1 /*
2 * Copyright (c) 1997, 2025, 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/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "jvm.h"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldInfo.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/inlineKlass.inline.hpp"
55 #include "oops/instanceKlass.inline.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/klass.inline.hpp"
58 #include "oops/klassVtable.hpp"
59 #include "oops/metadata.hpp"
60 #include "oops/method.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/symbol.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/jvmtiThreadState.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/fieldDescriptor.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/os.hpp"
71 #include "runtime/perfData.hpp"
72 #include "runtime/reflection.hpp"
73 #include "runtime/safepointVerifiers.hpp"
74 #include "runtime/signature.hpp"
75 #include "runtime/timer.hpp"
76 #include "services/classLoadingService.hpp"
77 #include "services/threadService.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/bitMap.inline.hpp"
80 #include "utilities/checkedCast.hpp"
81 #include "utilities/copy.hpp"
82 #include "utilities/exceptions.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/globalDefinitions.hpp"
85 #include "utilities/growableArray.hpp"
86 #include "utilities/hashTable.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/stringUtils.hpp"
90 #include "utilities/utf8.hpp"
91 #if INCLUDE_CDS
92 #include "classfile/systemDictionaryShared.hpp"
93 #endif
94 #if INCLUDE_JFR
95 #include "jfr/support/jfrTraceIdExtension.hpp"
96 #endif
97
98 // We generally try to create the oops directly when parsing, rather than
99 // allocating temporary data structures and copying the bytes twice. A
100 // temporary area is only needed when parsing utf8 entries in the constant
101 // pool and when parsing line number tables.
102
103 // We add assert in debug mode when class format is not checked.
104
105 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
106 #define JAVA_MIN_SUPPORTED_VERSION 45
107 #define JAVA_PREVIEW_MINOR_VERSION 65535
108
109 // Used for two backward compatibility reasons:
110 // - to check for new additions to the class file format in JDK1.5
111 // - to check for bug fixes in the format checker in JDK1.5
112 #define JAVA_1_5_VERSION 49
113
114 // Used for backward compatibility reasons:
115 // - to check for javac bug fixes that happened after 1.5
116 // - also used as the max version when running in jdk6
117 #define JAVA_6_VERSION 50
118
119 // Used for backward compatibility reasons:
120 // - to disallow argument and require ACC_STATIC for <clinit> methods
121 #define JAVA_7_VERSION 51
122
123 // Extension method support.
124 #define JAVA_8_VERSION 52
125
126 #define JAVA_9_VERSION 53
127
128 #define JAVA_10_VERSION 54
129
130 #define JAVA_11_VERSION 55
131
132 #define JAVA_12_VERSION 56
133
134 #define JAVA_13_VERSION 57
135
136 #define JAVA_14_VERSION 58
137
138 #define JAVA_15_VERSION 59
139
140 #define JAVA_16_VERSION 60
141
142 #define JAVA_17_VERSION 61
143
144 #define JAVA_18_VERSION 62
145
146 #define JAVA_19_VERSION 63
147
148 #define JAVA_20_VERSION 64
149
150 #define JAVA_21_VERSION 65
151
152 #define JAVA_22_VERSION 66
153
154 #define JAVA_23_VERSION 67
155
156 #define JAVA_24_VERSION 68
157
158 #define JAVA_25_VERSION 69
159
160 #define JAVA_26_VERSION 70
161
162 #define CONSTANT_CLASS_DESCRIPTORS 70
163
164 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
165 assert((bad_constant == JVM_CONSTANT_Module ||
166 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
167 "Unexpected bad constant pool entry");
168 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
169 }
170
171 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
172 ConstantPool* cp,
173 const int length,
174 TRAPS) {
175 assert(stream != nullptr, "invariant");
176 assert(cp != nullptr, "invariant");
177
178 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
179 // this function (_current can be allocated in a register, with scalar
180 // replacement of aggregates). The _current pointer is copied back to
181 // stream() when this function returns. DON'T call another method within
182 // this method that uses stream().
183 const ClassFileStream cfs1 = *stream;
184 const ClassFileStream* const cfs = &cfs1;
185
186 DEBUG_ONLY(const u1* const old_current = stream->current();)
187
188 // Used for batching symbol allocations.
189 const char* names[SymbolTable::symbol_alloc_batch_size];
190 int lengths[SymbolTable::symbol_alloc_batch_size];
191 int indices[SymbolTable::symbol_alloc_batch_size];
192 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
193 int names_count = 0;
194
195 // parsing Index 0 is unused
196 for (int index = 1; index < length; index++) {
197 // Each of the following case guarantees one more byte in the stream
198 // for the following tag or the access_flags following constant pool,
199 // so we don't need bounds-check for reading tag.
200 const u1 tag = cfs->get_u1_fast();
201 switch (tag) {
202 case JVM_CONSTANT_Class: {
203 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
204 const u2 name_index = cfs->get_u2_fast();
205 cp->klass_index_at_put(index, name_index);
206 break;
207 }
208 case JVM_CONSTANT_Fieldref: {
209 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
210 const u2 class_index = cfs->get_u2_fast();
211 const u2 name_and_type_index = cfs->get_u2_fast();
212 cp->field_at_put(index, class_index, name_and_type_index);
213 break;
214 }
215 case JVM_CONSTANT_Methodref: {
216 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
217 const u2 class_index = cfs->get_u2_fast();
218 const u2 name_and_type_index = cfs->get_u2_fast();
219 cp->method_at_put(index, class_index, name_and_type_index);
220 break;
221 }
222 case JVM_CONSTANT_InterfaceMethodref: {
223 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
224 const u2 class_index = cfs->get_u2_fast();
225 const u2 name_and_type_index = cfs->get_u2_fast();
226 cp->interface_method_at_put(index, class_index, name_and_type_index);
227 break;
228 }
229 case JVM_CONSTANT_String : {
230 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
231 const u2 string_index = cfs->get_u2_fast();
232 cp->string_index_at_put(index, string_index);
233 break;
234 }
235 case JVM_CONSTANT_MethodHandle :
236 case JVM_CONSTANT_MethodType: {
237 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
238 classfile_parse_error(
239 "Class file version does not support constant tag %u in class file %s",
240 tag, THREAD);
241 return;
242 }
243 if (tag == JVM_CONSTANT_MethodHandle) {
244 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
245 const u1 ref_kind = cfs->get_u1_fast();
246 const u2 method_index = cfs->get_u2_fast();
247 cp->method_handle_index_at_put(index, ref_kind, method_index);
248 }
249 else if (tag == JVM_CONSTANT_MethodType) {
250 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
251 const u2 signature_index = cfs->get_u2_fast();
252 cp->method_type_index_at_put(index, signature_index);
253 }
254 else {
255 ShouldNotReachHere();
256 }
257 break;
258 }
259 case JVM_CONSTANT_Dynamic : {
260 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
261 classfile_parse_error(
262 "Class file version does not support constant tag %u in class file %s",
263 tag, THREAD);
264 return;
265 }
266 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
267 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
268 const u2 name_and_type_index = cfs->get_u2_fast();
269 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
270 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
271 }
272 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
273 break;
274 }
275 case JVM_CONSTANT_InvokeDynamic : {
276 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
277 classfile_parse_error(
278 "Class file version does not support constant tag %u in class file %s",
279 tag, THREAD);
280 return;
281 }
282 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
283 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
284 const u2 name_and_type_index = cfs->get_u2_fast();
285 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
286 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
287 }
288 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
289 break;
290 }
291 case JVM_CONSTANT_Integer: {
292 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
293 const u4 bytes = cfs->get_u4_fast();
294 cp->int_at_put(index, (jint)bytes);
295 break;
296 }
297 case JVM_CONSTANT_Float: {
298 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
299 const u4 bytes = cfs->get_u4_fast();
300 cp->float_at_put(index, *(jfloat*)&bytes);
301 break;
302 }
303 case JVM_CONSTANT_Long: {
304 // A mangled type might cause you to overrun allocated memory
305 guarantee_property(index + 1 < length,
306 "Invalid constant pool entry %u in class file %s",
307 index,
308 CHECK);
309 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
310 const u8 bytes = cfs->get_u8_fast();
311 cp->long_at_put(index, bytes);
312 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
313 break;
314 }
315 case JVM_CONSTANT_Double: {
316 // A mangled type might cause you to overrun allocated memory
317 guarantee_property(index+1 < length,
318 "Invalid constant pool entry %u in class file %s",
319 index,
320 CHECK);
321 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
322 const u8 bytes = cfs->get_u8_fast();
323 cp->double_at_put(index, *(jdouble*)&bytes);
324 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
325 break;
326 }
327 case JVM_CONSTANT_NameAndType: {
328 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
329 const u2 name_index = cfs->get_u2_fast();
330 const u2 signature_index = cfs->get_u2_fast();
331 cp->name_and_type_at_put(index, name_index, signature_index);
332 break;
333 }
334 case JVM_CONSTANT_Utf8 : {
335 cfs->guarantee_more(2, CHECK); // utf8_length
336 u2 utf8_length = cfs->get_u2_fast();
337 const u1* utf8_buffer = cfs->current();
338 assert(utf8_buffer != nullptr, "null utf8 buffer");
339 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
340 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
341 cfs->skip_u1_fast(utf8_length);
342
343 // Before storing the symbol, make sure it's legal
344 if (_need_verify) {
345 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
346 }
347
348 unsigned int hash;
349 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
350 utf8_length,
351 hash);
352 if (result == nullptr) {
353 names[names_count] = (const char*)utf8_buffer;
354 lengths[names_count] = utf8_length;
355 indices[names_count] = index;
356 hashValues[names_count++] = hash;
357 if (names_count == SymbolTable::symbol_alloc_batch_size) {
358 SymbolTable::new_symbols(_loader_data,
359 constantPoolHandle(THREAD, cp),
360 names_count,
361 names,
362 lengths,
363 indices,
364 hashValues);
365 names_count = 0;
366 }
367 } else {
368 cp->symbol_at_put(index, result);
369 }
370 break;
371 }
372 case JVM_CONSTANT_Module:
373 case JVM_CONSTANT_Package: {
374 // Record that an error occurred in these two cases but keep parsing so
375 // that ACC_Module can be checked for in the access_flags. Need to
376 // throw NoClassDefFoundError in that case.
377 if (_major_version >= JAVA_9_VERSION) {
378 cfs->guarantee_more(3, CHECK);
379 cfs->get_u2_fast();
380 set_class_bad_constant_seen(tag);
381 break;
382 }
383 }
384 default: {
385 classfile_parse_error("Unknown constant tag %u in class file %s",
386 tag,
387 THREAD);
388 return;
389 }
390 } // end of switch(tag)
391 } // end of for
392
393 // Allocate the remaining symbols
394 if (names_count > 0) {
395 SymbolTable::new_symbols(_loader_data,
396 constantPoolHandle(THREAD, cp),
397 names_count,
398 names,
399 lengths,
400 indices,
401 hashValues);
402 }
403
404 // Copy _current pointer of local copy back to stream.
405 assert(stream->current() == old_current, "non-exclusive use of stream");
406 stream->set_current(cfs1.current());
407
408 }
409
410 static inline bool valid_cp_range(int index, int length) {
411 return (index > 0 && index < length);
412 }
413
414 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
415 assert(cp != nullptr, "invariant");
416 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
417 return cp->symbol_at(index);
418 }
419 return nullptr;
420 }
421
422 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
423 ConstantPool* const cp,
424 const int length,
425 TRAPS) {
426 assert(cp != nullptr, "invariant");
427 assert(stream != nullptr, "invariant");
428
429 // parsing constant pool entries
430 parse_constant_pool_entries(stream, cp, length, CHECK);
431 if (class_bad_constant_seen() != 0) {
432 // a bad CP entry has been detected previously so stop parsing and just return.
433 return;
434 }
435
436 int index = 1; // declared outside of loops for portability
437 int num_klasses = 0;
438
439 // first verification pass - validate cross references
440 // and fixup class and string constants
441 for (index = 1; index < length; index++) { // Index 0 is unused
442 const jbyte tag = cp->tag_at(index).value();
443 switch (tag) {
444 case JVM_CONSTANT_Class: {
445 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
446 break;
447 }
448 case JVM_CONSTANT_Fieldref:
449 // fall through
450 case JVM_CONSTANT_Methodref:
451 // fall through
452 case JVM_CONSTANT_InterfaceMethodref: {
453 if (!_need_verify) break;
454 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
455 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
456 guarantee_property(valid_klass_reference_at(klass_ref_index),
457 "Invalid constant pool index %u in class file %s",
458 klass_ref_index, CHECK);
459 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
460 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
461 "Invalid constant pool index %u in class file %s",
462 name_and_type_ref_index, CHECK);
463 break;
464 }
465 case JVM_CONSTANT_String: {
466 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
467 break;
468 }
469 case JVM_CONSTANT_Integer:
470 break;
471 case JVM_CONSTANT_Float:
472 break;
473 case JVM_CONSTANT_Long:
474 case JVM_CONSTANT_Double: {
475 index++;
476 guarantee_property(
477 (index < length && cp->tag_at(index).is_invalid()),
478 "Improper constant pool long/double index %u in class file %s",
479 index, CHECK);
480 break;
481 }
482 case JVM_CONSTANT_NameAndType: {
483 if (!_need_verify) break;
484 const int name_ref_index = cp->name_ref_index_at(index);
485 const int signature_ref_index = cp->signature_ref_index_at(index);
486 guarantee_property(valid_symbol_at(name_ref_index),
487 "Invalid constant pool index %u in class file %s",
488 name_ref_index, CHECK);
489 guarantee_property(valid_symbol_at(signature_ref_index),
490 "Invalid constant pool index %u in class file %s",
491 signature_ref_index, CHECK);
492 break;
493 }
494 case JVM_CONSTANT_Utf8:
495 break;
496 case JVM_CONSTANT_UnresolvedClass: // fall-through
497 case JVM_CONSTANT_UnresolvedClassInError: {
498 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
499 break;
500 }
501 case JVM_CONSTANT_ClassIndex: {
502 const int class_index = cp->klass_index_at(index);
503 guarantee_property(valid_symbol_at(class_index),
504 "Invalid constant pool index %u in class file %s",
505 class_index, CHECK);
506
507 Symbol* const name = cp->symbol_at(class_index);
508 const unsigned int name_len = name->utf8_length();
509 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
510 break;
511 }
512 case JVM_CONSTANT_StringIndex: {
513 const int string_index = cp->string_index_at(index);
514 guarantee_property(valid_symbol_at(string_index),
515 "Invalid constant pool index %u in class file %s",
516 string_index, CHECK);
517 Symbol* const sym = cp->symbol_at(string_index);
518 cp->unresolved_string_at_put(index, sym);
519 break;
520 }
521 case JVM_CONSTANT_MethodHandle: {
522 const int ref_index = cp->method_handle_index_at(index);
523 guarantee_property(valid_cp_range(ref_index, length),
524 "Invalid constant pool index %u in class file %s",
525 ref_index, CHECK);
526 const constantTag tag = cp->tag_at(ref_index);
527 const int ref_kind = cp->method_handle_ref_kind_at(index);
528
529 switch (ref_kind) {
530 case JVM_REF_getField:
531 case JVM_REF_getStatic:
532 case JVM_REF_putField:
533 case JVM_REF_putStatic: {
534 guarantee_property(
535 tag.is_field(),
536 "Invalid constant pool index %u in class file %s (not a field)",
537 ref_index, CHECK);
538 break;
539 }
540 case JVM_REF_invokeVirtual:
541 case JVM_REF_newInvokeSpecial: {
542 guarantee_property(
543 tag.is_method(),
544 "Invalid constant pool index %u in class file %s (not a method)",
545 ref_index, CHECK);
546 break;
547 }
548 case JVM_REF_invokeStatic:
549 case JVM_REF_invokeSpecial: {
550 guarantee_property(
551 tag.is_method() ||
552 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
553 "Invalid constant pool index %u in class file %s (not a method)",
554 ref_index, CHECK);
555 break;
556 }
557 case JVM_REF_invokeInterface: {
558 guarantee_property(
559 tag.is_interface_method(),
560 "Invalid constant pool index %u in class file %s (not an interface method)",
561 ref_index, CHECK);
562 break;
563 }
564 default: {
565 classfile_parse_error(
566 "Bad method handle kind at constant pool index %u in class file %s",
567 index, THREAD);
568 return;
569 }
570 } // switch(refkind)
571 // Keep the ref_index unchanged. It will be indirected at link-time.
572 break;
573 } // case MethodHandle
574 case JVM_CONSTANT_MethodType: {
575 const int ref_index = cp->method_type_index_at(index);
576 guarantee_property(valid_symbol_at(ref_index),
577 "Invalid constant pool index %u in class file %s",
578 ref_index, CHECK);
579 break;
580 }
581 case JVM_CONSTANT_Dynamic: {
582 const int name_and_type_ref_index =
583 cp->bootstrap_name_and_type_ref_index_at(index);
584
585 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
586 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
587 "Invalid constant pool index %u in class file %s",
588 name_and_type_ref_index, CHECK);
589 // bootstrap specifier index must be checked later,
590 // when BootstrapMethods attr is available
591
592 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
593 cp->set_has_dynamic_constant();
594 break;
595 }
596 case JVM_CONSTANT_InvokeDynamic: {
597 const int name_and_type_ref_index =
598 cp->bootstrap_name_and_type_ref_index_at(index);
599
600 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
601 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
602 "Invalid constant pool index %u in class file %s",
603 name_and_type_ref_index, CHECK);
604 // bootstrap specifier index must be checked later,
605 // when BootstrapMethods attr is available
606 break;
607 }
608 default: {
609 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
610 ShouldNotReachHere();
611 break;
612 }
613 } // switch(tag)
614 } // end of for
615
616 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
617
618 if (!_need_verify) {
619 return;
620 }
621
622 // second verification pass - checks the strings are of the right format.
623 // but not yet to the other entries
624 for (index = 1; index < length; index++) {
625 const jbyte tag = cp->tag_at(index).value();
626 switch (tag) {
627 case JVM_CONSTANT_UnresolvedClass: {
628 const Symbol* const class_name = cp->klass_name_at(index);
629 // check the name
630 verify_legal_class_name(class_name, CHECK);
631 break;
632 }
633 case JVM_CONSTANT_NameAndType: {
634 if (_need_verify) {
635 const int sig_index = cp->signature_ref_index_at(index);
636 const int name_index = cp->name_ref_index_at(index);
637 const Symbol* const name = cp->symbol_at(name_index);
638 const Symbol* const sig = cp->symbol_at(sig_index);
639 guarantee_property(sig->utf8_length() != 0,
640 "Illegal zero length constant pool entry at %d in class %s",
641 sig_index, CHECK);
642 guarantee_property(name->utf8_length() != 0,
643 "Illegal zero length constant pool entry at %d in class %s",
644 name_index, CHECK);
645
646 if (Signature::is_method(sig)) {
647 // Format check method name and signature
648 verify_legal_method_name(name, CHECK);
649 verify_legal_method_signature(name, sig, CHECK);
650 } else {
651 // Format check field name and signature
652 verify_legal_field_name(name, CHECK);
653 verify_legal_field_signature(name, sig, CHECK);
654 }
655 }
656 break;
657 }
658 case JVM_CONSTANT_Dynamic: {
659 const int name_and_type_ref_index =
660 cp->uncached_name_and_type_ref_index_at(index);
661 // already verified to be utf8
662 const int name_ref_index =
663 cp->name_ref_index_at(name_and_type_ref_index);
664 // already verified to be utf8
665 const int signature_ref_index =
666 cp->signature_ref_index_at(name_and_type_ref_index);
667 const Symbol* const name = cp->symbol_at(name_ref_index);
668 const Symbol* const signature = cp->symbol_at(signature_ref_index);
669 if (_need_verify) {
670 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
671 // Need only to be sure signature is the right type.
672 if (Signature::is_method(signature)) {
673 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
674 }
675 }
676 break;
677 }
678 case JVM_CONSTANT_InvokeDynamic:
679 case JVM_CONSTANT_Fieldref:
680 case JVM_CONSTANT_Methodref:
681 case JVM_CONSTANT_InterfaceMethodref: {
682 const int name_and_type_ref_index =
683 cp->uncached_name_and_type_ref_index_at(index);
684 // already verified to be utf8
685 const int name_ref_index =
686 cp->name_ref_index_at(name_and_type_ref_index);
687 // already verified to be utf8
688 const int signature_ref_index =
689 cp->signature_ref_index_at(name_and_type_ref_index);
690 const Symbol* const name = cp->symbol_at(name_ref_index);
691 const Symbol* const signature = cp->symbol_at(signature_ref_index);
692 if (tag == JVM_CONSTANT_Fieldref) {
693 if (_need_verify) {
694 // Field name and signature are verified above, when iterating NameAndType_info.
695 // Need only to be sure signature is non-zero length and the right type.
696 if (Signature::is_method(signature)) {
697 throwIllegalSignature("Field", name, signature, CHECK);
698 }
699 }
700 } else {
701 if (_need_verify) {
702 // Method name and signature are individually verified above, when iterating
703 // NameAndType_info. Need to check here that signature is non-zero length and
704 // the right type.
705 if (!Signature::is_method(signature)) {
706 throwIllegalSignature("Method", name, signature, CHECK);
707 }
708 }
709 // If a class method name begins with '<', it must be "<init>" and have void signature.
710 const unsigned int name_len = name->utf8_length();
711 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
712 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
713 if (name != vmSymbols::object_initializer_name()) {
714 classfile_parse_error(
715 "Bad method name at constant pool index %u in class file %s",
716 name_ref_index, THREAD);
717 return;
718 } else if (!Signature::is_void_method(signature)) { // must have void signature.
719 throwIllegalSignature("Method", name, signature, CHECK);
720 }
721 }
722 }
723 break;
724 }
725 case JVM_CONSTANT_MethodHandle: {
726 const int ref_index = cp->method_handle_index_at(index);
727 const int ref_kind = cp->method_handle_ref_kind_at(index);
728 switch (ref_kind) {
729 case JVM_REF_invokeVirtual:
730 case JVM_REF_invokeStatic:
731 case JVM_REF_invokeSpecial:
732 case JVM_REF_newInvokeSpecial: {
733 const int name_and_type_ref_index =
734 cp->uncached_name_and_type_ref_index_at(ref_index);
735 const int name_ref_index =
736 cp->name_ref_index_at(name_and_type_ref_index);
737 const Symbol* const name = cp->symbol_at(name_ref_index);
738
739 if (name != vmSymbols::object_initializer_name()) { // !<init>
740 if (ref_kind == JVM_REF_newInvokeSpecial) {
741 classfile_parse_error(
742 "Bad constructor name at constant pool index %u in class file %s",
743 name_ref_index, THREAD);
744 return;
745 }
746 } else { // <init>
747 // The allowed invocation mode of <init> depends on its signature.
748 // This test corresponds to verify_invoke_instructions in the verifier.
749 const int signature_ref_index =
750 cp->signature_ref_index_at(name_and_type_ref_index);
751 const Symbol* const signature = cp->symbol_at(signature_ref_index);
752 if (signature->is_void_method_signature()
753 && ref_kind == JVM_REF_newInvokeSpecial) {
754 // OK, could be a constructor call
755 } else {
756 classfile_parse_error(
757 "Bad method name at constant pool index %u in class file %s",
758 name_ref_index, THREAD);
759 return;
760 }
761 }
762 break;
763 }
764 // Other ref_kinds are already fully checked in previous pass.
765 } // switch(ref_kind)
766 break;
767 }
768 case JVM_CONSTANT_MethodType: {
769 const Symbol* const no_name = vmSymbols::type_name(); // place holder
770 const Symbol* const signature = cp->method_type_signature_at(index);
771 verify_legal_method_signature(no_name, signature, CHECK);
772 break;
773 }
774 case JVM_CONSTANT_Utf8: {
775 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
776 }
777 } // switch(tag)
778 } // end of for
779 }
780
781 class NameSigHash: public ResourceObj {
782 public:
783 const Symbol* _name; // name
784 const Symbol* _sig; // signature
785
786 static const int HASH_ROW_SIZE = 256;
787
788 NameSigHash(Symbol* name, Symbol* sig) :
789 _name(name),
790 _sig(sig) {}
791
792 static unsigned int hash(NameSigHash const& namesig) {
793 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
794 }
795
796 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
797 return (e0._name == e1._name) &&
798 (e0._sig == e1._sig);
799 }
800 };
801
802 using NameSigHashtable = HashTable<NameSigHash, int,
803 NameSigHash::HASH_ROW_SIZE,
804 AnyObj::RESOURCE_AREA, mtInternal,
805 &NameSigHash::hash, &NameSigHash::equals>;
806
807 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
808 assert(super_type != nullptr,"Method doesn't support null super type");
809 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
810 && super_type->name() != vmSymbols::java_lang_Object()) {
811 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
812 err_msg("Value type %s has an identity type as supertype",
813 current->class_name()->as_klass_external_name()));
814 }
815 }
816
817 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
818 int itfs_len,
819 ConstantPool* cp,
820 bool* const has_nonstatic_concrete_methods,
821 // FIXME: lots of these functions
822 // declare their parameters as const,
823 // which adds only noise to the code.
824 // Remove the spurious const modifiers.
