1 /*
2 * Copyright (c) 1997, 2024, 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 JAVA_23_VERSION 67
157
158 #define CONSTANT_CLASS_DESCRIPTORS 68
159
160 #define JAVA_24_VERSION 68
161
162 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
163 assert((bad_constant == JVM_CONSTANT_Module ||
164 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
165 "Unexpected bad constant pool entry");
166 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
167 }
168
169 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
170 ConstantPool* cp,
171 const int length,
172 TRAPS) {
173 assert(stream != nullptr, "invariant");
174 assert(cp != nullptr, "invariant");
175
176 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
177 // this function (_current can be allocated in a register, with scalar
178 // replacement of aggregates). The _current pointer is copied back to
179 // stream() when this function returns. DON'T call another method within
180 // this method that uses stream().
181 const ClassFileStream cfs1 = *stream;
182 const ClassFileStream* const cfs = &cfs1;
183
184 debug_only(const u1* const old_current = stream->current();)
185
186 // Used for batching symbol allocations.
187 const char* names[SymbolTable::symbol_alloc_batch_size];
188 int lengths[SymbolTable::symbol_alloc_batch_size];
189 int indices[SymbolTable::symbol_alloc_batch_size];
190 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
191 int names_count = 0;
192
193 // parsing Index 0 is unused
194 for (int index = 1; index < length; index++) {
195 // Each of the following case guarantees one more byte in the stream
196 // for the following tag or the access_flags following constant pool,
197 // so we don't need bounds-check for reading tag.
198 const u1 tag = cfs->get_u1_fast();
199 switch (tag) {
200 case JVM_CONSTANT_Class: {
201 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
202 const u2 name_index = cfs->get_u2_fast();
203 cp->klass_index_at_put(index, name_index);
204 break;
205 }
206 case JVM_CONSTANT_Fieldref: {
207 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
208 const u2 class_index = cfs->get_u2_fast();
209 const u2 name_and_type_index = cfs->get_u2_fast();
210 cp->field_at_put(index, class_index, name_and_type_index);
211 break;
212 }
213 case JVM_CONSTANT_Methodref: {
214 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
215 const u2 class_index = cfs->get_u2_fast();
216 const u2 name_and_type_index = cfs->get_u2_fast();
217 cp->method_at_put(index, class_index, name_and_type_index);
218 break;
219 }
220 case JVM_CONSTANT_InterfaceMethodref: {
221 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
222 const u2 class_index = cfs->get_u2_fast();
223 const u2 name_and_type_index = cfs->get_u2_fast();
224 cp->interface_method_at_put(index, class_index, name_and_type_index);
225 break;
226 }
227 case JVM_CONSTANT_String : {
228 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
229 const u2 string_index = cfs->get_u2_fast();
230 cp->string_index_at_put(index, string_index);
231 break;
232 }
233 case JVM_CONSTANT_MethodHandle :
234 case JVM_CONSTANT_MethodType: {
235 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
236 classfile_parse_error(
237 "Class file version does not support constant tag %u in class file %s",
238 tag, THREAD);
239 return;
240 }
241 if (tag == JVM_CONSTANT_MethodHandle) {
242 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
243 const u1 ref_kind = cfs->get_u1_fast();
244 const u2 method_index = cfs->get_u2_fast();
245 cp->method_handle_index_at_put(index, ref_kind, method_index);
246 }
247 else if (tag == JVM_CONSTANT_MethodType) {
248 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
249 const u2 signature_index = cfs->get_u2_fast();
250 cp->method_type_index_at_put(index, signature_index);
251 }
252 else {
253 ShouldNotReachHere();
254 }
255 break;
256 }
257 case JVM_CONSTANT_Dynamic : {
258 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
259 classfile_parse_error(
260 "Class file version does not support constant tag %u in class file %s",
261 tag, THREAD);
262 return;
263 }
264 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
265 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
266 const u2 name_and_type_index = cfs->get_u2_fast();
267 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
268 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
269 }
270 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
271 break;
272 }
273 case JVM_CONSTANT_InvokeDynamic : {
274 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
275 classfile_parse_error(
276 "Class file version does not support constant tag %u in class file %s",
277 tag, THREAD);
278 return;
279 }
280 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
281 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
282 const u2 name_and_type_index = cfs->get_u2_fast();
283 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
284 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
285 }
286 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
287 break;
288 }
289 case JVM_CONSTANT_Integer: {
290 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
291 const u4 bytes = cfs->get_u4_fast();
292 cp->int_at_put(index, (jint)bytes);
293 break;
294 }
295 case JVM_CONSTANT_Float: {
296 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
297 const u4 bytes = cfs->get_u4_fast();
298 cp->float_at_put(index, *(jfloat*)&bytes);
299 break;
300 }
301 case JVM_CONSTANT_Long: {
302 // A mangled type might cause you to overrun allocated memory
303 guarantee_property(index + 1 < length,
304 "Invalid constant pool entry %u in class file %s",
305 index,
306 CHECK);
307 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
308 const u8 bytes = cfs->get_u8_fast();
309 cp->long_at_put(index, bytes);
310 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
311 break;
312 }
313 case JVM_CONSTANT_Double: {
314 // A mangled type might cause you to overrun allocated memory
315 guarantee_property(index+1 < length,
316 "Invalid constant pool entry %u in class file %s",
317 index,
318 CHECK);
319 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
320 const u8 bytes = cfs->get_u8_fast();
321 cp->double_at_put(index, *(jdouble*)&bytes);
322 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
323 break;
324 }
325 case JVM_CONSTANT_NameAndType: {
326 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
327 const u2 name_index = cfs->get_u2_fast();
328 const u2 signature_index = cfs->get_u2_fast();
329 cp->name_and_type_at_put(index, name_index, signature_index);
330 break;
331 }
332 case JVM_CONSTANT_Utf8 : {
333 cfs->guarantee_more(2, CHECK); // utf8_length
334 u2 utf8_length = cfs->get_u2_fast();
335 const u1* utf8_buffer = cfs->current();
336 assert(utf8_buffer != nullptr, "null utf8 buffer");
337 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
338 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
339 cfs->skip_u1_fast(utf8_length);
340
341 // Before storing the symbol, make sure it's legal
342 if (_need_verify) {
343 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
344 }
345
346 unsigned int hash;
347 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
348 utf8_length,
349 hash);
350 if (result == nullptr) {
351 names[names_count] = (const char*)utf8_buffer;
352 lengths[names_count] = utf8_length;
353 indices[names_count] = index;
354 hashValues[names_count++] = hash;
355 if (names_count == SymbolTable::symbol_alloc_batch_size) {
356 SymbolTable::new_symbols(_loader_data,
357 constantPoolHandle(THREAD, cp),
358 names_count,
359 names,
360 lengths,
361 indices,
362 hashValues);
363 names_count = 0;
364 }
365 } else {
366 cp->symbol_at_put(index, result);
367 }
368 break;
369 }
370 case JVM_CONSTANT_Module:
371 case JVM_CONSTANT_Package: {
372 // Record that an error occurred in these two cases but keep parsing so
373 // that ACC_Module can be checked for in the access_flags. Need to
374 // throw NoClassDefFoundError in that case.
375 if (_major_version >= JAVA_9_VERSION) {
376 cfs->guarantee_more(3, CHECK);
377 cfs->get_u2_fast();
378 set_class_bad_constant_seen(tag);
379 break;
380 }
381 }
382 default: {
383 classfile_parse_error("Unknown constant tag %u in class file %s",
384 tag,
385 THREAD);
386 return;
387 }
388 } // end of switch(tag)
389 } // end of for
390
391 // Allocate the remaining symbols
392 if (names_count > 0) {
393 SymbolTable::new_symbols(_loader_data,
394 constantPoolHandle(THREAD, cp),
395 names_count,
396 names,
397 lengths,
398 indices,
399 hashValues);
400 }
401
402 // Copy _current pointer of local copy back to stream.
403 assert(stream->current() == old_current, "non-exclusive use of stream");
404 stream->set_current(cfs1.current());
405
406 }
407
408 static inline bool valid_cp_range(int index, int length) {
409 return (index > 0 && index < length);
410 }
411
412 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
413 assert(cp != nullptr, "invariant");
414 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
415 return cp->symbol_at(index);
416 }
417 return nullptr;
418 }
419
420 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
421 ConstantPool* const cp,
422 const int length,
423 TRAPS) {
424 assert(cp != nullptr, "invariant");
425 assert(stream != nullptr, "invariant");
426
427 // parsing constant pool entries
428 parse_constant_pool_entries(stream, cp, length, CHECK);
429 if (class_bad_constant_seen() != 0) {
430 // a bad CP entry has been detected previously so stop parsing and just return.
431 return;
432 }
433
434 int index = 1; // declared outside of loops for portability
435 int num_klasses = 0;
436
437 // first verification pass - validate cross references
438 // and fixup class and string constants
439 for (index = 1; index < length; index++) { // Index 0 is unused
440 const jbyte tag = cp->tag_at(index).value();
441 switch (tag) {
442 case JVM_CONSTANT_Class: {
443 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
444 break;
445 }
446 case JVM_CONSTANT_Fieldref:
447 // fall through
448 case JVM_CONSTANT_Methodref:
449 // fall through
450 case JVM_CONSTANT_InterfaceMethodref: {
451 if (!_need_verify) break;
452 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
453 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
454 guarantee_property(valid_klass_reference_at(klass_ref_index),
455 "Invalid constant pool index %u in class file %s",
456 klass_ref_index, CHECK);
457 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
458 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
459 "Invalid constant pool index %u in class file %s",
460 name_and_type_ref_index, CHECK);
461 break;
462 }
463 case JVM_CONSTANT_String: {
464 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
465 break;
466 }
467 case JVM_CONSTANT_Integer:
468 break;
469 case JVM_CONSTANT_Float:
470 break;
471 case JVM_CONSTANT_Long:
472 case JVM_CONSTANT_Double: {
473 index++;
474 guarantee_property(
475 (index < length && cp->tag_at(index).is_invalid()),
476 "Improper constant pool long/double index %u in class file %s",
477 index, CHECK);
478 break;
479 }
480 case JVM_CONSTANT_NameAndType: {
481 if (!_need_verify) break;
482 const int name_ref_index = cp->name_ref_index_at(index);
483 const int signature_ref_index = cp->signature_ref_index_at(index);
484 guarantee_property(valid_symbol_at(name_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 name_ref_index, CHECK);
487 guarantee_property(valid_symbol_at(signature_ref_index),
488 "Invalid constant pool index %u in class file %s",
489 signature_ref_index, CHECK);
490 break;
491 }
492 case JVM_CONSTANT_Utf8:
493 break;
494 case JVM_CONSTANT_UnresolvedClass: // fall-through
495 case JVM_CONSTANT_UnresolvedClassInError: {
496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
497 break;
498 }
499 case JVM_CONSTANT_ClassIndex: {
500 const int class_index = cp->klass_index_at(index);
501 guarantee_property(valid_symbol_at(class_index),
502 "Invalid constant pool index %u in class file %s",
503 class_index, CHECK);
504
505 Symbol* const name = cp->symbol_at(class_index);
506 const unsigned int name_len = name->utf8_length();
507 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
508 break;
509 }
510 case JVM_CONSTANT_StringIndex: {
511 const int string_index = cp->string_index_at(index);
512 guarantee_property(valid_symbol_at(string_index),
513 "Invalid constant pool index %u in class file %s",
514 string_index, CHECK);
515 Symbol* const sym = cp->symbol_at(string_index);
516 cp->unresolved_string_at_put(index, sym);
517 break;
518 }
519 case JVM_CONSTANT_MethodHandle: {
520 const int ref_index = cp->method_handle_index_at(index);
521 guarantee_property(valid_cp_range(ref_index, length),
522 "Invalid constant pool index %u in class file %s",
523 ref_index, CHECK);
524 const constantTag tag = cp->tag_at(ref_index);
525 const int ref_kind = cp->method_handle_ref_kind_at(index);
526
527 switch (ref_kind) {
528 case JVM_REF_getField:
529 case JVM_REF_getStatic:
530 case JVM_REF_putField:
531 case JVM_REF_putStatic: {
532 guarantee_property(
533 tag.is_field(),
534 "Invalid constant pool index %u in class file %s (not a field)",
535 ref_index, CHECK);
536 break;
537 }
538 case JVM_REF_invokeVirtual:
539 case JVM_REF_newInvokeSpecial: {
540 guarantee_property(
541 tag.is_method(),
542 "Invalid constant pool index %u in class file %s (not a method)",
543 ref_index, CHECK);
544 break;
545 }
546 case JVM_REF_invokeStatic:
547 case JVM_REF_invokeSpecial: {
548 guarantee_property(
549 tag.is_method() ||
550 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
551 "Invalid constant pool index %u in class file %s (not a method)",
552 ref_index, CHECK);
553 break;
554 }
555 case JVM_REF_invokeInterface: {
556 guarantee_property(
557 tag.is_interface_method(),
558 "Invalid constant pool index %u in class file %s (not an interface method)",
559 ref_index, CHECK);
560 break;
561 }
562 default: {
563 classfile_parse_error(
564 "Bad method handle kind at constant pool index %u in class file %s",
565 index, THREAD);
566 return;
567 }
568 } // switch(refkind)
569 // Keep the ref_index unchanged. It will be indirected at link-time.
570 break;
571 } // case MethodHandle
572 case JVM_CONSTANT_MethodType: {
573 const int ref_index = cp->method_type_index_at(index);
574 guarantee_property(valid_symbol_at(ref_index),
575 "Invalid constant pool index %u in class file %s",
576 ref_index, CHECK);
577 break;
578 }
579 case JVM_CONSTANT_Dynamic: {
580 const int name_and_type_ref_index =
581 cp->bootstrap_name_and_type_ref_index_at(index);
582
583 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
584 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
585 "Invalid constant pool index %u in class file %s",
586 name_and_type_ref_index, CHECK);
587 // bootstrap specifier index must be checked later,
588 // when BootstrapMethods attr is available
589
590 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
591 cp->set_has_dynamic_constant();
592 break;
593 }
594 case JVM_CONSTANT_InvokeDynamic: {
595 const int name_and_type_ref_index =
596 cp->bootstrap_name_and_type_ref_index_at(index);
597
598 guarantee_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 break;
605 }
606 default: {
607 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
608 ShouldNotReachHere();
609 break;
610 }
611 } // switch(tag)
612 } // end of for
613
614 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
615
616 if (!_need_verify) {
617 return;
618 }
619
620 // second verification pass - checks the strings are of the right format.
621 // but not yet to the other entries
622 for (index = 1; index < length; index++) {
623 const jbyte tag = cp->tag_at(index).value();
624 switch (tag) {
625 case JVM_CONSTANT_UnresolvedClass: {
626 const Symbol* const class_name = cp->klass_name_at(index);
627 // check the name
628 verify_legal_class_name(class_name, CHECK);
629 break;
630 }
631 case JVM_CONSTANT_NameAndType: {
632 if (_need_verify) {
633 const int sig_index = cp->signature_ref_index_at(index);
634 const int name_index = cp->name_ref_index_at(index);
635 const Symbol* const name = cp->symbol_at(name_index);
636 const Symbol* const sig = cp->symbol_at(sig_index);
637 guarantee_property(sig->utf8_length() != 0,
638 "Illegal zero length constant pool entry at %d in class %s",
639 sig_index, CHECK);
640 guarantee_property(name->utf8_length() != 0,
641 "Illegal zero length constant pool entry at %d in class %s",
642 name_index, CHECK);
643
644 if (Signature::is_method(sig)) {
645 // Format check method name and signature
646 verify_legal_method_name(name, CHECK);
647 verify_legal_method_signature(name, sig, CHECK);
648 } else {
649 // Format check field name and signature
650 verify_legal_field_name(name, CHECK);
651 verify_legal_field_signature(name, sig, CHECK);
652 }
653 }
654 break;
655 }
656 case JVM_CONSTANT_Dynamic: {
657 const int name_and_type_ref_index =
658 cp->uncached_name_and_type_ref_index_at(index);
659 // already verified to be utf8
660 const int name_ref_index =
661 cp->name_ref_index_at(name_and_type_ref_index);
662 // already verified to be utf8
663 const int signature_ref_index =
664 cp->signature_ref_index_at(name_and_type_ref_index);
665 const Symbol* const name = cp->symbol_at(name_ref_index);
666 const Symbol* const signature = cp->symbol_at(signature_ref_index);
667 if (_need_verify) {
668 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
669 // Need only to be sure signature is the right type.
670 if (Signature::is_method(signature)) {
671 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
672 }
673 }
674 break;
675 }
676 case JVM_CONSTANT_InvokeDynamic:
677 case JVM_CONSTANT_Fieldref:
678 case JVM_CONSTANT_Methodref:
679 case JVM_CONSTANT_InterfaceMethodref: {
680 const int name_and_type_ref_index =
681 cp->uncached_name_and_type_ref_index_at(index);
682 // already verified to be utf8
683 const int name_ref_index =
684 cp->name_ref_index_at(name_and_type_ref_index);
685 // already verified to be utf8
686 const int signature_ref_index =
687 cp->signature_ref_index_at(name_and_type_ref_index);
688 const Symbol* const name = cp->symbol_at(name_ref_index);
689 const Symbol* const signature = cp->symbol_at(signature_ref_index);
690 if (tag == JVM_CONSTANT_Fieldref) {
691 if (_need_verify) {
692 // Field name and signature are verified above, when iterating NameAndType_info.
693 // Need only to be sure signature is non-zero length and the right type.
694 if (Signature::is_method(signature)) {
695 throwIllegalSignature("Field", name, signature, CHECK);
696 }
697 }
698 } else {
699 if (_need_verify) {
700 // Method name and signature are individually verified above, when iterating
701 // NameAndType_info. Need to check here that signature is non-zero length and
702 // the right type.
703 if (!Signature::is_method(signature)) {
704 throwIllegalSignature("Method", name, signature, CHECK);
705 }
706 }
707 // If a class method name begins with '<', it must be "<init>" and have void signature.
708 const unsigned int name_len = name->utf8_length();
709 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
710 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
711 if (name != vmSymbols::object_initializer_name()) {
712 classfile_parse_error(
713 "Bad method name at constant pool index %u in class file %s",
714 name_ref_index, THREAD);
715 return;
716 } else if (!Signature::is_void_method(signature)) { // must have void signature.
717 throwIllegalSignature("Method", name, signature, CHECK);
718 }
719 }
720 }
721 break;
722 }
723 case JVM_CONSTANT_MethodHandle: {
724 const int ref_index = cp->method_handle_index_at(index);
725 const int ref_kind = cp->method_handle_ref_kind_at(index);
726 switch (ref_kind) {
727 case JVM_REF_invokeVirtual:
728 case JVM_REF_invokeStatic:
729 case JVM_REF_invokeSpecial:
730 case JVM_REF_newInvokeSpecial: {
731 const int name_and_type_ref_index =
732 cp->uncached_name_and_type_ref_index_at(ref_index);
733 const int name_ref_index =
734 cp->name_ref_index_at(name_and_type_ref_index);
735 const Symbol* const name = cp->symbol_at(name_ref_index);
736
737 if (name != vmSymbols::object_initializer_name()) { // !<init>
738 if (ref_kind == JVM_REF_newInvokeSpecial) {
739 classfile_parse_error(
740 "Bad constructor name at constant pool index %u in class file %s",
741 name_ref_index, THREAD);
742 return;
743 }
744 } else { // <init>
745 // The allowed invocation mode of <init> depends on its signature.
746 // This test corresponds to verify_invoke_instructions in the verifier.
747 const int signature_ref_index =
748 cp->signature_ref_index_at(name_and_type_ref_index);
749 const Symbol* const signature = cp->symbol_at(signature_ref_index);
750 if (signature->is_void_method_signature()
751 && ref_kind == JVM_REF_newInvokeSpecial) {
752 // OK, could be a constructor call
753 } else {
754 classfile_parse_error(
755 "Bad method name at constant pool index %u in class file %s",
756 name_ref_index, THREAD);
757 return;
758 }
759 }
760 break;
761 }
762 // Other ref_kinds are already fully checked in previous pass.
763 } // switch(ref_kind)
764 break;
765 }
766 case JVM_CONSTANT_MethodType: {
767 const Symbol* const no_name = vmSymbols::type_name(); // place holder
768 const Symbol* const signature = cp->method_type_signature_at(index);
769 verify_legal_method_signature(no_name, signature, CHECK);
770 break;
771 }
772 case JVM_CONSTANT_Utf8: {
773 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
774 }
775 } // switch(tag)
776 } // end of for
777 }
778
779 class NameSigHash: public ResourceObj {
780 public:
781 const Symbol* _name; // name
782 const Symbol* _sig; // signature
783
784 static const int HASH_ROW_SIZE = 256;
785
786 NameSigHash(Symbol* name, Symbol* sig) :
787 _name(name),
788 _sig(sig) {}
789
790 static unsigned int hash(NameSigHash const& namesig) {
791 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
792 }
793
794 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
795 return (e0._name == e1._name) &&
796 (e0._sig == e1._sig);
797 }
798 };
799
800 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
801 NameSigHash::HASH_ROW_SIZE,
802 AnyObj::RESOURCE_AREA, mtInternal,
803 &NameSigHash::hash, &NameSigHash::equals>;
804
805 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
806 assert(super_type != nullptr,"Method doesn't support null super type");
807 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
808 && super_type->name() != vmSymbols::java_lang_Object()) {
809 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
810 err_msg("Value type %s has an identity type as supertype",
811 current->class_name()->as_klass_external_name()));
812 }
813 }
814
815 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
816 int itfs_len,
817 ConstantPool* cp,
818 bool* const has_nonstatic_concrete_methods,
819 // FIXME: lots of these functions
820 // declare their parameters as const,
821 // which adds only noise to the code.
822 // Remove the spurious const modifiers.
823 // Many are of the form "const int x"
824 // or "T* const x".
825 TRAPS) {
826 assert(stream != nullptr, "invariant");
827 assert(cp != nullptr, "invariant");
828 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
829
830 if (itfs_len == 0) {
831 _local_interfaces = Universe::the_empty_instance_klass_array();
832
833 } else {
834 assert(itfs_len > 0, "only called for len>0");
835 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
836 int index = 0;
837 for (index = 0; index < itfs_len; index++) {
838 const u2 interface_index = stream->get_u2(CHECK);
839 guarantee_property(
840 valid_klass_reference_at(interface_index),
841 "Interface name has bad constant pool index %u in class file %s",
842 interface_index, CHECK);
843 _local_interface_indexes->at_put_grow(index, interface_index);
844 }
845
846 if (!_need_verify || itfs_len <= 1) {
847 return;
848 }
849
850 // Check if there's any duplicates in interfaces
851 ResourceMark rm(THREAD);
852 // Set containing interface names
853 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
854 for (index = 0; index < itfs_len; index++) {
855 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
856 // If no duplicates, add (name, nullptr) in hashtable interface_names.
857 if (!interface_names->put(interface_name, 0)) {
858 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
859 interface_name->as_C_string(), THREAD);
860 return;
861 }
862 }
863 }
864 }
865
866 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
867 int constantvalue_index,
868 int signature_index,
869 TRAPS) const {
870 // Make sure the constant pool entry is of a type appropriate to this field
871 guarantee_property(
872 (constantvalue_index > 0 &&
873 constantvalue_index < cp->length()),
874 "Bad initial value index %u in ConstantValue attribute in class file %s",
875 constantvalue_index, CHECK);
876
877 const constantTag value_type = cp->tag_at(constantvalue_index);
878 switch(cp->basic_type_for_signature_at(signature_index)) {
879 case T_LONG: {
880 guarantee_property(value_type.is_long(),
881 "Inconsistent constant value type in class file %s",
882 CHECK);
883 break;
884 }
885 case T_FLOAT: {
886 guarantee_property(value_type.is_float(),
887 "Inconsistent constant value type in class file %s",
888 CHECK);
889 break;
890 }
891 case T_DOUBLE: {
892 guarantee_property(value_type.is_double(),
893 "Inconsistent constant value type in class file %s",
894 CHECK);
895 break;
896 }
897 case T_BYTE:
898 case T_CHAR:
899 case T_SHORT:
900 case T_BOOLEAN:
901 case T_INT: {
902 guarantee_property(value_type.is_int(),
903 "Inconsistent constant value type in class file %s",
904 CHECK);
905 break;
906 }
907 case T_OBJECT: {
908 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
909 && value_type.is_string()),
910 "Bad string initial value in class file %s",
911 CHECK);
912 break;
913 }
914 default: {
915 classfile_parse_error("Unable to set initial value %u in class file %s",
916 constantvalue_index,
917 THREAD);
918 }
919 }
920 }
921
922 class AnnotationCollector : public ResourceObj{
923 public:
924 enum Location { _in_field, _in_method, _in_class };
925 enum ID {
926 _unknown = 0,
927 _method_CallerSensitive,
928 _method_ForceInline,
929 _method_DontInline,
930 _method_ChangesCurrentThread,
931 _method_JvmtiHideEvents,
932 _method_JvmtiMountTransition,
933 _method_InjectedProfile,
934 _method_LambdaForm_Compiled,
935 _method_Hidden,
936 _method_Scoped,
937 _method_IntrinsicCandidate,
938 _jdk_internal_vm_annotation_Contended,
939 _field_Stable,
940 _jdk_internal_vm_annotation_ReservedStackAccess,
941 _jdk_internal_ValueBased,
942 _jdk_internal_ImplicitlyConstructible,
943 _jdk_internal_LooselyConsistentValue,
944 _jdk_internal_NullRestricted,
945 _java_lang_Deprecated,
946 _java_lang_Deprecated_for_removal,
947 _annotation_LIMIT
948 };
949 const Location _location;
950 int _annotations_present;
951 u2 _contended_group;
952
953 AnnotationCollector(Location location)
954 : _location(location), _annotations_present(0), _contended_group(0)
955 {
956 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
957 }
958 // If this annotation name has an ID, report it (or _none).
