1 /*
2 * Copyright (c) 1997, 2023, 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 "precompiled.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/classLoadInfo.hpp"
33 #include "classfile/defaultMethods.hpp"
34 #include "classfile/fieldLayoutBuilder.hpp"
35 #include "classfile/javaClasses.inline.hpp"
36 #include "classfile/moduleEntry.hpp"
37 #include "classfile/packageEntry.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionary.hpp"
40 #include "classfile/verificationType.hpp"
41 #include "classfile/verifier.hpp"
42 #include "classfile/vmClasses.hpp"
43 #include "classfile/vmSymbols.hpp"
44 #include "jvm.h"
45 #include "logging/log.hpp"
46 #include "logging/logStream.hpp"
47 #include "memory/allocation.hpp"
48 #include "memory/metadataFactory.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/annotations.hpp"
53 #include "oops/constantPool.inline.hpp"
54 #include "oops/fieldInfo.hpp"
55 #include "oops/fieldStreams.inline.hpp"
56 #include "oops/inlineKlass.inline.hpp"
57 #include "oops/instanceKlass.inline.hpp"
58 #include "oops/instanceMirrorKlass.hpp"
59 #include "oops/klass.inline.hpp"
60 #include "oops/klassVtable.hpp"
61 #include "oops/metadata.hpp"
62 #include "oops/method.inline.hpp"
63 #include "oops/oop.inline.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/symbol.hpp"
66 #include "prims/jvmtiExport.hpp"
67 #include "prims/jvmtiThreadState.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/fieldDescriptor.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/os.hpp"
73 #include "runtime/perfData.hpp"
74 #include "runtime/reflection.hpp"
75 #include "runtime/safepointVerifiers.hpp"
76 #include "runtime/signature.hpp"
77 #include "runtime/timer.hpp"
78 #include "services/classLoadingService.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/bitMap.inline.hpp"
82 #include "utilities/checkedCast.hpp"
83 #include "utilities/copy.hpp"
84 #include "utilities/formatBuffer.hpp"
85 #include "utilities/exceptions.hpp"
86 #include "utilities/globalDefinitions.hpp"
87 #include "utilities/growableArray.hpp"
88 #include "utilities/macros.hpp"
89 #include "utilities/ostream.hpp"
90 #include "utilities/resourceHash.hpp"
91 #include "utilities/stringUtils.hpp"
92 #include "utilities/utf8.hpp"
93 #if INCLUDE_CDS
94 #include "classfile/systemDictionaryShared.hpp"
95 #endif
96 #if INCLUDE_JFR
97 #include "jfr/support/jfrTraceIdExtension.hpp"
98 #endif
99
100 // We generally try to create the oops directly when parsing, rather than
101 // allocating temporary data structures and copying the bytes twice. A
102 // temporary area is only needed when parsing utf8 entries in the constant
103 // pool and when parsing line number tables.
104
105 // We add assert in debug mode when class format is not checked.
106
107 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
108 #define JAVA_MIN_SUPPORTED_VERSION 45
109 #define JAVA_PREVIEW_MINOR_VERSION 65535
110
111 // Used for two backward compatibility reasons:
112 // - to check for new additions to the class file format in JDK1.5
113 // - to check for bug fixes in the format checker in JDK1.5
114 #define JAVA_1_5_VERSION 49
115
116 // Used for backward compatibility reasons:
117 // - to check for javac bug fixes that happened after 1.5
118 // - also used as the max version when running in jdk6
119 #define JAVA_6_VERSION 50
120
121 // Used for backward compatibility reasons:
122 // - to disallow argument and require ACC_STATIC for <clinit> methods
123 #define JAVA_7_VERSION 51
124
125 // Extension method support.
126 #define JAVA_8_VERSION 52
127
128 #define JAVA_9_VERSION 53
129
130 #define JAVA_10_VERSION 54
131
132 #define JAVA_11_VERSION 55
133
134 #define JAVA_12_VERSION 56
135
136 #define JAVA_13_VERSION 57
137
138 #define JAVA_14_VERSION 58
139
140 #define JAVA_15_VERSION 59
141
142 #define JAVA_16_VERSION 60
143
144 #define JAVA_17_VERSION 61
145
146 #define JAVA_18_VERSION 62
147
148 #define JAVA_19_VERSION 63
149
150 #define JAVA_20_VERSION 64
151
152 #define JAVA_21_VERSION 65
153
154 #define JAVA_22_VERSION 66
155
156 #define CONSTANT_CLASS_DESCRIPTORS 66
157
158 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
159 assert((bad_constant == JVM_CONSTANT_Module ||
160 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
161 "Unexpected bad constant pool entry");
162 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
163 }
164
165 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
166 ConstantPool* cp,
167 const int length,
168 TRAPS) {
169 assert(stream != nullptr, "invariant");
170 assert(cp != nullptr, "invariant");
171
172 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
173 // this function (_current can be allocated in a register, with scalar
174 // replacement of aggregates). The _current pointer is copied back to
175 // stream() when this function returns. DON'T call another method within
176 // this method that uses stream().
177 const ClassFileStream cfs1 = *stream;
178 const ClassFileStream* const cfs = &cfs1;
179
180 debug_only(const u1* const old_current = stream->current();)
181
182 // Used for batching symbol allocations.
183 const char* names[SymbolTable::symbol_alloc_batch_size];
184 int lengths[SymbolTable::symbol_alloc_batch_size];
185 int indices[SymbolTable::symbol_alloc_batch_size];
186 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
187 int names_count = 0;
188
189 // parsing Index 0 is unused
190 for (int index = 1; index < length; index++) {
191 // Each of the following case guarantees one more byte in the stream
192 // for the following tag or the access_flags following constant pool,
193 // so we don't need bounds-check for reading tag.
194 const u1 tag = cfs->get_u1_fast();
195 switch (tag) {
196 case JVM_CONSTANT_Class: {
197 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
198 const u2 name_index = cfs->get_u2_fast();
199 cp->klass_index_at_put(index, name_index);
200 break;
201 }
202 case JVM_CONSTANT_Fieldref: {
203 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
204 const u2 class_index = cfs->get_u2_fast();
205 const u2 name_and_type_index = cfs->get_u2_fast();
206 cp->field_at_put(index, class_index, name_and_type_index);
207 break;
208 }
209 case JVM_CONSTANT_Methodref: {
210 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
211 const u2 class_index = cfs->get_u2_fast();
212 const u2 name_and_type_index = cfs->get_u2_fast();
213 cp->method_at_put(index, class_index, name_and_type_index);
214 break;
215 }
216 case JVM_CONSTANT_InterfaceMethodref: {
217 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
218 const u2 class_index = cfs->get_u2_fast();
219 const u2 name_and_type_index = cfs->get_u2_fast();
220 cp->interface_method_at_put(index, class_index, name_and_type_index);
221 break;
222 }
223 case JVM_CONSTANT_String : {
224 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
225 const u2 string_index = cfs->get_u2_fast();
226 cp->string_index_at_put(index, string_index);
227 break;
228 }
229 case JVM_CONSTANT_MethodHandle :
230 case JVM_CONSTANT_MethodType: {
231 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
232 classfile_parse_error(
233 "Class file version does not support constant tag %u in class file %s",
234 tag, THREAD);
235 return;
236 }
237 if (tag == JVM_CONSTANT_MethodHandle) {
238 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
239 const u1 ref_kind = cfs->get_u1_fast();
240 const u2 method_index = cfs->get_u2_fast();
241 cp->method_handle_index_at_put(index, ref_kind, method_index);
242 }
243 else if (tag == JVM_CONSTANT_MethodType) {
244 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
245 const u2 signature_index = cfs->get_u2_fast();
246 cp->method_type_index_at_put(index, signature_index);
247 }
248 else {
249 ShouldNotReachHere();
250 }
251 break;
252 }
253 case JVM_CONSTANT_Dynamic : {
254 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
255 classfile_parse_error(
256 "Class file version does not support constant tag %u in class file %s",
257 tag, THREAD);
258 return;
259 }
260 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
261 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
262 const u2 name_and_type_index = cfs->get_u2_fast();
263 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
264 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
265 }
266 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
267 break;
268 }
269 case JVM_CONSTANT_InvokeDynamic : {
270 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
271 classfile_parse_error(
272 "Class file version does not support constant tag %u in class file %s",
273 tag, THREAD);
274 return;
275 }
276 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
277 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
278 const u2 name_and_type_index = cfs->get_u2_fast();
279 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
280 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
281 }
282 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
283 break;
284 }
285 case JVM_CONSTANT_Integer: {
286 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
287 const u4 bytes = cfs->get_u4_fast();
288 cp->int_at_put(index, (jint)bytes);
289 break;
290 }
291 case JVM_CONSTANT_Float: {
292 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
293 const u4 bytes = cfs->get_u4_fast();
294 cp->float_at_put(index, *(jfloat*)&bytes);
295 break;
296 }
297 case JVM_CONSTANT_Long: {
298 // A mangled type might cause you to overrun allocated memory
299 guarantee_property(index + 1 < length,
300 "Invalid constant pool entry %u in class file %s",
301 index,
302 CHECK);
303 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
304 const u8 bytes = cfs->get_u8_fast();
305 cp->long_at_put(index, bytes);
306 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
307 break;
308 }
309 case JVM_CONSTANT_Double: {
310 // A mangled type might cause you to overrun allocated memory
311 guarantee_property(index+1 < length,
312 "Invalid constant pool entry %u in class file %s",
313 index,
314 CHECK);
315 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
316 const u8 bytes = cfs->get_u8_fast();
317 cp->double_at_put(index, *(jdouble*)&bytes);
318 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
319 break;
320 }
321 case JVM_CONSTANT_NameAndType: {
322 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
323 const u2 name_index = cfs->get_u2_fast();
324 const u2 signature_index = cfs->get_u2_fast();
325 cp->name_and_type_at_put(index, name_index, signature_index);
326 break;
327 }
328 case JVM_CONSTANT_Utf8 : {
329 cfs->guarantee_more(2, CHECK); // utf8_length
330 u2 utf8_length = cfs->get_u2_fast();
331 const u1* utf8_buffer = cfs->current();
332 assert(utf8_buffer != nullptr, "null utf8 buffer");
333 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
334 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
335 cfs->skip_u1_fast(utf8_length);
336
337 // Before storing the symbol, make sure it's legal
338 if (_need_verify) {
339 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
340 }
341
342 unsigned int hash;
343 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
344 utf8_length,
345 hash);
346 if (result == nullptr) {
347 names[names_count] = (const char*)utf8_buffer;
348 lengths[names_count] = utf8_length;
349 indices[names_count] = index;
350 hashValues[names_count++] = hash;
351 if (names_count == SymbolTable::symbol_alloc_batch_size) {
352 SymbolTable::new_symbols(_loader_data,
353 constantPoolHandle(THREAD, cp),
354 names_count,
355 names,
356 lengths,
357 indices,
358 hashValues);
359 names_count = 0;
360 }
361 } else {
362 cp->symbol_at_put(index, result);
363 }
364 break;
365 }
366 case JVM_CONSTANT_Module:
367 case JVM_CONSTANT_Package: {
368 // Record that an error occurred in these two cases but keep parsing so
369 // that ACC_Module can be checked for in the access_flags. Need to
370 // throw NoClassDefFoundError in that case.
371 if (_major_version >= JAVA_9_VERSION) {
372 cfs->guarantee_more(3, CHECK);
373 cfs->get_u2_fast();
374 set_class_bad_constant_seen(tag);
375 break;
376 }
377 }
378 default: {
379 classfile_parse_error("Unknown constant tag %u in class file %s",
380 tag,
381 THREAD);
382 return;
383 }
384 } // end of switch(tag)
385 } // end of for
386
387 // Allocate the remaining symbols
388 if (names_count > 0) {
389 SymbolTable::new_symbols(_loader_data,
390 constantPoolHandle(THREAD, cp),
391 names_count,
392 names,
393 lengths,
394 indices,
395 hashValues);
396 }
397
398 // Copy _current pointer of local copy back to stream.
399 assert(stream->current() == old_current, "non-exclusive use of stream");
400 stream->set_current(cfs1.current());
401
402 }
403
404 static inline bool valid_cp_range(int index, int length) {
405 return (index > 0 && index < length);
406 }
407
408 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
409 assert(cp != nullptr, "invariant");
410 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
411 return cp->symbol_at(index);
412 }
413 return nullptr;
414 }
415
416 #ifdef ASSERT
417 PRAGMA_DIAG_PUSH
418 PRAGMA_FORMAT_NONLITERAL_IGNORED
419 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
420 ResourceMark rm(THREAD);
421 fatal(msg, _class_name->as_C_string());
422 }
423
424 void ClassFileParser::report_assert_property_failure(const char* msg,
425 int index,
426 TRAPS) const {
427 ResourceMark rm(THREAD);
428 fatal(msg, index, _class_name->as_C_string());
429 }
430 PRAGMA_DIAG_POP
431 #endif
432
433 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
434 ConstantPool* const cp,
435 const int length,
436 TRAPS) {
437 assert(cp != nullptr, "invariant");
438 assert(stream != nullptr, "invariant");
439
440 // parsing constant pool entries
441 parse_constant_pool_entries(stream, cp, length, CHECK);
442 if (class_bad_constant_seen() != 0) {
443 // a bad CP entry has been detected previously so stop parsing and just return.
444 return;
445 }
446
447 int index = 1; // declared outside of loops for portability
448 int num_klasses = 0;
449
450 // first verification pass - validate cross references
451 // and fixup class and string constants
452 for (index = 1; index < length; index++) { // Index 0 is unused
453 const jbyte tag = cp->tag_at(index).value();
454 switch (tag) {
455 case JVM_CONSTANT_Class: {
456 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
457 break;
458 }
459 case JVM_CONSTANT_Fieldref:
460 // fall through
461 case JVM_CONSTANT_Methodref:
462 // fall through
463 case JVM_CONSTANT_InterfaceMethodref: {
464 if (!_need_verify) break;
465 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
466 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
467 check_property(valid_klass_reference_at(klass_ref_index),
468 "Invalid constant pool index %u in class file %s",
469 klass_ref_index, CHECK);
470 check_property(valid_cp_range(name_and_type_ref_index, length) &&
471 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
472 "Invalid constant pool index %u in class file %s",
473 name_and_type_ref_index, CHECK);
474 break;
475 }
476 case JVM_CONSTANT_String: {
477 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
478 break;
479 }
480 case JVM_CONSTANT_Integer:
481 break;
482 case JVM_CONSTANT_Float:
483 break;
484 case JVM_CONSTANT_Long:
485 case JVM_CONSTANT_Double: {
486 index++;
487 check_property(
488 (index < length && cp->tag_at(index).is_invalid()),
489 "Improper constant pool long/double index %u in class file %s",
490 index, CHECK);
491 break;
492 }
493 case JVM_CONSTANT_NameAndType: {
494 if (!_need_verify) break;
495 const int name_ref_index = cp->name_ref_index_at(index);
496 const int signature_ref_index = cp->signature_ref_index_at(index);
497 check_property(valid_symbol_at(name_ref_index),
498 "Invalid constant pool index %u in class file %s",
499 name_ref_index, CHECK);
500 check_property(valid_symbol_at(signature_ref_index),
501 "Invalid constant pool index %u in class file %s",
502 signature_ref_index, CHECK);
503 break;
504 }
505 case JVM_CONSTANT_Utf8:
506 break;
507 case JVM_CONSTANT_UnresolvedClass: // fall-through
508 case JVM_CONSTANT_UnresolvedClassInError: {
509 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
510 break;
511 }
512 case JVM_CONSTANT_ClassIndex: {
513 const int class_index = cp->klass_index_at(index);
514 check_property(valid_symbol_at(class_index),
515 "Invalid constant pool index %u in class file %s",
516 class_index, CHECK);
517
518 Symbol* const name = cp->symbol_at(class_index);
519 const unsigned int name_len = name->utf8_length();
520 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
521 break;
522 }
523 case JVM_CONSTANT_StringIndex: {
524 const int string_index = cp->string_index_at(index);
525 check_property(valid_symbol_at(string_index),
526 "Invalid constant pool index %u in class file %s",
527 string_index, CHECK);
528 Symbol* const sym = cp->symbol_at(string_index);
529 cp->unresolved_string_at_put(index, sym);
530 break;
531 }
532 case JVM_CONSTANT_MethodHandle: {
533 const int ref_index = cp->method_handle_index_at(index);
534 check_property(valid_cp_range(ref_index, length),
535 "Invalid constant pool index %u in class file %s",
536 ref_index, CHECK);
537 const constantTag tag = cp->tag_at(ref_index);
538 const int ref_kind = cp->method_handle_ref_kind_at(index);
539
540 switch (ref_kind) {
541 case JVM_REF_getField:
542 case JVM_REF_getStatic:
543 case JVM_REF_putField:
544 case JVM_REF_putStatic: {
545 check_property(
546 tag.is_field(),
547 "Invalid constant pool index %u in class file %s (not a field)",
548 ref_index, CHECK);
549 break;
550 }
551 case JVM_REF_invokeVirtual:
552 case JVM_REF_newInvokeSpecial: {
553 check_property(
554 tag.is_method(),
555 "Invalid constant pool index %u in class file %s (not a method)",
556 ref_index, CHECK);
557 break;
558 }
559 case JVM_REF_invokeStatic:
560 case JVM_REF_invokeSpecial: {
561 check_property(
562 tag.is_method() ||
563 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
564 "Invalid constant pool index %u in class file %s (not a method)",
565 ref_index, CHECK);
566 break;
567 }
568 case JVM_REF_invokeInterface: {
569 check_property(
570 tag.is_interface_method(),
571 "Invalid constant pool index %u in class file %s (not an interface method)",
572 ref_index, CHECK);
573 break;
574 }
575 default: {
576 classfile_parse_error(
577 "Bad method handle kind at constant pool index %u in class file %s",
578 index, THREAD);
579 return;
580 }
581 } // switch(refkind)
582 // Keep the ref_index unchanged. It will be indirected at link-time.
583 break;
584 } // case MethodHandle
585 case JVM_CONSTANT_MethodType: {
586 const int ref_index = cp->method_type_index_at(index);
587 check_property(valid_symbol_at(ref_index),
588 "Invalid constant pool index %u in class file %s",
589 ref_index, CHECK);
590 break;
591 }
592 case JVM_CONSTANT_Dynamic: {
593 const int name_and_type_ref_index =
594 cp->bootstrap_name_and_type_ref_index_at(index);
595
596 check_property(valid_cp_range(name_and_type_ref_index, length) &&
597 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
598 "Invalid constant pool index %u in class file %s",
599 name_and_type_ref_index, CHECK);
600 // bootstrap specifier index must be checked later,
601 // when BootstrapMethods attr is available
602
603 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
604 cp->set_has_dynamic_constant();
605 break;
606 }
607 case JVM_CONSTANT_InvokeDynamic: {
608 const int name_and_type_ref_index =
609 cp->bootstrap_name_and_type_ref_index_at(index);
610
611 check_property(valid_cp_range(name_and_type_ref_index, length) &&
612 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
613 "Invalid constant pool index %u in class file %s",
614 name_and_type_ref_index, CHECK);
615 // bootstrap specifier index must be checked later,
616 // when BootstrapMethods attr is available
617 break;
618 }
619 default: {
620 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
621 ShouldNotReachHere();
622 break;
623 }
624 } // switch(tag)
625 } // end of for
626
627 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
628
629 if (!_need_verify) {
630 return;
631 }
632
633 // second verification pass - checks the strings are of the right format.
634 // but not yet to the other entries
635 for (index = 1; index < length; index++) {
636 const jbyte tag = cp->tag_at(index).value();
637 switch (tag) {
638 case JVM_CONSTANT_UnresolvedClass: {
639 const Symbol* const class_name = cp->klass_name_at(index);
640 // check the name
641 verify_legal_class_name(class_name, CHECK);
642 break;
643 }
644 case JVM_CONSTANT_NameAndType: {
645 if (_need_verify) {
646 const int sig_index = cp->signature_ref_index_at(index);
647 const int name_index = cp->name_ref_index_at(index);
648 const Symbol* const name = cp->symbol_at(name_index);
649 const Symbol* const sig = cp->symbol_at(sig_index);
650 guarantee_property(sig->utf8_length() != 0,
651 "Illegal zero length constant pool entry at %d in class %s",
652 sig_index, CHECK);
653 guarantee_property(name->utf8_length() != 0,
654 "Illegal zero length constant pool entry at %d in class %s",
655 name_index, CHECK);
656
657 if (Signature::is_method(sig)) {
658 // Format check method name and signature
659 verify_legal_method_name(name, CHECK);
660 verify_legal_method_signature(name, sig, CHECK);
661 } else {
662 // Format check field name and signature
663 verify_legal_field_name(name, CHECK);
664 verify_legal_field_signature(name, sig, CHECK);
665 }
666 }
667 break;
668 }
669 case JVM_CONSTANT_Dynamic: {
670 const int name_and_type_ref_index =
671 cp->uncached_name_and_type_ref_index_at(index);
672 // already verified to be utf8
673 const int name_ref_index =
674 cp->name_ref_index_at(name_and_type_ref_index);
675 // already verified to be utf8
676 const int signature_ref_index =
677 cp->signature_ref_index_at(name_and_type_ref_index);
678 const Symbol* const name = cp->symbol_at(name_ref_index);
679 const Symbol* const signature = cp->symbol_at(signature_ref_index);
680 if (_need_verify) {
681 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
682 // Need only to be sure signature is the right type.
683 if (Signature::is_method(signature)) {
684 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
685 }
686 }
687 break;
688 }
689 case JVM_CONSTANT_InvokeDynamic:
690 case JVM_CONSTANT_Fieldref:
691 case JVM_CONSTANT_Methodref:
692 case JVM_CONSTANT_InterfaceMethodref: {
693 const int name_and_type_ref_index =
694 cp->uncached_name_and_type_ref_index_at(index);
695 // already verified to be utf8
696 const int name_ref_index =
697 cp->name_ref_index_at(name_and_type_ref_index);
698 // already verified to be utf8
699 const int signature_ref_index =
700 cp->signature_ref_index_at(name_and_type_ref_index);
701 const Symbol* const name = cp->symbol_at(name_ref_index);
702 const Symbol* const signature = cp->symbol_at(signature_ref_index);
703 if (tag == JVM_CONSTANT_Fieldref) {
704 if (_need_verify) {
705 // Field name and signature are verified above, when iterating NameAndType_info.
706 // Need only to be sure signature is non-zero length and the right type.
707 if (Signature::is_method(signature)) {
708 throwIllegalSignature("Field", name, signature, CHECK);
709 }
710 }
711 } else {
712 if (_need_verify) {
713 // Method name and signature are individually verified above, when iterating
714 // NameAndType_info. Need to check here that signature is non-zero length and
715 // the right type.
716 if (!Signature::is_method(signature)) {
717 throwIllegalSignature("Method", name, signature, CHECK);
718 }
719 }
720 // If a class method name begins with '<', it must be "<init>" and have void signature.
721 const unsigned int name_len = name->utf8_length();
722 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
723 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
724 if (name != vmSymbols::object_initializer_name()) {
725 classfile_parse_error(
726 "Bad method name at constant pool index %u in class file %s",
727 name_ref_index, THREAD);
728 return;
729 } else if (!Signature::is_void_method(signature)) { // must have void signature.
730 throwIllegalSignature("Method", name, signature, CHECK);
731 }
732 }
733 }
734 break;
735 }
736 case JVM_CONSTANT_MethodHandle: {
737 const int ref_index = cp->method_handle_index_at(index);
738 const int ref_kind = cp->method_handle_ref_kind_at(index);
739 switch (ref_kind) {
740 case JVM_REF_invokeVirtual:
741 case JVM_REF_invokeStatic:
742 case JVM_REF_invokeSpecial:
743 case JVM_REF_newInvokeSpecial: {
744 const int name_and_type_ref_index =
745 cp->uncached_name_and_type_ref_index_at(ref_index);
746 const int name_ref_index =
747 cp->name_ref_index_at(name_and_type_ref_index);
748 const Symbol* const name = cp->symbol_at(name_ref_index);
749
750 if (name != vmSymbols::object_initializer_name()) { // !<init>
751 if (ref_kind == JVM_REF_newInvokeSpecial) {
752 classfile_parse_error(
753 "Bad constructor name at constant pool index %u in class file %s",
754 name_ref_index, THREAD);
755 return;
756 }
757 } else { // <init>
758 // The allowed invocation mode of <init> depends on its signature.
759 // This test corresponds to verify_invoke_instructions in the verifier.
760 const int signature_ref_index =
761 cp->signature_ref_index_at(name_and_type_ref_index);
762 const Symbol* const signature = cp->symbol_at(signature_ref_index);
763 if (signature->is_void_method_signature()
764 && ref_kind == JVM_REF_newInvokeSpecial) {
765 // OK, could be a constructor call
766 } else {
767 classfile_parse_error(
768 "Bad method name at constant pool index %u in class file %s",
769 name_ref_index, THREAD);
770 return;
771 }
772 }
773 break;
774 }
775 // Other ref_kinds are already fully checked in previous pass.
776 } // switch(ref_kind)
777 break;
778 }
779 case JVM_CONSTANT_MethodType: {
780 const Symbol* const no_name = vmSymbols::type_name(); // place holder
781 const Symbol* const signature = cp->method_type_signature_at(index);
782 verify_legal_method_signature(no_name, signature, CHECK);
783 break;
784 }
785 case JVM_CONSTANT_Utf8: {
786 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
787 }
788 } // switch(tag)
789 } // end of for
790 }
791
792 class NameSigHash: public ResourceObj {
793 public:
794 const Symbol* _name; // name
795 const Symbol* _sig; // signature
796
797 static const int HASH_ROW_SIZE = 256;
798
799 NameSigHash(Symbol* name, Symbol* sig) :
800 _name(name),
801 _sig(sig) {}
802
803 static unsigned int hash(NameSigHash const& namesig) {
804 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
805 }
806
807 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
808 return (e0._name == e1._name) &&
809 (e0._sig == e1._sig);
810 }
811 };
812
813 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
814 NameSigHash::HASH_ROW_SIZE,
815 AnyObj::RESOURCE_AREA, mtInternal,
816 &NameSigHash::hash, &NameSigHash::equals>;
817
818 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
819 assert(super_type != nullptr,"Method doesn't support null super type");
820 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
821 && super_type->super() != nullptr /* Super is not j.l.Object */) {
822 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
823 err_msg("Value type %s has an identity type as supertype",
824 current->class_name()->as_klass_external_name()));
825 }
826 }
827
828 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
829 int itfs_len,
830 ConstantPool* cp,
831 bool* const has_nonstatic_concrete_methods,
832 // FIXME: lots of these functions
833 // declare their parameters as const,
834 // which adds only noise to the code.
835 // Remove the spurious const modifiers.
836 // Many are of the form "const int x"
837 // or "T* const x".
