1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "oops/inlineKlass.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoadInfo.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/inlineKlass.inline.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/klassVtable.hpp"
60 #include "oops/metadata.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiThreadState.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/fieldDescriptor.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/safepointVerifiers.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/timer.hpp"
77 #include "services/classLoadingService.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/bitMap.inline.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/exceptions.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/resourceHash.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95 #if INCLUDE_JFR
96 #include "jfr/support/jfrTraceIdExtension.hpp"
97 #endif
98
99 // We generally try to create the oops directly when parsing, rather than
100 // allocating temporary data structures and copying the bytes twice. A
101 // temporary area is only needed when parsing utf8 entries in the constant
102 // pool and when parsing line number tables.
103
104 // We add assert in debug mode when class format is not checked.
105
106 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
107 #define JAVA_MIN_SUPPORTED_VERSION 45
108 #define JAVA_PREVIEW_MINOR_VERSION 65535
109
110 // Used for two backward compatibility reasons:
111 // - to check for new additions to the class file format in JDK1.5
112 // - to check for bug fixes in the format checker in JDK1.5
113 #define JAVA_1_5_VERSION 49
114
115 // Used for backward compatibility reasons:
116 // - to check for javac bug fixes that happened after 1.5
117 // - also used as the max version when running in jdk6
118 #define JAVA_6_VERSION 50
119
120 // Used for backward compatibility reasons:
121 // - to disallow argument and require ACC_STATIC for <clinit> methods
122 #define JAVA_7_VERSION 51
123
124 // Extension method support.
125 #define JAVA_8_VERSION 52
126
127 #define JAVA_9_VERSION 53
128
129 #define JAVA_10_VERSION 54
130
131 #define JAVA_11_VERSION 55
132
133 #define JAVA_12_VERSION 56
134
135 #define JAVA_13_VERSION 57
136
137 #define JAVA_14_VERSION 58
138
139 #define JAVA_15_VERSION 59
140
141 #define JAVA_16_VERSION 60
142
143 #define JAVA_17_VERSION 61
144
145 #define JAVA_18_VERSION 62
146
147 #define JAVA_19_VERSION 63
148
149 #define JAVA_20_VERSION 64
150
151 #define JAVA_21_VERSION 65
152
153 #define JAVA_22_VERSION 66
154
155 #define JAVA_23_VERSION 67
156
157 #define CONSTANT_CLASS_DESCRIPTORS 69
158
159 #define JAVA_24_VERSION 68
160
161 #define JAVA_25_VERSION 69
162
163 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
164 assert((bad_constant == JVM_CONSTANT_Module ||
165 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
166 "Unexpected bad constant pool entry");
167 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
168 }
169
170 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
171 ConstantPool* cp,
172 const int length,
173 TRAPS) {
174 assert(stream != nullptr, "invariant");
175 assert(cp != nullptr, "invariant");
176
177 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
178 // this function (_current can be allocated in a register, with scalar
179 // replacement of aggregates). The _current pointer is copied back to
180 // stream() when this function returns. DON'T call another method within
181 // this method that uses stream().
182 const ClassFileStream cfs1 = *stream;
183 const ClassFileStream* const cfs = &cfs1;
184
185 debug_only(const u1* const old_current = stream->current();)
186
187 // Used for batching symbol allocations.
188 const char* names[SymbolTable::symbol_alloc_batch_size];
189 int lengths[SymbolTable::symbol_alloc_batch_size];
190 int indices[SymbolTable::symbol_alloc_batch_size];
191 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
192 int names_count = 0;
193
194 // parsing Index 0 is unused
195 for (int index = 1; index < length; index++) {
196 // Each of the following case guarantees one more byte in the stream
197 // for the following tag or the access_flags following constant pool,
198 // so we don't need bounds-check for reading tag.
199 const u1 tag = cfs->get_u1_fast();
200 switch (tag) {
201 case JVM_CONSTANT_Class: {
202 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
203 const u2 name_index = cfs->get_u2_fast();
204 cp->klass_index_at_put(index, name_index);
205 break;
206 }
207 case JVM_CONSTANT_Fieldref: {
208 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
209 const u2 class_index = cfs->get_u2_fast();
210 const u2 name_and_type_index = cfs->get_u2_fast();
211 cp->field_at_put(index, class_index, name_and_type_index);
212 break;
213 }
214 case JVM_CONSTANT_Methodref: {
215 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
216 const u2 class_index = cfs->get_u2_fast();
217 const u2 name_and_type_index = cfs->get_u2_fast();
218 cp->method_at_put(index, class_index, name_and_type_index);
219 break;
220 }
221 case JVM_CONSTANT_InterfaceMethodref: {
222 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
223 const u2 class_index = cfs->get_u2_fast();
224 const u2 name_and_type_index = cfs->get_u2_fast();
225 cp->interface_method_at_put(index, class_index, name_and_type_index);
226 break;
227 }
228 case JVM_CONSTANT_String : {
229 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
230 const u2 string_index = cfs->get_u2_fast();
231 cp->string_index_at_put(index, string_index);
232 break;
233 }
234 case JVM_CONSTANT_MethodHandle :
235 case JVM_CONSTANT_MethodType: {
236 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
237 classfile_parse_error(
238 "Class file version does not support constant tag %u in class file %s",
239 tag, THREAD);
240 return;
241 }
242 if (tag == JVM_CONSTANT_MethodHandle) {
243 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
244 const u1 ref_kind = cfs->get_u1_fast();
245 const u2 method_index = cfs->get_u2_fast();
246 cp->method_handle_index_at_put(index, ref_kind, method_index);
247 }
248 else if (tag == JVM_CONSTANT_MethodType) {
249 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
250 const u2 signature_index = cfs->get_u2_fast();
251 cp->method_type_index_at_put(index, signature_index);
252 }
253 else {
254 ShouldNotReachHere();
255 }
256 break;
257 }
258 case JVM_CONSTANT_Dynamic : {
259 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
260 classfile_parse_error(
261 "Class file version does not support constant tag %u in class file %s",
262 tag, THREAD);
263 return;
264 }
265 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
266 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
267 const u2 name_and_type_index = cfs->get_u2_fast();
268 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
269 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
270 }
271 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
272 break;
273 }
274 case JVM_CONSTANT_InvokeDynamic : {
275 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
276 classfile_parse_error(
277 "Class file version does not support constant tag %u in class file %s",
278 tag, THREAD);
279 return;
280 }
281 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
282 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
283 const u2 name_and_type_index = cfs->get_u2_fast();
284 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
285 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
286 }
287 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
288 break;
289 }
290 case JVM_CONSTANT_Integer: {
291 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
292 const u4 bytes = cfs->get_u4_fast();
293 cp->int_at_put(index, (jint)bytes);
294 break;
295 }
296 case JVM_CONSTANT_Float: {
297 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
298 const u4 bytes = cfs->get_u4_fast();
299 cp->float_at_put(index, *(jfloat*)&bytes);
300 break;
301 }
302 case JVM_CONSTANT_Long: {
303 // A mangled type might cause you to overrun allocated memory
304 guarantee_property(index + 1 < length,
305 "Invalid constant pool entry %u in class file %s",
306 index,
307 CHECK);
308 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
309 const u8 bytes = cfs->get_u8_fast();
310 cp->long_at_put(index, bytes);
311 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
312 break;
313 }
314 case JVM_CONSTANT_Double: {
315 // A mangled type might cause you to overrun allocated memory
316 guarantee_property(index+1 < length,
317 "Invalid constant pool entry %u in class file %s",
318 index,
319 CHECK);
320 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
321 const u8 bytes = cfs->get_u8_fast();
322 cp->double_at_put(index, *(jdouble*)&bytes);
323 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
324 break;
325 }
326 case JVM_CONSTANT_NameAndType: {
327 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
328 const u2 name_index = cfs->get_u2_fast();
329 const u2 signature_index = cfs->get_u2_fast();
330 cp->name_and_type_at_put(index, name_index, signature_index);
331 break;
332 }
333 case JVM_CONSTANT_Utf8 : {
334 cfs->guarantee_more(2, CHECK); // utf8_length
335 u2 utf8_length = cfs->get_u2_fast();
336 const u1* utf8_buffer = cfs->current();
337 assert(utf8_buffer != nullptr, "null utf8 buffer");
338 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
339 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
340 cfs->skip_u1_fast(utf8_length);
341
342 // Before storing the symbol, make sure it's legal
343 if (_need_verify) {
344 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
345 }
346
347 unsigned int hash;
348 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
349 utf8_length,
350 hash);
351 if (result == nullptr) {
352 names[names_count] = (const char*)utf8_buffer;
353 lengths[names_count] = utf8_length;
354 indices[names_count] = index;
355 hashValues[names_count++] = hash;
356 if (names_count == SymbolTable::symbol_alloc_batch_size) {
357 SymbolTable::new_symbols(_loader_data,
358 constantPoolHandle(THREAD, cp),
359 names_count,
360 names,
361 lengths,
362 indices,
363 hashValues);
364 names_count = 0;
365 }
366 } else {
367 cp->symbol_at_put(index, result);
368 }
369 break;
370 }
371 case JVM_CONSTANT_Module:
372 case JVM_CONSTANT_Package: {
373 // Record that an error occurred in these two cases but keep parsing so
374 // that ACC_Module can be checked for in the access_flags. Need to
375 // throw NoClassDefFoundError in that case.
376 if (_major_version >= JAVA_9_VERSION) {
377 cfs->guarantee_more(3, CHECK);
378 cfs->get_u2_fast();
379 set_class_bad_constant_seen(tag);
380 break;
381 }
382 }
383 default: {
384 classfile_parse_error("Unknown constant tag %u in class file %s",
385 tag,
386 THREAD);
387 return;
388 }
389 } // end of switch(tag)
390 } // end of for
391
392 // Allocate the remaining symbols
393 if (names_count > 0) {
394 SymbolTable::new_symbols(_loader_data,
395 constantPoolHandle(THREAD, cp),
396 names_count,
397 names,
398 lengths,
399 indices,
400 hashValues);
401 }
402
403 // Copy _current pointer of local copy back to stream.
404 assert(stream->current() == old_current, "non-exclusive use of stream");
405 stream->set_current(cfs1.current());
406
407 }
408
409 static inline bool valid_cp_range(int index, int length) {
410 return (index > 0 && index < length);
411 }
412
413 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
414 assert(cp != nullptr, "invariant");
415 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
416 return cp->symbol_at(index);
417 }
418 return nullptr;
419 }
420
421 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
422 ConstantPool* const cp,
423 const int length,
424 TRAPS) {
425 assert(cp != nullptr, "invariant");
426 assert(stream != nullptr, "invariant");
427
428 // parsing constant pool entries
429 parse_constant_pool_entries(stream, cp, length, CHECK);
430 if (class_bad_constant_seen() != 0) {
431 // a bad CP entry has been detected previously so stop parsing and just return.
432 return;
433 }
434
435 int index = 1; // declared outside of loops for portability
436 int num_klasses = 0;
437
438 // first verification pass - validate cross references
439 // and fixup class and string constants
440 for (index = 1; index < length; index++) { // Index 0 is unused
441 const jbyte tag = cp->tag_at(index).value();
442 switch (tag) {
443 case JVM_CONSTANT_Class: {
444 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
445 break;
446 }
447 case JVM_CONSTANT_Fieldref:
448 // fall through
449 case JVM_CONSTANT_Methodref:
450 // fall through
451 case JVM_CONSTANT_InterfaceMethodref: {
452 if (!_need_verify) break;
453 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
454 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
455 guarantee_property(valid_klass_reference_at(klass_ref_index),
456 "Invalid constant pool index %u in class file %s",
457 klass_ref_index, CHECK);
458 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
459 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
460 "Invalid constant pool index %u in class file %s",
461 name_and_type_ref_index, CHECK);
462 break;
463 }
464 case JVM_CONSTANT_String: {
465 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
466 break;
467 }
468 case JVM_CONSTANT_Integer:
469 break;
470 case JVM_CONSTANT_Float:
471 break;
472 case JVM_CONSTANT_Long:
473 case JVM_CONSTANT_Double: {
474 index++;
475 guarantee_property(
476 (index < length && cp->tag_at(index).is_invalid()),
477 "Improper constant pool long/double index %u in class file %s",
478 index, CHECK);
479 break;
480 }
481 case JVM_CONSTANT_NameAndType: {
482 if (!_need_verify) break;
483 const int name_ref_index = cp->name_ref_index_at(index);
484 const int signature_ref_index = cp->signature_ref_index_at(index);
485 guarantee_property(valid_symbol_at(name_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 name_ref_index, CHECK);
488 guarantee_property(valid_symbol_at(signature_ref_index),
489 "Invalid constant pool index %u in class file %s",
490 signature_ref_index, CHECK);
491 break;
492 }
493 case JVM_CONSTANT_Utf8:
494 break;
495 case JVM_CONSTANT_UnresolvedClass: // fall-through
496 case JVM_CONSTANT_UnresolvedClassInError: {
497 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
498 break;
499 }
500 case JVM_CONSTANT_ClassIndex: {
501 const int class_index = cp->klass_index_at(index);
502 guarantee_property(valid_symbol_at(class_index),
503 "Invalid constant pool index %u in class file %s",
504 class_index, CHECK);
505
506 Symbol* const name = cp->symbol_at(class_index);
507 const unsigned int name_len = name->utf8_length();
508 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
509 break;
510 }
511 case JVM_CONSTANT_StringIndex: {
512 const int string_index = cp->string_index_at(index);
513 guarantee_property(valid_symbol_at(string_index),
514 "Invalid constant pool index %u in class file %s",
515 string_index, CHECK);
516 Symbol* const sym = cp->symbol_at(string_index);
517 cp->unresolved_string_at_put(index, sym);
518 break;
519 }
520 case JVM_CONSTANT_MethodHandle: {
521 const int ref_index = cp->method_handle_index_at(index);
522 guarantee_property(valid_cp_range(ref_index, length),
523 "Invalid constant pool index %u in class file %s",
524 ref_index, CHECK);
525 const constantTag tag = cp->tag_at(ref_index);
526 const int ref_kind = cp->method_handle_ref_kind_at(index);
527
528 switch (ref_kind) {
529 case JVM_REF_getField:
530 case JVM_REF_getStatic:
531 case JVM_REF_putField:
532 case JVM_REF_putStatic: {
533 guarantee_property(
534 tag.is_field(),
535 "Invalid constant pool index %u in class file %s (not a field)",
536 ref_index, CHECK);
537 break;
538 }
539 case JVM_REF_invokeVirtual:
540 case JVM_REF_newInvokeSpecial: {
541 guarantee_property(
542 tag.is_method(),
543 "Invalid constant pool index %u in class file %s (not a method)",
544 ref_index, CHECK);
545 break;
546 }
547 case JVM_REF_invokeStatic:
548 case JVM_REF_invokeSpecial: {
549 guarantee_property(
550 tag.is_method() ||
551 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
552 "Invalid constant pool index %u in class file %s (not a method)",
553 ref_index, CHECK);
554 break;
555 }
556 case JVM_REF_invokeInterface: {
557 guarantee_property(
558 tag.is_interface_method(),
559 "Invalid constant pool index %u in class file %s (not an interface method)",
560 ref_index, CHECK);
561 break;
562 }
563 default: {
564 classfile_parse_error(
565 "Bad method handle kind at constant pool index %u in class file %s",
566 index, THREAD);
567 return;
568 }
569 } // switch(refkind)
570 // Keep the ref_index unchanged. It will be indirected at link-time.
571 break;
572 } // case MethodHandle
573 case JVM_CONSTANT_MethodType: {
574 const int ref_index = cp->method_type_index_at(index);
575 guarantee_property(valid_symbol_at(ref_index),
576 "Invalid constant pool index %u in class file %s",
577 ref_index, CHECK);
578 break;
579 }
580 case JVM_CONSTANT_Dynamic: {
581 const int name_and_type_ref_index =
582 cp->bootstrap_name_and_type_ref_index_at(index);
583
584 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
585 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
586 "Invalid constant pool index %u in class file %s",
587 name_and_type_ref_index, CHECK);
588 // bootstrap specifier index must be checked later,
589 // when BootstrapMethods attr is available
590
591 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
592 cp->set_has_dynamic_constant();
593 break;
594 }
595 case JVM_CONSTANT_InvokeDynamic: {
596 const int name_and_type_ref_index =
597 cp->bootstrap_name_and_type_ref_index_at(index);
598
599 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
600 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
601 "Invalid constant pool index %u in class file %s",
602 name_and_type_ref_index, CHECK);
603 // bootstrap specifier index must be checked later,
604 // when BootstrapMethods attr is available
605 break;
606 }
607 default: {
608 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
609 ShouldNotReachHere();
610 break;
611 }
612 } // switch(tag)
613 } // end of for
614
615 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
616
617 if (!_need_verify) {
618 return;
619 }
620
621 // second verification pass - checks the strings are of the right format.
622 // but not yet to the other entries
623 for (index = 1; index < length; index++) {
624 const jbyte tag = cp->tag_at(index).value();
625 switch (tag) {
626 case JVM_CONSTANT_UnresolvedClass: {
627 const Symbol* const class_name = cp->klass_name_at(index);
628 // check the name
629 verify_legal_class_name(class_name, CHECK);
630 break;
631 }
632 case JVM_CONSTANT_NameAndType: {
633 if (_need_verify) {
634 const int sig_index = cp->signature_ref_index_at(index);
635 const int name_index = cp->name_ref_index_at(index);
636 const Symbol* const name = cp->symbol_at(name_index);
637 const Symbol* const sig = cp->symbol_at(sig_index);
638 guarantee_property(sig->utf8_length() != 0,
639 "Illegal zero length constant pool entry at %d in class %s",
640 sig_index, CHECK);
641 guarantee_property(name->utf8_length() != 0,
642 "Illegal zero length constant pool entry at %d in class %s",
643 name_index, CHECK);
644
645 if (Signature::is_method(sig)) {
646 // Format check method name and signature
647 verify_legal_method_name(name, CHECK);
648 verify_legal_method_signature(name, sig, CHECK);
649 } else {
650 // Format check field name and signature
651 verify_legal_field_name(name, CHECK);
652 verify_legal_field_signature(name, sig, CHECK);
653 }
654 }
655 break;
656 }
657 case JVM_CONSTANT_Dynamic: {
658 const int name_and_type_ref_index =
659 cp->uncached_name_and_type_ref_index_at(index);
660 // already verified to be utf8
661 const int name_ref_index =
662 cp->name_ref_index_at(name_and_type_ref_index);
663 // already verified to be utf8
664 const int signature_ref_index =
665 cp->signature_ref_index_at(name_and_type_ref_index);
666 const Symbol* const name = cp->symbol_at(name_ref_index);
667 const Symbol* const signature = cp->symbol_at(signature_ref_index);
668 if (_need_verify) {
669 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
670 // Need only to be sure signature is the right type.
671 if (Signature::is_method(signature)) {
672 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
673 }
674 }
675 break;
676 }
677 case JVM_CONSTANT_InvokeDynamic:
678 case JVM_CONSTANT_Fieldref:
679 case JVM_CONSTANT_Methodref:
680 case JVM_CONSTANT_InterfaceMethodref: {
681 const int name_and_type_ref_index =
682 cp->uncached_name_and_type_ref_index_at(index);
683 // already verified to be utf8
684 const int name_ref_index =
685 cp->name_ref_index_at(name_and_type_ref_index);
686 // already verified to be utf8
687 const int signature_ref_index =
688 cp->signature_ref_index_at(name_and_type_ref_index);
689 const Symbol* const name = cp->symbol_at(name_ref_index);
690 const Symbol* const signature = cp->symbol_at(signature_ref_index);
691 if (tag == JVM_CONSTANT_Fieldref) {
692 if (_need_verify) {
693 // Field name and signature are verified above, when iterating NameAndType_info.
694 // Need only to be sure signature is non-zero length and the right type.
695 if (Signature::is_method(signature)) {
696 throwIllegalSignature("Field", name, signature, CHECK);
697 }
698 }
699 } else {
700 if (_need_verify) {
701 // Method name and signature are individually verified above, when iterating
702 // NameAndType_info. Need to check here that signature is non-zero length and
703 // the right type.
704 if (!Signature::is_method(signature)) {
705 throwIllegalSignature("Method", name, signature, CHECK);
706 }
707 }
708 // If a class method name begins with '<', it must be "<init>" and have void signature.
709 const unsigned int name_len = name->utf8_length();
710 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
711 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
712 if (name != vmSymbols::object_initializer_name()) {
713 classfile_parse_error(
714 "Bad method name at constant pool index %u in class file %s",
715 name_ref_index, THREAD);
716 return;
717 } else if (!Signature::is_void_method(signature)) { // must have void signature.
718 throwIllegalSignature("Method", name, signature, CHECK);
719 }
720 }
721 }
722 break;
723 }
724 case JVM_CONSTANT_MethodHandle: {
725 const int ref_index = cp->method_handle_index_at(index);
726 const int ref_kind = cp->method_handle_ref_kind_at(index);
727 switch (ref_kind) {
728 case JVM_REF_invokeVirtual:
729 case JVM_REF_invokeStatic:
730 case JVM_REF_invokeSpecial:
731 case JVM_REF_newInvokeSpecial: {
732 const int name_and_type_ref_index =
733 cp->uncached_name_and_type_ref_index_at(ref_index);
734 const int name_ref_index =
735 cp->name_ref_index_at(name_and_type_ref_index);
736 const Symbol* const name = cp->symbol_at(name_ref_index);
737
738 if (name != vmSymbols::object_initializer_name()) { // !<init>
739 if (ref_kind == JVM_REF_newInvokeSpecial) {
740 classfile_parse_error(
741 "Bad constructor name at constant pool index %u in class file %s",
742 name_ref_index, THREAD);
743 return;
744 }
745 } else { // <init>
746 // The allowed invocation mode of <init> depends on its signature.
747 // This test corresponds to verify_invoke_instructions in the verifier.
748 const int signature_ref_index =
749 cp->signature_ref_index_at(name_and_type_ref_index);
750 const Symbol* const signature = cp->symbol_at(signature_ref_index);
751 if (signature->is_void_method_signature()
752 && ref_kind == JVM_REF_newInvokeSpecial) {
753 // OK, could be a constructor call
754 } else {
755 classfile_parse_error(
756 "Bad method name at constant pool index %u in class file %s",
757 name_ref_index, THREAD);
758 return;
759 }
760 }
761 break;
762 }
763 // Other ref_kinds are already fully checked in previous pass.
764 } // switch(ref_kind)
765 break;
766 }
767 case JVM_CONSTANT_MethodType: {
768 const Symbol* const no_name = vmSymbols::type_name(); // place holder
769 const Symbol* const signature = cp->method_type_signature_at(index);
770 verify_legal_method_signature(no_name, signature, CHECK);
771 break;
772 }
773 case JVM_CONSTANT_Utf8: {
774 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
775 }
776 } // switch(tag)
777 } // end of for
778 }
779
780 class NameSigHash: public ResourceObj {
781 public:
782 const Symbol* _name; // name
783 const Symbol* _sig; // signature
784
785 static const int HASH_ROW_SIZE = 256;
786
787 NameSigHash(Symbol* name, Symbol* sig) :
788 _name(name),
789 _sig(sig) {}
790
791 static unsigned int hash(NameSigHash const& namesig) {
792 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
793 }
794
795 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
796 return (e0._name == e1._name) &&
797 (e0._sig == e1._sig);
798 }
799 };
800
801 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
802 NameSigHash::HASH_ROW_SIZE,
803 AnyObj::RESOURCE_AREA, mtInternal,
804 &NameSigHash::hash, &NameSigHash::equals>;
805
806 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
807 assert(super_type != nullptr,"Method doesn't support null super type");
808 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
809 && super_type->name() != vmSymbols::java_lang_Object()) {
810 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
811 err_msg("Value type %s has an identity type as supertype",
812 current->class_name()->as_klass_external_name()));
813 }
814 }
815
816 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
817 int itfs_len,
818 ConstantPool* cp,
819 bool* const has_nonstatic_concrete_methods,
820 // FIXME: lots of these functions
821 // declare their parameters as const,
822 // which adds only noise to the code.
823 // Remove the spurious const modifiers.
824 // Many are of the form "const int x"
825 // or "T* const x".
826 TRAPS) {
827 assert(stream != nullptr, "invariant");
828 assert(cp != nullptr, "invariant");
829 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
830
831 if (itfs_len == 0) {
832 _local_interfaces = Universe::the_empty_instance_klass_array();
833
834 } else {
835 assert(itfs_len > 0, "only called for len>0");
836 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
837 int index = 0;
838 for (index = 0; index < itfs_len; index++) {
839 const u2 interface_index = stream->get_u2(CHECK);
840 guarantee_property(
841 valid_klass_reference_at(interface_index),
842 "Interface name has bad constant pool index %u in class file %s",
843 interface_index, CHECK);
844 _local_interface_indexes->at_put_grow(index, interface_index);
845 }
846
847 if (!_need_verify || itfs_len <= 1) {
848 return;
849 }
850
851 // Check if there's any duplicates in interfaces
852 ResourceMark rm(THREAD);
853 // Set containing interface names
854 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
855 for (index = 0; index < itfs_len; index++) {
856 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
857 // If no duplicates, add (name, nullptr) in hashtable interface_names.
