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(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(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("bad constant pool tag value %u", cp->tag_at(index).value());
496 ShouldNotReachHere();
497 break;
498 } // end of switch
499 } // end of for
500
501 if (_cp_patches != NULL) {
502 // need to treat this_class specially...
503 int this_class_index;
504 {
505 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
506 u1* mark = cfs->current();
507 u2 flags = cfs->get_u2_fast();
508 this_class_index = cfs->get_u2_fast();
509 cfs->set_current(mark); // revert to mark
510 }
511
512 for (index = 1; index < length; index++) { // Index 0 is unused
513 if (has_cp_patch_at(index)) {
514 guarantee_property(index != this_class_index,
515 "Illegal constant pool patch to self at %d in class file %s",
516 index, CHECK_(nullHandle));
517 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
518 }
519 }
520 }
521
522 if (!_need_verify) {
523 return cp;
524 }
525
526 // second verification pass - checks the strings are of the right format.
527 // but not yet to the other entries
528 for (index = 1; index < length; index++) {
529 jbyte tag = cp->tag_at(index).value();
530 switch (tag) {
531 case JVM_CONSTANT_UnresolvedClass: {
532 Symbol* class_name = cp->klass_name_at(index);
533 // check the name, even if _cp_patches will overwrite it
534 verify_legal_class_name(class_name, CHECK_(nullHandle));
535 break;
536 }
537 case JVM_CONSTANT_NameAndType: {
538 if (_need_verify && _major_version >= JAVA_7_VERSION) {
539 int sig_index = cp->signature_ref_index_at(index);
540 int name_index = cp->name_ref_index_at(index);
541 Symbol* name = cp->symbol_at(name_index);
542 Symbol* sig = cp->symbol_at(sig_index);
543 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
544 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
545 } else {
546 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
547 }
548 }
549 break;
550 }
551 case JVM_CONSTANT_InvokeDynamic:
552 case JVM_CONSTANT_Fieldref:
553 case JVM_CONSTANT_Methodref:
554 case JVM_CONSTANT_InterfaceMethodref: {
555 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
556 // already verified to be utf8
557 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
558 // already verified to be utf8
559 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
560 Symbol* name = cp->symbol_at(name_ref_index);
561 Symbol* signature = cp->symbol_at(signature_ref_index);
562 if (tag == JVM_CONSTANT_Fieldref) {
563 verify_legal_field_name(name, CHECK_(nullHandle));
564 if (_need_verify && _major_version >= JAVA_7_VERSION) {
565 // Signature is verified above, when iterating NameAndType_info.
566 // Need only to be sure it's the right type.
567 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
568 throwIllegalSignature(
569 "Field", name, signature, CHECK_(nullHandle));
570 }
571 } else {
572 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
573 }
574 } else {
575 verify_legal_method_name(name, CHECK_(nullHandle));
576 if (_need_verify && _major_version >= JAVA_7_VERSION) {
577 // Signature is verified above, when iterating NameAndType_info.
578 // Need only to be sure it's the right type.
579 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
580 throwIllegalSignature(
581 "Method", name, signature, CHECK_(nullHandle));
582 }
583 } else {
584 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
585 }
586 if (tag == JVM_CONSTANT_Methodref) {
587 // 4509014: If a class method name begins with '<', it must be "<init>".
588 assert(name != NULL, "method name in constant pool is null");
589 unsigned int name_len = name->utf8_length();
590 assert(name_len > 0, "bad method name"); // already verified as legal name
591 if (name->byte_at(0) == '<') {
592 if (name != vmSymbols::object_initializer_name()) {
593 classfile_parse_error(
594 "Bad method name at constant pool index %u in class file %s",
595 name_ref_index, CHECK_(nullHandle));
596 }
597 }
598 }
599 }
600 break;
601 }
602 case JVM_CONSTANT_MethodHandle: {
603 int ref_index = cp->method_handle_index_at(index);
604 int ref_kind = cp->method_handle_ref_kind_at(index);
605 switch (ref_kind) {
606 case JVM_REF_invokeVirtual:
607 case JVM_REF_invokeStatic:
608 case JVM_REF_invokeSpecial:
609 case JVM_REF_newInvokeSpecial:
610 {
611 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
612 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
613 Symbol* name = cp->symbol_at(name_ref_index);
614 if (ref_kind == JVM_REF_newInvokeSpecial) {
615 if (name != vmSymbols::object_initializer_name()) {
616 classfile_parse_error(
617 "Bad constructor name at constant pool index %u in class file %s",
618 name_ref_index, CHECK_(nullHandle));
619 }
620 } else {
621 if (name == vmSymbols::object_initializer_name()) {
622 classfile_parse_error(
623 "Bad method name at constant pool index %u in class file %s",
624 name_ref_index, CHECK_(nullHandle));
625 }
626 }
627 }
628 break;
629 // Other ref_kinds are already fully checked in previous pass.
630 }
631 break;
632 }
633 case JVM_CONSTANT_MethodType: {
634 Symbol* no_name = vmSymbols::type_name(); // place holder
635 Symbol* signature = cp->method_type_signature_at(index);
636 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
637 break;
638 }
639 case JVM_CONSTANT_Utf8: {
640 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
641 }
642 } // end of switch
643 } // end of for
644
645 return cp;
646 }
647
648
649 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
650 BasicType patch_type = T_VOID;
651
652 switch (cp->tag_at(index).value()) {
653
654 case JVM_CONSTANT_UnresolvedClass :
655 // Patching a class means pre-resolving it.
656 // The name in the constant pool is ignored.
657 if (java_lang_Class::is_instance(patch())) {
658 guarantee_property(!java_lang_Class::is_primitive(patch()),
659 "Illegal class patch at %d in class file %s",
660 index, CHECK);
661 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
662 } else {
663 guarantee_property(java_lang_String::is_instance(patch()),
664 "Illegal class patch at %d in class file %s",
665 index, CHECK);
666 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
667 cp->unresolved_klass_at_put(index, name);
668 }
669 break;
670
671 case JVM_CONSTANT_String :
672 // skip this patch and don't clear it. Needs the oop array for resolved
673 // references to be created first.
674 return;
675
676 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
677 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
678 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
679 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
680 patch_prim:
681 {
682 jvalue value;
683 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
684 guarantee_property(value_type == patch_type,
685 "Illegal primitive patch at %d in class file %s",
686 index, CHECK);
687 switch (value_type) {
688 case T_INT: cp->int_at_put(index, value.i); break;
689 case T_FLOAT: cp->float_at_put(index, value.f); break;
690 case T_LONG: cp->long_at_put(index, value.j); break;
691 case T_DOUBLE: cp->double_at_put(index, value.d); break;
692 default: assert(false, "");
693 }
694 }
695 break;
696
697 default:
698 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
699 guarantee_property(!has_cp_patch_at(index),
700 "Illegal unexpected patch at %d in class file %s",
701 index, CHECK);
702 return;
703 }
704
705 // On fall-through, mark the patch as used.
706 clear_cp_patch_at(index);
707 }
708
709
710 class NameSigHash: public ResourceObj {
711 public:
712 Symbol* _name; // name
713 Symbol* _sig; // signature
714 NameSigHash* _next; // Next entry in hash table
715 };
716
717
718 #define HASH_ROW_SIZE 256
719
720 unsigned int hash(Symbol* name, Symbol* sig) {
721 unsigned int raw_hash = 0;
722 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
723 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
724
725 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
726 }
727
728
729 void initialize_hashtable(NameSigHash** table) {
730 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
731 }
732
733 // Return false if the name/sig combination is found in table.
734 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
735 // The old format checker uses heap sort to find duplicates.
736 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
737 // of table since we don't expect Symbol*'s to move.
738 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
739 assert(name != NULL, "name in constant pool is NULL");
740
741 // First lookup for duplicates
742 int index = hash(name, sig);
743 NameSigHash* entry = table[index];
744 while (entry != NULL) {
745 if (entry->_name == name && entry->_sig == sig) {
746 return false;
747 }
748 entry = entry->_next;
749 }
750
751 // No duplicate is found, allocate a new entry and fill it.
752 entry = new NameSigHash();
753 entry->_name = name;
754 entry->_sig = sig;
755
756 // Insert into hash table
757 entry->_next = table[index];
758 table[index] = entry;
759
760 return true;
761 }
762
763
764 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
765 Handle protection_domain,
766 Symbol* class_name,
767 bool* has_default_methods,
768 TRAPS) {
769 if (length == 0) {
770 _local_interfaces = Universe::the_empty_klass_array();
771 } else {
772 ClassFileStream* cfs = stream();
773 assert(length > 0, "only called for length>0");
774 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
775
776 int index;
777 for (index = 0; index < length; index++) {
778 u2 interface_index = cfs->get_u2(CHECK_NULL);
779 KlassHandle interf;
780 check_property(
781 valid_klass_reference_at(interface_index),
782 "Interface name has bad constant pool index %u in class file %s",
783 interface_index, CHECK_NULL);
784 if (_cp->tag_at(interface_index).is_klass()) {
785 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
786 } else {
787 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
788
789 // Don't need to check legal name because it's checked when parsing constant pool.
790 // But need to make sure it's not an array type.
791 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
792 "Bad interface name in class file %s", CHECK_NULL);
793 Handle class_loader(THREAD, _loader_data->class_loader());
794
795 // Call resolve_super so classcircularity is checked
796 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
797 unresolved_klass, class_loader, protection_domain,
798 false, CHECK_NULL);
799 interf = KlassHandle(THREAD, k);
800 }
801
802 if (!interf()->is_interface()) {
803 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
804 }
805 if (InstanceKlass::cast(interf())->has_default_methods()) {
806 *has_default_methods = true;
807 }
808 _local_interfaces->at_put(index, interf());
809 }
810
811 if (!_need_verify || length <= 1) {
812 return _local_interfaces;
813 }
814
815 // Check if there's any duplicates in interfaces
816 ResourceMark rm(THREAD);
817 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
818 THREAD, NameSigHash*, HASH_ROW_SIZE);
819 initialize_hashtable(interface_names);
820 bool dup = false;
821 {
822 debug_only(No_Safepoint_Verifier nsv;)
823 for (index = 0; index < length; index++) {
824 Klass* k = _local_interfaces->at(index);
825 Symbol* name = InstanceKlass::cast(k)->name();
826 // If no duplicates, add (name, NULL) in hashtable interface_names.
827 if (!put_after_lookup(name, NULL, interface_names)) {
828 dup = true;
829 break;
830 }
831 }
832 }
833 if (dup) {
834 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
835 }
836 }
837 return _local_interfaces;
838 }
839
840
841 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
842 // Make sure the constant pool entry is of a type appropriate to this field
843 guarantee_property(
844 (constantvalue_index > 0 &&
845 constantvalue_index < _cp->length()),
846 "Bad initial value index %u in ConstantValue attribute in class file %s",
847 constantvalue_index, CHECK);
848 constantTag value_type = _cp->tag_at(constantvalue_index);
849 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
850 case T_LONG:
851 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
852 break;
853 case T_FLOAT:
854 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
855 break;
856 case T_DOUBLE:
857 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
858 break;
859 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
860 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
861 break;
862 case T_OBJECT:
863 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
864 && value_type.is_string()),
865 "Bad string initial value in class file %s", CHECK);
866 break;
867 default:
868 classfile_parse_error(
869 "Unable to set initial value %u in class file %s",
870 constantvalue_index, CHECK);
871 }
872 }
873
874
875 // Parse attributes for a field.
876 void ClassFileParser::parse_field_attributes(u2 attributes_count,
877 bool is_static, u2 signature_index,
878 u2* constantvalue_index_addr,
879 bool* is_synthetic_addr,
880 u2* generic_signature_index_addr,
881 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
882 TRAPS) {
883 ClassFileStream* cfs = stream();
884 assert(attributes_count > 0, "length should be greater than 0");
885 u2 constantvalue_index = 0;
886 u2 generic_signature_index = 0;
887 bool is_synthetic = false;
888 u1* runtime_visible_annotations = NULL;
889 int runtime_visible_annotations_length = 0;
890 u1* runtime_invisible_annotations = NULL;
891 int runtime_invisible_annotations_length = 0;
892 u1* runtime_visible_type_annotations = NULL;
893 int runtime_visible_type_annotations_length = 0;
894 u1* runtime_invisible_type_annotations = NULL;
895 int runtime_invisible_type_annotations_length = 0;
896 bool runtime_invisible_annotations_exists = false;
897 bool runtime_invisible_type_annotations_exists = false;
898 while (attributes_count--) {
899 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
900 u2 attribute_name_index = cfs->get_u2_fast();
901 u4 attribute_length = cfs->get_u4_fast();
902 check_property(valid_symbol_at(attribute_name_index),
903 "Invalid field attribute index %u in class file %s",
904 attribute_name_index,
905 CHECK);
906 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
907 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
908 // ignore if non-static
909 if (constantvalue_index != 0) {
910 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
911 }
912 check_property(
913 attribute_length == 2,
914 "Invalid ConstantValue field attribute length %u in class file %s",
915 attribute_length, CHECK);
916 constantvalue_index = cfs->get_u2(CHECK);
917 if (_need_verify) {
918 verify_constantvalue(constantvalue_index, signature_index, CHECK);
919 }
920 } else if (attribute_name == vmSymbols::tag_synthetic()) {
921 if (attribute_length != 0) {
922 classfile_parse_error(
923 "Invalid Synthetic field attribute length %u in class file %s",
924 attribute_length, CHECK);
925 }
926 is_synthetic = true;
927 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
928 if (attribute_length != 0) {
929 classfile_parse_error(
930 "Invalid Deprecated field attribute length %u in class file %s",
931 attribute_length, CHECK);
932 }
933 } else if (_major_version >= JAVA_1_5_VERSION) {
934 if (attribute_name == vmSymbols::tag_signature()) {
935 if (attribute_length != 2) {
936 classfile_parse_error(
937 "Wrong size %u for field's Signature attribute in class file %s",
938 attribute_length, CHECK);
939 }
940 generic_signature_index = parse_generic_signature_attribute(CHECK);
941 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
942 if (runtime_visible_annotations != NULL) {
943 classfile_parse_error(
944 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
945 }
946 runtime_visible_annotations_length = attribute_length;
947 runtime_visible_annotations = cfs->get_u1_buffer();
948 assert(runtime_visible_annotations != NULL, "null visible annotations");
949 parse_annotations(runtime_visible_annotations,
950 runtime_visible_annotations_length,
951 parsed_annotations);
952 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
953 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
954 if (runtime_invisible_annotations_exists) {
955 classfile_parse_error(
956 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
957 }
958 runtime_invisible_annotations_exists = true;
959 if (PreserveAllAnnotations) {
960 runtime_invisible_annotations_length = attribute_length;
961 runtime_invisible_annotations = cfs->get_u1_buffer();
962 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
963 }
964 cfs->skip_u1(attribute_length, CHECK);
965 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
966 if (runtime_visible_type_annotations != NULL) {
967 classfile_parse_error(
968 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
969 }
970 runtime_visible_type_annotations_length = attribute_length;
971 runtime_visible_type_annotations = cfs->get_u1_buffer();
972 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
973 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
974 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
975 if (runtime_invisible_type_annotations_exists) {
976 classfile_parse_error(
977 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
978 } else {
979 runtime_invisible_type_annotations_exists = true;
980 }
981 if (PreserveAllAnnotations) {
982 runtime_invisible_type_annotations_length = attribute_length;
983 runtime_invisible_type_annotations = cfs->get_u1_buffer();
984 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
985 }
986 cfs->skip_u1(attribute_length, CHECK);
987 } else {
988 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
989 }
990 } else {
991 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
992 }
993 }
994
995 *constantvalue_index_addr = constantvalue_index;
996 *is_synthetic_addr = is_synthetic;
997 *generic_signature_index_addr = generic_signature_index;
998 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
999 runtime_visible_annotations_length,
1000 runtime_invisible_annotations,
1001 runtime_invisible_annotations_length,
1002 CHECK);
1003 parsed_annotations->set_field_annotations(a);
1004 a = assemble_annotations(runtime_visible_type_annotations,
1005 runtime_visible_type_annotations_length,
1006 runtime_invisible_type_annotations,
1007 runtime_invisible_type_annotations_length,
1008 CHECK);
1009 parsed_annotations->set_field_type_annotations(a);
1010 return;
1011 }
1012
1013
1014 // Field allocation types. Used for computing field offsets.
1015
1016 enum FieldAllocationType {
1017 STATIC_OOP, // Oops
1018 STATIC_BYTE, // Boolean, Byte, char
1019 STATIC_SHORT, // shorts
1020 STATIC_WORD, // ints
1021 STATIC_DOUBLE, // aligned long or double
1022 NONSTATIC_OOP,
1023 NONSTATIC_BYTE,
1024 NONSTATIC_SHORT,
1025 NONSTATIC_WORD,
1026 NONSTATIC_DOUBLE,
1027 MAX_FIELD_ALLOCATION_TYPE,
1028 BAD_ALLOCATION_TYPE = -1
1029 };
1030
1031 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1032 BAD_ALLOCATION_TYPE, // 0
1033 BAD_ALLOCATION_TYPE, // 1
1034 BAD_ALLOCATION_TYPE, // 2
1035 BAD_ALLOCATION_TYPE, // 3
1036 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1037 NONSTATIC_SHORT, // T_CHAR = 5,
1038 NONSTATIC_WORD, // T_FLOAT = 6,
1039 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1040 NONSTATIC_BYTE, // T_BYTE = 8,
1041 NONSTATIC_SHORT, // T_SHORT = 9,
1042 NONSTATIC_WORD, // T_INT = 10,
1043 NONSTATIC_DOUBLE, // T_LONG = 11,
1044 NONSTATIC_OOP, // T_OBJECT = 12,
1045 NONSTATIC_OOP, // T_ARRAY = 13,
1046 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1047 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1048 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1049 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1050 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1051 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1052 BAD_ALLOCATION_TYPE, // 0
1053 BAD_ALLOCATION_TYPE, // 1
1054 BAD_ALLOCATION_TYPE, // 2
1055 BAD_ALLOCATION_TYPE, // 3
1056 STATIC_BYTE , // T_BOOLEAN = 4,
1057 STATIC_SHORT, // T_CHAR = 5,
1058 STATIC_WORD, // T_FLOAT = 6,
1059 STATIC_DOUBLE, // T_DOUBLE = 7,
1060 STATIC_BYTE, // T_BYTE = 8,
1061 STATIC_SHORT, // T_SHORT = 9,
1062 STATIC_WORD, // T_INT = 10,
1063 STATIC_DOUBLE, // T_LONG = 11,
1064 STATIC_OOP, // T_OBJECT = 12,
1065 STATIC_OOP, // T_ARRAY = 13,
1066 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1067 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1068 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1069 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1070 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1071 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1072 };
1073
1074 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1075 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1076 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1077 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1078 return result;
1079 }
1080
1081 class FieldAllocationCount: public ResourceObj {
1082 public:
1083 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1084
1085 FieldAllocationCount() {
1086 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1087 count[i] = 0;
1088 }
1089 }
1090
1091 FieldAllocationType update(bool is_static, BasicType type) {
1092 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1093 // Make sure there is no overflow with injected fields.
1094 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1095 count[atype]++;
1096 return atype;
1097 }
1098 };
1099
1100 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1101 bool is_interface,
1102 FieldAllocationCount *fac,
1103 u2* java_fields_count_ptr, TRAPS) {
1104 ClassFileStream* cfs = stream();
1105 cfs->guarantee_more(2, CHECK_NULL); // length
1106 u2 length = cfs->get_u2_fast();
1107 *java_fields_count_ptr = length;
1108
1109 int num_injected = 0;
1110 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1111 int total_fields = length + num_injected;
1112
1113 // The field array starts with tuples of shorts
1114 // [access, name index, sig index, initial value index, byte offset].
1115 // A generic signature slot only exists for field with generic
1116 // signature attribute. And the access flag is set with
1117 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1118 // signature slots are at the end of the field array and after all
1119 // other fields data.
1120 //
1121 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1122 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1123 // ...
1124 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1125 // [generic signature index]
1126 // [generic signature index]
1127 // ...