959 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
960 // Set the annotation name:
961 void set_annotation(ID id) {
962 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
963 _annotations_present |= (int)nth_bit((int)id);
964 }
965
966 void remove_annotation(ID id) {
967 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
968 _annotations_present &= (int)~nth_bit((int)id);
969 }
970
971 // Report if the annotation is present.
972 bool has_any_annotations() const { return _annotations_present != 0; }
973 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
974
975 void set_contended_group(u2 group) { _contended_group = group; }
976 u2 contended_group() const { return _contended_group; }
977
978 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
979
980 void set_stable(bool stable) { set_annotation(_field_Stable); }
981 bool is_stable() const { return has_annotation(_field_Stable); }
982 };
983
984 // This class also doubles as a holder for metadata cleanup.
985 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
986 private:
987 ClassLoaderData* _loader_data;
988 AnnotationArray* _field_annotations;
989 AnnotationArray* _field_type_annotations;
990 public:
991 FieldAnnotationCollector(ClassLoaderData* loader_data) :
992 AnnotationCollector(_in_field),
993 _loader_data(loader_data),
994 _field_annotations(nullptr),
995 _field_type_annotations(nullptr) {}
996 ~FieldAnnotationCollector();
997 void apply_to(FieldInfo* f);
998 AnnotationArray* field_annotations() { return _field_annotations; }
999 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1000
1001 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1002 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1003 };
1004
1005 class MethodAnnotationCollector : public AnnotationCollector{
1006 public:
1007 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1008 void apply_to(const methodHandle& m);
1009 };
1010
1011 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1012 public:
1013 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1014 void apply_to(InstanceKlass* ik);
1015 };
1016
1017
1018 static int skip_annotation_value(const u1*, int, int); // fwd decl
1019
1020 // Safely increment index by val if does not pass limit
1021 #define SAFE_ADD(index, limit, val) \
1022 if (index >= limit - val) return limit; \
1023 index += val;
1024
1025 // Skip an annotation. Return >=limit if there is any problem.
1026 static int skip_annotation(const u1* buffer, int limit, int index) {
1027 assert(buffer != nullptr, "invariant");
1028 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1029 // value := switch (tag:u1) { ... }
1030 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1031 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1032 while (--nmem >= 0 && index < limit) {
1033 SAFE_ADD(index, limit, 2); // skip member
1034 index = skip_annotation_value(buffer, limit, index);
1035 }
1036 return index;
1037 }
1038
1039 // Skip an annotation value. Return >=limit if there is any problem.
1040 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1041 assert(buffer != nullptr, "invariant");
1042
1043 // value := switch (tag:u1) {
1044 // case B, C, I, S, Z, D, F, J, c: con:u2;
1045 // case e: e_class:u2 e_name:u2;
1046 // case s: s_con:u2;
1047 // case [: do(nval:u2) {value};
1048 // case @: annotation;
1049 // case s: s_con:u2;
1050 // }
1051 SAFE_ADD(index, limit, 1); // read tag
1052 const u1 tag = buffer[index - 1];
1053 switch (tag) {
1054 case 'B':
1055 case 'C':
1056 case 'I':
1057 case 'S':
1058 case 'Z':
1059 case 'D':
1060 case 'F':
1061 case 'J':
1062 case 'c':
1063 case 's':
1064 SAFE_ADD(index, limit, 2); // skip con or s_con
1065 break;
1066 case 'e':
1067 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1068 break;
1069 case '[':
1070 {
1071 SAFE_ADD(index, limit, 2); // read nval
1072 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1073 while (--nval >= 0 && index < limit) {
1074 index = skip_annotation_value(buffer, limit, index);
1075 }
1076 }
1077 break;
1078 case '@':
1079 index = skip_annotation(buffer, limit, index);
1080 break;
1081 default:
1082 return limit; // bad tag byte
1083 }
1084 return index;
1085 }
1086
1087 // Sift through annotations, looking for those significant to the VM:
1088 static void parse_annotations(const ConstantPool* const cp,
1089 const u1* buffer, int limit,
1090 AnnotationCollector* coll,
1091 ClassLoaderData* loader_data,
1092 const bool can_access_vm_annotations) {
1093
1094 assert(cp != nullptr, "invariant");
1095 assert(buffer != nullptr, "invariant");
1096 assert(coll != nullptr, "invariant");
1097 assert(loader_data != nullptr, "invariant");
1098
1099 // annotations := do(nann:u2) {annotation}
1100 int index = 2; // read nann
1101 if (index >= limit) return;
1102 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1103 enum { // initial annotation layout
1104 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1105 count_off = 2, // u2 such as 1 (one value)
1106 member_off = 4, // utf8 such as 'value'
1107 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1108 e_tag_val = 'e',
1109 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1110 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1111 e_size = 11, // end of 'e' annotation
1112 c_tag_val = 'c', // payload is type
1113 c_con_off = 7, // utf8 payload, such as 'I'
1114 c_size = 9, // end of 'c' annotation
1115 s_tag_val = 's', // payload is String
1116 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1117 s_size = 9,
1118 b_tag_val = 'Z', // payload is boolean
1119 min_size = 6 // smallest possible size (zero members)
1120 };
1121 // Cannot add min_size to index in case of overflow MAX_INT
1122 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1123 int index0 = index;
1124 index = skip_annotation(buffer, limit, index);
1125 const u1* const abase = buffer + index0;
1126 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1127 const int count = Bytes::get_Java_u2((address)abase + count_off);
1128 const Symbol* const aname = check_symbol_at(cp, atype);
1129 if (aname == nullptr) break; // invalid annotation name
1130 const Symbol* member = nullptr;
1131 if (count >= 1) {
1132 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1133 member = check_symbol_at(cp, member_index);
1134 if (member == nullptr) break; // invalid member name
1135 }
1136
1137 // Here is where parsing particular annotations will take place.
1138 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1139 if (AnnotationCollector::_unknown == id) continue;
1140 coll->set_annotation(id);
1141 if (AnnotationCollector::_java_lang_Deprecated == id) {
1142 // @Deprecated can specify forRemoval=true, which we need
1143 // to record for JFR to use. If the annotation is not well-formed
1144 // then we may not be able to determine that.
1145 const u1* offset = abase + member_off;
1146 // There are only 2 members in @Deprecated.
1147 int n_members = MIN2(count, 2);
1148 for (int i = 0; i < n_members; ++i) {
1149 int member_index = Bytes::get_Java_u2((address)offset);
1150 offset += 2;
1151 member = check_symbol_at(cp, member_index);
1152 if (member == vmSymbols::since() &&
1153 (*((address)offset) == s_tag_val)) {
1154 // Found `since` first so skip over it
1155 offset += 3;
1156 }
1157 else if (member == vmSymbols::for_removal() &&
1158 (*((address)offset) == b_tag_val)) {
1159 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1160 // No guarantee the entry is valid so check it refers to an int in the CP.
1161 if (cp->is_within_bounds(boolean_value_index) &&
1162 cp->tag_at(boolean_value_index).is_int() &&
1163 cp->int_at(boolean_value_index) == 1) {
1164 // forRemoval == true
1165 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1166 }
1167 break; // no need to check further
1168 }
1169 else {
1170 // This @Deprecated annotation is malformed so we don't try to
1171 // determine whether forRemoval is set.
1172 break;
1173 }
1174 }
1175 continue; // proceed to next annotation
1176 }
1177
1178 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1179 // @Contended can optionally specify the contention group.
1180 //
1181 // Contended group defines the equivalence class over the fields:
1182 // the fields within the same contended group are not treated distinct.
1183 // The only exception is default group, which does not incur the
1184 // equivalence. Naturally, contention group for classes is meaningless.
1185 //
1186 // While the contention group is specified as String, annotation
1187 // values are already interned, and we might as well use the constant
1188 // pool index as the group tag.
1189 //
1190 u2 group_index = 0; // default contended group
1191 if (count == 1
1192 && s_size == (index - index0) // match size
1193 && s_tag_val == *(abase + tag_off)
1194 && member == vmSymbols::value_name()) {
1195 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1196 // No guarantee the group_index is valid so check it refers to a
1197 // symbol in the CP.
1198 if (cp->is_within_bounds(group_index) &&
1199 cp->tag_at(group_index).is_utf8()) {
1200 // Seems valid, so check for empty string and reset
1201 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1202 group_index = 0; // default contended group
1203 }
1204 } else {
1205 // Not valid so use the default
1206 group_index = 0;
1207 }
1208 }
1209 coll->set_contended_group(group_index);
1210 continue; // proceed to next annotation
1211 }
1212 }
1213 }
1214
1215
1216 // Parse attributes for a field.
1217 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1218 u2 attributes_count,
1219 bool is_static, u2 signature_index,
1220 u2* const constantvalue_index_addr,
1221 bool* const is_synthetic_addr,
1222 u2* const generic_signature_index_addr,
1223 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1224 TRAPS) {
1225 assert(cfs != nullptr, "invariant");
1226 assert(constantvalue_index_addr != nullptr, "invariant");
1227 assert(is_synthetic_addr != nullptr, "invariant");
1228 assert(generic_signature_index_addr != nullptr, "invariant");
1229 assert(parsed_annotations != nullptr, "invariant");
1230 assert(attributes_count > 0, "attributes_count should be greater than 0");
1231
1232 u2 constantvalue_index = 0;
1233 u2 generic_signature_index = 0;
1234 bool is_synthetic = false;
1235 const u1* runtime_visible_annotations = nullptr;
1236 int runtime_visible_annotations_length = 0;
1237 const u1* runtime_visible_type_annotations = nullptr;
1238 int runtime_visible_type_annotations_length = 0;
1239 bool runtime_invisible_annotations_exists = false;
1240 bool runtime_invisible_type_annotations_exists = false;
1241 const ConstantPool* const cp = _cp;
1242
1243 while (attributes_count--) {
1244 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1245 const u2 attribute_name_index = cfs->get_u2_fast();
1246 const u4 attribute_length = cfs->get_u4_fast();
1247 guarantee_property(valid_symbol_at(attribute_name_index),
1248 "Invalid field attribute index %u in class file %s",
1249 attribute_name_index,
1250 CHECK);
1251
1252 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1253 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1254 // ignore if non-static
1255 if (constantvalue_index != 0) {
1256 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1257 return;
1258 }
1259 guarantee_property(
1260 attribute_length == 2,
1261 "Invalid ConstantValue field attribute length %u in class file %s",
1262 attribute_length, CHECK);
1263
1264 constantvalue_index = cfs->get_u2(CHECK);
1265 if (_need_verify) {
1266 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1267 }
1268 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1269 if (attribute_length != 0) {
1270 classfile_parse_error(
1271 "Invalid Synthetic field attribute length %u in class file %s",
1272 attribute_length, THREAD);
1273 return;
1274 }
1275 is_synthetic = true;
1276 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1277 if (attribute_length != 0) {
1278 classfile_parse_error(
1279 "Invalid Deprecated field attribute length %u in class file %s",
1280 attribute_length, THREAD);
1281 return;
1282 }
1283 } else if (_major_version >= JAVA_1_5_VERSION) {
1284 if (attribute_name == vmSymbols::tag_signature()) {
1285 if (generic_signature_index != 0) {
1286 classfile_parse_error(
1287 "Multiple Signature attributes for field in class file %s", THREAD);
1288 return;
1289 }
1290 if (attribute_length != 2) {
1291 classfile_parse_error(
1292 "Wrong size %u for field's Signature attribute in class file %s",
1293 attribute_length, THREAD);
1294 return;
1295 }
1296 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1297 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1298 if (runtime_visible_annotations != nullptr) {
1299 classfile_parse_error(
1300 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1301 return;
1302 }
1303 runtime_visible_annotations_length = attribute_length;
1304 runtime_visible_annotations = cfs->current();
1305 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1306 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1307 parse_annotations(cp,
1308 runtime_visible_annotations,
1309 runtime_visible_annotations_length,
1310 parsed_annotations,
1311 _loader_data,
1312 _can_access_vm_annotations);
1313 cfs->skip_u1_fast(runtime_visible_annotations_length);
1314 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1315 if (runtime_invisible_annotations_exists) {
1316 classfile_parse_error(
1317 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1318 return;
1319 }
1320 runtime_invisible_annotations_exists = true;
1321 cfs->skip_u1(attribute_length, CHECK);
1322 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1323 if (runtime_visible_type_annotations != nullptr) {
1324 classfile_parse_error(
1325 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1326 return;
1327 }
1328 runtime_visible_type_annotations_length = attribute_length;
1329 runtime_visible_type_annotations = cfs->current();
1330 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1331 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1332 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1333 if (runtime_invisible_type_annotations_exists) {
1334 classfile_parse_error(
1335 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1336 return;
1337 } else {
1338 runtime_invisible_type_annotations_exists = true;
1339 }
1340 cfs->skip_u1(attribute_length, CHECK);
1341 } else {
1342 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1343 }
1344 } else {
1345 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1346 }
1347 }
1348
1349 *constantvalue_index_addr = constantvalue_index;
1350 *is_synthetic_addr = is_synthetic;
1351 *generic_signature_index_addr = generic_signature_index;
1352 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1353 runtime_visible_annotations_length,
1354 CHECK);
1355 parsed_annotations->set_field_annotations(a);
1356 a = allocate_annotations(runtime_visible_type_annotations,
1357 runtime_visible_type_annotations_length,
1358 CHECK);
1359 parsed_annotations->set_field_type_annotations(a);
1360 return;
1361 }
1362
1363
1364 // Side-effects: populates the _fields, _fields_annotations,
1365 // _fields_type_annotations fields
1366 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1367 AccessFlags class_access_flags,
1368 ConstantPool* cp,
1369 const int cp_size,
1370 u2* const java_fields_count_ptr,
1371 TRAPS) {
1372
1373 assert(cfs != nullptr, "invariant");
1374 assert(cp != nullptr, "invariant");
1375 assert(java_fields_count_ptr != nullptr, "invariant");
1376
1377 assert(nullptr == _fields_annotations, "invariant");
1378 assert(nullptr == _fields_type_annotations, "invariant");
1379
1380 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1381 cfs->guarantee_more(2, CHECK); // length
1382 const u2 length = cfs->get_u2_fast();
1383 *java_fields_count_ptr = length;
1384
1385 int num_injected = 0;
1386 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1387 &num_injected);
1388
1389 // two more slots are required for inline classes:
1390 // one for the static field with a reference to the pre-allocated default value
1391 // one for the field the JVM injects when detecting an empty inline class
1392 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1393
1394 // Allocate a temporary resource array to collect field data.
1395 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1396 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1397
1398 int instance_fields_count = 0;
1399 ResourceMark rm(THREAD);
1400 for (int n = 0; n < length; n++) {
1401 // access_flags, name_index, descriptor_index, attributes_count
1402 cfs->guarantee_more(8, CHECK);
1403
1404 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1405 if (!supports_inline_types()) {
1406 recognized_modifiers &= ~JVM_ACC_STRICT;
1407 }
1408
1409 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1410 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1411 AccessFlags access_flags;
1412 access_flags.set_flags(flags);
1413 FieldInfo::FieldFlags fieldFlags(0);
1414
1415 const u2 name_index = cfs->get_u2_fast();
1416 guarantee_property(valid_symbol_at(name_index),
1417 "Invalid constant pool index %u for field name in class file %s",
1418 name_index, CHECK);
1419 const Symbol* const name = cp->symbol_at(name_index);
1420 verify_legal_field_name(name, CHECK);
1421
1422 const u2 signature_index = cfs->get_u2_fast();
1423 guarantee_property(valid_symbol_at(signature_index),
1424 "Invalid constant pool index %u for field signature in class file %s",
1425 signature_index, CHECK);
1426 const Symbol* const sig = cp->symbol_at(signature_index);
1427 verify_legal_field_signature(name, sig, CHECK);
1428 if (!access_flags.is_static()) instance_fields_count++;
1429
1430 u2 constantvalue_index = 0;
1431 bool is_synthetic = false;
1432 u2 generic_signature_index = 0;
1433 const bool is_static = access_flags.is_static();
1434 FieldAnnotationCollector parsed_annotations(_loader_data);
1435
1436 bool is_null_restricted = false;
1437
1438 const u2 attributes_count = cfs->get_u2_fast();
1439 if (attributes_count > 0) {
1440 parse_field_attributes(cfs,
1441 attributes_count,
1442 is_static,
1443 signature_index,
1444 &constantvalue_index,
1445 &is_synthetic,
1446 &generic_signature_index,
1447 &parsed_annotations,
1448 CHECK);
1449
1450 if (parsed_annotations.field_annotations() != nullptr) {
1451 if (_fields_annotations == nullptr) {
1452 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1453 _loader_data, length, nullptr,
1454 CHECK);
1455 }
1456 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1457 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1458 if (!Signature::has_envelope(sig)) {
1459 Exceptions::fthrow(
1460 THREAD_AND_LOCATION,
1461 vmSymbols::java_lang_ClassFormatError(),
1462 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s with signature %s (primitive types can never be null)",
1463 name->as_C_string(), sig->as_C_string());
1464 }
1465 is_null_restricted = true;
1466 }
1467 parsed_annotations.set_field_annotations(nullptr);
1468 }
1469 if (parsed_annotations.field_type_annotations() != nullptr) {
1470 if (_fields_type_annotations == nullptr) {
1471 _fields_type_annotations =
1472 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1473 length,
1474 nullptr,
1475 CHECK);
1476 }
1477 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1478 parsed_annotations.set_field_type_annotations(nullptr);
1479 }
1480
1481 if (is_synthetic) {
1482 access_flags.set_is_synthetic();
1483 }
1484 if (generic_signature_index != 0) {
1485 fieldFlags.update_generic(true);
1486 }
1487 }
1488
1489 if (is_null_restricted) {
1490 fieldFlags.update_null_free_inline_type(true);
1491 }
1492
1493 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1494
1495 // Update number of static oop fields.
1496 if (is_static && is_reference_type(type)) {
1497 _static_oop_count++;
1498 }
1499
1500 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1501 fi.set_index(n);
1502 if (fieldFlags.is_generic()) {
1503 fi.set_generic_signature_index(generic_signature_index);
1504 }
1505 parsed_annotations.apply_to(&fi);
1506 if (fi.field_flags().is_contended()) {
1507 _has_contended_fields = true;
1508 }
1509 _temp_field_info->append(fi);
1510 }
1511 assert(_temp_field_info->length() == length, "Must be");
1512
1513 if (num_injected != 0) {
1514 for (int n = 0; n < num_injected; n++) {
1515 // Check for duplicates
1516 if (injected[n].may_be_java) {
1517 const Symbol* const name = injected[n].name();
1518 const Symbol* const signature = injected[n].signature();
1519 bool duplicate = false;
1520 for (int i = 0; i < length; i++) {
1521 const FieldInfo* const f = _temp_field_info->adr_at(i);
1522 if (name == cp->symbol_at(f->name_index()) &&
1523 signature == cp->symbol_at(f->signature_index())) {
1524 // Symbol is desclared in Java so skip this one
1525 duplicate = true;
1526 break;
1527 }
1528 }
1529 if (duplicate) {
1530 // These will be removed from the field array at the end
1531 continue;
1532 }
1533 }
1534
1535 // Injected field
1536 FieldInfo::FieldFlags fflags(0);
1537 fflags.update_injected(true);
1538 AccessFlags aflags;
1539 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1540 int idx = _temp_field_info->append(fi);
1541 _temp_field_info->adr_at(idx)->set_index(idx);
1542 }
1543 }
1544
1545 if (is_inline_type) {
1546 // Inject static ".default" field
1547 FieldInfo::FieldFlags fflags(0);
1548 fflags.update_injected(true);
1549 AccessFlags aflags(JVM_ACC_STATIC);
1550 FieldInfo fi(aflags,
1551 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1552 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1553 0,
1554 fflags);
1555 int idx = _temp_field_info->append(fi);
1556 _temp_field_info->adr_at(idx)->set_index(idx);
1557 _static_oop_count++;
1558 // Inject static ".null_reset" field. This is the same as the .default field but will never have its null-channel set to non-zero.
1559 FieldInfo::FieldFlags fflags2(0);
1560 fflags2.update_injected(true);
1561 AccessFlags aflags2(JVM_ACC_STATIC);
1562 FieldInfo fi2(aflags2,
1563 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1564 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1565 0,
1566 fflags2);
1567 int idx2 = _temp_field_info->append(fi2);
1568 _temp_field_info->adr_at(idx2)->set_index(idx2);
1569 _static_oop_count++;
1570 }
1571
1572 if (_need_verify && length > 1) {
1573 // Check duplicated fields
1574 ResourceMark rm(THREAD);
1575 // Set containing name-signature pairs
1576 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1577 for (int i = 0; i < _temp_field_info->length(); i++) {
1578 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1579 _temp_field_info->adr_at(i)->signature(_cp));
1580 // If no duplicates, add name/signature in hashtable names_and_sigs.
1581 if(!names_and_sigs->put(name_and_sig, 0)) {
1582 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1583 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1584 return;
1585 }
1586 }
1587 }
1588 }
1589
1590
1591 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1592 u4 code_length,
1593 u4 exception_table_length,
1594 TRAPS) {
1595 assert(cfs != nullptr, "invariant");
1596
1597 const unsafe_u2* const exception_table_start = cfs->current();
1598 assert(exception_table_start != nullptr, "null exception table");
1599
1600 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1601 // end_pc,
1602 // handler_pc,
1603 // catch_type_index
1604
1605 // Will check legal target after parsing code array in verifier.
1606 if (_need_verify) {
1607 for (unsigned int i = 0; i < exception_table_length; i++) {
1608 const u2 start_pc = cfs->get_u2_fast();
1609 const u2 end_pc = cfs->get_u2_fast();
1610 const u2 handler_pc = cfs->get_u2_fast();
1611 const u2 catch_type_index = cfs->get_u2_fast();
1612 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1613 "Illegal exception table range in class file %s",
1614 CHECK_NULL);
1615 guarantee_property(handler_pc < code_length,
1616 "Illegal exception table handler in class file %s",
1617 CHECK_NULL);
1618 if (catch_type_index != 0) {
1619 guarantee_property(valid_klass_reference_at(catch_type_index),
1620 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1621 }
1622 }
1623 } else {
1624 cfs->skip_u2_fast(exception_table_length * 4);
1625 }
1626 return exception_table_start;
1627 }
1628
1629 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1630 u4 code_length,
1631 CompressedLineNumberWriteStream**const write_stream,
1632 TRAPS) {
1633
1634 const ClassFileStream* const cfs = _stream;
1635 unsigned int num_entries = cfs->get_u2(CHECK);
1636
1637 // Each entry is a u2 start_pc, and a u2 line_number
1638 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1639
1640 // Verify line number attribute and table length
1641 guarantee_property(
1642 code_attribute_length == sizeof(u2) + length_in_bytes,
1643 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1644
1645 cfs->guarantee_more(length_in_bytes, CHECK);
1646
1647 if ((*write_stream) == nullptr) {
1648 if (length_in_bytes > fixed_buffer_size) {
1649 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1650 } else {
1651 (*write_stream) = new CompressedLineNumberWriteStream(
1652 _linenumbertable_buffer, fixed_buffer_size);
1653 }
1654 }
1655
1656 while (num_entries-- > 0) {
1657 const u2 bci = cfs->get_u2_fast(); // start_pc
1658 const u2 line = cfs->get_u2_fast(); // line_number
1659 guarantee_property(bci < code_length,
1660 "Invalid pc in LineNumberTable in class file %s", CHECK);
1661 (*write_stream)->write_pair(bci, line);
1662 }
1663 }
1664
1665
1666 class LVT_Hash : public AllStatic {
1667 public:
1668
1669 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1670 /*
1671 * 3-tuple start_bci/length/slot has to be unique key,
1672 * so the following comparison seems to be redundant:
1673 * && elem->name_cp_index == entry->_elem->name_cp_index
1674 */
1675 return (e0.start_bci == e1.start_bci &&
1676 e0.length == e1.length &&
1677 e0.name_cp_index == e1.name_cp_index &&
1678 e0.slot == e1.slot);
1679 }
1680
1681 static unsigned int hash(LocalVariableTableElement const& e0) {
1682 unsigned int raw_hash = e0.start_bci;
1683
1684 raw_hash = e0.length + raw_hash * 37;
1685 raw_hash = e0.name_cp_index + raw_hash * 37;
1686 raw_hash = e0.slot + raw_hash * 37;
1687
1688 return raw_hash;
1689 }
1690 };
1691
1692
1693 // Class file LocalVariableTable elements.
