1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cdsConfig.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/classLoadInfo.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/fieldLayoutBuilder.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "jvm.h"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/bsmAttribute.inline.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/inlineKlass.inline.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/klassVtable.hpp"
60 #include "oops/metadata.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiThreadState.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/fieldDescriptor.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/safepointVerifiers.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/timer.hpp"
77 #include "services/classLoadingService.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/bitMap.inline.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/exceptions.hpp"
84 #include "utilities/formatBuffer.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/hashTable.hpp"
88 #include "utilities/macros.hpp"
89 #include "utilities/ostream.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95
96 // We generally try to create the oops directly when parsing, rather than
97 // allocating temporary data structures and copying the bytes twice. A
98 // temporary area is only needed when parsing utf8 entries in the constant
99 // pool and when parsing line number tables.
100
101 // We add assert in debug mode when class format is not checked.
102
103 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
104 #define JAVA_MIN_SUPPORTED_VERSION 45
105 #define JAVA_PREVIEW_MINOR_VERSION 65535
106
107 // Used for two backward compatibility reasons:
108 // - to check for new additions to the class file format in JDK1.5
109 // - to check for bug fixes in the format checker in JDK1.5
110 #define JAVA_1_5_VERSION 49
111
112 // Used for backward compatibility reasons:
113 // - to check for javac bug fixes that happened after 1.5
114 // - also used as the max version when running in jdk6
115 #define JAVA_6_VERSION 50
116
117 // Used for backward compatibility reasons:
118 // - to disallow argument and require ACC_STATIC for <clinit> methods
119 #define JAVA_7_VERSION 51
120
121 // Extension method support.
122 #define JAVA_8_VERSION 52
123
124 #define JAVA_9_VERSION 53
125
126 #define JAVA_10_VERSION 54
127
128 #define JAVA_11_VERSION 55
129
130 #define JAVA_12_VERSION 56
131
132 #define JAVA_13_VERSION 57
133
134 #define JAVA_14_VERSION 58
135
136 #define JAVA_15_VERSION 59
137
138 #define JAVA_16_VERSION 60
139
140 #define JAVA_17_VERSION 61
141
142 #define JAVA_18_VERSION 62
143
144 #define JAVA_19_VERSION 63
145
146 #define JAVA_20_VERSION 64
147
148 #define JAVA_21_VERSION 65
149
150 #define JAVA_22_VERSION 66
151
152 #define JAVA_23_VERSION 67
153
154 #define JAVA_24_VERSION 68
155
156 #define JAVA_25_VERSION 69
157
158 #define JAVA_26_VERSION 70
159
160 #define JAVA_27_VERSION 71
161
162 #define CONSTANT_CLASS_DESCRIPTORS 71
163
164 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
165 assert((bad_constant == JVM_CONSTANT_Module ||
166 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
167 "Unexpected bad constant pool entry");
168 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
169 }
170
171 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
172 ConstantPool* cp,
173 const int length,
174 TRAPS) {
175 assert(stream != nullptr, "invariant");
176 assert(cp != nullptr, "invariant");
177
178 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
179 // this function (_current can be allocated in a register, with scalar
180 // replacement of aggregates). The _current pointer is copied back to
181 // stream() when this function returns. DON'T call another method within
182 // this method that uses stream().
183 const ClassFileStream cfs1 = *stream;
184 const ClassFileStream* const cfs = &cfs1;
185
186 DEBUG_ONLY(const u1* const old_current = stream->current();)
187
188 // Used for batching symbol allocations.
189 const char* names[SymbolTable::symbol_alloc_batch_size];
190 int lengths[SymbolTable::symbol_alloc_batch_size];
191 int indices[SymbolTable::symbol_alloc_batch_size];
192 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
193 int names_count = 0;
194
195 // parsing Index 0 is unused
196 for (int index = 1; index < length; index++) {
197 // Each of the following case guarantees one more byte in the stream
198 // for the following tag or the access_flags following constant pool,
199 // so we don't need bounds-check for reading tag.
200 const u1 tag = cfs->get_u1_fast();
201 switch (tag) {
202 case JVM_CONSTANT_Class: {
203 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
204 const u2 name_index = cfs->get_u2_fast();
205 cp->klass_index_at_put(index, name_index);
206 break;
207 }
208 case JVM_CONSTANT_Fieldref: {
209 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
210 const u2 class_index = cfs->get_u2_fast();
211 const u2 name_and_type_index = cfs->get_u2_fast();
212 cp->field_at_put(index, class_index, name_and_type_index);
213 break;
214 }
215 case JVM_CONSTANT_Methodref: {
216 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
217 const u2 class_index = cfs->get_u2_fast();
218 const u2 name_and_type_index = cfs->get_u2_fast();
219 cp->method_at_put(index, class_index, name_and_type_index);
220 break;
221 }
222 case JVM_CONSTANT_InterfaceMethodref: {
223 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
224 const u2 class_index = cfs->get_u2_fast();
225 const u2 name_and_type_index = cfs->get_u2_fast();
226 cp->interface_method_at_put(index, class_index, name_and_type_index);
227 break;
228 }
229 case JVM_CONSTANT_String : {
230 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
231 const u2 string_index = cfs->get_u2_fast();
232 cp->string_index_at_put(index, string_index);
233 break;
234 }
235 case JVM_CONSTANT_MethodHandle :
236 case JVM_CONSTANT_MethodType: {
237 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
238 classfile_parse_error(
239 "Class file version does not support constant tag %u in class file %s",
240 tag, THREAD);
241 return;
242 }
243 if (tag == JVM_CONSTANT_MethodHandle) {
244 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
245 const u1 ref_kind = cfs->get_u1_fast();
246 const u2 method_index = cfs->get_u2_fast();
247 cp->method_handle_index_at_put(index, ref_kind, method_index);
248 }
249 else if (tag == JVM_CONSTANT_MethodType) {
250 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
251 const u2 signature_index = cfs->get_u2_fast();
252 cp->method_type_index_at_put(index, signature_index);
253 }
254 else {
255 ShouldNotReachHere();
256 }
257 break;
258 }
259 case JVM_CONSTANT_Dynamic : {
260 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
261 classfile_parse_error(
262 "Class file version does not support constant tag %u in class file %s",
263 tag, THREAD);
264 return;
265 }
266 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
267 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
268 const u2 name_and_type_index = cfs->get_u2_fast();
269 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
270 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
271 }
272 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
273 break;
274 }
275 case JVM_CONSTANT_InvokeDynamic : {
276 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
277 classfile_parse_error(
278 "Class file version does not support constant tag %u in class file %s",
279 tag, THREAD);
280 return;
281 }
282 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
283 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
284 const u2 name_and_type_index = cfs->get_u2_fast();
285 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
286 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
287 }
288 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
289 break;
290 }
291 case JVM_CONSTANT_Integer: {
292 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
293 const u4 bytes = cfs->get_u4_fast();
294 cp->int_at_put(index, (jint)bytes);
295 break;
296 }
297 case JVM_CONSTANT_Float: {
298 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
299 const u4 bytes = cfs->get_u4_fast();
300 cp->float_at_put(index, *(jfloat*)&bytes);
301 break;
302 }
303 case JVM_CONSTANT_Long: {
304 // A mangled type might cause you to overrun allocated memory
305 guarantee_property(index + 1 < length,
306 "Invalid constant pool entry %u in class file %s",
307 index,
308 CHECK);
309 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
310 const u8 bytes = cfs->get_u8_fast();
311 cp->long_at_put(index, bytes);
312 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
313 break;
314 }
315 case JVM_CONSTANT_Double: {
316 // A mangled type might cause you to overrun allocated memory
317 guarantee_property(index+1 < length,
318 "Invalid constant pool entry %u in class file %s",
319 index,
320 CHECK);
321 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
322 const u8 bytes = cfs->get_u8_fast();
323 cp->double_at_put(index, *(jdouble*)&bytes);
324 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
325 break;
326 }
327 case JVM_CONSTANT_NameAndType: {
328 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
329 const u2 name_index = cfs->get_u2_fast();
330 const u2 signature_index = cfs->get_u2_fast();
331 cp->name_and_type_at_put(index, name_index, signature_index);
332 break;
333 }
334 case JVM_CONSTANT_Utf8 : {
335 cfs->guarantee_more(2, CHECK); // utf8_length
336 u2 utf8_length = cfs->get_u2_fast();
337 const u1* utf8_buffer = cfs->current();
338 assert(utf8_buffer != nullptr, "null utf8 buffer");
339 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
340 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
341 cfs->skip_u1_fast(utf8_length);
342
343 // Before storing the symbol, make sure it's legal
344 if (_need_verify) {
345 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
346 }
347
348 unsigned int hash;
349 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
350 utf8_length,
351 hash);
352 if (result == nullptr) {
353 names[names_count] = (const char*)utf8_buffer;
354 lengths[names_count] = utf8_length;
355 indices[names_count] = index;
356 hashValues[names_count++] = hash;
357 if (names_count == SymbolTable::symbol_alloc_batch_size) {
358 SymbolTable::new_symbols(_loader_data,
359 constantPoolHandle(THREAD, cp),
360 names_count,
361 names,
362 lengths,
363 indices,
364 hashValues);
365 names_count = 0;
366 }
367 } else {
368 cp->symbol_at_put(index, result);
369 }
370 break;
371 }
372 case JVM_CONSTANT_Module:
373 case JVM_CONSTANT_Package: {
374 // Record that an error occurred in these two cases but keep parsing so
375 // that ACC_Module can be checked for in the access_flags. Need to
376 // throw NoClassDefFoundError in that case.
377 if (_major_version >= JAVA_9_VERSION) {
378 cfs->guarantee_more(3, CHECK);
379 cfs->get_u2_fast();
380 set_class_bad_constant_seen(tag);
381 break;
382 }
383 }
384 default: {
385 classfile_parse_error("Unknown constant tag %u in class file %s",
386 tag,
387 THREAD);
388 return;
389 }
390 } // end of switch(tag)
391 } // end of for
392
393 // Allocate the remaining symbols
394 if (names_count > 0) {
395 SymbolTable::new_symbols(_loader_data,
396 constantPoolHandle(THREAD, cp),
397 names_count,
398 names,
399 lengths,
400 indices,
401 hashValues);
402 }
403
404 // Copy _current pointer of local copy back to stream.
405 assert(stream->current() == old_current, "non-exclusive use of stream");
406 stream->set_current(cfs1.current());
407
408 }
409
410 static inline bool valid_cp_range(int index, int length) {
411 return (index > 0 && index < length);
412 }
413
414 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
415 assert(cp != nullptr, "invariant");
416 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
417 return cp->symbol_at(index);
418 }
419 return nullptr;
420 }
421
422 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
423 ConstantPool* const cp,
424 const int length,
425 TRAPS) {
426 assert(cp != nullptr, "invariant");
427 assert(stream != nullptr, "invariant");
428
429 // parsing constant pool entries
430 parse_constant_pool_entries(stream, cp, length, CHECK);
431 if (class_bad_constant_seen() != 0) {
432 // a bad CP entry has been detected previously so stop parsing and just return.
433 return;
434 }
435
436 int index = 1; // declared outside of loops for portability
437 int num_klasses = 0;
438
439 // first verification pass - validate cross references
440 // and fixup class and string constants
441 for (index = 1; index < length; index++) { // Index 0 is unused
442 const jbyte tag = cp->tag_at(index).value();
443 switch (tag) {
444 case JVM_CONSTANT_Class: {
445 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
446 break;
447 }
448 case JVM_CONSTANT_Fieldref:
449 // fall through
450 case JVM_CONSTANT_Methodref:
451 // fall through
452 case JVM_CONSTANT_InterfaceMethodref: {
453 if (!_need_verify) break;
454 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
455 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
456 guarantee_property(valid_klass_reference_at(klass_ref_index),
457 "Invalid constant pool index %u in class file %s",
458 klass_ref_index, CHECK);
459 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
460 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
461 "Invalid constant pool index %u in class file %s",
462 name_and_type_ref_index, CHECK);
463 break;
464 }
465 case JVM_CONSTANT_String: {
466 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
467 break;
468 }
469 case JVM_CONSTANT_Integer:
470 break;
471 case JVM_CONSTANT_Float:
472 break;
473 case JVM_CONSTANT_Long:
474 case JVM_CONSTANT_Double: {
475 index++;
476 guarantee_property(
477 (index < length && cp->tag_at(index).is_invalid()),
478 "Improper constant pool long/double index %u in class file %s",
479 index, CHECK);
480 break;
481 }
482 case JVM_CONSTANT_NameAndType: {
483 if (!_need_verify) break;
484 const int name_ref_index = cp->name_ref_index_at(index);
485 const int signature_ref_index = cp->signature_ref_index_at(index);
486 guarantee_property(valid_symbol_at(name_ref_index),
487 "Invalid constant pool index %u in class file %s",
488 name_ref_index, CHECK);
489 guarantee_property(valid_symbol_at(signature_ref_index),
490 "Invalid constant pool index %u in class file %s",
491 signature_ref_index, CHECK);
492 break;
493 }
494 case JVM_CONSTANT_Utf8:
495 break;
496 case JVM_CONSTANT_UnresolvedClass: // fall-through
497 case JVM_CONSTANT_UnresolvedClassInError: {
498 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
499 break;
500 }
501 case JVM_CONSTANT_ClassIndex: {
502 const int class_index = cp->klass_index_at(index);
503 guarantee_property(valid_symbol_at(class_index),
504 "Invalid constant pool index %u in class file %s",
505 class_index, CHECK);
506
507 Symbol* const name = cp->symbol_at(class_index);
508 const unsigned int name_len = name->utf8_length();
509 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
510 break;
511 }
512 case JVM_CONSTANT_StringIndex: {
513 const int string_index = cp->string_index_at(index);
514 guarantee_property(valid_symbol_at(string_index),
515 "Invalid constant pool index %u in class file %s",
516 string_index, CHECK);
517 Symbol* const sym = cp->symbol_at(string_index);
518 cp->unresolved_string_at_put(index, sym);
519 break;
520 }
521 case JVM_CONSTANT_MethodHandle: {
522 const int ref_index = cp->method_handle_index_at(index);
523 guarantee_property(valid_cp_range(ref_index, length),
524 "Invalid constant pool index %u in class file %s",
525 ref_index, CHECK);
526 const constantTag tag = cp->tag_at(ref_index);
527 const int ref_kind = cp->method_handle_ref_kind_at(index);
528
529 switch (ref_kind) {
530 case JVM_REF_getField:
531 case JVM_REF_getStatic:
532 case JVM_REF_putField:
533 case JVM_REF_putStatic: {
534 guarantee_property(
535 tag.is_field(),
536 "Invalid constant pool index %u in class file %s (not a field)",
537 ref_index, CHECK);
538 break;
539 }
540 case JVM_REF_invokeVirtual:
541 case JVM_REF_newInvokeSpecial: {
542 guarantee_property(
543 tag.is_method(),
544 "Invalid constant pool index %u in class file %s (not a method)",
545 ref_index, CHECK);
546 break;
547 }
548 case JVM_REF_invokeStatic:
549 case JVM_REF_invokeSpecial: {
550 guarantee_property(
551 tag.is_method() ||
552 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
553 "Invalid constant pool index %u in class file %s (not a method)",
554 ref_index, CHECK);
555 break;
556 }
557 case JVM_REF_invokeInterface: {
558 guarantee_property(
559 tag.is_interface_method(),
560 "Invalid constant pool index %u in class file %s (not an interface method)",
561 ref_index, CHECK);
562 break;
563 }
564 default: {
565 classfile_parse_error(
566 "Bad method handle kind at constant pool index %u in class file %s",
567 index, THREAD);
568 return;
569 }
570 } // switch(refkind)
571 // Keep the ref_index unchanged. It will be indirected at link-time.
572 break;
573 } // case MethodHandle
574 case JVM_CONSTANT_MethodType: {
575 const int ref_index = cp->method_type_index_at(index);
576 guarantee_property(valid_symbol_at(ref_index),
577 "Invalid constant pool index %u in class file %s",
578 ref_index, CHECK);
579 break;
580 }
581 case JVM_CONSTANT_Dynamic: {
582 const int name_and_type_ref_index =
583 cp->bootstrap_name_and_type_ref_index_at(index);
584
585 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
586 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
587 "Invalid constant pool index %u in class file %s",
588 name_and_type_ref_index, CHECK);
589 // bootstrap specifier index must be checked later,
590 // when BootstrapMethods attr is available
591
592 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
593 cp->set_has_dynamic_constant();
594 break;
595 }
596 case JVM_CONSTANT_InvokeDynamic: {
597 const int name_and_type_ref_index =
598 cp->bootstrap_name_and_type_ref_index_at(index);
599
600 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
601 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
602 "Invalid constant pool index %u in class file %s",
603 name_and_type_ref_index, CHECK);
604 // bootstrap specifier index must be checked later,
605 // when BootstrapMethods attr is available
606 break;
607 }
608 default: {
609 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
610 ShouldNotReachHere();
611 break;
612 }
613 } // switch(tag)
614 } // end of for
615
616 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
617
618 if (!_need_verify) {
619 return;
620 }
621
622 // second verification pass - checks the strings are of the right format.
623 // but not yet to the other entries
624 for (index = 1; index < length; index++) {
625 const jbyte tag = cp->tag_at(index).value();
626 switch (tag) {
627 case JVM_CONSTANT_UnresolvedClass: {
628 const Symbol* const class_name = cp->klass_name_at(index);
629 // check the name
630 verify_legal_class_name(class_name, CHECK);
631 break;
632 }
633 case JVM_CONSTANT_NameAndType: {
634 if (_need_verify) {
635 const int sig_index = cp->signature_ref_index_at(index);
636 const int name_index = cp->name_ref_index_at(index);
637 const Symbol* const name = cp->symbol_at(name_index);
638 const Symbol* const sig = cp->symbol_at(sig_index);
639 guarantee_property(sig->utf8_length() != 0,
640 "Illegal zero length constant pool entry at %d in class %s",
641 sig_index, CHECK);
642 guarantee_property(name->utf8_length() != 0,
643 "Illegal zero length constant pool entry at %d in class %s",
644 name_index, CHECK);
645
646 if (Signature::is_method(sig)) {
647 // Format check method name and signature
648 verify_legal_method_name(name, CHECK);
649 verify_legal_method_signature(name, sig, CHECK);
650 } else {
651 // Format check field name and signature
652 verify_legal_field_name(name, CHECK);
653 verify_legal_field_signature(name, sig, CHECK);
654 }
655 }
656 break;
657 }
658 case JVM_CONSTANT_Dynamic: {
659 const int name_and_type_ref_index =
660 cp->uncached_name_and_type_ref_index_at(index);
661 // already verified to be utf8
662 const int name_ref_index =
663 cp->name_ref_index_at(name_and_type_ref_index);
664 // already verified to be utf8
665 const int signature_ref_index =
666 cp->signature_ref_index_at(name_and_type_ref_index);
667 const Symbol* const name = cp->symbol_at(name_ref_index);
668 const Symbol* const signature = cp->symbol_at(signature_ref_index);
669 if (_need_verify) {
670 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
671 // Need only to be sure signature is the right type.
672 if (Signature::is_method(signature)) {
673 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
674 }
675 }
676 break;
677 }
678 case JVM_CONSTANT_InvokeDynamic:
679 case JVM_CONSTANT_Fieldref:
680 case JVM_CONSTANT_Methodref:
681 case JVM_CONSTANT_InterfaceMethodref: {
682 const int name_and_type_ref_index =
683 cp->uncached_name_and_type_ref_index_at(index);
684 // already verified to be utf8
685 const int name_ref_index =
686 cp->name_ref_index_at(name_and_type_ref_index);
687 // already verified to be utf8
688 const int signature_ref_index =
689 cp->signature_ref_index_at(name_and_type_ref_index);
690 const Symbol* const name = cp->symbol_at(name_ref_index);
691 const Symbol* const signature = cp->symbol_at(signature_ref_index);
692 if (tag == JVM_CONSTANT_Fieldref) {
693 if (_need_verify) {
694 // Field name and signature are verified above, when iterating NameAndType_info.
695 // Need only to be sure signature is non-zero length and the right type.
696 if (Signature::is_method(signature)) {
697 throwIllegalSignature("Field", name, signature, CHECK);
698 }
699 }
700 } else {
701 if (_need_verify) {
702 // Method name and signature are individually verified above, when iterating
703 // NameAndType_info. Need to check here that signature is non-zero length and
704 // the right type.
705 if (!Signature::is_method(signature)) {
706 throwIllegalSignature("Method", name, signature, CHECK);
707 }
708 }
709 // If a class method name begins with '<', it must be "<init>" and have void signature.
710 const unsigned int name_len = name->utf8_length();
711 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
712 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
713 if (name != vmSymbols::object_initializer_name()) {
714 classfile_parse_error(
715 "Bad method name at constant pool index %u in class file %s",
716 name_ref_index, THREAD);
717 return;
718 } else if (!Signature::is_void_method(signature)) { // must have void signature.
719 throwIllegalSignature("Method", name, signature, CHECK);
720 }
721 }
722 }
723 break;
724 }
725 case JVM_CONSTANT_MethodHandle: {
726 const int ref_index = cp->method_handle_index_at(index);
727 const int ref_kind = cp->method_handle_ref_kind_at(index);
728 switch (ref_kind) {
729 case JVM_REF_invokeVirtual:
730 case JVM_REF_invokeStatic:
731 case JVM_REF_invokeSpecial:
732 case JVM_REF_newInvokeSpecial: {
733 const int name_and_type_ref_index =
734 cp->uncached_name_and_type_ref_index_at(ref_index);
735 const int name_ref_index =
736 cp->name_ref_index_at(name_and_type_ref_index);
737 const Symbol* const name = cp->symbol_at(name_ref_index);
738
739 if (name != vmSymbols::object_initializer_name()) { // !<init>
740 if (ref_kind == JVM_REF_newInvokeSpecial) {
741 classfile_parse_error(
742 "Bad constructor name at constant pool index %u in class file %s",
743 name_ref_index, THREAD);
744 return;
745 }
746 } else { // <init>
747 // The allowed invocation mode of <init> depends on its signature.
748 // This test corresponds to verify_invoke_instructions in the verifier.
749 const int signature_ref_index =
750 cp->signature_ref_index_at(name_and_type_ref_index);
751 const Symbol* const signature = cp->symbol_at(signature_ref_index);
752 if (signature->is_void_method_signature()
753 && ref_kind == JVM_REF_newInvokeSpecial) {
754 // OK, could be a constructor call
755 } else {
756 classfile_parse_error(
757 "Bad method name at constant pool index %u in class file %s",
758 name_ref_index, THREAD);
759 return;
760 }
761 }
762 break;
763 }
764 // Other ref_kinds are already fully checked in previous pass.
765 } // switch(ref_kind)
766 break;
767 }
768 case JVM_CONSTANT_MethodType: {
769 const Symbol* const no_name = vmSymbols::type_name(); // place holder
770 const Symbol* const signature = cp->method_type_signature_at(index);
771 verify_legal_method_signature(no_name, signature, CHECK);
772 break;
773 }
774 case JVM_CONSTANT_Utf8: {
775 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
776 }
777 } // switch(tag)
778 } // end of for
779 }
780
781 class NameSigHash: public ResourceObj {
782 public:
783 const Symbol* _name; // name
784 const Symbol* _sig; // signature
785
786 static const int HASH_ROW_SIZE = 256;
787
788 NameSigHash(Symbol* name, Symbol* sig) :
789 _name(name),
790 _sig(sig) {}
791
792 static unsigned int hash(NameSigHash const& namesig) {
793 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
794 }
795
796 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
797 return (e0._name == e1._name) &&
798 (e0._sig == e1._sig);
799 }
800 };
801
802 using NameSigHashtable = HashTable<NameSigHash, int,
803 NameSigHash::HASH_ROW_SIZE,
804 AnyObj::RESOURCE_AREA, mtInternal,
805 &NameSigHash::hash, &NameSigHash::equals>;
806
807 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
808 assert(super_type != nullptr,"Method doesn't support null super type");
809 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
810 && super_type->name() != vmSymbols::java_lang_Object()) {
811 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
812 err_msg("Value type %s has an identity type as supertype",
813 current->class_name()->as_klass_external_name()));
814 }
815 }
816
817 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
818 int itfs_len,
819 ConstantPool* cp,
820 bool* const has_nonstatic_concrete_methods,
821 // FIXME: lots of these functions
822 // declare their parameters as const,
823 // which adds only noise to the code.
824 // Remove the spurious const modifiers.
825 // Many are of the form "const int x"
826 // or "T* const x".
827 TRAPS) {
828 assert(stream != nullptr, "invariant");
829 assert(cp != nullptr, "invariant");
830 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
831
832 if (itfs_len == 0) {
833 _local_interfaces = Universe::the_empty_instance_klass_array();
834
835 } else {
836 assert(itfs_len > 0, "only called for len>0");
837 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
838 int index = 0;
839 for (index = 0; index < itfs_len; index++) {
840 const u2 interface_index = stream->get_u2(CHECK);
841 guarantee_property(
842 valid_klass_reference_at(interface_index),
843 "Interface name has bad constant pool index %u in class file %s",
844 interface_index, CHECK);
845 _local_interface_indexes->at_put_grow(index, interface_index);
846 }
847
848 if (!_need_verify || itfs_len <= 1) {
849 return;
850 }
851
852 // Check if there's any duplicates in interfaces
853 ResourceMark rm(THREAD);
854 // Set containing interface names
855 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
856 for (index = 0; index < itfs_len; index++) {
857 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
858 // If no duplicates, add (name, nullptr) in hashtable interface_names.