838 TRAPS) {
839 assert(stream != nullptr, "invariant");
840 assert(cp != nullptr, "invariant");
841 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
842
843 if (itfs_len == 0) {
844 _local_interfaces = Universe::the_empty_instance_klass_array();
845
846 } else {
847 assert(itfs_len > 0, "only called for len>0");
848 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
849 int index = 0;
850 for (index = 0; index < itfs_len; index++) {
851 const u2 interface_index = stream->get_u2(CHECK);
852 check_property(
853 valid_klass_reference_at(interface_index),
854 "Interface name has bad constant pool index %u in class file %s",
855 interface_index, CHECK);
856 _local_interface_indexes->at_put_grow(index, interface_index);
857 }
858
859 if (!_need_verify || itfs_len <= 1) {
860 return;
861 }
862
863 // Check if there's any duplicates in interfaces
864 ResourceMark rm(THREAD);
865 // Set containing interface names
866 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
867 for (index = 0; index < itfs_len; index++) {
868 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
869 // If no duplicates, add (name, nullptr) in hashtable interface_names.
870 if (!interface_names->put(interface_name, 0)) {
871 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
872 interface_name->as_C_string(), THREAD);
873 return;
874 }
875 }
876 }
877 }
878
879 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
880 int constantvalue_index,
881 int signature_index,
882 TRAPS) const {
883 // Make sure the constant pool entry is of a type appropriate to this field
884 guarantee_property(
885 (constantvalue_index > 0 &&
886 constantvalue_index < cp->length()),
887 "Bad initial value index %u in ConstantValue attribute in class file %s",
888 constantvalue_index, CHECK);
889
890 const constantTag value_type = cp->tag_at(constantvalue_index);
891 switch(cp->basic_type_for_signature_at(signature_index)) {
892 case T_LONG: {
893 guarantee_property(value_type.is_long(),
894 "Inconsistent constant value type in class file %s",
895 CHECK);
896 break;
897 }
898 case T_FLOAT: {
899 guarantee_property(value_type.is_float(),
900 "Inconsistent constant value type in class file %s",
901 CHECK);
902 break;
903 }
904 case T_DOUBLE: {
905 guarantee_property(value_type.is_double(),
906 "Inconsistent constant value type in class file %s",
907 CHECK);
908 break;
909 }
910 case T_BYTE:
911 case T_CHAR:
912 case T_SHORT:
913 case T_BOOLEAN:
914 case T_INT: {
915 guarantee_property(value_type.is_int(),
916 "Inconsistent constant value type in class file %s",
917 CHECK);
918 break;
919 }
920 case T_OBJECT: {
921 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
922 && value_type.is_string()),
923 "Bad string initial value in class file %s",
924 CHECK);
925 break;
926 }
927 default: {
928 classfile_parse_error("Unable to set initial value %u in class file %s",
929 constantvalue_index,
930 THREAD);
931 }
932 }
933 }
934
935 class AnnotationCollector : public ResourceObj{
936 public:
937 enum Location { _in_field, _in_method, _in_class };
938 enum ID {
939 _unknown = 0,
940 _method_CallerSensitive,
941 _method_ForceInline,
942 _method_DontInline,
943 _method_ChangesCurrentThread,
944 _method_JvmtiMountTransition,
945 _method_InjectedProfile,
946 _method_LambdaForm_Compiled,
947 _method_Hidden,
948 _method_Scoped,
949 _method_IntrinsicCandidate,
950 _jdk_internal_vm_annotation_Contended,
951 _field_Stable,
952 _jdk_internal_vm_annotation_ReservedStackAccess,
953 _jdk_internal_ValueBased,
954 _jdk_internal_ImplicitlyConstructible,
955 _jdk_internal_LooselyConsistentValue,
956 _jdk_internal_NullRestricted,
957 _java_lang_Deprecated,
958 _java_lang_Deprecated_for_removal,
959 _annotation_LIMIT
960 };
961 const Location _location;
962 int _annotations_present;
963 u2 _contended_group;
964
965 AnnotationCollector(Location location)
966 : _location(location), _annotations_present(0), _contended_group(0)
967 {
968 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
969 }
970 // If this annotation name has an ID, report it (or _none).
971 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
972 // Set the annotation name:
973 void set_annotation(ID id) {
974 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
975 _annotations_present |= (int)nth_bit((int)id);
976 }
977
978 void remove_annotation(ID id) {
979 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
980 _annotations_present &= (int)~nth_bit((int)id);
981 }
982
983 // Report if the annotation is present.
984 bool has_any_annotations() const { return _annotations_present != 0; }
985 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
986
987 void set_contended_group(u2 group) { _contended_group = group; }
988 u2 contended_group() const { return _contended_group; }
989
990 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
991
992 void set_stable(bool stable) { set_annotation(_field_Stable); }
993 bool is_stable() const { return has_annotation(_field_Stable); }
994 };
995
996 // This class also doubles as a holder for metadata cleanup.
997 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
998 private:
999 ClassLoaderData* _loader_data;
1000 AnnotationArray* _field_annotations;
1001 AnnotationArray* _field_type_annotations;
1002 public:
1003 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1004 AnnotationCollector(_in_field),
1005 _loader_data(loader_data),
1006 _field_annotations(nullptr),
1007 _field_type_annotations(nullptr) {}
1008 ~FieldAnnotationCollector();
1009 void apply_to(FieldInfo* f);
1010 AnnotationArray* field_annotations() { return _field_annotations; }
1011 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1012
1013 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1014 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1015 };
1016
1017 class MethodAnnotationCollector : public AnnotationCollector{
1018 public:
1019 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1020 void apply_to(const methodHandle& m);
1021 };
1022
1023 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1024 public:
1025 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1026 void apply_to(InstanceKlass* ik);
1027 };
1028
1029
1030 static int skip_annotation_value(const u1*, int, int); // fwd decl
1031
1032 // Safely increment index by val if does not pass limit
1033 #define SAFE_ADD(index, limit, val) \
1034 if (index >= limit - val) return limit; \
1035 index += val;
1036
1037 // Skip an annotation. Return >=limit if there is any problem.
1038 static int skip_annotation(const u1* buffer, int limit, int index) {
1039 assert(buffer != nullptr, "invariant");
1040 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1041 // value := switch (tag:u1) { ... }
1042 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1043 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1044 while (--nmem >= 0 && index < limit) {
1045 SAFE_ADD(index, limit, 2); // skip member
1046 index = skip_annotation_value(buffer, limit, index);
1047 }
1048 return index;
1049 }
1050
1051 // Skip an annotation value. Return >=limit if there is any problem.
1052 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1053 assert(buffer != nullptr, "invariant");
1054
1055 // value := switch (tag:u1) {
1056 // case B, C, I, S, Z, D, F, J, c: con:u2;
1057 // case e: e_class:u2 e_name:u2;
1058 // case s: s_con:u2;
1059 // case [: do(nval:u2) {value};
1060 // case @: annotation;
1061 // case s: s_con:u2;
1062 // }
1063 SAFE_ADD(index, limit, 1); // read tag
1064 const u1 tag = buffer[index - 1];
1065 switch (tag) {
1066 case 'B':
1067 case 'C':
1068 case 'I':
1069 case 'S':
1070 case 'Z':
1071 case 'D':
1072 case 'F':
1073 case 'J':
1074 case 'c':
1075 case 's':
1076 SAFE_ADD(index, limit, 2); // skip con or s_con
1077 break;
1078 case 'e':
1079 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1080 break;
1081 case '[':
1082 {
1083 SAFE_ADD(index, limit, 2); // read nval
1084 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1085 while (--nval >= 0 && index < limit) {
1086 index = skip_annotation_value(buffer, limit, index);
1087 }
1088 }
1089 break;
1090 case '@':
1091 index = skip_annotation(buffer, limit, index);
1092 break;
1093 default:
1094 return limit; // bad tag byte
1095 }
1096 return index;
1097 }
1098
1099 // Sift through annotations, looking for those significant to the VM:
1100 static void parse_annotations(const ConstantPool* const cp,
1101 const u1* buffer, int limit,
1102 AnnotationCollector* coll,
1103 ClassLoaderData* loader_data,
1104 const bool can_access_vm_annotations) {
1105
1106 assert(cp != nullptr, "invariant");
1107 assert(buffer != nullptr, "invariant");
1108 assert(coll != nullptr, "invariant");
1109 assert(loader_data != nullptr, "invariant");
1110
1111 // annotations := do(nann:u2) {annotation}
1112 int index = 2; // read nann
1113 if (index >= limit) return;
1114 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1115 enum { // initial annotation layout
1116 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1117 count_off = 2, // u2 such as 1 (one value)
1118 member_off = 4, // utf8 such as 'value'
1119 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1120 e_tag_val = 'e',
1121 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1122 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1123 e_size = 11, // end of 'e' annotation
1124 c_tag_val = 'c', // payload is type
1125 c_con_off = 7, // utf8 payload, such as 'I'
1126 c_size = 9, // end of 'c' annotation
1127 s_tag_val = 's', // payload is String
1128 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1129 s_size = 9,
1130 b_tag_val = 'Z', // payload is boolean
1131 min_size = 6 // smallest possible size (zero members)
1132 };
1133 // Cannot add min_size to index in case of overflow MAX_INT
1134 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1135 int index0 = index;
1136 index = skip_annotation(buffer, limit, index);
1137 const u1* const abase = buffer + index0;
1138 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1139 const int count = Bytes::get_Java_u2((address)abase + count_off);
1140 const Symbol* const aname = check_symbol_at(cp, atype);
1141 if (aname == nullptr) break; // invalid annotation name
1142 const Symbol* member = nullptr;
1143 if (count >= 1) {
1144 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1145 member = check_symbol_at(cp, member_index);
1146 if (member == nullptr) break; // invalid member name
1147 }
1148
1149 // Here is where parsing particular annotations will take place.
1150 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1151 if (AnnotationCollector::_unknown == id) continue;
1152 coll->set_annotation(id);
1153 if (AnnotationCollector::_java_lang_Deprecated == id) {
1154 assert(count <= 2, "change this if more element-value pairs are added to the @Deprecated annotation");
1155 // @Deprecated can specify forRemoval=true
1156 const u1* offset = abase + member_off;
1157 for (int i = 0; i < count; ++i) {
1158 int member_index = Bytes::get_Java_u2((address)offset);
1159 offset += 2;
1160 member = check_symbol_at(cp, member_index);
1161 if (member == vmSymbols::since()) {
1162 assert(*((address)offset) == s_tag_val, "invariant");
1163 offset += 3;
1164 continue;
1165 }
1166 if (member == vmSymbols::for_removal()) {
1167 assert(*((address)offset) == b_tag_val, "invariant");
1168 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1169 if (cp->int_at(boolean_value_index) == 1) {
1170 // forRemoval == true
1171 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1172 }
1173 break;
1174 }
1175
1176 }
1177 continue;
1178 }
1179
1180 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1181 // @Contended can optionally specify the contention group.
1182 //
1183 // Contended group defines the equivalence class over the fields:
1184 // the fields within the same contended group are not treated distinct.
1185 // The only exception is default group, which does not incur the
1186 // equivalence. Naturally, contention group for classes is meaningless.
1187 //
1188 // While the contention group is specified as String, annotation
1189 // values are already interned, and we might as well use the constant
1190 // pool index as the group tag.
1191 //
1192 u2 group_index = 0; // default contended group
1193 if (count == 1
1194 && s_size == (index - index0) // match size
1195 && s_tag_val == *(abase + tag_off)
1196 && member == vmSymbols::value_name()) {
1197 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1198 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1199 group_index = 0; // default contended group
1200 }
1201 }
1202 coll->set_contended_group(group_index);
1203 }
1204 }
1205 }
1206
1207
1208 // Parse attributes for a field.
1209 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1210 u2 attributes_count,
1211 bool is_static, u2 signature_index,
1212 u2* const constantvalue_index_addr,
1213 bool* const is_synthetic_addr,
1214 u2* const generic_signature_index_addr,
1215 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1216 TRAPS) {
1217 assert(cfs != nullptr, "invariant");
1218 assert(constantvalue_index_addr != nullptr, "invariant");
1219 assert(is_synthetic_addr != nullptr, "invariant");
1220 assert(generic_signature_index_addr != nullptr, "invariant");
1221 assert(parsed_annotations != nullptr, "invariant");
1222 assert(attributes_count > 0, "attributes_count should be greater than 0");
1223
1224 u2 constantvalue_index = 0;
1225 u2 generic_signature_index = 0;
1226 bool is_synthetic = false;
1227 const u1* runtime_visible_annotations = nullptr;
1228 int runtime_visible_annotations_length = 0;
1229 const u1* runtime_invisible_annotations = nullptr;
1230 int runtime_invisible_annotations_length = 0;
1231 const u1* runtime_visible_type_annotations = nullptr;
1232 int runtime_visible_type_annotations_length = 0;
1233 const u1* runtime_invisible_type_annotations = nullptr;
1234 int runtime_invisible_type_annotations_length = 0;
1235 bool runtime_invisible_annotations_exists = false;
1236 bool runtime_invisible_type_annotations_exists = false;
1237 const ConstantPool* const cp = _cp;
1238
1239 while (attributes_count--) {
1240 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1241 const u2 attribute_name_index = cfs->get_u2_fast();
1242 const u4 attribute_length = cfs->get_u4_fast();
1243 check_property(valid_symbol_at(attribute_name_index),
1244 "Invalid field attribute index %u in class file %s",
1245 attribute_name_index,
1246 CHECK);
1247
1248 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1249 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1250 // ignore if non-static
1251 if (constantvalue_index != 0) {
1252 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1253 return;
1254 }
1255 check_property(
1256 attribute_length == 2,
1257 "Invalid ConstantValue field attribute length %u in class file %s",
1258 attribute_length, CHECK);
1259
1260 constantvalue_index = cfs->get_u2(CHECK);
1261 if (_need_verify) {
1262 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1263 }
1264 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1265 if (attribute_length != 0) {
1266 classfile_parse_error(
1267 "Invalid Synthetic field attribute length %u in class file %s",
1268 attribute_length, THREAD);
1269 return;
1270 }
1271 is_synthetic = true;
1272 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1273 if (attribute_length != 0) {
1274 classfile_parse_error(
1275 "Invalid Deprecated field attribute length %u in class file %s",
1276 attribute_length, THREAD);
1277 return;
1278 }
1279 } else if (_major_version >= JAVA_1_5_VERSION) {
1280 if (attribute_name == vmSymbols::tag_signature()) {
1281 if (generic_signature_index != 0) {
1282 classfile_parse_error(
1283 "Multiple Signature attributes for field in class file %s", THREAD);
1284 return;
1285 }
1286 if (attribute_length != 2) {
1287 classfile_parse_error(
1288 "Wrong size %u for field's Signature attribute in class file %s",
1289 attribute_length, THREAD);
1290 return;
1291 }
1292 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1293 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1294 if (runtime_visible_annotations != nullptr) {
1295 classfile_parse_error(
1296 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1297 return;
1298 }
1299 runtime_visible_annotations_length = attribute_length;
1300 runtime_visible_annotations = cfs->current();
1301 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1302 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1303 parse_annotations(cp,
1304 runtime_visible_annotations,
1305 runtime_visible_annotations_length,
1306 parsed_annotations,
1307 _loader_data,
1308 _can_access_vm_annotations);
1309 cfs->skip_u1_fast(runtime_visible_annotations_length);
1310 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1311 if (runtime_invisible_annotations_exists) {
1312 classfile_parse_error(
1313 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1314 return;
1315 }
1316 runtime_invisible_annotations_exists = true;
1317 if (PreserveAllAnnotations) {
1318 runtime_invisible_annotations_length = attribute_length;
1319 runtime_invisible_annotations = cfs->current();
1320 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
1321 }
1322 cfs->skip_u1(attribute_length, CHECK);
1323 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1324 if (runtime_visible_type_annotations != nullptr) {
1325 classfile_parse_error(
1326 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1327 return;
1328 }
1329 runtime_visible_type_annotations_length = attribute_length;
1330 runtime_visible_type_annotations = cfs->current();
1331 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1332 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1333 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1334 if (runtime_invisible_type_annotations_exists) {
1335 classfile_parse_error(
1336 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1337 return;
1338 } else {
1339 runtime_invisible_type_annotations_exists = true;
1340 }
1341 if (PreserveAllAnnotations) {
1342 runtime_invisible_type_annotations_length = attribute_length;
1343 runtime_invisible_type_annotations = cfs->current();
1344 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
1345 }
1346 cfs->skip_u1(attribute_length, CHECK);
1347 } else {
1348 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1349 }
1350 } else {
1351 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1352 }
1353 }
1354
1355 *constantvalue_index_addr = constantvalue_index;
1356 *is_synthetic_addr = is_synthetic;
1357 *generic_signature_index_addr = generic_signature_index;
1358 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1359 runtime_visible_annotations_length,
1360 runtime_invisible_annotations,
1361 runtime_invisible_annotations_length,
1362 CHECK);
1363 parsed_annotations->set_field_annotations(a);
1364 a = assemble_annotations(runtime_visible_type_annotations,
1365 runtime_visible_type_annotations_length,
1366 runtime_invisible_type_annotations,
1367 runtime_invisible_type_annotations_length,
1368 CHECK);
1369 parsed_annotations->set_field_type_annotations(a);
1370 return;
1371 }
1372
1373
1374 // Field allocation types. Used for computing field offsets.
1375
1376 enum FieldAllocationType {
1377 STATIC_OOP, // Oops
1378 STATIC_BYTE, // Boolean, Byte, char
1379 STATIC_SHORT, // shorts
1380 STATIC_WORD, // ints
1381 STATIC_DOUBLE, // aligned long or double
1382 STATIC_INLINE, // inline type field
1383 NONSTATIC_OOP,
1384 NONSTATIC_BYTE,
1385 NONSTATIC_SHORT,
1386 NONSTATIC_WORD,
1387 NONSTATIC_DOUBLE,
1388 NONSTATIC_INLINE,
1389 MAX_FIELD_ALLOCATION_TYPE,
1390 BAD_ALLOCATION_TYPE = -1
1391 };
1392
1393 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1394 BAD_ALLOCATION_TYPE, // 0
1395 BAD_ALLOCATION_TYPE, // 1
1396 BAD_ALLOCATION_TYPE, // 2
1397 BAD_ALLOCATION_TYPE, // 3
1398 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1399 NONSTATIC_SHORT, // T_CHAR = 5,
1400 NONSTATIC_WORD, // T_FLOAT = 6,
1401 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1402 NONSTATIC_BYTE, // T_BYTE = 8,
1403 NONSTATIC_SHORT, // T_SHORT = 9,
1404 NONSTATIC_WORD, // T_INT = 10,
1405 NONSTATIC_DOUBLE, // T_LONG = 11,
1406 NONSTATIC_OOP, // T_OBJECT = 12,
1407 NONSTATIC_OOP, // T_ARRAY = 13,
1408 NONSTATIC_OOP, // T_PRIMITIVE_OBJECT = 14,
1409 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1410 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1411 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1412 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1413 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1414 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1415 BAD_ALLOCATION_TYPE, // 0
1416 BAD_ALLOCATION_TYPE, // 1
1417 BAD_ALLOCATION_TYPE, // 2
1418 BAD_ALLOCATION_TYPE, // 3
1419 STATIC_BYTE , // T_BOOLEAN = 4,
1420 STATIC_SHORT, // T_CHAR = 5,
1421 STATIC_WORD, // T_FLOAT = 6,
1422 STATIC_DOUBLE, // T_DOUBLE = 7,
1423 STATIC_BYTE, // T_BYTE = 8,
1424 STATIC_SHORT, // T_SHORT = 9,
1425 STATIC_WORD, // T_INT = 10,
1426 STATIC_DOUBLE, // T_LONG = 11,
1427 STATIC_OOP, // T_OBJECT = 12,
1428 STATIC_OOP, // T_ARRAY = 13,
1429 STATIC_OOP, // T_PRIMITIVE_OBJECT = 14,
1430 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1431 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1432 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1433 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1434 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1435 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1436 };
1437
1438 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_inline_type) {
1439 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1440 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1441 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1442 if (is_inline_type) {
1443 result = is_static ? STATIC_INLINE : NONSTATIC_INLINE;
1444 }
1445 return result;
1446 }
1447
1448 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1449 public:
1450 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1451
1452 FieldAllocationCount() {
1453 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1454 count[i] = 0;
1455 }
1456 }
1457
1458 void update(bool is_static, BasicType type, bool is_inline_type) {
1459 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_inline_type);
1460 if (atype != BAD_ALLOCATION_TYPE) {
1461 // Make sure there is no overflow with injected fields.
1462 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1463 count[atype]++;
1464 }
1465 }
1466 };
1467
1468 // Side-effects: populates the _fields, _fields_annotations,
1469 // _fields_type_annotations fields
1470 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1471 AccessFlags class_access_flags,
1472 FieldAllocationCount* const fac,
1473 ConstantPool* cp,
1474 const int cp_size,
1475 u2* const java_fields_count_ptr,
1476 TRAPS) {
1477
1478 assert(cfs != nullptr, "invariant");
1479 assert(fac != nullptr, "invariant");
1480 assert(cp != nullptr, "invariant");
1481 assert(java_fields_count_ptr != nullptr, "invariant");
1482
1483 assert(nullptr == _fields_annotations, "invariant");
1484 assert(nullptr == _fields_type_annotations, "invariant");
1485
1486 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1487 cfs->guarantee_more(2, CHECK); // length
1488 const u2 length = cfs->get_u2_fast();
1489 *java_fields_count_ptr = length;
1490
1491 int num_injected = 0;
1492 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1493 &num_injected);
1494
1495 // two more slots are required for inline classes:
1496 // one for the static field with a reference to the pre-allocated default value
1497 // one for the field the JVM injects when detecting an empty inline class
1498 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1499
1500 // Allocate a temporary resource array to collect field data.
1501 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1502 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1503
1504 int instance_fields_count = 0;
1505 ResourceMark rm(THREAD);
1506 for (int n = 0; n < length; n++) {
1507 // access_flags, name_index, descriptor_index, attributes_count
1508 cfs->guarantee_more(8, CHECK);
1509
1510 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1511
1512 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1513 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1514 AccessFlags access_flags;
1515 access_flags.set_flags(flags);
1516 FieldInfo::FieldFlags fieldFlags(0);
1517
1518 const u2 name_index = cfs->get_u2_fast();
1519 check_property(valid_symbol_at(name_index),
1520 "Invalid constant pool index %u for field name in class file %s",
1521 name_index, CHECK);
1522 const Symbol* const name = cp->symbol_at(name_index);
1523 verify_legal_field_name(name, CHECK);
1524
1525 const u2 signature_index = cfs->get_u2_fast();
1526 check_property(valid_symbol_at(signature_index),
1527 "Invalid constant pool index %u for field signature in class file %s",
1528 signature_index, CHECK);
1529 const Symbol* const sig = cp->symbol_at(signature_index);
1530 verify_legal_field_signature(name, sig, CHECK);
1531 if (!access_flags.is_static()) instance_fields_count++;
1532
1533 u2 constantvalue_index = 0;
1534 bool is_synthetic = false;
1535 u2 generic_signature_index = 0;
1536 const bool is_static = access_flags.is_static();
1537 FieldAnnotationCollector parsed_annotations(_loader_data);
1538
1539 bool is_null_restricted = false;
1540
1541 const u2 attributes_count = cfs->get_u2_fast();
1542 if (attributes_count > 0) {
1543 parse_field_attributes(cfs,
1544 attributes_count,
1545 is_static,
1546 signature_index,
1547 &constantvalue_index,
1548 &is_synthetic,
1549 &generic_signature_index,
1550 &parsed_annotations,
1551 CHECK);
1552
1553 if (parsed_annotations.field_annotations() != nullptr) {
1554 if (_fields_annotations == nullptr) {
1555 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1556 _loader_data, length, nullptr,
1557 CHECK);
1558 }
1559 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1560 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1561 if (!Signature::has_envelope(sig)) {
1562 Exceptions::fthrow(
1563 THREAD_AND_LOCATION,
1564 vmSymbols::java_lang_ClassFormatError(),
1565 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s with signature %s (primitive types can never be null)",
1566 name->as_C_string(), sig->as_C_string());
1567 }
1568 is_null_restricted = true;
1569 }
1570 parsed_annotations.set_field_annotations(nullptr);
1571 }
1572 if (parsed_annotations.field_type_annotations() != nullptr) {
1573 if (_fields_type_annotations == nullptr) {
1574 _fields_type_annotations =
1575 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1576 length,
1577 nullptr,
1578 CHECK);
1579 }
1580 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1581 parsed_annotations.set_field_type_annotations(nullptr);
1582 }
1583
1584 if (is_synthetic) {
1585 access_flags.set_is_synthetic();
1586 }
1587 if (generic_signature_index != 0) {
1588 fieldFlags.update_generic(true);
1589 }
1590 }
1591
1592 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1593
1594 // Update FieldAllocationCount for this kind of field
1595 // This use of T_PRIMITIVE_OBJECT is not valid anymore => FIXME (relate to cleanup (removal?) of FiedAllocationCount
1596 fac->update(is_static, type, type == T_PRIMITIVE_OBJECT);
1597
1598 if (is_null_restricted) fieldFlags.update_null_free_inline_type(true);
1599
1600 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1601 fi.set_index(n);
1602 if (fieldFlags.is_generic()) {
1603 fi.set_generic_signature_index(generic_signature_index);
1604 }
1605 parsed_annotations.apply_to(&fi);
1606 if (fi.field_flags().is_contended()) {
1607 _has_contended_fields = true;
1608 }
1609 _temp_field_info->append(fi);
1610 }
1611 assert(_temp_field_info->length() == length, "Must be");
1612
1613 int index = length;
1614 if (num_injected != 0) {
1615 for (int n = 0; n < num_injected; n++) {
1616 // Check for duplicates
1617 if (injected[n].may_be_java) {
1618 const Symbol* const name = injected[n].name();
1619 const Symbol* const signature = injected[n].signature();
1620 bool duplicate = false;
1621 for (int i = 0; i < length; i++) {
1622 const FieldInfo* const f = _temp_field_info->adr_at(i);
1623 if (name == cp->symbol_at(f->name_index()) &&
1624 signature == cp->symbol_at(f->signature_index())) {
1625 // Symbol is desclared in Java so skip this one
1626 duplicate = true;
1627 break;
1628 }
1629 }
1630 if (duplicate) {
1631 // These will be removed from the field array at the end
1632 continue;
1633 }
1634 }
1635
1636 // Injected field
1637 FieldInfo::FieldFlags fflags(0);
1638 fflags.update_injected(true);
1639 AccessFlags aflags;
1640 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1641 fi.set_index(index);
1642 _temp_field_info->append(fi);
1643
1644 // Update FieldAllocationCount for this kind of field
1645 const BasicType type = Signature::basic_type(injected[n].signature());
1646 fac->update(false, type, false);
1647 index++;
1648 }
1649 }
1650
1651 if (is_inline_type) {
1652 // Inject static ".default" field
1653 FieldInfo::FieldFlags fflags(0);
1654 fflags.update_injected(true);
1655 AccessFlags aflags(JVM_ACC_STATIC);
1656 FieldInfo fi(aflags,
1657 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1658 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1659 0,
1660 fflags);
1661 fi.set_index(index);
1662 _temp_field_info->append(fi);
1663
1664 const BasicType type = Signature::basic_type(vmSymbols::object_signature());
1665 fac->update(true, type, false);
1666 index++;
1667 }
1668
1669 if (is_inline_type && instance_fields_count == 0) {
1670 // Inject ".empty" dummy field
1671 _is_empty_inline_type = true;
1672
1673 FieldInfo::FieldFlags fflags(0);
1674 fflags.update_injected(true);
1675 AccessFlags aflags;
1676 FieldInfo fi(aflags,
1677 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(empty_marker_name)),
1678 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(byte_signature)),
1679 0,
1680 fflags);
1681 fi.set_index(index);
1682 _temp_field_info->append(fi);
1683
1684 const BasicType type = Signature::basic_type(vmSymbols::byte_signature());
1685 fac->update(false, type, false);
1686 index++;
1687 }
1688
1689 if (instance_fields_count > 0) {
1690 _has_nonstatic_fields = true;
1691 }
1692
1693 assert(_temp_field_info->length() == index, "Must be");
1694
1695 if (_need_verify && length > 1) {
1696 // Check duplicated fields
1697 ResourceMark rm(THREAD);
1698 // Set containing name-signature pairs
1699 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1700 for (int i = 0; i < _temp_field_info->length(); i++) {
1701 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1702 _temp_field_info->adr_at(i)->signature(_cp));
1703 // If no duplicates, add name/signature in hashtable names_and_sigs.
