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 "oops/inlineKlass.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoadInfo.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.hpp"
52 #include "oops/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/formatBuffer.hpp"
84 #include "utilities/exceptions.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/resourceHash.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95 #if INCLUDE_JFR
96 #include "jfr/support/jfrTraceIdExtension.hpp"
97 #endif
98
99 // We generally try to create the oops directly when parsing, rather than
100 // allocating temporary data structures and copying the bytes twice. A
101 // temporary area is only needed when parsing utf8 entries in the constant
102 // pool and when parsing line number tables.
103
104 // We add assert in debug mode when class format is not checked.
105
106 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
107 #define JAVA_MIN_SUPPORTED_VERSION 45
108 #define JAVA_PREVIEW_MINOR_VERSION 65535
109
110 // Used for two backward compatibility reasons:
111 // - to check for new additions to the class file format in JDK1.5
112 // - to check for bug fixes in the format checker in JDK1.5
113 #define JAVA_1_5_VERSION 49
114
115 // Used for backward compatibility reasons:
116 // - to check for javac bug fixes that happened after 1.5
117 // - also used as the max version when running in jdk6
118 #define JAVA_6_VERSION 50
119
120 // Used for backward compatibility reasons:
121 // - to disallow argument and require ACC_STATIC for <clinit> methods
122 #define JAVA_7_VERSION 51
123
124 // Extension method support.
125 #define JAVA_8_VERSION 52
126
127 #define JAVA_9_VERSION 53
128
129 #define JAVA_10_VERSION 54
130
131 #define JAVA_11_VERSION 55
132
133 #define JAVA_12_VERSION 56
134
135 #define JAVA_13_VERSION 57
136
137 #define JAVA_14_VERSION 58
138
139 #define JAVA_15_VERSION 59
140
141 #define JAVA_16_VERSION 60
142
143 #define JAVA_17_VERSION 61
144
145 #define JAVA_18_VERSION 62
146
147 #define JAVA_19_VERSION 63
148
149 #define JAVA_20_VERSION 64
150
151 #define JAVA_21_VERSION 65
152
153 #define JAVA_22_VERSION 66
154
155 #define JAVA_23_VERSION 67
156
157 #define CONSTANT_CLASS_DESCRIPTORS 69
158
159 #define JAVA_24_VERSION 68
160
161 #define JAVA_25_VERSION 69
162
163 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
164 assert((bad_constant == JVM_CONSTANT_Module ||
165 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
166 "Unexpected bad constant pool entry");
167 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
168 }
169
170 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
171 ConstantPool* cp,
172 const int length,
173 TRAPS) {
174 assert(stream != nullptr, "invariant");
175 assert(cp != nullptr, "invariant");
176
177 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
178 // this function (_current can be allocated in a register, with scalar
179 // replacement of aggregates). The _current pointer is copied back to
180 // stream() when this function returns. DON'T call another method within
181 // this method that uses stream().
182 const ClassFileStream cfs1 = *stream;
183 const ClassFileStream* const cfs = &cfs1;
184
185 debug_only(const u1* const old_current = stream->current();)
186
187 // Used for batching symbol allocations.
188 const char* names[SymbolTable::symbol_alloc_batch_size];
189 int lengths[SymbolTable::symbol_alloc_batch_size];
190 int indices[SymbolTable::symbol_alloc_batch_size];
191 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
192 int names_count = 0;
193
194 // parsing Index 0 is unused
195 for (int index = 1; index < length; index++) {
196 // Each of the following case guarantees one more byte in the stream
197 // for the following tag or the access_flags following constant pool,
198 // so we don't need bounds-check for reading tag.
199 const u1 tag = cfs->get_u1_fast();
200 switch (tag) {
201 case JVM_CONSTANT_Class: {
202 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
203 const u2 name_index = cfs->get_u2_fast();
204 cp->klass_index_at_put(index, name_index);
205 break;
206 }
207 case JVM_CONSTANT_Fieldref: {
208 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
209 const u2 class_index = cfs->get_u2_fast();
210 const u2 name_and_type_index = cfs->get_u2_fast();
211 cp->field_at_put(index, class_index, name_and_type_index);
212 break;
213 }
214 case JVM_CONSTANT_Methodref: {
215 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
216 const u2 class_index = cfs->get_u2_fast();
217 const u2 name_and_type_index = cfs->get_u2_fast();
218 cp->method_at_put(index, class_index, name_and_type_index);
219 break;
220 }
221 case JVM_CONSTANT_InterfaceMethodref: {
222 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
223 const u2 class_index = cfs->get_u2_fast();
224 const u2 name_and_type_index = cfs->get_u2_fast();
225 cp->interface_method_at_put(index, class_index, name_and_type_index);
226 break;
227 }
228 case JVM_CONSTANT_String : {
229 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
230 const u2 string_index = cfs->get_u2_fast();
231 cp->string_index_at_put(index, string_index);
232 break;
233 }
234 case JVM_CONSTANT_MethodHandle :
235 case JVM_CONSTANT_MethodType: {
236 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
237 classfile_parse_error(
238 "Class file version does not support constant tag %u in class file %s",
239 tag, THREAD);
240 return;
241 }
242 if (tag == JVM_CONSTANT_MethodHandle) {
243 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
244 const u1 ref_kind = cfs->get_u1_fast();
245 const u2 method_index = cfs->get_u2_fast();
246 cp->method_handle_index_at_put(index, ref_kind, method_index);
247 }
248 else if (tag == JVM_CONSTANT_MethodType) {
249 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
250 const u2 signature_index = cfs->get_u2_fast();
251 cp->method_type_index_at_put(index, signature_index);
252 }
253 else {
254 ShouldNotReachHere();
255 }
256 break;
257 }
258 case JVM_CONSTANT_Dynamic : {
259 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
260 classfile_parse_error(
261 "Class file version does not support constant tag %u in class file %s",
262 tag, THREAD);
263 return;
264 }
265 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
266 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
267 const u2 name_and_type_index = cfs->get_u2_fast();
268 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
269 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
270 }
271 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
272 break;
273 }
274 case JVM_CONSTANT_InvokeDynamic : {
275 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
276 classfile_parse_error(
277 "Class file version does not support constant tag %u in class file %s",
278 tag, THREAD);
279 return;
280 }
281 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
282 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
283 const u2 name_and_type_index = cfs->get_u2_fast();
284 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
285 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
286 }
287 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
288 break;
289 }
290 case JVM_CONSTANT_Integer: {
291 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
292 const u4 bytes = cfs->get_u4_fast();
293 cp->int_at_put(index, (jint)bytes);
294 break;
295 }
296 case JVM_CONSTANT_Float: {
297 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
298 const u4 bytes = cfs->get_u4_fast();
299 cp->float_at_put(index, *(jfloat*)&bytes);
300 break;
301 }
302 case JVM_CONSTANT_Long: {
303 // A mangled type might cause you to overrun allocated memory
304 guarantee_property(index + 1 < length,
305 "Invalid constant pool entry %u in class file %s",
306 index,
307 CHECK);
308 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
309 const u8 bytes = cfs->get_u8_fast();
310 cp->long_at_put(index, bytes);
311 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
312 break;
313 }
314 case JVM_CONSTANT_Double: {
315 // A mangled type might cause you to overrun allocated memory
316 guarantee_property(index+1 < length,
317 "Invalid constant pool entry %u in class file %s",
318 index,
319 CHECK);
320 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
321 const u8 bytes = cfs->get_u8_fast();
322 cp->double_at_put(index, *(jdouble*)&bytes);
323 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
324 break;
325 }
326 case JVM_CONSTANT_NameAndType: {
327 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
328 const u2 name_index = cfs->get_u2_fast();
329 const u2 signature_index = cfs->get_u2_fast();
330 cp->name_and_type_at_put(index, name_index, signature_index);
331 break;
332 }
333 case JVM_CONSTANT_Utf8 : {
334 cfs->guarantee_more(2, CHECK); // utf8_length
335 u2 utf8_length = cfs->get_u2_fast();
336 const u1* utf8_buffer = cfs->current();
337 assert(utf8_buffer != nullptr, "null utf8 buffer");
338 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
339 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
340 cfs->skip_u1_fast(utf8_length);
341
342 // Before storing the symbol, make sure it's legal
343 if (_need_verify) {
344 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
345 }
346
347 unsigned int hash;
348 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
349 utf8_length,
350 hash);
351 if (result == nullptr) {
352 names[names_count] = (const char*)utf8_buffer;
353 lengths[names_count] = utf8_length;
354 indices[names_count] = index;
355 hashValues[names_count++] = hash;
356 if (names_count == SymbolTable::symbol_alloc_batch_size) {
357 SymbolTable::new_symbols(_loader_data,
358 constantPoolHandle(THREAD, cp),
359 names_count,
360 names,
361 lengths,
362 indices,
363 hashValues);
364 names_count = 0;
365 }
366 } else {
367 cp->symbol_at_put(index, result);
368 }
369 break;
370 }
371 case JVM_CONSTANT_Module:
372 case JVM_CONSTANT_Package: {
373 // Record that an error occurred in these two cases but keep parsing so
374 // that ACC_Module can be checked for in the access_flags. Need to
375 // throw NoClassDefFoundError in that case.
376 if (_major_version >= JAVA_9_VERSION) {
377 cfs->guarantee_more(3, CHECK);
378 cfs->get_u2_fast();
379 set_class_bad_constant_seen(tag);
380 break;
381 }
382 }
383 default: {
384 classfile_parse_error("Unknown constant tag %u in class file %s",
385 tag,
386 THREAD);
387 return;
388 }
389 } // end of switch(tag)
390 } // end of for
391
392 // Allocate the remaining symbols
393 if (names_count > 0) {
394 SymbolTable::new_symbols(_loader_data,
395 constantPoolHandle(THREAD, cp),
396 names_count,
397 names,
398 lengths,
399 indices,
400 hashValues);
401 }
402
403 // Copy _current pointer of local copy back to stream.
404 assert(stream->current() == old_current, "non-exclusive use of stream");
405 stream->set_current(cfs1.current());
406
407 }
408
409 static inline bool valid_cp_range(int index, int length) {
410 return (index > 0 && index < length);
411 }
412
413 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
414 assert(cp != nullptr, "invariant");
415 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
416 return cp->symbol_at(index);
417 }
418 return nullptr;
419 }
420
421 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
422 ConstantPool* const cp,
423 const int length,
424 TRAPS) {
425 assert(cp != nullptr, "invariant");
426 assert(stream != nullptr, "invariant");
427
428 // parsing constant pool entries
429 parse_constant_pool_entries(stream, cp, length, CHECK);
430 if (class_bad_constant_seen() != 0) {
431 // a bad CP entry has been detected previously so stop parsing and just return.
432 return;
433 }
434
435 int index = 1; // declared outside of loops for portability
436 int num_klasses = 0;
437
438 // first verification pass - validate cross references
439 // and fixup class and string constants
440 for (index = 1; index < length; index++) { // Index 0 is unused
441 const jbyte tag = cp->tag_at(index).value();
442 switch (tag) {
443 case JVM_CONSTANT_Class: {
444 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
445 break;
446 }
447 case JVM_CONSTANT_Fieldref:
448 // fall through
449 case JVM_CONSTANT_Methodref:
450 // fall through
451 case JVM_CONSTANT_InterfaceMethodref: {
452 if (!_need_verify) break;
453 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
454 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
455 guarantee_property(valid_klass_reference_at(klass_ref_index),
456 "Invalid constant pool index %u in class file %s",
457 klass_ref_index, CHECK);
458 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
459 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
460 "Invalid constant pool index %u in class file %s",
461 name_and_type_ref_index, CHECK);
462 break;
463 }
464 case JVM_CONSTANT_String: {
465 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
466 break;
467 }
468 case JVM_CONSTANT_Integer:
469 break;
470 case JVM_CONSTANT_Float:
471 break;
472 case JVM_CONSTANT_Long:
473 case JVM_CONSTANT_Double: {
474 index++;
475 guarantee_property(
476 (index < length && cp->tag_at(index).is_invalid()),
477 "Improper constant pool long/double index %u in class file %s",
478 index, CHECK);
479 break;
480 }
481 case JVM_CONSTANT_NameAndType: {
482 if (!_need_verify) break;
483 const int name_ref_index = cp->name_ref_index_at(index);
484 const int signature_ref_index = cp->signature_ref_index_at(index);
485 guarantee_property(valid_symbol_at(name_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 name_ref_index, CHECK);
488 guarantee_property(valid_symbol_at(signature_ref_index),
489 "Invalid constant pool index %u in class file %s",
490 signature_ref_index, CHECK);
491 break;
492 }
493 case JVM_CONSTANT_Utf8:
494 break;
495 case JVM_CONSTANT_UnresolvedClass: // fall-through
496 case JVM_CONSTANT_UnresolvedClassInError: {
497 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
498 break;
499 }
500 case JVM_CONSTANT_ClassIndex: {
501 const int class_index = cp->klass_index_at(index);
502 guarantee_property(valid_symbol_at(class_index),
503 "Invalid constant pool index %u in class file %s",
504 class_index, CHECK);
505
506 Symbol* const name = cp->symbol_at(class_index);
507 const unsigned int name_len = name->utf8_length();
508 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
509 break;
510 }
511 case JVM_CONSTANT_StringIndex: {
512 const int string_index = cp->string_index_at(index);
513 guarantee_property(valid_symbol_at(string_index),
514 "Invalid constant pool index %u in class file %s",
515 string_index, CHECK);
516 Symbol* const sym = cp->symbol_at(string_index);
517 cp->unresolved_string_at_put(index, sym);
518 break;
519 }
520 case JVM_CONSTANT_MethodHandle: {
521 const int ref_index = cp->method_handle_index_at(index);
522 guarantee_property(valid_cp_range(ref_index, length),
523 "Invalid constant pool index %u in class file %s",
524 ref_index, CHECK);
525 const constantTag tag = cp->tag_at(ref_index);
526 const int ref_kind = cp->method_handle_ref_kind_at(index);
527
528 switch (ref_kind) {
529 case JVM_REF_getField:
530 case JVM_REF_getStatic:
531 case JVM_REF_putField:
532 case JVM_REF_putStatic: {
533 guarantee_property(
534 tag.is_field(),
535 "Invalid constant pool index %u in class file %s (not a field)",
536 ref_index, CHECK);
537 break;
538 }
539 case JVM_REF_invokeVirtual:
540 case JVM_REF_newInvokeSpecial: {
541 guarantee_property(
542 tag.is_method(),
543 "Invalid constant pool index %u in class file %s (not a method)",
544 ref_index, CHECK);
545 break;
546 }
547 case JVM_REF_invokeStatic:
548 case JVM_REF_invokeSpecial: {
549 guarantee_property(
550 tag.is_method() ||
551 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
552 "Invalid constant pool index %u in class file %s (not a method)",
553 ref_index, CHECK);
554 break;
555 }
556 case JVM_REF_invokeInterface: {
557 guarantee_property(
558 tag.is_interface_method(),
559 "Invalid constant pool index %u in class file %s (not an interface method)",
560 ref_index, CHECK);
561 break;
562 }
563 default: {
564 classfile_parse_error(
565 "Bad method handle kind at constant pool index %u in class file %s",
566 index, THREAD);
567 return;
568 }
569 } // switch(refkind)
570 // Keep the ref_index unchanged. It will be indirected at link-time.
571 break;
572 } // case MethodHandle
573 case JVM_CONSTANT_MethodType: {
574 const int ref_index = cp->method_type_index_at(index);
575 guarantee_property(valid_symbol_at(ref_index),
576 "Invalid constant pool index %u in class file %s",
577 ref_index, CHECK);
578 break;
579 }
580 case JVM_CONSTANT_Dynamic: {
581 const int name_and_type_ref_index =
582 cp->bootstrap_name_and_type_ref_index_at(index);
583
584 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
585 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
586 "Invalid constant pool index %u in class file %s",
587 name_and_type_ref_index, CHECK);
588 // bootstrap specifier index must be checked later,
589 // when BootstrapMethods attr is available
590
591 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
592 cp->set_has_dynamic_constant();
593 break;
594 }
595 case JVM_CONSTANT_InvokeDynamic: {
596 const int name_and_type_ref_index =
597 cp->bootstrap_name_and_type_ref_index_at(index);
598
599 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
600 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
601 "Invalid constant pool index %u in class file %s",
602 name_and_type_ref_index, CHECK);
603 // bootstrap specifier index must be checked later,
604 // when BootstrapMethods attr is available
605 break;
606 }
607 default: {
608 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
609 ShouldNotReachHere();
610 break;
611 }
612 } // switch(tag)
613 } // end of for
614
615 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
616
617 if (!_need_verify) {
618 return;
619 }
620
621 // second verification pass - checks the strings are of the right format.
622 // but not yet to the other entries
623 for (index = 1; index < length; index++) {
624 const jbyte tag = cp->tag_at(index).value();
625 switch (tag) {
626 case JVM_CONSTANT_UnresolvedClass: {
627 const Symbol* const class_name = cp->klass_name_at(index);
628 // check the name
629 verify_legal_class_name(class_name, CHECK);
630 break;
631 }
632 case JVM_CONSTANT_NameAndType: {
633 if (_need_verify) {
634 const int sig_index = cp->signature_ref_index_at(index);
635 const int name_index = cp->name_ref_index_at(index);
636 const Symbol* const name = cp->symbol_at(name_index);
637 const Symbol* const sig = cp->symbol_at(sig_index);
638 guarantee_property(sig->utf8_length() != 0,
639 "Illegal zero length constant pool entry at %d in class %s",
640 sig_index, CHECK);
641 guarantee_property(name->utf8_length() != 0,
642 "Illegal zero length constant pool entry at %d in class %s",
643 name_index, CHECK);
644
645 if (Signature::is_method(sig)) {
646 // Format check method name and signature
647 verify_legal_method_name(name, CHECK);
648 verify_legal_method_signature(name, sig, CHECK);
649 } else {
650 // Format check field name and signature
651 verify_legal_field_name(name, CHECK);
652 verify_legal_field_signature(name, sig, CHECK);
653 }
654 }
655 break;
656 }
657 case JVM_CONSTANT_Dynamic: {
658 const int name_and_type_ref_index =
659 cp->uncached_name_and_type_ref_index_at(index);
660 // already verified to be utf8
661 const int name_ref_index =
662 cp->name_ref_index_at(name_and_type_ref_index);
663 // already verified to be utf8
664 const int signature_ref_index =
665 cp->signature_ref_index_at(name_and_type_ref_index);
666 const Symbol* const name = cp->symbol_at(name_ref_index);
667 const Symbol* const signature = cp->symbol_at(signature_ref_index);
668 if (_need_verify) {
669 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
670 // Need only to be sure signature is the right type.
671 if (Signature::is_method(signature)) {
672 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
673 }
674 }
675 break;
676 }
677 case JVM_CONSTANT_InvokeDynamic:
678 case JVM_CONSTANT_Fieldref:
679 case JVM_CONSTANT_Methodref:
680 case JVM_CONSTANT_InterfaceMethodref: {
681 const int name_and_type_ref_index =
682 cp->uncached_name_and_type_ref_index_at(index);
683 // already verified to be utf8
684 const int name_ref_index =
685 cp->name_ref_index_at(name_and_type_ref_index);
686 // already verified to be utf8
687 const int signature_ref_index =
688 cp->signature_ref_index_at(name_and_type_ref_index);
689 const Symbol* const name = cp->symbol_at(name_ref_index);
690 const Symbol* const signature = cp->symbol_at(signature_ref_index);
691 if (tag == JVM_CONSTANT_Fieldref) {
692 if (_need_verify) {
693 // Field name and signature are verified above, when iterating NameAndType_info.
694 // Need only to be sure signature is non-zero length and the right type.
695 if (Signature::is_method(signature)) {
696 throwIllegalSignature("Field", name, signature, CHECK);
697 }
698 }
699 } else {
700 if (_need_verify) {
701 // Method name and signature are individually verified above, when iterating
702 // NameAndType_info. Need to check here that signature is non-zero length and
703 // the right type.
704 if (!Signature::is_method(signature)) {
705 throwIllegalSignature("Method", name, signature, CHECK);
706 }
707 }
708 // If a class method name begins with '<', it must be "<init>" and have void signature.
709 const unsigned int name_len = name->utf8_length();
710 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
711 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
712 if (name != vmSymbols::object_initializer_name()) {
713 classfile_parse_error(
714 "Bad method name at constant pool index %u in class file %s",
715 name_ref_index, THREAD);
716 return;
717 } else if (!Signature::is_void_method(signature)) { // must have void signature.
718 throwIllegalSignature("Method", name, signature, CHECK);
719 }
720 }
721 }
722 break;
723 }
724 case JVM_CONSTANT_MethodHandle: {
725 const int ref_index = cp->method_handle_index_at(index);
726 const int ref_kind = cp->method_handle_ref_kind_at(index);
727 switch (ref_kind) {
728 case JVM_REF_invokeVirtual:
729 case JVM_REF_invokeStatic:
730 case JVM_REF_invokeSpecial:
731 case JVM_REF_newInvokeSpecial: {
732 const int name_and_type_ref_index =
733 cp->uncached_name_and_type_ref_index_at(ref_index);
734 const int name_ref_index =
735 cp->name_ref_index_at(name_and_type_ref_index);
736 const Symbol* const name = cp->symbol_at(name_ref_index);
737
738 if (name != vmSymbols::object_initializer_name()) { // !<init>
739 if (ref_kind == JVM_REF_newInvokeSpecial) {
740 classfile_parse_error(
741 "Bad constructor name at constant pool index %u in class file %s",
742 name_ref_index, THREAD);
743 return;
744 }
745 } else { // <init>
746 // The allowed invocation mode of <init> depends on its signature.
747 // This test corresponds to verify_invoke_instructions in the verifier.
748 const int signature_ref_index =
749 cp->signature_ref_index_at(name_and_type_ref_index);
750 const Symbol* const signature = cp->symbol_at(signature_ref_index);
751 if (signature->is_void_method_signature()
752 && ref_kind == JVM_REF_newInvokeSpecial) {
753 // OK, could be a constructor call
754 } else {
755 classfile_parse_error(
756 "Bad method name at constant pool index %u in class file %s",
757 name_ref_index, THREAD);
758 return;
759 }
760 }
761 break;
762 }
763 // Other ref_kinds are already fully checked in previous pass.
764 } // switch(ref_kind)
765 break;
766 }
767 case JVM_CONSTANT_MethodType: {
768 const Symbol* const no_name = vmSymbols::type_name(); // place holder
769 const Symbol* const signature = cp->method_type_signature_at(index);
770 verify_legal_method_signature(no_name, signature, CHECK);
771 break;
772 }
773 case JVM_CONSTANT_Utf8: {
774 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
775 }
776 } // switch(tag)
777 } // end of for
778 }
779
780 class NameSigHash: public ResourceObj {
781 public:
782 const Symbol* _name; // name
783 const Symbol* _sig; // signature
784
785 static const int HASH_ROW_SIZE = 256;
786
787 NameSigHash(Symbol* name, Symbol* sig) :
788 _name(name),
789 _sig(sig) {}
790
791 static unsigned int hash(NameSigHash const& namesig) {
792 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
793 }
794
795 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
796 return (e0._name == e1._name) &&
797 (e0._sig == e1._sig);
798 }
799 };
800
801 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
802 NameSigHash::HASH_ROW_SIZE,
803 AnyObj::RESOURCE_AREA, mtInternal,
804 &NameSigHash::hash, &NameSigHash::equals>;
805
806 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
807 assert(super_type != nullptr,"Method doesn't support null super type");
808 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
809 && super_type->name() != vmSymbols::java_lang_Object()) {
810 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
811 err_msg("Value type %s has an identity type as supertype",
812 current->class_name()->as_klass_external_name()));
813 }
814 }
815
816 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
817 int itfs_len,
818 ConstantPool* cp,
819 bool* const has_nonstatic_concrete_methods,
820 // FIXME: lots of these functions
821 // declare their parameters as const,
822 // which adds only noise to the code.
823 // Remove the spurious const modifiers.
824 // Many are of the form "const int x"
825 // or "T* const x".
826 TRAPS) {
827 assert(stream != nullptr, "invariant");
828 assert(cp != nullptr, "invariant");
829 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
830
831 if (itfs_len == 0) {
832 _local_interfaces = Universe::the_empty_instance_klass_array();
833
834 } else {
835 assert(itfs_len > 0, "only called for len>0");
836 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
837 int index = 0;
838 for (index = 0; index < itfs_len; index++) {
839 const u2 interface_index = stream->get_u2(CHECK);
840 guarantee_property(
841 valid_klass_reference_at(interface_index),
842 "Interface name has bad constant pool index %u in class file %s",
843 interface_index, CHECK);
844 _local_interface_indexes->at_put_grow(index, interface_index);
845 }
846
847 if (!_need_verify || itfs_len <= 1) {
848 return;
849 }
850
851 // Check if there's any duplicates in interfaces
852 ResourceMark rm(THREAD);
853 // Set containing interface names
854 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
855 for (index = 0; index < itfs_len; index++) {
856 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
857 // If no duplicates, add (name, nullptr) in hashtable interface_names.