859 if (!interface_names->put(interface_name, 0)) {
860 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
861 interface_name->as_C_string(), THREAD);
862 return;
863 }
864 }
865 }
866 }
867
868 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
869 int constantvalue_index,
870 int signature_index,
871 TRAPS) const {
872 // Make sure the constant pool entry is of a type appropriate to this field
873 guarantee_property(
874 (constantvalue_index > 0 &&
875 constantvalue_index < cp->length()),
876 "Bad initial value index %u in ConstantValue attribute in class file %s",
877 constantvalue_index, CHECK);
878
879 const constantTag value_type = cp->tag_at(constantvalue_index);
880 switch(cp->basic_type_for_signature_at(signature_index)) {
881 case T_LONG: {
882 guarantee_property(value_type.is_long(),
883 "Inconsistent constant value type in class file %s",
884 CHECK);
885 break;
886 }
887 case T_FLOAT: {
888 guarantee_property(value_type.is_float(),
889 "Inconsistent constant value type in class file %s",
890 CHECK);
891 break;
892 }
893 case T_DOUBLE: {
894 guarantee_property(value_type.is_double(),
895 "Inconsistent constant value type in class file %s",
896 CHECK);
897 break;
898 }
899 case T_BYTE:
900 case T_CHAR:
901 case T_SHORT:
902 case T_BOOLEAN:
903 case T_INT: {
904 guarantee_property(value_type.is_int(),
905 "Inconsistent constant value type in class file %s",
906 CHECK);
907 break;
908 }
909 case T_OBJECT: {
910 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
911 && value_type.is_string()),
912 "Bad string initial value in class file %s",
913 CHECK);
914 break;
915 }
916 default: {
917 classfile_parse_error("Unable to set initial value %u in class file %s",
918 constantvalue_index,
919 THREAD);
920 }
921 }
922 }
923
924 class AnnotationCollector : public ResourceObj{
925 public:
926 enum Location { _in_field, _in_method, _in_class };
927 enum ID {
928 _unknown = 0,
929 _method_CallerSensitive,
930 _method_ForceInline,
931 _method_DontInline,
932 _method_ChangesCurrentThread,
933 _method_JvmtiHideEvents,
934 _method_JvmtiMountTransition,
935 _method_InjectedProfile,
936 _method_LambdaForm_Compiled,
937 _method_Hidden,
938 _method_Scoped,
939 _method_IntrinsicCandidate,
940 _jdk_internal_vm_annotation_Contended,
941 _field_Stable,
942 _jdk_internal_vm_annotation_ReservedStackAccess,
943 _jdk_internal_ValueBased,
944 _jdk_internal_LooselyConsistentValue,
945 _jdk_internal_NullRestricted,
946 _java_lang_Deprecated,
947 _java_lang_Deprecated_for_removal,
948 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
949 _method_AOTRuntimeSetup,
950 _annotation_LIMIT
951 };
952 const Location _location;
953 int _annotations_present;
954 u2 _contended_group;
955
956 AnnotationCollector(Location location)
957 : _location(location), _annotations_present(0), _contended_group(0)
958 {
959 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
960 }
961 // If this annotation name has an ID, report it (or _none).
962 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
963 // Set the annotation name:
964 void set_annotation(ID id) {
965 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
966 _annotations_present |= (int)nth_bit((int)id);
967 }
968
969 void remove_annotation(ID id) {
970 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
971 _annotations_present &= (int)~nth_bit((int)id);
972 }
973
974 // Report if the annotation is present.
975 bool has_any_annotations() const { return _annotations_present != 0; }
976 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
977
978 void set_contended_group(u2 group) { _contended_group = group; }
979 u2 contended_group() const { return _contended_group; }
980
981 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
982
983 void set_stable(bool stable) { set_annotation(_field_Stable); }
984 bool is_stable() const { return has_annotation(_field_Stable); }
985
986 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); }
987 };
988
989 // This class also doubles as a holder for metadata cleanup.
990 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
991 private:
992 ClassLoaderData* _loader_data;
993 AnnotationArray* _field_annotations;
994 AnnotationArray* _field_type_annotations;
995 public:
996 FieldAnnotationCollector(ClassLoaderData* loader_data) :
997 AnnotationCollector(_in_field),
998 _loader_data(loader_data),
999 _field_annotations(nullptr),
1000 _field_type_annotations(nullptr) {}
1001 ~FieldAnnotationCollector();
1002 void apply_to(FieldInfo* f);
1003 AnnotationArray* field_annotations() { return _field_annotations; }
1004 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1005
1006 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1007 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1008 };
1009
1010 class MethodAnnotationCollector : public AnnotationCollector{
1011 public:
1012 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1013 void apply_to(const methodHandle& m);
1014 };
1015
1016 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1017 public:
1018 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1019 void apply_to(InstanceKlass* ik);
1020 };
1021
1022
1023 static int skip_annotation_value(const u1*, int, int); // fwd decl
1024
1025 // Safely increment index by val if does not pass limit
1026 #define SAFE_ADD(index, limit, val) \
1027 if (index >= limit - val) return limit; \
1028 index += val;
1029
1030 // Skip an annotation. Return >=limit if there is any problem.
1031 static int skip_annotation(const u1* buffer, int limit, int index) {
1032 assert(buffer != nullptr, "invariant");
1033 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1034 // value := switch (tag:u1) { ... }
1035 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1036 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1037 while (--nmem >= 0 && index < limit) {
1038 SAFE_ADD(index, limit, 2); // skip member
1039 index = skip_annotation_value(buffer, limit, index);
1040 }
1041 return index;
1042 }
1043
1044 // Skip an annotation value. Return >=limit if there is any problem.
1045 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1046 assert(buffer != nullptr, "invariant");
1047
1048 // value := switch (tag:u1) {
1049 // case B, C, I, S, Z, D, F, J, c: con:u2;
1050 // case e: e_class:u2 e_name:u2;
1051 // case s: s_con:u2;
1052 // case [: do(nval:u2) {value};
1053 // case @: annotation;
1054 // case s: s_con:u2;
1055 // }
1056 SAFE_ADD(index, limit, 1); // read tag
1057 const u1 tag = buffer[index - 1];
1058 switch (tag) {
1059 case 'B':
1060 case 'C':
1061 case 'I':
1062 case 'S':
1063 case 'Z':
1064 case 'D':
1065 case 'F':
1066 case 'J':
1067 case 'c':
1068 case 's':
1069 SAFE_ADD(index, limit, 2); // skip con or s_con
1070 break;
1071 case 'e':
1072 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1073 break;
1074 case '[':
1075 {
1076 SAFE_ADD(index, limit, 2); // read nval
1077 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1078 while (--nval >= 0 && index < limit) {
1079 index = skip_annotation_value(buffer, limit, index);
1080 }
1081 }
1082 break;
1083 case '@':
1084 index = skip_annotation(buffer, limit, index);
1085 break;
1086 default:
1087 return limit; // bad tag byte
1088 }
1089 return index;
1090 }
1091
1092 // Sift through annotations, looking for those significant to the VM:
1093 static void parse_annotations(const ConstantPool* const cp,
1094 const u1* buffer, int limit,
1095 AnnotationCollector* coll,
1096 ClassLoaderData* loader_data,
1097 const bool can_access_vm_annotations) {
1098
1099 assert(cp != nullptr, "invariant");
1100 assert(buffer != nullptr, "invariant");
1101 assert(coll != nullptr, "invariant");
1102 assert(loader_data != nullptr, "invariant");
1103
1104 // annotations := do(nann:u2) {annotation}
1105 int index = 2; // read nann
1106 if (index >= limit) return;
1107 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1108 enum { // initial annotation layout
1109 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1110 count_off = 2, // u2 such as 1 (one value)
1111 member_off = 4, // utf8 such as 'value'
1112 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1113 e_tag_val = 'e',
1114 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1115 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1116 e_size = 11, // end of 'e' annotation
1117 c_tag_val = 'c', // payload is type
1118 c_con_off = 7, // utf8 payload, such as 'I'
1119 c_size = 9, // end of 'c' annotation
1120 s_tag_val = 's', // payload is String
1121 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1122 s_size = 9,
1123 b_tag_val = 'Z', // payload is boolean
1124 min_size = 6 // smallest possible size (zero members)
1125 };
1126 // Cannot add min_size to index in case of overflow MAX_INT
1127 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1128 int index0 = index;
1129 index = skip_annotation(buffer, limit, index);
1130 const u1* const abase = buffer + index0;
1131 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1132 const int count = Bytes::get_Java_u2((address)abase + count_off);
1133 const Symbol* const aname = check_symbol_at(cp, atype);
1134 if (aname == nullptr) break; // invalid annotation name
1135 const Symbol* member = nullptr;
1136 if (count >= 1) {
1137 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1138 member = check_symbol_at(cp, member_index);
1139 if (member == nullptr) break; // invalid member name
1140 }
1141
1142 // Here is where parsing particular annotations will take place.
1143 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1144 if (AnnotationCollector::_unknown == id) continue;
1145 coll->set_annotation(id);
1146 if (AnnotationCollector::_java_lang_Deprecated == id) {
1147 // @Deprecated can specify forRemoval=true, which we need
1148 // to record for JFR to use. If the annotation is not well-formed
1149 // then we may not be able to determine that.
1150 const u1* offset = abase + member_off;
1151 // There are only 2 members in @Deprecated.
1152 int n_members = MIN2(count, 2);
1153 for (int i = 0; i < n_members; ++i) {
1154 int member_index = Bytes::get_Java_u2((address)offset);
1155 offset += 2;
1156 member = check_symbol_at(cp, member_index);
1157 if (member == vmSymbols::since() &&
1158 (*((address)offset) == s_tag_val)) {
1159 // Found `since` first so skip over it
1160 offset += 3;
1161 }
1162 else if (member == vmSymbols::for_removal() &&
1163 (*((address)offset) == b_tag_val)) {
1164 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1165 // No guarantee the entry is valid so check it refers to an int in the CP.
1166 if (cp->is_within_bounds(boolean_value_index) &&
1167 cp->tag_at(boolean_value_index).is_int() &&
1168 cp->int_at(boolean_value_index) == 1) {
1169 // forRemoval == true
1170 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1171 }
1172 break; // no need to check further
1173 }
1174 else {
1175 // This @Deprecated annotation is malformed so we don't try to
1176 // determine whether forRemoval is set.
1177 break;
1178 }
1179 }
1180 continue; // proceed to next annotation
1181 }
1182
1183 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1184 // @Contended can optionally specify the contention group.
1185 //
1186 // Contended group defines the equivalence class over the fields:
1187 // the fields within the same contended group are not treated distinct.
1188 // The only exception is default group, which does not incur the
1189 // equivalence. Naturally, contention group for classes is meaningless.
1190 //
1191 // While the contention group is specified as String, annotation
1192 // values are already interned, and we might as well use the constant
1193 // pool index as the group tag.
1194 //
1195 u2 group_index = 0; // default contended group
1196 if (count == 1
1197 && s_size == (index - index0) // match size
1198 && s_tag_val == *(abase + tag_off)
1199 && member == vmSymbols::value_name()) {
1200 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1201 // No guarantee the group_index is valid so check it refers to a
1202 // symbol in the CP.
1203 if (cp->is_within_bounds(group_index) &&
1204 cp->tag_at(group_index).is_utf8()) {
1205 // Seems valid, so check for empty string and reset
1206 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1207 group_index = 0; // default contended group
1208 }
1209 } else {
1210 // Not valid so use the default
1211 group_index = 0;
1212 }
1213 }
1214 coll->set_contended_group(group_index);
1215 continue; // proceed to next annotation
1216 }
1217 }
1218 }
1219
1220
1221 // Parse attributes for a field.
1222 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1223 u2 attributes_count,
1224 bool is_static, u2 signature_index,
1225 u2* const constantvalue_index_addr,
1226 bool* const is_synthetic_addr,
1227 u2* const generic_signature_index_addr,
1228 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1229 TRAPS) {
1230 assert(cfs != nullptr, "invariant");
1231 assert(constantvalue_index_addr != nullptr, "invariant");
1232 assert(is_synthetic_addr != nullptr, "invariant");
1233 assert(generic_signature_index_addr != nullptr, "invariant");
1234 assert(parsed_annotations != nullptr, "invariant");
1235 assert(attributes_count > 0, "attributes_count should be greater than 0");
1236
1237 u2 constantvalue_index = 0;
1238 u2 generic_signature_index = 0;
1239 bool is_synthetic = false;
1240 const u1* runtime_visible_annotations = nullptr;
1241 int runtime_visible_annotations_length = 0;
1242 const u1* runtime_visible_type_annotations = nullptr;
1243 int runtime_visible_type_annotations_length = 0;
1244 bool runtime_invisible_annotations_exists = false;
1245 bool runtime_invisible_type_annotations_exists = false;
1246 const ConstantPool* const cp = _cp;
1247
1248 while (attributes_count--) {
1249 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1250 const u2 attribute_name_index = cfs->get_u2_fast();
1251 const u4 attribute_length = cfs->get_u4_fast();
1252 guarantee_property(valid_symbol_at(attribute_name_index),
1253 "Invalid field attribute index %u in class file %s",
1254 attribute_name_index,
1255 CHECK);
1256
1257 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1258 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1259 // ignore if non-static
1260 if (constantvalue_index != 0) {
1261 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1262 return;
1263 }
1264 guarantee_property(
1265 attribute_length == 2,
1266 "Invalid ConstantValue field attribute length %u in class file %s",
1267 attribute_length, CHECK);
1268
1269 constantvalue_index = cfs->get_u2(CHECK);
1270 if (_need_verify) {
1271 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1272 }
1273 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1274 if (attribute_length != 0) {
1275 classfile_parse_error(
1276 "Invalid Synthetic field attribute length %u in class file %s",
1277 attribute_length, THREAD);
1278 return;
1279 }
1280 is_synthetic = true;
1281 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1282 if (attribute_length != 0) {
1283 classfile_parse_error(
1284 "Invalid Deprecated field attribute length %u in class file %s",
1285 attribute_length, THREAD);
1286 return;
1287 }
1288 } else if (_major_version >= JAVA_1_5_VERSION) {
1289 if (attribute_name == vmSymbols::tag_signature()) {
1290 if (generic_signature_index != 0) {
1291 classfile_parse_error(
1292 "Multiple Signature attributes for field in class file %s", THREAD);
1293 return;
1294 }
1295 if (attribute_length != 2) {
1296 classfile_parse_error(
1297 "Wrong size %u for field's Signature attribute in class file %s",
1298 attribute_length, THREAD);
1299 return;
1300 }
1301 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1302 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1303 if (runtime_visible_annotations != nullptr) {
1304 classfile_parse_error(
1305 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1306 return;
1307 }
1308 runtime_visible_annotations_length = attribute_length;
1309 runtime_visible_annotations = cfs->current();
1310 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1311 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1312 parse_annotations(cp,
1313 runtime_visible_annotations,
1314 runtime_visible_annotations_length,
1315 parsed_annotations,
1316 _loader_data,
1317 _can_access_vm_annotations);
1318 cfs->skip_u1_fast(runtime_visible_annotations_length);
1319 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1320 if (runtime_invisible_annotations_exists) {
1321 classfile_parse_error(
1322 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1323 return;
1324 }
1325 runtime_invisible_annotations_exists = true;
1326 cfs->skip_u1(attribute_length, CHECK);
1327 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1328 if (runtime_visible_type_annotations != nullptr) {
1329 classfile_parse_error(
1330 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1331 return;
1332 }
1333 runtime_visible_type_annotations_length = attribute_length;
1334 runtime_visible_type_annotations = cfs->current();
1335 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1336 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1337 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1338 if (runtime_invisible_type_annotations_exists) {
1339 classfile_parse_error(
1340 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1341 return;
1342 } else {
1343 runtime_invisible_type_annotations_exists = true;
1344 }
1345 cfs->skip_u1(attribute_length, CHECK);
1346 } else {
1347 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1348 }
1349 } else {
1350 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1351 }
1352 }
1353
1354 *constantvalue_index_addr = constantvalue_index;
1355 *is_synthetic_addr = is_synthetic;
1356 *generic_signature_index_addr = generic_signature_index;
1357 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1358 runtime_visible_annotations_length,
1359 CHECK);
1360 parsed_annotations->set_field_annotations(a);
1361 a = allocate_annotations(runtime_visible_type_annotations,
1362 runtime_visible_type_annotations_length,
1363 CHECK);
1364 parsed_annotations->set_field_type_annotations(a);
1365 return;
1366 }
1367
1368
1369 // Side-effects: populates the _fields, _fields_annotations,
1370 // _fields_type_annotations fields
1371 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1372 AccessFlags class_access_flags,
1373 ConstantPool* cp,
1374 const int cp_size,
1375 u2* const java_fields_count_ptr,
1376 TRAPS) {
1377
1378 assert(cfs != nullptr, "invariant");
1379 assert(cp != nullptr, "invariant");
1380 assert(java_fields_count_ptr != nullptr, "invariant");
1381
1382 assert(nullptr == _fields_annotations, "invariant");
1383 assert(nullptr == _fields_type_annotations, "invariant");
1384
1385 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1386 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1387 cfs->guarantee_more(2, CHECK); // length
1388 const u2 length = cfs->get_u2_fast();
1389 *java_fields_count_ptr = length;
1390
1391 int num_injected = 0;
1392 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1393 &num_injected);
1394
1395 // two more slots are required for inline classes:
1396 // one for the static field with a reference to the pre-allocated default value
1397 // one for the field the JVM injects when detecting an empty inline class
1398 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1399 + ((UseAltSubstitutabilityMethod && is_value_class) ? 1 : 0);
1400
1401 // Allocate a temporary resource array to collect field data.
1402 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1403 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1404
1405 int instance_fields_count = 0;
1406 ResourceMark rm(THREAD);
1407 for (int n = 0; n < length; n++) {
1408 // access_flags, name_index, descriptor_index, attributes_count
1409 cfs->guarantee_more(8, CHECK);
1410
1411 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1412 if (!supports_inline_types()) {
1413 recognized_modifiers &= ~JVM_ACC_STRICT;
1414 }
1415
1416 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1417 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1418 AccessFlags access_flags;
1419 access_flags.set_flags(flags);
1420 FieldInfo::FieldFlags fieldFlags(0);
1421
1422 const u2 name_index = cfs->get_u2_fast();
1423 guarantee_property(valid_symbol_at(name_index),
1424 "Invalid constant pool index %u for field name in class file %s",
1425 name_index, CHECK);
1426 const Symbol* const name = cp->symbol_at(name_index);
1427 verify_legal_field_name(name, CHECK);
1428
1429 const u2 signature_index = cfs->get_u2_fast();
1430 guarantee_property(valid_symbol_at(signature_index),
1431 "Invalid constant pool index %u for field signature in class file %s",
1432 signature_index, CHECK);
1433 const Symbol* const sig = cp->symbol_at(signature_index);
1434 verify_legal_field_signature(name, sig, CHECK);
1435 if (!access_flags.is_static()) instance_fields_count++;
1436
1437 u2 constantvalue_index = 0;
1438 bool is_synthetic = false;
1439 u2 generic_signature_index = 0;
1440 const bool is_static = access_flags.is_static();
1441 FieldAnnotationCollector parsed_annotations(_loader_data);
1442
1443 bool is_null_restricted = false;
1444
1445 const u2 attributes_count = cfs->get_u2_fast();
1446 if (attributes_count > 0) {
1447 parse_field_attributes(cfs,
1448 attributes_count,
1449 is_static,
1450 signature_index,
1451 &constantvalue_index,
1452 &is_synthetic,
1453 &generic_signature_index,
1454 &parsed_annotations,
1455 CHECK);
1456
1457 if (parsed_annotations.field_annotations() != nullptr) {
1458 if (_fields_annotations == nullptr) {
1459 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1460 _loader_data, length, nullptr,
1461 CHECK);
1462 }
1463 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1464 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1465 if (!Signature::has_envelope(sig)) {
1466 Exceptions::fthrow(
1467 THREAD_AND_LOCATION,
1468 vmSymbols::java_lang_ClassFormatError(),
1469 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1470 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1471 }
1472 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
1473 if (!is_strict) {
1474 Exceptions::fthrow(
1475 THREAD_AND_LOCATION,
1476 vmSymbols::java_lang_ClassFormatError(),
1477 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s which doesn't have the @jdk.internal.vm.annotation.Strict annotation",
1478 class_name()->as_C_string(), name->as_C_string());
1479 }
1480 is_null_restricted = true;
1481 }
1482 parsed_annotations.set_field_annotations(nullptr);
1483 }
1484 if (parsed_annotations.field_type_annotations() != nullptr) {
1485 if (_fields_type_annotations == nullptr) {
1486 _fields_type_annotations =
1487 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1488 length,
1489 nullptr,
1490 CHECK);
1491 }
1492 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1493 parsed_annotations.set_field_type_annotations(nullptr);
1494 }
1495
1496 if (is_synthetic) {
1497 access_flags.set_is_synthetic();
1498 }
1499 if (generic_signature_index != 0) {
1500 fieldFlags.update_generic(true);
1501 }
1502 }
1503
1504 if (is_null_restricted) {
1505 fieldFlags.update_null_free_inline_type(true);
1506 }
1507
1508 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1509
1510 // Update number of static oop fields.
1511 if (is_static && is_reference_type(type)) {
1512 _static_oop_count++;
1513 }
1514
1515 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1516 fi.set_index(n);
1517 if (fieldFlags.is_generic()) {
1518 fi.set_generic_signature_index(generic_signature_index);
1519 }
1520 parsed_annotations.apply_to(&fi);
1521 if (fi.field_flags().is_contended()) {
1522 _has_contended_fields = true;
1523 }
1524 if (access_flags.is_strict() && access_flags.is_static()) {
1525 _has_strict_static_fields = true;
1526 }
1527 _temp_field_info->append(fi);
1528 }
1529 assert(_temp_field_info->length() == length, "Must be");
1530
1531 if (num_injected != 0) {
1532 for (int n = 0; n < num_injected; n++) {
1533 // Check for duplicates
1534 if (injected[n].may_be_java) {
1535 const Symbol* const name = injected[n].name();
1536 const Symbol* const signature = injected[n].signature();
1537 bool duplicate = false;
1538 for (int i = 0; i < length; i++) {
1539 const FieldInfo* const f = _temp_field_info->adr_at(i);
1540 if (name == cp->symbol_at(f->name_index()) &&
1541 signature == cp->symbol_at(f->signature_index())) {
1542 // Symbol is desclared in Java so skip this one
1543 duplicate = true;
1544 break;
1545 }
1546 }
1547 if (duplicate) {
1548 // These will be removed from the field array at the end
1549 continue;
1550 }
1551 }
1552
1553 // Injected field
1554 FieldInfo::FieldFlags fflags(0);
1555 fflags.update_injected(true);
1556 AccessFlags aflags;
1557 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1558 int idx = _temp_field_info->append(fi);
1559 _temp_field_info->adr_at(idx)->set_index(idx);
1560 }
1561 }
1562
1563 if (is_inline_type) {
1564 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1565 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1566 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1567 // alive.
1568 FieldInfo::FieldFlags fflags2(0);
1569 fflags2.update_injected(true);
1570 AccessFlags aflags2(JVM_ACC_STATIC);
1571 FieldInfo fi2(aflags2,
1572 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1573 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1574 0,
1575 fflags2);
1576 int idx2 = _temp_field_info->append(fi2);
1577 _temp_field_info->adr_at(idx2)->set_index(idx2);
1578 _static_oop_count++;
1579 }
1580 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1581 && _class_name != vmSymbols::java_lang_Object() && UseAltSubstitutabilityMethod) {
1582 // Acmp map required for abstract and concrete value classes
1583 FieldInfo::FieldFlags fflags2(0);
1584 fflags2.update_injected(true);
1585 fflags2.update_stable(true);
1586 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1587 FieldInfo fi3(aflags2,
1588 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1589 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1590 0,
1591 fflags2);
1592 int idx2 = _temp_field_info->append(fi3);
1593 _temp_field_info->adr_at(idx2)->set_index(idx2);
1594 _static_oop_count++;
1595 }
1596
1597 if (_need_verify && length > 1) {
1598 // Check duplicated fields
1599 ResourceMark rm(THREAD);
1600 // Set containing name-signature pairs
1601 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1602 for (int i = 0; i < _temp_field_info->length(); i++) {
1603 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1604 _temp_field_info->adr_at(i)->signature(_cp));
1605 // If no duplicates, add name/signature in hashtable names_and_sigs.
1606 if(!names_and_sigs->put(name_and_sig, 0)) {
1607 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1608 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1609 return;
1610 }
1611 }
1612 }
1613 }
1614
1615
1616 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1617 u4 code_length,
1618 u4 exception_table_length,
1619 TRAPS) {
1620 assert(cfs != nullptr, "invariant");
1621
1622 const unsafe_u2* const exception_table_start = cfs->current();
1623 assert(exception_table_start != nullptr, "null exception table");
1624
1625 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1626 // end_pc,
1627 // handler_pc,
1628 // catch_type_index
1629
1630 // Will check legal target after parsing code array in verifier.