858 if (!interface_names->put(interface_name, 0)) {
859 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
860 interface_name->as_C_string(), THREAD);
861 return;
862 }
863 }
864 }
865 }
866
867 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
868 int constantvalue_index,
869 int signature_index,
870 TRAPS) const {
871 // Make sure the constant pool entry is of a type appropriate to this field
872 guarantee_property(
873 (constantvalue_index > 0 &&
874 constantvalue_index < cp->length()),
875 "Bad initial value index %u in ConstantValue attribute in class file %s",
876 constantvalue_index, CHECK);
877
878 const constantTag value_type = cp->tag_at(constantvalue_index);
879 switch(cp->basic_type_for_signature_at(signature_index)) {
880 case T_LONG: {
881 guarantee_property(value_type.is_long(),
882 "Inconsistent constant value type in class file %s",
883 CHECK);
884 break;
885 }
886 case T_FLOAT: {
887 guarantee_property(value_type.is_float(),
888 "Inconsistent constant value type in class file %s",
889 CHECK);
890 break;
891 }
892 case T_DOUBLE: {
893 guarantee_property(value_type.is_double(),
894 "Inconsistent constant value type in class file %s",
895 CHECK);
896 break;
897 }
898 case T_BYTE:
899 case T_CHAR:
900 case T_SHORT:
901 case T_BOOLEAN:
902 case T_INT: {
903 guarantee_property(value_type.is_int(),
904 "Inconsistent constant value type in class file %s",
905 CHECK);
906 break;
907 }
908 case T_OBJECT: {
909 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
910 && value_type.is_string()),
911 "Bad string initial value in class file %s",
912 CHECK);
913 break;
914 }
915 default: {
916 classfile_parse_error("Unable to set initial value %u in class file %s",
917 constantvalue_index,
918 THREAD);
919 }
920 }
921 }
922
923 class AnnotationCollector : public ResourceObj{
924 public:
925 enum Location { _in_field, _in_method, _in_class };
926 enum ID {
927 _unknown = 0,
928 _method_CallerSensitive,
929 _method_ForceInline,
930 _method_DontInline,
931 _method_ChangesCurrentThread,
932 _method_JvmtiHideEvents,
933 _method_JvmtiMountTransition,
934 _method_InjectedProfile,
935 _method_LambdaForm_Compiled,
936 _method_Hidden,
937 _method_Scoped,
938 _method_IntrinsicCandidate,
939 _jdk_internal_vm_annotation_Contended,
940 _field_Stable,
941 _jdk_internal_vm_annotation_ReservedStackAccess,
942 _jdk_internal_ValueBased,
943 _jdk_internal_LooselyConsistentValue,
944 _jdk_internal_NullRestricted,
945 _java_lang_Deprecated,
946 _java_lang_Deprecated_for_removal,
947 _annotation_LIMIT
948 };
949 const Location _location;
950 int _annotations_present;
951 u2 _contended_group;
952
953 AnnotationCollector(Location location)
954 : _location(location), _annotations_present(0), _contended_group(0)
955 {
956 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
957 }
958 // If this annotation name has an ID, report it (or _none).
959 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
960 // Set the annotation name:
961 void set_annotation(ID id) {
962 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
963 _annotations_present |= (int)nth_bit((int)id);
964 }
965
966 void remove_annotation(ID id) {
967 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
968 _annotations_present &= (int)~nth_bit((int)id);
969 }
970
971 // Report if the annotation is present.
972 bool has_any_annotations() const { return _annotations_present != 0; }
973 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
974
975 void set_contended_group(u2 group) { _contended_group = group; }
976 u2 contended_group() const { return _contended_group; }
977
978 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
979
980 void set_stable(bool stable) { set_annotation(_field_Stable); }
981 bool is_stable() const { return has_annotation(_field_Stable); }
982 };
983
984 // This class also doubles as a holder for metadata cleanup.
985 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
986 private:
987 ClassLoaderData* _loader_data;
988 AnnotationArray* _field_annotations;
989 AnnotationArray* _field_type_annotations;
990 public:
991 FieldAnnotationCollector(ClassLoaderData* loader_data) :
992 AnnotationCollector(_in_field),
993 _loader_data(loader_data),
994 _field_annotations(nullptr),
995 _field_type_annotations(nullptr) {}
996 ~FieldAnnotationCollector();
997 void apply_to(FieldInfo* f);
998 AnnotationArray* field_annotations() { return _field_annotations; }
999 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1000
1001 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1002 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1003 };
1004
1005 class MethodAnnotationCollector : public AnnotationCollector{
1006 public:
1007 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1008 void apply_to(const methodHandle& m);
1009 };
1010
1011 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1012 public:
1013 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1014 void apply_to(InstanceKlass* ik);
1015 };
1016
1017
1018 static int skip_annotation_value(const u1*, int, int); // fwd decl
1019
1020 // Safely increment index by val if does not pass limit
1021 #define SAFE_ADD(index, limit, val) \
1022 if (index >= limit - val) return limit; \
1023 index += val;
1024
1025 // Skip an annotation. Return >=limit if there is any problem.
1026 static int skip_annotation(const u1* buffer, int limit, int index) {
1027 assert(buffer != nullptr, "invariant");
1028 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1029 // value := switch (tag:u1) { ... }
1030 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1031 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1032 while (--nmem >= 0 && index < limit) {
1033 SAFE_ADD(index, limit, 2); // skip member
1034 index = skip_annotation_value(buffer, limit, index);
1035 }
1036 return index;
1037 }
1038
1039 // Skip an annotation value. Return >=limit if there is any problem.
1040 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1041 assert(buffer != nullptr, "invariant");
1042
1043 // value := switch (tag:u1) {
1044 // case B, C, I, S, Z, D, F, J, c: con:u2;
1045 // case e: e_class:u2 e_name:u2;
1046 // case s: s_con:u2;
1047 // case [: do(nval:u2) {value};
1048 // case @: annotation;
1049 // case s: s_con:u2;
1050 // }
1051 SAFE_ADD(index, limit, 1); // read tag
1052 const u1 tag = buffer[index - 1];
1053 switch (tag) {
1054 case 'B':
1055 case 'C':
1056 case 'I':
1057 case 'S':
1058 case 'Z':
1059 case 'D':
1060 case 'F':
1061 case 'J':
1062 case 'c':
1063 case 's':
1064 SAFE_ADD(index, limit, 2); // skip con or s_con
1065 break;
1066 case 'e':
1067 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1068 break;
1069 case '[':
1070 {
1071 SAFE_ADD(index, limit, 2); // read nval
1072 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1073 while (--nval >= 0 && index < limit) {
1074 index = skip_annotation_value(buffer, limit, index);
1075 }
1076 }
1077 break;
1078 case '@':
1079 index = skip_annotation(buffer, limit, index);
1080 break;
1081 default:
1082 return limit; // bad tag byte
1083 }
1084 return index;
1085 }
1086
1087 // Sift through annotations, looking for those significant to the VM:
1088 static void parse_annotations(const ConstantPool* const cp,
1089 const u1* buffer, int limit,
1090 AnnotationCollector* coll,
1091 ClassLoaderData* loader_data,
1092 const bool can_access_vm_annotations) {
1093
1094 assert(cp != nullptr, "invariant");
1095 assert(buffer != nullptr, "invariant");
1096 assert(coll != nullptr, "invariant");
1097 assert(loader_data != nullptr, "invariant");
1098
1099 // annotations := do(nann:u2) {annotation}
1100 int index = 2; // read nann
1101 if (index >= limit) return;
1102 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1103 enum { // initial annotation layout
1104 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1105 count_off = 2, // u2 such as 1 (one value)
1106 member_off = 4, // utf8 such as 'value'
1107 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1108 e_tag_val = 'e',
1109 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1110 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1111 e_size = 11, // end of 'e' annotation
1112 c_tag_val = 'c', // payload is type
1113 c_con_off = 7, // utf8 payload, such as 'I'
1114 c_size = 9, // end of 'c' annotation
1115 s_tag_val = 's', // payload is String
1116 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1117 s_size = 9,
1118 b_tag_val = 'Z', // payload is boolean
1119 min_size = 6 // smallest possible size (zero members)
1120 };
1121 // Cannot add min_size to index in case of overflow MAX_INT
1122 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1123 int index0 = index;
1124 index = skip_annotation(buffer, limit, index);
1125 const u1* const abase = buffer + index0;
1126 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1127 const int count = Bytes::get_Java_u2((address)abase + count_off);
1128 const Symbol* const aname = check_symbol_at(cp, atype);
1129 if (aname == nullptr) break; // invalid annotation name
1130 const Symbol* member = nullptr;
1131 if (count >= 1) {
1132 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1133 member = check_symbol_at(cp, member_index);
1134 if (member == nullptr) break; // invalid member name
1135 }
1136
1137 // Here is where parsing particular annotations will take place.
1138 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1139 if (AnnotationCollector::_unknown == id) continue;
1140 coll->set_annotation(id);
1141 if (AnnotationCollector::_java_lang_Deprecated == id) {
1142 // @Deprecated can specify forRemoval=true, which we need
1143 // to record for JFR to use. If the annotation is not well-formed
1144 // then we may not be able to determine that.
1145 const u1* offset = abase + member_off;
1146 // There are only 2 members in @Deprecated.
1147 int n_members = MIN2(count, 2);
1148 for (int i = 0; i < n_members; ++i) {
1149 int member_index = Bytes::get_Java_u2((address)offset);
1150 offset += 2;
1151 member = check_symbol_at(cp, member_index);
1152 if (member == vmSymbols::since() &&
1153 (*((address)offset) == s_tag_val)) {
1154 // Found `since` first so skip over it
1155 offset += 3;
1156 }
1157 else if (member == vmSymbols::for_removal() &&
1158 (*((address)offset) == b_tag_val)) {
1159 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1160 // No guarantee the entry is valid so check it refers to an int in the CP.
1161 if (cp->is_within_bounds(boolean_value_index) &&
1162 cp->tag_at(boolean_value_index).is_int() &&
1163 cp->int_at(boolean_value_index) == 1) {
1164 // forRemoval == true
1165 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1166 }
1167 break; // no need to check further
1168 }
1169 else {
1170 // This @Deprecated annotation is malformed so we don't try to
1171 // determine whether forRemoval is set.
1172 break;
1173 }
1174 }
1175 continue; // proceed to next annotation
1176 }
1177
1178 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1179 // @Contended can optionally specify the contention group.
1180 //
1181 // Contended group defines the equivalence class over the fields:
1182 // the fields within the same contended group are not treated distinct.
1183 // The only exception is default group, which does not incur the
1184 // equivalence. Naturally, contention group for classes is meaningless.
1185 //
1186 // While the contention group is specified as String, annotation
1187 // values are already interned, and we might as well use the constant
1188 // pool index as the group tag.
1189 //
1190 u2 group_index = 0; // default contended group
1191 if (count == 1
1192 && s_size == (index - index0) // match size
1193 && s_tag_val == *(abase + tag_off)
1194 && member == vmSymbols::value_name()) {
1195 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1196 // No guarantee the group_index is valid so check it refers to a
1197 // symbol in the CP.
1198 if (cp->is_within_bounds(group_index) &&
1199 cp->tag_at(group_index).is_utf8()) {
1200 // Seems valid, so check for empty string and reset
1201 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1202 group_index = 0; // default contended group
1203 }
1204 } else {
1205 // Not valid so use the default
1206 group_index = 0;
1207 }
1208 }
1209 coll->set_contended_group(group_index);
1210 continue; // proceed to next annotation
1211 }
1212 }
1213 }
1214
1215
1216 // Parse attributes for a field.
1217 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1218 u2 attributes_count,
1219 bool is_static, u2 signature_index,
1220 u2* const constantvalue_index_addr,
1221 bool* const is_synthetic_addr,
1222 u2* const generic_signature_index_addr,
1223 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1224 TRAPS) {
1225 assert(cfs != nullptr, "invariant");
1226 assert(constantvalue_index_addr != nullptr, "invariant");
1227 assert(is_synthetic_addr != nullptr, "invariant");
1228 assert(generic_signature_index_addr != nullptr, "invariant");
1229 assert(parsed_annotations != nullptr, "invariant");
1230 assert(attributes_count > 0, "attributes_count should be greater than 0");
1231
1232 u2 constantvalue_index = 0;
1233 u2 generic_signature_index = 0;
1234 bool is_synthetic = false;
1235 const u1* runtime_visible_annotations = nullptr;
1236 int runtime_visible_annotations_length = 0;
1237 const u1* runtime_visible_type_annotations = nullptr;
1238 int runtime_visible_type_annotations_length = 0;
1239 bool runtime_invisible_annotations_exists = false;
1240 bool runtime_invisible_type_annotations_exists = false;
1241 const ConstantPool* const cp = _cp;
1242
1243 while (attributes_count--) {
1244 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1245 const u2 attribute_name_index = cfs->get_u2_fast();
1246 const u4 attribute_length = cfs->get_u4_fast();
1247 guarantee_property(valid_symbol_at(attribute_name_index),
1248 "Invalid field attribute index %u in class file %s",
1249 attribute_name_index,
1250 CHECK);
1251
1252 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1253 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1254 // ignore if non-static
1255 if (constantvalue_index != 0) {
1256 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1257 return;
1258 }
1259 guarantee_property(
1260 attribute_length == 2,
1261 "Invalid ConstantValue field attribute length %u in class file %s",
1262 attribute_length, CHECK);
1263
1264 constantvalue_index = cfs->get_u2(CHECK);
1265 if (_need_verify) {
1266 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1267 }
1268 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1269 if (attribute_length != 0) {
1270 classfile_parse_error(
1271 "Invalid Synthetic field attribute length %u in class file %s",
1272 attribute_length, THREAD);
1273 return;
1274 }
1275 is_synthetic = true;
1276 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1277 if (attribute_length != 0) {
1278 classfile_parse_error(
1279 "Invalid Deprecated field attribute length %u in class file %s",
1280 attribute_length, THREAD);
1281 return;
1282 }
1283 } else if (_major_version >= JAVA_1_5_VERSION) {
1284 if (attribute_name == vmSymbols::tag_signature()) {
1285 if (generic_signature_index != 0) {
1286 classfile_parse_error(
1287 "Multiple Signature attributes for field in class file %s", THREAD);
1288 return;
1289 }
1290 if (attribute_length != 2) {
1291 classfile_parse_error(
1292 "Wrong size %u for field's Signature attribute in class file %s",
1293 attribute_length, THREAD);
1294 return;
1295 }
1296 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1297 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1298 if (runtime_visible_annotations != nullptr) {
1299 classfile_parse_error(
1300 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1301 return;
1302 }
1303 runtime_visible_annotations_length = attribute_length;
1304 runtime_visible_annotations = cfs->current();
1305 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1306 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1307 parse_annotations(cp,
1308 runtime_visible_annotations,
1309 runtime_visible_annotations_length,
1310 parsed_annotations,
1311 _loader_data,
1312 _can_access_vm_annotations);
1313 cfs->skip_u1_fast(runtime_visible_annotations_length);
1314 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1315 if (runtime_invisible_annotations_exists) {
1316 classfile_parse_error(
1317 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1318 return;
1319 }
1320 runtime_invisible_annotations_exists = true;
1321 cfs->skip_u1(attribute_length, CHECK);
1322 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1323 if (runtime_visible_type_annotations != nullptr) {
1324 classfile_parse_error(
1325 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1326 return;
1327 }
1328 runtime_visible_type_annotations_length = attribute_length;
1329 runtime_visible_type_annotations = cfs->current();
1330 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1331 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1332 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1333 if (runtime_invisible_type_annotations_exists) {
1334 classfile_parse_error(
1335 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1336 return;
1337 } else {
1338 runtime_invisible_type_annotations_exists = true;
1339 }
1340 cfs->skip_u1(attribute_length, CHECK);
1341 } else {
1342 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1343 }
1344 } else {
1345 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1346 }
1347 }
1348
1349 *constantvalue_index_addr = constantvalue_index;
1350 *is_synthetic_addr = is_synthetic;
1351 *generic_signature_index_addr = generic_signature_index;
1352 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1353 runtime_visible_annotations_length,
1354 CHECK);
1355 parsed_annotations->set_field_annotations(a);
1356 a = allocate_annotations(runtime_visible_type_annotations,
1357 runtime_visible_type_annotations_length,
1358 CHECK);
1359 parsed_annotations->set_field_type_annotations(a);
1360 return;
1361 }
1362
1363
1364 // Side-effects: populates the _fields, _fields_annotations,
1365 // _fields_type_annotations fields
1366 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1367 AccessFlags class_access_flags,
1368 ConstantPool* cp,
1369 const int cp_size,
1370 u2* const java_fields_count_ptr,
1371 TRAPS) {
1372
1373 assert(cfs != nullptr, "invariant");
1374 assert(cp != nullptr, "invariant");
1375 assert(java_fields_count_ptr != nullptr, "invariant");
1376
1377 assert(nullptr == _fields_annotations, "invariant");
1378 assert(nullptr == _fields_type_annotations, "invariant");
1379
1380 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1381 cfs->guarantee_more(2, CHECK); // length
1382 const u2 length = cfs->get_u2_fast();
1383 *java_fields_count_ptr = length;
1384
1385 int num_injected = 0;
1386 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1387 &num_injected);
1388
1389 // two more slots are required for inline classes:
1390 // one for the static field with a reference to the pre-allocated default value
1391 // one for the field the JVM injects when detecting an empty inline class
1392 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1393
1394 // Allocate a temporary resource array to collect field data.
1395 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1396 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1397
1398 int instance_fields_count = 0;
1399 ResourceMark rm(THREAD);
1400 for (int n = 0; n < length; n++) {
1401 // access_flags, name_index, descriptor_index, attributes_count
1402 cfs->guarantee_more(8, CHECK);
1403
1404 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1405 if (!supports_inline_types()) {
1406 recognized_modifiers &= ~JVM_ACC_STRICT;
1407 }
1408
1409 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1410 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1411 AccessFlags access_flags;
1412 access_flags.set_flags(flags);
1413 FieldInfo::FieldFlags fieldFlags(0);
1414
1415 const u2 name_index = cfs->get_u2_fast();
1416 guarantee_property(valid_symbol_at(name_index),
1417 "Invalid constant pool index %u for field name in class file %s",
1418 name_index, CHECK);
1419 const Symbol* const name = cp->symbol_at(name_index);
1420 verify_legal_field_name(name, CHECK);
1421
1422 const u2 signature_index = cfs->get_u2_fast();
1423 guarantee_property(valid_symbol_at(signature_index),
1424 "Invalid constant pool index %u for field signature in class file %s",
1425 signature_index, CHECK);
1426 const Symbol* const sig = cp->symbol_at(signature_index);
1427 verify_legal_field_signature(name, sig, CHECK);
1428 if (!access_flags.is_static()) instance_fields_count++;
1429
1430 u2 constantvalue_index = 0;
1431 bool is_synthetic = false;
1432 u2 generic_signature_index = 0;
1433 const bool is_static = access_flags.is_static();
1434 FieldAnnotationCollector parsed_annotations(_loader_data);
1435
1436 bool is_null_restricted = false;
1437
1438 const u2 attributes_count = cfs->get_u2_fast();
1439 if (attributes_count > 0) {
1440 parse_field_attributes(cfs,
1441 attributes_count,
1442 is_static,
1443 signature_index,
1444 &constantvalue_index,
1445 &is_synthetic,
1446 &generic_signature_index,
1447 &parsed_annotations,
1448 CHECK);
1449
1450 if (parsed_annotations.field_annotations() != nullptr) {
1451 if (_fields_annotations == nullptr) {
1452 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1453 _loader_data, length, nullptr,
1454 CHECK);
1455 }
1456 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1457 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1458 if (!Signature::has_envelope(sig)) {
1459 Exceptions::fthrow(
1460 THREAD_AND_LOCATION,
1461 vmSymbols::java_lang_ClassFormatError(),
1462 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1463 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1464 }
1465 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
1466 if (!is_strict) {
1467 Exceptions::fthrow(
1468 THREAD_AND_LOCATION,
1469 vmSymbols::java_lang_ClassFormatError(),
1470 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s which doesn't have the @jdk.internal.vm.annotation.Strict annotation",
1471 class_name()->as_C_string(), name->as_C_string());
1472 }
1473 is_null_restricted = true;
1474 }
1475 parsed_annotations.set_field_annotations(nullptr);
1476 }
1477 if (parsed_annotations.field_type_annotations() != nullptr) {
1478 if (_fields_type_annotations == nullptr) {
1479 _fields_type_annotations =
1480 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1481 length,
1482 nullptr,
1483 CHECK);
1484 }
1485 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1486 parsed_annotations.set_field_type_annotations(nullptr);
1487 }
1488
1489 if (is_synthetic) {
1490 access_flags.set_is_synthetic();
1491 }
1492 if (generic_signature_index != 0) {
1493 fieldFlags.update_generic(true);
1494 }
1495 }
1496
1497 if (is_null_restricted) {
1498 fieldFlags.update_null_free_inline_type(true);
1499 }
1500
1501 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1502
1503 // Update number of static oop fields.
1504 if (is_static && is_reference_type(type)) {
1505 _static_oop_count++;
1506 }
1507
1508 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1509 fi.set_index(n);
1510 if (fieldFlags.is_generic()) {
1511 fi.set_generic_signature_index(generic_signature_index);
1512 }
1513 parsed_annotations.apply_to(&fi);
1514 if (fi.field_flags().is_contended()) {
1515 _has_contended_fields = true;
1516 }
1517 _temp_field_info->append(fi);
1518 }
1519 assert(_temp_field_info->length() == length, "Must be");
1520
1521 if (num_injected != 0) {
1522 for (int n = 0; n < num_injected; n++) {
1523 // Check for duplicates
1524 if (injected[n].may_be_java) {
1525 const Symbol* const name = injected[n].name();
1526 const Symbol* const signature = injected[n].signature();
1527 bool duplicate = false;
1528 for (int i = 0; i < length; i++) {
1529 const FieldInfo* const f = _temp_field_info->adr_at(i);
1530 if (name == cp->symbol_at(f->name_index()) &&
1531 signature == cp->symbol_at(f->signature_index())) {
1532 // Symbol is desclared in Java so skip this one
1533 duplicate = true;
1534 break;
1535 }
1536 }
1537 if (duplicate) {
1538 // These will be removed from the field array at the end
1539 continue;
1540 }
1541 }
1542
1543 // Injected field
1544 FieldInfo::FieldFlags fflags(0);
1545 fflags.update_injected(true);
1546 AccessFlags aflags;
1547 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1548 int idx = _temp_field_info->append(fi);
1549 _temp_field_info->adr_at(idx)->set_index(idx);
1550 }
1551 }
1552
1553 if (is_inline_type) {
1554 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1555 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1556 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1557 // alive.
1558 FieldInfo::FieldFlags fflags2(0);
1559 fflags2.update_injected(true);
1560 AccessFlags aflags2(JVM_ACC_STATIC);
1561 FieldInfo fi2(aflags2,
1562 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1563 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1564 0,
1565 fflags2);
1566 int idx2 = _temp_field_info->append(fi2);
1567 _temp_field_info->adr_at(idx2)->set_index(idx2);
1568 _static_oop_count++;
1569 }
1570
1571 if (_need_verify && length > 1) {
1572 // Check duplicated fields
1573 ResourceMark rm(THREAD);
1574 // Set containing name-signature pairs
1575 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1576 for (int i = 0; i < _temp_field_info->length(); i++) {
1577 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1578 _temp_field_info->adr_at(i)->signature(_cp));
1579 // If no duplicates, add name/signature in hashtable names_and_sigs.
1580 if(!names_and_sigs->put(name_and_sig, 0)) {
1581 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1582 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1583 return;
1584 }
1585 }
1586 }
1587 }
1588
1589
1590 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1591 u4 code_length,
1592 u4 exception_table_length,
1593 TRAPS) {
1594 assert(cfs != nullptr, "invariant");
1595
1596 const unsafe_u2* const exception_table_start = cfs->current();
1597 assert(exception_table_start != nullptr, "null exception table");
1598
1599 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1600 // end_pc,
1601 // handler_pc,
1602 // catch_type_index
1603
1604 // Will check legal target after parsing code array in verifier.