1694 class Classfile_LVT_Element {
1695 public:
1696 u2 start_bci;
1697 u2 length;
1698 u2 name_cp_index;
1699 u2 descriptor_cp_index;
1700 u2 slot;
1701 };
1702
1703 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1704 LocalVariableTableElement* const lvt) {
1705 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1706 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1707 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1708 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1709 lvt->signature_cp_index = 0;
1710 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1711 }
1712
1713 // Function is used to parse both attributes:
1714 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1715 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1716 u4 code_length,
1717 u2 max_locals,
1718 u4 code_attribute_length,
1719 u2* const localvariable_table_length,
1720 bool isLVTT,
1721 TRAPS) {
1722 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1723 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1724 const unsigned int size = checked_cast<unsigned>(
1725 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1726
1727 const ConstantPool* const cp = _cp;
1728
1729 // Verify local variable table attribute has right length
1730 if (_need_verify) {
1731 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1732 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1733 }
1734
1735 const unsafe_u2* const localvariable_table_start = cfs->current();
1736 assert(localvariable_table_start != nullptr, "null local variable table");
1737 if (!_need_verify) {
1738 cfs->skip_u2_fast(size);
1739 } else {
1740 cfs->guarantee_more(size * 2, CHECK_NULL);
1741 for(int i = 0; i < (*localvariable_table_length); i++) {
1742 const u2 start_pc = cfs->get_u2_fast();
1743 const u2 length = cfs->get_u2_fast();
1744 const u2 name_index = cfs->get_u2_fast();
1745 const u2 descriptor_index = cfs->get_u2_fast();
1746 const u2 index = cfs->get_u2_fast();
1747 // Assign to a u4 to avoid overflow
1748 const u4 end_pc = (u4)start_pc + (u4)length;
1749
1750 if (start_pc >= code_length) {
1751 classfile_parse_error(
1752 "Invalid start_pc %u in %s in class file %s",
1753 start_pc, tbl_name, THREAD);
1754 return nullptr;
1755 }
1756 if (end_pc > code_length) {
1757 classfile_parse_error(
1758 "Invalid length %u in %s in class file %s",
1759 length, tbl_name, THREAD);
1760 return nullptr;
1761 }
1762 const int cp_size = cp->length();
1763 guarantee_property(valid_symbol_at(name_index),
1764 "Name index %u in %s has bad constant type in class file %s",
1765 name_index, tbl_name, CHECK_NULL);
1766 guarantee_property(valid_symbol_at(descriptor_index),
1767 "Signature index %u in %s has bad constant type in class file %s",
1768 descriptor_index, tbl_name, CHECK_NULL);
1769
1770 const Symbol* const name = cp->symbol_at(name_index);
1771 const Symbol* const sig = cp->symbol_at(descriptor_index);
1772 verify_legal_field_name(name, CHECK_NULL);
1773 u2 extra_slot = 0;
1774 if (!isLVTT) {
1775 verify_legal_field_signature(name, sig, CHECK_NULL);
1776
1777 // 4894874: check special cases for double and long local variables
1778 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1779 sig == vmSymbols::type_signature(T_LONG)) {
1780 extra_slot = 1;
1781 }
1782 }
1783 guarantee_property((index + extra_slot) < max_locals,
1784 "Invalid index %u in %s in class file %s",
1785 index, tbl_name, CHECK_NULL);
1786 }
1787 }
1788 return localvariable_table_start;
1789 }
1790
1791 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1792 u4 code_attribute_length,
1793 TRAPS) {
1794 assert(cfs != nullptr, "invariant");
1795
1796 if (0 == code_attribute_length) {
1797 return nullptr;
1798 }
1799
1800 const u1* const stackmap_table_start = cfs->current();
1801 assert(stackmap_table_start != nullptr, "null stackmap table");
1802
1803 // check code_attribute_length
1804 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1805
1806 return stackmap_table_start;
1807 }
1808
1809 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1810 u2* const checked_exceptions_length,
1811 u4 method_attribute_length,
1812 TRAPS) {
1813 assert(cfs != nullptr, "invariant");
1814 assert(checked_exceptions_length != nullptr, "invariant");
1815
1816 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1817 *checked_exceptions_length = cfs->get_u2_fast();
1818 const unsigned int size =
1819 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1820 const unsafe_u2* const checked_exceptions_start = cfs->current();
1821 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1822 if (!_need_verify) {
1823 cfs->skip_u2_fast(size);
1824 } else {
1825 // Verify each value in the checked exception table
1826 u2 checked_exception;
1827 const u2 len = *checked_exceptions_length;
1828 cfs->guarantee_more(2 * len, CHECK_NULL);
1829 for (int i = 0; i < len; i++) {
1830 checked_exception = cfs->get_u2_fast();
1831 guarantee_property(
1832 valid_klass_reference_at(checked_exception),
1833 "Exception name has bad type at constant pool %u in class file %s",
1834 checked_exception, CHECK_NULL);
1835 }
1836 }
1837 // check exceptions attribute length
1838 if (_need_verify) {
1839 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1840 sizeof(u2) * size),
1841 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1842 }
1843 return checked_exceptions_start;
1844 }
1845
1846 void ClassFileParser::throwIllegalSignature(const char* type,
1847 const Symbol* name,
1848 const Symbol* sig,
1849 TRAPS) const {
1850 assert(name != nullptr, "invariant");
1851 assert(sig != nullptr, "invariant");
1852
1853 ResourceMark rm(THREAD);
1854 Exceptions::fthrow(THREAD_AND_LOCATION,
1855 vmSymbols::java_lang_ClassFormatError(),
1856 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1857 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1858 }
1859
1860 AnnotationCollector::ID
1861 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1862 const Symbol* name,
1863 const bool can_access_vm_annotations) {
1864 const vmSymbolID sid = vmSymbols::find_sid(name);
1865 // Privileged code can use all annotations. Other code silently drops some.
1866 const bool privileged = loader_data->is_boot_class_loader_data() ||
1867 loader_data->is_platform_class_loader_data() ||
1868 can_access_vm_annotations;
1869 switch (sid) {
1870 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1871 if (_location != _in_method) break; // only allow for methods
1872 if (!privileged) break; // only allow in privileged code
1873 return _method_CallerSensitive;
1874 }
1875 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1876 if (_location != _in_method) break; // only allow for methods
1877 if (!privileged) break; // only allow in privileged code
1878 return _method_ForceInline;
1879 }
1880 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1881 if (_location != _in_method) break; // only allow for methods
1882 if (!privileged) break; // only allow in privileged code
1883 return _method_DontInline;
1884 }
1885 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1886 if (_location != _in_method) break; // only allow for methods
1887 if (!privileged) break; // only allow in privileged code
1888 return _method_ChangesCurrentThread;
1889 }
1890 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1891 if (_location != _in_method) break; // only allow for methods
1892 if (!privileged) break; // only allow in privileged code
1893 return _method_JvmtiHideEvents;
1894 }
1895 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1896 if (_location != _in_method) break; // only allow for methods
1897 if (!privileged) break; // only allow in privileged code
1898 return _method_JvmtiMountTransition;
1899 }
1900 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1901 if (_location != _in_method) break; // only allow for methods
1902 if (!privileged) break; // only allow in privileged code
1903 return _method_InjectedProfile;
1904 }
1905 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1906 if (_location != _in_method) break; // only allow for methods
1907 if (!privileged) break; // only allow in privileged code
1908 return _method_LambdaForm_Compiled;
1909 }
1910 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1911 if (_location != _in_method) break; // only allow for methods
1912 if (!privileged) break; // only allow in privileged code
1913 return _method_Hidden;
1914 }
1915 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1916 if (_location != _in_method) break; // only allow for methods
1917 if (!privileged) break; // only allow in privileged code
1918 return _method_Scoped;
1919 }
1920 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1921 if (_location != _in_method) break; // only allow for methods
1922 if (!privileged) break; // only allow in privileged code
1923 return _method_IntrinsicCandidate;
1924 }
1925 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1926 if (_location != _in_field) break; // only allow for fields
1927 if (!privileged) break; // only allow in privileged code
1928 return _field_Stable;
1929 }
1930 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1931 if (_location != _in_field && _location != _in_class) {
1932 break; // only allow for fields and classes
1933 }
1934 if (!EnableContended || (RestrictContended && !privileged)) {
1935 break; // honor privileges
1936 }
1937 return _jdk_internal_vm_annotation_Contended;
1938 }
1939 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1940 if (_location != _in_method) break; // only allow for methods
1941 if (RestrictReservedStack && !privileged) break; // honor privileges
1942 return _jdk_internal_vm_annotation_ReservedStackAccess;
1943 }
1944 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1945 if (_location != _in_class) break; // only allow for classes
1946 if (!privileged) break; // only allow in privileged code
1947 return _jdk_internal_ValueBased;
1948 }
1949 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ImplicitlyConstructible_signature): {
1950 if (_location != _in_class) break; // only allow for classes
1951 return _jdk_internal_ImplicitlyConstructible;
1952 }
1953 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1954 if (_location != _in_class) break; // only allow for classes
1955 return _jdk_internal_LooselyConsistentValue;
1956 }
1957 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1958 if (_location != _in_field) break; // only allow for fields
1959 return _jdk_internal_NullRestricted;
1960 }
1961 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1962 return _java_lang_Deprecated;
1963 }
1964 default: {
1965 break;
1966 }
1967 }
1968 return AnnotationCollector::_unknown;
1969 }
1970
1971 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1972 if (is_contended())
1973 // Setting the contended group also sets the contended bit in field flags
1974 f->set_contended_group(contended_group());
1975 if (is_stable())
1976 (f->field_flags_addr())->update_stable(true);
1977 }
1978
1979 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1980 // If there's an error deallocate metadata for field annotations
1981 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1982 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1983 }
1984
1985 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1986 if (has_annotation(_method_CallerSensitive))
1987 m->set_caller_sensitive();
1988 if (has_annotation(_method_ForceInline))
1989 m->set_force_inline();
1990 if (has_annotation(_method_DontInline))
1991 m->set_dont_inline();
1992 if (has_annotation(_method_ChangesCurrentThread))
1993 m->set_changes_current_thread();
1994 if (has_annotation(_method_JvmtiHideEvents))
1995 m->set_jvmti_hide_events();
1996 if (has_annotation(_method_JvmtiMountTransition))
1997 m->set_jvmti_mount_transition();
1998 if (has_annotation(_method_InjectedProfile))
1999 m->set_has_injected_profile();
2000 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2001 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2002 if (has_annotation(_method_Hidden))
2003 m->set_is_hidden();
2004 if (has_annotation(_method_Scoped))
2005 m->set_scoped();
2006 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2007 m->set_intrinsic_candidate();
2008 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2009 m->set_has_reserved_stack_access();
2010 if (has_annotation(_java_lang_Deprecated))
2011 m->set_deprecated();
2012 if (has_annotation(_java_lang_Deprecated_for_removal))
2013 m->set_deprecated_for_removal();
2014 }
2015
2016 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2017 assert(ik != nullptr, "invariant");
2018 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2019 ik->set_is_contended(is_contended());
2020 }
2021 if (has_annotation(_jdk_internal_ValueBased)) {
2022 ik->set_has_value_based_class_annotation();
2023 if (DiagnoseSyncOnValueBasedClasses) {
2024 ik->set_is_value_based();
2025 }
2026 }
2027 if (has_annotation(_java_lang_Deprecated)) {
2028 Array<Method*>* methods = ik->methods();
2029 int length = ik->methods()->length();
2030 for (int i = 0; i < length; i++) {
2031 Method* m = methods->at(i);
2032 m->set_deprecated();
2033 }
2034 }
2035 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2036 Array<Method*>* methods = ik->methods();
2037 int length = ik->methods()->length();
2038 for (int i = 0; i < length; i++) {
2039 Method* m = methods->at(i);
2040 m->set_deprecated_for_removal();
2041 }
2042 }
2043 }
2044
2045 #define MAX_ARGS_SIZE 255
2046 #define MAX_CODE_SIZE 65535
2047 #define INITIAL_MAX_LVT_NUMBER 256
2048
2049 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2050 *
2051 * Rules for LVT's and LVTT's are:
2052 * - There can be any number of LVT's and LVTT's.
2053 * - If there are n LVT's, it is the same as if there was just
2054 * one LVT containing all the entries from the n LVT's.
2055 * - There may be no more than one LVT entry per local variable.
2056 * Two LVT entries are 'equal' if these fields are the same:
2057 * start_pc, length, name, slot
2058 * - There may be no more than one LVTT entry per each LVT entry.
2059 * Each LVTT entry has to match some LVT entry.
2060 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2061 */
2062 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2063 int lvt_cnt,
2064 u2* const localvariable_table_length,
2065 const unsafe_u2** const localvariable_table_start,
2066 int lvtt_cnt,
2067 u2* const localvariable_type_table_length,
2068 const unsafe_u2** const localvariable_type_table_start,
2069 TRAPS) {
2070
2071 ResourceMark rm(THREAD);
2072
2073 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2074 256, AnyObj::RESOURCE_AREA, mtInternal,
2075 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2076
2077 LVT_HashTable* const table = new LVT_HashTable();
2078
2079 // To fill LocalVariableTable in
2080 const Classfile_LVT_Element* cf_lvt;
2081 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2082
2083 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2084 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2085 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2086 copy_lvt_element(&cf_lvt[idx], lvt);
2087 // If no duplicates, add LVT elem in hashtable.
2088 if (table->put(*lvt, lvt) == false
2089 && _need_verify
2090 && _major_version >= JAVA_1_5_VERSION) {
2091 classfile_parse_error("Duplicated LocalVariableTable attribute "
2092 "entry for '%s' in class file %s",
2093 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2094 THREAD);
2095 return;
2096 }
2097 }
2098 }
2099
2100 // To merge LocalVariableTable and LocalVariableTypeTable
2101 const Classfile_LVT_Element* cf_lvtt;
2102 LocalVariableTableElement lvtt_elem;
2103
2104 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2105 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2106 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2107 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2108 LocalVariableTableElement** entry = table->get(lvtt_elem);
2109 if (entry == nullptr) {
2110 if (_need_verify) {
2111 classfile_parse_error("LVTT entry for '%s' in class file %s "
2112 "does not match any LVT entry",
2113 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2114 THREAD);
2115 return;
2116 }
2117 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2118 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2119 "entry for '%s' in class file %s",
2120 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2121 THREAD);
2122 return;
2123 } else {
2124 // to add generic signatures into LocalVariableTable
2125 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2126 }
2127 }
2128 }
2129 }
2130
2131
2132 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2133 const u1* runtime_visible_annotations,
2134 int runtime_visible_annotations_length,
2135 const u1* runtime_visible_parameter_annotations,
2136 int runtime_visible_parameter_annotations_length,
2137 const u1* runtime_visible_type_annotations,
2138 int runtime_visible_type_annotations_length,
2139 const u1* annotation_default,
2140 int annotation_default_length,
2141 TRAPS) {
2142
2143 AnnotationArray* a;
2144
2145 if (runtime_visible_annotations_length > 0) {
2146 a = allocate_annotations(runtime_visible_annotations,
2147 runtime_visible_annotations_length,
2148 CHECK);
2149 cm->set_method_annotations(a);
2150 }
2151
2152 if (runtime_visible_parameter_annotations_length > 0) {
2153 a = allocate_annotations(runtime_visible_parameter_annotations,
2154 runtime_visible_parameter_annotations_length,
2155 CHECK);
2156 cm->set_parameter_annotations(a);
2157 }
2158
2159 if (annotation_default_length > 0) {
2160 a = allocate_annotations(annotation_default,
2161 annotation_default_length,
2162 CHECK);
2163 cm->set_default_annotations(a);
2164 }
2165
2166 if (runtime_visible_type_annotations_length > 0) {
2167 a = allocate_annotations(runtime_visible_type_annotations,
2168 runtime_visible_type_annotations_length,
2169 CHECK);
2170 cm->set_type_annotations(a);
2171 }
2172 }
2173
2174
2175 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2176 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2177 // Method* to save footprint, so we only know the size of the resulting Method* when the
2178 // entire method attribute is parsed.
2179 //
2180 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2181
2182 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2183 bool is_interface,
2184 bool is_value_class,
2185 bool is_abstract_class,
2186 const ConstantPool* cp,
2187 bool* const has_localvariable_table,
2188 TRAPS) {
2189 assert(cfs != nullptr, "invariant");
2190 assert(cp != nullptr, "invariant");
2191 assert(has_localvariable_table != nullptr, "invariant");
2192
2193 ResourceMark rm(THREAD);
2194 // Parse fixed parts:
2195 // access_flags, name_index, descriptor_index, attributes_count
2196 cfs->guarantee_more(8, CHECK_NULL);
2197
2198 int flags = cfs->get_u2_fast();
2199 const u2 name_index = cfs->get_u2_fast();
2200 const int cp_size = cp->length();
2201 guarantee_property(
2202 valid_symbol_at(name_index),
2203 "Illegal constant pool index %u for method name in class file %s",
2204 name_index, CHECK_NULL);
2205 const Symbol* const name = cp->symbol_at(name_index);
2206 verify_legal_method_name(name, CHECK_NULL);
2207
2208 const u2 signature_index = cfs->get_u2_fast();
2209 guarantee_property(
2210 valid_symbol_at(signature_index),
2211 "Illegal constant pool index %u for method signature in class file %s",
2212 signature_index, CHECK_NULL);
2213 const Symbol* const signature = cp->symbol_at(signature_index);
2214
2215 if (name == vmSymbols::class_initializer_name()) {
2216 // We ignore the other access flags for a valid class initializer.
2217 // (JVM Spec 2nd ed., chapter 4.6)
2218 if (_major_version < 51) { // backward compatibility
2219 flags = JVM_ACC_STATIC;
2220 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2221 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2222 } else {
2223 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2224 return nullptr;
2225 }
2226 } else {
2227 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2228 }
2229
2230 if (name == vmSymbols::object_initializer_name() && is_interface) {
2231 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2232 return nullptr;
2233 }
2234
2235 if (EnableValhalla) {
2236 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2237 && ((flags & JVM_ACC_STATIC) == 0 )
2238 && !_access_flags.is_identity_class()) {
2239 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2240 return nullptr;
2241 }
2242 }
2243
2244 int args_size = -1; // only used when _need_verify is true
2245 if (_need_verify) {
2246 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2247 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2248 verify_legal_method_signature(name, signature, CHECK_NULL);
2249 if (args_size > MAX_ARGS_SIZE) {
2250 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2251 return nullptr;
2252 }
2253 }
2254
2255 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2256
2257 // Default values for code and exceptions attribute elements
2258 u2 max_stack = 0;
2259 u2 max_locals = 0;
2260 u4 code_length = 0;
2261 const u1* code_start = nullptr;
2262 u2 exception_table_length = 0;
2263 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2264 Array<int>* exception_handlers = Universe::the_empty_int_array();
2265 u2 checked_exceptions_length = 0;
2266 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2267 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2268 int linenumber_table_length = 0;
2269 int total_lvt_length = 0;
2270 u2 lvt_cnt = 0;
2271 u2 lvtt_cnt = 0;
2272 bool lvt_allocated = false;
2273 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2274 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2275 u2* localvariable_table_length = nullptr;
2276 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2277 u2* localvariable_type_table_length = nullptr;
2278 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2279 int method_parameters_length = -1;
2280 const u1* method_parameters_data = nullptr;
2281 bool method_parameters_seen = false;
2282 bool parsed_code_attribute = false;
2283 bool parsed_checked_exceptions_attribute = false;
2284 bool parsed_stackmap_attribute = false;
2285 // stackmap attribute - JDK1.5
2286 const u1* stackmap_data = nullptr;
2287 int stackmap_data_length = 0;
2288 u2 generic_signature_index = 0;
2289 MethodAnnotationCollector parsed_annotations;
2290 const u1* runtime_visible_annotations = nullptr;
2291 int runtime_visible_annotations_length = 0;
2292 const u1* runtime_visible_parameter_annotations = nullptr;
2293 int runtime_visible_parameter_annotations_length = 0;
2294 const u1* runtime_visible_type_annotations = nullptr;
2295 int runtime_visible_type_annotations_length = 0;
2296 bool runtime_invisible_annotations_exists = false;
2297 bool runtime_invisible_type_annotations_exists = false;
2298 bool runtime_invisible_parameter_annotations_exists = false;
2299 const u1* annotation_default = nullptr;
2300 int annotation_default_length = 0;
2301
2302 // Parse code and exceptions attribute
2303 u2 method_attributes_count = cfs->get_u2_fast();
2304 while (method_attributes_count--) {
2305 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2306 const u2 method_attribute_name_index = cfs->get_u2_fast();
2307 const u4 method_attribute_length = cfs->get_u4_fast();
2308 guarantee_property(
2309 valid_symbol_at(method_attribute_name_index),
2310 "Invalid method attribute name index %u in class file %s",
2311 method_attribute_name_index, CHECK_NULL);
2312
2313 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2314 if (method_attribute_name == vmSymbols::tag_code()) {
2315 // Parse Code attribute
2316 if (_need_verify) {
2317 guarantee_property(
2318 !access_flags.is_native() && !access_flags.is_abstract(),
2319 "Code attribute in native or abstract methods in class file %s",
2320 CHECK_NULL);
2321 }
2322 if (parsed_code_attribute) {
2323 classfile_parse_error("Multiple Code attributes in class file %s",
2324 THREAD);
2325 return nullptr;
2326 }
2327 parsed_code_attribute = true;
2328
2329 // Stack size, locals size, and code size
2330 cfs->guarantee_more(8, CHECK_NULL);
2331 max_stack = cfs->get_u2_fast();
2332 max_locals = cfs->get_u2_fast();
2333 code_length = cfs->get_u4_fast();
2334 if (_need_verify) {
2335 guarantee_property(args_size <= max_locals,
2336 "Arguments can't fit into locals in class file %s",
2337 CHECK_NULL);
2338 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2339 "Invalid method Code length %u in class file %s",
2340 code_length, CHECK_NULL);
2341 }
2342 // Code pointer
2343 code_start = cfs->current();
2344 assert(code_start != nullptr, "null code start");
2345 cfs->guarantee_more(code_length, CHECK_NULL);
2346 cfs->skip_u1_fast(code_length);
2347
2348 // Exception handler table
2349 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2350 exception_table_length = cfs->get_u2_fast();
2351 if (exception_table_length > 0) {
2352 exception_table_start = parse_exception_table(cfs,
2353 code_length,
2354 exception_table_length,
2355 CHECK_NULL);
2356 }
2357
2358 // Parse additional attributes in code attribute
2359 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2360 u2 code_attributes_count = cfs->get_u2_fast();
2361
2362 unsigned int calculated_attribute_length = 0;
2363
2364 calculated_attribute_length =
2365 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2366 calculated_attribute_length += checked_cast<unsigned int>(
2367 code_length +
2368 sizeof(exception_table_length) +
2369 sizeof(code_attributes_count) +
2370 exception_table_length *
2371 ( sizeof(u2) + // start_pc
2372 sizeof(u2) + // end_pc
2373 sizeof(u2) + // handler_pc
2374 sizeof(u2) )); // catch_type_index
2375
2376 while (code_attributes_count--) {
2377 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2378 const u2 code_attribute_name_index = cfs->get_u2_fast();
2379 const u4 code_attribute_length = cfs->get_u4_fast();
2380 calculated_attribute_length += code_attribute_length +
2381 (unsigned)sizeof(code_attribute_name_index) +
2382 (unsigned)sizeof(code_attribute_length);
2383 guarantee_property(valid_symbol_at(code_attribute_name_index),
2384 "Invalid code attribute name index %u in class file %s",
2385 code_attribute_name_index,
2386 CHECK_NULL);
2387 if (LoadLineNumberTables &&
2388 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2389 // Parse and compress line number table
2390 parse_linenumber_table(code_attribute_length,
2391 code_length,
2392 &linenumber_table,
2393 CHECK_NULL);
2394
2395 } else if (LoadLocalVariableTables &&
2396 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2397 // Parse local variable table
2398 if (!lvt_allocated) {
2399 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2400 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2401 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2402 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2403 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2404 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2405 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2406 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2407 lvt_allocated = true;
2408 }
2409 if (lvt_cnt == max_lvt_cnt) {
2410 max_lvt_cnt <<= 1;
2411 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2412 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2413 }
2414 localvariable_table_start[lvt_cnt] =
2415 parse_localvariable_table(cfs,
2416 code_length,
2417 max_locals,
2418 code_attribute_length,
2419 &localvariable_table_length[lvt_cnt],
2420 false, // is not LVTT
2421 CHECK_NULL);
2422 total_lvt_length += localvariable_table_length[lvt_cnt];
2423 lvt_cnt++;
2424 } else if (LoadLocalVariableTypeTables &&
2425 _major_version >= JAVA_1_5_VERSION &&
2426 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2427 if (!lvt_allocated) {
2428 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2429 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2430 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2431 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2432 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2433 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2434 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2435 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2436 lvt_allocated = true;
2437 }
2438 // Parse local variable type table
2439 if (lvtt_cnt == max_lvtt_cnt) {
2440 max_lvtt_cnt <<= 1;
2441 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2442 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2443 }
2444 localvariable_type_table_start[lvtt_cnt] =
2445 parse_localvariable_table(cfs,
2446 code_length,
2447 max_locals,
2448 code_attribute_length,
2449 &localvariable_type_table_length[lvtt_cnt],
2450 true, // is LVTT
2451 CHECK_NULL);
2452 lvtt_cnt++;
2453 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2454 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2455 // Stack map is only needed by the new verifier in JDK1.5.