825 // Many are of the form "const int x"
826 // or "T* const x".
827 TRAPS) {
828 assert(stream != nullptr, "invariant");
829 assert(cp != nullptr, "invariant");
830 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
831
832 if (itfs_len == 0) {
833 _local_interfaces = Universe::the_empty_instance_klass_array();
834
835 } else {
836 assert(itfs_len > 0, "only called for len>0");
837 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
838 int index = 0;
839 for (index = 0; index < itfs_len; index++) {
840 const u2 interface_index = stream->get_u2(CHECK);
841 guarantee_property(
842 valid_klass_reference_at(interface_index),
843 "Interface name has bad constant pool index %u in class file %s",
844 interface_index, CHECK);
845 _local_interface_indexes->at_put_grow(index, interface_index);
846 }
847
848 if (!_need_verify || itfs_len <= 1) {
849 return;
850 }
851
852 // Check if there's any duplicates in interfaces
853 ResourceMark rm(THREAD);
854 // Set containing interface names
855 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
856 for (index = 0; index < itfs_len; index++) {
857 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
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 _annotation_LIMIT
951 };
952 const Location _location;
953 int _annotations_present;
954 u2 _contended_group;
955
956 AnnotationCollector(Location location)
957 : _location(location), _annotations_present(0), _contended_group(0)
958 {
959 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
960 }
961 // If this annotation name has an ID, report it (or _none).
962 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
963 // Set the annotation name:
964 void set_annotation(ID id) {
965 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
966 _annotations_present |= (int)nth_bit((int)id);
967 }
968
969 void remove_annotation(ID id) {
970 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
971 _annotations_present &= (int)~nth_bit((int)id);
972 }
973
974 // Report if the annotation is present.
975 bool has_any_annotations() const { return _annotations_present != 0; }
976 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
977
978 void set_contended_group(u2 group) { _contended_group = group; }
979 u2 contended_group() const { return _contended_group; }
980
981 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
982
983 void set_stable(bool stable) { set_annotation(_field_Stable); }
984 bool is_stable() const { return has_annotation(_field_Stable); }
985
986 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); }
987 };
988
989 // This class also doubles as a holder for metadata cleanup.
990 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
991 private:
992 ClassLoaderData* _loader_data;
993 AnnotationArray* _field_annotations;
994 AnnotationArray* _field_type_annotations;
995 public:
996 FieldAnnotationCollector(ClassLoaderData* loader_data) :
997 AnnotationCollector(_in_field),
998 _loader_data(loader_data),
999 _field_annotations(nullptr),
1000 _field_type_annotations(nullptr) {}
1001 ~FieldAnnotationCollector();
1002 void apply_to(FieldInfo* f);
1003 AnnotationArray* field_annotations() { return _field_annotations; }
1004 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1005
1006 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1007 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1008 };
1009
1010 class MethodAnnotationCollector : public AnnotationCollector{
1011 public:
1012 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1013 void apply_to(const methodHandle& m);
1014 };
1015
1016 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1017 public:
1018 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1019 void apply_to(InstanceKlass* ik);
1020 };
1021
1022
1023 static int skip_annotation_value(const u1*, int, int); // fwd decl
1024
1025 // Safely increment index by val if does not pass limit
1026 #define SAFE_ADD(index, limit, val) \
1027 if (index >= limit - val) return limit; \
1028 index += val;
1029
1030 // Skip an annotation. Return >=limit if there is any problem.
1031 static int skip_annotation(const u1* buffer, int limit, int index) {
1032 assert(buffer != nullptr, "invariant");
1033 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1034 // value := switch (tag:u1) { ... }
1035 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1036 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1037 while (--nmem >= 0 && index < limit) {
1038 SAFE_ADD(index, limit, 2); // skip member
1039 index = skip_annotation_value(buffer, limit, index);
1040 }
1041 return index;
1042 }
1043
1044 // Skip an annotation value. Return >=limit if there is any problem.
1045 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1046 assert(buffer != nullptr, "invariant");
1047
1048 // value := switch (tag:u1) {
1049 // case B, C, I, S, Z, D, F, J, c: con:u2;
1050 // case e: e_class:u2 e_name:u2;
1051 // case s: s_con:u2;
1052 // case [: do(nval:u2) {value};
1053 // case @: annotation;
1054 // case s: s_con:u2;
1055 // }
1056 SAFE_ADD(index, limit, 1); // read tag
1057 const u1 tag = buffer[index - 1];
1058 switch (tag) {
1059 case 'B':
1060 case 'C':
1061 case 'I':
1062 case 'S':
1063 case 'Z':
1064 case 'D':
1065 case 'F':
1066 case 'J':
1067 case 'c':
1068 case 's':
1069 SAFE_ADD(index, limit, 2); // skip con or s_con
1070 break;
1071 case 'e':
1072 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1073 break;
1074 case '[':
1075 {
1076 SAFE_ADD(index, limit, 2); // read nval
1077 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1078 while (--nval >= 0 && index < limit) {
1079 index = skip_annotation_value(buffer, limit, index);
1080 }
1081 }
1082 break;
1083 case '@':
1084 index = skip_annotation(buffer, limit, index);
1085 break;
1086 default:
1087 return limit; // bad tag byte
1088 }
1089 return index;
1090 }
1091
1092 // Sift through annotations, looking for those significant to the VM:
1093 static void parse_annotations(const ConstantPool* const cp,
1094 const u1* buffer, int limit,
1095 AnnotationCollector* coll,
1096 ClassLoaderData* loader_data,
1097 const bool can_access_vm_annotations) {
1098
1099 assert(cp != nullptr, "invariant");
1100 assert(buffer != nullptr, "invariant");
1101 assert(coll != nullptr, "invariant");
1102 assert(loader_data != nullptr, "invariant");
1103
1104 // annotations := do(nann:u2) {annotation}
1105 int index = 2; // read nann
1106 if (index >= limit) return;
1107 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1108 enum { // initial annotation layout
1109 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1110 count_off = 2, // u2 such as 1 (one value)
1111 member_off = 4, // utf8 such as 'value'
1112 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1113 e_tag_val = 'e',
1114 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1115 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1116 e_size = 11, // end of 'e' annotation
1117 c_tag_val = 'c', // payload is type
1118 c_con_off = 7, // utf8 payload, such as 'I'
1119 c_size = 9, // end of 'c' annotation
1120 s_tag_val = 's', // payload is String
1121 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1122 s_size = 9,
1123 b_tag_val = 'Z', // payload is boolean
1124 min_size = 6 // smallest possible size (zero members)
1125 };
1126 // Cannot add min_size to index in case of overflow MAX_INT
1127 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1128 int index0 = index;
1129 index = skip_annotation(buffer, limit, index);
1130 const u1* const abase = buffer + index0;
1131 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1132 const int count = Bytes::get_Java_u2((address)abase + count_off);
1133 const Symbol* const aname = check_symbol_at(cp, atype);
1134 if (aname == nullptr) break; // invalid annotation name
1135 const Symbol* member = nullptr;
1136 if (count >= 1) {
1137 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1138 member = check_symbol_at(cp, member_index);
1139 if (member == nullptr) break; // invalid member name
1140 }
1141
1142 // Here is where parsing particular annotations will take place.
1143 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1144 if (AnnotationCollector::_unknown == id) continue;
1145 coll->set_annotation(id);
1146 if (AnnotationCollector::_java_lang_Deprecated == id) {
1147 // @Deprecated can specify forRemoval=true, which we need
1148 // to record for JFR to use. If the annotation is not well-formed
1149 // then we may not be able to determine that.
1150 const u1* offset = abase + member_off;
1151 // There are only 2 members in @Deprecated.
1152 int n_members = MIN2(count, 2);
1153 for (int i = 0; i < n_members; ++i) {
1154 int member_index = Bytes::get_Java_u2((address)offset);
1155 offset += 2;
1156 member = check_symbol_at(cp, member_index);
1157 if (member == vmSymbols::since() &&
1158 (*((address)offset) == s_tag_val)) {
1159 // Found `since` first so skip over it
1160 offset += 3;
1161 }
1162 else if (member == vmSymbols::for_removal() &&
1163 (*((address)offset) == b_tag_val)) {
1164 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1165 // No guarantee the entry is valid so check it refers to an int in the CP.
1166 if (cp->is_within_bounds(boolean_value_index) &&
1167 cp->tag_at(boolean_value_index).is_int() &&
1168 cp->int_at(boolean_value_index) == 1) {
1169 // forRemoval == true
1170 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1171 }
1172 break; // no need to check further
1173 }
1174 else {
1175 // This @Deprecated annotation is malformed so we don't try to
1176 // determine whether forRemoval is set.
1177 break;
1178 }
1179 }
1180 continue; // proceed to next annotation
1181 }
1182
1183 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1184 // @Contended can optionally specify the contention group.
1185 //
1186 // Contended group defines the equivalence class over the fields:
1187 // the fields within the same contended group are not treated distinct.
1188 // The only exception is default group, which does not incur the
1189 // equivalence. Naturally, contention group for classes is meaningless.
1190 //
1191 // While the contention group is specified as String, annotation
1192 // values are already interned, and we might as well use the constant
1193 // pool index as the group tag.
1194 //
1195 u2 group_index = 0; // default contended group
1196 if (count == 1
1197 && s_size == (index - index0) // match size
1198 && s_tag_val == *(abase + tag_off)
1199 && member == vmSymbols::value_name()) {
1200 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1201 // No guarantee the group_index is valid so check it refers to a
1202 // symbol in the CP.
1203 if (cp->is_within_bounds(group_index) &&
1204 cp->tag_at(group_index).is_utf8()) {
1205 // Seems valid, so check for empty string and reset
1206 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1207 group_index = 0; // default contended group
1208 }
1209 } else {
1210 // Not valid so use the default
1211 group_index = 0;
1212 }
1213 }
1214 coll->set_contended_group(group_index);
1215 continue; // proceed to next annotation
1216 }
1217 }
1218 }
1219
1220
1221 // Parse attributes for a field.
1222 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1223 u2 attributes_count,
1224 bool is_static, u2 signature_index,
1225 u2* const constantvalue_index_addr,
1226 bool* const is_synthetic_addr,
1227 u2* const generic_signature_index_addr,
1228 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1229 TRAPS) {
1230 assert(cfs != nullptr, "invariant");
1231 assert(constantvalue_index_addr != nullptr, "invariant");
1232 assert(is_synthetic_addr != nullptr, "invariant");
1233 assert(generic_signature_index_addr != nullptr, "invariant");
1234 assert(parsed_annotations != nullptr, "invariant");
1235 assert(attributes_count > 0, "attributes_count should be greater than 0");
1236
1237 u2 constantvalue_index = 0;
1238 u2 generic_signature_index = 0;
1239 bool is_synthetic = false;
1240 const u1* runtime_visible_annotations = nullptr;
1241 int runtime_visible_annotations_length = 0;
1242 const u1* runtime_visible_type_annotations = nullptr;
1243 int runtime_visible_type_annotations_length = 0;
1244 bool runtime_invisible_annotations_exists = false;
1245 bool runtime_invisible_type_annotations_exists = false;
1246 const ConstantPool* const cp = _cp;
1247
1248 while (attributes_count--) {
1249 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1250 const u2 attribute_name_index = cfs->get_u2_fast();
1251 const u4 attribute_length = cfs->get_u4_fast();
1252 guarantee_property(valid_symbol_at(attribute_name_index),
1253 "Invalid field attribute index %u in class file %s",
1254 attribute_name_index,
1255 CHECK);
1256
1257 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1258 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1259 // ignore if non-static
1260 if (constantvalue_index != 0) {
1261 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1262 return;
1263 }
1264 guarantee_property(
1265 attribute_length == 2,
1266 "Invalid ConstantValue field attribute length %u in class file %s",
1267 attribute_length, CHECK);
1268
1269 constantvalue_index = cfs->get_u2(CHECK);
1270 if (_need_verify) {
1271 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1272 }
1273 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1274 if (attribute_length != 0) {
1275 classfile_parse_error(
1276 "Invalid Synthetic field attribute length %u in class file %s",
1277 attribute_length, THREAD);
1278 return;
1279 }
1280 is_synthetic = true;
1281 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1282 if (attribute_length != 0) {
1283 classfile_parse_error(
1284 "Invalid Deprecated field attribute length %u in class file %s",
1285 attribute_length, THREAD);
1286 return;
1287 }
1288 } else if (_major_version >= JAVA_1_5_VERSION) {
1289 if (attribute_name == vmSymbols::tag_signature()) {
1290 if (generic_signature_index != 0) {
1291 classfile_parse_error(
1292 "Multiple Signature attributes for field in class file %s", THREAD);
1293 return;
1294 }
1295 if (attribute_length != 2) {
1296 classfile_parse_error(
1297 "Wrong size %u for field's Signature attribute in class file %s",
1298 attribute_length, THREAD);
1299 return;
1300 }
1301 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1302 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1303 if (runtime_visible_annotations != nullptr) {
1304 classfile_parse_error(
1305 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1306 return;
1307 }
1308 runtime_visible_annotations_length = attribute_length;
1309 runtime_visible_annotations = cfs->current();
1310 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1311 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1312 parse_annotations(cp,
1313 runtime_visible_annotations,
1314 runtime_visible_annotations_length,
1315 parsed_annotations,
1316 _loader_data,
1317 _can_access_vm_annotations);
1318 cfs->skip_u1_fast(runtime_visible_annotations_length);
1319 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1320 if (runtime_invisible_annotations_exists) {
1321 classfile_parse_error(
1322 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1323 return;
1324 }
1325 runtime_invisible_annotations_exists = true;
1326 cfs->skip_u1(attribute_length, CHECK);
1327 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1328 if (runtime_visible_type_annotations != nullptr) {
1329 classfile_parse_error(
1330 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1331 return;
1332 }
1333 runtime_visible_type_annotations_length = attribute_length;
1334 runtime_visible_type_annotations = cfs->current();
1335 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1336 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1337 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1338 if (runtime_invisible_type_annotations_exists) {
1339 classfile_parse_error(
1340 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1341 return;
1342 } else {
1343 runtime_invisible_type_annotations_exists = true;
1344 }
1345 cfs->skip_u1(attribute_length, CHECK);
1346 } else {
1347 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1348 }
1349 } else {
1350 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1351 }
1352 }
1353
1354 *constantvalue_index_addr = constantvalue_index;
1355 *is_synthetic_addr = is_synthetic;
1356 *generic_signature_index_addr = generic_signature_index;
1357 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1358 runtime_visible_annotations_length,
1359 CHECK);
1360 parsed_annotations->set_field_annotations(a);
1361 a = allocate_annotations(runtime_visible_type_annotations,
1362 runtime_visible_type_annotations_length,
1363 CHECK);
1364 parsed_annotations->set_field_type_annotations(a);
1365 return;
1366 }
1367
1368
1369 // Side-effects: populates the _fields, _fields_annotations,
1370 // _fields_type_annotations fields
1371 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1372 AccessFlags class_access_flags,
1373 ConstantPool* cp,
1374 const int cp_size,
1375 u2* const java_fields_count_ptr,
1376 TRAPS) {
1377
1378 assert(cfs != nullptr, "invariant");
1379 assert(cp != nullptr, "invariant");
1380 assert(java_fields_count_ptr != nullptr, "invariant");
1381
1382 assert(nullptr == _fields_annotations, "invariant");
1383 assert(nullptr == _fields_type_annotations, "invariant");
1384
1385 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1386 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1387 cfs->guarantee_more(2, CHECK); // length
1388 const u2 length = cfs->get_u2_fast();
1389 *java_fields_count_ptr = length;
1390
1391 int num_injected = 0;
1392 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1393 &num_injected);
1394
1395 // two more slots are required for inline classes:
1396 // one for the static field with a reference to the pre-allocated default value
1397 // one for the field the JVM injects when detecting an empty inline class
1398 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1399 + ((UseAltSubstitutabilityMethod && is_value_class) ? 1 : 0);
1400
1401 // Allocate a temporary resource array to collect field data.
1402 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1403 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1404
1405 int instance_fields_count = 0;
1406 ResourceMark rm(THREAD);
1407 for (int n = 0; n < length; n++) {
1408 // access_flags, name_index, descriptor_index, attributes_count
1409 cfs->guarantee_more(8, CHECK);
1410
1411 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1412 if (!supports_inline_types()) {
1413 recognized_modifiers &= ~JVM_ACC_STRICT;
1414 }
1415
1416 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1417 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1418 AccessFlags access_flags;
1419 access_flags.set_flags(flags);
1420 FieldInfo::FieldFlags fieldFlags(0);
1421
1422 const u2 name_index = cfs->get_u2_fast();
1423 guarantee_property(valid_symbol_at(name_index),
1424 "Invalid constant pool index %u for field name in class file %s",
1425 name_index, CHECK);
1426 const Symbol* const name = cp->symbol_at(name_index);
1427 verify_legal_field_name(name, CHECK);
1428
1429 const u2 signature_index = cfs->get_u2_fast();
1430 guarantee_property(valid_symbol_at(signature_index),
1431 "Invalid constant pool index %u for field signature in class file %s",
1432 signature_index, CHECK);
1433 const Symbol* const sig = cp->symbol_at(signature_index);
1434 verify_legal_field_signature(name, sig, CHECK);
1435 if (!access_flags.is_static()) instance_fields_count++;
1436
1437 u2 constantvalue_index = 0;
1438 bool is_synthetic = false;
1439 u2 generic_signature_index = 0;
1440 const bool is_static = access_flags.is_static();
1441 FieldAnnotationCollector parsed_annotations(_loader_data);
1442
1443 bool is_null_restricted = false;
1444
1445 const u2 attributes_count = cfs->get_u2_fast();
1446 if (attributes_count > 0) {
1447 parse_field_attributes(cfs,
1448 attributes_count,
1449 is_static,
1450 signature_index,
1451 &constantvalue_index,
1452 &is_synthetic,
1453 &generic_signature_index,
1454 &parsed_annotations,
1455 CHECK);
1456
1457 if (parsed_annotations.field_annotations() != nullptr) {
1458 if (_fields_annotations == nullptr) {
1459 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1460 _loader_data, length, nullptr,
1461 CHECK);
1462 }
1463 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1464 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1465 if (!Signature::has_envelope(sig)) {
1466 Exceptions::fthrow(
1467 THREAD_AND_LOCATION,
1468 vmSymbols::java_lang_ClassFormatError(),
1469 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1470 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1471 }
1472 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
1473 if (!is_strict) {
1474 Exceptions::fthrow(
1475 THREAD_AND_LOCATION,
1476 vmSymbols::java_lang_ClassFormatError(),
1477 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s which doesn't have the @jdk.internal.vm.annotation.Strict annotation",
1478 class_name()->as_C_string(), name->as_C_string());
1479 }
1480 is_null_restricted = true;
1481 }
1482 parsed_annotations.set_field_annotations(nullptr);
1483 }
1484 if (parsed_annotations.field_type_annotations() != nullptr) {
1485 if (_fields_type_annotations == nullptr) {
1486 _fields_type_annotations =
1487 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1488 length,
1489 nullptr,
1490 CHECK);
1491 }
1492 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1493 parsed_annotations.set_field_type_annotations(nullptr);
1494 }
1495
1496 if (is_synthetic) {
1497 access_flags.set_is_synthetic();
1498 }
1499 if (generic_signature_index != 0) {
1500 fieldFlags.update_generic(true);
1501 }
1502 }
1503
1504 if (is_null_restricted) {
1505 fieldFlags.update_null_free_inline_type(true);
1506 }
1507
1508 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1509
1510 // Update number of static oop fields.
1511 if (is_static && is_reference_type(type)) {
1512 _static_oop_count++;
1513 }
1514
1515 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1516 fi.set_index(n);
1517 if (fieldFlags.is_generic()) {
1518 fi.set_generic_signature_index(generic_signature_index);
1519 }
1520 parsed_annotations.apply_to(&fi);
1521 if (fi.field_flags().is_contended()) {
1522 _has_contended_fields = true;
1523 }
1524 if (access_flags.is_strict() && access_flags.is_static()) {
1525 _has_strict_static_fields = true;
1526 }
1527 _temp_field_info->append(fi);
1528 }
1529 assert(_temp_field_info->length() == length, "Must be");
1530
1531 if (num_injected != 0) {
1532 for (int n = 0; n < num_injected; n++) {
1533 // Check for duplicates
1534 if (injected[n].may_be_java) {
1535 const Symbol* const name = injected[n].name();
1536 const Symbol* const signature = injected[n].signature();
1537 bool duplicate = false;
1538 for (int i = 0; i < length; i++) {
1539 const FieldInfo* const f = _temp_field_info->adr_at(i);
1540 if (name == cp->symbol_at(f->name_index()) &&
1541 signature == cp->symbol_at(f->signature_index())) {
1542 // Symbol is desclared in Java so skip this one
1543 duplicate = true;
1544 break;
1545 }
1546 }
1547 if (duplicate) {
1548 // These will be removed from the field array at the end
1549 continue;
1550 }
1551 }
1552
1553 // Injected field
1554 FieldInfo::FieldFlags fflags(0);
1555 fflags.update_injected(true);
1556 AccessFlags aflags;
1557 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1558 int idx = _temp_field_info->append(fi);
1559 _temp_field_info->adr_at(idx)->set_index(idx);
1560 }
1561 }
1562
1563 if (is_inline_type) {
1564 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1565 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1566 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1567 // alive.
1568 FieldInfo::FieldFlags fflags2(0);
1569 fflags2.update_injected(true);
1570 AccessFlags aflags2(JVM_ACC_STATIC);
1571 FieldInfo fi2(aflags2,
1572 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1573 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1574 0,
1575 fflags2);
1576 int idx2 = _temp_field_info->append(fi2);
1577 _temp_field_info->adr_at(idx2)->set_index(idx2);
1578 _static_oop_count++;
1579 }
1580 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1581 && _class_name != vmSymbols::java_lang_Object() && UseAltSubstitutabilityMethod) {
1582 // Acmp map required for abstract and concrete value classes
1583 FieldInfo::FieldFlags fflags2(0);
1584 fflags2.update_injected(true);
1585 fflags2.update_stable(true);
1586 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1587 FieldInfo fi3(aflags2,
1588 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1589 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1590 0,
1591 fflags2);
1592 int idx2 = _temp_field_info->append(fi3);
1593 _temp_field_info->adr_at(idx2)->set_index(idx2);
1594 _static_oop_count++;
1595 }
1596
1597 if (_need_verify && length > 1) {
1598 // Check duplicated fields
1599 ResourceMark rm(THREAD);
1600 // Set containing name-signature pairs
1601 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1602 for (int i = 0; i < _temp_field_info->length(); i++) {
1603 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1604 _temp_field_info->adr_at(i)->signature(_cp));
1605 // If no duplicates, add name/signature in hashtable names_and_sigs.
1606 if(!names_and_sigs->put(name_and_sig, 0)) {
1607 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1608 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1609 return;
1610 }
1611 }
1612 }
1613 }
1614
1615
1616 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1617 u4 code_length,
1618 u4 exception_table_length,
1619 TRAPS) {
1620 assert(cfs != nullptr, "invariant");
1621
1622 const unsafe_u2* const exception_table_start = cfs->current();
1623 assert(exception_table_start != nullptr, "null exception table");
1624
1625 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1626 // end_pc,
1627 // handler_pc,
1628 // catch_type_index
1629
1630 // Will check legal target after parsing code array in verifier.
1631 if (_need_verify) {
1632 for (unsigned int i = 0; i < exception_table_length; i++) {
1633 const u2 start_pc = cfs->get_u2_fast();
1634 const u2 end_pc = cfs->get_u2_fast();
1635 const u2 handler_pc = cfs->get_u2_fast();
1636 const u2 catch_type_index = cfs->get_u2_fast();
1637 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1638 "Illegal exception table range in class file %s",
1639 CHECK_NULL);
1640 guarantee_property(handler_pc < code_length,
1641 "Illegal exception table handler in class file %s",
1642 CHECK_NULL);
1643 if (catch_type_index != 0) {
1644 guarantee_property(valid_klass_reference_at(catch_type_index),
1645 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1646 }
1647 }
1648 } else {
1649 cfs->skip_u2_fast(exception_table_length * 4);
1650 }
1651 return exception_table_start;
1652 }
1653
1654 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1655 u4 code_length,
1656 CompressedLineNumberWriteStream**const write_stream,
1657 TRAPS) {
1658
1659 const ClassFileStream* const cfs = _stream;
1660 unsigned int num_entries = cfs->get_u2(CHECK);
1661
1662 // Each entry is a u2 start_pc, and a u2 line_number
1663 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1664
1665 // Verify line number attribute and table length
1666 guarantee_property(
1667 code_attribute_length == sizeof(u2) + length_in_bytes,
1668 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1669
1670 cfs->guarantee_more(length_in_bytes, CHECK);
1671
1672 if ((*write_stream) == nullptr) {
1673 if (length_in_bytes > fixed_buffer_size) {
1674 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1675 } else {
1676 (*write_stream) = new CompressedLineNumberWriteStream(
1677 _linenumbertable_buffer, fixed_buffer_size);
1678 }
1679 }
1680
1681 while (num_entries-- > 0) {
1682 const u2 bci = cfs->get_u2_fast(); // start_pc
1683 const u2 line = cfs->get_u2_fast(); // line_number
1684 guarantee_property(bci < code_length,
1685 "Invalid pc in LineNumberTable in class file %s", CHECK);
1686 (*write_stream)->write_pair(bci, line);
1687 }
1688 }
1689
1690
1691 class LVT_Hash : public AllStatic {
1692 public:
1693
1694 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1695 /*
1696 * 3-tuple start_bci/length/slot has to be unique key,
1697 * so the following comparison seems to be redundant:
1698 * && elem->name_cp_index == entry->_elem->name_cp_index
1699 */
1700 return (e0.start_bci == e1.start_bci &&
1701 e0.length == e1.length &&
1702 e0.name_cp_index == e1.name_cp_index &&
1703 e0.slot == e1.slot);
1704 }
1705
1706 static unsigned int hash(LocalVariableTableElement const& e0) {
1707 unsigned int raw_hash = e0.start_bci;
1708
1709 raw_hash = e0.length + raw_hash * 37;
1710 raw_hash = e0.name_cp_index + raw_hash * 37;
1711 raw_hash = e0.slot + raw_hash * 37;
1712
1713 return raw_hash;
1714 }
1715 };
1716
1717
1718 // Class file LocalVariableTable elements.