1704 if(!names_and_sigs->put(name_and_sig, 0)) {
1705 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1706 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1707 return;
1708 }
1709 }
1710 }
1711 }
1712
1713
1714 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1715 u4 code_length,
1716 u4 exception_table_length,
1717 TRAPS) {
1718 assert(cfs != nullptr, "invariant");
1719
1720 const unsafe_u2* const exception_table_start = cfs->current();
1721 assert(exception_table_start != nullptr, "null exception table");
1722
1723 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1724 // end_pc,
1725 // handler_pc,
1726 // catch_type_index
1727
1728 // Will check legal target after parsing code array in verifier.
1729 if (_need_verify) {
1730 for (unsigned int i = 0; i < exception_table_length; i++) {
1731 const u2 start_pc = cfs->get_u2_fast();
1732 const u2 end_pc = cfs->get_u2_fast();
1733 const u2 handler_pc = cfs->get_u2_fast();
1734 const u2 catch_type_index = cfs->get_u2_fast();
1735 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1736 "Illegal exception table range in class file %s",
1737 CHECK_NULL);
1738 guarantee_property(handler_pc < code_length,
1739 "Illegal exception table handler in class file %s",
1740 CHECK_NULL);
1741 if (catch_type_index != 0) {
1742 guarantee_property(valid_klass_reference_at(catch_type_index),
1743 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1744 }
1745 }
1746 } else {
1747 cfs->skip_u2_fast(exception_table_length * 4);
1748 }
1749 return exception_table_start;
1750 }
1751
1752 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1753 u4 code_length,
1754 CompressedLineNumberWriteStream**const write_stream,
1755 TRAPS) {
1756
1757 const ClassFileStream* const cfs = _stream;
1758 unsigned int num_entries = cfs->get_u2(CHECK);
1759
1760 // Each entry is a u2 start_pc, and a u2 line_number
1761 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1762
1763 // Verify line number attribute and table length
1764 check_property(
1765 code_attribute_length == sizeof(u2) + length_in_bytes,
1766 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1767
1768 cfs->guarantee_more(length_in_bytes, CHECK);
1769
1770 if ((*write_stream) == nullptr) {
1771 if (length_in_bytes > fixed_buffer_size) {
1772 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1773 } else {
1774 (*write_stream) = new CompressedLineNumberWriteStream(
1775 _linenumbertable_buffer, fixed_buffer_size);
1776 }
1777 }
1778
1779 while (num_entries-- > 0) {
1780 const u2 bci = cfs->get_u2_fast(); // start_pc
1781 const u2 line = cfs->get_u2_fast(); // line_number
1782 guarantee_property(bci < code_length,
1783 "Invalid pc in LineNumberTable in class file %s", CHECK);
1784 (*write_stream)->write_pair(bci, line);
1785 }
1786 }
1787
1788
1789 class LVT_Hash : public AllStatic {
1790 public:
1791
1792 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1793 /*
1794 * 3-tuple start_bci/length/slot has to be unique key,
1795 * so the following comparison seems to be redundant:
1796 * && elem->name_cp_index == entry->_elem->name_cp_index
1797 */
1798 return (e0.start_bci == e1.start_bci &&
1799 e0.length == e1.length &&
1800 e0.name_cp_index == e1.name_cp_index &&
1801 e0.slot == e1.slot);
1802 }
1803
1804 static unsigned int hash(LocalVariableTableElement const& e0) {
1805 unsigned int raw_hash = e0.start_bci;
1806
1807 raw_hash = e0.length + raw_hash * 37;
1808 raw_hash = e0.name_cp_index + raw_hash * 37;
1809 raw_hash = e0.slot + raw_hash * 37;
1810
1811 return raw_hash;
1812 }
1813 };
1814
1815
1816 // Class file LocalVariableTable elements.
1817 class Classfile_LVT_Element {
1818 public:
1819 u2 start_bci;
1820 u2 length;
1821 u2 name_cp_index;
1822 u2 descriptor_cp_index;
1823 u2 slot;
1824 };
1825
1826 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1827 LocalVariableTableElement* const lvt) {
1828 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1829 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1830 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1831 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1832 lvt->signature_cp_index = 0;
1833 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1834 }
1835
1836 // Function is used to parse both attributes:
1837 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1838 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1839 u4 code_length,
1840 u2 max_locals,
1841 u4 code_attribute_length,
1842 u2* const localvariable_table_length,
1843 bool isLVTT,
1844 TRAPS) {
1845 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1846 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1847 const unsigned int size = checked_cast<unsigned>(
1848 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1849
1850 const ConstantPool* const cp = _cp;
1851
1852 // Verify local variable table attribute has right length
1853 if (_need_verify) {
1854 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1855 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1856 }
1857
1858 const unsafe_u2* const localvariable_table_start = cfs->current();
1859 assert(localvariable_table_start != nullptr, "null local variable table");
1860 if (!_need_verify) {
1861 cfs->skip_u2_fast(size);
1862 } else {
1863 cfs->guarantee_more(size * 2, CHECK_NULL);
1864 for(int i = 0; i < (*localvariable_table_length); i++) {
1865 const u2 start_pc = cfs->get_u2_fast();
1866 const u2 length = cfs->get_u2_fast();
1867 const u2 name_index = cfs->get_u2_fast();
1868 const u2 descriptor_index = cfs->get_u2_fast();
1869 const u2 index = cfs->get_u2_fast();
1870 // Assign to a u4 to avoid overflow
1871 const u4 end_pc = (u4)start_pc + (u4)length;
1872
1873 if (start_pc >= code_length) {
1874 classfile_parse_error(
1875 "Invalid start_pc %u in %s in class file %s",
1876 start_pc, tbl_name, THREAD);
1877 return nullptr;
1878 }
1879 if (end_pc > code_length) {
1880 classfile_parse_error(
1881 "Invalid length %u in %s in class file %s",
1882 length, tbl_name, THREAD);
1883 return nullptr;
1884 }
1885 const int cp_size = cp->length();
1886 guarantee_property(valid_symbol_at(name_index),
1887 "Name index %u in %s has bad constant type in class file %s",
1888 name_index, tbl_name, CHECK_NULL);
1889 guarantee_property(valid_symbol_at(descriptor_index),
1890 "Signature index %u in %s has bad constant type in class file %s",
1891 descriptor_index, tbl_name, CHECK_NULL);
1892
1893 const Symbol* const name = cp->symbol_at(name_index);
1894 const Symbol* const sig = cp->symbol_at(descriptor_index);
1895 verify_legal_field_name(name, CHECK_NULL);
1896 u2 extra_slot = 0;
1897 if (!isLVTT) {
1898 verify_legal_field_signature(name, sig, CHECK_NULL);
1899
1900 // 4894874: check special cases for double and long local variables
1901 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1902 sig == vmSymbols::type_signature(T_LONG)) {
1903 extra_slot = 1;
1904 }
1905 }
1906 guarantee_property((index + extra_slot) < max_locals,
1907 "Invalid index %u in %s in class file %s",
1908 index, tbl_name, CHECK_NULL);
1909 }
1910 }
1911 return localvariable_table_start;
1912 }
1913
1914 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1915 u4 code_attribute_length,
1916 TRAPS) {
1917 assert(cfs != nullptr, "invariant");
1918
1919 if (0 == code_attribute_length) {
1920 return nullptr;
1921 }
1922
1923 const u1* const stackmap_table_start = cfs->current();
1924 assert(stackmap_table_start != nullptr, "null stackmap table");
1925
1926 // check code_attribute_length
1927 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1928
1929 return stackmap_table_start;
1930 }
1931
1932 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1933 u2* const checked_exceptions_length,
1934 u4 method_attribute_length,
1935 TRAPS) {
1936 assert(cfs != nullptr, "invariant");
1937 assert(checked_exceptions_length != nullptr, "invariant");
1938
1939 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1940 *checked_exceptions_length = cfs->get_u2_fast();
1941 const unsigned int size =
1942 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1943 const unsafe_u2* const checked_exceptions_start = cfs->current();
1944 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1945 if (!_need_verify) {
1946 cfs->skip_u2_fast(size);
1947 } else {
1948 // Verify each value in the checked exception table
1949 u2 checked_exception;
1950 const u2 len = *checked_exceptions_length;
1951 cfs->guarantee_more(2 * len, CHECK_NULL);
1952 for (int i = 0; i < len; i++) {
1953 checked_exception = cfs->get_u2_fast();
1954 check_property(
1955 valid_klass_reference_at(checked_exception),
1956 "Exception name has bad type at constant pool %u in class file %s",
1957 checked_exception, CHECK_NULL);
1958 }
1959 }
1960 // check exceptions attribute length
1961 if (_need_verify) {
1962 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1963 sizeof(u2) * size),
1964 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1965 }
1966 return checked_exceptions_start;
1967 }
1968
1969 void ClassFileParser::throwIllegalSignature(const char* type,
1970 const Symbol* name,
1971 const Symbol* sig,
1972 TRAPS) const {
1973 assert(name != nullptr, "invariant");
1974 assert(sig != nullptr, "invariant");
1975
1976 ResourceMark rm(THREAD);
1977 Exceptions::fthrow(THREAD_AND_LOCATION,
1978 vmSymbols::java_lang_ClassFormatError(),
1979 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1980 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1981 }
1982
1983 AnnotationCollector::ID
1984 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1985 const Symbol* name,
1986 const bool can_access_vm_annotations) {
1987 const vmSymbolID sid = vmSymbols::find_sid(name);
1988 // Privileged code can use all annotations. Other code silently drops some.
1989 const bool privileged = loader_data->is_boot_class_loader_data() ||
1990 loader_data->is_platform_class_loader_data() ||
1991 can_access_vm_annotations;
1992 switch (sid) {
1993 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1994 if (_location != _in_method) break; // only allow for methods
1995 if (!privileged) break; // only allow in privileged code
1996 return _method_CallerSensitive;
1997 }
1998 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1999 if (_location != _in_method) break; // only allow for methods
2000 if (!privileged) break; // only allow in privileged code
2001 return _method_ForceInline;
2002 }
2003 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2004 if (_location != _in_method) break; // only allow for methods
2005 if (!privileged) break; // only allow in privileged code
2006 return _method_DontInline;
2007 }
2008 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
2009 if (_location != _in_method) break; // only allow for methods
2010 if (!privileged) break; // only allow in privileged code
2011 return _method_ChangesCurrentThread;
2012 }
2013 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
2014 if (_location != _in_method) break; // only allow for methods
2015 if (!privileged) break; // only allow in privileged code
2016 return _method_JvmtiMountTransition;
2017 }
2018 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2019 if (_location != _in_method) break; // only allow for methods
2020 if (!privileged) break; // only allow in privileged code
2021 return _method_InjectedProfile;
2022 }
2023 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2024 if (_location != _in_method) break; // only allow for methods
2025 if (!privileged) break; // only allow in privileged code
2026 return _method_LambdaForm_Compiled;
2027 }
2028 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2029 if (_location != _in_method) break; // only allow for methods
2030 if (!privileged) break; // only allow in privileged code
2031 return _method_Hidden;
2032 }
2033 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
2034 if (_location != _in_method) break; // only allow for methods
2035 if (!privileged) break; // only allow in privileged code
2036 return _method_Scoped;
2037 }
2038 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
2039 if (_location != _in_method) break; // only allow for methods
2040 if (!privileged) break; // only allow in privileged code
2041 return _method_IntrinsicCandidate;
2042 }
2043 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2044 if (_location != _in_field) break; // only allow for fields
2045 if (!privileged) break; // only allow in privileged code
2046 return _field_Stable;
2047 }
2048 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2049 if (_location != _in_field && _location != _in_class) {
2050 break; // only allow for fields and classes
2051 }
2052 if (!EnableContended || (RestrictContended && !privileged)) {
2053 break; // honor privileges
2054 }
2055 return _jdk_internal_vm_annotation_Contended;
2056 }
2057 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2058 if (_location != _in_method) break; // only allow for methods
2059 if (RestrictReservedStack && !privileged) break; // honor privileges
2060 return _jdk_internal_vm_annotation_ReservedStackAccess;
2061 }
2062 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
2063 if (_location != _in_class) break; // only allow for classes
2064 if (!privileged) break; // only allow in privileged code
2065 return _jdk_internal_ValueBased;
2066 }
2067 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ImplicitlyConstructible_signature): {
2068 if (_location != _in_class) break; // only allow for classes
2069 return _jdk_internal_ImplicitlyConstructible;
2070 }
2071 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2072 if (_location != _in_class) break; // only allow for classes
2073 return _jdk_internal_LooselyConsistentValue;
2074 }
2075 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2076 if (_location != _in_field) break; // only allow for fields
2077 return _jdk_internal_NullRestricted;
2078 }
2079 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2080 return _java_lang_Deprecated;
2081 }
2082 default: {
2083 break;
2084 }
2085 }
2086 return AnnotationCollector::_unknown;
2087 }
2088
2089 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2090 if (is_contended())
2091 // Setting the contended group also sets the contended bit in field flags
2092 f->set_contended_group(contended_group());
2093 if (is_stable())
2094 (f->field_flags_addr())->update_stable(true);
2095 }
2096
2097 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2098 // If there's an error deallocate metadata for field annotations
2099 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2100 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2101 }
2102
2103 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2104 if (has_annotation(_method_CallerSensitive))
2105 m->set_caller_sensitive();
2106 if (has_annotation(_method_ForceInline))
2107 m->set_force_inline();
2108 if (has_annotation(_method_DontInline))
2109 m->set_dont_inline();
2110 if (has_annotation(_method_ChangesCurrentThread))
2111 m->set_changes_current_thread();
2112 if (has_annotation(_method_JvmtiMountTransition))
2113 m->set_jvmti_mount_transition();
2114 if (has_annotation(_method_InjectedProfile))
2115 m->set_has_injected_profile();
2116 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2117 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2118 if (has_annotation(_method_Hidden))
2119 m->set_is_hidden();
2120 if (has_annotation(_method_Scoped))
2121 m->set_scoped();
2122 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2123 m->set_intrinsic_candidate();
2124 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2125 m->set_has_reserved_stack_access();
2126 if (has_annotation(_java_lang_Deprecated))
2127 m->set_deprecated();
2128 if (has_annotation(_java_lang_Deprecated_for_removal))
2129 m->set_deprecated_for_removal();
2130 }
2131
2132 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2133 assert(ik != nullptr, "invariant");
2134 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2135 ik->set_is_contended(is_contended());
2136 }
2137 if (has_annotation(_jdk_internal_ValueBased)) {
2138 ik->set_has_value_based_class_annotation();
2139 if (DiagnoseSyncOnValueBasedClasses) {
2140 ik->set_is_value_based();
2141 }
2142 }
2143 if (has_annotation(_java_lang_Deprecated)) {
2144 Array<Method*>* methods = ik->methods();
2145 int length = ik->methods()->length();
2146 for (int i = 0; i < length; i++) {
2147 Method* m = methods->at(i);
2148 m->set_deprecated();
2149 }
2150 }
2151 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2152 Array<Method*>* methods = ik->methods();
2153 int length = ik->methods()->length();
2154 for (int i = 0; i < length; i++) {
2155 Method* m = methods->at(i);
2156 m->set_deprecated_for_removal();
2157 }
2158 }
2159 }
2160
2161 #define MAX_ARGS_SIZE 255
2162 #define MAX_CODE_SIZE 65535
2163 #define INITIAL_MAX_LVT_NUMBER 256
2164
2165 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2166 *
2167 * Rules for LVT's and LVTT's are:
2168 * - There can be any number of LVT's and LVTT's.
2169 * - If there are n LVT's, it is the same as if there was just
2170 * one LVT containing all the entries from the n LVT's.
2171 * - There may be no more than one LVT entry per local variable.
2172 * Two LVT entries are 'equal' if these fields are the same:
2173 * start_pc, length, name, slot
2174 * - There may be no more than one LVTT entry per each LVT entry.
2175 * Each LVTT entry has to match some LVT entry.
2176 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2177 */
2178 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2179 int lvt_cnt,
2180 u2* const localvariable_table_length,
2181 const unsafe_u2** const localvariable_table_start,
2182 int lvtt_cnt,
2183 u2* const localvariable_type_table_length,
2184 const unsafe_u2** const localvariable_type_table_start,
2185 TRAPS) {
2186
2187 ResourceMark rm(THREAD);
2188
2189 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2190 256, AnyObj::RESOURCE_AREA, mtInternal,
2191 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2192
2193 LVT_HashTable* const table = new LVT_HashTable();
2194
2195 // To fill LocalVariableTable in
2196 const Classfile_LVT_Element* cf_lvt;
2197 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2198
2199 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2200 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2201 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2202 copy_lvt_element(&cf_lvt[idx], lvt);
2203 // If no duplicates, add LVT elem in hashtable.
2204 if (table->put(*lvt, lvt) == false
2205 && _need_verify
2206 && _major_version >= JAVA_1_5_VERSION) {
2207 classfile_parse_error("Duplicated LocalVariableTable attribute "
2208 "entry for '%s' in class file %s",
2209 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2210 THREAD);
2211 return;
2212 }
2213 }
2214 }
2215
2216 // To merge LocalVariableTable and LocalVariableTypeTable
2217 const Classfile_LVT_Element* cf_lvtt;
2218 LocalVariableTableElement lvtt_elem;
2219
2220 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2221 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2222 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2223 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2224 LocalVariableTableElement** entry = table->get(lvtt_elem);
2225 if (entry == nullptr) {
2226 if (_need_verify) {
2227 classfile_parse_error("LVTT entry for '%s' in class file %s "
2228 "does not match any LVT entry",
2229 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2230 THREAD);
2231 return;
2232 }
2233 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2234 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2235 "entry for '%s' in class file %s",
2236 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2237 THREAD);
2238 return;
2239 } else {
2240 // to add generic signatures into LocalVariableTable
2241 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2242 }
2243 }
2244 }
2245 }
2246
2247
2248 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2249 const u1* runtime_visible_annotations,
2250 int runtime_visible_annotations_length,
2251 const u1* runtime_invisible_annotations,
2252 int runtime_invisible_annotations_length,
2253 const u1* runtime_visible_parameter_annotations,
2254 int runtime_visible_parameter_annotations_length,
2255 const u1* runtime_invisible_parameter_annotations,
2256 int runtime_invisible_parameter_annotations_length,
2257 const u1* runtime_visible_type_annotations,
2258 int runtime_visible_type_annotations_length,
2259 const u1* runtime_invisible_type_annotations,
2260 int runtime_invisible_type_annotations_length,
2261 const u1* annotation_default,
2262 int annotation_default_length,
2263 TRAPS) {
2264
2265 AnnotationArray* a;
2266
2267 if (runtime_visible_annotations_length +
2268 runtime_invisible_annotations_length > 0) {
2269 a = assemble_annotations(runtime_visible_annotations,
2270 runtime_visible_annotations_length,
2271 runtime_invisible_annotations,
2272 runtime_invisible_annotations_length,
2273 CHECK);
2274 cm->set_method_annotations(a);
2275 }
2276
2277 if (runtime_visible_parameter_annotations_length +
2278 runtime_invisible_parameter_annotations_length > 0) {
2279 a = assemble_annotations(runtime_visible_parameter_annotations,
2280 runtime_visible_parameter_annotations_length,
2281 runtime_invisible_parameter_annotations,
2282 runtime_invisible_parameter_annotations_length,
2283 CHECK);
2284 cm->set_parameter_annotations(a);
2285 }
2286
2287 if (annotation_default_length > 0) {
2288 a = assemble_annotations(annotation_default,
2289 annotation_default_length,
2290 nullptr,
2291 0,
2292 CHECK);
2293 cm->set_default_annotations(a);
2294 }
2295
2296 if (runtime_visible_type_annotations_length +
2297 runtime_invisible_type_annotations_length > 0) {
2298 a = assemble_annotations(runtime_visible_type_annotations,
2299 runtime_visible_type_annotations_length,
2300 runtime_invisible_type_annotations,
2301 runtime_invisible_type_annotations_length,
2302 CHECK);
2303 cm->set_type_annotations(a);
2304 }
2305 }
2306
2307
2308 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2309 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2310 // Method* to save footprint, so we only know the size of the resulting Method* when the
2311 // entire method attribute is parsed.
2312 //
2313 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2314
2315 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2316 bool is_interface,
2317 bool is_value_class,
2318 bool is_abstract_class,
2319 const ConstantPool* cp,
2320 bool* const has_localvariable_table,
2321 TRAPS) {
2322 assert(cfs != nullptr, "invariant");
2323 assert(cp != nullptr, "invariant");
2324 assert(has_localvariable_table != nullptr, "invariant");
2325
2326 ResourceMark rm(THREAD);
2327 // Parse fixed parts:
2328 // access_flags, name_index, descriptor_index, attributes_count
2329 cfs->guarantee_more(8, CHECK_NULL);
2330
2331 int flags = cfs->get_u2_fast();
2332 const u2 name_index = cfs->get_u2_fast();
2333 const int cp_size = cp->length();
2334 check_property(
2335 valid_symbol_at(name_index),
2336 "Illegal constant pool index %u for method name in class file %s",
2337 name_index, CHECK_NULL);
2338 const Symbol* const name = cp->symbol_at(name_index);
2339 verify_legal_method_name(name, CHECK_NULL);
2340
2341 const u2 signature_index = cfs->get_u2_fast();
2342 guarantee_property(
2343 valid_symbol_at(signature_index),
2344 "Illegal constant pool index %u for method signature in class file %s",
2345 signature_index, CHECK_NULL);
2346 const Symbol* const signature = cp->symbol_at(signature_index);
2347
2348 if (name == vmSymbols::class_initializer_name()) {
2349 // We ignore the other access flags for a valid class initializer.
2350 // (JVM Spec 2nd ed., chapter 4.6)
2351 if (_major_version < 51) { // backward compatibility
2352 flags = JVM_ACC_STATIC;
2353 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2354 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2355 } else {
2356 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2357 return nullptr;
2358 }
2359 } else {
2360 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2361 }
2362
2363 if (name == vmSymbols::object_initializer_name() && is_interface) {
2364 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2365 return nullptr;
2366 }
2367
2368 if (EnableValhalla) {
2369 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2370 && ((flags & JVM_ACC_STATIC) == 0 )
2371 && !_access_flags.is_identity_class()) {
2372 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2373 return nullptr;
2374 }
2375 }
2376
2377 int args_size = -1; // only used when _need_verify is true
2378 if (_need_verify) {
2379 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2380 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2381 verify_legal_method_signature(name, signature, CHECK_NULL);
2382 if (args_size > MAX_ARGS_SIZE) {
2383 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2384 return nullptr;
2385 }
2386 }
2387
2388 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2389
2390 // Default values for code and exceptions attribute elements
2391 u2 max_stack = 0;
2392 u2 max_locals = 0;
2393 u4 code_length = 0;
2394 const u1* code_start = 0;
2395 u2 exception_table_length = 0;
2396 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2397 Array<int>* exception_handlers = Universe::the_empty_int_array();
2398 u2 checked_exceptions_length = 0;
2399 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2400 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2401 int linenumber_table_length = 0;
2402 int total_lvt_length = 0;
2403 u2 lvt_cnt = 0;
2404 u2 lvtt_cnt = 0;
2405 bool lvt_allocated = false;
2406 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2407 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2408 u2* localvariable_table_length = nullptr;
2409 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2410 u2* localvariable_type_table_length = nullptr;
2411 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2412 int method_parameters_length = -1;
2413 const u1* method_parameters_data = nullptr;
2414 bool method_parameters_seen = false;
2415 bool parsed_code_attribute = false;
2416 bool parsed_checked_exceptions_attribute = false;
2417 bool parsed_stackmap_attribute = false;
2418 // stackmap attribute - JDK1.5
2419 const u1* stackmap_data = nullptr;
2420 int stackmap_data_length = 0;
2421 u2 generic_signature_index = 0;
2422 MethodAnnotationCollector parsed_annotations;
2423 const u1* runtime_visible_annotations = nullptr;
2424 int runtime_visible_annotations_length = 0;
2425 const u1* runtime_invisible_annotations = nullptr;
2426 int runtime_invisible_annotations_length = 0;
2427 const u1* runtime_visible_parameter_annotations = nullptr;
2428 int runtime_visible_parameter_annotations_length = 0;
2429 const u1* runtime_invisible_parameter_annotations = nullptr;
2430 int runtime_invisible_parameter_annotations_length = 0;
2431 const u1* runtime_visible_type_annotations = nullptr;
2432 int runtime_visible_type_annotations_length = 0;
2433 const u1* runtime_invisible_type_annotations = nullptr;
2434 int runtime_invisible_type_annotations_length = 0;
2435 bool runtime_invisible_annotations_exists = false;
2436 bool runtime_invisible_type_annotations_exists = false;
2437 bool runtime_invisible_parameter_annotations_exists = false;
2438 const u1* annotation_default = nullptr;
2439 int annotation_default_length = 0;
2440
2441 // Parse code and exceptions attribute
2442 u2 method_attributes_count = cfs->get_u2_fast();
2443 while (method_attributes_count--) {
2444 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2445 const u2 method_attribute_name_index = cfs->get_u2_fast();
2446 const u4 method_attribute_length = cfs->get_u4_fast();
2447 check_property(
2448 valid_symbol_at(method_attribute_name_index),
2449 "Invalid method attribute name index %u in class file %s",
2450 method_attribute_name_index, CHECK_NULL);
2451
2452 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2453 if (method_attribute_name == vmSymbols::tag_code()) {
2454 // Parse Code attribute
2455 if (_need_verify) {
2456 guarantee_property(
2457 !access_flags.is_native() && !access_flags.is_abstract(),
2458 "Code attribute in native or abstract methods in class file %s",
2459 CHECK_NULL);
2460 }
2461 if (parsed_code_attribute) {
2462 classfile_parse_error("Multiple Code attributes in class file %s",
2463 THREAD);
2464 return nullptr;
2465 }
2466 parsed_code_attribute = true;
2467
2468 // Stack size, locals size, and code size
2469 cfs->guarantee_more(8, CHECK_NULL);
2470 max_stack = cfs->get_u2_fast();
2471 max_locals = cfs->get_u2_fast();
2472 code_length = cfs->get_u4_fast();
2473 if (_need_verify) {
2474 guarantee_property(args_size <= max_locals,
2475 "Arguments can't fit into locals in class file %s",
2476 CHECK_NULL);
2477 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2478 "Invalid method Code length %u in class file %s",
2479 code_length, CHECK_NULL);
2480 }
2481 // Code pointer
2482 code_start = cfs->current();
2483 assert(code_start != nullptr, "null code start");
2484 cfs->guarantee_more(code_length, CHECK_NULL);
2485 cfs->skip_u1_fast(code_length);
2486
2487 // Exception handler table
2488 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2489 exception_table_length = cfs->get_u2_fast();
2490 if (exception_table_length > 0) {
2491 exception_table_start = parse_exception_table(cfs,
2492 code_length,
2493 exception_table_length,
2494 CHECK_NULL);
2495 }
2496
2497 // Parse additional attributes in code attribute
2498 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2499 u2 code_attributes_count = cfs->get_u2_fast();
2500
2501 unsigned int calculated_attribute_length = 0;
2502
2503 calculated_attribute_length =
2504 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2505 calculated_attribute_length += checked_cast<unsigned int>(
2506 code_length +
2507 sizeof(exception_table_length) +
2508 sizeof(code_attributes_count) +
2509 exception_table_length *
2510 ( sizeof(u2) + // start_pc
2511 sizeof(u2) + // end_pc
2512 sizeof(u2) + // handler_pc
2513 sizeof(u2) )); // catch_type_index
2514
2515 while (code_attributes_count--) {
2516 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2517 const u2 code_attribute_name_index = cfs->get_u2_fast();
2518 const u4 code_attribute_length = cfs->get_u4_fast();
2519 calculated_attribute_length += code_attribute_length +
2520 (unsigned)sizeof(code_attribute_name_index) +
2521 (unsigned)sizeof(code_attribute_length);
2522 check_property(valid_symbol_at(code_attribute_name_index),
2523 "Invalid code attribute name index %u in class file %s",
2524 code_attribute_name_index,
2525 CHECK_NULL);
2526 if (LoadLineNumberTables &&
2527 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2528 // Parse and compress line number table
2529 parse_linenumber_table(code_attribute_length,
2530 code_length,
2531 &linenumber_table,
2532 CHECK_NULL);
2533
2534 } else if (LoadLocalVariableTables &&
2535 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2536 // Parse local variable table
2537 if (!lvt_allocated) {
2538 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2539 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2540 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2541 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2542 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2543 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2544 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2545 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2546 lvt_allocated = true;
2547 }
2548 if (lvt_cnt == max_lvt_cnt) {
2549 max_lvt_cnt <<= 1;
2550 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2551 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2552 }
2553 localvariable_table_start[lvt_cnt] =
2554 parse_localvariable_table(cfs,
2555 code_length,
2556 max_locals,
2557 code_attribute_length,
2558 &localvariable_table_length[lvt_cnt],
2559 false, // is not LVTT
2560 CHECK_NULL);
2561 total_lvt_length += localvariable_table_length[lvt_cnt];
2562 lvt_cnt++;
2563 } else if (LoadLocalVariableTypeTables &&
2564 _major_version >= JAVA_1_5_VERSION &&
2565 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2566 if (!lvt_allocated) {
2567 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2568 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2569 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2570 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2571 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2572 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2573 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2574 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2575 lvt_allocated = true;
2576 }
2577 // Parse local variable type table
2578 if (lvtt_cnt == max_lvtt_cnt) {
2579 max_lvtt_cnt <<= 1;
2580 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2581 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2582 }
2583 localvariable_type_table_start[lvtt_cnt] =
2584 parse_localvariable_table(cfs,
2585 code_length,
2586 max_locals,
2587 code_attribute_length,
2588 &localvariable_type_table_length[lvtt_cnt],
2589 true, // is LVTT
2590 CHECK_NULL);
2591 lvtt_cnt++;
2592 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2593 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2594 // Stack map is only needed by the new verifier in JDK1.5.
