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 "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoadInfo.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/inlineKlass.inline.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/klassVtable.hpp"
60 #include "oops/metadata.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiThreadState.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/fieldDescriptor.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/safepointVerifiers.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/timer.hpp"
77 #include "services/classLoadingService.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/bitMap.inline.hpp"
81 #include "utilities/copy.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/exceptions.hpp"
84 #include "utilities/globalDefinitions.hpp"
85 #include "utilities/growableArray.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/ostream.hpp"
88 #include "utilities/resourceHash.hpp"
89 #include "utilities/stringUtils.hpp"
90 #include "utilities/utf8.hpp"
91 #if INCLUDE_CDS
92 #include "classfile/systemDictionaryShared.hpp"
93 #endif
94 #if INCLUDE_JFR
95 #include "jfr/support/jfrTraceIdExtension.hpp"
96 #endif
97
98 // We generally try to create the oops directly when parsing, rather than
99 // allocating temporary data structures and copying the bytes twice. A
100 // temporary area is only needed when parsing utf8 entries in the constant
101 // pool and when parsing line number tables.
102
103 // We add assert in debug mode when class format is not checked.
104
105 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
106 #define JAVA_MIN_SUPPORTED_VERSION 45
107 #define JAVA_PREVIEW_MINOR_VERSION 65535
108
109 // Used for two backward compatibility reasons:
110 // - to check for new additions to the class file format in JDK1.5
111 // - to check for bug fixes in the format checker in JDK1.5
112 #define JAVA_1_5_VERSION 49
113
114 // Used for backward compatibility reasons:
115 // - to check for javac bug fixes that happened after 1.5
116 // - also used as the max version when running in jdk6
117 #define JAVA_6_VERSION 50
118
119 // Used for backward compatibility reasons:
120 // - to disallow argument and require ACC_STATIC for <clinit> methods
121 #define JAVA_7_VERSION 51
122
123 // Extension method support.
124 #define JAVA_8_VERSION 52
125
126 #define JAVA_9_VERSION 53
127
128 #define JAVA_10_VERSION 54
129
130 #define JAVA_11_VERSION 55
131
132 #define JAVA_12_VERSION 56
133
134 #define JAVA_13_VERSION 57
135
136 #define JAVA_14_VERSION 58
137
138 #define JAVA_15_VERSION 59
139
140 #define JAVA_16_VERSION 60
141
142 #define JAVA_17_VERSION 61
143
144 #define JAVA_18_VERSION 62
145
146 #define JAVA_19_VERSION 63
147
148 #define JAVA_20_VERSION 64
149
150 #define JAVA_21_VERSION 65
151
152 #define JAVA_22_VERSION 66
153
154 #define CONSTANT_CLASS_DESCRIPTORS 66
155
156 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
157 assert((bad_constant == JVM_CONSTANT_Module ||
158 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
159 "Unexpected bad constant pool entry");
160 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
161 }
162
163 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
164 ConstantPool* cp,
165 const int length,
166 TRAPS) {
167 assert(stream != nullptr, "invariant");
168 assert(cp != nullptr, "invariant");
169
170 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
171 // this function (_current can be allocated in a register, with scalar
172 // replacement of aggregates). The _current pointer is copied back to
173 // stream() when this function returns. DON'T call another method within
174 // this method that uses stream().
175 const ClassFileStream cfs1 = *stream;
176 const ClassFileStream* const cfs = &cfs1;
177
178 debug_only(const u1* const old_current = stream->current();)
179
180 // Used for batching symbol allocations.
181 const char* names[SymbolTable::symbol_alloc_batch_size];
182 int lengths[SymbolTable::symbol_alloc_batch_size];
183 int indices[SymbolTable::symbol_alloc_batch_size];
184 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
185 int names_count = 0;
186
187 // parsing Index 0 is unused
188 for (int index = 1; index < length; index++) {
189 // Each of the following case guarantees one more byte in the stream
190 // for the following tag or the access_flags following constant pool,
191 // so we don't need bounds-check for reading tag.
192 const u1 tag = cfs->get_u1_fast();
193 switch (tag) {
194 case JVM_CONSTANT_Class: {
195 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
196 const u2 name_index = cfs->get_u2_fast();
197 cp->klass_index_at_put(index, name_index);
198 break;
199 }
200 case JVM_CONSTANT_Fieldref: {
201 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
202 const u2 class_index = cfs->get_u2_fast();
203 const u2 name_and_type_index = cfs->get_u2_fast();
204 cp->field_at_put(index, class_index, name_and_type_index);
205 break;
206 }
207 case JVM_CONSTANT_Methodref: {
208 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
209 const u2 class_index = cfs->get_u2_fast();
210 const u2 name_and_type_index = cfs->get_u2_fast();
211 cp->method_at_put(index, class_index, name_and_type_index);
212 break;
213 }
214 case JVM_CONSTANT_InterfaceMethodref: {
215 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
216 const u2 class_index = cfs->get_u2_fast();
217 const u2 name_and_type_index = cfs->get_u2_fast();
218 cp->interface_method_at_put(index, class_index, name_and_type_index);
219 break;
220 }
221 case JVM_CONSTANT_String : {
222 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
223 const u2 string_index = cfs->get_u2_fast();
224 cp->string_index_at_put(index, string_index);
225 break;
226 }
227 case JVM_CONSTANT_MethodHandle :
228 case JVM_CONSTANT_MethodType: {
229 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
230 classfile_parse_error(
231 "Class file version does not support constant tag %u in class file %s",
232 tag, THREAD);
233 return;
234 }
235 if (tag == JVM_CONSTANT_MethodHandle) {
236 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
237 const u1 ref_kind = cfs->get_u1_fast();
238 const u2 method_index = cfs->get_u2_fast();
239 cp->method_handle_index_at_put(index, ref_kind, method_index);
240 }
241 else if (tag == JVM_CONSTANT_MethodType) {
242 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
243 const u2 signature_index = cfs->get_u2_fast();
244 cp->method_type_index_at_put(index, signature_index);
245 }
246 else {
247 ShouldNotReachHere();
248 }
249 break;
250 }
251 case JVM_CONSTANT_Dynamic : {
252 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
253 classfile_parse_error(
254 "Class file version does not support constant tag %u in class file %s",
255 tag, THREAD);
256 return;
257 }
258 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
259 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
260 const u2 name_and_type_index = cfs->get_u2_fast();
261 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
262 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
263 }
264 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
265 break;
266 }
267 case JVM_CONSTANT_InvokeDynamic : {
268 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
269 classfile_parse_error(
270 "Class file version does not support constant tag %u in class file %s",
271 tag, THREAD);
272 return;
273 }
274 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
275 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
276 const u2 name_and_type_index = cfs->get_u2_fast();
277 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
278 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
279 }
280 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
281 break;
282 }
283 case JVM_CONSTANT_Integer: {
284 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
285 const u4 bytes = cfs->get_u4_fast();
286 cp->int_at_put(index, (jint)bytes);
287 break;
288 }
289 case JVM_CONSTANT_Float: {
290 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
291 const u4 bytes = cfs->get_u4_fast();
292 cp->float_at_put(index, *(jfloat*)&bytes);
293 break;
294 }
295 case JVM_CONSTANT_Long: {
296 // A mangled type might cause you to overrun allocated memory
297 guarantee_property(index + 1 < length,
298 "Invalid constant pool entry %u in class file %s",
299 index,
300 CHECK);
301 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
302 const u8 bytes = cfs->get_u8_fast();
303 cp->long_at_put(index, bytes);
304 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
305 break;
306 }
307 case JVM_CONSTANT_Double: {
308 // A mangled type might cause you to overrun allocated memory
309 guarantee_property(index+1 < length,
310 "Invalid constant pool entry %u in class file %s",
311 index,
312 CHECK);
313 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
314 const u8 bytes = cfs->get_u8_fast();
315 cp->double_at_put(index, *(jdouble*)&bytes);
316 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
317 break;
318 }
319 case JVM_CONSTANT_NameAndType: {
320 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
321 const u2 name_index = cfs->get_u2_fast();
322 const u2 signature_index = cfs->get_u2_fast();
323 cp->name_and_type_at_put(index, name_index, signature_index);
324 break;
325 }
326 case JVM_CONSTANT_Utf8 : {
327 cfs->guarantee_more(2, CHECK); // utf8_length
328 u2 utf8_length = cfs->get_u2_fast();
329 const u1* utf8_buffer = cfs->current();
330 assert(utf8_buffer != nullptr, "null utf8 buffer");
331 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
332 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
333 cfs->skip_u1_fast(utf8_length);
334
335 // Before storing the symbol, make sure it's legal
336 if (_need_verify) {
337 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
338 }
339
340 unsigned int hash;
341 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
342 utf8_length,
343 hash);
344 if (result == nullptr) {
345 names[names_count] = (const char*)utf8_buffer;
346 lengths[names_count] = utf8_length;
347 indices[names_count] = index;
348 hashValues[names_count++] = hash;
349 if (names_count == SymbolTable::symbol_alloc_batch_size) {
350 SymbolTable::new_symbols(_loader_data,
351 constantPoolHandle(THREAD, cp),
352 names_count,
353 names,
354 lengths,
355 indices,
356 hashValues);
357 names_count = 0;
358 }
359 } else {
360 cp->symbol_at_put(index, result);
361 }
362 break;
363 }
364 case JVM_CONSTANT_Module:
365 case JVM_CONSTANT_Package: {
366 // Record that an error occurred in these two cases but keep parsing so
367 // that ACC_Module can be checked for in the access_flags. Need to
368 // throw NoClassDefFoundError in that case.
369 if (_major_version >= JAVA_9_VERSION) {
370 cfs->guarantee_more(3, CHECK);
371 cfs->get_u2_fast();
372 set_class_bad_constant_seen(tag);
373 break;
374 }
375 }
376 default: {
377 classfile_parse_error("Unknown constant tag %u in class file %s",
378 tag,
379 THREAD);
380 return;
381 }
382 } // end of switch(tag)
383 } // end of for
384
385 // Allocate the remaining symbols
386 if (names_count > 0) {
387 SymbolTable::new_symbols(_loader_data,
388 constantPoolHandle(THREAD, cp),
389 names_count,
390 names,
391 lengths,
392 indices,
393 hashValues);
394 }
395
396 // Copy _current pointer of local copy back to stream.
397 assert(stream->current() == old_current, "non-exclusive use of stream");
398 stream->set_current(cfs1.current());
399
400 }
401
402 static inline bool valid_cp_range(int index, int length) {
403 return (index > 0 && index < length);
404 }
405
406 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
407 assert(cp != nullptr, "invariant");
408 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
409 return cp->symbol_at(index);
410 }
411 return nullptr;
412 }
413
414 #ifdef ASSERT
415 PRAGMA_DIAG_PUSH
416 PRAGMA_FORMAT_NONLITERAL_IGNORED
417 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
418 ResourceMark rm(THREAD);
419 fatal(msg, _class_name->as_C_string());
420 }
421
422 void ClassFileParser::report_assert_property_failure(const char* msg,
423 int index,
424 TRAPS) const {
425 ResourceMark rm(THREAD);
426 fatal(msg, index, _class_name->as_C_string());
427 }
428 PRAGMA_DIAG_POP
429 #endif
430
431 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
432 ConstantPool* const cp,
433 const int length,
434 TRAPS) {
435 assert(cp != nullptr, "invariant");
436 assert(stream != nullptr, "invariant");
437
438 // parsing constant pool entries
439 parse_constant_pool_entries(stream, cp, length, CHECK);
440 if (class_bad_constant_seen() != 0) {
441 // a bad CP entry has been detected previously so stop parsing and just return.
442 return;
443 }
444
445 int index = 1; // declared outside of loops for portability
446 int num_klasses = 0;
447
448 // first verification pass - validate cross references
449 // and fixup class and string constants
450 for (index = 1; index < length; index++) { // Index 0 is unused
451 const jbyte tag = cp->tag_at(index).value();
452 switch (tag) {
453 case JVM_CONSTANT_Class: {
454 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
455 break;
456 }
457 case JVM_CONSTANT_Fieldref:
458 // fall through
459 case JVM_CONSTANT_Methodref:
460 // fall through
461 case JVM_CONSTANT_InterfaceMethodref: {
462 if (!_need_verify) break;
463 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
464 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
465 check_property(valid_klass_reference_at(klass_ref_index),
466 "Invalid constant pool index %u in class file %s",
467 klass_ref_index, CHECK);
468 check_property(valid_cp_range(name_and_type_ref_index, length) &&
469 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
470 "Invalid constant pool index %u in class file %s",
471 name_and_type_ref_index, CHECK);
472 break;
473 }
474 case JVM_CONSTANT_String: {
475 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
476 break;
477 }
478 case JVM_CONSTANT_Integer:
479 break;
480 case JVM_CONSTANT_Float:
481 break;
482 case JVM_CONSTANT_Long:
483 case JVM_CONSTANT_Double: {
484 index++;
485 check_property(
486 (index < length && cp->tag_at(index).is_invalid()),
487 "Improper constant pool long/double index %u in class file %s",
488 index, CHECK);
489 break;
490 }
491 case JVM_CONSTANT_NameAndType: {
492 if (!_need_verify) break;
493 const int name_ref_index = cp->name_ref_index_at(index);
494 const int signature_ref_index = cp->signature_ref_index_at(index);
495 check_property(valid_symbol_at(name_ref_index),
496 "Invalid constant pool index %u in class file %s",
497 name_ref_index, CHECK);
498 check_property(valid_symbol_at(signature_ref_index),
499 "Invalid constant pool index %u in class file %s",
500 signature_ref_index, CHECK);
501 break;
502 }
503 case JVM_CONSTANT_Utf8:
504 break;
505 case JVM_CONSTANT_UnresolvedClass: // fall-through
506 case JVM_CONSTANT_UnresolvedClassInError: {
507 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
508 break;
509 }
510 case JVM_CONSTANT_ClassIndex: {
511 const int class_index = cp->klass_index_at(index);
512 check_property(valid_symbol_at(class_index),
513 "Invalid constant pool index %u in class file %s",
514 class_index, CHECK);
515
516 Symbol* const name = cp->symbol_at(class_index);
517 const unsigned int name_len = name->utf8_length();
518 if (name->is_Q_signature()) {
519 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
520 } else {
521 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
522 }
523 break;
524 }
525 case JVM_CONSTANT_StringIndex: {
526 const int string_index = cp->string_index_at(index);
527 check_property(valid_symbol_at(string_index),
528 "Invalid constant pool index %u in class file %s",
529 string_index, CHECK);
530 Symbol* const sym = cp->symbol_at(string_index);
531 cp->unresolved_string_at_put(index, sym);
532 break;
533 }
534 case JVM_CONSTANT_MethodHandle: {
535 const int ref_index = cp->method_handle_index_at(index);
536 check_property(valid_cp_range(ref_index, length),
537 "Invalid constant pool index %u in class file %s",
538 ref_index, CHECK);
539 const constantTag tag = cp->tag_at(ref_index);
540 const int ref_kind = cp->method_handle_ref_kind_at(index);
541
542 switch (ref_kind) {
543 case JVM_REF_getField:
544 case JVM_REF_getStatic:
545 case JVM_REF_putField:
546 case JVM_REF_putStatic: {
547 check_property(
548 tag.is_field(),
549 "Invalid constant pool index %u in class file %s (not a field)",
550 ref_index, CHECK);
551 break;
552 }
553 case JVM_REF_invokeVirtual:
554 case JVM_REF_newInvokeSpecial: {
555 check_property(
556 tag.is_method(),
557 "Invalid constant pool index %u in class file %s (not a method)",
558 ref_index, CHECK);
559 break;
560 }
561 case JVM_REF_invokeStatic:
562 case JVM_REF_invokeSpecial: {
563 check_property(
564 tag.is_method() ||
565 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
566 "Invalid constant pool index %u in class file %s (not a method)",
567 ref_index, CHECK);
568 break;
569 }
570 case JVM_REF_invokeInterface: {
571 check_property(
572 tag.is_interface_method(),
573 "Invalid constant pool index %u in class file %s (not an interface method)",
574 ref_index, CHECK);
575 break;
576 }
577 default: {
578 classfile_parse_error(
579 "Bad method handle kind at constant pool index %u in class file %s",
580 index, THREAD);
581 return;
582 }
583 } // switch(refkind)
584 // Keep the ref_index unchanged. It will be indirected at link-time.
585 break;
586 } // case MethodHandle
587 case JVM_CONSTANT_MethodType: {
588 const int ref_index = cp->method_type_index_at(index);
589 check_property(valid_symbol_at(ref_index),
590 "Invalid constant pool index %u in class file %s",
591 ref_index, CHECK);
592 break;
593 }
594 case JVM_CONSTANT_Dynamic: {
595 const int name_and_type_ref_index =
596 cp->bootstrap_name_and_type_ref_index_at(index);
597
598 check_property(valid_cp_range(name_and_type_ref_index, length) &&
599 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
600 "Invalid constant pool index %u in class file %s",
601 name_and_type_ref_index, CHECK);
602 // bootstrap specifier index must be checked later,
603 // when BootstrapMethods attr is available
604
605 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
606 cp->set_has_dynamic_constant();
607 break;
608 }
609 case JVM_CONSTANT_InvokeDynamic: {
610 const int name_and_type_ref_index =
611 cp->bootstrap_name_and_type_ref_index_at(index);
612
613 check_property(valid_cp_range(name_and_type_ref_index, length) &&
614 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
615 "Invalid constant pool index %u in class file %s",
616 name_and_type_ref_index, CHECK);
617 // bootstrap specifier index must be checked later,
618 // when BootstrapMethods attr is available
619 break;
620 }
621 default: {
622 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
623 ShouldNotReachHere();
624 break;
625 }
626 } // switch(tag)
627 } // end of for
628
629 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
630
631 if (!_need_verify) {
632 return;
633 }
634
635 // second verification pass - checks the strings are of the right format.
636 // but not yet to the other entries
637 for (index = 1; index < length; index++) {
638 const jbyte tag = cp->tag_at(index).value();
639 switch (tag) {
640 case JVM_CONSTANT_UnresolvedClass: {
641 const Symbol* const class_name = cp->klass_name_at(index);
642 // check the name
643 verify_legal_class_name(class_name, CHECK);
644 break;
645 }
646 case JVM_CONSTANT_NameAndType: {
647 if (_need_verify) {
648 const int sig_index = cp->signature_ref_index_at(index);
649 const int name_index = cp->name_ref_index_at(index);
650 const Symbol* const name = cp->symbol_at(name_index);
651 const Symbol* const sig = cp->symbol_at(sig_index);
652 guarantee_property(sig->utf8_length() != 0,
653 "Illegal zero length constant pool entry at %d in class %s",
654 sig_index, CHECK);
655 guarantee_property(name->utf8_length() != 0,
656 "Illegal zero length constant pool entry at %d in class %s",
657 name_index, CHECK);
658
659 if (Signature::is_method(sig)) {
660 // Format check method name and signature
661 verify_legal_method_name(name, CHECK);
662 verify_legal_method_signature(name, sig, CHECK);
663 } else {
664 // Format check field name and signature
665 verify_legal_field_name(name, CHECK);
666 verify_legal_field_signature(name, sig, CHECK);
667 }
668 }
669 break;
670 }
671 case JVM_CONSTANT_Dynamic: {
672 const int name_and_type_ref_index =
673 cp->uncached_name_and_type_ref_index_at(index);
674 // already verified to be utf8
675 const int name_ref_index =
676 cp->name_ref_index_at(name_and_type_ref_index);
677 // already verified to be utf8
678 const int signature_ref_index =
679 cp->signature_ref_index_at(name_and_type_ref_index);
680 const Symbol* const name = cp->symbol_at(name_ref_index);
681 const Symbol* const signature = cp->symbol_at(signature_ref_index);
682 if (_need_verify) {
683 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
684 // Need only to be sure signature is the right type.