858 if (!interface_names->put(interface_name, 0)) {
859 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
860 interface_name->as_C_string(), THREAD);
861 return;
862 }
863 }
864 }
865 }
866
867 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
868 int constantvalue_index,
869 int signature_index,
870 TRAPS) const {
871 // Make sure the constant pool entry is of a type appropriate to this field
872 guarantee_property(
873 (constantvalue_index > 0 &&
874 constantvalue_index < cp->length()),
875 "Bad initial value index %u in ConstantValue attribute in class file %s",
876 constantvalue_index, CHECK);
877
878 const constantTag value_type = cp->tag_at(constantvalue_index);
879 switch(cp->basic_type_for_signature_at(signature_index)) {
880 case T_LONG: {
881 guarantee_property(value_type.is_long(),
882 "Inconsistent constant value type in class file %s",
883 CHECK);
884 break;
885 }
886 case T_FLOAT: {
887 guarantee_property(value_type.is_float(),
888 "Inconsistent constant value type in class file %s",
889 CHECK);
890 break;
891 }
892 case T_DOUBLE: {
893 guarantee_property(value_type.is_double(),
894 "Inconsistent constant value type in class file %s",
895 CHECK);
896 break;
897 }
898 case T_BYTE:
899 case T_CHAR:
900 case T_SHORT:
901 case T_BOOLEAN:
902 case T_INT: {
903 guarantee_property(value_type.is_int(),
904 "Inconsistent constant value type in class file %s",
905 CHECK);
906 break;
907 }
908 case T_OBJECT: {
909 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
910 && value_type.is_string()),
911 "Bad string initial value in class file %s",
912 CHECK);
913 break;
914 }
915 default: {
916 classfile_parse_error("Unable to set initial value %u in class file %s",
917 constantvalue_index,
918 THREAD);
919 }
920 }
921 }
922
923 class AnnotationCollector : public ResourceObj{
924 public:
925 enum Location { _in_field, _in_method, _in_class };
926 enum ID {
927 _unknown = 0,
928 _method_CallerSensitive,
929 _method_ForceInline,
930 _method_DontInline,
931 _method_ChangesCurrentThread,
932 _method_JvmtiHideEvents,
933 _method_JvmtiMountTransition,
934 _method_InjectedProfile,
935 _method_LambdaForm_Compiled,
936 _method_Hidden,
937 _method_Scoped,
938 _method_IntrinsicCandidate,
939 _jdk_internal_vm_annotation_Contended,
940 _field_Stable,
941 _jdk_internal_vm_annotation_ReservedStackAccess,
942 _jdk_internal_ValueBased,
943 _jdk_internal_ImplicitlyConstructible,
944 _jdk_internal_LooselyConsistentValue,
945 _jdk_internal_NullRestricted,
946 _java_lang_Deprecated,
947 _java_lang_Deprecated_for_removal,
948 _annotation_LIMIT
949 };
950 const Location _location;
951 int _annotations_present;
952 u2 _contended_group;
953
954 AnnotationCollector(Location location)
955 : _location(location), _annotations_present(0), _contended_group(0)
956 {
957 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
958 }
959 // If this annotation name has an ID, report it (or _none).
960 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
961 // Set the annotation name:
962 void set_annotation(ID id) {
963 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
964 _annotations_present |= (int)nth_bit((int)id);
965 }
966
967 void remove_annotation(ID id) {
968 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
969 _annotations_present &= (int)~nth_bit((int)id);
970 }
971
972 // Report if the annotation is present.
973 bool has_any_annotations() const { return _annotations_present != 0; }
974 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
975
976 void set_contended_group(u2 group) { _contended_group = group; }
977 u2 contended_group() const { return _contended_group; }
978
979 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
980
981 void set_stable(bool stable) { set_annotation(_field_Stable); }
982 bool is_stable() const { return has_annotation(_field_Stable); }
983 };
984
985 // This class also doubles as a holder for metadata cleanup.
986 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
987 private:
988 ClassLoaderData* _loader_data;
989 AnnotationArray* _field_annotations;
990 AnnotationArray* _field_type_annotations;
991 public:
992 FieldAnnotationCollector(ClassLoaderData* loader_data) :
993 AnnotationCollector(_in_field),
994 _loader_data(loader_data),
995 _field_annotations(nullptr),
996 _field_type_annotations(nullptr) {}
997 ~FieldAnnotationCollector();
998 void apply_to(FieldInfo* f);
999 AnnotationArray* field_annotations() { return _field_annotations; }
1000 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1001
1002 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1003 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1004 };
1005
1006 class MethodAnnotationCollector : public AnnotationCollector{
1007 public:
1008 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1009 void apply_to(const methodHandle& m);
1010 };
1011
1012 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1013 public:
1014 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1015 void apply_to(InstanceKlass* ik);
1016 };
1017
1018
1019 static int skip_annotation_value(const u1*, int, int); // fwd decl
1020
1021 // Safely increment index by val if does not pass limit
1022 #define SAFE_ADD(index, limit, val) \
1023 if (index >= limit - val) return limit; \
1024 index += val;
1025
1026 // Skip an annotation. Return >=limit if there is any problem.
1027 static int skip_annotation(const u1* buffer, int limit, int index) {
1028 assert(buffer != nullptr, "invariant");
1029 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1030 // value := switch (tag:u1) { ... }
1031 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1032 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1033 while (--nmem >= 0 && index < limit) {
1034 SAFE_ADD(index, limit, 2); // skip member
1035 index = skip_annotation_value(buffer, limit, index);
1036 }
1037 return index;
1038 }
1039
1040 // Skip an annotation value. Return >=limit if there is any problem.
1041 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1042 assert(buffer != nullptr, "invariant");
1043
1044 // value := switch (tag:u1) {
1045 // case B, C, I, S, Z, D, F, J, c: con:u2;
1046 // case e: e_class:u2 e_name:u2;
1047 // case s: s_con:u2;
1048 // case [: do(nval:u2) {value};
1049 // case @: annotation;
1050 // case s: s_con:u2;
1051 // }
1052 SAFE_ADD(index, limit, 1); // read tag
1053 const u1 tag = buffer[index - 1];
1054 switch (tag) {
1055 case 'B':
1056 case 'C':
1057 case 'I':
1058 case 'S':
1059 case 'Z':
1060 case 'D':
1061 case 'F':
1062 case 'J':
1063 case 'c':
1064 case 's':
1065 SAFE_ADD(index, limit, 2); // skip con or s_con
1066 break;
1067 case 'e':
1068 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1069 break;
1070 case '[':
1071 {
1072 SAFE_ADD(index, limit, 2); // read nval
1073 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1074 while (--nval >= 0 && index < limit) {
1075 index = skip_annotation_value(buffer, limit, index);
1076 }
1077 }
1078 break;
1079 case '@':
1080 index = skip_annotation(buffer, limit, index);
1081 break;
1082 default:
1083 return limit; // bad tag byte
1084 }
1085 return index;
1086 }
1087
1088 // Sift through annotations, looking for those significant to the VM:
1089 static void parse_annotations(const ConstantPool* const cp,
1090 const u1* buffer, int limit,
1091 AnnotationCollector* coll,
1092 ClassLoaderData* loader_data,
1093 const bool can_access_vm_annotations) {
1094
1095 assert(cp != nullptr, "invariant");
1096 assert(buffer != nullptr, "invariant");
1097 assert(coll != nullptr, "invariant");
1098 assert(loader_data != nullptr, "invariant");
1099
1100 // annotations := do(nann:u2) {annotation}
1101 int index = 2; // read nann
1102 if (index >= limit) return;
1103 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1104 enum { // initial annotation layout
1105 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1106 count_off = 2, // u2 such as 1 (one value)
1107 member_off = 4, // utf8 such as 'value'
1108 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1109 e_tag_val = 'e',
1110 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1111 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1112 e_size = 11, // end of 'e' annotation
1113 c_tag_val = 'c', // payload is type
1114 c_con_off = 7, // utf8 payload, such as 'I'
1115 c_size = 9, // end of 'c' annotation
1116 s_tag_val = 's', // payload is String
1117 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1118 s_size = 9,
1119 b_tag_val = 'Z', // payload is boolean
1120 min_size = 6 // smallest possible size (zero members)
1121 };
1122 // Cannot add min_size to index in case of overflow MAX_INT
1123 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1124 int index0 = index;
1125 index = skip_annotation(buffer, limit, index);
1126 const u1* const abase = buffer + index0;
1127 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1128 const int count = Bytes::get_Java_u2((address)abase + count_off);
1129 const Symbol* const aname = check_symbol_at(cp, atype);
1130 if (aname == nullptr) break; // invalid annotation name
1131 const Symbol* member = nullptr;
1132 if (count >= 1) {
1133 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1134 member = check_symbol_at(cp, member_index);
1135 if (member == nullptr) break; // invalid member name
1136 }
1137
1138 // Here is where parsing particular annotations will take place.
1139 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1140 if (AnnotationCollector::_unknown == id) continue;
1141 coll->set_annotation(id);
1142 if (AnnotationCollector::_java_lang_Deprecated == id) {
1143 // @Deprecated can specify forRemoval=true, which we need
1144 // to record for JFR to use. If the annotation is not well-formed
1145 // then we may not be able to determine that.
1146 const u1* offset = abase + member_off;
1147 // There are only 2 members in @Deprecated.
1148 int n_members = MIN2(count, 2);
1149 for (int i = 0; i < n_members; ++i) {
1150 int member_index = Bytes::get_Java_u2((address)offset);
1151 offset += 2;
1152 member = check_symbol_at(cp, member_index);
1153 if (member == vmSymbols::since() &&
1154 (*((address)offset) == s_tag_val)) {
1155 // Found `since` first so skip over it
1156 offset += 3;
1157 }
1158 else if (member == vmSymbols::for_removal() &&
1159 (*((address)offset) == b_tag_val)) {
1160 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1161 // No guarantee the entry is valid so check it refers to an int in the CP.
1162 if (cp->is_within_bounds(boolean_value_index) &&
1163 cp->tag_at(boolean_value_index).is_int() &&
1164 cp->int_at(boolean_value_index) == 1) {
1165 // forRemoval == true
1166 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1167 }
1168 break; // no need to check further
1169 }
1170 else {
1171 // This @Deprecated annotation is malformed so we don't try to
1172 // determine whether forRemoval is set.
1173 break;
1174 }
1175 }
1176 continue; // proceed to next annotation
1177 }
1178
1179 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1180 // @Contended can optionally specify the contention group.
1181 //
1182 // Contended group defines the equivalence class over the fields:
1183 // the fields within the same contended group are not treated distinct.
1184 // The only exception is default group, which does not incur the
1185 // equivalence. Naturally, contention group for classes is meaningless.
1186 //
1187 // While the contention group is specified as String, annotation
1188 // values are already interned, and we might as well use the constant
1189 // pool index as the group tag.
1190 //
1191 u2 group_index = 0; // default contended group
1192 if (count == 1
1193 && s_size == (index - index0) // match size
1194 && s_tag_val == *(abase + tag_off)
1195 && member == vmSymbols::value_name()) {
1196 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1197 // No guarantee the group_index is valid so check it refers to a
1198 // symbol in the CP.
1199 if (cp->is_within_bounds(group_index) &&
1200 cp->tag_at(group_index).is_utf8()) {
1201 // Seems valid, so check for empty string and reset
1202 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1203 group_index = 0; // default contended group
1204 }
1205 } else {
1206 // Not valid so use the default
1207 group_index = 0;
1208 }
1209 }
1210 coll->set_contended_group(group_index);
1211 continue; // proceed to next annotation
1212 }
1213 }
1214 }
1215
1216
1217 // Parse attributes for a field.
1218 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1219 u2 attributes_count,
1220 bool is_static, u2 signature_index,
1221 u2* const constantvalue_index_addr,
1222 bool* const is_synthetic_addr,
1223 u2* const generic_signature_index_addr,
1224 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1225 TRAPS) {
1226 assert(cfs != nullptr, "invariant");
1227 assert(constantvalue_index_addr != nullptr, "invariant");
1228 assert(is_synthetic_addr != nullptr, "invariant");
1229 assert(generic_signature_index_addr != nullptr, "invariant");
1230 assert(parsed_annotations != nullptr, "invariant");
1231 assert(attributes_count > 0, "attributes_count should be greater than 0");
1232
1233 u2 constantvalue_index = 0;
1234 u2 generic_signature_index = 0;
1235 bool is_synthetic = false;
1236 const u1* runtime_visible_annotations = nullptr;
1237 int runtime_visible_annotations_length = 0;
1238 const u1* runtime_visible_type_annotations = nullptr;
1239 int runtime_visible_type_annotations_length = 0;
1240 bool runtime_invisible_annotations_exists = false;
1241 bool runtime_invisible_type_annotations_exists = false;
1242 const ConstantPool* const cp = _cp;
1243
1244 while (attributes_count--) {
1245 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1246 const u2 attribute_name_index = cfs->get_u2_fast();
1247 const u4 attribute_length = cfs->get_u4_fast();
1248 guarantee_property(valid_symbol_at(attribute_name_index),
1249 "Invalid field attribute index %u in class file %s",
1250 attribute_name_index,
1251 CHECK);
1252
1253 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1254 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1255 // ignore if non-static
1256 if (constantvalue_index != 0) {
1257 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1258 return;
1259 }
1260 guarantee_property(
1261 attribute_length == 2,
1262 "Invalid ConstantValue field attribute length %u in class file %s",
1263 attribute_length, CHECK);
1264
1265 constantvalue_index = cfs->get_u2(CHECK);
1266 if (_need_verify) {
1267 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1268 }
1269 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1270 if (attribute_length != 0) {
1271 classfile_parse_error(
1272 "Invalid Synthetic field attribute length %u in class file %s",
1273 attribute_length, THREAD);
1274 return;
1275 }
1276 is_synthetic = true;
1277 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1278 if (attribute_length != 0) {
1279 classfile_parse_error(
1280 "Invalid Deprecated field attribute length %u in class file %s",
1281 attribute_length, THREAD);
1282 return;
1283 }
1284 } else if (_major_version >= JAVA_1_5_VERSION) {
1285 if (attribute_name == vmSymbols::tag_signature()) {
1286 if (generic_signature_index != 0) {
1287 classfile_parse_error(
1288 "Multiple Signature attributes for field in class file %s", THREAD);
1289 return;
1290 }
1291 if (attribute_length != 2) {
1292 classfile_parse_error(
1293 "Wrong size %u for field's Signature attribute in class file %s",
1294 attribute_length, THREAD);
1295 return;
1296 }
1297 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1298 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1299 if (runtime_visible_annotations != nullptr) {
1300 classfile_parse_error(
1301 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1302 return;
1303 }
1304 runtime_visible_annotations_length = attribute_length;
1305 runtime_visible_annotations = cfs->current();
1306 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1307 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1308 parse_annotations(cp,
1309 runtime_visible_annotations,
1310 runtime_visible_annotations_length,
1311 parsed_annotations,
1312 _loader_data,
1313 _can_access_vm_annotations);
1314 cfs->skip_u1_fast(runtime_visible_annotations_length);
1315 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1316 if (runtime_invisible_annotations_exists) {
1317 classfile_parse_error(
1318 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1319 return;
1320 }
1321 runtime_invisible_annotations_exists = true;
1322 cfs->skip_u1(attribute_length, CHECK);
1323 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1324 if (runtime_visible_type_annotations != nullptr) {
1325 classfile_parse_error(
1326 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1327 return;
1328 }
1329 runtime_visible_type_annotations_length = attribute_length;
1330 runtime_visible_type_annotations = cfs->current();
1331 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1332 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1333 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1334 if (runtime_invisible_type_annotations_exists) {
1335 classfile_parse_error(
1336 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1337 return;
1338 } else {
1339 runtime_invisible_type_annotations_exists = true;
1340 }
1341 cfs->skip_u1(attribute_length, CHECK);
1342 } else {
1343 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1344 }
1345 } else {
1346 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1347 }
1348 }
1349
1350 *constantvalue_index_addr = constantvalue_index;
1351 *is_synthetic_addr = is_synthetic;
1352 *generic_signature_index_addr = generic_signature_index;
1353 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1354 runtime_visible_annotations_length,
1355 CHECK);
1356 parsed_annotations->set_field_annotations(a);
1357 a = allocate_annotations(runtime_visible_type_annotations,
1358 runtime_visible_type_annotations_length,
1359 CHECK);
1360 parsed_annotations->set_field_type_annotations(a);
1361 return;
1362 }
1363
1364
1365 // Side-effects: populates the _fields, _fields_annotations,
1366 // _fields_type_annotations fields
1367 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1368 AccessFlags class_access_flags,
1369 ConstantPool* cp,
1370 const int cp_size,
1371 u2* const java_fields_count_ptr,
1372 TRAPS) {
1373
1374 assert(cfs != nullptr, "invariant");
1375 assert(cp != nullptr, "invariant");
1376 assert(java_fields_count_ptr != nullptr, "invariant");
1377
1378 assert(nullptr == _fields_annotations, "invariant");
1379 assert(nullptr == _fields_type_annotations, "invariant");
1380
1381 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1382 cfs->guarantee_more(2, CHECK); // length
1383 const u2 length = cfs->get_u2_fast();
1384 *java_fields_count_ptr = length;
1385
1386 int num_injected = 0;
1387 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1388 &num_injected);
1389
1390 // two more slots are required for inline classes:
1391 // one for the static field with a reference to the pre-allocated default value
1392 // one for the field the JVM injects when detecting an empty inline class
1393 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1394
1395 // Allocate a temporary resource array to collect field data.
1396 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1397 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1398
1399 int instance_fields_count = 0;
1400 ResourceMark rm(THREAD);
1401 for (int n = 0; n < length; n++) {
1402 // access_flags, name_index, descriptor_index, attributes_count
1403 cfs->guarantee_more(8, CHECK);
1404
1405 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1406 if (!supports_inline_types()) {
1407 recognized_modifiers &= ~JVM_ACC_STRICT;
1408 }
1409
1410 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1411 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1412 AccessFlags access_flags;
1413 access_flags.set_flags(flags);
1414 FieldInfo::FieldFlags fieldFlags(0);
1415
1416 const u2 name_index = cfs->get_u2_fast();
1417 guarantee_property(valid_symbol_at(name_index),
1418 "Invalid constant pool index %u for field name in class file %s",
1419 name_index, CHECK);
1420 const Symbol* const name = cp->symbol_at(name_index);
1421 verify_legal_field_name(name, CHECK);
1422
1423 const u2 signature_index = cfs->get_u2_fast();
1424 guarantee_property(valid_symbol_at(signature_index),
1425 "Invalid constant pool index %u for field signature in class file %s",
1426 signature_index, CHECK);
1427 const Symbol* const sig = cp->symbol_at(signature_index);
1428 verify_legal_field_signature(name, sig, CHECK);
1429 if (!access_flags.is_static()) instance_fields_count++;
1430
1431 u2 constantvalue_index = 0;
1432 bool is_synthetic = false;
1433 u2 generic_signature_index = 0;
1434 const bool is_static = access_flags.is_static();
1435 FieldAnnotationCollector parsed_annotations(_loader_data);
1436
1437 bool is_null_restricted = false;
1438
1439 const u2 attributes_count = cfs->get_u2_fast();
1440 if (attributes_count > 0) {
1441 parse_field_attributes(cfs,
1442 attributes_count,
1443 is_static,
1444 signature_index,
1445 &constantvalue_index,
1446 &is_synthetic,
1447 &generic_signature_index,
1448 &parsed_annotations,
1449 CHECK);
1450
1451 if (parsed_annotations.field_annotations() != nullptr) {
1452 if (_fields_annotations == nullptr) {
1453 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1454 _loader_data, length, nullptr,
1455 CHECK);
1456 }
1457 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1458 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1459 if (!Signature::has_envelope(sig)) {
1460 Exceptions::fthrow(
1461 THREAD_AND_LOCATION,
1462 vmSymbols::java_lang_ClassFormatError(),
1463 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s with signature %s (primitive types can never be null)",
1464 name->as_C_string(), sig->as_C_string());
1465 }
1466 is_null_restricted = true;
1467 }
1468 parsed_annotations.set_field_annotations(nullptr);
1469 }
1470 if (parsed_annotations.field_type_annotations() != nullptr) {
1471 if (_fields_type_annotations == nullptr) {
1472 _fields_type_annotations =
1473 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1474 length,
1475 nullptr,
1476 CHECK);
1477 }
1478 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1479 parsed_annotations.set_field_type_annotations(nullptr);
1480 }
1481
1482 if (is_synthetic) {
1483 access_flags.set_is_synthetic();
1484 }
1485 if (generic_signature_index != 0) {
1486 fieldFlags.update_generic(true);
1487 }
1488 }
1489
1490 if (is_null_restricted) {
1491 fieldFlags.update_null_free_inline_type(true);
1492 }
1493
1494 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1495
1496 // Update number of static oop fields.
1497 if (is_static && is_reference_type(type)) {
1498 _static_oop_count++;
1499 }
1500
1501 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1502 fi.set_index(n);
1503 if (fieldFlags.is_generic()) {
1504 fi.set_generic_signature_index(generic_signature_index);
1505 }
1506 parsed_annotations.apply_to(&fi);
1507 if (fi.field_flags().is_contended()) {
1508 _has_contended_fields = true;
1509 }
1510 _temp_field_info->append(fi);
1511 }
1512 assert(_temp_field_info->length() == length, "Must be");
1513
1514 if (num_injected != 0) {
1515 for (int n = 0; n < num_injected; n++) {
1516 // Check for duplicates
1517 if (injected[n].may_be_java) {
1518 const Symbol* const name = injected[n].name();
1519 const Symbol* const signature = injected[n].signature();
1520 bool duplicate = false;
1521 for (int i = 0; i < length; i++) {
1522 const FieldInfo* const f = _temp_field_info->adr_at(i);
1523 if (name == cp->symbol_at(f->name_index()) &&
1524 signature == cp->symbol_at(f->signature_index())) {
1525 // Symbol is desclared in Java so skip this one
1526 duplicate = true;
1527 break;
1528 }
1529 }
1530 if (duplicate) {
1531 // These will be removed from the field array at the end
1532 continue;
1533 }
1534 }
1535
1536 // Injected field
1537 FieldInfo::FieldFlags fflags(0);
1538 fflags.update_injected(true);
1539 AccessFlags aflags;
1540 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1541 int idx = _temp_field_info->append(fi);
1542 _temp_field_info->adr_at(idx)->set_index(idx);
1543 }
1544 }
1545
1546 if (is_inline_type) {
1547 // Inject static ".default" field
1548 FieldInfo::FieldFlags fflags(0);
1549 fflags.update_injected(true);
1550 AccessFlags aflags(JVM_ACC_STATIC);
1551 FieldInfo fi(aflags,
1552 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1553 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1554 0,
1555 fflags);
1556 int idx = _temp_field_info->append(fi);
1557 _temp_field_info->adr_at(idx)->set_index(idx);
1558 _static_oop_count++;
1559 // Inject static ".null_reset" field. This is the same as the .default field but will never have its null-channel set to non-zero.
1560 FieldInfo::FieldFlags fflags2(0);
1561 fflags2.update_injected(true);
1562 AccessFlags aflags2(JVM_ACC_STATIC);
1563 FieldInfo fi2(aflags2,
1564 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1565 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1566 0,
1567 fflags2);
1568 int idx2 = _temp_field_info->append(fi2);
1569 _temp_field_info->adr_at(idx2)->set_index(idx2);
1570 _static_oop_count++;
1571 }
1572
1573 if (_need_verify && length > 1) {
1574 // Check duplicated fields
1575 ResourceMark rm(THREAD);
1576 // Set containing name-signature pairs
1577 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1578 for (int i = 0; i < _temp_field_info->length(); i++) {
1579 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1580 _temp_field_info->adr_at(i)->signature(_cp));
1581 // If no duplicates, add name/signature in hashtable names_and_sigs.
1582 if(!names_and_sigs->put(name_and_sig, 0)) {
1583 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1584 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1585 return;
1586 }
1587 }
1588 }
1589 }
1590
1591
1592 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1593 u4 code_length,
1594 u4 exception_table_length,
1595 TRAPS) {
1596 assert(cfs != nullptr, "invariant");
1597
1598 const unsafe_u2* const exception_table_start = cfs->current();
1599 assert(exception_table_start != nullptr, "null exception table");
1600
1601 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1602 // end_pc,
1603 // handler_pc,
1604 // catch_type_index
1605
1606 // Will check legal target after parsing code array in verifier.