1719 class Classfile_LVT_Element {
1720 public:
1721 u2 start_bci;
1722 u2 length;
1723 u2 name_cp_index;
1724 u2 descriptor_cp_index;
1725 u2 slot;
1726 };
1727
1728 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1729 LocalVariableTableElement* const lvt) {
1730 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1731 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1732 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1733 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1734 lvt->signature_cp_index = 0;
1735 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1736 }
1737
1738 // Function is used to parse both attributes:
1739 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1740 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1741 u4 code_length,
1742 u2 max_locals,
1743 u4 code_attribute_length,
1744 u2* const localvariable_table_length,
1745 bool isLVTT,
1746 TRAPS) {
1747 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1748 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1749 const unsigned int size = checked_cast<unsigned>(
1750 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1751
1752 const ConstantPool* const cp = _cp;
1753
1754 // Verify local variable table attribute has right length
1755 if (_need_verify) {
1756 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1757 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1758 }
1759
1760 const unsafe_u2* const localvariable_table_start = cfs->current();
1761 assert(localvariable_table_start != nullptr, "null local variable table");
1762 if (!_need_verify) {
1763 cfs->skip_u2_fast(size);
1764 } else {
1765 cfs->guarantee_more(size * 2, CHECK_NULL);
1766 for(int i = 0; i < (*localvariable_table_length); i++) {
1767 const u2 start_pc = cfs->get_u2_fast();
1768 const u2 length = cfs->get_u2_fast();
1769 const u2 name_index = cfs->get_u2_fast();
1770 const u2 descriptor_index = cfs->get_u2_fast();
1771 const u2 index = cfs->get_u2_fast();
1772 // Assign to a u4 to avoid overflow
1773 const u4 end_pc = (u4)start_pc + (u4)length;
1774
1775 if (start_pc >= code_length) {
1776 classfile_parse_error(
1777 "Invalid start_pc %u in %s in class file %s",
1778 start_pc, tbl_name, THREAD);
1779 return nullptr;
1780 }
1781 if (end_pc > code_length) {
1782 classfile_parse_error(
1783 "Invalid length %u in %s in class file %s",
1784 length, tbl_name, THREAD);
1785 return nullptr;
1786 }
1787 const int cp_size = cp->length();
1788 guarantee_property(valid_symbol_at(name_index),
1789 "Name index %u in %s has bad constant type in class file %s",
1790 name_index, tbl_name, CHECK_NULL);
1791 guarantee_property(valid_symbol_at(descriptor_index),
1792 "Signature index %u in %s has bad constant type in class file %s",
1793 descriptor_index, tbl_name, CHECK_NULL);
1794
1795 const Symbol* const name = cp->symbol_at(name_index);
1796 const Symbol* const sig = cp->symbol_at(descriptor_index);
1797 verify_legal_field_name(name, CHECK_NULL);
1798 u2 extra_slot = 0;
1799 if (!isLVTT) {
1800 verify_legal_field_signature(name, sig, CHECK_NULL);
1801
1802 // 4894874: check special cases for double and long local variables
1803 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1804 sig == vmSymbols::type_signature(T_LONG)) {
1805 extra_slot = 1;
1806 }
1807 }
1808 guarantee_property((index + extra_slot) < max_locals,
1809 "Invalid index %u in %s in class file %s",
1810 index, tbl_name, CHECK_NULL);
1811 }
1812 }
1813 return localvariable_table_start;
1814 }
1815
1816 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1817 u4 code_attribute_length,
1818 TRAPS) {
1819 assert(cfs != nullptr, "invariant");
1820
1821 if (0 == code_attribute_length) {
1822 return nullptr;
1823 }
1824
1825 const u1* const stackmap_table_start = cfs->current();
1826 assert(stackmap_table_start != nullptr, "null stackmap table");
1827
1828 // check code_attribute_length
1829 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1830
1831 return stackmap_table_start;
1832 }
1833
1834 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1835 u2* const checked_exceptions_length,
1836 u4 method_attribute_length,
1837 TRAPS) {
1838 assert(cfs != nullptr, "invariant");
1839 assert(checked_exceptions_length != nullptr, "invariant");
1840
1841 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1842 *checked_exceptions_length = cfs->get_u2_fast();
1843 const unsigned int size =
1844 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1845 const unsafe_u2* const checked_exceptions_start = cfs->current();
1846 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1847 if (!_need_verify) {
1848 cfs->skip_u2_fast(size);
1849 } else {
1850 // Verify each value in the checked exception table
1851 u2 checked_exception;
1852 const u2 len = *checked_exceptions_length;
1853 cfs->guarantee_more(2 * len, CHECK_NULL);
1854 for (int i = 0; i < len; i++) {
1855 checked_exception = cfs->get_u2_fast();
1856 guarantee_property(
1857 valid_klass_reference_at(checked_exception),
1858 "Exception name has bad type at constant pool %u in class file %s",
1859 checked_exception, CHECK_NULL);
1860 }
1861 }
1862 // check exceptions attribute length
1863 if (_need_verify) {
1864 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1865 sizeof(u2) * size),
1866 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1867 }
1868 return checked_exceptions_start;
1869 }
1870
1871 void ClassFileParser::throwIllegalSignature(const char* type,
1872 const Symbol* name,
1873 const Symbol* sig,
1874 TRAPS) const {
1875 assert(name != nullptr, "invariant");
1876 assert(sig != nullptr, "invariant");
1877
1878 ResourceMark rm(THREAD);
1879 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1880 Exceptions::fthrow(THREAD_AND_LOCATION,
1881 vmSymbols::java_lang_ClassFormatError(),
1882 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1883 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1884 }
1885
1886 AnnotationCollector::ID
1887 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1888 const Symbol* name,
1889 const bool can_access_vm_annotations) {
1890 const vmSymbolID sid = vmSymbols::find_sid(name);
1891 // Privileged code can use all annotations. Other code silently drops some.
1892 const bool privileged = loader_data->is_boot_class_loader_data() ||
1893 loader_data->is_platform_class_loader_data() ||
1894 can_access_vm_annotations;
1895 switch (sid) {
1896 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1897 if (_location != _in_method) break; // only allow for methods
1898 if (!privileged) break; // only allow in privileged code
1899 return _method_CallerSensitive;
1900 }
1901 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1902 if (_location != _in_method) break; // only allow for methods
1903 if (!privileged) break; // only allow in privileged code
1904 return _method_ForceInline;
1905 }
1906 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1907 if (_location != _in_method) break; // only allow for methods
1908 if (!privileged) break; // only allow in privileged code
1909 return _method_DontInline;
1910 }
1911 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1912 if (_location != _in_method) break; // only allow for methods
1913 if (!privileged) break; // only allow in privileged code
1914 return _method_ChangesCurrentThread;
1915 }
1916 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1917 if (_location != _in_method) break; // only allow for methods
1918 if (!privileged) break; // only allow in privileged code
1919 return _method_JvmtiHideEvents;
1920 }
1921 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1922 if (_location != _in_method) break; // only allow for methods
1923 if (!privileged) break; // only allow in privileged code
1924 return _method_JvmtiMountTransition;
1925 }
1926 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1927 if (_location != _in_method) break; // only allow for methods
1928 if (!privileged) break; // only allow in privileged code
1929 return _method_InjectedProfile;
1930 }
1931 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1932 if (_location != _in_method) break; // only allow for methods
1933 if (!privileged) break; // only allow in privileged code
1934 return _method_LambdaForm_Compiled;
1935 }
1936 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1937 if (_location != _in_method) break; // only allow for methods
1938 if (!privileged) break; // only allow in privileged code
1939 return _method_Hidden;
1940 }
1941 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1942 if (_location != _in_method) break; // only allow for methods
1943 if (!privileged) break; // only allow in privileged code
1944 return _method_Scoped;
1945 }
1946 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1947 if (_location != _in_method) break; // only allow for methods
1948 if (!privileged) break; // only allow in privileged code
1949 return _method_IntrinsicCandidate;
1950 }
1951 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1952 if (_location != _in_field) break; // only allow for fields
1953 if (!privileged) break; // only allow in privileged code
1954 return _field_Stable;
1955 }
1956 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1957 if (_location != _in_field && _location != _in_class) {
1958 break; // only allow for fields and classes
1959 }
1960 if (!EnableContended || (RestrictContended && !privileged)) {
1961 break; // honor privileges
1962 }
1963 return _jdk_internal_vm_annotation_Contended;
1964 }
1965 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1966 if (_location != _in_method) break; // only allow for methods
1967 if (RestrictReservedStack && !privileged) break; // honor privileges
1968 return _jdk_internal_vm_annotation_ReservedStackAccess;
1969 }
1970 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1971 if (_location != _in_class) break; // only allow for classes
1972 if (!privileged) break; // only allow in privileged code
1973 return _jdk_internal_ValueBased;
1974 }
1975 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1976 if (_location != _in_class) break; // only allow for classes
1977 return _jdk_internal_LooselyConsistentValue;
1978 }
1979 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1980 if (_location != _in_field) break; // only allow for fields
1981 return _jdk_internal_NullRestricted;
1982 }
1983 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1984 return _java_lang_Deprecated;
1985 }
1986 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1987 if (_location != _in_class) break; // only allow for classes
1988 if (!privileged) break; // only allow in privileged code
1989 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1990 }
1991 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1992 if (_location != _in_method) break; // only allow for methods
1993 if (!privileged) break; // only allow in privileged code
1994 return _method_AOTRuntimeSetup;
1995 }
1996 default: {
1997 break;
1998 }
1999 }
2000 return AnnotationCollector::_unknown;
2001 }
2002
2003 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2004 if (is_contended())
2005 // Setting the contended group also sets the contended bit in field flags
2006 f->set_contended_group(contended_group());
2007 if (is_stable())
2008 (f->field_flags_addr())->update_stable(true);
2009 }
2010
2011 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2012 // If there's an error deallocate metadata for field annotations
2013 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2014 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2015 }
2016
2017 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2018 if (has_annotation(_method_CallerSensitive))
2019 m->set_caller_sensitive();
2020 if (has_annotation(_method_ForceInline))
2021 m->set_force_inline();
2022 if (has_annotation(_method_DontInline))
2023 m->set_dont_inline();
2024 if (has_annotation(_method_ChangesCurrentThread))
2025 m->set_changes_current_thread();
2026 if (has_annotation(_method_JvmtiHideEvents))
2027 m->set_jvmti_hide_events();
2028 if (has_annotation(_method_JvmtiMountTransition))
2029 m->set_jvmti_mount_transition();
2030 if (has_annotation(_method_InjectedProfile))
2031 m->set_has_injected_profile();
2032 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2033 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2034 if (has_annotation(_method_Hidden))
2035 m->set_is_hidden();
2036 if (has_annotation(_method_Scoped))
2037 m->set_scoped();
2038 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2039 m->set_intrinsic_candidate();
2040 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2041 m->set_has_reserved_stack_access();
2042 if (has_annotation(_java_lang_Deprecated))
2043 m->set_deprecated();
2044 if (has_annotation(_java_lang_Deprecated_for_removal))
2045 m->set_deprecated_for_removal();
2046 }
2047
2048 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2049 assert(ik != nullptr, "invariant");
2050 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2051 ik->set_is_contended(is_contended());
2052 }
2053 if (has_annotation(_jdk_internal_ValueBased)) {
2054 ik->set_has_value_based_class_annotation();
2055 if (DiagnoseSyncOnValueBasedClasses) {
2056 ik->set_is_value_based();
2057 }
2058 }
2059 if (has_annotation(_java_lang_Deprecated)) {
2060 Array<Method*>* methods = ik->methods();
2061 int length = ik->methods()->length();
2062 for (int i = 0; i < length; i++) {
2063 Method* m = methods->at(i);
2064 m->set_deprecated();
2065 }
2066 }
2067 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2068 Array<Method*>* methods = ik->methods();
2069 int length = ik->methods()->length();
2070 for (int i = 0; i < length; i++) {
2071 Method* m = methods->at(i);
2072 m->set_deprecated_for_removal();
2073 }
2074 }
2075 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) {
2076 ik->set_has_aot_safe_initializer();
2077 }
2078 }
2079
2080 #define MAX_ARGS_SIZE 255
2081 #define MAX_CODE_SIZE 65535
2082 #define INITIAL_MAX_LVT_NUMBER 256
2083
2084 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2085 *
2086 * Rules for LVT's and LVTT's are:
2087 * - There can be any number of LVT's and LVTT's.
2088 * - If there are n LVT's, it is the same as if there was just
2089 * one LVT containing all the entries from the n LVT's.
2090 * - There may be no more than one LVT entry per local variable.
2091 * Two LVT entries are 'equal' if these fields are the same:
2092 * start_pc, length, name, slot
2093 * - There may be no more than one LVTT entry per each LVT entry.
2094 * Each LVTT entry has to match some LVT entry.
2095 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2096 */
2097 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2098 int lvt_cnt,
2099 u2* const localvariable_table_length,
2100 const unsafe_u2** const localvariable_table_start,
2101 int lvtt_cnt,
2102 u2* const localvariable_type_table_length,
2103 const unsafe_u2** const localvariable_type_table_start,
2104 TRAPS) {
2105
2106 ResourceMark rm(THREAD);
2107
2108 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*,
2109 256, AnyObj::RESOURCE_AREA, mtInternal,
2110 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2111
2112 LVT_HashTable* const table = new LVT_HashTable();
2113
2114 // To fill LocalVariableTable in
2115 const Classfile_LVT_Element* cf_lvt;
2116 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2117
2118 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2119 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2120 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2121 copy_lvt_element(&cf_lvt[idx], lvt);
2122 // If no duplicates, add LVT elem in hashtable.
2123 if (table->put(*lvt, lvt) == false
2124 && _need_verify
2125 && _major_version >= JAVA_1_5_VERSION) {
2126 classfile_parse_error("Duplicated LocalVariableTable attribute "
2127 "entry for '%s' in class file %s",
2128 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2129 THREAD);
2130 return;
2131 }
2132 }
2133 }
2134
2135 // To merge LocalVariableTable and LocalVariableTypeTable
2136 const Classfile_LVT_Element* cf_lvtt;
2137 LocalVariableTableElement lvtt_elem;
2138
2139 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2140 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2141 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2142 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2143 LocalVariableTableElement** entry = table->get(lvtt_elem);
2144 if (entry == nullptr) {
2145 if (_need_verify) {
2146 classfile_parse_error("LVTT entry for '%s' in class file %s "
2147 "does not match any LVT entry",
2148 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2149 THREAD);
2150 return;
2151 }
2152 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2153 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2154 "entry for '%s' in class file %s",
2155 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2156 THREAD);
2157 return;
2158 } else {
2159 // to add generic signatures into LocalVariableTable
2160 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2161 }
2162 }
2163 }
2164 }
2165
2166
2167 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2168 const u1* runtime_visible_annotations,
2169 int runtime_visible_annotations_length,
2170 const u1* runtime_visible_parameter_annotations,
2171 int runtime_visible_parameter_annotations_length,
2172 const u1* runtime_visible_type_annotations,
2173 int runtime_visible_type_annotations_length,
2174 const u1* annotation_default,
2175 int annotation_default_length,
2176 TRAPS) {
2177
2178 AnnotationArray* a;
2179
2180 if (runtime_visible_annotations_length > 0) {
2181 a = allocate_annotations(runtime_visible_annotations,
2182 runtime_visible_annotations_length,
2183 CHECK);
2184 cm->set_method_annotations(a);
2185 }
2186
2187 if (runtime_visible_parameter_annotations_length > 0) {
2188 a = allocate_annotations(runtime_visible_parameter_annotations,
2189 runtime_visible_parameter_annotations_length,
2190 CHECK);
2191 cm->set_parameter_annotations(a);
2192 }
2193
2194 if (annotation_default_length > 0) {
2195 a = allocate_annotations(annotation_default,
2196 annotation_default_length,
2197 CHECK);
2198 cm->set_default_annotations(a);
2199 }
2200
2201 if (runtime_visible_type_annotations_length > 0) {
2202 a = allocate_annotations(runtime_visible_type_annotations,
2203 runtime_visible_type_annotations_length,
2204 CHECK);
2205 cm->set_type_annotations(a);
2206 }
2207 }
2208
2209
2210 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2211 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2212 // Method* to save footprint, so we only know the size of the resulting Method* when the
2213 // entire method attribute is parsed.
2214 //
2215 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2216
2217 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2218 bool is_interface,
2219 bool is_value_class,
2220 bool is_abstract_class,
2221 const ConstantPool* cp,
2222 bool* const has_localvariable_table,
2223 TRAPS) {
2224 assert(cfs != nullptr, "invariant");
2225 assert(cp != nullptr, "invariant");
2226 assert(has_localvariable_table != nullptr, "invariant");
2227
2228 ResourceMark rm(THREAD);
2229 // Parse fixed parts:
2230 // access_flags, name_index, descriptor_index, attributes_count
2231 cfs->guarantee_more(8, CHECK_NULL);
2232
2233 u2 flags = cfs->get_u2_fast();
2234 const u2 name_index = cfs->get_u2_fast();
2235 const int cp_size = cp->length();
2236 guarantee_property(
2237 valid_symbol_at(name_index),
2238 "Illegal constant pool index %u for method name in class file %s",
2239 name_index, CHECK_NULL);
2240 const Symbol* const name = cp->symbol_at(name_index);
2241 verify_legal_method_name(name, CHECK_NULL);
2242
2243 const u2 signature_index = cfs->get_u2_fast();
2244 guarantee_property(
2245 valid_symbol_at(signature_index),
2246 "Illegal constant pool index %u for method signature in class file %s",
2247 signature_index, CHECK_NULL);
2248 const Symbol* const signature = cp->symbol_at(signature_index);
2249
2250 if (name == vmSymbols::class_initializer_name()) {
2251 // We ignore the other access flags for a valid class initializer.
2252 // (JVM Spec 2nd ed., chapter 4.6)
2253 if (_major_version < 51) { // backward compatibility
2254 flags = JVM_ACC_STATIC;
2255 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2256 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2257 } else {
2258 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2259 return nullptr;
2260 }
2261 } else {
2262 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2263 }
2264
2265 if (name == vmSymbols::object_initializer_name() && is_interface) {
2266 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2267 return nullptr;
2268 }
2269
2270 if (EnableValhalla) {
2271 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2272 && ((flags & JVM_ACC_STATIC) == 0 )
2273 && !_access_flags.is_identity_class()) {
2274 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2275 return nullptr;
2276 }
2277 }
2278
2279 int args_size = -1; // only used when _need_verify is true
2280 if (_need_verify) {
2281 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2282 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2283 verify_legal_method_signature(name, signature, CHECK_NULL);
2284 if (args_size > MAX_ARGS_SIZE) {
2285 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2286 return nullptr;
2287 }
2288 }
2289
2290 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2291
2292 // Default values for code and exceptions attribute elements
2293 u2 max_stack = 0;
2294 u2 max_locals = 0;
2295 u4 code_length = 0;
2296 const u1* code_start = nullptr;
2297 u2 exception_table_length = 0;
2298 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2299 Array<int>* exception_handlers = Universe::the_empty_int_array();
2300 u2 checked_exceptions_length = 0;
2301 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2302 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2303 int linenumber_table_length = 0;
2304 int total_lvt_length = 0;
2305 u2 lvt_cnt = 0;
2306 u2 lvtt_cnt = 0;
2307 bool lvt_allocated = false;
2308 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2309 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2310 u2* localvariable_table_length = nullptr;
2311 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2312 u2* localvariable_type_table_length = nullptr;
2313 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2314 int method_parameters_length = -1;
2315 const u1* method_parameters_data = nullptr;
2316 bool method_parameters_seen = false;
2317 bool parsed_code_attribute = false;
2318 bool parsed_checked_exceptions_attribute = false;
2319 bool parsed_stackmap_attribute = false;
2320 // stackmap attribute - JDK1.5
2321 const u1* stackmap_data = nullptr;
2322 int stackmap_data_length = 0;
2323 u2 generic_signature_index = 0;
2324 MethodAnnotationCollector parsed_annotations;
2325 const u1* runtime_visible_annotations = nullptr;
2326 int runtime_visible_annotations_length = 0;
2327 const u1* runtime_visible_parameter_annotations = nullptr;
2328 int runtime_visible_parameter_annotations_length = 0;
2329 const u1* runtime_visible_type_annotations = nullptr;
2330 int runtime_visible_type_annotations_length = 0;
2331 bool runtime_invisible_annotations_exists = false;
2332 bool runtime_invisible_type_annotations_exists = false;
2333 bool runtime_invisible_parameter_annotations_exists = false;
2334 const u1* annotation_default = nullptr;
2335 int annotation_default_length = 0;
2336
2337 // Parse code and exceptions attribute
2338 u2 method_attributes_count = cfs->get_u2_fast();
2339 while (method_attributes_count--) {
2340 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2341 const u2 method_attribute_name_index = cfs->get_u2_fast();
2342 const u4 method_attribute_length = cfs->get_u4_fast();
2343 guarantee_property(
2344 valid_symbol_at(method_attribute_name_index),
2345 "Invalid method attribute name index %u in class file %s",
2346 method_attribute_name_index, CHECK_NULL);
2347
2348 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2349 if (method_attribute_name == vmSymbols::tag_code()) {
2350 // Parse Code attribute
2351 if (_need_verify) {
2352 guarantee_property(
2353 !access_flags.is_native() && !access_flags.is_abstract(),
2354 "Code attribute in native or abstract methods in class file %s",
2355 CHECK_NULL);
2356 }
2357 if (parsed_code_attribute) {
2358 classfile_parse_error("Multiple Code attributes in class file %s",
2359 THREAD);
2360 return nullptr;
2361 }
2362 parsed_code_attribute = true;
2363
2364 // Stack size, locals size, and code size
2365 cfs->guarantee_more(8, CHECK_NULL);
2366 max_stack = cfs->get_u2_fast();
2367 max_locals = cfs->get_u2_fast();
2368 code_length = cfs->get_u4_fast();
2369 if (_need_verify) {
2370 guarantee_property(args_size <= max_locals,
2371 "Arguments can't fit into locals in class file %s",
2372 CHECK_NULL);
2373 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2374 "Invalid method Code length %u in class file %s",
2375 code_length, CHECK_NULL);
2376 }
2377 // Code pointer
2378 code_start = cfs->current();
2379 assert(code_start != nullptr, "null code start");
2380 cfs->guarantee_more(code_length, CHECK_NULL);
2381 cfs->skip_u1_fast(code_length);
2382
2383 // Exception handler table
2384 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2385 exception_table_length = cfs->get_u2_fast();
2386 if (exception_table_length > 0) {
2387 exception_table_start = parse_exception_table(cfs,
2388 code_length,
2389 exception_table_length,
2390 CHECK_NULL);
2391 }
2392
2393 // Parse additional attributes in code attribute
2394 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2395 u2 code_attributes_count = cfs->get_u2_fast();
2396
2397 unsigned int calculated_attribute_length = 0;
2398
2399 calculated_attribute_length =
2400 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2401 calculated_attribute_length += checked_cast<unsigned int>(
2402 code_length +
2403 sizeof(exception_table_length) +
2404 sizeof(code_attributes_count) +
2405 exception_table_length *
2406 ( sizeof(u2) + // start_pc
2407 sizeof(u2) + // end_pc
2408 sizeof(u2) + // handler_pc
2409 sizeof(u2) )); // catch_type_index
2410
2411 while (code_attributes_count--) {
2412 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2413 const u2 code_attribute_name_index = cfs->get_u2_fast();
2414 const u4 code_attribute_length = cfs->get_u4_fast();
2415 calculated_attribute_length += code_attribute_length +
2416 (unsigned)sizeof(code_attribute_name_index) +
2417 (unsigned)sizeof(code_attribute_length);
2418 guarantee_property(valid_symbol_at(code_attribute_name_index),
2419 "Invalid code attribute name index %u in class file %s",
2420 code_attribute_name_index,
2421 CHECK_NULL);
2422 if (LoadLineNumberTables &&
2423 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2424 // Parse and compress line number table
2425 parse_linenumber_table(code_attribute_length,
2426 code_length,
2427 &linenumber_table,
2428 CHECK_NULL);
2429
2430 } else if (LoadLocalVariableTables &&
2431 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2432 // Parse local variable table
2433 if (!lvt_allocated) {
2434 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2435 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2436 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2437 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2438 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2439 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2440 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2441 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2442 lvt_allocated = true;
2443 }
2444 if (lvt_cnt == max_lvt_cnt) {
2445 max_lvt_cnt <<= 1;
2446 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2447 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2448 }
2449 localvariable_table_start[lvt_cnt] =
2450 parse_localvariable_table(cfs,
2451 code_length,
2452 max_locals,
2453 code_attribute_length,
2454 &localvariable_table_length[lvt_cnt],
2455 false, // is not LVTT
2456 CHECK_NULL);
2457 total_lvt_length += localvariable_table_length[lvt_cnt];
2458 lvt_cnt++;
2459 } else if (LoadLocalVariableTypeTables &&
2460 _major_version >= JAVA_1_5_VERSION &&
2461 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2462 if (!lvt_allocated) {
2463 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2464 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2465 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2466 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2467 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2468 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2469 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2470 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2471 lvt_allocated = true;
2472 }
2473 // Parse local variable type table
2474 if (lvtt_cnt == max_lvtt_cnt) {
2475 max_lvtt_cnt <<= 1;
2476 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2477 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2478 }
2479 localvariable_type_table_start[lvtt_cnt] =
2480 parse_localvariable_table(cfs,
2481 code_length,
2482 max_locals,
2483 code_attribute_length,
2484 &localvariable_type_table_length[lvtt_cnt],
2485 true, // is LVTT
2486 CHECK_NULL);
2487 lvtt_cnt++;
2488 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2489 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2490 // Stack map is only needed by the new verifier in JDK1.5.
