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 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
161 assert((bad_constant == JVM_CONSTANT_Module ||
162 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
163 "Unexpected bad constant pool entry");
164 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
165 }
166
167 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
168 ConstantPool* cp,
169 const int length,
170 TRAPS) {
171 assert(stream != nullptr, "invariant");
172 assert(cp != nullptr, "invariant");
173
174 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
175 // this function (_current can be allocated in a register, with scalar
176 // replacement of aggregates). The _current pointer is copied back to
177 // stream() when this function returns. DON'T call another method within
178 // this method that uses stream().
179 const ClassFileStream cfs1 = *stream;
180 const ClassFileStream* const cfs = &cfs1;
181
182 DEBUG_ONLY(const u1* const old_current = stream->current();)
183
184 // Used for batching symbol allocations.
185 const char* names[SymbolTable::symbol_alloc_batch_size];
186 int lengths[SymbolTable::symbol_alloc_batch_size];
187 int indices[SymbolTable::symbol_alloc_batch_size];
188 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
189 int names_count = 0;
190
191 // parsing Index 0 is unused
192 for (int index = 1; index < length; index++) {
193 // Each of the following case guarantees one more byte in the stream
194 // for the following tag or the access_flags following constant pool,
195 // so we don't need bounds-check for reading tag.
196 const u1 tag = cfs->get_u1_fast();
197 switch (tag) {
198 case JVM_CONSTANT_Class: {
199 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
200 const u2 name_index = cfs->get_u2_fast();
201 cp->klass_index_at_put(index, name_index);
202 break;
203 }
204 case JVM_CONSTANT_Fieldref: {
205 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
206 const u2 class_index = cfs->get_u2_fast();
207 const u2 name_and_type_index = cfs->get_u2_fast();
208 cp->field_at_put(index, class_index, name_and_type_index);
209 break;
210 }
211 case JVM_CONSTANT_Methodref: {
212 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
213 const u2 class_index = cfs->get_u2_fast();
214 const u2 name_and_type_index = cfs->get_u2_fast();
215 cp->method_at_put(index, class_index, name_and_type_index);
216 break;
217 }
218 case JVM_CONSTANT_InterfaceMethodref: {
219 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
220 const u2 class_index = cfs->get_u2_fast();
221 const u2 name_and_type_index = cfs->get_u2_fast();
222 cp->interface_method_at_put(index, class_index, name_and_type_index);
223 break;
224 }
225 case JVM_CONSTANT_String : {
226 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
227 const u2 string_index = cfs->get_u2_fast();
228 cp->string_index_at_put(index, string_index);
229 break;
230 }
231 case JVM_CONSTANT_MethodHandle :
232 case JVM_CONSTANT_MethodType: {
233 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
234 classfile_parse_error(
235 "Class file version does not support constant tag %u in class file %s",
236 tag, THREAD);
237 return;
238 }
239 if (tag == JVM_CONSTANT_MethodHandle) {
240 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
241 const u1 ref_kind = cfs->get_u1_fast();
242 const u2 method_index = cfs->get_u2_fast();
243 cp->method_handle_index_at_put(index, ref_kind, method_index);
244 }
245 else if (tag == JVM_CONSTANT_MethodType) {
246 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
247 const u2 signature_index = cfs->get_u2_fast();
248 cp->method_type_index_at_put(index, signature_index);
249 }
250 else {
251 ShouldNotReachHere();
252 }
253 break;
254 }
255 case JVM_CONSTANT_Dynamic : {
256 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
257 classfile_parse_error(
258 "Class file version does not support constant tag %u in class file %s",
259 tag, THREAD);
260 return;
261 }
262 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
263 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
264 const u2 name_and_type_index = cfs->get_u2_fast();
265 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
266 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
267 }
268 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
269 break;
270 }
271 case JVM_CONSTANT_InvokeDynamic : {
272 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
273 classfile_parse_error(
274 "Class file version does not support constant tag %u in class file %s",
275 tag, THREAD);
276 return;
277 }
278 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
279 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
280 const u2 name_and_type_index = cfs->get_u2_fast();
281 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
282 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
283 }
284 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
285 break;
286 }
287 case JVM_CONSTANT_Integer: {
288 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
289 const u4 bytes = cfs->get_u4_fast();
290 cp->int_at_put(index, (jint)bytes);
291 break;
292 }
293 case JVM_CONSTANT_Float: {
294 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
295 const u4 bytes = cfs->get_u4_fast();
296 cp->float_at_put(index, *(jfloat*)&bytes);
297 break;
298 }
299 case JVM_CONSTANT_Long: {
300 // A mangled type might cause you to overrun allocated memory
301 guarantee_property(index + 1 < length,
302 "Invalid constant pool entry %u in class file %s",
303 index,
304 CHECK);
305 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
306 const u8 bytes = cfs->get_u8_fast();
307 cp->long_at_put(index, bytes);
308 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
309 break;
310 }
311 case JVM_CONSTANT_Double: {
312 // A mangled type might cause you to overrun allocated memory
313 guarantee_property(index+1 < length,
314 "Invalid constant pool entry %u in class file %s",
315 index,
316 CHECK);
317 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
318 const u8 bytes = cfs->get_u8_fast();
319 cp->double_at_put(index, *(jdouble*)&bytes);
320 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
321 break;
322 }
323 case JVM_CONSTANT_NameAndType: {
324 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
325 const u2 name_index = cfs->get_u2_fast();
326 const u2 signature_index = cfs->get_u2_fast();
327 cp->name_and_type_at_put(index, name_index, signature_index);
328 break;
329 }
330 case JVM_CONSTANT_Utf8 : {
331 cfs->guarantee_more(2, CHECK); // utf8_length
332 u2 utf8_length = cfs->get_u2_fast();
333 const u1* utf8_buffer = cfs->current();
334 assert(utf8_buffer != nullptr, "null utf8 buffer");
335 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
336 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
337 cfs->skip_u1_fast(utf8_length);
338
339 // Before storing the symbol, make sure it's legal
340 if (_need_verify) {
341 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
342 }
343
344 unsigned int hash;
345 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
346 utf8_length,
347 hash);
348 if (result == nullptr) {
349 names[names_count] = (const char*)utf8_buffer;
350 lengths[names_count] = utf8_length;
351 indices[names_count] = index;
352 hashValues[names_count++] = hash;
353 if (names_count == SymbolTable::symbol_alloc_batch_size) {
354 SymbolTable::new_symbols(_loader_data,
355 constantPoolHandle(THREAD, cp),
356 names_count,
357 names,
358 lengths,
359 indices,
360 hashValues);
361 names_count = 0;
362 }
363 } else {
364 cp->symbol_at_put(index, result);
365 }
366 break;
367 }
368 case JVM_CONSTANT_Module:
369 case JVM_CONSTANT_Package: {
370 // Record that an error occurred in these two cases but keep parsing so
371 // that ACC_Module can be checked for in the access_flags. Need to
372 // throw NoClassDefFoundError in that case.
373 if (_major_version >= JAVA_9_VERSION) {
374 cfs->guarantee_more(3, CHECK);
375 cfs->get_u2_fast();
376 set_class_bad_constant_seen(tag);
377 break;
378 }
379 }
380 default: {
381 classfile_parse_error("Unknown constant tag %u in class file %s",
382 tag,
383 THREAD);
384 return;
385 }
386 } // end of switch(tag)
387 } // end of for
388
389 // Allocate the remaining symbols
390 if (names_count > 0) {
391 SymbolTable::new_symbols(_loader_data,
392 constantPoolHandle(THREAD, cp),
393 names_count,
394 names,
395 lengths,
396 indices,
397 hashValues);
398 }
399
400 // Copy _current pointer of local copy back to stream.
401 assert(stream->current() == old_current, "non-exclusive use of stream");
402 stream->set_current(cfs1.current());
403
404 }
405
406 static inline bool valid_cp_range(int index, int length) {
407 return (index > 0 && index < length);
408 }
409
410 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
411 assert(cp != nullptr, "invariant");
412 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
413 return cp->symbol_at(index);
414 }
415 return nullptr;
416 }
417
418 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
419 ConstantPool* const cp,
420 const int length,
421 TRAPS) {
422 assert(cp != nullptr, "invariant");
423 assert(stream != nullptr, "invariant");
424
425 // parsing constant pool entries
426 parse_constant_pool_entries(stream, cp, length, CHECK);
427 if (class_bad_constant_seen() != 0) {
428 // a bad CP entry has been detected previously so stop parsing and just return.
429 return;
430 }
431
432 int index = 1; // declared outside of loops for portability
433 int num_klasses = 0;
434
435 // first verification pass - validate cross references
436 // and fixup class and string constants
437 for (index = 1; index < length; index++) { // Index 0 is unused
438 const jbyte tag = cp->tag_at(index).value();
439 switch (tag) {
440 case JVM_CONSTANT_Class: {
441 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
442 break;
443 }
444 case JVM_CONSTANT_Fieldref:
445 // fall through
446 case JVM_CONSTANT_Methodref:
447 // fall through
448 case JVM_CONSTANT_InterfaceMethodref: {
449 if (!_need_verify) break;
450 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
451 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
452 guarantee_property(valid_klass_reference_at(klass_ref_index),
453 "Invalid constant pool index %u in class file %s",
454 klass_ref_index, CHECK);
455 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
456 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
457 "Invalid constant pool index %u in class file %s",
458 name_and_type_ref_index, CHECK);
459 break;
460 }
461 case JVM_CONSTANT_String: {
462 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
463 break;
464 }
465 case JVM_CONSTANT_Integer:
466 break;
467 case JVM_CONSTANT_Float:
468 break;
469 case JVM_CONSTANT_Long:
470 case JVM_CONSTANT_Double: {
471 index++;
472 guarantee_property(
473 (index < length && cp->tag_at(index).is_invalid()),
474 "Improper constant pool long/double index %u in class file %s",
475 index, CHECK);
476 break;
477 }
478 case JVM_CONSTANT_NameAndType: {
479 if (!_need_verify) break;
480 const int name_ref_index = cp->name_ref_index_at(index);
481 const int signature_ref_index = cp->signature_ref_index_at(index);
482 guarantee_property(valid_symbol_at(name_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 name_ref_index, CHECK);
485 guarantee_property(valid_symbol_at(signature_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 signature_ref_index, CHECK);
488 break;
489 }
490 case JVM_CONSTANT_Utf8:
491 break;
492 case JVM_CONSTANT_UnresolvedClass: // fall-through
493 case JVM_CONSTANT_UnresolvedClassInError: {
494 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
495 break;
496 }
497 case JVM_CONSTANT_ClassIndex: {
498 const int class_index = cp->klass_index_at(index);
499 guarantee_property(valid_symbol_at(class_index),
500 "Invalid constant pool index %u in class file %s",
501 class_index, CHECK);
502
503 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
504 break;
505 }
506 case JVM_CONSTANT_StringIndex: {
507 const int string_index = cp->string_index_at(index);
508 guarantee_property(valid_symbol_at(string_index),
509 "Invalid constant pool index %u in class file %s",
510 string_index, CHECK);
511 Symbol* const sym = cp->symbol_at(string_index);
512 cp->unresolved_string_at_put(index, sym);
513 break;
514 }
515 case JVM_CONSTANT_MethodHandle: {
516 const int ref_index = cp->method_handle_index_at(index);
517 guarantee_property(valid_cp_range(ref_index, length),
518 "Invalid constant pool index %u in class file %s",
519 ref_index, CHECK);
520 const constantTag tag = cp->tag_at(ref_index);
521 const int ref_kind = cp->method_handle_ref_kind_at(index);
522
523 switch (ref_kind) {
524 case JVM_REF_getField:
525 case JVM_REF_getStatic:
526 case JVM_REF_putField:
527 case JVM_REF_putStatic: {
528 guarantee_property(
529 tag.is_field(),
530 "Invalid constant pool index %u in class file %s (not a field)",
531 ref_index, CHECK);
532 break;
533 }
534 case JVM_REF_invokeVirtual:
535 case JVM_REF_newInvokeSpecial: {
536 guarantee_property(
537 tag.is_method(),
538 "Invalid constant pool index %u in class file %s (not a method)",
539 ref_index, CHECK);
540 break;
541 }
542 case JVM_REF_invokeStatic:
543 case JVM_REF_invokeSpecial: {
544 guarantee_property(
545 tag.is_method() ||
546 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
547 "Invalid constant pool index %u in class file %s (not a method)",
548 ref_index, CHECK);
549 break;
550 }
551 case JVM_REF_invokeInterface: {
552 guarantee_property(
553 tag.is_interface_method(),
554 "Invalid constant pool index %u in class file %s (not an interface method)",
555 ref_index, CHECK);
556 break;
557 }
558 default: {
559 classfile_parse_error(
560 "Bad method handle kind at constant pool index %u in class file %s",
561 index, THREAD);
562 return;
563 }
564 } // switch(refkind)
565 // Keep the ref_index unchanged. It will be indirected at link-time.
566 break;
567 } // case MethodHandle
568 case JVM_CONSTANT_MethodType: {
569 const int ref_index = cp->method_type_index_at(index);
570 guarantee_property(valid_symbol_at(ref_index),
571 "Invalid constant pool index %u in class file %s",
572 ref_index, CHECK);
573 break;
574 }
575 case JVM_CONSTANT_Dynamic: {
576 const int name_and_type_ref_index =
577 cp->bootstrap_name_and_type_ref_index_at(index);
578
579 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
580 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
581 "Invalid constant pool index %u in class file %s",
582 name_and_type_ref_index, CHECK);
583 // bootstrap specifier index must be checked later,
584 // when BootstrapMethods attr is available
585
586 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
587 cp->set_has_dynamic_constant();
588 break;
589 }
590 case JVM_CONSTANT_InvokeDynamic: {
591 const int name_and_type_ref_index =
592 cp->bootstrap_name_and_type_ref_index_at(index);
593
594 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
595 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
596 "Invalid constant pool index %u in class file %s",
597 name_and_type_ref_index, CHECK);
598 // bootstrap specifier index must be checked later,
599 // when BootstrapMethods attr is available
600 break;
601 }
602 default: {
603 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
604 ShouldNotReachHere();
605 break;
606 }
607 } // switch(tag)
608 } // end of for
609
610 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
611
612 if (!_need_verify) {
613 return;
614 }
615
616 // second verification pass - checks the strings are of the right format.
617 // but not yet to the other entries
618 for (index = 1; index < length; index++) {
619 const jbyte tag = cp->tag_at(index).value();
620 switch (tag) {
621 case JVM_CONSTANT_UnresolvedClass: {
622 const Symbol* const class_name = cp->klass_name_at(index);
623 // check the name
624 verify_legal_class_name(class_name, CHECK);
625 break;
626 }
627 case JVM_CONSTANT_NameAndType: {
628 if (_need_verify) {
629 const int sig_index = cp->signature_ref_index_at(index);
630 const int name_index = cp->name_ref_index_at(index);
631 const Symbol* const name = cp->symbol_at(name_index);
632 const Symbol* const sig = cp->symbol_at(sig_index);
633 guarantee_property(sig->utf8_length() != 0,
634 "Illegal zero length constant pool entry at %d in class %s",
635 sig_index, CHECK);
636 guarantee_property(name->utf8_length() != 0,
637 "Illegal zero length constant pool entry at %d in class %s",
638 name_index, CHECK);
639
640 if (Signature::is_method(sig)) {
641 // Format check method name and signature
642 verify_legal_method_name(name, CHECK);
643 verify_legal_method_signature(name, sig, CHECK);
644 } else {
645 // Format check field name and signature
646 verify_legal_field_name(name, CHECK);
647 verify_legal_field_signature(name, sig, CHECK);
648 }
649 }
650 break;
651 }
652 case JVM_CONSTANT_Dynamic: {
653 const int name_and_type_ref_index =
654 cp->uncached_name_and_type_ref_index_at(index);
655 // already verified to be utf8
656 const int name_ref_index =
657 cp->name_ref_index_at(name_and_type_ref_index);
658 // already verified to be utf8
659 const int signature_ref_index =
660 cp->signature_ref_index_at(name_and_type_ref_index);
661 const Symbol* const name = cp->symbol_at(name_ref_index);
662 const Symbol* const signature = cp->symbol_at(signature_ref_index);
663 if (_need_verify) {
664 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
665 // Need only to be sure signature is the right type.
666 if (Signature::is_method(signature)) {
667 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
668 }
669 }
670 break;
671 }
672 case JVM_CONSTANT_InvokeDynamic:
673 case JVM_CONSTANT_Fieldref:
674 case JVM_CONSTANT_Methodref:
675 case JVM_CONSTANT_InterfaceMethodref: {
676 const int name_and_type_ref_index =
677 cp->uncached_name_and_type_ref_index_at(index);
678 // already verified to be utf8
679 const int name_ref_index =
680 cp->name_ref_index_at(name_and_type_ref_index);
681 // already verified to be utf8
682 const int signature_ref_index =
683 cp->signature_ref_index_at(name_and_type_ref_index);
684 const Symbol* const name = cp->symbol_at(name_ref_index);
685 const Symbol* const signature = cp->symbol_at(signature_ref_index);
686 if (tag == JVM_CONSTANT_Fieldref) {
687 if (_need_verify) {
688 // Field name and signature are verified above, when iterating NameAndType_info.
689 // Need only to be sure signature is non-zero length and the right type.
690 if (Signature::is_method(signature)) {
691 throwIllegalSignature("Field", name, signature, CHECK);
692 }
693 }
694 } else {
695 if (_need_verify) {
696 // Method name and signature are individually verified above, when iterating
697 // NameAndType_info. Need to check here that signature is non-zero length and
698 // the right type.
699 if (!Signature::is_method(signature)) {
700 throwIllegalSignature("Method", name, signature, CHECK);
701 }
702 }
703 // If a class method name begins with '<', it must be "<init>" and have void signature.
704 const unsigned int name_len = name->utf8_length();
705 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
706 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
707 if (name != vmSymbols::object_initializer_name()) {
708 classfile_parse_error(
709 "Bad method name at constant pool index %u in class file %s",
710 name_ref_index, THREAD);
711 return;
712 } else if (!Signature::is_void_method(signature)) { // must have void signature.
713 throwIllegalSignature("Method", name, signature, CHECK);
714 }
715 }
716 }
717 break;
718 }
719 case JVM_CONSTANT_MethodHandle: {
720 const int ref_index = cp->method_handle_index_at(index);
721 const int ref_kind = cp->method_handle_ref_kind_at(index);
722 switch (ref_kind) {
723 case JVM_REF_invokeVirtual:
724 case JVM_REF_invokeStatic:
725 case JVM_REF_invokeSpecial:
726 case JVM_REF_newInvokeSpecial: {
727 const int name_and_type_ref_index =
728 cp->uncached_name_and_type_ref_index_at(ref_index);
729 const int name_ref_index =
730 cp->name_ref_index_at(name_and_type_ref_index);
731 const Symbol* const name = cp->symbol_at(name_ref_index);
732 if (ref_kind == JVM_REF_newInvokeSpecial) {
733 if (name != vmSymbols::object_initializer_name()) {
734 classfile_parse_error(
735 "Bad constructor name at constant pool index %u in class file %s",
736 name_ref_index, THREAD);
737 return;
738 }
739 } else {
740 if (name == vmSymbols::object_initializer_name()) {
741 classfile_parse_error(
742 "Bad method name at constant pool index %u in class file %s",
743 name_ref_index, THREAD);
744 return;
745 }
746 }
747 break;
748 }
749 // Other ref_kinds are already fully checked in previous pass.
750 } // switch(ref_kind)
751 break;
752 }
753 case JVM_CONSTANT_MethodType: {
754 const Symbol* const no_name = vmSymbols::type_name(); // place holder
755 const Symbol* const signature = cp->method_type_signature_at(index);
756 verify_legal_method_signature(no_name, signature, CHECK);
757 break;
758 }
759 case JVM_CONSTANT_Utf8: {
760 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
761 }
762 } // switch(tag)
763 } // end of for
764 }
765
766 class NameSigHash: public ResourceObj {
767 public:
768 const Symbol* _name; // name
769 const Symbol* _sig; // signature
770
771 static const int HASH_ROW_SIZE = 256;
772
773 NameSigHash(Symbol* name, Symbol* sig) :
774 _name(name),
775 _sig(sig) {}
776
777 static unsigned int hash(NameSigHash const& namesig) {
778 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
779 }
780
781 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
782 return (e0._name == e1._name) &&
783 (e0._sig == e1._sig);
784 }
785 };
786
787 using NameSigHashtable = HashTable<NameSigHash, int,
788 NameSigHash::HASH_ROW_SIZE,
789 AnyObj::RESOURCE_AREA, mtInternal,
790 &NameSigHash::hash, &NameSigHash::equals>;
791
792 // Side-effects: populates the _local_interfaces field
793 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
794 const int itfs_len,
795 ConstantPool* const cp,
796 bool* const has_nonstatic_concrete_methods,
797 TRAPS) {
798 assert(stream != nullptr, "invariant");
799 assert(cp != nullptr, "invariant");
800 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
801
802 if (itfs_len == 0) {
803 _local_interfaces = Universe::the_empty_instance_klass_array();
804 } else {
805 assert(itfs_len > 0, "only called for len>0");
806 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
807
808 int index;
809 for (index = 0; index < itfs_len; index++) {
810 const u2 interface_index = stream->get_u2(CHECK);
811 Klass* interf;
812 guarantee_property(
813 valid_klass_reference_at(interface_index),
814 "Interface name has bad constant pool index %u in class file %s",
815 interface_index, CHECK);
816 if (cp->tag_at(interface_index).is_klass()) {
817 interf = cp->resolved_klass_at(interface_index);
818 } else {
819 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
820
821 // Don't need to check legal name because it's checked when parsing constant pool.
822 // But need to make sure it's not an array type.
823 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
824 "Bad interface name in class file %s", CHECK);
825
826 // Call resolve on the interface class name with class circularity checking
827 interf = SystemDictionary::resolve_super_or_fail(_class_name,
828 unresolved_klass,
829 Handle(THREAD, _loader_data->class_loader()),
830 false, CHECK);
831 }
832
833 if (!interf->is_interface()) {
834 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
835 err_msg("class %s can not implement %s, because it is not an interface (%s)",
836 _class_name->as_klass_external_name(),
837 interf->external_name(),
838 interf->class_in_module_of_loader()));
839 }
840
841 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
842 *has_nonstatic_concrete_methods = true;
843 }
844 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
845 }
846
847 if (!_need_verify || itfs_len <= 1) {
848 return;
849 }
850
851 // Check if there's any duplicates in interfaces
852 ResourceMark rm(THREAD);
853 // Set containing interface names
854 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
855 for (index = 0; index < itfs_len; index++) {
856 const InstanceKlass* const k = _local_interfaces->at(index);
857 Symbol* interface_name = k->name();
858 // If no duplicates, add (name, nullptr) in hashtable interface_names.
859 if (!interface_names->put(interface_name, 0)) {
860 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
861 interface_name->as_C_string(), THREAD);
862 return;
863 }
864 }
865 }
866 }
867
868 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
869 int constantvalue_index,
870 int signature_index,
871 TRAPS) const {
872 // Make sure the constant pool entry is of a type appropriate to this field
873 guarantee_property(
874 (constantvalue_index > 0 &&
875 constantvalue_index < cp->length()),
876 "Bad initial value index %u in ConstantValue attribute in class file %s",
877 constantvalue_index, CHECK);
878
879 const constantTag value_type = cp->tag_at(constantvalue_index);
880 switch(cp->basic_type_for_signature_at(signature_index)) {
881 case T_LONG: {
882 guarantee_property(value_type.is_long(),
883 "Inconsistent constant value type in class file %s",
884 CHECK);
885 break;
886 }
887 case T_FLOAT: {
888 guarantee_property(value_type.is_float(),
889 "Inconsistent constant value type in class file %s",
890 CHECK);
891 break;
892 }
893 case T_DOUBLE: {
894 guarantee_property(value_type.is_double(),
895 "Inconsistent constant value type in class file %s",
896 CHECK);
897 break;
898 }
899 case T_BYTE:
900 case T_CHAR:
901 case T_SHORT:
902 case T_BOOLEAN:
903 case T_INT: {
904 guarantee_property(value_type.is_int(),
905 "Inconsistent constant value type in class file %s",
906 CHECK);
907 break;
908 }
909 case T_OBJECT: {
910 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
911 && value_type.is_string()),
912 "Bad string initial value in class file %s",
913 CHECK);
914 break;
915 }
916 default: {
917 classfile_parse_error("Unable to set initial value %u in class file %s",
918 constantvalue_index,
919 THREAD);
920 }
921 }
922 }
923
924 class AnnotationCollector : public ResourceObj{
925 public:
926 enum Location { _in_field, _in_method, _in_class };
927 enum ID {
928 _unknown = 0,
929 _method_CallerSensitive,
930 _method_ForceInline,
931 _method_DontInline,
932 _method_ChangesCurrentThread,
933 _method_JvmtiHideEvents,
934 _method_JvmtiMountTransition,
935 _method_InjectedProfile,
936 _method_LambdaForm_Compiled,
937 _method_Hidden,
938 _method_Scoped,
939 _method_IntrinsicCandidate,
940 _jdk_internal_vm_annotation_Contended,
941 _field_Stable,
942 _jdk_internal_vm_annotation_ReservedStackAccess,
943 _jdk_internal_ValueBased,
944 _jdk_internal_LooselyConsistentValue,
945 _jdk_internal_NullRestricted,
946 _java_lang_Deprecated,
947 _java_lang_Deprecated_for_removal,
948 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
949 _method_AOTRuntimeSetup,
950 _jdk_internal_vm_annotation_TrustFinalFields,
951 _annotation_LIMIT
952 };
953 const Location _location;
954 int _annotations_present;
955 u2 _contended_group;
956
957 AnnotationCollector(Location location)
958 : _location(location), _annotations_present(0), _contended_group(0)
959 {
960 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
961 }
962 // If this annotation name has an ID, report it (or _none).