1631 if (_need_verify) {
1632 for (unsigned int i = 0; i < exception_table_length; i++) {
1633 const u2 start_pc = cfs->get_u2_fast();
1634 const u2 end_pc = cfs->get_u2_fast();
1635 const u2 handler_pc = cfs->get_u2_fast();
1636 const u2 catch_type_index = cfs->get_u2_fast();
1637 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1638 "Illegal exception table range in class file %s",
1639 CHECK_NULL);
1640 guarantee_property(handler_pc < code_length,
1641 "Illegal exception table handler in class file %s",
1642 CHECK_NULL);
1643 if (catch_type_index != 0) {
1644 guarantee_property(valid_klass_reference_at(catch_type_index),
1645 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1646 }
1647 }
1648 } else {
1649 cfs->skip_u2_fast(exception_table_length * 4);
1650 }
1651 return exception_table_start;
1652 }
1653
1654 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1655 u4 code_length,
1656 CompressedLineNumberWriteStream**const write_stream,
1657 TRAPS) {
1658
1659 const ClassFileStream* const cfs = _stream;
1660 unsigned int num_entries = cfs->get_u2(CHECK);
1661
1662 // Each entry is a u2 start_pc, and a u2 line_number
1663 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1664
1665 // Verify line number attribute and table length
1666 guarantee_property(
1667 code_attribute_length == sizeof(u2) + length_in_bytes,
1668 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1669
1670 cfs->guarantee_more(length_in_bytes, CHECK);
1671
1672 if ((*write_stream) == nullptr) {
1673 if (length_in_bytes > fixed_buffer_size) {
1674 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1675 } else {
1676 (*write_stream) = new CompressedLineNumberWriteStream(
1677 _linenumbertable_buffer, fixed_buffer_size);
1678 }
1679 }
1680
1681 while (num_entries-- > 0) {
1682 const u2 bci = cfs->get_u2_fast(); // start_pc
1683 const u2 line = cfs->get_u2_fast(); // line_number
1684 guarantee_property(bci < code_length,
1685 "Invalid pc in LineNumberTable in class file %s", CHECK);
1686 (*write_stream)->write_pair(bci, line);
1687 }
1688 }
1689
1690
1691 class LVT_Hash : public AllStatic {
1692 public:
1693
1694 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1695 /*
1696 * 3-tuple start_bci/length/slot has to be unique key,
1697 * so the following comparison seems to be redundant:
1698 * && elem->name_cp_index == entry->_elem->name_cp_index
1699 */
1700 return (e0.start_bci == e1.start_bci &&
1701 e0.length == e1.length &&
1702 e0.name_cp_index == e1.name_cp_index &&
1703 e0.slot == e1.slot);
1704 }
1705
1706 static unsigned int hash(LocalVariableTableElement const& e0) {
1707 unsigned int raw_hash = e0.start_bci;
1708
1709 raw_hash = e0.length + raw_hash * 37;
1710 raw_hash = e0.name_cp_index + raw_hash * 37;
1711 raw_hash = e0.slot + raw_hash * 37;
1712
1713 return raw_hash;
1714 }
1715 };
1716
1717
1718 // Class file LocalVariableTable elements.
1719 class Classfile_LVT_Element {
1720 public:
1721 u2 start_bci;
1722 u2 length;
1723 u2 name_cp_index;
1724 u2 descriptor_cp_index;
1725 u2 slot;
1726 };
1727
1728 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1729 LocalVariableTableElement* const lvt) {
1730 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1731 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1732 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1733 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1734 lvt->signature_cp_index = 0;
1735 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1736 }
1737
1738 // Function is used to parse both attributes:
1739 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1740 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1741 u4 code_length,
1742 u2 max_locals,
1743 u4 code_attribute_length,
1744 u2* const localvariable_table_length,
1745 bool isLVTT,
1746 TRAPS) {
1747 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1748 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1749 const unsigned int size = checked_cast<unsigned>(
1750 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1751
1752 const ConstantPool* const cp = _cp;
1753
1754 // Verify local variable table attribute has right length
1755 if (_need_verify) {
1756 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1757 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1758 }
1759
1760 const unsafe_u2* const localvariable_table_start = cfs->current();
1761 assert(localvariable_table_start != nullptr, "null local variable table");
1762 if (!_need_verify) {
1763 cfs->skip_u2_fast(size);
1764 } else {
1765 cfs->guarantee_more(size * 2, CHECK_NULL);
1766 for(int i = 0; i < (*localvariable_table_length); i++) {
1767 const u2 start_pc = cfs->get_u2_fast();
1768 const u2 length = cfs->get_u2_fast();
1769 const u2 name_index = cfs->get_u2_fast();
1770 const u2 descriptor_index = cfs->get_u2_fast();
1771 const u2 index = cfs->get_u2_fast();
1772 // Assign to a u4 to avoid overflow
1773 const u4 end_pc = (u4)start_pc + (u4)length;
1774
1775 if (start_pc >= code_length) {
1776 classfile_parse_error(
1777 "Invalid start_pc %u in %s in class file %s",
1778 start_pc, tbl_name, THREAD);
1779 return nullptr;
1780 }
1781 if (end_pc > code_length) {
1782 classfile_parse_error(
1783 "Invalid length %u in %s in class file %s",
1784 length, tbl_name, THREAD);
1785 return nullptr;
1786 }
1787 const int cp_size = cp->length();
1788 guarantee_property(valid_symbol_at(name_index),
1789 "Name index %u in %s has bad constant type in class file %s",
1790 name_index, tbl_name, CHECK_NULL);
1791 guarantee_property(valid_symbol_at(descriptor_index),
1792 "Signature index %u in %s has bad constant type in class file %s",
1793 descriptor_index, tbl_name, CHECK_NULL);
1794
1795 const Symbol* const name = cp->symbol_at(name_index);
1796 const Symbol* const sig = cp->symbol_at(descriptor_index);
1797 verify_legal_field_name(name, CHECK_NULL);
1798 u2 extra_slot = 0;
1799 if (!isLVTT) {
1800 verify_legal_field_signature(name, sig, CHECK_NULL);
1801
1802 // 4894874: check special cases for double and long local variables
1803 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1804 sig == vmSymbols::type_signature(T_LONG)) {
1805 extra_slot = 1;
1806 }
1807 }
1808 guarantee_property((index + extra_slot) < max_locals,
1809 "Invalid index %u in %s in class file %s",
1810 index, tbl_name, CHECK_NULL);
1811 }
1812 }
1813 return localvariable_table_start;
1814 }
1815
1816 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1817 u4 code_attribute_length,
1818 TRAPS) {
1819 assert(cfs != nullptr, "invariant");
1820
1821 if (0 == code_attribute_length) {
1822 return nullptr;
1823 }
1824
1825 const u1* const stackmap_table_start = cfs->current();
1826 assert(stackmap_table_start != nullptr, "null stackmap table");
1827
1828 // check code_attribute_length
1829 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1830
1831 return stackmap_table_start;
1832 }
1833
1834 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1835 u2* const checked_exceptions_length,
1836 u4 method_attribute_length,
1837 TRAPS) {
1838 assert(cfs != nullptr, "invariant");
1839 assert(checked_exceptions_length != nullptr, "invariant");
1840
1841 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1842 *checked_exceptions_length = cfs->get_u2_fast();
1843 const unsigned int size =
1844 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1845 const unsafe_u2* const checked_exceptions_start = cfs->current();
1846 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1847 if (!_need_verify) {
1848 cfs->skip_u2_fast(size);
1849 } else {
1850 // Verify each value in the checked exception table
1851 u2 checked_exception;
1852 const u2 len = *checked_exceptions_length;
1853 cfs->guarantee_more(2 * len, CHECK_NULL);
1854 for (int i = 0; i < len; i++) {
1855 checked_exception = cfs->get_u2_fast();
1856 guarantee_property(
1857 valid_klass_reference_at(checked_exception),
1858 "Exception name has bad type at constant pool %u in class file %s",
1859 checked_exception, CHECK_NULL);
1860 }
1861 }
1862 // check exceptions attribute length
1863 if (_need_verify) {
1864 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1865 sizeof(u2) * size),
1866 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1867 }
1868 return checked_exceptions_start;
1869 }
1870
1871 void ClassFileParser::throwIllegalSignature(const char* type,
1872 const Symbol* name,
1873 const Symbol* sig,
1874 TRAPS) const {
1875 assert(name != nullptr, "invariant");
1876 assert(sig != nullptr, "invariant");
1877
1878 ResourceMark rm(THREAD);
1879 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1880 Exceptions::fthrow(THREAD_AND_LOCATION,
1881 vmSymbols::java_lang_ClassFormatError(),
1882 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1883 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1884 }
1885
1886 AnnotationCollector::ID
1887 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1888 const Symbol* name,
1889 const bool can_access_vm_annotations) {
1890 const vmSymbolID sid = vmSymbols::find_sid(name);
1891 // Privileged code can use all annotations. Other code silently drops some.
1892 const bool privileged = loader_data->is_boot_class_loader_data() ||
1893 loader_data->is_platform_class_loader_data() ||
1894 can_access_vm_annotations;
1895 switch (sid) {
1896 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1897 if (_location != _in_method) break; // only allow for methods
1898 if (!privileged) break; // only allow in privileged code
1899 return _method_CallerSensitive;
1900 }
1901 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1902 if (_location != _in_method) break; // only allow for methods
1903 if (!privileged) break; // only allow in privileged code
1904 return _method_ForceInline;
1905 }
1906 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1907 if (_location != _in_method) break; // only allow for methods
1908 if (!privileged) break; // only allow in privileged code
1909 return _method_DontInline;
1910 }
1911 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1912 if (_location != _in_method) break; // only allow for methods
1913 if (!privileged) break; // only allow in privileged code
1914 return _method_ChangesCurrentThread;
1915 }
1916 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1917 if (_location != _in_method) break; // only allow for methods
1918 if (!privileged) break; // only allow in privileged code
1919 return _method_JvmtiHideEvents;
1920 }
1921 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1922 if (_location != _in_method) break; // only allow for methods
1923 if (!privileged) break; // only allow in privileged code
1924 return _method_JvmtiMountTransition;
1925 }
1926 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1927 if (_location != _in_method) break; // only allow for methods
1928 if (!privileged) break; // only allow in privileged code
1929 return _method_InjectedProfile;
1930 }
1931 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1932 if (_location != _in_method) break; // only allow for methods
1933 if (!privileged) break; // only allow in privileged code
1934 return _method_LambdaForm_Compiled;
1935 }
1936 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1937 if (_location != _in_method) break; // only allow for methods
1938 if (!privileged) break; // only allow in privileged code
1939 return _method_Hidden;
1940 }
1941 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1942 if (_location != _in_method) break; // only allow for methods
1943 if (!privileged) break; // only allow in privileged code
1944 return _method_Scoped;
1945 }
1946 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1947 if (_location != _in_method) break; // only allow for methods
1948 if (!privileged) break; // only allow in privileged code
1949 return _method_IntrinsicCandidate;
1950 }
1951 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1952 if (_location != _in_field) break; // only allow for fields
1953 if (!privileged) break; // only allow in privileged code
1954 return _field_Stable;
1955 }
1956 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1957 if (_location != _in_field && _location != _in_class) {
1958 break; // only allow for fields and classes
1959 }
1960 if (!EnableContended || (RestrictContended && !privileged)) {
1961 break; // honor privileges
1962 }
1963 return _jdk_internal_vm_annotation_Contended;
1964 }
1965 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1966 if (_location != _in_method) break; // only allow for methods
1967 if (RestrictReservedStack && !privileged) break; // honor privileges
1968 return _jdk_internal_vm_annotation_ReservedStackAccess;
1969 }
1970 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1971 if (_location != _in_class) break; // only allow for classes
1972 if (!privileged) break; // only allow in privileged code
1973 return _jdk_internal_ValueBased;
1974 }
1975 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1976 if (_location != _in_class) break; // only allow for classes
1977 return _jdk_internal_LooselyConsistentValue;
1978 }
1979 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1980 if (_location != _in_field) break; // only allow for fields
1981 return _jdk_internal_NullRestricted;
1982 }
1983 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1984 return _java_lang_Deprecated;
1985 }
1986 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1987 if (_location != _in_class) break; // only allow for classes
1988 if (!privileged) break; // only allow in privileged code
1989 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1990 }
1991 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1992 if (_location != _in_method) break; // only allow for methods
1993 if (!privileged) break; // only allow in privileged code
1994 return _method_AOTRuntimeSetup;
1995 }
1996 default: {
1997 break;
1998 }
1999 }
2000 return AnnotationCollector::_unknown;
2001 }
2002
2003 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2004 if (is_contended())
2005 // Setting the contended group also sets the contended bit in field flags
2006 f->set_contended_group(contended_group());
2007 if (is_stable())
2008 (f->field_flags_addr())->update_stable(true);
2009 }
2010
2011 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2012 // If there's an error deallocate metadata for field annotations
2013 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2014 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2015 }
2016
2017 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2018 if (has_annotation(_method_CallerSensitive))
2019 m->set_caller_sensitive();
2020 if (has_annotation(_method_ForceInline))
2021 m->set_force_inline();
2022 if (has_annotation(_method_DontInline))
2023 m->set_dont_inline();
2024 if (has_annotation(_method_ChangesCurrentThread))
2025 m->set_changes_current_thread();
2026 if (has_annotation(_method_JvmtiHideEvents))
2027 m->set_jvmti_hide_events();
2028 if (has_annotation(_method_JvmtiMountTransition))
2029 m->set_jvmti_mount_transition();
2030 if (has_annotation(_method_InjectedProfile))
2031 m->set_has_injected_profile();
2032 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2033 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2034 if (has_annotation(_method_Hidden))
2035 m->set_is_hidden();
2036 if (has_annotation(_method_Scoped))
2037 m->set_scoped();
2038 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2039 m->set_intrinsic_candidate();
2040 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2041 m->set_has_reserved_stack_access();
2042 if (has_annotation(_java_lang_Deprecated))
2043 m->set_deprecated();
2044 if (has_annotation(_java_lang_Deprecated_for_removal))
2045 m->set_deprecated_for_removal();
2046 }
2047
2048 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2049 assert(ik != nullptr, "invariant");
2050 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2051 ik->set_is_contended(is_contended());
2052 }
2053 if (has_annotation(_jdk_internal_ValueBased)) {
2054 ik->set_has_value_based_class_annotation();
2055 if (DiagnoseSyncOnValueBasedClasses) {
2056 ik->set_is_value_based();
2057 }
2058 }
2059 if (has_annotation(_java_lang_Deprecated)) {
2060 Array<Method*>* methods = ik->methods();
2061 int length = ik->methods()->length();
2062 for (int i = 0; i < length; i++) {
2063 Method* m = methods->at(i);
2064 m->set_deprecated();
2065 }
2066 }
2067 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2068 Array<Method*>* methods = ik->methods();
2069 int length = ik->methods()->length();
2070 for (int i = 0; i < length; i++) {
2071 Method* m = methods->at(i);
2072 m->set_deprecated_for_removal();
2073 }
2074 }
2075 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) {
2076 ik->set_has_aot_safe_initializer();
2077 }
2078 }
2079
2080 #define MAX_ARGS_SIZE 255
2081 #define MAX_CODE_SIZE 65535
2082 #define INITIAL_MAX_LVT_NUMBER 256
2083
2084 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2085 *
2086 * Rules for LVT's and LVTT's are:
2087 * - There can be any number of LVT's and LVTT's.
2088 * - If there are n LVT's, it is the same as if there was just
2089 * one LVT containing all the entries from the n LVT's.
2090 * - There may be no more than one LVT entry per local variable.
2091 * Two LVT entries are 'equal' if these fields are the same:
2092 * start_pc, length, name, slot
2093 * - There may be no more than one LVTT entry per each LVT entry.
2094 * Each LVTT entry has to match some LVT entry.
2095 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2096 */
2097 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2098 int lvt_cnt,
2099 u2* const localvariable_table_length,
2100 const unsafe_u2** const localvariable_table_start,
2101 int lvtt_cnt,
2102 u2* const localvariable_type_table_length,
2103 const unsafe_u2** const localvariable_type_table_start,
2104 TRAPS) {
2105
2106 ResourceMark rm(THREAD);
2107
2108 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*,
2109 256, AnyObj::RESOURCE_AREA, mtInternal,
2110 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2111
2112 LVT_HashTable* const table = new LVT_HashTable();
2113
2114 // To fill LocalVariableTable in
2115 const Classfile_LVT_Element* cf_lvt;
2116 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2117
2118 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2119 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2120 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2121 copy_lvt_element(&cf_lvt[idx], lvt);
2122 // If no duplicates, add LVT elem in hashtable.
2123 if (table->put(*lvt, lvt) == false
2124 && _need_verify
2125 && _major_version >= JAVA_1_5_VERSION) {
2126 classfile_parse_error("Duplicated LocalVariableTable attribute "
2127 "entry for '%s' in class file %s",
2128 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2129 THREAD);
2130 return;
2131 }
2132 }
2133 }
2134
2135 // To merge LocalVariableTable and LocalVariableTypeTable
2136 const Classfile_LVT_Element* cf_lvtt;
2137 LocalVariableTableElement lvtt_elem;
2138
2139 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2140 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2141 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2142 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2143 LocalVariableTableElement** entry = table->get(lvtt_elem);
2144 if (entry == nullptr) {
2145 if (_need_verify) {
2146 classfile_parse_error("LVTT entry for '%s' in class file %s "
2147 "does not match any LVT entry",
2148 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2149 THREAD);
2150 return;
2151 }
2152 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2153 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2154 "entry for '%s' in class file %s",
2155 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2156 THREAD);
2157 return;
2158 } else {
2159 // to add generic signatures into LocalVariableTable
2160 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2161 }
2162 }
2163 }
2164 }
2165
2166
2167 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2168 const u1* runtime_visible_annotations,
2169 int runtime_visible_annotations_length,
2170 const u1* runtime_visible_parameter_annotations,
2171 int runtime_visible_parameter_annotations_length,
2172 const u1* runtime_visible_type_annotations,
2173 int runtime_visible_type_annotations_length,
2174 const u1* annotation_default,
2175 int annotation_default_length,
2176 TRAPS) {
2177
2178 AnnotationArray* a;
2179
2180 if (runtime_visible_annotations_length > 0) {
2181 a = allocate_annotations(runtime_visible_annotations,
2182 runtime_visible_annotations_length,
2183 CHECK);
2184 cm->set_method_annotations(a);
2185 }
2186
2187 if (runtime_visible_parameter_annotations_length > 0) {
2188 a = allocate_annotations(runtime_visible_parameter_annotations,
2189 runtime_visible_parameter_annotations_length,
2190 CHECK);
2191 cm->set_parameter_annotations(a);
2192 }
2193
2194 if (annotation_default_length > 0) {
2195 a = allocate_annotations(annotation_default,
2196 annotation_default_length,
2197 CHECK);
2198 cm->set_default_annotations(a);
2199 }
2200
2201 if (runtime_visible_type_annotations_length > 0) {
2202 a = allocate_annotations(runtime_visible_type_annotations,
2203 runtime_visible_type_annotations_length,
2204 CHECK);
2205 cm->set_type_annotations(a);
2206 }
2207 }
2208
2209
2210 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2211 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2212 // Method* to save footprint, so we only know the size of the resulting Method* when the
2213 // entire method attribute is parsed.
2214 //
2215 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2216
2217 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2218 bool is_interface,
2219 bool is_value_class,
2220 bool is_abstract_class,
2221 const ConstantPool* cp,
2222 bool* const has_localvariable_table,
2223 TRAPS) {
2224 assert(cfs != nullptr, "invariant");
2225 assert(cp != nullptr, "invariant");
2226 assert(has_localvariable_table != nullptr, "invariant");
2227
2228 ResourceMark rm(THREAD);
2229 // Parse fixed parts:
2230 // access_flags, name_index, descriptor_index, attributes_count
2231 cfs->guarantee_more(8, CHECK_NULL);
2232
2233 u2 flags = cfs->get_u2_fast();
2234 const u2 name_index = cfs->get_u2_fast();
2235 const int cp_size = cp->length();
2236 guarantee_property(
2237 valid_symbol_at(name_index),
2238 "Illegal constant pool index %u for method name in class file %s",
2239 name_index, CHECK_NULL);
2240 const Symbol* const name = cp->symbol_at(name_index);
2241 verify_legal_method_name(name, CHECK_NULL);
2242
2243 const u2 signature_index = cfs->get_u2_fast();
2244 guarantee_property(
2245 valid_symbol_at(signature_index),
2246 "Illegal constant pool index %u for method signature in class file %s",
2247 signature_index, CHECK_NULL);
2248 const Symbol* const signature = cp->symbol_at(signature_index);
2249
2250 if (name == vmSymbols::class_initializer_name()) {
2251 // We ignore the other access flags for a valid class initializer.
2252 // (JVM Spec 2nd ed., chapter 4.6)
2253 if (_major_version < 51) { // backward compatibility
2254 flags = JVM_ACC_STATIC;
2255 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2256 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2257 } else {
2258 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2259 return nullptr;
2260 }
2261 } else {
2262 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2263 }
2264
2265 if (name == vmSymbols::object_initializer_name() && is_interface) {
2266 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2267 return nullptr;
2268 }
2269
2270 if (Arguments::is_valhalla_enabled()) {
2271 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2272 && ((flags & JVM_ACC_STATIC) == 0 )
2273 && !_access_flags.is_identity_class()) {
2274 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2275 return nullptr;
2276 }
2277 }
2278
2279 int args_size = -1; // only used when _need_verify is true
2280 if (_need_verify) {
2281 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2282 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2283 verify_legal_method_signature(name, signature, CHECK_NULL);
2284 if (args_size > MAX_ARGS_SIZE) {
2285 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2286 return nullptr;
2287 }
2288 }
2289
2290 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2291
2292 // Default values for code and exceptions attribute elements
2293 u2 max_stack = 0;
2294 u2 max_locals = 0;
2295 u4 code_length = 0;
2296 const u1* code_start = nullptr;
2297 u2 exception_table_length = 0;
2298 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2299 Array<int>* exception_handlers = Universe::the_empty_int_array();
2300 u2 checked_exceptions_length = 0;
2301 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2302 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2303 int linenumber_table_length = 0;
2304 int total_lvt_length = 0;
2305 u2 lvt_cnt = 0;
2306 u2 lvtt_cnt = 0;
2307 bool lvt_allocated = false;
2308 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2309 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2310 u2* localvariable_table_length = nullptr;
2311 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2312 u2* localvariable_type_table_length = nullptr;
2313 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2314 int method_parameters_length = -1;
2315 const u1* method_parameters_data = nullptr;
2316 bool method_parameters_seen = false;
2317 bool parsed_code_attribute = false;
2318 bool parsed_checked_exceptions_attribute = false;
2319 bool parsed_stackmap_attribute = false;
2320 // stackmap attribute - JDK1.5
2321 const u1* stackmap_data = nullptr;
2322 int stackmap_data_length = 0;
2323 u2 generic_signature_index = 0;
2324 MethodAnnotationCollector parsed_annotations;
2325 const u1* runtime_visible_annotations = nullptr;
2326 int runtime_visible_annotations_length = 0;
2327 const u1* runtime_visible_parameter_annotations = nullptr;
2328 int runtime_visible_parameter_annotations_length = 0;
2329 const u1* runtime_visible_type_annotations = nullptr;
2330 int runtime_visible_type_annotations_length = 0;
2331 bool runtime_invisible_annotations_exists = false;
2332 bool runtime_invisible_type_annotations_exists = false;
2333 bool runtime_invisible_parameter_annotations_exists = false;
2334 const u1* annotation_default = nullptr;
2335 int annotation_default_length = 0;
2336
2337 // Parse code and exceptions attribute
2338 u2 method_attributes_count = cfs->get_u2_fast();
2339 while (method_attributes_count--) {
2340 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2341 const u2 method_attribute_name_index = cfs->get_u2_fast();
2342 const u4 method_attribute_length = cfs->get_u4_fast();
2343 guarantee_property(
2344 valid_symbol_at(method_attribute_name_index),
2345 "Invalid method attribute name index %u in class file %s",
2346 method_attribute_name_index, CHECK_NULL);
2347
2348 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2349 if (method_attribute_name == vmSymbols::tag_code()) {
2350 // Parse Code attribute
2351 if (_need_verify) {
2352 guarantee_property(
2353 !access_flags.is_native() && !access_flags.is_abstract(),
2354 "Code attribute in native or abstract methods in class file %s",
2355 CHECK_NULL);
2356 }
2357 if (parsed_code_attribute) {
2358 classfile_parse_error("Multiple Code attributes in class file %s",
2359 THREAD);
2360 return nullptr;
2361 }
2362 parsed_code_attribute = true;
2363
2364 // Stack size, locals size, and code size
2365 cfs->guarantee_more(8, CHECK_NULL);
2366 max_stack = cfs->get_u2_fast();
2367 max_locals = cfs->get_u2_fast();
2368 code_length = cfs->get_u4_fast();
2369 if (_need_verify) {
2370 guarantee_property(args_size <= max_locals,
2371 "Arguments can't fit into locals in class file %s",
2372 CHECK_NULL);
2373 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2374 "Invalid method Code length %u in class file %s",
2375 code_length, CHECK_NULL);
2376 }
2377 // Code pointer
2378 code_start = cfs->current();
2379 assert(code_start != nullptr, "null code start");
2380 cfs->guarantee_more(code_length, CHECK_NULL);
2381 cfs->skip_u1_fast(code_length);
2382
2383 // Exception handler table
2384 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2385 exception_table_length = cfs->get_u2_fast();
2386 if (exception_table_length > 0) {
2387 exception_table_start = parse_exception_table(cfs,
2388 code_length,
2389 exception_table_length,
2390 CHECK_NULL);
2391 }
2392
2393 // Parse additional attributes in code attribute
2394 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2395 u2 code_attributes_count = cfs->get_u2_fast();
2396
2397 unsigned int calculated_attribute_length = 0;
2398
2399 calculated_attribute_length =
2400 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2401 calculated_attribute_length += checked_cast<unsigned int>(
2402 code_length +
2403 sizeof(exception_table_length) +
2404 sizeof(code_attributes_count) +
2405 exception_table_length *
2406 ( sizeof(u2) + // start_pc
2407 sizeof(u2) + // end_pc
2408 sizeof(u2) + // handler_pc
2409 sizeof(u2) )); // catch_type_index
2410
2411 while (code_attributes_count--) {
2412 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2413 const u2 code_attribute_name_index = cfs->get_u2_fast();
2414 const u4 code_attribute_length = cfs->get_u4_fast();
2415 calculated_attribute_length += code_attribute_length +
2416 (unsigned)sizeof(code_attribute_name_index) +
2417 (unsigned)sizeof(code_attribute_length);
2418 guarantee_property(valid_symbol_at(code_attribute_name_index),
2419 "Invalid code attribute name index %u in class file %s",
2420 code_attribute_name_index,
2421 CHECK_NULL);
2422 if (LoadLineNumberTables &&
2423 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2424 // Parse and compress line number table
2425 parse_linenumber_table(code_attribute_length,
2426 code_length,
2427 &linenumber_table,
2428 CHECK_NULL);
2429
2430 } else if (LoadLocalVariableTables &&
2431 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2432 // Parse local variable table
2433 if (!lvt_allocated) {
2434 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2435 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2436 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2437 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2438 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2439 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2440 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2441 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2442 lvt_allocated = true;
2443 }
2444 if (lvt_cnt == max_lvt_cnt) {
2445 max_lvt_cnt <<= 1;
2446 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2447 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2448 }
2449 localvariable_table_start[lvt_cnt] =
2450 parse_localvariable_table(cfs,
2451 code_length,
2452 max_locals,
2453 code_attribute_length,
2454 &localvariable_table_length[lvt_cnt],
2455 false, // is not LVTT
2456 CHECK_NULL);
2457 total_lvt_length += localvariable_table_length[lvt_cnt];
2458 lvt_cnt++;
2459 } else if (LoadLocalVariableTypeTables &&
2460 _major_version >= JAVA_1_5_VERSION &&
2461 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2462 if (!lvt_allocated) {
2463 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2464 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2465 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2466 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2467 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2468 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2469 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2470 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2471 lvt_allocated = true;
2472 }
2473 // Parse local variable type table
2474 if (lvtt_cnt == max_lvtt_cnt) {
2475 max_lvtt_cnt <<= 1;
2476 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2477 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2478 }
2479 localvariable_type_table_start[lvtt_cnt] =
2480 parse_localvariable_table(cfs,
2481 code_length,
2482 max_locals,
2483 code_attribute_length,
2484 &localvariable_type_table_length[lvtt_cnt],
2485 true, // is LVTT
2486 CHECK_NULL);
2487 lvtt_cnt++;
2488 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2489 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2490 // Stack map is only needed by the new verifier in JDK1.5.