1128 //
1129 // Allocate a temporary resource array for field data. For each field,
1130 // a slot is reserved in the temporary array for the generic signature
1131 // index. After parsing all fields, the data are copied to a permanent
1132 // array and any unused slots will be discarded.
1133 ResourceMark rm(THREAD);
1134 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1135 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1136
1137 // The generic signature slots start after all other fields' data.
1138 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1139 int num_generic_signature = 0;
1140 for (int n = 0; n < length; n++) {
1141 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1142
1143 AccessFlags access_flags;
1144 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1145 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1146 access_flags.set_flags(flags);
1147
1148 u2 name_index = cfs->get_u2_fast();
1149 int cp_size = _cp->length();
1150 check_property(valid_symbol_at(name_index),
1151 "Invalid constant pool index %u for field name in class file %s",
1152 name_index,
1153 CHECK_NULL);
1154 Symbol* name = _cp->symbol_at(name_index);
1155 verify_legal_field_name(name, CHECK_NULL);
1156
1157 u2 signature_index = cfs->get_u2_fast();
1158 check_property(valid_symbol_at(signature_index),
1159 "Invalid constant pool index %u for field signature in class file %s",
1160 signature_index, CHECK_NULL);
1161 Symbol* sig = _cp->symbol_at(signature_index);
1162 verify_legal_field_signature(name, sig, CHECK_NULL);
1163
1164 u2 constantvalue_index = 0;
1165 bool is_synthetic = false;
1166 u2 generic_signature_index = 0;
1167 bool is_static = access_flags.is_static();
1168 FieldAnnotationCollector parsed_annotations(_loader_data);
1169
1170 u2 attributes_count = cfs->get_u2_fast();
1171 if (attributes_count > 0) {
1172 parse_field_attributes(attributes_count, is_static, signature_index,
1173 &constantvalue_index, &is_synthetic,
1174 &generic_signature_index, &parsed_annotations,
1175 CHECK_NULL);
1176 if (parsed_annotations.field_annotations() != NULL) {
1177 if (_fields_annotations == NULL) {
1178 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1179 _loader_data, length, NULL,
1180 CHECK_NULL);
1181 }
1182 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1183 parsed_annotations.set_field_annotations(NULL);
1184 }
1185 if (parsed_annotations.field_type_annotations() != NULL) {
1186 if (_fields_type_annotations == NULL) {
1187 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1188 _loader_data, length, NULL,
1189 CHECK_NULL);
1190 }
1191 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1192 parsed_annotations.set_field_type_annotations(NULL);
1193 }
1194
1195 if (is_synthetic) {
1196 access_flags.set_is_synthetic();
1197 }
1198 if (generic_signature_index != 0) {
1199 access_flags.set_field_has_generic_signature();
1200 fa[generic_signature_slot] = generic_signature_index;
1201 generic_signature_slot ++;
1202 num_generic_signature ++;
1203 }
1204 }
1205
1206 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1207 field->initialize(access_flags.as_short(),
1208 name_index,
1209 signature_index,
1210 constantvalue_index);
1211 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1212
1213 // Remember how many oops we encountered and compute allocation type
1214 FieldAllocationType atype = fac->update(is_static, type);
1215 field->set_allocation_type(atype);
1216
1217 // After field is initialized with type, we can augment it with aux info
1218 if (parsed_annotations.has_any_annotations())
1219 parsed_annotations.apply_to(field);
1220 }
1221
1222 int index = length;
1223 if (num_injected != 0) {
1224 for (int n = 0; n < num_injected; n++) {
1225 // Check for duplicates
1226 if (injected[n].may_be_java) {
1227 Symbol* name = injected[n].name();
1228 Symbol* signature = injected[n].signature();
1229 bool duplicate = false;
1230 for (int i = 0; i < length; i++) {
1231 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1232 if (name == _cp->symbol_at(f->name_index()) &&
1233 signature == _cp->symbol_at(f->signature_index())) {
1234 // Symbol is desclared in Java so skip this one
1235 duplicate = true;
1236 break;
1237 }
1238 }
1239 if (duplicate) {
1240 // These will be removed from the field array at the end
1241 continue;
1242 }
1243 }
1244
1245 // Injected field
1246 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1247 field->initialize(JVM_ACC_FIELD_INTERNAL,
1248 injected[n].name_index,
1249 injected[n].signature_index,
1250 0);
1251
1252 BasicType type = FieldType::basic_type(injected[n].signature());
1253
1254 // Remember how many oops we encountered and compute allocation type
1255 FieldAllocationType atype = fac->update(false, type);
1256 field->set_allocation_type(atype);
1257 index++;
1258 }
1259 }
1260
1261 // Now copy the fields' data from the temporary resource array.
1262 // Sometimes injected fields already exist in the Java source so
1263 // the fields array could be too long. In that case the
1264 // fields array is trimed. Also unused slots that were reserved
1265 // for generic signature indexes are discarded.
1266 Array<u2>* fields = MetadataFactory::new_array<u2>(
1267 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1268 CHECK_NULL);
1269 _fields = fields; // save in case of error
1270 {
1271 int i = 0;
1272 for (; i < index * FieldInfo::field_slots; i++) {
1273 fields->at_put(i, fa[i]);
1274 }
1275 for (int j = total_fields * FieldInfo::field_slots;
1276 j < generic_signature_slot; j++) {
1277 fields->at_put(i++, fa[j]);
1278 }
1279 assert(i == fields->length(), "");
1280 }
1281
1282 if (_need_verify && length > 1) {
1283 // Check duplicated fields
1284 ResourceMark rm(THREAD);
1285 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1286 THREAD, NameSigHash*, HASH_ROW_SIZE);
1287 initialize_hashtable(names_and_sigs);
1288 bool dup = false;
1289 {
1290 debug_only(No_Safepoint_Verifier nsv;)
1291 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1292 Symbol* name = fs.name();
1293 Symbol* sig = fs.signature();
1294 // If no duplicates, add name/signature in hashtable names_and_sigs.
1295 if (!put_after_lookup(name, sig, names_and_sigs)) {
1296 dup = true;
1297 break;
1298 }
1299 }
1300 }
1301 if (dup) {
1302 classfile_parse_error("Duplicate field name&signature in class file %s",
1303 CHECK_NULL);
1304 }
1305 }
1306
1307 return fields;
1308 }
1309
1310
1311 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1312 while (length-- > 0) {
1313 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1314 }
1315 }
1316
1317
1318 u2* ClassFileParser::parse_exception_table(u4 code_length,
1319 u4 exception_table_length,
1320 TRAPS) {
1321 ClassFileStream* cfs = stream();
1322
1323 u2* exception_table_start = cfs->get_u2_buffer();
1324 assert(exception_table_start != NULL, "null exception table");
1325 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1326 // Will check legal target after parsing code array in verifier.
1327 if (_need_verify) {
1328 for (unsigned int i = 0; i < exception_table_length; i++) {
1329 u2 start_pc = cfs->get_u2_fast();
1330 u2 end_pc = cfs->get_u2_fast();
1331 u2 handler_pc = cfs->get_u2_fast();
1332 u2 catch_type_index = cfs->get_u2_fast();
1333 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1334 "Illegal exception table range in class file %s",
1335 CHECK_NULL);
1336 guarantee_property(handler_pc < code_length,
1337 "Illegal exception table handler in class file %s",
1338 CHECK_NULL);
1339 if (catch_type_index != 0) {
1340 guarantee_property(valid_klass_reference_at(catch_type_index),
1341 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1342 }
1343 }
1344 } else {
1345 cfs->skip_u2_fast(exception_table_length * 4);
1346 }
1347 return exception_table_start;
1348 }
1349
1350 void ClassFileParser::parse_linenumber_table(
1351 u4 code_attribute_length, u4 code_length,
1352 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1353 ClassFileStream* cfs = stream();
1354 unsigned int num_entries = cfs->get_u2(CHECK);
1355
1356 // Each entry is a u2 start_pc, and a u2 line_number
1357 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1358
1359 // Verify line number attribute and table length
1360 check_property(
1361 code_attribute_length == sizeof(u2) + length_in_bytes,
1362 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1363
1364 cfs->guarantee_more(length_in_bytes, CHECK);
1365
1366 if ((*write_stream) == NULL) {
1367 if (length_in_bytes > fixed_buffer_size) {
1368 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1369 } else {
1370 (*write_stream) = new CompressedLineNumberWriteStream(
1371 linenumbertable_buffer, fixed_buffer_size);
1372 }
1373 }
1374
1375 while (num_entries-- > 0) {
1376 u2 bci = cfs->get_u2_fast(); // start_pc
1377 u2 line = cfs->get_u2_fast(); // line_number
1378 guarantee_property(bci < code_length,
1379 "Invalid pc in LineNumberTable in class file %s", CHECK);
1380 (*write_stream)->write_pair(bci, line);
1381 }
1382 }
1383
1384
1385 class LVT_Hash : public AllStatic {
1386 public:
1387
1388 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1389 /*
1390 * 3-tuple start_bci/length/slot has to be unique key,
1391 * so the following comparison seems to be redundant:
1392 * && elem->name_cp_index == entry->_elem->name_cp_index
1393 */
1394 return (e0.start_bci == e1.start_bci &&
1395 e0.length == e1.length &&
1396 e0.name_cp_index == e1.name_cp_index &&
1397 e0.slot == e1.slot);
1398 }
1399
1400 static unsigned int hash(LocalVariableTableElement const& e0) {
1401 unsigned int raw_hash = e0.start_bci;
1402
1403 raw_hash = e0.length + raw_hash * 37;
1404 raw_hash = e0.name_cp_index + raw_hash * 37;
1405 raw_hash = e0.slot + raw_hash * 37;
1406
1407 return raw_hash;
1408 }
1409 };
1410
1411
1412 // Class file LocalVariableTable elements.
1413 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1414 public:
1415 u2 start_bci;
1416 u2 length;
1417 u2 name_cp_index;
1418 u2 descriptor_cp_index;
1419 u2 slot;
1420 };
1421
1422 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1423 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1424 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1425 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1426 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1427 lvt->signature_cp_index = 0;
1428 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1429 }
1430
1431 // Function is used to parse both attributes:
1432 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1433 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1434 u2 max_locals,
1435 u4 code_attribute_length,
1436 u2* localvariable_table_length,
1437 bool isLVTT,
1438 TRAPS) {
1439 ClassFileStream* cfs = stream();
1440 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1441 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1442 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1443 // Verify local variable table attribute has right length
1444 if (_need_verify) {
1445 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1446 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1447 }
1448 u2* localvariable_table_start = cfs->get_u2_buffer();
1449 assert(localvariable_table_start != NULL, "null local variable table");
1450 if (!_need_verify) {
1451 cfs->skip_u2_fast(size);
1452 } else {
1453 cfs->guarantee_more(size * 2, CHECK_NULL);
1454 for(int i = 0; i < (*localvariable_table_length); i++) {
1455 u2 start_pc = cfs->get_u2_fast();
1456 u2 length = cfs->get_u2_fast();
1457 u2 name_index = cfs->get_u2_fast();
1458 u2 descriptor_index = cfs->get_u2_fast();
1459 u2 index = cfs->get_u2_fast();
1460 // Assign to a u4 to avoid overflow
1461 u4 end_pc = (u4)start_pc + (u4)length;
1462
1463 if (start_pc >= code_length) {
1464 classfile_parse_error(
1465 "Invalid start_pc %u in %s in class file %s",
1466 start_pc, tbl_name, CHECK_NULL);
1467 }
1468 if (end_pc > code_length) {
1469 classfile_parse_error(
1470 "Invalid length %u in %s in class file %s",
1471 length, tbl_name, CHECK_NULL);
1472 }
1473 int cp_size = _cp->length();
1474 guarantee_property(valid_symbol_at(name_index),
1475 "Name index %u in %s has bad constant type in class file %s",
1476 name_index, tbl_name, CHECK_NULL);
1477 guarantee_property(valid_symbol_at(descriptor_index),
1478 "Signature index %u in %s has bad constant type in class file %s",
1479 descriptor_index, tbl_name, CHECK_NULL);
1480
1481 Symbol* name = _cp->symbol_at(name_index);
1482 Symbol* sig = _cp->symbol_at(descriptor_index);
1483 verify_legal_field_name(name, CHECK_NULL);
1484 u2 extra_slot = 0;
1485 if (!isLVTT) {
1486 verify_legal_field_signature(name, sig, CHECK_NULL);
1487
1488 // 4894874: check special cases for double and long local variables
1489 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1490 sig == vmSymbols::type_signature(T_LONG)) {
1491 extra_slot = 1;
1492 }
1493 }
1494 guarantee_property((index + extra_slot) < max_locals,
1495 "Invalid index %u in %s in class file %s",
1496 index, tbl_name, CHECK_NULL);
1497 }
1498 }
1499 return localvariable_table_start;
1500 }
1501
1502
1503 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1504 u1* u1_array, u2* u2_array, TRAPS) {
1505 ClassFileStream* cfs = stream();
1506 u2 index = 0; // index in the array with long/double occupying two slots
1507 u4 i1 = *u1_index;
1508 u4 i2 = *u2_index + 1;
1509 for(int i = 0; i < array_length; i++) {
1510 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1511 index++;
1512 if (tag == ITEM_Long || tag == ITEM_Double) {
1513 index++;
1514 } else if (tag == ITEM_Object) {
1515 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1516 guarantee_property(valid_klass_reference_at(class_index),
1517 "Bad class index %u in StackMap in class file %s",
1518 class_index, CHECK);
1519 } else if (tag == ITEM_Uninitialized) {
1520 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1521 guarantee_property(
1522 offset < code_length,
1523 "Bad uninitialized type offset %u in StackMap in class file %s",
1524 offset, CHECK);
1525 } else {
1526 guarantee_property(
1527 tag <= (u1)ITEM_Uninitialized,
1528 "Unknown variable type %u in StackMap in class file %s",
1529 tag, CHECK);
1530 }
1531 }
1532 u2_array[*u2_index] = index;
1533 *u1_index = i1;
1534 *u2_index = i2;
1535 }
1536
1537 u1* ClassFileParser::parse_stackmap_table(
1538 u4 code_attribute_length, TRAPS) {
1539 if (code_attribute_length == 0)
1540 return NULL;
1541
1542 ClassFileStream* cfs = stream();
1543 u1* stackmap_table_start = cfs->get_u1_buffer();
1544 assert(stackmap_table_start != NULL, "null stackmap table");
1545
1546 // check code_attribute_length first
1547 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1548
1549 if (!_need_verify && !DumpSharedSpaces) {
1550 return NULL;
1551 }
1552 return stackmap_table_start;
1553 }
1554
1555 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1556 u4 method_attribute_length,
1557 TRAPS) {
1558 ClassFileStream* cfs = stream();
1559 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1560 *checked_exceptions_length = cfs->get_u2_fast();
1561 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1562 u2* checked_exceptions_start = cfs->get_u2_buffer();
1563 assert(checked_exceptions_start != NULL, "null checked exceptions");
1564 if (!_need_verify) {
1565 cfs->skip_u2_fast(size);
1566 } else {
1567 // Verify each value in the checked exception table
1568 u2 checked_exception;
1569 u2 len = *checked_exceptions_length;
1570 cfs->guarantee_more(2 * len, CHECK_NULL);
1571 for (int i = 0; i < len; i++) {
1572 checked_exception = cfs->get_u2_fast();
1573 check_property(
1574 valid_klass_reference_at(checked_exception),
1575 "Exception name has bad type at constant pool %u in class file %s",
1576 checked_exception, CHECK_NULL);
1577 }
1578 }
1579 // check exceptions attribute length
1580 if (_need_verify) {
1581 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1582 sizeof(u2) * size),
1583 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1584 }
1585 return checked_exceptions_start;
1586 }
1587
1588 void ClassFileParser::throwIllegalSignature(
1589 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1590 ResourceMark rm(THREAD);
1591 Exceptions::fthrow(THREAD_AND_LOCATION,
1592 vmSymbols::java_lang_ClassFormatError(),
1593 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1594 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1595 }
1596
1597 // Skip an annotation. Return >=limit if there is any problem.
1598 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1599 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1600 // value := switch (tag:u1) { ... }
1601 index += 2; // skip atype
1602 if ((index += 2) >= limit) return limit; // read nmem
1603 int nmem = Bytes::get_Java_u2(buffer+index-2);
1604 while (--nmem >= 0 && index < limit) {
1605 index += 2; // skip member
1606 index = skip_annotation_value(buffer, limit, index);
1607 }
1608 return index;
1609 }
1610
1611 // Skip an annotation value. Return >=limit if there is any problem.
1612 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1613 // value := switch (tag:u1) {
1614 // case B, C, I, S, Z, D, F, J, c: con:u2;
1615 // case e: e_class:u2 e_name:u2;
1616 // case s: s_con:u2;
1617 // case [: do(nval:u2) {value};
1618 // case @: annotation;
1619 // case s: s_con:u2;
1620 // }
1621 if ((index += 1) >= limit) return limit; // read tag
1622 u1 tag = buffer[index-1];
1623 switch (tag) {
1624 case 'B': case 'C': case 'I': case 'S': case 'Z':
1625 case 'D': case 'F': case 'J': case 'c': case 's':
1626 index += 2; // skip con or s_con
1627 break;
1628 case 'e':
1629 index += 4; // skip e_class, e_name
1630 break;
1631 case '[':
1632 {
1633 if ((index += 2) >= limit) return limit; // read nval
1634 int nval = Bytes::get_Java_u2(buffer+index-2);
1635 while (--nval >= 0 && index < limit) {
1636 index = skip_annotation_value(buffer, limit, index);
1637 }
1638 }
1639 break;
1640 case '@':
1641 index = skip_annotation(buffer, limit, index);
1642 break;
1643 default:
1644 return limit; // bad tag byte
1645 }
1646 return index;
1647 }
1648
1649 // Sift through annotations, looking for those significant to the VM:
1650 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1651 ClassFileParser::AnnotationCollector* coll) {
1652 // annotations := do(nann:u2) {annotation}
1653 int index = 0;
1654 if ((index += 2) >= limit) return; // read nann
1655 int nann = Bytes::get_Java_u2(buffer+index-2);
1656 enum { // initial annotation layout
1657 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1658 count_off = 2, // u2 such as 1 (one value)
1659 member_off = 4, // utf8 such as 'value'
1660 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1661 e_tag_val = 'e',
1662 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1663 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1664 e_size = 11, // end of 'e' annotation
1665 c_tag_val = 'c', // payload is type
1666 c_con_off = 7, // utf8 payload, such as 'I'
1667 c_size = 9, // end of 'c' annotation
1668 s_tag_val = 's', // payload is String
1669 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1670 s_size = 9,
1671 min_size = 6 // smallest possible size (zero members)
1672 };
1673 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1674 int index0 = index;
1675 index = skip_annotation(buffer, limit, index);
1676 u1* abase = buffer + index0;
1677 int atype = Bytes::get_Java_u2(abase + atype_off);
1678 int count = Bytes::get_Java_u2(abase + count_off);
1679 Symbol* aname = check_symbol_at(_cp, atype);
1680 if (aname == NULL) break; // invalid annotation name
1681 Symbol* member = NULL;
1682 if (count >= 1) {
1683 int member_index = Bytes::get_Java_u2(abase + member_off);
1684 member = check_symbol_at(_cp, member_index);
1685 if (member == NULL) break; // invalid member name
1686 }
1687
1688 // Here is where parsing particular annotations will take place.
1689 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1690 if (id == AnnotationCollector::_unknown) continue;
1691 coll->set_annotation(id);
1692
1693 if (id == AnnotationCollector::_sun_misc_Contended) {
1694 // @Contended can optionally specify the contention group.
1695 //
1696 // Contended group defines the equivalence class over the fields:
1697 // the fields within the same contended group are not treated distinct.
1698 // The only exception is default group, which does not incur the
1699 // equivalence. Naturally, contention group for classes is meaningless.
1700 //
1701 // While the contention group is specified as String, annotation
1702 // values are already interned, and we might as well use the constant
1703 // pool index as the group tag.