1605 if (_need_verify) {
1606 for (unsigned int i = 0; i < exception_table_length; i++) {
1607 const u2 start_pc = cfs->get_u2_fast();
1608 const u2 end_pc = cfs->get_u2_fast();
1609 const u2 handler_pc = cfs->get_u2_fast();
1610 const u2 catch_type_index = cfs->get_u2_fast();
1611 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1612 "Illegal exception table range in class file %s",
1613 CHECK_NULL);
1614 guarantee_property(handler_pc < code_length,
1615 "Illegal exception table handler in class file %s",
1616 CHECK_NULL);
1617 if (catch_type_index != 0) {
1618 guarantee_property(valid_klass_reference_at(catch_type_index),
1619 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1620 }
1621 }
1622 } else {
1623 cfs->skip_u2_fast(exception_table_length * 4);
1624 }
1625 return exception_table_start;
1626 }
1627
1628 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1629 u4 code_length,
1630 CompressedLineNumberWriteStream**const write_stream,
1631 TRAPS) {
1632
1633 const ClassFileStream* const cfs = _stream;
1634 unsigned int num_entries = cfs->get_u2(CHECK);
1635
1636 // Each entry is a u2 start_pc, and a u2 line_number
1637 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1638
1639 // Verify line number attribute and table length
1640 guarantee_property(
1641 code_attribute_length == sizeof(u2) + length_in_bytes,
1642 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1643
1644 cfs->guarantee_more(length_in_bytes, CHECK);
1645
1646 if ((*write_stream) == nullptr) {
1647 if (length_in_bytes > fixed_buffer_size) {
1648 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1649 } else {
1650 (*write_stream) = new CompressedLineNumberWriteStream(
1651 _linenumbertable_buffer, fixed_buffer_size);
1652 }
1653 }
1654
1655 while (num_entries-- > 0) {
1656 const u2 bci = cfs->get_u2_fast(); // start_pc
1657 const u2 line = cfs->get_u2_fast(); // line_number
1658 guarantee_property(bci < code_length,
1659 "Invalid pc in LineNumberTable in class file %s", CHECK);
1660 (*write_stream)->write_pair(bci, line);
1661 }
1662 }
1663
1664
1665 class LVT_Hash : public AllStatic {
1666 public:
1667
1668 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1669 /*
1670 * 3-tuple start_bci/length/slot has to be unique key,
1671 * so the following comparison seems to be redundant:
1672 * && elem->name_cp_index == entry->_elem->name_cp_index
1673 */
1674 return (e0.start_bci == e1.start_bci &&
1675 e0.length == e1.length &&
1676 e0.name_cp_index == e1.name_cp_index &&
1677 e0.slot == e1.slot);
1678 }
1679
1680 static unsigned int hash(LocalVariableTableElement const& e0) {
1681 unsigned int raw_hash = e0.start_bci;
1682
1683 raw_hash = e0.length + raw_hash * 37;
1684 raw_hash = e0.name_cp_index + raw_hash * 37;
1685 raw_hash = e0.slot + raw_hash * 37;
1686
1687 return raw_hash;
1688 }
1689 };
1690
1691
1692 // Class file LocalVariableTable elements.
1693 class Classfile_LVT_Element {
1694 public:
1695 u2 start_bci;
1696 u2 length;
1697 u2 name_cp_index;
1698 u2 descriptor_cp_index;
1699 u2 slot;
1700 };
1701
1702 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1703 LocalVariableTableElement* const lvt) {
1704 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1705 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1706 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1707 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1708 lvt->signature_cp_index = 0;
1709 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1710 }
1711
1712 // Function is used to parse both attributes:
1713 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1714 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1715 u4 code_length,
1716 u2 max_locals,
1717 u4 code_attribute_length,
1718 u2* const localvariable_table_length,
1719 bool isLVTT,
1720 TRAPS) {
1721 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1722 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1723 const unsigned int size = checked_cast<unsigned>(
1724 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1725
1726 const ConstantPool* const cp = _cp;
1727
1728 // Verify local variable table attribute has right length
1729 if (_need_verify) {
1730 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1731 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1732 }
1733
1734 const unsafe_u2* const localvariable_table_start = cfs->current();
1735 assert(localvariable_table_start != nullptr, "null local variable table");
1736 if (!_need_verify) {
1737 cfs->skip_u2_fast(size);
1738 } else {
1739 cfs->guarantee_more(size * 2, CHECK_NULL);
1740 for(int i = 0; i < (*localvariable_table_length); i++) {
1741 const u2 start_pc = cfs->get_u2_fast();
1742 const u2 length = cfs->get_u2_fast();
1743 const u2 name_index = cfs->get_u2_fast();
1744 const u2 descriptor_index = cfs->get_u2_fast();
1745 const u2 index = cfs->get_u2_fast();
1746 // Assign to a u4 to avoid overflow
1747 const u4 end_pc = (u4)start_pc + (u4)length;
1748
1749 if (start_pc >= code_length) {
1750 classfile_parse_error(
1751 "Invalid start_pc %u in %s in class file %s",
1752 start_pc, tbl_name, THREAD);
1753 return nullptr;
1754 }
1755 if (end_pc > code_length) {
1756 classfile_parse_error(
1757 "Invalid length %u in %s in class file %s",
1758 length, tbl_name, THREAD);
1759 return nullptr;
1760 }
1761 const int cp_size = cp->length();
1762 guarantee_property(valid_symbol_at(name_index),
1763 "Name index %u in %s has bad constant type in class file %s",
1764 name_index, tbl_name, CHECK_NULL);
1765 guarantee_property(valid_symbol_at(descriptor_index),
1766 "Signature index %u in %s has bad constant type in class file %s",
1767 descriptor_index, tbl_name, CHECK_NULL);
1768
1769 const Symbol* const name = cp->symbol_at(name_index);
1770 const Symbol* const sig = cp->symbol_at(descriptor_index);
1771 verify_legal_field_name(name, CHECK_NULL);
1772 u2 extra_slot = 0;
1773 if (!isLVTT) {
1774 verify_legal_field_signature(name, sig, CHECK_NULL);
1775
1776 // 4894874: check special cases for double and long local variables
1777 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1778 sig == vmSymbols::type_signature(T_LONG)) {
1779 extra_slot = 1;
1780 }
1781 }
1782 guarantee_property((index + extra_slot) < max_locals,
1783 "Invalid index %u in %s in class file %s",
1784 index, tbl_name, CHECK_NULL);
1785 }
1786 }
1787 return localvariable_table_start;
1788 }
1789
1790 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1791 u4 code_attribute_length,
1792 TRAPS) {
1793 assert(cfs != nullptr, "invariant");
1794
1795 if (0 == code_attribute_length) {
1796 return nullptr;
1797 }
1798
1799 const u1* const stackmap_table_start = cfs->current();
1800 assert(stackmap_table_start != nullptr, "null stackmap table");
1801
1802 // check code_attribute_length
1803 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1804
1805 return stackmap_table_start;
1806 }
1807
1808 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1809 u2* const checked_exceptions_length,
1810 u4 method_attribute_length,
1811 TRAPS) {
1812 assert(cfs != nullptr, "invariant");
1813 assert(checked_exceptions_length != nullptr, "invariant");
1814
1815 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1816 *checked_exceptions_length = cfs->get_u2_fast();
1817 const unsigned int size =
1818 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1819 const unsafe_u2* const checked_exceptions_start = cfs->current();
1820 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1821 if (!_need_verify) {
1822 cfs->skip_u2_fast(size);
1823 } else {
1824 // Verify each value in the checked exception table
1825 u2 checked_exception;
1826 const u2 len = *checked_exceptions_length;
1827 cfs->guarantee_more(2 * len, CHECK_NULL);
1828 for (int i = 0; i < len; i++) {
1829 checked_exception = cfs->get_u2_fast();
1830 guarantee_property(
1831 valid_klass_reference_at(checked_exception),
1832 "Exception name has bad type at constant pool %u in class file %s",
1833 checked_exception, CHECK_NULL);
1834 }
1835 }
1836 // check exceptions attribute length
1837 if (_need_verify) {
1838 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1839 sizeof(u2) * size),
1840 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1841 }
1842 return checked_exceptions_start;
1843 }
1844
1845 void ClassFileParser::throwIllegalSignature(const char* type,
1846 const Symbol* name,
1847 const Symbol* sig,
1848 TRAPS) const {
1849 assert(name != nullptr, "invariant");
1850 assert(sig != nullptr, "invariant");
1851
1852 ResourceMark rm(THREAD);
1853 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1854 Exceptions::fthrow(THREAD_AND_LOCATION,
1855 vmSymbols::java_lang_ClassFormatError(),
1856 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1857 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1858 }
1859
1860 AnnotationCollector::ID
1861 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1862 const Symbol* name,
1863 const bool can_access_vm_annotations) {
1864 const vmSymbolID sid = vmSymbols::find_sid(name);
1865 // Privileged code can use all annotations. Other code silently drops some.
1866 const bool privileged = loader_data->is_boot_class_loader_data() ||
1867 loader_data->is_platform_class_loader_data() ||
1868 can_access_vm_annotations;
1869 switch (sid) {
1870 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1871 if (_location != _in_method) break; // only allow for methods
1872 if (!privileged) break; // only allow in privileged code
1873 return _method_CallerSensitive;
1874 }
1875 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1876 if (_location != _in_method) break; // only allow for methods
1877 if (!privileged) break; // only allow in privileged code
1878 return _method_ForceInline;
1879 }
1880 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1881 if (_location != _in_method) break; // only allow for methods
1882 if (!privileged) break; // only allow in privileged code
1883 return _method_DontInline;
1884 }
1885 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1886 if (_location != _in_method) break; // only allow for methods
1887 if (!privileged) break; // only allow in privileged code
1888 return _method_ChangesCurrentThread;
1889 }
1890 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1891 if (_location != _in_method) break; // only allow for methods
1892 if (!privileged) break; // only allow in privileged code
1893 return _method_JvmtiHideEvents;
1894 }
1895 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1896 if (_location != _in_method) break; // only allow for methods
1897 if (!privileged) break; // only allow in privileged code
1898 return _method_JvmtiMountTransition;
1899 }
1900 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1901 if (_location != _in_method) break; // only allow for methods
1902 if (!privileged) break; // only allow in privileged code
1903 return _method_InjectedProfile;
1904 }
1905 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1906 if (_location != _in_method) break; // only allow for methods
1907 if (!privileged) break; // only allow in privileged code
1908 return _method_LambdaForm_Compiled;
1909 }
1910 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1911 if (_location != _in_method) break; // only allow for methods
1912 if (!privileged) break; // only allow in privileged code
1913 return _method_Hidden;
1914 }
1915 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1916 if (_location != _in_method) break; // only allow for methods
1917 if (!privileged) break; // only allow in privileged code
1918 return _method_Scoped;
1919 }
1920 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1921 if (_location != _in_method) break; // only allow for methods
1922 if (!privileged) break; // only allow in privileged code
1923 return _method_IntrinsicCandidate;
1924 }
1925 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1926 if (_location != _in_field) break; // only allow for fields
1927 if (!privileged) break; // only allow in privileged code
1928 return _field_Stable;
1929 }
1930 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1931 if (_location != _in_field && _location != _in_class) {
1932 break; // only allow for fields and classes
1933 }
1934 if (!EnableContended || (RestrictContended && !privileged)) {
1935 break; // honor privileges
1936 }
1937 return _jdk_internal_vm_annotation_Contended;
1938 }
1939 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1940 if (_location != _in_method) break; // only allow for methods
1941 if (RestrictReservedStack && !privileged) break; // honor privileges
1942 return _jdk_internal_vm_annotation_ReservedStackAccess;
1943 }
1944 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1945 if (_location != _in_class) break; // only allow for classes
1946 if (!privileged) break; // only allow in privileged code
1947 return _jdk_internal_ValueBased;
1948 }
1949 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1950 if (_location != _in_class) break; // only allow for classes
1951 return _jdk_internal_LooselyConsistentValue;
1952 }
1953 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1954 if (_location != _in_field) break; // only allow for fields
1955 return _jdk_internal_NullRestricted;
1956 }
1957 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1958 return _java_lang_Deprecated;
1959 }
1960 default: {
1961 break;
1962 }
1963 }
1964 return AnnotationCollector::_unknown;
1965 }
1966
1967 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1968 if (is_contended())
1969 // Setting the contended group also sets the contended bit in field flags
1970 f->set_contended_group(contended_group());
1971 if (is_stable())
1972 (f->field_flags_addr())->update_stable(true);
1973 }
1974
1975 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1976 // If there's an error deallocate metadata for field annotations
1977 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1978 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1979 }
1980
1981 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1982 if (has_annotation(_method_CallerSensitive))
1983 m->set_caller_sensitive();
1984 if (has_annotation(_method_ForceInline))
1985 m->set_force_inline();
1986 if (has_annotation(_method_DontInline))
1987 m->set_dont_inline();
1988 if (has_annotation(_method_ChangesCurrentThread))
1989 m->set_changes_current_thread();
1990 if (has_annotation(_method_JvmtiHideEvents))
1991 m->set_jvmti_hide_events();
1992 if (has_annotation(_method_JvmtiMountTransition))
1993 m->set_jvmti_mount_transition();
1994 if (has_annotation(_method_InjectedProfile))
1995 m->set_has_injected_profile();
1996 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1997 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1998 if (has_annotation(_method_Hidden))
1999 m->set_is_hidden();
2000 if (has_annotation(_method_Scoped))
2001 m->set_scoped();
2002 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2003 m->set_intrinsic_candidate();
2004 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2005 m->set_has_reserved_stack_access();
2006 if (has_annotation(_java_lang_Deprecated))
2007 m->set_deprecated();
2008 if (has_annotation(_java_lang_Deprecated_for_removal))
2009 m->set_deprecated_for_removal();
2010 }
2011
2012 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2013 assert(ik != nullptr, "invariant");
2014 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2015 ik->set_is_contended(is_contended());
2016 }
2017 if (has_annotation(_jdk_internal_ValueBased)) {
2018 ik->set_has_value_based_class_annotation();
2019 if (DiagnoseSyncOnValueBasedClasses) {
2020 ik->set_is_value_based();
2021 }
2022 }
2023 if (has_annotation(_java_lang_Deprecated)) {
2024 Array<Method*>* methods = ik->methods();
2025 int length = ik->methods()->length();
2026 for (int i = 0; i < length; i++) {
2027 Method* m = methods->at(i);
2028 m->set_deprecated();
2029 }
2030 }
2031 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2032 Array<Method*>* methods = ik->methods();
2033 int length = ik->methods()->length();
2034 for (int i = 0; i < length; i++) {
2035 Method* m = methods->at(i);
2036 m->set_deprecated_for_removal();
2037 }
2038 }
2039 }
2040
2041 #define MAX_ARGS_SIZE 255
2042 #define MAX_CODE_SIZE 65535
2043 #define INITIAL_MAX_LVT_NUMBER 256
2044
2045 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2046 *
2047 * Rules for LVT's and LVTT's are:
2048 * - There can be any number of LVT's and LVTT's.
2049 * - If there are n LVT's, it is the same as if there was just
2050 * one LVT containing all the entries from the n LVT's.
2051 * - There may be no more than one LVT entry per local variable.
2052 * Two LVT entries are 'equal' if these fields are the same:
2053 * start_pc, length, name, slot
2054 * - There may be no more than one LVTT entry per each LVT entry.
2055 * Each LVTT entry has to match some LVT entry.
2056 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2057 */
2058 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2059 int lvt_cnt,
2060 u2* const localvariable_table_length,
2061 const unsafe_u2** const localvariable_table_start,
2062 int lvtt_cnt,
2063 u2* const localvariable_type_table_length,
2064 const unsafe_u2** const localvariable_type_table_start,
2065 TRAPS) {
2066
2067 ResourceMark rm(THREAD);
2068
2069 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2070 256, AnyObj::RESOURCE_AREA, mtInternal,
2071 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2072
2073 LVT_HashTable* const table = new LVT_HashTable();
2074
2075 // To fill LocalVariableTable in
2076 const Classfile_LVT_Element* cf_lvt;
2077 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2078
2079 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2080 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2081 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2082 copy_lvt_element(&cf_lvt[idx], lvt);
2083 // If no duplicates, add LVT elem in hashtable.
2084 if (table->put(*lvt, lvt) == false
2085 && _need_verify
2086 && _major_version >= JAVA_1_5_VERSION) {
2087 classfile_parse_error("Duplicated LocalVariableTable attribute "
2088 "entry for '%s' in class file %s",
2089 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2090 THREAD);
2091 return;
2092 }
2093 }
2094 }
2095
2096 // To merge LocalVariableTable and LocalVariableTypeTable
2097 const Classfile_LVT_Element* cf_lvtt;
2098 LocalVariableTableElement lvtt_elem;
2099
2100 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2101 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2102 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2103 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2104 LocalVariableTableElement** entry = table->get(lvtt_elem);
2105 if (entry == nullptr) {
2106 if (_need_verify) {
2107 classfile_parse_error("LVTT entry for '%s' in class file %s "
2108 "does not match any LVT entry",
2109 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2110 THREAD);
2111 return;
2112 }
2113 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2114 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2115 "entry for '%s' in class file %s",
2116 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2117 THREAD);
2118 return;
2119 } else {
2120 // to add generic signatures into LocalVariableTable
2121 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2122 }
2123 }
2124 }
2125 }
2126
2127
2128 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2129 const u1* runtime_visible_annotations,
2130 int runtime_visible_annotations_length,
2131 const u1* runtime_visible_parameter_annotations,
2132 int runtime_visible_parameter_annotations_length,
2133 const u1* runtime_visible_type_annotations,
2134 int runtime_visible_type_annotations_length,
2135 const u1* annotation_default,
2136 int annotation_default_length,
2137 TRAPS) {
2138
2139 AnnotationArray* a;
2140
2141 if (runtime_visible_annotations_length > 0) {
2142 a = allocate_annotations(runtime_visible_annotations,
2143 runtime_visible_annotations_length,
2144 CHECK);
2145 cm->set_method_annotations(a);
2146 }
2147
2148 if (runtime_visible_parameter_annotations_length > 0) {
2149 a = allocate_annotations(runtime_visible_parameter_annotations,
2150 runtime_visible_parameter_annotations_length,
2151 CHECK);
2152 cm->set_parameter_annotations(a);
2153 }
2154
2155 if (annotation_default_length > 0) {
2156 a = allocate_annotations(annotation_default,
2157 annotation_default_length,
2158 CHECK);
2159 cm->set_default_annotations(a);
2160 }
2161
2162 if (runtime_visible_type_annotations_length > 0) {
2163 a = allocate_annotations(runtime_visible_type_annotations,
2164 runtime_visible_type_annotations_length,
2165 CHECK);
2166 cm->set_type_annotations(a);
2167 }
2168 }
2169
2170
2171 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2172 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2173 // Method* to save footprint, so we only know the size of the resulting Method* when the
2174 // entire method attribute is parsed.
2175 //
2176 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2177
2178 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2179 bool is_interface,
2180 bool is_value_class,
2181 bool is_abstract_class,
2182 const ConstantPool* cp,
2183 bool* const has_localvariable_table,
2184 TRAPS) {
2185 assert(cfs != nullptr, "invariant");
2186 assert(cp != nullptr, "invariant");
2187 assert(has_localvariable_table != nullptr, "invariant");
2188
2189 ResourceMark rm(THREAD);
2190 // Parse fixed parts:
2191 // access_flags, name_index, descriptor_index, attributes_count
2192 cfs->guarantee_more(8, CHECK_NULL);
2193
2194 u2 flags = cfs->get_u2_fast();
2195 const u2 name_index = cfs->get_u2_fast();
2196 const int cp_size = cp->length();
2197 guarantee_property(
2198 valid_symbol_at(name_index),
2199 "Illegal constant pool index %u for method name in class file %s",
2200 name_index, CHECK_NULL);
2201 const Symbol* const name = cp->symbol_at(name_index);
2202 verify_legal_method_name(name, CHECK_NULL);
2203
2204 const u2 signature_index = cfs->get_u2_fast();
2205 guarantee_property(
2206 valid_symbol_at(signature_index),
2207 "Illegal constant pool index %u for method signature in class file %s",
2208 signature_index, CHECK_NULL);
2209 const Symbol* const signature = cp->symbol_at(signature_index);
2210
2211 if (name == vmSymbols::class_initializer_name()) {
2212 // We ignore the other access flags for a valid class initializer.
2213 // (JVM Spec 2nd ed., chapter 4.6)
2214 if (_major_version < 51) { // backward compatibility
2215 flags = JVM_ACC_STATIC;
2216 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2217 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2218 } else {
2219 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2220 return nullptr;
2221 }
2222 } else {
2223 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2224 }
2225
2226 if (name == vmSymbols::object_initializer_name() && is_interface) {
2227 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2228 return nullptr;
2229 }
2230
2231 if (EnableValhalla) {
2232 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2233 && ((flags & JVM_ACC_STATIC) == 0 )
2234 && !_access_flags.is_identity_class()) {
2235 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2236 return nullptr;
2237 }
2238 }
2239
2240 int args_size = -1; // only used when _need_verify is true
2241 if (_need_verify) {
2242 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2243 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2244 verify_legal_method_signature(name, signature, CHECK_NULL);
2245 if (args_size > MAX_ARGS_SIZE) {
2246 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2247 return nullptr;
2248 }
2249 }
2250
2251 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2252
2253 // Default values for code and exceptions attribute elements
2254 u2 max_stack = 0;
2255 u2 max_locals = 0;
2256 u4 code_length = 0;
2257 const u1* code_start = nullptr;
2258 u2 exception_table_length = 0;
2259 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2260 Array<int>* exception_handlers = Universe::the_empty_int_array();
2261 u2 checked_exceptions_length = 0;
2262 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2263 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2264 int linenumber_table_length = 0;
2265 int total_lvt_length = 0;
2266 u2 lvt_cnt = 0;
2267 u2 lvtt_cnt = 0;
2268 bool lvt_allocated = false;
2269 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2270 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2271 u2* localvariable_table_length = nullptr;
2272 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2273 u2* localvariable_type_table_length = nullptr;
2274 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2275 int method_parameters_length = -1;
2276 const u1* method_parameters_data = nullptr;
2277 bool method_parameters_seen = false;
2278 bool parsed_code_attribute = false;
2279 bool parsed_checked_exceptions_attribute = false;
2280 bool parsed_stackmap_attribute = false;
2281 // stackmap attribute - JDK1.5
2282 const u1* stackmap_data = nullptr;
2283 int stackmap_data_length = 0;
2284 u2 generic_signature_index = 0;
2285 MethodAnnotationCollector parsed_annotations;
2286 const u1* runtime_visible_annotations = nullptr;
2287 int runtime_visible_annotations_length = 0;
2288 const u1* runtime_visible_parameter_annotations = nullptr;
2289 int runtime_visible_parameter_annotations_length = 0;
2290 const u1* runtime_visible_type_annotations = nullptr;
2291 int runtime_visible_type_annotations_length = 0;
2292 bool runtime_invisible_annotations_exists = false;
2293 bool runtime_invisible_type_annotations_exists = false;
2294 bool runtime_invisible_parameter_annotations_exists = false;
2295 const u1* annotation_default = nullptr;
2296 int annotation_default_length = 0;
2297
2298 // Parse code and exceptions attribute
2299 u2 method_attributes_count = cfs->get_u2_fast();
2300 while (method_attributes_count--) {
2301 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2302 const u2 method_attribute_name_index = cfs->get_u2_fast();
2303 const u4 method_attribute_length = cfs->get_u4_fast();
2304 guarantee_property(
2305 valid_symbol_at(method_attribute_name_index),
2306 "Invalid method attribute name index %u in class file %s",
2307 method_attribute_name_index, CHECK_NULL);
2308
2309 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2310 if (method_attribute_name == vmSymbols::tag_code()) {
2311 // Parse Code attribute
2312 if (_need_verify) {
2313 guarantee_property(
2314 !access_flags.is_native() && !access_flags.is_abstract(),
2315 "Code attribute in native or abstract methods in class file %s",
2316 CHECK_NULL);
2317 }
2318 if (parsed_code_attribute) {
2319 classfile_parse_error("Multiple Code attributes in class file %s",
2320 THREAD);
2321 return nullptr;
2322 }
2323 parsed_code_attribute = true;
2324
2325 // Stack size, locals size, and code size
2326 cfs->guarantee_more(8, CHECK_NULL);
2327 max_stack = cfs->get_u2_fast();
2328 max_locals = cfs->get_u2_fast();
2329 code_length = cfs->get_u4_fast();
2330 if (_need_verify) {
2331 guarantee_property(args_size <= max_locals,
2332 "Arguments can't fit into locals in class file %s",
2333 CHECK_NULL);
2334 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2335 "Invalid method Code length %u in class file %s",
2336 code_length, CHECK_NULL);
2337 }
2338 // Code pointer
2339 code_start = cfs->current();
2340 assert(code_start != nullptr, "null code start");
2341 cfs->guarantee_more(code_length, CHECK_NULL);
2342 cfs->skip_u1_fast(code_length);
2343
2344 // Exception handler table
2345 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2346 exception_table_length = cfs->get_u2_fast();
2347 if (exception_table_length > 0) {
2348 exception_table_start = parse_exception_table(cfs,
2349 code_length,
2350 exception_table_length,
2351 CHECK_NULL);
2352 }
2353
2354 // Parse additional attributes in code attribute
2355 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2356 u2 code_attributes_count = cfs->get_u2_fast();
2357
2358 unsigned int calculated_attribute_length = 0;
2359
2360 calculated_attribute_length =
2361 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2362 calculated_attribute_length += checked_cast<unsigned int>(
2363 code_length +
2364 sizeof(exception_table_length) +
2365 sizeof(code_attributes_count) +
2366 exception_table_length *
2367 ( sizeof(u2) + // start_pc
2368 sizeof(u2) + // end_pc
2369 sizeof(u2) + // handler_pc
2370 sizeof(u2) )); // catch_type_index
2371
2372 while (code_attributes_count--) {
2373 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2374 const u2 code_attribute_name_index = cfs->get_u2_fast();
2375 const u4 code_attribute_length = cfs->get_u4_fast();
2376 calculated_attribute_length += code_attribute_length +
2377 (unsigned)sizeof(code_attribute_name_index) +
2378 (unsigned)sizeof(code_attribute_length);
2379 guarantee_property(valid_symbol_at(code_attribute_name_index),
2380 "Invalid code attribute name index %u in class file %s",
2381 code_attribute_name_index,
2382 CHECK_NULL);
2383 if (LoadLineNumberTables &&
2384 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2385 // Parse and compress line number table
2386 parse_linenumber_table(code_attribute_length,
2387 code_length,
2388 &linenumber_table,
2389 CHECK_NULL);
2390
2391 } else if (LoadLocalVariableTables &&
2392 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2393 // Parse local variable table
2394 if (!lvt_allocated) {
2395 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2396 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2397 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2398 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2399 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2400 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2401 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2402 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2403 lvt_allocated = true;
2404 }
2405 if (lvt_cnt == max_lvt_cnt) {
2406 max_lvt_cnt <<= 1;
2407 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2408 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2409 }
2410 localvariable_table_start[lvt_cnt] =
2411 parse_localvariable_table(cfs,
2412 code_length,
2413 max_locals,
2414 code_attribute_length,
2415 &localvariable_table_length[lvt_cnt],
2416 false, // is not LVTT
2417 CHECK_NULL);
2418 total_lvt_length += localvariable_table_length[lvt_cnt];
2419 lvt_cnt++;
2420 } else if (LoadLocalVariableTypeTables &&
2421 _major_version >= JAVA_1_5_VERSION &&
2422 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2423 if (!lvt_allocated) {
2424 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2425 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2426 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2427 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2428 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2429 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2430 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2431 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2432 lvt_allocated = true;
2433 }
2434 // Parse local variable type table
2435 if (lvtt_cnt == max_lvtt_cnt) {
2436 max_lvtt_cnt <<= 1;
2437 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2438 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2439 }
2440 localvariable_type_table_start[lvtt_cnt] =
2441 parse_localvariable_table(cfs,
2442 code_length,
2443 max_locals,
2444 code_attribute_length,
2445 &localvariable_type_table_length[lvtt_cnt],
2446 true, // is LVTT
2447 CHECK_NULL);
2448 lvtt_cnt++;
2449 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2450 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2451 // Stack map is only needed by the new verifier in JDK1.5.
