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 "logging/log.hpp"
38 #include "memory/allocation.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/referenceType.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.inline.hpp"
44 #include "oops/constantPool.hpp"
45 #include "oops/fieldStreams.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/instanceMirrorKlass.hpp"
48 #include "oops/klass.inline.hpp"
49 #include "oops/klassVtable.hpp"
50 #include "oops/method.hpp"
51 #include "oops/symbol.hpp"
52 #include "prims/jvm.h"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/jvmtiThreadState.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/perfData.hpp"
57 #include "runtime/reflection.hpp"
58 #include "runtime/signature.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/classLoadingService.hpp"
61 #include "services/threadService.hpp"
62 #include "utilities/array.hpp"
63 #include "utilities/exceptions.hpp"
64 #include "utilities/globalDefinitions.hpp"
65 #include "utilities/macros.hpp"
66 #include "utilities/ostream.hpp"
67 #include "utilities/resourceHash.hpp"
68 #if INCLUDE_CDS
69 #include "classfile/systemDictionaryShared.hpp"
70 #endif
71
72 // We generally try to create the oops directly when parsing, rather than
73 // allocating temporary data structures and copying the bytes twice. A
74 // temporary area is only needed when parsing utf8 entries in the constant
75 // pool and when parsing line number tables.
76
77 // We add assert in debug mode when class format is not checked.
78
79 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
80 #define JAVA_MIN_SUPPORTED_VERSION 45
81 #define JAVA_MAX_SUPPORTED_VERSION 52
82 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
83
84 // Used for two backward compatibility reasons:
85 // - to check for new additions to the class file format in JDK1.5
86 // - to check for bug fixes in the format checker in JDK1.5
87 #define JAVA_1_5_VERSION 49
88
89 // Used for backward compatibility reasons:
90 // - to check for javac bug fixes that happened after 1.5
91 // - also used as the max version when running in jdk6
92 #define JAVA_6_VERSION 50
93
94 // Used for backward compatibility reasons:
95 // - to check NameAndType_info signatures more aggressively
96 // - to disallow argument and require ACC_STATIC for <clinit> methods
97 #define JAVA_7_VERSION 51
98
99 // Extension method support.
100 #define JAVA_8_VERSION 52
101
102 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
103 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
104 // this function (_current can be allocated in a register, with scalar
105 // replacement of aggregates). The _current pointer is copied back to
106 // stream() when this function returns. DON'T call another method within
107 // this method that uses stream().
108 ClassFileStream* cfs0 = stream();
109 ClassFileStream cfs1 = *cfs0;
110 ClassFileStream* cfs = &cfs1;
111 #ifdef ASSERT
112 assert(cfs->allocated_on_stack(),"should be local");
113 u1* old_current = cfs0->current();
114 #endif
115 Handle class_loader(THREAD, _loader_data->class_loader());
116
117 // Used for batching symbol allocations.
118 const char* names[SymbolTable::symbol_alloc_batch_size];
119 int lengths[SymbolTable::symbol_alloc_batch_size];
120 int indices[SymbolTable::symbol_alloc_batch_size];
121 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
122 int names_count = 0;
123
124 // parsing Index 0 is unused
125 for (int index = 1; index < length; index++) {
126 // Each of the following case guarantees one more byte in the stream
127 // for the following tag or the access_flags following constant pool,
128 // so we don't need bounds-check for reading tag.
129 u1 tag = cfs->get_u1_fast();
130 switch (tag) {
131 case JVM_CONSTANT_Class :
132 {
133 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
134 u2 name_index = cfs->get_u2_fast();
135 _cp->klass_index_at_put(index, name_index);
136 }
137 break;
138 case JVM_CONSTANT_Fieldref :
139 {
140 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
141 u2 class_index = cfs->get_u2_fast();
142 u2 name_and_type_index = cfs->get_u2_fast();
143 _cp->field_at_put(index, class_index, name_and_type_index);
144 }
145 break;
146 case JVM_CONSTANT_Methodref :
147 {
148 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
149 u2 class_index = cfs->get_u2_fast();
150 u2 name_and_type_index = cfs->get_u2_fast();
151 _cp->method_at_put(index, class_index, name_and_type_index);
152 }
153 break;
154 case JVM_CONSTANT_InterfaceMethodref :
155 {
156 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
157 u2 class_index = cfs->get_u2_fast();
158 u2 name_and_type_index = cfs->get_u2_fast();
159 _cp->interface_method_at_put(index, class_index, name_and_type_index);
160 }
161 break;
162 case JVM_CONSTANT_String :
163 {
164 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
165 u2 string_index = cfs->get_u2_fast();
166 _cp->string_index_at_put(index, string_index);
167 }
168 break;
169 case JVM_CONSTANT_MethodHandle :
170 case JVM_CONSTANT_MethodType :
171 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
172 classfile_parse_error(
173 "Class file version does not support constant tag %u in class file %s",
174 tag, CHECK);
175 }
176 if (tag == JVM_CONSTANT_MethodHandle) {
177 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
178 u1 ref_kind = cfs->get_u1_fast();
179 u2 method_index = cfs->get_u2_fast();
180 _cp->method_handle_index_at_put(index, ref_kind, method_index);
181 } else if (tag == JVM_CONSTANT_MethodType) {
182 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
183 u2 signature_index = cfs->get_u2_fast();
184 _cp->method_type_index_at_put(index, signature_index);
185 } else {
186 ShouldNotReachHere();
187 }
188 break;
189 case JVM_CONSTANT_InvokeDynamic :
190 {
191 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
192 classfile_parse_error(
193 "Class file version does not support constant tag %u in class file %s",
194 tag, CHECK);
195 }
196 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
197 u2 bootstrap_specifier_index = cfs->get_u2_fast();
198 u2 name_and_type_index = cfs->get_u2_fast();
199 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
200 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
201 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
202 }
203 break;
204 case JVM_CONSTANT_Integer :
205 {
206 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
207 u4 bytes = cfs->get_u4_fast();
208 _cp->int_at_put(index, (jint) bytes);
209 }
210 break;
211 case JVM_CONSTANT_Float :
212 {
213 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
214 u4 bytes = cfs->get_u4_fast();
215 _cp->float_at_put(index, *(jfloat*)&bytes);
216 }
217 break;
218 case JVM_CONSTANT_Long :
219 // A mangled type might cause you to overrun allocated memory
220 guarantee_property(index+1 < length,
221 "Invalid constant pool entry %u in class file %s",
222 index, CHECK);
223 {
224 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
225 u8 bytes = cfs->get_u8_fast();
226 _cp->long_at_put(index, bytes);
227 }
228 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
229 break;
230 case JVM_CONSTANT_Double :
231 // A mangled type might cause you to overrun allocated memory
232 guarantee_property(index+1 < length,
233 "Invalid constant pool entry %u in class file %s",
234 index, CHECK);
235 {
236 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
237 u8 bytes = cfs->get_u8_fast();
238 _cp->double_at_put(index, *(jdouble*)&bytes);
239 }
240 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
241 break;
242 case JVM_CONSTANT_NameAndType :
243 {
244 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
245 u2 name_index = cfs->get_u2_fast();
246 u2 signature_index = cfs->get_u2_fast();
247 _cp->name_and_type_at_put(index, name_index, signature_index);
248 }
249 break;
250 case JVM_CONSTANT_Utf8 :
251 {
252 cfs->guarantee_more(2, CHECK); // utf8_length
253 u2 utf8_length = cfs->get_u2_fast();
254 u1* utf8_buffer = cfs->get_u1_buffer();
255 assert(utf8_buffer != NULL, "null utf8 buffer");
256 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
257 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
258 cfs->skip_u1_fast(utf8_length);
259
260 // Before storing the symbol, make sure it's legal
261 if (_need_verify) {
262 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
263 }
264
265 if (has_cp_patch_at(index)) {
266 Handle patch = clear_cp_patch_at(index);
267 guarantee_property(java_lang_String::is_instance(patch()),
268 "Illegal utf8 patch at %d in class file %s",
269 index, CHECK);
270 char* str = java_lang_String::as_utf8_string(patch());
271 // (could use java_lang_String::as_symbol instead, but might as well batch them)
272 utf8_buffer = (u1*) str;
273 utf8_length = (int) strlen(str);
274 }
275
276 unsigned int hash;
277 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
278 if (result == NULL) {
279 names[names_count] = (char*)utf8_buffer;
280 lengths[names_count] = utf8_length;
281 indices[names_count] = index;
282 hashValues[names_count++] = hash;
283 if (names_count == SymbolTable::symbol_alloc_batch_size) {
284 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
285 names_count = 0;
286 }
287 } else {
288 _cp->symbol_at_put(index, result);
289 }
290 }
291 break;
292 default:
293 classfile_parse_error(
294 "Unknown constant tag %u in class file %s", tag, CHECK);
295 break;
296 }
297 }
298
299 // Allocate the remaining symbols
300 if (names_count > 0) {
301 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
302 }
303
304 // Copy _current pointer of local copy back to stream().
305 #ifdef ASSERT
306 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
307 #endif
308 cfs0->set_current(cfs1.current());
309 }
310
311 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
312
313 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
314 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
315 return cp->symbol_at(index);
316 else
317 return NULL;
318 }
319
320 #ifdef ASSERT
321 PRAGMA_DIAG_PUSH
322 PRAGMA_FORMAT_NONLITERAL_IGNORED
323 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) {
324 ResourceMark rm(THREAD);
325 fatal(msg, _class_name->as_C_string());
326 }
327
328 void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) {
329 ResourceMark rm(THREAD);
330 fatal(msg, index, _class_name->as_C_string());
331 }
332 PRAGMA_DIAG_POP
333 #endif
334
335 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
336 ClassFileStream* cfs = stream();
337 constantPoolHandle nullHandle;
338
339 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
340 u2 length = cfs->get_u2_fast();
341 guarantee_property(
342 length >= 1, "Illegal constant pool size %u in class file %s",
343 length, CHECK_(nullHandle));
344 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
345 CHECK_(nullHandle));
346 _cp = constant_pool; // save in case of errors
347 constantPoolHandle cp (THREAD, constant_pool);
348
349 // parsing constant pool entries
350 parse_constant_pool_entries(length, CHECK_(nullHandle));
351
352 int index = 1; // declared outside of loops for portability
353
354 // first verification pass - validate cross references and fixup class and string constants
355 for (index = 1; index < length; index++) { // Index 0 is unused
356 jbyte tag = cp->tag_at(index).value();
357 switch (tag) {
358 case JVM_CONSTANT_Class :
359 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
360 break;
361 case JVM_CONSTANT_Fieldref :
362 // fall through
363 case JVM_CONSTANT_Methodref :
364 // fall through
365 case JVM_CONSTANT_InterfaceMethodref : {
366 if (!_need_verify) break;
367 int klass_ref_index = cp->klass_ref_index_at(index);
368 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
369 check_property(valid_klass_reference_at(klass_ref_index),
370 "Invalid constant pool index %u in class file %s",
371 klass_ref_index,
372 CHECK_(nullHandle));
373 check_property(valid_cp_range(name_and_type_ref_index, length) &&
374 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
375 "Invalid constant pool index %u in class file %s",
376 name_and_type_ref_index,
377 CHECK_(nullHandle));
378 break;
379 }
380 case JVM_CONSTANT_String :
381 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
382 break;
383 case JVM_CONSTANT_Integer :
384 break;
385 case JVM_CONSTANT_Float :
386 break;
387 case JVM_CONSTANT_Long :
388 case JVM_CONSTANT_Double :
389 index++;
390 check_property(
391 (index < length && cp->tag_at(index).is_invalid()),
392 "Improper constant pool long/double index %u in class file %s",
393 index, CHECK_(nullHandle));
394 break;
395 case JVM_CONSTANT_NameAndType : {
396 if (!_need_verify) break;
397 int name_ref_index = cp->name_ref_index_at(index);
398 int signature_ref_index = cp->signature_ref_index_at(index);
399 check_property(valid_symbol_at(name_ref_index),
400 "Invalid constant pool index %u in class file %s",
401 name_ref_index, CHECK_(nullHandle));
402 check_property(valid_symbol_at(signature_ref_index),
403 "Invalid constant pool index %u in class file %s",
404 signature_ref_index, CHECK_(nullHandle));
405 break;
406 }
407 case JVM_CONSTANT_Utf8 :
408 break;
409 case JVM_CONSTANT_UnresolvedClass : // fall-through
410 case JVM_CONSTANT_UnresolvedClassInError:
411 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
412 break;
413 case JVM_CONSTANT_ClassIndex :
414 {
415 int class_index = cp->klass_index_at(index);
416 check_property(valid_symbol_at(class_index),
417 "Invalid constant pool index %u in class file %s",
418 class_index, CHECK_(nullHandle));
419 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
420 }
421 break;
422 case JVM_CONSTANT_StringIndex :
423 {
424 int string_index = cp->string_index_at(index);
425 check_property(valid_symbol_at(string_index),
426 "Invalid constant pool index %u in class file %s",
427 string_index, CHECK_(nullHandle));
428 Symbol* sym = cp->symbol_at(string_index);
429 cp->unresolved_string_at_put(index, sym);
430 }
431 break;
432 case JVM_CONSTANT_MethodHandle :
433 {
434 int ref_index = cp->method_handle_index_at(index);
435 check_property(
436 valid_cp_range(ref_index, length),
437 "Invalid constant pool index %u in class file %s",
438 ref_index, CHECK_(nullHandle));
439 constantTag tag = cp->tag_at(ref_index);
440 int ref_kind = cp->method_handle_ref_kind_at(index);
441 switch (ref_kind) {
442 case JVM_REF_getField:
443 case JVM_REF_getStatic:
444 case JVM_REF_putField:
445 case JVM_REF_putStatic:
446 check_property(
447 tag.is_field(),
448 "Invalid constant pool index %u in class file %s (not a field)",
449 ref_index, CHECK_(nullHandle));
450 break;
451 case JVM_REF_invokeVirtual:
452 case JVM_REF_newInvokeSpecial:
453 check_property(
454 tag.is_method(),
455 "Invalid constant pool index %u in class file %s (not a method)",
456 ref_index, CHECK_(nullHandle));
457 break;
458 case JVM_REF_invokeStatic:
459 case JVM_REF_invokeSpecial:
460 check_property(tag.is_method() ||
461 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
462 "Invalid constant pool index %u in class file %s (not a method)",
463 ref_index, CHECK_(nullHandle));
464 break;
465 case JVM_REF_invokeInterface:
466 check_property(
467 tag.is_interface_method(),
468 "Invalid constant pool index %u in class file %s (not an interface method)",
469 ref_index, CHECK_(nullHandle));
470 break;
471 default:
472 classfile_parse_error(
473 "Bad method handle kind at constant pool index %u in class file %s",
474 index, CHECK_(nullHandle));
475 }
476 // Keep the ref_index unchanged. It will be indirected at link-time.
477 }
478 break;
479 case JVM_CONSTANT_MethodType :
480 {
481 int ref_index = cp->method_type_index_at(index);
482 check_property(valid_symbol_at(ref_index),
483 "Invalid constant pool index %u in class file %s",
484 ref_index, CHECK_(nullHandle));
485 }
486 break;
487 case JVM_CONSTANT_InvokeDynamic :
488 {
489 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
490 check_property(valid_cp_range(name_and_type_ref_index, length) &&
491 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
492 "Invalid constant pool index %u in class file %s",
493 name_and_type_ref_index,
494 CHECK_(nullHandle));
495 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
496 break;
497 }
498 default:
499 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
500 ShouldNotReachHere();
501 break;
502 } // end of switch
503 } // end of for
504
505 if (_cp_patches != NULL) {
506 // need to treat this_class specially...
507 int this_class_index;
508 {
509 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
510 u1* mark = cfs->current();
511 u2 flags = cfs->get_u2_fast();
512 this_class_index = cfs->get_u2_fast();
513 cfs->set_current(mark); // revert to mark
514 }
515
516 for (index = 1; index < length; index++) { // Index 0 is unused
517 if (has_cp_patch_at(index)) {
518 guarantee_property(index != this_class_index,
519 "Illegal constant pool patch to self at %d in class file %s",
520 index, CHECK_(nullHandle));
521 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
522 }
523 }
524 }
525
526 if (!_need_verify) {
527 return cp;
528 }
529
530 // second verification pass - checks the strings are of the right format.
531 // but not yet to the other entries
532 for (index = 1; index < length; index++) {
533 jbyte tag = cp->tag_at(index).value();
534 switch (tag) {
535 case JVM_CONSTANT_UnresolvedClass: {
536 Symbol* class_name = cp->klass_name_at(index);
537 // check the name, even if _cp_patches will overwrite it
538 verify_legal_class_name(class_name, CHECK_(nullHandle));
539 break;
540 }
541 case JVM_CONSTANT_NameAndType: {
542 if (_need_verify && _major_version >= JAVA_7_VERSION) {
543 int sig_index = cp->signature_ref_index_at(index);
544 int name_index = cp->name_ref_index_at(index);
545 Symbol* name = cp->symbol_at(name_index);
546 Symbol* sig = cp->symbol_at(sig_index);
547 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
548 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
549 } else {
550 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
551 }
552 }
553 break;
554 }
555 case JVM_CONSTANT_InvokeDynamic:
556 case JVM_CONSTANT_Fieldref:
557 case JVM_CONSTANT_Methodref:
558 case JVM_CONSTANT_InterfaceMethodref: {
559 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
560 // already verified to be utf8
561 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
562 // already verified to be utf8
563 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
564 Symbol* name = cp->symbol_at(name_ref_index);
565 Symbol* signature = cp->symbol_at(signature_ref_index);
566 if (tag == JVM_CONSTANT_Fieldref) {
567 verify_legal_field_name(name, CHECK_(nullHandle));
568 if (_need_verify && _major_version >= JAVA_7_VERSION) {
569 // Signature is verified above, when iterating NameAndType_info.
570 // Need only to be sure it's the right type.
571 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
572 throwIllegalSignature(
573 "Field", name, signature, CHECK_(nullHandle));
574 }
575 } else {
576 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
577 }
578 } else {
579 verify_legal_method_name(name, CHECK_(nullHandle));
580 if (_need_verify && _major_version >= JAVA_7_VERSION) {
581 // Signature is verified above, when iterating NameAndType_info.
582 // Need only to be sure it's the right type.
583 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
584 throwIllegalSignature(
585 "Method", name, signature, CHECK_(nullHandle));
586 }
587 } else {
588 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
589 }
590 if (tag == JVM_CONSTANT_Methodref) {
591 // 4509014: If a class method name begins with '<', it must be "<init>".
592 assert(name != NULL, "method name in constant pool is null");
593 unsigned int name_len = name->utf8_length();
594 assert(name_len > 0, "bad method name"); // already verified as legal name
595 if (name->byte_at(0) == '<') {
596 if (name != vmSymbols::object_initializer_name()) {
597 classfile_parse_error(
598 "Bad method name at constant pool index %u in class file %s",
599 name_ref_index, CHECK_(nullHandle));
600 }
601 }
602 }
603 }
604 break;
605 }
606 case JVM_CONSTANT_MethodHandle: {
607 int ref_index = cp->method_handle_index_at(index);
608 int ref_kind = cp->method_handle_ref_kind_at(index);
609 switch (ref_kind) {
610 case JVM_REF_invokeVirtual:
611 case JVM_REF_invokeStatic:
612 case JVM_REF_invokeSpecial:
613 case JVM_REF_newInvokeSpecial:
614 {
615 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
616 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
617 Symbol* name = cp->symbol_at(name_ref_index);
618 if (ref_kind == JVM_REF_newInvokeSpecial) {
619 if (name != vmSymbols::object_initializer_name()) {
620 classfile_parse_error(
621 "Bad constructor name at constant pool index %u in class file %s",
622 name_ref_index, CHECK_(nullHandle));
623 }
624 } else {
625 if (name == vmSymbols::object_initializer_name()) {
626 classfile_parse_error(
627 "Bad method name at constant pool index %u in class file %s",
628 name_ref_index, CHECK_(nullHandle));
629 }
630 }
631 }
632 break;
633 // Other ref_kinds are already fully checked in previous pass.
634 }
635 break;
636 }
637 case JVM_CONSTANT_MethodType: {
638 Symbol* no_name = vmSymbols::type_name(); // place holder
639 Symbol* signature = cp->method_type_signature_at(index);
640 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
641 break;
642 }
643 case JVM_CONSTANT_Utf8: {
644 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
645 }
646 } // end of switch
647 } // end of for
648
649 return cp;
650 }
651
652
653 void ClassFileParser::patch_constant_pool(const constantPoolHandle& cp, int index, Handle patch, TRAPS) {
654 BasicType patch_type = T_VOID;
655
656 switch (cp->tag_at(index).value()) {
657
658 case JVM_CONSTANT_UnresolvedClass :
659 // Patching a class means pre-resolving it.
660 // The name in the constant pool is ignored.
661 if (java_lang_Class::is_instance(patch())) {
662 guarantee_property(!java_lang_Class::is_primitive(patch()),
663 "Illegal class patch at %d in class file %s",
664 index, CHECK);
665 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
666 } else {
667 guarantee_property(java_lang_String::is_instance(patch()),
668 "Illegal class patch at %d in class file %s",
669 index, CHECK);
670 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
671 cp->unresolved_klass_at_put(index, name);
672 }
673 break;
674
675 case JVM_CONSTANT_String :
676 // skip this patch and don't clear it. Needs the oop array for resolved
677 // references to be created first.
678 return;
679
680 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
681 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
682 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
683 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
684 patch_prim:
685 {
686 jvalue value;
687 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
688 guarantee_property(value_type == patch_type,
689 "Illegal primitive patch at %d in class file %s",
690 index, CHECK);
691 switch (value_type) {
692 case T_INT: cp->int_at_put(index, value.i); break;
693 case T_FLOAT: cp->float_at_put(index, value.f); break;
694 case T_LONG: cp->long_at_put(index, value.j); break;
695 case T_DOUBLE: cp->double_at_put(index, value.d); break;
696 default: assert(false, "");
697 }
698 }
699 break;
700
701 default:
702 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
703 guarantee_property(!has_cp_patch_at(index),
704 "Illegal unexpected patch at %d in class file %s",
705 index, CHECK);
706 return;
707 }
708
709 // On fall-through, mark the patch as used.