1704 //
1705 u2 group_index = 0; // default contended group
1706 if (count == 1
1707 && s_size == (index - index0) // match size
1708 && s_tag_val == *(abase + tag_off)
1709 && member == vmSymbols::value_name()) {
1710 group_index = Bytes::get_Java_u2(abase + s_con_off);
1711 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1712 group_index = 0; // default contended group
1713 }
1714 }
1715 coll->set_contended_group(group_index);
1716 }
1717 }
1718 }
1719
1720 ClassFileParser::AnnotationCollector::ID
1721 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1722 Symbol* name) {
1723 vmSymbols::SID sid = vmSymbols::find_sid(name);
1724 // Privileged code can use all annotations. Other code silently drops some.
1725 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1726 loader_data->is_ext_class_loader_data() ||
1727 loader_data->is_anonymous();
1728 switch (sid) {
1729 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1730 if (_location != _in_method) break; // only allow for methods
1731 if (!privileged) break; // only allow in privileged code
1732 return _method_CallerSensitive;
1733 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1734 if (_location != _in_method) break; // only allow for methods
1735 if (!privileged) break; // only allow in privileged code
1736 return _method_ForceInline;
1737 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1738 if (_location != _in_method) break; // only allow for methods
1739 if (!privileged) break; // only allow in privileged code
1740 return _method_DontInline;
1741 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1742 if (_location != _in_method) break; // only allow for methods
1743 if (!privileged) break; // only allow in privileged code
1744 return _method_InjectedProfile;
1745 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1746 if (_location != _in_method) break; // only allow for methods
1747 if (!privileged) break; // only allow in privileged code
1748 return _method_LambdaForm_Compiled;
1749 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1750 if (_location != _in_method) break; // only allow for methods
1751 if (!privileged) break; // only allow in privileged code
1752 return _method_LambdaForm_Hidden;
1753 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature):
1754 if (_location != _in_method) break; // only allow for methods
1755 if (!privileged) break; // only allow in privileged code
1756 return _method_HotSpotIntrinsicCandidate;
1757 #if INCLUDE_JVMCI
1758 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_Stable_signature):
1759 if (_location != _in_field) break; // only allow for fields
1760 if (!privileged) break; // only allow in privileged code
1761 return _field_Stable;
1762 #endif
1763 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1764 if (_location != _in_field) break; // only allow for fields
1765 if (!privileged) break; // only allow in privileged code
1766 return _field_Stable;
1767 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1768 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1769 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1770 return _sun_misc_Contended;
1771 default: break;
1772 }
1773 return AnnotationCollector::_unknown;
1774 }
1775
1776 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1777 if (is_contended())
1778 f->set_contended_group(contended_group());
1779 if (is_stable())
1780 f->set_stable(true);
1781 }
1782
1783 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1784 // If there's an error deallocate metadata for field annotations
1785 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1786 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1787 }
1788
1789 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1790 if (has_annotation(_method_CallerSensitive))
1791 m->set_caller_sensitive(true);
1792 if (has_annotation(_method_ForceInline))
1793 m->set_force_inline(true);
1794 if (has_annotation(_method_DontInline))
1795 m->set_dont_inline(true);
1796 if (has_annotation(_method_InjectedProfile))
1797 m->set_has_injected_profile(true);
1798 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1799 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1800 if (has_annotation(_method_LambdaForm_Hidden))
1801 m->set_hidden(true);
1802 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
1803 m->set_intrinsic_candidate(true);
1804 }
1805
1806 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1807 k->set_is_contended(is_contended());
1808 }
1809
1810
1811 #define MAX_ARGS_SIZE 255
1812 #define MAX_CODE_SIZE 65535
1813 #define INITIAL_MAX_LVT_NUMBER 256
1814
1815 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1816 *
1817 * Rules for LVT's and LVTT's are:
1818 * - There can be any number of LVT's and LVTT's.
1819 * - If there are n LVT's, it is the same as if there was just
1820 * one LVT containing all the entries from the n LVT's.
1821 * - There may be no more than one LVT entry per local variable.
1822 * Two LVT entries are 'equal' if these fields are the same:
1823 * start_pc, length, name, slot
1824 * - There may be no more than one LVTT entry per each LVT entry.
1825 * Each LVTT entry has to match some LVT entry.
1826 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1827 */
1828 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1829 int lvt_cnt,
1830 u2* localvariable_table_length,
1831 u2** localvariable_table_start,
1832 int lvtt_cnt,
1833 u2* localvariable_type_table_length,
1834 u2** localvariable_type_table_start,
1835 TRAPS) {
1836
1837 ResourceMark rm(THREAD);
1838
1839 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1840 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1841
1842 LVT_HashTable* table = new LVT_HashTable();
1843
1844 // To fill LocalVariableTable in
1845 Classfile_LVT_Element* cf_lvt;
1846 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1847
1848 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1849 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1850 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1851 copy_lvt_element(&cf_lvt[idx], lvt);
1852 // If no duplicates, add LVT elem in hashtable.
1853 if (table->put(*lvt, lvt) == false
1854 && _need_verify
1855 && _major_version >= JAVA_1_5_VERSION) {
1856 classfile_parse_error("Duplicated LocalVariableTable attribute "
1857 "entry for '%s' in class file %s",
1858 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1859 CHECK);
1860 }
1861 }
1862 }
1863
1864 // To merge LocalVariableTable and LocalVariableTypeTable
1865 Classfile_LVT_Element* cf_lvtt;
1866 LocalVariableTableElement lvtt_elem;
1867
1868 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1869 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1870 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1871 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1872 LocalVariableTableElement** entry = table->get(lvtt_elem);
1873 if (entry == NULL) {
1874 if (_need_verify) {
1875 classfile_parse_error("LVTT entry for '%s' in class file %s "
1876 "does not match any LVT entry",
1877 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1878 CHECK);
1879 }
1880 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1881 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1882 "entry for '%s' in class file %s",
1883 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1884 CHECK);
1885 } else {
1886 // to add generic signatures into LocalVariableTable
1887 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1888 }
1889 }
1890 }
1891 }
1892
1893
1894 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1895 u1* runtime_visible_annotations,
1896 int runtime_visible_annotations_length,
1897 u1* runtime_invisible_annotations,
1898 int runtime_invisible_annotations_length,
1899 u1* runtime_visible_parameter_annotations,
1900 int runtime_visible_parameter_annotations_length,
1901 u1* runtime_invisible_parameter_annotations,
1902 int runtime_invisible_parameter_annotations_length,
1903 u1* runtime_visible_type_annotations,
1904 int runtime_visible_type_annotations_length,
1905 u1* runtime_invisible_type_annotations,
1906 int runtime_invisible_type_annotations_length,
1907 u1* annotation_default,
1908 int annotation_default_length,
1909 TRAPS) {
1910
1911 AnnotationArray* a;
1912
1913 if (runtime_visible_annotations_length +
1914 runtime_invisible_annotations_length > 0) {
1915 a = assemble_annotations(runtime_visible_annotations,
1916 runtime_visible_annotations_length,
1917 runtime_invisible_annotations,
1918 runtime_invisible_annotations_length,
1919 CHECK);
1920 cm->set_method_annotations(a);
1921 }
1922
1923 if (runtime_visible_parameter_annotations_length +
1924 runtime_invisible_parameter_annotations_length > 0) {
1925 a = assemble_annotations(runtime_visible_parameter_annotations,
1926 runtime_visible_parameter_annotations_length,
1927 runtime_invisible_parameter_annotations,
1928 runtime_invisible_parameter_annotations_length,
1929 CHECK);
1930 cm->set_parameter_annotations(a);
1931 }
1932
1933 if (annotation_default_length > 0) {
1934 a = assemble_annotations(annotation_default,
1935 annotation_default_length,
1936 NULL,
1937 0,
1938 CHECK);
1939 cm->set_default_annotations(a);
1940 }
1941
1942 if (runtime_visible_type_annotations_length +
1943 runtime_invisible_type_annotations_length > 0) {
1944 a = assemble_annotations(runtime_visible_type_annotations,
1945 runtime_visible_type_annotations_length,
1946 runtime_invisible_type_annotations,
1947 runtime_invisible_type_annotations_length,
1948 CHECK);
1949 cm->set_type_annotations(a);
1950 }
1951 }
1952
1953
1954 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1955 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1956 // Method* to save footprint, so we only know the size of the resulting Method* when the
1957 // entire method attribute is parsed.
1958 //
1959 // The promoted_flags parameter is used to pass relevant access_flags
1960 // from the method back up to the containing klass. These flag values
1961 // are added to klass's access_flags.
1962
1963 methodHandle ClassFileParser::parse_method(bool is_interface,
1964 AccessFlags *promoted_flags,
1965 TRAPS) {
1966 ClassFileStream* cfs = stream();
1967 methodHandle nullHandle;
1968 ResourceMark rm(THREAD);
1969 // Parse fixed parts
1970 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1971
1972 int flags = cfs->get_u2_fast();
1973 u2 name_index = cfs->get_u2_fast();
1974 int cp_size = _cp->length();
1975 check_property(
1976 valid_symbol_at(name_index),
1977 "Illegal constant pool index %u for method name in class file %s",
1978 name_index, CHECK_(nullHandle));
1979 Symbol* name = _cp->symbol_at(name_index);
1980 verify_legal_method_name(name, CHECK_(nullHandle));
1981
1982 u2 signature_index = cfs->get_u2_fast();
1983 guarantee_property(
1984 valid_symbol_at(signature_index),
1985 "Illegal constant pool index %u for method signature in class file %s",
1986 signature_index, CHECK_(nullHandle));
1987 Symbol* signature = _cp->symbol_at(signature_index);
1988
1989 AccessFlags access_flags;
1990 if (name == vmSymbols::class_initializer_name()) {
1991 // We ignore the other access flags for a valid class initializer.
1992 // (JVM Spec 2nd ed., chapter 4.6)
1993 if (_major_version < 51) { // backward compatibility
1994 flags = JVM_ACC_STATIC;
1995 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1996 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1997 } else {
1998 // As of major_version 51, a method named <clinit> without ACC_STATIC is
1999 // just another method. So, do a normal method modifer check.
2000 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2001 }
2002 } else {
2003 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2004 }
2005
2006 if (name == vmSymbols::object_initializer_name() && is_interface) {
2007 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_(nullHandle));
2008 }
2009
2010 int args_size = -1; // only used when _need_verify is true
2011 if (_need_verify) {
2012 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2013 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2014 if (args_size > MAX_ARGS_SIZE) {
2015 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2016 }
2017 }
2018
2019 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2020
2021 // Default values for code and exceptions attribute elements
2022 u2 max_stack = 0;
2023 u2 max_locals = 0;
2024 u4 code_length = 0;
2025 u1* code_start = 0;
2026 u2 exception_table_length = 0;
2027 u2* exception_table_start = NULL;
2028 Array<int>* exception_handlers = Universe::the_empty_int_array();
2029 u2 checked_exceptions_length = 0;
2030 u2* checked_exceptions_start = NULL;
2031 CompressedLineNumberWriteStream* linenumber_table = NULL;
2032 int linenumber_table_length = 0;
2033 int total_lvt_length = 0;
2034 u2 lvt_cnt = 0;
2035 u2 lvtt_cnt = 0;
2036 bool lvt_allocated = false;
2037 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2038 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2039 u2* localvariable_table_length = NULL;
2040 u2** localvariable_table_start = NULL;
2041 u2* localvariable_type_table_length = NULL;
2042 u2** localvariable_type_table_start = NULL;
2043 int method_parameters_length = -1;
2044 u1* method_parameters_data = NULL;
2045 bool method_parameters_seen = false;
2046 bool parsed_code_attribute = false;
2047 bool parsed_checked_exceptions_attribute = false;
2048 bool parsed_stackmap_attribute = false;
2049 // stackmap attribute - JDK1.5
2050 u1* stackmap_data = NULL;
2051 int stackmap_data_length = 0;
2052 u2 generic_signature_index = 0;
2053 MethodAnnotationCollector parsed_annotations;
2054 u1* runtime_visible_annotations = NULL;
2055 int runtime_visible_annotations_length = 0;
2056 u1* runtime_invisible_annotations = NULL;
2057 int runtime_invisible_annotations_length = 0;
2058 u1* runtime_visible_parameter_annotations = NULL;
2059 int runtime_visible_parameter_annotations_length = 0;
2060 u1* runtime_invisible_parameter_annotations = NULL;
2061 int runtime_invisible_parameter_annotations_length = 0;
2062 u1* runtime_visible_type_annotations = NULL;
2063 int runtime_visible_type_annotations_length = 0;
2064 u1* runtime_invisible_type_annotations = NULL;
2065 int runtime_invisible_type_annotations_length = 0;
2066 bool runtime_invisible_annotations_exists = false;
2067 bool runtime_invisible_type_annotations_exists = false;
2068 bool runtime_invisible_parameter_annotations_exists = false;
2069 u1* annotation_default = NULL;
2070 int annotation_default_length = 0;
2071
2072 // Parse code and exceptions attribute
2073 u2 method_attributes_count = cfs->get_u2_fast();
2074 while (method_attributes_count--) {
2075 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2076 u2 method_attribute_name_index = cfs->get_u2_fast();
2077 u4 method_attribute_length = cfs->get_u4_fast();
2078 check_property(
2079 valid_symbol_at(method_attribute_name_index),
2080 "Invalid method attribute name index %u in class file %s",
2081 method_attribute_name_index, CHECK_(nullHandle));
2082
2083 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2084 if (method_attribute_name == vmSymbols::tag_code()) {
2085 // Parse Code attribute
2086 if (_need_verify) {
2087 guarantee_property(
2088 !access_flags.is_native() && !access_flags.is_abstract(),
2089 "Code attribute in native or abstract methods in class file %s",
2090 CHECK_(nullHandle));
2091 }
2092 if (parsed_code_attribute) {
2093 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2094 }
2095 parsed_code_attribute = true;
2096
2097 // Stack size, locals size, and code size
2098 if (_major_version == 45 && _minor_version <= 2) {
2099 cfs->guarantee_more(4, CHECK_(nullHandle));
2100 max_stack = cfs->get_u1_fast();
2101 max_locals = cfs->get_u1_fast();
2102 code_length = cfs->get_u2_fast();
2103 } else {
2104 cfs->guarantee_more(8, CHECK_(nullHandle));
2105 max_stack = cfs->get_u2_fast();
2106 max_locals = cfs->get_u2_fast();
2107 code_length = cfs->get_u4_fast();
2108 }
2109 if (_need_verify) {
2110 guarantee_property(args_size <= max_locals,
2111 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2112 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2113 "Invalid method Code length %u in class file %s",
2114 code_length, CHECK_(nullHandle));
2115 }
2116 // Code pointer
2117 code_start = cfs->get_u1_buffer();
2118 assert(code_start != NULL, "null code start");
2119 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2120 cfs->skip_u1_fast(code_length);
2121
2122 // Exception handler table
2123 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2124 exception_table_length = cfs->get_u2_fast();
2125 if (exception_table_length > 0) {
2126 exception_table_start =
2127 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2128 }
2129
2130 // Parse additional attributes in code attribute
2131 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2132 u2 code_attributes_count = cfs->get_u2_fast();
2133
2134 unsigned int calculated_attribute_length = 0;
2135
2136 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2137 calculated_attribute_length =
2138 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2139 } else {
2140 // max_stack, locals and length are smaller in pre-version 45.2 classes
2141 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2142 }
2143 calculated_attribute_length +=
2144 code_length +
2145 sizeof(exception_table_length) +
2146 sizeof(code_attributes_count) +
2147 exception_table_length *
2148 ( sizeof(u2) + // start_pc
2149 sizeof(u2) + // end_pc
2150 sizeof(u2) + // handler_pc
2151 sizeof(u2) ); // catch_type_index
2152
2153 while (code_attributes_count--) {
2154 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2155 u2 code_attribute_name_index = cfs->get_u2_fast();
2156 u4 code_attribute_length = cfs->get_u4_fast();
2157 calculated_attribute_length += code_attribute_length +
2158 sizeof(code_attribute_name_index) +
2159 sizeof(code_attribute_length);
2160 check_property(valid_symbol_at(code_attribute_name_index),
2161 "Invalid code attribute name index %u in class file %s",
2162 code_attribute_name_index,
2163 CHECK_(nullHandle));
2164 if (LoadLineNumberTables &&
2165 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2166 // Parse and compress line number table
2167 parse_linenumber_table(code_attribute_length, code_length,
2168 &linenumber_table, CHECK_(nullHandle));
2169
2170 } else if (LoadLocalVariableTables &&
2171 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2172 // Parse local variable table
2173 if (!lvt_allocated) {
2174 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2175 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2176 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2177 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2178 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2179 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2180 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2181 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2182 lvt_allocated = true;
2183 }
2184 if (lvt_cnt == max_lvt_cnt) {
2185 max_lvt_cnt <<= 1;
2186 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2187 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2188 }
2189 localvariable_table_start[lvt_cnt] =
2190 parse_localvariable_table(code_length,
2191 max_locals,
2192 code_attribute_length,
2193 &localvariable_table_length[lvt_cnt],
2194 false, // is not LVTT
2195 CHECK_(nullHandle));
2196 total_lvt_length += localvariable_table_length[lvt_cnt];
2197 lvt_cnt++;
2198 } else if (LoadLocalVariableTypeTables &&
2199 _major_version >= JAVA_1_5_VERSION &&
2200 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2201 if (!lvt_allocated) {
2202 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2203 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2204 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2205 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2206 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2207 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2208 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2209 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2210 lvt_allocated = true;
2211 }
2212 // Parse local variable type table
2213 if (lvtt_cnt == max_lvtt_cnt) {
2214 max_lvtt_cnt <<= 1;
2215 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2216 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2217 }
2218 localvariable_type_table_start[lvtt_cnt] =
2219 parse_localvariable_table(code_length,
2220 max_locals,
2221 code_attribute_length,
2222 &localvariable_type_table_length[lvtt_cnt],
2223 true, // is LVTT
2224 CHECK_(nullHandle));
2225 lvtt_cnt++;
2226 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2227 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2228 // Stack map is only needed by the new verifier in JDK1.5.
2229 if (parsed_stackmap_attribute) {
2230 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2231 }
2232 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2233 stackmap_data_length = code_attribute_length;
2234 parsed_stackmap_attribute = true;
2235 } else {
2236 // Skip unknown attributes
2237 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2238 }
2239 }
2240 // check method attribute length
2241 if (_need_verify) {
2242 guarantee_property(method_attribute_length == calculated_attribute_length,
2243 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2244 }
2245 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2246 // Parse Exceptions attribute
2247 if (parsed_checked_exceptions_attribute) {
2248 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2249 }
2250 parsed_checked_exceptions_attribute = true;
2251 checked_exceptions_start =
2252 parse_checked_exceptions(&checked_exceptions_length,
2253 method_attribute_length,
2254 CHECK_(nullHandle));
2255 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2256 // reject multiple method parameters
2257 if (method_parameters_seen) {
2258 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2259 }
2260 method_parameters_seen = true;
2261 method_parameters_length = cfs->get_u1_fast();
2262 const u2 real_length = (method_parameters_length * 4u) + 1u;
2263 if (method_attribute_length != real_length) {
2264 classfile_parse_error(
2265 "Invalid MethodParameters method attribute length %u in class file",
2266 method_attribute_length, CHECK_(nullHandle));
2267 }
2268 method_parameters_data = cfs->get_u1_buffer();
2269 cfs->skip_u2_fast(method_parameters_length);
2270 cfs->skip_u2_fast(method_parameters_length);
2271 // ignore this attribute if it cannot be reflected
2272 if (!SystemDictionary::Parameter_klass_loaded())
2273 method_parameters_length = -1;
2274 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2275 if (method_attribute_length != 0) {
2276 classfile_parse_error(
2277 "Invalid Synthetic method attribute length %u in class file %s",
2278 method_attribute_length, CHECK_(nullHandle));
2279 }
2280 // Should we check that there hasn't already been a synthetic attribute?