2452 if (parsed_stackmap_attribute) {
2453 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2454 return nullptr;
2455 }
2456 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2457 stackmap_data_length = code_attribute_length;
2458 parsed_stackmap_attribute = true;
2459 } else {
2460 // Skip unknown attributes
2461 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2462 }
2463 }
2464 // check method attribute length
2465 if (_need_verify) {
2466 guarantee_property(method_attribute_length == calculated_attribute_length,
2467 "Code segment has wrong length in class file %s",
2468 CHECK_NULL);
2469 }
2470 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2471 // Parse Exceptions attribute
2472 if (parsed_checked_exceptions_attribute) {
2473 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2474 THREAD);
2475 return nullptr;
2476 }
2477 parsed_checked_exceptions_attribute = true;
2478 checked_exceptions_start =
2479 parse_checked_exceptions(cfs,
2480 &checked_exceptions_length,
2481 method_attribute_length,
2482 CHECK_NULL);
2483 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2484 // reject multiple method parameters
2485 if (method_parameters_seen) {
2486 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2487 THREAD);
2488 return nullptr;
2489 }
2490 method_parameters_seen = true;
2491 method_parameters_length = cfs->get_u1_fast();
2492 const u4 real_length = (method_parameters_length * 4u) + 1u;
2493 if (method_attribute_length != real_length) {
2494 classfile_parse_error(
2495 "Invalid MethodParameters method attribute length %u in class file",
2496 method_attribute_length, THREAD);
2497 return nullptr;
2498 }
2499 method_parameters_data = cfs->current();
2500 cfs->skip_u2_fast(method_parameters_length);
2501 cfs->skip_u2_fast(method_parameters_length);
2502 // ignore this attribute if it cannot be reflected
2503 if (!vmClasses::Parameter_klass_loaded())
2504 method_parameters_length = -1;
2505 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2506 if (method_attribute_length != 0) {
2507 classfile_parse_error(
2508 "Invalid Synthetic method attribute length %u in class file %s",
2509 method_attribute_length, THREAD);
2510 return nullptr;
2511 }
2512 // Should we check that there hasn't already been a synthetic attribute?
2513 access_flags.set_is_synthetic();
2514 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2515 if (method_attribute_length != 0) {
2516 classfile_parse_error(
2517 "Invalid Deprecated method attribute length %u in class file %s",
2518 method_attribute_length, THREAD);
2519 return nullptr;
2520 }
2521 } else if (_major_version >= JAVA_1_5_VERSION) {
2522 if (method_attribute_name == vmSymbols::tag_signature()) {
2523 if (generic_signature_index != 0) {
2524 classfile_parse_error(
2525 "Multiple Signature attributes for method in class file %s",
2526 THREAD);
2527 return nullptr;
2528 }
2529 if (method_attribute_length != 2) {
2530 classfile_parse_error(
2531 "Invalid Signature attribute length %u in class file %s",
2532 method_attribute_length, THREAD);
2533 return nullptr;
2534 }
2535 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2536 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2537 if (runtime_visible_annotations != nullptr) {
2538 classfile_parse_error(
2539 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2540 THREAD);
2541 return nullptr;
2542 }
2543 runtime_visible_annotations_length = method_attribute_length;
2544 runtime_visible_annotations = cfs->current();
2545 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2546 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2547 parse_annotations(cp,
2548 runtime_visible_annotations,
2549 runtime_visible_annotations_length,
2550 &parsed_annotations,
2551 _loader_data,
2552 _can_access_vm_annotations);
2553 cfs->skip_u1_fast(runtime_visible_annotations_length);
2554 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2555 if (runtime_invisible_annotations_exists) {
2556 classfile_parse_error(
2557 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2558 THREAD);
2559 return nullptr;
2560 }
2561 runtime_invisible_annotations_exists = true;
2562 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2563 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2564 if (runtime_visible_parameter_annotations != nullptr) {
2565 classfile_parse_error(
2566 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2567 THREAD);
2568 return nullptr;
2569 }
2570 runtime_visible_parameter_annotations_length = method_attribute_length;
2571 runtime_visible_parameter_annotations = cfs->current();
2572 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2573 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2574 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2575 if (runtime_invisible_parameter_annotations_exists) {
2576 classfile_parse_error(
2577 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2578 THREAD);
2579 return nullptr;
2580 }
2581 runtime_invisible_parameter_annotations_exists = true;
2582 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2583 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2584 if (annotation_default != nullptr) {
2585 classfile_parse_error(
2586 "Multiple AnnotationDefault attributes for method in class file %s",
2587 THREAD);
2588 return nullptr;
2589 }
2590 annotation_default_length = method_attribute_length;
2591 annotation_default = cfs->current();
2592 assert(annotation_default != nullptr, "null annotation default");
2593 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2594 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2595 if (runtime_visible_type_annotations != nullptr) {
2596 classfile_parse_error(
2597 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2598 THREAD);
2599 return nullptr;
2600 }
2601 runtime_visible_type_annotations_length = method_attribute_length;
2602 runtime_visible_type_annotations = cfs->current();
2603 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2604 // No need for the VM to parse Type annotations
2605 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2606 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2607 if (runtime_invisible_type_annotations_exists) {
2608 classfile_parse_error(
2609 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2610 THREAD);
2611 return nullptr;
2612 }
2613 runtime_invisible_type_annotations_exists = true;
2614 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2615 } else {
2616 // Skip unknown attributes
2617 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2618 }
2619 } else {
2620 // Skip unknown attributes
2621 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2622 }
2623 }
2624
2625 if (linenumber_table != nullptr) {
2626 linenumber_table->write_terminator();
2627 linenumber_table_length = linenumber_table->position();
2628 }
2629
2630 // Make sure there's at least one Code attribute in non-native/non-abstract method
2631 if (_need_verify) {
2632 guarantee_property(access_flags.is_native() ||
2633 access_flags.is_abstract() ||
2634 parsed_code_attribute,
2635 "Absent Code attribute in method that is not native or abstract in class file %s",
2636 CHECK_NULL);
2637 }
2638
2639 // All sizing information for a Method* is finally available, now create it
2640 InlineTableSizes sizes(
2641 total_lvt_length,
2642 linenumber_table_length,
2643 exception_table_length,
2644 checked_exceptions_length,
2645 method_parameters_length,
2646 generic_signature_index,
2647 runtime_visible_annotations_length,
2648 runtime_visible_parameter_annotations_length,
2649 runtime_visible_type_annotations_length,
2650 annotation_default_length,
2651 0);
2652
2653 Method* const m = Method::allocate(_loader_data,
2654 code_length,
2655 access_flags,
2656 &sizes,
2657 ConstMethod::NORMAL,
2658 _cp->symbol_at(name_index),
2659 CHECK_NULL);
2660
2661 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2662
2663 // Fill in information from fixed part (access_flags already set)
2664 m->set_constants(_cp);
2665 m->set_name_index(name_index);
2666 m->set_signature_index(signature_index);
2667 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2668 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2669
2670 // Fill in code attribute information
2671 m->set_max_stack(max_stack);
2672 m->set_max_locals(max_locals);
2673 if (stackmap_data != nullptr) {
2674 m->constMethod()->copy_stackmap_data(_loader_data,
2675 (u1*)stackmap_data,
2676 stackmap_data_length,
2677 CHECK_NULL);
2678 }
2679
2680 // Copy byte codes
2681 m->set_code((u1*)code_start);
2682
2683 // Copy line number table
2684 if (linenumber_table != nullptr) {
2685 memcpy(m->compressed_linenumber_table(),
2686 linenumber_table->buffer(),
2687 linenumber_table_length);
2688 }
2689
2690 // Copy exception table
2691 if (exception_table_length > 0) {
2692 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2693 m->exception_table_start(),
2694 exception_table_length * sizeof(ExceptionTableElement),
2695 sizeof(u2));
2696 }
2697
2698 // Copy method parameters
2699 if (method_parameters_length > 0) {
2700 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2701 for (int i = 0; i < method_parameters_length; i++) {
2702 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2703 method_parameters_data += 2;
2704 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2705 method_parameters_data += 2;
2706 }
2707 }
2708
2709 // Copy checked exceptions
2710 if (checked_exceptions_length > 0) {
2711 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2712 m->checked_exceptions_start(),
2713 checked_exceptions_length * sizeof(CheckedExceptionElement),
2714 sizeof(u2));
2715 }
2716
2717 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2718 if (total_lvt_length > 0) {
2719 *has_localvariable_table = true;
2720 copy_localvariable_table(m->constMethod(),
2721 lvt_cnt,
2722 localvariable_table_length,
2723 localvariable_table_start,
2724 lvtt_cnt,
2725 localvariable_type_table_length,
2726 localvariable_type_table_start,
2727 CHECK_NULL);
2728 }
2729
2730 if (parsed_annotations.has_any_annotations())
2731 parsed_annotations.apply_to(methodHandle(THREAD, m));
2732
2733 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2734 m->set_is_hidden();
2735 }
2736
2737 // Copy annotations
2738 copy_method_annotations(m->constMethod(),
2739 runtime_visible_annotations,
2740 runtime_visible_annotations_length,
2741 runtime_visible_parameter_annotations,
2742 runtime_visible_parameter_annotations_length,
2743 runtime_visible_type_annotations,
2744 runtime_visible_type_annotations_length,
2745 annotation_default,
2746 annotation_default_length,
2747 CHECK_NULL);
2748
2749 if (InstanceKlass::is_finalization_enabled() &&
2750 name == vmSymbols::finalize_method_name() &&
2751 signature == vmSymbols::void_method_signature()) {
2752 if (m->is_empty_method()) {
2753 _has_empty_finalizer = true;
2754 } else {
2755 _has_finalizer = true;
2756 }
2757 }
2758
2759 NOT_PRODUCT(m->verify());
2760 return m;
2761 }
2762
2763
2764 // Side-effects: populates the _methods field in the parser
2765 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2766 bool is_interface,
2767 bool is_value_class,
2768 bool is_abstract_type,
2769 bool* const has_localvariable_table,
2770 bool* has_final_method,
2771 bool* declares_nonstatic_concrete_methods,
2772 TRAPS) {
2773 assert(cfs != nullptr, "invariant");
2774 assert(has_localvariable_table != nullptr, "invariant");
2775 assert(has_final_method != nullptr, "invariant");
2776 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2777
2778 assert(nullptr == _methods, "invariant");
2779
2780 cfs->guarantee_more(2, CHECK); // length
2781 const u2 length = cfs->get_u2_fast();
2782 if (length == 0) {
2783 _methods = Universe::the_empty_method_array();
2784 } else {
2785 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2786 length,
2787 nullptr,
2788 CHECK);
2789
2790 for (int index = 0; index < length; index++) {
2791 Method* method = parse_method(cfs,
2792 is_interface,
2793 is_value_class,
2794 is_abstract_type,
2795 _cp,
2796 has_localvariable_table,
2797 CHECK);
2798
2799 if (method->is_final()) {
2800 *has_final_method = true;
2801 }
2802 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2803 // used for interface initialization, and default method inheritance analysis
2804 if (is_interface && !(*declares_nonstatic_concrete_methods)
2805 && !method->is_abstract() && !method->is_static()) {
2806 *declares_nonstatic_concrete_methods = true;
2807 }
2808 _methods->at_put(index, method);
2809 }
2810
2811 if (_need_verify && length > 1) {
2812 // Check duplicated methods
2813 ResourceMark rm(THREAD);
2814 // Set containing name-signature pairs
2815 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2816 for (int i = 0; i < length; i++) {
2817 const Method* const m = _methods->at(i);
2818 NameSigHash name_and_sig(m->name(), m->signature());
2819 // If no duplicates, add name/signature in hashtable names_and_sigs.
2820 if(!names_and_sigs->put(name_and_sig, 0)) {
2821 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2822 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2823 return;
2824 }
2825 }
2826 }
2827 }
2828 }
2829
2830 static const intArray* sort_methods(Array<Method*>* methods) {
2831 const int length = methods->length();
2832 // If JVMTI original method ordering or sharing is enabled we have to
2833 // remember the original class file ordering.
2834 // We temporarily use the vtable_index field in the Method* to store the
2835 // class file index, so we can read in after calling qsort.
2836 // Put the method ordering in the shared archive.
2837 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2838 for (int index = 0; index < length; index++) {
2839 Method* const m = methods->at(index);
2840 assert(!m->valid_vtable_index(), "vtable index should not be set");
2841 m->set_vtable_index(index);
2842 }
2843 }
2844 // Sort method array by ascending method name (for faster lookups & vtable construction)
2845 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2846 Method::sort_methods(methods);
2847
2848 intArray* method_ordering = nullptr;
2849 // If JVMTI original method ordering or sharing is enabled construct int
2850 // array remembering the original ordering
2851 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2852 method_ordering = new intArray(length, length, -1);
2853 for (int index = 0; index < length; index++) {
2854 Method* const m = methods->at(index);
2855 const int old_index = m->vtable_index();
2856 assert(old_index >= 0 && old_index < length, "invalid method index");
2857 method_ordering->at_put(index, old_index);
2858 m->set_vtable_index(Method::invalid_vtable_index);
2859 }
2860 }
2861 return method_ordering;
2862 }
2863
2864 // Parse generic_signature attribute for methods and fields
2865 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2866 TRAPS) {
2867 assert(cfs != nullptr, "invariant");
2868
2869 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2870 const u2 generic_signature_index = cfs->get_u2_fast();
2871 guarantee_property(
2872 valid_symbol_at(generic_signature_index),
2873 "Invalid Signature attribute at constant pool index %u in class file %s",
2874 generic_signature_index, CHECK_0);
2875 return generic_signature_index;
2876 }
2877
2878 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2879 TRAPS) {
2880
2881 assert(cfs != nullptr, "invariant");
2882
2883 cfs->guarantee_more(2, CHECK); // sourcefile_index
2884 const u2 sourcefile_index = cfs->get_u2_fast();
2885 guarantee_property(
2886 valid_symbol_at(sourcefile_index),
2887 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2888 sourcefile_index, CHECK);
2889 set_class_sourcefile_index(sourcefile_index);
2890 }
2891
2892 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2893 int length,
2894 TRAPS) {
2895 assert(cfs != nullptr, "invariant");
2896
2897 const u1* const sde_buffer = cfs->current();
2898 assert(sde_buffer != nullptr, "null sde buffer");
2899
2900 // Don't bother storing it if there is no way to retrieve it
2901 if (JvmtiExport::can_get_source_debug_extension()) {
2902 assert((length+1) > length, "Overflow checking");
2903 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2904 for (int i = 0; i < length; i++) {
2905 sde[i] = sde_buffer[i];
2906 }
2907 sde[length] = '\0';
2908 set_class_sde_buffer((const char*)sde, length);
2909 }
2910 // Got utf8 string, set stream position forward
2911 cfs->skip_u1(length, CHECK);
2912 }
2913
2914
2915 // Inner classes can be static, private or protected (classic VM does this)
2916 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2917 JVM_ACC_PRIVATE | \
2918 JVM_ACC_PROTECTED | \
2919 JVM_ACC_STATIC \
2920 )
2921
2922 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2923 // Return -1 if none is found.
2924 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2925 Symbol* cp_klass_name = cp->klass_name_at(inner);
2926 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2927 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2928 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2929 return idx;
2930 }
2931 }
2932 return -1;
2933 }
2934
2935 // Return the outer_class_info_index for the InnerClasses entry containing the
2936 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2937 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2938 if (inner == 0) return -1;
2939 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2940 if (idx == -1) return -1;
2941 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2942 return result;
2943 }
2944
2945 // Return true if circularity is found, false if no circularity is found.
2946 // Use Floyd's cycle finding algorithm.
2947 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2948 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2949 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2950
2951 while (fast != -1 && fast != 0) {
2952 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2953 return true; // found a circularity
2954 }
2955 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2956 if (fast == -1) return false;
2957 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2958 if (fast == -1) return false;
2959 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2960 assert(slow != -1, "sanity check");
2961 }
2962 return false;
2963 }
2964
2965 // Loop through each InnerClasses entry checking for circularities and duplications
2966 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
2967 // return true if a circularity or entries with duplicate inner_class_info_indexes
2968 // are found.
2969 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2970 // Loop through each InnerClasses entry.
2971 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2972 // Return true if there are circular entries.
2973 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2974 return true;
2975 }
2976 // Check if there are duplicate entries or entries with the same inner_class_info_index.
2977 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2978 y += InstanceKlass::inner_class_next_offset) {
2979
2980 // 4347400: make sure there's no duplicate entry in the classes array
2981 if (_major_version >= JAVA_1_5_VERSION) {
2982 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2983 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2984 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2985 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2986 "Duplicate entry in InnerClasses attribute in class file %s",
2987 CHECK_(true));
2988 }
2989 // Return true if there are two entries with the same inner_class_info_index.
2990 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2991 return true;
2992 }
2993 }
2994 }
2995 return false;
2996 }
2997
2998 // Return number of classes in the inner classes attribute table
2999 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3000 const ConstantPool* cp,
3001 const u1* const inner_classes_attribute_start,
3002 bool parsed_enclosingmethod_attribute,
3003 u2 enclosing_method_class_index,
3004 u2 enclosing_method_method_index,
3005 TRAPS) {
3006 const u1* const current_mark = cfs->current();
3007 u2 length = 0;
3008 if (inner_classes_attribute_start != nullptr) {
3009 cfs->set_current(inner_classes_attribute_start);
3010 cfs->guarantee_more(2, CHECK_0); // length
3011 length = cfs->get_u2_fast();
3012 }
3013
3014 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3015 // method data:
3016 // [inner_class_info_index,
3017 // outer_class_info_index,
3018 // inner_name_index,
3019 // inner_class_access_flags,
3020 // ...
3021 // enclosing_method_class_index,
3022 // enclosing_method_method_index]
3023 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3024 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3025 _inner_classes = inner_classes;
3026
3027 int index = 0;
3028 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3029 for (int n = 0; n < length; n++) {
3030 // Inner class index
3031 const u2 inner_class_info_index = cfs->get_u2_fast();
3032 guarantee_property(
3033 valid_klass_reference_at(inner_class_info_index),
3034 "inner_class_info_index %u has bad constant type in class file %s",
3035 inner_class_info_index, CHECK_0);
3036 // Outer class index
3037 const u2 outer_class_info_index = cfs->get_u2_fast();
3038 guarantee_property(
3039 outer_class_info_index == 0 ||
3040 valid_klass_reference_at(outer_class_info_index),
3041 "outer_class_info_index %u has bad constant type in class file %s",
3042 outer_class_info_index, CHECK_0);
3043
3044 if (outer_class_info_index != 0) {
3045 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3046 char* bytes = (char*)outer_class_name->bytes();
3047 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3048 "Outer class is an array class in class file %s", CHECK_0);
3049 }
3050 // Inner class name
3051 const u2 inner_name_index = cfs->get_u2_fast();
3052 guarantee_property(
3053 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3054 "inner_name_index %u has bad constant type in class file %s",
3055 inner_name_index, CHECK_0);
3056 if (_need_verify) {
3057 guarantee_property(inner_class_info_index != outer_class_info_index,
3058 "Class is both outer and inner class in class file %s", CHECK_0);
3059 }
3060
3061 u2 recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3062 // JVM_ACC_MODULE is defined in JDK-9 and later.
3063 if (_major_version >= JAVA_9_VERSION) {
3064 recognized_modifiers |= JVM_ACC_MODULE;
3065 }
3066
3067 // Access flags
3068 u2 flags = cfs->get_u2_fast() & recognized_modifiers;
3069
3070 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3071 // Set abstract bit for old class files for backward compatibility
3072 flags |= JVM_ACC_ABSTRACT;
3073 }
3074
3075 if (!supports_inline_types()) {
3076 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3077 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3078 if (!is_module && !is_interface) {
3079 flags |= JVM_ACC_IDENTITY;
3080 }
3081 }
3082
3083 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3084 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3085 AccessFlags inner_access_flags(flags);
3086
3087 inner_classes->at_put(index++, inner_class_info_index);
3088 inner_classes->at_put(index++, outer_class_info_index);
3089 inner_classes->at_put(index++, inner_name_index);
3090 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3091 }
3092
3093 // Check for circular and duplicate entries.
3094 bool has_circularity = false;
3095 if (_need_verify) {
3096 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3097 if (has_circularity) {
3098 // If circularity check failed then ignore InnerClasses attribute.
3099 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3100 index = 0;
3101 if (parsed_enclosingmethod_attribute) {
3102 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3103 _inner_classes = inner_classes;
3104 } else {
3105 _inner_classes = Universe::the_empty_short_array();
3106 }
3107 }
3108 }
3109 // Set EnclosingMethod class and method indexes.
3110 if (parsed_enclosingmethod_attribute) {
3111 inner_classes->at_put(index++, enclosing_method_class_index);
3112 inner_classes->at_put(index++, enclosing_method_method_index);
3113 }
3114 assert(index == size || has_circularity, "wrong size");
3115
3116 // Restore buffer's current position.
3117 cfs->set_current(current_mark);
3118
3119 return length;
3120 }
3121
3122 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3123 const u1* const nest_members_attribute_start,
3124 TRAPS) {
3125 const u1* const current_mark = cfs->current();
3126 u2 length = 0;
3127 if (nest_members_attribute_start != nullptr) {
3128 cfs->set_current(nest_members_attribute_start);
3129 cfs->guarantee_more(2, CHECK_0); // length
3130 length = cfs->get_u2_fast();
3131 }
3132 const int size = length;
3133 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3134 _nest_members = nest_members;
3135
3136 int index = 0;
3137 cfs->guarantee_more(2 * length, CHECK_0);
3138 for (int n = 0; n < length; n++) {
3139 const u2 class_info_index = cfs->get_u2_fast();
3140 guarantee_property(
3141 valid_klass_reference_at(class_info_index),
3142 "Nest member class_info_index %u has bad constant type in class file %s",
3143 class_info_index, CHECK_0);
3144 nest_members->at_put(index++, class_info_index);
3145 }
3146 assert(index == size, "wrong size");
3147
3148 // Restore buffer's current position.