685 if (Signature::is_method(signature)) {
686 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
687 }
688 }
689 break;
690 }
691 case JVM_CONSTANT_InvokeDynamic:
692 case JVM_CONSTANT_Fieldref:
693 case JVM_CONSTANT_Methodref:
694 case JVM_CONSTANT_InterfaceMethodref: {
695 const int name_and_type_ref_index =
696 cp->uncached_name_and_type_ref_index_at(index);
697 // already verified to be utf8
698 const int name_ref_index =
699 cp->name_ref_index_at(name_and_type_ref_index);
700 // already verified to be utf8
701 const int signature_ref_index =
702 cp->signature_ref_index_at(name_and_type_ref_index);
703 const Symbol* const name = cp->symbol_at(name_ref_index);
704 const Symbol* const signature = cp->symbol_at(signature_ref_index);
705 if (tag == JVM_CONSTANT_Fieldref) {
706 if (_need_verify) {
707 // Field name and signature are verified above, when iterating NameAndType_info.
708 // Need only to be sure signature is non-zero length and the right type.
709 if (Signature::is_method(signature)) {
710 throwIllegalSignature("Field", name, signature, CHECK);
711 }
712 }
713 } else {
714 if (_need_verify) {
715 // Method name and signature are individually verified above, when iterating
716 // NameAndType_info. Need to check here that signature is non-zero length and
717 // the right type.
718 if (!Signature::is_method(signature)) {
719 throwIllegalSignature("Method", name, signature, CHECK);
720 }
721 }
722 // If a class method name begins with '<', it must be "<init>" and have void signature,
723 // or if it is an inline type, <vnew> with return.
724 const unsigned int name_len = name->utf8_length();
725 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
726 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
727 if (name != vmSymbols::object_initializer_name() &&
728 name != vmSymbols::inline_factory_name()) {
729 classfile_parse_error(
730 "Bad method name at constant pool index %u in class file %s",
731 name_ref_index, THREAD);
732 return;
733 } else if (!Signature::is_void_method(signature)) {
734 // if return type is non-void then it must be an inline type
735 if (name == vmSymbols::object_initializer_name() ||
736 !EnableValhalla || !supports_inline_types() ||
737 !signature->ends_with(JVM_SIGNATURE_ENDCLASS)) {
738 throwIllegalSignature("Method", name, signature, CHECK);
739 }
740 }
741 }
742 }
743 break;
744 }
745 case JVM_CONSTANT_MethodHandle: {
746 const int ref_index = cp->method_handle_index_at(index);
747 const int ref_kind = cp->method_handle_ref_kind_at(index);
748 switch (ref_kind) {
749 case JVM_REF_invokeVirtual:
750 case JVM_REF_invokeStatic:
751 case JVM_REF_invokeSpecial:
752 case JVM_REF_newInvokeSpecial: {
753 const int name_and_type_ref_index =
754 cp->uncached_name_and_type_ref_index_at(ref_index);
755 const int name_ref_index =
756 cp->name_ref_index_at(name_and_type_ref_index);
757 const Symbol* const name = cp->symbol_at(name_ref_index);
758
759 if (EnableValhalla && supports_inline_types() && name == vmSymbols::inline_factory_name()) { // <vnew>
760 // <vnew> factory methods must be non-void return and invokeStatic.
761 const int signature_ref_index =
762 cp->signature_ref_index_at(name_and_type_ref_index);
763 const Symbol* const signature = cp->symbol_at(signature_ref_index);
764 if (signature->is_void_method_signature() || ref_kind != JVM_REF_invokeStatic) {
765 classfile_parse_error(
766 "Bad factory method name at constant pool index %u in class file %s",
767 name_ref_index, CHECK);
768 }
769 } else if (name != vmSymbols::object_initializer_name()) { // !<init>
770 if (ref_kind == JVM_REF_newInvokeSpecial) {
771 classfile_parse_error(
772 "Bad constructor name at constant pool index %u in class file %s",
773 name_ref_index, THREAD);
774 return;
775 }
776 } else { // <init>
777 // The allowed invocation mode of <init> depends on its signature.
778 // This test corresponds to verify_invoke_instructions in the verifier.
779 const int signature_ref_index =
780 cp->signature_ref_index_at(name_and_type_ref_index);
781 const Symbol* const signature = cp->symbol_at(signature_ref_index);
782 if (signature->is_void_method_signature()
783 && ref_kind == JVM_REF_newInvokeSpecial) {
784 // OK, could be a constructor call
785 } else {
786 classfile_parse_error(
787 "Bad method name at constant pool index %u in class file %s",
788 name_ref_index, THREAD);
789 return;
790 }
791 }
792 break;
793 }
794 // Other ref_kinds are already fully checked in previous pass.
795 } // switch(ref_kind)
796 break;
797 }
798 case JVM_CONSTANT_MethodType: {
799 const Symbol* const no_name = vmSymbols::type_name(); // place holder
800 const Symbol* const signature = cp->method_type_signature_at(index);
801 verify_legal_method_signature(no_name, signature, CHECK);
802 break;
803 }
804 case JVM_CONSTANT_Utf8: {
805 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
806 }
807 } // switch(tag)
808 } // end of for
809 }
810
811 class NameSigHash: public ResourceObj {
812 public:
813 const Symbol* _name; // name
814 const Symbol* _sig; // signature
815
816 static const int HASH_ROW_SIZE = 256;
817
818 NameSigHash(Symbol* name, Symbol* sig) :
819 _name(name),
820 _sig(sig) {}
821
822 static unsigned int hash(NameSigHash const& namesig) {
823 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
824 }
825
826 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
827 return (e0._name == e1._name) &&
828 (e0._sig == e1._sig);
829 }
830 };
831
832 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
833 NameSigHash::HASH_ROW_SIZE,
834 AnyObj::RESOURCE_AREA, mtInternal,
835 &NameSigHash::hash, &NameSigHash::equals>;
836
837 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
838 assert(super_type != nullptr,"Method doesn't support null super type");
839 if (super_type->carries_identity_modifier()) {
840 if (current->carries_value_modifier()) {
841 ResourceMark rm(THREAD);
842 Exceptions::fthrow(
843 THREAD_AND_LOCATION,
844 vmSymbols::java_lang_IncompatibleClassChangeError(),
845 "Value type %s has an identity type as supertype",
846 current->class_name()->as_klass_external_name());
847 return;
848 }
849 current->set_carries_identity_modifier();
850 }
851 if (super_type->carries_value_modifier()) {
852 if (current->carries_identity_modifier()) {
853 ResourceMark rm(THREAD);
854 Exceptions::fthrow(
855 THREAD_AND_LOCATION,
856 vmSymbols::java_lang_IncompatibleClassChangeError(),
857 "Identity type %s has a value type as supertype",
858 current->class_name()->as_klass_external_name());
859 return;
860 }
861 current->set_carries_value_modifier();
862 }
863 }
864
865 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
866 int itfs_len,
867 ConstantPool* cp,
868 bool* const has_nonstatic_concrete_methods,
869 // FIXME: lots of these functions
870 // declare their parameters as const,
871 // which adds only noise to the code.
872 // Remove the spurious const modifiers.
873 // Many are of the form "const int x"
874 // or "T* const x".
875 bool* const is_declared_atomic,
876 TRAPS) {
877 assert(stream != nullptr, "invariant");
878 assert(cp != nullptr, "invariant");
879 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
880
881 if (itfs_len == 0) {
882 _local_interfaces = Universe::the_empty_instance_klass_array();
883
884 } else {
885 assert(itfs_len > 0, "only called for len>0");
886 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
887 int index = 0;
888 for (index = 0; index < itfs_len; index++) {
889 const u2 interface_index = stream->get_u2(CHECK);
890 check_property(
891 valid_klass_reference_at(interface_index),
892 "Interface name has bad constant pool index %u in class file %s",
893 interface_index, CHECK);
894 _local_interface_indexes->at_put_grow(index, interface_index);
895 }
896
897 if (!_need_verify || itfs_len <= 1) {
898 return;
899 }
900
901 // Check if there's any duplicates in interfaces
902 ResourceMark rm(THREAD);
903 // Set containing interface names
904 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
905 for (index = 0; index < itfs_len; index++) {
906 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
907 // If no duplicates, add (name, nullptr) in hashtable interface_names.
908 if (!interface_names->put(interface_name, 0)) {
909 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
910 interface_name->as_C_string(), THREAD);
911 return;
912 }
913 }
914 }
915 }
916
917 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
918 int constantvalue_index,
919 int signature_index,
920 TRAPS) const {
921 // Make sure the constant pool entry is of a type appropriate to this field
922 guarantee_property(
923 (constantvalue_index > 0 &&
924 constantvalue_index < cp->length()),
925 "Bad initial value index %u in ConstantValue attribute in class file %s",
926 constantvalue_index, CHECK);
927
928 const constantTag value_type = cp->tag_at(constantvalue_index);
929 switch(cp->basic_type_for_signature_at(signature_index)) {
930 case T_LONG: {
931 guarantee_property(value_type.is_long(),
932 "Inconsistent constant value type in class file %s",
933 CHECK);
934 break;
935 }
936 case T_FLOAT: {
937 guarantee_property(value_type.is_float(),
938 "Inconsistent constant value type in class file %s",
939 CHECK);
940 break;
941 }
942 case T_DOUBLE: {
943 guarantee_property(value_type.is_double(),
944 "Inconsistent constant value type in class file %s",
945 CHECK);
946 break;
947 }
948 case T_BYTE:
949 case T_CHAR:
950 case T_SHORT:
951 case T_BOOLEAN:
952 case T_INT: {
953 guarantee_property(value_type.is_int(),
954 "Inconsistent constant value type in class file %s",
955 CHECK);
956 break;
957 }
958 case T_OBJECT: {
959 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
960 && value_type.is_string()),
961 "Bad string initial value in class file %s",
962 CHECK);
963 break;
964 }
965 default: {
966 classfile_parse_error("Unable to set initial value %u in class file %s",
967 constantvalue_index,
968 THREAD);
969 }
970 }
971 }
972
973 class AnnotationCollector : public ResourceObj{
974 public:
975 enum Location { _in_field, _in_method, _in_class };
976 enum ID {
977 _unknown = 0,
978 _method_CallerSensitive,
979 _method_ForceInline,
980 _method_DontInline,
981 _method_ChangesCurrentThread,
982 _method_JvmtiMountTransition,
983 _method_InjectedProfile,
984 _method_LambdaForm_Compiled,
985 _method_Hidden,
986 _method_Scoped,
987 _method_IntrinsicCandidate,
988 _jdk_internal_vm_annotation_Contended,
989 _field_Stable,
990 _jdk_internal_vm_annotation_ReservedStackAccess,
991 _jdk_internal_ValueBased,
992 _annotation_LIMIT
993 };
994 const Location _location;
995 int _annotations_present;
996 u2 _contended_group;
997
998 AnnotationCollector(Location location)
999 : _location(location), _annotations_present(0), _contended_group(0)
1000 {
1001 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1002 }
1003 // If this annotation name has an ID, report it (or _none).
1004 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
1005 // Set the annotation name:
1006 void set_annotation(ID id) {
1007 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1008 _annotations_present |= nth_bit((int)id);
1009 }
1010
1011 void remove_annotation(ID id) {
1012 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1013 _annotations_present &= ~nth_bit((int)id);
1014 }
1015
1016 // Report if the annotation is present.
1017 bool has_any_annotations() const { return _annotations_present != 0; }
1018 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1019
1020 void set_contended_group(u2 group) { _contended_group = group; }
1021 u2 contended_group() const { return _contended_group; }
1022
1023 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1024
1025 void set_stable(bool stable) { set_annotation(_field_Stable); }
1026 bool is_stable() const { return has_annotation(_field_Stable); }
1027 };
1028
1029 // This class also doubles as a holder for metadata cleanup.
1030 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1031 private:
1032 ClassLoaderData* _loader_data;
1033 AnnotationArray* _field_annotations;
1034 AnnotationArray* _field_type_annotations;
1035 public:
1036 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1037 AnnotationCollector(_in_field),
1038 _loader_data(loader_data),
1039 _field_annotations(nullptr),
1040 _field_type_annotations(nullptr) {}
1041 ~FieldAnnotationCollector();
1042 void apply_to(FieldInfo* f);
1043 AnnotationArray* field_annotations() { return _field_annotations; }
1044 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1045
1046 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1047 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1048 };
1049
1050 class MethodAnnotationCollector : public AnnotationCollector{
1051 public:
1052 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1053 void apply_to(const methodHandle& m);
1054 };
1055
1056 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1057 public:
1058 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1059 void apply_to(InstanceKlass* ik);
1060 };
1061
1062
1063 static int skip_annotation_value(const u1*, int, int); // fwd decl
1064
1065 // Safely increment index by val if does not pass limit
1066 #define SAFE_ADD(index, limit, val) \
1067 if (index >= limit - val) return limit; \
1068 index += val;
1069
1070 // Skip an annotation. Return >=limit if there is any problem.
1071 static int skip_annotation(const u1* buffer, int limit, int index) {
1072 assert(buffer != nullptr, "invariant");
1073 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1074 // value := switch (tag:u1) { ... }
1075 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1076 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1077 while (--nmem >= 0 && index < limit) {
1078 SAFE_ADD(index, limit, 2); // skip member
1079 index = skip_annotation_value(buffer, limit, index);
1080 }
1081 return index;
1082 }
1083
1084 // Skip an annotation value. Return >=limit if there is any problem.
1085 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1086 assert(buffer != nullptr, "invariant");
1087
1088 // value := switch (tag:u1) {
1089 // case B, C, I, S, Z, D, F, J, c: con:u2;
1090 // case e: e_class:u2 e_name:u2;
1091 // case s: s_con:u2;
1092 // case [: do(nval:u2) {value};
1093 // case @: annotation;
1094 // case s: s_con:u2;
1095 // }
1096 SAFE_ADD(index, limit, 1); // read tag
1097 const u1 tag = buffer[index - 1];
1098 switch (tag) {
1099 case 'B':
1100 case 'C':
1101 case 'I':
1102 case 'S':
1103 case 'Z':
1104 case 'D':
1105 case 'F':
1106 case 'J':
1107 case 'c':
1108 case 's':
1109 SAFE_ADD(index, limit, 2); // skip con or s_con
1110 break;
1111 case 'e':
1112 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1113 break;
1114 case '[':
1115 {
1116 SAFE_ADD(index, limit, 2); // read nval
1117 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1118 while (--nval >= 0 && index < limit) {
1119 index = skip_annotation_value(buffer, limit, index);
1120 }
1121 }
1122 break;
1123 case '@':
1124 index = skip_annotation(buffer, limit, index);
1125 break;
1126 default:
1127 return limit; // bad tag byte
1128 }
1129 return index;
1130 }
1131
1132 // Sift through annotations, looking for those significant to the VM:
1133 static void parse_annotations(const ConstantPool* const cp,
1134 const u1* buffer, int limit,
1135 AnnotationCollector* coll,
1136 ClassLoaderData* loader_data,
1137 const bool can_access_vm_annotations) {
1138
1139 assert(cp != nullptr, "invariant");
1140 assert(buffer != nullptr, "invariant");
1141 assert(coll != nullptr, "invariant");
1142 assert(loader_data != nullptr, "invariant");
1143
1144 // annotations := do(nann:u2) {annotation}
1145 int index = 2; // read nann
1146 if (index >= limit) return;
1147 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1148 enum { // initial annotation layout
1149 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1150 count_off = 2, // u2 such as 1 (one value)
1151 member_off = 4, // utf8 such as 'value'
1152 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1153 e_tag_val = 'e',
1154 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1155 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1156 e_size = 11, // end of 'e' annotation
1157 c_tag_val = 'c', // payload is type
1158 c_con_off = 7, // utf8 payload, such as 'I'
1159 c_size = 9, // end of 'c' annotation
1160 s_tag_val = 's', // payload is String
1161 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1162 s_size = 9,
1163 min_size = 6 // smallest possible size (zero members)
1164 };
1165 // Cannot add min_size to index in case of overflow MAX_INT
1166 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1167 int index0 = index;
1168 index = skip_annotation(buffer, limit, index);
1169 const u1* const abase = buffer + index0;
1170 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1171 const int count = Bytes::get_Java_u2((address)abase + count_off);
1172 const Symbol* const aname = check_symbol_at(cp, atype);
1173 if (aname == nullptr) break; // invalid annotation name
1174 const Symbol* member = nullptr;
1175 if (count >= 1) {
1176 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1177 member = check_symbol_at(cp, member_index);
1178 if (member == nullptr) break; // invalid member name
1179 }
1180
1181 // Here is where parsing particular annotations will take place.
1182 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1183 if (AnnotationCollector::_unknown == id) continue;
1184 coll->set_annotation(id);
1185
1186 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1187 // @Contended can optionally specify the contention group.
1188 //
1189 // Contended group defines the equivalence class over the fields:
1190 // the fields within the same contended group are not treated distinct.
1191 // The only exception is default group, which does not incur the
1192 // equivalence. Naturally, contention group for classes is meaningless.
1193 //
1194 // While the contention group is specified as String, annotation
1195 // values are already interned, and we might as well use the constant
1196 // pool index as the group tag.
1197 //
1198 u2 group_index = 0; // default contended group
1199 if (count == 1
1200 && s_size == (index - index0) // match size
1201 && s_tag_val == *(abase + tag_off)
1202 && member == vmSymbols::value_name()) {
1203 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1204 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1205 group_index = 0; // default contended group
1206 }
1207 }
1208 coll->set_contended_group(group_index);
1209 }
1210 }
1211 }
1212
1213
1214 // Parse attributes for a field.