2281 access_flags.set_is_synthetic();
2282 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2283 if (method_attribute_length != 0) {
2284 classfile_parse_error(
2285 "Invalid Deprecated method attribute length %u in class file %s",
2286 method_attribute_length, CHECK_(nullHandle));
2287 }
2288 } else if (_major_version >= JAVA_1_5_VERSION) {
2289 if (method_attribute_name == vmSymbols::tag_signature()) {
2290 if (method_attribute_length != 2) {
2291 classfile_parse_error(
2292 "Invalid Signature attribute length %u in class file %s",
2293 method_attribute_length, CHECK_(nullHandle));
2294 }
2295 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2296 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2297 if (runtime_visible_annotations != NULL) {
2298 classfile_parse_error(
2299 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2300 }
2301 runtime_visible_annotations_length = method_attribute_length;
2302 runtime_visible_annotations = cfs->get_u1_buffer();
2303 assert(runtime_visible_annotations != NULL, "null visible annotations");
2304 parse_annotations(runtime_visible_annotations,
2305 runtime_visible_annotations_length, &parsed_annotations);
2306 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2307 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2308 if (runtime_invisible_annotations_exists) {
2309 classfile_parse_error(
2310 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2311 }
2312 runtime_invisible_annotations_exists = true;
2313 if (PreserveAllAnnotations) {
2314 runtime_invisible_annotations_length = method_attribute_length;
2315 runtime_invisible_annotations = cfs->get_u1_buffer();
2316 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2317 }
2318 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2319 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2320 if (runtime_visible_parameter_annotations != NULL) {
2321 classfile_parse_error(
2322 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2323 }
2324 runtime_visible_parameter_annotations_length = method_attribute_length;
2325 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2326 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2327 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2328 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2329 if (runtime_invisible_parameter_annotations_exists) {
2330 classfile_parse_error(
2331 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2332 }
2333 runtime_invisible_parameter_annotations_exists = true;
2334 if (PreserveAllAnnotations) {
2335 runtime_invisible_parameter_annotations_length = method_attribute_length;
2336 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2337 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2338 }
2339 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2340 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2341 if (annotation_default != NULL) {
2342 classfile_parse_error(
2343 "Multiple AnnotationDefault attributes for method in class file %s",
2344 CHECK_(nullHandle));
2345 }
2346 annotation_default_length = method_attribute_length;
2347 annotation_default = cfs->get_u1_buffer();
2348 assert(annotation_default != NULL, "null annotation default");
2349 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2350 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2351 if (runtime_visible_type_annotations != NULL) {
2352 classfile_parse_error(
2353 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2354 CHECK_(nullHandle));
2355 }
2356 runtime_visible_type_annotations_length = method_attribute_length;
2357 runtime_visible_type_annotations = cfs->get_u1_buffer();
2358 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2359 // No need for the VM to parse Type annotations
2360 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2361 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2362 if (runtime_invisible_type_annotations_exists) {
2363 classfile_parse_error(
2364 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2365 CHECK_(nullHandle));
2366 } else {
2367 runtime_invisible_type_annotations_exists = true;
2368 }
2369 if (PreserveAllAnnotations) {
2370 runtime_invisible_type_annotations_length = method_attribute_length;
2371 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2372 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2373 }
2374 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2375 } else {
2376 // Skip unknown attributes
2377 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2378 }
2379 } else {
2380 // Skip unknown attributes
2381 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2382 }
2383 }
2384
2385 if (linenumber_table != NULL) {
2386 linenumber_table->write_terminator();
2387 linenumber_table_length = linenumber_table->position();
2388 }
2389
2390 // Make sure there's at least one Code attribute in non-native/non-abstract method
2391 if (_need_verify) {
2392 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2393 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2394 }
2395
2396 // All sizing information for a Method* is finally available, now create it
2397 InlineTableSizes sizes(
2398 total_lvt_length,
2399 linenumber_table_length,
2400 exception_table_length,
2401 checked_exceptions_length,
2402 method_parameters_length,
2403 generic_signature_index,
2404 runtime_visible_annotations_length +
2405 runtime_invisible_annotations_length,
2406 runtime_visible_parameter_annotations_length +
2407 runtime_invisible_parameter_annotations_length,
2408 runtime_visible_type_annotations_length +
2409 runtime_invisible_type_annotations_length,
2410 annotation_default_length,
2411 0);
2412
2413 Method* m = Method::allocate(
2414 _loader_data, code_length, access_flags, &sizes,
2415 ConstMethod::NORMAL, CHECK_(nullHandle));
2416
2417 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2418
2419 // Fill in information from fixed part (access_flags already set)
2420 m->set_constants(_cp);
2421 m->set_name_index(name_index);
2422 m->set_signature_index(signature_index);
2423 #ifdef CC_INTERP
2424 // hmm is there a gc issue here??
2425 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2426 m->set_result_index(rtf.type());
2427 #endif
2428
2429 if (args_size >= 0) {
2430 m->set_size_of_parameters(args_size);
2431 } else {
2432 m->compute_size_of_parameters(THREAD);
2433 }
2434 #ifdef ASSERT
2435 if (args_size >= 0) {
2436 m->compute_size_of_parameters(THREAD);
2437 assert(args_size == m->size_of_parameters(), "");
2438 }
2439 #endif
2440
2441 // Fill in code attribute information
2442 m->set_max_stack(max_stack);
2443 m->set_max_locals(max_locals);
2444 if (stackmap_data != NULL) {
2445 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2446 stackmap_data_length, CHECK_NULL);
2447 }
2448
2449 // Copy byte codes
2450 m->set_code(code_start);
2451
2452 // Copy line number table
2453 if (linenumber_table != NULL) {
2454 memcpy(m->compressed_linenumber_table(),
2455 linenumber_table->buffer(), linenumber_table_length);
2456 }
2457
2458 // Copy exception table
2459 if (exception_table_length > 0) {
2460 int size =
2461 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2462 copy_u2_with_conversion((u2*) m->exception_table_start(),
2463 exception_table_start, size);
2464 }
2465
2466 // Copy method parameters
2467 if (method_parameters_length > 0) {
2468 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2469 for (int i = 0; i < method_parameters_length; i++) {
2470 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2471 method_parameters_data += 2;
2472 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2473 method_parameters_data += 2;
2474 }
2475 }
2476
2477 // Copy checked exceptions
2478 if (checked_exceptions_length > 0) {
2479 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2480 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2481 }
2482
2483 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2484 if (total_lvt_length > 0) {
2485 promoted_flags->set_has_localvariable_table();
2486 copy_localvariable_table(m->constMethod(), lvt_cnt,
2487 localvariable_table_length,
2488 localvariable_table_start,
2489 lvtt_cnt,
2490 localvariable_type_table_length,
2491 localvariable_type_table_start, CHECK_NULL);
2492 }
2493
2494 if (parsed_annotations.has_any_annotations())
2495 parsed_annotations.apply_to(m);
2496
2497 // Copy annotations
2498 copy_method_annotations(m->constMethod(),
2499 runtime_visible_annotations,
2500 runtime_visible_annotations_length,
2501 runtime_invisible_annotations,
2502 runtime_invisible_annotations_length,
2503 runtime_visible_parameter_annotations,
2504 runtime_visible_parameter_annotations_length,
2505 runtime_invisible_parameter_annotations,
2506 runtime_invisible_parameter_annotations_length,
2507 runtime_visible_type_annotations,
2508 runtime_visible_type_annotations_length,
2509 runtime_invisible_type_annotations,
2510 runtime_invisible_type_annotations_length,
2511 annotation_default,
2512 annotation_default_length,
2513 CHECK_NULL);
2514
2515 if (name == vmSymbols::finalize_method_name() &&
2516 signature == vmSymbols::void_method_signature()) {
2517 if (m->is_empty_method()) {
2518 _has_empty_finalizer = true;
2519 } else {
2520 _has_finalizer = true;
2521 }
2522 }
2523 if (name == vmSymbols::object_initializer_name() &&
2524 signature == vmSymbols::void_method_signature() &&
2525 m->is_vanilla_constructor()) {
2526 _has_vanilla_constructor = true;
2527 }
2528
2529 NOT_PRODUCT(m->verify());
2530 return m;
2531 }
2532
2533
2534 // The promoted_flags parameter is used to pass relevant access_flags
2535 // from the methods back up to the containing klass. These flag values
2536 // are added to klass's access_flags.
2537
2538 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2539 AccessFlags* promoted_flags,
2540 bool* has_final_method,
2541 bool* declares_default_methods,
2542 TRAPS) {
2543 ClassFileStream* cfs = stream();
2544 cfs->guarantee_more(2, CHECK_NULL); // length
2545 u2 length = cfs->get_u2_fast();
2546 if (length == 0) {
2547 _methods = Universe::the_empty_method_array();
2548 } else {
2549 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2550
2551 HandleMark hm(THREAD);
2552 for (int index = 0; index < length; index++) {
2553 methodHandle method = parse_method(is_interface,
2554 promoted_flags,
2555 CHECK_NULL);
2556
2557 if (method->is_final()) {
2558 *has_final_method = true;
2559 }
2560 // declares_default_methods: declares concrete instance methods, any access flags
2561 // used for interface initialization, and default method inheritance analysis
2562 if (is_interface && !(*declares_default_methods)
2563 && !method->is_abstract() && !method->is_static()) {
2564 *declares_default_methods = true;
2565 }
2566 _methods->at_put(index, method());
2567 }
2568
2569 if (_need_verify && length > 1) {
2570 // Check duplicated methods
2571 ResourceMark rm(THREAD);
2572 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2573 THREAD, NameSigHash*, HASH_ROW_SIZE);
2574 initialize_hashtable(names_and_sigs);
2575 bool dup = false;
2576 {
2577 debug_only(No_Safepoint_Verifier nsv;)
2578 for (int i = 0; i < length; i++) {
2579 Method* m = _methods->at(i);
2580 // If no duplicates, add name/signature in hashtable names_and_sigs.
2581 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2582 dup = true;
2583 break;
2584 }
2585 }
2586 }
2587 if (dup) {
2588 classfile_parse_error("Duplicate method name&signature in class file %s",
2589 CHECK_NULL);
2590 }
2591 }
2592 }
2593 return _methods;
2594 }
2595
2596
2597 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2598 int length = methods->length();
2599 // If JVMTI original method ordering or sharing is enabled we have to
2600 // remember the original class file ordering.
2601 // We temporarily use the vtable_index field in the Method* to store the
2602 // class file index, so we can read in after calling qsort.
2603 // Put the method ordering in the shared archive.
2604 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2605 for (int index = 0; index < length; index++) {
2606 Method* m = methods->at(index);
2607 assert(!m->valid_vtable_index(), "vtable index should not be set");
2608 m->set_vtable_index(index);
2609 }
2610 }
2611 // Sort method array by ascending method name (for faster lookups & vtable construction)
2612 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2613 Method::sort_methods(methods);
2614
2615 intArray* method_ordering = NULL;
2616 // If JVMTI original method ordering or sharing is enabled construct int
2617 // array remembering the original ordering
2618 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2619 method_ordering = new intArray(length);
2620 for (int index = 0; index < length; index++) {
2621 Method* m = methods->at(index);
2622 int old_index = m->vtable_index();
2623 assert(old_index >= 0 && old_index < length, "invalid method index");
2624 method_ordering->at_put(index, old_index);
2625 m->set_vtable_index(Method::invalid_vtable_index);
2626 }
2627 }
2628 return method_ordering;
2629 }
2630
2631 // Parse generic_signature attribute for methods and fields
2632 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2633 ClassFileStream* cfs = stream();
2634 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2635 u2 generic_signature_index = cfs->get_u2_fast();
2636 check_property(
2637 valid_symbol_at(generic_signature_index),
2638 "Invalid Signature attribute at constant pool index %u in class file %s",
2639 generic_signature_index, CHECK_0);
2640 return generic_signature_index;
2641 }
2642
2643 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2644 ClassFileStream* cfs = stream();
2645 cfs->guarantee_more(2, CHECK); // sourcefile_index
2646 u2 sourcefile_index = cfs->get_u2_fast();
2647 check_property(
2648 valid_symbol_at(sourcefile_index),
2649 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2650 sourcefile_index, CHECK);
2651 set_class_sourcefile_index(sourcefile_index);
2652 }
2653
2654
2655
2656 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2657 ClassFileStream* cfs = stream();
2658 u1* sde_buffer = cfs->get_u1_buffer();
2659 assert(sde_buffer != NULL, "null sde buffer");
2660
2661 // Don't bother storing it if there is no way to retrieve it
2662 if (JvmtiExport::can_get_source_debug_extension()) {
2663 assert((length+1) > length, "Overflow checking");
2664 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2665 for (int i = 0; i < length; i++) {
2666 sde[i] = sde_buffer[i];
2667 }
2668 sde[length] = '\0';
2669 set_class_sde_buffer((char*)sde, length);
2670 }
2671 // Got utf8 string, set stream position forward
2672 cfs->skip_u1(length, CHECK);
2673 }
2674
2675
2676 // Inner classes can be static, private or protected (classic VM does this)
2677 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2678
2679 // Return number of classes in the inner classes attribute table
2680 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2681 bool parsed_enclosingmethod_attribute,
2682 u2 enclosing_method_class_index,
2683 u2 enclosing_method_method_index,
2684 TRAPS) {
2685 ClassFileStream* cfs = stream();
2686 u1* current_mark = cfs->current();
2687 u2 length = 0;
2688 if (inner_classes_attribute_start != NULL) {
2689 cfs->set_current(inner_classes_attribute_start);
2690 cfs->guarantee_more(2, CHECK_0); // length
2691 length = cfs->get_u2_fast();
2692 }
2693
2694 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2695 // method data:
2696 // [inner_class_info_index,
2697 // outer_class_info_index,
2698 // inner_name_index,
2699 // inner_class_access_flags,
2700 // ...
2701 // enclosing_method_class_index,
2702 // enclosing_method_method_index]
2703 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2704 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2705 _inner_classes = inner_classes;
2706
2707 int index = 0;
2708 int cp_size = _cp->length();
2709 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2710 for (int n = 0; n < length; n++) {
2711 // Inner class index
2712 u2 inner_class_info_index = cfs->get_u2_fast();
2713 check_property(
2714 valid_klass_reference_at(inner_class_info_index),
2715 "inner_class_info_index %u has bad constant type in class file %s",
2716 inner_class_info_index, CHECK_0);
2717 // Outer class index
2718 u2 outer_class_info_index = cfs->get_u2_fast();
2719 check_property(
2720 outer_class_info_index == 0 ||
2721 valid_klass_reference_at(outer_class_info_index),
2722 "outer_class_info_index %u has bad constant type in class file %s",
2723 outer_class_info_index, CHECK_0);
2724 // Inner class name
2725 u2 inner_name_index = cfs->get_u2_fast();
2726 check_property(
2727 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2728 "inner_name_index %u has bad constant type in class file %s",
2729 inner_name_index, CHECK_0);
2730 if (_need_verify) {
2731 guarantee_property(inner_class_info_index != outer_class_info_index,
2732 "Class is both outer and inner class in class file %s", CHECK_0);
2733 }
2734 // Access flags
2735 AccessFlags inner_access_flags;
2736 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2737 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2738 // Set abstract bit for old class files for backward compatibility
2739 flags |= JVM_ACC_ABSTRACT;
2740 }
2741 verify_legal_class_modifiers(flags, CHECK_0);
2742 inner_access_flags.set_flags(flags);
2743
2744 inner_classes->at_put(index++, inner_class_info_index);
2745 inner_classes->at_put(index++, outer_class_info_index);
2746 inner_classes->at_put(index++, inner_name_index);
2747 inner_classes->at_put(index++, inner_access_flags.as_short());
2748 }
2749
2750 // 4347400: make sure there's no duplicate entry in the classes array
2751 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2752 for(int i = 0; i < length * 4; i += 4) {
2753 for(int j = i + 4; j < length * 4; j += 4) {
2754 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2755 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2756 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2757 inner_classes->at(i+3) != inner_classes->at(j+3)),
2758 "Duplicate entry in InnerClasses in class file %s",
2759 CHECK_0);
2760 }
2761 }
2762 }
2763
2764 // Set EnclosingMethod class and method indexes.
2765 if (parsed_enclosingmethod_attribute) {
2766 inner_classes->at_put(index++, enclosing_method_class_index);
2767 inner_classes->at_put(index++, enclosing_method_method_index);
2768 }
2769 assert(index == size, "wrong size");
2770
2771 // Restore buffer's current position.
2772 cfs->set_current(current_mark);
2773
2774 return length;
2775 }
2776
2777 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2778 set_class_synthetic_flag(true);
2779 }
2780
2781 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2782 ClassFileStream* cfs = stream();
2783 u2 signature_index = cfs->get_u2(CHECK);
2784 check_property(
2785 valid_symbol_at(signature_index),
2786 "Invalid constant pool index %u in Signature attribute in class file %s",
2787 signature_index, CHECK);
2788 set_class_generic_signature_index(signature_index);
2789 }
2790
2791 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2792 ClassFileStream* cfs = stream();
2793 u1* current_start = cfs->current();
2794
2795 guarantee_property(attribute_byte_length >= sizeof(u2),
2796 "Invalid BootstrapMethods attribute length %u in class file %s",
2797 attribute_byte_length,
2798 CHECK);
2799
2800 cfs->guarantee_more(attribute_byte_length, CHECK);
2801
2802 int attribute_array_length = cfs->get_u2_fast();
2803
2804 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2805 "Short length on BootstrapMethods in class file %s",
2806 CHECK);
2807
2808
2809 // The attribute contains a counted array of counted tuples of shorts,
2810 // represending bootstrap specifiers:
2811 // length*{bootstrap_method_index, argument_count*{argument_index}}
2812 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2813 // operand_count = number of shorts in attr, except for leading length
2814
2815 // The attribute is copied into a short[] array.
2816 // The array begins with a series of short[2] pairs, one for each tuple.
2817 int index_size = (attribute_array_length * 2);
2818
2819 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2820
2821 // Eagerly assign operands so they will be deallocated with the constant
2822 // pool if there is an error.
2823 _cp->set_operands(operands);
2824
2825 int operand_fill_index = index_size;
2826 int cp_size = _cp->length();
2827
2828 for (int n = 0; n < attribute_array_length; n++) {
2829 // Store a 32-bit offset into the header of the operand array.
2830 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2831
2832 // Read a bootstrap specifier.