2456 if (parsed_stackmap_attribute) {
2457 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2458 return nullptr;
2459 }
2460 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2461 stackmap_data_length = code_attribute_length;
2462 parsed_stackmap_attribute = true;
2463 } else {
2464 // Skip unknown attributes
2465 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2466 }
2467 }
2468 // check method attribute length
2469 if (_need_verify) {
2470 guarantee_property(method_attribute_length == calculated_attribute_length,
2471 "Code segment has wrong length in class file %s",
2472 CHECK_NULL);
2473 }
2474 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2475 // Parse Exceptions attribute
2476 if (parsed_checked_exceptions_attribute) {
2477 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2478 THREAD);
2479 return nullptr;
2480 }
2481 parsed_checked_exceptions_attribute = true;
2482 checked_exceptions_start =
2483 parse_checked_exceptions(cfs,
2484 &checked_exceptions_length,
2485 method_attribute_length,
2486 CHECK_NULL);
2487 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2488 // reject multiple method parameters
2489 if (method_parameters_seen) {
2490 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2491 THREAD);
2492 return nullptr;
2493 }
2494 method_parameters_seen = true;
2495 method_parameters_length = cfs->get_u1_fast();
2496 const u4 real_length = (method_parameters_length * 4u) + 1u;
2497 if (method_attribute_length != real_length) {
2498 classfile_parse_error(
2499 "Invalid MethodParameters method attribute length %u in class file",
2500 method_attribute_length, THREAD);
2501 return nullptr;
2502 }
2503 method_parameters_data = cfs->current();
2504 cfs->skip_u2_fast(method_parameters_length);
2505 cfs->skip_u2_fast(method_parameters_length);
2506 // ignore this attribute if it cannot be reflected
2507 if (!vmClasses::Parameter_klass_loaded())
2508 method_parameters_length = -1;
2509 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2510 if (method_attribute_length != 0) {
2511 classfile_parse_error(
2512 "Invalid Synthetic method attribute length %u in class file %s",
2513 method_attribute_length, THREAD);
2514 return nullptr;
2515 }
2516 // Should we check that there hasn't already been a synthetic attribute?
2517 access_flags.set_is_synthetic();
2518 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2519 if (method_attribute_length != 0) {
2520 classfile_parse_error(
2521 "Invalid Deprecated method attribute length %u in class file %s",
2522 method_attribute_length, THREAD);
2523 return nullptr;
2524 }
2525 } else if (_major_version >= JAVA_1_5_VERSION) {
2526 if (method_attribute_name == vmSymbols::tag_signature()) {
2527 if (generic_signature_index != 0) {
2528 classfile_parse_error(
2529 "Multiple Signature attributes for method in class file %s",
2530 THREAD);
2531 return nullptr;
2532 }
2533 if (method_attribute_length != 2) {
2534 classfile_parse_error(
2535 "Invalid Signature attribute length %u in class file %s",
2536 method_attribute_length, THREAD);
2537 return nullptr;
2538 }
2539 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2540 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2541 if (runtime_visible_annotations != nullptr) {
2542 classfile_parse_error(
2543 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2544 THREAD);
2545 return nullptr;
2546 }
2547 runtime_visible_annotations_length = method_attribute_length;
2548 runtime_visible_annotations = cfs->current();
2549 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2550 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2551 parse_annotations(cp,
2552 runtime_visible_annotations,
2553 runtime_visible_annotations_length,
2554 &parsed_annotations,
2555 _loader_data,
2556 _can_access_vm_annotations);
2557 cfs->skip_u1_fast(runtime_visible_annotations_length);
2558 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2559 if (runtime_invisible_annotations_exists) {
2560 classfile_parse_error(
2561 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2562 THREAD);
2563 return nullptr;
2564 }
2565 runtime_invisible_annotations_exists = true;
2566 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2567 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2568 if (runtime_visible_parameter_annotations != nullptr) {
2569 classfile_parse_error(
2570 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2571 THREAD);
2572 return nullptr;
2573 }
2574 runtime_visible_parameter_annotations_length = method_attribute_length;
2575 runtime_visible_parameter_annotations = cfs->current();
2576 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2577 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2578 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2579 if (runtime_invisible_parameter_annotations_exists) {
2580 classfile_parse_error(
2581 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2582 THREAD);
2583 return nullptr;
2584 }
2585 runtime_invisible_parameter_annotations_exists = true;
2586 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2587 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2588 if (annotation_default != nullptr) {
2589 classfile_parse_error(
2590 "Multiple AnnotationDefault attributes for method in class file %s",
2591 THREAD);
2592 return nullptr;
2593 }
2594 annotation_default_length = method_attribute_length;
2595 annotation_default = cfs->current();
2596 assert(annotation_default != nullptr, "null annotation default");
2597 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2598 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2599 if (runtime_visible_type_annotations != nullptr) {
2600 classfile_parse_error(
2601 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2602 THREAD);
2603 return nullptr;
2604 }
2605 runtime_visible_type_annotations_length = method_attribute_length;
2606 runtime_visible_type_annotations = cfs->current();
2607 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2608 // No need for the VM to parse Type annotations
2609 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2610 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2611 if (runtime_invisible_type_annotations_exists) {
2612 classfile_parse_error(
2613 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2614 THREAD);
2615 return nullptr;
2616 }
2617 runtime_invisible_type_annotations_exists = true;
2618 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2619 } else {
2620 // Skip unknown attributes
2621 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2622 }
2623 } else {
2624 // Skip unknown attributes
2625 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2626 }
2627 }
2628
2629 if (linenumber_table != nullptr) {
2630 linenumber_table->write_terminator();
2631 linenumber_table_length = linenumber_table->position();
2632 }
2633
2634 // Make sure there's at least one Code attribute in non-native/non-abstract method
2635 if (_need_verify) {
2636 guarantee_property(access_flags.is_native() ||
2637 access_flags.is_abstract() ||
2638 parsed_code_attribute,
2639 "Absent Code attribute in method that is not native or abstract in class file %s",
2640 CHECK_NULL);
2641 }
2642
2643 // All sizing information for a Method* is finally available, now create it
2644 InlineTableSizes sizes(
2645 total_lvt_length,
2646 linenumber_table_length,
2647 exception_table_length,
2648 checked_exceptions_length,
2649 method_parameters_length,
2650 generic_signature_index,
2651 runtime_visible_annotations_length,
2652 runtime_visible_parameter_annotations_length,
2653 runtime_visible_type_annotations_length,
2654 annotation_default_length,
2655 0);
2656
2657 Method* const m = Method::allocate(_loader_data,
2658 code_length,
2659 access_flags,
2660 &sizes,
2661 ConstMethod::NORMAL,
2662 _cp->symbol_at(name_index),
2663 CHECK_NULL);
2664
2665 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2666
2667 // Fill in information from fixed part (access_flags already set)
2668 m->set_constants(_cp);
2669 m->set_name_index(name_index);
2670 m->set_signature_index(signature_index);
2671 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2672 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2673
2674 // Fill in code attribute information
2675 m->set_max_stack(max_stack);
2676 m->set_max_locals(max_locals);
2677 if (stackmap_data != nullptr) {
2678 m->constMethod()->copy_stackmap_data(_loader_data,
2679 (u1*)stackmap_data,
2680 stackmap_data_length,
2681 CHECK_NULL);
2682 }
2683
2684 // Copy byte codes
2685 m->set_code((u1*)code_start);
2686
2687 // Copy line number table
2688 if (linenumber_table != nullptr) {
2689 memcpy(m->compressed_linenumber_table(),
2690 linenumber_table->buffer(),
2691 linenumber_table_length);
2692 }
2693
2694 // Copy exception table
2695 if (exception_table_length > 0) {
2696 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2697 m->exception_table_start(),
2698 exception_table_length * sizeof(ExceptionTableElement),
2699 sizeof(u2));
2700 }
2701
2702 // Copy method parameters
2703 if (method_parameters_length > 0) {
2704 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2705 for (int i = 0; i < method_parameters_length; i++) {
2706 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2707 method_parameters_data += 2;
2708 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2709 method_parameters_data += 2;
2710 }
2711 }
2712
2713 // Copy checked exceptions
2714 if (checked_exceptions_length > 0) {
2715 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2716 m->checked_exceptions_start(),
2717 checked_exceptions_length * sizeof(CheckedExceptionElement),
2718 sizeof(u2));
2719 }
2720
2721 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2722 if (total_lvt_length > 0) {
2723 *has_localvariable_table = true;
2724 copy_localvariable_table(m->constMethod(),
2725 lvt_cnt,
2726 localvariable_table_length,
2727 localvariable_table_start,
2728 lvtt_cnt,
2729 localvariable_type_table_length,
2730 localvariable_type_table_start,
2731 CHECK_NULL);
2732 }
2733
2734 if (parsed_annotations.has_any_annotations())
2735 parsed_annotations.apply_to(methodHandle(THREAD, m));
2736
2737 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2738 m->set_is_hidden();
2739 }
2740
2741 // Copy annotations
2742 copy_method_annotations(m->constMethod(),
2743 runtime_visible_annotations,
2744 runtime_visible_annotations_length,
2745 runtime_visible_parameter_annotations,
2746 runtime_visible_parameter_annotations_length,
2747 runtime_visible_type_annotations,
2748 runtime_visible_type_annotations_length,
2749 annotation_default,
2750 annotation_default_length,
2751 CHECK_NULL);
2752
2753 if (InstanceKlass::is_finalization_enabled() &&
2754 name == vmSymbols::finalize_method_name() &&
2755 signature == vmSymbols::void_method_signature()) {
2756 if (m->is_empty_method()) {
2757 _has_empty_finalizer = true;
2758 } else {
2759 _has_finalizer = true;
2760 }
2761 }
2762
2763 NOT_PRODUCT(m->verify());
2764 return m;
2765 }
2766
2767
2768 // Side-effects: populates the _methods field in the parser
2769 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2770 bool is_interface,
2771 bool is_value_class,
2772 bool is_abstract_type,
2773 bool* const has_localvariable_table,
2774 bool* has_final_method,
2775 bool* declares_nonstatic_concrete_methods,
2776 TRAPS) {
2777 assert(cfs != nullptr, "invariant");
2778 assert(has_localvariable_table != nullptr, "invariant");
2779 assert(has_final_method != nullptr, "invariant");
2780 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2781
2782 assert(nullptr == _methods, "invariant");
2783
2784 cfs->guarantee_more(2, CHECK); // length
2785 const u2 length = cfs->get_u2_fast();
2786 if (length == 0) {
2787 _methods = Universe::the_empty_method_array();
2788 } else {
2789 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2790 length,
2791 nullptr,
2792 CHECK);
2793
2794 for (int index = 0; index < length; index++) {
2795 Method* method = parse_method(cfs,
2796 is_interface,
2797 is_value_class,
2798 is_abstract_type,
2799 _cp,
2800 has_localvariable_table,
2801 CHECK);
2802
2803 if (method->is_final()) {
2804 *has_final_method = true;
2805 }
2806 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2807 // used for interface initialization, and default method inheritance analysis
2808 if (is_interface && !(*declares_nonstatic_concrete_methods)
2809 && !method->is_abstract() && !method->is_static()) {
2810 *declares_nonstatic_concrete_methods = true;
2811 }
2812 _methods->at_put(index, method);
2813 }
2814
2815 if (_need_verify && length > 1) {
2816 // Check duplicated methods
2817 ResourceMark rm(THREAD);
2818 // Set containing name-signature pairs
2819 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2820 for (int i = 0; i < length; i++) {
2821 const Method* const m = _methods->at(i);
2822 NameSigHash name_and_sig(m->name(), m->signature());
2823 // If no duplicates, add name/signature in hashtable names_and_sigs.
2824 if(!names_and_sigs->put(name_and_sig, 0)) {
2825 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2826 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2827 return;
2828 }
2829 }
2830 }
2831 }
2832 }
2833
2834 static const intArray* sort_methods(Array<Method*>* methods) {
2835 const int length = methods->length();
2836 // If JVMTI original method ordering or sharing is enabled we have to
2837 // remember the original class file ordering.
2838 // We temporarily use the vtable_index field in the Method* to store the
2839 // class file index, so we can read in after calling qsort.
2840 // Put the method ordering in the shared archive.
2841 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2842 for (int index = 0; index < length; index++) {
2843 Method* const m = methods->at(index);
2844 assert(!m->valid_vtable_index(), "vtable index should not be set");
2845 m->set_vtable_index(index);
2846 }
2847 }
2848 // Sort method array by ascending method name (for faster lookups & vtable construction)
2849 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2850 Method::sort_methods(methods);
2851
2852 intArray* method_ordering = nullptr;
2853 // If JVMTI original method ordering or sharing is enabled construct int
2854 // array remembering the original ordering
2855 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2856 method_ordering = new intArray(length, length, -1);
2857 for (int index = 0; index < length; index++) {
2858 Method* const m = methods->at(index);
2859 const int old_index = m->vtable_index();
2860 assert(old_index >= 0 && old_index < length, "invalid method index");
2861 method_ordering->at_put(index, old_index);
2862 m->set_vtable_index(Method::invalid_vtable_index);
2863 }
2864 }
2865 return method_ordering;
2866 }
2867
2868 // Parse generic_signature attribute for methods and fields
2869 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2870 TRAPS) {
2871 assert(cfs != nullptr, "invariant");
2872
2873 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2874 const u2 generic_signature_index = cfs->get_u2_fast();
2875 guarantee_property(
2876 valid_symbol_at(generic_signature_index),
2877 "Invalid Signature attribute at constant pool index %u in class file %s",
2878 generic_signature_index, CHECK_0);
2879 return generic_signature_index;
2880 }
2881
2882 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2883 TRAPS) {
2884
2885 assert(cfs != nullptr, "invariant");
2886
2887 cfs->guarantee_more(2, CHECK); // sourcefile_index
2888 const u2 sourcefile_index = cfs->get_u2_fast();
2889 guarantee_property(
2890 valid_symbol_at(sourcefile_index),
2891 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2892 sourcefile_index, CHECK);
2893 set_class_sourcefile_index(sourcefile_index);
2894 }
2895
2896 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2897 int length,
2898 TRAPS) {
2899 assert(cfs != nullptr, "invariant");
2900
2901 const u1* const sde_buffer = cfs->current();
2902 assert(sde_buffer != nullptr, "null sde buffer");
2903
2904 // Don't bother storing it if there is no way to retrieve it
2905 if (JvmtiExport::can_get_source_debug_extension()) {
2906 assert((length+1) > length, "Overflow checking");
2907 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2908 for (int i = 0; i < length; i++) {
2909 sde[i] = sde_buffer[i];
2910 }
2911 sde[length] = '\0';
2912 set_class_sde_buffer((const char*)sde, length);
2913 }
2914 // Got utf8 string, set stream position forward
2915 cfs->skip_u1(length, CHECK);
2916 }
2917
2918
2919 // Inner classes can be static, private or protected (classic VM does this)
2920 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2921 JVM_ACC_PRIVATE | \
2922 JVM_ACC_PROTECTED | \
2923 JVM_ACC_STATIC \
2924 )
2925
2926 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2927 // Return -1 if none is found.
2928 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2929 Symbol* cp_klass_name = cp->klass_name_at(inner);
2930 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2931 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2932 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2933 return idx;
2934 }
2935 }
2936 return -1;
2937 }
2938
2939 // Return the outer_class_info_index for the InnerClasses entry containing the
2940 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2941 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2942 if (inner == 0) return -1;
2943 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2944 if (idx == -1) return -1;
2945 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2946 return result;
2947 }
2948
2949 // Return true if circularity is found, false if no circularity is found.
2950 // Use Floyd's cycle finding algorithm.
2951 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2952 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2953 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2954
2955 while (fast != -1 && fast != 0) {
2956 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2957 return true; // found a circularity
2958 }
2959 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2960 if (fast == -1) return false;
2961 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2962 if (fast == -1) return false;
2963 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2964 assert(slow != -1, "sanity check");
2965 }
2966 return false;
2967 }
2968
2969 // Loop through each InnerClasses entry checking for circularities and duplications
2970 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
2971 // return true if a circularity or entries with duplicate inner_class_info_indexes
2972 // are found.
2973 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2974 // Loop through each InnerClasses entry.
2975 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2976 // Return true if there are circular entries.
2977 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2978 return true;
2979 }
2980 // Check if there are duplicate entries or entries with the same inner_class_info_index.
2981 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2982 y += InstanceKlass::inner_class_next_offset) {
2983
2984 // 4347400: make sure there's no duplicate entry in the classes array
2985 if (_major_version >= JAVA_1_5_VERSION) {
2986 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2987 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2988 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2989 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2990 "Duplicate entry in InnerClasses attribute in class file %s",
2991 CHECK_(true));
2992 }
2993 // Return true if there are two entries with the same inner_class_info_index.
2994 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2995 return true;
2996 }
2997 }
2998 }
2999 return false;
3000 }
3001
3002 // Return number of classes in the inner classes attribute table
3003 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3004 const ConstantPool* cp,
3005 const u1* const inner_classes_attribute_start,
3006 bool parsed_enclosingmethod_attribute,
3007 u2 enclosing_method_class_index,
3008 u2 enclosing_method_method_index,
3009 TRAPS) {
3010 const u1* const current_mark = cfs->current();
3011 u2 length = 0;
3012 if (inner_classes_attribute_start != nullptr) {
3013 cfs->set_current(inner_classes_attribute_start);
3014 cfs->guarantee_more(2, CHECK_0); // length
3015 length = cfs->get_u2_fast();
3016 }
3017
3018 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3019 // method data:
3020 // [inner_class_info_index,
3021 // outer_class_info_index,
3022 // inner_name_index,
3023 // inner_class_access_flags,
3024 // ...
3025 // enclosing_method_class_index,
3026 // enclosing_method_method_index]
3027 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3028 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3029 _inner_classes = inner_classes;
3030
3031 int index = 0;
3032 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3033 for (int n = 0; n < length; n++) {
3034 // Inner class index
3035 const u2 inner_class_info_index = cfs->get_u2_fast();
3036 guarantee_property(
3037 valid_klass_reference_at(inner_class_info_index),
3038 "inner_class_info_index %u has bad constant type in class file %s",
3039 inner_class_info_index, CHECK_0);
3040 // Outer class index
3041 const u2 outer_class_info_index = cfs->get_u2_fast();
3042 guarantee_property(
3043 outer_class_info_index == 0 ||
3044 valid_klass_reference_at(outer_class_info_index),
3045 "outer_class_info_index %u has bad constant type in class file %s",
3046 outer_class_info_index, CHECK_0);
3047
3048 if (outer_class_info_index != 0) {
3049 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3050 char* bytes = (char*)outer_class_name->bytes();
3051 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3052 "Outer class is an array class in class file %s", CHECK_0);
3053 }
3054 // Inner class name
3055 const u2 inner_name_index = cfs->get_u2_fast();
3056 guarantee_property(
3057 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3058 "inner_name_index %u has bad constant type in class file %s",
3059 inner_name_index, CHECK_0);
3060 if (_need_verify) {
3061 guarantee_property(inner_class_info_index != outer_class_info_index,
3062 "Class is both outer and inner class in class file %s", CHECK_0);
3063 }
3064
3065 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3066 // JVM_ACC_MODULE is defined in JDK-9 and later.
3067 if (_major_version >= JAVA_9_VERSION) {
3068 recognized_modifiers |= JVM_ACC_MODULE;
3069 }
3070
3071 // Access flags
3072 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3073
3074 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3075 // Set abstract bit for old class files for backward compatibility
3076 flags |= JVM_ACC_ABSTRACT;
3077 }
3078
3079 if (!supports_inline_types()) {
3080 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3081 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3082 if (!is_module && !is_interface) {
3083 flags |= JVM_ACC_IDENTITY;
3084 }
3085 }
3086
3087 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3088 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3089 AccessFlags inner_access_flags(flags);
3090
3091 inner_classes->at_put(index++, inner_class_info_index);
3092 inner_classes->at_put(index++, outer_class_info_index);
3093 inner_classes->at_put(index++, inner_name_index);
3094 inner_classes->at_put(index++, inner_access_flags.as_short());
3095 }
3096
3097 // Check for circular and duplicate entries.
3098 bool has_circularity = false;
3099 if (_need_verify) {
3100 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3101 if (has_circularity) {
3102 // If circularity check failed then ignore InnerClasses attribute.
3103 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3104 index = 0;
3105 if (parsed_enclosingmethod_attribute) {
3106 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3107 _inner_classes = inner_classes;
3108 } else {
3109 _inner_classes = Universe::the_empty_short_array();
3110 }
3111 }
3112 }
3113 // Set EnclosingMethod class and method indexes.
3114 if (parsed_enclosingmethod_attribute) {
3115 inner_classes->at_put(index++, enclosing_method_class_index);
3116 inner_classes->at_put(index++, enclosing_method_method_index);
3117 }
3118 assert(index == size || has_circularity, "wrong size");
3119
3120 // Restore buffer's current position.
3121 cfs->set_current(current_mark);
3122
3123 return length;
3124 }
3125
3126 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3127 const u1* const nest_members_attribute_start,
3128 TRAPS) {
3129 const u1* const current_mark = cfs->current();
3130 u2 length = 0;
3131 if (nest_members_attribute_start != nullptr) {
3132 cfs->set_current(nest_members_attribute_start);
3133 cfs->guarantee_more(2, CHECK_0); // length
3134 length = cfs->get_u2_fast();
3135 }
3136 const int size = length;
3137 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3138 _nest_members = nest_members;
3139
3140 int index = 0;
3141 cfs->guarantee_more(2 * length, CHECK_0);
3142 for (int n = 0; n < length; n++) {
3143 const u2 class_info_index = cfs->get_u2_fast();
3144 guarantee_property(
3145 valid_klass_reference_at(class_info_index),
3146 "Nest member class_info_index %u has bad constant type in class file %s",
3147 class_info_index, CHECK_0);
3148 nest_members->at_put(index++, class_info_index);
3149 }
3150 assert(index == size, "wrong size");
3151
3152 // Restore buffer's current position.
3153 cfs->set_current(current_mark);
3154
3155 return length;
3156 }
3157
3158 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3159 const u1* const permitted_subclasses_attribute_start,
3160 TRAPS) {
3161 const u1* const current_mark = cfs->current();
3162 u2 length = 0;
3163 if (permitted_subclasses_attribute_start != nullptr) {
3164 cfs->set_current(permitted_subclasses_attribute_start);
3165 cfs->guarantee_more(2, CHECK_0); // length
3166 length = cfs->get_u2_fast();
3167 }
3168 const int size = length;
3169 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3170 _permitted_subclasses = permitted_subclasses;
3171
3172 if (length > 0) {
3173 int index = 0;
3174 cfs->guarantee_more(2 * length, CHECK_0);
3175 for (int n = 0; n < length; n++) {
3176 const u2 class_info_index = cfs->get_u2_fast();
3177 guarantee_property(
3178 valid_klass_reference_at(class_info_index),
3179 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3180 class_info_index, CHECK_0);
3181 permitted_subclasses->at_put(index++, class_info_index);
3182 }
3183 assert(index == size, "wrong size");
3184 }
3185
3186 // Restore buffer's current position.
3187 cfs->set_current(current_mark);
3188
3189 return length;
3190 }
3191
3192 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3193 const u1* const loadable_descriptors_attribute_start,
3194 TRAPS) {
3195 const u1* const current_mark = cfs->current();
3196 u2 length = 0;
3197 if (loadable_descriptors_attribute_start != nullptr) {
3198 cfs->set_current(loadable_descriptors_attribute_start);
3199 cfs->guarantee_more(2, CHECK_0); // length
3200 length = cfs->get_u2_fast();
3201 }
3202 const int size = length;
3203 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3204 _loadable_descriptors = loadable_descriptors;
3205 if (length > 0) {
3206 int index = 0;
3207 cfs->guarantee_more(2 * length, CHECK_0);
3208 for (int n = 0; n < length; n++) {
3209 const u2 descriptor_index = cfs->get_u2_fast();
3210 guarantee_property(
3211 valid_symbol_at(descriptor_index),
3212 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3213 descriptor_index, CHECK_0);
3214 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3215 bool valid = legal_field_signature(descriptor, CHECK_0);
3216 if(!valid) {
3217 ResourceMark rm(THREAD);
3218 Exceptions::fthrow(THREAD_AND_LOCATION,
3219 vmSymbols::java_lang_ClassFormatError(),
3220 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3221 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3222 return 0;
3223 }
3224 loadable_descriptors->at_put(index++, descriptor_index);
3225 }
3226 assert(index == size, "wrong size");
3227 }
3228
3229 // Restore buffer's current position.