2595 if (parsed_stackmap_attribute) {
2596 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2597 return nullptr;
2598 }
2599 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2600 stackmap_data_length = code_attribute_length;
2601 parsed_stackmap_attribute = true;
2602 } else {
2603 // Skip unknown attributes
2604 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2605 }
2606 }
2607 // check method attribute length
2608 if (_need_verify) {
2609 guarantee_property(method_attribute_length == calculated_attribute_length,
2610 "Code segment has wrong length in class file %s",
2611 CHECK_NULL);
2612 }
2613 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2614 // Parse Exceptions attribute
2615 if (parsed_checked_exceptions_attribute) {
2616 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2617 THREAD);
2618 return nullptr;
2619 }
2620 parsed_checked_exceptions_attribute = true;
2621 checked_exceptions_start =
2622 parse_checked_exceptions(cfs,
2623 &checked_exceptions_length,
2624 method_attribute_length,
2625 CHECK_NULL);
2626 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2627 // reject multiple method parameters
2628 if (method_parameters_seen) {
2629 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2630 THREAD);
2631 return nullptr;
2632 }
2633 method_parameters_seen = true;
2634 method_parameters_length = cfs->get_u1_fast();
2635 const u4 real_length = (method_parameters_length * 4u) + 1u;
2636 if (method_attribute_length != real_length) {
2637 classfile_parse_error(
2638 "Invalid MethodParameters method attribute length %u in class file",
2639 method_attribute_length, THREAD);
2640 return nullptr;
2641 }
2642 method_parameters_data = cfs->current();
2643 cfs->skip_u2_fast(method_parameters_length);
2644 cfs->skip_u2_fast(method_parameters_length);
2645 // ignore this attribute if it cannot be reflected
2646 if (!vmClasses::Parameter_klass_loaded())
2647 method_parameters_length = -1;
2648 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2649 if (method_attribute_length != 0) {
2650 classfile_parse_error(
2651 "Invalid Synthetic method attribute length %u in class file %s",
2652 method_attribute_length, THREAD);
2653 return nullptr;
2654 }
2655 // Should we check that there hasn't already been a synthetic attribute?
2656 access_flags.set_is_synthetic();
2657 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2658 if (method_attribute_length != 0) {
2659 classfile_parse_error(
2660 "Invalid Deprecated method attribute length %u in class file %s",
2661 method_attribute_length, THREAD);
2662 return nullptr;
2663 }
2664 } else if (_major_version >= JAVA_1_5_VERSION) {
2665 if (method_attribute_name == vmSymbols::tag_signature()) {
2666 if (generic_signature_index != 0) {
2667 classfile_parse_error(
2668 "Multiple Signature attributes for method in class file %s",
2669 THREAD);
2670 return nullptr;
2671 }
2672 if (method_attribute_length != 2) {
2673 classfile_parse_error(
2674 "Invalid Signature attribute length %u in class file %s",
2675 method_attribute_length, THREAD);
2676 return nullptr;
2677 }
2678 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2679 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2680 if (runtime_visible_annotations != nullptr) {
2681 classfile_parse_error(
2682 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2683 THREAD);
2684 return nullptr;
2685 }
2686 runtime_visible_annotations_length = method_attribute_length;
2687 runtime_visible_annotations = cfs->current();
2688 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2689 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2690 parse_annotations(cp,
2691 runtime_visible_annotations,
2692 runtime_visible_annotations_length,
2693 &parsed_annotations,
2694 _loader_data,
2695 _can_access_vm_annotations);
2696 cfs->skip_u1_fast(runtime_visible_annotations_length);
2697 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2698 if (runtime_invisible_annotations_exists) {
2699 classfile_parse_error(
2700 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2701 THREAD);
2702 return nullptr;
2703 }
2704 runtime_invisible_annotations_exists = true;
2705 if (PreserveAllAnnotations) {
2706 runtime_invisible_annotations_length = method_attribute_length;
2707 runtime_invisible_annotations = cfs->current();
2708 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
2709 }
2710 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2711 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2712 if (runtime_visible_parameter_annotations != nullptr) {
2713 classfile_parse_error(
2714 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2715 THREAD);
2716 return nullptr;
2717 }
2718 runtime_visible_parameter_annotations_length = method_attribute_length;
2719 runtime_visible_parameter_annotations = cfs->current();
2720 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2721 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2722 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2723 if (runtime_invisible_parameter_annotations_exists) {
2724 classfile_parse_error(
2725 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2726 THREAD);
2727 return nullptr;
2728 }
2729 runtime_invisible_parameter_annotations_exists = true;
2730 if (PreserveAllAnnotations) {
2731 runtime_invisible_parameter_annotations_length = method_attribute_length;
2732 runtime_invisible_parameter_annotations = cfs->current();
2733 assert(runtime_invisible_parameter_annotations != nullptr,
2734 "null invisible parameter annotations");
2735 }
2736 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2737 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2738 if (annotation_default != nullptr) {
2739 classfile_parse_error(
2740 "Multiple AnnotationDefault attributes for method in class file %s",
2741 THREAD);
2742 return nullptr;
2743 }
2744 annotation_default_length = method_attribute_length;
2745 annotation_default = cfs->current();
2746 assert(annotation_default != nullptr, "null annotation default");
2747 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2748 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2749 if (runtime_visible_type_annotations != nullptr) {
2750 classfile_parse_error(
2751 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2752 THREAD);
2753 return nullptr;
2754 }
2755 runtime_visible_type_annotations_length = method_attribute_length;
2756 runtime_visible_type_annotations = cfs->current();
2757 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2758 // No need for the VM to parse Type annotations
2759 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2760 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2761 if (runtime_invisible_type_annotations_exists) {
2762 classfile_parse_error(
2763 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2764 THREAD);
2765 return nullptr;
2766 } else {
2767 runtime_invisible_type_annotations_exists = true;
2768 }
2769 if (PreserveAllAnnotations) {
2770 runtime_invisible_type_annotations_length = method_attribute_length;
2771 runtime_invisible_type_annotations = cfs->current();
2772 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
2773 }
2774 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2775 } else {
2776 // Skip unknown attributes
2777 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2778 }
2779 } else {
2780 // Skip unknown attributes
2781 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2782 }
2783 }
2784
2785 if (linenumber_table != nullptr) {
2786 linenumber_table->write_terminator();
2787 linenumber_table_length = linenumber_table->position();
2788 }
2789
2790 // Make sure there's at least one Code attribute in non-native/non-abstract method
2791 if (_need_verify) {
2792 guarantee_property(access_flags.is_native() ||
2793 access_flags.is_abstract() ||
2794 parsed_code_attribute,
2795 "Absent Code attribute in method that is not native or abstract in class file %s",
2796 CHECK_NULL);
2797 }
2798
2799 // All sizing information for a Method* is finally available, now create it
2800 InlineTableSizes sizes(
2801 total_lvt_length,
2802 linenumber_table_length,
2803 exception_table_length,
2804 checked_exceptions_length,
2805 method_parameters_length,
2806 generic_signature_index,
2807 runtime_visible_annotations_length +
2808 runtime_invisible_annotations_length,
2809 runtime_visible_parameter_annotations_length +
2810 runtime_invisible_parameter_annotations_length,
2811 runtime_visible_type_annotations_length +
2812 runtime_invisible_type_annotations_length,
2813 annotation_default_length,
2814 0);
2815
2816 Method* const m = Method::allocate(_loader_data,
2817 code_length,
2818 access_flags,
2819 &sizes,
2820 ConstMethod::NORMAL,
2821 _cp->symbol_at(name_index),
2822 CHECK_NULL);
2823
2824 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2825
2826 // Fill in information from fixed part (access_flags already set)
2827 m->set_constants(_cp);
2828 m->set_name_index(name_index);
2829 m->set_signature_index(signature_index);
2830 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2831 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2832
2833 // Fill in code attribute information
2834 m->set_max_stack(max_stack);
2835 m->set_max_locals(max_locals);
2836 if (stackmap_data != nullptr) {
2837 m->constMethod()->copy_stackmap_data(_loader_data,
2838 (u1*)stackmap_data,
2839 stackmap_data_length,
2840 CHECK_NULL);
2841 }
2842
2843 // Copy byte codes
2844 m->set_code((u1*)code_start);
2845
2846 // Copy line number table
2847 if (linenumber_table != nullptr) {
2848 memcpy(m->compressed_linenumber_table(),
2849 linenumber_table->buffer(),
2850 linenumber_table_length);
2851 }
2852
2853 // Copy exception table
2854 if (exception_table_length > 0) {
2855 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2856 m->exception_table_start(),
2857 exception_table_length * sizeof(ExceptionTableElement),
2858 sizeof(u2));
2859 }
2860
2861 // Copy method parameters
2862 if (method_parameters_length > 0) {
2863 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2864 for (int i = 0; i < method_parameters_length; i++) {
2865 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2866 method_parameters_data += 2;
2867 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2868 method_parameters_data += 2;
2869 }
2870 }
2871
2872 // Copy checked exceptions
2873 if (checked_exceptions_length > 0) {
2874 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2875 m->checked_exceptions_start(),
2876 checked_exceptions_length * sizeof(CheckedExceptionElement),
2877 sizeof(u2));
2878 }
2879
2880 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2881 if (total_lvt_length > 0) {
2882 *has_localvariable_table = true;
2883 copy_localvariable_table(m->constMethod(),
2884 lvt_cnt,
2885 localvariable_table_length,
2886 localvariable_table_start,
2887 lvtt_cnt,
2888 localvariable_type_table_length,
2889 localvariable_type_table_start,
2890 CHECK_NULL);
2891 }
2892
2893 if (parsed_annotations.has_any_annotations())
2894 parsed_annotations.apply_to(methodHandle(THREAD, m));
2895
2896 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2897 m->set_is_hidden();
2898 }
2899
2900 // Copy annotations
2901 copy_method_annotations(m->constMethod(),
2902 runtime_visible_annotations,
2903 runtime_visible_annotations_length,
2904 runtime_invisible_annotations,
2905 runtime_invisible_annotations_length,
2906 runtime_visible_parameter_annotations,
2907 runtime_visible_parameter_annotations_length,
2908 runtime_invisible_parameter_annotations,
2909 runtime_invisible_parameter_annotations_length,
2910 runtime_visible_type_annotations,
2911 runtime_visible_type_annotations_length,
2912 runtime_invisible_type_annotations,
2913 runtime_invisible_type_annotations_length,
2914 annotation_default,
2915 annotation_default_length,
2916 CHECK_NULL);
2917
2918 if (InstanceKlass::is_finalization_enabled() &&
2919 name == vmSymbols::finalize_method_name() &&
2920 signature == vmSymbols::void_method_signature()) {
2921 if (m->is_empty_method()) {
2922 _has_empty_finalizer = true;
2923 } else {
2924 _has_finalizer = true;
2925 }
2926 }
2927 if (name == vmSymbols::object_initializer_name() &&
2928 signature == vmSymbols::void_method_signature() &&
2929 m->is_vanilla_constructor()) {
2930 _has_vanilla_constructor = true;
2931 }
2932
2933 NOT_PRODUCT(m->verify());
2934 return m;
2935 }
2936
2937
2938 // Side-effects: populates the _methods field in the parser
2939 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2940 bool is_interface,
2941 bool is_value_class,
2942 bool is_abstract_type,
2943 bool* const has_localvariable_table,
2944 bool* has_final_method,
2945 bool* declares_nonstatic_concrete_methods,
2946 TRAPS) {
2947 assert(cfs != nullptr, "invariant");
2948 assert(has_localvariable_table != nullptr, "invariant");
2949 assert(has_final_method != nullptr, "invariant");
2950 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2951
2952 assert(nullptr == _methods, "invariant");
2953
2954 cfs->guarantee_more(2, CHECK); // length
2955 const u2 length = cfs->get_u2_fast();
2956 if (length == 0) {
2957 _methods = Universe::the_empty_method_array();
2958 } else {
2959 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2960 length,
2961 nullptr,
2962 CHECK);
2963
2964 for (int index = 0; index < length; index++) {
2965 Method* method = parse_method(cfs,
2966 is_interface,
2967 is_value_class,
2968 is_abstract_type,
2969 _cp,
2970 has_localvariable_table,
2971 CHECK);
2972
2973 if (method->is_final()) {
2974 *has_final_method = true;
2975 }
2976 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2977 // used for interface initialization, and default method inheritance analysis
2978 if (is_interface && !(*declares_nonstatic_concrete_methods)
2979 && !method->is_abstract() && !method->is_static()) {
2980 *declares_nonstatic_concrete_methods = true;
2981 }
2982 _methods->at_put(index, method);
2983 }
2984
2985 if (_need_verify && length > 1) {
2986 // Check duplicated methods
2987 ResourceMark rm(THREAD);
2988 // Set containing name-signature pairs
2989 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2990 for (int i = 0; i < length; i++) {
2991 const Method* const m = _methods->at(i);
2992 NameSigHash name_and_sig(m->name(), m->signature());
2993 // If no duplicates, add name/signature in hashtable names_and_sigs.
2994 if(!names_and_sigs->put(name_and_sig, 0)) {
2995 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2996 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2997 return;
2998 }
2999 }
3000 }
3001 }
3002 }
3003
3004 static const intArray* sort_methods(Array<Method*>* methods) {
3005 const int length = methods->length();
3006 // If JVMTI original method ordering or sharing is enabled we have to
3007 // remember the original class file ordering.
3008 // We temporarily use the vtable_index field in the Method* to store the
3009 // class file index, so we can read in after calling qsort.
3010 // Put the method ordering in the shared archive.
3011 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
3012 for (int index = 0; index < length; index++) {
3013 Method* const m = methods->at(index);
3014 assert(!m->valid_vtable_index(), "vtable index should not be set");
3015 m->set_vtable_index(index);
3016 }
3017 }
3018 // Sort method array by ascending method name (for faster lookups & vtable construction)
3019 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3020 Method::sort_methods(methods);
3021
3022 intArray* method_ordering = nullptr;
3023 // If JVMTI original method ordering or sharing is enabled construct int
3024 // array remembering the original ordering
3025 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
3026 method_ordering = new intArray(length, length, -1);
3027 for (int index = 0; index < length; index++) {
3028 Method* const m = methods->at(index);
3029 const int old_index = m->vtable_index();
3030 assert(old_index >= 0 && old_index < length, "invalid method index");
3031 method_ordering->at_put(index, old_index);
3032 m->set_vtable_index(Method::invalid_vtable_index);
3033 }
3034 }
3035 return method_ordering;
3036 }
3037
3038 // Parse generic_signature attribute for methods and fields
3039 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3040 TRAPS) {
3041 assert(cfs != nullptr, "invariant");
3042
3043 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3044 const u2 generic_signature_index = cfs->get_u2_fast();
3045 check_property(
3046 valid_symbol_at(generic_signature_index),
3047 "Invalid Signature attribute at constant pool index %u in class file %s",
3048 generic_signature_index, CHECK_0);
3049 return generic_signature_index;
3050 }
3051
3052 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3053 TRAPS) {
3054
3055 assert(cfs != nullptr, "invariant");
3056
3057 cfs->guarantee_more(2, CHECK); // sourcefile_index
3058 const u2 sourcefile_index = cfs->get_u2_fast();
3059 check_property(
3060 valid_symbol_at(sourcefile_index),
3061 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3062 sourcefile_index, CHECK);
3063 set_class_sourcefile_index(sourcefile_index);
3064 }
3065
3066 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3067 int length,
3068 TRAPS) {
3069 assert(cfs != nullptr, "invariant");
3070
3071 const u1* const sde_buffer = cfs->current();
3072 assert(sde_buffer != nullptr, "null sde buffer");
3073
3074 // Don't bother storing it if there is no way to retrieve it
3075 if (JvmtiExport::can_get_source_debug_extension()) {
3076 assert((length+1) > length, "Overflow checking");
3077 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3078 for (int i = 0; i < length; i++) {
3079 sde[i] = sde_buffer[i];
3080 }
3081 sde[length] = '\0';
3082 set_class_sde_buffer((const char*)sde, length);
3083 }
3084 // Got utf8 string, set stream position forward
3085 cfs->skip_u1(length, CHECK);
3086 }
3087
3088
3089 // Inner classes can be static, private or protected (classic VM does this)
3090 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3091 JVM_ACC_PRIVATE | \
3092 JVM_ACC_PROTECTED | \
3093 JVM_ACC_STATIC \
3094 )
3095
3096 // Find index of the InnerClasses entry for the specified inner_class_info_index.
3097 // Return -1 if none is found.
3098 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3099 Symbol* cp_klass_name = cp->klass_name_at(inner);
3100 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3101 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3102 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3103 return idx;
3104 }
3105 }
3106 return -1;
3107 }
3108
3109 // Return the outer_class_info_index for the InnerClasses entry containing the
3110 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
3111 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3112 if (inner == 0) return -1;
3113 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3114 if (idx == -1) return -1;
3115 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3116 return result;
3117 }
3118
3119 // Return true if circularity is found, false if no circularity is found.
3120 // Use Floyd's cycle finding algorithm.
3121 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3122 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3123 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3124
3125 while (fast != -1 && fast != 0) {
3126 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3127 return true; // found a circularity
3128 }
3129 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3130 if (fast == -1) return false;
3131 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3132 if (fast == -1) return false;
3133 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3134 assert(slow != -1, "sanity check");
3135 }
3136 return false;
3137 }
3138
3139 // Loop through each InnerClasses entry checking for circularities and duplications
3140 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3141 // return true if a circularity or entries with duplicate inner_class_info_indexes
3142 // are found.
3143 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3144 // Loop through each InnerClasses entry.
3145 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3146 // Return true if there are circular entries.
3147 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3148 return true;
3149 }
3150 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3151 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3152 y += InstanceKlass::inner_class_next_offset) {
3153
3154 // 4347400: make sure there's no duplicate entry in the classes array
3155 if (_major_version >= JAVA_1_5_VERSION) {
3156 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3157 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3158 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3159 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3160 "Duplicate entry in InnerClasses attribute in class file %s",
3161 CHECK_(true));
3162 }
3163 // Return true if there are two entries with the same inner_class_info_index.
3164 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3165 return true;
3166 }
3167 }
3168 }
3169 return false;
3170 }
3171
3172 // Return number of classes in the inner classes attribute table
3173 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3174 const ConstantPool* cp,
3175 const u1* const inner_classes_attribute_start,
3176 bool parsed_enclosingmethod_attribute,
3177 u2 enclosing_method_class_index,
3178 u2 enclosing_method_method_index,
3179 TRAPS) {
3180 const u1* const current_mark = cfs->current();
3181 u2 length = 0;
3182 if (inner_classes_attribute_start != nullptr) {
3183 cfs->set_current(inner_classes_attribute_start);
3184 cfs->guarantee_more(2, CHECK_0); // length
3185 length = cfs->get_u2_fast();
3186 }
3187
3188 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3189 // method data:
3190 // [inner_class_info_index,
3191 // outer_class_info_index,
3192 // inner_name_index,
3193 // inner_class_access_flags,
3194 // ...
3195 // enclosing_method_class_index,
3196 // enclosing_method_method_index]
3197 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3198 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3199 _inner_classes = inner_classes;
3200
3201 int index = 0;
3202 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3203 for (int n = 0; n < length; n++) {
3204 // Inner class index
3205 const u2 inner_class_info_index = cfs->get_u2_fast();
3206 check_property(
3207 valid_klass_reference_at(inner_class_info_index),
3208 "inner_class_info_index %u has bad constant type in class file %s",
3209 inner_class_info_index, CHECK_0);
3210 // Outer class index
3211 const u2 outer_class_info_index = cfs->get_u2_fast();
3212 check_property(
3213 outer_class_info_index == 0 ||
3214 valid_klass_reference_at(outer_class_info_index),
3215 "outer_class_info_index %u has bad constant type in class file %s",
3216 outer_class_info_index, CHECK_0);
3217
3218 if (outer_class_info_index != 0) {
3219 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3220 char* bytes = (char*)outer_class_name->bytes();
3221 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3222 "Outer class is an array class in class file %s", CHECK_0);
3223 }
3224 // Inner class name
3225 const u2 inner_name_index = cfs->get_u2_fast();
3226 check_property(
3227 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3228 "inner_name_index %u has bad constant type in class file %s",
3229 inner_name_index, CHECK_0);
3230 if (_need_verify) {
3231 guarantee_property(inner_class_info_index != outer_class_info_index,
3232 "Class is both outer and inner class in class file %s", CHECK_0);
3233 }
3234
3235 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3236 // JVM_ACC_MODULE is defined in JDK-9 and later.
3237 if (_major_version >= JAVA_9_VERSION) {
3238 recognized_modifiers |= JVM_ACC_MODULE;
3239 }
3240
3241 // Access flags
3242 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3243
3244 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3245 // Set abstract bit for old class files for backward compatibility
3246 flags |= JVM_ACC_ABSTRACT;
3247 }
3248
3249 if (!supports_inline_types()) {
3250 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3251 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3252 if (!is_module && !is_interface) {
3253 flags |= JVM_ACC_IDENTITY;
3254 }
3255 }
3256
3257 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3258 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3259 AccessFlags inner_access_flags(flags);
3260
3261 inner_classes->at_put(index++, inner_class_info_index);
3262 inner_classes->at_put(index++, outer_class_info_index);
3263 inner_classes->at_put(index++, inner_name_index);
3264 inner_classes->at_put(index++, inner_access_flags.as_short());
3265 }
3266
3267 // Check for circular and duplicate entries.
3268 bool has_circularity = false;
3269 if (_need_verify) {
3270 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3271 if (has_circularity) {
3272 // If circularity check failed then ignore InnerClasses attribute.
3273 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3274 index = 0;
3275 if (parsed_enclosingmethod_attribute) {
3276 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3277 _inner_classes = inner_classes;
3278 } else {
3279 _inner_classes = Universe::the_empty_short_array();
3280 }
3281 }
3282 }
3283 // Set EnclosingMethod class and method indexes.
3284 if (parsed_enclosingmethod_attribute) {
3285 inner_classes->at_put(index++, enclosing_method_class_index);
3286 inner_classes->at_put(index++, enclosing_method_method_index);
3287 }
3288 assert(index == size || has_circularity, "wrong size");
3289
3290 // Restore buffer's current position.
3291 cfs->set_current(current_mark);
3292
3293 return length;
3294 }
3295
3296 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3297 const u1* const nest_members_attribute_start,
3298 TRAPS) {
3299 const u1* const current_mark = cfs->current();
3300 u2 length = 0;
3301 if (nest_members_attribute_start != nullptr) {
3302 cfs->set_current(nest_members_attribute_start);
3303 cfs->guarantee_more(2, CHECK_0); // length
3304 length = cfs->get_u2_fast();
3305 }
3306 const int size = length;
3307 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3308 _nest_members = nest_members;
3309
3310 int index = 0;
3311 cfs->guarantee_more(2 * length, CHECK_0);
3312 for (int n = 0; n < length; n++) {
3313 const u2 class_info_index = cfs->get_u2_fast();
3314 check_property(
3315 valid_klass_reference_at(class_info_index),
3316 "Nest member class_info_index %u has bad constant type in class file %s",
3317 class_info_index, CHECK_0);
3318 nest_members->at_put(index++, class_info_index);
3319 }
3320 assert(index == size, "wrong size");
3321
3322 // Restore buffer's current position.