2833 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2834 u2 bootstrap_method_index = cfs->get_u2_fast();
2835 u2 argument_count = cfs->get_u2_fast();
2836 check_property(
2837 valid_cp_range(bootstrap_method_index, cp_size) &&
2838 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2839 "bootstrap_method_index %u has bad constant type in class file %s",
2840 bootstrap_method_index,
2841 CHECK);
2842
2843 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2844 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2845 CHECK);
2846
2847 operands->at_put(operand_fill_index++, bootstrap_method_index);
2848 operands->at_put(operand_fill_index++, argument_count);
2849
2850 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2851 for (int j = 0; j < argument_count; j++) {
2852 u2 argument_index = cfs->get_u2_fast();
2853 check_property(
2854 valid_cp_range(argument_index, cp_size) &&
2855 _cp->tag_at(argument_index).is_loadable_constant(),
2856 "argument_index %u has bad constant type in class file %s",
2857 argument_index,
2858 CHECK);
2859 operands->at_put(operand_fill_index++, argument_index);
2860 }
2861 }
2862
2863 u1* current_end = cfs->current();
2864 guarantee_property(current_end == current_start + attribute_byte_length,
2865 "Bad length on BootstrapMethods in class file %s",
2866 CHECK);
2867 }
2868
2869 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2870 TRAPS) {
2871 ClassFileStream* cfs = stream();
2872 // Set inner classes attribute to default sentinel
2873 _inner_classes = Universe::the_empty_short_array();
2874 cfs->guarantee_more(2, CHECK); // attributes_count
2875 u2 attributes_count = cfs->get_u2_fast();
2876 bool parsed_sourcefile_attribute = false;
2877 bool parsed_innerclasses_attribute = false;
2878 bool parsed_enclosingmethod_attribute = false;
2879 bool parsed_bootstrap_methods_attribute = false;
2880 u1* runtime_visible_annotations = NULL;
2881 int runtime_visible_annotations_length = 0;
2882 u1* runtime_invisible_annotations = NULL;
2883 int runtime_invisible_annotations_length = 0;
2884 u1* runtime_visible_type_annotations = NULL;
2885 int runtime_visible_type_annotations_length = 0;
2886 u1* runtime_invisible_type_annotations = NULL;
2887 int runtime_invisible_type_annotations_length = 0;
2888 bool runtime_invisible_type_annotations_exists = false;
2889 bool runtime_invisible_annotations_exists = false;
2890 bool parsed_source_debug_ext_annotations_exist = false;
2891 u1* inner_classes_attribute_start = NULL;
2892 u4 inner_classes_attribute_length = 0;
2893 u2 enclosing_method_class_index = 0;
2894 u2 enclosing_method_method_index = 0;
2895 // Iterate over attributes
2896 while (attributes_count--) {
2897 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2898 u2 attribute_name_index = cfs->get_u2_fast();
2899 u4 attribute_length = cfs->get_u4_fast();
2900 check_property(
2901 valid_symbol_at(attribute_name_index),
2902 "Attribute name has bad constant pool index %u in class file %s",
2903 attribute_name_index, CHECK);
2904 Symbol* tag = _cp->symbol_at(attribute_name_index);
2905 if (tag == vmSymbols::tag_source_file()) {
2906 // Check for SourceFile tag
2907 if (_need_verify) {
2908 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2909 }
2910 if (parsed_sourcefile_attribute) {
2911 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2912 } else {
2913 parsed_sourcefile_attribute = true;
2914 }
2915 parse_classfile_sourcefile_attribute(CHECK);
2916 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2917 // Check for SourceDebugExtension tag
2918 if (parsed_source_debug_ext_annotations_exist) {
2919 classfile_parse_error(
2920 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2921 }
2922 parsed_source_debug_ext_annotations_exist = true;
2923 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2924 } else if (tag == vmSymbols::tag_inner_classes()) {
2925 // Check for InnerClasses tag
2926 if (parsed_innerclasses_attribute) {
2927 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2928 } else {
2929 parsed_innerclasses_attribute = true;
2930 }
2931 inner_classes_attribute_start = cfs->get_u1_buffer();
2932 inner_classes_attribute_length = attribute_length;
2933 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2934 } else if (tag == vmSymbols::tag_synthetic()) {
2935 // Check for Synthetic tag
2936 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2937 if (attribute_length != 0) {
2938 classfile_parse_error(
2939 "Invalid Synthetic classfile attribute length %u in class file %s",
2940 attribute_length, CHECK);
2941 }
2942 parse_classfile_synthetic_attribute(CHECK);
2943 } else if (tag == vmSymbols::tag_deprecated()) {
2944 // Check for Deprecatd tag - 4276120
2945 if (attribute_length != 0) {
2946 classfile_parse_error(
2947 "Invalid Deprecated classfile attribute length %u in class file %s",
2948 attribute_length, CHECK);
2949 }
2950 } else if (_major_version >= JAVA_1_5_VERSION) {
2951 if (tag == vmSymbols::tag_signature()) {
2952 if (attribute_length != 2) {
2953 classfile_parse_error(
2954 "Wrong Signature attribute length %u in class file %s",
2955 attribute_length, CHECK);
2956 }
2957 parse_classfile_signature_attribute(CHECK);
2958 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2959 if (runtime_visible_annotations != NULL) {
2960 classfile_parse_error(
2961 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2962 }
2963 runtime_visible_annotations_length = attribute_length;
2964 runtime_visible_annotations = cfs->get_u1_buffer();
2965 assert(runtime_visible_annotations != NULL, "null visible annotations");
2966 parse_annotations(runtime_visible_annotations,
2967 runtime_visible_annotations_length,
2968 parsed_annotations);
2969 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2970 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2971 if (runtime_invisible_annotations_exists) {
2972 classfile_parse_error(
2973 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2974 }
2975 runtime_invisible_annotations_exists = true;
2976 if (PreserveAllAnnotations) {
2977 runtime_invisible_annotations_length = attribute_length;
2978 runtime_invisible_annotations = cfs->get_u1_buffer();
2979 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2980 }
2981 cfs->skip_u1(attribute_length, CHECK);
2982 } else if (tag == vmSymbols::tag_enclosing_method()) {
2983 if (parsed_enclosingmethod_attribute) {
2984 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2985 } else {
2986 parsed_enclosingmethod_attribute = true;
2987 }
2988 guarantee_property(attribute_length == 4,
2989 "Wrong EnclosingMethod attribute length %u in class file %s",
2990 attribute_length, CHECK);
2991 cfs->guarantee_more(4, CHECK); // class_index, method_index
2992 enclosing_method_class_index = cfs->get_u2_fast();
2993 enclosing_method_method_index = cfs->get_u2_fast();
2994 if (enclosing_method_class_index == 0) {
2995 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2996 }
2997 // Validate the constant pool indices and types
2998 check_property(valid_klass_reference_at(enclosing_method_class_index),
2999 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3000 if (enclosing_method_method_index != 0 &&
3001 (!_cp->is_within_bounds(enclosing_method_method_index) ||
3002 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3003 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3004 }
3005 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3006 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3007 if (parsed_bootstrap_methods_attribute)
3008 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3009 parsed_bootstrap_methods_attribute = true;
3010 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3011 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3012 if (runtime_visible_type_annotations != NULL) {
3013 classfile_parse_error(
3014 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3015 }
3016 runtime_visible_type_annotations_length = attribute_length;
3017 runtime_visible_type_annotations = cfs->get_u1_buffer();
3018 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3019 // No need for the VM to parse Type annotations
3020 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3021 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3022 if (runtime_invisible_type_annotations_exists) {
3023 classfile_parse_error(
3024 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3025 } else {
3026 runtime_invisible_type_annotations_exists = true;
3027 }
3028 if (PreserveAllAnnotations) {
3029 runtime_invisible_type_annotations_length = attribute_length;
3030 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3031 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3032 }
3033 cfs->skip_u1(attribute_length, CHECK);
3034 } else {
3035 // Unknown attribute
3036 cfs->skip_u1(attribute_length, CHECK);
3037 }
3038 } else {
3039 // Unknown attribute
3040 cfs->skip_u1(attribute_length, CHECK);
3041 }
3042 }
3043 _annotations = assemble_annotations(runtime_visible_annotations,
3044 runtime_visible_annotations_length,
3045 runtime_invisible_annotations,
3046 runtime_invisible_annotations_length,
3047 CHECK);
3048 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3049 runtime_visible_type_annotations_length,
3050 runtime_invisible_type_annotations,
3051 runtime_invisible_type_annotations_length,
3052 CHECK);
3053
3054 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3055 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3056 inner_classes_attribute_start,
3057 parsed_innerclasses_attribute,
3058 enclosing_method_class_index,
3059 enclosing_method_method_index,
3060 CHECK);
3061 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3062 guarantee_property(
3063 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3064 "Wrong InnerClasses attribute length in class file %s", CHECK);
3065 }
3066 }
3067
3068 if (_max_bootstrap_specifier_index >= 0) {
3069 guarantee_property(parsed_bootstrap_methods_attribute,
3070 "Missing BootstrapMethods attribute in class file %s", CHECK);
3071 }
3072 }
3073
3074 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3075 if (_synthetic_flag)
3076 k->set_is_synthetic();
3077 if (_sourcefile_index != 0) {
3078 k->set_source_file_name_index(_sourcefile_index);
3079 }
3080 if (_generic_signature_index != 0) {
3081 k->set_generic_signature_index(_generic_signature_index);
3082 }
3083 if (_sde_buffer != NULL) {
3084 k->set_source_debug_extension(_sde_buffer, _sde_length);
3085 }
3086 }
3087
3088 // Create the Annotations object that will
3089 // hold the annotations array for the Klass.
3090 void ClassFileParser::create_combined_annotations(TRAPS) {
3091 if (_annotations == NULL &&
3092 _type_annotations == NULL &&
3093 _fields_annotations == NULL &&
3094 _fields_type_annotations == NULL) {
3095 // Don't create the Annotations object unnecessarily.
3096 return;
3097 }
3098
3099 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3100 annotations->set_class_annotations(_annotations);
3101 annotations->set_class_type_annotations(_type_annotations);
3102 annotations->set_fields_annotations(_fields_annotations);
3103 annotations->set_fields_type_annotations(_fields_type_annotations);
3104
3105 // This is the Annotations object that will be
3106 // assigned to InstanceKlass being constructed.
3107 _combined_annotations = annotations;
3108
3109 // The annotations arrays below has been transfered the
3110 // _combined_annotations so these fields can now be cleared.
3111 _annotations = NULL;
3112 _type_annotations = NULL;
3113 _fields_annotations = NULL;
3114 _fields_type_annotations = NULL;
3115 }
3116
3117 // Transfer ownership of metadata allocated to the InstanceKlass.
3118 void ClassFileParser::apply_parsed_class_metadata(
3119 instanceKlassHandle this_klass,
3120 int java_fields_count, TRAPS) {
3121 _cp->set_pool_holder(this_klass());
3122 this_klass->set_constants(_cp);
3123 this_klass->set_fields(_fields, java_fields_count);
3124 this_klass->set_methods(_methods);
3125 this_klass->set_inner_classes(_inner_classes);
3126 this_klass->set_local_interfaces(_local_interfaces);
3127 this_klass->set_transitive_interfaces(_transitive_interfaces);
3128 this_klass->set_annotations(_combined_annotations);
3129
3130 // Clear out these fields so they don't get deallocated by the destructor
3131 clear_class_metadata();
3132 }
3133
3134 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3135 int runtime_visible_annotations_length,
3136 u1* runtime_invisible_annotations,
3137 int runtime_invisible_annotations_length, TRAPS) {
3138 AnnotationArray* annotations = NULL;
3139 if (runtime_visible_annotations != NULL ||
3140 runtime_invisible_annotations != NULL) {
3141 annotations = MetadataFactory::new_array<u1>(_loader_data,
3142 runtime_visible_annotations_length +
3143 runtime_invisible_annotations_length,
3144 CHECK_(annotations));
3145 if (runtime_visible_annotations != NULL) {
3146 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3147 annotations->at_put(i, runtime_visible_annotations[i]);
3148 }
3149 }
3150 if (runtime_invisible_annotations != NULL) {
3151 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3152 int append = runtime_visible_annotations_length+i;
3153 annotations->at_put(append, runtime_invisible_annotations[i]);
3154 }
3155 }
3156 }
3157 return annotations;
3158 }
3159
3160 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3161 TRAPS) {
3162 instanceKlassHandle super_klass;
3163 if (super_class_index == 0) {
3164 check_property(_class_name == vmSymbols::java_lang_Object(),
3165 "Invalid superclass index %u in class file %s",
3166 super_class_index,
3167 CHECK_NULL);
3168 } else {
3169 check_property(valid_klass_reference_at(super_class_index),
3170 "Invalid superclass index %u in class file %s",
3171 super_class_index,
3172 CHECK_NULL);
3173 // The class name should be legal because it is checked when parsing constant pool.
3174 // However, make sure it is not an array type.
3175 bool is_array = false;
3176 if (_cp->tag_at(super_class_index).is_klass()) {
3177 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3178 if (_need_verify)
3179 is_array = super_klass->oop_is_array();
3180 } else if (_need_verify) {
3181 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3182 }
3183 if (_need_verify) {
3184 guarantee_property(!is_array,
3185 "Bad superclass name in class file %s", CHECK_NULL);
3186 }
3187 }
3188 return super_klass;
3189 }
3190
3191
3192 // Values needed for oopmap and InstanceKlass creation
3193 class FieldLayoutInfo : public StackObj {
3194 public:
3195 int* nonstatic_oop_offsets;
3196 unsigned int* nonstatic_oop_counts;
3197 unsigned int nonstatic_oop_map_count;
3198 unsigned int total_oop_map_count;
3199 int instance_size;
3200 int nonstatic_field_size;
3201 int static_field_size;
3202 bool has_nonstatic_fields;
3203 };
3204
3205 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3206 void ClassFileParser::layout_fields(Handle class_loader,
3207 FieldAllocationCount* fac,
3208 ClassAnnotationCollector* parsed_annotations,
3209 FieldLayoutInfo* info,
3210 TRAPS) {
3211
3212 // Field size and offset computation
3213 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3214 int next_static_oop_offset;
3215 int next_static_double_offset;
3216 int next_static_word_offset;
3217 int next_static_short_offset;
3218 int next_static_byte_offset;
3219 int next_nonstatic_oop_offset;
3220 int next_nonstatic_double_offset;
3221 int next_nonstatic_word_offset;
3222 int next_nonstatic_short_offset;
3223 int next_nonstatic_byte_offset;
3224 int first_nonstatic_oop_offset;
3225 int next_nonstatic_field_offset;
3226 int next_nonstatic_padded_offset;
3227
3228 // Count the contended fields by type.
3229 //
3230 // We ignore static fields, because @Contended is not supported for them.
3231 // The layout code below will also ignore the static fields.
3232 int nonstatic_contended_count = 0;
3233 FieldAllocationCount fac_contended;
3234 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3235 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3236 if (fs.is_contended()) {
3237 fac_contended.count[atype]++;
3238 if (!fs.access_flags().is_static()) {
3239 nonstatic_contended_count++;
3240 }
3241 }
3242 }
3243
3244
3245 // Calculate the starting byte offsets
3246 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3247 next_static_double_offset = next_static_oop_offset +
3248 ((fac->count[STATIC_OOP]) * heapOopSize);
3249 if ( fac->count[STATIC_DOUBLE] &&
3250 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3251 Universe::field_type_should_be_aligned(T_LONG)) ) {
3252 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3253 }
3254
3255 next_static_word_offset = next_static_double_offset +
3256 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3257 next_static_short_offset = next_static_word_offset +
3258 ((fac->count[STATIC_WORD]) * BytesPerInt);
3259 next_static_byte_offset = next_static_short_offset +
3260 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3261
3262 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3263 nonstatic_field_size * heapOopSize;
3264
3265 next_nonstatic_field_offset = nonstatic_fields_start;
3266
3267 bool is_contended_class = parsed_annotations->is_contended();
3268
3269 // Class is contended, pad before all the fields
3270 if (is_contended_class) {
3271 next_nonstatic_field_offset += ContendedPaddingWidth;
3272 }
3273
3274 // Compute the non-contended fields count.
3275 // The packing code below relies on these counts to determine if some field
3276 // can be squeezed into the alignment gap. Contended fields are obviously
3277 // exempt from that.
3278 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3279 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3280 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3281 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3282 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3283
3284 // Total non-static fields count, including every contended field
3285 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3286 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3287 fac->count[NONSTATIC_OOP];
3288
3289 bool super_has_nonstatic_fields =
3290 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3291 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3292
3293
3294 // Prepare list of oops for oop map generation.
3295 //
3296 // "offset" and "count" lists are describing the set of contiguous oop
3297 // regions. offset[i] is the start of the i-th region, which then has
3298 // count[i] oops following. Before we know how many regions are required,
3299 // we pessimistically allocate the maps to fit all the oops into the
3300 // distinct regions.
3301 //
3302 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3303 // to figure out if we still need to do this.
3304 int* nonstatic_oop_offsets;
3305 unsigned int* nonstatic_oop_counts;
3306 unsigned int nonstatic_oop_map_count = 0;
3307 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3308
3309 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3310 THREAD, int, max_nonstatic_oop_maps);
3311 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3312 THREAD, unsigned int, max_nonstatic_oop_maps);
3313
3314 first_nonstatic_oop_offset = 0; // will be set for first oop field
3315
3316 bool compact_fields = CompactFields;
3317 int allocation_style = FieldsAllocationStyle;
3318 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3319 assert(false, "0 <= FieldsAllocationStyle <= 2");
3320 allocation_style = 1; // Optimistic
3321 }
3322
3323 // The next classes have predefined hard-coded fields offsets
3324 // (see in JavaClasses::compute_hard_coded_offsets()).
3325 // Use default fields allocation order for them.
3326 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3327 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3328 _class_name == vmSymbols::java_lang_Class() ||
3329 _class_name == vmSymbols::java_lang_ClassLoader() ||
3330 _class_name == vmSymbols::java_lang_ref_Reference() ||
3331 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3332 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3333 _class_name == vmSymbols::java_lang_String() ||
3334 _class_name == vmSymbols::java_lang_Throwable() ||
3335 _class_name == vmSymbols::java_lang_Boolean() ||
3336 _class_name == vmSymbols::java_lang_Character() ||
3337 _class_name == vmSymbols::java_lang_Float() ||
3338 _class_name == vmSymbols::java_lang_Double() ||
3339 _class_name == vmSymbols::java_lang_Byte() ||
3340 _class_name == vmSymbols::java_lang_Short() ||
3341 _class_name == vmSymbols::java_lang_Integer() ||
3342 _class_name == vmSymbols::java_lang_Long())) {
3343 allocation_style = 0; // Allocate oops first
3344 compact_fields = false; // Don't compact fields
3345 }
3346
3347 // Rearrange fields for a given allocation style
3348 if( allocation_style == 0 ) {
3349 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3350 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3351 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3352 (nonstatic_oop_count * heapOopSize);
3353 } else if( allocation_style == 1 ) {
3354 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3355 next_nonstatic_double_offset = next_nonstatic_field_offset;
3356 } else if( allocation_style == 2 ) {
3357 // Fields allocation: oops fields in super and sub classes are together.
3358 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3359 _super_klass->nonstatic_oop_map_size() > 0 ) {
3360 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3361 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3362 OopMapBlock* last_map = first_map + map_count - 1;
3363 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3364 if (next_offset == next_nonstatic_field_offset) {
3365 allocation_style = 0; // allocate oops first
3366 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3367 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3368 (nonstatic_oop_count * heapOopSize);
3369 }
3370 }
3371 if( allocation_style == 2 ) {
3372 allocation_style = 1; // allocate oops last
3373 next_nonstatic_double_offset = next_nonstatic_field_offset;
3374 }
3375 } else {
3376 ShouldNotReachHere();
3377 }
3378
3379 int nonstatic_oop_space_count = 0;
3380 int nonstatic_word_space_count = 0;
3381 int nonstatic_short_space_count = 0;
3382 int nonstatic_byte_space_count = 0;
3383 int nonstatic_oop_space_offset;
3384 int nonstatic_word_space_offset;
3385 int nonstatic_short_space_offset;
3386 int nonstatic_byte_space_offset;
3387
3388 // Try to squeeze some of the fields into the gaps due to
3389 // long/double alignment.
3390 if( nonstatic_double_count > 0 ) {
3391 int offset = next_nonstatic_double_offset;
3392 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3393 if( compact_fields && offset != next_nonstatic_double_offset ) {
3394 // Allocate available fields into the gap before double field.
3395 int length = next_nonstatic_double_offset - offset;
3396 assert(length == BytesPerInt, "");
3397 nonstatic_word_space_offset = offset;
3398 if( nonstatic_word_count > 0 ) {
3399 nonstatic_word_count -= 1;
3400 nonstatic_word_space_count = 1; // Only one will fit
3401 length -= BytesPerInt;
3402 offset += BytesPerInt;
3403 }
3404 nonstatic_short_space_offset = offset;
3405 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3406 nonstatic_short_count -= 1;
3407 nonstatic_short_space_count += 1;
3408 length -= BytesPerShort;
3409 offset += BytesPerShort;
3410 }
3411 nonstatic_byte_space_offset = offset;
3412 while( length > 0 && nonstatic_byte_count > 0 ) {
3413 nonstatic_byte_count -= 1;
3414 nonstatic_byte_space_count += 1;
3415 length -= 1;
3416 }
3417 // Allocate oop field in the gap if there are no other fields for that.
3418 nonstatic_oop_space_offset = offset;
3419 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3420 allocation_style != 0 ) { // when oop fields not first
3421 nonstatic_oop_count -= 1;
3422 nonstatic_oop_space_count = 1; // Only one will fit
3423 length -= heapOopSize;
3424 offset += heapOopSize;
3425 }
3426 }
3427 }
3428
3429 next_nonstatic_word_offset = next_nonstatic_double_offset +
3430 (nonstatic_double_count * BytesPerLong);
3431 next_nonstatic_short_offset = next_nonstatic_word_offset +
3432 (nonstatic_word_count * BytesPerInt);
3433 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3434 (nonstatic_short_count * BytesPerShort);
3435 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3436 nonstatic_byte_count;
3437
3438 // let oops jump before padding with this allocation style
3439 if( allocation_style == 1 ) {
3440 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3441 if( nonstatic_oop_count > 0 ) {
3442 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3443 }
3444 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3445 }
3446
3447 // Iterate over fields again and compute correct offsets.
3448 // The field allocation type was temporarily stored in the offset slot.
