1 /*
2 * Copyright (c) 1997, 2026, 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 "cds/cdsConfig.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/classLoadInfo.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/fieldLayoutBuilder.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/systemDictionaryShared.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.hpp"
52 #include "oops/bsmAttribute.inline.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/exceptions.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/globalDefinitions.hpp"
87 #include "utilities/growableArray.hpp"
88 #include "utilities/hashTable.hpp"
89 #include "utilities/macros.hpp"
90 #include "utilities/ostream.hpp"
91 #include "utilities/stringUtils.hpp"
92 #include "utilities/utf8.hpp"
93
94 // We generally try to create the oops directly when parsing, rather than
95 // allocating temporary data structures and copying the bytes twice. A
96 // temporary area is only needed when parsing utf8 entries in the constant
97 // pool and when parsing line number tables.
98
99 // We add assert in debug mode when class format is not checked.
100
101 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
102 #define JAVA_MIN_SUPPORTED_VERSION 45
103 #define JAVA_PREVIEW_MINOR_VERSION 65535
104
105 // Used for two backward compatibility reasons:
106 // - to check for new additions to the class file format in JDK1.5
107 // - to check for bug fixes in the format checker in JDK1.5
108 #define JAVA_1_5_VERSION 49
109
110 // Used for backward compatibility reasons:
111 // - to check for javac bug fixes that happened after 1.5
112 // - also used as the max version when running in jdk6
113 #define JAVA_6_VERSION 50
114
115 // Used for backward compatibility reasons:
116 // - to disallow argument and require ACC_STATIC for <clinit> methods
117 #define JAVA_7_VERSION 51
118
119 // Extension method support.
120 #define JAVA_8_VERSION 52
121
122 #define JAVA_9_VERSION 53
123
124 #define JAVA_10_VERSION 54
125
126 #define JAVA_11_VERSION 55
127
128 #define JAVA_12_VERSION 56
129
130 #define JAVA_13_VERSION 57
131
132 #define JAVA_14_VERSION 58
133
134 #define JAVA_15_VERSION 59
135
136 #define JAVA_16_VERSION 60
137
138 #define JAVA_17_VERSION 61
139
140 #define JAVA_18_VERSION 62
141
142 #define JAVA_19_VERSION 63
143
144 #define JAVA_20_VERSION 64
145
146 #define JAVA_21_VERSION 65
147
148 #define JAVA_22_VERSION 66
149
150 #define JAVA_23_VERSION 67
151
152 #define JAVA_24_VERSION 68
153
154 #define JAVA_25_VERSION 69
155
156 #define JAVA_26_VERSION 70
157
158 #define JAVA_27_VERSION 71
159
160 #define JAVA_28_VERSION 72
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 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
506 break;
507 }
508 case JVM_CONSTANT_StringIndex: {
509 const int string_index = cp->string_index_at(index);
510 guarantee_property(valid_symbol_at(string_index),
511 "Invalid constant pool index %u in class file %s",
512 string_index, CHECK);
513 Symbol* const sym = cp->symbol_at(string_index);
514 cp->unresolved_string_at_put(index, sym);
515 break;
516 }
517 case JVM_CONSTANT_MethodHandle: {
518 const int ref_index = cp->method_handle_index_at(index);
519 guarantee_property(valid_cp_range(ref_index, length),
520 "Invalid constant pool index %u in class file %s",
521 ref_index, CHECK);
522 const constantTag tag = cp->tag_at(ref_index);
523 const int ref_kind = cp->method_handle_ref_kind_at(index);
524
525 switch (ref_kind) {
526 case JVM_REF_getField:
527 case JVM_REF_getStatic:
528 case JVM_REF_putField:
529 case JVM_REF_putStatic: {
530 guarantee_property(
531 tag.is_field(),
532 "Invalid constant pool index %u in class file %s (not a field)",
533 ref_index, CHECK);
534 break;
535 }
536 case JVM_REF_invokeVirtual:
537 case JVM_REF_newInvokeSpecial: {
538 guarantee_property(
539 tag.is_method(),
540 "Invalid constant pool index %u in class file %s (not a method)",
541 ref_index, CHECK);
542 break;
543 }
544 case JVM_REF_invokeStatic:
545 case JVM_REF_invokeSpecial: {
546 guarantee_property(
547 tag.is_method() ||
548 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
549 "Invalid constant pool index %u in class file %s (not a method)",
550 ref_index, CHECK);
551 break;
552 }
553 case JVM_REF_invokeInterface: {
554 guarantee_property(
555 tag.is_interface_method(),
556 "Invalid constant pool index %u in class file %s (not an interface method)",
557 ref_index, CHECK);
558 break;
559 }
560 default: {
561 classfile_parse_error(
562 "Bad method handle kind at constant pool index %u in class file %s",
563 index, THREAD);
564 return;
565 }
566 } // switch(refkind)
567 // Keep the ref_index unchanged. It will be indirected at link-time.
568 break;
569 } // case MethodHandle
570 case JVM_CONSTANT_MethodType: {
571 const int ref_index = cp->method_type_index_at(index);
572 guarantee_property(valid_symbol_at(ref_index),
573 "Invalid constant pool index %u in class file %s",
574 ref_index, CHECK);
575 break;
576 }
577 case JVM_CONSTANT_Dynamic: {
578 const int name_and_type_ref_index =
579 cp->bootstrap_name_and_type_ref_index_at(index);
580
581 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
582 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
583 "Invalid constant pool index %u in class file %s",
584 name_and_type_ref_index, CHECK);
585 // bootstrap specifier index must be checked later,
586 // when BootstrapMethods attr is available
587
588 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
589 cp->set_has_dynamic_constant();
590 break;
591 }
592 case JVM_CONSTANT_InvokeDynamic: {
593 const int name_and_type_ref_index =
594 cp->bootstrap_name_and_type_ref_index_at(index);
595
596 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
597 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
598 "Invalid constant pool index %u in class file %s",
599 name_and_type_ref_index, CHECK);
600 // bootstrap specifier index must be checked later,
601 // when BootstrapMethods attr is available
602 break;
603 }
604 default: {
605 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
606 ShouldNotReachHere();
607 break;
608 }
609 } // switch(tag)
610 } // end of for
611
612 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
613
614 if (!_need_verify) {
615 return;
616 }
617
618 // second verification pass - checks the strings are of the right format.
619 // but not yet to the other entries
620 for (index = 1; index < length; index++) {
621 const jbyte tag = cp->tag_at(index).value();
622 switch (tag) {
623 case JVM_CONSTANT_UnresolvedClass: {
624 const Symbol* const class_name = cp->klass_name_at(index);
625 // check the name
626 verify_legal_class_name(class_name, CHECK);
627 break;
628 }
629 case JVM_CONSTANT_NameAndType: {
630 if (_need_verify) {
631 const int sig_index = cp->signature_ref_index_at(index);
632 const int name_index = cp->name_ref_index_at(index);
633 const Symbol* const name = cp->symbol_at(name_index);
634 const Symbol* const sig = cp->symbol_at(sig_index);
635 guarantee_property(sig->utf8_length() != 0,
636 "Illegal zero length constant pool entry at %d in class %s",
637 sig_index, CHECK);
638 guarantee_property(name->utf8_length() != 0,
639 "Illegal zero length constant pool entry at %d in class %s",
640 name_index, CHECK);
641
642 if (Signature::is_method(sig)) {
643 // Format check method name and signature
644 verify_legal_method_name(name, CHECK);
645 verify_legal_method_signature(name, sig, CHECK);
646 } else {
647 // Format check field name and signature
648 verify_legal_field_name(name, CHECK);
649 verify_legal_field_signature(name, sig, CHECK);
650 }
651 }
652 break;
653 }
654 case JVM_CONSTANT_Dynamic: {
655 const int name_and_type_ref_index =
656 cp->uncached_name_and_type_ref_index_at(index);
657 // already verified to be utf8
658 const int name_ref_index =
659 cp->name_ref_index_at(name_and_type_ref_index);
660 // already verified to be utf8
661 const int signature_ref_index =
662 cp->signature_ref_index_at(name_and_type_ref_index);
663 const Symbol* const name = cp->symbol_at(name_ref_index);
664 const Symbol* const signature = cp->symbol_at(signature_ref_index);
665 if (_need_verify) {
666 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
667 // Need only to be sure signature is the right type.
668 if (Signature::is_method(signature)) {
669 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
670 }
671 }
672 break;
673 }
674 case JVM_CONSTANT_InvokeDynamic:
675 case JVM_CONSTANT_Fieldref:
676 case JVM_CONSTANT_Methodref:
677 case JVM_CONSTANT_InterfaceMethodref: {
678 const int name_and_type_ref_index =
679 cp->uncached_name_and_type_ref_index_at(index);
680 // already verified to be utf8
681 const int name_ref_index =
682 cp->name_ref_index_at(name_and_type_ref_index);
683 // already verified to be utf8
684 const int signature_ref_index =
685 cp->signature_ref_index_at(name_and_type_ref_index);
686 const Symbol* const name = cp->symbol_at(name_ref_index);
687 const Symbol* const signature = cp->symbol_at(signature_ref_index);
688 if (tag == JVM_CONSTANT_Fieldref) {
689 if (_need_verify) {
690 // Field name and signature are verified above, when iterating NameAndType_info.
691 // Need only to be sure signature is non-zero length and the right type.
692 if (Signature::is_method(signature)) {
693 throwIllegalSignature("Field", name, signature, CHECK);
694 }
695 }
696 } else {
697 if (_need_verify) {
698 // Method name and signature are individually verified above, when iterating
699 // NameAndType_info. Need to check here that signature is non-zero length and
700 // the right type.
701 if (!Signature::is_method(signature)) {
702 throwIllegalSignature("Method", name, signature, CHECK);
703 }
704 }
705 // If a class method name begins with '<', it must be "<init>" and have void signature.
706 const unsigned int name_len = name->utf8_length();
707 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
708 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
709 if (name != vmSymbols::object_initializer_name()) {
710 classfile_parse_error(
711 "Bad method name at constant pool index %u in class file %s",
712 name_ref_index, THREAD);
713 return;
714 } else if (!Signature::is_void_method(signature)) { // must have void signature.
715 throwIllegalSignature("Method", name, signature, CHECK);
716 }
717 }
718 }
719 break;
720 }
721 case JVM_CONSTANT_MethodHandle: {
722 const int ref_index = cp->method_handle_index_at(index);
723 const int ref_kind = cp->method_handle_ref_kind_at(index);
724 switch (ref_kind) {
725 case JVM_REF_invokeVirtual:
726 case JVM_REF_invokeStatic:
727 case JVM_REF_invokeSpecial:
728 case JVM_REF_newInvokeSpecial: {
729 const int name_and_type_ref_index =
730 cp->uncached_name_and_type_ref_index_at(ref_index);
731 const int name_ref_index =
732 cp->name_ref_index_at(name_and_type_ref_index);
733 const Symbol* const name = cp->symbol_at(name_ref_index);
734 if (ref_kind == JVM_REF_newInvokeSpecial) {
735 if (name != vmSymbols::object_initializer_name()) {
736 classfile_parse_error(
737 "Bad constructor name at constant pool index %u in class file %s",
738 name_ref_index, THREAD);
739 return;
740 }
741 } else {
742 if (name == vmSymbols::object_initializer_name()) {
743 classfile_parse_error(
744 "Bad method name at constant pool index %u in class file %s",
745 name_ref_index, THREAD);
746 return;
747 }
748 }
749 break;
750 }
751 // Other ref_kinds are already fully checked in previous pass.
752 } // switch(ref_kind)
753 break;
754 }
755 case JVM_CONSTANT_MethodType: {
756 const Symbol* const no_name = vmSymbols::type_name(); // place holder
757 const Symbol* const signature = cp->method_type_signature_at(index);
758 verify_legal_method_signature(no_name, signature, CHECK);
759 break;
760 }
761 case JVM_CONSTANT_Utf8: {
762 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
763 }
764 } // switch(tag)
765 } // end of for
766 }
767
768 class NameSigHash: public ResourceObj {
769 public:
770 const Symbol* _name; // name
771 const Symbol* _sig; // signature
772
773 static const int HASH_ROW_SIZE = 256;
774
775 NameSigHash(Symbol* name, Symbol* sig) :
776 _name(name),
777 _sig(sig) {}
778
779 static unsigned int hash(NameSigHash const& namesig) {
780 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
781 }
782
783 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
784 return (e0._name == e1._name) &&
785 (e0._sig == e1._sig);
786 }
787 };
788
789 using NameSigHashtable = HashTable<NameSigHash, int,
790 NameSigHash::HASH_ROW_SIZE,
791 AnyObj::RESOURCE_AREA, mtInternal,
792 &NameSigHash::hash, &NameSigHash::equals>;
793
794 // Side-effects: populates the _local_interfaces field
795 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
796 const int itfs_len,
797 ConstantPool* const cp,
798 bool* const has_nonstatic_concrete_methods,
799 TRAPS) {
800 assert(stream != nullptr, "invariant");
801 assert(cp != nullptr, "invariant");
802 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
803
804 if (itfs_len == 0) {
805 _local_interfaces = Universe::the_empty_instance_klass_array();
806 } else {
807 assert(itfs_len > 0, "only called for len>0");
808 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
809
810 int index;
811 for (index = 0; index < itfs_len; index++) {
812 const u2 interface_index = stream->get_u2(CHECK);
813 Klass* interf;
814 guarantee_property(
815 valid_klass_reference_at(interface_index),
816 "Interface name has bad constant pool index %u in class file %s",
817 interface_index, CHECK);
818 if (cp->tag_at(interface_index).is_klass()) {
819 interf = cp->resolved_klass_at(interface_index);
820 } else {
821 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
822
823 // Don't need to check legal name because it's checked when parsing constant pool.
824 // But need to make sure it's not an array type.
825 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
826 "Bad interface name in class file %s", CHECK);
827
828 // Call resolve on the interface class name with class circularity checking
829 interf = SystemDictionary::resolve_super_or_fail(_class_name,
830 unresolved_klass,
831 Handle(THREAD, _loader_data->class_loader()),
832 false, CHECK);
833 }
834
835 if (!interf->is_interface()) {
836 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
837 err_msg("class %s can not implement %s, because it is not an interface (%s)",
838 _class_name->as_klass_external_name(),
839 interf->external_name(),
840 interf->class_in_module_of_loader()));
841 }
842
843 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
844 *has_nonstatic_concrete_methods = true;
845 }
846 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
847 }
848
849 if (!_need_verify || itfs_len <= 1) {
850 return;
851 }
852
853 // Check if there's any duplicates in interfaces
854 ResourceMark rm(THREAD);
855 // Set containing interface names
856 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
857 for (index = 0; index < itfs_len; index++) {
858 const InstanceKlass* const k = _local_interfaces->at(index);
859 Symbol* interface_name = k->name();
860 // If no duplicates, add (name, nullptr) in hashtable interface_names.
861 if (!interface_names->put(interface_name, 0)) {
862 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
863 interface_name->as_C_string(), THREAD);
864 return;
865 }
866 }
867 }
868 }
869
870 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
871 int constantvalue_index,
872 int signature_index,
873 TRAPS) const {
874 // Make sure the constant pool entry is of a type appropriate to this field
875 guarantee_property(
876 (constantvalue_index > 0 &&
877 constantvalue_index < cp->length()),
878 "Bad initial value index %u in ConstantValue attribute in class file %s",
879 constantvalue_index, CHECK);
880
881 const constantTag value_type = cp->tag_at(constantvalue_index);
882 switch(cp->basic_type_for_signature_at(signature_index)) {
883 case T_LONG: {
884 guarantee_property(value_type.is_long(),
885 "Inconsistent constant value type in class file %s",
886 CHECK);
887 break;
888 }
889 case T_FLOAT: {
890 guarantee_property(value_type.is_float(),
891 "Inconsistent constant value type in class file %s",
892 CHECK);
893 break;
894 }
895 case T_DOUBLE: {
896 guarantee_property(value_type.is_double(),
897 "Inconsistent constant value type in class file %s",
898 CHECK);
899 break;
900 }
901 case T_BYTE:
902 case T_CHAR:
903 case T_SHORT:
904 case T_BOOLEAN:
905 case T_INT: {
906 guarantee_property(value_type.is_int(),
907 "Inconsistent constant value type in class file %s",
908 CHECK);
909 break;
910 }
911 case T_OBJECT: {
912 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
913 && value_type.is_string()),
914 "Bad string initial value in class file %s",
915 CHECK);
916 break;
917 }
918 default: {
919 classfile_parse_error("Unable to set initial value %u in class file %s",
920 constantvalue_index,
921 THREAD);
922 }
923 }
924 }
925
926 class AnnotationCollector : public ResourceObj{
927 public:
928 enum Location { _in_field, _in_method, _in_class };
929 enum ID {
930 _unknown = 0,
931 _method_CallerSensitive,
932 _method_ForceInline,
933 _method_DontInline,
934 _method_ChangesCurrentThread,
935 _method_JvmtiHideEvents,
936 _method_JvmtiMountTransition,
937 _method_InjectedProfile,
938 _method_LambdaForm_Compiled,
939 _method_Hidden,
940 _method_Scoped,
941 _method_IntrinsicCandidate,
942 _jdk_internal_vm_annotation_Contended,
943 _field_Stable,
944 _jdk_internal_vm_annotation_ReservedStackAccess,
945 _jdk_internal_ValueBased,
946 _jdk_internal_LooselyConsistentValue,
947 _jdk_internal_NullRestricted,
948 _java_lang_Deprecated,
949 _java_lang_Deprecated_for_removal,
950 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
951 _method_AOTRuntimeSetup,
952 _jdk_internal_vm_annotation_TrustFinalFields,
953 _annotation_LIMIT
954 };
955 const Location _location;
956 int _annotations_present;
957 u2 _contended_group;
958
959 AnnotationCollector(Location location)
960 : _location(location), _annotations_present(0), _contended_group(0)
961 {
962 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
963 }
964 // If this annotation name has an ID, report it (or _none).
965 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
966 // Set the annotation name:
967 void set_annotation(ID id) {
968 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
969 _annotations_present |= (int)nth_bit((int)id);
970 }
971
972 void remove_annotation(ID id) {
973 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
974 _annotations_present &= (int)~nth_bit((int)id);
975 }
976
977 // Report if the annotation is present.
978 bool has_any_annotations() const { return _annotations_present != 0; }
979 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
980
981 void set_contended_group(u2 group) { _contended_group = group; }
982 u2 contended_group() const { return _contended_group; }
983
984 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
985
986 void set_stable(bool stable) { set_annotation(_field_Stable); }
987 bool is_stable() const { return has_annotation(_field_Stable); }
988
989 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); }
990 };
991
992 // This class also doubles as a holder for metadata cleanup.
993 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
994 private:
995 ClassLoaderData* _loader_data;
996 AnnotationArray* _field_annotations;
997 AnnotationArray* _field_type_annotations;
998 public:
999 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1000 AnnotationCollector(_in_field),
1001 _loader_data(loader_data),
1002 _field_annotations(nullptr),
1003 _field_type_annotations(nullptr) {}
1004 ~FieldAnnotationCollector();
1005 void apply_to(FieldInfo* f);
1006 AnnotationArray* field_annotations() { return _field_annotations; }
1007 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1008
1009 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1010 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1011 };
1012
1013 class MethodAnnotationCollector : public AnnotationCollector{
1014 public:
1015 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1016 void apply_to(const methodHandle& m);
1017 };
1018
1019 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1020 public:
1021 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1022 void apply_to(InstanceKlass* ik);
1023 };
1024
1025
1026 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth); // fwd decl
1027 static const int max_recursion_depth = 5;
1028
1029 // Safely increment index by val if does not pass limit
1030 #define SAFE_ADD(index, limit, val) \
1031 if (index >= limit - val) return limit; \
1032 index += val;
1033
1034 // Skip an annotation. Return >=limit if there is any problem.
1035 static int skip_annotation(const u1* buffer, int limit, int index, int recursion_depth = 0) {
1036 assert(buffer != nullptr, "invariant");
1037 if (recursion_depth > max_recursion_depth) {
1038 return limit;
1039 }
1040 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1041 // value := switch (tag:u1) { ... }
1042 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1043 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1044 while (--nmem >= 0 && index < limit) {
1045 SAFE_ADD(index, limit, 2); // skip member
1046 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1047 }
1048 return index;
1049 }
1050
1051 // Skip an annotation value. Return >=limit if there is any problem.
1052 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth) {
1053 assert(buffer != nullptr, "invariant");
1054
1055 if (recursion_depth > max_recursion_depth) {
1056 return limit;
1057 }
1058 // value := switch (tag:u1) {
1059 // case B, C, I, S, Z, D, F, J, c: con:u2;
1060 // case e: e_class:u2 e_name:u2;
1061 // case s: s_con:u2;
1062 // case [: do(nval:u2) {value};
1063 // case @: annotation;
1064 // case s: s_con:u2;
1065 // }
1066 SAFE_ADD(index, limit, 1); // read tag
1067 const u1 tag = buffer[index - 1];
1068 switch (tag) {
1069 case 'B':
1070 case 'C':
1071 case 'I':
1072 case 'S':
1073 case 'Z':
1074 case 'D':
1075 case 'F':
1076 case 'J':
1077 case 'c':
1078 case 's':
1079 SAFE_ADD(index, limit, 2); // skip con or s_con
1080 break;
1081 case 'e':
1082 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1083 break;
1084 case '[':
1085 {
1086 SAFE_ADD(index, limit, 2); // read nval
1087 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1088 while (--nval >= 0 && index < limit) {
1089 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1090 }
1091 }
1092 break;
1093 case '@':
1094 index = skip_annotation(buffer, limit, index, recursion_depth + 1);
1095 break;
1096 default:
1097 return limit; // bad tag byte
1098 }
1099 return index;
1100 }
1101
1102 // Sift through annotations, looking for those significant to the VM:
1103 static void parse_annotations(const ConstantPool* const cp,
1104 const u1* buffer, int limit,
1105 AnnotationCollector* coll,
1106 ClassLoaderData* loader_data,
1107 const bool can_access_vm_annotations) {
1108
1109 assert(cp != nullptr, "invariant");
1110 assert(buffer != nullptr, "invariant");
1111 assert(coll != nullptr, "invariant");
1112 assert(loader_data != nullptr, "invariant");
1113
1114 // annotations := do(nann:u2) {annotation}
1115 int index = 2; // read nann
1116 if (index >= limit) return;
1117 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1118 enum { // initial annotation layout
1119 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1120 count_off = 2, // u2 such as 1 (one value)
1121 member_off = 4, // utf8 such as 'value'
1122 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1123 e_tag_val = 'e',
1124 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1125 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1126 e_size = 11, // end of 'e' annotation
1127 c_tag_val = 'c', // payload is type
1128 c_con_off = 7, // utf8 payload, such as 'I'
1129 c_size = 9, // end of 'c' annotation
1130 s_tag_val = 's', // payload is String
1131 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1132 s_size = 9,
1133 b_tag_val = 'Z', // payload is boolean
1134 min_size = 6 // smallest possible size (zero members)
1135 };
1136 // Cannot add min_size to index in case of overflow MAX_INT
1137 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1138 int index0 = index;
1139 index = skip_annotation(buffer, limit, index);
1140 const u1* const abase = buffer + index0;
1141 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1142 const int count = Bytes::get_Java_u2((address)abase + count_off);
1143 const Symbol* const aname = check_symbol_at(cp, atype);
1144 if (aname == nullptr) break; // invalid annotation name
1145 const Symbol* member = nullptr;
1146 if (count >= 1) {
1147 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1148 member = check_symbol_at(cp, member_index);
1149 if (member == nullptr) break; // invalid member name
1150 }
1151
1152 // Here is where parsing particular annotations will take place.
1153 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1154 if (AnnotationCollector::_unknown == id) continue;
1155 coll->set_annotation(id);
1156 if (AnnotationCollector::_java_lang_Deprecated == id) {
1157 // @Deprecated can specify forRemoval=true, which we need
1158 // to record for JFR to use. If the annotation is not well-formed
1159 // then we may not be able to determine that.
1160 const u1* offset = abase + member_off;
1161 // There are only 2 members in @Deprecated.
1162 int n_members = MIN2(count, 2);
1163 for (int i = 0; i < n_members; ++i) {
1164 int member_index = Bytes::get_Java_u2((address)offset);
1165 offset += 2;
1166 member = check_symbol_at(cp, member_index);
1167 if (member == vmSymbols::since() &&
1168 (*((address)offset) == s_tag_val)) {
1169 // Found `since` first so skip over it
1170 offset += 3;
1171 }
1172 else if (member == vmSymbols::for_removal() &&
1173 (*((address)offset) == b_tag_val)) {
1174 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1175 // No guarantee the entry is valid so check it refers to an int in the CP.
1176 if (cp->is_within_bounds(boolean_value_index) &&
1177 cp->tag_at(boolean_value_index).is_int() &&
1178 cp->int_at(boolean_value_index) == 1) {
1179 // forRemoval == true
1180 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1181 }
1182 break; // no need to check further
1183 }
1184 else {
1185 // This @Deprecated annotation is malformed so we don't try to
1186 // determine whether forRemoval is set.
1187 break;
1188 }
1189 }
1190 continue; // proceed to next annotation
1191 }
1192
1193 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1194 // @Contended can optionally specify the contention group.