963 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
964 // Set the annotation name:
965 void set_annotation(ID id) {
966 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
967 _annotations_present |= (int)nth_bit((int)id);
968 }
969
970 void remove_annotation(ID id) {
971 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
972 _annotations_present &= (int)~nth_bit((int)id);
973 }
974
975 // Report if the annotation is present.
976 bool has_any_annotations() const { return _annotations_present != 0; }
977 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
978
979 void set_contended_group(u2 group) { _contended_group = group; }
980 u2 contended_group() const { return _contended_group; }
981
982 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
983
984 void set_stable(bool stable) { set_annotation(_field_Stable); }
985 bool is_stable() const { return has_annotation(_field_Stable); }
986
987 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); }
988 };
989
990 // This class also doubles as a holder for metadata cleanup.
991 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
992 private:
993 ClassLoaderData* _loader_data;
994 AnnotationArray* _field_annotations;
995 AnnotationArray* _field_type_annotations;
996 public:
997 FieldAnnotationCollector(ClassLoaderData* loader_data) :
998 AnnotationCollector(_in_field),
999 _loader_data(loader_data),
1000 _field_annotations(nullptr),
1001 _field_type_annotations(nullptr) {}
1002 ~FieldAnnotationCollector();
1003 void apply_to(FieldInfo* f);
1004 AnnotationArray* field_annotations() { return _field_annotations; }
1005 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1006
1007 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1008 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1009 };
1010
1011 class MethodAnnotationCollector : public AnnotationCollector{
1012 public:
1013 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1014 void apply_to(const methodHandle& m);
1015 };
1016
1017 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1018 public:
1019 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1020 void apply_to(InstanceKlass* ik);
1021 };
1022
1023
1024 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth); // fwd decl
1025 static const int max_recursion_depth = 5;
1026
1027 // Safely increment index by val if does not pass limit
1028 #define SAFE_ADD(index, limit, val) \
1029 if (index >= limit - val) return limit; \
1030 index += val;
1031
1032 // Skip an annotation. Return >=limit if there is any problem.
1033 static int skip_annotation(const u1* buffer, int limit, int index, int recursion_depth = 0) {
1034 assert(buffer != nullptr, "invariant");
1035 if (recursion_depth > max_recursion_depth) {
1036 return limit;
1037 }
1038 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1039 // value := switch (tag:u1) { ... }
1040 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1041 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1042 while (--nmem >= 0 && index < limit) {
1043 SAFE_ADD(index, limit, 2); // skip member
1044 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1045 }
1046 return index;
1047 }
1048
1049 // Skip an annotation value. Return >=limit if there is any problem.
1050 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth) {
1051 assert(buffer != nullptr, "invariant");
1052
1053 if (recursion_depth > max_recursion_depth) {
1054 return limit;
1055 }
1056 // value := switch (tag:u1) {
1057 // case B, C, I, S, Z, D, F, J, c: con:u2;
1058 // case e: e_class:u2 e_name:u2;
1059 // case s: s_con:u2;
1060 // case [: do(nval:u2) {value};
1061 // case @: annotation;
1062 // case s: s_con:u2;
1063 // }
1064 SAFE_ADD(index, limit, 1); // read tag
1065 const u1 tag = buffer[index - 1];
1066 switch (tag) {
1067 case 'B':
1068 case 'C':
1069 case 'I':
1070 case 'S':
1071 case 'Z':
1072 case 'D':
1073 case 'F':
1074 case 'J':
1075 case 'c':
1076 case 's':
1077 SAFE_ADD(index, limit, 2); // skip con or s_con
1078 break;
1079 case 'e':
1080 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1081 break;
1082 case '[':
1083 {
1084 SAFE_ADD(index, limit, 2); // read nval
1085 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1086 while (--nval >= 0 && index < limit) {
1087 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1088 }
1089 }
1090 break;
1091 case '@':
1092 index = skip_annotation(buffer, limit, index, recursion_depth + 1);
1093 break;
1094 default:
1095 return limit; // bad tag byte
1096 }
1097 return index;
1098 }
1099
1100 // Sift through annotations, looking for those significant to the VM:
1101 static void parse_annotations(const ConstantPool* const cp,
1102 const u1* buffer, int limit,
1103 AnnotationCollector* coll,
1104 ClassLoaderData* loader_data,
1105 const bool can_access_vm_annotations) {
1106
1107 assert(cp != nullptr, "invariant");
1108 assert(buffer != nullptr, "invariant");
1109 assert(coll != nullptr, "invariant");
1110 assert(loader_data != nullptr, "invariant");
1111
1112 // annotations := do(nann:u2) {annotation}
1113 int index = 2; // read nann
1114 if (index >= limit) return;
1115 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1116 enum { // initial annotation layout
1117 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1118 count_off = 2, // u2 such as 1 (one value)
1119 member_off = 4, // utf8 such as 'value'
1120 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1121 e_tag_val = 'e',
1122 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1123 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1124 e_size = 11, // end of 'e' annotation
1125 c_tag_val = 'c', // payload is type
1126 c_con_off = 7, // utf8 payload, such as 'I'
1127 c_size = 9, // end of 'c' annotation
1128 s_tag_val = 's', // payload is String
1129 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1130 s_size = 9,
1131 b_tag_val = 'Z', // payload is boolean
1132 min_size = 6 // smallest possible size (zero members)
1133 };
1134 // Cannot add min_size to index in case of overflow MAX_INT
1135 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1136 int index0 = index;
1137 index = skip_annotation(buffer, limit, index);
1138 const u1* const abase = buffer + index0;
1139 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1140 const int count = Bytes::get_Java_u2((address)abase + count_off);
1141 const Symbol* const aname = check_symbol_at(cp, atype);
1142 if (aname == nullptr) break; // invalid annotation name
1143 const Symbol* member = nullptr;
1144 if (count >= 1) {
1145 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1146 member = check_symbol_at(cp, member_index);
1147 if (member == nullptr) break; // invalid member name
1148 }
1149
1150 // Here is where parsing particular annotations will take place.
1151 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1152 if (AnnotationCollector::_unknown == id) continue;
1153 coll->set_annotation(id);
1154 if (AnnotationCollector::_java_lang_Deprecated == id) {
1155 // @Deprecated can specify forRemoval=true, which we need
1156 // to record for JFR to use. If the annotation is not well-formed
1157 // then we may not be able to determine that.
1158 const u1* offset = abase + member_off;
1159 // There are only 2 members in @Deprecated.
1160 int n_members = MIN2(count, 2);
1161 for (int i = 0; i < n_members; ++i) {
1162 int member_index = Bytes::get_Java_u2((address)offset);
1163 offset += 2;
1164 member = check_symbol_at(cp, member_index);
1165 if (member == vmSymbols::since() &&
1166 (*((address)offset) == s_tag_val)) {
1167 // Found `since` first so skip over it
1168 offset += 3;
1169 }
1170 else if (member == vmSymbols::for_removal() &&
1171 (*((address)offset) == b_tag_val)) {
1172 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1173 // No guarantee the entry is valid so check it refers to an int in the CP.
1174 if (cp->is_within_bounds(boolean_value_index) &&
1175 cp->tag_at(boolean_value_index).is_int() &&
1176 cp->int_at(boolean_value_index) == 1) {
1177 // forRemoval == true
1178 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1179 }
1180 break; // no need to check further
1181 }
1182 else {
1183 // This @Deprecated annotation is malformed so we don't try to
1184 // determine whether forRemoval is set.
1185 break;
1186 }
1187 }
1188 continue; // proceed to next annotation
1189 }
1190
1191 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1192 // @Contended can optionally specify the contention group.
1193 //
1194 // Contended group defines the equivalence class over the fields:
1195 // the fields within the same contended group are not treated distinct.
1196 // The only exception is default group, which does not incur the
1197 // equivalence. Naturally, contention group for classes is meaningless.
1198 //
1199 // While the contention group is specified as String, annotation
1200 // values are already interned, and we might as well use the constant
1201 // pool index as the group tag.
1202 //
1203 u2 group_index = 0; // default contended group
1204 if (count == 1
1205 && s_size == (index - index0) // match size
1206 && s_tag_val == *(abase + tag_off)
1207 && member == vmSymbols::value_name()) {
1208 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1209 // No guarantee the group_index is valid so check it refers to a
1210 // symbol in the CP.
1211 if (cp->is_within_bounds(group_index) &&
1212 cp->tag_at(group_index).is_utf8()) {
1213 // Seems valid, so check for empty string and reset
1214 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1215 group_index = 0; // default contended group
1216 }
1217 } else {
1218 // Not valid so use the default
1219 group_index = 0;
1220 }
1221 }
1222 coll->set_contended_group(group_index);
1223 continue; // proceed to next annotation
1224 }
1225 }
1226 }
1227
1228
1229 // Parse attributes for a field.
1230 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1231 u2 attributes_count,
1232 bool is_static, u2 signature_index,
1233 u2* const constantvalue_index_addr,
1234 bool* const is_synthetic_addr,
1235 u2* const generic_signature_index_addr,
1236 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1237 TRAPS) {
1238 assert(cfs != nullptr, "invariant");
1239 assert(constantvalue_index_addr != nullptr, "invariant");
1240 assert(is_synthetic_addr != nullptr, "invariant");
1241 assert(generic_signature_index_addr != nullptr, "invariant");
1242 assert(parsed_annotations != nullptr, "invariant");
1243 assert(attributes_count > 0, "attributes_count should be greater than 0");
1244
1245 u2 constantvalue_index = 0;
1246 u2 generic_signature_index = 0;
1247 bool is_synthetic = false;
1248 const u1* runtime_visible_annotations = nullptr;
1249 int runtime_visible_annotations_length = 0;
1250 const u1* runtime_visible_type_annotations = nullptr;
1251 int runtime_visible_type_annotations_length = 0;
1252 bool runtime_invisible_annotations_exists = false;
1253 bool runtime_invisible_type_annotations_exists = false;
1254 const ConstantPool* const cp = _cp;
1255
1256 while (attributes_count--) {
1257 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1258 const u2 attribute_name_index = cfs->get_u2_fast();
1259 const u4 attribute_length = cfs->get_u4_fast();
1260 guarantee_property(valid_symbol_at(attribute_name_index),
1261 "Invalid field attribute index %u in class file %s",
1262 attribute_name_index,
1263 CHECK);
1264
1265 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1266 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1267 // ignore if non-static
1268 if (constantvalue_index != 0) {
1269 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1270 return;
1271 }
1272 guarantee_property(
1273 attribute_length == 2,
1274 "Invalid ConstantValue field attribute length %u in class file %s",
1275 attribute_length, CHECK);
1276
1277 constantvalue_index = cfs->get_u2(CHECK);
1278 if (_need_verify) {
1279 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1280 }
1281 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1282 if (attribute_length != 0) {
1283 classfile_parse_error(
1284 "Invalid Synthetic field attribute length %u in class file %s",
1285 attribute_length, THREAD);
1286 return;
1287 }
1288 is_synthetic = true;
1289 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1290 if (attribute_length != 0) {
1291 classfile_parse_error(
1292 "Invalid Deprecated field attribute length %u in class file %s",
1293 attribute_length, THREAD);
1294 return;
1295 }
1296 } else if (_major_version >= JAVA_1_5_VERSION) {
1297 if (attribute_name == vmSymbols::tag_signature()) {
1298 if (generic_signature_index != 0) {
1299 classfile_parse_error(
1300 "Multiple Signature attributes for field in class file %s", THREAD);
1301 return;
1302 }
1303 if (attribute_length != 2) {
1304 classfile_parse_error(
1305 "Wrong size %u for field's Signature attribute in class file %s",
1306 attribute_length, THREAD);
1307 return;
1308 }
1309 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1310 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1311 if (runtime_visible_annotations != nullptr) {
1312 classfile_parse_error(
1313 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1314 return;
1315 }
1316 runtime_visible_annotations_length = attribute_length;
1317 runtime_visible_annotations = cfs->current();
1318 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1319 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1320 parse_annotations(cp,
1321 runtime_visible_annotations,
1322 runtime_visible_annotations_length,
1323 parsed_annotations,
1324 _loader_data,
1325 _can_access_vm_annotations);
1326 cfs->skip_u1_fast(runtime_visible_annotations_length);
1327 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1328 if (runtime_invisible_annotations_exists) {
1329 classfile_parse_error(
1330 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1331 return;
1332 }
1333 runtime_invisible_annotations_exists = true;
1334 cfs->skip_u1(attribute_length, CHECK);
1335 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1336 if (runtime_visible_type_annotations != nullptr) {
1337 classfile_parse_error(
1338 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1339 return;
1340 }
1341 runtime_visible_type_annotations_length = attribute_length;
1342 runtime_visible_type_annotations = cfs->current();
1343 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1344 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1345 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1346 if (runtime_invisible_type_annotations_exists) {
1347 classfile_parse_error(
1348 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1349 return;
1350 } else {
1351 runtime_invisible_type_annotations_exists = true;
1352 }
1353 cfs->skip_u1(attribute_length, CHECK);
1354 } else {
1355 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1356 }
1357 } else {
1358 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1359 }
1360 }
1361
1362 *constantvalue_index_addr = constantvalue_index;
1363 *is_synthetic_addr = is_synthetic;
1364 *generic_signature_index_addr = generic_signature_index;
1365 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1366 runtime_visible_annotations_length,
1367 CHECK);
1368 parsed_annotations->set_field_annotations(a);
1369 a = allocate_annotations(runtime_visible_type_annotations,
1370 runtime_visible_type_annotations_length,
1371 CHECK);
1372 parsed_annotations->set_field_type_annotations(a);
1373 return;
1374 }
1375
1376
1377 // Side-effects: populates the _fields, _fields_annotations,
1378 // _fields_type_annotations fields
1379 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1380 AccessFlags class_access_flags,
1381 ConstantPool* cp,
1382 const int cp_size,
1383 u2* const java_fields_count_ptr,
1384 TRAPS) {
1385
1386 assert(cfs != nullptr, "invariant");
1387 assert(cp != nullptr, "invariant");
1388 assert(java_fields_count_ptr != nullptr, "invariant");
1389
1390 assert(nullptr == _fields_annotations, "invariant");
1391 assert(nullptr == _fields_type_annotations, "invariant");
1392
1393 // "inline type" means concrete value class
1394 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1395 // "value class" can be either abstract or concrete value class
1396 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1397 cfs->guarantee_more(2, CHECK); // length
1398 const u2 length = cfs->get_u2_fast();
1399 *java_fields_count_ptr = length;
1400
1401 int num_injected = 0;
1402 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1403 &num_injected);
1404
1405 // Two more slots are required for inline classes:
1406 // - The static field ".null_reset" which carries the nullable flat layout
1407 // representation of null, added below
1408 // - The nonstatic field ".empty" the JVM injects when detecting an empty
1409 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout
1410 // One more slot is required for both abstract value class and inline classes:
1411 // - The static field ".acmp_maps" for acmp and identity hash, tracks
1412 // nonstatic fields both inherited or declared, added below
1413 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1414 + (is_value_class ? 1 : 0);
1415
1416 // Allocate a temporary resource array to collect field data.
1417 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1418 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1419
1420 ResourceMark rm(THREAD);
1421 for (int n = 0; n < length; n++) {
1422 // access_flags, name_index, descriptor_index, attributes_count
1423 cfs->guarantee_more(8, CHECK);
1424
1425 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1426 if (!supports_inline_types()) {
1427 recognized_modifiers &= ~JVM_ACC_STRICT_INIT;
1428 }
1429
1430 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1431 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1432 AccessFlags access_flags;
1433 access_flags.set_flags(flags);
1434 FieldInfo::FieldFlags fieldFlags(0);
1435
1436 const u2 name_index = cfs->get_u2_fast();
1437 guarantee_property(valid_symbol_at(name_index),
1438 "Invalid constant pool index %u for field name in class file %s",
1439 name_index, CHECK);
1440 const Symbol* const name = cp->symbol_at(name_index);
1441 verify_legal_field_name(name, CHECK);
1442
1443 const u2 signature_index = cfs->get_u2_fast();
1444 guarantee_property(valid_symbol_at(signature_index),
1445 "Invalid constant pool index %u for field signature in class file %s",
1446 signature_index, CHECK);
1447 const Symbol* const sig = cp->symbol_at(signature_index);
1448 verify_legal_field_signature(name, sig, CHECK);
1449
1450 u2 constantvalue_index = 0;
1451 bool is_synthetic = false;
1452 u2 generic_signature_index = 0;
1453 const bool is_static = access_flags.is_static();
1454 FieldAnnotationCollector parsed_annotations(_loader_data);
1455
1456 bool is_null_restricted = false;
1457
1458 const u2 attributes_count = cfs->get_u2_fast();
1459 if (attributes_count > 0) {
1460 parse_field_attributes(cfs,
1461 attributes_count,
1462 is_static,
1463 signature_index,
1464 &constantvalue_index,
1465 &is_synthetic,
1466 &generic_signature_index,
1467 &parsed_annotations,
1468 CHECK);
1469
1470 if (parsed_annotations.field_annotations() != nullptr) {
1471 if (_fields_annotations == nullptr) {
1472 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1473 _loader_data, length, nullptr,
1474 CHECK);
1475 }
1476 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1477 parsed_annotations.set_field_annotations(nullptr);
1478 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1479 if (!Signature::has_envelope(sig)) {
1480 Exceptions::fthrow(
1481 THREAD_AND_LOCATION,
1482 vmSymbols::java_lang_ClassFormatError(),
1483 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1484 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1485 return;
1486 }
1487 if (!supports_inline_types()) {
1488 Exceptions::fthrow(
1489 THREAD_AND_LOCATION,
1490 vmSymbols::java_lang_ClassFormatError(),
1491 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file",
1492 class_name()->as_C_string(), name->as_C_string());
1493 return;
1494 }
1495
1496 if ((flags & JVM_ACC_STRICT_INIT) == 0) {
1497 // Inject STRICT_INIT and validate in context
1498 const jint patched_flags = flags | JVM_ACC_STRICT_INIT;
1499 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK);
1500 access_flags.set_flags(patched_flags);
1501 }
1502 is_null_restricted = true;
1503 }
1504 }
1505 if (parsed_annotations.field_type_annotations() != nullptr) {
1506 if (_fields_type_annotations == nullptr) {
1507 _fields_type_annotations =
1508 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1509 length,
1510 nullptr,
1511 CHECK);
1512 }
1513 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1514 parsed_annotations.set_field_type_annotations(nullptr);
1515 }
1516
1517 if (is_synthetic) {
1518 access_flags.set_is_synthetic();
1519 }
1520 if (generic_signature_index != 0) {
1521 fieldFlags.update_generic(true);
1522 }
1523 }
1524
1525 if (is_null_restricted) {
1526 fieldFlags.update_null_free_inline_type(true);
1527 }
1528
1529 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1530
1531 // Update number of static oop fields.
1532 if (is_static && is_reference_type(type)) {
1533 _static_oop_count++;
1534 }
1535
1536 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1537 fi.set_index(n);
1538 if (fieldFlags.is_generic()) {
1539 fi.set_generic_signature_index(generic_signature_index);
1540 }
1541 parsed_annotations.apply_to(&fi);
1542 if (fi.field_flags().is_contended()) {
1543 _has_contended_fields = true;
1544 }
1545 if (access_flags.is_strict() && access_flags.is_static()) {
1546 _has_strict_static_fields = true;
1547 }
1548 _temp_field_info->append(fi);
1549 }
1550 assert(_temp_field_info->length() == length, "Must be");
1551
1552 if (num_injected != 0) {
1553 for (int n = 0; n < num_injected; n++) {
1554 // Check for duplicates
1555 if (injected[n].may_be_java) {
1556 const Symbol* const name = injected[n].name();
1557 const Symbol* const signature = injected[n].signature();
1558 bool duplicate = false;
1559 for (int i = 0; i < length; i++) {
1560 const FieldInfo* const f = _temp_field_info->adr_at(i);
1561 if (name == cp->symbol_at(f->name_index()) &&
1562 signature == cp->symbol_at(f->signature_index())) {
1563 // Symbol is desclared in Java so skip this one
1564 duplicate = true;
1565 break;
1566 }
1567 }
1568 if (duplicate) {
1569 // These will be removed from the field array at the end
1570 continue;
1571 }
1572 }
1573
1574 // Injected field
1575 FieldInfo::FieldFlags fflags(0);
1576 fflags.update_injected(true);
1577 AccessFlags aflags;
1578 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1579 int idx = _temp_field_info->append(fi);
1580 _temp_field_info->adr_at(idx)->set_index(idx);
1581 }
1582 }
1583
1584 if (is_inline_type) {
1585 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1586 // It should never be seen by user code, it is used when writing "null" to a nullable flat field
1587 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1588 // alive.
1589 FieldInfo::FieldFlags fflags2(0);
1590 fflags2.update_injected(true);
1591 AccessFlags aflags2(JVM_ACC_STATIC);
1592 FieldInfo fi2(aflags2,
1593 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1594 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1595 0,
1596 fflags2);
1597 int idx2 = _temp_field_info->append(fi2);
1598 _temp_field_info->adr_at(idx2)->set_index(idx2);
1599 _static_oop_count++;
1600 }
1601 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1602 && _class_name != vmSymbols::java_lang_Object()) {
1603 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1604 FieldInfo::FieldFlags fflags2(0);
1605 fflags2.update_injected(true);
1606 fflags2.update_stable(true);
1607 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1608 FieldInfo fi3(aflags2,
1609 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1610 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1611 0,
1612 fflags2);
1613 int idx2 = _temp_field_info->append(fi3);
1614 _temp_field_info->adr_at(idx2)->set_index(idx2);
1615 _static_oop_count++;
1616 }
1617
1618 if (_need_verify && length > 1) {
1619 // Check duplicated fields
1620 ResourceMark rm(THREAD);
1621 // Set containing name-signature pairs
1622 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1623 for (int i = 0; i < _temp_field_info->length(); i++) {
1624 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1625 _temp_field_info->adr_at(i)->signature(_cp));
1626 // If no duplicates, add name/signature in hashtable names_and_sigs.
1627 if(!names_and_sigs->put(name_and_sig, 0)) {
1628 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1629 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1630 return;
1631 }
1632 }
1633 }
1634 }
1635
1636
1637 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1638 u4 code_length,
1639 u4 exception_table_length,
1640 TRAPS) {
1641 assert(cfs != nullptr, "invariant");
1642
1643 const unsafe_u2* const exception_table_start = cfs->current();
1644 assert(exception_table_start != nullptr, "null exception table");
1645
1646 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1647 // end_pc,
1648 // handler_pc,
1649 // catch_type_index
1650
1651 // Will check legal target after parsing code array in verifier.
1652 if (_need_verify) {
1653 for (unsigned int i = 0; i < exception_table_length; i++) {
1654 const u2 start_pc = cfs->get_u2_fast();
1655 const u2 end_pc = cfs->get_u2_fast();
1656 const u2 handler_pc = cfs->get_u2_fast();
1657 const u2 catch_type_index = cfs->get_u2_fast();
1658 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1659 "Illegal exception table range in class file %s",
1660 CHECK_NULL);
1661 guarantee_property(handler_pc < code_length,
1662 "Illegal exception table handler in class file %s",
1663 CHECK_NULL);
1664 if (catch_type_index != 0) {
1665 guarantee_property(valid_klass_reference_at(catch_type_index),
1666 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1667 }
1668 }
1669 } else {
1670 cfs->skip_u2_fast(exception_table_length * 4);
1671 }
1672 return exception_table_start;
1673 }
1674
1675 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1676 u4 code_length,
1677 CompressedLineNumberWriteStream**const write_stream,
1678 TRAPS) {
1679
1680 const ClassFileStream* const cfs = _stream;
1681 unsigned int num_entries = cfs->get_u2(CHECK);
1682
1683 // Each entry is a u2 start_pc, and a u2 line_number
1684 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1685
1686 // Verify line number attribute and table length
1687 guarantee_property(
1688 code_attribute_length == sizeof(u2) + length_in_bytes,
1689 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1690
1691 cfs->guarantee_more(length_in_bytes, CHECK);
1692
1693 if ((*write_stream) == nullptr) {
1694 if (length_in_bytes > fixed_buffer_size) {
1695 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1696 } else {
1697 (*write_stream) = new CompressedLineNumberWriteStream(
1698 _linenumbertable_buffer, fixed_buffer_size);
1699 }
1700 }
1701
1702 while (num_entries-- > 0) {
1703 const u2 bci = cfs->get_u2_fast(); // start_pc
1704 const u2 line = cfs->get_u2_fast(); // line_number
1705 guarantee_property(bci < code_length,
1706 "Invalid pc in LineNumberTable in class file %s", CHECK);
1707 (*write_stream)->write_pair(bci, line);
1708 }
1709 }
1710
1711
1712 class LVT_Hash : public AllStatic {
1713 public:
1714
1715 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1716 /*
1717 * 3-tuple start_bci/length/slot has to be unique key,
1718 * so the following comparison seems to be redundant:
1719 * && elem->name_cp_index == entry->_elem->name_cp_index
1720 */
1721 return (e0.start_bci == e1.start_bci &&
1722 e0.length == e1.length &&
1723 e0.name_cp_index == e1.name_cp_index &&
1724 e0.slot == e1.slot);
1725 }
1726
1727 static unsigned int hash(LocalVariableTableElement const& e0) {
1728 unsigned int raw_hash = e0.start_bci;
1729
1730 raw_hash = e0.length + raw_hash * 37;
1731 raw_hash = e0.name_cp_index + raw_hash * 37;
1732 raw_hash = e0.slot + raw_hash * 37;
1733
1734 return raw_hash;
1735 }
1736 };
1737
1738
1739 // Class file LocalVariableTable elements.