710 clear_cp_patch_at(index);
711 }
712
713
714 class NameSigHash: public ResourceObj {
715 public:
716 Symbol* _name; // name
717 Symbol* _sig; // signature
718 NameSigHash* _next; // Next entry in hash table
719 };
720
721
722 #define HASH_ROW_SIZE 256
723
724 unsigned int hash(Symbol* name, Symbol* sig) {
725 unsigned int raw_hash = 0;
726 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
727 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
728
729 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
730 }
731
732
733 void initialize_hashtable(NameSigHash** table) {
734 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
735 }
736
737 // Return false if the name/sig combination is found in table.
738 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
739 // The old format checker uses heap sort to find duplicates.
740 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
741 // of table since we don't expect Symbol*'s to move.
742 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
743 assert(name != NULL, "name in constant pool is NULL");
744
745 // First lookup for duplicates
746 int index = hash(name, sig);
747 NameSigHash* entry = table[index];
748 while (entry != NULL) {
749 if (entry->_name == name && entry->_sig == sig) {
750 return false;
751 }
752 entry = entry->_next;
753 }
754
755 // No duplicate is found, allocate a new entry and fill it.
756 entry = new NameSigHash();
757 entry->_name = name;
758 entry->_sig = sig;
759
760 // Insert into hash table
761 entry->_next = table[index];
762 table[index] = entry;
763
764 return true;
765 }
766
767
768 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
769 Handle protection_domain,
770 Symbol* class_name,
771 bool* has_default_methods,
772 TRAPS) {
773 if (length == 0) {
774 _local_interfaces = Universe::the_empty_klass_array();
775 } else {
776 ClassFileStream* cfs = stream();
777 assert(length > 0, "only called for length>0");
778 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
779
780 int index;
781 for (index = 0; index < length; index++) {
782 u2 interface_index = cfs->get_u2(CHECK_NULL);
783 KlassHandle interf;
784 check_property(
785 valid_klass_reference_at(interface_index),
786 "Interface name has bad constant pool index %u in class file %s",
787 interface_index, CHECK_NULL);
788 if (_cp->tag_at(interface_index).is_klass()) {
789 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
790 } else {
791 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
792
793 // Don't need to check legal name because it's checked when parsing constant pool.
794 // But need to make sure it's not an array type.
795 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
796 "Bad interface name in class file %s", CHECK_NULL);
797 Handle class_loader(THREAD, _loader_data->class_loader());
798
799 // Call resolve_super so classcircularity is checked
800 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
801 unresolved_klass, class_loader, protection_domain,
802 false, CHECK_NULL);
803 interf = KlassHandle(THREAD, k);
804 }
805
806 if (!interf()->is_interface()) {
807 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
808 }
809 if (InstanceKlass::cast(interf())->has_default_methods()) {
810 *has_default_methods = true;
811 }
812 _local_interfaces->at_put(index, interf());
813 }
814
815 if (!_need_verify || length <= 1) {
816 return _local_interfaces;
817 }
818
819 // Check if there's any duplicates in interfaces
820 ResourceMark rm(THREAD);
821 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
822 THREAD, NameSigHash*, HASH_ROW_SIZE);
823 initialize_hashtable(interface_names);
824 bool dup = false;
825 {
826 debug_only(No_Safepoint_Verifier nsv;)
827 for (index = 0; index < length; index++) {
828 Klass* k = _local_interfaces->at(index);
829 Symbol* name = k->name();
830 // If no duplicates, add (name, NULL) in hashtable interface_names.
831 if (!put_after_lookup(name, NULL, interface_names)) {
832 dup = true;
833 break;
834 }
835 }
836 }
837 if (dup) {
838 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
839 }
840 }
841 return _local_interfaces;
842 }
843
844
845 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
846 // Make sure the constant pool entry is of a type appropriate to this field
847 guarantee_property(
848 (constantvalue_index > 0 &&
849 constantvalue_index < _cp->length()),
850 "Bad initial value index %u in ConstantValue attribute in class file %s",
851 constantvalue_index, CHECK);
852 constantTag value_type = _cp->tag_at(constantvalue_index);
853 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
854 case T_LONG:
855 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
856 break;
857 case T_FLOAT:
858 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
859 break;
860 case T_DOUBLE:
861 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
862 break;
863 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
864 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
865 break;
866 case T_OBJECT:
867 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
868 && value_type.is_string()),
869 "Bad string initial value in class file %s", CHECK);
870 break;
871 default:
872 classfile_parse_error(
873 "Unable to set initial value %u in class file %s",
874 constantvalue_index, CHECK);
875 }
876 }
877
878
879 // Parse attributes for a field.
880 void ClassFileParser::parse_field_attributes(u2 attributes_count,
881 bool is_static, u2 signature_index,
882 u2* constantvalue_index_addr,
883 bool* is_synthetic_addr,
884 u2* generic_signature_index_addr,
885 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
886 TRAPS) {
887 ClassFileStream* cfs = stream();
888 assert(attributes_count > 0, "length should be greater than 0");
889 u2 constantvalue_index = 0;
890 u2 generic_signature_index = 0;
891 bool is_synthetic = false;
892 u1* runtime_visible_annotations = NULL;
893 int runtime_visible_annotations_length = 0;
894 u1* runtime_invisible_annotations = NULL;
895 int runtime_invisible_annotations_length = 0;
896 u1* runtime_visible_type_annotations = NULL;
897 int runtime_visible_type_annotations_length = 0;
898 u1* runtime_invisible_type_annotations = NULL;
899 int runtime_invisible_type_annotations_length = 0;
900 bool runtime_invisible_annotations_exists = false;
901 bool runtime_invisible_type_annotations_exists = false;
902 while (attributes_count--) {
903 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
904 u2 attribute_name_index = cfs->get_u2_fast();
905 u4 attribute_length = cfs->get_u4_fast();
906 check_property(valid_symbol_at(attribute_name_index),
907 "Invalid field attribute index %u in class file %s",
908 attribute_name_index,
909 CHECK);
910 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
911 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
912 // ignore if non-static
913 if (constantvalue_index != 0) {
914 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
915 }
916 check_property(
917 attribute_length == 2,
918 "Invalid ConstantValue field attribute length %u in class file %s",
919 attribute_length, CHECK);
920 constantvalue_index = cfs->get_u2(CHECK);
921 if (_need_verify) {
922 verify_constantvalue(constantvalue_index, signature_index, CHECK);
923 }
924 } else if (attribute_name == vmSymbols::tag_synthetic()) {
925 if (attribute_length != 0) {
926 classfile_parse_error(
927 "Invalid Synthetic field attribute length %u in class file %s",
928 attribute_length, CHECK);
929 }
930 is_synthetic = true;
931 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
932 if (attribute_length != 0) {
933 classfile_parse_error(
934 "Invalid Deprecated field attribute length %u in class file %s",
935 attribute_length, CHECK);
936 }
937 } else if (_major_version >= JAVA_1_5_VERSION) {
938 if (attribute_name == vmSymbols::tag_signature()) {
939 if (attribute_length != 2) {
940 classfile_parse_error(
941 "Wrong size %u for field's Signature attribute in class file %s",
942 attribute_length, CHECK);
943 }
944 generic_signature_index = parse_generic_signature_attribute(CHECK);
945 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
946 if (runtime_visible_annotations != NULL) {
947 classfile_parse_error(
948 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
949 }
950 runtime_visible_annotations_length = attribute_length;
951 runtime_visible_annotations = cfs->get_u1_buffer();
952 assert(runtime_visible_annotations != NULL, "null visible annotations");
953 parse_annotations(runtime_visible_annotations,
954 runtime_visible_annotations_length,
955 parsed_annotations);
956 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
957 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
958 if (runtime_invisible_annotations_exists) {
959 classfile_parse_error(
960 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
961 }
962 runtime_invisible_annotations_exists = true;
963 if (PreserveAllAnnotations) {
964 runtime_invisible_annotations_length = attribute_length;
965 runtime_invisible_annotations = cfs->get_u1_buffer();
966 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
967 }
968 cfs->skip_u1(attribute_length, CHECK);
969 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
970 if (runtime_visible_type_annotations != NULL) {
971 classfile_parse_error(
972 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
973 }
974 runtime_visible_type_annotations_length = attribute_length;
975 runtime_visible_type_annotations = cfs->get_u1_buffer();
976 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
977 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
978 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
979 if (runtime_invisible_type_annotations_exists) {
980 classfile_parse_error(
981 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
982 } else {
983 runtime_invisible_type_annotations_exists = true;
984 }
985 if (PreserveAllAnnotations) {
986 runtime_invisible_type_annotations_length = attribute_length;
987 runtime_invisible_type_annotations = cfs->get_u1_buffer();
988 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
989 }
990 cfs->skip_u1(attribute_length, CHECK);
991 } else {
992 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
993 }
994 } else {
995 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
996 }
997 }
998
999 *constantvalue_index_addr = constantvalue_index;
1000 *is_synthetic_addr = is_synthetic;
1001 *generic_signature_index_addr = generic_signature_index;
1002 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1003 runtime_visible_annotations_length,
1004 runtime_invisible_annotations,
1005 runtime_invisible_annotations_length,
1006 CHECK);
1007 parsed_annotations->set_field_annotations(a);
1008 a = assemble_annotations(runtime_visible_type_annotations,
1009 runtime_visible_type_annotations_length,
1010 runtime_invisible_type_annotations,
1011 runtime_invisible_type_annotations_length,
1012 CHECK);
1013 parsed_annotations->set_field_type_annotations(a);
1014 return;
1015 }
1016
1017
1018 // Field allocation types. Used for computing field offsets.
1019
1020 enum FieldAllocationType {
1021 STATIC_OOP, // Oops
1022 STATIC_BYTE, // Boolean, Byte, char
1023 STATIC_SHORT, // shorts
1024 STATIC_WORD, // ints
1025 STATIC_DOUBLE, // aligned long or double
1026 NONSTATIC_OOP,
1027 NONSTATIC_BYTE,
1028 NONSTATIC_SHORT,
1029 NONSTATIC_WORD,
1030 NONSTATIC_DOUBLE,
1031 MAX_FIELD_ALLOCATION_TYPE,
1032 BAD_ALLOCATION_TYPE = -1
1033 };
1034
1035 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1036 BAD_ALLOCATION_TYPE, // 0
1037 BAD_ALLOCATION_TYPE, // 1
1038 BAD_ALLOCATION_TYPE, // 2
1039 BAD_ALLOCATION_TYPE, // 3
1040 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1041 NONSTATIC_SHORT, // T_CHAR = 5,
1042 NONSTATIC_WORD, // T_FLOAT = 6,
1043 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1044 NONSTATIC_BYTE, // T_BYTE = 8,
1045 NONSTATIC_SHORT, // T_SHORT = 9,
1046 NONSTATIC_WORD, // T_INT = 10,
1047 NONSTATIC_DOUBLE, // T_LONG = 11,
1048 NONSTATIC_OOP, // T_OBJECT = 12,
1049 NONSTATIC_OOP, // T_ARRAY = 13,
1050 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1051 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1052 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1053 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1054 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1055 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1056 BAD_ALLOCATION_TYPE, // 0
1057 BAD_ALLOCATION_TYPE, // 1
1058 BAD_ALLOCATION_TYPE, // 2
1059 BAD_ALLOCATION_TYPE, // 3
1060 STATIC_BYTE , // T_BOOLEAN = 4,
1061 STATIC_SHORT, // T_CHAR = 5,
1062 STATIC_WORD, // T_FLOAT = 6,
1063 STATIC_DOUBLE, // T_DOUBLE = 7,
1064 STATIC_BYTE, // T_BYTE = 8,
1065 STATIC_SHORT, // T_SHORT = 9,
1066 STATIC_WORD, // T_INT = 10,
1067 STATIC_DOUBLE, // T_LONG = 11,
1068 STATIC_OOP, // T_OBJECT = 12,
1069 STATIC_OOP, // T_ARRAY = 13,
1070 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1071 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1072 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1073 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1074 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1075 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1076 };
1077
1078 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1079 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1080 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1081 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1082 return result;
1083 }
1084
1085 class FieldAllocationCount: public ResourceObj {
1086 public:
1087 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1088
1089 FieldAllocationCount() {
1090 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1091 count[i] = 0;
1092 }
1093 }
1094
1095 FieldAllocationType update(bool is_static, BasicType type) {
1096 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1097 // Make sure there is no overflow with injected fields.
1098 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1099 count[atype]++;
1100 return atype;
1101 }
1102 };
1103
1104 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1105 bool is_interface,
1106 FieldAllocationCount *fac,
1107 u2* java_fields_count_ptr, TRAPS) {
1108 ClassFileStream* cfs = stream();
1109 cfs->guarantee_more(2, CHECK_NULL); // length
1110 u2 length = cfs->get_u2_fast();
1111 *java_fields_count_ptr = length;
1112
1113 int num_injected = 0;
1114 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1115 int total_fields = length + num_injected;
1116
1117 // The field array starts with tuples of shorts
1118 // [access, name index, sig index, initial value index, byte offset].
1119 // A generic signature slot only exists for field with generic
1120 // signature attribute. And the access flag is set with
1121 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1122 // signature slots are at the end of the field array and after all
1123 // other fields data.
1124 //
1125 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1126 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1127 // ...
1128 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1129 // [generic signature index]
1130 // [generic signature index]
1131 // ...
1132 //
1133 // Allocate a temporary resource array for field data. For each field,
1134 // a slot is reserved in the temporary array for the generic signature
1135 // index. After parsing all fields, the data are copied to a permanent
1136 // array and any unused slots will be discarded.
1137 ResourceMark rm(THREAD);
1138 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1139 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1140
1141 // The generic signature slots start after all other fields' data.
1142 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1143 int num_generic_signature = 0;
1144 for (int n = 0; n < length; n++) {
1145 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1146
1147 AccessFlags access_flags;
1148 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1149 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1150 access_flags.set_flags(flags);
1151
1152 u2 name_index = cfs->get_u2_fast();
1153 int cp_size = _cp->length();
1154 check_property(valid_symbol_at(name_index),
1155 "Invalid constant pool index %u for field name in class file %s",
1156 name_index,
1157 CHECK_NULL);
1158 Symbol* name = _cp->symbol_at(name_index);
1159 verify_legal_field_name(name, CHECK_NULL);
1160
1161 u2 signature_index = cfs->get_u2_fast();
1162 check_property(valid_symbol_at(signature_index),
1163 "Invalid constant pool index %u for field signature in class file %s",
1164 signature_index, CHECK_NULL);
1165 Symbol* sig = _cp->symbol_at(signature_index);
1166 verify_legal_field_signature(name, sig, CHECK_NULL);
1167
1168 u2 constantvalue_index = 0;
1169 bool is_synthetic = false;
1170 u2 generic_signature_index = 0;
1171 bool is_static = access_flags.is_static();
1172 FieldAnnotationCollector parsed_annotations(_loader_data);
1173
1174 u2 attributes_count = cfs->get_u2_fast();
1175 if (attributes_count > 0) {
1176 parse_field_attributes(attributes_count, is_static, signature_index,
1177 &constantvalue_index, &is_synthetic,
1178 &generic_signature_index, &parsed_annotations,
1179 CHECK_NULL);
1180 if (parsed_annotations.field_annotations() != NULL) {
1181 if (_fields_annotations == NULL) {
1182 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1183 _loader_data, length, NULL,
1184 CHECK_NULL);
1185 }
1186 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1187 parsed_annotations.set_field_annotations(NULL);
1188 }
1189 if (parsed_annotations.field_type_annotations() != NULL) {
1190 if (_fields_type_annotations == NULL) {
1191 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1192 _loader_data, length, NULL,
1193 CHECK_NULL);
1194 }
1195 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1196 parsed_annotations.set_field_type_annotations(NULL);
1197 }
1198
1199 if (is_synthetic) {
1200 access_flags.set_is_synthetic();
1201 }
1202 if (generic_signature_index != 0) {
1203 access_flags.set_field_has_generic_signature();
1204 fa[generic_signature_slot] = generic_signature_index;
1205 generic_signature_slot ++;
1206 num_generic_signature ++;
1207 }
1208 }
1209
1210 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1211 field->initialize(access_flags.as_short(),
1212 name_index,
1213 signature_index,
1214 constantvalue_index);
1215 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1216
1217 // Remember how many oops we encountered and compute allocation type
1218 FieldAllocationType atype = fac->update(is_static, type);
1219 field->set_allocation_type(atype);
1220
1221 // After field is initialized with type, we can augment it with aux info
1222 if (parsed_annotations.has_any_annotations())
1223 parsed_annotations.apply_to(field);
1224 }
1225
1226 int index = length;
1227 if (num_injected != 0) {
1228 for (int n = 0; n < num_injected; n++) {
1229 // Check for duplicates
1230 if (injected[n].may_be_java) {
1231 Symbol* name = injected[n].name();
1232 Symbol* signature = injected[n].signature();
1233 bool duplicate = false;
1234 for (int i = 0; i < length; i++) {
1235 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1236 if (name == _cp->symbol_at(f->name_index()) &&
1237 signature == _cp->symbol_at(f->signature_index())) {
1238 // Symbol is desclared in Java so skip this one
1239 duplicate = true;
1240 break;
1241 }
1242 }
1243 if (duplicate) {
1244 // These will be removed from the field array at the end
1245 continue;
1246 }
1247 }
1248
1249 // Injected field
1250 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1251 field->initialize(JVM_ACC_FIELD_INTERNAL,
1252 injected[n].name_index,
1253 injected[n].signature_index,
1254 0);
1255
1256 BasicType type = FieldType::basic_type(injected[n].signature());
1257
1258 // Remember how many oops we encountered and compute allocation type
1259 FieldAllocationType atype = fac->update(false, type);
1260 field->set_allocation_type(atype);
1261 index++;
1262 }
1263 }
1264
1265 // Now copy the fields' data from the temporary resource array.
1266 // Sometimes injected fields already exist in the Java source so
1267 // the fields array could be too long. In that case the
1268 // fields array is trimed. Also unused slots that were reserved
1269 // for generic signature indexes are discarded.
1270 Array<u2>* fields = MetadataFactory::new_array<u2>(
1271 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1272 CHECK_NULL);
1273 _fields = fields; // save in case of error
1274 {
1275 int i = 0;
1276 for (; i < index * FieldInfo::field_slots; i++) {
1277 fields->at_put(i, fa[i]);
1278 }
1279 for (int j = total_fields * FieldInfo::field_slots;
1280 j < generic_signature_slot; j++) {
1281 fields->at_put(i++, fa[j]);
1282 }
1283 assert(i == fields->length(), "");
1284 }
1285
1286 if (_need_verify && length > 1) {
1287 // Check duplicated fields
1288 ResourceMark rm(THREAD);
1289 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1290 THREAD, NameSigHash*, HASH_ROW_SIZE);
1291 initialize_hashtable(names_and_sigs);
1292 bool dup = false;
1293 {
1294 debug_only(No_Safepoint_Verifier nsv;)
1295 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1296 Symbol* name = fs.name();
1297 Symbol* sig = fs.signature();
1298 // If no duplicates, add name/signature in hashtable names_and_sigs.
1299 if (!put_after_lookup(name, sig, names_and_sigs)) {
1300 dup = true;
1301 break;
1302 }
1303 }
1304 }
1305 if (dup) {
1306 classfile_parse_error("Duplicate field name&signature in class file %s",
1307 CHECK_NULL);
1308 }
1309 }
1310
1311 return fields;
1312 }
1313
1314
1315 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1316 while (length-- > 0) {
1317 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1318 }
1319 }
1320
1321
1322 u2* ClassFileParser::parse_exception_table(u4 code_length,
1323 u4 exception_table_length,
1324 TRAPS) {
1325 ClassFileStream* cfs = stream();
1326
1327 u2* exception_table_start = cfs->get_u2_buffer();
1328 assert(exception_table_start != NULL, "null exception table");
1329 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1330 // Will check legal target after parsing code array in verifier.
1331 if (_need_verify) {
1332 for (unsigned int i = 0; i < exception_table_length; i++) {
1333 u2 start_pc = cfs->get_u2_fast();
1334 u2 end_pc = cfs->get_u2_fast();
1335 u2 handler_pc = cfs->get_u2_fast();
1336 u2 catch_type_index = cfs->get_u2_fast();
1337 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1338 "Illegal exception table range in class file %s",
1339 CHECK_NULL);
1340 guarantee_property(handler_pc < code_length,
1341 "Illegal exception table handler in class file %s",
1342 CHECK_NULL);
1343 if (catch_type_index != 0) {
1344 guarantee_property(valid_klass_reference_at(catch_type_index),
1345 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1346 }
1347 }
1348 } else {
1349 cfs->skip_u2_fast(exception_table_length * 4);
1350 }
1351 return exception_table_start;
1352 }
1353
1354 void ClassFileParser::parse_linenumber_table(
1355 u4 code_attribute_length, u4 code_length,
1356 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1357 ClassFileStream* cfs = stream();
1358 unsigned int num_entries = cfs->get_u2(CHECK);
1359
1360 // Each entry is a u2 start_pc, and a u2 line_number
1361 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1362
1363 // Verify line number attribute and table length
1364 check_property(
1365 code_attribute_length == sizeof(u2) + length_in_bytes,
1366 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1367
1368 cfs->guarantee_more(length_in_bytes, CHECK);
1369
1370 if ((*write_stream) == NULL) {
1371 if (length_in_bytes > fixed_buffer_size) {
1372 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1373 } else {
1374 (*write_stream) = new CompressedLineNumberWriteStream(
1375 linenumbertable_buffer, fixed_buffer_size);
1376 }
1377 }
1378
1379 while (num_entries-- > 0) {
1380 u2 bci = cfs->get_u2_fast(); // start_pc
1381 u2 line = cfs->get_u2_fast(); // line_number
1382 guarantee_property(bci < code_length,
1383 "Invalid pc in LineNumberTable in class file %s", CHECK);
1384 (*write_stream)->write_pair(bci, line);
1385 }
1386 }
1387
1388
1389 class LVT_Hash : public AllStatic {
1390 public:
1391
1392 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1393 /*
1394 * 3-tuple start_bci/length/slot has to be unique key,
1395 * so the following comparison seems to be redundant:
1396 * && elem->name_cp_index == entry->_elem->name_cp_index
1397 */
1398 return (e0.start_bci == e1.start_bci &&
1399 e0.length == e1.length &&
1400 e0.name_cp_index == e1.name_cp_index &&
1401 e0.slot == e1.slot);
1402 }
1403
1404 static unsigned int hash(LocalVariableTableElement const& e0) {
1405 unsigned int raw_hash = e0.start_bci;
1406
1407 raw_hash = e0.length + raw_hash * 37;
1408 raw_hash = e0.name_cp_index + raw_hash * 37;
1409 raw_hash = e0.slot + raw_hash * 37;
1410
1411 return raw_hash;
1412 }
1413 };
1414
1415
1416 // Class file LocalVariableTable elements.
