in JDK1.5
86 #define JAVA_1_5_VERSION 49
87
88 // Used for backward compatibility reasons:
89 // - to check for javac bug fixes that happened after 1.5
90 // - also used as the max version when running in jdk6
91 #define JAVA_6_VERSION 50
92
93 // Used for backward compatibility reasons:
94 // - to check NameAndType_info signatures more aggressively
95 #define JAVA_7_VERSION 51
96
97 // Extension method support.
98 #define JAVA_8_VERSION 52
99
100 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
101 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
102 // this function (_current can be allocated in a register, with scalar
103 // replacement of aggregates). The _current pointer is copied back to
104 // stream() when this function returns. DON'T call another method within
105 // this method that uses stream().
106 ClassFileStream* cfs0 = stream();
107 ClassFileStream cfs1 = *cfs0;
108 ClassFileStream* cfs = &cfs1;
109 #ifdef ASSERT
110 assert(cfs->allocated_on_stack(),"should be local");
111 u1* old_current = cfs0->current();
112 #endif
113 Handle class_loader(THREAD, _loader_data->class_loader());
114
115 // Used for batching symbol allocations.
116 const char* names[SymbolTable::symbol_alloc_batch_size];
117 int lengths[SymbolTable::symbol_alloc_batch_size];
118 int indices[SymbolTable::symbol_alloc_batch_size];
119 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
120 int names_count = 0;
121
122 // parsing Index 0 is unused
123 for (int index = 1; index < length; index++) {
124 // Each of the following case guarantees one more byte in the stream
125 // for the following tag or the access_flags following constant pool,
126 // so we don't need bounds-check for reading tag.
127 u1 tag = cfs->get_u1_fast();
128 switch (tag) {
129 case JVM_CONSTANT_Class :
130 {
131 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
132 u2 name_index = cfs->get_u2_fast();
133 _cp->klass_index_at_put(index, name_index);
134 }
135 break;
136 case JVM_CONSTANT_Fieldref :
137 {
138 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
139 u2 class_index = cfs->get_u2_fast();
140 u2 name_and_type_index = cfs->get_u2_fast();
141 _cp->field_at_put(index, class_index, name_and_type_index);
142 }
143 break;
144 case JVM_CONSTANT_Methodref :
145 {
146 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
147 u2 class_index = cfs->get_u2_fast();
148 u2 name_and_type_index = cfs->get_u2_fast();
149 _cp->method_at_put(index, class_index, name_and_type_index);
150 }
151 break;
152 case JVM_CONSTANT_InterfaceMethodref :
153 {
154 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
155 u2 class_index = cfs->get_u2_fast();
156 u2 name_and_type_index = cfs->get_u2_fast();
157 _cp->interface_method_at_put(index, class_index, name_and_type_index);
158 }
159 break;
160 case JVM_CONSTANT_String :
161 {
162 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
163 u2 string_index = cfs->get_u2_fast();
164 _cp->string_index_at_put(index, string_index);
165 }
166 break;
167 case JVM_CONSTANT_MethodHandle :
168 case JVM_CONSTANT_MethodType :
169 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
170 classfile_parse_error(
171 "Class file version does not support constant tag %u in class file %s",
172 tag, CHECK);
173 }
174 if (tag == JVM_CONSTANT_MethodHandle) {
175 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
176 u1 ref_kind = cfs->get_u1_fast();
177 u2 method_index = cfs->get_u2_fast();
178 _cp->method_handle_index_at_put(index, ref_kind, method_index);
179 } else if (tag == JVM_CONSTANT_MethodType) {
180 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
181 u2 signature_index = cfs->get_u2_fast();
182 _cp->method_type_index_at_put(index, signature_index);
183 } else {
184 ShouldNotReachHere();
185 }
186 break;
187 case JVM_CONSTANT_InvokeDynamic :
188 {
189 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
190 classfile_parse_error(
191 "Class file version does not support constant tag %u in class file %s",
192 tag, CHECK);
193 }
194 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
195 u2 bootstrap_specifier_index = cfs->get_u2_fast();
196 u2 name_and_type_index = cfs->get_u2_fast();
197 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
198 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
199 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
200 }
201 break;
202 case JVM_CONSTANT_Integer :
203 {
204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
205 u4 bytes = cfs->get_u4_fast();
206 _cp->int_at_put(index, (jint) bytes);
207 }
208 break;
209 case JVM_CONSTANT_Float :
210 {
211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
212 u4 bytes = cfs->get_u4_fast();
213 _cp->float_at_put(index, *(jfloat*)&bytes);
214 }
215 break;
216 case JVM_CONSTANT_Long :
217 // A mangled type might cause you to overrun allocated memory
218 guarantee_property(index+1 < length,
219 "Invalid constant pool entry %u in class file %s",
220 index, CHECK);
221 {
222 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
223 u8 bytes = cfs->get_u8_fast();
224 _cp->long_at_put(index, bytes);
225 }
226 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
227 break;
228 case JVM_CONSTANT_Double :
229 // A mangled type might cause you to overrun allocated memory
230 guarantee_property(index+1 < length,
231 "Invalid constant pool entry %u in class file %s",
232 index, CHECK);
233 {
234 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
235 u8 bytes = cfs->get_u8_fast();
236 _cp->double_at_put(index, *(jdouble*)&bytes);
237 }
238 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
239 break;
240 case JVM_CONSTANT_NameAndType :
241 {
242 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
243 u2 name_index = cfs->get_u2_fast();
244 u2 signature_index = cfs->get_u2_fast();
245 _cp->name_and_type_at_put(index, name_index, signature_index);
246 }
247 break;
248 case JVM_CONSTANT_Utf8 :
249 {
250 cfs->guarantee_more(2, CHECK); // utf8_length
251 u2 utf8_length = cfs->get_u2_fast();
252 u1* utf8_buffer = cfs->get_u1_buffer();
253 assert(utf8_buffer != NULL, "null utf8 buffer");
254 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
255 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
256 cfs->skip_u1_fast(utf8_length);
257
258 // Before storing the symbol, make sure it's legal
259 if (_need_verify) {
260 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
261 }
262
263 if (has_cp_patch_at(index)) {
264 Handle patch = clear_cp_patch_at(index);
265 guarantee_property(java_lang_String::is_instance(patch()),
266 "Illegal utf8 patch at %d in class file %s",
267 index, CHECK);
268 char* str = java_lang_String::as_utf8_string(patch());
269 // (could use java_lang_String::as_symbol instead, but might as well batch them)
270 utf8_buffer = (u1*) str;
271 utf8_length = (int) strlen(str);
272 }
273
274 unsigned int hash;
275 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
276 if (result == NULL) {
277 names[names_count] = (char*)utf8_buffer;
278 lengths[names_count] = utf8_length;
279 indices[names_count] = index;
280 hashValues[names_count++] = hash;
281 if (names_count == SymbolTable::symbol_alloc_batch_size) {
282 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
283 names_count = 0;
284 }
285 } else {
286 _cp->symbol_at_put(index, result);
287 }
288 }
289 break;
290 default:
291 classfile_parse_error(
292 "Unknown constant tag %u in class file %s", tag, CHECK);
293 break;
294 }
295 }
296
297 // Allocate the remaining symbols
298 if (names_count > 0) {
299 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
300 }
301
302 // Copy _current pointer of local copy back to stream().
303 #ifdef ASSERT
304 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
305 #endif
306 cfs0->set_current(cfs1.current());
307 }
308
309 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
310
311 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
312 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
313 return cp->symbol_at(index);
314 else
315 return NULL;
316 }
317
318 PRAGMA_DIAG_PUSH
319 PRAGMA_FORMAT_NONLITERAL_IGNORED
320 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) {
321 ResourceMark rm(THREAD);
322 fatal(err_msg(msg, _class_name->as_C_string()));
323 }
324
325 void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) {
326 ResourceMark rm(THREAD);
327 fatal(err_msg(msg, index, _class_name->as_C_string()));
328 }
329 PRAGMA_DIAG_POP
330
331 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
332 ClassFileStream* cfs = stream();
333 constantPoolHandle nullHandle;
334
335 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
336 u2 length = cfs->get_u2_fast();
337 guarantee_property(
338 length >= 1, "Illegal constant pool size %u in class file %s",
339 length, CHECK_(nullHandle));
340 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
341 CHECK_(nullHandle));
342 _cp = constant_pool; // save in case of errors
343 constantPoolHandle cp (THREAD, constant_pool);
344
345 // parsing constant pool entries
346 parse_constant_pool_entries(length, CHECK_(nullHandle));
347
348 int index = 1; // declared outside of loops for portability
349
350 // first verification pass - validate cross references and fixup class and string constants
351 for (index = 1; index < length; index++) { // Index 0 is unused
352 jbyte tag = cp->tag_at(index).value();
353 switch (tag) {
354 case JVM_CONSTANT_Class :
355 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
356 break;
357 case JVM_CONSTANT_Fieldref :
358 // fall through
359 case JVM_CONSTANT_Methodref :
360 // fall through
361 case JVM_CONSTANT_InterfaceMethodref : {
362 if (!_need_verify) break;
363 int klass_ref_index = cp->klass_ref_index_at(index);
364 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
365 check_property(valid_klass_reference_at(klass_ref_index),
366 "Invalid constant pool index %u in class file %s",
367 klass_ref_index,
368 CHECK_(nullHandle));
369 check_property(valid_cp_range(name_and_type_ref_index, length) &&
370 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
371 "Invalid constant pool index %u in class file %s",
372 name_and_type_ref_index,
373 CHECK_(nullHandle));
374 break;
375 }
376 case JVM_CONSTANT_String :
377 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
378 break;
379 case JVM_CONSTANT_Integer :
380 break;
381 case JVM_CONSTANT_Float :
382 break;
383 case JVM_CONSTANT_Long :
384 case JVM_CONSTANT_Double :
385 index++;
386 check_property(
387 (index < length && cp->tag_at(index).is_invalid()),
388 "Improper constant pool long/double index %u in class file %s",
389 index, CHECK_(nullHandle));
390 break;
391 case JVM_CONSTANT_NameAndType : {
392 if (!_need_verify) break;
393 int name_ref_index = cp->name_ref_index_at(index);
394 int signature_ref_index = cp->signature_ref_index_at(index);
395 check_property(valid_symbol_at(name_ref_index),
396 "Invalid constant pool index %u in class file %s",
397 name_ref_index, CHECK_(nullHandle));
398 check_property(valid_symbol_at(signature_ref_index),
399 "Invalid constant pool index %u in class file %s",
400 signature_ref_index, CHECK_(nullHandle));
401 break;
402 }
403 case JVM_CONSTANT_Utf8 :
404 break;
405 case JVM_CONSTANT_UnresolvedClass : // fall-through
406 case JVM_CONSTANT_UnresolvedClassInError:
407 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
408 break;
409 case JVM_CONSTANT_ClassIndex :
410 {
411 int class_index = cp->klass_index_at(index);
412 check_property(valid_symbol_at(class_index),
413 "Invalid constant pool index %u in class file %s",
414 class_index, CHECK_(nullHandle));
415 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
416 }
417 break;
418 case JVM_CONSTANT_StringIndex :
419 {
420 int string_index = cp->string_index_at(index);
421 check_property(valid_symbol_at(string_index),
422 "Invalid constant pool index %u in class file %s",
423 string_index, CHECK_(nullHandle));
424 Symbol* sym = cp->symbol_at(string_index);
425 cp->unresolved_string_at_put(index, sym);
426 }
427 break;
428 case JVM_CONSTANT_MethodHandle :
429 {
430 int ref_index = cp->method_handle_index_at(index);
431 check_property(
432 valid_cp_range(ref_index, length),
433 "Invalid constant pool index %u in class file %s",
434 ref_index, CHECK_(nullHandle));
435 constantTag tag = cp->tag_at(ref_index);
436 int ref_kind = cp->method_handle_ref_kind_at(index);
437 switch (ref_kind) {
438 case JVM_REF_getField:
439 case JVM_REF_getStatic:
440 case JVM_REF_putField:
441 case JVM_REF_putStatic:
442 check_property(
443 tag.is_field(),
444 "Invalid constant pool index %u in class file %s (not a field)",
445 ref_index, CHECK_(nullHandle));
446 break;
447 case JVM_REF_invokeVirtual:
448 case JVM_REF_newInvokeSpecial:
449 check_property(
450 tag.is_method(),
451 "Invalid constant pool index %u in class file %s (not a method)",
452 ref_index, CHECK_(nullHandle));
453 break;
454 case JVM_REF_invokeStatic:
455 case JVM_REF_invokeSpecial:
456 check_property(tag.is_method() ||
457 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
458 "Invalid constant pool index %u in class file %s (not a method)",
459 ref_index, CHECK_(nullHandle));
460 break;
461 case JVM_REF_invokeInterface:
462 check_property(
463 tag.is_interface_method(),
464 "Invalid constant pool index %u in class file %s (not an interface method)",
465 ref_index, CHECK_(nullHandle));
466 break;
467 default:
468 classfile_parse_error(
469 "Bad method handle kind at constant pool index %u in class file %s",
470 index, CHECK_(nullHandle));
471 }
472 // Keep the ref_index unchanged. It will be indirected at link-time.
473 }
474 break;
475 case JVM_CONSTANT_MethodType :
476 {
477 int ref_index = cp->method_type_index_at(index);
478 check_property(valid_symbol_at(ref_index),
479 "Invalid constant pool index %u in class file %s",
480 ref_index, CHECK_(nullHandle));
481 }
482 break;
483 case JVM_CONSTANT_InvokeDynamic :
484 {
485 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
486 check_property(valid_cp_range(name_and_type_ref_index, length) &&
487 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
488 "Invalid constant pool index %u in class file %s",
489 name_and_type_ref_index,
490 CHECK_(nullHandle));
491 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
492 break;
493 }
494 default:
495 fatal(err_msg("bad constant pool tag value %u",
496 cp->tag_at(index).value()));
497 ShouldNotReachHere();
498 break;
499 } // end of switch
500 } // end of for
501
502 if (_cp_patches != NULL) {
503 // need to treat this_class specially...
504 int this_class_index;
505 {
506 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
507 u1* mark = cfs->current();
508 u2 flags = cfs->get_u2_fast();
509 this_class_index = cfs->get_u2_fast();
510 cfs->set_current(mark); // revert to mark
511 }
512
513 for (index = 1; index < length; index++) { // Index 0 is unused
514 if (has_cp_patch_at(index)) {
515 guarantee_property(index != this_class_index,
516 "Illegal constant pool patch to self at %d in class file %s",
517 index, CHECK_(nullHandle));
518 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
519 }
520 }
521 }
522
523 if (!_need_verify) {
524 return cp;
525 }
526
527 // second verification pass - checks the strings are of the right format.
528 // but not yet to the other entries
529 for (index = 1; index < length; index++) {
530 jbyte tag = cp->tag_at(index).value();
531 switch (tag) {
532 case JVM_CONSTANT_UnresolvedClass: {
533 Symbol* class_name = cp->klass_name_at(index);
534 // check the name, even if _cp_patches will overwrite it
535 verify_legal_class_name(class_name, CHECK_(nullHandle));
536 break;
537 }
538 case JVM_CONSTANT_NameAndType: {
539 if (_need_verify && _major_version >= JAVA_7_VERSION) {
540 int sig_index = cp->signature_ref_index_at(index);
541 int name_index = cp->name_ref_index_at(index);
542 Symbol* name = cp->symbol_at(name_index);
543 Symbol* sig = cp->symbol_at(sig_index);
544 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
545 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
546 } else {
547 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
548 }
549 }
550 break;
551 }
552 case JVM_CONSTANT_InvokeDynamic:
553 case JVM_CONSTANT_Fieldref:
554 case JVM_CONSTANT_Methodref:
555 case JVM_CONSTANT_InterfaceMethodref: {
556 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
557 // already verified to be utf8
558 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
559 // already verified to be utf8
560 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
561 Symbol* name = cp->symbol_at(name_ref_index);
562 Symbol* signature = cp->symbol_at(signature_ref_index);
563 if (tag == JVM_CONSTANT_Fieldref) {
564 verify_legal_field_name(name, CHECK_(nullHandle));
565 if (_need_verify && _major_version >= JAVA_7_VERSION) {
566 // Signature is verified above, when iterating NameAndType_info.
567 // Need only to be sure it's the right type.
568 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
569 throwIllegalSignature(
570 "Field", name, signature, CHECK_(nullHandle));
571 }
572 } else {
573 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
574 }
575 } else {
576 verify_legal_method_name(name, CHECK_(nullHandle));
577 if (_need_verify && _major_version >= JAVA_7_VERSION) {
578 // Signature is verified above, when iterating NameAndType_info.
579 // Need only to be sure it's the right type.
580 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
581 throwIllegalSignature(
582 "Method", name, signature, CHECK_(nullHandle));
583 }
584 } else {
585 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
586 }
587 if (tag == JVM_CONSTANT_Methodref) {
588 // 4509014: If a class method name begins with '<', it must be "<init>".
589 assert(name != NULL, "method name in constant pool is null");
590 unsigned int name_len = name->utf8_length();
591 assert(name_len > 0, "bad method name"); // already verified as legal name
592 if (name->byte_at(0) == '<') {
593 if (name != vmSymbols::object_initializer_name()) {
594 classfile_parse_error(
595 "Bad method name at constant pool index %u in class file %s",
596 name_ref_index, CHECK_(nullHandle));
597 }
598 }
599 }
600 }
601 break;
602 }
603 case JVM_CONSTANT_MethodHandle: {
604 int ref_index = cp->method_handle_index_at(index);
605 int ref_kind = cp->method_handle_ref_kind_at(index);
606 switch (ref_kind) {
607 case JVM_REF_invokeVirtual:
608 case JVM_REF_invokeStatic:
609 case JVM_REF_invokeSpecial:
610 case JVM_REF_newInvokeSpecial:
611 {
612 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
613 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
614 Symbol* name = cp->symbol_at(name_ref_index);
615 if (ref_kind == JVM_REF_newInvokeSpecial) {
616 if (name != vmSymbols::object_initializer_name()) {
617 classfile_parse_error(
618 "Bad constructor name at constant pool index %u in class file %s",
619 name_ref_index, CHECK_(nullHandle));
620 }
621 } else {
622 if (name == vmSymbols::object_initializer_name()) {
623 classfile_parse_error(
624 "Bad method name at constant pool index %u in class file %s",
625 name_ref_index, CHECK_(nullHandle));
626 }
627 }
628 }
629 break;
630 // Other ref_kinds are already fully checked in previous pass.
631 }
632 break;
633 }
634 case JVM_CONSTANT_MethodType: {
635 Symbol* no_name = vmSymbols::type_name(); // place holder
636 Symbol* signature = cp->method_type_signature_at(index);
637 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
638 break;
639 }
640 case JVM_CONSTANT_Utf8: {
641 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
642 }
643 } // end of switch
644 } // end of for
645
646 return cp;
647 }
648
649
650 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
651 BasicType patch_type = T_VOID;
652
653 switch (cp->tag_at(index).value()) {
654
655 case JVM_CONSTANT_UnresolvedClass :
656 // Patching a class means pre-resolving it.
657 // The name in the constant pool is ignored.
658 if (java_lang_Class::is_instance(patch())) {
659 guarantee_property(!java_lang_Class::is_primitive(patch()),
660 "Illegal class patch at %d in class file %s",
661 index, CHECK);
662 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
663 } else {
664 guarantee_property(java_lang_String::is_instance(patch()),
665 "Illegal class patch at %d in class file %s",
666 index, CHECK);
667 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
668 cp->unresolved_klass_at_put(index, name);
669 }
670 break;
671
672 case JVM_CONSTANT_String :
673 // skip this patch and don't clear it. Needs the oop array for resolved
674 // references to be created first.
675 return;
676
677 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
678 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
679 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
680 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
681 patch_prim:
682 {
683 jvalue value;
684 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
685 guarantee_property(value_type == patch_type,
686 "Illegal primitive patch at %d in class file %s",
687 index, CHECK);
688 switch (value_type) {
689 case T_INT: cp->int_at_put(index, value.i); break;
690 case T_FLOAT: cp->float_at_put(index, value.f); break;
691 case T_LONG: cp->long_at_put(index, value.j); break;
692 case T_DOUBLE: cp->double_at_put(index, value.d); break;
693 default: assert(false, "");
694 }
695 }
696 break;
697
698 default:
699 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
700 guarantee_property(!has_cp_patch_at(index),
701 "Illegal unexpected patch at %d in class file %s",
702 index, CHECK);
703 return;
704 }
705
706 // On fall-through, mark the patch as used.
707 clear_cp_patch_at(index);
708 }
709
710
711 class NameSigHash: public ResourceObj {
712 public:
713 Symbol* _name; // name
714 Symbol* _sig; // signature
715 NameSigHash* _next; // Next entry in hash table
716 };
717
718
719 #define HASH_ROW_SIZE 256
720
721 unsigned int hash(Symbol* name, Symbol* sig) {
722 unsigned int raw_hash = 0;
723 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
724 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
725
726 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
727 }
728
729
730 void initialize_hashtable(NameSigHash** table) {
731 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
732 }
733
734 // Return false if the name/sig combination is found in table.
735 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
736 // The old format checker uses heap sort to find duplicates.
737 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
738 // of table since we don't expect Symbol*'s to move.
739 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
740 assert(name != NULL, "name in constant pool is NULL");
741
742 // First lookup for duplicates
743 int index = hash(name, sig);
744 NameSigHash* entry = table[index];
745 while (entry != NULL) {
746 if (entry->_name == name && entry->_sig == sig) {
747 return false;
748 }
749 entry = entry->_next;
750 }
751
752 // No duplicate is found, allocate a new entry and fill it.