1740 class Classfile_LVT_Element {
1741 public:
1742 u2 start_bci;
1743 u2 length;
1744 u2 name_cp_index;
1745 u2 descriptor_cp_index;
1746 u2 slot;
1747 };
1748
1749 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1750 LocalVariableTableElement* const lvt) {
1751 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1752 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1753 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1754 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1755 lvt->signature_cp_index = 0;
1756 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1757 }
1758
1759 // Function is used to parse both attributes:
1760 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1761 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1762 u4 code_length,
1763 u2 max_locals,
1764 u4 code_attribute_length,
1765 u2* const localvariable_table_length,
1766 bool isLVTT,
1767 TRAPS) {
1768 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1769 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1770 const unsigned int size = checked_cast<unsigned>(
1771 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1772
1773 const ConstantPool* const cp = _cp;
1774
1775 // Verify local variable table attribute has right length
1776 if (_need_verify) {
1777 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1778 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1779 }
1780
1781 const unsafe_u2* const localvariable_table_start = cfs->current();
1782 assert(localvariable_table_start != nullptr, "null local variable table");
1783 if (!_need_verify) {
1784 cfs->skip_u2_fast(size);
1785 } else {
1786 cfs->guarantee_more(size * 2, CHECK_NULL);
1787 for(int i = 0; i < (*localvariable_table_length); i++) {
1788 const u2 start_pc = cfs->get_u2_fast();
1789 const u2 length = cfs->get_u2_fast();
1790 const u2 name_index = cfs->get_u2_fast();
1791 const u2 descriptor_index = cfs->get_u2_fast();
1792 const u2 index = cfs->get_u2_fast();
1793 // Assign to a u4 to avoid overflow
1794 const u4 end_pc = (u4)start_pc + (u4)length;
1795
1796 if (start_pc >= code_length) {
1797 classfile_parse_error(
1798 "Invalid start_pc %u in %s in class file %s",
1799 start_pc, tbl_name, THREAD);
1800 return nullptr;
1801 }
1802 if (end_pc > code_length) {
1803 classfile_parse_error(
1804 "Invalid length %u in %s in class file %s",
1805 length, tbl_name, THREAD);
1806 return nullptr;
1807 }
1808 const int cp_size = cp->length();
1809 guarantee_property(valid_symbol_at(name_index),
1810 "Name index %u in %s has bad constant type in class file %s",
1811 name_index, tbl_name, CHECK_NULL);
1812 guarantee_property(valid_symbol_at(descriptor_index),
1813 "Signature index %u in %s has bad constant type in class file %s",
1814 descriptor_index, tbl_name, CHECK_NULL);
1815
1816 const Symbol* const name = cp->symbol_at(name_index);
1817 const Symbol* const sig = cp->symbol_at(descriptor_index);
1818 verify_legal_field_name(name, CHECK_NULL);
1819 u2 extra_slot = 0;
1820 if (!isLVTT) {
1821 verify_legal_field_signature(name, sig, CHECK_NULL);
1822
1823 // 4894874: check special cases for double and long local variables
1824 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1825 sig == vmSymbols::type_signature(T_LONG)) {
1826 extra_slot = 1;
1827 }
1828 }
1829 guarantee_property((index + extra_slot) < max_locals,
1830 "Invalid index %u in %s in class file %s",
1831 index, tbl_name, CHECK_NULL);
1832 }
1833 }
1834 return localvariable_table_start;
1835 }
1836
1837 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1838 u4 code_attribute_length,
1839 TRAPS) {
1840 assert(cfs != nullptr, "invariant");
1841
1842 if (0 == code_attribute_length) {
1843 return nullptr;
1844 }
1845
1846 const u1* const stackmap_table_start = cfs->current();
1847 assert(stackmap_table_start != nullptr, "null stackmap table");
1848
1849 // check code_attribute_length
1850 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1851
1852 return stackmap_table_start;
1853 }
1854
1855 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1856 u2* const checked_exceptions_length,
1857 u4 method_attribute_length,
1858 TRAPS) {
1859 assert(cfs != nullptr, "invariant");
1860 assert(checked_exceptions_length != nullptr, "invariant");
1861
1862 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1863 *checked_exceptions_length = cfs->get_u2_fast();
1864 const unsigned int size =
1865 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1866 const unsafe_u2* const checked_exceptions_start = cfs->current();
1867 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1868 if (!_need_verify) {
1869 cfs->skip_u2_fast(size);
1870 } else {
1871 // Verify each value in the checked exception table
1872 u2 checked_exception;
1873 const u2 len = *checked_exceptions_length;
1874 cfs->guarantee_more(2 * len, CHECK_NULL);
1875 for (int i = 0; i < len; i++) {
1876 checked_exception = cfs->get_u2_fast();
1877 guarantee_property(
1878 valid_klass_reference_at(checked_exception),
1879 "Exception name has bad type at constant pool %u in class file %s",
1880 checked_exception, CHECK_NULL);
1881 }
1882 }
1883 // check exceptions attribute length
1884 if (_need_verify) {
1885 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1886 sizeof(u2) * size),
1887 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1888 }
1889 return checked_exceptions_start;
1890 }
1891
1892 void ClassFileParser::throwIllegalSignature(const char* type,
1893 const Symbol* name,
1894 const Symbol* sig,
1895 TRAPS) const {
1896 assert(name != nullptr, "invariant");
1897 assert(sig != nullptr, "invariant");
1898
1899 ResourceMark rm(THREAD);
1900 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1901 Exceptions::fthrow(THREAD_AND_LOCATION,
1902 vmSymbols::java_lang_ClassFormatError(),
1903 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1904 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1905 }
1906
1907 AnnotationCollector::ID
1908 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1909 const Symbol* name,
1910 const bool can_access_vm_annotations) {
1911 const vmSymbolID sid = vmSymbols::find_sid(name);
1912 // Privileged code can use all annotations. Other code silently drops some.
1913 const bool privileged = loader_data->is_boot_class_loader_data() ||
1914 loader_data->is_platform_class_loader_data() ||
1915 can_access_vm_annotations;
1916 switch (sid) {
1917 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1918 if (_location != _in_method) break; // only allow for methods
1919 if (!privileged) break; // only allow in privileged code
1920 return _method_CallerSensitive;
1921 }
1922 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1923 if (_location != _in_method) break; // only allow for methods
1924 if (!privileged) break; // only allow in privileged code
1925 return _method_ForceInline;
1926 }
1927 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1928 if (_location != _in_method) break; // only allow for methods
1929 if (!privileged) break; // only allow in privileged code
1930 return _method_DontInline;
1931 }
1932 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1933 if (_location != _in_method) break; // only allow for methods
1934 if (!privileged) break; // only allow in privileged code
1935 return _method_ChangesCurrentThread;
1936 }
1937 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1938 if (_location != _in_method) break; // only allow for methods
1939 if (!privileged) break; // only allow in privileged code
1940 return _method_JvmtiHideEvents;
1941 }
1942 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1943 if (_location != _in_method) break; // only allow for methods
1944 if (!privileged) break; // only allow in privileged code
1945 return _method_JvmtiMountTransition;
1946 }
1947 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1948 if (_location != _in_method) break; // only allow for methods
1949 if (!privileged) break; // only allow in privileged code
1950 return _method_InjectedProfile;
1951 }
1952 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1953 if (_location != _in_method) break; // only allow for methods
1954 if (!privileged) break; // only allow in privileged code
1955 return _method_LambdaForm_Compiled;
1956 }
1957 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1958 if (_location != _in_method) break; // only allow for methods
1959 if (!privileged) break; // only allow in privileged code
1960 return _method_Hidden;
1961 }
1962 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1963 if (_location != _in_method) break; // only allow for methods
1964 if (!privileged) break; // only allow in privileged code
1965 return _method_Scoped;
1966 }
1967 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1968 if (_location != _in_method) break; // only allow for methods
1969 if (!privileged) break; // only allow in privileged code
1970 return _method_IntrinsicCandidate;
1971 }
1972 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1973 if (_location != _in_field) break; // only allow for fields
1974 if (!privileged) break; // only allow in privileged code
1975 return _field_Stable;
1976 }
1977 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_TrustFinalFields_signature): {
1978 if (_location != _in_class) break; // only allow for classes
1979 if (!privileged) break; // only allow in privileged code
1980 return _jdk_internal_vm_annotation_TrustFinalFields;
1981 }
1982 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1983 if (_location != _in_field && _location != _in_class) {
1984 break; // only allow for fields and classes
1985 }
1986 if (!EnableContended || (RestrictContended && !privileged)) {
1987 break; // honor privileges
1988 }
1989 return _jdk_internal_vm_annotation_Contended;
1990 }
1991 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1992 if (_location != _in_method) break; // only allow for methods
1993 if (RestrictReservedStack && !privileged) break; // honor privileges
1994 return _jdk_internal_vm_annotation_ReservedStackAccess;
1995 }
1996 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1997 if (_location != _in_class) break; // only allow for classes
1998 if (!privileged) break; // only allow in privileged code
1999 return _jdk_internal_ValueBased;
2000 }
2001 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2002 if (_location != _in_class) break; // only allow for classes
2003 return _jdk_internal_LooselyConsistentValue;
2004 }
2005 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2006 if (_location != _in_field) break; // only allow for fields
2007 return _jdk_internal_NullRestricted;
2008 }
2009 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2010 return _java_lang_Deprecated;
2011 }
2012 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2013 if (_location != _in_class) break; // only allow for classes
2014 if (!privileged) break; // only allow in privileged code
2015 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2016 }
2017 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2018 if (_location != _in_method) break; // only allow for methods
2019 if (!privileged) break; // only allow in privileged code
2020 return _method_AOTRuntimeSetup;
2021 }
2022 default: {
2023 break;
2024 }
2025 }
2026 return AnnotationCollector::_unknown;
2027 }
2028
2029 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2030 if (is_contended())
2031 // Setting the contended group also sets the contended bit in field flags
2032 f->set_contended_group(contended_group());
2033 if (is_stable())
2034 (f->field_flags_addr())->update_stable(true);
2035 }
2036
2037 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2038 // If there's an error deallocate metadata for field annotations
2039 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2040 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2041 }
2042
2043 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2044 if (has_annotation(_method_CallerSensitive))
2045 m->set_caller_sensitive();
2046 if (has_annotation(_method_ForceInline))
2047 m->set_force_inline();
2048 if (has_annotation(_method_DontInline))
2049 m->set_dont_inline();
2050 if (has_annotation(_method_ChangesCurrentThread))
2051 m->set_changes_current_thread();
2052 if (has_annotation(_method_JvmtiHideEvents))
2053 m->set_jvmti_hide_events();
2054 if (has_annotation(_method_JvmtiMountTransition))
2055 m->set_jvmti_mount_transition();
2056 if (has_annotation(_method_InjectedProfile))
2057 m->set_has_injected_profile();
2058 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2059 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2060 if (has_annotation(_method_Hidden))
2061 m->set_is_hidden();
2062 if (has_annotation(_method_Scoped))
2063 m->set_scoped();
2064 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2065 m->set_intrinsic_candidate();
2066 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2067 m->set_has_reserved_stack_access();
2068 if (has_annotation(_java_lang_Deprecated))
2069 m->set_deprecated();
2070 if (has_annotation(_java_lang_Deprecated_for_removal))
2071 m->set_deprecated_for_removal();
2072 }
2073
2074 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2075 assert(ik != nullptr, "invariant");
2076 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2077 ik->set_is_contended(is_contended());
2078 }
2079 if (has_annotation(_jdk_internal_ValueBased)) {
2080 ik->set_has_value_based_class_annotation();
2081 if (DiagnoseSyncOnValueBasedClasses) {
2082 ik->set_is_value_based();
2083 }
2084 }
2085 if (has_annotation(_java_lang_Deprecated)) {
2086 Array<Method*>* methods = ik->methods();
2087 int length = ik->methods()->length();
2088 for (int i = 0; i < length; i++) {
2089 Method* m = methods->at(i);
2090 m->set_deprecated();
2091 }
2092 }
2093 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2094 Array<Method*>* methods = ik->methods();
2095 int length = ik->methods()->length();
2096 for (int i = 0; i < length; i++) {
2097 Method* m = methods->at(i);
2098 m->set_deprecated_for_removal();
2099 }
2100 }
2101 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) {
2102 ik->set_has_aot_safe_initializer();
2103 }
2104 if (has_annotation(_jdk_internal_vm_annotation_TrustFinalFields)) {
2105 ik->set_trust_final_fields(true);
2106 }
2107 }
2108
2109 #define MAX_ARGS_SIZE 255
2110 #define MAX_CODE_SIZE 65535
2111 #define INITIAL_MAX_LVT_NUMBER 256
2112
2113 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2114 *
2115 * Rules for LVT's and LVTT's are:
2116 * - There can be any number of LVT's and LVTT's.
2117 * - If there are n LVT's, it is the same as if there was just
2118 * one LVT containing all the entries from the n LVT's.
2119 * - There may be no more than one LVT entry per local variable.
2120 * Two LVT entries are 'equal' if these fields are the same:
2121 * start_pc, length, name, slot
2122 * - There may be no more than one LVTT entry per each LVT entry.
2123 * Each LVTT entry has to match some LVT entry.
2124 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2125 */
2126 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2127 int lvt_cnt,
2128 u2* const localvariable_table_length,
2129 const unsafe_u2** const localvariable_table_start,
2130 int lvtt_cnt,
2131 u2* const localvariable_type_table_length,
2132 const unsafe_u2** const localvariable_type_table_start,
2133 TRAPS) {
2134
2135 ResourceMark rm(THREAD);
2136
2137 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*,
2138 256, AnyObj::RESOURCE_AREA, mtInternal,
2139 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2140
2141 LVT_HashTable* const table = new LVT_HashTable();
2142
2143 // To fill LocalVariableTable in
2144 const Classfile_LVT_Element* cf_lvt;
2145 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2146
2147 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2148 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2149 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2150 copy_lvt_element(&cf_lvt[idx], lvt);
2151 // If no duplicates, add LVT elem in hashtable.
2152 if (table->put(*lvt, lvt) == false
2153 && _need_verify
2154 && _major_version >= JAVA_1_5_VERSION) {
2155 classfile_parse_error("Duplicated LocalVariableTable attribute "
2156 "entry for '%s' in class file %s",
2157 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2158 THREAD);
2159 return;
2160 }
2161 }
2162 }
2163
2164 // To merge LocalVariableTable and LocalVariableTypeTable
2165 const Classfile_LVT_Element* cf_lvtt;
2166 LocalVariableTableElement lvtt_elem;
2167
2168 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2169 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2170 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2171 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2172 LocalVariableTableElement** entry = table->get(lvtt_elem);
2173 if (entry == nullptr) {
2174 if (_need_verify) {
2175 classfile_parse_error("LVTT entry for '%s' in class file %s "
2176 "does not match any LVT entry",
2177 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2178 THREAD);
2179 return;
2180 }
2181 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2182 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2183 "entry for '%s' in class file %s",
2184 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2185 THREAD);
2186 return;
2187 } else {
2188 // to add generic signatures into LocalVariableTable
2189 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2190 }
2191 }
2192 }
2193 }
2194
2195
2196 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2197 const u1* runtime_visible_annotations,
2198 int runtime_visible_annotations_length,
2199 const u1* runtime_visible_parameter_annotations,
2200 int runtime_visible_parameter_annotations_length,
2201 const u1* runtime_visible_type_annotations,
2202 int runtime_visible_type_annotations_length,
2203 const u1* annotation_default,
2204 int annotation_default_length,
2205 TRAPS) {
2206
2207 AnnotationArray* a;
2208
2209 if (runtime_visible_annotations_length > 0) {
2210 a = allocate_annotations(runtime_visible_annotations,
2211 runtime_visible_annotations_length,
2212 CHECK);
2213 cm->set_method_annotations(a);
2214 }
2215
2216 if (runtime_visible_parameter_annotations_length > 0) {
2217 a = allocate_annotations(runtime_visible_parameter_annotations,
2218 runtime_visible_parameter_annotations_length,
2219 CHECK);
2220 cm->set_parameter_annotations(a);
2221 }
2222
2223 if (annotation_default_length > 0) {
2224 a = allocate_annotations(annotation_default,
2225 annotation_default_length,
2226 CHECK);
2227 cm->set_default_annotations(a);
2228 }
2229
2230 if (runtime_visible_type_annotations_length > 0) {
2231 a = allocate_annotations(runtime_visible_type_annotations,
2232 runtime_visible_type_annotations_length,
2233 CHECK);
2234 cm->set_type_annotations(a);
2235 }
2236 }
2237
2238
2239 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2240 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2241 // Method* to save footprint, so we only know the size of the resulting Method* when the
2242 // entire method attribute is parsed.
2243 //
2244 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2245
2246 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2247 bool is_interface,
2248 const ConstantPool* cp,
2249 bool* const has_localvariable_table,
2250 TRAPS) {
2251 assert(cfs != nullptr, "invariant");
2252 assert(cp != nullptr, "invariant");
2253 assert(has_localvariable_table != nullptr, "invariant");
2254
2255 ResourceMark rm(THREAD);
2256 // Parse fixed parts:
2257 // access_flags, name_index, descriptor_index, attributes_count
2258 cfs->guarantee_more(8, CHECK_NULL);
2259
2260 u2 flags = cfs->get_u2_fast();
2261 const u2 name_index = cfs->get_u2_fast();
2262 const int cp_size = cp->length();
2263 guarantee_property(
2264 valid_symbol_at(name_index),
2265 "Illegal constant pool index %u for method name in class file %s",
2266 name_index, CHECK_NULL);
2267 const Symbol* const name = cp->symbol_at(name_index);
2268 verify_legal_method_name(name, CHECK_NULL);
2269
2270 const u2 signature_index = cfs->get_u2_fast();
2271 guarantee_property(
2272 valid_symbol_at(signature_index),
2273 "Illegal constant pool index %u for method signature in class file %s",
2274 signature_index, CHECK_NULL);
2275 const Symbol* const signature = cp->symbol_at(signature_index);
2276
2277 if (name == vmSymbols::class_initializer_name()) {
2278 // We ignore the other access flags for a valid class initializer.
2279 // (JVM Spec 2nd ed., chapter 4.6)
2280 if (_major_version < 51) { // backward compatibility
2281 flags = JVM_ACC_STATIC;
2282 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2283 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2284 } else {
2285 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2286 return nullptr;
2287 }
2288 } else {
2289 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL);
2290 }
2291
2292 if (name == vmSymbols::object_initializer_name() && is_interface) {
2293 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2294 return nullptr;
2295 }
2296
2297 if (Arguments::is_valhalla_enabled()) {
2298 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2299 && ((flags & JVM_ACC_STATIC) == 0 )
2300 && !_access_flags.is_identity_class()) {
2301 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2302 return nullptr;
2303 }
2304 }
2305
2306 int args_size = -1; // only used when _need_verify is true
2307 if (_need_verify) {
2308 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2309 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2310 verify_legal_method_signature(name, signature, CHECK_NULL);
2311 if (args_size > MAX_ARGS_SIZE) {
2312 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2313 return nullptr;
2314 }
2315 }
2316
2317 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2318
2319 // Default values for code and exceptions attribute elements
2320 u2 max_stack = 0;
2321 u2 max_locals = 0;
2322 u4 code_length = 0;
2323 const u1* code_start = nullptr;
2324 u2 exception_table_length = 0;
2325 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2326 Array<int>* exception_handlers = Universe::the_empty_int_array();
2327 u2 checked_exceptions_length = 0;
2328 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2329 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2330 int linenumber_table_length = 0;
2331 int total_lvt_length = 0;
2332 u2 lvt_cnt = 0;
2333 u2 lvtt_cnt = 0;
2334 bool lvt_allocated = false;
2335 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2336 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2337 u2* localvariable_table_length = nullptr;
2338 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2339 u2* localvariable_type_table_length = nullptr;
2340 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2341 int method_parameters_length = -1;
2342 const u1* method_parameters_data = nullptr;
2343 bool method_parameters_seen = false;
2344 bool parsed_code_attribute = false;
2345 bool parsed_checked_exceptions_attribute = false;
2346 bool parsed_stackmap_attribute = false;
2347 // stackmap attribute - JDK1.5
2348 const u1* stackmap_data = nullptr;
2349 int stackmap_data_length = 0;
2350 u2 generic_signature_index = 0;
2351 MethodAnnotationCollector parsed_annotations;
2352 const u1* runtime_visible_annotations = nullptr;
2353 int runtime_visible_annotations_length = 0;
2354 const u1* runtime_visible_parameter_annotations = nullptr;
2355 int runtime_visible_parameter_annotations_length = 0;
2356 const u1* runtime_visible_type_annotations = nullptr;
2357 int runtime_visible_type_annotations_length = 0;
2358 bool runtime_invisible_annotations_exists = false;
2359 bool runtime_invisible_type_annotations_exists = false;
2360 bool runtime_invisible_parameter_annotations_exists = false;
2361 const u1* annotation_default = nullptr;
2362 int annotation_default_length = 0;
2363
2364 // Parse code and exceptions attribute
2365 u2 method_attributes_count = cfs->get_u2_fast();
2366 while (method_attributes_count--) {
2367 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2368 const u2 method_attribute_name_index = cfs->get_u2_fast();
2369 const u4 method_attribute_length = cfs->get_u4_fast();
2370 guarantee_property(
2371 valid_symbol_at(method_attribute_name_index),
2372 "Invalid method attribute name index %u in class file %s",
2373 method_attribute_name_index, CHECK_NULL);
2374
2375 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2376 if (method_attribute_name == vmSymbols::tag_code()) {
2377 // Parse Code attribute
2378 if (_need_verify) {
2379 guarantee_property(
2380 !access_flags.is_native() && !access_flags.is_abstract(),
2381 "Code attribute in native or abstract methods in class file %s",
2382 CHECK_NULL);
2383 }
2384 if (parsed_code_attribute) {
2385 classfile_parse_error("Multiple Code attributes in class file %s",
2386 THREAD);
2387 return nullptr;
2388 }
2389 parsed_code_attribute = true;
2390
2391 // Stack size, locals size, and code size
2392 cfs->guarantee_more(8, CHECK_NULL);
2393 max_stack = cfs->get_u2_fast();
2394 max_locals = cfs->get_u2_fast();
2395 code_length = cfs->get_u4_fast();
2396 if (_need_verify) {
2397 guarantee_property(args_size <= max_locals,
2398 "Arguments can't fit into locals in class file %s",
2399 CHECK_NULL);
2400 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2401 "Invalid method Code length %u in class file %s",
2402 code_length, CHECK_NULL);
2403 }
2404 // Code pointer
2405 code_start = cfs->current();
2406 assert(code_start != nullptr, "null code start");
2407 cfs->guarantee_more(code_length, CHECK_NULL);
2408 cfs->skip_u1_fast(code_length);
2409
2410 // Exception handler table
2411 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2412 exception_table_length = cfs->get_u2_fast();
2413 if (exception_table_length > 0) {
2414 exception_table_start = parse_exception_table(cfs,
2415 code_length,
2416 exception_table_length,
2417 CHECK_NULL);
2418 }
2419
2420 // Parse additional attributes in code attribute
2421 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2422 u2 code_attributes_count = cfs->get_u2_fast();
2423
2424 unsigned int calculated_attribute_length = 0;
2425
2426 calculated_attribute_length =
2427 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2428 calculated_attribute_length += checked_cast<unsigned int>(
2429 code_length +
2430 sizeof(exception_table_length) +
2431 sizeof(code_attributes_count) +
2432 exception_table_length *
2433 ( sizeof(u2) + // start_pc
2434 sizeof(u2) + // end_pc
2435 sizeof(u2) + // handler_pc
2436 sizeof(u2) )); // catch_type_index
2437
2438 while (code_attributes_count--) {
2439 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2440 const u2 code_attribute_name_index = cfs->get_u2_fast();
2441 const u4 code_attribute_length = cfs->get_u4_fast();
2442 calculated_attribute_length += code_attribute_length +
2443 (unsigned)sizeof(code_attribute_name_index) +
2444 (unsigned)sizeof(code_attribute_length);
2445 guarantee_property(valid_symbol_at(code_attribute_name_index),
2446 "Invalid code attribute name index %u in class file %s",
2447 code_attribute_name_index,
2448 CHECK_NULL);
2449 if (LoadLineNumberTables &&
2450 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2451 // Parse and compress line number table
2452 parse_linenumber_table(code_attribute_length,
2453 code_length,
2454 &linenumber_table,
2455 CHECK_NULL);
2456
2457 } else if (LoadLocalVariableTables &&
2458 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2459 // Parse local variable table
2460 if (!lvt_allocated) {
2461 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2462 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2463 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2464 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2465 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2466 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2467 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2468 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2469 lvt_allocated = true;
2470 }
2471 if (lvt_cnt == max_lvt_cnt) {
2472 max_lvt_cnt <<= 1;
2473 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2474 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2475 }
2476 localvariable_table_start[lvt_cnt] =
2477 parse_localvariable_table(cfs,
2478 code_length,
2479 max_locals,
2480 code_attribute_length,
2481 &localvariable_table_length[lvt_cnt],
2482 false, // is not LVTT
2483 CHECK_NULL);
2484 total_lvt_length += localvariable_table_length[lvt_cnt];
2485 lvt_cnt++;
2486 } else if (LoadLocalVariableTypeTables &&
2487 _major_version >= JAVA_1_5_VERSION &&
2488 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2489 if (!lvt_allocated) {
2490 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2491 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2492 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2493 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2494 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2495 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2496 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2497 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2498 lvt_allocated = true;
2499 }
2500 // Parse local variable type table
2501 if (lvtt_cnt == max_lvtt_cnt) {
2502 max_lvtt_cnt <<= 1;
2503 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2504 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2505 }
2506 localvariable_type_table_start[lvtt_cnt] =
2507 parse_localvariable_table(cfs,
2508 code_length,
2509 max_locals,
2510 code_attribute_length,
2511 &localvariable_type_table_length[lvtt_cnt],
2512 true, // is LVTT
2513 CHECK_NULL);
2514 lvtt_cnt++;
2515 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2516 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2517 // Stack map is only needed by the new verifier in JDK1.5.