3323 cfs->set_current(current_mark);
3324
3325 return length;
3326 }
3327
3328 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3329 const u1* const permitted_subclasses_attribute_start,
3330 TRAPS) {
3331 const u1* const current_mark = cfs->current();
3332 u2 length = 0;
3333 if (permitted_subclasses_attribute_start != nullptr) {
3334 cfs->set_current(permitted_subclasses_attribute_start);
3335 cfs->guarantee_more(2, CHECK_0); // length
3336 length = cfs->get_u2_fast();
3337 }
3338 const int size = length;
3339 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3340 _permitted_subclasses = permitted_subclasses;
3341
3342 if (length > 0) {
3343 int index = 0;
3344 cfs->guarantee_more(2 * length, CHECK_0);
3345 for (int n = 0; n < length; n++) {
3346 const u2 class_info_index = cfs->get_u2_fast();
3347 check_property(
3348 valid_klass_reference_at(class_info_index),
3349 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3350 class_info_index, CHECK_0);
3351 permitted_subclasses->at_put(index++, class_info_index);
3352 }
3353 assert(index == size, "wrong size");
3354 }
3355
3356 // Restore buffer's current position.
3357 cfs->set_current(current_mark);
3358
3359 return length;
3360 }
3361
3362 u2 ClassFileParser::parse_classfile_preload_attribute(const ClassFileStream* const cfs,
3363 const u1* const preload_attribute_start,
3364 TRAPS) {
3365 const u1* const current_mark = cfs->current();
3366 u2 length = 0;
3367 if (preload_attribute_start != nullptr) {
3368 cfs->set_current(preload_attribute_start);
3369 cfs->guarantee_more(2, CHECK_0); // length
3370 length = cfs->get_u2_fast();
3371 }
3372 const int size = length;
3373 Array<u2>* const preload_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3374 _preload_classes = preload_classes;
3375 if (length > 0) {
3376 int index = 0;
3377 cfs->guarantee_more(2 * length, CHECK_0);
3378 for (int n = 0; n < length; n++) {
3379 const u2 class_info_index = cfs->get_u2_fast();
3380 check_property(
3381 valid_klass_reference_at(class_info_index),
3382 "Preload class_info_index %u has bad constant type in class file %s",
3383 class_info_index, CHECK_0);
3384 preload_classes->at_put(index++, class_info_index);
3385 }
3386 assert(index == size, "wrong size");
3387 }
3388
3389 // Restore buffer's current position.
3390 cfs->set_current(current_mark);
3391
3392 return length;
3393 }
3394
3395 // Record {
3396 // u2 attribute_name_index;
3397 // u4 attribute_length;
3398 // u2 components_count;
3399 // component_info components[components_count];
3400 // }
3401 // component_info {
3402 // u2 name_index;
3403 // u2 descriptor_index
3404 // u2 attributes_count;
3405 // attribute_info_attributes[attributes_count];
3406 // }
3407 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3408 const ConstantPool* cp,
3409 const u1* const record_attribute_start,
3410 TRAPS) {
3411 const u1* const current_mark = cfs->current();
3412 int components_count = 0;
3413 unsigned int calculate_attr_size = 0;
3414 if (record_attribute_start != nullptr) {
3415 cfs->set_current(record_attribute_start);
3416 cfs->guarantee_more(2, CHECK_0); // num of components
3417 components_count = (int)cfs->get_u2_fast();
3418 calculate_attr_size = 2;
3419 }
3420
3421 Array<RecordComponent*>* const record_components =
3422 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3423 _record_components = record_components;
3424
3425 for (int x = 0; x < components_count; x++) {
3426 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3427
3428 const u2 name_index = cfs->get_u2_fast();
3429 check_property(valid_symbol_at(name_index),
3430 "Invalid constant pool index %u for name in Record attribute in class file %s",
3431 name_index, CHECK_0);
3432 const Symbol* const name = cp->symbol_at(name_index);
3433 verify_legal_field_name(name, CHECK_0);
3434
3435 const u2 descriptor_index = cfs->get_u2_fast();
3436 check_property(valid_symbol_at(descriptor_index),
3437 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3438 descriptor_index, CHECK_0);
3439 const Symbol* const descr = cp->symbol_at(descriptor_index);
3440 verify_legal_field_signature(name, descr, CHECK_0);
3441
3442 const u2 attributes_count = cfs->get_u2_fast();
3443 calculate_attr_size += 6;
3444 u2 generic_sig_index = 0;
3445 const u1* runtime_visible_annotations = nullptr;
3446 int runtime_visible_annotations_length = 0;
3447 const u1* runtime_invisible_annotations = nullptr;
3448 int runtime_invisible_annotations_length = 0;
3449 bool runtime_invisible_annotations_exists = false;
3450 const u1* runtime_visible_type_annotations = nullptr;
3451 int runtime_visible_type_annotations_length = 0;
3452 const u1* runtime_invisible_type_annotations = nullptr;
3453 int runtime_invisible_type_annotations_length = 0;
3454 bool runtime_invisible_type_annotations_exists = false;
3455
3456 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3457 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3458 for (int y = 0; y < attributes_count; y++) {
3459 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3460 const u2 attribute_name_index = cfs->get_u2_fast();
3461 const u4 attribute_length = cfs->get_u4_fast();
3462 calculate_attr_size += 6;
3463 check_property(
3464 valid_symbol_at(attribute_name_index),
3465 "Invalid Record attribute name index %u in class file %s",
3466 attribute_name_index, CHECK_0);
3467
3468 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3469 if (attribute_name == vmSymbols::tag_signature()) {
3470 if (generic_sig_index != 0) {
3471 classfile_parse_error(
3472 "Multiple Signature attributes for Record component in class file %s",
3473 THREAD);
3474 return 0;
3475 }
3476 if (attribute_length != 2) {
3477 classfile_parse_error(
3478 "Invalid Signature attribute length %u in Record component in class file %s",
3479 attribute_length, THREAD);
3480 return 0;
3481 }
3482 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3483
3484 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3485 if (runtime_visible_annotations != nullptr) {
3486 classfile_parse_error(
3487 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3488 return 0;
3489 }
3490 runtime_visible_annotations_length = attribute_length;
3491 runtime_visible_annotations = cfs->current();
3492
3493 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3494 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3495 cfs->skip_u1_fast(runtime_visible_annotations_length);
3496
3497 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3498 if (runtime_invisible_annotations_exists) {
3499 classfile_parse_error(
3500 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3501 return 0;
3502 }
3503 runtime_invisible_annotations_exists = true;
3504 if (PreserveAllAnnotations) {
3505 runtime_invisible_annotations_length = attribute_length;
3506 runtime_invisible_annotations = cfs->current();
3507 assert(runtime_invisible_annotations != nullptr, "null record component invisible annotation");
3508 }
3509 cfs->skip_u1(attribute_length, CHECK_0);
3510
3511 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3512 if (runtime_visible_type_annotations != nullptr) {
3513 classfile_parse_error(
3514 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3515 return 0;
3516 }
3517 runtime_visible_type_annotations_length = attribute_length;
3518 runtime_visible_type_annotations = cfs->current();
3519
3520 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3521 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3522 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3523
3524 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3525 if (runtime_invisible_type_annotations_exists) {
3526 classfile_parse_error(
3527 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3528 return 0;
3529 }
3530 runtime_invisible_type_annotations_exists = true;
3531 if (PreserveAllAnnotations) {
3532 runtime_invisible_type_annotations_length = attribute_length;
3533 runtime_invisible_type_annotations = cfs->current();
3534 assert(runtime_invisible_type_annotations != nullptr, "null record component invisible type annotation");
3535 }
3536 cfs->skip_u1(attribute_length, CHECK_0);
3537
3538 } else {
3539 // Skip unknown attributes
3540 cfs->skip_u1(attribute_length, CHECK_0);
3541 }
3542 calculate_attr_size += attribute_length;
3543 } // End of attributes For loop
3544
3545 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3546 runtime_visible_annotations_length,
3547 runtime_invisible_annotations,
3548 runtime_invisible_annotations_length,
3549 CHECK_0);
3550 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3551 runtime_visible_type_annotations_length,
3552 runtime_invisible_type_annotations,
3553 runtime_invisible_type_annotations_length,
3554 CHECK_0);
3555
3556 RecordComponent* record_component =
3557 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3558 attributes_count, generic_sig_index,
3559 annotations, type_annotations, CHECK_0);
3560 record_components->at_put(x, record_component);
3561 } // End of component processing loop
3562
3563 // Restore buffer's current position.
3564 cfs->set_current(current_mark);
3565 return calculate_attr_size;
3566 }
3567
3568 void ClassFileParser::parse_classfile_synthetic_attribute() {
3569 set_class_synthetic_flag(true);
3570 }
3571
3572 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3573 assert(cfs != nullptr, "invariant");
3574
3575 const u2 signature_index = cfs->get_u2(CHECK);
3576 check_property(
3577 valid_symbol_at(signature_index),
3578 "Invalid constant pool index %u in Signature attribute in class file %s",
3579 signature_index, CHECK);
3580 set_class_generic_signature_index(signature_index);
3581 }
3582
3583 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3584 ConstantPool* cp,
3585 u4 attribute_byte_length,
3586 TRAPS) {
3587 assert(cfs != nullptr, "invariant");
3588 assert(cp != nullptr, "invariant");
3589
3590 const u1* const current_start = cfs->current();
3591
3592 guarantee_property(attribute_byte_length >= sizeof(u2),
3593 "Invalid BootstrapMethods attribute length %u in class file %s",
3594 attribute_byte_length,
3595 CHECK);
3596
3597 cfs->guarantee_more(attribute_byte_length, CHECK);
3598
3599 const int attribute_array_length = cfs->get_u2_fast();
3600
3601 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3602 "Short length on BootstrapMethods in class file %s",
3603 CHECK);
3604
3605
3606 // The attribute contains a counted array of counted tuples of shorts,
3607 // represending bootstrap specifiers:
3608 // length*{bootstrap_method_index, argument_count*{argument_index}}
3609 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3610 // operand_count = number of shorts in attr, except for leading length
3611
3612 // The attribute is copied into a short[] array.
3613 // The array begins with a series of short[2] pairs, one for each tuple.
3614 const int index_size = (attribute_array_length * 2);
3615
3616 Array<u2>* const operands =
3617 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3618
3619 // Eagerly assign operands so they will be deallocated with the constant
3620 // pool if there is an error.
3621 cp->set_operands(operands);
3622
3623 int operand_fill_index = index_size;
3624 const int cp_size = cp->length();
3625
3626 for (int n = 0; n < attribute_array_length; n++) {
3627 // Store a 32-bit offset into the header of the operand array.
3628 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3629
3630 // Read a bootstrap specifier.
3631 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3632 const u2 bootstrap_method_index = cfs->get_u2_fast();
3633 const u2 argument_count = cfs->get_u2_fast();
3634 check_property(
3635 valid_cp_range(bootstrap_method_index, cp_size) &&
3636 cp->tag_at(bootstrap_method_index).is_method_handle(),
3637 "bootstrap_method_index %u has bad constant type in class file %s",
3638 bootstrap_method_index,
3639 CHECK);
3640
3641 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3642 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3643 CHECK);
3644
3645 operands->at_put(operand_fill_index++, bootstrap_method_index);
3646 operands->at_put(operand_fill_index++, argument_count);
3647
3648 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3649 for (int j = 0; j < argument_count; j++) {
3650 const u2 argument_index = cfs->get_u2_fast();
3651 check_property(
3652 valid_cp_range(argument_index, cp_size) &&
3653 cp->tag_at(argument_index).is_loadable_constant(),
3654 "argument_index %u has bad constant type in class file %s",
3655 argument_index,
3656 CHECK);
3657 operands->at_put(operand_fill_index++, argument_index);
3658 }
3659 }
3660 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3661 "Bad length on BootstrapMethods in class file %s",
3662 CHECK);
3663 }
3664
3665 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3666 ConstantPool* cp,
3667 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3668 TRAPS) {
3669 assert(cfs != nullptr, "invariant");
3670 assert(cp != nullptr, "invariant");
3671 assert(parsed_annotations != nullptr, "invariant");
3672
3673 // Set inner classes attribute to default sentinel
3674 _inner_classes = Universe::the_empty_short_array();
3675 // Set nest members attribute to default sentinel
3676 _nest_members = Universe::the_empty_short_array();
3677 // Set _permitted_subclasses attribute to default sentinel
3678 _permitted_subclasses = Universe::the_empty_short_array();
3679 // Set _preload_classes attribute to default sentinel
3680 _preload_classes = Universe::the_empty_short_array();
3681 cfs->guarantee_more(2, CHECK); // attributes_count
3682 u2 attributes_count = cfs->get_u2_fast();
3683 bool parsed_sourcefile_attribute = false;
3684 bool parsed_innerclasses_attribute = false;
3685 bool parsed_nest_members_attribute = false;
3686 bool parsed_permitted_subclasses_attribute = false;
3687 bool parsed_preload_attribute = false;
3688 bool parsed_nest_host_attribute = false;
3689 bool parsed_record_attribute = false;
3690 bool parsed_enclosingmethod_attribute = false;
3691 bool parsed_bootstrap_methods_attribute = false;
3692 const u1* runtime_visible_annotations = nullptr;
3693 int runtime_visible_annotations_length = 0;
3694 const u1* runtime_invisible_annotations = nullptr;
3695 int runtime_invisible_annotations_length = 0;
3696 const u1* runtime_visible_type_annotations = nullptr;
3697 int runtime_visible_type_annotations_length = 0;
3698 const u1* runtime_invisible_type_annotations = nullptr;
3699 int runtime_invisible_type_annotations_length = 0;
3700 bool runtime_invisible_type_annotations_exists = false;
3701 bool runtime_invisible_annotations_exists = false;
3702 bool parsed_source_debug_ext_annotations_exist = false;
3703 const u1* inner_classes_attribute_start = nullptr;
3704 u4 inner_classes_attribute_length = 0;
3705 u2 enclosing_method_class_index = 0;
3706 u2 enclosing_method_method_index = 0;
3707 const u1* nest_members_attribute_start = nullptr;
3708 u4 nest_members_attribute_length = 0;
3709 const u1* record_attribute_start = nullptr;
3710 u4 record_attribute_length = 0;
3711 const u1* permitted_subclasses_attribute_start = nullptr;
3712 u4 permitted_subclasses_attribute_length = 0;
3713 const u1* preload_attribute_start = nullptr;
3714 u4 preload_attribute_length = 0;
3715
3716 // Iterate over attributes
3717 while (attributes_count--) {
3718 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3719 const u2 attribute_name_index = cfs->get_u2_fast();
3720 const u4 attribute_length = cfs->get_u4_fast();
3721 check_property(
3722 valid_symbol_at(attribute_name_index),
3723 "Attribute name has bad constant pool index %u in class file %s",
3724 attribute_name_index, CHECK);
3725 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3726 if (tag == vmSymbols::tag_source_file()) {
3727 // Check for SourceFile tag
3728 if (_need_verify) {
3729 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3730 }
3731 if (parsed_sourcefile_attribute) {
3732 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3733 return;
3734 } else {
3735 parsed_sourcefile_attribute = true;
3736 }
3737 parse_classfile_sourcefile_attribute(cfs, CHECK);
3738 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3739 // Check for SourceDebugExtension tag
3740 if (parsed_source_debug_ext_annotations_exist) {
3741 classfile_parse_error(
3742 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3743 return;
3744 }
3745 parsed_source_debug_ext_annotations_exist = true;
3746 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3747 } else if (tag == vmSymbols::tag_inner_classes()) {
3748 // Check for InnerClasses tag
3749 if (parsed_innerclasses_attribute) {
3750 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3751 return;
3752 } else {
3753 parsed_innerclasses_attribute = true;
3754 }
3755 inner_classes_attribute_start = cfs->current();
3756 inner_classes_attribute_length = attribute_length;
3757 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3758 } else if (tag == vmSymbols::tag_synthetic()) {
3759 // Check for Synthetic tag
3760 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3761 if (attribute_length != 0) {
3762 classfile_parse_error(
3763 "Invalid Synthetic classfile attribute length %u in class file %s",
3764 attribute_length, THREAD);
3765 return;
3766 }
3767 parse_classfile_synthetic_attribute();
3768 } else if (tag == vmSymbols::tag_deprecated()) {
3769 // Check for Deprecated tag - 4276120
3770 if (attribute_length != 0) {
3771 classfile_parse_error(
3772 "Invalid Deprecated classfile attribute length %u in class file %s",
3773 attribute_length, THREAD);
3774 return;
3775 }
3776 } else if (_major_version >= JAVA_1_5_VERSION) {
3777 if (tag == vmSymbols::tag_signature()) {
3778 if (_generic_signature_index != 0) {
3779 classfile_parse_error(
3780 "Multiple Signature attributes in class file %s", THREAD);
3781 return;
3782 }
3783 if (attribute_length != 2) {
3784 classfile_parse_error(
3785 "Wrong Signature attribute length %u in class file %s",
3786 attribute_length, THREAD);
3787 return;
3788 }
3789 parse_classfile_signature_attribute(cfs, CHECK);
3790 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3791 if (runtime_visible_annotations != nullptr) {
3792 classfile_parse_error(
3793 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3794 return;
3795 }
3796 runtime_visible_annotations_length = attribute_length;
3797 runtime_visible_annotations = cfs->current();
3798 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3799 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3800 parse_annotations(cp,
3801 runtime_visible_annotations,
3802 runtime_visible_annotations_length,
3803 parsed_annotations,
3804 _loader_data,
3805 _can_access_vm_annotations);
3806 cfs->skip_u1_fast(runtime_visible_annotations_length);
3807 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3808 if (runtime_invisible_annotations_exists) {
3809 classfile_parse_error(
3810 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3811 return;
3812 }
3813 runtime_invisible_annotations_exists = true;
3814 if (PreserveAllAnnotations) {
3815 runtime_invisible_annotations_length = attribute_length;
3816 runtime_invisible_annotations = cfs->current();
3817 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
3818 }
3819 cfs->skip_u1(attribute_length, CHECK);
3820 } else if (tag == vmSymbols::tag_enclosing_method()) {
3821 if (parsed_enclosingmethod_attribute) {
3822 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3823 return;
3824 } else {
3825 parsed_enclosingmethod_attribute = true;
3826 }
3827 guarantee_property(attribute_length == 4,
3828 "Wrong EnclosingMethod attribute length %u in class file %s",
3829 attribute_length, CHECK);
3830 cfs->guarantee_more(4, CHECK); // class_index, method_index
3831 enclosing_method_class_index = cfs->get_u2_fast();
3832 enclosing_method_method_index = cfs->get_u2_fast();
3833 if (enclosing_method_class_index == 0) {
3834 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3835 return;
3836 }
3837 // Validate the constant pool indices and types
3838 check_property(valid_klass_reference_at(enclosing_method_class_index),
3839 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3840 if (enclosing_method_method_index != 0 &&
3841 (!cp->is_within_bounds(enclosing_method_method_index) ||
3842 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3843 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3844 return;
3845 }
3846 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3847 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3848 if (parsed_bootstrap_methods_attribute) {
3849 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3850 return;
3851 }
3852 parsed_bootstrap_methods_attribute = true;
3853 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3854 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3855 if (runtime_visible_type_annotations != nullptr) {
3856 classfile_parse_error(
3857 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3858 return;
3859 }
3860 runtime_visible_type_annotations_length = attribute_length;
3861 runtime_visible_type_annotations = cfs->current();
3862 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3863 // No need for the VM to parse Type annotations
3864 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3865 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3866 if (runtime_invisible_type_annotations_exists) {
3867 classfile_parse_error(
3868 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3869 return;
3870 } else {
3871 runtime_invisible_type_annotations_exists = true;
3872 }
3873 if (PreserveAllAnnotations) {
3874 runtime_invisible_type_annotations_length = attribute_length;
3875 runtime_invisible_type_annotations = cfs->current();
3876 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
3877 }
3878 cfs->skip_u1(attribute_length, CHECK);
3879 } else if (_major_version >= JAVA_11_VERSION) {
3880 if (tag == vmSymbols::tag_nest_members()) {
3881 // Check for NestMembers tag
3882 if (parsed_nest_members_attribute) {
3883 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3884 return;
3885 } else {
3886 parsed_nest_members_attribute = true;
3887 }
3888 if (parsed_nest_host_attribute) {
3889 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3890 return;
3891 }
3892 nest_members_attribute_start = cfs->current();
3893 nest_members_attribute_length = attribute_length;
3894 cfs->skip_u1(nest_members_attribute_length, CHECK);
3895 } else if (tag == vmSymbols::tag_nest_host()) {
3896 if (parsed_nest_host_attribute) {
3897 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3898 return;
3899 } else {
3900 parsed_nest_host_attribute = true;
3901 }
3902 if (parsed_nest_members_attribute) {
3903 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3904 return;
3905 }
3906 if (_need_verify) {
3907 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3908 }
3909 cfs->guarantee_more(2, CHECK);
3910 u2 class_info_index = cfs->get_u2_fast();
3911 check_property(
3912 valid_klass_reference_at(class_info_index),
3913 "Nest-host class_info_index %u has bad constant type in class file %s",
3914 class_info_index, CHECK);
3915 _nest_host = class_info_index;
3916
3917 } else if (_major_version >= JAVA_16_VERSION) {
3918 if (tag == vmSymbols::tag_record()) {
3919 if (parsed_record_attribute) {
3920 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3921 return;
3922 }
3923 parsed_record_attribute = true;
3924 record_attribute_start = cfs->current();
3925 record_attribute_length = attribute_length;
3926 } else if (_major_version >= JAVA_17_VERSION) {
3927 if (tag == vmSymbols::tag_permitted_subclasses()) {
3928 if (parsed_permitted_subclasses_attribute) {
3929 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3930 return;
3931 }
3932 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3933 if (_access_flags.is_final()) {
3934 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3935 return;
3936 }
3937 parsed_permitted_subclasses_attribute = true;
3938 permitted_subclasses_attribute_start = cfs->current();
3939 permitted_subclasses_attribute_length = attribute_length;
3940 }
3941 if (EnableValhalla && tag == vmSymbols::tag_preload()) {
3942 if (parsed_preload_attribute) {
3943 classfile_parse_error("Multiple Preload attributes in class file %s", CHECK);
3944 return;
3945 }
3946 parsed_preload_attribute = true;
3947 preload_attribute_start = cfs->current();
3948 preload_attribute_length = attribute_length;
3949 }
3950 }
3951 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3952 cfs->skip_u1(attribute_length, CHECK);
3953 } else {
3954 // Unknown attribute
3955 cfs->skip_u1(attribute_length, CHECK);
3956 }
3957 } else {
3958 // Unknown attribute
3959 cfs->skip_u1(attribute_length, CHECK);
3960 }
3961 } else {
3962 // Unknown attribute
3963 cfs->skip_u1(attribute_length, CHECK);
3964 }
3965 }
3966 _class_annotations = assemble_annotations(runtime_visible_annotations,
3967 runtime_visible_annotations_length,
3968 runtime_invisible_annotations,
3969 runtime_invisible_annotations_length,
3970 CHECK);
3971 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3972 runtime_visible_type_annotations_length,
3973 runtime_invisible_type_annotations,
3974 runtime_invisible_type_annotations_length,
3975 CHECK);
3976
3977 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3978 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3979 cfs,
3980 cp,
3981 inner_classes_attribute_start,
3982 parsed_innerclasses_attribute,
3983 enclosing_method_class_index,
3984 enclosing_method_method_index,
3985 CHECK);
3986 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3987 guarantee_property(
3988 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3989 "Wrong InnerClasses attribute length in class file %s", CHECK);
3990 }
3991 }
3992
3993 if (parsed_nest_members_attribute) {
3994 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3995 cfs,
3996 nest_members_attribute_start,
3997 CHECK);
3998 if (_need_verify) {
3999 guarantee_property(
4000 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
4001 "Wrong NestMembers attribute length in class file %s", CHECK);
4002 }
4003 }
4004
4005 if (parsed_record_attribute) {
4006 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
4007 cfs,
4008 cp,
4009 record_attribute_start,
4010 CHECK);
4011 if (_need_verify) {
4012 guarantee_property(record_attribute_length == calculated_attr_length,
4013 "Record attribute has wrong length in class file %s",
4014 CHECK);
4015 }
4016 }
4017
4018 if (parsed_permitted_subclasses_attribute) {
4019 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
4020 cfs,
4021 permitted_subclasses_attribute_start,
4022 CHECK);
4023 if (_need_verify) {
4024 guarantee_property(
4025 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
4026 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
4027 }
4028 }
4029
4030 if (parsed_preload_attribute) {
4031 const u2 num_classes = parse_classfile_preload_attribute(
4032 cfs,
4033 preload_attribute_start,
4034 CHECK);
4035 if (_need_verify) {
4036 guarantee_property(
4037 preload_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
4038 "Wrong Preload attribute length in class file %s", CHECK);
4039 }
4040 }
4041
4042 if (_max_bootstrap_specifier_index >= 0) {
4043 guarantee_property(parsed_bootstrap_methods_attribute,
4044 "Missing BootstrapMethods attribute in class file %s", CHECK);
4045 }
4046 }
4047
4048 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
4049 assert(k != nullptr, "invariant");
4050
4051 if (_synthetic_flag)
4052 k->set_is_synthetic();
4053 if (_sourcefile_index != 0) {
4054 k->set_source_file_name_index(_sourcefile_index);
4055 }
4056 if (_generic_signature_index != 0) {
4057 k->set_generic_signature_index(_generic_signature_index);
4058 }
4059 if (_sde_buffer != nullptr) {
4060 k->set_source_debug_extension(_sde_buffer, _sde_length);
4061 }
4062 }
4063
4064 // Create the Annotations object that will
4065 // hold the annotations array for the Klass.
4066 void ClassFileParser::create_combined_annotations(TRAPS) {
4067 if (_class_annotations == nullptr &&
4068 _class_type_annotations == nullptr &&
4069 _fields_annotations == nullptr &&
4070 _fields_type_annotations == nullptr) {
4071 // Don't create the Annotations object unnecessarily.
4072 return;
4073 }
4074
4075 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
4076 annotations->set_class_annotations(_class_annotations);
4077 annotations->set_class_type_annotations(_class_type_annotations);
4078 annotations->set_fields_annotations(_fields_annotations);
4079 annotations->set_fields_type_annotations(_fields_type_annotations);
4080
4081 // This is the Annotations object that will be
4082 // assigned to InstanceKlass being constructed.
4083 _combined_annotations = annotations;
4084
4085 // The annotations arrays below has been transferred the
4086 // _combined_annotations so these fields can now be cleared.
4087 _class_annotations = nullptr;
4088 _class_type_annotations = nullptr;
4089 _fields_annotations = nullptr;
4090 _fields_type_annotations = nullptr;
4091 }
4092
4093 // Transfer ownership of metadata allocated to the InstanceKlass.