1215 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1216 u2 attributes_count,
1217 bool is_static, u2 signature_index,
1218 u2* const constantvalue_index_addr,
1219 bool* const is_synthetic_addr,
1220 u2* const generic_signature_index_addr,
1221 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1222 TRAPS) {
1223 assert(cfs != nullptr, "invariant");
1224 assert(constantvalue_index_addr != nullptr, "invariant");
1225 assert(is_synthetic_addr != nullptr, "invariant");
1226 assert(generic_signature_index_addr != nullptr, "invariant");
1227 assert(parsed_annotations != nullptr, "invariant");
1228 assert(attributes_count > 0, "attributes_count should be greater than 0");
1229
1230 u2 constantvalue_index = 0;
1231 u2 generic_signature_index = 0;
1232 bool is_synthetic = false;
1233 const u1* runtime_visible_annotations = nullptr;
1234 int runtime_visible_annotations_length = 0;
1235 const u1* runtime_invisible_annotations = nullptr;
1236 int runtime_invisible_annotations_length = 0;
1237 const u1* runtime_visible_type_annotations = nullptr;
1238 int runtime_visible_type_annotations_length = 0;
1239 const u1* runtime_invisible_type_annotations = nullptr;
1240 int runtime_invisible_type_annotations_length = 0;
1241 bool runtime_invisible_annotations_exists = false;
1242 bool runtime_invisible_type_annotations_exists = false;
1243 const ConstantPool* const cp = _cp;
1244
1245 while (attributes_count--) {
1246 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1247 const u2 attribute_name_index = cfs->get_u2_fast();
1248 const u4 attribute_length = cfs->get_u4_fast();
1249 check_property(valid_symbol_at(attribute_name_index),
1250 "Invalid field attribute index %u in class file %s",
1251 attribute_name_index,
1252 CHECK);
1253
1254 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1255 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1256 // ignore if non-static
1257 if (constantvalue_index != 0) {
1258 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1259 return;
1260 }
1261 check_property(
1262 attribute_length == 2,
1263 "Invalid ConstantValue field attribute length %u in class file %s",
1264 attribute_length, CHECK);
1265
1266 constantvalue_index = cfs->get_u2(CHECK);
1267 if (_need_verify) {
1268 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1269 }
1270 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1271 if (attribute_length != 0) {
1272 classfile_parse_error(
1273 "Invalid Synthetic field attribute length %u in class file %s",
1274 attribute_length, THREAD);
1275 return;
1276 }
1277 is_synthetic = true;
1278 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1279 if (attribute_length != 0) {
1280 classfile_parse_error(
1281 "Invalid Deprecated field attribute length %u in class file %s",
1282 attribute_length, THREAD);
1283 return;
1284 }
1285 } else if (_major_version >= JAVA_1_5_VERSION) {
1286 if (attribute_name == vmSymbols::tag_signature()) {
1287 if (generic_signature_index != 0) {
1288 classfile_parse_error(
1289 "Multiple Signature attributes for field in class file %s", THREAD);
1290 return;
1291 }
1292 if (attribute_length != 2) {
1293 classfile_parse_error(
1294 "Wrong size %u for field's Signature attribute in class file %s",
1295 attribute_length, THREAD);
1296 return;
1297 }
1298 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1299 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1300 if (runtime_visible_annotations != nullptr) {
1301 classfile_parse_error(
1302 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1303 return;
1304 }
1305 runtime_visible_annotations_length = attribute_length;
1306 runtime_visible_annotations = cfs->current();
1307 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1308 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1309 parse_annotations(cp,
1310 runtime_visible_annotations,
1311 runtime_visible_annotations_length,
1312 parsed_annotations,
1313 _loader_data,
1314 _can_access_vm_annotations);
1315 cfs->skip_u1_fast(runtime_visible_annotations_length);
1316 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1317 if (runtime_invisible_annotations_exists) {
1318 classfile_parse_error(
1319 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1320 return;
1321 }
1322 runtime_invisible_annotations_exists = true;
1323 if (PreserveAllAnnotations) {
1324 runtime_invisible_annotations_length = attribute_length;
1325 runtime_invisible_annotations = cfs->current();
1326 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
1327 }
1328 cfs->skip_u1(attribute_length, CHECK);
1329 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1330 if (runtime_visible_type_annotations != nullptr) {
1331 classfile_parse_error(
1332 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1333 return;
1334 }
1335 runtime_visible_type_annotations_length = attribute_length;
1336 runtime_visible_type_annotations = cfs->current();
1337 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1338 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1339 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1340 if (runtime_invisible_type_annotations_exists) {
1341 classfile_parse_error(
1342 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1343 return;
1344 } else {
1345 runtime_invisible_type_annotations_exists = true;
1346 }
1347 if (PreserveAllAnnotations) {
1348 runtime_invisible_type_annotations_length = attribute_length;
1349 runtime_invisible_type_annotations = cfs->current();
1350 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
1351 }
1352 cfs->skip_u1(attribute_length, CHECK);
1353 } else {
1354 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1355 }
1356 } else {
1357 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1358 }
1359 }
1360
1361 *constantvalue_index_addr = constantvalue_index;
1362 *is_synthetic_addr = is_synthetic;
1363 *generic_signature_index_addr = generic_signature_index;
1364 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1365 runtime_visible_annotations_length,
1366 runtime_invisible_annotations,
1367 runtime_invisible_annotations_length,
1368 CHECK);
1369 parsed_annotations->set_field_annotations(a);
1370 a = assemble_annotations(runtime_visible_type_annotations,
1371 runtime_visible_type_annotations_length,
1372 runtime_invisible_type_annotations,
1373 runtime_invisible_type_annotations_length,
1374 CHECK);
1375 parsed_annotations->set_field_type_annotations(a);
1376 return;
1377 }
1378
1379
1380 // Field allocation types. Used for computing field offsets.
1381
1382 enum FieldAllocationType {
1383 STATIC_OOP, // Oops
1384 STATIC_BYTE, // Boolean, Byte, char
1385 STATIC_SHORT, // shorts
1386 STATIC_WORD, // ints
1387 STATIC_DOUBLE, // aligned long or double
1388 STATIC_INLINE, // inline type field
1389 NONSTATIC_OOP,
1390 NONSTATIC_BYTE,
1391 NONSTATIC_SHORT,
1392 NONSTATIC_WORD,
1393 NONSTATIC_DOUBLE,
1394 NONSTATIC_INLINE,
1395 MAX_FIELD_ALLOCATION_TYPE,
1396 BAD_ALLOCATION_TYPE = -1
1397 };
1398
1399 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1400 BAD_ALLOCATION_TYPE, // 0
1401 BAD_ALLOCATION_TYPE, // 1
1402 BAD_ALLOCATION_TYPE, // 2
1403 BAD_ALLOCATION_TYPE, // 3
1404 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1405 NONSTATIC_SHORT, // T_CHAR = 5,
1406 NONSTATIC_WORD, // T_FLOAT = 6,
1407 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1408 NONSTATIC_BYTE, // T_BYTE = 8,
1409 NONSTATIC_SHORT, // T_SHORT = 9,
1410 NONSTATIC_WORD, // T_INT = 10,
1411 NONSTATIC_DOUBLE, // T_LONG = 11,
1412 NONSTATIC_OOP, // T_OBJECT = 12,
1413 NONSTATIC_OOP, // T_ARRAY = 13,
1414 NONSTATIC_OOP, // T_PRIMITIVE_OBJECT = 14,
1415 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1416 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1417 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1418 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1419 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1420 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1421 BAD_ALLOCATION_TYPE, // 0
1422 BAD_ALLOCATION_TYPE, // 1
1423 BAD_ALLOCATION_TYPE, // 2
1424 BAD_ALLOCATION_TYPE, // 3
1425 STATIC_BYTE , // T_BOOLEAN = 4,
1426 STATIC_SHORT, // T_CHAR = 5,
1427 STATIC_WORD, // T_FLOAT = 6,
1428 STATIC_DOUBLE, // T_DOUBLE = 7,
1429 STATIC_BYTE, // T_BYTE = 8,
1430 STATIC_SHORT, // T_SHORT = 9,
1431 STATIC_WORD, // T_INT = 10,
1432 STATIC_DOUBLE, // T_LONG = 11,
1433 STATIC_OOP, // T_OBJECT = 12,
1434 STATIC_OOP, // T_ARRAY = 13,
1435 STATIC_OOP, // T_PRIMITIVE_OBJECT = 14,
1436 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1437 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1438 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1439 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1440 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1441 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1442 };
1443
1444 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_inline_type) {
1445 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1446 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1447 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1448 if (is_inline_type) {
1449 result = is_static ? STATIC_INLINE : NONSTATIC_INLINE;
1450 }
1451 return result;
1452 }
1453
1454 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1455 public:
1456 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1457
1458 FieldAllocationCount() {
1459 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1460 count[i] = 0;
1461 }
1462 }
1463
1464 void update(bool is_static, BasicType type, bool is_inline_type) {
1465 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_inline_type);
1466 if (atype != BAD_ALLOCATION_TYPE) {
1467 // Make sure there is no overflow with injected fields.
1468 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1469 count[atype]++;
1470 }
1471 }
1472 };
1473
1474 // Side-effects: populates the _fields, _fields_annotations,
1475 // _fields_type_annotations fields
1476 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1477 AccessFlags class_access_flags,
1478 FieldAllocationCount* const fac,
1479 ConstantPool* cp,
1480 const int cp_size,
1481 u2* const java_fields_count_ptr,
1482 TRAPS) {
1483
1484 assert(cfs != nullptr, "invariant");
1485 assert(fac != nullptr, "invariant");
1486 assert(cp != nullptr, "invariant");
1487 assert(java_fields_count_ptr != nullptr, "invariant");
1488
1489 assert(nullptr == _fields_annotations, "invariant");
1490 assert(nullptr == _fields_type_annotations, "invariant");
1491
1492 bool is_inline_type = class_access_flags.is_value_class() && !class_access_flags.is_abstract();
1493 cfs->guarantee_more(2, CHECK); // length
1494 const u2 length = cfs->get_u2_fast();
1495 *java_fields_count_ptr = length;
1496
1497 int num_injected = 0;
1498 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1499 &num_injected);
1500
1501 // two more slots are required for inline classes:
1502 // one for the static field with a reference to the pre-allocated default value
1503 // one for the field the JVM injects when detecting an empty inline class
1504 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1505
1506 // Allocate a temporary resource array to collect field data.
1507 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1508 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1509
1510 int instance_fields_count = 0;
1511 ResourceMark rm(THREAD);
1512 for (int n = 0; n < length; n++) {
1513 // access_flags, name_index, descriptor_index, attributes_count
1514 cfs->guarantee_more(8, CHECK);
1515
1516 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1517
1518 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1519 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1520 AccessFlags access_flags;
1521 access_flags.set_flags(flags);
1522 FieldInfo::FieldFlags fieldFlags(0);
1523
1524 const u2 name_index = cfs->get_u2_fast();
1525 check_property(valid_symbol_at(name_index),
1526 "Invalid constant pool index %u for field name in class file %s",
1527 name_index, CHECK);
1528 const Symbol* const name = cp->symbol_at(name_index);
1529 verify_legal_field_name(name, CHECK);
1530
1531 const u2 signature_index = cfs->get_u2_fast();
1532 check_property(valid_symbol_at(signature_index),
1533 "Invalid constant pool index %u for field signature in class file %s",
1534 signature_index, CHECK);
1535 const Symbol* const sig = cp->symbol_at(signature_index);
1536 verify_legal_field_signature(name, sig, CHECK);
1537 if (!access_flags.is_static()) instance_fields_count++;
1538
1539 u2 constantvalue_index = 0;
1540 bool is_synthetic = false;
1541 u2 generic_signature_index = 0;
1542 const bool is_static = access_flags.is_static();
1543 FieldAnnotationCollector parsed_annotations(_loader_data);
1544
1545 const u2 attributes_count = cfs->get_u2_fast();
1546 if (attributes_count > 0) {
1547 parse_field_attributes(cfs,
1548 attributes_count,
1549 is_static,
1550 signature_index,
1551 &constantvalue_index,
1552 &is_synthetic,
1553 &generic_signature_index,
1554 &parsed_annotations,
1555 CHECK);
1556
1557 if (parsed_annotations.field_annotations() != nullptr) {
1558 if (_fields_annotations == nullptr) {
1559 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1560 _loader_data, length, nullptr,
1561 CHECK);
1562 }
1563 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1564 parsed_annotations.set_field_annotations(nullptr);
1565 }
1566 if (parsed_annotations.field_type_annotations() != nullptr) {
1567 if (_fields_type_annotations == nullptr) {
1568 _fields_type_annotations =
1569 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1570 length,
1571 nullptr,
1572 CHECK);
1573 }
1574 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1575 parsed_annotations.set_field_type_annotations(nullptr);
1576 }
1577
1578 if (is_synthetic) {
1579 access_flags.set_is_synthetic();
1580 }
1581 if (generic_signature_index != 0) {
1582 fieldFlags.update_generic(true);
1583 }
1584 }
1585
1586 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1587
1588 // Update FieldAllocationCount for this kind of field
1589 fac->update(is_static, type, type == T_PRIMITIVE_OBJECT);
1590
1591 // Here, we still detect that the field's type is an inline type by checking if it has
1592 // a Q-descriptor. This test will be replaced later by something not relying on Q-desriptors.
1593 // From this point forward, checking if a field's type is an inline type should be performed
1594 // using the inline_type flag of FieldFlags, and not by looking for a Q-descriptor in its signature
1595 if (type == T_PRIMITIVE_OBJECT) fieldFlags.update_null_free_inline_type(true);
1596
1597 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1598 fi.set_index(n);
1599 if (fieldFlags.is_generic()) {
1600 fi.set_generic_signature_index(generic_signature_index);
1601 }
1602 parsed_annotations.apply_to(&fi);
1603 if (fi.field_flags().is_contended()) {
1604 _has_contended_fields = true;
1605 }
1606 _temp_field_info->append(fi);
1607 }
1608 assert(_temp_field_info->length() == length, "Must be");
1609
1610 int index = length;
1611 if (num_injected != 0) {
1612 for (int n = 0; n < num_injected; n++) {
1613 // Check for duplicates
1614 if (injected[n].may_be_java) {
1615 const Symbol* const name = injected[n].name();
1616 const Symbol* const signature = injected[n].signature();
1617 bool duplicate = false;
1618 for (int i = 0; i < length; i++) {
1619 const FieldInfo* const f = _temp_field_info->adr_at(i);
1620 if (name == cp->symbol_at(f->name_index()) &&
1621 signature == cp->symbol_at(f->signature_index())) {
1622 // Symbol is desclared in Java so skip this one
1623 duplicate = true;
1624 break;
1625 }
1626 }
1627 if (duplicate) {
1628 // These will be removed from the field array at the end
1629 continue;
1630 }
1631 }
1632
1633 // Injected field
1634 FieldInfo::FieldFlags fflags(0);
1635 fflags.update_injected(true);
1636 AccessFlags aflags;
1637 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1638 fi.set_index(index);
1639 _temp_field_info->append(fi);
1640
1641 // Update FieldAllocationCount for this kind of field
1642 const BasicType type = Signature::basic_type(injected[n].signature());
1643 fac->update(false, type, false);
1644 index++;
1645 }
1646 }
1647
1648 if (is_inline_type) {
1649 // Inject static ".default" field
1650 FieldInfo::FieldFlags fflags(0);
1651 fflags.update_injected(true);
1652 AccessFlags aflags(JVM_ACC_STATIC);
1653 FieldInfo fi(aflags,
1654 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1655 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1656 0,
1657 fflags);
1658 fi.set_index(index);
1659 _temp_field_info->append(fi);
1660
1661 const BasicType type = Signature::basic_type(vmSymbols::object_signature());
1662 fac->update(true, type, false);
1663 index++;
1664 }
1665
1666 if (is_inline_type && instance_fields_count == 0) {
1667 // Inject ".empty" dummy field
1668 _is_empty_inline_type = true;
1669
1670 FieldInfo::FieldFlags fflags(0);
1671 fflags.update_injected(true);
1672 AccessFlags aflags;
1673 FieldInfo fi(aflags,
1674 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(empty_marker_name)),
1675 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(byte_signature)),
1676 0,
1677 fflags);
1678 fi.set_index(index);
1679 _temp_field_info->append(fi);
1680
1681 const BasicType type = Signature::basic_type(vmSymbols::byte_signature());
1682 fac->update(false, type, false);
1683 index++;
1684 }
1685
1686 if (instance_fields_count > 0) {
1687 _has_nonstatic_fields = true;
1688 }
1689
1690 assert(_temp_field_info->length() == index, "Must be");
1691
1692 if (_need_verify && length > 1) {
1693 // Check duplicated fields
1694 ResourceMark rm(THREAD);
1695 // Set containing name-signature pairs
1696 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1697 for (int i = 0; i < _temp_field_info->length(); i++) {
1698 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1699 _temp_field_info->adr_at(i)->signature(_cp));
1700 // If no duplicates, add name/signature in hashtable names_and_sigs.
1701 if(!names_and_sigs->put(name_and_sig, 0)) {
1702 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1703 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1704 return;
1705 }
1706 }
1707 }
1708 }
1709
1710
1711 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1712 u4 code_length,
1713 u4 exception_table_length,
1714 TRAPS) {
1715 assert(cfs != nullptr, "invariant");
1716
1717 const unsafe_u2* const exception_table_start = cfs->current();
1718 assert(exception_table_start != nullptr, "null exception table");
1719
1720 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1721 // end_pc,
1722 // handler_pc,
1723 // catch_type_index
1724
1725 // Will check legal target after parsing code array in verifier.
1726 if (_need_verify) {
1727 for (unsigned int i = 0; i < exception_table_length; i++) {
1728 const u2 start_pc = cfs->get_u2_fast();
1729 const u2 end_pc = cfs->get_u2_fast();
1730 const u2 handler_pc = cfs->get_u2_fast();
1731 const u2 catch_type_index = cfs->get_u2_fast();
1732 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1733 "Illegal exception table range in class file %s",
1734 CHECK_NULL);
1735 guarantee_property(handler_pc < code_length,
1736 "Illegal exception table handler in class file %s",
1737 CHECK_NULL);
1738 if (catch_type_index != 0) {
1739 guarantee_property(valid_klass_reference_at(catch_type_index),
1740 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1741 }
1742 }
1743 } else {
1744 cfs->skip_u2_fast(exception_table_length * 4);
1745 }
1746 return exception_table_start;
1747 }
1748
1749 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1750 u4 code_length,
1751 CompressedLineNumberWriteStream**const write_stream,
1752 TRAPS) {
1753
1754 const ClassFileStream* const cfs = _stream;
1755 unsigned int num_entries = cfs->get_u2(CHECK);
1756
1757 // Each entry is a u2 start_pc, and a u2 line_number
1758 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1759
1760 // Verify line number attribute and table length
1761 check_property(
1762 code_attribute_length == sizeof(u2) + length_in_bytes,
1763 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1764
1765 cfs->guarantee_more(length_in_bytes, CHECK);
1766
1767 if ((*write_stream) == nullptr) {
1768 if (length_in_bytes > fixed_buffer_size) {
1769 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1770 } else {
1771 (*write_stream) = new CompressedLineNumberWriteStream(
1772 _linenumbertable_buffer, fixed_buffer_size);
1773 }
1774 }
1775
1776 while (num_entries-- > 0) {
1777 const u2 bci = cfs->get_u2_fast(); // start_pc
1778 const u2 line = cfs->get_u2_fast(); // line_number
1779 guarantee_property(bci < code_length,
1780 "Invalid pc in LineNumberTable in class file %s", CHECK);
1781 (*write_stream)->write_pair(bci, line);
1782 }
1783 }
1784
1785
1786 class LVT_Hash : public AllStatic {
1787 public:
1788
1789 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1790 /*
1791 * 3-tuple start_bci/length/slot has to be unique key,
1792 * so the following comparison seems to be redundant:
1793 * && elem->name_cp_index == entry->_elem->name_cp_index
1794 */
1795 return (e0.start_bci == e1.start_bci &&
1796 e0.length == e1.length &&
1797 e0.name_cp_index == e1.name_cp_index &&
1798 e0.slot == e1.slot);
1799 }
1800
1801 static unsigned int hash(LocalVariableTableElement const& e0) {
1802 unsigned int raw_hash = e0.start_bci;
1803
1804 raw_hash = e0.length + raw_hash * 37;
1805 raw_hash = e0.name_cp_index + raw_hash * 37;
1806 raw_hash = e0.slot + raw_hash * 37;
1807
1808 return raw_hash;
1809 }
1810 };
1811
1812
1813 // Class file LocalVariableTable elements.
