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