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 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1758 if (_location != _in_field) break; // only allow for fields
1759 if (!privileged) break; // only allow in privileged code
1760 return _field_Stable;
1761 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1762 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1763 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1764 return _sun_misc_Contended;
1765 default: break;
1766 }
1767 return AnnotationCollector::_unknown;
1768 }
1769
1770 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1771 if (is_contended())
1772 f->set_contended_group(contended_group());
1773 if (is_stable())
1774 f->set_stable(true);
1775 }
1776
1777 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1778 // If there's an error deallocate metadata for field annotations
1779 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1780 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1781 }
1782
1783 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1784 if (has_annotation(_method_CallerSensitive))
1785 m->set_caller_sensitive(true);
1786 if (has_annotation(_method_ForceInline))
1787 m->set_force_inline(true);
1788 if (has_annotation(_method_DontInline))
1789 m->set_dont_inline(true);
1790 if (has_annotation(_method_InjectedProfile))
1791 m->set_has_injected_profile(true);
1792 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1793 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1794 if (has_annotation(_method_LambdaForm_Hidden))
1795 m->set_hidden(true);
1796 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
1797 m->set_intrinsic_candidate(true);
1798 }
1799
1800 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1801 k->set_is_contended(is_contended());
1802 }
1803
1804
1805 #define MAX_ARGS_SIZE 255
1806 #define MAX_CODE_SIZE 65535
1807 #define INITIAL_MAX_LVT_NUMBER 256
1808
1809 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1810 *
1811 * Rules for LVT's and LVTT's are:
1812 * - There can be any number of LVT's and LVTT's.
1813 * - If there are n LVT's, it is the same as if there was just
1814 * one LVT containing all the entries from the n LVT's.
1815 * - There may be no more than one LVT entry per local variable.
1816 * Two LVT entries are 'equal' if these fields are the same:
1817 * start_pc, length, name, slot
1818 * - There may be no more than one LVTT entry per each LVT entry.
1819 * Each LVTT entry has to match some LVT entry.
1820 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1821 */
1822 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1823 int lvt_cnt,
1824 u2* localvariable_table_length,
1825 u2** localvariable_table_start,
1826 int lvtt_cnt,
1827 u2* localvariable_type_table_length,
1828 u2** localvariable_type_table_start,
1829 TRAPS) {
1830
1831 ResourceMark rm(THREAD);
1832
1833 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1834 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1835
1836 LVT_HashTable* table = new LVT_HashTable();
1837
1838 // To fill LocalVariableTable in
1839 Classfile_LVT_Element* cf_lvt;
1840 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1841
1842 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1843 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1844 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1845 copy_lvt_element(&cf_lvt[idx], lvt);
1846 // If no duplicates, add LVT elem in hashtable.
1847 if (table->put(*lvt, lvt) == false
1848 && _need_verify
1849 && _major_version >= JAVA_1_5_VERSION) {
1850 classfile_parse_error("Duplicated LocalVariableTable attribute "
1851 "entry for '%s' in class file %s",
1852 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1853 CHECK);
1854 }
1855 }
1856 }
1857
1858 // To merge LocalVariableTable and LocalVariableTypeTable
1859 Classfile_LVT_Element* cf_lvtt;
1860 LocalVariableTableElement lvtt_elem;
1861
1862 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1863 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1864 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1865 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1866 LocalVariableTableElement** entry = table->get(lvtt_elem);
1867 if (entry == NULL) {
1868 if (_need_verify) {
1869 classfile_parse_error("LVTT entry for '%s' in class file %s "
1870 "does not match any LVT entry",
1871 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1872 CHECK);
1873 }
1874 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1875 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1876 "entry for '%s' in class file %s",
1877 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1878 CHECK);
1879 } else {
1880 // to add generic signatures into LocalVariableTable
1881 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1882 }
1883 }
1884 }
1885 }
1886
1887
1888 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1889 u1* runtime_visible_annotations,
1890 int runtime_visible_annotations_length,
1891 u1* runtime_invisible_annotations,
1892 int runtime_invisible_annotations_length,
1893 u1* runtime_visible_parameter_annotations,
1894 int runtime_visible_parameter_annotations_length,
1895 u1* runtime_invisible_parameter_annotations,
1896 int runtime_invisible_parameter_annotations_length,
1897 u1* runtime_visible_type_annotations,
1898 int runtime_visible_type_annotations_length,
1899 u1* runtime_invisible_type_annotations,
1900 int runtime_invisible_type_annotations_length,
1901 u1* annotation_default,
1902 int annotation_default_length,
1903 TRAPS) {
1904
1905 AnnotationArray* a;
1906
1907 if (runtime_visible_annotations_length +
1908 runtime_invisible_annotations_length > 0) {
1909 a = assemble_annotations(runtime_visible_annotations,
1910 runtime_visible_annotations_length,
1911 runtime_invisible_annotations,
1912 runtime_invisible_annotations_length,
1913 CHECK);
1914 cm->set_method_annotations(a);
1915 }
1916
1917 if (runtime_visible_parameter_annotations_length +
1918 runtime_invisible_parameter_annotations_length > 0) {
1919 a = assemble_annotations(runtime_visible_parameter_annotations,
1920 runtime_visible_parameter_annotations_length,
1921 runtime_invisible_parameter_annotations,
1922 runtime_invisible_parameter_annotations_length,
1923 CHECK);
1924 cm->set_parameter_annotations(a);
1925 }
1926
1927 if (annotation_default_length > 0) {
1928 a = assemble_annotations(annotation_default,
1929 annotation_default_length,
1930 NULL,
1931 0,
1932 CHECK);
1933 cm->set_default_annotations(a);
1934 }
1935
1936 if (runtime_visible_type_annotations_length +
1937 runtime_invisible_type_annotations_length > 0) {
1938 a = assemble_annotations(runtime_visible_type_annotations,
1939 runtime_visible_type_annotations_length,
1940 runtime_invisible_type_annotations,
1941 runtime_invisible_type_annotations_length,
1942 CHECK);
1943 cm->set_type_annotations(a);
1944 }
1945 }
1946
1947
1948 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1949 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1950 // Method* to save footprint, so we only know the size of the resulting Method* when the
1951 // entire method attribute is parsed.
1952 //
1953 // The promoted_flags parameter is used to pass relevant access_flags
1954 // from the method back up to the containing klass. These flag values
1955 // are added to klass's access_flags.
1956
1957 methodHandle ClassFileParser::parse_method(bool is_interface,
1958 AccessFlags *promoted_flags,
1959 TRAPS) {
1960 ClassFileStream* cfs = stream();
1961 methodHandle nullHandle;
1962 ResourceMark rm(THREAD);
1963 // Parse fixed parts
1964 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1965
1966 int flags = cfs->get_u2_fast();
1967 u2 name_index = cfs->get_u2_fast();
1968 int cp_size = _cp->length();
1969 check_property(
1970 valid_symbol_at(name_index),
1971 "Illegal constant pool index %u for method name in class file %s",
1972 name_index, CHECK_(nullHandle));
1973 Symbol* name = _cp->symbol_at(name_index);
1974 verify_legal_method_name(name, CHECK_(nullHandle));
1975
1976 u2 signature_index = cfs->get_u2_fast();
1977 guarantee_property(
1978 valid_symbol_at(signature_index),
1979 "Illegal constant pool index %u for method signature in class file %s",
1980 signature_index, CHECK_(nullHandle));
1981 Symbol* signature = _cp->symbol_at(signature_index);
1982
1983 AccessFlags access_flags;
1984 if (name == vmSymbols::class_initializer_name()) {
1985 // We ignore the other access flags for a valid class initializer.
1986 // (JVM Spec 2nd ed., chapter 4.6)
1987 if (_major_version < 51) { // backward compatibility
1988 flags = JVM_ACC_STATIC;
1989 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1990 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1991 } else {
1992 // As of major_version 51, a method named <clinit> without ACC_STATIC is
1993 // just another method. So, do a normal method modifer check.
1994 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1995 }
1996 } else {
1997 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1998 }
1999
2000 int args_size = -1; // only used when _need_verify is true
2001 if (_need_verify) {
2002 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2003 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2004 if (args_size > MAX_ARGS_SIZE) {
2005 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2006 }
2007 }
2008
2009 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2010
2011 // Default values for code and exceptions attribute elements
2012 u2 max_stack = 0;
2013 u2 max_locals = 0;
2014 u4 code_length = 0;
2015 u1* code_start = 0;
2016 u2 exception_table_length = 0;
2017 u2* exception_table_start = NULL;
2018 Array<int>* exception_handlers = Universe::the_empty_int_array();
2019 u2 checked_exceptions_length = 0;
2020 u2* checked_exceptions_start = NULL;
2021 CompressedLineNumberWriteStream* linenumber_table = NULL;
2022 int linenumber_table_length = 0;
2023 int total_lvt_length = 0;
2024 u2 lvt_cnt = 0;
2025 u2 lvtt_cnt = 0;
2026 bool lvt_allocated = false;
2027 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2028 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2029 u2* localvariable_table_length = NULL;
2030 u2** localvariable_table_start = NULL;
2031 u2* localvariable_type_table_length = NULL;
2032 u2** localvariable_type_table_start = NULL;
2033 int method_parameters_length = -1;
2034 u1* method_parameters_data = NULL;
2035 bool method_parameters_seen = false;
2036 bool parsed_code_attribute = false;
2037 bool parsed_checked_exceptions_attribute = false;
2038 bool parsed_stackmap_attribute = false;
2039 // stackmap attribute - JDK1.5
2040 u1* stackmap_data = NULL;
2041 int stackmap_data_length = 0;
2042 u2 generic_signature_index = 0;
2043 MethodAnnotationCollector parsed_annotations;
2044 u1* runtime_visible_annotations = NULL;
2045 int runtime_visible_annotations_length = 0;
2046 u1* runtime_invisible_annotations = NULL;
2047 int runtime_invisible_annotations_length = 0;
2048 u1* runtime_visible_parameter_annotations = NULL;
2049 int runtime_visible_parameter_annotations_length = 0;
2050 u1* runtime_invisible_parameter_annotations = NULL;
2051 int runtime_invisible_parameter_annotations_length = 0;
2052 u1* runtime_visible_type_annotations = NULL;
2053 int runtime_visible_type_annotations_length = 0;
2054 u1* runtime_invisible_type_annotations = NULL;
2055 int runtime_invisible_type_annotations_length = 0;
2056 bool runtime_invisible_annotations_exists = false;
2057 bool runtime_invisible_type_annotations_exists = false;
2058 bool runtime_invisible_parameter_annotations_exists = false;
2059 u1* annotation_default = NULL;
2060 int annotation_default_length = 0;
2061
2062 // Parse code and exceptions attribute
2063 u2 method_attributes_count = cfs->get_u2_fast();
2064 while (method_attributes_count--) {
2065 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2066 u2 method_attribute_name_index = cfs->get_u2_fast();
2067 u4 method_attribute_length = cfs->get_u4_fast();
2068 check_property(
2069 valid_symbol_at(method_attribute_name_index),
2070 "Invalid method attribute name index %u in class file %s",
2071 method_attribute_name_index, CHECK_(nullHandle));
2072
2073 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2074 if (method_attribute_name == vmSymbols::tag_code()) {
2075 // Parse Code attribute
2076 if (_need_verify) {
2077 guarantee_property(
2078 !access_flags.is_native() && !access_flags.is_abstract(),
2079 "Code attribute in native or abstract methods in class file %s",
2080 CHECK_(nullHandle));
2081 }
2082 if (parsed_code_attribute) {
2083 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2084 }
2085 parsed_code_attribute = true;
2086
2087 // Stack size, locals size, and code size
2088 if (_major_version == 45 && _minor_version <= 2) {
2089 cfs->guarantee_more(4, CHECK_(nullHandle));
2090 max_stack = cfs->get_u1_fast();
2091 max_locals = cfs->get_u1_fast();
2092 code_length = cfs->get_u2_fast();
2093 } else {
2094 cfs->guarantee_more(8, CHECK_(nullHandle));
2095 max_stack = cfs->get_u2_fast();
2096 max_locals = cfs->get_u2_fast();
2097 code_length = cfs->get_u4_fast();
2098 }
2099 if (_need_verify) {
2100 guarantee_property(args_size <= max_locals,
2101 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2102 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2103 "Invalid method Code length %u in class file %s",
2104 code_length, CHECK_(nullHandle));
2105 }
2106 // Code pointer
2107 code_start = cfs->get_u1_buffer();
2108 assert(code_start != NULL, "null code start");
2109 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2110 cfs->skip_u1_fast(code_length);
2111
2112 // Exception handler table
2113 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2114 exception_table_length = cfs->get_u2_fast();
2115 if (exception_table_length > 0) {
2116 exception_table_start =
2117 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2118 }
2119
2120 // Parse additional attributes in code attribute
2121 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2122 u2 code_attributes_count = cfs->get_u2_fast();
2123
2124 unsigned int calculated_attribute_length = 0;
2125
2126 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2127 calculated_attribute_length =
2128 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2129 } else {
2130 // max_stack, locals and length are smaller in pre-version 45.2 classes
2131 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2132 }
2133 calculated_attribute_length +=
2134 code_length +
2135 sizeof(exception_table_length) +
2136 sizeof(code_attributes_count) +
2137 exception_table_length *
2138 ( sizeof(u2) + // start_pc
2139 sizeof(u2) + // end_pc
2140 sizeof(u2) + // handler_pc
2141 sizeof(u2) ); // catch_type_index
2142
2143 while (code_attributes_count--) {
2144 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2145 u2 code_attribute_name_index = cfs->get_u2_fast();
2146 u4 code_attribute_length = cfs->get_u4_fast();
2147 calculated_attribute_length += code_attribute_length +
2148 sizeof(code_attribute_name_index) +
2149 sizeof(code_attribute_length);
2150 check_property(valid_symbol_at(code_attribute_name_index),
2151 "Invalid code attribute name index %u in class file %s",
2152 code_attribute_name_index,
2153 CHECK_(nullHandle));
2154 if (LoadLineNumberTables &&
2155 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2156 // Parse and compress line number table
2157 parse_linenumber_table(code_attribute_length, code_length,
2158 &linenumber_table, CHECK_(nullHandle));
2159
2160 } else if (LoadLocalVariableTables &&
2161 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2162 // Parse local variable table
2163 if (!lvt_allocated) {
2164 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2165 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2166 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2167 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2168 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2169 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2170 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2171 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2172 lvt_allocated = true;
2173 }
2174 if (lvt_cnt == max_lvt_cnt) {
2175 max_lvt_cnt <<= 1;
2176 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2177 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2178 }
2179 localvariable_table_start[lvt_cnt] =
2180 parse_localvariable_table(code_length,
2181 max_locals,
2182 code_attribute_length,
2183 &localvariable_table_length[lvt_cnt],
2184 false, // is not LVTT
2185 CHECK_(nullHandle));
2186 total_lvt_length += localvariable_table_length[lvt_cnt];
2187 lvt_cnt++;
2188 } else if (LoadLocalVariableTypeTables &&
2189 _major_version >= JAVA_1_5_VERSION &&
2190 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2191 if (!lvt_allocated) {
2192 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2193 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2194 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2195 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2196 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2197 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2198 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2199 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2200 lvt_allocated = true;
2201 }
2202 // Parse local variable type table
2203 if (lvtt_cnt == max_lvtt_cnt) {
2204 max_lvtt_cnt <<= 1;
2205 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2206 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2207 }
2208 localvariable_type_table_start[lvtt_cnt] =
2209 parse_localvariable_table(code_length,
2210 max_locals,
2211 code_attribute_length,
2212 &localvariable_type_table_length[lvtt_cnt],
2213 true, // is LVTT
2214 CHECK_(nullHandle));
2215 lvtt_cnt++;
2216 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2217 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2218 // Stack map is only needed by the new verifier in JDK1.5.