1814 class Classfile_LVT_Element {
1815 public:
1816 u2 start_bci;
1817 u2 length;
1818 u2 name_cp_index;
1819 u2 descriptor_cp_index;
1820 u2 slot;
1821 };
1822
1823 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1824 LocalVariableTableElement* const lvt) {
1825 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1826 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1827 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1828 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1829 lvt->signature_cp_index = 0;
1830 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1831 }
1832
1833 // Function is used to parse both attributes:
1834 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1835 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1836 u4 code_length,
1837 u2 max_locals,
1838 u4 code_attribute_length,
1839 u2* const localvariable_table_length,
1840 bool isLVTT,
1841 TRAPS) {
1842 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1843 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1844 const unsigned int size =
1845 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1846
1847 const ConstantPool* const cp = _cp;
1848
1849 // Verify local variable table attribute has right length
1850 if (_need_verify) {
1851 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1852 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1853 }
1854
1855 const unsafe_u2* const localvariable_table_start = cfs->current();
1856 assert(localvariable_table_start != nullptr, "null local variable table");
1857 if (!_need_verify) {
1858 cfs->skip_u2_fast(size);
1859 } else {
1860 cfs->guarantee_more(size * 2, CHECK_NULL);
1861 for(int i = 0; i < (*localvariable_table_length); i++) {
1862 const u2 start_pc = cfs->get_u2_fast();
1863 const u2 length = cfs->get_u2_fast();
1864 const u2 name_index = cfs->get_u2_fast();
1865 const u2 descriptor_index = cfs->get_u2_fast();
1866 const u2 index = cfs->get_u2_fast();
1867 // Assign to a u4 to avoid overflow
1868 const u4 end_pc = (u4)start_pc + (u4)length;
1869
1870 if (start_pc >= code_length) {
1871 classfile_parse_error(
1872 "Invalid start_pc %u in %s in class file %s",
1873 start_pc, tbl_name, THREAD);
1874 return nullptr;
1875 }
1876 if (end_pc > code_length) {
1877 classfile_parse_error(
1878 "Invalid length %u in %s in class file %s",
1879 length, tbl_name, THREAD);
1880 return nullptr;
1881 }
1882 const int cp_size = cp->length();
1883 guarantee_property(valid_symbol_at(name_index),
1884 "Name index %u in %s has bad constant type in class file %s",
1885 name_index, tbl_name, CHECK_NULL);
1886 guarantee_property(valid_symbol_at(descriptor_index),
1887 "Signature index %u in %s has bad constant type in class file %s",
1888 descriptor_index, tbl_name, CHECK_NULL);
1889
1890 const Symbol* const name = cp->symbol_at(name_index);
1891 const Symbol* const sig = cp->symbol_at(descriptor_index);
1892 verify_legal_field_name(name, CHECK_NULL);
1893 u2 extra_slot = 0;
1894 if (!isLVTT) {
1895 verify_legal_field_signature(name, sig, CHECK_NULL);
1896
1897 // 4894874: check special cases for double and long local variables
1898 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1899 sig == vmSymbols::type_signature(T_LONG)) {
1900 extra_slot = 1;
1901 }
1902 }
1903 guarantee_property((index + extra_slot) < max_locals,
1904 "Invalid index %u in %s in class file %s",
1905 index, tbl_name, CHECK_NULL);
1906 }
1907 }
1908 return localvariable_table_start;
1909 }
1910
1911 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1912 u4 code_attribute_length,
1913 TRAPS) {
1914 assert(cfs != nullptr, "invariant");
1915
1916 if (0 == code_attribute_length) {
1917 return nullptr;
1918 }
1919
1920 const u1* const stackmap_table_start = cfs->current();
1921 assert(stackmap_table_start != nullptr, "null stackmap table");
1922
1923 // check code_attribute_length
1924 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1925
1926 return stackmap_table_start;
1927 }
1928
1929 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1930 u2* const checked_exceptions_length,
1931 u4 method_attribute_length,
1932 TRAPS) {
1933 assert(cfs != nullptr, "invariant");
1934 assert(checked_exceptions_length != nullptr, "invariant");
1935
1936 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1937 *checked_exceptions_length = cfs->get_u2_fast();
1938 const unsigned int size =
1939 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1940 const unsafe_u2* const checked_exceptions_start = cfs->current();
1941 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1942 if (!_need_verify) {
1943 cfs->skip_u2_fast(size);
1944 } else {
1945 // Verify each value in the checked exception table
1946 u2 checked_exception;
1947 const u2 len = *checked_exceptions_length;
1948 cfs->guarantee_more(2 * len, CHECK_NULL);
1949 for (int i = 0; i < len; i++) {
1950 checked_exception = cfs->get_u2_fast();
1951 check_property(
1952 valid_klass_reference_at(checked_exception),
1953 "Exception name has bad type at constant pool %u in class file %s",
1954 checked_exception, CHECK_NULL);
1955 }
1956 }
1957 // check exceptions attribute length
1958 if (_need_verify) {
1959 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1960 sizeof(u2) * size),
1961 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1962 }
1963 return checked_exceptions_start;
1964 }
1965
1966 void ClassFileParser::throwIllegalSignature(const char* type,
1967 const Symbol* name,
1968 const Symbol* sig,
1969 TRAPS) const {
1970 assert(name != nullptr, "invariant");
1971 assert(sig != nullptr, "invariant");
1972
1973 const char* class_note = "";
1974 if (is_inline_type() && name == vmSymbols::object_initializer_name()) {
1975 class_note = " (an inline class)";
1976 }
1977
1978 ResourceMark rm(THREAD);
1979 Exceptions::fthrow(THREAD_AND_LOCATION,
1980 vmSymbols::java_lang_ClassFormatError(),
1981 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
1982 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
1983 }
1984
1985 AnnotationCollector::ID
1986 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1987 const Symbol* name,
1988 const bool can_access_vm_annotations) {
1989 const vmSymbolID sid = vmSymbols::find_sid(name);
1990 // Privileged code can use all annotations. Other code silently drops some.
1991 const bool privileged = loader_data->is_boot_class_loader_data() ||
1992 loader_data->is_platform_class_loader_data() ||
1993 can_access_vm_annotations;
1994 switch (sid) {
1995 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1996 if (_location != _in_method) break; // only allow for methods
1997 if (!privileged) break; // only allow in privileged code
1998 return _method_CallerSensitive;
1999 }
2000 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2001 if (_location != _in_method) break; // only allow for methods
2002 if (!privileged) break; // only allow in privileged code
2003 return _method_ForceInline;
2004 }
2005 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2006 if (_location != _in_method) break; // only allow for methods
2007 if (!privileged) break; // only allow in privileged code
2008 return _method_DontInline;
2009 }
2010 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
2011 if (_location != _in_method) break; // only allow for methods
2012 if (!privileged) break; // only allow in privileged code
2013 return _method_ChangesCurrentThread;
2014 }
2015 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
2016 if (_location != _in_method) break; // only allow for methods
2017 if (!privileged) break; // only allow in privileged code
2018 return _method_JvmtiMountTransition;
2019 }
2020 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2021 if (_location != _in_method) break; // only allow for methods
2022 if (!privileged) break; // only allow in privileged code
2023 return _method_InjectedProfile;
2024 }
2025 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2026 if (_location != _in_method) break; // only allow for methods
2027 if (!privileged) break; // only allow in privileged code
2028 return _method_LambdaForm_Compiled;
2029 }
2030 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2031 if (_location != _in_method) break; // only allow for methods
2032 if (!privileged) break; // only allow in privileged code
2033 return _method_Hidden;
2034 }
2035 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
2036 if (_location != _in_method) break; // only allow for methods
2037 if (!privileged) break; // only allow in privileged code
2038 return _method_Scoped;
2039 }
2040 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
2041 if (_location != _in_method) break; // only allow for methods
2042 if (!privileged) break; // only allow in privileged code
2043 return _method_IntrinsicCandidate;
2044 }
2045 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2046 if (_location != _in_field) break; // only allow for fields
2047 if (!privileged) break; // only allow in privileged code
2048 return _field_Stable;
2049 }
2050 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2051 if (_location != _in_field && _location != _in_class) {
2052 break; // only allow for fields and classes
2053 }
2054 if (!EnableContended || (RestrictContended && !privileged)) {
2055 break; // honor privileges
2056 }
2057 return _jdk_internal_vm_annotation_Contended;
2058 }
2059 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2060 if (_location != _in_method) break; // only allow for methods
2061 if (RestrictReservedStack && !privileged) break; // honor privileges
2062 return _jdk_internal_vm_annotation_ReservedStackAccess;
2063 }
2064 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
2065 if (_location != _in_class) break; // only allow for classes
2066 if (!privileged) break; // only allow in privileged code
2067 return _jdk_internal_ValueBased;
2068 }
2069 default: {
2070 break;
2071 }
2072 }
2073 return AnnotationCollector::_unknown;
2074 }
2075
2076 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2077 if (is_contended())
2078 // Setting the contended group also sets the contended bit in field flags
2079 f->set_contended_group(contended_group());
2080 if (is_stable())
2081 (f->field_flags_addr())->update_stable(true);
2082 }
2083
2084 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2085 // If there's an error deallocate metadata for field annotations
2086 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2087 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2088 }
2089
2090 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2091 if (has_annotation(_method_CallerSensitive))
2092 m->set_caller_sensitive();
2093 if (has_annotation(_method_ForceInline))
2094 m->set_force_inline();
2095 if (has_annotation(_method_DontInline))
2096 m->set_dont_inline();
2097 if (has_annotation(_method_ChangesCurrentThread))
2098 m->set_changes_current_thread();
2099 if (has_annotation(_method_JvmtiMountTransition))
2100 m->set_jvmti_mount_transition();
2101 if (has_annotation(_method_InjectedProfile))
2102 m->set_has_injected_profile();
2103 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2104 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2105 if (has_annotation(_method_Hidden))
2106 m->set_is_hidden();
2107 if (has_annotation(_method_Scoped))
2108 m->set_scoped();
2109 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2110 m->set_intrinsic_candidate();
2111 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2112 m->set_has_reserved_stack_access();
2113 }
2114
2115 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2116 assert(ik != nullptr, "invariant");
2117 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2118 ik->set_is_contended(is_contended());
2119 }
2120 if (has_annotation(_jdk_internal_ValueBased)) {
2121 ik->set_has_value_based_class_annotation();
2122 if (DiagnoseSyncOnValueBasedClasses) {
2123 ik->set_is_value_based();
2124 }
2125 }
2126 }
2127
2128 #define MAX_ARGS_SIZE 255
2129 #define MAX_CODE_SIZE 65535
2130 #define INITIAL_MAX_LVT_NUMBER 256
2131
2132 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2133 *
2134 * Rules for LVT's and LVTT's are:
2135 * - There can be any number of LVT's and LVTT's.
2136 * - If there are n LVT's, it is the same as if there was just
2137 * one LVT containing all the entries from the n LVT's.
2138 * - There may be no more than one LVT entry per local variable.
2139 * Two LVT entries are 'equal' if these fields are the same:
2140 * start_pc, length, name, slot
2141 * - There may be no more than one LVTT entry per each LVT entry.
2142 * Each LVTT entry has to match some LVT entry.
2143 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2144 */
2145 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2146 int lvt_cnt,
2147 u2* const localvariable_table_length,
2148 const unsafe_u2** const localvariable_table_start,
2149 int lvtt_cnt,
2150 u2* const localvariable_type_table_length,
2151 const unsafe_u2** const localvariable_type_table_start,
2152 TRAPS) {
2153
2154 ResourceMark rm(THREAD);
2155
2156 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2157 256, AnyObj::RESOURCE_AREA, mtInternal,
2158 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2159
2160 LVT_HashTable* const table = new LVT_HashTable();
2161
2162 // To fill LocalVariableTable in
2163 const Classfile_LVT_Element* cf_lvt;
2164 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2165
2166 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2167 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2168 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2169 copy_lvt_element(&cf_lvt[idx], lvt);
2170 // If no duplicates, add LVT elem in hashtable.
2171 if (table->put(*lvt, lvt) == false
2172 && _need_verify
2173 && _major_version >= JAVA_1_5_VERSION) {
2174 classfile_parse_error("Duplicated LocalVariableTable attribute "
2175 "entry for '%s' in class file %s",
2176 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2177 THREAD);
2178 return;
2179 }
2180 }
2181 }
2182
2183 // To merge LocalVariableTable and LocalVariableTypeTable
2184 const Classfile_LVT_Element* cf_lvtt;
2185 LocalVariableTableElement lvtt_elem;
2186
2187 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2188 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2189 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2190 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2191 LocalVariableTableElement** entry = table->get(lvtt_elem);
2192 if (entry == nullptr) {
2193 if (_need_verify) {
2194 classfile_parse_error("LVTT entry for '%s' in class file %s "
2195 "does not match any LVT entry",
2196 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2197 THREAD);
2198 return;
2199 }
2200 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2201 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2202 "entry for '%s' in class file %s",
2203 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2204 THREAD);
2205 return;
2206 } else {
2207 // to add generic signatures into LocalVariableTable
2208 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2209 }
2210 }
2211 }
2212 }
2213
2214
2215 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2216 const u1* runtime_visible_annotations,
2217 int runtime_visible_annotations_length,
2218 const u1* runtime_invisible_annotations,
2219 int runtime_invisible_annotations_length,
2220 const u1* runtime_visible_parameter_annotations,
2221 int runtime_visible_parameter_annotations_length,
2222 const u1* runtime_invisible_parameter_annotations,
2223 int runtime_invisible_parameter_annotations_length,
2224 const u1* runtime_visible_type_annotations,
2225 int runtime_visible_type_annotations_length,
2226 const u1* runtime_invisible_type_annotations,
2227 int runtime_invisible_type_annotations_length,
2228 const u1* annotation_default,
2229 int annotation_default_length,
2230 TRAPS) {
2231
2232 AnnotationArray* a;
2233
2234 if (runtime_visible_annotations_length +
2235 runtime_invisible_annotations_length > 0) {
2236 a = assemble_annotations(runtime_visible_annotations,
2237 runtime_visible_annotations_length,
2238 runtime_invisible_annotations,
2239 runtime_invisible_annotations_length,
2240 CHECK);
2241 cm->set_method_annotations(a);
2242 }
2243
2244 if (runtime_visible_parameter_annotations_length +
2245 runtime_invisible_parameter_annotations_length > 0) {
2246 a = assemble_annotations(runtime_visible_parameter_annotations,
2247 runtime_visible_parameter_annotations_length,
2248 runtime_invisible_parameter_annotations,
2249 runtime_invisible_parameter_annotations_length,
2250 CHECK);
2251 cm->set_parameter_annotations(a);
2252 }
2253
2254 if (annotation_default_length > 0) {
2255 a = assemble_annotations(annotation_default,
2256 annotation_default_length,
2257 nullptr,
2258 0,
2259 CHECK);
2260 cm->set_default_annotations(a);
2261 }
2262
2263 if (runtime_visible_type_annotations_length +
2264 runtime_invisible_type_annotations_length > 0) {
2265 a = assemble_annotations(runtime_visible_type_annotations,
2266 runtime_visible_type_annotations_length,
2267 runtime_invisible_type_annotations,
2268 runtime_invisible_type_annotations_length,
2269 CHECK);
2270 cm->set_type_annotations(a);
2271 }
2272 }
2273
2274
2275 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2276 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2277 // Method* to save footprint, so we only know the size of the resulting Method* when the
2278 // entire method attribute is parsed.
2279 //
2280 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2281
2282 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2283 bool is_interface,
2284 bool is_value_class,
2285 bool is_abstract_class,
2286 const ConstantPool* cp,
2287 bool* const has_localvariable_table,
2288 TRAPS) {
2289 assert(cfs != nullptr, "invariant");
2290 assert(cp != nullptr, "invariant");
2291 assert(has_localvariable_table != nullptr, "invariant");
2292
2293 ResourceMark rm(THREAD);
2294 // Parse fixed parts:
2295 // access_flags, name_index, descriptor_index, attributes_count
2296 cfs->guarantee_more(8, CHECK_NULL);
2297
2298 int flags = cfs->get_u2_fast();
2299 const u2 name_index = cfs->get_u2_fast();
2300 const int cp_size = cp->length();
2301 check_property(
2302 valid_symbol_at(name_index),
2303 "Illegal constant pool index %u for method name in class file %s",
2304 name_index, CHECK_NULL);
2305 const Symbol* const name = cp->symbol_at(name_index);
2306 verify_legal_method_name(name, CHECK_NULL);
2307
2308 const u2 signature_index = cfs->get_u2_fast();
2309 guarantee_property(
2310 valid_symbol_at(signature_index),
2311 "Illegal constant pool index %u for method signature in class file %s",
2312 signature_index, CHECK_NULL);
2313 const Symbol* const signature = cp->symbol_at(signature_index);
2314
2315 if (name == vmSymbols::class_initializer_name()) {
2316 // We ignore the other access flags for a valid class initializer.
2317 // (JVM Spec 2nd ed., chapter 4.6)
2318 if (_major_version < 51) { // backward compatibility
2319 flags = JVM_ACC_STATIC;
2320 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2321 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2322 } else {
2323 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2324 return nullptr;
2325 }
2326 } else {
2327 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2328 }
2329
2330 if (EnableValhalla && supports_inline_types() && name == vmSymbols::inline_factory_name()) {
2331 if (is_interface) {
2332 classfile_parse_error("Interface cannot have a method named <vnew>, class file %s", CHECK_NULL);
2333 } else if (!is_value_class) {
2334 classfile_parse_error("Identity class cannot have a method <vnew>, class file %s", CHECK_NULL);
2335 } else if (signature->is_void_method_signature()) {
2336 classfile_parse_error("Factory method <vnew> must have a non-void return type, class file %s", CHECK_NULL);
2337 } else { // also OK, a static factory, as long as the return value is good
2338 bool ok = false;
2339 SignatureStream ss((Symbol*) signature, true);
2340 while (!ss.at_return_type()) ss.next();
2341 if (ss.is_reference()) {
2342 Symbol* ret = ss.as_symbol();
2343 const Symbol* required = class_name();
2344 if (is_hidden()) {
2345 // The original class name for hidden classes changed.
2346 /// So using the original name in the return type is no longer valid.
2347 required = vmSymbols::java_lang_Object();
2348 }
2349 ok = (ret == required);
2350 }
2351 if (!ok) {
2352 throwIllegalSignature("Method", name, signature, CHECK_0);
2353 }
2354 // factory method, with a non-void return. No other
2355 // definition of <vnew> is possible.
2356 //
2357 // The verifier (in verify_invoke_instructions) will inspect the
2358 // signature of any attempt to invoke <vnew>, and ensure that it
2359 // returns non-void.
2360 }
2361 }
2362
2363 if (name == vmSymbols::object_initializer_name()) {
2364 if (is_interface) {
2365 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2366 } else if ((!is_value_class || is_abstract_class) && signature->is_void_method_signature()) {
2367 // OK, a constructor
2368 } else {
2369 // not OK, so throw the same error as in verify_legal_method_signature.
2370 throwIllegalSignature("Method", name, signature, CHECK_0);
2371 }
2372 // A declared <init> method must always be a non-static
2373 // object constructor, with a void return.
2374 //
2375 // The verifier (in verify_invoke_instructions) will inspect the
2376 // signature of any attempt to invoke <init>, and ensure that it
2377 // returns void.
