1 /*
2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cdsConfig.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/classLoadInfo.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/fieldLayoutBuilder.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/systemDictionaryShared.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.hpp"
52 #include "oops/bsmAttribute.inline.hpp"
53 #include "oops/constantPool.inline.hpp"
54 #include "oops/fieldInfo.hpp"
55 #include "oops/fieldStreams.inline.hpp"
56 #include "oops/inlineKlass.inline.hpp"
57 #include "oops/instanceKlass.inline.hpp"
58 #include "oops/instanceMirrorKlass.hpp"
59 #include "oops/klass.inline.hpp"
60 #include "oops/klassVtable.hpp"
61 #include "oops/metadata.hpp"
62 #include "oops/method.inline.hpp"
63 #include "oops/oop.inline.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/symbol.hpp"
66 #include "prims/jvmtiExport.hpp"
67 #include "prims/jvmtiThreadState.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/fieldDescriptor.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/os.hpp"
73 #include "runtime/perfData.hpp"
74 #include "runtime/reflection.hpp"
75 #include "runtime/safepointVerifiers.hpp"
76 #include "runtime/signature.hpp"
77 #include "runtime/timer.hpp"
78 #include "services/classLoadingService.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/bitMap.inline.hpp"
82 #include "utilities/checkedCast.hpp"
83 #include "utilities/copy.hpp"
84 #include "utilities/exceptions.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/globalDefinitions.hpp"
87 #include "utilities/growableArray.hpp"
88 #include "utilities/hashTable.hpp"
89 #include "utilities/macros.hpp"
90 #include "utilities/ostream.hpp"
91 #include "utilities/stringUtils.hpp"
92 #include "utilities/utf8.hpp"
93
94 // We generally try to create the oops directly when parsing, rather than
95 // allocating temporary data structures and copying the bytes twice. A
96 // temporary area is only needed when parsing utf8 entries in the constant
97 // pool and when parsing line number tables.
98
99 // We add assert in debug mode when class format is not checked.
100
101 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
102 #define JAVA_MIN_SUPPORTED_VERSION 45
103 #define JAVA_PREVIEW_MINOR_VERSION 65535
104
105 // Used for two backward compatibility reasons:
106 // - to check for new additions to the class file format in JDK1.5
107 // - to check for bug fixes in the format checker in JDK1.5
108 #define JAVA_1_5_VERSION 49
109
110 // Used for backward compatibility reasons:
111 // - to check for javac bug fixes that happened after 1.5
112 // - also used as the max version when running in jdk6
113 #define JAVA_6_VERSION 50
114
115 // Used for backward compatibility reasons:
116 // - to disallow argument and require ACC_STATIC for <clinit> methods
117 #define JAVA_7_VERSION 51
118
119 // Extension method support.
120 #define JAVA_8_VERSION 52
121
122 #define JAVA_9_VERSION 53
123
124 #define JAVA_10_VERSION 54
125
126 #define JAVA_11_VERSION 55
127
128 #define JAVA_12_VERSION 56
129
130 #define JAVA_13_VERSION 57
131
132 #define JAVA_14_VERSION 58
133
134 #define JAVA_15_VERSION 59
135
136 #define JAVA_16_VERSION 60
137
138 #define JAVA_17_VERSION 61
139
140 #define JAVA_18_VERSION 62
141
142 #define JAVA_19_VERSION 63
143
144 #define JAVA_20_VERSION 64
145
146 #define JAVA_21_VERSION 65
147
148 #define JAVA_22_VERSION 66
149
150 #define JAVA_23_VERSION 67
151
152 #define JAVA_24_VERSION 68
153
154 #define JAVA_25_VERSION 69
155
156 #define JAVA_26_VERSION 70
157
158 #define JAVA_27_VERSION 71
159
160 #define JAVA_28_VERSION 72
161
162 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
163 assert((bad_constant == JVM_CONSTANT_Module ||
164 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
165 "Unexpected bad constant pool entry");
166 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
167 }
168
169 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
170 ConstantPool* cp,
171 const int length,
172 TRAPS) {
173 assert(stream != nullptr, "invariant");
174 assert(cp != nullptr, "invariant");
175
176 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
177 // this function (_current can be allocated in a register, with scalar
178 // replacement of aggregates). The _current pointer is copied back to
179 // stream() when this function returns. DON'T call another method within
180 // this method that uses stream().
181 const ClassFileStream cfs1 = *stream;
182 const ClassFileStream* const cfs = &cfs1;
183
184 DEBUG_ONLY(const u1* const old_current = stream->current();)
185
186 // Used for batching symbol allocations.
187 const char* names[SymbolTable::symbol_alloc_batch_size];
188 int lengths[SymbolTable::symbol_alloc_batch_size];
189 int indices[SymbolTable::symbol_alloc_batch_size];
190 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
191 int names_count = 0;
192
193 // parsing Index 0 is unused
194 for (int index = 1; index < length; index++) {
195 // Each of the following case guarantees one more byte in the stream
196 // for the following tag or the access_flags following constant pool,
197 // so we don't need bounds-check for reading tag.
198 const u1 tag = cfs->get_u1_fast();
199 switch (tag) {
200 case JVM_CONSTANT_Class: {
201 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
202 const u2 name_index = cfs->get_u2_fast();
203 cp->klass_index_at_put(index, name_index);
204 break;
205 }
206 case JVM_CONSTANT_Fieldref: {
207 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
208 const u2 class_index = cfs->get_u2_fast();
209 const u2 name_and_type_index = cfs->get_u2_fast();
210 cp->field_at_put(index, class_index, name_and_type_index);
211 break;
212 }
213 case JVM_CONSTANT_Methodref: {
214 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
215 const u2 class_index = cfs->get_u2_fast();
216 const u2 name_and_type_index = cfs->get_u2_fast();
217 cp->method_at_put(index, class_index, name_and_type_index);
218 break;
219 }
220 case JVM_CONSTANT_InterfaceMethodref: {
221 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
222 const u2 class_index = cfs->get_u2_fast();
223 const u2 name_and_type_index = cfs->get_u2_fast();
224 cp->interface_method_at_put(index, class_index, name_and_type_index);
225 break;
226 }
227 case JVM_CONSTANT_String : {
228 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
229 const u2 string_index = cfs->get_u2_fast();
230 cp->string_index_at_put(index, string_index);
231 break;
232 }
233 case JVM_CONSTANT_MethodHandle :
234 case JVM_CONSTANT_MethodType: {
235 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
236 classfile_parse_error(
237 "Class file version does not support constant tag %u in class file %s",
238 tag, THREAD);
239 return;
240 }
241 if (tag == JVM_CONSTANT_MethodHandle) {
242 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
243 const u1 ref_kind = cfs->get_u1_fast();
244 const u2 method_index = cfs->get_u2_fast();
245 cp->method_handle_index_at_put(index, ref_kind, method_index);
246 }
247 else if (tag == JVM_CONSTANT_MethodType) {
248 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
249 const u2 signature_index = cfs->get_u2_fast();
250 cp->method_type_index_at_put(index, signature_index);
251 }
252 else {
253 ShouldNotReachHere();
254 }
255 break;
256 }
257 case JVM_CONSTANT_Dynamic : {
258 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
259 classfile_parse_error(
260 "Class file version does not support constant tag %u in class file %s",
261 tag, THREAD);
262 return;
263 }
264 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
265 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
266 const u2 name_and_type_index = cfs->get_u2_fast();
267 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
268 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
269 }
270 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
271 break;
272 }
273 case JVM_CONSTANT_InvokeDynamic : {
274 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
275 classfile_parse_error(
276 "Class file version does not support constant tag %u in class file %s",
277 tag, THREAD);
278 return;
279 }
280 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
281 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
282 const u2 name_and_type_index = cfs->get_u2_fast();
283 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
284 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
285 }
286 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
287 break;
288 }
289 case JVM_CONSTANT_Integer: {
290 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
291 const u4 bytes = cfs->get_u4_fast();
292 cp->int_at_put(index, (jint)bytes);
293 break;
294 }
295 case JVM_CONSTANT_Float: {
296 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
297 const u4 bytes = cfs->get_u4_fast();
298 cp->float_at_put(index, *(jfloat*)&bytes);
299 break;
300 }
301 case JVM_CONSTANT_Long: {
302 // A mangled type might cause you to overrun allocated memory
303 guarantee_property(index + 1 < length,
304 "Invalid constant pool entry %u in class file %s",
305 index,
306 CHECK);
307 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
308 const u8 bytes = cfs->get_u8_fast();
309 cp->long_at_put(index, bytes);
310 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
311 break;
312 }
313 case JVM_CONSTANT_Double: {
314 // A mangled type might cause you to overrun allocated memory
315 guarantee_property(index+1 < length,
316 "Invalid constant pool entry %u in class file %s",
317 index,
318 CHECK);
319 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
320 const u8 bytes = cfs->get_u8_fast();
321 cp->double_at_put(index, *(jdouble*)&bytes);
322 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
323 break;
324 }
325 case JVM_CONSTANT_NameAndType: {
326 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
327 const u2 name_index = cfs->get_u2_fast();
328 const u2 signature_index = cfs->get_u2_fast();
329 cp->name_and_type_at_put(index, name_index, signature_index);
330 break;
331 }
332 case JVM_CONSTANT_Utf8 : {
333 cfs->guarantee_more(2, CHECK); // utf8_length
334 u2 utf8_length = cfs->get_u2_fast();
335 const u1* utf8_buffer = cfs->current();
336 assert(utf8_buffer != nullptr, "null utf8 buffer");
337 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
338 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
339 cfs->skip_u1_fast(utf8_length);
340
341 // Before storing the symbol, make sure it's legal
342 if (_need_verify) {
343 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
344 }
345
346 unsigned int hash;
347 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
348 utf8_length,
349 hash);
350 if (result == nullptr) {
351 names[names_count] = (const char*)utf8_buffer;
352 lengths[names_count] = utf8_length;
353 indices[names_count] = index;
354 hashValues[names_count++] = hash;
355 if (names_count == SymbolTable::symbol_alloc_batch_size) {
356 SymbolTable::new_symbols(_loader_data,
357 constantPoolHandle(THREAD, cp),
358 names_count,
359 names,
360 lengths,
361 indices,
362 hashValues);
363 names_count = 0;
364 }
365 } else {
366 cp->symbol_at_put(index, result);
367 }
368 break;
369 }
370 case JVM_CONSTANT_Module:
371 case JVM_CONSTANT_Package: {
372 // Record that an error occurred in these two cases but keep parsing so
373 // that ACC_Module can be checked for in the access_flags. Need to
374 // throw NoClassDefFoundError in that case.
375 if (_major_version >= JAVA_9_VERSION) {
376 cfs->guarantee_more(3, CHECK);
377 cfs->get_u2_fast();
378 set_class_bad_constant_seen(tag);
379 break;
380 }
381 }
382 default: {
383 classfile_parse_error("Unknown constant tag %u in class file %s",
384 tag,
385 THREAD);
386 return;
387 }
388 } // end of switch(tag)
389 } // end of for
390
391 // Allocate the remaining symbols
392 if (names_count > 0) {
393 SymbolTable::new_symbols(_loader_data,
394 constantPoolHandle(THREAD, cp),
395 names_count,
396 names,
397 lengths,
398 indices,
399 hashValues);
400 }
401
402 // Copy _current pointer of local copy back to stream.
403 assert(stream->current() == old_current, "non-exclusive use of stream");
404 stream->set_current(cfs1.current());
405
406 }
407
408 static inline bool valid_cp_range(int index, int length) {
409 return (index > 0 && index < length);
410 }
411
412 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
413 assert(cp != nullptr, "invariant");
414 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
415 return cp->symbol_at(index);
416 }
417 return nullptr;
418 }
419
420 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
421 ConstantPool* const cp,
422 const int length,
423 TRAPS) {
424 assert(cp != nullptr, "invariant");
425 assert(stream != nullptr, "invariant");
426
427 // parsing constant pool entries
428 parse_constant_pool_entries(stream, cp, length, CHECK);
429 if (class_bad_constant_seen() != 0) {
430 // a bad CP entry has been detected previously so stop parsing and just return.
431 return;
432 }
433
434 int index = 1; // declared outside of loops for portability
435 int num_klasses = 0;
436
437 // first verification pass - validate cross references
438 // and fixup class and string constants
439 for (index = 1; index < length; index++) { // Index 0 is unused
440 const jbyte tag = cp->tag_at(index).value();
441 switch (tag) {
442 case JVM_CONSTANT_Class: {
443 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
444 break;
445 }
446 case JVM_CONSTANT_Fieldref:
447 // fall through
448 case JVM_CONSTANT_Methodref:
449 // fall through
450 case JVM_CONSTANT_InterfaceMethodref: {
451 if (!_need_verify) break;
452 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
453 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
454 guarantee_property(valid_klass_reference_at(klass_ref_index),
455 "Invalid constant pool index %u in class file %s",
456 klass_ref_index, CHECK);
457 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
458 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
459 "Invalid constant pool index %u in class file %s",
460 name_and_type_ref_index, CHECK);
461 break;
462 }
463 case JVM_CONSTANT_String: {
464 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
465 break;
466 }
467 case JVM_CONSTANT_Integer:
468 break;
469 case JVM_CONSTANT_Float:
470 break;
471 case JVM_CONSTANT_Long:
472 case JVM_CONSTANT_Double: {
473 index++;
474 guarantee_property(
475 (index < length && cp->tag_at(index).is_invalid()),
476 "Improper constant pool long/double index %u in class file %s",
477 index, CHECK);
478 break;
479 }
480 case JVM_CONSTANT_NameAndType: {
481 if (!_need_verify) break;
482 const int name_ref_index = cp->name_ref_index_at(index);
483 const int signature_ref_index = cp->signature_ref_index_at(index);
484 guarantee_property(valid_symbol_at(name_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 name_ref_index, CHECK);
487 guarantee_property(valid_symbol_at(signature_ref_index),
488 "Invalid constant pool index %u in class file %s",
489 signature_ref_index, CHECK);
490 break;
491 }
492 case JVM_CONSTANT_Utf8:
493 break;
494 case JVM_CONSTANT_UnresolvedClass: // fall-through
495 case JVM_CONSTANT_UnresolvedClassInError: {
496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
497 break;
498 }
499 case JVM_CONSTANT_ClassIndex: {
500 const int class_index = cp->klass_index_at(index);
501 guarantee_property(valid_symbol_at(class_index),
502 "Invalid constant pool index %u in class file %s",
503 class_index, CHECK);
504
505 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
506 break;
507 }
508 case JVM_CONSTANT_StringIndex: {
509 const int string_index = cp->string_index_at(index);
510 guarantee_property(valid_symbol_at(string_index),
511 "Invalid constant pool index %u in class file %s",
512 string_index, CHECK);
513 Symbol* const sym = cp->symbol_at(string_index);
514 cp->unresolved_string_at_put(index, sym);
515 break;
516 }
517 case JVM_CONSTANT_MethodHandle: {
518 const int ref_index = cp->method_handle_index_at(index);
519 guarantee_property(valid_cp_range(ref_index, length),
520 "Invalid constant pool index %u in class file %s",
521 ref_index, CHECK);
522 const constantTag tag = cp->tag_at(ref_index);
523 const int ref_kind = cp->method_handle_ref_kind_at(index);
524
525 switch (ref_kind) {
526 case JVM_REF_getField:
527 case JVM_REF_getStatic:
528 case JVM_REF_putField:
529 case JVM_REF_putStatic: {
530 guarantee_property(
531 tag.is_field(),
532 "Invalid constant pool index %u in class file %s (not a field)",
533 ref_index, CHECK);
534 break;
535 }
536 case JVM_REF_invokeVirtual:
537 case JVM_REF_newInvokeSpecial: {
538 guarantee_property(
539 tag.is_method(),
540 "Invalid constant pool index %u in class file %s (not a method)",
541 ref_index, CHECK);
542 break;
543 }
544 case JVM_REF_invokeStatic:
545 case JVM_REF_invokeSpecial: {
546 guarantee_property(
547 tag.is_method() ||
548 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
549 "Invalid constant pool index %u in class file %s (not a method)",
550 ref_index, CHECK);
551 break;
552 }
553 case JVM_REF_invokeInterface: {
554 guarantee_property(
555 tag.is_interface_method(),
556 "Invalid constant pool index %u in class file %s (not an interface method)",
557 ref_index, CHECK);
558 break;
559 }
560 default: {
561 classfile_parse_error(
562 "Bad method handle kind at constant pool index %u in class file %s",
563 index, THREAD);
564 return;
565 }
566 } // switch(refkind)
567 // Keep the ref_index unchanged. It will be indirected at link-time.
568 break;
569 } // case MethodHandle
570 case JVM_CONSTANT_MethodType: {
571 const int ref_index = cp->method_type_index_at(index);
572 guarantee_property(valid_symbol_at(ref_index),
573 "Invalid constant pool index %u in class file %s",
574 ref_index, CHECK);
575 break;
576 }
577 case JVM_CONSTANT_Dynamic: {
578 const int name_and_type_ref_index =
579 cp->bootstrap_name_and_type_ref_index_at(index);
580
581 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
582 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
583 "Invalid constant pool index %u in class file %s",
584 name_and_type_ref_index, CHECK);
585 // bootstrap specifier index must be checked later,
586 // when BootstrapMethods attr is available
587
588 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
589 cp->set_has_dynamic_constant();
590 break;
591 }
592 case JVM_CONSTANT_InvokeDynamic: {
593 const int name_and_type_ref_index =
594 cp->bootstrap_name_and_type_ref_index_at(index);
595
596 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
597 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
598 "Invalid constant pool index %u in class file %s",
599 name_and_type_ref_index, CHECK);
600 // bootstrap specifier index must be checked later,
601 // when BootstrapMethods attr is available
602 break;
603 }
604 default: {
605 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
606 ShouldNotReachHere();
607 break;
608 }
609 } // switch(tag)
610 } // end of for
611
612 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
613
614 if (!_need_verify) {
615 return;
616 }
617
618 // second verification pass - checks the strings are of the right format.
619 // but not yet to the other entries
620 for (index = 1; index < length; index++) {
621 const jbyte tag = cp->tag_at(index).value();
622 switch (tag) {
623 case JVM_CONSTANT_UnresolvedClass: {
624 const Symbol* const class_name = cp->klass_name_at(index);
625 // check the name
626 verify_legal_class_name(class_name, CHECK);
627 break;
628 }
629 case JVM_CONSTANT_NameAndType: {
630 if (_need_verify) {
631 const int sig_index = cp->signature_ref_index_at(index);
632 const int name_index = cp->name_ref_index_at(index);
633 const Symbol* const name = cp->symbol_at(name_index);
634 const Symbol* const sig = cp->symbol_at(sig_index);
635 guarantee_property(sig->utf8_length() != 0,
636 "Illegal zero length constant pool entry at %d in class %s",
637 sig_index, CHECK);
638 guarantee_property(name->utf8_length() != 0,
639 "Illegal zero length constant pool entry at %d in class %s",
640 name_index, CHECK);
641
642 if (Signature::is_method(sig)) {
643 // Format check method name and signature
644 verify_legal_method_name(name, CHECK);
645 verify_legal_method_signature(name, sig, CHECK);
646 } else {
647 // Format check field name and signature
648 verify_legal_field_name(name, CHECK);
649 verify_legal_field_signature(name, sig, CHECK);
650 }
651 }
652 break;
653 }
654 case JVM_CONSTANT_Dynamic: {
655 const int name_and_type_ref_index =
656 cp->uncached_name_and_type_ref_index_at(index);
657 // already verified to be utf8
658 const int name_ref_index =
659 cp->name_ref_index_at(name_and_type_ref_index);
660 // already verified to be utf8
661 const int signature_ref_index =
662 cp->signature_ref_index_at(name_and_type_ref_index);
663 const Symbol* const name = cp->symbol_at(name_ref_index);
664 const Symbol* const signature = cp->symbol_at(signature_ref_index);
665 if (_need_verify) {
666 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
667 // Need only to be sure signature is the right type.
668 if (Signature::is_method(signature)) {
669 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
670 }
671 }
672 break;
673 }
674 case JVM_CONSTANT_InvokeDynamic:
675 case JVM_CONSTANT_Fieldref:
676 case JVM_CONSTANT_Methodref:
677 case JVM_CONSTANT_InterfaceMethodref: {
678 const int name_and_type_ref_index =
679 cp->uncached_name_and_type_ref_index_at(index);
680 // already verified to be utf8
681 const int name_ref_index =
682 cp->name_ref_index_at(name_and_type_ref_index);
683 // already verified to be utf8
684 const int signature_ref_index =
685 cp->signature_ref_index_at(name_and_type_ref_index);
686 const Symbol* const name = cp->symbol_at(name_ref_index);
687 const Symbol* const signature = cp->symbol_at(signature_ref_index);
688 if (tag == JVM_CONSTANT_Fieldref) {
689 if (_need_verify) {
690 // Field name and signature are verified above, when iterating NameAndType_info.
691 // Need only to be sure signature is non-zero length and the right type.
692 if (Signature::is_method(signature)) {
693 throwIllegalSignature("Field", name, signature, CHECK);
694 }
695 }
696 } else {
697 if (_need_verify) {
698 // Method name and signature are individually verified above, when iterating
699 // NameAndType_info. Need to check here that signature is non-zero length and
700 // the right type.
701 if (!Signature::is_method(signature)) {
702 throwIllegalSignature("Method", name, signature, CHECK);
703 }
704 }
705 // If a class method name begins with '<', it must be "<init>" and have void signature.
706 const unsigned int name_len = name->utf8_length();
707 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
708 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
709 if (name != vmSymbols::object_initializer_name()) {
710 classfile_parse_error(
711 "Bad method name at constant pool index %u in class file %s",
712 name_ref_index, THREAD);
713 return;
714 } else if (!Signature::is_void_method(signature)) { // must have void signature.
715 throwIllegalSignature("Method", name, signature, CHECK);
716 }
717 }
718 }
719 break;
720 }
721 case JVM_CONSTANT_MethodHandle: {
722 const int ref_index = cp->method_handle_index_at(index);
723 const int ref_kind = cp->method_handle_ref_kind_at(index);
724 switch (ref_kind) {
725 case JVM_REF_invokeVirtual:
726 case JVM_REF_invokeStatic:
727 case JVM_REF_invokeSpecial:
728 case JVM_REF_newInvokeSpecial: {
729 const int name_and_type_ref_index =
730 cp->uncached_name_and_type_ref_index_at(ref_index);
731 const int name_ref_index =
732 cp->name_ref_index_at(name_and_type_ref_index);
733 const Symbol* const name = cp->symbol_at(name_ref_index);
734 if (ref_kind == JVM_REF_newInvokeSpecial) {
735 if (name != vmSymbols::object_initializer_name()) {
736 classfile_parse_error(
737 "Bad constructor name at constant pool index %u in class file %s",
738 name_ref_index, THREAD);
739 return;
740 }
741 } else {
742 if (name == vmSymbols::object_initializer_name()) {
743 classfile_parse_error(
744 "Bad method name at constant pool index %u in class file %s",
745 name_ref_index, THREAD);
746 return;
747 }
748 }
749 break;
750 }
751 // Other ref_kinds are already fully checked in previous pass.
752 } // switch(ref_kind)
753 break;
754 }
755 case JVM_CONSTANT_MethodType: {
756 const Symbol* const no_name = vmSymbols::type_name(); // place holder
757 const Symbol* const signature = cp->method_type_signature_at(index);
758 verify_legal_method_signature(no_name, signature, CHECK);
759 break;
760 }
761 case JVM_CONSTANT_Utf8: {
762 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
763 }
764 } // switch(tag)
765 } // end of for
766 }
767
768 class NameSigHash: public ResourceObj {
769 public:
770 const Symbol* _name; // name
771 const Symbol* _sig; // signature
772
773 static const int HASH_ROW_SIZE = 256;
774
775 NameSigHash(Symbol* name, Symbol* sig) :
776 _name(name),
777 _sig(sig) {}
778
779 static unsigned int hash(NameSigHash const& namesig) {
780 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
781 }
782
783 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
784 return (e0._name == e1._name) &&
785 (e0._sig == e1._sig);
786 }
787 };
788
789 using NameSigHashtable = HashTable<NameSigHash, int,
790 NameSigHash::HASH_ROW_SIZE,
791 AnyObj::RESOURCE_AREA, mtInternal,
792 &NameSigHash::hash, &NameSigHash::equals>;
793
794 // Side-effects: populates the _local_interfaces field
795 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
796 const int itfs_len,
797 ConstantPool* const cp,
798 bool* const has_nonstatic_concrete_methods,
799 TRAPS) {
800 assert(stream != nullptr, "invariant");
801 assert(cp != nullptr, "invariant");
802 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
803
804 if (itfs_len == 0) {
805 _local_interfaces = Universe::the_empty_instance_klass_array();
806 } else {
807 assert(itfs_len > 0, "only called for len>0");
808 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
809
810 int index;
811 for (index = 0; index < itfs_len; index++) {
812 const u2 interface_index = stream->get_u2(CHECK);
813 Klass* interf;
814 guarantee_property(
815 valid_klass_reference_at(interface_index),
816 "Interface name has bad constant pool index %u in class file %s",
817 interface_index, CHECK);
818 if (cp->tag_at(interface_index).is_klass()) {
819 interf = cp->resolved_klass_at(interface_index);
820 } else {
821 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
822
823 // Don't need to check legal name because it's checked when parsing constant pool.
824 // But need to make sure it's not an array type.
825 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
826 "Bad interface name in class file %s", CHECK);
827
828 // Call resolve on the interface class name with class circularity checking
829 interf = SystemDictionary::resolve_super_or_fail(_class_name,
830 unresolved_klass,
831 Handle(THREAD, _loader_data->class_loader()),
832 false, CHECK);
833 }
834
835 if (!interf->is_interface()) {
836 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
837 err_msg("class %s can not implement %s, because it is not an interface (%s)",
838 _class_name->as_klass_external_name(),
839 interf->external_name(),
840 interf->class_in_module_of_loader()));
841 }
842
843 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
844 *has_nonstatic_concrete_methods = true;
845 }
846 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
847 }
848
849 if (!_need_verify || itfs_len <= 1) {
850 return;
851 }
852
853 // Check if there's any duplicates in interfaces
854 ResourceMark rm(THREAD);
855 // Set containing interface names
856 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
857 for (index = 0; index < itfs_len; index++) {
858 const InstanceKlass* const k = _local_interfaces->at(index);
859 Symbol* interface_name = k->name();
860 // If no duplicates, add (name, nullptr) in hashtable interface_names.