3149 cfs->set_current(current_mark);
3150
3151 return length;
3152 }
3153
3154 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3155 const u1* const permitted_subclasses_attribute_start,
3156 TRAPS) {
3157 const u1* const current_mark = cfs->current();
3158 u2 length = 0;
3159 if (permitted_subclasses_attribute_start != nullptr) {
3160 cfs->set_current(permitted_subclasses_attribute_start);
3161 cfs->guarantee_more(2, CHECK_0); // length
3162 length = cfs->get_u2_fast();
3163 }
3164 const int size = length;
3165 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3166 _permitted_subclasses = permitted_subclasses;
3167
3168 if (length > 0) {
3169 int index = 0;
3170 cfs->guarantee_more(2 * length, CHECK_0);
3171 for (int n = 0; n < length; n++) {
3172 const u2 class_info_index = cfs->get_u2_fast();
3173 guarantee_property(
3174 valid_klass_reference_at(class_info_index),
3175 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3176 class_info_index, CHECK_0);
3177 permitted_subclasses->at_put(index++, class_info_index);
3178 }
3179 assert(index == size, "wrong size");
3180 }
3181
3182 // Restore buffer's current position.
3183 cfs->set_current(current_mark);
3184
3185 return length;
3186 }
3187
3188 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3189 const u1* const loadable_descriptors_attribute_start,
3190 TRAPS) {
3191 const u1* const current_mark = cfs->current();
3192 u2 length = 0;
3193 if (loadable_descriptors_attribute_start != nullptr) {
3194 cfs->set_current(loadable_descriptors_attribute_start);
3195 cfs->guarantee_more(2, CHECK_0); // length
3196 length = cfs->get_u2_fast();
3197 }
3198 const int size = length;
3199 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3200 _loadable_descriptors = loadable_descriptors;
3201 if (length > 0) {
3202 int index = 0;
3203 cfs->guarantee_more(2 * length, CHECK_0);
3204 for (int n = 0; n < length; n++) {
3205 const u2 descriptor_index = cfs->get_u2_fast();
3206 guarantee_property(
3207 valid_symbol_at(descriptor_index),
3208 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3209 descriptor_index, CHECK_0);
3210 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3211 bool valid = legal_field_signature(descriptor, CHECK_0);
3212 if(!valid) {
3213 ResourceMark rm(THREAD);
3214 Exceptions::fthrow(THREAD_AND_LOCATION,
3215 vmSymbols::java_lang_ClassFormatError(),
3216 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3217 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3218 return 0;
3219 }
3220 loadable_descriptors->at_put(index++, descriptor_index);
3221 }
3222 assert(index == size, "wrong size");
3223 }
3224
3225 // Restore buffer's current position.
3226 cfs->set_current(current_mark);
3227
3228 return length;
3229 }
3230
3231 // Record {
3232 // u2 attribute_name_index;
3233 // u4 attribute_length;
3234 // u2 components_count;
3235 // component_info components[components_count];
3236 // }
3237 // component_info {
3238 // u2 name_index;
3239 // u2 descriptor_index
3240 // u2 attributes_count;
3241 // attribute_info_attributes[attributes_count];
3242 // }
3243 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3244 const ConstantPool* cp,
3245 const u1* const record_attribute_start,
3246 TRAPS) {
3247 const u1* const current_mark = cfs->current();
3248 int components_count = 0;
3249 unsigned int calculate_attr_size = 0;
3250 if (record_attribute_start != nullptr) {
3251 cfs->set_current(record_attribute_start);
3252 cfs->guarantee_more(2, CHECK_0); // num of components
3253 components_count = (int)cfs->get_u2_fast();
3254 calculate_attr_size = 2;
3255 }
3256
3257 Array<RecordComponent*>* const record_components =
3258 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3259 _record_components = record_components;
3260
3261 for (int x = 0; x < components_count; x++) {
3262 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3263
3264 const u2 name_index = cfs->get_u2_fast();
3265 guarantee_property(valid_symbol_at(name_index),
3266 "Invalid constant pool index %u for name in Record attribute in class file %s",
3267 name_index, CHECK_0);
3268 const Symbol* const name = cp->symbol_at(name_index);
3269 verify_legal_field_name(name, CHECK_0);
3270
3271 const u2 descriptor_index = cfs->get_u2_fast();
3272 guarantee_property(valid_symbol_at(descriptor_index),
3273 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3274 descriptor_index, CHECK_0);
3275 const Symbol* const descr = cp->symbol_at(descriptor_index);
3276 verify_legal_field_signature(name, descr, CHECK_0);
3277
3278 const u2 attributes_count = cfs->get_u2_fast();
3279 calculate_attr_size += 6;
3280 u2 generic_sig_index = 0;
3281 const u1* runtime_visible_annotations = nullptr;
3282 int runtime_visible_annotations_length = 0;
3283 bool runtime_invisible_annotations_exists = false;
3284 const u1* runtime_visible_type_annotations = nullptr;
3285 int runtime_visible_type_annotations_length = 0;
3286 bool runtime_invisible_type_annotations_exists = false;
3287
3288 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3289 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3290 for (int y = 0; y < attributes_count; y++) {
3291 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3292 const u2 attribute_name_index = cfs->get_u2_fast();
3293 const u4 attribute_length = cfs->get_u4_fast();
3294 calculate_attr_size += 6;
3295 guarantee_property(
3296 valid_symbol_at(attribute_name_index),
3297 "Invalid Record attribute name index %u in class file %s",
3298 attribute_name_index, CHECK_0);
3299
3300 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3301 if (attribute_name == vmSymbols::tag_signature()) {
3302 if (generic_sig_index != 0) {
3303 classfile_parse_error(
3304 "Multiple Signature attributes for Record component in class file %s",
3305 THREAD);
3306 return 0;
3307 }
3308 if (attribute_length != 2) {
3309 classfile_parse_error(
3310 "Invalid Signature attribute length %u in Record component in class file %s",
3311 attribute_length, THREAD);
3312 return 0;
3313 }
3314 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3315
3316 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3317 if (runtime_visible_annotations != nullptr) {
3318 classfile_parse_error(
3319 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3320 return 0;
3321 }
3322 runtime_visible_annotations_length = attribute_length;
3323 runtime_visible_annotations = cfs->current();
3324
3325 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3326 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3327 cfs->skip_u1_fast(runtime_visible_annotations_length);
3328
3329 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3330 if (runtime_invisible_annotations_exists) {
3331 classfile_parse_error(
3332 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3333 return 0;
3334 }
3335 runtime_invisible_annotations_exists = true;
3336 cfs->skip_u1(attribute_length, CHECK_0);
3337
3338 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3339 if (runtime_visible_type_annotations != nullptr) {
3340 classfile_parse_error(
3341 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3342 return 0;
3343 }
3344 runtime_visible_type_annotations_length = attribute_length;
3345 runtime_visible_type_annotations = cfs->current();
3346
3347 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3348 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3349 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3350
3351 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3352 if (runtime_invisible_type_annotations_exists) {
3353 classfile_parse_error(
3354 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3355 return 0;
3356 }
3357 runtime_invisible_type_annotations_exists = true;
3358 cfs->skip_u1(attribute_length, CHECK_0);
3359
3360 } else {
3361 // Skip unknown attributes
3362 cfs->skip_u1(attribute_length, CHECK_0);
3363 }
3364 calculate_attr_size += attribute_length;
3365 } // End of attributes For loop
3366
3367 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3368 runtime_visible_annotations_length,
3369 CHECK_0);
3370 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3371 runtime_visible_type_annotations_length,
3372 CHECK_0);
3373
3374 RecordComponent* record_component =
3375 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3376 annotations, type_annotations, CHECK_0);
3377 record_components->at_put(x, record_component);
3378 } // End of component processing loop
3379
3380 // Restore buffer's current position.
3381 cfs->set_current(current_mark);
3382 return calculate_attr_size;
3383 }
3384
3385 void ClassFileParser::parse_classfile_synthetic_attribute() {
3386 set_class_synthetic_flag(true);
3387 }
3388
3389 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3390 assert(cfs != nullptr, "invariant");
3391
3392 const u2 signature_index = cfs->get_u2(CHECK);
3393 guarantee_property(
3394 valid_symbol_at(signature_index),
3395 "Invalid constant pool index %u in Signature attribute in class file %s",
3396 signature_index, CHECK);
3397 set_class_generic_signature_index(signature_index);
3398 }
3399
3400 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3401 ConstantPool* cp,
3402 u4 attribute_byte_length,
3403 TRAPS) {
3404 assert(cfs != nullptr, "invariant");
3405 assert(cp != nullptr, "invariant");
3406
3407 const u1* const current_start = cfs->current();
3408
3409 guarantee_property(attribute_byte_length >= sizeof(u2),
3410 "Invalid BootstrapMethods attribute length %u in class file %s",
3411 attribute_byte_length,
3412 CHECK);
3413
3414 cfs->guarantee_more(attribute_byte_length, CHECK);
3415
3416 const int attribute_array_length = cfs->get_u2_fast();
3417
3418 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3419 "Short length on BootstrapMethods in class file %s",
3420 CHECK);
3421
3422
3423 // The attribute contains a counted array of counted tuples of shorts,
3424 // represending bootstrap specifiers:
3425 // length*{bootstrap_method_index, argument_count*{argument_index}}
3426 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3427 // operand_count = number of shorts in attr, except for leading length
3428
3429 // The attribute is copied into a short[] array.
3430 // The array begins with a series of short[2] pairs, one for each tuple.
3431 const int index_size = (attribute_array_length * 2);
3432
3433 Array<u2>* const operands =
3434 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3435
3436 // Eagerly assign operands so they will be deallocated with the constant
3437 // pool if there is an error.
3438 cp->set_operands(operands);
3439
3440 int operand_fill_index = index_size;
3441 const int cp_size = cp->length();
3442
3443 for (int n = 0; n < attribute_array_length; n++) {
3444 // Store a 32-bit offset into the header of the operand array.
3445 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3446
3447 // Read a bootstrap specifier.
3448 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3449 const u2 bootstrap_method_index = cfs->get_u2_fast();
3450 const u2 argument_count = cfs->get_u2_fast();
3451 guarantee_property(
3452 valid_cp_range(bootstrap_method_index, cp_size) &&
3453 cp->tag_at(bootstrap_method_index).is_method_handle(),
3454 "bootstrap_method_index %u has bad constant type in class file %s",
3455 bootstrap_method_index,
3456 CHECK);
3457
3458 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3459 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3460 CHECK);
3461
3462 operands->at_put(operand_fill_index++, bootstrap_method_index);
3463 operands->at_put(operand_fill_index++, argument_count);
3464
3465 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3466 for (int j = 0; j < argument_count; j++) {
3467 const u2 argument_index = cfs->get_u2_fast();
3468 guarantee_property(
3469 valid_cp_range(argument_index, cp_size) &&
3470 cp->tag_at(argument_index).is_loadable_constant(),
3471 "argument_index %u has bad constant type in class file %s",
3472 argument_index,
3473 CHECK);
3474 operands->at_put(operand_fill_index++, argument_index);
3475 }
3476 }
3477 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3478 "Bad length on BootstrapMethods in class file %s",
3479 CHECK);
3480 }
3481
3482 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3483 ConstantPool* cp,
3484 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3485 TRAPS) {
3486 assert(cfs != nullptr, "invariant");
3487 assert(cp != nullptr, "invariant");
3488 assert(parsed_annotations != nullptr, "invariant");
3489
3490 // Set inner classes attribute to default sentinel
3491 _inner_classes = Universe::the_empty_short_array();
3492 // Set nest members attribute to default sentinel
3493 _nest_members = Universe::the_empty_short_array();
3494 // Set _permitted_subclasses attribute to default sentinel
3495 _permitted_subclasses = Universe::the_empty_short_array();
3496 // Set _loadable_descriptors attribute to default sentinel
3497 _loadable_descriptors = Universe::the_empty_short_array();
3498 cfs->guarantee_more(2, CHECK); // attributes_count
3499 u2 attributes_count = cfs->get_u2_fast();
3500 bool parsed_sourcefile_attribute = false;
3501 bool parsed_innerclasses_attribute = false;
3502 bool parsed_nest_members_attribute = false;
3503 bool parsed_permitted_subclasses_attribute = false;
3504 bool parsed_loadable_descriptors_attribute = false;
3505 bool parsed_nest_host_attribute = false;
3506 bool parsed_record_attribute = false;
3507 bool parsed_enclosingmethod_attribute = false;
3508 bool parsed_bootstrap_methods_attribute = false;
3509 const u1* runtime_visible_annotations = nullptr;
3510 int runtime_visible_annotations_length = 0;
3511 const u1* runtime_visible_type_annotations = nullptr;
3512 int runtime_visible_type_annotations_length = 0;
3513 bool runtime_invisible_type_annotations_exists = false;
3514 bool runtime_invisible_annotations_exists = false;
3515 bool parsed_source_debug_ext_annotations_exist = false;
3516 const u1* inner_classes_attribute_start = nullptr;
3517 u4 inner_classes_attribute_length = 0;
3518 u2 enclosing_method_class_index = 0;
3519 u2 enclosing_method_method_index = 0;
3520 const u1* nest_members_attribute_start = nullptr;
3521 u4 nest_members_attribute_length = 0;
3522 const u1* record_attribute_start = nullptr;
3523 u4 record_attribute_length = 0;
3524 const u1* permitted_subclasses_attribute_start = nullptr;
3525 u4 permitted_subclasses_attribute_length = 0;
3526 const u1* loadable_descriptors_attribute_start = nullptr;
3527 u4 loadable_descriptors_attribute_length = 0;
3528
3529 // Iterate over attributes
3530 while (attributes_count--) {
3531 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3532 const u2 attribute_name_index = cfs->get_u2_fast();
3533 const u4 attribute_length = cfs->get_u4_fast();
3534 guarantee_property(
3535 valid_symbol_at(attribute_name_index),
3536 "Attribute name has bad constant pool index %u in class file %s",
3537 attribute_name_index, CHECK);
3538 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3539 if (tag == vmSymbols::tag_source_file()) {
3540 // Check for SourceFile tag
3541 if (_need_verify) {
3542 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3543 }
3544 if (parsed_sourcefile_attribute) {
3545 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3546 return;
3547 } else {
3548 parsed_sourcefile_attribute = true;
3549 }
3550 parse_classfile_sourcefile_attribute(cfs, CHECK);
3551 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3552 // Check for SourceDebugExtension tag
3553 if (parsed_source_debug_ext_annotations_exist) {
3554 classfile_parse_error(
3555 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3556 return;
3557 }
3558 parsed_source_debug_ext_annotations_exist = true;
3559 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3560 } else if (tag == vmSymbols::tag_inner_classes()) {
3561 // Check for InnerClasses tag
3562 if (parsed_innerclasses_attribute) {
3563 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3564 return;
3565 } else {
3566 parsed_innerclasses_attribute = true;
3567 }
3568 inner_classes_attribute_start = cfs->current();
3569 inner_classes_attribute_length = attribute_length;
3570 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3571 } else if (tag == vmSymbols::tag_synthetic()) {
3572 // Check for Synthetic tag
3573 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3574 if (attribute_length != 0) {
3575 classfile_parse_error(
3576 "Invalid Synthetic classfile attribute length %u in class file %s",
3577 attribute_length, THREAD);
3578 return;
3579 }
3580 parse_classfile_synthetic_attribute();
3581 } else if (tag == vmSymbols::tag_deprecated()) {
3582 // Check for Deprecated tag - 4276120
3583 if (attribute_length != 0) {
3584 classfile_parse_error(
3585 "Invalid Deprecated classfile attribute length %u in class file %s",
3586 attribute_length, THREAD);
3587 return;
3588 }
3589 } else if (_major_version >= JAVA_1_5_VERSION) {
3590 if (tag == vmSymbols::tag_signature()) {
3591 if (_generic_signature_index != 0) {
3592 classfile_parse_error(
3593 "Multiple Signature attributes in class file %s", THREAD);
3594 return;
3595 }
3596 if (attribute_length != 2) {
3597 classfile_parse_error(
3598 "Wrong Signature attribute length %u in class file %s",
3599 attribute_length, THREAD);
3600 return;
3601 }
3602 parse_classfile_signature_attribute(cfs, CHECK);
3603 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3604 if (runtime_visible_annotations != nullptr) {
3605 classfile_parse_error(
3606 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3607 return;
3608 }
3609 runtime_visible_annotations_length = attribute_length;
3610 runtime_visible_annotations = cfs->current();
3611 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3612 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3613 parse_annotations(cp,
3614 runtime_visible_annotations,
3615 runtime_visible_annotations_length,
3616 parsed_annotations,
3617 _loader_data,
3618 _can_access_vm_annotations);
3619 cfs->skip_u1_fast(runtime_visible_annotations_length);
3620 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3621 if (runtime_invisible_annotations_exists) {
3622 classfile_parse_error(
3623 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3624 return;
3625 }
3626 runtime_invisible_annotations_exists = true;
3627 cfs->skip_u1(attribute_length, CHECK);
3628 } else if (tag == vmSymbols::tag_enclosing_method()) {
3629 if (parsed_enclosingmethod_attribute) {
3630 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3631 return;
3632 } else {
3633 parsed_enclosingmethod_attribute = true;
3634 }
3635 guarantee_property(attribute_length == 4,
3636 "Wrong EnclosingMethod attribute length %u in class file %s",
3637 attribute_length, CHECK);
3638 cfs->guarantee_more(4, CHECK); // class_index, method_index
3639 enclosing_method_class_index = cfs->get_u2_fast();
3640 enclosing_method_method_index = cfs->get_u2_fast();
3641 if (enclosing_method_class_index == 0) {
3642 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3643 return;
3644 }
3645 // Validate the constant pool indices and types
3646 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3647 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3648 if (enclosing_method_method_index != 0 &&
3649 (!cp->is_within_bounds(enclosing_method_method_index) ||
3650 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3651 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3652 return;
3653 }
3654 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3655 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3656 if (parsed_bootstrap_methods_attribute) {
3657 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3658 return;
3659 }
3660 parsed_bootstrap_methods_attribute = true;
3661 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3662 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3663 if (runtime_visible_type_annotations != nullptr) {
3664 classfile_parse_error(
3665 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3666 return;
3667 }
3668 runtime_visible_type_annotations_length = attribute_length;
3669 runtime_visible_type_annotations = cfs->current();
3670 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3671 // No need for the VM to parse Type annotations
3672 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3673 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3674 if (runtime_invisible_type_annotations_exists) {
3675 classfile_parse_error(
3676 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3677 return;
3678 }
3679 runtime_invisible_type_annotations_exists = true;
3680 cfs->skip_u1(attribute_length, CHECK);
3681 } else if (_major_version >= JAVA_11_VERSION) {
3682 if (tag == vmSymbols::tag_nest_members()) {
3683 // Check for NestMembers tag
3684 if (parsed_nest_members_attribute) {
3685 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3686 return;
3687 } else {
3688 parsed_nest_members_attribute = true;
3689 }
3690 if (parsed_nest_host_attribute) {
3691 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3692 return;
3693 }
3694 nest_members_attribute_start = cfs->current();
3695 nest_members_attribute_length = attribute_length;
3696 cfs->skip_u1(nest_members_attribute_length, CHECK);
3697 } else if (tag == vmSymbols::tag_nest_host()) {
3698 if (parsed_nest_host_attribute) {
3699 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3700 return;
3701 } else {
3702 parsed_nest_host_attribute = true;
3703 }
3704 if (parsed_nest_members_attribute) {
3705 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3706 return;
3707 }
3708 if (_need_verify) {
3709 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3710 }
3711 cfs->guarantee_more(2, CHECK);
3712 u2 class_info_index = cfs->get_u2_fast();
3713 guarantee_property(
3714 valid_klass_reference_at(class_info_index),
3715 "Nest-host class_info_index %u has bad constant type in class file %s",
3716 class_info_index, CHECK);
3717 _nest_host = class_info_index;
3718
3719 } else if (_major_version >= JAVA_16_VERSION) {
3720 if (tag == vmSymbols::tag_record()) {
3721 if (parsed_record_attribute) {
3722 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3723 return;
3724 }
3725 parsed_record_attribute = true;
3726 record_attribute_start = cfs->current();
3727 record_attribute_length = attribute_length;
3728 } else if (_major_version >= JAVA_17_VERSION) {
3729 if (tag == vmSymbols::tag_permitted_subclasses()) {
3730 if (parsed_permitted_subclasses_attribute) {
3731 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3732 return;
3733 }
3734 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3735 if (_access_flags.is_final()) {
3736 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3737 return;
3738 }
3739 parsed_permitted_subclasses_attribute = true;
3740 permitted_subclasses_attribute_start = cfs->current();
3741 permitted_subclasses_attribute_length = attribute_length;
3742 }
3743 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3744 if (parsed_loadable_descriptors_attribute) {
3745 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3746 return;
3747 }
3748 parsed_loadable_descriptors_attribute = true;
3749 loadable_descriptors_attribute_start = cfs->current();
3750 loadable_descriptors_attribute_length = attribute_length;
3751 }
3752 }
3753 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3754 cfs->skip_u1(attribute_length, CHECK);
3755 } else {
3756 // Unknown attribute
3757 cfs->skip_u1(attribute_length, CHECK);
3758 }
3759 } else {
3760 // Unknown attribute
3761 cfs->skip_u1(attribute_length, CHECK);
3762 }
3763 } else {
3764 // Unknown attribute
3765 cfs->skip_u1(attribute_length, CHECK);
3766 }
3767 }
3768 _class_annotations = allocate_annotations(runtime_visible_annotations,
3769 runtime_visible_annotations_length,
3770 CHECK);
3771 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3772 runtime_visible_type_annotations_length,
3773 CHECK);
3774
3775 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3776 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3777 cfs,
3778 cp,
3779 inner_classes_attribute_start,
3780 parsed_innerclasses_attribute,
3781 enclosing_method_class_index,
3782 enclosing_method_method_index,
3783 CHECK);
3784 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3785 guarantee_property(
3786 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3787 "Wrong InnerClasses attribute length in class file %s", CHECK);
3788 }
3789 }
3790
3791 if (parsed_nest_members_attribute) {
3792 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3793 cfs,
3794 nest_members_attribute_start,
3795 CHECK);
3796 if (_need_verify) {
3797 guarantee_property(
3798 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3799 "Wrong NestMembers attribute length in class file %s", CHECK);
3800 }
3801 }
3802
3803 if (parsed_record_attribute) {
3804 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3805 cfs,
3806 cp,
3807 record_attribute_start,
3808 CHECK);
3809 if (_need_verify) {
3810 guarantee_property(record_attribute_length == calculated_attr_length,
3811 "Record attribute has wrong length in class file %s",
3812 CHECK);
3813 }
3814 }
3815
3816 if (parsed_permitted_subclasses_attribute) {
3817 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3818 cfs,
3819 permitted_subclasses_attribute_start,
3820 CHECK);
3821 if (_need_verify) {
3822 guarantee_property(
3823 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3824 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3825 }
3826 }
3827
3828 if (parsed_loadable_descriptors_attribute) {
3829 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3830 cfs,
3831 loadable_descriptors_attribute_start,
3832 CHECK);
3833 if (_need_verify) {
3834 guarantee_property(
3835 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3836 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3837 }
3838 }
3839
3840 if (_max_bootstrap_specifier_index >= 0) {
3841 guarantee_property(parsed_bootstrap_methods_attribute,
3842 "Missing BootstrapMethods attribute in class file %s", CHECK);
3843 }
3844 }
3845
3846 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3847 assert(k != nullptr, "invariant");
3848
3849 if (_synthetic_flag)
3850 k->set_is_synthetic();
3851 if (_sourcefile_index != 0) {
3852 k->set_source_file_name_index(_sourcefile_index);
3853 }
3854 if (_generic_signature_index != 0) {
3855 k->set_generic_signature_index(_generic_signature_index);
3856 }
3857 if (_sde_buffer != nullptr) {
3858 k->set_source_debug_extension(_sde_buffer, _sde_length);
3859 }
3860 }
3861
3862 // Create the Annotations object that will
3863 // hold the annotations array for the Klass.
3864 void ClassFileParser::create_combined_annotations(TRAPS) {
3865 if (_class_annotations == nullptr &&
3866 _class_type_annotations == nullptr &&
3867 _fields_annotations == nullptr &&
3868 _fields_type_annotations == nullptr) {
3869 // Don't create the Annotations object unnecessarily.
3870 return;
3871 }
3872
3873 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3874 annotations->set_class_annotations(_class_annotations);
3875 annotations->set_class_type_annotations(_class_type_annotations);
3876 annotations->set_fields_annotations(_fields_annotations);
3877 annotations->set_fields_type_annotations(_fields_type_annotations);
3878
3879 // This is the Annotations object that will be
3880 // assigned to InstanceKlass being constructed.
3881 _combined_annotations = annotations;
3882
3883 // The annotations arrays below has been transferred the
3884 // _combined_annotations so these fields can now be cleared.
3885 _class_annotations = nullptr;
3886 _class_type_annotations = nullptr;
3887 _fields_annotations = nullptr;
3888 _fields_type_annotations = nullptr;
3889 }
3890
3891 // Transfer ownership of metadata allocated to the InstanceKlass.