3449 // oop fields are located before non-oop fields (static and non-static).
3450 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3451
3452 // skip already laid out fields
3453 if (fs.is_offset_set()) continue;
3454
3455 // contended instance fields are handled below
3456 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3457
3458 int real_offset;
3459 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3460
3461 // pack the rest of the fields
3462 switch (atype) {
3463 case STATIC_OOP:
3464 real_offset = next_static_oop_offset;
3465 next_static_oop_offset += heapOopSize;
3466 break;
3467 case STATIC_BYTE:
3468 real_offset = next_static_byte_offset;
3469 next_static_byte_offset += 1;
3470 break;
3471 case STATIC_SHORT:
3472 real_offset = next_static_short_offset;
3473 next_static_short_offset += BytesPerShort;
3474 break;
3475 case STATIC_WORD:
3476 real_offset = next_static_word_offset;
3477 next_static_word_offset += BytesPerInt;
3478 break;
3479 case STATIC_DOUBLE:
3480 real_offset = next_static_double_offset;
3481 next_static_double_offset += BytesPerLong;
3482 break;
3483 case NONSTATIC_OOP:
3484 if( nonstatic_oop_space_count > 0 ) {
3485 real_offset = nonstatic_oop_space_offset;
3486 nonstatic_oop_space_offset += heapOopSize;
3487 nonstatic_oop_space_count -= 1;
3488 } else {
3489 real_offset = next_nonstatic_oop_offset;
3490 next_nonstatic_oop_offset += heapOopSize;
3491 }
3492
3493 // Record this oop in the oop maps
3494 if( nonstatic_oop_map_count > 0 &&
3495 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3496 real_offset -
3497 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3498 heapOopSize ) {
3499 // This oop is adjacent to the previous one, add to current oop map
3500 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3501 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3502 } else {
3503 // This oop is not adjacent to the previous one, create new oop map
3504 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3505 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3506 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3507 nonstatic_oop_map_count += 1;
3508 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3509 first_nonstatic_oop_offset = real_offset;
3510 }
3511 }
3512 break;
3513 case NONSTATIC_BYTE:
3514 if( nonstatic_byte_space_count > 0 ) {
3515 real_offset = nonstatic_byte_space_offset;
3516 nonstatic_byte_space_offset += 1;
3517 nonstatic_byte_space_count -= 1;
3518 } else {
3519 real_offset = next_nonstatic_byte_offset;
3520 next_nonstatic_byte_offset += 1;
3521 }
3522 break;
3523 case NONSTATIC_SHORT:
3524 if( nonstatic_short_space_count > 0 ) {
3525 real_offset = nonstatic_short_space_offset;
3526 nonstatic_short_space_offset += BytesPerShort;
3527 nonstatic_short_space_count -= 1;
3528 } else {
3529 real_offset = next_nonstatic_short_offset;
3530 next_nonstatic_short_offset += BytesPerShort;
3531 }
3532 break;
3533 case NONSTATIC_WORD:
3534 if( nonstatic_word_space_count > 0 ) {
3535 real_offset = nonstatic_word_space_offset;
3536 nonstatic_word_space_offset += BytesPerInt;
3537 nonstatic_word_space_count -= 1;
3538 } else {
3539 real_offset = next_nonstatic_word_offset;
3540 next_nonstatic_word_offset += BytesPerInt;
3541 }
3542 break;
3543 case NONSTATIC_DOUBLE:
3544 real_offset = next_nonstatic_double_offset;
3545 next_nonstatic_double_offset += BytesPerLong;
3546 break;
3547 default:
3548 ShouldNotReachHere();
3549 }
3550 fs.set_offset(real_offset);
3551 }
3552
3553
3554 // Handle the contended cases.
3555 //
3556 // Each contended field should not intersect the cache line with another contended field.
3557 // In the absence of alignment information, we end up with pessimistically separating
3558 // the fields with full-width padding.
3559 //
3560 // Additionally, this should not break alignment for the fields, so we round the alignment up
3561 // for each field.
3562 if (nonstatic_contended_count > 0) {
3563
3564 // if there is at least one contended field, we need to have pre-padding for them
3565 next_nonstatic_padded_offset += ContendedPaddingWidth;
3566
3567 // collect all contended groups
3568 BitMap bm(_cp->size());
3569 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3570 // skip already laid out fields
3571 if (fs.is_offset_set()) continue;
3572
3573 if (fs.is_contended()) {
3574 bm.set_bit(fs.contended_group());
3575 }
3576 }
3577
3578 int current_group = -1;
3579 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3580
3581 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3582
3583 // skip already laid out fields
3584 if (fs.is_offset_set()) continue;
3585
3586 // skip non-contended fields and fields from different group
3587 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3588
3589 // handle statics below
3590 if (fs.access_flags().is_static()) continue;
3591
3592 int real_offset;
3593 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3594
3595 switch (atype) {
3596 case NONSTATIC_BYTE:
3597 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3598 real_offset = next_nonstatic_padded_offset;
3599 next_nonstatic_padded_offset += 1;
3600 break;
3601
3602 case NONSTATIC_SHORT:
3603 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3604 real_offset = next_nonstatic_padded_offset;
3605 next_nonstatic_padded_offset += BytesPerShort;
3606 break;
3607
3608 case NONSTATIC_WORD:
3609 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3610 real_offset = next_nonstatic_padded_offset;
3611 next_nonstatic_padded_offset += BytesPerInt;
3612 break;
3613
3614 case NONSTATIC_DOUBLE:
3615 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3616 real_offset = next_nonstatic_padded_offset;
3617 next_nonstatic_padded_offset += BytesPerLong;
3618 break;
3619
3620 case NONSTATIC_OOP:
3621 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3622 real_offset = next_nonstatic_padded_offset;
3623 next_nonstatic_padded_offset += heapOopSize;
3624
3625 // Record this oop in the oop maps
3626 if( nonstatic_oop_map_count > 0 &&
3627 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3628 real_offset -
3629 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3630 heapOopSize ) {
3631 // This oop is adjacent to the previous one, add to current oop map
3632 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3633 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3634 } else {
3635 // This oop is not adjacent to the previous one, create new oop map
3636 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3637 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3638 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3639 nonstatic_oop_map_count += 1;
3640 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3641 first_nonstatic_oop_offset = real_offset;
3642 }
3643 }
3644 break;
3645
3646 default:
3647 ShouldNotReachHere();
3648 }
3649
3650 if (fs.contended_group() == 0) {
3651 // Contended group defines the equivalence class over the fields:
3652 // the fields within the same contended group are not inter-padded.
3653 // The only exception is default group, which does not incur the
3654 // equivalence, and so requires intra-padding.
3655 next_nonstatic_padded_offset += ContendedPaddingWidth;
3656 }
3657
3658 fs.set_offset(real_offset);
3659 } // for
3660
3661 // Start laying out the next group.
3662 // Note that this will effectively pad the last group in the back;
3663 // this is expected to alleviate memory contention effects for
3664 // subclass fields and/or adjacent object.
3665 // If this was the default group, the padding is already in place.
3666 if (current_group != 0) {
3667 next_nonstatic_padded_offset += ContendedPaddingWidth;
3668 }
3669 }
3670
3671 // handle static fields
3672 }
3673
3674 // Entire class is contended, pad in the back.
3675 // This helps to alleviate memory contention effects for subclass fields
3676 // and/or adjacent object.
3677 if (is_contended_class) {
3678 next_nonstatic_padded_offset += ContendedPaddingWidth;
3679 }
3680
3681 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3682
3683 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3684 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3685 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3686
3687 int static_field_size = (static_fields_end -
3688 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3689 nonstatic_field_size = nonstatic_field_size +
3690 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3691
3692 int instance_size = align_object_size(instance_end / wordSize);
3693
3694 assert(instance_size == align_object_size(align_size_up(
3695 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3696 wordSize) / wordSize), "consistent layout helper value");
3697
3698 // Invariant: nonstatic_field end/start should only change if there are
3699 // nonstatic fields in the class, or if the class is contended. We compare
3700 // against the non-aligned value, so that end alignment will not fail the
3701 // assert without actually having the fields.
3702 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3703 is_contended_class ||
3704 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3705
3706 // Number of non-static oop map blocks allocated at end of klass.
3707 const unsigned int total_oop_map_count =
3708 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3709 first_nonstatic_oop_offset);
3710
3711 #ifndef PRODUCT
3712 if (PrintFieldLayout) {
3713 print_field_layout(_class_name,
3714 _fields,
3715 _cp,
3716 instance_size,
3717 nonstatic_fields_start,
3718 nonstatic_fields_end,
3719 static_fields_end);
3720 }
3721
3722 #endif
3723 // Pass back information needed for InstanceKlass creation
3724 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3725 info->nonstatic_oop_counts = nonstatic_oop_counts;
3726 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3727 info->total_oop_map_count = total_oop_map_count;
3728 info->instance_size = instance_size;
3729 info->static_field_size = static_field_size;
3730 info->nonstatic_field_size = nonstatic_field_size;
3731 info->has_nonstatic_fields = has_nonstatic_fields;
3732 }
3733
3734
3735 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3736 ClassLoaderData* loader_data,
3737 Handle protection_domain,
3738 KlassHandle host_klass,
3739 GrowableArray<Handle>* cp_patches,
3740 TempNewSymbol& parsed_name,
3741 bool verify,
3742 TRAPS) {
3743
3744 // When a retransformable agent is attached, JVMTI caches the
3745 // class bytes that existed before the first retransformation.
3746 // If RedefineClasses() was used before the retransformable
3747 // agent attached, then the cached class bytes may not be the
3748 // original class bytes.
3749 JvmtiCachedClassFileData *cached_class_file = NULL;
3750 Handle class_loader(THREAD, loader_data->class_loader());
3751 bool has_default_methods = false;
3752 bool declares_default_methods = false;
3753 ResourceMark rm(THREAD);
3754
3755 ClassFileStream* cfs = stream();
3756 // Timing
3757 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3758 JavaThread* jt = (JavaThread*) THREAD;
3759
3760 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3761 ClassLoader::perf_class_parse_selftime(),
3762 NULL,
3763 jt->get_thread_stat()->perf_recursion_counts_addr(),
3764 jt->get_thread_stat()->perf_timers_addr(),
3765 PerfClassTraceTime::PARSE_CLASS);
3766
3767 init_parsed_class_attributes(loader_data);
3768
3769 if (JvmtiExport::should_post_class_file_load_hook()) {
3770 // Get the cached class file bytes (if any) from the class that
3771 // is being redefined or retransformed. We use jvmti_thread_state()
3772 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3773 // a JvmtiThreadState any earlier than necessary. This will help
3774 // avoid the bug described by 7126851.
3775 JvmtiThreadState *state = jt->jvmti_thread_state();
3776 if (state != NULL) {
3777 KlassHandle *h_class_being_redefined =
3778 state->get_class_being_redefined();
3779 if (h_class_being_redefined != NULL) {
3780 instanceKlassHandle ikh_class_being_redefined =
3781 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3782 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3783 }
3784 }
3785
3786 unsigned char* ptr = cfs->buffer();
3787 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3788
3789 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3790 &ptr, &end_ptr, &cached_class_file);
3791
3792 if (ptr != cfs->buffer()) {
3793 // JVMTI agent has modified class file data.
3794 // Set new class file stream using JVMTI agent modified
3795 // class file data.
3796 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3797 set_stream(cfs);
3798 }
3799 }
3800
3801 _host_klass = host_klass;
3802 _cp_patches = cp_patches;
3803
3804 instanceKlassHandle nullHandle;
3805
3806 // Figure out whether we can skip format checking (matching classic VM behavior)
3807 if (DumpSharedSpaces) {
3808 // verify == true means it's a 'remote' class (i.e., non-boot class)
3809 // Verification decision is based on BytecodeVerificationRemote flag
3810 // for those classes.
3811 _need_verify = (verify) ? BytecodeVerificationRemote :
3812 BytecodeVerificationLocal;
3813 } else {
3814 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3815 }
3816
3817 // Set the verify flag in stream
3818 cfs->set_verify(_need_verify);
3819
3820 // Save the class file name for easier error message printing.
3821 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3822
3823 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3824 // Magic value
3825 u4 magic = cfs->get_u4_fast();
3826 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3827 "Incompatible magic value %u in class file %s",
3828 magic, CHECK_(nullHandle));
3829
3830 // Version numbers
3831 u2 minor_version = cfs->get_u2_fast();
3832 u2 major_version = cfs->get_u2_fast();
3833
3834 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3835 ResourceMark rm;
3836 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3837 major_version, minor_version, name->as_C_string());
3838 Exceptions::fthrow(
3839 THREAD_AND_LOCATION,
3840 vmSymbols::java_lang_UnsupportedClassVersionError(),
3841 "Unsupported major.minor version for dump time %u.%u",
3842 major_version,
3843 minor_version);
3844 }
3845
3846 // Check version numbers - we check this even with verifier off
3847 if (!is_supported_version(major_version, minor_version)) {
3848 if (name == NULL) {
3849 Exceptions::fthrow(
3850 THREAD_AND_LOCATION,
3851 vmSymbols::java_lang_UnsupportedClassVersionError(),
3852 "Unsupported class file version %u.%u, "
3853 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3854 major_version,
3855 minor_version,
3856 JAVA_MAX_SUPPORTED_VERSION,
3857 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3858 } else {
3859 ResourceMark rm(THREAD);
3860 Exceptions::fthrow(
3861 THREAD_AND_LOCATION,
3862 vmSymbols::java_lang_UnsupportedClassVersionError(),
3863 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3864 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3865 name->as_C_string(),
3866 major_version,
3867 minor_version,
3868 JAVA_MAX_SUPPORTED_VERSION,
3869 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3870 }
3871 return nullHandle;
3872 }
3873
3874 _major_version = major_version;
3875 _minor_version = minor_version;
3876
3877
3878 // Check if verification needs to be relaxed for this class file
3879 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3880 _relax_verify = Verifier::relax_verify_for(class_loader());
3881
3882 // Constant pool
3883 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3884
3885 int cp_size = cp->length();
3886
3887 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3888
3889 // Access flags
3890 AccessFlags access_flags;
3891 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3892
3893 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3894 // Set abstract bit for old class files for backward compatibility
3895 flags |= JVM_ACC_ABSTRACT;
3896 }
3897 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3898 access_flags.set_flags(flags);
3899
3900 // This class and superclass
3901 u2 this_class_index = cfs->get_u2_fast();
3902 check_property(
3903 valid_cp_range(this_class_index, cp_size) &&
3904 cp->tag_at(this_class_index).is_unresolved_klass(),
3905 "Invalid this class index %u in constant pool in class file %s",
3906 this_class_index, CHECK_(nullHandle));
3907
3908 Symbol* class_name = cp->klass_name_at(this_class_index);
3909 assert(class_name != NULL, "class_name can't be null");
3910
3911 // It's important to set parsed_name *before* resolving the super class.
3912 // (it's used for cleanup by the caller if parsing fails)
3913 parsed_name = class_name;
3914 // parsed_name is returned and can be used if there's an error, so add to
3915 // its reference count. Caller will decrement the refcount.
3916 parsed_name->increment_refcount();
3917
3918 // Update _class_name which could be null previously to be class_name
3919 _class_name = class_name;
3920
3921 // Don't need to check whether this class name is legal or not.
3922 // It has been checked when constant pool is parsed.
3923 // However, make sure it is not an array type.
3924 if (_need_verify) {
3925 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3926 "Bad class name in class file %s",
3927 CHECK_(nullHandle));
3928 }
3929
3930 Klass* preserve_this_klass; // for storing result across HandleMark
3931
3932 // release all handles when parsing is done
3933 { HandleMark hm(THREAD);
3934
3935 // Checks if name in class file matches requested name
3936 if (name != NULL && class_name != name) {
3937 ResourceMark rm(THREAD);
3938 Exceptions::fthrow(
3939 THREAD_AND_LOCATION,
3940 vmSymbols::java_lang_NoClassDefFoundError(),
3941 "%s (wrong name: %s)",
3942 name->as_C_string(),
3943 class_name->as_C_string()
3944 );
3945 return nullHandle;
3946 }
3947
3948 if (TraceClassLoadingPreorder) {
3949 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3950 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3951 tty->print_cr("]");
3952 }
3953 #if INCLUDE_CDS
3954 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3955 // Only dump the classes that can be stored into CDS archive
3956 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3957 if (name != NULL) {
3958 ResourceMark rm(THREAD);
3959 classlist_file->print_cr("%s", name->as_C_string());
3960 classlist_file->flush();
3961 }
3962 }
3963 }
3964 #endif
3965
3966 u2 super_class_index = cfs->get_u2_fast();
3967 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3968 CHECK_NULL);
3969
3970 // Interfaces
3971 u2 itfs_len = cfs->get_u2_fast();
3972 Array<Klass*>* local_interfaces =
3973 parse_interfaces(itfs_len, protection_domain, _class_name,
3974 &has_default_methods, CHECK_(nullHandle));
3975
3976 u2 java_fields_count = 0;
3977 // Fields (offsets are filled in later)
3978 FieldAllocationCount fac;
3979 Array<u2>* fields = parse_fields(class_name,
3980 access_flags.is_interface(),
3981 &fac, &java_fields_count,
3982 CHECK_(nullHandle));
3983 // Methods
3984 bool has_final_method = false;
3985 AccessFlags promoted_flags;
3986 promoted_flags.set_flags(0);
3987 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3988 &promoted_flags,
3989 &has_final_method,
3990 &declares_default_methods,
3991 CHECK_(nullHandle));
3992
3993 if (declares_default_methods) {
3994 has_default_methods = true;
3995 }
3996
3997 // Additional attributes
3998 ClassAnnotationCollector parsed_annotations;
3999 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
4000
4001 // Finalize the Annotations metadata object,
4002 // now that all annotation arrays have been created.
4003 create_combined_annotations(CHECK_(nullHandle));
4004
4005 // Make sure this is the end of class file stream
4006 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
4007
4008 // We check super class after class file is parsed and format is checked
4009 if (super_class_index > 0 && super_klass.is_null()) {
4010 Symbol* sk = cp->klass_name_at(super_class_index);
4011 if (access_flags.is_interface()) {
4012 // Before attempting to resolve the superclass, check for class format
4013 // errors not checked yet.
4014 guarantee_property(sk == vmSymbols::java_lang_Object(),
4015 "Interfaces must have java.lang.Object as superclass in class file %s",
4016 CHECK_(nullHandle));
4017 }
4018 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4019 class_loader,
4020 protection_domain,
4021 true,
4022 CHECK_(nullHandle));
4023
4024 KlassHandle kh (THREAD, k);
4025 super_klass = instanceKlassHandle(THREAD, kh());
4026 }
4027 if (super_klass.not_null()) {
4028
4029 if (super_klass->has_default_methods()) {
4030 has_default_methods = true;
4031 }
4032
4033 if (super_klass->is_interface()) {
4034 ResourceMark rm(THREAD);
4035 Exceptions::fthrow(
4036 THREAD_AND_LOCATION,
4037 vmSymbols::java_lang_IncompatibleClassChangeError(),
4038 "class %s has interface %s as super class",
4039 class_name->as_klass_external_name(),
4040 super_klass->external_name()
4041 );
4042 return nullHandle;
4043 }
4044 // Make sure super class is not final
4045 if (super_klass->is_final()) {
4046 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4047 }
4048 }
4049
4050 // save super klass for error handling.
