1 /*
2 * Copyright (c) 1997, 2023, 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 "oops/inlineKlass.hpp"
26 #include "precompiled.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/classLoadInfo.hpp"
33 #include "classfile/defaultMethods.hpp"
34 #include "classfile/fieldLayoutBuilder.hpp"
35 #include "classfile/javaClasses.inline.hpp"
36 #include "classfile/moduleEntry.hpp"
37 #include "classfile/packageEntry.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionary.hpp"
40 #include "classfile/verificationType.hpp"
41 #include "classfile/verifier.hpp"
42 #include "classfile/vmClasses.hpp"
43 #include "classfile/vmSymbols.hpp"
44 #include "jvm.h"
45 #include "logging/log.hpp"
46 #include "logging/logStream.hpp"
47 #include "memory/allocation.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/annotations.hpp"
53 #include "oops/constantPool.inline.hpp"
54 #include "oops/fieldInfo.hpp"
55 #include "oops/fieldStreams.inline.hpp"
56 #include "oops/inlineKlass.inline.hpp"
57 #include "oops/instanceKlass.inline.hpp"
58 #include "oops/instanceMirrorKlass.hpp"
59 #include "oops/klass.inline.hpp"
60 #include "oops/klassVtable.hpp"
61 #include "oops/metadata.hpp"
62 #include "oops/method.inline.hpp"
63 #include "oops/oop.inline.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/symbol.hpp"
66 #include "prims/jvmtiExport.hpp"
67 #include "prims/jvmtiThreadState.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/fieldDescriptor.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/os.hpp"
73 #include "runtime/perfData.hpp"
74 #include "runtime/reflection.hpp"
75 #include "runtime/safepointVerifiers.hpp"
76 #include "runtime/signature.hpp"
77 #include "runtime/timer.hpp"
78 #include "services/classLoadingService.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/bitMap.inline.hpp"
82 #include "utilities/checkedCast.hpp"
83 #include "utilities/copy.hpp"
84 #include "utilities/formatBuffer.hpp"
85 #include "utilities/exceptions.hpp"
86 #include "utilities/globalDefinitions.hpp"
87 #include "utilities/growableArray.hpp"
88 #include "utilities/macros.hpp"
89 #include "utilities/ostream.hpp"
90 #include "utilities/resourceHash.hpp"
91 #include "utilities/stringUtils.hpp"
92 #include "utilities/utf8.hpp"
93 #if INCLUDE_CDS
94 #include "classfile/systemDictionaryShared.hpp"
95 #endif
96 #if INCLUDE_JFR
97 #include "jfr/support/jfrTraceIdExtension.hpp"
98 #endif
99
100 // We generally try to create the oops directly when parsing, rather than
101 // allocating temporary data structures and copying the bytes twice. A
102 // temporary area is only needed when parsing utf8 entries in the constant
103 // pool and when parsing line number tables.
104
105 // We add assert in debug mode when class format is not checked.
106
107 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
108 #define JAVA_MIN_SUPPORTED_VERSION 45
109 #define JAVA_PREVIEW_MINOR_VERSION 65535
110
111 // Used for two backward compatibility reasons:
112 // - to check for new additions to the class file format in JDK1.5
113 // - to check for bug fixes in the format checker in JDK1.5
114 #define JAVA_1_5_VERSION 49
115
116 // Used for backward compatibility reasons:
117 // - to check for javac bug fixes that happened after 1.5
118 // - also used as the max version when running in jdk6
119 #define JAVA_6_VERSION 50
120
121 // Used for backward compatibility reasons:
122 // - to disallow argument and require ACC_STATIC for <clinit> methods
123 #define JAVA_7_VERSION 51
124
125 // Extension method support.
126 #define JAVA_8_VERSION 52
127
128 #define JAVA_9_VERSION 53
129
130 #define JAVA_10_VERSION 54
131
132 #define JAVA_11_VERSION 55
133
134 #define JAVA_12_VERSION 56
135
136 #define JAVA_13_VERSION 57
137
138 #define JAVA_14_VERSION 58
139
140 #define JAVA_15_VERSION 59
141
142 #define JAVA_16_VERSION 60
143
144 #define JAVA_17_VERSION 61
145
146 #define JAVA_18_VERSION 62
147
148 #define JAVA_19_VERSION 63
149
150 #define JAVA_20_VERSION 64
151
152 #define JAVA_21_VERSION 65
153
154 #define JAVA_22_VERSION 66
155
156 #define CONSTANT_CLASS_DESCRIPTORS 67
157
158 #define JAVA_23_VERSION 67
159
160 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
161 assert((bad_constant == JVM_CONSTANT_Module ||
162 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
163 "Unexpected bad constant pool entry");
164 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
165 }
166
167 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
168 ConstantPool* cp,
169 const int length,
170 TRAPS) {
171 assert(stream != nullptr, "invariant");
172 assert(cp != nullptr, "invariant");
173
174 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
175 // this function (_current can be allocated in a register, with scalar
176 // replacement of aggregates). The _current pointer is copied back to
177 // stream() when this function returns. DON'T call another method within
178 // this method that uses stream().
179 const ClassFileStream cfs1 = *stream;
180 const ClassFileStream* const cfs = &cfs1;
181
182 debug_only(const u1* const old_current = stream->current();)
183
184 // Used for batching symbol allocations.
185 const char* names[SymbolTable::symbol_alloc_batch_size];
186 int lengths[SymbolTable::symbol_alloc_batch_size];
187 int indices[SymbolTable::symbol_alloc_batch_size];
188 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
189 int names_count = 0;
190
191 // parsing Index 0 is unused
192 for (int index = 1; index < length; index++) {
193 // Each of the following case guarantees one more byte in the stream
194 // for the following tag or the access_flags following constant pool,
195 // so we don't need bounds-check for reading tag.
196 const u1 tag = cfs->get_u1_fast();
197 switch (tag) {
198 case JVM_CONSTANT_Class: {
199 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
200 const u2 name_index = cfs->get_u2_fast();
201 cp->klass_index_at_put(index, name_index);
202 break;
203 }
204 case JVM_CONSTANT_Fieldref: {
205 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
206 const u2 class_index = cfs->get_u2_fast();
207 const u2 name_and_type_index = cfs->get_u2_fast();
208 cp->field_at_put(index, class_index, name_and_type_index);
209 break;
210 }
211 case JVM_CONSTANT_Methodref: {
212 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
213 const u2 class_index = cfs->get_u2_fast();
214 const u2 name_and_type_index = cfs->get_u2_fast();
215 cp->method_at_put(index, class_index, name_and_type_index);
216 break;
217 }
218 case JVM_CONSTANT_InterfaceMethodref: {
219 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
220 const u2 class_index = cfs->get_u2_fast();
221 const u2 name_and_type_index = cfs->get_u2_fast();
222 cp->interface_method_at_put(index, class_index, name_and_type_index);
223 break;
224 }
225 case JVM_CONSTANT_String : {
226 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
227 const u2 string_index = cfs->get_u2_fast();
228 cp->string_index_at_put(index, string_index);
229 break;
230 }
231 case JVM_CONSTANT_MethodHandle :
232 case JVM_CONSTANT_MethodType: {
233 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
234 classfile_parse_error(
235 "Class file version does not support constant tag %u in class file %s",
236 tag, THREAD);
237 return;
238 }
239 if (tag == JVM_CONSTANT_MethodHandle) {
240 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
241 const u1 ref_kind = cfs->get_u1_fast();
242 const u2 method_index = cfs->get_u2_fast();
243 cp->method_handle_index_at_put(index, ref_kind, method_index);
244 }
245 else if (tag == JVM_CONSTANT_MethodType) {
246 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
247 const u2 signature_index = cfs->get_u2_fast();
248 cp->method_type_index_at_put(index, signature_index);
249 }
250 else {
251 ShouldNotReachHere();
252 }
253 break;
254 }
255 case JVM_CONSTANT_Dynamic : {
256 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
257 classfile_parse_error(
258 "Class file version does not support constant tag %u in class file %s",
259 tag, THREAD);
260 return;
261 }
262 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
263 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
264 const u2 name_and_type_index = cfs->get_u2_fast();
265 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
266 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
267 }
268 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
269 break;
270 }
271 case JVM_CONSTANT_InvokeDynamic : {
272 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
273 classfile_parse_error(
274 "Class file version does not support constant tag %u in class file %s",
275 tag, THREAD);
276 return;
277 }
278 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
279 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
280 const u2 name_and_type_index = cfs->get_u2_fast();
281 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
282 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
283 }
284 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
285 break;
286 }
287 case JVM_CONSTANT_Integer: {
288 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
289 const u4 bytes = cfs->get_u4_fast();
290 cp->int_at_put(index, (jint)bytes);
291 break;
292 }
293 case JVM_CONSTANT_Float: {
294 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
295 const u4 bytes = cfs->get_u4_fast();
296 cp->float_at_put(index, *(jfloat*)&bytes);
297 break;
298 }
299 case JVM_CONSTANT_Long: {
300 // A mangled type might cause you to overrun allocated memory
301 guarantee_property(index + 1 < length,
302 "Invalid constant pool entry %u in class file %s",
303 index,
304 CHECK);
305 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
306 const u8 bytes = cfs->get_u8_fast();
307 cp->long_at_put(index, bytes);
308 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
309 break;
310 }
311 case JVM_CONSTANT_Double: {
312 // A mangled type might cause you to overrun allocated memory
313 guarantee_property(index+1 < length,
314 "Invalid constant pool entry %u in class file %s",
315 index,
316 CHECK);
317 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
318 const u8 bytes = cfs->get_u8_fast();
319 cp->double_at_put(index, *(jdouble*)&bytes);
320 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
321 break;
322 }
323 case JVM_CONSTANT_NameAndType: {
324 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
325 const u2 name_index = cfs->get_u2_fast();
326 const u2 signature_index = cfs->get_u2_fast();
327 cp->name_and_type_at_put(index, name_index, signature_index);
328 break;
329 }
330 case JVM_CONSTANT_Utf8 : {
331 cfs->guarantee_more(2, CHECK); // utf8_length
332 u2 utf8_length = cfs->get_u2_fast();
333 const u1* utf8_buffer = cfs->current();
334 assert(utf8_buffer != nullptr, "null utf8 buffer");
335 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
336 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
337 cfs->skip_u1_fast(utf8_length);
338
339 // Before storing the symbol, make sure it's legal
340 if (_need_verify) {
341 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
342 }
343
344 unsigned int hash;
345 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
346 utf8_length,
347 hash);
348 if (result == nullptr) {
349 names[names_count] = (const char*)utf8_buffer;
350 lengths[names_count] = utf8_length;
351 indices[names_count] = index;
352 hashValues[names_count++] = hash;
353 if (names_count == SymbolTable::symbol_alloc_batch_size) {
354 SymbolTable::new_symbols(_loader_data,
355 constantPoolHandle(THREAD, cp),
356 names_count,
357 names,
358 lengths,
359 indices,
360 hashValues);
361 names_count = 0;
362 }
363 } else {
364 cp->symbol_at_put(index, result);
365 }
366 break;
367 }
368 case JVM_CONSTANT_Module:
369 case JVM_CONSTANT_Package: {
370 // Record that an error occurred in these two cases but keep parsing so
371 // that ACC_Module can be checked for in the access_flags. Need to
372 // throw NoClassDefFoundError in that case.
373 if (_major_version >= JAVA_9_VERSION) {
374 cfs->guarantee_more(3, CHECK);
375 cfs->get_u2_fast();
376 set_class_bad_constant_seen(tag);
377 break;
378 }
379 }
380 default: {
381 classfile_parse_error("Unknown constant tag %u in class file %s",
382 tag,
383 THREAD);
384 return;
385 }
386 } // end of switch(tag)
387 } // end of for
388
389 // Allocate the remaining symbols
390 if (names_count > 0) {
391 SymbolTable::new_symbols(_loader_data,
392 constantPoolHandle(THREAD, cp),
393 names_count,
394 names,
395 lengths,
396 indices,
397 hashValues);
398 }
399
400 // Copy _current pointer of local copy back to stream.
401 assert(stream->current() == old_current, "non-exclusive use of stream");
402 stream->set_current(cfs1.current());
403
404 }
405
406 static inline bool valid_cp_range(int index, int length) {
407 return (index > 0 && index < length);
408 }
409
410 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
411 assert(cp != nullptr, "invariant");
412 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
413 return cp->symbol_at(index);
414 }
415 return nullptr;
416 }
417
418 #ifdef ASSERT
419 PRAGMA_DIAG_PUSH
420 PRAGMA_FORMAT_NONLITERAL_IGNORED
421 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
422 ResourceMark rm(THREAD);
423 fatal(msg, _class_name->as_C_string());
424 }
425
426 void ClassFileParser::report_assert_property_failure(const char* msg,
427 int index,
428 TRAPS) const {
429 ResourceMark rm(THREAD);
430 fatal(msg, index, _class_name->as_C_string());
431 }
432 PRAGMA_DIAG_POP
433 #endif
434
435 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
436 ConstantPool* const cp,
437 const int length,
438 TRAPS) {
439 assert(cp != nullptr, "invariant");
440 assert(stream != nullptr, "invariant");
441
442 // parsing constant pool entries
443 parse_constant_pool_entries(stream, cp, length, CHECK);
444 if (class_bad_constant_seen() != 0) {
445 // a bad CP entry has been detected previously so stop parsing and just return.
446 return;
447 }
448
449 int index = 1; // declared outside of loops for portability
450 int num_klasses = 0;
451
452 // first verification pass - validate cross references
453 // and fixup class and string constants
454 for (index = 1; index < length; index++) { // Index 0 is unused
455 const jbyte tag = cp->tag_at(index).value();
456 switch (tag) {
457 case JVM_CONSTANT_Class: {
458 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
459 break;
460 }
461 case JVM_CONSTANT_Fieldref:
462 // fall through
463 case JVM_CONSTANT_Methodref:
464 // fall through
465 case JVM_CONSTANT_InterfaceMethodref: {
466 if (!_need_verify) break;
467 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
468 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
469 check_property(valid_klass_reference_at(klass_ref_index),
470 "Invalid constant pool index %u in class file %s",
471 klass_ref_index, CHECK);
472 check_property(valid_cp_range(name_and_type_ref_index, length) &&
473 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
474 "Invalid constant pool index %u in class file %s",
475 name_and_type_ref_index, CHECK);
476 break;
477 }
478 case JVM_CONSTANT_String: {
479 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
480 break;
481 }
482 case JVM_CONSTANT_Integer:
483 break;
484 case JVM_CONSTANT_Float:
485 break;
486 case JVM_CONSTANT_Long:
487 case JVM_CONSTANT_Double: {
488 index++;
489 check_property(
490 (index < length && cp->tag_at(index).is_invalid()),
491 "Improper constant pool long/double index %u in class file %s",
492 index, CHECK);
493 break;
494 }
495 case JVM_CONSTANT_NameAndType: {
496 if (!_need_verify) break;
497 const int name_ref_index = cp->name_ref_index_at(index);
498 const int signature_ref_index = cp->signature_ref_index_at(index);
499 check_property(valid_symbol_at(name_ref_index),
500 "Invalid constant pool index %u in class file %s",
501 name_ref_index, CHECK);
502 check_property(valid_symbol_at(signature_ref_index),
503 "Invalid constant pool index %u in class file %s",
504 signature_ref_index, CHECK);
505 break;
506 }
507 case JVM_CONSTANT_Utf8:
508 break;
509 case JVM_CONSTANT_UnresolvedClass: // fall-through
510 case JVM_CONSTANT_UnresolvedClassInError: {
511 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
512 break;
513 }
514 case JVM_CONSTANT_ClassIndex: {
515 const int class_index = cp->klass_index_at(index);
516 check_property(valid_symbol_at(class_index),
517 "Invalid constant pool index %u in class file %s",
518 class_index, CHECK);
519
520 Symbol* const name = cp->symbol_at(class_index);
521 const unsigned int name_len = name->utf8_length();
522 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
523 break;
524 }
525 case JVM_CONSTANT_StringIndex: {
526 const int string_index = cp->string_index_at(index);
527 check_property(valid_symbol_at(string_index),
528 "Invalid constant pool index %u in class file %s",
529 string_index, CHECK);
530 Symbol* const sym = cp->symbol_at(string_index);
531 cp->unresolved_string_at_put(index, sym);
532 break;
533 }
534 case JVM_CONSTANT_MethodHandle: {
535 const int ref_index = cp->method_handle_index_at(index);
536 check_property(valid_cp_range(ref_index, length),
537 "Invalid constant pool index %u in class file %s",
538 ref_index, CHECK);
539 const constantTag tag = cp->tag_at(ref_index);
540 const int ref_kind = cp->method_handle_ref_kind_at(index);
541
542 switch (ref_kind) {
543 case JVM_REF_getField:
544 case JVM_REF_getStatic:
545 case JVM_REF_putField:
546 case JVM_REF_putStatic: {
547 check_property(
548 tag.is_field(),
549 "Invalid constant pool index %u in class file %s (not a field)",
550 ref_index, CHECK);
551 break;
552 }
553 case JVM_REF_invokeVirtual:
554 case JVM_REF_newInvokeSpecial: {
555 check_property(
556 tag.is_method(),
557 "Invalid constant pool index %u in class file %s (not a method)",
558 ref_index, CHECK);
559 break;
560 }
561 case JVM_REF_invokeStatic:
562 case JVM_REF_invokeSpecial: {
563 check_property(
564 tag.is_method() ||
565 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
566 "Invalid constant pool index %u in class file %s (not a method)",
567 ref_index, CHECK);
568 break;
569 }
570 case JVM_REF_invokeInterface: {
571 check_property(
572 tag.is_interface_method(),
573 "Invalid constant pool index %u in class file %s (not an interface method)",
574 ref_index, CHECK);
575 break;
576 }
577 default: {
578 classfile_parse_error(
579 "Bad method handle kind at constant pool index %u in class file %s",
580 index, THREAD);
581 return;
582 }
583 } // switch(refkind)
584 // Keep the ref_index unchanged. It will be indirected at link-time.
585 break;
586 } // case MethodHandle
587 case JVM_CONSTANT_MethodType: {
588 const int ref_index = cp->method_type_index_at(index);
589 check_property(valid_symbol_at(ref_index),
590 "Invalid constant pool index %u in class file %s",
591 ref_index, CHECK);
592 break;
593 }
594 case JVM_CONSTANT_Dynamic: {
595 const int name_and_type_ref_index =
596 cp->bootstrap_name_and_type_ref_index_at(index);
597
598 check_property(valid_cp_range(name_and_type_ref_index, length) &&
599 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
600 "Invalid constant pool index %u in class file %s",
601 name_and_type_ref_index, CHECK);
602 // bootstrap specifier index must be checked later,
603 // when BootstrapMethods attr is available
604
605 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
606 cp->set_has_dynamic_constant();
607 break;
608 }
609 case JVM_CONSTANT_InvokeDynamic: {
610 const int name_and_type_ref_index =
611 cp->bootstrap_name_and_type_ref_index_at(index);
612
613 check_property(valid_cp_range(name_and_type_ref_index, length) &&
614 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
615 "Invalid constant pool index %u in class file %s",
616 name_and_type_ref_index, CHECK);
617 // bootstrap specifier index must be checked later,
618 // when BootstrapMethods attr is available
619 break;
620 }
621 default: {
622 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
623 ShouldNotReachHere();
624 break;
625 }
626 } // switch(tag)
627 } // end of for
628
629 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
630
631 if (!_need_verify) {
632 return;
633 }
634
635 // second verification pass - checks the strings are of the right format.
636 // but not yet to the other entries
637 for (index = 1; index < length; index++) {
638 const jbyte tag = cp->tag_at(index).value();
639 switch (tag) {
640 case JVM_CONSTANT_UnresolvedClass: {
641 const Symbol* const class_name = cp->klass_name_at(index);
642 // check the name
643 verify_legal_class_name(class_name, CHECK);
644 break;
645 }
646 case JVM_CONSTANT_NameAndType: {
647 if (_need_verify) {
648 const int sig_index = cp->signature_ref_index_at(index);
649 const int name_index = cp->name_ref_index_at(index);
650 const Symbol* const name = cp->symbol_at(name_index);
651 const Symbol* const sig = cp->symbol_at(sig_index);
652 guarantee_property(sig->utf8_length() != 0,
653 "Illegal zero length constant pool entry at %d in class %s",
654 sig_index, CHECK);
655 guarantee_property(name->utf8_length() != 0,
656 "Illegal zero length constant pool entry at %d in class %s",
657 name_index, CHECK);
658
659 if (Signature::is_method(sig)) {
660 // Format check method name and signature
661 verify_legal_method_name(name, CHECK);
662 verify_legal_method_signature(name, sig, CHECK);
663 } else {
664 // Format check field name and signature
665 verify_legal_field_name(name, CHECK);
666 verify_legal_field_signature(name, sig, CHECK);
667 }
668 }
669 break;
670 }
671 case JVM_CONSTANT_Dynamic: {
672 const int name_and_type_ref_index =
673 cp->uncached_name_and_type_ref_index_at(index);
674 // already verified to be utf8
675 const int name_ref_index =
676 cp->name_ref_index_at(name_and_type_ref_index);
677 // already verified to be utf8
678 const int signature_ref_index =
679 cp->signature_ref_index_at(name_and_type_ref_index);
680 const Symbol* const name = cp->symbol_at(name_ref_index);
681 const Symbol* const signature = cp->symbol_at(signature_ref_index);
682 if (_need_verify) {
683 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
684 // Need only to be sure signature is the right type.
685 if (Signature::is_method(signature)) {
686 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
687 }
688 }
689 break;
690 }
691 case JVM_CONSTANT_InvokeDynamic:
692 case JVM_CONSTANT_Fieldref:
693 case JVM_CONSTANT_Methodref:
694 case JVM_CONSTANT_InterfaceMethodref: {
695 const int name_and_type_ref_index =
696 cp->uncached_name_and_type_ref_index_at(index);
697 // already verified to be utf8
698 const int name_ref_index =
699 cp->name_ref_index_at(name_and_type_ref_index);
700 // already verified to be utf8
701 const int signature_ref_index =
702 cp->signature_ref_index_at(name_and_type_ref_index);
703 const Symbol* const name = cp->symbol_at(name_ref_index);
704 const Symbol* const signature = cp->symbol_at(signature_ref_index);
705 if (tag == JVM_CONSTANT_Fieldref) {
706 if (_need_verify) {
707 // Field name and signature are verified above, when iterating NameAndType_info.
708 // Need only to be sure signature is non-zero length and the right type.
709 if (Signature::is_method(signature)) {
710 throwIllegalSignature("Field", name, signature, CHECK);
711 }
712 }
713 } else {
714 if (_need_verify) {
715 // Method name and signature are individually verified above, when iterating
716 // NameAndType_info. Need to check here that signature is non-zero length and
717 // the right type.
718 if (!Signature::is_method(signature)) {
719 throwIllegalSignature("Method", name, signature, CHECK);
720 }
721 }
722 // If a class method name begins with '<', it must be "<init>" and have void signature.
723 const unsigned int name_len = name->utf8_length();
724 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
725 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
726 if (name != vmSymbols::object_initializer_name()) {
727 classfile_parse_error(
728 "Bad method name at constant pool index %u in class file %s",
729 name_ref_index, THREAD);
730 return;
731 } else if (!Signature::is_void_method(signature)) { // must have void signature.
732 throwIllegalSignature("Method", name, signature, CHECK);
733 }
734 }
735 }
736 break;
737 }
738 case JVM_CONSTANT_MethodHandle: {
739 const int ref_index = cp->method_handle_index_at(index);
740 const int ref_kind = cp->method_handle_ref_kind_at(index);
741 switch (ref_kind) {
742 case JVM_REF_invokeVirtual:
743 case JVM_REF_invokeStatic:
744 case JVM_REF_invokeSpecial:
745 case JVM_REF_newInvokeSpecial: {
746 const int name_and_type_ref_index =
747 cp->uncached_name_and_type_ref_index_at(ref_index);
748 const int name_ref_index =
749 cp->name_ref_index_at(name_and_type_ref_index);
750 const Symbol* const name = cp->symbol_at(name_ref_index);
751
752 if (name != vmSymbols::object_initializer_name()) { // !<init>
753 if (ref_kind == JVM_REF_newInvokeSpecial) {
754 classfile_parse_error(
755 "Bad constructor name at constant pool index %u in class file %s",
756 name_ref_index, THREAD);
757 return;
758 }
759 } else { // <init>
760 // The allowed invocation mode of <init> depends on its signature.
761 // This test corresponds to verify_invoke_instructions in the verifier.
762 const int signature_ref_index =
763 cp->signature_ref_index_at(name_and_type_ref_index);
764 const Symbol* const signature = cp->symbol_at(signature_ref_index);
765 if (signature->is_void_method_signature()
766 && ref_kind == JVM_REF_newInvokeSpecial) {
767 // OK, could be a constructor call
768 } else {
769 classfile_parse_error(
770 "Bad method name at constant pool index %u in class file %s",
771 name_ref_index, THREAD);
772 return;
773 }
774 }
775 break;
776 }
777 // Other ref_kinds are already fully checked in previous pass.
778 } // switch(ref_kind)
779 break;
780 }
781 case JVM_CONSTANT_MethodType: {
782 const Symbol* const no_name = vmSymbols::type_name(); // place holder
783 const Symbol* const signature = cp->method_type_signature_at(index);
784 verify_legal_method_signature(no_name, signature, CHECK);
785 break;
786 }
787 case JVM_CONSTANT_Utf8: {
788 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
789 }
790 } // switch(tag)
791 } // end of for
792 }
793
794 class NameSigHash: public ResourceObj {
795 public:
796 const Symbol* _name; // name
797 const Symbol* _sig; // signature
798
799 static const int HASH_ROW_SIZE = 256;
800
801 NameSigHash(Symbol* name, Symbol* sig) :
802 _name(name),
803 _sig(sig) {}
804
805 static unsigned int hash(NameSigHash const& namesig) {
806 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
807 }
808
809 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
810 return (e0._name == e1._name) &&
811 (e0._sig == e1._sig);
812 }
813 };
814
815 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
816 NameSigHash::HASH_ROW_SIZE,
817 AnyObj::RESOURCE_AREA, mtInternal,
818 &NameSigHash::hash, &NameSigHash::equals>;
819
820 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
821 assert(super_type != nullptr,"Method doesn't support null super type");
822 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
823 && super_type->name() != vmSymbols::java_lang_Object()) {
824 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
825 err_msg("Value type %s has an identity type as supertype",
826 current->class_name()->as_klass_external_name()));
827 }
828 }
829
830 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
831 int itfs_len,
832 ConstantPool* cp,
833 bool* const has_nonstatic_concrete_methods,
834 // FIXME: lots of these functions
835 // declare their parameters as const,
836 // which adds only noise to the code.
837 // Remove the spurious const modifiers.
838 // Many are of the form "const int x"
839 // or "T* const x".