861 if (!interface_names->put(interface_name, 0)) {
862 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
863 interface_name->as_C_string(), THREAD);
864 return;
865 }
866 }
867 }
868 }
869
870 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
871 int constantvalue_index,
872 int signature_index,
873 TRAPS) const {
874 // Make sure the constant pool entry is of a type appropriate to this field
875 guarantee_property(
876 (constantvalue_index > 0 &&
877 constantvalue_index < cp->length()),
878 "Bad initial value index %u in ConstantValue attribute in class file %s",
879 constantvalue_index, CHECK);
880
881 const constantTag value_type = cp->tag_at(constantvalue_index);
882 switch(cp->basic_type_for_signature_at(signature_index)) {
883 case T_LONG: {
884 guarantee_property(value_type.is_long(),
885 "Inconsistent constant value type in class file %s",
886 CHECK);
887 break;
888 }
889 case T_FLOAT: {
890 guarantee_property(value_type.is_float(),
891 "Inconsistent constant value type in class file %s",
892 CHECK);
893 break;
894 }
895 case T_DOUBLE: {
896 guarantee_property(value_type.is_double(),
897 "Inconsistent constant value type in class file %s",
898 CHECK);
899 break;
900 }
901 case T_BYTE:
902 case T_CHAR:
903 case T_SHORT:
904 case T_BOOLEAN:
905 case T_INT: {
906 guarantee_property(value_type.is_int(),
907 "Inconsistent constant value type in class file %s",
908 CHECK);
909 break;
910 }
911 case T_OBJECT: {
912 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
913 && value_type.is_string()),
914 "Bad string initial value in class file %s",
915 CHECK);
916 break;
917 }
918 default: {
919 classfile_parse_error("Unable to set initial value %u in class file %s",
920 constantvalue_index,
921 THREAD);
922 }
923 }
924 }
925
926 class AnnotationCollector : public ResourceObj{
927 public:
928 enum Location { _in_field, _in_method, _in_class };
929 enum ID {
930 _unknown = 0,
931 _method_CallerSensitive,
932 _method_ForceInline,
933 _method_DontInline,
934 _method_ChangesCurrentThread,
935 _method_JvmtiHideEvents,
936 _method_JvmtiMountTransition,
937 _method_InjectedProfile,
938 _method_LambdaForm_Compiled,
939 _method_Hidden,
940 _method_Scoped,
941 _method_IntrinsicCandidate,
942 _jdk_internal_vm_annotation_Contended,
943 _field_Stable,
944 _jdk_internal_vm_annotation_ReservedStackAccess,
945 _jdk_internal_ValueBased,
946 _jdk_internal_LooselyConsistentValue,
947 _jdk_internal_NullRestricted,
948 _java_lang_Deprecated,
949 _java_lang_Deprecated_for_removal,
950 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
951 _method_AOTRuntimeSetup,
952 _jdk_internal_vm_annotation_TrustFinalFields,
953 _annotation_LIMIT
954 };
955 const Location _location;
956 int _annotations_present;
957 u2 _contended_group;
958
959 AnnotationCollector(Location location)
960 : _location(location), _annotations_present(0), _contended_group(0)
961 {
962 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
963 }
964 // If this annotation name has an ID, report it (or _none).
965 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
966 // Set the annotation name:
967 void set_annotation(ID id) {
968 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
969 _annotations_present |= (int)nth_bit((int)id);
970 }
971
972 void remove_annotation(ID id) {
973 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
974 _annotations_present &= (int)~nth_bit((int)id);
975 }
976
977 // Report if the annotation is present.
978 bool has_any_annotations() const { return _annotations_present != 0; }
979 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
980
981 void set_contended_group(u2 group) { _contended_group = group; }
982 u2 contended_group() const { return _contended_group; }
983
984 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
985
986 void set_stable(bool stable) { set_annotation(_field_Stable); }
987 bool is_stable() const { return has_annotation(_field_Stable); }
988
989 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); }
990 };
991
992 // This class also doubles as a holder for metadata cleanup.
993 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
994 private:
995 ClassLoaderData* _loader_data;
996 AnnotationArray* _field_annotations;
997 AnnotationArray* _field_type_annotations;
998 public:
999 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1000 AnnotationCollector(_in_field),
1001 _loader_data(loader_data),
1002 _field_annotations(nullptr),
1003 _field_type_annotations(nullptr) {}
1004 ~FieldAnnotationCollector();
1005 void apply_to(FieldInfo* f);
1006 AnnotationArray* field_annotations() { return _field_annotations; }
1007 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1008
1009 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1010 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1011 };
1012
1013 class MethodAnnotationCollector : public AnnotationCollector{
1014 public:
1015 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1016 void apply_to(const methodHandle& m);
1017 };
1018
1019 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1020 public:
1021 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1022 void apply_to(InstanceKlass* ik);
1023 };
1024
1025
1026 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth); // fwd decl
1027 static const int max_recursion_depth = 5;
1028
1029 // Safely increment index by val if does not pass limit
1030 #define SAFE_ADD(index, limit, val) \
1031 if (index >= limit - val) return limit; \
1032 index += val;
1033
1034 // Skip an annotation. Return >=limit if there is any problem.
1035 static int skip_annotation(const u1* buffer, int limit, int index, int recursion_depth = 0) {
1036 assert(buffer != nullptr, "invariant");
1037 if (recursion_depth > max_recursion_depth) {
1038 return limit;
1039 }
1040 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1041 // value := switch (tag:u1) { ... }
1042 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1043 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1044 while (--nmem >= 0 && index < limit) {
1045 SAFE_ADD(index, limit, 2); // skip member
1046 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1047 }
1048 return index;
1049 }
1050
1051 // Skip an annotation value. Return >=limit if there is any problem.
1052 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth) {
1053 assert(buffer != nullptr, "invariant");
1054
1055 if (recursion_depth > max_recursion_depth) {
1056 return limit;
1057 }
1058 // value := switch (tag:u1) {
1059 // case B, C, I, S, Z, D, F, J, c: con:u2;
1060 // case e: e_class:u2 e_name:u2;
1061 // case s: s_con:u2;
1062 // case [: do(nval:u2) {value};
1063 // case @: annotation;
1064 // case s: s_con:u2;
1065 // }
1066 SAFE_ADD(index, limit, 1); // read tag
1067 const u1 tag = buffer[index - 1];
1068 switch (tag) {
1069 case 'B':
1070 case 'C':
1071 case 'I':
1072 case 'S':
1073 case 'Z':
1074 case 'D':
1075 case 'F':
1076 case 'J':
1077 case 'c':
1078 case 's':
1079 SAFE_ADD(index, limit, 2); // skip con or s_con
1080 break;
1081 case 'e':
1082 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1083 break;
1084 case '[':
1085 {
1086 SAFE_ADD(index, limit, 2); // read nval
1087 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1088 while (--nval >= 0 && index < limit) {
1089 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1090 }
1091 }
1092 break;
1093 case '@':
1094 index = skip_annotation(buffer, limit, index, recursion_depth + 1);
1095 break;
1096 default:
1097 return limit; // bad tag byte
1098 }
1099 return index;
1100 }
1101
1102 // Sift through annotations, looking for those significant to the VM:
1103 static void parse_annotations(const ConstantPool* const cp,
1104 const u1* buffer, int limit,
1105 AnnotationCollector* coll,
1106 ClassLoaderData* loader_data,
1107 const bool can_access_vm_annotations) {
1108
1109 assert(cp != nullptr, "invariant");
1110 assert(buffer != nullptr, "invariant");
1111 assert(coll != nullptr, "invariant");
1112 assert(loader_data != nullptr, "invariant");
1113
1114 // annotations := do(nann:u2) {annotation}
1115 int index = 2; // read nann
1116 if (index >= limit) return;
1117 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1118 enum { // initial annotation layout
1119 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1120 count_off = 2, // u2 such as 1 (one value)
1121 member_off = 4, // utf8 such as 'value'
1122 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1123 e_tag_val = 'e',
1124 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1125 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1126 e_size = 11, // end of 'e' annotation
1127 c_tag_val = 'c', // payload is type
1128 c_con_off = 7, // utf8 payload, such as 'I'
1129 c_size = 9, // end of 'c' annotation
1130 s_tag_val = 's', // payload is String
1131 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1132 s_size = 9,
1133 b_tag_val = 'Z', // payload is boolean
1134 min_size = 6 // smallest possible size (zero members)
1135 };
1136 // Cannot add min_size to index in case of overflow MAX_INT
1137 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1138 int index0 = index;
1139 index = skip_annotation(buffer, limit, index);
1140 const u1* const abase = buffer + index0;
1141 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1142 const int count = Bytes::get_Java_u2((address)abase + count_off);
1143 const Symbol* const aname = check_symbol_at(cp, atype);
1144 if (aname == nullptr) break; // invalid annotation name
1145 const Symbol* member = nullptr;
1146 if (count >= 1) {
1147 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1148 member = check_symbol_at(cp, member_index);
1149 if (member == nullptr) break; // invalid member name
1150 }
1151
1152 // Here is where parsing particular annotations will take place.
1153 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1154 if (AnnotationCollector::_unknown == id) continue;
1155 coll->set_annotation(id);
1156 if (AnnotationCollector::_java_lang_Deprecated == id) {
1157 // @Deprecated can specify forRemoval=true, which we need
1158 // to record for JFR to use. If the annotation is not well-formed
1159 // then we may not be able to determine that.
1160 const u1* offset = abase + member_off;
1161 // There are only 2 members in @Deprecated.
1162 int n_members = MIN2(count, 2);
1163 for (int i = 0; i < n_members; ++i) {
1164 int member_index = Bytes::get_Java_u2((address)offset);
1165 offset += 2;
1166 member = check_symbol_at(cp, member_index);
1167 if (member == vmSymbols::since() &&
1168 (*((address)offset) == s_tag_val)) {
1169 // Found `since` first so skip over it
1170 offset += 3;
1171 }
1172 else if (member == vmSymbols::for_removal() &&
1173 (*((address)offset) == b_tag_val)) {
1174 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1175 // No guarantee the entry is valid so check it refers to an int in the CP.
1176 if (cp->is_within_bounds(boolean_value_index) &&
1177 cp->tag_at(boolean_value_index).is_int() &&
1178 cp->int_at(boolean_value_index) == 1) {
1179 // forRemoval == true
1180 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1181 }
1182 break; // no need to check further
1183 }
1184 else {
1185 // This @Deprecated annotation is malformed so we don't try to
1186 // determine whether forRemoval is set.
1187 break;
1188 }
1189 }
1190 continue; // proceed to next annotation
1191 }
1192
1193 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1194 // @Contended can optionally specify the contention group.
1195 //
1196 // Contended group defines the equivalence class over the fields:
1197 // the fields within the same contended group are not treated distinct.
1198 // The only exception is default group, which does not incur the
1199 // equivalence. Naturally, contention group for classes is meaningless.
1200 //
1201 // While the contention group is specified as String, annotation
1202 // values are already interned, and we might as well use the constant
1203 // pool index as the group tag.
1204 //
1205 u2 group_index = 0; // default contended group
1206 if (count == 1
1207 && s_size == (index - index0) // match size
1208 && s_tag_val == *(abase + tag_off)
1209 && member == vmSymbols::value_name()) {
1210 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1211 // No guarantee the group_index is valid so check it refers to a
1212 // symbol in the CP.
1213 if (cp->is_within_bounds(group_index) &&
1214 cp->tag_at(group_index).is_utf8()) {
1215 // Seems valid, so check for empty string and reset
1216 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1217 group_index = 0; // default contended group
1218 }
1219 } else {
1220 // Not valid so use the default
1221 group_index = 0;
1222 }
1223 }
1224 coll->set_contended_group(group_index);
1225 continue; // proceed to next annotation
1226 }
1227 }
1228 }
1229
1230
1231 // Parse attributes for a field.
1232 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1233 u2 attributes_count,
1234 bool is_static, u2 signature_index,
1235 u2* const constantvalue_index_addr,
1236 bool* const is_synthetic_addr,
1237 u2* const generic_signature_index_addr,
1238 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1239 TRAPS) {
1240 assert(cfs != nullptr, "invariant");
1241 assert(constantvalue_index_addr != nullptr, "invariant");
1242 assert(is_synthetic_addr != nullptr, "invariant");
1243 assert(generic_signature_index_addr != nullptr, "invariant");
1244 assert(parsed_annotations != nullptr, "invariant");
1245 assert(attributes_count > 0, "attributes_count should be greater than 0");
1246
1247 u2 constantvalue_index = 0;
1248 u2 generic_signature_index = 0;
1249 bool is_synthetic = false;
1250 const u1* runtime_visible_annotations = nullptr;
1251 int runtime_visible_annotations_length = 0;
1252 const u1* runtime_visible_type_annotations = nullptr;
1253 int runtime_visible_type_annotations_length = 0;
1254 bool runtime_invisible_annotations_exists = false;
1255 bool runtime_invisible_type_annotations_exists = false;
1256 const ConstantPool* const cp = _cp;
1257
1258 while (attributes_count--) {
1259 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1260 const u2 attribute_name_index = cfs->get_u2_fast();
1261 const u4 attribute_length = cfs->get_u4_fast();
1262 guarantee_property(valid_symbol_at(attribute_name_index),
1263 "Invalid field attribute index %u in class file %s",
1264 attribute_name_index,
1265 CHECK);
1266
1267 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1268 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1269 // ignore if non-static
1270 if (constantvalue_index != 0) {
1271 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1272 return;
1273 }
1274 guarantee_property(
1275 attribute_length == 2,
1276 "Invalid ConstantValue field attribute length %u in class file %s",
1277 attribute_length, CHECK);
1278
1279 constantvalue_index = cfs->get_u2(CHECK);
1280 if (_need_verify) {
1281 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1282 }
1283 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1284 if (attribute_length != 0) {
1285 classfile_parse_error(
1286 "Invalid Synthetic field attribute length %u in class file %s",
1287 attribute_length, THREAD);
1288 return;
1289 }
1290 is_synthetic = true;
1291 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1292 if (attribute_length != 0) {
1293 classfile_parse_error(
1294 "Invalid Deprecated field attribute length %u in class file %s",
1295 attribute_length, THREAD);
1296 return;
1297 }
1298 } else if (_major_version >= JAVA_1_5_VERSION) {
1299 if (attribute_name == vmSymbols::tag_signature()) {
1300 if (generic_signature_index != 0) {
1301 classfile_parse_error(
1302 "Multiple Signature attributes for field in class file %s", THREAD);
1303 return;
1304 }
1305 if (attribute_length != 2) {
1306 classfile_parse_error(
1307 "Wrong size %u for field's Signature attribute in class file %s",
1308 attribute_length, THREAD);
1309 return;
1310 }
1311 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1312 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1313 if (runtime_visible_annotations != nullptr) {
1314 classfile_parse_error(
1315 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1316 return;
1317 }
1318 runtime_visible_annotations_length = attribute_length;
1319 runtime_visible_annotations = cfs->current();
1320 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1321 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1322 parse_annotations(cp,
1323 runtime_visible_annotations,
1324 runtime_visible_annotations_length,
1325 parsed_annotations,
1326 _loader_data,
1327 _can_access_vm_annotations);
1328 cfs->skip_u1_fast(runtime_visible_annotations_length);
1329 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1330 if (runtime_invisible_annotations_exists) {
1331 classfile_parse_error(
1332 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1333 return;
1334 }
1335 runtime_invisible_annotations_exists = true;
1336 cfs->skip_u1(attribute_length, CHECK);
1337 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1338 if (runtime_visible_type_annotations != nullptr) {
1339 classfile_parse_error(
1340 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1341 return;
1342 }
1343 runtime_visible_type_annotations_length = attribute_length;
1344 runtime_visible_type_annotations = cfs->current();
1345 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1346 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1347 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1348 if (runtime_invisible_type_annotations_exists) {
1349 classfile_parse_error(
1350 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1351 return;
1352 } else {
1353 runtime_invisible_type_annotations_exists = true;
1354 }
1355 cfs->skip_u1(attribute_length, CHECK);
1356 } else {
1357 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1358 }
1359 } else {
1360 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1361 }
1362 }
1363
1364 *constantvalue_index_addr = constantvalue_index;
1365 *is_synthetic_addr = is_synthetic;
1366 *generic_signature_index_addr = generic_signature_index;
1367 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1368 runtime_visible_annotations_length,
1369 CHECK);
1370 parsed_annotations->set_field_annotations(a);
1371 a = allocate_annotations(runtime_visible_type_annotations,
1372 runtime_visible_type_annotations_length,
1373 CHECK);
1374 parsed_annotations->set_field_type_annotations(a);
1375 return;
1376 }
1377
1378
1379 // Side-effects: populates the _fields, _fields_annotations,
1380 // _fields_type_annotations fields
1381 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1382 AccessFlags class_access_flags,
1383 ConstantPool* cp,
1384 const int cp_size,
1385 u2* const java_fields_count_ptr,
1386 TRAPS) {
1387
1388 assert(cfs != nullptr, "invariant");
1389 assert(cp != nullptr, "invariant");
1390 assert(java_fields_count_ptr != nullptr, "invariant");
1391
1392 assert(nullptr == _fields_annotations, "invariant");
1393 assert(nullptr == _fields_type_annotations, "invariant");
1394
1395 // "inline type" means concrete value class
1396 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1397 // "value class" can be either abstract or concrete value class
1398 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1399 cfs->guarantee_more(2, CHECK); // length
1400 const u2 length = cfs->get_u2_fast();
1401 *java_fields_count_ptr = length;
1402
1403 int num_injected = 0;
1404 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1405 &num_injected);
1406
1407 // Two more slots are required for inline classes:
1408 // - The static field ".null_reset" which carries the nullable flat layout
1409 // representation of null, added below
1410 // - The nonstatic field ".empty" the JVM injects when detecting an empty
1411 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout
1412 // One more slot is required for both abstract value class and inline classes:
1413 // - The static field ".acmp_maps" for acmp and identity hash, tracks
1414 // nonstatic fields both inherited or declared, added below
1415 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1416 + (is_value_class ? 1 : 0);
1417
1418 // Allocate a temporary resource array to collect field data.
1419 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1420 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1421
1422 ResourceMark rm(THREAD);
1423 for (int n = 0; n < length; n++) {
1424 // access_flags, name_index, descriptor_index, attributes_count
1425 cfs->guarantee_more(8, CHECK);
1426
1427 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1428 if (!supports_inline_types()) {
1429 recognized_modifiers &= ~JVM_ACC_STRICT_INIT;
1430 }
1431
1432 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1433 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1434 AccessFlags access_flags;
1435 access_flags.set_flags(flags);
1436 FieldInfo::FieldFlags fieldFlags(0);
1437
1438 const u2 name_index = cfs->get_u2_fast();
1439 guarantee_property(valid_symbol_at(name_index),
1440 "Invalid constant pool index %u for field name in class file %s",
1441 name_index, CHECK);
1442 const Symbol* const name = cp->symbol_at(name_index);
1443 verify_legal_field_name(name, CHECK);
1444
1445 const u2 signature_index = cfs->get_u2_fast();
1446 guarantee_property(valid_symbol_at(signature_index),
1447 "Invalid constant pool index %u for field signature in class file %s",
1448 signature_index, CHECK);
1449 const Symbol* const sig = cp->symbol_at(signature_index);
1450 verify_legal_field_signature(name, sig, CHECK);
1451
1452 u2 constantvalue_index = 0;
1453 bool is_synthetic = false;
1454 u2 generic_signature_index = 0;
1455 const bool is_static = access_flags.is_static();
1456 FieldAnnotationCollector parsed_annotations(_loader_data);
1457
1458 bool is_null_restricted = false;
1459
1460 const u2 attributes_count = cfs->get_u2_fast();
1461 if (attributes_count > 0) {
1462 parse_field_attributes(cfs,
1463 attributes_count,
1464 is_static,
1465 signature_index,
1466 &constantvalue_index,
1467 &is_synthetic,
1468 &generic_signature_index,
1469 &parsed_annotations,
1470 CHECK);
1471
1472 if (parsed_annotations.field_annotations() != nullptr) {
1473 if (_fields_annotations == nullptr) {
1474 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1475 _loader_data, length, nullptr,
1476 CHECK);
1477 }
1478 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1479 parsed_annotations.set_field_annotations(nullptr);
1480 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1481 if (!Signature::has_envelope(sig)) {
1482 Exceptions::fthrow(
1483 THREAD_AND_LOCATION,
1484 vmSymbols::java_lang_ClassFormatError(),
1485 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1486 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1487 return;
1488 }
1489 if (!supports_inline_types()) {
1490 Exceptions::fthrow(
1491 THREAD_AND_LOCATION,
1492 vmSymbols::java_lang_ClassFormatError(),
1493 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file",
1494 class_name()->as_C_string(), name->as_C_string());
1495 return;
1496 }
1497
1498 if ((flags & JVM_ACC_STRICT_INIT) == 0) {
1499 // Inject STRICT_INIT and validate in context
1500 const jint patched_flags = flags | JVM_ACC_STRICT_INIT;
1501 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK);
1502 access_flags.set_flags(patched_flags);
1503 }
1504 is_null_restricted = true;
1505 }
1506 }
1507 if (parsed_annotations.field_type_annotations() != nullptr) {
1508 if (_fields_type_annotations == nullptr) {
1509 _fields_type_annotations =
1510 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1511 length,
1512 nullptr,
1513 CHECK);
1514 }
1515 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1516 parsed_annotations.set_field_type_annotations(nullptr);
1517 }
1518
1519 if (is_synthetic) {
1520 access_flags.set_is_synthetic();
1521 }
1522 if (generic_signature_index != 0) {
1523 fieldFlags.update_generic(true);
1524 }
1525 }
1526
1527 if (is_null_restricted) {
1528 fieldFlags.update_null_free_inline_type(true);
1529 if (is_static) {
1530 _has_null_restricted_static_fields = true;
1531 }
1532 }
1533
1534 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1535
1536 // Update number of static oop fields.
1537 if (is_static && is_reference_type(type)) {
1538 _static_oop_count++;
1539 }
1540
1541 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1542 fi.set_index(n);
1543 if (fieldFlags.is_generic()) {
1544 fi.set_generic_signature_index(generic_signature_index);
1545 }
1546 parsed_annotations.apply_to(&fi);
1547 if (fi.field_flags().is_contended()) {
1548 _has_contended_fields = true;
1549 }
1550 if (access_flags.is_strict() && access_flags.is_static()) {
1551 _has_strict_static_fields = true;
1552 }
1553 _temp_field_info->append(fi);
1554 }
1555 assert(_temp_field_info->length() == length, "Must be");
1556
1557 if (num_injected != 0) {
1558 for (int n = 0; n < num_injected; n++) {
1559 // Check for duplicates
1560 if (injected[n].may_be_java) {
1561 const Symbol* const name = injected[n].name();
1562 const Symbol* const signature = injected[n].signature();
1563 bool duplicate = false;
1564 for (int i = 0; i < length; i++) {
1565 const FieldInfo* const f = _temp_field_info->adr_at(i);
1566 if (name == cp->symbol_at(f->name_index()) &&
1567 signature == cp->symbol_at(f->signature_index())) {
1568 // Symbol is desclared in Java so skip this one
1569 duplicate = true;
1570 break;
1571 }
1572 }
1573 if (duplicate) {
1574 // These will be removed from the field array at the end
1575 continue;
1576 }
1577 }
1578
1579 // Injected field
1580 FieldInfo::FieldFlags fflags(0);
1581 fflags.update_injected(true);
1582 AccessFlags aflags;
1583 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1584 int idx = _temp_field_info->append(fi);
1585 _temp_field_info->adr_at(idx)->set_index(idx);
1586 }
1587 }
1588
1589 if (is_inline_type) {
1590 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1591 // It should never be seen by user code, it is used when writing "null" to a nullable flat field
1592 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1593 // alive.
1594 FieldInfo::FieldFlags fflags2(0);
1595 fflags2.update_injected(true);
1596 AccessFlags aflags2(JVM_ACC_STATIC);
1597 FieldInfo fi2(aflags2,
1598 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1599 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1600 0,
1601 fflags2);
1602 int idx2 = _temp_field_info->append(fi2);
1603 _temp_field_info->adr_at(idx2)->set_index(idx2);
1604 _static_oop_count++;
1605 }
1606 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1607 && _class_name != vmSymbols::java_lang_Object()) {
1608 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1609 FieldInfo::FieldFlags fflags2(0);
1610 fflags2.update_injected(true);
1611 fflags2.update_stable(true);
1612 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1613 FieldInfo fi3(aflags2,
1614 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1615 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1616 0,
1617 fflags2);
1618 int idx2 = _temp_field_info->append(fi3);
1619 _temp_field_info->adr_at(idx2)->set_index(idx2);
1620 _static_oop_count++;
1621 }
1622
1623 if (_need_verify && length > 1) {
1624 // Check duplicated fields
1625 ResourceMark rm(THREAD);
1626 // Set containing name-signature pairs
1627 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1628 for (int i = 0; i < _temp_field_info->length(); i++) {
1629 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1630 _temp_field_info->adr_at(i)->signature(_cp));
1631 // If no duplicates, add name/signature in hashtable names_and_sigs.
1632 if(!names_and_sigs->put(name_and_sig, 0)) {
1633 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1634 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1635 return;
1636 }
1637 }
1638 }
1639 }
1640
1641
1642 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1643 u4 code_length,
1644 u4 exception_table_length,
1645 TRAPS) {
1646 assert(cfs != nullptr, "invariant");
1647
1648 const unsafe_u2* const exception_table_start = cfs->current();
1649 assert(exception_table_start != nullptr, "null exception table");
1650
1651 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1652 // end_pc,
1653 // handler_pc,
1654 // catch_type_index
1655
1656 // Will check legal target after parsing code array in verifier.