1607 if (_need_verify) {
1608 for (unsigned int i = 0; i < exception_table_length; i++) {
1609 const u2 start_pc = cfs->get_u2_fast();
1610 const u2 end_pc = cfs->get_u2_fast();
1611 const u2 handler_pc = cfs->get_u2_fast();
1612 const u2 catch_type_index = cfs->get_u2_fast();
1613 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1614 "Illegal exception table range in class file %s",
1615 CHECK_NULL);
1616 guarantee_property(handler_pc < code_length,
1617 "Illegal exception table handler in class file %s",
1618 CHECK_NULL);
1619 if (catch_type_index != 0) {
1620 guarantee_property(valid_klass_reference_at(catch_type_index),
1621 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1622 }
1623 }
1624 } else {
1625 cfs->skip_u2_fast(exception_table_length * 4);
1626 }
1627 return exception_table_start;
1628 }
1629
1630 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1631 u4 code_length,
1632 CompressedLineNumberWriteStream**const write_stream,
1633 TRAPS) {
1634
1635 const ClassFileStream* const cfs = _stream;
1636 unsigned int num_entries = cfs->get_u2(CHECK);
1637
1638 // Each entry is a u2 start_pc, and a u2 line_number
1639 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1640
1641 // Verify line number attribute and table length
1642 guarantee_property(
1643 code_attribute_length == sizeof(u2) + length_in_bytes,
1644 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1645
1646 cfs->guarantee_more(length_in_bytes, CHECK);
1647
1648 if ((*write_stream) == nullptr) {
1649 if (length_in_bytes > fixed_buffer_size) {
1650 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1651 } else {
1652 (*write_stream) = new CompressedLineNumberWriteStream(
1653 _linenumbertable_buffer, fixed_buffer_size);
1654 }
1655 }
1656
1657 while (num_entries-- > 0) {
1658 const u2 bci = cfs->get_u2_fast(); // start_pc
1659 const u2 line = cfs->get_u2_fast(); // line_number
1660 guarantee_property(bci < code_length,
1661 "Invalid pc in LineNumberTable in class file %s", CHECK);
1662 (*write_stream)->write_pair(bci, line);
1663 }
1664 }
1665
1666
1667 class LVT_Hash : public AllStatic {
1668 public:
1669
1670 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1671 /*
1672 * 3-tuple start_bci/length/slot has to be unique key,
1673 * so the following comparison seems to be redundant:
1674 * && elem->name_cp_index == entry->_elem->name_cp_index
1675 */
1676 return (e0.start_bci == e1.start_bci &&
1677 e0.length == e1.length &&
1678 e0.name_cp_index == e1.name_cp_index &&
1679 e0.slot == e1.slot);
1680 }
1681
1682 static unsigned int hash(LocalVariableTableElement const& e0) {
1683 unsigned int raw_hash = e0.start_bci;
1684
1685 raw_hash = e0.length + raw_hash * 37;
1686 raw_hash = e0.name_cp_index + raw_hash * 37;
1687 raw_hash = e0.slot + raw_hash * 37;
1688
1689 return raw_hash;
1690 }
1691 };
1692
1693
1694 // Class file LocalVariableTable elements.
1695 class Classfile_LVT_Element {
1696 public:
1697 u2 start_bci;
1698 u2 length;
1699 u2 name_cp_index;
1700 u2 descriptor_cp_index;
1701 u2 slot;
1702 };
1703
1704 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1705 LocalVariableTableElement* const lvt) {
1706 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1707 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1708 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1709 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1710 lvt->signature_cp_index = 0;
1711 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1712 }
1713
1714 // Function is used to parse both attributes:
1715 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1716 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1717 u4 code_length,
1718 u2 max_locals,
1719 u4 code_attribute_length,
1720 u2* const localvariable_table_length,
1721 bool isLVTT,
1722 TRAPS) {
1723 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1724 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1725 const unsigned int size = checked_cast<unsigned>(
1726 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1727
1728 const ConstantPool* const cp = _cp;
1729
1730 // Verify local variable table attribute has right length
1731 if (_need_verify) {
1732 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1733 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1734 }
1735
1736 const unsafe_u2* const localvariable_table_start = cfs->current();
1737 assert(localvariable_table_start != nullptr, "null local variable table");
1738 if (!_need_verify) {
1739 cfs->skip_u2_fast(size);
1740 } else {
1741 cfs->guarantee_more(size * 2, CHECK_NULL);
1742 for(int i = 0; i < (*localvariable_table_length); i++) {
1743 const u2 start_pc = cfs->get_u2_fast();
1744 const u2 length = cfs->get_u2_fast();
1745 const u2 name_index = cfs->get_u2_fast();
1746 const u2 descriptor_index = cfs->get_u2_fast();
1747 const u2 index = cfs->get_u2_fast();
1748 // Assign to a u4 to avoid overflow
1749 const u4 end_pc = (u4)start_pc + (u4)length;
1750
1751 if (start_pc >= code_length) {
1752 classfile_parse_error(
1753 "Invalid start_pc %u in %s in class file %s",
1754 start_pc, tbl_name, THREAD);
1755 return nullptr;
1756 }
1757 if (end_pc > code_length) {
1758 classfile_parse_error(
1759 "Invalid length %u in %s in class file %s",
1760 length, tbl_name, THREAD);
1761 return nullptr;
1762 }
1763 const int cp_size = cp->length();
1764 guarantee_property(valid_symbol_at(name_index),
1765 "Name index %u in %s has bad constant type in class file %s",
1766 name_index, tbl_name, CHECK_NULL);
1767 guarantee_property(valid_symbol_at(descriptor_index),
1768 "Signature index %u in %s has bad constant type in class file %s",
1769 descriptor_index, tbl_name, CHECK_NULL);
1770
1771 const Symbol* const name = cp->symbol_at(name_index);
1772 const Symbol* const sig = cp->symbol_at(descriptor_index);
1773 verify_legal_field_name(name, CHECK_NULL);
1774 u2 extra_slot = 0;
1775 if (!isLVTT) {
1776 verify_legal_field_signature(name, sig, CHECK_NULL);
1777
1778 // 4894874: check special cases for double and long local variables
1779 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1780 sig == vmSymbols::type_signature(T_LONG)) {
1781 extra_slot = 1;
1782 }
1783 }
1784 guarantee_property((index + extra_slot) < max_locals,
1785 "Invalid index %u in %s in class file %s",
1786 index, tbl_name, CHECK_NULL);
1787 }
1788 }
1789 return localvariable_table_start;
1790 }
1791
1792 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1793 u4 code_attribute_length,
1794 TRAPS) {
1795 assert(cfs != nullptr, "invariant");
1796
1797 if (0 == code_attribute_length) {
1798 return nullptr;
1799 }
1800
1801 const u1* const stackmap_table_start = cfs->current();
1802 assert(stackmap_table_start != nullptr, "null stackmap table");
1803
1804 // check code_attribute_length
1805 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1806
1807 return stackmap_table_start;
1808 }
1809
1810 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1811 u2* const checked_exceptions_length,
1812 u4 method_attribute_length,
1813 TRAPS) {
1814 assert(cfs != nullptr, "invariant");
1815 assert(checked_exceptions_length != nullptr, "invariant");
1816
1817 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1818 *checked_exceptions_length = cfs->get_u2_fast();
1819 const unsigned int size =
1820 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1821 const unsafe_u2* const checked_exceptions_start = cfs->current();
1822 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1823 if (!_need_verify) {
1824 cfs->skip_u2_fast(size);
1825 } else {
1826 // Verify each value in the checked exception table
1827 u2 checked_exception;
1828 const u2 len = *checked_exceptions_length;
1829 cfs->guarantee_more(2 * len, CHECK_NULL);
1830 for (int i = 0; i < len; i++) {
1831 checked_exception = cfs->get_u2_fast();
1832 guarantee_property(
1833 valid_klass_reference_at(checked_exception),
1834 "Exception name has bad type at constant pool %u in class file %s",
1835 checked_exception, CHECK_NULL);
1836 }
1837 }
1838 // check exceptions attribute length
1839 if (_need_verify) {
1840 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1841 sizeof(u2) * size),
1842 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1843 }
1844 return checked_exceptions_start;
1845 }
1846
1847 void ClassFileParser::throwIllegalSignature(const char* type,
1848 const Symbol* name,
1849 const Symbol* sig,
1850 TRAPS) const {
1851 assert(name != nullptr, "invariant");
1852 assert(sig != nullptr, "invariant");
1853
1854 ResourceMark rm(THREAD);
1855 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1856 Exceptions::fthrow(THREAD_AND_LOCATION,
1857 vmSymbols::java_lang_ClassFormatError(),
1858 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1859 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1860 }
1861
1862 AnnotationCollector::ID
1863 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1864 const Symbol* name,
1865 const bool can_access_vm_annotations) {
1866 const vmSymbolID sid = vmSymbols::find_sid(name);
1867 // Privileged code can use all annotations. Other code silently drops some.
1868 const bool privileged = loader_data->is_boot_class_loader_data() ||
1869 loader_data->is_platform_class_loader_data() ||
1870 can_access_vm_annotations;
1871 switch (sid) {
1872 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1873 if (_location != _in_method) break; // only allow for methods
1874 if (!privileged) break; // only allow in privileged code
1875 return _method_CallerSensitive;
1876 }
1877 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1878 if (_location != _in_method) break; // only allow for methods
1879 if (!privileged) break; // only allow in privileged code
1880 return _method_ForceInline;
1881 }
1882 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1883 if (_location != _in_method) break; // only allow for methods
1884 if (!privileged) break; // only allow in privileged code
1885 return _method_DontInline;
1886 }
1887 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1888 if (_location != _in_method) break; // only allow for methods
1889 if (!privileged) break; // only allow in privileged code
1890 return _method_ChangesCurrentThread;
1891 }
1892 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1893 if (_location != _in_method) break; // only allow for methods
1894 if (!privileged) break; // only allow in privileged code
1895 return _method_JvmtiHideEvents;
1896 }
1897 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1898 if (_location != _in_method) break; // only allow for methods
1899 if (!privileged) break; // only allow in privileged code
1900 return _method_JvmtiMountTransition;
1901 }
1902 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1903 if (_location != _in_method) break; // only allow for methods
1904 if (!privileged) break; // only allow in privileged code
1905 return _method_InjectedProfile;
1906 }
1907 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1908 if (_location != _in_method) break; // only allow for methods
1909 if (!privileged) break; // only allow in privileged code
1910 return _method_LambdaForm_Compiled;
1911 }
1912 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1913 if (_location != _in_method) break; // only allow for methods
1914 if (!privileged) break; // only allow in privileged code
1915 return _method_Hidden;
1916 }
1917 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1918 if (_location != _in_method) break; // only allow for methods
1919 if (!privileged) break; // only allow in privileged code
1920 return _method_Scoped;
1921 }
1922 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1923 if (_location != _in_method) break; // only allow for methods
1924 if (!privileged) break; // only allow in privileged code
1925 return _method_IntrinsicCandidate;
1926 }
1927 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1928 if (_location != _in_field) break; // only allow for fields
1929 if (!privileged) break; // only allow in privileged code
1930 return _field_Stable;
1931 }
1932 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1933 if (_location != _in_field && _location != _in_class) {
1934 break; // only allow for fields and classes
1935 }
1936 if (!EnableContended || (RestrictContended && !privileged)) {
1937 break; // honor privileges
1938 }
1939 return _jdk_internal_vm_annotation_Contended;
1940 }
1941 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1942 if (_location != _in_method) break; // only allow for methods
1943 if (RestrictReservedStack && !privileged) break; // honor privileges
1944 return _jdk_internal_vm_annotation_ReservedStackAccess;
1945 }
1946 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1947 if (_location != _in_class) break; // only allow for classes
1948 if (!privileged) break; // only allow in privileged code
1949 return _jdk_internal_ValueBased;
1950 }
1951 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ImplicitlyConstructible_signature): {
1952 if (_location != _in_class) break; // only allow for classes
1953 return _jdk_internal_ImplicitlyConstructible;
1954 }
1955 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1956 if (_location != _in_class) break; // only allow for classes
1957 return _jdk_internal_LooselyConsistentValue;
1958 }
1959 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1960 if (_location != _in_field) break; // only allow for fields
1961 return _jdk_internal_NullRestricted;
1962 }
1963 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1964 return _java_lang_Deprecated;
1965 }
1966 default: {
1967 break;
1968 }
1969 }
1970 return AnnotationCollector::_unknown;
1971 }
1972
1973 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1974 if (is_contended())
1975 // Setting the contended group also sets the contended bit in field flags
1976 f->set_contended_group(contended_group());
1977 if (is_stable())
1978 (f->field_flags_addr())->update_stable(true);
1979 }
1980
1981 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1982 // If there's an error deallocate metadata for field annotations
1983 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1984 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1985 }
1986
1987 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1988 if (has_annotation(_method_CallerSensitive))
1989 m->set_caller_sensitive();
1990 if (has_annotation(_method_ForceInline))
1991 m->set_force_inline();
1992 if (has_annotation(_method_DontInline))
1993 m->set_dont_inline();
1994 if (has_annotation(_method_ChangesCurrentThread))
1995 m->set_changes_current_thread();
1996 if (has_annotation(_method_JvmtiHideEvents))
1997 m->set_jvmti_hide_events();
1998 if (has_annotation(_method_JvmtiMountTransition))
1999 m->set_jvmti_mount_transition();
2000 if (has_annotation(_method_InjectedProfile))
2001 m->set_has_injected_profile();
2002 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2003 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2004 if (has_annotation(_method_Hidden))
2005 m->set_is_hidden();
2006 if (has_annotation(_method_Scoped))
2007 m->set_scoped();
2008 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2009 m->set_intrinsic_candidate();
2010 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2011 m->set_has_reserved_stack_access();
2012 if (has_annotation(_java_lang_Deprecated))
2013 m->set_deprecated();
2014 if (has_annotation(_java_lang_Deprecated_for_removal))
2015 m->set_deprecated_for_removal();
2016 }
2017
2018 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2019 assert(ik != nullptr, "invariant");
2020 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2021 ik->set_is_contended(is_contended());
2022 }
2023 if (has_annotation(_jdk_internal_ValueBased)) {
2024 ik->set_has_value_based_class_annotation();
2025 if (DiagnoseSyncOnValueBasedClasses) {
2026 ik->set_is_value_based();
2027 }
2028 }
2029 if (has_annotation(_java_lang_Deprecated)) {
2030 Array<Method*>* methods = ik->methods();
2031 int length = ik->methods()->length();
2032 for (int i = 0; i < length; i++) {
2033 Method* m = methods->at(i);
2034 m->set_deprecated();
2035 }
2036 }
2037 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2038 Array<Method*>* methods = ik->methods();
2039 int length = ik->methods()->length();
2040 for (int i = 0; i < length; i++) {
2041 Method* m = methods->at(i);
2042 m->set_deprecated_for_removal();
2043 }
2044 }
2045 }
2046
2047 #define MAX_ARGS_SIZE 255
2048 #define MAX_CODE_SIZE 65535
2049 #define INITIAL_MAX_LVT_NUMBER 256
2050
2051 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2052 *
2053 * Rules for LVT's and LVTT's are:
2054 * - There can be any number of LVT's and LVTT's.
2055 * - If there are n LVT's, it is the same as if there was just
2056 * one LVT containing all the entries from the n LVT's.
2057 * - There may be no more than one LVT entry per local variable.
2058 * Two LVT entries are 'equal' if these fields are the same:
2059 * start_pc, length, name, slot
2060 * - There may be no more than one LVTT entry per each LVT entry.
2061 * Each LVTT entry has to match some LVT entry.
2062 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2063 */
2064 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2065 int lvt_cnt,
2066 u2* const localvariable_table_length,
2067 const unsafe_u2** const localvariable_table_start,
2068 int lvtt_cnt,
2069 u2* const localvariable_type_table_length,
2070 const unsafe_u2** const localvariable_type_table_start,
2071 TRAPS) {
2072
2073 ResourceMark rm(THREAD);
2074
2075 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2076 256, AnyObj::RESOURCE_AREA, mtInternal,
2077 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2078
2079 LVT_HashTable* const table = new LVT_HashTable();
2080
2081 // To fill LocalVariableTable in
2082 const Classfile_LVT_Element* cf_lvt;
2083 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2084
2085 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2086 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2087 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2088 copy_lvt_element(&cf_lvt[idx], lvt);
2089 // If no duplicates, add LVT elem in hashtable.
2090 if (table->put(*lvt, lvt) == false
2091 && _need_verify
2092 && _major_version >= JAVA_1_5_VERSION) {
2093 classfile_parse_error("Duplicated LocalVariableTable attribute "
2094 "entry for '%s' in class file %s",
2095 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2096 THREAD);
2097 return;
2098 }
2099 }
2100 }
2101
2102 // To merge LocalVariableTable and LocalVariableTypeTable
2103 const Classfile_LVT_Element* cf_lvtt;
2104 LocalVariableTableElement lvtt_elem;
2105
2106 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2107 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2108 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2109 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2110 LocalVariableTableElement** entry = table->get(lvtt_elem);
2111 if (entry == nullptr) {
2112 if (_need_verify) {
2113 classfile_parse_error("LVTT entry for '%s' in class file %s "
2114 "does not match any LVT entry",
2115 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2116 THREAD);
2117 return;
2118 }
2119 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2120 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2121 "entry for '%s' in class file %s",
2122 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2123 THREAD);
2124 return;
2125 } else {
2126 // to add generic signatures into LocalVariableTable
2127 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2128 }
2129 }
2130 }
2131 }
2132
2133
2134 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2135 const u1* runtime_visible_annotations,
2136 int runtime_visible_annotations_length,
2137 const u1* runtime_visible_parameter_annotations,
2138 int runtime_visible_parameter_annotations_length,
2139 const u1* runtime_visible_type_annotations,
2140 int runtime_visible_type_annotations_length,
2141 const u1* annotation_default,
2142 int annotation_default_length,
2143 TRAPS) {
2144
2145 AnnotationArray* a;
2146
2147 if (runtime_visible_annotations_length > 0) {
2148 a = allocate_annotations(runtime_visible_annotations,
2149 runtime_visible_annotations_length,
2150 CHECK);
2151 cm->set_method_annotations(a);
2152 }
2153
2154 if (runtime_visible_parameter_annotations_length > 0) {
2155 a = allocate_annotations(runtime_visible_parameter_annotations,
2156 runtime_visible_parameter_annotations_length,
2157 CHECK);
2158 cm->set_parameter_annotations(a);
2159 }
2160
2161 if (annotation_default_length > 0) {
2162 a = allocate_annotations(annotation_default,
2163 annotation_default_length,
2164 CHECK);
2165 cm->set_default_annotations(a);
2166 }
2167
2168 if (runtime_visible_type_annotations_length > 0) {
2169 a = allocate_annotations(runtime_visible_type_annotations,
2170 runtime_visible_type_annotations_length,
2171 CHECK);
2172 cm->set_type_annotations(a);
2173 }
2174 }
2175
2176
2177 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2178 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2179 // Method* to save footprint, so we only know the size of the resulting Method* when the
2180 // entire method attribute is parsed.
2181 //
2182 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2183
2184 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2185 bool is_interface,
2186 bool is_value_class,
2187 bool is_abstract_class,
2188 const ConstantPool* cp,
2189 bool* const has_localvariable_table,
2190 TRAPS) {
2191 assert(cfs != nullptr, "invariant");
2192 assert(cp != nullptr, "invariant");
2193 assert(has_localvariable_table != nullptr, "invariant");
2194
2195 ResourceMark rm(THREAD);
2196 // Parse fixed parts:
2197 // access_flags, name_index, descriptor_index, attributes_count
2198 cfs->guarantee_more(8, CHECK_NULL);
2199
2200 u2 flags = cfs->get_u2_fast();
2201 const u2 name_index = cfs->get_u2_fast();
2202 const int cp_size = cp->length();
2203 guarantee_property(
2204 valid_symbol_at(name_index),
2205 "Illegal constant pool index %u for method name in class file %s",
2206 name_index, CHECK_NULL);
2207 const Symbol* const name = cp->symbol_at(name_index);
2208 verify_legal_method_name(name, CHECK_NULL);
2209
2210 const u2 signature_index = cfs->get_u2_fast();
2211 guarantee_property(
2212 valid_symbol_at(signature_index),
2213 "Illegal constant pool index %u for method signature in class file %s",
2214 signature_index, CHECK_NULL);
2215 const Symbol* const signature = cp->symbol_at(signature_index);
2216
2217 if (name == vmSymbols::class_initializer_name()) {
2218 // We ignore the other access flags for a valid class initializer.
2219 // (JVM Spec 2nd ed., chapter 4.6)
2220 if (_major_version < 51) { // backward compatibility
2221 flags = JVM_ACC_STATIC;
2222 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2223 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2224 } else {
2225 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2226 return nullptr;
2227 }
2228 } else {
2229 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2230 }
2231
2232 if (name == vmSymbols::object_initializer_name() && is_interface) {
2233 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2234 return nullptr;
2235 }
2236
2237 if (EnableValhalla) {
2238 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2239 && ((flags & JVM_ACC_STATIC) == 0 )
2240 && !_access_flags.is_identity_class()) {
2241 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2242 return nullptr;
2243 }
2244 }
2245
2246 int args_size = -1; // only used when _need_verify is true
2247 if (_need_verify) {
2248 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2249 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2250 verify_legal_method_signature(name, signature, CHECK_NULL);
2251 if (args_size > MAX_ARGS_SIZE) {
2252 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2253 return nullptr;
2254 }
2255 }
2256
2257 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2258
2259 // Default values for code and exceptions attribute elements
2260 u2 max_stack = 0;
2261 u2 max_locals = 0;
2262 u4 code_length = 0;
2263 const u1* code_start = nullptr;
2264 u2 exception_table_length = 0;
2265 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2266 Array<int>* exception_handlers = Universe::the_empty_int_array();
2267 u2 checked_exceptions_length = 0;
2268 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2269 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2270 int linenumber_table_length = 0;
2271 int total_lvt_length = 0;
2272 u2 lvt_cnt = 0;
2273 u2 lvtt_cnt = 0;
2274 bool lvt_allocated = false;
2275 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2276 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2277 u2* localvariable_table_length = nullptr;
2278 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2279 u2* localvariable_type_table_length = nullptr;
2280 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2281 int method_parameters_length = -1;
2282 const u1* method_parameters_data = nullptr;
2283 bool method_parameters_seen = false;
2284 bool parsed_code_attribute = false;
2285 bool parsed_checked_exceptions_attribute = false;
2286 bool parsed_stackmap_attribute = false;
2287 // stackmap attribute - JDK1.5
2288 const u1* stackmap_data = nullptr;
2289 int stackmap_data_length = 0;
2290 u2 generic_signature_index = 0;
2291 MethodAnnotationCollector parsed_annotations;
2292 const u1* runtime_visible_annotations = nullptr;
2293 int runtime_visible_annotations_length = 0;
2294 const u1* runtime_visible_parameter_annotations = nullptr;
2295 int runtime_visible_parameter_annotations_length = 0;
2296 const u1* runtime_visible_type_annotations = nullptr;
2297 int runtime_visible_type_annotations_length = 0;
2298 bool runtime_invisible_annotations_exists = false;
2299 bool runtime_invisible_type_annotations_exists = false;
2300 bool runtime_invisible_parameter_annotations_exists = false;
2301 const u1* annotation_default = nullptr;
2302 int annotation_default_length = 0;
2303
2304 // Parse code and exceptions attribute
2305 u2 method_attributes_count = cfs->get_u2_fast();
2306 while (method_attributes_count--) {
2307 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2308 const u2 method_attribute_name_index = cfs->get_u2_fast();
2309 const u4 method_attribute_length = cfs->get_u4_fast();
2310 guarantee_property(
2311 valid_symbol_at(method_attribute_name_index),
2312 "Invalid method attribute name index %u in class file %s",
2313 method_attribute_name_index, CHECK_NULL);
2314
2315 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2316 if (method_attribute_name == vmSymbols::tag_code()) {
2317 // Parse Code attribute
2318 if (_need_verify) {
2319 guarantee_property(
2320 !access_flags.is_native() && !access_flags.is_abstract(),
2321 "Code attribute in native or abstract methods in class file %s",
2322 CHECK_NULL);
2323 }
2324 if (parsed_code_attribute) {
2325 classfile_parse_error("Multiple Code attributes in class file %s",
2326 THREAD);
2327 return nullptr;
2328 }
2329 parsed_code_attribute = true;
2330
2331 // Stack size, locals size, and code size
2332 cfs->guarantee_more(8, CHECK_NULL);
2333 max_stack = cfs->get_u2_fast();
2334 max_locals = cfs->get_u2_fast();
2335 code_length = cfs->get_u4_fast();
2336 if (_need_verify) {
2337 guarantee_property(args_size <= max_locals,
2338 "Arguments can't fit into locals in class file %s",
2339 CHECK_NULL);
2340 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2341 "Invalid method Code length %u in class file %s",
2342 code_length, CHECK_NULL);
2343 }
2344 // Code pointer
2345 code_start = cfs->current();
2346 assert(code_start != nullptr, "null code start");
2347 cfs->guarantee_more(code_length, CHECK_NULL);
2348 cfs->skip_u1_fast(code_length);
2349
2350 // Exception handler table
2351 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2352 exception_table_length = cfs->get_u2_fast();
2353 if (exception_table_length > 0) {
2354 exception_table_start = parse_exception_table(cfs,
2355 code_length,
2356 exception_table_length,
2357 CHECK_NULL);
2358 }
2359
2360 // Parse additional attributes in code attribute
2361 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2362 u2 code_attributes_count = cfs->get_u2_fast();
2363
2364 unsigned int calculated_attribute_length = 0;
2365
2366 calculated_attribute_length =
2367 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2368 calculated_attribute_length += checked_cast<unsigned int>(
2369 code_length +
2370 sizeof(exception_table_length) +
2371 sizeof(code_attributes_count) +
2372 exception_table_length *
2373 ( sizeof(u2) + // start_pc
2374 sizeof(u2) + // end_pc
2375 sizeof(u2) + // handler_pc
2376 sizeof(u2) )); // catch_type_index
2377
2378 while (code_attributes_count--) {
2379 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2380 const u2 code_attribute_name_index = cfs->get_u2_fast();
2381 const u4 code_attribute_length = cfs->get_u4_fast();
2382 calculated_attribute_length += code_attribute_length +
2383 (unsigned)sizeof(code_attribute_name_index) +
2384 (unsigned)sizeof(code_attribute_length);
2385 guarantee_property(valid_symbol_at(code_attribute_name_index),
2386 "Invalid code attribute name index %u in class file %s",
2387 code_attribute_name_index,
2388 CHECK_NULL);
2389 if (LoadLineNumberTables &&
2390 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2391 // Parse and compress line number table
2392 parse_linenumber_table(code_attribute_length,
2393 code_length,
2394 &linenumber_table,
2395 CHECK_NULL);
2396
2397 } else if (LoadLocalVariableTables &&
2398 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2399 // Parse local variable table
2400 if (!lvt_allocated) {
2401 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2402 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2403 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2404 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2405 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2406 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2407 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2408 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2409 lvt_allocated = true;
2410 }
2411 if (lvt_cnt == max_lvt_cnt) {
2412 max_lvt_cnt <<= 1;
2413 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2414 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2415 }
2416 localvariable_table_start[lvt_cnt] =
2417 parse_localvariable_table(cfs,
2418 code_length,
2419 max_locals,
2420 code_attribute_length,
2421 &localvariable_table_length[lvt_cnt],
2422 false, // is not LVTT
2423 CHECK_NULL);
2424 total_lvt_length += localvariable_table_length[lvt_cnt];
2425 lvt_cnt++;
2426 } else if (LoadLocalVariableTypeTables &&
2427 _major_version >= JAVA_1_5_VERSION &&
2428 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2429 if (!lvt_allocated) {
2430 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2431 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2432 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2433 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2434 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2435 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2436 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2437 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2438 lvt_allocated = true;
2439 }
2440 // Parse local variable type table
2441 if (lvtt_cnt == max_lvtt_cnt) {
2442 max_lvtt_cnt <<= 1;
2443 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2444 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2445 }
2446 localvariable_type_table_start[lvtt_cnt] =
2447 parse_localvariable_table(cfs,
2448 code_length,
2449 max_locals,
2450 code_attribute_length,
2451 &localvariable_type_table_length[lvtt_cnt],
2452 true, // is LVTT
2453 CHECK_NULL);
2454 lvtt_cnt++;
2455 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2456 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2457 // Stack map is only needed by the new verifier in JDK1.5.