1417 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1418 public:
1419 u2 start_bci;
1420 u2 length;
1421 u2 name_cp_index;
1422 u2 descriptor_cp_index;
1423 u2 slot;
1424 };
1425
1426 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1427 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1428 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1429 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1430 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1431 lvt->signature_cp_index = 0;
1432 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1433 }
1434
1435 // Function is used to parse both attributes:
1436 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1437 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1438 u2 max_locals,
1439 u4 code_attribute_length,
1440 u2* localvariable_table_length,
1441 bool isLVTT,
1442 TRAPS) {
1443 ClassFileStream* cfs = stream();
1444 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1445 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1446 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1447 // Verify local variable table attribute has right length
1448 if (_need_verify) {
1449 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1450 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1451 }
1452 u2* localvariable_table_start = cfs->get_u2_buffer();
1453 assert(localvariable_table_start != NULL, "null local variable table");
1454 if (!_need_verify) {
1455 cfs->skip_u2_fast(size);
1456 } else {
1457 cfs->guarantee_more(size * 2, CHECK_NULL);
1458 for(int i = 0; i < (*localvariable_table_length); i++) {
1459 u2 start_pc = cfs->get_u2_fast();
1460 u2 length = cfs->get_u2_fast();
1461 u2 name_index = cfs->get_u2_fast();
1462 u2 descriptor_index = cfs->get_u2_fast();
1463 u2 index = cfs->get_u2_fast();
1464 // Assign to a u4 to avoid overflow
1465 u4 end_pc = (u4)start_pc + (u4)length;
1466
1467 if (start_pc >= code_length) {
1468 classfile_parse_error(
1469 "Invalid start_pc %u in %s in class file %s",
1470 start_pc, tbl_name, CHECK_NULL);
1471 }
1472 if (end_pc > code_length) {
1473 classfile_parse_error(
1474 "Invalid length %u in %s in class file %s",
1475 length, tbl_name, CHECK_NULL);
1476 }
1477 int cp_size = _cp->length();
1478 guarantee_property(valid_symbol_at(name_index),
1479 "Name index %u in %s has bad constant type in class file %s",
1480 name_index, tbl_name, CHECK_NULL);
1481 guarantee_property(valid_symbol_at(descriptor_index),
1482 "Signature index %u in %s has bad constant type in class file %s",
1483 descriptor_index, tbl_name, CHECK_NULL);
1484
1485 Symbol* name = _cp->symbol_at(name_index);
1486 Symbol* sig = _cp->symbol_at(descriptor_index);
1487 verify_legal_field_name(name, CHECK_NULL);
1488 u2 extra_slot = 0;
1489 if (!isLVTT) {
1490 verify_legal_field_signature(name, sig, CHECK_NULL);
1491
1492 // 4894874: check special cases for double and long local variables
1493 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1494 sig == vmSymbols::type_signature(T_LONG)) {
1495 extra_slot = 1;
1496 }
1497 }
1498 guarantee_property((index + extra_slot) < max_locals,
1499 "Invalid index %u in %s in class file %s",
1500 index, tbl_name, CHECK_NULL);
1501 }
1502 }
1503 return localvariable_table_start;
1504 }
1505
1506
1507 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1508 u1* u1_array, u2* u2_array, TRAPS) {
1509 ClassFileStream* cfs = stream();
1510 u2 index = 0; // index in the array with long/double occupying two slots
1511 u4 i1 = *u1_index;
1512 u4 i2 = *u2_index + 1;
1513 for(int i = 0; i < array_length; i++) {
1514 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1515 index++;
1516 if (tag == ITEM_Long || tag == ITEM_Double) {
1517 index++;
1518 } else if (tag == ITEM_Object) {
1519 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1520 guarantee_property(valid_klass_reference_at(class_index),
1521 "Bad class index %u in StackMap in class file %s",
1522 class_index, CHECK);
1523 } else if (tag == ITEM_Uninitialized) {
1524 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1525 guarantee_property(
1526 offset < code_length,
1527 "Bad uninitialized type offset %u in StackMap in class file %s",
1528 offset, CHECK);
1529 } else {
1530 guarantee_property(
1531 tag <= (u1)ITEM_Uninitialized,
1532 "Unknown variable type %u in StackMap in class file %s",
1533 tag, CHECK);
1534 }
1535 }
1536 u2_array[*u2_index] = index;
1537 *u1_index = i1;
1538 *u2_index = i2;
1539 }
1540
1541 u1* ClassFileParser::parse_stackmap_table(
1542 u4 code_attribute_length, TRAPS) {
1543 if (code_attribute_length == 0)
1544 return NULL;
1545
1546 ClassFileStream* cfs = stream();
1547 u1* stackmap_table_start = cfs->get_u1_buffer();
1548 assert(stackmap_table_start != NULL, "null stackmap table");
1549
1550 // check code_attribute_length first
1551 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1552
1553 if (!_need_verify && !DumpSharedSpaces) {
1554 return NULL;
1555 }
1556 return stackmap_table_start;
1557 }
1558
1559 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1560 u4 method_attribute_length,
1561 TRAPS) {
1562 ClassFileStream* cfs = stream();
1563 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1564 *checked_exceptions_length = cfs->get_u2_fast();
1565 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1566 u2* checked_exceptions_start = cfs->get_u2_buffer();
1567 assert(checked_exceptions_start != NULL, "null checked exceptions");
1568 if (!_need_verify) {
1569 cfs->skip_u2_fast(size);
1570 } else {
1571 // Verify each value in the checked exception table
1572 u2 checked_exception;
1573 u2 len = *checked_exceptions_length;
1574 cfs->guarantee_more(2 * len, CHECK_NULL);
1575 for (int i = 0; i < len; i++) {
1576 checked_exception = cfs->get_u2_fast();
1577 check_property(
1578 valid_klass_reference_at(checked_exception),
1579 "Exception name has bad type at constant pool %u in class file %s",
1580 checked_exception, CHECK_NULL);
1581 }
1582 }
1583 // check exceptions attribute length
1584 if (_need_verify) {
1585 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1586 sizeof(u2) * size),
1587 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1588 }
1589 return checked_exceptions_start;
1590 }
1591
1592 void ClassFileParser::throwIllegalSignature(
1593 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1594 ResourceMark rm(THREAD);
1595 Exceptions::fthrow(THREAD_AND_LOCATION,
1596 vmSymbols::java_lang_ClassFormatError(),
1597 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1598 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1599 }
1600
1601 // Skip an annotation. Return >=limit if there is any problem.
1602 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1603 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1604 // value := switch (tag:u1) { ... }
1605 index += 2; // skip atype
1606 if ((index += 2) >= limit) return limit; // read nmem
1607 int nmem = Bytes::get_Java_u2(buffer+index-2);
1608 while (--nmem >= 0 && index < limit) {
1609 index += 2; // skip member
1610 index = skip_annotation_value(buffer, limit, index);
1611 }
1612 return index;
1613 }
1614
1615 // Skip an annotation value. Return >=limit if there is any problem.
1616 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1617 // value := switch (tag:u1) {
1618 // case B, C, I, S, Z, D, F, J, c: con:u2;
1619 // case e: e_class:u2 e_name:u2;
1620 // case s: s_con:u2;
1621 // case [: do(nval:u2) {value};
1622 // case @: annotation;
1623 // case s: s_con:u2;
1624 // }
1625 if ((index += 1) >= limit) return limit; // read tag
1626 u1 tag = buffer[index-1];
1627 switch (tag) {
1628 case 'B': case 'C': case 'I': case 'S': case 'Z':
1629 case 'D': case 'F': case 'J': case 'c': case 's':
1630 index += 2; // skip con or s_con
1631 break;
1632 case 'e':
1633 index += 4; // skip e_class, e_name
1634 break;
1635 case '[':
1636 {
1637 if ((index += 2) >= limit) return limit; // read nval
1638 int nval = Bytes::get_Java_u2(buffer+index-2);
1639 while (--nval >= 0 && index < limit) {
1640 index = skip_annotation_value(buffer, limit, index);
1641 }
1642 }
1643 break;
1644 case '@':
1645 index = skip_annotation(buffer, limit, index);
1646 break;
1647 default:
1648 return limit; // bad tag byte
1649 }
1650 return index;
1651 }
1652
1653 // Sift through annotations, looking for those significant to the VM:
1654 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1655 ClassFileParser::AnnotationCollector* coll) {
1656 // annotations := do(nann:u2) {annotation}
1657 int index = 0;
1658 if ((index += 2) >= limit) return; // read nann
1659 int nann = Bytes::get_Java_u2(buffer+index-2);
1660 enum { // initial annotation layout
1661 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1662 count_off = 2, // u2 such as 1 (one value)
1663 member_off = 4, // utf8 such as 'value'
1664 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1665 e_tag_val = 'e',
1666 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1667 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1668 e_size = 11, // end of 'e' annotation
1669 c_tag_val = 'c', // payload is type
1670 c_con_off = 7, // utf8 payload, such as 'I'
1671 c_size = 9, // end of 'c' annotation
1672 s_tag_val = 's', // payload is String
1673 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1674 s_size = 9,
1675 min_size = 6 // smallest possible size (zero members)
1676 };
1677 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1678 int index0 = index;
1679 index = skip_annotation(buffer, limit, index);
1680 u1* abase = buffer + index0;
1681 int atype = Bytes::get_Java_u2(abase + atype_off);
1682 int count = Bytes::get_Java_u2(abase + count_off);
1683 Symbol* aname = check_symbol_at(_cp, atype);
1684 if (aname == NULL) break; // invalid annotation name
1685 Symbol* member = NULL;
1686 if (count >= 1) {
1687 int member_index = Bytes::get_Java_u2(abase + member_off);
1688 member = check_symbol_at(_cp, member_index);
1689 if (member == NULL) break; // invalid member name
1690 }
1691
1692 // Here is where parsing particular annotations will take place.
1693 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1694 if (id == AnnotationCollector::_unknown) continue;
1695 coll->set_annotation(id);
1696
1697 if (id == AnnotationCollector::_jdk_internal_vm_annotation_Contended) {
1698 // @Contended can optionally specify the contention group.
1699 //
1700 // Contended group defines the equivalence class over the fields:
1701 // the fields within the same contended group are not treated distinct.
1702 // The only exception is default group, which does not incur the
1703 // equivalence. Naturally, contention group for classes is meaningless.
1704 //
1705 // While the contention group is specified as String, annotation
1706 // values are already interned, and we might as well use the constant
1707 // pool index as the group tag.
1708 //
1709 u2 group_index = 0; // default contended group
1710 if (count == 1
1711 && s_size == (index - index0) // match size
1712 && s_tag_val == *(abase + tag_off)
1713 && member == vmSymbols::value_name()) {
1714 group_index = Bytes::get_Java_u2(abase + s_con_off);
1715 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1716 group_index = 0; // default contended group
1717 }
1718 }
1719 coll->set_contended_group(group_index);
1720 }
1721 }
1722 }
1723
1724 ClassFileParser::AnnotationCollector::ID
1725 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1726 Symbol* name) {
1727 vmSymbols::SID sid = vmSymbols::find_sid(name);
1728 // Privileged code can use all annotations. Other code silently drops some.
1729 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1730 loader_data->is_ext_class_loader_data() ||
1731 loader_data->is_anonymous();
1732 switch (sid) {
1733 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1734 if (_location != _in_method) break; // only allow for methods
1735 if (!privileged) break; // only allow in privileged code
1736 return _method_CallerSensitive;
1737 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1738 if (_location != _in_method) break; // only allow for methods
1739 if (!privileged) break; // only allow in privileged code
1740 return _method_ForceInline;
1741 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1742 if (_location != _in_method) break; // only allow for methods
1743 if (!privileged) break; // only allow in privileged code
1744 return _method_DontInline;
1745 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1746 if (_location != _in_method) break; // only allow for methods
1747 if (!privileged) break; // only allow in privileged code
1748 return _method_InjectedProfile;
1749 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1750 if (_location != _in_method) break; // only allow for methods
1751 if (!privileged) break; // only allow in privileged code
1752 return _method_LambdaForm_Compiled;
1753 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1754 if (_location != _in_method) break; // only allow for methods
1755 if (!privileged) break; // only allow in privileged code
1756 return _method_LambdaForm_Hidden;
1757 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature):
1758 if (_location != _in_method) break; // only allow for methods
1759 if (!privileged) break; // only allow in privileged code
1760 return _method_HotSpotIntrinsicCandidate;
1761 #if INCLUDE_JVMCI
1762 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_Stable_signature):
1763 if (_location != _in_field) break; // only allow for fields
1764 if (!privileged) break; // only allow in privileged code
1765 return _field_Stable;
1766 #endif
1767 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1768 if (_location != _in_field) break; // only allow for fields
1769 if (!privileged) break; // only allow in privileged code
1770 return _field_Stable;
1771 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature):
1772 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1773 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1774 return _jdk_internal_vm_annotation_Contended;
1775 default: break;
1776 }
1777 return AnnotationCollector::_unknown;
1778 }
1779
1780 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1781 if (is_contended())
1782 f->set_contended_group(contended_group());
1783 if (is_stable())
1784 f->set_stable(true);
1785 }
1786
1787 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1788 // If there's an error deallocate metadata for field annotations
1789 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1790 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1791 }
1792
1793 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1794 if (has_annotation(_method_CallerSensitive))
1795 m->set_caller_sensitive(true);
1796 if (has_annotation(_method_ForceInline))
1797 m->set_force_inline(true);
1798 if (has_annotation(_method_DontInline))
1799 m->set_dont_inline(true);
1800 if (has_annotation(_method_InjectedProfile))
1801 m->set_has_injected_profile(true);
1802 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1803 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1804 if (has_annotation(_method_LambdaForm_Hidden))
1805 m->set_hidden(true);
1806 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
1807 m->set_intrinsic_candidate(true);
1808 }
1809
1810 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1811 k->set_is_contended(is_contended());
1812 }
1813
1814
1815 #define MAX_ARGS_SIZE 255
1816 #define MAX_CODE_SIZE 65535
1817 #define INITIAL_MAX_LVT_NUMBER 256
1818
1819 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1820 *
1821 * Rules for LVT's and LVTT's are:
1822 * - There can be any number of LVT's and LVTT's.
1823 * - If there are n LVT's, it is the same as if there was just
1824 * one LVT containing all the entries from the n LVT's.
1825 * - There may be no more than one LVT entry per local variable.
1826 * Two LVT entries are 'equal' if these fields are the same:
1827 * start_pc, length, name, slot
1828 * - There may be no more than one LVTT entry per each LVT entry.
1829 * Each LVTT entry has to match some LVT entry.
1830 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1831 */
1832 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1833 int lvt_cnt,
1834 u2* localvariable_table_length,
1835 u2** localvariable_table_start,
1836 int lvtt_cnt,
1837 u2* localvariable_type_table_length,
1838 u2** localvariable_type_table_start,
1839 TRAPS) {
1840
1841 ResourceMark rm(THREAD);
1842
1843 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1844 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1845
1846 LVT_HashTable* table = new LVT_HashTable();
1847
1848 // To fill LocalVariableTable in
1849 Classfile_LVT_Element* cf_lvt;
1850 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1851
1852 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1853 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1854 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1855 copy_lvt_element(&cf_lvt[idx], lvt);
1856 // If no duplicates, add LVT elem in hashtable.
1857 if (table->put(*lvt, lvt) == false
1858 && _need_verify
1859 && _major_version >= JAVA_1_5_VERSION) {
1860 classfile_parse_error("Duplicated LocalVariableTable attribute "
1861 "entry for '%s' in class file %s",
1862 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1863 CHECK);
1864 }
1865 }
1866 }
1867
1868 // To merge LocalVariableTable and LocalVariableTypeTable
1869 Classfile_LVT_Element* cf_lvtt;
1870 LocalVariableTableElement lvtt_elem;
1871
1872 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1873 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1874 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1875 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1876 LocalVariableTableElement** entry = table->get(lvtt_elem);
1877 if (entry == NULL) {
1878 if (_need_verify) {
1879 classfile_parse_error("LVTT entry for '%s' in class file %s "
1880 "does not match any LVT entry",
1881 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1882 CHECK);
1883 }
1884 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1885 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1886 "entry for '%s' in class file %s",
1887 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1888 CHECK);
1889 } else {
1890 // to add generic signatures into LocalVariableTable
1891 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1892 }
1893 }
1894 }
1895 }
1896
1897
1898 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1899 u1* runtime_visible_annotations,
1900 int runtime_visible_annotations_length,
1901 u1* runtime_invisible_annotations,
1902 int runtime_invisible_annotations_length,
1903 u1* runtime_visible_parameter_annotations,
1904 int runtime_visible_parameter_annotations_length,
1905 u1* runtime_invisible_parameter_annotations,
1906 int runtime_invisible_parameter_annotations_length,
1907 u1* runtime_visible_type_annotations,
1908 int runtime_visible_type_annotations_length,
1909 u1* runtime_invisible_type_annotations,
1910 int runtime_invisible_type_annotations_length,
1911 u1* annotation_default,
1912 int annotation_default_length,
1913 TRAPS) {
1914
1915 AnnotationArray* a;
1916
1917 if (runtime_visible_annotations_length +
1918 runtime_invisible_annotations_length > 0) {
1919 a = assemble_annotations(runtime_visible_annotations,
1920 runtime_visible_annotations_length,
1921 runtime_invisible_annotations,
1922 runtime_invisible_annotations_length,
1923 CHECK);
1924 cm->set_method_annotations(a);
1925 }
1926
1927 if (runtime_visible_parameter_annotations_length +
1928 runtime_invisible_parameter_annotations_length > 0) {
1929 a = assemble_annotations(runtime_visible_parameter_annotations,
1930 runtime_visible_parameter_annotations_length,
1931 runtime_invisible_parameter_annotations,
1932 runtime_invisible_parameter_annotations_length,
1933 CHECK);
1934 cm->set_parameter_annotations(a);
1935 }
1936
1937 if (annotation_default_length > 0) {
1938 a = assemble_annotations(annotation_default,
1939 annotation_default_length,
1940 NULL,
1941 0,
1942 CHECK);
1943 cm->set_default_annotations(a);
1944 }
1945
1946 if (runtime_visible_type_annotations_length +
1947 runtime_invisible_type_annotations_length > 0) {
1948 a = assemble_annotations(runtime_visible_type_annotations,
1949 runtime_visible_type_annotations_length,
1950 runtime_invisible_type_annotations,
1951 runtime_invisible_type_annotations_length,
1952 CHECK);
1953 cm->set_type_annotations(a);
1954 }
1955 }
1956
1957
1958 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1959 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1960 // Method* to save footprint, so we only know the size of the resulting Method* when the
1961 // entire method attribute is parsed.
1962 //
1963 // The promoted_flags parameter is used to pass relevant access_flags
1964 // from the method back up to the containing klass. These flag values
1965 // are added to klass's access_flags.
1966
1967 methodHandle ClassFileParser::parse_method(bool is_interface,
1968 AccessFlags *promoted_flags,
1969 TRAPS) {
1970 ClassFileStream* cfs = stream();
1971 methodHandle nullHandle;
1972 ResourceMark rm(THREAD);
1973 // Parse fixed parts
1974 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1975
1976 int flags = cfs->get_u2_fast();
1977 u2 name_index = cfs->get_u2_fast();
1978 int cp_size = _cp->length();
1979 check_property(
1980 valid_symbol_at(name_index),
1981 "Illegal constant pool index %u for method name in class file %s",
1982 name_index, CHECK_(nullHandle));
1983 Symbol* name = _cp->symbol_at(name_index);
1984 verify_legal_method_name(name, CHECK_(nullHandle));
1985
1986 u2 signature_index = cfs->get_u2_fast();
1987 guarantee_property(
1988 valid_symbol_at(signature_index),
1989 "Illegal constant pool index %u for method signature in class file %s",
1990 signature_index, CHECK_(nullHandle));
1991 Symbol* signature = _cp->symbol_at(signature_index);
1992
1993 AccessFlags access_flags;
1994 if (name == vmSymbols::class_initializer_name()) {
1995 // We ignore the other access flags for a valid class initializer.
