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