1195 //
1196 // Contended group defines the equivalence class over the fields:
1197 // the fields within the same contended group are not treated distinct.
1198 // The only exception is default group, which does not incur the
1199 // equivalence. Naturally, contention group for classes is meaningless.
1200 //
1201 // While the contention group is specified as String, annotation
1202 // values are already interned, and we might as well use the constant
1203 // pool index as the group tag.
1204 //
1205 u2 group_index = 0; // default contended group
1206 if (count == 1
1207 && s_size == (index - index0) // match size
1208 && s_tag_val == *(abase + tag_off)
1209 && member == vmSymbols::value_name()) {
1210 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1211 // No guarantee the group_index is valid so check it refers to a
1212 // symbol in the CP.
1213 if (cp->is_within_bounds(group_index) &&
1214 cp->tag_at(group_index).is_utf8()) {
1215 // Seems valid, so check for empty string and reset
1216 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1217 group_index = 0; // default contended group
1218 }
1219 } else {
1220 // Not valid so use the default
1221 group_index = 0;
1222 }
1223 }
1224 coll->set_contended_group(group_index);
1225 continue; // proceed to next annotation
1226 }
1227 }
1228 }
1229
1230
1231 // Parse attributes for a field.
1232 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1233 u2 attributes_count,
1234 bool is_static, u2 signature_index,
1235 u2* const constantvalue_index_addr,
1236 bool* const is_synthetic_addr,
1237 u2* const generic_signature_index_addr,
1238 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1239 TRAPS) {
1240 assert(cfs != nullptr, "invariant");
1241 assert(constantvalue_index_addr != nullptr, "invariant");
1242 assert(is_synthetic_addr != nullptr, "invariant");
1243 assert(generic_signature_index_addr != nullptr, "invariant");
1244 assert(parsed_annotations != nullptr, "invariant");
1245 assert(attributes_count > 0, "attributes_count should be greater than 0");
1246
1247 u2 constantvalue_index = 0;
1248 u2 generic_signature_index = 0;
1249 bool is_synthetic = false;
1250 const u1* runtime_visible_annotations = nullptr;
1251 int runtime_visible_annotations_length = 0;
1252 const u1* runtime_visible_type_annotations = nullptr;
1253 int runtime_visible_type_annotations_length = 0;
1254 bool runtime_invisible_annotations_exists = false;
1255 bool runtime_invisible_type_annotations_exists = false;
1256 const ConstantPool* const cp = _cp;
1257
1258 while (attributes_count--) {
1259 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1260 const u2 attribute_name_index = cfs->get_u2_fast();
1261 const u4 attribute_length = cfs->get_u4_fast();
1262 guarantee_property(valid_symbol_at(attribute_name_index),
1263 "Invalid field attribute index %u in class file %s",
1264 attribute_name_index,
1265 CHECK);
1266
1267 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1268 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1269 // ignore if non-static
1270 if (constantvalue_index != 0) {
1271 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1272 return;
1273 }
1274 guarantee_property(
1275 attribute_length == 2,
1276 "Invalid ConstantValue field attribute length %u in class file %s",
1277 attribute_length, CHECK);
1278
1279 constantvalue_index = cfs->get_u2(CHECK);
1280 if (_need_verify) {
1281 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1282 }
1283 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1284 if (attribute_length != 0) {
1285 classfile_parse_error(
1286 "Invalid Synthetic field attribute length %u in class file %s",
1287 attribute_length, THREAD);
1288 return;
1289 }
1290 is_synthetic = true;
1291 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1292 if (attribute_length != 0) {
1293 classfile_parse_error(
1294 "Invalid Deprecated field attribute length %u in class file %s",
1295 attribute_length, THREAD);
1296 return;
1297 }
1298 } else if (_major_version >= JAVA_1_5_VERSION) {
1299 if (attribute_name == vmSymbols::tag_signature()) {
1300 if (generic_signature_index != 0) {
1301 classfile_parse_error(
1302 "Multiple Signature attributes for field in class file %s", THREAD);
1303 return;
1304 }
1305 if (attribute_length != 2) {
1306 classfile_parse_error(
1307 "Wrong size %u for field's Signature attribute in class file %s",
1308 attribute_length, THREAD);
1309 return;
1310 }
1311 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1312 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1313 if (runtime_visible_annotations != nullptr) {
1314 classfile_parse_error(
1315 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1316 return;
1317 }
1318 runtime_visible_annotations_length = attribute_length;
1319 runtime_visible_annotations = cfs->current();
1320 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1321 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1322 parse_annotations(cp,
1323 runtime_visible_annotations,
1324 runtime_visible_annotations_length,
1325 parsed_annotations,
1326 _loader_data,
1327 _can_access_vm_annotations);
1328 cfs->skip_u1_fast(runtime_visible_annotations_length);
1329 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1330 if (runtime_invisible_annotations_exists) {
1331 classfile_parse_error(
1332 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1333 return;
1334 }
1335 runtime_invisible_annotations_exists = true;
1336 cfs->skip_u1(attribute_length, CHECK);
1337 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1338 if (runtime_visible_type_annotations != nullptr) {
1339 classfile_parse_error(
1340 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1341 return;
1342 }
1343 runtime_visible_type_annotations_length = attribute_length;
1344 runtime_visible_type_annotations = cfs->current();
1345 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1346 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1347 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1348 if (runtime_invisible_type_annotations_exists) {
1349 classfile_parse_error(
1350 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1351 return;
1352 } else {
1353 runtime_invisible_type_annotations_exists = true;
1354 }
1355 cfs->skip_u1(attribute_length, CHECK);
1356 } else {
1357 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1358 }
1359 } else {
1360 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1361 }
1362 }
1363
1364 *constantvalue_index_addr = constantvalue_index;
1365 *is_synthetic_addr = is_synthetic;
1366 *generic_signature_index_addr = generic_signature_index;
1367 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1368 runtime_visible_annotations_length,
1369 CHECK);
1370 parsed_annotations->set_field_annotations(a);
1371 a = allocate_annotations(runtime_visible_type_annotations,
1372 runtime_visible_type_annotations_length,
1373 CHECK);
1374 parsed_annotations->set_field_type_annotations(a);
1375 return;
1376 }
1377
1378
1379 // Side-effects: populates the _fields, _fields_annotations,
1380 // _fields_type_annotations fields
1381 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1382 AccessFlags class_access_flags,
1383 ConstantPool* cp,
1384 const int cp_size,
1385 u2* const java_fields_count_ptr,
1386 TRAPS) {
1387
1388 assert(cfs != nullptr, "invariant");
1389 assert(cp != nullptr, "invariant");
1390 assert(java_fields_count_ptr != nullptr, "invariant");
1391
1392 assert(nullptr == _fields_annotations, "invariant");
1393 assert(nullptr == _fields_type_annotations, "invariant");
1394
1395 // "inline type" means concrete value class
1396 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1397 // "value class" can be either abstract or concrete value class
1398 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1399 cfs->guarantee_more(2, CHECK); // length
1400 const u2 length = cfs->get_u2_fast();
1401 *java_fields_count_ptr = length;
1402
1403 int num_injected = 0;
1404 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1405 &num_injected);
1406
1407 // Two more slots are required for inline classes:
1408 // - The static field ".null_reset" which carries the nullable flat layout
1409 // representation of null, added below
1410 // - The nonstatic field ".empty" the JVM injects when detecting an empty
1411 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout
1412 // One more slot is required for both abstract value class and inline classes:
1413 // - The static field ".acmp_maps" for acmp and identity hash, tracks
1414 // nonstatic fields both inherited or declared, added below
1415 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1416 + (is_value_class ? 1 : 0);
1417
1418 // Allocate a temporary resource array to collect field data.
1419 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1420 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1421
1422 ResourceMark rm(THREAD);
1423 for (int n = 0; n < length; n++) {
1424 // access_flags, name_index, descriptor_index, attributes_count
1425 cfs->guarantee_more(8, CHECK);
1426
1427 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1428 if (!supports_inline_types()) {
1429 recognized_modifiers &= ~JVM_ACC_STRICT_INIT;
1430 }
1431
1432 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1433 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1434 AccessFlags access_flags;
1435 access_flags.set_flags(flags);
1436 FieldInfo::FieldFlags fieldFlags(0);
1437
1438 const u2 name_index = cfs->get_u2_fast();
1439 guarantee_property(valid_symbol_at(name_index),
1440 "Invalid constant pool index %u for field name in class file %s",
1441 name_index, CHECK);
1442 const Symbol* const name = cp->symbol_at(name_index);
1443 verify_legal_field_name(name, CHECK);
1444
1445 const u2 signature_index = cfs->get_u2_fast();
1446 guarantee_property(valid_symbol_at(signature_index),
1447 "Invalid constant pool index %u for field signature in class file %s",
1448 signature_index, CHECK);
1449 const Symbol* const sig = cp->symbol_at(signature_index);
1450 verify_legal_field_signature(name, sig, CHECK);
1451
1452 u2 constantvalue_index = 0;
1453 bool is_synthetic = false;
1454 u2 generic_signature_index = 0;
1455 const bool is_static = access_flags.is_static();
1456 FieldAnnotationCollector parsed_annotations(_loader_data);
1457
1458 bool is_null_restricted = false;
1459
1460 const u2 attributes_count = cfs->get_u2_fast();
1461 if (attributes_count > 0) {
1462 parse_field_attributes(cfs,
1463 attributes_count,
1464 is_static,
1465 signature_index,
1466 &constantvalue_index,
1467 &is_synthetic,
1468 &generic_signature_index,
1469 &parsed_annotations,
1470 CHECK);
1471
1472 if (parsed_annotations.field_annotations() != nullptr) {
1473 if (_fields_annotations == nullptr) {
1474 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1475 _loader_data, length, nullptr,
1476 CHECK);
1477 }
1478 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1479 parsed_annotations.set_field_annotations(nullptr);
1480 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1481 if (!Signature::has_envelope(sig)) {
1482 Exceptions::fthrow(
1483 THREAD_AND_LOCATION,
1484 vmSymbols::java_lang_ClassFormatError(),
1485 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1486 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1487 return;
1488 }
1489 if (!supports_inline_types()) {
1490 Exceptions::fthrow(
1491 THREAD_AND_LOCATION,
1492 vmSymbols::java_lang_ClassFormatError(),
1493 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file",
1494 class_name()->as_C_string(), name->as_C_string());
1495 return;
1496 }
1497
1498 if ((flags & JVM_ACC_STRICT_INIT) == 0) {
1499 // Inject STRICT_INIT and validate in context
1500 const jint patched_flags = flags | JVM_ACC_STRICT_INIT;
1501 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK);
1502 access_flags.set_flags(patched_flags);
1503 }
1504 is_null_restricted = true;
1505 }
1506 }
1507 if (parsed_annotations.field_type_annotations() != nullptr) {
1508 if (_fields_type_annotations == nullptr) {
1509 _fields_type_annotations =
1510 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1511 length,
1512 nullptr,
1513 CHECK);
1514 }
1515 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1516 parsed_annotations.set_field_type_annotations(nullptr);
1517 }
1518
1519 if (is_synthetic) {
1520 access_flags.set_is_synthetic();
1521 }
1522 if (generic_signature_index != 0) {
1523 fieldFlags.update_generic(true);
1524 }
1525 }
1526
1527 if (is_null_restricted) {
1528 fieldFlags.update_null_free_inline_type(true);
1529 if (is_static) {
1530 _has_null_restricted_static_fields = true;
1531 }
1532 }
1533
1534 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1535
1536 // Update number of static oop fields.
1537 if (is_static && is_reference_type(type)) {
1538 _static_oop_count++;
1539 }
1540
1541 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1542 fi.set_index(n);
1543 if (fieldFlags.is_generic()) {
1544 fi.set_generic_signature_index(generic_signature_index);
1545 }
1546 parsed_annotations.apply_to(&fi);
1547 if (fi.field_flags().is_contended()) {
1548 _has_contended_fields = true;
1549 }
1550 if (access_flags.is_strict() && access_flags.is_static()) {
1551 _has_strict_static_fields = true;
1552 }
1553 _temp_field_info->append(fi);
1554 }
1555 assert(_temp_field_info->length() == length, "Must be");
1556
1557 if (num_injected != 0) {
1558 for (int n = 0; n < num_injected; n++) {
1559 // Check for duplicates
1560 if (injected[n].may_be_java) {
1561 const Symbol* const name = injected[n].name();
1562 const Symbol* const signature = injected[n].signature();
1563 bool duplicate = false;
1564 for (int i = 0; i < length; i++) {
1565 const FieldInfo* const f = _temp_field_info->adr_at(i);
1566 if (name == cp->symbol_at(f->name_index()) &&
1567 signature == cp->symbol_at(f->signature_index())) {
1568 // Symbol is desclared in Java so skip this one
1569 duplicate = true;
1570 break;
1571 }
1572 }
1573 if (duplicate) {
1574 // These will be removed from the field array at the end
1575 continue;
1576 }
1577 }
1578
1579 // Injected field
1580 FieldInfo::FieldFlags fflags(0);
1581 fflags.update_injected(true);
1582 AccessFlags aflags;
1583 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1584 int idx = _temp_field_info->append(fi);
1585 _temp_field_info->adr_at(idx)->set_index(idx);
1586 }
1587 }
1588
1589 if (is_inline_type) {
1590 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1591 // It should never be seen by user code, it is used when writing "null" to a nullable flat field
1592 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1593 // alive.
1594 FieldInfo::FieldFlags fflags2(0);
1595 fflags2.update_injected(true);
1596 AccessFlags aflags2(JVM_ACC_STATIC);
1597 FieldInfo fi2(aflags2,
1598 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1599 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1600 0,
1601 fflags2);
1602 int idx2 = _temp_field_info->append(fi2);
1603 _temp_field_info->adr_at(idx2)->set_index(idx2);
1604 _static_oop_count++;
1605 }
1606 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1607 && _class_name != vmSymbols::java_lang_Object()) {
1608 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1609 FieldInfo::FieldFlags fflags2(0);
1610 fflags2.update_injected(true);
1611 fflags2.update_stable(true);
1612 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1613 FieldInfo fi3(aflags2,
1614 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1615 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1616 0,
1617 fflags2);
1618 int idx2 = _temp_field_info->append(fi3);
1619 _temp_field_info->adr_at(idx2)->set_index(idx2);
1620 _static_oop_count++;
1621 }
1622
1623 if (_need_verify && length > 1) {
1624 // Check duplicated fields
1625 ResourceMark rm(THREAD);
1626 // Set containing name-signature pairs
1627 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1628 for (int i = 0; i < _temp_field_info->length(); i++) {
1629 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1630 _temp_field_info->adr_at(i)->signature(_cp));
1631 // If no duplicates, add name/signature in hashtable names_and_sigs.
1632 if(!names_and_sigs->put(name_and_sig, 0)) {
1633 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1634 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1635 return;
1636 }
1637 }
1638 }
1639 }
1640
1641
1642 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1643 u4 code_length,
1644 u4 exception_table_length,
1645 TRAPS) {
1646 assert(cfs != nullptr, "invariant");
1647
1648 const unsafe_u2* const exception_table_start = cfs->current();
1649 assert(exception_table_start != nullptr, "null exception table");
1650
1651 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1652 // end_pc,
1653 // handler_pc,
1654 // catch_type_index
1655
1656 // Will check legal target after parsing code array in verifier.
1657 if (_need_verify) {
1658 for (unsigned int i = 0; i < exception_table_length; i++) {
1659 const u2 start_pc = cfs->get_u2_fast();
1660 const u2 end_pc = cfs->get_u2_fast();
1661 const u2 handler_pc = cfs->get_u2_fast();
1662 const u2 catch_type_index = cfs->get_u2_fast();
1663 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1664 "Illegal exception table range in class file %s",
1665 CHECK_NULL);
1666 guarantee_property(handler_pc < code_length,
1667 "Illegal exception table handler in class file %s",
1668 CHECK_NULL);
1669 if (catch_type_index != 0) {
1670 guarantee_property(valid_klass_reference_at(catch_type_index),
1671 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1672 }
1673 }
1674 } else {
1675 cfs->skip_u2_fast(exception_table_length * 4);
1676 }
1677 return exception_table_start;
1678 }
1679
1680 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1681 u4 code_length,
1682 CompressedLineNumberWriteStream**const write_stream,
1683 TRAPS) {
1684
1685 const ClassFileStream* const cfs = _stream;
1686 unsigned int num_entries = cfs->get_u2(CHECK);
1687
1688 // Each entry is a u2 start_pc, and a u2 line_number
1689 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1690
1691 // Verify line number attribute and table length
1692 guarantee_property(
1693 code_attribute_length == sizeof(u2) + length_in_bytes,
1694 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1695
1696 cfs->guarantee_more(length_in_bytes, CHECK);
1697
1698 if ((*write_stream) == nullptr) {
1699 if (length_in_bytes > fixed_buffer_size) {
1700 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1701 } else {
1702 (*write_stream) = new CompressedLineNumberWriteStream(
1703 _linenumbertable_buffer, fixed_buffer_size);
1704 }
1705 }
1706
1707 while (num_entries-- > 0) {
1708 const u2 bci = cfs->get_u2_fast(); // start_pc
1709 const u2 line = cfs->get_u2_fast(); // line_number
1710 guarantee_property(bci < code_length,
1711 "Invalid pc in LineNumberTable in class file %s", CHECK);
1712 (*write_stream)->write_pair(bci, line);
1713 }
1714 }
1715
1716
1717 class LVT_Hash : public AllStatic {
1718 public:
1719
1720 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1721 /*
1722 * 3-tuple start_bci/length/slot has to be unique key,
1723 * so the following comparison seems to be redundant:
1724 * && elem->name_cp_index == entry->_elem->name_cp_index
1725 */
1726 return (e0.start_bci == e1.start_bci &&
1727 e0.length == e1.length &&
1728 e0.name_cp_index == e1.name_cp_index &&
1729 e0.slot == e1.slot);
1730 }
1731
1732 static unsigned int hash(LocalVariableTableElement const& e0) {
1733 unsigned int raw_hash = e0.start_bci;
1734
1735 raw_hash = e0.length + raw_hash * 37;
1736 raw_hash = e0.name_cp_index + raw_hash * 37;
1737 raw_hash = e0.slot + raw_hash * 37;
1738
1739 return raw_hash;
1740 }
1741 };
1742
1743
1744 // Class file LocalVariableTable elements.
1745 class Classfile_LVT_Element {
1746 public:
1747 u2 start_bci;
1748 u2 length;
1749 u2 name_cp_index;
1750 u2 descriptor_cp_index;
1751 u2 slot;
1752 };
1753
1754 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1755 LocalVariableTableElement* const lvt) {
1756 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1757 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1758 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1759 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1760 lvt->signature_cp_index = 0;
1761 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1762 }
1763
1764 // Function is used to parse both attributes:
1765 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1766 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1767 u4 code_length,
1768 u2 max_locals,
1769 u4 code_attribute_length,
1770 u2* const localvariable_table_length,
1771 bool isLVTT,
1772 TRAPS) {
1773 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1774 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1775 const unsigned int size = checked_cast<unsigned>(
1776 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1777
1778 const ConstantPool* const cp = _cp;
1779
1780 // Verify local variable table attribute has right length
1781 if (_need_verify) {
1782 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1783 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1784 }
1785
1786 const unsafe_u2* const localvariable_table_start = cfs->current();
1787 assert(localvariable_table_start != nullptr, "null local variable table");
1788 if (!_need_verify) {
1789 cfs->skip_u2_fast(size);
1790 } else {
1791 cfs->guarantee_more(size * 2, CHECK_NULL);
1792 for(int i = 0; i < (*localvariable_table_length); i++) {
1793 const u2 start_pc = cfs->get_u2_fast();
1794 const u2 length = cfs->get_u2_fast();
1795 const u2 name_index = cfs->get_u2_fast();
1796 const u2 descriptor_index = cfs->get_u2_fast();
1797 const u2 index = cfs->get_u2_fast();
1798 // Assign to a u4 to avoid overflow
1799 const u4 end_pc = (u4)start_pc + (u4)length;
1800
1801 if (start_pc >= code_length) {
1802 classfile_parse_error(
1803 "Invalid start_pc %u in %s in class file %s",
1804 start_pc, tbl_name, THREAD);
1805 return nullptr;
1806 }
1807 if (end_pc > code_length) {
1808 classfile_parse_error(
1809 "Invalid length %u in %s in class file %s",
1810 length, tbl_name, THREAD);
1811 return nullptr;
1812 }
1813 const int cp_size = cp->length();
1814 guarantee_property(valid_symbol_at(name_index),
1815 "Name index %u in %s has bad constant type in class file %s",
1816 name_index, tbl_name, CHECK_NULL);
1817 guarantee_property(valid_symbol_at(descriptor_index),
1818 "Signature index %u in %s has bad constant type in class file %s",
1819 descriptor_index, tbl_name, CHECK_NULL);
1820
1821 const Symbol* const name = cp->symbol_at(name_index);
1822 const Symbol* const sig = cp->symbol_at(descriptor_index);
1823 verify_legal_field_name(name, CHECK_NULL);
1824 u2 extra_slot = 0;
1825 if (!isLVTT) {
1826 verify_legal_field_signature(name, sig, CHECK_NULL);
1827
1828 // 4894874: check special cases for double and long local variables
1829 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1830 sig == vmSymbols::type_signature(T_LONG)) {
1831 extra_slot = 1;
1832 }
1833 }
1834 guarantee_property((index + extra_slot) < max_locals,
1835 "Invalid index %u in %s in class file %s",
1836 index, tbl_name, CHECK_NULL);
1837 }
1838 }
1839 return localvariable_table_start;
1840 }
1841
1842 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1843 u4 code_attribute_length,
1844 TRAPS) {
1845 assert(cfs != nullptr, "invariant");
1846
1847 if (0 == code_attribute_length) {
1848 return nullptr;
1849 }
1850
1851 const u1* const stackmap_table_start = cfs->current();
1852 assert(stackmap_table_start != nullptr, "null stackmap table");
1853
1854 // check code_attribute_length
1855 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1856
1857 return stackmap_table_start;
1858 }
1859
1860 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1861 u2* const checked_exceptions_length,
1862 u4 method_attribute_length,
1863 TRAPS) {
1864 assert(cfs != nullptr, "invariant");
1865 assert(checked_exceptions_length != nullptr, "invariant");
1866
1867 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1868 *checked_exceptions_length = cfs->get_u2_fast();
1869 const unsigned int size =
1870 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1871 const unsafe_u2* const checked_exceptions_start = cfs->current();
1872 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1873 if (!_need_verify) {
1874 cfs->skip_u2_fast(size);
1875 } else {
1876 // Verify each value in the checked exception table
1877 u2 checked_exception;
1878 const u2 len = *checked_exceptions_length;
1879 cfs->guarantee_more(2 * len, CHECK_NULL);
1880 for (int i = 0; i < len; i++) {
1881 checked_exception = cfs->get_u2_fast();
1882 guarantee_property(
1883 valid_klass_reference_at(checked_exception),
1884 "Exception name has bad type at constant pool %u in class file %s",
1885 checked_exception, CHECK_NULL);
1886 }
1887 }
1888 // check exceptions attribute length
1889 if (_need_verify) {
1890 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1891 sizeof(u2) * size),
1892 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1893 }
1894 return checked_exceptions_start;
1895 }
1896
1897 void ClassFileParser::throwIllegalSignature(const char* type,
1898 const Symbol* name,
1899 const Symbol* sig,
1900 TRAPS) const {
1901 assert(name != nullptr, "invariant");
1902 assert(sig != nullptr, "invariant");
1903
1904 ResourceMark rm(THREAD);
1905 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1906 Exceptions::fthrow(THREAD_AND_LOCATION,
1907 vmSymbols::java_lang_ClassFormatError(),
1908 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1909 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1910 }
1911
1912 AnnotationCollector::ID
1913 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1914 const Symbol* name,
1915 const bool can_access_vm_annotations) {
1916 const vmSymbolID sid = vmSymbols::find_sid(name);
1917 // Privileged code can use all annotations. Other code silently drops some.