2219 if (parsed_stackmap_attribute) {
2220 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2221 }
2222 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2223 stackmap_data_length = code_attribute_length;
2224 parsed_stackmap_attribute = true;
2225 } else {
2226 // Skip unknown attributes
2227 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2228 }
2229 }
2230 // check method attribute length
2231 if (_need_verify) {
2232 guarantee_property(method_attribute_length == calculated_attribute_length,
2233 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2234 }
2235 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2236 // Parse Exceptions attribute
2237 if (parsed_checked_exceptions_attribute) {
2238 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2239 }
2240 parsed_checked_exceptions_attribute = true;
2241 checked_exceptions_start =
2242 parse_checked_exceptions(&checked_exceptions_length,
2243 method_attribute_length,
2244 CHECK_(nullHandle));
2245 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2246 // reject multiple method parameters
2247 if (method_parameters_seen) {
2248 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2249 }
2250 method_parameters_seen = true;
2251 method_parameters_length = cfs->get_u1_fast();
2252 const u2 real_length = (method_parameters_length * 4u) + 1u;
2253 if (method_attribute_length != real_length) {
2254 classfile_parse_error(
2255 "Invalid MethodParameters method attribute length %u in class file",
2256 method_attribute_length, CHECK_(nullHandle));
2257 }
2258 method_parameters_data = cfs->get_u1_buffer();
2259 cfs->skip_u2_fast(method_parameters_length);
2260 cfs->skip_u2_fast(method_parameters_length);
2261 // ignore this attribute if it cannot be reflected
2262 if (!SystemDictionary::Parameter_klass_loaded())
2263 method_parameters_length = -1;
2264 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2265 if (method_attribute_length != 0) {
2266 classfile_parse_error(
2267 "Invalid Synthetic method attribute length %u in class file %s",
2268 method_attribute_length, CHECK_(nullHandle));
2269 }
2270 // Should we check that there hasn't already been a synthetic attribute?
2271 access_flags.set_is_synthetic();
2272 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2273 if (method_attribute_length != 0) {
2274 classfile_parse_error(
2275 "Invalid Deprecated method attribute length %u in class file %s",
2276 method_attribute_length, CHECK_(nullHandle));
2277 }
2278 } else if (_major_version >= JAVA_1_5_VERSION) {
2279 if (method_attribute_name == vmSymbols::tag_signature()) {
2280 if (method_attribute_length != 2) {
2281 classfile_parse_error(
2282 "Invalid Signature attribute length %u in class file %s",
2283 method_attribute_length, CHECK_(nullHandle));
2284 }
2285 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2286 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2287 if (runtime_visible_annotations != NULL) {
2288 classfile_parse_error(
2289 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2290 }
2291 runtime_visible_annotations_length = method_attribute_length;
2292 runtime_visible_annotations = cfs->get_u1_buffer();
2293 assert(runtime_visible_annotations != NULL, "null visible annotations");
2294 parse_annotations(runtime_visible_annotations,
2295 runtime_visible_annotations_length, &parsed_annotations);
2296 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2297 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2298 if (runtime_invisible_annotations_exists) {
2299 classfile_parse_error(
2300 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2301 }
2302 runtime_invisible_annotations_exists = true;
2303 if (PreserveAllAnnotations) {
2304 runtime_invisible_annotations_length = method_attribute_length;
2305 runtime_invisible_annotations = cfs->get_u1_buffer();
2306 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2307 }
2308 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2309 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2310 if (runtime_visible_parameter_annotations != NULL) {
2311 classfile_parse_error(
2312 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2313 }
2314 runtime_visible_parameter_annotations_length = method_attribute_length;
2315 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2316 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2317 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2318 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2319 if (runtime_invisible_parameter_annotations_exists) {
2320 classfile_parse_error(
2321 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2322 }
2323 runtime_invisible_parameter_annotations_exists = true;
2324 if (PreserveAllAnnotations) {
2325 runtime_invisible_parameter_annotations_length = method_attribute_length;
2326 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2327 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2328 }
2329 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2330 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2331 if (annotation_default != NULL) {
2332 classfile_parse_error(
2333 "Multiple AnnotationDefault attributes for method in class file %s",
2334 CHECK_(nullHandle));
2335 }
2336 annotation_default_length = method_attribute_length;
2337 annotation_default = cfs->get_u1_buffer();
2338 assert(annotation_default != NULL, "null annotation default");
2339 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2340 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2341 if (runtime_visible_type_annotations != NULL) {
2342 classfile_parse_error(
2343 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2344 CHECK_(nullHandle));
2345 }
2346 runtime_visible_type_annotations_length = method_attribute_length;
2347 runtime_visible_type_annotations = cfs->get_u1_buffer();
2348 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2349 // No need for the VM to parse Type annotations
2350 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2351 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2352 if (runtime_invisible_type_annotations_exists) {
2353 classfile_parse_error(
2354 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2355 CHECK_(nullHandle));
2356 } else {
2357 runtime_invisible_type_annotations_exists = true;
2358 }
2359 if (PreserveAllAnnotations) {
2360 runtime_invisible_type_annotations_length = method_attribute_length;
2361 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2362 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2363 }
2364 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2365 } else {
2366 // Skip unknown attributes
2367 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2368 }
2369 } else {
2370 // Skip unknown attributes
2371 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2372 }
2373 }
2374
2375 if (linenumber_table != NULL) {
2376 linenumber_table->write_terminator();
2377 linenumber_table_length = linenumber_table->position();
2378 }
2379
2380 // Make sure there's at least one Code attribute in non-native/non-abstract method
2381 if (_need_verify) {
2382 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2383 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2384 }
2385
2386 // All sizing information for a Method* is finally available, now create it
2387 InlineTableSizes sizes(
2388 total_lvt_length,
2389 linenumber_table_length,
2390 exception_table_length,
2391 checked_exceptions_length,
2392 method_parameters_length,
2393 generic_signature_index,
2394 runtime_visible_annotations_length +
2395 runtime_invisible_annotations_length,
2396 runtime_visible_parameter_annotations_length +
2397 runtime_invisible_parameter_annotations_length,
2398 runtime_visible_type_annotations_length +
2399 runtime_invisible_type_annotations_length,
2400 annotation_default_length,
2401 0);
2402
2403 Method* m = Method::allocate(
2404 _loader_data, code_length, access_flags, &sizes,
2405 ConstMethod::NORMAL, CHECK_(nullHandle));
2406
2407 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2408
2409 // Fill in information from fixed part (access_flags already set)
2410 m->set_constants(_cp);
2411 m->set_name_index(name_index);
2412 m->set_signature_index(signature_index);
2413 #ifdef CC_INTERP
2414 // hmm is there a gc issue here??
2415 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2416 m->set_result_index(rtf.type());
2417 #endif
2418
2419 if (args_size >= 0) {
2420 m->set_size_of_parameters(args_size);
2421 } else {
2422 m->compute_size_of_parameters(THREAD);
2423 }
2424 #ifdef ASSERT
2425 if (args_size >= 0) {
2426 m->compute_size_of_parameters(THREAD);
2427 assert(args_size == m->size_of_parameters(), "");
2428 }
2429 #endif
2430
2431 // Fill in code attribute information
2432 m->set_max_stack(max_stack);
2433 m->set_max_locals(max_locals);
2434 if (stackmap_data != NULL) {
2435 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2436 stackmap_data_length, CHECK_NULL);
2437 }
2438
2439 // Copy byte codes
2440 m->set_code(code_start);
2441
2442 // Copy line number table
2443 if (linenumber_table != NULL) {
2444 memcpy(m->compressed_linenumber_table(),
2445 linenumber_table->buffer(), linenumber_table_length);
2446 }
2447
2448 // Copy exception table
2449 if (exception_table_length > 0) {
2450 int size =
2451 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2452 copy_u2_with_conversion((u2*) m->exception_table_start(),
2453 exception_table_start, size);
2454 }
2455
2456 // Copy method parameters
2457 if (method_parameters_length > 0) {
2458 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2459 for (int i = 0; i < method_parameters_length; i++) {
2460 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2461 method_parameters_data += 2;
2462 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2463 method_parameters_data += 2;
2464 }
2465 }
2466
2467 // Copy checked exceptions
2468 if (checked_exceptions_length > 0) {
2469 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2470 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2471 }
2472
2473 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2474 if (total_lvt_length > 0) {
2475 promoted_flags->set_has_localvariable_table();
2476 copy_localvariable_table(m->constMethod(), lvt_cnt,
2477 localvariable_table_length,
2478 localvariable_table_start,
2479 lvtt_cnt,
2480 localvariable_type_table_length,
2481 localvariable_type_table_start, CHECK_NULL);
2482 }
2483
2484 if (parsed_annotations.has_any_annotations())
2485 parsed_annotations.apply_to(m);
2486
2487 // Copy annotations
2488 copy_method_annotations(m->constMethod(),
2489 runtime_visible_annotations,
2490 runtime_visible_annotations_length,
2491 runtime_invisible_annotations,
2492 runtime_invisible_annotations_length,
2493 runtime_visible_parameter_annotations,
2494 runtime_visible_parameter_annotations_length,
2495 runtime_invisible_parameter_annotations,
2496 runtime_invisible_parameter_annotations_length,
2497 runtime_visible_type_annotations,
2498 runtime_visible_type_annotations_length,
2499 runtime_invisible_type_annotations,
2500 runtime_invisible_type_annotations_length,
2501 annotation_default,
2502 annotation_default_length,
2503 CHECK_NULL);
2504
2505 if (name == vmSymbols::finalize_method_name() &&
2506 signature == vmSymbols::void_method_signature()) {
2507 if (m->is_empty_method()) {
2508 _has_empty_finalizer = true;
2509 } else {
2510 _has_finalizer = true;
2511 }
2512 }
2513 if (name == vmSymbols::object_initializer_name() &&
2514 signature == vmSymbols::void_method_signature() &&
2515 m->is_vanilla_constructor()) {
2516 _has_vanilla_constructor = true;
2517 }
2518
2519 NOT_PRODUCT(m->verify());
2520 return m;
2521 }
2522
2523
2524 // The promoted_flags parameter is used to pass relevant access_flags
2525 // from the methods back up to the containing klass. These flag values
2526 // are added to klass's access_flags.
2527
2528 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2529 AccessFlags* promoted_flags,
2530 bool* has_final_method,
2531 bool* declares_default_methods,
2532 TRAPS) {
2533 ClassFileStream* cfs = stream();
2534 cfs->guarantee_more(2, CHECK_NULL); // length
2535 u2 length = cfs->get_u2_fast();
2536 if (length == 0) {
2537 _methods = Universe::the_empty_method_array();
2538 } else {
2539 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2540
2541 HandleMark hm(THREAD);
2542 for (int index = 0; index < length; index++) {
2543 methodHandle method = parse_method(is_interface,
2544 promoted_flags,
2545 CHECK_NULL);
2546
2547 if (method->is_final()) {
2548 *has_final_method = true;
2549 }
2550 // declares_default_methods: declares concrete instance methods, any access flags
2551 // used for interface initialization, and default method inheritance analysis
2552 if (is_interface && !(*declares_default_methods)
2553 && !method->is_abstract() && !method->is_static()) {
2554 *declares_default_methods = true;
2555 }
2556 _methods->at_put(index, method());
2557 }
2558
2559 if (_need_verify && length > 1) {
2560 // Check duplicated methods
2561 ResourceMark rm(THREAD);
2562 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2563 THREAD, NameSigHash*, HASH_ROW_SIZE);
2564 initialize_hashtable(names_and_sigs);
2565 bool dup = false;
2566 {
2567 debug_only(No_Safepoint_Verifier nsv;)
2568 for (int i = 0; i < length; i++) {
2569 Method* m = _methods->at(i);
2570 // If no duplicates, add name/signature in hashtable names_and_sigs.
2571 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2572 dup = true;
2573 break;
2574 }
2575 }
2576 }
2577 if (dup) {
2578 classfile_parse_error("Duplicate method name&signature in class file %s",
2579 CHECK_NULL);
2580 }
2581 }
2582 }
2583 return _methods;
2584 }
2585
2586
2587 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2588 int length = methods->length();
2589 // If JVMTI original method ordering or sharing is enabled we have to
2590 // remember the original class file ordering.
2591 // We temporarily use the vtable_index field in the Method* to store the
2592 // class file index, so we can read in after calling qsort.
2593 // Put the method ordering in the shared archive.
2594 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2595 for (int index = 0; index < length; index++) {
2596 Method* m = methods->at(index);
2597 assert(!m->valid_vtable_index(), "vtable index should not be set");
2598 m->set_vtable_index(index);
2599 }
2600 }
2601 // Sort method array by ascending method name (for faster lookups & vtable construction)
2602 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2603 Method::sort_methods(methods);
2604
2605 intArray* method_ordering = NULL;
2606 // If JVMTI original method ordering or sharing is enabled construct int
2607 // array remembering the original ordering
2608 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2609 method_ordering = new intArray(length);
2610 for (int index = 0; index < length; index++) {
2611 Method* m = methods->at(index);
2612 int old_index = m->vtable_index();
2613 assert(old_index >= 0 && old_index < length, "invalid method index");
2614 method_ordering->at_put(index, old_index);
2615 m->set_vtable_index(Method::invalid_vtable_index);
2616 }
2617 }
2618 return method_ordering;
2619 }
2620
2621 // Parse generic_signature attribute for methods and fields
2622 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2623 ClassFileStream* cfs = stream();
2624 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2625 u2 generic_signature_index = cfs->get_u2_fast();
2626 check_property(
2627 valid_symbol_at(generic_signature_index),
2628 "Invalid Signature attribute at constant pool index %u in class file %s",
2629 generic_signature_index, CHECK_0);
2630 return generic_signature_index;
2631 }
2632
2633 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2634 ClassFileStream* cfs = stream();
2635 cfs->guarantee_more(2, CHECK); // sourcefile_index
2636 u2 sourcefile_index = cfs->get_u2_fast();
2637 check_property(
2638 valid_symbol_at(sourcefile_index),
2639 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2640 sourcefile_index, CHECK);
2641 set_class_sourcefile_index(sourcefile_index);
2642 }
2643
2644
2645
2646 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2647 ClassFileStream* cfs = stream();
2648 u1* sde_buffer = cfs->get_u1_buffer();
2649 assert(sde_buffer != NULL, "null sde buffer");
2650
2651 // Don't bother storing it if there is no way to retrieve it
2652 if (JvmtiExport::can_get_source_debug_extension()) {
2653 assert((length+1) > length, "Overflow checking");
2654 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2655 for (int i = 0; i < length; i++) {
2656 sde[i] = sde_buffer[i];
2657 }
2658 sde[length] = '\0';
2659 set_class_sde_buffer((char*)sde, length);
2660 }
2661 // Got utf8 string, set stream position forward
2662 cfs->skip_u1(length, CHECK);
2663 }
2664
2665
2666 // Inner classes can be static, private or protected (classic VM does this)
2667 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2668
2669 // Return number of classes in the inner classes attribute table
2670 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2671 bool parsed_enclosingmethod_attribute,
2672 u2 enclosing_method_class_index,
2673 u2 enclosing_method_method_index,
2674 TRAPS) {
2675 ClassFileStream* cfs = stream();
2676 u1* current_mark = cfs->current();
2677 u2 length = 0;
2678 if (inner_classes_attribute_start != NULL) {
2679 cfs->set_current(inner_classes_attribute_start);
2680 cfs->guarantee_more(2, CHECK_0); // length
2681 length = cfs->get_u2_fast();
2682 }
2683
2684 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2685 // method data:
2686 // [inner_class_info_index,
2687 // outer_class_info_index,
2688 // inner_name_index,
2689 // inner_class_access_flags,
2690 // ...