2458 if (parsed_stackmap_attribute) {
2459 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2460 return nullptr;
2461 }
2462 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2463 stackmap_data_length = code_attribute_length;
2464 parsed_stackmap_attribute = true;
2465 } else {
2466 // Skip unknown attributes
2467 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2468 }
2469 }
2470 // check method attribute length
2471 if (_need_verify) {
2472 guarantee_property(method_attribute_length == calculated_attribute_length,
2473 "Code segment has wrong length in class file %s",
2474 CHECK_NULL);
2475 }
2476 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2477 // Parse Exceptions attribute
2478 if (parsed_checked_exceptions_attribute) {
2479 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2480 THREAD);
2481 return nullptr;
2482 }
2483 parsed_checked_exceptions_attribute = true;
2484 checked_exceptions_start =
2485 parse_checked_exceptions(cfs,
2486 &checked_exceptions_length,
2487 method_attribute_length,
2488 CHECK_NULL);
2489 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2490 // reject multiple method parameters
2491 if (method_parameters_seen) {
2492 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2493 THREAD);
2494 return nullptr;
2495 }
2496 method_parameters_seen = true;
2497 method_parameters_length = cfs->get_u1_fast();
2498 const u4 real_length = (method_parameters_length * 4u) + 1u;
2499 if (method_attribute_length != real_length) {
2500 classfile_parse_error(
2501 "Invalid MethodParameters method attribute length %u in class file",
2502 method_attribute_length, THREAD);
2503 return nullptr;
2504 }
2505 method_parameters_data = cfs->current();
2506 cfs->skip_u2_fast(method_parameters_length);
2507 cfs->skip_u2_fast(method_parameters_length);
2508 // ignore this attribute if it cannot be reflected
2509 if (!vmClasses::Parameter_klass_loaded())
2510 method_parameters_length = -1;
2511 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2512 if (method_attribute_length != 0) {
2513 classfile_parse_error(
2514 "Invalid Synthetic method attribute length %u in class file %s",
2515 method_attribute_length, THREAD);
2516 return nullptr;
2517 }
2518 // Should we check that there hasn't already been a synthetic attribute?
2519 access_flags.set_is_synthetic();
2520 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2521 if (method_attribute_length != 0) {
2522 classfile_parse_error(
2523 "Invalid Deprecated method attribute length %u in class file %s",
2524 method_attribute_length, THREAD);
2525 return nullptr;
2526 }
2527 } else if (_major_version >= JAVA_1_5_VERSION) {
2528 if (method_attribute_name == vmSymbols::tag_signature()) {
2529 if (generic_signature_index != 0) {
2530 classfile_parse_error(
2531 "Multiple Signature attributes for method in class file %s",
2532 THREAD);
2533 return nullptr;
2534 }
2535 if (method_attribute_length != 2) {
2536 classfile_parse_error(
2537 "Invalid Signature attribute length %u in class file %s",
2538 method_attribute_length, THREAD);
2539 return nullptr;
2540 }
2541 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2542 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2543 if (runtime_visible_annotations != nullptr) {
2544 classfile_parse_error(
2545 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2546 THREAD);
2547 return nullptr;
2548 }
2549 runtime_visible_annotations_length = method_attribute_length;
2550 runtime_visible_annotations = cfs->current();
2551 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2552 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2553 parse_annotations(cp,
2554 runtime_visible_annotations,
2555 runtime_visible_annotations_length,
2556 &parsed_annotations,
2557 _loader_data,
2558 _can_access_vm_annotations);
2559 cfs->skip_u1_fast(runtime_visible_annotations_length);
2560 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2561 if (runtime_invisible_annotations_exists) {
2562 classfile_parse_error(
2563 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2564 THREAD);
2565 return nullptr;
2566 }
2567 runtime_invisible_annotations_exists = true;
2568 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2569 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2570 if (runtime_visible_parameter_annotations != nullptr) {
2571 classfile_parse_error(
2572 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2573 THREAD);
2574 return nullptr;
2575 }
2576 runtime_visible_parameter_annotations_length = method_attribute_length;
2577 runtime_visible_parameter_annotations = cfs->current();
2578 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2579 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2580 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2581 if (runtime_invisible_parameter_annotations_exists) {
2582 classfile_parse_error(
2583 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2584 THREAD);
2585 return nullptr;
2586 }
2587 runtime_invisible_parameter_annotations_exists = true;
2588 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2589 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2590 if (annotation_default != nullptr) {
2591 classfile_parse_error(
2592 "Multiple AnnotationDefault attributes for method in class file %s",
2593 THREAD);
2594 return nullptr;
2595 }
2596 annotation_default_length = method_attribute_length;
2597 annotation_default = cfs->current();
2598 assert(annotation_default != nullptr, "null annotation default");
2599 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2600 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2601 if (runtime_visible_type_annotations != nullptr) {
2602 classfile_parse_error(
2603 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2604 THREAD);
2605 return nullptr;
2606 }
2607 runtime_visible_type_annotations_length = method_attribute_length;
2608 runtime_visible_type_annotations = cfs->current();
2609 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2610 // No need for the VM to parse Type annotations
2611 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2612 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2613 if (runtime_invisible_type_annotations_exists) {
2614 classfile_parse_error(
2615 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2616 THREAD);
2617 return nullptr;
2618 }
2619 runtime_invisible_type_annotations_exists = true;
2620 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2621 } else {
2622 // Skip unknown attributes
2623 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2624 }
2625 } else {
2626 // Skip unknown attributes
2627 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2628 }
2629 }
2630
2631 if (linenumber_table != nullptr) {
2632 linenumber_table->write_terminator();
2633 linenumber_table_length = linenumber_table->position();
2634 }
2635
2636 // Make sure there's at least one Code attribute in non-native/non-abstract method
2637 if (_need_verify) {
2638 guarantee_property(access_flags.is_native() ||
2639 access_flags.is_abstract() ||
2640 parsed_code_attribute,
2641 "Absent Code attribute in method that is not native or abstract in class file %s",
2642 CHECK_NULL);
2643 }
2644
2645 // All sizing information for a Method* is finally available, now create it
2646 InlineTableSizes sizes(
2647 total_lvt_length,
2648 linenumber_table_length,
2649 exception_table_length,
2650 checked_exceptions_length,
2651 method_parameters_length,
2652 generic_signature_index,
2653 runtime_visible_annotations_length,
2654 runtime_visible_parameter_annotations_length,
2655 runtime_visible_type_annotations_length,
2656 annotation_default_length,
2657 0);
2658
2659 Method* const m = Method::allocate(_loader_data,
2660 code_length,
2661 access_flags,
2662 &sizes,
2663 ConstMethod::NORMAL,
2664 _cp->symbol_at(name_index),
2665 CHECK_NULL);
2666
2667 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2668
2669 // Fill in information from fixed part (access_flags already set)
2670 m->set_constants(_cp);
2671 m->set_name_index(name_index);
2672 m->set_signature_index(signature_index);
2673 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2674 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2675
2676 // Fill in code attribute information
2677 m->set_max_stack(max_stack);
2678 m->set_max_locals(max_locals);
2679 if (stackmap_data != nullptr) {
2680 m->constMethod()->copy_stackmap_data(_loader_data,
2681 (u1*)stackmap_data,
2682 stackmap_data_length,
2683 CHECK_NULL);
2684 }
2685
2686 // Copy byte codes
2687 m->set_code((u1*)code_start);
2688
2689 // Copy line number table
2690 if (linenumber_table != nullptr) {
2691 memcpy(m->compressed_linenumber_table(),
2692 linenumber_table->buffer(),
2693 linenumber_table_length);
2694 }
2695
2696 // Copy exception table
2697 if (exception_table_length > 0) {
2698 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2699 m->exception_table_start(),
2700 exception_table_length * sizeof(ExceptionTableElement),
2701 sizeof(u2));
2702 }
2703
2704 // Copy method parameters
2705 if (method_parameters_length > 0) {
2706 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2707 for (int i = 0; i < method_parameters_length; i++) {
2708 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2709 method_parameters_data += 2;
2710 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2711 method_parameters_data += 2;
2712 }
2713 }
2714
2715 // Copy checked exceptions
2716 if (checked_exceptions_length > 0) {
2717 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2718 m->checked_exceptions_start(),
2719 checked_exceptions_length * sizeof(CheckedExceptionElement),
2720 sizeof(u2));
2721 }
2722
2723 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2724 if (total_lvt_length > 0) {
2725 *has_localvariable_table = true;
2726 copy_localvariable_table(m->constMethod(),
2727 lvt_cnt,
2728 localvariable_table_length,
2729 localvariable_table_start,
2730 lvtt_cnt,
2731 localvariable_type_table_length,
2732 localvariable_type_table_start,
2733 CHECK_NULL);
2734 }
2735
2736 if (parsed_annotations.has_any_annotations())
2737 parsed_annotations.apply_to(methodHandle(THREAD, m));
2738
2739 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2740 m->set_is_hidden();
2741 }
2742
2743 // Copy annotations
2744 copy_method_annotations(m->constMethod(),
2745 runtime_visible_annotations,
2746 runtime_visible_annotations_length,
2747 runtime_visible_parameter_annotations,
2748 runtime_visible_parameter_annotations_length,
2749 runtime_visible_type_annotations,
2750 runtime_visible_type_annotations_length,
2751 annotation_default,
2752 annotation_default_length,
2753 CHECK_NULL);
2754
2755 if (InstanceKlass::is_finalization_enabled() &&
2756 name == vmSymbols::finalize_method_name() &&
2757 signature == vmSymbols::void_method_signature()) {
2758 if (m->is_empty_method()) {
2759 _has_empty_finalizer = true;
2760 } else {
2761 _has_finalizer = true;
2762 }
2763 }
2764
2765 NOT_PRODUCT(m->verify());
2766 return m;
2767 }
2768
2769
2770 // Side-effects: populates the _methods field in the parser
2771 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2772 bool is_interface,
2773 bool is_value_class,
2774 bool is_abstract_type,
2775 bool* const has_localvariable_table,
2776 bool* has_final_method,
2777 bool* declares_nonstatic_concrete_methods,
2778 TRAPS) {
2779 assert(cfs != nullptr, "invariant");
2780 assert(has_localvariable_table != nullptr, "invariant");
2781 assert(has_final_method != nullptr, "invariant");
2782 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2783
2784 assert(nullptr == _methods, "invariant");
2785
2786 cfs->guarantee_more(2, CHECK); // length
2787 const u2 length = cfs->get_u2_fast();
2788 if (length == 0) {
2789 _methods = Universe::the_empty_method_array();
2790 } else {
2791 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2792 length,
2793 nullptr,
2794 CHECK);
2795
2796 for (int index = 0; index < length; index++) {
2797 Method* method = parse_method(cfs,
2798 is_interface,
2799 is_value_class,
2800 is_abstract_type,
2801 _cp,
2802 has_localvariable_table,
2803 CHECK);
2804
2805 if (method->is_final()) {
2806 *has_final_method = true;
2807 }
2808 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2809 // used for interface initialization, and default method inheritance analysis
2810 if (is_interface && !(*declares_nonstatic_concrete_methods)
2811 && !method->is_abstract() && !method->is_static()) {
2812 *declares_nonstatic_concrete_methods = true;
2813 }
2814 _methods->at_put(index, method);
2815 }
2816
2817 if (_need_verify && length > 1) {
2818 // Check duplicated methods
2819 ResourceMark rm(THREAD);
2820 // Set containing name-signature pairs
2821 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2822 for (int i = 0; i < length; i++) {
2823 const Method* const m = _methods->at(i);
2824 NameSigHash name_and_sig(m->name(), m->signature());
2825 // If no duplicates, add name/signature in hashtable names_and_sigs.
2826 if(!names_and_sigs->put(name_and_sig, 0)) {
2827 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2828 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2829 return;
2830 }
2831 }
2832 }
2833 }
2834 }
2835
2836 static const intArray* sort_methods(Array<Method*>* methods) {
2837 const int length = methods->length();
2838 // If JVMTI original method ordering or sharing is enabled we have to
2839 // remember the original class file ordering.
2840 // We temporarily use the vtable_index field in the Method* to store the
2841 // class file index, so we can read in after calling qsort.
2842 // Put the method ordering in the shared archive.
2843 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2844 for (int index = 0; index < length; index++) {
2845 Method* const m = methods->at(index);
2846 assert(!m->valid_vtable_index(), "vtable index should not be set");
2847 m->set_vtable_index(index);
2848 }
2849 }
2850 // Sort method array by ascending method name (for faster lookups & vtable construction)
2851 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2852 Method::sort_methods(methods);
2853
2854 intArray* method_ordering = nullptr;
2855 // If JVMTI original method ordering or sharing is enabled construct int
2856 // array remembering the original ordering
2857 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2858 method_ordering = new intArray(length, length, -1);
2859 for (int index = 0; index < length; index++) {
2860 Method* const m = methods->at(index);
2861 const int old_index = m->vtable_index();
2862 assert(old_index >= 0 && old_index < length, "invalid method index");
2863 method_ordering->at_put(index, old_index);
2864 m->set_vtable_index(Method::invalid_vtable_index);
2865 }
2866 }
2867 return method_ordering;
2868 }
2869
2870 // Parse generic_signature attribute for methods and fields
2871 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2872 TRAPS) {
2873 assert(cfs != nullptr, "invariant");
2874
2875 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2876 const u2 generic_signature_index = cfs->get_u2_fast();
2877 guarantee_property(
2878 valid_symbol_at(generic_signature_index),
2879 "Invalid Signature attribute at constant pool index %u in class file %s",
2880 generic_signature_index, CHECK_0);
2881 return generic_signature_index;
2882 }
2883
2884 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2885 TRAPS) {
2886
2887 assert(cfs != nullptr, "invariant");
2888
2889 cfs->guarantee_more(2, CHECK); // sourcefile_index
2890 const u2 sourcefile_index = cfs->get_u2_fast();
2891 guarantee_property(
2892 valid_symbol_at(sourcefile_index),
2893 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2894 sourcefile_index, CHECK);
2895 set_class_sourcefile_index(sourcefile_index);
2896 }
2897
2898 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2899 int length,
2900 TRAPS) {
2901 assert(cfs != nullptr, "invariant");
2902
2903 const u1* const sde_buffer = cfs->current();
2904 assert(sde_buffer != nullptr, "null sde buffer");
2905
2906 // Don't bother storing it if there is no way to retrieve it
2907 if (JvmtiExport::can_get_source_debug_extension()) {
2908 assert((length+1) > length, "Overflow checking");
2909 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2910 for (int i = 0; i < length; i++) {
2911 sde[i] = sde_buffer[i];
2912 }
2913 sde[length] = '\0';
2914 set_class_sde_buffer((const char*)sde, length);
2915 }
2916 // Got utf8 string, set stream position forward
2917 cfs->skip_u1(length, CHECK);
2918 }
2919
2920
2921 // Inner classes can be static, private or protected (classic VM does this)
2922 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2923 JVM_ACC_PRIVATE | \
2924 JVM_ACC_PROTECTED | \
2925 JVM_ACC_STATIC \
2926 )
2927
2928 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2929 // Return -1 if none is found.
2930 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2931 Symbol* cp_klass_name = cp->klass_name_at(inner);
2932 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2933 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2934 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2935 return idx;
2936 }
2937 }
2938 return -1;
2939 }
2940
2941 // Return the outer_class_info_index for the InnerClasses entry containing the
2942 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2943 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2944 if (inner == 0) return -1;
2945 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2946 if (idx == -1) return -1;
2947 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2948 return result;
2949 }
2950
2951 // Return true if circularity is found, false if no circularity is found.
2952 // Use Floyd's cycle finding algorithm.
2953 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2954 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2955 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2956
2957 while (fast != -1 && fast != 0) {
2958 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2959 return true; // found a circularity
2960 }
2961 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2962 if (fast == -1) return false;
2963 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2964 if (fast == -1) return false;
2965 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2966 assert(slow != -1, "sanity check");
2967 }
2968 return false;
2969 }
2970
2971 // Loop through each InnerClasses entry checking for circularities and duplications
2972 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
2973 // return true if a circularity or entries with duplicate inner_class_info_indexes
2974 // are found.
2975 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2976 // Loop through each InnerClasses entry.
2977 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2978 // Return true if there are circular entries.
2979 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2980 return true;
2981 }
2982 // Check if there are duplicate entries or entries with the same inner_class_info_index.
2983 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2984 y += InstanceKlass::inner_class_next_offset) {
2985
2986 // 4347400: make sure there's no duplicate entry in the classes array
2987 if (_major_version >= JAVA_1_5_VERSION) {
2988 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2989 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2990 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2991 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2992 "Duplicate entry in InnerClasses attribute in class file %s",
2993 CHECK_(true));
2994 }
2995 // Return true if there are two entries with the same inner_class_info_index.
2996 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2997 return true;
2998 }
2999 }
3000 }
3001 return false;
3002 }
3003
3004 // Return number of classes in the inner classes attribute table
3005 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3006 const ConstantPool* cp,
3007 const u1* const inner_classes_attribute_start,
3008 bool parsed_enclosingmethod_attribute,
3009 u2 enclosing_method_class_index,
3010 u2 enclosing_method_method_index,
3011 TRAPS) {
3012 const u1* const current_mark = cfs->current();
3013 u2 length = 0;
3014 if (inner_classes_attribute_start != nullptr) {
3015 cfs->set_current(inner_classes_attribute_start);
3016 cfs->guarantee_more(2, CHECK_0); // length
3017 length = cfs->get_u2_fast();
3018 }
3019
3020 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3021 // method data:
3022 // [inner_class_info_index,
3023 // outer_class_info_index,
3024 // inner_name_index,
3025 // inner_class_access_flags,
3026 // ...
3027 // enclosing_method_class_index,
3028 // enclosing_method_method_index]
3029 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3030 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3031 _inner_classes = inner_classes;
3032
3033 int index = 0;
3034 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3035 for (int n = 0; n < length; n++) {
3036 // Inner class index
3037 const u2 inner_class_info_index = cfs->get_u2_fast();
3038 guarantee_property(
3039 valid_klass_reference_at(inner_class_info_index),
3040 "inner_class_info_index %u has bad constant type in class file %s",
3041 inner_class_info_index, CHECK_0);
3042 // Outer class index
3043 const u2 outer_class_info_index = cfs->get_u2_fast();
3044 guarantee_property(
3045 outer_class_info_index == 0 ||
3046 valid_klass_reference_at(outer_class_info_index),
3047 "outer_class_info_index %u has bad constant type in class file %s",
3048 outer_class_info_index, CHECK_0);
3049
3050 if (outer_class_info_index != 0) {
3051 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3052 char* bytes = (char*)outer_class_name->bytes();
3053 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3054 "Outer class is an array class in class file %s", CHECK_0);
3055 }
3056 // Inner class name
3057 const u2 inner_name_index = cfs->get_u2_fast();
3058 guarantee_property(
3059 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3060 "inner_name_index %u has bad constant type in class file %s",
3061 inner_name_index, CHECK_0);
3062 if (_need_verify) {
3063 guarantee_property(inner_class_info_index != outer_class_info_index,
3064 "Class is both outer and inner class in class file %s", CHECK_0);
3065 }
3066
3067 u2 recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3068 // JVM_ACC_MODULE is defined in JDK-9 and later.
3069 if (_major_version >= JAVA_9_VERSION) {
3070 recognized_modifiers |= JVM_ACC_MODULE;
3071 }
3072
3073 // Access flags
3074 u2 flags = cfs->get_u2_fast() & recognized_modifiers;
3075
3076 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3077 // Set abstract bit for old class files for backward compatibility
3078 flags |= JVM_ACC_ABSTRACT;
3079 }
3080
3081 if (!supports_inline_types()) {
3082 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3083 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3084 if (!is_module && !is_interface) {
3085 flags |= JVM_ACC_IDENTITY;
3086 }
3087 }
3088
3089 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3090 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3091 AccessFlags inner_access_flags(flags);
3092
3093 inner_classes->at_put(index++, inner_class_info_index);
3094 inner_classes->at_put(index++, outer_class_info_index);
3095 inner_classes->at_put(index++, inner_name_index);
3096 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3097 }
3098
3099 // Check for circular and duplicate entries.
3100 bool has_circularity = false;
3101 if (_need_verify) {
3102 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3103 if (has_circularity) {
3104 // If circularity check failed then ignore InnerClasses attribute.
3105 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3106 index = 0;
3107 if (parsed_enclosingmethod_attribute) {
3108 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3109 _inner_classes = inner_classes;
3110 } else {
3111 _inner_classes = Universe::the_empty_short_array();
3112 }
3113 }
3114 }
3115 // Set EnclosingMethod class and method indexes.
3116 if (parsed_enclosingmethod_attribute) {
3117 inner_classes->at_put(index++, enclosing_method_class_index);
3118 inner_classes->at_put(index++, enclosing_method_method_index);
3119 }
3120 assert(index == size || has_circularity, "wrong size");
3121
3122 // Restore buffer's current position.
3123 cfs->set_current(current_mark);
3124
3125 return length;
3126 }
3127
3128 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3129 const u1* const nest_members_attribute_start,
3130 TRAPS) {
3131 const u1* const current_mark = cfs->current();
3132 u2 length = 0;
3133 if (nest_members_attribute_start != nullptr) {
3134 cfs->set_current(nest_members_attribute_start);
3135 cfs->guarantee_more(2, CHECK_0); // length
3136 length = cfs->get_u2_fast();
3137 }
3138 const int size = length;
3139 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3140 _nest_members = nest_members;
3141
3142 int index = 0;
3143 cfs->guarantee_more(2 * length, CHECK_0);
3144 for (int n = 0; n < length; n++) {
3145 const u2 class_info_index = cfs->get_u2_fast();
3146 guarantee_property(
3147 valid_klass_reference_at(class_info_index),
3148 "Nest member class_info_index %u has bad constant type in class file %s",
3149 class_info_index, CHECK_0);
3150 nest_members->at_put(index++, class_info_index);
3151 }
3152 assert(index == size, "wrong size");
3153
3154 // Restore buffer's current position.
3155 cfs->set_current(current_mark);
3156
3157 return length;
3158 }
3159
3160 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3161 const u1* const permitted_subclasses_attribute_start,
3162 TRAPS) {
3163 const u1* const current_mark = cfs->current();
3164 u2 length = 0;
3165 if (permitted_subclasses_attribute_start != nullptr) {
3166 cfs->set_current(permitted_subclasses_attribute_start);
3167 cfs->guarantee_more(2, CHECK_0); // length
3168 length = cfs->get_u2_fast();
3169 }
3170 const int size = length;
3171 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3172 _permitted_subclasses = permitted_subclasses;
3173
3174 if (length > 0) {
3175 int index = 0;
3176 cfs->guarantee_more(2 * length, CHECK_0);
3177 for (int n = 0; n < length; n++) {
3178 const u2 class_info_index = cfs->get_u2_fast();
3179 guarantee_property(
3180 valid_klass_reference_at(class_info_index),
3181 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3182 class_info_index, CHECK_0);
3183 permitted_subclasses->at_put(index++, class_info_index);
3184 }
3185 assert(index == size, "wrong size");
3186 }
3187
3188 // Restore buffer's current position.