840 TRAPS) {
841 assert(stream != nullptr, "invariant");
842 assert(cp != nullptr, "invariant");
843 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
844
845 if (itfs_len == 0) {
846 _local_interfaces = Universe::the_empty_instance_klass_array();
847
848 } else {
849 assert(itfs_len > 0, "only called for len>0");
850 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
851 int index = 0;
852 for (index = 0; index < itfs_len; index++) {
853 const u2 interface_index = stream->get_u2(CHECK);
854 check_property(
855 valid_klass_reference_at(interface_index),
856 "Interface name has bad constant pool index %u in class file %s",
857 interface_index, CHECK);
858 _local_interface_indexes->at_put_grow(index, interface_index);
859 }
860
861 if (!_need_verify || itfs_len <= 1) {
862 return;
863 }
864
865 // Check if there's any duplicates in interfaces
866 ResourceMark rm(THREAD);
867 // Set containing interface names
868 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
869 for (index = 0; index < itfs_len; index++) {
870 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
871 // If no duplicates, add (name, nullptr) in hashtable interface_names.
872 if (!interface_names->put(interface_name, 0)) {
873 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
874 interface_name->as_C_string(), THREAD);
875 return;
876 }
877 }
878 }
879 }
880
881 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
882 int constantvalue_index,
883 int signature_index,
884 TRAPS) const {
885 // Make sure the constant pool entry is of a type appropriate to this field
886 guarantee_property(
887 (constantvalue_index > 0 &&
888 constantvalue_index < cp->length()),
889 "Bad initial value index %u in ConstantValue attribute in class file %s",
890 constantvalue_index, CHECK);
891
892 const constantTag value_type = cp->tag_at(constantvalue_index);
893 switch(cp->basic_type_for_signature_at(signature_index)) {
894 case T_LONG: {
895 guarantee_property(value_type.is_long(),
896 "Inconsistent constant value type in class file %s",
897 CHECK);
898 break;
899 }
900 case T_FLOAT: {
901 guarantee_property(value_type.is_float(),
902 "Inconsistent constant value type in class file %s",
903 CHECK);
904 break;
905 }
906 case T_DOUBLE: {
907 guarantee_property(value_type.is_double(),
908 "Inconsistent constant value type in class file %s",
909 CHECK);
910 break;
911 }
912 case T_BYTE:
913 case T_CHAR:
914 case T_SHORT:
915 case T_BOOLEAN:
916 case T_INT: {
917 guarantee_property(value_type.is_int(),
918 "Inconsistent constant value type in class file %s",
919 CHECK);
920 break;
921 }
922 case T_OBJECT: {
923 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
924 && value_type.is_string()),
925 "Bad string initial value in class file %s",
926 CHECK);
927 break;
928 }
929 default: {
930 classfile_parse_error("Unable to set initial value %u in class file %s",
931 constantvalue_index,
932 THREAD);
933 }
934 }
935 }
936
937 class AnnotationCollector : public ResourceObj{
938 public:
939 enum Location { _in_field, _in_method, _in_class };
940 enum ID {
941 _unknown = 0,
942 _method_CallerSensitive,
943 _method_ForceInline,
944 _method_DontInline,
945 _method_ChangesCurrentThread,
946 _method_JvmtiMountTransition,
947 _method_InjectedProfile,
948 _method_LambdaForm_Compiled,
949 _method_Hidden,
950 _method_Scoped,
951 _method_IntrinsicCandidate,
952 _jdk_internal_vm_annotation_Contended,
953 _field_Stable,
954 _jdk_internal_vm_annotation_ReservedStackAccess,
955 _jdk_internal_ValueBased,
956 _jdk_internal_ImplicitlyConstructible,
957 _jdk_internal_LooselyConsistentValue,
958 _jdk_internal_NullRestricted,
959 _java_lang_Deprecated,
960 _java_lang_Deprecated_for_removal,
961 _annotation_LIMIT
962 };
963 const Location _location;
964 int _annotations_present;
965 u2 _contended_group;
966
967 AnnotationCollector(Location location)
968 : _location(location), _annotations_present(0), _contended_group(0)
969 {
970 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
971 }
972 // If this annotation name has an ID, report it (or _none).
973 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
974 // Set the annotation name:
975 void set_annotation(ID id) {
976 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
977 _annotations_present |= (int)nth_bit((int)id);
978 }
979
980 void remove_annotation(ID id) {
981 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
982 _annotations_present &= (int)~nth_bit((int)id);
983 }
984
985 // Report if the annotation is present.
986 bool has_any_annotations() const { return _annotations_present != 0; }
987 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
988
989 void set_contended_group(u2 group) { _contended_group = group; }
990 u2 contended_group() const { return _contended_group; }
991
992 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
993
994 void set_stable(bool stable) { set_annotation(_field_Stable); }
995 bool is_stable() const { return has_annotation(_field_Stable); }
996 };
997
998 // This class also doubles as a holder for metadata cleanup.
999 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1000 private:
1001 ClassLoaderData* _loader_data;
1002 AnnotationArray* _field_annotations;
1003 AnnotationArray* _field_type_annotations;
1004 public:
1005 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1006 AnnotationCollector(_in_field),
1007 _loader_data(loader_data),
1008 _field_annotations(nullptr),
1009 _field_type_annotations(nullptr) {}
1010 ~FieldAnnotationCollector();
1011 void apply_to(FieldInfo* f);
1012 AnnotationArray* field_annotations() { return _field_annotations; }
1013 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1014
1015 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1016 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1017 };
1018
1019 class MethodAnnotationCollector : public AnnotationCollector{
1020 public:
1021 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1022 void apply_to(const methodHandle& m);
1023 };
1024
1025 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1026 public:
1027 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1028 void apply_to(InstanceKlass* ik);
1029 };
1030
1031
1032 static int skip_annotation_value(const u1*, int, int); // fwd decl
1033
1034 // Safely increment index by val if does not pass limit
1035 #define SAFE_ADD(index, limit, val) \
1036 if (index >= limit - val) return limit; \
1037 index += val;
1038
1039 // Skip an annotation. Return >=limit if there is any problem.
1040 static int skip_annotation(const u1* buffer, int limit, int index) {
1041 assert(buffer != nullptr, "invariant");
1042 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1043 // value := switch (tag:u1) { ... }
1044 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1045 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1046 while (--nmem >= 0 && index < limit) {
1047 SAFE_ADD(index, limit, 2); // skip member
1048 index = skip_annotation_value(buffer, limit, index);
1049 }
1050 return index;
1051 }
1052
1053 // Skip an annotation value. Return >=limit if there is any problem.
1054 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1055 assert(buffer != nullptr, "invariant");
1056
1057 // value := switch (tag:u1) {
1058 // case B, C, I, S, Z, D, F, J, c: con:u2;
1059 // case e: e_class:u2 e_name:u2;
1060 // case s: s_con:u2;
1061 // case [: do(nval:u2) {value};
1062 // case @: annotation;
1063 // case s: s_con:u2;
1064 // }
1065 SAFE_ADD(index, limit, 1); // read tag
1066 const u1 tag = buffer[index - 1];
1067 switch (tag) {
1068 case 'B':
1069 case 'C':
1070 case 'I':
1071 case 'S':
1072 case 'Z':
1073 case 'D':
1074 case 'F':
1075 case 'J':
1076 case 'c':
1077 case 's':
1078 SAFE_ADD(index, limit, 2); // skip con or s_con
1079 break;
1080 case 'e':
1081 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1082 break;
1083 case '[':
1084 {
1085 SAFE_ADD(index, limit, 2); // read nval
1086 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1087 while (--nval >= 0 && index < limit) {
1088 index = skip_annotation_value(buffer, limit, index);
1089 }
1090 }
1091 break;
1092 case '@':
1093 index = skip_annotation(buffer, limit, index);
1094 break;
1095 default:
1096 return limit; // bad tag byte
1097 }
1098 return index;
1099 }
1100
1101 // Sift through annotations, looking for those significant to the VM:
1102 static void parse_annotations(const ConstantPool* const cp,
1103 const u1* buffer, int limit,
1104 AnnotationCollector* coll,
1105 ClassLoaderData* loader_data,
1106 const bool can_access_vm_annotations) {
1107
1108 assert(cp != nullptr, "invariant");
1109 assert(buffer != nullptr, "invariant");
1110 assert(coll != nullptr, "invariant");
1111 assert(loader_data != nullptr, "invariant");
1112
1113 // annotations := do(nann:u2) {annotation}
1114 int index = 2; // read nann
1115 if (index >= limit) return;
1116 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1117 enum { // initial annotation layout
1118 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1119 count_off = 2, // u2 such as 1 (one value)
1120 member_off = 4, // utf8 such as 'value'
1121 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1122 e_tag_val = 'e',
1123 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1124 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1125 e_size = 11, // end of 'e' annotation
1126 c_tag_val = 'c', // payload is type
1127 c_con_off = 7, // utf8 payload, such as 'I'
1128 c_size = 9, // end of 'c' annotation
1129 s_tag_val = 's', // payload is String
1130 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1131 s_size = 9,
1132 b_tag_val = 'Z', // payload is boolean
1133 min_size = 6 // smallest possible size (zero members)
1134 };
1135 // Cannot add min_size to index in case of overflow MAX_INT
1136 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1137 int index0 = index;
1138 index = skip_annotation(buffer, limit, index);
1139 const u1* const abase = buffer + index0;
1140 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1141 const int count = Bytes::get_Java_u2((address)abase + count_off);
1142 const Symbol* const aname = check_symbol_at(cp, atype);
1143 if (aname == nullptr) break; // invalid annotation name
1144 const Symbol* member = nullptr;
1145 if (count >= 1) {
1146 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1147 member = check_symbol_at(cp, member_index);
1148 if (member == nullptr) break; // invalid member name
1149 }
1150
1151 // Here is where parsing particular annotations will take place.
1152 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1153 if (AnnotationCollector::_unknown == id) continue;
1154 coll->set_annotation(id);
1155 if (AnnotationCollector::_java_lang_Deprecated == id) {
1156 assert(count <= 2, "change this if more element-value pairs are added to the @Deprecated annotation");
1157 // @Deprecated can specify forRemoval=true
1158 const u1* offset = abase + member_off;
1159 for (int i = 0; i < count; ++i) {
1160 int member_index = Bytes::get_Java_u2((address)offset);
1161 offset += 2;
1162 member = check_symbol_at(cp, member_index);
1163 if (member == vmSymbols::since()) {
1164 assert(*((address)offset) == s_tag_val, "invariant");
1165 offset += 3;
1166 continue;
1167 }
1168 if (member == vmSymbols::for_removal()) {
1169 assert(*((address)offset) == b_tag_val, "invariant");
1170 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1171 if (cp->int_at(boolean_value_index) == 1) {
1172 // forRemoval == true
1173 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1174 }
1175 break;
1176 }
1177
1178 }
1179 continue;
1180 }
1181
1182 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1183 // @Contended can optionally specify the contention group.
1184 //
1185 // Contended group defines the equivalence class over the fields:
1186 // the fields within the same contended group are not treated distinct.
1187 // The only exception is default group, which does not incur the
1188 // equivalence. Naturally, contention group for classes is meaningless.
1189 //
1190 // While the contention group is specified as String, annotation
1191 // values are already interned, and we might as well use the constant
1192 // pool index as the group tag.
1193 //
1194 u2 group_index = 0; // default contended group
1195 if (count == 1
1196 && s_size == (index - index0) // match size
1197 && s_tag_val == *(abase + tag_off)
1198 && member == vmSymbols::value_name()) {
1199 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1200 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1201 group_index = 0; // default contended group
1202 }
1203 }
1204 coll->set_contended_group(group_index);
1205 }
1206 }
1207 }
1208
1209
1210 // Parse attributes for a field.
1211 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1212 u2 attributes_count,
1213 bool is_static, u2 signature_index,
1214 u2* const constantvalue_index_addr,
1215 bool* const is_synthetic_addr,
1216 u2* const generic_signature_index_addr,
1217 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1218 TRAPS) {
1219 assert(cfs != nullptr, "invariant");
1220 assert(constantvalue_index_addr != nullptr, "invariant");
1221 assert(is_synthetic_addr != nullptr, "invariant");
1222 assert(generic_signature_index_addr != nullptr, "invariant");
1223 assert(parsed_annotations != nullptr, "invariant");
1224 assert(attributes_count > 0, "attributes_count should be greater than 0");
1225
1226 u2 constantvalue_index = 0;
1227 u2 generic_signature_index = 0;
1228 bool is_synthetic = false;
1229 const u1* runtime_visible_annotations = nullptr;
1230 int runtime_visible_annotations_length = 0;
1231 const u1* runtime_invisible_annotations = nullptr;
1232 int runtime_invisible_annotations_length = 0;
1233 const u1* runtime_visible_type_annotations = nullptr;
1234 int runtime_visible_type_annotations_length = 0;
1235 const u1* runtime_invisible_type_annotations = nullptr;
1236 int runtime_invisible_type_annotations_length = 0;
1237 bool runtime_invisible_annotations_exists = false;
1238 bool runtime_invisible_type_annotations_exists = false;
1239 const ConstantPool* const cp = _cp;
1240
1241 while (attributes_count--) {
1242 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1243 const u2 attribute_name_index = cfs->get_u2_fast();
1244 const u4 attribute_length = cfs->get_u4_fast();
1245 check_property(valid_symbol_at(attribute_name_index),
1246 "Invalid field attribute index %u in class file %s",
1247 attribute_name_index,
1248 CHECK);
1249
1250 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1251 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1252 // ignore if non-static
1253 if (constantvalue_index != 0) {
1254 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1255 return;
1256 }
1257 check_property(
1258 attribute_length == 2,
1259 "Invalid ConstantValue field attribute length %u in class file %s",
1260 attribute_length, CHECK);
1261
1262 constantvalue_index = cfs->get_u2(CHECK);
1263 if (_need_verify) {
1264 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1265 }
1266 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1267 if (attribute_length != 0) {
1268 classfile_parse_error(
1269 "Invalid Synthetic field attribute length %u in class file %s",
1270 attribute_length, THREAD);
1271 return;
1272 }
1273 is_synthetic = true;
1274 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1275 if (attribute_length != 0) {
1276 classfile_parse_error(
1277 "Invalid Deprecated field attribute length %u in class file %s",
1278 attribute_length, THREAD);
1279 return;
1280 }
1281 } else if (_major_version >= JAVA_1_5_VERSION) {
1282 if (attribute_name == vmSymbols::tag_signature()) {
1283 if (generic_signature_index != 0) {
1284 classfile_parse_error(
1285 "Multiple Signature attributes for field in class file %s", THREAD);
1286 return;
1287 }
1288 if (attribute_length != 2) {
1289 classfile_parse_error(
1290 "Wrong size %u for field's Signature attribute in class file %s",
1291 attribute_length, THREAD);
1292 return;
1293 }
1294 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1295 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1296 if (runtime_visible_annotations != nullptr) {
1297 classfile_parse_error(
1298 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1299 return;
1300 }
1301 runtime_visible_annotations_length = attribute_length;
1302 runtime_visible_annotations = cfs->current();
1303 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1304 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1305 parse_annotations(cp,
1306 runtime_visible_annotations,
1307 runtime_visible_annotations_length,
1308 parsed_annotations,
1309 _loader_data,
1310 _can_access_vm_annotations);
1311 cfs->skip_u1_fast(runtime_visible_annotations_length);
1312 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1313 if (runtime_invisible_annotations_exists) {
1314 classfile_parse_error(
1315 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1316 return;
1317 }
1318 runtime_invisible_annotations_exists = true;
1319 if (PreserveAllAnnotations) {
1320 runtime_invisible_annotations_length = attribute_length;
1321 runtime_invisible_annotations = cfs->current();
1322 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
1323 }
1324 cfs->skip_u1(attribute_length, CHECK);
1325 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1326 if (runtime_visible_type_annotations != nullptr) {
1327 classfile_parse_error(
1328 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1329 return;
1330 }
1331 runtime_visible_type_annotations_length = attribute_length;
1332 runtime_visible_type_annotations = cfs->current();
1333 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1334 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1335 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1336 if (runtime_invisible_type_annotations_exists) {
1337 classfile_parse_error(
1338 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1339 return;
1340 } else {
1341 runtime_invisible_type_annotations_exists = true;
1342 }
1343 if (PreserveAllAnnotations) {
1344 runtime_invisible_type_annotations_length = attribute_length;
1345 runtime_invisible_type_annotations = cfs->current();
1346 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
1347 }
1348 cfs->skip_u1(attribute_length, CHECK);
1349 } else {
1350 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1351 }
1352 } else {
1353 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1354 }
1355 }
1356
1357 *constantvalue_index_addr = constantvalue_index;
1358 *is_synthetic_addr = is_synthetic;
1359 *generic_signature_index_addr = generic_signature_index;
1360 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1361 runtime_visible_annotations_length,
1362 runtime_invisible_annotations,
1363 runtime_invisible_annotations_length,
1364 CHECK);
1365 parsed_annotations->set_field_annotations(a);
1366 a = assemble_annotations(runtime_visible_type_annotations,
1367 runtime_visible_type_annotations_length,
1368 runtime_invisible_type_annotations,
1369 runtime_invisible_type_annotations_length,
1370 CHECK);
1371 parsed_annotations->set_field_type_annotations(a);
1372 return;
1373 }
1374
1375
1376 // Field allocation types. Used for computing field offsets.
1377
1378 enum FieldAllocationType {
1379 STATIC_OOP, // Oops
1380 STATIC_BYTE, // Boolean, Byte, char
1381 STATIC_SHORT, // shorts
1382 STATIC_WORD, // ints
1383 STATIC_DOUBLE, // aligned long or double
1384 STATIC_INLINE, // inline type field
1385 NONSTATIC_OOP,
1386 NONSTATIC_BYTE,
1387 NONSTATIC_SHORT,
1388 NONSTATIC_WORD,
1389 NONSTATIC_DOUBLE,
1390 NONSTATIC_INLINE,
1391 MAX_FIELD_ALLOCATION_TYPE,
1392 BAD_ALLOCATION_TYPE = -1
1393 };
1394
1395 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1396 BAD_ALLOCATION_TYPE, // 0
1397 BAD_ALLOCATION_TYPE, // 1
1398 BAD_ALLOCATION_TYPE, // 2
1399 BAD_ALLOCATION_TYPE, // 3
1400 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1401 NONSTATIC_SHORT, // T_CHAR = 5,
1402 NONSTATIC_WORD, // T_FLOAT = 6,
1403 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1404 NONSTATIC_BYTE, // T_BYTE = 8,
1405 NONSTATIC_SHORT, // T_SHORT = 9,
1406 NONSTATIC_WORD, // T_INT = 10,
1407 NONSTATIC_DOUBLE, // T_LONG = 11,
1408 NONSTATIC_OOP, // T_OBJECT = 12,
1409 NONSTATIC_OOP, // T_ARRAY = 13,
1410 NONSTATIC_OOP, // T_PRIMITIVE_OBJECT = 14,
1411 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1412 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1413 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1414 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1415 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1416 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1417 BAD_ALLOCATION_TYPE, // 0
1418 BAD_ALLOCATION_TYPE, // 1
1419 BAD_ALLOCATION_TYPE, // 2
1420 BAD_ALLOCATION_TYPE, // 3
1421 STATIC_BYTE , // T_BOOLEAN = 4,
1422 STATIC_SHORT, // T_CHAR = 5,
1423 STATIC_WORD, // T_FLOAT = 6,
1424 STATIC_DOUBLE, // T_DOUBLE = 7,
1425 STATIC_BYTE, // T_BYTE = 8,
1426 STATIC_SHORT, // T_SHORT = 9,
1427 STATIC_WORD, // T_INT = 10,
1428 STATIC_DOUBLE, // T_LONG = 11,
1429 STATIC_OOP, // T_OBJECT = 12,
1430 STATIC_OOP, // T_ARRAY = 13,
1431 STATIC_OOP, // T_PRIMITIVE_OBJECT = 14,
1432 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1433 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1434 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1435 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1436 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1437 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1438 };
1439
1440 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_inline_type) {
1441 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1442 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1443 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1444 if (is_inline_type) {
1445 result = is_static ? STATIC_INLINE : NONSTATIC_INLINE;
1446 }
1447 return result;
1448 }
1449
1450 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1451 public:
1452 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1453
1454 FieldAllocationCount() {
1455 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1456 count[i] = 0;
1457 }
1458 }
1459
1460 void update(bool is_static, BasicType type, bool is_inline_type) {
1461 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_inline_type);
1462 if (atype != BAD_ALLOCATION_TYPE) {
1463 // Make sure there is no overflow with injected fields.
1464 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1465 count[atype]++;
1466 }
1467 }
1468 };
1469
1470 // Side-effects: populates the _fields, _fields_annotations,
1471 // _fields_type_annotations fields
1472 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1473 AccessFlags class_access_flags,
1474 FieldAllocationCount* const fac,
1475 ConstantPool* cp,
1476 const int cp_size,
1477 u2* const java_fields_count_ptr,
1478 TRAPS) {
1479
1480 assert(cfs != nullptr, "invariant");
1481 assert(fac != nullptr, "invariant");
1482 assert(cp != nullptr, "invariant");
1483 assert(java_fields_count_ptr != nullptr, "invariant");
1484
1485 assert(nullptr == _fields_annotations, "invariant");
1486 assert(nullptr == _fields_type_annotations, "invariant");
1487
1488 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1489 cfs->guarantee_more(2, CHECK); // length
1490 const u2 length = cfs->get_u2_fast();
1491 *java_fields_count_ptr = length;
1492
1493 int num_injected = 0;
1494 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1495 &num_injected);
1496
1497 // two more slots are required for inline classes:
1498 // one for the static field with a reference to the pre-allocated default value
1499 // one for the field the JVM injects when detecting an empty inline class
1500 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1501
1502 // Allocate a temporary resource array to collect field data.
1503 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1504 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1505
1506 int instance_fields_count = 0;
1507 ResourceMark rm(THREAD);
1508 for (int n = 0; n < length; n++) {
1509 // access_flags, name_index, descriptor_index, attributes_count
1510 cfs->guarantee_more(8, CHECK);
1511
1512 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1513 if (!supports_inline_types()) {
1514 recognized_modifiers &= ~JVM_ACC_STRICT;
1515 }
1516
1517 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1518 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1519 AccessFlags access_flags;
1520 access_flags.set_flags(flags);
1521 FieldInfo::FieldFlags fieldFlags(0);
1522
1523 const u2 name_index = cfs->get_u2_fast();
1524 check_property(valid_symbol_at(name_index),
1525 "Invalid constant pool index %u for field name in class file %s",
1526 name_index, CHECK);
1527 const Symbol* const name = cp->symbol_at(name_index);
1528 verify_legal_field_name(name, CHECK);
1529
1530 const u2 signature_index = cfs->get_u2_fast();
1531 check_property(valid_symbol_at(signature_index),
1532 "Invalid constant pool index %u for field signature in class file %s",
1533 signature_index, CHECK);
1534 const Symbol* const sig = cp->symbol_at(signature_index);
1535 verify_legal_field_signature(name, sig, CHECK);
1536 if (!access_flags.is_static()) instance_fields_count++;
1537
1538 u2 constantvalue_index = 0;
1539 bool is_synthetic = false;
1540 u2 generic_signature_index = 0;
1541 const bool is_static = access_flags.is_static();
1542 FieldAnnotationCollector parsed_annotations(_loader_data);
1543
1544 bool is_null_restricted = false;
1545
1546 const u2 attributes_count = cfs->get_u2_fast();
1547 if (attributes_count > 0) {
1548 parse_field_attributes(cfs,
1549 attributes_count,
1550 is_static,
1551 signature_index,
1552 &constantvalue_index,
1553 &is_synthetic,
1554 &generic_signature_index,
1555 &parsed_annotations,
1556 CHECK);
1557
1558 if (parsed_annotations.field_annotations() != nullptr) {
1559 if (_fields_annotations == nullptr) {
1560 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1561 _loader_data, length, nullptr,
1562 CHECK);
1563 }
1564 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1565 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1566 if (!Signature::has_envelope(sig)) {
1567 Exceptions::fthrow(
1568 THREAD_AND_LOCATION,
1569 vmSymbols::java_lang_ClassFormatError(),
1570 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s with signature %s (primitive types can never be null)",
1571 name->as_C_string(), sig->as_C_string());
1572 }
1573 is_null_restricted = true;
1574 }
1575 parsed_annotations.set_field_annotations(nullptr);
1576 }
1577 if (parsed_annotations.field_type_annotations() != nullptr) {
1578 if (_fields_type_annotations == nullptr) {
1579 _fields_type_annotations =
1580 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1581 length,
1582 nullptr,
1583 CHECK);
1584 }
1585 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1586 parsed_annotations.set_field_type_annotations(nullptr);
1587 }
1588
1589 if (is_synthetic) {
1590 access_flags.set_is_synthetic();
1591 }
1592 if (generic_signature_index != 0) {
1593 fieldFlags.update_generic(true);
1594 }
1595 }
1596
1597 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1598
1599 // Update FieldAllocationCount for this kind of field
1600 // This use of T_PRIMITIVE_OBJECT is not valid anymore => FIXME (relate to cleanup (removal?) of FiedAllocationCount
1601 fac->update(is_static, type, type == T_PRIMITIVE_OBJECT);
1602
1603 if (is_null_restricted) fieldFlags.update_null_free_inline_type(true);
1604
1605 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1606 fi.set_index(n);
1607 if (fieldFlags.is_generic()) {
1608 fi.set_generic_signature_index(generic_signature_index);
1609 }
1610 parsed_annotations.apply_to(&fi);
1611 if (fi.field_flags().is_contended()) {
1612 _has_contended_fields = true;
1613 }
1614 _temp_field_info->append(fi);
1615 }
1616 assert(_temp_field_info->length() == length, "Must be");
1617
1618 int index = length;
1619 if (num_injected != 0) {
1620 for (int n = 0; n < num_injected; n++) {
1621 // Check for duplicates
1622 if (injected[n].may_be_java) {
1623 const Symbol* const name = injected[n].name();
1624 const Symbol* const signature = injected[n].signature();
1625 bool duplicate = false;
1626 for (int i = 0; i < length; i++) {
1627 const FieldInfo* const f = _temp_field_info->adr_at(i);
1628 if (name == cp->symbol_at(f->name_index()) &&
1629 signature == cp->symbol_at(f->signature_index())) {
1630 // Symbol is desclared in Java so skip this one
1631 duplicate = true;
1632 break;
1633 }
1634 }
1635 if (duplicate) {
1636 // These will be removed from the field array at the end
1637 continue;
1638 }
1639 }
1640
1641 // Injected field
1642 FieldInfo::FieldFlags fflags(0);
1643 fflags.update_injected(true);
1644 AccessFlags aflags;
1645 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1646 fi.set_index(index);
1647 _temp_field_info->append(fi);
1648
1649 // Update FieldAllocationCount for this kind of field
1650 const BasicType type = Signature::basic_type(injected[n].signature());
1651 fac->update(false, type, false);
1652 index++;
1653 }
1654 }
1655
1656 if (is_inline_type) {
1657 // Inject static ".default" field
1658 FieldInfo::FieldFlags fflags(0);
1659 fflags.update_injected(true);
1660 AccessFlags aflags(JVM_ACC_STATIC);
1661 FieldInfo fi(aflags,
1662 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1663 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1664 0,
1665 fflags);
1666 fi.set_index(index);
1667 _temp_field_info->append(fi);
1668
1669 const BasicType type = Signature::basic_type(vmSymbols::object_signature());
1670 fac->update(true, type, false);
1671 index++;
1672 }
1673
1674 if (is_inline_type && instance_fields_count == 0) {
1675 // Inject ".empty" dummy field
1676 _is_empty_inline_type = true;
1677
1678 FieldInfo::FieldFlags fflags(0);
1679 fflags.update_injected(true);
1680 AccessFlags aflags;
1681 FieldInfo fi(aflags,
1682 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(empty_marker_name)),
1683 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(byte_signature)),
1684 0,
1685 fflags);
1686 fi.set_index(index);
1687 _temp_field_info->append(fi);
1688
1689 const BasicType type = Signature::basic_type(vmSymbols::byte_signature());
1690 fac->update(false, type, false);
1691 index++;
1692 }
1693
1694 if (instance_fields_count > 0) {
1695 _has_nonstatic_fields = true;
1696 }
1697
1698 assert(_temp_field_info->length() == index, "Must be");
1699
1700 if (_need_verify && length > 1) {
1701 // Check duplicated fields
1702 ResourceMark rm(THREAD);
1703 // Set containing name-signature pairs
1704 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1705 for (int i = 0; i < _temp_field_info->length(); i++) {
1706 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1707 _temp_field_info->adr_at(i)->signature(_cp));
1708 // If no duplicates, add name/signature in hashtable names_and_sigs.