2491 if (parsed_stackmap_attribute) {
2492 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2493 return nullptr;
2494 }
2495 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2496 stackmap_data_length = code_attribute_length;
2497 parsed_stackmap_attribute = true;
2498 } else {
2499 // Skip unknown attributes
2500 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2501 }
2502 }
2503 // check method attribute length
2504 if (_need_verify) {
2505 guarantee_property(method_attribute_length == calculated_attribute_length,
2506 "Code segment has wrong length in class file %s",
2507 CHECK_NULL);
2508 }
2509 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2510 // Parse Exceptions attribute
2511 if (parsed_checked_exceptions_attribute) {
2512 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2513 THREAD);
2514 return nullptr;
2515 }
2516 parsed_checked_exceptions_attribute = true;
2517 checked_exceptions_start =
2518 parse_checked_exceptions(cfs,
2519 &checked_exceptions_length,
2520 method_attribute_length,
2521 CHECK_NULL);
2522 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2523 // reject multiple method parameters
2524 if (method_parameters_seen) {
2525 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2526 THREAD);
2527 return nullptr;
2528 }
2529 method_parameters_seen = true;
2530 method_parameters_length = cfs->get_u1_fast();
2531 const u4 real_length = (method_parameters_length * 4u) + 1u;
2532 if (method_attribute_length != real_length) {
2533 classfile_parse_error(
2534 "Invalid MethodParameters method attribute length %u in class file",
2535 method_attribute_length, THREAD);
2536 return nullptr;
2537 }
2538 method_parameters_data = cfs->current();
2539 cfs->skip_u2_fast(method_parameters_length);
2540 cfs->skip_u2_fast(method_parameters_length);
2541 // ignore this attribute if it cannot be reflected
2542 if (!vmClasses::reflect_Parameter_klass_is_loaded())
2543 method_parameters_length = -1;
2544 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2545 if (method_attribute_length != 0) {
2546 classfile_parse_error(
2547 "Invalid Synthetic method attribute length %u in class file %s",
2548 method_attribute_length, THREAD);
2549 return nullptr;
2550 }
2551 // Should we check that there hasn't already been a synthetic attribute?
2552 access_flags.set_is_synthetic();
2553 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2554 if (method_attribute_length != 0) {
2555 classfile_parse_error(
2556 "Invalid Deprecated method attribute length %u in class file %s",
2557 method_attribute_length, THREAD);
2558 return nullptr;
2559 }
2560 } else if (_major_version >= JAVA_1_5_VERSION) {
2561 if (method_attribute_name == vmSymbols::tag_signature()) {
2562 if (generic_signature_index != 0) {
2563 classfile_parse_error(
2564 "Multiple Signature attributes for method in class file %s",
2565 THREAD);
2566 return nullptr;
2567 }
2568 if (method_attribute_length != 2) {
2569 classfile_parse_error(
2570 "Invalid Signature attribute length %u in class file %s",
2571 method_attribute_length, THREAD);
2572 return nullptr;
2573 }
2574 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2575 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2576 if (runtime_visible_annotations != nullptr) {
2577 classfile_parse_error(
2578 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2579 THREAD);
2580 return nullptr;
2581 }
2582 runtime_visible_annotations_length = method_attribute_length;
2583 runtime_visible_annotations = cfs->current();
2584 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2585 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2586 parse_annotations(cp,
2587 runtime_visible_annotations,
2588 runtime_visible_annotations_length,
2589 &parsed_annotations,
2590 _loader_data,
2591 _can_access_vm_annotations);
2592 cfs->skip_u1_fast(runtime_visible_annotations_length);
2593 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2594 if (runtime_invisible_annotations_exists) {
2595 classfile_parse_error(
2596 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2597 THREAD);
2598 return nullptr;
2599 }
2600 runtime_invisible_annotations_exists = true;
2601 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2602 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2603 if (runtime_visible_parameter_annotations != nullptr) {
2604 classfile_parse_error(
2605 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2606 THREAD);
2607 return nullptr;
2608 }
2609 runtime_visible_parameter_annotations_length = method_attribute_length;
2610 runtime_visible_parameter_annotations = cfs->current();
2611 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2612 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2613 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2614 if (runtime_invisible_parameter_annotations_exists) {
2615 classfile_parse_error(
2616 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2617 THREAD);
2618 return nullptr;
2619 }
2620 runtime_invisible_parameter_annotations_exists = true;
2621 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2622 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2623 if (annotation_default != nullptr) {
2624 classfile_parse_error(
2625 "Multiple AnnotationDefault attributes for method in class file %s",
2626 THREAD);
2627 return nullptr;
2628 }
2629 annotation_default_length = method_attribute_length;
2630 annotation_default = cfs->current();
2631 assert(annotation_default != nullptr, "null annotation default");
2632 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2633 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2634 if (runtime_visible_type_annotations != nullptr) {
2635 classfile_parse_error(
2636 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2637 THREAD);
2638 return nullptr;
2639 }
2640 runtime_visible_type_annotations_length = method_attribute_length;
2641 runtime_visible_type_annotations = cfs->current();
2642 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2643 // No need for the VM to parse Type annotations
2644 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2645 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2646 if (runtime_invisible_type_annotations_exists) {
2647 classfile_parse_error(
2648 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2649 THREAD);
2650 return nullptr;
2651 }
2652 runtime_invisible_type_annotations_exists = true;
2653 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2654 } else {
2655 // Skip unknown attributes
2656 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2657 }
2658 } else {
2659 // Skip unknown attributes
2660 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2661 }
2662 }
2663
2664 if (linenumber_table != nullptr) {
2665 linenumber_table->write_terminator();
2666 linenumber_table_length = linenumber_table->position();
2667 }
2668
2669 // Make sure there's at least one Code attribute in non-native/non-abstract method
2670 if (_need_verify) {
2671 guarantee_property(access_flags.is_native() ||
2672 access_flags.is_abstract() ||
2673 parsed_code_attribute,
2674 "Absent Code attribute in method that is not native or abstract in class file %s",
2675 CHECK_NULL);
2676 }
2677
2678 // All sizing information for a Method* is finally available, now create it
2679 InlineTableSizes sizes(
2680 total_lvt_length,
2681 linenumber_table_length,
2682 exception_table_length,
2683 checked_exceptions_length,
2684 method_parameters_length,
2685 generic_signature_index,
2686 runtime_visible_annotations_length,
2687 runtime_visible_parameter_annotations_length,
2688 runtime_visible_type_annotations_length,
2689 annotation_default_length,
2690 0);
2691
2692 Method* const m = Method::allocate(_loader_data,
2693 code_length,
2694 access_flags,
2695 &sizes,
2696 ConstMethod::NORMAL,
2697 _cp->symbol_at(name_index),
2698 CHECK_NULL);
2699
2700 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2701
2702 // Fill in information from fixed part (access_flags already set)
2703 m->set_constants(_cp);
2704 m->set_name_index(name_index);
2705 m->set_signature_index(signature_index);
2706 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2707 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2708
2709 // Fill in code attribute information
2710 m->set_max_stack(max_stack);
2711 m->set_max_locals(max_locals);
2712 if (stackmap_data != nullptr) {
2713 m->constMethod()->copy_stackmap_data(_loader_data,
2714 (u1*)stackmap_data,
2715 stackmap_data_length,
2716 CHECK_NULL);
2717 }
2718
2719 // Copy byte codes
2720 m->set_code((u1*)code_start);
2721
2722 // Copy line number table
2723 if (linenumber_table != nullptr) {
2724 memcpy(m->compressed_linenumber_table(),
2725 linenumber_table->buffer(),
2726 linenumber_table_length);
2727 }
2728
2729 // Copy exception table
2730 if (exception_table_length > 0) {
2731 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2732 m->exception_table_start(),
2733 exception_table_length * sizeof(ExceptionTableElement),
2734 sizeof(u2));
2735 }
2736
2737 // Copy method parameters
2738 if (method_parameters_length > 0) {
2739 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2740 for (int i = 0; i < method_parameters_length; i++) {
2741 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2742 method_parameters_data += 2;
2743 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2744 method_parameters_data += 2;
2745 }
2746 }
2747
2748 // Copy checked exceptions
2749 if (checked_exceptions_length > 0) {
2750 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2751 m->checked_exceptions_start(),
2752 checked_exceptions_length * sizeof(CheckedExceptionElement),
2753 sizeof(u2));
2754 }
2755
2756 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2757 if (total_lvt_length > 0) {
2758 *has_localvariable_table = true;
2759 copy_localvariable_table(m->constMethod(),
2760 lvt_cnt,
2761 localvariable_table_length,
2762 localvariable_table_start,
2763 lvtt_cnt,
2764 localvariable_type_table_length,
2765 localvariable_type_table_start,
2766 CHECK_NULL);
2767 }
2768
2769 if (parsed_annotations.has_any_annotations())
2770 parsed_annotations.apply_to(methodHandle(THREAD, m));
2771
2772 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2773 m->set_is_hidden();
2774 }
2775 if (parsed_annotations.has_aot_runtime_setup()) {
2776 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() ||
2777 !access_flags.is_private() || !access_flags.is_static()) {
2778 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL);
2779 }
2780 _has_aot_runtime_setup_method = true;
2781 }
2782
2783 // Copy annotations
2784 copy_method_annotations(m->constMethod(),
2785 runtime_visible_annotations,
2786 runtime_visible_annotations_length,
2787 runtime_visible_parameter_annotations,
2788 runtime_visible_parameter_annotations_length,
2789 runtime_visible_type_annotations,
2790 runtime_visible_type_annotations_length,
2791 annotation_default,
2792 annotation_default_length,
2793 CHECK_NULL);
2794
2795 if (InstanceKlass::is_finalization_enabled() &&
2796 name == vmSymbols::finalize_method_name() &&
2797 signature == vmSymbols::void_method_signature()) {
2798 if (m->is_empty_method()) {
2799 _has_empty_finalizer = true;
2800 } else {
2801 _has_finalizer = true;
2802 }
2803 }
2804
2805 NOT_PRODUCT(m->verify());
2806 return m;
2807 }
2808
2809
2810 // Side-effects: populates the _methods field in the parser
2811 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2812 bool is_interface,
2813 bool is_value_class,
2814 bool is_abstract_type,
2815 bool* const has_localvariable_table,
2816 bool* has_final_method,
2817 bool* declares_nonstatic_concrete_methods,
2818 TRAPS) {
2819 assert(cfs != nullptr, "invariant");
2820 assert(has_localvariable_table != nullptr, "invariant");
2821 assert(has_final_method != nullptr, "invariant");
2822 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2823
2824 assert(nullptr == _methods, "invariant");
2825
2826 cfs->guarantee_more(2, CHECK); // length
2827 const u2 length = cfs->get_u2_fast();
2828 if (length == 0) {
2829 _methods = Universe::the_empty_method_array();
2830 } else {
2831 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2832 length,
2833 nullptr,
2834 CHECK);
2835
2836 for (int index = 0; index < length; index++) {
2837 Method* method = parse_method(cfs,
2838 is_interface,
2839 is_value_class,
2840 is_abstract_type,
2841 _cp,
2842 has_localvariable_table,
2843 CHECK);
2844
2845 if (method->is_final()) {
2846 *has_final_method = true;
2847 }
2848 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2849 // used for interface initialization, and default method inheritance analysis
2850 if (is_interface && !(*declares_nonstatic_concrete_methods)
2851 && !method->is_abstract() && !method->is_static()) {
2852 *declares_nonstatic_concrete_methods = true;
2853 }
2854 _methods->at_put(index, method);
2855 }
2856
2857 if (_need_verify && length > 1) {
2858 // Check duplicated methods
2859 ResourceMark rm(THREAD);
2860 // Set containing name-signature pairs
2861 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2862 for (int i = 0; i < length; i++) {
2863 const Method* const m = _methods->at(i);
2864 NameSigHash name_and_sig(m->name(), m->signature());
2865 // If no duplicates, add name/signature in hashtable names_and_sigs.
2866 if(!names_and_sigs->put(name_and_sig, 0)) {
2867 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2868 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2869 return;
2870 }
2871 }
2872 }
2873 }
2874 }
2875
2876 static const intArray* sort_methods(Array<Method*>* methods) {
2877 const int length = methods->length();
2878 // If JVMTI original method ordering or sharing is enabled we have to
2879 // remember the original class file ordering.
2880 // We temporarily use the vtable_index field in the Method* to store the
2881 // class file index, so we can read in after calling qsort.
2882 // Put the method ordering in the shared archive.
2883 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2884 for (int index = 0; index < length; index++) {
2885 Method* const m = methods->at(index);
2886 assert(!m->valid_vtable_index(), "vtable index should not be set");
2887 m->set_vtable_index(index);
2888 }
2889 }
2890 // Sort method array by ascending method name (for faster lookups & vtable construction)
2891 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2892 Method::sort_methods(methods);
2893
2894 intArray* method_ordering = nullptr;
2895 // If JVMTI original method ordering or sharing is enabled construct int
2896 // array remembering the original ordering
2897 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2898 method_ordering = new intArray(length, length, -1);
2899 for (int index = 0; index < length; index++) {
2900 Method* const m = methods->at(index);
2901 const int old_index = m->vtable_index();
2902 assert(old_index >= 0 && old_index < length, "invalid method index");
2903 method_ordering->at_put(index, old_index);
2904 m->set_vtable_index(Method::invalid_vtable_index);
2905 }
2906 }
2907 return method_ordering;
2908 }
2909
2910 // Parse generic_signature attribute for methods and fields
2911 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2912 TRAPS) {
2913 assert(cfs != nullptr, "invariant");
2914
2915 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2916 const u2 generic_signature_index = cfs->get_u2_fast();
2917 guarantee_property(
2918 valid_symbol_at(generic_signature_index),
2919 "Invalid Signature attribute at constant pool index %u in class file %s",
2920 generic_signature_index, CHECK_0);
2921 return generic_signature_index;
2922 }
2923
2924 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2925 TRAPS) {
2926
2927 assert(cfs != nullptr, "invariant");
2928
2929 cfs->guarantee_more(2, CHECK); // sourcefile_index
2930 const u2 sourcefile_index = cfs->get_u2_fast();
2931 guarantee_property(
2932 valid_symbol_at(sourcefile_index),
2933 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2934 sourcefile_index, CHECK);
2935 set_class_sourcefile_index(sourcefile_index);
2936 }
2937
2938 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2939 int length,
2940 TRAPS) {
2941 assert(cfs != nullptr, "invariant");
2942
2943 const u1* const sde_buffer = cfs->current();
2944 assert(sde_buffer != nullptr, "null sde buffer");
2945
2946 // Don't bother storing it if there is no way to retrieve it
2947 if (JvmtiExport::can_get_source_debug_extension()) {
2948 assert((length+1) > length, "Overflow checking");
2949 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2950 for (int i = 0; i < length; i++) {
2951 sde[i] = sde_buffer[i];
2952 }
2953 sde[length] = '\0';
2954 set_class_sde_buffer((const char*)sde, length);
2955 }
2956 // Got utf8 string, set stream position forward
2957 cfs->skip_u1(length, CHECK);
2958 }
2959
2960
2961 // Inner classes can be static, private or protected (classic VM does this)
2962 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2963 JVM_ACC_PRIVATE | \
2964 JVM_ACC_PROTECTED | \
2965 JVM_ACC_STATIC \
2966 )
2967
2968 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2969 // Return -1 if none is found.
2970 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2971 Symbol* cp_klass_name = cp->klass_name_at(inner);
2972 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2973 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2974 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2975 return idx;
2976 }
2977 }
2978 return -1;
2979 }
2980
2981 // Return the outer_class_info_index for the InnerClasses entry containing the
2982 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2983 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2984 if (inner == 0) return -1;
2985 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2986 if (idx == -1) return -1;
2987 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2988 return result;
2989 }
2990
2991 // Return true if circularity is found, false if no circularity is found.
2992 // Use Floyd's cycle finding algorithm.
2993 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2994 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2995 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2996
2997 while (fast != -1 && fast != 0) {
2998 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2999 return true; // found a circularity
3000 }
3001 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3002 if (fast == -1) return false;
3003 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3004 if (fast == -1) return false;
3005 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3006 assert(slow != -1, "sanity check");
3007 }
3008 return false;
3009 }
3010
3011 // Loop through each InnerClasses entry checking for circularities and duplications
3012 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3013 // return true if a circularity or entries with duplicate inner_class_info_indexes
3014 // are found.
3015 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3016 // Loop through each InnerClasses entry.
3017 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3018 // Return true if there are circular entries.
3019 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3020 return true;
3021 }
3022 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3023 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3024 y += InstanceKlass::inner_class_next_offset) {
3025
3026 // 4347400: make sure there's no duplicate entry in the classes array
3027 if (_major_version >= JAVA_1_5_VERSION) {
3028 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3029 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3030 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3031 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3032 "Duplicate entry in InnerClasses attribute in class file %s",
3033 CHECK_(true));
3034 }
3035 // Return true if there are two entries with the same inner_class_info_index.
3036 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3037 return true;
3038 }
3039 }
3040 }
3041 return false;
3042 }
3043
3044 // Return number of classes in the inner classes attribute table
3045 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3046 const ConstantPool* cp,
3047 const u1* const inner_classes_attribute_start,
3048 bool parsed_enclosingmethod_attribute,
3049 u2 enclosing_method_class_index,
3050 u2 enclosing_method_method_index,
3051 TRAPS) {
3052 const u1* const current_mark = cfs->current();
3053 u2 length = 0;
3054 if (inner_classes_attribute_start != nullptr) {
3055 cfs->set_current(inner_classes_attribute_start);
3056 cfs->guarantee_more(2, CHECK_0); // length
3057 length = cfs->get_u2_fast();
3058 }
3059
3060 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3061 // method data:
3062 // [inner_class_info_index,
3063 // outer_class_info_index,
3064 // inner_name_index,
3065 // inner_class_access_flags,
3066 // ...
3067 // enclosing_method_class_index,
3068 // enclosing_method_method_index]
3069 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3070 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3071 _inner_classes = inner_classes;
3072
3073 int index = 0;
3074 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3075 for (int n = 0; n < length; n++) {
3076 // Inner class index
3077 const u2 inner_class_info_index = cfs->get_u2_fast();
3078 guarantee_property(
3079 valid_klass_reference_at(inner_class_info_index),
3080 "inner_class_info_index %u has bad constant type in class file %s",
3081 inner_class_info_index, CHECK_0);
3082 // Outer class index
3083 const u2 outer_class_info_index = cfs->get_u2_fast();
3084 guarantee_property(
3085 outer_class_info_index == 0 ||
3086 valid_klass_reference_at(outer_class_info_index),
3087 "outer_class_info_index %u has bad constant type in class file %s",
3088 outer_class_info_index, CHECK_0);
3089
3090 if (outer_class_info_index != 0) {
3091 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3092 char* bytes = (char*)outer_class_name->bytes();
3093 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3094 "Outer class is an array class in class file %s", CHECK_0);
3095 }
3096 // Inner class name
3097 const u2 inner_name_index = cfs->get_u2_fast();
3098 guarantee_property(
3099 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3100 "inner_name_index %u has bad constant type in class file %s",
3101 inner_name_index, CHECK_0);
3102 if (_need_verify) {
3103 guarantee_property(inner_class_info_index != outer_class_info_index,
3104 "Class is both outer and inner class in class file %s", CHECK_0);
3105 }
3106
3107 // Access flags
3108 u2 flags;
3109 // JVM_ACC_MODULE is defined in JDK-9 and later.
3110 if (_major_version >= JAVA_9_VERSION) {
3111 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3112 } else {
3113 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3114 }
3115
3116 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3117 // Set abstract bit for old class files for backward compatibility
3118 flags |= JVM_ACC_ABSTRACT;
3119 }
3120
3121 if (!supports_inline_types()) {
3122 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3123 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3124 if (!is_module && !is_interface) {
3125 flags |= JVM_ACC_IDENTITY;
3126 }
3127 }
3128
3129 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3130 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3131 AccessFlags inner_access_flags(flags);
3132
3133 inner_classes->at_put(index++, inner_class_info_index);
3134 inner_classes->at_put(index++, outer_class_info_index);
3135 inner_classes->at_put(index++, inner_name_index);
3136 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3137 }
3138
3139 // Check for circular and duplicate entries.
3140 bool has_circularity = false;
3141 if (_need_verify) {
3142 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3143 if (has_circularity) {
3144 // If circularity check failed then ignore InnerClasses attribute.
3145 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3146 index = 0;
3147 if (parsed_enclosingmethod_attribute) {
3148 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3149 _inner_classes = inner_classes;
3150 } else {
3151 _inner_classes = Universe::the_empty_short_array();
3152 }
3153 }
3154 }
3155 // Set EnclosingMethod class and method indexes.
3156 if (parsed_enclosingmethod_attribute) {
3157 inner_classes->at_put(index++, enclosing_method_class_index);
3158 inner_classes->at_put(index++, enclosing_method_method_index);
3159 }
3160 assert(index == size || has_circularity, "wrong size");
3161
3162 // Restore buffer's current position.
3163 cfs->set_current(current_mark);
3164
3165 return length;
3166 }
3167
3168 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3169 const u1* const nest_members_attribute_start,
3170 TRAPS) {
3171 const u1* const current_mark = cfs->current();
3172 u2 length = 0;
3173 if (nest_members_attribute_start != nullptr) {
3174 cfs->set_current(nest_members_attribute_start);
3175 cfs->guarantee_more(2, CHECK_0); // length
3176 length = cfs->get_u2_fast();
3177 }
3178 const int size = length;
3179 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3180 _nest_members = nest_members;
3181
3182 int index = 0;
3183 cfs->guarantee_more(2 * length, CHECK_0);
3184 for (int n = 0; n < length; n++) {
3185 const u2 class_info_index = cfs->get_u2_fast();
3186 guarantee_property(
3187 valid_klass_reference_at(class_info_index),
3188 "Nest member class_info_index %u has bad constant type in class file %s",
3189 class_info_index, CHECK_0);
3190 nest_members->at_put(index++, class_info_index);
3191 }
3192 assert(index == size, "wrong size");
3193
3194 // Restore buffer's current position.
3195 cfs->set_current(current_mark);
3196
3197 return length;
3198 }
3199
3200 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3201 const u1* const permitted_subclasses_attribute_start,
3202 TRAPS) {
3203 const u1* const current_mark = cfs->current();
3204 u2 length = 0;
3205 if (permitted_subclasses_attribute_start != nullptr) {
3206 cfs->set_current(permitted_subclasses_attribute_start);
3207 cfs->guarantee_more(2, CHECK_0); // length
3208 length = cfs->get_u2_fast();
3209 }
3210 const int size = length;
3211 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3212 _permitted_subclasses = permitted_subclasses;
3213
3214 if (length > 0) {
3215 int index = 0;
3216 cfs->guarantee_more(2 * length, CHECK_0);
3217 for (int n = 0; n < length; n++) {
3218 const u2 class_info_index = cfs->get_u2_fast();
3219 guarantee_property(
3220 valid_klass_reference_at(class_info_index),
3221 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3222 class_info_index, CHECK_0);
3223 permitted_subclasses->at_put(index++, class_info_index);
3224 }
3225 assert(index == size, "wrong size");
3226 }
3227
3228 // Restore buffer's current position.