1657 if (_need_verify) {
1658 for (unsigned int i = 0; i < exception_table_length; i++) {
1659 const u2 start_pc = cfs->get_u2_fast();
1660 const u2 end_pc = cfs->get_u2_fast();
1661 const u2 handler_pc = cfs->get_u2_fast();
1662 const u2 catch_type_index = cfs->get_u2_fast();
1663 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1664 "Illegal exception table range in class file %s",
1665 CHECK_NULL);
1666 guarantee_property(handler_pc < code_length,
1667 "Illegal exception table handler in class file %s",
1668 CHECK_NULL);
1669 if (catch_type_index != 0) {
1670 guarantee_property(valid_klass_reference_at(catch_type_index),
1671 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1672 }
1673 }
1674 } else {
1675 cfs->skip_u2_fast(exception_table_length * 4);
1676 }
1677 return exception_table_start;
1678 }
1679
1680 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1681 u4 code_length,
1682 CompressedLineNumberWriteStream**const write_stream,
1683 TRAPS) {
1684
1685 const ClassFileStream* const cfs = _stream;
1686 unsigned int num_entries = cfs->get_u2(CHECK);
1687
1688 // Each entry is a u2 start_pc, and a u2 line_number
1689 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1690
1691 // Verify line number attribute and table length
1692 guarantee_property(
1693 code_attribute_length == sizeof(u2) + length_in_bytes,
1694 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1695
1696 cfs->guarantee_more(length_in_bytes, CHECK);
1697
1698 if ((*write_stream) == nullptr) {
1699 if (length_in_bytes > fixed_buffer_size) {
1700 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1701 } else {
1702 (*write_stream) = new CompressedLineNumberWriteStream(
1703 _linenumbertable_buffer, fixed_buffer_size);
1704 }
1705 }
1706
1707 while (num_entries-- > 0) {
1708 const u2 bci = cfs->get_u2_fast(); // start_pc
1709 const u2 line = cfs->get_u2_fast(); // line_number
1710 guarantee_property(bci < code_length,
1711 "Invalid pc in LineNumberTable in class file %s", CHECK);
1712 (*write_stream)->write_pair(bci, line);
1713 }
1714 }
1715
1716
1717 class LVT_Hash : public AllStatic {
1718 public:
1719
1720 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1721 /*
1722 * 3-tuple start_bci/length/slot has to be unique key,
1723 * so the following comparison seems to be redundant:
1724 * && elem->name_cp_index == entry->_elem->name_cp_index
1725 */
1726 return (e0.start_bci == e1.start_bci &&
1727 e0.length == e1.length &&
1728 e0.name_cp_index == e1.name_cp_index &&
1729 e0.slot == e1.slot);
1730 }
1731
1732 static unsigned int hash(LocalVariableTableElement const& e0) {
1733 unsigned int raw_hash = e0.start_bci;
1734
1735 raw_hash = e0.length + raw_hash * 37;
1736 raw_hash = e0.name_cp_index + raw_hash * 37;
1737 raw_hash = e0.slot + raw_hash * 37;
1738
1739 return raw_hash;
1740 }
1741 };
1742
1743
1744 // Class file LocalVariableTable elements.
1745 class Classfile_LVT_Element {
1746 public:
1747 u2 start_bci;
1748 u2 length;
1749 u2 name_cp_index;
1750 u2 descriptor_cp_index;
1751 u2 slot;
1752 };
1753
1754 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1755 LocalVariableTableElement* const lvt) {
1756 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1757 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1758 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1759 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1760 lvt->signature_cp_index = 0;
1761 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1762 }
1763
1764 // Function is used to parse both attributes:
1765 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1766 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1767 u4 code_length,
1768 u2 max_locals,
1769 u4 code_attribute_length,
1770 u2* const localvariable_table_length,
1771 bool isLVTT,
1772 TRAPS) {
1773 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1774 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1775 const unsigned int size = checked_cast<unsigned>(
1776 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1777
1778 const ConstantPool* const cp = _cp;
1779
1780 // Verify local variable table attribute has right length
1781 if (_need_verify) {
1782 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1783 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1784 }
1785
1786 const unsafe_u2* const localvariable_table_start = cfs->current();
1787 assert(localvariable_table_start != nullptr, "null local variable table");
1788 if (!_need_verify) {
1789 cfs->skip_u2_fast(size);
1790 } else {
1791 cfs->guarantee_more(size * 2, CHECK_NULL);
1792 for(int i = 0; i < (*localvariable_table_length); i++) {
1793 const u2 start_pc = cfs->get_u2_fast();
1794 const u2 length = cfs->get_u2_fast();
1795 const u2 name_index = cfs->get_u2_fast();
1796 const u2 descriptor_index = cfs->get_u2_fast();
1797 const u2 index = cfs->get_u2_fast();
1798 // Assign to a u4 to avoid overflow
1799 const u4 end_pc = (u4)start_pc + (u4)length;
1800
1801 if (start_pc >= code_length) {
1802 classfile_parse_error(
1803 "Invalid start_pc %u in %s in class file %s",
1804 start_pc, tbl_name, THREAD);
1805 return nullptr;
1806 }
1807 if (end_pc > code_length) {
1808 classfile_parse_error(
1809 "Invalid length %u in %s in class file %s",
1810 length, tbl_name, THREAD);
1811 return nullptr;
1812 }
1813 const int cp_size = cp->length();
1814 guarantee_property(valid_symbol_at(name_index),
1815 "Name index %u in %s has bad constant type in class file %s",
1816 name_index, tbl_name, CHECK_NULL);
1817 guarantee_property(valid_symbol_at(descriptor_index),
1818 "Signature index %u in %s has bad constant type in class file %s",
1819 descriptor_index, tbl_name, CHECK_NULL);
1820
1821 const Symbol* const name = cp->symbol_at(name_index);
1822 const Symbol* const sig = cp->symbol_at(descriptor_index);
1823 verify_legal_field_name(name, CHECK_NULL);
1824 u2 extra_slot = 0;
1825 if (!isLVTT) {
1826 verify_legal_field_signature(name, sig, CHECK_NULL);
1827
1828 // 4894874: check special cases for double and long local variables
1829 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1830 sig == vmSymbols::type_signature(T_LONG)) {
1831 extra_slot = 1;
1832 }
1833 }
1834 guarantee_property((index + extra_slot) < max_locals,
1835 "Invalid index %u in %s in class file %s",
1836 index, tbl_name, CHECK_NULL);
1837 }
1838 }
1839 return localvariable_table_start;
1840 }
1841
1842 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1843 u4 code_attribute_length,
1844 TRAPS) {
1845 assert(cfs != nullptr, "invariant");
1846
1847 if (0 == code_attribute_length) {
1848 return nullptr;
1849 }
1850
1851 const u1* const stackmap_table_start = cfs->current();
1852 assert(stackmap_table_start != nullptr, "null stackmap table");
1853
1854 // check code_attribute_length
1855 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1856
1857 return stackmap_table_start;
1858 }
1859
1860 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1861 u2* const checked_exceptions_length,
1862 u4 method_attribute_length,
1863 TRAPS) {
1864 assert(cfs != nullptr, "invariant");
1865 assert(checked_exceptions_length != nullptr, "invariant");
1866
1867 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1868 *checked_exceptions_length = cfs->get_u2_fast();
1869 const unsigned int size =
1870 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1871 const unsafe_u2* const checked_exceptions_start = cfs->current();
1872 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1873 if (!_need_verify) {
1874 cfs->skip_u2_fast(size);
1875 } else {
1876 // Verify each value in the checked exception table
1877 u2 checked_exception;
1878 const u2 len = *checked_exceptions_length;
1879 cfs->guarantee_more(2 * len, CHECK_NULL);
1880 for (int i = 0; i < len; i++) {
1881 checked_exception = cfs->get_u2_fast();
1882 guarantee_property(
1883 valid_klass_reference_at(checked_exception),
1884 "Exception name has bad type at constant pool %u in class file %s",
1885 checked_exception, CHECK_NULL);
1886 }
1887 }
1888 // check exceptions attribute length
1889 if (_need_verify) {
1890 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1891 sizeof(u2) * size),
1892 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1893 }
1894 return checked_exceptions_start;
1895 }
1896
1897 void ClassFileParser::throwIllegalSignature(const char* type,
1898 const Symbol* name,
1899 const Symbol* sig,
1900 TRAPS) const {
1901 assert(name != nullptr, "invariant");
1902 assert(sig != nullptr, "invariant");
1903
1904 ResourceMark rm(THREAD);
1905 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1906 Exceptions::fthrow(THREAD_AND_LOCATION,
1907 vmSymbols::java_lang_ClassFormatError(),
1908 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1909 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1910 }
1911
1912 AnnotationCollector::ID
1913 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1914 const Symbol* name,
1915 const bool can_access_vm_annotations) {
1916 const vmSymbolID sid = vmSymbols::find_sid(name);
1917 // Privileged code can use all annotations. Other code silently drops some.
1918 const bool privileged = loader_data->is_boot_class_loader_data() ||
1919 loader_data->is_platform_class_loader_data() ||
1920 can_access_vm_annotations;
1921 switch (sid) {
1922 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1923 if (_location != _in_method) break; // only allow for methods
1924 if (!privileged) break; // only allow in privileged code
1925 return _method_CallerSensitive;
1926 }
1927 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1928 if (_location != _in_method) break; // only allow for methods
1929 if (!privileged) break; // only allow in privileged code
1930 return _method_ForceInline;
1931 }
1932 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1933 if (_location != _in_method) break; // only allow for methods
1934 if (!privileged) break; // only allow in privileged code
1935 return _method_DontInline;
1936 }
1937 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1938 if (_location != _in_method) break; // only allow for methods
1939 if (!privileged) break; // only allow in privileged code
1940 return _method_ChangesCurrentThread;
1941 }
1942 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1943 if (_location != _in_method) break; // only allow for methods
1944 if (!privileged) break; // only allow in privileged code
1945 return _method_JvmtiHideEvents;
1946 }
1947 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1948 if (_location != _in_method) break; // only allow for methods
1949 if (!privileged) break; // only allow in privileged code
1950 return _method_JvmtiMountTransition;
1951 }
1952 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1953 if (_location != _in_method) break; // only allow for methods
1954 if (!privileged) break; // only allow in privileged code
1955 return _method_InjectedProfile;
1956 }
1957 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1958 if (_location != _in_method) break; // only allow for methods
1959 if (!privileged) break; // only allow in privileged code
1960 return _method_LambdaForm_Compiled;
1961 }
1962 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1963 if (_location != _in_method) break; // only allow for methods
1964 if (!privileged) break; // only allow in privileged code
1965 return _method_Hidden;
1966 }
1967 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1968 if (_location != _in_method) break; // only allow for methods
1969 if (!privileged) break; // only allow in privileged code
1970 return _method_Scoped;
1971 }
1972 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1973 if (_location != _in_method) break; // only allow for methods
1974 if (!privileged) break; // only allow in privileged code
1975 return _method_IntrinsicCandidate;
1976 }
1977 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1978 if (_location != _in_field) break; // only allow for fields
1979 if (!privileged) break; // only allow in privileged code
1980 return _field_Stable;
1981 }
1982 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_TrustFinalFields_signature): {
1983 if (_location != _in_class) break; // only allow for classes
1984 if (!privileged) break; // only allow in privileged code
1985 return _jdk_internal_vm_annotation_TrustFinalFields;
1986 }
1987 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1988 if (_location != _in_field && _location != _in_class) {
1989 break; // only allow for fields and classes
1990 }
1991 if (!EnableContended || (RestrictContended && !privileged)) {
1992 break; // honor privileges
1993 }
1994 return _jdk_internal_vm_annotation_Contended;
1995 }
1996 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1997 if (_location != _in_method) break; // only allow for methods
1998 if (RestrictReservedStack && !privileged) break; // honor privileges
1999 return _jdk_internal_vm_annotation_ReservedStackAccess;
2000 }
2001 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
2002 if (_location != _in_class) break; // only allow for classes
2003 if (!privileged) break; // only allow in privileged code
2004 return _jdk_internal_ValueBased;
2005 }
2006 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2007 if (_location != _in_class) break; // only allow for classes
2008 return _jdk_internal_LooselyConsistentValue;
2009 }
2010 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2011 if (_location != _in_field) break; // only allow for fields
2012 return _jdk_internal_NullRestricted;
2013 }
2014 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2015 return _java_lang_Deprecated;
2016 }
2017 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2018 if (_location != _in_class) break; // only allow for classes
2019 if (!privileged) break; // only allow in privileged code
2020 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2021 }
2022 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2023 if (_location != _in_method) break; // only allow for methods
2024 if (!privileged) break; // only allow in privileged code
2025 return _method_AOTRuntimeSetup;
2026 }
2027 default: {
2028 break;
2029 }
2030 }
2031 return AnnotationCollector::_unknown;
2032 }
2033
2034 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2035 if (is_contended())
2036 // Setting the contended group also sets the contended bit in field flags
2037 f->set_contended_group(contended_group());
2038 if (is_stable())
2039 (f->field_flags_addr())->update_stable(true);
2040 }
2041
2042 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2043 // If there's an error deallocate metadata for field annotations
2044 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2045 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2046 }
2047
2048 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2049 if (has_annotation(_method_CallerSensitive))
2050 m->set_caller_sensitive();
2051 if (has_annotation(_method_ForceInline))
2052 m->set_force_inline();
2053 if (has_annotation(_method_DontInline))
2054 m->set_dont_inline();
2055 if (has_annotation(_method_ChangesCurrentThread))
2056 m->set_changes_current_thread();
2057 if (has_annotation(_method_JvmtiHideEvents))
2058 m->set_jvmti_hide_events();
2059 if (has_annotation(_method_JvmtiMountTransition))
2060 m->set_jvmti_mount_transition();
2061 if (has_annotation(_method_InjectedProfile))
2062 m->set_has_injected_profile();
2063 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2064 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2065 if (has_annotation(_method_Hidden))
2066 m->set_is_hidden();
2067 if (has_annotation(_method_Scoped))
2068 m->set_scoped();
2069 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2070 m->set_intrinsic_candidate();
2071 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2072 m->set_has_reserved_stack_access();
2073 if (has_annotation(_java_lang_Deprecated))
2074 m->set_deprecated();
2075 if (has_annotation(_java_lang_Deprecated_for_removal))
2076 m->set_deprecated_for_removal();
2077 }
2078
2079 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2080 assert(ik != nullptr, "invariant");
2081 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2082 ik->set_is_contended(is_contended());
2083 }
2084 if (has_annotation(_jdk_internal_ValueBased)) {
2085 ik->set_has_value_based_class_annotation();
2086 if (DiagnoseSyncOnValueBasedClasses) {
2087 ik->set_is_value_based();
2088 }
2089 }
2090 if (has_annotation(_java_lang_Deprecated)) {
2091 Array<Method*>* methods = ik->methods();
2092 int length = ik->methods()->length();
2093 for (int i = 0; i < length; i++) {
2094 Method* m = methods->at(i);
2095 m->set_deprecated();
2096 }
2097 }
2098 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2099 Array<Method*>* methods = ik->methods();
2100 int length = ik->methods()->length();
2101 for (int i = 0; i < length; i++) {
2102 Method* m = methods->at(i);
2103 m->set_deprecated_for_removal();
2104 }
2105 }
2106 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) {
2107 ik->set_has_aot_safe_initializer();
2108 }
2109 if (has_annotation(_jdk_internal_vm_annotation_TrustFinalFields)) {
2110 ik->set_trust_final_fields(true);
2111 }
2112 }
2113
2114 #define MAX_ARGS_SIZE 255
2115 #define MAX_CODE_SIZE 65535
2116 #define INITIAL_MAX_LVT_NUMBER 256
2117
2118 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2119 *
2120 * Rules for LVT's and LVTT's are:
2121 * - There can be any number of LVT's and LVTT's.
2122 * - If there are n LVT's, it is the same as if there was just
2123 * one LVT containing all the entries from the n LVT's.
2124 * - There may be no more than one LVT entry per local variable.
2125 * Two LVT entries are 'equal' if these fields are the same:
2126 * start_pc, length, name, slot
2127 * - There may be no more than one LVTT entry per each LVT entry.
2128 * Each LVTT entry has to match some LVT entry.
2129 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2130 */
2131 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2132 int lvt_cnt,
2133 u2* const localvariable_table_length,
2134 const unsafe_u2** const localvariable_table_start,
2135 int lvtt_cnt,
2136 u2* const localvariable_type_table_length,
2137 const unsafe_u2** const localvariable_type_table_start,
2138 TRAPS) {
2139
2140 ResourceMark rm(THREAD);
2141
2142 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*,
2143 256, AnyObj::RESOURCE_AREA, mtInternal,
2144 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2145
2146 LVT_HashTable* const table = new LVT_HashTable();
2147
2148 // To fill LocalVariableTable in
2149 const Classfile_LVT_Element* cf_lvt;
2150 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2151
2152 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2153 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2154 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2155 copy_lvt_element(&cf_lvt[idx], lvt);
2156 // If no duplicates, add LVT elem in hashtable.
2157 if (table->put(*lvt, lvt) == false
2158 && _need_verify
2159 && _major_version >= JAVA_1_5_VERSION) {
2160 classfile_parse_error("Duplicated LocalVariableTable attribute "
2161 "entry for '%s' in class file %s",
2162 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2163 THREAD);
2164 return;
2165 }
2166 }
2167 }
2168
2169 // To merge LocalVariableTable and LocalVariableTypeTable
2170 const Classfile_LVT_Element* cf_lvtt;
2171 LocalVariableTableElement lvtt_elem;
2172
2173 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2174 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2175 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2176 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2177 LocalVariableTableElement** entry = table->get(lvtt_elem);
2178 if (entry == nullptr) {
2179 if (_need_verify) {
2180 classfile_parse_error("LVTT entry for '%s' in class file %s "
2181 "does not match any LVT entry",
2182 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2183 THREAD);
2184 return;
2185 }
2186 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2187 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2188 "entry for '%s' in class file %s",
2189 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2190 THREAD);
2191 return;
2192 } else {
2193 // to add generic signatures into LocalVariableTable
2194 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2195 }
2196 }
2197 }
2198 }
2199
2200
2201 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2202 const u1* runtime_visible_annotations,
2203 int runtime_visible_annotations_length,
2204 const u1* runtime_visible_parameter_annotations,
2205 int runtime_visible_parameter_annotations_length,
2206 const u1* runtime_visible_type_annotations,
2207 int runtime_visible_type_annotations_length,
2208 const u1* annotation_default,
2209 int annotation_default_length,
2210 TRAPS) {
2211
2212 AnnotationArray* a;
2213
2214 if (runtime_visible_annotations_length > 0) {
2215 a = allocate_annotations(runtime_visible_annotations,
2216 runtime_visible_annotations_length,
2217 CHECK);
2218 cm->set_method_annotations(a);
2219 }
2220
2221 if (runtime_visible_parameter_annotations_length > 0) {
2222 a = allocate_annotations(runtime_visible_parameter_annotations,
2223 runtime_visible_parameter_annotations_length,
2224 CHECK);
2225 cm->set_parameter_annotations(a);
2226 }
2227
2228 if (annotation_default_length > 0) {
2229 a = allocate_annotations(annotation_default,
2230 annotation_default_length,
2231 CHECK);
2232 cm->set_default_annotations(a);
2233 }
2234
2235 if (runtime_visible_type_annotations_length > 0) {
2236 a = allocate_annotations(runtime_visible_type_annotations,
2237 runtime_visible_type_annotations_length,
2238 CHECK);
2239 cm->set_type_annotations(a);
2240 }
2241 }
2242
2243
2244 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2245 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2246 // Method* to save footprint, so we only know the size of the resulting Method* when the
2247 // entire method attribute is parsed.
2248 //
2249 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2250
2251 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2252 bool is_interface,
2253 bool is_identity_class,
2254 const ConstantPool* cp,
2255 bool* const has_localvariable_table,
2256 TRAPS) {
2257 assert(cfs != nullptr, "invariant");
2258 assert(cp != nullptr, "invariant");
2259 assert(has_localvariable_table != nullptr, "invariant");
2260
2261 ResourceMark rm(THREAD);
2262 // Parse fixed parts:
2263 // access_flags, name_index, descriptor_index, attributes_count
2264 cfs->guarantee_more(8, CHECK_NULL);
2265
2266 u2 flags = cfs->get_u2_fast();
2267 const u2 name_index = cfs->get_u2_fast();
2268 const int cp_size = cp->length();
2269 guarantee_property(
2270 valid_symbol_at(name_index),
2271 "Illegal constant pool index %u for method name in class file %s",
2272 name_index, CHECK_NULL);
2273 const Symbol* const name = cp->symbol_at(name_index);
2274 verify_legal_method_name(name, CHECK_NULL);
2275
2276 const u2 signature_index = cfs->get_u2_fast();
2277 guarantee_property(
2278 valid_symbol_at(signature_index),
2279 "Illegal constant pool index %u for method signature in class file %s",
2280 signature_index, CHECK_NULL);
2281 const Symbol* const signature = cp->symbol_at(signature_index);
2282
2283 if (name == vmSymbols::class_initializer_name()) {
2284 // We ignore the other access flags for a valid class initializer.
2285 // (JVM Spec 2nd ed., chapter 4.6)
2286 if (_major_version < 51) { // backward compatibility
2287 flags = JVM_ACC_STATIC;
2288 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2289 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2290 } else {
2291 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2292 return nullptr;
2293 }
2294 } else {
2295 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL);
2296 }
2297
2298 if (name == vmSymbols::object_initializer_name() && is_interface) {
2299 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2300 return nullptr;
2301 }
2302
2303 if (Arguments::is_valhalla_enabled()) {
2304 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2305 && ((flags & JVM_ACC_STATIC) == 0 )
2306 && !_access_flags.is_identity_class()) {
2307 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2308 return nullptr;
2309 }
2310 }
2311
2312 int args_size = -1; // only used when _need_verify is true
2313 if (_need_verify) {
2314 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2315 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2316 verify_legal_method_signature(name, signature, CHECK_NULL);
2317 if (args_size > MAX_ARGS_SIZE) {
2318 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2319 return nullptr;
2320 }
2321 }
2322
2323 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2324
2325 // Default values for code and exceptions attribute elements
2326 u2 max_stack = 0;
2327 u2 max_locals = 0;
2328 u4 code_length = 0;
2329 const u1* code_start = nullptr;
2330 u2 exception_table_length = 0;
2331 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2332 Array<int>* exception_handlers = Universe::the_empty_int_array();
2333 u2 checked_exceptions_length = 0;
2334 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2335 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2336 int linenumber_table_length = 0;
2337 int total_lvt_length = 0;
2338 u2 lvt_cnt = 0;
2339 u2 lvtt_cnt = 0;
2340 bool lvt_allocated = false;
2341 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2342 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2343 u2* localvariable_table_length = nullptr;
2344 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2345 u2* localvariable_type_table_length = nullptr;
2346 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2347 int method_parameters_length = -1;
2348 const u1* method_parameters_data = nullptr;
2349 bool method_parameters_seen = false;
2350 bool parsed_code_attribute = false;
2351 bool parsed_checked_exceptions_attribute = false;
2352 bool parsed_stackmap_attribute = false;
2353 // stackmap attribute - JDK1.5
2354 const u1* stackmap_data = nullptr;
2355 int stackmap_data_length = 0;
2356 u2 generic_signature_index = 0;
2357 MethodAnnotationCollector parsed_annotations;
2358 const u1* runtime_visible_annotations = nullptr;
2359 int runtime_visible_annotations_length = 0;
2360 const u1* runtime_visible_parameter_annotations = nullptr;
2361 int runtime_visible_parameter_annotations_length = 0;
2362 const u1* runtime_visible_type_annotations = nullptr;
2363 int runtime_visible_type_annotations_length = 0;
2364 bool runtime_invisible_annotations_exists = false;
2365 bool runtime_invisible_type_annotations_exists = false;
2366 bool runtime_invisible_parameter_annotations_exists = false;
2367 const u1* annotation_default = nullptr;
2368 int annotation_default_length = 0;
2369
2370 // Parse code and exceptions attribute
2371 u2 method_attributes_count = cfs->get_u2_fast();
2372 while (method_attributes_count--) {
2373 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2374 const u2 method_attribute_name_index = cfs->get_u2_fast();
2375 const u4 method_attribute_length = cfs->get_u4_fast();
2376 guarantee_property(
2377 valid_symbol_at(method_attribute_name_index),
2378 "Invalid method attribute name index %u in class file %s",
2379 method_attribute_name_index, CHECK_NULL);
2380
2381 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2382 if (method_attribute_name == vmSymbols::tag_code()) {
2383 // Parse Code attribute
2384 if (_need_verify) {
2385 guarantee_property(
2386 !access_flags.is_native() && !access_flags.is_abstract(),
2387 "Code attribute in native or abstract methods in class file %s",
2388 CHECK_NULL);
2389 }
2390 if (parsed_code_attribute) {
2391 classfile_parse_error("Multiple Code attributes in class file %s",
2392 THREAD);
2393 return nullptr;
2394 }
2395 parsed_code_attribute = true;
2396
2397 // Stack size, locals size, and code size
2398 cfs->guarantee_more(8, CHECK_NULL);
2399 max_stack = cfs->get_u2_fast();
2400 max_locals = cfs->get_u2_fast();
2401 code_length = cfs->get_u4_fast();
2402 if (_need_verify) {
2403 guarantee_property(args_size <= max_locals,
2404 "Arguments can't fit into locals in class file %s",
2405 CHECK_NULL);
2406 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2407 "Invalid method Code length %u in class file %s",
2408 code_length, CHECK_NULL);
2409 }
2410 // Code pointer
2411 code_start = cfs->current();
2412 assert(code_start != nullptr, "null code start");
2413 cfs->guarantee_more(code_length, CHECK_NULL);
2414 cfs->skip_u1_fast(code_length);
2415
2416 // Exception handler table
2417 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2418 exception_table_length = cfs->get_u2_fast();
2419 if (exception_table_length > 0) {
2420 exception_table_start = parse_exception_table(cfs,
2421 code_length,
2422 exception_table_length,
2423 CHECK_NULL);
2424 }
2425
2426 // Parse additional attributes in code attribute
2427 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2428 u2 code_attributes_count = cfs->get_u2_fast();
2429
2430 unsigned int calculated_attribute_length = 0;
2431
2432 calculated_attribute_length =
2433 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2434 calculated_attribute_length += checked_cast<unsigned int>(
2435 code_length +
2436 sizeof(exception_table_length) +
2437 sizeof(code_attributes_count) +
2438 exception_table_length *
2439 ( sizeof(u2) + // start_pc
2440 sizeof(u2) + // end_pc
2441 sizeof(u2) + // handler_pc
2442 sizeof(u2) )); // catch_type_index
2443
2444 while (code_attributes_count--) {
2445 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2446 const u2 code_attribute_name_index = cfs->get_u2_fast();
2447 const u4 code_attribute_length = cfs->get_u4_fast();
2448 calculated_attribute_length += code_attribute_length +
2449 (unsigned)sizeof(code_attribute_name_index) +
2450 (unsigned)sizeof(code_attribute_length);
2451 guarantee_property(valid_symbol_at(code_attribute_name_index),
2452 "Invalid code attribute name index %u in class file %s",
2453 code_attribute_name_index,
2454 CHECK_NULL);
2455 if (LoadLineNumberTables &&
2456 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2457 // Parse and compress line number table
2458 parse_linenumber_table(code_attribute_length,
2459 code_length,
2460 &linenumber_table,
2461 CHECK_NULL);
2462
2463 } else if (LoadLocalVariableTables &&
2464 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2465 // Parse local variable table
2466 if (!lvt_allocated) {
2467 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2468 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2469 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2470 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2471 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2472 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2473 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2474 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2475 lvt_allocated = true;
2476 }
2477 if (lvt_cnt == max_lvt_cnt) {
2478 max_lvt_cnt <<= 1;
2479 localvariable_table_length = REALLOC_RESOURCE_ARRAY(localvariable_table_length, lvt_cnt, max_lvt_cnt);
2480 localvariable_table_start = REALLOC_RESOURCE_ARRAY(localvariable_table_start, lvt_cnt, max_lvt_cnt);
2481 }
2482 localvariable_table_start[lvt_cnt] =
2483 parse_localvariable_table(cfs,
2484 code_length,
2485 max_locals,
2486 code_attribute_length,
2487 &localvariable_table_length[lvt_cnt],
2488 false, // is not LVTT
2489 CHECK_NULL);
2490 total_lvt_length += localvariable_table_length[lvt_cnt];
2491 lvt_cnt++;
2492 } else if (LoadLocalVariableTypeTables &&
2493 _major_version >= JAVA_1_5_VERSION &&
2494 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2495 if (!lvt_allocated) {
2496 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2497 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2498 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2499 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2500 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2501 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2502 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2503 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2504 lvt_allocated = true;
2505 }
2506 // Parse local variable type table
2507 if (lvtt_cnt == max_lvtt_cnt) {
2508 max_lvtt_cnt <<= 1;
2509 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2510 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2511 }
2512 localvariable_type_table_start[lvtt_cnt] =
2513 parse_localvariable_table(cfs,
2514 code_length,
2515 max_locals,
2516 code_attribute_length,
2517 &localvariable_type_table_length[lvtt_cnt],
2518 true, // is LVTT
2519 CHECK_NULL);
2520 lvtt_cnt++;
2521 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2522 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2523 // Stack map is only needed by the new verifier in JDK1.5.