2378 }
2379
2380 if (EnableValhalla) {
2381 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2382 && ((flags & JVM_ACC_STATIC) == 0 )
2383 && !carries_identity_modifier()) {
2384 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2385 return nullptr;
2386 }
2387 }
2388
2389 int args_size = -1; // only used when _need_verify is true
2390 if (_need_verify) {
2391 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2392 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2393 verify_legal_method_signature(name, signature, CHECK_NULL);
2394 if (args_size > MAX_ARGS_SIZE) {
2395 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2396 return nullptr;
2397 }
2398 }
2399
2400 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2401
2402 // Default values for code and exceptions attribute elements
2403 u2 max_stack = 0;
2404 u2 max_locals = 0;
2405 u4 code_length = 0;
2406 const u1* code_start = 0;
2407 u2 exception_table_length = 0;
2408 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2409 Array<int>* exception_handlers = Universe::the_empty_int_array();
2410 u2 checked_exceptions_length = 0;
2411 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2412 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2413 int linenumber_table_length = 0;
2414 int total_lvt_length = 0;
2415 u2 lvt_cnt = 0;
2416 u2 lvtt_cnt = 0;
2417 bool lvt_allocated = false;
2418 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2419 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2420 u2* localvariable_table_length = nullptr;
2421 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2422 u2* localvariable_type_table_length = nullptr;
2423 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2424 int method_parameters_length = -1;
2425 const u1* method_parameters_data = nullptr;
2426 bool method_parameters_seen = false;
2427 bool parsed_code_attribute = false;
2428 bool parsed_checked_exceptions_attribute = false;
2429 bool parsed_stackmap_attribute = false;
2430 // stackmap attribute - JDK1.5
2431 const u1* stackmap_data = nullptr;
2432 int stackmap_data_length = 0;
2433 u2 generic_signature_index = 0;
2434 MethodAnnotationCollector parsed_annotations;
2435 const u1* runtime_visible_annotations = nullptr;
2436 int runtime_visible_annotations_length = 0;
2437 const u1* runtime_invisible_annotations = nullptr;
2438 int runtime_invisible_annotations_length = 0;
2439 const u1* runtime_visible_parameter_annotations = nullptr;
2440 int runtime_visible_parameter_annotations_length = 0;
2441 const u1* runtime_invisible_parameter_annotations = nullptr;
2442 int runtime_invisible_parameter_annotations_length = 0;
2443 const u1* runtime_visible_type_annotations = nullptr;
2444 int runtime_visible_type_annotations_length = 0;
2445 const u1* runtime_invisible_type_annotations = nullptr;
2446 int runtime_invisible_type_annotations_length = 0;
2447 bool runtime_invisible_annotations_exists = false;
2448 bool runtime_invisible_type_annotations_exists = false;
2449 bool runtime_invisible_parameter_annotations_exists = false;
2450 const u1* annotation_default = nullptr;
2451 int annotation_default_length = 0;
2452
2453 // Parse code and exceptions attribute
2454 u2 method_attributes_count = cfs->get_u2_fast();
2455 while (method_attributes_count--) {
2456 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2457 const u2 method_attribute_name_index = cfs->get_u2_fast();
2458 const u4 method_attribute_length = cfs->get_u4_fast();
2459 check_property(
2460 valid_symbol_at(method_attribute_name_index),
2461 "Invalid method attribute name index %u in class file %s",
2462 method_attribute_name_index, CHECK_NULL);
2463
2464 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2465 if (method_attribute_name == vmSymbols::tag_code()) {
2466 // Parse Code attribute
2467 if (_need_verify) {
2468 guarantee_property(
2469 !access_flags.is_native() && !access_flags.is_abstract(),
2470 "Code attribute in native or abstract methods in class file %s",
2471 CHECK_NULL);
2472 }
2473 if (parsed_code_attribute) {
2474 classfile_parse_error("Multiple Code attributes in class file %s",
2475 THREAD);
2476 return nullptr;
2477 }
2478 parsed_code_attribute = true;
2479
2480 // Stack size, locals size, and code size
2481 cfs->guarantee_more(8, CHECK_NULL);
2482 max_stack = cfs->get_u2_fast();
2483 max_locals = cfs->get_u2_fast();
2484 code_length = cfs->get_u4_fast();
2485 if (_need_verify) {
2486 guarantee_property(args_size <= max_locals,
2487 "Arguments can't fit into locals in class file %s",
2488 CHECK_NULL);
2489 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2490 "Invalid method Code length %u in class file %s",
2491 code_length, CHECK_NULL);
2492 }
2493 // Code pointer
2494 code_start = cfs->current();
2495 assert(code_start != nullptr, "null code start");
2496 cfs->guarantee_more(code_length, CHECK_NULL);
2497 cfs->skip_u1_fast(code_length);
2498
2499 // Exception handler table
2500 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2501 exception_table_length = cfs->get_u2_fast();
2502 if (exception_table_length > 0) {
2503 exception_table_start = parse_exception_table(cfs,
2504 code_length,
2505 exception_table_length,
2506 CHECK_NULL);
2507 }
2508
2509 // Parse additional attributes in code attribute
2510 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2511 u2 code_attributes_count = cfs->get_u2_fast();
2512
2513 unsigned int calculated_attribute_length = 0;
2514
2515 calculated_attribute_length =
2516 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2517 calculated_attribute_length +=
2518 code_length +
2519 sizeof(exception_table_length) +
2520 sizeof(code_attributes_count) +
2521 exception_table_length *
2522 ( sizeof(u2) + // start_pc
2523 sizeof(u2) + // end_pc
2524 sizeof(u2) + // handler_pc
2525 sizeof(u2) ); // catch_type_index
2526
2527 while (code_attributes_count--) {
2528 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2529 const u2 code_attribute_name_index = cfs->get_u2_fast();
2530 const u4 code_attribute_length = cfs->get_u4_fast();
2531 calculated_attribute_length += code_attribute_length +
2532 sizeof(code_attribute_name_index) +
2533 sizeof(code_attribute_length);
2534 check_property(valid_symbol_at(code_attribute_name_index),
2535 "Invalid code attribute name index %u in class file %s",
2536 code_attribute_name_index,
2537 CHECK_NULL);
2538 if (LoadLineNumberTables &&
2539 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2540 // Parse and compress line number table
2541 parse_linenumber_table(code_attribute_length,
2542 code_length,
2543 &linenumber_table,
2544 CHECK_NULL);
2545
2546 } else if (LoadLocalVariableTables &&
2547 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2548 // Parse local variable table
2549 if (!lvt_allocated) {
2550 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2551 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2552 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2553 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2554 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2555 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2556 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2557 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2558 lvt_allocated = true;
2559 }
2560 if (lvt_cnt == max_lvt_cnt) {
2561 max_lvt_cnt <<= 1;
2562 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2563 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2564 }
2565 localvariable_table_start[lvt_cnt] =
2566 parse_localvariable_table(cfs,
2567 code_length,
2568 max_locals,
2569 code_attribute_length,
2570 &localvariable_table_length[lvt_cnt],
2571 false, // is not LVTT
2572 CHECK_NULL);
2573 total_lvt_length += localvariable_table_length[lvt_cnt];
2574 lvt_cnt++;
2575 } else if (LoadLocalVariableTypeTables &&
2576 _major_version >= JAVA_1_5_VERSION &&
2577 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2578 if (!lvt_allocated) {
2579 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2580 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2581 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2582 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2583 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2584 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2585 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2586 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2587 lvt_allocated = true;
2588 }
2589 // Parse local variable type table
2590 if (lvtt_cnt == max_lvtt_cnt) {
2591 max_lvtt_cnt <<= 1;
2592 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2593 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2594 }
2595 localvariable_type_table_start[lvtt_cnt] =
2596 parse_localvariable_table(cfs,
2597 code_length,
2598 max_locals,
2599 code_attribute_length,
2600 &localvariable_type_table_length[lvtt_cnt],
2601 true, // is LVTT
2602 CHECK_NULL);
2603 lvtt_cnt++;
2604 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2605 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2606 // Stack map is only needed by the new verifier in JDK1.5.
2607 if (parsed_stackmap_attribute) {
2608 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2609 return nullptr;
2610 }
2611 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2612 stackmap_data_length = code_attribute_length;
2613 parsed_stackmap_attribute = true;
2614 } else {
2615 // Skip unknown attributes
2616 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2617 }
2618 }
2619 // check method attribute length
2620 if (_need_verify) {
2621 guarantee_property(method_attribute_length == calculated_attribute_length,
2622 "Code segment has wrong length in class file %s",
2623 CHECK_NULL);
2624 }
2625 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2626 // Parse Exceptions attribute
2627 if (parsed_checked_exceptions_attribute) {
2628 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2629 THREAD);
2630 return nullptr;
2631 }
2632 parsed_checked_exceptions_attribute = true;
2633 checked_exceptions_start =
2634 parse_checked_exceptions(cfs,
2635 &checked_exceptions_length,
2636 method_attribute_length,
2637 CHECK_NULL);
2638 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2639 // reject multiple method parameters
2640 if (method_parameters_seen) {
2641 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2642 THREAD);
2643 return nullptr;
2644 }
2645 method_parameters_seen = true;
2646 method_parameters_length = cfs->get_u1_fast();
2647 const u2 real_length = (method_parameters_length * 4u) + 1u;
2648 if (method_attribute_length != real_length) {
2649 classfile_parse_error(
2650 "Invalid MethodParameters method attribute length %u in class file",
2651 method_attribute_length, THREAD);
2652 return nullptr;
2653 }
2654 method_parameters_data = cfs->current();
2655 cfs->skip_u2_fast(method_parameters_length);
2656 cfs->skip_u2_fast(method_parameters_length);
2657 // ignore this attribute if it cannot be reflected
2658 if (!vmClasses::Parameter_klass_loaded())
2659 method_parameters_length = -1;
2660 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2661 if (method_attribute_length != 0) {
2662 classfile_parse_error(
2663 "Invalid Synthetic method attribute length %u in class file %s",
2664 method_attribute_length, THREAD);
2665 return nullptr;
2666 }
2667 // Should we check that there hasn't already been a synthetic attribute?
2668 access_flags.set_is_synthetic();
2669 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2670 if (method_attribute_length != 0) {
2671 classfile_parse_error(
2672 "Invalid Deprecated method attribute length %u in class file %s",
2673 method_attribute_length, THREAD);
2674 return nullptr;
2675 }
2676 } else if (_major_version >= JAVA_1_5_VERSION) {
2677 if (method_attribute_name == vmSymbols::tag_signature()) {
2678 if (generic_signature_index != 0) {
2679 classfile_parse_error(
2680 "Multiple Signature attributes for method in class file %s",
2681 THREAD);
2682 return nullptr;
2683 }
2684 if (method_attribute_length != 2) {
2685 classfile_parse_error(
2686 "Invalid Signature attribute length %u in class file %s",
2687 method_attribute_length, THREAD);
2688 return nullptr;
2689 }
2690 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2691 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2692 if (runtime_visible_annotations != nullptr) {
2693 classfile_parse_error(
2694 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2695 THREAD);
2696 return nullptr;
2697 }
2698 runtime_visible_annotations_length = method_attribute_length;
2699 runtime_visible_annotations = cfs->current();
2700 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2701 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2702 parse_annotations(cp,
2703 runtime_visible_annotations,
2704 runtime_visible_annotations_length,
2705 &parsed_annotations,
2706 _loader_data,
2707 _can_access_vm_annotations);
2708 cfs->skip_u1_fast(runtime_visible_annotations_length);
2709 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2710 if (runtime_invisible_annotations_exists) {
2711 classfile_parse_error(
2712 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2713 THREAD);
2714 return nullptr;
2715 }
2716 runtime_invisible_annotations_exists = true;
2717 if (PreserveAllAnnotations) {
2718 runtime_invisible_annotations_length = method_attribute_length;
2719 runtime_invisible_annotations = cfs->current();
2720 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
2721 }
2722 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2723 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2724 if (runtime_visible_parameter_annotations != nullptr) {
2725 classfile_parse_error(
2726 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2727 THREAD);
2728 return nullptr;
2729 }
2730 runtime_visible_parameter_annotations_length = method_attribute_length;
2731 runtime_visible_parameter_annotations = cfs->current();
2732 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2733 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2734 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2735 if (runtime_invisible_parameter_annotations_exists) {
2736 classfile_parse_error(
2737 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2738 THREAD);
2739 return nullptr;
2740 }
2741 runtime_invisible_parameter_annotations_exists = true;
2742 if (PreserveAllAnnotations) {
2743 runtime_invisible_parameter_annotations_length = method_attribute_length;
2744 runtime_invisible_parameter_annotations = cfs->current();
2745 assert(runtime_invisible_parameter_annotations != nullptr,
2746 "null invisible parameter annotations");
2747 }
2748 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2749 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2750 if (annotation_default != nullptr) {
2751 classfile_parse_error(
2752 "Multiple AnnotationDefault attributes for method in class file %s",
2753 THREAD);
2754 return nullptr;
2755 }
2756 annotation_default_length = method_attribute_length;
2757 annotation_default = cfs->current();
2758 assert(annotation_default != nullptr, "null annotation default");
2759 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2760 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2761 if (runtime_visible_type_annotations != nullptr) {
2762 classfile_parse_error(
2763 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2764 THREAD);
2765 return nullptr;
2766 }
2767 runtime_visible_type_annotations_length = method_attribute_length;
2768 runtime_visible_type_annotations = cfs->current();
2769 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2770 // No need for the VM to parse Type annotations
2771 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2772 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2773 if (runtime_invisible_type_annotations_exists) {
2774 classfile_parse_error(
2775 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2776 THREAD);
2777 return nullptr;
2778 } else {
2779 runtime_invisible_type_annotations_exists = true;
2780 }
2781 if (PreserveAllAnnotations) {
2782 runtime_invisible_type_annotations_length = method_attribute_length;
2783 runtime_invisible_type_annotations = cfs->current();
2784 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
2785 }
2786 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2787 } else {
2788 // Skip unknown attributes
2789 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2790 }
2791 } else {
2792 // Skip unknown attributes
2793 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2794 }
2795 }
2796
2797 if (linenumber_table != nullptr) {
2798 linenumber_table->write_terminator();
2799 linenumber_table_length = linenumber_table->position();
2800 }
2801
2802 // Make sure there's at least one Code attribute in non-native/non-abstract method
2803 if (_need_verify) {
2804 guarantee_property(access_flags.is_native() ||
2805 access_flags.is_abstract() ||
2806 parsed_code_attribute,
2807 "Absent Code attribute in method that is not native or abstract in class file %s",
2808 CHECK_NULL);
2809 }
2810
2811 // All sizing information for a Method* is finally available, now create it
2812 InlineTableSizes sizes(
2813 total_lvt_length,
2814 linenumber_table_length,
2815 exception_table_length,
2816 checked_exceptions_length,
2817 method_parameters_length,
2818 generic_signature_index,
2819 runtime_visible_annotations_length +
2820 runtime_invisible_annotations_length,
2821 runtime_visible_parameter_annotations_length +
2822 runtime_invisible_parameter_annotations_length,
2823 runtime_visible_type_annotations_length +
2824 runtime_invisible_type_annotations_length,
2825 annotation_default_length,
2826 0);
2827
2828 Method* const m = Method::allocate(_loader_data,
2829 code_length,
2830 access_flags,
2831 &sizes,
2832 ConstMethod::NORMAL,
2833 _cp->symbol_at(name_index),
2834 CHECK_NULL);
2835
2836 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2837
2838 // Fill in information from fixed part (access_flags already set)
2839 m->set_constants(_cp);
2840 m->set_name_index(name_index);
2841 m->set_signature_index(signature_index);
2842 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2843 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2844
2845 // Fill in code attribute information
2846 m->set_max_stack(max_stack);
2847 m->set_max_locals(max_locals);
2848 if (stackmap_data != nullptr) {
2849 m->constMethod()->copy_stackmap_data(_loader_data,
2850 (u1*)stackmap_data,
2851 stackmap_data_length,
2852 CHECK_NULL);
2853 }
2854
2855 // Copy byte codes
2856 m->set_code((u1*)code_start);
2857
2858 // Copy line number table
2859 if (linenumber_table != nullptr) {
2860 memcpy(m->compressed_linenumber_table(),
2861 linenumber_table->buffer(),
2862 linenumber_table_length);
2863 }
2864
2865 // Copy exception table
2866 if (exception_table_length > 0) {
2867 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2868 m->exception_table_start(),
2869 exception_table_length * sizeof(ExceptionTableElement),
2870 sizeof(u2));
2871 }
2872
2873 // Copy method parameters
2874 if (method_parameters_length > 0) {
2875 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2876 for (int i = 0; i < method_parameters_length; i++) {
2877 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2878 method_parameters_data += 2;
2879 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2880 method_parameters_data += 2;
2881 }
2882 }
2883
2884 // Copy checked exceptions
2885 if (checked_exceptions_length > 0) {
2886 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2887 m->checked_exceptions_start(),
2888 checked_exceptions_length * sizeof(CheckedExceptionElement),
2889 sizeof(u2));
2890 }
2891
2892 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2893 if (total_lvt_length > 0) {
2894 *has_localvariable_table = true;
2895 copy_localvariable_table(m->constMethod(),
2896 lvt_cnt,
2897 localvariable_table_length,
2898 localvariable_table_start,
2899 lvtt_cnt,
2900 localvariable_type_table_length,
2901 localvariable_type_table_start,
2902 CHECK_NULL);
2903 }
2904
2905 if (parsed_annotations.has_any_annotations())
2906 parsed_annotations.apply_to(methodHandle(THREAD, m));
2907
2908 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2909 m->set_is_hidden();
2910 }
2911
2912 // Copy annotations
2913 copy_method_annotations(m->constMethod(),
2914 runtime_visible_annotations,
2915 runtime_visible_annotations_length,
2916 runtime_invisible_annotations,
2917 runtime_invisible_annotations_length,
2918 runtime_visible_parameter_annotations,
2919 runtime_visible_parameter_annotations_length,
2920 runtime_invisible_parameter_annotations,
2921 runtime_invisible_parameter_annotations_length,
2922 runtime_visible_type_annotations,
2923 runtime_visible_type_annotations_length,
2924 runtime_invisible_type_annotations,
2925 runtime_invisible_type_annotations_length,
2926 annotation_default,
2927 annotation_default_length,
2928 CHECK_NULL);
2929
2930 if (InstanceKlass::is_finalization_enabled() &&
2931 name == vmSymbols::finalize_method_name() &&
2932 signature == vmSymbols::void_method_signature()) {
2933 if (m->is_empty_method()) {
2934 _has_empty_finalizer = true;
2935 } else {
2936 _has_finalizer = true;
2937 }
2938 }
2939 if (name == vmSymbols::object_initializer_name() &&
2940 signature == vmSymbols::void_method_signature() &&
2941 m->is_vanilla_constructor()) {
2942 _has_vanilla_constructor = true;
2943 }
2944
2945 NOT_PRODUCT(m->verify());
2946 return m;
2947 }
2948
2949
2950 // Side-effects: populates the _methods field in the parser
2951 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2952 bool is_interface,
2953 bool is_value_class,
2954 bool is_abstract_type,
2955 bool* const has_localvariable_table,
2956 bool* has_final_method,
2957 bool* declares_nonstatic_concrete_methods,
2958 TRAPS) {
2959 assert(cfs != nullptr, "invariant");
2960 assert(has_localvariable_table != nullptr, "invariant");
2961 assert(has_final_method != nullptr, "invariant");
2962 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2963
2964 assert(nullptr == _methods, "invariant");
2965
2966 cfs->guarantee_more(2, CHECK); // length
2967 const u2 length = cfs->get_u2_fast();
2968 if (length == 0) {
2969 _methods = Universe::the_empty_method_array();
2970 } else {
2971 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2972 length,
2973 nullptr,
2974 CHECK);
2975
2976 for (int index = 0; index < length; index++) {
2977 Method* method = parse_method(cfs,
2978 is_interface,
2979 is_value_class,
2980 is_abstract_type,
2981 _cp,
2982 has_localvariable_table,
2983 CHECK);
2984
2985 if (method->is_final()) {
2986 *has_final_method = true;
2987 }
2988 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2989 // used for interface initialization, and default method inheritance analysis
2990 if (is_interface && !(*declares_nonstatic_concrete_methods)
2991 && !method->is_abstract() && !method->is_static()) {
2992 *declares_nonstatic_concrete_methods = true;
2993 }
2994 _methods->at_put(index, method);
2995 }
2996
2997 if (_need_verify && length > 1) {
2998 // Check duplicated methods
2999 ResourceMark rm(THREAD);
3000 // Set containing name-signature pairs
3001 NameSigHashtable* names_and_sigs = new NameSigHashtable();
3002 for (int i = 0; i < length; i++) {
3003 const Method* const m = _methods->at(i);
3004 NameSigHash name_and_sig(m->name(), m->signature());
3005 // If no duplicates, add name/signature in hashtable names_and_sigs.