1709 if(!names_and_sigs->put(name_and_sig, 0)) {
1710 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1711 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1712 return;
1713 }
1714 }
1715 }
1716 }
1717
1718
1719 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1720 u4 code_length,
1721 u4 exception_table_length,
1722 TRAPS) {
1723 assert(cfs != nullptr, "invariant");
1724
1725 const unsafe_u2* const exception_table_start = cfs->current();
1726 assert(exception_table_start != nullptr, "null exception table");
1727
1728 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1729 // end_pc,
1730 // handler_pc,
1731 // catch_type_index
1732
1733 // Will check legal target after parsing code array in verifier.
1734 if (_need_verify) {
1735 for (unsigned int i = 0; i < exception_table_length; i++) {
1736 const u2 start_pc = cfs->get_u2_fast();
1737 const u2 end_pc = cfs->get_u2_fast();
1738 const u2 handler_pc = cfs->get_u2_fast();
1739 const u2 catch_type_index = cfs->get_u2_fast();
1740 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1741 "Illegal exception table range in class file %s",
1742 CHECK_NULL);
1743 guarantee_property(handler_pc < code_length,
1744 "Illegal exception table handler in class file %s",
1745 CHECK_NULL);
1746 if (catch_type_index != 0) {
1747 guarantee_property(valid_klass_reference_at(catch_type_index),
1748 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1749 }
1750 }
1751 } else {
1752 cfs->skip_u2_fast(exception_table_length * 4);
1753 }
1754 return exception_table_start;
1755 }
1756
1757 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1758 u4 code_length,
1759 CompressedLineNumberWriteStream**const write_stream,
1760 TRAPS) {
1761
1762 const ClassFileStream* const cfs = _stream;
1763 unsigned int num_entries = cfs->get_u2(CHECK);
1764
1765 // Each entry is a u2 start_pc, and a u2 line_number
1766 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1767
1768 // Verify line number attribute and table length
1769 check_property(
1770 code_attribute_length == sizeof(u2) + length_in_bytes,
1771 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1772
1773 cfs->guarantee_more(length_in_bytes, CHECK);
1774
1775 if ((*write_stream) == nullptr) {
1776 if (length_in_bytes > fixed_buffer_size) {
1777 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1778 } else {
1779 (*write_stream) = new CompressedLineNumberWriteStream(
1780 _linenumbertable_buffer, fixed_buffer_size);
1781 }
1782 }
1783
1784 while (num_entries-- > 0) {
1785 const u2 bci = cfs->get_u2_fast(); // start_pc
1786 const u2 line = cfs->get_u2_fast(); // line_number
1787 guarantee_property(bci < code_length,
1788 "Invalid pc in LineNumberTable in class file %s", CHECK);
1789 (*write_stream)->write_pair(bci, line);
1790 }
1791 }
1792
1793
1794 class LVT_Hash : public AllStatic {
1795 public:
1796
1797 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1798 /*
1799 * 3-tuple start_bci/length/slot has to be unique key,
1800 * so the following comparison seems to be redundant:
1801 * && elem->name_cp_index == entry->_elem->name_cp_index
1802 */
1803 return (e0.start_bci == e1.start_bci &&
1804 e0.length == e1.length &&
1805 e0.name_cp_index == e1.name_cp_index &&
1806 e0.slot == e1.slot);
1807 }
1808
1809 static unsigned int hash(LocalVariableTableElement const& e0) {
1810 unsigned int raw_hash = e0.start_bci;
1811
1812 raw_hash = e0.length + raw_hash * 37;
1813 raw_hash = e0.name_cp_index + raw_hash * 37;
1814 raw_hash = e0.slot + raw_hash * 37;
1815
1816 return raw_hash;
1817 }
1818 };
1819
1820
1821 // Class file LocalVariableTable elements.
1822 class Classfile_LVT_Element {
1823 public:
1824 u2 start_bci;
1825 u2 length;
1826 u2 name_cp_index;
1827 u2 descriptor_cp_index;
1828 u2 slot;
1829 };
1830
1831 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1832 LocalVariableTableElement* const lvt) {
1833 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1834 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1835 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1836 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1837 lvt->signature_cp_index = 0;
1838 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1839 }
1840
1841 // Function is used to parse both attributes:
1842 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1843 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1844 u4 code_length,
1845 u2 max_locals,
1846 u4 code_attribute_length,
1847 u2* const localvariable_table_length,
1848 bool isLVTT,
1849 TRAPS) {
1850 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1851 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1852 const unsigned int size = checked_cast<unsigned>(
1853 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1854
1855 const ConstantPool* const cp = _cp;
1856
1857 // Verify local variable table attribute has right length
1858 if (_need_verify) {
1859 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1860 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1861 }
1862
1863 const unsafe_u2* const localvariable_table_start = cfs->current();
1864 assert(localvariable_table_start != nullptr, "null local variable table");
1865 if (!_need_verify) {
1866 cfs->skip_u2_fast(size);
1867 } else {
1868 cfs->guarantee_more(size * 2, CHECK_NULL);
1869 for(int i = 0; i < (*localvariable_table_length); i++) {
1870 const u2 start_pc = cfs->get_u2_fast();
1871 const u2 length = cfs->get_u2_fast();
1872 const u2 name_index = cfs->get_u2_fast();
1873 const u2 descriptor_index = cfs->get_u2_fast();
1874 const u2 index = cfs->get_u2_fast();
1875 // Assign to a u4 to avoid overflow
1876 const u4 end_pc = (u4)start_pc + (u4)length;
1877
1878 if (start_pc >= code_length) {
1879 classfile_parse_error(
1880 "Invalid start_pc %u in %s in class file %s",
1881 start_pc, tbl_name, THREAD);
1882 return nullptr;
1883 }
1884 if (end_pc > code_length) {
1885 classfile_parse_error(
1886 "Invalid length %u in %s in class file %s",
1887 length, tbl_name, THREAD);
1888 return nullptr;
1889 }
1890 const int cp_size = cp->length();
1891 guarantee_property(valid_symbol_at(name_index),
1892 "Name index %u in %s has bad constant type in class file %s",
1893 name_index, tbl_name, CHECK_NULL);
1894 guarantee_property(valid_symbol_at(descriptor_index),
1895 "Signature index %u in %s has bad constant type in class file %s",
1896 descriptor_index, tbl_name, CHECK_NULL);
1897
1898 const Symbol* const name = cp->symbol_at(name_index);
1899 const Symbol* const sig = cp->symbol_at(descriptor_index);
1900 verify_legal_field_name(name, CHECK_NULL);
1901 u2 extra_slot = 0;
1902 if (!isLVTT) {
1903 verify_legal_field_signature(name, sig, CHECK_NULL);
1904
1905 // 4894874: check special cases for double and long local variables
1906 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1907 sig == vmSymbols::type_signature(T_LONG)) {
1908 extra_slot = 1;
1909 }
1910 }
1911 guarantee_property((index + extra_slot) < max_locals,
1912 "Invalid index %u in %s in class file %s",
1913 index, tbl_name, CHECK_NULL);
1914 }
1915 }
1916 return localvariable_table_start;
1917 }
1918
1919 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1920 u4 code_attribute_length,
1921 TRAPS) {
1922 assert(cfs != nullptr, "invariant");
1923
1924 if (0 == code_attribute_length) {
1925 return nullptr;
1926 }
1927
1928 const u1* const stackmap_table_start = cfs->current();
1929 assert(stackmap_table_start != nullptr, "null stackmap table");
1930
1931 // check code_attribute_length
1932 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1933
1934 return stackmap_table_start;
1935 }
1936
1937 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1938 u2* const checked_exceptions_length,
1939 u4 method_attribute_length,
1940 TRAPS) {
1941 assert(cfs != nullptr, "invariant");
1942 assert(checked_exceptions_length != nullptr, "invariant");
1943
1944 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1945 *checked_exceptions_length = cfs->get_u2_fast();
1946 const unsigned int size =
1947 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1948 const unsafe_u2* const checked_exceptions_start = cfs->current();
1949 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1950 if (!_need_verify) {
1951 cfs->skip_u2_fast(size);
1952 } else {
1953 // Verify each value in the checked exception table
1954 u2 checked_exception;
1955 const u2 len = *checked_exceptions_length;
1956 cfs->guarantee_more(2 * len, CHECK_NULL);
1957 for (int i = 0; i < len; i++) {
1958 checked_exception = cfs->get_u2_fast();
1959 check_property(
1960 valid_klass_reference_at(checked_exception),
1961 "Exception name has bad type at constant pool %u in class file %s",
1962 checked_exception, CHECK_NULL);
1963 }
1964 }
1965 // check exceptions attribute length
1966 if (_need_verify) {
1967 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1968 sizeof(u2) * size),
1969 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1970 }
1971 return checked_exceptions_start;
1972 }
1973
1974 void ClassFileParser::throwIllegalSignature(const char* type,
1975 const Symbol* name,
1976 const Symbol* sig,
1977 TRAPS) const {
1978 assert(name != nullptr, "invariant");
1979 assert(sig != nullptr, "invariant");
1980
1981 ResourceMark rm(THREAD);
1982 Exceptions::fthrow(THREAD_AND_LOCATION,
1983 vmSymbols::java_lang_ClassFormatError(),
1984 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1985 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1986 }
1987
1988 AnnotationCollector::ID
1989 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1990 const Symbol* name,
1991 const bool can_access_vm_annotations) {
1992 const vmSymbolID sid = vmSymbols::find_sid(name);
1993 // Privileged code can use all annotations. Other code silently drops some.
1994 const bool privileged = loader_data->is_boot_class_loader_data() ||
1995 loader_data->is_platform_class_loader_data() ||
1996 can_access_vm_annotations;
1997 switch (sid) {
1998 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1999 if (_location != _in_method) break; // only allow for methods
2000 if (!privileged) break; // only allow in privileged code
2001 return _method_CallerSensitive;
2002 }
2003 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2004 if (_location != _in_method) break; // only allow for methods
2005 if (!privileged) break; // only allow in privileged code
2006 return _method_ForceInline;
2007 }
2008 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2009 if (_location != _in_method) break; // only allow for methods
2010 if (!privileged) break; // only allow in privileged code
2011 return _method_DontInline;
2012 }
2013 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
2014 if (_location != _in_method) break; // only allow for methods
2015 if (!privileged) break; // only allow in privileged code
2016 return _method_ChangesCurrentThread;
2017 }
2018 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
2019 if (_location != _in_method) break; // only allow for methods
2020 if (!privileged) break; // only allow in privileged code
2021 return _method_JvmtiMountTransition;
2022 }
2023 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2024 if (_location != _in_method) break; // only allow for methods
2025 if (!privileged) break; // only allow in privileged code
2026 return _method_InjectedProfile;
2027 }
2028 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2029 if (_location != _in_method) break; // only allow for methods
2030 if (!privileged) break; // only allow in privileged code
2031 return _method_LambdaForm_Compiled;
2032 }
2033 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2034 if (_location != _in_method) break; // only allow for methods
2035 if (!privileged) break; // only allow in privileged code
2036 return _method_Hidden;
2037 }
2038 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
2039 if (_location != _in_method) break; // only allow for methods
2040 if (!privileged) break; // only allow in privileged code
2041 return _method_Scoped;
2042 }
2043 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
2044 if (_location != _in_method) break; // only allow for methods
2045 if (!privileged) break; // only allow in privileged code
2046 return _method_IntrinsicCandidate;
2047 }
2048 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2049 if (_location != _in_field) break; // only allow for fields
2050 if (!privileged) break; // only allow in privileged code
2051 return _field_Stable;
2052 }
2053 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2054 if (_location != _in_field && _location != _in_class) {
2055 break; // only allow for fields and classes
2056 }
2057 if (!EnableContended || (RestrictContended && !privileged)) {
2058 break; // honor privileges
2059 }
2060 return _jdk_internal_vm_annotation_Contended;
2061 }
2062 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2063 if (_location != _in_method) break; // only allow for methods
2064 if (RestrictReservedStack && !privileged) break; // honor privileges
2065 return _jdk_internal_vm_annotation_ReservedStackAccess;
2066 }
2067 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
2068 if (_location != _in_class) break; // only allow for classes
2069 if (!privileged) break; // only allow in privileged code
2070 return _jdk_internal_ValueBased;
2071 }
2072 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ImplicitlyConstructible_signature): {
2073 if (_location != _in_class) break; // only allow for classes
2074 return _jdk_internal_ImplicitlyConstructible;
2075 }
2076 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2077 if (_location != _in_class) break; // only allow for classes
2078 return _jdk_internal_LooselyConsistentValue;
2079 }
2080 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2081 if (_location != _in_field) break; // only allow for fields
2082 return _jdk_internal_NullRestricted;
2083 }
2084 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2085 return _java_lang_Deprecated;
2086 }
2087 default: {
2088 break;
2089 }
2090 }
2091 return AnnotationCollector::_unknown;
2092 }
2093
2094 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2095 if (is_contended())
2096 // Setting the contended group also sets the contended bit in field flags
2097 f->set_contended_group(contended_group());
2098 if (is_stable())
2099 (f->field_flags_addr())->update_stable(true);
2100 }
2101
2102 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2103 // If there's an error deallocate metadata for field annotations
2104 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2105 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2106 }
2107
2108 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2109 if (has_annotation(_method_CallerSensitive))
2110 m->set_caller_sensitive();
2111 if (has_annotation(_method_ForceInline))
2112 m->set_force_inline();
2113 if (has_annotation(_method_DontInline))
2114 m->set_dont_inline();
2115 if (has_annotation(_method_ChangesCurrentThread))
2116 m->set_changes_current_thread();
2117 if (has_annotation(_method_JvmtiMountTransition))
2118 m->set_jvmti_mount_transition();
2119 if (has_annotation(_method_InjectedProfile))
2120 m->set_has_injected_profile();
2121 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2122 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2123 if (has_annotation(_method_Hidden))
2124 m->set_is_hidden();
2125 if (has_annotation(_method_Scoped))
2126 m->set_scoped();
2127 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2128 m->set_intrinsic_candidate();
2129 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2130 m->set_has_reserved_stack_access();
2131 if (has_annotation(_java_lang_Deprecated))
2132 m->set_deprecated();
2133 if (has_annotation(_java_lang_Deprecated_for_removal))
2134 m->set_deprecated_for_removal();
2135 }
2136
2137 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2138 assert(ik != nullptr, "invariant");
2139 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2140 ik->set_is_contended(is_contended());
2141 }
2142 if (has_annotation(_jdk_internal_ValueBased)) {
2143 ik->set_has_value_based_class_annotation();
2144 if (DiagnoseSyncOnValueBasedClasses) {
2145 ik->set_is_value_based();
2146 }
2147 }
2148 if (has_annotation(_java_lang_Deprecated)) {
2149 Array<Method*>* methods = ik->methods();
2150 int length = ik->methods()->length();
2151 for (int i = 0; i < length; i++) {
2152 Method* m = methods->at(i);
2153 m->set_deprecated();
2154 }
2155 }
2156 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2157 Array<Method*>* methods = ik->methods();
2158 int length = ik->methods()->length();
2159 for (int i = 0; i < length; i++) {
2160 Method* m = methods->at(i);
2161 m->set_deprecated_for_removal();
2162 }
2163 }
2164 }
2165
2166 #define MAX_ARGS_SIZE 255
2167 #define MAX_CODE_SIZE 65535
2168 #define INITIAL_MAX_LVT_NUMBER 256
2169
2170 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2171 *
2172 * Rules for LVT's and LVTT's are:
2173 * - There can be any number of LVT's and LVTT's.
2174 * - If there are n LVT's, it is the same as if there was just
2175 * one LVT containing all the entries from the n LVT's.
2176 * - There may be no more than one LVT entry per local variable.
2177 * Two LVT entries are 'equal' if these fields are the same:
2178 * start_pc, length, name, slot
2179 * - There may be no more than one LVTT entry per each LVT entry.
2180 * Each LVTT entry has to match some LVT entry.
2181 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2182 */
2183 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2184 int lvt_cnt,
2185 u2* const localvariable_table_length,
2186 const unsafe_u2** const localvariable_table_start,
2187 int lvtt_cnt,
2188 u2* const localvariable_type_table_length,
2189 const unsafe_u2** const localvariable_type_table_start,
2190 TRAPS) {
2191
2192 ResourceMark rm(THREAD);
2193
2194 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2195 256, AnyObj::RESOURCE_AREA, mtInternal,
2196 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2197
2198 LVT_HashTable* const table = new LVT_HashTable();
2199
2200 // To fill LocalVariableTable in
2201 const Classfile_LVT_Element* cf_lvt;
2202 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2203
2204 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2205 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2206 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2207 copy_lvt_element(&cf_lvt[idx], lvt);
2208 // If no duplicates, add LVT elem in hashtable.
2209 if (table->put(*lvt, lvt) == false
2210 && _need_verify
2211 && _major_version >= JAVA_1_5_VERSION) {
2212 classfile_parse_error("Duplicated LocalVariableTable attribute "
2213 "entry for '%s' in class file %s",
2214 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2215 THREAD);
2216 return;
2217 }
2218 }
2219 }
2220
2221 // To merge LocalVariableTable and LocalVariableTypeTable
2222 const Classfile_LVT_Element* cf_lvtt;
2223 LocalVariableTableElement lvtt_elem;
2224
2225 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2226 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2227 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2228 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2229 LocalVariableTableElement** entry = table->get(lvtt_elem);
2230 if (entry == nullptr) {
2231 if (_need_verify) {
2232 classfile_parse_error("LVTT entry for '%s' in class file %s "
2233 "does not match any LVT entry",
2234 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2235 THREAD);
2236 return;
2237 }
2238 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2239 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2240 "entry for '%s' in class file %s",
2241 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2242 THREAD);
2243 return;
2244 } else {
2245 // to add generic signatures into LocalVariableTable
2246 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2247 }
2248 }
2249 }
2250 }
2251
2252
2253 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2254 const u1* runtime_visible_annotations,
2255 int runtime_visible_annotations_length,
2256 const u1* runtime_invisible_annotations,
2257 int runtime_invisible_annotations_length,
2258 const u1* runtime_visible_parameter_annotations,
2259 int runtime_visible_parameter_annotations_length,
2260 const u1* runtime_invisible_parameter_annotations,
2261 int runtime_invisible_parameter_annotations_length,
2262 const u1* runtime_visible_type_annotations,
2263 int runtime_visible_type_annotations_length,
2264 const u1* runtime_invisible_type_annotations,
2265 int runtime_invisible_type_annotations_length,
2266 const u1* annotation_default,
2267 int annotation_default_length,
2268 TRAPS) {
2269
2270 AnnotationArray* a;
2271
2272 if (runtime_visible_annotations_length +
2273 runtime_invisible_annotations_length > 0) {
2274 a = assemble_annotations(runtime_visible_annotations,
2275 runtime_visible_annotations_length,
2276 runtime_invisible_annotations,
2277 runtime_invisible_annotations_length,
2278 CHECK);
2279 cm->set_method_annotations(a);
2280 }
2281
2282 if (runtime_visible_parameter_annotations_length +
2283 runtime_invisible_parameter_annotations_length > 0) {
2284 a = assemble_annotations(runtime_visible_parameter_annotations,
2285 runtime_visible_parameter_annotations_length,
2286 runtime_invisible_parameter_annotations,
2287 runtime_invisible_parameter_annotations_length,
2288 CHECK);
2289 cm->set_parameter_annotations(a);
2290 }
2291
2292 if (annotation_default_length > 0) {
2293 a = assemble_annotations(annotation_default,
2294 annotation_default_length,
2295 nullptr,
2296 0,
2297 CHECK);
2298 cm->set_default_annotations(a);
2299 }
2300
2301 if (runtime_visible_type_annotations_length +
2302 runtime_invisible_type_annotations_length > 0) {
2303 a = assemble_annotations(runtime_visible_type_annotations,
2304 runtime_visible_type_annotations_length,
2305 runtime_invisible_type_annotations,
2306 runtime_invisible_type_annotations_length,
2307 CHECK);
2308 cm->set_type_annotations(a);
2309 }
2310 }
2311
2312
2313 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2314 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2315 // Method* to save footprint, so we only know the size of the resulting Method* when the
2316 // entire method attribute is parsed.
2317 //
2318 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2319
2320 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2321 bool is_interface,
2322 bool is_value_class,
2323 bool is_abstract_class,
2324 const ConstantPool* cp,
2325 bool* const has_localvariable_table,
2326 TRAPS) {
2327 assert(cfs != nullptr, "invariant");
2328 assert(cp != nullptr, "invariant");
2329 assert(has_localvariable_table != nullptr, "invariant");
2330
2331 ResourceMark rm(THREAD);
2332 // Parse fixed parts:
2333 // access_flags, name_index, descriptor_index, attributes_count
2334 cfs->guarantee_more(8, CHECK_NULL);
2335
2336 int flags = cfs->get_u2_fast();
2337 const u2 name_index = cfs->get_u2_fast();
2338 const int cp_size = cp->length();
2339 check_property(
2340 valid_symbol_at(name_index),
2341 "Illegal constant pool index %u for method name in class file %s",
2342 name_index, CHECK_NULL);
2343 const Symbol* const name = cp->symbol_at(name_index);
2344 verify_legal_method_name(name, CHECK_NULL);
2345
2346 const u2 signature_index = cfs->get_u2_fast();
2347 guarantee_property(
2348 valid_symbol_at(signature_index),
2349 "Illegal constant pool index %u for method signature in class file %s",
2350 signature_index, CHECK_NULL);
2351 const Symbol* const signature = cp->symbol_at(signature_index);
2352
2353 if (name == vmSymbols::class_initializer_name()) {
2354 // We ignore the other access flags for a valid class initializer.
2355 // (JVM Spec 2nd ed., chapter 4.6)
2356 if (_major_version < 51) { // backward compatibility
2357 flags = JVM_ACC_STATIC;
2358 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2359 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2360 } else {
2361 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2362 return nullptr;
2363 }
2364 } else {
2365 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2366 }
2367
2368 if (name == vmSymbols::object_initializer_name() && is_interface) {
2369 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2370 return nullptr;
2371 }
2372
2373 if (EnableValhalla) {
2374 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2375 && ((flags & JVM_ACC_STATIC) == 0 )
2376 && !_access_flags.is_identity_class()) {
2377 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2378 return nullptr;
2379 }
2380 }
2381
2382 int args_size = -1; // only used when _need_verify is true
2383 if (_need_verify) {
2384 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2385 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2386 verify_legal_method_signature(name, signature, CHECK_NULL);
2387 if (args_size > MAX_ARGS_SIZE) {
2388 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2389 return nullptr;
2390 }
2391 }
2392
2393 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2394
2395 // Default values for code and exceptions attribute elements
2396 u2 max_stack = 0;
2397 u2 max_locals = 0;
2398 u4 code_length = 0;
2399 const u1* code_start = 0;
2400 u2 exception_table_length = 0;
2401 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2402 Array<int>* exception_handlers = Universe::the_empty_int_array();
2403 u2 checked_exceptions_length = 0;
2404 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2405 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2406 int linenumber_table_length = 0;
2407 int total_lvt_length = 0;
2408 u2 lvt_cnt = 0;
2409 u2 lvtt_cnt = 0;
2410 bool lvt_allocated = false;
2411 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2412 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2413 u2* localvariable_table_length = nullptr;
2414 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2415 u2* localvariable_type_table_length = nullptr;
2416 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2417 int method_parameters_length = -1;
2418 const u1* method_parameters_data = nullptr;
2419 bool method_parameters_seen = false;
2420 bool parsed_code_attribute = false;
2421 bool parsed_checked_exceptions_attribute = false;
2422 bool parsed_stackmap_attribute = false;
2423 // stackmap attribute - JDK1.5
2424 const u1* stackmap_data = nullptr;
2425 int stackmap_data_length = 0;
2426 u2 generic_signature_index = 0;
2427 MethodAnnotationCollector parsed_annotations;
2428 const u1* runtime_visible_annotations = nullptr;
2429 int runtime_visible_annotations_length = 0;
2430 const u1* runtime_invisible_annotations = nullptr;
2431 int runtime_invisible_annotations_length = 0;
2432 const u1* runtime_visible_parameter_annotations = nullptr;
2433 int runtime_visible_parameter_annotations_length = 0;
2434 const u1* runtime_invisible_parameter_annotations = nullptr;
2435 int runtime_invisible_parameter_annotations_length = 0;
2436 const u1* runtime_visible_type_annotations = nullptr;
2437 int runtime_visible_type_annotations_length = 0;
2438 const u1* runtime_invisible_type_annotations = nullptr;
2439 int runtime_invisible_type_annotations_length = 0;
2440 bool runtime_invisible_annotations_exists = false;
2441 bool runtime_invisible_type_annotations_exists = false;
2442 bool runtime_invisible_parameter_annotations_exists = false;
2443 const u1* annotation_default = nullptr;
2444 int annotation_default_length = 0;
2445
2446 // Parse code and exceptions attribute
2447 u2 method_attributes_count = cfs->get_u2_fast();
2448 while (method_attributes_count--) {
2449 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2450 const u2 method_attribute_name_index = cfs->get_u2_fast();
2451 const u4 method_attribute_length = cfs->get_u4_fast();
2452 check_property(
2453 valid_symbol_at(method_attribute_name_index),
2454 "Invalid method attribute name index %u in class file %s",
2455 method_attribute_name_index, CHECK_NULL);
2456
2457 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2458 if (method_attribute_name == vmSymbols::tag_code()) {
2459 // Parse Code attribute
2460 if (_need_verify) {
2461 guarantee_property(
2462 !access_flags.is_native() && !access_flags.is_abstract(),
2463 "Code attribute in native or abstract methods in class file %s",
2464 CHECK_NULL);
2465 }
2466 if (parsed_code_attribute) {
2467 classfile_parse_error("Multiple Code attributes in class file %s",
2468 THREAD);
2469 return nullptr;
2470 }
2471 parsed_code_attribute = true;
2472
2473 // Stack size, locals size, and code size
2474 cfs->guarantee_more(8, CHECK_NULL);
2475 max_stack = cfs->get_u2_fast();
2476 max_locals = cfs->get_u2_fast();
2477 code_length = cfs->get_u4_fast();
2478 if (_need_verify) {
2479 guarantee_property(args_size <= max_locals,
2480 "Arguments can't fit into locals in class file %s",
2481 CHECK_NULL);
2482 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2483 "Invalid method Code length %u in class file %s",
2484 code_length, CHECK_NULL);
2485 }
2486 // Code pointer
2487 code_start = cfs->current();
2488 assert(code_start != nullptr, "null code start");
2489 cfs->guarantee_more(code_length, CHECK_NULL);
2490 cfs->skip_u1_fast(code_length);
2491
2492 // Exception handler table
2493 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2494 exception_table_length = cfs->get_u2_fast();
2495 if (exception_table_length > 0) {
2496 exception_table_start = parse_exception_table(cfs,
2497 code_length,
2498 exception_table_length,
2499 CHECK_NULL);
2500 }
2501
2502 // Parse additional attributes in code attribute
2503 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2504 u2 code_attributes_count = cfs->get_u2_fast();
2505
2506 unsigned int calculated_attribute_length = 0;
2507
2508 calculated_attribute_length =
2509 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2510 calculated_attribute_length += checked_cast<unsigned int>(
2511 code_length +
2512 sizeof(exception_table_length) +
2513 sizeof(code_attributes_count) +
2514 exception_table_length *
2515 ( sizeof(u2) + // start_pc
2516 sizeof(u2) + // end_pc
2517 sizeof(u2) + // handler_pc
2518 sizeof(u2) )); // catch_type_index
2519
2520 while (code_attributes_count--) {
2521 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2522 const u2 code_attribute_name_index = cfs->get_u2_fast();
2523 const u4 code_attribute_length = cfs->get_u4_fast();
2524 calculated_attribute_length += code_attribute_length +
2525 (unsigned)sizeof(code_attribute_name_index) +
2526 (unsigned)sizeof(code_attribute_length);
2527 check_property(valid_symbol_at(code_attribute_name_index),
2528 "Invalid code attribute name index %u in class file %s",
2529 code_attribute_name_index,
2530 CHECK_NULL);
2531 if (LoadLineNumberTables &&
2532 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2533 // Parse and compress line number table
2534 parse_linenumber_table(code_attribute_length,
2535 code_length,
2536 &linenumber_table,
2537 CHECK_NULL);
2538
2539 } else if (LoadLocalVariableTables &&
2540 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2541 // Parse local variable table
2542 if (!lvt_allocated) {
2543 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2544 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2545 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2546 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2547 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2548 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2549 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2550 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2551 lvt_allocated = true;
2552 }
2553 if (lvt_cnt == max_lvt_cnt) {
2554 max_lvt_cnt <<= 1;
2555 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2556 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2557 }
2558 localvariable_table_start[lvt_cnt] =
2559 parse_localvariable_table(cfs,
2560 code_length,
2561 max_locals,
2562 code_attribute_length,
2563 &localvariable_table_length[lvt_cnt],
2564 false, // is not LVTT
2565 CHECK_NULL);
2566 total_lvt_length += localvariable_table_length[lvt_cnt];
2567 lvt_cnt++;
2568 } else if (LoadLocalVariableTypeTables &&
2569 _major_version >= JAVA_1_5_VERSION &&
2570 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2571 if (!lvt_allocated) {
2572 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2573 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2574 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2575 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2576 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2577 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2578 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2579 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2580 lvt_allocated = true;
2581 }
2582 // Parse local variable type table
2583 if (lvtt_cnt == max_lvtt_cnt) {
2584 max_lvtt_cnt <<= 1;
2585 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2586 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2587 }
2588 localvariable_type_table_start[lvtt_cnt] =
2589 parse_localvariable_table(cfs,
2590 code_length,
2591 max_locals,
2592 code_attribute_length,
2593 &localvariable_type_table_length[lvtt_cnt],
2594 true, // is LVTT
2595 CHECK_NULL);
2596 lvtt_cnt++;
2597 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2598 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2599 // Stack map is only needed by the new verifier in JDK1.5.