3229 cfs->set_current(current_mark);
3230
3231 return length;
3232 }
3233
3234 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3235 const u1* const loadable_descriptors_attribute_start,
3236 TRAPS) {
3237 const u1* const current_mark = cfs->current();
3238 u2 length = 0;
3239 if (loadable_descriptors_attribute_start != nullptr) {
3240 cfs->set_current(loadable_descriptors_attribute_start);
3241 cfs->guarantee_more(2, CHECK_0); // length
3242 length = cfs->get_u2_fast();
3243 }
3244 const int size = length;
3245 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3246 _loadable_descriptors = loadable_descriptors;
3247 if (length > 0) {
3248 int index = 0;
3249 cfs->guarantee_more(2 * length, CHECK_0);
3250 for (int n = 0; n < length; n++) {
3251 const u2 descriptor_index = cfs->get_u2_fast();
3252 guarantee_property(
3253 valid_symbol_at(descriptor_index),
3254 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3255 descriptor_index, CHECK_0);
3256 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3257 bool valid = legal_field_signature(descriptor, CHECK_0);
3258 if(!valid) {
3259 ResourceMark rm(THREAD);
3260 Exceptions::fthrow(THREAD_AND_LOCATION,
3261 vmSymbols::java_lang_ClassFormatError(),
3262 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3263 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3264 return 0;
3265 }
3266 loadable_descriptors->at_put(index++, descriptor_index);
3267 }
3268 assert(index == size, "wrong size");
3269 }
3270
3271 // Restore buffer's current position.
3272 cfs->set_current(current_mark);
3273
3274 return length;
3275 }
3276
3277 // Record {
3278 // u2 attribute_name_index;
3279 // u4 attribute_length;
3280 // u2 components_count;
3281 // component_info components[components_count];
3282 // }
3283 // component_info {
3284 // u2 name_index;
3285 // u2 descriptor_index
3286 // u2 attributes_count;
3287 // attribute_info_attributes[attributes_count];
3288 // }
3289 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3290 const ConstantPool* cp,
3291 const u1* const record_attribute_start,
3292 TRAPS) {
3293 const u1* const current_mark = cfs->current();
3294 int components_count = 0;
3295 unsigned int calculate_attr_size = 0;
3296 if (record_attribute_start != nullptr) {
3297 cfs->set_current(record_attribute_start);
3298 cfs->guarantee_more(2, CHECK_0); // num of components
3299 components_count = (int)cfs->get_u2_fast();
3300 calculate_attr_size = 2;
3301 }
3302
3303 Array<RecordComponent*>* const record_components =
3304 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3305 _record_components = record_components;
3306
3307 for (int x = 0; x < components_count; x++) {
3308 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3309
3310 const u2 name_index = cfs->get_u2_fast();
3311 guarantee_property(valid_symbol_at(name_index),
3312 "Invalid constant pool index %u for name in Record attribute in class file %s",
3313 name_index, CHECK_0);
3314 const Symbol* const name = cp->symbol_at(name_index);
3315 verify_legal_field_name(name, CHECK_0);
3316
3317 const u2 descriptor_index = cfs->get_u2_fast();
3318 guarantee_property(valid_symbol_at(descriptor_index),
3319 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3320 descriptor_index, CHECK_0);
3321 const Symbol* const descr = cp->symbol_at(descriptor_index);
3322 verify_legal_field_signature(name, descr, CHECK_0);
3323
3324 const u2 attributes_count = cfs->get_u2_fast();
3325 calculate_attr_size += 6;
3326 u2 generic_sig_index = 0;
3327 const u1* runtime_visible_annotations = nullptr;
3328 int runtime_visible_annotations_length = 0;
3329 bool runtime_invisible_annotations_exists = false;
3330 const u1* runtime_visible_type_annotations = nullptr;
3331 int runtime_visible_type_annotations_length = 0;
3332 bool runtime_invisible_type_annotations_exists = false;
3333
3334 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3335 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3336 for (int y = 0; y < attributes_count; y++) {
3337 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3338 const u2 attribute_name_index = cfs->get_u2_fast();
3339 const u4 attribute_length = cfs->get_u4_fast();
3340 calculate_attr_size += 6;
3341 guarantee_property(
3342 valid_symbol_at(attribute_name_index),
3343 "Invalid Record attribute name index %u in class file %s",
3344 attribute_name_index, CHECK_0);
3345
3346 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3347 if (attribute_name == vmSymbols::tag_signature()) {
3348 if (generic_sig_index != 0) {
3349 classfile_parse_error(
3350 "Multiple Signature attributes for Record component in class file %s",
3351 THREAD);
3352 return 0;
3353 }
3354 if (attribute_length != 2) {
3355 classfile_parse_error(
3356 "Invalid Signature attribute length %u in Record component in class file %s",
3357 attribute_length, THREAD);
3358 return 0;
3359 }
3360 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3361
3362 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3363 if (runtime_visible_annotations != nullptr) {
3364 classfile_parse_error(
3365 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3366 return 0;
3367 }
3368 runtime_visible_annotations_length = attribute_length;
3369 runtime_visible_annotations = cfs->current();
3370
3371 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3372 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3373 cfs->skip_u1_fast(runtime_visible_annotations_length);
3374
3375 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3376 if (runtime_invisible_annotations_exists) {
3377 classfile_parse_error(
3378 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3379 return 0;
3380 }
3381 runtime_invisible_annotations_exists = true;
3382 cfs->skip_u1(attribute_length, CHECK_0);
3383
3384 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3385 if (runtime_visible_type_annotations != nullptr) {
3386 classfile_parse_error(
3387 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3388 return 0;
3389 }
3390 runtime_visible_type_annotations_length = attribute_length;
3391 runtime_visible_type_annotations = cfs->current();
3392
3393 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3394 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3395 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3396
3397 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3398 if (runtime_invisible_type_annotations_exists) {
3399 classfile_parse_error(
3400 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3401 return 0;
3402 }
3403 runtime_invisible_type_annotations_exists = true;
3404 cfs->skip_u1(attribute_length, CHECK_0);
3405
3406 } else {
3407 // Skip unknown attributes
3408 cfs->skip_u1(attribute_length, CHECK_0);
3409 }
3410 calculate_attr_size += attribute_length;
3411 } // End of attributes For loop
3412
3413 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3414 runtime_visible_annotations_length,
3415 CHECK_0);
3416 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3417 runtime_visible_type_annotations_length,
3418 CHECK_0);
3419
3420 RecordComponent* record_component =
3421 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3422 annotations, type_annotations, CHECK_0);
3423 record_components->at_put(x, record_component);
3424 } // End of component processing loop
3425
3426 // Restore buffer's current position.
3427 cfs->set_current(current_mark);
3428 return calculate_attr_size;
3429 }
3430
3431 void ClassFileParser::parse_classfile_synthetic_attribute() {
3432 set_class_synthetic_flag(true);
3433 }
3434
3435 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3436 assert(cfs != nullptr, "invariant");
3437
3438 const u2 signature_index = cfs->get_u2(CHECK);
3439 guarantee_property(
3440 valid_symbol_at(signature_index),
3441 "Invalid constant pool index %u in Signature attribute in class file %s",
3442 signature_index, CHECK);
3443 set_class_generic_signature_index(signature_index);
3444 }
3445
3446 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3447 ConstantPool* cp,
3448 u4 attribute_byte_length,
3449 TRAPS) {
3450 assert(cfs != nullptr, "invariant");
3451 assert(cp != nullptr, "invariant");
3452
3453 const u1* const current_start = cfs->current();
3454
3455 guarantee_property(attribute_byte_length >= sizeof(u2),
3456 "Invalid BootstrapMethods attribute length %u in class file %s",
3457 attribute_byte_length,
3458 CHECK);
3459
3460 cfs->guarantee_more(attribute_byte_length, CHECK);
3461
3462 const int attribute_array_length = cfs->get_u2_fast();
3463
3464 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3465 "Short length on BootstrapMethods in class file %s",
3466 CHECK);
3467
3468
3469 // The attribute contains a counted array of counted tuples of shorts,
3470 // represending bootstrap specifiers:
3471 // length*{bootstrap_method_index, argument_count*{argument_index}}
3472 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3473 // operand_count = number of shorts in attr, except for leading length
3474
3475 // The attribute is copied into a short[] array.
3476 // The array begins with a series of short[2] pairs, one for each tuple.
3477 const int index_size = (attribute_array_length * 2);
3478
3479 Array<u2>* const operands =
3480 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3481
3482 // Eagerly assign operands so they will be deallocated with the constant
3483 // pool if there is an error.
3484 cp->set_operands(operands);
3485
3486 int operand_fill_index = index_size;
3487 const int cp_size = cp->length();
3488
3489 for (int n = 0; n < attribute_array_length; n++) {
3490 // Store a 32-bit offset into the header of the operand array.
3491 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3492
3493 // Read a bootstrap specifier.
3494 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3495 const u2 bootstrap_method_index = cfs->get_u2_fast();
3496 const u2 argument_count = cfs->get_u2_fast();
3497 guarantee_property(
3498 valid_cp_range(bootstrap_method_index, cp_size) &&
3499 cp->tag_at(bootstrap_method_index).is_method_handle(),
3500 "bootstrap_method_index %u has bad constant type in class file %s",
3501 bootstrap_method_index,
3502 CHECK);
3503
3504 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3505 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3506 CHECK);
3507
3508 operands->at_put(operand_fill_index++, bootstrap_method_index);
3509 operands->at_put(operand_fill_index++, argument_count);
3510
3511 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3512 for (int j = 0; j < argument_count; j++) {
3513 const u2 argument_index = cfs->get_u2_fast();
3514 guarantee_property(
3515 valid_cp_range(argument_index, cp_size) &&
3516 cp->tag_at(argument_index).is_loadable_constant(),
3517 "argument_index %u has bad constant type in class file %s",
3518 argument_index,
3519 CHECK);
3520 operands->at_put(operand_fill_index++, argument_index);
3521 }
3522 }
3523 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3524 "Bad length on BootstrapMethods in class file %s",
3525 CHECK);
3526 }
3527
3528 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3529 ConstantPool* cp,
3530 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3531 TRAPS) {
3532 assert(cfs != nullptr, "invariant");
3533 assert(cp != nullptr, "invariant");
3534 assert(parsed_annotations != nullptr, "invariant");
3535
3536 // Set inner classes attribute to default sentinel
3537 _inner_classes = Universe::the_empty_short_array();
3538 // Set nest members attribute to default sentinel
3539 _nest_members = Universe::the_empty_short_array();
3540 // Set _permitted_subclasses attribute to default sentinel
3541 _permitted_subclasses = Universe::the_empty_short_array();
3542 // Set _loadable_descriptors attribute to default sentinel
3543 _loadable_descriptors = Universe::the_empty_short_array();
3544 cfs->guarantee_more(2, CHECK); // attributes_count
3545 u2 attributes_count = cfs->get_u2_fast();
3546 bool parsed_sourcefile_attribute = false;
3547 bool parsed_innerclasses_attribute = false;
3548 bool parsed_nest_members_attribute = false;
3549 bool parsed_permitted_subclasses_attribute = false;
3550 bool parsed_loadable_descriptors_attribute = false;
3551 bool parsed_nest_host_attribute = false;
3552 bool parsed_record_attribute = false;
3553 bool parsed_enclosingmethod_attribute = false;
3554 bool parsed_bootstrap_methods_attribute = false;
3555 const u1* runtime_visible_annotations = nullptr;
3556 int runtime_visible_annotations_length = 0;
3557 const u1* runtime_visible_type_annotations = nullptr;
3558 int runtime_visible_type_annotations_length = 0;
3559 bool runtime_invisible_type_annotations_exists = false;
3560 bool runtime_invisible_annotations_exists = false;
3561 bool parsed_source_debug_ext_annotations_exist = false;
3562 const u1* inner_classes_attribute_start = nullptr;
3563 u4 inner_classes_attribute_length = 0;
3564 u2 enclosing_method_class_index = 0;
3565 u2 enclosing_method_method_index = 0;
3566 const u1* nest_members_attribute_start = nullptr;
3567 u4 nest_members_attribute_length = 0;
3568 const u1* record_attribute_start = nullptr;
3569 u4 record_attribute_length = 0;
3570 const u1* permitted_subclasses_attribute_start = nullptr;
3571 u4 permitted_subclasses_attribute_length = 0;
3572 const u1* loadable_descriptors_attribute_start = nullptr;
3573 u4 loadable_descriptors_attribute_length = 0;
3574
3575 // Iterate over attributes
3576 while (attributes_count--) {
3577 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3578 const u2 attribute_name_index = cfs->get_u2_fast();
3579 const u4 attribute_length = cfs->get_u4_fast();
3580 guarantee_property(
3581 valid_symbol_at(attribute_name_index),
3582 "Attribute name has bad constant pool index %u in class file %s",
3583 attribute_name_index, CHECK);
3584 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3585 if (tag == vmSymbols::tag_source_file()) {
3586 // Check for SourceFile tag
3587 if (_need_verify) {
3588 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3589 }
3590 if (parsed_sourcefile_attribute) {
3591 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3592 return;
3593 } else {
3594 parsed_sourcefile_attribute = true;
3595 }
3596 parse_classfile_sourcefile_attribute(cfs, CHECK);
3597 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3598 // Check for SourceDebugExtension tag
3599 if (parsed_source_debug_ext_annotations_exist) {
3600 classfile_parse_error(
3601 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3602 return;
3603 }
3604 parsed_source_debug_ext_annotations_exist = true;
3605 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3606 } else if (tag == vmSymbols::tag_inner_classes()) {
3607 // Check for InnerClasses tag
3608 if (parsed_innerclasses_attribute) {
3609 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3610 return;
3611 } else {
3612 parsed_innerclasses_attribute = true;
3613 }
3614 inner_classes_attribute_start = cfs->current();
3615 inner_classes_attribute_length = attribute_length;
3616 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3617 } else if (tag == vmSymbols::tag_synthetic()) {
3618 // Check for Synthetic tag
3619 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3620 if (attribute_length != 0) {
3621 classfile_parse_error(
3622 "Invalid Synthetic classfile attribute length %u in class file %s",
3623 attribute_length, THREAD);
3624 return;
3625 }
3626 parse_classfile_synthetic_attribute();
3627 } else if (tag == vmSymbols::tag_deprecated()) {
3628 // Check for Deprecated tag - 4276120
3629 if (attribute_length != 0) {
3630 classfile_parse_error(
3631 "Invalid Deprecated classfile attribute length %u in class file %s",
3632 attribute_length, THREAD);
3633 return;
3634 }
3635 } else if (_major_version >= JAVA_1_5_VERSION) {
3636 if (tag == vmSymbols::tag_signature()) {
3637 if (_generic_signature_index != 0) {
3638 classfile_parse_error(
3639 "Multiple Signature attributes in class file %s", THREAD);
3640 return;
3641 }
3642 if (attribute_length != 2) {
3643 classfile_parse_error(
3644 "Wrong Signature attribute length %u in class file %s",
3645 attribute_length, THREAD);
3646 return;
3647 }
3648 parse_classfile_signature_attribute(cfs, CHECK);
3649 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3650 if (runtime_visible_annotations != nullptr) {
3651 classfile_parse_error(
3652 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3653 return;
3654 }
3655 runtime_visible_annotations_length = attribute_length;
3656 runtime_visible_annotations = cfs->current();
3657 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3658 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3659 parse_annotations(cp,
3660 runtime_visible_annotations,
3661 runtime_visible_annotations_length,
3662 parsed_annotations,
3663 _loader_data,
3664 _can_access_vm_annotations);
3665 cfs->skip_u1_fast(runtime_visible_annotations_length);
3666 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3667 if (runtime_invisible_annotations_exists) {
3668 classfile_parse_error(
3669 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3670 return;
3671 }
3672 runtime_invisible_annotations_exists = true;
3673 cfs->skip_u1(attribute_length, CHECK);
3674 } else if (tag == vmSymbols::tag_enclosing_method()) {
3675 if (parsed_enclosingmethod_attribute) {
3676 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3677 return;
3678 } else {
3679 parsed_enclosingmethod_attribute = true;
3680 }
3681 guarantee_property(attribute_length == 4,
3682 "Wrong EnclosingMethod attribute length %u in class file %s",
3683 attribute_length, CHECK);
3684 cfs->guarantee_more(4, CHECK); // class_index, method_index
3685 enclosing_method_class_index = cfs->get_u2_fast();
3686 enclosing_method_method_index = cfs->get_u2_fast();
3687 if (enclosing_method_class_index == 0) {
3688 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3689 return;
3690 }
3691 // Validate the constant pool indices and types
3692 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3693 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3694 if (enclosing_method_method_index != 0 &&
3695 (!cp->is_within_bounds(enclosing_method_method_index) ||
3696 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3697 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3698 return;
3699 }
3700 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3701 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3702 if (parsed_bootstrap_methods_attribute) {
3703 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3704 return;
3705 }
3706 parsed_bootstrap_methods_attribute = true;
3707 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3708 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3709 if (runtime_visible_type_annotations != nullptr) {
3710 classfile_parse_error(
3711 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3712 return;
3713 }
3714 runtime_visible_type_annotations_length = attribute_length;
3715 runtime_visible_type_annotations = cfs->current();
3716 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3717 // No need for the VM to parse Type annotations
3718 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3719 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3720 if (runtime_invisible_type_annotations_exists) {
3721 classfile_parse_error(
3722 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3723 return;
3724 }
3725 runtime_invisible_type_annotations_exists = true;
3726 cfs->skip_u1(attribute_length, CHECK);
3727 } else if (_major_version >= JAVA_11_VERSION) {
3728 if (tag == vmSymbols::tag_nest_members()) {
3729 // Check for NestMembers tag
3730 if (parsed_nest_members_attribute) {
3731 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3732 return;
3733 } else {
3734 parsed_nest_members_attribute = true;
3735 }
3736 if (parsed_nest_host_attribute) {
3737 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3738 return;
3739 }
3740 nest_members_attribute_start = cfs->current();
3741 nest_members_attribute_length = attribute_length;
3742 cfs->skip_u1(nest_members_attribute_length, CHECK);
3743 } else if (tag == vmSymbols::tag_nest_host()) {
3744 if (parsed_nest_host_attribute) {
3745 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3746 return;
3747 } else {
3748 parsed_nest_host_attribute = true;
3749 }
3750 if (parsed_nest_members_attribute) {
3751 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3752 return;
3753 }
3754 if (_need_verify) {
3755 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3756 }
3757 cfs->guarantee_more(2, CHECK);
3758 u2 class_info_index = cfs->get_u2_fast();
3759 guarantee_property(
3760 valid_klass_reference_at(class_info_index),
3761 "Nest-host class_info_index %u has bad constant type in class file %s",
3762 class_info_index, CHECK);
3763 _nest_host = class_info_index;
3764
3765 } else if (_major_version >= JAVA_16_VERSION) {
3766 if (tag == vmSymbols::tag_record()) {
3767 if (parsed_record_attribute) {
3768 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3769 return;
3770 }
3771 parsed_record_attribute = true;
3772 record_attribute_start = cfs->current();
3773 record_attribute_length = attribute_length;
3774 } else if (_major_version >= JAVA_17_VERSION) {
3775 if (tag == vmSymbols::tag_permitted_subclasses()) {
3776 if (parsed_permitted_subclasses_attribute) {
3777 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3778 return;
3779 }
3780 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3781 if (_access_flags.is_final()) {
3782 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3783 return;
3784 }
3785 parsed_permitted_subclasses_attribute = true;
3786 permitted_subclasses_attribute_start = cfs->current();
3787 permitted_subclasses_attribute_length = attribute_length;
3788 }
3789 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3790 if (parsed_loadable_descriptors_attribute) {
3791 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3792 return;
3793 }
3794 parsed_loadable_descriptors_attribute = true;
3795 loadable_descriptors_attribute_start = cfs->current();
3796 loadable_descriptors_attribute_length = attribute_length;
3797 }
3798 }
3799 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3800 cfs->skip_u1(attribute_length, CHECK);
3801 } else {
3802 // Unknown attribute
3803 cfs->skip_u1(attribute_length, CHECK);
3804 }
3805 } else {
3806 // Unknown attribute
3807 cfs->skip_u1(attribute_length, CHECK);
3808 }
3809 } else {
3810 // Unknown attribute
3811 cfs->skip_u1(attribute_length, CHECK);
3812 }
3813 }
3814 _class_annotations = allocate_annotations(runtime_visible_annotations,
3815 runtime_visible_annotations_length,
3816 CHECK);
3817 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3818 runtime_visible_type_annotations_length,
3819 CHECK);
3820
3821 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3822 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3823 cfs,
3824 cp,
3825 inner_classes_attribute_start,
3826 parsed_innerclasses_attribute,
3827 enclosing_method_class_index,
3828 enclosing_method_method_index,
3829 CHECK);
3830 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3831 guarantee_property(
3832 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3833 "Wrong InnerClasses attribute length in class file %s", CHECK);
3834 }
3835 }
3836
3837 if (parsed_nest_members_attribute) {
3838 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3839 cfs,
3840 nest_members_attribute_start,
3841 CHECK);
3842 if (_need_verify) {
3843 guarantee_property(
3844 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3845 "Wrong NestMembers attribute length in class file %s", CHECK);
3846 }
3847 }
3848
3849 if (parsed_record_attribute) {
3850 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3851 cfs,
3852 cp,
3853 record_attribute_start,
3854 CHECK);
3855 if (_need_verify) {
3856 guarantee_property(record_attribute_length == calculated_attr_length,
3857 "Record attribute has wrong length in class file %s",
3858 CHECK);
3859 }
3860 }
3861
3862 if (parsed_permitted_subclasses_attribute) {
3863 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3864 cfs,
3865 permitted_subclasses_attribute_start,
3866 CHECK);
3867 if (_need_verify) {
3868 guarantee_property(
3869 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3870 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3871 }
3872 }
3873
3874 if (parsed_loadable_descriptors_attribute) {
3875 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3876 cfs,
3877 loadable_descriptors_attribute_start,
3878 CHECK);
3879 if (_need_verify) {
3880 guarantee_property(
3881 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3882 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3883 }
3884 }
3885
3886 if (_max_bootstrap_specifier_index >= 0) {
3887 guarantee_property(parsed_bootstrap_methods_attribute,
3888 "Missing BootstrapMethods attribute in class file %s", CHECK);
3889 }
3890 }
3891
3892 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3893 assert(k != nullptr, "invariant");
3894
3895 if (_synthetic_flag)
3896 k->set_is_synthetic();
3897 if (_sourcefile_index != 0) {
3898 k->set_source_file_name_index(_sourcefile_index);
3899 }
3900 if (_generic_signature_index != 0) {
3901 k->set_generic_signature_index(_generic_signature_index);
3902 }
3903 if (_sde_buffer != nullptr) {
3904 k->set_source_debug_extension(_sde_buffer, _sde_length);
3905 }
3906 }
3907
3908 // Create the Annotations object that will
3909 // hold the annotations array for the Klass.
3910 void ClassFileParser::create_combined_annotations(TRAPS) {
3911 if (_class_annotations == nullptr &&
3912 _class_type_annotations == nullptr &&
3913 _fields_annotations == nullptr &&
3914 _fields_type_annotations == nullptr) {
3915 // Don't create the Annotations object unnecessarily.
3916 return;
3917 }
3918
3919 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3920 annotations->set_class_annotations(_class_annotations);
3921 annotations->set_class_type_annotations(_class_type_annotations);
3922 annotations->set_fields_annotations(_fields_annotations);
3923 annotations->set_fields_type_annotations(_fields_type_annotations);
3924
3925 // This is the Annotations object that will be
3926 // assigned to InstanceKlass being constructed.
3927 _combined_annotations = annotations;
3928
3929 // The annotations arrays below has been transferred the
3930 // _combined_annotations so these fields can now be cleared.
3931 _class_annotations = nullptr;
3932 _class_type_annotations = nullptr;
3933 _fields_annotations = nullptr;
3934 _fields_type_annotations = nullptr;
3935 }
3936
3937 // Transfer ownership of metadata allocated to the InstanceKlass.
3938 void ClassFileParser::apply_parsed_class_metadata(
3939 InstanceKlass* this_klass,
3940 int java_fields_count) {
3941 assert(this_klass != nullptr, "invariant");
3942
3943 _cp->set_pool_holder(this_klass);
3944 this_klass->set_constants(_cp);
3945 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3946 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3947 this_klass->set_fields_status(_fields_status);
3948 this_klass->set_methods(_methods);
3949 this_klass->set_inner_classes(_inner_classes);
3950 this_klass->set_nest_members(_nest_members);
3951 this_klass->set_nest_host_index(_nest_host);
3952 this_klass->set_loadable_descriptors(_loadable_descriptors);
3953 this_klass->set_annotations(_combined_annotations);
3954 this_klass->set_permitted_subclasses(_permitted_subclasses);
3955 this_klass->set_record_components(_record_components);
3956 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3957
3958 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3959
3960 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3961 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3962 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3963 // its _super. If an OOM occurs while loading the current klass, its _super field
3964 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3965 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3966 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3967
3968 // Clear out these fields so they don't get deallocated by the destructor
3969 clear_class_metadata();
3970 }
3971
3972 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3973 int anno_length,
3974 TRAPS) {
3975 AnnotationArray* annotations = nullptr;
3976 if (anno != nullptr) {
3977 annotations = MetadataFactory::new_array<u1>(_loader_data,
3978 anno_length,
3979 CHECK_(annotations));
3980 for (int i = 0; i < anno_length; i++) {
3981 annotations->at_put(i, anno[i]);
3982 }
3983 }
3984 return annotations;
3985 }
3986
3987 void ClassFileParser::check_super_class(ConstantPool* const cp,
3988 const int super_class_index,
3989 const bool need_verify,
3990 TRAPS) {
3991 assert(cp != nullptr, "invariant");
3992
3993 if (super_class_index == 0) {
3994 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3995 "Invalid superclass index 0 in class file %s",
3996 CHECK);
3997 } else {
3998 guarantee_property(valid_klass_reference_at(super_class_index),
3999 "Invalid superclass index %u in class file %s",
4000 super_class_index,
4001 CHECK);
4002
4003 // The class name should be legal because it is checked when parsing constant pool.