1918 const bool privileged = loader_data->is_boot_class_loader_data() ||
1919 loader_data->is_platform_class_loader_data() ||
1920 can_access_vm_annotations;
1921 switch (sid) {
1922 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1923 if (_location != _in_method) break; // only allow for methods
1924 if (!privileged) break; // only allow in privileged code
1925 return _method_CallerSensitive;
1926 }
1927 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1928 if (_location != _in_method) break; // only allow for methods
1929 if (!privileged) break; // only allow in privileged code
1930 return _method_ForceInline;
1931 }
1932 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1933 if (_location != _in_method) break; // only allow for methods
1934 if (!privileged) break; // only allow in privileged code
1935 return _method_DontInline;
1936 }
1937 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1938 if (_location != _in_method) break; // only allow for methods
1939 if (!privileged) break; // only allow in privileged code
1940 return _method_ChangesCurrentThread;
1941 }
1942 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1943 if (_location != _in_method) break; // only allow for methods
1944 if (!privileged) break; // only allow in privileged code
1945 return _method_JvmtiHideEvents;
1946 }
1947 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1948 if (_location != _in_method) break; // only allow for methods
1949 if (!privileged) break; // only allow in privileged code
1950 return _method_JvmtiMountTransition;
1951 }
1952 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1953 if (_location != _in_method) break; // only allow for methods
1954 if (!privileged) break; // only allow in privileged code
1955 return _method_InjectedProfile;
1956 }
1957 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1958 if (_location != _in_method) break; // only allow for methods
1959 if (!privileged) break; // only allow in privileged code
1960 return _method_LambdaForm_Compiled;
1961 }
1962 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1963 if (_location != _in_method) break; // only allow for methods
1964 if (!privileged) break; // only allow in privileged code
1965 return _method_Hidden;
1966 }
1967 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1968 if (_location != _in_method) break; // only allow for methods
1969 if (!privileged) break; // only allow in privileged code
1970 return _method_Scoped;
1971 }
1972 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1973 if (_location != _in_method) break; // only allow for methods
1974 if (!privileged) break; // only allow in privileged code
1975 return _method_IntrinsicCandidate;
1976 }
1977 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1978 if (_location != _in_field) break; // only allow for fields
1979 if (!privileged) break; // only allow in privileged code
1980 return _field_Stable;
1981 }
1982 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_TrustFinalFields_signature): {
1983 if (_location != _in_class) break; // only allow for classes
1984 if (!privileged) break; // only allow in privileged code
1985 return _jdk_internal_vm_annotation_TrustFinalFields;
1986 }
1987 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1988 if (_location != _in_field && _location != _in_class) {
1989 break; // only allow for fields and classes
1990 }
1991 if (!EnableContended || (RestrictContended && !privileged)) {
1992 break; // honor privileges
1993 }
1994 return _jdk_internal_vm_annotation_Contended;
1995 }
1996 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1997 if (_location != _in_method) break; // only allow for methods
1998 if (RestrictReservedStack && !privileged) break; // honor privileges
1999 return _jdk_internal_vm_annotation_ReservedStackAccess;
2000 }
2001 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
2002 if (_location != _in_class) break; // only allow for classes
2003 if (!privileged) break; // only allow in privileged code
2004 return _jdk_internal_ValueBased;
2005 }
2006 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2007 if (_location != _in_class) break; // only allow for classes
2008 return _jdk_internal_LooselyConsistentValue;
2009 }
2010 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2011 if (_location != _in_field) break; // only allow for fields
2012 return _jdk_internal_NullRestricted;
2013 }
2014 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2015 return _java_lang_Deprecated;
2016 }
2017 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2018 if (_location != _in_class) break; // only allow for classes
2019 if (!privileged) break; // only allow in privileged code
2020 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2021 }
2022 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2023 if (_location != _in_method) break; // only allow for methods
2024 if (!privileged) break; // only allow in privileged code
2025 return _method_AOTRuntimeSetup;
2026 }
2027 default: {
2028 break;
2029 }
2030 }
2031 return AnnotationCollector::_unknown;
2032 }
2033
2034 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2035 if (is_contended())
2036 // Setting the contended group also sets the contended bit in field flags
2037 f->set_contended_group(contended_group());
2038 if (is_stable())
2039 (f->field_flags_addr())->update_stable(true);
2040 }
2041
2042 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2043 // If there's an error deallocate metadata for field annotations
2044 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2045 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2046 }
2047
2048 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2049 if (has_annotation(_method_CallerSensitive))
2050 m->set_caller_sensitive();
2051 if (has_annotation(_method_ForceInline))
2052 m->set_force_inline();
2053 if (has_annotation(_method_DontInline))
2054 m->set_dont_inline();
2055 if (has_annotation(_method_ChangesCurrentThread))
2056 m->set_changes_current_thread();
2057 if (has_annotation(_method_JvmtiHideEvents))
2058 m->set_jvmti_hide_events();
2059 if (has_annotation(_method_JvmtiMountTransition))
2060 m->set_jvmti_mount_transition();
2061 if (has_annotation(_method_InjectedProfile))
2062 m->set_has_injected_profile();
2063 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2064 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2065 if (has_annotation(_method_Hidden))
2066 m->set_is_hidden();
2067 if (has_annotation(_method_Scoped))
2068 m->set_scoped();
2069 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2070 m->set_intrinsic_candidate();
2071 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2072 m->set_has_reserved_stack_access();
2073 if (has_annotation(_java_lang_Deprecated))
2074 m->set_deprecated();
2075 if (has_annotation(_java_lang_Deprecated_for_removal))
2076 m->set_deprecated_for_removal();
2077 }
2078
2079 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2080 assert(ik != nullptr, "invariant");
2081 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2082 ik->set_is_contended(is_contended());
2083 }
2084 if (has_annotation(_jdk_internal_ValueBased)) {
2085 ik->set_has_value_based_class_annotation();
2086 if (DiagnoseSyncOnValueBasedClasses) {
2087 ik->set_is_value_based();
2088 }
2089 }
2090 if (has_annotation(_java_lang_Deprecated)) {
2091 Array<Method*>* methods = ik->methods();
2092 int length = ik->methods()->length();
2093 for (int i = 0; i < length; i++) {
2094 Method* m = methods->at(i);
2095 m->set_deprecated();
2096 }
2097 }
2098 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2099 Array<Method*>* methods = ik->methods();
2100 int length = ik->methods()->length();
2101 for (int i = 0; i < length; i++) {
2102 Method* m = methods->at(i);
2103 m->set_deprecated_for_removal();
2104 }
2105 }
2106 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) {
2107 ik->set_has_aot_safe_initializer();
2108 }
2109 if (has_annotation(_jdk_internal_vm_annotation_TrustFinalFields)) {
2110 ik->set_trust_final_fields(true);
2111 }
2112 }
2113
2114 #define MAX_ARGS_SIZE 255
2115 #define MAX_CODE_SIZE 65535
2116 #define INITIAL_MAX_LVT_NUMBER 256
2117
2118 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2119 *
2120 * Rules for LVT's and LVTT's are:
2121 * - There can be any number of LVT's and LVTT's.
2122 * - If there are n LVT's, it is the same as if there was just
2123 * one LVT containing all the entries from the n LVT's.
2124 * - There may be no more than one LVT entry per local variable.
2125 * Two LVT entries are 'equal' if these fields are the same:
2126 * start_pc, length, name, slot
2127 * - There may be no more than one LVTT entry per each LVT entry.
2128 * Each LVTT entry has to match some LVT entry.
2129 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2130 */
2131 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2132 int lvt_cnt,
2133 u2* const localvariable_table_length,
2134 const unsafe_u2** const localvariable_table_start,
2135 int lvtt_cnt,
2136 u2* const localvariable_type_table_length,
2137 const unsafe_u2** const localvariable_type_table_start,
2138 TRAPS) {
2139
2140 ResourceMark rm(THREAD);
2141
2142 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*,
2143 256, AnyObj::RESOURCE_AREA, mtInternal,
2144 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2145
2146 LVT_HashTable* const table = new LVT_HashTable();
2147
2148 // To fill LocalVariableTable in
2149 const Classfile_LVT_Element* cf_lvt;
2150 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2151
2152 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2153 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2154 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2155 copy_lvt_element(&cf_lvt[idx], lvt);
2156 // If no duplicates, add LVT elem in hashtable.
2157 if (table->put(*lvt, lvt) == false
2158 && _need_verify
2159 && _major_version >= JAVA_1_5_VERSION) {
2160 classfile_parse_error("Duplicated LocalVariableTable attribute "
2161 "entry for '%s' in class file %s",
2162 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2163 THREAD);
2164 return;
2165 }
2166 }
2167 }
2168
2169 // To merge LocalVariableTable and LocalVariableTypeTable
2170 const Classfile_LVT_Element* cf_lvtt;
2171 LocalVariableTableElement lvtt_elem;
2172
2173 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2174 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2175 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2176 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2177 LocalVariableTableElement** entry = table->get(lvtt_elem);
2178 if (entry == nullptr) {
2179 if (_need_verify) {
2180 classfile_parse_error("LVTT entry for '%s' in class file %s "
2181 "does not match any LVT entry",
2182 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2183 THREAD);
2184 return;
2185 }
2186 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2187 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2188 "entry for '%s' in class file %s",
2189 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2190 THREAD);
2191 return;
2192 } else {
2193 // to add generic signatures into LocalVariableTable
2194 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2195 }
2196 }
2197 }
2198 }
2199
2200
2201 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2202 const u1* runtime_visible_annotations,
2203 int runtime_visible_annotations_length,
2204 const u1* runtime_visible_parameter_annotations,
2205 int runtime_visible_parameter_annotations_length,
2206 const u1* runtime_visible_type_annotations,
2207 int runtime_visible_type_annotations_length,
2208 const u1* annotation_default,
2209 int annotation_default_length,
2210 TRAPS) {
2211
2212 AnnotationArray* a;
2213
2214 if (runtime_visible_annotations_length > 0) {
2215 a = allocate_annotations(runtime_visible_annotations,
2216 runtime_visible_annotations_length,
2217 CHECK);
2218 cm->set_method_annotations(a);
2219 }
2220
2221 if (runtime_visible_parameter_annotations_length > 0) {
2222 a = allocate_annotations(runtime_visible_parameter_annotations,
2223 runtime_visible_parameter_annotations_length,
2224 CHECK);
2225 cm->set_parameter_annotations(a);
2226 }
2227
2228 if (annotation_default_length > 0) {
2229 a = allocate_annotations(annotation_default,
2230 annotation_default_length,
2231 CHECK);
2232 cm->set_default_annotations(a);
2233 }
2234
2235 if (runtime_visible_type_annotations_length > 0) {
2236 a = allocate_annotations(runtime_visible_type_annotations,
2237 runtime_visible_type_annotations_length,
2238 CHECK);
2239 cm->set_type_annotations(a);
2240 }
2241 }
2242
2243
2244 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2245 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2246 // Method* to save footprint, so we only know the size of the resulting Method* when the
2247 // entire method attribute is parsed.
2248 //
2249 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2250
2251 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2252 bool is_interface,
2253 const ConstantPool* cp,
2254 bool* const has_localvariable_table,
2255 TRAPS) {
2256 assert(cfs != nullptr, "invariant");
2257 assert(cp != nullptr, "invariant");
2258 assert(has_localvariable_table != nullptr, "invariant");
2259
2260 ResourceMark rm(THREAD);
2261 // Parse fixed parts:
2262 // access_flags, name_index, descriptor_index, attributes_count
2263 cfs->guarantee_more(8, CHECK_NULL);
2264
2265 u2 flags = cfs->get_u2_fast();
2266 const u2 name_index = cfs->get_u2_fast();
2267 const int cp_size = cp->length();
2268 guarantee_property(
2269 valid_symbol_at(name_index),
2270 "Illegal constant pool index %u for method name in class file %s",
2271 name_index, CHECK_NULL);
2272 const Symbol* const name = cp->symbol_at(name_index);
2273 verify_legal_method_name(name, CHECK_NULL);
2274
2275 const u2 signature_index = cfs->get_u2_fast();
2276 guarantee_property(
2277 valid_symbol_at(signature_index),
2278 "Illegal constant pool index %u for method signature in class file %s",
2279 signature_index, CHECK_NULL);
2280 const Symbol* const signature = cp->symbol_at(signature_index);
2281
2282 if (name == vmSymbols::class_initializer_name()) {
2283 // We ignore the other access flags for a valid class initializer.
2284 // (JVM Spec 2nd ed., chapter 4.6)
2285 if (_major_version < 51) { // backward compatibility
2286 flags = JVM_ACC_STATIC;
2287 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2288 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2289 } else {
2290 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2291 return nullptr;
2292 }
2293 } else {
2294 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL);
2295 }
2296
2297 if (name == vmSymbols::object_initializer_name() && is_interface) {
2298 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2299 return nullptr;
2300 }
2301
2302 if (Arguments::is_valhalla_enabled()) {
2303 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2304 && ((flags & JVM_ACC_STATIC) == 0 )
2305 && !_access_flags.is_identity_class()) {
2306 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2307 return nullptr;
2308 }
2309 }
2310
2311 int args_size = -1; // only used when _need_verify is true
2312 if (_need_verify) {
2313 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2314 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2315 verify_legal_method_signature(name, signature, CHECK_NULL);
2316 if (args_size > MAX_ARGS_SIZE) {
2317 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2318 return nullptr;
2319 }
2320 }
2321
2322 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2323
2324 // Default values for code and exceptions attribute elements
2325 u2 max_stack = 0;
2326 u2 max_locals = 0;
2327 u4 code_length = 0;
2328 const u1* code_start = nullptr;
2329 u2 exception_table_length = 0;
2330 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2331 Array<int>* exception_handlers = Universe::the_empty_int_array();
2332 u2 checked_exceptions_length = 0;
2333 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2334 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2335 int linenumber_table_length = 0;
2336 int total_lvt_length = 0;
2337 u2 lvt_cnt = 0;
2338 u2 lvtt_cnt = 0;
2339 bool lvt_allocated = false;
2340 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2341 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2342 u2* localvariable_table_length = nullptr;
2343 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2344 u2* localvariable_type_table_length = nullptr;
2345 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2346 int method_parameters_length = -1;
2347 const u1* method_parameters_data = nullptr;
2348 bool method_parameters_seen = false;
2349 bool parsed_code_attribute = false;
2350 bool parsed_checked_exceptions_attribute = false;
2351 bool parsed_stackmap_attribute = false;
2352 // stackmap attribute - JDK1.5
2353 const u1* stackmap_data = nullptr;
2354 int stackmap_data_length = 0;
2355 u2 generic_signature_index = 0;
2356 MethodAnnotationCollector parsed_annotations;
2357 const u1* runtime_visible_annotations = nullptr;
2358 int runtime_visible_annotations_length = 0;
2359 const u1* runtime_visible_parameter_annotations = nullptr;
2360 int runtime_visible_parameter_annotations_length = 0;
2361 const u1* runtime_visible_type_annotations = nullptr;
2362 int runtime_visible_type_annotations_length = 0;
2363 bool runtime_invisible_annotations_exists = false;
2364 bool runtime_invisible_type_annotations_exists = false;
2365 bool runtime_invisible_parameter_annotations_exists = false;
2366 const u1* annotation_default = nullptr;
2367 int annotation_default_length = 0;
2368
2369 // Parse code and exceptions attribute
2370 u2 method_attributes_count = cfs->get_u2_fast();
2371 while (method_attributes_count--) {
2372 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2373 const u2 method_attribute_name_index = cfs->get_u2_fast();
2374 const u4 method_attribute_length = cfs->get_u4_fast();
2375 guarantee_property(
2376 valid_symbol_at(method_attribute_name_index),
2377 "Invalid method attribute name index %u in class file %s",
2378 method_attribute_name_index, CHECK_NULL);
2379
2380 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2381 if (method_attribute_name == vmSymbols::tag_code()) {
2382 // Parse Code attribute
2383 if (_need_verify) {
2384 guarantee_property(
2385 !access_flags.is_native() && !access_flags.is_abstract(),
2386 "Code attribute in native or abstract methods in class file %s",
2387 CHECK_NULL);
2388 }
2389 if (parsed_code_attribute) {
2390 classfile_parse_error("Multiple Code attributes in class file %s",
2391 THREAD);
2392 return nullptr;
2393 }
2394 parsed_code_attribute = true;
2395
2396 // Stack size, locals size, and code size
2397 cfs->guarantee_more(8, CHECK_NULL);
2398 max_stack = cfs->get_u2_fast();
2399 max_locals = cfs->get_u2_fast();
2400 code_length = cfs->get_u4_fast();
2401 if (_need_verify) {
2402 guarantee_property(args_size <= max_locals,
2403 "Arguments can't fit into locals in class file %s",
2404 CHECK_NULL);
2405 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2406 "Invalid method Code length %u in class file %s",
2407 code_length, CHECK_NULL);
2408 }
2409 // Code pointer
2410 code_start = cfs->current();
2411 assert(code_start != nullptr, "null code start");
2412 cfs->guarantee_more(code_length, CHECK_NULL);
2413 cfs->skip_u1_fast(code_length);
2414
2415 // Exception handler table
2416 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2417 exception_table_length = cfs->get_u2_fast();
2418 if (exception_table_length > 0) {
2419 exception_table_start = parse_exception_table(cfs,
2420 code_length,
2421 exception_table_length,
2422 CHECK_NULL);
2423 }
2424
2425 // Parse additional attributes in code attribute
2426 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2427 u2 code_attributes_count = cfs->get_u2_fast();
2428
2429 unsigned int calculated_attribute_length = 0;
2430
2431 calculated_attribute_length =
2432 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2433 calculated_attribute_length += checked_cast<unsigned int>(
2434 code_length +
2435 sizeof(exception_table_length) +
2436 sizeof(code_attributes_count) +
2437 exception_table_length *
2438 ( sizeof(u2) + // start_pc
2439 sizeof(u2) + // end_pc
2440 sizeof(u2) + // handler_pc
2441 sizeof(u2) )); // catch_type_index
2442
2443 while (code_attributes_count--) {
2444 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2445 const u2 code_attribute_name_index = cfs->get_u2_fast();
2446 const u4 code_attribute_length = cfs->get_u4_fast();
2447 calculated_attribute_length += code_attribute_length +
2448 (unsigned)sizeof(code_attribute_name_index) +
2449 (unsigned)sizeof(code_attribute_length);
2450 guarantee_property(valid_symbol_at(code_attribute_name_index),
2451 "Invalid code attribute name index %u in class file %s",
2452 code_attribute_name_index,
2453 CHECK_NULL);
2454 if (LoadLineNumberTables &&
2455 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2456 // Parse and compress line number table
2457 parse_linenumber_table(code_attribute_length,
2458 code_length,
2459 &linenumber_table,
2460 CHECK_NULL);
2461
2462 } else if (LoadLocalVariableTables &&
2463 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2464 // Parse local variable table
2465 if (!lvt_allocated) {
2466 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2467 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2468 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2469 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2470 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2471 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2472 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2473 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2474 lvt_allocated = true;
2475 }
2476 if (lvt_cnt == max_lvt_cnt) {
2477 max_lvt_cnt <<= 1;
2478 localvariable_table_length = REALLOC_RESOURCE_ARRAY(localvariable_table_length, lvt_cnt, max_lvt_cnt);
2479 localvariable_table_start = REALLOC_RESOURCE_ARRAY(localvariable_table_start, lvt_cnt, max_lvt_cnt);
2480 }
2481 localvariable_table_start[lvt_cnt] =
2482 parse_localvariable_table(cfs,
2483 code_length,
2484 max_locals,
2485 code_attribute_length,
2486 &localvariable_table_length[lvt_cnt],
2487 false, // is not LVTT
2488 CHECK_NULL);
2489 total_lvt_length += localvariable_table_length[lvt_cnt];
2490 lvt_cnt++;
2491 } else if (LoadLocalVariableTypeTables &&
2492 _major_version >= JAVA_1_5_VERSION &&
2493 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2494 if (!lvt_allocated) {
2495 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2496 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2497 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2498 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2499 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2500 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2501 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2502 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2503 lvt_allocated = true;
2504 }
2505 // Parse local variable type table
2506 if (lvtt_cnt == max_lvtt_cnt) {
2507 max_lvtt_cnt <<= 1;
2508 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2509 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2510 }
2511 localvariable_type_table_start[lvtt_cnt] =
2512 parse_localvariable_table(cfs,
2513 code_length,
2514 max_locals,
2515 code_attribute_length,
2516 &localvariable_type_table_length[lvtt_cnt],
2517 true, // is LVTT
2518 CHECK_NULL);
2519 lvtt_cnt++;
2520 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2521 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2522 // Stack map is only needed by the new verifier in JDK1.5.
2523 if (parsed_stackmap_attribute) {
2524 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2525 return nullptr;
2526 }
2527 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2528 stackmap_data_length = code_attribute_length;
2529 parsed_stackmap_attribute = true;
2530 } else {
2531 // Skip unknown attributes
2532 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2533 }
2534 }
2535 // check method attribute length
2536 if (_need_verify) {
2537 guarantee_property(method_attribute_length == calculated_attribute_length,
2538 "Code segment has wrong length in class file %s",
2539 CHECK_NULL);
2540 }
2541 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2542 // Parse Exceptions attribute
2543 if (parsed_checked_exceptions_attribute) {
2544 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2545 THREAD);
2546 return nullptr;
2547 }
2548 parsed_checked_exceptions_attribute = true;
2549 checked_exceptions_start =
2550 parse_checked_exceptions(cfs,
2551 &checked_exceptions_length,
2552 method_attribute_length,
2553 CHECK_NULL);
2554 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2555 // reject multiple method parameters
2556 if (method_parameters_seen) {
2557 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2558 THREAD);
2559 return nullptr;
2560 }
2561 method_parameters_seen = true;
2562 method_parameters_length = cfs->get_u1_fast();
2563 const u4 real_length = (method_parameters_length * 4u) + 1u;
2564 if (method_attribute_length != real_length) {
2565 classfile_parse_error(
2566 "Invalid MethodParameters method attribute length %u in class file",
2567 method_attribute_length, THREAD);
2568 return nullptr;
2569 }
2570 method_parameters_data = cfs->current();
2571 cfs->skip_u2_fast(method_parameters_length);
2572 cfs->skip_u2_fast(method_parameters_length);
2573 // ignore this attribute if it cannot be reflected
2574 if (!vmClasses::reflect_Parameter_klass_is_loaded())
2575 method_parameters_length = -1;
2576 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2577 if (method_attribute_length != 0) {
2578 classfile_parse_error(
2579 "Invalid Synthetic method attribute length %u in class file %s",
2580 method_attribute_length, THREAD);
2581 return nullptr;
2582 }
2583 // Should we check that there hasn't already been a synthetic attribute?