3189 cfs->set_current(current_mark);
3190
3191 return length;
3192 }
3193
3194 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3195 const u1* const loadable_descriptors_attribute_start,
3196 TRAPS) {
3197 const u1* const current_mark = cfs->current();
3198 u2 length = 0;
3199 if (loadable_descriptors_attribute_start != nullptr) {
3200 cfs->set_current(loadable_descriptors_attribute_start);
3201 cfs->guarantee_more(2, CHECK_0); // length
3202 length = cfs->get_u2_fast();
3203 }
3204 const int size = length;
3205 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3206 _loadable_descriptors = loadable_descriptors;
3207 if (length > 0) {
3208 int index = 0;
3209 cfs->guarantee_more(2 * length, CHECK_0);
3210 for (int n = 0; n < length; n++) {
3211 const u2 descriptor_index = cfs->get_u2_fast();
3212 guarantee_property(
3213 valid_symbol_at(descriptor_index),
3214 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3215 descriptor_index, CHECK_0);
3216 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3217 bool valid = legal_field_signature(descriptor, CHECK_0);
3218 if(!valid) {
3219 ResourceMark rm(THREAD);
3220 Exceptions::fthrow(THREAD_AND_LOCATION,
3221 vmSymbols::java_lang_ClassFormatError(),
3222 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3223 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3224 return 0;
3225 }
3226 loadable_descriptors->at_put(index++, descriptor_index);
3227 }
3228 assert(index == size, "wrong size");
3229 }
3230
3231 // Restore buffer's current position.
3232 cfs->set_current(current_mark);
3233
3234 return length;
3235 }
3236
3237 // Record {
3238 // u2 attribute_name_index;
3239 // u4 attribute_length;
3240 // u2 components_count;
3241 // component_info components[components_count];
3242 // }
3243 // component_info {
3244 // u2 name_index;
3245 // u2 descriptor_index
3246 // u2 attributes_count;
3247 // attribute_info_attributes[attributes_count];
3248 // }
3249 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3250 const ConstantPool* cp,
3251 const u1* const record_attribute_start,
3252 TRAPS) {
3253 const u1* const current_mark = cfs->current();
3254 int components_count = 0;
3255 unsigned int calculate_attr_size = 0;
3256 if (record_attribute_start != nullptr) {
3257 cfs->set_current(record_attribute_start);
3258 cfs->guarantee_more(2, CHECK_0); // num of components
3259 components_count = (int)cfs->get_u2_fast();
3260 calculate_attr_size = 2;
3261 }
3262
3263 Array<RecordComponent*>* const record_components =
3264 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3265 _record_components = record_components;
3266
3267 for (int x = 0; x < components_count; x++) {
3268 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3269
3270 const u2 name_index = cfs->get_u2_fast();
3271 guarantee_property(valid_symbol_at(name_index),
3272 "Invalid constant pool index %u for name in Record attribute in class file %s",
3273 name_index, CHECK_0);
3274 const Symbol* const name = cp->symbol_at(name_index);
3275 verify_legal_field_name(name, CHECK_0);
3276
3277 const u2 descriptor_index = cfs->get_u2_fast();
3278 guarantee_property(valid_symbol_at(descriptor_index),
3279 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3280 descriptor_index, CHECK_0);
3281 const Symbol* const descr = cp->symbol_at(descriptor_index);
3282 verify_legal_field_signature(name, descr, CHECK_0);
3283
3284 const u2 attributes_count = cfs->get_u2_fast();
3285 calculate_attr_size += 6;
3286 u2 generic_sig_index = 0;
3287 const u1* runtime_visible_annotations = nullptr;
3288 int runtime_visible_annotations_length = 0;
3289 bool runtime_invisible_annotations_exists = false;
3290 const u1* runtime_visible_type_annotations = nullptr;
3291 int runtime_visible_type_annotations_length = 0;
3292 bool runtime_invisible_type_annotations_exists = false;
3293
3294 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3295 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3296 for (int y = 0; y < attributes_count; y++) {
3297 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3298 const u2 attribute_name_index = cfs->get_u2_fast();
3299 const u4 attribute_length = cfs->get_u4_fast();
3300 calculate_attr_size += 6;
3301 guarantee_property(
3302 valid_symbol_at(attribute_name_index),
3303 "Invalid Record attribute name index %u in class file %s",
3304 attribute_name_index, CHECK_0);
3305
3306 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3307 if (attribute_name == vmSymbols::tag_signature()) {
3308 if (generic_sig_index != 0) {
3309 classfile_parse_error(
3310 "Multiple Signature attributes for Record component in class file %s",
3311 THREAD);
3312 return 0;
3313 }
3314 if (attribute_length != 2) {
3315 classfile_parse_error(
3316 "Invalid Signature attribute length %u in Record component in class file %s",
3317 attribute_length, THREAD);
3318 return 0;
3319 }
3320 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3321
3322 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3323 if (runtime_visible_annotations != nullptr) {
3324 classfile_parse_error(
3325 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3326 return 0;
3327 }
3328 runtime_visible_annotations_length = attribute_length;
3329 runtime_visible_annotations = cfs->current();
3330
3331 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3332 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3333 cfs->skip_u1_fast(runtime_visible_annotations_length);
3334
3335 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3336 if (runtime_invisible_annotations_exists) {
3337 classfile_parse_error(
3338 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3339 return 0;
3340 }
3341 runtime_invisible_annotations_exists = true;
3342 cfs->skip_u1(attribute_length, CHECK_0);
3343
3344 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3345 if (runtime_visible_type_annotations != nullptr) {
3346 classfile_parse_error(
3347 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3348 return 0;
3349 }
3350 runtime_visible_type_annotations_length = attribute_length;
3351 runtime_visible_type_annotations = cfs->current();
3352
3353 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3354 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3355 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3356
3357 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3358 if (runtime_invisible_type_annotations_exists) {
3359 classfile_parse_error(
3360 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3361 return 0;
3362 }
3363 runtime_invisible_type_annotations_exists = true;
3364 cfs->skip_u1(attribute_length, CHECK_0);
3365
3366 } else {
3367 // Skip unknown attributes
3368 cfs->skip_u1(attribute_length, CHECK_0);
3369 }
3370 calculate_attr_size += attribute_length;
3371 } // End of attributes For loop
3372
3373 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3374 runtime_visible_annotations_length,
3375 CHECK_0);
3376 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3377 runtime_visible_type_annotations_length,
3378 CHECK_0);
3379
3380 RecordComponent* record_component =
3381 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3382 annotations, type_annotations, CHECK_0);
3383 record_components->at_put(x, record_component);
3384 } // End of component processing loop
3385
3386 // Restore buffer's current position.
3387 cfs->set_current(current_mark);
3388 return calculate_attr_size;
3389 }
3390
3391 void ClassFileParser::parse_classfile_synthetic_attribute() {
3392 set_class_synthetic_flag(true);
3393 }
3394
3395 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3396 assert(cfs != nullptr, "invariant");
3397
3398 const u2 signature_index = cfs->get_u2(CHECK);
3399 guarantee_property(
3400 valid_symbol_at(signature_index),
3401 "Invalid constant pool index %u in Signature attribute in class file %s",
3402 signature_index, CHECK);
3403 set_class_generic_signature_index(signature_index);
3404 }
3405
3406 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3407 ConstantPool* cp,
3408 u4 attribute_byte_length,
3409 TRAPS) {
3410 assert(cfs != nullptr, "invariant");
3411 assert(cp != nullptr, "invariant");
3412
3413 const u1* const current_start = cfs->current();
3414
3415 guarantee_property(attribute_byte_length >= sizeof(u2),
3416 "Invalid BootstrapMethods attribute length %u in class file %s",
3417 attribute_byte_length,
3418 CHECK);
3419
3420 cfs->guarantee_more(attribute_byte_length, CHECK);
3421
3422 const int attribute_array_length = cfs->get_u2_fast();
3423
3424 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3425 "Short length on BootstrapMethods in class file %s",
3426 CHECK);
3427
3428
3429 // The attribute contains a counted array of counted tuples of shorts,
3430 // represending bootstrap specifiers:
3431 // length*{bootstrap_method_index, argument_count*{argument_index}}
3432 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3433 // operand_count = number of shorts in attr, except for leading length
3434
3435 // The attribute is copied into a short[] array.
3436 // The array begins with a series of short[2] pairs, one for each tuple.
3437 const int index_size = (attribute_array_length * 2);
3438
3439 Array<u2>* const operands =
3440 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3441
3442 // Eagerly assign operands so they will be deallocated with the constant
3443 // pool if there is an error.
3444 cp->set_operands(operands);
3445
3446 int operand_fill_index = index_size;
3447 const int cp_size = cp->length();
3448
3449 for (int n = 0; n < attribute_array_length; n++) {
3450 // Store a 32-bit offset into the header of the operand array.
3451 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3452
3453 // Read a bootstrap specifier.
3454 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3455 const u2 bootstrap_method_index = cfs->get_u2_fast();
3456 const u2 argument_count = cfs->get_u2_fast();
3457 guarantee_property(
3458 valid_cp_range(bootstrap_method_index, cp_size) &&
3459 cp->tag_at(bootstrap_method_index).is_method_handle(),
3460 "bootstrap_method_index %u has bad constant type in class file %s",
3461 bootstrap_method_index,
3462 CHECK);
3463
3464 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3465 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3466 CHECK);
3467
3468 operands->at_put(operand_fill_index++, bootstrap_method_index);
3469 operands->at_put(operand_fill_index++, argument_count);
3470
3471 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3472 for (int j = 0; j < argument_count; j++) {
3473 const u2 argument_index = cfs->get_u2_fast();
3474 guarantee_property(
3475 valid_cp_range(argument_index, cp_size) &&
3476 cp->tag_at(argument_index).is_loadable_constant(),
3477 "argument_index %u has bad constant type in class file %s",
3478 argument_index,
3479 CHECK);
3480 operands->at_put(operand_fill_index++, argument_index);
3481 }
3482 }
3483 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3484 "Bad length on BootstrapMethods in class file %s",
3485 CHECK);
3486 }
3487
3488 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3489 ConstantPool* cp,
3490 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3491 TRAPS) {
3492 assert(cfs != nullptr, "invariant");
3493 assert(cp != nullptr, "invariant");
3494 assert(parsed_annotations != nullptr, "invariant");
3495
3496 // Set inner classes attribute to default sentinel
3497 _inner_classes = Universe::the_empty_short_array();
3498 // Set nest members attribute to default sentinel
3499 _nest_members = Universe::the_empty_short_array();
3500 // Set _permitted_subclasses attribute to default sentinel
3501 _permitted_subclasses = Universe::the_empty_short_array();
3502 // Set _loadable_descriptors attribute to default sentinel
3503 _loadable_descriptors = Universe::the_empty_short_array();
3504 cfs->guarantee_more(2, CHECK); // attributes_count
3505 u2 attributes_count = cfs->get_u2_fast();
3506 bool parsed_sourcefile_attribute = false;
3507 bool parsed_innerclasses_attribute = false;
3508 bool parsed_nest_members_attribute = false;
3509 bool parsed_permitted_subclasses_attribute = false;
3510 bool parsed_loadable_descriptors_attribute = false;
3511 bool parsed_nest_host_attribute = false;
3512 bool parsed_record_attribute = false;
3513 bool parsed_enclosingmethod_attribute = false;
3514 bool parsed_bootstrap_methods_attribute = false;
3515 const u1* runtime_visible_annotations = nullptr;
3516 int runtime_visible_annotations_length = 0;
3517 const u1* runtime_visible_type_annotations = nullptr;
3518 int runtime_visible_type_annotations_length = 0;
3519 bool runtime_invisible_type_annotations_exists = false;
3520 bool runtime_invisible_annotations_exists = false;
3521 bool parsed_source_debug_ext_annotations_exist = false;
3522 const u1* inner_classes_attribute_start = nullptr;
3523 u4 inner_classes_attribute_length = 0;
3524 u2 enclosing_method_class_index = 0;
3525 u2 enclosing_method_method_index = 0;
3526 const u1* nest_members_attribute_start = nullptr;
3527 u4 nest_members_attribute_length = 0;
3528 const u1* record_attribute_start = nullptr;
3529 u4 record_attribute_length = 0;
3530 const u1* permitted_subclasses_attribute_start = nullptr;
3531 u4 permitted_subclasses_attribute_length = 0;
3532 const u1* loadable_descriptors_attribute_start = nullptr;
3533 u4 loadable_descriptors_attribute_length = 0;
3534
3535 // Iterate over attributes
3536 while (attributes_count--) {
3537 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3538 const u2 attribute_name_index = cfs->get_u2_fast();
3539 const u4 attribute_length = cfs->get_u4_fast();
3540 guarantee_property(
3541 valid_symbol_at(attribute_name_index),
3542 "Attribute name has bad constant pool index %u in class file %s",
3543 attribute_name_index, CHECK);
3544 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3545 if (tag == vmSymbols::tag_source_file()) {
3546 // Check for SourceFile tag
3547 if (_need_verify) {
3548 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3549 }
3550 if (parsed_sourcefile_attribute) {
3551 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3552 return;
3553 } else {
3554 parsed_sourcefile_attribute = true;
3555 }
3556 parse_classfile_sourcefile_attribute(cfs, CHECK);
3557 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3558 // Check for SourceDebugExtension tag
3559 if (parsed_source_debug_ext_annotations_exist) {
3560 classfile_parse_error(
3561 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3562 return;
3563 }
3564 parsed_source_debug_ext_annotations_exist = true;
3565 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3566 } else if (tag == vmSymbols::tag_inner_classes()) {
3567 // Check for InnerClasses tag
3568 if (parsed_innerclasses_attribute) {
3569 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3570 return;
3571 } else {
3572 parsed_innerclasses_attribute = true;
3573 }
3574 inner_classes_attribute_start = cfs->current();
3575 inner_classes_attribute_length = attribute_length;
3576 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3577 } else if (tag == vmSymbols::tag_synthetic()) {
3578 // Check for Synthetic tag
3579 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3580 if (attribute_length != 0) {
3581 classfile_parse_error(
3582 "Invalid Synthetic classfile attribute length %u in class file %s",
3583 attribute_length, THREAD);
3584 return;
3585 }
3586 parse_classfile_synthetic_attribute();
3587 } else if (tag == vmSymbols::tag_deprecated()) {
3588 // Check for Deprecated tag - 4276120
3589 if (attribute_length != 0) {
3590 classfile_parse_error(
3591 "Invalid Deprecated classfile attribute length %u in class file %s",
3592 attribute_length, THREAD);
3593 return;
3594 }
3595 } else if (_major_version >= JAVA_1_5_VERSION) {
3596 if (tag == vmSymbols::tag_signature()) {
3597 if (_generic_signature_index != 0) {
3598 classfile_parse_error(
3599 "Multiple Signature attributes in class file %s", THREAD);
3600 return;
3601 }
3602 if (attribute_length != 2) {
3603 classfile_parse_error(
3604 "Wrong Signature attribute length %u in class file %s",
3605 attribute_length, THREAD);
3606 return;
3607 }
3608 parse_classfile_signature_attribute(cfs, CHECK);
3609 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3610 if (runtime_visible_annotations != nullptr) {
3611 classfile_parse_error(
3612 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3613 return;
3614 }
3615 runtime_visible_annotations_length = attribute_length;
3616 runtime_visible_annotations = cfs->current();
3617 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3618 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3619 parse_annotations(cp,
3620 runtime_visible_annotations,
3621 runtime_visible_annotations_length,
3622 parsed_annotations,
3623 _loader_data,
3624 _can_access_vm_annotations);
3625 cfs->skip_u1_fast(runtime_visible_annotations_length);
3626 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3627 if (runtime_invisible_annotations_exists) {
3628 classfile_parse_error(
3629 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3630 return;
3631 }
3632 runtime_invisible_annotations_exists = true;
3633 cfs->skip_u1(attribute_length, CHECK);
3634 } else if (tag == vmSymbols::tag_enclosing_method()) {
3635 if (parsed_enclosingmethod_attribute) {
3636 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3637 return;
3638 } else {
3639 parsed_enclosingmethod_attribute = true;
3640 }
3641 guarantee_property(attribute_length == 4,
3642 "Wrong EnclosingMethod attribute length %u in class file %s",
3643 attribute_length, CHECK);
3644 cfs->guarantee_more(4, CHECK); // class_index, method_index
3645 enclosing_method_class_index = cfs->get_u2_fast();
3646 enclosing_method_method_index = cfs->get_u2_fast();
3647 if (enclosing_method_class_index == 0) {
3648 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3649 return;
3650 }
3651 // Validate the constant pool indices and types
3652 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3653 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3654 if (enclosing_method_method_index != 0 &&
3655 (!cp->is_within_bounds(enclosing_method_method_index) ||
3656 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3657 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3658 return;
3659 }
3660 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3661 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3662 if (parsed_bootstrap_methods_attribute) {
3663 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3664 return;
3665 }
3666 parsed_bootstrap_methods_attribute = true;
3667 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3668 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3669 if (runtime_visible_type_annotations != nullptr) {
3670 classfile_parse_error(
3671 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3672 return;
3673 }
3674 runtime_visible_type_annotations_length = attribute_length;
3675 runtime_visible_type_annotations = cfs->current();
3676 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3677 // No need for the VM to parse Type annotations
3678 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3679 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3680 if (runtime_invisible_type_annotations_exists) {
3681 classfile_parse_error(
3682 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3683 return;
3684 }
3685 runtime_invisible_type_annotations_exists = true;
3686 cfs->skip_u1(attribute_length, CHECK);
3687 } else if (_major_version >= JAVA_11_VERSION) {
3688 if (tag == vmSymbols::tag_nest_members()) {
3689 // Check for NestMembers tag
3690 if (parsed_nest_members_attribute) {
3691 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3692 return;
3693 } else {
3694 parsed_nest_members_attribute = true;
3695 }
3696 if (parsed_nest_host_attribute) {
3697 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3698 return;
3699 }
3700 nest_members_attribute_start = cfs->current();
3701 nest_members_attribute_length = attribute_length;
3702 cfs->skip_u1(nest_members_attribute_length, CHECK);
3703 } else if (tag == vmSymbols::tag_nest_host()) {
3704 if (parsed_nest_host_attribute) {
3705 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3706 return;
3707 } else {
3708 parsed_nest_host_attribute = true;
3709 }
3710 if (parsed_nest_members_attribute) {
3711 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3712 return;
3713 }
3714 if (_need_verify) {
3715 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3716 }
3717 cfs->guarantee_more(2, CHECK);
3718 u2 class_info_index = cfs->get_u2_fast();
3719 guarantee_property(
3720 valid_klass_reference_at(class_info_index),
3721 "Nest-host class_info_index %u has bad constant type in class file %s",
3722 class_info_index, CHECK);
3723 _nest_host = class_info_index;
3724
3725 } else if (_major_version >= JAVA_16_VERSION) {
3726 if (tag == vmSymbols::tag_record()) {
3727 if (parsed_record_attribute) {
3728 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3729 return;
3730 }
3731 parsed_record_attribute = true;
3732 record_attribute_start = cfs->current();
3733 record_attribute_length = attribute_length;
3734 } else if (_major_version >= JAVA_17_VERSION) {
3735 if (tag == vmSymbols::tag_permitted_subclasses()) {
3736 if (parsed_permitted_subclasses_attribute) {
3737 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3738 return;
3739 }
3740 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3741 if (_access_flags.is_final()) {
3742 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3743 return;
3744 }
3745 parsed_permitted_subclasses_attribute = true;
3746 permitted_subclasses_attribute_start = cfs->current();
3747 permitted_subclasses_attribute_length = attribute_length;
3748 }
3749 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3750 if (parsed_loadable_descriptors_attribute) {
3751 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3752 return;
3753 }
3754 parsed_loadable_descriptors_attribute = true;
3755 loadable_descriptors_attribute_start = cfs->current();
3756 loadable_descriptors_attribute_length = attribute_length;
3757 }
3758 }
3759 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3760 cfs->skip_u1(attribute_length, CHECK);
3761 } else {
3762 // Unknown attribute
3763 cfs->skip_u1(attribute_length, CHECK);
3764 }
3765 } else {
3766 // Unknown attribute
3767 cfs->skip_u1(attribute_length, CHECK);
3768 }
3769 } else {
3770 // Unknown attribute
3771 cfs->skip_u1(attribute_length, CHECK);
3772 }
3773 }
3774 _class_annotations = allocate_annotations(runtime_visible_annotations,
3775 runtime_visible_annotations_length,
3776 CHECK);
3777 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3778 runtime_visible_type_annotations_length,
3779 CHECK);
3780
3781 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3782 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3783 cfs,
3784 cp,
3785 inner_classes_attribute_start,
3786 parsed_innerclasses_attribute,
3787 enclosing_method_class_index,
3788 enclosing_method_method_index,
3789 CHECK);
3790 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3791 guarantee_property(
3792 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3793 "Wrong InnerClasses attribute length in class file %s", CHECK);
3794 }
3795 }
3796
3797 if (parsed_nest_members_attribute) {
3798 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3799 cfs,
3800 nest_members_attribute_start,
3801 CHECK);
3802 if (_need_verify) {
3803 guarantee_property(
3804 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3805 "Wrong NestMembers attribute length in class file %s", CHECK);
3806 }
3807 }
3808
3809 if (parsed_record_attribute) {
3810 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3811 cfs,
3812 cp,
3813 record_attribute_start,
3814 CHECK);
3815 if (_need_verify) {
3816 guarantee_property(record_attribute_length == calculated_attr_length,
3817 "Record attribute has wrong length in class file %s",
3818 CHECK);
3819 }
3820 }
3821
3822 if (parsed_permitted_subclasses_attribute) {
3823 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3824 cfs,
3825 permitted_subclasses_attribute_start,
3826 CHECK);
3827 if (_need_verify) {
3828 guarantee_property(
3829 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3830 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3831 }
3832 }
3833
3834 if (parsed_loadable_descriptors_attribute) {
3835 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3836 cfs,
3837 loadable_descriptors_attribute_start,
3838 CHECK);
3839 if (_need_verify) {
3840 guarantee_property(
3841 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3842 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3843 }
3844 }
3845
3846 if (_max_bootstrap_specifier_index >= 0) {
3847 guarantee_property(parsed_bootstrap_methods_attribute,
3848 "Missing BootstrapMethods attribute in class file %s", CHECK);
3849 }
3850 }
3851
3852 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3853 assert(k != nullptr, "invariant");
3854
3855 if (_synthetic_flag)
3856 k->set_is_synthetic();
3857 if (_sourcefile_index != 0) {
3858 k->set_source_file_name_index(_sourcefile_index);
3859 }
3860 if (_generic_signature_index != 0) {
3861 k->set_generic_signature_index(_generic_signature_index);
3862 }
3863 if (_sde_buffer != nullptr) {
3864 k->set_source_debug_extension(_sde_buffer, _sde_length);
3865 }
3866 }
3867
3868 // Create the Annotations object that will
3869 // hold the annotations array for the Klass.
3870 void ClassFileParser::create_combined_annotations(TRAPS) {
3871 if (_class_annotations == nullptr &&
3872 _class_type_annotations == nullptr &&
3873 _fields_annotations == nullptr &&
3874 _fields_type_annotations == nullptr) {
3875 // Don't create the Annotations object unnecessarily.
3876 return;
3877 }
3878
3879 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3880 annotations->set_class_annotations(_class_annotations);
3881 annotations->set_class_type_annotations(_class_type_annotations);
3882 annotations->set_fields_annotations(_fields_annotations);
3883 annotations->set_fields_type_annotations(_fields_type_annotations);
3884
3885 // This is the Annotations object that will be
3886 // assigned to InstanceKlass being constructed.
3887 _combined_annotations = annotations;
3888
3889 // The annotations arrays below has been transferred the
3890 // _combined_annotations so these fields can now be cleared.
3891 _class_annotations = nullptr;
3892 _class_type_annotations = nullptr;
3893 _fields_annotations = nullptr;
3894 _fields_type_annotations = nullptr;
3895 }
3896
3897 // Transfer ownership of metadata allocated to the InstanceKlass.
3898 void ClassFileParser::apply_parsed_class_metadata(
3899 InstanceKlass* this_klass,
3900 int java_fields_count) {
3901 assert(this_klass != nullptr, "invariant");
3902
3903 _cp->set_pool_holder(this_klass);
3904 this_klass->set_constants(_cp);
3905 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3906 this_klass->set_fields_status(_fields_status);
3907 this_klass->set_methods(_methods);
3908 this_klass->set_inner_classes(_inner_classes);
3909 this_klass->set_nest_members(_nest_members);
3910 this_klass->set_nest_host_index(_nest_host);
3911 this_klass->set_loadable_descriptors(_loadable_descriptors);
3912 this_klass->set_annotations(_combined_annotations);
3913 this_klass->set_permitted_subclasses(_permitted_subclasses);
3914 this_klass->set_record_components(_record_components);
3915 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3916
3917 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3918 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3919 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3920 // its _super. If an OOM occurs while loading the current klass, its _super field
3921 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3922 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3923 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3924
3925 // Clear out these fields so they don't get deallocated by the destructor
3926 clear_class_metadata();
3927 }
3928
3929 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3930 int anno_length,
3931 TRAPS) {
3932 AnnotationArray* annotations = nullptr;
3933 if (anno != nullptr) {
3934 annotations = MetadataFactory::new_array<u1>(_loader_data,
3935 anno_length,
3936 CHECK_(annotations));
3937 for (int i = 0; i < anno_length; i++) {
3938 annotations->at_put(i, anno[i]);
3939 }
3940 }
3941 return annotations;
3942 }
3943
3944 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3945 const int super_class_index,
3946 const bool need_verify,
3947 TRAPS) {
3948 assert(cp != nullptr, "invariant");
3949 const InstanceKlass* super_klass = nullptr;
3950
3951 if (super_class_index == 0) {
3952 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3953 "Invalid superclass index 0 in class file %s",
3954 CHECK_NULL);
3955 } else {
3956 guarantee_property(valid_klass_reference_at(super_class_index),
3957 "Invalid superclass index %u in class file %s",
3958 super_class_index,
3959 CHECK_NULL);
3960 // The class name should be legal because it is checked when parsing constant pool.