1996 // (JVM Spec 2nd ed., chapter 4.6)
1997 if (_major_version < 51) { // backward compatibility
1998 flags = JVM_ACC_STATIC;
1999 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2000 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2001 } else {
2002 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_(nullHandle));
2003 }
2004 } else {
2005 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2006 }
2007
2008 if (name == vmSymbols::object_initializer_name() && is_interface) {
2009 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_(nullHandle));
2010 }
2011
2012 int args_size = -1; // only used when _need_verify is true
2013 if (_need_verify) {
2014 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2015 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2016 if (args_size > MAX_ARGS_SIZE) {
2017 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2018 }
2019 }
2020
2021 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2022
2023 // Default values for code and exceptions attribute elements
2024 u2 max_stack = 0;
2025 u2 max_locals = 0;
2026 u4 code_length = 0;
2027 u1* code_start = 0;
2028 u2 exception_table_length = 0;
2029 u2* exception_table_start = NULL;
2030 Array<int>* exception_handlers = Universe::the_empty_int_array();
2031 u2 checked_exceptions_length = 0;
2032 u2* checked_exceptions_start = NULL;
2033 CompressedLineNumberWriteStream* linenumber_table = NULL;
2034 int linenumber_table_length = 0;
2035 int total_lvt_length = 0;
2036 u2 lvt_cnt = 0;
2037 u2 lvtt_cnt = 0;
2038 bool lvt_allocated = false;
2039 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2040 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2041 u2* localvariable_table_length = NULL;
2042 u2** localvariable_table_start = NULL;
2043 u2* localvariable_type_table_length = NULL;
2044 u2** localvariable_type_table_start = NULL;
2045 int method_parameters_length = -1;
2046 u1* method_parameters_data = NULL;
2047 bool method_parameters_seen = false;
2048 bool parsed_code_attribute = false;
2049 bool parsed_checked_exceptions_attribute = false;
2050 bool parsed_stackmap_attribute = false;
2051 // stackmap attribute - JDK1.5
2052 u1* stackmap_data = NULL;
2053 int stackmap_data_length = 0;
2054 u2 generic_signature_index = 0;
2055 MethodAnnotationCollector parsed_annotations;
2056 u1* runtime_visible_annotations = NULL;
2057 int runtime_visible_annotations_length = 0;
2058 u1* runtime_invisible_annotations = NULL;
2059 int runtime_invisible_annotations_length = 0;
2060 u1* runtime_visible_parameter_annotations = NULL;
2061 int runtime_visible_parameter_annotations_length = 0;
2062 u1* runtime_invisible_parameter_annotations = NULL;
2063 int runtime_invisible_parameter_annotations_length = 0;
2064 u1* runtime_visible_type_annotations = NULL;
2065 int runtime_visible_type_annotations_length = 0;
2066 u1* runtime_invisible_type_annotations = NULL;
2067 int runtime_invisible_type_annotations_length = 0;
2068 bool runtime_invisible_annotations_exists = false;
2069 bool runtime_invisible_type_annotations_exists = false;
2070 bool runtime_invisible_parameter_annotations_exists = false;
2071 u1* annotation_default = NULL;
2072 int annotation_default_length = 0;
2073
2074 // Parse code and exceptions attribute
2075 u2 method_attributes_count = cfs->get_u2_fast();
2076 while (method_attributes_count--) {
2077 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2078 u2 method_attribute_name_index = cfs->get_u2_fast();
2079 u4 method_attribute_length = cfs->get_u4_fast();
2080 check_property(
2081 valid_symbol_at(method_attribute_name_index),
2082 "Invalid method attribute name index %u in class file %s",
2083 method_attribute_name_index, CHECK_(nullHandle));
2084
2085 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2086 if (method_attribute_name == vmSymbols::tag_code()) {
2087 // Parse Code attribute
2088 if (_need_verify) {
2089 guarantee_property(
2090 !access_flags.is_native() && !access_flags.is_abstract(),
2091 "Code attribute in native or abstract methods in class file %s",
2092 CHECK_(nullHandle));
2093 }
2094 if (parsed_code_attribute) {
2095 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2096 }
2097 parsed_code_attribute = true;
2098
2099 // Stack size, locals size, and code size
2100 if (_major_version == 45 && _minor_version <= 2) {
2101 cfs->guarantee_more(4, CHECK_(nullHandle));
2102 max_stack = cfs->get_u1_fast();
2103 max_locals = cfs->get_u1_fast();
2104 code_length = cfs->get_u2_fast();
2105 } else {
2106 cfs->guarantee_more(8, CHECK_(nullHandle));
2107 max_stack = cfs->get_u2_fast();
2108 max_locals = cfs->get_u2_fast();
2109 code_length = cfs->get_u4_fast();
2110 }
2111 if (_need_verify) {
2112 guarantee_property(args_size <= max_locals,
2113 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2114 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2115 "Invalid method Code length %u in class file %s",
2116 code_length, CHECK_(nullHandle));
2117 }
2118 // Code pointer
2119 code_start = cfs->get_u1_buffer();
2120 assert(code_start != NULL, "null code start");
2121 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2122 cfs->skip_u1_fast(code_length);
2123
2124 // Exception handler table
2125 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2126 exception_table_length = cfs->get_u2_fast();
2127 if (exception_table_length > 0) {
2128 exception_table_start =
2129 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2130 }
2131
2132 // Parse additional attributes in code attribute
2133 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2134 u2 code_attributes_count = cfs->get_u2_fast();
2135
2136 unsigned int calculated_attribute_length = 0;
2137
2138 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2139 calculated_attribute_length =
2140 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2141 } else {
2142 // max_stack, locals and length are smaller in pre-version 45.2 classes
2143 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2144 }
2145 calculated_attribute_length +=
2146 code_length +
2147 sizeof(exception_table_length) +
2148 sizeof(code_attributes_count) +
2149 exception_table_length *
2150 ( sizeof(u2) + // start_pc
2151 sizeof(u2) + // end_pc
2152 sizeof(u2) + // handler_pc
2153 sizeof(u2) ); // catch_type_index
2154
2155 while (code_attributes_count--) {
2156 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2157 u2 code_attribute_name_index = cfs->get_u2_fast();
2158 u4 code_attribute_length = cfs->get_u4_fast();
2159 calculated_attribute_length += code_attribute_length +
2160 sizeof(code_attribute_name_index) +
2161 sizeof(code_attribute_length);
2162 check_property(valid_symbol_at(code_attribute_name_index),
2163 "Invalid code attribute name index %u in class file %s",
2164 code_attribute_name_index,
2165 CHECK_(nullHandle));
2166 if (LoadLineNumberTables &&
2167 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2168 // Parse and compress line number table
2169 parse_linenumber_table(code_attribute_length, code_length,
2170 &linenumber_table, CHECK_(nullHandle));
2171
2172 } else if (LoadLocalVariableTables &&
2173 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2174 // Parse local variable table
2175 if (!lvt_allocated) {
2176 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2177 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2178 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2179 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2180 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2181 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2182 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2183 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2184 lvt_allocated = true;
2185 }
2186 if (lvt_cnt == max_lvt_cnt) {
2187 max_lvt_cnt <<= 1;
2188 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2189 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2190 }
2191 localvariable_table_start[lvt_cnt] =
2192 parse_localvariable_table(code_length,
2193 max_locals,
2194 code_attribute_length,
2195 &localvariable_table_length[lvt_cnt],
2196 false, // is not LVTT
2197 CHECK_(nullHandle));
2198 total_lvt_length += localvariable_table_length[lvt_cnt];
2199 lvt_cnt++;
2200 } else if (LoadLocalVariableTypeTables &&
2201 _major_version >= JAVA_1_5_VERSION &&
2202 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2203 if (!lvt_allocated) {
2204 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2205 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2206 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2207 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2208 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2209 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2210 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2211 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2212 lvt_allocated = true;
2213 }
2214 // Parse local variable type table
2215 if (lvtt_cnt == max_lvtt_cnt) {
2216 max_lvtt_cnt <<= 1;
2217 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2218 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2219 }
2220 localvariable_type_table_start[lvtt_cnt] =
2221 parse_localvariable_table(code_length,
2222 max_locals,
2223 code_attribute_length,
2224 &localvariable_type_table_length[lvtt_cnt],
2225 true, // is LVTT
2226 CHECK_(nullHandle));
2227 lvtt_cnt++;
2228 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2229 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2230 // Stack map is only needed by the new verifier in JDK1.5.
2231 if (parsed_stackmap_attribute) {
2232 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2233 }
2234 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2235 stackmap_data_length = code_attribute_length;
2236 parsed_stackmap_attribute = true;
2237 } else {
2238 // Skip unknown attributes
2239 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2240 }
2241 }
2242 // check method attribute length
2243 if (_need_verify) {
2244 guarantee_property(method_attribute_length == calculated_attribute_length,
2245 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2246 }
2247 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2248 // Parse Exceptions attribute
2249 if (parsed_checked_exceptions_attribute) {
2250 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2251 }
2252 parsed_checked_exceptions_attribute = true;
2253 checked_exceptions_start =
2254 parse_checked_exceptions(&checked_exceptions_length,
2255 method_attribute_length,
2256 CHECK_(nullHandle));
2257 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2258 // reject multiple method parameters
2259 if (method_parameters_seen) {
2260 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2261 }
2262 method_parameters_seen = true;
2263 method_parameters_length = cfs->get_u1_fast();
2264 const u2 real_length = (method_parameters_length * 4u) + 1u;
2265 if (method_attribute_length != real_length) {
2266 classfile_parse_error(
2267 "Invalid MethodParameters method attribute length %u in class file",
2268 method_attribute_length, CHECK_(nullHandle));
2269 }
2270 method_parameters_data = cfs->get_u1_buffer();
2271 cfs->skip_u2_fast(method_parameters_length);
2272 cfs->skip_u2_fast(method_parameters_length);
2273 // ignore this attribute if it cannot be reflected
2274 if (!SystemDictionary::Parameter_klass_loaded())
2275 method_parameters_length = -1;
2276 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2277 if (method_attribute_length != 0) {
2278 classfile_parse_error(
2279 "Invalid Synthetic method attribute length %u in class file %s",
2280 method_attribute_length, CHECK_(nullHandle));
2281 }
2282 // Should we check that there hasn't already been a synthetic attribute?
2283 access_flags.set_is_synthetic();
2284 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2285 if (method_attribute_length != 0) {
2286 classfile_parse_error(
2287 "Invalid Deprecated method attribute length %u in class file %s",
2288 method_attribute_length, CHECK_(nullHandle));
2289 }
2290 } else if (_major_version >= JAVA_1_5_VERSION) {
2291 if (method_attribute_name == vmSymbols::tag_signature()) {
2292 if (method_attribute_length != 2) {
2293 classfile_parse_error(
2294 "Invalid Signature attribute length %u in class file %s",
2295 method_attribute_length, CHECK_(nullHandle));
2296 }
2297 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2298 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2299 if (runtime_visible_annotations != NULL) {
2300 classfile_parse_error(
2301 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2302 }
2303 runtime_visible_annotations_length = method_attribute_length;
2304 runtime_visible_annotations = cfs->get_u1_buffer();
2305 assert(runtime_visible_annotations != NULL, "null visible annotations");
2306 parse_annotations(runtime_visible_annotations,
2307 runtime_visible_annotations_length, &parsed_annotations);
2308 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2309 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2310 if (runtime_invisible_annotations_exists) {
2311 classfile_parse_error(
2312 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2313 }
2314 runtime_invisible_annotations_exists = true;
2315 if (PreserveAllAnnotations) {
2316 runtime_invisible_annotations_length = method_attribute_length;
2317 runtime_invisible_annotations = cfs->get_u1_buffer();
2318 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2319 }
2320 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2321 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2322 if (runtime_visible_parameter_annotations != NULL) {
2323 classfile_parse_error(
2324 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2325 }
2326 runtime_visible_parameter_annotations_length = method_attribute_length;
2327 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2328 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2329 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2330 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2331 if (runtime_invisible_parameter_annotations_exists) {
2332 classfile_parse_error(
2333 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2334 }
2335 runtime_invisible_parameter_annotations_exists = true;
2336 if (PreserveAllAnnotations) {
2337 runtime_invisible_parameter_annotations_length = method_attribute_length;
2338 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2339 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2340 }
2341 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2342 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2343 if (annotation_default != NULL) {
2344 classfile_parse_error(
2345 "Multiple AnnotationDefault attributes for method in class file %s",
2346 CHECK_(nullHandle));
2347 }
2348 annotation_default_length = method_attribute_length;
2349 annotation_default = cfs->get_u1_buffer();
2350 assert(annotation_default != NULL, "null annotation default");
2351 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2352 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2353 if (runtime_visible_type_annotations != NULL) {
2354 classfile_parse_error(
2355 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2356 CHECK_(nullHandle));
2357 }
2358 runtime_visible_type_annotations_length = method_attribute_length;
2359 runtime_visible_type_annotations = cfs->get_u1_buffer();
2360 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2361 // No need for the VM to parse Type annotations
2362 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2363 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2364 if (runtime_invisible_type_annotations_exists) {
2365 classfile_parse_error(
2366 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2367 CHECK_(nullHandle));
2368 } else {
2369 runtime_invisible_type_annotations_exists = true;
2370 }
2371 if (PreserveAllAnnotations) {
2372 runtime_invisible_type_annotations_length = method_attribute_length;
2373 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2374 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2375 }
2376 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2377 } else {
2378 // Skip unknown attributes
2379 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2380 }
2381 } else {
2382 // Skip unknown attributes
2383 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2384 }
2385 }
2386
2387 if (linenumber_table != NULL) {
2388 linenumber_table->write_terminator();
2389 linenumber_table_length = linenumber_table->position();
2390 }
2391
2392 // Make sure there's at least one Code attribute in non-native/non-abstract method
2393 if (_need_verify) {
2394 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2395 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2396 }
2397
2398 // All sizing information for a Method* is finally available, now create it
2399 InlineTableSizes sizes(
2400 total_lvt_length,
2401 linenumber_table_length,
2402 exception_table_length,
2403 checked_exceptions_length,
2404 method_parameters_length,
2405 generic_signature_index,
2406 runtime_visible_annotations_length +
2407 runtime_invisible_annotations_length,
2408 runtime_visible_parameter_annotations_length +
2409 runtime_invisible_parameter_annotations_length,
2410 runtime_visible_type_annotations_length +
2411 runtime_invisible_type_annotations_length,
2412 annotation_default_length,
2413 0);
2414
2415 Method* m = Method::allocate(
2416 _loader_data, code_length, access_flags, &sizes,
2417 ConstMethod::NORMAL, CHECK_(nullHandle));
2418
2419 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2420
2421 // Fill in information from fixed part (access_flags already set)
2422 m->set_constants(_cp);
2423 m->set_name_index(name_index);
2424 m->set_signature_index(signature_index);
2425 #ifdef CC_INTERP
2426 // hmm is there a gc issue here??
2427 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2428 m->set_result_index(rtf.type());
2429 #endif
2430
2431 if (args_size >= 0) {
2432 m->set_size_of_parameters(args_size);
2433 } else {
2434 m->compute_size_of_parameters(THREAD);
2435 }
2436 #ifdef ASSERT
2437 if (args_size >= 0) {
2438 m->compute_size_of_parameters(THREAD);
2439 assert(args_size == m->size_of_parameters(), "");
2440 }
2441 #endif
2442
2443 // Fill in code attribute information
2444 m->set_max_stack(max_stack);
2445 m->set_max_locals(max_locals);
2446 if (stackmap_data != NULL) {
2447 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2448 stackmap_data_length, CHECK_NULL);
2449 }
2450
2451 // Copy byte codes
2452 m->set_code(code_start);
2453
2454 // Copy line number table
2455 if (linenumber_table != NULL) {
2456 memcpy(m->compressed_linenumber_table(),
2457 linenumber_table->buffer(), linenumber_table_length);
2458 }
2459
2460 // Copy exception table
2461 if (exception_table_length > 0) {
2462 int size =
2463 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2464 copy_u2_with_conversion((u2*) m->exception_table_start(),
2465 exception_table_start, size);
2466 }
2467
2468 // Copy method parameters
2469 if (method_parameters_length > 0) {
2470 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2471 for (int i = 0; i < method_parameters_length; i++) {
2472 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2473 method_parameters_data += 2;
2474 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2475 method_parameters_data += 2;
2476 }
2477 }
2478
2479 // Copy checked exceptions
2480 if (checked_exceptions_length > 0) {
2481 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2482 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2483 }
2484
2485 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2486 if (total_lvt_length > 0) {
2487 promoted_flags->set_has_localvariable_table();
2488 copy_localvariable_table(m->constMethod(), lvt_cnt,
2489 localvariable_table_length,
2490 localvariable_table_start,
2491 lvtt_cnt,
2492 localvariable_type_table_length,
2493 localvariable_type_table_start, CHECK_NULL);
2494 }
2495
2496 if (parsed_annotations.has_any_annotations())
2497 parsed_annotations.apply_to(m);
2498
2499 // Copy annotations
2500 copy_method_annotations(m->constMethod(),
2501 runtime_visible_annotations,
2502 runtime_visible_annotations_length,
2503 runtime_invisible_annotations,
2504 runtime_invisible_annotations_length,
2505 runtime_visible_parameter_annotations,
2506 runtime_visible_parameter_annotations_length,
2507 runtime_invisible_parameter_annotations,
2508 runtime_invisible_parameter_annotations_length,
2509 runtime_visible_type_annotations,
2510 runtime_visible_type_annotations_length,
2511 runtime_invisible_type_annotations,
2512 runtime_invisible_type_annotations_length,
2513 annotation_default,
2514 annotation_default_length,
2515 CHECK_NULL);
2516
2517 if (name == vmSymbols::finalize_method_name() &&
2518 signature == vmSymbols::void_method_signature()) {
2519 if (m->is_empty_method()) {
2520 _has_empty_finalizer = true;
2521 } else {
2522 _has_finalizer = true;
2523 }
2524 }
2525 if (name == vmSymbols::object_initializer_name() &&
2526 signature == vmSymbols::void_method_signature() &&
2527 m->is_vanilla_constructor()) {
2528 _has_vanilla_constructor = true;
2529 }
2530
2531 NOT_PRODUCT(m->verify());
2532 return m;
2533 }
2534
2535
2536 // The promoted_flags parameter is used to pass relevant access_flags
2537 // from the methods back up to the containing klass. These flag values
2538 // are added to klass's access_flags.
2539
2540 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2541 AccessFlags* promoted_flags,
2542 bool* has_final_method,
2543 bool* declares_default_methods,
2544 TRAPS) {
2545 ClassFileStream* cfs = stream();
2546 cfs->guarantee_more(2, CHECK_NULL); // length
2547 u2 length = cfs->get_u2_fast();
2548 if (length == 0) {
2549 _methods = Universe::the_empty_method_array();
2550 } else {
2551 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2552
2553 HandleMark hm(THREAD);
2554 for (int index = 0; index < length; index++) {
2555 methodHandle method = parse_method(is_interface,
2556 promoted_flags,
2557 CHECK_NULL);
2558
2559 if (method->is_final()) {
2560 *has_final_method = true;
2561 }
2562 // declares_default_methods: declares concrete instance methods, any access flags
2563 // used for interface initialization, and default method inheritance analysis
2564 if (is_interface && !(*declares_default_methods)
2565 && !method->is_abstract() && !method->is_static()) {
2566 *declares_default_methods = true;
2567 }
2568 _methods->at_put(index, method());
2569 }
2570
2571 if (_need_verify && length > 1) {
2572 // Check duplicated methods
2573 ResourceMark rm(THREAD);
2574 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2575 THREAD, NameSigHash*, HASH_ROW_SIZE);
2576 initialize_hashtable(names_and_sigs);
2577 bool dup = false;
2578 {
2579 debug_only(No_Safepoint_Verifier nsv;)
2580 for (int i = 0; i < length; i++) {
2581 Method* m = _methods->at(i);
2582 // If no duplicates, add name/signature in hashtable names_and_sigs.
2583 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2584 dup = true;
2585 break;
2586 }
2587 }
2588 }
2589 if (dup) {
2590 classfile_parse_error("Duplicate method name&signature in class file %s",
2591 CHECK_NULL);
2592 }
2593 }
2594 }
2595 return _methods;
2596 }
2597
2598
2599 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2600 int length = methods->length();
2601 // If JVMTI original method ordering or sharing is enabled we have to
2602 // remember the original class file ordering.
2603 // We temporarily use the vtable_index field in the Method* to store the
2604 // class file index, so we can read in after calling qsort.
2605 // Put the method ordering in the shared archive.
2606 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2607 for (int index = 0; index < length; index++) {
2608 Method* m = methods->at(index);
2609 assert(!m->valid_vtable_index(), "vtable index should not be set");
2610 m->set_vtable_index(index);
2611 }
2612 }
2613 // Sort method array by ascending method name (for faster lookups & vtable construction)
2614 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2615 Method::sort_methods(methods);
2616
2617 intArray* method_ordering = NULL;
2618 // If JVMTI original method ordering or sharing is enabled construct int
2619 // array remembering the original ordering
2620 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2621 method_ordering = new intArray(length);
2622 for (int index = 0; index < length; index++) {
2623 Method* m = methods->at(index);
2624 int old_index = m->vtable_index();
2625 assert(old_index >= 0 && old_index < length, "invalid method index");
2626 method_ordering->at_put(index, old_index);
2627 m->set_vtable_index(Method::invalid_vtable_index);
2628 }
2629 }
2630 return method_ordering;
2631 }
2632
2633 // Parse generic_signature attribute for methods and fields
2634 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2635 ClassFileStream* cfs = stream();
2636 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2637 u2 generic_signature_index = cfs->get_u2_fast();
2638 check_property(
2639 valid_symbol_at(generic_signature_index),
2640 "Invalid Signature attribute at constant pool index %u in class file %s",
2641 generic_signature_index, CHECK_0);
2642 return generic_signature_index;
2643 }
2644
2645 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2646 ClassFileStream* cfs = stream();
2647 cfs->guarantee_more(2, CHECK); // sourcefile_index
2648 u2 sourcefile_index = cfs->get_u2_fast();
2649 check_property(
2650 valid_symbol_at(sourcefile_index),
2651 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2652 sourcefile_index, CHECK);
2653 set_class_sourcefile_index(sourcefile_index);
2654 }
2655
2656
2657
2658 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2659 ClassFileStream* cfs = stream();
2660 u1* sde_buffer = cfs->get_u1_buffer();
2661 assert(sde_buffer != NULL, "null sde buffer");
2662
2663 // Don't bother storing it if there is no way to retrieve it
2664 if (JvmtiExport::can_get_source_debug_extension()) {
2665 assert((length+1) > length, "Overflow checking");
2666 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2667 for (int i = 0; i < length; i++) {
2668 sde[i] = sde_buffer[i];
2669 }
2670 sde[length] = '\0';
2671 set_class_sde_buffer((char*)sde, length);
2672 }
2673 // Got utf8 string, set stream position forward
2674 cfs->skip_u1(length, CHECK);
2675 }
2676
2677
2678 // Inner classes can be static, private or protected (classic VM does this)
2679 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2680
2681 // Return number of classes in the inner classes attribute table
2682 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2683 bool parsed_enclosingmethod_attribute,
2684 u2 enclosing_method_class_index,
2685 u2 enclosing_method_method_index,
2686 TRAPS) {
2687 ClassFileStream* cfs = stream();
2688 u1* current_mark = cfs->current();
2689 u2 length = 0;
2690 if (inner_classes_attribute_start != NULL) {
2691 cfs->set_current(inner_classes_attribute_start);
2692 cfs->guarantee_more(2, CHECK_0); // length
2693 length = cfs->get_u2_fast();
2694 }
2695
2696 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2697 // method data:
2698 // [inner_class_info_index,
2699 // outer_class_info_index,
2700 // inner_name_index,
2701 // inner_class_access_flags,
2702 // ...