2600 if (parsed_stackmap_attribute) {
2601 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2602 return nullptr;
2603 }
2604 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2605 stackmap_data_length = code_attribute_length;
2606 parsed_stackmap_attribute = true;
2607 } else {
2608 // Skip unknown attributes
2609 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2610 }
2611 }
2612 // check method attribute length
2613 if (_need_verify) {
2614 guarantee_property(method_attribute_length == calculated_attribute_length,
2615 "Code segment has wrong length in class file %s",
2616 CHECK_NULL);
2617 }
2618 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2619 // Parse Exceptions attribute
2620 if (parsed_checked_exceptions_attribute) {
2621 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2622 THREAD);
2623 return nullptr;
2624 }
2625 parsed_checked_exceptions_attribute = true;
2626 checked_exceptions_start =
2627 parse_checked_exceptions(cfs,
2628 &checked_exceptions_length,
2629 method_attribute_length,
2630 CHECK_NULL);
2631 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2632 // reject multiple method parameters
2633 if (method_parameters_seen) {
2634 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2635 THREAD);
2636 return nullptr;
2637 }
2638 method_parameters_seen = true;
2639 method_parameters_length = cfs->get_u1_fast();
2640 const u4 real_length = (method_parameters_length * 4u) + 1u;
2641 if (method_attribute_length != real_length) {
2642 classfile_parse_error(
2643 "Invalid MethodParameters method attribute length %u in class file",
2644 method_attribute_length, THREAD);
2645 return nullptr;
2646 }
2647 method_parameters_data = cfs->current();
2648 cfs->skip_u2_fast(method_parameters_length);
2649 cfs->skip_u2_fast(method_parameters_length);
2650 // ignore this attribute if it cannot be reflected
2651 if (!vmClasses::Parameter_klass_loaded())
2652 method_parameters_length = -1;
2653 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2654 if (method_attribute_length != 0) {
2655 classfile_parse_error(
2656 "Invalid Synthetic method attribute length %u in class file %s",
2657 method_attribute_length, THREAD);
2658 return nullptr;
2659 }
2660 // Should we check that there hasn't already been a synthetic attribute?
2661 access_flags.set_is_synthetic();
2662 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2663 if (method_attribute_length != 0) {
2664 classfile_parse_error(
2665 "Invalid Deprecated method attribute length %u in class file %s",
2666 method_attribute_length, THREAD);
2667 return nullptr;
2668 }
2669 } else if (_major_version >= JAVA_1_5_VERSION) {
2670 if (method_attribute_name == vmSymbols::tag_signature()) {
2671 if (generic_signature_index != 0) {
2672 classfile_parse_error(
2673 "Multiple Signature attributes for method in class file %s",
2674 THREAD);
2675 return nullptr;
2676 }
2677 if (method_attribute_length != 2) {
2678 classfile_parse_error(
2679 "Invalid Signature attribute length %u in class file %s",
2680 method_attribute_length, THREAD);
2681 return nullptr;
2682 }
2683 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2684 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2685 if (runtime_visible_annotations != nullptr) {
2686 classfile_parse_error(
2687 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2688 THREAD);
2689 return nullptr;
2690 }
2691 runtime_visible_annotations_length = method_attribute_length;
2692 runtime_visible_annotations = cfs->current();
2693 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2694 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2695 parse_annotations(cp,
2696 runtime_visible_annotations,
2697 runtime_visible_annotations_length,
2698 &parsed_annotations,
2699 _loader_data,
2700 _can_access_vm_annotations);
2701 cfs->skip_u1_fast(runtime_visible_annotations_length);
2702 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2703 if (runtime_invisible_annotations_exists) {
2704 classfile_parse_error(
2705 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2706 THREAD);
2707 return nullptr;
2708 }
2709 runtime_invisible_annotations_exists = true;
2710 if (PreserveAllAnnotations) {
2711 runtime_invisible_annotations_length = method_attribute_length;
2712 runtime_invisible_annotations = cfs->current();
2713 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
2714 }
2715 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2716 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2717 if (runtime_visible_parameter_annotations != nullptr) {
2718 classfile_parse_error(
2719 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2720 THREAD);
2721 return nullptr;
2722 }
2723 runtime_visible_parameter_annotations_length = method_attribute_length;
2724 runtime_visible_parameter_annotations = cfs->current();
2725 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2726 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2727 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2728 if (runtime_invisible_parameter_annotations_exists) {
2729 classfile_parse_error(
2730 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2731 THREAD);
2732 return nullptr;
2733 }
2734 runtime_invisible_parameter_annotations_exists = true;
2735 if (PreserveAllAnnotations) {
2736 runtime_invisible_parameter_annotations_length = method_attribute_length;
2737 runtime_invisible_parameter_annotations = cfs->current();
2738 assert(runtime_invisible_parameter_annotations != nullptr,
2739 "null invisible parameter annotations");
2740 }
2741 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2742 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2743 if (annotation_default != nullptr) {
2744 classfile_parse_error(
2745 "Multiple AnnotationDefault attributes for method in class file %s",
2746 THREAD);
2747 return nullptr;
2748 }
2749 annotation_default_length = method_attribute_length;
2750 annotation_default = cfs->current();
2751 assert(annotation_default != nullptr, "null annotation default");
2752 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2753 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2754 if (runtime_visible_type_annotations != nullptr) {
2755 classfile_parse_error(
2756 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2757 THREAD);
2758 return nullptr;
2759 }
2760 runtime_visible_type_annotations_length = method_attribute_length;
2761 runtime_visible_type_annotations = cfs->current();
2762 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2763 // No need for the VM to parse Type annotations
2764 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2765 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2766 if (runtime_invisible_type_annotations_exists) {
2767 classfile_parse_error(
2768 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2769 THREAD);
2770 return nullptr;
2771 } else {
2772 runtime_invisible_type_annotations_exists = true;
2773 }
2774 if (PreserveAllAnnotations) {
2775 runtime_invisible_type_annotations_length = method_attribute_length;
2776 runtime_invisible_type_annotations = cfs->current();
2777 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
2778 }
2779 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2780 } else {
2781 // Skip unknown attributes
2782 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2783 }
2784 } else {
2785 // Skip unknown attributes
2786 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2787 }
2788 }
2789
2790 if (linenumber_table != nullptr) {
2791 linenumber_table->write_terminator();
2792 linenumber_table_length = linenumber_table->position();
2793 }
2794
2795 // Make sure there's at least one Code attribute in non-native/non-abstract method
2796 if (_need_verify) {
2797 guarantee_property(access_flags.is_native() ||
2798 access_flags.is_abstract() ||
2799 parsed_code_attribute,
2800 "Absent Code attribute in method that is not native or abstract in class file %s",
2801 CHECK_NULL);
2802 }
2803
2804 // All sizing information for a Method* is finally available, now create it
2805 InlineTableSizes sizes(
2806 total_lvt_length,
2807 linenumber_table_length,
2808 exception_table_length,
2809 checked_exceptions_length,
2810 method_parameters_length,
2811 generic_signature_index,
2812 runtime_visible_annotations_length +
2813 runtime_invisible_annotations_length,
2814 runtime_visible_parameter_annotations_length +
2815 runtime_invisible_parameter_annotations_length,
2816 runtime_visible_type_annotations_length +
2817 runtime_invisible_type_annotations_length,
2818 annotation_default_length,
2819 0);
2820
2821 Method* const m = Method::allocate(_loader_data,
2822 code_length,
2823 access_flags,
2824 &sizes,
2825 ConstMethod::NORMAL,
2826 _cp->symbol_at(name_index),
2827 CHECK_NULL);
2828
2829 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2830
2831 // Fill in information from fixed part (access_flags already set)
2832 m->set_constants(_cp);
2833 m->set_name_index(name_index);
2834 m->set_signature_index(signature_index);
2835 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2836 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2837
2838 // Fill in code attribute information
2839 m->set_max_stack(max_stack);
2840 m->set_max_locals(max_locals);
2841 if (stackmap_data != nullptr) {
2842 m->constMethod()->copy_stackmap_data(_loader_data,
2843 (u1*)stackmap_data,
2844 stackmap_data_length,
2845 CHECK_NULL);
2846 }
2847
2848 // Copy byte codes
2849 m->set_code((u1*)code_start);
2850
2851 // Copy line number table
2852 if (linenumber_table != nullptr) {
2853 memcpy(m->compressed_linenumber_table(),
2854 linenumber_table->buffer(),
2855 linenumber_table_length);
2856 }
2857
2858 // Copy exception table
2859 if (exception_table_length > 0) {
2860 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2861 m->exception_table_start(),
2862 exception_table_length * sizeof(ExceptionTableElement),
2863 sizeof(u2));
2864 }
2865
2866 // Copy method parameters
2867 if (method_parameters_length > 0) {
2868 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2869 for (int i = 0; i < method_parameters_length; i++) {
2870 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2871 method_parameters_data += 2;
2872 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2873 method_parameters_data += 2;
2874 }
2875 }
2876
2877 // Copy checked exceptions
2878 if (checked_exceptions_length > 0) {
2879 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2880 m->checked_exceptions_start(),
2881 checked_exceptions_length * sizeof(CheckedExceptionElement),
2882 sizeof(u2));
2883 }
2884
2885 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2886 if (total_lvt_length > 0) {
2887 *has_localvariable_table = true;
2888 copy_localvariable_table(m->constMethod(),
2889 lvt_cnt,
2890 localvariable_table_length,
2891 localvariable_table_start,
2892 lvtt_cnt,
2893 localvariable_type_table_length,
2894 localvariable_type_table_start,
2895 CHECK_NULL);
2896 }
2897
2898 if (parsed_annotations.has_any_annotations())
2899 parsed_annotations.apply_to(methodHandle(THREAD, m));
2900
2901 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2902 m->set_is_hidden();
2903 }
2904
2905 // Copy annotations
2906 copy_method_annotations(m->constMethod(),
2907 runtime_visible_annotations,
2908 runtime_visible_annotations_length,
2909 runtime_invisible_annotations,
2910 runtime_invisible_annotations_length,
2911 runtime_visible_parameter_annotations,
2912 runtime_visible_parameter_annotations_length,
2913 runtime_invisible_parameter_annotations,
2914 runtime_invisible_parameter_annotations_length,
2915 runtime_visible_type_annotations,
2916 runtime_visible_type_annotations_length,
2917 runtime_invisible_type_annotations,
2918 runtime_invisible_type_annotations_length,
2919 annotation_default,
2920 annotation_default_length,
2921 CHECK_NULL);
2922
2923 if (InstanceKlass::is_finalization_enabled() &&
2924 name == vmSymbols::finalize_method_name() &&
2925 signature == vmSymbols::void_method_signature()) {
2926 if (m->is_empty_method()) {
2927 _has_empty_finalizer = true;
2928 } else {
2929 _has_finalizer = true;
2930 }
2931 }
2932 if (name == vmSymbols::object_initializer_name() &&
2933 signature == vmSymbols::void_method_signature() &&
2934 m->is_vanilla_constructor()) {
2935 _has_vanilla_constructor = true;
2936 }
2937
2938 NOT_PRODUCT(m->verify());
2939 return m;
2940 }
2941
2942
2943 // Side-effects: populates the _methods field in the parser
2944 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2945 bool is_interface,
2946 bool is_value_class,
2947 bool is_abstract_type,
2948 bool* const has_localvariable_table,
2949 bool* has_final_method,
2950 bool* declares_nonstatic_concrete_methods,
2951 TRAPS) {
2952 assert(cfs != nullptr, "invariant");
2953 assert(has_localvariable_table != nullptr, "invariant");
2954 assert(has_final_method != nullptr, "invariant");
2955 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2956
2957 assert(nullptr == _methods, "invariant");
2958
2959 cfs->guarantee_more(2, CHECK); // length
2960 const u2 length = cfs->get_u2_fast();
2961 if (length == 0) {
2962 _methods = Universe::the_empty_method_array();
2963 } else {
2964 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2965 length,
2966 nullptr,
2967 CHECK);
2968
2969 for (int index = 0; index < length; index++) {
2970 Method* method = parse_method(cfs,
2971 is_interface,
2972 is_value_class,
2973 is_abstract_type,
2974 _cp,
2975 has_localvariable_table,
2976 CHECK);
2977
2978 if (method->is_final()) {
2979 *has_final_method = true;
2980 }
2981 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2982 // used for interface initialization, and default method inheritance analysis
2983 if (is_interface && !(*declares_nonstatic_concrete_methods)
2984 && !method->is_abstract() && !method->is_static()) {
2985 *declares_nonstatic_concrete_methods = true;
2986 }
2987 _methods->at_put(index, method);
2988 }
2989
2990 if (_need_verify && length > 1) {
2991 // Check duplicated methods
2992 ResourceMark rm(THREAD);
2993 // Set containing name-signature pairs
2994 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2995 for (int i = 0; i < length; i++) {
2996 const Method* const m = _methods->at(i);
2997 NameSigHash name_and_sig(m->name(), m->signature());
2998 // If no duplicates, add name/signature in hashtable names_and_sigs.
2999 if(!names_and_sigs->put(name_and_sig, 0)) {
3000 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3001 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
3002 return;
3003 }
3004 }
3005 }
3006 }
3007 }
3008
3009 static const intArray* sort_methods(Array<Method*>* methods) {
3010 const int length = methods->length();
3011 // If JVMTI original method ordering or sharing is enabled we have to
3012 // remember the original class file ordering.
3013 // We temporarily use the vtable_index field in the Method* to store the
3014 // class file index, so we can read in after calling qsort.
3015 // Put the method ordering in the shared archive.
3016 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
3017 for (int index = 0; index < length; index++) {
3018 Method* const m = methods->at(index);
3019 assert(!m->valid_vtable_index(), "vtable index should not be set");
3020 m->set_vtable_index(index);
3021 }
3022 }
3023 // Sort method array by ascending method name (for faster lookups & vtable construction)
3024 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3025 Method::sort_methods(methods);
3026
3027 intArray* method_ordering = nullptr;
3028 // If JVMTI original method ordering or sharing is enabled construct int
3029 // array remembering the original ordering
3030 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
3031 method_ordering = new intArray(length, length, -1);
3032 for (int index = 0; index < length; index++) {
3033 Method* const m = methods->at(index);
3034 const int old_index = m->vtable_index();
3035 assert(old_index >= 0 && old_index < length, "invalid method index");
3036 method_ordering->at_put(index, old_index);
3037 m->set_vtable_index(Method::invalid_vtable_index);
3038 }
3039 }
3040 return method_ordering;
3041 }
3042
3043 // Parse generic_signature attribute for methods and fields
3044 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3045 TRAPS) {
3046 assert(cfs != nullptr, "invariant");
3047
3048 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3049 const u2 generic_signature_index = cfs->get_u2_fast();
3050 check_property(
3051 valid_symbol_at(generic_signature_index),
3052 "Invalid Signature attribute at constant pool index %u in class file %s",
3053 generic_signature_index, CHECK_0);
3054 return generic_signature_index;
3055 }
3056
3057 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3058 TRAPS) {
3059
3060 assert(cfs != nullptr, "invariant");
3061
3062 cfs->guarantee_more(2, CHECK); // sourcefile_index
3063 const u2 sourcefile_index = cfs->get_u2_fast();
3064 check_property(
3065 valid_symbol_at(sourcefile_index),
3066 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3067 sourcefile_index, CHECK);
3068 set_class_sourcefile_index(sourcefile_index);
3069 }
3070
3071 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3072 int length,
3073 TRAPS) {
3074 assert(cfs != nullptr, "invariant");
3075
3076 const u1* const sde_buffer = cfs->current();
3077 assert(sde_buffer != nullptr, "null sde buffer");
3078
3079 // Don't bother storing it if there is no way to retrieve it
3080 if (JvmtiExport::can_get_source_debug_extension()) {
3081 assert((length+1) > length, "Overflow checking");
3082 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3083 for (int i = 0; i < length; i++) {
3084 sde[i] = sde_buffer[i];
3085 }
3086 sde[length] = '\0';
3087 set_class_sde_buffer((const char*)sde, length);
3088 }
3089 // Got utf8 string, set stream position forward
3090 cfs->skip_u1(length, CHECK);
3091 }
3092
3093
3094 // Inner classes can be static, private or protected (classic VM does this)
3095 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3096 JVM_ACC_PRIVATE | \
3097 JVM_ACC_PROTECTED | \
3098 JVM_ACC_STATIC \
3099 )
3100
3101 // Find index of the InnerClasses entry for the specified inner_class_info_index.
3102 // Return -1 if none is found.
3103 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3104 Symbol* cp_klass_name = cp->klass_name_at(inner);
3105 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3106 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3107 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3108 return idx;
3109 }
3110 }
3111 return -1;
3112 }
3113
3114 // Return the outer_class_info_index for the InnerClasses entry containing the
3115 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
3116 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3117 if (inner == 0) return -1;
3118 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3119 if (idx == -1) return -1;
3120 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3121 return result;
3122 }
3123
3124 // Return true if circularity is found, false if no circularity is found.
3125 // Use Floyd's cycle finding algorithm.
3126 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3127 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3128 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3129
3130 while (fast != -1 && fast != 0) {
3131 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3132 return true; // found a circularity
3133 }
3134 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3135 if (fast == -1) return false;
3136 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3137 if (fast == -1) return false;
3138 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3139 assert(slow != -1, "sanity check");
3140 }
3141 return false;
3142 }
3143
3144 // Loop through each InnerClasses entry checking for circularities and duplications
3145 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3146 // return true if a circularity or entries with duplicate inner_class_info_indexes
3147 // are found.
3148 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3149 // Loop through each InnerClasses entry.
3150 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3151 // Return true if there are circular entries.
3152 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3153 return true;
3154 }
3155 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3156 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3157 y += InstanceKlass::inner_class_next_offset) {
3158
3159 // 4347400: make sure there's no duplicate entry in the classes array
3160 if (_major_version >= JAVA_1_5_VERSION) {
3161 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3162 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3163 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3164 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3165 "Duplicate entry in InnerClasses attribute in class file %s",
3166 CHECK_(true));
3167 }
3168 // Return true if there are two entries with the same inner_class_info_index.
3169 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3170 return true;
3171 }
3172 }
3173 }
3174 return false;
3175 }
3176
3177 // Return number of classes in the inner classes attribute table
3178 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3179 const ConstantPool* cp,
3180 const u1* const inner_classes_attribute_start,
3181 bool parsed_enclosingmethod_attribute,
3182 u2 enclosing_method_class_index,
3183 u2 enclosing_method_method_index,
3184 TRAPS) {
3185 const u1* const current_mark = cfs->current();
3186 u2 length = 0;
3187 if (inner_classes_attribute_start != nullptr) {
3188 cfs->set_current(inner_classes_attribute_start);
3189 cfs->guarantee_more(2, CHECK_0); // length
3190 length = cfs->get_u2_fast();
3191 }
3192
3193 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3194 // method data:
3195 // [inner_class_info_index,
3196 // outer_class_info_index,
3197 // inner_name_index,
3198 // inner_class_access_flags,
3199 // ...
3200 // enclosing_method_class_index,
3201 // enclosing_method_method_index]
3202 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3203 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3204 _inner_classes = inner_classes;
3205
3206 int index = 0;
3207 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3208 for (int n = 0; n < length; n++) {
3209 // Inner class index
3210 const u2 inner_class_info_index = cfs->get_u2_fast();
3211 check_property(
3212 valid_klass_reference_at(inner_class_info_index),
3213 "inner_class_info_index %u has bad constant type in class file %s",
3214 inner_class_info_index, CHECK_0);
3215 // Outer class index
3216 const u2 outer_class_info_index = cfs->get_u2_fast();
3217 check_property(
3218 outer_class_info_index == 0 ||
3219 valid_klass_reference_at(outer_class_info_index),
3220 "outer_class_info_index %u has bad constant type in class file %s",
3221 outer_class_info_index, CHECK_0);
3222
3223 if (outer_class_info_index != 0) {
3224 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3225 char* bytes = (char*)outer_class_name->bytes();
3226 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3227 "Outer class is an array class in class file %s", CHECK_0);
3228 }
3229 // Inner class name
3230 const u2 inner_name_index = cfs->get_u2_fast();
3231 check_property(
3232 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3233 "inner_name_index %u has bad constant type in class file %s",
3234 inner_name_index, CHECK_0);
3235 if (_need_verify) {
3236 guarantee_property(inner_class_info_index != outer_class_info_index,
3237 "Class is both outer and inner class in class file %s", CHECK_0);
3238 }
3239
3240 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3241 // JVM_ACC_MODULE is defined in JDK-9 and later.
3242 if (_major_version >= JAVA_9_VERSION) {
3243 recognized_modifiers |= JVM_ACC_MODULE;
3244 }
3245
3246 // Access flags
3247 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3248
3249 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3250 // Set abstract bit for old class files for backward compatibility
3251 flags |= JVM_ACC_ABSTRACT;
3252 }
3253
3254 if (!supports_inline_types()) {
3255 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3256 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3257 if (!is_module && !is_interface) {
3258 flags |= JVM_ACC_IDENTITY;
3259 }
3260 }
3261
3262 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3263 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3264 AccessFlags inner_access_flags(flags);
3265
3266 inner_classes->at_put(index++, inner_class_info_index);
3267 inner_classes->at_put(index++, outer_class_info_index);
3268 inner_classes->at_put(index++, inner_name_index);
3269 inner_classes->at_put(index++, inner_access_flags.as_short());
3270 }
3271
3272 // Check for circular and duplicate entries.
3273 bool has_circularity = false;
3274 if (_need_verify) {
3275 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3276 if (has_circularity) {
3277 // If circularity check failed then ignore InnerClasses attribute.
3278 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3279 index = 0;
3280 if (parsed_enclosingmethod_attribute) {
3281 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3282 _inner_classes = inner_classes;
3283 } else {
3284 _inner_classes = Universe::the_empty_short_array();
3285 }
3286 }
3287 }
3288 // Set EnclosingMethod class and method indexes.
3289 if (parsed_enclosingmethod_attribute) {
3290 inner_classes->at_put(index++, enclosing_method_class_index);
3291 inner_classes->at_put(index++, enclosing_method_method_index);
3292 }
3293 assert(index == size || has_circularity, "wrong size");
3294
3295 // Restore buffer's current position.
3296 cfs->set_current(current_mark);
3297
3298 return length;
3299 }
3300
3301 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3302 const u1* const nest_members_attribute_start,
3303 TRAPS) {
3304 const u1* const current_mark = cfs->current();
3305 u2 length = 0;
3306 if (nest_members_attribute_start != nullptr) {
3307 cfs->set_current(nest_members_attribute_start);
3308 cfs->guarantee_more(2, CHECK_0); // length
3309 length = cfs->get_u2_fast();
3310 }
3311 const int size = length;
3312 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3313 _nest_members = nest_members;
3314
3315 int index = 0;
3316 cfs->guarantee_more(2 * length, CHECK_0);
3317 for (int n = 0; n < length; n++) {
3318 const u2 class_info_index = cfs->get_u2_fast();
3319 check_property(
3320 valid_klass_reference_at(class_info_index),
3321 "Nest member class_info_index %u has bad constant type in class file %s",
3322 class_info_index, CHECK_0);
3323 nest_members->at_put(index++, class_info_index);
3324 }
3325 assert(index == size, "wrong size");
3326
3327 // Restore buffer's current position.