3961 // However, make sure it is not an array type.
3962 if (cp->tag_at(super_class_index).is_klass()) {
3963 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3964 }
3965 if (need_verify) {
3966 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3967 guarantee_property(!is_array,
3968 "Bad superclass name in class file %s", CHECK_NULL);
3969 }
3970 }
3971 return super_klass;
3972 }
3973
3974 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3975 _max_nonstatic_oop_maps = max_blocks;
3976 _nonstatic_oop_map_count = 0;
3977 if (max_blocks == 0) {
3978 _nonstatic_oop_maps = nullptr;
3979 } else {
3980 _nonstatic_oop_maps =
3981 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3982 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3983 }
3984 }
3985
3986 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3987 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3988 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3989 }
3990
3991 // addition of super oop maps
3992 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3993 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3994 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3995
3996 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3997 _nonstatic_oop_map_count += nof_blocks;
3998 }
3999
4000 // collection of oops
4001 void OopMapBlocksBuilder::add(int offset, int count) {
4002 if (_nonstatic_oop_map_count == 0) {
4003 _nonstatic_oop_map_count++;
4004 }
4005 OopMapBlock* nonstatic_oop_map = last_oop_map();
4006 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4007 nonstatic_oop_map->set_offset(offset);
4008 nonstatic_oop_map->set_count(count);
4009 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4010 nonstatic_oop_map->increment_count(count);
4011 } else { // Need a new one...
4012 _nonstatic_oop_map_count++;
4013 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4014 nonstatic_oop_map = last_oop_map();
4015 nonstatic_oop_map->set_offset(offset);
4016 nonstatic_oop_map->set_count(count);
4017 }
4018 }
4019
4020 // general purpose copy, e.g. into allocated instanceKlass
4021 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4022 if (_nonstatic_oop_map_count != 0) {
4023 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4024 }
4025 }
4026
4027 // Sort and compact adjacent blocks
4028 void OopMapBlocksBuilder::compact() {
4029 if (_nonstatic_oop_map_count <= 1) {
4030 return;
4031 }
4032 /*
4033 * Since field layout sneaks in oops before values, we will be able to condense
4034 * blocks. There is potential to compact between super, own refs and values
4035 * containing refs.
4036 *
4037 * Currently compaction is slightly limited due to values being 8 byte aligned.
4038 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4039 * and maybe it doesn't need to be.
4040 */
4041 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4042 (_sort_Fn)OopMapBlock::compare_offset);
4043 if (_nonstatic_oop_map_count < 2) {
4044 return;
4045 }
4046
4047 // Make a temp copy, and iterate through and copy back into the original
4048 ResourceMark rm;
4049 OopMapBlock* oop_maps_copy =
4050 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4051 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4052 copy(oop_maps_copy);
4053 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4054 unsigned int new_count = 1;
4055 oop_maps_copy++;
4056 while(oop_maps_copy < oop_maps_copy_end) {
4057 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4058 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4059 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4060 } else {
4061 nonstatic_oop_map++;
4062 new_count++;
4063 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4064 nonstatic_oop_map->set_count(oop_maps_copy->count());
4065 }
4066 oop_maps_copy++;
4067 }
4068 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4069 _nonstatic_oop_map_count = new_count;
4070 }
4071
4072 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4073 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4074 if (_nonstatic_oop_map_count > 0) {
4075 OopMapBlock* map = _nonstatic_oop_maps;
4076 OopMapBlock* last_map = last_oop_map();
4077 assert(map <= last_map, "Last less than first");
4078 while (map <= last_map) {
4079 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4080 map->offset() + map->offset_span() - heapOopSize, map->count());
4081 map++;
4082 }
4083 }
4084 }
4085
4086 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4087 print_on(st);
4088 }
4089
4090 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4091 assert(ik != nullptr, "invariant");
4092
4093 const InstanceKlass* const super = ik->java_super();
4094
4095 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4096 // in which case we don't have to register objects as finalizable
4097 if (!_has_empty_finalizer) {
4098 if (_has_finalizer ||
4099 (super != nullptr && super->has_finalizer())) {
4100 ik->set_has_finalizer();
4101 }
4102 }
4103
4104 #ifdef ASSERT
4105 bool f = false;
4106 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4107 vmSymbols::void_method_signature());
4108 if (InstanceKlass::is_finalization_enabled() &&
4109 (m != nullptr) && !m->is_empty_method()) {
4110 f = true;
4111 }
4112
4113 // Spec doesn't prevent agent from redefinition of empty finalizer.
4114 // Despite the fact that it's generally bad idea and redefined finalizer
4115 // will not work as expected we shouldn't abort vm in this case
4116 if (!ik->has_redefined_this_or_super()) {
4117 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4118 }
4119 #endif
4120
4121 // Check if this klass supports the java.lang.Cloneable interface
4122 if (vmClasses::Cloneable_klass_loaded()) {
4123 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4124 ik->set_is_cloneable();
4125 }
4126 }
4127
4128 // If it cannot be fast-path allocated, set a bit in the layout helper.
4129 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4130 assert(ik->size_helper() > 0, "layout_helper is initialized");
4131 if (ik->is_abstract() || ik->is_interface()
4132 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4133 || ik->size_helper() >= FastAllocateSizeLimit) {
4134 // Forbid fast-path allocation.
4135 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4136 ik->set_layout_helper(lh);
4137 }
4138 }
4139
4140 bool ClassFileParser::supports_inline_types() const {
4141 // Inline types are only supported by class file version 69.65535 and later
4142 return _major_version > JAVA_25_VERSION ||
4143 (_major_version == JAVA_25_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4144 }
4145
4146 // utility methods for appending an array with check for duplicates
4147
4148 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4149 const Array<InstanceKlass*>* const ifs) {
4150 // iterate over new interfaces
4151 for (int i = 0; i < ifs->length(); i++) {
4152 InstanceKlass* const e = ifs->at(i);
4153 assert(e->is_klass() && e->is_interface(), "just checking");
4154 // add new interface
4155 result->append_if_missing(e);
4156 }
4157 }
4158
4159 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4160 Array<InstanceKlass*>* local_ifs,
4161 ClassLoaderData* loader_data,
4162 TRAPS) {
4163 assert(local_ifs != nullptr, "invariant");
4164 assert(loader_data != nullptr, "invariant");
4165
4166 // Compute maximum size for transitive interfaces
4167 int max_transitive_size = 0;
4168 int super_size = 0;
4169 // Add superclass transitive interfaces size
4170 if (super != nullptr) {
4171 super_size = super->transitive_interfaces()->length();
4172 max_transitive_size += super_size;
4173 }
4174 // Add local interfaces' super interfaces
4175 const int local_size = local_ifs->length();
4176 for (int i = 0; i < local_size; i++) {
4177 InstanceKlass* const l = local_ifs->at(i);
4178 max_transitive_size += l->transitive_interfaces()->length();
4179 }
4180 // Finally add local interfaces
4181 max_transitive_size += local_size;
4182 // Construct array
4183 if (max_transitive_size == 0) {
4184 // no interfaces, use canonicalized array
4185 return Universe::the_empty_instance_klass_array();
4186 } else if (max_transitive_size == super_size) {
4187 // no new local interfaces added, share superklass' transitive interface array
4188 return super->transitive_interfaces();
4189 // The three lines below are commented to work around bug JDK-8245487
4190 // } else if (max_transitive_size == local_size) {
4191 // // only local interfaces added, share local interface array
4192 // return local_ifs;
4193 } else {
4194 ResourceMark rm;
4195 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4196
4197 // Copy down from superclass
4198 if (super != nullptr) {
4199 append_interfaces(result, super->transitive_interfaces());
4200 }
4201
4202 // Copy down from local interfaces' superinterfaces
4203 for (int i = 0; i < local_size; i++) {
4204 InstanceKlass* const l = local_ifs->at(i);
4205 append_interfaces(result, l->transitive_interfaces());
4206 }
4207 // Finally add local interfaces
4208 append_interfaces(result, local_ifs);
4209
4210 // length will be less than the max_transitive_size if duplicates were removed
4211 const int length = result->length();
4212 assert(length <= max_transitive_size, "just checking");
4213
4214 Array<InstanceKlass*>* const new_result =
4215 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4216 for (int i = 0; i < length; i++) {
4217 InstanceKlass* const e = result->at(i);
4218 assert(e != nullptr, "just checking");
4219 new_result->at_put(i, e);
4220 }
4221 return new_result;
4222 }
4223 }
4224
4225 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4226 assert(this_klass != nullptr, "invariant");
4227 const Klass* const super = this_klass->super();
4228
4229 if (super != nullptr) {
4230 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4231
4232 if (super->is_final()) {
4233 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4234 return;
4235 }
4236
4237 if (super_ik->is_sealed()) {
4238 stringStream ss;
4239 ResourceMark rm(THREAD);
4240 if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
4241 classfile_icce_error(ss.as_string(), THREAD);
4242 return;
4243 }
4244 }
4245
4246 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4247 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4248 // for a value classes. So, it is treated as a special case for now.
4249 if (!this_klass->access_flags().is_identity_class() &&
4250 super_ik->name() != vmSymbols::java_lang_Object() &&
4251 super_ik->is_identity_class()) {
4252 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4253 return;
4254 }
4255
4256 Reflection::VerifyClassAccessResults vca_result =
4257 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4258 if (vca_result != Reflection::ACCESS_OK) {
4259 ResourceMark rm(THREAD);
4260 char* msg = Reflection::verify_class_access_msg(this_klass,
4261 InstanceKlass::cast(super),
4262 vca_result);
4263
4264 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4265 if (msg == nullptr) {
4266 bool same_module = (this_klass->module() == super->module());
4267 Exceptions::fthrow(
4268 THREAD_AND_LOCATION,
4269 vmSymbols::java_lang_IllegalAccessError(),
4270 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4271 this_klass->external_name(),
4272 super->is_abstract() ? "abstract " : "",
4273 super->external_name(),
4274 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4275 (same_module) ? "" : "; ",
4276 (same_module) ? "" : super->class_in_module_of_loader());
4277 } else {
4278 // Add additional message content.
4279 Exceptions::fthrow(
4280 THREAD_AND_LOCATION,
4281 vmSymbols::java_lang_IllegalAccessError(),
4282 "superclass access check failed: %s",
4283 msg);
4284 }
4285 }
4286 }
4287 }
4288
4289
4290 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4291 assert(this_klass != nullptr, "invariant");
4292 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4293 const int lng = local_interfaces->length();
4294 for (int i = lng - 1; i >= 0; i--) {
4295 InstanceKlass* const k = local_interfaces->at(i);
4296 assert (k != nullptr && k->is_interface(), "invalid interface");
4297
4298 if (k->is_sealed()) {
4299 stringStream ss;
4300 ResourceMark rm(THREAD);
4301 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4302 classfile_icce_error(ss.as_string(), THREAD);
4303 return;
4304 }
4305 }
4306
4307 Reflection::VerifyClassAccessResults vca_result =
4308 Reflection::verify_class_access(this_klass, k, false);
4309 if (vca_result != Reflection::ACCESS_OK) {
4310 ResourceMark rm(THREAD);
4311 char* msg = Reflection::verify_class_access_msg(this_klass,
4312 k,
4313 vca_result);
4314
4315 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4316 if (msg == nullptr) {
4317 bool same_module = (this_klass->module() == k->module());
4318 Exceptions::fthrow(
4319 THREAD_AND_LOCATION,
4320 vmSymbols::java_lang_IllegalAccessError(),
4321 "class %s cannot access its superinterface %s (%s%s%s)",
4322 this_klass->external_name(),
4323 k->external_name(),
4324 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4325 (same_module) ? "" : "; ",
4326 (same_module) ? "" : k->class_in_module_of_loader());
4327 return;
4328 } else {
4329 // Add additional message content.
4330 Exceptions::fthrow(
4331 THREAD_AND_LOCATION,
4332 vmSymbols::java_lang_IllegalAccessError(),
4333 "superinterface check failed: %s",
4334 msg);
4335 return;
4336 }
4337 }
4338 }
4339 }
4340
4341
4342 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4343 assert(this_klass != nullptr, "invariant");
4344 const Array<Method*>* const methods = this_klass->methods();
4345 const int num_methods = methods->length();
4346
4347 // go thru each method and check if it overrides a final method
4348 for (int index = 0; index < num_methods; index++) {
4349 const Method* const m = methods->at(index);
4350
4351 // skip private, static, and <init> methods
4352 if ((!m->is_private() && !m->is_static()) &&
4353 (m->name() != vmSymbols::object_initializer_name())) {
4354
4355 const Symbol* const name = m->name();
4356 const Symbol* const signature = m->signature();
4357 const InstanceKlass* k = this_klass->java_super();
4358 const Method* super_m = nullptr;
4359 while (k != nullptr) {
4360 // skip supers that don't have final methods.
4361 if (k->has_final_method()) {
4362 // lookup a matching method in the super class hierarchy
4363 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4364 if (super_m == nullptr) {
4365 break; // didn't find any match; get out
4366 }
4367
4368 if (super_m->is_final() && !super_m->is_static() &&
4369 !super_m->access_flags().is_private()) {
4370 // matching method in super is final, and not static or private
4371 bool can_access = Reflection::verify_member_access(this_klass,
4372 super_m->method_holder(),
4373 super_m->method_holder(),
4374 super_m->access_flags(),
4375 false, false, CHECK);
4376 if (can_access) {
4377 // this class can access super final method and therefore override
4378 ResourceMark rm(THREAD);
4379 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4380 err_msg("class %s overrides final method %s.%s%s",
4381 this_klass->external_name(),
4382 super_m->method_holder()->external_name(),
4383 name->as_C_string(),
4384 signature->as_C_string()));
4385 }
4386 }
4387
4388 // continue to look from super_m's holder's super.
4389 k = super_m->method_holder()->java_super();
4390 continue;
4391 }
4392
4393 k = k->java_super();
4394 }
4395 }
4396 }
4397 }
4398
4399
4400 // assumes that this_klass is an interface
4401 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4402 assert(this_klass != nullptr, "invariant");
4403 assert(this_klass->is_interface(), "not an interface");
4404 const Array<Method*>* methods = this_klass->methods();
4405 const int num_methods = methods->length();
4406
4407 for (int index = 0; index < num_methods; index++) {
4408 const Method* const m = methods->at(index);
4409 // if m is static and not the init method, throw a verify error
4410 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4411 ResourceMark rm(THREAD);
4412
4413 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4414 Exceptions::fthrow(
4415 THREAD_AND_LOCATION,
4416 vmSymbols::java_lang_VerifyError(),
4417 "Illegal static method %s in interface %s",
4418 m->name()->as_C_string(),
4419 this_klass->external_name()
4420 );
4421 return;
4422 }
4423 }
4424 }
4425
4426 // utility methods for format checking
4427
4428 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4429 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4430 const bool is_inner_class = name != nullptr;
4431 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4432 if (is_module) {
4433 ResourceMark rm(THREAD);
4434 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4435 Exceptions::fthrow(
4436 THREAD_AND_LOCATION,
4437 vmSymbols::java_lang_NoClassDefFoundError(),
4438 "%s is not a class because access_flag ACC_MODULE is set",
4439 _class_name->as_C_string());
4440 return;
4441 }
4442
4443 if (!_need_verify) { return; }
4444
4445 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4446 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4447 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4448 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4449 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4450 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4451 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4452 const bool valid_value_class = is_identity || is_interface ||
4453 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4454
4455 if ((is_abstract && is_final) ||
4456 (is_interface && !is_abstract) ||
4457 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4458 (!is_interface && major_gte_1_5 && is_annotation) ||
4459 (!valid_value_class)) {
4460 ResourceMark rm(THREAD);
4461 const char* class_note = "";
4462 if (!valid_value_class) {
4463 class_note = " (a value class must be final or else abstract)";
4464 }
4465 if (name == nullptr) { // Not an inner class
4466 Exceptions::fthrow(
4467 THREAD_AND_LOCATION,
4468 vmSymbols::java_lang_ClassFormatError(),
4469 "Illegal class modifiers in class %s%s: 0x%X",
4470 _class_name->as_C_string(), class_note, flags
4471 );
4472 return;
4473 } else {
4474 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4475 Exceptions::fthrow(
4476 THREAD_AND_LOCATION,
4477 vmSymbols::java_lang_ClassFormatError(),
4478 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4479 name, class_note, _class_name->as_C_string(), flags
4480 );
4481 return;
4482 }
4483 }
4484 }
4485
4486 static bool has_illegal_visibility(jint flags) {
4487 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4488 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4489 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4490
4491 return ((is_public && is_protected) ||
4492 (is_public && is_private) ||
4493 (is_protected && is_private));
4494 }
4495
4496 // A legal major_version.minor_version must be one of the following:
4497 //
4498 // Major_version >= 45 and major_version < 56, any minor_version.
4499 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4500 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4501 //
4502 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4503 ResourceMark rm(THREAD);
4504 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4505 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4506 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4507 class_name, major, minor, THREAD);
4508 return;
4509 }
4510
4511 if (major > max_version) {
4512 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4513 Exceptions::fthrow(
4514 THREAD_AND_LOCATION,
4515 vmSymbols::java_lang_UnsupportedClassVersionError(),
4516 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4517 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4518 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4519 return;
4520 }
4521
4522 if (major < JAVA_12_VERSION || minor == 0) {
4523 return;
4524 }
4525
4526 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4527 if (major != max_version) {
4528 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4529 Exceptions::fthrow(
4530 THREAD_AND_LOCATION,
4531 vmSymbols::java_lang_UnsupportedClassVersionError(),
4532 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4533 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4534 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4535 return;
4536 }
4537
4538 if (!Arguments::enable_preview()) {
4539 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4540 class_name, major, minor, THREAD);
4541 return;
4542 }
4543
4544 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4545 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4546 class_name, major, minor, THREAD);
4547 }
4548 }
4549
4550 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4551 AccessFlags class_access_flags,
4552 TRAPS) const {
4553 if (!_need_verify) { return; }
4554
4555 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4556 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4557 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4558 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4559 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4560 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4561 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4562 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4563 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4564 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4565
4566 const bool is_interface = class_access_flags.is_interface();
4567 const bool is_identity_class = class_access_flags.is_identity_class();
4568
4569 bool is_illegal = false;
4570 const char* error_msg = "";
4571
4572 // There is some overlap in the checks that apply, for example interface fields
4573 // must be static, static fields can't be strict, and therefore interfaces can't
4574 // have strict fields. So we don't have to check every possible invalid combination
4575 // individually as long as all are covered. Once we have found an illegal combination
4576 // we can stop checking.
4577
4578 if (supports_inline_types()) {
4579 if (is_strict && is_static) {
4580 is_illegal = true;
4581 error_msg = "field cannot be strict and static";
4582 }
4583 else if (is_strict && !is_final) {
4584 is_illegal = true;
4585 error_msg = "strict field must be final";
4586 }
4587 }
4588
4589 if (!is_illegal) {
4590 if (is_interface) {
4591 if (!is_public || !is_static || !is_final || is_private ||
4592 is_protected || is_volatile || is_transient ||
4593 (major_gte_1_5 && is_enum)) {
4594 is_illegal = true;
4595 error_msg = "interface fields must be public, static and final, and may be synthetic";
4596 }
4597 } else { // not interface
4598 if (has_illegal_visibility(flags)) {
4599 is_illegal = true;
4600 error_msg = "invalid visibility flags for class field";
4601 } else if (is_final && is_volatile) {
4602 is_illegal = true;
4603 error_msg = "fields cannot be final and volatile";
4604 } else if (supports_inline_types()) {
4605 if (!is_identity_class && !is_static && !is_strict) {
4606 is_illegal = true;
4607 error_msg = "value class fields must be either strict or static";
4608 }
4609 }
4610 }
4611 }
4612
4613 if (is_illegal) {
4614 ResourceMark rm(THREAD);
4615 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4616 Exceptions::fthrow(
4617 THREAD_AND_LOCATION,
4618 vmSymbols::java_lang_ClassFormatError(),
4619 "Illegal field modifiers (%s) in class %s: 0x%X",
4620 error_msg, _class_name->as_C_string(), flags);
4621 return;
4622 }
4623 }
4624
4625 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4626 AccessFlags class_access_flags,
4627 const Symbol* name,
4628 TRAPS) const {
4629 if (!_need_verify) { return; }
4630
4631 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4632 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4633 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4634 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4635 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4636 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4637 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4638 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4639 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4640 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4641 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4642 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4643 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4644 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4645 // LW401 CR required: removal of value factories support
4646 const bool is_interface = class_access_flags.is_interface();
4647 const bool is_identity_class = class_access_flags.is_identity_class();
4648 const bool is_abstract_class = class_access_flags.is_abstract();
4649
4650 bool is_illegal = false;
4651
4652 const char* class_note = "";
4653 if (is_interface) {
4654 if (major_gte_8) {
4655 // Class file version is JAVA_8_VERSION or later Methods of
4656 // interfaces may set any of the flags except ACC_PROTECTED,
4657 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4658 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4659 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4660 (is_native || is_protected || is_final || is_synchronized) ||
4661 // If a specific method of a class or interface has its
4662 // ACC_ABSTRACT flag set, it must not have any of its
4663 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4664 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4665 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4666 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4667 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4668 is_illegal = true;
4669 }
4670 } else if (major_gte_1_5) {
4671 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4672 if (!is_public || is_private || is_protected || is_static || is_final ||
4673 is_synchronized || is_native || !is_abstract || is_strict) {
4674 is_illegal = true;
4675 }
4676 } else {
4677 // Class file version is pre-JAVA_1_5_VERSION
4678 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4679 is_illegal = true;
4680 }
4681 }
4682 } else { // not interface
4683 if (has_illegal_visibility(flags)) {
4684 is_illegal = true;
4685 } else {
4686 if (is_initializer) {
4687 if (is_static || is_final || is_synchronized || is_native ||
4688 is_abstract || (major_gte_1_5 && is_bridge)) {
4689 is_illegal = true;
4690 }
4691 } else { // not initializer
4692 if (!is_identity_class && is_synchronized && !is_static) {
4693 is_illegal = true;
4694 class_note = " (not an identity class)";
4695 } else {
4696 if (is_abstract) {
4697 if ((is_final || is_native || is_private || is_static ||
4698 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4699 is_illegal = true;
4700 }
4701 }
4702 }
4703 }
4704 }
4705 }
4706
4707 if (is_illegal) {
4708 ResourceMark rm(THREAD);
4709 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4710 Exceptions::fthrow(
4711 THREAD_AND_LOCATION,
4712 vmSymbols::java_lang_ClassFormatError(),
4713 "Method %s in class %s%s has illegal modifiers: 0x%X",
4714 name->as_C_string(), _class_name->as_C_string(),
4715 class_note, flags);
4716 return;
4717 }
4718 }
4719
4720 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4721 int length,
4722 TRAPS) const {
4723 assert(_need_verify, "only called when _need_verify is true");
4724 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4725 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4726 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4727 }
4728 }
4729
4730 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4731 // In class names, '/' separates unqualified names. This is verified in this function also.
4732 // Method names also may not contain the characters '<' or '>', unless <init>
4733 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4734 // method. Because these names have been checked as special cases before
4735 // calling this method in verify_legal_method_name.
4736 //
4737 // This method is also called from the modular system APIs in modules.cpp
4738 // to verify the validity of module and package names.
4739 bool ClassFileParser::verify_unqualified_name(const char* name,
4740 unsigned int length,
4741 int type) {
4742 if (length == 0) return false; // Must have at least one char.
4743 for (const char* p = name; p != name + length; p++) {
4744 switch(*p) {
4745 case JVM_SIGNATURE_DOT:
4746 case JVM_SIGNATURE_ENDCLASS:
4747 case JVM_SIGNATURE_ARRAY:
4748 // do not permit '.', ';', or '['
4749 return false;
4750 case JVM_SIGNATURE_SLASH:
4751 // check for '//' or leading or trailing '/' which are not legal
4752 // unqualified name must not be empty
4753 if (type == ClassFileParser::LegalClass) {
4754 if (p == name || p+1 >= name+length ||
4755 *(p+1) == JVM_SIGNATURE_SLASH) {
4756 return false;
4757 }
4758 } else {
4759 return false; // do not permit '/' unless it's class name
4760 }
4761 break;
4762 case JVM_SIGNATURE_SPECIAL:
4763 case JVM_SIGNATURE_ENDSPECIAL:
4764 // do not permit '<' or '>' in method names
4765 if (type == ClassFileParser::LegalMethod) {
4766 return false;
4767 }
4768 }
4769 }
4770 return true;
4771 }
4772
4773 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4774 if (_loadable_descriptors == nullptr) return false;
4775 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4776 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4777 if (class_name == klass) return true;
4778 }
4779 return false;
4780 }
4781
4782 // Take pointer to a UTF8 byte string (not NUL-terminated).