753 entry = new NameSigHash();
754 entry->_name = name;
755 entry->_sig = sig;
756
757 // Insert into hash table
758 entry->_next = table[index];
759 table[index] = entry;
760
761 return true;
762 }
763
764
765 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
766 Handle protection_domain,
767 Symbol* class_name,
768 bool* has_default_methods,
769 TRAPS) {
770 if (length == 0) {
771 _local_interfaces = Universe::the_empty_klass_array();
772 } else {
773 ClassFileStream* cfs = stream();
774 assert(length > 0, "only called for length>0");
775 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
776
777 int index;
778 for (index = 0; index < length; index++) {
779 u2 interface_index = cfs->get_u2(CHECK_NULL);
780 KlassHandle interf;
781 check_property(
782 valid_klass_reference_at(interface_index),
783 "Interface name has bad constant pool index %u in class file %s",
784 interface_index, CHECK_NULL);
785 if (_cp->tag_at(interface_index).is_klass()) {
786 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
787 } else {
788 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
789
790 // Don't need to check legal name because it's checked when parsing constant pool.
791 // But need to make sure it's not an array type.
792 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
793 "Bad interface name in class file %s", CHECK_NULL);
794 Handle class_loader(THREAD, _loader_data->class_loader());
795
796 // Call resolve_super so classcircularity is checked
797 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
798 unresolved_klass, class_loader, protection_domain,
799 false, CHECK_NULL);
800 interf = KlassHandle(THREAD, k);
801 }
802
803 if (!interf()->is_interface()) {
804 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
805 }
806 if (InstanceKlass::cast(interf())->has_default_methods()) {
807 *has_default_methods = true;
808 }
809 _local_interfaces->at_put(index, interf());
810 }
811
812 if (!_need_verify || length <= 1) {
813 return _local_interfaces;
814 }
815
816 // Check if there's any duplicates in interfaces
817 ResourceMark rm(THREAD);
818 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
819 THREAD, NameSigHash*, HASH_ROW_SIZE);
820 initialize_hashtable(interface_names);
821 bool dup = false;
822 {
823 debug_only(No_Safepoint_Verifier nsv;)
824 for (index = 0; index < length; index++) {
825 Klass* k = _local_interfaces->at(index);
826 Symbol* name = InstanceKlass::cast(k)->name();
827 // If no duplicates, add (name, NULL) in hashtable interface_names.
828 if (!put_after_lookup(name, NULL, interface_names)) {
829 dup = true;
830 break;
831 }
832 }
833 }
834 if (dup) {
835 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
836 }
837 }
838 return _local_interfaces;
839 }
840
841
842 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
843 // Make sure the constant pool entry is of a type appropriate to this field
844 guarantee_property(
845 (constantvalue_index > 0 &&
846 constantvalue_index < _cp->length()),
847 "Bad initial value index %u in ConstantValue attribute in class file %s",
848 constantvalue_index, CHECK);
849 constantTag value_type = _cp->tag_at(constantvalue_index);
850 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
851 case T_LONG:
852 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
853 break;
854 case T_FLOAT:
855 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
856 break;
857 case T_DOUBLE:
858 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
859 break;
860 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
861 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
862 break;
863 case T_OBJECT:
864 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
865 && value_type.is_string()),
866 "Bad string initial value in class file %s", CHECK);
867 break;
868 default:
869 classfile_parse_error(
870 "Unable to set initial value %u in class file %s",
871 constantvalue_index, CHECK);
872 }
873 }
874
875
876 // Parse attributes for a field.
877 void ClassFileParser::parse_field_attributes(u2 attributes_count,
878 bool is_static, u2 signature_index,
879 u2* constantvalue_index_addr,
880 bool* is_synthetic_addr,
881 u2* generic_signature_index_addr,
882 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
883 TRAPS) {
884 ClassFileStream* cfs = stream();
885 assert(attributes_count > 0, "length should be greater than 0");
886 u2 constantvalue_index = 0;
887 u2 generic_signature_index = 0;
888 bool is_synthetic = false;
889 u1* runtime_visible_annotations = NULL;
890 int runtime_visible_annotations_length = 0;
891 u1* runtime_invisible_annotations = NULL;
892 int runtime_invisible_annotations_length = 0;
893 u1* runtime_visible_type_annotations = NULL;
894 int runtime_visible_type_annotations_length = 0;
895 u1* runtime_invisible_type_annotations = NULL;
896 int runtime_invisible_type_annotations_length = 0;
897 bool runtime_invisible_annotations_exists = false;
898 bool runtime_invisible_type_annotations_exists = false;
899 while (attributes_count--) {
900 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
901 u2 attribute_name_index = cfs->get_u2_fast();
902 u4 attribute_length = cfs->get_u4_fast();
903 check_property(valid_symbol_at(attribute_name_index),
904 "Invalid field attribute index %u in class file %s",
905 attribute_name_index,
906 CHECK);
907 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
908 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
909 // ignore if non-static
910 if (constantvalue_index != 0) {
911 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
912 }
913 check_property(
914 attribute_length == 2,
915 "Invalid ConstantValue field attribute length %u in class file %s",
916 attribute_length, CHECK);
917 constantvalue_index = cfs->get_u2(CHECK);
918 if (_need_verify) {
919 verify_constantvalue(constantvalue_index, signature_index, CHECK);
920 }
921 } else if (attribute_name == vmSymbols::tag_synthetic()) {
922 if (attribute_length != 0) {
923 classfile_parse_error(
924 "Invalid Synthetic field attribute length %u in class file %s",
925 attribute_length, CHECK);
926 }
927 is_synthetic = true;
928 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
929 if (attribute_length != 0) {
930 classfile_parse_error(
931 "Invalid Deprecated field attribute length %u in class file %s",
932 attribute_length, CHECK);
933 }
934 } else if (_major_version >= JAVA_1_5_VERSION) {
935 if (attribute_name == vmSymbols::tag_signature()) {
936 if (attribute_length != 2) {
937 classfile_parse_error(
938 "Wrong size %u for field's Signature attribute in class file %s",
939 attribute_length, CHECK);
940 }
941 generic_signature_index = parse_generic_signature_attribute(CHECK);
942 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
943 if (runtime_visible_annotations != NULL) {
944 classfile_parse_error(
945 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
946 }
947 runtime_visible_annotations_length = attribute_length;
948 runtime_visible_annotations = cfs->get_u1_buffer();
949 assert(runtime_visible_annotations != NULL, "null visible annotations");
950 parse_annotations(runtime_visible_annotations,
951 runtime_visible_annotations_length,
952 parsed_annotations,
953 CHECK);
954 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
955 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
956 if (runtime_invisible_annotations_exists) {
957 classfile_parse_error(
958 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
959 }
960 runtime_invisible_annotations_exists = true;
961 if (PreserveAllAnnotations) {
962 runtime_invisible_annotations_length = attribute_length;
963 runtime_invisible_annotations = cfs->get_u1_buffer();
964 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
965 }
966 cfs->skip_u1(attribute_length, CHECK);
967 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
968 if (runtime_visible_type_annotations != NULL) {
969 classfile_parse_error(
970 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
971 }
972 runtime_visible_type_annotations_length = attribute_length;
973 runtime_visible_type_annotations = cfs->get_u1_buffer();
974 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
975 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
976 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
977 if (runtime_invisible_type_annotations_exists) {
978 classfile_parse_error(
979 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
980 } else {
981 runtime_invisible_type_annotations_exists = true;
982 }
983 if (PreserveAllAnnotations) {
984 runtime_invisible_type_annotations_length = attribute_length;
985 runtime_invisible_type_annotations = cfs->get_u1_buffer();
986 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
987 }
988 cfs->skip_u1(attribute_length, CHECK);
989 } else {
990 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
991 }
992 } else {
993 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
994 }
995 }
996
997 *constantvalue_index_addr = constantvalue_index;
998 *is_synthetic_addr = is_synthetic;
999 *generic_signature_index_addr = generic_signature_index;
1000 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1001 runtime_visible_annotations_length,
1002 runtime_invisible_annotations,
1003 runtime_invisible_annotations_length,
1004 CHECK);
1005 parsed_annotations->set_field_annotations(a);
1006 a = assemble_annotations(runtime_visible_type_annotations,
1007 runtime_visible_type_annotations_length,
1008 runtime_invisible_type_annotations,
1009 runtime_invisible_type_annotations_length,
1010 CHECK);
1011 parsed_annotations->set_field_type_annotations(a);
1012 return;
1013 }
1014
1015
1016 // Field allocation types. Used for computing field offsets.
1017
1018 enum FieldAllocationType {
1019 STATIC_OOP, // Oops
1020 STATIC_BYTE, // Boolean, Byte, char
1021 STATIC_SHORT, // shorts
1022 STATIC_WORD, // ints
1023 STATIC_DOUBLE, // aligned long or double
1024 NONSTATIC_OOP,
1025 NONSTATIC_BYTE,
1026 NONSTATIC_SHORT,
1027 NONSTATIC_WORD,
1028 NONSTATIC_DOUBLE,
1029 MAX_FIELD_ALLOCATION_TYPE,
1030 BAD_ALLOCATION_TYPE = -1
1031 };
1032
1033 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1034 BAD_ALLOCATION_TYPE, // 0
1035 BAD_ALLOCATION_TYPE, // 1
1036 BAD_ALLOCATION_TYPE, // 2
1037 BAD_ALLOCATION_TYPE, // 3
1038 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1039 NONSTATIC_SHORT, // T_CHAR = 5,
1040 NONSTATIC_WORD, // T_FLOAT = 6,
1041 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1042 NONSTATIC_BYTE, // T_BYTE = 8,
1043 NONSTATIC_SHORT, // T_SHORT = 9,
1044 NONSTATIC_WORD, // T_INT = 10,
1045 NONSTATIC_DOUBLE, // T_LONG = 11,
1046 NONSTATIC_OOP, // T_OBJECT = 12,
1047 NONSTATIC_OOP, // T_ARRAY = 13,
1048 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1049 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1050 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1051 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1052 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1053 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1054 BAD_ALLOCATION_TYPE, // 0
1055 BAD_ALLOCATION_TYPE, // 1
1056 BAD_ALLOCATION_TYPE, // 2
1057 BAD_ALLOCATION_TYPE, // 3
1058 STATIC_BYTE , // T_BOOLEAN = 4,
1059 STATIC_SHORT, // T_CHAR = 5,
1060 STATIC_WORD, // T_FLOAT = 6,
1061 STATIC_DOUBLE, // T_DOUBLE = 7,
1062 STATIC_BYTE, // T_BYTE = 8,
1063 STATIC_SHORT, // T_SHORT = 9,
1064 STATIC_WORD, // T_INT = 10,
1065 STATIC_DOUBLE, // T_LONG = 11,
1066 STATIC_OOP, // T_OBJECT = 12,
1067 STATIC_OOP, // T_ARRAY = 13,
1068 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1069 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1070 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1071 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1072 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1073 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1074 };
1075
1076 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1077 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1078 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1079 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1080 return result;
1081 }
1082
1083 class FieldAllocationCount: public ResourceObj {
1084 public:
1085 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1086
1087 FieldAllocationCount() {
1088 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1089 count[i] = 0;
1090 }
1091 }
1092
1093 FieldAllocationType update(bool is_static, BasicType type) {
1094 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1095 // Make sure there is no overflow with injected fields.
1096 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1097 count[atype]++;
1098 return atype;
1099 }
1100 };
1101
1102 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1103 bool is_interface,
1104 FieldAllocationCount *fac,
1105 u2* java_fields_count_ptr, TRAPS) {
1106 ClassFileStream* cfs = stream();
1107 cfs->guarantee_more(2, CHECK_NULL); // length
1108 u2 length = cfs->get_u2_fast();
1109 *java_fields_count_ptr = length;
1110
1111 int num_injected = 0;
1112 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1113 int total_fields = length + num_injected;
1114
1115 // The field array starts with tuples of shorts
1116 // [access, name index, sig index, initial value index, byte offset].
1117 // A generic signature slot only exists for field with generic
1118 // signature attribute. And the access flag is set with
1119 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1120 // signature slots are at the end of the field array and after all
1121 // other fields data.
1122 //
1123 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1124 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1125 // ...
1126 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1127 // [generic signature index]
1128 // [generic signature index]
1129 // ...
1130 //
1131 // Allocate a temporary resource array for field data. For each field,
1132 // a slot is reserved in the temporary array for the generic signature
1133 // index. After parsing all fields, the data are copied to a permanent
1134 // array and any unused slots will be discarded.
1135 ResourceMark rm(THREAD);
1136 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1137 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1138
1139 // The generic signature slots start after all other fields' data.
1140 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1141 int num_generic_signature = 0;
1142 for (int n = 0; n < length; n++) {
1143 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1144
1145 AccessFlags access_flags;
1146 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1147 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1148 access_flags.set_flags(flags);
1149
1150 u2 name_index = cfs->get_u2_fast();
1151 int cp_size = _cp->length();
1152 check_property(valid_symbol_at(name_index),
1153 "Invalid constant pool index %u for field name in class file %s",
1154 name_index,
1155 CHECK_NULL);
1156 Symbol* name = _cp->symbol_at(name_index);
1157 verify_legal_field_name(name, CHECK_NULL);
1158
1159 u2 signature_index = cfs->get_u2_fast();
1160 check_property(valid_symbol_at(signature_index),
1161 "Invalid constant pool index %u for field signature in class file %s",
1162 signature_index, CHECK_NULL);
1163 Symbol* sig = _cp->symbol_at(signature_index);
1164 verify_legal_field_signature(name, sig, CHECK_NULL);
1165
1166 u2 constantvalue_index = 0;
1167 bool is_synthetic = false;
1168 u2 generic_signature_index = 0;
1169 bool is_static = access_flags.is_static();
1170 FieldAnnotationCollector parsed_annotations(_loader_data);
1171
1172 u2 attributes_count = cfs->get_u2_fast();
1173 if (attributes_count > 0) {
1174 parse_field_attributes(attributes_count, is_static, signature_index,
1175 &constantvalue_index, &is_synthetic,
1176 &generic_signature_index, &parsed_annotations,
1177 CHECK_NULL);
1178 if (parsed_annotations.field_annotations() != NULL) {
1179 if (_fields_annotations == NULL) {
1180 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1181 _loader_data, length, NULL,
1182 CHECK_NULL);
1183 }
1184 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1185 parsed_annotations.set_field_annotations(NULL);
1186 }
1187 if (parsed_annotations.field_type_annotations() != NULL) {
1188 if (_fields_type_annotations == NULL) {
1189 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1190 _loader_data, length, NULL,
1191 CHECK_NULL);
1192 }
1193 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1194 parsed_annotations.set_field_type_annotations(NULL);
1195 }
1196
1197 if (is_synthetic) {
1198 access_flags.set_is_synthetic();
1199 }
1200 if (generic_signature_index != 0) {
1201 access_flags.set_field_has_generic_signature();
1202 fa[generic_signature_slot] = generic_signature_index;
1203 generic_signature_slot ++;
1204 num_generic_signature ++;
1205 }
1206 }
1207
1208 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1209 field->initialize(access_flags.as_short(),
1210 name_index,
1211 signature_index,
1212 constantvalue_index);
1213 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1214
1215 // Remember how many oops we encountered and compute allocation type
1216 FieldAllocationType atype = fac->update(is_static, type);
1217 field->set_allocation_type(atype);
1218
1219 // After field is initialized with type, we can augment it with aux info
1220 if (parsed_annotations.has_any_annotations())
1221 parsed_annotations.apply_to(field);
1222 }
1223
1224 int index = length;
1225 if (num_injected != 0) {
1226 for (int n = 0; n < num_injected; n++) {
1227 // Check for duplicates
1228 if (injected[n].may_be_java) {
1229 Symbol* name = injected[n].name();
1230 Symbol* signature = injected[n].signature();
1231 bool duplicate = false;
1232 for (int i = 0; i < length; i++) {
1233 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1234 if (name == _cp->symbol_at(f->name_index()) &&
1235 signature == _cp->symbol_at(f->signature_index())) {
1236 // Symbol is desclared in Java so skip this one
1237 duplicate = true;
1238 break;
1239 }
1240 }
1241 if (duplicate) {
1242 // These will be removed from the field array at the end
1243 continue;
1244 }
1245 }
1246
1247 // Injected field
1248 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1249 field->initialize(JVM_ACC_FIELD_INTERNAL,
1250 injected[n].name_index,
1251 injected[n].signature_index,
1252 0);
1253
1254 BasicType type = FieldType::basic_type(injected[n].signature());
1255
1256 // Remember how many oops we encountered and compute allocation type
1257 FieldAllocationType atype = fac->update(false, type);
1258 field->set_allocation_type(atype);
1259 index++;
1260 }
1261 }
1262
1263 // Now copy the fields' data from the temporary resource array.
1264 // Sometimes injected fields already exist in the Java source so
1265 // the fields array could be too long. In that case the
1266 // fields array is trimed. Also unused slots that were reserved
1267 // for generic signature indexes are discarded.
1268 Array<u2>* fields = MetadataFactory::new_array<u2>(
1269 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1270 CHECK_NULL);
1271 _fields = fields; // save in case of error
1272 {
1273 int i = 0;
1274 for (; i < index * FieldInfo::field_slots; i++) {
1275 fields->at_put(i, fa[i]);
1276 }
1277 for (int j = total_fields * FieldInfo::field_slots;
1278 j < generic_signature_slot; j++) {
1279 fields->at_put(i++, fa[j]);
1280 }
1281 assert(i == fields->length(), "");
1282 }
1283
1284 if (_need_verify && length > 1) {
1285 // Check duplicated fields
1286 ResourceMark rm(THREAD);
1287 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1288 THREAD, NameSigHash*, HASH_ROW_SIZE);
1289 initialize_hashtable(names_and_sigs);
1290 bool dup = false;
1291 {
1292 debug_only(No_Safepoint_Verifier nsv;)
1293 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1294 Symbol* name = fs.name();
1295 Symbol* sig = fs.signature();
1296 // If no duplicates, add name/signature in hashtable names_and_sigs.
1297 if (!put_after_lookup(name, sig, names_and_sigs)) {
1298 dup = true;
1299 break;
1300 }
1301 }
1302 }
1303 if (dup) {
1304 classfile_parse_error("Duplicate field name&signature in class file %s",
1305 CHECK_NULL);
1306 }
1307 }
1308
1309 return fields;
1310 }
1311
1312
1313 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1314 while (length-- > 0) {
1315 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1316 }
1317 }
1318
1319
1320 u2* ClassFileParser::parse_exception_table(u4 code_length,
1321 u4 exception_table_length,
1322 TRAPS) {
1323 ClassFileStream* cfs = stream();
1324
1325 u2* exception_table_start = cfs->get_u2_buffer();
1326 assert(exception_table_start != NULL, "null exception table");
1327 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1328 // Will check legal target after parsing code array in verifier.
1329 if (_need_verify) {
1330 for (unsigned int i = 0; i < exception_table_length; i++) {
1331 u2 start_pc = cfs->get_u2_fast();
1332 u2 end_pc = cfs->get_u2_fast();
1333 u2 handler_pc = cfs->get_u2_fast();
1334 u2 catch_type_index = cfs->get_u2_fast();
1335 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1336 "Illegal exception table range in class file %s",
1337 CHECK_NULL);
1338 guarantee_property(handler_pc < code_length,
1339 "Illegal exception table handler in class file %s",
1340 CHECK_NULL);
1341 if (catch_type_index != 0) {
1342 guarantee_property(valid_klass_reference_at(catch_type_index),
1343 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1344 }
1345 }
1346 } else {
1347 cfs->skip_u2_fast(exception_table_length * 4);
1348 }
1349 return exception_table_start;
1350 }
1351
1352 void ClassFileParser::parse_linenumber_table(
1353 u4 code_attribute_length, u4 code_length,
1354 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1355 ClassFileStream* cfs = stream();
1356 unsigned int num_entries = cfs->get_u2(CHECK);
1357
1358 // Each entry is a u2 start_pc, and a u2 line_number
1359 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1360
1361 // Verify line number attribute and table length
1362 check_property(
1363 code_attribute_length == sizeof(u2) + length_in_bytes,
1364 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1365
1366 cfs->guarantee_more(length_in_bytes, CHECK);
1367
1368 if ((*write_stream) == NULL) {
1369 if (length_in_bytes > fixed_buffer_size) {
1370 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1371 } else {
1372 (*write_stream) = new CompressedLineNumberWriteStream(
1373 linenumbertable_buffer, fixed_buffer_size);
1374 }
1375 }
1376
1377 while (num_entries-- > 0) {
1378 u2 bci = cfs->get_u2_fast(); // start_pc
1379 u2 line = cfs->get_u2_fast(); // line_number
1380 guarantee_property(bci < code_length,
1381 "Invalid pc in LineNumberTable in class file %s", CHECK);
1382 (*write_stream)->write_pair(bci, line);
1383 }
1384 }
1385
1386
1387 class LVT_Hash : public AllStatic {
1388 public:
1389
1390 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1391 /*
1392 * 3-tuple start_bci/length/slot has to be unique key,
1393 * so the following comparison seems to be redundant:
1394 * && elem->name_cp_index == entry->_elem->name_cp_index
1395 */
1396 return (e0.start_bci == e1.start_bci &&
1397 e0.length == e1.length &&
1398 e0.name_cp_index == e1.name_cp_index &&
1399 e0.slot == e1.slot);
1400 }
1401
1402 static unsigned int hash(LocalVariableTableElement const& e0) {
1403 unsigned int raw_hash = e0.start_bci;
1404
1405 raw_hash = e0.length + raw_hash * 37;
1406 raw_hash = e0.name_cp_index + raw_hash * 37;
1407 raw_hash = e0.slot + raw_hash * 37;
1408
1409 return raw_hash;
1410 }
1411 };
1412
1413
1414 // Class file LocalVariableTable elements.