3892 void ClassFileParser::apply_parsed_class_metadata(
3893 InstanceKlass* this_klass,
3894 int java_fields_count) {
3895 assert(this_klass != nullptr, "invariant");
3896
3897 _cp->set_pool_holder(this_klass);
3898 this_klass->set_constants(_cp);
3899 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3900 this_klass->set_fields_status(_fields_status);
3901 this_klass->set_methods(_methods);
3902 this_klass->set_inner_classes(_inner_classes);
3903 this_klass->set_nest_members(_nest_members);
3904 this_klass->set_nest_host_index(_nest_host);
3905 this_klass->set_loadable_descriptors(_loadable_descriptors);
3906 this_klass->set_annotations(_combined_annotations);
3907 this_klass->set_permitted_subclasses(_permitted_subclasses);
3908 this_klass->set_record_components(_record_components);
3909 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3910
3911 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3912 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3913 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3914 // its _super. If an OOM occurs while loading the current klass, its _super field
3915 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3916 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3917 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3918
3919 // Clear out these fields so they don't get deallocated by the destructor
3920 clear_class_metadata();
3921 }
3922
3923 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3924 int anno_length,
3925 TRAPS) {
3926 AnnotationArray* annotations = nullptr;
3927 if (anno != nullptr) {
3928 annotations = MetadataFactory::new_array<u1>(_loader_data,
3929 anno_length,
3930 CHECK_(annotations));
3931 for (int i = 0; i < anno_length; i++) {
3932 annotations->at_put(i, anno[i]);
3933 }
3934 }
3935 return annotations;
3936 }
3937
3938 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3939 const int super_class_index,
3940 const bool need_verify,
3941 TRAPS) {
3942 assert(cp != nullptr, "invariant");
3943 const InstanceKlass* super_klass = nullptr;
3944
3945 if (super_class_index == 0) {
3946 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3947 "Invalid superclass index 0 in class file %s",
3948 CHECK_NULL);
3949 } else {
3950 guarantee_property(valid_klass_reference_at(super_class_index),
3951 "Invalid superclass index %u in class file %s",
3952 super_class_index,
3953 CHECK_NULL);
3954 // The class name should be legal because it is checked when parsing constant pool.
3955 // However, make sure it is not an array type.
3956 if (cp->tag_at(super_class_index).is_klass()) {
3957 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3958 }
3959 if (need_verify) {
3960 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3961 guarantee_property(!is_array,
3962 "Bad superclass name in class file %s", CHECK_NULL);
3963 }
3964 }
3965 return super_klass;
3966 }
3967
3968 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3969 _max_nonstatic_oop_maps = max_blocks;
3970 _nonstatic_oop_map_count = 0;
3971 if (max_blocks == 0) {
3972 _nonstatic_oop_maps = nullptr;
3973 } else {
3974 _nonstatic_oop_maps =
3975 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3976 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3977 }
3978 }
3979
3980 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3981 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3982 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3983 }
3984
3985 // addition of super oop maps
3986 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3987 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3988 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3989
3990 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3991 _nonstatic_oop_map_count += nof_blocks;
3992 }
3993
3994 // collection of oops
3995 void OopMapBlocksBuilder::add(int offset, int count) {
3996 if (_nonstatic_oop_map_count == 0) {
3997 _nonstatic_oop_map_count++;
3998 }
3999 OopMapBlock* nonstatic_oop_map = last_oop_map();
4000 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4001 nonstatic_oop_map->set_offset(offset);
4002 nonstatic_oop_map->set_count(count);
4003 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4004 nonstatic_oop_map->increment_count(count);
4005 } else { // Need a new one...
4006 _nonstatic_oop_map_count++;
4007 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4008 nonstatic_oop_map = last_oop_map();
4009 nonstatic_oop_map->set_offset(offset);
4010 nonstatic_oop_map->set_count(count);
4011 }
4012 }
4013
4014 // general purpose copy, e.g. into allocated instanceKlass
4015 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4016 if (_nonstatic_oop_map_count != 0) {
4017 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4018 }
4019 }
4020
4021 // Sort and compact adjacent blocks
4022 void OopMapBlocksBuilder::compact() {
4023 if (_nonstatic_oop_map_count <= 1) {
4024 return;
4025 }
4026 /*
4027 * Since field layout sneaks in oops before values, we will be able to condense
4028 * blocks. There is potential to compact between super, own refs and values
4029 * containing refs.
4030 *
4031 * Currently compaction is slightly limited due to values being 8 byte aligned.
4032 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4033 * and maybe it doesn't need to be.
4034 */
4035 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4036 (_sort_Fn)OopMapBlock::compare_offset);
4037 if (_nonstatic_oop_map_count < 2) {
4038 return;
4039 }
4040
4041 // Make a temp copy, and iterate through and copy back into the original
4042 ResourceMark rm;
4043 OopMapBlock* oop_maps_copy =
4044 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4045 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4046 copy(oop_maps_copy);
4047 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4048 unsigned int new_count = 1;
4049 oop_maps_copy++;
4050 while(oop_maps_copy < oop_maps_copy_end) {
4051 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4052 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4053 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4054 } else {
4055 nonstatic_oop_map++;
4056 new_count++;
4057 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4058 nonstatic_oop_map->set_count(oop_maps_copy->count());
4059 }
4060 oop_maps_copy++;
4061 }
4062 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4063 _nonstatic_oop_map_count = new_count;
4064 }
4065
4066 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4067 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4068 if (_nonstatic_oop_map_count > 0) {
4069 OopMapBlock* map = _nonstatic_oop_maps;
4070 OopMapBlock* last_map = last_oop_map();
4071 assert(map <= last_map, "Last less than first");
4072 while (map <= last_map) {
4073 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4074 map->offset() + map->offset_span() - heapOopSize, map->count());
4075 map++;
4076 }
4077 }
4078 }
4079
4080 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4081 print_on(st);
4082 }
4083
4084 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4085 assert(ik != nullptr, "invariant");
4086
4087 const InstanceKlass* const super = ik->java_super();
4088
4089 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4090 // in which case we don't have to register objects as finalizable
4091 if (!_has_empty_finalizer) {
4092 if (_has_finalizer ||
4093 (super != nullptr && super->has_finalizer())) {
4094 ik->set_has_finalizer();
4095 }
4096 }
4097
4098 #ifdef ASSERT
4099 bool f = false;
4100 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4101 vmSymbols::void_method_signature());
4102 if (InstanceKlass::is_finalization_enabled() &&
4103 (m != nullptr) && !m->is_empty_method()) {
4104 f = true;
4105 }
4106
4107 // Spec doesn't prevent agent from redefinition of empty finalizer.
4108 // Despite the fact that it's generally bad idea and redefined finalizer
4109 // will not work as expected we shouldn't abort vm in this case
4110 if (!ik->has_redefined_this_or_super()) {
4111 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4112 }
4113 #endif
4114
4115 // Check if this klass supports the java.lang.Cloneable interface
4116 if (vmClasses::Cloneable_klass_loaded()) {
4117 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4118 ik->set_is_cloneable();
4119 }
4120 }
4121
4122 // If it cannot be fast-path allocated, set a bit in the layout helper.
4123 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4124 assert(ik->size_helper() > 0, "layout_helper is initialized");
4125 if (ik->is_abstract() || ik->is_interface()
4126 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4127 || ik->size_helper() >= FastAllocateSizeLimit) {
4128 // Forbid fast-path allocation.
4129 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4130 ik->set_layout_helper(lh);
4131 }
4132 }
4133
4134 bool ClassFileParser::supports_inline_types() const {
4135 // Inline types are only supported by class file version 69.65535 and later
4136 return _major_version > JAVA_25_VERSION ||
4137 (_major_version == JAVA_25_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4138 }
4139
4140 // utility methods for appending an array with check for duplicates
4141
4142 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4143 const Array<InstanceKlass*>* const ifs) {
4144 // iterate over new interfaces
4145 for (int i = 0; i < ifs->length(); i++) {
4146 InstanceKlass* const e = ifs->at(i);
4147 assert(e->is_klass() && e->is_interface(), "just checking");
4148 // add new interface
4149 result->append_if_missing(e);
4150 }
4151 }
4152
4153 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4154 Array<InstanceKlass*>* local_ifs,
4155 ClassLoaderData* loader_data,
4156 TRAPS) {
4157 assert(local_ifs != nullptr, "invariant");
4158 assert(loader_data != nullptr, "invariant");
4159
4160 // Compute maximum size for transitive interfaces
4161 int max_transitive_size = 0;
4162 int super_size = 0;
4163 // Add superclass transitive interfaces size
4164 if (super != nullptr) {
4165 super_size = super->transitive_interfaces()->length();
4166 max_transitive_size += super_size;
4167 }
4168 // Add local interfaces' super interfaces
4169 const int local_size = local_ifs->length();
4170 for (int i = 0; i < local_size; i++) {
4171 InstanceKlass* const l = local_ifs->at(i);
4172 max_transitive_size += l->transitive_interfaces()->length();
4173 }
4174 // Finally add local interfaces
4175 max_transitive_size += local_size;
4176 // Construct array
4177 if (max_transitive_size == 0) {
4178 // no interfaces, use canonicalized array
4179 return Universe::the_empty_instance_klass_array();
4180 } else if (max_transitive_size == super_size) {
4181 // no new local interfaces added, share superklass' transitive interface array
4182 return super->transitive_interfaces();
4183 // The three lines below are commented to work around bug JDK-8245487
4184 // } else if (max_transitive_size == local_size) {
4185 // // only local interfaces added, share local interface array
4186 // return local_ifs;
4187 } else {
4188 ResourceMark rm;
4189 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4190
4191 // Copy down from superclass
4192 if (super != nullptr) {
4193 append_interfaces(result, super->transitive_interfaces());
4194 }
4195
4196 // Copy down from local interfaces' superinterfaces
4197 for (int i = 0; i < local_size; i++) {
4198 InstanceKlass* const l = local_ifs->at(i);
4199 append_interfaces(result, l->transitive_interfaces());
4200 }
4201 // Finally add local interfaces
4202 append_interfaces(result, local_ifs);
4203
4204 // length will be less than the max_transitive_size if duplicates were removed
4205 const int length = result->length();
4206 assert(length <= max_transitive_size, "just checking");
4207
4208 Array<InstanceKlass*>* const new_result =
4209 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4210 for (int i = 0; i < length; i++) {
4211 InstanceKlass* const e = result->at(i);
4212 assert(e != nullptr, "just checking");
4213 new_result->at_put(i, e);
4214 }
4215 return new_result;
4216 }
4217 }
4218
4219 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4220 assert(this_klass != nullptr, "invariant");
4221 const Klass* const super = this_klass->super();
4222
4223 if (super != nullptr) {
4224 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4225
4226 if (super->is_final()) {
4227 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4228 return;
4229 }
4230
4231 if (super_ik->is_sealed()) {
4232 stringStream ss;
4233 ResourceMark rm(THREAD);
4234 if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
4235 classfile_icce_error(ss.as_string(), THREAD);
4236 return;
4237 }
4238 }
4239
4240 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4241 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4242 // for a value classes. So, it is treated as a special case for now.
4243 if (!this_klass->access_flags().is_identity_class() &&
4244 super_ik->name() != vmSymbols::java_lang_Object() &&
4245 super_ik->is_identity_class()) {
4246 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4247 return;
4248 }
4249
4250 Reflection::VerifyClassAccessResults vca_result =
4251 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4252 if (vca_result != Reflection::ACCESS_OK) {
4253 ResourceMark rm(THREAD);
4254 char* msg = Reflection::verify_class_access_msg(this_klass,
4255 InstanceKlass::cast(super),
4256 vca_result);
4257
4258 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4259 if (msg == nullptr) {
4260 bool same_module = (this_klass->module() == super->module());
4261 Exceptions::fthrow(
4262 THREAD_AND_LOCATION,
4263 vmSymbols::java_lang_IllegalAccessError(),
4264 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4265 this_klass->external_name(),
4266 super->is_abstract() ? "abstract " : "",
4267 super->external_name(),
4268 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4269 (same_module) ? "" : "; ",
4270 (same_module) ? "" : super->class_in_module_of_loader());
4271 } else {
4272 // Add additional message content.
4273 Exceptions::fthrow(
4274 THREAD_AND_LOCATION,
4275 vmSymbols::java_lang_IllegalAccessError(),
4276 "superclass access check failed: %s",
4277 msg);
4278 }
4279 }
4280 }
4281 }
4282
4283
4284 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4285 assert(this_klass != nullptr, "invariant");
4286 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4287 const int lng = local_interfaces->length();
4288 for (int i = lng - 1; i >= 0; i--) {
4289 InstanceKlass* const k = local_interfaces->at(i);
4290 assert (k != nullptr && k->is_interface(), "invalid interface");
4291
4292 if (k->is_sealed()) {
4293 stringStream ss;
4294 ResourceMark rm(THREAD);
4295 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4296 classfile_icce_error(ss.as_string(), THREAD);
4297 return;
4298 }
4299 }
4300
4301 Reflection::VerifyClassAccessResults vca_result =
4302 Reflection::verify_class_access(this_klass, k, false);
4303 if (vca_result != Reflection::ACCESS_OK) {
4304 ResourceMark rm(THREAD);
4305 char* msg = Reflection::verify_class_access_msg(this_klass,
4306 k,
4307 vca_result);
4308
4309 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4310 if (msg == nullptr) {
4311 bool same_module = (this_klass->module() == k->module());
4312 Exceptions::fthrow(
4313 THREAD_AND_LOCATION,
4314 vmSymbols::java_lang_IllegalAccessError(),
4315 "class %s cannot access its superinterface %s (%s%s%s)",
4316 this_klass->external_name(),
4317 k->external_name(),
4318 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4319 (same_module) ? "" : "; ",
4320 (same_module) ? "" : k->class_in_module_of_loader());
4321 return;
4322 } else {
4323 // Add additional message content.
4324 Exceptions::fthrow(
4325 THREAD_AND_LOCATION,
4326 vmSymbols::java_lang_IllegalAccessError(),
4327 "superinterface check failed: %s",
4328 msg);
4329 return;
4330 }
4331 }
4332 }
4333 }
4334
4335
4336 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4337 assert(this_klass != nullptr, "invariant");
4338 const Array<Method*>* const methods = this_klass->methods();
4339 const int num_methods = methods->length();
4340
4341 // go thru each method and check if it overrides a final method
4342 for (int index = 0; index < num_methods; index++) {
4343 const Method* const m = methods->at(index);
4344
4345 // skip private, static, and <init> methods
4346 if ((!m->is_private() && !m->is_static()) &&
4347 (m->name() != vmSymbols::object_initializer_name())) {
4348
4349 const Symbol* const name = m->name();
4350 const Symbol* const signature = m->signature();
4351 const InstanceKlass* k = this_klass->java_super();
4352 const Method* super_m = nullptr;
4353 while (k != nullptr) {
4354 // skip supers that don't have final methods.
4355 if (k->has_final_method()) {
4356 // lookup a matching method in the super class hierarchy
4357 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4358 if (super_m == nullptr) {
4359 break; // didn't find any match; get out
4360 }
4361
4362 if (super_m->is_final() && !super_m->is_static() &&
4363 !super_m->access_flags().is_private()) {
4364 // matching method in super is final, and not static or private
4365 bool can_access = Reflection::verify_member_access(this_klass,
4366 super_m->method_holder(),
4367 super_m->method_holder(),
4368 super_m->access_flags(),
4369 false, false, CHECK);
4370 if (can_access) {
4371 // this class can access super final method and therefore override
4372 ResourceMark rm(THREAD);
4373 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4374 err_msg("class %s overrides final method %s.%s%s",
4375 this_klass->external_name(),
4376 super_m->method_holder()->external_name(),
4377 name->as_C_string(),
4378 signature->as_C_string()));
4379 }
4380 }
4381
4382 // continue to look from super_m's holder's super.
4383 k = super_m->method_holder()->java_super();
4384 continue;
4385 }
4386
4387 k = k->java_super();
4388 }
4389 }
4390 }
4391 }
4392
4393
4394 // assumes that this_klass is an interface
4395 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4396 assert(this_klass != nullptr, "invariant");
4397 assert(this_klass->is_interface(), "not an interface");
4398 const Array<Method*>* methods = this_klass->methods();
4399 const int num_methods = methods->length();
4400
4401 for (int index = 0; index < num_methods; index++) {
4402 const Method* const m = methods->at(index);
4403 // if m is static and not the init method, throw a verify error
4404 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4405 ResourceMark rm(THREAD);
4406
4407 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4408 Exceptions::fthrow(
4409 THREAD_AND_LOCATION,
4410 vmSymbols::java_lang_VerifyError(),
4411 "Illegal static method %s in interface %s",
4412 m->name()->as_C_string(),
4413 this_klass->external_name()
4414 );
4415 return;
4416 }
4417 }
4418 }
4419
4420 // utility methods for format checking
4421
4422 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4423 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4424 const bool is_inner_class = name != nullptr;
4425 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4426 if (is_module) {
4427 ResourceMark rm(THREAD);
4428 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4429 Exceptions::fthrow(
4430 THREAD_AND_LOCATION,
4431 vmSymbols::java_lang_NoClassDefFoundError(),
4432 "%s is not a class because access_flag ACC_MODULE is set",
4433 _class_name->as_C_string());
4434 return;
4435 }
4436
4437 if (!_need_verify) { return; }
4438
4439 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4440 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4441 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4442 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4443 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4444 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4445 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4446 const bool valid_value_class = is_identity || is_interface ||
4447 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4448
4449 if ((is_abstract && is_final) ||
4450 (is_interface && !is_abstract) ||
4451 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4452 (!is_interface && major_gte_1_5 && is_annotation) ||
4453 (!valid_value_class)) {
4454 ResourceMark rm(THREAD);
4455 const char* class_note = "";
4456 if (!valid_value_class) {
4457 class_note = " (a value class must be final or else abstract)";
4458 }
4459 if (name == nullptr) { // Not an inner class
4460 Exceptions::fthrow(
4461 THREAD_AND_LOCATION,
4462 vmSymbols::java_lang_ClassFormatError(),
4463 "Illegal class modifiers in class %s%s: 0x%X",
4464 _class_name->as_C_string(), class_note, flags
4465 );
4466 return;
4467 } else {
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_ClassFormatError(),
4472 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4473 name, class_note, _class_name->as_C_string(), flags
4474 );
4475 return;
4476 }
4477 }
4478 }
4479
4480 static bool has_illegal_visibility(jint flags) {
4481 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4482 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4483 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4484
4485 return ((is_public && is_protected) ||
4486 (is_public && is_private) ||
4487 (is_protected && is_private));
4488 }
4489
4490 // A legal major_version.minor_version must be one of the following:
4491 //
4492 // Major_version >= 45 and major_version < 56, any minor_version.
4493 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4494 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4495 //
4496 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4497 ResourceMark rm(THREAD);
4498 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4499 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4500 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4501 class_name, major, minor, THREAD);
4502 return;
4503 }
4504
4505 if (major > max_version) {
4506 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4507 Exceptions::fthrow(
4508 THREAD_AND_LOCATION,
4509 vmSymbols::java_lang_UnsupportedClassVersionError(),
4510 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4511 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4512 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4513 return;
4514 }
4515
4516 if (major < JAVA_12_VERSION || minor == 0) {
4517 return;
4518 }
4519
4520 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4521 if (major != max_version) {
4522 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4523 Exceptions::fthrow(
4524 THREAD_AND_LOCATION,
4525 vmSymbols::java_lang_UnsupportedClassVersionError(),
4526 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4527 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4528 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4529 return;
4530 }
4531
4532 if (!Arguments::enable_preview()) {
4533 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4534 class_name, major, minor, THREAD);
4535 return;
4536 }
4537
4538 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4539 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4540 class_name, major, minor, THREAD);
4541 }
4542 }
4543
4544 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4545 AccessFlags class_access_flags,
4546 TRAPS) const {
4547 if (!_need_verify) { return; }
4548
4549 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4550 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4551 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4552 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4553 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4554 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4555 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4556 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4557 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4558 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4559
4560 const bool is_interface = class_access_flags.is_interface();
4561 const bool is_identity_class = class_access_flags.is_identity_class();
4562
4563 bool is_illegal = false;
4564 const char* error_msg = "";
4565
4566 // There is some overlap in the checks that apply, for example interface fields
4567 // must be static, static fields can't be strict, and therefore interfaces can't
4568 // have strict fields. So we don't have to check every possible invalid combination
4569 // individually as long as all are covered. Once we have found an illegal combination
4570 // we can stop checking.
4571
4572 if (!is_illegal) {
4573 if (is_interface) {
4574 if (!is_public || !is_static || !is_final || is_private ||
4575 is_protected || is_volatile || is_transient ||
4576 (major_gte_1_5 && is_enum)) {
4577 is_illegal = true;
4578 error_msg = "interface fields must be public, static and final, and may be synthetic";
4579 }
4580 } else { // not interface
4581 if (has_illegal_visibility(flags)) {
4582 is_illegal = true;
4583 error_msg = "invalid visibility flags for class field";
4584 } else if (is_final && is_volatile) {
4585 is_illegal = true;
4586 error_msg = "fields cannot be final and volatile";
4587 } else if (supports_inline_types()) {
4588 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4589 is_illegal = true;
4590 error_msg = "value class fields must be either non-static final and strict, or static";
4591 }
4592 }
4593 }
4594 }
4595
4596 if (is_illegal) {
4597 ResourceMark rm(THREAD);
4598 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4599 Exceptions::fthrow(
4600 THREAD_AND_LOCATION,
4601 vmSymbols::java_lang_ClassFormatError(),
4602 "Illegal field modifiers (%s) in class %s: 0x%X",
4603 error_msg, _class_name->as_C_string(), flags);
4604 return;
4605 }
4606 }
4607
4608 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4609 AccessFlags class_access_flags,
4610 const Symbol* name,
4611 TRAPS) const {
4612 if (!_need_verify) { return; }
4613
4614 const bool is_public = (flags & JVM_ACC_PUBLIC) != 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_native = (flags & JVM_ACC_NATIVE) != 0;
4619 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4620 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4621 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4622 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4623 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4624 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4625 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4626 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4627 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4628 // LW401 CR required: removal of value factories support
4629 const bool is_interface = class_access_flags.is_interface();
4630 const bool is_identity_class = class_access_flags.is_identity_class();
4631 const bool is_abstract_class = class_access_flags.is_abstract();
4632
4633 bool is_illegal = false;
4634
4635 const char* class_note = "";
4636 if (is_interface) {
4637 if (major_gte_8) {
4638 // Class file version is JAVA_8_VERSION or later Methods of
4639 // interfaces may set any of the flags except ACC_PROTECTED,
4640 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4641 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4642 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4643 (is_native || is_protected || is_final || is_synchronized) ||
4644 // If a specific method of a class or interface has its
4645 // ACC_ABSTRACT flag set, it must not have any of its
4646 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4647 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4648 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4649 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4650 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4651 is_illegal = true;
4652 }
4653 } else if (major_gte_1_5) {
4654 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4655 if (!is_public || is_private || is_protected || is_static || is_final ||
4656 is_synchronized || is_native || !is_abstract || is_strict) {
4657 is_illegal = true;
4658 }
4659 } else {
4660 // Class file version is pre-JAVA_1_5_VERSION
4661 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4662 is_illegal = true;
4663 }
4664 }
4665 } else { // not interface
4666 if (has_illegal_visibility(flags)) {
4667 is_illegal = true;
4668 } else {
4669 if (is_initializer) {
4670 if (is_static || is_final || is_synchronized || is_native ||
4671 is_abstract || (major_gte_1_5 && is_bridge)) {
4672 is_illegal = true;
4673 }
4674 } else { // not initializer
4675 if (!is_identity_class && is_synchronized && !is_static) {
4676 is_illegal = true;
4677 class_note = " (not an identity class)";
4678 } else {
4679 if (is_abstract) {
4680 if ((is_final || is_native || is_private || is_static ||
4681 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4682 is_illegal = true;
4683 }
4684 }
4685 }
4686 }
4687 }
4688 }
4689
4690 if (is_illegal) {
4691 ResourceMark rm(THREAD);
4692 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4693 Exceptions::fthrow(
4694 THREAD_AND_LOCATION,
4695 vmSymbols::java_lang_ClassFormatError(),
4696 "Method %s in class %s%s has illegal modifiers: 0x%X",
4697 name->as_C_string(), _class_name->as_C_string(),
4698 class_note, flags);
4699 return;
4700 }
4701 }
4702
4703 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4704 int length,
4705 TRAPS) const {
4706 assert(_need_verify, "only called when _need_verify is true");
4707 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4708 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4709 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4710 }
4711 }
4712
4713 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4714 // In class names, '/' separates unqualified names. This is verified in this function also.
4715 // Method names also may not contain the characters '<' or '>', unless <init>
4716 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4717 // method. Because these names have been checked as special cases before
4718 // calling this method in verify_legal_method_name.
4719 //
4720 // This method is also called from the modular system APIs in modules.cpp
4721 // to verify the validity of module and package names.
4722 bool ClassFileParser::verify_unqualified_name(const char* name,
4723 unsigned int length,
4724 int type) {
4725 if (length == 0) return false; // Must have at least one char.