2703 // enclosing_method_class_index,
2704 // enclosing_method_method_index]
2705 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2706 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2707 _inner_classes = inner_classes;
2708
2709 int index = 0;
2710 int cp_size = _cp->length();
2711 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2712 for (int n = 0; n < length; n++) {
2713 // Inner class index
2714 u2 inner_class_info_index = cfs->get_u2_fast();
2715 check_property(
2716 valid_klass_reference_at(inner_class_info_index),
2717 "inner_class_info_index %u has bad constant type in class file %s",
2718 inner_class_info_index, CHECK_0);
2719 // Outer class index
2720 u2 outer_class_info_index = cfs->get_u2_fast();
2721 check_property(
2722 outer_class_info_index == 0 ||
2723 valid_klass_reference_at(outer_class_info_index),
2724 "outer_class_info_index %u has bad constant type in class file %s",
2725 outer_class_info_index, CHECK_0);
2726 // Inner class name
2727 u2 inner_name_index = cfs->get_u2_fast();
2728 check_property(
2729 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2730 "inner_name_index %u has bad constant type in class file %s",
2731 inner_name_index, CHECK_0);
2732 if (_need_verify) {
2733 guarantee_property(inner_class_info_index != outer_class_info_index,
2734 "Class is both outer and inner class in class file %s", CHECK_0);
2735 }
2736 // Access flags
2737 AccessFlags inner_access_flags;
2738 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2739 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2740 // Set abstract bit for old class files for backward compatibility
2741 flags |= JVM_ACC_ABSTRACT;
2742 }
2743 verify_legal_class_modifiers(flags, CHECK_0);
2744 inner_access_flags.set_flags(flags);
2745
2746 inner_classes->at_put(index++, inner_class_info_index);
2747 inner_classes->at_put(index++, outer_class_info_index);
2748 inner_classes->at_put(index++, inner_name_index);
2749 inner_classes->at_put(index++, inner_access_flags.as_short());
2750 }
2751
2752 // 4347400: make sure there's no duplicate entry in the classes array
2753 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2754 for(int i = 0; i < length * 4; i += 4) {
2755 for(int j = i + 4; j < length * 4; j += 4) {
2756 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2757 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2758 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2759 inner_classes->at(i+3) != inner_classes->at(j+3)),
2760 "Duplicate entry in InnerClasses in class file %s",
2761 CHECK_0);
2762 }
2763 }
2764 }
2765
2766 // Set EnclosingMethod class and method indexes.
2767 if (parsed_enclosingmethod_attribute) {
2768 inner_classes->at_put(index++, enclosing_method_class_index);
2769 inner_classes->at_put(index++, enclosing_method_method_index);
2770 }
2771 assert(index == size, "wrong size");
2772
2773 // Restore buffer's current position.
2774 cfs->set_current(current_mark);
2775
2776 return length;
2777 }
2778
2779 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2780 set_class_synthetic_flag(true);
2781 }
2782
2783 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2784 ClassFileStream* cfs = stream();
2785 u2 signature_index = cfs->get_u2(CHECK);
2786 check_property(
2787 valid_symbol_at(signature_index),
2788 "Invalid constant pool index %u in Signature attribute in class file %s",
2789 signature_index, CHECK);
2790 set_class_generic_signature_index(signature_index);
2791 }
2792
2793 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2794 ClassFileStream* cfs = stream();
2795 u1* current_start = cfs->current();
2796
2797 guarantee_property(attribute_byte_length >= sizeof(u2),
2798 "Invalid BootstrapMethods attribute length %u in class file %s",
2799 attribute_byte_length,
2800 CHECK);
2801
2802 cfs->guarantee_more(attribute_byte_length, CHECK);
2803
2804 int attribute_array_length = cfs->get_u2_fast();
2805
2806 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2807 "Short length on BootstrapMethods in class file %s",
2808 CHECK);
2809
2810
2811 // The attribute contains a counted array of counted tuples of shorts,
2812 // represending bootstrap specifiers:
2813 // length*{bootstrap_method_index, argument_count*{argument_index}}
2814 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2815 // operand_count = number of shorts in attr, except for leading length
2816
2817 // The attribute is copied into a short[] array.
2818 // The array begins with a series of short[2] pairs, one for each tuple.
2819 int index_size = (attribute_array_length * 2);
2820
2821 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2822
2823 // Eagerly assign operands so they will be deallocated with the constant
2824 // pool if there is an error.
2825 _cp->set_operands(operands);
2826
2827 int operand_fill_index = index_size;
2828 int cp_size = _cp->length();
2829
2830 for (int n = 0; n < attribute_array_length; n++) {
2831 // Store a 32-bit offset into the header of the operand array.
2832 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2833
2834 // Read a bootstrap specifier.
2835 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2836 u2 bootstrap_method_index = cfs->get_u2_fast();
2837 u2 argument_count = cfs->get_u2_fast();
2838 check_property(
2839 valid_cp_range(bootstrap_method_index, cp_size) &&
2840 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2841 "bootstrap_method_index %u has bad constant type in class file %s",
2842 bootstrap_method_index,
2843 CHECK);
2844
2845 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2846 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2847 CHECK);
2848
2849 operands->at_put(operand_fill_index++, bootstrap_method_index);
2850 operands->at_put(operand_fill_index++, argument_count);
2851
2852 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2853 for (int j = 0; j < argument_count; j++) {
2854 u2 argument_index = cfs->get_u2_fast();
2855 check_property(
2856 valid_cp_range(argument_index, cp_size) &&
2857 _cp->tag_at(argument_index).is_loadable_constant(),
2858 "argument_index %u has bad constant type in class file %s",
2859 argument_index,
2860 CHECK);
2861 operands->at_put(operand_fill_index++, argument_index);
2862 }
2863 }
2864
2865 u1* current_end = cfs->current();
2866 guarantee_property(current_end == current_start + attribute_byte_length,
2867 "Bad length on BootstrapMethods in class file %s",
2868 CHECK);
2869 }
2870
2871 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2872 TRAPS) {
2873 ClassFileStream* cfs = stream();
2874 // Set inner classes attribute to default sentinel
2875 _inner_classes = Universe::the_empty_short_array();
2876 cfs->guarantee_more(2, CHECK); // attributes_count
2877 u2 attributes_count = cfs->get_u2_fast();
2878 bool parsed_sourcefile_attribute = false;
2879 bool parsed_innerclasses_attribute = false;
2880 bool parsed_enclosingmethod_attribute = false;
2881 bool parsed_bootstrap_methods_attribute = false;
2882 u1* runtime_visible_annotations = NULL;
2883 int runtime_visible_annotations_length = 0;
2884 u1* runtime_invisible_annotations = NULL;
2885 int runtime_invisible_annotations_length = 0;
2886 u1* runtime_visible_type_annotations = NULL;
2887 int runtime_visible_type_annotations_length = 0;
2888 u1* runtime_invisible_type_annotations = NULL;
2889 int runtime_invisible_type_annotations_length = 0;
2890 bool runtime_invisible_type_annotations_exists = false;
2891 bool runtime_invisible_annotations_exists = false;
2892 bool parsed_source_debug_ext_annotations_exist = false;
2893 u1* inner_classes_attribute_start = NULL;
2894 u4 inner_classes_attribute_length = 0;
2895 u2 enclosing_method_class_index = 0;
2896 u2 enclosing_method_method_index = 0;
2897 // Iterate over attributes
2898 while (attributes_count--) {
2899 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2900 u2 attribute_name_index = cfs->get_u2_fast();
2901 u4 attribute_length = cfs->get_u4_fast();
2902 check_property(
2903 valid_symbol_at(attribute_name_index),
2904 "Attribute name has bad constant pool index %u in class file %s",
2905 attribute_name_index, CHECK);
2906 Symbol* tag = _cp->symbol_at(attribute_name_index);
2907 if (tag == vmSymbols::tag_source_file()) {
2908 // Check for SourceFile tag
2909 if (_need_verify) {
2910 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2911 }
2912 if (parsed_sourcefile_attribute) {
2913 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2914 } else {
2915 parsed_sourcefile_attribute = true;
2916 }
2917 parse_classfile_sourcefile_attribute(CHECK);
2918 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2919 // Check for SourceDebugExtension tag
2920 if (parsed_source_debug_ext_annotations_exist) {
2921 classfile_parse_error(
2922 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2923 }
2924 parsed_source_debug_ext_annotations_exist = true;
2925 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2926 } else if (tag == vmSymbols::tag_inner_classes()) {
2927 // Check for InnerClasses tag
2928 if (parsed_innerclasses_attribute) {
2929 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2930 } else {
2931 parsed_innerclasses_attribute = true;
2932 }
2933 inner_classes_attribute_start = cfs->get_u1_buffer();
2934 inner_classes_attribute_length = attribute_length;
2935 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2936 } else if (tag == vmSymbols::tag_synthetic()) {
2937 // Check for Synthetic tag
2938 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2939 if (attribute_length != 0) {
2940 classfile_parse_error(
2941 "Invalid Synthetic classfile attribute length %u in class file %s",
2942 attribute_length, CHECK);
2943 }
2944 parse_classfile_synthetic_attribute(CHECK);
2945 } else if (tag == vmSymbols::tag_deprecated()) {
2946 // Check for Deprecatd tag - 4276120
2947 if (attribute_length != 0) {
2948 classfile_parse_error(
2949 "Invalid Deprecated classfile attribute length %u in class file %s",
2950 attribute_length, CHECK);
2951 }
2952 } else if (_major_version >= JAVA_1_5_VERSION) {
2953 if (tag == vmSymbols::tag_signature()) {
2954 if (attribute_length != 2) {
2955 classfile_parse_error(
2956 "Wrong Signature attribute length %u in class file %s",
2957 attribute_length, CHECK);
2958 }
2959 parse_classfile_signature_attribute(CHECK);
2960 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2961 if (runtime_visible_annotations != NULL) {
2962 classfile_parse_error(
2963 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2964 }
2965 runtime_visible_annotations_length = attribute_length;
2966 runtime_visible_annotations = cfs->get_u1_buffer();
2967 assert(runtime_visible_annotations != NULL, "null visible annotations");
2968 parse_annotations(runtime_visible_annotations,
2969 runtime_visible_annotations_length,
2970 parsed_annotations);
2971 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2972 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2973 if (runtime_invisible_annotations_exists) {
2974 classfile_parse_error(
2975 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2976 }
2977 runtime_invisible_annotations_exists = true;
2978 if (PreserveAllAnnotations) {
2979 runtime_invisible_annotations_length = attribute_length;
2980 runtime_invisible_annotations = cfs->get_u1_buffer();
2981 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2982 }
2983 cfs->skip_u1(attribute_length, CHECK);
2984 } else if (tag == vmSymbols::tag_enclosing_method()) {
2985 if (parsed_enclosingmethod_attribute) {
2986 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2987 } else {
2988 parsed_enclosingmethod_attribute = true;
2989 }
2990 guarantee_property(attribute_length == 4,
2991 "Wrong EnclosingMethod attribute length %u in class file %s",
2992 attribute_length, CHECK);
2993 cfs->guarantee_more(4, CHECK); // class_index, method_index
2994 enclosing_method_class_index = cfs->get_u2_fast();
2995 enclosing_method_method_index = cfs->get_u2_fast();
2996 if (enclosing_method_class_index == 0) {
2997 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2998 }
2999 // Validate the constant pool indices and types
3000 check_property(valid_klass_reference_at(enclosing_method_class_index),
3001 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3002 if (enclosing_method_method_index != 0 &&
3003 (!_cp->is_within_bounds(enclosing_method_method_index) ||
3004 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3005 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3006 }
3007 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3008 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3009 if (parsed_bootstrap_methods_attribute)
3010 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3011 parsed_bootstrap_methods_attribute = true;
3012 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3013 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3014 if (runtime_visible_type_annotations != NULL) {
3015 classfile_parse_error(
3016 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3017 }
3018 runtime_visible_type_annotations_length = attribute_length;
3019 runtime_visible_type_annotations = cfs->get_u1_buffer();
3020 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3021 // No need for the VM to parse Type annotations
3022 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3023 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3024 if (runtime_invisible_type_annotations_exists) {
3025 classfile_parse_error(
3026 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3027 } else {
3028 runtime_invisible_type_annotations_exists = true;
3029 }
3030 if (PreserveAllAnnotations) {
3031 runtime_invisible_type_annotations_length = attribute_length;
3032 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3033 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3034 }
3035 cfs->skip_u1(attribute_length, CHECK);
3036 } else {
3037 // Unknown attribute
3038 cfs->skip_u1(attribute_length, CHECK);
3039 }
3040 } else {
3041 // Unknown attribute
3042 cfs->skip_u1(attribute_length, CHECK);
3043 }
3044 }
3045 _annotations = assemble_annotations(runtime_visible_annotations,
3046 runtime_visible_annotations_length,
3047 runtime_invisible_annotations,
3048 runtime_invisible_annotations_length,
3049 CHECK);
3050 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3051 runtime_visible_type_annotations_length,
3052 runtime_invisible_type_annotations,
3053 runtime_invisible_type_annotations_length,
3054 CHECK);
3055
3056 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3057 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3058 inner_classes_attribute_start,
3059 parsed_innerclasses_attribute,
3060 enclosing_method_class_index,
3061 enclosing_method_method_index,
3062 CHECK);
3063 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3064 guarantee_property(
3065 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3066 "Wrong InnerClasses attribute length in class file %s", CHECK);
3067 }
3068 }
3069
3070 if (_max_bootstrap_specifier_index >= 0) {
3071 guarantee_property(parsed_bootstrap_methods_attribute,
3072 "Missing BootstrapMethods attribute in class file %s", CHECK);
3073 }
3074 }
3075
3076 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3077 if (_synthetic_flag)
3078 k->set_is_synthetic();
3079 if (_sourcefile_index != 0) {
3080 k->set_source_file_name_index(_sourcefile_index);
3081 }
3082 if (_generic_signature_index != 0) {
3083 k->set_generic_signature_index(_generic_signature_index);
3084 }
3085 if (_sde_buffer != NULL) {
3086 k->set_source_debug_extension(_sde_buffer, _sde_length);
3087 }
3088 }
3089
3090 // Create the Annotations object that will
3091 // hold the annotations array for the Klass.
3092 void ClassFileParser::create_combined_annotations(TRAPS) {
3093 if (_annotations == NULL &&
3094 _type_annotations == NULL &&
3095 _fields_annotations == NULL &&
3096 _fields_type_annotations == NULL) {
3097 // Don't create the Annotations object unnecessarily.
3098 return;
3099 }
3100
3101 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3102 annotations->set_class_annotations(_annotations);
3103 annotations->set_class_type_annotations(_type_annotations);
3104 annotations->set_fields_annotations(_fields_annotations);
3105 annotations->set_fields_type_annotations(_fields_type_annotations);
3106
3107 // This is the Annotations object that will be
3108 // assigned to InstanceKlass being constructed.
3109 _combined_annotations = annotations;
3110
3111 // The annotations arrays below has been transfered the
3112 // _combined_annotations so these fields can now be cleared.
3113 _annotations = NULL;
3114 _type_annotations = NULL;
3115 _fields_annotations = NULL;
3116 _fields_type_annotations = NULL;
3117 }
3118
3119 // Transfer ownership of metadata allocated to the InstanceKlass.
3120 void ClassFileParser::apply_parsed_class_metadata(
3121 instanceKlassHandle this_klass,
3122 int java_fields_count, TRAPS) {
3123 _cp->set_pool_holder(this_klass());
3124 this_klass->set_constants(_cp);
3125 this_klass->set_fields(_fields, java_fields_count);
3126 this_klass->set_methods(_methods);
3127 this_klass->set_inner_classes(_inner_classes);
3128 this_klass->set_local_interfaces(_local_interfaces);
3129 this_klass->set_transitive_interfaces(_transitive_interfaces);
3130 this_klass->set_annotations(_combined_annotations);
3131
3132 // Clear out these fields so they don't get deallocated by the destructor
3133 clear_class_metadata();
3134 }
3135
3136 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3137 int runtime_visible_annotations_length,
3138 u1* runtime_invisible_annotations,
3139 int runtime_invisible_annotations_length, TRAPS) {
3140 AnnotationArray* annotations = NULL;
3141 if (runtime_visible_annotations != NULL ||
3142 runtime_invisible_annotations != NULL) {
3143 annotations = MetadataFactory::new_array<u1>(_loader_data,
3144 runtime_visible_annotations_length +
3145 runtime_invisible_annotations_length,
3146 CHECK_(annotations));
3147 if (runtime_visible_annotations != NULL) {
3148 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3149 annotations->at_put(i, runtime_visible_annotations[i]);
3150 }
3151 }
3152 if (runtime_invisible_annotations != NULL) {
3153 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3154 int append = runtime_visible_annotations_length+i;
3155 annotations->at_put(append, runtime_invisible_annotations[i]);
3156 }
3157 }
3158 }
3159 return annotations;
3160 }
3161
3162 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3163 TRAPS) {
3164 instanceKlassHandle super_klass;
3165 if (super_class_index == 0) {
3166 check_property(_class_name == vmSymbols::java_lang_Object(),
3167 "Invalid superclass index %u in class file %s",
3168 super_class_index,
3169 CHECK_NULL);
3170 } else {
3171 check_property(valid_klass_reference_at(super_class_index),
3172 "Invalid superclass index %u in class file %s",
3173 super_class_index,
3174 CHECK_NULL);
3175 // The class name should be legal because it is checked when parsing constant pool.
3176 // However, make sure it is not an array type.
3177 bool is_array = false;
3178 if (_cp->tag_at(super_class_index).is_klass()) {
3179 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3180 if (_need_verify) {
3181 is_array = super_klass->is_array_klass();
3182 }
3183 } else if (_need_verify) {
3184 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3185 }
3186 if (_need_verify) {
3187 guarantee_property(!is_array,
3188 "Bad superclass name in class file %s", CHECK_NULL);
3189 }
3190 }
3191 return super_klass;
3192 }
3193
3194
3195 // Values needed for oopmap and InstanceKlass creation
3196 class FieldLayoutInfo : public StackObj {
3197 public:
3198 int* nonstatic_oop_offsets;
3199 unsigned int* nonstatic_oop_counts;
3200 unsigned int nonstatic_oop_map_count;
3201 unsigned int total_oop_map_count;
3202 int instance_size;
3203 int nonstatic_field_size;
3204 int static_field_size;
3205 bool has_nonstatic_fields;
3206 };
3207
3208 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3209 void ClassFileParser::layout_fields(Handle class_loader,
3210 FieldAllocationCount* fac,
3211 ClassAnnotationCollector* parsed_annotations,
3212 FieldLayoutInfo* info,
3213 TRAPS) {
3214
3215 // Field size and offset computation
3216 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3217 int next_static_oop_offset = 0;
3218 int next_static_double_offset = 0;
3219 int next_static_word_offset = 0;
3220 int next_static_short_offset = 0;
3221 int next_static_byte_offset = 0;
3222 int next_nonstatic_oop_offset = 0;
3223 int next_nonstatic_double_offset = 0;
3224 int next_nonstatic_word_offset = 0;
3225 int next_nonstatic_short_offset = 0;
3226 int next_nonstatic_byte_offset = 0;
3227 int first_nonstatic_oop_offset = 0;
3228 int next_nonstatic_field_offset = 0;
3229 int next_nonstatic_padded_offset = 0;
3230
3231 // Count the contended fields by type.
3232 //
3233 // We ignore static fields, because @Contended is not supported for them.
3234 // The layout code below will also ignore the static fields.
3235 int nonstatic_contended_count = 0;
3236 FieldAllocationCount fac_contended;
3237 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3238 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3239 if (fs.is_contended()) {
3240 fac_contended.count[atype]++;
3241 if (!fs.access_flags().is_static()) {
3242 nonstatic_contended_count++;
3243 }
3244 }
3245 }
3246
3247
3248 // Calculate the starting byte offsets
3249 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3250 next_static_double_offset = next_static_oop_offset +
3251 ((fac->count[STATIC_OOP]) * heapOopSize);
3252 if ( fac->count[STATIC_DOUBLE] &&
3253 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3254 Universe::field_type_should_be_aligned(T_LONG)) ) {
3255 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3256 }
3257
3258 next_static_word_offset = next_static_double_offset +
3259 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3260 next_static_short_offset = next_static_word_offset +
3261 ((fac->count[STATIC_WORD]) * BytesPerInt);
3262 next_static_byte_offset = next_static_short_offset +
3263 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3264
3265 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3266 nonstatic_field_size * heapOopSize;
3267
3268 next_nonstatic_field_offset = nonstatic_fields_start;
3269
3270 bool is_contended_class = parsed_annotations->is_contended();
3271
3272 // Class is contended, pad before all the fields
3273 if (is_contended_class) {
3274 next_nonstatic_field_offset += ContendedPaddingWidth;
3275 }
3276
3277 // Compute the non-contended fields count.
3278 // The packing code below relies on these counts to determine if some field
3279 // can be squeezed into the alignment gap. Contended fields are obviously
3280 // exempt from that.
3281 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3282 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3283 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3284 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3285 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3286
3287 // Total non-static fields count, including every contended field
3288 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3289 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3290 fac->count[NONSTATIC_OOP];
3291
3292 bool super_has_nonstatic_fields =
3293 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3294 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3295
3296
3297 // Prepare list of oops for oop map generation.
3298 //
3299 // "offset" and "count" lists are describing the set of contiguous oop
3300 // regions. offset[i] is the start of the i-th region, which then has
3301 // count[i] oops following. Before we know how many regions are required,
3302 // we pessimistically allocate the maps to fit all the oops into the
3303 // distinct regions.
3304 //
3305 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3306 // to figure out if we still need to do this.