2524 if (parsed_stackmap_attribute) {
2525 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2526 return nullptr;
2527 }
2528 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2529 stackmap_data_length = code_attribute_length;
2530 parsed_stackmap_attribute = true;
2531 } else {
2532 // Skip unknown attributes
2533 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2534 }
2535 }
2536 // check method attribute length
2537 if (_need_verify) {
2538 guarantee_property(method_attribute_length == calculated_attribute_length,
2539 "Code segment has wrong length in class file %s",
2540 CHECK_NULL);
2541 }
2542 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2543 // Parse Exceptions attribute
2544 if (parsed_checked_exceptions_attribute) {
2545 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2546 THREAD);
2547 return nullptr;
2548 }
2549 parsed_checked_exceptions_attribute = true;
2550 checked_exceptions_start =
2551 parse_checked_exceptions(cfs,
2552 &checked_exceptions_length,
2553 method_attribute_length,
2554 CHECK_NULL);
2555 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2556 // reject multiple method parameters
2557 if (method_parameters_seen) {
2558 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2559 THREAD);
2560 return nullptr;
2561 }
2562 method_parameters_seen = true;
2563 method_parameters_length = cfs->get_u1_fast();
2564 const u4 real_length = (method_parameters_length * 4u) + 1u;
2565 if (method_attribute_length != real_length) {
2566 classfile_parse_error(
2567 "Invalid MethodParameters method attribute length %u in class file",
2568 method_attribute_length, THREAD);
2569 return nullptr;
2570 }
2571 method_parameters_data = cfs->current();
2572 cfs->skip_u2_fast(method_parameters_length);
2573 cfs->skip_u2_fast(method_parameters_length);
2574 // ignore this attribute if it cannot be reflected
2575 if (!vmClasses::reflect_Parameter_klass_is_loaded())
2576 method_parameters_length = -1;
2577 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2578 if (method_attribute_length != 0) {
2579 classfile_parse_error(
2580 "Invalid Synthetic method attribute length %u in class file %s",
2581 method_attribute_length, THREAD);
2582 return nullptr;
2583 }
2584 // Should we check that there hasn't already been a synthetic attribute?
2585 access_flags.set_is_synthetic();
2586 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2587 if (method_attribute_length != 0) {
2588 classfile_parse_error(
2589 "Invalid Deprecated method attribute length %u in class file %s",
2590 method_attribute_length, THREAD);
2591 return nullptr;
2592 }
2593 } else if (_major_version >= JAVA_1_5_VERSION) {
2594 if (method_attribute_name == vmSymbols::tag_signature()) {
2595 if (generic_signature_index != 0) {
2596 classfile_parse_error(
2597 "Multiple Signature attributes for method in class file %s",
2598 THREAD);
2599 return nullptr;
2600 }
2601 if (method_attribute_length != 2) {
2602 classfile_parse_error(
2603 "Invalid Signature attribute length %u in class file %s",
2604 method_attribute_length, THREAD);
2605 return nullptr;
2606 }
2607 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2608 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2609 if (runtime_visible_annotations != nullptr) {
2610 classfile_parse_error(
2611 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2612 THREAD);
2613 return nullptr;
2614 }
2615 runtime_visible_annotations_length = method_attribute_length;
2616 runtime_visible_annotations = cfs->current();
2617 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2618 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2619 parse_annotations(cp,
2620 runtime_visible_annotations,
2621 runtime_visible_annotations_length,
2622 &parsed_annotations,
2623 _loader_data,
2624 _can_access_vm_annotations);
2625 cfs->skip_u1_fast(runtime_visible_annotations_length);
2626 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2627 if (runtime_invisible_annotations_exists) {
2628 classfile_parse_error(
2629 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2630 THREAD);
2631 return nullptr;
2632 }
2633 runtime_invisible_annotations_exists = true;
2634 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2635 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2636 if (runtime_visible_parameter_annotations != nullptr) {
2637 classfile_parse_error(
2638 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2639 THREAD);
2640 return nullptr;
2641 }
2642 runtime_visible_parameter_annotations_length = method_attribute_length;
2643 runtime_visible_parameter_annotations = cfs->current();
2644 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2645 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2646 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2647 if (runtime_invisible_parameter_annotations_exists) {
2648 classfile_parse_error(
2649 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2650 THREAD);
2651 return nullptr;
2652 }
2653 runtime_invisible_parameter_annotations_exists = true;
2654 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2655 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2656 if (annotation_default != nullptr) {
2657 classfile_parse_error(
2658 "Multiple AnnotationDefault attributes for method in class file %s",
2659 THREAD);
2660 return nullptr;
2661 }
2662 annotation_default_length = method_attribute_length;
2663 annotation_default = cfs->current();
2664 assert(annotation_default != nullptr, "null annotation default");
2665 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2666 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2667 if (runtime_visible_type_annotations != nullptr) {
2668 classfile_parse_error(
2669 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2670 THREAD);
2671 return nullptr;
2672 }
2673 runtime_visible_type_annotations_length = method_attribute_length;
2674 runtime_visible_type_annotations = cfs->current();
2675 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2676 // No need for the VM to parse Type annotations
2677 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2678 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2679 if (runtime_invisible_type_annotations_exists) {
2680 classfile_parse_error(
2681 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2682 THREAD);
2683 return nullptr;
2684 }
2685 runtime_invisible_type_annotations_exists = true;
2686 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2687 } else {
2688 // Skip unknown attributes
2689 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2690 }
2691 } else {
2692 // Skip unknown attributes
2693 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2694 }
2695 }
2696
2697 if (linenumber_table != nullptr) {
2698 linenumber_table->write_terminator();
2699 linenumber_table_length = linenumber_table->position();
2700 }
2701
2702 // Make sure there's at least one Code attribute in non-native/non-abstract method
2703 if (_need_verify) {
2704 guarantee_property(access_flags.is_native() ||
2705 access_flags.is_abstract() ||
2706 parsed_code_attribute,
2707 "Absent Code attribute in method that is not native or abstract in class file %s",
2708 CHECK_NULL);
2709 }
2710
2711 // All sizing information for a Method* is finally available, now create it
2712 InlineTableSizes sizes(
2713 total_lvt_length,
2714 linenumber_table_length,
2715 exception_table_length,
2716 checked_exceptions_length,
2717 method_parameters_length,
2718 generic_signature_index,
2719 runtime_visible_annotations_length,
2720 runtime_visible_parameter_annotations_length,
2721 runtime_visible_type_annotations_length,
2722 annotation_default_length,
2723 0);
2724
2725 Method* const m = Method::allocate(_loader_data,
2726 code_length,
2727 access_flags,
2728 &sizes,
2729 ConstMethod::NORMAL,
2730 _cp->symbol_at(name_index),
2731 CHECK_NULL);
2732
2733 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2734
2735 // Fill in information from fixed part (access_flags already set)
2736 m->set_constants(_cp);
2737 m->set_name_index(name_index);
2738 m->set_signature_index(signature_index);
2739 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2740 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2741
2742 // Fill in code attribute information
2743 m->set_max_stack(max_stack);
2744 m->set_max_locals(max_locals);
2745 if (stackmap_data != nullptr) {
2746 m->constMethod()->copy_stackmap_data(_loader_data,
2747 (u1*)stackmap_data,
2748 stackmap_data_length,
2749 CHECK_NULL);
2750 }
2751
2752 // Copy byte codes
2753 m->set_code((u1*)code_start);
2754
2755 // Copy line number table
2756 if (linenumber_table != nullptr) {
2757 memcpy(m->compressed_linenumber_table(),
2758 linenumber_table->buffer(),
2759 linenumber_table_length);
2760 }
2761
2762 // Copy exception table
2763 if (exception_table_length > 0) {
2764 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2765 m->exception_table_start(),
2766 exception_table_length * sizeof(ExceptionTableElement),
2767 sizeof(u2));
2768 }
2769
2770 // Copy method parameters
2771 if (method_parameters_length > 0) {
2772 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2773 for (int i = 0; i < method_parameters_length; i++) {
2774 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2775 method_parameters_data += 2;
2776 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2777 method_parameters_data += 2;
2778 }
2779 }
2780
2781 // Copy checked exceptions
2782 if (checked_exceptions_length > 0) {
2783 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2784 m->checked_exceptions_start(),
2785 checked_exceptions_length * sizeof(CheckedExceptionElement),
2786 sizeof(u2));
2787 }
2788
2789 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2790 if (total_lvt_length > 0) {
2791 *has_localvariable_table = true;
2792 copy_localvariable_table(m->constMethod(),
2793 lvt_cnt,
2794 localvariable_table_length,
2795 localvariable_table_start,
2796 lvtt_cnt,
2797 localvariable_type_table_length,
2798 localvariable_type_table_start,
2799 CHECK_NULL);
2800 }
2801
2802 if (parsed_annotations.has_any_annotations())
2803 parsed_annotations.apply_to(methodHandle(THREAD, m));
2804
2805 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2806 m->set_is_hidden();
2807 }
2808 if (parsed_annotations.has_aot_runtime_setup()) {
2809 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() ||
2810 !access_flags.is_private() || !access_flags.is_static()) {
2811 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL);
2812 }
2813 _has_aot_runtime_setup_method = true;
2814 }
2815
2816 // Copy annotations
2817 copy_method_annotations(m->constMethod(),
2818 runtime_visible_annotations,
2819 runtime_visible_annotations_length,
2820 runtime_visible_parameter_annotations,
2821 runtime_visible_parameter_annotations_length,
2822 runtime_visible_type_annotations,
2823 runtime_visible_type_annotations_length,
2824 annotation_default,
2825 annotation_default_length,
2826 CHECK_NULL);
2827
2828 if (InstanceKlass::is_finalization_enabled() &&
2829 name == vmSymbols::finalize_method_name() &&
2830 signature == vmSymbols::void_method_signature() &&
2831 is_identity_class) {
2832 if (m->is_empty_method()) {
2833 _has_empty_finalizer = true;
2834 } else {
2835 _has_finalizer = true;
2836 }
2837 }
2838
2839 NOT_PRODUCT(m->verify());
2840 return m;
2841 }
2842
2843
2844 // Side-effects: populates the _methods field in the parser
2845 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2846 bool is_interface,
2847 bool* const has_localvariable_table,
2848 bool* has_final_method,
2849 bool* declares_nonstatic_concrete_methods,
2850 TRAPS) {
2851 assert(cfs != nullptr, "invariant");
2852 assert(has_localvariable_table != nullptr, "invariant");
2853 assert(has_final_method != nullptr, "invariant");
2854 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2855
2856 assert(nullptr == _methods, "invariant");
2857
2858 cfs->guarantee_more(2, CHECK); // length
2859 const u2 length = cfs->get_u2_fast();
2860 if (length == 0) {
2861 _methods = Universe::the_empty_method_array();
2862 } else {
2863 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2864 length,
2865 nullptr,
2866 CHECK);
2867
2868 for (int index = 0; index < length; index++) {
2869 Method* method = parse_method(cfs,
2870 is_interface,
2871 is_identity_class(),
2872 _cp,
2873 has_localvariable_table,
2874 CHECK);
2875
2876 if (method->is_final()) {
2877 *has_final_method = true;
2878 }
2879 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2880 // used for interface initialization, and default method inheritance analysis
2881 if (is_interface && !(*declares_nonstatic_concrete_methods)
2882 && !method->is_abstract() && !method->is_static()) {
2883 *declares_nonstatic_concrete_methods = true;
2884 }
2885 _methods->at_put(index, method);
2886 }
2887
2888 if (_need_verify && length > 1) {
2889 // Check duplicated methods
2890 ResourceMark rm(THREAD);
2891 // Set containing name-signature pairs
2892 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2893 for (int i = 0; i < length; i++) {
2894 const Method* const m = _methods->at(i);
2895 NameSigHash name_and_sig(m->name(), m->signature());
2896 // If no duplicates, add name/signature in hashtable names_and_sigs.
2897 if(!names_and_sigs->put(name_and_sig, 0)) {
2898 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2899 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2900 return;
2901 }
2902 }
2903 }
2904 }
2905 }
2906
2907 static const intArray* sort_methods(Array<Method*>* methods) {
2908 const int length = methods->length();
2909 // If JVMTI original method ordering or sharing is enabled we have to
2910 // remember the original class file ordering.
2911 // We temporarily use the vtable_index field in the Method* to store the
2912 // class file index, so we can read in after calling qsort.
2913 // Put the method ordering in the shared archive.
2914 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2915 for (int index = 0; index < length; index++) {
2916 Method* const m = methods->at(index);
2917 assert(!m->valid_vtable_index(), "vtable index should not be set");
2918 m->set_vtable_index(index);
2919 }
2920 }
2921 // Sort method array by ascending method name (for faster lookups & vtable construction)
2922 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2923 Method::sort_methods(methods);
2924
2925 intArray* method_ordering = nullptr;
2926 // If JVMTI original method ordering or sharing is enabled construct int
2927 // array remembering the original ordering
2928 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2929 method_ordering = new intArray(length, length, -1);
2930 for (int index = 0; index < length; index++) {
2931 Method* const m = methods->at(index);
2932 const int old_index = m->vtable_index();
2933 assert(old_index >= 0 && old_index < length, "invalid method index");
2934 method_ordering->at_put(index, old_index);
2935 m->set_vtable_index(Method::invalid_vtable_index);
2936 }
2937 }
2938 return method_ordering;
2939 }
2940
2941 // Parse generic_signature attribute for methods and fields
2942 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2943 TRAPS) {
2944 assert(cfs != nullptr, "invariant");
2945
2946 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2947 const u2 generic_signature_index = cfs->get_u2_fast();
2948 guarantee_property(
2949 valid_symbol_at(generic_signature_index),
2950 "Invalid Signature attribute at constant pool index %u in class file %s",
2951 generic_signature_index, CHECK_0);
2952 return generic_signature_index;
2953 }
2954
2955 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2956 TRAPS) {
2957
2958 assert(cfs != nullptr, "invariant");
2959
2960 cfs->guarantee_more(2, CHECK); // sourcefile_index
2961 const u2 sourcefile_index = cfs->get_u2_fast();
2962 guarantee_property(
2963 valid_symbol_at(sourcefile_index),
2964 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2965 sourcefile_index, CHECK);
2966 set_class_sourcefile_index(sourcefile_index);
2967 }
2968
2969 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2970 int length,
2971 TRAPS) {
2972 assert(cfs != nullptr, "invariant");
2973
2974 const u1* const sde_buffer = cfs->current();
2975 assert(sde_buffer != nullptr, "null sde buffer");
2976
2977 // Don't bother storing it if there is no way to retrieve it
2978 if (JvmtiExport::can_get_source_debug_extension()) {
2979 assert((length+1) > length, "Overflow checking");
2980 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2981 for (int i = 0; i < length; i++) {
2982 sde[i] = sde_buffer[i];
2983 }
2984 sde[length] = '\0';
2985 set_class_sde_buffer((const char*)sde, length);
2986 }
2987 // Got utf8 string, set stream position forward
2988 cfs->skip_u1(length, CHECK);
2989 }
2990
2991
2992 // Inner classes can be static, private or protected (classic VM does this)
2993 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2994 JVM_ACC_PRIVATE | \
2995 JVM_ACC_PROTECTED | \
2996 JVM_ACC_STATIC \
2997 )
2998
2999 // Find index of the InnerClasses entry for the specified inner_class_info_index.
3000 // Return -1 if none is found.
3001 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3002 Symbol* cp_klass_name = cp->klass_name_at(inner);
3003 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3004 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3005 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3006 return idx;
3007 }
3008 }
3009 return -1;
3010 }
3011
3012 // Return the outer_class_info_index for the InnerClasses entry containing the
3013 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
3014 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3015 if (inner == 0) return -1;
3016 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3017 if (idx == -1) return -1;
3018 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3019 return result;
3020 }
3021
3022 // Return true if circularity is found, false if no circularity is found.
3023 // Use Floyd's cycle finding algorithm.
3024 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3025 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3026 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3027
3028 while (fast != -1 && fast != 0) {
3029 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3030 return true; // found a circularity
3031 }
3032 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3033 if (fast == -1) return false;
3034 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3035 if (fast == -1) return false;
3036 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3037 assert(slow != -1, "sanity check");
3038 }
3039 return false;
3040 }
3041
3042 // Loop through each InnerClasses entry checking for circularities and duplications
3043 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3044 // return true if a circularity or entries with duplicate inner_class_info_indexes
3045 // are found.
3046 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3047 // Loop through each InnerClasses entry.
3048 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3049 // Return true if there are circular entries.
3050 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3051 return true;
3052 }
3053 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3054 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3055 y += InstanceKlass::inner_class_next_offset) {
3056
3057 // 4347400: make sure there's no duplicate entry in the classes array
3058 if (_major_version >= JAVA_1_5_VERSION) {
3059 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3060 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3061 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3062 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3063 "Duplicate entry in InnerClasses attribute in class file %s",
3064 CHECK_(true));
3065 }
3066 // Return true if there are two entries with the same inner_class_info_index.
3067 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3068 return true;
3069 }
3070 }
3071 }
3072 return false;
3073 }
3074
3075 // Return number of classes in the inner classes attribute table
3076 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3077 const ConstantPool* cp,
3078 const u1* const inner_classes_attribute_start,
3079 bool parsed_enclosingmethod_attribute,
3080 u2 enclosing_method_class_index,
3081 u2 enclosing_method_method_index,
3082 TRAPS) {
3083 const u1* const current_mark = cfs->current();
3084 u2 length = 0;
3085 if (inner_classes_attribute_start != nullptr) {
3086 cfs->set_current(inner_classes_attribute_start);
3087 cfs->guarantee_more(2, CHECK_0); // length
3088 length = cfs->get_u2_fast();
3089 }
3090
3091 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3092 // method data:
3093 // [inner_class_info_index,
3094 // outer_class_info_index,
3095 // inner_name_index,
3096 // inner_class_access_flags,
3097 // ...
3098 // enclosing_method_class_index,
3099 // enclosing_method_method_index]
3100 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3101 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3102 _inner_classes = inner_classes;
3103
3104 int index = 0;
3105 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3106 for (int n = 0; n < length; n++) {
3107 // Inner class index
3108 const u2 inner_class_info_index = cfs->get_u2_fast();
3109 guarantee_property(
3110 valid_klass_reference_at(inner_class_info_index),
3111 "inner_class_info_index %u has bad constant type in class file %s",
3112 inner_class_info_index, CHECK_0);
3113 // Outer class index
3114 const u2 outer_class_info_index = cfs->get_u2_fast();
3115 guarantee_property(
3116 outer_class_info_index == 0 ||
3117 valid_klass_reference_at(outer_class_info_index),
3118 "outer_class_info_index %u has bad constant type in class file %s",
3119 outer_class_info_index, CHECK_0);
3120
3121 if (outer_class_info_index != 0) {
3122 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3123 char* bytes = (char*)outer_class_name->bytes();
3124 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3125 "Outer class is an array class in class file %s", CHECK_0);
3126 }
3127 // Inner class name
3128 const u2 inner_name_index = cfs->get_u2_fast();
3129 guarantee_property(
3130 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3131 "inner_name_index %u has bad constant type in class file %s",
3132 inner_name_index, CHECK_0);
3133 if (_need_verify) {
3134 guarantee_property(inner_class_info_index != outer_class_info_index,
3135 "Class is both outer and inner class in class file %s", CHECK_0);
3136 }
3137
3138 // Access flags
3139 u2 flags;
3140 // JVM_ACC_MODULE is defined in JDK-9 and later.
3141 if (_major_version >= JAVA_9_VERSION) {
3142 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3143 } else {
3144 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3145 }
3146
3147 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3148 // Set abstract bit for old class files for backward compatibility
3149 flags |= JVM_ACC_ABSTRACT;
3150 }
3151
3152 if (!supports_inline_types()) {
3153 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3154 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3155 if (!is_module && !is_interface) {
3156 flags |= JVM_ACC_IDENTITY;
3157 }
3158 }
3159
3160 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3161 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3162 AccessFlags inner_access_flags(flags);
3163
3164 inner_classes->at_put(index++, inner_class_info_index);
3165 inner_classes->at_put(index++, outer_class_info_index);
3166 inner_classes->at_put(index++, inner_name_index);
3167 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3168 }
3169
3170 // Check for circular and duplicate entries.
3171 bool has_circularity = false;
3172 if (_need_verify) {
3173 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3174 if (has_circularity) {
3175 // If circularity check failed then ignore InnerClasses attribute.
3176 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3177 index = 0;
3178 if (parsed_enclosingmethod_attribute) {
3179 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3180 _inner_classes = inner_classes;
3181 } else {
3182 _inner_classes = Universe::the_empty_short_array();
3183 }
3184 }
3185 }
3186 // Set EnclosingMethod class and method indexes.
3187 if (parsed_enclosingmethod_attribute) {
3188 inner_classes->at_put(index++, enclosing_method_class_index);
3189 inner_classes->at_put(index++, enclosing_method_method_index);
3190 }
3191 assert(index == size || has_circularity, "wrong size");
3192
3193 // Restore buffer's current position.
3194 cfs->set_current(current_mark);
3195
3196 return length;
3197 }
3198
3199 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3200 const u1* const nest_members_attribute_start,
3201 TRAPS) {
3202 const u1* const current_mark = cfs->current();
3203 u2 length = 0;
3204 if (nest_members_attribute_start != nullptr) {
3205 cfs->set_current(nest_members_attribute_start);
3206 cfs->guarantee_more(2, CHECK_0); // length
3207 length = cfs->get_u2_fast();
3208 }
3209 const int size = length;
3210 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3211 _nest_members = nest_members;
3212
3213 int index = 0;
3214 cfs->guarantee_more(2 * length, CHECK_0);
3215 for (int n = 0; n < length; n++) {
3216 const u2 class_info_index = cfs->get_u2_fast();
3217 guarantee_property(
3218 valid_klass_reference_at(class_info_index),
3219 "Nest member class_info_index %u has bad constant type in class file %s",
3220 class_info_index, CHECK_0);
3221 nest_members->at_put(index++, class_info_index);
3222 }
3223 assert(index == size, "wrong size");
3224
3225 // Restore buffer's current position.
3226 cfs->set_current(current_mark);
3227
3228 return length;
3229 }
3230
3231 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3232 const u1* const permitted_subclasses_attribute_start,
3233 TRAPS) {
3234 const u1* const current_mark = cfs->current();
3235 u2 length = 0;
3236 if (permitted_subclasses_attribute_start != nullptr) {
3237 cfs->set_current(permitted_subclasses_attribute_start);
3238 cfs->guarantee_more(2, CHECK_0); // length
3239 length = cfs->get_u2_fast();
3240 }
3241 const int size = length;
3242 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3243 _permitted_subclasses = permitted_subclasses;
3244
3245 if (length > 0) {
3246 int index = 0;
3247 cfs->guarantee_more(2 * length, CHECK_0);
3248 for (int n = 0; n < length; n++) {
3249 const u2 class_info_index = cfs->get_u2_fast();
3250 guarantee_property(
3251 valid_klass_reference_at(class_info_index),
3252 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3253 class_info_index, CHECK_0);
3254 permitted_subclasses->at_put(index++, class_info_index);
3255 }
3256 assert(index == size, "wrong size");
3257 }
3258
3259 // Restore buffer's current position.
3260 cfs->set_current(current_mark);
3261
3262 return length;
3263 }
3264
3265 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3266 const u1* const loadable_descriptors_attribute_start,
3267 TRAPS) {
3268 const u1* const current_mark = cfs->current();
3269 u2 length = 0;
3270 if (loadable_descriptors_attribute_start != nullptr) {
3271 cfs->set_current(loadable_descriptors_attribute_start);
3272 cfs->guarantee_more(2, CHECK_0); // length
3273 length = cfs->get_u2_fast();
3274 }
3275 const int size = length;
3276 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3277 _loadable_descriptors = loadable_descriptors;
3278 if (length > 0) {
3279 int index = 0;
3280 cfs->guarantee_more(2 * length, CHECK_0);
3281 for (int n = 0; n < length; n++) {
3282 const u2 descriptor_index = cfs->get_u2_fast();
3283 guarantee_property(
3284 valid_symbol_at(descriptor_index),
3285 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3286 descriptor_index, CHECK_0);
3287 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3288 bool valid = legal_field_signature(descriptor, CHECK_0);
3289 if (!valid) {
3290 ResourceMark rm(THREAD);
3291 Exceptions::fthrow(THREAD_AND_LOCATION,
3292 vmSymbols::java_lang_ClassFormatError(),
3293 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3294 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3295 return 0;
3296 }
3297 loadable_descriptors->at_put(index++, descriptor_index);
3298 }
3299 assert(index == size, "wrong size");
3300 }
3301
3302 // Restore buffer's current position.