4726 for (const char* p = name; p != name + length; p++) {
4727 switch(*p) {
4728 case JVM_SIGNATURE_DOT:
4729 case JVM_SIGNATURE_ENDCLASS:
4730 case JVM_SIGNATURE_ARRAY:
4731 // do not permit '.', ';', or '['
4732 return false;
4733 case JVM_SIGNATURE_SLASH:
4734 // check for '//' or leading or trailing '/' which are not legal
4735 // unqualified name must not be empty
4736 if (type == ClassFileParser::LegalClass) {
4737 if (p == name || p+1 >= name+length ||
4738 *(p+1) == JVM_SIGNATURE_SLASH) {
4739 return false;
4740 }
4741 } else {
4742 return false; // do not permit '/' unless it's class name
4743 }
4744 break;
4745 case JVM_SIGNATURE_SPECIAL:
4746 case JVM_SIGNATURE_ENDSPECIAL:
4747 // do not permit '<' or '>' in method names
4748 if (type == ClassFileParser::LegalMethod) {
4749 return false;
4750 }
4751 }
4752 }
4753 return true;
4754 }
4755
4756 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4757 if (_loadable_descriptors == nullptr) return false;
4758 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4759 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4760 if (class_name == klass) return true;
4761 }
4762 return false;
4763 }
4764
4765 // Take pointer to a UTF8 byte string (not NUL-terminated).
4766 // Skip over the longest part of the string that could
4767 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4768 // Return a pointer to just past the fieldname.
4769 // Return null if no fieldname at all was found, or in the case of slash_ok
4770 // being true, we saw consecutive slashes (meaning we were looking for a
4771 // qualified path but found something that was badly-formed).
4772 static const char* skip_over_field_name(const char* const name,
4773 bool slash_ok,
4774 unsigned int length) {
4775 const char* p;
4776 jboolean last_is_slash = false;
4777 jboolean not_first_ch = false;
4778
4779 for (p = name; p != name + length; not_first_ch = true) {
4780 const char* old_p = p;
4781 jchar ch = *p;
4782 if (ch < 128) {
4783 p++;
4784 // quick check for ascii
4785 if ((ch >= 'a' && ch <= 'z') ||
4786 (ch >= 'A' && ch <= 'Z') ||
4787 (ch == '_' || ch == '$') ||
4788 (not_first_ch && ch >= '0' && ch <= '9')) {
4789 last_is_slash = false;
4790 continue;
4791 }
4792 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4793 if (last_is_slash) {
4794 return nullptr; // Don't permit consecutive slashes
4795 }
4796 last_is_slash = true;
4797 continue;
4798 }
4799 }
4800 else {
4801 jint unicode_ch;
4802 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4803 p = tmp_p;
4804 last_is_slash = false;
4805 // Check if ch is Java identifier start or is Java identifier part
4806 // 4672820: call java.lang.Character methods directly without generating separate tables.
4807 EXCEPTION_MARK;
4808 // return value
4809 JavaValue result(T_BOOLEAN);
4810 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4811 JavaCallArguments args;
4812 args.push_int(unicode_ch);
4813
4814 if (not_first_ch) {
4815 // public static boolean isJavaIdentifierPart(char ch);
4816 JavaCalls::call_static(&result,
4817 vmClasses::Character_klass(),
4818 vmSymbols::isJavaIdentifierPart_name(),
4819 vmSymbols::int_bool_signature(),
4820 &args,
4821 THREAD);
4822 } else {
4823 // public static boolean isJavaIdentifierStart(char ch);
4824 JavaCalls::call_static(&result,
4825 vmClasses::Character_klass(),
4826 vmSymbols::isJavaIdentifierStart_name(),
4827 vmSymbols::int_bool_signature(),
4828 &args,
4829 THREAD);
4830 }
4831 if (HAS_PENDING_EXCEPTION) {
4832 CLEAR_PENDING_EXCEPTION;
4833 return nullptr;
4834 }
4835 if(result.get_jboolean()) {
4836 continue;
4837 }
4838 }
4839 return (not_first_ch) ? old_p : nullptr;
4840 }
4841 return (not_first_ch && !last_is_slash) ? p : nullptr;
4842 }
4843
4844 // Take pointer to a UTF8 byte string (not NUL-terminated).
4845 // Skip over the longest part of the string that could
4846 // be taken as a field signature. Allow "void" if void_ok.
4847 // Return a pointer to just past the signature.
4848 // Return null if no legal signature is found.
4849 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4850 bool void_ok,
4851 unsigned int length,
4852 TRAPS) const {
4853 unsigned int array_dim = 0;
4854 while (length > 0) {
4855 switch (signature[0]) {
4856 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4857 case JVM_SIGNATURE_BOOLEAN:
4858 case JVM_SIGNATURE_BYTE:
4859 case JVM_SIGNATURE_CHAR:
4860 case JVM_SIGNATURE_SHORT:
4861 case JVM_SIGNATURE_INT:
4862 case JVM_SIGNATURE_FLOAT:
4863 case JVM_SIGNATURE_LONG:
4864 case JVM_SIGNATURE_DOUBLE:
4865 return signature + 1;
4866 case JVM_SIGNATURE_CLASS:
4867 {
4868 if (_major_version < JAVA_1_5_VERSION) {
4869 // Skip over the class name if one is there
4870 const char* const p = skip_over_field_name(signature + 1, true, --length);
4871
4872 // The next character better be a semicolon
4873 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4874 return p + 1;
4875 }
4876 }
4877 else {
4878 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4879 signature++;
4880 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4881 // Format check signature
4882 if (c != nullptr) {
4883 int newlen = pointer_delta_as_int(c, (char*) signature);
4884 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4885 if (!legal) {
4886 classfile_parse_error("Class name is empty or contains illegal character "
4887 "in descriptor in class file %s",
4888 THREAD);
4889 return nullptr;
4890 }
4891 return signature + newlen + 1;
4892 }
4893 }
4894 return nullptr;
4895 }
4896 case JVM_SIGNATURE_ARRAY:
4897 array_dim++;
4898 if (array_dim > 255) {
4899 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4900 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4901 return nullptr;
4902 }
4903 // The rest of what's there better be a legal signature
4904 signature++;
4905 length--;
4906 void_ok = false;
4907 break;
4908 default:
4909 return nullptr;
4910 }
4911 }
4912 return nullptr;
4913 }
4914
4915 // Checks if name is a legal class name.
4916 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4917 if (!_need_verify) { return; }
4918
4919 assert(name->refcount() > 0, "symbol must be kept alive");
4920 char* bytes = (char*)name->bytes();
4921 unsigned int length = name->utf8_length();
4922 bool legal = false;
4923
4924 if (length > 0) {
4925 const char* p;
4926 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4927 p = skip_over_field_signature(bytes, false, length, CHECK);
4928 legal = (p != nullptr) && ((p - bytes) == (int)length);
4929 } else if (_major_version < JAVA_1_5_VERSION) {
4930 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4931 p = skip_over_field_name(bytes, true, length);
4932 legal = (p != nullptr) && ((p - bytes) == (int)length);
4933 }
4934 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4935 && bytes[length - 1] == ';' ) {
4936 // Support for L...; descriptors
4937 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4938 } else {
4939 // 4900761: relax the constraints based on JSR202 spec
4940 // Class names may be drawn from the entire Unicode character set.
4941 // Identifiers between '/' must be unqualified names.
4942 // The utf8 string has been verified when parsing cpool entries.
4943 legal = verify_unqualified_name(bytes, length, LegalClass);
4944 }
4945 }
4946 if (!legal) {
4947 ResourceMark rm(THREAD);
4948 assert(_class_name != nullptr, "invariant");
4949 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4950 Exceptions::fthrow(
4951 THREAD_AND_LOCATION,
4952 vmSymbols::java_lang_ClassFormatError(),
4953 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4954 _class_name->as_C_string()
4955 );
4956 return;
4957 }
4958 }
4959
4960 // Checks if name is a legal field name.
4961 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4962 if (!_need_verify) { return; }
4963
4964 char* bytes = (char*)name->bytes();
4965 unsigned int length = name->utf8_length();
4966 bool legal = false;
4967
4968 if (length > 0) {
4969 if (_major_version < JAVA_1_5_VERSION) {
4970 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4971 const char* p = skip_over_field_name(bytes, false, length);
4972 legal = (p != nullptr) && ((p - bytes) == (int)length);
4973 }
4974 } else {
4975 // 4881221: relax the constraints based on JSR202 spec
4976 legal = verify_unqualified_name(bytes, length, LegalField);
4977 }
4978 }
4979
4980 if (!legal) {
4981 ResourceMark rm(THREAD);
4982 assert(_class_name != nullptr, "invariant");
4983 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4984 Exceptions::fthrow(
4985 THREAD_AND_LOCATION,
4986 vmSymbols::java_lang_ClassFormatError(),
4987 "Illegal field name \"%.*s\" in class %s", length, bytes,
4988 _class_name->as_C_string()
4989 );
4990 return;
4991 }
4992 }
4993
4994 // Checks if name is a legal method name.
4995 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4996 if (!_need_verify) { return; }
4997
4998 assert(name != nullptr, "method name is null");
4999 char* bytes = (char*)name->bytes();
5000 unsigned int length = name->utf8_length();
5001 bool legal = false;
5002
5003 if (length > 0) {
5004 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5005 if (name == vmSymbols::object_initializer_name() ||
5006 name == vmSymbols::class_initializer_name()) {
5007 legal = true;
5008 }
5009 } else if (_major_version < JAVA_1_5_VERSION) {
5010 const char* p;
5011 p = skip_over_field_name(bytes, false, length);
5012 legal = (p != nullptr) && ((p - bytes) == (int)length);
5013 } else {
5014 // 4881221: relax the constraints based on JSR202 spec
5015 legal = verify_unqualified_name(bytes, length, LegalMethod);
5016 }
5017 }
5018
5019 if (!legal) {
5020 ResourceMark rm(THREAD);
5021 assert(_class_name != nullptr, "invariant");
5022 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5023 Exceptions::fthrow(
5024 THREAD_AND_LOCATION,
5025 vmSymbols::java_lang_ClassFormatError(),
5026 "Illegal method name \"%.*s\" in class %s", length, bytes,
5027 _class_name->as_C_string()
5028 );
5029 return;
5030 }
5031 }
5032
5033 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5034 const char* const bytes = (const char*)signature->bytes();
5035 const unsigned int length = signature->utf8_length();
5036 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5037
5038 if (p == nullptr || (p - bytes) != (int)length) {
5039 return false;
5040 }
5041 return true;
5042 }
5043
5044 // Checks if signature is a legal field signature.
5045 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5046 const Symbol* signature,
5047 TRAPS) const {
5048 if (!_need_verify) { return; }
5049
5050 const char* const bytes = (const char*)signature->bytes();
5051 const unsigned int length = signature->utf8_length();
5052 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5053
5054 if (p == nullptr || (p - bytes) != (int)length) {
5055 throwIllegalSignature("Field", name, signature, CHECK);
5056 }
5057 }
5058
5059 // Check that the signature is compatible with the method name. For example,
5060 // check that <init> has a void signature.
5061 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5062 const Symbol* signature,
5063 TRAPS) const {
5064 if (!_need_verify) {
5065 return;
5066 }
5067
5068 // Class initializers cannot have args for class format version >= 51.
5069 if (name == vmSymbols::class_initializer_name() &&
5070 signature != vmSymbols::void_method_signature() &&
5071 _major_version >= JAVA_7_VERSION) {
5072 throwIllegalSignature("Method", name, signature, THREAD);
5073 return;
5074 }
5075
5076 int sig_length = signature->utf8_length();
5077 if (name->utf8_length() > 0 &&
5078 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5079 sig_length > 0 &&
5080 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5081 throwIllegalSignature("Method", name, signature, THREAD);
5082 }
5083 }
5084
5085 // Checks if signature is a legal method signature.
5086 // Returns number of parameters
5087 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5088 const Symbol* signature,
5089 TRAPS) const {
5090 if (!_need_verify) {
5091 // make sure caller's args_size will be less than 0 even for non-static
5092 // method so it will be recomputed in compute_size_of_parameters().
5093 return -2;
5094 }
5095
5096 unsigned int args_size = 0;
5097 const char* p = (const char*)signature->bytes();
5098 unsigned int length = signature->utf8_length();
5099 const char* nextp;
5100
5101 // The first character must be a '('
5102 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5103 length--;
5104 // Skip over legal field signatures
5105 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5106 while ((length > 0) && (nextp != nullptr)) {
5107 args_size++;
5108 if (p[0] == 'J' || p[0] == 'D') {
5109 args_size++;
5110 }
5111 length -= pointer_delta_as_int(nextp, p);
5112 p = nextp;
5113 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5114 }
5115 // The first non-signature thing better be a ')'
5116 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5117 length--;
5118 // Now we better just have a return value
5119 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5120 if (nextp && ((int)length == (nextp - p))) {
5121 return args_size;
5122 }
5123 }
5124 }
5125 // Report error
5126 throwIllegalSignature("Method", name, signature, THREAD);
5127 return 0;
5128 }
5129
5130 int ClassFileParser::static_field_size() const {
5131 assert(_layout_info != nullptr, "invariant");
5132 return _layout_info->_static_field_size;
5133 }
5134
5135 int ClassFileParser::total_oop_map_count() const {
5136 assert(_layout_info != nullptr, "invariant");
5137 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5138 }
5139
5140 jint ClassFileParser::layout_size() const {
5141 assert(_layout_info != nullptr, "invariant");
5142 return _layout_info->_instance_size;
5143 }
5144
5145 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5146 const Array<Method*>* methods) {
5147 assert(ik != nullptr, "invariant");
5148 assert(methods != nullptr, "invariant");
5149
5150 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5151 // (We used to do this lazily, but now we query it in Rewriter,
5152 // which is eagerly done for every method, so we might as well do it now,
5153 // when everything is fresh in memory.)
5154 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5155
5156 if (klass_id != vmSymbolID::NO_SID) {
5157 for (int j = 0; j < methods->length(); ++j) {
5158 Method* method = methods->at(j);
5159 method->init_intrinsic_id(klass_id);
5160
5161 if (CheckIntrinsics) {
5162 // Check if an intrinsic is defined for method 'method',
5163 // but the method is not annotated with @IntrinsicCandidate.
5164 if (method->intrinsic_id() != vmIntrinsics::_none &&
5165 !method->intrinsic_candidate()) {
5166 tty->print("Compiler intrinsic is defined for method [%s], "
5167 "but the method is not annotated with @IntrinsicCandidate.%s",
5168 method->name_and_sig_as_C_string(),
5169 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5170 );
5171 tty->cr();
5172 DEBUG_ONLY(vm_exit(1));
5173 }
5174 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5175 // but there is no intrinsic available for it.
5176 if (method->intrinsic_candidate() &&
5177 method->intrinsic_id() == vmIntrinsics::_none) {
5178 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5179 "but no compiler intrinsic is defined for the method.%s",
5180 method->name_and_sig_as_C_string(),
5181 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5182 );
5183 tty->cr();
5184 DEBUG_ONLY(vm_exit(1));
5185 }
5186 }
5187 } // end for
5188
5189 #ifdef ASSERT
5190 if (CheckIntrinsics) {
5191 // Check for orphan methods in the current class. A method m
5192 // of a class C is orphan if an intrinsic is defined for method m,
5193 // but class C does not declare m.
5194 // The check is potentially expensive, therefore it is available
5195 // only in debug builds.
5196
5197 for (auto id : EnumRange<vmIntrinsicID>{}) {
5198 if (vmIntrinsics::_compiledLambdaForm == id) {
5199 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5200 // generated for the JVM from a LambdaForm and therefore no method
5201 // is defined for it.
5202 continue;
5203 }
5204 if (vmIntrinsics::_blackhole == id) {
5205 // The _blackhole intrinsic is a special marker. No explicit method
5206 // is defined for it.
5207 continue;
5208 }
5209
5210 if (vmIntrinsics::class_for(id) == klass_id) {
5211 // Check if the current class contains a method with the same
5212 // name, flags, signature.
5213 bool match = false;
5214 for (int j = 0; j < methods->length(); ++j) {
5215 const Method* method = methods->at(j);
5216 if (method->intrinsic_id() == id) {
5217 match = true;
5218 break;
5219 }
5220 }
5221
5222 if (!match) {
5223 char buf[1000];
5224 tty->print("Compiler intrinsic is defined for method [%s], "
5225 "but the method is not available in class [%s].%s",
5226 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5227 ik->name()->as_C_string(),
5228 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5229 );
5230 tty->cr();
5231 DEBUG_ONLY(vm_exit(1));
5232 }
5233 }
5234 } // end for
5235 } // CheckIntrinsics
5236 #endif // ASSERT
5237 }
5238 }
5239
5240 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5241 const ClassInstanceInfo& cl_inst_info,
5242 TRAPS) {
5243 if (_klass != nullptr) {
5244 return _klass;
5245 }
5246
5247 InstanceKlass* const ik =
5248 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5249
5250 if (is_hidden()) {
5251 mangle_hidden_class_name(ik);
5252 }
5253
5254 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5255
5256 assert(_klass == ik, "invariant");
5257 return ik;
5258 }
5259
5260 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5261 bool changed_by_loadhook,
5262 const ClassInstanceInfo& cl_inst_info,
5263 TRAPS) {
5264 assert(ik != nullptr, "invariant");
5265
5266 // Set name and CLD before adding to CLD
5267 ik->set_class_loader_data(_loader_data);
5268 ik->set_name(_class_name);
5269
5270 // Add all classes to our internal class loader list here,
5271 // including classes in the bootstrap (null) class loader.
5272 const bool publicize = !is_internal();
5273
5274 _loader_data->add_class(ik, publicize);
5275
5276 set_klass_to_deallocate(ik);
5277
5278 assert(_layout_info != nullptr, "invariant");
5279 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5280 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5281 "sanity");
5282
5283 assert(ik->is_instance_klass(), "sanity");
5284 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5285
5286 // Fill in information already parsed
5287 ik->set_should_verify_class(_need_verify);
5288
5289 // Not yet: supers are done below to support the new subtype-checking fields
5290 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5291 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5292
5293 if (_layout_info->_is_naturally_atomic) {
5294 ik->set_is_naturally_atomic();
5295 }
5296
5297 if (_layout_info->_must_be_atomic) {
5298 ik->set_must_be_atomic();
5299 }
5300
5301 ik->set_static_oop_field_count(_static_oop_count);
5302
5303 // this transfers ownership of a lot of arrays from
5304 // the parser onto the InstanceKlass*
5305 apply_parsed_class_metadata(ik, _java_fields_count);
5306 if (ik->is_inline_klass()) {
5307 InlineKlass::cast(ik)->init_fixed_block();
5308 }
5309
5310 // can only set dynamic nest-host after static nest information is set
5311 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5312 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5313 }
5314
5315 // note that is not safe to use the fields in the parser from this point on
5316 assert(nullptr == _cp, "invariant");
5317 assert(nullptr == _fieldinfo_stream, "invariant");
5318 assert(nullptr == _fields_status, "invariant");
5319 assert(nullptr == _methods, "invariant");
5320 assert(nullptr == _inner_classes, "invariant");
5321 assert(nullptr == _nest_members, "invariant");
5322 assert(nullptr == _loadable_descriptors, "invariant");
5323 assert(nullptr == _combined_annotations, "invariant");
5324 assert(nullptr == _record_components, "invariant");
5325 assert(nullptr == _permitted_subclasses, "invariant");
5326 assert(nullptr == _inline_layout_info_array, "invariant");
5327
5328 if (_has_localvariable_table) {
5329 ik->set_has_localvariable_table(true);
5330 }
5331
5332 if (_has_final_method) {
5333 ik->set_has_final_method();
5334 }
5335
5336 ik->copy_method_ordering(_method_ordering, CHECK);
5337 // The InstanceKlass::_methods_jmethod_ids cache
5338 // is managed on the assumption that the initial cache
5339 // size is equal to the number of methods in the class. If
5340 // that changes, then InstanceKlass::idnum_can_increment()
5341 // has to be changed accordingly.
5342 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5343
5344 ik->set_this_class_index(_this_class_index);
5345
5346 if (_is_hidden) {
5347 // _this_class_index is a CONSTANT_Class entry that refers to this
5348 // hidden class itself. If this class needs to refer to its own methods
5349 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5350 // _this_class_index. However, because this class is hidden (it's
5351 // not stored in SystemDictionary), _this_class_index cannot be resolved
5352 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5353 // Therefore, we must eagerly resolve _this_class_index now.
5354 ik->constants()->klass_at_put(_this_class_index, ik);
5355 }
5356
5357 ik->set_minor_version(_minor_version);
5358 ik->set_major_version(_major_version);
5359 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5360 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5361
5362 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5363
5364 // Set PackageEntry for this_klass
5365 oop cl = ik->class_loader();
5366 Handle clh = Handle(THREAD, cl);
5367 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5368 ik->set_package(cld, nullptr, CHECK);
5369
5370 const Array<Method*>* const methods = ik->methods();
5371 assert(methods != nullptr, "invariant");
5372 const int methods_len = methods->length();
5373
5374 check_methods_for_intrinsics(ik, methods);
5375
5376 // Fill in field values obtained by parse_classfile_attributes
5377 if (_parsed_annotations->has_any_annotations()) {
5378 _parsed_annotations->apply_to(ik);
5379 }
5380
5381 apply_parsed_class_attributes(ik);
5382
5383 // Miranda methods
5384 if ((_num_miranda_methods > 0) ||
5385 // if this class introduced new miranda methods or
5386 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5387 // super class exists and this class inherited miranda methods
5388 ) {
5389 ik->set_has_miranda_methods(); // then set a flag
5390 }
5391
5392 // Fill in information needed to compute superclasses.
5393 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5394 ik->set_transitive_interfaces(_transitive_interfaces);
5395 ik->set_local_interfaces(_local_interfaces);
5396 _transitive_interfaces = nullptr;
5397 _local_interfaces = nullptr;
5398
5399 // Initialize itable offset tables
5400 klassItable::setup_itable_offset_table(ik);
5401
5402 // Compute transitive closure of interfaces this class implements
5403 // Do final class setup
5404 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5405 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5406 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5407 }
5408
5409 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5410 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5411 ik->set_has_contended_annotations(true);
5412 }
5413
5414 // Fill in has_finalizer and layout_helper
5415 set_precomputed_flags(ik);
5416
5417 // check if this class can access its super class
5418 check_super_class_access(ik, CHECK);
5419
5420 // check if this class can access its superinterfaces
5421 check_super_interface_access(ik, CHECK);
5422
5423 // check if this class overrides any final method
5424 check_final_method_override(ik, CHECK);
5425
5426 // reject static interface methods prior to Java 8
5427 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5428 check_illegal_static_method(ik, CHECK);
5429 }
5430
5431 // Obtain this_klass' module entry
5432 ModuleEntry* module_entry = ik->module();
5433 assert(module_entry != nullptr, "module_entry should always be set");
5434
5435 // Obtain java.lang.Module
5436 Handle module_handle(THREAD, module_entry->module());
5437
5438 // Allocate mirror and initialize static fields
5439 java_lang_Class::create_mirror(ik,
5440 Handle(THREAD, _loader_data->class_loader()),
5441 module_handle,
5442 _protection_domain,
5443 cl_inst_info.class_data(),
5444 CHECK);
5445
5446 assert(_all_mirandas != nullptr, "invariant");
5447
5448 // Generate any default methods - default methods are public interface methods
5449 // that have a default implementation. This is new with Java 8.
5450 if (_has_nonstatic_concrete_methods) {
5451 DefaultMethods::generate_default_methods(ik,
5452 _all_mirandas,
5453 CHECK);
5454 }
5455
5456 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5457 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5458 !module_entry->has_default_read_edges()) {
5459 if (!module_entry->set_has_default_read_edges()) {
5460 // We won a potential race
5461 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5462 }
5463 }
5464
5465 if (is_inline_type()) {
5466 InlineKlass* vk = InlineKlass::cast(ik);
5467 vk->set_payload_alignment(_layout_info->_payload_alignment);
5468 vk->set_payload_offset(_layout_info->_payload_offset);
5469 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5470 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5471 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5472 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5473 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5474 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5475 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5476 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5477 vk->initialize_calling_convention(CHECK);
5478 }
5479
5480 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5481
5482 if (!is_internal()) {
5483 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5484
5485 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5486 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5487 log_is_enabled(Info, class, preview)) {
5488 ResourceMark rm;
5489 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5490 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5491 }
5492
5493 if (log_is_enabled(Debug, class, resolve)) {
5494 ResourceMark rm;
5495 // print out the superclass.
5496 const char * from = ik->external_name();
5497 if (ik->java_super() != nullptr) {
5498 log_debug(class, resolve)("%s %s (super)",
5499 from,
5500 ik->java_super()->external_name());
5501 }
5502 // print out each of the interface classes referred to by this class.
5503 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5504 if (local_interfaces != nullptr) {
5505 const int length = local_interfaces->length();
5506 for (int i = 0; i < length; i++) {
5507 const InstanceKlass* const k = local_interfaces->at(i);
5508 const char * to = k->external_name();
5509 log_debug(class, resolve)("%s %s (interface)", from, to);
5510 }
5511 }
5512 }
5513 }
5514
5515 JFR_ONLY(INIT_ID(ik);)
5516
5517 // If we reach here, all is well.
5518 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5519 // in order for it to not be destroyed in the ClassFileParser destructor.