4051 _super_klass = super_klass;
4052
4053 // Compute the transitive list of all unique interfaces implemented by this class
4054 _transitive_interfaces =
4055 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4056
4057 // sort methods
4058 intArray* method_ordering = sort_methods(methods);
4059
4060 // promote flags from parse_methods() to the klass' flags
4061 access_flags.add_promoted_flags(promoted_flags.as_int());
4062
4063 // Size of Java vtable (in words)
4064 int vtable_size = 0;
4065 int itable_size = 0;
4066 int num_miranda_methods = 0;
4067
4068 GrowableArray<Method*> all_mirandas(20);
4069
4070 klassVtable::compute_vtable_size_and_num_mirandas(
4071 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4072 access_flags, class_loader, class_name, local_interfaces,
4073 CHECK_(nullHandle));
4074
4075 // Size of Java itable (in words)
4076 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4077
4078 FieldLayoutInfo info;
4079 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4080
4081 int total_oop_map_size2 =
4082 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4083
4084 // Compute reference type
4085 ReferenceType rt;
4086 if (super_klass() == NULL) {
4087 rt = REF_NONE;
4088 } else {
4089 rt = super_klass->reference_type();
4090 }
4091
4092 // We can now create the basic Klass* for this klass
4093 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4094 vtable_size,
4095 itable_size,
4096 info.static_field_size,
4097 total_oop_map_size2,
4098 rt,
4099 access_flags,
4100 name,
4101 super_klass(),
4102 !host_klass.is_null(),
4103 CHECK_(nullHandle));
4104 instanceKlassHandle this_klass (THREAD, _klass);
4105
4106 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4107 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4108 "sanity");
4109
4110 // Fill in information already parsed
4111 this_klass->set_should_verify_class(verify);
4112 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4113 this_klass->set_layout_helper(lh);
4114 assert(this_klass->oop_is_instance(), "layout is correct");
4115 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4116 // Not yet: supers are done below to support the new subtype-checking fields
4117 //this_klass->set_super(super_klass());
4118 this_klass->set_class_loader_data(loader_data);
4119 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4120 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4121 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4122
4123 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4124
4125 if (has_final_method) {
4126 this_klass->set_has_final_method();
4127 }
4128 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4129 // The InstanceKlass::_methods_jmethod_ids cache
4130 // is managed on the assumption that the initial cache
4131 // size is equal to the number of methods in the class. If
4132 // that changes, then InstanceKlass::idnum_can_increment()
4133 // has to be changed accordingly.
4134 this_klass->set_initial_method_idnum(methods->length());
4135 this_klass->set_name(cp->klass_name_at(this_class_index));
4136 if (is_anonymous()) // I am well known to myself
4137 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4138
4139 this_klass->set_minor_version(minor_version);
4140 this_klass->set_major_version(major_version);
4141 this_klass->set_has_default_methods(has_default_methods);
4142 this_klass->set_declares_default_methods(declares_default_methods);
4143
4144 if (!host_klass.is_null()) {
4145 assert (this_klass->is_anonymous(), "should be the same");
4146 this_klass->set_host_klass(host_klass());
4147 }
4148
4149 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4150 // (We used to do this lazily, but now we query it in Rewriter,
4151 // which is eagerly done for every method, so we might as well do it now,
4152 // when everything is fresh in memory.)
4153 vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass());
4154 if (klass_id != vmSymbols::NO_SID) {
4155 for (int j = 0; j < methods->length(); j++) {
4156 Method* method = methods->at(j);
4157 method->init_intrinsic_id();
4158
4159 if (CheckIntrinsics) {
4160 // Check if an intrinsic is defined for method 'method',
4161 // but the method is not annotated with @HotSpotIntrinsicCandidate.
4162 if (method->intrinsic_id() != vmIntrinsics::_none &&
4163 !method->intrinsic_candidate()) {
4164 tty->print("Compiler intrinsic is defined for method [%s], "
4165 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
4166 method->name_and_sig_as_C_string(),
4167 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4168 );
4169 tty->cr();
4170 DEBUG_ONLY(vm_exit(1));
4171 }
4172 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
4173 // but there is no intrinsic available for it.
4174 if (method->intrinsic_candidate() &&
4175 method->intrinsic_id() == vmIntrinsics::_none) {
4176 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
4177 "but no compiler intrinsic is defined for the method.%s",
4178 method->name_and_sig_as_C_string(),
4179 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4180 );
4181 tty->cr();
4182 DEBUG_ONLY(vm_exit(1));
4183 }
4184 }
4185 }
4186
4187 #ifdef ASSERT
4188 if (CheckIntrinsics) {
4189 // Check for orphan methods in the current class. A method m
4190 // of a class C is orphan if an intrinsic is defined for method m,
4191 // but class C does not declare m.
4192 // The check is potentially expensive, therefore it is available
4193 // only in debug builds.
4194
4195 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) {
4196 if (id == vmIntrinsics::_compiledLambdaForm) {
4197 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4198 // generated for the JVM from a LambdaForm and therefore no method
4199 // is defined for it.
4200 continue;
4201 }
4202
4203 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
4204 // Check if the current class contains a method with the same
4205 // name, flags, signature.
4206 bool match = false;
4207 for (int j = 0; j < methods->length(); j++) {
4208 Method* method = methods->at(j);
4209 if (id == method->intrinsic_id()) {
4210 match = true;
4211 break;
4212 }
4213 }
4214
4215 if (!match) {
4216 char buf[1000];
4217 tty->print("Compiler intrinsic is defined for method [%s], "
4218 "but the method is not available in class [%s].%s",
4219 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)),
4220 this_klass->name()->as_C_string(),
4221 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4222 );
4223 tty->cr();
4224 DEBUG_ONLY(vm_exit(1));
4225 }
4226 }
4227 }
4228 }
4229 #endif // ASSERT
4230 }
4231
4232
4233 if (cached_class_file != NULL) {
4234 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4235 this_klass->set_cached_class_file(cached_class_file);
4236 }
4237
4238 // Fill in field values obtained by parse_classfile_attributes
4239 if (parsed_annotations.has_any_annotations())
4240 parsed_annotations.apply_to(this_klass);
4241 apply_parsed_class_attributes(this_klass);
4242
4243 // Miranda methods
4244 if ((num_miranda_methods > 0) ||
4245 // if this class introduced new miranda methods or
4246 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4247 // super class exists and this class inherited miranda methods
4248 ) {
4249 this_klass->set_has_miranda_methods(); // then set a flag
4250 }
4251
4252 // Fill in information needed to compute superclasses.
4253 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4254
4255 // Initialize itable offset tables
4256 klassItable::setup_itable_offset_table(this_klass);
4257
4258 // Compute transitive closure of interfaces this class implements
4259 // Do final class setup
4260 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4261
4262 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4263 set_precomputed_flags(this_klass);
4264
4265 // reinitialize modifiers, using the InnerClasses attribute
4266 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4267 this_klass->set_modifier_flags(computed_modifiers);
4268
4269 // check if this class can access its super class
4270 check_super_class_access(this_klass, CHECK_(nullHandle));
4271
4272 // check if this class can access its superinterfaces
4273 check_super_interface_access(this_klass, CHECK_(nullHandle));
4274
4275 // check if this class overrides any final method
4276 check_final_method_override(this_klass, CHECK_(nullHandle));
4277
4278 // check that if this class is an interface then it doesn't have static methods
4279 if (this_klass->is_interface()) {
4280 /* An interface in a JAVA 8 classfile can be static */
4281 if (_major_version < JAVA_8_VERSION) {
4282 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4283 }
4284 }
4285
4286 // Allocate mirror and initialize static fields
4287 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4288 CHECK_(nullHandle));
4289
4290 // Generate any default methods - default methods are interface methods
4291 // that have a default implementation. This is new with Lambda project.
4292 if (has_default_methods ) {
4293 DefaultMethods::generate_default_methods(
4294 this_klass(), &all_mirandas, CHECK_(nullHandle));
4295 }
4296
4297 // Update the loader_data graph.
4298 record_defined_class_dependencies(this_klass, CHECK_NULL);
4299
4300 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4301 false /* not shared class */);
4302
4303 if (TraceClassLoading) {
4304 ResourceMark rm;
4305 // print in a single call to reduce interleaving of output
4306 if (cfs->source() != NULL) {
4307 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4308 cfs->source());
4309 } else if (class_loader.is_null()) {
4310 Klass* caller =
4311 THREAD->is_Java_thread()
4312 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4313 : NULL;
4314 // caller can be NULL, for example, during a JVMTI VM_Init hook
4315 if (caller != NULL) {
4316 tty->print("[Loaded %s by instance of %s]\n",
4317 this_klass->external_name(),
4318 InstanceKlass::cast(caller)->external_name());
4319 } else {
4320 tty->print("[Loaded %s]\n", this_klass->external_name());
4321 }
4322 } else {
4323 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4324 InstanceKlass::cast(class_loader->klass())->external_name());
4325 }
4326 }
4327
4328 if (TraceClassResolution) {
4329 ResourceMark rm;
4330 // print out the superclass.
4331 const char * from = this_klass()->external_name();
4332 if (this_klass->java_super() != NULL) {
4333 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4334 }
4335 // print out each of the interface classes referred to by this class.
4336 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4337 if (local_interfaces != NULL) {
4338 int length = local_interfaces->length();
4339 for (int i = 0; i < length; i++) {
4340 Klass* k = local_interfaces->at(i);
4341 InstanceKlass* to_class = InstanceKlass::cast(k);
4342 const char * to = to_class->external_name();
4343 tty->print("RESOLVE %s %s (interface)\n", from, to);
4344 }
4345 }
4346 }
4347
4348 // preserve result across HandleMark
4349 preserve_this_klass = this_klass();
4350 }
4351
4352 // Create new handle outside HandleMark (might be needed for
4353 // Extended Class Redefinition)
4354 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4355 debug_only(this_klass->verify();)
4356
4357 // Clear class if no error has occurred so destructor doesn't deallocate it
4358 _klass = NULL;
4359 return this_klass;
4360 }
4361
4362 // Destructor to clean up if there's an error
4363 ClassFileParser::~ClassFileParser() {
4364 MetadataFactory::free_metadata(_loader_data, _cp);
4365 MetadataFactory::free_array<u2>(_loader_data, _fields);
4366
4367 // Free methods
4368 InstanceKlass::deallocate_methods(_loader_data, _methods);
4369
4370 // beware of the Universe::empty_blah_array!!
4371 if (_inner_classes != Universe::the_empty_short_array()) {
4372 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4373 }
4374
4375 // Free interfaces
4376 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4377 _local_interfaces, _transitive_interfaces);
4378
4379 if (_combined_annotations != NULL) {
4380 // After all annotations arrays have been created, they are installed into the
4381 // Annotations object that will be assigned to the InstanceKlass being created.
4382
4383 // Deallocate the Annotations object and the installed annotations arrays.
4384 _combined_annotations->deallocate_contents(_loader_data);
4385
4386 // If the _combined_annotations pointer is non-NULL,
4387 // then the other annotations fields should have been cleared.
4388 assert(_annotations == NULL, "Should have been cleared");
4389 assert(_type_annotations == NULL, "Should have been cleared");
4390 assert(_fields_annotations == NULL, "Should have been cleared");
4391 assert(_fields_type_annotations == NULL, "Should have been cleared");
4392 } else {
4393 // If the annotations arrays were not installed into the Annotations object,
4394 // then they have to be deallocated explicitly.
4395 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4396 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4397 Annotations::free_contents(_loader_data, _fields_annotations);
4398 Annotations::free_contents(_loader_data, _fields_type_annotations);
4399 }
4400
4401 clear_class_metadata();
4402
4403 // deallocate the klass if already created. Don't directly deallocate, but add
4404 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4405 // at a safepoint.
4406 if (_klass != NULL) {
4407 _loader_data->add_to_deallocate_list(_klass);
4408 }
4409 _klass = NULL;
4410 }
4411
4412 void ClassFileParser::print_field_layout(Symbol* name,
4413 Array<u2>* fields,
4414 constantPoolHandle cp,
4415 int instance_size,
4416 int instance_fields_start,
4417 int instance_fields_end,
4418 int static_fields_end) {
4419 tty->print("%s: field layout\n", name->as_klass_external_name());
4420 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4421 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4422 if (!fs.access_flags().is_static()) {
4423 tty->print(" @%3d \"%s\" %s\n",
4424 fs.offset(),
4425 fs.name()->as_klass_external_name(),
4426 fs.signature()->as_klass_external_name());
4427 }
4428 }
4429 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4430 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4431 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4432 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4433 if (fs.access_flags().is_static()) {
4434 tty->print(" @%3d \"%s\" %s\n",
4435 fs.offset(),
4436 fs.name()->as_klass_external_name(),
4437 fs.signature()->as_klass_external_name());
4438 }
4439 }
4440 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4441 tty->print("\n");
4442 }
4443
4444 unsigned int
4445 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4446 unsigned int nonstatic_oop_map_count,
4447 int first_nonstatic_oop_offset) {
4448 unsigned int map_count =
4449 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4450 if (nonstatic_oop_map_count > 0) {
4451 // We have oops to add to map
4452 if (map_count == 0) {
4453 map_count = nonstatic_oop_map_count;
4454 } else {
4455 // Check whether we should add a new map block or whether the last one can
4456 // be extended
4457 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4458 OopMapBlock* const last_map = first_map + map_count - 1;
4459
4460 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4461 if (next_offset == first_nonstatic_oop_offset) {
4462 // There is no gap bettwen superklass's last oop field and first
4463 // local oop field, merge maps.
4464 nonstatic_oop_map_count -= 1;
4465 } else {
4466 // Superklass didn't end with a oop field, add extra maps
4467 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4468 }
4469 map_count += nonstatic_oop_map_count;
4470 }
4471 }
4472 return map_count;
4473 }
4474
4475
4476 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4477 unsigned int nonstatic_oop_map_count,
4478 int* nonstatic_oop_offsets,
4479 unsigned int* nonstatic_oop_counts) {
4480 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4481 const InstanceKlass* const super = k->superklass();
4482 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4483 if (super_count > 0) {
4484 // Copy maps from superklass
4485 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4486 for (unsigned int i = 0; i < super_count; ++i) {
4487 *this_oop_map++ = *super_oop_map++;
4488 }
4489 }
4490
4491 if (nonstatic_oop_map_count > 0) {
4492 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4493 // The counts differ because there is no gap between superklass's last oop
4494 // field and the first local oop field. Extend the last oop map copied
4495 // from the superklass instead of creating new one.
4496 nonstatic_oop_map_count--;
4497 nonstatic_oop_offsets++;
4498 this_oop_map--;
4499 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4500 this_oop_map++;
4501 }
4502
4503 // Add new map blocks, fill them
4504 while (nonstatic_oop_map_count-- > 0) {
4505 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4506 this_oop_map->set_count(*nonstatic_oop_counts++);
4507 this_oop_map++;
4508 }
4509 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4510 this_oop_map, "sanity");
4511 }
4512 }
4513
4514
4515 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4516 Klass* super = k->super();
4517
4518 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4519 // in which case we don't have to register objects as finalizable
4520 if (!_has_empty_finalizer) {
4521 if (_has_finalizer ||
4522 (super != NULL && super->has_finalizer())) {
4523 k->set_has_finalizer();
4524 }
4525 }
4526
4527 #ifdef ASSERT
4528 bool f = false;
4529 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4530 vmSymbols::void_method_signature());
4531 if (m != NULL && !m->is_empty_method()) {
4532 f = true;
4533 }
4534
4535 // Spec doesn't prevent agent from redefinition of empty finalizer.
4536 // Despite the fact that it's generally bad idea and redefined finalizer
4537 // will not work as expected we shouldn't abort vm in this case
4538 if (!k->has_redefined_this_or_super()) {
4539 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4540 }
4541 #endif
4542
4543 // Check if this klass supports the java.lang.Cloneable interface
4544 if (SystemDictionary::Cloneable_klass_loaded()) {
4545 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4546 k->set_is_cloneable();
4547 }
4548 }
4549
4550 // Check if this klass has a vanilla default constructor
4551 if (super == NULL) {
4552 // java.lang.Object has empty default constructor
4553 k->set_has_vanilla_constructor();
4554 } else {
4555 if (super->has_vanilla_constructor() &&
4556 _has_vanilla_constructor) {
4557 k->set_has_vanilla_constructor();
4558 }
4559 #ifdef ASSERT
4560 bool v = false;
4561 if (super->has_vanilla_constructor()) {
4562 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4563 ), vmSymbols::void_method_signature());
4564 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4565 v = true;
4566 }
4567 }
4568 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4569 #endif
4570 }
4571
4572 // If it cannot be fast-path allocated, set a bit in the layout helper.
4573 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4574 assert(k->size_helper() > 0, "layout_helper is initialized");
4575 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4576 || k->is_abstract() || k->is_interface()
4577 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4578 || k->size_helper() >= FastAllocateSizeLimit) {
4579 // Forbid fast-path allocation.
4580 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4581 k->set_layout_helper(lh);
4582 }
4583 }
4584
4585 // Attach super classes and interface classes to class loader data
4586 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4587 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4588 if (defining_loader_data->is_the_null_class_loader_data()) {
4589 // Dependencies to null class loader data are implicit.
4590 return;
4591 } else {
4592 // add super class dependency
4593 Klass* super = defined_klass->super();
4594 if (super != NULL) {
4595 defining_loader_data->record_dependency(super, CHECK);
4596 }
4597
4598 // add super interface dependencies
4599 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4600 if (local_interfaces != NULL) {
4601 int length = local_interfaces->length();
4602 for (int i = 0; i < length; i++) {
4603 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4604 }
4605 }
4606 }
4607 }
4608
4609 // utility methods for appending an array with check for duplicates
4610
4611 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4612 // iterate over new interfaces
4613 for (int i = 0; i < ifs->length(); i++) {
4614 Klass* e = ifs->at(i);
4615 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4616 // add new interface
4617 result->append_if_missing(e);
4618 }
4619 }
4620
4621 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4622 instanceKlassHandle super,
4623 Array<Klass*>* local_ifs, TRAPS) {
4624 // Compute maximum size for transitive interfaces
4625 int max_transitive_size = 0;
4626 int super_size = 0;
4627 // Add superclass transitive interfaces size
4628 if (super.not_null()) {
4629 super_size = super->transitive_interfaces()->length();
4630 max_transitive_size += super_size;
4631 }
4632 // Add local interfaces' super interfaces
4633 int local_size = local_ifs->length();
4634 for (int i = 0; i < local_size; i++) {
4635 Klass* l = local_ifs->at(i);
4636 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4637 }
4638 // Finally add local interfaces
4639 max_transitive_size += local_size;
4640 // Construct array
4641 if (max_transitive_size == 0) {
4642 // no interfaces, use canonicalized array
4643 return Universe::the_empty_klass_array();
4644 } else if (max_transitive_size == super_size) {
4645 // no new local interfaces added, share superklass' transitive interface array
4646 return super->transitive_interfaces();
4647 } else if (max_transitive_size == local_size) {
4648 // only local interfaces added, share local interface array
4649 return local_ifs;
4650 } else {
4651 ResourceMark rm;
4652 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4653
4654 // Copy down from superclass
4655 if (super.not_null()) {
4656 append_interfaces(result, super->transitive_interfaces());
4657 }
4658
4659 // Copy down from local interfaces' superinterfaces
4660 for (int i = 0; i < local_ifs->length(); i++) {
4661 Klass* l = local_ifs->at(i);
4662 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4663 }
4664 // Finally add local interfaces
4665 append_interfaces(result, local_ifs);
4666
4667 // length will be less than the max_transitive_size if duplicates were removed
4668 int length = result->length();
4669 assert(length <= max_transitive_size, "just checking");
4670 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4671 for (int i = 0; i < length; i++) {
4672 Klass* e = result->at(i);
4673 assert(e != NULL, "just checking");
4674 new_result->at_put(i, e);
4675 }
4676 return new_result;
4677 }
4678 }
4679
4680 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4681 Klass* super = this_klass->super();
4682 if ((super != NULL) &&
4683 (!Reflection::verify_class_access(this_klass(), super, false))) {
4684 ResourceMark rm(THREAD);
4685 Exceptions::fthrow(
4686 THREAD_AND_LOCATION,
4687 vmSymbols::java_lang_IllegalAccessError(),
4688 "class %s cannot access its superclass %s",
4689 this_klass->external_name(),
4690 InstanceKlass::cast(super)->external_name()
4691 );
4692 return;
4693 }
4694 }
4695
4696
4697 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4698 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4699 int lng = local_interfaces->length();
4700 for (int i = lng - 1; i >= 0; i--) {
4701 Klass* k = local_interfaces->at(i);
4702 assert (k != NULL && k->is_interface(), "invalid interface");
4703 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4704 ResourceMark rm(THREAD);
4705 Exceptions::fthrow(
4706 THREAD_AND_LOCATION,
4707 vmSymbols::java_lang_IllegalAccessError(),
4708 "class %s cannot access its superinterface %s",
4709 this_klass->external_name(),
4710 InstanceKlass::cast(k)->external_name()
4711 );
4712 return;
4713 }
4714 }
4715 }
4716
4717
4718 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4719 Array<Method*>* methods = this_klass->methods();
4720 int num_methods = methods->length();
4721
4722 // go thru each method and check if it overrides a final method
4723 for (int index = 0; index < num_methods; index++) {
4724 Method* m = methods->at(index);
4725
4726 // skip private, static, and <init> methods
4727 if ((!m->is_private() && !m->is_static()) &&
4728 (m->name() != vmSymbols::object_initializer_name())) {
4729
4730 Symbol* name = m->name();
4731 Symbol* signature = m->signature();
4732 Klass* k = this_klass->super();
4733 Method* super_m = NULL;
4734 while (k != NULL) {
4735 // skip supers that don't have final methods.