2491 if (parsed_stackmap_attribute) {
2492 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2493 return nullptr;
2494 }
2495 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2496 stackmap_data_length = code_attribute_length;
2497 parsed_stackmap_attribute = true;
2498 } else {
2499 // Skip unknown attributes
2500 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2501 }
2502 }
2503 // check method attribute length
2504 if (_need_verify) {
2505 guarantee_property(method_attribute_length == calculated_attribute_length,
2506 "Code segment has wrong length in class file %s",
2507 CHECK_NULL);
2508 }
2509 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2510 // Parse Exceptions attribute
2511 if (parsed_checked_exceptions_attribute) {
2512 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2513 THREAD);
2514 return nullptr;
2515 }
2516 parsed_checked_exceptions_attribute = true;
2517 checked_exceptions_start =
2518 parse_checked_exceptions(cfs,
2519 &checked_exceptions_length,
2520 method_attribute_length,
2521 CHECK_NULL);
2522 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2523 // reject multiple method parameters
2524 if (method_parameters_seen) {
2525 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2526 THREAD);
2527 return nullptr;
2528 }
2529 method_parameters_seen = true;
2530 method_parameters_length = cfs->get_u1_fast();
2531 const u4 real_length = (method_parameters_length * 4u) + 1u;
2532 if (method_attribute_length != real_length) {
2533 classfile_parse_error(
2534 "Invalid MethodParameters method attribute length %u in class file",
2535 method_attribute_length, THREAD);
2536 return nullptr;
2537 }
2538 method_parameters_data = cfs->current();
2539 cfs->skip_u2_fast(method_parameters_length);
2540 cfs->skip_u2_fast(method_parameters_length);
2541 // ignore this attribute if it cannot be reflected
2542 if (!vmClasses::reflect_Parameter_klass_is_loaded())
2543 method_parameters_length = -1;
2544 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2545 if (method_attribute_length != 0) {
2546 classfile_parse_error(
2547 "Invalid Synthetic method attribute length %u in class file %s",
2548 method_attribute_length, THREAD);
2549 return nullptr;
2550 }
2551 // Should we check that there hasn't already been a synthetic attribute?
2552 access_flags.set_is_synthetic();
2553 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2554 if (method_attribute_length != 0) {
2555 classfile_parse_error(
2556 "Invalid Deprecated method attribute length %u in class file %s",
2557 method_attribute_length, THREAD);
2558 return nullptr;
2559 }
2560 } else if (_major_version >= JAVA_1_5_VERSION) {
2561 if (method_attribute_name == vmSymbols::tag_signature()) {
2562 if (generic_signature_index != 0) {
2563 classfile_parse_error(
2564 "Multiple Signature attributes for method in class file %s",
2565 THREAD);
2566 return nullptr;
2567 }
2568 if (method_attribute_length != 2) {
2569 classfile_parse_error(
2570 "Invalid Signature attribute length %u in class file %s",
2571 method_attribute_length, THREAD);
2572 return nullptr;
2573 }
2574 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2575 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2576 if (runtime_visible_annotations != nullptr) {
2577 classfile_parse_error(
2578 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2579 THREAD);
2580 return nullptr;
2581 }
2582 runtime_visible_annotations_length = method_attribute_length;
2583 runtime_visible_annotations = cfs->current();
2584 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2585 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2586 parse_annotations(cp,
2587 runtime_visible_annotations,
2588 runtime_visible_annotations_length,
2589 &parsed_annotations,
2590 _loader_data,
2591 _can_access_vm_annotations);
2592 cfs->skip_u1_fast(runtime_visible_annotations_length);
2593 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2594 if (runtime_invisible_annotations_exists) {
2595 classfile_parse_error(
2596 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2597 THREAD);
2598 return nullptr;
2599 }
2600 runtime_invisible_annotations_exists = true;
2601 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2602 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2603 if (runtime_visible_parameter_annotations != nullptr) {
2604 classfile_parse_error(
2605 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2606 THREAD);
2607 return nullptr;
2608 }
2609 runtime_visible_parameter_annotations_length = method_attribute_length;
2610 runtime_visible_parameter_annotations = cfs->current();
2611 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2612 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2613 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2614 if (runtime_invisible_parameter_annotations_exists) {
2615 classfile_parse_error(
2616 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2617 THREAD);
2618 return nullptr;
2619 }
2620 runtime_invisible_parameter_annotations_exists = true;
2621 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2622 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2623 if (annotation_default != nullptr) {
2624 classfile_parse_error(
2625 "Multiple AnnotationDefault attributes for method in class file %s",
2626 THREAD);
2627 return nullptr;
2628 }
2629 annotation_default_length = method_attribute_length;
2630 annotation_default = cfs->current();
2631 assert(annotation_default != nullptr, "null annotation default");
2632 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2633 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2634 if (runtime_visible_type_annotations != nullptr) {
2635 classfile_parse_error(
2636 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2637 THREAD);
2638 return nullptr;
2639 }
2640 runtime_visible_type_annotations_length = method_attribute_length;
2641 runtime_visible_type_annotations = cfs->current();
2642 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2643 // No need for the VM to parse Type annotations
2644 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2645 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2646 if (runtime_invisible_type_annotations_exists) {
2647 classfile_parse_error(
2648 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2649 THREAD);
2650 return nullptr;
2651 }
2652 runtime_invisible_type_annotations_exists = true;
2653 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2654 } else {
2655 // Skip unknown attributes
2656 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2657 }
2658 } else {
2659 // Skip unknown attributes
2660 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2661 }
2662 }
2663
2664 if (linenumber_table != nullptr) {
2665 linenumber_table->write_terminator();
2666 linenumber_table_length = linenumber_table->position();
2667 }
2668
2669 // Make sure there's at least one Code attribute in non-native/non-abstract method
2670 if (_need_verify) {
2671 guarantee_property(access_flags.is_native() ||
2672 access_flags.is_abstract() ||
2673 parsed_code_attribute,
2674 "Absent Code attribute in method that is not native or abstract in class file %s",
2675 CHECK_NULL);
2676 }
2677
2678 // All sizing information for a Method* is finally available, now create it
2679 InlineTableSizes sizes(
2680 total_lvt_length,
2681 linenumber_table_length,
2682 exception_table_length,
2683 checked_exceptions_length,
2684 method_parameters_length,
2685 generic_signature_index,
2686 runtime_visible_annotations_length,
2687 runtime_visible_parameter_annotations_length,
2688 runtime_visible_type_annotations_length,
2689 annotation_default_length,
2690 0);
2691
2692 Method* const m = Method::allocate(_loader_data,
2693 code_length,
2694 access_flags,
2695 &sizes,
2696 ConstMethod::NORMAL,
2697 _cp->symbol_at(name_index),
2698 CHECK_NULL);
2699
2700 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2701
2702 // Fill in information from fixed part (access_flags already set)
2703 m->set_constants(_cp);
2704 m->set_name_index(name_index);
2705 m->set_signature_index(signature_index);
2706 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2707 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2708
2709 // Fill in code attribute information
2710 m->set_max_stack(max_stack);
2711 m->set_max_locals(max_locals);
2712 if (stackmap_data != nullptr) {
2713 m->constMethod()->copy_stackmap_data(_loader_data,
2714 (u1*)stackmap_data,
2715 stackmap_data_length,
2716 CHECK_NULL);
2717 }
2718
2719 // Copy byte codes
2720 m->set_code((u1*)code_start);
2721
2722 // Copy line number table
2723 if (linenumber_table != nullptr) {
2724 memcpy(m->compressed_linenumber_table(),
2725 linenumber_table->buffer(),
2726 linenumber_table_length);
2727 }
2728
2729 // Copy exception table
2730 if (exception_table_length > 0) {
2731 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2732 m->exception_table_start(),
2733 exception_table_length * sizeof(ExceptionTableElement),
2734 sizeof(u2));
2735 }
2736
2737 // Copy method parameters
2738 if (method_parameters_length > 0) {
2739 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2740 for (int i = 0; i < method_parameters_length; i++) {
2741 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2742 method_parameters_data += 2;
2743 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2744 method_parameters_data += 2;
2745 }
2746 }
2747
2748 // Copy checked exceptions
2749 if (checked_exceptions_length > 0) {
2750 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2751 m->checked_exceptions_start(),
2752 checked_exceptions_length * sizeof(CheckedExceptionElement),
2753 sizeof(u2));
2754 }
2755
2756 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2757 if (total_lvt_length > 0) {
2758 *has_localvariable_table = true;
2759 copy_localvariable_table(m->constMethod(),
2760 lvt_cnt,
2761 localvariable_table_length,
2762 localvariable_table_start,
2763 lvtt_cnt,
2764 localvariable_type_table_length,
2765 localvariable_type_table_start,
2766 CHECK_NULL);
2767 }
2768
2769 if (parsed_annotations.has_any_annotations())
2770 parsed_annotations.apply_to(methodHandle(THREAD, m));
2771
2772 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2773 m->set_is_hidden();
2774 }
2775 if (parsed_annotations.has_aot_runtime_setup()) {
2776 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() ||
2777 !access_flags.is_private() || !access_flags.is_static()) {
2778 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL);
2779 }
2780 _has_aot_runtime_setup_method = true;
2781 }
2782
2783 // Copy annotations
2784 copy_method_annotations(m->constMethod(),
2785 runtime_visible_annotations,
2786 runtime_visible_annotations_length,
2787 runtime_visible_parameter_annotations,
2788 runtime_visible_parameter_annotations_length,
2789 runtime_visible_type_annotations,
2790 runtime_visible_type_annotations_length,
2791 annotation_default,
2792 annotation_default_length,
2793 CHECK_NULL);
2794
2795 if (InstanceKlass::is_finalization_enabled() &&
2796 name == vmSymbols::finalize_method_name() &&
2797 signature == vmSymbols::void_method_signature()) {
2798 if (m->is_empty_method()) {
2799 _has_empty_finalizer = true;
2800 } else {
2801 _has_finalizer = true;
2802 }
2803 }
2804
2805 NOT_PRODUCT(m->verify());
2806 return m;
2807 }
2808
2809
2810 // Side-effects: populates the _methods field in the parser
2811 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2812 bool is_interface,
2813 bool is_value_class,
2814 bool is_abstract_type,
2815 bool* const has_localvariable_table,
2816 bool* has_final_method,
2817 bool* declares_nonstatic_concrete_methods,
2818 TRAPS) {
2819 assert(cfs != nullptr, "invariant");
2820 assert(has_localvariable_table != nullptr, "invariant");
2821 assert(has_final_method != nullptr, "invariant");
2822 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2823
2824 assert(nullptr == _methods, "invariant");
2825
2826 cfs->guarantee_more(2, CHECK); // length
2827 const u2 length = cfs->get_u2_fast();
2828 if (length == 0) {
2829 _methods = Universe::the_empty_method_array();
2830 } else {
2831 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2832 length,
2833 nullptr,
2834 CHECK);
2835
2836 for (int index = 0; index < length; index++) {
2837 Method* method = parse_method(cfs,
2838 is_interface,
2839 is_value_class,
2840 is_abstract_type,
2841 _cp,
2842 has_localvariable_table,
2843 CHECK);
2844
2845 if (method->is_final()) {
2846 *has_final_method = true;
2847 }
2848 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2849 // used for interface initialization, and default method inheritance analysis
2850 if (is_interface && !(*declares_nonstatic_concrete_methods)
2851 && !method->is_abstract() && !method->is_static()) {
2852 *declares_nonstatic_concrete_methods = true;
2853 }
2854 _methods->at_put(index, method);
2855 }
2856
2857 if (_need_verify && length > 1) {
2858 // Check duplicated methods
2859 ResourceMark rm(THREAD);
2860 // Set containing name-signature pairs
2861 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2862 for (int i = 0; i < length; i++) {
2863 const Method* const m = _methods->at(i);
2864 NameSigHash name_and_sig(m->name(), m->signature());
2865 // If no duplicates, add name/signature in hashtable names_and_sigs.
2866 if(!names_and_sigs->put(name_and_sig, 0)) {
2867 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2868 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2869 return;
2870 }
2871 }
2872 }
2873 }
2874 }
2875
2876 static const intArray* sort_methods(Array<Method*>* methods) {
2877 const int length = methods->length();
2878 // If JVMTI original method ordering or sharing is enabled we have to
2879 // remember the original class file ordering.
2880 // We temporarily use the vtable_index field in the Method* to store the
2881 // class file index, so we can read in after calling qsort.
2882 // Put the method ordering in the shared archive.
2883 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2884 for (int index = 0; index < length; index++) {
2885 Method* const m = methods->at(index);
2886 assert(!m->valid_vtable_index(), "vtable index should not be set");
2887 m->set_vtable_index(index);
2888 }
2889 }
2890 // Sort method array by ascending method name (for faster lookups & vtable construction)
2891 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2892 Method::sort_methods(methods);
2893
2894 intArray* method_ordering = nullptr;
2895 // If JVMTI original method ordering or sharing is enabled construct int
2896 // array remembering the original ordering
2897 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2898 method_ordering = new intArray(length, length, -1);
2899 for (int index = 0; index < length; index++) {
2900 Method* const m = methods->at(index);
2901 const int old_index = m->vtable_index();
2902 assert(old_index >= 0 && old_index < length, "invalid method index");
2903 method_ordering->at_put(index, old_index);
2904 m->set_vtable_index(Method::invalid_vtable_index);
2905 }
2906 }
2907 return method_ordering;
2908 }
2909
2910 // Parse generic_signature attribute for methods and fields
2911 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2912 TRAPS) {
2913 assert(cfs != nullptr, "invariant");
2914
2915 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2916 const u2 generic_signature_index = cfs->get_u2_fast();
2917 guarantee_property(
2918 valid_symbol_at(generic_signature_index),
2919 "Invalid Signature attribute at constant pool index %u in class file %s",
2920 generic_signature_index, CHECK_0);
2921 return generic_signature_index;
2922 }
2923
2924 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2925 TRAPS) {
2926
2927 assert(cfs != nullptr, "invariant");
2928
2929 cfs->guarantee_more(2, CHECK); // sourcefile_index
2930 const u2 sourcefile_index = cfs->get_u2_fast();
2931 guarantee_property(
2932 valid_symbol_at(sourcefile_index),
2933 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2934 sourcefile_index, CHECK);
2935 set_class_sourcefile_index(sourcefile_index);
2936 }
2937
2938 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2939 int length,
2940 TRAPS) {
2941 assert(cfs != nullptr, "invariant");
2942
2943 const u1* const sde_buffer = cfs->current();
2944 assert(sde_buffer != nullptr, "null sde buffer");
2945
2946 // Don't bother storing it if there is no way to retrieve it
2947 if (JvmtiExport::can_get_source_debug_extension()) {
2948 assert((length+1) > length, "Overflow checking");
2949 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2950 for (int i = 0; i < length; i++) {
2951 sde[i] = sde_buffer[i];
2952 }
2953 sde[length] = '\0';
2954 set_class_sde_buffer((const char*)sde, length);
2955 }
2956 // Got utf8 string, set stream position forward
2957 cfs->skip_u1(length, CHECK);
2958 }
2959
2960
2961 // Inner classes can be static, private or protected (classic VM does this)
2962 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2963 JVM_ACC_PRIVATE | \
2964 JVM_ACC_PROTECTED | \
2965 JVM_ACC_STATIC \
2966 )
2967
2968 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2969 // Return -1 if none is found.
2970 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2971 Symbol* cp_klass_name = cp->klass_name_at(inner);
2972 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2973 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2974 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2975 return idx;
2976 }
2977 }
2978 return -1;
2979 }
2980
2981 // Return the outer_class_info_index for the InnerClasses entry containing the
2982 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2983 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2984 if (inner == 0) return -1;
2985 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2986 if (idx == -1) return -1;
2987 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2988 return result;
2989 }
2990
2991 // Return true if circularity is found, false if no circularity is found.
2992 // Use Floyd's cycle finding algorithm.
2993 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2994 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2995 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2996
2997 while (fast != -1 && fast != 0) {
2998 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2999 return true; // found a circularity
3000 }
3001 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3002 if (fast == -1) return false;
3003 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3004 if (fast == -1) return false;
3005 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3006 assert(slow != -1, "sanity check");
3007 }
3008 return false;
3009 }
3010
3011 // Loop through each InnerClasses entry checking for circularities and duplications
3012 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3013 // return true if a circularity or entries with duplicate inner_class_info_indexes
3014 // are found.
3015 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3016 // Loop through each InnerClasses entry.
3017 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3018 // Return true if there are circular entries.
3019 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3020 return true;
3021 }
3022 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3023 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3024 y += InstanceKlass::inner_class_next_offset) {
3025
3026 // 4347400: make sure there's no duplicate entry in the classes array
3027 if (_major_version >= JAVA_1_5_VERSION) {
3028 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3029 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3030 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3031 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3032 "Duplicate entry in InnerClasses attribute in class file %s",
3033 CHECK_(true));
3034 }
3035 // Return true if there are two entries with the same inner_class_info_index.
3036 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3037 return true;
3038 }
3039 }
3040 }
3041 return false;
3042 }
3043
3044 // Return number of classes in the inner classes attribute table
3045 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3046 const ConstantPool* cp,
3047 const u1* const inner_classes_attribute_start,
3048 bool parsed_enclosingmethod_attribute,
3049 u2 enclosing_method_class_index,
3050 u2 enclosing_method_method_index,
3051 TRAPS) {
3052 const u1* const current_mark = cfs->current();
3053 u2 length = 0;
3054 if (inner_classes_attribute_start != nullptr) {
3055 cfs->set_current(inner_classes_attribute_start);
3056 cfs->guarantee_more(2, CHECK_0); // length
3057 length = cfs->get_u2_fast();
3058 }
3059
3060 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3061 // method data:
3062 // [inner_class_info_index,
3063 // outer_class_info_index,
3064 // inner_name_index,
3065 // inner_class_access_flags,
3066 // ...
3067 // enclosing_method_class_index,
3068 // enclosing_method_method_index]
3069 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3070 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3071 _inner_classes = inner_classes;
3072
3073 int index = 0;
3074 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3075 for (int n = 0; n < length; n++) {
3076 // Inner class index
3077 const u2 inner_class_info_index = cfs->get_u2_fast();
3078 guarantee_property(
3079 valid_klass_reference_at(inner_class_info_index),
3080 "inner_class_info_index %u has bad constant type in class file %s",
3081 inner_class_info_index, CHECK_0);
3082 // Outer class index
3083 const u2 outer_class_info_index = cfs->get_u2_fast();
3084 guarantee_property(
3085 outer_class_info_index == 0 ||
3086 valid_klass_reference_at(outer_class_info_index),
3087 "outer_class_info_index %u has bad constant type in class file %s",
3088 outer_class_info_index, CHECK_0);
3089
3090 if (outer_class_info_index != 0) {
3091 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3092 char* bytes = (char*)outer_class_name->bytes();
3093 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3094 "Outer class is an array class in class file %s", CHECK_0);
3095 }
3096 // Inner class name
3097 const u2 inner_name_index = cfs->get_u2_fast();
3098 guarantee_property(
3099 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3100 "inner_name_index %u has bad constant type in class file %s",
3101 inner_name_index, CHECK_0);
3102 if (_need_verify) {
3103 guarantee_property(inner_class_info_index != outer_class_info_index,
3104 "Class is both outer and inner class in class file %s", CHECK_0);
3105 }
3106
3107 // Access flags
3108 u2 flags;
3109 // JVM_ACC_MODULE is defined in JDK-9 and later.
3110 if (_major_version >= JAVA_9_VERSION) {
3111 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3112 } else {
3113 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3114 }
3115
3116 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3117 // Set abstract bit for old class files for backward compatibility
3118 flags |= JVM_ACC_ABSTRACT;
3119 }
3120
3121 if (!supports_inline_types()) {
3122 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3123 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3124 if (!is_module && !is_interface) {
3125 flags |= JVM_ACC_IDENTITY;
3126 }
3127 }
3128
3129 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3130 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3131 AccessFlags inner_access_flags(flags);
3132
3133 inner_classes->at_put(index++, inner_class_info_index);
3134 inner_classes->at_put(index++, outer_class_info_index);
3135 inner_classes->at_put(index++, inner_name_index);
3136 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3137 }
3138
3139 // Check for circular and duplicate entries.
3140 bool has_circularity = false;
3141 if (_need_verify) {
3142 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3143 if (has_circularity) {
3144 // If circularity check failed then ignore InnerClasses attribute.
3145 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3146 index = 0;
3147 if (parsed_enclosingmethod_attribute) {
3148 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3149 _inner_classes = inner_classes;
3150 } else {
3151 _inner_classes = Universe::the_empty_short_array();
3152 }
3153 }
3154 }
3155 // Set EnclosingMethod class and method indexes.
3156 if (parsed_enclosingmethod_attribute) {
3157 inner_classes->at_put(index++, enclosing_method_class_index);
3158 inner_classes->at_put(index++, enclosing_method_method_index);
3159 }
3160 assert(index == size || has_circularity, "wrong size");
3161
3162 // Restore buffer's current position.
3163 cfs->set_current(current_mark);
3164
3165 return length;
3166 }
3167
3168 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3169 const u1* const nest_members_attribute_start,
3170 TRAPS) {
3171 const u1* const current_mark = cfs->current();
3172 u2 length = 0;
3173 if (nest_members_attribute_start != nullptr) {
3174 cfs->set_current(nest_members_attribute_start);
3175 cfs->guarantee_more(2, CHECK_0); // length
3176 length = cfs->get_u2_fast();
3177 }
3178 const int size = length;
3179 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3180 _nest_members = nest_members;
3181
3182 int index = 0;
3183 cfs->guarantee_more(2 * length, CHECK_0);
3184 for (int n = 0; n < length; n++) {
3185 const u2 class_info_index = cfs->get_u2_fast();
3186 guarantee_property(
3187 valid_klass_reference_at(class_info_index),
3188 "Nest member class_info_index %u has bad constant type in class file %s",
3189 class_info_index, CHECK_0);
3190 nest_members->at_put(index++, class_info_index);
3191 }
3192 assert(index == size, "wrong size");
3193
3194 // Restore buffer's current position.
3195 cfs->set_current(current_mark);
3196
3197 return length;
3198 }
3199
3200 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3201 const u1* const permitted_subclasses_attribute_start,
3202 TRAPS) {
3203 const u1* const current_mark = cfs->current();
3204 u2 length = 0;
3205 if (permitted_subclasses_attribute_start != nullptr) {
3206 cfs->set_current(permitted_subclasses_attribute_start);
3207 cfs->guarantee_more(2, CHECK_0); // length
3208 length = cfs->get_u2_fast();
3209 }
3210 const int size = length;
3211 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3212 _permitted_subclasses = permitted_subclasses;
3213
3214 if (length > 0) {
3215 int index = 0;
3216 cfs->guarantee_more(2 * length, CHECK_0);
3217 for (int n = 0; n < length; n++) {
3218 const u2 class_info_index = cfs->get_u2_fast();
3219 guarantee_property(
3220 valid_klass_reference_at(class_info_index),
3221 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3222 class_info_index, CHECK_0);
3223 permitted_subclasses->at_put(index++, class_info_index);
3224 }
3225 assert(index == size, "wrong size");
3226 }
3227
3228 // Restore buffer's current position.