1415 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1416 public:
1417 u2 start_bci;
1418 u2 length;
1419 u2 name_cp_index;
1420 u2 descriptor_cp_index;
1421 u2 slot;
1422 };
1423
1424 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1425 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1426 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1427 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1428 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1429 lvt->signature_cp_index = 0;
1430 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1431 }
1432
1433 // Function is used to parse both attributes:
1434 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1435 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1436 u2 max_locals,
1437 u4 code_attribute_length,
1438 u2* localvariable_table_length,
1439 bool isLVTT,
1440 TRAPS) {
1441 ClassFileStream* cfs = stream();
1442 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1443 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1444 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1445 // Verify local variable table attribute has right length
1446 if (_need_verify) {
1447 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1448 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1449 }
1450 u2* localvariable_table_start = cfs->get_u2_buffer();
1451 assert(localvariable_table_start != NULL, "null local variable table");
1452 if (!_need_verify) {
1453 cfs->skip_u2_fast(size);
1454 } else {
1455 cfs->guarantee_more(size * 2, CHECK_NULL);
1456 for(int i = 0; i < (*localvariable_table_length); i++) {
1457 u2 start_pc = cfs->get_u2_fast();
1458 u2 length = cfs->get_u2_fast();
1459 u2 name_index = cfs->get_u2_fast();
1460 u2 descriptor_index = cfs->get_u2_fast();
1461 u2 index = cfs->get_u2_fast();
1462 // Assign to a u4 to avoid overflow
1463 u4 end_pc = (u4)start_pc + (u4)length;
1464
1465 if (start_pc >= code_length) {
1466 classfile_parse_error(
1467 "Invalid start_pc %u in %s in class file %s",
1468 start_pc, tbl_name, CHECK_NULL);
1469 }
1470 if (end_pc > code_length) {
1471 classfile_parse_error(
1472 "Invalid length %u in %s in class file %s",
1473 length, tbl_name, CHECK_NULL);
1474 }
1475 int cp_size = _cp->length();
1476 guarantee_property(valid_symbol_at(name_index),
1477 "Name index %u in %s has bad constant type in class file %s",
1478 name_index, tbl_name, CHECK_NULL);
1479 guarantee_property(valid_symbol_at(descriptor_index),
1480 "Signature index %u in %s has bad constant type in class file %s",
1481 descriptor_index, tbl_name, CHECK_NULL);
1482
1483 Symbol* name = _cp->symbol_at(name_index);
1484 Symbol* sig = _cp->symbol_at(descriptor_index);
1485 verify_legal_field_name(name, CHECK_NULL);
1486 u2 extra_slot = 0;
1487 if (!isLVTT) {
1488 verify_legal_field_signature(name, sig, CHECK_NULL);
1489
1490 // 4894874: check special cases for double and long local variables
1491 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1492 sig == vmSymbols::type_signature(T_LONG)) {
1493 extra_slot = 1;
1494 }
1495 }
1496 guarantee_property((index + extra_slot) < max_locals,
1497 "Invalid index %u in %s in class file %s",
1498 index, tbl_name, CHECK_NULL);
1499 }
1500 }
1501 return localvariable_table_start;
1502 }
1503
1504
1505 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1506 u1* u1_array, u2* u2_array, TRAPS) {
1507 ClassFileStream* cfs = stream();
1508 u2 index = 0; // index in the array with long/double occupying two slots
1509 u4 i1 = *u1_index;
1510 u4 i2 = *u2_index + 1;
1511 for(int i = 0; i < array_length; i++) {
1512 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1513 index++;
1514 if (tag == ITEM_Long || tag == ITEM_Double) {
1515 index++;
1516 } else if (tag == ITEM_Object) {
1517 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1518 guarantee_property(valid_klass_reference_at(class_index),
1519 "Bad class index %u in StackMap in class file %s",
1520 class_index, CHECK);
1521 } else if (tag == ITEM_Uninitialized) {
1522 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1523 guarantee_property(
1524 offset < code_length,
1525 "Bad uninitialized type offset %u in StackMap in class file %s",
1526 offset, CHECK);
1527 } else {
1528 guarantee_property(
1529 tag <= (u1)ITEM_Uninitialized,
1530 "Unknown variable type %u in StackMap in class file %s",
1531 tag, CHECK);
1532 }
1533 }
1534 u2_array[*u2_index] = index;
1535 *u1_index = i1;
1536 *u2_index = i2;
1537 }
1538
1539 u1* ClassFileParser::parse_stackmap_table(
1540 u4 code_attribute_length, TRAPS) {
1541 if (code_attribute_length == 0)
1542 return NULL;
1543
1544 ClassFileStream* cfs = stream();
1545 u1* stackmap_table_start = cfs->get_u1_buffer();
1546 assert(stackmap_table_start != NULL, "null stackmap table");
1547
1548 // check code_attribute_length first
1549 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1550
1551 if (!_need_verify && !DumpSharedSpaces) {
1552 return NULL;
1553 }
1554 return stackmap_table_start;
1555 }
1556
1557 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1558 u4 method_attribute_length,
1559 TRAPS) {
1560 ClassFileStream* cfs = stream();
1561 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1562 *checked_exceptions_length = cfs->get_u2_fast();
1563 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1564 u2* checked_exceptions_start = cfs->get_u2_buffer();
1565 assert(checked_exceptions_start != NULL, "null checked exceptions");
1566 if (!_need_verify) {
1567 cfs->skip_u2_fast(size);
1568 } else {
1569 // Verify each value in the checked exception table
1570 u2 checked_exception;
1571 u2 len = *checked_exceptions_length;
1572 cfs->guarantee_more(2 * len, CHECK_NULL);
1573 for (int i = 0; i < len; i++) {
1574 checked_exception = cfs->get_u2_fast();
1575 check_property(
1576 valid_klass_reference_at(checked_exception),
1577 "Exception name has bad type at constant pool %u in class file %s",
1578 checked_exception, CHECK_NULL);
1579 }
1580 }
1581 // check exceptions attribute length
1582 if (_need_verify) {
1583 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1584 sizeof(u2) * size),
1585 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1586 }
1587 return checked_exceptions_start;
1588 }
1589
1590 void ClassFileParser::throwIllegalSignature(
1591 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1592 ResourceMark rm(THREAD);
1593 Exceptions::fthrow(THREAD_AND_LOCATION,
1594 vmSymbols::java_lang_ClassFormatError(),
1595 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1596 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1597 }
1598
1599 // Skip an annotation. Return >=limit if there is any problem.
1600 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1601 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1602 // value := switch (tag:u1) { ... }
1603 index += 2; // skip atype
1604 if ((index += 2) >= limit) return limit; // read nmem
1605 int nmem = Bytes::get_Java_u2(buffer+index-2);
1606 while (--nmem >= 0 && index < limit) {
1607 index += 2; // skip member
1608 index = skip_annotation_value(buffer, limit, index);
1609 }
1610 return index;
1611 }
1612
1613 // Skip an annotation value. Return >=limit if there is any problem.
1614 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1615 // value := switch (tag:u1) {
1616 // case B, C, I, S, Z, D, F, J, c: con:u2;
1617 // case e: e_class:u2 e_name:u2;
1618 // case s: s_con:u2;
1619 // case [: do(nval:u2) {value};
1620 // case @: annotation;
1621 // case s: s_con:u2;
1622 // }
1623 if ((index += 1) >= limit) return limit; // read tag
1624 u1 tag = buffer[index-1];
1625 switch (tag) {
1626 case 'B': case 'C': case 'I': case 'S': case 'Z':
1627 case 'D': case 'F': case 'J': case 'c': case 's':
1628 index += 2; // skip con or s_con
1629 break;
1630 case 'e':
1631 index += 4; // skip e_class, e_name
1632 break;
1633 case '[':
1634 {
1635 if ((index += 2) >= limit) return limit; // read nval
1636 int nval = Bytes::get_Java_u2(buffer+index-2);
1637 while (--nval >= 0 && index < limit) {
1638 index = skip_annotation_value(buffer, limit, index);
1639 }
1640 }
1641 break;
1642 case '@':
1643 index = skip_annotation(buffer, limit, index);
1644 break;
1645 default:
1646 assert(false, "annotation tag");
1647 return limit; // bad tag byte
1648 }
1649 return index;
1650 }
1651
1652 // Sift through annotations, looking for those significant to the VM:
1653 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1654 ClassFileParser::AnnotationCollector* coll,
1655 TRAPS) {
1656 // annotations := do(nann:u2) {annotation}
1657 int index = 0;
1658 if ((index += 2) >= limit) return; // read nann
1659 int nann = Bytes::get_Java_u2(buffer+index-2);
1660 enum { // initial annotation layout
1661 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1662 count_off = 2, // u2 such as 1 (one value)
1663 member_off = 4, // utf8 such as 'value'
1664 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1665 e_tag_val = 'e',
1666 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1667 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1668 e_size = 11, // end of 'e' annotation
1669 c_tag_val = 'c', // payload is type
1670 c_con_off = 7, // utf8 payload, such as 'I'
1671 c_size = 9, // end of 'c' annotation
1672 s_tag_val = 's', // payload is String
1673 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1674 s_size = 9,
1675 min_size = 6 // smallest possible size (zero members)
1676 };
1677 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1678 int index0 = index;
1679 index = skip_annotation(buffer, limit, index);
1680 u1* abase = buffer + index0;
1681 int atype = Bytes::get_Java_u2(abase + atype_off);
1682 int count = Bytes::get_Java_u2(abase + count_off);
1683 Symbol* aname = check_symbol_at(_cp, atype);
1684 if (aname == NULL) break; // invalid annotation name
1685 Symbol* member = NULL;
1686 if (count >= 1) {
1687 int member_index = Bytes::get_Java_u2(abase + member_off);
1688 member = check_symbol_at(_cp, member_index);
1689 if (member == NULL) break; // invalid member name
1690 }
1691
1692 // Here is where parsing particular annotations will take place.
1693 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1694 if (id == AnnotationCollector::_unknown) continue;
1695 coll->set_annotation(id);
1696
1697 if (id == AnnotationCollector::_sun_misc_Contended) {
1698 // @Contended can optionally specify the contention group.
1699 //
1700 // Contended group defines the equivalence class over the fields:
1701 // the fields within the same contended group are not treated distinct.
1702 // The only exception is default group, which does not incur the
1703 // equivalence. Naturally, contention group for classes is meaningless.
1704 //
1705 // While the contention group is specified as String, annotation
1706 // values are already interned, and we might as well use the constant
1707 // pool index as the group tag.
1708 //
1709 u2 group_index = 0; // default contended group
1710 if (count == 1
1711 && s_size == (index - index0) // match size
1712 && s_tag_val == *(abase + tag_off)
1713 && member == vmSymbols::value_name()) {
1714 group_index = Bytes::get_Java_u2(abase + s_con_off);
1715 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1716 group_index = 0; // default contended group
1717 }
1718 }
1719 coll->set_contended_group(group_index);
1720 }
1721 }
1722 }
1723
1724 ClassFileParser::AnnotationCollector::ID
1725 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1726 Symbol* name) {
1727 vmSymbols::SID sid = vmSymbols::find_sid(name);
1728 // Privileged code can use all annotations. Other code silently drops some.
1729 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1730 loader_data->is_ext_class_loader_data() ||
1731 loader_data->is_anonymous();
1732 switch (sid) {
1733 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1734 if (_location != _in_method) break; // only allow for methods
1735 if (!privileged) break; // only allow in privileged code
1736 return _method_CallerSensitive;
1737 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1738 if (_location != _in_method) break; // only allow for methods
1739 if (!privileged) break; // only allow in privileged code
1740 return _method_ForceInline;
1741 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1742 if (_location != _in_method) break; // only allow for methods
1743 if (!privileged) break; // only allow in privileged code
1744 return _method_DontInline;
1745 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1746 if (_location != _in_method) break; // only allow for methods
1747 if (!privileged) break; // only allow in privileged code
1748 return _method_InjectedProfile;
1749 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1750 if (_location != _in_method) break; // only allow for methods
1751 if (!privileged) break; // only allow in privileged code
1752 return _method_LambdaForm_Compiled;
1753 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1754 if (_location != _in_method) break; // only allow for methods
1755 if (!privileged) break; // only allow in privileged code
1756 return _method_LambdaForm_Hidden;
1757 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1758 if (_location != _in_field) break; // only allow for fields
1759 if (!privileged) break; // only allow in privileged code
1760 return _field_Stable;
1761 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1762 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1763 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1764 return _sun_misc_Contended;
1765 default: break;
1766 }
1767 return AnnotationCollector::_unknown;
1768 }
1769
1770 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1771 if (is_contended())
1772 f->set_contended_group(contended_group());
1773 if (is_stable())
1774 f->set_stable(true);
1775 }
1776
1777 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1778 // If there's an error deallocate metadata for field annotations
1779 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1780 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1781 }
1782
1783 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1784 if (has_annotation(_method_CallerSensitive))
1785 m->set_caller_sensitive(true);
1786 if (has_annotation(_method_ForceInline))
1787 m->set_force_inline(true);
1788 if (has_annotation(_method_DontInline))
1789 m->set_dont_inline(true);
1790 if (has_annotation(_method_InjectedProfile))
1791 m->set_has_injected_profile(true);
1792 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1793 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1794 if (has_annotation(_method_LambdaForm_Hidden))
1795 m->set_hidden(true);
1796 }
1797
1798 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1799 k->set_is_contended(is_contended());
1800 }
1801
1802
1803 #define MAX_ARGS_SIZE 255
1804 #define MAX_CODE_SIZE 65535
1805 #define INITIAL_MAX_LVT_NUMBER 256
1806
1807 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1808 *
1809 * Rules for LVT's and LVTT's are:
1810 * - There can be any number of LVT's and LVTT's.
1811 * - If there are n LVT's, it is the same as if there was just
1812 * one LVT containing all the entries from the n LVT's.
1813 * - There may be no more than one LVT entry per local variable.
1814 * Two LVT entries are 'equal' if these fields are the same:
1815 * start_pc, length, name, slot
1816 * - There may be no more than one LVTT entry per each LVT entry.
1817 * Each LVTT entry has to match some LVT entry.
1818 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1819 */
1820 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1821 int lvt_cnt,
1822 u2* localvariable_table_length,
1823 u2** localvariable_table_start,
1824 int lvtt_cnt,
1825 u2* localvariable_type_table_length,
1826 u2** localvariable_type_table_start,
1827 TRAPS) {
1828
1829 ResourceMark rm(THREAD);
1830
1831 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1832 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1833
1834 LVT_HashTable* table = new LVT_HashTable();
1835
1836 // To fill LocalVariableTable in
1837 Classfile_LVT_Element* cf_lvt;
1838 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1839
1840 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1841 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1842 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1843 copy_lvt_element(&cf_lvt[idx], lvt);
1844 // If no duplicates, add LVT elem in hashtable.
1845 if (table->put(*lvt, lvt) == false
1846 && _need_verify
1847 && _major_version >= JAVA_1_5_VERSION) {
1848 classfile_parse_error("Duplicated LocalVariableTable attribute "
1849 "entry for '%s' in class file %s",
1850 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1851 CHECK);
1852 }
1853 }
1854 }
1855
1856 // To merge LocalVariableTable and LocalVariableTypeTable
1857 Classfile_LVT_Element* cf_lvtt;
1858 LocalVariableTableElement lvtt_elem;
1859
1860 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1861 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1862 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1863 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1864 LocalVariableTableElement** entry = table->get(lvtt_elem);
1865 if (entry == NULL) {
1866 if (_need_verify) {
1867 classfile_parse_error("LVTT entry for '%s' in class file %s "
1868 "does not match any LVT entry",
1869 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1870 CHECK);
1871 }
1872 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1873 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1874 "entry for '%s' in class file %s",
1875 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1876 CHECK);
1877 } else {
1878 // to add generic signatures into LocalVariableTable
1879 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1880 }
1881 }
1882 }
1883 }
1884
1885
1886 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1887 u1* runtime_visible_annotations,
1888 int runtime_visible_annotations_length,
1889 u1* runtime_invisible_annotations,
1890 int runtime_invisible_annotations_length,
1891 u1* runtime_visible_parameter_annotations,
1892 int runtime_visible_parameter_annotations_length,
1893 u1* runtime_invisible_parameter_annotations,
1894 int runtime_invisible_parameter_annotations_length,
1895 u1* runtime_visible_type_annotations,
1896 int runtime_visible_type_annotations_length,
1897 u1* runtime_invisible_type_annotations,
1898 int runtime_invisible_type_annotations_length,
1899 u1* annotation_default,
1900 int annotation_default_length,
1901 TRAPS) {
1902
1903 AnnotationArray* a;
1904
1905 if (runtime_visible_annotations_length +
1906 runtime_invisible_annotations_length > 0) {
1907 a = assemble_annotations(runtime_visible_annotations,
1908 runtime_visible_annotations_length,
1909 runtime_invisible_annotations,
1910 runtime_invisible_annotations_length,
1911 CHECK);
1912 cm->set_method_annotations(a);
1913 }
1914
1915 if (runtime_visible_parameter_annotations_length +
1916 runtime_invisible_parameter_annotations_length > 0) {
1917 a = assemble_annotations(runtime_visible_parameter_annotations,
1918 runtime_visible_parameter_annotations_length,
1919 runtime_invisible_parameter_annotations,
1920 runtime_invisible_parameter_annotations_length,
1921 CHECK);
1922 cm->set_parameter_annotations(a);
1923 }
1924
1925 if (annotation_default_length > 0) {
1926 a = assemble_annotations(annotation_default,
1927 annotation_default_length,
1928 NULL,
1929 0,
1930 CHECK);
1931 cm->set_default_annotations(a);
1932 }
1933
1934 if (runtime_visible_type_annotations_length +
1935 runtime_invisible_type_annotations_length > 0) {
1936 a = assemble_annotations(runtime_visible_type_annotations,
1937 runtime_visible_type_annotations_length,
1938 runtime_invisible_type_annotations,
1939 runtime_invisible_type_annotations_length,
1940 CHECK);
1941 cm->set_type_annotations(a);
1942 }
1943 }
1944
1945
1946 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1947 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1948 // Method* to save footprint, so we only know the size of the resulting Method* when the
1949 // entire method attribute is parsed.
1950 //
1951 // The promoted_flags parameter is used to pass relevant access_flags
1952 // from the method back up to the containing klass. These flag values
1953 // are added to klass's access_flags.
1954
1955 methodHandle ClassFileParser::parse_method(bool is_interface,
1956 AccessFlags *promoted_flags,
1957 TRAPS) {
1958 ClassFileStream* cfs = stream();
1959 methodHandle nullHandle;
1960 ResourceMark rm(THREAD);
1961 // Parse fixed parts
1962 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1963
1964 int flags = cfs->get_u2_fast();
1965 u2 name_index = cfs->get_u2_fast();
1966 int cp_size = _cp->length();
1967 check_property(
1968 valid_symbol_at(name_index),
1969 "Illegal constant pool index %u for method name in class file %s",
1970 name_index, CHECK_(nullHandle));
1971 Symbol* name = _cp->symbol_at(name_index);
1972 verify_legal_method_name(name, CHECK_(nullHandle));
1973
1974 u2 signature_index = cfs->get_u2_fast();
1975 guarantee_property(
1976 valid_symbol_at(signature_index),
1977 "Illegal constant pool index %u for method signature in class file %s",
1978 signature_index, CHECK_(nullHandle));
1979 Symbol* signature = _cp->symbol_at(signature_index);
1980
1981 AccessFlags access_flags;
1982 if (name == vmSymbols::class_initializer_name()) {
1983 // We ignore the other access flags for a valid class initializer.