2518 if (parsed_stackmap_attribute) {
2519 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2520 return nullptr;
2521 }
2522 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2523 stackmap_data_length = code_attribute_length;
2524 parsed_stackmap_attribute = true;
2525 } else {
2526 // Skip unknown attributes
2527 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2528 }
2529 }
2530 // check method attribute length
2531 if (_need_verify) {
2532 guarantee_property(method_attribute_length == calculated_attribute_length,
2533 "Code segment has wrong length in class file %s",
2534 CHECK_NULL);
2535 }
2536 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2537 // Parse Exceptions attribute
2538 if (parsed_checked_exceptions_attribute) {
2539 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2540 THREAD);
2541 return nullptr;
2542 }
2543 parsed_checked_exceptions_attribute = true;
2544 checked_exceptions_start =
2545 parse_checked_exceptions(cfs,
2546 &checked_exceptions_length,
2547 method_attribute_length,
2548 CHECK_NULL);
2549 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2550 // reject multiple method parameters
2551 if (method_parameters_seen) {
2552 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2553 THREAD);
2554 return nullptr;
2555 }
2556 method_parameters_seen = true;
2557 method_parameters_length = cfs->get_u1_fast();
2558 const u4 real_length = (method_parameters_length * 4u) + 1u;
2559 if (method_attribute_length != real_length) {
2560 classfile_parse_error(
2561 "Invalid MethodParameters method attribute length %u in class file",
2562 method_attribute_length, THREAD);
2563 return nullptr;
2564 }
2565 method_parameters_data = cfs->current();
2566 cfs->skip_u2_fast(method_parameters_length);
2567 cfs->skip_u2_fast(method_parameters_length);
2568 // ignore this attribute if it cannot be reflected
2569 if (!vmClasses::reflect_Parameter_klass_is_loaded())
2570 method_parameters_length = -1;
2571 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2572 if (method_attribute_length != 0) {
2573 classfile_parse_error(
2574 "Invalid Synthetic method attribute length %u in class file %s",
2575 method_attribute_length, THREAD);
2576 return nullptr;
2577 }
2578 // Should we check that there hasn't already been a synthetic attribute?
2579 access_flags.set_is_synthetic();
2580 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2581 if (method_attribute_length != 0) {
2582 classfile_parse_error(
2583 "Invalid Deprecated method attribute length %u in class file %s",
2584 method_attribute_length, THREAD);
2585 return nullptr;
2586 }
2587 } else if (_major_version >= JAVA_1_5_VERSION) {
2588 if (method_attribute_name == vmSymbols::tag_signature()) {
2589 if (generic_signature_index != 0) {
2590 classfile_parse_error(
2591 "Multiple Signature attributes for method in class file %s",
2592 THREAD);
2593 return nullptr;
2594 }
2595 if (method_attribute_length != 2) {
2596 classfile_parse_error(
2597 "Invalid Signature attribute length %u in class file %s",
2598 method_attribute_length, THREAD);
2599 return nullptr;
2600 }
2601 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2602 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2603 if (runtime_visible_annotations != nullptr) {
2604 classfile_parse_error(
2605 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2606 THREAD);
2607 return nullptr;
2608 }
2609 runtime_visible_annotations_length = method_attribute_length;
2610 runtime_visible_annotations = cfs->current();
2611 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2612 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2613 parse_annotations(cp,
2614 runtime_visible_annotations,
2615 runtime_visible_annotations_length,
2616 &parsed_annotations,
2617 _loader_data,
2618 _can_access_vm_annotations);
2619 cfs->skip_u1_fast(runtime_visible_annotations_length);
2620 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2621 if (runtime_invisible_annotations_exists) {
2622 classfile_parse_error(
2623 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2624 THREAD);
2625 return nullptr;
2626 }
2627 runtime_invisible_annotations_exists = true;
2628 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2629 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2630 if (runtime_visible_parameter_annotations != nullptr) {
2631 classfile_parse_error(
2632 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2633 THREAD);
2634 return nullptr;
2635 }
2636 runtime_visible_parameter_annotations_length = method_attribute_length;
2637 runtime_visible_parameter_annotations = cfs->current();
2638 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2639 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2640 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2641 if (runtime_invisible_parameter_annotations_exists) {
2642 classfile_parse_error(
2643 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2644 THREAD);
2645 return nullptr;
2646 }
2647 runtime_invisible_parameter_annotations_exists = true;
2648 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2649 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2650 if (annotation_default != nullptr) {
2651 classfile_parse_error(
2652 "Multiple AnnotationDefault attributes for method in class file %s",
2653 THREAD);
2654 return nullptr;
2655 }
2656 annotation_default_length = method_attribute_length;
2657 annotation_default = cfs->current();
2658 assert(annotation_default != nullptr, "null annotation default");
2659 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2660 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2661 if (runtime_visible_type_annotations != nullptr) {
2662 classfile_parse_error(
2663 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2664 THREAD);
2665 return nullptr;
2666 }
2667 runtime_visible_type_annotations_length = method_attribute_length;
2668 runtime_visible_type_annotations = cfs->current();
2669 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2670 // No need for the VM to parse Type annotations
2671 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2672 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2673 if (runtime_invisible_type_annotations_exists) {
2674 classfile_parse_error(
2675 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2676 THREAD);
2677 return nullptr;
2678 }
2679 runtime_invisible_type_annotations_exists = true;
2680 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2681 } else {
2682 // Skip unknown attributes
2683 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2684 }
2685 } else {
2686 // Skip unknown attributes
2687 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2688 }
2689 }
2690
2691 if (linenumber_table != nullptr) {
2692 linenumber_table->write_terminator();
2693 linenumber_table_length = linenumber_table->position();
2694 }
2695
2696 // Make sure there's at least one Code attribute in non-native/non-abstract method
2697 if (_need_verify) {
2698 guarantee_property(access_flags.is_native() ||
2699 access_flags.is_abstract() ||
2700 parsed_code_attribute,
2701 "Absent Code attribute in method that is not native or abstract in class file %s",
2702 CHECK_NULL);
2703 }
2704
2705 // All sizing information for a Method* is finally available, now create it
2706 InlineTableSizes sizes(
2707 total_lvt_length,
2708 linenumber_table_length,
2709 exception_table_length,
2710 checked_exceptions_length,
2711 method_parameters_length,
2712 generic_signature_index,
2713 runtime_visible_annotations_length,
2714 runtime_visible_parameter_annotations_length,
2715 runtime_visible_type_annotations_length,
2716 annotation_default_length,
2717 0);
2718
2719 Method* const m = Method::allocate(_loader_data,
2720 code_length,
2721 access_flags,
2722 &sizes,
2723 ConstMethod::NORMAL,
2724 _cp->symbol_at(name_index),
2725 CHECK_NULL);
2726
2727 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2728
2729 // Fill in information from fixed part (access_flags already set)
2730 m->set_constants(_cp);
2731 m->set_name_index(name_index);
2732 m->set_signature_index(signature_index);
2733 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2734 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2735
2736 // Fill in code attribute information
2737 m->set_max_stack(max_stack);
2738 m->set_max_locals(max_locals);
2739 if (stackmap_data != nullptr) {
2740 m->constMethod()->copy_stackmap_data(_loader_data,
2741 (u1*)stackmap_data,
2742 stackmap_data_length,
2743 CHECK_NULL);
2744 }
2745
2746 // Copy byte codes
2747 m->set_code((u1*)code_start);
2748
2749 // Copy line number table
2750 if (linenumber_table != nullptr) {
2751 memcpy(m->compressed_linenumber_table(),
2752 linenumber_table->buffer(),
2753 linenumber_table_length);
2754 }
2755
2756 // Copy exception table
2757 if (exception_table_length > 0) {
2758 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2759 m->exception_table_start(),
2760 exception_table_length * sizeof(ExceptionTableElement),
2761 sizeof(u2));
2762 }
2763
2764 // Copy method parameters
2765 if (method_parameters_length > 0) {
2766 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2767 for (int i = 0; i < method_parameters_length; i++) {
2768 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2769 method_parameters_data += 2;
2770 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2771 method_parameters_data += 2;
2772 }
2773 }
2774
2775 // Copy checked exceptions
2776 if (checked_exceptions_length > 0) {
2777 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2778 m->checked_exceptions_start(),
2779 checked_exceptions_length * sizeof(CheckedExceptionElement),
2780 sizeof(u2));
2781 }
2782
2783 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2784 if (total_lvt_length > 0) {
2785 *has_localvariable_table = true;
2786 copy_localvariable_table(m->constMethod(),
2787 lvt_cnt,
2788 localvariable_table_length,
2789 localvariable_table_start,
2790 lvtt_cnt,
2791 localvariable_type_table_length,
2792 localvariable_type_table_start,
2793 CHECK_NULL);
2794 }
2795
2796 if (parsed_annotations.has_any_annotations())
2797 parsed_annotations.apply_to(methodHandle(THREAD, m));
2798
2799 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2800 m->set_is_hidden();
2801 }
2802 if (parsed_annotations.has_aot_runtime_setup()) {
2803 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() ||
2804 !access_flags.is_private() || !access_flags.is_static()) {
2805 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL);
2806 }
2807 _has_aot_runtime_setup_method = true;
2808 }
2809
2810 // Copy annotations
2811 copy_method_annotations(m->constMethod(),
2812 runtime_visible_annotations,
2813 runtime_visible_annotations_length,
2814 runtime_visible_parameter_annotations,
2815 runtime_visible_parameter_annotations_length,
2816 runtime_visible_type_annotations,
2817 runtime_visible_type_annotations_length,
2818 annotation_default,
2819 annotation_default_length,
2820 CHECK_NULL);
2821
2822 if (InstanceKlass::is_finalization_enabled() &&
2823 name == vmSymbols::finalize_method_name() &&
2824 signature == vmSymbols::void_method_signature()) {
2825 if (m->is_empty_method()) {
2826 _has_empty_finalizer = true;
2827 } else {
2828 _has_finalizer = true;
2829 }
2830 }
2831
2832 NOT_PRODUCT(m->verify());
2833 return m;
2834 }
2835
2836
2837 // Side-effects: populates the _methods field in the parser
2838 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2839 bool is_interface,
2840 bool* const has_localvariable_table,
2841 bool* has_final_method,
2842 bool* declares_nonstatic_concrete_methods,
2843 TRAPS) {
2844 assert(cfs != nullptr, "invariant");
2845 assert(has_localvariable_table != nullptr, "invariant");
2846 assert(has_final_method != nullptr, "invariant");
2847 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2848
2849 assert(nullptr == _methods, "invariant");
2850
2851 cfs->guarantee_more(2, CHECK); // length
2852 const u2 length = cfs->get_u2_fast();
2853 if (length == 0) {
2854 _methods = Universe::the_empty_method_array();
2855 } else {
2856 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2857 length,
2858 nullptr,
2859 CHECK);
2860
2861 for (int index = 0; index < length; index++) {
2862 Method* method = parse_method(cfs,
2863 is_interface,
2864 _cp,
2865 has_localvariable_table,
2866 CHECK);
2867
2868 if (method->is_final()) {
2869 *has_final_method = true;
2870 }
2871 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2872 // used for interface initialization, and default method inheritance analysis
2873 if (is_interface && !(*declares_nonstatic_concrete_methods)
2874 && !method->is_abstract() && !method->is_static()) {
2875 *declares_nonstatic_concrete_methods = true;
2876 }
2877 _methods->at_put(index, method);
2878 }
2879
2880 if (_need_verify && length > 1) {
2881 // Check duplicated methods
2882 ResourceMark rm(THREAD);
2883 // Set containing name-signature pairs
2884 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2885 for (int i = 0; i < length; i++) {
2886 const Method* const m = _methods->at(i);
2887 NameSigHash name_and_sig(m->name(), m->signature());
2888 // If no duplicates, add name/signature in hashtable names_and_sigs.
2889 if(!names_and_sigs->put(name_and_sig, 0)) {
2890 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2891 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2892 return;
2893 }
2894 }
2895 }
2896 }
2897 }
2898
2899 static const intArray* sort_methods(Array<Method*>* methods) {
2900 const int length = methods->length();
2901 // If JVMTI original method ordering or sharing is enabled we have to
2902 // remember the original class file ordering.
2903 // We temporarily use the vtable_index field in the Method* to store the
2904 // class file index, so we can read in after calling qsort.
2905 // Put the method ordering in the shared archive.
2906 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2907 for (int index = 0; index < length; index++) {
2908 Method* const m = methods->at(index);
2909 assert(!m->valid_vtable_index(), "vtable index should not be set");
2910 m->set_vtable_index(index);
2911 }
2912 }
2913 // Sort method array by ascending method name (for faster lookups & vtable construction)
2914 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2915 Method::sort_methods(methods);
2916
2917 intArray* method_ordering = nullptr;
2918 // If JVMTI original method ordering or sharing is enabled construct int
2919 // array remembering the original ordering
2920 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2921 method_ordering = new intArray(length, length, -1);
2922 for (int index = 0; index < length; index++) {
2923 Method* const m = methods->at(index);
2924 const int old_index = m->vtable_index();
2925 assert(old_index >= 0 && old_index < length, "invalid method index");
2926 method_ordering->at_put(index, old_index);
2927 m->set_vtable_index(Method::invalid_vtable_index);
2928 }
2929 }
2930 return method_ordering;
2931 }
2932
2933 // Parse generic_signature attribute for methods and fields
2934 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2935 TRAPS) {
2936 assert(cfs != nullptr, "invariant");
2937
2938 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2939 const u2 generic_signature_index = cfs->get_u2_fast();
2940 guarantee_property(
2941 valid_symbol_at(generic_signature_index),
2942 "Invalid Signature attribute at constant pool index %u in class file %s",
2943 generic_signature_index, CHECK_0);
2944 return generic_signature_index;
2945 }
2946
2947 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2948 TRAPS) {
2949
2950 assert(cfs != nullptr, "invariant");
2951
2952 cfs->guarantee_more(2, CHECK); // sourcefile_index
2953 const u2 sourcefile_index = cfs->get_u2_fast();
2954 guarantee_property(
2955 valid_symbol_at(sourcefile_index),
2956 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2957 sourcefile_index, CHECK);
2958 set_class_sourcefile_index(sourcefile_index);
2959 }
2960
2961 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2962 int length,
2963 TRAPS) {
2964 assert(cfs != nullptr, "invariant");
2965
2966 const u1* const sde_buffer = cfs->current();
2967 assert(sde_buffer != nullptr, "null sde buffer");
2968
2969 // Don't bother storing it if there is no way to retrieve it
2970 if (JvmtiExport::can_get_source_debug_extension()) {
2971 assert((length+1) > length, "Overflow checking");
2972 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2973 for (int i = 0; i < length; i++) {
2974 sde[i] = sde_buffer[i];
2975 }
2976 sde[length] = '\0';
2977 set_class_sde_buffer((const char*)sde, length);
2978 }
2979 // Got utf8 string, set stream position forward
2980 cfs->skip_u1(length, CHECK);
2981 }
2982
2983
2984 // Inner classes can be static, private or protected (classic VM does this)
2985 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2986 JVM_ACC_PRIVATE | \
2987 JVM_ACC_PROTECTED | \
2988 JVM_ACC_STATIC \
2989 )
2990
2991 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2992 // Return -1 if none is found.
2993 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2994 Symbol* cp_klass_name = cp->klass_name_at(inner);
2995 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2996 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2997 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2998 return idx;
2999 }
3000 }
3001 return -1;
3002 }
3003
3004 // Return the outer_class_info_index for the InnerClasses entry containing the
3005 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
3006 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3007 if (inner == 0) return -1;
3008 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3009 if (idx == -1) return -1;
3010 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3011 return result;
3012 }
3013
3014 // Return true if circularity is found, false if no circularity is found.
3015 // Use Floyd's cycle finding algorithm.
3016 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3017 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3018 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3019
3020 while (fast != -1 && fast != 0) {
3021 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3022 return true; // found a circularity
3023 }
3024 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3025 if (fast == -1) return false;
3026 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3027 if (fast == -1) return false;
3028 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3029 assert(slow != -1, "sanity check");
3030 }
3031 return false;
3032 }
3033
3034 // Loop through each InnerClasses entry checking for circularities and duplications
3035 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3036 // return true if a circularity or entries with duplicate inner_class_info_indexes
3037 // are found.
3038 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3039 // Loop through each InnerClasses entry.
3040 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3041 // Return true if there are circular entries.
3042 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3043 return true;
3044 }
3045 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3046 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3047 y += InstanceKlass::inner_class_next_offset) {
3048
3049 // 4347400: make sure there's no duplicate entry in the classes array
3050 if (_major_version >= JAVA_1_5_VERSION) {
3051 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3052 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3053 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3054 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3055 "Duplicate entry in InnerClasses attribute in class file %s",
3056 CHECK_(true));
3057 }
3058 // Return true if there are two entries with the same inner_class_info_index.
3059 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3060 return true;
3061 }
3062 }
3063 }
3064 return false;
3065 }
3066
3067 // Return number of classes in the inner classes attribute table
3068 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3069 const ConstantPool* cp,
3070 const u1* const inner_classes_attribute_start,
3071 bool parsed_enclosingmethod_attribute,
3072 u2 enclosing_method_class_index,
3073 u2 enclosing_method_method_index,
3074 TRAPS) {
3075 const u1* const current_mark = cfs->current();
3076 u2 length = 0;
3077 if (inner_classes_attribute_start != nullptr) {
3078 cfs->set_current(inner_classes_attribute_start);
3079 cfs->guarantee_more(2, CHECK_0); // length
3080 length = cfs->get_u2_fast();
3081 }
3082
3083 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3084 // method data:
3085 // [inner_class_info_index,
3086 // outer_class_info_index,
3087 // inner_name_index,
3088 // inner_class_access_flags,
3089 // ...
3090 // enclosing_method_class_index,
3091 // enclosing_method_method_index]
3092 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3093 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3094 _inner_classes = inner_classes;
3095
3096 int index = 0;
3097 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3098 for (int n = 0; n < length; n++) {
3099 // Inner class index
3100 const u2 inner_class_info_index = cfs->get_u2_fast();
3101 guarantee_property(
3102 valid_klass_reference_at(inner_class_info_index),
3103 "inner_class_info_index %u has bad constant type in class file %s",
3104 inner_class_info_index, CHECK_0);
3105 // Outer class index
3106 const u2 outer_class_info_index = cfs->get_u2_fast();
3107 guarantee_property(
3108 outer_class_info_index == 0 ||
3109 valid_klass_reference_at(outer_class_info_index),
3110 "outer_class_info_index %u has bad constant type in class file %s",
3111 outer_class_info_index, CHECK_0);
3112
3113 if (outer_class_info_index != 0) {
3114 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3115 char* bytes = (char*)outer_class_name->bytes();
3116 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3117 "Outer class is an array class in class file %s", CHECK_0);
3118 }
3119 // Inner class name
3120 const u2 inner_name_index = cfs->get_u2_fast();
3121 guarantee_property(
3122 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3123 "inner_name_index %u has bad constant type in class file %s",
3124 inner_name_index, CHECK_0);
3125 if (_need_verify) {
3126 guarantee_property(inner_class_info_index != outer_class_info_index,
3127 "Class is both outer and inner class in class file %s", CHECK_0);
3128 }
3129
3130 // Access flags
3131 u2 flags;
3132 // JVM_ACC_MODULE is defined in JDK-9 and later.
3133 if (_major_version >= JAVA_9_VERSION) {
3134 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3135 } else {
3136 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3137 }
3138
3139 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3140 // Set abstract bit for old class files for backward compatibility
3141 flags |= JVM_ACC_ABSTRACT;
3142 }
3143
3144 if (!supports_inline_types()) {
3145 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3146 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3147 if (!is_module && !is_interface) {
3148 flags |= JVM_ACC_IDENTITY;
3149 }
3150 }
3151
3152 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3153 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3154 AccessFlags inner_access_flags(flags);
3155
3156 inner_classes->at_put(index++, inner_class_info_index);
3157 inner_classes->at_put(index++, outer_class_info_index);
3158 inner_classes->at_put(index++, inner_name_index);
3159 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3160 }
3161
3162 // Check for circular and duplicate entries.
3163 bool has_circularity = false;
3164 if (_need_verify) {
3165 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3166 if (has_circularity) {
3167 // If circularity check failed then ignore InnerClasses attribute.
3168 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3169 index = 0;
3170 if (parsed_enclosingmethod_attribute) {
3171 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3172 _inner_classes = inner_classes;
3173 } else {
3174 _inner_classes = Universe::the_empty_short_array();
3175 }
3176 }
3177 }
3178 // Set EnclosingMethod class and method indexes.
3179 if (parsed_enclosingmethod_attribute) {
3180 inner_classes->at_put(index++, enclosing_method_class_index);
3181 inner_classes->at_put(index++, enclosing_method_method_index);
3182 }
3183 assert(index == size || has_circularity, "wrong size");
3184
3185 // Restore buffer's current position.
3186 cfs->set_current(current_mark);
3187
3188 return length;
3189 }
3190
3191 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3192 const u1* const nest_members_attribute_start,
3193 TRAPS) {
3194 const u1* const current_mark = cfs->current();
3195 u2 length = 0;
3196 if (nest_members_attribute_start != nullptr) {
3197 cfs->set_current(nest_members_attribute_start);
3198 cfs->guarantee_more(2, CHECK_0); // length
3199 length = cfs->get_u2_fast();
3200 }
3201 const int size = length;
3202 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3203 _nest_members = nest_members;
3204
3205 int index = 0;
3206 cfs->guarantee_more(2 * length, CHECK_0);
3207 for (int n = 0; n < length; n++) {
3208 const u2 class_info_index = cfs->get_u2_fast();
3209 guarantee_property(
3210 valid_klass_reference_at(class_info_index),
3211 "Nest member class_info_index %u has bad constant type in class file %s",
3212 class_info_index, CHECK_0);
3213 nest_members->at_put(index++, class_info_index);
3214 }
3215 assert(index == size, "wrong size");
3216
3217 // Restore buffer's current position.
3218 cfs->set_current(current_mark);
3219
3220 return length;
3221 }
3222
3223 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3224 const u1* const permitted_subclasses_attribute_start,
3225 TRAPS) {
3226 const u1* const current_mark = cfs->current();
3227 u2 length = 0;
3228 if (permitted_subclasses_attribute_start != nullptr) {
3229 cfs->set_current(permitted_subclasses_attribute_start);
3230 cfs->guarantee_more(2, CHECK_0); // length
3231 length = cfs->get_u2_fast();
3232 }
3233 const int size = length;
3234 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3235 _permitted_subclasses = permitted_subclasses;
3236
3237 if (length > 0) {
3238 int index = 0;
3239 cfs->guarantee_more(2 * length, CHECK_0);
3240 for (int n = 0; n < length; n++) {
3241 const u2 class_info_index = cfs->get_u2_fast();
3242 guarantee_property(
3243 valid_klass_reference_at(class_info_index),
3244 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3245 class_info_index, CHECK_0);
3246 permitted_subclasses->at_put(index++, class_info_index);
3247 }
3248 assert(index == size, "wrong size");
3249 }
3250
3251 // Restore buffer's current position.