3229 cfs->set_current(current_mark);
3230
3231 return length;
3232 }
3233
3234 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3235 const u1* const loadable_descriptors_attribute_start,
3236 TRAPS) {
3237 const u1* const current_mark = cfs->current();
3238 u2 length = 0;
3239 if (loadable_descriptors_attribute_start != nullptr) {
3240 cfs->set_current(loadable_descriptors_attribute_start);
3241 cfs->guarantee_more(2, CHECK_0); // length
3242 length = cfs->get_u2_fast();
3243 }
3244 const int size = length;
3245 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3246 _loadable_descriptors = loadable_descriptors;
3247 if (length > 0) {
3248 int index = 0;
3249 cfs->guarantee_more(2 * length, CHECK_0);
3250 for (int n = 0; n < length; n++) {
3251 const u2 descriptor_index = cfs->get_u2_fast();
3252 guarantee_property(
3253 valid_symbol_at(descriptor_index),
3254 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3255 descriptor_index, CHECK_0);
3256 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3257 bool valid = legal_field_signature(descriptor, CHECK_0);
3258 if(!valid) {
3259 ResourceMark rm(THREAD);
3260 Exceptions::fthrow(THREAD_AND_LOCATION,
3261 vmSymbols::java_lang_ClassFormatError(),
3262 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3263 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3264 return 0;
3265 }
3266 loadable_descriptors->at_put(index++, descriptor_index);
3267 }
3268 assert(index == size, "wrong size");
3269 }
3270
3271 // Restore buffer's current position.
3272 cfs->set_current(current_mark);
3273
3274 return length;
3275 }
3276
3277 // Record {
3278 // u2 attribute_name_index;
3279 // u4 attribute_length;
3280 // u2 components_count;
3281 // component_info components[components_count];
3282 // }
3283 // component_info {
3284 // u2 name_index;
3285 // u2 descriptor_index
3286 // u2 attributes_count;
3287 // attribute_info_attributes[attributes_count];
3288 // }
3289 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3290 const ConstantPool* cp,
3291 const u1* const record_attribute_start,
3292 TRAPS) {
3293 const u1* const current_mark = cfs->current();
3294 int components_count = 0;
3295 unsigned int calculate_attr_size = 0;
3296 if (record_attribute_start != nullptr) {
3297 cfs->set_current(record_attribute_start);
3298 cfs->guarantee_more(2, CHECK_0); // num of components
3299 components_count = (int)cfs->get_u2_fast();
3300 calculate_attr_size = 2;
3301 }
3302
3303 Array<RecordComponent*>* const record_components =
3304 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3305 _record_components = record_components;
3306
3307 for (int x = 0; x < components_count; x++) {
3308 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3309
3310 const u2 name_index = cfs->get_u2_fast();
3311 guarantee_property(valid_symbol_at(name_index),
3312 "Invalid constant pool index %u for name in Record attribute in class file %s",
3313 name_index, CHECK_0);
3314 const Symbol* const name = cp->symbol_at(name_index);
3315 verify_legal_field_name(name, CHECK_0);
3316
3317 const u2 descriptor_index = cfs->get_u2_fast();
3318 guarantee_property(valid_symbol_at(descriptor_index),
3319 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3320 descriptor_index, CHECK_0);
3321 const Symbol* const descr = cp->symbol_at(descriptor_index);
3322 verify_legal_field_signature(name, descr, CHECK_0);
3323
3324 const u2 attributes_count = cfs->get_u2_fast();
3325 calculate_attr_size += 6;
3326 u2 generic_sig_index = 0;
3327 const u1* runtime_visible_annotations = nullptr;
3328 int runtime_visible_annotations_length = 0;
3329 bool runtime_invisible_annotations_exists = false;
3330 const u1* runtime_visible_type_annotations = nullptr;
3331 int runtime_visible_type_annotations_length = 0;
3332 bool runtime_invisible_type_annotations_exists = false;
3333
3334 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3335 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3336 for (int y = 0; y < attributes_count; y++) {
3337 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3338 const u2 attribute_name_index = cfs->get_u2_fast();
3339 const u4 attribute_length = cfs->get_u4_fast();
3340 calculate_attr_size += 6;
3341 guarantee_property(
3342 valid_symbol_at(attribute_name_index),
3343 "Invalid Record attribute name index %u in class file %s",
3344 attribute_name_index, CHECK_0);
3345
3346 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3347 if (attribute_name == vmSymbols::tag_signature()) {
3348 if (generic_sig_index != 0) {
3349 classfile_parse_error(
3350 "Multiple Signature attributes for Record component in class file %s",
3351 THREAD);
3352 return 0;
3353 }
3354 if (attribute_length != 2) {
3355 classfile_parse_error(
3356 "Invalid Signature attribute length %u in Record component in class file %s",
3357 attribute_length, THREAD);
3358 return 0;
3359 }
3360 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3361
3362 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3363 if (runtime_visible_annotations != nullptr) {
3364 classfile_parse_error(
3365 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3366 return 0;
3367 }
3368 runtime_visible_annotations_length = attribute_length;
3369 runtime_visible_annotations = cfs->current();
3370
3371 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3372 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3373 cfs->skip_u1_fast(runtime_visible_annotations_length);
3374
3375 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3376 if (runtime_invisible_annotations_exists) {
3377 classfile_parse_error(
3378 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3379 return 0;
3380 }
3381 runtime_invisible_annotations_exists = true;
3382 cfs->skip_u1(attribute_length, CHECK_0);
3383
3384 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3385 if (runtime_visible_type_annotations != nullptr) {
3386 classfile_parse_error(
3387 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3388 return 0;
3389 }
3390 runtime_visible_type_annotations_length = attribute_length;
3391 runtime_visible_type_annotations = cfs->current();
3392
3393 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3394 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3395 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3396
3397 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3398 if (runtime_invisible_type_annotations_exists) {
3399 classfile_parse_error(
3400 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3401 return 0;
3402 }
3403 runtime_invisible_type_annotations_exists = true;
3404 cfs->skip_u1(attribute_length, CHECK_0);
3405
3406 } else {
3407 // Skip unknown attributes
3408 cfs->skip_u1(attribute_length, CHECK_0);
3409 }
3410 calculate_attr_size += attribute_length;
3411 } // End of attributes For loop
3412
3413 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3414 runtime_visible_annotations_length,
3415 CHECK_0);
3416 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3417 runtime_visible_type_annotations_length,
3418 CHECK_0);
3419
3420 RecordComponent* record_component =
3421 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3422 annotations, type_annotations, CHECK_0);
3423 record_components->at_put(x, record_component);
3424 } // End of component processing loop
3425
3426 // Restore buffer's current position.
3427 cfs->set_current(current_mark);
3428 return calculate_attr_size;
3429 }
3430
3431 void ClassFileParser::parse_classfile_synthetic_attribute() {
3432 set_class_synthetic_flag(true);
3433 }
3434
3435 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3436 assert(cfs != nullptr, "invariant");
3437
3438 const u2 signature_index = cfs->get_u2(CHECK);
3439 guarantee_property(
3440 valid_symbol_at(signature_index),
3441 "Invalid constant pool index %u in Signature attribute in class file %s",
3442 signature_index, CHECK);
3443 set_class_generic_signature_index(signature_index);
3444 }
3445
3446 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3447 ConstantPool* cp,
3448 u4 attribute_byte_length,
3449 TRAPS) {
3450 assert(cfs != nullptr, "invariant");
3451 assert(cp != nullptr, "invariant");
3452 const int cp_size = cp->length();
3453
3454 const u1* const current_before_parsing = cfs->current();
3455
3456 guarantee_property(attribute_byte_length >= sizeof(u2),
3457 "Invalid BootstrapMethods attribute length %u in class file %s",
3458 attribute_byte_length,
3459 CHECK);
3460
3461 cfs->guarantee_more(attribute_byte_length, CHECK);
3462
3463 const int num_bootstrap_methods = cfs->get_u2_fast();
3464
3465 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods,
3466 "Short length on BootstrapMethods in class file %s",
3467 CHECK);
3468
3469 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3470
3471 // Eagerly assign the arrays so that they will be deallocated with the constant
3472 // pool if there is an error.
3473 BSMAttributeEntries::InsertionIterator iter =
3474 cp->bsm_entries().start_extension(num_bootstrap_methods,
3475 bootstrap_methods_u2_len,
3476 _loader_data,
3477 CHECK);
3478
3479 for (int i = 0; i < num_bootstrap_methods; i++) {
3480 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3481 u2 bootstrap_method_ref = cfs->get_u2_fast();
3482 u2 num_bootstrap_arguments = cfs->get_u2_fast();
3483 guarantee_property(
3484 valid_cp_range(bootstrap_method_ref, cp_size) &&
3485 cp->tag_at(bootstrap_method_ref).is_method_handle(),
3486 "bootstrap_method_index %u has bad constant type in class file %s",
3487 bootstrap_method_ref,
3488 CHECK);
3489 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc]
3490
3491 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments);
3492 guarantee_property(entry != nullptr,
3493 "Invalid BootstrapMethods num_bootstrap_methods."
3494 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK);
3495
3496 for (int argi = 0; argi < num_bootstrap_arguments; argi++) {
3497 const u2 argument_index = cfs->get_u2_fast();
3498 guarantee_property(
3499 valid_cp_range(argument_index, cp_size) &&
3500 cp->tag_at(argument_index).is_loadable_constant(),
3501 "argument_index %u has bad constant type in class file %s",
3502 argument_index,
3503 CHECK);
3504 entry->set_argument(argi, argument_index);
3505 }
3506 }
3507 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3508 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3509 "Bad length on BootstrapMethods in class file %s",
3510 CHECK);
3511 }
3512
3513 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3514 ConstantPool* cp,
3515 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3516 TRAPS) {
3517 assert(cfs != nullptr, "invariant");
3518 assert(cp != nullptr, "invariant");
3519 assert(parsed_annotations != nullptr, "invariant");
3520
3521 // Set inner classes attribute to default sentinel
3522 _inner_classes = Universe::the_empty_short_array();
3523 // Set nest members attribute to default sentinel
3524 _nest_members = Universe::the_empty_short_array();
3525 // Set _permitted_subclasses attribute to default sentinel
3526 _permitted_subclasses = Universe::the_empty_short_array();
3527 // Set _loadable_descriptors attribute to default sentinel
3528 _loadable_descriptors = Universe::the_empty_short_array();
3529 cfs->guarantee_more(2, CHECK); // attributes_count
3530 u2 attributes_count = cfs->get_u2_fast();
3531 bool parsed_sourcefile_attribute = false;
3532 bool parsed_innerclasses_attribute = false;
3533 bool parsed_nest_members_attribute = false;
3534 bool parsed_permitted_subclasses_attribute = false;
3535 bool parsed_loadable_descriptors_attribute = false;
3536 bool parsed_nest_host_attribute = false;
3537 bool parsed_record_attribute = false;
3538 bool parsed_enclosingmethod_attribute = false;
3539 bool parsed_bootstrap_methods_attribute = false;
3540 const u1* runtime_visible_annotations = nullptr;
3541 int runtime_visible_annotations_length = 0;
3542 const u1* runtime_visible_type_annotations = nullptr;
3543 int runtime_visible_type_annotations_length = 0;
3544 bool runtime_invisible_type_annotations_exists = false;
3545 bool runtime_invisible_annotations_exists = false;
3546 bool parsed_source_debug_ext_annotations_exist = false;
3547 const u1* inner_classes_attribute_start = nullptr;
3548 u4 inner_classes_attribute_length = 0;
3549 u2 enclosing_method_class_index = 0;
3550 u2 enclosing_method_method_index = 0;
3551 const u1* nest_members_attribute_start = nullptr;
3552 u4 nest_members_attribute_length = 0;
3553 const u1* record_attribute_start = nullptr;
3554 u4 record_attribute_length = 0;
3555 const u1* permitted_subclasses_attribute_start = nullptr;
3556 u4 permitted_subclasses_attribute_length = 0;
3557 const u1* loadable_descriptors_attribute_start = nullptr;
3558 u4 loadable_descriptors_attribute_length = 0;
3559
3560 // Iterate over attributes
3561 while (attributes_count--) {
3562 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3563 const u2 attribute_name_index = cfs->get_u2_fast();
3564 const u4 attribute_length = cfs->get_u4_fast();
3565 guarantee_property(
3566 valid_symbol_at(attribute_name_index),
3567 "Attribute name has bad constant pool index %u in class file %s",
3568 attribute_name_index, CHECK);
3569 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3570 if (tag == vmSymbols::tag_source_file()) {
3571 // Check for SourceFile tag
3572 if (_need_verify) {
3573 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3574 }
3575 if (parsed_sourcefile_attribute) {
3576 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3577 return;
3578 } else {
3579 parsed_sourcefile_attribute = true;
3580 }
3581 parse_classfile_sourcefile_attribute(cfs, CHECK);
3582 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3583 // Check for SourceDebugExtension tag
3584 if (parsed_source_debug_ext_annotations_exist) {
3585 classfile_parse_error(
3586 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3587 return;
3588 }
3589 parsed_source_debug_ext_annotations_exist = true;
3590 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3591 } else if (tag == vmSymbols::tag_inner_classes()) {
3592 // Check for InnerClasses tag
3593 if (parsed_innerclasses_attribute) {
3594 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3595 return;
3596 } else {
3597 parsed_innerclasses_attribute = true;
3598 }
3599 inner_classes_attribute_start = cfs->current();
3600 inner_classes_attribute_length = attribute_length;
3601 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3602 } else if (tag == vmSymbols::tag_synthetic()) {
3603 // Check for Synthetic tag
3604 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3605 if (attribute_length != 0) {
3606 classfile_parse_error(
3607 "Invalid Synthetic classfile attribute length %u in class file %s",
3608 attribute_length, THREAD);
3609 return;
3610 }
3611 parse_classfile_synthetic_attribute();
3612 } else if (tag == vmSymbols::tag_deprecated()) {
3613 // Check for Deprecated tag - 4276120
3614 if (attribute_length != 0) {
3615 classfile_parse_error(
3616 "Invalid Deprecated classfile attribute length %u in class file %s",
3617 attribute_length, THREAD);
3618 return;
3619 }
3620 } else if (_major_version >= JAVA_1_5_VERSION) {
3621 if (tag == vmSymbols::tag_signature()) {
3622 if (_generic_signature_index != 0) {
3623 classfile_parse_error(
3624 "Multiple Signature attributes in class file %s", THREAD);
3625 return;
3626 }
3627 if (attribute_length != 2) {
3628 classfile_parse_error(
3629 "Wrong Signature attribute length %u in class file %s",
3630 attribute_length, THREAD);
3631 return;
3632 }
3633 parse_classfile_signature_attribute(cfs, CHECK);
3634 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3635 if (runtime_visible_annotations != nullptr) {
3636 classfile_parse_error(
3637 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3638 return;
3639 }
3640 runtime_visible_annotations_length = attribute_length;
3641 runtime_visible_annotations = cfs->current();
3642 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3643 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3644 parse_annotations(cp,
3645 runtime_visible_annotations,
3646 runtime_visible_annotations_length,
3647 parsed_annotations,
3648 _loader_data,
3649 _can_access_vm_annotations);
3650 cfs->skip_u1_fast(runtime_visible_annotations_length);
3651 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3652 if (runtime_invisible_annotations_exists) {
3653 classfile_parse_error(
3654 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3655 return;
3656 }
3657 runtime_invisible_annotations_exists = true;
3658 cfs->skip_u1(attribute_length, CHECK);
3659 } else if (tag == vmSymbols::tag_enclosing_method()) {
3660 if (parsed_enclosingmethod_attribute) {
3661 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3662 return;
3663 } else {
3664 parsed_enclosingmethod_attribute = true;
3665 }
3666 guarantee_property(attribute_length == 4,
3667 "Wrong EnclosingMethod attribute length %u in class file %s",
3668 attribute_length, CHECK);
3669 cfs->guarantee_more(4, CHECK); // class_index, method_index
3670 enclosing_method_class_index = cfs->get_u2_fast();
3671 enclosing_method_method_index = cfs->get_u2_fast();
3672 if (enclosing_method_class_index == 0) {
3673 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3674 return;
3675 }
3676 // Validate the constant pool indices and types
3677 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3678 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3679 if (enclosing_method_method_index != 0 &&
3680 (!cp->is_within_bounds(enclosing_method_method_index) ||
3681 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3682 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3683 return;
3684 }
3685 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3686 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3687 if (parsed_bootstrap_methods_attribute) {
3688 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3689 return;
3690 }
3691 parsed_bootstrap_methods_attribute = true;
3692 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3693 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3694 if (runtime_visible_type_annotations != nullptr) {
3695 classfile_parse_error(
3696 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3697 return;
3698 }
3699 runtime_visible_type_annotations_length = attribute_length;
3700 runtime_visible_type_annotations = cfs->current();
3701 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3702 // No need for the VM to parse Type annotations
3703 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3704 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3705 if (runtime_invisible_type_annotations_exists) {
3706 classfile_parse_error(
3707 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3708 return;
3709 }
3710 runtime_invisible_type_annotations_exists = true;
3711 cfs->skip_u1(attribute_length, CHECK);
3712 } else if (_major_version >= JAVA_11_VERSION) {
3713 if (tag == vmSymbols::tag_nest_members()) {
3714 // Check for NestMembers tag
3715 if (parsed_nest_members_attribute) {
3716 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3717 return;
3718 } else {
3719 parsed_nest_members_attribute = true;
3720 }
3721 if (parsed_nest_host_attribute) {
3722 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3723 return;
3724 }
3725 nest_members_attribute_start = cfs->current();
3726 nest_members_attribute_length = attribute_length;
3727 cfs->skip_u1(nest_members_attribute_length, CHECK);
3728 } else if (tag == vmSymbols::tag_nest_host()) {
3729 if (parsed_nest_host_attribute) {
3730 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3731 return;
3732 } else {
3733 parsed_nest_host_attribute = true;
3734 }
3735 if (parsed_nest_members_attribute) {
3736 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3737 return;
3738 }
3739 if (_need_verify) {
3740 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3741 }
3742 cfs->guarantee_more(2, CHECK);
3743 u2 class_info_index = cfs->get_u2_fast();
3744 guarantee_property(
3745 valid_klass_reference_at(class_info_index),
3746 "Nest-host class_info_index %u has bad constant type in class file %s",
3747 class_info_index, CHECK);
3748 _nest_host = class_info_index;
3749
3750 } else if (_major_version >= JAVA_16_VERSION) {
3751 if (tag == vmSymbols::tag_record()) {
3752 if (parsed_record_attribute) {
3753 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3754 return;
3755 }
3756 parsed_record_attribute = true;
3757 record_attribute_start = cfs->current();
3758 record_attribute_length = attribute_length;
3759 } else if (_major_version >= JAVA_17_VERSION) {
3760 if (tag == vmSymbols::tag_permitted_subclasses()) {
3761 if (parsed_permitted_subclasses_attribute) {
3762 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3763 return;
3764 }
3765 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3766 if (_access_flags.is_final()) {
3767 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3768 return;
3769 }
3770 parsed_permitted_subclasses_attribute = true;
3771 permitted_subclasses_attribute_start = cfs->current();
3772 permitted_subclasses_attribute_length = attribute_length;
3773 }
3774 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3775 if (parsed_loadable_descriptors_attribute) {
3776 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3777 return;
3778 }
3779 parsed_loadable_descriptors_attribute = true;
3780 loadable_descriptors_attribute_start = cfs->current();
3781 loadable_descriptors_attribute_length = attribute_length;
3782 }
3783 }
3784 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3785 cfs->skip_u1(attribute_length, CHECK);
3786 } else {
3787 // Unknown attribute
3788 cfs->skip_u1(attribute_length, CHECK);
3789 }
3790 } else {
3791 // Unknown attribute
3792 cfs->skip_u1(attribute_length, CHECK);
3793 }
3794 } else {
3795 // Unknown attribute
3796 cfs->skip_u1(attribute_length, CHECK);
3797 }
3798 }
3799 _class_annotations = allocate_annotations(runtime_visible_annotations,
3800 runtime_visible_annotations_length,
3801 CHECK);
3802 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3803 runtime_visible_type_annotations_length,
3804 CHECK);
3805
3806 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3807 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3808 cfs,
3809 cp,
3810 inner_classes_attribute_start,
3811 parsed_innerclasses_attribute,
3812 enclosing_method_class_index,
3813 enclosing_method_method_index,
3814 CHECK);
3815 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3816 guarantee_property(
3817 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3818 "Wrong InnerClasses attribute length in class file %s", CHECK);
3819 }
3820 }
3821
3822 if (parsed_nest_members_attribute) {
3823 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3824 cfs,
3825 nest_members_attribute_start,
3826 CHECK);
3827 if (_need_verify) {
3828 guarantee_property(
3829 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3830 "Wrong NestMembers attribute length in class file %s", CHECK);
3831 }
3832 }
3833
3834 if (parsed_record_attribute) {
3835 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3836 cfs,
3837 cp,
3838 record_attribute_start,
3839 CHECK);
3840 if (_need_verify) {
3841 guarantee_property(record_attribute_length == calculated_attr_length,
3842 "Record attribute has wrong length in class file %s",
3843 CHECK);
3844 }
3845 }
3846
3847 if (parsed_permitted_subclasses_attribute) {
3848 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3849 cfs,
3850 permitted_subclasses_attribute_start,
3851 CHECK);
3852 if (_need_verify) {
3853 guarantee_property(
3854 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3855 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3856 }
3857 }
3858
3859 if (parsed_loadable_descriptors_attribute) {
3860 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3861 cfs,
3862 loadable_descriptors_attribute_start,
3863 CHECK);
3864 if (_need_verify) {
3865 guarantee_property(
3866 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3867 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3868 }
3869 }
3870
3871 if (_max_bootstrap_specifier_index >= 0) {
3872 guarantee_property(parsed_bootstrap_methods_attribute,
3873 "Missing BootstrapMethods attribute in class file %s", CHECK);
3874 }
3875 }
3876
3877 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3878 assert(k != nullptr, "invariant");
3879
3880 if (_synthetic_flag)
3881 k->set_is_synthetic();
3882 if (_sourcefile_index != 0) {
3883 k->set_source_file_name_index(_sourcefile_index);
3884 }
3885 if (_generic_signature_index != 0) {
3886 k->set_generic_signature_index(_generic_signature_index);
3887 }
3888 if (_sde_buffer != nullptr) {
3889 k->set_source_debug_extension(_sde_buffer, _sde_length);
3890 }
3891 }
3892
3893 // Create the Annotations object that will
3894 // hold the annotations array for the Klass.
3895 void ClassFileParser::create_combined_annotations(TRAPS) {
3896 if (_class_annotations == nullptr &&
3897 _class_type_annotations == nullptr &&
3898 _fields_annotations == nullptr &&
3899 _fields_type_annotations == nullptr) {
3900 // Don't create the Annotations object unnecessarily.
3901 return;
3902 }
3903
3904 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3905 annotations->set_class_annotations(_class_annotations);
3906 annotations->set_class_type_annotations(_class_type_annotations);
3907 annotations->set_fields_annotations(_fields_annotations);
3908 annotations->set_fields_type_annotations(_fields_type_annotations);
3909
3910 // This is the Annotations object that will be
3911 // assigned to InstanceKlass being constructed.
3912 _combined_annotations = annotations;
3913
3914 // The annotations arrays below has been transferred the
3915 // _combined_annotations so these fields can now be cleared.
3916 _class_annotations = nullptr;
3917 _class_type_annotations = nullptr;
3918 _fields_annotations = nullptr;
3919 _fields_type_annotations = nullptr;
3920 }
3921
3922 // Transfer ownership of metadata allocated to the InstanceKlass.
3923 void ClassFileParser::apply_parsed_class_metadata(
3924 InstanceKlass* this_klass,
3925 int java_fields_count) {
3926 assert(this_klass != nullptr, "invariant");
3927
3928 _cp->set_pool_holder(this_klass);
3929 this_klass->set_constants(_cp);
3930 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3931 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3932 this_klass->set_fields_status(_fields_status);
3933 this_klass->set_methods(_methods);
3934 this_klass->set_inner_classes(_inner_classes);
3935 this_klass->set_nest_members(_nest_members);
3936 this_klass->set_nest_host_index(_nest_host);
3937 this_klass->set_loadable_descriptors(_loadable_descriptors);
3938 this_klass->set_annotations(_combined_annotations);
3939 this_klass->set_permitted_subclasses(_permitted_subclasses);
3940 this_klass->set_record_components(_record_components);
3941 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3942
3943 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3944
3945 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3946 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3947 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3948 // its _super. If an OOM occurs while loading the current klass, its _super field
3949 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3950 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3951 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3952
3953 // Clear out these fields so they don't get deallocated by the destructor
3954 clear_class_metadata();
3955 }
3956
3957 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3958 int anno_length,
3959 TRAPS) {
3960 AnnotationArray* annotations = nullptr;
3961 if (anno != nullptr) {
3962 annotations = MetadataFactory::new_array<u1>(_loader_data,
3963 anno_length,
3964 CHECK_(annotations));
3965 for (int i = 0; i < anno_length; i++) {
3966 annotations->at_put(i, anno[i]);
3967 }
3968 }
3969 return annotations;
3970 }
3971
3972 void ClassFileParser::check_super_class(ConstantPool* const cp,
3973 const int super_class_index,
3974 const bool need_verify,
3975 TRAPS) {
3976 assert(cp != nullptr, "invariant");
3977
3978 if (super_class_index == 0) {
3979 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3980 "Invalid superclass index 0 in class file %s",
3981 CHECK);
3982 } else {
3983 guarantee_property(valid_klass_reference_at(super_class_index),
3984 "Invalid superclass index %u in class file %s",
3985 super_class_index,
3986 CHECK);
3987
3988 // The class name should be legal because it is checked when parsing constant pool.