1984 // (JVM Spec 2nd ed., chapter 4.6)
1985 if (_major_version < 51) { // backward compatibility
1986 flags = JVM_ACC_STATIC;
1987 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1988 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1989 }
1990 } else {
1991 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1992 }
1993
1994 int args_size = -1; // only used when _need_verify is true
1995 if (_need_verify) {
1996 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1997 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1998 if (args_size > MAX_ARGS_SIZE) {
1999 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2000 }
2001 }
2002
2003 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2004
2005 // Default values for code and exceptions attribute elements
2006 u2 max_stack = 0;
2007 u2 max_locals = 0;
2008 u4 code_length = 0;
2009 u1* code_start = 0;
2010 u2 exception_table_length = 0;
2011 u2* exception_table_start = NULL;
2012 Array<int>* exception_handlers = Universe::the_empty_int_array();
2013 u2 checked_exceptions_length = 0;
2014 u2* checked_exceptions_start = NULL;
2015 CompressedLineNumberWriteStream* linenumber_table = NULL;
2016 int linenumber_table_length = 0;
2017 int total_lvt_length = 0;
2018 u2 lvt_cnt = 0;
2019 u2 lvtt_cnt = 0;
2020 bool lvt_allocated = false;
2021 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2022 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2023 u2* localvariable_table_length;
2024 u2** localvariable_table_start;
2025 u2* localvariable_type_table_length;
2026 u2** localvariable_type_table_start;
2027 int method_parameters_length = -1;
2028 u1* method_parameters_data = NULL;
2029 bool method_parameters_seen = false;
2030 bool parsed_code_attribute = false;
2031 bool parsed_checked_exceptions_attribute = false;
2032 bool parsed_stackmap_attribute = false;
2033 // stackmap attribute - JDK1.5
2034 u1* stackmap_data = NULL;
2035 int stackmap_data_length = 0;
2036 u2 generic_signature_index = 0;
2037 MethodAnnotationCollector parsed_annotations;
2038 u1* runtime_visible_annotations = NULL;
2039 int runtime_visible_annotations_length = 0;
2040 u1* runtime_invisible_annotations = NULL;
2041 int runtime_invisible_annotations_length = 0;
2042 u1* runtime_visible_parameter_annotations = NULL;
2043 int runtime_visible_parameter_annotations_length = 0;
2044 u1* runtime_invisible_parameter_annotations = NULL;
2045 int runtime_invisible_parameter_annotations_length = 0;
2046 u1* runtime_visible_type_annotations = NULL;
2047 int runtime_visible_type_annotations_length = 0;
2048 u1* runtime_invisible_type_annotations = NULL;
2049 int runtime_invisible_type_annotations_length = 0;
2050 bool runtime_invisible_annotations_exists = false;
2051 bool runtime_invisible_type_annotations_exists = false;
2052 bool runtime_invisible_parameter_annotations_exists = false;
2053 u1* annotation_default = NULL;
2054 int annotation_default_length = 0;
2055
2056 // Parse code and exceptions attribute
2057 u2 method_attributes_count = cfs->get_u2_fast();
2058 while (method_attributes_count--) {
2059 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2060 u2 method_attribute_name_index = cfs->get_u2_fast();
2061 u4 method_attribute_length = cfs->get_u4_fast();
2062 check_property(
2063 valid_symbol_at(method_attribute_name_index),
2064 "Invalid method attribute name index %u in class file %s",
2065 method_attribute_name_index, CHECK_(nullHandle));
2066
2067 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2068 if (method_attribute_name == vmSymbols::tag_code()) {
2069 // Parse Code attribute
2070 if (_need_verify) {
2071 guarantee_property(
2072 !access_flags.is_native() && !access_flags.is_abstract(),
2073 "Code attribute in native or abstract methods in class file %s",
2074 CHECK_(nullHandle));
2075 }
2076 if (parsed_code_attribute) {
2077 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2078 }
2079 parsed_code_attribute = true;
2080
2081 // Stack size, locals size, and code size
2082 if (_major_version == 45 && _minor_version <= 2) {
2083 cfs->guarantee_more(4, CHECK_(nullHandle));
2084 max_stack = cfs->get_u1_fast();
2085 max_locals = cfs->get_u1_fast();
2086 code_length = cfs->get_u2_fast();
2087 } else {
2088 cfs->guarantee_more(8, CHECK_(nullHandle));
2089 max_stack = cfs->get_u2_fast();
2090 max_locals = cfs->get_u2_fast();
2091 code_length = cfs->get_u4_fast();
2092 }
2093 if (_need_verify) {
2094 guarantee_property(args_size <= max_locals,
2095 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2096 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2097 "Invalid method Code length %u in class file %s",
2098 code_length, CHECK_(nullHandle));
2099 }
2100 // Code pointer
2101 code_start = cfs->get_u1_buffer();
2102 assert(code_start != NULL, "null code start");
2103 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2104 cfs->skip_u1_fast(code_length);
2105
2106 // Exception handler table
2107 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2108 exception_table_length = cfs->get_u2_fast();
2109 if (exception_table_length > 0) {
2110 exception_table_start =
2111 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2112 }
2113
2114 // Parse additional attributes in code attribute
2115 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2116 u2 code_attributes_count = cfs->get_u2_fast();
2117
2118 unsigned int calculated_attribute_length = 0;
2119
2120 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2121 calculated_attribute_length =
2122 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2123 } else {
2124 // max_stack, locals and length are smaller in pre-version 45.2 classes
2125 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2126 }
2127 calculated_attribute_length +=
2128 code_length +
2129 sizeof(exception_table_length) +
2130 sizeof(code_attributes_count) +
2131 exception_table_length *
2132 ( sizeof(u2) + // start_pc
2133 sizeof(u2) + // end_pc
2134 sizeof(u2) + // handler_pc
2135 sizeof(u2) ); // catch_type_index
2136
2137 while (code_attributes_count--) {
2138 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2139 u2 code_attribute_name_index = cfs->get_u2_fast();
2140 u4 code_attribute_length = cfs->get_u4_fast();
2141 calculated_attribute_length += code_attribute_length +
2142 sizeof(code_attribute_name_index) +
2143 sizeof(code_attribute_length);
2144 check_property(valid_symbol_at(code_attribute_name_index),
2145 "Invalid code attribute name index %u in class file %s",
2146 code_attribute_name_index,
2147 CHECK_(nullHandle));
2148 if (LoadLineNumberTables &&
2149 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2150 // Parse and compress line number table
2151 parse_linenumber_table(code_attribute_length, code_length,
2152 &linenumber_table, CHECK_(nullHandle));
2153
2154 } else if (LoadLocalVariableTables &&
2155 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2156 // Parse local variable table
2157 if (!lvt_allocated) {
2158 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2159 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2160 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2161 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2162 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2163 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2164 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2165 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2166 lvt_allocated = true;
2167 }
2168 if (lvt_cnt == max_lvt_cnt) {
2169 max_lvt_cnt <<= 1;
2170 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2171 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2172 }
2173 localvariable_table_start[lvt_cnt] =
2174 parse_localvariable_table(code_length,
2175 max_locals,
2176 code_attribute_length,
2177 &localvariable_table_length[lvt_cnt],
2178 false, // is not LVTT
2179 CHECK_(nullHandle));
2180 total_lvt_length += localvariable_table_length[lvt_cnt];
2181 lvt_cnt++;
2182 } else if (LoadLocalVariableTypeTables &&
2183 _major_version >= JAVA_1_5_VERSION &&
2184 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2185 if (!lvt_allocated) {
2186 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2187 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2188 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2189 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2190 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2191 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2192 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2193 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2194 lvt_allocated = true;
2195 }
2196 // Parse local variable type table
2197 if (lvtt_cnt == max_lvtt_cnt) {
2198 max_lvtt_cnt <<= 1;
2199 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2200 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2201 }
2202 localvariable_type_table_start[lvtt_cnt] =
2203 parse_localvariable_table(code_length,
2204 max_locals,
2205 code_attribute_length,
2206 &localvariable_type_table_length[lvtt_cnt],
2207 true, // is LVTT
2208 CHECK_(nullHandle));
2209 lvtt_cnt++;
2210 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2211 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2212 // Stack map is only needed by the new verifier in JDK1.5.
2213 if (parsed_stackmap_attribute) {
2214 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2215 }
2216 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2217 stackmap_data_length = code_attribute_length;
2218 parsed_stackmap_attribute = true;
2219 } else {
2220 // Skip unknown attributes
2221 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2222 }
2223 }
2224 // check method attribute length
2225 if (_need_verify) {
2226 guarantee_property(method_attribute_length == calculated_attribute_length,
2227 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2228 }
2229 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2230 // Parse Exceptions attribute
2231 if (parsed_checked_exceptions_attribute) {
2232 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2233 }
2234 parsed_checked_exceptions_attribute = true;
2235 checked_exceptions_start =
2236 parse_checked_exceptions(&checked_exceptions_length,
2237 method_attribute_length,
2238 CHECK_(nullHandle));
2239 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2240 // reject multiple method parameters
2241 if (method_parameters_seen) {
2242 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2243 }
2244 method_parameters_seen = true;
2245 method_parameters_length = cfs->get_u1_fast();
2246 const u2 real_length = (method_parameters_length * 4u) + 1u;
2247 if (method_attribute_length != real_length) {
2248 classfile_parse_error(
2249 "Invalid MethodParameters method attribute length %u in class file",
2250 method_attribute_length, CHECK_(nullHandle));
2251 }
2252 method_parameters_data = cfs->get_u1_buffer();
2253 cfs->skip_u2_fast(method_parameters_length);
2254 cfs->skip_u2_fast(method_parameters_length);
2255 // ignore this attribute if it cannot be reflected
2256 if (!SystemDictionary::Parameter_klass_loaded())
2257 method_parameters_length = -1;
2258 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2259 if (method_attribute_length != 0) {
2260 classfile_parse_error(
2261 "Invalid Synthetic method attribute length %u in class file %s",
2262 method_attribute_length, CHECK_(nullHandle));
2263 }
2264 // Should we check that there hasn't already been a synthetic attribute?
2265 access_flags.set_is_synthetic();
2266 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2267 if (method_attribute_length != 0) {
2268 classfile_parse_error(
2269 "Invalid Deprecated method attribute length %u in class file %s",
2270 method_attribute_length, CHECK_(nullHandle));
2271 }
2272 } else if (_major_version >= JAVA_1_5_VERSION) {
2273 if (method_attribute_name == vmSymbols::tag_signature()) {
2274 if (method_attribute_length != 2) {
2275 classfile_parse_error(
2276 "Invalid Signature attribute length %u in class file %s",
2277 method_attribute_length, CHECK_(nullHandle));
2278 }
2279 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2280 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2281 if (runtime_visible_annotations != NULL) {
2282 classfile_parse_error(
2283 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2284 }
2285 runtime_visible_annotations_length = method_attribute_length;
2286 runtime_visible_annotations = cfs->get_u1_buffer();
2287 assert(runtime_visible_annotations != NULL, "null visible annotations");
2288 parse_annotations(runtime_visible_annotations,
2289 runtime_visible_annotations_length, &parsed_annotations,
2290 CHECK_(nullHandle));
2291 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2292 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2293 if (runtime_invisible_annotations_exists) {
2294 classfile_parse_error(
2295 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2296 }
2297 runtime_invisible_annotations_exists = true;
2298 if (PreserveAllAnnotations) {
2299 runtime_invisible_annotations_length = method_attribute_length;
2300 runtime_invisible_annotations = cfs->get_u1_buffer();
2301 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2302 }
2303 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2304 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2305 if (runtime_visible_parameter_annotations != NULL) {
2306 classfile_parse_error(
2307 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2308 }
2309 runtime_visible_parameter_annotations_length = method_attribute_length;
2310 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2311 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2312 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2313 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2314 if (runtime_invisible_parameter_annotations_exists) {
2315 classfile_parse_error(
2316 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2317 }
2318 runtime_invisible_parameter_annotations_exists = true;
2319 if (PreserveAllAnnotations) {
2320 runtime_invisible_parameter_annotations_length = method_attribute_length;
2321 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2322 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2323 }
2324 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2325 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2326 if (annotation_default != NULL) {
2327 classfile_parse_error(
2328 "Multiple AnnotationDefault attributes for method in class file %s",
2329 CHECK_(nullHandle));
2330 }
2331 annotation_default_length = method_attribute_length;
2332 annotation_default = cfs->get_u1_buffer();
2333 assert(annotation_default != NULL, "null annotation default");
2334 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2335 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2336 if (runtime_visible_type_annotations != NULL) {
2337 classfile_parse_error(
2338 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2339 CHECK_(nullHandle));
2340 }
2341 runtime_visible_type_annotations_length = method_attribute_length;
2342 runtime_visible_type_annotations = cfs->get_u1_buffer();
2343 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2344 // No need for the VM to parse Type annotations
2345 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2346 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2347 if (runtime_invisible_type_annotations_exists) {
2348 classfile_parse_error(
2349 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2350 CHECK_(nullHandle));
2351 } else {
2352 runtime_invisible_type_annotations_exists = true;
2353 }
2354 if (PreserveAllAnnotations) {
2355 runtime_invisible_type_annotations_length = method_attribute_length;
2356 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2357 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2358 }
2359 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2360 } else {
2361 // Skip unknown attributes
2362 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2363 }
2364 } else {
2365 // Skip unknown attributes
2366 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2367 }
2368 }
2369
2370 if (linenumber_table != NULL) {
2371 linenumber_table->write_terminator();
2372 linenumber_table_length = linenumber_table->position();
2373 }
2374
2375 // Make sure there's at least one Code attribute in non-native/non-abstract method
2376 if (_need_verify) {
2377 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2378 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2379 }
2380
2381 // All sizing information for a Method* is finally available, now create it
2382 InlineTableSizes sizes(
2383 total_lvt_length,
2384 linenumber_table_length,
2385 exception_table_length,
2386 checked_exceptions_length,
2387 method_parameters_length,
2388 generic_signature_index,
2389 runtime_visible_annotations_length +
2390 runtime_invisible_annotations_length,
2391 runtime_visible_parameter_annotations_length +
2392 runtime_invisible_parameter_annotations_length,
2393 runtime_visible_type_annotations_length +
2394 runtime_invisible_type_annotations_length,
2395 annotation_default_length,
2396 0);
2397
2398 Method* m = Method::allocate(
2399 _loader_data, code_length, access_flags, &sizes,
2400 ConstMethod::NORMAL, CHECK_(nullHandle));
2401
2402 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2403
2404 // Fill in information from fixed part (access_flags already set)
2405 m->set_constants(_cp);
2406 m->set_name_index(name_index);
2407 m->set_signature_index(signature_index);
2408 #ifdef CC_INTERP
2409 // hmm is there a gc issue here??
2410 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2411 m->set_result_index(rtf.type());
2412 #endif
2413
2414 if (args_size >= 0) {
2415 m->set_size_of_parameters(args_size);
2416 } else {
2417 m->compute_size_of_parameters(THREAD);
2418 }
2419 #ifdef ASSERT
2420 if (args_size >= 0) {
2421 m->compute_size_of_parameters(THREAD);
2422 assert(args_size == m->size_of_parameters(), "");
2423 }
2424 #endif
2425
2426 // Fill in code attribute information
2427 m->set_max_stack(max_stack);
2428 m->set_max_locals(max_locals);
2429 if (stackmap_data != NULL) {
2430 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2431 stackmap_data_length, CHECK_NULL);
2432 }
2433
2434 // Copy byte codes
2435 m->set_code(code_start);
2436
2437 // Copy line number table
2438 if (linenumber_table != NULL) {
2439 memcpy(m->compressed_linenumber_table(),
2440 linenumber_table->buffer(), linenumber_table_length);
2441 }
2442
2443 // Copy exception table
2444 if (exception_table_length > 0) {
2445 int size =
2446 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2447 copy_u2_with_conversion((u2*) m->exception_table_start(),
2448 exception_table_start, size);
2449 }
2450
2451 // Copy method parameters
2452 if (method_parameters_length > 0) {
2453 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2454 for (int i = 0; i < method_parameters_length; i++) {
2455 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2456 method_parameters_data += 2;
2457 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2458 method_parameters_data += 2;
2459 }
2460 }
2461
2462 // Copy checked exceptions
2463 if (checked_exceptions_length > 0) {
2464 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2465 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2466 }
2467
2468 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2469 if (total_lvt_length > 0) {
2470 promoted_flags->set_has_localvariable_table();
2471 copy_localvariable_table(m->constMethod(), lvt_cnt,
2472 localvariable_table_length,
2473 localvariable_table_start,
2474 lvtt_cnt,
2475 localvariable_type_table_length,
2476 localvariable_type_table_start, CHECK_NULL);
2477 }
2478
2479 if (parsed_annotations.has_any_annotations())
2480 parsed_annotations.apply_to(m);
2481
2482 // Copy annotations
2483 copy_method_annotations(m->constMethod(),
2484 runtime_visible_annotations,
2485 runtime_visible_annotations_length,
2486 runtime_invisible_annotations,
2487 runtime_invisible_annotations_length,
2488 runtime_visible_parameter_annotations,
2489 runtime_visible_parameter_annotations_length,
2490 runtime_invisible_parameter_annotations,
2491 runtime_invisible_parameter_annotations_length,
2492 runtime_visible_type_annotations,
2493 runtime_visible_type_annotations_length,
2494 runtime_invisible_type_annotations,
2495 runtime_invisible_type_annotations_length,
2496 annotation_default,
2497 annotation_default_length,
2498 CHECK_NULL);
2499
2500 if (name == vmSymbols::finalize_method_name() &&
2501 signature == vmSymbols::void_method_signature()) {
2502 if (m->is_empty_method()) {
2503 _has_empty_finalizer = true;
2504 } else {
2505 _has_finalizer = true;
2506 }
2507 }
2508 if (name == vmSymbols::object_initializer_name() &&
2509 signature == vmSymbols::void_method_signature() &&
2510 m->is_vanilla_constructor()) {
2511 _has_vanilla_constructor = true;
2512 }
2513
2514 NOT_PRODUCT(m->verify());
2515 return m;
2516 }
2517
2518
2519 // The promoted_flags parameter is used to pass relevant access_flags
2520 // from the methods back up to the containing klass. These flag values
2521 // are added to klass's access_flags.
2522
2523 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2524 AccessFlags* promoted_flags,
2525 bool* has_final_method,
2526 bool* declares_default_methods,
2527 TRAPS) {
2528 ClassFileStream* cfs = stream();
2529 cfs->guarantee_more(2, CHECK_NULL); // length
2530 u2 length = cfs->get_u2_fast();
2531 if (length == 0) {
2532 _methods = Universe::the_empty_method_array();
2533 } else {
2534 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2535
2536 HandleMark hm(THREAD);
2537 for (int index = 0; index < length; index++) {
2538 methodHandle method = parse_method(is_interface,
2539 promoted_flags,
2540 CHECK_NULL);
2541
2542 if (method->is_final()) {
2543 *has_final_method = true;
2544 }
2545 // declares_default_methods: declares concrete instance methods, any access flags
2546 // used for interface initialization, and default method inheritance analysis
2547 if (is_interface && !(*declares_default_methods)
2548 && !method->is_abstract() && !method->is_static()) {
2549 *declares_default_methods = true;
2550 }
2551 _methods->at_put(index, method());
2552 }
2553
2554 if (_need_verify && length > 1) {
2555 // Check duplicated methods
2556 ResourceMark rm(THREAD);
2557 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2558 THREAD, NameSigHash*, HASH_ROW_SIZE);
2559 initialize_hashtable(names_and_sigs);
2560 bool dup = false;
2561 {
2562 debug_only(No_Safepoint_Verifier nsv;)
2563 for (int i = 0; i < length; i++) {
2564 Method* m = _methods->at(i);
2565 // If no duplicates, add name/signature in hashtable names_and_sigs.
2566 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2567 dup = true;
2568 break;
2569 }
2570 }
2571 }
2572 if (dup) {
2573 classfile_parse_error("Duplicate method name&signature in class file %s",
2574 CHECK_NULL);
2575 }
2576 }
2577 }
2578 return _methods;
2579 }
2580
2581
2582 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2583 int length = methods->length();
2584 // If JVMTI original method ordering or sharing is enabled we have to
2585 // remember the original class file ordering.
2586 // We temporarily use the vtable_index field in the Method* to store the
2587 // class file index, so we can read in after calling qsort.
2588 // Put the method ordering in the shared archive.
2589 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2590 for (int index = 0; index < length; index++) {
2591 Method* m = methods->at(index);
2592 assert(!m->valid_vtable_index(), "vtable index should not be set");
2593 m->set_vtable_index(index);
2594 }
2595 }
2596 // Sort method array by ascending method name (for faster lookups & vtable construction)
2597 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2598 Method::sort_methods(methods);
2599
2600 intArray* method_ordering = NULL;
2601 // If JVMTI original method ordering or sharing is enabled construct int
2602 // array remembering the original ordering
2603 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2604 method_ordering = new intArray(length);
2605 for (int index = 0; index < length; index++) {
2606 Method* m = methods->at(index);
2607 int old_index = m->vtable_index();
2608 assert(old_index >= 0 && old_index < length, "invalid method index");
2609 method_ordering->at_put(index, old_index);
2610 m->set_vtable_index(Method::invalid_vtable_index);
2611 }
2612 }
2613 return method_ordering;
2614 }
2615
2616 // Parse generic_signature attribute for methods and fields
2617 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2618 ClassFileStream* cfs = stream();
2619 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2620 u2 generic_signature_index = cfs->get_u2_fast();
2621 check_property(
2622 valid_symbol_at(generic_signature_index),
2623 "Invalid Signature attribute at constant pool index %u in class file %s",
2624 generic_signature_index, CHECK_0);
2625 return generic_signature_index;
2626 }
2627
2628 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2629 ClassFileStream* cfs = stream();
2630 cfs->guarantee_more(2, CHECK); // sourcefile_index
2631 u2 sourcefile_index = cfs->get_u2_fast();
2632 check_property(
2633 valid_symbol_at(sourcefile_index),
2634 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2635 sourcefile_index, CHECK);
2636 set_class_sourcefile_index(sourcefile_index);
2637 }
2638
2639
2640
2641 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2642 ClassFileStream* cfs = stream();
2643 u1* sde_buffer = cfs->get_u1_buffer();
2644 assert(sde_buffer != NULL, "null sde buffer");
2645
2646 // Don't bother storing it if there is no way to retrieve it
2647 if (JvmtiExport::can_get_source_debug_extension()) {
2648 assert((length+1) > length, "Overflow checking");
2649 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2650 for (int i = 0; i < length; i++) {
2651 sde[i] = sde_buffer[i];
2652 }
2653 sde[length] = '\0';
2654 set_class_sde_buffer((char*)sde, length);
2655 }
2656 // Got utf8 string, set stream position forward
2657 cfs->skip_u1(length, CHECK);
2658 }
2659
2660
2661 // Inner classes can be static, private or protected (classic VM does this)
2662 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2663
2664 // Return number of classes in the inner classes attribute table
2665 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2666 bool parsed_enclosingmethod_attribute,
2667 u2 enclosing_method_class_index,
2668 u2 enclosing_method_method_index,
2669 TRAPS) {
2670 ClassFileStream* cfs = stream();
2671 u1* current_mark = cfs->current();
2672 u2 length = 0;
2673 if (inner_classes_attribute_start != NULL) {
2674 cfs->set_current(inner_classes_attribute_start);
2675 cfs->guarantee_more(2, CHECK_0); // length
2676 length = cfs->get_u2_fast();
2677 }
2678
2679 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2680 // method data:
2681 // [inner_class_info_index,
2682 // outer_class_info_index,
2683 // inner_name_index,
2684 // inner_class_access_flags,
2685 // ...