3303 cfs->set_current(current_mark);
3304
3305 return length;
3306 }
3307
3308 // Record {
3309 // u2 attribute_name_index;
3310 // u4 attribute_length;
3311 // u2 components_count;
3312 // component_info components[components_count];
3313 // }
3314 // component_info {
3315 // u2 name_index;
3316 // u2 descriptor_index
3317 // u2 attributes_count;
3318 // attribute_info_attributes[attributes_count];
3319 // }
3320 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3321 const ConstantPool* cp,
3322 const u1* const record_attribute_start,
3323 TRAPS) {
3324 const u1* const current_mark = cfs->current();
3325 int components_count = 0;
3326 unsigned int calculate_attr_size = 0;
3327 if (record_attribute_start != nullptr) {
3328 cfs->set_current(record_attribute_start);
3329 cfs->guarantee_more(2, CHECK_0); // num of components
3330 components_count = (int)cfs->get_u2_fast();
3331 calculate_attr_size = 2;
3332 }
3333
3334 Array<RecordComponent*>* const record_components =
3335 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3336 _record_components = record_components;
3337
3338 for (int x = 0; x < components_count; x++) {
3339 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3340
3341 const u2 name_index = cfs->get_u2_fast();
3342 guarantee_property(valid_symbol_at(name_index),
3343 "Invalid constant pool index %u for name in Record attribute in class file %s",
3344 name_index, CHECK_0);
3345 const Symbol* const name = cp->symbol_at(name_index);
3346 verify_legal_field_name(name, CHECK_0);
3347
3348 const u2 descriptor_index = cfs->get_u2_fast();
3349 guarantee_property(valid_symbol_at(descriptor_index),
3350 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3351 descriptor_index, CHECK_0);
3352 const Symbol* const descr = cp->symbol_at(descriptor_index);
3353 verify_legal_field_signature(name, descr, CHECK_0);
3354
3355 const u2 attributes_count = cfs->get_u2_fast();
3356 calculate_attr_size += 6;
3357 u2 generic_sig_index = 0;
3358 const u1* runtime_visible_annotations = nullptr;
3359 int runtime_visible_annotations_length = 0;
3360 bool runtime_invisible_annotations_exists = false;
3361 const u1* runtime_visible_type_annotations = nullptr;
3362 int runtime_visible_type_annotations_length = 0;
3363 bool runtime_invisible_type_annotations_exists = false;
3364
3365 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3366 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3367 for (int y = 0; y < attributes_count; y++) {
3368 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3369 const u2 attribute_name_index = cfs->get_u2_fast();
3370 const u4 attribute_length = cfs->get_u4_fast();
3371 calculate_attr_size += 6;
3372 guarantee_property(
3373 valid_symbol_at(attribute_name_index),
3374 "Invalid Record attribute name index %u in class file %s",
3375 attribute_name_index, CHECK_0);
3376
3377 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3378 if (attribute_name == vmSymbols::tag_signature()) {
3379 if (generic_sig_index != 0) {
3380 classfile_parse_error(
3381 "Multiple Signature attributes for Record component in class file %s",
3382 THREAD);
3383 return 0;
3384 }
3385 if (attribute_length != 2) {
3386 classfile_parse_error(
3387 "Invalid Signature attribute length %u in Record component in class file %s",
3388 attribute_length, THREAD);
3389 return 0;
3390 }
3391 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3392
3393 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3394 if (runtime_visible_annotations != nullptr) {
3395 classfile_parse_error(
3396 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3397 return 0;
3398 }
3399 runtime_visible_annotations_length = attribute_length;
3400 runtime_visible_annotations = cfs->current();
3401
3402 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3403 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3404 cfs->skip_u1_fast(runtime_visible_annotations_length);
3405
3406 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3407 if (runtime_invisible_annotations_exists) {
3408 classfile_parse_error(
3409 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3410 return 0;
3411 }
3412 runtime_invisible_annotations_exists = true;
3413 cfs->skip_u1(attribute_length, CHECK_0);
3414
3415 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3416 if (runtime_visible_type_annotations != nullptr) {
3417 classfile_parse_error(
3418 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3419 return 0;
3420 }
3421 runtime_visible_type_annotations_length = attribute_length;
3422 runtime_visible_type_annotations = cfs->current();
3423
3424 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3425 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3426 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3427
3428 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3429 if (runtime_invisible_type_annotations_exists) {
3430 classfile_parse_error(
3431 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3432 return 0;
3433 }
3434 runtime_invisible_type_annotations_exists = true;
3435 cfs->skip_u1(attribute_length, CHECK_0);
3436
3437 } else {
3438 // Skip unknown attributes
3439 cfs->skip_u1(attribute_length, CHECK_0);
3440 }
3441 calculate_attr_size += attribute_length;
3442 } // End of attributes For loop
3443
3444 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3445 runtime_visible_annotations_length,
3446 CHECK_0);
3447 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3448 runtime_visible_type_annotations_length,
3449 CHECK_0);
3450
3451 RecordComponent* record_component =
3452 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3453 annotations, type_annotations, CHECK_0);
3454 record_components->at_put(x, record_component);
3455 } // End of component processing loop
3456
3457 // Restore buffer's current position.
3458 cfs->set_current(current_mark);
3459 return calculate_attr_size;
3460 }
3461
3462 void ClassFileParser::parse_classfile_synthetic_attribute() {
3463 set_class_synthetic_flag(true);
3464 }
3465
3466 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3467 assert(cfs != nullptr, "invariant");
3468
3469 const u2 signature_index = cfs->get_u2(CHECK);
3470 guarantee_property(
3471 valid_symbol_at(signature_index),
3472 "Invalid constant pool index %u in Signature attribute in class file %s",
3473 signature_index, CHECK);
3474 set_class_generic_signature_index(signature_index);
3475 }
3476
3477 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3478 ConstantPool* cp,
3479 u4 attribute_byte_length,
3480 TRAPS) {
3481 assert(cfs != nullptr, "invariant");
3482 assert(cp != nullptr, "invariant");
3483 const int cp_size = cp->length();
3484
3485 const u1* const current_before_parsing = cfs->current();
3486
3487 guarantee_property(attribute_byte_length >= sizeof(u2),
3488 "Invalid BootstrapMethods attribute length %u in class file %s",
3489 attribute_byte_length,
3490 CHECK);
3491
3492 cfs->guarantee_more(attribute_byte_length, CHECK);
3493
3494 const int num_bootstrap_methods = cfs->get_u2_fast();
3495
3496 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods,
3497 "Short length on BootstrapMethods in class file %s",
3498 CHECK);
3499
3500 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3501
3502 // Eagerly assign the arrays so that they will be deallocated with the constant
3503 // pool if there is an error.
3504 BSMAttributeEntries::InsertionIterator iter =
3505 cp->bsm_entries().start_extension(num_bootstrap_methods,
3506 bootstrap_methods_u2_len,
3507 _loader_data,
3508 CHECK);
3509
3510 for (int i = 0; i < num_bootstrap_methods; i++) {
3511 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3512 u2 bootstrap_method_ref = cfs->get_u2_fast();
3513 u2 num_bootstrap_arguments = cfs->get_u2_fast();
3514 guarantee_property(
3515 valid_cp_range(bootstrap_method_ref, cp_size) &&
3516 cp->tag_at(bootstrap_method_ref).is_method_handle(),
3517 "bootstrap_method_index %u has bad constant type in class file %s",
3518 bootstrap_method_ref,
3519 CHECK);
3520 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc]
3521
3522 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments);
3523 guarantee_property(entry != nullptr,
3524 "Invalid BootstrapMethods num_bootstrap_methods."
3525 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK);
3526
3527 for (int argi = 0; argi < num_bootstrap_arguments; argi++) {
3528 const u2 argument_index = cfs->get_u2_fast();
3529 guarantee_property(
3530 valid_cp_range(argument_index, cp_size) &&
3531 cp->tag_at(argument_index).is_loadable_constant(),
3532 "argument_index %u has bad constant type in class file %s",
3533 argument_index,
3534 CHECK);
3535 entry->set_argument(argi, argument_index);
3536 }
3537 }
3538 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3539 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3540 "Bad length on BootstrapMethods in class file %s",
3541 CHECK);
3542 }
3543
3544 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3545 ConstantPool* cp,
3546 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3547 TRAPS) {
3548 assert(cfs != nullptr, "invariant");
3549 assert(cp != nullptr, "invariant");
3550 assert(parsed_annotations != nullptr, "invariant");
3551
3552 // Set inner classes attribute to default sentinel
3553 _inner_classes = Universe::the_empty_short_array();
3554 // Set nest members attribute to default sentinel
3555 _nest_members = Universe::the_empty_short_array();
3556 // Set _permitted_subclasses attribute to default sentinel
3557 _permitted_subclasses = Universe::the_empty_short_array();
3558 // Set _loadable_descriptors attribute to default sentinel
3559 _loadable_descriptors = Universe::the_empty_short_array();
3560 cfs->guarantee_more(2, CHECK); // attributes_count
3561 u2 attributes_count = cfs->get_u2_fast();
3562 bool parsed_sourcefile_attribute = false;
3563 bool parsed_innerclasses_attribute = false;
3564 bool parsed_nest_members_attribute = false;
3565 bool parsed_permitted_subclasses_attribute = false;
3566 bool parsed_loadable_descriptors_attribute = false;
3567 bool parsed_nest_host_attribute = false;
3568 bool parsed_record_attribute = false;
3569 bool parsed_enclosingmethod_attribute = false;
3570 bool parsed_bootstrap_methods_attribute = false;
3571 const u1* runtime_visible_annotations = nullptr;
3572 int runtime_visible_annotations_length = 0;
3573 const u1* runtime_visible_type_annotations = nullptr;
3574 int runtime_visible_type_annotations_length = 0;
3575 bool runtime_invisible_type_annotations_exists = false;
3576 bool runtime_invisible_annotations_exists = false;
3577 bool parsed_source_debug_ext_annotations_exist = false;
3578 const u1* inner_classes_attribute_start = nullptr;
3579 u4 inner_classes_attribute_length = 0;
3580 u2 enclosing_method_class_index = 0;
3581 u2 enclosing_method_method_index = 0;
3582 const u1* nest_members_attribute_start = nullptr;
3583 u4 nest_members_attribute_length = 0;
3584 const u1* record_attribute_start = nullptr;
3585 u4 record_attribute_length = 0;
3586 const u1* permitted_subclasses_attribute_start = nullptr;
3587 u4 permitted_subclasses_attribute_length = 0;
3588 const u1* loadable_descriptors_attribute_start = nullptr;
3589 u4 loadable_descriptors_attribute_length = 0;
3590
3591 // Iterate over attributes
3592 while (attributes_count--) {
3593 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3594 const u2 attribute_name_index = cfs->get_u2_fast();
3595 const u4 attribute_length = cfs->get_u4_fast();
3596 guarantee_property(
3597 valid_symbol_at(attribute_name_index),
3598 "Attribute name has bad constant pool index %u in class file %s",
3599 attribute_name_index, CHECK);
3600 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3601 if (tag == vmSymbols::tag_source_file()) {
3602 // Check for SourceFile tag
3603 if (_need_verify) {
3604 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3605 }
3606 if (parsed_sourcefile_attribute) {
3607 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3608 return;
3609 } else {
3610 parsed_sourcefile_attribute = true;
3611 }
3612 parse_classfile_sourcefile_attribute(cfs, CHECK);
3613 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3614 // Check for SourceDebugExtension tag
3615 if (parsed_source_debug_ext_annotations_exist) {
3616 classfile_parse_error(
3617 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3618 return;
3619 }
3620 parsed_source_debug_ext_annotations_exist = true;
3621 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3622 } else if (tag == vmSymbols::tag_inner_classes()) {
3623 // Check for InnerClasses tag
3624 if (parsed_innerclasses_attribute) {
3625 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3626 return;
3627 } else {
3628 parsed_innerclasses_attribute = true;
3629 }
3630 inner_classes_attribute_start = cfs->current();
3631 inner_classes_attribute_length = attribute_length;
3632 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3633 } else if (tag == vmSymbols::tag_synthetic()) {
3634 // Check for Synthetic tag
3635 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3636 if (attribute_length != 0) {
3637 classfile_parse_error(
3638 "Invalid Synthetic classfile attribute length %u in class file %s",
3639 attribute_length, THREAD);
3640 return;
3641 }
3642 parse_classfile_synthetic_attribute();
3643 } else if (tag == vmSymbols::tag_deprecated()) {
3644 // Check for Deprecated tag - 4276120
3645 if (attribute_length != 0) {
3646 classfile_parse_error(
3647 "Invalid Deprecated classfile attribute length %u in class file %s",
3648 attribute_length, THREAD);
3649 return;
3650 }
3651 } else if (_major_version >= JAVA_1_5_VERSION) {
3652 if (tag == vmSymbols::tag_signature()) {
3653 if (_generic_signature_index != 0) {
3654 classfile_parse_error(
3655 "Multiple Signature attributes in class file %s", THREAD);
3656 return;
3657 }
3658 if (attribute_length != 2) {
3659 classfile_parse_error(
3660 "Wrong Signature attribute length %u in class file %s",
3661 attribute_length, THREAD);
3662 return;
3663 }
3664 parse_classfile_signature_attribute(cfs, CHECK);
3665 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3666 if (runtime_visible_annotations != nullptr) {
3667 classfile_parse_error(
3668 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3669 return;
3670 }
3671 runtime_visible_annotations_length = attribute_length;
3672 runtime_visible_annotations = cfs->current();
3673 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3674 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3675 parse_annotations(cp,
3676 runtime_visible_annotations,
3677 runtime_visible_annotations_length,
3678 parsed_annotations,
3679 _loader_data,
3680 _can_access_vm_annotations);
3681 cfs->skip_u1_fast(runtime_visible_annotations_length);
3682 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3683 if (runtime_invisible_annotations_exists) {
3684 classfile_parse_error(
3685 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3686 return;
3687 }
3688 runtime_invisible_annotations_exists = true;
3689 cfs->skip_u1(attribute_length, CHECK);
3690 } else if (tag == vmSymbols::tag_enclosing_method()) {
3691 if (parsed_enclosingmethod_attribute) {
3692 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3693 return;
3694 } else {
3695 parsed_enclosingmethod_attribute = true;
3696 }
3697 guarantee_property(attribute_length == 4,
3698 "Wrong EnclosingMethod attribute length %u in class file %s",
3699 attribute_length, CHECK);
3700 cfs->guarantee_more(4, CHECK); // class_index, method_index
3701 enclosing_method_class_index = cfs->get_u2_fast();
3702 enclosing_method_method_index = cfs->get_u2_fast();
3703 if (enclosing_method_class_index == 0) {
3704 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3705 return;
3706 }
3707 // Validate the constant pool indices and types
3708 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3709 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3710 if (enclosing_method_method_index != 0 &&
3711 (!cp->is_within_bounds(enclosing_method_method_index) ||
3712 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3713 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3714 return;
3715 }
3716 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3717 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3718 if (parsed_bootstrap_methods_attribute) {
3719 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3720 return;
3721 }
3722 parsed_bootstrap_methods_attribute = true;
3723 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3724 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3725 if (runtime_visible_type_annotations != nullptr) {
3726 classfile_parse_error(
3727 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3728 return;
3729 }
3730 runtime_visible_type_annotations_length = attribute_length;
3731 runtime_visible_type_annotations = cfs->current();
3732 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3733 // No need for the VM to parse Type annotations
3734 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3735 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3736 if (runtime_invisible_type_annotations_exists) {
3737 classfile_parse_error(
3738 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3739 return;
3740 }
3741 runtime_invisible_type_annotations_exists = true;
3742 cfs->skip_u1(attribute_length, CHECK);
3743 } else if (_major_version >= JAVA_11_VERSION) {
3744 if (tag == vmSymbols::tag_nest_members()) {
3745 // Check for NestMembers tag
3746 if (parsed_nest_members_attribute) {
3747 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3748 return;
3749 } else {
3750 parsed_nest_members_attribute = true;
3751 }
3752 if (parsed_nest_host_attribute) {
3753 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3754 return;
3755 }
3756 nest_members_attribute_start = cfs->current();
3757 nest_members_attribute_length = attribute_length;
3758 cfs->skip_u1(nest_members_attribute_length, CHECK);
3759 } else if (tag == vmSymbols::tag_nest_host()) {
3760 if (parsed_nest_host_attribute) {
3761 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3762 return;
3763 } else {
3764 parsed_nest_host_attribute = true;
3765 }
3766 if (parsed_nest_members_attribute) {
3767 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3768 return;
3769 }
3770 if (_need_verify) {
3771 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3772 }
3773 cfs->guarantee_more(2, CHECK);
3774 u2 class_info_index = cfs->get_u2_fast();
3775 guarantee_property(
3776 valid_klass_reference_at(class_info_index),
3777 "Nest-host class_info_index %u has bad constant type in class file %s",
3778 class_info_index, CHECK);
3779 _nest_host = class_info_index;
3780
3781 } else if (_major_version >= JAVA_16_VERSION) {
3782 if (tag == vmSymbols::tag_record()) {
3783 if (parsed_record_attribute) {
3784 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3785 return;
3786 }
3787 parsed_record_attribute = true;
3788 record_attribute_start = cfs->current();
3789 record_attribute_length = attribute_length;
3790 } else if (_major_version >= JAVA_17_VERSION) {
3791 if (tag == vmSymbols::tag_permitted_subclasses()) {
3792 if (parsed_permitted_subclasses_attribute) {
3793 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3794 return;
3795 }
3796 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3797 if (_access_flags.is_final()) {
3798 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3799 return;
3800 }
3801 parsed_permitted_subclasses_attribute = true;
3802 permitted_subclasses_attribute_start = cfs->current();
3803 permitted_subclasses_attribute_length = attribute_length;
3804 }
3805 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3806 if (parsed_loadable_descriptors_attribute) {
3807 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3808 return;
3809 }
3810 parsed_loadable_descriptors_attribute = true;
3811 loadable_descriptors_attribute_start = cfs->current();
3812 loadable_descriptors_attribute_length = attribute_length;
3813 }
3814 }
3815 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3816 cfs->skip_u1(attribute_length, CHECK);
3817 } else {
3818 // Unknown attribute
3819 cfs->skip_u1(attribute_length, CHECK);
3820 }
3821 } else {
3822 // Unknown attribute
3823 cfs->skip_u1(attribute_length, CHECK);
3824 }
3825 } else {
3826 // Unknown attribute
3827 cfs->skip_u1(attribute_length, CHECK);
3828 }
3829 }
3830 _class_annotations = allocate_annotations(runtime_visible_annotations,
3831 runtime_visible_annotations_length,
3832 CHECK);
3833 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3834 runtime_visible_type_annotations_length,
3835 CHECK);
3836
3837 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3838 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3839 cfs,
3840 cp,
3841 inner_classes_attribute_start,
3842 parsed_innerclasses_attribute,
3843 enclosing_method_class_index,
3844 enclosing_method_method_index,
3845 CHECK);
3846 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3847 guarantee_property(
3848 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3849 "Wrong InnerClasses attribute length in class file %s", CHECK);
3850 }
3851 }
3852
3853 if (parsed_nest_members_attribute) {
3854 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3855 cfs,
3856 nest_members_attribute_start,
3857 CHECK);
3858 if (_need_verify) {
3859 guarantee_property(
3860 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3861 "Wrong NestMembers attribute length in class file %s", CHECK);
3862 }
3863 }
3864
3865 if (parsed_record_attribute) {
3866 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3867 cfs,
3868 cp,
3869 record_attribute_start,
3870 CHECK);
3871 if (_need_verify) {
3872 guarantee_property(record_attribute_length == calculated_attr_length,
3873 "Record attribute has wrong length in class file %s",
3874 CHECK);
3875 }
3876 }
3877
3878 if (parsed_permitted_subclasses_attribute) {
3879 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3880 cfs,
3881 permitted_subclasses_attribute_start,
3882 CHECK);
3883 if (_need_verify) {
3884 guarantee_property(
3885 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3886 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3887 }
3888 }
3889
3890 if (parsed_loadable_descriptors_attribute) {
3891 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3892 cfs,
3893 loadable_descriptors_attribute_start,
3894 CHECK);
3895 if (_need_verify) {
3896 guarantee_property(
3897 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3898 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3899 }
3900 }
3901
3902 if (_max_bootstrap_specifier_index >= 0) {
3903 guarantee_property(parsed_bootstrap_methods_attribute,
3904 "Missing BootstrapMethods attribute in class file %s", CHECK);
3905 }
3906 }
3907
3908 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3909 assert(k != nullptr, "invariant");
3910
3911 if (_synthetic_flag)
3912 k->set_is_synthetic();
3913 if (_sourcefile_index != 0) {
3914 k->set_source_file_name_index(_sourcefile_index);
3915 }
3916 if (_generic_signature_index != 0) {
3917 k->set_generic_signature_index(_generic_signature_index);
3918 }
3919 if (_sde_buffer != nullptr) {
3920 k->set_source_debug_extension(_sde_buffer, _sde_length);
3921 }
3922 }
3923
3924 // Create the Annotations object that will
3925 // hold the annotations array for the Klass.
3926 void ClassFileParser::create_combined_annotations(TRAPS) {
3927 if (_class_annotations == nullptr &&
3928 _class_type_annotations == nullptr &&
3929 _fields_annotations == nullptr &&
3930 _fields_type_annotations == nullptr) {
3931 // Don't create the Annotations object unnecessarily.
3932 return;
3933 }
3934
3935 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3936 annotations->set_class_annotations(_class_annotations);
3937 annotations->set_class_type_annotations(_class_type_annotations);
3938 annotations->set_fields_annotations(_fields_annotations);
3939 annotations->set_fields_type_annotations(_fields_type_annotations);
3940
3941 // This is the Annotations object that will be
3942 // assigned to InstanceKlass being constructed.
3943 _combined_annotations = annotations;
3944
3945 // The annotations arrays below has been transferred the
3946 // _combined_annotations so these fields can now be cleared.
3947 _class_annotations = nullptr;
3948 _class_type_annotations = nullptr;
3949 _fields_annotations = nullptr;
3950 _fields_type_annotations = nullptr;
3951 }
3952
3953 // Transfer ownership of metadata allocated to the InstanceKlass.
3954 void ClassFileParser::apply_parsed_class_metadata(
3955 InstanceKlass* this_klass,
3956 int java_fields_count) {
3957 assert(this_klass != nullptr, "invariant");
3958
3959 _cp->set_pool_holder(this_klass);
3960 this_klass->set_constants(_cp);
3961 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3962 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3963 this_klass->set_fields_status(_fields_status);
3964 this_klass->set_methods(_methods);
3965 this_klass->set_inner_classes(_inner_classes);
3966 this_klass->set_nest_members(_nest_members);
3967 this_klass->set_nest_host_index(_nest_host);
3968 this_klass->set_loadable_descriptors(_loadable_descriptors);
3969 this_klass->set_annotations(_combined_annotations);
3970 this_klass->set_permitted_subclasses(_permitted_subclasses);
3971 this_klass->set_record_components(_record_components);
3972 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3973
3974 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3975
3976 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3977 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3978 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3979 // its _super. If an OOM occurs while loading the current klass, its _super field
3980 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3981 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3982 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3983
3984 // Clear out these fields so they don't get deallocated by the destructor
3985 clear_class_metadata();
3986 }
3987
3988 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3989 int anno_length,
3990 TRAPS) {
3991 AnnotationArray* annotations = nullptr;
3992 if (anno != nullptr) {
3993 annotations = MetadataFactory::new_array<u1>(_loader_data,
3994 anno_length,
3995 CHECK_(annotations));
3996 for (int i = 0; i < anno_length; i++) {
3997 annotations->at_put(i, anno[i]);
3998 }
3999 }
4000 return annotations;
4001 }
4002
4003 void ClassFileParser::check_super_class(ConstantPool* const cp,
4004 const int super_class_index,
4005 const bool need_verify,
4006 TRAPS) {
4007 assert(cp != nullptr, "invariant");
4008
4009 if (super_class_index == 0) {
4010 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
4011 "Invalid superclass index 0 in class file %s",
4012 CHECK);
4013 } else {
4014 guarantee_property(valid_klass_reference_at(super_class_index),
4015 "Invalid superclass index %u in class file %s",
4016 super_class_index,
4017 CHECK);
4018
4019 // The class name should be legal because it is checked when parsing constant pool.
4020 // However, make sure it is not an array type.
4021 if (need_verify) {
4022 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4023 "Bad superclass name in class file %s", CHECK);
4024 }
4025 }
4026 }
4027
4028 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4029 _max_nonstatic_oop_maps = max_blocks;
4030 _nonstatic_oop_map_count = 0;
4031 if (max_blocks == 0) {
4032 _nonstatic_oop_maps = nullptr;
4033 } else {
4034 _nonstatic_oop_maps =
4035 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4036 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4037 }
4038 }
4039
4040 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4041 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4042 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4043 }
4044
4045 // addition of super oop maps
4046 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4047 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4048 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4049
4050 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4051 _nonstatic_oop_map_count += nof_blocks;
4052 }
4053
4054 // collection of oops
4055 void OopMapBlocksBuilder::add(int offset, int count) {
4056 if (_nonstatic_oop_map_count == 0) {
4057 _nonstatic_oop_map_count++;
4058 }
4059 OopMapBlock* nonstatic_oop_map = last_oop_map();
4060 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4061 nonstatic_oop_map->set_offset(offset);
4062 nonstatic_oop_map->set_count(count);
4063 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4064 nonstatic_oop_map->increment_count(count);
4065 } else { // Need a new one...
4066 _nonstatic_oop_map_count++;
4067 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4068 nonstatic_oop_map = last_oop_map();
4069 nonstatic_oop_map->set_offset(offset);
4070 nonstatic_oop_map->set_count(count);
4071 }
4072 }
4073
4074 // general purpose copy, e.g. into allocated instanceKlass
4075 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4076 if (_nonstatic_oop_map_count != 0) {
4077 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4078 }
4079 }
4080
4081 // Sort and compact adjacent blocks
4082 void OopMapBlocksBuilder::compact() {
4083 if (_nonstatic_oop_map_count <= 1) {
4084 return;
4085 }
4086 /*
4087 * Since field layout sneaks in oops before values, we will be able to condense
4088 * blocks. There is potential to compact between super, own refs and values
4089 * containing refs.
4090 *
4091 * Currently compaction is slightly limited due to values being 8 byte aligned.
4092 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4093 * and maybe it doesn't need to be.