3230 cfs->set_current(current_mark);
3231
3232 return length;
3233 }
3234
3235 // Record {
3236 // u2 attribute_name_index;
3237 // u4 attribute_length;
3238 // u2 components_count;
3239 // component_info components[components_count];
3240 // }
3241 // component_info {
3242 // u2 name_index;
3243 // u2 descriptor_index
3244 // u2 attributes_count;
3245 // attribute_info_attributes[attributes_count];
3246 // }
3247 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3248 const ConstantPool* cp,
3249 const u1* const record_attribute_start,
3250 TRAPS) {
3251 const u1* const current_mark = cfs->current();
3252 int components_count = 0;
3253 unsigned int calculate_attr_size = 0;
3254 if (record_attribute_start != nullptr) {
3255 cfs->set_current(record_attribute_start);
3256 cfs->guarantee_more(2, CHECK_0); // num of components
3257 components_count = (int)cfs->get_u2_fast();
3258 calculate_attr_size = 2;
3259 }
3260
3261 Array<RecordComponent*>* const record_components =
3262 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3263 _record_components = record_components;
3264
3265 for (int x = 0; x < components_count; x++) {
3266 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3267
3268 const u2 name_index = cfs->get_u2_fast();
3269 guarantee_property(valid_symbol_at(name_index),
3270 "Invalid constant pool index %u for name in Record attribute in class file %s",
3271 name_index, CHECK_0);
3272 const Symbol* const name = cp->symbol_at(name_index);
3273 verify_legal_field_name(name, CHECK_0);
3274
3275 const u2 descriptor_index = cfs->get_u2_fast();
3276 guarantee_property(valid_symbol_at(descriptor_index),
3277 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3278 descriptor_index, CHECK_0);
3279 const Symbol* const descr = cp->symbol_at(descriptor_index);
3280 verify_legal_field_signature(name, descr, CHECK_0);
3281
3282 const u2 attributes_count = cfs->get_u2_fast();
3283 calculate_attr_size += 6;
3284 u2 generic_sig_index = 0;
3285 const u1* runtime_visible_annotations = nullptr;
3286 int runtime_visible_annotations_length = 0;
3287 bool runtime_invisible_annotations_exists = false;
3288 const u1* runtime_visible_type_annotations = nullptr;
3289 int runtime_visible_type_annotations_length = 0;
3290 bool runtime_invisible_type_annotations_exists = false;
3291
3292 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3293 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3294 for (int y = 0; y < attributes_count; y++) {
3295 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3296 const u2 attribute_name_index = cfs->get_u2_fast();
3297 const u4 attribute_length = cfs->get_u4_fast();
3298 calculate_attr_size += 6;
3299 guarantee_property(
3300 valid_symbol_at(attribute_name_index),
3301 "Invalid Record attribute name index %u in class file %s",
3302 attribute_name_index, CHECK_0);
3303
3304 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3305 if (attribute_name == vmSymbols::tag_signature()) {
3306 if (generic_sig_index != 0) {
3307 classfile_parse_error(
3308 "Multiple Signature attributes for Record component in class file %s",
3309 THREAD);
3310 return 0;
3311 }
3312 if (attribute_length != 2) {
3313 classfile_parse_error(
3314 "Invalid Signature attribute length %u in Record component in class file %s",
3315 attribute_length, THREAD);
3316 return 0;
3317 }
3318 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3319
3320 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3321 if (runtime_visible_annotations != nullptr) {
3322 classfile_parse_error(
3323 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3324 return 0;
3325 }
3326 runtime_visible_annotations_length = attribute_length;
3327 runtime_visible_annotations = cfs->current();
3328
3329 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3330 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3331 cfs->skip_u1_fast(runtime_visible_annotations_length);
3332
3333 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3334 if (runtime_invisible_annotations_exists) {
3335 classfile_parse_error(
3336 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3337 return 0;
3338 }
3339 runtime_invisible_annotations_exists = true;
3340 cfs->skip_u1(attribute_length, CHECK_0);
3341
3342 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3343 if (runtime_visible_type_annotations != nullptr) {
3344 classfile_parse_error(
3345 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3346 return 0;
3347 }
3348 runtime_visible_type_annotations_length = attribute_length;
3349 runtime_visible_type_annotations = cfs->current();
3350
3351 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3352 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3353 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3354
3355 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3356 if (runtime_invisible_type_annotations_exists) {
3357 classfile_parse_error(
3358 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3359 return 0;
3360 }
3361 runtime_invisible_type_annotations_exists = true;
3362 cfs->skip_u1(attribute_length, CHECK_0);
3363
3364 } else {
3365 // Skip unknown attributes
3366 cfs->skip_u1(attribute_length, CHECK_0);
3367 }
3368 calculate_attr_size += attribute_length;
3369 } // End of attributes For loop
3370
3371 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3372 runtime_visible_annotations_length,
3373 CHECK_0);
3374 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3375 runtime_visible_type_annotations_length,
3376 CHECK_0);
3377
3378 RecordComponent* record_component =
3379 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3380 annotations, type_annotations, CHECK_0);
3381 record_components->at_put(x, record_component);
3382 } // End of component processing loop
3383
3384 // Restore buffer's current position.
3385 cfs->set_current(current_mark);
3386 return calculate_attr_size;
3387 }
3388
3389 void ClassFileParser::parse_classfile_synthetic_attribute() {
3390 set_class_synthetic_flag(true);
3391 }
3392
3393 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3394 assert(cfs != nullptr, "invariant");
3395
3396 const u2 signature_index = cfs->get_u2(CHECK);
3397 guarantee_property(
3398 valid_symbol_at(signature_index),
3399 "Invalid constant pool index %u in Signature attribute in class file %s",
3400 signature_index, CHECK);
3401 set_class_generic_signature_index(signature_index);
3402 }
3403
3404 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3405 ConstantPool* cp,
3406 u4 attribute_byte_length,
3407 TRAPS) {
3408 assert(cfs != nullptr, "invariant");
3409 assert(cp != nullptr, "invariant");
3410
3411 const u1* const current_start = cfs->current();
3412
3413 guarantee_property(attribute_byte_length >= sizeof(u2),
3414 "Invalid BootstrapMethods attribute length %u in class file %s",
3415 attribute_byte_length,
3416 CHECK);
3417
3418 cfs->guarantee_more(attribute_byte_length, CHECK);
3419
3420 const int attribute_array_length = cfs->get_u2_fast();
3421
3422 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3423 "Short length on BootstrapMethods in class file %s",
3424 CHECK);
3425
3426
3427 // The attribute contains a counted array of counted tuples of shorts,
3428 // represending bootstrap specifiers:
3429 // length*{bootstrap_method_index, argument_count*{argument_index}}
3430 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3431 // operand_count = number of shorts in attr, except for leading length
3432
3433 // The attribute is copied into a short[] array.
3434 // The array begins with a series of short[2] pairs, one for each tuple.
3435 const int index_size = (attribute_array_length * 2);
3436
3437 Array<u2>* const operands =
3438 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3439
3440 // Eagerly assign operands so they will be deallocated with the constant
3441 // pool if there is an error.
3442 cp->set_operands(operands);
3443
3444 int operand_fill_index = index_size;
3445 const int cp_size = cp->length();
3446
3447 for (int n = 0; n < attribute_array_length; n++) {
3448 // Store a 32-bit offset into the header of the operand array.
3449 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3450
3451 // Read a bootstrap specifier.
3452 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3453 const u2 bootstrap_method_index = cfs->get_u2_fast();
3454 const u2 argument_count = cfs->get_u2_fast();
3455 guarantee_property(
3456 valid_cp_range(bootstrap_method_index, cp_size) &&
3457 cp->tag_at(bootstrap_method_index).is_method_handle(),
3458 "bootstrap_method_index %u has bad constant type in class file %s",
3459 bootstrap_method_index,
3460 CHECK);
3461
3462 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3463 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3464 CHECK);
3465
3466 operands->at_put(operand_fill_index++, bootstrap_method_index);
3467 operands->at_put(operand_fill_index++, argument_count);
3468
3469 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3470 for (int j = 0; j < argument_count; j++) {
3471 const u2 argument_index = cfs->get_u2_fast();
3472 guarantee_property(
3473 valid_cp_range(argument_index, cp_size) &&
3474 cp->tag_at(argument_index).is_loadable_constant(),
3475 "argument_index %u has bad constant type in class file %s",
3476 argument_index,
3477 CHECK);
3478 operands->at_put(operand_fill_index++, argument_index);
3479 }
3480 }
3481 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3482 "Bad length on BootstrapMethods in class file %s",
3483 CHECK);
3484 }
3485
3486 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3487 ConstantPool* cp,
3488 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3489 TRAPS) {
3490 assert(cfs != nullptr, "invariant");
3491 assert(cp != nullptr, "invariant");
3492 assert(parsed_annotations != nullptr, "invariant");
3493
3494 // Set inner classes attribute to default sentinel
3495 _inner_classes = Universe::the_empty_short_array();
3496 // Set nest members attribute to default sentinel
3497 _nest_members = Universe::the_empty_short_array();
3498 // Set _permitted_subclasses attribute to default sentinel
3499 _permitted_subclasses = Universe::the_empty_short_array();
3500 // Set _loadable_descriptors attribute to default sentinel
3501 _loadable_descriptors = Universe::the_empty_short_array();
3502 cfs->guarantee_more(2, CHECK); // attributes_count
3503 u2 attributes_count = cfs->get_u2_fast();
3504 bool parsed_sourcefile_attribute = false;
3505 bool parsed_innerclasses_attribute = false;
3506 bool parsed_nest_members_attribute = false;
3507 bool parsed_permitted_subclasses_attribute = false;
3508 bool parsed_loadable_descriptors_attribute = false;
3509 bool parsed_nest_host_attribute = false;
3510 bool parsed_record_attribute = false;
3511 bool parsed_enclosingmethod_attribute = false;
3512 bool parsed_bootstrap_methods_attribute = false;
3513 const u1* runtime_visible_annotations = nullptr;
3514 int runtime_visible_annotations_length = 0;
3515 const u1* runtime_visible_type_annotations = nullptr;
3516 int runtime_visible_type_annotations_length = 0;
3517 bool runtime_invisible_type_annotations_exists = false;
3518 bool runtime_invisible_annotations_exists = false;
3519 bool parsed_source_debug_ext_annotations_exist = false;
3520 const u1* inner_classes_attribute_start = nullptr;
3521 u4 inner_classes_attribute_length = 0;
3522 u2 enclosing_method_class_index = 0;
3523 u2 enclosing_method_method_index = 0;
3524 const u1* nest_members_attribute_start = nullptr;
3525 u4 nest_members_attribute_length = 0;
3526 const u1* record_attribute_start = nullptr;
3527 u4 record_attribute_length = 0;
3528 const u1* permitted_subclasses_attribute_start = nullptr;
3529 u4 permitted_subclasses_attribute_length = 0;
3530 const u1* loadable_descriptors_attribute_start = nullptr;
3531 u4 loadable_descriptors_attribute_length = 0;
3532
3533 // Iterate over attributes
3534 while (attributes_count--) {
3535 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3536 const u2 attribute_name_index = cfs->get_u2_fast();
3537 const u4 attribute_length = cfs->get_u4_fast();
3538 guarantee_property(
3539 valid_symbol_at(attribute_name_index),
3540 "Attribute name has bad constant pool index %u in class file %s",
3541 attribute_name_index, CHECK);
3542 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3543 if (tag == vmSymbols::tag_source_file()) {
3544 // Check for SourceFile tag
3545 if (_need_verify) {
3546 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3547 }
3548 if (parsed_sourcefile_attribute) {
3549 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3550 return;
3551 } else {
3552 parsed_sourcefile_attribute = true;
3553 }
3554 parse_classfile_sourcefile_attribute(cfs, CHECK);
3555 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3556 // Check for SourceDebugExtension tag
3557 if (parsed_source_debug_ext_annotations_exist) {
3558 classfile_parse_error(
3559 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3560 return;
3561 }
3562 parsed_source_debug_ext_annotations_exist = true;
3563 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3564 } else if (tag == vmSymbols::tag_inner_classes()) {
3565 // Check for InnerClasses tag
3566 if (parsed_innerclasses_attribute) {
3567 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3568 return;
3569 } else {
3570 parsed_innerclasses_attribute = true;
3571 }
3572 inner_classes_attribute_start = cfs->current();
3573 inner_classes_attribute_length = attribute_length;
3574 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3575 } else if (tag == vmSymbols::tag_synthetic()) {
3576 // Check for Synthetic tag
3577 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3578 if (attribute_length != 0) {
3579 classfile_parse_error(
3580 "Invalid Synthetic classfile attribute length %u in class file %s",
3581 attribute_length, THREAD);
3582 return;
3583 }
3584 parse_classfile_synthetic_attribute();
3585 } else if (tag == vmSymbols::tag_deprecated()) {
3586 // Check for Deprecated tag - 4276120
3587 if (attribute_length != 0) {
3588 classfile_parse_error(
3589 "Invalid Deprecated classfile attribute length %u in class file %s",
3590 attribute_length, THREAD);
3591 return;
3592 }
3593 } else if (_major_version >= JAVA_1_5_VERSION) {
3594 if (tag == vmSymbols::tag_signature()) {
3595 if (_generic_signature_index != 0) {
3596 classfile_parse_error(
3597 "Multiple Signature attributes in class file %s", THREAD);
3598 return;
3599 }
3600 if (attribute_length != 2) {
3601 classfile_parse_error(
3602 "Wrong Signature attribute length %u in class file %s",
3603 attribute_length, THREAD);
3604 return;
3605 }
3606 parse_classfile_signature_attribute(cfs, CHECK);
3607 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3608 if (runtime_visible_annotations != nullptr) {
3609 classfile_parse_error(
3610 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3611 return;
3612 }
3613 runtime_visible_annotations_length = attribute_length;
3614 runtime_visible_annotations = cfs->current();
3615 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3616 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3617 parse_annotations(cp,
3618 runtime_visible_annotations,
3619 runtime_visible_annotations_length,
3620 parsed_annotations,
3621 _loader_data,
3622 _can_access_vm_annotations);
3623 cfs->skip_u1_fast(runtime_visible_annotations_length);
3624 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3625 if (runtime_invisible_annotations_exists) {
3626 classfile_parse_error(
3627 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3628 return;
3629 }
3630 runtime_invisible_annotations_exists = true;
3631 cfs->skip_u1(attribute_length, CHECK);
3632 } else if (tag == vmSymbols::tag_enclosing_method()) {
3633 if (parsed_enclosingmethod_attribute) {
3634 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3635 return;
3636 } else {
3637 parsed_enclosingmethod_attribute = true;
3638 }
3639 guarantee_property(attribute_length == 4,
3640 "Wrong EnclosingMethod attribute length %u in class file %s",
3641 attribute_length, CHECK);
3642 cfs->guarantee_more(4, CHECK); // class_index, method_index
3643 enclosing_method_class_index = cfs->get_u2_fast();
3644 enclosing_method_method_index = cfs->get_u2_fast();
3645 if (enclosing_method_class_index == 0) {
3646 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3647 return;
3648 }
3649 // Validate the constant pool indices and types
3650 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3651 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3652 if (enclosing_method_method_index != 0 &&
3653 (!cp->is_within_bounds(enclosing_method_method_index) ||
3654 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3655 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3656 return;
3657 }
3658 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3659 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3660 if (parsed_bootstrap_methods_attribute) {
3661 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3662 return;
3663 }
3664 parsed_bootstrap_methods_attribute = true;
3665 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3666 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3667 if (runtime_visible_type_annotations != nullptr) {
3668 classfile_parse_error(
3669 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3670 return;
3671 }
3672 runtime_visible_type_annotations_length = attribute_length;
3673 runtime_visible_type_annotations = cfs->current();
3674 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3675 // No need for the VM to parse Type annotations
3676 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3677 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3678 if (runtime_invisible_type_annotations_exists) {
3679 classfile_parse_error(
3680 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3681 return;
3682 }
3683 runtime_invisible_type_annotations_exists = true;
3684 cfs->skip_u1(attribute_length, CHECK);
3685 } else if (_major_version >= JAVA_11_VERSION) {
3686 if (tag == vmSymbols::tag_nest_members()) {
3687 // Check for NestMembers tag
3688 if (parsed_nest_members_attribute) {
3689 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3690 return;
3691 } else {
3692 parsed_nest_members_attribute = true;
3693 }
3694 if (parsed_nest_host_attribute) {
3695 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3696 return;
3697 }
3698 nest_members_attribute_start = cfs->current();
3699 nest_members_attribute_length = attribute_length;
3700 cfs->skip_u1(nest_members_attribute_length, CHECK);
3701 } else if (tag == vmSymbols::tag_nest_host()) {
3702 if (parsed_nest_host_attribute) {
3703 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3704 return;
3705 } else {
3706 parsed_nest_host_attribute = true;
3707 }
3708 if (parsed_nest_members_attribute) {
3709 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3710 return;
3711 }
3712 if (_need_verify) {
3713 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3714 }
3715 cfs->guarantee_more(2, CHECK);
3716 u2 class_info_index = cfs->get_u2_fast();
3717 guarantee_property(
3718 valid_klass_reference_at(class_info_index),
3719 "Nest-host class_info_index %u has bad constant type in class file %s",
3720 class_info_index, CHECK);
3721 _nest_host = class_info_index;
3722
3723 } else if (_major_version >= JAVA_16_VERSION) {
3724 if (tag == vmSymbols::tag_record()) {
3725 if (parsed_record_attribute) {
3726 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3727 return;
3728 }
3729 parsed_record_attribute = true;
3730 record_attribute_start = cfs->current();
3731 record_attribute_length = attribute_length;
3732 } else if (_major_version >= JAVA_17_VERSION) {
3733 if (tag == vmSymbols::tag_permitted_subclasses()) {
3734 if (parsed_permitted_subclasses_attribute) {
3735 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3736 return;
3737 }
3738 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3739 if (_access_flags.is_final()) {
3740 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3741 return;
3742 }
3743 parsed_permitted_subclasses_attribute = true;
3744 permitted_subclasses_attribute_start = cfs->current();
3745 permitted_subclasses_attribute_length = attribute_length;
3746 }
3747 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3748 if (parsed_loadable_descriptors_attribute) {
3749 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3750 return;
3751 }
3752 parsed_loadable_descriptors_attribute = true;
3753 loadable_descriptors_attribute_start = cfs->current();
3754 loadable_descriptors_attribute_length = attribute_length;
3755 }
3756 }
3757 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3758 cfs->skip_u1(attribute_length, CHECK);
3759 } else {
3760 // Unknown attribute
3761 cfs->skip_u1(attribute_length, CHECK);
3762 }
3763 } else {
3764 // Unknown attribute
3765 cfs->skip_u1(attribute_length, CHECK);
3766 }
3767 } else {
3768 // Unknown attribute
3769 cfs->skip_u1(attribute_length, CHECK);
3770 }
3771 }
3772 _class_annotations = allocate_annotations(runtime_visible_annotations,
3773 runtime_visible_annotations_length,
3774 CHECK);
3775 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3776 runtime_visible_type_annotations_length,
3777 CHECK);
3778
3779 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3780 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3781 cfs,
3782 cp,
3783 inner_classes_attribute_start,
3784 parsed_innerclasses_attribute,
3785 enclosing_method_class_index,
3786 enclosing_method_method_index,
3787 CHECK);
3788 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3789 guarantee_property(
3790 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3791 "Wrong InnerClasses attribute length in class file %s", CHECK);
3792 }
3793 }
3794
3795 if (parsed_nest_members_attribute) {
3796 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3797 cfs,
3798 nest_members_attribute_start,
3799 CHECK);
3800 if (_need_verify) {
3801 guarantee_property(
3802 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3803 "Wrong NestMembers attribute length in class file %s", CHECK);
3804 }
3805 }
3806
3807 if (parsed_record_attribute) {
3808 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3809 cfs,
3810 cp,
3811 record_attribute_start,
3812 CHECK);
3813 if (_need_verify) {
3814 guarantee_property(record_attribute_length == calculated_attr_length,
3815 "Record attribute has wrong length in class file %s",
3816 CHECK);
3817 }
3818 }
3819
3820 if (parsed_permitted_subclasses_attribute) {
3821 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3822 cfs,
3823 permitted_subclasses_attribute_start,
3824 CHECK);
3825 if (_need_verify) {
3826 guarantee_property(
3827 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3828 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3829 }
3830 }
3831
3832 if (parsed_loadable_descriptors_attribute) {
3833 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3834 cfs,
3835 loadable_descriptors_attribute_start,
3836 CHECK);
3837 if (_need_verify) {
3838 guarantee_property(
3839 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3840 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3841 }
3842 }
3843
3844 if (_max_bootstrap_specifier_index >= 0) {
3845 guarantee_property(parsed_bootstrap_methods_attribute,
3846 "Missing BootstrapMethods attribute in class file %s", CHECK);
3847 }
3848 }
3849
3850 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3851 assert(k != nullptr, "invariant");
3852
3853 if (_synthetic_flag)
3854 k->set_is_synthetic();
3855 if (_sourcefile_index != 0) {
3856 k->set_source_file_name_index(_sourcefile_index);
3857 }
3858 if (_generic_signature_index != 0) {
3859 k->set_generic_signature_index(_generic_signature_index);
3860 }
3861 if (_sde_buffer != nullptr) {
3862 k->set_source_debug_extension(_sde_buffer, _sde_length);
3863 }
3864 }
3865
3866 // Create the Annotations object that will
3867 // hold the annotations array for the Klass.
3868 void ClassFileParser::create_combined_annotations(TRAPS) {
3869 if (_class_annotations == nullptr &&
3870 _class_type_annotations == nullptr &&
3871 _fields_annotations == nullptr &&
3872 _fields_type_annotations == nullptr) {
3873 // Don't create the Annotations object unnecessarily.
3874 return;
3875 }
3876
3877 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3878 annotations->set_class_annotations(_class_annotations);
3879 annotations->set_class_type_annotations(_class_type_annotations);
3880 annotations->set_fields_annotations(_fields_annotations);
3881 annotations->set_fields_type_annotations(_fields_type_annotations);
3882
3883 // This is the Annotations object that will be
3884 // assigned to InstanceKlass being constructed.
3885 _combined_annotations = annotations;
3886
3887 // The annotations arrays below has been transferred the
3888 // _combined_annotations so these fields can now be cleared.
3889 _class_annotations = nullptr;
3890 _class_type_annotations = nullptr;
3891 _fields_annotations = nullptr;
3892 _fields_type_annotations = nullptr;
3893 }
3894
3895 // Transfer ownership of metadata allocated to the InstanceKlass.
3896 void ClassFileParser::apply_parsed_class_metadata(
3897 InstanceKlass* this_klass,
3898 int java_fields_count) {
3899 assert(this_klass != nullptr, "invariant");
3900
3901 _cp->set_pool_holder(this_klass);
3902 this_klass->set_constants(_cp);
3903 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3904 this_klass->set_fields_status(_fields_status);
3905 this_klass->set_methods(_methods);
3906 this_klass->set_inner_classes(_inner_classes);
3907 this_klass->set_nest_members(_nest_members);
3908 this_klass->set_nest_host_index(_nest_host);
3909 this_klass->set_loadable_descriptors(_loadable_descriptors);
3910 this_klass->set_annotations(_combined_annotations);
3911 this_klass->set_permitted_subclasses(_permitted_subclasses);
3912 this_klass->set_record_components(_record_components);
3913 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3914 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3915 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3916 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3917 // its _super. If an OOM occurs while loading the current klass, its _super field
3918 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3919 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3920 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3921
3922 // Clear out these fields so they don't get deallocated by the destructor
3923 clear_class_metadata();
3924 }
3925
3926 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3927 int anno_length,
3928 TRAPS) {
3929 AnnotationArray* annotations = nullptr;
3930 if (anno != nullptr) {
3931 annotations = MetadataFactory::new_array<u1>(_loader_data,
3932 anno_length,
3933 CHECK_(annotations));
3934 for (int i = 0; i < anno_length; i++) {
3935 annotations->at_put(i, anno[i]);
3936 }
3937 }
3938 return annotations;
3939 }
3940
3941 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3942 const int super_class_index,
3943 const bool need_verify,
3944 TRAPS) {
3945 assert(cp != nullptr, "invariant");
3946 const InstanceKlass* super_klass = nullptr;
3947
3948 if (super_class_index == 0) {
3949 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3950 "Invalid superclass index 0 in class file %s",
3951 CHECK_NULL);
3952 } else {
3953 guarantee_property(valid_klass_reference_at(super_class_index),
3954 "Invalid superclass index %u in class file %s",
3955 super_class_index,
3956 CHECK_NULL);
3957 // The class name should be legal because it is checked when parsing constant pool.