3006 if(!names_and_sigs->put(name_and_sig, 0)) {
3007 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3008 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
3009 return;
3010 }
3011 }
3012 }
3013 }
3014 }
3015
3016 static const intArray* sort_methods(Array<Method*>* methods) {
3017 const int length = methods->length();
3018 // If JVMTI original method ordering or sharing is enabled we have to
3019 // remember the original class file ordering.
3020 // We temporarily use the vtable_index field in the Method* to store the
3021 // class file index, so we can read in after calling qsort.
3022 // Put the method ordering in the shared archive.
3023 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3024 for (int index = 0; index < length; index++) {
3025 Method* const m = methods->at(index);
3026 assert(!m->valid_vtable_index(), "vtable index should not be set");
3027 m->set_vtable_index(index);
3028 }
3029 }
3030 // Sort method array by ascending method name (for faster lookups & vtable construction)
3031 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3032 Method::sort_methods(methods);
3033
3034 intArray* method_ordering = nullptr;
3035 // If JVMTI original method ordering or sharing is enabled construct int
3036 // array remembering the original ordering
3037 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3038 method_ordering = new intArray(length, length, -1);
3039 for (int index = 0; index < length; index++) {
3040 Method* const m = methods->at(index);
3041 const int old_index = m->vtable_index();
3042 assert(old_index >= 0 && old_index < length, "invalid method index");
3043 method_ordering->at_put(index, old_index);
3044 m->set_vtable_index(Method::invalid_vtable_index);
3045 }
3046 }
3047 return method_ordering;
3048 }
3049
3050 // Parse generic_signature attribute for methods and fields
3051 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3052 TRAPS) {
3053 assert(cfs != nullptr, "invariant");
3054
3055 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3056 const u2 generic_signature_index = cfs->get_u2_fast();
3057 check_property(
3058 valid_symbol_at(generic_signature_index),
3059 "Invalid Signature attribute at constant pool index %u in class file %s",
3060 generic_signature_index, CHECK_0);
3061 return generic_signature_index;
3062 }
3063
3064 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3065 TRAPS) {
3066
3067 assert(cfs != nullptr, "invariant");
3068
3069 cfs->guarantee_more(2, CHECK); // sourcefile_index
3070 const u2 sourcefile_index = cfs->get_u2_fast();
3071 check_property(
3072 valid_symbol_at(sourcefile_index),
3073 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3074 sourcefile_index, CHECK);
3075 set_class_sourcefile_index(sourcefile_index);
3076 }
3077
3078 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3079 int length,
3080 TRAPS) {
3081 assert(cfs != nullptr, "invariant");
3082
3083 const u1* const sde_buffer = cfs->current();
3084 assert(sde_buffer != nullptr, "null sde buffer");
3085
3086 // Don't bother storing it if there is no way to retrieve it
3087 if (JvmtiExport::can_get_source_debug_extension()) {
3088 assert((length+1) > length, "Overflow checking");
3089 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3090 for (int i = 0; i < length; i++) {
3091 sde[i] = sde_buffer[i];
3092 }
3093 sde[length] = '\0';
3094 set_class_sde_buffer((const char*)sde, length);
3095 }
3096 // Got utf8 string, set stream position forward
3097 cfs->skip_u1(length, CHECK);
3098 }
3099
3100
3101 // Inner classes can be static, private or protected (classic VM does this)
3102 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3103 JVM_ACC_PRIVATE | \
3104 JVM_ACC_PROTECTED | \
3105 JVM_ACC_STATIC \
3106 )
3107
3108 // Find index of the InnerClasses entry for the specified inner_class_info_index.
3109 // Return -1 if none is found.
3110 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3111 Symbol* cp_klass_name = cp->klass_name_at(inner);
3112 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3113 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3114 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3115 return idx;
3116 }
3117 }
3118 return -1;
3119 }
3120
3121 // Return the outer_class_info_index for the InnerClasses entry containing the
3122 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
3123 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3124 if (inner == 0) return -1;
3125 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3126 if (idx == -1) return -1;
3127 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3128 return result;
3129 }
3130
3131 // Return true if circularity is found, false if no circularity is found.
3132 // Use Floyd's cycle finding algorithm.
3133 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3134 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3135 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3136
3137 while (fast != -1 && fast != 0) {
3138 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3139 return true; // found a circularity
3140 }
3141 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3142 if (fast == -1) return false;
3143 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3144 if (fast == -1) return false;
3145 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3146 assert(slow != -1, "sanity check");
3147 }
3148 return false;
3149 }
3150
3151 // Loop through each InnerClasses entry checking for circularities and duplications
3152 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3153 // return true if a circularity or entries with duplicate inner_class_info_indexes
3154 // are found.
3155 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3156 // Loop through each InnerClasses entry.
3157 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3158 // Return true if there are circular entries.
3159 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3160 return true;
3161 }
3162 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3163 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3164 y += InstanceKlass::inner_class_next_offset) {
3165
3166 // 4347400: make sure there's no duplicate entry in the classes array
3167 if (_major_version >= JAVA_1_5_VERSION) {
3168 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3169 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3170 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3171 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3172 "Duplicate entry in InnerClasses attribute in class file %s",
3173 CHECK_(true));
3174 }
3175 // Return true if there are two entries with the same inner_class_info_index.
3176 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3177 return true;
3178 }
3179 }
3180 }
3181 return false;
3182 }
3183
3184 // Return number of classes in the inner classes attribute table
3185 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3186 const ConstantPool* cp,
3187 const u1* const inner_classes_attribute_start,
3188 bool parsed_enclosingmethod_attribute,
3189 u2 enclosing_method_class_index,
3190 u2 enclosing_method_method_index,
3191 TRAPS) {
3192 const u1* const current_mark = cfs->current();
3193 u2 length = 0;
3194 if (inner_classes_attribute_start != nullptr) {
3195 cfs->set_current(inner_classes_attribute_start);
3196 cfs->guarantee_more(2, CHECK_0); // length
3197 length = cfs->get_u2_fast();
3198 }
3199
3200 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3201 // method data:
3202 // [inner_class_info_index,
3203 // outer_class_info_index,
3204 // inner_name_index,
3205 // inner_class_access_flags,
3206 // ...
3207 // enclosing_method_class_index,
3208 // enclosing_method_method_index]
3209 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3210 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3211 _inner_classes = inner_classes;
3212
3213 int index = 0;
3214 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3215 for (int n = 0; n < length; n++) {
3216 // Inner class index
3217 const u2 inner_class_info_index = cfs->get_u2_fast();
3218 check_property(
3219 valid_klass_reference_at(inner_class_info_index),
3220 "inner_class_info_index %u has bad constant type in class file %s",
3221 inner_class_info_index, CHECK_0);
3222 // Outer class index
3223 const u2 outer_class_info_index = cfs->get_u2_fast();
3224 check_property(
3225 outer_class_info_index == 0 ||
3226 valid_klass_reference_at(outer_class_info_index),
3227 "outer_class_info_index %u has bad constant type in class file %s",
3228 outer_class_info_index, CHECK_0);
3229
3230 if (outer_class_info_index != 0) {
3231 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3232 char* bytes = (char*)outer_class_name->bytes();
3233 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3234 "Outer class is an array class in class file %s", CHECK_0);
3235 }
3236 // Inner class name
3237 const u2 inner_name_index = cfs->get_u2_fast();
3238 check_property(
3239 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3240 "inner_name_index %u has bad constant type in class file %s",
3241 inner_name_index, CHECK_0);
3242 if (_need_verify) {
3243 guarantee_property(inner_class_info_index != outer_class_info_index,
3244 "Class is both outer and inner class in class file %s", CHECK_0);
3245 }
3246
3247 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3248 // JVM_ACC_MODULE is defined in JDK-9 and later.
3249 if (_major_version >= JAVA_9_VERSION) {
3250 recognized_modifiers |= JVM_ACC_MODULE;
3251 }
3252 if (supports_inline_types()) {
3253 recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE | JVM_ACC_IDENTITY;
3254 }
3255
3256 // Access flags
3257 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3258
3259 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3260 // Set abstract bit for old class files for backward compatibility
3261 flags |= JVM_ACC_ABSTRACT;
3262 }
3263
3264 if (EnableValhalla) {
3265 if (!supports_inline_types()) {
3266 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3267 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3268 if (!is_module && !is_interface) {
3269 flags |= JVM_ACC_IDENTITY;
3270 }
3271 }
3272 }
3273
3274 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3275 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3276 AccessFlags inner_access_flags(flags);
3277
3278 inner_classes->at_put(index++, inner_class_info_index);
3279 inner_classes->at_put(index++, outer_class_info_index);
3280 inner_classes->at_put(index++, inner_name_index);
3281 inner_classes->at_put(index++, inner_access_flags.as_short());
3282 }
3283
3284 // Check for circular and duplicate entries.
3285 bool has_circularity = false;
3286 if (_need_verify) {
3287 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3288 if (has_circularity) {
3289 // If circularity check failed then ignore InnerClasses attribute.
3290 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3291 index = 0;
3292 if (parsed_enclosingmethod_attribute) {
3293 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3294 _inner_classes = inner_classes;
3295 } else {
3296 _inner_classes = Universe::the_empty_short_array();
3297 }
3298 }
3299 }
3300 // Set EnclosingMethod class and method indexes.
3301 if (parsed_enclosingmethod_attribute) {
3302 inner_classes->at_put(index++, enclosing_method_class_index);
3303 inner_classes->at_put(index++, enclosing_method_method_index);
3304 }
3305 assert(index == size || has_circularity, "wrong size");
3306
3307 // Restore buffer's current position.
3308 cfs->set_current(current_mark);
3309
3310 return length;
3311 }
3312
3313 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3314 const u1* const nest_members_attribute_start,
3315 TRAPS) {
3316 const u1* const current_mark = cfs->current();
3317 u2 length = 0;
3318 if (nest_members_attribute_start != nullptr) {
3319 cfs->set_current(nest_members_attribute_start);
3320 cfs->guarantee_more(2, CHECK_0); // length
3321 length = cfs->get_u2_fast();
3322 }
3323 const int size = length;
3324 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3325 _nest_members = nest_members;
3326
3327 int index = 0;
3328 cfs->guarantee_more(2 * length, CHECK_0);
3329 for (int n = 0; n < length; n++) {
3330 const u2 class_info_index = cfs->get_u2_fast();
3331 check_property(
3332 valid_klass_reference_at(class_info_index),
3333 "Nest member class_info_index %u has bad constant type in class file %s",
3334 class_info_index, CHECK_0);
3335 nest_members->at_put(index++, class_info_index);
3336 }
3337 assert(index == size, "wrong size");
3338
3339 // Restore buffer's current position.
3340 cfs->set_current(current_mark);
3341
3342 return length;
3343 }
3344
3345 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3346 const u1* const permitted_subclasses_attribute_start,
3347 TRAPS) {
3348 const u1* const current_mark = cfs->current();
3349 u2 length = 0;
3350 if (permitted_subclasses_attribute_start != nullptr) {
3351 cfs->set_current(permitted_subclasses_attribute_start);
3352 cfs->guarantee_more(2, CHECK_0); // length
3353 length = cfs->get_u2_fast();
3354 }
3355 const int size = length;
3356 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3357 _permitted_subclasses = permitted_subclasses;
3358
3359 if (length > 0) {
3360 int index = 0;
3361 cfs->guarantee_more(2 * length, CHECK_0);
3362 for (int n = 0; n < length; n++) {
3363 const u2 class_info_index = cfs->get_u2_fast();
3364 check_property(
3365 valid_klass_reference_at(class_info_index),
3366 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3367 class_info_index, CHECK_0);
3368 permitted_subclasses->at_put(index++, class_info_index);
3369 }
3370 assert(index == size, "wrong size");
3371 }
3372
3373 // Restore buffer's current position.
3374 cfs->set_current(current_mark);
3375
3376 return length;
3377 }
3378
3379 u2 ClassFileParser::parse_classfile_preload_attribute(const ClassFileStream* const cfs,
3380 const u1* const preload_attribute_start,
3381 TRAPS) {
3382 const u1* const current_mark = cfs->current();
3383 u2 length = 0;
3384 if (preload_attribute_start != nullptr) {
3385 cfs->set_current(preload_attribute_start);
3386 cfs->guarantee_more(2, CHECK_0); // length
3387 length = cfs->get_u2_fast();
3388 }
3389 const int size = length;
3390 Array<u2>* const preload_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3391 _preload_classes = preload_classes;
3392 if (length > 0) {
3393 int index = 0;
3394 cfs->guarantee_more(2 * length, CHECK_0);
3395 for (int n = 0; n < length; n++) {
3396 const u2 class_info_index = cfs->get_u2_fast();
3397 check_property(
3398 valid_klass_reference_at(class_info_index),
3399 "Preload class_info_index %u has bad constant type in class file %s",
3400 class_info_index, CHECK_0);
3401 preload_classes->at_put(index++, class_info_index);
3402 }
3403 assert(index == size, "wrong size");
3404 }
3405
3406 // Restore buffer's current position.
3407 cfs->set_current(current_mark);
3408
3409 return length;
3410 }
3411
3412 // Record {
3413 // u2 attribute_name_index;
3414 // u4 attribute_length;
3415 // u2 components_count;
3416 // component_info components[components_count];
3417 // }
3418 // component_info {
3419 // u2 name_index;
3420 // u2 descriptor_index
3421 // u2 attributes_count;
3422 // attribute_info_attributes[attributes_count];
3423 // }
3424 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3425 const ConstantPool* cp,
3426 const u1* const record_attribute_start,
3427 TRAPS) {
3428 const u1* const current_mark = cfs->current();
3429 int components_count = 0;
3430 unsigned int calculate_attr_size = 0;
3431 if (record_attribute_start != nullptr) {
3432 cfs->set_current(record_attribute_start);
3433 cfs->guarantee_more(2, CHECK_0); // num of components
3434 components_count = (int)cfs->get_u2_fast();
3435 calculate_attr_size = 2;
3436 }
3437
3438 Array<RecordComponent*>* const record_components =
3439 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3440 _record_components = record_components;
3441
3442 for (int x = 0; x < components_count; x++) {
3443 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3444
3445 const u2 name_index = cfs->get_u2_fast();
3446 check_property(valid_symbol_at(name_index),
3447 "Invalid constant pool index %u for name in Record attribute in class file %s",
3448 name_index, CHECK_0);
3449 const Symbol* const name = cp->symbol_at(name_index);
3450 verify_legal_field_name(name, CHECK_0);
3451
3452 const u2 descriptor_index = cfs->get_u2_fast();
3453 check_property(valid_symbol_at(descriptor_index),
3454 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3455 descriptor_index, CHECK_0);
3456 const Symbol* const descr = cp->symbol_at(descriptor_index);
3457 verify_legal_field_signature(name, descr, CHECK_0);
3458
3459 const u2 attributes_count = cfs->get_u2_fast();
3460 calculate_attr_size += 6;
3461 u2 generic_sig_index = 0;
3462 const u1* runtime_visible_annotations = nullptr;
3463 int runtime_visible_annotations_length = 0;
3464 const u1* runtime_invisible_annotations = nullptr;
3465 int runtime_invisible_annotations_length = 0;
3466 bool runtime_invisible_annotations_exists = false;
3467 const u1* runtime_visible_type_annotations = nullptr;
3468 int runtime_visible_type_annotations_length = 0;
3469 const u1* runtime_invisible_type_annotations = nullptr;
3470 int runtime_invisible_type_annotations_length = 0;
3471 bool runtime_invisible_type_annotations_exists = false;
3472
3473 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3474 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3475 for (int y = 0; y < attributes_count; y++) {
3476 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3477 const u2 attribute_name_index = cfs->get_u2_fast();
3478 const u4 attribute_length = cfs->get_u4_fast();
3479 calculate_attr_size += 6;
3480 check_property(
3481 valid_symbol_at(attribute_name_index),
3482 "Invalid Record attribute name index %u in class file %s",
3483 attribute_name_index, CHECK_0);
3484
3485 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3486 if (attribute_name == vmSymbols::tag_signature()) {
3487 if (generic_sig_index != 0) {
3488 classfile_parse_error(
3489 "Multiple Signature attributes for Record component in class file %s",
3490 THREAD);
3491 return 0;
3492 }
3493 if (attribute_length != 2) {
3494 classfile_parse_error(
3495 "Invalid Signature attribute length %u in Record component in class file %s",
3496 attribute_length, THREAD);
3497 return 0;
3498 }
3499 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3500
3501 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3502 if (runtime_visible_annotations != nullptr) {
3503 classfile_parse_error(
3504 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3505 return 0;
3506 }
3507 runtime_visible_annotations_length = attribute_length;
3508 runtime_visible_annotations = cfs->current();
3509
3510 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3511 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3512 cfs->skip_u1_fast(runtime_visible_annotations_length);
3513
3514 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3515 if (runtime_invisible_annotations_exists) {
3516 classfile_parse_error(
3517 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3518 return 0;
3519 }
3520 runtime_invisible_annotations_exists = true;
3521 if (PreserveAllAnnotations) {
3522 runtime_invisible_annotations_length = attribute_length;
3523 runtime_invisible_annotations = cfs->current();
3524 assert(runtime_invisible_annotations != nullptr, "null record component invisible annotation");
3525 }
3526 cfs->skip_u1(attribute_length, CHECK_0);
3527
3528 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3529 if (runtime_visible_type_annotations != nullptr) {
3530 classfile_parse_error(
3531 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3532 return 0;
3533 }
3534 runtime_visible_type_annotations_length = attribute_length;
3535 runtime_visible_type_annotations = cfs->current();
3536
3537 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3538 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3539 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3540
3541 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3542 if (runtime_invisible_type_annotations_exists) {
3543 classfile_parse_error(
3544 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3545 return 0;
3546 }
3547 runtime_invisible_type_annotations_exists = true;
3548 if (PreserveAllAnnotations) {
3549 runtime_invisible_type_annotations_length = attribute_length;
3550 runtime_invisible_type_annotations = cfs->current();
3551 assert(runtime_invisible_type_annotations != nullptr, "null record component invisible type annotation");
3552 }
3553 cfs->skip_u1(attribute_length, CHECK_0);
3554
3555 } else {
3556 // Skip unknown attributes
3557 cfs->skip_u1(attribute_length, CHECK_0);
3558 }
3559 calculate_attr_size += attribute_length;
3560 } // End of attributes For loop
3561
3562 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3563 runtime_visible_annotations_length,
3564 runtime_invisible_annotations,
3565 runtime_invisible_annotations_length,
3566 CHECK_0);
3567 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3568 runtime_visible_type_annotations_length,
3569 runtime_invisible_type_annotations,
3570 runtime_invisible_type_annotations_length,
3571 CHECK_0);
3572
3573 RecordComponent* record_component =
3574 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3575 attributes_count, generic_sig_index,
3576 annotations, type_annotations, CHECK_0);
3577 record_components->at_put(x, record_component);
3578 } // End of component processing loop
3579
3580 // Restore buffer's current position.