3328 cfs->set_current(current_mark);
3329
3330 return length;
3331 }
3332
3333 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3334 const u1* const permitted_subclasses_attribute_start,
3335 TRAPS) {
3336 const u1* const current_mark = cfs->current();
3337 u2 length = 0;
3338 if (permitted_subclasses_attribute_start != nullptr) {
3339 cfs->set_current(permitted_subclasses_attribute_start);
3340 cfs->guarantee_more(2, CHECK_0); // length
3341 length = cfs->get_u2_fast();
3342 }
3343 const int size = length;
3344 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3345 _permitted_subclasses = permitted_subclasses;
3346
3347 if (length > 0) {
3348 int index = 0;
3349 cfs->guarantee_more(2 * length, CHECK_0);
3350 for (int n = 0; n < length; n++) {
3351 const u2 class_info_index = cfs->get_u2_fast();
3352 check_property(
3353 valid_klass_reference_at(class_info_index),
3354 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3355 class_info_index, CHECK_0);
3356 permitted_subclasses->at_put(index++, class_info_index);
3357 }
3358 assert(index == size, "wrong size");
3359 }
3360
3361 // Restore buffer's current position.
3362 cfs->set_current(current_mark);
3363
3364 return length;
3365 }
3366
3367 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3368 const u1* const loadable_descriptors_attribute_start,
3369 TRAPS) {
3370 const u1* const current_mark = cfs->current();
3371 u2 length = 0;
3372 if (loadable_descriptors_attribute_start != nullptr) {
3373 cfs->set_current(loadable_descriptors_attribute_start);
3374 cfs->guarantee_more(2, CHECK_0); // length
3375 length = cfs->get_u2_fast();
3376 }
3377 const int size = length;
3378 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3379 _loadable_descriptors = loadable_descriptors;
3380 if (length > 0) {
3381 int index = 0;
3382 cfs->guarantee_more(2 * length, CHECK_0);
3383 for (int n = 0; n < length; n++) {
3384 const u2 descriptor_index = cfs->get_u2_fast();
3385 check_property(
3386 valid_symbol_at(descriptor_index),
3387 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3388 descriptor_index, CHECK_0);
3389 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3390 bool valid = legal_field_signature(descriptor, CHECK_0);
3391 if(!valid) {
3392 ResourceMark rm(THREAD);
3393 Exceptions::fthrow(THREAD_AND_LOCATION,
3394 vmSymbols::java_lang_ClassFormatError(),
3395 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3396 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3397 return 0;
3398 }
3399 loadable_descriptors->at_put(index++, descriptor_index);
3400 }
3401 assert(index == size, "wrong size");
3402 }
3403
3404 // Restore buffer's current position.
3405 cfs->set_current(current_mark);
3406
3407 return length;
3408 }
3409
3410 // Record {
3411 // u2 attribute_name_index;
3412 // u4 attribute_length;
3413 // u2 components_count;
3414 // component_info components[components_count];
3415 // }
3416 // component_info {
3417 // u2 name_index;
3418 // u2 descriptor_index
3419 // u2 attributes_count;
3420 // attribute_info_attributes[attributes_count];
3421 // }
3422 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3423 const ConstantPool* cp,
3424 const u1* const record_attribute_start,
3425 TRAPS) {
3426 const u1* const current_mark = cfs->current();
3427 int components_count = 0;
3428 unsigned int calculate_attr_size = 0;
3429 if (record_attribute_start != nullptr) {
3430 cfs->set_current(record_attribute_start);
3431 cfs->guarantee_more(2, CHECK_0); // num of components
3432 components_count = (int)cfs->get_u2_fast();
3433 calculate_attr_size = 2;
3434 }
3435
3436 Array<RecordComponent*>* const record_components =
3437 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3438 _record_components = record_components;
3439
3440 for (int x = 0; x < components_count; x++) {
3441 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3442
3443 const u2 name_index = cfs->get_u2_fast();
3444 check_property(valid_symbol_at(name_index),
3445 "Invalid constant pool index %u for name in Record attribute in class file %s",
3446 name_index, CHECK_0);
3447 const Symbol* const name = cp->symbol_at(name_index);
3448 verify_legal_field_name(name, CHECK_0);
3449
3450 const u2 descriptor_index = cfs->get_u2_fast();
3451 check_property(valid_symbol_at(descriptor_index),
3452 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3453 descriptor_index, CHECK_0);
3454 const Symbol* const descr = cp->symbol_at(descriptor_index);
3455 verify_legal_field_signature(name, descr, CHECK_0);
3456
3457 const u2 attributes_count = cfs->get_u2_fast();
3458 calculate_attr_size += 6;
3459 u2 generic_sig_index = 0;
3460 const u1* runtime_visible_annotations = nullptr;
3461 int runtime_visible_annotations_length = 0;
3462 const u1* runtime_invisible_annotations = nullptr;
3463 int runtime_invisible_annotations_length = 0;
3464 bool runtime_invisible_annotations_exists = false;
3465 const u1* runtime_visible_type_annotations = nullptr;
3466 int runtime_visible_type_annotations_length = 0;
3467 const u1* runtime_invisible_type_annotations = nullptr;
3468 int runtime_invisible_type_annotations_length = 0;
3469 bool runtime_invisible_type_annotations_exists = false;
3470
3471 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3472 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3473 for (int y = 0; y < attributes_count; y++) {
3474 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3475 const u2 attribute_name_index = cfs->get_u2_fast();
3476 const u4 attribute_length = cfs->get_u4_fast();
3477 calculate_attr_size += 6;
3478 check_property(
3479 valid_symbol_at(attribute_name_index),
3480 "Invalid Record attribute name index %u in class file %s",
3481 attribute_name_index, CHECK_0);
3482
3483 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3484 if (attribute_name == vmSymbols::tag_signature()) {
3485 if (generic_sig_index != 0) {
3486 classfile_parse_error(
3487 "Multiple Signature attributes for Record component in class file %s",
3488 THREAD);
3489 return 0;
3490 }
3491 if (attribute_length != 2) {
3492 classfile_parse_error(
3493 "Invalid Signature attribute length %u in Record component in class file %s",
3494 attribute_length, THREAD);
3495 return 0;
3496 }
3497 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3498
3499 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3500 if (runtime_visible_annotations != nullptr) {
3501 classfile_parse_error(
3502 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3503 return 0;
3504 }
3505 runtime_visible_annotations_length = attribute_length;
3506 runtime_visible_annotations = cfs->current();
3507
3508 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3509 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3510 cfs->skip_u1_fast(runtime_visible_annotations_length);
3511
3512 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3513 if (runtime_invisible_annotations_exists) {
3514 classfile_parse_error(
3515 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3516 return 0;
3517 }
3518 runtime_invisible_annotations_exists = true;
3519 if (PreserveAllAnnotations) {
3520 runtime_invisible_annotations_length = attribute_length;
3521 runtime_invisible_annotations = cfs->current();
3522 assert(runtime_invisible_annotations != nullptr, "null record component invisible annotation");
3523 }
3524 cfs->skip_u1(attribute_length, CHECK_0);
3525
3526 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3527 if (runtime_visible_type_annotations != nullptr) {
3528 classfile_parse_error(
3529 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3530 return 0;
3531 }
3532 runtime_visible_type_annotations_length = attribute_length;
3533 runtime_visible_type_annotations = cfs->current();
3534
3535 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3536 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3537 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3538
3539 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3540 if (runtime_invisible_type_annotations_exists) {
3541 classfile_parse_error(
3542 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3543 return 0;
3544 }
3545 runtime_invisible_type_annotations_exists = true;
3546 if (PreserveAllAnnotations) {
3547 runtime_invisible_type_annotations_length = attribute_length;
3548 runtime_invisible_type_annotations = cfs->current();
3549 assert(runtime_invisible_type_annotations != nullptr, "null record component invisible type annotation");
3550 }
3551 cfs->skip_u1(attribute_length, CHECK_0);
3552
3553 } else {
3554 // Skip unknown attributes
3555 cfs->skip_u1(attribute_length, CHECK_0);
3556 }
3557 calculate_attr_size += attribute_length;
3558 } // End of attributes For loop
3559
3560 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3561 runtime_visible_annotations_length,
3562 runtime_invisible_annotations,
3563 runtime_invisible_annotations_length,
3564 CHECK_0);
3565 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3566 runtime_visible_type_annotations_length,
3567 runtime_invisible_type_annotations,
3568 runtime_invisible_type_annotations_length,
3569 CHECK_0);
3570
3571 RecordComponent* record_component =
3572 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3573 attributes_count, generic_sig_index,
3574 annotations, type_annotations, CHECK_0);
3575 record_components->at_put(x, record_component);
3576 } // End of component processing loop
3577
3578 // Restore buffer's current position.
3579 cfs->set_current(current_mark);
3580 return calculate_attr_size;
3581 }
3582
3583 void ClassFileParser::parse_classfile_synthetic_attribute() {
3584 set_class_synthetic_flag(true);
3585 }
3586
3587 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3588 assert(cfs != nullptr, "invariant");
3589
3590 const u2 signature_index = cfs->get_u2(CHECK);
3591 check_property(
3592 valid_symbol_at(signature_index),
3593 "Invalid constant pool index %u in Signature attribute in class file %s",
3594 signature_index, CHECK);
3595 set_class_generic_signature_index(signature_index);
3596 }
3597
3598 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3599 ConstantPool* cp,
3600 u4 attribute_byte_length,
3601 TRAPS) {
3602 assert(cfs != nullptr, "invariant");
3603 assert(cp != nullptr, "invariant");
3604
3605 const u1* const current_start = cfs->current();
3606
3607 guarantee_property(attribute_byte_length >= sizeof(u2),
3608 "Invalid BootstrapMethods attribute length %u in class file %s",
3609 attribute_byte_length,
3610 CHECK);
3611
3612 cfs->guarantee_more(attribute_byte_length, CHECK);
3613
3614 const int attribute_array_length = cfs->get_u2_fast();
3615
3616 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3617 "Short length on BootstrapMethods in class file %s",
3618 CHECK);
3619
3620
3621 // The attribute contains a counted array of counted tuples of shorts,
3622 // represending bootstrap specifiers:
3623 // length*{bootstrap_method_index, argument_count*{argument_index}}
3624 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3625 // operand_count = number of shorts in attr, except for leading length
3626
3627 // The attribute is copied into a short[] array.
3628 // The array begins with a series of short[2] pairs, one for each tuple.
3629 const int index_size = (attribute_array_length * 2);
3630
3631 Array<u2>* const operands =
3632 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3633
3634 // Eagerly assign operands so they will be deallocated with the constant
3635 // pool if there is an error.
3636 cp->set_operands(operands);
3637
3638 int operand_fill_index = index_size;
3639 const int cp_size = cp->length();
3640
3641 for (int n = 0; n < attribute_array_length; n++) {
3642 // Store a 32-bit offset into the header of the operand array.
3643 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3644
3645 // Read a bootstrap specifier.
3646 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3647 const u2 bootstrap_method_index = cfs->get_u2_fast();
3648 const u2 argument_count = cfs->get_u2_fast();
3649 check_property(
3650 valid_cp_range(bootstrap_method_index, cp_size) &&
3651 cp->tag_at(bootstrap_method_index).is_method_handle(),
3652 "bootstrap_method_index %u has bad constant type in class file %s",
3653 bootstrap_method_index,
3654 CHECK);
3655
3656 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3657 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3658 CHECK);
3659
3660 operands->at_put(operand_fill_index++, bootstrap_method_index);
3661 operands->at_put(operand_fill_index++, argument_count);
3662
3663 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3664 for (int j = 0; j < argument_count; j++) {
3665 const u2 argument_index = cfs->get_u2_fast();
3666 check_property(
3667 valid_cp_range(argument_index, cp_size) &&
3668 cp->tag_at(argument_index).is_loadable_constant(),
3669 "argument_index %u has bad constant type in class file %s",
3670 argument_index,
3671 CHECK);
3672 operands->at_put(operand_fill_index++, argument_index);
3673 }
3674 }
3675 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3676 "Bad length on BootstrapMethods in class file %s",
3677 CHECK);
3678 }
3679
3680 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3681 ConstantPool* cp,
3682 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3683 TRAPS) {
3684 assert(cfs != nullptr, "invariant");
3685 assert(cp != nullptr, "invariant");
3686 assert(parsed_annotations != nullptr, "invariant");
3687
3688 // Set inner classes attribute to default sentinel
3689 _inner_classes = Universe::the_empty_short_array();
3690 // Set nest members attribute to default sentinel
3691 _nest_members = Universe::the_empty_short_array();
3692 // Set _permitted_subclasses attribute to default sentinel
3693 _permitted_subclasses = Universe::the_empty_short_array();
3694 // Set _loadable_descriptors attribute to default sentinel
3695 _loadable_descriptors = Universe::the_empty_short_array();
3696 cfs->guarantee_more(2, CHECK); // attributes_count
3697 u2 attributes_count = cfs->get_u2_fast();
3698 bool parsed_sourcefile_attribute = false;
3699 bool parsed_innerclasses_attribute = false;
3700 bool parsed_nest_members_attribute = false;
3701 bool parsed_permitted_subclasses_attribute = false;
3702 bool parsed_loadable_descriptors_attribute = false;
3703 bool parsed_nest_host_attribute = false;
3704 bool parsed_record_attribute = false;
3705 bool parsed_enclosingmethod_attribute = false;
3706 bool parsed_bootstrap_methods_attribute = false;
3707 const u1* runtime_visible_annotations = nullptr;
3708 int runtime_visible_annotations_length = 0;
3709 const u1* runtime_invisible_annotations = nullptr;
3710 int runtime_invisible_annotations_length = 0;
3711 const u1* runtime_visible_type_annotations = nullptr;
3712 int runtime_visible_type_annotations_length = 0;
3713 const u1* runtime_invisible_type_annotations = nullptr;
3714 int runtime_invisible_type_annotations_length = 0;
3715 bool runtime_invisible_type_annotations_exists = false;
3716 bool runtime_invisible_annotations_exists = false;
3717 bool parsed_source_debug_ext_annotations_exist = false;
3718 const u1* inner_classes_attribute_start = nullptr;
3719 u4 inner_classes_attribute_length = 0;
3720 u2 enclosing_method_class_index = 0;
3721 u2 enclosing_method_method_index = 0;
3722 const u1* nest_members_attribute_start = nullptr;
3723 u4 nest_members_attribute_length = 0;
3724 const u1* record_attribute_start = nullptr;
3725 u4 record_attribute_length = 0;
3726 const u1* permitted_subclasses_attribute_start = nullptr;
3727 u4 permitted_subclasses_attribute_length = 0;
3728 const u1* loadable_descriptors_attribute_start = nullptr;
3729 u4 loadable_descriptors_attribute_length = 0;
3730
3731 // Iterate over attributes
3732 while (attributes_count--) {
3733 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3734 const u2 attribute_name_index = cfs->get_u2_fast();
3735 const u4 attribute_length = cfs->get_u4_fast();
3736 check_property(
3737 valid_symbol_at(attribute_name_index),
3738 "Attribute name has bad constant pool index %u in class file %s",
3739 attribute_name_index, CHECK);
3740 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3741 if (tag == vmSymbols::tag_source_file()) {
3742 // Check for SourceFile tag
3743 if (_need_verify) {
3744 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3745 }
3746 if (parsed_sourcefile_attribute) {
3747 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3748 return;
3749 } else {
3750 parsed_sourcefile_attribute = true;
3751 }
3752 parse_classfile_sourcefile_attribute(cfs, CHECK);
3753 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3754 // Check for SourceDebugExtension tag
3755 if (parsed_source_debug_ext_annotations_exist) {
3756 classfile_parse_error(
3757 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3758 return;
3759 }
3760 parsed_source_debug_ext_annotations_exist = true;
3761 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3762 } else if (tag == vmSymbols::tag_inner_classes()) {
3763 // Check for InnerClasses tag
3764 if (parsed_innerclasses_attribute) {
3765 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3766 return;
3767 } else {
3768 parsed_innerclasses_attribute = true;
3769 }
3770 inner_classes_attribute_start = cfs->current();
3771 inner_classes_attribute_length = attribute_length;
3772 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3773 } else if (tag == vmSymbols::tag_synthetic()) {
3774 // Check for Synthetic tag
3775 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3776 if (attribute_length != 0) {
3777 classfile_parse_error(
3778 "Invalid Synthetic classfile attribute length %u in class file %s",
3779 attribute_length, THREAD);
3780 return;
3781 }
3782 parse_classfile_synthetic_attribute();
3783 } else if (tag == vmSymbols::tag_deprecated()) {
3784 // Check for Deprecated tag - 4276120
3785 if (attribute_length != 0) {
3786 classfile_parse_error(
3787 "Invalid Deprecated classfile attribute length %u in class file %s",
3788 attribute_length, THREAD);
3789 return;
3790 }
3791 } else if (_major_version >= JAVA_1_5_VERSION) {
3792 if (tag == vmSymbols::tag_signature()) {
3793 if (_generic_signature_index != 0) {
3794 classfile_parse_error(
3795 "Multiple Signature attributes in class file %s", THREAD);
3796 return;
3797 }
3798 if (attribute_length != 2) {
3799 classfile_parse_error(
3800 "Wrong Signature attribute length %u in class file %s",
3801 attribute_length, THREAD);
3802 return;
3803 }
3804 parse_classfile_signature_attribute(cfs, CHECK);
3805 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3806 if (runtime_visible_annotations != nullptr) {
3807 classfile_parse_error(
3808 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3809 return;
3810 }
3811 runtime_visible_annotations_length = attribute_length;
3812 runtime_visible_annotations = cfs->current();
3813 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3814 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3815 parse_annotations(cp,
3816 runtime_visible_annotations,
3817 runtime_visible_annotations_length,
3818 parsed_annotations,
3819 _loader_data,
3820 _can_access_vm_annotations);
3821 cfs->skip_u1_fast(runtime_visible_annotations_length);
3822 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3823 if (runtime_invisible_annotations_exists) {
3824 classfile_parse_error(
3825 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3826 return;
3827 }
3828 runtime_invisible_annotations_exists = true;
3829 if (PreserveAllAnnotations) {
3830 runtime_invisible_annotations_length = attribute_length;
3831 runtime_invisible_annotations = cfs->current();
3832 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
3833 }
3834 cfs->skip_u1(attribute_length, CHECK);
3835 } else if (tag == vmSymbols::tag_enclosing_method()) {
3836 if (parsed_enclosingmethod_attribute) {
3837 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3838 return;
3839 } else {
3840 parsed_enclosingmethod_attribute = true;
3841 }
3842 guarantee_property(attribute_length == 4,
3843 "Wrong EnclosingMethod attribute length %u in class file %s",
3844 attribute_length, CHECK);
3845 cfs->guarantee_more(4, CHECK); // class_index, method_index
3846 enclosing_method_class_index = cfs->get_u2_fast();
3847 enclosing_method_method_index = cfs->get_u2_fast();
3848 if (enclosing_method_class_index == 0) {
3849 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3850 return;
3851 }
3852 // Validate the constant pool indices and types
3853 check_property(valid_klass_reference_at(enclosing_method_class_index),
3854 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3855 if (enclosing_method_method_index != 0 &&
3856 (!cp->is_within_bounds(enclosing_method_method_index) ||
3857 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3858 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3859 return;
3860 }
3861 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3862 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3863 if (parsed_bootstrap_methods_attribute) {
3864 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3865 return;
3866 }
3867 parsed_bootstrap_methods_attribute = true;
3868 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3869 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3870 if (runtime_visible_type_annotations != nullptr) {
3871 classfile_parse_error(
3872 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3873 return;
3874 }
3875 runtime_visible_type_annotations_length = attribute_length;
3876 runtime_visible_type_annotations = cfs->current();
3877 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3878 // No need for the VM to parse Type annotations
3879 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3880 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3881 if (runtime_invisible_type_annotations_exists) {
3882 classfile_parse_error(
3883 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3884 return;
3885 } else {
3886 runtime_invisible_type_annotations_exists = true;
3887 }
3888 if (PreserveAllAnnotations) {
3889 runtime_invisible_type_annotations_length = attribute_length;
3890 runtime_invisible_type_annotations = cfs->current();
3891 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
3892 }
3893 cfs->skip_u1(attribute_length, CHECK);
3894 } else if (_major_version >= JAVA_11_VERSION) {
3895 if (tag == vmSymbols::tag_nest_members()) {
3896 // Check for NestMembers tag
3897 if (parsed_nest_members_attribute) {
3898 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3899 return;
3900 } else {
3901 parsed_nest_members_attribute = true;
3902 }
3903 if (parsed_nest_host_attribute) {
3904 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3905 return;
3906 }
3907 nest_members_attribute_start = cfs->current();
3908 nest_members_attribute_length = attribute_length;
3909 cfs->skip_u1(nest_members_attribute_length, CHECK);
3910 } else if (tag == vmSymbols::tag_nest_host()) {
3911 if (parsed_nest_host_attribute) {
3912 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3913 return;
3914 } else {
3915 parsed_nest_host_attribute = true;
3916 }
3917 if (parsed_nest_members_attribute) {
3918 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3919 return;
3920 }
3921 if (_need_verify) {
3922 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3923 }
3924 cfs->guarantee_more(2, CHECK);
3925 u2 class_info_index = cfs->get_u2_fast();
3926 check_property(
3927 valid_klass_reference_at(class_info_index),
3928 "Nest-host class_info_index %u has bad constant type in class file %s",
3929 class_info_index, CHECK);
3930 _nest_host = class_info_index;
3931
3932 } else if (_major_version >= JAVA_16_VERSION) {
3933 if (tag == vmSymbols::tag_record()) {
3934 if (parsed_record_attribute) {
3935 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3936 return;
3937 }
3938 parsed_record_attribute = true;
3939 record_attribute_start = cfs->current();
3940 record_attribute_length = attribute_length;
3941 } else if (_major_version >= JAVA_17_VERSION) {
3942 if (tag == vmSymbols::tag_permitted_subclasses()) {
3943 if (parsed_permitted_subclasses_attribute) {
3944 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3945 return;
3946 }
3947 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3948 if (_access_flags.is_final()) {
3949 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3950 return;
3951 }
3952 parsed_permitted_subclasses_attribute = true;
3953 permitted_subclasses_attribute_start = cfs->current();
3954 permitted_subclasses_attribute_length = attribute_length;
3955 }
3956 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3957 if (parsed_loadable_descriptors_attribute) {
3958 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3959 return;
3960 }
3961 parsed_loadable_descriptors_attribute = true;
3962 loadable_descriptors_attribute_start = cfs->current();
3963 loadable_descriptors_attribute_length = attribute_length;
3964 }
3965 }
3966 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3967 cfs->skip_u1(attribute_length, CHECK);
3968 } else {
3969 // Unknown attribute
3970 cfs->skip_u1(attribute_length, CHECK);
3971 }
3972 } else {
3973 // Unknown attribute
3974 cfs->skip_u1(attribute_length, CHECK);
3975 }
3976 } else {
3977 // Unknown attribute
3978 cfs->skip_u1(attribute_length, CHECK);
3979 }
3980 }
3981 _class_annotations = assemble_annotations(runtime_visible_annotations,
3982 runtime_visible_annotations_length,
3983 runtime_invisible_annotations,
3984 runtime_invisible_annotations_length,
3985 CHECK);
3986 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3987 runtime_visible_type_annotations_length,
3988 runtime_invisible_type_annotations,
3989 runtime_invisible_type_annotations_length,
3990 CHECK);
3991
3992 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3993 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3994 cfs,
3995 cp,
3996 inner_classes_attribute_start,
3997 parsed_innerclasses_attribute,
3998 enclosing_method_class_index,
3999 enclosing_method_method_index,
4000 CHECK);
4001 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
4002 guarantee_property(
4003 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
4004 "Wrong InnerClasses attribute length in class file %s", CHECK);
4005 }
4006 }
4007
4008 if (parsed_nest_members_attribute) {
4009 const u2 num_of_classes = parse_classfile_nest_members_attribute(
4010 cfs,
4011 nest_members_attribute_start,
4012 CHECK);
4013 if (_need_verify) {
4014 guarantee_property(
4015 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
4016 "Wrong NestMembers attribute length in class file %s", CHECK);
4017 }
4018 }
4019
4020 if (parsed_record_attribute) {
4021 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
4022 cfs,
4023 cp,
4024 record_attribute_start,
4025 CHECK);
4026 if (_need_verify) {
4027 guarantee_property(record_attribute_length == calculated_attr_length,
4028 "Record attribute has wrong length in class file %s",
4029 CHECK);
4030 }
4031 }
4032
4033 if (parsed_permitted_subclasses_attribute) {
4034 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
4035 cfs,
4036 permitted_subclasses_attribute_start,
4037 CHECK);
4038 if (_need_verify) {
4039 guarantee_property(
4040 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
4041 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
4042 }
4043 }
4044
4045 if (parsed_loadable_descriptors_attribute) {
4046 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
4047 cfs,
4048 loadable_descriptors_attribute_start,
4049 CHECK);
4050 if (_need_verify) {
4051 guarantee_property(
4052 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
4053 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
4054 }
4055 }
4056
4057 if (_max_bootstrap_specifier_index >= 0) {
4058 guarantee_property(parsed_bootstrap_methods_attribute,
4059 "Missing BootstrapMethods attribute in class file %s", CHECK);
4060 }
4061 }
4062
4063 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
4064 assert(k != nullptr, "invariant");
4065
4066 if (_synthetic_flag)
4067 k->set_is_synthetic();
4068 if (_sourcefile_index != 0) {
4069 k->set_source_file_name_index(_sourcefile_index);
4070 }
4071 if (_generic_signature_index != 0) {
4072 k->set_generic_signature_index(_generic_signature_index);
4073 }
4074 if (_sde_buffer != nullptr) {
4075 k->set_source_debug_extension(_sde_buffer, _sde_length);
4076 }
4077 }
4078
4079 // Create the Annotations object that will
4080 // hold the annotations array for the Klass.
4081 void ClassFileParser::create_combined_annotations(TRAPS) {
4082 if (_class_annotations == nullptr &&
4083 _class_type_annotations == nullptr &&
4084 _fields_annotations == nullptr &&
4085 _fields_type_annotations == nullptr) {
4086 // Don't create the Annotations object unnecessarily.
4087 return;
4088 }
4089
4090 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
4091 annotations->set_class_annotations(_class_annotations);
4092 annotations->set_class_type_annotations(_class_type_annotations);
4093 annotations->set_fields_annotations(_fields_annotations);
4094 annotations->set_fields_type_annotations(_fields_type_annotations);
4095
4096 // This is the Annotations object that will be
4097 // assigned to InstanceKlass being constructed.
4098 _combined_annotations = annotations;
4099
4100 // The annotations arrays below has been transferred the
4101 // _combined_annotations so these fields can now be cleared.
4102 _class_annotations = nullptr;
4103 _class_type_annotations = nullptr;
4104 _fields_annotations = nullptr;
4105 _fields_type_annotations = nullptr;
4106 }
4107
4108 // Transfer ownership of metadata allocated to the InstanceKlass.