2584 access_flags.set_is_synthetic();
2585 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2586 if (method_attribute_length != 0) {
2587 classfile_parse_error(
2588 "Invalid Deprecated method attribute length %u in class file %s",
2589 method_attribute_length, THREAD);
2590 return nullptr;
2591 }
2592 } else if (_major_version >= JAVA_1_5_VERSION) {
2593 if (method_attribute_name == vmSymbols::tag_signature()) {
2594 if (generic_signature_index != 0) {
2595 classfile_parse_error(
2596 "Multiple Signature attributes for method in class file %s",
2597 THREAD);
2598 return nullptr;
2599 }
2600 if (method_attribute_length != 2) {
2601 classfile_parse_error(
2602 "Invalid Signature attribute length %u in class file %s",
2603 method_attribute_length, THREAD);
2604 return nullptr;
2605 }
2606 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2607 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2608 if (runtime_visible_annotations != nullptr) {
2609 classfile_parse_error(
2610 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2611 THREAD);
2612 return nullptr;
2613 }
2614 runtime_visible_annotations_length = method_attribute_length;
2615 runtime_visible_annotations = cfs->current();
2616 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2617 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2618 parse_annotations(cp,
2619 runtime_visible_annotations,
2620 runtime_visible_annotations_length,
2621 &parsed_annotations,
2622 _loader_data,
2623 _can_access_vm_annotations);
2624 cfs->skip_u1_fast(runtime_visible_annotations_length);
2625 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2626 if (runtime_invisible_annotations_exists) {
2627 classfile_parse_error(
2628 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2629 THREAD);
2630 return nullptr;
2631 }
2632 runtime_invisible_annotations_exists = true;
2633 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2634 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2635 if (runtime_visible_parameter_annotations != nullptr) {
2636 classfile_parse_error(
2637 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2638 THREAD);
2639 return nullptr;
2640 }
2641 runtime_visible_parameter_annotations_length = method_attribute_length;
2642 runtime_visible_parameter_annotations = cfs->current();
2643 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2644 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2645 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2646 if (runtime_invisible_parameter_annotations_exists) {
2647 classfile_parse_error(
2648 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2649 THREAD);
2650 return nullptr;
2651 }
2652 runtime_invisible_parameter_annotations_exists = true;
2653 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2654 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2655 if (annotation_default != nullptr) {
2656 classfile_parse_error(
2657 "Multiple AnnotationDefault attributes for method in class file %s",
2658 THREAD);
2659 return nullptr;
2660 }
2661 annotation_default_length = method_attribute_length;
2662 annotation_default = cfs->current();
2663 assert(annotation_default != nullptr, "null annotation default");
2664 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2665 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2666 if (runtime_visible_type_annotations != nullptr) {
2667 classfile_parse_error(
2668 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2669 THREAD);
2670 return nullptr;
2671 }
2672 runtime_visible_type_annotations_length = method_attribute_length;
2673 runtime_visible_type_annotations = cfs->current();
2674 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2675 // No need for the VM to parse Type annotations
2676 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2677 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2678 if (runtime_invisible_type_annotations_exists) {
2679 classfile_parse_error(
2680 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2681 THREAD);
2682 return nullptr;
2683 }
2684 runtime_invisible_type_annotations_exists = true;
2685 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2686 } else {
2687 // Skip unknown attributes
2688 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2689 }
2690 } else {
2691 // Skip unknown attributes
2692 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2693 }
2694 }
2695
2696 if (linenumber_table != nullptr) {
2697 linenumber_table->write_terminator();
2698 linenumber_table_length = linenumber_table->position();
2699 }
2700
2701 // Make sure there's at least one Code attribute in non-native/non-abstract method
2702 if (_need_verify) {
2703 guarantee_property(access_flags.is_native() ||
2704 access_flags.is_abstract() ||
2705 parsed_code_attribute,
2706 "Absent Code attribute in method that is not native or abstract in class file %s",
2707 CHECK_NULL);
2708 }
2709
2710 // All sizing information for a Method* is finally available, now create it
2711 InlineTableSizes sizes(
2712 total_lvt_length,
2713 linenumber_table_length,
2714 exception_table_length,
2715 checked_exceptions_length,
2716 method_parameters_length,
2717 generic_signature_index,
2718 runtime_visible_annotations_length,
2719 runtime_visible_parameter_annotations_length,
2720 runtime_visible_type_annotations_length,
2721 annotation_default_length,
2722 0);
2723
2724 Method* const m = Method::allocate(_loader_data,
2725 code_length,
2726 access_flags,
2727 &sizes,
2728 ConstMethod::NORMAL,
2729 _cp->symbol_at(name_index),
2730 CHECK_NULL);
2731
2732 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2733
2734 // Fill in information from fixed part (access_flags already set)
2735 m->set_constants(_cp);
2736 m->set_name_index(name_index);
2737 m->set_signature_index(signature_index);
2738 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2739 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2740
2741 // Fill in code attribute information
2742 m->set_max_stack(max_stack);
2743 m->set_max_locals(max_locals);
2744 if (stackmap_data != nullptr) {
2745 m->constMethod()->copy_stackmap_data(_loader_data,
2746 (u1*)stackmap_data,
2747 stackmap_data_length,
2748 CHECK_NULL);
2749 }
2750
2751 // Copy byte codes
2752 m->set_code((u1*)code_start);
2753
2754 // Copy line number table
2755 if (linenumber_table != nullptr) {
2756 memcpy(m->compressed_linenumber_table(),
2757 linenumber_table->buffer(),
2758 linenumber_table_length);
2759 }
2760
2761 // Copy exception table
2762 if (exception_table_length > 0) {
2763 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2764 m->exception_table_start(),
2765 exception_table_length * sizeof(ExceptionTableElement),
2766 sizeof(u2));
2767 }
2768
2769 // Copy method parameters
2770 if (method_parameters_length > 0) {
2771 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2772 for (int i = 0; i < method_parameters_length; i++) {
2773 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2774 method_parameters_data += 2;
2775 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2776 method_parameters_data += 2;
2777 }
2778 }
2779
2780 // Copy checked exceptions
2781 if (checked_exceptions_length > 0) {
2782 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2783 m->checked_exceptions_start(),
2784 checked_exceptions_length * sizeof(CheckedExceptionElement),
2785 sizeof(u2));
2786 }
2787
2788 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2789 if (total_lvt_length > 0) {
2790 *has_localvariable_table = true;
2791 copy_localvariable_table(m->constMethod(),
2792 lvt_cnt,
2793 localvariable_table_length,
2794 localvariable_table_start,
2795 lvtt_cnt,
2796 localvariable_type_table_length,
2797 localvariable_type_table_start,
2798 CHECK_NULL);
2799 }
2800
2801 if (parsed_annotations.has_any_annotations())
2802 parsed_annotations.apply_to(methodHandle(THREAD, m));
2803
2804 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2805 m->set_is_hidden();
2806 }
2807 if (parsed_annotations.has_aot_runtime_setup()) {
2808 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() ||
2809 !access_flags.is_private() || !access_flags.is_static()) {
2810 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL);
2811 }
2812 _has_aot_runtime_setup_method = true;
2813 }
2814
2815 // Copy annotations
2816 copy_method_annotations(m->constMethod(),
2817 runtime_visible_annotations,
2818 runtime_visible_annotations_length,
2819 runtime_visible_parameter_annotations,
2820 runtime_visible_parameter_annotations_length,
2821 runtime_visible_type_annotations,
2822 runtime_visible_type_annotations_length,
2823 annotation_default,
2824 annotation_default_length,
2825 CHECK_NULL);
2826
2827 if (InstanceKlass::is_finalization_enabled() &&
2828 name == vmSymbols::finalize_method_name() &&
2829 signature == vmSymbols::void_method_signature()) {
2830 if (m->is_empty_method()) {
2831 _has_empty_finalizer = true;
2832 } else {
2833 _has_finalizer = true;
2834 }
2835 }
2836
2837 NOT_PRODUCT(m->verify());
2838 return m;
2839 }
2840
2841
2842 // Side-effects: populates the _methods field in the parser
2843 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2844 bool is_interface,
2845 bool* const has_localvariable_table,
2846 bool* has_final_method,
2847 bool* declares_nonstatic_concrete_methods,
2848 TRAPS) {
2849 assert(cfs != nullptr, "invariant");
2850 assert(has_localvariable_table != nullptr, "invariant");
2851 assert(has_final_method != nullptr, "invariant");
2852 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2853
2854 assert(nullptr == _methods, "invariant");
2855
2856 cfs->guarantee_more(2, CHECK); // length
2857 const u2 length = cfs->get_u2_fast();
2858 if (length == 0) {
2859 _methods = Universe::the_empty_method_array();
2860 } else {
2861 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2862 length,
2863 nullptr,
2864 CHECK);
2865
2866 for (int index = 0; index < length; index++) {
2867 Method* method = parse_method(cfs,
2868 is_interface,
2869 _cp,
2870 has_localvariable_table,
2871 CHECK);
2872
2873 if (method->is_final()) {
2874 *has_final_method = true;
2875 }
2876 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2877 // used for interface initialization, and default method inheritance analysis
2878 if (is_interface && !(*declares_nonstatic_concrete_methods)
2879 && !method->is_abstract() && !method->is_static()) {
2880 *declares_nonstatic_concrete_methods = true;
2881 }
2882 _methods->at_put(index, method);
2883 }
2884
2885 if (_need_verify && length > 1) {
2886 // Check duplicated methods
2887 ResourceMark rm(THREAD);
2888 // Set containing name-signature pairs
2889 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2890 for (int i = 0; i < length; i++) {
2891 const Method* const m = _methods->at(i);
2892 NameSigHash name_and_sig(m->name(), m->signature());
2893 // If no duplicates, add name/signature in hashtable names_and_sigs.
2894 if(!names_and_sigs->put(name_and_sig, 0)) {
2895 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2896 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2897 return;
2898 }
2899 }
2900 }
2901 }
2902 }
2903
2904 static const intArray* sort_methods(Array<Method*>* methods) {
2905 const int length = methods->length();
2906 // If JVMTI original method ordering or sharing is enabled we have to
2907 // remember the original class file ordering.
2908 // We temporarily use the vtable_index field in the Method* to store the
2909 // class file index, so we can read in after calling qsort.
2910 // Put the method ordering in the shared archive.
2911 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2912 for (int index = 0; index < length; index++) {
2913 Method* const m = methods->at(index);
2914 assert(!m->valid_vtable_index(), "vtable index should not be set");
2915 m->set_vtable_index(index);
2916 }
2917 }
2918 // Sort method array by ascending method name (for faster lookups & vtable construction)
2919 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2920 Method::sort_methods(methods);
2921
2922 intArray* method_ordering = nullptr;
2923 // If JVMTI original method ordering or sharing is enabled construct int
2924 // array remembering the original ordering
2925 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2926 method_ordering = new intArray(length, length, -1);
2927 for (int index = 0; index < length; index++) {
2928 Method* const m = methods->at(index);
2929 const int old_index = m->vtable_index();
2930 assert(old_index >= 0 && old_index < length, "invalid method index");
2931 method_ordering->at_put(index, old_index);
2932 m->set_vtable_index(Method::invalid_vtable_index);
2933 }
2934 }
2935 return method_ordering;
2936 }
2937
2938 // Parse generic_signature attribute for methods and fields
2939 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2940 TRAPS) {
2941 assert(cfs != nullptr, "invariant");
2942
2943 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2944 const u2 generic_signature_index = cfs->get_u2_fast();
2945 guarantee_property(
2946 valid_symbol_at(generic_signature_index),
2947 "Invalid Signature attribute at constant pool index %u in class file %s",
2948 generic_signature_index, CHECK_0);
2949 return generic_signature_index;
2950 }
2951
2952 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2953 TRAPS) {
2954
2955 assert(cfs != nullptr, "invariant");
2956
2957 cfs->guarantee_more(2, CHECK); // sourcefile_index
2958 const u2 sourcefile_index = cfs->get_u2_fast();
2959 guarantee_property(
2960 valid_symbol_at(sourcefile_index),
2961 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2962 sourcefile_index, CHECK);
2963 set_class_sourcefile_index(sourcefile_index);
2964 }
2965
2966 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2967 int length,
2968 TRAPS) {
2969 assert(cfs != nullptr, "invariant");
2970
2971 const u1* const sde_buffer = cfs->current();
2972 assert(sde_buffer != nullptr, "null sde buffer");
2973
2974 // Don't bother storing it if there is no way to retrieve it
2975 if (JvmtiExport::can_get_source_debug_extension()) {
2976 assert((length+1) > length, "Overflow checking");
2977 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2978 for (int i = 0; i < length; i++) {
2979 sde[i] = sde_buffer[i];
2980 }
2981 sde[length] = '\0';
2982 set_class_sde_buffer((const char*)sde, length);
2983 }
2984 // Got utf8 string, set stream position forward
2985 cfs->skip_u1(length, CHECK);
2986 }
2987
2988
2989 // Inner classes can be static, private or protected (classic VM does this)
2990 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2991 JVM_ACC_PRIVATE | \
2992 JVM_ACC_PROTECTED | \
2993 JVM_ACC_STATIC \
2994 )
2995
2996 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2997 // Return -1 if none is found.
2998 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2999 Symbol* cp_klass_name = cp->klass_name_at(inner);
3000 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3001 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3002 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3003 return idx;
3004 }
3005 }
3006 return -1;
3007 }
3008
3009 // Return the outer_class_info_index for the InnerClasses entry containing the
3010 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
3011 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3012 if (inner == 0) return -1;
3013 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3014 if (idx == -1) return -1;
3015 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3016 return result;
3017 }
3018
3019 // Return true if circularity is found, false if no circularity is found.
3020 // Use Floyd's cycle finding algorithm.
3021 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3022 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3023 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3024
3025 while (fast != -1 && fast != 0) {
3026 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3027 return true; // found a circularity
3028 }
3029 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3030 if (fast == -1) return false;
3031 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3032 if (fast == -1) return false;
3033 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3034 assert(slow != -1, "sanity check");
3035 }
3036 return false;
3037 }
3038
3039 // Loop through each InnerClasses entry checking for circularities and duplications
3040 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3041 // return true if a circularity or entries with duplicate inner_class_info_indexes
3042 // are found.
3043 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3044 // Loop through each InnerClasses entry.
3045 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3046 // Return true if there are circular entries.
3047 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3048 return true;
3049 }
3050 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3051 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3052 y += InstanceKlass::inner_class_next_offset) {
3053
3054 // 4347400: make sure there's no duplicate entry in the classes array
3055 if (_major_version >= JAVA_1_5_VERSION) {
3056 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3057 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3058 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3059 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3060 "Duplicate entry in InnerClasses attribute in class file %s",
3061 CHECK_(true));
3062 }
3063 // Return true if there are two entries with the same inner_class_info_index.
3064 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3065 return true;
3066 }
3067 }
3068 }
3069 return false;
3070 }
3071
3072 // Return number of classes in the inner classes attribute table
3073 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3074 const ConstantPool* cp,
3075 const u1* const inner_classes_attribute_start,
3076 bool parsed_enclosingmethod_attribute,
3077 u2 enclosing_method_class_index,
3078 u2 enclosing_method_method_index,
3079 TRAPS) {
3080 const u1* const current_mark = cfs->current();
3081 u2 length = 0;
3082 if (inner_classes_attribute_start != nullptr) {
3083 cfs->set_current(inner_classes_attribute_start);
3084 cfs->guarantee_more(2, CHECK_0); // length
3085 length = cfs->get_u2_fast();
3086 }
3087
3088 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3089 // method data:
3090 // [inner_class_info_index,
3091 // outer_class_info_index,
3092 // inner_name_index,
3093 // inner_class_access_flags,
3094 // ...
3095 // enclosing_method_class_index,
3096 // enclosing_method_method_index]
3097 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3098 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3099 _inner_classes = inner_classes;
3100
3101 int index = 0;
3102 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3103 for (int n = 0; n < length; n++) {
3104 // Inner class index
3105 const u2 inner_class_info_index = cfs->get_u2_fast();
3106 guarantee_property(
3107 valid_klass_reference_at(inner_class_info_index),
3108 "inner_class_info_index %u has bad constant type in class file %s",
3109 inner_class_info_index, CHECK_0);
3110 // Outer class index
3111 const u2 outer_class_info_index = cfs->get_u2_fast();
3112 guarantee_property(
3113 outer_class_info_index == 0 ||
3114 valid_klass_reference_at(outer_class_info_index),
3115 "outer_class_info_index %u has bad constant type in class file %s",
3116 outer_class_info_index, CHECK_0);
3117
3118 if (outer_class_info_index != 0) {
3119 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3120 char* bytes = (char*)outer_class_name->bytes();
3121 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3122 "Outer class is an array class in class file %s", CHECK_0);
3123 }
3124 // Inner class name
3125 const u2 inner_name_index = cfs->get_u2_fast();
3126 guarantee_property(
3127 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3128 "inner_name_index %u has bad constant type in class file %s",
3129 inner_name_index, CHECK_0);
3130 if (_need_verify) {
3131 guarantee_property(inner_class_info_index != outer_class_info_index,
3132 "Class is both outer and inner class in class file %s", CHECK_0);
3133 }
3134
3135 // Access flags
3136 u2 flags;
3137 // JVM_ACC_MODULE is defined in JDK-9 and later.
3138 if (_major_version >= JAVA_9_VERSION) {
3139 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3140 } else {
3141 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3142 }
3143
3144 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3145 // Set abstract bit for old class files for backward compatibility
3146 flags |= JVM_ACC_ABSTRACT;
3147 }
3148
3149 if (!supports_inline_types()) {
3150 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3151 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3152 if (!is_module && !is_interface) {
3153 flags |= JVM_ACC_IDENTITY;
3154 }
3155 }
3156
3157 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3158 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3159 AccessFlags inner_access_flags(flags);
3160
3161 inner_classes->at_put(index++, inner_class_info_index);
3162 inner_classes->at_put(index++, outer_class_info_index);
3163 inner_classes->at_put(index++, inner_name_index);
3164 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3165 }
3166
3167 // Check for circular and duplicate entries.
3168 bool has_circularity = false;
3169 if (_need_verify) {
3170 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3171 if (has_circularity) {
3172 // If circularity check failed then ignore InnerClasses attribute.
3173 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3174 index = 0;
3175 if (parsed_enclosingmethod_attribute) {
3176 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3177 _inner_classes = inner_classes;
3178 } else {
3179 _inner_classes = Universe::the_empty_short_array();
3180 }
3181 }
3182 }
3183 // Set EnclosingMethod class and method indexes.
3184 if (parsed_enclosingmethod_attribute) {
3185 inner_classes->at_put(index++, enclosing_method_class_index);
3186 inner_classes->at_put(index++, enclosing_method_method_index);
3187 }
3188 assert(index == size || has_circularity, "wrong size");
3189
3190 // Restore buffer's current position.
3191 cfs->set_current(current_mark);
3192
3193 return length;
3194 }
3195
3196 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3197 const u1* const nest_members_attribute_start,
3198 TRAPS) {
3199 const u1* const current_mark = cfs->current();
3200 u2 length = 0;
3201 if (nest_members_attribute_start != nullptr) {
3202 cfs->set_current(nest_members_attribute_start);
3203 cfs->guarantee_more(2, CHECK_0); // length
3204 length = cfs->get_u2_fast();
3205 }
3206 const int size = length;
3207 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3208 _nest_members = nest_members;
3209
3210 int index = 0;
3211 cfs->guarantee_more(2 * length, CHECK_0);
3212 for (int n = 0; n < length; n++) {
3213 const u2 class_info_index = cfs->get_u2_fast();
3214 guarantee_property(
3215 valid_klass_reference_at(class_info_index),
3216 "Nest member class_info_index %u has bad constant type in class file %s",
3217 class_info_index, CHECK_0);
3218 nest_members->at_put(index++, class_info_index);
3219 }
3220 assert(index == size, "wrong size");
3221
3222 // Restore buffer's current position.
3223 cfs->set_current(current_mark);
3224
3225 return length;
3226 }
3227
3228 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3229 const u1* const permitted_subclasses_attribute_start,
3230 TRAPS) {
3231 const u1* const current_mark = cfs->current();
3232 u2 length = 0;
3233 if (permitted_subclasses_attribute_start != nullptr) {
3234 cfs->set_current(permitted_subclasses_attribute_start);
3235 cfs->guarantee_more(2, CHECK_0); // length
3236 length = cfs->get_u2_fast();
3237 }
3238 const int size = length;
3239 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3240 _permitted_subclasses = permitted_subclasses;
3241
3242 if (length > 0) {
3243 int index = 0;
3244 cfs->guarantee_more(2 * length, CHECK_0);
3245 for (int n = 0; n < length; n++) {
3246 const u2 class_info_index = cfs->get_u2_fast();
3247 guarantee_property(
3248 valid_klass_reference_at(class_info_index),
3249 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3250 class_info_index, CHECK_0);
3251 permitted_subclasses->at_put(index++, class_info_index);
3252 }
3253 assert(index == size, "wrong size");
3254 }
3255
3256 // Restore buffer's current position.
3257 cfs->set_current(current_mark);
3258
3259 return length;
3260 }
3261
3262 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3263 const u1* const loadable_descriptors_attribute_start,
3264 TRAPS) {
3265 const u1* const current_mark = cfs->current();
3266 u2 length = 0;
3267 if (loadable_descriptors_attribute_start != nullptr) {
3268 cfs->set_current(loadable_descriptors_attribute_start);
3269 cfs->guarantee_more(2, CHECK_0); // length
3270 length = cfs->get_u2_fast();
3271 }
3272 const int size = length;
3273 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3274 _loadable_descriptors = loadable_descriptors;
3275 if (length > 0) {
3276 int index = 0;
3277 cfs->guarantee_more(2 * length, CHECK_0);
3278 for (int n = 0; n < length; n++) {
3279 const u2 descriptor_index = cfs->get_u2_fast();
3280 guarantee_property(
3281 valid_symbol_at(descriptor_index),
3282 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3283 descriptor_index, CHECK_0);
3284 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3285 bool valid = legal_field_signature(descriptor, CHECK_0);
3286 if (!valid) {
3287 ResourceMark rm(THREAD);
3288 Exceptions::fthrow(THREAD_AND_LOCATION,
3289 vmSymbols::java_lang_ClassFormatError(),
3290 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3291 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3292 return 0;
3293 }
3294 loadable_descriptors->at_put(index++, descriptor_index);
3295 }
3296 assert(index == size, "wrong size");
3297 }
3298
3299 // Restore buffer's current position.
3300 cfs->set_current(current_mark);
3301
3302 return length;
3303 }
3304
3305 // Record {
3306 // u2 attribute_name_index;
3307 // u4 attribute_length;
3308 // u2 components_count;
3309 // component_info components[components_count];
3310 // }
3311 // component_info {
3312 // u2 name_index;
3313 // u2 descriptor_index
3314 // u2 attributes_count;
3315 // attribute_info_attributes[attributes_count];
3316 // }
3317 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3318 const ConstantPool* cp,
3319 const u1* const record_attribute_start,
3320 TRAPS) {
3321 const u1* const current_mark = cfs->current();
3322 int components_count = 0;
3323 unsigned int calculate_attr_size = 0;
3324 if (record_attribute_start != nullptr) {
3325 cfs->set_current(record_attribute_start);
3326 cfs->guarantee_more(2, CHECK_0); // num of components
3327 components_count = (int)cfs->get_u2_fast();
3328 calculate_attr_size = 2;
3329 }
3330
3331 Array<RecordComponent*>* const record_components =
3332 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3333 _record_components = record_components;
3334
3335 for (int x = 0; x < components_count; x++) {
3336 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3337
3338 const u2 name_index = cfs->get_u2_fast();
3339 guarantee_property(valid_symbol_at(name_index),
3340 "Invalid constant pool index %u for name in Record attribute in class file %s",
3341 name_index, CHECK_0);
3342 const Symbol* const name = cp->symbol_at(name_index);
3343 verify_legal_field_name(name, CHECK_0);
3344
3345 const u2 descriptor_index = cfs->get_u2_fast();
3346 guarantee_property(valid_symbol_at(descriptor_index),
3347 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3348 descriptor_index, CHECK_0);
3349 const Symbol* const descr = cp->symbol_at(descriptor_index);
3350 verify_legal_field_signature(name, descr, CHECK_0);
3351
3352 const u2 attributes_count = cfs->get_u2_fast();
3353 calculate_attr_size += 6;
3354 u2 generic_sig_index = 0;
3355 const u1* runtime_visible_annotations = nullptr;
3356 int runtime_visible_annotations_length = 0;
3357 bool runtime_invisible_annotations_exists = false;
3358 const u1* runtime_visible_type_annotations = nullptr;
3359 int runtime_visible_type_annotations_length = 0;
3360 bool runtime_invisible_type_annotations_exists = false;
3361
3362 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3363 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3364 for (int y = 0; y < attributes_count; y++) {
3365 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3366 const u2 attribute_name_index = cfs->get_u2_fast();
3367 const u4 attribute_length = cfs->get_u4_fast();
3368 calculate_attr_size += 6;
3369 guarantee_property(
3370 valid_symbol_at(attribute_name_index),
3371 "Invalid Record attribute name index %u in class file %s",
3372 attribute_name_index, CHECK_0);
3373
3374 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3375 if (attribute_name == vmSymbols::tag_signature()) {
3376 if (generic_sig_index != 0) {
3377 classfile_parse_error(
3378 "Multiple Signature attributes for Record component in class file %s",
3379 THREAD);
3380 return 0;
3381 }
3382 if (attribute_length != 2) {
3383 classfile_parse_error(
3384 "Invalid Signature attribute length %u in Record component in class file %s",
3385 attribute_length, THREAD);
3386 return 0;
3387 }
3388 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3389
3390 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3391 if (runtime_visible_annotations != nullptr) {
3392 classfile_parse_error(
3393 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3394 return 0;
3395 }
3396 runtime_visible_annotations_length = attribute_length;
3397 runtime_visible_annotations = cfs->current();
3398
3399 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3400 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3401 cfs->skip_u1_fast(runtime_visible_annotations_length);
3402
3403 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3404 if (runtime_invisible_annotations_exists) {
3405 classfile_parse_error(
3406 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3407 return 0;
3408 }
3409 runtime_invisible_annotations_exists = true;
3410 cfs->skip_u1(attribute_length, CHECK_0);
3411
3412 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3413 if (runtime_visible_type_annotations != nullptr) {
3414 classfile_parse_error(
3415 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3416 return 0;
3417 }
3418 runtime_visible_type_annotations_length = attribute_length;
3419 runtime_visible_type_annotations = cfs->current();
3420
3421 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3422 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3423 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3424
3425 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3426 if (runtime_invisible_type_annotations_exists) {
3427 classfile_parse_error(
3428 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3429 return 0;
3430 }
3431 runtime_invisible_type_annotations_exists = true;
3432 cfs->skip_u1(attribute_length, CHECK_0);
3433
3434 } else {
3435 // Skip unknown attributes
3436 cfs->skip_u1(attribute_length, CHECK_0);
3437 }
3438 calculate_attr_size += attribute_length;
3439 } // End of attributes For loop
3440
3441 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3442 runtime_visible_annotations_length,
3443 CHECK_0);
3444 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3445 runtime_visible_type_annotations_length,
3446 CHECK_0);
3447
3448 RecordComponent* record_component =
3449 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3450 annotations, type_annotations, CHECK_0);
3451 record_components->at_put(x, record_component);
3452 } // End of component processing loop
3453
3454 // Restore buffer's current position.
3455 cfs->set_current(current_mark);
3456 return calculate_attr_size;
3457 }
3458
3459 void ClassFileParser::parse_classfile_synthetic_attribute() {
3460 set_class_synthetic_flag(true);
3461 }
3462
3463 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3464 assert(cfs != nullptr, "invariant");
3465
3466 const u2 signature_index = cfs->get_u2(CHECK);
3467 guarantee_property(
3468 valid_symbol_at(signature_index),
3469 "Invalid constant pool index %u in Signature attribute in class file %s",
3470 signature_index, CHECK);
3471 set_class_generic_signature_index(signature_index);
3472 }
3473
3474 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3475 ConstantPool* cp,
3476 u4 attribute_byte_length,
3477 TRAPS) {
3478 assert(cfs != nullptr, "invariant");
3479 assert(cp != nullptr, "invariant");
3480 const int cp_size = cp->length();
3481
3482 const u1* const current_before_parsing = cfs->current();
3483
3484 guarantee_property(attribute_byte_length >= sizeof(u2),
3485 "Invalid BootstrapMethods attribute length %u in class file %s",
3486 attribute_byte_length,
3487 CHECK);
3488
3489 cfs->guarantee_more(attribute_byte_length, CHECK);
3490
3491 const int num_bootstrap_methods = cfs->get_u2_fast();
3492
3493 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods,
3494 "Short length on BootstrapMethods in class file %s",
3495 CHECK);
3496
3497 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3498
3499 // Eagerly assign the arrays so that they will be deallocated with the constant
3500 // pool if there is an error.