4004 // However, make sure it is not an array type.
4005 if (need_verify) {
4006 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4007 "Bad superclass name in class file %s", CHECK);
4008 }
4009 }
4010 }
4011
4012 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4013 _max_nonstatic_oop_maps = max_blocks;
4014 _nonstatic_oop_map_count = 0;
4015 if (max_blocks == 0) {
4016 _nonstatic_oop_maps = nullptr;
4017 } else {
4018 _nonstatic_oop_maps =
4019 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4020 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4021 }
4022 }
4023
4024 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4025 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4026 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4027 }
4028
4029 // addition of super oop maps
4030 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4031 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4032 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4033
4034 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4035 _nonstatic_oop_map_count += nof_blocks;
4036 }
4037
4038 // collection of oops
4039 void OopMapBlocksBuilder::add(int offset, int count) {
4040 if (_nonstatic_oop_map_count == 0) {
4041 _nonstatic_oop_map_count++;
4042 }
4043 OopMapBlock* nonstatic_oop_map = last_oop_map();
4044 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4045 nonstatic_oop_map->set_offset(offset);
4046 nonstatic_oop_map->set_count(count);
4047 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4048 nonstatic_oop_map->increment_count(count);
4049 } else { // Need a new one...
4050 _nonstatic_oop_map_count++;
4051 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4052 nonstatic_oop_map = last_oop_map();
4053 nonstatic_oop_map->set_offset(offset);
4054 nonstatic_oop_map->set_count(count);
4055 }
4056 }
4057
4058 // general purpose copy, e.g. into allocated instanceKlass
4059 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4060 if (_nonstatic_oop_map_count != 0) {
4061 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4062 }
4063 }
4064
4065 // Sort and compact adjacent blocks
4066 void OopMapBlocksBuilder::compact() {
4067 if (_nonstatic_oop_map_count <= 1) {
4068 return;
4069 }
4070 /*
4071 * Since field layout sneaks in oops before values, we will be able to condense
4072 * blocks. There is potential to compact between super, own refs and values
4073 * containing refs.
4074 *
4075 * Currently compaction is slightly limited due to values being 8 byte aligned.
4076 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4077 * and maybe it doesn't need to be.
4078 */
4079 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4080 (_sort_Fn)OopMapBlock::compare_offset);
4081 if (_nonstatic_oop_map_count < 2) {
4082 return;
4083 }
4084
4085 // Make a temp copy, and iterate through and copy back into the original
4086 ResourceMark rm;
4087 OopMapBlock* oop_maps_copy =
4088 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4089 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4090 copy(oop_maps_copy);
4091 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4092 unsigned int new_count = 1;
4093 oop_maps_copy++;
4094 while(oop_maps_copy < oop_maps_copy_end) {
4095 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4096 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4097 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4098 } else {
4099 nonstatic_oop_map++;
4100 new_count++;
4101 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4102 nonstatic_oop_map->set_count(oop_maps_copy->count());
4103 }
4104 oop_maps_copy++;
4105 }
4106 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4107 _nonstatic_oop_map_count = new_count;
4108 }
4109
4110 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4111 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4112 if (_nonstatic_oop_map_count > 0) {
4113 OopMapBlock* map = _nonstatic_oop_maps;
4114 OopMapBlock* last_map = last_oop_map();
4115 assert(map <= last_map, "Last less than first");
4116 while (map <= last_map) {
4117 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4118 map->offset() + map->offset_span() - heapOopSize, map->count());
4119 map++;
4120 }
4121 }
4122 }
4123
4124 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4125 print_on(st);
4126 }
4127
4128 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4129 assert(ik != nullptr, "invariant");
4130
4131 const InstanceKlass* const super = ik->super();
4132
4133 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4134 // in which case we don't have to register objects as finalizable
4135 if (!_has_empty_finalizer) {
4136 if (_has_finalizer ||
4137 (super != nullptr && super->has_finalizer())) {
4138 ik->set_has_finalizer();
4139 }
4140 }
4141
4142 #ifdef ASSERT
4143 bool f = false;
4144 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4145 vmSymbols::void_method_signature());
4146 if (InstanceKlass::is_finalization_enabled() &&
4147 (m != nullptr) && !m->is_empty_method()) {
4148 f = true;
4149 }
4150
4151 // Spec doesn't prevent agent from redefinition of empty finalizer.
4152 // Despite the fact that it's generally bad idea and redefined finalizer
4153 // will not work as expected we shouldn't abort vm in this case
4154 if (!ik->has_redefined_this_or_super()) {
4155 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4156 }
4157 #endif
4158
4159 // Check if this klass supports the java.lang.Cloneable interface
4160 if (vmClasses::Cloneable_klass_is_loaded()) {
4161 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4162 ik->set_is_cloneable();
4163 }
4164 }
4165
4166 // If it cannot be fast-path allocated, set a bit in the layout helper.
4167 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4168 assert(ik->size_helper() > 0, "layout_helper is initialized");
4169 if (ik->is_abstract() || ik->is_interface()
4170 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4171 || ik->size_helper() >= FastAllocateSizeLimit) {
4172 // Forbid fast-path allocation.
4173 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4174 ik->set_layout_helper(lh);
4175 }
4176
4177 // Propagate the AOT runtimeSetup method discovery
4178 if (_has_aot_runtime_setup_method) {
4179 ik->set_is_runtime_setup_required();
4180 if (log_is_enabled(Info, aot, init)) {
4181 ResourceMark rm;
4182 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4183 }
4184 }
4185 }
4186
4187 bool ClassFileParser::supports_inline_types() const {
4188 // Inline types are only supported by class file version 70.65535 and later
4189 return _major_version > JAVA_26_VERSION ||
4190 (_major_version == JAVA_26_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4191 }
4192
4193 // utility methods for appending an array with check for duplicates
4194
4195 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4196 const Array<InstanceKlass*>* const ifs) {
4197 // iterate over new interfaces
4198 for (int i = 0; i < ifs->length(); i++) {
4199 InstanceKlass* const e = ifs->at(i);
4200 assert(e->is_klass() && e->is_interface(), "just checking");
4201 // add new interface
4202 result->append_if_missing(e);
4203 }
4204 }
4205
4206 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4207 Array<InstanceKlass*>* local_ifs,
4208 ClassLoaderData* loader_data,
4209 TRAPS) {
4210 assert(local_ifs != nullptr, "invariant");
4211 assert(loader_data != nullptr, "invariant");
4212
4213 // Compute maximum size for transitive interfaces
4214 int max_transitive_size = 0;
4215 int super_size = 0;
4216 // Add superclass transitive interfaces size
4217 if (super != nullptr) {
4218 super_size = super->transitive_interfaces()->length();
4219 max_transitive_size += super_size;
4220 }
4221 // Add local interfaces' super interfaces
4222 const int local_size = local_ifs->length();
4223 for (int i = 0; i < local_size; i++) {
4224 InstanceKlass* const l = local_ifs->at(i);
4225 max_transitive_size += l->transitive_interfaces()->length();
4226 }
4227 // Finally add local interfaces
4228 max_transitive_size += local_size;
4229 // Construct array
4230 if (max_transitive_size == 0) {
4231 // no interfaces, use canonicalized array
4232 return Universe::the_empty_instance_klass_array();
4233 } else if (max_transitive_size == super_size) {
4234 // no new local interfaces added, share superklass' transitive interface array
4235 return super->transitive_interfaces();
4236 // The three lines below are commented to work around bug JDK-8245487
4237 // } else if (max_transitive_size == local_size) {
4238 // // only local interfaces added, share local interface array
4239 // return local_ifs;
4240 } else {
4241 ResourceMark rm;
4242 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4243
4244 // Copy down from superclass
4245 if (super != nullptr) {
4246 append_interfaces(result, super->transitive_interfaces());
4247 }
4248
4249 // Copy down from local interfaces' superinterfaces
4250 for (int i = 0; i < local_size; i++) {
4251 InstanceKlass* const l = local_ifs->at(i);
4252 append_interfaces(result, l->transitive_interfaces());
4253 }
4254 // Finally add local interfaces
4255 append_interfaces(result, local_ifs);
4256
4257 // length will be less than the max_transitive_size if duplicates were removed
4258 const int length = result->length();
4259 assert(length <= max_transitive_size, "just checking");
4260
4261 Array<InstanceKlass*>* const new_result =
4262 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4263 for (int i = 0; i < length; i++) {
4264 InstanceKlass* const e = result->at(i);
4265 assert(e != nullptr, "just checking");
4266 new_result->at_put(i, e);
4267 }
4268 return new_result;
4269 }
4270 }
4271
4272 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4273 assert(this_klass != nullptr, "invariant");
4274 const InstanceKlass* const super = this_klass->super();
4275
4276 if (super != nullptr) {
4277 if (super->is_final()) {
4278 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4279 return;
4280 }
4281
4282 if (super->is_sealed()) {
4283 stringStream ss;
4284 ResourceMark rm(THREAD);
4285 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4286 classfile_icce_error(ss.as_string(), THREAD);
4287 return;
4288 }
4289 }
4290
4291 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4292 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4293 // for a value classes. So, it is treated as a special case for now.
4294 if (!this_klass->access_flags().is_identity_class() &&
4295 super->name() != vmSymbols::java_lang_Object() &&
4296 super->is_identity_class()) {
4297 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4298 return;
4299 }
4300
4301 Reflection::VerifyClassAccessResults vca_result =
4302 Reflection::verify_class_access(this_klass, super, false);
4303 if (vca_result != Reflection::ACCESS_OK) {
4304 ResourceMark rm(THREAD);
4305 char* msg = Reflection::verify_class_access_msg(this_klass,
4306 super,
4307 vca_result);
4308
4309 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4310 if (msg == nullptr) {
4311 bool same_module = (this_klass->module() == super->module());
4312 Exceptions::fthrow(
4313 THREAD_AND_LOCATION,
4314 vmSymbols::java_lang_IllegalAccessError(),
4315 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4316 this_klass->external_name(),
4317 super->is_abstract() ? "abstract " : "",
4318 super->external_name(),
4319 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4320 (same_module) ? "" : "; ",
4321 (same_module) ? "" : super->class_in_module_of_loader());
4322 } else {
4323 // Add additional message content.
4324 Exceptions::fthrow(
4325 THREAD_AND_LOCATION,
4326 vmSymbols::java_lang_IllegalAccessError(),
4327 "superclass access check failed: %s",
4328 msg);
4329 }
4330 }
4331 }
4332 }
4333
4334
4335 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4336 assert(this_klass != nullptr, "invariant");
4337 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4338 const int lng = local_interfaces->length();
4339 for (int i = lng - 1; i >= 0; i--) {
4340 InstanceKlass* const k = local_interfaces->at(i);
4341 assert (k != nullptr && k->is_interface(), "invalid interface");
4342
4343 if (k->is_sealed()) {
4344 stringStream ss;
4345 ResourceMark rm(THREAD);
4346 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4347 classfile_icce_error(ss.as_string(), THREAD);
4348 return;
4349 }
4350 }
4351
4352 Reflection::VerifyClassAccessResults vca_result =
4353 Reflection::verify_class_access(this_klass, k, false);
4354 if (vca_result != Reflection::ACCESS_OK) {
4355 ResourceMark rm(THREAD);
4356 char* msg = Reflection::verify_class_access_msg(this_klass,
4357 k,
4358 vca_result);
4359
4360 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4361 if (msg == nullptr) {
4362 bool same_module = (this_klass->module() == k->module());
4363 Exceptions::fthrow(
4364 THREAD_AND_LOCATION,
4365 vmSymbols::java_lang_IllegalAccessError(),
4366 "class %s cannot access its superinterface %s (%s%s%s)",
4367 this_klass->external_name(),
4368 k->external_name(),
4369 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4370 (same_module) ? "" : "; ",
4371 (same_module) ? "" : k->class_in_module_of_loader());
4372 return;
4373 } else {
4374 // Add additional message content.
4375 Exceptions::fthrow(
4376 THREAD_AND_LOCATION,
4377 vmSymbols::java_lang_IllegalAccessError(),
4378 "superinterface check failed: %s",
4379 msg);
4380 return;
4381 }
4382 }
4383 }
4384 }
4385
4386
4387 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4388 assert(this_klass != nullptr, "invariant");
4389 const Array<Method*>* const methods = this_klass->methods();
4390 const int num_methods = methods->length();
4391
4392 // go thru each method and check if it overrides a final method
4393 for (int index = 0; index < num_methods; index++) {
4394 const Method* const m = methods->at(index);
4395
4396 // skip private, static, and <init> methods
4397 if ((!m->is_private() && !m->is_static()) &&
4398 (m->name() != vmSymbols::object_initializer_name())) {
4399
4400 const Symbol* const name = m->name();
4401 const Symbol* const signature = m->signature();
4402 const InstanceKlass* k = this_klass->super();
4403 const Method* super_m = nullptr;
4404 while (k != nullptr) {
4405 // skip supers that don't have final methods.
4406 if (k->has_final_method()) {
4407 // lookup a matching method in the super class hierarchy
4408 super_m = k->lookup_method(name, signature);
4409 if (super_m == nullptr) {
4410 break; // didn't find any match; get out
4411 }
4412
4413 if (super_m->is_final() && !super_m->is_static() &&
4414 !super_m->access_flags().is_private()) {
4415 // matching method in super is final, and not static or private
4416 bool can_access = Reflection::verify_member_access(this_klass,
4417 super_m->method_holder(),
4418 super_m->method_holder(),
4419 super_m->access_flags(),
4420 false, false, CHECK);
4421 if (can_access) {
4422 // this class can access super final method and therefore override
4423 ResourceMark rm(THREAD);
4424 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4425 err_msg("class %s overrides final method %s.%s%s",
4426 this_klass->external_name(),
4427 super_m->method_holder()->external_name(),
4428 name->as_C_string(),
4429 signature->as_C_string()));
4430 }
4431 }
4432
4433 // continue to look from super_m's holder's super.
4434 k = super_m->method_holder()->super();
4435 continue;
4436 }
4437
4438 k = k->super();
4439 }
4440 }
4441 }
4442 }
4443
4444
4445 // assumes that this_klass is an interface
4446 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4447 assert(this_klass != nullptr, "invariant");
4448 assert(this_klass->is_interface(), "not an interface");
4449 const Array<Method*>* methods = this_klass->methods();
4450 const int num_methods = methods->length();
4451
4452 for (int index = 0; index < num_methods; index++) {
4453 const Method* const m = methods->at(index);
4454 // if m is static and not the init method, throw a verify error
4455 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4456 ResourceMark rm(THREAD);
4457
4458 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4459 Exceptions::fthrow(
4460 THREAD_AND_LOCATION,
4461 vmSymbols::java_lang_VerifyError(),
4462 "Illegal static method %s in interface %s",
4463 m->name()->as_C_string(),
4464 this_klass->external_name()
4465 );
4466 return;
4467 }
4468 }
4469 }
4470
4471 // utility methods for format checking
4472
4473 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4474 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4475 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4476 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4477 if (is_module) {
4478 ResourceMark rm(THREAD);
4479 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4480 Exceptions::fthrow(
4481 THREAD_AND_LOCATION,
4482 vmSymbols::java_lang_NoClassDefFoundError(),
4483 "%s is not a class because access_flag ACC_MODULE is set",
4484 _class_name->as_C_string());
4485 return;
4486 }
4487
4488 if (!_need_verify) { return; }
4489
4490 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4491 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4492 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4493 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4494 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4495 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4496 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4497 const bool valid_value_class = is_identity || is_interface ||
4498 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4499
4500 if ((is_abstract && is_final) ||
4501 (is_interface && !is_abstract) ||
4502 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4503 (!is_interface && major_gte_1_5 && is_annotation) ||
4504 (!valid_value_class)) {
4505 ResourceMark rm(THREAD);
4506 const char* class_note = "";
4507 if (!valid_value_class) {
4508 class_note = " (a value class must be final or else abstract)";
4509 }
4510 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4511 if (inner_name == nullptr && !is_anonymous_inner_class) {
4512 Exceptions::fthrow(
4513 THREAD_AND_LOCATION,
4514 vmSymbols::java_lang_ClassFormatError(),
4515 "Illegal class modifiers in class %s: 0x%X",
4516 _class_name->as_C_string(), flags
4517 );
4518 } else {
4519 if (is_anonymous_inner_class) {
4520 Exceptions::fthrow(
4521 THREAD_AND_LOCATION,
4522 vmSymbols::java_lang_ClassFormatError(),
4523 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4524 _class_name->as_C_string(), flags
4525 );
4526 } else {
4527 Exceptions::fthrow(
4528 THREAD_AND_LOCATION,
4529 vmSymbols::java_lang_ClassFormatError(),
4530 "Illegal class modifiers in inner class %s of class %s: 0x%X",
4531 inner_name->as_C_string(), _class_name->as_C_string(), flags
4532 );
4533 }
4534 }
4535 return;
4536 }
4537 }
4538
4539 static bool has_illegal_visibility(jint flags) {
4540 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4541 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4542 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4543
4544 return ((is_public && is_protected) ||
4545 (is_public && is_private) ||
4546 (is_protected && is_private));
4547 }
4548
4549 // A legal major_version.minor_version must be one of the following:
4550 //
4551 // Major_version >= 45 and major_version < 56, any minor_version.
4552 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4553 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4554 //
4555 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4556 ResourceMark rm(THREAD);
4557 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4558 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4559 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4560 class_name, major, minor, THREAD);
4561 return;
4562 }
4563
4564 if (major > max_version) {
4565 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4566 Exceptions::fthrow(
4567 THREAD_AND_LOCATION,
4568 vmSymbols::java_lang_UnsupportedClassVersionError(),
4569 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4570 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4571 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4572 return;
4573 }
4574
4575 if (major < JAVA_12_VERSION || minor == 0) {
4576 return;
4577 }
4578
4579 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4580 if (major != max_version) {
4581 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4582 Exceptions::fthrow(
4583 THREAD_AND_LOCATION,
4584 vmSymbols::java_lang_UnsupportedClassVersionError(),
4585 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4586 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4587 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4588 return;
4589 }
4590
4591 if (!Arguments::enable_preview()) {
4592 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4593 class_name, major, minor, THREAD);
4594 return;
4595 }
4596
4597 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4598 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4599 class_name, major, minor, THREAD);
4600 }
4601 }
4602
4603 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4604 AccessFlags class_access_flags,
4605 TRAPS) const {
4606 if (!_need_verify) { return; }
4607
4608 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4609 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4610 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4611 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4612 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4613 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4614 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4615 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4616 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4617 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4618
4619 const bool is_interface = class_access_flags.is_interface();
4620 const bool is_identity_class = class_access_flags.is_identity_class();
4621
4622 bool is_illegal = false;
4623 const char* error_msg = "";
4624
4625 // There is some overlap in the checks that apply, for example interface fields
4626 // must be static, static fields can't be strict, and therefore interfaces can't
4627 // have strict fields. So we don't have to check every possible invalid combination
4628 // individually as long as all are covered. Once we have found an illegal combination
4629 // we can stop checking.
4630
4631 if (!is_illegal) {
4632 if (is_interface) {
4633 if (!is_public || !is_static || !is_final || is_private ||
4634 is_protected || is_volatile || is_transient ||
4635 (major_gte_1_5 && is_enum)) {
4636 is_illegal = true;
4637 error_msg = "interface fields must be public, static and final, and may be synthetic";
4638 }
4639 } else { // not interface
4640 if (has_illegal_visibility(flags)) {
4641 is_illegal = true;
4642 error_msg = "invalid visibility flags for class field";
4643 } else if (is_final && is_volatile) {
4644 is_illegal = true;
4645 error_msg = "fields cannot be final and volatile";
4646 } else if (supports_inline_types()) {
4647 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4648 is_illegal = true;
4649 error_msg = "value class fields must be either non-static final and strict, or static";
4650 }
4651 }
4652 }
4653 }
4654
4655 if (is_illegal) {
4656 ResourceMark rm(THREAD);
4657 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4658 Exceptions::fthrow(
4659 THREAD_AND_LOCATION,
4660 vmSymbols::java_lang_ClassFormatError(),
4661 "Illegal field modifiers (%s) in class %s: 0x%X",
4662 error_msg, _class_name->as_C_string(), flags);
4663 return;
4664 }
4665 }
4666
4667 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4668 AccessFlags class_access_flags,
4669 const Symbol* name,
4670 TRAPS) const {
4671 if (!_need_verify) { return; }
4672
4673 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4674 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4675 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4676 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4677 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4678 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4679 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4680 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4681 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4682 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4683 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4684 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4685 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4686 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4687 // LW401 CR required: removal of value factories support
4688 const bool is_interface = class_access_flags.is_interface();
4689 const bool is_identity_class = class_access_flags.is_identity_class();
4690 const bool is_abstract_class = class_access_flags.is_abstract();
4691
4692 bool is_illegal = false;
4693
4694 const char* class_note = "";
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(),
4757 class_note, flags);
4758 return;
4759 }
4760 }
4761
4762 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4763 int length,
4764 TRAPS) const {
4765 assert(_need_verify, "only called when _need_verify is true");
4766 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4767 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4768 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4769 }
4770 }
4771
4772 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4773 // In class names, '/' separates unqualified names. This is verified in this function also.
4774 // Method names also may not contain the characters '<' or '>', unless <init>
4775 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4776 // method. Because these names have been checked as special cases before
4777 // calling this method in verify_legal_method_name.
4778 //
4779 // This method is also called from the modular system APIs in modules.cpp
4780 // to verify the validity of module and package names.
4781 bool ClassFileParser::verify_unqualified_name(const char* name,
4782 unsigned int length,
4783 int type) {
4784 if (length == 0) return false; // Must have at least one char.
4785 for (const char* p = name; p != name + length; p++) {
4786 switch(*p) {
4787 case JVM_SIGNATURE_DOT:
4788 case JVM_SIGNATURE_ENDCLASS:
4789 case JVM_SIGNATURE_ARRAY:
4790 // do not permit '.', ';', or '['
4791 return false;
4792 case JVM_SIGNATURE_SLASH:
4793 // check for '//' or leading or trailing '/' which are not legal
4794 // unqualified name must not be empty
4795 if (type == ClassFileParser::LegalClass) {
4796 if (p == name || p+1 >= name+length ||
4797 *(p+1) == JVM_SIGNATURE_SLASH) {
4798 return false;
4799 }
4800 } else {
4801 return false; // do not permit '/' unless it's class name
4802 }
4803 break;
4804 case JVM_SIGNATURE_SPECIAL:
4805 case JVM_SIGNATURE_ENDSPECIAL:
4806 // do not permit '<' or '>' in method names
4807 if (type == ClassFileParser::LegalMethod) {
4808 return false;
4809 }
4810 }
4811 }
4812 return true;
4813 }
4814
4815 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4816 if (_loadable_descriptors == nullptr) return false;
4817 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4818 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4819 if (class_name == klass) return true;
4820 }
4821 return false;
4822 }
4823
4824 // Take pointer to a UTF8 byte string (not NUL-terminated).
4825 // Skip over the longest part of the string that could
4826 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4827 // Return a pointer to just past the fieldname.
4828 // Return null if no fieldname at all was found, or in the case of slash_ok
4829 // being true, we saw consecutive slashes (meaning we were looking for a
4830 // qualified path but found something that was badly-formed).
4831 static const char* skip_over_field_name(const char* const name,
4832 bool slash_ok,
4833 unsigned int length) {
4834 const char* p;
4835 jboolean last_is_slash = false;
4836 jboolean not_first_ch = false;
4837
4838 for (p = name; p != name + length; not_first_ch = true) {
4839 const char* old_p = p;
4840 jchar ch = *p;
4841 if (ch < 128) {
4842 p++;
4843 // quick check for ascii
4844 if ((ch >= 'a' && ch <= 'z') ||
4845 (ch >= 'A' && ch <= 'Z') ||
4846 (ch == '_' || ch == '$') ||
4847 (not_first_ch && ch >= '0' && ch <= '9')) {
4848 last_is_slash = false;
4849 continue;
4850 }
4851 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4852 if (last_is_slash) {
4853 return nullptr; // Don't permit consecutive slashes
4854 }
4855 last_is_slash = true;
4856 continue;
4857 }
4858 }
4859 else {
4860 jint unicode_ch;
4861 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4862 p = tmp_p;
4863 last_is_slash = false;
4864 // Check if ch is Java identifier start or is Java identifier part
4865 // 4672820: call java.lang.Character methods directly without generating separate tables.