3958 // However, make sure it is not an array type.
3959 if (cp->tag_at(super_class_index).is_klass()) {
3960 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3961 }
3962 if (need_verify) {
3963 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3964 guarantee_property(!is_array,
3965 "Bad superclass name in class file %s", CHECK_NULL);
3966 }
3967 }
3968 return super_klass;
3969 }
3970
3971 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3972 _max_nonstatic_oop_maps = max_blocks;
3973 _nonstatic_oop_map_count = 0;
3974 if (max_blocks == 0) {
3975 _nonstatic_oop_maps = nullptr;
3976 } else {
3977 _nonstatic_oop_maps =
3978 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3979 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3980 }
3981 }
3982
3983 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3984 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3985 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3986 }
3987
3988 // addition of super oop maps
3989 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3990 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3991 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3992
3993 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3994 _nonstatic_oop_map_count += nof_blocks;
3995 }
3996
3997 // collection of oops
3998 void OopMapBlocksBuilder::add(int offset, int count) {
3999 if (_nonstatic_oop_map_count == 0) {
4000 _nonstatic_oop_map_count++;
4001 }
4002 OopMapBlock* nonstatic_oop_map = last_oop_map();
4003 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4004 nonstatic_oop_map->set_offset(offset);
4005 nonstatic_oop_map->set_count(count);
4006 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4007 nonstatic_oop_map->increment_count(count);
4008 } else { // Need a new one...
4009 _nonstatic_oop_map_count++;
4010 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4011 nonstatic_oop_map = last_oop_map();
4012 nonstatic_oop_map->set_offset(offset);
4013 nonstatic_oop_map->set_count(count);
4014 }
4015 }
4016
4017 // general purpose copy, e.g. into allocated instanceKlass
4018 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4019 if (_nonstatic_oop_map_count != 0) {
4020 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4021 }
4022 }
4023
4024 // Sort and compact adjacent blocks
4025 void OopMapBlocksBuilder::compact() {
4026 if (_nonstatic_oop_map_count <= 1) {
4027 return;
4028 }
4029 /*
4030 * Since field layout sneaks in oops before values, we will be able to condense
4031 * blocks. There is potential to compact between super, own refs and values
4032 * containing refs.
4033 *
4034 * Currently compaction is slightly limited due to values being 8 byte aligned.
4035 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4036 * and maybe it doesn't need to be.
4037 */
4038 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4039 (_sort_Fn)OopMapBlock::compare_offset);
4040 if (_nonstatic_oop_map_count < 2) {
4041 return;
4042 }
4043
4044 // Make a temp copy, and iterate through and copy back into the original
4045 ResourceMark rm;
4046 OopMapBlock* oop_maps_copy =
4047 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4048 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4049 copy(oop_maps_copy);
4050 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4051 unsigned int new_count = 1;
4052 oop_maps_copy++;
4053 while(oop_maps_copy < oop_maps_copy_end) {
4054 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4055 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4056 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4057 } else {
4058 nonstatic_oop_map++;
4059 new_count++;
4060 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4061 nonstatic_oop_map->set_count(oop_maps_copy->count());
4062 }
4063 oop_maps_copy++;
4064 }
4065 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4066 _nonstatic_oop_map_count = new_count;
4067 }
4068
4069 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4070 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4071 if (_nonstatic_oop_map_count > 0) {
4072 OopMapBlock* map = _nonstatic_oop_maps;
4073 OopMapBlock* last_map = last_oop_map();
4074 assert(map <= last_map, "Last less than first");
4075 while (map <= last_map) {
4076 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4077 map->offset() + map->offset_span() - heapOopSize, map->count());
4078 map++;
4079 }
4080 }
4081 }
4082
4083 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4084 print_on(st);
4085 }
4086
4087 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4088 assert(ik != nullptr, "invariant");
4089
4090 const InstanceKlass* const super = ik->java_super();
4091
4092 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4093 // in which case we don't have to register objects as finalizable
4094 if (!_has_empty_finalizer) {
4095 if (_has_finalizer ||
4096 (super != nullptr && super->has_finalizer())) {
4097 ik->set_has_finalizer();
4098 }
4099 }
4100
4101 #ifdef ASSERT
4102 bool f = false;
4103 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4104 vmSymbols::void_method_signature());
4105 if (InstanceKlass::is_finalization_enabled() &&
4106 (m != nullptr) && !m->is_empty_method()) {
4107 f = true;
4108 }
4109
4110 // Spec doesn't prevent agent from redefinition of empty finalizer.
4111 // Despite the fact that it's generally bad idea and redefined finalizer
4112 // will not work as expected we shouldn't abort vm in this case
4113 if (!ik->has_redefined_this_or_super()) {
4114 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4115 }
4116 #endif
4117
4118 // Check if this klass supports the java.lang.Cloneable interface
4119 if (vmClasses::Cloneable_klass_loaded()) {
4120 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4121 ik->set_is_cloneable();
4122 }
4123 }
4124
4125 // If it cannot be fast-path allocated, set a bit in the layout helper.
4126 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4127 assert(ik->size_helper() > 0, "layout_helper is initialized");
4128 if (ik->is_abstract() || ik->is_interface()
4129 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4130 || ik->size_helper() >= FastAllocateSizeLimit) {
4131 // Forbid fast-path allocation.
4132 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4133 ik->set_layout_helper(lh);
4134 }
4135 }
4136
4137 bool ClassFileParser::supports_inline_types() const {
4138 // Inline types are only supported by class file version 68.65535 and later
4139 return _major_version > JAVA_24_VERSION ||
4140 (_major_version == JAVA_24_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4141 }
4142
4143 // utility methods for appending an array with check for duplicates
4144
4145 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4146 const Array<InstanceKlass*>* const ifs) {
4147 // iterate over new interfaces
4148 for (int i = 0; i < ifs->length(); i++) {
4149 InstanceKlass* const e = ifs->at(i);
4150 assert(e->is_klass() && e->is_interface(), "just checking");
4151 // add new interface
4152 result->append_if_missing(e);
4153 }
4154 }
4155
4156 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4157 Array<InstanceKlass*>* local_ifs,
4158 ClassLoaderData* loader_data,
4159 TRAPS) {
4160 assert(local_ifs != nullptr, "invariant");
4161 assert(loader_data != nullptr, "invariant");
4162
4163 // Compute maximum size for transitive interfaces
4164 int max_transitive_size = 0;
4165 int super_size = 0;
4166 // Add superclass transitive interfaces size
4167 if (super != nullptr) {
4168 super_size = super->transitive_interfaces()->length();
4169 max_transitive_size += super_size;
4170 }
4171 // Add local interfaces' super interfaces
4172 const int local_size = local_ifs->length();
4173 for (int i = 0; i < local_size; i++) {
4174 InstanceKlass* const l = local_ifs->at(i);
4175 max_transitive_size += l->transitive_interfaces()->length();
4176 }
4177 // Finally add local interfaces
4178 max_transitive_size += local_size;
4179 // Construct array
4180 if (max_transitive_size == 0) {
4181 // no interfaces, use canonicalized array
4182 return Universe::the_empty_instance_klass_array();
4183 } else if (max_transitive_size == super_size) {
4184 // no new local interfaces added, share superklass' transitive interface array
4185 return super->transitive_interfaces();
4186 // The three lines below are commented to work around bug JDK-8245487
4187 // } else if (max_transitive_size == local_size) {
4188 // // only local interfaces added, share local interface array
4189 // return local_ifs;
4190 } else {
4191 ResourceMark rm;
4192 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4193
4194 // Copy down from superclass
4195 if (super != nullptr) {
4196 append_interfaces(result, super->transitive_interfaces());
4197 }
4198
4199 // Copy down from local interfaces' superinterfaces
4200 for (int i = 0; i < local_size; i++) {
4201 InstanceKlass* const l = local_ifs->at(i);
4202 append_interfaces(result, l->transitive_interfaces());
4203 }
4204 // Finally add local interfaces
4205 append_interfaces(result, local_ifs);
4206
4207 // length will be less than the max_transitive_size if duplicates were removed
4208 const int length = result->length();
4209 assert(length <= max_transitive_size, "just checking");
4210
4211 Array<InstanceKlass*>* const new_result =
4212 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4213 for (int i = 0; i < length; i++) {
4214 InstanceKlass* const e = result->at(i);
4215 assert(e != nullptr, "just checking");
4216 new_result->at_put(i, e);
4217 }
4218 return new_result;
4219 }
4220 }
4221
4222 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4223 assert(this_klass != nullptr, "invariant");
4224 const Klass* const super = this_klass->super();
4225
4226 if (super != nullptr) {
4227 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4228
4229 if (super->is_final()) {
4230 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4231 return;
4232 }
4233
4234 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4235 classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4236 return;
4237 }
4238
4239 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4240 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4241 // for a value classes. So, it is treated as a special case for now.
4242 if (!this_klass->access_flags().is_identity_class() &&
4243 super_ik->name() != vmSymbols::java_lang_Object() &&
4244 super_ik->is_identity_class()) {
4245 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4246 return;
4247 }
4248
4249 Reflection::VerifyClassAccessResults vca_result =
4250 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4251 if (vca_result != Reflection::ACCESS_OK) {
4252 ResourceMark rm(THREAD);
4253 char* msg = Reflection::verify_class_access_msg(this_klass,
4254 InstanceKlass::cast(super),
4255 vca_result);
4256 if (msg == nullptr) {
4257 bool same_module = (this_klass->module() == super->module());
4258 Exceptions::fthrow(
4259 THREAD_AND_LOCATION,
4260 vmSymbols::java_lang_IllegalAccessError(),
4261 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4262 this_klass->external_name(),
4263 super->is_abstract() ? "abstract " : "",
4264 super->external_name(),
4265 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4266 (same_module) ? "" : "; ",
4267 (same_module) ? "" : super->class_in_module_of_loader());
4268 } else {
4269 // Add additional message content.
4270 Exceptions::fthrow(
4271 THREAD_AND_LOCATION,
4272 vmSymbols::java_lang_IllegalAccessError(),
4273 "superclass access check failed: %s",
4274 msg);
4275 }
4276 }
4277 }
4278 }
4279
4280
4281 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4282 assert(this_klass != nullptr, "invariant");
4283 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4284 const int lng = local_interfaces->length();
4285 for (int i = lng - 1; i >= 0; i--) {
4286 InstanceKlass* const k = local_interfaces->at(i);
4287 assert (k != nullptr && k->is_interface(), "invalid interface");
4288
4289 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4290 classfile_icce_error(this_klass->is_interface() ?
4291 "class %s cannot extend sealed interface %s" :
4292 "class %s cannot implement sealed interface %s",
4293 k, THREAD);
4294 return;
4295 }
4296
4297 Reflection::VerifyClassAccessResults vca_result =
4298 Reflection::verify_class_access(this_klass, k, false);
4299 if (vca_result != Reflection::ACCESS_OK) {
4300 ResourceMark rm(THREAD);
4301 char* msg = Reflection::verify_class_access_msg(this_klass,
4302 k,
4303 vca_result);
4304 if (msg == nullptr) {
4305 bool same_module = (this_klass->module() == k->module());
4306 Exceptions::fthrow(
4307 THREAD_AND_LOCATION,
4308 vmSymbols::java_lang_IllegalAccessError(),
4309 "class %s cannot access its superinterface %s (%s%s%s)",
4310 this_klass->external_name(),
4311 k->external_name(),
4312 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4313 (same_module) ? "" : "; ",
4314 (same_module) ? "" : k->class_in_module_of_loader());
4315 return;
4316 } else {
4317 // Add additional message content.
4318 Exceptions::fthrow(
4319 THREAD_AND_LOCATION,
4320 vmSymbols::java_lang_IllegalAccessError(),
4321 "superinterface check failed: %s",
4322 msg);
4323 return;
4324 }
4325 }
4326 }
4327 }
4328
4329
4330 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4331 assert(this_klass != nullptr, "invariant");
4332 const Array<Method*>* const methods = this_klass->methods();
4333 const int num_methods = methods->length();
4334
4335 // go thru each method and check if it overrides a final method
4336 for (int index = 0; index < num_methods; index++) {
4337 const Method* const m = methods->at(index);
4338
4339 // skip private, static, and <init> methods
4340 if ((!m->is_private() && !m->is_static()) &&
4341 (m->name() != vmSymbols::object_initializer_name())) {
4342
4343 const Symbol* const name = m->name();
4344 const Symbol* const signature = m->signature();
4345 const InstanceKlass* k = this_klass->java_super();
4346 const Method* super_m = nullptr;
4347 while (k != nullptr) {
4348 // skip supers that don't have final methods.
4349 if (k->has_final_method()) {
4350 // lookup a matching method in the super class hierarchy
4351 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4352 if (super_m == nullptr) {
4353 break; // didn't find any match; get out
4354 }
4355
4356 if (super_m->is_final() && !super_m->is_static() &&
4357 !super_m->access_flags().is_private()) {
4358 // matching method in super is final, and not static or private
4359 bool can_access = Reflection::verify_member_access(this_klass,
4360 super_m->method_holder(),
4361 super_m->method_holder(),
4362 super_m->access_flags(),
4363 false, false, CHECK);
4364 if (can_access) {
4365 // this class can access super final method and therefore override
4366 ResourceMark rm(THREAD);
4367 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4368 err_msg("class %s overrides final method %s.%s%s",
4369 this_klass->external_name(),
4370 super_m->method_holder()->external_name(),
4371 name->as_C_string(),
4372 signature->as_C_string()));
4373 }
4374 }
4375
4376 // continue to look from super_m's holder's super.
4377 k = super_m->method_holder()->java_super();
4378 continue;
4379 }
4380
4381 k = k->java_super();
4382 }
4383 }
4384 }
4385 }
4386
4387
4388 // assumes that this_klass is an interface
4389 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4390 assert(this_klass != nullptr, "invariant");
4391 assert(this_klass->is_interface(), "not an interface");
4392 const Array<Method*>* methods = this_klass->methods();
4393 const int num_methods = methods->length();
4394
4395 for (int index = 0; index < num_methods; index++) {
4396 const Method* const m = methods->at(index);
4397 // if m is static and not the init method, throw a verify error
4398 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4399 ResourceMark rm(THREAD);
4400 Exceptions::fthrow(
4401 THREAD_AND_LOCATION,
4402 vmSymbols::java_lang_VerifyError(),
4403 "Illegal static method %s in interface %s",
4404 m->name()->as_C_string(),
4405 this_klass->external_name()
4406 );
4407 return;
4408 }
4409 }
4410 }
4411
4412 // utility methods for format checking
4413
4414 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4415 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4416 const bool is_inner_class = name != nullptr;
4417 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4418 if (is_module) {
4419 ResourceMark rm(THREAD);
4420 Exceptions::fthrow(
4421 THREAD_AND_LOCATION,
4422 vmSymbols::java_lang_NoClassDefFoundError(),
4423 "%s is not a class because access_flag ACC_MODULE is set",
4424 _class_name->as_C_string());
4425 return;
4426 }
4427
4428 if (!_need_verify) { return; }
4429
4430 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4431 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4432 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4433 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4434 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4435 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4436 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4437 const bool valid_value_class = is_identity || is_interface ||
4438 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4439
4440 if ((is_abstract && is_final) ||
4441 (is_interface && !is_abstract) ||
4442 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4443 (!is_interface && major_gte_1_5 && is_annotation) ||
4444 (!valid_value_class)) {
4445 ResourceMark rm(THREAD);
4446 const char* class_note = "";
4447 if (!valid_value_class) {
4448 class_note = " (a value class must be final or else abstract)";
4449 }
4450 if (name == nullptr) { // Not an inner class
4451 Exceptions::fthrow(
4452 THREAD_AND_LOCATION,
4453 vmSymbols::java_lang_ClassFormatError(),
4454 "Illegal class modifiers in class %s%s: 0x%X",
4455 _class_name->as_C_string(), class_note, flags
4456 );
4457 return;
4458 } else {
4459 Exceptions::fthrow(
4460 THREAD_AND_LOCATION,
4461 vmSymbols::java_lang_ClassFormatError(),
4462 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4463 name, class_note, _class_name->as_C_string(), flags
4464 );
4465 return;
4466 }
4467 }
4468 }
4469
4470 static bool has_illegal_visibility(jint flags) {
4471 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4472 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4473 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4474
4475 return ((is_public && is_protected) ||
4476 (is_public && is_private) ||
4477 (is_protected && is_private));
4478 }
4479
4480 // A legal major_version.minor_version must be one of the following:
4481 //
4482 // Major_version >= 45 and major_version < 56, any minor_version.
4483 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4484 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4485 //
4486 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4487 ResourceMark rm(THREAD);
4488 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4489 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4490 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4491 class_name, major, minor, THREAD);
4492 return;
4493 }
4494
4495 if (major > max_version) {
4496 Exceptions::fthrow(
4497 THREAD_AND_LOCATION,
4498 vmSymbols::java_lang_UnsupportedClassVersionError(),
4499 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4500 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4501 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4502 return;
4503 }
4504
4505 if (major < JAVA_12_VERSION || minor == 0) {
4506 return;
4507 }
4508
4509 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4510 if (major != max_version) {
4511 Exceptions::fthrow(
4512 THREAD_AND_LOCATION,
4513 vmSymbols::java_lang_UnsupportedClassVersionError(),
4514 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4515 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4516 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4517 return;
4518 }
4519
4520 if (!Arguments::enable_preview()) {
4521 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4522 class_name, major, minor, THREAD);
4523 return;
4524 }
4525
4526 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4527 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4528 class_name, major, minor, THREAD);
4529 }
4530 }
4531
4532 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4533 AccessFlags class_access_flags,
4534 TRAPS) const {
4535 if (!_need_verify) { return; }
4536
4537 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4538 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4539 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4540 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4541 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4542 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4543 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4544 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4545 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4546 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4547
4548 const bool is_interface = class_access_flags.is_interface();
4549 const bool is_identity_class = class_access_flags.is_identity_class();
4550
4551 bool is_illegal = false;
4552 const char* error_msg = "";
4553
4554 // There is some overlap in the checks that apply, for example interface fields
4555 // must be static, static fields can't be strict, and therefore interfaces can't
4556 // have strict fields. So we don't have to check every possible invalid combination
4557 // individually as long as all are covered. Once we have found an illegal combination
4558 // we can stop checking.
4559
4560 if (supports_inline_types()) {
4561 if (is_strict && is_static) {
4562 is_illegal = true;
4563 error_msg = "field cannot be strict and static";
4564 }
4565 else if (is_strict && !is_final) {
4566 is_illegal = true;
4567 error_msg = "strict field must be final";
4568 }
4569 }
4570
4571 if (!is_illegal) {
4572 if (is_interface) {
4573 if (!is_public || !is_static || !is_final || is_private ||
4574 is_protected || is_volatile || is_transient ||
4575 (major_gte_1_5 && is_enum)) {
4576 is_illegal = true;
4577 error_msg = "interface fields must be public, static and final, and may be synthetic";
4578 }
4579 } else { // not interface
4580 if (has_illegal_visibility(flags)) {
4581 is_illegal = true;
4582 error_msg = "invalid visibility flags for class field";
4583 } else if (is_final && is_volatile) {
4584 is_illegal = true;
4585 error_msg = "fields cannot be final and volatile";
4586 } else if (supports_inline_types()) {
4587 if (!is_identity_class && !is_static && !is_strict) {
4588 is_illegal = true;
4589 error_msg = "value class fields must be either strict or static";
4590 }
4591 }
4592 }
4593 }
4594
4595 if (is_illegal) {
4596 ResourceMark rm(THREAD);
4597 Exceptions::fthrow(
4598 THREAD_AND_LOCATION,
4599 vmSymbols::java_lang_ClassFormatError(),
4600 "Illegal field modifiers (%s) in class %s: 0x%X",
4601 error_msg, _class_name->as_C_string(), flags);
4602 return;
4603 }
4604 }
4605
4606 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4607 AccessFlags class_access_flags,
4608 const Symbol* name,
4609 TRAPS) const {
4610 if (!_need_verify) { return; }
4611
4612 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4613 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4614 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4615 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4616 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4617 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4618 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4619 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4620 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4621 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4622 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4623 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4624 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4625 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4626 // LW401 CR required: removal of value factories support
4627 const bool is_interface = class_access_flags.is_interface();
4628 const bool is_identity_class = class_access_flags.is_identity_class();
4629 const bool is_abstract_class = class_access_flags.is_abstract();
4630
4631 bool is_illegal = false;
4632
4633 const char* class_note = "";
4634 if (is_interface) {
4635 if (major_gte_8) {
4636 // Class file version is JAVA_8_VERSION or later Methods of
4637 // interfaces may set any of the flags except ACC_PROTECTED,
4638 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4639 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4640 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4641 (is_native || is_protected || is_final || is_synchronized) ||
4642 // If a specific method of a class or interface has its
4643 // ACC_ABSTRACT flag set, it must not have any of its
4644 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4645 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4646 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4647 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4648 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4649 is_illegal = true;
4650 }
4651 } else if (major_gte_1_5) {
4652 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4653 if (!is_public || is_private || is_protected || is_static || is_final ||
4654 is_synchronized || is_native || !is_abstract || is_strict) {
4655 is_illegal = true;
4656 }
4657 } else {
4658 // Class file version is pre-JAVA_1_5_VERSION
4659 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4660 is_illegal = true;
4661 }
4662 }
4663 } else { // not interface
4664 if (has_illegal_visibility(flags)) {
4665 is_illegal = true;
4666 } else {
4667 if (is_initializer) {
4668 if (is_static || is_final || is_synchronized || is_native ||
4669 is_abstract || (major_gte_1_5 && is_bridge)) {
4670 is_illegal = true;
4671 }
4672 } else { // not initializer
4673 if (!is_identity_class && is_synchronized && !is_static) {
4674 is_illegal = true;
4675 class_note = " (not an identity class)";
4676 } else {
4677 if (is_abstract) {
4678 if ((is_final || is_native || is_private || is_static ||
4679 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4680 is_illegal = true;
4681 }
4682 }
4683 }
4684 }
4685 }
4686 }
4687
4688 if (is_illegal) {
4689 ResourceMark rm(THREAD);
4690 Exceptions::fthrow(
4691 THREAD_AND_LOCATION,
4692 vmSymbols::java_lang_ClassFormatError(),
4693 "Method %s in class %s%s has illegal modifiers: 0x%X",
4694 name->as_C_string(), _class_name->as_C_string(),
4695 class_note, flags);
4696 return;
4697 }
4698 }
4699
4700 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4701 int length,
4702 TRAPS) const {
4703 assert(_need_verify, "only called when _need_verify is true");
4704 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4705 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4706 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4707 }
4708 }
4709
4710 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4711 // In class names, '/' separates unqualified names. This is verified in this function also.
4712 // Method names also may not contain the characters '<' or '>', unless <init>
4713 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4714 // method. Because these names have been checked as special cases before
4715 // calling this method in verify_legal_method_name.
4716 //
4717 // This method is also called from the modular system APIs in modules.cpp
4718 // to verify the validity of module and package names.
4719 bool ClassFileParser::verify_unqualified_name(const char* name,
4720 unsigned int length,
4721 int type) {
4722 if (length == 0) return false; // Must have at least one char.
4723 for (const char* p = name; p != name + length; p++) {
4724 switch(*p) {
4725 case JVM_SIGNATURE_DOT:
4726 case JVM_SIGNATURE_ENDCLASS:
4727 case JVM_SIGNATURE_ARRAY:
4728 // do not permit '.', ';', or '['
4729 return false;
4730 case JVM_SIGNATURE_SLASH:
4731 // check for '//' or leading or trailing '/' which are not legal
4732 // unqualified name must not be empty
4733 if (type == ClassFileParser::LegalClass) {
4734 if (p == name || p+1 >= name+length ||
4735 *(p+1) == JVM_SIGNATURE_SLASH) {
4736 return false;
4737 }
4738 } else {
4739 return false; // do not permit '/' unless it's class name
4740 }
4741 break;
4742 case JVM_SIGNATURE_SPECIAL:
4743 case JVM_SIGNATURE_ENDSPECIAL:
4744 // do not permit '<' or '>' in method names
4745 if (type == ClassFileParser::LegalMethod) {
4746 return false;
4747 }
4748 }
4749 }
4750 return true;
4751 }
4752
4753 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4754 if (_loadable_descriptors == nullptr) return false;
4755 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4756 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4757 if (class_name == klass) return true;
4758 }
4759 return false;
4760 }
4761
4762 // Take pointer to a UTF8 byte string (not NUL-terminated).
4763 // Skip over the longest part of the string that could
4764 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4765 // Return a pointer to just past the fieldname.