3501 BSMAttributeEntries::InsertionIterator iter =
3502 cp->bsm_entries().start_extension(num_bootstrap_methods,
3503 bootstrap_methods_u2_len,
3504 _loader_data,
3505 CHECK);
3506
3507 for (int i = 0; i < num_bootstrap_methods; i++) {
3508 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3509 u2 bootstrap_method_ref = cfs->get_u2_fast();
3510 u2 num_bootstrap_arguments = cfs->get_u2_fast();
3511 guarantee_property(
3512 valid_cp_range(bootstrap_method_ref, cp_size) &&
3513 cp->tag_at(bootstrap_method_ref).is_method_handle(),
3514 "bootstrap_method_index %u has bad constant type in class file %s",
3515 bootstrap_method_ref,
3516 CHECK);
3517 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc]
3518
3519 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments);
3520 guarantee_property(entry != nullptr,
3521 "Invalid BootstrapMethods num_bootstrap_methods."
3522 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK);
3523
3524 for (int argi = 0; argi < num_bootstrap_arguments; argi++) {
3525 const u2 argument_index = cfs->get_u2_fast();
3526 guarantee_property(
3527 valid_cp_range(argument_index, cp_size) &&
3528 cp->tag_at(argument_index).is_loadable_constant(),
3529 "argument_index %u has bad constant type in class file %s",
3530 argument_index,
3531 CHECK);
3532 entry->set_argument(argi, argument_index);
3533 }
3534 }
3535 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3536 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3537 "Bad length on BootstrapMethods in class file %s",
3538 CHECK);
3539 }
3540
3541 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3542 ConstantPool* cp,
3543 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3544 TRAPS) {
3545 assert(cfs != nullptr, "invariant");
3546 assert(cp != nullptr, "invariant");
3547 assert(parsed_annotations != nullptr, "invariant");
3548
3549 // Set inner classes attribute to default sentinel
3550 _inner_classes = Universe::the_empty_short_array();
3551 // Set nest members attribute to default sentinel
3552 _nest_members = Universe::the_empty_short_array();
3553 // Set _permitted_subclasses attribute to default sentinel
3554 _permitted_subclasses = Universe::the_empty_short_array();
3555 // Set _loadable_descriptors attribute to default sentinel
3556 _loadable_descriptors = Universe::the_empty_short_array();
3557 cfs->guarantee_more(2, CHECK); // attributes_count
3558 u2 attributes_count = cfs->get_u2_fast();
3559 bool parsed_sourcefile_attribute = false;
3560 bool parsed_innerclasses_attribute = false;
3561 bool parsed_nest_members_attribute = false;
3562 bool parsed_permitted_subclasses_attribute = false;
3563 bool parsed_loadable_descriptors_attribute = false;
3564 bool parsed_nest_host_attribute = false;
3565 bool parsed_record_attribute = false;
3566 bool parsed_enclosingmethod_attribute = false;
3567 bool parsed_bootstrap_methods_attribute = false;
3568 const u1* runtime_visible_annotations = nullptr;
3569 int runtime_visible_annotations_length = 0;
3570 const u1* runtime_visible_type_annotations = nullptr;
3571 int runtime_visible_type_annotations_length = 0;
3572 bool runtime_invisible_type_annotations_exists = false;
3573 bool runtime_invisible_annotations_exists = false;
3574 bool parsed_source_debug_ext_annotations_exist = false;
3575 const u1* inner_classes_attribute_start = nullptr;
3576 u4 inner_classes_attribute_length = 0;
3577 u2 enclosing_method_class_index = 0;
3578 u2 enclosing_method_method_index = 0;
3579 const u1* nest_members_attribute_start = nullptr;
3580 u4 nest_members_attribute_length = 0;
3581 const u1* record_attribute_start = nullptr;
3582 u4 record_attribute_length = 0;
3583 const u1* permitted_subclasses_attribute_start = nullptr;
3584 u4 permitted_subclasses_attribute_length = 0;
3585 const u1* loadable_descriptors_attribute_start = nullptr;
3586 u4 loadable_descriptors_attribute_length = 0;
3587
3588 // Iterate over attributes
3589 while (attributes_count--) {
3590 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3591 const u2 attribute_name_index = cfs->get_u2_fast();
3592 const u4 attribute_length = cfs->get_u4_fast();
3593 guarantee_property(
3594 valid_symbol_at(attribute_name_index),
3595 "Attribute name has bad constant pool index %u in class file %s",
3596 attribute_name_index, CHECK);
3597 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3598 if (tag == vmSymbols::tag_source_file()) {
3599 // Check for SourceFile tag
3600 if (_need_verify) {
3601 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3602 }
3603 if (parsed_sourcefile_attribute) {
3604 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3605 return;
3606 } else {
3607 parsed_sourcefile_attribute = true;
3608 }
3609 parse_classfile_sourcefile_attribute(cfs, CHECK);
3610 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3611 // Check for SourceDebugExtension tag
3612 if (parsed_source_debug_ext_annotations_exist) {
3613 classfile_parse_error(
3614 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3615 return;
3616 }
3617 parsed_source_debug_ext_annotations_exist = true;
3618 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3619 } else if (tag == vmSymbols::tag_inner_classes()) {
3620 // Check for InnerClasses tag
3621 if (parsed_innerclasses_attribute) {
3622 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3623 return;
3624 } else {
3625 parsed_innerclasses_attribute = true;
3626 }
3627 inner_classes_attribute_start = cfs->current();
3628 inner_classes_attribute_length = attribute_length;
3629 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3630 } else if (tag == vmSymbols::tag_synthetic()) {
3631 // Check for Synthetic tag
3632 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3633 if (attribute_length != 0) {
3634 classfile_parse_error(
3635 "Invalid Synthetic classfile attribute length %u in class file %s",
3636 attribute_length, THREAD);
3637 return;
3638 }
3639 parse_classfile_synthetic_attribute();
3640 } else if (tag == vmSymbols::tag_deprecated()) {
3641 // Check for Deprecated tag - 4276120
3642 if (attribute_length != 0) {
3643 classfile_parse_error(
3644 "Invalid Deprecated classfile attribute length %u in class file %s",
3645 attribute_length, THREAD);
3646 return;
3647 }
3648 } else if (_major_version >= JAVA_1_5_VERSION) {
3649 if (tag == vmSymbols::tag_signature()) {
3650 if (_generic_signature_index != 0) {
3651 classfile_parse_error(
3652 "Multiple Signature attributes in class file %s", THREAD);
3653 return;
3654 }
3655 if (attribute_length != 2) {
3656 classfile_parse_error(
3657 "Wrong Signature attribute length %u in class file %s",
3658 attribute_length, THREAD);
3659 return;
3660 }
3661 parse_classfile_signature_attribute(cfs, CHECK);
3662 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3663 if (runtime_visible_annotations != nullptr) {
3664 classfile_parse_error(
3665 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3666 return;
3667 }
3668 runtime_visible_annotations_length = attribute_length;
3669 runtime_visible_annotations = cfs->current();
3670 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3671 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3672 parse_annotations(cp,
3673 runtime_visible_annotations,
3674 runtime_visible_annotations_length,
3675 parsed_annotations,
3676 _loader_data,
3677 _can_access_vm_annotations);
3678 cfs->skip_u1_fast(runtime_visible_annotations_length);
3679 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3680 if (runtime_invisible_annotations_exists) {
3681 classfile_parse_error(
3682 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3683 return;
3684 }
3685 runtime_invisible_annotations_exists = true;
3686 cfs->skip_u1(attribute_length, CHECK);
3687 } else if (tag == vmSymbols::tag_enclosing_method()) {
3688 if (parsed_enclosingmethod_attribute) {
3689 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3690 return;
3691 } else {
3692 parsed_enclosingmethod_attribute = true;
3693 }
3694 guarantee_property(attribute_length == 4,
3695 "Wrong EnclosingMethod attribute length %u in class file %s",
3696 attribute_length, CHECK);
3697 cfs->guarantee_more(4, CHECK); // class_index, method_index
3698 enclosing_method_class_index = cfs->get_u2_fast();
3699 enclosing_method_method_index = cfs->get_u2_fast();
3700 if (enclosing_method_class_index == 0) {
3701 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3702 return;
3703 }
3704 // Validate the constant pool indices and types
3705 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3706 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3707 if (enclosing_method_method_index != 0 &&
3708 (!cp->is_within_bounds(enclosing_method_method_index) ||
3709 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3710 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3711 return;
3712 }
3713 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3714 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3715 if (parsed_bootstrap_methods_attribute) {
3716 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3717 return;
3718 }
3719 parsed_bootstrap_methods_attribute = true;
3720 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3721 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3722 if (runtime_visible_type_annotations != nullptr) {
3723 classfile_parse_error(
3724 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3725 return;
3726 }
3727 runtime_visible_type_annotations_length = attribute_length;
3728 runtime_visible_type_annotations = cfs->current();
3729 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3730 // No need for the VM to parse Type annotations
3731 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3732 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3733 if (runtime_invisible_type_annotations_exists) {
3734 classfile_parse_error(
3735 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3736 return;
3737 }
3738 runtime_invisible_type_annotations_exists = true;
3739 cfs->skip_u1(attribute_length, CHECK);
3740 } else if (_major_version >= JAVA_11_VERSION) {
3741 if (tag == vmSymbols::tag_nest_members()) {
3742 // Check for NestMembers tag
3743 if (parsed_nest_members_attribute) {
3744 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3745 return;
3746 } else {
3747 parsed_nest_members_attribute = true;
3748 }
3749 if (parsed_nest_host_attribute) {
3750 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3751 return;
3752 }
3753 nest_members_attribute_start = cfs->current();
3754 nest_members_attribute_length = attribute_length;
3755 cfs->skip_u1(nest_members_attribute_length, CHECK);
3756 } else if (tag == vmSymbols::tag_nest_host()) {
3757 if (parsed_nest_host_attribute) {
3758 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3759 return;
3760 } else {
3761 parsed_nest_host_attribute = true;
3762 }
3763 if (parsed_nest_members_attribute) {
3764 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3765 return;
3766 }
3767 if (_need_verify) {
3768 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3769 }
3770 cfs->guarantee_more(2, CHECK);
3771 u2 class_info_index = cfs->get_u2_fast();
3772 guarantee_property(
3773 valid_klass_reference_at(class_info_index),
3774 "Nest-host class_info_index %u has bad constant type in class file %s",
3775 class_info_index, CHECK);
3776 _nest_host = class_info_index;
3777
3778 } else if (_major_version >= JAVA_16_VERSION) {
3779 if (tag == vmSymbols::tag_record()) {
3780 if (parsed_record_attribute) {
3781 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3782 return;
3783 }
3784 parsed_record_attribute = true;
3785 record_attribute_start = cfs->current();
3786 record_attribute_length = attribute_length;
3787 } else if (_major_version >= JAVA_17_VERSION) {
3788 if (tag == vmSymbols::tag_permitted_subclasses()) {
3789 if (parsed_permitted_subclasses_attribute) {
3790 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3791 return;
3792 }
3793 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3794 if (_access_flags.is_final()) {
3795 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3796 return;
3797 }
3798 parsed_permitted_subclasses_attribute = true;
3799 permitted_subclasses_attribute_start = cfs->current();
3800 permitted_subclasses_attribute_length = attribute_length;
3801 }
3802 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3803 if (parsed_loadable_descriptors_attribute) {
3804 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3805 return;
3806 }
3807 parsed_loadable_descriptors_attribute = true;
3808 loadable_descriptors_attribute_start = cfs->current();
3809 loadable_descriptors_attribute_length = attribute_length;
3810 }
3811 }
3812 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3813 cfs->skip_u1(attribute_length, CHECK);
3814 } else {
3815 // Unknown attribute
3816 cfs->skip_u1(attribute_length, CHECK);
3817 }
3818 } else {
3819 // Unknown attribute
3820 cfs->skip_u1(attribute_length, CHECK);
3821 }
3822 } else {
3823 // Unknown attribute
3824 cfs->skip_u1(attribute_length, CHECK);
3825 }
3826 }
3827 _class_annotations = allocate_annotations(runtime_visible_annotations,
3828 runtime_visible_annotations_length,
3829 CHECK);
3830 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3831 runtime_visible_type_annotations_length,
3832 CHECK);
3833
3834 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3835 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3836 cfs,
3837 cp,
3838 inner_classes_attribute_start,
3839 parsed_innerclasses_attribute,
3840 enclosing_method_class_index,
3841 enclosing_method_method_index,
3842 CHECK);
3843 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3844 guarantee_property(
3845 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3846 "Wrong InnerClasses attribute length in class file %s", CHECK);
3847 }
3848 }
3849
3850 if (parsed_nest_members_attribute) {
3851 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3852 cfs,
3853 nest_members_attribute_start,
3854 CHECK);
3855 if (_need_verify) {
3856 guarantee_property(
3857 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3858 "Wrong NestMembers attribute length in class file %s", CHECK);
3859 }
3860 }
3861
3862 if (parsed_record_attribute) {
3863 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3864 cfs,
3865 cp,
3866 record_attribute_start,
3867 CHECK);
3868 if (_need_verify) {
3869 guarantee_property(record_attribute_length == calculated_attr_length,
3870 "Record attribute has wrong length in class file %s",
3871 CHECK);
3872 }
3873 }
3874
3875 if (parsed_permitted_subclasses_attribute) {
3876 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3877 cfs,
3878 permitted_subclasses_attribute_start,
3879 CHECK);
3880 if (_need_verify) {
3881 guarantee_property(
3882 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3883 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3884 }
3885 }
3886
3887 if (parsed_loadable_descriptors_attribute) {
3888 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3889 cfs,
3890 loadable_descriptors_attribute_start,
3891 CHECK);
3892 if (_need_verify) {
3893 guarantee_property(
3894 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3895 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3896 }
3897 }
3898
3899 if (_max_bootstrap_specifier_index >= 0) {
3900 guarantee_property(parsed_bootstrap_methods_attribute,
3901 "Missing BootstrapMethods attribute in class file %s", CHECK);
3902 }
3903 }
3904
3905 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3906 assert(k != nullptr, "invariant");
3907
3908 if (_synthetic_flag)
3909 k->set_is_synthetic();
3910 if (_sourcefile_index != 0) {
3911 k->set_source_file_name_index(_sourcefile_index);
3912 }
3913 if (_generic_signature_index != 0) {
3914 k->set_generic_signature_index(_generic_signature_index);
3915 }
3916 if (_sde_buffer != nullptr) {
3917 k->set_source_debug_extension(_sde_buffer, _sde_length);
3918 }
3919 }
3920
3921 // Create the Annotations object that will
3922 // hold the annotations array for the Klass.
3923 void ClassFileParser::create_combined_annotations(TRAPS) {
3924 if (_class_annotations == nullptr &&
3925 _class_type_annotations == nullptr &&
3926 _fields_annotations == nullptr &&
3927 _fields_type_annotations == nullptr) {
3928 // Don't create the Annotations object unnecessarily.
3929 return;
3930 }
3931
3932 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3933 annotations->set_class_annotations(_class_annotations);
3934 annotations->set_class_type_annotations(_class_type_annotations);
3935 annotations->set_fields_annotations(_fields_annotations);
3936 annotations->set_fields_type_annotations(_fields_type_annotations);
3937
3938 // This is the Annotations object that will be
3939 // assigned to InstanceKlass being constructed.
3940 _combined_annotations = annotations;
3941
3942 // The annotations arrays below has been transferred the
3943 // _combined_annotations so these fields can now be cleared.
3944 _class_annotations = nullptr;
3945 _class_type_annotations = nullptr;
3946 _fields_annotations = nullptr;
3947 _fields_type_annotations = nullptr;
3948 }
3949
3950 // Transfer ownership of metadata allocated to the InstanceKlass.
3951 void ClassFileParser::apply_parsed_class_metadata(
3952 InstanceKlass* this_klass,
3953 int java_fields_count) {
3954 assert(this_klass != nullptr, "invariant");
3955
3956 _cp->set_pool_holder(this_klass);
3957 this_klass->set_constants(_cp);
3958 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3959 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3960 this_klass->set_fields_status(_fields_status);
3961 this_klass->set_methods(_methods);
3962 this_klass->set_inner_classes(_inner_classes);
3963 this_klass->set_nest_members(_nest_members);
3964 this_klass->set_nest_host_index(_nest_host);
3965 this_klass->set_loadable_descriptors(_loadable_descriptors);
3966 this_klass->set_annotations(_combined_annotations);
3967 this_klass->set_permitted_subclasses(_permitted_subclasses);
3968 this_klass->set_record_components(_record_components);
3969 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3970
3971 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3972
3973 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3974 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3975 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3976 // its _super. If an OOM occurs while loading the current klass, its _super field
3977 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3978 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3979 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3980
3981 // Clear out these fields so they don't get deallocated by the destructor
3982 clear_class_metadata();
3983 }
3984
3985 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3986 int anno_length,
3987 TRAPS) {
3988 AnnotationArray* annotations = nullptr;
3989 if (anno != nullptr) {
3990 annotations = MetadataFactory::new_array<u1>(_loader_data,
3991 anno_length,
3992 CHECK_(annotations));
3993 for (int i = 0; i < anno_length; i++) {
3994 annotations->at_put(i, anno[i]);
3995 }
3996 }
3997 return annotations;
3998 }
3999
4000 void ClassFileParser::check_super_class(ConstantPool* const cp,
4001 const int super_class_index,
4002 const bool need_verify,
4003 TRAPS) {
4004 assert(cp != nullptr, "invariant");
4005
4006 if (super_class_index == 0) {
4007 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
4008 "Invalid superclass index 0 in class file %s",
4009 CHECK);
4010 } else {
4011 guarantee_property(valid_klass_reference_at(super_class_index),
4012 "Invalid superclass index %u in class file %s",
4013 super_class_index,
4014 CHECK);
4015
4016 // The class name should be legal because it is checked when parsing constant pool.
4017 // However, make sure it is not an array type.
4018 if (need_verify) {
4019 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4020 "Bad superclass name in class file %s", CHECK);
4021 }
4022 }
4023 }
4024
4025 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4026 _max_nonstatic_oop_maps = max_blocks;
4027 _nonstatic_oop_map_count = 0;
4028 if (max_blocks == 0) {
4029 _nonstatic_oop_maps = nullptr;
4030 } else {
4031 _nonstatic_oop_maps =
4032 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4033 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4034 }
4035 }
4036
4037 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4038 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4039 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4040 }
4041
4042 // addition of super oop maps
4043 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4044 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4045 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4046
4047 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4048 _nonstatic_oop_map_count += nof_blocks;
4049 }
4050
4051 // collection of oops
4052 void OopMapBlocksBuilder::add(int offset, int count) {
4053 if (_nonstatic_oop_map_count == 0) {
4054 _nonstatic_oop_map_count++;
4055 }
4056 OopMapBlock* nonstatic_oop_map = last_oop_map();
4057 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4058 nonstatic_oop_map->set_offset(offset);
4059 nonstatic_oop_map->set_count(count);
4060 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4061 nonstatic_oop_map->increment_count(count);
4062 } else { // Need a new one...
4063 _nonstatic_oop_map_count++;
4064 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4065 nonstatic_oop_map = last_oop_map();
4066 nonstatic_oop_map->set_offset(offset);
4067 nonstatic_oop_map->set_count(count);
4068 }
4069 }
4070
4071 // general purpose copy, e.g. into allocated instanceKlass
4072 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4073 if (_nonstatic_oop_map_count != 0) {
4074 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4075 }
4076 }
4077
4078 // Sort and compact adjacent blocks
4079 void OopMapBlocksBuilder::compact() {
4080 if (_nonstatic_oop_map_count <= 1) {
4081 return;
4082 }
4083 /*
4084 * Since field layout sneaks in oops before values, we will be able to condense
4085 * blocks. There is potential to compact between super, own refs and values
4086 * containing refs.
4087 *
4088 * Currently compaction is slightly limited due to values being 8 byte aligned.
4089 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4090 * and maybe it doesn't need to be.
4091 */
4092 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4093 (_sort_Fn)OopMapBlock::compare_offset);
4094 if (_nonstatic_oop_map_count < 2) {
4095 return;
4096 }
4097
4098 // Make a temp copy, and iterate through and copy back into the original
4099 ResourceMark rm;
4100 OopMapBlock* oop_maps_copy =
4101 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4102 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4103 copy(oop_maps_copy);
4104 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4105 unsigned int new_count = 1;
4106 oop_maps_copy++;
4107 while(oop_maps_copy < oop_maps_copy_end) {
4108 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4109 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4110 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4111 } else {
4112 nonstatic_oop_map++;
4113 new_count++;
4114 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4115 nonstatic_oop_map->set_count(oop_maps_copy->count());
4116 }
4117 oop_maps_copy++;
4118 }
4119 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4120 _nonstatic_oop_map_count = new_count;
4121 }
4122
4123 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4124 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4125 if (_nonstatic_oop_map_count > 0) {
4126 OopMapBlock* map = _nonstatic_oop_maps;
4127 OopMapBlock* last_map = last_oop_map();
4128 assert(map <= last_map, "Last less than first");
4129 while (map <= last_map) {
4130 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4131 map->offset() + map->offset_span() - heapOopSize, map->count());
4132 map++;
4133 }
4134 }
4135 }
4136
4137 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4138 print_on(st);
4139 }
4140
4141 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4142 assert(ik != nullptr, "invariant");
4143
4144 const InstanceKlass* const super = ik->super();
4145
4146 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4147 // in which case we don't have to register objects as finalizable
4148 if (!_has_empty_finalizer) {
4149 if (_has_finalizer ||
4150 (super != nullptr && super->has_finalizer())) {
4151 ik->set_has_finalizer();
4152 }
4153 }
4154
4155 #ifdef ASSERT
4156 bool f = false;
4157 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4158 vmSymbols::void_method_signature());
4159 if (InstanceKlass::is_finalization_enabled() &&
4160 (m != nullptr) && !m->is_empty_method()) {
4161 f = true;
4162 }
4163
4164 // Spec doesn't prevent agent from redefinition of empty finalizer.
4165 // Despite the fact that it's generally bad idea and redefined finalizer
4166 // will not work as expected we shouldn't abort vm in this case
4167 if (!ik->has_redefined_this_or_super()) {
4168 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4169 }
4170 #endif
4171
4172 // Check if this klass supports the java.lang.Cloneable interface
4173 if (vmClasses::Cloneable_klass_is_loaded()) {
4174 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4175 ik->set_is_cloneable();
4176 }
4177 }
4178
4179 // If it cannot be fast-path allocated, set a bit in the layout helper.
4180 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4181 assert(ik->size_helper() > 0, "layout_helper is initialized");
4182 if (ik->is_abstract() || ik->is_interface()
4183 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4184 || ik->size_helper() >= FastAllocateSizeLimit) {
4185 // Forbid fast-path allocation.
4186 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4187 ik->set_layout_helper(lh);
4188 }
4189
4190 // Propagate the AOT runtimeSetup method discovery
4191 if (_has_aot_runtime_setup_method) {
4192 ik->set_is_runtime_setup_required();
4193 if (log_is_enabled(Info, aot, init)) {
4194 ResourceMark rm;
4195 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4196 }
4197 }
4198 }
4199
4200 bool ClassFileParser::supports_inline_types() const {
4201 // Inline types are only supported by class file version 71.65535 and later
4202 return _major_version > JAVA_28_VERSION ||
4203 (_major_version == JAVA_28_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4204 }
4205
4206 // utility methods for appending an array with check for duplicates
4207
4208 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4209 const Array<InstanceKlass*>* const ifs) {
4210 // iterate over new interfaces
4211 for (int i = 0; i < ifs->length(); i++) {
4212 InstanceKlass* const e = ifs->at(i);
4213 assert(e->is_klass() && e->is_interface(), "just checking");
4214 // add new interface
4215 result->append_if_missing(e);
4216 }
4217 }
4218
4219 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4220 Array<InstanceKlass*>* local_ifs,
4221 ClassLoaderData* loader_data,
4222 TRAPS) {
4223 assert(local_ifs != nullptr, "invariant");
4224 assert(loader_data != nullptr, "invariant");
4225
4226 // Compute maximum size for transitive interfaces
4227 int max_transitive_size = 0;
4228 int super_size = 0;
4229 // Add superclass transitive interfaces size
4230 if (super != nullptr) {
4231 super_size = super->transitive_interfaces()->length();
4232 max_transitive_size += super_size;
4233 }
4234 // Add local interfaces' super interfaces
4235 const int local_size = local_ifs->length();
4236 for (int i = 0; i < local_size; i++) {
4237 InstanceKlass* const l = local_ifs->at(i);
4238 max_transitive_size += l->transitive_interfaces()->length();
4239 }
4240 // Finally add local interfaces
4241 max_transitive_size += local_size;
4242 // Construct array
4243 if (max_transitive_size == 0) {
4244 // no interfaces, use canonicalized array
4245 return Universe::the_empty_instance_klass_array();
4246 } else if (max_transitive_size == super_size) {
4247 // no new local interfaces added, share superklass' transitive interface array
4248 return super->transitive_interfaces();
4249 } else if (max_transitive_size == local_size) {
4250 // only local interfaces added, share local interface array
4251 return local_ifs;
4252 } else {
4253 ResourceMark rm;
4254 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4255
4256 // Copy down from superclass
4257 if (super != nullptr) {
4258 append_interfaces(result, super->transitive_interfaces());
4259 }
4260
4261 // Copy down from local interfaces' superinterfaces
4262 for (int i = 0; i < local_size; i++) {
4263 InstanceKlass* const l = local_ifs->at(i);
4264 append_interfaces(result, l->transitive_interfaces());
4265 }
4266 // Finally add local interfaces
4267 append_interfaces(result, local_ifs);
4268
4269 // length will be less than the max_transitive_size if duplicates were removed
4270 const int length = result->length();
4271 assert(length <= max_transitive_size, "just checking");
4272 Array<InstanceKlass*>* const new_result =
4273 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4274 for (int i = 0; i < length; i++) {
4275 InstanceKlass* const e = result->at(i);
4276 assert(e != nullptr, "just checking");
4277 new_result->at_put(i, e);
4278 }
4279 return new_result;
4280 }
4281 }
4282
4283 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4284 assert(this_klass != nullptr, "invariant");
4285 const InstanceKlass* const super = this_klass->super();
4286
4287 if (super != nullptr) {
4288 if (super->is_final()) {
4289 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4290 return;
4291 }
4292
4293 if (super->is_sealed()) {
4294 stringStream ss;
4295 ResourceMark rm(THREAD);
4296 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4297 classfile_icce_error(ss.as_string(), THREAD);
4298 return;
4299 }
4300 }
4301
4302 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4303 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4304 // for value classes. So, it is treated as a special case for now.