4094 void ClassFileParser::apply_parsed_class_metadata(
4095 InstanceKlass* this_klass,
4096 int java_fields_count) {
4097 assert(this_klass != nullptr, "invariant");
4098
4099 _cp->set_pool_holder(this_klass);
4100 this_klass->set_constants(_cp);
4101 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
4102 this_klass->set_fields_status(_fields_status);
4103 this_klass->set_methods(_methods);
4104 this_klass->set_inner_classes(_inner_classes);
4105 this_klass->set_nest_members(_nest_members);
4106 this_klass->set_nest_host_index(_nest_host);
4107 this_klass->set_preload_classes(_preload_classes);
4108 this_klass->set_annotations(_combined_annotations);
4109 this_klass->set_permitted_subclasses(_permitted_subclasses);
4110 this_klass->set_record_components(_record_components);
4111 this_klass->set_inline_type_field_klasses_array(_inline_type_field_klasses);
4112 // Delay the setting of _local_interfaces and _transitive_interfaces until after
4113 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
4114 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
4115 // its _super. If an OOM occurs while loading the current klass, its _super field
4116 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
4117 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
4118 // dereferences to the deallocated _transitive_interfaces will result in a crash.
4119
4120 // Clear out these fields so they don't get deallocated by the destructor
4121 clear_class_metadata();
4122 }
4123
4124 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
4125 int runtime_visible_annotations_length,
4126 const u1* const runtime_invisible_annotations,
4127 int runtime_invisible_annotations_length,
4128 TRAPS) {
4129 AnnotationArray* annotations = nullptr;
4130 if (runtime_visible_annotations != nullptr ||
4131 runtime_invisible_annotations != nullptr) {
4132 annotations = MetadataFactory::new_array<u1>(_loader_data,
4133 runtime_visible_annotations_length +
4134 runtime_invisible_annotations_length,
4135 CHECK_(annotations));
4136 if (runtime_visible_annotations != nullptr) {
4137 for (int i = 0; i < runtime_visible_annotations_length; i++) {
4138 annotations->at_put(i, runtime_visible_annotations[i]);
4139 }
4140 }
4141 if (runtime_invisible_annotations != nullptr) {
4142 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4143 int append = runtime_visible_annotations_length+i;
4144 annotations->at_put(append, runtime_invisible_annotations[i]);
4145 }
4146 }
4147 }
4148 return annotations;
4149 }
4150
4151 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4152 const int super_class_index,
4153 const bool need_verify,
4154 TRAPS) {
4155 assert(cp != nullptr, "invariant");
4156 const InstanceKlass* super_klass = nullptr;
4157
4158 if (super_class_index == 0) {
4159 check_property(_class_name == vmSymbols::java_lang_Object(),
4160 "Invalid superclass index 0 in class file %s",
4161 CHECK_NULL);
4162 } else {
4163 check_property(valid_klass_reference_at(super_class_index),
4164 "Invalid superclass index %u in class file %s",
4165 super_class_index,
4166 CHECK_NULL);
4167 // The class name should be legal because it is checked when parsing constant pool.
4168 // However, make sure it is not an array type.
4169 if (cp->tag_at(super_class_index).is_klass()) {
4170 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4171 }
4172 if (need_verify) {
4173 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4174 guarantee_property(!is_array,
4175 "Bad superclass name in class file %s", CHECK_NULL);
4176 }
4177 }
4178 return super_klass;
4179 }
4180
4181 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4182 _max_nonstatic_oop_maps = max_blocks;
4183 _nonstatic_oop_map_count = 0;
4184 if (max_blocks == 0) {
4185 _nonstatic_oop_maps = nullptr;
4186 } else {
4187 _nonstatic_oop_maps =
4188 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4189 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4190 }
4191 }
4192
4193 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4194 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4195 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4196 }
4197
4198 // addition of super oop maps
4199 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4200 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4201 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4202
4203 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4204 _nonstatic_oop_map_count += nof_blocks;
4205 }
4206
4207 // collection of oops
4208 void OopMapBlocksBuilder::add(int offset, int count) {
4209 if (_nonstatic_oop_map_count == 0) {
4210 _nonstatic_oop_map_count++;
4211 }
4212 OopMapBlock* nonstatic_oop_map = last_oop_map();
4213 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4214 nonstatic_oop_map->set_offset(offset);
4215 nonstatic_oop_map->set_count(count);
4216 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4217 nonstatic_oop_map->increment_count(count);
4218 } else { // Need a new one...
4219 _nonstatic_oop_map_count++;
4220 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4221 nonstatic_oop_map = last_oop_map();
4222 nonstatic_oop_map->set_offset(offset);
4223 nonstatic_oop_map->set_count(count);
4224 }
4225 }
4226
4227 // general purpose copy, e.g. into allocated instanceKlass
4228 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4229 if (_nonstatic_oop_map_count != 0) {
4230 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4231 }
4232 }
4233
4234 // Sort and compact adjacent blocks
4235 void OopMapBlocksBuilder::compact() {
4236 if (_nonstatic_oop_map_count <= 1) {
4237 return;
4238 }
4239 /*
4240 * Since field layout sneaks in oops before values, we will be able to condense
4241 * blocks. There is potential to compact between super, own refs and values
4242 * containing refs.
4243 *
4244 * Currently compaction is slightly limited due to values being 8 byte aligned.
4245 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4246 * and maybe it doesn't need to be.
4247 */
4248 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4249 (_sort_Fn)OopMapBlock::compare_offset);
4250 if (_nonstatic_oop_map_count < 2) {
4251 return;
4252 }
4253
4254 // Make a temp copy, and iterate through and copy back into the original
4255 ResourceMark rm;
4256 OopMapBlock* oop_maps_copy =
4257 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4258 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4259 copy(oop_maps_copy);
4260 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4261 unsigned int new_count = 1;
4262 oop_maps_copy++;
4263 while(oop_maps_copy < oop_maps_copy_end) {
4264 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4265 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4266 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4267 } else {
4268 nonstatic_oop_map++;
4269 new_count++;
4270 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4271 nonstatic_oop_map->set_count(oop_maps_copy->count());
4272 }
4273 oop_maps_copy++;
4274 }
4275 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4276 _nonstatic_oop_map_count = new_count;
4277 }
4278
4279 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4280 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4281 if (_nonstatic_oop_map_count > 0) {
4282 OopMapBlock* map = _nonstatic_oop_maps;
4283 OopMapBlock* last_map = last_oop_map();
4284 assert(map <= last_map, "Last less than first");
4285 while (map <= last_map) {
4286 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4287 map->offset() + map->offset_span() - heapOopSize, map->count());
4288 map++;
4289 }
4290 }
4291 }
4292
4293 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4294 print_on(st);
4295 }
4296
4297 void ClassFileParser::throwInlineTypeLimitation(THREAD_AND_LOCATION_DECL,
4298 const char* msg,
4299 const Symbol* name,
4300 const Symbol* sig) const {
4301
4302 ResourceMark rm(THREAD);
4303 if (name == nullptr || sig == nullptr) {
4304 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4305 vmSymbols::java_lang_ClassFormatError(),
4306 "class: %s - %s", _class_name->as_C_string(), msg);
4307 }
4308 else {
4309 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4310 vmSymbols::java_lang_ClassFormatError(),
4311 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4312 _class_name->as_C_string(), msg);
4313 }
4314 }
4315
4316 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4317 assert(ik != nullptr, "invariant");
4318
4319 const InstanceKlass* const super = ik->java_super();
4320
4321 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4322 // in which case we don't have to register objects as finalizable
4323 if (!_has_empty_finalizer) {
4324 if (_has_finalizer ||
4325 (super != nullptr && super->has_finalizer())) {
4326 ik->set_has_finalizer();
4327 }
4328 }
4329
4330 #ifdef ASSERT
4331 bool f = false;
4332 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4333 vmSymbols::void_method_signature());
4334 if (InstanceKlass::is_finalization_enabled() &&
4335 (m != nullptr) && !m->is_empty_method()) {
4336 f = true;
4337 }
4338
4339 // Spec doesn't prevent agent from redefinition of empty finalizer.
4340 // Despite the fact that it's generally bad idea and redefined finalizer
4341 // will not work as expected we shouldn't abort vm in this case
4342 if (!ik->has_redefined_this_or_super()) {
4343 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4344 }
4345 #endif
4346
4347 // Check if this klass supports the java.lang.Cloneable interface
4348 if (vmClasses::Cloneable_klass_loaded()) {
4349 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4350 if (ik->is_inline_klass()) {
4351 JavaThread *THREAD = JavaThread::current();
4352 throwInlineTypeLimitation(THREAD_AND_LOCATION, "Inline Types do not support Cloneable");
4353 return;
4354 }
4355 ik->set_is_cloneable();
4356 }
4357 }
4358
4359 // Check if this klass has a vanilla default constructor
4360 if (super == nullptr) {
4361 // java.lang.Object has empty default constructor
4362 ik->set_has_vanilla_constructor();
4363 } else {
4364 if (super->has_vanilla_constructor() &&
4365 _has_vanilla_constructor) {
4366 ik->set_has_vanilla_constructor();
4367 }
4368 #ifdef ASSERT
4369 bool v = false;
4370 if (super->has_vanilla_constructor()) {
4371 const Method* const constructor =
4372 ik->find_method(vmSymbols::object_initializer_name(),
4373 vmSymbols::void_method_signature());
4374 if (constructor != nullptr && constructor->is_vanilla_constructor()) {
4375 v = true;
4376 }
4377 }
4378 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4379 #endif
4380 }
4381
4382 // If it cannot be fast-path allocated, set a bit in the layout helper.
4383 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4384 assert(ik->size_helper() > 0, "layout_helper is initialized");
4385 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4386 || ik->is_abstract() || ik->is_interface()
4387 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4388 || ik->size_helper() >= FastAllocateSizeLimit) {
4389 // Forbid fast-path allocation.
4390 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4391 ik->set_layout_helper(lh);
4392 }
4393 }
4394
4395 bool ClassFileParser::supports_inline_types() const {
4396 // Inline types are only supported by class file version 61.65535 and later
4397 return _major_version > JAVA_22_VERSION ||
4398 (_major_version == JAVA_22_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4399 }
4400
4401 // utility methods for appending an array with check for duplicates
4402
4403 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4404 const Array<InstanceKlass*>* const ifs) {
4405 // iterate over new interfaces
4406 for (int i = 0; i < ifs->length(); i++) {
4407 InstanceKlass* const e = ifs->at(i);
4408 assert(e->is_klass() && e->is_interface(), "just checking");
4409 // add new interface
4410 result->append_if_missing(e);
4411 }
4412 }
4413
4414 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4415 Array<InstanceKlass*>* local_ifs,
4416 ClassLoaderData* loader_data,
4417 TRAPS) {
4418 assert(local_ifs != nullptr, "invariant");
4419 assert(loader_data != nullptr, "invariant");
4420
4421 // Compute maximum size for transitive interfaces
4422 int max_transitive_size = 0;
4423 int super_size = 0;
4424 // Add superclass transitive interfaces size
4425 if (super != nullptr) {
4426 super_size = super->transitive_interfaces()->length();
4427 max_transitive_size += super_size;
4428 }
4429 // Add local interfaces' super interfaces
4430 const int local_size = local_ifs->length();
4431 for (int i = 0; i < local_size; i++) {
4432 InstanceKlass* const l = local_ifs->at(i);
4433 max_transitive_size += l->transitive_interfaces()->length();
4434 }
4435 // Finally add local interfaces
4436 max_transitive_size += local_size;
4437 // Construct array
4438 if (max_transitive_size == 0) {
4439 // no interfaces, use canonicalized array
4440 return Universe::the_empty_instance_klass_array();
4441 } else if (max_transitive_size == super_size) {
4442 // no new local interfaces added, share superklass' transitive interface array
4443 return super->transitive_interfaces();
4444 // The three lines below are commented to work around bug JDK-8245487
4445 // } else if (max_transitive_size == local_size) {
4446 // // only local interfaces added, share local interface array
4447 // return local_ifs;
4448 } else {
4449 ResourceMark rm;
4450 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4451
4452 // Copy down from superclass
4453 if (super != nullptr) {
4454 append_interfaces(result, super->transitive_interfaces());
4455 }
4456
4457 // Copy down from local interfaces' superinterfaces
4458 for (int i = 0; i < local_size; i++) {
4459 InstanceKlass* const l = local_ifs->at(i);
4460 append_interfaces(result, l->transitive_interfaces());
4461 }
4462 // Finally add local interfaces
4463 append_interfaces(result, local_ifs);
4464
4465 // length will be less than the max_transitive_size if duplicates were removed
4466 const int length = result->length();
4467 assert(length <= max_transitive_size, "just checking");
4468
4469 Array<InstanceKlass*>* const new_result =
4470 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4471 for (int i = 0; i < length; i++) {
4472 InstanceKlass* const e = result->at(i);
4473 assert(e != nullptr, "just checking");
4474 new_result->at_put(i, e);
4475 }
4476 return new_result;
4477 }
4478 }
4479
4480 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4481 assert(this_klass != nullptr, "invariant");
4482 const Klass* const super = this_klass->super();
4483
4484 if (super != nullptr) {
4485 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4486
4487 if (super->is_final()) {
4488 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4489 return;
4490 }
4491
4492 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4493 classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4494 return;
4495 }
4496
4497 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4498 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4499 // for a value classes. So, it is treated as a special case for now.
4500 if (!this_klass->access_flags().is_identity_class() &&
4501 super_ik->name() != vmSymbols::java_lang_Object() &&
4502 super_ik->is_identity_class()) {
4503 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4504 return;
4505 }
4506
4507 // If the loader is not the boot loader then throw an exception if its
4508 // superclass is in package jdk.internal.reflect and its loader is not a
4509 // special reflection class loader
4510 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4511 PackageEntry* super_package = super->package();
4512 if (super_package != nullptr &&
4513 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4514 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4515 ResourceMark rm(THREAD);
4516 Exceptions::fthrow(
4517 THREAD_AND_LOCATION,
4518 vmSymbols::java_lang_IllegalAccessError(),
4519 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4520 this_klass->external_name(),
4521 this_klass->class_loader_data()->loader_name_and_id(),
4522 super->external_name());
4523 return;
4524 }
4525 }
4526
4527 Reflection::VerifyClassAccessResults vca_result =
4528 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4529 if (vca_result != Reflection::ACCESS_OK) {
4530 ResourceMark rm(THREAD);
4531 char* msg = Reflection::verify_class_access_msg(this_klass,
4532 InstanceKlass::cast(super),
4533 vca_result);
4534 if (msg == nullptr) {
4535 bool same_module = (this_klass->module() == super->module());
4536 Exceptions::fthrow(
4537 THREAD_AND_LOCATION,
4538 vmSymbols::java_lang_IllegalAccessError(),
4539 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4540 this_klass->external_name(),
4541 super->is_abstract() ? "abstract " : "",
4542 super->external_name(),
4543 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4544 (same_module) ? "" : "; ",
4545 (same_module) ? "" : super->class_in_module_of_loader());
4546 } else {
4547 // Add additional message content.
4548 Exceptions::fthrow(
4549 THREAD_AND_LOCATION,
4550 vmSymbols::java_lang_IllegalAccessError(),
4551 "superclass access check failed: %s",
4552 msg);
4553 }
4554 }
4555 }
4556 }
4557
4558
4559 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4560 assert(this_klass != nullptr, "invariant");
4561 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4562 const int lng = local_interfaces->length();
4563 for (int i = lng - 1; i >= 0; i--) {
4564 InstanceKlass* const k = local_interfaces->at(i);
4565 assert (k != nullptr && k->is_interface(), "invalid interface");
4566
4567 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4568 classfile_icce_error(this_klass->is_interface() ?
4569 "class %s cannot extend sealed interface %s" :
4570 "class %s cannot implement sealed interface %s",
4571 k, THREAD);
4572 return;
4573 }
4574
4575 Reflection::VerifyClassAccessResults vca_result =
4576 Reflection::verify_class_access(this_klass, k, false);
4577 if (vca_result != Reflection::ACCESS_OK) {
4578 ResourceMark rm(THREAD);
4579 char* msg = Reflection::verify_class_access_msg(this_klass,
4580 k,
4581 vca_result);
4582 if (msg == nullptr) {
4583 bool same_module = (this_klass->module() == k->module());
4584 Exceptions::fthrow(
4585 THREAD_AND_LOCATION,
4586 vmSymbols::java_lang_IllegalAccessError(),
4587 "class %s cannot access its superinterface %s (%s%s%s)",
4588 this_klass->external_name(),
4589 k->external_name(),
4590 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4591 (same_module) ? "" : "; ",
4592 (same_module) ? "" : k->class_in_module_of_loader());
4593 return;
4594 } else {
4595 // Add additional message content.
4596 Exceptions::fthrow(
4597 THREAD_AND_LOCATION,
4598 vmSymbols::java_lang_IllegalAccessError(),
4599 "superinterface check failed: %s",
4600 msg);
4601 return;
4602 }
4603 }
4604 }
4605 }
4606
4607
4608 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4609 assert(this_klass != nullptr, "invariant");
4610 const Array<Method*>* const methods = this_klass->methods();
4611 const int num_methods = methods->length();
4612
4613 // go thru each method and check if it overrides a final method
4614 for (int index = 0; index < num_methods; index++) {
4615 const Method* const m = methods->at(index);
4616
4617 // skip private, static, and <init> methods
4618 if ((!m->is_private() && !m->is_static()) &&
4619 (m->name() != vmSymbols::object_initializer_name())) {
4620
4621 const Symbol* const name = m->name();
4622 const Symbol* const signature = m->signature();
4623 const InstanceKlass* k = this_klass->java_super();
4624 const Method* super_m = nullptr;
4625 while (k != nullptr) {
4626 // skip supers that don't have final methods.
4627 if (k->has_final_method()) {
4628 // lookup a matching method in the super class hierarchy
4629 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4630 if (super_m == nullptr) {
4631 break; // didn't find any match; get out
4632 }
4633
4634 if (super_m->is_final() && !super_m->is_static() &&
4635 !super_m->access_flags().is_private()) {
4636 // matching method in super is final, and not static or private
4637 bool can_access = Reflection::verify_member_access(this_klass,
4638 super_m->method_holder(),
4639 super_m->method_holder(),
4640 super_m->access_flags(),
4641 false, false, CHECK);
4642 if (can_access) {
4643 // this class can access super final method and therefore override
4644 ResourceMark rm(THREAD);
4645 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4646 err_msg("class %s overrides final method %s.%s%s",
4647 this_klass->external_name(),
4648 super_m->method_holder()->external_name(),
4649 name->as_C_string(),
4650 signature->as_C_string()));
4651 }
4652 }
4653
4654 // continue to look from super_m's holder's super.
4655 k = super_m->method_holder()->java_super();
4656 continue;
4657 }
4658
4659 k = k->java_super();
4660 }
4661 }
4662 }
4663 }
4664
4665
4666 // assumes that this_klass is an interface
4667 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4668 assert(this_klass != nullptr, "invariant");
4669 assert(this_klass->is_interface(), "not an interface");
4670 const Array<Method*>* methods = this_klass->methods();
4671 const int num_methods = methods->length();
4672
4673 for (int index = 0; index < num_methods; index++) {
4674 const Method* const m = methods->at(index);
4675 // if m is static and not the init method, throw a verify error
4676 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4677 ResourceMark rm(THREAD);
4678 Exceptions::fthrow(
4679 THREAD_AND_LOCATION,
4680 vmSymbols::java_lang_VerifyError(),
4681 "Illegal static method %s in interface %s",
4682 m->name()->as_C_string(),
4683 this_klass->external_name()
4684 );
4685 return;
4686 }
4687 }
4688 }
4689
4690 // utility methods for format checking
4691
4692 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4693 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4694 const bool is_inner_class = name != nullptr;
4695 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4696 if (is_module) {
4697 ResourceMark rm(THREAD);
4698 Exceptions::fthrow(
4699 THREAD_AND_LOCATION,
4700 vmSymbols::java_lang_NoClassDefFoundError(),
4701 "%s is not a class because access_flag ACC_MODULE is set",
4702 _class_name->as_C_string());
4703 return;
4704 }
4705
4706 if (!_need_verify) { return; }
4707
4708 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4709 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4710 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4711 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4712 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4713 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4714 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4715
4716 if ((is_abstract && is_final) ||
4717 (is_interface && !is_abstract) ||
4718 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4719 (!is_interface && major_gte_1_5 && is_annotation)) {
4720 ResourceMark rm(THREAD);
4721 const char* class_note = "";
4722 if (!is_identity) class_note = " (a value class)";
4723 if (name == nullptr) { // Not an inner class
4724 Exceptions::fthrow(
4725 THREAD_AND_LOCATION,
4726 vmSymbols::java_lang_ClassFormatError(),
4727 "Illegal class modifiers in class %s%s: 0x%X",
4728 _class_name->as_C_string(), class_note, flags
4729 );
4730 return;
4731 } else {
4732 Exceptions::fthrow(
4733 THREAD_AND_LOCATION,
4734 vmSymbols::java_lang_ClassFormatError(),
4735 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4736 name, class_note, _class_name->as_C_string(), flags
4737 );
4738 return;
4739 }
4740 }
4741 }
4742
4743 static bool has_illegal_visibility(jint flags) {
4744 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4745 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4746 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4747
4748 return ((is_public && is_protected) ||
4749 (is_public && is_private) ||
4750 (is_protected && is_private));
4751 }
4752
4753 // A legal major_version.minor_version must be one of the following:
4754 //
4755 // Major_version >= 45 and major_version < 56, any minor_version.
4756 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4757 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4758 //
4759 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4760 ResourceMark rm(THREAD);
4761 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4762 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4763 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4764 class_name, major, minor, THREAD);
4765 return;
4766 }
4767
4768 if (major > max_version) {
4769 Exceptions::fthrow(
4770 THREAD_AND_LOCATION,
4771 vmSymbols::java_lang_UnsupportedClassVersionError(),
4772 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4773 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4774 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4775 return;
4776 }
4777
4778 if (major < JAVA_12_VERSION || minor == 0) {
4779 return;
4780 }
4781
4782 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4783 if (major != max_version) {
4784 Exceptions::fthrow(
4785 THREAD_AND_LOCATION,
4786 vmSymbols::java_lang_UnsupportedClassVersionError(),
4787 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4788 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4789 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4790 return;
4791 }
4792
4793 if (!Arguments::enable_preview()) {
4794 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4795 class_name, major, minor, THREAD);
4796 return;
4797 }
4798
4799 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4800 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4801 class_name, major, minor, THREAD);
4802 }
4803 }
4804
4805 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4806 AccessFlags class_access_flags,
4807 TRAPS) const {
4808 if (!_need_verify) { return; }
4809
4810 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4811 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4812 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4813 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4814 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4815 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4816 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4817 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4818 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4819
4820 const bool is_interface = class_access_flags.is_interface();
4821 const bool is_abstract = class_access_flags.is_abstract();
4822 const bool is_identity_class = class_access_flags.is_identity_class();
4823
4824 bool is_illegal = false;
4825
4826 if (is_interface) {
4827 if (!is_public || !is_static || !is_final || is_private ||
4828 is_protected || is_volatile || is_transient ||
4829 (major_gte_1_5 && is_enum)) {
4830 is_illegal = true;
4831 }
4832 } else { // not interface
4833 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4834 is_illegal = true;
4835 } else {
4836 if (!is_identity_class && !is_abstract && !is_static && !is_final) {
4837 is_illegal = true;
4838 } else if (is_abstract && !is_identity_class && !is_static) {
4839 is_illegal = true;
4840 }
4841 }
4842 }
4843
4844 if (is_illegal) {
4845 ResourceMark rm(THREAD);
4846 Exceptions::fthrow(
4847 THREAD_AND_LOCATION,
4848 vmSymbols::java_lang_ClassFormatError(),
4849 "Illegal field modifiers in class %s: 0x%X",
4850 _class_name->as_C_string(), flags);
4851 return;
4852 }
4853 }
4854
4855 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4856 AccessFlags class_access_flags,
4857 const Symbol* name,
4858 TRAPS) const {
4859 if (!_need_verify) { return; }
4860
4861 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4862 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4863 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4864 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4865 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4866 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4867 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4868 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4869 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4870 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4871 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4872 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4873 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4874 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4875 // LW401 CR required: removal of value factories support
4876 const bool is_interface = class_access_flags.is_interface();
4877 const bool is_value_class = !class_access_flags.is_identity_class();
4878 const bool is_identity_class = class_access_flags.is_identity_class();
4879 const bool is_abstract_class = class_access_flags.is_abstract();
4880
4881 bool is_illegal = false;
4882
4883 const char* class_note = "";
4884 if (is_interface) {
4885 if (major_gte_8) {
4886 // Class file version is JAVA_8_VERSION or later Methods of
4887 // interfaces may set any of the flags except ACC_PROTECTED,
4888 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4889 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4890 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4891 (is_native || is_protected || is_final || is_synchronized) ||
4892 // If a specific method of a class or interface has its
4893 // ACC_ABSTRACT flag set, it must not have any of its
4894 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4895 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4896 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4897 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4898 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4899 is_illegal = true;
4900 }
4901 } else if (major_gte_1_5) {
4902 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4903 if (!is_public || is_private || is_protected || is_static || is_final ||
4904 is_synchronized || is_native || !is_abstract || is_strict) {
4905 is_illegal = true;
4906 }
4907 } else {
4908 // Class file version is pre-JAVA_1_5_VERSION
4909 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4910 is_illegal = true;
4911 }
4912 }
4913 } else { // not interface
4914 if (has_illegal_visibility(flags)) {
4915 is_illegal = true;
4916 } else {
4917 if (is_initializer) {
4918 if (is_static || is_final || is_synchronized || is_native ||
4919 is_abstract || (major_gte_1_5 && is_bridge)) {
4920 is_illegal = true;
4921 }
4922 } else { // not initializer
4923 if (!is_identity_class && is_synchronized && !is_static) {
4924 is_illegal = true;
4925 class_note = " (not an identity class)";
4926 } else {
4927 if (is_abstract) {
4928 if ((is_final || is_native || is_private || is_static ||
4929 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4930 is_illegal = true;
4931 }
4932 }
4933 }
4934 }
4935 }
4936 }
4937
4938 if (is_illegal) {
4939 ResourceMark rm(THREAD);
4940 if (is_value_class && is_initializer) {
4941 Exceptions::fthrow(
4942 THREAD_AND_LOCATION,
4943 vmSymbols::java_lang_ClassFormatError(),
4944 "Method <init> is not allowed in value class %s",
4945 _class_name->as_C_string());
4946 } else {
4947 Exceptions::fthrow(
4948 THREAD_AND_LOCATION,
4949 vmSymbols::java_lang_ClassFormatError(),
4950 "Method %s in class %s%s has illegal modifiers: 0x%X",
4951 name->as_C_string(), _class_name->as_C_string(),
4952 class_note, flags);
4953 }
4954 return;
4955 }
4956 }
4957
4958 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4959 int length,
4960 TRAPS) const {
4961 assert(_need_verify, "only called when _need_verify is true");
4962 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4963 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4964 }
4965 }
4966
4967 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4968 // In class names, '/' separates unqualified names. This is verified in this function also.
4969 // Method names also may not contain the characters '<' or '>', unless <init>
4970 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4971 // method. Because these names have been checked as special cases before
4972 // calling this method in verify_legal_method_name.