3307 int* nonstatic_oop_offsets;
3308 unsigned int* nonstatic_oop_counts;
3309 unsigned int nonstatic_oop_map_count = 0;
3310 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3311
3312 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3313 THREAD, int, max_nonstatic_oop_maps);
3314 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3315 THREAD, unsigned int, max_nonstatic_oop_maps);
3316
3317 first_nonstatic_oop_offset = 0; // will be set for first oop field
3318
3319 bool compact_fields = CompactFields;
3320 int allocation_style = FieldsAllocationStyle;
3321 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3322 assert(false, "0 <= FieldsAllocationStyle <= 2");
3323 allocation_style = 1; // Optimistic
3324 }
3325
3326 // The next classes have predefined hard-coded fields offsets
3327 // (see in JavaClasses::compute_hard_coded_offsets()).
3328 // Use default fields allocation order for them.
3329 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3330 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3331 _class_name == vmSymbols::java_lang_Class() ||
3332 _class_name == vmSymbols::java_lang_ClassLoader() ||
3333 _class_name == vmSymbols::java_lang_ref_Reference() ||
3334 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3335 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3336 _class_name == vmSymbols::java_lang_String() ||
3337 _class_name == vmSymbols::java_lang_Throwable() ||
3338 _class_name == vmSymbols::java_lang_Boolean() ||
3339 _class_name == vmSymbols::java_lang_Character() ||
3340 _class_name == vmSymbols::java_lang_Float() ||
3341 _class_name == vmSymbols::java_lang_Double() ||
3342 _class_name == vmSymbols::java_lang_Byte() ||
3343 _class_name == vmSymbols::java_lang_Short() ||
3344 _class_name == vmSymbols::java_lang_Integer() ||
3345 _class_name == vmSymbols::java_lang_Long())) {
3346 allocation_style = 0; // Allocate oops first
3347 compact_fields = false; // Don't compact fields
3348 }
3349
3350 // Rearrange fields for a given allocation style
3351 if( allocation_style == 0 ) {
3352 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3353 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3354 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3355 (nonstatic_oop_count * heapOopSize);
3356 } else if( allocation_style == 1 ) {
3357 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3358 next_nonstatic_double_offset = next_nonstatic_field_offset;
3359 } else if( allocation_style == 2 ) {
3360 // Fields allocation: oops fields in super and sub classes are together.
3361 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3362 _super_klass->nonstatic_oop_map_size() > 0 ) {
3363 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3364 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3365 OopMapBlock* last_map = first_map + map_count - 1;
3366 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3367 if (next_offset == next_nonstatic_field_offset) {
3368 allocation_style = 0; // allocate oops first
3369 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3370 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3371 (nonstatic_oop_count * heapOopSize);
3372 }
3373 }
3374 if( allocation_style == 2 ) {
3375 allocation_style = 1; // allocate oops last
3376 next_nonstatic_double_offset = next_nonstatic_field_offset;
3377 }
3378 } else {
3379 ShouldNotReachHere();
3380 }
3381
3382 int nonstatic_oop_space_count = 0;
3383 int nonstatic_word_space_count = 0;
3384 int nonstatic_short_space_count = 0;
3385 int nonstatic_byte_space_count = 0;
3386 int nonstatic_oop_space_offset = 0;
3387 int nonstatic_word_space_offset = 0;
3388 int nonstatic_short_space_offset = 0;
3389 int nonstatic_byte_space_offset = 0;
3390
3391 // Try to squeeze some of the fields into the gaps due to
3392 // long/double alignment.
3393 if( nonstatic_double_count > 0 ) {
3394 int offset = next_nonstatic_double_offset;
3395 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3396 if( compact_fields && offset != next_nonstatic_double_offset ) {
3397 // Allocate available fields into the gap before double field.
3398 int length = next_nonstatic_double_offset - offset;
3399 assert(length == BytesPerInt, "");
3400 nonstatic_word_space_offset = offset;
3401 if( nonstatic_word_count > 0 ) {
3402 nonstatic_word_count -= 1;
3403 nonstatic_word_space_count = 1; // Only one will fit
3404 length -= BytesPerInt;
3405 offset += BytesPerInt;
3406 }
3407 nonstatic_short_space_offset = offset;
3408 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3409 nonstatic_short_count -= 1;
3410 nonstatic_short_space_count += 1;
3411 length -= BytesPerShort;
3412 offset += BytesPerShort;
3413 }
3414 nonstatic_byte_space_offset = offset;
3415 while( length > 0 && nonstatic_byte_count > 0 ) {
3416 nonstatic_byte_count -= 1;
3417 nonstatic_byte_space_count += 1;
3418 length -= 1;
3419 }
3420 // Allocate oop field in the gap if there are no other fields for that.
3421 nonstatic_oop_space_offset = offset;
3422 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3423 allocation_style != 0 ) { // when oop fields not first
3424 nonstatic_oop_count -= 1;
3425 nonstatic_oop_space_count = 1; // Only one will fit
3426 length -= heapOopSize;
3427 offset += heapOopSize;
3428 }
3429 }
3430 }
3431
3432 next_nonstatic_word_offset = next_nonstatic_double_offset +
3433 (nonstatic_double_count * BytesPerLong);
3434 next_nonstatic_short_offset = next_nonstatic_word_offset +
3435 (nonstatic_word_count * BytesPerInt);
3436 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3437 (nonstatic_short_count * BytesPerShort);
3438 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3439 nonstatic_byte_count;
3440
3441 // let oops jump before padding with this allocation style
3442 if( allocation_style == 1 ) {
3443 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3444 if( nonstatic_oop_count > 0 ) {
3445 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3446 }
3447 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3448 }
3449
3450 // Iterate over fields again and compute correct offsets.
3451 // The field allocation type was temporarily stored in the offset slot.
3452 // oop fields are located before non-oop fields (static and non-static).
3453 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3454
3455 // skip already laid out fields
3456 if (fs.is_offset_set()) continue;
3457
3458 // contended instance fields are handled below
3459 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3460
3461 int real_offset = 0;
3462 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3463
3464 // pack the rest of the fields
3465 switch (atype) {
3466 case STATIC_OOP:
3467 real_offset = next_static_oop_offset;
3468 next_static_oop_offset += heapOopSize;
3469 break;
3470 case STATIC_BYTE:
3471 real_offset = next_static_byte_offset;
3472 next_static_byte_offset += 1;
3473 break;
3474 case STATIC_SHORT:
3475 real_offset = next_static_short_offset;
3476 next_static_short_offset += BytesPerShort;
3477 break;
3478 case STATIC_WORD:
3479 real_offset = next_static_word_offset;
3480 next_static_word_offset += BytesPerInt;
3481 break;
3482 case STATIC_DOUBLE:
3483 real_offset = next_static_double_offset;
3484 next_static_double_offset += BytesPerLong;
3485 break;
3486 case NONSTATIC_OOP:
3487 if( nonstatic_oop_space_count > 0 ) {
3488 real_offset = nonstatic_oop_space_offset;
3489 nonstatic_oop_space_offset += heapOopSize;
3490 nonstatic_oop_space_count -= 1;
3491 } else {
3492 real_offset = next_nonstatic_oop_offset;
3493 next_nonstatic_oop_offset += heapOopSize;
3494 }
3495
3496 // Record this oop in the oop maps
3497 if( nonstatic_oop_map_count > 0 &&
3498 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3499 real_offset -
3500 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3501 heapOopSize ) {
3502 // This oop is adjacent to the previous one, add to current oop map
3503 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3504 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3505 } else {
3506 // This oop is not adjacent to the previous one, create new oop map
3507 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3508 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3509 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3510 nonstatic_oop_map_count += 1;
3511 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3512 first_nonstatic_oop_offset = real_offset;
3513 }
3514 }
3515 break;
3516 case NONSTATIC_BYTE:
3517 if( nonstatic_byte_space_count > 0 ) {
3518 real_offset = nonstatic_byte_space_offset;
3519 nonstatic_byte_space_offset += 1;
3520 nonstatic_byte_space_count -= 1;
3521 } else {
3522 real_offset = next_nonstatic_byte_offset;
3523 next_nonstatic_byte_offset += 1;
3524 }
3525 break;
3526 case NONSTATIC_SHORT:
3527 if( nonstatic_short_space_count > 0 ) {
3528 real_offset = nonstatic_short_space_offset;
3529 nonstatic_short_space_offset += BytesPerShort;
3530 nonstatic_short_space_count -= 1;
3531 } else {
3532 real_offset = next_nonstatic_short_offset;
3533 next_nonstatic_short_offset += BytesPerShort;
3534 }
3535 break;
3536 case NONSTATIC_WORD:
3537 if( nonstatic_word_space_count > 0 ) {
3538 real_offset = nonstatic_word_space_offset;
3539 nonstatic_word_space_offset += BytesPerInt;
3540 nonstatic_word_space_count -= 1;
3541 } else {
3542 real_offset = next_nonstatic_word_offset;
3543 next_nonstatic_word_offset += BytesPerInt;
3544 }
3545 break;
3546 case NONSTATIC_DOUBLE:
3547 real_offset = next_nonstatic_double_offset;
3548 next_nonstatic_double_offset += BytesPerLong;
3549 break;
3550 default:
3551 ShouldNotReachHere();
3552 }
3553 fs.set_offset(real_offset);
3554 }
3555
3556
3557 // Handle the contended cases.
3558 //
3559 // Each contended field should not intersect the cache line with another contended field.
3560 // In the absence of alignment information, we end up with pessimistically separating
3561 // the fields with full-width padding.
3562 //
3563 // Additionally, this should not break alignment for the fields, so we round the alignment up
3564 // for each field.
3565 if (nonstatic_contended_count > 0) {
3566
3567 // if there is at least one contended field, we need to have pre-padding for them
3568 next_nonstatic_padded_offset += ContendedPaddingWidth;
3569
3570 // collect all contended groups
3571 BitMap bm(_cp->size());
3572 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3573 // skip already laid out fields
3574 if (fs.is_offset_set()) continue;
3575
3576 if (fs.is_contended()) {
3577 bm.set_bit(fs.contended_group());
3578 }
3579 }
3580
3581 int current_group = -1;
3582 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3583
3584 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3585
3586 // skip already laid out fields
3587 if (fs.is_offset_set()) continue;
3588
3589 // skip non-contended fields and fields from different group
3590 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3591
3592 // handle statics below
3593 if (fs.access_flags().is_static()) continue;
3594
3595 int real_offset = 0;
3596 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3597
3598 switch (atype) {
3599 case NONSTATIC_BYTE:
3600 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3601 real_offset = next_nonstatic_padded_offset;
3602 next_nonstatic_padded_offset += 1;
3603 break;
3604
3605 case NONSTATIC_SHORT:
3606 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3607 real_offset = next_nonstatic_padded_offset;
3608 next_nonstatic_padded_offset += BytesPerShort;
3609 break;
3610
3611 case NONSTATIC_WORD:
3612 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3613 real_offset = next_nonstatic_padded_offset;
3614 next_nonstatic_padded_offset += BytesPerInt;
3615 break;
3616
3617 case NONSTATIC_DOUBLE:
3618 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3619 real_offset = next_nonstatic_padded_offset;
3620 next_nonstatic_padded_offset += BytesPerLong;
3621 break;
3622
3623 case NONSTATIC_OOP:
3624 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3625 real_offset = next_nonstatic_padded_offset;
3626 next_nonstatic_padded_offset += heapOopSize;
3627
3628 // Record this oop in the oop maps
3629 if( nonstatic_oop_map_count > 0 &&
3630 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3631 real_offset -
3632 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3633 heapOopSize ) {
3634 // This oop is adjacent to the previous one, add to current oop map
3635 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3636 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3637 } else {
3638 // This oop is not adjacent to the previous one, create new oop map
3639 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3640 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3641 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3642 nonstatic_oop_map_count += 1;
3643 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3644 first_nonstatic_oop_offset = real_offset;
3645 }
3646 }
3647 break;
3648
3649 default:
3650 ShouldNotReachHere();
3651 }
3652
3653 if (fs.contended_group() == 0) {
3654 // Contended group defines the equivalence class over the fields:
3655 // the fields within the same contended group are not inter-padded.
3656 // The only exception is default group, which does not incur the
3657 // equivalence, and so requires intra-padding.
3658 next_nonstatic_padded_offset += ContendedPaddingWidth;
3659 }
3660
3661 fs.set_offset(real_offset);
3662 } // for
3663
3664 // Start laying out the next group.
3665 // Note that this will effectively pad the last group in the back;
3666 // this is expected to alleviate memory contention effects for
3667 // subclass fields and/or adjacent object.
3668 // If this was the default group, the padding is already in place.
3669 if (current_group != 0) {
3670 next_nonstatic_padded_offset += ContendedPaddingWidth;
3671 }
3672 }
3673
3674 // handle static fields
3675 }
3676
3677 // Entire class is contended, pad in the back.
3678 // This helps to alleviate memory contention effects for subclass fields
3679 // and/or adjacent object.
3680 if (is_contended_class) {
3681 next_nonstatic_padded_offset += ContendedPaddingWidth;
3682 }
3683
3684 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3685
3686 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3687 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3688 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3689
3690 int static_field_size = (static_fields_end -
3691 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3692 nonstatic_field_size = nonstatic_field_size +
3693 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3694
3695 int instance_size = align_object_size(instance_end / wordSize);
3696
3697 assert(instance_size == align_object_size(align_size_up(
3698 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3699 wordSize) / wordSize), "consistent layout helper value");
3700
3701 // Invariant: nonstatic_field end/start should only change if there are
3702 // nonstatic fields in the class, or if the class is contended. We compare
3703 // against the non-aligned value, so that end alignment will not fail the
3704 // assert without actually having the fields.
3705 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3706 is_contended_class ||
3707 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3708
3709 // Number of non-static oop map blocks allocated at end of klass.
3710 const unsigned int total_oop_map_count =
3711 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3712 first_nonstatic_oop_offset);
3713
3714 #ifndef PRODUCT
3715 if (PrintFieldLayout) {
3716 print_field_layout(_class_name,
3717 _fields,
3718 _cp,
3719 instance_size,
3720 nonstatic_fields_start,
3721 nonstatic_fields_end,
3722 static_fields_end);
3723 }
3724
3725 #endif
3726 // Pass back information needed for InstanceKlass creation
3727 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3728 info->nonstatic_oop_counts = nonstatic_oop_counts;
3729 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3730 info->total_oop_map_count = total_oop_map_count;
3731 info->instance_size = instance_size;
3732 info->static_field_size = static_field_size;
3733 info->nonstatic_field_size = nonstatic_field_size;
3734 info->has_nonstatic_fields = has_nonstatic_fields;
3735 }
3736
3737
3738 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3739 ClassLoaderData* loader_data,
3740 Handle protection_domain,
3741 KlassHandle host_klass,
3742 GrowableArray<Handle>* cp_patches,
3743 TempNewSymbol& parsed_name,
3744 bool verify,
3745 TRAPS) {
3746
3747 // When a retransformable agent is attached, JVMTI caches the
3748 // class bytes that existed before the first retransformation.
3749 // If RedefineClasses() was used before the retransformable
3750 // agent attached, then the cached class bytes may not be the
3751 // original class bytes.
3752 JvmtiCachedClassFileData *cached_class_file = NULL;
3753 Handle class_loader(THREAD, loader_data->class_loader());
3754 bool has_default_methods = false;
3755 bool declares_default_methods = false;
3756 ResourceMark rm(THREAD);
3757
3758 ClassFileStream* cfs = stream();
3759 // Timing
3760 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3761 JavaThread* jt = (JavaThread*) THREAD;
3762
3763 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3764 ClassLoader::perf_class_parse_selftime(),
3765 NULL,
3766 jt->get_thread_stat()->perf_recursion_counts_addr(),
3767 jt->get_thread_stat()->perf_timers_addr(),
3768 PerfClassTraceTime::PARSE_CLASS);
3769
3770 init_parsed_class_attributes(loader_data);
3771
3772 if (JvmtiExport::should_post_class_file_load_hook()) {
3773 // Get the cached class file bytes (if any) from the class that
3774 // is being redefined or retransformed. We use jvmti_thread_state()
3775 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3776 // a JvmtiThreadState any earlier than necessary. This will help
3777 // avoid the bug described by 7126851.
3778 JvmtiThreadState *state = jt->jvmti_thread_state();
3779 if (state != NULL) {
3780 KlassHandle *h_class_being_redefined =
3781 state->get_class_being_redefined();
3782 if (h_class_being_redefined != NULL) {
3783 instanceKlassHandle ikh_class_being_redefined =
3784 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3785 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3786 }
3787 }
3788
3789 unsigned char* ptr = cfs->buffer();
3790 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3791
3792 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3793 &ptr, &end_ptr, &cached_class_file);
3794
3795 if (ptr != cfs->buffer()) {
3796 // JVMTI agent has modified class file data.
3797 // Set new class file stream using JVMTI agent modified
3798 // class file data.
3799 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3800 set_stream(cfs);
3801 }
3802 }
3803
3804 _host_klass = host_klass;
3805 _cp_patches = cp_patches;
3806
3807 instanceKlassHandle nullHandle;
3808
3809 // Figure out whether we can skip format checking (matching classic VM behavior)
3810 if (DumpSharedSpaces) {
3811 // verify == true means it's a 'remote' class (i.e., non-boot class)
3812 // Verification decision is based on BytecodeVerificationRemote flag
3813 // for those classes.
3814 _need_verify = (verify) ? BytecodeVerificationRemote :
3815 BytecodeVerificationLocal;
3816 } else {
3817 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3818 }
3819
3820 // Set the verify flag in stream
3821 cfs->set_verify(_need_verify);
3822
3823 // Save the class file name for easier error message printing.
3824 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3825
3826 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3827 // Magic value
3828 u4 magic = cfs->get_u4_fast();
3829 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3830 "Incompatible magic value %u in class file %s",
3831 magic, CHECK_(nullHandle));
3832
3833 // Version numbers
3834 u2 minor_version = cfs->get_u2_fast();
3835 u2 major_version = cfs->get_u2_fast();
3836
3837 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3838 ResourceMark rm;
3839 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3840 major_version, minor_version, name->as_C_string());
3841 Exceptions::fthrow(
3842 THREAD_AND_LOCATION,
3843 vmSymbols::java_lang_UnsupportedClassVersionError(),
3844 "Unsupported major.minor version for dump time %u.%u",
3845 major_version,
3846 minor_version);
3847 }
3848
3849 // Check version numbers - we check this even with verifier off
3850 if (!is_supported_version(major_version, minor_version)) {
3851 if (name == NULL) {
3852 Exceptions::fthrow(
3853 THREAD_AND_LOCATION,
3854 vmSymbols::java_lang_UnsupportedClassVersionError(),
3855 "Unsupported class file version %u.%u, "
3856 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3857 major_version,
3858 minor_version,
3859 JAVA_MAX_SUPPORTED_VERSION,
3860 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3861 } else {
3862 ResourceMark rm(THREAD);
3863 Exceptions::fthrow(
3864 THREAD_AND_LOCATION,
3865 vmSymbols::java_lang_UnsupportedClassVersionError(),
3866 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3867 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3868 name->as_C_string(),
3869 major_version,
3870 minor_version,
3871 JAVA_MAX_SUPPORTED_VERSION,
3872 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3873 }
3874 return nullHandle;
3875 }
3876
3877 _major_version = major_version;
3878 _minor_version = minor_version;
3879
3880
3881 // Check if verification needs to be relaxed for this class file
3882 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3883 _relax_verify = Verifier::relax_verify_for(class_loader());
3884
3885 // Constant pool
3886 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3887
3888 int cp_size = cp->length();
3889
3890 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3891
3892 // Access flags
3893 AccessFlags access_flags;
3894 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3895
3896 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3897 // Set abstract bit for old class files for backward compatibility
3898 flags |= JVM_ACC_ABSTRACT;
3899 }
3900 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3901 access_flags.set_flags(flags);
3902
3903 // This class and superclass
3904 u2 this_class_index = cfs->get_u2_fast();
3905 check_property(
3906 valid_cp_range(this_class_index, cp_size) &&
3907 cp->tag_at(this_class_index).is_unresolved_klass(),
3908 "Invalid this class index %u in constant pool in class file %s",
3909 this_class_index, CHECK_(nullHandle));
3910
3911 Symbol* class_name = cp->klass_name_at(this_class_index);
3912 assert(class_name != NULL, "class_name can't be null");
3913
3914 // It's important to set parsed_name *before* resolving the super class.
3915 // (it's used for cleanup by the caller if parsing fails)
3916 parsed_name = class_name;
3917 // parsed_name is returned and can be used if there's an error, so add to
3918 // its reference count. Caller will decrement the refcount.
3919 parsed_name->increment_refcount();
3920
3921 // Update _class_name which could be null previously to be class_name
3922 _class_name = class_name;
3923
3924 // Don't need to check whether this class name is legal or not.
3925 // It has been checked when constant pool is parsed.
3926 // However, make sure it is not an array type.
3927 if (_need_verify) {
3928 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3929 "Bad class name in class file %s",
3930 CHECK_(nullHandle));
3931 }
3932
3933 Klass* preserve_this_klass; // for storing result across HandleMark
3934
3935 // release all handles when parsing is done
3936 { HandleMark hm(THREAD);
3937
3938 // Checks if name in class file matches requested name
3939 if (name != NULL && class_name != name) {
3940 ResourceMark rm(THREAD);
3941 Exceptions::fthrow(
3942 THREAD_AND_LOCATION,
3943 vmSymbols::java_lang_NoClassDefFoundError(),
3944 "%s (wrong name: %s)",
3945 name->as_C_string(),
3946 class_name->as_C_string()
3947 );
3948 return nullHandle;
3949 }
3950
3951 if (TraceClassLoadingPreorder) {
3952 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3953 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3954 tty->print_cr("]");
3955 }
3956 #if INCLUDE_CDS
3957 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3958 // Only dump the classes that can be stored into CDS archive
3959 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3960 if (name != NULL) {
3961 ResourceMark rm(THREAD);
3962 classlist_file->print_cr("%s", name->as_C_string());
3963 classlist_file->flush();
3964 }
3965 }
3966 }
3967 #endif
3968
3969 u2 super_class_index = cfs->get_u2_fast();
3970 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3971 CHECK_NULL);
3972
3973 // Interfaces
3974 u2 itfs_len = cfs->get_u2_fast();
3975 Array<Klass*>* local_interfaces =
3976 parse_interfaces(itfs_len, protection_domain, _class_name,
3977 &has_default_methods, CHECK_(nullHandle));
3978
3979 u2 java_fields_count = 0;
3980 // Fields (offsets are filled in later)
3981 FieldAllocationCount fac;
3982 Array<u2>* fields = parse_fields(class_name,
3983 access_flags.is_interface(),
3984 &fac, &java_fields_count,
3985 CHECK_(nullHandle));
3986 // Methods
3987 bool has_final_method = false;
3988 AccessFlags promoted_flags;
3989 promoted_flags.set_flags(0);
3990 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3991 &promoted_flags,
3992 &has_final_method,
3993 &declares_default_methods,
3994 CHECK_(nullHandle));
3995
3996 if (declares_default_methods) {
3997 has_default_methods = true;
3998 }
3999
4000 // Additional attributes
4001 ClassAnnotationCollector parsed_annotations;
4002 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
4003
4004 // Finalize the Annotations metadata object,
4005 // now that all annotation arrays have been created.