4866 EXCEPTION_MARK;
4867 // return value
4868 JavaValue result(T_BOOLEAN);
4869 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4870 JavaCallArguments args;
4871 args.push_int(unicode_ch);
4872
4873 if (not_first_ch) {
4874 // public static boolean isJavaIdentifierPart(char ch);
4875 JavaCalls::call_static(&result,
4876 vmClasses::Character_klass(),
4877 vmSymbols::isJavaIdentifierPart_name(),
4878 vmSymbols::int_bool_signature(),
4879 &args,
4880 THREAD);
4881 } else {
4882 // public static boolean isJavaIdentifierStart(char ch);
4883 JavaCalls::call_static(&result,
4884 vmClasses::Character_klass(),
4885 vmSymbols::isJavaIdentifierStart_name(),
4886 vmSymbols::int_bool_signature(),
4887 &args,
4888 THREAD);
4889 }
4890 if (HAS_PENDING_EXCEPTION) {
4891 CLEAR_PENDING_EXCEPTION;
4892 return nullptr;
4893 }
4894 if(result.get_jboolean()) {
4895 continue;
4896 }
4897 }
4898 return (not_first_ch) ? old_p : nullptr;
4899 }
4900 return (not_first_ch && !last_is_slash) ? p : nullptr;
4901 }
4902
4903 // Take pointer to a UTF8 byte string (not NUL-terminated).
4904 // Skip over the longest part of the string that could
4905 // be taken as a field signature. Allow "void" if void_ok.
4906 // Return a pointer to just past the signature.
4907 // Return null if no legal signature is found.
4908 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4909 bool void_ok,
4910 unsigned int length,
4911 TRAPS) const {
4912 unsigned int array_dim = 0;
4913 while (length > 0) {
4914 switch (signature[0]) {
4915 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4916 case JVM_SIGNATURE_BOOLEAN:
4917 case JVM_SIGNATURE_BYTE:
4918 case JVM_SIGNATURE_CHAR:
4919 case JVM_SIGNATURE_SHORT:
4920 case JVM_SIGNATURE_INT:
4921 case JVM_SIGNATURE_FLOAT:
4922 case JVM_SIGNATURE_LONG:
4923 case JVM_SIGNATURE_DOUBLE:
4924 return signature + 1;
4925 case JVM_SIGNATURE_CLASS:
4926 {
4927 if (_major_version < JAVA_1_5_VERSION) {
4928 signature++;
4929 length--;
4930 // Skip over the class name if one is there
4931 const char* const p = skip_over_field_name(signature, true, length);
4932 assert(p == nullptr || p > signature, "must parse one character at least");
4933 // The next character better be a semicolon
4934 if (p != nullptr && // Parse of field name succeeded.
4935 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4936 p[0] == JVM_SIGNATURE_ENDCLASS) {
4937 return p + 1;
4938 }
4939 }
4940 else {
4941 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4942 signature++;
4943 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4944 // Format check signature
4945 if (c != nullptr) {
4946 int newlen = pointer_delta_as_int(c, (char*) signature);
4947 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4948 if (!legal) {
4949 classfile_parse_error("Class name is empty or contains illegal character "
4950 "in descriptor in class file %s",
4951 THREAD);
4952 return nullptr;
4953 }
4954 return signature + newlen + 1;
4955 }
4956 }
4957 return nullptr;
4958 }
4959 case JVM_SIGNATURE_ARRAY:
4960 array_dim++;
4961 if (array_dim > 255) {
4962 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4963 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4964 return nullptr;
4965 }
4966 // The rest of what's there better be a legal signature
4967 signature++;
4968 length--;
4969 void_ok = false;
4970 break;
4971 default:
4972 return nullptr;
4973 }
4974 }
4975 return nullptr;
4976 }
4977
4978 // Checks if name is a legal class name.
4979 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4980 if (!_need_verify) { return; }
4981
4982 assert(name->refcount() > 0, "symbol must be kept alive");
4983 char* bytes = (char*)name->bytes();
4984 unsigned int length = name->utf8_length();
4985 bool legal = false;
4986
4987 if (length > 0) {
4988 const char* p;
4989 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4990 p = skip_over_field_signature(bytes, false, length, CHECK);
4991 legal = (p != nullptr) && ((p - bytes) == (int)length);
4992 } else if (_major_version < JAVA_1_5_VERSION) {
4993 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4994 p = skip_over_field_name(bytes, true, length);
4995 legal = (p != nullptr) && ((p - bytes) == (int)length);
4996 }
4997 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4998 && bytes[length - 1] == ';' ) {
4999 // Support for L...; descriptors
5000 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5001 } else {
5002 // 4900761: relax the constraints based on JSR202 spec
5003 // Class names may be drawn from the entire Unicode character set.
5004 // Identifiers between '/' must be unqualified names.
5005 // The utf8 string has been verified when parsing cpool entries.
5006 legal = verify_unqualified_name(bytes, length, LegalClass);
5007 }
5008 }
5009 if (!legal) {
5010 ResourceMark rm(THREAD);
5011 assert(_class_name != nullptr, "invariant");
5012 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5013 Exceptions::fthrow(
5014 THREAD_AND_LOCATION,
5015 vmSymbols::java_lang_ClassFormatError(),
5016 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5017 _class_name->as_C_string()
5018 );
5019 return;
5020 }
5021 }
5022
5023 // Checks if name is a legal field name.
5024 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5025 if (!_need_verify) { return; }
5026
5027 char* bytes = (char*)name->bytes();
5028 unsigned int length = name->utf8_length();
5029 bool legal = false;
5030
5031 if (length > 0) {
5032 if (_major_version < JAVA_1_5_VERSION) {
5033 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5034 const char* p = skip_over_field_name(bytes, false, length);
5035 legal = (p != nullptr) && ((p - bytes) == (int)length);
5036 }
5037 } else {
5038 // 4881221: relax the constraints based on JSR202 spec
5039 legal = verify_unqualified_name(bytes, length, LegalField);
5040 }
5041 }
5042
5043 if (!legal) {
5044 ResourceMark rm(THREAD);
5045 assert(_class_name != nullptr, "invariant");
5046 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5047 Exceptions::fthrow(
5048 THREAD_AND_LOCATION,
5049 vmSymbols::java_lang_ClassFormatError(),
5050 "Illegal field name \"%.*s\" in class %s", length, bytes,
5051 _class_name->as_C_string()
5052 );
5053 return;
5054 }
5055 }
5056
5057 // Checks if name is a legal method name.
5058 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5059 if (!_need_verify) { return; }
5060
5061 assert(name != nullptr, "method name is null");
5062 char* bytes = (char*)name->bytes();
5063 unsigned int length = name->utf8_length();
5064 bool legal = false;
5065
5066 if (length > 0) {
5067 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5068 if (name == vmSymbols::object_initializer_name() ||
5069 name == vmSymbols::class_initializer_name()) {
5070 legal = true;
5071 }
5072 } else if (_major_version < JAVA_1_5_VERSION) {
5073 const char* p;
5074 p = skip_over_field_name(bytes, false, length);
5075 legal = (p != nullptr) && ((p - bytes) == (int)length);
5076 } else {
5077 // 4881221: relax the constraints based on JSR202 spec
5078 legal = verify_unqualified_name(bytes, length, LegalMethod);
5079 }
5080 }
5081
5082 if (!legal) {
5083 ResourceMark rm(THREAD);
5084 assert(_class_name != nullptr, "invariant");
5085 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5086 Exceptions::fthrow(
5087 THREAD_AND_LOCATION,
5088 vmSymbols::java_lang_ClassFormatError(),
5089 "Illegal method name \"%.*s\" in class %s", length, bytes,
5090 _class_name->as_C_string()
5091 );
5092 return;
5093 }
5094 }
5095
5096 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5097 const char* const bytes = (const char*)signature->bytes();
5098 const unsigned int length = signature->utf8_length();
5099 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5100
5101 if (p == nullptr || (p - bytes) != (int)length) {
5102 return false;
5103 }
5104 return true;
5105 }
5106
5107 // Checks if signature is a legal field signature.
5108 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5109 const Symbol* signature,
5110 TRAPS) const {
5111 if (!_need_verify) { return; }
5112
5113 const char* const bytes = (const char*)signature->bytes();
5114 const unsigned int length = signature->utf8_length();
5115 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5116
5117 if (p == nullptr || (p - bytes) != (int)length) {
5118 throwIllegalSignature("Field", name, signature, CHECK);
5119 }
5120 }
5121
5122 // Check that the signature is compatible with the method name. For example,
5123 // check that <init> has a void signature.
5124 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5125 const Symbol* signature,
5126 TRAPS) const {
5127 if (!_need_verify) {
5128 return;
5129 }
5130
5131 // Class initializers cannot have args for class format version >= 51.
5132 if (name == vmSymbols::class_initializer_name() &&
5133 signature != vmSymbols::void_method_signature() &&
5134 _major_version >= JAVA_7_VERSION) {
5135 throwIllegalSignature("Method", name, signature, THREAD);
5136 return;
5137 }
5138
5139 int sig_length = signature->utf8_length();
5140 if (name->utf8_length() > 0 &&
5141 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5142 sig_length > 0 &&
5143 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5144 throwIllegalSignature("Method", name, signature, THREAD);
5145 }
5146 }
5147
5148 // Checks if signature is a legal method signature.
5149 // Returns number of parameters
5150 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5151 const Symbol* signature,
5152 TRAPS) const {
5153 if (!_need_verify) {
5154 // make sure caller's args_size will be less than 0 even for non-static
5155 // method so it will be recomputed in compute_size_of_parameters().
5156 return -2;
5157 }
5158
5159 unsigned int args_size = 0;
5160 const char* p = (const char*)signature->bytes();
5161 unsigned int length = signature->utf8_length();
5162 const char* nextp;
5163
5164 // The first character must be a '('
5165 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5166 length--;
5167 // Skip over legal field signatures
5168 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5169 while ((length > 0) && (nextp != nullptr)) {
5170 args_size++;
5171 if (p[0] == 'J' || p[0] == 'D') {
5172 args_size++;
5173 }
5174 length -= pointer_delta_as_int(nextp, p);
5175 p = nextp;
5176 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5177 }
5178 // The first non-signature thing better be a ')'
5179 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5180 length--;
5181 // Now we better just have a return value
5182 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5183 if (nextp && ((int)length == (nextp - p))) {
5184 return args_size;
5185 }
5186 }
5187 }
5188 // Report error
5189 throwIllegalSignature("Method", name, signature, THREAD);
5190 return 0;
5191 }
5192
5193 int ClassFileParser::static_field_size() const {
5194 assert(_layout_info != nullptr, "invariant");
5195 return _layout_info->_static_field_size;
5196 }
5197
5198 int ClassFileParser::total_oop_map_count() const {
5199 assert(_layout_info != nullptr, "invariant");
5200 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5201 }
5202
5203 jint ClassFileParser::layout_size() const {
5204 assert(_layout_info != nullptr, "invariant");
5205 return _layout_info->_instance_size;
5206 }
5207
5208 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5209 const Array<Method*>* methods) {
5210 assert(ik != nullptr, "invariant");
5211 assert(methods != nullptr, "invariant");
5212
5213 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5214 // (We used to do this lazily, but now we query it in Rewriter,
5215 // which is eagerly done for every method, so we might as well do it now,
5216 // when everything is fresh in memory.)
5217 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5218
5219 if (klass_id != vmSymbolID::NO_SID) {
5220 for (int j = 0; j < methods->length(); ++j) {
5221 Method* method = methods->at(j);
5222 method->init_intrinsic_id(klass_id);
5223
5224 if (CheckIntrinsics) {
5225 // Check if an intrinsic is defined for method 'method',
5226 // but the method is not annotated with @IntrinsicCandidate.
5227 if (method->intrinsic_id() != vmIntrinsics::_none &&
5228 !method->intrinsic_candidate()) {
5229 tty->print("Compiler intrinsic is defined for method [%s], "
5230 "but the method is not annotated with @IntrinsicCandidate.%s",
5231 method->name_and_sig_as_C_string(),
5232 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5233 );
5234 tty->cr();
5235 DEBUG_ONLY(vm_exit(1));
5236 }
5237 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5238 // but there is no intrinsic available for it.
5239 if (method->intrinsic_candidate() &&
5240 method->intrinsic_id() == vmIntrinsics::_none) {
5241 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5242 "but no compiler intrinsic is defined for the method.%s",
5243 method->name_and_sig_as_C_string(),
5244 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5245 );
5246 tty->cr();
5247 DEBUG_ONLY(vm_exit(1));
5248 }
5249 }
5250 } // end for
5251
5252 #ifdef ASSERT
5253 if (CheckIntrinsics) {
5254 // Check for orphan methods in the current class. A method m
5255 // of a class C is orphan if an intrinsic is defined for method m,
5256 // but class C does not declare m.
5257 // The check is potentially expensive, therefore it is available
5258 // only in debug builds.
5259
5260 for (auto id : EnumRange<vmIntrinsicID>{}) {
5261 if (vmIntrinsics::_compiledLambdaForm == id) {
5262 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5263 // generated for the JVM from a LambdaForm and therefore no method
5264 // is defined for it.
5265 continue;
5266 }
5267 if (vmIntrinsics::_blackhole == id) {
5268 // The _blackhole intrinsic is a special marker. No explicit method
5269 // is defined for it.
5270 continue;
5271 }
5272
5273 if (vmIntrinsics::class_for(id) == klass_id) {
5274 // Check if the current class contains a method with the same
5275 // name, flags, signature.
5276 bool match = false;
5277 for (int j = 0; j < methods->length(); ++j) {
5278 const Method* method = methods->at(j);
5279 if (method->intrinsic_id() == id) {
5280 match = true;
5281 break;
5282 }
5283 }
5284
5285 if (!match) {
5286 char buf[1000];
5287 tty->print("Compiler intrinsic is defined for method [%s], "
5288 "but the method is not available in class [%s].%s",
5289 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5290 ik->name()->as_C_string(),
5291 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5292 );
5293 tty->cr();
5294 DEBUG_ONLY(vm_exit(1));
5295 }
5296 }
5297 } // end for
5298 } // CheckIntrinsics
5299 #endif // ASSERT
5300 }
5301 }
5302
5303 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5304 const ClassInstanceInfo& cl_inst_info,
5305 TRAPS) {
5306 if (_klass != nullptr) {
5307 return _klass;
5308 }
5309
5310 InstanceKlass* const ik =
5311 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5312
5313 if (is_hidden()) {
5314 mangle_hidden_class_name(ik);
5315 }
5316
5317 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5318
5319 assert(_klass == ik, "invariant");
5320 return ik;
5321 }
5322
5323 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5324 bool changed_by_loadhook,
5325 const ClassInstanceInfo& cl_inst_info,
5326 TRAPS) {
5327 assert(ik != nullptr, "invariant");
5328
5329 // Set name and CLD before adding to CLD
5330 ik->set_class_loader_data(_loader_data);
5331 ik->set_class_loader_type();
5332 ik->set_name(_class_name);
5333
5334 // Add all classes to our internal class loader list here,
5335 // including classes in the bootstrap (null) class loader.
5336 const bool publicize = !is_internal();
5337
5338 _loader_data->add_class(ik, publicize);
5339
5340 set_klass_to_deallocate(ik);
5341
5342 assert(_layout_info != nullptr, "invariant");
5343 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5344 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5345 "sanity");
5346
5347 assert(ik->is_instance_klass(), "sanity");
5348 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5349
5350 // Fill in information already parsed
5351 ik->set_should_verify_class(_need_verify);
5352
5353 // Not yet: supers are done below to support the new subtype-checking fields
5354 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5355 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5356 ik->set_has_strict_static_fields(_has_strict_static_fields);
5357
5358 if (_layout_info->_is_naturally_atomic) {
5359 ik->set_is_naturally_atomic();
5360 }
5361
5362 if (_layout_info->_must_be_atomic) {
5363 ik->set_must_be_atomic();
5364 }
5365
5366 ik->set_static_oop_field_count(_static_oop_count);
5367
5368 // this transfers ownership of a lot of arrays from
5369 // the parser onto the InstanceKlass*
5370 apply_parsed_class_metadata(ik, _java_fields_count);
5371 if (ik->is_inline_klass()) {
5372 InlineKlass::cast(ik)->init_fixed_block();
5373 }
5374
5375 // can only set dynamic nest-host after static nest information is set
5376 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5377 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5378 }
5379
5380 // note that is not safe to use the fields in the parser from this point on
5381 assert(nullptr == _cp, "invariant");
5382 assert(nullptr == _fieldinfo_stream, "invariant");
5383 assert(nullptr == _fieldinfo_search_table, "invariant");
5384 assert(nullptr == _fields_status, "invariant");
5385 assert(nullptr == _methods, "invariant");
5386 assert(nullptr == _inner_classes, "invariant");
5387 assert(nullptr == _nest_members, "invariant");
5388 assert(nullptr == _loadable_descriptors, "invariant");
5389 assert(nullptr == _combined_annotations, "invariant");
5390 assert(nullptr == _record_components, "invariant");
5391 assert(nullptr == _permitted_subclasses, "invariant");
5392 assert(nullptr == _inline_layout_info_array, "invariant");
5393
5394 if (_has_localvariable_table) {
5395 ik->set_has_localvariable_table(true);
5396 }
5397
5398 if (_has_final_method) {
5399 ik->set_has_final_method();
5400 }
5401
5402 ik->copy_method_ordering(_method_ordering, CHECK);
5403 // The InstanceKlass::_methods_jmethod_ids cache
5404 // is managed on the assumption that the initial cache
5405 // size is equal to the number of methods in the class. If
5406 // that changes, then InstanceKlass::idnum_can_increment()
5407 // has to be changed accordingly.
5408 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5409
5410 ik->set_this_class_index(_this_class_index);
5411
5412 if (_is_hidden) {
5413 // _this_class_index is a CONSTANT_Class entry that refers to this
5414 // hidden class itself. If this class needs to refer to its own methods
5415 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5416 // _this_class_index. However, because this class is hidden (it's
5417 // not stored in SystemDictionary), _this_class_index cannot be resolved
5418 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5419 // Therefore, we must eagerly resolve _this_class_index now.
5420 ik->constants()->klass_at_put(_this_class_index, ik);
5421 }
5422
5423 ik->set_minor_version(_minor_version);
5424 ik->set_major_version(_major_version);
5425 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5426 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5427
5428 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5429
5430 // Set PackageEntry for this_klass
5431 oop cl = ik->class_loader();
5432 Handle clh = Handle(THREAD, cl);
5433 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5434 ik->set_package(cld, nullptr, CHECK);
5435
5436 const Array<Method*>* const methods = ik->methods();
5437 assert(methods != nullptr, "invariant");
5438 const int methods_len = methods->length();
5439
5440 check_methods_for_intrinsics(ik, methods);
5441
5442 // Fill in field values obtained by parse_classfile_attributes
5443 if (_parsed_annotations->has_any_annotations())
5444 _parsed_annotations->apply_to(ik);
5445
5446 apply_parsed_class_attributes(ik);
5447
5448 // Miranda methods
5449 if ((_num_miranda_methods > 0) ||
5450 // if this class introduced new miranda methods or
5451 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5452 // super class exists and this class inherited miranda methods
5453 ) {
5454 ik->set_has_miranda_methods(); // then set a flag
5455 }
5456
5457 // Fill in information needed to compute superclasses.
5458 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5459 ik->set_transitive_interfaces(_transitive_interfaces);
5460 ik->set_local_interfaces(_local_interfaces);
5461 _transitive_interfaces = nullptr;
5462 _local_interfaces = nullptr;
5463
5464 // Initialize itable offset tables
5465 klassItable::setup_itable_offset_table(ik);
5466
5467 // Compute transitive closure of interfaces this class implements
5468 // Do final class setup
5469 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5470 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5471 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5472 }
5473
5474 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5475 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5476 ik->set_has_contended_annotations(true);
5477 }
5478
5479 // Fill in has_finalizer and layout_helper
5480 set_precomputed_flags(ik);
5481
5482 // check if this class can access its super class
5483 check_super_class_access(ik, CHECK);
5484
5485 // check if this class can access its superinterfaces
5486 check_super_interface_access(ik, CHECK);
5487
5488 // check if this class overrides any final method
5489 check_final_method_override(ik, CHECK);
5490
5491 // reject static interface methods prior to Java 8
5492 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5493 check_illegal_static_method(ik, CHECK);
5494 }
5495
5496 // Obtain this_klass' module entry
5497 ModuleEntry* module_entry = ik->module();
5498 assert(module_entry != nullptr, "module_entry should always be set");
5499
5500 // Obtain java.lang.Module
5501 Handle module_handle(THREAD, module_entry->module_oop());
5502
5503 // Allocate mirror and initialize static fields
5504 java_lang_Class::create_mirror(ik,
5505 Handle(THREAD, _loader_data->class_loader()),
5506 module_handle,
5507 _protection_domain,
5508 cl_inst_info.class_data(),
5509 CHECK);
5510
5511 assert(_all_mirandas != nullptr, "invariant");
5512
5513 // Generate any default methods - default methods are public interface methods
5514 // that have a default implementation. This is new with Java 8.
5515 if (_has_nonstatic_concrete_methods) {
5516 DefaultMethods::generate_default_methods(ik,
5517 _all_mirandas,
5518 CHECK);
5519 }
5520
5521 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5522 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5523 !module_entry->has_default_read_edges()) {
5524 if (!module_entry->set_has_default_read_edges()) {
5525 // We won a potential race
5526 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5527 }
5528 }
5529
5530 if (is_inline_type()) {
5531 InlineKlass* vk = InlineKlass::cast(ik);
5532 vk->set_payload_alignment(_layout_info->_payload_alignment);
5533 vk->set_payload_offset(_layout_info->_payload_offset);
5534 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5535 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5536 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5537 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5538 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5539 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5540 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5541 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5542 vk->initialize_calling_convention(CHECK);
5543 }
5544
5545 if (EnableValhalla && !access_flags().is_identity_class() && !access_flags().is_interface()
5546 && _class_name != vmSymbols::java_lang_Object() && UseAltSubstitutabilityMethod) {
5547 // Both abstract and concrete value classes need a field map for acmp
5548 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5549 // Current format of acmp maps:
5550 // All maps are stored contiguously in a single int array because it might
5551 // be too early to instantiate an Object array (to be investigated)
5552 // Format is:
5553 // [number_of_nonoop_entries][offset0][size[0][offset1][size1]...[oop_offset0][oop_offset1]...
5554 // ^ ^
5555 // | |
5556 // --------------------- Pair of integer describing a segment of
5557 // contiguous non-oop fields
5558 // First element is the number of segment of contiguous non-oop fields
5559 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5560 // the offset then the size.
5561 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5562 // per oop field, containing the offset of the field.
5563 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5564 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5565 typeArrayOop map = oopFactory::new_intArray(nonoop_acmp_map_size + oop_acmp_map_size + 1, CHECK);
5566 typeArrayHandle map_h(THREAD, map);
5567 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5568 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5569 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first);
5570 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second);
5571 }
5572 int oop_map_start = nonoop_acmp_map_size + 1;
5573 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5574 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5575 }
5576 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5577 }
5578
5579 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5580
5581 if (!is_internal()) {
5582 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5583
5584 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5585 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5586 log_is_enabled(Info, class, preview)) {
5587 ResourceMark rm;
5588 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5589 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5590 }
5591
5592 if (log_is_enabled(Debug, class, resolve)) {
5593 ResourceMark rm;
5594 // print out the superclass.
5595 const char * from = ik->external_name();
5596 if (ik->super() != nullptr) {
5597 log_debug(class, resolve)("%s %s (super)",
5598 from,
5599 ik->super()->external_name());
5600 }
5601 // print out each of the interface classes referred to by this class.
5602 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5603 if (local_interfaces != nullptr) {
5604 const int length = local_interfaces->length();
5605 for (int i = 0; i < length; i++) {
5606 const InstanceKlass* const k = local_interfaces->at(i);
5607 const char * to = k->external_name();
5608 log_debug(class, resolve)("%s %s (interface)", from, to);
5609 }
5610 }
5611 }
5612 }
5613
5614 JFR_ONLY(INIT_ID(ik);)
5615
5616 // If we reach here, all is well.
5617 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5618 // in order for it to not be destroyed in the ClassFileParser destructor.
5619 set_klass_to_deallocate(nullptr);
5620
5621 // it's official
5622 set_klass(ik);
5623
5624 DEBUG_ONLY(ik->verify();)
5625 }
5626
5627 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5628 // Decrement the refcount in the old name, since we're clobbering it.
5629 _class_name->decrement_refcount();
5630
5631 _class_name = new_class_name;
5632 // Increment the refcount of the new name.
5633 // Now the ClassFileParser owns this name and will decrement in
5634 // the destructor.