4094 */
4095 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4096 (_sort_Fn)OopMapBlock::compare_offset);
4097 if (_nonstatic_oop_map_count < 2) {
4098 return;
4099 }
4100
4101 // Make a temp copy, and iterate through and copy back into the original
4102 ResourceMark rm;
4103 OopMapBlock* oop_maps_copy =
4104 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4105 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4106 copy(oop_maps_copy);
4107 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4108 unsigned int new_count = 1;
4109 oop_maps_copy++;
4110 while(oop_maps_copy < oop_maps_copy_end) {
4111 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4112 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4113 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4114 } else {
4115 nonstatic_oop_map++;
4116 new_count++;
4117 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4118 nonstatic_oop_map->set_count(oop_maps_copy->count());
4119 }
4120 oop_maps_copy++;
4121 }
4122 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4123 _nonstatic_oop_map_count = new_count;
4124 }
4125
4126 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4127 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4128 if (_nonstatic_oop_map_count > 0) {
4129 OopMapBlock* map = _nonstatic_oop_maps;
4130 OopMapBlock* last_map = last_oop_map();
4131 assert(map <= last_map, "Last less than first");
4132 while (map <= last_map) {
4133 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4134 map->offset() + map->offset_span() - heapOopSize, map->count());
4135 map++;
4136 }
4137 }
4138 }
4139
4140 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4141 print_on(st);
4142 }
4143
4144 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4145 assert(ik != nullptr, "invariant");
4146
4147 const InstanceKlass* const super = ik->super();
4148
4149 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4150 // in which case we don't have to register objects as finalizable
4151 if (!_has_empty_finalizer) {
4152 if (_has_finalizer ||
4153 (super != nullptr && super->has_finalizer())) {
4154 ik->set_has_finalizer();
4155 }
4156 }
4157
4158 #ifdef ASSERT
4159 bool f = false;
4160 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4161 vmSymbols::void_method_signature());
4162 if (InstanceKlass::is_finalization_enabled() &&
4163 (m != nullptr) && !m->is_empty_method() &&
4164 m->method_holder()->access_flags().is_identity_class()) {
4165 f = true;
4166 }
4167
4168 // Spec doesn't prevent agent from redefinition of empty finalizer.
4169 // Despite the fact that it's generally bad idea and redefined finalizer
4170 // will not work as expected we shouldn't abort vm in this case
4171 if (!ik->has_redefined_this_or_super()) {
4172 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4173 }
4174 #endif
4175
4176 // Check if this klass supports the java.lang.Cloneable interface
4177 if (vmClasses::Cloneable_klass_is_loaded()) {
4178 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4179 ik->set_is_cloneable();
4180 }
4181 }
4182
4183 // If it cannot be fast-path allocated, set a bit in the layout helper.
4184 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4185 assert(ik->size_helper() > 0, "layout_helper is initialized");
4186 if (ik->is_abstract() || ik->is_interface()
4187 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4188 || ik->size_helper() >= FastAllocateSizeLimit) {
4189 // Forbid fast-path allocation.
4190 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4191 ik->set_layout_helper(lh);
4192 }
4193
4194 // Propagate the AOT runtimeSetup method discovery
4195 if (_has_aot_runtime_setup_method) {
4196 ik->set_is_runtime_setup_required();
4197 if (log_is_enabled(Info, aot, init)) {
4198 ResourceMark rm;
4199 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4200 }
4201 }
4202 }
4203
4204 bool ClassFileParser::supports_inline_types() const {
4205 // Inline types are only supported by class file version 71.65535 and later
4206 return _major_version > JAVA_28_VERSION ||
4207 (_major_version == JAVA_28_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4208 }
4209
4210 // utility methods for appending an array with check for duplicates
4211
4212 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4213 const Array<InstanceKlass*>* const ifs) {
4214 // iterate over new interfaces
4215 for (int i = 0; i < ifs->length(); i++) {
4216 InstanceKlass* const e = ifs->at(i);
4217 assert(e->is_klass() && e->is_interface(), "just checking");
4218 // add new interface
4219 result->append_if_missing(e);
4220 }
4221 }
4222
4223 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4224 Array<InstanceKlass*>* local_ifs,
4225 ClassLoaderData* loader_data,
4226 TRAPS) {
4227 assert(local_ifs != nullptr, "invariant");
4228 assert(loader_data != nullptr, "invariant");
4229
4230 // Compute maximum size for transitive interfaces
4231 int max_transitive_size = 0;
4232 int super_size = 0;
4233 // Add superclass transitive interfaces size
4234 if (super != nullptr) {
4235 super_size = super->transitive_interfaces()->length();
4236 max_transitive_size += super_size;
4237 }
4238 // Add local interfaces' super interfaces
4239 const int local_size = local_ifs->length();
4240 for (int i = 0; i < local_size; i++) {
4241 InstanceKlass* const l = local_ifs->at(i);
4242 max_transitive_size += l->transitive_interfaces()->length();
4243 }
4244 // Finally add local interfaces
4245 max_transitive_size += local_size;
4246 // Construct array
4247 if (max_transitive_size == 0) {
4248 // no interfaces, use canonicalized array
4249 return Universe::the_empty_instance_klass_array();
4250 } else if (max_transitive_size == super_size) {
4251 // no new local interfaces added, share superklass' transitive interface array
4252 return super->transitive_interfaces();
4253 } else if (max_transitive_size == local_size) {
4254 // only local interfaces added, share local interface array
4255 return local_ifs;
4256 } else {
4257 ResourceMark rm;
4258 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4259
4260 // Copy down from superclass
4261 if (super != nullptr) {
4262 append_interfaces(result, super->transitive_interfaces());
4263 }
4264
4265 // Copy down from local interfaces' superinterfaces
4266 for (int i = 0; i < local_size; i++) {
4267 InstanceKlass* const l = local_ifs->at(i);
4268 append_interfaces(result, l->transitive_interfaces());
4269 }
4270 // Finally add local interfaces
4271 append_interfaces(result, local_ifs);
4272
4273 // length will be less than the max_transitive_size if duplicates were removed
4274 const int length = result->length();
4275 assert(length <= max_transitive_size, "just checking");
4276 Array<InstanceKlass*>* const new_result =
4277 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4278 for (int i = 0; i < length; i++) {
4279 InstanceKlass* const e = result->at(i);
4280 assert(e != nullptr, "just checking");
4281 new_result->at_put(i, e);
4282 }
4283 return new_result;
4284 }
4285 }
4286
4287 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4288 assert(this_klass != nullptr, "invariant");
4289 const InstanceKlass* const super = this_klass->super();
4290
4291 if (super != nullptr) {
4292 if (super->is_final()) {
4293 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4294 return;
4295 }
4296
4297 if (super->is_sealed()) {
4298 stringStream ss;
4299 ResourceMark rm(THREAD);
4300 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4301 classfile_icce_error(ss.as_string(), THREAD);
4302 return;
4303 }
4304 }
4305
4306 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4307 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4308 // for value classes. So, it is treated as a special case for now.
4309 if (!this_klass->access_flags().is_identity_class() &&
4310 super->name() != vmSymbols::java_lang_Object() &&
4311 super->is_identity_class()) {
4312 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4313 return;
4314 }
4315
4316 Reflection::VerifyClassAccessResults vca_result =
4317 Reflection::verify_class_access(this_klass, super, false);
4318 if (vca_result != Reflection::ACCESS_OK) {
4319 ResourceMark rm(THREAD);
4320 char* msg = Reflection::verify_class_access_msg(this_klass,
4321 super,
4322 vca_result);
4323
4324 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4325 if (msg == nullptr) {
4326 bool same_module = (this_klass->module() == super->module());
4327 Exceptions::fthrow(
4328 THREAD_AND_LOCATION,
4329 vmSymbols::java_lang_IllegalAccessError(),
4330 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4331 this_klass->external_name(),
4332 super->is_abstract() ? "abstract " : "",
4333 super->external_name(),
4334 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4335 (same_module) ? "" : "; ",
4336 (same_module) ? "" : super->class_in_module_of_loader());
4337 } else {
4338 // Add additional message content.
4339 Exceptions::fthrow(
4340 THREAD_AND_LOCATION,
4341 vmSymbols::java_lang_IllegalAccessError(),
4342 "superclass access check failed: %s",
4343 msg);
4344 }
4345 }
4346 }
4347 }
4348
4349
4350 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4351 assert(this_klass != nullptr, "invariant");
4352 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4353 const int lng = local_interfaces->length();
4354 for (int i = lng - 1; i >= 0; i--) {
4355 InstanceKlass* const k = local_interfaces->at(i);
4356 assert (k != nullptr && k->is_interface(), "invalid interface");
4357
4358 if (k->is_sealed()) {
4359 stringStream ss;
4360 ResourceMark rm(THREAD);
4361 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4362 classfile_icce_error(ss.as_string(), THREAD);
4363 return;
4364 }
4365 }
4366
4367 Reflection::VerifyClassAccessResults vca_result =
4368 Reflection::verify_class_access(this_klass, k, false);
4369 if (vca_result != Reflection::ACCESS_OK) {
4370 ResourceMark rm(THREAD);
4371 char* msg = Reflection::verify_class_access_msg(this_klass,
4372 k,
4373 vca_result);
4374
4375 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4376 if (msg == nullptr) {
4377 bool same_module = (this_klass->module() == k->module());
4378 Exceptions::fthrow(
4379 THREAD_AND_LOCATION,
4380 vmSymbols::java_lang_IllegalAccessError(),
4381 "class %s cannot access its superinterface %s (%s%s%s)",
4382 this_klass->external_name(),
4383 k->external_name(),
4384 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4385 (same_module) ? "" : "; ",
4386 (same_module) ? "" : k->class_in_module_of_loader());
4387 return;
4388 } else {
4389 // Add additional message content.
4390 Exceptions::fthrow(
4391 THREAD_AND_LOCATION,
4392 vmSymbols::java_lang_IllegalAccessError(),
4393 "superinterface check failed: %s",
4394 msg);
4395 return;
4396 }
4397 }
4398 }
4399 }
4400
4401
4402 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4403 assert(this_klass != nullptr, "invariant");
4404 const Array<Method*>* const methods = this_klass->methods();
4405 const int num_methods = methods->length();
4406
4407 // go thru each method and check if it overrides a final method
4408 for (int index = 0; index < num_methods; index++) {
4409 const Method* const m = methods->at(index);
4410
4411 // skip private, static, and <init> methods
4412 if ((!m->is_private() && !m->is_static()) &&
4413 (m->name() != vmSymbols::object_initializer_name())) {
4414
4415 const Symbol* const name = m->name();
4416 const Symbol* const signature = m->signature();
4417 const InstanceKlass* k = this_klass->super();
4418 const Method* super_m = nullptr;
4419 while (k != nullptr) {
4420 // skip supers that don't have final methods.
4421 if (k->has_final_method()) {
4422 // lookup a matching method in the super class hierarchy
4423 super_m = k->lookup_method(name, signature);
4424 if (super_m == nullptr) {
4425 break; // didn't find any match; get out
4426 }
4427
4428 if (super_m->is_final() && !super_m->is_static() &&
4429 !super_m->access_flags().is_private()) {
4430 // matching method in super is final, and not static or private
4431 bool can_access = Reflection::verify_member_access(this_klass,
4432 super_m->method_holder(),
4433 super_m->method_holder(),
4434 super_m->access_flags(),
4435 false, false, CHECK);
4436 if (can_access) {
4437 // this class can access super final method and therefore override
4438 ResourceMark rm(THREAD);
4439 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4440 err_msg("class %s overrides final method %s.%s%s",
4441 this_klass->external_name(),
4442 super_m->method_holder()->external_name(),
4443 name->as_C_string(),
4444 signature->as_C_string()));
4445 }
4446 }
4447
4448 // continue to look from super_m's holder's super.
4449 k = super_m->method_holder()->super();
4450 continue;
4451 }
4452
4453 k = k->super();
4454 }
4455 }
4456 }
4457 }
4458
4459
4460 // assumes that this_klass is an interface
4461 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4462 assert(this_klass != nullptr, "invariant");
4463 assert(this_klass->is_interface(), "not an interface");
4464 const Array<Method*>* methods = this_klass->methods();
4465 const int num_methods = methods->length();
4466
4467 for (int index = 0; index < num_methods; index++) {
4468 const Method* const m = methods->at(index);
4469 // if m is static and not the init method, throw a verify error
4470 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4471 ResourceMark rm(THREAD);
4472
4473 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4474 Exceptions::fthrow(
4475 THREAD_AND_LOCATION,
4476 vmSymbols::java_lang_VerifyError(),
4477 "Illegal static method %s in interface %s",
4478 m->name()->as_C_string(),
4479 this_klass->external_name()
4480 );
4481 return;
4482 }
4483 }
4484 }
4485
4486 // utility methods for format checking
4487
4488 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4489 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4490 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4491 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4492 if (is_module) {
4493 ResourceMark rm(THREAD);
4494 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4495 Exceptions::fthrow(
4496 THREAD_AND_LOCATION,
4497 vmSymbols::java_lang_NoClassDefFoundError(),
4498 "%s is not a class because access_flag ACC_MODULE is set",
4499 _class_name->as_C_string());
4500 return;
4501 }
4502
4503 if (!_need_verify) { return; }
4504
4505 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4506 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4507 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4508 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4509 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4510 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4511 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4512 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final));
4513
4514 if ((is_abstract && is_final) ||
4515 (is_interface && !is_abstract) ||
4516 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4517 (!is_interface && major_gte_1_5 && is_annotation) ||
4518 (!valid_value_class)) {
4519 ResourceMark rm(THREAD);
4520 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4521 if (inner_name == nullptr && !is_anonymous_inner_class) {
4522 Exceptions::fthrow(
4523 THREAD_AND_LOCATION,
4524 vmSymbols::java_lang_ClassFormatError(),
4525 "Illegal class modifiers in class %s: 0x%X",
4526 _class_name->as_C_string(), flags
4527 );
4528 } else {
4529 if (is_anonymous_inner_class) {
4530 Exceptions::fthrow(
4531 THREAD_AND_LOCATION,
4532 vmSymbols::java_lang_ClassFormatError(),
4533 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4534 _class_name->as_C_string(), flags
4535 );
4536 } else {
4537 Exceptions::fthrow(
4538 THREAD_AND_LOCATION,
4539 vmSymbols::java_lang_ClassFormatError(),
4540 "Illegal class modifiers in inner class %s of class %s: 0x%X",
4541 inner_name->as_C_string(), _class_name->as_C_string(), flags
4542 );
4543 }
4544 }
4545 return;
4546 }
4547 }
4548
4549 static bool has_illegal_visibility(jint flags) {
4550 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4551 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4552 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4553
4554 return ((is_public && is_protected) ||
4555 (is_public && is_private) ||
4556 (is_protected && is_private));
4557 }
4558
4559 // A legal major_version.minor_version must be one of the following:
4560 //
4561 // Major_version >= 45 and major_version < 56, any minor_version.
4562 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4563 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4564 //
4565 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4566 ResourceMark rm(THREAD);
4567 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4568 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4569 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4570 class_name, major, minor, THREAD);
4571 return;
4572 }
4573
4574 if (major > max_version) {
4575 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4576 Exceptions::fthrow(
4577 THREAD_AND_LOCATION,
4578 vmSymbols::java_lang_UnsupportedClassVersionError(),
4579 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4580 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4581 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4582 return;
4583 }
4584
4585 if (major < JAVA_12_VERSION || minor == 0) {
4586 return;
4587 }
4588
4589 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4590 if (major != max_version) {
4591 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4592 Exceptions::fthrow(
4593 THREAD_AND_LOCATION,
4594 vmSymbols::java_lang_UnsupportedClassVersionError(),
4595 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4596 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4597 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4598 return;
4599 }
4600
4601 if (!Arguments::enable_preview()) {
4602 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4603 class_name, major, minor, THREAD);
4604 return;
4605 }
4606
4607 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4608 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4609 class_name, major, minor, THREAD);
4610 }
4611 }
4612
4613 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4614 AccessFlags class_access_flags,
4615 TRAPS) const {
4616 if (!_need_verify) { return; }
4617
4618 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4619 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4620 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4621 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4622 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4623 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4624 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4625 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4626 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4627 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4628
4629 const bool is_interface = class_access_flags.is_interface();
4630 const bool is_identity_class = class_access_flags.is_identity_class();
4631
4632 bool is_illegal = false;
4633 const char* error_msg = "";
4634
4635 // There is some overlap in the checks that apply, for example interface fields
4636 // must be static, static fields can't be strict, and therefore interfaces can't
4637 // have strict fields. So we don't have to check every possible invalid combination
4638 // individually as long as all are covered. Once we have found an illegal combination
4639 // we can stop checking.
4640
4641 if (!is_illegal) {
4642 if (is_interface) {
4643 if (!is_public || !is_static || !is_final || is_private ||
4644 is_protected || is_volatile || is_transient ||
4645 (major_gte_1_5 && is_enum)) {
4646 is_illegal = true;
4647 error_msg = "interface fields must be public, static and final, and may be synthetic";
4648 }
4649 } else { // not interface
4650 if (has_illegal_visibility(flags)) {
4651 is_illegal = true;
4652 error_msg = "invalid visibility flags for class field";
4653 } else if (is_final && is_volatile) {
4654 is_illegal = true;
4655 error_msg = "fields cannot be final and volatile";
4656 } else if (supports_inline_types()) {
4657 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4658 is_illegal = true;
4659 error_msg = "value class fields must be either non-static final and strict, or static";
4660 }
4661 }
4662 }
4663 }
4664
4665 if (is_illegal) {
4666 ResourceMark rm(THREAD);
4667 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4668 Exceptions::fthrow(
4669 THREAD_AND_LOCATION,
4670 vmSymbols::java_lang_ClassFormatError(),
4671 "Illegal field modifiers (%s) in class %s: 0x%X",
4672 error_msg, _class_name->as_C_string(), flags);
4673 return;
4674 }
4675 }
4676
4677 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4678 AccessFlags class_access_flags,
4679 const Symbol* name,
4680 TRAPS) const {
4681 if (!_need_verify) { return; }
4682
4683 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4684 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4685 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4686 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4687 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4688 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4689 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4690 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4691 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4692 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4693 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4694 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4695 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4696 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4697 const bool is_interface = class_access_flags.is_interface();
4698 const bool is_identity_class = class_access_flags.is_identity_class();
4699
4700 bool is_illegal = false;
4701 const char* class_note = "";
4702
4703 if (is_interface) {
4704 if (major_gte_8) {
4705 // Class file version is JAVA_8_VERSION or later Methods of
4706 // interfaces may set any of the flags except ACC_PROTECTED,
4707 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4708 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4709 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4710 (is_native || is_protected || is_final || is_synchronized) ||
4711 // If a specific method of a class or interface has its
4712 // ACC_ABSTRACT flag set, it must not have any of its
4713 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4714 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4715 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4716 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4717 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4718 is_illegal = true;
4719 }
4720 } else if (major_gte_1_5) {
4721 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4722 if (!is_public || is_private || is_protected || is_static || is_final ||
4723 is_synchronized || is_native || !is_abstract || is_strict) {
4724 is_illegal = true;
4725 }
4726 } else {
4727 // Class file version is pre-JAVA_1_5_VERSION
4728 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4729 is_illegal = true;
4730 }
4731 }
4732 } else { // not interface
4733 if (has_illegal_visibility(flags)) {
4734 is_illegal = true;
4735 } else {
4736 if (is_initializer) {
4737 if (is_static || is_final || is_synchronized || is_native ||
4738 is_abstract || (major_gte_1_5 && is_bridge)) {
4739 is_illegal = true;
4740 }
4741 } else { // not initializer
4742 if (!is_identity_class && is_synchronized && !is_static) {
4743 is_illegal = true;
4744 class_note = " (not an identity class)";
4745 } else {
4746 if (is_abstract) {
4747 if ((is_final || is_native || is_private || is_static ||
4748 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4749 is_illegal = true;
4750 }
4751 }
4752 }
4753 }
4754 }
4755 }
4756
4757 if (is_illegal) {
4758 ResourceMark rm(THREAD);
4759 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4760 Exceptions::fthrow(
4761 THREAD_AND_LOCATION,
4762 vmSymbols::java_lang_ClassFormatError(),
4763 "Method %s in class %s%s has illegal modifiers: 0x%X",
4764 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
4765 return;
4766 }
4767 }
4768
4769 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4770 int length,
4771 TRAPS) const {
4772 assert(_need_verify, "only called when _need_verify is true");
4773 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4774 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4775 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4776 }
4777 }
4778
4779 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4780 // In class names, '/' separates unqualified names. This is verified in this function also.
4781 // Method names also may not contain the characters '<' or '>', unless <init>
4782 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4783 // method. Because these names have been checked as special cases before
4784 // calling this method in verify_legal_method_name.
4785 //
4786 // This method is also called from the modular system APIs in modules.cpp
4787 // to verify the validity of module and package names.
4788 bool ClassFileParser::verify_unqualified_name(const char* name,
4789 unsigned int length,
4790 int type) {
4791 if (length == 0) return false; // Must have at least one char.
4792 for (const char* p = name; p != name + length; p++) {
4793 switch(*p) {
4794 case JVM_SIGNATURE_DOT:
4795 case JVM_SIGNATURE_ENDCLASS:
4796 case JVM_SIGNATURE_ARRAY:
4797 // do not permit '.', ';', or '['
4798 return false;
4799 case JVM_SIGNATURE_SLASH:
4800 // check for '//' or leading or trailing '/' which are not legal
4801 // unqualified name must not be empty
4802 if (type == ClassFileParser::LegalClass) {
4803 if (p == name || p+1 >= name+length ||
4804 *(p+1) == JVM_SIGNATURE_SLASH) {
4805 return false;
4806 }
4807 } else {
4808 return false; // do not permit '/' unless it's class name
4809 }
4810 break;
4811 case JVM_SIGNATURE_SPECIAL:
4812 case JVM_SIGNATURE_ENDSPECIAL:
4813 // do not permit '<' or '>' in method names
4814 if (type == ClassFileParser::LegalMethod) {
4815 return false;
4816 }
4817 }
4818 }
4819 return true;
4820 }
4821
4822 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4823 if (_loadable_descriptors == nullptr) return false;
4824 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4825 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4826 if (class_name == klass) return true;
4827 }
4828 return false;
4829 }
4830
4831 // Take pointer to a UTF8 byte string (not NUL-terminated).
4832 // Skip over the longest part of the string that could
4833 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4834 // Return a pointer to just past the fieldname.
4835 // Return null if no fieldname at all was found, or in the case of slash_ok
4836 // being true, we saw consecutive slashes (meaning we were looking for a
4837 // qualified path but found something that was badly-formed).
4838 static const char* skip_over_field_name(const char* const name,
4839 bool slash_ok,
4840 unsigned int length) {
4841 const char* p;
4842 jboolean last_is_slash = false;
4843 jboolean not_first_ch = false;
4844
4845 for (p = name; p != name + length; not_first_ch = true) {
4846 const char* old_p = p;
4847 jchar ch = *p;
4848 if (ch < 128) {
4849 p++;
4850 // quick check for ascii
4851 if ((ch >= 'a' && ch <= 'z') ||
4852 (ch >= 'A' && ch <= 'Z') ||
4853 (ch == '_' || ch == '$') ||
4854 (not_first_ch && ch >= '0' && ch <= '9')) {
4855 last_is_slash = false;
4856 continue;
4857 }
4858 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4859 if (last_is_slash) {
4860 return nullptr; // Don't permit consecutive slashes
4861 }
4862 last_is_slash = true;
4863 continue;
4864 }
4865 }
4866 else {
4867 jint unicode_ch;
4868 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4869 p = tmp_p;
4870 last_is_slash = false;
4871 // Check if ch is Java identifier start or is Java identifier part
4872 // 4672820: call java.lang.Character methods directly without generating separate tables.
4873 EXCEPTION_MARK;
4874 // return value
4875 JavaValue result(T_BOOLEAN);
4876 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4877 JavaCallArguments args;
4878 args.push_int(unicode_ch);
4879
4880 if (not_first_ch) {
4881 // public static boolean isJavaIdentifierPart(char ch);
4882 JavaCalls::call_static(&result,
4883 vmClasses::Character_klass(),
4884 vmSymbols::isJavaIdentifierPart_name(),
4885 vmSymbols::int_bool_signature(),
4886 &args,
4887 THREAD);
4888 } else {
4889 // public static boolean isJavaIdentifierStart(char ch);
4890 JavaCalls::call_static(&result,
4891 vmClasses::Character_klass(),
4892 vmSymbols::isJavaIdentifierStart_name(),
4893 vmSymbols::int_bool_signature(),
4894 &args,
4895 THREAD);
4896 }
4897 if (HAS_PENDING_EXCEPTION) {
4898 CLEAR_PENDING_EXCEPTION;
4899 return nullptr;
4900 }
4901 if(result.get_jboolean()) {
4902 continue;
4903 }
4904 }
4905 return (not_first_ch) ? old_p : nullptr;
4906 }
4907 return (not_first_ch && !last_is_slash) ? p : nullptr;
4908 }
4909
4910 // Take pointer to a UTF8 byte string (not NUL-terminated).
4911 // Skip over the longest part of the string that could
4912 // be taken as a field signature. Allow "void" if void_ok.
4913 // Return a pointer to just past the signature.
4914 // Return null if no legal signature is found.
4915 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4916 bool void_ok,
4917 unsigned int length,
4918 TRAPS) const {
4919 unsigned int array_dim = 0;
4920 while (length > 0) {
4921 switch (signature[0]) {
4922 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4923 case JVM_SIGNATURE_BOOLEAN:
4924 case JVM_SIGNATURE_BYTE:
4925 case JVM_SIGNATURE_CHAR:
4926 case JVM_SIGNATURE_SHORT:
4927 case JVM_SIGNATURE_INT:
4928 case JVM_SIGNATURE_FLOAT:
4929 case JVM_SIGNATURE_LONG:
4930 case JVM_SIGNATURE_DOUBLE:
4931 return signature + 1;
4932 case JVM_SIGNATURE_CLASS: {
4933 if (_major_version < JAVA_1_5_VERSION) {
4934 signature++;
4935 length--;
4936 // Skip over the class name if one is there
4937 const char* const p = skip_over_field_name(signature, true, length);
4938 assert(p == nullptr || p > signature, "must parse one character at least");
4939 // The next character better be a semicolon
4940 if (p != nullptr && // Parse of field name succeeded.
4941 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4942 p[0] == JVM_SIGNATURE_ENDCLASS) {
4943 return p + 1;
4944 }
4945 }
4946 else {
4947 // Skip leading 'L' and ignore first appearance of ';'
4948 signature++;
4949 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4950 // Format check signature
4951 if (c != nullptr) {
4952 int newlen = pointer_delta_as_int(c, (char*) signature);
4953 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4954 if (!legal) {
4955 classfile_parse_error("Class name is empty or contains illegal character "
4956 "in descriptor in class file %s",
4957 THREAD);
4958 return nullptr;
4959 }
4960 return signature + newlen + 1;
4961 }
4962 }
4963 return nullptr;
4964 }
4965 case JVM_SIGNATURE_ARRAY:
4966 array_dim++;
4967 if (array_dim > 255) {
4968 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4969 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4970 return nullptr;
4971 }
4972 // The rest of what's there better be a legal signature
4973 signature++;
4974 length--;
4975 void_ok = false;
4976 break;
4977 default:
4978 return nullptr;
4979 }
4980 }
4981 return nullptr;
4982 }
4983
4984 // Checks if name is a legal class name.