3252 cfs->set_current(current_mark);
3253
3254 return length;
3255 }
3256
3257 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3258 const u1* const loadable_descriptors_attribute_start,
3259 TRAPS) {
3260 const u1* const current_mark = cfs->current();
3261 u2 length = 0;
3262 if (loadable_descriptors_attribute_start != nullptr) {
3263 cfs->set_current(loadable_descriptors_attribute_start);
3264 cfs->guarantee_more(2, CHECK_0); // length
3265 length = cfs->get_u2_fast();
3266 }
3267 const int size = length;
3268 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3269 _loadable_descriptors = loadable_descriptors;
3270 if (length > 0) {
3271 int index = 0;
3272 cfs->guarantee_more(2 * length, CHECK_0);
3273 for (int n = 0; n < length; n++) {
3274 const u2 descriptor_index = cfs->get_u2_fast();
3275 guarantee_property(
3276 valid_symbol_at(descriptor_index),
3277 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3278 descriptor_index, CHECK_0);
3279 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3280 bool valid = legal_field_signature(descriptor, CHECK_0);
3281 if(!valid) {
3282 ResourceMark rm(THREAD);
3283 Exceptions::fthrow(THREAD_AND_LOCATION,
3284 vmSymbols::java_lang_ClassFormatError(),
3285 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3286 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3287 return 0;
3288 }
3289 loadable_descriptors->at_put(index++, descriptor_index);
3290 }
3291 assert(index == size, "wrong size");
3292 }
3293
3294 // Restore buffer's current position.
3295 cfs->set_current(current_mark);
3296
3297 return length;
3298 }
3299
3300 // Record {
3301 // u2 attribute_name_index;
3302 // u4 attribute_length;
3303 // u2 components_count;
3304 // component_info components[components_count];
3305 // }
3306 // component_info {
3307 // u2 name_index;
3308 // u2 descriptor_index
3309 // u2 attributes_count;
3310 // attribute_info_attributes[attributes_count];
3311 // }
3312 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3313 const ConstantPool* cp,
3314 const u1* const record_attribute_start,
3315 TRAPS) {
3316 const u1* const current_mark = cfs->current();
3317 int components_count = 0;
3318 unsigned int calculate_attr_size = 0;
3319 if (record_attribute_start != nullptr) {
3320 cfs->set_current(record_attribute_start);
3321 cfs->guarantee_more(2, CHECK_0); // num of components
3322 components_count = (int)cfs->get_u2_fast();
3323 calculate_attr_size = 2;
3324 }
3325
3326 Array<RecordComponent*>* const record_components =
3327 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3328 _record_components = record_components;
3329
3330 for (int x = 0; x < components_count; x++) {
3331 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3332
3333 const u2 name_index = cfs->get_u2_fast();
3334 guarantee_property(valid_symbol_at(name_index),
3335 "Invalid constant pool index %u for name in Record attribute in class file %s",
3336 name_index, CHECK_0);
3337 const Symbol* const name = cp->symbol_at(name_index);
3338 verify_legal_field_name(name, CHECK_0);
3339
3340 const u2 descriptor_index = cfs->get_u2_fast();
3341 guarantee_property(valid_symbol_at(descriptor_index),
3342 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3343 descriptor_index, CHECK_0);
3344 const Symbol* const descr = cp->symbol_at(descriptor_index);
3345 verify_legal_field_signature(name, descr, CHECK_0);
3346
3347 const u2 attributes_count = cfs->get_u2_fast();
3348 calculate_attr_size += 6;
3349 u2 generic_sig_index = 0;
3350 const u1* runtime_visible_annotations = nullptr;
3351 int runtime_visible_annotations_length = 0;
3352 bool runtime_invisible_annotations_exists = false;
3353 const u1* runtime_visible_type_annotations = nullptr;
3354 int runtime_visible_type_annotations_length = 0;
3355 bool runtime_invisible_type_annotations_exists = false;
3356
3357 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3358 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3359 for (int y = 0; y < attributes_count; y++) {
3360 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3361 const u2 attribute_name_index = cfs->get_u2_fast();
3362 const u4 attribute_length = cfs->get_u4_fast();
3363 calculate_attr_size += 6;
3364 guarantee_property(
3365 valid_symbol_at(attribute_name_index),
3366 "Invalid Record attribute name index %u in class file %s",
3367 attribute_name_index, CHECK_0);
3368
3369 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3370 if (attribute_name == vmSymbols::tag_signature()) {
3371 if (generic_sig_index != 0) {
3372 classfile_parse_error(
3373 "Multiple Signature attributes for Record component in class file %s",
3374 THREAD);
3375 return 0;
3376 }
3377 if (attribute_length != 2) {
3378 classfile_parse_error(
3379 "Invalid Signature attribute length %u in Record component in class file %s",
3380 attribute_length, THREAD);
3381 return 0;
3382 }
3383 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3384
3385 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3386 if (runtime_visible_annotations != nullptr) {
3387 classfile_parse_error(
3388 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3389 return 0;
3390 }
3391 runtime_visible_annotations_length = attribute_length;
3392 runtime_visible_annotations = cfs->current();
3393
3394 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3395 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3396 cfs->skip_u1_fast(runtime_visible_annotations_length);
3397
3398 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3399 if (runtime_invisible_annotations_exists) {
3400 classfile_parse_error(
3401 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3402 return 0;
3403 }
3404 runtime_invisible_annotations_exists = true;
3405 cfs->skip_u1(attribute_length, CHECK_0);
3406
3407 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3408 if (runtime_visible_type_annotations != nullptr) {
3409 classfile_parse_error(
3410 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3411 return 0;
3412 }
3413 runtime_visible_type_annotations_length = attribute_length;
3414 runtime_visible_type_annotations = cfs->current();
3415
3416 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3417 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3418 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3419
3420 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3421 if (runtime_invisible_type_annotations_exists) {
3422 classfile_parse_error(
3423 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3424 return 0;
3425 }
3426 runtime_invisible_type_annotations_exists = true;
3427 cfs->skip_u1(attribute_length, CHECK_0);
3428
3429 } else {
3430 // Skip unknown attributes
3431 cfs->skip_u1(attribute_length, CHECK_0);
3432 }
3433 calculate_attr_size += attribute_length;
3434 } // End of attributes For loop
3435
3436 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3437 runtime_visible_annotations_length,
3438 CHECK_0);
3439 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3440 runtime_visible_type_annotations_length,
3441 CHECK_0);
3442
3443 RecordComponent* record_component =
3444 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3445 annotations, type_annotations, CHECK_0);
3446 record_components->at_put(x, record_component);
3447 } // End of component processing loop
3448
3449 // Restore buffer's current position.
3450 cfs->set_current(current_mark);
3451 return calculate_attr_size;
3452 }
3453
3454 void ClassFileParser::parse_classfile_synthetic_attribute() {
3455 set_class_synthetic_flag(true);
3456 }
3457
3458 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3459 assert(cfs != nullptr, "invariant");
3460
3461 const u2 signature_index = cfs->get_u2(CHECK);
3462 guarantee_property(
3463 valid_symbol_at(signature_index),
3464 "Invalid constant pool index %u in Signature attribute in class file %s",
3465 signature_index, CHECK);
3466 set_class_generic_signature_index(signature_index);
3467 }
3468
3469 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3470 ConstantPool* cp,
3471 u4 attribute_byte_length,
3472 TRAPS) {
3473 assert(cfs != nullptr, "invariant");
3474 assert(cp != nullptr, "invariant");
3475 const int cp_size = cp->length();
3476
3477 const u1* const current_before_parsing = cfs->current();
3478
3479 guarantee_property(attribute_byte_length >= sizeof(u2),
3480 "Invalid BootstrapMethods attribute length %u in class file %s",
3481 attribute_byte_length,
3482 CHECK);
3483
3484 cfs->guarantee_more(attribute_byte_length, CHECK);
3485
3486 const int num_bootstrap_methods = cfs->get_u2_fast();
3487
3488 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods,
3489 "Short length on BootstrapMethods in class file %s",
3490 CHECK);
3491
3492 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3493
3494 // Eagerly assign the arrays so that they will be deallocated with the constant
3495 // pool if there is an error.
3496 BSMAttributeEntries::InsertionIterator iter =
3497 cp->bsm_entries().start_extension(num_bootstrap_methods,
3498 bootstrap_methods_u2_len,
3499 _loader_data,
3500 CHECK);
3501
3502 for (int i = 0; i < num_bootstrap_methods; i++) {
3503 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3504 u2 bootstrap_method_ref = cfs->get_u2_fast();
3505 u2 num_bootstrap_arguments = cfs->get_u2_fast();
3506 guarantee_property(
3507 valid_cp_range(bootstrap_method_ref, cp_size) &&
3508 cp->tag_at(bootstrap_method_ref).is_method_handle(),
3509 "bootstrap_method_index %u has bad constant type in class file %s",
3510 bootstrap_method_ref,
3511 CHECK);
3512 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc]
3513
3514 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments);
3515 guarantee_property(entry != nullptr,
3516 "Invalid BootstrapMethods num_bootstrap_methods."
3517 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK);
3518
3519 for (int argi = 0; argi < num_bootstrap_arguments; argi++) {
3520 const u2 argument_index = cfs->get_u2_fast();
3521 guarantee_property(
3522 valid_cp_range(argument_index, cp_size) &&
3523 cp->tag_at(argument_index).is_loadable_constant(),
3524 "argument_index %u has bad constant type in class file %s",
3525 argument_index,
3526 CHECK);
3527 entry->set_argument(argi, argument_index);
3528 }
3529 }
3530 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3531 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3532 "Bad length on BootstrapMethods in class file %s",
3533 CHECK);
3534 }
3535
3536 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3537 ConstantPool* cp,
3538 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3539 TRAPS) {
3540 assert(cfs != nullptr, "invariant");
3541 assert(cp != nullptr, "invariant");
3542 assert(parsed_annotations != nullptr, "invariant");
3543
3544 // Set inner classes attribute to default sentinel
3545 _inner_classes = Universe::the_empty_short_array();
3546 // Set nest members attribute to default sentinel
3547 _nest_members = Universe::the_empty_short_array();
3548 // Set _permitted_subclasses attribute to default sentinel
3549 _permitted_subclasses = Universe::the_empty_short_array();
3550 // Set _loadable_descriptors attribute to default sentinel
3551 _loadable_descriptors = Universe::the_empty_short_array();
3552 cfs->guarantee_more(2, CHECK); // attributes_count
3553 u2 attributes_count = cfs->get_u2_fast();
3554 bool parsed_sourcefile_attribute = false;
3555 bool parsed_innerclasses_attribute = false;
3556 bool parsed_nest_members_attribute = false;
3557 bool parsed_permitted_subclasses_attribute = false;
3558 bool parsed_loadable_descriptors_attribute = false;
3559 bool parsed_nest_host_attribute = false;
3560 bool parsed_record_attribute = false;
3561 bool parsed_enclosingmethod_attribute = false;
3562 bool parsed_bootstrap_methods_attribute = false;
3563 const u1* runtime_visible_annotations = nullptr;
3564 int runtime_visible_annotations_length = 0;
3565 const u1* runtime_visible_type_annotations = nullptr;
3566 int runtime_visible_type_annotations_length = 0;
3567 bool runtime_invisible_type_annotations_exists = false;
3568 bool runtime_invisible_annotations_exists = false;
3569 bool parsed_source_debug_ext_annotations_exist = false;
3570 const u1* inner_classes_attribute_start = nullptr;
3571 u4 inner_classes_attribute_length = 0;
3572 u2 enclosing_method_class_index = 0;
3573 u2 enclosing_method_method_index = 0;
3574 const u1* nest_members_attribute_start = nullptr;
3575 u4 nest_members_attribute_length = 0;
3576 const u1* record_attribute_start = nullptr;
3577 u4 record_attribute_length = 0;
3578 const u1* permitted_subclasses_attribute_start = nullptr;
3579 u4 permitted_subclasses_attribute_length = 0;
3580 const u1* loadable_descriptors_attribute_start = nullptr;
3581 u4 loadable_descriptors_attribute_length = 0;
3582
3583 // Iterate over attributes
3584 while (attributes_count--) {
3585 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3586 const u2 attribute_name_index = cfs->get_u2_fast();
3587 const u4 attribute_length = cfs->get_u4_fast();
3588 guarantee_property(
3589 valid_symbol_at(attribute_name_index),
3590 "Attribute name has bad constant pool index %u in class file %s",
3591 attribute_name_index, CHECK);
3592 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3593 if (tag == vmSymbols::tag_source_file()) {
3594 // Check for SourceFile tag
3595 if (_need_verify) {
3596 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3597 }
3598 if (parsed_sourcefile_attribute) {
3599 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3600 return;
3601 } else {
3602 parsed_sourcefile_attribute = true;
3603 }
3604 parse_classfile_sourcefile_attribute(cfs, CHECK);
3605 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3606 // Check for SourceDebugExtension tag
3607 if (parsed_source_debug_ext_annotations_exist) {
3608 classfile_parse_error(
3609 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3610 return;
3611 }
3612 parsed_source_debug_ext_annotations_exist = true;
3613 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3614 } else if (tag == vmSymbols::tag_inner_classes()) {
3615 // Check for InnerClasses tag
3616 if (parsed_innerclasses_attribute) {
3617 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3618 return;
3619 } else {
3620 parsed_innerclasses_attribute = true;
3621 }
3622 inner_classes_attribute_start = cfs->current();
3623 inner_classes_attribute_length = attribute_length;
3624 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3625 } else if (tag == vmSymbols::tag_synthetic()) {
3626 // Check for Synthetic tag
3627 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3628 if (attribute_length != 0) {
3629 classfile_parse_error(
3630 "Invalid Synthetic classfile attribute length %u in class file %s",
3631 attribute_length, THREAD);
3632 return;
3633 }
3634 parse_classfile_synthetic_attribute();
3635 } else if (tag == vmSymbols::tag_deprecated()) {
3636 // Check for Deprecated tag - 4276120
3637 if (attribute_length != 0) {
3638 classfile_parse_error(
3639 "Invalid Deprecated classfile attribute length %u in class file %s",
3640 attribute_length, THREAD);
3641 return;
3642 }
3643 } else if (_major_version >= JAVA_1_5_VERSION) {
3644 if (tag == vmSymbols::tag_signature()) {
3645 if (_generic_signature_index != 0) {
3646 classfile_parse_error(
3647 "Multiple Signature attributes in class file %s", THREAD);
3648 return;
3649 }
3650 if (attribute_length != 2) {
3651 classfile_parse_error(
3652 "Wrong Signature attribute length %u in class file %s",
3653 attribute_length, THREAD);
3654 return;
3655 }
3656 parse_classfile_signature_attribute(cfs, CHECK);
3657 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3658 if (runtime_visible_annotations != nullptr) {
3659 classfile_parse_error(
3660 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3661 return;
3662 }
3663 runtime_visible_annotations_length = attribute_length;
3664 runtime_visible_annotations = cfs->current();
3665 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3666 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3667 parse_annotations(cp,
3668 runtime_visible_annotations,
3669 runtime_visible_annotations_length,
3670 parsed_annotations,
3671 _loader_data,
3672 _can_access_vm_annotations);
3673 cfs->skip_u1_fast(runtime_visible_annotations_length);
3674 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3675 if (runtime_invisible_annotations_exists) {
3676 classfile_parse_error(
3677 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3678 return;
3679 }
3680 runtime_invisible_annotations_exists = true;
3681 cfs->skip_u1(attribute_length, CHECK);
3682 } else if (tag == vmSymbols::tag_enclosing_method()) {
3683 if (parsed_enclosingmethod_attribute) {
3684 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3685 return;
3686 } else {
3687 parsed_enclosingmethod_attribute = true;
3688 }
3689 guarantee_property(attribute_length == 4,
3690 "Wrong EnclosingMethod attribute length %u in class file %s",
3691 attribute_length, CHECK);
3692 cfs->guarantee_more(4, CHECK); // class_index, method_index
3693 enclosing_method_class_index = cfs->get_u2_fast();
3694 enclosing_method_method_index = cfs->get_u2_fast();
3695 if (enclosing_method_class_index == 0) {
3696 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3697 return;
3698 }
3699 // Validate the constant pool indices and types
3700 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3701 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3702 if (enclosing_method_method_index != 0 &&
3703 (!cp->is_within_bounds(enclosing_method_method_index) ||
3704 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3705 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3706 return;
3707 }
3708 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3709 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3710 if (parsed_bootstrap_methods_attribute) {
3711 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3712 return;
3713 }
3714 parsed_bootstrap_methods_attribute = true;
3715 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3716 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3717 if (runtime_visible_type_annotations != nullptr) {
3718 classfile_parse_error(
3719 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3720 return;
3721 }
3722 runtime_visible_type_annotations_length = attribute_length;
3723 runtime_visible_type_annotations = cfs->current();
3724 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3725 // No need for the VM to parse Type annotations
3726 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3727 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3728 if (runtime_invisible_type_annotations_exists) {
3729 classfile_parse_error(
3730 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3731 return;
3732 }
3733 runtime_invisible_type_annotations_exists = true;
3734 cfs->skip_u1(attribute_length, CHECK);
3735 } else if (_major_version >= JAVA_11_VERSION) {
3736 if (tag == vmSymbols::tag_nest_members()) {
3737 // Check for NestMembers tag
3738 if (parsed_nest_members_attribute) {
3739 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3740 return;
3741 } else {
3742 parsed_nest_members_attribute = true;
3743 }
3744 if (parsed_nest_host_attribute) {
3745 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3746 return;
3747 }
3748 nest_members_attribute_start = cfs->current();
3749 nest_members_attribute_length = attribute_length;
3750 cfs->skip_u1(nest_members_attribute_length, CHECK);
3751 } else if (tag == vmSymbols::tag_nest_host()) {
3752 if (parsed_nest_host_attribute) {
3753 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3754 return;
3755 } else {
3756 parsed_nest_host_attribute = true;
3757 }
3758 if (parsed_nest_members_attribute) {
3759 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3760 return;
3761 }
3762 if (_need_verify) {
3763 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3764 }
3765 cfs->guarantee_more(2, CHECK);
3766 u2 class_info_index = cfs->get_u2_fast();
3767 guarantee_property(
3768 valid_klass_reference_at(class_info_index),
3769 "Nest-host class_info_index %u has bad constant type in class file %s",
3770 class_info_index, CHECK);
3771 _nest_host = class_info_index;
3772
3773 } else if (_major_version >= JAVA_16_VERSION) {
3774 if (tag == vmSymbols::tag_record()) {
3775 if (parsed_record_attribute) {
3776 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3777 return;
3778 }
3779 parsed_record_attribute = true;
3780 record_attribute_start = cfs->current();
3781 record_attribute_length = attribute_length;
3782 } else if (_major_version >= JAVA_17_VERSION) {
3783 if (tag == vmSymbols::tag_permitted_subclasses()) {
3784 if (parsed_permitted_subclasses_attribute) {
3785 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3786 return;
3787 }
3788 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3789 if (_access_flags.is_final()) {
3790 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3791 return;
3792 }
3793 parsed_permitted_subclasses_attribute = true;
3794 permitted_subclasses_attribute_start = cfs->current();
3795 permitted_subclasses_attribute_length = attribute_length;
3796 }
3797 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3798 if (parsed_loadable_descriptors_attribute) {
3799 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3800 return;
3801 }
3802 parsed_loadable_descriptors_attribute = true;
3803 loadable_descriptors_attribute_start = cfs->current();
3804 loadable_descriptors_attribute_length = attribute_length;
3805 }
3806 }
3807 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3808 cfs->skip_u1(attribute_length, CHECK);
3809 } else {
3810 // Unknown attribute
3811 cfs->skip_u1(attribute_length, CHECK);
3812 }
3813 } else {
3814 // Unknown attribute
3815 cfs->skip_u1(attribute_length, CHECK);
3816 }
3817 } else {
3818 // Unknown attribute
3819 cfs->skip_u1(attribute_length, CHECK);
3820 }
3821 }
3822 _class_annotations = allocate_annotations(runtime_visible_annotations,
3823 runtime_visible_annotations_length,
3824 CHECK);
3825 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3826 runtime_visible_type_annotations_length,
3827 CHECK);
3828
3829 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3830 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3831 cfs,
3832 cp,
3833 inner_classes_attribute_start,
3834 parsed_innerclasses_attribute,
3835 enclosing_method_class_index,
3836 enclosing_method_method_index,
3837 CHECK);
3838 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3839 guarantee_property(
3840 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3841 "Wrong InnerClasses attribute length in class file %s", CHECK);
3842 }
3843 }
3844
3845 if (parsed_nest_members_attribute) {
3846 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3847 cfs,
3848 nest_members_attribute_start,
3849 CHECK);
3850 if (_need_verify) {
3851 guarantee_property(
3852 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3853 "Wrong NestMembers attribute length in class file %s", CHECK);
3854 }
3855 }
3856
3857 if (parsed_record_attribute) {
3858 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3859 cfs,
3860 cp,
3861 record_attribute_start,
3862 CHECK);
3863 if (_need_verify) {
3864 guarantee_property(record_attribute_length == calculated_attr_length,
3865 "Record attribute has wrong length in class file %s",
3866 CHECK);
3867 }
3868 }
3869
3870 if (parsed_permitted_subclasses_attribute) {
3871 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3872 cfs,
3873 permitted_subclasses_attribute_start,
3874 CHECK);
3875 if (_need_verify) {
3876 guarantee_property(
3877 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3878 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3879 }
3880 }
3881
3882 if (parsed_loadable_descriptors_attribute) {
3883 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3884 cfs,
3885 loadable_descriptors_attribute_start,
3886 CHECK);
3887 if (_need_verify) {
3888 guarantee_property(
3889 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3890 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3891 }
3892 }
3893
3894 if (_max_bootstrap_specifier_index >= 0) {
3895 guarantee_property(parsed_bootstrap_methods_attribute,
3896 "Missing BootstrapMethods attribute in class file %s", CHECK);
3897 }
3898 }
3899
3900 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3901 assert(k != nullptr, "invariant");
3902
3903 if (_synthetic_flag)
3904 k->set_is_synthetic();
3905 if (_sourcefile_index != 0) {
3906 k->set_source_file_name_index(_sourcefile_index);
3907 }
3908 if (_generic_signature_index != 0) {
3909 k->set_generic_signature_index(_generic_signature_index);
3910 }
3911 if (_sde_buffer != nullptr) {
3912 k->set_source_debug_extension(_sde_buffer, _sde_length);
3913 }
3914 }
3915
3916 // Create the Annotations object that will
3917 // hold the annotations array for the Klass.
3918 void ClassFileParser::create_combined_annotations(TRAPS) {
3919 if (_class_annotations == nullptr &&
3920 _class_type_annotations == nullptr &&
3921 _fields_annotations == nullptr &&
3922 _fields_type_annotations == nullptr) {
3923 // Don't create the Annotations object unnecessarily.
3924 return;
3925 }
3926
3927 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3928 annotations->set_class_annotations(_class_annotations);
3929 annotations->set_class_type_annotations(_class_type_annotations);
3930 annotations->set_fields_annotations(_fields_annotations);
3931 annotations->set_fields_type_annotations(_fields_type_annotations);
3932
3933 // This is the Annotations object that will be
3934 // assigned to InstanceKlass being constructed.
3935 _combined_annotations = annotations;
3936
3937 // The annotations arrays below has been transferred the
3938 // _combined_annotations so these fields can now be cleared.
3939 _class_annotations = nullptr;
3940 _class_type_annotations = nullptr;
3941 _fields_annotations = nullptr;
3942 _fields_type_annotations = nullptr;
3943 }
3944
3945 // Transfer ownership of metadata allocated to the InstanceKlass.
3946 void ClassFileParser::apply_parsed_class_metadata(
3947 InstanceKlass* this_klass,
3948 int java_fields_count) {
3949 assert(this_klass != nullptr, "invariant");
3950
3951 _cp->set_pool_holder(this_klass);
3952 this_klass->set_constants(_cp);
3953 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3954 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3955 this_klass->set_fields_status(_fields_status);
3956 this_klass->set_methods(_methods);
3957 this_klass->set_inner_classes(_inner_classes);
3958 this_klass->set_nest_members(_nest_members);
3959 this_klass->set_nest_host_index(_nest_host);
3960 this_klass->set_loadable_descriptors(_loadable_descriptors);
3961 this_klass->set_annotations(_combined_annotations);
3962 this_klass->set_permitted_subclasses(_permitted_subclasses);
3963 this_klass->set_record_components(_record_components);
3964 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3965
3966 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3967
3968 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3969 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3970 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3971 // its _super. If an OOM occurs while loading the current klass, its _super field
3972 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3973 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3974 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3975
3976 // Clear out these fields so they don't get deallocated by the destructor
3977 clear_class_metadata();
3978 }
3979
3980 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3981 int anno_length,
3982 TRAPS) {
3983 AnnotationArray* annotations = nullptr;
3984 if (anno != nullptr) {
3985 annotations = MetadataFactory::new_array<u1>(_loader_data,
3986 anno_length,
3987 CHECK_(annotations));
3988 for (int i = 0; i < anno_length; i++) {
3989 annotations->at_put(i, anno[i]);
3990 }
3991 }
3992 return annotations;
3993 }
3994
3995 void ClassFileParser::check_super_class(ConstantPool* const cp,
3996 const int super_class_index,
3997 const bool need_verify,
3998 TRAPS) {
3999 assert(cp != nullptr, "invariant");
4000
4001 if (super_class_index == 0) {
4002 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
4003 "Invalid superclass index 0 in class file %s",
4004 CHECK);
4005 } else {
4006 guarantee_property(valid_klass_reference_at(super_class_index),
4007 "Invalid superclass index %u in class file %s",
4008 super_class_index,
4009 CHECK);
4010
4011 // The class name should be legal because it is checked when parsing constant pool.
4012 // However, make sure it is not an array type.