4109 void ClassFileParser::apply_parsed_class_metadata(
4110 InstanceKlass* this_klass,
4111 int java_fields_count) {
4112 assert(this_klass != nullptr, "invariant");
4113
4114 _cp->set_pool_holder(this_klass);
4115 this_klass->set_constants(_cp);
4116 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
4117 this_klass->set_fields_status(_fields_status);
4118 this_klass->set_methods(_methods);
4119 this_klass->set_inner_classes(_inner_classes);
4120 this_klass->set_nest_members(_nest_members);
4121 this_klass->set_nest_host_index(_nest_host);
4122 this_klass->set_loadable_descriptors(_loadable_descriptors);
4123 this_klass->set_annotations(_combined_annotations);
4124 this_klass->set_permitted_subclasses(_permitted_subclasses);
4125 this_klass->set_record_components(_record_components);
4126 this_klass->set_inline_type_field_klasses_array(_inline_type_field_klasses);
4127 this_klass->set_null_marker_offsets_array(_null_marker_offsets);
4128 // Delay the setting of _local_interfaces and _transitive_interfaces until after
4129 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
4130 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
4131 // its _super. If an OOM occurs while loading the current klass, its _super field
4132 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
4133 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
4134 // dereferences to the deallocated _transitive_interfaces will result in a crash.
4135
4136 // Clear out these fields so they don't get deallocated by the destructor
4137 clear_class_metadata();
4138 }
4139
4140 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
4141 int runtime_visible_annotations_length,
4142 const u1* const runtime_invisible_annotations,
4143 int runtime_invisible_annotations_length,
4144 TRAPS) {
4145 AnnotationArray* annotations = nullptr;
4146 if (runtime_visible_annotations != nullptr ||
4147 runtime_invisible_annotations != nullptr) {
4148 annotations = MetadataFactory::new_array<u1>(_loader_data,
4149 runtime_visible_annotations_length +
4150 runtime_invisible_annotations_length,
4151 CHECK_(annotations));
4152 if (runtime_visible_annotations != nullptr) {
4153 for (int i = 0; i < runtime_visible_annotations_length; i++) {
4154 annotations->at_put(i, runtime_visible_annotations[i]);
4155 }
4156 }
4157 if (runtime_invisible_annotations != nullptr) {
4158 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4159 int append = runtime_visible_annotations_length+i;
4160 annotations->at_put(append, runtime_invisible_annotations[i]);
4161 }
4162 }
4163 }
4164 return annotations;
4165 }
4166
4167 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4168 const int super_class_index,
4169 const bool need_verify,
4170 TRAPS) {
4171 assert(cp != nullptr, "invariant");
4172 const InstanceKlass* super_klass = nullptr;
4173
4174 if (super_class_index == 0) {
4175 check_property(_class_name == vmSymbols::java_lang_Object(),
4176 "Invalid superclass index 0 in class file %s",
4177 CHECK_NULL);
4178 } else {
4179 check_property(valid_klass_reference_at(super_class_index),
4180 "Invalid superclass index %u in class file %s",
4181 super_class_index,
4182 CHECK_NULL);
4183 // The class name should be legal because it is checked when parsing constant pool.
4184 // However, make sure it is not an array type.
4185 if (cp->tag_at(super_class_index).is_klass()) {
4186 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4187 }
4188 if (need_verify) {
4189 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4190 guarantee_property(!is_array,
4191 "Bad superclass name in class file %s", CHECK_NULL);
4192 }
4193 }
4194 return super_klass;
4195 }
4196
4197 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4198 _max_nonstatic_oop_maps = max_blocks;
4199 _nonstatic_oop_map_count = 0;
4200 if (max_blocks == 0) {
4201 _nonstatic_oop_maps = nullptr;
4202 } else {
4203 _nonstatic_oop_maps =
4204 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4205 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4206 }
4207 }
4208
4209 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4210 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4211 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4212 }
4213
4214 // addition of super oop maps
4215 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4216 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4217 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4218
4219 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4220 _nonstatic_oop_map_count += nof_blocks;
4221 }
4222
4223 // collection of oops
4224 void OopMapBlocksBuilder::add(int offset, int count) {
4225 if (_nonstatic_oop_map_count == 0) {
4226 _nonstatic_oop_map_count++;
4227 }
4228 OopMapBlock* nonstatic_oop_map = last_oop_map();
4229 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4230 nonstatic_oop_map->set_offset(offset);
4231 nonstatic_oop_map->set_count(count);
4232 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4233 nonstatic_oop_map->increment_count(count);
4234 } else { // Need a new one...
4235 _nonstatic_oop_map_count++;
4236 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4237 nonstatic_oop_map = last_oop_map();
4238 nonstatic_oop_map->set_offset(offset);
4239 nonstatic_oop_map->set_count(count);
4240 }
4241 }
4242
4243 // general purpose copy, e.g. into allocated instanceKlass
4244 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4245 if (_nonstatic_oop_map_count != 0) {
4246 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4247 }
4248 }
4249
4250 // Sort and compact adjacent blocks
4251 void OopMapBlocksBuilder::compact() {
4252 if (_nonstatic_oop_map_count <= 1) {
4253 return;
4254 }
4255 /*
4256 * Since field layout sneaks in oops before values, we will be able to condense
4257 * blocks. There is potential to compact between super, own refs and values
4258 * containing refs.
4259 *
4260 * Currently compaction is slightly limited due to values being 8 byte aligned.
4261 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4262 * and maybe it doesn't need to be.
4263 */
4264 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4265 (_sort_Fn)OopMapBlock::compare_offset);
4266 if (_nonstatic_oop_map_count < 2) {
4267 return;
4268 }
4269
4270 // Make a temp copy, and iterate through and copy back into the original
4271 ResourceMark rm;
4272 OopMapBlock* oop_maps_copy =
4273 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4274 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4275 copy(oop_maps_copy);
4276 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4277 unsigned int new_count = 1;
4278 oop_maps_copy++;
4279 while(oop_maps_copy < oop_maps_copy_end) {
4280 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4281 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4282 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4283 } else {
4284 nonstatic_oop_map++;
4285 new_count++;
4286 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4287 nonstatic_oop_map->set_count(oop_maps_copy->count());
4288 }
4289 oop_maps_copy++;
4290 }
4291 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4292 _nonstatic_oop_map_count = new_count;
4293 }
4294
4295 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4296 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4297 if (_nonstatic_oop_map_count > 0) {
4298 OopMapBlock* map = _nonstatic_oop_maps;
4299 OopMapBlock* last_map = last_oop_map();
4300 assert(map <= last_map, "Last less than first");
4301 while (map <= last_map) {
4302 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4303 map->offset() + map->offset_span() - heapOopSize, map->count());
4304 map++;
4305 }
4306 }
4307 }
4308
4309 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4310 print_on(st);
4311 }
4312
4313 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4314 assert(ik != nullptr, "invariant");
4315
4316 const InstanceKlass* const super = ik->java_super();
4317
4318 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4319 // in which case we don't have to register objects as finalizable
4320 if (!_has_empty_finalizer) {
4321 if (_has_finalizer ||
4322 (super != nullptr && super->has_finalizer())) {
4323 ik->set_has_finalizer();
4324 }
4325 }
4326
4327 #ifdef ASSERT
4328 bool f = false;
4329 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4330 vmSymbols::void_method_signature());
4331 if (InstanceKlass::is_finalization_enabled() &&
4332 (m != nullptr) && !m->is_empty_method()) {
4333 f = true;
4334 }
4335
4336 // Spec doesn't prevent agent from redefinition of empty finalizer.
4337 // Despite the fact that it's generally bad idea and redefined finalizer
4338 // will not work as expected we shouldn't abort vm in this case
4339 if (!ik->has_redefined_this_or_super()) {
4340 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4341 }
4342 #endif
4343
4344 // Check if this klass supports the java.lang.Cloneable interface
4345 if (vmClasses::Cloneable_klass_loaded()) {
4346 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4347 ik->set_is_cloneable();
4348 }
4349 }
4350
4351 // Check if this klass has a vanilla default constructor
4352 if (super == nullptr) {
4353 // java.lang.Object has empty default constructor
4354 ik->set_has_vanilla_constructor();
4355 } else {
4356 if (super->has_vanilla_constructor() &&
4357 _has_vanilla_constructor) {
4358 ik->set_has_vanilla_constructor();
4359 }
4360 #ifdef ASSERT
4361 bool v = false;
4362 if (super->has_vanilla_constructor()) {
4363 const Method* const constructor =
4364 ik->find_method(vmSymbols::object_initializer_name(),
4365 vmSymbols::void_method_signature());
4366 if (constructor != nullptr && constructor->is_vanilla_constructor()) {
4367 v = true;
4368 }
4369 }
4370 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4371 #endif
4372 }
4373
4374 // If it cannot be fast-path allocated, set a bit in the layout helper.
4375 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4376 assert(ik->size_helper() > 0, "layout_helper is initialized");
4377 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4378 || ik->is_abstract() || ik->is_interface()
4379 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4380 || ik->size_helper() >= FastAllocateSizeLimit) {
4381 // Forbid fast-path allocation.
4382 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4383 ik->set_layout_helper(lh);
4384 }
4385 }
4386
4387 bool ClassFileParser::supports_inline_types() const {
4388 // Inline types are only supported by class file version 67.65535 and later
4389 return _major_version > JAVA_23_VERSION ||
4390 (_major_version == JAVA_23_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4391 }
4392
4393 // utility methods for appending an array with check for duplicates
4394
4395 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4396 const Array<InstanceKlass*>* const ifs) {
4397 // iterate over new interfaces
4398 for (int i = 0; i < ifs->length(); i++) {
4399 InstanceKlass* const e = ifs->at(i);
4400 assert(e->is_klass() && e->is_interface(), "just checking");
4401 // add new interface
4402 result->append_if_missing(e);
4403 }
4404 }
4405
4406 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4407 Array<InstanceKlass*>* local_ifs,
4408 ClassLoaderData* loader_data,
4409 TRAPS) {
4410 assert(local_ifs != nullptr, "invariant");
4411 assert(loader_data != nullptr, "invariant");
4412
4413 // Compute maximum size for transitive interfaces
4414 int max_transitive_size = 0;
4415 int super_size = 0;
4416 // Add superclass transitive interfaces size
4417 if (super != nullptr) {
4418 super_size = super->transitive_interfaces()->length();
4419 max_transitive_size += super_size;
4420 }
4421 // Add local interfaces' super interfaces
4422 const int local_size = local_ifs->length();
4423 for (int i = 0; i < local_size; i++) {
4424 InstanceKlass* const l = local_ifs->at(i);
4425 max_transitive_size += l->transitive_interfaces()->length();
4426 }
4427 // Finally add local interfaces
4428 max_transitive_size += local_size;
4429 // Construct array
4430 if (max_transitive_size == 0) {
4431 // no interfaces, use canonicalized array
4432 return Universe::the_empty_instance_klass_array();
4433 } else if (max_transitive_size == super_size) {
4434 // no new local interfaces added, share superklass' transitive interface array
4435 return super->transitive_interfaces();
4436 // The three lines below are commented to work around bug JDK-8245487
4437 // } else if (max_transitive_size == local_size) {
4438 // // only local interfaces added, share local interface array
4439 // return local_ifs;
4440 } else {
4441 ResourceMark rm;
4442 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4443
4444 // Copy down from superclass
4445 if (super != nullptr) {
4446 append_interfaces(result, super->transitive_interfaces());
4447 }
4448
4449 // Copy down from local interfaces' superinterfaces
4450 for (int i = 0; i < local_size; i++) {
4451 InstanceKlass* const l = local_ifs->at(i);
4452 append_interfaces(result, l->transitive_interfaces());
4453 }
4454 // Finally add local interfaces
4455 append_interfaces(result, local_ifs);
4456
4457 // length will be less than the max_transitive_size if duplicates were removed
4458 const int length = result->length();
4459 assert(length <= max_transitive_size, "just checking");
4460
4461 Array<InstanceKlass*>* const new_result =
4462 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4463 for (int i = 0; i < length; i++) {
4464 InstanceKlass* const e = result->at(i);
4465 assert(e != nullptr, "just checking");
4466 new_result->at_put(i, e);
4467 }
4468 return new_result;
4469 }
4470 }
4471
4472 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4473 assert(this_klass != nullptr, "invariant");
4474 const Klass* const super = this_klass->super();
4475
4476 if (super != nullptr) {
4477 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4478
4479 if (super->is_final()) {
4480 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4481 return;
4482 }
4483
4484 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4485 classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4486 return;
4487 }
4488
4489 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4490 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4491 // for a value classes. So, it is treated as a special case for now.
4492 if (!this_klass->access_flags().is_identity_class() &&
4493 super_ik->name() != vmSymbols::java_lang_Object() &&
4494 super_ik->is_identity_class()) {
4495 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4496 return;
4497 }
4498
4499 // If the loader is not the boot loader then throw an exception if its
4500 // superclass is in package jdk.internal.reflect and its loader is not a
4501 // special reflection class loader
4502 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4503 PackageEntry* super_package = super->package();
4504 if (super_package != nullptr &&
4505 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4506 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4507 ResourceMark rm(THREAD);
4508 Exceptions::fthrow(
4509 THREAD_AND_LOCATION,
4510 vmSymbols::java_lang_IllegalAccessError(),
4511 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4512 this_klass->external_name(),
4513 this_klass->class_loader_data()->loader_name_and_id(),
4514 super->external_name());
4515 return;
4516 }
4517 }
4518
4519 Reflection::VerifyClassAccessResults vca_result =
4520 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4521 if (vca_result != Reflection::ACCESS_OK) {
4522 ResourceMark rm(THREAD);
4523 char* msg = Reflection::verify_class_access_msg(this_klass,
4524 InstanceKlass::cast(super),
4525 vca_result);
4526 if (msg == nullptr) {
4527 bool same_module = (this_klass->module() == super->module());
4528 Exceptions::fthrow(
4529 THREAD_AND_LOCATION,
4530 vmSymbols::java_lang_IllegalAccessError(),
4531 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4532 this_klass->external_name(),
4533 super->is_abstract() ? "abstract " : "",
4534 super->external_name(),
4535 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4536 (same_module) ? "" : "; ",
4537 (same_module) ? "" : super->class_in_module_of_loader());
4538 } else {
4539 // Add additional message content.
4540 Exceptions::fthrow(
4541 THREAD_AND_LOCATION,
4542 vmSymbols::java_lang_IllegalAccessError(),
4543 "superclass access check failed: %s",
4544 msg);
4545 }
4546 }
4547 }
4548 }
4549
4550
4551 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4552 assert(this_klass != nullptr, "invariant");
4553 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4554 const int lng = local_interfaces->length();
4555 for (int i = lng - 1; i >= 0; i--) {
4556 InstanceKlass* const k = local_interfaces->at(i);
4557 assert (k != nullptr && k->is_interface(), "invalid interface");
4558
4559 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4560 classfile_icce_error(this_klass->is_interface() ?
4561 "class %s cannot extend sealed interface %s" :
4562 "class %s cannot implement sealed interface %s",
4563 k, THREAD);
4564 return;
4565 }
4566
4567 Reflection::VerifyClassAccessResults vca_result =
4568 Reflection::verify_class_access(this_klass, k, false);
4569 if (vca_result != Reflection::ACCESS_OK) {
4570 ResourceMark rm(THREAD);
4571 char* msg = Reflection::verify_class_access_msg(this_klass,
4572 k,
4573 vca_result);
4574 if (msg == nullptr) {
4575 bool same_module = (this_klass->module() == k->module());
4576 Exceptions::fthrow(
4577 THREAD_AND_LOCATION,
4578 vmSymbols::java_lang_IllegalAccessError(),
4579 "class %s cannot access its superinterface %s (%s%s%s)",
4580 this_klass->external_name(),
4581 k->external_name(),
4582 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4583 (same_module) ? "" : "; ",
4584 (same_module) ? "" : k->class_in_module_of_loader());
4585 return;
4586 } else {
4587 // Add additional message content.
4588 Exceptions::fthrow(
4589 THREAD_AND_LOCATION,
4590 vmSymbols::java_lang_IllegalAccessError(),
4591 "superinterface check failed: %s",
4592 msg);
4593 return;
4594 }
4595 }
4596 }
4597 }
4598
4599
4600 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4601 assert(this_klass != nullptr, "invariant");
4602 const Array<Method*>* const methods = this_klass->methods();
4603 const int num_methods = methods->length();
4604
4605 // go thru each method and check if it overrides a final method
4606 for (int index = 0; index < num_methods; index++) {
4607 const Method* const m = methods->at(index);
4608
4609 // skip private, static, and <init> methods
4610 if ((!m->is_private() && !m->is_static()) &&
4611 (m->name() != vmSymbols::object_initializer_name())) {
4612
4613 const Symbol* const name = m->name();
4614 const Symbol* const signature = m->signature();
4615 const InstanceKlass* k = this_klass->java_super();
4616 const Method* super_m = nullptr;
4617 while (k != nullptr) {
4618 // skip supers that don't have final methods.
4619 if (k->has_final_method()) {
4620 // lookup a matching method in the super class hierarchy
4621 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4622 if (super_m == nullptr) {
4623 break; // didn't find any match; get out
4624 }
4625
4626 if (super_m->is_final() && !super_m->is_static() &&
4627 !super_m->access_flags().is_private()) {
4628 // matching method in super is final, and not static or private
4629 bool can_access = Reflection::verify_member_access(this_klass,
4630 super_m->method_holder(),
4631 super_m->method_holder(),
4632 super_m->access_flags(),
4633 false, false, CHECK);
4634 if (can_access) {
4635 // this class can access super final method and therefore override
4636 ResourceMark rm(THREAD);
4637 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4638 err_msg("class %s overrides final method %s.%s%s",
4639 this_klass->external_name(),
4640 super_m->method_holder()->external_name(),
4641 name->as_C_string(),
4642 signature->as_C_string()));
4643 }
4644 }
4645
4646 // continue to look from super_m's holder's super.
4647 k = super_m->method_holder()->java_super();
4648 continue;
4649 }
4650
4651 k = k->java_super();
4652 }
4653 }
4654 }
4655 }
4656
4657
4658 // assumes that this_klass is an interface
4659 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4660 assert(this_klass != nullptr, "invariant");
4661 assert(this_klass->is_interface(), "not an interface");
4662 const Array<Method*>* methods = this_klass->methods();
4663 const int num_methods = methods->length();
4664
4665 for (int index = 0; index < num_methods; index++) {
4666 const Method* const m = methods->at(index);
4667 // if m is static and not the init method, throw a verify error
4668 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4669 ResourceMark rm(THREAD);
4670 Exceptions::fthrow(
4671 THREAD_AND_LOCATION,
4672 vmSymbols::java_lang_VerifyError(),
4673 "Illegal static method %s in interface %s",
4674 m->name()->as_C_string(),
4675 this_klass->external_name()
4676 );
4677 return;
4678 }
4679 }
4680 }
4681
4682 // utility methods for format checking
4683
4684 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4685 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4686 const bool is_inner_class = name != nullptr;
4687 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4688 if (is_module) {
4689 ResourceMark rm(THREAD);
4690 Exceptions::fthrow(
4691 THREAD_AND_LOCATION,
4692 vmSymbols::java_lang_NoClassDefFoundError(),
4693 "%s is not a class because access_flag ACC_MODULE is set",
4694 _class_name->as_C_string());
4695 return;
4696 }
4697
4698 if (!_need_verify) { return; }
4699
4700 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4701 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4702 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4703 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4704 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4705 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4706 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4707 const bool valid_value_class = is_identity || is_interface ||
4708 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4709
4710 if ((is_abstract && is_final) ||
4711 (is_interface && !is_abstract) ||
4712 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4713 (!is_interface && major_gte_1_5 && is_annotation) ||
4714 (!valid_value_class)) {
4715 ResourceMark rm(THREAD);
4716 const char* class_note = "";
4717 if (!valid_value_class) {
4718 class_note = " (a value class must be final or else abstract)";
4719 }
4720 if (name == nullptr) { // Not an inner class
4721 Exceptions::fthrow(
4722 THREAD_AND_LOCATION,
4723 vmSymbols::java_lang_ClassFormatError(),
4724 "Illegal class modifiers in class %s%s: 0x%X",
4725 _class_name->as_C_string(), class_note, flags
4726 );
4727 return;
4728 } else {
4729 Exceptions::fthrow(
4730 THREAD_AND_LOCATION,
4731 vmSymbols::java_lang_ClassFormatError(),
4732 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4733 name, class_note, _class_name->as_C_string(), flags
4734 );
4735 return;
4736 }
4737 }
4738 }
4739
4740 static bool has_illegal_visibility(jint flags) {
4741 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4742 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4743 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4744
4745 return ((is_public && is_protected) ||
4746 (is_public && is_private) ||
4747 (is_protected && is_private));
4748 }
4749
4750 // A legal major_version.minor_version must be one of the following:
4751 //
4752 // Major_version >= 45 and major_version < 56, any minor_version.
4753 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4754 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4755 //
4756 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4757 ResourceMark rm(THREAD);
4758 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4759 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4760 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4761 class_name, major, minor, THREAD);
4762 return;
4763 }
4764
4765 if (major > max_version) {
4766 Exceptions::fthrow(
4767 THREAD_AND_LOCATION,
4768 vmSymbols::java_lang_UnsupportedClassVersionError(),
4769 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4770 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4771 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4772 return;
4773 }
4774
4775 if (major < JAVA_12_VERSION || minor == 0) {
4776 return;
4777 }
4778
4779 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4780 if (major != max_version) {
4781 Exceptions::fthrow(
4782 THREAD_AND_LOCATION,
4783 vmSymbols::java_lang_UnsupportedClassVersionError(),
4784 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4785 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4786 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4787 return;
4788 }
4789
4790 if (!Arguments::enable_preview()) {
4791 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4792 class_name, major, minor, THREAD);
4793 return;
4794 }
4795
4796 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4797 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4798 class_name, major, minor, THREAD);
4799 }
4800 }
4801
4802 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4803 AccessFlags class_access_flags,
4804 TRAPS) const {
4805 if (!_need_verify) { return; }
4806
4807 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4808 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4809 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4810 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4811 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4812 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4813 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4814 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4815 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4816 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4817
4818 const bool is_interface = class_access_flags.is_interface();
4819 const bool is_identity_class = class_access_flags.is_identity_class();
4820
4821 bool is_illegal = false;
4822 const char* error_msg = "";
4823
4824 // There is some overlap in the checks that apply, for example interface fields
4825 // must be static, static fields can't be strict, and therefore interfaces can't
4826 // have strict fields. So we don't have to check every possible invalid combination
4827 // individually as long as all are covered. Once we have found an illegal combination
4828 // we can stop checking.
4829
4830 if (supports_inline_types()) {
4831 if (is_strict && is_static) {
4832 is_illegal = true;
4833 error_msg = "field cannot be strict and static";
4834 }
4835 else if (is_strict && !is_final) {
4836 is_illegal = true;
4837 error_msg = "strict field must be final";
4838 }
4839 }
4840
4841 if (!is_illegal) {
4842 if (is_interface) {
4843 if (!is_public || !is_static || !is_final || is_private ||
4844 is_protected || is_volatile || is_transient ||
4845 (major_gte_1_5 && is_enum)) {
4846 is_illegal = true;
4847 error_msg = "interface fields must be public, static and final, and may be synthetic";
4848 }
4849 } else { // not interface
4850 if (has_illegal_visibility(flags)) {
4851 is_illegal = true;
4852 error_msg = "invalid visibility flags for class field";
4853 } else if (is_final && is_volatile) {
4854 is_illegal = true;
4855 error_msg = "fields cannot be final and volatile";
4856 } else if (supports_inline_types()) {
4857 if (!is_identity_class && !is_static && !is_strict) {
4858 is_illegal = true;
4859 error_msg = "value class fields must be either strict or static";
4860 }
4861 }
4862 }
4863 }
4864
4865 if (is_illegal) {
4866 ResourceMark rm(THREAD);
4867 Exceptions::fthrow(
4868 THREAD_AND_LOCATION,
4869 vmSymbols::java_lang_ClassFormatError(),
4870 "Illegal field modifiers (%s) in class %s: 0x%X",
4871 error_msg, _class_name->as_C_string(), flags);
4872 return;
4873 }
4874 }
4875
4876 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4877 AccessFlags class_access_flags,
4878 const Symbol* name,
4879 TRAPS) const {
4880 if (!_need_verify) { return; }
4881
4882 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4883 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4884 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4885 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4886 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4887 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4888 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4889 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4890 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4891 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4892 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4893 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4894 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4895 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4896 // LW401 CR required: removal of value factories support
4897 const bool is_interface = class_access_flags.is_interface();
4898 const bool is_identity_class = class_access_flags.is_identity_class();
4899 const bool is_abstract_class = class_access_flags.is_abstract();
4900
4901 bool is_illegal = false;
4902
4903 const char* class_note = "";
4904 if (is_interface) {
4905 if (major_gte_8) {
4906 // Class file version is JAVA_8_VERSION or later Methods of
4907 // interfaces may set any of the flags except ACC_PROTECTED,
4908 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4909 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4910 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4911 (is_native || is_protected || is_final || is_synchronized) ||
4912 // If a specific method of a class or interface has its
4913 // ACC_ABSTRACT flag set, it must not have any of its
4914 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4915 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4916 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4917 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4918 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4919 is_illegal = true;
4920 }
4921 } else if (major_gte_1_5) {
4922 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4923 if (!is_public || is_private || is_protected || is_static || is_final ||
4924 is_synchronized || is_native || !is_abstract || is_strict) {
4925 is_illegal = true;
4926 }
4927 } else {
4928 // Class file version is pre-JAVA_1_5_VERSION
4929 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4930 is_illegal = true;
4931 }
4932 }
4933 } else { // not interface
4934 if (has_illegal_visibility(flags)) {
4935 is_illegal = true;
4936 } else {
4937 if (is_initializer) {
4938 if (is_static || is_final || is_synchronized || is_native ||
4939 is_abstract || (major_gte_1_5 && is_bridge)) {
4940 is_illegal = true;
4941 }
4942 } else { // not initializer
4943 if (!is_identity_class && is_synchronized && !is_static) {
4944 is_illegal = true;
4945 class_note = " (not an identity class)";
4946 } else {
4947 if (is_abstract) {
4948 if ((is_final || is_native || is_private || is_static ||
4949 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4950 is_illegal = true;
4951 }
4952 }
4953 }
4954 }
4955 }
4956 }
4957
4958 if (is_illegal) {
4959 ResourceMark rm(THREAD);
4960 Exceptions::fthrow(
4961 THREAD_AND_LOCATION,
4962 vmSymbols::java_lang_ClassFormatError(),
4963 "Method %s in class %s%s has illegal modifiers: 0x%X",
4964 name->as_C_string(), _class_name->as_C_string(),
4965 class_note, flags);
4966 return;
4967 }
4968 }
4969
4970 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4971 int length,
4972 TRAPS) const {
4973 assert(_need_verify, "only called when _need_verify is true");
4974 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4975 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4976 }
4977 }
4978
4979 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4980 // In class names, '/' separates unqualified names. This is verified in this function also.
4981 // Method names also may not contain the characters '<' or '>', unless <init>
4982 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4983 // method. Because these names have been checked as special cases before
4984 // calling this method in verify_legal_method_name.
4985 //
4986 // This method is also called from the modular system APIs in modules.cpp
4987 // to verify the validity of module and package names.
4988 bool ClassFileParser::verify_unqualified_name(const char* name,
4989 unsigned int length,
4990 int type) {
4991 if (length == 0) return false; // Must have at least one char.