4006 create_combined_annotations(CHECK_(nullHandle));
4007
4008 // Make sure this is the end of class file stream
4009 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
4010
4011 // We check super class after class file is parsed and format is checked
4012 if (super_class_index > 0 && super_klass.is_null()) {
4013 Symbol* sk = cp->klass_name_at(super_class_index);
4014 if (access_flags.is_interface()) {
4015 // Before attempting to resolve the superclass, check for class format
4016 // errors not checked yet.
4017 guarantee_property(sk == vmSymbols::java_lang_Object(),
4018 "Interfaces must have java.lang.Object as superclass in class file %s",
4019 CHECK_(nullHandle));
4020 }
4021 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4022 class_loader,
4023 protection_domain,
4024 true,
4025 CHECK_(nullHandle));
4026
4027 KlassHandle kh (THREAD, k);
4028 super_klass = instanceKlassHandle(THREAD, kh());
4029 }
4030 if (super_klass.not_null()) {
4031
4032 if (super_klass->has_default_methods()) {
4033 has_default_methods = true;
4034 }
4035
4036 if (super_klass->is_interface()) {
4037 ResourceMark rm(THREAD);
4038 Exceptions::fthrow(
4039 THREAD_AND_LOCATION,
4040 vmSymbols::java_lang_IncompatibleClassChangeError(),
4041 "class %s has interface %s as super class",
4042 class_name->as_klass_external_name(),
4043 super_klass->external_name()
4044 );
4045 return nullHandle;
4046 }
4047 // Make sure super class is not final
4048 if (super_klass->is_final()) {
4049 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4050 }
4051 }
4052
4053 // save super klass for error handling.
4054 _super_klass = super_klass;
4055
4056 // Compute the transitive list of all unique interfaces implemented by this class
4057 _transitive_interfaces =
4058 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4059
4060 // sort methods
4061 intArray* method_ordering = sort_methods(methods);
4062
4063 // promote flags from parse_methods() to the klass' flags
4064 access_flags.add_promoted_flags(promoted_flags.as_int());
4065
4066 // Size of Java vtable (in words)
4067 int vtable_size = 0;
4068 int itable_size = 0;
4069 int num_miranda_methods = 0;
4070
4071 GrowableArray<Method*> all_mirandas(20);
4072
4073 klassVtable::compute_vtable_size_and_num_mirandas(
4074 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4075 access_flags, class_loader, class_name, local_interfaces,
4076 CHECK_(nullHandle));
4077
4078 // Size of Java itable (in words)
4079 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4080
4081 FieldLayoutInfo info;
4082 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4083
4084 int total_oop_map_size2 =
4085 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4086
4087 // Compute reference type
4088 ReferenceType rt;
4089 if (super_klass() == NULL) {
4090 rt = REF_NONE;
4091 } else {
4092 rt = super_klass->reference_type();
4093 }
4094
4095 // We can now create the basic Klass* for this klass
4096 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4097 vtable_size,
4098 itable_size,
4099 info.static_field_size,
4100 total_oop_map_size2,
4101 rt,
4102 access_flags,
4103 name,
4104 super_klass(),
4105 !host_klass.is_null(),
4106 CHECK_(nullHandle));
4107 instanceKlassHandle this_klass (THREAD, _klass);
4108
4109 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4110 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4111 "sanity");
4112
4113 // Fill in information already parsed
4114 this_klass->set_should_verify_class(verify);
4115 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4116 this_klass->set_layout_helper(lh);
4117 assert(this_klass->is_instance_klass(), "layout is correct");
4118 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4119 // Not yet: supers are done below to support the new subtype-checking fields
4120 //this_klass->set_super(super_klass());
4121 this_klass->set_class_loader_data(loader_data);
4122 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4123 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4124 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4125
4126 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4127
4128 if (has_final_method) {
4129 this_klass->set_has_final_method();
4130 }
4131 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4132 // The InstanceKlass::_methods_jmethod_ids cache
4133 // is managed on the assumption that the initial cache
4134 // size is equal to the number of methods in the class. If
4135 // that changes, then InstanceKlass::idnum_can_increment()
4136 // has to be changed accordingly.
4137 this_klass->set_initial_method_idnum(methods->length());
4138 this_klass->set_name(cp->klass_name_at(this_class_index));
4139 if (is_anonymous()) // I am well known to myself
4140 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4141
4142 this_klass->set_minor_version(minor_version);
4143 this_klass->set_major_version(major_version);
4144 this_klass->set_has_default_methods(has_default_methods);
4145 this_klass->set_declares_default_methods(declares_default_methods);
4146
4147 if (!host_klass.is_null()) {
4148 assert (this_klass->is_anonymous(), "should be the same");
4149 this_klass->set_host_klass(host_klass());
4150 }
4151
4152 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4153 // (We used to do this lazily, but now we query it in Rewriter,
4154 // which is eagerly done for every method, so we might as well do it now,
4155 // when everything is fresh in memory.)
4156 vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass());
4157 if (klass_id != vmSymbols::NO_SID) {
4158 for (int j = 0; j < methods->length(); j++) {
4159 Method* method = methods->at(j);
4160 method->init_intrinsic_id();
4161
4162 if (CheckIntrinsics) {
4163 // Check if an intrinsic is defined for method 'method',
4164 // but the method is not annotated with @HotSpotIntrinsicCandidate.
4165 if (method->intrinsic_id() != vmIntrinsics::_none &&
4166 !method->intrinsic_candidate()) {
4167 tty->print("Compiler intrinsic is defined for method [%s], "
4168 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
4169 method->name_and_sig_as_C_string(),
4170 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4171 );
4172 tty->cr();
4173 DEBUG_ONLY(vm_exit(1));
4174 }
4175 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
4176 // but there is no intrinsic available for it.
4177 if (method->intrinsic_candidate() &&
4178 method->intrinsic_id() == vmIntrinsics::_none) {
4179 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
4180 "but no compiler intrinsic is defined for the method.%s",
4181 method->name_and_sig_as_C_string(),
4182 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4183 );
4184 tty->cr();
4185 DEBUG_ONLY(vm_exit(1));
4186 }
4187 }
4188 }
4189
4190 #ifdef ASSERT
4191 if (CheckIntrinsics) {
4192 // Check for orphan methods in the current class. A method m
4193 // of a class C is orphan if an intrinsic is defined for method m,
4194 // but class C does not declare m.
4195 // The check is potentially expensive, therefore it is available
4196 // only in debug builds.
4197
4198 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) {
4199 if (id == vmIntrinsics::_compiledLambdaForm) {
4200 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4201 // generated for the JVM from a LambdaForm and therefore no method
4202 // is defined for it.
4203 continue;
4204 }
4205
4206 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
4207 // Check if the current class contains a method with the same
4208 // name, flags, signature.
4209 bool match = false;
4210 for (int j = 0; j < methods->length(); j++) {
4211 Method* method = methods->at(j);
4212 if (id == method->intrinsic_id()) {
4213 match = true;
4214 break;
4215 }
4216 }
4217
4218 if (!match) {
4219 char buf[1000];
4220 tty->print("Compiler intrinsic is defined for method [%s], "
4221 "but the method is not available in class [%s].%s",
4222 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)),
4223 this_klass->name()->as_C_string(),
4224 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4225 );
4226 tty->cr();
4227 DEBUG_ONLY(vm_exit(1));
4228 }
4229 }
4230 }
4231 }
4232 #endif // ASSERT
4233 }
4234
4235
4236 if (cached_class_file != NULL) {
4237 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4238 this_klass->set_cached_class_file(cached_class_file);
4239 }
4240
4241 // Fill in field values obtained by parse_classfile_attributes
4242 if (parsed_annotations.has_any_annotations())
4243 parsed_annotations.apply_to(this_klass);
4244 apply_parsed_class_attributes(this_klass);
4245
4246 // Miranda methods
4247 if ((num_miranda_methods > 0) ||
4248 // if this class introduced new miranda methods or
4249 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4250 // super class exists and this class inherited miranda methods
4251 ) {
4252 this_klass->set_has_miranda_methods(); // then set a flag
4253 }
4254
4255 // Fill in information needed to compute superclasses.
4256 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4257
4258 // Initialize itable offset tables
4259 klassItable::setup_itable_offset_table(this_klass);
4260
4261 // Compute transitive closure of interfaces this class implements
4262 // Do final class setup
4263 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4264
4265 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4266 set_precomputed_flags(this_klass);
4267
4268 // reinitialize modifiers, using the InnerClasses attribute
4269 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4270 this_klass->set_modifier_flags(computed_modifiers);
4271
4272 // check if this class can access its super class
4273 check_super_class_access(this_klass, CHECK_(nullHandle));
4274
4275 // check if this class can access its superinterfaces
4276 check_super_interface_access(this_klass, CHECK_(nullHandle));
4277
4278 // check if this class overrides any final method
4279 check_final_method_override(this_klass, CHECK_(nullHandle));
4280
4281 // check that if this class is an interface then it doesn't have static methods
4282 if (this_klass->is_interface()) {
4283 /* An interface in a JAVA 8 classfile can be static */
4284 if (_major_version < JAVA_8_VERSION) {
4285 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4286 }
4287 }
4288
4289 // Allocate mirror and initialize static fields
4290 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4291 CHECK_(nullHandle));
4292
4293 // Generate any default methods - default methods are interface methods
4294 // that have a default implementation. This is new with Lambda project.
4295 if (has_default_methods ) {
4296 DefaultMethods::generate_default_methods(
4297 this_klass(), &all_mirandas, CHECK_(nullHandle));
4298 }
4299
4300 // Update the loader_data graph.
4301 record_defined_class_dependencies(this_klass, CHECK_NULL);
4302
4303 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4304 false /* not shared class */);
4305
4306 if (TraceClassLoading) {
4307 ResourceMark rm;
4308 // print in a single call to reduce interleaving of output
4309 if (cfs->source() != NULL) {
4310 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4311 cfs->source());
4312 } else if (class_loader.is_null()) {
4313 Klass* caller =
4314 THREAD->is_Java_thread()
4315 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4316 : NULL;
4317 // caller can be NULL, for example, during a JVMTI VM_Init hook
4318 if (caller != NULL) {
4319 tty->print("[Loaded %s by instance of %s]\n",
4320 this_klass->external_name(),
4321 caller->external_name());
4322 } else {
4323 tty->print("[Loaded %s]\n", this_klass->external_name());
4324 }
4325 } else {
4326 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4327 class_loader->klass()->external_name());
4328 }
4329 }
4330
4331 if (log_is_enabled(Debug, classload)) {
4332 this_klass()->print_loading_log(LogLevel::Debug, loader_data, cfs);
4333 }
4334 if (log_is_enabled(Trace, classload)) {
4335 this_klass()->print_loading_log(LogLevel::Trace, loader_data, cfs);
4336 }
4337
4338 if (TraceClassResolution) {
4339 ResourceMark rm;
4340 // print out the superclass.
4341 const char * from = this_klass()->external_name();
4342 if (this_klass->java_super() != NULL) {
4343 tty->print("RESOLVE %s %s (super)\n", from, this_klass->java_super()->external_name());
4344 }
4345 // print out each of the interface classes referred to by this class.
4346 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4347 if (local_interfaces != NULL) {
4348 int length = local_interfaces->length();
4349 for (int i = 0; i < length; i++) {
4350 Klass* k = local_interfaces->at(i);
4351 const char * to = k->external_name();
4352 tty->print("RESOLVE %s %s (interface)\n", from, to);
4353 }
4354 }
4355 }
4356
4357 // preserve result across HandleMark
4358 preserve_this_klass = this_klass();
4359 }
4360
4361 // Create new handle outside HandleMark (might be needed for
4362 // Extended Class Redefinition)
4363 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4364 debug_only(this_klass->verify();)
4365
4366 // Clear class if no error has occurred so destructor doesn't deallocate it
4367 _klass = NULL;
4368 return this_klass;
4369 }
4370
4371 // Destructor to clean up if there's an error
4372 ClassFileParser::~ClassFileParser() {
4373 MetadataFactory::free_metadata(_loader_data, _cp);
4374 MetadataFactory::free_array<u2>(_loader_data, _fields);
4375
4376 // Free methods
4377 InstanceKlass::deallocate_methods(_loader_data, _methods);
4378
4379 // beware of the Universe::empty_blah_array!!
4380 if (_inner_classes != Universe::the_empty_short_array()) {
4381 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4382 }
4383
4384 // Free interfaces
4385 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4386 _local_interfaces, _transitive_interfaces);
4387
4388 if (_combined_annotations != NULL) {
4389 // After all annotations arrays have been created, they are installed into the
4390 // Annotations object that will be assigned to the InstanceKlass being created.
4391
4392 // Deallocate the Annotations object and the installed annotations arrays.
4393 _combined_annotations->deallocate_contents(_loader_data);
4394
4395 // If the _combined_annotations pointer is non-NULL,
4396 // then the other annotations fields should have been cleared.
4397 assert(_annotations == NULL, "Should have been cleared");
4398 assert(_type_annotations == NULL, "Should have been cleared");
4399 assert(_fields_annotations == NULL, "Should have been cleared");
4400 assert(_fields_type_annotations == NULL, "Should have been cleared");
4401 } else {
4402 // If the annotations arrays were not installed into the Annotations object,
4403 // then they have to be deallocated explicitly.
4404 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4405 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4406 Annotations::free_contents(_loader_data, _fields_annotations);
4407 Annotations::free_contents(_loader_data, _fields_type_annotations);
4408 }
4409
4410 clear_class_metadata();
4411
4412 // deallocate the klass if already created. Don't directly deallocate, but add
4413 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4414 // at a safepoint.
4415 if (_klass != NULL) {
4416 _loader_data->add_to_deallocate_list(_klass);
4417 }
4418 _klass = NULL;
4419 }
4420
4421 void ClassFileParser::print_field_layout(Symbol* name,
4422 Array<u2>* fields,
4423 const constantPoolHandle& cp,
4424 int instance_size,
4425 int instance_fields_start,
4426 int instance_fields_end,
4427 int static_fields_end) {
4428 tty->print("%s: field layout\n", name->as_klass_external_name());
4429 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4430 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4431 if (!fs.access_flags().is_static()) {
4432 tty->print(" @%3d \"%s\" %s\n",
4433 fs.offset(),
4434 fs.name()->as_klass_external_name(),
4435 fs.signature()->as_klass_external_name());
4436 }
4437 }
4438 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4439 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4440 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4441 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4442 if (fs.access_flags().is_static()) {
4443 tty->print(" @%3d \"%s\" %s\n",
4444 fs.offset(),
4445 fs.name()->as_klass_external_name(),
4446 fs.signature()->as_klass_external_name());
4447 }
4448 }
4449 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4450 tty->print("\n");
4451 }
4452
4453 unsigned int
4454 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4455 unsigned int nonstatic_oop_map_count,
4456 int first_nonstatic_oop_offset) {
4457 unsigned int map_count =
4458 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4459 if (nonstatic_oop_map_count > 0) {
4460 // We have oops to add to map
4461 if (map_count == 0) {
4462 map_count = nonstatic_oop_map_count;
4463 } else {
4464 // Check whether we should add a new map block or whether the last one can
4465 // be extended
4466 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4467 OopMapBlock* const last_map = first_map + map_count - 1;
4468
4469 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4470 if (next_offset == first_nonstatic_oop_offset) {
4471 // There is no gap bettwen superklass's last oop field and first
4472 // local oop field, merge maps.
4473 nonstatic_oop_map_count -= 1;
4474 } else {
4475 // Superklass didn't end with a oop field, add extra maps
4476 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4477 }
4478 map_count += nonstatic_oop_map_count;
4479 }
4480 }
4481 return map_count;
4482 }
4483
4484
4485 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4486 unsigned int nonstatic_oop_map_count,
4487 int* nonstatic_oop_offsets,
4488 unsigned int* nonstatic_oop_counts) {
4489 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4490 const InstanceKlass* const super = k->superklass();
4491 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4492 if (super_count > 0) {
4493 // Copy maps from superklass
4494 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4495 for (unsigned int i = 0; i < super_count; ++i) {
4496 *this_oop_map++ = *super_oop_map++;
4497 }
4498 }
4499
4500 if (nonstatic_oop_map_count > 0) {
4501 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4502 // The counts differ because there is no gap between superklass's last oop
4503 // field and the first local oop field. Extend the last oop map copied
4504 // from the superklass instead of creating new one.
4505 nonstatic_oop_map_count--;
4506 nonstatic_oop_offsets++;
4507 this_oop_map--;
4508 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4509 this_oop_map++;
4510 }
4511
4512 // Add new map blocks, fill them
4513 while (nonstatic_oop_map_count-- > 0) {
4514 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4515 this_oop_map->set_count(*nonstatic_oop_counts++);
4516 this_oop_map++;
4517 }
4518 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4519 this_oop_map, "sanity");
4520 }
4521 }
4522
4523
4524 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4525 Klass* super = k->super();
4526
4527 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4528 // in which case we don't have to register objects as finalizable
4529 if (!_has_empty_finalizer) {
4530 if (_has_finalizer ||
4531 (super != NULL && super->has_finalizer())) {
4532 k->set_has_finalizer();
4533 }
4534 }
4535
4536 #ifdef ASSERT
4537 bool f = false;
4538 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4539 vmSymbols::void_method_signature());
4540 if (m != NULL && !m->is_empty_method()) {
4541 f = true;
4542 }
4543
4544 // Spec doesn't prevent agent from redefinition of empty finalizer.
4545 // Despite the fact that it's generally bad idea and redefined finalizer
4546 // will not work as expected we shouldn't abort vm in this case
4547 if (!k->has_redefined_this_or_super()) {
4548 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4549 }
4550 #endif
4551
4552 // Check if this klass supports the java.lang.Cloneable interface
4553 if (SystemDictionary::Cloneable_klass_loaded()) {
4554 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4555 k->set_is_cloneable();
4556 }
4557 }
4558
4559 // Check if this klass has a vanilla default constructor
4560 if (super == NULL) {
4561 // java.lang.Object has empty default constructor
4562 k->set_has_vanilla_constructor();
4563 } else {
4564 if (super->has_vanilla_constructor() &&
4565 _has_vanilla_constructor) {
4566 k->set_has_vanilla_constructor();
4567 }
4568 #ifdef ASSERT
4569 bool v = false;
4570 if (super->has_vanilla_constructor()) {
4571 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4572 ), vmSymbols::void_method_signature());
4573 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4574 v = true;
4575 }
4576 }
4577 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4578 #endif
4579 }
4580
4581 // If it cannot be fast-path allocated, set a bit in the layout helper.
4582 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4583 assert(k->size_helper() > 0, "layout_helper is initialized");
4584 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4585 || k->is_abstract() || k->is_interface()
4586 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4587 || k->size_helper() >= FastAllocateSizeLimit) {
4588 // Forbid fast-path allocation.
4589 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4590 k->set_layout_helper(lh);
4591 }
4592 }
4593
4594 // Attach super classes and interface classes to class loader data
4595 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4596 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4597 if (defining_loader_data->is_the_null_class_loader_data()) {
4598 // Dependencies to null class loader data are implicit.