3581 cfs->set_current(current_mark);
3582 return calculate_attr_size;
3583 }
3584
3585 void ClassFileParser::parse_classfile_synthetic_attribute() {
3586 set_class_synthetic_flag(true);
3587 }
3588
3589 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3590 assert(cfs != nullptr, "invariant");
3591
3592 const u2 signature_index = cfs->get_u2(CHECK);
3593 check_property(
3594 valid_symbol_at(signature_index),
3595 "Invalid constant pool index %u in Signature attribute in class file %s",
3596 signature_index, CHECK);
3597 set_class_generic_signature_index(signature_index);
3598 }
3599
3600 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3601 ConstantPool* cp,
3602 u4 attribute_byte_length,
3603 TRAPS) {
3604 assert(cfs != nullptr, "invariant");
3605 assert(cp != nullptr, "invariant");
3606
3607 const u1* const current_start = cfs->current();
3608
3609 guarantee_property(attribute_byte_length >= sizeof(u2),
3610 "Invalid BootstrapMethods attribute length %u in class file %s",
3611 attribute_byte_length,
3612 CHECK);
3613
3614 cfs->guarantee_more(attribute_byte_length, CHECK);
3615
3616 const int attribute_array_length = cfs->get_u2_fast();
3617
3618 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3619 "Short length on BootstrapMethods in class file %s",
3620 CHECK);
3621
3622
3623 // The attribute contains a counted array of counted tuples of shorts,
3624 // represending bootstrap specifiers:
3625 // length*{bootstrap_method_index, argument_count*{argument_index}}
3626 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3627 // operand_count = number of shorts in attr, except for leading length
3628
3629 // The attribute is copied into a short[] array.
3630 // The array begins with a series of short[2] pairs, one for each tuple.
3631 const int index_size = (attribute_array_length * 2);
3632
3633 Array<u2>* const operands =
3634 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3635
3636 // Eagerly assign operands so they will be deallocated with the constant
3637 // pool if there is an error.
3638 cp->set_operands(operands);
3639
3640 int operand_fill_index = index_size;
3641 const int cp_size = cp->length();
3642
3643 for (int n = 0; n < attribute_array_length; n++) {
3644 // Store a 32-bit offset into the header of the operand array.
3645 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3646
3647 // Read a bootstrap specifier.
3648 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3649 const u2 bootstrap_method_index = cfs->get_u2_fast();
3650 const u2 argument_count = cfs->get_u2_fast();
3651 check_property(
3652 valid_cp_range(bootstrap_method_index, cp_size) &&
3653 cp->tag_at(bootstrap_method_index).is_method_handle(),
3654 "bootstrap_method_index %u has bad constant type in class file %s",
3655 bootstrap_method_index,
3656 CHECK);
3657
3658 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3659 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3660 CHECK);
3661
3662 operands->at_put(operand_fill_index++, bootstrap_method_index);
3663 operands->at_put(operand_fill_index++, argument_count);
3664
3665 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3666 for (int j = 0; j < argument_count; j++) {
3667 const u2 argument_index = cfs->get_u2_fast();
3668 check_property(
3669 valid_cp_range(argument_index, cp_size) &&
3670 cp->tag_at(argument_index).is_loadable_constant(),
3671 "argument_index %u has bad constant type in class file %s",
3672 argument_index,
3673 CHECK);
3674 operands->at_put(operand_fill_index++, argument_index);
3675 }
3676 }
3677 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3678 "Bad length on BootstrapMethods in class file %s",
3679 CHECK);
3680 }
3681
3682 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3683 ConstantPool* cp,
3684 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3685 TRAPS) {
3686 assert(cfs != nullptr, "invariant");
3687 assert(cp != nullptr, "invariant");
3688 assert(parsed_annotations != nullptr, "invariant");
3689
3690 // Set inner classes attribute to default sentinel
3691 _inner_classes = Universe::the_empty_short_array();
3692 // Set nest members attribute to default sentinel
3693 _nest_members = Universe::the_empty_short_array();
3694 // Set _permitted_subclasses attribute to default sentinel
3695 _permitted_subclasses = Universe::the_empty_short_array();
3696 // Set _preload_classes attribute to default sentinel
3697 _preload_classes = Universe::the_empty_short_array();
3698 cfs->guarantee_more(2, CHECK); // attributes_count
3699 u2 attributes_count = cfs->get_u2_fast();
3700 bool parsed_sourcefile_attribute = false;
3701 bool parsed_innerclasses_attribute = false;
3702 bool parsed_nest_members_attribute = false;
3703 bool parsed_permitted_subclasses_attribute = false;
3704 bool parsed_preload_attribute = false;
3705 bool parsed_nest_host_attribute = false;
3706 bool parsed_record_attribute = false;
3707 bool parsed_enclosingmethod_attribute = false;
3708 bool parsed_bootstrap_methods_attribute = false;
3709 const u1* runtime_visible_annotations = nullptr;
3710 int runtime_visible_annotations_length = 0;
3711 const u1* runtime_invisible_annotations = nullptr;
3712 int runtime_invisible_annotations_length = 0;
3713 const u1* runtime_visible_type_annotations = nullptr;
3714 int runtime_visible_type_annotations_length = 0;
3715 const u1* runtime_invisible_type_annotations = nullptr;
3716 int runtime_invisible_type_annotations_length = 0;
3717 bool runtime_invisible_type_annotations_exists = false;
3718 bool runtime_invisible_annotations_exists = false;
3719 bool parsed_source_debug_ext_annotations_exist = false;
3720 const u1* inner_classes_attribute_start = nullptr;
3721 u4 inner_classes_attribute_length = 0;
3722 u2 enclosing_method_class_index = 0;
3723 u2 enclosing_method_method_index = 0;
3724 const u1* nest_members_attribute_start = nullptr;
3725 u4 nest_members_attribute_length = 0;
3726 const u1* record_attribute_start = nullptr;
3727 u4 record_attribute_length = 0;
3728 const u1* permitted_subclasses_attribute_start = nullptr;
3729 u4 permitted_subclasses_attribute_length = 0;
3730 const u1* preload_attribute_start = nullptr;
3731 u4 preload_attribute_length = 0;
3732
3733 // Iterate over attributes
3734 while (attributes_count--) {
3735 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3736 const u2 attribute_name_index = cfs->get_u2_fast();
3737 const u4 attribute_length = cfs->get_u4_fast();
3738 check_property(
3739 valid_symbol_at(attribute_name_index),
3740 "Attribute name has bad constant pool index %u in class file %s",
3741 attribute_name_index, CHECK);
3742 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3743 if (tag == vmSymbols::tag_source_file()) {
3744 // Check for SourceFile tag
3745 if (_need_verify) {
3746 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3747 }
3748 if (parsed_sourcefile_attribute) {
3749 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3750 return;
3751 } else {
3752 parsed_sourcefile_attribute = true;
3753 }
3754 parse_classfile_sourcefile_attribute(cfs, CHECK);
3755 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3756 // Check for SourceDebugExtension tag
3757 if (parsed_source_debug_ext_annotations_exist) {
3758 classfile_parse_error(
3759 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3760 return;
3761 }
3762 parsed_source_debug_ext_annotations_exist = true;
3763 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3764 } else if (tag == vmSymbols::tag_inner_classes()) {
3765 // Check for InnerClasses tag
3766 if (parsed_innerclasses_attribute) {
3767 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3768 return;
3769 } else {
3770 parsed_innerclasses_attribute = true;
3771 }
3772 inner_classes_attribute_start = cfs->current();
3773 inner_classes_attribute_length = attribute_length;
3774 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3775 } else if (tag == vmSymbols::tag_synthetic()) {
3776 // Check for Synthetic tag
3777 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3778 if (attribute_length != 0) {
3779 classfile_parse_error(
3780 "Invalid Synthetic classfile attribute length %u in class file %s",
3781 attribute_length, THREAD);
3782 return;
3783 }
3784 parse_classfile_synthetic_attribute();
3785 } else if (tag == vmSymbols::tag_deprecated()) {
3786 // Check for Deprecated tag - 4276120
3787 if (attribute_length != 0) {
3788 classfile_parse_error(
3789 "Invalid Deprecated classfile attribute length %u in class file %s",
3790 attribute_length, THREAD);
3791 return;
3792 }
3793 } else if (_major_version >= JAVA_1_5_VERSION) {
3794 if (tag == vmSymbols::tag_signature()) {
3795 if (_generic_signature_index != 0) {
3796 classfile_parse_error(
3797 "Multiple Signature attributes in class file %s", THREAD);
3798 return;
3799 }
3800 if (attribute_length != 2) {
3801 classfile_parse_error(
3802 "Wrong Signature attribute length %u in class file %s",
3803 attribute_length, THREAD);
3804 return;
3805 }
3806 parse_classfile_signature_attribute(cfs, CHECK);
3807 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3808 if (runtime_visible_annotations != nullptr) {
3809 classfile_parse_error(
3810 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3811 return;
3812 }
3813 runtime_visible_annotations_length = attribute_length;
3814 runtime_visible_annotations = cfs->current();
3815 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3816 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3817 parse_annotations(cp,
3818 runtime_visible_annotations,
3819 runtime_visible_annotations_length,
3820 parsed_annotations,
3821 _loader_data,
3822 _can_access_vm_annotations);
3823 cfs->skip_u1_fast(runtime_visible_annotations_length);
3824 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3825 if (runtime_invisible_annotations_exists) {
3826 classfile_parse_error(
3827 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3828 return;
3829 }
3830 runtime_invisible_annotations_exists = true;
3831 if (PreserveAllAnnotations) {
3832 runtime_invisible_annotations_length = attribute_length;
3833 runtime_invisible_annotations = cfs->current();
3834 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
3835 }
3836 cfs->skip_u1(attribute_length, CHECK);
3837 } else if (tag == vmSymbols::tag_enclosing_method()) {
3838 if (parsed_enclosingmethod_attribute) {
3839 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3840 return;
3841 } else {
3842 parsed_enclosingmethod_attribute = true;
3843 }
3844 guarantee_property(attribute_length == 4,
3845 "Wrong EnclosingMethod attribute length %u in class file %s",
3846 attribute_length, CHECK);
3847 cfs->guarantee_more(4, CHECK); // class_index, method_index
3848 enclosing_method_class_index = cfs->get_u2_fast();
3849 enclosing_method_method_index = cfs->get_u2_fast();
3850 if (enclosing_method_class_index == 0) {
3851 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3852 return;
3853 }
3854 // Validate the constant pool indices and types
3855 check_property(valid_klass_reference_at(enclosing_method_class_index),
3856 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3857 if (enclosing_method_method_index != 0 &&
3858 (!cp->is_within_bounds(enclosing_method_method_index) ||
3859 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3860 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3861 return;
3862 }
3863 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3864 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3865 if (parsed_bootstrap_methods_attribute) {
3866 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3867 return;
3868 }
3869 parsed_bootstrap_methods_attribute = true;
3870 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3871 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3872 if (runtime_visible_type_annotations != nullptr) {
3873 classfile_parse_error(
3874 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3875 return;
3876 }
3877 runtime_visible_type_annotations_length = attribute_length;
3878 runtime_visible_type_annotations = cfs->current();
3879 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3880 // No need for the VM to parse Type annotations
3881 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3882 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3883 if (runtime_invisible_type_annotations_exists) {
3884 classfile_parse_error(
3885 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3886 return;
3887 } else {
3888 runtime_invisible_type_annotations_exists = true;
3889 }
3890 if (PreserveAllAnnotations) {
3891 runtime_invisible_type_annotations_length = attribute_length;
3892 runtime_invisible_type_annotations = cfs->current();
3893 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
3894 }
3895 cfs->skip_u1(attribute_length, CHECK);
3896 } else if (_major_version >= JAVA_11_VERSION) {
3897 if (tag == vmSymbols::tag_nest_members()) {
3898 // Check for NestMembers tag
3899 if (parsed_nest_members_attribute) {
3900 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3901 return;
3902 } else {
3903 parsed_nest_members_attribute = true;
3904 }
3905 if (parsed_nest_host_attribute) {
3906 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3907 return;
3908 }
3909 nest_members_attribute_start = cfs->current();
3910 nest_members_attribute_length = attribute_length;
3911 cfs->skip_u1(nest_members_attribute_length, CHECK);
3912 } else if (tag == vmSymbols::tag_nest_host()) {
3913 if (parsed_nest_host_attribute) {
3914 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3915 return;
3916 } else {
3917 parsed_nest_host_attribute = true;
3918 }
3919 if (parsed_nest_members_attribute) {
3920 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3921 return;
3922 }
3923 if (_need_verify) {
3924 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3925 }
3926 cfs->guarantee_more(2, CHECK);
3927 u2 class_info_index = cfs->get_u2_fast();
3928 check_property(
3929 valid_klass_reference_at(class_info_index),
3930 "Nest-host class_info_index %u has bad constant type in class file %s",
3931 class_info_index, CHECK);
3932 _nest_host = class_info_index;
3933
3934 } else if (_major_version >= JAVA_16_VERSION) {
3935 if (tag == vmSymbols::tag_record()) {
3936 if (parsed_record_attribute) {
3937 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3938 return;
3939 }
3940 parsed_record_attribute = true;
3941 record_attribute_start = cfs->current();
3942 record_attribute_length = attribute_length;
3943 } else if (_major_version >= JAVA_17_VERSION) {
3944 if (tag == vmSymbols::tag_permitted_subclasses()) {
3945 if (parsed_permitted_subclasses_attribute) {
3946 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3947 return;
3948 }
3949 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3950 if (_access_flags.is_final()) {
3951 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3952 return;
3953 }
3954 parsed_permitted_subclasses_attribute = true;
3955 permitted_subclasses_attribute_start = cfs->current();
3956 permitted_subclasses_attribute_length = attribute_length;
3957 }
3958 if (EnableValhalla && tag == vmSymbols::tag_preload()) {
3959 if (parsed_preload_attribute) {
3960 classfile_parse_error("Multiple Preload attributes in class file %s", CHECK);
3961 return;
3962 }
3963 parsed_preload_attribute = true;
3964 preload_attribute_start = cfs->current();
3965 preload_attribute_length = attribute_length;
3966 }
3967 }
3968 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3969 cfs->skip_u1(attribute_length, CHECK);
3970 } else {
3971 // Unknown attribute
3972 cfs->skip_u1(attribute_length, CHECK);
3973 }
3974 } else {
3975 // Unknown attribute
3976 cfs->skip_u1(attribute_length, CHECK);
3977 }
3978 } else {
3979 // Unknown attribute
3980 cfs->skip_u1(attribute_length, CHECK);
3981 }
3982 }
3983 _class_annotations = assemble_annotations(runtime_visible_annotations,
3984 runtime_visible_annotations_length,
3985 runtime_invisible_annotations,
3986 runtime_invisible_annotations_length,
3987 CHECK);
3988 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3989 runtime_visible_type_annotations_length,
3990 runtime_invisible_type_annotations,
3991 runtime_invisible_type_annotations_length,
3992 CHECK);
3993
3994 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3995 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3996 cfs,
3997 cp,
3998 inner_classes_attribute_start,
3999 parsed_innerclasses_attribute,
4000 enclosing_method_class_index,
4001 enclosing_method_method_index,
4002 CHECK);
4003 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
4004 guarantee_property(
4005 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
4006 "Wrong InnerClasses attribute length in class file %s", CHECK);
4007 }
4008 }
4009
4010 if (parsed_nest_members_attribute) {
4011 const u2 num_of_classes = parse_classfile_nest_members_attribute(
4012 cfs,
4013 nest_members_attribute_start,
4014 CHECK);
4015 if (_need_verify) {
4016 guarantee_property(
4017 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
4018 "Wrong NestMembers attribute length in class file %s", CHECK);
4019 }
4020 }
4021
4022 if (parsed_record_attribute) {
4023 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
4024 cfs,
4025 cp,
4026 record_attribute_start,
4027 CHECK);
4028 if (_need_verify) {
4029 guarantee_property(record_attribute_length == calculated_attr_length,
4030 "Record attribute has wrong length in class file %s",
4031 CHECK);
4032 }
4033 }
4034
4035 if (parsed_permitted_subclasses_attribute) {
4036 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
4037 cfs,
4038 permitted_subclasses_attribute_start,
4039 CHECK);
4040 if (_need_verify) {
4041 guarantee_property(
4042 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
4043 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
4044 }
4045 }
4046
4047 if (parsed_preload_attribute) {
4048 const u2 num_classes = parse_classfile_preload_attribute(
4049 cfs,
4050 preload_attribute_start,
4051 CHECK);
4052 if (_need_verify) {
4053 guarantee_property(
4054 preload_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
4055 "Wrong Preload attribute length in class file %s", CHECK);
4056 }
4057 }
4058
4059 if (_max_bootstrap_specifier_index >= 0) {
4060 guarantee_property(parsed_bootstrap_methods_attribute,
4061 "Missing BootstrapMethods attribute in class file %s", CHECK);
4062 }
4063 }
4064
4065 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
4066 assert(k != nullptr, "invariant");
4067
4068 if (_synthetic_flag)
4069 k->set_is_synthetic();
4070 if (_sourcefile_index != 0) {
4071 k->set_source_file_name_index(_sourcefile_index);
4072 }
4073 if (_generic_signature_index != 0) {
4074 k->set_generic_signature_index(_generic_signature_index);
4075 }
4076 if (_sde_buffer != nullptr) {
4077 k->set_source_debug_extension(_sde_buffer, _sde_length);
4078 }
4079 }
4080
4081 // Create the Annotations object that will
4082 // hold the annotations array for the Klass.
4083 void ClassFileParser::create_combined_annotations(TRAPS) {
4084 if (_class_annotations == nullptr &&
4085 _class_type_annotations == nullptr &&
4086 _fields_annotations == nullptr &&
4087 _fields_type_annotations == nullptr) {
4088 // Don't create the Annotations object unnecessarily.
4089 return;
4090 }
4091
4092 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
4093 annotations->set_class_annotations(_class_annotations);
4094 annotations->set_class_type_annotations(_class_type_annotations);
4095 annotations->set_fields_annotations(_fields_annotations);
4096 annotations->set_fields_type_annotations(_fields_type_annotations);
4097
4098 // This is the Annotations object that will be
4099 // assigned to InstanceKlass being constructed.
4100 _combined_annotations = annotations;
4101
4102 // The annotations arrays below has been transferred the
4103 // _combined_annotations so these fields can now be cleared.
4104 _class_annotations = nullptr;
4105 _class_type_annotations = nullptr;
4106 _fields_annotations = nullptr;
4107 _fields_type_annotations = nullptr;
4108 }
4109
4110 // Transfer ownership of metadata allocated to the InstanceKlass.
4111 void ClassFileParser::apply_parsed_class_metadata(
4112 InstanceKlass* this_klass,
4113 int java_fields_count) {
4114 assert(this_klass != nullptr, "invariant");
4115
4116 _cp->set_pool_holder(this_klass);
4117 this_klass->set_constants(_cp);
4118 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
4119 this_klass->set_fields_status(_fields_status);
4120 this_klass->set_methods(_methods);
4121 this_klass->set_inner_classes(_inner_classes);
4122 this_klass->set_nest_members(_nest_members);
4123 this_klass->set_nest_host_index(_nest_host);
4124 this_klass->set_preload_classes(_preload_classes);
4125 this_klass->set_annotations(_combined_annotations);
4126 this_klass->set_permitted_subclasses(_permitted_subclasses);
4127 this_klass->set_record_components(_record_components);
4128 // Delay the setting of _local_interfaces and _transitive_interfaces until after
4129 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
4130 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
4131 // its _super. If an OOM occurs while loading the current klass, its _super field
4132 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
4133 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
4134 // dereferences to the deallocated _transitive_interfaces will result in a crash.