4985 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4986 if (!_need_verify) { return; }
4987
4988 assert(name->refcount() > 0, "symbol must be kept alive");
4989 char* bytes = (char*)name->bytes();
4990 unsigned int length = name->utf8_length();
4991 bool legal = false;
4992
4993 if (length > 0) {
4994 const char* p;
4995 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4996 p = skip_over_field_signature(bytes, false, length, CHECK);
4997 legal = (p != nullptr) && ((p - bytes) == (int)length);
4998 } else if (_major_version < JAVA_1_5_VERSION) {
4999 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5000 p = skip_over_field_name(bytes, true, length);
5001 legal = (p != nullptr) && ((p - bytes) == (int)length);
5002 }
5003 } else {
5004 // 4900761: relax the constraints based on JSR202 spec
5005 // Class names may be drawn from the entire Unicode character set.
5006 // Identifiers between '/' must be unqualified names.
5007 // The utf8 string has been verified when parsing cpool entries.
5008 legal = verify_unqualified_name(bytes, length, LegalClass);
5009 }
5010 }
5011 if (!legal) {
5012 ResourceMark rm(THREAD);
5013 assert(_class_name != nullptr, "invariant");
5014 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5015 Exceptions::fthrow(
5016 THREAD_AND_LOCATION,
5017 vmSymbols::java_lang_ClassFormatError(),
5018 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5019 _class_name->as_C_string()
5020 );
5021 return;
5022 }
5023 }
5024
5025 // Checks if name is a legal field name.
5026 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5027 if (!_need_verify) { return; }
5028
5029 char* bytes = (char*)name->bytes();
5030 unsigned int length = name->utf8_length();
5031 bool legal = false;
5032
5033 if (length > 0) {
5034 if (_major_version < JAVA_1_5_VERSION) {
5035 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5036 const char* p = skip_over_field_name(bytes, false, length);
5037 legal = (p != nullptr) && ((p - bytes) == (int)length);
5038 }
5039 } else {
5040 // 4881221: relax the constraints based on JSR202 spec
5041 legal = verify_unqualified_name(bytes, length, LegalField);
5042 }
5043 }
5044
5045 if (!legal) {
5046 ResourceMark rm(THREAD);
5047 assert(_class_name != nullptr, "invariant");
5048 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5049 Exceptions::fthrow(
5050 THREAD_AND_LOCATION,
5051 vmSymbols::java_lang_ClassFormatError(),
5052 "Illegal field name \"%.*s\" in class %s", length, bytes,
5053 _class_name->as_C_string()
5054 );
5055 return;
5056 }
5057 }
5058
5059 // Checks if name is a legal method name.
5060 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5061 if (!_need_verify) { return; }
5062
5063 assert(name != nullptr, "method name is null");
5064 char* bytes = (char*)name->bytes();
5065 unsigned int length = name->utf8_length();
5066 bool legal = false;
5067
5068 if (length > 0) {
5069 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5070 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5071 legal = true;
5072 }
5073 } else if (_major_version < JAVA_1_5_VERSION) {
5074 const char* p;
5075 p = skip_over_field_name(bytes, false, length);
5076 legal = (p != nullptr) && ((p - bytes) == (int)length);
5077 } else {
5078 // 4881221: relax the constraints based on JSR202 spec
5079 legal = verify_unqualified_name(bytes, length, LegalMethod);
5080 }
5081 }
5082
5083 if (!legal) {
5084 ResourceMark rm(THREAD);
5085 assert(_class_name != nullptr, "invariant");
5086 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5087 Exceptions::fthrow(
5088 THREAD_AND_LOCATION,
5089 vmSymbols::java_lang_ClassFormatError(),
5090 "Illegal method name \"%.*s\" in class %s", length, bytes,
5091 _class_name->as_C_string()
5092 );
5093 return;
5094 }
5095 }
5096
5097 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5098 const char* const bytes = (const char*)signature->bytes();
5099 const unsigned int length = signature->utf8_length();
5100 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5101
5102 if (p == nullptr || (p - bytes) != (int)length) {
5103 return false;
5104 }
5105 return true;
5106 }
5107
5108 // Checks if signature is a legal field signature.
5109 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5110 const Symbol* signature,
5111 TRAPS) const {
5112 if (!_need_verify) { return; }
5113
5114 if (!legal_field_signature(signature, THREAD)) {
5115 CLEAR_PENDING_EXCEPTION; // throw this exception instead
5116 throwIllegalSignature("Field", name, signature, CHECK);
5117 }
5118 }
5119
5120 // Check that the signature is compatible with the method name. For example,
5121 // check that <init> has a void signature.
5122 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5123 const Symbol* signature,
5124 TRAPS) const {
5125 if (!_need_verify) {
5126 return;
5127 }
5128
5129 // Class initializers cannot have args for class format version >= 51.
5130 if (name == vmSymbols::class_initializer_name() &&
5131 signature != vmSymbols::void_method_signature() &&
5132 _major_version >= JAVA_7_VERSION) {
5133 throwIllegalSignature("Method", name, signature, THREAD);
5134 return;
5135 }
5136
5137 int sig_length = signature->utf8_length();
5138 if (name->utf8_length() > 0 &&
5139 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5140 sig_length > 0 &&
5141 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5142 throwIllegalSignature("Method", name, signature, THREAD);
5143 }
5144 }
5145
5146 // Checks if signature is a legal method signature.
5147 // Returns number of parameters
5148 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5149 const Symbol* signature,
5150 TRAPS) const {
5151 if (!_need_verify) {
5152 // make sure caller's args_size will be less than 0 even for non-static
5153 // method so it will be recomputed in compute_size_of_parameters().
5154 return -2;
5155 }
5156
5157 unsigned int args_size = 0;
5158 const char* p = (const char*)signature->bytes();
5159 unsigned int length = signature->utf8_length();
5160 const char* nextp;
5161
5162 // The first character must be a '('
5163 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5164 length--;
5165 // Skip over legal field signatures
5166 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5167 while ((length > 0) && (nextp != nullptr)) {
5168 args_size++;
5169 if (p[0] == 'J' || p[0] == 'D') {
5170 args_size++;
5171 }
5172 length -= pointer_delta_as_int(nextp, p);
5173 p = nextp;
5174 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5175 }
5176 // The first non-signature thing better be a ')'
5177 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5178 length--;
5179 // Now we better just have a return value
5180 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5181 if (nextp && ((int)length == (nextp - p))) {
5182 return args_size;
5183 }
5184 }
5185 }
5186 // Report error
5187 throwIllegalSignature("Method", name, signature, THREAD);
5188 return 0;
5189 }
5190
5191 int ClassFileParser::static_field_size() const {
5192 assert(_layout_info != nullptr, "invariant");
5193 return _layout_info->_static_field_size;
5194 }
5195
5196 int ClassFileParser::total_oop_map_count() const {
5197 assert(_layout_info != nullptr, "invariant");
5198 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5199 }
5200
5201 jint ClassFileParser::layout_size() const {
5202 assert(_layout_info != nullptr, "invariant");
5203 return _layout_info->_instance_size;
5204 }
5205
5206 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5207 const Array<Method*>* methods) {
5208 assert(ik != nullptr, "invariant");
5209 assert(methods != nullptr, "invariant");
5210
5211 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5212 // (We used to do this lazily, but now we query it in Rewriter,
5213 // which is eagerly done for every method, so we might as well do it now,
5214 // when everything is fresh in memory.)
5215 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5216
5217 if (klass_id != vmSymbolID::NO_SID) {
5218 for (int j = 0; j < methods->length(); ++j) {
5219 Method* method = methods->at(j);
5220 method->init_intrinsic_id(klass_id);
5221
5222 if (CheckIntrinsics) {
5223 // Check if an intrinsic is defined for method 'method',
5224 // but the method is not annotated with @IntrinsicCandidate.
5225 if (method->intrinsic_id() != vmIntrinsics::_none &&
5226 !method->intrinsic_candidate()) {
5227 tty->print("Compiler intrinsic is defined for method [%s], "
5228 "but the method is not annotated with @IntrinsicCandidate.%s",
5229 method->name_and_sig_as_C_string(),
5230 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5231 );
5232 tty->cr();
5233 DEBUG_ONLY(vm_exit(1));
5234 }
5235 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5236 // but there is no intrinsic available for it.
5237 if (method->intrinsic_candidate() &&
5238 method->intrinsic_id() == vmIntrinsics::_none) {
5239 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5240 "but no compiler intrinsic is defined for the method.%s",
5241 method->name_and_sig_as_C_string(),
5242 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5243 );
5244 tty->cr();
5245 DEBUG_ONLY(vm_exit(1));
5246 }
5247 }
5248 } // end for
5249
5250 #ifdef ASSERT
5251 if (CheckIntrinsics) {
5252 // Check for orphan methods in the current class. A method m
5253 // of a class C is orphan if an intrinsic is defined for method m,
5254 // but class C does not declare m.
5255 // The check is potentially expensive, therefore it is available
5256 // only in debug builds.
5257
5258 for (auto id : EnumRange<vmIntrinsicID>{}) {
5259 if (vmIntrinsics::_compiledLambdaForm == id) {
5260 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5261 // generated for the JVM from a LambdaForm and therefore no method
5262 // is defined for it.
5263 continue;
5264 }
5265 if (vmIntrinsics::_blackhole == id) {
5266 // The _blackhole intrinsic is a special marker. No explicit method
5267 // is defined for it.
5268 continue;
5269 }
5270
5271 if (vmIntrinsics::class_for(id) == klass_id) {
5272 // Check if the current class contains a method with the same
5273 // name, flags, signature.
5274 bool match = false;
5275 for (int j = 0; j < methods->length(); ++j) {
5276 const Method* method = methods->at(j);
5277 if (method->intrinsic_id() == id) {
5278 match = true;
5279 break;
5280 }
5281 }
5282
5283 if (!match) {
5284 char buf[1000];
5285 tty->print("Compiler intrinsic is defined for method [%s], "
5286 "but the method is not available in class [%s].%s",
5287 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5288 ik->name()->as_C_string(),
5289 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5290 );
5291 tty->cr();
5292 DEBUG_ONLY(vm_exit(1));
5293 }
5294 }
5295 } // end for
5296 } // CheckIntrinsics
5297 #endif // ASSERT
5298 }
5299 }
5300
5301 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5302 const ClassInstanceInfo& cl_inst_info,
5303 TRAPS) {
5304 if (_klass != nullptr) {
5305 return _klass;
5306 }
5307
5308 InstanceKlass* const ik =
5309 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5310
5311 if (is_hidden()) {
5312 mangle_hidden_class_name(ik);
5313 }
5314
5315 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5316
5317 assert(_klass == ik, "invariant");
5318 return ik;
5319 }
5320
5321 void ClassFileParser::create_acmp_maps(InstanceKlass* ik, TRAPS) {
5322 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5323 // Current format of acmp maps:
5324 // All maps are stored contiguously in a single int array because it might
5325 // be too early to instantiate an Object array (to be investigated)
5326 // Format is:
5327 // [number_of_nonoop_entries][offset0][size0][offset1][size1]...[oop_offset0][oop_offset1]...
5328 // ^ ^
5329 // | |
5330 // --------------------- Pair of integer describing a segment of
5331 // contiguous non-oop fields
5332 // First element is the number of segment of contiguous non-oop fields
5333 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5334 // the offset then the size.
5335 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5336 // per oop field, containing the offset of the field.
5337 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5338 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5339 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1;
5340
5341 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK);
5342 typeArrayHandle map_h(THREAD, map);
5343 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK);
5344
5345 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5346 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length());
5347 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5348 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5349 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5350
5351 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data.
5352 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5353 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5354 }
5355 int oop_map_start = nonoop_acmp_map_size + 1;
5356 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5357 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5358 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5359 }
5360 assert(acmp_maps_array->length() == map_h->length(), "sanity");
5361 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5362 ik->set_acmp_maps_array(acmp_maps_array);
5363 }
5364
5365 // See the declarations of _fast_acmp_offset and _fast_acmp_mask in InlineKlass::Members
5366 // for details about the fast path logic, and the meaning of these values.
5367 void ClassFileParser::set_fast_acmp_members(InlineKlass* vk) const {
5368 if (_layout_info->_oop_acmp_map->length() > 0) { // Oops are not allowed in the fast path
5369 return;
5370 }
5371
5372 int64_t mask = 0;
5373 #ifndef VM_LITTLE_ENDIAN
5374 // Leaving the mask and offset to default values (that is just "return;") is a correct and easy way to implement
5375 // this for other endianness, but it will have a runtime cost in do_acmp, without the benefit. It is better, and
5376 // probably easy with access to such an architecture, to adapt the logic below
5377 // for big-endian architectures, but filling the mask from the other end. I prefer not to do it blindly.
5378 vk->set_fast_acmp_offset(0);
5379 vk->set_fast_acmp_mask(mask);
5380
5381 #else
5382
5383 // Compute the mask for a memory zone with offset "start" and of size "size", both in bytes,
5384 // assuming it won't overflow the long. In little endian, the byte with smallest address/smallest offset/closest from header
5385 // will be the least significant byte.
5386 // Value Memory layout
5387 // make_mask_piece(0, 1) = 0x0000 0000 0000 00ff => ff | 00 | 00 | 00 | 00 | 00 | 00 | 00
5388 // make_mask_piece(0, 1) = 0x0000 0000 0000 ffff => ff | ff | 00 | 00 | 00 | 00 | 00 | 00
5389 // make_mask_piece(1, 1) = 0x0000 0000 0000 ff00 => 00 | ff | 00 | 00 | 00 | 00 | 00 | 00
5390 // make_mask_piece(1, 3) = 0x0000 0000 ffff ff00 => 00 | ff | ff | ff | 00 | 00 | 00 | 00
5391 auto make_mask_piece = [](int start, int size) -> int64_t { return right_n_bits<int64_t>(size * BitsPerByte) << (start * BitsPerByte); };
5392
5393 // We build the mask for a 64-bit load from the start of the payload. For each contiguous piece of memory
5394 // we build the mask containing 1's where it would be in the loaded long: it must be as
5395 // long as the memory that is being accessed, but the placement depends on the endianness.
5396 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5397 int piece_start = _layout_info->_nonoop_acmp_map->at(i)._offset - _layout_info->_payload_offset;
5398 int piece_size = _layout_info->_nonoop_acmp_map->at(i)._size;
5399 int piece_end = piece_start + piece_size - 1;
5400 if (piece_end >= BytesPerLong) { // Too far! Can't fit in an 8-byte load, fast path will not be taken
5401 return;
5402 }
5403 int64_t mask_piece = make_mask_piece(piece_start, piece_size);
5404 mask |= mask_piece;
5405 }
5406
5407 // If the payload is smaller than 64 bits, reading a long after the header can lead to an over-read. To avoid that, we can move the
5408 // load to a lower offset (toward the beginning of the object), and adjust the mask accordingly, even if it means reading (part of)
5409 // the header: the mask will filter that out.
5410 // Since an object cannot be less than 8 bytes, it's surely safe.
5411 if (mask == 0) {
5412 // Special case: empty object. There is nothing to compare, and no payload. We can just read from the start
5413 // of the header to ensure we load within the object. We can't use the general case: count_leading_zeros/count_trailing_zeros doesn't
5414 // accept null argument. This case is endianness-agnostic.
5415 vk->set_fast_acmp_offset(0);
5416 vk->set_fast_acmp_mask(mask);
5417 } else {
5418 // In little endian, if the payload is not a full 64 bits, the mask will have leading 0s (most significant bytes are bytes with
5419 // higher addresses/higher offset/further from the header). We can shift the mask so that there aren't leading 0s anymore, and
5420 // decrease the offset by the same amount.
5421 // For instance, let's say _payload_offset is 16, and the mask is 0x0000 ffff ffff 00ff, we have 16 leading 0s
5422 // (the bubble at offset 1 is fine: it might be due to padding). Reading from the start of the payload might read 2 bytes
5423 // after the end of the payload. To avoid that, we are going to shift the payload by 16 bits, and remove 2 bytes
5424 // from the offset we should load from. At the end, fast_acmp_offset will be 14 and the mask 0xffff ffff 00ff 0000.
5425 // The lowest 16 0s introduced by the shift will filter out the 2 bytes we read from the header.
5426 // Big endian architectures probably need to look at count_trailing_zeros, and shift right until the last bit is 1.
5427 // The offset still needs to be decreased.
5428 int leading_zeroes = static_cast<int>(count_leading_zeros(mask));
5429 assert(leading_zeroes % BitsPerByte == 0, "we should mask full bytes");
5430 mask <<= leading_zeroes;
5431 assert(count_leading_zeros(mask) == 0, "fast acmp mask can be moved further!");
5432 int offset = _layout_info->_payload_offset - leading_zeroes / BitsPerByte;
5433 assert(offset >= 0, "fast acmp path shouldn't load before the object");
5434 vk->set_fast_acmp_offset(offset);
5435 vk->set_fast_acmp_mask(mask);
5436 }
5437 #endif // VM_LITTLE_ENDIAN
5438 }
5439
5440 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5441 bool changed_by_loadhook,
5442 const ClassInstanceInfo& cl_inst_info,
5443 TRAPS) {
5444 assert(ik != nullptr, "invariant");
5445
5446 // Set name and CLD before adding to CLD
5447 ik->set_class_loader_data(_loader_data);
5448 ik->set_class_loader_type();
5449 ik->set_name(_class_name);
5450
5451 // Add all classes to our internal class loader list here,
5452 // including classes in the bootstrap (null) class loader.
5453 const bool publicize = !is_internal();
5454
5455 _loader_data->add_class(ik, publicize);
5456
5457 set_klass_to_deallocate(ik);
5458
5459 assert(_layout_info != nullptr, "invariant");
5460 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5461 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5462 "sanity");
5463
5464 assert(ik->is_instance_klass(), "sanity");
5465 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5466
5467 // Fill in information already parsed
5468 ik->set_should_verify_class(_need_verify);
5469
5470 // Not yet: supers are done below to support the new subtype-checking fields
5471 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5472 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5473 ik->set_has_strict_static_fields(_has_strict_static_fields);
5474
5475 if (_layout_info->_is_naturally_atomic) {
5476 ik->set_is_naturally_atomic();
5477 }
5478
5479 if (_layout_info->_must_be_atomic) {
5480 ik->set_must_be_atomic();
5481 }
5482
5483 ik->set_static_oop_field_count(_static_oop_count);
5484
5485 if (_has_null_restricted_static_fields) {
5486 ik->set_has_null_restricted_static_fields();
5487 for (int i = 0; i < _temp_field_info->length(); i++) {
5488 FieldInfo& fieldinfo = _temp_field_info->at(i);
5489 if (fieldinfo.access_flags().is_static() && fieldinfo.field_flags().is_null_free_inline_type()) {
5490 Symbol* sig = fieldinfo.signature(_cp);
5491 assert(Signature::has_envelope(sig), "Must already have been checked");
5492 TempNewSymbol name = Signature::strip_envelope(sig);
5493 if (name == _class_name) {
5494 // Replace the nullptr previously stored now that we have the InstanceKlass for this klass.
5495 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(ik));
5496 }
5497 assert(_inline_layout_info_array->adr_at(fieldinfo.index())->klass()->is_inline_klass(), "Must be");
5498 }
5499 }
5500 }
5501
5502 // this transfers ownership of a lot of arrays from
5503 // the parser onto the InstanceKlass*
5504 apply_parsed_class_metadata(ik, _java_fields_count);
5505
5506 // can only set dynamic nest-host after static nest information is set
5507 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5508 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5509 }
5510
5511 // note that is not safe to use the fields in the parser from this point on
5512 assert(nullptr == _cp, "invariant");
5513 assert(nullptr == _fieldinfo_stream, "invariant");
5514 assert(nullptr == _fieldinfo_search_table, "invariant");
5515 assert(nullptr == _fields_status, "invariant");
5516 assert(nullptr == _methods, "invariant");
5517 assert(nullptr == _inner_classes, "invariant");
5518 assert(nullptr == _nest_members, "invariant");
5519 assert(nullptr == _loadable_descriptors, "invariant");
5520 assert(nullptr == _combined_annotations, "invariant");
5521 assert(nullptr == _record_components, "invariant");
5522 assert(nullptr == _permitted_subclasses, "invariant");
5523 assert(nullptr == _inline_layout_info_array, "invariant");
5524
5525 if (_has_localvariable_table) {
5526 ik->set_has_localvariable_table(true);
5527 }
5528
5529 if (_has_final_method) {
5530 ik->set_has_final_method();
5531 }
5532
5533 ik->copy_method_ordering(_method_ordering, CHECK);
5534 // The InstanceKlass::_methods_jmethod_ids cache
5535 // is managed on the assumption that the initial cache
5536 // size is equal to the number of methods in the class. If
5537 // that changes, then InstanceKlass::idnum_can_increment()
5538 // has to be changed accordingly.
5539 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5540
5541 ik->set_this_class_index(_this_class_index);
5542
5543 if (_is_hidden) {
5544 // _this_class_index is a CONSTANT_Class entry that refers to this
5545 // hidden class itself. If this class needs to refer to its own methods
5546 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5547 // _this_class_index. However, because this class is hidden (it's
5548 // not stored in SystemDictionary), _this_class_index cannot be resolved
5549 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5550 // Therefore, we must eagerly resolve _this_class_index now.
5551 ik->constants()->klass_at_put(_this_class_index, ik);
5552 }
5553
5554 ik->set_minor_version(_minor_version);
5555 ik->set_major_version(_major_version);
5556 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5557 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5558
5559 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5560
5561 // Set PackageEntry for this_klass
5562 oop cl = ik->class_loader();
5563 Handle clh = Handle(THREAD, cl);
5564 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5565 ik->set_package(cld, nullptr, CHECK);
5566
5567 const Array<Method*>* const methods = ik->methods();
5568 assert(methods != nullptr, "invariant");
5569 const int methods_len = methods->length();
5570
5571 check_methods_for_intrinsics(ik, methods);
5572
5573 // Fill in field values obtained by parse_classfile_attributes
5574 if (_parsed_annotations->has_any_annotations())
5575 _parsed_annotations->apply_to(ik);
5576
5577 apply_parsed_class_attributes(ik);
5578
5579 // Miranda methods
5580 if ((_num_miranda_methods > 0) ||
5581 // if this class introduced new miranda methods or
5582 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5583 // super class exists and this class inherited miranda methods
5584 ) {
5585 ik->set_has_miranda_methods(); // then set a flag
5586 }
5587
5588 // Fill in information needed to compute superclasses.
5589 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5590 ik->set_transitive_interfaces(_transitive_interfaces);
5591 ik->set_local_interfaces(_local_interfaces);
5592 _transitive_interfaces = nullptr;
5593 _local_interfaces = nullptr;
5594
5595 // Initialize itable offset tables
5596 klassItable::setup_itable_offset_table(ik);
5597
5598 // Compute transitive closure of interfaces this class implements
5599 // Do final class setup
5600 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5601 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5602 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5603 }
5604
5605 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5606 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5607 ik->set_has_contended_annotations(true);
5608 }
5609
5610 // Fill in has_finalizer and layout_helper
5611 set_precomputed_flags(ik);
5612
5613 // check if this class can access its super class
5614 check_super_class_access(ik, CHECK);
5615
5616 // check if this class can access its superinterfaces
5617 check_super_interface_access(ik, CHECK);
5618
5619 // check if this class overrides any final method
5620 check_final_method_override(ik, CHECK);
5621
5622 // reject static interface methods prior to Java 8
5623 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5624 check_illegal_static_method(ik, CHECK);
5625 }
5626
5627 // Obtain this_klass' module entry
5628 ModuleEntry* module_entry = ik->module();
5629 assert(module_entry != nullptr, "module_entry should always be set");
5630
5631 // Obtain java.lang.Module
5632 Handle module_handle(THREAD, module_entry->module_oop());
5633
5634 // Allocate mirror and initialize static fields
5635 java_lang_Class::create_mirror(ik,
5636 Handle(THREAD, _loader_data->class_loader()),
5637 module_handle,
5638 _protection_domain,
5639 cl_inst_info.class_data(),
5640 CHECK);
5641
5642 assert(_all_mirandas != nullptr, "invariant");
5643
5644 // Generate any default methods - default methods are public interface methods
5645 // that have a default implementation. This is new with Java 8.
5646 if (_has_nonstatic_concrete_methods) {
5647 DefaultMethods::generate_default_methods(ik,
5648 _all_mirandas,
5649 CHECK);
5650 }
5651
5652 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5653 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5654 !module_entry->has_default_read_edges()) {
5655 if (!module_entry->set_has_default_read_edges()) {
5656 // We won a potential race
5657 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5658 }
5659 }
5660
5661 if (is_inline_type()) {
5662 InlineKlass* vk = InlineKlass::cast(ik);
5663 vk->set_payload_alignment(_layout_info->_payload_alignment);
5664 vk->set_payload_offset(_layout_info->_payload_offset);
5665 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5666 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5667 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5668 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5669 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5670 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5671 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5672 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5673 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5674
5675 if (UseAcmpFastPath) {
5676 set_fast_acmp_members(vk);
5677 }
5678
5679 vk->initialize_calling_convention(CHECK);
5680 }
5681
5682 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5683 && _class_name != vmSymbols::java_lang_Object()) {
5684 // Both abstract and concrete value classes need a field map for acmp
5685 create_acmp_maps(ik, CHECK);
5686 }
5687
5688 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5689
5690 if (!is_internal()) {
5691 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5692 if (CDSConfig::is_dumping_archive()) {
5693 SystemDictionaryShared::check_code_source(ik, _stream);
5694 }
5695
5696 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5697 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5698 log_is_enabled(Info, class, preview)) {
5699 ResourceMark rm;
5700 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5701 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5702 }
5703
5704 if (log_is_enabled(Debug, class, resolve)) {
5705 ResourceMark rm;
5706 // print out the superclass.
5707 const char * from = ik->external_name();
5708 if (ik->super() != nullptr) {
5709 log_debug(class, resolve)("%s %s (super)",
5710 from,
5711 ik->super()->external_name());
5712 }
5713 // print out each of the interface classes referred to by this class.
5714 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5715 if (local_interfaces != nullptr) {
5716 const int length = local_interfaces->length();
5717 for (int i = 0; i < length; i++) {
5718 const InstanceKlass* const k = local_interfaces->at(i);
5719 const char * to = k->external_name();
5720 log_debug(class, resolve)("%s %s (interface)", from, to);
5721 }
5722 }
5723 }
5724 }
5725
5726 // If we reach here, all is well.
5727 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5728 // in order for it to not be destroyed in the ClassFileParser destructor.
5729 set_klass_to_deallocate(nullptr);
5730
5731 // it's official
5732 set_klass(ik);
5733
5734 DEBUG_ONLY(ik->verify();)
5735 }
5736
5737 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5738 // Decrement the refcount in the old name, since we're clobbering it.
5739 _class_name->decrement_refcount();
5740
5741 _class_name = new_class_name;
5742 // Increment the refcount of the new name.
5743 // Now the ClassFileParser owns this name and will decrement in
5744 // the destructor.