3989 // However, make sure it is not an array type.
3990 if (need_verify) {
3991 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3992 "Bad superclass name in class file %s", CHECK);
3993 }
3994 }
3995 }
3996
3997 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3998 _max_nonstatic_oop_maps = max_blocks;
3999 _nonstatic_oop_map_count = 0;
4000 if (max_blocks == 0) {
4001 _nonstatic_oop_maps = nullptr;
4002 } else {
4003 _nonstatic_oop_maps =
4004 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4005 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4006 }
4007 }
4008
4009 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4010 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4011 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4012 }
4013
4014 // addition of super oop maps
4015 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4016 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4017 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4018
4019 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4020 _nonstatic_oop_map_count += nof_blocks;
4021 }
4022
4023 // collection of oops
4024 void OopMapBlocksBuilder::add(int offset, int count) {
4025 if (_nonstatic_oop_map_count == 0) {
4026 _nonstatic_oop_map_count++;
4027 }
4028 OopMapBlock* nonstatic_oop_map = last_oop_map();
4029 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4030 nonstatic_oop_map->set_offset(offset);
4031 nonstatic_oop_map->set_count(count);
4032 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4033 nonstatic_oop_map->increment_count(count);
4034 } else { // Need a new one...
4035 _nonstatic_oop_map_count++;
4036 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4037 nonstatic_oop_map = last_oop_map();
4038 nonstatic_oop_map->set_offset(offset);
4039 nonstatic_oop_map->set_count(count);
4040 }
4041 }
4042
4043 // general purpose copy, e.g. into allocated instanceKlass
4044 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4045 if (_nonstatic_oop_map_count != 0) {
4046 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4047 }
4048 }
4049
4050 // Sort and compact adjacent blocks
4051 void OopMapBlocksBuilder::compact() {
4052 if (_nonstatic_oop_map_count <= 1) {
4053 return;
4054 }
4055 /*
4056 * Since field layout sneaks in oops before values, we will be able to condense
4057 * blocks. There is potential to compact between super, own refs and values
4058 * containing refs.
4059 *
4060 * Currently compaction is slightly limited due to values being 8 byte aligned.
4061 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4062 * and maybe it doesn't need to be.
4063 */
4064 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4065 (_sort_Fn)OopMapBlock::compare_offset);
4066 if (_nonstatic_oop_map_count < 2) {
4067 return;
4068 }
4069
4070 // Make a temp copy, and iterate through and copy back into the original
4071 ResourceMark rm;
4072 OopMapBlock* oop_maps_copy =
4073 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4074 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4075 copy(oop_maps_copy);
4076 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4077 unsigned int new_count = 1;
4078 oop_maps_copy++;
4079 while(oop_maps_copy < oop_maps_copy_end) {
4080 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4081 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4082 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4083 } else {
4084 nonstatic_oop_map++;
4085 new_count++;
4086 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4087 nonstatic_oop_map->set_count(oop_maps_copy->count());
4088 }
4089 oop_maps_copy++;
4090 }
4091 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4092 _nonstatic_oop_map_count = new_count;
4093 }
4094
4095 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4096 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4097 if (_nonstatic_oop_map_count > 0) {
4098 OopMapBlock* map = _nonstatic_oop_maps;
4099 OopMapBlock* last_map = last_oop_map();
4100 assert(map <= last_map, "Last less than first");
4101 while (map <= last_map) {
4102 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4103 map->offset() + map->offset_span() - heapOopSize, map->count());
4104 map++;
4105 }
4106 }
4107 }
4108
4109 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4110 print_on(st);
4111 }
4112
4113 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4114 assert(ik != nullptr, "invariant");
4115
4116 const InstanceKlass* const super = ik->super();
4117
4118 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4119 // in which case we don't have to register objects as finalizable
4120 if (!_has_empty_finalizer) {
4121 if (_has_finalizer ||
4122 (super != nullptr && super->has_finalizer())) {
4123 ik->set_has_finalizer();
4124 }
4125 }
4126
4127 #ifdef ASSERT
4128 bool f = false;
4129 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4130 vmSymbols::void_method_signature());
4131 if (InstanceKlass::is_finalization_enabled() &&
4132 (m != nullptr) && !m->is_empty_method()) {
4133 f = true;
4134 }
4135
4136 // Spec doesn't prevent agent from redefinition of empty finalizer.
4137 // Despite the fact that it's generally bad idea and redefined finalizer
4138 // will not work as expected we shouldn't abort vm in this case
4139 if (!ik->has_redefined_this_or_super()) {
4140 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4141 }
4142 #endif
4143
4144 // Check if this klass supports the java.lang.Cloneable interface
4145 if (vmClasses::Cloneable_klass_is_loaded()) {
4146 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4147 ik->set_is_cloneable();
4148 }
4149 }
4150
4151 // If it cannot be fast-path allocated, set a bit in the layout helper.
4152 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4153 assert(ik->size_helper() > 0, "layout_helper is initialized");
4154 if (ik->is_abstract() || ik->is_interface()
4155 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4156 || ik->size_helper() >= FastAllocateSizeLimit) {
4157 // Forbid fast-path allocation.
4158 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4159 ik->set_layout_helper(lh);
4160 }
4161
4162 // Propagate the AOT runtimeSetup method discovery
4163 if (_has_aot_runtime_setup_method) {
4164 ik->set_is_runtime_setup_required();
4165 if (log_is_enabled(Info, aot, init)) {
4166 ResourceMark rm;
4167 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4168 }
4169 }
4170 }
4171
4172 bool ClassFileParser::supports_inline_types() const {
4173 // Inline types are only supported by class file version 71.65535 and later
4174 return _major_version > JAVA_27_VERSION ||
4175 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4176 }
4177
4178 // utility methods for appending an array with check for duplicates
4179
4180 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4181 const Array<InstanceKlass*>* const ifs) {
4182 // iterate over new interfaces
4183 for (int i = 0; i < ifs->length(); i++) {
4184 InstanceKlass* const e = ifs->at(i);
4185 assert(e->is_klass() && e->is_interface(), "just checking");
4186 // add new interface
4187 result->append_if_missing(e);
4188 }
4189 }
4190
4191 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4192 Array<InstanceKlass*>* local_ifs,
4193 ClassLoaderData* loader_data,
4194 TRAPS) {
4195 assert(local_ifs != nullptr, "invariant");
4196 assert(loader_data != nullptr, "invariant");
4197
4198 // Compute maximum size for transitive interfaces
4199 int max_transitive_size = 0;
4200 int super_size = 0;
4201 // Add superclass transitive interfaces size
4202 if (super != nullptr) {
4203 super_size = super->transitive_interfaces()->length();
4204 max_transitive_size += super_size;
4205 }
4206 // Add local interfaces' super interfaces
4207 const int local_size = local_ifs->length();
4208 for (int i = 0; i < local_size; i++) {
4209 InstanceKlass* const l = local_ifs->at(i);
4210 max_transitive_size += l->transitive_interfaces()->length();
4211 }
4212 // Finally add local interfaces
4213 max_transitive_size += local_size;
4214 // Construct array
4215 if (max_transitive_size == 0) {
4216 // no interfaces, use canonicalized array
4217 return Universe::the_empty_instance_klass_array();
4218 } else if (max_transitive_size == super_size) {
4219 // no new local interfaces added, share superklass' transitive interface array
4220 return super->transitive_interfaces();
4221 // The three lines below are commented to work around bug JDK-8245487
4222 // } else if (max_transitive_size == local_size) {
4223 // // only local interfaces added, share local interface array
4224 // return local_ifs;
4225 } else {
4226 ResourceMark rm;
4227 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4228
4229 // Copy down from superclass
4230 if (super != nullptr) {
4231 append_interfaces(result, super->transitive_interfaces());
4232 }
4233
4234 // Copy down from local interfaces' superinterfaces
4235 for (int i = 0; i < local_size; i++) {
4236 InstanceKlass* const l = local_ifs->at(i);
4237 append_interfaces(result, l->transitive_interfaces());
4238 }
4239 // Finally add local interfaces
4240 append_interfaces(result, local_ifs);
4241
4242 // length will be less than the max_transitive_size if duplicates were removed
4243 const int length = result->length();
4244 assert(length <= max_transitive_size, "just checking");
4245
4246 Array<InstanceKlass*>* const new_result =
4247 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4248 for (int i = 0; i < length; i++) {
4249 InstanceKlass* const e = result->at(i);
4250 assert(e != nullptr, "just checking");
4251 new_result->at_put(i, e);
4252 }
4253 return new_result;
4254 }
4255 }
4256
4257 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4258 assert(this_klass != nullptr, "invariant");
4259 const InstanceKlass* const super = this_klass->super();
4260
4261 if (super != nullptr) {
4262 if (super->is_final()) {
4263 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4264 return;
4265 }
4266
4267 if (super->is_sealed()) {
4268 stringStream ss;
4269 ResourceMark rm(THREAD);
4270 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4271 classfile_icce_error(ss.as_string(), THREAD);
4272 return;
4273 }
4274 }
4275
4276 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4277 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4278 // for a value classes. So, it is treated as a special case for now.
4279 if (!this_klass->access_flags().is_identity_class() &&
4280 super->name() != vmSymbols::java_lang_Object() &&
4281 super->is_identity_class()) {
4282 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4283 return;
4284 }
4285
4286 Reflection::VerifyClassAccessResults vca_result =
4287 Reflection::verify_class_access(this_klass, super, false);
4288 if (vca_result != Reflection::ACCESS_OK) {
4289 ResourceMark rm(THREAD);
4290 char* msg = Reflection::verify_class_access_msg(this_klass,
4291 super,
4292 vca_result);
4293
4294 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4295 if (msg == nullptr) {
4296 bool same_module = (this_klass->module() == super->module());
4297 Exceptions::fthrow(
4298 THREAD_AND_LOCATION,
4299 vmSymbols::java_lang_IllegalAccessError(),
4300 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4301 this_klass->external_name(),
4302 super->is_abstract() ? "abstract " : "",
4303 super->external_name(),
4304 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4305 (same_module) ? "" : "; ",
4306 (same_module) ? "" : super->class_in_module_of_loader());
4307 } else {
4308 // Add additional message content.
4309 Exceptions::fthrow(
4310 THREAD_AND_LOCATION,
4311 vmSymbols::java_lang_IllegalAccessError(),
4312 "superclass access check failed: %s",
4313 msg);
4314 }
4315 }
4316 }
4317 }
4318
4319
4320 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4321 assert(this_klass != nullptr, "invariant");
4322 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4323 const int lng = local_interfaces->length();
4324 for (int i = lng - 1; i >= 0; i--) {
4325 InstanceKlass* const k = local_interfaces->at(i);
4326 assert (k != nullptr && k->is_interface(), "invalid interface");
4327
4328 if (k->is_sealed()) {
4329 stringStream ss;
4330 ResourceMark rm(THREAD);
4331 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4332 classfile_icce_error(ss.as_string(), THREAD);
4333 return;
4334 }
4335 }
4336
4337 Reflection::VerifyClassAccessResults vca_result =
4338 Reflection::verify_class_access(this_klass, k, false);
4339 if (vca_result != Reflection::ACCESS_OK) {
4340 ResourceMark rm(THREAD);
4341 char* msg = Reflection::verify_class_access_msg(this_klass,
4342 k,
4343 vca_result);
4344
4345 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4346 if (msg == nullptr) {
4347 bool same_module = (this_klass->module() == k->module());
4348 Exceptions::fthrow(
4349 THREAD_AND_LOCATION,
4350 vmSymbols::java_lang_IllegalAccessError(),
4351 "class %s cannot access its superinterface %s (%s%s%s)",
4352 this_klass->external_name(),
4353 k->external_name(),
4354 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4355 (same_module) ? "" : "; ",
4356 (same_module) ? "" : k->class_in_module_of_loader());
4357 return;
4358 } else {
4359 // Add additional message content.
4360 Exceptions::fthrow(
4361 THREAD_AND_LOCATION,
4362 vmSymbols::java_lang_IllegalAccessError(),
4363 "superinterface check failed: %s",
4364 msg);
4365 return;
4366 }
4367 }
4368 }
4369 }
4370
4371
4372 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4373 assert(this_klass != nullptr, "invariant");
4374 const Array<Method*>* const methods = this_klass->methods();
4375 const int num_methods = methods->length();
4376
4377 // go thru each method and check if it overrides a final method
4378 for (int index = 0; index < num_methods; index++) {
4379 const Method* const m = methods->at(index);
4380
4381 // skip private, static, and <init> methods
4382 if ((!m->is_private() && !m->is_static()) &&
4383 (m->name() != vmSymbols::object_initializer_name())) {
4384
4385 const Symbol* const name = m->name();
4386 const Symbol* const signature = m->signature();
4387 const InstanceKlass* k = this_klass->super();
4388 const Method* super_m = nullptr;
4389 while (k != nullptr) {
4390 // skip supers that don't have final methods.
4391 if (k->has_final_method()) {
4392 // lookup a matching method in the super class hierarchy
4393 super_m = k->lookup_method(name, signature);
4394 if (super_m == nullptr) {
4395 break; // didn't find any match; get out
4396 }
4397
4398 if (super_m->is_final() && !super_m->is_static() &&
4399 !super_m->access_flags().is_private()) {
4400 // matching method in super is final, and not static or private
4401 bool can_access = Reflection::verify_member_access(this_klass,
4402 super_m->method_holder(),
4403 super_m->method_holder(),
4404 super_m->access_flags(),
4405 false, false, CHECK);
4406 if (can_access) {
4407 // this class can access super final method and therefore override
4408 ResourceMark rm(THREAD);
4409 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4410 err_msg("class %s overrides final method %s.%s%s",
4411 this_klass->external_name(),
4412 super_m->method_holder()->external_name(),
4413 name->as_C_string(),
4414 signature->as_C_string()));
4415 }
4416 }
4417
4418 // continue to look from super_m's holder's super.
4419 k = super_m->method_holder()->super();
4420 continue;
4421 }
4422
4423 k = k->super();
4424 }
4425 }
4426 }
4427 }
4428
4429
4430 // assumes that this_klass is an interface
4431 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4432 assert(this_klass != nullptr, "invariant");
4433 assert(this_klass->is_interface(), "not an interface");
4434 const Array<Method*>* methods = this_klass->methods();
4435 const int num_methods = methods->length();
4436
4437 for (int index = 0; index < num_methods; index++) {
4438 const Method* const m = methods->at(index);
4439 // if m is static and not the init method, throw a verify error
4440 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4441 ResourceMark rm(THREAD);
4442
4443 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4444 Exceptions::fthrow(
4445 THREAD_AND_LOCATION,
4446 vmSymbols::java_lang_VerifyError(),
4447 "Illegal static method %s in interface %s",
4448 m->name()->as_C_string(),
4449 this_klass->external_name()
4450 );
4451 return;
4452 }
4453 }
4454 }
4455
4456 // utility methods for format checking
4457
4458 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4459 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4460 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4461 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4462 if (is_module) {
4463 ResourceMark rm(THREAD);
4464 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4465 Exceptions::fthrow(
4466 THREAD_AND_LOCATION,
4467 vmSymbols::java_lang_NoClassDefFoundError(),
4468 "%s is not a class because access_flag ACC_MODULE is set",
4469 _class_name->as_C_string());
4470 return;
4471 }
4472
4473 if (!_need_verify) { return; }
4474
4475 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4476 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4477 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4478 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4479 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4480 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4481 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4482 const bool valid_value_class = is_identity || is_interface ||
4483 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4484
4485 if ((is_abstract && is_final) ||
4486 (is_interface && !is_abstract) ||
4487 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4488 (!is_interface && major_gte_1_5 && is_annotation) ||
4489 (!valid_value_class)) {
4490 ResourceMark rm(THREAD);
4491 const char* class_note = "";
4492 if (!valid_value_class) {
4493 class_note = " (a value class must be final or else abstract)";
4494 }
4495 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4496 if (inner_name == nullptr && !is_anonymous_inner_class) {
4497 Exceptions::fthrow(
4498 THREAD_AND_LOCATION,
4499 vmSymbols::java_lang_ClassFormatError(),
4500 "Illegal class modifiers in class %s: 0x%X",
4501 _class_name->as_C_string(), flags
4502 );
4503 } else {
4504 if (is_anonymous_inner_class) {
4505 Exceptions::fthrow(
4506 THREAD_AND_LOCATION,
4507 vmSymbols::java_lang_ClassFormatError(),
4508 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4509 _class_name->as_C_string(), flags
4510 );
4511 } else {
4512 Exceptions::fthrow(
4513 THREAD_AND_LOCATION,
4514 vmSymbols::java_lang_ClassFormatError(),
4515 "Illegal class modifiers in inner class %s of class %s: 0x%X",
4516 inner_name->as_C_string(), _class_name->as_C_string(), flags
4517 );
4518 }
4519 }
4520 return;
4521 }
4522 }
4523
4524 static bool has_illegal_visibility(jint flags) {
4525 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4526 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4527 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4528
4529 return ((is_public && is_protected) ||
4530 (is_public && is_private) ||
4531 (is_protected && is_private));
4532 }
4533
4534 // A legal major_version.minor_version must be one of the following:
4535 //
4536 // Major_version >= 45 and major_version < 56, any minor_version.
4537 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4538 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4539 //
4540 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4541 ResourceMark rm(THREAD);
4542 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4543 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4544 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4545 class_name, major, minor, THREAD);
4546 return;
4547 }
4548
4549 if (major > max_version) {
4550 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4551 Exceptions::fthrow(
4552 THREAD_AND_LOCATION,
4553 vmSymbols::java_lang_UnsupportedClassVersionError(),
4554 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4555 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4556 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4557 return;
4558 }
4559
4560 if (major < JAVA_12_VERSION || minor == 0) {
4561 return;
4562 }
4563
4564 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4565 if (major != max_version) {
4566 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4567 Exceptions::fthrow(
4568 THREAD_AND_LOCATION,
4569 vmSymbols::java_lang_UnsupportedClassVersionError(),
4570 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4571 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4572 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4573 return;
4574 }
4575
4576 if (!Arguments::enable_preview()) {
4577 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4578 class_name, major, minor, THREAD);
4579 return;
4580 }
4581
4582 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4583 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4584 class_name, major, minor, THREAD);
4585 }
4586 }
4587
4588 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4589 AccessFlags class_access_flags,
4590 TRAPS) const {
4591 if (!_need_verify) { return; }
4592
4593 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4594 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4595 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4596 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4597 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4598 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4599 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4600 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4601 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4602 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4603
4604 const bool is_interface = class_access_flags.is_interface();
4605 const bool is_identity_class = class_access_flags.is_identity_class();
4606
4607 bool is_illegal = false;
4608 const char* error_msg = "";
4609
4610 // There is some overlap in the checks that apply, for example interface fields
4611 // must be static, static fields can't be strict, and therefore interfaces can't
4612 // have strict fields. So we don't have to check every possible invalid combination
4613 // individually as long as all are covered. Once we have found an illegal combination
4614 // we can stop checking.
4615
4616 if (!is_illegal) {
4617 if (is_interface) {
4618 if (!is_public || !is_static || !is_final || is_private ||
4619 is_protected || is_volatile || is_transient ||
4620 (major_gte_1_5 && is_enum)) {
4621 is_illegal = true;
4622 error_msg = "interface fields must be public, static and final, and may be synthetic";
4623 }
4624 } else { // not interface
4625 if (has_illegal_visibility(flags)) {
4626 is_illegal = true;
4627 error_msg = "invalid visibility flags for class field";
4628 } else if (is_final && is_volatile) {
4629 is_illegal = true;
4630 error_msg = "fields cannot be final and volatile";
4631 } else if (supports_inline_types()) {
4632 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4633 is_illegal = true;
4634 error_msg = "value class fields must be either non-static final and strict, or static";
4635 }
4636 }
4637 }
4638 }
4639
4640 if (is_illegal) {
4641 ResourceMark rm(THREAD);
4642 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4643 Exceptions::fthrow(
4644 THREAD_AND_LOCATION,
4645 vmSymbols::java_lang_ClassFormatError(),
4646 "Illegal field modifiers (%s) in class %s: 0x%X",
4647 error_msg, _class_name->as_C_string(), flags);
4648 return;
4649 }
4650 }
4651
4652 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4653 AccessFlags class_access_flags,
4654 const Symbol* name,
4655 TRAPS) const {
4656 if (!_need_verify) { return; }
4657
4658 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4659 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4660 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4661 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4662 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4663 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4664 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4665 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4666 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4667 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4668 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4669 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4670 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4671 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4672 // LW401 CR required: removal of value factories support
4673 const bool is_interface = class_access_flags.is_interface();
4674 const bool is_identity_class = class_access_flags.is_identity_class();
4675 const bool is_abstract_class = class_access_flags.is_abstract();
4676
4677 bool is_illegal = false;
4678
4679 const char* class_note = "";
4680 if (is_interface) {
4681 if (major_gte_8) {
4682 // Class file version is JAVA_8_VERSION or later Methods of
4683 // interfaces may set any of the flags except ACC_PROTECTED,
4684 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4685 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4686 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4687 (is_native || is_protected || is_final || is_synchronized) ||
4688 // If a specific method of a class or interface has its
4689 // ACC_ABSTRACT flag set, it must not have any of its
4690 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4691 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4692 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4693 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4694 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4695 is_illegal = true;
4696 }
4697 } else if (major_gte_1_5) {
4698 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4699 if (!is_public || is_private || is_protected || is_static || is_final ||
4700 is_synchronized || is_native || !is_abstract || is_strict) {
4701 is_illegal = true;
4702 }
4703 } else {
4704 // Class file version is pre-JAVA_1_5_VERSION
4705 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4706 is_illegal = true;
4707 }
4708 }
4709 } else { // not interface
4710 if (has_illegal_visibility(flags)) {
4711 is_illegal = true;
4712 } else {
4713 if (is_initializer) {
4714 if (is_static || is_final || is_synchronized || is_native ||
4715 is_abstract || (major_gte_1_5 && is_bridge)) {
4716 is_illegal = true;
4717 }
4718 } else { // not initializer
4719 if (!is_identity_class && is_synchronized && !is_static) {
4720 is_illegal = true;
4721 class_note = " (not an identity class)";
4722 } else {
4723 if (is_abstract) {
4724 if ((is_final || is_native || is_private || is_static ||
4725 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4726 is_illegal = true;
4727 }
4728 }
4729 }
4730 }
4731 }
4732 }
4733
4734 if (is_illegal) {
4735 ResourceMark rm(THREAD);
4736 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4737 Exceptions::fthrow(
4738 THREAD_AND_LOCATION,
4739 vmSymbols::java_lang_ClassFormatError(),
4740 "Method %s in class %s%s has illegal modifiers: 0x%X",
4741 name->as_C_string(), _class_name->as_C_string(),
4742 class_note, flags);
4743 return;
4744 }
4745 }
4746
4747 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4748 int length,
4749 TRAPS) const {
4750 assert(_need_verify, "only called when _need_verify is true");
4751 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4752 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4753 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4754 }
4755 }
4756
4757 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4758 // In class names, '/' separates unqualified names. This is verified in this function also.
4759 // Method names also may not contain the characters '<' or '>', unless <init>
4760 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4761 // method. Because these names have been checked as special cases before
4762 // calling this method in verify_legal_method_name.
4763 //
4764 // This method is also called from the modular system APIs in modules.cpp
4765 // to verify the validity of module and package names.
4766 bool ClassFileParser::verify_unqualified_name(const char* name,
4767 unsigned int length,
4768 int type) {
4769 if (length == 0) return false; // Must have at least one char.
4770 for (const char* p = name; p != name + length; p++) {
4771 switch(*p) {
4772 case JVM_SIGNATURE_DOT:
4773 case JVM_SIGNATURE_ENDCLASS:
4774 case JVM_SIGNATURE_ARRAY:
4775 // do not permit '.', ';', or '['
4776 return false;
4777 case JVM_SIGNATURE_SLASH:
4778 // check for '//' or leading or trailing '/' which are not legal
4779 // unqualified name must not be empty
4780 if (type == ClassFileParser::LegalClass) {
4781 if (p == name || p+1 >= name+length ||
4782 *(p+1) == JVM_SIGNATURE_SLASH) {
4783 return false;
4784 }
4785 } else {
4786 return false; // do not permit '/' unless it's class name
4787 }
4788 break;
4789 case JVM_SIGNATURE_SPECIAL:
4790 case JVM_SIGNATURE_ENDSPECIAL:
4791 // do not permit '<' or '>' in method names
4792 if (type == ClassFileParser::LegalMethod) {
4793 return false;
4794 }
4795 }
4796 }
4797 return true;
4798 }
4799
4800 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4801 if (_loadable_descriptors == nullptr) return false;
4802 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4803 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4804 if (class_name == klass) return true;
4805 }
4806 return false;
4807 }
4808
4809 // Take pointer to a UTF8 byte string (not NUL-terminated).
4810 // Skip over the longest part of the string that could
4811 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4812 // Return a pointer to just past the fieldname.
4813 // Return null if no fieldname at all was found, or in the case of slash_ok
4814 // being true, we saw consecutive slashes (meaning we were looking for a
4815 // qualified path but found something that was badly-formed).