2686 // enclosing_method_class_index,
2687 // enclosing_method_method_index]
2688 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2689 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2690 _inner_classes = inner_classes;
2691
2692 int index = 0;
2693 int cp_size = _cp->length();
2694 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2695 for (int n = 0; n < length; n++) {
2696 // Inner class index
2697 u2 inner_class_info_index = cfs->get_u2_fast();
2698 check_property(
2699 inner_class_info_index == 0 ||
2700 valid_klass_reference_at(inner_class_info_index),
2701 "inner_class_info_index %u has bad constant type in class file %s",
2702 inner_class_info_index, CHECK_0);
2703 // Outer class index
2704 u2 outer_class_info_index = cfs->get_u2_fast();
2705 check_property(
2706 outer_class_info_index == 0 ||
2707 valid_klass_reference_at(outer_class_info_index),
2708 "outer_class_info_index %u has bad constant type in class file %s",
2709 outer_class_info_index, CHECK_0);
2710 // Inner class name
2711 u2 inner_name_index = cfs->get_u2_fast();
2712 check_property(
2713 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2714 "inner_name_index %u has bad constant type in class file %s",
2715 inner_name_index, CHECK_0);
2716 if (_need_verify) {
2717 guarantee_property(inner_class_info_index != outer_class_info_index,
2718 "Class is both outer and inner class in class file %s", CHECK_0);
2719 }
2720 // Access flags
2721 AccessFlags inner_access_flags;
2722 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2723 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2724 // Set abstract bit for old class files for backward compatibility
2725 flags |= JVM_ACC_ABSTRACT;
2726 }
2727 verify_legal_class_modifiers(flags, CHECK_0);
2728 inner_access_flags.set_flags(flags);
2729
2730 inner_classes->at_put(index++, inner_class_info_index);
2731 inner_classes->at_put(index++, outer_class_info_index);
2732 inner_classes->at_put(index++, inner_name_index);
2733 inner_classes->at_put(index++, inner_access_flags.as_short());
2734 }
2735
2736 // 4347400: make sure there's no duplicate entry in the classes array
2737 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2738 for(int i = 0; i < length * 4; i += 4) {
2739 for(int j = i + 4; j < length * 4; j += 4) {
2740 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2741 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2742 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2743 inner_classes->at(i+3) != inner_classes->at(j+3)),
2744 "Duplicate entry in InnerClasses in class file %s",
2745 CHECK_0);
2746 }
2747 }
2748 }
2749
2750 // Set EnclosingMethod class and method indexes.
2751 if (parsed_enclosingmethod_attribute) {
2752 inner_classes->at_put(index++, enclosing_method_class_index);
2753 inner_classes->at_put(index++, enclosing_method_method_index);
2754 }
2755 assert(index == size, "wrong size");
2756
2757 // Restore buffer's current position.
2758 cfs->set_current(current_mark);
2759
2760 return length;
2761 }
2762
2763 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2764 set_class_synthetic_flag(true);
2765 }
2766
2767 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2768 ClassFileStream* cfs = stream();
2769 u2 signature_index = cfs->get_u2(CHECK);
2770 check_property(
2771 valid_symbol_at(signature_index),
2772 "Invalid constant pool index %u in Signature attribute in class file %s",
2773 signature_index, CHECK);
2774 set_class_generic_signature_index(signature_index);
2775 }
2776
2777 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2778 ClassFileStream* cfs = stream();
2779 u1* current_start = cfs->current();
2780
2781 guarantee_property(attribute_byte_length >= sizeof(u2),
2782 "Invalid BootstrapMethods attribute length %u in class file %s",
2783 attribute_byte_length,
2784 CHECK);
2785
2786 cfs->guarantee_more(attribute_byte_length, CHECK);
2787
2788 int attribute_array_length = cfs->get_u2_fast();
2789
2790 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2791 "Short length on BootstrapMethods in class file %s",
2792 CHECK);
2793
2794
2795 // The attribute contains a counted array of counted tuples of shorts,
2796 // represending bootstrap specifiers:
2797 // length*{bootstrap_method_index, argument_count*{argument_index}}
2798 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2799 // operand_count = number of shorts in attr, except for leading length
2800
2801 // The attribute is copied into a short[] array.
2802 // The array begins with a series of short[2] pairs, one for each tuple.
2803 int index_size = (attribute_array_length * 2);
2804
2805 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2806
2807 // Eagerly assign operands so they will be deallocated with the constant
2808 // pool if there is an error.
2809 _cp->set_operands(operands);
2810
2811 int operand_fill_index = index_size;
2812 int cp_size = _cp->length();
2813
2814 for (int n = 0; n < attribute_array_length; n++) {
2815 // Store a 32-bit offset into the header of the operand array.
2816 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2817
2818 // Read a bootstrap specifier.
2819 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2820 u2 bootstrap_method_index = cfs->get_u2_fast();
2821 u2 argument_count = cfs->get_u2_fast();
2822 check_property(
2823 valid_cp_range(bootstrap_method_index, cp_size) &&
2824 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2825 "bootstrap_method_index %u has bad constant type in class file %s",
2826 bootstrap_method_index,
2827 CHECK);
2828
2829 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2830 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2831 CHECK);
2832
2833 operands->at_put(operand_fill_index++, bootstrap_method_index);
2834 operands->at_put(operand_fill_index++, argument_count);
2835
2836 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2837 for (int j = 0; j < argument_count; j++) {
2838 u2 argument_index = cfs->get_u2_fast();
2839 check_property(
2840 valid_cp_range(argument_index, cp_size) &&
2841 _cp->tag_at(argument_index).is_loadable_constant(),
2842 "argument_index %u has bad constant type in class file %s",
2843 argument_index,
2844 CHECK);
2845 operands->at_put(operand_fill_index++, argument_index);
2846 }
2847 }
2848
2849 u1* current_end = cfs->current();
2850 guarantee_property(current_end == current_start + attribute_byte_length,
2851 "Bad length on BootstrapMethods in class file %s",
2852 CHECK);
2853 }
2854
2855 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2856 TRAPS) {
2857 ClassFileStream* cfs = stream();
2858 // Set inner classes attribute to default sentinel
2859 _inner_classes = Universe::the_empty_short_array();
2860 cfs->guarantee_more(2, CHECK); // attributes_count
2861 u2 attributes_count = cfs->get_u2_fast();
2862 bool parsed_sourcefile_attribute = false;
2863 bool parsed_innerclasses_attribute = false;
2864 bool parsed_enclosingmethod_attribute = false;
2865 bool parsed_bootstrap_methods_attribute = false;
2866 u1* runtime_visible_annotations = NULL;
2867 int runtime_visible_annotations_length = 0;
2868 u1* runtime_invisible_annotations = NULL;
2869 int runtime_invisible_annotations_length = 0;
2870 u1* runtime_visible_type_annotations = NULL;
2871 int runtime_visible_type_annotations_length = 0;
2872 u1* runtime_invisible_type_annotations = NULL;
2873 int runtime_invisible_type_annotations_length = 0;
2874 bool runtime_invisible_type_annotations_exists = false;
2875 bool runtime_invisible_annotations_exists = false;
2876 bool parsed_source_debug_ext_annotations_exist = false;
2877 u1* inner_classes_attribute_start = NULL;
2878 u4 inner_classes_attribute_length = 0;
2879 u2 enclosing_method_class_index = 0;
2880 u2 enclosing_method_method_index = 0;
2881 // Iterate over attributes
2882 while (attributes_count--) {
2883 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2884 u2 attribute_name_index = cfs->get_u2_fast();
2885 u4 attribute_length = cfs->get_u4_fast();
2886 check_property(
2887 valid_symbol_at(attribute_name_index),
2888 "Attribute name has bad constant pool index %u in class file %s",
2889 attribute_name_index, CHECK);
2890 Symbol* tag = _cp->symbol_at(attribute_name_index);
2891 if (tag == vmSymbols::tag_source_file()) {
2892 // Check for SourceFile tag
2893 if (_need_verify) {
2894 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2895 }
2896 if (parsed_sourcefile_attribute) {
2897 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2898 } else {
2899 parsed_sourcefile_attribute = true;
2900 }
2901 parse_classfile_sourcefile_attribute(CHECK);
2902 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2903 // Check for SourceDebugExtension tag
2904 if (parsed_source_debug_ext_annotations_exist) {
2905 classfile_parse_error(
2906 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2907 }
2908 parsed_source_debug_ext_annotations_exist = true;
2909 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2910 } else if (tag == vmSymbols::tag_inner_classes()) {
2911 // Check for InnerClasses tag
2912 if (parsed_innerclasses_attribute) {
2913 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2914 } else {
2915 parsed_innerclasses_attribute = true;
2916 }
2917 inner_classes_attribute_start = cfs->get_u1_buffer();
2918 inner_classes_attribute_length = attribute_length;
2919 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2920 } else if (tag == vmSymbols::tag_synthetic()) {
2921 // Check for Synthetic tag
2922 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2923 if (attribute_length != 0) {
2924 classfile_parse_error(
2925 "Invalid Synthetic classfile attribute length %u in class file %s",
2926 attribute_length, CHECK);
2927 }
2928 parse_classfile_synthetic_attribute(CHECK);
2929 } else if (tag == vmSymbols::tag_deprecated()) {
2930 // Check for Deprecatd tag - 4276120
2931 if (attribute_length != 0) {
2932 classfile_parse_error(
2933 "Invalid Deprecated classfile attribute length %u in class file %s",
2934 attribute_length, CHECK);
2935 }
2936 } else if (_major_version >= JAVA_1_5_VERSION) {
2937 if (tag == vmSymbols::tag_signature()) {
2938 if (attribute_length != 2) {
2939 classfile_parse_error(
2940 "Wrong Signature attribute length %u in class file %s",
2941 attribute_length, CHECK);
2942 }
2943 parse_classfile_signature_attribute(CHECK);
2944 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2945 if (runtime_visible_annotations != NULL) {
2946 classfile_parse_error(
2947 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2948 }
2949 runtime_visible_annotations_length = attribute_length;
2950 runtime_visible_annotations = cfs->get_u1_buffer();
2951 assert(runtime_visible_annotations != NULL, "null visible annotations");
2952 parse_annotations(runtime_visible_annotations,
2953 runtime_visible_annotations_length,
2954 parsed_annotations,
2955 CHECK);
2956 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2957 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2958 if (runtime_invisible_annotations_exists) {
2959 classfile_parse_error(
2960 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2961 }
2962 runtime_invisible_annotations_exists = true;
2963 if (PreserveAllAnnotations) {
2964 runtime_invisible_annotations_length = attribute_length;
2965 runtime_invisible_annotations = cfs->get_u1_buffer();
2966 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2967 }
2968 cfs->skip_u1(attribute_length, CHECK);
2969 } else if (tag == vmSymbols::tag_enclosing_method()) {
2970 if (parsed_enclosingmethod_attribute) {
2971 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2972 } else {
2973 parsed_enclosingmethod_attribute = true;
2974 }
2975 guarantee_property(attribute_length == 4,
2976 "Wrong EnclosingMethod attribute length %u in class file %s",
2977 attribute_length, CHECK);
2978 cfs->guarantee_more(4, CHECK); // class_index, method_index
2979 enclosing_method_class_index = cfs->get_u2_fast();
2980 enclosing_method_method_index = cfs->get_u2_fast();
2981 if (enclosing_method_class_index == 0) {
2982 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2983 }
2984 // Validate the constant pool indices and types
2985 check_property(valid_klass_reference_at(enclosing_method_class_index),
2986 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2987 if (enclosing_method_method_index != 0 &&
2988 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2989 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2990 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2991 }
2992 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2993 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2994 if (parsed_bootstrap_methods_attribute)
2995 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2996 parsed_bootstrap_methods_attribute = true;
2997 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2998 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2999 if (runtime_visible_type_annotations != NULL) {
3000 classfile_parse_error(
3001 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3002 }
3003 runtime_visible_type_annotations_length = attribute_length;
3004 runtime_visible_type_annotations = cfs->get_u1_buffer();
3005 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3006 // No need for the VM to parse Type annotations
3007 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3008 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3009 if (runtime_invisible_type_annotations_exists) {
3010 classfile_parse_error(
3011 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3012 } else {
3013 runtime_invisible_type_annotations_exists = true;
3014 }
3015 if (PreserveAllAnnotations) {
3016 runtime_invisible_type_annotations_length = attribute_length;
3017 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3018 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3019 }
3020 cfs->skip_u1(attribute_length, CHECK);
3021 } else {
3022 // Unknown attribute
3023 cfs->skip_u1(attribute_length, CHECK);
3024 }
3025 } else {
3026 // Unknown attribute
3027 cfs->skip_u1(attribute_length, CHECK);
3028 }
3029 }
3030 _annotations = assemble_annotations(runtime_visible_annotations,
3031 runtime_visible_annotations_length,
3032 runtime_invisible_annotations,
3033 runtime_invisible_annotations_length,
3034 CHECK);
3035 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3036 runtime_visible_type_annotations_length,
3037 runtime_invisible_type_annotations,
3038 runtime_invisible_type_annotations_length,
3039 CHECK);
3040
3041 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3042 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3043 inner_classes_attribute_start,
3044 parsed_innerclasses_attribute,
3045 enclosing_method_class_index,
3046 enclosing_method_method_index,
3047 CHECK);
3048 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3049 guarantee_property(
3050 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3051 "Wrong InnerClasses attribute length in class file %s", CHECK);
3052 }
3053 }
3054
3055 if (_max_bootstrap_specifier_index >= 0) {
3056 guarantee_property(parsed_bootstrap_methods_attribute,
3057 "Missing BootstrapMethods attribute in class file %s", CHECK);
3058 }
3059 }
3060
3061 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3062 if (_synthetic_flag)
3063 k->set_is_synthetic();
3064 if (_sourcefile_index != 0) {
3065 k->set_source_file_name_index(_sourcefile_index);
3066 }
3067 if (_generic_signature_index != 0) {
3068 k->set_generic_signature_index(_generic_signature_index);
3069 }
3070 if (_sde_buffer != NULL) {
3071 k->set_source_debug_extension(_sde_buffer, _sde_length);
3072 }
3073 }
3074
3075 // Create the Annotations object that will
3076 // hold the annotations array for the Klass.
3077 void ClassFileParser::create_combined_annotations(TRAPS) {
3078 if (_annotations == NULL &&
3079 _type_annotations == NULL &&
3080 _fields_annotations == NULL &&
3081 _fields_type_annotations == NULL) {
3082 // Don't create the Annotations object unnecessarily.
3083 return;
3084 }
3085
3086 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3087 annotations->set_class_annotations(_annotations);
3088 annotations->set_class_type_annotations(_type_annotations);
3089 annotations->set_fields_annotations(_fields_annotations);
3090 annotations->set_fields_type_annotations(_fields_type_annotations);
3091
3092 // This is the Annotations object that will be
3093 // assigned to InstanceKlass being constructed.
3094 _combined_annotations = annotations;
3095
3096 // The annotations arrays below has been transfered the
3097 // _combined_annotations so these fields can now be cleared.
3098 _annotations = NULL;
3099 _type_annotations = NULL;
3100 _fields_annotations = NULL;
3101 _fields_type_annotations = NULL;
3102 }
3103
3104 // Transfer ownership of metadata allocated to the InstanceKlass.
3105 void ClassFileParser::apply_parsed_class_metadata(
3106 instanceKlassHandle this_klass,
3107 int java_fields_count, TRAPS) {
3108 _cp->set_pool_holder(this_klass());
3109 this_klass->set_constants(_cp);
3110 this_klass->set_fields(_fields, java_fields_count);
3111 this_klass->set_methods(_methods);
3112 this_klass->set_inner_classes(_inner_classes);
3113 this_klass->set_local_interfaces(_local_interfaces);
3114 this_klass->set_transitive_interfaces(_transitive_interfaces);
3115 this_klass->set_annotations(_combined_annotations);
3116
3117 // Clear out these fields so they don't get deallocated by the destructor
3118 clear_class_metadata();
3119 }
3120
3121 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3122 int runtime_visible_annotations_length,
3123 u1* runtime_invisible_annotations,
3124 int runtime_invisible_annotations_length, TRAPS) {
3125 AnnotationArray* annotations = NULL;
3126 if (runtime_visible_annotations != NULL ||
3127 runtime_invisible_annotations != NULL) {
3128 annotations = MetadataFactory::new_array<u1>(_loader_data,
3129 runtime_visible_annotations_length +
3130 runtime_invisible_annotations_length,
3131 CHECK_(annotations));
3132 if (runtime_visible_annotations != NULL) {
3133 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3134 annotations->at_put(i, runtime_visible_annotations[i]);
3135 }
3136 }
3137 if (runtime_invisible_annotations != NULL) {
3138 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3139 int append = runtime_visible_annotations_length+i;
3140 annotations->at_put(append, runtime_invisible_annotations[i]);
3141 }
3142 }
3143 }
3144 return annotations;
3145 }
3146
3147 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3148 TRAPS) {
3149 instanceKlassHandle super_klass;
3150 if (super_class_index == 0) {
3151 check_property(_class_name == vmSymbols::java_lang_Object(),
3152 "Invalid superclass index %u in class file %s",
3153 super_class_index,
3154 CHECK_NULL);
3155 } else {
3156 check_property(valid_klass_reference_at(super_class_index),
3157 "Invalid superclass index %u in class file %s",
3158 super_class_index,
3159 CHECK_NULL);
3160 // The class name should be legal because it is checked when parsing constant pool.
3161 // However, make sure it is not an array type.
3162 bool is_array = false;
3163 if (_cp->tag_at(super_class_index).is_klass()) {
3164 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3165 if (_need_verify)
3166 is_array = super_klass->oop_is_array();
3167 } else if (_need_verify) {
3168 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3169 }
3170 if (_need_verify) {
3171 guarantee_property(!is_array,
3172 "Bad superclass name in class file %s", CHECK_NULL);
3173 }
3174 }
3175 return super_klass;
3176 }
3177
3178
3179 // Values needed for oopmap and InstanceKlass creation
3180 class FieldLayoutInfo : public StackObj {
3181 public:
3182 int* nonstatic_oop_offsets;
3183 unsigned int* nonstatic_oop_counts;
3184 unsigned int nonstatic_oop_map_count;
3185 unsigned int total_oop_map_count;
3186 int instance_size;
3187 int nonstatic_field_size;
3188 int static_field_size;
3189 bool has_nonstatic_fields;
3190 };
3191
3192 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3193 void ClassFileParser::layout_fields(Handle class_loader,
3194 FieldAllocationCount* fac,
3195 ClassAnnotationCollector* parsed_annotations,
3196 FieldLayoutInfo* info,
3197 TRAPS) {
3198
3199 // Field size and offset computation
3200 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3201 int next_static_oop_offset;
3202 int next_static_double_offset;
3203 int next_static_word_offset;
3204 int next_static_short_offset;
3205 int next_static_byte_offset;
3206 int next_nonstatic_oop_offset;
3207 int next_nonstatic_double_offset;
3208 int next_nonstatic_word_offset;
3209 int next_nonstatic_short_offset;
3210 int next_nonstatic_byte_offset;
3211 int first_nonstatic_oop_offset;
3212 int next_nonstatic_field_offset;
3213 int next_nonstatic_padded_offset;
3214
3215 // Count the contended fields by type.
3216 //
3217 // We ignore static fields, because @Contended is not supported for them.
3218 // The layout code below will also ignore the static fields.
3219 int nonstatic_contended_count = 0;
3220 FieldAllocationCount fac_contended;
3221 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3222 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3223 if (fs.is_contended()) {
3224 fac_contended.count[atype]++;
3225 if (!fs.access_flags().is_static()) {
3226 nonstatic_contended_count++;
3227 }
3228 }
3229 }
3230
3231
3232 // Calculate the starting byte offsets
3233 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3234 next_static_double_offset = next_static_oop_offset +
3235 ((fac->count[STATIC_OOP]) * heapOopSize);
3236 if ( fac->count[STATIC_DOUBLE] &&
3237 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3238 Universe::field_type_should_be_aligned(T_LONG)) ) {
3239 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3240 }
3241
3242 next_static_word_offset = next_static_double_offset +
3243 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3244 next_static_short_offset = next_static_word_offset +
3245 ((fac->count[STATIC_WORD]) * BytesPerInt);
3246 next_static_byte_offset = next_static_short_offset +
3247 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3248
3249 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3250 nonstatic_field_size * heapOopSize;
3251
3252 next_nonstatic_field_offset = nonstatic_fields_start;
3253
3254 bool is_contended_class = parsed_annotations->is_contended();
3255
3256 // Class is contended, pad before all the fields
3257 if (is_contended_class) {
3258 next_nonstatic_field_offset += ContendedPaddingWidth;
3259 }
3260
3261 // Compute the non-contended fields count.