4766 // Return null if no fieldname at all was found, or in the case of slash_ok
4767 // being true, we saw consecutive slashes (meaning we were looking for a
4768 // qualified path but found something that was badly-formed).
4769 static const char* skip_over_field_name(const char* const name,
4770 bool slash_ok,
4771 unsigned int length) {
4772 const char* p;
4773 jboolean last_is_slash = false;
4774 jboolean not_first_ch = false;
4775
4776 for (p = name; p != name + length; not_first_ch = true) {
4777 const char* old_p = p;
4778 jchar ch = *p;
4779 if (ch < 128) {
4780 p++;
4781 // quick check for ascii
4782 if ((ch >= 'a' && ch <= 'z') ||
4783 (ch >= 'A' && ch <= 'Z') ||
4784 (ch == '_' || ch == '$') ||
4785 (not_first_ch && ch >= '0' && ch <= '9')) {
4786 last_is_slash = false;
4787 continue;
4788 }
4789 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4790 if (last_is_slash) {
4791 return nullptr; // Don't permit consecutive slashes
4792 }
4793 last_is_slash = true;
4794 continue;
4795 }
4796 }
4797 else {
4798 jint unicode_ch;
4799 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4800 p = tmp_p;
4801 last_is_slash = false;
4802 // Check if ch is Java identifier start or is Java identifier part
4803 // 4672820: call java.lang.Character methods directly without generating separate tables.
4804 EXCEPTION_MARK;
4805 // return value
4806 JavaValue result(T_BOOLEAN);
4807 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4808 JavaCallArguments args;
4809 args.push_int(unicode_ch);
4810
4811 if (not_first_ch) {
4812 // public static boolean isJavaIdentifierPart(char ch);
4813 JavaCalls::call_static(&result,
4814 vmClasses::Character_klass(),
4815 vmSymbols::isJavaIdentifierPart_name(),
4816 vmSymbols::int_bool_signature(),
4817 &args,
4818 THREAD);
4819 } else {
4820 // public static boolean isJavaIdentifierStart(char ch);
4821 JavaCalls::call_static(&result,
4822 vmClasses::Character_klass(),
4823 vmSymbols::isJavaIdentifierStart_name(),
4824 vmSymbols::int_bool_signature(),
4825 &args,
4826 THREAD);
4827 }
4828 if (HAS_PENDING_EXCEPTION) {
4829 CLEAR_PENDING_EXCEPTION;
4830 return nullptr;
4831 }
4832 if(result.get_jboolean()) {
4833 continue;
4834 }
4835 }
4836 return (not_first_ch) ? old_p : nullptr;
4837 }
4838 return (not_first_ch && !last_is_slash) ? p : nullptr;
4839 }
4840
4841 // Take pointer to a UTF8 byte string (not NUL-terminated).
4842 // Skip over the longest part of the string that could
4843 // be taken as a field signature. Allow "void" if void_ok.
4844 // Return a pointer to just past the signature.
4845 // Return null if no legal signature is found.
4846 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4847 bool void_ok,
4848 unsigned int length,
4849 TRAPS) const {
4850 unsigned int array_dim = 0;
4851 while (length > 0) {
4852 switch (signature[0]) {
4853 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4854 case JVM_SIGNATURE_BOOLEAN:
4855 case JVM_SIGNATURE_BYTE:
4856 case JVM_SIGNATURE_CHAR:
4857 case JVM_SIGNATURE_SHORT:
4858 case JVM_SIGNATURE_INT:
4859 case JVM_SIGNATURE_FLOAT:
4860 case JVM_SIGNATURE_LONG:
4861 case JVM_SIGNATURE_DOUBLE:
4862 return signature + 1;
4863 case JVM_SIGNATURE_CLASS:
4864 {
4865 if (_major_version < JAVA_1_5_VERSION) {
4866 // Skip over the class name if one is there
4867 const char* const p = skip_over_field_name(signature + 1, true, --length);
4868
4869 // The next character better be a semicolon
4870 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4871 return p + 1;
4872 }
4873 }
4874 else {
4875 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4876 signature++;
4877 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4878 // Format check signature
4879 if (c != nullptr) {
4880 int newlen = pointer_delta_as_int(c, (char*) signature);
4881 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4882 if (!legal) {
4883 classfile_parse_error("Class name is empty or contains illegal character "
4884 "in descriptor in class file %s",
4885 THREAD);
4886 return nullptr;
4887 }
4888 return signature + newlen + 1;
4889 }
4890 }
4891 return nullptr;
4892 }
4893 case JVM_SIGNATURE_ARRAY:
4894 array_dim++;
4895 if (array_dim > 255) {
4896 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4897 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4898 return nullptr;
4899 }
4900 // The rest of what's there better be a legal signature
4901 signature++;
4902 length--;
4903 void_ok = false;
4904 break;
4905 default:
4906 return nullptr;
4907 }
4908 }
4909 return nullptr;
4910 }
4911
4912 // Checks if name is a legal class name.
4913 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4914 if (!_need_verify || _relax_verify) { return; }
4915
4916 assert(name->refcount() > 0, "symbol must be kept alive");
4917 char* bytes = (char*)name->bytes();
4918 unsigned int length = name->utf8_length();
4919 bool legal = false;
4920
4921 if (length > 0) {
4922 const char* p;
4923 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4924 p = skip_over_field_signature(bytes, false, length, CHECK);
4925 legal = (p != nullptr) && ((p - bytes) == (int)length);
4926 } else if (_major_version < JAVA_1_5_VERSION) {
4927 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4928 p = skip_over_field_name(bytes, true, length);
4929 legal = (p != nullptr) && ((p - bytes) == (int)length);
4930 }
4931 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4932 && bytes[length - 1] == ';' ) {
4933 // Support for L...; descriptors
4934 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4935 } else {
4936 // 4900761: relax the constraints based on JSR202 spec
4937 // Class names may be drawn from the entire Unicode character set.
4938 // Identifiers between '/' must be unqualified names.
4939 // The utf8 string has been verified when parsing cpool entries.
4940 legal = verify_unqualified_name(bytes, length, LegalClass);
4941 }
4942 }
4943 if (!legal) {
4944 ResourceMark rm(THREAD);
4945 assert(_class_name != nullptr, "invariant");
4946 Exceptions::fthrow(
4947 THREAD_AND_LOCATION,
4948 vmSymbols::java_lang_ClassFormatError(),
4949 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4950 _class_name->as_C_string()
4951 );
4952 return;
4953 }
4954 }
4955
4956 // Checks if name is a legal field name.
4957 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4958 if (!_need_verify || _relax_verify) { return; }
4959
4960 char* bytes = (char*)name->bytes();
4961 unsigned int length = name->utf8_length();
4962 bool legal = false;
4963
4964 if (length > 0) {
4965 if (_major_version < JAVA_1_5_VERSION) {
4966 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4967 const char* p = skip_over_field_name(bytes, false, length);
4968 legal = (p != nullptr) && ((p - bytes) == (int)length);
4969 }
4970 } else {
4971 // 4881221: relax the constraints based on JSR202 spec
4972 legal = verify_unqualified_name(bytes, length, LegalField);
4973 }
4974 }
4975
4976 if (!legal) {
4977 ResourceMark rm(THREAD);
4978 assert(_class_name != nullptr, "invariant");
4979 Exceptions::fthrow(
4980 THREAD_AND_LOCATION,
4981 vmSymbols::java_lang_ClassFormatError(),
4982 "Illegal field name \"%.*s\" in class %s", length, bytes,
4983 _class_name->as_C_string()
4984 );
4985 return;
4986 }
4987 }
4988
4989 // Checks if name is a legal method name.
4990 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4991 if (!_need_verify || _relax_verify) { return; }
4992
4993 assert(name != nullptr, "method name is null");
4994 char* bytes = (char*)name->bytes();
4995 unsigned int length = name->utf8_length();
4996 bool legal = false;
4997
4998 if (length > 0) {
4999 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5000 if (name == vmSymbols::object_initializer_name() ||
5001 name == vmSymbols::class_initializer_name()) {
5002 legal = true;
5003 }
5004 } else if (_major_version < JAVA_1_5_VERSION) {
5005 const char* p;
5006 p = skip_over_field_name(bytes, false, length);
5007 legal = (p != nullptr) && ((p - bytes) == (int)length);
5008 } else {
5009 // 4881221: relax the constraints based on JSR202 spec
5010 legal = verify_unqualified_name(bytes, length, LegalMethod);
5011 }
5012 }
5013
5014 if (!legal) {
5015 ResourceMark rm(THREAD);
5016 assert(_class_name != nullptr, "invariant");
5017 Exceptions::fthrow(
5018 THREAD_AND_LOCATION,
5019 vmSymbols::java_lang_ClassFormatError(),
5020 "Illegal method name \"%.*s\" in class %s", length, bytes,
5021 _class_name->as_C_string()
5022 );
5023 return;
5024 }
5025 }
5026
5027 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5028 const char* const bytes = (const char*)signature->bytes();
5029 const unsigned int length = signature->utf8_length();
5030 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5031
5032 if (p == nullptr || (p - bytes) != (int)length) {
5033 return false;
5034 }
5035 return true;
5036 }
5037
5038 // Checks if signature is a legal field signature.
5039 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5040 const Symbol* signature,
5041 TRAPS) const {
5042 if (!_need_verify) { return; }
5043
5044 const char* const bytes = (const char*)signature->bytes();
5045 const unsigned int length = signature->utf8_length();
5046 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5047
5048 if (p == nullptr || (p - bytes) != (int)length) {
5049 throwIllegalSignature("Field", name, signature, CHECK);
5050 }
5051 }
5052
5053 // Check that the signature is compatible with the method name. For example,
5054 // check that <init> has a void signature.
5055 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5056 const Symbol* signature,
5057 TRAPS) const {
5058 if (!_need_verify) {
5059 return;
5060 }
5061
5062 // Class initializers cannot have args for class format version >= 51.
5063 if (name == vmSymbols::class_initializer_name() &&
5064 signature != vmSymbols::void_method_signature() &&
5065 _major_version >= JAVA_7_VERSION) {
5066 throwIllegalSignature("Method", name, signature, THREAD);
5067 return;
5068 }
5069
5070 int sig_length = signature->utf8_length();
5071 if (name->utf8_length() > 0 &&
5072 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5073 sig_length > 0 &&
5074 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5075 throwIllegalSignature("Method", name, signature, THREAD);
5076 }
5077 }
5078
5079 // Checks if signature is a legal method signature.
5080 // Returns number of parameters
5081 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5082 const Symbol* signature,
5083 TRAPS) const {
5084 if (!_need_verify) {
5085 // make sure caller's args_size will be less than 0 even for non-static
5086 // method so it will be recomputed in compute_size_of_parameters().
5087 return -2;
5088 }
5089
5090 unsigned int args_size = 0;
5091 const char* p = (const char*)signature->bytes();
5092 unsigned int length = signature->utf8_length();
5093 const char* nextp;
5094
5095 // The first character must be a '('
5096 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5097 length--;
5098 // Skip over legal field signatures
5099 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5100 while ((length > 0) && (nextp != nullptr)) {
5101 args_size++;
5102 if (p[0] == 'J' || p[0] == 'D') {
5103 args_size++;
5104 }
5105 length -= pointer_delta_as_int(nextp, p);
5106 p = nextp;
5107 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5108 }
5109 // The first non-signature thing better be a ')'
5110 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5111 length--;
5112 // Now we better just have a return value
5113 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5114 if (nextp && ((int)length == (nextp - p))) {
5115 return args_size;
5116 }
5117 }
5118 }
5119 // Report error
5120 throwIllegalSignature("Method", name, signature, THREAD);
5121 return 0;
5122 }
5123
5124 int ClassFileParser::static_field_size() const {
5125 assert(_layout_info != nullptr, "invariant");
5126 return _layout_info->_static_field_size;
5127 }
5128
5129 int ClassFileParser::total_oop_map_count() const {
5130 assert(_layout_info != nullptr, "invariant");
5131 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5132 }
5133
5134 jint ClassFileParser::layout_size() const {
5135 assert(_layout_info != nullptr, "invariant");
5136 return _layout_info->_instance_size;
5137 }
5138
5139 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5140 const Array<Method*>* methods) {
5141 assert(ik != nullptr, "invariant");
5142 assert(methods != nullptr, "invariant");
5143
5144 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5145 // (We used to do this lazily, but now we query it in Rewriter,
5146 // which is eagerly done for every method, so we might as well do it now,
5147 // when everything is fresh in memory.)
5148 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5149
5150 if (klass_id != vmSymbolID::NO_SID) {
5151 for (int j = 0; j < methods->length(); ++j) {
5152 Method* method = methods->at(j);
5153 method->init_intrinsic_id(klass_id);
5154
5155 if (CheckIntrinsics) {
5156 // Check if an intrinsic is defined for method 'method',
5157 // but the method is not annotated with @IntrinsicCandidate.
5158 if (method->intrinsic_id() != vmIntrinsics::_none &&
5159 !method->intrinsic_candidate()) {
5160 tty->print("Compiler intrinsic is defined for method [%s], "
5161 "but the method is not annotated with @IntrinsicCandidate.%s",
5162 method->name_and_sig_as_C_string(),
5163 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5164 );
5165 tty->cr();
5166 DEBUG_ONLY(vm_exit(1));
5167 }
5168 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5169 // but there is no intrinsic available for it.
5170 if (method->intrinsic_candidate() &&
5171 method->intrinsic_id() == vmIntrinsics::_none) {
5172 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5173 "but no compiler intrinsic is defined for the method.%s",
5174 method->name_and_sig_as_C_string(),
5175 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5176 );
5177 tty->cr();
5178 DEBUG_ONLY(vm_exit(1));
5179 }
5180 }
5181 } // end for
5182
5183 #ifdef ASSERT
5184 if (CheckIntrinsics) {
5185 // Check for orphan methods in the current class. A method m
5186 // of a class C is orphan if an intrinsic is defined for method m,
5187 // but class C does not declare m.
5188 // The check is potentially expensive, therefore it is available
5189 // only in debug builds.
5190
5191 for (auto id : EnumRange<vmIntrinsicID>{}) {
5192 if (vmIntrinsics::_compiledLambdaForm == id) {
5193 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5194 // generated for the JVM from a LambdaForm and therefore no method
5195 // is defined for it.
5196 continue;
5197 }
5198 if (vmIntrinsics::_blackhole == id) {
5199 // The _blackhole intrinsic is a special marker. No explicit method
5200 // is defined for it.
5201 continue;
5202 }
5203
5204 if (vmIntrinsics::class_for(id) == klass_id) {
5205 // Check if the current class contains a method with the same
5206 // name, flags, signature.
5207 bool match = false;
5208 for (int j = 0; j < methods->length(); ++j) {
5209 const Method* method = methods->at(j);
5210 if (method->intrinsic_id() == id) {
5211 match = true;
5212 break;
5213 }
5214 }
5215
5216 if (!match) {
5217 char buf[1000];
5218 tty->print("Compiler intrinsic is defined for method [%s], "
5219 "but the method is not available in class [%s].%s",
5220 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5221 ik->name()->as_C_string(),
5222 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5223 );
5224 tty->cr();
5225 DEBUG_ONLY(vm_exit(1));
5226 }
5227 }
5228 } // end for
5229 } // CheckIntrinsics
5230 #endif // ASSERT
5231 }
5232 }
5233
5234 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5235 const ClassInstanceInfo& cl_inst_info,
5236 TRAPS) {
5237 if (_klass != nullptr) {
5238 return _klass;
5239 }
5240
5241 InstanceKlass* const ik =
5242 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5243
5244 if (is_hidden()) {
5245 mangle_hidden_class_name(ik);
5246 }
5247
5248 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5249
5250 assert(_klass == ik, "invariant");
5251 return ik;
5252 }
5253
5254 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5255 bool changed_by_loadhook,
5256 const ClassInstanceInfo& cl_inst_info,
5257 TRAPS) {
5258 assert(ik != nullptr, "invariant");
5259
5260 // Set name and CLD before adding to CLD
5261 ik->set_class_loader_data(_loader_data);
5262 ik->set_name(_class_name);
5263
5264 // Add all classes to our internal class loader list here,
5265 // including classes in the bootstrap (null) class loader.
5266 const bool publicize = !is_internal();
5267
5268 _loader_data->add_class(ik, publicize);
5269
5270 set_klass_to_deallocate(ik);
5271
5272 assert(_layout_info != nullptr, "invariant");
5273 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5274 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5275 "sanity");
5276
5277 assert(ik->is_instance_klass(), "sanity");
5278 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5279
5280 // Fill in information already parsed
5281 ik->set_should_verify_class(_need_verify);
5282
5283 // Not yet: supers are done below to support the new subtype-checking fields
5284 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5285 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5286
5287 if (_layout_info->_is_naturally_atomic) {
5288 ik->set_is_naturally_atomic();
5289 }
5290
5291 if (_layout_info->_must_be_atomic) {
5292 ik->set_must_be_atomic();
5293 }
5294 if (_is_implicitly_constructible) {
5295 ik->set_is_implicitly_constructible();
5296 }
5297
5298 ik->set_static_oop_field_count(_static_oop_count);
5299
5300 // this transfers ownership of a lot of arrays from
5301 // the parser onto the InstanceKlass*
5302 apply_parsed_class_metadata(ik, _java_fields_count);
5303 if (ik->is_inline_klass()) {
5304 InlineKlass::cast(ik)->init_fixed_block();
5305 }
5306
5307 // can only set dynamic nest-host after static nest information is set
5308 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5309 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5310 }
5311
5312 // note that is not safe to use the fields in the parser from this point on
5313 assert(nullptr == _cp, "invariant");
5314 assert(nullptr == _fieldinfo_stream, "invariant");
5315 assert(nullptr == _fields_status, "invariant");
5316 assert(nullptr == _methods, "invariant");
5317 assert(nullptr == _inner_classes, "invariant");
5318 assert(nullptr == _nest_members, "invariant");
5319 assert(nullptr == _loadable_descriptors, "invariant");
5320 assert(nullptr == _combined_annotations, "invariant");
5321 assert(nullptr == _record_components, "invariant");
5322 assert(nullptr == _permitted_subclasses, "invariant");
5323 assert(nullptr == _inline_layout_info_array, "invariant");
5324
5325 if (_has_localvariable_table) {
5326 ik->set_has_localvariable_table(true);
5327 }
5328
5329 if (_has_final_method) {
5330 ik->set_has_final_method();
5331 }
5332
5333 ik->copy_method_ordering(_method_ordering, CHECK);
5334 // The InstanceKlass::_methods_jmethod_ids cache
5335 // is managed on the assumption that the initial cache
5336 // size is equal to the number of methods in the class. If
5337 // that changes, then InstanceKlass::idnum_can_increment()
5338 // has to be changed accordingly.
5339 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5340
5341 ik->set_this_class_index(_this_class_index);
5342
5343 if (_is_hidden) {
5344 // _this_class_index is a CONSTANT_Class entry that refers to this
5345 // hidden class itself. If this class needs to refer to its own methods
5346 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5347 // _this_class_index. However, because this class is hidden (it's
5348 // not stored in SystemDictionary), _this_class_index cannot be resolved
5349 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5350 // Therefore, we must eagerly resolve _this_class_index now.
5351 ik->constants()->klass_at_put(_this_class_index, ik);
5352 }
5353
5354 ik->set_minor_version(_minor_version);
5355 ik->set_major_version(_major_version);
5356 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5357 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5358
5359 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5360
5361 // Set PackageEntry for this_klass
5362 oop cl = ik->class_loader();
5363 Handle clh = Handle(THREAD, cl);
5364 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5365 ik->set_package(cld, nullptr, CHECK);
5366
5367 const Array<Method*>* const methods = ik->methods();
5368 assert(methods != nullptr, "invariant");
5369 const int methods_len = methods->length();
5370
5371 check_methods_for_intrinsics(ik, methods);
5372
5373 // Fill in field values obtained by parse_classfile_attributes
5374 if (_parsed_annotations->has_any_annotations()) {
5375 _parsed_annotations->apply_to(ik);
5376 }
5377
5378 apply_parsed_class_attributes(ik);
5379
5380 // Miranda methods
5381 if ((_num_miranda_methods > 0) ||
5382 // if this class introduced new miranda methods or
5383 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5384 // super class exists and this class inherited miranda methods
5385 ) {
5386 ik->set_has_miranda_methods(); // then set a flag
5387 }
5388
5389 // Fill in information needed to compute superclasses.
5390 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5391 ik->set_transitive_interfaces(_transitive_interfaces);
5392 ik->set_local_interfaces(_local_interfaces);
5393 _transitive_interfaces = nullptr;
5394 _local_interfaces = nullptr;
5395
5396 // Initialize itable offset tables
5397 klassItable::setup_itable_offset_table(ik);
5398
5399 // Compute transitive closure of interfaces this class implements
5400 // Do final class setup
5401 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5402 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5403 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5404 }
5405
5406 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5407 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5408 ik->set_has_contended_annotations(true);
5409 }
5410
5411 // Fill in has_finalizer and layout_helper
5412 set_precomputed_flags(ik);
5413
5414 // check if this class can access its super class
5415 check_super_class_access(ik, CHECK);
5416
5417 // check if this class can access its superinterfaces
5418 check_super_interface_access(ik, CHECK);
5419
5420 // check if this class overrides any final method
5421 check_final_method_override(ik, CHECK);
5422
5423 // reject static interface methods prior to Java 8
5424 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5425 check_illegal_static_method(ik, CHECK);
5426 }
5427
5428 // Obtain this_klass' module entry
5429 ModuleEntry* module_entry = ik->module();
5430 assert(module_entry != nullptr, "module_entry should always be set");
5431
5432 // Obtain java.lang.Module
5433 Handle module_handle(THREAD, module_entry->module());
5434
5435 // Allocate mirror and initialize static fields
5436 // The create_mirror() call will also call compute_modifiers()
5437 java_lang_Class::create_mirror(ik,
5438 Handle(THREAD, _loader_data->class_loader()),
5439 module_handle,
5440 _protection_domain,
5441 cl_inst_info.class_data(),
5442 CHECK);
5443
5444 assert(_all_mirandas != nullptr, "invariant");
5445
5446 // Generate any default methods - default methods are public interface methods
5447 // that have a default implementation. This is new with Java 8.
5448 if (_has_nonstatic_concrete_methods) {
5449 DefaultMethods::generate_default_methods(ik,
5450 _all_mirandas,
5451 CHECK);
5452 }
5453
5454 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5455 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5456 !module_entry->has_default_read_edges()) {
5457 if (!module_entry->set_has_default_read_edges()) {
5458 // We won a potential race
5459 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5460 }
5461 }
5462
5463 if (is_inline_type()) {
5464 InlineKlass* vk = InlineKlass::cast(ik);
5465 vk->set_payload_alignment(_layout_info->_payload_alignment);
5466 vk->set_first_field_offset(_layout_info->_first_field_offset);
5467 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5468 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5469 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5470 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5471 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5472 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5473 vk->set_default_value_offset(_layout_info->_default_value_offset);
5474 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5475 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5476 vk->initialize_calling_convention(CHECK);
5477 }
5478
5479 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5480
5481 if (!is_internal()) {
5482 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5483
5484 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5485 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5486 log_is_enabled(Info, class, preview)) {
5487 ResourceMark rm;
5488 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5489 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5490 }
5491
5492 if (log_is_enabled(Debug, class, resolve)) {
5493 ResourceMark rm;
5494 // print out the superclass.
5495 const char * from = ik->external_name();
5496 if (ik->java_super() != nullptr) {
5497 log_debug(class, resolve)("%s %s (super)",
5498 from,
5499 ik->java_super()->external_name());
5500 }
5501 // print out each of the interface classes referred to by this class.
5502 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5503 if (local_interfaces != nullptr) {
5504 const int length = local_interfaces->length();
5505 for (int i = 0; i < length; i++) {
5506 const InstanceKlass* const k = local_interfaces->at(i);
5507 const char * to = k->external_name();
5508 log_debug(class, resolve)("%s %s (interface)", from, to);
5509 }
5510 }
5511 }
5512 }
5513
5514 JFR_ONLY(INIT_ID(ik);)
5515
5516 // If we reach here, all is well.
5517 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5518 // in order for it to not be destroyed in the ClassFileParser destructor.
5519 set_klass_to_deallocate(nullptr);
5520
5521 // it's official
5522 set_klass(ik);
5523
5524 debug_only(ik->verify();)
5525 }
5526
5527 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5528 // Decrement the refcount in the old name, since we're clobbering it.
5529 _class_name->decrement_refcount();
5530
5531 _class_name = new_class_name;
5532 // Increment the refcount of the new name.
5533 // Now the ClassFileParser owns this name and will decrement in
5534 // the destructor.