4783 // Skip over the longest part of the string that could
4784 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4785 // Return a pointer to just past the fieldname.
4786 // Return null if no fieldname at all was found, or in the case of slash_ok
4787 // being true, we saw consecutive slashes (meaning we were looking for a
4788 // qualified path but found something that was badly-formed).
4789 static const char* skip_over_field_name(const char* const name,
4790 bool slash_ok,
4791 unsigned int length) {
4792 const char* p;
4793 jboolean last_is_slash = false;
4794 jboolean not_first_ch = false;
4795
4796 for (p = name; p != name + length; not_first_ch = true) {
4797 const char* old_p = p;
4798 jchar ch = *p;
4799 if (ch < 128) {
4800 p++;
4801 // quick check for ascii
4802 if ((ch >= 'a' && ch <= 'z') ||
4803 (ch >= 'A' && ch <= 'Z') ||
4804 (ch == '_' || ch == '$') ||
4805 (not_first_ch && ch >= '0' && ch <= '9')) {
4806 last_is_slash = false;
4807 continue;
4808 }
4809 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4810 if (last_is_slash) {
4811 return nullptr; // Don't permit consecutive slashes
4812 }
4813 last_is_slash = true;
4814 continue;
4815 }
4816 }
4817 else {
4818 jint unicode_ch;
4819 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4820 p = tmp_p;
4821 last_is_slash = false;
4822 // Check if ch is Java identifier start or is Java identifier part
4823 // 4672820: call java.lang.Character methods directly without generating separate tables.
4824 EXCEPTION_MARK;
4825 // return value
4826 JavaValue result(T_BOOLEAN);
4827 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4828 JavaCallArguments args;
4829 args.push_int(unicode_ch);
4830
4831 if (not_first_ch) {
4832 // public static boolean isJavaIdentifierPart(char ch);
4833 JavaCalls::call_static(&result,
4834 vmClasses::Character_klass(),
4835 vmSymbols::isJavaIdentifierPart_name(),
4836 vmSymbols::int_bool_signature(),
4837 &args,
4838 THREAD);
4839 } else {
4840 // public static boolean isJavaIdentifierStart(char ch);
4841 JavaCalls::call_static(&result,
4842 vmClasses::Character_klass(),
4843 vmSymbols::isJavaIdentifierStart_name(),
4844 vmSymbols::int_bool_signature(),
4845 &args,
4846 THREAD);
4847 }
4848 if (HAS_PENDING_EXCEPTION) {
4849 CLEAR_PENDING_EXCEPTION;
4850 return nullptr;
4851 }
4852 if(result.get_jboolean()) {
4853 continue;
4854 }
4855 }
4856 return (not_first_ch) ? old_p : nullptr;
4857 }
4858 return (not_first_ch && !last_is_slash) ? p : nullptr;
4859 }
4860
4861 // Take pointer to a UTF8 byte string (not NUL-terminated).
4862 // Skip over the longest part of the string that could
4863 // be taken as a field signature. Allow "void" if void_ok.
4864 // Return a pointer to just past the signature.
4865 // Return null if no legal signature is found.
4866 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4867 bool void_ok,
4868 unsigned int length,
4869 TRAPS) const {
4870 unsigned int array_dim = 0;
4871 while (length > 0) {
4872 switch (signature[0]) {
4873 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4874 case JVM_SIGNATURE_BOOLEAN:
4875 case JVM_SIGNATURE_BYTE:
4876 case JVM_SIGNATURE_CHAR:
4877 case JVM_SIGNATURE_SHORT:
4878 case JVM_SIGNATURE_INT:
4879 case JVM_SIGNATURE_FLOAT:
4880 case JVM_SIGNATURE_LONG:
4881 case JVM_SIGNATURE_DOUBLE:
4882 return signature + 1;
4883 case JVM_SIGNATURE_CLASS:
4884 {
4885 if (_major_version < JAVA_1_5_VERSION) {
4886 // Skip over the class name if one is there
4887 const char* const p = skip_over_field_name(signature + 1, true, --length);
4888
4889 // The next character better be a semicolon
4890 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4891 return p + 1;
4892 }
4893 }
4894 else {
4895 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4896 signature++;
4897 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4898 // Format check signature
4899 if (c != nullptr) {
4900 int newlen = pointer_delta_as_int(c, (char*) signature);
4901 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4902 if (!legal) {
4903 classfile_parse_error("Class name is empty or contains illegal character "
4904 "in descriptor in class file %s",
4905 THREAD);
4906 return nullptr;
4907 }
4908 return signature + newlen + 1;
4909 }
4910 }
4911 return nullptr;
4912 }
4913 case JVM_SIGNATURE_ARRAY:
4914 array_dim++;
4915 if (array_dim > 255) {
4916 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4917 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4918 return nullptr;
4919 }
4920 // The rest of what's there better be a legal signature
4921 signature++;
4922 length--;
4923 void_ok = false;
4924 break;
4925 default:
4926 return nullptr;
4927 }
4928 }
4929 return nullptr;
4930 }
4931
4932 // Checks if name is a legal class name.
4933 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4934 if (!_need_verify) { return; }
4935
4936 assert(name->refcount() > 0, "symbol must be kept alive");
4937 char* bytes = (char*)name->bytes();
4938 unsigned int length = name->utf8_length();
4939 bool legal = false;
4940
4941 if (length > 0) {
4942 const char* p;
4943 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4944 p = skip_over_field_signature(bytes, false, length, CHECK);
4945 legal = (p != nullptr) && ((p - bytes) == (int)length);
4946 } else if (_major_version < JAVA_1_5_VERSION) {
4947 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4948 p = skip_over_field_name(bytes, true, length);
4949 legal = (p != nullptr) && ((p - bytes) == (int)length);
4950 }
4951 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4952 && bytes[length - 1] == ';' ) {
4953 // Support for L...; descriptors
4954 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4955 } else {
4956 // 4900761: relax the constraints based on JSR202 spec
4957 // Class names may be drawn from the entire Unicode character set.
4958 // Identifiers between '/' must be unqualified names.
4959 // The utf8 string has been verified when parsing cpool entries.
4960 legal = verify_unqualified_name(bytes, length, LegalClass);
4961 }
4962 }
4963 if (!legal) {
4964 ResourceMark rm(THREAD);
4965 assert(_class_name != nullptr, "invariant");
4966 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4967 Exceptions::fthrow(
4968 THREAD_AND_LOCATION,
4969 vmSymbols::java_lang_ClassFormatError(),
4970 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4971 _class_name->as_C_string()
4972 );
4973 return;
4974 }
4975 }
4976
4977 // Checks if name is a legal field name.
4978 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4979 if (!_need_verify) { return; }
4980
4981 char* bytes = (char*)name->bytes();
4982 unsigned int length = name->utf8_length();
4983 bool legal = false;
4984
4985 if (length > 0) {
4986 if (_major_version < JAVA_1_5_VERSION) {
4987 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4988 const char* p = skip_over_field_name(bytes, false, length);
4989 legal = (p != nullptr) && ((p - bytes) == (int)length);
4990 }
4991 } else {
4992 // 4881221: relax the constraints based on JSR202 spec
4993 legal = verify_unqualified_name(bytes, length, LegalField);
4994 }
4995 }
4996
4997 if (!legal) {
4998 ResourceMark rm(THREAD);
4999 assert(_class_name != nullptr, "invariant");
5000 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5001 Exceptions::fthrow(
5002 THREAD_AND_LOCATION,
5003 vmSymbols::java_lang_ClassFormatError(),
5004 "Illegal field name \"%.*s\" in class %s", length, bytes,
5005 _class_name->as_C_string()
5006 );
5007 return;
5008 }
5009 }
5010
5011 // Checks if name is a legal method name.
5012 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5013 if (!_need_verify) { return; }
5014
5015 assert(name != nullptr, "method name is null");
5016 char* bytes = (char*)name->bytes();
5017 unsigned int length = name->utf8_length();
5018 bool legal = false;
5019
5020 if (length > 0) {
5021 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5022 if (name == vmSymbols::object_initializer_name() ||
5023 name == vmSymbols::class_initializer_name()) {
5024 legal = true;
5025 }
5026 } else if (_major_version < JAVA_1_5_VERSION) {
5027 const char* p;
5028 p = skip_over_field_name(bytes, false, length);
5029 legal = (p != nullptr) && ((p - bytes) == (int)length);
5030 } else {
5031 // 4881221: relax the constraints based on JSR202 spec
5032 legal = verify_unqualified_name(bytes, length, LegalMethod);
5033 }
5034 }
5035
5036 if (!legal) {
5037 ResourceMark rm(THREAD);
5038 assert(_class_name != nullptr, "invariant");
5039 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5040 Exceptions::fthrow(
5041 THREAD_AND_LOCATION,
5042 vmSymbols::java_lang_ClassFormatError(),
5043 "Illegal method name \"%.*s\" in class %s", length, bytes,
5044 _class_name->as_C_string()
5045 );
5046 return;
5047 }
5048 }
5049
5050 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5051 const char* const bytes = (const char*)signature->bytes();
5052 const unsigned int length = signature->utf8_length();
5053 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5054
5055 if (p == nullptr || (p - bytes) != (int)length) {
5056 return false;
5057 }
5058 return true;
5059 }
5060
5061 // Checks if signature is a legal field signature.
5062 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5063 const Symbol* signature,
5064 TRAPS) const {
5065 if (!_need_verify) { return; }
5066
5067 const char* const bytes = (const char*)signature->bytes();
5068 const unsigned int length = signature->utf8_length();
5069 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5070
5071 if (p == nullptr || (p - bytes) != (int)length) {
5072 throwIllegalSignature("Field", name, signature, CHECK);
5073 }
5074 }
5075
5076 // Check that the signature is compatible with the method name. For example,
5077 // check that <init> has a void signature.
5078 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5079 const Symbol* signature,
5080 TRAPS) const {
5081 if (!_need_verify) {
5082 return;
5083 }
5084
5085 // Class initializers cannot have args for class format version >= 51.
5086 if (name == vmSymbols::class_initializer_name() &&
5087 signature != vmSymbols::void_method_signature() &&
5088 _major_version >= JAVA_7_VERSION) {
5089 throwIllegalSignature("Method", name, signature, THREAD);
5090 return;
5091 }
5092
5093 int sig_length = signature->utf8_length();
5094 if (name->utf8_length() > 0 &&
5095 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5096 sig_length > 0 &&
5097 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5098 throwIllegalSignature("Method", name, signature, THREAD);
5099 }
5100 }
5101
5102 // Checks if signature is a legal method signature.
5103 // Returns number of parameters
5104 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5105 const Symbol* signature,
5106 TRAPS) const {
5107 if (!_need_verify) {
5108 // make sure caller's args_size will be less than 0 even for non-static
5109 // method so it will be recomputed in compute_size_of_parameters().
5110 return -2;
5111 }
5112
5113 unsigned int args_size = 0;
5114 const char* p = (const char*)signature->bytes();
5115 unsigned int length = signature->utf8_length();
5116 const char* nextp;
5117
5118 // The first character must be a '('
5119 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5120 length--;
5121 // Skip over legal field signatures
5122 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5123 while ((length > 0) && (nextp != nullptr)) {
5124 args_size++;
5125 if (p[0] == 'J' || p[0] == 'D') {
5126 args_size++;
5127 }
5128 length -= pointer_delta_as_int(nextp, p);
5129 p = nextp;
5130 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5131 }
5132 // The first non-signature thing better be a ')'
5133 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5134 length--;
5135 // Now we better just have a return value
5136 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5137 if (nextp && ((int)length == (nextp - p))) {
5138 return args_size;
5139 }
5140 }
5141 }
5142 // Report error
5143 throwIllegalSignature("Method", name, signature, THREAD);
5144 return 0;
5145 }
5146
5147 int ClassFileParser::static_field_size() const {
5148 assert(_layout_info != nullptr, "invariant");
5149 return _layout_info->_static_field_size;
5150 }
5151
5152 int ClassFileParser::total_oop_map_count() const {
5153 assert(_layout_info != nullptr, "invariant");
5154 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5155 }
5156
5157 jint ClassFileParser::layout_size() const {
5158 assert(_layout_info != nullptr, "invariant");
5159 return _layout_info->_instance_size;
5160 }
5161
5162 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5163 const Array<Method*>* methods) {
5164 assert(ik != nullptr, "invariant");
5165 assert(methods != nullptr, "invariant");
5166
5167 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5168 // (We used to do this lazily, but now we query it in Rewriter,
5169 // which is eagerly done for every method, so we might as well do it now,
5170 // when everything is fresh in memory.)
5171 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5172
5173 if (klass_id != vmSymbolID::NO_SID) {
5174 for (int j = 0; j < methods->length(); ++j) {
5175 Method* method = methods->at(j);
5176 method->init_intrinsic_id(klass_id);
5177
5178 if (CheckIntrinsics) {
5179 // Check if an intrinsic is defined for method 'method',
5180 // but the method is not annotated with @IntrinsicCandidate.
5181 if (method->intrinsic_id() != vmIntrinsics::_none &&
5182 !method->intrinsic_candidate()) {
5183 tty->print("Compiler intrinsic is defined for method [%s], "
5184 "but the method is not annotated with @IntrinsicCandidate.%s",
5185 method->name_and_sig_as_C_string(),
5186 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5187 );
5188 tty->cr();
5189 DEBUG_ONLY(vm_exit(1));
5190 }
5191 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5192 // but there is no intrinsic available for it.
5193 if (method->intrinsic_candidate() &&
5194 method->intrinsic_id() == vmIntrinsics::_none) {
5195 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5196 "but no compiler intrinsic is defined for the method.%s",
5197 method->name_and_sig_as_C_string(),
5198 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5199 );
5200 tty->cr();
5201 DEBUG_ONLY(vm_exit(1));
5202 }
5203 }
5204 } // end for
5205
5206 #ifdef ASSERT
5207 if (CheckIntrinsics) {
5208 // Check for orphan methods in the current class. A method m
5209 // of a class C is orphan if an intrinsic is defined for method m,
5210 // but class C does not declare m.
5211 // The check is potentially expensive, therefore it is available
5212 // only in debug builds.
5213
5214 for (auto id : EnumRange<vmIntrinsicID>{}) {
5215 if (vmIntrinsics::_compiledLambdaForm == id) {
5216 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5217 // generated for the JVM from a LambdaForm and therefore no method
5218 // is defined for it.
5219 continue;
5220 }
5221 if (vmIntrinsics::_blackhole == id) {
5222 // The _blackhole intrinsic is a special marker. No explicit method
5223 // is defined for it.
5224 continue;
5225 }
5226
5227 if (vmIntrinsics::class_for(id) == klass_id) {
5228 // Check if the current class contains a method with the same
5229 // name, flags, signature.
5230 bool match = false;
5231 for (int j = 0; j < methods->length(); ++j) {
5232 const Method* method = methods->at(j);
5233 if (method->intrinsic_id() == id) {
5234 match = true;
5235 break;
5236 }
5237 }
5238
5239 if (!match) {
5240 char buf[1000];
5241 tty->print("Compiler intrinsic is defined for method [%s], "
5242 "but the method is not available in class [%s].%s",
5243 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5244 ik->name()->as_C_string(),
5245 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5246 );
5247 tty->cr();
5248 DEBUG_ONLY(vm_exit(1));
5249 }
5250 }
5251 } // end for
5252 } // CheckIntrinsics
5253 #endif // ASSERT
5254 }
5255 }
5256
5257 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5258 const ClassInstanceInfo& cl_inst_info,
5259 TRAPS) {
5260 if (_klass != nullptr) {
5261 return _klass;
5262 }
5263
5264 InstanceKlass* const ik =
5265 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5266
5267 if (is_hidden()) {
5268 mangle_hidden_class_name(ik);
5269 }
5270
5271 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5272
5273 assert(_klass == ik, "invariant");
5274 return ik;
5275 }
5276
5277 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5278 bool changed_by_loadhook,
5279 const ClassInstanceInfo& cl_inst_info,
5280 TRAPS) {
5281 assert(ik != nullptr, "invariant");
5282
5283 // Set name and CLD before adding to CLD
5284 ik->set_class_loader_data(_loader_data);
5285 ik->set_name(_class_name);
5286
5287 // Add all classes to our internal class loader list here,
5288 // including classes in the bootstrap (null) class loader.
5289 const bool publicize = !is_internal();
5290
5291 _loader_data->add_class(ik, publicize);
5292
5293 set_klass_to_deallocate(ik);
5294
5295 assert(_layout_info != nullptr, "invariant");
5296 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5297 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5298 "sanity");
5299
5300 assert(ik->is_instance_klass(), "sanity");
5301 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5302
5303 // Fill in information already parsed
5304 ik->set_should_verify_class(_need_verify);
5305
5306 // Not yet: supers are done below to support the new subtype-checking fields
5307 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5308 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5309
5310 if (_layout_info->_is_naturally_atomic) {
5311 ik->set_is_naturally_atomic();
5312 }
5313
5314 if (_layout_info->_must_be_atomic) {
5315 ik->set_must_be_atomic();
5316 }
5317 if (_is_implicitly_constructible) {
5318 ik->set_is_implicitly_constructible();
5319 }
5320
5321 ik->set_static_oop_field_count(_static_oop_count);
5322
5323 // this transfers ownership of a lot of arrays from
5324 // the parser onto the InstanceKlass*
5325 apply_parsed_class_metadata(ik, _java_fields_count);
5326 if (ik->is_inline_klass()) {
5327 InlineKlass::cast(ik)->init_fixed_block();
5328 }
5329
5330 // can only set dynamic nest-host after static nest information is set
5331 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5332 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5333 }
5334
5335 // note that is not safe to use the fields in the parser from this point on
5336 assert(nullptr == _cp, "invariant");
5337 assert(nullptr == _fieldinfo_stream, "invariant");
5338 assert(nullptr == _fields_status, "invariant");
5339 assert(nullptr == _methods, "invariant");
5340 assert(nullptr == _inner_classes, "invariant");
5341 assert(nullptr == _nest_members, "invariant");
5342 assert(nullptr == _loadable_descriptors, "invariant");
5343 assert(nullptr == _combined_annotations, "invariant");
5344 assert(nullptr == _record_components, "invariant");
5345 assert(nullptr == _permitted_subclasses, "invariant");
5346 assert(nullptr == _inline_layout_info_array, "invariant");
5347
5348 if (_has_localvariable_table) {
5349 ik->set_has_localvariable_table(true);
5350 }
5351
5352 if (_has_final_method) {
5353 ik->set_has_final_method();
5354 }
5355
5356 ik->copy_method_ordering(_method_ordering, CHECK);
5357 // The InstanceKlass::_methods_jmethod_ids cache
5358 // is managed on the assumption that the initial cache
5359 // size is equal to the number of methods in the class. If
5360 // that changes, then InstanceKlass::idnum_can_increment()
5361 // has to be changed accordingly.
5362 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5363
5364 ik->set_this_class_index(_this_class_index);
5365
5366 if (_is_hidden) {
5367 // _this_class_index is a CONSTANT_Class entry that refers to this
5368 // hidden class itself. If this class needs to refer to its own methods
5369 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5370 // _this_class_index. However, because this class is hidden (it's
5371 // not stored in SystemDictionary), _this_class_index cannot be resolved
5372 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5373 // Therefore, we must eagerly resolve _this_class_index now.
5374 ik->constants()->klass_at_put(_this_class_index, ik);
5375 }
5376
5377 ik->set_minor_version(_minor_version);
5378 ik->set_major_version(_major_version);
5379 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5380 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5381
5382 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5383
5384 // Set PackageEntry for this_klass
5385 oop cl = ik->class_loader();
5386 Handle clh = Handle(THREAD, cl);
5387 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5388 ik->set_package(cld, nullptr, CHECK);
5389
5390 const Array<Method*>* const methods = ik->methods();
5391 assert(methods != nullptr, "invariant");
5392 const int methods_len = methods->length();
5393
5394 check_methods_for_intrinsics(ik, methods);
5395
5396 // Fill in field values obtained by parse_classfile_attributes
5397 if (_parsed_annotations->has_any_annotations()) {
5398 _parsed_annotations->apply_to(ik);
5399 }
5400
5401 apply_parsed_class_attributes(ik);
5402
5403 // Miranda methods
5404 if ((_num_miranda_methods > 0) ||
5405 // if this class introduced new miranda methods or
5406 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5407 // super class exists and this class inherited miranda methods
5408 ) {
5409 ik->set_has_miranda_methods(); // then set a flag
5410 }
5411
5412 // Fill in information needed to compute superclasses.
5413 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5414 ik->set_transitive_interfaces(_transitive_interfaces);
5415 ik->set_local_interfaces(_local_interfaces);
5416 _transitive_interfaces = nullptr;
5417 _local_interfaces = nullptr;
5418
5419 // Initialize itable offset tables
5420 klassItable::setup_itable_offset_table(ik);
5421
5422 // Compute transitive closure of interfaces this class implements
5423 // Do final class setup
5424 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5425 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5426 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5427 }
5428
5429 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5430 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5431 ik->set_has_contended_annotations(true);
5432 }
5433
5434 // Fill in has_finalizer and layout_helper
5435 set_precomputed_flags(ik);
5436
5437 // check if this class can access its super class
5438 check_super_class_access(ik, CHECK);
5439
5440 // check if this class can access its superinterfaces
5441 check_super_interface_access(ik, CHECK);
5442
5443 // check if this class overrides any final method
5444 check_final_method_override(ik, CHECK);
5445
5446 // reject static interface methods prior to Java 8
5447 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5448 check_illegal_static_method(ik, CHECK);
5449 }
5450
5451 // Obtain this_klass' module entry
5452 ModuleEntry* module_entry = ik->module();
5453 assert(module_entry != nullptr, "module_entry should always be set");
5454
5455 // Obtain java.lang.Module
5456 Handle module_handle(THREAD, module_entry->module());
5457
5458 // Allocate mirror and initialize static fields
5459 java_lang_Class::create_mirror(ik,
5460 Handle(THREAD, _loader_data->class_loader()),
5461 module_handle,
5462 _protection_domain,
5463 cl_inst_info.class_data(),
5464 CHECK);
5465
5466 assert(_all_mirandas != nullptr, "invariant");
5467
5468 // Generate any default methods - default methods are public interface methods
5469 // that have a default implementation. This is new with Java 8.
5470 if (_has_nonstatic_concrete_methods) {
5471 DefaultMethods::generate_default_methods(ik,
5472 _all_mirandas,
5473 CHECK);
5474 }
5475
5476 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5477 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5478 !module_entry->has_default_read_edges()) {
5479 if (!module_entry->set_has_default_read_edges()) {
5480 // We won a potential race
5481 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5482 }
5483 }
5484
5485 if (is_inline_type()) {
5486 InlineKlass* vk = InlineKlass::cast(ik);
5487 vk->set_payload_alignment(_layout_info->_payload_alignment);
5488 vk->set_payload_offset(_layout_info->_payload_offset);
5489 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5490 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5491 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5492 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5493 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5494 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5495 vk->set_default_value_offset(_layout_info->_default_value_offset);
5496 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5497 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5498 vk->initialize_calling_convention(CHECK);
5499 }
5500
5501 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5502
5503 if (!is_internal()) {
5504 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5505
5506 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5507 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5508 log_is_enabled(Info, class, preview)) {
5509 ResourceMark rm;
5510 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5511 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5512 }
5513
5514 if (log_is_enabled(Debug, class, resolve)) {
5515 ResourceMark rm;
5516 // print out the superclass.
5517 const char * from = ik->external_name();
5518 if (ik->java_super() != nullptr) {
5519 log_debug(class, resolve)("%s %s (super)",
5520 from,
5521 ik->java_super()->external_name());
5522 }
5523 // print out each of the interface classes referred to by this class.
5524 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5525 if (local_interfaces != nullptr) {
5526 const int length = local_interfaces->length();
5527 for (int i = 0; i < length; i++) {
5528 const InstanceKlass* const k = local_interfaces->at(i);
5529 const char * to = k->external_name();
5530 log_debug(class, resolve)("%s %s (interface)", from, to);
5531 }
5532 }
5533 }
5534 }
5535
5536 JFR_ONLY(INIT_ID(ik);)
5537
5538 // If we reach here, all is well.
5539 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5540 // in order for it to not be destroyed in the ClassFileParser destructor.
5541 set_klass_to_deallocate(nullptr);
5542
5543 // it's official
5544 set_klass(ik);
5545
5546 debug_only(ik->verify();)
5547 }
5548
5549 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5550 // Decrement the refcount in the old name, since we're clobbering it.
5551 _class_name->decrement_refcount();
5552
5553 _class_name = new_class_name;
5554 // Increment the refcount of the new name.
5555 // Now the ClassFileParser owns this name and will decrement in
5556 // the destructor.