4013 if (need_verify) {
4014 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4015 "Bad superclass name in class file %s", CHECK);
4016 }
4017 }
4018 }
4019
4020 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4021 _max_nonstatic_oop_maps = max_blocks;
4022 _nonstatic_oop_map_count = 0;
4023 if (max_blocks == 0) {
4024 _nonstatic_oop_maps = nullptr;
4025 } else {
4026 _nonstatic_oop_maps =
4027 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4028 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4029 }
4030 }
4031
4032 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4033 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4034 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4035 }
4036
4037 // addition of super oop maps
4038 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4039 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4040 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4041
4042 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4043 _nonstatic_oop_map_count += nof_blocks;
4044 }
4045
4046 // collection of oops
4047 void OopMapBlocksBuilder::add(int offset, int count) {
4048 if (_nonstatic_oop_map_count == 0) {
4049 _nonstatic_oop_map_count++;
4050 }
4051 OopMapBlock* nonstatic_oop_map = last_oop_map();
4052 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4053 nonstatic_oop_map->set_offset(offset);
4054 nonstatic_oop_map->set_count(count);
4055 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4056 nonstatic_oop_map->increment_count(count);
4057 } else { // Need a new one...
4058 _nonstatic_oop_map_count++;
4059 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4060 nonstatic_oop_map = last_oop_map();
4061 nonstatic_oop_map->set_offset(offset);
4062 nonstatic_oop_map->set_count(count);
4063 }
4064 }
4065
4066 // general purpose copy, e.g. into allocated instanceKlass
4067 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4068 if (_nonstatic_oop_map_count != 0) {
4069 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4070 }
4071 }
4072
4073 // Sort and compact adjacent blocks
4074 void OopMapBlocksBuilder::compact() {
4075 if (_nonstatic_oop_map_count <= 1) {
4076 return;
4077 }
4078 /*
4079 * Since field layout sneaks in oops before values, we will be able to condense
4080 * blocks. There is potential to compact between super, own refs and values
4081 * containing refs.
4082 *
4083 * Currently compaction is slightly limited due to values being 8 byte aligned.
4084 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4085 * and maybe it doesn't need to be.
4086 */
4087 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4088 (_sort_Fn)OopMapBlock::compare_offset);
4089 if (_nonstatic_oop_map_count < 2) {
4090 return;
4091 }
4092
4093 // Make a temp copy, and iterate through and copy back into the original
4094 ResourceMark rm;
4095 OopMapBlock* oop_maps_copy =
4096 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4097 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4098 copy(oop_maps_copy);
4099 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4100 unsigned int new_count = 1;
4101 oop_maps_copy++;
4102 while(oop_maps_copy < oop_maps_copy_end) {
4103 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4104 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4105 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4106 } else {
4107 nonstatic_oop_map++;
4108 new_count++;
4109 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4110 nonstatic_oop_map->set_count(oop_maps_copy->count());
4111 }
4112 oop_maps_copy++;
4113 }
4114 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4115 _nonstatic_oop_map_count = new_count;
4116 }
4117
4118 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4119 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4120 if (_nonstatic_oop_map_count > 0) {
4121 OopMapBlock* map = _nonstatic_oop_maps;
4122 OopMapBlock* last_map = last_oop_map();
4123 assert(map <= last_map, "Last less than first");
4124 while (map <= last_map) {
4125 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4126 map->offset() + map->offset_span() - heapOopSize, map->count());
4127 map++;
4128 }
4129 }
4130 }
4131
4132 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4133 print_on(st);
4134 }
4135
4136 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4137 assert(ik != nullptr, "invariant");
4138
4139 const InstanceKlass* const super = ik->super();
4140
4141 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4142 // in which case we don't have to register objects as finalizable
4143 if (!_has_empty_finalizer) {
4144 if (_has_finalizer ||
4145 (super != nullptr && super->has_finalizer())) {
4146 ik->set_has_finalizer();
4147 }
4148 }
4149
4150 #ifdef ASSERT
4151 bool f = false;
4152 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4153 vmSymbols::void_method_signature());
4154 if (InstanceKlass::is_finalization_enabled() &&
4155 (m != nullptr) && !m->is_empty_method()) {
4156 f = true;
4157 }
4158
4159 // Spec doesn't prevent agent from redefinition of empty finalizer.
4160 // Despite the fact that it's generally bad idea and redefined finalizer
4161 // will not work as expected we shouldn't abort vm in this case
4162 if (!ik->has_redefined_this_or_super()) {
4163 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4164 }
4165 #endif
4166
4167 // Check if this klass supports the java.lang.Cloneable interface
4168 if (vmClasses::Cloneable_klass_is_loaded()) {
4169 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4170 ik->set_is_cloneable();
4171 }
4172 }
4173
4174 // If it cannot be fast-path allocated, set a bit in the layout helper.
4175 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4176 assert(ik->size_helper() > 0, "layout_helper is initialized");
4177 if (ik->is_abstract() || ik->is_interface()
4178 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4179 || ik->size_helper() >= FastAllocateSizeLimit) {
4180 // Forbid fast-path allocation.
4181 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4182 ik->set_layout_helper(lh);
4183 }
4184
4185 // Propagate the AOT runtimeSetup method discovery
4186 if (_has_aot_runtime_setup_method) {
4187 ik->set_is_runtime_setup_required();
4188 if (log_is_enabled(Info, aot, init)) {
4189 ResourceMark rm;
4190 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4191 }
4192 }
4193 }
4194
4195 bool ClassFileParser::supports_inline_types() const {
4196 // Inline types are only supported by class file version 71.65535 and later
4197 return _major_version > JAVA_27_VERSION ||
4198 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4199 }
4200
4201 // utility methods for appending an array with check for duplicates
4202
4203 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4204 const Array<InstanceKlass*>* const ifs) {
4205 // iterate over new interfaces
4206 for (int i = 0; i < ifs->length(); i++) {
4207 InstanceKlass* const e = ifs->at(i);
4208 assert(e->is_klass() && e->is_interface(), "just checking");
4209 // add new interface
4210 result->append_if_missing(e);
4211 }
4212 }
4213
4214 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4215 Array<InstanceKlass*>* local_ifs,
4216 ClassLoaderData* loader_data,
4217 TRAPS) {
4218 assert(local_ifs != nullptr, "invariant");
4219 assert(loader_data != nullptr, "invariant");
4220
4221 // Compute maximum size for transitive interfaces
4222 int max_transitive_size = 0;
4223 int super_size = 0;
4224 // Add superclass transitive interfaces size
4225 if (super != nullptr) {
4226 super_size = super->transitive_interfaces()->length();
4227 max_transitive_size += super_size;
4228 }
4229 // Add local interfaces' super interfaces
4230 const int local_size = local_ifs->length();
4231 for (int i = 0; i < local_size; i++) {
4232 InstanceKlass* const l = local_ifs->at(i);
4233 max_transitive_size += l->transitive_interfaces()->length();
4234 }
4235 // Finally add local interfaces
4236 max_transitive_size += local_size;
4237 // Construct array
4238 if (max_transitive_size == 0) {
4239 // no interfaces, use canonicalized array
4240 return Universe::the_empty_instance_klass_array();
4241 } else if (max_transitive_size == super_size) {
4242 // no new local interfaces added, share superklass' transitive interface array
4243 return super->transitive_interfaces();
4244 } else if (max_transitive_size == local_size) {
4245 // only local interfaces added, share local interface array
4246 return local_ifs;
4247 } else {
4248 ResourceMark rm;
4249 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4250
4251 // Copy down from superclass
4252 if (super != nullptr) {
4253 append_interfaces(result, super->transitive_interfaces());
4254 }
4255
4256 // Copy down from local interfaces' superinterfaces
4257 for (int i = 0; i < local_size; i++) {
4258 InstanceKlass* const l = local_ifs->at(i);
4259 append_interfaces(result, l->transitive_interfaces());
4260 }
4261 // Finally add local interfaces
4262 append_interfaces(result, local_ifs);
4263
4264 // length will be less than the max_transitive_size if duplicates were removed
4265 const int length = result->length();
4266 assert(length <= max_transitive_size, "just checking");
4267
4268 Array<InstanceKlass*>* const new_result =
4269 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4270 for (int i = 0; i < length; i++) {
4271 InstanceKlass* const e = result->at(i);
4272 assert(e != nullptr, "just checking");
4273 new_result->at_put(i, e);
4274 }
4275 return new_result;
4276 }
4277 }
4278
4279 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4280 assert(this_klass != nullptr, "invariant");
4281 const InstanceKlass* const super = this_klass->super();
4282
4283 if (super != nullptr) {
4284 if (super->is_final()) {
4285 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4286 return;
4287 }
4288
4289 if (super->is_sealed()) {
4290 stringStream ss;
4291 ResourceMark rm(THREAD);
4292 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4293 classfile_icce_error(ss.as_string(), THREAD);
4294 return;
4295 }
4296 }
4297
4298 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4299 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4300 // for a value classes. So, it is treated as a special case for now.
4301 if (!this_klass->access_flags().is_identity_class() &&
4302 super->name() != vmSymbols::java_lang_Object() &&
4303 super->is_identity_class()) {
4304 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4305 return;
4306 }
4307
4308 Reflection::VerifyClassAccessResults vca_result =
4309 Reflection::verify_class_access(this_klass, super, false);
4310 if (vca_result != Reflection::ACCESS_OK) {
4311 ResourceMark rm(THREAD);
4312 char* msg = Reflection::verify_class_access_msg(this_klass,
4313 super,
4314 vca_result);
4315
4316 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4317 if (msg == nullptr) {
4318 bool same_module = (this_klass->module() == super->module());
4319 Exceptions::fthrow(
4320 THREAD_AND_LOCATION,
4321 vmSymbols::java_lang_IllegalAccessError(),
4322 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4323 this_klass->external_name(),
4324 super->is_abstract() ? "abstract " : "",
4325 super->external_name(),
4326 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4327 (same_module) ? "" : "; ",
4328 (same_module) ? "" : super->class_in_module_of_loader());
4329 } else {
4330 // Add additional message content.
4331 Exceptions::fthrow(
4332 THREAD_AND_LOCATION,
4333 vmSymbols::java_lang_IllegalAccessError(),
4334 "superclass access check failed: %s",
4335 msg);
4336 }
4337 }
4338 }
4339 }
4340
4341
4342 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4343 assert(this_klass != nullptr, "invariant");
4344 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4345 const int lng = local_interfaces->length();
4346 for (int i = lng - 1; i >= 0; i--) {
4347 InstanceKlass* const k = local_interfaces->at(i);
4348 assert (k != nullptr && k->is_interface(), "invalid interface");
4349
4350 if (k->is_sealed()) {
4351 stringStream ss;
4352 ResourceMark rm(THREAD);
4353 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4354 classfile_icce_error(ss.as_string(), THREAD);
4355 return;
4356 }
4357 }
4358
4359 Reflection::VerifyClassAccessResults vca_result =
4360 Reflection::verify_class_access(this_klass, k, false);
4361 if (vca_result != Reflection::ACCESS_OK) {
4362 ResourceMark rm(THREAD);
4363 char* msg = Reflection::verify_class_access_msg(this_klass,
4364 k,
4365 vca_result);
4366
4367 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4368 if (msg == nullptr) {
4369 bool same_module = (this_klass->module() == k->module());
4370 Exceptions::fthrow(
4371 THREAD_AND_LOCATION,
4372 vmSymbols::java_lang_IllegalAccessError(),
4373 "class %s cannot access its superinterface %s (%s%s%s)",
4374 this_klass->external_name(),
4375 k->external_name(),
4376 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4377 (same_module) ? "" : "; ",
4378 (same_module) ? "" : k->class_in_module_of_loader());
4379 return;
4380 } else {
4381 // Add additional message content.
4382 Exceptions::fthrow(
4383 THREAD_AND_LOCATION,
4384 vmSymbols::java_lang_IllegalAccessError(),
4385 "superinterface check failed: %s",
4386 msg);
4387 return;
4388 }
4389 }
4390 }
4391 }
4392
4393
4394 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4395 assert(this_klass != nullptr, "invariant");
4396 const Array<Method*>* const methods = this_klass->methods();
4397 const int num_methods = methods->length();
4398
4399 // go thru each method and check if it overrides a final method
4400 for (int index = 0; index < num_methods; index++) {
4401 const Method* const m = methods->at(index);
4402
4403 // skip private, static, and <init> methods
4404 if ((!m->is_private() && !m->is_static()) &&
4405 (m->name() != vmSymbols::object_initializer_name())) {
4406
4407 const Symbol* const name = m->name();
4408 const Symbol* const signature = m->signature();
4409 const InstanceKlass* k = this_klass->super();
4410 const Method* super_m = nullptr;
4411 while (k != nullptr) {
4412 // skip supers that don't have final methods.
4413 if (k->has_final_method()) {
4414 // lookup a matching method in the super class hierarchy
4415 super_m = k->lookup_method(name, signature);
4416 if (super_m == nullptr) {
4417 break; // didn't find any match; get out
4418 }
4419
4420 if (super_m->is_final() && !super_m->is_static() &&
4421 !super_m->access_flags().is_private()) {
4422 // matching method in super is final, and not static or private
4423 bool can_access = Reflection::verify_member_access(this_klass,
4424 super_m->method_holder(),
4425 super_m->method_holder(),
4426 super_m->access_flags(),
4427 false, false, CHECK);
4428 if (can_access) {
4429 // this class can access super final method and therefore override
4430 ResourceMark rm(THREAD);
4431 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4432 err_msg("class %s overrides final method %s.%s%s",
4433 this_klass->external_name(),
4434 super_m->method_holder()->external_name(),
4435 name->as_C_string(),
4436 signature->as_C_string()));
4437 }
4438 }
4439
4440 // continue to look from super_m's holder's super.
4441 k = super_m->method_holder()->super();
4442 continue;
4443 }
4444
4445 k = k->super();
4446 }
4447 }
4448 }
4449 }
4450
4451
4452 // assumes that this_klass is an interface
4453 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4454 assert(this_klass != nullptr, "invariant");
4455 assert(this_klass->is_interface(), "not an interface");
4456 const Array<Method*>* methods = this_klass->methods();
4457 const int num_methods = methods->length();
4458
4459 for (int index = 0; index < num_methods; index++) {
4460 const Method* const m = methods->at(index);
4461 // if m is static and not the init method, throw a verify error
4462 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4463 ResourceMark rm(THREAD);
4464
4465 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4466 Exceptions::fthrow(
4467 THREAD_AND_LOCATION,
4468 vmSymbols::java_lang_VerifyError(),
4469 "Illegal static method %s in interface %s",
4470 m->name()->as_C_string(),
4471 this_klass->external_name()
4472 );
4473 return;
4474 }
4475 }
4476 }
4477
4478 // utility methods for format checking
4479
4480 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4481 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4482 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4483 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4484 if (is_module) {
4485 ResourceMark rm(THREAD);
4486 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4487 Exceptions::fthrow(
4488 THREAD_AND_LOCATION,
4489 vmSymbols::java_lang_NoClassDefFoundError(),
4490 "%s is not a class because access_flag ACC_MODULE is set",
4491 _class_name->as_C_string());
4492 return;
4493 }
4494
4495 if (!_need_verify) { return; }
4496
4497 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4498 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4499 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4500 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4501 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4502 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4503 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4504 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final));
4505
4506 if ((is_abstract && is_final) ||
4507 (is_interface && !is_abstract) ||
4508 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4509 (!is_interface && major_gte_1_5 && is_annotation) ||
4510 (!valid_value_class)) {
4511 ResourceMark rm(THREAD);
4512 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4513 if (inner_name == nullptr && !is_anonymous_inner_class) {
4514 Exceptions::fthrow(
4515 THREAD_AND_LOCATION,
4516 vmSymbols::java_lang_ClassFormatError(),
4517 "Illegal class modifiers in class %s: 0x%X",
4518 _class_name->as_C_string(), flags
4519 );
4520 } else {
4521 if (is_anonymous_inner_class) {
4522 Exceptions::fthrow(
4523 THREAD_AND_LOCATION,
4524 vmSymbols::java_lang_ClassFormatError(),
4525 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4526 _class_name->as_C_string(), flags
4527 );
4528 } else {
4529 Exceptions::fthrow(
4530 THREAD_AND_LOCATION,
4531 vmSymbols::java_lang_ClassFormatError(),
4532 "Illegal class modifiers in inner class %s of class %s: 0x%X",
4533 inner_name->as_C_string(), _class_name->as_C_string(), flags
4534 );
4535 }
4536 }
4537 return;
4538 }
4539 }
4540
4541 static bool has_illegal_visibility(jint flags) {
4542 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4543 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4544 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4545
4546 return ((is_public && is_protected) ||
4547 (is_public && is_private) ||
4548 (is_protected && is_private));
4549 }
4550
4551 // A legal major_version.minor_version must be one of the following:
4552 //
4553 // Major_version >= 45 and major_version < 56, any minor_version.
4554 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4555 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4556 //
4557 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4558 ResourceMark rm(THREAD);
4559 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4560 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4561 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4562 class_name, major, minor, THREAD);
4563 return;
4564 }
4565
4566 if (major > max_version) {
4567 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4568 Exceptions::fthrow(
4569 THREAD_AND_LOCATION,
4570 vmSymbols::java_lang_UnsupportedClassVersionError(),
4571 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4572 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4573 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4574 return;
4575 }
4576
4577 if (major < JAVA_12_VERSION || minor == 0) {
4578 return;
4579 }
4580
4581 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4582 if (major != max_version) {
4583 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4584 Exceptions::fthrow(
4585 THREAD_AND_LOCATION,
4586 vmSymbols::java_lang_UnsupportedClassVersionError(),
4587 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4588 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4589 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4590 return;
4591 }
4592
4593 if (!Arguments::enable_preview()) {
4594 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4595 class_name, major, minor, THREAD);
4596 return;
4597 }
4598
4599 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4600 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4601 class_name, major, minor, THREAD);
4602 }
4603 }
4604
4605 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4606 AccessFlags class_access_flags,
4607 TRAPS) const {
4608 if (!_need_verify) { return; }
4609
4610 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4611 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4612 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4613 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4614 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4615 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4616 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4617 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4618 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4619 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4620
4621 const bool is_interface = class_access_flags.is_interface();
4622 const bool is_identity_class = class_access_flags.is_identity_class();
4623
4624 bool is_illegal = false;
4625 const char* error_msg = "";
4626
4627 // There is some overlap in the checks that apply, for example interface fields
4628 // must be static, static fields can't be strict, and therefore interfaces can't
4629 // have strict fields. So we don't have to check every possible invalid combination
4630 // individually as long as all are covered. Once we have found an illegal combination
4631 // we can stop checking.
4632
4633 if (!is_illegal) {
4634 if (is_interface) {
4635 if (!is_public || !is_static || !is_final || is_private ||
4636 is_protected || is_volatile || is_transient ||
4637 (major_gte_1_5 && is_enum)) {
4638 is_illegal = true;
4639 error_msg = "interface fields must be public, static and final, and may be synthetic";
4640 }
4641 } else { // not interface
4642 if (has_illegal_visibility(flags)) {
4643 is_illegal = true;
4644 error_msg = "invalid visibility flags for class field";
4645 } else if (is_final && is_volatile) {
4646 is_illegal = true;
4647 error_msg = "fields cannot be final and volatile";
4648 } else if (supports_inline_types()) {
4649 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4650 is_illegal = true;
4651 error_msg = "value class fields must be either non-static final and strict, or static";
4652 }
4653 }
4654 }
4655 }
4656
4657 if (is_illegal) {
4658 ResourceMark rm(THREAD);
4659 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4660 Exceptions::fthrow(
4661 THREAD_AND_LOCATION,
4662 vmSymbols::java_lang_ClassFormatError(),
4663 "Illegal field modifiers (%s) in class %s: 0x%X",
4664 error_msg, _class_name->as_C_string(), flags);
4665 return;
4666 }
4667 }
4668
4669 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4670 AccessFlags class_access_flags,
4671 const Symbol* name,
4672 TRAPS) const {
4673 if (!_need_verify) { return; }
4674
4675 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4676 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4677 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4678 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4679 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4680 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4681 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4682 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4683 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4684 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4685 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4686 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4687 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4688 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4689 const bool is_interface = class_access_flags.is_interface();
4690 const bool is_identity_class = class_access_flags.is_identity_class();
4691
4692 bool is_illegal = false;
4693 const char* class_note = "";
4694
4695 if (is_interface) {
4696 if (major_gte_8) {
4697 // Class file version is JAVA_8_VERSION or later Methods of
4698 // interfaces may set any of the flags except ACC_PROTECTED,
4699 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4700 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4701 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4702 (is_native || is_protected || is_final || is_synchronized) ||
4703 // If a specific method of a class or interface has its
4704 // ACC_ABSTRACT flag set, it must not have any of its
4705 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4706 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4707 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4708 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4709 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4710 is_illegal = true;
4711 }
4712 } else if (major_gte_1_5) {
4713 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4714 if (!is_public || is_private || is_protected || is_static || is_final ||
4715 is_synchronized || is_native || !is_abstract || is_strict) {
4716 is_illegal = true;
4717 }
4718 } else {
4719 // Class file version is pre-JAVA_1_5_VERSION
4720 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4721 is_illegal = true;
4722 }
4723 }
4724 } else { // not interface
4725 if (has_illegal_visibility(flags)) {
4726 is_illegal = true;
4727 } else {
4728 if (is_initializer) {
4729 if (is_static || is_final || is_synchronized || is_native ||
4730 is_abstract || (major_gte_1_5 && is_bridge)) {
4731 is_illegal = true;
4732 }
4733 } else { // not initializer
4734 if (!is_identity_class && is_synchronized && !is_static) {
4735 is_illegal = true;
4736 class_note = " (not an identity class)";
4737 } else {
4738 if (is_abstract) {
4739 if ((is_final || is_native || is_private || is_static ||
4740 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4741 is_illegal = true;
4742 }
4743 }
4744 }
4745 }
4746 }
4747 }
4748
4749 if (is_illegal) {
4750 ResourceMark rm(THREAD);
4751 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4752 Exceptions::fthrow(
4753 THREAD_AND_LOCATION,
4754 vmSymbols::java_lang_ClassFormatError(),
4755 "Method %s in class %s%s has illegal modifiers: 0x%X",
4756 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
4757 return;
4758 }
4759 }
4760
4761 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4762 int length,
4763 TRAPS) const {
4764 assert(_need_verify, "only called when _need_verify is true");
4765 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4766 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4767 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4768 }
4769 }
4770
4771 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4772 // In class names, '/' separates unqualified names. This is verified in this function also.
4773 // Method names also may not contain the characters '<' or '>', unless <init>
4774 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4775 // method. Because these names have been checked as special cases before
4776 // calling this method in verify_legal_method_name.
4777 //
4778 // This method is also called from the modular system APIs in modules.cpp
4779 // to verify the validity of module and package names.
4780 bool ClassFileParser::verify_unqualified_name(const char* name,
4781 unsigned int length,
4782 int type) {
4783 if (length == 0) return false; // Must have at least one char.
4784 for (const char* p = name; p != name + length; p++) {
4785 switch(*p) {
4786 case JVM_SIGNATURE_DOT:
4787 case JVM_SIGNATURE_ENDCLASS:
4788 case JVM_SIGNATURE_ARRAY:
4789 // do not permit '.', ';', or '['
4790 return false;
4791 case JVM_SIGNATURE_SLASH:
4792 // check for '//' or leading or trailing '/' which are not legal
4793 // unqualified name must not be empty
4794 if (type == ClassFileParser::LegalClass) {
4795 if (p == name || p+1 >= name+length ||
4796 *(p+1) == JVM_SIGNATURE_SLASH) {
4797 return false;
4798 }
4799 } else {
4800 return false; // do not permit '/' unless it's class name
4801 }
4802 break;
4803 case JVM_SIGNATURE_SPECIAL:
4804 case JVM_SIGNATURE_ENDSPECIAL:
4805 // do not permit '<' or '>' in method names
4806 if (type == ClassFileParser::LegalMethod) {
4807 return false;
4808 }
4809 }
4810 }
4811 return true;
4812 }
4813
4814 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4815 if (_loadable_descriptors == nullptr) return false;
4816 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4817 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4818 if (class_name == klass) return true;
4819 }
4820 return false;
4821 }
4822
4823 // Take pointer to a UTF8 byte string (not NUL-terminated).
4824 // Skip over the longest part of the string that could
4825 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4826 // Return a pointer to just past the fieldname.
4827 // Return null if no fieldname at all was found, or in the case of slash_ok
4828 // being true, we saw consecutive slashes (meaning we were looking for a
4829 // qualified path but found something that was badly-formed).
4830 static const char* skip_over_field_name(const char* const name,
4831 bool slash_ok,
4832 unsigned int length) {
4833 const char* p;
4834 jboolean last_is_slash = false;
4835 jboolean not_first_ch = false;
4836
4837 for (p = name; p != name + length; not_first_ch = true) {
4838 const char* old_p = p;
4839 jchar ch = *p;
4840 if (ch < 128) {
4841 p++;
4842 // quick check for ascii
4843 if ((ch >= 'a' && ch <= 'z') ||
4844 (ch >= 'A' && ch <= 'Z') ||
4845 (ch == '_' || ch == '$') ||
4846 (not_first_ch && ch >= '0' && ch <= '9')) {
4847 last_is_slash = false;
4848 continue;
4849 }
4850 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4851 if (last_is_slash) {
4852 return nullptr; // Don't permit consecutive slashes
4853 }
4854 last_is_slash = true;
4855 continue;
4856 }
4857 }
4858 else {
4859 jint unicode_ch;
4860 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4861 p = tmp_p;
4862 last_is_slash = false;
4863 // Check if ch is Java identifier start or is Java identifier part
4864 // 4672820: call java.lang.Character methods directly without generating separate tables.