5745 _class_name->increment_refcount();
5746 }
5747
5748 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5749 Symbol* name,
5750 ClassLoaderData* loader_data,
5751 const ClassLoadInfo* cl_info,
5752 Publicity pub_level,
5753 TRAPS) :
5754 _stream(stream),
5755 _class_name(nullptr),
5756 _loader_data(loader_data),
5757 _is_hidden(cl_info->is_hidden()),
5758 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5759 _orig_cp_size(0),
5760 _static_oop_count(0),
5761 _super_klass(),
5762 _cp(nullptr),
5763 _fieldinfo_stream(nullptr),
5764 _fieldinfo_search_table(nullptr),
5765 _fields_status(nullptr),
5766 _methods(nullptr),
5767 _inner_classes(nullptr),
5768 _nest_members(nullptr),
5769 _nest_host(0),
5770 _permitted_subclasses(nullptr),
5771 _loadable_descriptors(nullptr),
5772 _record_components(nullptr),
5773 _local_interfaces(nullptr),
5774 _transitive_interfaces(nullptr),
5775 _combined_annotations(nullptr),
5776 _class_annotations(nullptr),
5777 _class_type_annotations(nullptr),
5778 _fields_annotations(nullptr),
5779 _fields_type_annotations(nullptr),
5780 _klass(nullptr),
5781 _klass_to_deallocate(nullptr),
5782 _parsed_annotations(nullptr),
5783 _layout_info(nullptr),
5784 _inline_layout_info_array(nullptr),
5785 _temp_field_info(nullptr),
5786 _method_ordering(nullptr),
5787 _all_mirandas(nullptr),
5788 _vtable_size(0),
5789 _itable_size(0),
5790 _num_miranda_methods(0),
5791 _protection_domain(cl_info->protection_domain()),
5792 _access_flags(),
5793 _pub_level(pub_level),
5794 _bad_constant_seen(0),
5795 _synthetic_flag(false),
5796 _sde_length(false),
5797 _sde_buffer(nullptr),
5798 _sourcefile_index(0),
5799 _generic_signature_index(0),
5800 _major_version(0),
5801 _minor_version(0),
5802 _this_class_index(0),
5803 _super_class_index(0),
5804 _itfs_len(0),
5805 _java_fields_count(0),
5806 _need_verify(false),
5807 _has_nonstatic_concrete_methods(false),
5808 _declares_nonstatic_concrete_methods(false),
5809 _has_localvariable_table(false),
5810 _has_final_method(false),
5811 _has_contended_fields(false),
5812 _has_aot_runtime_setup_method(false),
5813 _has_strict_static_fields(false),
5814 _has_null_restricted_static_fields(false),
5815 _must_be_atomic(true),
5816 _has_finalizer(false),
5817 _has_empty_finalizer(false),
5818 _max_bootstrap_specifier_index(-1) {
5819
5820 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5821 _class_name->increment_refcount();
5822
5823 assert(_loader_data != nullptr, "invariant");
5824 assert(stream != nullptr, "invariant");
5825 assert(_stream != nullptr, "invariant");
5826 assert(_stream->buffer() == _stream->current(), "invariant");
5827 assert(_class_name != nullptr, "invariant");
5828 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5829
5830 // Figure out whether we can skip format checking (matching classic VM behavior)
5831 // Always verify CFLH bytes from the user agents.
5832 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5833
5834 // synch back verification state to stream to check for truncation.
5835 stream->set_need_verify(_need_verify);
5836
5837 parse_stream(stream, CHECK);
5838
5839 post_process_parsed_stream(stream, _cp, CHECK);
5840 }
5841
5842 void ClassFileParser::clear_class_metadata() {
5843 // metadata created before the instance klass is created. Must be
5844 // deallocated if classfile parsing returns an error.
5845 _cp = nullptr;
5846 _fieldinfo_stream = nullptr;
5847 _fieldinfo_search_table = nullptr;
5848 _fields_status = nullptr;
5849 _methods = nullptr;
5850 _inner_classes = nullptr;
5851 _nest_members = nullptr;
5852 _permitted_subclasses = nullptr;
5853 _loadable_descriptors = nullptr;
5854 _combined_annotations = nullptr;
5855 _class_annotations = _class_type_annotations = nullptr;
5856 _fields_annotations = _fields_type_annotations = nullptr;
5857 _record_components = nullptr;
5858 _inline_layout_info_array = nullptr;
5859 }
5860
5861 // Destructor to clean up
5862 ClassFileParser::~ClassFileParser() {
5863 _class_name->decrement_refcount();
5864
5865 if (_cp != nullptr) {
5866 MetadataFactory::free_metadata(_loader_data, _cp);
5867 }
5868
5869 if (_fieldinfo_stream != nullptr) {
5870 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5871 }
5872 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5873
5874 if (_fields_status != nullptr) {
5875 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5876 }
5877
5878 if (_inline_layout_info_array != nullptr) {
5879 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5880 }
5881
5882 if (_methods != nullptr) {
5883 // Free methods
5884 InstanceKlass::deallocate_methods(_loader_data, _methods);
5885 }
5886
5887 // beware of the Universe::empty_blah_array!!
5888 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5889 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5890 }
5891
5892 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5893 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5894 }
5895
5896 if (_record_components != nullptr) {
5897 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5898 }
5899
5900 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5901 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5902 }
5903
5904 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5905 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5906 }
5907
5908 // Free interfaces
5909 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5910 _local_interfaces, _transitive_interfaces);
5911
5912 if (_combined_annotations != nullptr) {
5913 // After all annotations arrays have been created, they are installed into the
5914 // Annotations object that will be assigned to the InstanceKlass being created.
5915
5916 // Deallocate the Annotations object and the installed annotations arrays.
5917 _combined_annotations->deallocate_contents(_loader_data);
5918
5919 // If the _combined_annotations pointer is non-null,
5920 // then the other annotations fields should have been cleared.
5921 assert(_class_annotations == nullptr, "Should have been cleared");
5922 assert(_class_type_annotations == nullptr, "Should have been cleared");
5923 assert(_fields_annotations == nullptr, "Should have been cleared");
5924 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5925 } else {
5926 // If the annotations arrays were not installed into the Annotations object,
5927 // then they have to be deallocated explicitly.
5928 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5929 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5930 Annotations::free_contents(_loader_data, _fields_annotations);
5931 Annotations::free_contents(_loader_data, _fields_type_annotations);
5932 }
5933
5934 clear_class_metadata();
5935 _transitive_interfaces = nullptr;
5936 _local_interfaces = nullptr;
5937
5938 // deallocate the klass if already created. Don't directly deallocate, but add
5939 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5940 // at a safepoint.
5941 if (_klass_to_deallocate != nullptr) {
5942 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5943 }
5944 }
5945
5946 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5947 TRAPS) {
5948
5949 assert(stream != nullptr, "invariant");
5950 assert(_class_name != nullptr, "invariant");
5951
5952 // BEGIN STREAM PARSING
5953 stream->guarantee_more(8, CHECK); // magic, major, minor
5954 // Magic value
5955 const u4 magic = stream->get_u4_fast();
5956 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5957 "Incompatible magic value %u in class file %s",
5958 magic, CHECK);
5959
5960 // Version numbers
5961 _minor_version = stream->get_u2_fast();
5962 _major_version = stream->get_u2_fast();
5963
5964 // Check version numbers - we check this even with verifier off
5965 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5966
5967 stream->guarantee_more(3, CHECK); // length, first cp tag
5968 u2 cp_size = stream->get_u2_fast();
5969
5970 guarantee_property(
5971 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5972 cp_size, CHECK);
5973
5974 _orig_cp_size = cp_size;
5975 if (is_hidden()) { // Add a slot for hidden class name.
5976 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK);
5977 cp_size++;
5978 }
5979
5980 _cp = ConstantPool::allocate(_loader_data,
5981 cp_size,
5982 CHECK);
5983
5984 ConstantPool* const cp = _cp;
5985
5986 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5987
5988 assert(cp_size == (u2)cp->length(), "invariant");
5989
5990 // ACCESS FLAGS
5991 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5992
5993 // Access flags
5994 u2 flags;
5995 // JVM_ACC_MODULE is defined in JDK-9 and later.
5996 if (_major_version >= JAVA_9_VERSION) {
5997 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5998 } else {
5999 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6000 }
6001
6002 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6003 // Set abstract bit for old class files for backward compatibility
6004 flags |= JVM_ACC_ABSTRACT;
6005 }
6006
6007 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
6008 if (!supports_inline_types()) {
6009 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6010 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6011 if (!is_module && !is_interface) {
6012 flags |= JVM_ACC_IDENTITY;
6013 }
6014 }
6015
6016 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
6017
6018 short bad_constant = class_bad_constant_seen();
6019 if (bad_constant != 0) {
6020 // Do not throw CFE until after the access_flags are checked because if
6021 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6022 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6023 return;
6024 }
6025
6026 _access_flags.set_flags(flags);
6027
6028 // This class and superclass
6029 _this_class_index = stream->get_u2_fast();
6030 guarantee_property(
6031 valid_cp_range(_this_class_index, cp_size) &&
6032 cp->tag_at(_this_class_index).is_unresolved_klass(),
6033 "Invalid this class index %u in constant pool in class file %s",
6034 _this_class_index, CHECK);
6035
6036 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6037 assert(class_name_in_cp != nullptr, "class_name can't be null");
6038
6039 // Don't need to check whether this class name is legal or not.
6040 // It has been checked when constant pool is parsed.
6041 // However, make sure it is not an array type.
6042 if (_need_verify) {
6043 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6044 "Bad class name in class file %s",
6045 CHECK);
6046 }
6047
6048 #ifdef ASSERT
6049 // Basic sanity checks
6050 if (_is_hidden) {
6051 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6052 }
6053 #endif
6054
6055 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
6056
6057 if (_is_hidden) {
6058 assert(_class_name != nullptr, "Unexpected null _class_name");
6059 #ifdef ASSERT
6060 if (_need_verify) {
6061 verify_legal_class_name(_class_name, CHECK);
6062 }
6063 #endif
6064
6065 } else {
6066 // Check if name in class file matches given name
6067 if (_class_name != class_name_in_cp) {
6068 if (_class_name != vmSymbols::unknown_class_name()) {
6069 ResourceMark rm(THREAD);
6070 // Names are all known to be < 64k so we know this formatted message is not excessively large.
6071 Exceptions::fthrow(THREAD_AND_LOCATION,
6072 vmSymbols::java_lang_NoClassDefFoundError(),
6073 "%s (wrong name: %s)",
6074 _class_name->as_C_string(),
6075 class_name_in_cp->as_C_string()
6076 );
6077 return;
6078 } else {
6079 // The class name was not known by the caller so we set it from
6080 // the value in the CP.
6081 update_class_name(class_name_in_cp);
6082 }
6083 // else nothing to do: the expected class name matches what is in the CP
6084 }
6085 }
6086
6087 // Verification prevents us from creating names with dots in them, this
6088 // asserts that that's the case.
6089 assert(is_internal_format(_class_name), "external class name format used internally");
6090
6091 if (!is_internal()) {
6092 LogTarget(Debug, class, preorder) lt;
6093 if (lt.is_enabled()){
6094 ResourceMark rm(THREAD);
6095 LogStream ls(lt);
6096 ls.print("%s", _class_name->as_klass_external_name());
6097 if (stream->source() != nullptr) {
6098 ls.print(" source: %s", stream->source());
6099 }
6100 ls.cr();
6101 }
6102 }
6103
6104 // SUPERKLASS
6105 _super_class_index = stream->get_u2_fast();
6106 check_super_class(cp,
6107 _super_class_index,
6108 _need_verify,
6109 CHECK);
6110
6111 // Interfaces
6112 _itfs_len = stream->get_u2_fast();
6113 parse_interfaces(stream,
6114 _itfs_len,
6115 cp,
6116 &_has_nonstatic_concrete_methods,
6117 CHECK);
6118
6119 assert(_local_interfaces != nullptr, "invariant");
6120
6121 // Fields (offsets are filled in later)
6122 parse_fields(stream,
6123 _access_flags,
6124 cp,
6125 cp_size,
6126 &_java_fields_count,
6127 CHECK);
6128
6129 assert(_temp_field_info != nullptr, "invariant");
6130
6131 // Methods
6132 parse_methods(stream,
6133 _access_flags.is_interface(),
6134 &_has_localvariable_table,
6135 &_has_final_method,
6136 &_declares_nonstatic_concrete_methods,
6137 CHECK);
6138
6139 assert(_methods != nullptr, "invariant");
6140
6141 if (_declares_nonstatic_concrete_methods) {
6142 _has_nonstatic_concrete_methods = true;
6143 }
6144
6145 // Additional attributes/annotations
6146 _parsed_annotations = new ClassAnnotationCollector();
6147 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6148
6149 assert(_inner_classes != nullptr, "invariant");
6150
6151 // Finalize the Annotations metadata object,
6152 // now that all annotation arrays have been created.
6153 create_combined_annotations(CHECK);
6154
6155 // Make sure this is the end of class file stream
6156 guarantee_property(stream->at_eos(),
6157 "Extra bytes at the end of class file %s",
6158 CHECK);
6159
6160 // all bytes in stream read and parsed
6161 }
6162
6163 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6164 ResourceMark rm;
6165 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6166 // use a '/' because that confuses finding the class's package. Also, can't
6167 // use an illegal char such as ';' because that causes serialization issues
6168 // and issues with hidden classes that create their own hidden classes.
6169 char addr_buf[20];
6170 if (CDSConfig::is_dumping_static_archive()) {
6171 // We want stable names for the archived hidden classes (only for static
6172 // archive for now). Spaces under default_SharedBaseAddress() will be
6173 // occupied by the archive at run time, so we know that no dynamically
6174 // loaded InstanceKlass will be placed under there.
6175 static volatile size_t counter = 0;
6176 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6177 size_t new_id = AtomicAccess::add(&counter, (size_t)1);
6178 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
6179 } else {
6180 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6181 }
6182 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6183 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6184 jio_snprintf(new_name, new_name_len, "%s+%s",
6185 _class_name->as_C_string(), addr_buf);
6186 update_class_name(SymbolTable::new_symbol(new_name));
6187
6188 // Add a Utf8 entry containing the hidden name.
6189 assert(_class_name != nullptr, "Unexpected null _class_name");
6190 int hidden_index = _orig_cp_size; // this is an extra slot we added
6191 _cp->symbol_at_put(hidden_index, _class_name);
6192
6193 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6194 // We have to update the resolved_klass_index and the name_index together
6195 // so extract the existing resolved_klass_index first.
6196 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6197 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6198 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6199 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6200 "Bad name_index");
6201 }
6202
6203 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6204 ConstantPool* cp,
6205 TRAPS) {
6206 assert(stream != nullptr, "invariant");
6207 assert(stream->at_eos(), "invariant");
6208 assert(cp != nullptr, "invariant");
6209 assert(_loader_data != nullptr, "invariant");
6210
6211 if (_class_name == vmSymbols::java_lang_Object()) {
6212 precond(_super_class_index == 0);
6213 precond(_super_klass == nullptr);
6214 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6215 "java.lang.Object cannot implement an interface in class file %s",
6216 CHECK);
6217 } else {
6218 // Set _super_klass after class file is parsed and format is checked
6219 assert(_super_class_index > 0, "any class other than Object must have a super class");
6220 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6221 if (_access_flags.is_interface()) {
6222 // Before attempting to resolve the superclass, check for class format
6223 // errors not checked yet.
6224 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6225 "Interfaces must have java.lang.Object as superclass in class file %s",
6226 CHECK);
6227 }
6228 Handle loader(THREAD, _loader_data->class_loader());
6229 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6230 // fast path to avoid lookup
6231 _super_klass = vmClasses::Object_klass();
6232 } else {
6233 _super_klass = (const InstanceKlass*)
6234 SystemDictionary::resolve_super_or_fail(_class_name,
6235 super_class_name,
6236 loader,
6237 true,
6238 CHECK);
6239 }
6240 }
6241
6242 if (_super_klass != nullptr) {
6243 if (_super_klass->is_interface()) {
6244 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6245 return;
6246 }
6247
6248 if (_super_klass->is_final()) {
6249 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6250 return;
6251 }
6252
6253 if (Arguments::is_valhalla_enabled()) {
6254 // If this class is a value class, its super class cannot be an identity class unless it is java.lang.Object.
6255 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() &&
6256 _super_klass != vmClasses::Object_klass()) {
6257 ResourceMark rm(THREAD);
6258 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6259 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string()));
6260 }
6261 }
6262
6263 if (_super_klass->has_nonstatic_concrete_methods()) {
6264 _has_nonstatic_concrete_methods = true;
6265 }
6266 }
6267
6268 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6269 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6270 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6271 _class_name->as_klass_external_name()));
6272 }
6273
6274 // Determining if the class allows tearing or not (default is not)
6275 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6276 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6277 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6278 // Conditions above are not sufficient to determine atomicity requirements.
6279 // Fields with atomicity requirements could force the current class to have atomicity requirements too.
6280 // Mark as not needing atomicity for now - can be updated when computing the fields layout.
6281 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6282 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6283 _must_be_atomic = false;
6284 }
6285 // Apply VM options override
6286 if (*ForceNonTearable != '\0') {
6287 // Allow a command line switch to force the same atomicity property:
6288 ResourceMark rm(THREAD);
6289 const char* class_name_str = _class_name->as_C_string();
6290 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6291 _must_be_atomic = true;
6292 }
6293 }
6294 }
6295
6296 // Compute the transitive list of all unique interfaces implemented by this class
6297 _transitive_interfaces =
6298 compute_transitive_interfaces(_super_klass,
6299 _local_interfaces,
6300 _loader_data,
6301 CHECK);
6302
6303 assert(_transitive_interfaces != nullptr, "invariant");
6304
6305 // sort methods
6306 _method_ordering = sort_methods(_methods);
6307
6308 _all_mirandas = new GrowableArray<Method*>(20);
6309
6310 Handle loader(THREAD, _loader_data->class_loader());
6311 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6312 &_num_miranda_methods,
6313 _all_mirandas,
6314 _super_klass,
6315 _methods,
6316 _access_flags,
6317 _major_version,
6318 loader,
6319 _class_name,
6320 _local_interfaces);
6321
6322 // Size of Java itable (in words)
6323 _itable_size = is_interface() ? 0 :
6324 klassItable::compute_itable_size(_transitive_interfaces);
6325
6326 assert(_parsed_annotations != nullptr, "invariant");
6327
6328 if (Arguments::is_valhalla_enabled()) {
6329 fetch_field_classes(cp, CHECK);
6330 }
6331
6332 _layout_info = new FieldLayoutInfo();
6333 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6334 _parsed_annotations->is_contended(), is_inline_type(),
6335 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6336 _must_be_atomic, _layout_info, _inline_layout_info_array);
6337 lb.build_layout();
6338
6339 // If it turned out that we didn't inline any of the fields, we deallocate
6340 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6341 // transferred to the allocated InstanceKlass.
6342 if (_inline_layout_info_array != nullptr && !(_layout_info->_has_inlined_fields || _has_null_restricted_static_fields)) {
6343 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6344 _inline_layout_info_array = nullptr;
6345 }
6346
6347 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6348 _fieldinfo_stream =
6349 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6350 injected_fields_count, loader_data(), CHECK);
6351 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6352 _fields_status =
6353 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6354 FieldStatus(0), CHECK);
6355
6356 // Strict static fields track initialization status from the beginning of time.
6357 // After this class runs <clinit>, they will be verified as being "not unset".
6358 // See Step 8 of InstanceKlass::initialize_impl.
6359 if (_has_strict_static_fields) {
6360 bool found_one = false;
6361 for (int i = 0; i < _temp_field_info->length(); i++) {
6362 FieldInfo& fi = *_temp_field_info->adr_at(i);
6363 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6364 found_one = true;
6365 if (fi.initializer_index() != 0) {
6366 // skip strict static fields with ConstantValue attributes
6367 } else {
6368 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6369 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6370 }
6371 }
6372 }
6373 assert(found_one == _has_strict_static_fields,
6374 "correct prediction = %d", (int)_has_strict_static_fields);
6375 }
6376 }
6377
6378 // In order to be able to optimize field layouts by applying heap flattening,
6379 // the JVM needs to know the layout of the class of the fields, which implies
6380 // having these classes loaded. The strategy has two folds:
6381 // 1 - if the current class has a LoadableDescriptors attribute containing the
6382 // name of the class of the field and PreloadClasses is true, the JVM will
6383 // try to speculatively load this class. Failures to load the class are
6384 // silently discarded, and loads resulting in a non-optimizable class
6385 // are ignored
6386 // 2 - if step 1 cannot be applied, the JVM will simply check if the class
6387 // loader of the current class already knows these classes (no class
6388 // loading triggered in this case). Note that the migrated value classes
6389 // of the JDK are automatically registered to all class loaders, and
6390 // are guaranteed to be found in this step even if the current class
6391 // has not been recompiled with JEP 401 features enabled
6392 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) {
6393 for (int i = 0; i < _temp_field_info->length(); i++) {
6394 FieldInfo& fieldinfo = _temp_field_info->at(i);
6395 if (fieldinfo.access_flags().is_static() && !fieldinfo.field_flags().is_null_free_inline_type()) continue;
6396 Symbol* sig = fieldinfo.signature(cp);
6397 if (Signature::has_envelope(sig)) {
6398 TempNewSymbol name = Signature::strip_envelope(sig);
6399 if (name == _class_name) {
6400 if (fieldinfo.field_flags().is_null_free_inline_type() && !is_inline_type()) {
6401 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6402 } else {
6403 // Dummy setting to trigger the allocation of the inline_layout_info array -
6404 // the real pointer will be set later in ::fill_instance_klass, once the InlineKlass has been allocated.
6405 set_inline_layout_info_klass(fieldinfo.index(), nullptr, CHECK);
6406 }
6407 continue;
6408 }
6409 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) {
6410 ResourceMark rm(THREAD);
6411 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6412 "Cause: field type in LoadableDescriptors attribute",
6413 name->as_C_string(), _class_name->as_C_string());
6414 oop loader = loader_data()->class_loader();
6415 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6416 Handle(THREAD, loader),
6417 false, THREAD);
6418
6419 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6420
6421 if (klass != nullptr) {
6422 if (klass->is_inline_klass()) {
6423 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6424 log_info(class, preload)("Preloading of class %s during loading of class %s "
6425 "(cause: field type in LoadableDescriptors attribute) succeeded",
6426 name->as_C_string(), _class_name->as_C_string());
6427 } else {
6428 // Non value classes are allowed by the current spec, but it could be an indication of an issue so let's log this
6429 log_info(class, preload)("Preloading of class %s during loading of class %s "
6430 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6431 name->as_C_string(), _class_name->as_C_string());
6432 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6433 log_warning(class, preload)("After preloading of class %s during loading of class %s "
6434 "field was annotated with @NullRestricted but loaded class is not a value class, "
6435 "the annotation is ignored",
6436 name->as_C_string(), _class_name->as_C_string());
6437 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6438 }
6439 }
6440 } else {
6441 log_info(class, preload)("Preloading of class %s during loading of class %s "
6442 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6443 name->as_C_string(), _class_name->as_C_string(),
6444 PENDING_EXCEPTION->klass()->name()->as_C_string());
6445 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6446 log_warning(class, preload)("After preloading of class %s during loading of class %s failed,"
6447 "field was annotated with @NullRestricted but class is unknown, "
6448 "the annotation is ignored",
6449 name->as_C_string(), _class_name->as_C_string());
6450 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6451 }
6452
6453 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6454 // impact loading of current class.
6455 CLEAR_PENDING_EXCEPTION;
6456 }
6457 } else {
6458 oop loader = loader_data()->class_loader();
6459 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6460 if (klass != nullptr && klass->is_inline_klass()) {
6461 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6462 ResourceMark rm(THREAD);
6463 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary"
6464 "(field type not in LoadableDescriptors attribute)",
6465 _class_name->as_C_string(), name->as_C_string());
6466 } else if (fieldinfo.field_flags().is_null_free_inline_type()) {
6467 ResourceMark rm(THREAD);
6468 if (klass == nullptr) {
6469 log_warning(class, preload)("During loading of class %s, class %s is unknown, "
6470 "but a field of this type was annotated with @NullRestricted, "
6471 "the annotation is ignored",
6472 _class_name->as_C_string(), name->as_C_string());
6473 } else {
6474 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary "
6475 "and is not a concrete value class, but a field of this type was annotated with "
6476 "@NullRestricted, the annotation is ignored",
6477 _class_name->as_C_string(), name->as_C_string());
6478 }
6479 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6480 }
6481 }
6482 }
6483 }
6484 }
6485
6486 void ClassFileParser::set_klass(InstanceKlass* klass) {
6487
6488 #ifdef ASSERT
6489 if (klass != nullptr) {
6490 assert(nullptr == _klass, "leaking?");
6491 }
6492 #endif
6493
6494 _klass = klass;
6495 }
6496
6497 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6498 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6499
6500 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6501 // never allocated for an InstanceKlass which has no need for this information.
6502 if (_inline_layout_info_array == nullptr) {
6503 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6504 java_fields_count(),
6505 CHECK);
6506 }
6507
6508 // Set the Klass for the field's index
6509 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6510 }
6511
6512 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6513
6514 #ifdef ASSERT
6515 if (klass != nullptr) {
6516 assert(nullptr == _klass_to_deallocate, "leaking?");
6517 }
6518 #endif
6519
6520 _klass_to_deallocate = klass;
6521 }
6522
6523 // Caller responsible for ResourceMark
6524 // clone stream with rewound position
6525 const ClassFileStream* ClassFileParser::clone_stream() const {
6526 assert(_stream != nullptr, "invariant");
6527
6528 return _stream->clone();
6529 }
6530
6531 ReferenceType ClassFileParser::super_reference_type() const {
6532 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6533 }
6534
6535 bool ClassFileParser::is_instance_ref_klass() const {
6536 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6537 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6538 // klass requiring special treatment in ref-processing. The abstract
6539 // j.l.r.Reference cannot be instantiated so doesn't partake in
6540 // ref-processing.
6541 return is_java_lang_ref_Reference_subclass();
6542 }
6543
6544 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6545 if (_super_klass == nullptr) {
6546 return false;
6547 }
6548
6549 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6550 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6551 return true;
6552 }
6553
6554 return _super_klass->reference_type() != REF_NONE;
6555 }
6556
6557 // ----------------------------------------------------------------------------
6558 // debugging
6559
6560 #ifdef ASSERT
6561
6562 // return true if class_name contains no '.' (internal format is '/')
6563 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6564 if (class_name != nullptr) {
6565 ResourceMark rm;
6566 char* name = class_name->as_C_string();
6567 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6568 } else {
6569 return true;
6570 }
6571 }
6572
6573 #endif