4599 return;
4600 } else {
4601 // add super class dependency
4602 Klass* super = defined_klass->super();
4603 if (super != NULL) {
4604 defining_loader_data->record_dependency(super, CHECK);
4605 }
4606
4607 // add super interface dependencies
4608 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4609 if (local_interfaces != NULL) {
4610 int length = local_interfaces->length();
4611 for (int i = 0; i < length; i++) {
4612 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4613 }
4614 }
4615 }
4616 }
4617
4618 // utility methods for appending an array with check for duplicates
4619
4620 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4621 // iterate over new interfaces
4622 for (int i = 0; i < ifs->length(); i++) {
4623 Klass* e = ifs->at(i);
4624 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4625 // add new interface
4626 result->append_if_missing(e);
4627 }
4628 }
4629
4630 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4631 instanceKlassHandle super,
4632 Array<Klass*>* local_ifs, TRAPS) {
4633 // Compute maximum size for transitive interfaces
4634 int max_transitive_size = 0;
4635 int super_size = 0;
4636 // Add superclass transitive interfaces size
4637 if (super.not_null()) {
4638 super_size = super->transitive_interfaces()->length();
4639 max_transitive_size += super_size;
4640 }
4641 // Add local interfaces' super interfaces
4642 int local_size = local_ifs->length();
4643 for (int i = 0; i < local_size; i++) {
4644 Klass* l = local_ifs->at(i);
4645 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4646 }
4647 // Finally add local interfaces
4648 max_transitive_size += local_size;
4649 // Construct array
4650 if (max_transitive_size == 0) {
4651 // no interfaces, use canonicalized array
4652 return Universe::the_empty_klass_array();
4653 } else if (max_transitive_size == super_size) {
4654 // no new local interfaces added, share superklass' transitive interface array
4655 return super->transitive_interfaces();
4656 } else if (max_transitive_size == local_size) {
4657 // only local interfaces added, share local interface array
4658 return local_ifs;
4659 } else {
4660 ResourceMark rm;
4661 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4662
4663 // Copy down from superclass
4664 if (super.not_null()) {
4665 append_interfaces(result, super->transitive_interfaces());
4666 }
4667
4668 // Copy down from local interfaces' superinterfaces
4669 for (int i = 0; i < local_ifs->length(); i++) {
4670 Klass* l = local_ifs->at(i);
4671 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4672 }
4673 // Finally add local interfaces
4674 append_interfaces(result, local_ifs);
4675
4676 // length will be less than the max_transitive_size if duplicates were removed
4677 int length = result->length();
4678 assert(length <= max_transitive_size, "just checking");
4679 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4680 for (int i = 0; i < length; i++) {
4681 Klass* e = result->at(i);
4682 assert(e != NULL, "just checking");
4683 new_result->at_put(i, e);
4684 }
4685 return new_result;
4686 }
4687 }
4688
4689 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4690 Klass* super = this_klass->super();
4691 if ((super != NULL) &&
4692 (!Reflection::verify_class_access(this_klass(), super, false))) {
4693 ResourceMark rm(THREAD);
4694 Exceptions::fthrow(
4695 THREAD_AND_LOCATION,
4696 vmSymbols::java_lang_IllegalAccessError(),
4697 "class %s cannot access its superclass %s",
4698 this_klass->external_name(),
4699 super->external_name()
4700 );
4701 return;
4702 }
4703 }
4704
4705
4706 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4707 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4708 int lng = local_interfaces->length();
4709 for (int i = lng - 1; i >= 0; i--) {
4710 Klass* k = local_interfaces->at(i);
4711 assert (k != NULL && k->is_interface(), "invalid interface");
4712 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4713 ResourceMark rm(THREAD);
4714 Exceptions::fthrow(
4715 THREAD_AND_LOCATION,
4716 vmSymbols::java_lang_IllegalAccessError(),
4717 "class %s cannot access its superinterface %s",
4718 this_klass->external_name(),
4719 k->external_name()
4720 );
4721 return;
4722 }
4723 }
4724 }
4725
4726
4727 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4728 Array<Method*>* methods = this_klass->methods();
4729 int num_methods = methods->length();
4730
4731 // go thru each method and check if it overrides a final method
4732 for (int index = 0; index < num_methods; index++) {
4733 Method* m = methods->at(index);
4734
4735 // skip private, static, and <init> methods
4736 if ((!m->is_private() && !m->is_static()) &&
4737 (m->name() != vmSymbols::object_initializer_name())) {
4738
4739 Symbol* name = m->name();
4740 Symbol* signature = m->signature();
4741 Klass* k = this_klass->super();
4742 Method* super_m = NULL;
4743 while (k != NULL) {
4744 // skip supers that don't have final methods.
4745 if (k->has_final_method()) {
4746 // lookup a matching method in the super class hierarchy
4747 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4748 if (super_m == NULL) {
4749 break; // didn't find any match; get out
4750 }
4751
4752 if (super_m->is_final() && !super_m->is_static() &&
4753 // matching method in super is final, and not static
4754 (Reflection::verify_field_access(this_klass(),
4755 super_m->method_holder(),
4756 super_m->method_holder(),
4757 super_m->access_flags(), false))
4758 // this class can access super final method and therefore override
4759 ) {
4760 ResourceMark rm(THREAD);
4761 Exceptions::fthrow(
4762 THREAD_AND_LOCATION,
4763 vmSymbols::java_lang_VerifyError(),
4764 "class %s overrides final method %s.%s%s",
4765 this_klass->external_name(),
4766 super_m->method_holder()->external_name(),
4767 name->as_C_string(),
4768 signature->as_C_string()
4769 );
4770 return;
4771 }
4772
4773 // continue to look from super_m's holder's super.
4774 k = super_m->method_holder()->super();
4775 continue;
4776 }
4777
4778 k = k->super();
4779 }
4780 }
4781 }
4782 }
4783
4784
4785 // assumes that this_klass is an interface
4786 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4787 assert(this_klass->is_interface(), "not an interface");
4788 Array<Method*>* methods = this_klass->methods();
4789 int num_methods = methods->length();
4790
4791 for (int index = 0; index < num_methods; index++) {
4792 Method* m = methods->at(index);
4793 // if m is static and not the init method, throw a verify error
4794 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4795 ResourceMark rm(THREAD);
4796 Exceptions::fthrow(
4797 THREAD_AND_LOCATION,
4798 vmSymbols::java_lang_VerifyError(),
4799 "Illegal static method %s in interface %s",
4800 m->name()->as_C_string(),
4801 this_klass->external_name()
4802 );
4803 return;
4804 }
4805 }
4806 }
4807
4808 // utility methods for format checking
4809
4810 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4811 if (!_need_verify) { return; }
4812
4813 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4814 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4815 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4816 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4817 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4818 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4819 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4820
4821 if ((is_abstract && is_final) ||
4822 (is_interface && !is_abstract) ||
4823 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4824 (!is_interface && major_gte_15 && is_annotation)) {
4825 ResourceMark rm(THREAD);
4826 Exceptions::fthrow(
4827 THREAD_AND_LOCATION,
4828 vmSymbols::java_lang_ClassFormatError(),
4829 "Illegal class modifiers in class %s: 0x%X",
4830 _class_name->as_C_string(), flags
4831 );
4832 return;
4833 }
4834 }
4835
4836 bool ClassFileParser::has_illegal_visibility(jint flags) {
4837 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4838 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4839 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4840
4841 return ((is_public && is_protected) ||
4842 (is_public && is_private) ||
4843 (is_protected && is_private));
4844 }
4845
4846 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4847 u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4848 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4849 (major <= max_version) &&
4850 ((major != max_version) ||
4851 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4852 }
4853
4854 void ClassFileParser::verify_legal_field_modifiers(
4855 jint flags, bool is_interface, TRAPS) {
4856 if (!_need_verify) { return; }
4857
4858 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4859 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4860 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4861 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4862 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4863 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4864 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4865 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4866 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4867
4868 bool is_illegal = false;
4869
4870 if (is_interface) {
4871 if (!is_public || !is_static || !is_final || is_private ||
4872 is_protected || is_volatile || is_transient ||
4873 (major_gte_15 && is_enum)) {
4874 is_illegal = true;
4875 }
4876 } else { // not interface
4877 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4878 is_illegal = true;
4879 }
4880 }
4881
4882 if (is_illegal) {
4883 ResourceMark rm(THREAD);
4884 Exceptions::fthrow(
4885 THREAD_AND_LOCATION,
4886 vmSymbols::java_lang_ClassFormatError(),
4887 "Illegal field modifiers in class %s: 0x%X",
4888 _class_name->as_C_string(), flags);
4889 return;
4890 }
4891 }
4892
4893 void ClassFileParser::verify_legal_method_modifiers(
4894 jint flags, bool is_interface, Symbol* name, TRAPS) {
4895 if (!_need_verify) { return; }
4896
4897 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4898 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4899 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4900 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4901 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4902 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4903 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4904 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4905 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4906 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4907 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4908 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4909 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4910
4911 bool is_illegal = false;
4912
4913 if (is_interface) {
4914 if (major_gte_8) {
4915 // Class file version is JAVA_8_VERSION or later Methods of
4916 // interfaces may set any of the flags except ACC_PROTECTED,
4917 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4918 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4919 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4920 (is_native || is_protected || is_final || is_synchronized) ||
4921 // If a specific method of a class or interface has its
4922 // ACC_ABSTRACT flag set, it must not have any of its
4923 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4924 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4925 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4926 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4927 (is_abstract && (is_private || is_static || is_strict))) {
4928 is_illegal = true;
4929 }
4930 } else if (major_gte_15) {
4931 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4932 if (!is_public || is_static || is_final || is_synchronized ||
4933 is_native || !is_abstract || is_strict) {
4934 is_illegal = true;
4935 }
4936 } else {
4937 // Class file version is pre-JAVA_1_5_VERSION
4938 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4939 is_illegal = true;
4940 }
4941 }
4942 } else { // not interface
4943 if (has_illegal_visibility(flags)) {
4944 is_illegal = true;
4945 } else {
4946 if (is_initializer) {
4947 if (is_static || is_final || is_synchronized || is_native ||
4948 is_abstract || (major_gte_15 && is_bridge)) {
4949 is_illegal = true;
4950 }
4951 } else { // not initializer
4952 if (is_abstract) {
4953 if ((is_final || is_native || is_private || is_static ||
4954 (major_gte_15 && (is_synchronized || is_strict)))) {
4955 is_illegal = true;
4956 }
4957 }
4958 }
4959 }
4960 }
4961
4962 if (is_illegal) {
4963 ResourceMark rm(THREAD);
4964 Exceptions::fthrow(
4965 THREAD_AND_LOCATION,
4966 vmSymbols::java_lang_ClassFormatError(),
4967 "Method %s in class %s has illegal modifiers: 0x%X",
4968 name->as_C_string(), _class_name->as_C_string(), flags);
4969 return;
4970 }
4971 }
4972
4973 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4974 assert(_need_verify, "only called when _need_verify is true");
4975 int i = 0;
4976 int count = length >> 2;
4977 for (int k=0; k<count; k++) {
4978 unsigned char b0 = buffer[i];
4979 unsigned char b1 = buffer[i+1];
4980 unsigned char b2 = buffer[i+2];
4981 unsigned char b3 = buffer[i+3];
4982 // For an unsigned char v,
4983 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4984 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4985 unsigned char res = b0 | b0 - 1 |
4986 b1 | b1 - 1 |
4987 b2 | b2 - 1 |
4988 b3 | b3 - 1;
4989 if (res >= 128) break;
4990 i += 4;
4991 }
4992 for(; i < length; i++) {
4993 unsigned short c;
4994 // no embedded zeros
4995 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4996 if(buffer[i] < 128) {
4997 continue;
4998 }
4999 if ((i + 5) < length) { // see if it's legal supplementary character
5000 if (UTF8::is_supplementary_character(&buffer[i])) {
5001 c = UTF8::get_supplementary_character(&buffer[i]);
5002 i += 5;
5003 continue;
5004 }
5005 }
5006 switch (buffer[i] >> 4) {
5007 default: break;
5008 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
5009 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5010 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
5011 c = (buffer[i] & 0x1F) << 6;
5012 i++;
5013 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
5014 c += buffer[i] & 0x3F;
5015 if (_major_version <= 47 || c == 0 || c >= 0x80) {
5016 // for classes with major > 47, c must a null or a character in its shortest form
5017 break;
5018 }
5019 }
5020 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5021 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
5022 c = (buffer[i] & 0xF) << 12;
5023 i += 2;
5024 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
5025 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
5026 if (_major_version <= 47 || c >= 0x800) {
5027 // for classes with major > 47, c must be in its shortest form
5028 break;
5029 }
5030 }
5031 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5032 } // end of switch
5033 } // end of for
5034 }
5035
5036 // Checks if name is a legal class name.
5037 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
5038 if (!_need_verify || _relax_verify) { return; }
5039
5040 char buf[fixed_buffer_size];
5041 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5042 unsigned int length = name->utf8_length();
5043 bool legal = false;
5044
5045 if (length > 0) {
5046 char* p;
5047 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5048 p = skip_over_field_signature(bytes, false, length, CHECK);
5049 legal = (p != NULL) && ((p - bytes) == (int)length);
5050 } else if (_major_version < JAVA_1_5_VERSION) {
5051 if (bytes[0] != '<') {
5052 p = skip_over_field_name(bytes, true, length);
5053 legal = (p != NULL) && ((p - bytes) == (int)length);
5054 }
5055 } else {
5056 // 4900761: relax the constraints based on JSR202 spec
5057 // Class names may be drawn from the entire Unicode character set.
5058 // Identifiers between '/' must be unqualified names.
5059 // The utf8 string has been verified when parsing cpool entries.
5060 legal = verify_unqualified_name(bytes, length, LegalClass);
5061 }
5062 }
5063 if (!legal) {
5064 ResourceMark rm(THREAD);
5065 Exceptions::fthrow(
5066 THREAD_AND_LOCATION,
5067 vmSymbols::java_lang_ClassFormatError(),
5068 "Illegal class name \"%s\" in class file %s", bytes,
5069 _class_name->as_C_string()
5070 );
5071 return;
5072 }
5073 }
5074
5075 // Checks if name is a legal field name.
5076 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
5077 if (!_need_verify || _relax_verify) { return; }
5078
5079 char buf[fixed_buffer_size];
5080 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5081 unsigned int length = name->utf8_length();
5082 bool legal = false;
5083
5084 if (length > 0) {
5085 if (_major_version < JAVA_1_5_VERSION) {
5086 if (bytes[0] != '<') {
5087 char* p = skip_over_field_name(bytes, false, length);
5088 legal = (p != NULL) && ((p - bytes) == (int)length);
5089 }
5090 } else {
5091 // 4881221: relax the constraints based on JSR202 spec
5092 legal = verify_unqualified_name(bytes, length, LegalField);
5093 }
5094 }
5095
5096 if (!legal) {
5097 ResourceMark rm(THREAD);
5098 Exceptions::fthrow(
5099 THREAD_AND_LOCATION,
5100 vmSymbols::java_lang_ClassFormatError(),
5101 "Illegal field name \"%s\" in class %s", bytes,
5102 _class_name->as_C_string()
5103 );
5104 return;
5105 }
5106 }
5107
5108 // Checks if name is a legal method name.
5109 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5110 if (!_need_verify || _relax_verify) { return; }
5111
5112 assert(name != NULL, "method name is null");
5113 char buf[fixed_buffer_size];
5114 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5115 unsigned int length = name->utf8_length();
5116 bool legal = false;
5117
5118 if (length > 0) {
5119 if (bytes[0] == '<') {
5120 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5121 legal = true;
5122 }
5123 } else if (_major_version < JAVA_1_5_VERSION) {
5124 char* p;
5125 p = skip_over_field_name(bytes, false, length);
5126 legal = (p != NULL) && ((p - bytes) == (int)length);
5127 } else {
5128 // 4881221: relax the constraints based on JSR202 spec
5129 legal = verify_unqualified_name(bytes, length, LegalMethod);
5130 }
5131 }
5132
5133 if (!legal) {
5134 ResourceMark rm(THREAD);
5135 Exceptions::fthrow(
5136 THREAD_AND_LOCATION,
5137 vmSymbols::java_lang_ClassFormatError(),
5138 "Illegal method name \"%s\" in class %s", bytes,
5139 _class_name->as_C_string()
5140 );
5141 return;
5142 }
5143 }
5144
5145
5146 // Checks if signature is a legal field signature.
5147 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5148 if (!_need_verify) { return; }
5149
5150 char buf[fixed_buffer_size];
5151 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5152 unsigned int length = signature->utf8_length();
5153 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5154
5155 if (p == NULL || (p - bytes) != (int)length) {
5156 throwIllegalSignature("Field", name, signature, CHECK);
5157 }
5158 }
5159
5160 // Checks if signature is a legal method signature.
5161 // Returns number of parameters
5162 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5163 if (!_need_verify) {
5164 // make sure caller's args_size will be less than 0 even for non-static
5165 // method so it will be recomputed in compute_size_of_parameters().
5166 return -2;
5167 }
5168
5169 // Class initializers cannot have args for class format version >= 51.
5170 if (name == vmSymbols::class_initializer_name() &&
5171 signature != vmSymbols::void_method_signature() &&
5172 _major_version >= JAVA_7_VERSION) {
5173 throwIllegalSignature("Method", name, signature, CHECK_0);
5174 return 0;
5175 }
5176
5177 unsigned int args_size = 0;
5178 char buf[fixed_buffer_size];
5179 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5180 unsigned int length = signature->utf8_length();
5181 char* nextp;
5182
5183 // The first character must be a '('
5184 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5185 length--;
5186 // Skip over legal field signatures
5187 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5188 while ((length > 0) && (nextp != NULL)) {
5189 args_size++;
5190 if (p[0] == 'J' || p[0] == 'D') {
5191 args_size++;
5192 }
5193 length -= nextp - p;
5194 p = nextp;
5195 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5196 }
5197 // The first non-signature thing better be a ')'
5198 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5199 length--;
5200 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5201 // All internal methods must return void
5202 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5203 return args_size;
5204 }
5205 } else {
5206 // Now we better just have a return value
5207 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5208 if (nextp && ((int)length == (nextp - p))) {
5209 return args_size;
5210 }
5211 }
5212 }
5213 }
5214 // Report error
5215 throwIllegalSignature("Method", name, signature, CHECK_0);
5216 return 0;
5217 }
5218
5219
5220 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5221 // Method names also may not contain the characters '<' or '>', unless <init>
5222 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5223 // method. Because these names have been checked as special cases before
5224 // calling this method in verify_legal_method_name.
5225 bool ClassFileParser::verify_unqualified_name(
5226 char* name, unsigned int length, int type) {
5227 jchar ch;
5228
5229 for (char* p = name; p != name + length; ) {
5230 ch = *p;
5231 if (ch < 128) {
5232 p++;
5233 if (ch == '.' || ch == ';' || ch == '[' ) {
5234 return false; // do not permit '.', ';', or '['
5235 }
5236 if (type != LegalClass && ch == '/') {
5237 return false; // do not permit '/' unless it's class name
5238 }
5239 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5240 return false; // do not permit '<' or '>' in method names
5241 }
5242 } else {
5243 char* tmp_p = UTF8::next(p, &ch);
5244 p = tmp_p;
5245 }
5246 }
5247 return true;
5248 }
5249
5250
5251 // Take pointer to a string. Skip over the longest part of the string that could
5252 // be taken as a fieldname. Allow '/' if slash_ok is true.
5253 // Return a pointer to just past the fieldname.
5254 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5255 // being true, we saw consecutive slashes (meaning we were looking for a
5256 // qualified path but found something that was badly-formed).
5257 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5258 char* p;
5259 jchar ch;
5260 jboolean last_is_slash = false;
5261 jboolean not_first_ch = false;
5262
5263 for (p = name; p != name + length; not_first_ch = true) {
5264 char* old_p = p;
5265 ch = *p;
5266 if (ch < 128) {
5267 p++;
5268 // quick check for ascii
5269 if ((ch >= 'a' && ch <= 'z') ||
5270 (ch >= 'A' && ch <= 'Z') ||
5271 (ch == '_' || ch == '$') ||
5272 (not_first_ch && ch >= '0' && ch <= '9')) {
5273 last_is_slash = false;
5274 continue;
5275 }
5276 if (slash_ok && ch == '/') {
5277 if (last_is_slash) {
5278 return NULL; // Don't permit consecutive slashes
5279 }
5280 last_is_slash = true;
5281 continue;
5282 }
5283 } else {
5284 jint unicode_ch;
5285 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5286 p = tmp_p;
5287 last_is_slash = false;
5288 // Check if ch is Java identifier start or is Java identifier part
5289 // 4672820: call java.lang.Character methods directly without generating separate tables.
5290 EXCEPTION_MARK;
5291 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5292
5293 // return value
5294 JavaValue result(T_BOOLEAN);
5295 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5296 JavaCallArguments args;
5297 args.push_int(unicode_ch);
5298
5299 // public static boolean isJavaIdentifierStart(char ch);
5300 JavaCalls::call_static(&result,
5301 klass,
5302 vmSymbols::isJavaIdentifierStart_name(),
5303 vmSymbols::int_bool_signature(),
5304 &args,
5305 THREAD);
5306
5307 if (HAS_PENDING_EXCEPTION) {
5308 CLEAR_PENDING_EXCEPTION;
5309 return 0;
5310 }
5311 if (result.get_jboolean()) {
5312 continue;
5313 }
5314
5315 if (not_first_ch) {
5316 // public static boolean isJavaIdentifierPart(char ch);
5317 JavaCalls::call_static(&result,
5318 klass,
5319 vmSymbols::isJavaIdentifierPart_name(),
5320 vmSymbols::int_bool_signature(),
5321 &args,
5322 THREAD);
5323
5324 if (HAS_PENDING_EXCEPTION) {
5325 CLEAR_PENDING_EXCEPTION;
5326 return 0;
5327 }
5328
5329 if (result.get_jboolean()) {
5330 continue;
5331 }
5332 }
5333 }
5334 return (not_first_ch) ? old_p : NULL;
5335 }
5336 return (not_first_ch) ? p : NULL;
5337 }
5338
5339
5340 // Take pointer to a string. Skip over the longest part of the string that could
5341 // be taken as a field signature. Allow "void" if void_ok.
5342 // Return a pointer to just past the signature.
5343 // Return NULL if no legal signature is found.
5344 char* ClassFileParser::skip_over_field_signature(char* signature,
5345 bool void_ok,
5346 unsigned int length,
5347 TRAPS) {
5348 unsigned int array_dim = 0;
5349 while (length > 0) {
5350 switch (signature[0]) {
5351 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5352 case JVM_SIGNATURE_BOOLEAN:
5353 case JVM_SIGNATURE_BYTE:
5354 case JVM_SIGNATURE_CHAR:
5355 case JVM_SIGNATURE_SHORT:
5356 case JVM_SIGNATURE_INT:
5357 case JVM_SIGNATURE_FLOAT:
5358 case JVM_SIGNATURE_LONG:
5359 case JVM_SIGNATURE_DOUBLE:
5360 return signature + 1;
5361 case JVM_SIGNATURE_CLASS: {
5362 if (_major_version < JAVA_1_5_VERSION) {
5363 // Skip over the class name if one is there
5364 char* p = skip_over_field_name(signature + 1, true, --length);
5365
5366 // The next character better be a semicolon
5367 if (p && (p - signature) > 1 && p[0] == ';') {
5368 return p + 1;
5369 }
5370 } else {
5371 // 4900761: For class version > 48, any unicode is allowed in class name.
5372 length--;
5373 signature++;
5374 while (length > 0 && signature[0] != ';') {
5375 if (signature[0] == '.') {
5376 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5377 }
5378 length--;
5379 signature++;
5380 }
5381 if (signature[0] == ';') { return signature + 1; }
5382 }
5383
5384 return NULL;
5385 }
5386 case JVM_SIGNATURE_ARRAY:
5387 array_dim++;
5388 if (array_dim > 255) {
5389 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5390 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5391 }
5392 // The rest of what's there better be a legal signature
5393 signature++;
5394 length--;
5395 void_ok = false;
5396 break;
5397
5398 default:
5399 return NULL;
5400 }
5401 }
5402 return NULL;
5403 }