4865 EXCEPTION_MARK;
4866 // return value
4867 JavaValue result(T_BOOLEAN);
4868 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4869 JavaCallArguments args;
4870 args.push_int(unicode_ch);
4871
4872 if (not_first_ch) {
4873 // public static boolean isJavaIdentifierPart(char ch);
4874 JavaCalls::call_static(&result,
4875 vmClasses::Character_klass(),
4876 vmSymbols::isJavaIdentifierPart_name(),
4877 vmSymbols::int_bool_signature(),
4878 &args,
4879 THREAD);
4880 } else {
4881 // public static boolean isJavaIdentifierStart(char ch);
4882 JavaCalls::call_static(&result,
4883 vmClasses::Character_klass(),
4884 vmSymbols::isJavaIdentifierStart_name(),
4885 vmSymbols::int_bool_signature(),
4886 &args,
4887 THREAD);
4888 }
4889 if (HAS_PENDING_EXCEPTION) {
4890 CLEAR_PENDING_EXCEPTION;
4891 return nullptr;
4892 }
4893 if(result.get_jboolean()) {
4894 continue;
4895 }
4896 }
4897 return (not_first_ch) ? old_p : nullptr;
4898 }
4899 return (not_first_ch && !last_is_slash) ? p : nullptr;
4900 }
4901
4902 // Take pointer to a UTF8 byte string (not NUL-terminated).
4903 // Skip over the longest part of the string that could
4904 // be taken as a field signature. Allow "void" if void_ok.
4905 // Return a pointer to just past the signature.
4906 // Return null if no legal signature is found.
4907 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4908 bool void_ok,
4909 unsigned int length,
4910 TRAPS) const {
4911 unsigned int array_dim = 0;
4912 while (length > 0) {
4913 switch (signature[0]) {
4914 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4915 case JVM_SIGNATURE_BOOLEAN:
4916 case JVM_SIGNATURE_BYTE:
4917 case JVM_SIGNATURE_CHAR:
4918 case JVM_SIGNATURE_SHORT:
4919 case JVM_SIGNATURE_INT:
4920 case JVM_SIGNATURE_FLOAT:
4921 case JVM_SIGNATURE_LONG:
4922 case JVM_SIGNATURE_DOUBLE:
4923 return signature + 1;
4924 case JVM_SIGNATURE_CLASS:
4925 {
4926 if (_major_version < JAVA_1_5_VERSION) {
4927 signature++;
4928 length--;
4929 // Skip over the class name if one is there
4930 const char* const p = skip_over_field_name(signature, true, length);
4931 assert(p == nullptr || p > signature, "must parse one character at least");
4932 // The next character better be a semicolon
4933 if (p != nullptr && // Parse of field name succeeded.
4934 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4935 p[0] == JVM_SIGNATURE_ENDCLASS) {
4936 return p + 1;
4937 }
4938 }
4939 else {
4940 // Skip leading 'L' and ignore first appearance of ';'
4941 signature++;
4942 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4943 // Format check signature
4944 if (c != nullptr) {
4945 int newlen = pointer_delta_as_int(c, (char*) signature);
4946 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4947 if (!legal) {
4948 classfile_parse_error("Class name is empty or contains illegal character "
4949 "in descriptor in class file %s",
4950 THREAD);
4951 return nullptr;
4952 }
4953 return signature + newlen + 1;
4954 }
4955 }
4956 return nullptr;
4957 }
4958 case JVM_SIGNATURE_ARRAY:
4959 array_dim++;
4960 if (array_dim > 255) {
4961 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4962 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4963 return nullptr;
4964 }
4965 // The rest of what's there better be a legal signature
4966 signature++;
4967 length--;
4968 void_ok = false;
4969 break;
4970 default:
4971 return nullptr;
4972 }
4973 }
4974 return nullptr;
4975 }
4976
4977 // Checks if name is a legal class name.
4978 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4979 if (!_need_verify) { return; }
4980
4981 assert(name->refcount() > 0, "symbol must be kept alive");
4982 char* bytes = (char*)name->bytes();
4983 unsigned int length = name->utf8_length();
4984 bool legal = false;
4985
4986 if (length > 0) {
4987 const char* p;
4988 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4989 p = skip_over_field_signature(bytes, false, length, CHECK);
4990 legal = (p != nullptr) && ((p - bytes) == (int)length);
4991 } else if (_major_version < JAVA_1_5_VERSION) {
4992 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4993 p = skip_over_field_name(bytes, true, length);
4994 legal = (p != nullptr) && ((p - bytes) == (int)length);
4995 }
4996 } else {
4997 // 4900761: relax the constraints based on JSR202 spec
4998 // Class names may be drawn from the entire Unicode character set.
4999 // Identifiers between '/' must be unqualified names.
5000 // The utf8 string has been verified when parsing cpool entries.
5001 legal = verify_unqualified_name(bytes, length, LegalClass);
5002 }
5003 }
5004 if (!legal) {
5005 ResourceMark rm(THREAD);
5006 assert(_class_name != nullptr, "invariant");
5007 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5008 Exceptions::fthrow(
5009 THREAD_AND_LOCATION,
5010 vmSymbols::java_lang_ClassFormatError(),
5011 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5012 _class_name->as_C_string()
5013 );
5014 return;
5015 }
5016 }
5017
5018 // Checks if name is a legal field name.
5019 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5020 if (!_need_verify) { return; }
5021
5022 char* bytes = (char*)name->bytes();
5023 unsigned int length = name->utf8_length();
5024 bool legal = false;
5025
5026 if (length > 0) {
5027 if (_major_version < JAVA_1_5_VERSION) {
5028 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5029 const char* p = skip_over_field_name(bytes, false, length);
5030 legal = (p != nullptr) && ((p - bytes) == (int)length);
5031 }
5032 } else {
5033 // 4881221: relax the constraints based on JSR202 spec
5034 legal = verify_unqualified_name(bytes, length, LegalField);
5035 }
5036 }
5037
5038 if (!legal) {
5039 ResourceMark rm(THREAD);
5040 assert(_class_name != nullptr, "invariant");
5041 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5042 Exceptions::fthrow(
5043 THREAD_AND_LOCATION,
5044 vmSymbols::java_lang_ClassFormatError(),
5045 "Illegal field name \"%.*s\" in class %s", length, bytes,
5046 _class_name->as_C_string()
5047 );
5048 return;
5049 }
5050 }
5051
5052 // Checks if name is a legal method name.
5053 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5054 if (!_need_verify) { return; }
5055
5056 assert(name != nullptr, "method name is null");
5057 char* bytes = (char*)name->bytes();
5058 unsigned int length = name->utf8_length();
5059 bool legal = false;
5060
5061 if (length > 0) {
5062 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5063 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5064 legal = true;
5065 }
5066 } else if (_major_version < JAVA_1_5_VERSION) {
5067 const char* p;
5068 p = skip_over_field_name(bytes, false, length);
5069 legal = (p != nullptr) && ((p - bytes) == (int)length);
5070 } else {
5071 // 4881221: relax the constraints based on JSR202 spec
5072 legal = verify_unqualified_name(bytes, length, LegalMethod);
5073 }
5074 }
5075
5076 if (!legal) {
5077 ResourceMark rm(THREAD);
5078 assert(_class_name != nullptr, "invariant");
5079 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5080 Exceptions::fthrow(
5081 THREAD_AND_LOCATION,
5082 vmSymbols::java_lang_ClassFormatError(),
5083 "Illegal method name \"%.*s\" in class %s", length, bytes,
5084 _class_name->as_C_string()
5085 );
5086 return;
5087 }
5088 }
5089
5090 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5091 const char* const bytes = (const char*)signature->bytes();
5092 const unsigned int length = signature->utf8_length();
5093 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5094
5095 if (p == nullptr || (p - bytes) != (int)length) {
5096 return false;
5097 }
5098 return true;
5099 }
5100
5101 // Checks if signature is a legal field signature.
5102 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5103 const Symbol* signature,
5104 TRAPS) const {
5105 if (!_need_verify) { return; }
5106
5107 if (!legal_field_signature(signature, THREAD)) {
5108 CLEAR_PENDING_EXCEPTION; // throw this exception instead
5109 throwIllegalSignature("Field", name, signature, CHECK);
5110 }
5111 }
5112
5113 // Check that the signature is compatible with the method name. For example,
5114 // check that <init> has a void signature.
5115 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5116 const Symbol* signature,
5117 TRAPS) const {
5118 if (!_need_verify) {
5119 return;
5120 }
5121
5122 // Class initializers cannot have args for class format version >= 51.
5123 if (name == vmSymbols::class_initializer_name() &&
5124 signature != vmSymbols::void_method_signature() &&
5125 _major_version >= JAVA_7_VERSION) {
5126 throwIllegalSignature("Method", name, signature, THREAD);
5127 return;
5128 }
5129
5130 int sig_length = signature->utf8_length();
5131 if (name->utf8_length() > 0 &&
5132 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5133 sig_length > 0 &&
5134 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5135 throwIllegalSignature("Method", name, signature, THREAD);
5136 }
5137 }
5138
5139 // Checks if signature is a legal method signature.
5140 // Returns number of parameters
5141 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5142 const Symbol* signature,
5143 TRAPS) const {
5144 if (!_need_verify) {
5145 // make sure caller's args_size will be less than 0 even for non-static
5146 // method so it will be recomputed in compute_size_of_parameters().
5147 return -2;
5148 }
5149
5150 unsigned int args_size = 0;
5151 const char* p = (const char*)signature->bytes();
5152 unsigned int length = signature->utf8_length();
5153 const char* nextp;
5154
5155 // The first character must be a '('
5156 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5157 length--;
5158 // Skip over legal field signatures
5159 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5160 while ((length > 0) && (nextp != nullptr)) {
5161 args_size++;
5162 if (p[0] == 'J' || p[0] == 'D') {
5163 args_size++;
5164 }
5165 length -= pointer_delta_as_int(nextp, p);
5166 p = nextp;
5167 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5168 }
5169 // The first non-signature thing better be a ')'
5170 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5171 length--;
5172 // Now we better just have a return value
5173 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5174 if (nextp && ((int)length == (nextp - p))) {
5175 return args_size;
5176 }
5177 }
5178 }
5179 // Report error
5180 throwIllegalSignature("Method", name, signature, THREAD);
5181 return 0;
5182 }
5183
5184 int ClassFileParser::static_field_size() const {
5185 assert(_layout_info != nullptr, "invariant");
5186 return _layout_info->_static_field_size;
5187 }
5188
5189 int ClassFileParser::total_oop_map_count() const {
5190 assert(_layout_info != nullptr, "invariant");
5191 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5192 }
5193
5194 jint ClassFileParser::layout_size() const {
5195 assert(_layout_info != nullptr, "invariant");
5196 return _layout_info->_instance_size;
5197 }
5198
5199 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5200 const Array<Method*>* methods) {
5201 assert(ik != nullptr, "invariant");
5202 assert(methods != nullptr, "invariant");
5203
5204 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5205 // (We used to do this lazily, but now we query it in Rewriter,
5206 // which is eagerly done for every method, so we might as well do it now,
5207 // when everything is fresh in memory.)
5208 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5209
5210 if (klass_id != vmSymbolID::NO_SID) {
5211 for (int j = 0; j < methods->length(); ++j) {
5212 Method* method = methods->at(j);
5213 method->init_intrinsic_id(klass_id);
5214
5215 if (CheckIntrinsics) {
5216 // Check if an intrinsic is defined for method 'method',
5217 // but the method is not annotated with @IntrinsicCandidate.
5218 if (method->intrinsic_id() != vmIntrinsics::_none &&
5219 !method->intrinsic_candidate()) {
5220 tty->print("Compiler intrinsic is defined for method [%s], "
5221 "but the method is not annotated with @IntrinsicCandidate.%s",
5222 method->name_and_sig_as_C_string(),
5223 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5224 );
5225 tty->cr();
5226 DEBUG_ONLY(vm_exit(1));
5227 }
5228 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5229 // but there is no intrinsic available for it.
5230 if (method->intrinsic_candidate() &&
5231 method->intrinsic_id() == vmIntrinsics::_none) {
5232 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5233 "but no compiler intrinsic is defined for the method.%s",
5234 method->name_and_sig_as_C_string(),
5235 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5236 );
5237 tty->cr();
5238 DEBUG_ONLY(vm_exit(1));
5239 }
5240 }
5241 } // end for
5242
5243 #ifdef ASSERT
5244 if (CheckIntrinsics) {
5245 // Check for orphan methods in the current class. A method m
5246 // of a class C is orphan if an intrinsic is defined for method m,
5247 // but class C does not declare m.
5248 // The check is potentially expensive, therefore it is available
5249 // only in debug builds.
5250
5251 for (auto id : EnumRange<vmIntrinsicID>{}) {
5252 if (vmIntrinsics::_compiledLambdaForm == id) {
5253 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5254 // generated for the JVM from a LambdaForm and therefore no method
5255 // is defined for it.
5256 continue;
5257 }
5258 if (vmIntrinsics::_blackhole == id) {
5259 // The _blackhole intrinsic is a special marker. No explicit method
5260 // is defined for it.
5261 continue;
5262 }
5263
5264 if (vmIntrinsics::class_for(id) == klass_id) {
5265 // Check if the current class contains a method with the same
5266 // name, flags, signature.
5267 bool match = false;
5268 for (int j = 0; j < methods->length(); ++j) {
5269 const Method* method = methods->at(j);
5270 if (method->intrinsic_id() == id) {
5271 match = true;
5272 break;
5273 }
5274 }
5275
5276 if (!match) {
5277 char buf[1000];
5278 tty->print("Compiler intrinsic is defined for method [%s], "
5279 "but the method is not available in class [%s].%s",
5280 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5281 ik->name()->as_C_string(),
5282 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5283 );
5284 tty->cr();
5285 DEBUG_ONLY(vm_exit(1));
5286 }
5287 }
5288 } // end for
5289 } // CheckIntrinsics
5290 #endif // ASSERT
5291 }
5292 }
5293
5294 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5295 const ClassInstanceInfo& cl_inst_info,
5296 TRAPS) {
5297 if (_klass != nullptr) {
5298 return _klass;
5299 }
5300
5301 InstanceKlass* const ik =
5302 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5303
5304 if (is_hidden()) {
5305 mangle_hidden_class_name(ik);
5306 }
5307
5308 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5309
5310 assert(_klass == ik, "invariant");
5311 return ik;
5312 }
5313
5314 void ClassFileParser::create_acmp_maps(InstanceKlass* ik, TRAPS) {
5315 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5316 // Current format of acmp maps:
5317 // All maps are stored contiguously in a single int array because it might
5318 // be too early to instantiate an Object array (to be investigated)
5319 // Format is:
5320 // [number_of_nonoop_entries][offset0][size0][offset1][size1]...[oop_offset0][oop_offset1]...
5321 // ^ ^
5322 // | |
5323 // --------------------- Pair of integer describing a segment of
5324 // contiguous non-oop fields
5325 // First element is the number of segment of contiguous non-oop fields
5326 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5327 // the offset then the size.
5328 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5329 // per oop field, containing the offset of the field.
5330 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5331 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5332 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1;
5333
5334 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK);
5335 typeArrayHandle map_h(THREAD, map);
5336 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK);
5337
5338 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5339 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length());
5340 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5341 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5342 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5343
5344 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data.
5345 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5346 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5347 }
5348 int oop_map_start = nonoop_acmp_map_size + 1;
5349 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5350 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5351 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5352 }
5353 assert(acmp_maps_array->length() == map_h->length(), "sanity");
5354 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5355 ik->set_acmp_maps_array(acmp_maps_array);
5356 }
5357
5358 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5359 bool changed_by_loadhook,
5360 const ClassInstanceInfo& cl_inst_info,
5361 TRAPS) {
5362 assert(ik != nullptr, "invariant");
5363
5364 // Set name and CLD before adding to CLD
5365 ik->set_class_loader_data(_loader_data);
5366 ik->set_class_loader_type();
5367 ik->set_name(_class_name);
5368
5369 // Add all classes to our internal class loader list here,
5370 // including classes in the bootstrap (null) class loader.
5371 const bool publicize = !is_internal();
5372
5373 _loader_data->add_class(ik, publicize);
5374
5375 set_klass_to_deallocate(ik);
5376
5377 assert(_layout_info != nullptr, "invariant");
5378 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5379 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5380 "sanity");
5381
5382 assert(ik->is_instance_klass(), "sanity");
5383 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5384
5385 // Fill in information already parsed
5386 ik->set_should_verify_class(_need_verify);
5387
5388 // Not yet: supers are done below to support the new subtype-checking fields
5389 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5390 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5391 ik->set_has_strict_static_fields(_has_strict_static_fields);
5392
5393 if (_layout_info->_is_naturally_atomic) {
5394 ik->set_is_naturally_atomic();
5395 }
5396
5397 if (_layout_info->_must_be_atomic) {
5398 ik->set_must_be_atomic();
5399 }
5400
5401 ik->set_static_oop_field_count(_static_oop_count);
5402
5403 // this transfers ownership of a lot of arrays from
5404 // the parser onto the InstanceKlass*
5405 apply_parsed_class_metadata(ik, _java_fields_count);
5406
5407 // can only set dynamic nest-host after static nest information is set
5408 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5409 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5410 }
5411
5412 // note that is not safe to use the fields in the parser from this point on
5413 assert(nullptr == _cp, "invariant");
5414 assert(nullptr == _fieldinfo_stream, "invariant");
5415 assert(nullptr == _fieldinfo_search_table, "invariant");
5416 assert(nullptr == _fields_status, "invariant");
5417 assert(nullptr == _methods, "invariant");
5418 assert(nullptr == _inner_classes, "invariant");
5419 assert(nullptr == _nest_members, "invariant");
5420 assert(nullptr == _loadable_descriptors, "invariant");
5421 assert(nullptr == _combined_annotations, "invariant");
5422 assert(nullptr == _record_components, "invariant");
5423 assert(nullptr == _permitted_subclasses, "invariant");
5424 assert(nullptr == _inline_layout_info_array, "invariant");
5425
5426 if (_has_localvariable_table) {
5427 ik->set_has_localvariable_table(true);
5428 }
5429
5430 if (_has_final_method) {
5431 ik->set_has_final_method();
5432 }
5433
5434 ik->copy_method_ordering(_method_ordering, CHECK);
5435 // The InstanceKlass::_methods_jmethod_ids cache
5436 // is managed on the assumption that the initial cache
5437 // size is equal to the number of methods in the class. If
5438 // that changes, then InstanceKlass::idnum_can_increment()
5439 // has to be changed accordingly.
5440 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5441
5442 ik->set_this_class_index(_this_class_index);
5443
5444 if (_is_hidden) {
5445 // _this_class_index is a CONSTANT_Class entry that refers to this
5446 // hidden class itself. If this class needs to refer to its own methods
5447 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5448 // _this_class_index. However, because this class is hidden (it's
5449 // not stored in SystemDictionary), _this_class_index cannot be resolved
5450 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5451 // Therefore, we must eagerly resolve _this_class_index now.
5452 ik->constants()->klass_at_put(_this_class_index, ik);
5453 }
5454
5455 ik->set_minor_version(_minor_version);
5456 ik->set_major_version(_major_version);
5457 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5458 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5459
5460 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5461
5462 // Set PackageEntry for this_klass
5463 oop cl = ik->class_loader();
5464 Handle clh = Handle(THREAD, cl);
5465 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5466 ik->set_package(cld, nullptr, CHECK);
5467
5468 const Array<Method*>* const methods = ik->methods();
5469 assert(methods != nullptr, "invariant");
5470 const int methods_len = methods->length();
5471
5472 check_methods_for_intrinsics(ik, methods);
5473
5474 // Fill in field values obtained by parse_classfile_attributes
5475 if (_parsed_annotations->has_any_annotations())
5476 _parsed_annotations->apply_to(ik);
5477
5478 apply_parsed_class_attributes(ik);
5479
5480 // Miranda methods
5481 if ((_num_miranda_methods > 0) ||
5482 // if this class introduced new miranda methods or
5483 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5484 // super class exists and this class inherited miranda methods
5485 ) {
5486 ik->set_has_miranda_methods(); // then set a flag
5487 }
5488
5489 // Fill in information needed to compute superclasses.
5490 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5491 ik->set_transitive_interfaces(_transitive_interfaces);
5492 ik->set_local_interfaces(_local_interfaces);
5493 _transitive_interfaces = nullptr;
5494 _local_interfaces = nullptr;
5495
5496 // Initialize itable offset tables
5497 klassItable::setup_itable_offset_table(ik);
5498
5499 // Compute transitive closure of interfaces this class implements
5500 // Do final class setup
5501 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5502 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5503 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5504 }
5505
5506 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5507 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5508 ik->set_has_contended_annotations(true);
5509 }
5510
5511 // Fill in has_finalizer and layout_helper
5512 set_precomputed_flags(ik);
5513
5514 // check if this class can access its super class
5515 check_super_class_access(ik, CHECK);
5516
5517 // check if this class can access its superinterfaces
5518 check_super_interface_access(ik, CHECK);
5519
5520 // check if this class overrides any final method
5521 check_final_method_override(ik, CHECK);
5522
5523 // reject static interface methods prior to Java 8
5524 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5525 check_illegal_static_method(ik, CHECK);
5526 }
5527
5528 // Obtain this_klass' module entry
5529 ModuleEntry* module_entry = ik->module();
5530 assert(module_entry != nullptr, "module_entry should always be set");
5531
5532 // Obtain java.lang.Module
5533 Handle module_handle(THREAD, module_entry->module_oop());
5534
5535 // Allocate mirror and initialize static fields
5536 java_lang_Class::create_mirror(ik,
5537 Handle(THREAD, _loader_data->class_loader()),
5538 module_handle,
5539 _protection_domain,
5540 cl_inst_info.class_data(),
5541 CHECK);
5542
5543 assert(_all_mirandas != nullptr, "invariant");
5544
5545 // Generate any default methods - default methods are public interface methods
5546 // that have a default implementation. This is new with Java 8.
5547 if (_has_nonstatic_concrete_methods) {
5548 DefaultMethods::generate_default_methods(ik,
5549 _all_mirandas,
5550 CHECK);
5551 }
5552
5553 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5554 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5555 !module_entry->has_default_read_edges()) {
5556 if (!module_entry->set_has_default_read_edges()) {
5557 // We won a potential race
5558 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5559 }
5560 }
5561
5562 if (is_inline_type()) {
5563 InlineKlass* vk = InlineKlass::cast(ik);
5564 vk->set_payload_alignment(_layout_info->_payload_alignment);
5565 vk->set_payload_offset(_layout_info->_payload_offset);
5566 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5567 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5568 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5569 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5570 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5571 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5572 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5573 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5574 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5575 vk->initialize_calling_convention(CHECK);
5576 }
5577
5578 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5579 && _class_name != vmSymbols::java_lang_Object()) {
5580 // Both abstract and concrete value classes need a field map for acmp
5581 create_acmp_maps(ik, CHECK);
5582 }
5583
5584 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5585
5586 if (!is_internal()) {
5587 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5588 if (CDSConfig::is_dumping_archive()) {
5589 SystemDictionaryShared::check_code_source(ik, _stream);
5590 }
5591
5592 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5593 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5594 log_is_enabled(Info, class, preview)) {
5595 ResourceMark rm;
5596 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5597 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5598 }
5599
5600 if (log_is_enabled(Debug, class, resolve)) {
5601 ResourceMark rm;
5602 // print out the superclass.
5603 const char * from = ik->external_name();
5604 if (ik->super() != nullptr) {
5605 log_debug(class, resolve)("%s %s (super)",
5606 from,
5607 ik->super()->external_name());
5608 }
5609 // print out each of the interface classes referred to by this class.
5610 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5611 if (local_interfaces != nullptr) {
5612 const int length = local_interfaces->length();
5613 for (int i = 0; i < length; i++) {
5614 const InstanceKlass* const k = local_interfaces->at(i);
5615 const char * to = k->external_name();
5616 log_debug(class, resolve)("%s %s (interface)", from, to);
5617 }
5618 }
5619 }
5620 }
5621
5622 // If we reach here, all is well.
5623 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5624 // in order for it to not be destroyed in the ClassFileParser destructor.
5625 set_klass_to_deallocate(nullptr);
5626
5627 // it's official
5628 set_klass(ik);
5629
5630 DEBUG_ONLY(ik->verify();)
5631 }
5632
5633 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5634 // Decrement the refcount in the old name, since we're clobbering it.
5635 _class_name->decrement_refcount();
5636
5637 _class_name = new_class_name;
5638 // Increment the refcount of the new name.
5639 // Now the ClassFileParser owns this name and will decrement in
5640 // the destructor.