4305 if (!this_klass->access_flags().is_identity_class() &&
4306 super->name() != vmSymbols::java_lang_Object() &&
4307 super->is_identity_class()) {
4308 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4309 return;
4310 }
4311
4312 Reflection::VerifyClassAccessResults vca_result =
4313 Reflection::verify_class_access(this_klass, super, false);
4314 if (vca_result != Reflection::ACCESS_OK) {
4315 ResourceMark rm(THREAD);
4316 char* msg = Reflection::verify_class_access_msg(this_klass,
4317 super,
4318 vca_result);
4319
4320 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4321 if (msg == nullptr) {
4322 bool same_module = (this_klass->module() == super->module());
4323 Exceptions::fthrow(
4324 THREAD_AND_LOCATION,
4325 vmSymbols::java_lang_IllegalAccessError(),
4326 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4327 this_klass->external_name(),
4328 super->is_abstract() ? "abstract " : "",
4329 super->external_name(),
4330 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4331 (same_module) ? "" : "; ",
4332 (same_module) ? "" : super->class_in_module_of_loader());
4333 } else {
4334 // Add additional message content.
4335 Exceptions::fthrow(
4336 THREAD_AND_LOCATION,
4337 vmSymbols::java_lang_IllegalAccessError(),
4338 "superclass access check failed: %s",
4339 msg);
4340 }
4341 }
4342 }
4343 }
4344
4345
4346 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4347 assert(this_klass != nullptr, "invariant");
4348 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4349 const int lng = local_interfaces->length();
4350 for (int i = lng - 1; i >= 0; i--) {
4351 InstanceKlass* const k = local_interfaces->at(i);
4352 assert (k != nullptr && k->is_interface(), "invalid interface");
4353
4354 if (k->is_sealed()) {
4355 stringStream ss;
4356 ResourceMark rm(THREAD);
4357 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4358 classfile_icce_error(ss.as_string(), THREAD);
4359 return;
4360 }
4361 }
4362
4363 Reflection::VerifyClassAccessResults vca_result =
4364 Reflection::verify_class_access(this_klass, k, false);
4365 if (vca_result != Reflection::ACCESS_OK) {
4366 ResourceMark rm(THREAD);
4367 char* msg = Reflection::verify_class_access_msg(this_klass,
4368 k,
4369 vca_result);
4370
4371 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4372 if (msg == nullptr) {
4373 bool same_module = (this_klass->module() == k->module());
4374 Exceptions::fthrow(
4375 THREAD_AND_LOCATION,
4376 vmSymbols::java_lang_IllegalAccessError(),
4377 "class %s cannot access its superinterface %s (%s%s%s)",
4378 this_klass->external_name(),
4379 k->external_name(),
4380 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4381 (same_module) ? "" : "; ",
4382 (same_module) ? "" : k->class_in_module_of_loader());
4383 return;
4384 } else {
4385 // Add additional message content.
4386 Exceptions::fthrow(
4387 THREAD_AND_LOCATION,
4388 vmSymbols::java_lang_IllegalAccessError(),
4389 "superinterface check failed: %s",
4390 msg);
4391 return;
4392 }
4393 }
4394 }
4395 }
4396
4397
4398 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4399 assert(this_klass != nullptr, "invariant");
4400 const Array<Method*>* const methods = this_klass->methods();
4401 const int num_methods = methods->length();
4402
4403 // go thru each method and check if it overrides a final method
4404 for (int index = 0; index < num_methods; index++) {
4405 const Method* const m = methods->at(index);
4406
4407 // skip private, static, and <init> methods
4408 if ((!m->is_private() && !m->is_static()) &&
4409 (m->name() != vmSymbols::object_initializer_name())) {
4410
4411 const Symbol* const name = m->name();
4412 const Symbol* const signature = m->signature();
4413 const InstanceKlass* k = this_klass->super();
4414 const Method* super_m = nullptr;
4415 while (k != nullptr) {
4416 // skip supers that don't have final methods.
4417 if (k->has_final_method()) {
4418 // lookup a matching method in the super class hierarchy
4419 super_m = k->lookup_method(name, signature);
4420 if (super_m == nullptr) {
4421 break; // didn't find any match; get out
4422 }
4423
4424 if (super_m->is_final() && !super_m->is_static() &&
4425 !super_m->access_flags().is_private()) {
4426 // matching method in super is final, and not static or private
4427 bool can_access = Reflection::verify_member_access(this_klass,
4428 super_m->method_holder(),
4429 super_m->method_holder(),
4430 super_m->access_flags(),
4431 false, false, CHECK);
4432 if (can_access) {
4433 // this class can access super final method and therefore override
4434 ResourceMark rm(THREAD);
4435 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4436 err_msg("class %s overrides final method %s.%s%s",
4437 this_klass->external_name(),
4438 super_m->method_holder()->external_name(),
4439 name->as_C_string(),
4440 signature->as_C_string()));
4441 }
4442 }
4443
4444 // continue to look from super_m's holder's super.
4445 k = super_m->method_holder()->super();
4446 continue;
4447 }
4448
4449 k = k->super();
4450 }
4451 }
4452 }
4453 }
4454
4455
4456 // assumes that this_klass is an interface
4457 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4458 assert(this_klass != nullptr, "invariant");
4459 assert(this_klass->is_interface(), "not an interface");
4460 const Array<Method*>* methods = this_klass->methods();
4461 const int num_methods = methods->length();
4462
4463 for (int index = 0; index < num_methods; index++) {
4464 const Method* const m = methods->at(index);
4465 // if m is static and not the init method, throw a verify error
4466 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4467 ResourceMark rm(THREAD);
4468
4469 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4470 Exceptions::fthrow(
4471 THREAD_AND_LOCATION,
4472 vmSymbols::java_lang_VerifyError(),
4473 "Illegal static method %s in interface %s",
4474 m->name()->as_C_string(),
4475 this_klass->external_name()
4476 );
4477 return;
4478 }
4479 }
4480 }
4481
4482 // utility methods for format checking
4483
4484 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4485 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4486 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4487 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4488 if (is_module) {
4489 ResourceMark rm(THREAD);
4490 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4491 Exceptions::fthrow(
4492 THREAD_AND_LOCATION,
4493 vmSymbols::java_lang_NoClassDefFoundError(),
4494 "%s is not a class because access_flag ACC_MODULE is set",
4495 _class_name->as_C_string());
4496 return;
4497 }
4498
4499 if (!_need_verify) { return; }
4500
4501 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4502 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4503 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4504 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4505 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4506 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4507 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4508 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final));
4509
4510 if ((is_abstract && is_final) ||
4511 (is_interface && !is_abstract) ||
4512 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4513 (!is_interface && major_gte_1_5 && is_annotation) ||
4514 (!valid_value_class)) {
4515 ResourceMark rm(THREAD);
4516 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4517 if (inner_name == nullptr && !is_anonymous_inner_class) {
4518 Exceptions::fthrow(
4519 THREAD_AND_LOCATION,
4520 vmSymbols::java_lang_ClassFormatError(),
4521 "Illegal class modifiers in class %s: 0x%X",
4522 _class_name->as_C_string(), flags
4523 );
4524 } else {
4525 if (is_anonymous_inner_class) {
4526 Exceptions::fthrow(
4527 THREAD_AND_LOCATION,
4528 vmSymbols::java_lang_ClassFormatError(),
4529 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4530 _class_name->as_C_string(), flags
4531 );
4532 } else {
4533 Exceptions::fthrow(
4534 THREAD_AND_LOCATION,
4535 vmSymbols::java_lang_ClassFormatError(),
4536 "Illegal class modifiers in inner class %s of class %s: 0x%X",
4537 inner_name->as_C_string(), _class_name->as_C_string(), flags
4538 );
4539 }
4540 }
4541 return;
4542 }
4543 }
4544
4545 static bool has_illegal_visibility(jint flags) {
4546 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4547 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4548 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4549
4550 return ((is_public && is_protected) ||
4551 (is_public && is_private) ||
4552 (is_protected && is_private));
4553 }
4554
4555 // A legal major_version.minor_version must be one of the following:
4556 //
4557 // Major_version >= 45 and major_version < 56, any minor_version.
4558 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4559 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4560 //
4561 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4562 ResourceMark rm(THREAD);
4563 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4564 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4565 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4566 class_name, major, minor, THREAD);
4567 return;
4568 }
4569
4570 if (major > max_version) {
4571 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4572 Exceptions::fthrow(
4573 THREAD_AND_LOCATION,
4574 vmSymbols::java_lang_UnsupportedClassVersionError(),
4575 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4576 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4577 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4578 return;
4579 }
4580
4581 if (major < JAVA_12_VERSION || minor == 0) {
4582 return;
4583 }
4584
4585 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4586 if (major != max_version) {
4587 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4588 Exceptions::fthrow(
4589 THREAD_AND_LOCATION,
4590 vmSymbols::java_lang_UnsupportedClassVersionError(),
4591 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4592 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4593 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4594 return;
4595 }
4596
4597 if (!Arguments::enable_preview()) {
4598 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4599 class_name, major, minor, THREAD);
4600 return;
4601 }
4602
4603 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4604 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4605 class_name, major, minor, THREAD);
4606 }
4607 }
4608
4609 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4610 AccessFlags class_access_flags,
4611 TRAPS) const {
4612 if (!_need_verify) { return; }
4613
4614 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4615 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4616 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4617 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4618 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4619 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4620 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4621 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4622 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4623 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4624
4625 const bool is_interface = class_access_flags.is_interface();
4626 const bool is_identity_class = class_access_flags.is_identity_class();
4627
4628 bool is_illegal = false;
4629 const char* error_msg = "";
4630
4631 // There is some overlap in the checks that apply, for example interface fields
4632 // must be static, static fields can't be strict, and therefore interfaces can't
4633 // have strict fields. So we don't have to check every possible invalid combination
4634 // individually as long as all are covered. Once we have found an illegal combination
4635 // we can stop checking.
4636
4637 if (!is_illegal) {
4638 if (is_interface) {
4639 if (!is_public || !is_static || !is_final || is_private ||
4640 is_protected || is_volatile || is_transient ||
4641 (major_gte_1_5 && is_enum)) {
4642 is_illegal = true;
4643 error_msg = "interface fields must be public, static and final, and may be synthetic";
4644 }
4645 } else { // not interface
4646 if (has_illegal_visibility(flags)) {
4647 is_illegal = true;
4648 error_msg = "invalid visibility flags for class field";
4649 } else if (is_final && is_volatile) {
4650 is_illegal = true;
4651 error_msg = "fields cannot be final and volatile";
4652 } else if (supports_inline_types()) {
4653 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4654 is_illegal = true;
4655 error_msg = "value class fields must be either non-static final and strict, or static";
4656 }
4657 }
4658 }
4659 }
4660
4661 if (is_illegal) {
4662 ResourceMark rm(THREAD);
4663 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4664 Exceptions::fthrow(
4665 THREAD_AND_LOCATION,
4666 vmSymbols::java_lang_ClassFormatError(),
4667 "Illegal field modifiers (%s) in class %s: 0x%X",
4668 error_msg, _class_name->as_C_string(), flags);
4669 return;
4670 }
4671 }
4672
4673 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4674 AccessFlags class_access_flags,
4675 const Symbol* name,
4676 TRAPS) const {
4677 if (!_need_verify) { return; }
4678
4679 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4680 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4681 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4682 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4683 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4684 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4685 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4686 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4687 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4688 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4689 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4690 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4691 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4692 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4693 const bool is_interface = class_access_flags.is_interface();
4694 const bool is_identity_class = class_access_flags.is_identity_class();
4695
4696 bool is_illegal = false;
4697 const char* class_note = "";
4698
4699 if (is_interface) {
4700 if (major_gte_8) {
4701 // Class file version is JAVA_8_VERSION or later Methods of
4702 // interfaces may set any of the flags except ACC_PROTECTED,
4703 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4704 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4705 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4706 (is_native || is_protected || is_final || is_synchronized) ||
4707 // If a specific method of a class or interface has its
4708 // ACC_ABSTRACT flag set, it must not have any of its
4709 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4710 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4711 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4712 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4713 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4714 is_illegal = true;
4715 }
4716 } else if (major_gte_1_5) {
4717 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4718 if (!is_public || is_private || is_protected || is_static || is_final ||
4719 is_synchronized || is_native || !is_abstract || is_strict) {
4720 is_illegal = true;
4721 }
4722 } else {
4723 // Class file version is pre-JAVA_1_5_VERSION
4724 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4725 is_illegal = true;
4726 }
4727 }
4728 } else { // not interface
4729 if (has_illegal_visibility(flags)) {
4730 is_illegal = true;
4731 } else {
4732 if (is_initializer) {
4733 if (is_static || is_final || is_synchronized || is_native ||
4734 is_abstract || (major_gte_1_5 && is_bridge)) {
4735 is_illegal = true;
4736 }
4737 } else { // not initializer
4738 if (!is_identity_class && is_synchronized && !is_static) {
4739 is_illegal = true;
4740 class_note = " (not an identity class)";
4741 } else {
4742 if (is_abstract) {
4743 if ((is_final || is_native || is_private || is_static ||
4744 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4745 is_illegal = true;
4746 }
4747 }
4748 }
4749 }
4750 }
4751 }
4752
4753 if (is_illegal) {
4754 ResourceMark rm(THREAD);
4755 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4756 Exceptions::fthrow(
4757 THREAD_AND_LOCATION,
4758 vmSymbols::java_lang_ClassFormatError(),
4759 "Method %s in class %s%s has illegal modifiers: 0x%X",
4760 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
4761 return;
4762 }
4763 }
4764
4765 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4766 int length,
4767 TRAPS) const {
4768 assert(_need_verify, "only called when _need_verify is true");
4769 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4770 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4771 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4772 }
4773 }
4774
4775 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4776 // In class names, '/' separates unqualified names. This is verified in this function also.
4777 // Method names also may not contain the characters '<' or '>', unless <init>
4778 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4779 // method. Because these names have been checked as special cases before
4780 // calling this method in verify_legal_method_name.
4781 //
4782 // This method is also called from the modular system APIs in modules.cpp
4783 // to verify the validity of module and package names.
4784 bool ClassFileParser::verify_unqualified_name(const char* name,
4785 unsigned int length,
4786 int type) {
4787 if (length == 0) return false; // Must have at least one char.
4788 for (const char* p = name; p != name + length; p++) {
4789 switch(*p) {
4790 case JVM_SIGNATURE_DOT:
4791 case JVM_SIGNATURE_ENDCLASS:
4792 case JVM_SIGNATURE_ARRAY:
4793 // do not permit '.', ';', or '['
4794 return false;
4795 case JVM_SIGNATURE_SLASH:
4796 // check for '//' or leading or trailing '/' which are not legal
4797 // unqualified name must not be empty
4798 if (type == ClassFileParser::LegalClass) {
4799 if (p == name || p+1 >= name+length ||
4800 *(p+1) == JVM_SIGNATURE_SLASH) {
4801 return false;
4802 }
4803 } else {
4804 return false; // do not permit '/' unless it's class name
4805 }
4806 break;
4807 case JVM_SIGNATURE_SPECIAL:
4808 case JVM_SIGNATURE_ENDSPECIAL:
4809 // do not permit '<' or '>' in method names
4810 if (type == ClassFileParser::LegalMethod) {
4811 return false;
4812 }
4813 }
4814 }
4815 return true;
4816 }
4817
4818 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4819 if (_loadable_descriptors == nullptr) return false;
4820 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4821 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4822 if (class_name == klass) return true;
4823 }
4824 return false;
4825 }
4826
4827 // Take pointer to a UTF8 byte string (not NUL-terminated).
4828 // Skip over the longest part of the string that could
4829 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4830 // Return a pointer to just past the fieldname.
4831 // Return null if no fieldname at all was found, or in the case of slash_ok
4832 // being true, we saw consecutive slashes (meaning we were looking for a
4833 // qualified path but found something that was badly-formed).
4834 static const char* skip_over_field_name(const char* const name,
4835 bool slash_ok,
4836 unsigned int length) {
4837 const char* p;
4838 jboolean last_is_slash = false;
4839 jboolean not_first_ch = false;
4840
4841 for (p = name; p != name + length; not_first_ch = true) {
4842 const char* old_p = p;
4843 jchar ch = *p;
4844 if (ch < 128) {
4845 p++;
4846 // quick check for ascii
4847 if ((ch >= 'a' && ch <= 'z') ||
4848 (ch >= 'A' && ch <= 'Z') ||
4849 (ch == '_' || ch == '$') ||
4850 (not_first_ch && ch >= '0' && ch <= '9')) {
4851 last_is_slash = false;
4852 continue;
4853 }
4854 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4855 if (last_is_slash) {
4856 return nullptr; // Don't permit consecutive slashes
4857 }
4858 last_is_slash = true;
4859 continue;
4860 }
4861 }
4862 else {
4863 jint unicode_ch;
4864 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4865 p = tmp_p;
4866 last_is_slash = false;
4867 // Check if ch is Java identifier start or is Java identifier part
4868 // 4672820: call java.lang.Character methods directly without generating separate tables.
4869 EXCEPTION_MARK;
4870 // return value
4871 JavaValue result(T_BOOLEAN);
4872 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4873 JavaCallArguments args;
4874 args.push_int(unicode_ch);
4875
4876 if (not_first_ch) {
4877 // public static boolean isJavaIdentifierPart(char ch);
4878 JavaCalls::call_static(&result,
4879 vmClasses::Character_klass(),
4880 vmSymbols::isJavaIdentifierPart_name(),
4881 vmSymbols::int_bool_signature(),
4882 &args,
4883 THREAD);
4884 } else {
4885 // public static boolean isJavaIdentifierStart(char ch);
4886 JavaCalls::call_static(&result,
4887 vmClasses::Character_klass(),
4888 vmSymbols::isJavaIdentifierStart_name(),
4889 vmSymbols::int_bool_signature(),
4890 &args,
4891 THREAD);
4892 }
4893 if (HAS_PENDING_EXCEPTION) {
4894 CLEAR_PENDING_EXCEPTION;
4895 return nullptr;
4896 }
4897 if(result.get_jboolean()) {
4898 continue;
4899 }
4900 }
4901 return (not_first_ch) ? old_p : nullptr;
4902 }
4903 return (not_first_ch && !last_is_slash) ? p : nullptr;
4904 }
4905
4906 // Take pointer to a UTF8 byte string (not NUL-terminated).
4907 // Skip over the longest part of the string that could
4908 // be taken as a field signature. Allow "void" if void_ok.
4909 // Return a pointer to just past the signature.
4910 // Return null if no legal signature is found.
4911 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4912 bool void_ok,
4913 unsigned int length,
4914 TRAPS) const {
4915 unsigned int array_dim = 0;
4916 while (length > 0) {
4917 switch (signature[0]) {
4918 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4919 case JVM_SIGNATURE_BOOLEAN:
4920 case JVM_SIGNATURE_BYTE:
4921 case JVM_SIGNATURE_CHAR:
4922 case JVM_SIGNATURE_SHORT:
4923 case JVM_SIGNATURE_INT:
4924 case JVM_SIGNATURE_FLOAT:
4925 case JVM_SIGNATURE_LONG:
4926 case JVM_SIGNATURE_DOUBLE:
4927 return signature + 1;
4928 case JVM_SIGNATURE_CLASS: {
4929 if (_major_version < JAVA_1_5_VERSION) {
4930 signature++;
4931 length--;
4932 // Skip over the class name if one is there
4933 const char* const p = skip_over_field_name(signature, true, length);
4934 assert(p == nullptr || p > signature, "must parse one character at least");
4935 // The next character better be a semicolon
4936 if (p != nullptr && // Parse of field name succeeded.
4937 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4938 p[0] == JVM_SIGNATURE_ENDCLASS) {
4939 return p + 1;
4940 }
4941 }
4942 else {
4943 // Skip leading 'L' and ignore first appearance of ';'
4944 signature++;
4945 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4946 // Format check signature
4947 if (c != nullptr) {
4948 int newlen = pointer_delta_as_int(c, (char*) signature);
4949 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4950 if (!legal) {
4951 classfile_parse_error("Class name is empty or contains illegal character "
4952 "in descriptor in class file %s",
4953 THREAD);
4954 return nullptr;
4955 }
4956 return signature + newlen + 1;
4957 }
4958 }
4959 return nullptr;
4960 }
4961 case JVM_SIGNATURE_ARRAY:
4962 array_dim++;
4963 if (array_dim > 255) {
4964 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4965 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4966 return nullptr;
4967 }
4968 // The rest of what's there better be a legal signature
4969 signature++;
4970 length--;
4971 void_ok = false;
4972 break;
4973 default:
4974 return nullptr;
4975 }
4976 }
4977 return nullptr;
4978 }
4979
4980 // Checks if name is a legal class name.
4981 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4982 if (!_need_verify) { return; }
4983
4984 assert(name->refcount() > 0, "symbol must be kept alive");
4985 char* bytes = (char*)name->bytes();
4986 unsigned int length = name->utf8_length();
4987 bool legal = false;
4988
4989 if (length > 0) {
4990 const char* p;
4991 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4992 p = skip_over_field_signature(bytes, false, length, CHECK);
4993 legal = (p != nullptr) && ((p - bytes) == (int)length);
4994 } else if (_major_version < JAVA_1_5_VERSION) {
4995 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4996 p = skip_over_field_name(bytes, true, length);
4997 legal = (p != nullptr) && ((p - bytes) == (int)length);
4998 }
4999 } else {
5000 // 4900761: relax the constraints based on JSR202 spec
5001 // Class names may be drawn from the entire Unicode character set.
5002 // Identifiers between '/' must be unqualified names.
5003 // The utf8 string has been verified when parsing cpool entries.
5004 legal = verify_unqualified_name(bytes, length, LegalClass);
5005 }
5006 }
5007 if (!legal) {
5008 ResourceMark rm(THREAD);
5009 assert(_class_name != nullptr, "invariant");
5010 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5011 Exceptions::fthrow(
5012 THREAD_AND_LOCATION,
5013 vmSymbols::java_lang_ClassFormatError(),
5014 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5015 _class_name->as_C_string()
5016 );
5017 return;
5018 }
5019 }
5020
5021 // Checks if name is a legal field name.
5022 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5023 if (!_need_verify) { return; }
5024
5025 char* bytes = (char*)name->bytes();
5026 unsigned int length = name->utf8_length();
5027 bool legal = false;
5028
5029 if (length > 0) {
5030 if (_major_version < JAVA_1_5_VERSION) {
5031 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5032 const char* p = skip_over_field_name(bytes, false, length);
5033 legal = (p != nullptr) && ((p - bytes) == (int)length);
5034 }
5035 } else {
5036 // 4881221: relax the constraints based on JSR202 spec
5037 legal = verify_unqualified_name(bytes, length, LegalField);
5038 }
5039 }
5040
5041 if (!legal) {
5042 ResourceMark rm(THREAD);
5043 assert(_class_name != nullptr, "invariant");
5044 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5045 Exceptions::fthrow(
5046 THREAD_AND_LOCATION,
5047 vmSymbols::java_lang_ClassFormatError(),
5048 "Illegal field name \"%.*s\" in class %s", length, bytes,
5049 _class_name->as_C_string()
5050 );
5051 return;
5052 }
5053 }
5054
5055 // Checks if name is a legal method name.