2691 // enclosing_method_class_index,
2692 // enclosing_method_method_index]
2693 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2694 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2695 _inner_classes = inner_classes;
2696
2697 int index = 0;
2698 int cp_size = _cp->length();
2699 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2700 for (int n = 0; n < length; n++) {
2701 // Inner class index
2702 u2 inner_class_info_index = cfs->get_u2_fast();
2703 check_property(
2704 valid_klass_reference_at(inner_class_info_index),
2705 "inner_class_info_index %u has bad constant type in class file %s",
2706 inner_class_info_index, CHECK_0);
2707 // Outer class index
2708 u2 outer_class_info_index = cfs->get_u2_fast();
2709 check_property(
2710 outer_class_info_index == 0 ||
2711 valid_klass_reference_at(outer_class_info_index),
2712 "outer_class_info_index %u has bad constant type in class file %s",
2713 outer_class_info_index, CHECK_0);
2714 // Inner class name
2715 u2 inner_name_index = cfs->get_u2_fast();
2716 check_property(
2717 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2718 "inner_name_index %u has bad constant type in class file %s",
2719 inner_name_index, CHECK_0);
2720 if (_need_verify) {
2721 guarantee_property(inner_class_info_index != outer_class_info_index,
2722 "Class is both outer and inner class in class file %s", CHECK_0);
2723 }
2724 // Access flags
2725 AccessFlags inner_access_flags;
2726 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2727 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2728 // Set abstract bit for old class files for backward compatibility
2729 flags |= JVM_ACC_ABSTRACT;
2730 }
2731 verify_legal_class_modifiers(flags, CHECK_0);
2732 inner_access_flags.set_flags(flags);
2733
2734 inner_classes->at_put(index++, inner_class_info_index);
2735 inner_classes->at_put(index++, outer_class_info_index);
2736 inner_classes->at_put(index++, inner_name_index);
2737 inner_classes->at_put(index++, inner_access_flags.as_short());
2738 }
2739
2740 // 4347400: make sure there's no duplicate entry in the classes array
2741 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2742 for(int i = 0; i < length * 4; i += 4) {
2743 for(int j = i + 4; j < length * 4; j += 4) {
2744 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2745 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2746 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2747 inner_classes->at(i+3) != inner_classes->at(j+3)),
2748 "Duplicate entry in InnerClasses in class file %s",
2749 CHECK_0);
2750 }
2751 }
2752 }
2753
2754 // Set EnclosingMethod class and method indexes.
2755 if (parsed_enclosingmethod_attribute) {
2756 inner_classes->at_put(index++, enclosing_method_class_index);
2757 inner_classes->at_put(index++, enclosing_method_method_index);
2758 }
2759 assert(index == size, "wrong size");
2760
2761 // Restore buffer's current position.
2762 cfs->set_current(current_mark);
2763
2764 return length;
2765 }
2766
2767 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2768 set_class_synthetic_flag(true);
2769 }
2770
2771 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2772 ClassFileStream* cfs = stream();
2773 u2 signature_index = cfs->get_u2(CHECK);
2774 check_property(
2775 valid_symbol_at(signature_index),
2776 "Invalid constant pool index %u in Signature attribute in class file %s",
2777 signature_index, CHECK);
2778 set_class_generic_signature_index(signature_index);
2779 }
2780
2781 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2782 ClassFileStream* cfs = stream();
2783 u1* current_start = cfs->current();
2784
2785 guarantee_property(attribute_byte_length >= sizeof(u2),
2786 "Invalid BootstrapMethods attribute length %u in class file %s",
2787 attribute_byte_length,
2788 CHECK);
2789
2790 cfs->guarantee_more(attribute_byte_length, CHECK);
2791
2792 int attribute_array_length = cfs->get_u2_fast();
2793
2794 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2795 "Short length on BootstrapMethods in class file %s",
2796 CHECK);
2797
2798
2799 // The attribute contains a counted array of counted tuples of shorts,
2800 // represending bootstrap specifiers:
2801 // length*{bootstrap_method_index, argument_count*{argument_index}}
2802 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2803 // operand_count = number of shorts in attr, except for leading length
2804
2805 // The attribute is copied into a short[] array.
2806 // The array begins with a series of short[2] pairs, one for each tuple.
2807 int index_size = (attribute_array_length * 2);
2808
2809 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2810
2811 // Eagerly assign operands so they will be deallocated with the constant
2812 // pool if there is an error.
2813 _cp->set_operands(operands);
2814
2815 int operand_fill_index = index_size;
2816 int cp_size = _cp->length();
2817
2818 for (int n = 0; n < attribute_array_length; n++) {
2819 // Store a 32-bit offset into the header of the operand array.
2820 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2821
2822 // Read a bootstrap specifier.
2823 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2824 u2 bootstrap_method_index = cfs->get_u2_fast();
2825 u2 argument_count = cfs->get_u2_fast();
2826 check_property(
2827 valid_cp_range(bootstrap_method_index, cp_size) &&
2828 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2829 "bootstrap_method_index %u has bad constant type in class file %s",
2830 bootstrap_method_index,
2831 CHECK);
2832
2833 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2834 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2835 CHECK);
2836
2837 operands->at_put(operand_fill_index++, bootstrap_method_index);
2838 operands->at_put(operand_fill_index++, argument_count);
2839
2840 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2841 for (int j = 0; j < argument_count; j++) {
2842 u2 argument_index = cfs->get_u2_fast();
2843 check_property(
2844 valid_cp_range(argument_index, cp_size) &&
2845 _cp->tag_at(argument_index).is_loadable_constant(),
2846 "argument_index %u has bad constant type in class file %s",
2847 argument_index,
2848 CHECK);
2849 operands->at_put(operand_fill_index++, argument_index);
2850 }
2851 }
2852
2853 u1* current_end = cfs->current();
2854 guarantee_property(current_end == current_start + attribute_byte_length,
2855 "Bad length on BootstrapMethods in class file %s",
2856 CHECK);
2857 }
2858
2859 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2860 TRAPS) {
2861 ClassFileStream* cfs = stream();
2862 // Set inner classes attribute to default sentinel
2863 _inner_classes = Universe::the_empty_short_array();
2864 cfs->guarantee_more(2, CHECK); // attributes_count
2865 u2 attributes_count = cfs->get_u2_fast();
2866 bool parsed_sourcefile_attribute = false;
2867 bool parsed_innerclasses_attribute = false;
2868 bool parsed_enclosingmethod_attribute = false;
2869 bool parsed_bootstrap_methods_attribute = false;
2870 u1* runtime_visible_annotations = NULL;
2871 int runtime_visible_annotations_length = 0;
2872 u1* runtime_invisible_annotations = NULL;
2873 int runtime_invisible_annotations_length = 0;
2874 u1* runtime_visible_type_annotations = NULL;
2875 int runtime_visible_type_annotations_length = 0;
2876 u1* runtime_invisible_type_annotations = NULL;
2877 int runtime_invisible_type_annotations_length = 0;
2878 bool runtime_invisible_type_annotations_exists = false;
2879 bool runtime_invisible_annotations_exists = false;
2880 bool parsed_source_debug_ext_annotations_exist = false;
2881 u1* inner_classes_attribute_start = NULL;
2882 u4 inner_classes_attribute_length = 0;
2883 u2 enclosing_method_class_index = 0;
2884 u2 enclosing_method_method_index = 0;
2885 // Iterate over attributes
2886 while (attributes_count--) {
2887 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2888 u2 attribute_name_index = cfs->get_u2_fast();
2889 u4 attribute_length = cfs->get_u4_fast();
2890 check_property(
2891 valid_symbol_at(attribute_name_index),
2892 "Attribute name has bad constant pool index %u in class file %s",
2893 attribute_name_index, CHECK);
2894 Symbol* tag = _cp->symbol_at(attribute_name_index);
2895 if (tag == vmSymbols::tag_source_file()) {
2896 // Check for SourceFile tag
2897 if (_need_verify) {
2898 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2899 }
2900 if (parsed_sourcefile_attribute) {
2901 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2902 } else {
2903 parsed_sourcefile_attribute = true;
2904 }
2905 parse_classfile_sourcefile_attribute(CHECK);
2906 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2907 // Check for SourceDebugExtension tag
2908 if (parsed_source_debug_ext_annotations_exist) {
2909 classfile_parse_error(
2910 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2911 }
2912 parsed_source_debug_ext_annotations_exist = true;
2913 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2914 } else if (tag == vmSymbols::tag_inner_classes()) {
2915 // Check for InnerClasses tag
2916 if (parsed_innerclasses_attribute) {
2917 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2918 } else {
2919 parsed_innerclasses_attribute = true;
2920 }
2921 inner_classes_attribute_start = cfs->get_u1_buffer();
2922 inner_classes_attribute_length = attribute_length;
2923 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2924 } else if (tag == vmSymbols::tag_synthetic()) {
2925 // Check for Synthetic tag
2926 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2927 if (attribute_length != 0) {
2928 classfile_parse_error(
2929 "Invalid Synthetic classfile attribute length %u in class file %s",
2930 attribute_length, CHECK);
2931 }
2932 parse_classfile_synthetic_attribute(CHECK);
2933 } else if (tag == vmSymbols::tag_deprecated()) {
2934 // Check for Deprecatd tag - 4276120
2935 if (attribute_length != 0) {
2936 classfile_parse_error(
2937 "Invalid Deprecated classfile attribute length %u in class file %s",
2938 attribute_length, CHECK);
2939 }
2940 } else if (_major_version >= JAVA_1_5_VERSION) {
2941 if (tag == vmSymbols::tag_signature()) {
2942 if (attribute_length != 2) {
2943 classfile_parse_error(
2944 "Wrong Signature attribute length %u in class file %s",
2945 attribute_length, CHECK);
2946 }
2947 parse_classfile_signature_attribute(CHECK);
2948 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2949 if (runtime_visible_annotations != NULL) {
2950 classfile_parse_error(
2951 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2952 }
2953 runtime_visible_annotations_length = attribute_length;
2954 runtime_visible_annotations = cfs->get_u1_buffer();
2955 assert(runtime_visible_annotations != NULL, "null visible annotations");
2956 parse_annotations(runtime_visible_annotations,
2957 runtime_visible_annotations_length,
2958 parsed_annotations);
2959 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2960 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2961 if (runtime_invisible_annotations_exists) {
2962 classfile_parse_error(
2963 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2964 }
2965 runtime_invisible_annotations_exists = true;
2966 if (PreserveAllAnnotations) {
2967 runtime_invisible_annotations_length = attribute_length;
2968 runtime_invisible_annotations = cfs->get_u1_buffer();
2969 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2970 }
2971 cfs->skip_u1(attribute_length, CHECK);
2972 } else if (tag == vmSymbols::tag_enclosing_method()) {
2973 if (parsed_enclosingmethod_attribute) {
2974 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2975 } else {
2976 parsed_enclosingmethod_attribute = true;
2977 }
2978 guarantee_property(attribute_length == 4,
2979 "Wrong EnclosingMethod attribute length %u in class file %s",
2980 attribute_length, CHECK);
2981 cfs->guarantee_more(4, CHECK); // class_index, method_index
2982 enclosing_method_class_index = cfs->get_u2_fast();
2983 enclosing_method_method_index = cfs->get_u2_fast();
2984 if (enclosing_method_class_index == 0) {
2985 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2986 }
2987 // Validate the constant pool indices and types
2988 check_property(valid_klass_reference_at(enclosing_method_class_index),
2989 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2990 if (enclosing_method_method_index != 0 &&
2991 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2992 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2993 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2994 }
2995 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2996 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2997 if (parsed_bootstrap_methods_attribute)
2998 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2999 parsed_bootstrap_methods_attribute = true;
3000 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3001 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3002 if (runtime_visible_type_annotations != NULL) {
3003 classfile_parse_error(
3004 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3005 }
3006 runtime_visible_type_annotations_length = attribute_length;
3007 runtime_visible_type_annotations = cfs->get_u1_buffer();
3008 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3009 // No need for the VM to parse Type annotations
3010 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3011 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3012 if (runtime_invisible_type_annotations_exists) {
3013 classfile_parse_error(
3014 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3015 } else {
3016 runtime_invisible_type_annotations_exists = true;
3017 }
3018 if (PreserveAllAnnotations) {
3019 runtime_invisible_type_annotations_length = attribute_length;
3020 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3021 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3022 }
3023 cfs->skip_u1(attribute_length, CHECK);
3024 } else {
3025 // Unknown attribute
3026 cfs->skip_u1(attribute_length, CHECK);
3027 }
3028 } else {
3029 // Unknown attribute
3030 cfs->skip_u1(attribute_length, CHECK);
3031 }
3032 }
3033 _annotations = assemble_annotations(runtime_visible_annotations,
3034 runtime_visible_annotations_length,
3035 runtime_invisible_annotations,
3036 runtime_invisible_annotations_length,
3037 CHECK);
3038 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3039 runtime_visible_type_annotations_length,
3040 runtime_invisible_type_annotations,
3041 runtime_invisible_type_annotations_length,
3042 CHECK);
3043
3044 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3045 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3046 inner_classes_attribute_start,
3047 parsed_innerclasses_attribute,
3048 enclosing_method_class_index,
3049 enclosing_method_method_index,
3050 CHECK);
3051 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3052 guarantee_property(
3053 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3054 "Wrong InnerClasses attribute length in class file %s", CHECK);
3055 }
3056 }
3057
3058 if (_max_bootstrap_specifier_index >= 0) {
3059 guarantee_property(parsed_bootstrap_methods_attribute,
3060 "Missing BootstrapMethods attribute in class file %s", CHECK);
3061 }
3062 }
3063
3064 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3065 if (_synthetic_flag)
3066 k->set_is_synthetic();
3067 if (_sourcefile_index != 0) {
3068 k->set_source_file_name_index(_sourcefile_index);
3069 }
3070 if (_generic_signature_index != 0) {
3071 k->set_generic_signature_index(_generic_signature_index);
3072 }
3073 if (_sde_buffer != NULL) {
3074 k->set_source_debug_extension(_sde_buffer, _sde_length);
3075 }
3076 }
3077
3078 // Create the Annotations object that will
3079 // hold the annotations array for the Klass.