4736 if (k->has_final_method()) {
4737 // lookup a matching method in the super class hierarchy
4738 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4739 if (super_m == NULL) {
4740 break; // didn't find any match; get out
4741 }
4742
4743 if (super_m->is_final() && !super_m->is_static() &&
4744 // matching method in super is final, and not static
4745 (Reflection::verify_field_access(this_klass(),
4746 super_m->method_holder(),
4747 super_m->method_holder(),
4748 super_m->access_flags(), false))
4749 // this class can access super final method and therefore override
4750 ) {
4751 ResourceMark rm(THREAD);
4752 Exceptions::fthrow(
4753 THREAD_AND_LOCATION,
4754 vmSymbols::java_lang_VerifyError(),
4755 "class %s overrides final method %s.%s%s",
4756 this_klass->external_name(),
4757 super_m->method_holder()->external_name(),
4758 name->as_C_string(),
4759 signature->as_C_string()
4760 );
4761 return;
4762 }
4763
4764 // continue to look from super_m's holder's super.
4765 k = super_m->method_holder()->super();
4766 continue;
4767 }
4768
4769 k = k->super();
4770 }
4771 }
4772 }
4773 }
4774
4775
4776 // assumes that this_klass is an interface
4777 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4778 assert(this_klass->is_interface(), "not an interface");
4779 Array<Method*>* methods = this_klass->methods();
4780 int num_methods = methods->length();
4781
4782 for (int index = 0; index < num_methods; index++) {
4783 Method* m = methods->at(index);
4784 // if m is static and not the init method, throw a verify error
4785 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4786 ResourceMark rm(THREAD);
4787 Exceptions::fthrow(
4788 THREAD_AND_LOCATION,
4789 vmSymbols::java_lang_VerifyError(),
4790 "Illegal static method %s in interface %s",
4791 m->name()->as_C_string(),
4792 this_klass->external_name()
4793 );
4794 return;
4795 }
4796 }
4797 }
4798
4799 // utility methods for format checking
4800
4801 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4802 if (!_need_verify) { return; }
4803
4804 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4805 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4806 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4807 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4808 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4809 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4810 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4811
4812 if ((is_abstract && is_final) ||
4813 (is_interface && !is_abstract) ||
4814 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4815 (!is_interface && major_gte_15 && is_annotation)) {
4816 ResourceMark rm(THREAD);
4817 Exceptions::fthrow(
4818 THREAD_AND_LOCATION,
4819 vmSymbols::java_lang_ClassFormatError(),
4820 "Illegal class modifiers in class %s: 0x%X",
4821 _class_name->as_C_string(), flags
4822 );
4823 return;
4824 }
4825 }
4826
4827 bool ClassFileParser::has_illegal_visibility(jint flags) {
4828 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4829 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4830 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4831
4832 return ((is_public && is_protected) ||
4833 (is_public && is_private) ||
4834 (is_protected && is_private));
4835 }
4836
4837 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4838 u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4839 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4840 (major <= max_version) &&
4841 ((major != max_version) ||
4842 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4843 }
4844
4845 void ClassFileParser::verify_legal_field_modifiers(
4846 jint flags, bool is_interface, TRAPS) {
4847 if (!_need_verify) { return; }
4848
4849 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4850 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4851 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4852 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4853 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4854 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4855 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4856 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4857 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4858
4859 bool is_illegal = false;
4860
4861 if (is_interface) {
4862 if (!is_public || !is_static || !is_final || is_private ||
4863 is_protected || is_volatile || is_transient ||
4864 (major_gte_15 && is_enum)) {
4865 is_illegal = true;
4866 }
4867 } else { // not interface
4868 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4869 is_illegal = true;
4870 }
4871 }
4872
4873 if (is_illegal) {
4874 ResourceMark rm(THREAD);
4875 Exceptions::fthrow(
4876 THREAD_AND_LOCATION,
4877 vmSymbols::java_lang_ClassFormatError(),
4878 "Illegal field modifiers in class %s: 0x%X",
4879 _class_name->as_C_string(), flags);
4880 return;
4881 }
4882 }
4883
4884 void ClassFileParser::verify_legal_method_modifiers(
4885 jint flags, bool is_interface, Symbol* name, TRAPS) {
4886 if (!_need_verify) { return; }
4887
4888 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4889 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4890 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4891 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4892 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4893 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4894 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4895 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4896 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4897 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4898 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4899 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4900 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4901
4902 bool is_illegal = false;
4903
4904 if (is_interface) {
4905 if (major_gte_8) {
4906 // Class file version is JAVA_8_VERSION or later Methods of
4907 // interfaces may set any of the flags except ACC_PROTECTED,
4908 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4909 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4910 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4911 (is_native || is_protected || is_final || is_synchronized) ||
4912 // If a specific method of a class or interface has its
4913 // ACC_ABSTRACT flag set, it must not have any of its
4914 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4915 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4916 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4917 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4918 (is_abstract && (is_private || is_static || is_strict))) {
4919 is_illegal = true;
4920 }
4921 } else if (major_gte_15) {
4922 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4923 if (!is_public || is_static || is_final || is_synchronized ||
4924 is_native || !is_abstract || is_strict) {
4925 is_illegal = true;
4926 }
4927 } else {
4928 // Class file version is pre-JAVA_1_5_VERSION
4929 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4930 is_illegal = true;
4931 }
4932 }
4933 } else { // not interface
4934 if (has_illegal_visibility(flags)) {
4935 is_illegal = true;
4936 } else {
4937 if (is_initializer) {
4938 if (is_static || is_final || is_synchronized || is_native ||
4939 is_abstract || (major_gte_15 && is_bridge)) {
4940 is_illegal = true;
4941 }
4942 } else { // not initializer
4943 if (is_abstract) {
4944 if ((is_final || is_native || is_private || is_static ||
4945 (major_gte_15 && (is_synchronized || is_strict)))) {
4946 is_illegal = true;
4947 }
4948 }
4949 }
4950 }
4951 }
4952
4953 if (is_illegal) {
4954 ResourceMark rm(THREAD);
4955 Exceptions::fthrow(
4956 THREAD_AND_LOCATION,
4957 vmSymbols::java_lang_ClassFormatError(),
4958 "Method %s in class %s has illegal modifiers: 0x%X",
4959 name->as_C_string(), _class_name->as_C_string(), flags);
4960 return;
4961 }
4962 }
4963
4964 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4965 assert(_need_verify, "only called when _need_verify is true");
4966 int i = 0;
4967 int count = length >> 2;
4968 for (int k=0; k<count; k++) {
4969 unsigned char b0 = buffer[i];
4970 unsigned char b1 = buffer[i+1];
4971 unsigned char b2 = buffer[i+2];
4972 unsigned char b3 = buffer[i+3];
4973 // For an unsigned char v,
4974 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4975 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4976 unsigned char res = b0 | b0 - 1 |
4977 b1 | b1 - 1 |
4978 b2 | b2 - 1 |
4979 b3 | b3 - 1;
4980 if (res >= 128) break;
4981 i += 4;
4982 }
4983 for(; i < length; i++) {
4984 unsigned short c;
4985 // no embedded zeros
4986 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4987 if(buffer[i] < 128) {
4988 continue;
4989 }
4990 if ((i + 5) < length) { // see if it's legal supplementary character
4991 if (UTF8::is_supplementary_character(&buffer[i])) {
4992 c = UTF8::get_supplementary_character(&buffer[i]);
4993 i += 5;
4994 continue;
4995 }
4996 }
4997 switch (buffer[i] >> 4) {
4998 default: break;
4999 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
5000 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5001 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
5002 c = (buffer[i] & 0x1F) << 6;
5003 i++;
5004 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
5005 c += buffer[i] & 0x3F;
5006 if (_major_version <= 47 || c == 0 || c >= 0x80) {
5007 // for classes with major > 47, c must a null or a character in its shortest form
5008 break;
5009 }
5010 }
5011 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5012 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
5013 c = (buffer[i] & 0xF) << 12;
5014 i += 2;
5015 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
5016 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
5017 if (_major_version <= 47 || c >= 0x800) {
5018 // for classes with major > 47, c must be in its shortest form
5019 break;
5020 }
5021 }
5022 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5023 } // end of switch
5024 } // end of for
5025 }
5026
5027 // Checks if name is a legal class name.
5028 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
5029 if (!_need_verify || _relax_verify) { return; }
5030
5031 char buf[fixed_buffer_size];
5032 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5033 unsigned int length = name->utf8_length();
5034 bool legal = false;
5035
5036 if (length > 0) {
5037 char* p;
5038 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5039 p = skip_over_field_signature(bytes, false, length, CHECK);
5040 legal = (p != NULL) && ((p - bytes) == (int)length);
5041 } else if (_major_version < JAVA_1_5_VERSION) {
5042 if (bytes[0] != '<') {
5043 p = skip_over_field_name(bytes, true, length);
5044 legal = (p != NULL) && ((p - bytes) == (int)length);
5045 }
5046 } else {
5047 // 4900761: relax the constraints based on JSR202 spec
5048 // Class names may be drawn from the entire Unicode character set.
5049 // Identifiers between '/' must be unqualified names.
5050 // The utf8 string has been verified when parsing cpool entries.
5051 legal = verify_unqualified_name(bytes, length, LegalClass);
5052 }
5053 }
5054 if (!legal) {
5055 ResourceMark rm(THREAD);
5056 Exceptions::fthrow(
5057 THREAD_AND_LOCATION,
5058 vmSymbols::java_lang_ClassFormatError(),
5059 "Illegal class name \"%s\" in class file %s", bytes,
5060 _class_name->as_C_string()
5061 );
5062 return;
5063 }
5064 }
5065
5066 // Checks if name is a legal field name.
5067 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
5068 if (!_need_verify || _relax_verify) { return; }
5069
5070 char buf[fixed_buffer_size];
5071 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5072 unsigned int length = name->utf8_length();
5073 bool legal = false;
5074
5075 if (length > 0) {
5076 if (_major_version < JAVA_1_5_VERSION) {
5077 if (bytes[0] != '<') {
5078 char* p = skip_over_field_name(bytes, false, length);
5079 legal = (p != NULL) && ((p - bytes) == (int)length);
5080 }
5081 } else {
5082 // 4881221: relax the constraints based on JSR202 spec
5083 legal = verify_unqualified_name(bytes, length, LegalField);
5084 }
5085 }
5086
5087 if (!legal) {
5088 ResourceMark rm(THREAD);
5089 Exceptions::fthrow(
5090 THREAD_AND_LOCATION,
5091 vmSymbols::java_lang_ClassFormatError(),
5092 "Illegal field name \"%s\" in class %s", bytes,
5093 _class_name->as_C_string()
5094 );
5095 return;
5096 }
5097 }
5098
5099 // Checks if name is a legal method name.
5100 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5101 if (!_need_verify || _relax_verify) { return; }
5102
5103 assert(name != NULL, "method name is null");
5104 char buf[fixed_buffer_size];
5105 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5106 unsigned int length = name->utf8_length();
5107 bool legal = false;
5108
5109 if (length > 0) {
5110 if (bytes[0] == '<') {
5111 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5112 legal = true;
5113 }
5114 } else if (_major_version < JAVA_1_5_VERSION) {
5115 char* p;
5116 p = skip_over_field_name(bytes, false, length);
5117 legal = (p != NULL) && ((p - bytes) == (int)length);
5118 } else {
5119 // 4881221: relax the constraints based on JSR202 spec
5120 legal = verify_unqualified_name(bytes, length, LegalMethod);
5121 }
5122 }
5123
5124 if (!legal) {
5125 ResourceMark rm(THREAD);
5126 Exceptions::fthrow(
5127 THREAD_AND_LOCATION,
5128 vmSymbols::java_lang_ClassFormatError(),
5129 "Illegal method name \"%s\" in class %s", bytes,
5130 _class_name->as_C_string()
5131 );
5132 return;
5133 }
5134 }
5135
5136
5137 // Checks if signature is a legal field signature.
5138 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5139 if (!_need_verify) { return; }
5140
5141 char buf[fixed_buffer_size];
5142 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5143 unsigned int length = signature->utf8_length();
5144 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5145
5146 if (p == NULL || (p - bytes) != (int)length) {
5147 throwIllegalSignature("Field", name, signature, CHECK);
5148 }
5149 }
5150
5151 // Checks if signature is a legal method signature.
5152 // Returns number of parameters
5153 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5154 if (!_need_verify) {
5155 // make sure caller's args_size will be less than 0 even for non-static
5156 // method so it will be recomputed in compute_size_of_parameters().
5157 return -2;
5158 }
5159
5160 unsigned int args_size = 0;
5161 char buf[fixed_buffer_size];
5162 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5163 unsigned int length = signature->utf8_length();
5164 char* nextp;
5165
5166 // The first character must be a '('
5167 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5168 length--;
5169 // Skip over legal field signatures
5170 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5171 while ((length > 0) && (nextp != NULL)) {
5172 args_size++;
5173 if (p[0] == 'J' || p[0] == 'D') {
5174 args_size++;
5175 }
5176 length -= nextp - p;
5177 p = nextp;
5178 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5179 }
5180 // The first non-signature thing better be a ')'
5181 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5182 length--;
5183 if (name == vmSymbols::object_initializer_name()) {
5184 // All "<init>" methods must return void
5185 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5186 return args_size;
5187 }
5188 } else {
5189 // Now we better just have a return value
5190 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5191 if (nextp && ((int)length == (nextp - p))) {
5192 return args_size;
5193 }
5194 }
5195 }
5196 }
5197 // Report error
5198 throwIllegalSignature("Method", name, signature, CHECK_0);
5199 return 0;
5200 }
5201
5202
5203 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5204 // Method names also may not contain the characters '<' or '>', unless <init>
5205 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5206 // method. Because these names have been checked as special cases before
5207 // calling this method in verify_legal_method_name.
5208 bool ClassFileParser::verify_unqualified_name(
5209 char* name, unsigned int length, int type) {
5210 jchar ch;
5211
5212 for (char* p = name; p != name + length; ) {
5213 ch = *p;
5214 if (ch < 128) {
5215 p++;
5216 if (ch == '.' || ch == ';' || ch == '[' ) {
5217 return false; // do not permit '.', ';', or '['
5218 }
5219 if (type != LegalClass && ch == '/') {
5220 return false; // do not permit '/' unless it's class name
5221 }
5222 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5223 return false; // do not permit '<' or '>' in method names
5224 }
5225 } else {
5226 char* tmp_p = UTF8::next(p, &ch);
5227 p = tmp_p;
5228 }
5229 }
5230 return true;
5231 }
5232
5233
5234 // Take pointer to a string. Skip over the longest part of the string that could
5235 // be taken as a fieldname. Allow '/' if slash_ok is true.
5236 // Return a pointer to just past the fieldname.
5237 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5238 // being true, we saw consecutive slashes (meaning we were looking for a
5239 // qualified path but found something that was badly-formed).
5240 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5241 char* p;
5242 jchar ch;
5243 jboolean last_is_slash = false;
5244 jboolean not_first_ch = false;
5245
5246 for (p = name; p != name + length; not_first_ch = true) {
5247 char* old_p = p;
5248 ch = *p;
5249 if (ch < 128) {
5250 p++;
5251 // quick check for ascii
5252 if ((ch >= 'a' && ch <= 'z') ||
5253 (ch >= 'A' && ch <= 'Z') ||
5254 (ch == '_' || ch == '$') ||
5255 (not_first_ch && ch >= '0' && ch <= '9')) {
5256 last_is_slash = false;
5257 continue;
5258 }
5259 if (slash_ok && ch == '/') {
5260 if (last_is_slash) {
5261 return NULL; // Don't permit consecutive slashes
5262 }
5263 last_is_slash = true;
5264 continue;
5265 }
5266 } else {
5267 jint unicode_ch;
5268 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5269 p = tmp_p;
5270 last_is_slash = false;
5271 // Check if ch is Java identifier start or is Java identifier part
5272 // 4672820: call java.lang.Character methods directly without generating separate tables.
5273 EXCEPTION_MARK;
5274 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5275
5276 // return value
5277 JavaValue result(T_BOOLEAN);
5278 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5279 JavaCallArguments args;
5280 args.push_int(unicode_ch);
5281
5282 // public static boolean isJavaIdentifierStart(char ch);
5283 JavaCalls::call_static(&result,
5284 klass,
5285 vmSymbols::isJavaIdentifierStart_name(),
5286 vmSymbols::int_bool_signature(),
5287 &args,
5288 THREAD);
5289
5290 if (HAS_PENDING_EXCEPTION) {
5291 CLEAR_PENDING_EXCEPTION;
5292 return 0;
5293 }
5294 if (result.get_jboolean()) {
5295 continue;
5296 }
5297
5298 if (not_first_ch) {
5299 // public static boolean isJavaIdentifierPart(char ch);
5300 JavaCalls::call_static(&result,
5301 klass,
5302 vmSymbols::isJavaIdentifierPart_name(),
5303 vmSymbols::int_bool_signature(),
5304 &args,
5305 THREAD);
5306
5307 if (HAS_PENDING_EXCEPTION) {
5308 CLEAR_PENDING_EXCEPTION;
5309 return 0;
5310 }
5311
5312 if (result.get_jboolean()) {
5313 continue;
5314 }
5315 }
5316 }
5317 return (not_first_ch) ? old_p : NULL;
5318 }
5319 return (not_first_ch) ? p : NULL;
5320 }
5321
5322
5323 // Take pointer to a string. Skip over the longest part of the string that could
5324 // be taken as a field signature. Allow "void" if void_ok.
5325 // Return a pointer to just past the signature.
5326 // Return NULL if no legal signature is found.
5327 char* ClassFileParser::skip_over_field_signature(char* signature,
5328 bool void_ok,
5329 unsigned int length,
5330 TRAPS) {
5331 unsigned int array_dim = 0;
5332 while (length > 0) {
5333 switch (signature[0]) {
5334 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5335 case JVM_SIGNATURE_BOOLEAN:
5336 case JVM_SIGNATURE_BYTE:
5337 case JVM_SIGNATURE_CHAR:
5338 case JVM_SIGNATURE_SHORT:
5339 case JVM_SIGNATURE_INT:
5340 case JVM_SIGNATURE_FLOAT:
5341 case JVM_SIGNATURE_LONG:
5342 case JVM_SIGNATURE_DOUBLE:
5343 return signature + 1;
5344 case JVM_SIGNATURE_CLASS: {
5345 if (_major_version < JAVA_1_5_VERSION) {
5346 // Skip over the class name if one is there
5347 char* p = skip_over_field_name(signature + 1, true, --length);
5348
5349 // The next character better be a semicolon
5350 if (p && (p - signature) > 1 && p[0] == ';') {
5351 return p + 1;
5352 }
5353 } else {
5354 // 4900761: For class version > 48, any unicode is allowed in class name.
5355 length--;
5356 signature++;
5357 while (length > 0 && signature[0] != ';') {
5358 if (signature[0] == '.') {
5359 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5360 }
5361 length--;
5362 signature++;
5363 }
5364 if (signature[0] == ';') { return signature + 1; }
5365 }
5366
5367 return NULL;
5368 }
5369 case JVM_SIGNATURE_ARRAY:
5370 array_dim++;
5371 if (array_dim > 255) {
5372 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5373 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5374 }
5375 // The rest of what's there better be a legal signature
5376 signature++;
5377 length--;
5378 void_ok = false;
5379 break;
5380
5381 default:
5382 return NULL;
5383 }
5384 }
5385 return NULL;
5386 }