3262 // The packing code below relies on these counts to determine if some field
3263 // can be squeezed into the alignment gap. Contended fields are obviously
3264 // exempt from that.
3265 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3266 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3267 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3268 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3269 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3270
3271 // Total non-static fields count, including every contended field
3272 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3273 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3274 fac->count[NONSTATIC_OOP];
3275
3276 bool super_has_nonstatic_fields =
3277 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3278 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3279
3280
3281 // Prepare list of oops for oop map generation.
3282 //
3283 // "offset" and "count" lists are describing the set of contiguous oop
3284 // regions. offset[i] is the start of the i-th region, which then has
3285 // count[i] oops following. Before we know how many regions are required,
3286 // we pessimistically allocate the maps to fit all the oops into the
3287 // distinct regions.
3288 //
3289 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3290 // to figure out if we still need to do this.
3291 int* nonstatic_oop_offsets;
3292 unsigned int* nonstatic_oop_counts;
3293 unsigned int nonstatic_oop_map_count = 0;
3294 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3295
3296 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3297 THREAD, int, max_nonstatic_oop_maps);
3298 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3299 THREAD, unsigned int, max_nonstatic_oop_maps);
3300
3301 first_nonstatic_oop_offset = 0; // will be set for first oop field
3302
3303 bool compact_fields = CompactFields;
3304 int allocation_style = FieldsAllocationStyle;
3305 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3306 assert(false, "0 <= FieldsAllocationStyle <= 2");
3307 allocation_style = 1; // Optimistic
3308 }
3309
3310 // The next classes have predefined hard-coded fields offsets
3311 // (see in JavaClasses::compute_hard_coded_offsets()).
3312 // Use default fields allocation order for them.
3313 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3314 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3315 _class_name == vmSymbols::java_lang_Class() ||
3316 _class_name == vmSymbols::java_lang_ClassLoader() ||
3317 _class_name == vmSymbols::java_lang_ref_Reference() ||
3318 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3319 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3320 _class_name == vmSymbols::java_lang_String() ||
3321 _class_name == vmSymbols::java_lang_Throwable() ||
3322 _class_name == vmSymbols::java_lang_Boolean() ||
3323 _class_name == vmSymbols::java_lang_Character() ||
3324 _class_name == vmSymbols::java_lang_Float() ||
3325 _class_name == vmSymbols::java_lang_Double() ||
3326 _class_name == vmSymbols::java_lang_Byte() ||
3327 _class_name == vmSymbols::java_lang_Short() ||
3328 _class_name == vmSymbols::java_lang_Integer() ||
3329 _class_name == vmSymbols::java_lang_Long())) {
3330 allocation_style = 0; // Allocate oops first
3331 compact_fields = false; // Don't compact fields
3332 }
3333
3334 // Rearrange fields for a given allocation style
3335 if( allocation_style == 0 ) {
3336 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3337 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3338 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3339 (nonstatic_oop_count * heapOopSize);
3340 } else if( allocation_style == 1 ) {
3341 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3342 next_nonstatic_double_offset = next_nonstatic_field_offset;
3343 } else if( allocation_style == 2 ) {
3344 // Fields allocation: oops fields in super and sub classes are together.
3345 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3346 _super_klass->nonstatic_oop_map_size() > 0 ) {
3347 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3348 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3349 OopMapBlock* last_map = first_map + map_count - 1;
3350 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3351 if (next_offset == next_nonstatic_field_offset) {
3352 allocation_style = 0; // allocate oops first
3353 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3354 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3355 (nonstatic_oop_count * heapOopSize);
3356 }
3357 }
3358 if( allocation_style == 2 ) {
3359 allocation_style = 1; // allocate oops last
3360 next_nonstatic_double_offset = next_nonstatic_field_offset;
3361 }
3362 } else {
3363 ShouldNotReachHere();
3364 }
3365
3366 int nonstatic_oop_space_count = 0;
3367 int nonstatic_word_space_count = 0;
3368 int nonstatic_short_space_count = 0;
3369 int nonstatic_byte_space_count = 0;
3370 int nonstatic_oop_space_offset;
3371 int nonstatic_word_space_offset;
3372 int nonstatic_short_space_offset;
3373 int nonstatic_byte_space_offset;
3374
3375 // Try to squeeze some of the fields into the gaps due to
3376 // long/double alignment.
3377 if( nonstatic_double_count > 0 ) {
3378 int offset = next_nonstatic_double_offset;
3379 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3380 if( compact_fields && offset != next_nonstatic_double_offset ) {
3381 // Allocate available fields into the gap before double field.
3382 int length = next_nonstatic_double_offset - offset;
3383 assert(length == BytesPerInt, "");
3384 nonstatic_word_space_offset = offset;
3385 if( nonstatic_word_count > 0 ) {
3386 nonstatic_word_count -= 1;
3387 nonstatic_word_space_count = 1; // Only one will fit
3388 length -= BytesPerInt;
3389 offset += BytesPerInt;
3390 }
3391 nonstatic_short_space_offset = offset;
3392 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3393 nonstatic_short_count -= 1;
3394 nonstatic_short_space_count += 1;
3395 length -= BytesPerShort;
3396 offset += BytesPerShort;
3397 }
3398 nonstatic_byte_space_offset = offset;
3399 while( length > 0 && nonstatic_byte_count > 0 ) {
3400 nonstatic_byte_count -= 1;
3401 nonstatic_byte_space_count += 1;
3402 length -= 1;
3403 }
3404 // Allocate oop field in the gap if there are no other fields for that.
3405 nonstatic_oop_space_offset = offset;
3406 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3407 allocation_style != 0 ) { // when oop fields not first
3408 nonstatic_oop_count -= 1;
3409 nonstatic_oop_space_count = 1; // Only one will fit
3410 length -= heapOopSize;
3411 offset += heapOopSize;
3412 }
3413 }
3414 }
3415
3416 next_nonstatic_word_offset = next_nonstatic_double_offset +
3417 (nonstatic_double_count * BytesPerLong);
3418 next_nonstatic_short_offset = next_nonstatic_word_offset +
3419 (nonstatic_word_count * BytesPerInt);
3420 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3421 (nonstatic_short_count * BytesPerShort);
3422 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3423 nonstatic_byte_count;
3424
3425 // let oops jump before padding with this allocation style
3426 if( allocation_style == 1 ) {
3427 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3428 if( nonstatic_oop_count > 0 ) {
3429 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3430 }
3431 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3432 }
3433
3434 // Iterate over fields again and compute correct offsets.
3435 // The field allocation type was temporarily stored in the offset slot.
3436 // oop fields are located before non-oop fields (static and non-static).
3437 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3438
3439 // skip already laid out fields
3440 if (fs.is_offset_set()) continue;
3441
3442 // contended instance fields are handled below
3443 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3444
3445 int real_offset;
3446 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3447
3448 // pack the rest of the fields
3449 switch (atype) {
3450 case STATIC_OOP:
3451 real_offset = next_static_oop_offset;
3452 next_static_oop_offset += heapOopSize;
3453 break;
3454 case STATIC_BYTE:
3455 real_offset = next_static_byte_offset;
3456 next_static_byte_offset += 1;
3457 break;
3458 case STATIC_SHORT:
3459 real_offset = next_static_short_offset;
3460 next_static_short_offset += BytesPerShort;
3461 break;
3462 case STATIC_WORD:
3463 real_offset = next_static_word_offset;
3464 next_static_word_offset += BytesPerInt;
3465 break;
3466 case STATIC_DOUBLE:
3467 real_offset = next_static_double_offset;
3468 next_static_double_offset += BytesPerLong;
3469 break;
3470 case NONSTATIC_OOP:
3471 if( nonstatic_oop_space_count > 0 ) {
3472 real_offset = nonstatic_oop_space_offset;
3473 nonstatic_oop_space_offset += heapOopSize;
3474 nonstatic_oop_space_count -= 1;
3475 } else {
3476 real_offset = next_nonstatic_oop_offset;
3477 next_nonstatic_oop_offset += heapOopSize;
3478 }
3479
3480 // Record this oop in the oop maps
3481 if( nonstatic_oop_map_count > 0 &&
3482 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3483 real_offset -
3484 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3485 heapOopSize ) {
3486 // This oop is adjacent to the previous one, add to current oop map
3487 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3488 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3489 } else {
3490 // This oop is not adjacent to the previous one, create new oop map
3491 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3492 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3493 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3494 nonstatic_oop_map_count += 1;
3495 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3496 first_nonstatic_oop_offset = real_offset;
3497 }
3498 }
3499 break;
3500 case NONSTATIC_BYTE:
3501 if( nonstatic_byte_space_count > 0 ) {
3502 real_offset = nonstatic_byte_space_offset;
3503 nonstatic_byte_space_offset += 1;
3504 nonstatic_byte_space_count -= 1;
3505 } else {
3506 real_offset = next_nonstatic_byte_offset;
3507 next_nonstatic_byte_offset += 1;
3508 }
3509 break;
3510 case NONSTATIC_SHORT:
3511 if( nonstatic_short_space_count > 0 ) {
3512 real_offset = nonstatic_short_space_offset;
3513 nonstatic_short_space_offset += BytesPerShort;
3514 nonstatic_short_space_count -= 1;
3515 } else {
3516 real_offset = next_nonstatic_short_offset;
3517 next_nonstatic_short_offset += BytesPerShort;
3518 }
3519 break;
3520 case NONSTATIC_WORD:
3521 if( nonstatic_word_space_count > 0 ) {
3522 real_offset = nonstatic_word_space_offset;
3523 nonstatic_word_space_offset += BytesPerInt;
3524 nonstatic_word_space_count -= 1;
3525 } else {
3526 real_offset = next_nonstatic_word_offset;
3527 next_nonstatic_word_offset += BytesPerInt;
3528 }
3529 break;
3530 case NONSTATIC_DOUBLE:
3531 real_offset = next_nonstatic_double_offset;
3532 next_nonstatic_double_offset += BytesPerLong;
3533 break;
3534 default:
3535 ShouldNotReachHere();
3536 }
3537 fs.set_offset(real_offset);
3538 }
3539
3540
3541 // Handle the contended cases.
3542 //
3543 // Each contended field should not intersect the cache line with another contended field.
3544 // In the absence of alignment information, we end up with pessimistically separating
3545 // the fields with full-width padding.
3546 //
3547 // Additionally, this should not break alignment for the fields, so we round the alignment up
3548 // for each field.
3549 if (nonstatic_contended_count > 0) {
3550
3551 // if there is at least one contended field, we need to have pre-padding for them
3552 next_nonstatic_padded_offset += ContendedPaddingWidth;
3553
3554 // collect all contended groups
3555 BitMap bm(_cp->size());
3556 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3557 // skip already laid out fields
3558 if (fs.is_offset_set()) continue;
3559
3560 if (fs.is_contended()) {
3561 bm.set_bit(fs.contended_group());
3562 }
3563 }
3564
3565 int current_group = -1;
3566 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3567
3568 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3569
3570 // skip already laid out fields
3571 if (fs.is_offset_set()) continue;
3572
3573 // skip non-contended fields and fields from different group
3574 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3575
3576 // handle statics below
3577 if (fs.access_flags().is_static()) continue;
3578
3579 int real_offset;
3580 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3581
3582 switch (atype) {
3583 case NONSTATIC_BYTE:
3584 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3585 real_offset = next_nonstatic_padded_offset;
3586 next_nonstatic_padded_offset += 1;
3587 break;
3588
3589 case NONSTATIC_SHORT:
3590 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3591 real_offset = next_nonstatic_padded_offset;
3592 next_nonstatic_padded_offset += BytesPerShort;
3593 break;
3594
3595 case NONSTATIC_WORD:
3596 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3597 real_offset = next_nonstatic_padded_offset;
3598 next_nonstatic_padded_offset += BytesPerInt;
3599 break;
3600
3601 case NONSTATIC_DOUBLE:
3602 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3603 real_offset = next_nonstatic_padded_offset;
3604 next_nonstatic_padded_offset += BytesPerLong;
3605 break;
3606
3607 case NONSTATIC_OOP:
3608 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3609 real_offset = next_nonstatic_padded_offset;
3610 next_nonstatic_padded_offset += heapOopSize;
3611
3612 // Record this oop in the oop maps
3613 if( nonstatic_oop_map_count > 0 &&
3614 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3615 real_offset -
3616 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3617 heapOopSize ) {
3618 // This oop is adjacent to the previous one, add to current oop map
3619 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3620 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3621 } else {
3622 // This oop is not adjacent to the previous one, create new oop map
3623 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3624 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3625 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3626 nonstatic_oop_map_count += 1;
3627 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3628 first_nonstatic_oop_offset = real_offset;
3629 }
3630 }
3631 break;
3632
3633 default:
3634 ShouldNotReachHere();
3635 }
3636
3637 if (fs.contended_group() == 0) {
3638 // Contended group defines the equivalence class over the fields:
3639 // the fields within the same contended group are not inter-padded.
3640 // The only exception is default group, which does not incur the
3641 // equivalence, and so requires intra-padding.
3642 next_nonstatic_padded_offset += ContendedPaddingWidth;
3643 }
3644
3645 fs.set_offset(real_offset);
3646 } // for
3647
3648 // Start laying out the next group.
3649 // Note that this will effectively pad the last group in the back;
3650 // this is expected to alleviate memory contention effects for
3651 // subclass fields and/or adjacent object.
3652 // If this was the default group, the padding is already in place.
3653 if (current_group != 0) {
3654 next_nonstatic_padded_offset += ContendedPaddingWidth;
3655 }
3656 }
3657
3658 // handle static fields
3659 }
3660
3661 // Entire class is contended, pad in the back.
3662 // This helps to alleviate memory contention effects for subclass fields
3663 // and/or adjacent object.
3664 if (is_contended_class) {
3665 next_nonstatic_padded_offset += ContendedPaddingWidth;
3666 }
3667
3668 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3669
3670 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3671 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3672 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3673
3674 int static_field_size = (static_fields_end -
3675 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3676 nonstatic_field_size = nonstatic_field_size +
3677 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3678
3679 int instance_size = align_object_size(instance_end / wordSize);
3680
3681 assert(instance_size == align_object_size(align_size_up(
3682 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3683 wordSize) / wordSize), "consistent layout helper value");
3684
3685 // Invariant: nonstatic_field end/start should only change if there are
3686 // nonstatic fields in the class, or if the class is contended. We compare
3687 // against the non-aligned value, so that end alignment will not fail the
3688 // assert without actually having the fields.
3689 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3690 is_contended_class ||
3691 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3692
3693 // Number of non-static oop map blocks allocated at end of klass.
3694 const unsigned int total_oop_map_count =
3695 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3696 first_nonstatic_oop_offset);
3697
3698 #ifndef PRODUCT
3699 if (PrintFieldLayout) {
3700 print_field_layout(_class_name,
3701 _fields,
3702 _cp,
3703 instance_size,
3704 nonstatic_fields_start,
3705 nonstatic_fields_end,
3706 static_fields_end);
3707 }
3708
3709 #endif
3710 // Pass back information needed for InstanceKlass creation
3711 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3712 info->nonstatic_oop_counts = nonstatic_oop_counts;
3713 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3714 info->total_oop_map_count = total_oop_map_count;
3715 info->instance_size = instance_size;
3716 info->static_field_size = static_field_size;
3717 info->nonstatic_field_size = nonstatic_field_size;
3718 info->has_nonstatic_fields = has_nonstatic_fields;
3719 }
3720
3721
3722 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3723 ClassLoaderData* loader_data,
3724 Handle protection_domain,
3725 KlassHandle host_klass,
3726 GrowableArray<Handle>* cp_patches,
3727 TempNewSymbol& parsed_name,
3728 bool verify,
3729 TRAPS) {
3730
3731 // When a retransformable agent is attached, JVMTI caches the
3732 // class bytes that existed before the first retransformation.
3733 // If RedefineClasses() was used before the retransformable
3734 // agent attached, then the cached class bytes may not be the
3735 // original class bytes.
3736 JvmtiCachedClassFileData *cached_class_file = NULL;
3737 Handle class_loader(THREAD, loader_data->class_loader());
3738 bool has_default_methods = false;
3739 bool declares_default_methods = false;
3740 ResourceMark rm(THREAD);
3741
3742 ClassFileStream* cfs = stream();
3743 // Timing
3744 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3745 JavaThread* jt = (JavaThread*) THREAD;
3746
3747 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3748 ClassLoader::perf_class_parse_selftime(),
3749 NULL,
3750 jt->get_thread_stat()->perf_recursion_counts_addr(),
3751 jt->get_thread_stat()->perf_timers_addr(),
3752 PerfClassTraceTime::PARSE_CLASS);
3753
3754 init_parsed_class_attributes(loader_data);
3755
3756 if (JvmtiExport::should_post_class_file_load_hook()) {
3757 // Get the cached class file bytes (if any) from the class that
3758 // is being redefined or retransformed. We use jvmti_thread_state()
3759 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3760 // a JvmtiThreadState any earlier than necessary. This will help
3761 // avoid the bug described by 7126851.
3762 JvmtiThreadState *state = jt->jvmti_thread_state();
3763 if (state != NULL) {
3764 KlassHandle *h_class_being_redefined =
3765 state->get_class_being_redefined();
3766 if (h_class_being_redefined != NULL) {
3767 instanceKlassHandle ikh_class_being_redefined =
3768 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3769 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3770 }
3771 }
3772
3773 unsigned char* ptr = cfs->buffer();
3774 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3775
3776 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3777 &ptr, &end_ptr, &cached_class_file);
3778
3779 if (ptr != cfs->buffer()) {
3780 // JVMTI agent has modified class file data.
3781 // Set new class file stream using JVMTI agent modified
3782 // class file data.
3783 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3784 set_stream(cfs);
3785 }
3786 }
3787
3788 _host_klass = host_klass;
3789 _cp_patches = cp_patches;
3790
3791 instanceKlassHandle nullHandle;
3792
3793 // Figure out whether we can skip format checking (matching classic VM behavior)
3794 if (DumpSharedSpaces) {
3795 // verify == true means it's a 'remote' class (i.e., non-boot class)
3796 // Verification decision is based on BytecodeVerificationRemote flag
3797 // for those classes.
3798 _need_verify = (verify) ? BytecodeVerificationRemote :
3799 BytecodeVerificationLocal;
3800 } else {
3801 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3802 }
3803
3804 // Set the verify flag in stream
3805 cfs->set_verify(_need_verify);
3806
3807 // Save the class file name for easier error message printing.
3808 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3809
3810 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3811 // Magic value
3812 u4 magic = cfs->get_u4_fast();
3813 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3814 "Incompatible magic value %u in class file %s",
3815 magic, CHECK_(nullHandle));
3816
3817 // Version numbers
3818 u2 minor_version = cfs->get_u2_fast();
3819 u2 major_version = cfs->get_u2_fast();
3820
3821 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3822 ResourceMark rm;
3823 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3824 major_version, minor_version, name->as_C_string());
3825 Exceptions::fthrow(
3826 THREAD_AND_LOCATION,
3827 vmSymbols::java_lang_UnsupportedClassVersionError(),
3828 "Unsupported major.minor version for dump time %u.%u",
3829 major_version,
3830 minor_version);
3831 }
3832
3833 // Check version numbers - we check this even with verifier off
3834 if (!is_supported_version(major_version, minor_version)) {
3835 if (name == NULL) {
3836 Exceptions::fthrow(
3837 THREAD_AND_LOCATION,
3838 vmSymbols::java_lang_UnsupportedClassVersionError(),
3839 "Unsupported class file version %u.%u, "
3840 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3841 major_version,
3842 minor_version,
3843 JAVA_MAX_SUPPORTED_VERSION,
3844 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3845 } else {
3846 ResourceMark rm(THREAD);
3847 Exceptions::fthrow(
3848 THREAD_AND_LOCATION,
3849 vmSymbols::java_lang_UnsupportedClassVersionError(),
3850 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3851 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3852 name->as_C_string(),
3853 major_version,
3854 minor_version,
3855 JAVA_MAX_SUPPORTED_VERSION,
3856 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3857 }
3858 return nullHandle;
3859 }
3860
3861 _major_version = major_version;
3862 _minor_version = minor_version;
3863
3864
3865 // Check if verification needs to be relaxed for this class file
3866 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3867 _relax_verify = Verifier::relax_verify_for(class_loader());
3868
3869 // Constant pool
3870 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3871
3872 int cp_size = cp->length();
3873
3874 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3875
3876 // Access flags
3877 AccessFlags access_flags;
3878 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3879
3880 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3881 // Set abstract bit for old class files for backward compatibility
3882 flags |= JVM_ACC_ABSTRACT;
3883 }
3884 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3885 access_flags.set_flags(flags);
3886
3887 // This class and superclass
3888 u2 this_class_index = cfs->get_u2_fast();
3889 check_property(
3890 valid_cp_range(this_class_index, cp_size) &&
3891 cp->tag_at(this_class_index).is_unresolved_klass(),
3892 "Invalid this class index %u in constant pool in class file %s",
3893 this_class_index, CHECK_(nullHandle));
3894
3895 Symbol* class_name = cp->klass_name_at(this_class_index);
3896 assert(class_name != NULL, "class_name can't be null");
3897
3898 // It's important to set parsed_name *before* resolving the super class.
3899 // (it's used for cleanup by the caller if parsing fails)
3900 parsed_name = class_name;
3901 // parsed_name is returned and can be used if there's an error, so add to
3902 // its reference count. Caller will decrement the refcount.