4973 //
4974 // This method is also called from the modular system APIs in modules.cpp
4975 // to verify the validity of module and package names.
4976 bool ClassFileParser::verify_unqualified_name(const char* name,
4977 unsigned int length,
4978 int type) {
4979 if (length == 0) return false; // Must have at least one char.
4980 for (const char* p = name; p != name + length; p++) {
4981 switch(*p) {
4982 case JVM_SIGNATURE_DOT:
4983 case JVM_SIGNATURE_ENDCLASS:
4984 case JVM_SIGNATURE_ARRAY:
4985 // do not permit '.', ';', or '['
4986 return false;
4987 case JVM_SIGNATURE_SLASH:
4988 // check for '//' or leading or trailing '/' which are not legal
4989 // unqualified name must not be empty
4990 if (type == ClassFileParser::LegalClass) {
4991 if (p == name || p+1 >= name+length ||
4992 *(p+1) == JVM_SIGNATURE_SLASH) {
4993 return false;
4994 }
4995 } else {
4996 return false; // do not permit '/' unless it's class name
4997 }
4998 break;
4999 case JVM_SIGNATURE_SPECIAL:
5000 case JVM_SIGNATURE_ENDSPECIAL:
5001 // do not permit '<' or '>' in method names
5002 if (type == ClassFileParser::LegalMethod) {
5003 return false;
5004 }
5005 }
5006 }
5007 return true;
5008 }
5009
5010 bool ClassFileParser::is_class_in_preload_attribute(Symbol *klass) {
5011 if (_preload_classes == nullptr) return false;
5012 for (int i = 0; i < _preload_classes->length(); i++) {
5013 Symbol* class_name = _cp->klass_at_noresolve(_preload_classes->at(i));
5014 if (class_name == klass) return true;
5015 }
5016 return false;
5017 }
5018
5019 // Take pointer to a UTF8 byte string (not NUL-terminated).
5020 // Skip over the longest part of the string that could
5021 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
5022 // Return a pointer to just past the fieldname.
5023 // Return null if no fieldname at all was found, or in the case of slash_ok
5024 // being true, we saw consecutive slashes (meaning we were looking for a
5025 // qualified path but found something that was badly-formed).
5026 static const char* skip_over_field_name(const char* const name,
5027 bool slash_ok,
5028 unsigned int length) {
5029 const char* p;
5030 jboolean last_is_slash = false;
5031 jboolean not_first_ch = false;
5032
5033 for (p = name; p != name + length; not_first_ch = true) {
5034 const char* old_p = p;
5035 jchar ch = *p;
5036 if (ch < 128) {
5037 p++;
5038 // quick check for ascii
5039 if ((ch >= 'a' && ch <= 'z') ||
5040 (ch >= 'A' && ch <= 'Z') ||
5041 (ch == '_' || ch == '$') ||
5042 (not_first_ch && ch >= '0' && ch <= '9')) {
5043 last_is_slash = false;
5044 continue;
5045 }
5046 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5047 if (last_is_slash) {
5048 return nullptr; // Don't permit consecutive slashes
5049 }
5050 last_is_slash = true;
5051 continue;
5052 }
5053 }
5054 else {
5055 jint unicode_ch;
5056 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5057 p = tmp_p;
5058 last_is_slash = false;
5059 // Check if ch is Java identifier start or is Java identifier part
5060 // 4672820: call java.lang.Character methods directly without generating separate tables.
5061 EXCEPTION_MARK;
5062 // return value
5063 JavaValue result(T_BOOLEAN);
5064 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5065 JavaCallArguments args;
5066 args.push_int(unicode_ch);
5067
5068 if (not_first_ch) {
5069 // public static boolean isJavaIdentifierPart(char ch);
5070 JavaCalls::call_static(&result,
5071 vmClasses::Character_klass(),
5072 vmSymbols::isJavaIdentifierPart_name(),
5073 vmSymbols::int_bool_signature(),
5074 &args,
5075 THREAD);
5076 } else {
5077 // public static boolean isJavaIdentifierStart(char ch);
5078 JavaCalls::call_static(&result,
5079 vmClasses::Character_klass(),
5080 vmSymbols::isJavaIdentifierStart_name(),
5081 vmSymbols::int_bool_signature(),
5082 &args,
5083 THREAD);
5084 }
5085 if (HAS_PENDING_EXCEPTION) {
5086 CLEAR_PENDING_EXCEPTION;
5087 return nullptr;
5088 }
5089 if(result.get_jboolean()) {
5090 continue;
5091 }
5092 }
5093 return (not_first_ch) ? old_p : nullptr;
5094 }
5095 return (not_first_ch && !last_is_slash) ? p : nullptr;
5096 }
5097
5098 // Take pointer to a UTF8 byte string (not NUL-terminated).
5099 // Skip over the longest part of the string that could
5100 // be taken as a field signature. Allow "void" if void_ok.
5101 // Return a pointer to just past the signature.
5102 // Return null if no legal signature is found.
5103 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5104 bool void_ok,
5105 unsigned int length,
5106 TRAPS) const {
5107 unsigned int array_dim = 0;
5108 while (length > 0) {
5109 switch (signature[0]) {
5110 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
5111 case JVM_SIGNATURE_BOOLEAN:
5112 case JVM_SIGNATURE_BYTE:
5113 case JVM_SIGNATURE_CHAR:
5114 case JVM_SIGNATURE_SHORT:
5115 case JVM_SIGNATURE_INT:
5116 case JVM_SIGNATURE_FLOAT:
5117 case JVM_SIGNATURE_LONG:
5118 case JVM_SIGNATURE_DOUBLE:
5119 return signature + 1;
5120 case JVM_SIGNATURE_CLASS:
5121 {
5122 if (_major_version < JAVA_1_5_VERSION) {
5123 // Skip over the class name if one is there
5124 const char* const p = skip_over_field_name(signature + 1, true, --length);
5125
5126 // The next character better be a semicolon
5127 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5128 return p + 1;
5129 }
5130 }
5131 else {
5132 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5133 signature++;
5134 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5135 // Format check signature
5136 if (c != nullptr) {
5137 int newlen = pointer_delta_as_int(c, (char*) signature);
5138 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5139 if (!legal) {
5140 classfile_parse_error("Class name is empty or contains illegal character "
5141 "in descriptor in class file %s",
5142 THREAD);
5143 return nullptr;
5144 }
5145 return signature + newlen + 1;
5146 }
5147 }
5148 return nullptr;
5149 }
5150 case JVM_SIGNATURE_ARRAY:
5151 array_dim++;
5152 if (array_dim > 255) {
5153 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5154 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
5155 return nullptr;
5156 }
5157 // The rest of what's there better be a legal signature
5158 signature++;
5159 length--;
5160 void_ok = false;
5161 break;
5162 default:
5163 return nullptr;
5164 }
5165 }
5166 return nullptr;
5167 }
5168
5169 // Checks if name is a legal class name.
5170 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5171 if (!_need_verify || _relax_verify) { return; }
5172
5173 assert(name->refcount() > 0, "symbol must be kept alive");
5174 char* bytes = (char*)name->bytes();
5175 unsigned int length = name->utf8_length();
5176 bool legal = false;
5177
5178 if (length > 0) {
5179 const char* p;
5180 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5181 p = skip_over_field_signature(bytes, false, length, CHECK);
5182 legal = (p != nullptr) && ((p - bytes) == (int)length);
5183 } else if (_major_version < JAVA_1_5_VERSION) {
5184 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5185 p = skip_over_field_name(bytes, true, length);
5186 legal = (p != nullptr) && ((p - bytes) == (int)length);
5187 }
5188 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
5189 && bytes[length - 1] == ';' ) {
5190 // Support for L...; and Q...; descriptors
5191 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5192 } else {
5193 // 4900761: relax the constraints based on JSR202 spec
5194 // Class names may be drawn from the entire Unicode character set.
5195 // Identifiers between '/' must be unqualified names.
5196 // The utf8 string has been verified when parsing cpool entries.
5197 legal = verify_unqualified_name(bytes, length, LegalClass);
5198 }
5199 }
5200 if (!legal) {
5201 ResourceMark rm(THREAD);
5202 assert(_class_name != nullptr, "invariant");
5203 Exceptions::fthrow(
5204 THREAD_AND_LOCATION,
5205 vmSymbols::java_lang_ClassFormatError(),
5206 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5207 _class_name->as_C_string()
5208 );
5209 return;
5210 }
5211 }
5212
5213 // Checks if name is a legal field name.
5214 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5215 if (!_need_verify || _relax_verify) { return; }
5216
5217 char* bytes = (char*)name->bytes();
5218 unsigned int length = name->utf8_length();
5219 bool legal = false;
5220
5221 if (length > 0) {
5222 if (_major_version < JAVA_1_5_VERSION) {
5223 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5224 const char* p = skip_over_field_name(bytes, false, length);
5225 legal = (p != nullptr) && ((p - bytes) == (int)length);
5226 }
5227 } else {
5228 // 4881221: relax the constraints based on JSR202 spec
5229 legal = verify_unqualified_name(bytes, length, LegalField);
5230 }
5231 }
5232
5233 if (!legal) {
5234 ResourceMark rm(THREAD);
5235 assert(_class_name != nullptr, "invariant");
5236 Exceptions::fthrow(
5237 THREAD_AND_LOCATION,
5238 vmSymbols::java_lang_ClassFormatError(),
5239 "Illegal field name \"%.*s\" in class %s", length, bytes,
5240 _class_name->as_C_string()
5241 );
5242 return;
5243 }
5244 }
5245
5246 // Checks if name is a legal method name.
5247 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5248 if (!_need_verify || _relax_verify) { return; }
5249
5250 assert(name != nullptr, "method name is null");
5251 char* bytes = (char*)name->bytes();
5252 unsigned int length = name->utf8_length();
5253 bool legal = false;
5254
5255 if (length > 0) {
5256 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5257 if (name == vmSymbols::object_initializer_name() ||
5258 name == vmSymbols::class_initializer_name()) {
5259 legal = true;
5260 }
5261 } else if (_major_version < JAVA_1_5_VERSION) {
5262 const char* p;
5263 p = skip_over_field_name(bytes, false, length);
5264 legal = (p != nullptr) && ((p - bytes) == (int)length);
5265 } else {
5266 // 4881221: relax the constraints based on JSR202 spec
5267 legal = verify_unqualified_name(bytes, length, LegalMethod);
5268 }
5269 }
5270
5271 if (!legal) {
5272 ResourceMark rm(THREAD);
5273 assert(_class_name != nullptr, "invariant");
5274 Exceptions::fthrow(
5275 THREAD_AND_LOCATION,
5276 vmSymbols::java_lang_ClassFormatError(),
5277 "Illegal method name \"%.*s\" in class %s", length, bytes,
5278 _class_name->as_C_string()
5279 );
5280 return;
5281 }
5282 }
5283
5284
5285 // Checks if signature is a legal field signature.
5286 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5287 const Symbol* signature,
5288 TRAPS) const {
5289 if (!_need_verify) { return; }
5290
5291 const char* const bytes = (const char*)signature->bytes();
5292 const unsigned int length = signature->utf8_length();
5293 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5294
5295 if (p == nullptr || (p - bytes) != (int)length) {
5296 throwIllegalSignature("Field", name, signature, CHECK);
5297 }
5298 }
5299
5300 // Check that the signature is compatible with the method name. For example,
5301 // check that <init> has a void signature.
5302 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5303 const Symbol* signature,
5304 TRAPS) const {
5305 if (!_need_verify) {
5306 return;
5307 }
5308
5309 // Class initializers cannot have args for class format version >= 51.
5310 if (name == vmSymbols::class_initializer_name() &&
5311 signature != vmSymbols::void_method_signature() &&
5312 _major_version >= JAVA_7_VERSION) {
5313 throwIllegalSignature("Method", name, signature, THREAD);
5314 return;
5315 }
5316
5317 int sig_length = signature->utf8_length();
5318 if (name->utf8_length() > 0 &&
5319 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5320 sig_length > 0 &&
5321 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5322 throwIllegalSignature("Method", name, signature, THREAD);
5323 }
5324 }
5325
5326 // Checks if signature is a legal method signature.
5327 // Returns number of parameters
5328 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5329 const Symbol* signature,
5330 TRAPS) const {
5331 if (!_need_verify) {
5332 // make sure caller's args_size will be less than 0 even for non-static
5333 // method so it will be recomputed in compute_size_of_parameters().
5334 return -2;
5335 }
5336
5337 unsigned int args_size = 0;
5338 const char* p = (const char*)signature->bytes();
5339 unsigned int length = signature->utf8_length();
5340 const char* nextp;
5341
5342 // The first character must be a '('
5343 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5344 length--;
5345 // Skip over legal field signatures
5346 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5347 while ((length > 0) && (nextp != nullptr)) {
5348 args_size++;
5349 if (p[0] == 'J' || p[0] == 'D') {
5350 args_size++;
5351 }
5352 length -= pointer_delta_as_int(nextp, p);
5353 p = nextp;
5354 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5355 }
5356 // The first non-signature thing better be a ')'
5357 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5358 length--;
5359 // Now we better just have a return value
5360 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5361 if (nextp && ((int)length == (nextp - p))) {
5362 return args_size;
5363 }
5364 }
5365 }
5366 // Report error
5367 throwIllegalSignature("Method", name, signature, THREAD);
5368 return 0;
5369 }
5370
5371 int ClassFileParser::static_field_size() const {
5372 assert(_field_info != nullptr, "invariant");
5373 return _field_info->_static_field_size;
5374 }
5375
5376 int ClassFileParser::total_oop_map_count() const {
5377 assert(_field_info != nullptr, "invariant");
5378 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5379 }
5380
5381 jint ClassFileParser::layout_size() const {
5382 assert(_field_info != nullptr, "invariant");
5383 return _field_info->_instance_size;
5384 }
5385
5386 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5387 const Array<Method*>* methods) {
5388 assert(ik != nullptr, "invariant");
5389 assert(methods != nullptr, "invariant");
5390
5391 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5392 // (We used to do this lazily, but now we query it in Rewriter,
5393 // which is eagerly done for every method, so we might as well do it now,
5394 // when everything is fresh in memory.)
5395 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5396
5397 if (klass_id != vmSymbolID::NO_SID) {
5398 for (int j = 0; j < methods->length(); ++j) {
5399 Method* method = methods->at(j);
5400 method->init_intrinsic_id(klass_id);
5401
5402 if (CheckIntrinsics) {
5403 // Check if an intrinsic is defined for method 'method',
5404 // but the method is not annotated with @IntrinsicCandidate.
5405 if (method->intrinsic_id() != vmIntrinsics::_none &&
5406 !method->intrinsic_candidate()) {
5407 tty->print("Compiler intrinsic is defined for method [%s], "
5408 "but the method is not annotated with @IntrinsicCandidate.%s",
5409 method->name_and_sig_as_C_string(),
5410 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5411 );
5412 tty->cr();
5413 DEBUG_ONLY(vm_exit(1));
5414 }
5415 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5416 // but there is no intrinsic available for it.
5417 if (method->intrinsic_candidate() &&
5418 method->intrinsic_id() == vmIntrinsics::_none) {
5419 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5420 "but no compiler intrinsic is defined for the method.%s",
5421 method->name_and_sig_as_C_string(),
5422 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5423 );
5424 tty->cr();
5425 DEBUG_ONLY(vm_exit(1));
5426 }
5427 }
5428 } // end for
5429
5430 #ifdef ASSERT
5431 if (CheckIntrinsics) {
5432 // Check for orphan methods in the current class. A method m
5433 // of a class C is orphan if an intrinsic is defined for method m,
5434 // but class C does not declare m.
5435 // The check is potentially expensive, therefore it is available
5436 // only in debug builds.
5437
5438 for (auto id : EnumRange<vmIntrinsicID>{}) {
5439 if (vmIntrinsics::_compiledLambdaForm == id) {
5440 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5441 // generated for the JVM from a LambdaForm and therefore no method
5442 // is defined for it.
5443 continue;
5444 }
5445 if (vmIntrinsics::_blackhole == id) {
5446 // The _blackhole intrinsic is a special marker. No explicit method
5447 // is defined for it.
5448 continue;
5449 }
5450
5451 if (vmIntrinsics::class_for(id) == klass_id) {
5452 // Check if the current class contains a method with the same
5453 // name, flags, signature.
5454 bool match = false;
5455 for (int j = 0; j < methods->length(); ++j) {
5456 const Method* method = methods->at(j);
5457 if (method->intrinsic_id() == id) {
5458 match = true;
5459 break;
5460 }
5461 }
5462
5463 if (!match) {
5464 char buf[1000];
5465 tty->print("Compiler intrinsic is defined for method [%s], "
5466 "but the method is not available in class [%s].%s",
5467 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5468 ik->name()->as_C_string(),
5469 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5470 );
5471 tty->cr();
5472 DEBUG_ONLY(vm_exit(1));
5473 }
5474 }
5475 } // end for
5476 } // CheckIntrinsics
5477 #endif // ASSERT
5478 }
5479 }
5480
5481 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5482 const ClassInstanceInfo& cl_inst_info,
5483 TRAPS) {
5484 if (_klass != nullptr) {
5485 return _klass;
5486 }
5487
5488 InstanceKlass* const ik =
5489 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5490
5491 if (is_hidden()) {
5492 mangle_hidden_class_name(ik);
5493 }
5494
5495 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5496
5497 assert(_klass == ik, "invariant");
5498 return ik;
5499 }
5500
5501 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5502 bool changed_by_loadhook,
5503 const ClassInstanceInfo& cl_inst_info,
5504 TRAPS) {
5505 assert(ik != nullptr, "invariant");
5506
5507 // Set name and CLD before adding to CLD
5508 ik->set_class_loader_data(_loader_data);
5509 ik->set_name(_class_name);
5510
5511 // Add all classes to our internal class loader list here,
5512 // including classes in the bootstrap (null) class loader.
5513 const bool publicize = !is_internal();
5514
5515 _loader_data->add_class(ik, publicize);
5516
5517 set_klass_to_deallocate(ik);
5518
5519 assert(_field_info != nullptr, "invariant");
5520 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5521 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5522 "sanity");
5523
5524 assert(ik->is_instance_klass(), "sanity");
5525 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5526
5527 // Fill in information already parsed
5528 ik->set_should_verify_class(_need_verify);
5529
5530 // Not yet: supers are done below to support the new subtype-checking fields
5531 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5532 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5533 if (_field_info->_is_naturally_atomic && ik->is_inline_klass()) {
5534 ik->set_is_naturally_atomic();
5535 }
5536
5537 assert(_fac != nullptr, "invariant");
5538 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_INLINE]);
5539
5540 // this transfers ownership of a lot of arrays from
5541 // the parser onto the InstanceKlass*
5542 apply_parsed_class_metadata(ik, _java_fields_count);
5543 if (ik->is_inline_klass()) {
5544 InlineKlass::cast(ik)->init_fixed_block();
5545 }
5546
5547 // can only set dynamic nest-host after static nest information is set
5548 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5549 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5550 }
5551
5552 // note that is not safe to use the fields in the parser from this point on
5553 assert(nullptr == _cp, "invariant");
5554 assert(nullptr == _fieldinfo_stream, "invariant");
5555 assert(nullptr == _fields_status, "invariant");
5556 assert(nullptr == _methods, "invariant");
5557 assert(nullptr == _inner_classes, "invariant");
5558 assert(nullptr == _nest_members, "invariant");
5559 assert(nullptr == _preload_classes, "invariant");
5560 assert(nullptr == _combined_annotations, "invariant");
5561 assert(nullptr == _record_components, "invariant");
5562 assert(nullptr == _permitted_subclasses, "invariant");
5563 assert(nullptr == _inline_type_field_klasses, "invariant");
5564
5565 if (_has_localvariable_table) {
5566 ik->set_has_localvariable_table(true);
5567 }
5568
5569 if (_has_final_method) {
5570 ik->set_has_final_method();
5571 }
5572
5573 ik->copy_method_ordering(_method_ordering, CHECK);
5574 // The InstanceKlass::_methods_jmethod_ids cache
5575 // is managed on the assumption that the initial cache
5576 // size is equal to the number of methods in the class. If
5577 // that changes, then InstanceKlass::idnum_can_increment()
5578 // has to be changed accordingly.
5579 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5580
5581 ik->set_this_class_index(_this_class_index);
5582
5583 if (_is_hidden) {
5584 // _this_class_index is a CONSTANT_Class entry that refers to this
5585 // hidden class itself. If this class needs to refer to its own methods
5586 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5587 // _this_class_index. However, because this class is hidden (it's
5588 // not stored in SystemDictionary), _this_class_index cannot be resolved
5589 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5590 // Therefore, we must eagerly resolve _this_class_index now.
5591 ik->constants()->klass_at_put(_this_class_index, ik);
5592 }
5593
5594 ik->set_minor_version(_minor_version);
5595 ik->set_major_version(_major_version);
5596 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5597 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5598
5599 if (_must_be_atomic) {
5600 ik->set_must_be_atomic();
5601 }
5602 if (_is_implicitly_constructible) {
5603 ik->set_is_implicitly_constructible();
5604 }
5605 if (_is_hidden) {
5606 ik->set_is_hidden();
5607 }
5608
5609 // Set PackageEntry for this_klass
5610 oop cl = ik->class_loader();
5611 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5612 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5613 ik->set_package(cld, nullptr, CHECK);
5614
5615 const Array<Method*>* const methods = ik->methods();
5616 assert(methods != nullptr, "invariant");
5617 const int methods_len = methods->length();
5618
5619 check_methods_for_intrinsics(ik, methods);
5620
5621 // Fill in field values obtained by parse_classfile_attributes
5622 if (_parsed_annotations->has_any_annotations()) {
5623 _parsed_annotations->apply_to(ik);
5624 }
5625
5626 apply_parsed_class_attributes(ik);
5627
5628 // Miranda methods
5629 if ((_num_miranda_methods > 0) ||
5630 // if this class introduced new miranda methods or
5631 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5632 // super class exists and this class inherited miranda methods
5633 ) {
5634 ik->set_has_miranda_methods(); // then set a flag
5635 }
5636
5637 // Fill in information needed to compute superclasses.
5638 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5639 ik->set_transitive_interfaces(_transitive_interfaces);
5640 ik->set_local_interfaces(_local_interfaces);
5641 _transitive_interfaces = nullptr;
5642 _local_interfaces = nullptr;
5643
5644 // Initialize itable offset tables
5645 klassItable::setup_itable_offset_table(ik);
5646
5647 // Compute transitive closure of interfaces this class implements
5648 // Do final class setup
5649 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5650 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5651 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5652 }
5653
5654 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5655 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5656 ik->set_has_contended_annotations(true);
5657 }
5658
5659 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5660 set_precomputed_flags(ik);
5661
5662 // check if this class can access its super class
5663 check_super_class_access(ik, CHECK);
5664
5665 // check if this class can access its superinterfaces
5666 check_super_interface_access(ik, CHECK);
5667
5668 // check if this class overrides any final method
5669 check_final_method_override(ik, CHECK);
5670
5671 // reject static interface methods prior to Java 8
5672 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5673 check_illegal_static_method(ik, CHECK);
5674 }
5675
5676 // Obtain this_klass' module entry
5677 ModuleEntry* module_entry = ik->module();
5678 assert(module_entry != nullptr, "module_entry should always be set");
5679
5680 // Obtain java.lang.Module
5681 Handle module_handle(THREAD, module_entry->module());
5682
5683 // Allocate mirror and initialize static fields
5684 // The create_mirror() call will also call compute_modifiers()
5685 java_lang_Class::create_mirror(ik,
5686 Handle(THREAD, _loader_data->class_loader()),
5687 module_handle,
5688 _protection_domain,
5689 cl_inst_info.class_data(),
5690 CHECK);
5691
5692 assert(_all_mirandas != nullptr, "invariant");
5693
5694 // Generate any default methods - default methods are public interface methods
5695 // that have a default implementation. This is new with Java 8.
5696 if (_has_nonstatic_concrete_methods) {
5697 DefaultMethods::generate_default_methods(ik,
5698 _all_mirandas,
5699 CHECK);
5700 }
5701
5702 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5703 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5704 !module_entry->has_default_read_edges()) {
5705 if (!module_entry->set_has_default_read_edges()) {
5706 // We won a potential race
5707 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5708 }
5709 }
5710
5711 bool all_fields_empty = true;
5712 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
5713 if (!fs.access_flags().is_static()) {
5714 if (fs.field_descriptor().is_null_free_inline_type()) {
5715 Klass* k = ik->inline_type_field_klasses_array()->at(fs.index());
5716 assert(k->is_inline_klass(), "must be");
5717 if (!InlineKlass::cast(k)->is_empty_inline_type()) { all_fields_empty = false; }
5718 } else {
5719 all_fields_empty = false;
5720 }
5721 } else if (is_inline_type() && (fs.name() == vmSymbols::default_value_name())) {
5722 InlineKlass::cast(ik)->set_default_value_offset(ik->field_offset(fs.index()));
5723 }
5724 }
5725
5726 if (_is_empty_inline_type || (is_inline_type() && all_fields_empty)) {
5727 ik->set_is_empty_inline_type();
5728 }
5729
5730 if (is_inline_type()) {
5731 InlineKlass* vk = InlineKlass::cast(ik);
5732 vk->set_alignment(_alignment);
5733 vk->set_first_field_offset(_first_field_offset);
5734 vk->set_exact_size_in_bytes(_exact_size_in_bytes);
5735 InlineKlass::cast(ik)->initialize_calling_convention(CHECK);
5736 }
5737
5738 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5739
5740 if (!is_internal()) {
5741 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5742
5743 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5744 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5745 log_is_enabled(Info, class, preview)) {
5746 ResourceMark rm;
5747 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5748 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5749 }
5750
5751 if (log_is_enabled(Debug, class, resolve)) {
5752 ResourceMark rm;
5753 // print out the superclass.
5754 const char * from = ik->external_name();
5755 if (ik->java_super() != nullptr) {
5756 log_debug(class, resolve)("%s %s (super)",
5757 from,
5758 ik->java_super()->external_name());
5759 }
5760 // print out each of the interface classes referred to by this class.
5761 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5762 if (local_interfaces != nullptr) {
5763 const int length = local_interfaces->length();
5764 for (int i = 0; i < length; i++) {
5765 const InstanceKlass* const k = local_interfaces->at(i);
5766 const char * to = k->external_name();
5767 log_debug(class, resolve)("%s %s (interface)", from, to);
5768 }
5769 }
5770 }
5771 }
5772
5773 JFR_ONLY(INIT_ID(ik);)
5774
5775 // If we reach here, all is well.
5776 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5777 // in order for it to not be destroyed in the ClassFileParser destructor.
5778 set_klass_to_deallocate(nullptr);
5779
5780 // it's official
5781 set_klass(ik);
5782
5783 debug_only(ik->verify();)
5784 }
5785
5786 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5787 // Decrement the refcount in the old name, since we're clobbering it.
5788 _class_name->decrement_refcount();
5789
5790 _class_name = new_class_name;
5791 // Increment the refcount of the new name.
5792 // Now the ClassFileParser owns this name and will decrement in
5793 // the destructor.