5056 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5057 if (!_need_verify) { return; }
5058
5059 assert(name != nullptr, "method name is null");
5060 char* bytes = (char*)name->bytes();
5061 unsigned int length = name->utf8_length();
5062 bool legal = false;
5063
5064 if (length > 0) {
5065 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5066 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5067 legal = true;
5068 }
5069 } else if (_major_version < JAVA_1_5_VERSION) {
5070 const char* p;
5071 p = skip_over_field_name(bytes, false, length);
5072 legal = (p != nullptr) && ((p - bytes) == (int)length);
5073 } else {
5074 // 4881221: relax the constraints based on JSR202 spec
5075 legal = verify_unqualified_name(bytes, length, LegalMethod);
5076 }
5077 }
5078
5079 if (!legal) {
5080 ResourceMark rm(THREAD);
5081 assert(_class_name != nullptr, "invariant");
5082 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5083 Exceptions::fthrow(
5084 THREAD_AND_LOCATION,
5085 vmSymbols::java_lang_ClassFormatError(),
5086 "Illegal method name \"%.*s\" in class %s", length, bytes,
5087 _class_name->as_C_string()
5088 );
5089 return;
5090 }
5091 }
5092
5093 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5094 const char* const bytes = (const char*)signature->bytes();
5095 const unsigned int length = signature->utf8_length();
5096 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5097
5098 if (p == nullptr || (p - bytes) != (int)length) {
5099 return false;
5100 }
5101 return true;
5102 }
5103
5104 // Checks if signature is a legal field signature.
5105 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5106 const Symbol* signature,
5107 TRAPS) const {
5108 if (!_need_verify) { return; }
5109
5110 if (!legal_field_signature(signature, THREAD)) {
5111 CLEAR_PENDING_EXCEPTION; // throw this exception instead
5112 throwIllegalSignature("Field", name, signature, CHECK);
5113 }
5114 }
5115
5116 // Check that the signature is compatible with the method name. For example,
5117 // check that <init> has a void signature.
5118 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5119 const Symbol* signature,
5120 TRAPS) const {
5121 if (!_need_verify) {
5122 return;
5123 }
5124
5125 // Class initializers cannot have args for class format version >= 51.
5126 if (name == vmSymbols::class_initializer_name() &&
5127 signature != vmSymbols::void_method_signature() &&
5128 _major_version >= JAVA_7_VERSION) {
5129 throwIllegalSignature("Method", name, signature, THREAD);
5130 return;
5131 }
5132
5133 int sig_length = signature->utf8_length();
5134 if (name->utf8_length() > 0 &&
5135 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5136 sig_length > 0 &&
5137 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5138 throwIllegalSignature("Method", name, signature, THREAD);
5139 }
5140 }
5141
5142 // Checks if signature is a legal method signature.
5143 // Returns number of parameters
5144 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5145 const Symbol* signature,
5146 TRAPS) const {
5147 if (!_need_verify) {
5148 // make sure caller's args_size will be less than 0 even for non-static
5149 // method so it will be recomputed in compute_size_of_parameters().
5150 return -2;
5151 }
5152
5153 unsigned int args_size = 0;
5154 const char* p = (const char*)signature->bytes();
5155 unsigned int length = signature->utf8_length();
5156 const char* nextp;
5157
5158 // The first character must be a '('
5159 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5160 length--;
5161 // Skip over legal field signatures
5162 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5163 while ((length > 0) && (nextp != nullptr)) {
5164 args_size++;
5165 if (p[0] == 'J' || p[0] == 'D') {
5166 args_size++;
5167 }
5168 length -= pointer_delta_as_int(nextp, p);
5169 p = nextp;
5170 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5171 }
5172 // The first non-signature thing better be a ')'
5173 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5174 length--;
5175 // Now we better just have a return value
5176 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5177 if (nextp && ((int)length == (nextp - p))) {
5178 return args_size;
5179 }
5180 }
5181 }
5182 // Report error
5183 throwIllegalSignature("Method", name, signature, THREAD);
5184 return 0;
5185 }
5186
5187 int ClassFileParser::static_field_size() const {
5188 assert(_layout_info != nullptr, "invariant");
5189 return _layout_info->_static_field_size;
5190 }
5191
5192 int ClassFileParser::total_oop_map_count() const {
5193 assert(_layout_info != nullptr, "invariant");
5194 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5195 }
5196
5197 jint ClassFileParser::layout_size() const {
5198 assert(_layout_info != nullptr, "invariant");
5199 return _layout_info->_instance_size;
5200 }
5201
5202 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5203 const Array<Method*>* methods) {
5204 assert(ik != nullptr, "invariant");
5205 assert(methods != nullptr, "invariant");
5206
5207 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5208 // (We used to do this lazily, but now we query it in Rewriter,
5209 // which is eagerly done for every method, so we might as well do it now,
5210 // when everything is fresh in memory.)
5211 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5212
5213 if (klass_id != vmSymbolID::NO_SID) {
5214 for (int j = 0; j < methods->length(); ++j) {
5215 Method* method = methods->at(j);
5216 method->init_intrinsic_id(klass_id);
5217
5218 if (CheckIntrinsics) {
5219 // Check if an intrinsic is defined for method 'method',
5220 // but the method is not annotated with @IntrinsicCandidate.
5221 if (method->intrinsic_id() != vmIntrinsics::_none &&
5222 !method->intrinsic_candidate()) {
5223 tty->print("Compiler intrinsic is defined for method [%s], "
5224 "but the method is not annotated with @IntrinsicCandidate.%s",
5225 method->name_and_sig_as_C_string(),
5226 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5227 );
5228 tty->cr();
5229 DEBUG_ONLY(vm_exit(1));
5230 }
5231 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5232 // but there is no intrinsic available for it.
5233 if (method->intrinsic_candidate() &&
5234 method->intrinsic_id() == vmIntrinsics::_none) {
5235 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5236 "but no compiler intrinsic is defined for the method.%s",
5237 method->name_and_sig_as_C_string(),
5238 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5239 );
5240 tty->cr();
5241 DEBUG_ONLY(vm_exit(1));
5242 }
5243 }
5244 } // end for
5245
5246 #ifdef ASSERT
5247 if (CheckIntrinsics) {
5248 // Check for orphan methods in the current class. A method m
5249 // of a class C is orphan if an intrinsic is defined for method m,
5250 // but class C does not declare m.
5251 // The check is potentially expensive, therefore it is available
5252 // only in debug builds.
5253
5254 for (auto id : EnumRange<vmIntrinsicID>{}) {
5255 if (vmIntrinsics::_compiledLambdaForm == id) {
5256 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5257 // generated for the JVM from a LambdaForm and therefore no method
5258 // is defined for it.
5259 continue;
5260 }
5261 if (vmIntrinsics::_blackhole == id) {
5262 // The _blackhole intrinsic is a special marker. No explicit method
5263 // is defined for it.
5264 continue;
5265 }
5266
5267 if (vmIntrinsics::class_for(id) == klass_id) {
5268 // Check if the current class contains a method with the same
5269 // name, flags, signature.
5270 bool match = false;
5271 for (int j = 0; j < methods->length(); ++j) {
5272 const Method* method = methods->at(j);
5273 if (method->intrinsic_id() == id) {
5274 match = true;
5275 break;
5276 }
5277 }
5278
5279 if (!match) {
5280 char buf[1000];
5281 tty->print("Compiler intrinsic is defined for method [%s], "
5282 "but the method is not available in class [%s].%s",
5283 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5284 ik->name()->as_C_string(),
5285 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5286 );
5287 tty->cr();
5288 DEBUG_ONLY(vm_exit(1));
5289 }
5290 }
5291 } // end for
5292 } // CheckIntrinsics
5293 #endif // ASSERT
5294 }
5295 }
5296
5297 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5298 const ClassInstanceInfo& cl_inst_info,
5299 TRAPS) {
5300 if (_klass != nullptr) {
5301 return _klass;
5302 }
5303
5304 InstanceKlass* const ik =
5305 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5306
5307 if (is_hidden()) {
5308 mangle_hidden_class_name(ik);
5309 }
5310
5311 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5312
5313 assert(_klass == ik, "invariant");
5314 return ik;
5315 }
5316
5317 void ClassFileParser::create_acmp_maps(InstanceKlass* ik, TRAPS) {
5318 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5319 // Current format of acmp maps:
5320 // All maps are stored contiguously in a single int array because it might
5321 // be too early to instantiate an Object array (to be investigated)
5322 // Format is:
5323 // [number_of_nonoop_entries][offset0][size0][offset1][size1]...[oop_offset0][oop_offset1]...
5324 // ^ ^
5325 // | |
5326 // --------------------- Pair of integer describing a segment of
5327 // contiguous non-oop fields
5328 // First element is the number of segment of contiguous non-oop fields
5329 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5330 // the offset then the size.
5331 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5332 // per oop field, containing the offset of the field.
5333 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5334 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5335 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1;
5336
5337 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK);
5338 typeArrayHandle map_h(THREAD, map);
5339 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK);
5340
5341 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5342 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length());
5343 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5344 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5345 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5346
5347 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data.
5348 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5349 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5350 }
5351 int oop_map_start = nonoop_acmp_map_size + 1;
5352 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5353 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5354 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5355 }
5356 assert(acmp_maps_array->length() == map_h->length(), "sanity");
5357 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5358 ik->set_acmp_maps_array(acmp_maps_array);
5359 }
5360
5361 // See the declarations of _fast_acmp_offset and _fast_acmp_mask in InlineKlass::Members
5362 // for details about the fast path logic, and the meaning of these values.
5363 void ClassFileParser::set_fast_acmp_members(InlineKlass* vk) const {
5364 if (_layout_info->_oop_acmp_map->length() > 0) { // Oops are not allowed in the fast path
5365 return;
5366 }
5367
5368 int64_t mask = 0;
5369 #ifndef VM_LITTLE_ENDIAN
5370 // Leaving the mask and offset to default values (that is just "return;") is a correct and easy way to implement
5371 // this for other endianness, but it will have a runtime cost in do_acmp, without the benefit. It is better, and
5372 // probably easy with access to such an architecture, to adapt the logic below
5373 // for big-endian architectures, but filling the mask from the other end. I prefer not to do it blindly.
5374 vk->set_fast_acmp_offset(0);
5375 vk->set_fast_acmp_mask(mask);
5376
5377 #else
5378
5379 // Compute the mask for a memory zone with offset "start" and of size "size", both in bytes,
5380 // assuming it won't overflow the long. In little endian, the byte with smallest address/smallest offset/closest from header
5381 // will be the least significant byte.
5382 // Value Memory layout
5383 // make_mask_piece(0, 1) = 0x0000 0000 0000 00ff => ff | 00 | 00 | 00 | 00 | 00 | 00 | 00
5384 // make_mask_piece(0, 1) = 0x0000 0000 0000 ffff => ff | ff | 00 | 00 | 00 | 00 | 00 | 00
5385 // make_mask_piece(1, 1) = 0x0000 0000 0000 ff00 => 00 | ff | 00 | 00 | 00 | 00 | 00 | 00
5386 // make_mask_piece(1, 3) = 0x0000 0000 ffff ff00 => 00 | ff | ff | ff | 00 | 00 | 00 | 00
5387 auto make_mask_piece = [](int start, int size) -> int64_t { return right_n_bits<int64_t>(size * BitsPerByte) << (start * BitsPerByte); };
5388
5389 // We build the mask for a 64-bit load from the start of the payload. For each contiguous piece of memory
5390 // we build the mask containing 1's where it would be in the loaded long: it must be as
5391 // long as the memory that is being accessed, but the placement depends on the endianness.
5392 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5393 int piece_start = _layout_info->_nonoop_acmp_map->at(i)._offset - _layout_info->_payload_offset;
5394 int piece_size = _layout_info->_nonoop_acmp_map->at(i)._size;
5395 int piece_end = piece_start + piece_size - 1;
5396 if (piece_end >= BytesPerLong) { // Too far! Can't fit in an 8-byte load, fast path will not be taken
5397 return;
5398 }
5399 int64_t mask_piece = make_mask_piece(piece_start, piece_size);
5400 mask |= mask_piece;
5401 }
5402
5403 // If the payload is smaller than 64 bits, reading a long after the header can lead to an over-read. To avoid that, we can move the
5404 // load to a lower offset (toward the beginning of the object), and adjust the mask accordingly, even if it means reading (part of)
5405 // the header: the mask will filter that out.
5406 // Since an object cannot be less than 8 bytes, it's surely safe.
5407 if (mask == 0) {
5408 // Special case: empty object. There is nothing to compare, and no payload. We can just read from the start
5409 // of the header to ensure we load within the object. We can't use the general case: count_leading_zeros/count_trailing_zeros doesn't
5410 // accept null argument. This case is endianness-agnostic.
5411 vk->set_fast_acmp_offset(0);
5412 vk->set_fast_acmp_mask(mask);
5413 } else {
5414 // In little endian, if the payload is not a full 64 bits, the mask will have leading 0s (most significant bytes are bytes with
5415 // higher addresses/higher offset/further from the header). We can shift the mask so that there aren't leading 0s anymore, and
5416 // decrease the offset by the same amount.
5417 // For instance, let's say _payload_offset is 16, and the mask is 0x0000 ffff ffff 00ff, we have 16 leading 0s
5418 // (the bubble at offset 1 is fine: it might be due to padding). Reading from the start of the payload might read 2 bytes
5419 // after the end of the payload. To avoid that, we are going to shift the payload by 16 bits, and remove 2 bytes
5420 // from the offset we should load from. At the end, fast_acmp_offset will be 14 and the mask 0xffff ffff 00ff 0000.
5421 // The lowest 16 0s introduced by the shift will filter out the 2 bytes we read from the header.
5422 // Big endian architectures probably need to look at count_trailing_zeros, and shift right until the last bit is 1.
5423 // The offset still needs to be decreased.
5424 int leading_zeroes = static_cast<int>(count_leading_zeros(mask));
5425 assert(leading_zeroes % BitsPerByte == 0, "we should mask full bytes");
5426 mask <<= leading_zeroes;
5427 assert(count_leading_zeros(mask) == 0, "fast acmp mask can be moved further!");
5428 int offset = _layout_info->_payload_offset - leading_zeroes / BitsPerByte;
5429 assert(offset >= 0, "fast acmp path shouldn't load before the object");
5430 vk->set_fast_acmp_offset(offset);
5431 vk->set_fast_acmp_mask(mask);
5432 }
5433 #endif // VM_LITTLE_ENDIAN
5434 }
5435
5436 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5437 bool changed_by_loadhook,
5438 const ClassInstanceInfo& cl_inst_info,
5439 TRAPS) {
5440 assert(ik != nullptr, "invariant");
5441
5442 // Set name and CLD before adding to CLD
5443 ik->set_class_loader_data(_loader_data);
5444 ik->set_class_loader_type();
5445 ik->set_name(_class_name);
5446
5447 // Add all classes to our internal class loader list here,
5448 // including classes in the bootstrap (null) class loader.
5449 const bool publicize = !is_internal();
5450
5451 _loader_data->add_class(ik, publicize);
5452
5453 set_klass_to_deallocate(ik);
5454
5455 assert(_layout_info != nullptr, "invariant");
5456 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5457 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5458 "sanity");
5459
5460 assert(ik->is_instance_klass(), "sanity");
5461 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5462
5463 // Fill in information already parsed
5464 ik->set_should_verify_class(_need_verify);
5465
5466 // Not yet: supers are done below to support the new subtype-checking fields
5467 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5468 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5469 ik->set_has_strict_static_fields(_has_strict_static_fields);
5470
5471 if (_layout_info->_is_naturally_atomic) {
5472 ik->set_is_naturally_atomic();
5473 }
5474
5475 if (_layout_info->_must_be_atomic) {
5476 ik->set_must_be_atomic();
5477 }
5478
5479 ik->set_static_oop_field_count(_static_oop_count);
5480
5481 if (_has_null_restricted_static_fields) {
5482 ik->set_has_null_restricted_static_fields();
5483 for (int i = 0; i < _temp_field_info->length(); i++) {
5484 FieldInfo& fieldinfo = _temp_field_info->at(i);
5485 if (fieldinfo.access_flags().is_static() && fieldinfo.field_flags().is_null_free_inline_type()) {
5486 Symbol* sig = fieldinfo.signature(_cp);
5487 assert(Signature::has_envelope(sig), "Must already have been checked");
5488 TempNewSymbol name = Signature::strip_envelope(sig);
5489 if (name == _class_name) {
5490 // Replace the nullptr previously stored now that we have the InstanceKlass for this klass.
5491 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(ik));
5492 }
5493 assert(_inline_layout_info_array->adr_at(fieldinfo.index())->klass()->is_inline_klass(), "Must be");
5494 }
5495 }
5496 }
5497
5498 // this transfers ownership of a lot of arrays from
5499 // the parser onto the InstanceKlass*
5500 apply_parsed_class_metadata(ik, _java_fields_count);
5501
5502 // can only set dynamic nest-host after static nest information is set
5503 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5504 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5505 }
5506
5507 // note that is not safe to use the fields in the parser from this point on
5508 assert(nullptr == _cp, "invariant");
5509 assert(nullptr == _fieldinfo_stream, "invariant");
5510 assert(nullptr == _fieldinfo_search_table, "invariant");
5511 assert(nullptr == _fields_status, "invariant");
5512 assert(nullptr == _methods, "invariant");
5513 assert(nullptr == _inner_classes, "invariant");
5514 assert(nullptr == _nest_members, "invariant");
5515 assert(nullptr == _loadable_descriptors, "invariant");
5516 assert(nullptr == _combined_annotations, "invariant");
5517 assert(nullptr == _record_components, "invariant");
5518 assert(nullptr == _permitted_subclasses, "invariant");
5519 assert(nullptr == _inline_layout_info_array, "invariant");
5520
5521 if (_has_localvariable_table) {
5522 ik->set_has_localvariable_table(true);
5523 }
5524
5525 if (_has_final_method) {
5526 ik->set_has_final_method();
5527 }
5528
5529 ik->copy_method_ordering(_method_ordering, CHECK);
5530 // The InstanceKlass::_methods_jmethod_ids cache
5531 // is managed on the assumption that the initial cache
5532 // size is equal to the number of methods in the class. If
5533 // that changes, then InstanceKlass::idnum_can_increment()
5534 // has to be changed accordingly.
5535 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5536
5537 ik->set_this_class_index(_this_class_index);
5538
5539 if (_is_hidden) {
5540 // _this_class_index is a CONSTANT_Class entry that refers to this
5541 // hidden class itself. If this class needs to refer to its own methods
5542 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5543 // _this_class_index. However, because this class is hidden (it's
5544 // not stored in SystemDictionary), _this_class_index cannot be resolved
5545 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5546 // Therefore, we must eagerly resolve _this_class_index now.
5547 ik->constants()->klass_at_put(_this_class_index, ik);
5548 }
5549
5550 ik->set_minor_version(_minor_version);
5551 ik->set_major_version(_major_version);
5552 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5553 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5554
5555 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5556
5557 // Set PackageEntry for this_klass
5558 oop cl = ik->class_loader();
5559 Handle clh = Handle(THREAD, cl);
5560 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5561 ik->set_package(cld, nullptr, CHECK);
5562
5563 const Array<Method*>* const methods = ik->methods();
5564 assert(methods != nullptr, "invariant");
5565 const int methods_len = methods->length();
5566
5567 check_methods_for_intrinsics(ik, methods);
5568
5569 // Fill in field values obtained by parse_classfile_attributes
5570 if (_parsed_annotations->has_any_annotations())
5571 _parsed_annotations->apply_to(ik);
5572
5573 apply_parsed_class_attributes(ik);
5574
5575 // Miranda methods
5576 if ((_num_miranda_methods > 0) ||
5577 // if this class introduced new miranda methods or
5578 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5579 // super class exists and this class inherited miranda methods
5580 ) {
5581 ik->set_has_miranda_methods(); // then set a flag
5582 }
5583
5584 // Fill in information needed to compute superclasses.
5585 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5586 ik->set_transitive_interfaces(_transitive_interfaces);
5587 ik->set_local_interfaces(_local_interfaces);
5588 _transitive_interfaces = nullptr;
5589 _local_interfaces = nullptr;
5590
5591 // Initialize itable offset tables
5592 klassItable::setup_itable_offset_table(ik);
5593
5594 // Compute transitive closure of interfaces this class implements
5595 // Do final class setup
5596 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5597 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5598 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5599 }
5600
5601 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5602 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5603 ik->set_has_contended_annotations(true);
5604 }
5605
5606 // Fill in has_finalizer and layout_helper
5607 set_precomputed_flags(ik);
5608
5609 // check if this class can access its super class
5610 check_super_class_access(ik, CHECK);
5611
5612 // check if this class can access its superinterfaces
5613 check_super_interface_access(ik, CHECK);
5614
5615 // check if this class overrides any final method
5616 check_final_method_override(ik, CHECK);
5617
5618 // reject static interface methods prior to Java 8
5619 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5620 check_illegal_static_method(ik, CHECK);
5621 }
5622
5623 // Obtain this_klass' module entry
5624 ModuleEntry* module_entry = ik->module();
5625 assert(module_entry != nullptr, "module_entry should always be set");
5626
5627 // Obtain java.lang.Module
5628 Handle module_handle(THREAD, module_entry->module_oop());
5629
5630 // Allocate mirror and initialize static fields
5631 java_lang_Class::create_mirror(ik,
5632 Handle(THREAD, _loader_data->class_loader()),
5633 module_handle,
5634 _protection_domain,
5635 cl_inst_info.class_data(),
5636 CHECK);
5637
5638 assert(_all_mirandas != nullptr, "invariant");
5639
5640 // Generate any default methods - default methods are public interface methods
5641 // that have a default implementation. This is new with Java 8.
5642 if (_has_nonstatic_concrete_methods) {
5643 DefaultMethods::generate_default_methods(ik,
5644 _all_mirandas,
5645 CHECK);
5646 }
5647
5648 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5649 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5650 !module_entry->has_default_read_edges()) {
5651 if (!module_entry->set_has_default_read_edges()) {
5652 // We won a potential race
5653 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5654 }
5655 }
5656
5657 if (is_inline_type()) {
5658 InlineKlass* vk = InlineKlass::cast(ik);
5659 vk->set_payload_alignment(_layout_info->_payload_alignment);
5660 vk->set_payload_offset(_layout_info->_payload_offset);
5661 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5662 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5663 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5664 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5665 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5666 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5667 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5668 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5669 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5670
5671 if (UseAcmpFastPath) {
5672 set_fast_acmp_members(vk);
5673 }
5674
5675 vk->initialize_calling_convention(CHECK);
5676 }
5677
5678 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5679 && _class_name != vmSymbols::java_lang_Object()) {
5680 // Both abstract and concrete value classes need a field map for acmp
5681 create_acmp_maps(ik, CHECK);
5682 }
5683
5684 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5685
5686 if (!is_internal()) {
5687 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5688 if (CDSConfig::is_dumping_archive()) {
5689 SystemDictionaryShared::check_code_source(ik, _stream);
5690 }
5691
5692 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5693 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5694 log_is_enabled(Info, class, preview)) {
5695 ResourceMark rm;
5696 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5697 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5698 }
5699
5700 if (log_is_enabled(Debug, class, resolve)) {
5701 ResourceMark rm;
5702 // print out the superclass.
5703 const char * from = ik->external_name();
5704 if (ik->super() != nullptr) {
5705 log_debug(class, resolve)("%s %s (super)",
5706 from,
5707 ik->super()->external_name());
5708 }
5709 // print out each of the interface classes referred to by this class.
5710 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5711 if (local_interfaces != nullptr) {
5712 const int length = local_interfaces->length();
5713 for (int i = 0; i < length; i++) {
5714 const InstanceKlass* const k = local_interfaces->at(i);
5715 const char * to = k->external_name();
5716 log_debug(class, resolve)("%s %s (interface)", from, to);
5717 }
5718 }
5719 }
5720 }
5721
5722 // If we reach here, all is well.
5723 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5724 // in order for it to not be destroyed in the ClassFileParser destructor.
5725 set_klass_to_deallocate(nullptr);
5726
5727 // it's official
5728 set_klass(ik);
5729
5730 DEBUG_ONLY(ik->verify();)
5731 }
5732
5733 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5734 // Decrement the refcount in the old name, since we're clobbering it.
5735 _class_name->decrement_refcount();
5736
5737 _class_name = new_class_name;
5738 // Increment the refcount of the new name.
5739 // Now the ClassFileParser owns this name and will decrement in
5740 // the destructor.