3903 parsed_name->increment_refcount();
3904
3905 // Update _class_name which could be null previously to be class_name
3906 _class_name = class_name;
3907
3908 // Don't need to check whether this class name is legal or not.
3909 // It has been checked when constant pool is parsed.
3910 // However, make sure it is not an array type.
3911 if (_need_verify) {
3912 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3913 "Bad class name in class file %s",
3914 CHECK_(nullHandle));
3915 }
3916
3917 Klass* preserve_this_klass; // for storing result across HandleMark
3918
3919 // release all handles when parsing is done
3920 { HandleMark hm(THREAD);
3921
3922 // Checks if name in class file matches requested name
3923 if (name != NULL && class_name != name) {
3924 ResourceMark rm(THREAD);
3925 Exceptions::fthrow(
3926 THREAD_AND_LOCATION,
3927 vmSymbols::java_lang_NoClassDefFoundError(),
3928 "%s (wrong name: %s)",
3929 name->as_C_string(),
3930 class_name->as_C_string()
3931 );
3932 return nullHandle;
3933 }
3934
3935 if (TraceClassLoadingPreorder) {
3936 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3937 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3938 tty->print_cr("]");
3939 }
3940 #if INCLUDE_CDS
3941 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3942 // Only dump the classes that can be stored into CDS archive
3943 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3944 if (name != NULL) {
3945 ResourceMark rm(THREAD);
3946 classlist_file->print_cr("%s", name->as_C_string());
3947 classlist_file->flush();
3948 }
3949 }
3950 }
3951 #endif
3952
3953 u2 super_class_index = cfs->get_u2_fast();
3954 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3955 CHECK_NULL);
3956
3957 // Interfaces
3958 u2 itfs_len = cfs->get_u2_fast();
3959 Array<Klass*>* local_interfaces =
3960 parse_interfaces(itfs_len, protection_domain, _class_name,
3961 &has_default_methods, CHECK_(nullHandle));
3962
3963 u2 java_fields_count = 0;
3964 // Fields (offsets are filled in later)
3965 FieldAllocationCount fac;
3966 Array<u2>* fields = parse_fields(class_name,
3967 access_flags.is_interface(),
3968 &fac, &java_fields_count,
3969 CHECK_(nullHandle));
3970 // Methods
3971 bool has_final_method = false;
3972 AccessFlags promoted_flags;
3973 promoted_flags.set_flags(0);
3974 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3975 &promoted_flags,
3976 &has_final_method,
3977 &declares_default_methods,
3978 CHECK_(nullHandle));
3979
3980 if (declares_default_methods) {
3981 has_default_methods = true;
3982 }
3983
3984 // Additional attributes
3985 ClassAnnotationCollector parsed_annotations;
3986 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3987
3988 // Finalize the Annotations metadata object,
3989 // now that all annotation arrays have been created.
3990 create_combined_annotations(CHECK_(nullHandle));
3991
3992 // Make sure this is the end of class file stream
3993 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3994
3995 // We check super class after class file is parsed and format is checked
3996 if (super_class_index > 0 && super_klass.is_null()) {
3997 Symbol* sk = cp->klass_name_at(super_class_index);
3998 if (access_flags.is_interface()) {
3999 // Before attempting to resolve the superclass, check for class format
4000 // errors not checked yet.
4001 guarantee_property(sk == vmSymbols::java_lang_Object(),
4002 "Interfaces must have java.lang.Object as superclass in class file %s",
4003 CHECK_(nullHandle));
4004 }
4005 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4006 class_loader,
4007 protection_domain,
4008 true,
4009 CHECK_(nullHandle));
4010
4011 KlassHandle kh (THREAD, k);
4012 super_klass = instanceKlassHandle(THREAD, kh());
4013 }
4014 if (super_klass.not_null()) {
4015
4016 if (super_klass->has_default_methods()) {
4017 has_default_methods = true;
4018 }
4019
4020 if (super_klass->is_interface()) {
4021 ResourceMark rm(THREAD);
4022 Exceptions::fthrow(
4023 THREAD_AND_LOCATION,
4024 vmSymbols::java_lang_IncompatibleClassChangeError(),
4025 "class %s has interface %s as super class",
4026 class_name->as_klass_external_name(),
4027 super_klass->external_name()
4028 );
4029 return nullHandle;
4030 }
4031 // Make sure super class is not final
4032 if (super_klass->is_final()) {
4033 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4034 }
4035 }
4036
4037 // save super klass for error handling.
4038 _super_klass = super_klass;
4039
4040 // Compute the transitive list of all unique interfaces implemented by this class
4041 _transitive_interfaces =
4042 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4043
4044 // sort methods
4045 intArray* method_ordering = sort_methods(methods);
4046
4047 // promote flags from parse_methods() to the klass' flags
4048 access_flags.add_promoted_flags(promoted_flags.as_int());
4049
4050 // Size of Java vtable (in words)
4051 int vtable_size = 0;
4052 int itable_size = 0;
4053 int num_miranda_methods = 0;
4054
4055 GrowableArray<Method*> all_mirandas(20);
4056
4057 klassVtable::compute_vtable_size_and_num_mirandas(
4058 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4059 access_flags, class_loader, class_name, local_interfaces,
4060 CHECK_(nullHandle));
4061
4062 // Size of Java itable (in words)
4063 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4064
4065 FieldLayoutInfo info;
4066 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4067
4068 int total_oop_map_size2 =
4069 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4070
4071 // Compute reference type
4072 ReferenceType rt;
4073 if (super_klass() == NULL) {
4074 rt = REF_NONE;
4075 } else {
4076 rt = super_klass->reference_type();
4077 }
4078
4079 // We can now create the basic Klass* for this klass
4080 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4081 vtable_size,
4082 itable_size,
4083 info.static_field_size,
4084 total_oop_map_size2,
4085 rt,
4086 access_flags,
4087 name,
4088 super_klass(),
4089 !host_klass.is_null(),
4090 CHECK_(nullHandle));
4091 instanceKlassHandle this_klass (THREAD, _klass);
4092
4093 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4094 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4095 "sanity");
4096
4097 // Fill in information already parsed
4098 this_klass->set_should_verify_class(verify);
4099 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4100 this_klass->set_layout_helper(lh);
4101 assert(this_klass->oop_is_instance(), "layout is correct");
4102 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4103 // Not yet: supers are done below to support the new subtype-checking fields
4104 //this_klass->set_super(super_klass());
4105 this_klass->set_class_loader_data(loader_data);
4106 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4107 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4108 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4109
4110 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4111
4112 if (has_final_method) {
4113 this_klass->set_has_final_method();
4114 }
4115 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4116 // The InstanceKlass::_methods_jmethod_ids cache
4117 // is managed on the assumption that the initial cache
4118 // size is equal to the number of methods in the class. If
4119 // that changes, then InstanceKlass::idnum_can_increment()
4120 // has to be changed accordingly.
4121 this_klass->set_initial_method_idnum(methods->length());
4122 this_klass->set_name(cp->klass_name_at(this_class_index));
4123 if (is_anonymous()) // I am well known to myself
4124 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4125
4126 this_klass->set_minor_version(minor_version);
4127 this_klass->set_major_version(major_version);
4128 this_klass->set_has_default_methods(has_default_methods);
4129 this_klass->set_declares_default_methods(declares_default_methods);
4130
4131 if (!host_klass.is_null()) {
4132 assert (this_klass->is_anonymous(), "should be the same");
4133 this_klass->set_host_klass(host_klass());
4134 }
4135
4136 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4137 // (We used to do this lazily, but now we query it in Rewriter,
4138 // which is eagerly done for every method, so we might as well do it now,
4139 // when everything is fresh in memory.)
4140 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4141 for (int j = 0; j < methods->length(); j++) {
4142 methods->at(j)->init_intrinsic_id();
4143 }
4144 }
4145
4146 if (cached_class_file != NULL) {
4147 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4148 this_klass->set_cached_class_file(cached_class_file);
4149 }
4150
4151 // Fill in field values obtained by parse_classfile_attributes
4152 if (parsed_annotations.has_any_annotations())
4153 parsed_annotations.apply_to(this_klass);
4154 apply_parsed_class_attributes(this_klass);
4155
4156 // Miranda methods
4157 if ((num_miranda_methods > 0) ||
4158 // if this class introduced new miranda methods or
4159 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4160 // super class exists and this class inherited miranda methods
4161 ) {
4162 this_klass->set_has_miranda_methods(); // then set a flag
4163 }
4164
4165 // Fill in information needed to compute superclasses.
4166 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4167
4168 // Initialize itable offset tables
4169 klassItable::setup_itable_offset_table(this_klass);
4170
4171 // Compute transitive closure of interfaces this class implements
4172 // Do final class setup
4173 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4174
4175 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4176 set_precomputed_flags(this_klass);
4177
4178 // reinitialize modifiers, using the InnerClasses attribute
4179 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4180 this_klass->set_modifier_flags(computed_modifiers);
4181
4182 // check if this class can access its super class
4183 check_super_class_access(this_klass, CHECK_(nullHandle));
4184
4185 // check if this class can access its superinterfaces
4186 check_super_interface_access(this_klass, CHECK_(nullHandle));
4187
4188 // check if this class overrides any final method
4189 check_final_method_override(this_klass, CHECK_(nullHandle));
4190
4191 // check that if this class is an interface then it doesn't have static methods
4192 if (this_klass->is_interface()) {
4193 /* An interface in a JAVA 8 classfile can be static */
4194 if (_major_version < JAVA_8_VERSION) {
4195 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4196 }
4197 }
4198
4199 // Allocate mirror and initialize static fields
4200 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4201 CHECK_(nullHandle));
4202
4203 // Generate any default methods - default methods are interface methods
4204 // that have a default implementation. This is new with Lambda project.
4205 if (has_default_methods ) {
4206 DefaultMethods::generate_default_methods(
4207 this_klass(), &all_mirandas, CHECK_(nullHandle));
4208 }
4209
4210 // Update the loader_data graph.
4211 record_defined_class_dependencies(this_klass, CHECK_NULL);
4212
4213 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4214 false /* not shared class */);
4215
4216 if (TraceClassLoading) {
4217 ResourceMark rm;
4218 // print in a single call to reduce interleaving of output
4219 if (cfs->source() != NULL) {
4220 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4221 cfs->source());
4222 } else if (class_loader.is_null()) {
4223 Klass* caller =
4224 THREAD->is_Java_thread()
4225 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4226 : NULL;
4227 // caller can be NULL, for example, during a JVMTI VM_Init hook
4228 if (caller != NULL) {
4229 tty->print("[Loaded %s by instance of %s]\n",
4230 this_klass->external_name(),
4231 InstanceKlass::cast(caller)->external_name());
4232 } else {
4233 tty->print("[Loaded %s]\n", this_klass->external_name());
4234 }
4235 } else {
4236 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4237 InstanceKlass::cast(class_loader->klass())->external_name());
4238 }
4239 }
4240
4241 if (TraceClassResolution) {
4242 ResourceMark rm;
4243 // print out the superclass.
4244 const char * from = this_klass()->external_name();
4245 if (this_klass->java_super() != NULL) {
4246 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4247 }
4248 // print out each of the interface classes referred to by this class.
4249 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4250 if (local_interfaces != NULL) {
4251 int length = local_interfaces->length();
4252 for (int i = 0; i < length; i++) {
4253 Klass* k = local_interfaces->at(i);
4254 InstanceKlass* to_class = InstanceKlass::cast(k);
4255 const char * to = to_class->external_name();
4256 tty->print("RESOLVE %s %s (interface)\n", from, to);
4257 }
4258 }
4259 }
4260
4261 // preserve result across HandleMark
4262 preserve_this_klass = this_klass();
4263 }
4264
4265 // Create new handle outside HandleMark (might be needed for
4266 // Extended Class Redefinition)
4267 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4268 debug_only(this_klass->verify();)
4269
4270 // Clear class if no error has occurred so destructor doesn't deallocate it
4271 _klass = NULL;
4272 return this_klass;
4273 }
4274
4275 // Destructor to clean up if there's an error
4276 ClassFileParser::~ClassFileParser() {
4277 MetadataFactory::free_metadata(_loader_data, _cp);
4278 MetadataFactory::free_array<u2>(_loader_data, _fields);
4279
4280 // Free methods
4281 InstanceKlass::deallocate_methods(_loader_data, _methods);
4282
4283 // beware of the Universe::empty_blah_array!!
4284 if (_inner_classes != Universe::the_empty_short_array()) {
4285 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4286 }
4287
4288 // Free interfaces
4289 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4290 _local_interfaces, _transitive_interfaces);
4291
4292 if (_combined_annotations != NULL) {
4293 // After all annotations arrays have been created, they are installed into the
4294 // Annotations object that will be assigned to the InstanceKlass being created.
4295
4296 // Deallocate the Annotations object and the installed annotations arrays.
4297 _combined_annotations->deallocate_contents(_loader_data);
4298
4299 // If the _combined_annotations pointer is non-NULL,
4300 // then the other annotations fields should have been cleared.
4301 assert(_annotations == NULL, "Should have been cleared");
4302 assert(_type_annotations == NULL, "Should have been cleared");
4303 assert(_fields_annotations == NULL, "Should have been cleared");
4304 assert(_fields_type_annotations == NULL, "Should have been cleared");
4305 } else {
4306 // If the annotations arrays were not installed into the Annotations object,
4307 // then they have to be deallocated explicitly.
4308 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4309 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4310 Annotations::free_contents(_loader_data, _fields_annotations);
4311 Annotations::free_contents(_loader_data, _fields_type_annotations);
4312 }
4313
4314 clear_class_metadata();
4315
4316 // deallocate the klass if already created. Don't directly deallocate, but add
4317 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4318 // at a safepoint.
4319 if (_klass != NULL) {
4320 _loader_data->add_to_deallocate_list(_klass);
4321 }
4322 _klass = NULL;
4323 }
4324
4325 void ClassFileParser::print_field_layout(Symbol* name,
4326 Array<u2>* fields,
4327 constantPoolHandle cp,
4328 int instance_size,
4329 int instance_fields_start,
4330 int instance_fields_end,
4331 int static_fields_end) {
4332 tty->print("%s: field layout\n", name->as_klass_external_name());
4333 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4334 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4335 if (!fs.access_flags().is_static()) {
4336 tty->print(" @%3d \"%s\" %s\n",
4337 fs.offset(),
4338 fs.name()->as_klass_external_name(),
4339 fs.signature()->as_klass_external_name());
4340 }
4341 }
4342 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4343 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4344 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4345 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4346 if (fs.access_flags().is_static()) {
4347 tty->print(" @%3d \"%s\" %s\n",
4348 fs.offset(),
4349 fs.name()->as_klass_external_name(),
4350 fs.signature()->as_klass_external_name());
4351 }
4352 }
4353 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4354 tty->print("\n");
4355 }
4356
4357 unsigned int
4358 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4359 unsigned int nonstatic_oop_map_count,
4360 int first_nonstatic_oop_offset) {
4361 unsigned int map_count =
4362 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4363 if (nonstatic_oop_map_count > 0) {
4364 // We have oops to add to map
4365 if (map_count == 0) {
4366 map_count = nonstatic_oop_map_count;
4367 } else {
4368 // Check whether we should add a new map block or whether the last one can
4369 // be extended
4370 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4371 OopMapBlock* const last_map = first_map + map_count - 1;
4372
4373 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4374 if (next_offset == first_nonstatic_oop_offset) {
4375 // There is no gap bettwen superklass's last oop field and first
4376 // local oop field, merge maps.
4377 nonstatic_oop_map_count -= 1;
4378 } else {
4379 // Superklass didn't end with a oop field, add extra maps
4380 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4381 }
4382 map_count += nonstatic_oop_map_count;
4383 }
4384 }
4385 return map_count;
4386 }
4387
4388
4389 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4390 unsigned int nonstatic_oop_map_count,
4391 int* nonstatic_oop_offsets,
4392 unsigned int* nonstatic_oop_counts) {
4393 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4394 const InstanceKlass* const super = k->superklass();
4395 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4396 if (super_count > 0) {
4397 // Copy maps from superklass
4398 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4399 for (unsigned int i = 0; i < super_count; ++i) {
4400 *this_oop_map++ = *super_oop_map++;
4401 }
4402 }
4403
4404 if (nonstatic_oop_map_count > 0) {
4405 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4406 // The counts differ because there is no gap between superklass's last oop
4407 // field and the first local oop field. Extend the last oop map copied
4408 // from the superklass instead of creating new one.
4409 nonstatic_oop_map_count--;
4410 nonstatic_oop_offsets++;
4411 this_oop_map--;
4412 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4413 this_oop_map++;
4414 }
4415
4416 // Add new map blocks, fill them
4417 while (nonstatic_oop_map_count-- > 0) {
4418 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4419 this_oop_map->set_count(*nonstatic_oop_counts++);
4420 this_oop_map++;
4421 }
4422 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4423 this_oop_map, "sanity");
4424 }
4425 }
4426
4427
4428 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4429 Klass* super = k->super();
4430
4431 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4432 // in which case we don't have to register objects as finalizable
4433 if (!_has_empty_finalizer) {
4434 if (_has_finalizer ||
4435 (super != NULL && super->has_finalizer())) {
4436 k->set_has_finalizer();
4437 }
4438 }
4439
4440 #ifdef ASSERT
4441 bool f = false;
4442 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4443 vmSymbols::void_method_signature());
4444 if (m != NULL && !m->is_empty_method()) {
4445 f = true;
4446 }
4447
4448 // Spec doesn't prevent agent from redefinition of empty finalizer.
4449 // Despite the fact that it's generally bad idea and redefined finalizer
4450 // will not work as expected we shouldn't abort vm in this case
4451 if (!k->has_redefined_this_or_super()) {
4452 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4453 }
4454 #endif
4455
4456 // Check if this klass supports the java.lang.Cloneable interface
4457 if (SystemDictionary::Cloneable_klass_loaded()) {
4458 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4459 k->set_is_cloneable();
4460 }
4461 }
4462
4463 // Check if this klass has a vanilla default constructor
4464 if (super == NULL) {
4465 // java.lang.Object has empty default constructor
4466 k->set_has_vanilla_constructor();
4467 } else {
4468 if (super->has_vanilla_constructor() &&
4469 _has_vanilla_constructor) {
4470 k->set_has_vanilla_constructor();
4471 }
4472 #ifdef ASSERT
4473 bool v = false;
4474 if (super->has_vanilla_constructor()) {
4475 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4476 ), vmSymbols::void_method_signature());
4477 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4478 v = true;
4479 }
4480 }
4481 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4482 #endif
4483 }
4484
4485 // If it cannot be fast-path allocated, set a bit in the layout helper.
4486 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4487 assert(k->size_helper() > 0, "layout_helper is initialized");
4488 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4489 || k->is_abstract() || k->is_interface()
4490 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4491 || k->size_helper() >= FastAllocateSizeLimit) {
4492 // Forbid fast-path allocation.
4493 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4494 k->set_layout_helper(lh);
4495 }
4496 }
4497
4498 // Attach super classes and interface classes to class loader data
4499 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4500 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4501 if (defining_loader_data->is_the_null_class_loader_data()) {
4502 // Dependencies to null class loader data are implicit.
4503 return;
4504 } else {
4505 // add super class dependency
4506 Klass* super = defined_klass->super();
4507 if (super != NULL) {
4508 defining_loader_data->record_dependency(super, CHECK);
4509 }
4510
4511 // add super interface dependencies
4512 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4513 if (local_interfaces != NULL) {
4514 int length = local_interfaces->length();
4515 for (int i = 0; i < length; i++) {
4516 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4517 }
4518 }
4519 }
4520 }
4521
4522 // utility methods for appending an array with check for duplicates
4523
4524 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4525 // iterate over new interfaces
4526 for (int i = 0; i < ifs->length(); i++) {
4527 Klass* e = ifs->at(i);
4528 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4529 // add new interface
4530 result->append_if_missing(e);
4531 }
4532 }
4533
4534 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4535 instanceKlassHandle super,
4536 Array<Klass*>* local_ifs, TRAPS) {
4537 // Compute maximum size for transitive interfaces
4538 int max_transitive_size = 0;
4539 int super_size = 0;
4540 // Add superclass transitive interfaces size
4541 if (super.not_null()) {
4542 super_size = super->transitive_interfaces()->length();
4543 max_transitive_size += super_size;
4544 }
4545 // Add local interfaces' super interfaces
4546 int local_size = local_ifs->length();
4547 for (int i = 0; i < local_size; i++) {
4548 Klass* l = local_ifs->at(i);
4549 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4550 }
4551 // Finally add local interfaces
4552 max_transitive_size += local_size;
4553 // Construct array
4554 if (max_transitive_size == 0) {
4555 // no interfaces, use canonicalized array
4556 return Universe::the_empty_klass_array();
4557 } else if (max_transitive_size == super_size) {
4558 // no new local interfaces added, share superklass' transitive interface array
4559 return super->transitive_interfaces();
4560 } else if (max_transitive_size == local_size) {
4561 // only local interfaces added, share local interface array
4562 return local_ifs;
4563 } else {
4564 ResourceMark rm;
4565 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4566
4567 // Copy down from superclass
4568 if (super.not_null()) {
4569 append_interfaces(result, super->transitive_interfaces());
4570 }
4571
4572 // Copy down from local interfaces' superinterfaces
4573 for (int i = 0; i < local_ifs->length(); i++) {
4574 Klass* l = local_ifs->at(i);
4575 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4576 }
4577 // Finally add local interfaces
4578 append_interfaces(result, local_ifs);
4579
4580 // length will be less than the max_transitive_size if duplicates were removed
4581 int length = result->length();
4582 assert(length <= max_transitive_size, "just checking");
4583 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4584 for (int i = 0; i < length; i++) {
4585 Klass* e = result->at(i);
4586 assert(e != NULL, "just checking");
4587 new_result->at_put(i, e);
4588 }
4589 return new_result;
4590 }
4591 }
4592
4593 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4594 Klass* super = this_klass->super();
4595 if ((super != NULL) &&
4596 (!Reflection::verify_class_access(this_klass(), super, false))) {
4597 ResourceMark rm(THREAD);
4598 Exceptions::fthrow(
4599 THREAD_AND_LOCATION,
4600 vmSymbols::java_lang_IllegalAccessError(),
4601 "class %s cannot access its superclass %s",
4602 this_klass->external_name(),
4603 InstanceKlass::cast(super)->external_name()
4604 );
4605 return;
4606 }
4607 }
4608
4609
4610 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4611 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4612 int lng = local_interfaces->length();
4613 for (int i = lng - 1; i >= 0; i--) {
4614 Klass* k = local_interfaces->at(i);
4615 assert (k != NULL && k->is_interface(), "invalid interface");
4616 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4617 ResourceMark rm(THREAD);
4618 Exceptions::fthrow(
4619 THREAD_AND_LOCATION,
4620 vmSymbols::java_lang_IllegalAccessError(),
4621 "class %s cannot access its superinterface %s",
4622 this_klass->external_name(),
4623 InstanceKlass::cast(k)->external_name()
4624 );
4625 return;
4626 }
4627 }
4628 }
4629
4630
4631 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4632 Array<Method*>* methods = this_klass->methods();
4633 int num_methods = methods->length();
4634
4635 // go thru each method and check if it overrides a final method
4636 for (int index = 0; index < num_methods; index++) {
4637 Method* m = methods->at(index);
4638
4639 // skip private, static, and <init> methods
4640 if ((!m->is_private() && !m->is_static()) &&
4641 (m->name() != vmSymbols::object_initializer_name())) {
4642
4643 Symbol* name = m->name();
4644 Symbol* signature = m->signature();
4645 Klass* k = this_klass->super();
4646 Method* super_m = NULL;
4647 while (k != NULL) {
4648 // skip supers that don't have final methods.