4816 static const char* skip_over_field_name(const char* const name,
4817 bool slash_ok,
4818 unsigned int length) {
4819 const char* p;
4820 jboolean last_is_slash = false;
4821 jboolean not_first_ch = false;
4822
4823 for (p = name; p != name + length; not_first_ch = true) {
4824 const char* old_p = p;
4825 jchar ch = *p;
4826 if (ch < 128) {
4827 p++;
4828 // quick check for ascii
4829 if ((ch >= 'a' && ch <= 'z') ||
4830 (ch >= 'A' && ch <= 'Z') ||
4831 (ch == '_' || ch == '$') ||
4832 (not_first_ch && ch >= '0' && ch <= '9')) {
4833 last_is_slash = false;
4834 continue;
4835 }
4836 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4837 if (last_is_slash) {
4838 return nullptr; // Don't permit consecutive slashes
4839 }
4840 last_is_slash = true;
4841 continue;
4842 }
4843 }
4844 else {
4845 jint unicode_ch;
4846 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4847 p = tmp_p;
4848 last_is_slash = false;
4849 // Check if ch is Java identifier start or is Java identifier part
4850 // 4672820: call java.lang.Character methods directly without generating separate tables.
4851 EXCEPTION_MARK;
4852 // return value
4853 JavaValue result(T_BOOLEAN);
4854 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4855 JavaCallArguments args;
4856 args.push_int(unicode_ch);
4857
4858 if (not_first_ch) {
4859 // public static boolean isJavaIdentifierPart(char ch);
4860 JavaCalls::call_static(&result,
4861 vmClasses::Character_klass(),
4862 vmSymbols::isJavaIdentifierPart_name(),
4863 vmSymbols::int_bool_signature(),
4864 &args,
4865 THREAD);
4866 } else {
4867 // public static boolean isJavaIdentifierStart(char ch);
4868 JavaCalls::call_static(&result,
4869 vmClasses::Character_klass(),
4870 vmSymbols::isJavaIdentifierStart_name(),
4871 vmSymbols::int_bool_signature(),
4872 &args,
4873 THREAD);
4874 }
4875 if (HAS_PENDING_EXCEPTION) {
4876 CLEAR_PENDING_EXCEPTION;
4877 return nullptr;
4878 }
4879 if(result.get_jboolean()) {
4880 continue;
4881 }
4882 }
4883 return (not_first_ch) ? old_p : nullptr;
4884 }
4885 return (not_first_ch && !last_is_slash) ? p : nullptr;
4886 }
4887
4888 // Take pointer to a UTF8 byte string (not NUL-terminated).
4889 // Skip over the longest part of the string that could
4890 // be taken as a field signature. Allow "void" if void_ok.
4891 // Return a pointer to just past the signature.
4892 // Return null if no legal signature is found.
4893 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4894 bool void_ok,
4895 unsigned int length,
4896 TRAPS) const {
4897 unsigned int array_dim = 0;
4898 while (length > 0) {
4899 switch (signature[0]) {
4900 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4901 case JVM_SIGNATURE_BOOLEAN:
4902 case JVM_SIGNATURE_BYTE:
4903 case JVM_SIGNATURE_CHAR:
4904 case JVM_SIGNATURE_SHORT:
4905 case JVM_SIGNATURE_INT:
4906 case JVM_SIGNATURE_FLOAT:
4907 case JVM_SIGNATURE_LONG:
4908 case JVM_SIGNATURE_DOUBLE:
4909 return signature + 1;
4910 case JVM_SIGNATURE_CLASS:
4911 {
4912 if (_major_version < JAVA_1_5_VERSION) {
4913 signature++;
4914 length--;
4915 // Skip over the class name if one is there
4916 const char* const p = skip_over_field_name(signature, true, length);
4917 assert(p == nullptr || p > signature, "must parse one character at least");
4918 // The next character better be a semicolon
4919 if (p != nullptr && // Parse of field name succeeded.
4920 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4921 p[0] == JVM_SIGNATURE_ENDCLASS) {
4922 return p + 1;
4923 }
4924 }
4925 else {
4926 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4927 signature++;
4928 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4929 // Format check signature
4930 if (c != nullptr) {
4931 int newlen = pointer_delta_as_int(c, (char*) signature);
4932 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4933 if (!legal) {
4934 classfile_parse_error("Class name is empty or contains illegal character "
4935 "in descriptor in class file %s",
4936 THREAD);
4937 return nullptr;
4938 }
4939 return signature + newlen + 1;
4940 }
4941 }
4942 return nullptr;
4943 }
4944 case JVM_SIGNATURE_ARRAY:
4945 array_dim++;
4946 if (array_dim > 255) {
4947 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4948 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4949 return nullptr;
4950 }
4951 // The rest of what's there better be a legal signature
4952 signature++;
4953 length--;
4954 void_ok = false;
4955 break;
4956 default:
4957 return nullptr;
4958 }
4959 }
4960 return nullptr;
4961 }
4962
4963 // Checks if name is a legal class name.
4964 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4965 if (!_need_verify) { return; }
4966
4967 assert(name->refcount() > 0, "symbol must be kept alive");
4968 char* bytes = (char*)name->bytes();
4969 unsigned int length = name->utf8_length();
4970 bool legal = false;
4971
4972 if (length > 0) {
4973 const char* p;
4974 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4975 p = skip_over_field_signature(bytes, false, length, CHECK);
4976 legal = (p != nullptr) && ((p - bytes) == (int)length);
4977 } else if (_major_version < JAVA_1_5_VERSION) {
4978 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4979 p = skip_over_field_name(bytes, true, length);
4980 legal = (p != nullptr) && ((p - bytes) == (int)length);
4981 }
4982 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4983 && bytes[length - 1] == ';' ) {
4984 // Support for L...; descriptors
4985 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4986 } else {
4987 // 4900761: relax the constraints based on JSR202 spec
4988 // Class names may be drawn from the entire Unicode character set.
4989 // Identifiers between '/' must be unqualified names.
4990 // The utf8 string has been verified when parsing cpool entries.
4991 legal = verify_unqualified_name(bytes, length, LegalClass);
4992 }
4993 }
4994 if (!legal) {
4995 ResourceMark rm(THREAD);
4996 assert(_class_name != nullptr, "invariant");
4997 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4998 Exceptions::fthrow(
4999 THREAD_AND_LOCATION,
5000 vmSymbols::java_lang_ClassFormatError(),
5001 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5002 _class_name->as_C_string()
5003 );
5004 return;
5005 }
5006 }
5007
5008 // Checks if name is a legal field name.
5009 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5010 if (!_need_verify) { return; }
5011
5012 char* bytes = (char*)name->bytes();
5013 unsigned int length = name->utf8_length();
5014 bool legal = false;
5015
5016 if (length > 0) {
5017 if (_major_version < JAVA_1_5_VERSION) {
5018 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5019 const char* p = skip_over_field_name(bytes, false, length);
5020 legal = (p != nullptr) && ((p - bytes) == (int)length);
5021 }
5022 } else {
5023 // 4881221: relax the constraints based on JSR202 spec
5024 legal = verify_unqualified_name(bytes, length, LegalField);
5025 }
5026 }
5027
5028 if (!legal) {
5029 ResourceMark rm(THREAD);
5030 assert(_class_name != nullptr, "invariant");
5031 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5032 Exceptions::fthrow(
5033 THREAD_AND_LOCATION,
5034 vmSymbols::java_lang_ClassFormatError(),
5035 "Illegal field name \"%.*s\" in class %s", length, bytes,
5036 _class_name->as_C_string()
5037 );
5038 return;
5039 }
5040 }
5041
5042 // Checks if name is a legal method name.
5043 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5044 if (!_need_verify) { return; }
5045
5046 assert(name != nullptr, "method name is null");
5047 char* bytes = (char*)name->bytes();
5048 unsigned int length = name->utf8_length();
5049 bool legal = false;
5050
5051 if (length > 0) {
5052 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5053 if (name == vmSymbols::object_initializer_name() ||
5054 name == vmSymbols::class_initializer_name()) {
5055 legal = true;
5056 }
5057 } else if (_major_version < JAVA_1_5_VERSION) {
5058 const char* p;
5059 p = skip_over_field_name(bytes, false, length);
5060 legal = (p != nullptr) && ((p - bytes) == (int)length);
5061 } else {
5062 // 4881221: relax the constraints based on JSR202 spec
5063 legal = verify_unqualified_name(bytes, length, LegalMethod);
5064 }
5065 }
5066
5067 if (!legal) {
5068 ResourceMark rm(THREAD);
5069 assert(_class_name != nullptr, "invariant");
5070 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5071 Exceptions::fthrow(
5072 THREAD_AND_LOCATION,
5073 vmSymbols::java_lang_ClassFormatError(),
5074 "Illegal method name \"%.*s\" in class %s", length, bytes,
5075 _class_name->as_C_string()
5076 );
5077 return;
5078 }
5079 }
5080
5081 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5082 const char* const bytes = (const char*)signature->bytes();
5083 const unsigned int length = signature->utf8_length();
5084 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5085
5086 if (p == nullptr || (p - bytes) != (int)length) {
5087 return false;
5088 }
5089 return true;
5090 }
5091
5092 // Checks if signature is a legal field signature.
5093 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5094 const Symbol* signature,
5095 TRAPS) const {
5096 if (!_need_verify) { return; }
5097
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);
5101
5102 if (p == nullptr || (p - bytes) != (int)length) {
5103 throwIllegalSignature("Field", name, signature, CHECK);
5104 }
5105 }
5106
5107 // Check that the signature is compatible with the method name. For example,
5108 // check that <init> has a void signature.
5109 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5110 const Symbol* signature,
5111 TRAPS) const {
5112 if (!_need_verify) {
5113 return;
5114 }
5115
5116 // Class initializers cannot have args for class format version >= 51.
5117 if (name == vmSymbols::class_initializer_name() &&
5118 signature != vmSymbols::void_method_signature() &&
5119 _major_version >= JAVA_7_VERSION) {
5120 throwIllegalSignature("Method", name, signature, THREAD);
5121 return;
5122 }
5123
5124 int sig_length = signature->utf8_length();
5125 if (name->utf8_length() > 0 &&
5126 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5127 sig_length > 0 &&
5128 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5129 throwIllegalSignature("Method", name, signature, THREAD);
5130 }
5131 }
5132
5133 // Checks if signature is a legal method signature.
5134 // Returns number of parameters
5135 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5136 const Symbol* signature,
5137 TRAPS) const {
5138 if (!_need_verify) {
5139 // make sure caller's args_size will be less than 0 even for non-static
5140 // method so it will be recomputed in compute_size_of_parameters().
5141 return -2;
5142 }
5143
5144 unsigned int args_size = 0;
5145 const char* p = (const char*)signature->bytes();
5146 unsigned int length = signature->utf8_length();
5147 const char* nextp;
5148
5149 // The first character must be a '('
5150 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5151 length--;
5152 // Skip over legal field signatures
5153 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5154 while ((length > 0) && (nextp != nullptr)) {
5155 args_size++;
5156 if (p[0] == 'J' || p[0] == 'D') {
5157 args_size++;
5158 }
5159 length -= pointer_delta_as_int(nextp, p);
5160 p = nextp;
5161 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5162 }
5163 // The first non-signature thing better be a ')'
5164 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5165 length--;
5166 // Now we better just have a return value
5167 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5168 if (nextp && ((int)length == (nextp - p))) {
5169 return args_size;
5170 }
5171 }
5172 }
5173 // Report error
5174 throwIllegalSignature("Method", name, signature, THREAD);
5175 return 0;
5176 }
5177
5178 int ClassFileParser::static_field_size() const {
5179 assert(_layout_info != nullptr, "invariant");
5180 return _layout_info->_static_field_size;
5181 }
5182
5183 int ClassFileParser::total_oop_map_count() const {
5184 assert(_layout_info != nullptr, "invariant");
5185 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5186 }
5187
5188 jint ClassFileParser::layout_size() const {
5189 assert(_layout_info != nullptr, "invariant");
5190 return _layout_info->_instance_size;
5191 }
5192
5193 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5194 const Array<Method*>* methods) {
5195 assert(ik != nullptr, "invariant");
5196 assert(methods != nullptr, "invariant");
5197
5198 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5199 // (We used to do this lazily, but now we query it in Rewriter,
5200 // which is eagerly done for every method, so we might as well do it now,
5201 // when everything is fresh in memory.)
5202 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5203
5204 if (klass_id != vmSymbolID::NO_SID) {
5205 for (int j = 0; j < methods->length(); ++j) {
5206 Method* method = methods->at(j);
5207 method->init_intrinsic_id(klass_id);
5208
5209 if (CheckIntrinsics) {
5210 // Check if an intrinsic is defined for method 'method',
5211 // but the method is not annotated with @IntrinsicCandidate.
5212 if (method->intrinsic_id() != vmIntrinsics::_none &&
5213 !method->intrinsic_candidate()) {
5214 tty->print("Compiler intrinsic is defined for method [%s], "
5215 "but the method is not annotated with @IntrinsicCandidate.%s",
5216 method->name_and_sig_as_C_string(),
5217 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5218 );
5219 tty->cr();
5220 DEBUG_ONLY(vm_exit(1));
5221 }
5222 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5223 // but there is no intrinsic available for it.
5224 if (method->intrinsic_candidate() &&
5225 method->intrinsic_id() == vmIntrinsics::_none) {
5226 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5227 "but no compiler intrinsic is defined for the method.%s",
5228 method->name_and_sig_as_C_string(),
5229 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5230 );
5231 tty->cr();
5232 DEBUG_ONLY(vm_exit(1));
5233 }
5234 }
5235 } // end for
5236
5237 #ifdef ASSERT
5238 if (CheckIntrinsics) {
5239 // Check for orphan methods in the current class. A method m
5240 // of a class C is orphan if an intrinsic is defined for method m,
5241 // but class C does not declare m.
5242 // The check is potentially expensive, therefore it is available
5243 // only in debug builds.
5244
5245 for (auto id : EnumRange<vmIntrinsicID>{}) {
5246 if (vmIntrinsics::_compiledLambdaForm == id) {
5247 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5248 // generated for the JVM from a LambdaForm and therefore no method
5249 // is defined for it.
5250 continue;
5251 }
5252 if (vmIntrinsics::_blackhole == id) {
5253 // The _blackhole intrinsic is a special marker. No explicit method
5254 // is defined for it.
5255 continue;
5256 }
5257
5258 if (vmIntrinsics::class_for(id) == klass_id) {
5259 // Check if the current class contains a method with the same
5260 // name, flags, signature.
5261 bool match = false;
5262 for (int j = 0; j < methods->length(); ++j) {
5263 const Method* method = methods->at(j);
5264 if (method->intrinsic_id() == id) {
5265 match = true;
5266 break;
5267 }
5268 }
5269
5270 if (!match) {
5271 char buf[1000];
5272 tty->print("Compiler intrinsic is defined for method [%s], "
5273 "but the method is not available in class [%s].%s",
5274 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5275 ik->name()->as_C_string(),
5276 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5277 );
5278 tty->cr();
5279 DEBUG_ONLY(vm_exit(1));
5280 }
5281 }
5282 } // end for
5283 } // CheckIntrinsics
5284 #endif // ASSERT
5285 }
5286 }
5287
5288 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5289 const ClassInstanceInfo& cl_inst_info,
5290 TRAPS) {
5291 if (_klass != nullptr) {
5292 return _klass;
5293 }
5294
5295 InstanceKlass* const ik =
5296 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5297
5298 if (is_hidden()) {
5299 mangle_hidden_class_name(ik);
5300 }
5301
5302 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5303
5304 assert(_klass == ik, "invariant");
5305 return ik;
5306 }
5307
5308 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5309 bool changed_by_loadhook,
5310 const ClassInstanceInfo& cl_inst_info,
5311 TRAPS) {
5312 assert(ik != nullptr, "invariant");
5313
5314 // Set name and CLD before adding to CLD
5315 ik->set_class_loader_data(_loader_data);
5316 ik->set_class_loader_type();
5317 ik->set_name(_class_name);
5318
5319 // Add all classes to our internal class loader list here,
5320 // including classes in the bootstrap (null) class loader.
5321 const bool publicize = !is_internal();
5322
5323 _loader_data->add_class(ik, publicize);
5324
5325 set_klass_to_deallocate(ik);
5326
5327 assert(_layout_info != nullptr, "invariant");
5328 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5329 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5330 "sanity");
5331
5332 assert(ik->is_instance_klass(), "sanity");
5333 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5334
5335 // Fill in information already parsed
5336 ik->set_should_verify_class(_need_verify);
5337
5338 // Not yet: supers are done below to support the new subtype-checking fields
5339 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5340 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5341 ik->set_has_strict_static_fields(_has_strict_static_fields);
5342
5343 if (_layout_info->_is_naturally_atomic) {
5344 ik->set_is_naturally_atomic();
5345 }
5346
5347 if (_layout_info->_must_be_atomic) {
5348 ik->set_must_be_atomic();
5349 }
5350
5351 ik->set_static_oop_field_count(_static_oop_count);
5352
5353 // this transfers ownership of a lot of arrays from
5354 // the parser onto the InstanceKlass*
5355 apply_parsed_class_metadata(ik, _java_fields_count);
5356
5357 // can only set dynamic nest-host after static nest information is set
5358 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5359 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5360 }
5361
5362 // note that is not safe to use the fields in the parser from this point on
5363 assert(nullptr == _cp, "invariant");
5364 assert(nullptr == _fieldinfo_stream, "invariant");
5365 assert(nullptr == _fieldinfo_search_table, "invariant");
5366 assert(nullptr == _fields_status, "invariant");
5367 assert(nullptr == _methods, "invariant");
5368 assert(nullptr == _inner_classes, "invariant");
5369 assert(nullptr == _nest_members, "invariant");
5370 assert(nullptr == _loadable_descriptors, "invariant");
5371 assert(nullptr == _combined_annotations, "invariant");
5372 assert(nullptr == _record_components, "invariant");
5373 assert(nullptr == _permitted_subclasses, "invariant");
5374 assert(nullptr == _inline_layout_info_array, "invariant");
5375
5376 if (_has_localvariable_table) {
5377 ik->set_has_localvariable_table(true);
5378 }
5379
5380 if (_has_final_method) {
5381 ik->set_has_final_method();
5382 }
5383
5384 ik->copy_method_ordering(_method_ordering, CHECK);
5385 // The InstanceKlass::_methods_jmethod_ids cache
5386 // is managed on the assumption that the initial cache
5387 // size is equal to the number of methods in the class. If
5388 // that changes, then InstanceKlass::idnum_can_increment()
5389 // has to be changed accordingly.
5390 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5391
5392 ik->set_this_class_index(_this_class_index);
5393
5394 if (_is_hidden) {
5395 // _this_class_index is a CONSTANT_Class entry that refers to this
5396 // hidden class itself. If this class needs to refer to its own methods
5397 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5398 // _this_class_index. However, because this class is hidden (it's
5399 // not stored in SystemDictionary), _this_class_index cannot be resolved
5400 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5401 // Therefore, we must eagerly resolve _this_class_index now.
5402 ik->constants()->klass_at_put(_this_class_index, ik);
5403 }
5404
5405 ik->set_minor_version(_minor_version);
5406 ik->set_major_version(_major_version);
5407 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5408 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5409
5410 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5411
5412 // Set PackageEntry for this_klass
5413 oop cl = ik->class_loader();
5414 Handle clh = Handle(THREAD, cl);
5415 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5416 ik->set_package(cld, nullptr, CHECK);
5417
5418 const Array<Method*>* const methods = ik->methods();
5419 assert(methods != nullptr, "invariant");
5420 const int methods_len = methods->length();
5421
5422 check_methods_for_intrinsics(ik, methods);
5423
5424 // Fill in field values obtained by parse_classfile_attributes
5425 if (_parsed_annotations->has_any_annotations())
5426 _parsed_annotations->apply_to(ik);
5427
5428 apply_parsed_class_attributes(ik);
5429
5430 // Miranda methods
5431 if ((_num_miranda_methods > 0) ||
5432 // if this class introduced new miranda methods or
5433 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5434 // super class exists and this class inherited miranda methods
5435 ) {
5436 ik->set_has_miranda_methods(); // then set a flag
5437 }
5438
5439 // Fill in information needed to compute superclasses.
5440 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5441 ik->set_transitive_interfaces(_transitive_interfaces);
5442 ik->set_local_interfaces(_local_interfaces);
5443 _transitive_interfaces = nullptr;
5444 _local_interfaces = nullptr;
5445
5446 // Initialize itable offset tables
5447 klassItable::setup_itable_offset_table(ik);
5448
5449 // Compute transitive closure of interfaces this class implements
5450 // Do final class setup
5451 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5452 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5453 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5454 }
5455
5456 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5457 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5458 ik->set_has_contended_annotations(true);
5459 }
5460
5461 // Fill in has_finalizer and layout_helper
5462 set_precomputed_flags(ik);
5463
5464 // check if this class can access its super class
5465 check_super_class_access(ik, CHECK);
5466
5467 // check if this class can access its superinterfaces
5468 check_super_interface_access(ik, CHECK);
5469
5470 // check if this class overrides any final method
5471 check_final_method_override(ik, CHECK);
5472
5473 // reject static interface methods prior to Java 8
5474 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5475 check_illegal_static_method(ik, CHECK);
5476 }
5477
5478 // Obtain this_klass' module entry
5479 ModuleEntry* module_entry = ik->module();
5480 assert(module_entry != nullptr, "module_entry should always be set");
5481
5482 // Obtain java.lang.Module
5483 Handle module_handle(THREAD, module_entry->module_oop());
5484
5485 // Allocate mirror and initialize static fields
5486 java_lang_Class::create_mirror(ik,
5487 Handle(THREAD, _loader_data->class_loader()),
5488 module_handle,
5489 _protection_domain,
5490 cl_inst_info.class_data(),
5491 CHECK);
5492
5493 assert(_all_mirandas != nullptr, "invariant");
5494
5495 // Generate any default methods - default methods are public interface methods
5496 // that have a default implementation. This is new with Java 8.
5497 if (_has_nonstatic_concrete_methods) {
5498 DefaultMethods::generate_default_methods(ik,
5499 _all_mirandas,
5500 CHECK);
5501 }
5502
5503 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5504 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5505 !module_entry->has_default_read_edges()) {
5506 if (!module_entry->set_has_default_read_edges()) {
5507 // We won a potential race
5508 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5509 }
5510 }
5511
5512 if (is_inline_type()) {
5513 InlineKlass* vk = InlineKlass::cast(ik);
5514 vk->set_payload_alignment(_layout_info->_payload_alignment);
5515 vk->set_payload_offset(_layout_info->_payload_offset);
5516 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5517 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5518 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5519 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5520 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5521 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5522 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5523 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5524 vk->initialize_calling_convention(CHECK);
5525 }
5526
5527 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5528 && _class_name != vmSymbols::java_lang_Object() && UseAltSubstitutabilityMethod) {
5529 // Both abstract and concrete value classes need a field map for acmp
5530 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5531 // Current format of acmp maps:
5532 // All maps are stored contiguously in a single int array because it might
5533 // be too early to instantiate an Object array (to be investigated)
5534 // Format is:
5535 // [number_of_nonoop_entries][offset0][size[0][offset1][size1]...[oop_offset0][oop_offset1]...
5536 // ^ ^
5537 // | |
5538 // --------------------- Pair of integer describing a segment of
5539 // contiguous non-oop fields
5540 // First element is the number of segment of contiguous non-oop fields
5541 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5542 // the offset then the size.
5543 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5544 // per oop field, containing the offset of the field.
5545 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5546 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5547 typeArrayOop map = oopFactory::new_intArray(nonoop_acmp_map_size + oop_acmp_map_size + 1, CHECK);
5548 typeArrayHandle map_h(THREAD, map);
5549 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5550 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5551 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first);
5552 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second);
5553 }
5554 int oop_map_start = nonoop_acmp_map_size + 1;
5555 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5556 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5557 }
5558 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5559 }
5560
5561 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5562
5563 if (!is_internal()) {
5564 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5565
5566 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5567 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5568 log_is_enabled(Info, class, preview)) {
5569 ResourceMark rm;
5570 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5571 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5572 }
5573
5574 if (log_is_enabled(Debug, class, resolve)) {
5575 ResourceMark rm;
5576 // print out the superclass.
5577 const char * from = ik->external_name();
5578 if (ik->super() != nullptr) {
5579 log_debug(class, resolve)("%s %s (super)",
5580 from,
5581 ik->super()->external_name());
5582 }
5583 // print out each of the interface classes referred to by this class.
5584 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5585 if (local_interfaces != nullptr) {
5586 const int length = local_interfaces->length();
5587 for (int i = 0; i < length; i++) {
5588 const InstanceKlass* const k = local_interfaces->at(i);
5589 const char * to = k->external_name();
5590 log_debug(class, resolve)("%s %s (interface)", from, to);
5591 }
5592 }
5593 }
5594 }
5595
5596 // If we reach here, all is well.
5597 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5598 // in order for it to not be destroyed in the ClassFileParser destructor.
5599 set_klass_to_deallocate(nullptr);
5600
5601 // it's official
5602 set_klass(ik);
5603
5604 DEBUG_ONLY(ik->verify();)
5605 }
5606
5607 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5608 // Decrement the refcount in the old name, since we're clobbering it.
5609 _class_name->decrement_refcount();
5610
5611 _class_name = new_class_name;
5612 // Increment the refcount of the new name.
5613 // Now the ClassFileParser owns this name and will decrement in
5614 // the destructor.