4992 for (const char* p = name; p != name + length; p++) {
4993 switch(*p) {
4994 case JVM_SIGNATURE_DOT:
4995 case JVM_SIGNATURE_ENDCLASS:
4996 case JVM_SIGNATURE_ARRAY:
4997 // do not permit '.', ';', or '['
4998 return false;
4999 case JVM_SIGNATURE_SLASH:
5000 // check for '//' or leading or trailing '/' which are not legal
5001 // unqualified name must not be empty
5002 if (type == ClassFileParser::LegalClass) {
5003 if (p == name || p+1 >= name+length ||
5004 *(p+1) == JVM_SIGNATURE_SLASH) {
5005 return false;
5006 }
5007 } else {
5008 return false; // do not permit '/' unless it's class name
5009 }
5010 break;
5011 case JVM_SIGNATURE_SPECIAL:
5012 case JVM_SIGNATURE_ENDSPECIAL:
5013 // do not permit '<' or '>' in method names
5014 if (type == ClassFileParser::LegalMethod) {
5015 return false;
5016 }
5017 }
5018 }
5019 return true;
5020 }
5021
5022 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
5023 if (_loadable_descriptors == nullptr) return false;
5024 for (int i = 0; i < _loadable_descriptors->length(); i++) {
5025 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
5026 if (class_name == klass) return true;
5027 }
5028 return false;
5029 }
5030
5031 // Take pointer to a UTF8 byte string (not NUL-terminated).
5032 // Skip over the longest part of the string that could
5033 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
5034 // Return a pointer to just past the fieldname.
5035 // Return null if no fieldname at all was found, or in the case of slash_ok
5036 // being true, we saw consecutive slashes (meaning we were looking for a
5037 // qualified path but found something that was badly-formed).
5038 static const char* skip_over_field_name(const char* const name,
5039 bool slash_ok,
5040 unsigned int length) {
5041 const char* p;
5042 jboolean last_is_slash = false;
5043 jboolean not_first_ch = false;
5044
5045 for (p = name; p != name + length; not_first_ch = true) {
5046 const char* old_p = p;
5047 jchar ch = *p;
5048 if (ch < 128) {
5049 p++;
5050 // quick check for ascii
5051 if ((ch >= 'a' && ch <= 'z') ||
5052 (ch >= 'A' && ch <= 'Z') ||
5053 (ch == '_' || ch == '$') ||
5054 (not_first_ch && ch >= '0' && ch <= '9')) {
5055 last_is_slash = false;
5056 continue;
5057 }
5058 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5059 if (last_is_slash) {
5060 return nullptr; // Don't permit consecutive slashes
5061 }
5062 last_is_slash = true;
5063 continue;
5064 }
5065 }
5066 else {
5067 jint unicode_ch;
5068 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5069 p = tmp_p;
5070 last_is_slash = false;
5071 // Check if ch is Java identifier start or is Java identifier part
5072 // 4672820: call java.lang.Character methods directly without generating separate tables.
5073 EXCEPTION_MARK;
5074 // return value
5075 JavaValue result(T_BOOLEAN);
5076 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5077 JavaCallArguments args;
5078 args.push_int(unicode_ch);
5079
5080 if (not_first_ch) {
5081 // public static boolean isJavaIdentifierPart(char ch);
5082 JavaCalls::call_static(&result,
5083 vmClasses::Character_klass(),
5084 vmSymbols::isJavaIdentifierPart_name(),
5085 vmSymbols::int_bool_signature(),
5086 &args,
5087 THREAD);
5088 } else {
5089 // public static boolean isJavaIdentifierStart(char ch);
5090 JavaCalls::call_static(&result,
5091 vmClasses::Character_klass(),
5092 vmSymbols::isJavaIdentifierStart_name(),
5093 vmSymbols::int_bool_signature(),
5094 &args,
5095 THREAD);
5096 }
5097 if (HAS_PENDING_EXCEPTION) {
5098 CLEAR_PENDING_EXCEPTION;
5099 return nullptr;
5100 }
5101 if(result.get_jboolean()) {
5102 continue;
5103 }
5104 }
5105 return (not_first_ch) ? old_p : nullptr;
5106 }
5107 return (not_first_ch && !last_is_slash) ? p : nullptr;
5108 }
5109
5110 // Take pointer to a UTF8 byte string (not NUL-terminated).
5111 // Skip over the longest part of the string that could
5112 // be taken as a field signature. Allow "void" if void_ok.
5113 // Return a pointer to just past the signature.
5114 // Return null if no legal signature is found.
5115 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5116 bool void_ok,
5117 unsigned int length,
5118 TRAPS) const {
5119 unsigned int array_dim = 0;
5120 while (length > 0) {
5121 switch (signature[0]) {
5122 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
5123 case JVM_SIGNATURE_BOOLEAN:
5124 case JVM_SIGNATURE_BYTE:
5125 case JVM_SIGNATURE_CHAR:
5126 case JVM_SIGNATURE_SHORT:
5127 case JVM_SIGNATURE_INT:
5128 case JVM_SIGNATURE_FLOAT:
5129 case JVM_SIGNATURE_LONG:
5130 case JVM_SIGNATURE_DOUBLE:
5131 return signature + 1;
5132 case JVM_SIGNATURE_CLASS:
5133 {
5134 if (_major_version < JAVA_1_5_VERSION) {
5135 // Skip over the class name if one is there
5136 const char* const p = skip_over_field_name(signature + 1, true, --length);
5137
5138 // The next character better be a semicolon
5139 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5140 return p + 1;
5141 }
5142 }
5143 else {
5144 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5145 signature++;
5146 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5147 // Format check signature
5148 if (c != nullptr) {
5149 int newlen = pointer_delta_as_int(c, (char*) signature);
5150 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5151 if (!legal) {
5152 classfile_parse_error("Class name is empty or contains illegal character "
5153 "in descriptor in class file %s",
5154 THREAD);
5155 return nullptr;
5156 }
5157 return signature + newlen + 1;
5158 }
5159 }
5160 return nullptr;
5161 }
5162 case JVM_SIGNATURE_ARRAY:
5163 array_dim++;
5164 if (array_dim > 255) {
5165 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5166 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
5167 return nullptr;
5168 }
5169 // The rest of what's there better be a legal signature
5170 signature++;
5171 length--;
5172 void_ok = false;
5173 break;
5174 default:
5175 return nullptr;
5176 }
5177 }
5178 return nullptr;
5179 }
5180
5181 // Checks if name is a legal class name.
5182 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5183 if (!_need_verify || _relax_verify) { return; }
5184
5185 assert(name->refcount() > 0, "symbol must be kept alive");
5186 char* bytes = (char*)name->bytes();
5187 unsigned int length = name->utf8_length();
5188 bool legal = false;
5189
5190 if (length > 0) {
5191 const char* p;
5192 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5193 p = skip_over_field_signature(bytes, false, length, CHECK);
5194 legal = (p != nullptr) && ((p - bytes) == (int)length);
5195 } else if (_major_version < JAVA_1_5_VERSION) {
5196 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5197 p = skip_over_field_name(bytes, true, length);
5198 legal = (p != nullptr) && ((p - bytes) == (int)length);
5199 }
5200 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
5201 && bytes[length - 1] == ';' ) {
5202 // Support for L...; and Q...; descriptors
5203 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5204 } else {
5205 // 4900761: relax the constraints based on JSR202 spec
5206 // Class names may be drawn from the entire Unicode character set.
5207 // Identifiers between '/' must be unqualified names.
5208 // The utf8 string has been verified when parsing cpool entries.
5209 legal = verify_unqualified_name(bytes, length, LegalClass);
5210 }
5211 }
5212 if (!legal) {
5213 ResourceMark rm(THREAD);
5214 assert(_class_name != nullptr, "invariant");
5215 Exceptions::fthrow(
5216 THREAD_AND_LOCATION,
5217 vmSymbols::java_lang_ClassFormatError(),
5218 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5219 _class_name->as_C_string()
5220 );
5221 return;
5222 }
5223 }
5224
5225 // Checks if name is a legal field name.
5226 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5227 if (!_need_verify || _relax_verify) { return; }
5228
5229 char* bytes = (char*)name->bytes();
5230 unsigned int length = name->utf8_length();
5231 bool legal = false;
5232
5233 if (length > 0) {
5234 if (_major_version < JAVA_1_5_VERSION) {
5235 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5236 const char* p = skip_over_field_name(bytes, false, length);
5237 legal = (p != nullptr) && ((p - bytes) == (int)length);
5238 }
5239 } else {
5240 // 4881221: relax the constraints based on JSR202 spec
5241 legal = verify_unqualified_name(bytes, length, LegalField);
5242 }
5243 }
5244
5245 if (!legal) {
5246 ResourceMark rm(THREAD);
5247 assert(_class_name != nullptr, "invariant");
5248 Exceptions::fthrow(
5249 THREAD_AND_LOCATION,
5250 vmSymbols::java_lang_ClassFormatError(),
5251 "Illegal field name \"%.*s\" in class %s", length, bytes,
5252 _class_name->as_C_string()
5253 );
5254 return;
5255 }
5256 }
5257
5258 // Checks if name is a legal method name.
5259 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5260 if (!_need_verify || _relax_verify) { return; }
5261
5262 assert(name != nullptr, "method name is null");
5263 char* bytes = (char*)name->bytes();
5264 unsigned int length = name->utf8_length();
5265 bool legal = false;
5266
5267 if (length > 0) {
5268 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5269 if (name == vmSymbols::object_initializer_name() ||
5270 name == vmSymbols::class_initializer_name()) {
5271 legal = true;
5272 }
5273 } else if (_major_version < JAVA_1_5_VERSION) {
5274 const char* p;
5275 p = skip_over_field_name(bytes, false, length);
5276 legal = (p != nullptr) && ((p - bytes) == (int)length);
5277 } else {
5278 // 4881221: relax the constraints based on JSR202 spec
5279 legal = verify_unqualified_name(bytes, length, LegalMethod);
5280 }
5281 }
5282
5283 if (!legal) {
5284 ResourceMark rm(THREAD);
5285 assert(_class_name != nullptr, "invariant");
5286 Exceptions::fthrow(
5287 THREAD_AND_LOCATION,
5288 vmSymbols::java_lang_ClassFormatError(),
5289 "Illegal method name \"%.*s\" in class %s", length, bytes,
5290 _class_name->as_C_string()
5291 );
5292 return;
5293 }
5294 }
5295
5296 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5297 const char* const bytes = (const char*)signature->bytes();
5298 const unsigned int length = signature->utf8_length();
5299 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5300
5301 if (p == nullptr || (p - bytes) != (int)length) {
5302 return false;
5303 }
5304 return true;
5305 }
5306
5307 // Checks if signature is a legal field signature.
5308 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5309 const Symbol* signature,
5310 TRAPS) const {
5311 if (!_need_verify) { return; }
5312
5313 const char* const bytes = (const char*)signature->bytes();
5314 const unsigned int length = signature->utf8_length();
5315 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5316
5317 if (p == nullptr || (p - bytes) != (int)length) {
5318 throwIllegalSignature("Field", name, signature, CHECK);
5319 }
5320 }
5321
5322 // Check that the signature is compatible with the method name. For example,
5323 // check that <init> has a void signature.
5324 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5325 const Symbol* signature,
5326 TRAPS) const {
5327 if (!_need_verify) {
5328 return;
5329 }
5330
5331 // Class initializers cannot have args for class format version >= 51.
5332 if (name == vmSymbols::class_initializer_name() &&
5333 signature != vmSymbols::void_method_signature() &&
5334 _major_version >= JAVA_7_VERSION) {
5335 throwIllegalSignature("Method", name, signature, THREAD);
5336 return;
5337 }
5338
5339 int sig_length = signature->utf8_length();
5340 if (name->utf8_length() > 0 &&
5341 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5342 sig_length > 0 &&
5343 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5344 throwIllegalSignature("Method", name, signature, THREAD);
5345 }
5346 }
5347
5348 // Checks if signature is a legal method signature.
5349 // Returns number of parameters
5350 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5351 const Symbol* signature,
5352 TRAPS) const {
5353 if (!_need_verify) {
5354 // make sure caller's args_size will be less than 0 even for non-static
5355 // method so it will be recomputed in compute_size_of_parameters().
5356 return -2;
5357 }
5358
5359 unsigned int args_size = 0;
5360 const char* p = (const char*)signature->bytes();
5361 unsigned int length = signature->utf8_length();
5362 const char* nextp;
5363
5364 // The first character must be a '('
5365 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5366 length--;
5367 // Skip over legal field signatures
5368 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5369 while ((length > 0) && (nextp != nullptr)) {
5370 args_size++;
5371 if (p[0] == 'J' || p[0] == 'D') {
5372 args_size++;
5373 }
5374 length -= pointer_delta_as_int(nextp, p);
5375 p = nextp;
5376 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5377 }
5378 // The first non-signature thing better be a ')'
5379 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5380 length--;
5381 // Now we better just have a return value
5382 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5383 if (nextp && ((int)length == (nextp - p))) {
5384 return args_size;
5385 }
5386 }
5387 }
5388 // Report error
5389 throwIllegalSignature("Method", name, signature, THREAD);
5390 return 0;
5391 }
5392
5393 int ClassFileParser::static_field_size() const {
5394 assert(_field_info != nullptr, "invariant");
5395 return _field_info->_static_field_size;
5396 }
5397
5398 int ClassFileParser::total_oop_map_count() const {
5399 assert(_field_info != nullptr, "invariant");
5400 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5401 }
5402
5403 jint ClassFileParser::layout_size() const {
5404 assert(_field_info != nullptr, "invariant");
5405 return _field_info->_instance_size;
5406 }
5407
5408 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5409 const Array<Method*>* methods) {
5410 assert(ik != nullptr, "invariant");
5411 assert(methods != nullptr, "invariant");
5412
5413 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5414 // (We used to do this lazily, but now we query it in Rewriter,
5415 // which is eagerly done for every method, so we might as well do it now,
5416 // when everything is fresh in memory.)
5417 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5418
5419 if (klass_id != vmSymbolID::NO_SID) {
5420 for (int j = 0; j < methods->length(); ++j) {
5421 Method* method = methods->at(j);
5422 method->init_intrinsic_id(klass_id);
5423
5424 if (CheckIntrinsics) {
5425 // Check if an intrinsic is defined for method 'method',
5426 // but the method is not annotated with @IntrinsicCandidate.
5427 if (method->intrinsic_id() != vmIntrinsics::_none &&
5428 !method->intrinsic_candidate()) {
5429 tty->print("Compiler intrinsic is defined for method [%s], "
5430 "but the method is not annotated with @IntrinsicCandidate.%s",
5431 method->name_and_sig_as_C_string(),
5432 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5433 );
5434 tty->cr();
5435 DEBUG_ONLY(vm_exit(1));
5436 }
5437 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5438 // but there is no intrinsic available for it.
5439 if (method->intrinsic_candidate() &&
5440 method->intrinsic_id() == vmIntrinsics::_none) {
5441 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5442 "but no compiler intrinsic is defined for the method.%s",
5443 method->name_and_sig_as_C_string(),
5444 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5445 );
5446 tty->cr();
5447 DEBUG_ONLY(vm_exit(1));
5448 }
5449 }
5450 } // end for
5451
5452 #ifdef ASSERT
5453 if (CheckIntrinsics) {
5454 // Check for orphan methods in the current class. A method m
5455 // of a class C is orphan if an intrinsic is defined for method m,
5456 // but class C does not declare m.
5457 // The check is potentially expensive, therefore it is available
5458 // only in debug builds.
5459
5460 for (auto id : EnumRange<vmIntrinsicID>{}) {
5461 if (vmIntrinsics::_compiledLambdaForm == id) {
5462 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5463 // generated for the JVM from a LambdaForm and therefore no method
5464 // is defined for it.
5465 continue;
5466 }
5467 if (vmIntrinsics::_blackhole == id) {
5468 // The _blackhole intrinsic is a special marker. No explicit method
5469 // is defined for it.
5470 continue;
5471 }
5472
5473 if (vmIntrinsics::class_for(id) == klass_id) {
5474 // Check if the current class contains a method with the same
5475 // name, flags, signature.
5476 bool match = false;
5477 for (int j = 0; j < methods->length(); ++j) {
5478 const Method* method = methods->at(j);
5479 if (method->intrinsic_id() == id) {
5480 match = true;
5481 break;
5482 }
5483 }
5484
5485 if (!match) {
5486 char buf[1000];
5487 tty->print("Compiler intrinsic is defined for method [%s], "
5488 "but the method is not available in class [%s].%s",
5489 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5490 ik->name()->as_C_string(),
5491 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5492 );
5493 tty->cr();
5494 DEBUG_ONLY(vm_exit(1));
5495 }
5496 }
5497 } // end for
5498 } // CheckIntrinsics
5499 #endif // ASSERT
5500 }
5501 }
5502
5503 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5504 const ClassInstanceInfo& cl_inst_info,
5505 TRAPS) {
5506 if (_klass != nullptr) {
5507 return _klass;
5508 }
5509
5510 InstanceKlass* const ik =
5511 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5512
5513 if (is_hidden()) {
5514 mangle_hidden_class_name(ik);
5515 }
5516
5517 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5518
5519 assert(_klass == ik, "invariant");
5520 return ik;
5521 }
5522
5523 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5524 bool changed_by_loadhook,
5525 const ClassInstanceInfo& cl_inst_info,
5526 TRAPS) {
5527 assert(ik != nullptr, "invariant");
5528
5529 // Set name and CLD before adding to CLD
5530 ik->set_class_loader_data(_loader_data);
5531 ik->set_name(_class_name);
5532
5533 // Add all classes to our internal class loader list here,
5534 // including classes in the bootstrap (null) class loader.
5535 const bool publicize = !is_internal();
5536
5537 _loader_data->add_class(ik, publicize);
5538
5539 set_klass_to_deallocate(ik);
5540
5541 assert(_field_info != nullptr, "invariant");
5542 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5543 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5544 "sanity");
5545
5546 assert(ik->is_instance_klass(), "sanity");
5547 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5548
5549 // Fill in information already parsed
5550 ik->set_should_verify_class(_need_verify);
5551
5552 // Not yet: supers are done below to support the new subtype-checking fields
5553 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5554 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5555 if (_field_info->_is_naturally_atomic && ik->is_inline_klass()) {
5556 ik->set_is_naturally_atomic();
5557 }
5558
5559 assert(_fac != nullptr, "invariant");
5560 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_INLINE]);
5561
5562 // this transfers ownership of a lot of arrays from
5563 // the parser onto the InstanceKlass*
5564 apply_parsed_class_metadata(ik, _java_fields_count);
5565 if (ik->is_inline_klass()) {
5566 InlineKlass::cast(ik)->init_fixed_block();
5567 }
5568
5569 // can only set dynamic nest-host after static nest information is set
5570 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5571 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5572 }
5573
5574 // note that is not safe to use the fields in the parser from this point on
5575 assert(nullptr == _cp, "invariant");
5576 assert(nullptr == _fieldinfo_stream, "invariant");
5577 assert(nullptr == _fields_status, "invariant");
5578 assert(nullptr == _methods, "invariant");
5579 assert(nullptr == _inner_classes, "invariant");
5580 assert(nullptr == _nest_members, "invariant");
5581 assert(nullptr == _loadable_descriptors, "invariant");
5582 assert(nullptr == _combined_annotations, "invariant");
5583 assert(nullptr == _record_components, "invariant");
5584 assert(nullptr == _permitted_subclasses, "invariant");
5585 assert(nullptr == _inline_type_field_klasses, "invariant");
5586
5587 if (_has_localvariable_table) {
5588 ik->set_has_localvariable_table(true);
5589 }
5590
5591 if (_has_final_method) {
5592 ik->set_has_final_method();
5593 }
5594
5595 ik->copy_method_ordering(_method_ordering, CHECK);
5596 // The InstanceKlass::_methods_jmethod_ids cache
5597 // is managed on the assumption that the initial cache
5598 // size is equal to the number of methods in the class. If
5599 // that changes, then InstanceKlass::idnum_can_increment()
5600 // has to be changed accordingly.
5601 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5602
5603 ik->set_this_class_index(_this_class_index);
5604
5605 if (_is_hidden) {
5606 // _this_class_index is a CONSTANT_Class entry that refers to this
5607 // hidden class itself. If this class needs to refer to its own methods
5608 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5609 // _this_class_index. However, because this class is hidden (it's
5610 // not stored in SystemDictionary), _this_class_index cannot be resolved
5611 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5612 // Therefore, we must eagerly resolve _this_class_index now.
5613 ik->constants()->klass_at_put(_this_class_index, ik);
5614 }
5615
5616 ik->set_minor_version(_minor_version);
5617 ik->set_major_version(_major_version);
5618 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5619 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5620
5621 if (_must_be_atomic) {
5622 ik->set_must_be_atomic();
5623 }
5624 if (_is_implicitly_constructible) {
5625 ik->set_is_implicitly_constructible();
5626 }
5627 if (_is_hidden) {
5628 ik->set_is_hidden();
5629 }
5630
5631 // Set PackageEntry for this_klass
5632 oop cl = ik->class_loader();
5633 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5634 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5635 ik->set_package(cld, nullptr, CHECK);
5636
5637 const Array<Method*>* const methods = ik->methods();
5638 assert(methods != nullptr, "invariant");
5639 const int methods_len = methods->length();
5640
5641 check_methods_for_intrinsics(ik, methods);
5642
5643 // Fill in field values obtained by parse_classfile_attributes
5644 if (_parsed_annotations->has_any_annotations()) {
5645 _parsed_annotations->apply_to(ik);
5646 }
5647
5648 apply_parsed_class_attributes(ik);
5649
5650 // Miranda methods
5651 if ((_num_miranda_methods > 0) ||
5652 // if this class introduced new miranda methods or
5653 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5654 // super class exists and this class inherited miranda methods
5655 ) {
5656 ik->set_has_miranda_methods(); // then set a flag
5657 }
5658
5659 // Fill in information needed to compute superclasses.
5660 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5661 ik->set_transitive_interfaces(_transitive_interfaces);
5662 ik->set_local_interfaces(_local_interfaces);
5663 _transitive_interfaces = nullptr;
5664 _local_interfaces = nullptr;
5665
5666 // Initialize itable offset tables
5667 klassItable::setup_itable_offset_table(ik);
5668
5669 // Compute transitive closure of interfaces this class implements
5670 // Do final class setup
5671 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5672 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5673 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5674 }
5675
5676 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5677 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5678 ik->set_has_contended_annotations(true);
5679 }
5680
5681 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5682 set_precomputed_flags(ik);
5683
5684 // check if this class can access its super class
5685 check_super_class_access(ik, CHECK);
5686
5687 // check if this class can access its superinterfaces
5688 check_super_interface_access(ik, CHECK);
5689
5690 // check if this class overrides any final method
5691 check_final_method_override(ik, CHECK);
5692
5693 // reject static interface methods prior to Java 8
5694 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5695 check_illegal_static_method(ik, CHECK);
5696 }
5697
5698 // Obtain this_klass' module entry
5699 ModuleEntry* module_entry = ik->module();
5700 assert(module_entry != nullptr, "module_entry should always be set");
5701
5702 // Obtain java.lang.Module
5703 Handle module_handle(THREAD, module_entry->module());
5704
5705 // Allocate mirror and initialize static fields
5706 // The create_mirror() call will also call compute_modifiers()
5707 java_lang_Class::create_mirror(ik,
5708 Handle(THREAD, _loader_data->class_loader()),
5709 module_handle,
5710 _protection_domain,
5711 cl_inst_info.class_data(),
5712 CHECK);
5713
5714 assert(_all_mirandas != nullptr, "invariant");
5715
5716 // Generate any default methods - default methods are public interface methods
5717 // that have a default implementation. This is new with Java 8.
5718 if (_has_nonstatic_concrete_methods) {
5719 DefaultMethods::generate_default_methods(ik,
5720 _all_mirandas,
5721 CHECK);
5722 }
5723
5724 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5725 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5726 !module_entry->has_default_read_edges()) {
5727 if (!module_entry->set_has_default_read_edges()) {
5728 // We won a potential race
5729 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5730 }
5731 }
5732
5733 bool all_fields_empty = true;
5734 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
5735 if (!fs.access_flags().is_static()) {
5736 if (fs.field_descriptor().is_null_free_inline_type()) {
5737 Klass* k = ik->inline_type_field_klasses_array()->at(fs.index());
5738 assert(k->is_inline_klass(), "must be");
5739 if (!InlineKlass::cast(k)->is_empty_inline_type()) { all_fields_empty = false; }
5740 } else {
5741 all_fields_empty = false;
5742 }
5743 } else if (is_inline_type() && (fs.name() == vmSymbols::default_value_name())) {
5744 InlineKlass::cast(ik)->set_default_value_offset(ik->field_offset(fs.index()));
5745 }
5746 }
5747
5748 if (_is_empty_inline_type || (is_inline_type() && all_fields_empty)) {
5749 ik->set_is_empty_inline_type();
5750 }
5751
5752 if (is_inline_type()) {
5753 InlineKlass* vk = InlineKlass::cast(ik);
5754 vk->set_alignment(_alignment);
5755 vk->set_first_field_offset(_first_field_offset);
5756 vk->set_payload_size_in_bytes(_payload_size_in_bytes);
5757 vk->set_internal_null_marker_offset(_internal_null_marker_offset);
5758 InlineKlass::cast(ik)->initialize_calling_convention(CHECK);
5759 }
5760
5761 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5762
5763 if (!is_internal()) {
5764 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5765
5766 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5767 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5768 log_is_enabled(Info, class, preview)) {
5769 ResourceMark rm;
5770 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5771 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5772 }
5773
5774 if (log_is_enabled(Debug, class, resolve)) {
5775 ResourceMark rm;
5776 // print out the superclass.
5777 const char * from = ik->external_name();
5778 if (ik->java_super() != nullptr) {
5779 log_debug(class, resolve)("%s %s (super)",
5780 from,
5781 ik->java_super()->external_name());
5782 }
5783 // print out each of the interface classes referred to by this class.
5784 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5785 if (local_interfaces != nullptr) {
5786 const int length = local_interfaces->length();
5787 for (int i = 0; i < length; i++) {
5788 const InstanceKlass* const k = local_interfaces->at(i);
5789 const char * to = k->external_name();
5790 log_debug(class, resolve)("%s %s (interface)", from, to);
5791 }
5792 }
5793 }
5794 }
5795
5796 JFR_ONLY(INIT_ID(ik);)
5797
5798 // If we reach here, all is well.
5799 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5800 // in order for it to not be destroyed in the ClassFileParser destructor.
5801 set_klass_to_deallocate(nullptr);
5802
5803 // it's official
5804 set_klass(ik);
5805
5806 debug_only(ik->verify();)
5807 }
5808
5809 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5810 // Decrement the refcount in the old name, since we're clobbering it.
5811 _class_name->decrement_refcount();
5812
5813 _class_name = new_class_name;
5814 // Increment the refcount of the new name.
5815 // Now the ClassFileParser owns this name and will decrement in
5816 // the destructor.