5794 _class_name->increment_refcount();
5795 }
5796
5797 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5798 bool trusted = loader_data->is_boot_class_loader_data() ||
5799 loader_data->is_platform_class_loader_data();
5800 bool need_verify =
5801 // verifyAll
5802 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5803 // verifyRemote
5804 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5805 return !need_verify;
5806 }
5807
5808 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5809 Symbol* name,
5810 ClassLoaderData* loader_data,
5811 const ClassLoadInfo* cl_info,
5812 Publicity pub_level,
5813 TRAPS) :
5814 _stream(stream),
5815 _class_name(nullptr),
5816 _loader_data(loader_data),
5817 _is_hidden(cl_info->is_hidden()),
5818 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5819 _orig_cp_size(0),
5820 _super_klass(),
5821 _cp(nullptr),
5822 _fieldinfo_stream(nullptr),
5823 _fields_status(nullptr),
5824 _methods(nullptr),
5825 _inner_classes(nullptr),
5826 _nest_members(nullptr),
5827 _nest_host(0),
5828 _permitted_subclasses(nullptr),
5829 _preload_classes(nullptr),
5830 _record_components(nullptr),
5831 _local_interfaces(nullptr),
5832 _local_interface_indexes(nullptr),
5833 _transitive_interfaces(nullptr),
5834 _combined_annotations(nullptr),
5835 _class_annotations(nullptr),
5836 _class_type_annotations(nullptr),
5837 _fields_annotations(nullptr),
5838 _fields_type_annotations(nullptr),
5839 _klass(nullptr),
5840 _klass_to_deallocate(nullptr),
5841 _parsed_annotations(nullptr),
5842 _fac(nullptr),
5843 _field_info(nullptr),
5844 _inline_type_field_klasses(nullptr),
5845 _temp_field_info(nullptr),
5846 _method_ordering(nullptr),
5847 _all_mirandas(nullptr),
5848 _vtable_size(0),
5849 _itable_size(0),
5850 _num_miranda_methods(0),
5851 _protection_domain(cl_info->protection_domain()),
5852 _access_flags(),
5853 _pub_level(pub_level),
5854 _bad_constant_seen(0),
5855 _synthetic_flag(false),
5856 _sde_length(false),
5857 _sde_buffer(nullptr),
5858 _sourcefile_index(0),
5859 _generic_signature_index(0),
5860 _major_version(0),
5861 _minor_version(0),
5862 _this_class_index(0),
5863 _super_class_index(0),
5864 _itfs_len(0),
5865 _java_fields_count(0),
5866 _need_verify(false),
5867 _relax_verify(false),
5868 _has_nonstatic_concrete_methods(false),
5869 _declares_nonstatic_concrete_methods(false),
5870 _has_localvariable_table(false),
5871 _has_final_method(false),
5872 _has_contended_fields(false),
5873 _has_inline_type_fields(false),
5874 _has_nonstatic_fields(false),
5875 _is_empty_inline_type(false),
5876 _is_naturally_atomic(false),
5877 _must_be_atomic(true),
5878 _is_implicitly_constructible(false),
5879 _has_loosely_consistent_annotation(false),
5880 _has_implicitly_constructible_annotation(false),
5881 _has_finalizer(false),
5882 _has_empty_finalizer(false),
5883 _has_vanilla_constructor(false),
5884 _max_bootstrap_specifier_index(-1) {
5885
5886 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5887 _class_name->increment_refcount();
5888
5889 assert(_loader_data != nullptr, "invariant");
5890 assert(stream != nullptr, "invariant");
5891 assert(_stream != nullptr, "invariant");
5892 assert(_stream->buffer() == _stream->current(), "invariant");
5893 assert(_class_name != nullptr, "invariant");
5894 assert(0 == _access_flags.as_int(), "invariant");
5895
5896 // Figure out whether we can skip format checking (matching classic VM behavior)
5897 if (CDSConfig::is_dumping_static_archive()) {
5898 // verify == true means it's a 'remote' class (i.e., non-boot class)
5899 // Verification decision is based on BytecodeVerificationRemote flag
5900 // for those classes.
5901 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5902 BytecodeVerificationLocal;
5903 }
5904 else {
5905 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5906 stream->need_verify());
5907 }
5908
5909 // synch back verification state to stream
5910 stream->set_verify(_need_verify);
5911
5912 // Check if verification needs to be relaxed for this class file
5913 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5914 _relax_verify = relax_format_check_for(_loader_data);
5915
5916 parse_stream(stream, CHECK);
5917
5918 post_process_parsed_stream(stream, _cp, CHECK);
5919 }
5920
5921 void ClassFileParser::clear_class_metadata() {
5922 // metadata created before the instance klass is created. Must be
5923 // deallocated if classfile parsing returns an error.
5924 _cp = nullptr;
5925 _fieldinfo_stream = nullptr;
5926 _fields_status = nullptr;
5927 _methods = nullptr;
5928 _inner_classes = nullptr;
5929 _nest_members = nullptr;
5930 _permitted_subclasses = nullptr;
5931 _preload_classes = nullptr;
5932 _combined_annotations = nullptr;
5933 _class_annotations = _class_type_annotations = nullptr;
5934 _fields_annotations = _fields_type_annotations = nullptr;
5935 _record_components = nullptr;
5936 _inline_type_field_klasses = nullptr;
5937 }
5938
5939 // Destructor to clean up
5940 ClassFileParser::~ClassFileParser() {
5941 _class_name->decrement_refcount();
5942
5943 if (_cp != nullptr) {
5944 MetadataFactory::free_metadata(_loader_data, _cp);
5945 }
5946
5947 if (_fieldinfo_stream != nullptr) {
5948 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5949 }
5950
5951 if (_fields_status != nullptr) {
5952 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5953 }
5954
5955 if (_inline_type_field_klasses != nullptr) {
5956 MetadataFactory::free_array<InlineKlass*>(_loader_data, _inline_type_field_klasses);
5957 }
5958
5959 if (_methods != nullptr) {
5960 // Free methods
5961 InstanceKlass::deallocate_methods(_loader_data, _methods);
5962 }
5963
5964 // beware of the Universe::empty_blah_array!!
5965 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5966 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5967 }
5968
5969 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5970 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5971 }
5972
5973 if (_record_components != nullptr) {
5974 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5975 }
5976
5977 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5978 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5979 }
5980
5981 if (_preload_classes != nullptr && _preload_classes != Universe::the_empty_short_array()) {
5982 MetadataFactory::free_array<u2>(_loader_data, _preload_classes);
5983 }
5984
5985 // Free interfaces
5986 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5987 _local_interfaces, _transitive_interfaces);
5988
5989 if (_combined_annotations != nullptr) {
5990 // After all annotations arrays have been created, they are installed into the
5991 // Annotations object that will be assigned to the InstanceKlass being created.
5992
5993 // Deallocate the Annotations object and the installed annotations arrays.
5994 _combined_annotations->deallocate_contents(_loader_data);
5995
5996 // If the _combined_annotations pointer is non-null,
5997 // then the other annotations fields should have been cleared.
5998 assert(_class_annotations == nullptr, "Should have been cleared");
5999 assert(_class_type_annotations == nullptr, "Should have been cleared");
6000 assert(_fields_annotations == nullptr, "Should have been cleared");
6001 assert(_fields_type_annotations == nullptr, "Should have been cleared");
6002 } else {
6003 // If the annotations arrays were not installed into the Annotations object,
6004 // then they have to be deallocated explicitly.
6005 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6006 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6007 Annotations::free_contents(_loader_data, _fields_annotations);
6008 Annotations::free_contents(_loader_data, _fields_type_annotations);
6009 }
6010
6011 clear_class_metadata();
6012 _transitive_interfaces = nullptr;
6013 _local_interfaces = nullptr;
6014
6015 // deallocate the klass if already created. Don't directly deallocate, but add
6016 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6017 // at a safepoint.
6018 if (_klass_to_deallocate != nullptr) {
6019 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6020 }
6021 }
6022
6023 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6024 TRAPS) {
6025
6026 assert(stream != nullptr, "invariant");
6027 assert(_class_name != nullptr, "invariant");
6028
6029 // BEGIN STREAM PARSING
6030 stream->guarantee_more(8, CHECK); // magic, major, minor
6031 // Magic value
6032 const u4 magic = stream->get_u4_fast();
6033 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6034 "Incompatible magic value %u in class file %s",
6035 magic, CHECK);
6036
6037 // Version numbers
6038 _minor_version = stream->get_u2_fast();
6039 _major_version = stream->get_u2_fast();
6040
6041 // Check version numbers - we check this even with verifier off
6042 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6043
6044 stream->guarantee_more(3, CHECK); // length, first cp tag
6045 u2 cp_size = stream->get_u2_fast();
6046
6047 guarantee_property(
6048 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6049 cp_size, CHECK);
6050
6051 _orig_cp_size = cp_size;
6052 if (is_hidden()) { // Add a slot for hidden class name.
6053 cp_size++;
6054 }
6055
6056 _cp = ConstantPool::allocate(_loader_data,
6057 cp_size,
6058 CHECK);
6059
6060 ConstantPool* const cp = _cp;
6061
6062 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6063
6064 assert(cp_size == (u2)cp->length(), "invariant");
6065
6066 // ACCESS FLAGS
6067 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6068
6069 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6070 // JVM_ACC_MODULE is defined in JDK-9 and later.
6071 if (_major_version >= JAVA_9_VERSION) {
6072 recognized_modifiers |= JVM_ACC_MODULE;
6073 }
6074
6075 // Access flags
6076 jint flags = stream->get_u2_fast() & recognized_modifiers;
6077
6078 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6079 // Set abstract bit for old class files for backward compatibility
6080 flags |= JVM_ACC_ABSTRACT;
6081 }
6082
6083 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
6084 if (!supports_inline_types()) {
6085 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6086 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6087 if (!is_module && !is_interface) {
6088 flags |= JVM_ACC_IDENTITY;
6089 }
6090 }
6091
6092
6093 // This class and superclass
6094 _this_class_index = stream->get_u2_fast();
6095 check_property(
6096 valid_cp_range(_this_class_index, cp_size) &&
6097 cp->tag_at(_this_class_index).is_unresolved_klass(),
6098 "Invalid this class index %u in constant pool in class file %s",
6099 _this_class_index, CHECK);
6100
6101 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6102 assert(class_name_in_cp != nullptr, "class_name can't be null");
6103
6104 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
6105
6106 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
6107
6108 _access_flags.set_flags(flags);
6109
6110 short bad_constant = class_bad_constant_seen();
6111 if (bad_constant != 0) {
6112 // Do not throw CFE until after the access_flags are checked because if
6113 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6114 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6115 return;
6116 }
6117
6118 // Don't need to check whether this class name is legal or not.
6119 // It has been checked when constant pool is parsed.
6120 // However, make sure it is not an array type.
6121 if (_need_verify) {
6122 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6123 "Bad class name in class file %s",
6124 CHECK);
6125 }
6126
6127 #ifdef ASSERT
6128 // Basic sanity checks
6129 if (_is_hidden) {
6130 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6131 }
6132 #endif
6133
6134 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
6135
6136 if (_is_hidden) {
6137 assert(_class_name != nullptr, "Unexpected null _class_name");
6138 #ifdef ASSERT
6139 if (_need_verify) {
6140 verify_legal_class_name(_class_name, CHECK);
6141 }
6142 #endif
6143
6144 } else {
6145 // Check if name in class file matches given name
6146 if (_class_name != class_name_in_cp) {
6147 if (_class_name != vmSymbols::unknown_class_name()) {
6148 ResourceMark rm(THREAD);
6149 Exceptions::fthrow(THREAD_AND_LOCATION,
6150 vmSymbols::java_lang_NoClassDefFoundError(),
6151 "%s (wrong name: %s)",
6152 _class_name->as_C_string(),
6153 class_name_in_cp->as_C_string()
6154 );
6155 return;
6156 } else {
6157 // The class name was not known by the caller so we set it from
6158 // the value in the CP.
6159 update_class_name(class_name_in_cp);
6160 }
6161 // else nothing to do: the expected class name matches what is in the CP
6162 }
6163 }
6164
6165 // Verification prevents us from creating names with dots in them, this
6166 // asserts that that's the case.
6167 assert(is_internal_format(_class_name), "external class name format used internally");
6168
6169 if (!is_internal()) {
6170 LogTarget(Debug, class, preorder) lt;
6171 if (lt.is_enabled()){
6172 ResourceMark rm(THREAD);
6173 LogStream ls(lt);
6174 ls.print("%s", _class_name->as_klass_external_name());
6175 if (stream->source() != nullptr) {
6176 ls.print(" source: %s", stream->source());
6177 }
6178 ls.cr();
6179 }
6180 }
6181
6182 // SUPERKLASS
6183 _super_class_index = stream->get_u2_fast();
6184 _super_klass = parse_super_class(cp,
6185 _super_class_index,
6186 _need_verify,
6187 CHECK);
6188
6189 // Interfaces
6190 _itfs_len = stream->get_u2_fast();
6191 parse_interfaces(stream,
6192 _itfs_len,
6193 cp,
6194 &_has_nonstatic_concrete_methods,
6195 CHECK);
6196
6197 // Fields (offsets are filled in later)
6198 _fac = new FieldAllocationCount();
6199 parse_fields(stream,
6200 _access_flags,
6201 _fac,
6202 cp,
6203 cp_size,
6204 &_java_fields_count,
6205 CHECK);
6206
6207 assert(_temp_field_info != nullptr, "invariant");
6208
6209 // Methods
6210 parse_methods(stream,
6211 is_interface(),
6212 !is_identity_class(),
6213 is_abstract_class(),
6214 &_has_localvariable_table,
6215 &_has_final_method,
6216 &_declares_nonstatic_concrete_methods,
6217 CHECK);
6218
6219 assert(_methods != nullptr, "invariant");
6220
6221 if (_declares_nonstatic_concrete_methods) {
6222 _has_nonstatic_concrete_methods = true;
6223 }
6224
6225 // Additional attributes/annotations
6226 _parsed_annotations = new ClassAnnotationCollector();
6227 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6228
6229 assert(_inner_classes != nullptr, "invariant");
6230
6231 // Finalize the Annotations metadata object,
6232 // now that all annotation arrays have been created.
6233 create_combined_annotations(CHECK);
6234
6235 // Make sure this is the end of class file stream
6236 guarantee_property(stream->at_eos(),
6237 "Extra bytes at the end of class file %s",
6238 CHECK);
6239
6240 // all bytes in stream read and parsed
6241 }
6242
6243 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6244 ResourceMark rm;
6245 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6246 // use a '/' because that confuses finding the class's package. Also, can't
6247 // use an illegal char such as ';' because that causes serialization issues
6248 // and issues with hidden classes that create their own hidden classes.
6249 char addr_buf[20];
6250 if (CDSConfig::is_dumping_static_archive()) {
6251 // We want stable names for the archived hidden classes (only for static
6252 // archive for now). Spaces under default_SharedBaseAddress() will be
6253 // occupied by the archive at run time, so we know that no dynamically
6254 // loaded InstanceKlass will be placed under there.
6255 static volatile size_t counter = 0;
6256 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6257 size_t new_id = Atomic::add(&counter, (size_t)1);
6258 jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
6259 } else {
6260 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6261 }
6262 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6263 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6264 jio_snprintf(new_name, new_name_len, "%s+%s",
6265 _class_name->as_C_string(), addr_buf);
6266 update_class_name(SymbolTable::new_symbol(new_name));
6267
6268 // Add a Utf8 entry containing the hidden name.
6269 assert(_class_name != nullptr, "Unexpected null _class_name");
6270 int hidden_index = _orig_cp_size; // this is an extra slot we added
6271 _cp->symbol_at_put(hidden_index, _class_name);
6272
6273 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6274 // We have to update the resolved_klass_index and the name_index together
6275 // so extract the existing resolved_klass_index first.
6276 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6277 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6278 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6279 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6280 "Bad name_index");
6281 }
6282
6283 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6284 ConstantPool* cp,
6285 TRAPS) {
6286 assert(stream != nullptr, "invariant");
6287 assert(stream->at_eos(), "invariant");
6288 assert(cp != nullptr, "invariant");
6289 assert(_loader_data != nullptr, "invariant");
6290
6291 if (_class_name == vmSymbols::java_lang_Object()) {
6292 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6293 "java.lang.Object cannot implement an interface in class file %s",
6294 CHECK);
6295 }
6296 // We check super class after class file is parsed and format is checked
6297 if (_super_class_index > 0 && nullptr == _super_klass) {
6298 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6299 if (is_interface()) {
6300 // Before attempting to resolve the superclass, check for class format
6301 // errors not checked yet.
6302 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6303 "Interfaces must have java.lang.Object as superclass in class file %s",
6304 CHECK);
6305 }
6306 Handle loader(THREAD, _loader_data->class_loader());
6307 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6308 _super_klass = vmClasses::Object_klass();
6309 } else {
6310 _super_klass = (const InstanceKlass*)
6311 SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6312 super_class_name,
6313 loader,
6314 _protection_domain,
6315 true,
6316 CHECK);
6317 }
6318 }
6319
6320 if (_super_klass != nullptr) {
6321 if (_super_klass->is_interface()) {
6322 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6323 return;
6324 }
6325
6326 if (EnableValhalla) {
6327 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6328 }
6329
6330 if (_super_klass->has_nonstatic_concrete_methods()) {
6331 _has_nonstatic_concrete_methods = true;
6332 }
6333
6334 if (EnableValhalla && !_access_flags.is_identity_class()) {
6335 const InstanceKlass* k = _super_klass;
6336 int inherited_instance_fields = 0;
6337 while (k != nullptr) {
6338 for (AllFieldStream fs(k); !fs.done(); fs.next()) {
6339 if (!fs.access_flags().is_static()) inherited_instance_fields++;
6340 }
6341 k = k->super() == nullptr ? nullptr : InstanceKlass::cast(k->super());
6342 }
6343 if (inherited_instance_fields > 0) {
6344 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), "Value classes don't support inherited non-static fields yet");
6345 }
6346 }
6347 }
6348
6349 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6350 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6351 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6352 _class_name->as_klass_external_name()));
6353 }
6354 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_ImplicitlyConstructible) && _access_flags.is_identity_class()) {
6355 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6356 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.ImplicitlyConstructible, because it is not a value class",
6357 _class_name->as_klass_external_name()));
6358 }
6359
6360 // Determining is the class allows tearing or not (default is not)
6361 // Test might need extensions when field inheritance is added for value classes
6362 if (EnableValhalla && !_access_flags.is_identity_class()) {
6363 if (_super_klass != nullptr // not j.l.Object
6364 && _parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6365 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6366 _must_be_atomic = false;
6367 }
6368 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_ImplicitlyConstructible)) {
6369 _is_implicitly_constructible = true;
6370 }
6371 // Apply VM options override
6372 if (*ForceNonTearable != '\0') {
6373 // Allow a command line switch to force the same atomicity property:
6374 const char* class_name_str = _class_name->as_C_string();
6375 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6376 _must_be_atomic = true;
6377 }
6378 }
6379 }
6380
6381 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6382 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6383 if (_local_interface_indexes != nullptr) {
6384 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6385 u2 interface_index = _local_interface_indexes->at(i);
6386 Klass* interf;
6387 if (cp->tag_at(interface_index).is_klass()) {
6388 interf = cp->resolved_klass_at(interface_index);
6389 } else {
6390 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6391
6392 // Don't need to check legal name because it's checked when parsing constant pool.
6393 // But need to make sure it's not an array type.
6394 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6395 "Bad interface name in class file %s", CHECK);
6396
6397 // Call resolve_super so class circularity is checked
6398 interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6399 _class_name,
6400 unresolved_klass,
6401 Handle(THREAD, _loader_data->class_loader()),
6402 _protection_domain,
6403 false,
6404 CHECK);
6405 }
6406
6407 if (!interf->is_interface()) {
6408 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6409 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6410 _class_name->as_klass_external_name(),
6411 interf->external_name(),
6412 interf->class_in_module_of_loader()));
6413 }
6414
6415 if (EnableValhalla) {
6416 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6417 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6418 }
6419
6420 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6421 _has_nonstatic_concrete_methods = true;
6422 }
6423 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6424 }
6425 }
6426 assert(_local_interfaces != nullptr, "invariant");
6427
6428 // Compute the transitive list of all unique interfaces implemented by this class
6429 _transitive_interfaces =
6430 compute_transitive_interfaces(_super_klass,
6431 _local_interfaces,
6432 _loader_data,
6433 CHECK);
6434
6435 assert(_transitive_interfaces != nullptr, "invariant");
6436
6437 // sort methods
6438 _method_ordering = sort_methods(_methods);
6439
6440 _all_mirandas = new GrowableArray<Method*>(20);
6441
6442 Handle loader(THREAD, _loader_data->class_loader());
6443 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6444 &_num_miranda_methods,
6445 _all_mirandas,
6446 _super_klass,
6447 _methods,
6448 _access_flags,
6449 _major_version,
6450 loader,
6451 _class_name,
6452 _local_interfaces);
6453
6454 // Size of Java itable (in words)
6455 _itable_size = is_interface() ? 0 :
6456 klassItable::compute_itable_size(_transitive_interfaces);
6457
6458 assert(_fac != nullptr, "invariant");
6459 assert(_parsed_annotations != nullptr, "invariant");
6460
6461 if (EnableValhalla) {
6462 _inline_type_field_klasses = MetadataFactory::new_array<InlineKlass*>(_loader_data,
6463 java_fields_count(),
6464 nullptr,
6465 CHECK);
6466 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6467 FieldInfo fieldinfo = *it;
6468 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6469 Symbol* sig = fieldinfo.signature(cp);
6470 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6471 // Pre-load classes of null-free fields that are candidate for flattening
6472 TempNewSymbol s = Signature::strip_envelope(sig);
6473 if (s == _class_name) {
6474 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()));
6475 }
6476 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());
6477 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s, Handle(THREAD, _loader_data->class_loader()), _protection_domain, false, THREAD);
6478 if (HAS_PENDING_EXCEPTION) {
6479 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) failed: %s",
6480 s->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6481 return; // Exception is still pending
6482 }
6483 assert(klass != nullptr, "Sanity check");
6484 if (klass->access_flags().is_identity_class()) {
6485 ResourceMark rm(THREAD);
6486 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6487 err_msg("Class %s expects class %s to be a value class, but it is an identity class",
6488 _class_name->as_C_string(),
6489 InstanceKlass::cast(klass)->external_name()));
6490 }
6491 if (klass->is_abstract()) {
6492 assert(klass->is_instance_klass(), "Sanity check");
6493 ResourceMark rm(THREAD);
6494 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6495 err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
6496 _class_name->as_C_string(),
6497 InstanceKlass::cast(klass)->external_name()));
6498 }
6499 InlineKlass* vk = InlineKlass::cast(klass);
6500 if (!vk->is_implicitly_constructible()) {
6501 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6502 err_msg("class %s is not implicitly constructible and it is used in a null restricted non-static field (not supported)",
6503 klass->name()->as_C_string()));
6504 }
6505 _inline_type_field_klasses->at_put(fieldinfo.index(), vk);
6506 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());
6507 } else if (Signature::has_envelope(sig)) {
6508 // Preloading classes for nullable fields that are listed in the Preload attribute
6509 // Those classes would be required later for the flattening of nullable inline type fields
6510 TempNewSymbol name = Signature::strip_envelope(sig);
6511 if (name != _class_name && is_class_in_preload_attribute(name)) {
6512 log_info(class, preload)("Preloading class %s during loading of class %s. Cause: field type in Preload attribute", name->as_C_string(), _class_name->as_C_string());
6513 oop loader = loader_data()->class_loader();
6514 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name, Handle(THREAD, loader), _protection_domain, false, THREAD);
6515 if (klass != nullptr) {
6516 if (klass->is_inline_klass()) {
6517 _inline_type_field_klasses->at_put(fieldinfo.index(), InlineKlass::cast(klass));
6518 log_info(class, preload)("Preloading of class %s during loading of class %s (cause: field type in Preload attribute) succeeded", name->as_C_string(), _class_name->as_C_string());
6519 } else {
6520 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6521 log_warning(class, preload)("Preloading class %s during loading of class %s (cause: field type in Preload attribute) but loaded class is not a value class", name->as_C_string(), _class_name->as_C_string());
6522 }
6523 } else {
6524 log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: field type in Preload attribute) failed : %s",
6525 name->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6526 }
6527 // Loads triggered by the preload attribute are speculative, failures must not impact loading of current class
6528 if (HAS_PENDING_EXCEPTION) {
6529 CLEAR_PENDING_EXCEPTION;
6530 }
6531 }
6532 }
6533 }
6534 }
6535
6536 _field_info = new FieldLayoutInfo();
6537 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6538 _parsed_annotations->is_contended(), is_inline_type(),
6539 _field_info, _inline_type_field_klasses);
6540 lb.build_layout(CHECK);
6541 if (is_inline_type()) {
6542 _alignment = lb.get_alignment();
6543 _first_field_offset = lb.get_first_field_offset();
6544 _exact_size_in_bytes = lb.get_exact_size_in_byte();
6545 }
6546 _has_inline_type_fields = _field_info->_has_inline_fields;
6547
6548 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6549 _fieldinfo_stream =
6550 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6551 injected_fields_count, loader_data(), CHECK);
6552 _fields_status =
6553 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6554 FieldStatus(0), CHECK);
6555 }
6556
6557 void ClassFileParser::set_klass(InstanceKlass* klass) {
6558
6559 #ifdef ASSERT
6560 if (klass != nullptr) {
6561 assert(nullptr == _klass, "leaking?");
6562 }
6563 #endif
6564
6565 _klass = klass;
6566 }
6567
6568 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6569
6570 #ifdef ASSERT
6571 if (klass != nullptr) {
6572 assert(nullptr == _klass_to_deallocate, "leaking?");
6573 }
6574 #endif
6575
6576 _klass_to_deallocate = klass;
6577 }
6578
6579 // Caller responsible for ResourceMark
6580 // clone stream with rewound position
6581 const ClassFileStream* ClassFileParser::clone_stream() const {
6582 assert(_stream != nullptr, "invariant");
6583
6584 return _stream->clone();
6585 }
6586
6587 ReferenceType ClassFileParser::super_reference_type() const {
6588 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6589 }
6590
6591 bool ClassFileParser::is_instance_ref_klass() const {
6592 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6593 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6594 // klass requiring special treatment in ref-processing. The abstract
6595 // j.l.r.Reference cannot be instantiated so doesn't partake in
6596 // ref-processing.
6597 return is_java_lang_ref_Reference_subclass();
6598 }
6599
6600 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6601 if (_super_klass == nullptr) {
6602 return false;
6603 }
6604
6605 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6606 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6607 return true;
6608 }
6609
6610 return _super_klass->reference_type() != REF_NONE;
6611 }
6612
6613 // ----------------------------------------------------------------------------
6614 // debugging
6615
6616 #ifdef ASSERT
6617
6618 // return true if class_name contains no '.' (internal format is '/')
6619 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6620 if (class_name != nullptr) {
6621 ResourceMark rm;
6622 char* name = class_name->as_C_string();
6623 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6624 } else {
6625 return true;
6626 }
6627 }
6628
6629 #endif