5615 _class_name->increment_refcount();
5616 }
5617
5618 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5619 Symbol* name,
5620 ClassLoaderData* loader_data,
5621 const ClassLoadInfo* cl_info,
5622 Publicity pub_level,
5623 TRAPS) :
5624 _stream(stream),
5625 _class_name(nullptr),
5626 _loader_data(loader_data),
5627 _is_hidden(cl_info->is_hidden()),
5628 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5629 _orig_cp_size(0),
5630 _static_oop_count(0),
5631 _super_klass(),
5632 _cp(nullptr),
5633 _fieldinfo_stream(nullptr),
5634 _fieldinfo_search_table(nullptr),
5635 _fields_status(nullptr),
5636 _methods(nullptr),
5637 _inner_classes(nullptr),
5638 _nest_members(nullptr),
5639 _nest_host(0),
5640 _permitted_subclasses(nullptr),
5641 _loadable_descriptors(nullptr),
5642 _record_components(nullptr),
5643 _local_interfaces(nullptr),
5644 _local_interface_indexes(nullptr),
5645 _transitive_interfaces(nullptr),
5646 _combined_annotations(nullptr),
5647 _class_annotations(nullptr),
5648 _class_type_annotations(nullptr),
5649 _fields_annotations(nullptr),
5650 _fields_type_annotations(nullptr),
5651 _klass(nullptr),
5652 _klass_to_deallocate(nullptr),
5653 _parsed_annotations(nullptr),
5654 _layout_info(nullptr),
5655 _inline_layout_info_array(nullptr),
5656 _temp_field_info(nullptr),
5657 _method_ordering(nullptr),
5658 _all_mirandas(nullptr),
5659 _vtable_size(0),
5660 _itable_size(0),
5661 _num_miranda_methods(0),
5662 _protection_domain(cl_info->protection_domain()),
5663 _access_flags(),
5664 _pub_level(pub_level),
5665 _bad_constant_seen(0),
5666 _synthetic_flag(false),
5667 _sde_length(false),
5668 _sde_buffer(nullptr),
5669 _sourcefile_index(0),
5670 _generic_signature_index(0),
5671 _major_version(0),
5672 _minor_version(0),
5673 _this_class_index(0),
5674 _super_class_index(0),
5675 _itfs_len(0),
5676 _java_fields_count(0),
5677 _need_verify(false),
5678 _has_nonstatic_concrete_methods(false),
5679 _declares_nonstatic_concrete_methods(false),
5680 _has_localvariable_table(false),
5681 _has_final_method(false),
5682 _has_contended_fields(false),
5683 _has_aot_runtime_setup_method(false),
5684 _has_strict_static_fields(false),
5685 _has_inline_type_fields(false),
5686 _is_naturally_atomic(false),
5687 _must_be_atomic(true),
5688 _has_loosely_consistent_annotation(false),
5689 _has_finalizer(false),
5690 _has_empty_finalizer(false),
5691 _max_bootstrap_specifier_index(-1) {
5692
5693 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5694 _class_name->increment_refcount();
5695
5696 assert(_loader_data != nullptr, "invariant");
5697 assert(stream != nullptr, "invariant");
5698 assert(_stream != nullptr, "invariant");
5699 assert(_stream->buffer() == _stream->current(), "invariant");
5700 assert(_class_name != nullptr, "invariant");
5701 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5702
5703 // Figure out whether we can skip format checking (matching classic VM behavior)
5704 // Always verify CFLH bytes from the user agents.
5705 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5706
5707 // synch back verification state to stream to check for truncation.
5708 stream->set_need_verify(_need_verify);
5709
5710 parse_stream(stream, CHECK);
5711
5712 post_process_parsed_stream(stream, _cp, CHECK);
5713 }
5714
5715 void ClassFileParser::clear_class_metadata() {
5716 // metadata created before the instance klass is created. Must be
5717 // deallocated if classfile parsing returns an error.
5718 _cp = nullptr;
5719 _fieldinfo_stream = nullptr;
5720 _fieldinfo_search_table = nullptr;
5721 _fields_status = nullptr;
5722 _methods = nullptr;
5723 _inner_classes = nullptr;
5724 _nest_members = nullptr;
5725 _permitted_subclasses = nullptr;
5726 _loadable_descriptors = nullptr;
5727 _combined_annotations = nullptr;
5728 _class_annotations = _class_type_annotations = nullptr;
5729 _fields_annotations = _fields_type_annotations = nullptr;
5730 _record_components = nullptr;
5731 _inline_layout_info_array = nullptr;
5732 }
5733
5734 // Destructor to clean up
5735 ClassFileParser::~ClassFileParser() {
5736 _class_name->decrement_refcount();
5737
5738 if (_cp != nullptr) {
5739 MetadataFactory::free_metadata(_loader_data, _cp);
5740 }
5741
5742 if (_fieldinfo_stream != nullptr) {
5743 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5744 }
5745 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5746
5747 if (_fields_status != nullptr) {
5748 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5749 }
5750
5751 if (_inline_layout_info_array != nullptr) {
5752 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5753 }
5754
5755 if (_methods != nullptr) {
5756 // Free methods
5757 InstanceKlass::deallocate_methods(_loader_data, _methods);
5758 }
5759
5760 // beware of the Universe::empty_blah_array!!
5761 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5762 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5763 }
5764
5765 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5766 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5767 }
5768
5769 if (_record_components != nullptr) {
5770 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5771 }
5772
5773 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5774 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5775 }
5776
5777 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5778 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5779 }
5780
5781 // Free interfaces
5782 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5783 _local_interfaces, _transitive_interfaces);
5784
5785 if (_combined_annotations != nullptr) {
5786 // After all annotations arrays have been created, they are installed into the
5787 // Annotations object that will be assigned to the InstanceKlass being created.
5788
5789 // Deallocate the Annotations object and the installed annotations arrays.
5790 _combined_annotations->deallocate_contents(_loader_data);
5791
5792 // If the _combined_annotations pointer is non-null,
5793 // then the other annotations fields should have been cleared.
5794 assert(_class_annotations == nullptr, "Should have been cleared");
5795 assert(_class_type_annotations == nullptr, "Should have been cleared");
5796 assert(_fields_annotations == nullptr, "Should have been cleared");
5797 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5798 } else {
5799 // If the annotations arrays were not installed into the Annotations object,
5800 // then they have to be deallocated explicitly.
5801 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5802 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5803 Annotations::free_contents(_loader_data, _fields_annotations);
5804 Annotations::free_contents(_loader_data, _fields_type_annotations);
5805 }
5806
5807 clear_class_metadata();
5808 _transitive_interfaces = nullptr;
5809 _local_interfaces = nullptr;
5810
5811 // deallocate the klass if already created. Don't directly deallocate, but add
5812 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5813 // at a safepoint.
5814 if (_klass_to_deallocate != nullptr) {
5815 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5816 }
5817 }
5818
5819 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5820 TRAPS) {
5821
5822 assert(stream != nullptr, "invariant");
5823 assert(_class_name != nullptr, "invariant");
5824
5825 // BEGIN STREAM PARSING
5826 stream->guarantee_more(8, CHECK); // magic, major, minor
5827 // Magic value
5828 const u4 magic = stream->get_u4_fast();
5829 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5830 "Incompatible magic value %u in class file %s",
5831 magic, CHECK);
5832
5833 // Version numbers
5834 _minor_version = stream->get_u2_fast();
5835 _major_version = stream->get_u2_fast();
5836
5837 // Check version numbers - we check this even with verifier off
5838 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5839
5840 stream->guarantee_more(3, CHECK); // length, first cp tag
5841 u2 cp_size = stream->get_u2_fast();
5842
5843 guarantee_property(
5844 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5845 cp_size, CHECK);
5846
5847 _orig_cp_size = cp_size;
5848 if (is_hidden()) { // Add a slot for hidden class name.
5849 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK);
5850 cp_size++;
5851 }
5852
5853 _cp = ConstantPool::allocate(_loader_data,
5854 cp_size,
5855 CHECK);
5856
5857 ConstantPool* const cp = _cp;
5858
5859 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5860
5861 assert(cp_size == (u2)cp->length(), "invariant");
5862
5863 // ACCESS FLAGS
5864 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5865
5866 // Access flags
5867 u2 flags;
5868 // JVM_ACC_MODULE is defined in JDK-9 and later.
5869 if (_major_version >= JAVA_9_VERSION) {
5870 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5871 } else {
5872 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5873 }
5874
5875 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5876 // Set abstract bit for old class files for backward compatibility
5877 flags |= JVM_ACC_ABSTRACT;
5878 }
5879
5880 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5881 if (!supports_inline_types()) {
5882 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5883 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5884 if (!is_module && !is_interface) {
5885 flags |= JVM_ACC_IDENTITY;
5886 }
5887 }
5888
5889 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5890
5891 short bad_constant = class_bad_constant_seen();
5892 if (bad_constant != 0) {
5893 // Do not throw CFE until after the access_flags are checked because if
5894 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5895 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5896 return;
5897 }
5898
5899 _access_flags.set_flags(flags);
5900
5901 // This class and superclass
5902 _this_class_index = stream->get_u2_fast();
5903 guarantee_property(
5904 valid_cp_range(_this_class_index, cp_size) &&
5905 cp->tag_at(_this_class_index).is_unresolved_klass(),
5906 "Invalid this class index %u in constant pool in class file %s",
5907 _this_class_index, CHECK);
5908
5909 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5910 assert(class_name_in_cp != nullptr, "class_name can't be null");
5911
5912 // Don't need to check whether this class name is legal or not.
5913 // It has been checked when constant pool is parsed.
5914 // However, make sure it is not an array type.
5915 if (_need_verify) {
5916 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5917 "Bad class name in class file %s",
5918 CHECK);
5919 }
5920
5921 #ifdef ASSERT
5922 // Basic sanity checks
5923 if (_is_hidden) {
5924 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5925 }
5926 #endif
5927
5928 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5929
5930 if (_is_hidden) {
5931 assert(_class_name != nullptr, "Unexpected null _class_name");
5932 #ifdef ASSERT
5933 if (_need_verify) {
5934 verify_legal_class_name(_class_name, CHECK);
5935 }
5936 #endif
5937
5938 } else {
5939 // Check if name in class file matches given name
5940 if (_class_name != class_name_in_cp) {
5941 if (_class_name != vmSymbols::unknown_class_name()) {
5942 ResourceMark rm(THREAD);
5943 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5944 Exceptions::fthrow(THREAD_AND_LOCATION,
5945 vmSymbols::java_lang_NoClassDefFoundError(),
5946 "%s (wrong name: %s)",
5947 _class_name->as_C_string(),
5948 class_name_in_cp->as_C_string()
5949 );
5950 return;
5951 } else {
5952 // The class name was not known by the caller so we set it from
5953 // the value in the CP.
5954 update_class_name(class_name_in_cp);
5955 }
5956 // else nothing to do: the expected class name matches what is in the CP
5957 }
5958 }
5959
5960 // Verification prevents us from creating names with dots in them, this
5961 // asserts that that's the case.
5962 assert(is_internal_format(_class_name), "external class name format used internally");
5963
5964 if (!is_internal()) {
5965 LogTarget(Debug, class, preorder) lt;
5966 if (lt.is_enabled()){
5967 ResourceMark rm(THREAD);
5968 LogStream ls(lt);
5969 ls.print("%s", _class_name->as_klass_external_name());
5970 if (stream->source() != nullptr) {
5971 ls.print(" source: %s", stream->source());
5972 }
5973 ls.cr();
5974 }
5975 }
5976
5977 // SUPERKLASS
5978 _super_class_index = stream->get_u2_fast();
5979 check_super_class(cp,
5980 _super_class_index,
5981 _need_verify,
5982 CHECK);
5983
5984 // Interfaces
5985 _itfs_len = stream->get_u2_fast();
5986 parse_interfaces(stream,
5987 _itfs_len,
5988 cp,
5989 &_has_nonstatic_concrete_methods,
5990 CHECK);
5991
5992 // Fields (offsets are filled in later)
5993 parse_fields(stream,
5994 _access_flags,
5995 cp,
5996 cp_size,
5997 &_java_fields_count,
5998 CHECK);
5999
6000 assert(_temp_field_info != nullptr, "invariant");
6001
6002 // Methods
6003 parse_methods(stream,
6004 is_interface(),
6005 !is_identity_class(),
6006 is_abstract_class(),
6007 &_has_localvariable_table,
6008 &_has_final_method,
6009 &_declares_nonstatic_concrete_methods,
6010 CHECK);
6011
6012 assert(_methods != nullptr, "invariant");
6013
6014 if (_declares_nonstatic_concrete_methods) {
6015 _has_nonstatic_concrete_methods = true;
6016 }
6017
6018 // Additional attributes/annotations
6019 _parsed_annotations = new ClassAnnotationCollector();
6020 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6021
6022 assert(_inner_classes != nullptr, "invariant");
6023
6024 // Finalize the Annotations metadata object,
6025 // now that all annotation arrays have been created.
6026 create_combined_annotations(CHECK);
6027
6028 // Make sure this is the end of class file stream
6029 guarantee_property(stream->at_eos(),
6030 "Extra bytes at the end of class file %s",
6031 CHECK);
6032
6033 // all bytes in stream read and parsed
6034 }
6035
6036 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6037 ResourceMark rm;
6038 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6039 // use a '/' because that confuses finding the class's package. Also, can't
6040 // use an illegal char such as ';' because that causes serialization issues
6041 // and issues with hidden classes that create their own hidden classes.
6042 char addr_buf[20];
6043 if (CDSConfig::is_dumping_static_archive()) {
6044 // We want stable names for the archived hidden classes (only for static
6045 // archive for now). Spaces under default_SharedBaseAddress() will be
6046 // occupied by the archive at run time, so we know that no dynamically
6047 // loaded InstanceKlass will be placed under there.
6048 static volatile size_t counter = 0;
6049 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6050 size_t new_id = AtomicAccess::add(&counter, (size_t)1);
6051 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
6052 } else {
6053 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6054 }
6055 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6056 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6057 jio_snprintf(new_name, new_name_len, "%s+%s",
6058 _class_name->as_C_string(), addr_buf);
6059 update_class_name(SymbolTable::new_symbol(new_name));
6060
6061 // Add a Utf8 entry containing the hidden name.
6062 assert(_class_name != nullptr, "Unexpected null _class_name");
6063 int hidden_index = _orig_cp_size; // this is an extra slot we added
6064 _cp->symbol_at_put(hidden_index, _class_name);
6065
6066 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6067 // We have to update the resolved_klass_index and the name_index together
6068 // so extract the existing resolved_klass_index first.
6069 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6070 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6071 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6072 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6073 "Bad name_index");
6074 }
6075
6076 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6077 ConstantPool* cp,
6078 TRAPS) {
6079 assert(stream != nullptr, "invariant");
6080 assert(stream->at_eos(), "invariant");
6081 assert(cp != nullptr, "invariant");
6082 assert(_loader_data != nullptr, "invariant");
6083
6084 if (_class_name == vmSymbols::java_lang_Object()) {
6085 precond(_super_class_index == 0);
6086 precond(_super_klass == nullptr);
6087 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6088 "java.lang.Object cannot implement an interface in class file %s",
6089 CHECK);
6090 } else {
6091 // Set _super_klass after class file is parsed and format is checked
6092 assert(_super_class_index > 0, "any class other than Object must have a super class");
6093 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6094 if (is_interface()) {
6095 // Before attempting to resolve the superclass, check for class format
6096 // errors not checked yet.
6097 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6098 "Interfaces must have java.lang.Object as superclass in class file %s",
6099 CHECK);
6100 }
6101 Handle loader(THREAD, _loader_data->class_loader());
6102 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6103 // fast path to avoid lookup
6104 _super_klass = vmClasses::Object_klass();
6105 } else {
6106 _super_klass = (const InstanceKlass*)
6107 SystemDictionary::resolve_super_or_fail(_class_name,
6108 super_class_name,
6109 loader,
6110 true,
6111 CHECK);
6112 }
6113 }
6114
6115 if (_super_klass != nullptr) {
6116 if (_super_klass->is_interface()) {
6117 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6118 return;
6119 }
6120
6121 if (_super_klass->is_final()) {
6122 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6123 return;
6124 }
6125
6126 if (Arguments::is_valhalla_enabled()) {
6127 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6128 }
6129
6130 if (_super_klass->has_nonstatic_concrete_methods()) {
6131 _has_nonstatic_concrete_methods = true;
6132 }
6133 }
6134
6135 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6136 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6137 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6138 _class_name->as_klass_external_name()));
6139 }
6140
6141 // Determining if the class allows tearing or not (default is not)
6142 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6143 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6144 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6145 // Conditions above are not sufficient to determine atomicity requirements,
6146 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6147 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6148 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6149 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6150 _must_be_atomic = false;
6151 }
6152 // Apply VM options override
6153 if (*ForceNonTearable != '\0') {
6154 // Allow a command line switch to force the same atomicity property:
6155 const char* class_name_str = _class_name->as_C_string();
6156 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6157 _must_be_atomic = true;
6158 }
6159 }
6160 }
6161
6162 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6163 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6164 if (_local_interface_indexes != nullptr) {
6165 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6166 u2 interface_index = _local_interface_indexes->at(i);
6167 Klass* interf;
6168 if (cp->tag_at(interface_index).is_klass()) {
6169 interf = cp->resolved_klass_at(interface_index);
6170 } else {
6171 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6172
6173 // Don't need to check legal name because it's checked when parsing constant pool.
6174 // But need to make sure it's not an array type.
6175 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6176 "Bad interface name in class file %s", CHECK);
6177
6178 // Call resolve on the interface class name with class circularity checking
6179 interf = SystemDictionary::resolve_super_or_fail(
6180 _class_name,
6181 unresolved_klass,
6182 Handle(THREAD, _loader_data->class_loader()),
6183 false,
6184 CHECK);
6185 }
6186
6187 if (!interf->is_interface()) {
6188 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6189 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6190 _class_name->as_klass_external_name(),
6191 interf->external_name(),
6192 interf->class_in_module_of_loader()));
6193 }
6194
6195 if (Arguments::is_valhalla_enabled()) {
6196 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6197 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6198 }
6199
6200 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6201 _has_nonstatic_concrete_methods = true;
6202 }
6203 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6204 }
6205 }
6206 assert(_local_interfaces != nullptr, "invariant");
6207
6208 // Compute the transitive list of all unique interfaces implemented by this class
6209 _transitive_interfaces =
6210 compute_transitive_interfaces(_super_klass,
6211 _local_interfaces,
6212 _loader_data,
6213 CHECK);
6214
6215 assert(_transitive_interfaces != nullptr, "invariant");
6216
6217 // sort methods
6218 _method_ordering = sort_methods(_methods);
6219
6220 _all_mirandas = new GrowableArray<Method*>(20);
6221
6222 Handle loader(THREAD, _loader_data->class_loader());
6223 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6224 &_num_miranda_methods,
6225 _all_mirandas,
6226 _super_klass,
6227 _methods,
6228 _access_flags,
6229 _major_version,
6230 loader,
6231 _class_name,
6232 _local_interfaces);
6233
6234 // Size of Java itable (in words)
6235 _itable_size = is_interface() ? 0 :
6236 klassItable::compute_itable_size(_transitive_interfaces);
6237
6238 assert(_parsed_annotations != nullptr, "invariant");
6239
6240 if (Arguments::is_valhalla_enabled()) {
6241 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6242 java_fields_count(),
6243 CHECK);
6244 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6245 FieldInfo fieldinfo = *it;
6246 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6247 Symbol* sig = fieldinfo.signature(cp);
6248 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6249 // Pre-load classes of null-free fields that are candidate for flattening
6250 TempNewSymbol s = Signature::strip_envelope(sig);
6251 if (s == _class_name) {
6252 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6253 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6254 }
6255 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6256 "Cause: a null-free non-static field is declared with this type",
6257 s->as_C_string(), _class_name->as_C_string());
6258 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection(_class_name, s,
6259 Handle(THREAD,
6260 _loader_data->class_loader()),
6261 false, THREAD);
6262 if (HAS_PENDING_EXCEPTION) {
6263 log_info(class, preload)("Preloading of class %s during loading of class %s "
6264 "(cause: null-free non-static field) failed: %s",
6265 s->as_C_string(), _class_name->as_C_string(),
6266 PENDING_EXCEPTION->klass()->name()->as_C_string());
6267 return; // Exception is still pending
6268 }
6269 assert(klass != nullptr, "Sanity check");
6270 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6271 InlineKlass* vk = InlineKlass::cast(klass);
6272 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6273 log_info(class, preload)("Preloading of class %s during loading of class %s "
6274 "(cause: null-free non-static field) succeeded",
6275 s->as_C_string(), _class_name->as_C_string());
6276 } else if (Signature::has_envelope(sig) && PreloadClasses) {
6277 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6278 // Those classes would be required later for the flattening of nullable inline type fields
6279 TempNewSymbol name = Signature::strip_envelope(sig);
6280 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6281 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6282 "Cause: field type in LoadableDescriptors attribute",
6283 name->as_C_string(), _class_name->as_C_string());
6284 oop loader = loader_data()->class_loader();
6285 Klass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6286 Handle(THREAD, loader),
6287 false, THREAD);
6288 if (klass != nullptr) {
6289 if (klass->is_inline_klass()) {
6290 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6291 log_info(class, preload)("Preloading of class %s during loading of class %s "
6292 "(cause: field type in LoadableDescriptors attribute) succeeded",
6293 name->as_C_string(), _class_name->as_C_string());
6294 } else {
6295 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6296 log_info(class, preload)("Preloading of class %s during loading of class %s "
6297 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6298 name->as_C_string(), _class_name->as_C_string());
6299 }
6300 } else {
6301 log_info(class, preload)("Preloading of class %s during loading of class %s "
6302 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6303 name->as_C_string(), _class_name->as_C_string(),
6304 PENDING_EXCEPTION->klass()->name()->as_C_string());
6305 }
6306 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6307 if (HAS_PENDING_EXCEPTION) {
6308 CLEAR_PENDING_EXCEPTION;
6309 }
6310 } else {
6311 // Just poking the system dictionary to see if the class has already be loaded. Looking for migrated classes
6312 // used when --enable-preview when jdk isn't compiled with --enable-preview so doesn't include LoadableDescriptors.
6313 // This is temporary.
6314 oop loader = loader_data()->class_loader();
6315 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6316 if (klass != nullptr && klass->is_inline_klass()) {
6317 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6318 log_info(class, preload)("Preloading of class %s during loading of class %s "
6319 "(cause: field type not in LoadableDescriptors attribute) succeeded",
6320 name->as_C_string(), _class_name->as_C_string());
6321 }
6322 }
6323 }
6324 }
6325 }
6326
6327 _layout_info = new FieldLayoutInfo();
6328 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6329 _parsed_annotations->is_contended(), is_inline_type(),
6330 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6331 _must_be_atomic, _layout_info, _inline_layout_info_array);
6332 lb.build_layout();
6333 _has_inline_type_fields = _layout_info->_has_inline_fields;
6334
6335 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6336 _fieldinfo_stream =
6337 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6338 injected_fields_count, loader_data(), CHECK);
6339 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6340 _fields_status =
6341 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6342 FieldStatus(0), CHECK);
6343
6344 // Strict static fields track initialization status from the beginning of time.
6345 // After this class runs <clinit>, they will be verified as being "not unset".
6346 // See Step 8 of InstanceKlass::initialize_impl.
6347 if (_has_strict_static_fields) {
6348 bool found_one = false;
6349 for (int i = 0; i < _temp_field_info->length(); i++) {
6350 FieldInfo& fi = *_temp_field_info->adr_at(i);
6351 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6352 found_one = true;
6353 if (fi.initializer_index() != 0) {
6354 // skip strict static fields with ConstantValue attributes
6355 } else {
6356 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6357 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6358 }
6359 }
6360 }
6361 assert(found_one == _has_strict_static_fields,
6362 "correct prediction = %d", (int)_has_strict_static_fields);
6363 }
6364 }
6365
6366 void ClassFileParser::set_klass(InstanceKlass* klass) {
6367
6368 #ifdef ASSERT
6369 if (klass != nullptr) {
6370 assert(nullptr == _klass, "leaking?");
6371 }
6372 #endif
6373
6374 _klass = klass;
6375 }
6376
6377 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6378
6379 #ifdef ASSERT
6380 if (klass != nullptr) {
6381 assert(nullptr == _klass_to_deallocate, "leaking?");
6382 }
6383 #endif
6384
6385 _klass_to_deallocate = klass;
6386 }
6387
6388 // Caller responsible for ResourceMark
6389 // clone stream with rewound position
6390 const ClassFileStream* ClassFileParser::clone_stream() const {
6391 assert(_stream != nullptr, "invariant");
6392
6393 return _stream->clone();
6394 }
6395
6396 ReferenceType ClassFileParser::super_reference_type() const {
6397 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6398 }
6399
6400 bool ClassFileParser::is_instance_ref_klass() const {
6401 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6402 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6403 // klass requiring special treatment in ref-processing. The abstract
6404 // j.l.r.Reference cannot be instantiated so doesn't partake in
6405 // ref-processing.
6406 return is_java_lang_ref_Reference_subclass();
6407 }
6408
6409 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6410 if (_super_klass == nullptr) {
6411 return false;
6412 }
6413
6414 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6415 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6416 return true;
6417 }
6418
6419 return _super_klass->reference_type() != REF_NONE;
6420 }
6421
6422 // ----------------------------------------------------------------------------
6423 // debugging
6424
6425 #ifdef ASSERT
6426
6427 // return true if class_name contains no '.' (internal format is '/')
6428 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6429 if (class_name != nullptr) {
6430 ResourceMark rm;
6431 char* name = class_name->as_C_string();
6432 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6433 } else {
6434 return true;
6435 }
6436 }
6437
6438 #endif