3080 void ClassFileParser::create_combined_annotations(TRAPS) {
3081 if (_annotations == NULL &&
3082 _type_annotations == NULL &&
3083 _fields_annotations == NULL &&
3084 _fields_type_annotations == NULL) {
3085 // Don't create the Annotations object unnecessarily.
3086 return;
3087 }
3088
3089 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3090 annotations->set_class_annotations(_annotations);
3091 annotations->set_class_type_annotations(_type_annotations);
3092 annotations->set_fields_annotations(_fields_annotations);
3093 annotations->set_fields_type_annotations(_fields_type_annotations);
3094
3095 // This is the Annotations object that will be
3096 // assigned to InstanceKlass being constructed.
3097 _combined_annotations = annotations;
3098
3099 // The annotations arrays below has been transfered the
3100 // _combined_annotations so these fields can now be cleared.
3101 _annotations = NULL;
3102 _type_annotations = NULL;
3103 _fields_annotations = NULL;
3104 _fields_type_annotations = NULL;
3105 }
3106
3107 // Transfer ownership of metadata allocated to the InstanceKlass.
3108 void ClassFileParser::apply_parsed_class_metadata(
3109 instanceKlassHandle this_klass,
3110 int java_fields_count, TRAPS) {
3111 _cp->set_pool_holder(this_klass());
3112 this_klass->set_constants(_cp);
3113 this_klass->set_fields(_fields, java_fields_count);
3114 this_klass->set_methods(_methods);
3115 this_klass->set_inner_classes(_inner_classes);
3116 this_klass->set_local_interfaces(_local_interfaces);
3117 this_klass->set_transitive_interfaces(_transitive_interfaces);
3118 this_klass->set_annotations(_combined_annotations);
3119
3120 // Clear out these fields so they don't get deallocated by the destructor
3121 clear_class_metadata();
3122 }
3123
3124 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3125 int runtime_visible_annotations_length,
3126 u1* runtime_invisible_annotations,
3127 int runtime_invisible_annotations_length, TRAPS) {
3128 AnnotationArray* annotations = NULL;
3129 if (runtime_visible_annotations != NULL ||
3130 runtime_invisible_annotations != NULL) {
3131 annotations = MetadataFactory::new_array<u1>(_loader_data,
3132 runtime_visible_annotations_length +
3133 runtime_invisible_annotations_length,
3134 CHECK_(annotations));
3135 if (runtime_visible_annotations != NULL) {
3136 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3137 annotations->at_put(i, runtime_visible_annotations[i]);
3138 }
3139 }
3140 if (runtime_invisible_annotations != NULL) {
3141 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3142 int append = runtime_visible_annotations_length+i;
3143 annotations->at_put(append, runtime_invisible_annotations[i]);
3144 }
3145 }
3146 }
3147 return annotations;
3148 }
3149
3150 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3151 TRAPS) {
3152 instanceKlassHandle super_klass;
3153 if (super_class_index == 0) {
3154 check_property(_class_name == vmSymbols::java_lang_Object(),
3155 "Invalid superclass index %u in class file %s",
3156 super_class_index,
3157 CHECK_NULL);
3158 } else {
3159 check_property(valid_klass_reference_at(super_class_index),
3160 "Invalid superclass index %u in class file %s",
3161 super_class_index,
3162 CHECK_NULL);
3163 // The class name should be legal because it is checked when parsing constant pool.
3164 // However, make sure it is not an array type.
3165 bool is_array = false;
3166 if (_cp->tag_at(super_class_index).is_klass()) {
3167 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3168 if (_need_verify)
3169 is_array = super_klass->oop_is_array();
3170 } else if (_need_verify) {
3171 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3172 }
3173 if (_need_verify) {
3174 guarantee_property(!is_array,
3175 "Bad superclass name in class file %s", CHECK_NULL);
3176 }
3177 }
3178 return super_klass;
3179 }
3180
3181
3182 // Values needed for oopmap and InstanceKlass creation
3183 class FieldLayoutInfo : public StackObj {
3184 public:
3185 int* nonstatic_oop_offsets;
3186 unsigned int* nonstatic_oop_counts;
3187 unsigned int nonstatic_oop_map_count;
3188 unsigned int total_oop_map_count;
3189 int instance_size;
3190 int nonstatic_field_size;
3191 int static_field_size;
3192 bool has_nonstatic_fields;
3193 };
3194
3195 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3196 void ClassFileParser::layout_fields(Handle class_loader,
3197 FieldAllocationCount* fac,
3198 ClassAnnotationCollector* parsed_annotations,
3199 FieldLayoutInfo* info,
3200 TRAPS) {
3201
3202 // Field size and offset computation
3203 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3204 int next_static_oop_offset;
3205 int next_static_double_offset;
3206 int next_static_word_offset;
3207 int next_static_short_offset;
3208 int next_static_byte_offset;
3209 int next_nonstatic_oop_offset;
3210 int next_nonstatic_double_offset;
3211 int next_nonstatic_word_offset;
3212 int next_nonstatic_short_offset;
3213 int next_nonstatic_byte_offset;
3214 int first_nonstatic_oop_offset;
3215 int next_nonstatic_field_offset;
3216 int next_nonstatic_padded_offset;
3217
3218 // Count the contended fields by type.
3219 //
3220 // We ignore static fields, because @Contended is not supported for them.
3221 // The layout code below will also ignore the static fields.
3222 int nonstatic_contended_count = 0;
3223 FieldAllocationCount fac_contended;
3224 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3225 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3226 if (fs.is_contended()) {
3227 fac_contended.count[atype]++;
3228 if (!fs.access_flags().is_static()) {
3229 nonstatic_contended_count++;
3230 }
3231 }
3232 }
3233
3234
3235 // Calculate the starting byte offsets
3236 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3237 next_static_double_offset = next_static_oop_offset +
3238 ((fac->count[STATIC_OOP]) * heapOopSize);
3239 if ( fac->count[STATIC_DOUBLE] &&
3240 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3241 Universe::field_type_should_be_aligned(T_LONG)) ) {
3242 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3243 }
3244
3245 next_static_word_offset = next_static_double_offset +
3246 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3247 next_static_short_offset = next_static_word_offset +
3248 ((fac->count[STATIC_WORD]) * BytesPerInt);
3249 next_static_byte_offset = next_static_short_offset +
3250 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3251
3252 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3253 nonstatic_field_size * heapOopSize;
3254
3255 next_nonstatic_field_offset = nonstatic_fields_start;
3256
3257 bool is_contended_class = parsed_annotations->is_contended();
3258
3259 // Class is contended, pad before all the fields
3260 if (is_contended_class) {
3261 next_nonstatic_field_offset += ContendedPaddingWidth;
3262 }
3263
3264 // Compute the non-contended fields count.
3265 // The packing code below relies on these counts to determine if some field
3266 // can be squeezed into the alignment gap. Contended fields are obviously
3267 // exempt from that.
3268 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3269 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3270 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3271 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3272 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3273
3274 // Total non-static fields count, including every contended field
3275 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3276 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3277 fac->count[NONSTATIC_OOP];
3278
3279 bool super_has_nonstatic_fields =
3280 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3281 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3282
3283
3284 // Prepare list of oops for oop map generation.
3285 //
3286 // "offset" and "count" lists are describing the set of contiguous oop
3287 // regions. offset[i] is the start of the i-th region, which then has
3288 // count[i] oops following. Before we know how many regions are required,
3289 // we pessimistically allocate the maps to fit all the oops into the
3290 // distinct regions.
3291 //
3292 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3293 // to figure out if we still need to do this.
3294 int* nonstatic_oop_offsets;
3295 unsigned int* nonstatic_oop_counts;
3296 unsigned int nonstatic_oop_map_count = 0;
3297 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3298
3299 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3300 THREAD, int, max_nonstatic_oop_maps);
3301 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3302 THREAD, unsigned int, max_nonstatic_oop_maps);
3303
3304 first_nonstatic_oop_offset = 0; // will be set for first oop field
3305
3306 bool compact_fields = CompactFields;
3307 int allocation_style = FieldsAllocationStyle;
3308 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3309 assert(false, "0 <= FieldsAllocationStyle <= 2");
3310 allocation_style = 1; // Optimistic
3311 }
3312
3313 // The next classes have predefined hard-coded fields offsets
3314 // (see in JavaClasses::compute_hard_coded_offsets()).
3315 // Use default fields allocation order for them.
3316 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3317 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3318 _class_name == vmSymbols::java_lang_Class() ||
3319 _class_name == vmSymbols::java_lang_ClassLoader() ||
3320 _class_name == vmSymbols::java_lang_ref_Reference() ||
3321 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3322 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3323 _class_name == vmSymbols::java_lang_String() ||
3324 _class_name == vmSymbols::java_lang_Throwable() ||
3325 _class_name == vmSymbols::java_lang_Boolean() ||
3326 _class_name == vmSymbols::java_lang_Character() ||
3327 _class_name == vmSymbols::java_lang_Float() ||
3328 _class_name == vmSymbols::java_lang_Double() ||
3329 _class_name == vmSymbols::java_lang_Byte() ||
3330 _class_name == vmSymbols::java_lang_Short() ||
3331 _class_name == vmSymbols::java_lang_Integer() ||
3332 _class_name == vmSymbols::java_lang_Long())) {
3333 allocation_style = 0; // Allocate oops first
3334 compact_fields = false; // Don't compact fields
3335 }
3336
3337 // Rearrange fields for a given allocation style
3338 if( allocation_style == 0 ) {
3339 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3340 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3341 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3342 (nonstatic_oop_count * heapOopSize);
3343 } else if( allocation_style == 1 ) {
3344 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3345 next_nonstatic_double_offset = next_nonstatic_field_offset;
3346 } else if( allocation_style == 2 ) {
3347 // Fields allocation: oops fields in super and sub classes are together.
3348 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3349 _super_klass->nonstatic_oop_map_size() > 0 ) {
3350 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3351 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3352 OopMapBlock* last_map = first_map + map_count - 1;
3353 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3354 if (next_offset == next_nonstatic_field_offset) {
3355 allocation_style = 0; // allocate oops first
3356 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3357 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3358 (nonstatic_oop_count * heapOopSize);
3359 }
3360 }
3361 if( allocation_style == 2 ) {
3362 allocation_style = 1; // allocate oops last
3363 next_nonstatic_double_offset = next_nonstatic_field_offset;
3364 }
3365 } else {
3366 ShouldNotReachHere();
3367 }
3368
3369 int nonstatic_oop_space_count = 0;
3370 int nonstatic_word_space_count = 0;
3371 int nonstatic_short_space_count = 0;
3372 int nonstatic_byte_space_count = 0;
3373 int nonstatic_oop_space_offset;
3374 int nonstatic_word_space_offset;
3375 int nonstatic_short_space_offset;
3376 int nonstatic_byte_space_offset;
3377
3378 // Try to squeeze some of the fields into the gaps due to
3379 // long/double alignment.
3380 if( nonstatic_double_count > 0 ) {
3381 int offset = next_nonstatic_double_offset;
3382 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3383 if( compact_fields && offset != next_nonstatic_double_offset ) {
3384 // Allocate available fields into the gap before double field.
3385 int length = next_nonstatic_double_offset - offset;
3386 assert(length == BytesPerInt, "");
3387 nonstatic_word_space_offset = offset;
3388 if( nonstatic_word_count > 0 ) {
3389 nonstatic_word_count -= 1;
3390 nonstatic_word_space_count = 1; // Only one will fit
3391 length -= BytesPerInt;
3392 offset += BytesPerInt;
3393 }
3394 nonstatic_short_space_offset = offset;
3395 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3396 nonstatic_short_count -= 1;
3397 nonstatic_short_space_count += 1;
3398 length -= BytesPerShort;
3399 offset += BytesPerShort;
3400 }
3401 nonstatic_byte_space_offset = offset;
3402 while( length > 0 && nonstatic_byte_count > 0 ) {
3403 nonstatic_byte_count -= 1;
3404 nonstatic_byte_space_count += 1;
3405 length -= 1;
3406 }
3407 // Allocate oop field in the gap if there are no other fields for that.
3408 nonstatic_oop_space_offset = offset;
3409 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3410 allocation_style != 0 ) { // when oop fields not first
3411 nonstatic_oop_count -= 1;
3412 nonstatic_oop_space_count = 1; // Only one will fit
3413 length -= heapOopSize;
3414 offset += heapOopSize;
3415 }
3416 }
3417 }
3418
3419 next_nonstatic_word_offset = next_nonstatic_double_offset +
3420 (nonstatic_double_count * BytesPerLong);
3421 next_nonstatic_short_offset = next_nonstatic_word_offset +
3422 (nonstatic_word_count * BytesPerInt);
3423 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3424 (nonstatic_short_count * BytesPerShort);
3425 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3426 nonstatic_byte_count;
3427
3428 // let oops jump before padding with this allocation style
3429 if( allocation_style == 1 ) {
3430 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3431 if( nonstatic_oop_count > 0 ) {
3432 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3433 }
3434 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3435 }
3436
3437 // Iterate over fields again and compute correct offsets.
3438 // The field allocation type was temporarily stored in the offset slot.
3439 // oop fields are located before non-oop fields (static and non-static).