5535 _class_name->increment_refcount();
5536 }
5537
5538 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5539 bool trusted = loader_data->is_boot_class_loader_data() ||
5540 loader_data->is_platform_class_loader_data();
5541 bool need_verify =
5542 // verifyAll
5543 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5544 // verifyRemote
5545 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5546 return !need_verify;
5547 }
5548
5549 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5550 Symbol* name,
5551 ClassLoaderData* loader_data,
5552 const ClassLoadInfo* cl_info,
5553 Publicity pub_level,
5554 TRAPS) :
5555 _stream(stream),
5556 _class_name(nullptr),
5557 _loader_data(loader_data),
5558 _is_hidden(cl_info->is_hidden()),
5559 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5560 _orig_cp_size(0),
5561 _static_oop_count(0),
5562 _super_klass(),
5563 _cp(nullptr),
5564 _fieldinfo_stream(nullptr),
5565 _fields_status(nullptr),
5566 _methods(nullptr),
5567 _inner_classes(nullptr),
5568 _nest_members(nullptr),
5569 _nest_host(0),
5570 _permitted_subclasses(nullptr),
5571 _loadable_descriptors(nullptr),
5572 _record_components(nullptr),
5573 _local_interfaces(nullptr),
5574 _local_interface_indexes(nullptr),
5575 _transitive_interfaces(nullptr),
5576 _combined_annotations(nullptr),
5577 _class_annotations(nullptr),
5578 _class_type_annotations(nullptr),
5579 _fields_annotations(nullptr),
5580 _fields_type_annotations(nullptr),
5581 _klass(nullptr),
5582 _klass_to_deallocate(nullptr),
5583 _parsed_annotations(nullptr),
5584 _layout_info(nullptr),
5585 _inline_layout_info_array(nullptr),
5586 _temp_field_info(nullptr),
5587 _method_ordering(nullptr),
5588 _all_mirandas(nullptr),
5589 _vtable_size(0),
5590 _itable_size(0),
5591 _num_miranda_methods(0),
5592 _protection_domain(cl_info->protection_domain()),
5593 _access_flags(),
5594 _pub_level(pub_level),
5595 _bad_constant_seen(0),
5596 _synthetic_flag(false),
5597 _sde_length(false),
5598 _sde_buffer(nullptr),
5599 _sourcefile_index(0),
5600 _generic_signature_index(0),
5601 _major_version(0),
5602 _minor_version(0),
5603 _this_class_index(0),
5604 _super_class_index(0),
5605 _itfs_len(0),
5606 _java_fields_count(0),
5607 _need_verify(false),
5608 _relax_verify(false),
5609 _has_nonstatic_concrete_methods(false),
5610 _declares_nonstatic_concrete_methods(false),
5611 _has_localvariable_table(false),
5612 _has_final_method(false),
5613 _has_contended_fields(false),
5614 _has_inline_type_fields(false),
5615 _is_naturally_atomic(false),
5616 _must_be_atomic(true),
5617 _is_implicitly_constructible(false),
5618 _has_loosely_consistent_annotation(false),
5619 _has_implicitly_constructible_annotation(false),
5620 _has_finalizer(false),
5621 _has_empty_finalizer(false),
5622 _max_bootstrap_specifier_index(-1) {
5623
5624 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5625 _class_name->increment_refcount();
5626
5627 assert(_loader_data != nullptr, "invariant");
5628 assert(stream != nullptr, "invariant");
5629 assert(_stream != nullptr, "invariant");
5630 assert(_stream->buffer() == _stream->current(), "invariant");
5631 assert(_class_name != nullptr, "invariant");
5632 assert(0 == _access_flags.as_int(), "invariant");
5633
5634 // Figure out whether we can skip format checking (matching classic VM behavior)
5635 if (CDSConfig::is_dumping_static_archive()) {
5636 // verify == true means it's a 'remote' class (i.e., non-boot class)
5637 // Verification decision is based on BytecodeVerificationRemote flag
5638 // for those classes.
5639 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5640 BytecodeVerificationLocal;
5641 }
5642 else {
5643 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5644 stream->need_verify());
5645 }
5646
5647 // synch back verification state to stream
5648 stream->set_verify(_need_verify);
5649
5650 // Check if verification needs to be relaxed for this class file
5651 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5652 _relax_verify = relax_format_check_for(_loader_data);
5653
5654 parse_stream(stream, CHECK);
5655
5656 post_process_parsed_stream(stream, _cp, CHECK);
5657 }
5658
5659 void ClassFileParser::clear_class_metadata() {
5660 // metadata created before the instance klass is created. Must be
5661 // deallocated if classfile parsing returns an error.
5662 _cp = nullptr;
5663 _fieldinfo_stream = nullptr;
5664 _fields_status = nullptr;
5665 _methods = nullptr;
5666 _inner_classes = nullptr;
5667 _nest_members = nullptr;
5668 _permitted_subclasses = nullptr;
5669 _loadable_descriptors = nullptr;
5670 _combined_annotations = nullptr;
5671 _class_annotations = _class_type_annotations = nullptr;
5672 _fields_annotations = _fields_type_annotations = nullptr;
5673 _record_components = nullptr;
5674 _inline_layout_info_array = nullptr;
5675 }
5676
5677 // Destructor to clean up
5678 ClassFileParser::~ClassFileParser() {
5679 _class_name->decrement_refcount();
5680
5681 if (_cp != nullptr) {
5682 MetadataFactory::free_metadata(_loader_data, _cp);
5683 }
5684
5685 if (_fieldinfo_stream != nullptr) {
5686 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5687 }
5688
5689 if (_fields_status != nullptr) {
5690 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5691 }
5692
5693 if (_inline_layout_info_array != nullptr) {
5694 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5695 }
5696
5697 if (_methods != nullptr) {
5698 // Free methods
5699 InstanceKlass::deallocate_methods(_loader_data, _methods);
5700 }
5701
5702 // beware of the Universe::empty_blah_array!!
5703 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5704 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5705 }
5706
5707 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5708 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5709 }
5710
5711 if (_record_components != nullptr) {
5712 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5713 }
5714
5715 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5716 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5717 }
5718
5719 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5720 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5721 }
5722
5723 // Free interfaces
5724 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5725 _local_interfaces, _transitive_interfaces);
5726
5727 if (_combined_annotations != nullptr) {
5728 // After all annotations arrays have been created, they are installed into the
5729 // Annotations object that will be assigned to the InstanceKlass being created.
5730
5731 // Deallocate the Annotations object and the installed annotations arrays.
5732 _combined_annotations->deallocate_contents(_loader_data);
5733
5734 // If the _combined_annotations pointer is non-null,
5735 // then the other annotations fields should have been cleared.
5736 assert(_class_annotations == nullptr, "Should have been cleared");
5737 assert(_class_type_annotations == nullptr, "Should have been cleared");
5738 assert(_fields_annotations == nullptr, "Should have been cleared");
5739 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5740 } else {
5741 // If the annotations arrays were not installed into the Annotations object,
5742 // then they have to be deallocated explicitly.
5743 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5744 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5745 Annotations::free_contents(_loader_data, _fields_annotations);
5746 Annotations::free_contents(_loader_data, _fields_type_annotations);
5747 }
5748
5749 clear_class_metadata();
5750 _transitive_interfaces = nullptr;
5751 _local_interfaces = nullptr;
5752
5753 // deallocate the klass if already created. Don't directly deallocate, but add
5754 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5755 // at a safepoint.
5756 if (_klass_to_deallocate != nullptr) {
5757 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5758 }
5759 }
5760
5761 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5762 TRAPS) {
5763
5764 assert(stream != nullptr, "invariant");
5765 assert(_class_name != nullptr, "invariant");
5766
5767 // BEGIN STREAM PARSING
5768 stream->guarantee_more(8, CHECK); // magic, major, minor
5769 // Magic value
5770 const u4 magic = stream->get_u4_fast();
5771 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5772 "Incompatible magic value %u in class file %s",
5773 magic, CHECK);
5774
5775 // Version numbers
5776 _minor_version = stream->get_u2_fast();
5777 _major_version = stream->get_u2_fast();
5778
5779 // Check version numbers - we check this even with verifier off
5780 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5781
5782 stream->guarantee_more(3, CHECK); // length, first cp tag
5783 u2 cp_size = stream->get_u2_fast();
5784
5785 guarantee_property(
5786 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5787 cp_size, CHECK);
5788
5789 _orig_cp_size = cp_size;
5790 if (is_hidden()) { // Add a slot for hidden class name.
5791 cp_size++;
5792 }
5793
5794 _cp = ConstantPool::allocate(_loader_data,
5795 cp_size,
5796 CHECK);
5797
5798 ConstantPool* const cp = _cp;
5799
5800 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5801
5802 assert(cp_size == (u2)cp->length(), "invariant");
5803
5804 // ACCESS FLAGS
5805 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5806
5807 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
5808 // JVM_ACC_MODULE is defined in JDK-9 and later.
5809 if (_major_version >= JAVA_9_VERSION) {
5810 recognized_modifiers |= JVM_ACC_MODULE;
5811 }
5812
5813 // Access flags
5814 jint flags = stream->get_u2_fast() & recognized_modifiers;
5815
5816 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5817 // Set abstract bit for old class files for backward compatibility
5818 flags |= JVM_ACC_ABSTRACT;
5819 }
5820
5821 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5822 if (!supports_inline_types()) {
5823 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5824 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5825 if (!is_module && !is_interface) {
5826 flags |= JVM_ACC_IDENTITY;
5827 }
5828 }
5829
5830
5831 // This class and superclass
5832 _this_class_index = stream->get_u2_fast();
5833 guarantee_property(
5834 valid_cp_range(_this_class_index, cp_size) &&
5835 cp->tag_at(_this_class_index).is_unresolved_klass(),
5836 "Invalid this class index %u in constant pool in class file %s",
5837 _this_class_index, CHECK);
5838
5839 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5840 assert(class_name_in_cp != nullptr, "class_name can't be null");
5841
5842 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
5843
5844 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
5845
5846 _access_flags.set_flags(flags);
5847
5848 short bad_constant = class_bad_constant_seen();
5849 if (bad_constant != 0) {
5850 // Do not throw CFE until after the access_flags are checked because if
5851 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5852 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5853 return;
5854 }
5855
5856 // Don't need to check whether this class name is legal or not.
5857 // It has been checked when constant pool is parsed.
5858 // However, make sure it is not an array type.
5859 if (_need_verify) {
5860 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5861 "Bad class name in class file %s",
5862 CHECK);
5863 }
5864
5865 #ifdef ASSERT
5866 // Basic sanity checks
5867 if (_is_hidden) {
5868 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5869 }
5870 #endif
5871
5872 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5873
5874 if (_is_hidden) {
5875 assert(_class_name != nullptr, "Unexpected null _class_name");
5876 #ifdef ASSERT
5877 if (_need_verify) {
5878 verify_legal_class_name(_class_name, CHECK);
5879 }
5880 #endif
5881
5882 } else {
5883 // Check if name in class file matches given name
5884 if (_class_name != class_name_in_cp) {
5885 if (_class_name != vmSymbols::unknown_class_name()) {
5886 ResourceMark rm(THREAD);
5887 Exceptions::fthrow(THREAD_AND_LOCATION,
5888 vmSymbols::java_lang_NoClassDefFoundError(),
5889 "%s (wrong name: %s)",
5890 _class_name->as_C_string(),
5891 class_name_in_cp->as_C_string()
5892 );
5893 return;
5894 } else {
5895 // The class name was not known by the caller so we set it from
5896 // the value in the CP.
5897 update_class_name(class_name_in_cp);
5898 }
5899 // else nothing to do: the expected class name matches what is in the CP
5900 }
5901 }
5902
5903 // Verification prevents us from creating names with dots in them, this
5904 // asserts that that's the case.
5905 assert(is_internal_format(_class_name), "external class name format used internally");
5906
5907 if (!is_internal()) {
5908 LogTarget(Debug, class, preorder) lt;
5909 if (lt.is_enabled()){
5910 ResourceMark rm(THREAD);
5911 LogStream ls(lt);
5912 ls.print("%s", _class_name->as_klass_external_name());
5913 if (stream->source() != nullptr) {
5914 ls.print(" source: %s", stream->source());
5915 }
5916 ls.cr();
5917 }
5918 }
5919
5920 // SUPERKLASS
5921 _super_class_index = stream->get_u2_fast();
5922 _super_klass = parse_super_class(cp,
5923 _super_class_index,
5924 _need_verify,
5925 CHECK);
5926
5927 // Interfaces
5928 _itfs_len = stream->get_u2_fast();
5929 parse_interfaces(stream,
5930 _itfs_len,
5931 cp,
5932 &_has_nonstatic_concrete_methods,
5933 CHECK);
5934
5935 // Fields (offsets are filled in later)
5936 parse_fields(stream,
5937 _access_flags,
5938 cp,
5939 cp_size,
5940 &_java_fields_count,
5941 CHECK);
5942
5943 assert(_temp_field_info != nullptr, "invariant");
5944
5945 // Methods
5946 parse_methods(stream,
5947 is_interface(),
5948 !is_identity_class(),
5949 is_abstract_class(),
5950 &_has_localvariable_table,
5951 &_has_final_method,
5952 &_declares_nonstatic_concrete_methods,
5953 CHECK);
5954
5955 assert(_methods != nullptr, "invariant");
5956
5957 if (_declares_nonstatic_concrete_methods) {
5958 _has_nonstatic_concrete_methods = true;
5959 }
5960
5961 // Additional attributes/annotations
5962 _parsed_annotations = new ClassAnnotationCollector();
5963 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5964
5965 assert(_inner_classes != nullptr, "invariant");
5966
5967 // Finalize the Annotations metadata object,
5968 // now that all annotation arrays have been created.
5969 create_combined_annotations(CHECK);
5970
5971 // Make sure this is the end of class file stream
5972 guarantee_property(stream->at_eos(),
5973 "Extra bytes at the end of class file %s",
5974 CHECK);
5975
5976 // all bytes in stream read and parsed
5977 }
5978
5979 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5980 ResourceMark rm;
5981 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5982 // use a '/' because that confuses finding the class's package. Also, can't
5983 // use an illegal char such as ';' because that causes serialization issues
5984 // and issues with hidden classes that create their own hidden classes.
5985 char addr_buf[20];
5986 if (CDSConfig::is_dumping_static_archive()) {
5987 // We want stable names for the archived hidden classes (only for static
5988 // archive for now). Spaces under default_SharedBaseAddress() will be
5989 // occupied by the archive at run time, so we know that no dynamically
5990 // loaded InstanceKlass will be placed under there.
5991 static volatile size_t counter = 0;
5992 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5993 size_t new_id = Atomic::add(&counter, (size_t)1);
5994 jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
5995 } else {
5996 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5997 }
5998 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5999 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6000 jio_snprintf(new_name, new_name_len, "%s+%s",
6001 _class_name->as_C_string(), addr_buf);
6002 update_class_name(SymbolTable::new_symbol(new_name));
6003
6004 // Add a Utf8 entry containing the hidden name.
6005 assert(_class_name != nullptr, "Unexpected null _class_name");
6006 int hidden_index = _orig_cp_size; // this is an extra slot we added
6007 _cp->symbol_at_put(hidden_index, _class_name);
6008
6009 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6010 // We have to update the resolved_klass_index and the name_index together
6011 // so extract the existing resolved_klass_index first.
6012 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6013 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6014 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6015 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6016 "Bad name_index");
6017 }
6018
6019 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6020 ConstantPool* cp,
6021 TRAPS) {
6022 assert(stream != nullptr, "invariant");
6023 assert(stream->at_eos(), "invariant");
6024 assert(cp != nullptr, "invariant");
6025 assert(_loader_data != nullptr, "invariant");
6026
6027 if (_class_name == vmSymbols::java_lang_Object()) {
6028 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6029 "java.lang.Object cannot implement an interface in class file %s",
6030 CHECK);
6031 }
6032 // We check super class after class file is parsed and format is checked
6033 if (_super_class_index > 0 && nullptr == _super_klass) {
6034 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6035 if (is_interface()) {
6036 // Before attempting to resolve the superclass, check for class format
6037 // errors not checked yet.
6038 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6039 "Interfaces must have java.lang.Object as superclass in class file %s",
6040 CHECK);
6041 }
6042 Handle loader(THREAD, _loader_data->class_loader());
6043 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6044 _super_klass = vmClasses::Object_klass();
6045 } else {
6046 _super_klass = (const InstanceKlass*)
6047 SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6048 super_class_name,
6049 loader,
6050 _protection_domain,
6051 true,
6052 CHECK);
6053 }
6054 }
6055
6056 if (_super_klass != nullptr) {
6057 if (_super_klass->is_interface()) {
6058 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6059 return;
6060 }
6061
6062 if (_super_klass->is_final()) {
6063 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6064 return;
6065 }
6066
6067 if (EnableValhalla) {
6068 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6069 }
6070
6071 if (_super_klass->has_nonstatic_concrete_methods()) {
6072 _has_nonstatic_concrete_methods = true;
6073 }
6074 }
6075
6076 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6077 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6078 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6079 _class_name->as_klass_external_name()));
6080 }
6081 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_ImplicitlyConstructible) && _access_flags.is_identity_class()) {
6082 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6083 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.ImplicitlyConstructible, because it is not a value class",
6084 _class_name->as_klass_external_name()));
6085 }
6086
6087 // Determining is the class allows tearing or not (default is not)
6088 if (EnableValhalla && !_access_flags.is_identity_class()) {
6089 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6090 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6091 // Conditions above are not sufficient to determine atomicity requirements,
6092 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6093 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6094 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6095 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6096 _must_be_atomic = false;
6097 }
6098 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_ImplicitlyConstructible)
6099 && (_super_klass == vmClasses::Object_klass() || _super_klass == vmClasses::Record_klass()
6100 || _super_klass->is_implicitly_constructible())) {
6101 _is_implicitly_constructible = true;
6102 }
6103 // Apply VM options override
6104 if (*ForceNonTearable != '\0') {
6105 // Allow a command line switch to force the same atomicity property:
6106 const char* class_name_str = _class_name->as_C_string();
6107 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6108 _must_be_atomic = true;
6109 }
6110 }
6111 }
6112
6113 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6114 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6115 if (_local_interface_indexes != nullptr) {
6116 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6117 u2 interface_index = _local_interface_indexes->at(i);
6118 Klass* interf;
6119 if (cp->tag_at(interface_index).is_klass()) {
6120 interf = cp->resolved_klass_at(interface_index);
6121 } else {
6122 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6123
6124 // Don't need to check legal name because it's checked when parsing constant pool.
6125 // But need to make sure it's not an array type.
6126 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6127 "Bad interface name in class file %s", CHECK);
6128
6129 // Call resolve on the interface class name with class circularity checking
6130 interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6131 _class_name,
6132 unresolved_klass,
6133 Handle(THREAD, _loader_data->class_loader()),
6134 _protection_domain,
6135 false,
6136 CHECK);
6137 }
6138
6139 if (!interf->is_interface()) {
6140 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6141 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6142 _class_name->as_klass_external_name(),
6143 interf->external_name(),
6144 interf->class_in_module_of_loader()));
6145 }
6146
6147 if (EnableValhalla) {
6148 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6149 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6150 }
6151
6152 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6153 _has_nonstatic_concrete_methods = true;
6154 }
6155 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6156 }
6157 }
6158 assert(_local_interfaces != nullptr, "invariant");
6159
6160 // Compute the transitive list of all unique interfaces implemented by this class
6161 _transitive_interfaces =
6162 compute_transitive_interfaces(_super_klass,
6163 _local_interfaces,
6164 _loader_data,
6165 CHECK);
6166
6167 assert(_transitive_interfaces != nullptr, "invariant");
6168
6169 // sort methods
6170 _method_ordering = sort_methods(_methods);
6171
6172 _all_mirandas = new GrowableArray<Method*>(20);
6173
6174 Handle loader(THREAD, _loader_data->class_loader());
6175 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6176 &_num_miranda_methods,
6177 _all_mirandas,
6178 _super_klass,
6179 _methods,
6180 _access_flags,
6181 _major_version,
6182 loader,
6183 _class_name,
6184 _local_interfaces);
6185
6186 // Size of Java itable (in words)
6187 _itable_size = is_interface() ? 0 :
6188 klassItable::compute_itable_size(_transitive_interfaces);
6189
6190 assert(_parsed_annotations != nullptr, "invariant");
6191
6192 if (EnableValhalla) {
6193 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6194 java_fields_count(),
6195 CHECK);
6196 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6197 FieldInfo fieldinfo = *it;
6198 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6199 Symbol* sig = fieldinfo.signature(cp);
6200 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6201 // Pre-load classes of null-free fields that are candidate for flattening
6202 TempNewSymbol s = Signature::strip_envelope(sig);
6203 if (s == _class_name) {
6204 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()));
6205 }
6206 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());
6207 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s, Handle(THREAD, _loader_data->class_loader()), _protection_domain, false, THREAD);
6208 if (HAS_PENDING_EXCEPTION) {
6209 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) failed: %s",
6210 s->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6211 return; // Exception is still pending
6212 }
6213 assert(klass != nullptr, "Sanity check");
6214 if (klass->access_flags().is_identity_class()) {
6215 assert(klass->is_instance_klass(), "Sanity check");
6216 ResourceMark rm(THREAD);
6217 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6218 err_msg("Class %s expects class %s to be a value class, but it is an identity class",
6219 _class_name->as_C_string(),
6220 InstanceKlass::cast(klass)->external_name()));
6221 }
6222 if (klass->is_abstract()) {
6223 assert(klass->is_instance_klass(), "Sanity check");
6224 ResourceMark rm(THREAD);
6225 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6226 err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
6227 _class_name->as_C_string(),
6228 InstanceKlass::cast(klass)->external_name()));
6229 }
6230 InlineKlass* vk = InlineKlass::cast(klass);
6231 if (!vk->is_implicitly_constructible()) {
6232 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6233 err_msg("class %s is not implicitly constructible and it is used in a null restricted non-static field (not supported)",
6234 klass->name()->as_C_string()));
6235 }
6236 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6237 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());
6238 } else if (Signature::has_envelope(sig)) {
6239 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6240 // Those classes would be required later for the flattening of nullable inline type fields
6241 TempNewSymbol name = Signature::strip_envelope(sig);
6242 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6243 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());
6244 oop loader = loader_data()->class_loader();
6245 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name, Handle(THREAD, loader), _protection_domain, false, THREAD);
6246 if (klass != nullptr) {
6247 if (klass->is_inline_klass()) {
6248 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6249 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());
6250 } else {
6251 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6252 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());
6253 }
6254 } else {
6255 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) failed : %s",
6256 name->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6257 }
6258 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6259 if (HAS_PENDING_EXCEPTION) {
6260 CLEAR_PENDING_EXCEPTION;
6261 }
6262 }
6263 }
6264 }
6265 }
6266
6267 _layout_info = new FieldLayoutInfo();
6268 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6269 _parsed_annotations->is_contended(), is_inline_type(),
6270 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6271 _must_be_atomic, _layout_info, _inline_layout_info_array);
6272 lb.build_layout();
6273 _has_inline_type_fields = _layout_info->_has_inline_fields;
6274
6275 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6276 _fieldinfo_stream =
6277 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6278 injected_fields_count, loader_data(), CHECK);
6279
6280 _fields_status =
6281 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6282 FieldStatus(0), CHECK);
6283 }
6284
6285 void ClassFileParser::set_klass(InstanceKlass* klass) {
6286
6287 #ifdef ASSERT
6288 if (klass != nullptr) {
6289 assert(nullptr == _klass, "leaking?");
6290 }
6291 #endif
6292
6293 _klass = klass;
6294 }
6295
6296 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6297
6298 #ifdef ASSERT
6299 if (klass != nullptr) {
6300 assert(nullptr == _klass_to_deallocate, "leaking?");
6301 }
6302 #endif
6303
6304 _klass_to_deallocate = klass;
6305 }
6306
6307 // Caller responsible for ResourceMark
6308 // clone stream with rewound position
6309 const ClassFileStream* ClassFileParser::clone_stream() const {
6310 assert(_stream != nullptr, "invariant");
6311
6312 return _stream->clone();
6313 }
6314
6315 ReferenceType ClassFileParser::super_reference_type() const {
6316 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6317 }
6318
6319 bool ClassFileParser::is_instance_ref_klass() const {
6320 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6321 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6322 // klass requiring special treatment in ref-processing. The abstract
6323 // j.l.r.Reference cannot be instantiated so doesn't partake in
6324 // ref-processing.
6325 return is_java_lang_ref_Reference_subclass();
6326 }
6327
6328 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6329 if (_super_klass == nullptr) {
6330 return false;
6331 }
6332
6333 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6334 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6335 return true;
6336 }
6337
6338 return _super_klass->reference_type() != REF_NONE;
6339 }
6340
6341 // ----------------------------------------------------------------------------
6342 // debugging
6343
6344 #ifdef ASSERT
6345
6346 // return true if class_name contains no '.' (internal format is '/')
6347 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6348 if (class_name != nullptr) {
6349 ResourceMark rm;
6350 char* name = class_name->as_C_string();
6351 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6352 } else {
6353 return true;
6354 }
6355 }
6356
6357 #endif