4649 if (k->has_final_method()) {
4650 // lookup a matching method in the super class hierarchy
4651 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4652 if (super_m == NULL) {
4653 break; // didn't find any match; get out
4654 }
4655
4656 if (super_m->is_final() && !super_m->is_static() &&
4657 // matching method in super is final, and not static
4658 (Reflection::verify_field_access(this_klass(),
4659 super_m->method_holder(),
4660 super_m->method_holder(),
4661 super_m->access_flags(), false))
4662 // this class can access super final method and therefore override
4663 ) {
4664 ResourceMark rm(THREAD);
4665 Exceptions::fthrow(
4666 THREAD_AND_LOCATION,
4667 vmSymbols::java_lang_VerifyError(),
4668 "class %s overrides final method %s.%s%s",
4669 this_klass->external_name(),
4670 super_m->method_holder()->external_name(),
4671 name->as_C_string(),
4672 signature->as_C_string()
4673 );
4674 return;
4675 }
4676
4677 // continue to look from super_m's holder's super.
4678 k = super_m->method_holder()->super();
4679 continue;
4680 }
4681
4682 k = k->super();
4683 }
4684 }
4685 }
4686 }
4687
4688
4689 // assumes that this_klass is an interface
4690 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4691 assert(this_klass->is_interface(), "not an interface");
4692 Array<Method*>* methods = this_klass->methods();
4693 int num_methods = methods->length();
4694
4695 for (int index = 0; index < num_methods; index++) {
4696 Method* m = methods->at(index);
4697 // if m is static and not the init method, throw a verify error
4698 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4699 ResourceMark rm(THREAD);
4700 Exceptions::fthrow(
4701 THREAD_AND_LOCATION,
4702 vmSymbols::java_lang_VerifyError(),
4703 "Illegal static method %s in interface %s",
4704 m->name()->as_C_string(),
4705 this_klass->external_name()
4706 );
4707 return;
4708 }
4709 }
4710 }
4711
4712 // utility methods for format checking
4713
4714 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4715 if (!_need_verify) { return; }
4716
4717 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4718 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4719 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4720 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4721 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4722 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4723 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4724
4725 if ((is_abstract && is_final) ||
4726 (is_interface && !is_abstract) ||
4727 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4728 (!is_interface && major_gte_15 && is_annotation)) {
4729 ResourceMark rm(THREAD);
4730 Exceptions::fthrow(
4731 THREAD_AND_LOCATION,
4732 vmSymbols::java_lang_ClassFormatError(),
4733 "Illegal class modifiers in class %s: 0x%X",
4734 _class_name->as_C_string(), flags
4735 );
4736 return;
4737 }
4738 }
4739
4740 bool ClassFileParser::has_illegal_visibility(jint flags) {
4741 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4742 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4743 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4744
4745 return ((is_public && is_protected) ||
4746 (is_public && is_private) ||
4747 (is_protected && is_private));
4748 }
4749
4750 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4751 u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4752 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4753 (major <= max_version) &&
4754 ((major != max_version) ||
4755 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4756 }
4757
4758 void ClassFileParser::verify_legal_field_modifiers(
4759 jint flags, bool is_interface, TRAPS) {
4760 if (!_need_verify) { return; }
4761
4762 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4763 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4764 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4765 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4766 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4767 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4768 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4769 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4770 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4771
4772 bool is_illegal = false;
4773
4774 if (is_interface) {
4775 if (!is_public || !is_static || !is_final || is_private ||
4776 is_protected || is_volatile || is_transient ||
4777 (major_gte_15 && is_enum)) {
4778 is_illegal = true;
4779 }
4780 } else { // not interface
4781 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4782 is_illegal = true;
4783 }
4784 }
4785
4786 if (is_illegal) {
4787 ResourceMark rm(THREAD);
4788 Exceptions::fthrow(
4789 THREAD_AND_LOCATION,
4790 vmSymbols::java_lang_ClassFormatError(),
4791 "Illegal field modifiers in class %s: 0x%X",
4792 _class_name->as_C_string(), flags);
4793 return;
4794 }
4795 }
4796
4797 void ClassFileParser::verify_legal_method_modifiers(
4798 jint flags, bool is_interface, Symbol* name, TRAPS) {
4799 if (!_need_verify) { return; }
4800
4801 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4802 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4803 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4804 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4805 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4806 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4807 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4808 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4809 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4810 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4811 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4812 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4813 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4814
4815 bool is_illegal = false;
4816
4817 if (is_interface) {
4818 if (major_gte_8) {
4819 // Class file version is JAVA_8_VERSION or later Methods of
4820 // interfaces may set any of the flags except ACC_PROTECTED,
4821 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4822 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4823 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4824 (is_native || is_protected || is_final || is_synchronized) ||
4825 // If a specific method of a class or interface has its
4826 // ACC_ABSTRACT flag set, it must not have any of its
4827 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4828 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4829 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4830 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4831 (is_abstract && (is_private || is_static || is_strict))) {
4832 is_illegal = true;
4833 }
4834 } else if (major_gte_15) {
4835 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4836 if (!is_public || is_static || is_final || is_synchronized ||
4837 is_native || !is_abstract || is_strict) {
4838 is_illegal = true;
4839 }
4840 } else {
4841 // Class file version is pre-JAVA_1_5_VERSION
4842 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4843 is_illegal = true;
4844 }
4845 }
4846 } else { // not interface
4847 if (has_illegal_visibility(flags)) {
4848 is_illegal = true;
4849 } else {
4850 if (is_initializer) {
4851 if (is_static || is_final || is_synchronized || is_native ||
4852 is_abstract || (major_gte_15 && is_bridge)) {
4853 is_illegal = true;
4854 }
4855 } else { // not initializer
4856 if (is_abstract) {
4857 if ((is_final || is_native || is_private || is_static ||
4858 (major_gte_15 && (is_synchronized || is_strict)))) {
4859 is_illegal = true;
4860 }
4861 }
4862 }
4863 }
4864 }
4865
4866 if (is_illegal) {
4867 ResourceMark rm(THREAD);
4868 Exceptions::fthrow(
4869 THREAD_AND_LOCATION,
4870 vmSymbols::java_lang_ClassFormatError(),
4871 "Method %s in class %s has illegal modifiers: 0x%X",
4872 name->as_C_string(), _class_name->as_C_string(), flags);
4873 return;
4874 }
4875 }
4876
4877 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4878 assert(_need_verify, "only called when _need_verify is true");
4879 int i = 0;
4880 int count = length >> 2;
4881 for (int k=0; k<count; k++) {
4882 unsigned char b0 = buffer[i];
4883 unsigned char b1 = buffer[i+1];
4884 unsigned char b2 = buffer[i+2];
4885 unsigned char b3 = buffer[i+3];
4886 // For an unsigned char v,
4887 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4888 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4889 unsigned char res = b0 | b0 - 1 |
4890 b1 | b1 - 1 |
4891 b2 | b2 - 1 |
4892 b3 | b3 - 1;
4893 if (res >= 128) break;
4894 i += 4;
4895 }
4896 for(; i < length; i++) {
4897 unsigned short c;
4898 // no embedded zeros
4899 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4900 if(buffer[i] < 128) {
4901 continue;
4902 }
4903 if ((i + 5) < length) { // see if it's legal supplementary character
4904 if (UTF8::is_supplementary_character(&buffer[i])) {
4905 c = UTF8::get_supplementary_character(&buffer[i]);
4906 i += 5;
4907 continue;
4908 }
4909 }
4910 switch (buffer[i] >> 4) {
4911 default: break;
4912 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4913 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4914 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4915 c = (buffer[i] & 0x1F) << 6;
4916 i++;
4917 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4918 c += buffer[i] & 0x3F;
4919 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4920 // for classes with major > 47, c must a null or a character in its shortest form
4921 break;
4922 }
4923 }
4924 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4925 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4926 c = (buffer[i] & 0xF) << 12;
4927 i += 2;
4928 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4929 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4930 if (_major_version <= 47 || c >= 0x800) {
4931 // for classes with major > 47, c must be in its shortest form
4932 break;
4933 }
4934 }
4935 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4936 } // end of switch
4937 } // end of for
4938 }
4939
4940 // Checks if name is a legal class name.
4941 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4942 if (!_need_verify || _relax_verify) { return; }
4943
4944 char buf[fixed_buffer_size];
4945 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4946 unsigned int length = name->utf8_length();
4947 bool legal = false;
4948
4949 if (length > 0) {
4950 char* p;
4951 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4952 p = skip_over_field_signature(bytes, false, length, CHECK);
4953 legal = (p != NULL) && ((p - bytes) == (int)length);
4954 } else if (_major_version < JAVA_1_5_VERSION) {
4955 if (bytes[0] != '<') {
4956 p = skip_over_field_name(bytes, true, length);
4957 legal = (p != NULL) && ((p - bytes) == (int)length);
4958 }
4959 } else {
4960 // 4900761: relax the constraints based on JSR202 spec
4961 // Class names may be drawn from the entire Unicode character set.
4962 // Identifiers between '/' must be unqualified names.
4963 // The utf8 string has been verified when parsing cpool entries.
4964 legal = verify_unqualified_name(bytes, length, LegalClass);
4965 }
4966 }
4967 if (!legal) {
4968 ResourceMark rm(THREAD);
4969 Exceptions::fthrow(
4970 THREAD_AND_LOCATION,
4971 vmSymbols::java_lang_ClassFormatError(),
4972 "Illegal class name \"%s\" in class file %s", bytes,
4973 _class_name->as_C_string()
4974 );
4975 return;
4976 }
4977 }
4978
4979 // Checks if name is a legal field name.
4980 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4981 if (!_need_verify || _relax_verify) { return; }
4982
4983 char buf[fixed_buffer_size];
4984 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4985 unsigned int length = name->utf8_length();
4986 bool legal = false;
4987
4988 if (length > 0) {
4989 if (_major_version < JAVA_1_5_VERSION) {
4990 if (bytes[0] != '<') {
4991 char* p = skip_over_field_name(bytes, false, length);
4992 legal = (p != NULL) && ((p - bytes) == (int)length);
4993 }
4994 } else {
4995 // 4881221: relax the constraints based on JSR202 spec
4996 legal = verify_unqualified_name(bytes, length, LegalField);
4997 }
4998 }
4999
5000 if (!legal) {
5001 ResourceMark rm(THREAD);
5002 Exceptions::fthrow(
5003 THREAD_AND_LOCATION,
5004 vmSymbols::java_lang_ClassFormatError(),
5005 "Illegal field name \"%s\" in class %s", bytes,
5006 _class_name->as_C_string()
5007 );
5008 return;
5009 }
5010 }
5011
5012 // Checks if name is a legal method name.
5013 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5014 if (!_need_verify || _relax_verify) { return; }
5015
5016 assert(name != NULL, "method name is null");
5017 char buf[fixed_buffer_size];
5018 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5019 unsigned int length = name->utf8_length();
5020 bool legal = false;
5021
5022 if (length > 0) {
5023 if (bytes[0] == '<') {
5024 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5025 legal = true;
5026 }
5027 } else if (_major_version < JAVA_1_5_VERSION) {
5028 char* p;
5029 p = skip_over_field_name(bytes, false, length);
5030 legal = (p != NULL) && ((p - bytes) == (int)length);
5031 } else {
5032 // 4881221: relax the constraints based on JSR202 spec
5033 legal = verify_unqualified_name(bytes, length, LegalMethod);
5034 }
5035 }
5036
5037 if (!legal) {
5038 ResourceMark rm(THREAD);
5039 Exceptions::fthrow(
5040 THREAD_AND_LOCATION,
5041 vmSymbols::java_lang_ClassFormatError(),
5042 "Illegal method name \"%s\" in class %s", bytes,
5043 _class_name->as_C_string()
5044 );
5045 return;
5046 }
5047 }
5048
5049
5050 // Checks if signature is a legal field signature.
5051 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5052 if (!_need_verify) { return; }
5053
5054 char buf[fixed_buffer_size];
5055 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5056 unsigned int length = signature->utf8_length();
5057 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5058
5059 if (p == NULL || (p - bytes) != (int)length) {
5060 throwIllegalSignature("Field", name, signature, CHECK);
5061 }
5062 }
5063
5064 // Checks if signature is a legal method signature.
5065 // Returns number of parameters
5066 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5067 if (!_need_verify) {
5068 // make sure caller's args_size will be less than 0 even for non-static
5069 // method so it will be recomputed in compute_size_of_parameters().
5070 return -2;
5071 }
5072
5073 unsigned int args_size = 0;
5074 char buf[fixed_buffer_size];
5075 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5076 unsigned int length = signature->utf8_length();
5077 char* nextp;
5078
5079 // The first character must be a '('
5080 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5081 length--;
5082 // Skip over legal field signatures
5083 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5084 while ((length > 0) && (nextp != NULL)) {
5085 args_size++;
5086 if (p[0] == 'J' || p[0] == 'D') {
5087 args_size++;
5088 }
5089 length -= nextp - p;
5090 p = nextp;
5091 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5092 }
5093 // The first non-signature thing better be a ')'
5094 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5095 length--;
5096 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5097 // All internal methods must return void
5098 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5099 return args_size;
5100 }
5101 } else {
5102 // Now we better just have a return value
5103 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5104 if (nextp && ((int)length == (nextp - p))) {
5105 return args_size;
5106 }
5107 }
5108 }
5109 }
5110 // Report error
5111 throwIllegalSignature("Method", name, signature, CHECK_0);
5112 return 0;
5113 }
5114
5115
5116 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5117 // Method names also may not contain the characters '<' or '>', unless <init>
5118 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5119 // method. Because these names have been checked as special cases before
5120 // calling this method in verify_legal_method_name.
5121 bool ClassFileParser::verify_unqualified_name(
5122 char* name, unsigned int length, int type) {
5123 jchar ch;
5124
5125 for (char* p = name; p != name + length; ) {
5126 ch = *p;
5127 if (ch < 128) {
5128 p++;
5129 if (ch == '.' || ch == ';' || ch == '[' ) {
5130 return false; // do not permit '.', ';', or '['
5131 }
5132 if (type != LegalClass && ch == '/') {
5133 return false; // do not permit '/' unless it's class name
5134 }
5135 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5136 return false; // do not permit '<' or '>' in method names
5137 }
5138 } else {
5139 char* tmp_p = UTF8::next(p, &ch);
5140 p = tmp_p;
5141 }
5142 }
5143 return true;
5144 }
5145
5146
5147 // Take pointer to a string. Skip over the longest part of the string that could
5148 // be taken as a fieldname. Allow '/' if slash_ok is true.
5149 // Return a pointer to just past the fieldname.
5150 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5151 // being true, we saw consecutive slashes (meaning we were looking for a
5152 // qualified path but found something that was badly-formed).
5153 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5154 char* p;
5155 jchar ch;
5156 jboolean last_is_slash = false;
5157 jboolean not_first_ch = false;
5158
5159 for (p = name; p != name + length; not_first_ch = true) {
5160 char* old_p = p;
5161 ch = *p;
5162 if (ch < 128) {
5163 p++;
5164 // quick check for ascii
5165 if ((ch >= 'a' && ch <= 'z') ||
5166 (ch >= 'A' && ch <= 'Z') ||
5167 (ch == '_' || ch == '$') ||
5168 (not_first_ch && ch >= '0' && ch <= '9')) {
5169 last_is_slash = false;
5170 continue;
5171 }
5172 if (slash_ok && ch == '/') {
5173 if (last_is_slash) {
5174 return NULL; // Don't permit consecutive slashes
5175 }
5176 last_is_slash = true;
5177 continue;
5178 }
5179 } else {
5180 jint unicode_ch;
5181 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5182 p = tmp_p;
5183 last_is_slash = false;
5184 // Check if ch is Java identifier start or is Java identifier part
5185 // 4672820: call java.lang.Character methods directly without generating separate tables.
5186 EXCEPTION_MARK;
5187 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5188
5189 // return value
5190 JavaValue result(T_BOOLEAN);
5191 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5192 JavaCallArguments args;
5193 args.push_int(unicode_ch);
5194
5195 // public static boolean isJavaIdentifierStart(char ch);
5196 JavaCalls::call_static(&result,
5197 klass,
5198 vmSymbols::isJavaIdentifierStart_name(),
5199 vmSymbols::int_bool_signature(),
5200 &args,
5201 THREAD);
5202
5203 if (HAS_PENDING_EXCEPTION) {
5204 CLEAR_PENDING_EXCEPTION;
5205 return 0;
5206 }
5207 if (result.get_jboolean()) {
5208 continue;
5209 }
5210
5211 if (not_first_ch) {
5212 // public static boolean isJavaIdentifierPart(char ch);
5213 JavaCalls::call_static(&result,
5214 klass,
5215 vmSymbols::isJavaIdentifierPart_name(),
5216 vmSymbols::int_bool_signature(),
5217 &args,
5218 THREAD);
5219
5220 if (HAS_PENDING_EXCEPTION) {
5221 CLEAR_PENDING_EXCEPTION;
5222 return 0;
5223 }
5224
5225 if (result.get_jboolean()) {
5226 continue;
5227 }
5228 }
5229 }
5230 return (not_first_ch) ? old_p : NULL;
5231 }
5232 return (not_first_ch) ? p : NULL;
5233 }
5234
5235
5236 // Take pointer to a string. Skip over the longest part of the string that could
5237 // be taken as a field signature. Allow "void" if void_ok.
5238 // Return a pointer to just past the signature.
5239 // Return NULL if no legal signature is found.
5240 char* ClassFileParser::skip_over_field_signature(char* signature,
5241 bool void_ok,
5242 unsigned int length,
5243 TRAPS) {
5244 unsigned int array_dim = 0;
5245 while (length > 0) {
5246 switch (signature[0]) {
5247 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5248 case JVM_SIGNATURE_BOOLEAN:
5249 case JVM_SIGNATURE_BYTE:
5250 case JVM_SIGNATURE_CHAR:
5251 case JVM_SIGNATURE_SHORT:
5252 case JVM_SIGNATURE_INT:
5253 case JVM_SIGNATURE_FLOAT:
5254 case JVM_SIGNATURE_LONG:
5255 case JVM_SIGNATURE_DOUBLE:
5256 return signature + 1;
5257 case JVM_SIGNATURE_CLASS: {
5258 if (_major_version < JAVA_1_5_VERSION) {
5259 // Skip over the class name if one is there
5260 char* p = skip_over_field_name(signature + 1, true, --length);
5261
5262 // The next character better be a semicolon
5263 if (p && (p - signature) > 1 && p[0] == ';') {
5264 return p + 1;
5265 }
5266 } else {
5267 // 4900761: For class version > 48, any unicode is allowed in class name.
5268 length--;
5269 signature++;
5270 while (length > 0 && signature[0] != ';') {
5271 if (signature[0] == '.') {
5272 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5273 }
5274 length--;
5275 signature++;
5276 }
5277 if (signature[0] == ';') { return signature + 1; }
5278 }
5279
5280 return NULL;
5281 }
5282 case JVM_SIGNATURE_ARRAY:
5283 array_dim++;
5284 if (array_dim > 255) {
5285 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5286 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5287 }
5288 // The rest of what's there better be a legal signature
5289 signature++;
5290 length--;
5291 void_ok = false;
5292 break;
5293
5294 default:
5295 return NULL;
5296 }
5297 }
5298 return NULL;
5299 }