3440 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3441
3442 // skip already laid out fields
3443 if (fs.is_offset_set()) continue;
3444
3445 // contended instance fields are handled below
3446 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3447
3448 int real_offset;
3449 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3450
3451 // pack the rest of the fields
3452 switch (atype) {
3453 case STATIC_OOP:
3454 real_offset = next_static_oop_offset;
3455 next_static_oop_offset += heapOopSize;
3456 break;
3457 case STATIC_BYTE:
3458 real_offset = next_static_byte_offset;
3459 next_static_byte_offset += 1;
3460 break;
3461 case STATIC_SHORT:
3462 real_offset = next_static_short_offset;
3463 next_static_short_offset += BytesPerShort;
3464 break;
3465 case STATIC_WORD:
3466 real_offset = next_static_word_offset;
3467 next_static_word_offset += BytesPerInt;
3468 break;
3469 case STATIC_DOUBLE:
3470 real_offset = next_static_double_offset;
3471 next_static_double_offset += BytesPerLong;
3472 break;
3473 case NONSTATIC_OOP:
3474 if( nonstatic_oop_space_count > 0 ) {
3475 real_offset = nonstatic_oop_space_offset;
3476 nonstatic_oop_space_offset += heapOopSize;
3477 nonstatic_oop_space_count -= 1;
3478 } else {
3479 real_offset = next_nonstatic_oop_offset;
3480 next_nonstatic_oop_offset += heapOopSize;
3481 }
3482
3483 // Record this oop in the oop maps
3484 if( nonstatic_oop_map_count > 0 &&
3485 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3486 real_offset -
3487 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3488 heapOopSize ) {
3489 // This oop is adjacent to the previous one, add to current oop map
3490 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3491 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3492 } else {
3493 // This oop is not adjacent to the previous one, create new oop map
3494 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3495 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3496 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3497 nonstatic_oop_map_count += 1;
3498 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3499 first_nonstatic_oop_offset = real_offset;
3500 }
3501 }
3502 break;
3503 case NONSTATIC_BYTE:
3504 if( nonstatic_byte_space_count > 0 ) {
3505 real_offset = nonstatic_byte_space_offset;
3506 nonstatic_byte_space_offset += 1;
3507 nonstatic_byte_space_count -= 1;
3508 } else {
3509 real_offset = next_nonstatic_byte_offset;
3510 next_nonstatic_byte_offset += 1;
3511 }
3512 break;
3513 case NONSTATIC_SHORT:
3514 if( nonstatic_short_space_count > 0 ) {
3515 real_offset = nonstatic_short_space_offset;
3516 nonstatic_short_space_offset += BytesPerShort;
3517 nonstatic_short_space_count -= 1;
3518 } else {
3519 real_offset = next_nonstatic_short_offset;
3520 next_nonstatic_short_offset += BytesPerShort;
3521 }
3522 break;
3523 case NONSTATIC_WORD:
3524 if( nonstatic_word_space_count > 0 ) {
3525 real_offset = nonstatic_word_space_offset;
3526 nonstatic_word_space_offset += BytesPerInt;
3527 nonstatic_word_space_count -= 1;
3528 } else {
3529 real_offset = next_nonstatic_word_offset;
3530 next_nonstatic_word_offset += BytesPerInt;
3531 }
3532 break;
3533 case NONSTATIC_DOUBLE:
3534 real_offset = next_nonstatic_double_offset;
3535 next_nonstatic_double_offset += BytesPerLong;
3536 break;
3537 default:
3538 ShouldNotReachHere();
3539 }
3540 fs.set_offset(real_offset);
3541 }
3542
3543
3544 // Handle the contended cases.
3545 //
3546 // Each contended field should not intersect the cache line with another contended field.
3547 // In the absence of alignment information, we end up with pessimistically separating
3548 // the fields with full-width padding.
3549 //
3550 // Additionally, this should not break alignment for the fields, so we round the alignment up
3551 // for each field.
3552 if (nonstatic_contended_count > 0) {
3553
3554 // if there is at least one contended field, we need to have pre-padding for them
3555 next_nonstatic_padded_offset += ContendedPaddingWidth;
3556
3557 // collect all contended groups
3558 BitMap bm(_cp->size());
3559 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3560 // skip already laid out fields
3561 if (fs.is_offset_set()) continue;
3562
3563 if (fs.is_contended()) {
3564 bm.set_bit(fs.contended_group());
3565 }
3566 }
3567
3568 int current_group = -1;
3569 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3570
3571 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3572
3573 // skip already laid out fields
3574 if (fs.is_offset_set()) continue;
3575
3576 // skip non-contended fields and fields from different group
3577 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3578
3579 // handle statics below
3580 if (fs.access_flags().is_static()) continue;
3581
3582 int real_offset = 0;
3583 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3584
3585 switch (atype) {
3586 case NONSTATIC_BYTE:
3587 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3588 real_offset = next_nonstatic_padded_offset;
3589 next_nonstatic_padded_offset += 1;
3590 break;
3591
3592 case NONSTATIC_SHORT:
3593 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3594 real_offset = next_nonstatic_padded_offset;
3595 next_nonstatic_padded_offset += BytesPerShort;
3596 break;
3597
3598 case NONSTATIC_WORD:
3599 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3600 real_offset = next_nonstatic_padded_offset;
3601 next_nonstatic_padded_offset += BytesPerInt;
3602 break;
3603
3604 case NONSTATIC_DOUBLE:
3605 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3606 real_offset = next_nonstatic_padded_offset;
3607 next_nonstatic_padded_offset += BytesPerLong;
3608 break;
3609
3610 case NONSTATIC_OOP:
3611 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3612 real_offset = next_nonstatic_padded_offset;
3613 next_nonstatic_padded_offset += heapOopSize;
3614
3615 // Record this oop in the oop maps
3616 if( nonstatic_oop_map_count > 0 &&
3617 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3618 real_offset -
3619 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3620 heapOopSize ) {
3621 // This oop is adjacent to the previous one, add to current oop map
3622 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3623 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3624 } else {
3625 // This oop is not adjacent to the previous one, create new oop map
3626 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3627 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3628 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3629 nonstatic_oop_map_count += 1;
3630 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3631 first_nonstatic_oop_offset = real_offset;
3632 }
3633 }
3634 break;
3635
3636 default:
3637 ShouldNotReachHere();
3638 }
3639
3640 if (fs.contended_group() == 0) {
3641 // Contended group defines the equivalence class over the fields:
3642 // the fields within the same contended group are not inter-padded.
3643 // The only exception is default group, which does not incur the
3644 // equivalence, and so requires intra-padding.
3645 next_nonstatic_padded_offset += ContendedPaddingWidth;
3646 }
3647
3648 fs.set_offset(real_offset);
3649 } // for
3650
3651 // Start laying out the next group.
3652 // Note that this will effectively pad the last group in the back;
3653 // this is expected to alleviate memory contention effects for
3654 // subclass fields and/or adjacent object.
3655 // If this was the default group, the padding is already in place.
3656 if (current_group != 0) {
3657 next_nonstatic_padded_offset += ContendedPaddingWidth;
3658 }
3659 }
3660
3661 // handle static fields
3662 }
3663
3664 // Entire class is contended, pad in the back.
3665 // This helps to alleviate memory contention effects for subclass fields
3666 // and/or adjacent object.
3667 if (is_contended_class) {
3668 next_nonstatic_padded_offset += ContendedPaddingWidth;
3669 }
3670
3671 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3672
3673 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3674 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3675 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3676
3677 int static_field_size = (static_fields_end -
3678 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3679 nonstatic_field_size = nonstatic_field_size +
3680 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3681
3682 int instance_size = align_object_size(instance_end / wordSize);
3683
3684 assert(instance_size == align_object_size(align_size_up(
3685 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3686 wordSize) / wordSize), "consistent layout helper value");
3687
3688 // Invariant: nonstatic_field end/start should only change if there are
3689 // nonstatic fields in the class, or if the class is contended. We compare
3690 // against the non-aligned value, so that end alignment will not fail the
3691 // assert without actually having the fields.
3692 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3693 is_contended_class ||
3694 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3695
3696 // Number of non-static oop map blocks allocated at end of klass.
3697 const unsigned int total_oop_map_count =
3698 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3699 first_nonstatic_oop_offset);
3700
3701 #ifndef PRODUCT
3702 if (PrintFieldLayout) {
3703 print_field_layout(_class_name,
3704 _fields,
3705 _cp,
3706 instance_size,
3707 nonstatic_fields_start,
3708 nonstatic_fields_end,
3709 static_fields_end);
3710 }
3711
3712 #endif
3713 // Pass back information needed for InstanceKlass creation
3714 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3715 info->nonstatic_oop_counts = nonstatic_oop_counts;
3716 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3717 info->total_oop_map_count = total_oop_map_count;
3718 info->instance_size = instance_size;
3719 info->static_field_size = static_field_size;
3720 info->nonstatic_field_size = nonstatic_field_size;
3721 info->has_nonstatic_fields = has_nonstatic_fields;
3722 }
3723
3724
3725 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3726 ClassLoaderData* loader_data,
3727 Handle protection_domain,
3728 KlassHandle host_klass,
3729 GrowableArray<Handle>* cp_patches,
3730 TempNewSymbol& parsed_name,
3731 bool verify,
3732 TRAPS) {
3733
3734 // When a retransformable agent is attached, JVMTI caches the
3735 // class bytes that existed before the first retransformation.
3736 // If RedefineClasses() was used before the retransformable
3737 // agent attached, then the cached class bytes may not be the
3738 // original class bytes.
3739 JvmtiCachedClassFileData *cached_class_file = NULL;
3740 Handle class_loader(THREAD, loader_data->class_loader());
3741 bool has_default_methods = false;
3742 bool declares_default_methods = false;
3743 ResourceMark rm(THREAD);
3744
3745 ClassFileStream* cfs = stream();
3746 // Timing
3747 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3748 JavaThread* jt = (JavaThread*) THREAD;
3749
3750 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3751 ClassLoader::perf_class_parse_selftime(),
3752 NULL,
3753 jt->get_thread_stat()->perf_recursion_counts_addr(),
3754 jt->get_thread_stat()->perf_timers_addr(),
3755 PerfClassTraceTime::PARSE_CLASS);
3756
3757 init_parsed_class_attributes(loader_data);
3758
3759 if (JvmtiExport::should_post_class_file_load_hook()) {
3760 // Get the cached class file bytes (if any) from the class that
3761 // is being redefined or retransformed. We use jvmti_thread_state()
3762 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3763 // a JvmtiThreadState any earlier than necessary. This will help
3764 // avoid the bug described by 7126851.
3765 JvmtiThreadState *state = jt->jvmti_thread_state();
3766 if (state != NULL) {
3767 KlassHandle *h_class_being_redefined =
3768 state->get_class_being_redefined();
3769 if (h_class_being_redefined != NULL) {
3770 instanceKlassHandle ikh_class_being_redefined =
3771 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3772 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3773 }
3774 }
3775
3776 unsigned char* ptr = cfs->buffer();
3777 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3778
3779 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3780 &ptr, &end_ptr, &cached_class_file);
3781
3782 if (ptr != cfs->buffer()) {
3783 // JVMTI agent has modified class file data.
3784 // Set new class file stream using JVMTI agent modified
3785 // class file data.
3786 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3787 set_stream(cfs);
3788 }
3789 }
3790
3791 _host_klass = host_klass;
3792 _cp_patches = cp_patches;
3793
3794 instanceKlassHandle nullHandle;
3795
3796 // Figure out whether we can skip format checking (matching classic VM behavior)
3797 if (DumpSharedSpaces) {
3798 // verify == true means it's a 'remote' class (i.e., non-boot class)
3799 // Verification decision is based on BytecodeVerificationRemote flag
3800 // for those classes.
3801 _need_verify = (verify) ? BytecodeVerificationRemote :
3802 BytecodeVerificationLocal;
3803 } else {
3804 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3805 }
3806
3807 // Set the verify flag in stream
3808 cfs->set_verify(_need_verify);
3809
3810 // Save the class file name for easier error message printing.
3811 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3812
3813 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3814 // Magic value
3815 u4 magic = cfs->get_u4_fast();
3816 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3817 "Incompatible magic value %u in class file %s",
3818 magic, CHECK_(nullHandle));
3819
3820 // Version numbers
3821 u2 minor_version = cfs->get_u2_fast();
3822 u2 major_version = cfs->get_u2_fast();
3823
3824 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3825 ResourceMark rm;
3826 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3827 major_version, minor_version, name->as_C_string());
3828 Exceptions::fthrow(
3829 THREAD_AND_LOCATION,
3830 vmSymbols::java_lang_UnsupportedClassVersionError(),
3831 "Unsupported major.minor version for dump time %u.%u",
3832 major_version,
3833 minor_version);
3834 }
3835
3836 // Check version numbers - we check this even with verifier off
3837 if (!is_supported_version(major_version, minor_version)) {
3838 if (name == NULL) {
3839 Exceptions::fthrow(
3840 THREAD_AND_LOCATION,
3841 vmSymbols::java_lang_UnsupportedClassVersionError(),
3842 "Unsupported class file version %u.%u, "
3843 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3844 major_version,
3845 minor_version,
3846 JAVA_MAX_SUPPORTED_VERSION,
3847 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3848 } else {
3849 ResourceMark rm(THREAD);
3850 Exceptions::fthrow(
3851 THREAD_AND_LOCATION,
3852 vmSymbols::java_lang_UnsupportedClassVersionError(),
3853 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3854 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3855 name->as_C_string(),
3856 major_version,
3857 minor_version,
3858 JAVA_MAX_SUPPORTED_VERSION,
3859 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3860 }
3861 return nullHandle;
3862 }
3863
3864 _major_version = major_version;
3865 _minor_version = minor_version;
3866
3867
3868 // Check if verification needs to be relaxed for this class file
3869 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3870 _relax_verify = Verifier::relax_verify_for(class_loader());
3871
3872 // Constant pool
3873 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3874
3875 int cp_size = cp->length();
3876
3877 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3878
3879 // Access flags
3880 AccessFlags access_flags;
3881 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3882
3883 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3884 // Set abstract bit for old class files for backward compatibility
3885 flags |= JVM_ACC_ABSTRACT;
3886 }
3887 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3888 access_flags.set_flags(flags);
3889
3890 // This class and superclass
3891 u2 this_class_index = cfs->get_u2_fast();
3892 check_property(
3893 valid_cp_range(this_class_index, cp_size) &&
3894 cp->tag_at(this_class_index).is_unresolved_klass(),
3895 "Invalid this class index %u in constant pool in class file %s",
3896 this_class_index, CHECK_(nullHandle));
3897
3898 Symbol* class_name = cp->klass_name_at(this_class_index);
3899 assert(class_name != NULL, "class_name can't be null");
3900
3901 // It's important to set parsed_name *before* resolving the super class.
3902 // (it's used for cleanup by the caller if parsing fails)
3903 parsed_name = class_name;
3904 // parsed_name is returned and can be used if there's an error, so add to
3905 // its reference count. Caller will decrement the refcount.
3906 parsed_name->increment_refcount();
3907
3908 // Update _class_name which could be null previously to be class_name
3909 _class_name = class_name;
3910
3911 // Don't need to check whether this class name is legal or not.
3912 // It has been checked when constant pool is parsed.
3913 // However, make sure it is not an array type.