5817 _class_name->increment_refcount();
5818 }
5819
5820 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5821 bool trusted = loader_data->is_boot_class_loader_data() ||
5822 loader_data->is_platform_class_loader_data();
5823 bool need_verify =
5824 // verifyAll
5825 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5826 // verifyRemote
5827 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5828 return !need_verify;
5829 }
5830
5831 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5832 Symbol* name,
5833 ClassLoaderData* loader_data,
5834 const ClassLoadInfo* cl_info,
5835 Publicity pub_level,
5836 TRAPS) :
5837 _stream(stream),
5838 _class_name(nullptr),
5839 _loader_data(loader_data),
5840 _is_hidden(cl_info->is_hidden()),
5841 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5842 _orig_cp_size(0),
5843 _super_klass(),
5844 _cp(nullptr),
5845 _fieldinfo_stream(nullptr),
5846 _fields_status(nullptr),
5847 _methods(nullptr),
5848 _inner_classes(nullptr),
5849 _nest_members(nullptr),
5850 _nest_host(0),
5851 _permitted_subclasses(nullptr),
5852 _loadable_descriptors(nullptr),
5853 _record_components(nullptr),
5854 _local_interfaces(nullptr),
5855 _local_interface_indexes(nullptr),
5856 _transitive_interfaces(nullptr),
5857 _combined_annotations(nullptr),
5858 _class_annotations(nullptr),
5859 _class_type_annotations(nullptr),
5860 _fields_annotations(nullptr),
5861 _fields_type_annotations(nullptr),
5862 _klass(nullptr),
5863 _klass_to_deallocate(nullptr),
5864 _parsed_annotations(nullptr),
5865 _fac(nullptr),
5866 _field_info(nullptr),
5867 _inline_type_field_klasses(nullptr),
5868 _null_marker_offsets(nullptr),
5869 _temp_field_info(nullptr),
5870 _method_ordering(nullptr),
5871 _all_mirandas(nullptr),
5872 _vtable_size(0),
5873 _itable_size(0),
5874 _num_miranda_methods(0),
5875 _protection_domain(cl_info->protection_domain()),
5876 _access_flags(),
5877 _pub_level(pub_level),
5878 _bad_constant_seen(0),
5879 _synthetic_flag(false),
5880 _sde_length(false),
5881 _sde_buffer(nullptr),
5882 _sourcefile_index(0),
5883 _generic_signature_index(0),
5884 _major_version(0),
5885 _minor_version(0),
5886 _this_class_index(0),
5887 _super_class_index(0),
5888 _itfs_len(0),
5889 _java_fields_count(0),
5890 _need_verify(false),
5891 _relax_verify(false),
5892 _has_nonstatic_concrete_methods(false),
5893 _declares_nonstatic_concrete_methods(false),
5894 _has_localvariable_table(false),
5895 _has_final_method(false),
5896 _has_contended_fields(false),
5897 _has_inline_type_fields(false),
5898 _has_nonstatic_fields(false),
5899 _is_empty_inline_type(false),
5900 _is_naturally_atomic(false),
5901 _must_be_atomic(true),
5902 _is_implicitly_constructible(false),
5903 _has_loosely_consistent_annotation(false),
5904 _has_implicitly_constructible_annotation(false),
5905 _has_finalizer(false),
5906 _has_empty_finalizer(false),
5907 _has_vanilla_constructor(false),
5908 _max_bootstrap_specifier_index(-1) {
5909
5910 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5911 _class_name->increment_refcount();
5912
5913 assert(_loader_data != nullptr, "invariant");
5914 assert(stream != nullptr, "invariant");
5915 assert(_stream != nullptr, "invariant");
5916 assert(_stream->buffer() == _stream->current(), "invariant");
5917 assert(_class_name != nullptr, "invariant");
5918 assert(0 == _access_flags.as_int(), "invariant");
5919
5920 // Figure out whether we can skip format checking (matching classic VM behavior)
5921 if (CDSConfig::is_dumping_static_archive()) {
5922 // verify == true means it's a 'remote' class (i.e., non-boot class)
5923 // Verification decision is based on BytecodeVerificationRemote flag
5924 // for those classes.
5925 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5926 BytecodeVerificationLocal;
5927 }
5928 else {
5929 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5930 stream->need_verify());
5931 }
5932
5933 // synch back verification state to stream
5934 stream->set_verify(_need_verify);
5935
5936 // Check if verification needs to be relaxed for this class file
5937 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5938 _relax_verify = relax_format_check_for(_loader_data);
5939
5940 parse_stream(stream, CHECK);
5941
5942 post_process_parsed_stream(stream, _cp, CHECK);
5943 }
5944
5945 void ClassFileParser::clear_class_metadata() {
5946 // metadata created before the instance klass is created. Must be
5947 // deallocated if classfile parsing returns an error.
5948 _cp = nullptr;
5949 _fieldinfo_stream = nullptr;
5950 _fields_status = nullptr;
5951 _methods = nullptr;
5952 _inner_classes = nullptr;
5953 _nest_members = nullptr;
5954 _permitted_subclasses = nullptr;
5955 _loadable_descriptors = nullptr;
5956 _combined_annotations = nullptr;
5957 _class_annotations = _class_type_annotations = nullptr;
5958 _fields_annotations = _fields_type_annotations = nullptr;
5959 _record_components = nullptr;
5960 _inline_type_field_klasses = nullptr;
5961 _null_marker_offsets = nullptr;
5962 }
5963
5964 // Destructor to clean up
5965 ClassFileParser::~ClassFileParser() {
5966 _class_name->decrement_refcount();
5967
5968 if (_cp != nullptr) {
5969 MetadataFactory::free_metadata(_loader_data, _cp);
5970 }
5971
5972 if (_fieldinfo_stream != nullptr) {
5973 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5974 }
5975
5976 if (_fields_status != nullptr) {
5977 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5978 }
5979
5980 if (_inline_type_field_klasses != nullptr) {
5981 MetadataFactory::free_array<InlineKlass*>(_loader_data, _inline_type_field_klasses);
5982 }
5983
5984 if (_null_marker_offsets != nullptr) {
5985 MetadataFactory::free_array<int>(_loader_data, _null_marker_offsets);
5986 }
5987
5988 if (_methods != nullptr) {
5989 // Free methods
5990 InstanceKlass::deallocate_methods(_loader_data, _methods);
5991 }
5992
5993 // beware of the Universe::empty_blah_array!!
5994 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5995 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5996 }
5997
5998 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5999 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6000 }
6001
6002 if (_record_components != nullptr) {
6003 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6004 }
6005
6006 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
6007 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
6008 }
6009
6010 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
6011 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
6012 }
6013
6014 // Free interfaces
6015 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6016 _local_interfaces, _transitive_interfaces);
6017
6018 if (_combined_annotations != nullptr) {
6019 // After all annotations arrays have been created, they are installed into the
6020 // Annotations object that will be assigned to the InstanceKlass being created.
6021
6022 // Deallocate the Annotations object and the installed annotations arrays.
6023 _combined_annotations->deallocate_contents(_loader_data);
6024
6025 // If the _combined_annotations pointer is non-null,
6026 // then the other annotations fields should have been cleared.
6027 assert(_class_annotations == nullptr, "Should have been cleared");
6028 assert(_class_type_annotations == nullptr, "Should have been cleared");
6029 assert(_fields_annotations == nullptr, "Should have been cleared");
6030 assert(_fields_type_annotations == nullptr, "Should have been cleared");
6031 } else {
6032 // If the annotations arrays were not installed into the Annotations object,
6033 // then they have to be deallocated explicitly.
6034 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6035 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6036 Annotations::free_contents(_loader_data, _fields_annotations);
6037 Annotations::free_contents(_loader_data, _fields_type_annotations);
6038 }
6039
6040 clear_class_metadata();
6041 _transitive_interfaces = nullptr;
6042 _local_interfaces = nullptr;
6043
6044 // deallocate the klass if already created. Don't directly deallocate, but add
6045 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6046 // at a safepoint.
6047 if (_klass_to_deallocate != nullptr) {
6048 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6049 }
6050 }
6051
6052 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6053 TRAPS) {
6054
6055 assert(stream != nullptr, "invariant");
6056 assert(_class_name != nullptr, "invariant");
6057
6058 // BEGIN STREAM PARSING
6059 stream->guarantee_more(8, CHECK); // magic, major, minor
6060 // Magic value
6061 const u4 magic = stream->get_u4_fast();
6062 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6063 "Incompatible magic value %u in class file %s",
6064 magic, CHECK);
6065
6066 // Version numbers
6067 _minor_version = stream->get_u2_fast();
6068 _major_version = stream->get_u2_fast();
6069
6070 // Check version numbers - we check this even with verifier off
6071 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6072
6073 stream->guarantee_more(3, CHECK); // length, first cp tag
6074 u2 cp_size = stream->get_u2_fast();
6075
6076 guarantee_property(
6077 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6078 cp_size, CHECK);
6079
6080 _orig_cp_size = cp_size;
6081 if (is_hidden()) { // Add a slot for hidden class name.
6082 cp_size++;
6083 }
6084
6085 _cp = ConstantPool::allocate(_loader_data,
6086 cp_size,
6087 CHECK);
6088
6089 ConstantPool* const cp = _cp;
6090
6091 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6092
6093 assert(cp_size == (u2)cp->length(), "invariant");
6094
6095 // ACCESS FLAGS
6096 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6097
6098 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6099 // JVM_ACC_MODULE is defined in JDK-9 and later.
6100 if (_major_version >= JAVA_9_VERSION) {
6101 recognized_modifiers |= JVM_ACC_MODULE;
6102 }
6103
6104 // Access flags
6105 jint flags = stream->get_u2_fast() & recognized_modifiers;
6106
6107 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6108 // Set abstract bit for old class files for backward compatibility
6109 flags |= JVM_ACC_ABSTRACT;
6110 }
6111
6112 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
6113 if (!supports_inline_types()) {
6114 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6115 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6116 if (!is_module && !is_interface) {
6117 flags |= JVM_ACC_IDENTITY;
6118 }
6119 }
6120
6121
6122 // This class and superclass
6123 _this_class_index = stream->get_u2_fast();
6124 check_property(
6125 valid_cp_range(_this_class_index, cp_size) &&
6126 cp->tag_at(_this_class_index).is_unresolved_klass(),
6127 "Invalid this class index %u in constant pool in class file %s",
6128 _this_class_index, CHECK);
6129
6130 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6131 assert(class_name_in_cp != nullptr, "class_name can't be null");
6132
6133 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
6134
6135 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
6136
6137 _access_flags.set_flags(flags);
6138
6139 short bad_constant = class_bad_constant_seen();
6140 if (bad_constant != 0) {
6141 // Do not throw CFE until after the access_flags are checked because if
6142 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6143 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6144 return;
6145 }
6146
6147 // Don't need to check whether this class name is legal or not.
6148 // It has been checked when constant pool is parsed.
6149 // However, make sure it is not an array type.
6150 if (_need_verify) {
6151 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6152 "Bad class name in class file %s",
6153 CHECK);
6154 }
6155
6156 #ifdef ASSERT
6157 // Basic sanity checks
6158 if (_is_hidden) {
6159 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6160 }
6161 #endif
6162
6163 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
6164
6165 if (_is_hidden) {
6166 assert(_class_name != nullptr, "Unexpected null _class_name");
6167 #ifdef ASSERT
6168 if (_need_verify) {
6169 verify_legal_class_name(_class_name, CHECK);
6170 }
6171 #endif
6172
6173 } else {
6174 // Check if name in class file matches given name
6175 if (_class_name != class_name_in_cp) {
6176 if (_class_name != vmSymbols::unknown_class_name()) {
6177 ResourceMark rm(THREAD);
6178 Exceptions::fthrow(THREAD_AND_LOCATION,
6179 vmSymbols::java_lang_NoClassDefFoundError(),
6180 "%s (wrong name: %s)",
6181 _class_name->as_C_string(),
6182 class_name_in_cp->as_C_string()
6183 );
6184 return;
6185 } else {
6186 // The class name was not known by the caller so we set it from
6187 // the value in the CP.
6188 update_class_name(class_name_in_cp);
6189 }
6190 // else nothing to do: the expected class name matches what is in the CP
6191 }
6192 }
6193
6194 // Verification prevents us from creating names with dots in them, this
6195 // asserts that that's the case.
6196 assert(is_internal_format(_class_name), "external class name format used internally");
6197
6198 if (!is_internal()) {
6199 LogTarget(Debug, class, preorder) lt;
6200 if (lt.is_enabled()){
6201 ResourceMark rm(THREAD);
6202 LogStream ls(lt);
6203 ls.print("%s", _class_name->as_klass_external_name());
6204 if (stream->source() != nullptr) {
6205 ls.print(" source: %s", stream->source());
6206 }
6207 ls.cr();
6208 }
6209 }
6210
6211 // SUPERKLASS
6212 _super_class_index = stream->get_u2_fast();
6213 _super_klass = parse_super_class(cp,
6214 _super_class_index,
6215 _need_verify,
6216 CHECK);
6217
6218 // Interfaces
6219 _itfs_len = stream->get_u2_fast();
6220 parse_interfaces(stream,
6221 _itfs_len,
6222 cp,
6223 &_has_nonstatic_concrete_methods,
6224 CHECK);
6225
6226 // Fields (offsets are filled in later)
6227 _fac = new FieldAllocationCount();
6228 parse_fields(stream,
6229 _access_flags,
6230 _fac,
6231 cp,
6232 cp_size,
6233 &_java_fields_count,
6234 CHECK);
6235
6236 assert(_temp_field_info != nullptr, "invariant");
6237
6238 // Methods
6239 parse_methods(stream,
6240 is_interface(),
6241 !is_identity_class(),
6242 is_abstract_class(),
6243 &_has_localvariable_table,
6244 &_has_final_method,
6245 &_declares_nonstatic_concrete_methods,
6246 CHECK);
6247
6248 assert(_methods != nullptr, "invariant");
6249
6250 if (_declares_nonstatic_concrete_methods) {
6251 _has_nonstatic_concrete_methods = true;
6252 }
6253
6254 // Additional attributes/annotations
6255 _parsed_annotations = new ClassAnnotationCollector();
6256 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6257
6258 assert(_inner_classes != nullptr, "invariant");
6259
6260 // Finalize the Annotations metadata object,
6261 // now that all annotation arrays have been created.
6262 create_combined_annotations(CHECK);
6263
6264 // Make sure this is the end of class file stream
6265 guarantee_property(stream->at_eos(),
6266 "Extra bytes at the end of class file %s",
6267 CHECK);
6268
6269 // all bytes in stream read and parsed
6270 }
6271
6272 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6273 ResourceMark rm;
6274 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6275 // use a '/' because that confuses finding the class's package. Also, can't
6276 // use an illegal char such as ';' because that causes serialization issues
6277 // and issues with hidden classes that create their own hidden classes.
6278 char addr_buf[20];
6279 if (CDSConfig::is_dumping_static_archive()) {
6280 // We want stable names for the archived hidden classes (only for static
6281 // archive for now). Spaces under default_SharedBaseAddress() will be
6282 // occupied by the archive at run time, so we know that no dynamically
6283 // loaded InstanceKlass will be placed under there.
6284 static volatile size_t counter = 0;
6285 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6286 size_t new_id = Atomic::add(&counter, (size_t)1);
6287 jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
6288 } else {
6289 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6290 }
6291 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6292 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6293 jio_snprintf(new_name, new_name_len, "%s+%s",
6294 _class_name->as_C_string(), addr_buf);
6295 update_class_name(SymbolTable::new_symbol(new_name));
6296
6297 // Add a Utf8 entry containing the hidden name.
6298 assert(_class_name != nullptr, "Unexpected null _class_name");
6299 int hidden_index = _orig_cp_size; // this is an extra slot we added
6300 _cp->symbol_at_put(hidden_index, _class_name);
6301
6302 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6303 // We have to update the resolved_klass_index and the name_index together
6304 // so extract the existing resolved_klass_index first.
6305 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6306 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6307 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6308 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6309 "Bad name_index");
6310 }
6311
6312 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6313 ConstantPool* cp,
6314 TRAPS) {
6315 assert(stream != nullptr, "invariant");
6316 assert(stream->at_eos(), "invariant");
6317 assert(cp != nullptr, "invariant");
6318 assert(_loader_data != nullptr, "invariant");
6319
6320 if (_class_name == vmSymbols::java_lang_Object()) {
6321 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6322 "java.lang.Object cannot implement an interface in class file %s",
6323 CHECK);
6324 }
6325 // We check super class after class file is parsed and format is checked
6326 if (_super_class_index > 0 && nullptr == _super_klass) {
6327 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6328 if (is_interface()) {
6329 // Before attempting to resolve the superclass, check for class format
6330 // errors not checked yet.
6331 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6332 "Interfaces must have java.lang.Object as superclass in class file %s",
6333 CHECK);
6334 }
6335 Handle loader(THREAD, _loader_data->class_loader());
6336 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6337 _super_klass = vmClasses::Object_klass();
6338 } else {
6339 _super_klass = (const InstanceKlass*)
6340 SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6341 super_class_name,
6342 loader,
6343 _protection_domain,
6344 true,
6345 CHECK);
6346 }
6347 }
6348
6349 if (_super_klass != nullptr) {
6350 if (_super_klass->is_interface()) {
6351 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6352 return;
6353 }
6354
6355 if (_super_klass->is_final()) {
6356 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6357 return;
6358 }
6359
6360 if (EnableValhalla) {
6361 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6362 }
6363
6364 if (_super_klass->has_nonstatic_concrete_methods()) {
6365 _has_nonstatic_concrete_methods = true;
6366 }
6367 }
6368
6369 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6370 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6371 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6372 _class_name->as_klass_external_name()));
6373 }
6374 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_ImplicitlyConstructible) && _access_flags.is_identity_class()) {
6375 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6376 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.ImplicitlyConstructible, because it is not a value class",
6377 _class_name->as_klass_external_name()));
6378 }
6379
6380 // Determining is the class allows tearing or not (default is not)
6381 // Test might need extensions when field inheritance is added for value classes
6382 if (EnableValhalla && !_access_flags.is_identity_class()) {
6383 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6384 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6385 _must_be_atomic = false;
6386 }
6387 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_ImplicitlyConstructible)
6388 && (_super_klass == vmClasses::Object_klass() || _super_klass->is_implicitly_constructible())) {
6389 _is_implicitly_constructible = true;
6390 }
6391 // Apply VM options override
6392 if (*ForceNonTearable != '\0') {
6393 // Allow a command line switch to force the same atomicity property:
6394 const char* class_name_str = _class_name->as_C_string();
6395 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6396 _must_be_atomic = true;
6397 }
6398 }
6399 }
6400
6401 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6402 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6403 if (_local_interface_indexes != nullptr) {
6404 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6405 u2 interface_index = _local_interface_indexes->at(i);
6406 Klass* interf;
6407 if (cp->tag_at(interface_index).is_klass()) {
6408 interf = cp->resolved_klass_at(interface_index);
6409 } else {
6410 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6411
6412 // Don't need to check legal name because it's checked when parsing constant pool.
6413 // But need to make sure it's not an array type.
6414 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6415 "Bad interface name in class file %s", CHECK);
6416
6417 // Call resolve_super so class circularity is checked
6418 interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6419 _class_name,
6420 unresolved_klass,
6421 Handle(THREAD, _loader_data->class_loader()),
6422 _protection_domain,
6423 false,
6424 CHECK);
6425 }
6426
6427 if (!interf->is_interface()) {
6428 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6429 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6430 _class_name->as_klass_external_name(),
6431 interf->external_name(),
6432 interf->class_in_module_of_loader()));
6433 }
6434
6435 if (EnableValhalla) {
6436 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6437 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6438 }
6439
6440 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6441 _has_nonstatic_concrete_methods = true;
6442 }
6443 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6444 }
6445 }
6446 assert(_local_interfaces != nullptr, "invariant");
6447
6448 // Compute the transitive list of all unique interfaces implemented by this class
6449 _transitive_interfaces =
6450 compute_transitive_interfaces(_super_klass,
6451 _local_interfaces,
6452 _loader_data,
6453 CHECK);
6454
6455 assert(_transitive_interfaces != nullptr, "invariant");
6456
6457 // sort methods
6458 _method_ordering = sort_methods(_methods);
6459
6460 _all_mirandas = new GrowableArray<Method*>(20);
6461
6462 Handle loader(THREAD, _loader_data->class_loader());
6463 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6464 &_num_miranda_methods,
6465 _all_mirandas,
6466 _super_klass,
6467 _methods,
6468 _access_flags,
6469 _major_version,
6470 loader,
6471 _class_name,
6472 _local_interfaces);
6473
6474 // Size of Java itable (in words)
6475 _itable_size = is_interface() ? 0 :
6476 klassItable::compute_itable_size(_transitive_interfaces);
6477
6478 assert(_fac != nullptr, "invariant");
6479 assert(_parsed_annotations != nullptr, "invariant");
6480
6481 if (EnableValhalla) {
6482 _inline_type_field_klasses = MetadataFactory::new_array<InlineKlass*>(_loader_data,
6483 java_fields_count(),
6484 nullptr,
6485 CHECK);
6486 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6487 FieldInfo fieldinfo = *it;
6488 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6489 Symbol* sig = fieldinfo.signature(cp);
6490 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6491 // Pre-load classes of null-free fields that are candidate for flattening
6492 TempNewSymbol s = Signature::strip_envelope(sig);
6493 if (s == _class_name) {
6494 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(), err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6495 }
6496 log_info(class, preload)("Preloading class %s during loading of class %s. Cause: a null-free non-static field is declared with this type", s->as_C_string(), _class_name->as_C_string());
6497 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s, Handle(THREAD, _loader_data->class_loader()), _protection_domain, false, THREAD);
6498 if (HAS_PENDING_EXCEPTION) {
6499 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) failed: %s",
6500 s->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6501 return; // Exception is still pending
6502 }
6503 assert(klass != nullptr, "Sanity check");
6504 if (klass->access_flags().is_identity_class()) {
6505 assert(klass->is_instance_klass(), "Sanity check");
6506 ResourceMark rm(THREAD);
6507 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6508 err_msg("Class %s expects class %s to be a value class, but it is an identity class",
6509 _class_name->as_C_string(),
6510 InstanceKlass::cast(klass)->external_name()));
6511 }
6512 if (klass->is_abstract()) {
6513 assert(klass->is_instance_klass(), "Sanity check");
6514 ResourceMark rm(THREAD);
6515 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6516 err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
6517 _class_name->as_C_string(),
6518 InstanceKlass::cast(klass)->external_name()));
6519 }
6520 InlineKlass* vk = InlineKlass::cast(klass);
6521 if (!vk->is_implicitly_constructible()) {
6522 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6523 err_msg("class %s is not implicitly constructible and it is used in a null restricted non-static field (not supported)",
6524 klass->name()->as_C_string()));
6525 }
6526 _inline_type_field_klasses->at_put(fieldinfo.index(), vk);
6527 log_info(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) succeeded", s->as_C_string(), _class_name->as_C_string());
6528 } else if (Signature::has_envelope(sig)) {
6529 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6530 // Those classes would be required later for the flattening of nullable inline type fields
6531 TempNewSymbol name = Signature::strip_envelope(sig);
6532 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6533 log_info(class, preload)("Preloading class %s during loading of class %s. Cause: field type in LoadableDescriptors attribute", name->as_C_string(), _class_name->as_C_string());
6534 oop loader = loader_data()->class_loader();
6535 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name, Handle(THREAD, loader), _protection_domain, false, THREAD);
6536 if (klass != nullptr) {
6537 if (klass->is_inline_klass()) {
6538 _inline_type_field_klasses->at_put(fieldinfo.index(), InlineKlass::cast(klass));
6539 log_info(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) succeeded", name->as_C_string(), _class_name->as_C_string());
6540 } else {
6541 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6542 log_warning(class, preload)("Preloading class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) but loaded class is not a value class", name->as_C_string(), _class_name->as_C_string());
6543 }
6544 } else {
6545 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) failed : %s",
6546 name->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6547 }
6548 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6549 if (HAS_PENDING_EXCEPTION) {
6550 CLEAR_PENDING_EXCEPTION;
6551 }
6552 }
6553 }
6554 }
6555 }
6556
6557 _field_info = new FieldLayoutInfo();
6558 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6559 _parsed_annotations->is_contended(), is_inline_type(),
6560 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6561 _field_info, _inline_type_field_klasses);
6562 lb.build_layout();
6563 if (is_inline_type()) {
6564 _alignment = lb.get_alignment();
6565 _first_field_offset = lb.get_first_field_offset();
6566 _payload_size_in_bytes = lb.get_payload_size_in_byte();
6567 _internal_null_marker_offset = lb.get_internal_null_marker_offset();
6568 }
6569 _has_inline_type_fields = _field_info->_has_inline_fields;
6570
6571 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6572 _fieldinfo_stream =
6573 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6574 injected_fields_count, loader_data(), CHECK);
6575
6576 _fields_status =
6577 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6578 FieldStatus(0), CHECK);
6579 if (_field_info->_has_null_marker_offsets) {
6580 int idx = 0;
6581 _null_marker_offsets = MetadataFactory::new_array<int>(_loader_data, _temp_field_info->length(), 0, CHECK);
6582 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it, ++idx) {
6583 FieldInfo fieldinfo = *it;
6584 if (fieldinfo.field_flags().has_null_marker()) {
6585 assert(fieldinfo.null_marker_offset() != 0, "Invalid value");
6586 _null_marker_offsets->at_put(idx, fieldinfo.null_marker_offset());
6587 }
6588 }
6589 }
6590 }
6591
6592 void ClassFileParser::set_klass(InstanceKlass* klass) {
6593
6594 #ifdef ASSERT
6595 if (klass != nullptr) {
6596 assert(nullptr == _klass, "leaking?");
6597 }
6598 #endif
6599
6600 _klass = klass;
6601 }
6602
6603 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6604
6605 #ifdef ASSERT
6606 if (klass != nullptr) {
6607 assert(nullptr == _klass_to_deallocate, "leaking?");
6608 }
6609 #endif
6610
6611 _klass_to_deallocate = klass;
6612 }
6613
6614 // Caller responsible for ResourceMark
6615 // clone stream with rewound position
6616 const ClassFileStream* ClassFileParser::clone_stream() const {
6617 assert(_stream != nullptr, "invariant");
6618
6619 return _stream->clone();
6620 }
6621
6622 ReferenceType ClassFileParser::super_reference_type() const {
6623 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6624 }
6625
6626 bool ClassFileParser::is_instance_ref_klass() const {
6627 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6628 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6629 // klass requiring special treatment in ref-processing. The abstract
6630 // j.l.r.Reference cannot be instantiated so doesn't partake in
6631 // ref-processing.
6632 return is_java_lang_ref_Reference_subclass();
6633 }
6634
6635 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6636 if (_super_klass == nullptr) {
6637 return false;
6638 }
6639
6640 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6641 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6642 return true;
6643 }
6644
6645 return _super_klass->reference_type() != REF_NONE;
6646 }
6647
6648 // ----------------------------------------------------------------------------
6649 // debugging
6650
6651 #ifdef ASSERT
6652
6653 // return true if class_name contains no '.' (internal format is '/')
6654 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6655 if (class_name != nullptr) {
6656 ResourceMark rm;
6657 char* name = class_name->as_C_string();
6658 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6659 } else {
6660 return true;
6661 }
6662 }
6663
6664 #endif