5520 set_klass_to_deallocate(nullptr);
5521
5522 // it's official
5523 set_klass(ik);
5524
5525 debug_only(ik->verify();)
5526 }
5527
5528 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5529 // Decrement the refcount in the old name, since we're clobbering it.
5530 _class_name->decrement_refcount();
5531
5532 _class_name = new_class_name;
5533 // Increment the refcount of the new name.
5534 // Now the ClassFileParser owns this name and will decrement in
5535 // the destructor.
5536 _class_name->increment_refcount();
5537 }
5538
5539 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5540 Symbol* name,
5541 ClassLoaderData* loader_data,
5542 const ClassLoadInfo* cl_info,
5543 Publicity pub_level,
5544 TRAPS) :
5545 _stream(stream),
5546 _class_name(nullptr),
5547 _loader_data(loader_data),
5548 _is_hidden(cl_info->is_hidden()),
5549 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5550 _orig_cp_size(0),
5551 _static_oop_count(0),
5552 _super_klass(),
5553 _cp(nullptr),
5554 _fieldinfo_stream(nullptr),
5555 _fields_status(nullptr),
5556 _methods(nullptr),
5557 _inner_classes(nullptr),
5558 _nest_members(nullptr),
5559 _nest_host(0),
5560 _permitted_subclasses(nullptr),
5561 _loadable_descriptors(nullptr),
5562 _record_components(nullptr),
5563 _local_interfaces(nullptr),
5564 _local_interface_indexes(nullptr),
5565 _transitive_interfaces(nullptr),
5566 _combined_annotations(nullptr),
5567 _class_annotations(nullptr),
5568 _class_type_annotations(nullptr),
5569 _fields_annotations(nullptr),
5570 _fields_type_annotations(nullptr),
5571 _klass(nullptr),
5572 _klass_to_deallocate(nullptr),
5573 _parsed_annotations(nullptr),
5574 _layout_info(nullptr),
5575 _inline_layout_info_array(nullptr),
5576 _temp_field_info(nullptr),
5577 _method_ordering(nullptr),
5578 _all_mirandas(nullptr),
5579 _vtable_size(0),
5580 _itable_size(0),
5581 _num_miranda_methods(0),
5582 _protection_domain(cl_info->protection_domain()),
5583 _access_flags(),
5584 _pub_level(pub_level),
5585 _bad_constant_seen(0),
5586 _synthetic_flag(false),
5587 _sde_length(false),
5588 _sde_buffer(nullptr),
5589 _sourcefile_index(0),
5590 _generic_signature_index(0),
5591 _major_version(0),
5592 _minor_version(0),
5593 _this_class_index(0),
5594 _super_class_index(0),
5595 _itfs_len(0),
5596 _java_fields_count(0),
5597 _need_verify(false),
5598 _has_nonstatic_concrete_methods(false),
5599 _declares_nonstatic_concrete_methods(false),
5600 _has_localvariable_table(false),
5601 _has_final_method(false),
5602 _has_contended_fields(false),
5603 _has_inline_type_fields(false),
5604 _is_naturally_atomic(false),
5605 _must_be_atomic(true),
5606 _has_loosely_consistent_annotation(false),
5607 _has_finalizer(false),
5608 _has_empty_finalizer(false),
5609 _max_bootstrap_specifier_index(-1) {
5610
5611 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5612 _class_name->increment_refcount();
5613
5614 assert(_loader_data != nullptr, "invariant");
5615 assert(stream != nullptr, "invariant");
5616 assert(_stream != nullptr, "invariant");
5617 assert(_stream->buffer() == _stream->current(), "invariant");
5618 assert(_class_name != nullptr, "invariant");
5619 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5620
5621 // Figure out whether we can skip format checking (matching classic VM behavior)
5622 _need_verify = Verifier::should_verify_for(_loader_data->class_loader());
5623
5624 // synch back verification state to stream to check for truncation.
5625 stream->set_need_verify(_need_verify);
5626
5627 parse_stream(stream, CHECK);
5628
5629 post_process_parsed_stream(stream, _cp, CHECK);
5630 }
5631
5632 void ClassFileParser::clear_class_metadata() {
5633 // metadata created before the instance klass is created. Must be
5634 // deallocated if classfile parsing returns an error.
5635 _cp = nullptr;
5636 _fieldinfo_stream = nullptr;
5637 _fields_status = nullptr;
5638 _methods = nullptr;
5639 _inner_classes = nullptr;
5640 _nest_members = nullptr;
5641 _permitted_subclasses = nullptr;
5642 _loadable_descriptors = nullptr;
5643 _combined_annotations = nullptr;
5644 _class_annotations = _class_type_annotations = nullptr;
5645 _fields_annotations = _fields_type_annotations = nullptr;
5646 _record_components = nullptr;
5647 _inline_layout_info_array = nullptr;
5648 }
5649
5650 // Destructor to clean up
5651 ClassFileParser::~ClassFileParser() {
5652 _class_name->decrement_refcount();
5653
5654 if (_cp != nullptr) {
5655 MetadataFactory::free_metadata(_loader_data, _cp);
5656 }
5657
5658 if (_fieldinfo_stream != nullptr) {
5659 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5660 }
5661
5662 if (_fields_status != nullptr) {
5663 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5664 }
5665
5666 if (_inline_layout_info_array != nullptr) {
5667 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5668 }
5669
5670 if (_methods != nullptr) {
5671 // Free methods
5672 InstanceKlass::deallocate_methods(_loader_data, _methods);
5673 }
5674
5675 // beware of the Universe::empty_blah_array!!
5676 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5677 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5678 }
5679
5680 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5681 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5682 }
5683
5684 if (_record_components != nullptr) {
5685 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5686 }
5687
5688 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5689 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5690 }
5691
5692 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5693 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5694 }
5695
5696 // Free interfaces
5697 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5698 _local_interfaces, _transitive_interfaces);
5699
5700 if (_combined_annotations != nullptr) {
5701 // After all annotations arrays have been created, they are installed into the
5702 // Annotations object that will be assigned to the InstanceKlass being created.
5703
5704 // Deallocate the Annotations object and the installed annotations arrays.
5705 _combined_annotations->deallocate_contents(_loader_data);
5706
5707 // If the _combined_annotations pointer is non-null,
5708 // then the other annotations fields should have been cleared.
5709 assert(_class_annotations == nullptr, "Should have been cleared");
5710 assert(_class_type_annotations == nullptr, "Should have been cleared");
5711 assert(_fields_annotations == nullptr, "Should have been cleared");
5712 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5713 } else {
5714 // If the annotations arrays were not installed into the Annotations object,
5715 // then they have to be deallocated explicitly.
5716 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5717 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5718 Annotations::free_contents(_loader_data, _fields_annotations);
5719 Annotations::free_contents(_loader_data, _fields_type_annotations);
5720 }
5721
5722 clear_class_metadata();
5723 _transitive_interfaces = nullptr;
5724 _local_interfaces = nullptr;
5725
5726 // deallocate the klass if already created. Don't directly deallocate, but add
5727 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5728 // at a safepoint.
5729 if (_klass_to_deallocate != nullptr) {
5730 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5731 }
5732 }
5733
5734 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5735 TRAPS) {
5736
5737 assert(stream != nullptr, "invariant");
5738 assert(_class_name != nullptr, "invariant");
5739
5740 // BEGIN STREAM PARSING
5741 stream->guarantee_more(8, CHECK); // magic, major, minor
5742 // Magic value
5743 const u4 magic = stream->get_u4_fast();
5744 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5745 "Incompatible magic value %u in class file %s",
5746 magic, CHECK);
5747
5748 // Version numbers
5749 _minor_version = stream->get_u2_fast();
5750 _major_version = stream->get_u2_fast();
5751
5752 // Check version numbers - we check this even with verifier off
5753 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5754
5755 stream->guarantee_more(3, CHECK); // length, first cp tag
5756 u2 cp_size = stream->get_u2_fast();
5757
5758 guarantee_property(
5759 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5760 cp_size, CHECK);
5761
5762 _orig_cp_size = cp_size;
5763 if (is_hidden()) { // Add a slot for hidden class name.
5764 cp_size++;
5765 }
5766
5767 _cp = ConstantPool::allocate(_loader_data,
5768 cp_size,
5769 CHECK);
5770
5771 ConstantPool* const cp = _cp;
5772
5773 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5774
5775 assert(cp_size == (u2)cp->length(), "invariant");
5776
5777 // ACCESS FLAGS
5778 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5779
5780 u2 recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
5781 // JVM_ACC_MODULE is defined in JDK-9 and later.
5782 if (_major_version >= JAVA_9_VERSION) {
5783 recognized_modifiers |= JVM_ACC_MODULE;
5784 }
5785
5786 // Access flags
5787 u2 flags = stream->get_u2_fast() & recognized_modifiers;
5788
5789 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5790 // Set abstract bit for old class files for backward compatibility
5791 flags |= JVM_ACC_ABSTRACT;
5792 }
5793
5794 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5795 if (!supports_inline_types()) {
5796 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5797 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5798 if (!is_module && !is_interface) {
5799 flags |= JVM_ACC_IDENTITY;
5800 }
5801 }
5802
5803
5804 // This class and superclass
5805 _this_class_index = stream->get_u2_fast();
5806 guarantee_property(
5807 valid_cp_range(_this_class_index, cp_size) &&
5808 cp->tag_at(_this_class_index).is_unresolved_klass(),
5809 "Invalid this class index %u in constant pool in class file %s",
5810 _this_class_index, CHECK);
5811
5812 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5813 assert(class_name_in_cp != nullptr, "class_name can't be null");
5814
5815 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
5816
5817 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
5818
5819 _access_flags.set_flags(flags);
5820
5821 short bad_constant = class_bad_constant_seen();
5822 if (bad_constant != 0) {
5823 // Do not throw CFE until after the access_flags are checked because if
5824 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5825 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5826 return;
5827 }
5828
5829 // Don't need to check whether this class name is legal or not.
5830 // It has been checked when constant pool is parsed.
5831 // However, make sure it is not an array type.
5832 if (_need_verify) {
5833 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5834 "Bad class name in class file %s",
5835 CHECK);
5836 }
5837
5838 #ifdef ASSERT
5839 // Basic sanity checks
5840 if (_is_hidden) {
5841 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5842 }
5843 #endif
5844
5845 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5846
5847 if (_is_hidden) {
5848 assert(_class_name != nullptr, "Unexpected null _class_name");
5849 #ifdef ASSERT
5850 if (_need_verify) {
5851 verify_legal_class_name(_class_name, CHECK);
5852 }
5853 #endif
5854
5855 } else {
5856 // Check if name in class file matches given name
5857 if (_class_name != class_name_in_cp) {
5858 if (_class_name != vmSymbols::unknown_class_name()) {
5859 ResourceMark rm(THREAD);
5860 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5861 Exceptions::fthrow(THREAD_AND_LOCATION,
5862 vmSymbols::java_lang_NoClassDefFoundError(),
5863 "%s (wrong name: %s)",
5864 _class_name->as_C_string(),
5865 class_name_in_cp->as_C_string()
5866 );
5867 return;
5868 } else {
5869 // The class name was not known by the caller so we set it from
5870 // the value in the CP.
5871 update_class_name(class_name_in_cp);
5872 }
5873 // else nothing to do: the expected class name matches what is in the CP
5874 }
5875 }
5876
5877 // Verification prevents us from creating names with dots in them, this
5878 // asserts that that's the case.
5879 assert(is_internal_format(_class_name), "external class name format used internally");
5880
5881 if (!is_internal()) {
5882 LogTarget(Debug, class, preorder) lt;
5883 if (lt.is_enabled()){
5884 ResourceMark rm(THREAD);
5885 LogStream ls(lt);
5886 ls.print("%s", _class_name->as_klass_external_name());
5887 if (stream->source() != nullptr) {
5888 ls.print(" source: %s", stream->source());
5889 }
5890 ls.cr();
5891 }
5892 }
5893
5894 // SUPERKLASS
5895 _super_class_index = stream->get_u2_fast();
5896 _super_klass = parse_super_class(cp,
5897 _super_class_index,
5898 _need_verify,
5899 CHECK);
5900
5901 // Interfaces
5902 _itfs_len = stream->get_u2_fast();
5903 parse_interfaces(stream,
5904 _itfs_len,
5905 cp,
5906 &_has_nonstatic_concrete_methods,
5907 CHECK);
5908
5909 // Fields (offsets are filled in later)
5910 parse_fields(stream,
5911 _access_flags,
5912 cp,
5913 cp_size,
5914 &_java_fields_count,
5915 CHECK);
5916
5917 assert(_temp_field_info != nullptr, "invariant");
5918
5919 // Methods
5920 parse_methods(stream,
5921 is_interface(),
5922 !is_identity_class(),
5923 is_abstract_class(),
5924 &_has_localvariable_table,
5925 &_has_final_method,
5926 &_declares_nonstatic_concrete_methods,
5927 CHECK);
5928
5929 assert(_methods != nullptr, "invariant");
5930
5931 if (_declares_nonstatic_concrete_methods) {
5932 _has_nonstatic_concrete_methods = true;
5933 }
5934
5935 // Additional attributes/annotations
5936 _parsed_annotations = new ClassAnnotationCollector();
5937 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5938
5939 assert(_inner_classes != nullptr, "invariant");
5940
5941 // Finalize the Annotations metadata object,
5942 // now that all annotation arrays have been created.
5943 create_combined_annotations(CHECK);
5944
5945 // Make sure this is the end of class file stream
5946 guarantee_property(stream->at_eos(),
5947 "Extra bytes at the end of class file %s",
5948 CHECK);
5949
5950 // all bytes in stream read and parsed
5951 }
5952
5953 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5954 ResourceMark rm;
5955 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5956 // use a '/' because that confuses finding the class's package. Also, can't
5957 // use an illegal char such as ';' because that causes serialization issues
5958 // and issues with hidden classes that create their own hidden classes.
5959 char addr_buf[20];
5960 if (CDSConfig::is_dumping_static_archive()) {
5961 // We want stable names for the archived hidden classes (only for static
5962 // archive for now). Spaces under default_SharedBaseAddress() will be
5963 // occupied by the archive at run time, so we know that no dynamically
5964 // loaded InstanceKlass will be placed under there.
5965 static volatile size_t counter = 0;
5966 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5967 size_t new_id = Atomic::add(&counter, (size_t)1);
5968 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
5969 } else {
5970 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5971 }
5972 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5973 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5974 jio_snprintf(new_name, new_name_len, "%s+%s",
5975 _class_name->as_C_string(), addr_buf);
5976 update_class_name(SymbolTable::new_symbol(new_name));
5977
5978 // Add a Utf8 entry containing the hidden name.
5979 assert(_class_name != nullptr, "Unexpected null _class_name");
5980 int hidden_index = _orig_cp_size; // this is an extra slot we added
5981 _cp->symbol_at_put(hidden_index, _class_name);
5982
5983 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5984 // We have to update the resolved_klass_index and the name_index together
5985 // so extract the existing resolved_klass_index first.
5986 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5987 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5988 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5989 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5990 "Bad name_index");
5991 }
5992
5993 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5994 ConstantPool* cp,
5995 TRAPS) {
5996 assert(stream != nullptr, "invariant");
5997 assert(stream->at_eos(), "invariant");
5998 assert(cp != nullptr, "invariant");
5999 assert(_loader_data != nullptr, "invariant");
6000
6001 if (_class_name == vmSymbols::java_lang_Object()) {
6002 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6003 "java.lang.Object cannot implement an interface in class file %s",
6004 CHECK);
6005 }
6006 // We check super class after class file is parsed and format is checked
6007 if (_super_class_index > 0 && nullptr == _super_klass) {
6008 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6009 if (is_interface()) {
6010 // Before attempting to resolve the superclass, check for class format
6011 // errors not checked yet.
6012 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6013 "Interfaces must have java.lang.Object as superclass in class file %s",
6014 CHECK);
6015 }
6016 Handle loader(THREAD, _loader_data->class_loader());
6017 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6018 _super_klass = vmClasses::Object_klass();
6019 } else {
6020 _super_klass = (const InstanceKlass*)
6021 SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6022 super_class_name,
6023 loader,
6024 true,
6025 CHECK);
6026 }
6027 }
6028
6029 if (_super_klass != nullptr) {
6030 if (_super_klass->is_interface()) {
6031 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6032 return;
6033 }
6034
6035 if (_super_klass->is_final()) {
6036 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6037 return;
6038 }
6039
6040 if (EnableValhalla) {
6041 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6042 }
6043
6044 if (_super_klass->has_nonstatic_concrete_methods()) {
6045 _has_nonstatic_concrete_methods = true;
6046 }
6047 }
6048
6049 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6050 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6051 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6052 _class_name->as_klass_external_name()));
6053 }
6054
6055 // Determining is the class allows tearing or not (default is not)
6056 if (EnableValhalla && !_access_flags.is_identity_class()) {
6057 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6058 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6059 // Conditions above are not sufficient to determine atomicity requirements,
6060 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6061 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6062 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6063 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6064 _must_be_atomic = false;
6065 }
6066 // Apply VM options override
6067 if (*ForceNonTearable != '\0') {
6068 // Allow a command line switch to force the same atomicity property:
6069 const char* class_name_str = _class_name->as_C_string();
6070 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6071 _must_be_atomic = true;
6072 }
6073 }
6074 }
6075
6076 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6077 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6078 if (_local_interface_indexes != nullptr) {
6079 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6080 u2 interface_index = _local_interface_indexes->at(i);
6081 Klass* interf;
6082 if (cp->tag_at(interface_index).is_klass()) {
6083 interf = cp->resolved_klass_at(interface_index);
6084 } else {
6085 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6086
6087 // Don't need to check legal name because it's checked when parsing constant pool.
6088 // But need to make sure it's not an array type.
6089 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6090 "Bad interface name in class file %s", CHECK);
6091
6092 // Call resolve on the interface class name with class circularity checking
6093 interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6094 _class_name,
6095 unresolved_klass,
6096 Handle(THREAD, _loader_data->class_loader()),
6097 false,
6098 CHECK);
6099 }
6100
6101 if (!interf->is_interface()) {
6102 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6103 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6104 _class_name->as_klass_external_name(),
6105 interf->external_name(),
6106 interf->class_in_module_of_loader()));
6107 }
6108
6109 if (EnableValhalla) {
6110 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6111 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6112 }
6113
6114 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6115 _has_nonstatic_concrete_methods = true;
6116 }
6117 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6118 }
6119 }
6120 assert(_local_interfaces != nullptr, "invariant");
6121
6122 // Compute the transitive list of all unique interfaces implemented by this class
6123 _transitive_interfaces =
6124 compute_transitive_interfaces(_super_klass,
6125 _local_interfaces,
6126 _loader_data,
6127 CHECK);
6128
6129 assert(_transitive_interfaces != nullptr, "invariant");
6130
6131 // sort methods
6132 _method_ordering = sort_methods(_methods);
6133
6134 _all_mirandas = new GrowableArray<Method*>(20);
6135
6136 Handle loader(THREAD, _loader_data->class_loader());
6137 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6138 &_num_miranda_methods,
6139 _all_mirandas,
6140 _super_klass,
6141 _methods,
6142 _access_flags,
6143 _major_version,
6144 loader,
6145 _class_name,
6146 _local_interfaces);
6147
6148 // Size of Java itable (in words)
6149 _itable_size = is_interface() ? 0 :
6150 klassItable::compute_itable_size(_transitive_interfaces);
6151
6152 assert(_parsed_annotations != nullptr, "invariant");
6153
6154 if (EnableValhalla) {
6155 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6156 java_fields_count(),
6157 CHECK);
6158 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6159 FieldInfo fieldinfo = *it;
6160 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6161 Symbol* sig = fieldinfo.signature(cp);
6162 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6163 // Pre-load classes of null-free fields that are candidate for flattening
6164 TempNewSymbol s = Signature::strip_envelope(sig);
6165 if (s == _class_name) {
6166 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(), err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6167 }
6168 log_info(class, preload)("Preloading class %s during loading of class %s. Cause: a null-free non-static field is declared with this type", s->as_C_string(), _class_name->as_C_string());
6169 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s, Handle(THREAD, _loader_data->class_loader()), false, THREAD);
6170 if (HAS_PENDING_EXCEPTION) {
6171 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) failed: %s",
6172 s->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6173 return; // Exception is still pending
6174 }
6175 assert(klass != nullptr, "Sanity check");
6176 if (klass->access_flags().is_identity_class()) {
6177 assert(klass->is_instance_klass(), "Sanity check");
6178 ResourceMark rm(THREAD);
6179 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6180 err_msg("Class %s expects class %s to be a value class, but it is an identity class",
6181 _class_name->as_C_string(),
6182 InstanceKlass::cast(klass)->external_name()));
6183 }
6184 if (klass->is_abstract()) {
6185 assert(klass->is_instance_klass(), "Sanity check");
6186 ResourceMark rm(THREAD);
6187 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6188 err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
6189 _class_name->as_C_string(),
6190 InstanceKlass::cast(klass)->external_name()));
6191 }
6192 InlineKlass* vk = InlineKlass::cast(klass);
6193 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6194 log_info(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) succeeded", s->as_C_string(), _class_name->as_C_string());
6195 } else if (Signature::has_envelope(sig)) {
6196 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6197 // Those classes would be required later for the flattening of nullable inline type fields
6198 TempNewSymbol name = Signature::strip_envelope(sig);
6199 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6200 log_info(class, preload)("Preloading class %s during loading of class %s. Cause: field type in LoadableDescriptors attribute", name->as_C_string(), _class_name->as_C_string());
6201 oop loader = loader_data()->class_loader();
6202 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name, Handle(THREAD, loader), false, THREAD);
6203 if (klass != nullptr) {
6204 if (klass->is_inline_klass()) {
6205 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6206 log_info(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) succeeded", name->as_C_string(), _class_name->as_C_string());
6207 } else {
6208 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6209 log_warning(class, preload)("Preloading class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) but loaded class is not a value class", name->as_C_string(), _class_name->as_C_string());
6210 }
6211 } else {
6212 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) failed : %s",
6213 name->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6214 }
6215 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6216 if (HAS_PENDING_EXCEPTION) {
6217 CLEAR_PENDING_EXCEPTION;
6218 }
6219 }
6220 }
6221 }
6222 }
6223
6224 _layout_info = new FieldLayoutInfo();
6225 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6226 _parsed_annotations->is_contended(), is_inline_type(),
6227 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6228 _must_be_atomic, _layout_info, _inline_layout_info_array);
6229 lb.build_layout();
6230 _has_inline_type_fields = _layout_info->_has_inline_fields;
6231
6232 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6233 _fieldinfo_stream =
6234 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6235 injected_fields_count, loader_data(), CHECK);
6236
6237 _fields_status =
6238 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6239 FieldStatus(0), CHECK);
6240 }
6241
6242 void ClassFileParser::set_klass(InstanceKlass* klass) {
6243
6244 #ifdef ASSERT
6245 if (klass != nullptr) {
6246 assert(nullptr == _klass, "leaking?");
6247 }
6248 #endif
6249
6250 _klass = klass;
6251 }
6252
6253 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6254
6255 #ifdef ASSERT
6256 if (klass != nullptr) {
6257 assert(nullptr == _klass_to_deallocate, "leaking?");
6258 }
6259 #endif
6260
6261 _klass_to_deallocate = klass;
6262 }
6263
6264 // Caller responsible for ResourceMark
6265 // clone stream with rewound position
6266 const ClassFileStream* ClassFileParser::clone_stream() const {
6267 assert(_stream != nullptr, "invariant");
6268
6269 return _stream->clone();
6270 }
6271
6272 ReferenceType ClassFileParser::super_reference_type() const {
6273 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6274 }
6275
6276 bool ClassFileParser::is_instance_ref_klass() const {
6277 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6278 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6279 // klass requiring special treatment in ref-processing. The abstract
6280 // j.l.r.Reference cannot be instantiated so doesn't partake in
6281 // ref-processing.
6282 return is_java_lang_ref_Reference_subclass();
6283 }
6284
6285 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6286 if (_super_klass == nullptr) {
6287 return false;
6288 }
6289
6290 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6291 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6292 return true;
6293 }
6294
6295 return _super_klass->reference_type() != REF_NONE;
6296 }
6297
6298 // Returns true if the future Klass will need to be addressable with a narrow Klass ID.
6299 bool ClassFileParser::klass_needs_narrow_id() const {
6300 // Classes that are never instantiated need no narrow Klass Id, since the
6301 // only point of having a narrow id is to put it into an object header. Keeping
6302 // never instantiated classes out of class space lessens the class space pressure.
6303 // For more details, see JDK-8338526.
6304 return !is_interface() && !is_abstract();
6305 }
6306
6307 // ----------------------------------------------------------------------------
6308 // debugging
6309
6310 #ifdef ASSERT
6311
6312 // return true if class_name contains no '.' (internal format is '/')
6313 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6314 if (class_name != nullptr) {
6315 ResourceMark rm;
6316 char* name = class_name->as_C_string();
6317 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6318 } else {
6319 return true;
6320 }
6321 }
6322
6323 #endif