3914 if (_need_verify) {
3915 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3916 "Bad class name in class file %s",
3917 CHECK_(nullHandle));
3918 }
3919
3920 Klass* preserve_this_klass; // for storing result across HandleMark
3921
3922 // release all handles when parsing is done
3923 { HandleMark hm(THREAD);
3924
3925 // Checks if name in class file matches requested name
3926 if (name != NULL && class_name != name) {
3927 ResourceMark rm(THREAD);
3928 Exceptions::fthrow(
3929 THREAD_AND_LOCATION,
3930 vmSymbols::java_lang_NoClassDefFoundError(),
3931 "%s (wrong name: %s)",
3932 name->as_C_string(),
3933 class_name->as_C_string()
3934 );
3935 return nullHandle;
3936 }
3937
3938 if (TraceClassLoadingPreorder) {
3939 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3940 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3941 tty->print_cr("]");
3942 }
3943 #if INCLUDE_CDS
3944 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3945 // Only dump the classes that can be stored into CDS archive
3946 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3947 if (name != NULL) {
3948 ResourceMark rm(THREAD);
3949 classlist_file->print_cr("%s", name->as_C_string());
3950 classlist_file->flush();
3951 }
3952 }
3953 }
3954 #endif
3955
3956 u2 super_class_index = cfs->get_u2_fast();
3957 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3958 CHECK_NULL);
3959
3960 // Interfaces
3961 u2 itfs_len = cfs->get_u2_fast();
3962 Array<Klass*>* local_interfaces =
3963 parse_interfaces(itfs_len, protection_domain, _class_name,
3964 &has_default_methods, CHECK_(nullHandle));
3965
3966 u2 java_fields_count = 0;
3967 // Fields (offsets are filled in later)
3968 FieldAllocationCount fac;
3969 Array<u2>* fields = parse_fields(class_name,
3970 access_flags.is_interface(),
3971 &fac, &java_fields_count,
3972 CHECK_(nullHandle));
3973 // Methods
3974 bool has_final_method = false;
3975 AccessFlags promoted_flags;
3976 promoted_flags.set_flags(0);
3977 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3978 &promoted_flags,
3979 &has_final_method,
3980 &declares_default_methods,
3981 CHECK_(nullHandle));
3982
3983 if (declares_default_methods) {
3984 has_default_methods = true;
3985 }
3986
3987 // Additional attributes
3988 ClassAnnotationCollector parsed_annotations;
3989 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3990
3991 // Finalize the Annotations metadata object,
3992 // now that all annotation arrays have been created.
3993 create_combined_annotations(CHECK_(nullHandle));
3994
3995 // Make sure this is the end of class file stream
3996 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3997
3998 // We check super class after class file is parsed and format is checked
3999 if (super_class_index > 0 && super_klass.is_null()) {
4000 Symbol* sk = cp->klass_name_at(super_class_index);
4001 if (access_flags.is_interface()) {
4002 // Before attempting to resolve the superclass, check for class format
4003 // errors not checked yet.
4004 guarantee_property(sk == vmSymbols::java_lang_Object(),
4005 "Interfaces must have java.lang.Object as superclass in class file %s",
4006 CHECK_(nullHandle));
4007 }
4008 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4009 class_loader,
4010 protection_domain,
4011 true,
4012 CHECK_(nullHandle));
4013
4014 KlassHandle kh (THREAD, k);
4015 super_klass = instanceKlassHandle(THREAD, kh());
4016 }
4017 if (super_klass.not_null()) {
4018
4019 if (super_klass->has_default_methods()) {
4020 has_default_methods = true;
4021 }
4022
4023 if (super_klass->is_interface()) {
4024 ResourceMark rm(THREAD);
4025 Exceptions::fthrow(
4026 THREAD_AND_LOCATION,
4027 vmSymbols::java_lang_IncompatibleClassChangeError(),
4028 "class %s has interface %s as super class",
4029 class_name->as_klass_external_name(),
4030 super_klass->external_name()
4031 );
4032 return nullHandle;
4033 }
4034 // Make sure super class is not final
4035 if (super_klass->is_final()) {
4036 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4037 }
4038 }
4039
4040 // save super klass for error handling.
4041 _super_klass = super_klass;
4042
4043 // Compute the transitive list of all unique interfaces implemented by this class
4044 _transitive_interfaces =
4045 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4046
4047 // sort methods
4048 intArray* method_ordering = sort_methods(methods);
4049
4050 // promote flags from parse_methods() to the klass' flags
4051 access_flags.add_promoted_flags(promoted_flags.as_int());
4052
4053 // Size of Java vtable (in words)
4054 int vtable_size = 0;
4055 int itable_size = 0;
4056 int num_miranda_methods = 0;
4057
4058 GrowableArray<Method*> all_mirandas(20);
4059
4060 klassVtable::compute_vtable_size_and_num_mirandas(
4061 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4062 access_flags, class_loader, class_name, local_interfaces,
4063 CHECK_(nullHandle));
4064
4065 // Size of Java itable (in words)
4066 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4067
4068 FieldLayoutInfo info;
4069 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4070
4071 int total_oop_map_size2 =
4072 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4073
4074 // Compute reference type
4075 ReferenceType rt;
4076 if (super_klass() == NULL) {
4077 rt = REF_NONE;
4078 } else {
4079 rt = super_klass->reference_type();
4080 }
4081
4082 // We can now create the basic Klass* for this klass
4083 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4084 vtable_size,
4085 itable_size,
4086 info.static_field_size,
4087 total_oop_map_size2,
4088 rt,
4089 access_flags,
4090 name,
4091 super_klass(),
4092 !host_klass.is_null(),
4093 CHECK_(nullHandle));
4094 instanceKlassHandle this_klass (THREAD, _klass);
4095
4096 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4097 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4098 "sanity");
4099
4100 // Fill in information already parsed
4101 this_klass->set_should_verify_class(verify);
4102 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4103 this_klass->set_layout_helper(lh);
4104 assert(this_klass->oop_is_instance(), "layout is correct");
4105 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4106 // Not yet: supers are done below to support the new subtype-checking fields
4107 //this_klass->set_super(super_klass());
4108 this_klass->set_class_loader_data(loader_data);
4109 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4110 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4111 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4112
4113 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4114
4115 if (has_final_method) {
4116 this_klass->set_has_final_method();
4117 }
4118 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4119 // The InstanceKlass::_methods_jmethod_ids cache
4120 // is managed on the assumption that the initial cache
4121 // size is equal to the number of methods in the class. If
4122 // that changes, then InstanceKlass::idnum_can_increment()
4123 // has to be changed accordingly.
4124 this_klass->set_initial_method_idnum(methods->length());
4125 this_klass->set_name(cp->klass_name_at(this_class_index));
4126 if (is_anonymous()) // I am well known to myself
4127 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4128
4129 this_klass->set_minor_version(minor_version);
4130 this_klass->set_major_version(major_version);
4131 this_klass->set_has_default_methods(has_default_methods);
4132 this_klass->set_declares_default_methods(declares_default_methods);
4133
4134 if (!host_klass.is_null()) {
4135 assert (this_klass->is_anonymous(), "should be the same");
4136 this_klass->set_host_klass(host_klass());
4137 }
4138
4139 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4140 // (We used to do this lazily, but now we query it in Rewriter,
4141 // which is eagerly done for every method, so we might as well do it now,
4142 // when everything is fresh in memory.)
4143 vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass());
4144 if (klass_id != vmSymbols::NO_SID) {
4145 for (int j = 0; j < methods->length(); j++) {
4146 Method* method = methods->at(j);
4147 method->init_intrinsic_id();
4148
4149 if (CheckIntrinsics) {
4150 // Check if an intrinsic is defined for method 'method',
4151 // but the method is not annotated with @HotSpotIntrinsicCandidate.
4152 if (method->intrinsic_id() != vmIntrinsics::_none &&
4153 !method->intrinsic_candidate()) {
4154 tty->print("Compiler intrinsic is defined for method [%s], "
4155 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
4156 method->name_and_sig_as_C_string(),
4157 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4158 );
4159 tty->cr();
4160 DEBUG_ONLY(vm_exit(1));
4161 }
4162 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
4163 // but there is no intrinsic available for it.
4164 if (method->intrinsic_candidate() &&
4165 method->intrinsic_id() == vmIntrinsics::_none) {
4166 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
4167 "but no compiler intrinsic is defined for the method.%s",
4168 method->name_and_sig_as_C_string(),
4169 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4170 );
4171 tty->cr();
4172 DEBUG_ONLY(vm_exit(1));
4173 }
4174 }
4175 }
4176
4177 #ifdef ASSERT
4178 if (CheckIntrinsics) {
4179 // Check for orphan methods in the current class. A method m
4180 // of a class C is orphan if an intrinsic is defined for method m,
4181 // but class C does not declare m.
4182 // The check is potentially expensive, therefore it is available
4183 // only in debug builds.
4184
4185 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) {
4186 if (id == vmIntrinsics::_compiledLambdaForm) {
4187 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4188 // generated for the JVM from a LambdaForm and therefore no method
4189 // is defined for it.
4190 continue;
4191 }
4192
4193 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
4194 // Check if the current class contains a method with the same
4195 // name, flags, signature.
4196 bool match = false;
4197 for (int j = 0; j < methods->length(); j++) {
4198 Method* method = methods->at(j);
4199 if (id == method->intrinsic_id()) {
4200 match = true;
4201 break;
4202 }
4203 }
4204
4205 if (!match) {
4206 char buf[1000];
4207 tty->print("Compiler intrinsic is defined for method [%s], "
4208 "but the method is not available in class [%s].%s",
4209 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)),
4210 this_klass->name()->as_C_string(),
4211 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4212 );
4213 tty->cr();
4214 DEBUG_ONLY(vm_exit(1));
4215 }
4216 }
4217 }
4218 }
4219 #endif // ASSERT
4220 }
4221
4222
4223 if (cached_class_file != NULL) {
4224 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4225 this_klass->set_cached_class_file(cached_class_file);
4226 }
4227
4228 // Fill in field values obtained by parse_classfile_attributes
4229 if (parsed_annotations.has_any_annotations())
4230 parsed_annotations.apply_to(this_klass);
4231 apply_parsed_class_attributes(this_klass);
4232
4233 // Miranda methods
4234 if ((num_miranda_methods > 0) ||
4235 // if this class introduced new miranda methods or
4236 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4237 // super class exists and this class inherited miranda methods
4238 ) {
4239 this_klass->set_has_miranda_methods(); // then set a flag
4240 }
4241
4242 // Fill in information needed to compute superclasses.
4243 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4244
4245 // Initialize itable offset tables
4246 klassItable::setup_itable_offset_table(this_klass);
4247
4248 // Compute transitive closure of interfaces this class implements
4249 // Do final class setup
4250 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4251
4252 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4253 set_precomputed_flags(this_klass);
4254
4255 // reinitialize modifiers, using the InnerClasses attribute
4256 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4257 this_klass->set_modifier_flags(computed_modifiers);
4258
4259 // check if this class can access its super class
4260 check_super_class_access(this_klass, CHECK_(nullHandle));
4261
4262 // check if this class can access its superinterfaces
4263 check_super_interface_access(this_klass, CHECK_(nullHandle));
4264
4265 // check if this class overrides any final method
4266 check_final_method_override(this_klass, CHECK_(nullHandle));
4267
4268 // check that if this class is an interface then it doesn't have static methods
4269 if (this_klass->is_interface()) {
4270 /* An interface in a JAVA 8 classfile can be static */
4271 if (_major_version < JAVA_8_VERSION) {
4272 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4273 }
4274 }
4275
4276 // Allocate mirror and initialize static fields
4277 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4278 CHECK_(nullHandle));
4279
4280 // Generate any default methods - default methods are interface methods
4281 // that have a default implementation. This is new with Lambda project.
4282 if (has_default_methods ) {
4283 DefaultMethods::generate_default_methods(
4284 this_klass(), &all_mirandas, CHECK_(nullHandle));
4285 }
4286
4287 // Update the loader_data graph.
4288 record_defined_class_dependencies(this_klass, CHECK_NULL);
4289
4290 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4291 false /* not shared class */);
4292
4293 if (TraceClassLoading) {
4294 ResourceMark rm;
4295 // print in a single call to reduce interleaving of output
4296 if (cfs->source() != NULL) {
4297 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4298 cfs->source());
4299 } else if (class_loader.is_null()) {
4300 Klass* caller =
4301 THREAD->is_Java_thread()
4302 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4303 : NULL;
4304 // caller can be NULL, for example, during a JVMTI VM_Init hook
4305 if (caller != NULL) {
4306 tty->print("[Loaded %s by instance of %s]\n",
4307 this_klass->external_name(),
4308 InstanceKlass::cast(caller)->external_name());
4309 } else {
4310 tty->print("[Loaded %s]\n", this_klass->external_name());
4311 }
4312 } else {
4313 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4314 InstanceKlass::cast(class_loader->klass())->external_name());
4315 }
4316 }
4317
4318 if (TraceClassResolution) {
4319 ResourceMark rm;
4320 // print out the superclass.
4321 const char * from = this_klass()->external_name();
4322 if (this_klass->java_super() != NULL) {
4323 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4324 }
4325 // print out each of the interface classes referred to by this class.
4326 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4327 if (local_interfaces != NULL) {
4328 int length = local_interfaces->length();
4329 for (int i = 0; i < length; i++) {
4330 Klass* k = local_interfaces->at(i);
4331 InstanceKlass* to_class = InstanceKlass::cast(k);
4332 const char * to = to_class->external_name();
4333 tty->print("RESOLVE %s %s (interface)\n", from, to);
4334 }
4335 }
4336 }
4337
4338 // preserve result across HandleMark
4339 preserve_this_klass = this_klass();
4340 }
4341
4342 // Create new handle outside HandleMark (might be needed for
4343 // Extended Class Redefinition)
4344 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4345 debug_only(this_klass->verify();)
4346
4347 // Clear class if no error has occurred so destructor doesn't deallocate it
4348 _klass = NULL;
4349 return this_klass;
4350 }
4351
4352 // Destructor to clean up if there's an error
4353 ClassFileParser::~ClassFileParser() {
4354 MetadataFactory::free_metadata(_loader_data, _cp);
4355 MetadataFactory::free_array<u2>(_loader_data, _fields);
4356
4357 // Free methods
4358 InstanceKlass::deallocate_methods(_loader_data, _methods);
4359
4360 // beware of the Universe::empty_blah_array!!
4361 if (_inner_classes != Universe::the_empty_short_array()) {
4362 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4363 }
4364
4365 // Free interfaces
4366 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4367 _local_interfaces, _transitive_interfaces);
4368
4369 if (_combined_annotations != NULL) {
4370 // After all annotations arrays have been created, they are installed into the
4371 // Annotations object that will be assigned to the InstanceKlass being created.
4372
4373 // Deallocate the Annotations object and the installed annotations arrays.
4374 _combined_annotations->deallocate_contents(_loader_data);
4375
4376 // If the _combined_annotations pointer is non-NULL,
4377 // then the other annotations fields should have been cleared.
4378 assert(_annotations == NULL, "Should have been cleared");
4379 assert(_type_annotations == NULL, "Should have been cleared");
4380 assert(_fields_annotations == NULL, "Should have been cleared");
4381 assert(_fields_type_annotations == NULL, "Should have been cleared");
4382 } else {
4383 // If the annotations arrays were not installed into the Annotations object,
4384 // then they have to be deallocated explicitly.