5557 _class_name->increment_refcount();
5558 }
5559
5560 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5561 Symbol* name,
5562 ClassLoaderData* loader_data,
5563 const ClassLoadInfo* cl_info,
5564 Publicity pub_level,
5565 TRAPS) :
5566 _stream(stream),
5567 _class_name(nullptr),
5568 _loader_data(loader_data),
5569 _is_hidden(cl_info->is_hidden()),
5570 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5571 _orig_cp_size(0),
5572 _static_oop_count(0),
5573 _super_klass(),
5574 _cp(nullptr),
5575 _fieldinfo_stream(nullptr),
5576 _fields_status(nullptr),
5577 _methods(nullptr),
5578 _inner_classes(nullptr),
5579 _nest_members(nullptr),
5580 _nest_host(0),
5581 _permitted_subclasses(nullptr),
5582 _loadable_descriptors(nullptr),
5583 _record_components(nullptr),
5584 _local_interfaces(nullptr),
5585 _local_interface_indexes(nullptr),
5586 _transitive_interfaces(nullptr),
5587 _combined_annotations(nullptr),
5588 _class_annotations(nullptr),
5589 _class_type_annotations(nullptr),
5590 _fields_annotations(nullptr),
5591 _fields_type_annotations(nullptr),
5592 _klass(nullptr),
5593 _klass_to_deallocate(nullptr),
5594 _parsed_annotations(nullptr),
5595 _layout_info(nullptr),
5596 _inline_layout_info_array(nullptr),
5597 _temp_field_info(nullptr),
5598 _method_ordering(nullptr),
5599 _all_mirandas(nullptr),
5600 _vtable_size(0),
5601 _itable_size(0),
5602 _num_miranda_methods(0),
5603 _protection_domain(cl_info->protection_domain()),
5604 _access_flags(),
5605 _pub_level(pub_level),
5606 _bad_constant_seen(0),
5607 _synthetic_flag(false),
5608 _sde_length(false),
5609 _sde_buffer(nullptr),
5610 _sourcefile_index(0),
5611 _generic_signature_index(0),
5612 _major_version(0),
5613 _minor_version(0),
5614 _this_class_index(0),
5615 _super_class_index(0),
5616 _itfs_len(0),
5617 _java_fields_count(0),
5618 _need_verify(false),
5619 _has_nonstatic_concrete_methods(false),
5620 _declares_nonstatic_concrete_methods(false),
5621 _has_localvariable_table(false),
5622 _has_final_method(false),
5623 _has_contended_fields(false),
5624 _has_inline_type_fields(false),
5625 _is_naturally_atomic(false),
5626 _must_be_atomic(true),
5627 _is_implicitly_constructible(false),
5628 _has_loosely_consistent_annotation(false),
5629 _has_implicitly_constructible_annotation(false),
5630 _has_finalizer(false),
5631 _has_empty_finalizer(false),
5632 _max_bootstrap_specifier_index(-1) {
5633
5634 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5635 _class_name->increment_refcount();
5636
5637 assert(_loader_data != nullptr, "invariant");
5638 assert(stream != nullptr, "invariant");
5639 assert(_stream != nullptr, "invariant");
5640 assert(_stream->buffer() == _stream->current(), "invariant");
5641 assert(_class_name != nullptr, "invariant");
5642 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5643
5644 // Figure out whether we can skip format checking (matching classic VM behavior)
5645 _need_verify = Verifier::should_verify_for(_loader_data->class_loader());
5646
5647 // synch back verification state to stream to check for truncation.
5648 stream->set_need_verify(_need_verify);
5649
5650 parse_stream(stream, CHECK);
5651
5652 post_process_parsed_stream(stream, _cp, CHECK);
5653 }
5654
5655 void ClassFileParser::clear_class_metadata() {
5656 // metadata created before the instance klass is created. Must be
5657 // deallocated if classfile parsing returns an error.
5658 _cp = nullptr;
5659 _fieldinfo_stream = nullptr;
5660 _fields_status = nullptr;
5661 _methods = nullptr;
5662 _inner_classes = nullptr;
5663 _nest_members = nullptr;
5664 _permitted_subclasses = nullptr;
5665 _loadable_descriptors = nullptr;
5666 _combined_annotations = nullptr;
5667 _class_annotations = _class_type_annotations = nullptr;
5668 _fields_annotations = _fields_type_annotations = nullptr;
5669 _record_components = nullptr;
5670 _inline_layout_info_array = nullptr;
5671 }
5672
5673 // Destructor to clean up
5674 ClassFileParser::~ClassFileParser() {
5675 _class_name->decrement_refcount();
5676
5677 if (_cp != nullptr) {
5678 MetadataFactory::free_metadata(_loader_data, _cp);
5679 }
5680
5681 if (_fieldinfo_stream != nullptr) {
5682 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5683 }
5684
5685 if (_fields_status != nullptr) {
5686 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5687 }
5688
5689 if (_inline_layout_info_array != nullptr) {
5690 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5691 }
5692
5693 if (_methods != nullptr) {
5694 // Free methods
5695 InstanceKlass::deallocate_methods(_loader_data, _methods);
5696 }
5697
5698 // beware of the Universe::empty_blah_array!!
5699 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5700 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5701 }
5702
5703 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5704 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5705 }
5706
5707 if (_record_components != nullptr) {
5708 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5709 }
5710
5711 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5712 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5713 }
5714
5715 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5716 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5717 }
5718
5719 // Free interfaces
5720 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5721 _local_interfaces, _transitive_interfaces);
5722
5723 if (_combined_annotations != nullptr) {
5724 // After all annotations arrays have been created, they are installed into the
5725 // Annotations object that will be assigned to the InstanceKlass being created.
5726
5727 // Deallocate the Annotations object and the installed annotations arrays.
5728 _combined_annotations->deallocate_contents(_loader_data);
5729
5730 // If the _combined_annotations pointer is non-null,
5731 // then the other annotations fields should have been cleared.
5732 assert(_class_annotations == nullptr, "Should have been cleared");
5733 assert(_class_type_annotations == nullptr, "Should have been cleared");
5734 assert(_fields_annotations == nullptr, "Should have been cleared");
5735 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5736 } else {
5737 // If the annotations arrays were not installed into the Annotations object,
5738 // then they have to be deallocated explicitly.
5739 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5740 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5741 Annotations::free_contents(_loader_data, _fields_annotations);
5742 Annotations::free_contents(_loader_data, _fields_type_annotations);
5743 }
5744
5745 clear_class_metadata();
5746 _transitive_interfaces = nullptr;
5747 _local_interfaces = nullptr;
5748
5749 // deallocate the klass if already created. Don't directly deallocate, but add
5750 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5751 // at a safepoint.
5752 if (_klass_to_deallocate != nullptr) {
5753 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5754 }
5755 }
5756
5757 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5758 TRAPS) {
5759
5760 assert(stream != nullptr, "invariant");
5761 assert(_class_name != nullptr, "invariant");
5762
5763 // BEGIN STREAM PARSING
5764 stream->guarantee_more(8, CHECK); // magic, major, minor
5765 // Magic value
5766 const u4 magic = stream->get_u4_fast();
5767 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5768 "Incompatible magic value %u in class file %s",
5769 magic, CHECK);
5770
5771 // Version numbers
5772 _minor_version = stream->get_u2_fast();
5773 _major_version = stream->get_u2_fast();
5774
5775 // Check version numbers - we check this even with verifier off
5776 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5777
5778 stream->guarantee_more(3, CHECK); // length, first cp tag
5779 u2 cp_size = stream->get_u2_fast();
5780
5781 guarantee_property(
5782 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5783 cp_size, CHECK);
5784
5785 _orig_cp_size = cp_size;
5786 if (is_hidden()) { // Add a slot for hidden class name.
5787 cp_size++;
5788 }
5789
5790 _cp = ConstantPool::allocate(_loader_data,
5791 cp_size,
5792 CHECK);
5793
5794 ConstantPool* const cp = _cp;
5795
5796 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5797
5798 assert(cp_size == (u2)cp->length(), "invariant");
5799
5800 // ACCESS FLAGS
5801 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5802
5803 u2 recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
5804 // JVM_ACC_MODULE is defined in JDK-9 and later.
5805 if (_major_version >= JAVA_9_VERSION) {
5806 recognized_modifiers |= JVM_ACC_MODULE;
5807 }
5808
5809 // Access flags
5810 u2 flags = stream->get_u2_fast() & recognized_modifiers;
5811
5812 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5813 // Set abstract bit for old class files for backward compatibility
5814 flags |= JVM_ACC_ABSTRACT;
5815 }
5816
5817 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5818 if (!supports_inline_types()) {
5819 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5820 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5821 if (!is_module && !is_interface) {
5822 flags |= JVM_ACC_IDENTITY;
5823 }
5824 }
5825
5826
5827 // This class and superclass
5828 _this_class_index = stream->get_u2_fast();
5829 guarantee_property(
5830 valid_cp_range(_this_class_index, cp_size) &&
5831 cp->tag_at(_this_class_index).is_unresolved_klass(),
5832 "Invalid this class index %u in constant pool in class file %s",
5833 _this_class_index, CHECK);
5834
5835 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5836 assert(class_name_in_cp != nullptr, "class_name can't be null");
5837
5838 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
5839
5840 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
5841
5842 _access_flags.set_flags(flags);
5843
5844 short bad_constant = class_bad_constant_seen();
5845 if (bad_constant != 0) {
5846 // Do not throw CFE until after the access_flags are checked because if
5847 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5848 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5849 return;
5850 }
5851
5852 // Don't need to check whether this class name is legal or not.
5853 // It has been checked when constant pool is parsed.
5854 // However, make sure it is not an array type.
5855 if (_need_verify) {
5856 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5857 "Bad class name in class file %s",
5858 CHECK);
5859 }
5860
5861 #ifdef ASSERT
5862 // Basic sanity checks
5863 if (_is_hidden) {
5864 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5865 }
5866 #endif
5867
5868 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5869
5870 if (_is_hidden) {
5871 assert(_class_name != nullptr, "Unexpected null _class_name");
5872 #ifdef ASSERT
5873 if (_need_verify) {
5874 verify_legal_class_name(_class_name, CHECK);
5875 }
5876 #endif
5877
5878 } else {
5879 // Check if name in class file matches given name
5880 if (_class_name != class_name_in_cp) {
5881 if (_class_name != vmSymbols::unknown_class_name()) {
5882 ResourceMark rm(THREAD);
5883 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5884 Exceptions::fthrow(THREAD_AND_LOCATION,
5885 vmSymbols::java_lang_NoClassDefFoundError(),
5886 "%s (wrong name: %s)",
5887 _class_name->as_C_string(),
5888 class_name_in_cp->as_C_string()
5889 );
5890 return;
5891 } else {
5892 // The class name was not known by the caller so we set it from
5893 // the value in the CP.
5894 update_class_name(class_name_in_cp);
5895 }
5896 // else nothing to do: the expected class name matches what is in the CP
5897 }
5898 }
5899
5900 // Verification prevents us from creating names with dots in them, this
5901 // asserts that that's the case.
5902 assert(is_internal_format(_class_name), "external class name format used internally");
5903
5904 if (!is_internal()) {
5905 LogTarget(Debug, class, preorder) lt;
5906 if (lt.is_enabled()){
5907 ResourceMark rm(THREAD);
5908 LogStream ls(lt);
5909 ls.print("%s", _class_name->as_klass_external_name());
5910 if (stream->source() != nullptr) {
5911 ls.print(" source: %s", stream->source());
5912 }
5913 ls.cr();
5914 }
5915 }
5916
5917 // SUPERKLASS
5918 _super_class_index = stream->get_u2_fast();
5919 _super_klass = parse_super_class(cp,
5920 _super_class_index,
5921 _need_verify,
5922 CHECK);
5923
5924 // Interfaces
5925 _itfs_len = stream->get_u2_fast();
5926 parse_interfaces(stream,
5927 _itfs_len,
5928 cp,
5929 &_has_nonstatic_concrete_methods,
5930 CHECK);
5931
5932 // Fields (offsets are filled in later)
5933 parse_fields(stream,
5934 _access_flags,
5935 cp,
5936 cp_size,
5937 &_java_fields_count,
5938 CHECK);
5939
5940 assert(_temp_field_info != nullptr, "invariant");
5941
5942 // Methods
5943 parse_methods(stream,
5944 is_interface(),
5945 !is_identity_class(),
5946 is_abstract_class(),
5947 &_has_localvariable_table,
5948 &_has_final_method,
5949 &_declares_nonstatic_concrete_methods,
5950 CHECK);
5951
5952 assert(_methods != nullptr, "invariant");
5953
5954 if (_declares_nonstatic_concrete_methods) {
5955 _has_nonstatic_concrete_methods = true;
5956 }
5957
5958 // Additional attributes/annotations
5959 _parsed_annotations = new ClassAnnotationCollector();
5960 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5961
5962 assert(_inner_classes != nullptr, "invariant");
5963
5964 // Finalize the Annotations metadata object,
5965 // now that all annotation arrays have been created.
5966 create_combined_annotations(CHECK);
5967
5968 // Make sure this is the end of class file stream
5969 guarantee_property(stream->at_eos(),
5970 "Extra bytes at the end of class file %s",
5971 CHECK);
5972
5973 // all bytes in stream read and parsed
5974 }
5975
5976 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5977 ResourceMark rm;
5978 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5979 // use a '/' because that confuses finding the class's package. Also, can't
5980 // use an illegal char such as ';' because that causes serialization issues
5981 // and issues with hidden classes that create their own hidden classes.
5982 char addr_buf[20];
5983 if (CDSConfig::is_dumping_static_archive()) {
5984 // We want stable names for the archived hidden classes (only for static
5985 // archive for now). Spaces under default_SharedBaseAddress() will be
5986 // occupied by the archive at run time, so we know that no dynamically
5987 // loaded InstanceKlass will be placed under there.
5988 static volatile size_t counter = 0;
5989 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5990 size_t new_id = Atomic::add(&counter, (size_t)1);
5991 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
5992 } else {
5993 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5994 }
5995 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5996 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5997 jio_snprintf(new_name, new_name_len, "%s+%s",
5998 _class_name->as_C_string(), addr_buf);
5999 update_class_name(SymbolTable::new_symbol(new_name));
6000
6001 // Add a Utf8 entry containing the hidden name.
6002 assert(_class_name != nullptr, "Unexpected null _class_name");
6003 int hidden_index = _orig_cp_size; // this is an extra slot we added
6004 _cp->symbol_at_put(hidden_index, _class_name);
6005
6006 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6007 // We have to update the resolved_klass_index and the name_index together
6008 // so extract the existing resolved_klass_index first.
6009 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6010 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6011 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6012 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6013 "Bad name_index");
6014 }
6015
6016 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6017 ConstantPool* cp,
6018 TRAPS) {
6019 assert(stream != nullptr, "invariant");
6020 assert(stream->at_eos(), "invariant");
6021 assert(cp != nullptr, "invariant");
6022 assert(_loader_data != nullptr, "invariant");
6023
6024 if (_class_name == vmSymbols::java_lang_Object()) {
6025 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6026 "java.lang.Object cannot implement an interface in class file %s",
6027 CHECK);
6028 }
6029 // We check super class after class file is parsed and format is checked
6030 if (_super_class_index > 0 && nullptr == _super_klass) {
6031 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6032 if (is_interface()) {
6033 // Before attempting to resolve the superclass, check for class format
6034 // errors not checked yet.
6035 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6036 "Interfaces must have java.lang.Object as superclass in class file %s",
6037 CHECK);
6038 }
6039 Handle loader(THREAD, _loader_data->class_loader());
6040 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6041 _super_klass = vmClasses::Object_klass();
6042 } else {
6043 _super_klass = (const InstanceKlass*)
6044 SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6045 super_class_name,
6046 loader,
6047 true,
6048 CHECK);
6049 }
6050 }
6051
6052 if (_super_klass != nullptr) {
6053 if (_super_klass->is_interface()) {
6054 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6055 return;
6056 }
6057
6058 if (_super_klass->is_final()) {
6059 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6060 return;
6061 }
6062
6063 if (EnableValhalla) {
6064 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6065 }
6066
6067 if (_super_klass->has_nonstatic_concrete_methods()) {
6068 _has_nonstatic_concrete_methods = true;
6069 }
6070 }
6071
6072 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6073 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6074 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6075 _class_name->as_klass_external_name()));
6076 }
6077 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_ImplicitlyConstructible) && _access_flags.is_identity_class()) {
6078 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6079 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.ImplicitlyConstructible, because it is not a value class",
6080 _class_name->as_klass_external_name()));
6081 }
6082
6083 // Determining is the class allows tearing or not (default is not)
6084 if (EnableValhalla && !_access_flags.is_identity_class()) {
6085 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6086 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6087 // Conditions above are not sufficient to determine atomicity requirements,
6088 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6089 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6090 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6091 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6092 _must_be_atomic = false;
6093 }
6094 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_ImplicitlyConstructible)
6095 && (_super_klass == vmClasses::Object_klass() || _super_klass == vmClasses::Record_klass()
6096 || _super_klass->is_implicitly_constructible())) {
6097 _is_implicitly_constructible = true;
6098 }
6099 // Apply VM options override
6100 if (*ForceNonTearable != '\0') {
6101 // Allow a command line switch to force the same atomicity property:
6102 const char* class_name_str = _class_name->as_C_string();
6103 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6104 _must_be_atomic = true;
6105 }
6106 }
6107 }
6108
6109 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6110 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6111 if (_local_interface_indexes != nullptr) {
6112 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6113 u2 interface_index = _local_interface_indexes->at(i);
6114 Klass* interf;
6115 if (cp->tag_at(interface_index).is_klass()) {
6116 interf = cp->resolved_klass_at(interface_index);
6117 } else {
6118 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6119
6120 // Don't need to check legal name because it's checked when parsing constant pool.
6121 // But need to make sure it's not an array type.
6122 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6123 "Bad interface name in class file %s", CHECK);
6124
6125 // Call resolve on the interface class name with class circularity checking
6126 interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6127 _class_name,
6128 unresolved_klass,
6129 Handle(THREAD, _loader_data->class_loader()),
6130 false,
6131 CHECK);
6132 }
6133
6134 if (!interf->is_interface()) {
6135 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6136 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6137 _class_name->as_klass_external_name(),
6138 interf->external_name(),
6139 interf->class_in_module_of_loader()));
6140 }
6141
6142 if (EnableValhalla) {
6143 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6144 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6145 }
6146
6147 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6148 _has_nonstatic_concrete_methods = true;
6149 }
6150 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6151 }
6152 }
6153 assert(_local_interfaces != nullptr, "invariant");
6154
6155 // Compute the transitive list of all unique interfaces implemented by this class
6156 _transitive_interfaces =
6157 compute_transitive_interfaces(_super_klass,
6158 _local_interfaces,
6159 _loader_data,
6160 CHECK);
6161
6162 assert(_transitive_interfaces != nullptr, "invariant");
6163
6164 // sort methods
6165 _method_ordering = sort_methods(_methods);
6166
6167 _all_mirandas = new GrowableArray<Method*>(20);
6168
6169 Handle loader(THREAD, _loader_data->class_loader());
6170 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6171 &_num_miranda_methods,
6172 _all_mirandas,
6173 _super_klass,
6174 _methods,
6175 _access_flags,
6176 _major_version,
6177 loader,
6178 _class_name,
6179 _local_interfaces);
6180
6181 // Size of Java itable (in words)
6182 _itable_size = is_interface() ? 0 :
6183 klassItable::compute_itable_size(_transitive_interfaces);
6184
6185 assert(_parsed_annotations != nullptr, "invariant");
6186
6187 if (EnableValhalla) {
6188 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6189 java_fields_count(),
6190 CHECK);
6191 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6192 FieldInfo fieldinfo = *it;
6193 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6194 Symbol* sig = fieldinfo.signature(cp);
6195 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6196 // Pre-load classes of null-free fields that are candidate for flattening
6197 TempNewSymbol s = Signature::strip_envelope(sig);
6198 if (s == _class_name) {
6199 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(), err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6200 }
6201 log_info(class, preload)("Preloading class %s during loading of class %s. Cause: a null-free non-static field is declared with this type", s->as_C_string(), _class_name->as_C_string());
6202 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s, Handle(THREAD, _loader_data->class_loader()), false, THREAD);
6203 if (HAS_PENDING_EXCEPTION) {
6204 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) failed: %s",
6205 s->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6206 return; // Exception is still pending
6207 }
6208 assert(klass != nullptr, "Sanity check");
6209 if (klass->access_flags().is_identity_class()) {
6210 assert(klass->is_instance_klass(), "Sanity check");
6211 ResourceMark rm(THREAD);
6212 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6213 err_msg("Class %s expects class %s to be a value class, but it is an identity class",
6214 _class_name->as_C_string(),
6215 InstanceKlass::cast(klass)->external_name()));
6216 }
6217 if (klass->is_abstract()) {
6218 assert(klass->is_instance_klass(), "Sanity check");
6219 ResourceMark rm(THREAD);
6220 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6221 err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
6222 _class_name->as_C_string(),
6223 InstanceKlass::cast(klass)->external_name()));
6224 }
6225 InlineKlass* vk = InlineKlass::cast(klass);
6226 if (!vk->is_implicitly_constructible()) {
6227 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6228 err_msg("class %s is not implicitly constructible and it is used in a null restricted non-static field (not supported)",
6229 klass->name()->as_C_string()));
6230 }
6231 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6232 log_info(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) succeeded", s->as_C_string(), _class_name->as_C_string());
6233 } else if (Signature::has_envelope(sig)) {
6234 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6235 // Those classes would be required later for the flattening of nullable inline type fields
6236 TempNewSymbol name = Signature::strip_envelope(sig);
6237 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6238 log_info(class, preload)("Preloading class %s during loading of class %s. Cause: field type in LoadableDescriptors attribute", name->as_C_string(), _class_name->as_C_string());
6239 oop loader = loader_data()->class_loader();
6240 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name, Handle(THREAD, loader), false, THREAD);
6241 if (klass != nullptr) {
6242 if (klass->is_inline_klass()) {
6243 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6244 log_info(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) succeeded", name->as_C_string(), _class_name->as_C_string());
6245 } else {
6246 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6247 log_warning(class, preload)("Preloading class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) but loaded class is not a value class", name->as_C_string(), _class_name->as_C_string());
6248 }
6249 } else {
6250 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) failed : %s",
6251 name->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6252 }
6253 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6254 if (HAS_PENDING_EXCEPTION) {
6255 CLEAR_PENDING_EXCEPTION;
6256 }
6257 }
6258 }
6259 }
6260 }
6261
6262 _layout_info = new FieldLayoutInfo();
6263 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6264 _parsed_annotations->is_contended(), is_inline_type(),
6265 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6266 _must_be_atomic, _layout_info, _inline_layout_info_array);
6267 lb.build_layout();
6268 _has_inline_type_fields = _layout_info->_has_inline_fields;
6269
6270 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6271 _fieldinfo_stream =
6272 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6273 injected_fields_count, loader_data(), CHECK);
6274
6275 _fields_status =
6276 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6277 FieldStatus(0), CHECK);
6278 }
6279
6280 void ClassFileParser::set_klass(InstanceKlass* klass) {
6281
6282 #ifdef ASSERT
6283 if (klass != nullptr) {
6284 assert(nullptr == _klass, "leaking?");
6285 }
6286 #endif
6287
6288 _klass = klass;
6289 }
6290
6291 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6292
6293 #ifdef ASSERT
6294 if (klass != nullptr) {
6295 assert(nullptr == _klass_to_deallocate, "leaking?");
6296 }
6297 #endif
6298
6299 _klass_to_deallocate = klass;
6300 }
6301
6302 // Caller responsible for ResourceMark
6303 // clone stream with rewound position
6304 const ClassFileStream* ClassFileParser::clone_stream() const {
6305 assert(_stream != nullptr, "invariant");
6306
6307 return _stream->clone();
6308 }
6309
6310 ReferenceType ClassFileParser::super_reference_type() const {
6311 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6312 }
6313
6314 bool ClassFileParser::is_instance_ref_klass() const {
6315 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6316 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6317 // klass requiring special treatment in ref-processing. The abstract
6318 // j.l.r.Reference cannot be instantiated so doesn't partake in
6319 // ref-processing.
6320 return is_java_lang_ref_Reference_subclass();
6321 }
6322
6323 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6324 if (_super_klass == nullptr) {
6325 return false;
6326 }
6327
6328 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6329 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6330 return true;
6331 }
6332
6333 return _super_klass->reference_type() != REF_NONE;
6334 }
6335
6336 // Returns true if the future Klass will need to be addressable with a narrow Klass ID.
6337 bool ClassFileParser::klass_needs_narrow_id() const {
6338 // Classes that are never instantiated need no narrow Klass Id, since the
6339 // only point of having a narrow id is to put it into an object header. Keeping
6340 // never instantiated classes out of class space lessens the class space pressure.
6341 // For more details, see JDK-8338526.
6342 return !is_interface() && !is_abstract();
6343 }
6344
6345 // ----------------------------------------------------------------------------
6346 // debugging
6347
6348 #ifdef ASSERT
6349
6350 // return true if class_name contains no '.' (internal format is '/')
6351 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6352 if (class_name != nullptr) {
6353 ResourceMark rm;
6354 char* name = class_name->as_C_string();
6355 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6356 } else {
6357 return true;
6358 }
6359 }
6360
6361 #endif