5635 _class_name->increment_refcount();
5636 }
5637
5638 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5639 Symbol* name,
5640 ClassLoaderData* loader_data,
5641 const ClassLoadInfo* cl_info,
5642 Publicity pub_level,
5643 TRAPS) :
5644 _stream(stream),
5645 _class_name(nullptr),
5646 _loader_data(loader_data),
5647 _is_hidden(cl_info->is_hidden()),
5648 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5649 _orig_cp_size(0),
5650 _static_oop_count(0),
5651 _super_klass(),
5652 _cp(nullptr),
5653 _fieldinfo_stream(nullptr),
5654 _fieldinfo_search_table(nullptr),
5655 _fields_status(nullptr),
5656 _methods(nullptr),
5657 _inner_classes(nullptr),
5658 _nest_members(nullptr),
5659 _nest_host(0),
5660 _permitted_subclasses(nullptr),
5661 _loadable_descriptors(nullptr),
5662 _record_components(nullptr),
5663 _local_interfaces(nullptr),
5664 _local_interface_indexes(nullptr),
5665 _transitive_interfaces(nullptr),
5666 _combined_annotations(nullptr),
5667 _class_annotations(nullptr),
5668 _class_type_annotations(nullptr),
5669 _fields_annotations(nullptr),
5670 _fields_type_annotations(nullptr),
5671 _klass(nullptr),
5672 _klass_to_deallocate(nullptr),
5673 _parsed_annotations(nullptr),
5674 _layout_info(nullptr),
5675 _inline_layout_info_array(nullptr),
5676 _temp_field_info(nullptr),
5677 _method_ordering(nullptr),
5678 _all_mirandas(nullptr),
5679 _vtable_size(0),
5680 _itable_size(0),
5681 _num_miranda_methods(0),
5682 _protection_domain(cl_info->protection_domain()),
5683 _access_flags(),
5684 _pub_level(pub_level),
5685 _bad_constant_seen(0),
5686 _synthetic_flag(false),
5687 _sde_length(false),
5688 _sde_buffer(nullptr),
5689 _sourcefile_index(0),
5690 _generic_signature_index(0),
5691 _major_version(0),
5692 _minor_version(0),
5693 _this_class_index(0),
5694 _super_class_index(0),
5695 _itfs_len(0),
5696 _java_fields_count(0),
5697 _need_verify(false),
5698 _has_nonstatic_concrete_methods(false),
5699 _declares_nonstatic_concrete_methods(false),
5700 _has_localvariable_table(false),
5701 _has_final_method(false),
5702 _has_contended_fields(false),
5703 _has_aot_runtime_setup_method(false),
5704 _has_strict_static_fields(false),
5705 _has_inline_type_fields(false),
5706 _is_naturally_atomic(false),
5707 _must_be_atomic(true),
5708 _has_loosely_consistent_annotation(false),
5709 _has_finalizer(false),
5710 _has_empty_finalizer(false),
5711 _max_bootstrap_specifier_index(-1) {
5712
5713 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5714 _class_name->increment_refcount();
5715
5716 assert(_loader_data != nullptr, "invariant");
5717 assert(stream != nullptr, "invariant");
5718 assert(_stream != nullptr, "invariant");
5719 assert(_stream->buffer() == _stream->current(), "invariant");
5720 assert(_class_name != nullptr, "invariant");
5721 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5722
5723 // Figure out whether we can skip format checking (matching classic VM behavior)
5724 // Always verify CFLH bytes from the user agents.
5725 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5726
5727 // synch back verification state to stream to check for truncation.
5728 stream->set_need_verify(_need_verify);
5729
5730 parse_stream(stream, CHECK);
5731
5732 post_process_parsed_stream(stream, _cp, CHECK);
5733 }
5734
5735 void ClassFileParser::clear_class_metadata() {
5736 // metadata created before the instance klass is created. Must be
5737 // deallocated if classfile parsing returns an error.
5738 _cp = nullptr;
5739 _fieldinfo_stream = nullptr;
5740 _fieldinfo_search_table = nullptr;
5741 _fields_status = nullptr;
5742 _methods = nullptr;
5743 _inner_classes = nullptr;
5744 _nest_members = nullptr;
5745 _permitted_subclasses = nullptr;
5746 _loadable_descriptors = nullptr;
5747 _combined_annotations = nullptr;
5748 _class_annotations = _class_type_annotations = nullptr;
5749 _fields_annotations = _fields_type_annotations = nullptr;
5750 _record_components = nullptr;
5751 _inline_layout_info_array = nullptr;
5752 }
5753
5754 // Destructor to clean up
5755 ClassFileParser::~ClassFileParser() {
5756 _class_name->decrement_refcount();
5757
5758 if (_cp != nullptr) {
5759 MetadataFactory::free_metadata(_loader_data, _cp);
5760 }
5761
5762 if (_fieldinfo_stream != nullptr) {
5763 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5764 }
5765 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5766
5767 if (_fields_status != nullptr) {
5768 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5769 }
5770
5771 if (_inline_layout_info_array != nullptr) {
5772 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5773 }
5774
5775 if (_methods != nullptr) {
5776 // Free methods
5777 InstanceKlass::deallocate_methods(_loader_data, _methods);
5778 }
5779
5780 // beware of the Universe::empty_blah_array!!
5781 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5782 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5783 }
5784
5785 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5786 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5787 }
5788
5789 if (_record_components != nullptr) {
5790 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5791 }
5792
5793 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5794 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5795 }
5796
5797 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5798 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5799 }
5800
5801 // Free interfaces
5802 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5803 _local_interfaces, _transitive_interfaces);
5804
5805 if (_combined_annotations != nullptr) {
5806 // After all annotations arrays have been created, they are installed into the
5807 // Annotations object that will be assigned to the InstanceKlass being created.
5808
5809 // Deallocate the Annotations object and the installed annotations arrays.
5810 _combined_annotations->deallocate_contents(_loader_data);
5811
5812 // If the _combined_annotations pointer is non-null,
5813 // then the other annotations fields should have been cleared.
5814 assert(_class_annotations == nullptr, "Should have been cleared");
5815 assert(_class_type_annotations == nullptr, "Should have been cleared");
5816 assert(_fields_annotations == nullptr, "Should have been cleared");
5817 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5818 } else {
5819 // If the annotations arrays were not installed into the Annotations object,
5820 // then they have to be deallocated explicitly.
5821 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5822 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5823 Annotations::free_contents(_loader_data, _fields_annotations);
5824 Annotations::free_contents(_loader_data, _fields_type_annotations);
5825 }
5826
5827 clear_class_metadata();
5828 _transitive_interfaces = nullptr;
5829 _local_interfaces = nullptr;
5830
5831 // deallocate the klass if already created. Don't directly deallocate, but add
5832 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5833 // at a safepoint.
5834 if (_klass_to_deallocate != nullptr) {
5835 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5836 }
5837 }
5838
5839 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5840 TRAPS) {
5841
5842 assert(stream != nullptr, "invariant");
5843 assert(_class_name != nullptr, "invariant");
5844
5845 // BEGIN STREAM PARSING
5846 stream->guarantee_more(8, CHECK); // magic, major, minor
5847 // Magic value
5848 const u4 magic = stream->get_u4_fast();
5849 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5850 "Incompatible magic value %u in class file %s",
5851 magic, CHECK);
5852
5853 // Version numbers
5854 _minor_version = stream->get_u2_fast();
5855 _major_version = stream->get_u2_fast();
5856
5857 // Check version numbers - we check this even with verifier off
5858 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5859
5860 stream->guarantee_more(3, CHECK); // length, first cp tag
5861 u2 cp_size = stream->get_u2_fast();
5862
5863 guarantee_property(
5864 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5865 cp_size, CHECK);
5866
5867 _orig_cp_size = cp_size;
5868 if (is_hidden()) { // Add a slot for hidden class name.
5869 cp_size++;
5870 }
5871
5872 _cp = ConstantPool::allocate(_loader_data,
5873 cp_size,
5874 CHECK);
5875
5876 ConstantPool* const cp = _cp;
5877
5878 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5879
5880 assert(cp_size == (u2)cp->length(), "invariant");
5881
5882 // ACCESS FLAGS
5883 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5884
5885 // Access flags
5886 u2 flags;
5887 // JVM_ACC_MODULE is defined in JDK-9 and later.
5888 if (_major_version >= JAVA_9_VERSION) {
5889 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5890 } else {
5891 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5892 }
5893
5894 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5895 // Set abstract bit for old class files for backward compatibility
5896 flags |= JVM_ACC_ABSTRACT;
5897 }
5898
5899 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5900 if (!supports_inline_types()) {
5901 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5902 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5903 if (!is_module && !is_interface) {
5904 flags |= JVM_ACC_IDENTITY;
5905 }
5906 }
5907
5908 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5909
5910 short bad_constant = class_bad_constant_seen();
5911 if (bad_constant != 0) {
5912 // Do not throw CFE until after the access_flags are checked because if
5913 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5914 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5915 return;
5916 }
5917
5918 _access_flags.set_flags(flags);
5919
5920 // This class and superclass
5921 _this_class_index = stream->get_u2_fast();
5922 guarantee_property(
5923 valid_cp_range(_this_class_index, cp_size) &&
5924 cp->tag_at(_this_class_index).is_unresolved_klass(),
5925 "Invalid this class index %u in constant pool in class file %s",
5926 _this_class_index, CHECK);
5927
5928 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5929 assert(class_name_in_cp != nullptr, "class_name can't be null");
5930
5931 // Don't need to check whether this class name is legal or not.
5932 // It has been checked when constant pool is parsed.
5933 // However, make sure it is not an array type.
5934 if (_need_verify) {
5935 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5936 "Bad class name in class file %s",
5937 CHECK);
5938 }
5939
5940 #ifdef ASSERT
5941 // Basic sanity checks
5942 if (_is_hidden) {
5943 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5944 }
5945 #endif
5946
5947 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5948
5949 if (_is_hidden) {
5950 assert(_class_name != nullptr, "Unexpected null _class_name");
5951 #ifdef ASSERT
5952 if (_need_verify) {
5953 verify_legal_class_name(_class_name, CHECK);
5954 }
5955 #endif
5956
5957 } else {
5958 // Check if name in class file matches given name
5959 if (_class_name != class_name_in_cp) {
5960 if (_class_name != vmSymbols::unknown_class_name()) {
5961 ResourceMark rm(THREAD);
5962 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5963 Exceptions::fthrow(THREAD_AND_LOCATION,
5964 vmSymbols::java_lang_NoClassDefFoundError(),
5965 "%s (wrong name: %s)",
5966 _class_name->as_C_string(),
5967 class_name_in_cp->as_C_string()
5968 );
5969 return;
5970 } else {
5971 // The class name was not known by the caller so we set it from
5972 // the value in the CP.
5973 update_class_name(class_name_in_cp);
5974 }
5975 // else nothing to do: the expected class name matches what is in the CP
5976 }
5977 }
5978
5979 // Verification prevents us from creating names with dots in them, this
5980 // asserts that that's the case.
5981 assert(is_internal_format(_class_name), "external class name format used internally");
5982
5983 if (!is_internal()) {
5984 LogTarget(Debug, class, preorder) lt;
5985 if (lt.is_enabled()){
5986 ResourceMark rm(THREAD);
5987 LogStream ls(lt);
5988 ls.print("%s", _class_name->as_klass_external_name());
5989 if (stream->source() != nullptr) {
5990 ls.print(" source: %s", stream->source());
5991 }
5992 ls.cr();
5993 }
5994 }
5995
5996 // SUPERKLASS
5997 _super_class_index = stream->get_u2_fast();
5998 check_super_class(cp,
5999 _super_class_index,
6000 _need_verify,
6001 CHECK);
6002
6003 // Interfaces
6004 _itfs_len = stream->get_u2_fast();
6005 parse_interfaces(stream,
6006 _itfs_len,
6007 cp,
6008 &_has_nonstatic_concrete_methods,
6009 CHECK);
6010
6011 // Fields (offsets are filled in later)
6012 parse_fields(stream,
6013 _access_flags,
6014 cp,
6015 cp_size,
6016 &_java_fields_count,
6017 CHECK);
6018
6019 assert(_temp_field_info != nullptr, "invariant");
6020
6021 // Methods
6022 parse_methods(stream,
6023 is_interface(),
6024 !is_identity_class(),
6025 is_abstract_class(),
6026 &_has_localvariable_table,
6027 &_has_final_method,
6028 &_declares_nonstatic_concrete_methods,
6029 CHECK);
6030
6031 assert(_methods != nullptr, "invariant");
6032
6033 if (_declares_nonstatic_concrete_methods) {
6034 _has_nonstatic_concrete_methods = true;
6035 }
6036
6037 // Additional attributes/annotations
6038 _parsed_annotations = new ClassAnnotationCollector();
6039 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6040
6041 assert(_inner_classes != nullptr, "invariant");
6042
6043 // Finalize the Annotations metadata object,
6044 // now that all annotation arrays have been created.
6045 create_combined_annotations(CHECK);
6046
6047 // Make sure this is the end of class file stream
6048 guarantee_property(stream->at_eos(),
6049 "Extra bytes at the end of class file %s",
6050 CHECK);
6051
6052 // all bytes in stream read and parsed
6053 }
6054
6055 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6056 ResourceMark rm;
6057 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6058 // use a '/' because that confuses finding the class's package. Also, can't
6059 // use an illegal char such as ';' because that causes serialization issues
6060 // and issues with hidden classes that create their own hidden classes.
6061 char addr_buf[20];
6062 if (CDSConfig::is_dumping_static_archive()) {
6063 // We want stable names for the archived hidden classes (only for static
6064 // archive for now). Spaces under default_SharedBaseAddress() will be
6065 // occupied by the archive at run time, so we know that no dynamically
6066 // loaded InstanceKlass will be placed under there.
6067 static volatile size_t counter = 0;
6068 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6069 size_t new_id = AtomicAccess::add(&counter, (size_t)1);
6070 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
6071 } else {
6072 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6073 }
6074 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6075 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6076 jio_snprintf(new_name, new_name_len, "%s+%s",
6077 _class_name->as_C_string(), addr_buf);
6078 update_class_name(SymbolTable::new_symbol(new_name));
6079
6080 // Add a Utf8 entry containing the hidden name.
6081 assert(_class_name != nullptr, "Unexpected null _class_name");
6082 int hidden_index = _orig_cp_size; // this is an extra slot we added
6083 _cp->symbol_at_put(hidden_index, _class_name);
6084
6085 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6086 // We have to update the resolved_klass_index and the name_index together
6087 // so extract the existing resolved_klass_index first.
6088 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6089 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6090 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6091 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6092 "Bad name_index");
6093 }
6094
6095 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6096 ConstantPool* cp,
6097 TRAPS) {
6098 assert(stream != nullptr, "invariant");
6099 assert(stream->at_eos(), "invariant");
6100 assert(cp != nullptr, "invariant");
6101 assert(_loader_data != nullptr, "invariant");
6102
6103 if (_class_name == vmSymbols::java_lang_Object()) {
6104 precond(_super_class_index == 0);
6105 precond(_super_klass == nullptr);
6106 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6107 "java.lang.Object cannot implement an interface in class file %s",
6108 CHECK);
6109 } else {
6110 // Set _super_klass after class file is parsed and format is checked
6111 assert(_super_class_index > 0, "any class other than Object must have a super class");
6112 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6113 if (is_interface()) {
6114 // Before attempting to resolve the superclass, check for class format
6115 // errors not checked yet.
6116 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6117 "Interfaces must have java.lang.Object as superclass in class file %s",
6118 CHECK);
6119 }
6120 Handle loader(THREAD, _loader_data->class_loader());
6121 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6122 // fast path to avoid lookup
6123 _super_klass = vmClasses::Object_klass();
6124 } else {
6125 _super_klass = (const InstanceKlass*)
6126 SystemDictionary::resolve_super_or_fail(_class_name,
6127 super_class_name,
6128 loader,
6129 true,
6130 CHECK);
6131 }
6132 }
6133
6134 if (_super_klass != nullptr) {
6135 if (_super_klass->is_interface()) {
6136 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6137 return;
6138 }
6139
6140 if (_super_klass->is_final()) {
6141 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6142 return;
6143 }
6144
6145 if (EnableValhalla) {
6146 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6147 }
6148
6149 if (_super_klass->has_nonstatic_concrete_methods()) {
6150 _has_nonstatic_concrete_methods = true;
6151 }
6152 }
6153
6154 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6155 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6156 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6157 _class_name->as_klass_external_name()));
6158 }
6159
6160 // Determining is the class allows tearing or not (default is not)
6161 if (EnableValhalla && !_access_flags.is_identity_class()) {
6162 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6163 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6164 // Conditions above are not sufficient to determine atomicity requirements,
6165 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6166 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6167 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6168 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6169 _must_be_atomic = false;
6170 }
6171 // Apply VM options override
6172 if (*ForceNonTearable != '\0') {
6173 // Allow a command line switch to force the same atomicity property:
6174 const char* class_name_str = _class_name->as_C_string();
6175 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6176 _must_be_atomic = true;
6177 }
6178 }
6179 }
6180
6181 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6182 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6183 if (_local_interface_indexes != nullptr) {
6184 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6185 u2 interface_index = _local_interface_indexes->at(i);
6186 Klass* interf;
6187 if (cp->tag_at(interface_index).is_klass()) {
6188 interf = cp->resolved_klass_at(interface_index);
6189 } else {
6190 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6191
6192 // Don't need to check legal name because it's checked when parsing constant pool.
6193 // But need to make sure it's not an array type.
6194 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6195 "Bad interface name in class file %s", CHECK);
6196
6197 // Call resolve on the interface class name with class circularity checking
6198 interf = SystemDictionary::resolve_super_or_fail(
6199 _class_name,
6200 unresolved_klass,
6201 Handle(THREAD, _loader_data->class_loader()),
6202 false,
6203 CHECK);
6204 }
6205
6206 if (!interf->is_interface()) {
6207 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6208 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6209 _class_name->as_klass_external_name(),
6210 interf->external_name(),
6211 interf->class_in_module_of_loader()));
6212 }
6213
6214 if (EnableValhalla) {
6215 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6216 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6217 }
6218
6219 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6220 _has_nonstatic_concrete_methods = true;
6221 }
6222 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6223 }
6224 }
6225 assert(_local_interfaces != nullptr, "invariant");
6226
6227 // Compute the transitive list of all unique interfaces implemented by this class
6228 _transitive_interfaces =
6229 compute_transitive_interfaces(_super_klass,
6230 _local_interfaces,
6231 _loader_data,
6232 CHECK);
6233
6234 assert(_transitive_interfaces != nullptr, "invariant");
6235
6236 // sort methods
6237 _method_ordering = sort_methods(_methods);
6238
6239 _all_mirandas = new GrowableArray<Method*>(20);
6240
6241 Handle loader(THREAD, _loader_data->class_loader());
6242 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6243 &_num_miranda_methods,
6244 _all_mirandas,
6245 _super_klass,
6246 _methods,
6247 _access_flags,
6248 _major_version,
6249 loader,
6250 _class_name,
6251 _local_interfaces);
6252
6253 // Size of Java itable (in words)
6254 _itable_size = is_interface() ? 0 :
6255 klassItable::compute_itable_size(_transitive_interfaces);
6256
6257 assert(_parsed_annotations != nullptr, "invariant");
6258
6259 if (EnableValhalla) {
6260 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6261 java_fields_count(),
6262 CHECK);
6263 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6264 FieldInfo fieldinfo = *it;
6265 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6266 Symbol* sig = fieldinfo.signature(cp);
6267 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6268 // Pre-load classes of null-free fields that are candidate for flattening
6269 TempNewSymbol s = Signature::strip_envelope(sig);
6270 if (s == _class_name) {
6271 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6272 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6273 }
6274 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6275 "Cause: a null-free non-static field is declared with this type",
6276 s->as_C_string(), _class_name->as_C_string());
6277 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection(_class_name, s,
6278 Handle(THREAD,
6279 _loader_data->class_loader()),
6280 false, THREAD);
6281 if (HAS_PENDING_EXCEPTION) {
6282 log_info(class, preload)("Preloading of class %s during loading of class %s "
6283 "(cause: null-free non-static field) failed: %s",
6284 s->as_C_string(), _class_name->as_C_string(),
6285 PENDING_EXCEPTION->klass()->name()->as_C_string());
6286 return; // Exception is still pending
6287 }
6288 assert(klass != nullptr, "Sanity check");
6289 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6290 InlineKlass* vk = InlineKlass::cast(klass);
6291 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6292 log_info(class, preload)("Preloading of class %s during loading of class %s "
6293 "(cause: null-free non-static field) succeeded",
6294 s->as_C_string(), _class_name->as_C_string());
6295 } else if (Signature::has_envelope(sig) && PreloadClasses) {
6296 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6297 // Those classes would be required later for the flattening of nullable inline type fields
6298 TempNewSymbol name = Signature::strip_envelope(sig);
6299 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6300 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6301 "Cause: field type in LoadableDescriptors attribute",
6302 name->as_C_string(), _class_name->as_C_string());
6303 oop loader = loader_data()->class_loader();
6304 Klass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6305 Handle(THREAD, loader),
6306 false, THREAD);
6307 if (klass != nullptr) {
6308 if (klass->is_inline_klass()) {
6309 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6310 log_info(class, preload)("Preloading of class %s during loading of class %s "
6311 "(cause: field type in LoadableDescriptors attribute) succeeded",
6312 name->as_C_string(), _class_name->as_C_string());
6313 } else {
6314 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6315 log_info(class, preload)("Preloading of class %s during loading of class %s "
6316 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6317 name->as_C_string(), _class_name->as_C_string());
6318 }
6319 } else {
6320 log_info(class, preload)("Preloading of class %s during loading of class %s "
6321 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6322 name->as_C_string(), _class_name->as_C_string(),
6323 PENDING_EXCEPTION->klass()->name()->as_C_string());
6324 }
6325 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6326 if (HAS_PENDING_EXCEPTION) {
6327 CLEAR_PENDING_EXCEPTION;
6328 }
6329 } else {
6330 // Just poking the system dictionary to see if the class has already be loaded. Looking for migrated classes
6331 // used when --enable-preview when jdk isn't compiled with --enable-preview so doesn't include LoadableDescriptors.
6332 // This is temporary.
6333 oop loader = loader_data()->class_loader();
6334 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6335 if (klass != nullptr && klass->is_inline_klass()) {
6336 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6337 log_info(class, preload)("Preloading of class %s during loading of class %s "
6338 "(cause: field type not in LoadableDescriptors attribute) succeeded",
6339 name->as_C_string(), _class_name->as_C_string());
6340 }
6341 }
6342 }
6343 }
6344 }
6345
6346 _layout_info = new FieldLayoutInfo();
6347 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6348 _parsed_annotations->is_contended(), is_inline_type(),
6349 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6350 _must_be_atomic, _layout_info, _inline_layout_info_array);
6351 lb.build_layout();
6352 _has_inline_type_fields = _layout_info->_has_inline_fields;
6353
6354 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6355 _fieldinfo_stream =
6356 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6357 injected_fields_count, loader_data(), CHECK);
6358 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6359 _fields_status =
6360 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6361 FieldStatus(0), CHECK);
6362
6363 // Strict static fields track initialization status from the beginning of time.
6364 // After this class runs <clinit>, they will be verified as being "not unset".
6365 // See Step 8 of InstanceKlass::initialize_impl.
6366 if (_has_strict_static_fields) {
6367 bool found_one = false;
6368 for (int i = 0; i < _temp_field_info->length(); i++) {
6369 FieldInfo& fi = *_temp_field_info->adr_at(i);
6370 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6371 found_one = true;
6372 if (fi.initializer_index() != 0) {
6373 // skip strict static fields with ConstantValue attributes
6374 } else {
6375 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6376 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6377 }
6378 }
6379 }
6380 assert(found_one == _has_strict_static_fields,
6381 "correct prediction = %d", (int)_has_strict_static_fields);
6382 }
6383 }
6384
6385 void ClassFileParser::set_klass(InstanceKlass* klass) {
6386
6387 #ifdef ASSERT
6388 if (klass != nullptr) {
6389 assert(nullptr == _klass, "leaking?");
6390 }
6391 #endif
6392
6393 _klass = klass;
6394 }
6395
6396 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6397
6398 #ifdef ASSERT
6399 if (klass != nullptr) {
6400 assert(nullptr == _klass_to_deallocate, "leaking?");
6401 }
6402 #endif
6403
6404 _klass_to_deallocate = klass;
6405 }
6406
6407 // Caller responsible for ResourceMark
6408 // clone stream with rewound position
6409 const ClassFileStream* ClassFileParser::clone_stream() const {
6410 assert(_stream != nullptr, "invariant");
6411
6412 return _stream->clone();
6413 }
6414
6415 ReferenceType ClassFileParser::super_reference_type() const {
6416 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6417 }
6418
6419 bool ClassFileParser::is_instance_ref_klass() const {
6420 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6421 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6422 // klass requiring special treatment in ref-processing. The abstract
6423 // j.l.r.Reference cannot be instantiated so doesn't partake in
6424 // ref-processing.
6425 return is_java_lang_ref_Reference_subclass();
6426 }
6427
6428 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6429 if (_super_klass == nullptr) {
6430 return false;
6431 }
6432
6433 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6434 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6435 return true;
6436 }
6437
6438 return _super_klass->reference_type() != REF_NONE;
6439 }
6440
6441 // ----------------------------------------------------------------------------
6442 // debugging
6443
6444 #ifdef ASSERT
6445
6446 // return true if class_name contains no '.' (internal format is '/')
6447 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6448 if (class_name != nullptr) {
6449 ResourceMark rm;
6450 char* name = class_name->as_C_string();
6451 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6452 } else {
6453 return true;
6454 }
6455 }
6456
6457 #endif