4385 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4386 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4387 Annotations::free_contents(_loader_data, _fields_annotations);
4388 Annotations::free_contents(_loader_data, _fields_type_annotations);
4389 }
4390
4391 clear_class_metadata();
4392
4393 // deallocate the klass if already created. Don't directly deallocate, but add
4394 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4395 // at a safepoint.
4396 if (_klass != NULL) {
4397 _loader_data->add_to_deallocate_list(_klass);
4398 }
4399 _klass = NULL;
4400 }
4401
4402 void ClassFileParser::print_field_layout(Symbol* name,
4403 Array<u2>* fields,
4404 constantPoolHandle cp,
4405 int instance_size,
4406 int instance_fields_start,
4407 int instance_fields_end,
4408 int static_fields_end) {
4409 tty->print("%s: field layout\n", name->as_klass_external_name());
4410 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4411 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4412 if (!fs.access_flags().is_static()) {
4413 tty->print(" @%3d \"%s\" %s\n",
4414 fs.offset(),
4415 fs.name()->as_klass_external_name(),
4416 fs.signature()->as_klass_external_name());
4417 }
4418 }
4419 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4420 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4421 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4422 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4423 if (fs.access_flags().is_static()) {
4424 tty->print(" @%3d \"%s\" %s\n",
4425 fs.offset(),
4426 fs.name()->as_klass_external_name(),
4427 fs.signature()->as_klass_external_name());
4428 }
4429 }
4430 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4431 tty->print("\n");
4432 }
4433
4434 unsigned int
4435 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4436 unsigned int nonstatic_oop_map_count,
4437 int first_nonstatic_oop_offset) {
4438 unsigned int map_count =
4439 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4440 if (nonstatic_oop_map_count > 0) {
4441 // We have oops to add to map
4442 if (map_count == 0) {
4443 map_count = nonstatic_oop_map_count;
4444 } else {
4445 // Check whether we should add a new map block or whether the last one can
4446 // be extended
4447 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4448 OopMapBlock* const last_map = first_map + map_count - 1;
4449
4450 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4451 if (next_offset == first_nonstatic_oop_offset) {
4452 // There is no gap bettwen superklass's last oop field and first
4453 // local oop field, merge maps.
4454 nonstatic_oop_map_count -= 1;
4455 } else {
4456 // Superklass didn't end with a oop field, add extra maps
4457 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4458 }
4459 map_count += nonstatic_oop_map_count;
4460 }
4461 }
4462 return map_count;
4463 }
4464
4465
4466 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4467 unsigned int nonstatic_oop_map_count,
4468 int* nonstatic_oop_offsets,
4469 unsigned int* nonstatic_oop_counts) {
4470 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4471 const InstanceKlass* const super = k->superklass();
4472 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4473 if (super_count > 0) {
4474 // Copy maps from superklass
4475 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4476 for (unsigned int i = 0; i < super_count; ++i) {
4477 *this_oop_map++ = *super_oop_map++;
4478 }
4479 }
4480
4481 if (nonstatic_oop_map_count > 0) {
4482 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4483 // The counts differ because there is no gap between superklass's last oop
4484 // field and the first local oop field. Extend the last oop map copied
4485 // from the superklass instead of creating new one.
4486 nonstatic_oop_map_count--;
4487 nonstatic_oop_offsets++;
4488 this_oop_map--;
4489 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4490 this_oop_map++;
4491 }
4492
4493 // Add new map blocks, fill them
4494 while (nonstatic_oop_map_count-- > 0) {
4495 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4496 this_oop_map->set_count(*nonstatic_oop_counts++);
4497 this_oop_map++;
4498 }
4499 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4500 this_oop_map, "sanity");
4501 }
4502 }
4503
4504
4505 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4506 Klass* super = k->super();
4507
4508 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4509 // in which case we don't have to register objects as finalizable
4510 if (!_has_empty_finalizer) {
4511 if (_has_finalizer ||
4512 (super != NULL && super->has_finalizer())) {
4513 k->set_has_finalizer();
4514 }
4515 }
4516
4517 #ifdef ASSERT
4518 bool f = false;
4519 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4520 vmSymbols::void_method_signature());
4521 if (m != NULL && !m->is_empty_method()) {
4522 f = true;
4523 }
4524
4525 // Spec doesn't prevent agent from redefinition of empty finalizer.
4526 // Despite the fact that it's generally bad idea and redefined finalizer
4527 // will not work as expected we shouldn't abort vm in this case
4528 if (!k->has_redefined_this_or_super()) {
4529 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4530 }
4531 #endif
4532
4533 // Check if this klass supports the java.lang.Cloneable interface
4534 if (SystemDictionary::Cloneable_klass_loaded()) {
4535 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4536 k->set_is_cloneable();
4537 }
4538 }
4539
4540 // Check if this klass has a vanilla default constructor
4541 if (super == NULL) {
4542 // java.lang.Object has empty default constructor
4543 k->set_has_vanilla_constructor();
4544 } else {
4545 if (super->has_vanilla_constructor() &&
4546 _has_vanilla_constructor) {
4547 k->set_has_vanilla_constructor();
4548 }
4549 #ifdef ASSERT
4550 bool v = false;
4551 if (super->has_vanilla_constructor()) {
4552 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4553 ), vmSymbols::void_method_signature());
4554 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4555 v = true;
4556 }
4557 }
4558 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4559 #endif
4560 }
4561
4562 // If it cannot be fast-path allocated, set a bit in the layout helper.
4563 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4564 assert(k->size_helper() > 0, "layout_helper is initialized");
4565 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4566 || k->is_abstract() || k->is_interface()
4567 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4568 || k->size_helper() >= FastAllocateSizeLimit) {
4569 // Forbid fast-path allocation.
4570 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4571 k->set_layout_helper(lh);
4572 }
4573 }
4574
4575 // Attach super classes and interface classes to class loader data
4576 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4577 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4578 if (defining_loader_data->is_the_null_class_loader_data()) {
4579 // Dependencies to null class loader data are implicit.
4580 return;
4581 } else {
4582 // add super class dependency
4583 Klass* super = defined_klass->super();
4584 if (super != NULL) {
4585 defining_loader_data->record_dependency(super, CHECK);
4586 }
4587
4588 // add super interface dependencies
4589 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4590 if (local_interfaces != NULL) {
4591 int length = local_interfaces->length();
4592 for (int i = 0; i < length; i++) {
4593 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4594 }
4595 }
4596 }
4597 }
4598
4599 // utility methods for appending an array with check for duplicates
4600
4601 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4602 // iterate over new interfaces
4603 for (int i = 0; i < ifs->length(); i++) {
4604 Klass* e = ifs->at(i);
4605 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4606 // add new interface
4607 result->append_if_missing(e);
4608 }
4609 }
4610
4611 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4612 instanceKlassHandle super,
4613 Array<Klass*>* local_ifs, TRAPS) {
4614 // Compute maximum size for transitive interfaces
4615 int max_transitive_size = 0;
4616 int super_size = 0;
4617 // Add superclass transitive interfaces size
4618 if (super.not_null()) {
4619 super_size = super->transitive_interfaces()->length();
4620 max_transitive_size += super_size;
4621 }
4622 // Add local interfaces' super interfaces
4623 int local_size = local_ifs->length();
4624 for (int i = 0; i < local_size; i++) {
4625 Klass* l = local_ifs->at(i);
4626 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4627 }
4628 // Finally add local interfaces
4629 max_transitive_size += local_size;
4630 // Construct array
4631 if (max_transitive_size == 0) {
4632 // no interfaces, use canonicalized array
4633 return Universe::the_empty_klass_array();
4634 } else if (max_transitive_size == super_size) {
4635 // no new local interfaces added, share superklass' transitive interface array
4636 return super->transitive_interfaces();
4637 } else if (max_transitive_size == local_size) {
4638 // only local interfaces added, share local interface array
4639 return local_ifs;
4640 } else {
4641 ResourceMark rm;
4642 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4643
4644 // Copy down from superclass
4645 if (super.not_null()) {
4646 append_interfaces(result, super->transitive_interfaces());
4647 }
4648
4649 // Copy down from local interfaces' superinterfaces
4650 for (int i = 0; i < local_ifs->length(); i++) {
4651 Klass* l = local_ifs->at(i);
4652 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4653 }
4654 // Finally add local interfaces
4655 append_interfaces(result, local_ifs);
4656
4657 // length will be less than the max_transitive_size if duplicates were removed
4658 int length = result->length();
4659 assert(length <= max_transitive_size, "just checking");
4660 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4661 for (int i = 0; i < length; i++) {
4662 Klass* e = result->at(i);
4663 assert(e != NULL, "just checking");
4664 new_result->at_put(i, e);
4665 }
4666 return new_result;
4667 }
4668 }
4669
4670 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4671 Klass* super = this_klass->super();
4672 if ((super != NULL) &&
4673 (!Reflection::verify_class_access(this_klass(), super, false))) {
4674 ResourceMark rm(THREAD);
4675 Exceptions::fthrow(
4676 THREAD_AND_LOCATION,
4677 vmSymbols::java_lang_IllegalAccessError(),
4678 "class %s cannot access its superclass %s",
4679 this_klass->external_name(),
4680 InstanceKlass::cast(super)->external_name()
4681 );
4682 return;
4683 }
4684 }
4685
4686
4687 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4688 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4689 int lng = local_interfaces->length();
4690 for (int i = lng - 1; i >= 0; i--) {
4691 Klass* k = local_interfaces->at(i);
4692 assert (k != NULL && k->is_interface(), "invalid interface");
4693 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4694 ResourceMark rm(THREAD);
4695 Exceptions::fthrow(
4696 THREAD_AND_LOCATION,
4697 vmSymbols::java_lang_IllegalAccessError(),
4698 "class %s cannot access its superinterface %s",
4699 this_klass->external_name(),
4700 InstanceKlass::cast(k)->external_name()
4701 );
4702 return;
4703 }
4704 }
4705 }
4706
4707
4708 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4709 Array<Method*>* methods = this_klass->methods();
4710 int num_methods = methods->length();
4711
4712 // go thru each method and check if it overrides a final method
4713 for (int index = 0; index < num_methods; index++) {
4714 Method* m = methods->at(index);
4715
4716 // skip private, static, and <init> methods
4717 if ((!m->is_private() && !m->is_static()) &&
4718 (m->name() != vmSymbols::object_initializer_name())) {
4719
4720 Symbol* name = m->name();
4721 Symbol* signature = m->signature();
4722 Klass* k = this_klass->super();
4723 Method* super_m = NULL;
4724 while (k != NULL) {
4725 // skip supers that don't have final methods.
4726 if (k->has_final_method()) {
4727 // lookup a matching method in the super class hierarchy
4728 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4729 if (super_m == NULL) {
4730 break; // didn't find any match; get out
4731 }
4732
4733 if (super_m->is_final() && !super_m->is_static() &&
4734 // matching method in super is final, and not static
4735 (Reflection::verify_field_access(this_klass(),
4736 super_m->method_holder(),
4737 super_m->method_holder(),
4738 super_m->access_flags(), false))
4739 // this class can access super final method and therefore override
4740 ) {
4741 ResourceMark rm(THREAD);
4742 Exceptions::fthrow(
4743 THREAD_AND_LOCATION,
4744 vmSymbols::java_lang_VerifyError(),
4745 "class %s overrides final method %s.%s%s",
4746 this_klass->external_name(),
4747 super_m->method_holder()->external_name(),
4748 name->as_C_string(),
4749 signature->as_C_string()
4750 );
4751 return;
4752 }
4753
4754 // continue to look from super_m's holder's super.