5741 _class_name->increment_refcount();
5742 }
5743
5744 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5745 Symbol* name,
5746 ClassLoaderData* loader_data,
5747 const ClassLoadInfo* cl_info,
5748 Publicity pub_level,
5749 TRAPS) :
5750 _stream(stream),
5751 _class_name(nullptr),
5752 _loader_data(loader_data),
5753 _is_hidden(cl_info->is_hidden()),
5754 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5755 _orig_cp_size(0),
5756 _static_oop_count(0),
5757 _super_klass(),
5758 _cp(nullptr),
5759 _fieldinfo_stream(nullptr),
5760 _fieldinfo_search_table(nullptr),
5761 _fields_status(nullptr),
5762 _methods(nullptr),
5763 _inner_classes(nullptr),
5764 _nest_members(nullptr),
5765 _nest_host(0),
5766 _permitted_subclasses(nullptr),
5767 _loadable_descriptors(nullptr),
5768 _record_components(nullptr),
5769 _local_interfaces(nullptr),
5770 _transitive_interfaces(nullptr),
5771 _combined_annotations(nullptr),
5772 _class_annotations(nullptr),
5773 _class_type_annotations(nullptr),
5774 _fields_annotations(nullptr),
5775 _fields_type_annotations(nullptr),
5776 _klass(nullptr),
5777 _klass_to_deallocate(nullptr),
5778 _parsed_annotations(nullptr),
5779 _layout_info(nullptr),
5780 _inline_layout_info_array(nullptr),
5781 _temp_field_info(nullptr),
5782 _method_ordering(nullptr),
5783 _all_mirandas(nullptr),
5784 _vtable_size(0),
5785 _itable_size(0),
5786 _num_miranda_methods(0),
5787 _protection_domain(cl_info->protection_domain()),
5788 _access_flags(),
5789 _pub_level(pub_level),
5790 _bad_constant_seen(0),
5791 _synthetic_flag(false),
5792 _sde_length(false),
5793 _sde_buffer(nullptr),
5794 _sourcefile_index(0),
5795 _generic_signature_index(0),
5796 _major_version(0),
5797 _minor_version(0),
5798 _this_class_index(0),
5799 _super_class_index(0),
5800 _itfs_len(0),
5801 _java_fields_count(0),
5802 _need_verify(false),
5803 _has_nonstatic_concrete_methods(false),
5804 _declares_nonstatic_concrete_methods(false),
5805 _has_localvariable_table(false),
5806 _has_final_method(false),
5807 _has_contended_fields(false),
5808 _has_aot_runtime_setup_method(false),
5809 _has_strict_static_fields(false),
5810 _has_null_restricted_static_fields(false),
5811 _must_be_atomic(true),
5812 _has_finalizer(false),
5813 _has_empty_finalizer(false),
5814 _max_bootstrap_specifier_index(-1) {
5815
5816 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5817 _class_name->increment_refcount();
5818
5819 assert(_loader_data != nullptr, "invariant");
5820 assert(stream != nullptr, "invariant");
5821 assert(_stream != nullptr, "invariant");
5822 assert(_stream->buffer() == _stream->current(), "invariant");
5823 assert(_class_name != nullptr, "invariant");
5824 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5825
5826 // Figure out whether we can skip format checking (matching classic VM behavior)
5827 // Always verify CFLH bytes from the user agents.
5828 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5829
5830 // synch back verification state to stream to check for truncation.
5831 stream->set_need_verify(_need_verify);
5832
5833 parse_stream(stream, CHECK);
5834
5835 post_process_parsed_stream(stream, _cp, CHECK);
5836 }
5837
5838 void ClassFileParser::clear_class_metadata() {
5839 // metadata created before the instance klass is created. Must be
5840 // deallocated if classfile parsing returns an error.
5841 _cp = nullptr;
5842 _fieldinfo_stream = nullptr;
5843 _fieldinfo_search_table = nullptr;
5844 _fields_status = nullptr;
5845 _methods = nullptr;
5846 _inner_classes = nullptr;
5847 _nest_members = nullptr;
5848 _permitted_subclasses = nullptr;
5849 _loadable_descriptors = nullptr;
5850 _combined_annotations = nullptr;
5851 _class_annotations = _class_type_annotations = nullptr;
5852 _fields_annotations = _fields_type_annotations = nullptr;
5853 _record_components = nullptr;
5854 _inline_layout_info_array = nullptr;
5855 }
5856
5857 // Destructor to clean up
5858 ClassFileParser::~ClassFileParser() {
5859 _class_name->decrement_refcount();
5860
5861 if (_cp != nullptr) {
5862 MetadataFactory::free_metadata(_loader_data, _cp);
5863 }
5864
5865 if (_fieldinfo_stream != nullptr) {
5866 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5867 }
5868 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5869
5870 if (_fields_status != nullptr) {
5871 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5872 }
5873
5874 if (_inline_layout_info_array != nullptr) {
5875 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5876 }
5877
5878 if (_methods != nullptr) {
5879 // Free methods
5880 InstanceKlass::deallocate_methods(_loader_data, _methods);
5881 }
5882
5883 // beware of the Universe::empty_blah_array!!
5884 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5885 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5886 }
5887
5888 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5889 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5890 }
5891
5892 if (_record_components != nullptr) {
5893 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5894 }
5895
5896 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5897 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5898 }
5899
5900 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5901 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5902 }
5903
5904 // Free interfaces
5905 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5906 _local_interfaces, _transitive_interfaces);
5907
5908 if (_combined_annotations != nullptr) {
5909 // After all annotations arrays have been created, they are installed into the
5910 // Annotations object that will be assigned to the InstanceKlass being created.
5911
5912 // Deallocate the Annotations object and the installed annotations arrays.
5913 _combined_annotations->deallocate_contents(_loader_data);
5914
5915 // If the _combined_annotations pointer is non-null,
5916 // then the other annotations fields should have been cleared.
5917 assert(_class_annotations == nullptr, "Should have been cleared");
5918 assert(_class_type_annotations == nullptr, "Should have been cleared");
5919 assert(_fields_annotations == nullptr, "Should have been cleared");
5920 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5921 } else {
5922 // If the annotations arrays were not installed into the Annotations object,
5923 // then they have to be deallocated explicitly.
5924 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5925 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5926 Annotations::free_contents(_loader_data, _fields_annotations);
5927 Annotations::free_contents(_loader_data, _fields_type_annotations);
5928 }
5929
5930 clear_class_metadata();
5931 _transitive_interfaces = nullptr;
5932 _local_interfaces = nullptr;
5933
5934 // deallocate the klass if already created. Don't directly deallocate, but add
5935 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5936 // at a safepoint.
5937 if (_klass_to_deallocate != nullptr) {
5938 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5939 }
5940 }
5941
5942 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5943 TRAPS) {
5944
5945 assert(stream != nullptr, "invariant");
5946 assert(_class_name != nullptr, "invariant");
5947
5948 // BEGIN STREAM PARSING
5949 stream->guarantee_more(8, CHECK); // magic, major, minor
5950 // Magic value
5951 const u4 magic = stream->get_u4_fast();
5952 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5953 "Incompatible magic value %u in class file %s",
5954 magic, CHECK);
5955
5956 // Version numbers
5957 _minor_version = stream->get_u2_fast();
5958 _major_version = stream->get_u2_fast();
5959
5960 // Check version numbers - we check this even with verifier off
5961 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5962
5963 stream->guarantee_more(3, CHECK); // length, first cp tag
5964 u2 cp_size = stream->get_u2_fast();
5965
5966 guarantee_property(
5967 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5968 cp_size, CHECK);
5969
5970 _orig_cp_size = cp_size;
5971 if (is_hidden()) { // Add a slot for hidden class name.
5972 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK);
5973 cp_size++;
5974 }
5975
5976 _cp = ConstantPool::allocate(_loader_data,
5977 cp_size,
5978 CHECK);
5979
5980 ConstantPool* const cp = _cp;
5981
5982 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5983
5984 assert(cp_size == (u2)cp->length(), "invariant");
5985
5986 // ACCESS FLAGS
5987 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5988
5989 // Access flags
5990 u2 flags;
5991 // JVM_ACC_MODULE is defined in JDK-9 and later.
5992 if (_major_version >= JAVA_9_VERSION) {
5993 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5994 } else {
5995 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5996 }
5997
5998 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5999 // Set abstract bit for old class files for backward compatibility
6000 flags |= JVM_ACC_ABSTRACT;
6001 }
6002
6003 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
6004 if (!supports_inline_types()) {
6005 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6006 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6007 if (!is_module && !is_interface) {
6008 flags |= JVM_ACC_IDENTITY;
6009 }
6010 }
6011
6012 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
6013
6014 short bad_constant = class_bad_constant_seen();
6015 if (bad_constant != 0) {
6016 // Do not throw CFE until after the access_flags are checked because if
6017 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6018 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6019 return;
6020 }
6021
6022 _access_flags.set_flags(flags);
6023
6024 // This class and superclass
6025 _this_class_index = stream->get_u2_fast();
6026 guarantee_property(
6027 valid_cp_range(_this_class_index, cp_size) &&
6028 cp->tag_at(_this_class_index).is_unresolved_klass(),
6029 "Invalid this class index %u in constant pool in class file %s",
6030 _this_class_index, CHECK);
6031
6032 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6033 assert(class_name_in_cp != nullptr, "class_name can't be null");
6034
6035 // Don't need to check whether this class name is legal or not.
6036 // It has been checked when constant pool is parsed.
6037 // However, make sure it is not an array type.
6038 if (_need_verify) {
6039 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6040 "Bad class name in class file %s",
6041 CHECK);
6042 }
6043
6044 #ifdef ASSERT
6045 // Basic sanity checks
6046 if (_is_hidden) {
6047 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6048 }
6049 #endif
6050
6051 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
6052
6053 if (_is_hidden) {
6054 assert(_class_name != nullptr, "Unexpected null _class_name");
6055 #ifdef ASSERT
6056 if (_need_verify) {
6057 verify_legal_class_name(_class_name, CHECK);
6058 }
6059 #endif
6060
6061 } else {
6062 // Check if name in class file matches given name
6063 if (_class_name != class_name_in_cp) {
6064 if (_class_name != vmSymbols::unknown_class_name()) {
6065 ResourceMark rm(THREAD);
6066 // Names are all known to be < 64k so we know this formatted message is not excessively large.
6067 Exceptions::fthrow(THREAD_AND_LOCATION,
6068 vmSymbols::java_lang_NoClassDefFoundError(),
6069 "%s (wrong name: %s)",
6070 _class_name->as_C_string(),
6071 class_name_in_cp->as_C_string()
6072 );
6073 return;
6074 } else {
6075 // The class name was not known by the caller so we set it from
6076 // the value in the CP.
6077 update_class_name(class_name_in_cp);
6078 }
6079 // else nothing to do: the expected class name matches what is in the CP
6080 }
6081 }
6082
6083 // Verification prevents us from creating names with dots in them, this
6084 // asserts that that's the case.
6085 assert(is_internal_format(_class_name), "external class name format used internally");
6086
6087 if (!is_internal()) {
6088 LogTarget(Debug, class, preorder) lt;
6089 if (lt.is_enabled()){
6090 ResourceMark rm(THREAD);
6091 LogStream ls(lt);
6092 ls.print("%s", _class_name->as_klass_external_name());
6093 if (stream->source() != nullptr) {
6094 ls.print(" source: %s", stream->source());
6095 }
6096 ls.cr();
6097 }
6098 }
6099
6100 // SUPERKLASS
6101 _super_class_index = stream->get_u2_fast();
6102 check_super_class(cp,
6103 _super_class_index,
6104 _need_verify,
6105 CHECK);
6106
6107 // Interfaces
6108 _itfs_len = stream->get_u2_fast();
6109 parse_interfaces(stream,
6110 _itfs_len,
6111 cp,
6112 &_has_nonstatic_concrete_methods,
6113 CHECK);
6114
6115 assert(_local_interfaces != nullptr, "invariant");
6116
6117 // Fields (offsets are filled in later)
6118 parse_fields(stream,
6119 _access_flags,
6120 cp,
6121 cp_size,
6122 &_java_fields_count,
6123 CHECK);
6124
6125 assert(_temp_field_info != nullptr, "invariant");
6126
6127 // Methods
6128 parse_methods(stream,
6129 _access_flags.is_interface(),
6130 &_has_localvariable_table,
6131 &_has_final_method,
6132 &_declares_nonstatic_concrete_methods,
6133 CHECK);
6134
6135 assert(_methods != nullptr, "invariant");
6136
6137 if (_declares_nonstatic_concrete_methods) {
6138 _has_nonstatic_concrete_methods = true;
6139 }
6140
6141 // Additional attributes/annotations
6142 _parsed_annotations = new ClassAnnotationCollector();
6143 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6144
6145 assert(_inner_classes != nullptr, "invariant");
6146
6147 // Finalize the Annotations metadata object,
6148 // now that all annotation arrays have been created.
6149 create_combined_annotations(CHECK);
6150
6151 // Make sure this is the end of class file stream
6152 guarantee_property(stream->at_eos(),
6153 "Extra bytes at the end of class file %s",
6154 CHECK);
6155
6156 // all bytes in stream read and parsed
6157 }
6158
6159 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6160 ResourceMark rm;
6161 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6162 // use a '/' because that confuses finding the class's package. Also, can't
6163 // use an illegal char such as ';' because that causes serialization issues
6164 // and issues with hidden classes that create their own hidden classes.
6165 char addr_buf[20];
6166 if (CDSConfig::is_dumping_static_archive()) {
6167 // We want stable names for the archived hidden classes (only for static
6168 // archive for now). Spaces under default_SharedBaseAddress() will be
6169 // occupied by the archive at run time, so we know that no dynamically
6170 // loaded InstanceKlass will be placed under there.
6171 static volatile size_t counter = 0;
6172 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6173 size_t new_id = AtomicAccess::add(&counter, (size_t)1);
6174 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
6175 } else {
6176 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6177 }
6178 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6179 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6180 jio_snprintf(new_name, new_name_len, "%s+%s",
6181 _class_name->as_C_string(), addr_buf);
6182 update_class_name(SymbolTable::new_symbol(new_name));
6183
6184 // Add a Utf8 entry containing the hidden name.
6185 assert(_class_name != nullptr, "Unexpected null _class_name");
6186 int hidden_index = _orig_cp_size; // this is an extra slot we added
6187 _cp->symbol_at_put(hidden_index, _class_name);
6188
6189 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6190 // We have to update the resolved_klass_index and the name_index together
6191 // so extract the existing resolved_klass_index first.
6192 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6193 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6194 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6195 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6196 "Bad name_index");
6197 }
6198
6199 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6200 ConstantPool* cp,
6201 TRAPS) {
6202 assert(stream != nullptr, "invariant");
6203 assert(stream->at_eos(), "invariant");
6204 assert(cp != nullptr, "invariant");
6205 assert(_loader_data != nullptr, "invariant");
6206
6207 if (_class_name == vmSymbols::java_lang_Object()) {
6208 precond(_super_class_index == 0);
6209 precond(_super_klass == nullptr);
6210 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6211 "java.lang.Object cannot implement an interface in class file %s",
6212 CHECK);
6213 } else {
6214 // Set _super_klass after class file is parsed and format is checked
6215 assert(_super_class_index > 0, "any class other than Object must have a super class");
6216 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6217 if (_access_flags.is_interface()) {
6218 // Before attempting to resolve the superclass, check for class format
6219 // errors not checked yet.
6220 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6221 "Interfaces must have java.lang.Object as superclass in class file %s",
6222 CHECK);
6223 }
6224 Handle loader(THREAD, _loader_data->class_loader());
6225 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6226 // fast path to avoid lookup
6227 _super_klass = vmClasses::Object_klass();
6228 } else {
6229 _super_klass = (const InstanceKlass*)
6230 SystemDictionary::resolve_super_or_fail(_class_name,
6231 super_class_name,
6232 loader,
6233 true,
6234 CHECK);
6235 }
6236 }
6237
6238 if (_super_klass != nullptr) {
6239 if (_super_klass->is_interface()) {
6240 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6241 return;
6242 }
6243
6244 if (_super_klass->is_final()) {
6245 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6246 return;
6247 }
6248
6249 if (Arguments::is_valhalla_enabled()) {
6250 // If this class is a value class, its super class cannot be an identity class unless it is java.lang.Object.
6251 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() &&
6252 _super_klass != vmClasses::Object_klass()) {
6253 ResourceMark rm(THREAD);
6254 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6255 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string()));
6256 }
6257 }
6258
6259 if (_super_klass->has_nonstatic_concrete_methods()) {
6260 _has_nonstatic_concrete_methods = true;
6261 }
6262 }
6263
6264 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6265 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6266 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6267 _class_name->as_klass_external_name()));
6268 }
6269
6270 // Determining if the class allows tearing or not (default is not)
6271 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6272 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6273 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6274 // Conditions above are not sufficient to determine atomicity requirements.
6275 // Fields with atomicity requirements could force the current class to have atomicity requirements too.
6276 // Mark as not needing atomicity for now - can be updated when computing the fields layout.
6277 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6278 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6279 _must_be_atomic = false;
6280 }
6281 // Apply VM options override
6282 if (*ForceNonTearable != '\0') {
6283 // Allow a command line switch to force the same atomicity property:
6284 ResourceMark rm(THREAD);
6285 const char* class_name_str = _class_name->as_C_string();
6286 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6287 _must_be_atomic = true;
6288 }
6289 }
6290 }
6291
6292 // Compute the transitive list of all unique interfaces implemented by this class
6293 _transitive_interfaces =
6294 compute_transitive_interfaces(_super_klass,
6295 _local_interfaces,
6296 _loader_data,
6297 CHECK);
6298
6299 assert(_transitive_interfaces != nullptr, "invariant");
6300
6301 // sort methods
6302 _method_ordering = sort_methods(_methods);
6303
6304 _all_mirandas = new GrowableArray<Method*>(20);
6305
6306 Handle loader(THREAD, _loader_data->class_loader());
6307 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6308 &_num_miranda_methods,
6309 _all_mirandas,
6310 _super_klass,
6311 _methods,
6312 _access_flags,
6313 _major_version,
6314 loader,
6315 _class_name,
6316 _local_interfaces);
6317
6318 // Size of Java itable (in words)
6319 _itable_size = is_interface() ? 0 :
6320 klassItable::compute_itable_size(_transitive_interfaces);
6321
6322 assert(_parsed_annotations != nullptr, "invariant");
6323
6324 if (Arguments::is_valhalla_enabled()) {
6325 fetch_field_classes(cp, CHECK);
6326 }
6327
6328 _layout_info = new FieldLayoutInfo();
6329 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6330 _parsed_annotations->is_contended(), is_inline_type(),
6331 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6332 _must_be_atomic, _layout_info, _inline_layout_info_array);
6333 lb.build_layout();
6334
6335 // If it turned out that we didn't inline any of the fields, we deallocate
6336 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6337 // transferred to the allocated InstanceKlass.
6338 if (_inline_layout_info_array != nullptr && !(_layout_info->_has_inlined_fields || _has_null_restricted_static_fields)) {
6339 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6340 _inline_layout_info_array = nullptr;
6341 }
6342
6343 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6344 _fieldinfo_stream =
6345 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6346 injected_fields_count, loader_data(), CHECK);
6347 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6348 _fields_status =
6349 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6350 FieldStatus(0), CHECK);
6351
6352 // Strict static fields track initialization status from the beginning of time.
6353 // After this class runs <clinit>, they will be verified as being "not unset".
6354 // See Step 8 of InstanceKlass::initialize_impl.
6355 if (_has_strict_static_fields) {
6356 bool found_one = false;
6357 for (int i = 0; i < _temp_field_info->length(); i++) {
6358 FieldInfo& fi = *_temp_field_info->adr_at(i);
6359 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6360 found_one = true;
6361 if (fi.initializer_index() != 0) {
6362 // skip strict static fields with ConstantValue attributes
6363 } else {
6364 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6365 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6366 }
6367 }
6368 }
6369 assert(found_one == _has_strict_static_fields,
6370 "correct prediction = %d", (int)_has_strict_static_fields);
6371 }
6372 }
6373
6374 // In order to be able to optimize field layouts by applying heap flattening,
6375 // the JVM needs to know the layout of the class of the fields, which implies
6376 // having these classes loaded. The strategy has two folds:
6377 // 1 - if the current class has a LoadableDescriptors attribute containing the
6378 // name of the class of the field and PreloadClasses is true, the JVM will
6379 // try to speculatively load this class. Failures to load the class are
6380 // silently discarded, and loads resulting in a non-optimizable class
6381 // are ignored
6382 // 2 - if step 1 cannot be applied, the JVM will simply check if the class
6383 // loader of the current class already knows these classes (no class
6384 // loading triggered in this case). Note that the migrated value classes
6385 // of the JDK are automatically registered to all class loaders, and
6386 // are guaranteed to be found in this step even if the current class
6387 // has not been recompiled with JEP 401 features enabled
6388 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) {
6389 for (int i = 0; i < _temp_field_info->length(); i++) {
6390 FieldInfo& fieldinfo = _temp_field_info->at(i);
6391 if (fieldinfo.access_flags().is_static() && !fieldinfo.field_flags().is_null_free_inline_type()) continue;
6392 Symbol* sig = fieldinfo.signature(cp);
6393 if (Signature::has_envelope(sig)) {
6394 TempNewSymbol name = Signature::strip_envelope(sig);
6395 if (name == _class_name) {
6396 if (fieldinfo.field_flags().is_null_free_inline_type() && !is_inline_type()) {
6397 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6398 } else {
6399 // Dummy setting to trigger the allocation of the inline_layout_info array -
6400 // the real pointer will be set later in ::fill_instance_klass, once the InlineKlass has been allocated.
6401 set_inline_layout_info_klass(fieldinfo.index(), nullptr, CHECK);
6402 }
6403 continue;
6404 }
6405 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) {
6406 ResourceMark rm(THREAD);
6407 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6408 "Cause: field type in LoadableDescriptors attribute",
6409 name->as_C_string(), _class_name->as_C_string());
6410 oop loader = loader_data()->class_loader();
6411 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6412 Handle(THREAD, loader),
6413 false, THREAD);
6414
6415 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6416
6417 if (klass != nullptr) {
6418 if (klass->is_inline_klass()) {
6419 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6420 log_info(class, preload)("Preloading of class %s during loading of class %s "
6421 "(cause: field type in LoadableDescriptors attribute) succeeded",
6422 name->as_C_string(), _class_name->as_C_string());
6423 } else {
6424 // Non value classes are allowed by the current spec, but it could be an indication of an issue so let's log this
6425 log_info(class, preload)("Preloading of class %s during loading of class %s "
6426 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6427 name->as_C_string(), _class_name->as_C_string());
6428 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6429 log_warning(class, preload)("After preloading of class %s during loading of class %s "
6430 "field was annotated with @NullRestricted but loaded class is not a value class, "
6431 "the annotation is ignored",
6432 name->as_C_string(), _class_name->as_C_string());
6433 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6434 }
6435 }
6436 } else {
6437 log_info(class, preload)("Preloading of class %s during loading of class %s "
6438 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6439 name->as_C_string(), _class_name->as_C_string(),
6440 PENDING_EXCEPTION->klass()->name()->as_C_string());
6441 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6442 log_warning(class, preload)("After preloading of class %s during loading of class %s failed,"
6443 "field was annotated with @NullRestricted but class is unknown, "
6444 "the annotation is ignored",
6445 name->as_C_string(), _class_name->as_C_string());
6446 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6447 }
6448
6449 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6450 // impact loading of current class.
6451 CLEAR_PENDING_EXCEPTION;
6452 }
6453 } else {
6454 oop loader = loader_data()->class_loader();
6455 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6456 if (klass != nullptr && klass->is_inline_klass()) {
6457 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6458 ResourceMark rm(THREAD);
6459 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary"
6460 "(field type not in LoadableDescriptors attribute)",
6461 _class_name->as_C_string(), name->as_C_string());
6462 } else if (fieldinfo.field_flags().is_null_free_inline_type()) {
6463 ResourceMark rm(THREAD);
6464 if (klass == nullptr) {
6465 log_warning(class, preload)("During loading of class %s, class %s is unknown, "
6466 "but a field of this type was annotated with @NullRestricted, "
6467 "the annotation is ignored",
6468 _class_name->as_C_string(), name->as_C_string());
6469 } else {
6470 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary "
6471 "and is not a concrete value class, but a field of this type was annotated with "
6472 "@NullRestricted, the annotation is ignored",
6473 _class_name->as_C_string(), name->as_C_string());
6474 }
6475 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6476 }
6477 }
6478 }
6479 }
6480 }
6481
6482 void ClassFileParser::set_klass(InstanceKlass* klass) {
6483
6484 #ifdef ASSERT
6485 if (klass != nullptr) {
6486 assert(nullptr == _klass, "leaking?");
6487 }
6488 #endif
6489
6490 _klass = klass;
6491 }
6492
6493 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6494 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6495
6496 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6497 // never allocated for an InstanceKlass which has no need for this information.
6498 if (_inline_layout_info_array == nullptr) {
6499 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6500 java_fields_count(),
6501 CHECK);
6502 }
6503
6504 // Set the Klass for the field's index
6505 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6506 }
6507
6508 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6509
6510 #ifdef ASSERT
6511 if (klass != nullptr) {
6512 assert(nullptr == _klass_to_deallocate, "leaking?");
6513 }
6514 #endif
6515
6516 _klass_to_deallocate = klass;
6517 }
6518
6519 // Caller responsible for ResourceMark
6520 // clone stream with rewound position
6521 const ClassFileStream* ClassFileParser::clone_stream() const {
6522 assert(_stream != nullptr, "invariant");
6523
6524 return _stream->clone();
6525 }
6526
6527 ReferenceType ClassFileParser::super_reference_type() const {
6528 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6529 }
6530
6531 bool ClassFileParser::is_instance_ref_klass() const {
6532 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6533 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6534 // klass requiring special treatment in ref-processing. The abstract
6535 // j.l.r.Reference cannot be instantiated so doesn't partake in
6536 // ref-processing.
6537 return is_java_lang_ref_Reference_subclass();
6538 }
6539
6540 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6541 if (_super_klass == nullptr) {
6542 return false;
6543 }
6544
6545 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6546 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6547 return true;
6548 }
6549
6550 return _super_klass->reference_type() != REF_NONE;
6551 }
6552
6553 // ----------------------------------------------------------------------------
6554 // debugging
6555
6556 #ifdef ASSERT
6557
6558 // return true if class_name contains no '.' (internal format is '/')
6559 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6560 if (class_name != nullptr) {
6561 ResourceMark rm;
6562 char* name = class_name->as_C_string();
6563 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6564 } else {
6565 return true;
6566 }
6567 }
6568
6569 #endif