5641 _class_name->increment_refcount();
5642 }
5643
5644 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5645 Symbol* name,
5646 ClassLoaderData* loader_data,
5647 const ClassLoadInfo* cl_info,
5648 Publicity pub_level,
5649 TRAPS) :
5650 _stream(stream),
5651 _class_name(nullptr),
5652 _loader_data(loader_data),
5653 _is_hidden(cl_info->is_hidden()),
5654 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5655 _orig_cp_size(0),
5656 _static_oop_count(0),
5657 _super_klass(),
5658 _cp(nullptr),
5659 _fieldinfo_stream(nullptr),
5660 _fieldinfo_search_table(nullptr),
5661 _fields_status(nullptr),
5662 _methods(nullptr),
5663 _inner_classes(nullptr),
5664 _nest_members(nullptr),
5665 _nest_host(0),
5666 _permitted_subclasses(nullptr),
5667 _loadable_descriptors(nullptr),
5668 _record_components(nullptr),
5669 _local_interfaces(nullptr),
5670 _transitive_interfaces(nullptr),
5671 _combined_annotations(nullptr),
5672 _class_annotations(nullptr),
5673 _class_type_annotations(nullptr),
5674 _fields_annotations(nullptr),
5675 _fields_type_annotations(nullptr),
5676 _klass(nullptr),
5677 _klass_to_deallocate(nullptr),
5678 _parsed_annotations(nullptr),
5679 _layout_info(nullptr),
5680 _inline_layout_info_array(nullptr),
5681 _temp_field_info(nullptr),
5682 _method_ordering(nullptr),
5683 _all_mirandas(nullptr),
5684 _vtable_size(0),
5685 _itable_size(0),
5686 _num_miranda_methods(0),
5687 _protection_domain(cl_info->protection_domain()),
5688 _access_flags(),
5689 _pub_level(pub_level),
5690 _bad_constant_seen(0),
5691 _synthetic_flag(false),
5692 _sde_length(false),
5693 _sde_buffer(nullptr),
5694 _sourcefile_index(0),
5695 _generic_signature_index(0),
5696 _major_version(0),
5697 _minor_version(0),
5698 _this_class_index(0),
5699 _super_class_index(0),
5700 _itfs_len(0),
5701 _java_fields_count(0),
5702 _need_verify(false),
5703 _has_nonstatic_concrete_methods(false),
5704 _declares_nonstatic_concrete_methods(false),
5705 _has_localvariable_table(false),
5706 _has_final_method(false),
5707 _has_contended_fields(false),
5708 _has_aot_runtime_setup_method(false),
5709 _has_strict_static_fields(false),
5710 _is_naturally_atomic(false),
5711 _must_be_atomic(true),
5712 _has_loosely_consistent_annotation(false),
5713 _has_finalizer(false),
5714 _has_empty_finalizer(false),
5715 _max_bootstrap_specifier_index(-1) {
5716
5717 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5718 _class_name->increment_refcount();
5719
5720 assert(_loader_data != nullptr, "invariant");
5721 assert(stream != nullptr, "invariant");
5722 assert(_stream != nullptr, "invariant");
5723 assert(_stream->buffer() == _stream->current(), "invariant");
5724 assert(_class_name != nullptr, "invariant");
5725 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5726
5727 // Figure out whether we can skip format checking (matching classic VM behavior)
5728 // Always verify CFLH bytes from the user agents.
5729 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5730
5731 // synch back verification state to stream to check for truncation.
5732 stream->set_need_verify(_need_verify);
5733
5734 parse_stream(stream, CHECK);
5735
5736 post_process_parsed_stream(stream, _cp, CHECK);
5737 }
5738
5739 void ClassFileParser::clear_class_metadata() {
5740 // metadata created before the instance klass is created. Must be
5741 // deallocated if classfile parsing returns an error.
5742 _cp = nullptr;
5743 _fieldinfo_stream = nullptr;
5744 _fieldinfo_search_table = nullptr;
5745 _fields_status = nullptr;
5746 _methods = nullptr;
5747 _inner_classes = nullptr;
5748 _nest_members = nullptr;
5749 _permitted_subclasses = nullptr;
5750 _loadable_descriptors = nullptr;
5751 _combined_annotations = nullptr;
5752 _class_annotations = _class_type_annotations = nullptr;
5753 _fields_annotations = _fields_type_annotations = nullptr;
5754 _record_components = nullptr;
5755 _inline_layout_info_array = nullptr;
5756 }
5757
5758 // Destructor to clean up
5759 ClassFileParser::~ClassFileParser() {
5760 _class_name->decrement_refcount();
5761
5762 if (_cp != nullptr) {
5763 MetadataFactory::free_metadata(_loader_data, _cp);
5764 }
5765
5766 if (_fieldinfo_stream != nullptr) {
5767 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5768 }
5769 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5770
5771 if (_fields_status != nullptr) {
5772 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5773 }
5774
5775 if (_inline_layout_info_array != nullptr) {
5776 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5777 }
5778
5779 if (_methods != nullptr) {
5780 // Free methods
5781 InstanceKlass::deallocate_methods(_loader_data, _methods);
5782 }
5783
5784 // beware of the Universe::empty_blah_array!!
5785 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5786 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5787 }
5788
5789 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5790 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5791 }
5792
5793 if (_record_components != nullptr) {
5794 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5795 }
5796
5797 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5798 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5799 }
5800
5801 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5802 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5803 }
5804
5805 // Free interfaces
5806 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5807 _local_interfaces, _transitive_interfaces);
5808
5809 if (_combined_annotations != nullptr) {
5810 // After all annotations arrays have been created, they are installed into the
5811 // Annotations object that will be assigned to the InstanceKlass being created.
5812
5813 // Deallocate the Annotations object and the installed annotations arrays.
5814 _combined_annotations->deallocate_contents(_loader_data);
5815
5816 // If the _combined_annotations pointer is non-null,
5817 // then the other annotations fields should have been cleared.
5818 assert(_class_annotations == nullptr, "Should have been cleared");
5819 assert(_class_type_annotations == nullptr, "Should have been cleared");
5820 assert(_fields_annotations == nullptr, "Should have been cleared");
5821 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5822 } else {
5823 // If the annotations arrays were not installed into the Annotations object,
5824 // then they have to be deallocated explicitly.
5825 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5826 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5827 Annotations::free_contents(_loader_data, _fields_annotations);
5828 Annotations::free_contents(_loader_data, _fields_type_annotations);
5829 }
5830
5831 clear_class_metadata();
5832 _transitive_interfaces = nullptr;
5833 _local_interfaces = nullptr;
5834
5835 // deallocate the klass if already created. Don't directly deallocate, but add
5836 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5837 // at a safepoint.
5838 if (_klass_to_deallocate != nullptr) {
5839 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5840 }
5841 }
5842
5843 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5844 TRAPS) {
5845
5846 assert(stream != nullptr, "invariant");
5847 assert(_class_name != nullptr, "invariant");
5848
5849 // BEGIN STREAM PARSING
5850 stream->guarantee_more(8, CHECK); // magic, major, minor
5851 // Magic value
5852 const u4 magic = stream->get_u4_fast();
5853 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5854 "Incompatible magic value %u in class file %s",
5855 magic, CHECK);
5856
5857 // Version numbers
5858 _minor_version = stream->get_u2_fast();
5859 _major_version = stream->get_u2_fast();
5860
5861 // Check version numbers - we check this even with verifier off
5862 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5863
5864 stream->guarantee_more(3, CHECK); // length, first cp tag
5865 u2 cp_size = stream->get_u2_fast();
5866
5867 guarantee_property(
5868 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5869 cp_size, CHECK);
5870
5871 _orig_cp_size = cp_size;
5872 if (is_hidden()) { // Add a slot for hidden class name.
5873 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK);
5874 cp_size++;
5875 }
5876
5877 _cp = ConstantPool::allocate(_loader_data,
5878 cp_size,
5879 CHECK);
5880
5881 ConstantPool* const cp = _cp;
5882
5883 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5884
5885 assert(cp_size == (u2)cp->length(), "invariant");
5886
5887 // ACCESS FLAGS
5888 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5889
5890 // Access flags
5891 u2 flags;
5892 // JVM_ACC_MODULE is defined in JDK-9 and later.
5893 if (_major_version >= JAVA_9_VERSION) {
5894 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5895 } else {
5896 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5897 }
5898
5899 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5900 // Set abstract bit for old class files for backward compatibility
5901 flags |= JVM_ACC_ABSTRACT;
5902 }
5903
5904 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5905 if (!supports_inline_types()) {
5906 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5907 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5908 if (!is_module && !is_interface) {
5909 flags |= JVM_ACC_IDENTITY;
5910 }
5911 }
5912
5913 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5914
5915 short bad_constant = class_bad_constant_seen();
5916 if (bad_constant != 0) {
5917 // Do not throw CFE until after the access_flags are checked because if
5918 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5919 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5920 return;
5921 }
5922
5923 _access_flags.set_flags(flags);
5924
5925 // This class and superclass
5926 _this_class_index = stream->get_u2_fast();
5927 guarantee_property(
5928 valid_cp_range(_this_class_index, cp_size) &&
5929 cp->tag_at(_this_class_index).is_unresolved_klass(),
5930 "Invalid this class index %u in constant pool in class file %s",
5931 _this_class_index, CHECK);
5932
5933 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5934 assert(class_name_in_cp != nullptr, "class_name can't be null");
5935
5936 // Don't need to check whether this class name is legal or not.
5937 // It has been checked when constant pool is parsed.
5938 // However, make sure it is not an array type.
5939 if (_need_verify) {
5940 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5941 "Bad class name in class file %s",
5942 CHECK);
5943 }
5944
5945 #ifdef ASSERT
5946 // Basic sanity checks
5947 if (_is_hidden) {
5948 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5949 }
5950 #endif
5951
5952 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5953
5954 if (_is_hidden) {
5955 assert(_class_name != nullptr, "Unexpected null _class_name");
5956 #ifdef ASSERT
5957 if (_need_verify) {
5958 verify_legal_class_name(_class_name, CHECK);
5959 }
5960 #endif
5961
5962 } else {
5963 // Check if name in class file matches given name
5964 if (_class_name != class_name_in_cp) {
5965 if (_class_name != vmSymbols::unknown_class_name()) {
5966 ResourceMark rm(THREAD);
5967 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5968 Exceptions::fthrow(THREAD_AND_LOCATION,
5969 vmSymbols::java_lang_NoClassDefFoundError(),
5970 "%s (wrong name: %s)",
5971 _class_name->as_C_string(),
5972 class_name_in_cp->as_C_string()
5973 );
5974 return;
5975 } else {
5976 // The class name was not known by the caller so we set it from
5977 // the value in the CP.
5978 update_class_name(class_name_in_cp);
5979 }
5980 // else nothing to do: the expected class name matches what is in the CP
5981 }
5982 }
5983
5984 // Verification prevents us from creating names with dots in them, this
5985 // asserts that that's the case.
5986 assert(is_internal_format(_class_name), "external class name format used internally");
5987
5988 if (!is_internal()) {
5989 LogTarget(Debug, class, preorder) lt;
5990 if (lt.is_enabled()){
5991 ResourceMark rm(THREAD);
5992 LogStream ls(lt);
5993 ls.print("%s", _class_name->as_klass_external_name());
5994 if (stream->source() != nullptr) {
5995 ls.print(" source: %s", stream->source());
5996 }
5997 ls.cr();
5998 }
5999 }
6000
6001 // SUPERKLASS
6002 _super_class_index = stream->get_u2_fast();
6003 check_super_class(cp,
6004 _super_class_index,
6005 _need_verify,
6006 CHECK);
6007
6008 // Interfaces
6009 _itfs_len = stream->get_u2_fast();
6010 parse_interfaces(stream,
6011 _itfs_len,
6012 cp,
6013 &_has_nonstatic_concrete_methods,
6014 CHECK);
6015
6016 assert(_local_interfaces != nullptr, "invariant");
6017
6018 // Fields (offsets are filled in later)
6019 parse_fields(stream,
6020 _access_flags,
6021 cp,
6022 cp_size,
6023 &_java_fields_count,
6024 CHECK);
6025
6026 assert(_temp_field_info != nullptr, "invariant");
6027
6028 // Methods
6029 parse_methods(stream,
6030 _access_flags.is_interface(),
6031 &_has_localvariable_table,
6032 &_has_final_method,
6033 &_declares_nonstatic_concrete_methods,
6034 CHECK);
6035
6036 assert(_methods != nullptr, "invariant");
6037
6038 if (_declares_nonstatic_concrete_methods) {
6039 _has_nonstatic_concrete_methods = true;
6040 }
6041
6042 // Additional attributes/annotations
6043 _parsed_annotations = new ClassAnnotationCollector();
6044 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6045
6046 assert(_inner_classes != nullptr, "invariant");
6047
6048 // Finalize the Annotations metadata object,
6049 // now that all annotation arrays have been created.
6050 create_combined_annotations(CHECK);
6051
6052 // Make sure this is the end of class file stream
6053 guarantee_property(stream->at_eos(),
6054 "Extra bytes at the end of class file %s",
6055 CHECK);
6056
6057 // all bytes in stream read and parsed
6058 }
6059
6060 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6061 ResourceMark rm;
6062 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6063 // use a '/' because that confuses finding the class's package. Also, can't
6064 // use an illegal char such as ';' because that causes serialization issues
6065 // and issues with hidden classes that create their own hidden classes.
6066 char addr_buf[20];
6067 if (CDSConfig::is_dumping_static_archive()) {
6068 // We want stable names for the archived hidden classes (only for static
6069 // archive for now). Spaces under default_SharedBaseAddress() will be
6070 // occupied by the archive at run time, so we know that no dynamically
6071 // loaded InstanceKlass will be placed under there.
6072 static volatile size_t counter = 0;
6073 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6074 size_t new_id = AtomicAccess::add(&counter, (size_t)1);
6075 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
6076 } else {
6077 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6078 }
6079 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6080 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6081 jio_snprintf(new_name, new_name_len, "%s+%s",
6082 _class_name->as_C_string(), addr_buf);
6083 update_class_name(SymbolTable::new_symbol(new_name));
6084
6085 // Add a Utf8 entry containing the hidden name.
6086 assert(_class_name != nullptr, "Unexpected null _class_name");
6087 int hidden_index = _orig_cp_size; // this is an extra slot we added
6088 _cp->symbol_at_put(hidden_index, _class_name);
6089
6090 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6091 // We have to update the resolved_klass_index and the name_index together
6092 // so extract the existing resolved_klass_index first.
6093 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6094 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6095 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6096 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6097 "Bad name_index");
6098 }
6099
6100 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6101 ConstantPool* cp,
6102 TRAPS) {
6103 assert(stream != nullptr, "invariant");
6104 assert(stream->at_eos(), "invariant");
6105 assert(cp != nullptr, "invariant");
6106 assert(_loader_data != nullptr, "invariant");
6107
6108 if (_class_name == vmSymbols::java_lang_Object()) {
6109 precond(_super_class_index == 0);
6110 precond(_super_klass == nullptr);
6111 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6112 "java.lang.Object cannot implement an interface in class file %s",
6113 CHECK);
6114 } else {
6115 // Set _super_klass after class file is parsed and format is checked
6116 assert(_super_class_index > 0, "any class other than Object must have a super class");
6117 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6118 if (_access_flags.is_interface()) {
6119 // Before attempting to resolve the superclass, check for class format
6120 // errors not checked yet.
6121 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6122 "Interfaces must have java.lang.Object as superclass in class file %s",
6123 CHECK);
6124 }
6125 Handle loader(THREAD, _loader_data->class_loader());
6126 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6127 // fast path to avoid lookup
6128 _super_klass = vmClasses::Object_klass();
6129 } else {
6130 _super_klass = (const InstanceKlass*)
6131 SystemDictionary::resolve_super_or_fail(_class_name,
6132 super_class_name,
6133 loader,
6134 true,
6135 CHECK);
6136 }
6137 }
6138
6139 if (_super_klass != nullptr) {
6140 if (_super_klass->is_interface()) {
6141 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6142 return;
6143 }
6144
6145 if (_super_klass->is_final()) {
6146 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6147 return;
6148 }
6149
6150 if (Arguments::is_valhalla_enabled()) {
6151 // If this class is an value class, its super class cannot be an identity class unless it is java.lang.Object.
6152 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() &&
6153 _super_klass != vmClasses::Object_klass()) {
6154 ResourceMark rm(THREAD);
6155 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6156 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string()));
6157 }
6158 }
6159
6160 if (_super_klass->has_nonstatic_concrete_methods()) {
6161 _has_nonstatic_concrete_methods = true;
6162 }
6163 }
6164
6165 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6166 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6167 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6168 _class_name->as_klass_external_name()));
6169 }
6170
6171 // Determining if the class allows tearing or not (default is not)
6172 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6173 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6174 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6175 // Conditions above are not sufficient to determine atomicity requirements,
6176 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6177 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6178 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6179 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6180 _must_be_atomic = false;
6181 }
6182 // Apply VM options override
6183 if (*ForceNonTearable != '\0') {
6184 // Allow a command line switch to force the same atomicity property:
6185 const char* class_name_str = _class_name->as_C_string();
6186 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6187 _must_be_atomic = true;
6188 }
6189 }
6190 }
6191
6192 // Compute the transitive list of all unique interfaces implemented by this class
6193 _transitive_interfaces =
6194 compute_transitive_interfaces(_super_klass,
6195 _local_interfaces,
6196 _loader_data,
6197 CHECK);
6198
6199 assert(_transitive_interfaces != nullptr, "invariant");
6200
6201 // sort methods
6202 _method_ordering = sort_methods(_methods);
6203
6204 _all_mirandas = new GrowableArray<Method*>(20);
6205
6206 Handle loader(THREAD, _loader_data->class_loader());
6207 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6208 &_num_miranda_methods,
6209 _all_mirandas,
6210 _super_klass,
6211 _methods,
6212 _access_flags,
6213 _major_version,
6214 loader,
6215 _class_name,
6216 _local_interfaces);
6217
6218 // Size of Java itable (in words)
6219 _itable_size = is_interface() ? 0 :
6220 klassItable::compute_itable_size(_transitive_interfaces);
6221
6222 assert(_parsed_annotations != nullptr, "invariant");
6223
6224 if (Arguments::is_valhalla_enabled()) {
6225 fetch_field_classes(cp, CHECK);
6226 }
6227
6228 _layout_info = new FieldLayoutInfo();
6229 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6230 _parsed_annotations->is_contended(), is_inline_type(),
6231 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6232 _must_be_atomic, _layout_info, _inline_layout_info_array);
6233 lb.build_layout();
6234
6235 // If it turned out that we didn't inline any of the fields, we deallocate
6236 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6237 // transferred to the allocated InstanceKlass.
6238 if (_inline_layout_info_array != nullptr && !_layout_info->_has_inlined_fields) {
6239 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6240 _inline_layout_info_array = nullptr;
6241 }
6242
6243 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6244 _fieldinfo_stream =
6245 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6246 injected_fields_count, loader_data(), CHECK);
6247 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6248 _fields_status =
6249 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6250 FieldStatus(0), CHECK);
6251
6252 // Strict static fields track initialization status from the beginning of time.
6253 // After this class runs <clinit>, they will be verified as being "not unset".
6254 // See Step 8 of InstanceKlass::initialize_impl.
6255 if (_has_strict_static_fields) {
6256 bool found_one = false;
6257 for (int i = 0; i < _temp_field_info->length(); i++) {
6258 FieldInfo& fi = *_temp_field_info->adr_at(i);
6259 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6260 found_one = true;
6261 if (fi.initializer_index() != 0) {
6262 // skip strict static fields with ConstantValue attributes
6263 } else {
6264 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6265 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6266 }
6267 }
6268 }
6269 assert(found_one == _has_strict_static_fields,
6270 "correct prediction = %d", (int)_has_strict_static_fields);
6271 }
6272 }
6273
6274 // In order to be able to optimize fields layouts by applying heap flattening,
6275 // the JVM needs to know the layout of the class of the fields, which implies
6276 // having these classes loaded. The strategy has two folds:
6277 // 1 - if the current class has a LoadableDescriptors attribute containing the
6278 // name of the class of the field and PreloadClasses is true, the JVM will
6279 // try to speculatively load this class. Failures to load the class are
6280 // silently discarded, and loadings resulting in a non-optimizable class
6281 // are ignored
6282 // 2 - if step 1 cannot be applied, the JVM will simply check if the class
6283 // loader of the current class already knows these classes (no class
6284 // loading triggered in this case). Note that the migrated value classes
6285 // of the JDK are automatically registered to all class loaders, and
6286 // are guaranteed to be found in this step even if the current class
6287 // has not been recompiled with JEP 401 features enabled
6288 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) {
6289 for (FieldInfo fieldinfo : *_temp_field_info) {
6290 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6291 Symbol* sig = fieldinfo.signature(cp);
6292 if (Signature::has_envelope(sig)) {
6293 TempNewSymbol name = Signature::strip_envelope(sig);
6294 if (name == _class_name) continue;
6295 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) {
6296 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6297 "Cause: field type in LoadableDescriptors attribute",
6298 name->as_C_string(), _class_name->as_C_string());
6299 oop loader = loader_data()->class_loader();
6300 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6301 Handle(THREAD, loader),
6302 false, THREAD);
6303
6304 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6305
6306 if (klass != nullptr) {
6307 if (klass->is_inline_klass()) {
6308 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6309 log_info(class, preload)("Preloading of class %s during loading of class %s "
6310 "(cause: field type in LoadableDescriptors attribute) succeeded",
6311 name->as_C_string(), _class_name->as_C_string());
6312 } else {
6313 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log this
6314 log_info(class, preload)("Preloading of class %s during loading of class %s "
6315 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6316 name->as_C_string(), _class_name->as_C_string());
6317 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6318 log_warning(class, preload)("After preloading of class %s during loading of class %s "
6319 "field was annotated with @NullRestricted but loaded class is not a value class, "
6320 "the annotation is ignored",
6321 name->as_C_string(), _class_name->as_C_string());
6322 fieldinfo.field_flags().update_null_free_inline_type(false);
6323 }
6324 }
6325 } else {
6326 log_info(class, preload)("Preloading of class %s during loading of class %s "
6327 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6328 name->as_C_string(), _class_name->as_C_string(),
6329 PENDING_EXCEPTION->klass()->name()->as_C_string());
6330 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6331 log_warning(class, preload)("After preloading of class %s during loading of class %s failed,"
6332 "field was annotated with @NullRestricted but class is unknown, "
6333 "the annotation is ignored",
6334 name->as_C_string(), _class_name->as_C_string());
6335 fieldinfo.field_flags().update_null_free_inline_type(false);
6336 }
6337
6338 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6339 // impact loading of current class.
6340 CLEAR_PENDING_EXCEPTION;
6341 }
6342 } else {
6343 oop loader = loader_data()->class_loader();
6344 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6345 if (klass != nullptr && klass->is_inline_klass()) {
6346 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6347 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary"
6348 "(field type not in LoadableDescriptors attribute)",
6349 _class_name->as_C_string(), name->as_C_string());
6350 } else if (fieldinfo.field_flags().is_null_free_inline_type()) {
6351 if (klass == nullptr) {
6352 log_warning(class, preload)("During loading of class %s, class %s is unknown, "
6353 "but a field of this type was annotated with @NullRestricted, "
6354 "the annotation is ignored",
6355 _class_name->as_C_string(), name->as_C_string());
6356 } else {
6357 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary "
6358 "and is not a concrete value class, but a field of this type was annotated with "
6359 "@NullRestricted, the annotation is ignored",
6360 _class_name->as_C_string(), name->as_C_string());
6361 }
6362 fieldinfo.field_flags().update_null_free_inline_type(false);
6363 }
6364 }
6365 }
6366 }
6367 }
6368
6369 void ClassFileParser::set_klass(InstanceKlass* klass) {
6370
6371 #ifdef ASSERT
6372 if (klass != nullptr) {
6373 assert(nullptr == _klass, "leaking?");
6374 }
6375 #endif
6376
6377 _klass = klass;
6378 }
6379
6380 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6381 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6382
6383 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6384 // never allocated for an InstanceKlass which has no need for this information.
6385 if (_inline_layout_info_array == nullptr) {
6386 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6387 java_fields_count(),
6388 CHECK);
6389 }
6390
6391 // Set the Klass for the field's index
6392 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6393 }
6394
6395 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6396
6397 #ifdef ASSERT
6398 if (klass != nullptr) {
6399 assert(nullptr == _klass_to_deallocate, "leaking?");
6400 }
6401 #endif
6402
6403 _klass_to_deallocate = klass;
6404 }
6405
6406 // Caller responsible for ResourceMark
6407 // clone stream with rewound position
6408 const ClassFileStream* ClassFileParser::clone_stream() const {
6409 assert(_stream != nullptr, "invariant");
6410
6411 return _stream->clone();
6412 }
6413
6414 ReferenceType ClassFileParser::super_reference_type() const {
6415 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6416 }
6417
6418 bool ClassFileParser::is_instance_ref_klass() const {
6419 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6420 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6421 // klass requiring special treatment in ref-processing. The abstract
6422 // j.l.r.Reference cannot be instantiated so doesn't partake in
6423 // ref-processing.
6424 return is_java_lang_ref_Reference_subclass();
6425 }
6426
6427 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6428 if (_super_klass == nullptr) {
6429 return false;
6430 }
6431
6432 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6433 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6434 return true;
6435 }
6436
6437 return _super_klass->reference_type() != REF_NONE;
6438 }
6439
6440 // ----------------------------------------------------------------------------
6441 // debugging
6442
6443 #ifdef ASSERT
6444
6445 // return true if class_name contains no '.' (internal format is '/')
6446 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6447 if (class_name != nullptr) {
6448 ResourceMark rm;
6449 char* name = class_name->as_C_string();
6450 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6451 } else {
6452 return true;
6453 }
6454 }
6455
6456 #endif