4755 k = super_m->method_holder()->super();
4756 continue;
4757 }
4758
4759 k = k->super();
4760 }
4761 }
4762 }
4763 }
4764
4765
4766 // assumes that this_klass is an interface
4767 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4768 assert(this_klass->is_interface(), "not an interface");
4769 Array<Method*>* methods = this_klass->methods();
4770 int num_methods = methods->length();
4771
4772 for (int index = 0; index < num_methods; index++) {
4773 Method* m = methods->at(index);
4774 // if m is static and not the init method, throw a verify error
4775 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4776 ResourceMark rm(THREAD);
4777 Exceptions::fthrow(
4778 THREAD_AND_LOCATION,
4779 vmSymbols::java_lang_VerifyError(),
4780 "Illegal static method %s in interface %s",
4781 m->name()->as_C_string(),
4782 this_klass->external_name()
4783 );
4784 return;
4785 }
4786 }
4787 }
4788
4789 // utility methods for format checking
4790
4791 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4792 if (!_need_verify) { return; }
4793
4794 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4795 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4796 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4797 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4798 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4799 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4800 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4801
4802 if ((is_abstract && is_final) ||
4803 (is_interface && !is_abstract) ||
4804 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4805 (!is_interface && major_gte_15 && is_annotation)) {
4806 ResourceMark rm(THREAD);
4807 Exceptions::fthrow(
4808 THREAD_AND_LOCATION,
4809 vmSymbols::java_lang_ClassFormatError(),
4810 "Illegal class modifiers in class %s: 0x%X",
4811 _class_name->as_C_string(), flags
4812 );
4813 return;
4814 }
4815 }
4816
4817 bool ClassFileParser::has_illegal_visibility(jint flags) {
4818 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4819 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4820 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4821
4822 return ((is_public && is_protected) ||
4823 (is_public && is_private) ||
4824 (is_protected && is_private));
4825 }
4826
4827 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4828 u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4829 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4830 (major <= max_version) &&
4831 ((major != max_version) ||
4832 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4833 }
4834
4835 void ClassFileParser::verify_legal_field_modifiers(
4836 jint flags, bool is_interface, TRAPS) {
4837 if (!_need_verify) { return; }
4838
4839 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4840 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4841 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4842 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4843 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4844 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4845 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4846 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4847 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4848
4849 bool is_illegal = false;
4850
4851 if (is_interface) {
4852 if (!is_public || !is_static || !is_final || is_private ||
4853 is_protected || is_volatile || is_transient ||
4854 (major_gte_15 && is_enum)) {
4855 is_illegal = true;
4856 }
4857 } else { // not interface
4858 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4859 is_illegal = true;
4860 }
4861 }
4862
4863 if (is_illegal) {
4864 ResourceMark rm(THREAD);
4865 Exceptions::fthrow(
4866 THREAD_AND_LOCATION,
4867 vmSymbols::java_lang_ClassFormatError(),
4868 "Illegal field modifiers in class %s: 0x%X",
4869 _class_name->as_C_string(), flags);
4870 return;
4871 }
4872 }
4873
4874 void ClassFileParser::verify_legal_method_modifiers(
4875 jint flags, bool is_interface, Symbol* name, TRAPS) {
4876 if (!_need_verify) { return; }
4877
4878 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4879 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4880 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4881 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4882 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4883 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4884 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4885 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4886 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4887 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4888 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4889 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4890 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4891
4892 bool is_illegal = false;
4893
4894 if (is_interface) {
4895 if (major_gte_8) {
4896 // Class file version is JAVA_8_VERSION or later Methods of
4897 // interfaces may set any of the flags except ACC_PROTECTED,
4898 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4899 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4900 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4901 (is_native || is_protected || is_final || is_synchronized) ||
4902 // If a specific method of a class or interface has its
4903 // ACC_ABSTRACT flag set, it must not have any of its
4904 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4905 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4906 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4907 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4908 (is_abstract && (is_private || is_static || is_strict))) {
4909 is_illegal = true;
4910 }
4911 } else if (major_gte_15) {
4912 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4913 if (!is_public || is_static || is_final || is_synchronized ||
4914 is_native || !is_abstract || is_strict) {
4915 is_illegal = true;
4916 }
4917 } else {
4918 // Class file version is pre-JAVA_1_5_VERSION
4919 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4920 is_illegal = true;
4921 }
4922 }
4923 } else { // not interface
4924 if (has_illegal_visibility(flags)) {
4925 is_illegal = true;
4926 } else {
4927 if (is_initializer) {
4928 if (is_static || is_final || is_synchronized || is_native ||
4929 is_abstract || (major_gte_15 && is_bridge)) {
4930 is_illegal = true;
4931 }
4932 } else { // not initializer
4933 if (is_abstract) {
4934 if ((is_final || is_native || is_private || is_static ||
4935 (major_gte_15 && (is_synchronized || is_strict)))) {
4936 is_illegal = true;
4937 }
4938 }
4939 }
4940 }
4941 }
4942
4943 if (is_illegal) {
4944 ResourceMark rm(THREAD);
4945 Exceptions::fthrow(
4946 THREAD_AND_LOCATION,
4947 vmSymbols::java_lang_ClassFormatError(),
4948 "Method %s in class %s has illegal modifiers: 0x%X",
4949 name->as_C_string(), _class_name->as_C_string(), flags);
4950 return;
4951 }
4952 }
4953
4954 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4955 assert(_need_verify, "only called when _need_verify is true");
4956 int i = 0;
4957 int count = length >> 2;
4958 for (int k=0; k<count; k++) {
4959 unsigned char b0 = buffer[i];
4960 unsigned char b1 = buffer[i+1];
4961 unsigned char b2 = buffer[i+2];
4962 unsigned char b3 = buffer[i+3];
4963 // For an unsigned char v,
4964 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4965 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4966 unsigned char res = b0 | b0 - 1 |
4967 b1 | b1 - 1 |
4968 b2 | b2 - 1 |
4969 b3 | b3 - 1;
4970 if (res >= 128) break;
4971 i += 4;
4972 }
4973 for(; i < length; i++) {
4974 unsigned short c;
4975 // no embedded zeros
4976 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4977 if(buffer[i] < 128) {
4978 continue;
4979 }
4980 if ((i + 5) < length) { // see if it's legal supplementary character
4981 if (UTF8::is_supplementary_character(&buffer[i])) {
4982 c = UTF8::get_supplementary_character(&buffer[i]);
4983 i += 5;
4984 continue;
4985 }
4986 }
4987 switch (buffer[i] >> 4) {
4988 default: break;
4989 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4990 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4991 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4992 c = (buffer[i] & 0x1F) << 6;
4993 i++;
4994 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4995 c += buffer[i] & 0x3F;
4996 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4997 // for classes with major > 47, c must a null or a character in its shortest form
4998 break;
4999 }
5000 }
5001 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5002 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
5003 c = (buffer[i] & 0xF) << 12;
5004 i += 2;
5005 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
5006 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
5007 if (_major_version <= 47 || c >= 0x800) {
5008 // for classes with major > 47, c must be in its shortest form
5009 break;
5010 }
5011 }
5012 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5013 } // end of switch
5014 } // end of for
5015 }
5016
5017 // Checks if name is a legal class name.
5018 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
5019 if (!_need_verify || _relax_verify) { return; }
5020
5021 char buf[fixed_buffer_size];
5022 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5023 unsigned int length = name->utf8_length();
5024 bool legal = false;
5025
5026 if (length > 0) {
5027 char* p;
5028 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5029 p = skip_over_field_signature(bytes, false, length, CHECK);
5030 legal = (p != NULL) && ((p - bytes) == (int)length);
5031 } else if (_major_version < JAVA_1_5_VERSION) {
5032 if (bytes[0] != '<') {
5033 p = skip_over_field_name(bytes, true, length);
5034 legal = (p != NULL) && ((p - bytes) == (int)length);
5035 }
5036 } else {
5037 // 4900761: relax the constraints based on JSR202 spec
5038 // Class names may be drawn from the entire Unicode character set.
5039 // Identifiers between '/' must be unqualified names.
5040 // The utf8 string has been verified when parsing cpool entries.
5041 legal = verify_unqualified_name(bytes, length, LegalClass);
5042 }
5043 }
5044 if (!legal) {
5045 ResourceMark rm(THREAD);
5046 Exceptions::fthrow(
5047 THREAD_AND_LOCATION,
5048 vmSymbols::java_lang_ClassFormatError(),
5049 "Illegal class name \"%s\" in class file %s", bytes,
5050 _class_name->as_C_string()
5051 );
5052 return;
5053 }
5054 }
5055
5056 // Checks if name is a legal field name.
5057 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
5058 if (!_need_verify || _relax_verify) { return; }
5059
5060 char buf[fixed_buffer_size];
5061 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5062 unsigned int length = name->utf8_length();
5063 bool legal = false;
5064
5065 if (length > 0) {
5066 if (_major_version < JAVA_1_5_VERSION) {
5067 if (bytes[0] != '<') {
5068 char* p = skip_over_field_name(bytes, false, length);
5069 legal = (p != NULL) && ((p - bytes) == (int)length);
5070 }
5071 } else {
5072 // 4881221: relax the constraints based on JSR202 spec
5073 legal = verify_unqualified_name(bytes, length, LegalField);
5074 }
5075 }
5076
5077 if (!legal) {
5078 ResourceMark rm(THREAD);
5079 Exceptions::fthrow(
5080 THREAD_AND_LOCATION,
5081 vmSymbols::java_lang_ClassFormatError(),
5082 "Illegal field name \"%s\" in class %s", bytes,
5083 _class_name->as_C_string()
5084 );
5085 return;
5086 }
5087 }
5088
5089 // Checks if name is a legal method name.
5090 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5091 if (!_need_verify || _relax_verify) { return; }
5092
5093 assert(name != NULL, "method name is null");
5094 char buf[fixed_buffer_size];
5095 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5096 unsigned int length = name->utf8_length();
5097 bool legal = false;
5098
5099 if (length > 0) {
5100 if (bytes[0] == '<') {
5101 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5102 legal = true;
5103 }
5104 } else if (_major_version < JAVA_1_5_VERSION) {
5105 char* p;
5106 p = skip_over_field_name(bytes, false, length);
5107 legal = (p != NULL) && ((p - bytes) == (int)length);
5108 } else {
5109 // 4881221: relax the constraints based on JSR202 spec
5110 legal = verify_unqualified_name(bytes, length, LegalMethod);
5111 }
5112 }
5113
5114 if (!legal) {
5115 ResourceMark rm(THREAD);
5116 Exceptions::fthrow(
5117 THREAD_AND_LOCATION,
5118 vmSymbols::java_lang_ClassFormatError(),
5119 "Illegal method name \"%s\" in class %s", bytes,
5120 _class_name->as_C_string()
5121 );
5122 return;
5123 }
5124 }
5125
5126
5127 // Checks if signature is a legal field signature.
5128 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5129 if (!_need_verify) { return; }
5130
5131 char buf[fixed_buffer_size];
5132 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5133 unsigned int length = signature->utf8_length();
5134 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5135
5136 if (p == NULL || (p - bytes) != (int)length) {
5137 throwIllegalSignature("Field", name, signature, CHECK);
5138 }
5139 }
5140
5141 // Checks if signature is a legal method signature.
5142 // Returns number of parameters
5143 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5144 if (!_need_verify) {
5145 // make sure caller's args_size will be less than 0 even for non-static
5146 // method so it will be recomputed in compute_size_of_parameters().
5147 return -2;
5148 }
5149
5150 unsigned int args_size = 0;
5151 char buf[fixed_buffer_size];
5152 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5153 unsigned int length = signature->utf8_length();
5154 char* nextp;
5155
5156 // The first character must be a '('
5157 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5158 length--;
5159 // Skip over legal field signatures
5160 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5161 while ((length > 0) && (nextp != NULL)) {
5162 args_size++;
5163 if (p[0] == 'J' || p[0] == 'D') {
5164 args_size++;
5165 }
5166 length -= nextp - p;
5167 p = nextp;
5168 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5169 }
5170 // The first non-signature thing better be a ')'
5171 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5172 length--;
5173 if (name == vmSymbols::object_initializer_name()) {
5174 // All "<init>" methods must return void
5175 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5176 return args_size;
5177 }
5178 } else {
5179 // Now we better just have a return value
5180 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5181 if (nextp && ((int)length == (nextp - p))) {
5182 return args_size;
5183 }
5184 }
5185 }
5186 }
5187 // Report error
5188 throwIllegalSignature("Method", name, signature, CHECK_0);
5189 return 0;
5190 }
5191
5192
5193 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5194 // Method names also may not contain the characters '<' or '>', unless <init>
5195 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5196 // method. Because these names have been checked as special cases before
5197 // calling this method in verify_legal_method_name.
5198 bool ClassFileParser::verify_unqualified_name(
5199 char* name, unsigned int length, int type) {
5200 jchar ch;
5201
5202 for (char* p = name; p != name + length; ) {
5203 ch = *p;
5204 if (ch < 128) {
5205 p++;
5206 if (ch == '.' || ch == ';' || ch == '[' ) {
5207 return false; // do not permit '.', ';', or '['
5208 }
5209 if (type != LegalClass && ch == '/') {
5210 return false; // do not permit '/' unless it's class name
5211 }
5212 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5213 return false; // do not permit '<' or '>' in method names
5214 }
5215 } else {
5216 char* tmp_p = UTF8::next(p, &ch);
5217 p = tmp_p;
5218 }
5219 }
5220 return true;
5221 }
5222
5223
5224 // Take pointer to a string. Skip over the longest part of the string that could
5225 // be taken as a fieldname. Allow '/' if slash_ok is true.
5226 // Return a pointer to just past the fieldname.
5227 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5228 // being true, we saw consecutive slashes (meaning we were looking for a
5229 // qualified path but found something that was badly-formed).
5230 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5231 char* p;
5232 jchar ch;
5233 jboolean last_is_slash = false;
5234 jboolean not_first_ch = false;
5235
5236 for (p = name; p != name + length; not_first_ch = true) {
5237 char* old_p = p;
5238 ch = *p;
5239 if (ch < 128) {
5240 p++;
5241 // quick check for ascii
5242 if ((ch >= 'a' && ch <= 'z') ||
5243 (ch >= 'A' && ch <= 'Z') ||
5244 (ch == '_' || ch == '$') ||
5245 (not_first_ch && ch >= '0' && ch <= '9')) {
5246 last_is_slash = false;
5247 continue;
5248 }
5249 if (slash_ok && ch == '/') {
5250 if (last_is_slash) {
5251 return NULL; // Don't permit consecutive slashes
5252 }
5253 last_is_slash = true;
5254 continue;
5255 }
5256 } else {
5257 jint unicode_ch;
5258 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5259 p = tmp_p;
5260 last_is_slash = false;
5261 // Check if ch is Java identifier start or is Java identifier part
5262 // 4672820: call java.lang.Character methods directly without generating separate tables.
5263 EXCEPTION_MARK;
5264 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5265
5266 // return value
5267 JavaValue result(T_BOOLEAN);
5268 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5269 JavaCallArguments args;
5270 args.push_int(unicode_ch);
5271
5272 // public static boolean isJavaIdentifierStart(char ch);
5273 JavaCalls::call_static(&result,
5274 klass,
5275 vmSymbols::isJavaIdentifierStart_name(),
5276 vmSymbols::int_bool_signature(),
5277 &args,
5278 THREAD);
5279
5280 if (HAS_PENDING_EXCEPTION) {
5281 CLEAR_PENDING_EXCEPTION;
5282 return 0;
5283 }
5284 if (result.get_jboolean()) {
5285 continue;
5286 }
5287
5288 if (not_first_ch) {
5289 // public static boolean isJavaIdentifierPart(char ch);
5290 JavaCalls::call_static(&result,
5291 klass,
5292 vmSymbols::isJavaIdentifierPart_name(),
5293 vmSymbols::int_bool_signature(),
5294 &args,
5295 THREAD);
5296
5297 if (HAS_PENDING_EXCEPTION) {
5298 CLEAR_PENDING_EXCEPTION;
5299 return 0;
5300 }
5301
5302 if (result.get_jboolean()) {
5303 continue;
5304 }
5305 }
5306 }
5307 return (not_first_ch) ? old_p : NULL;
5308 }
5309 return (not_first_ch) ? p : NULL;
5310 }
5311
5312
5313 // Take pointer to a string. Skip over the longest part of the string that could
5314 // be taken as a field signature. Allow "void" if void_ok.
5315 // Return a pointer to just past the signature.
5316 // Return NULL if no legal signature is found.
5317 char* ClassFileParser::skip_over_field_signature(char* signature,
5318 bool void_ok,
5319 unsigned int length,
5320 TRAPS) {
5321 unsigned int array_dim = 0;
5322 while (length > 0) {
5323 switch (signature[0]) {
5324 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5325 case JVM_SIGNATURE_BOOLEAN:
5326 case JVM_SIGNATURE_BYTE:
5327 case JVM_SIGNATURE_CHAR:
5328 case JVM_SIGNATURE_SHORT:
5329 case JVM_SIGNATURE_INT:
5330 case JVM_SIGNATURE_FLOAT:
5331 case JVM_SIGNATURE_LONG:
5332 case JVM_SIGNATURE_DOUBLE:
5333 return signature + 1;
5334 case JVM_SIGNATURE_CLASS: {
5335 if (_major_version < JAVA_1_5_VERSION) {
5336 // Skip over the class name if one is there
5337 char* p = skip_over_field_name(signature + 1, true, --length);
5338
5339 // The next character better be a semicolon
5340 if (p && (p - signature) > 1 && p[0] == ';') {
5341 return p + 1;
5342 }
5343 } else {
5344 // 4900761: For class version > 48, any unicode is allowed in class name.
5345 length--;
5346 signature++;
5347 while (length > 0 && signature[0] != ';') {
5348 if (signature[0] == '.') {
5349 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5350 }
5351 length--;
5352 signature++;
5353 }
5354 if (signature[0] == ';') { return signature + 1; }
5355 }
5356
5357 return NULL;
5358 }
5359 case JVM_SIGNATURE_ARRAY:
5360 array_dim++;
5361 if (array_dim > 255) {
5362 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5363 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5364 }
5365 // The rest of what's there better be a legal signature
5366 signature++;
5367 length--;
5368 void_ok = false;
5369 break;
5370
5371 default:
5372 return NULL;
5373 }
5374 }
5375 return NULL;
5376 }