4135
4136 // Clear out these fields so they don't get deallocated by the destructor
4137 clear_class_metadata();
4138 }
4139
4140 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
4141 int runtime_visible_annotations_length,
4142 const u1* const runtime_invisible_annotations,
4143 int runtime_invisible_annotations_length,
4144 TRAPS) {
4145 AnnotationArray* annotations = nullptr;
4146 if (runtime_visible_annotations != nullptr ||
4147 runtime_invisible_annotations != nullptr) {
4148 annotations = MetadataFactory::new_array<u1>(_loader_data,
4149 runtime_visible_annotations_length +
4150 runtime_invisible_annotations_length,
4151 CHECK_(annotations));
4152 if (runtime_visible_annotations != nullptr) {
4153 for (int i = 0; i < runtime_visible_annotations_length; i++) {
4154 annotations->at_put(i, runtime_visible_annotations[i]);
4155 }
4156 }
4157 if (runtime_invisible_annotations != nullptr) {
4158 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4159 int append = runtime_visible_annotations_length+i;
4160 annotations->at_put(append, runtime_invisible_annotations[i]);
4161 }
4162 }
4163 }
4164 return annotations;
4165 }
4166
4167 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4168 const int super_class_index,
4169 const bool need_verify,
4170 TRAPS) {
4171 assert(cp != nullptr, "invariant");
4172 const InstanceKlass* super_klass = nullptr;
4173
4174 if (super_class_index == 0) {
4175 check_property(_class_name == vmSymbols::java_lang_Object(),
4176 "Invalid superclass index 0 in class file %s",
4177 CHECK_NULL);
4178 } else {
4179 check_property(valid_klass_reference_at(super_class_index),
4180 "Invalid superclass index %u in class file %s",
4181 super_class_index,
4182 CHECK_NULL);
4183 // The class name should be legal because it is checked when parsing constant pool.
4184 // However, make sure it is not an array type.
4185 if (cp->tag_at(super_class_index).is_klass()) {
4186 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4187 }
4188 if (need_verify) {
4189 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4190 guarantee_property(!is_array,
4191 "Bad superclass name in class file %s", CHECK_NULL);
4192 }
4193 }
4194 return super_klass;
4195 }
4196
4197 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4198 _max_nonstatic_oop_maps = max_blocks;
4199 _nonstatic_oop_map_count = 0;
4200 if (max_blocks == 0) {
4201 _nonstatic_oop_maps = nullptr;
4202 } else {
4203 _nonstatic_oop_maps =
4204 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4205 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4206 }
4207 }
4208
4209 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4210 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4211 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4212 }
4213
4214 // addition of super oop maps
4215 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4216 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4217 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4218
4219 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4220 _nonstatic_oop_map_count += nof_blocks;
4221 }
4222
4223 // collection of oops
4224 void OopMapBlocksBuilder::add(int offset, int count) {
4225 if (_nonstatic_oop_map_count == 0) {
4226 _nonstatic_oop_map_count++;
4227 }
4228 OopMapBlock* nonstatic_oop_map = last_oop_map();
4229 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4230 nonstatic_oop_map->set_offset(offset);
4231 nonstatic_oop_map->set_count(count);
4232 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4233 nonstatic_oop_map->increment_count(count);
4234 } else { // Need a new one...
4235 _nonstatic_oop_map_count++;
4236 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4237 nonstatic_oop_map = last_oop_map();
4238 nonstatic_oop_map->set_offset(offset);
4239 nonstatic_oop_map->set_count(count);
4240 }
4241 }
4242
4243 // general purpose copy, e.g. into allocated instanceKlass
4244 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4245 if (_nonstatic_oop_map_count != 0) {
4246 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4247 }
4248 }
4249
4250 // Sort and compact adjacent blocks
4251 void OopMapBlocksBuilder::compact() {
4252 if (_nonstatic_oop_map_count <= 1) {
4253 return;
4254 }
4255 /*
4256 * Since field layout sneaks in oops before values, we will be able to condense
4257 * blocks. There is potential to compact between super, own refs and values
4258 * containing refs.
4259 *
4260 * Currently compaction is slightly limited due to values being 8 byte aligned.
4261 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4262 * and maybe it doesn't need to be.
4263 */
4264 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4265 (_sort_Fn)OopMapBlock::compare_offset);
4266 if (_nonstatic_oop_map_count < 2) {
4267 return;
4268 }
4269
4270 // Make a temp copy, and iterate through and copy back into the original
4271 ResourceMark rm;
4272 OopMapBlock* oop_maps_copy =
4273 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4274 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4275 copy(oop_maps_copy);
4276 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4277 unsigned int new_count = 1;
4278 oop_maps_copy++;
4279 while(oop_maps_copy < oop_maps_copy_end) {
4280 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4281 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4282 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4283 } else {
4284 nonstatic_oop_map++;
4285 new_count++;
4286 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4287 nonstatic_oop_map->set_count(oop_maps_copy->count());
4288 }
4289 oop_maps_copy++;
4290 }
4291 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4292 _nonstatic_oop_map_count = new_count;
4293 }
4294
4295 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4296 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4297 if (_nonstatic_oop_map_count > 0) {
4298 OopMapBlock* map = _nonstatic_oop_maps;
4299 OopMapBlock* last_map = last_oop_map();
4300 assert(map <= last_map, "Last less than first");
4301 while (map <= last_map) {
4302 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4303 map->offset() + map->offset_span() - heapOopSize, map->count());
4304 map++;
4305 }
4306 }
4307 }
4308
4309 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4310 print_on(st);
4311 }
4312
4313 void ClassFileParser::throwInlineTypeLimitation(THREAD_AND_LOCATION_DECL,
4314 const char* msg,
4315 const Symbol* name,
4316 const Symbol* sig) const {
4317
4318 ResourceMark rm(THREAD);
4319 if (name == nullptr || sig == nullptr) {
4320 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4321 vmSymbols::java_lang_ClassFormatError(),
4322 "class: %s - %s", _class_name->as_C_string(), msg);
4323 }
4324 else {
4325 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4326 vmSymbols::java_lang_ClassFormatError(),
4327 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4328 _class_name->as_C_string(), msg);
4329 }
4330 }
4331
4332 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4333 assert(ik != nullptr, "invariant");
4334
4335 const InstanceKlass* const super = ik->java_super();
4336
4337 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4338 // in which case we don't have to register objects as finalizable
4339 if (!_has_empty_finalizer) {
4340 if (_has_finalizer ||
4341 (super != nullptr && super->has_finalizer())) {
4342 ik->set_has_finalizer();
4343 }
4344 }
4345
4346 #ifdef ASSERT
4347 bool f = false;
4348 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4349 vmSymbols::void_method_signature());
4350 if (InstanceKlass::is_finalization_enabled() &&
4351 (m != nullptr) && !m->is_empty_method()) {
4352 f = true;
4353 }
4354
4355 // Spec doesn't prevent agent from redefinition of empty finalizer.
4356 // Despite the fact that it's generally bad idea and redefined finalizer
4357 // will not work as expected we shouldn't abort vm in this case
4358 if (!ik->has_redefined_this_or_super()) {
4359 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4360 }
4361 #endif
4362
4363 // Check if this klass supports the java.lang.Cloneable interface
4364 if (vmClasses::Cloneable_klass_loaded()) {
4365 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4366 if (ik->is_inline_klass()) {
4367 JavaThread *THREAD = JavaThread::current();
4368 throwInlineTypeLimitation(THREAD_AND_LOCATION, "Inline Types do not support Cloneable");
4369 return;
4370 }
4371 ik->set_is_cloneable();
4372 }
4373 }
4374
4375 // Check if this klass has a vanilla default constructor
4376 if (super == nullptr) {
4377 // java.lang.Object has empty default constructor
4378 ik->set_has_vanilla_constructor();
4379 } else {
4380 if (super->has_vanilla_constructor() &&
4381 _has_vanilla_constructor) {
4382 ik->set_has_vanilla_constructor();
4383 }
4384 #ifdef ASSERT
4385 bool v = false;
4386 if (super->has_vanilla_constructor()) {
4387 const Method* const constructor =
4388 ik->find_method(vmSymbols::object_initializer_name(),
4389 vmSymbols::void_method_signature());
4390 if (constructor != nullptr && constructor->is_vanilla_constructor()) {
4391 v = true;
4392 }
4393 }
4394 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4395 #endif
4396 }
4397
4398 // If it cannot be fast-path allocated, set a bit in the layout helper.
4399 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4400 assert(ik->size_helper() > 0, "layout_helper is initialized");
4401 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4402 || ik->is_abstract() || ik->is_interface()
4403 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4404 || ik->size_helper() >= FastAllocateSizeLimit) {
4405 // Forbid fast-path allocation.
4406 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4407 ik->set_layout_helper(lh);
4408 }
4409 }
4410
4411 bool ClassFileParser::supports_inline_types() const {
4412 // Inline types are only supported by class file version 61.65535 and later
4413 return _major_version > JAVA_22_VERSION ||
4414 (_major_version == JAVA_22_VERSION /*&& _minor_version == JAVA_PREVIEW_MINOR_VERSION*/); // JAVA_PREVIEW_MINOR_VERSION not yet implemented by javac, check JVMS draft
4415 }
4416
4417 // utility methods for appending an array with check for duplicates
4418
4419 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4420 const Array<InstanceKlass*>* const ifs) {
4421 // iterate over new interfaces
4422 for (int i = 0; i < ifs->length(); i++) {
4423 InstanceKlass* const e = ifs->at(i);
4424 assert(e->is_klass() && e->is_interface(), "just checking");
4425 // add new interface
4426 result->append_if_missing(e);
4427 }
4428 }
4429
4430 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4431 Array<InstanceKlass*>* local_ifs,
4432 ClassLoaderData* loader_data,
4433 TRAPS) {
4434 assert(local_ifs != nullptr, "invariant");
4435 assert(loader_data != nullptr, "invariant");
4436
4437 // Compute maximum size for transitive interfaces
4438 int max_transitive_size = 0;
4439 int super_size = 0;
4440 // Add superclass transitive interfaces size
4441 if (super != nullptr) {
4442 super_size = super->transitive_interfaces()->length();
4443 max_transitive_size += super_size;
4444 }
4445 // Add local interfaces' super interfaces
4446 const int local_size = local_ifs->length();
4447 for (int i = 0; i < local_size; i++) {
4448 InstanceKlass* const l = local_ifs->at(i);
4449 max_transitive_size += l->transitive_interfaces()->length();
4450 }
4451 // Finally add local interfaces
4452 max_transitive_size += local_size;
4453 // Construct array
4454 if (max_transitive_size == 0) {
4455 // no interfaces, use canonicalized array
4456 return Universe::the_empty_instance_klass_array();
4457 } else if (max_transitive_size == super_size) {
4458 // no new local interfaces added, share superklass' transitive interface array
4459 return super->transitive_interfaces();
4460 // The three lines below are commented to work around bug JDK-8245487
4461 // } else if (max_transitive_size == local_size) {
4462 // // only local interfaces added, share local interface array
4463 // return local_ifs;
4464 } else {
4465 ResourceMark rm;
4466 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4467
4468 // Copy down from superclass
4469 if (super != nullptr) {
4470 append_interfaces(result, super->transitive_interfaces());
4471 }
4472
4473 // Copy down from local interfaces' superinterfaces
4474 for (int i = 0; i < local_size; i++) {
4475 InstanceKlass* const l = local_ifs->at(i);
4476 append_interfaces(result, l->transitive_interfaces());
4477 }
4478 // Finally add local interfaces
4479 append_interfaces(result, local_ifs);
4480
4481 // length will be less than the max_transitive_size if duplicates were removed
4482 const int length = result->length();
4483 assert(length <= max_transitive_size, "just checking");
4484
4485 Array<InstanceKlass*>* const new_result =
4486 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4487 for (int i = 0; i < length; i++) {
4488 InstanceKlass* const e = result->at(i);
4489 assert(e != nullptr, "just checking");
4490 new_result->at_put(i, e);
4491 }
4492 return new_result;
4493 }
4494 }
4495
4496 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4497 assert(this_klass != nullptr, "invariant");
4498 const Klass* const super = this_klass->super();
4499
4500 if (super != nullptr) {
4501 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4502
4503 if (super->is_final()) {
4504 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4505 return;
4506 }
4507
4508 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4509 classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4510 return;
4511 }
4512
4513 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4514 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4515 // for a value classes. So, it is treated as a special case for now.
4516 if (this_klass->access_flags().is_value_class() &&
4517 super_ik->name() != vmSymbols::java_lang_Object() &&
4518 super_ik->is_identity_class()) {
4519 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4520 return;
4521 }
4522
4523 // If the loader is not the boot loader then throw an exception if its
4524 // superclass is in package jdk.internal.reflect and its loader is not a
4525 // special reflection class loader
4526 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4527 PackageEntry* super_package = super->package();
4528 if (super_package != nullptr &&
4529 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4530 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4531 ResourceMark rm(THREAD);
4532 Exceptions::fthrow(
4533 THREAD_AND_LOCATION,
4534 vmSymbols::java_lang_IllegalAccessError(),
4535 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4536 this_klass->external_name(),
4537 this_klass->class_loader_data()->loader_name_and_id(),
4538 super->external_name());
4539 return;
4540 }
4541 }
4542
4543 Reflection::VerifyClassAccessResults vca_result =
4544 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4545 if (vca_result != Reflection::ACCESS_OK) {
4546 ResourceMark rm(THREAD);
4547 char* msg = Reflection::verify_class_access_msg(this_klass,
4548 InstanceKlass::cast(super),
4549 vca_result);
4550 if (msg == nullptr) {
4551 bool same_module = (this_klass->module() == super->module());
4552 Exceptions::fthrow(
4553 THREAD_AND_LOCATION,
4554 vmSymbols::java_lang_IllegalAccessError(),
4555 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4556 this_klass->external_name(),
4557 super->is_abstract() ? "abstract " : "",
4558 super->external_name(),
4559 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4560 (same_module) ? "" : "; ",
4561 (same_module) ? "" : super->class_in_module_of_loader());
4562 } else {
4563 // Add additional message content.
4564 Exceptions::fthrow(
4565 THREAD_AND_LOCATION,
4566 vmSymbols::java_lang_IllegalAccessError(),
4567 "superclass access check failed: %s",
4568 msg);
4569 }
4570 }
4571 }
4572 }
4573
4574
4575 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4576 assert(this_klass != nullptr, "invariant");
4577 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4578 const int lng = local_interfaces->length();
4579 for (int i = lng - 1; i >= 0; i--) {
4580 InstanceKlass* const k = local_interfaces->at(i);
4581 assert (k != nullptr && k->is_interface(), "invalid interface");
4582
4583 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4584 classfile_icce_error(this_klass->is_interface() ?
4585 "class %s cannot extend sealed interface %s" :
4586 "class %s cannot implement sealed interface %s",
4587 k, THREAD);
4588 return;
4589 }
4590
4591 Reflection::VerifyClassAccessResults vca_result =
4592 Reflection::verify_class_access(this_klass, k, false);
4593 if (vca_result != Reflection::ACCESS_OK) {
4594 ResourceMark rm(THREAD);
4595 char* msg = Reflection::verify_class_access_msg(this_klass,
4596 k,
4597 vca_result);
4598 if (msg == nullptr) {
4599 bool same_module = (this_klass->module() == k->module());
4600 Exceptions::fthrow(
4601 THREAD_AND_LOCATION,
4602 vmSymbols::java_lang_IllegalAccessError(),
4603 "class %s cannot access its superinterface %s (%s%s%s)",
4604 this_klass->external_name(),
4605 k->external_name(),
4606 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4607 (same_module) ? "" : "; ",
4608 (same_module) ? "" : k->class_in_module_of_loader());
4609 } else {
4610 // Add additional message content.
4611 Exceptions::fthrow(
4612 THREAD_AND_LOCATION,
4613 vmSymbols::java_lang_IllegalAccessError(),
4614 "superinterface check failed: %s",
4615 msg);
4616 }
4617 }
4618 }
4619 }
4620
4621
4622 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4623 assert(this_klass != nullptr, "invariant");
4624 const Array<Method*>* const methods = this_klass->methods();
4625 const int num_methods = methods->length();
4626
4627 // go thru each method and check if it overrides a final method
4628 for (int index = 0; index < num_methods; index++) {
4629 const Method* const m = methods->at(index);
4630
4631 // skip private, static, and <init> methods
4632 if ((!m->is_private() && !m->is_static()) &&
4633 (m->name() != vmSymbols::object_initializer_name())) {
4634
4635 const Symbol* const name = m->name();
4636 const Symbol* const signature = m->signature();
4637 const InstanceKlass* k = this_klass->java_super();
4638 const Method* super_m = nullptr;
4639 while (k != nullptr) {
4640 // skip supers that don't have final methods.
4641 if (k->has_final_method()) {
4642 // lookup a matching method in the super class hierarchy
4643 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4644 if (super_m == nullptr) {
4645 break; // didn't find any match; get out
4646 }
4647
4648 if (super_m->is_final() && !super_m->is_static() &&
4649 !super_m->access_flags().is_private()) {
4650 // matching method in super is final, and not static or private
4651 bool can_access = Reflection::verify_member_access(this_klass,
4652 super_m->method_holder(),
4653 super_m->method_holder(),
4654 super_m->access_flags(),
4655 false, false, CHECK);
4656 if (can_access) {
4657 // this class can access super final method and therefore override
4658 ResourceMark rm(THREAD);
4659 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4660 err_msg("class %s overrides final method %s.%s%s",
4661 this_klass->external_name(),
4662 super_m->method_holder()->external_name(),
4663 name->as_C_string(),
4664 signature->as_C_string()));
4665 }
4666 }
4667
4668 // continue to look from super_m's holder's super.
4669 k = super_m->method_holder()->java_super();
4670 continue;
4671 }
4672
4673 k = k->java_super();
4674 }
4675 }
4676 }
4677 }
4678
4679
4680 // assumes that this_klass is an interface
4681 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4682 assert(this_klass != nullptr, "invariant");
4683 assert(this_klass->is_interface(), "not an interface");
4684 const Array<Method*>* methods = this_klass->methods();
4685 const int num_methods = methods->length();
4686
4687 for (int index = 0; index < num_methods; index++) {
4688 const Method* const m = methods->at(index);
4689 // if m is static and not the init method, throw a verify error
4690 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4691 ResourceMark rm(THREAD);
4692 Exceptions::fthrow(
4693 THREAD_AND_LOCATION,
4694 vmSymbols::java_lang_VerifyError(),
4695 "Illegal static method %s in interface %s",
4696 m->name()->as_C_string(),
4697 this_klass->external_name()
4698 );
4699 return;
4700 }
4701 }
4702 }
4703
4704 // utility methods for format checking
4705
4706 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4707 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4708 const bool is_value_class = (flags & JVM_ACC_VALUE) != 0;
4709 const bool is_primitive_class = (flags & JVM_ACC_PRIMITIVE) != 0;
4710 const bool is_identity_class = (flags & JVM_ACC_IDENTITY) != 0;
4711 const bool is_inner_class = name != nullptr;
4712 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4713 if (is_module) {
4714 ResourceMark rm(THREAD);
4715 Exceptions::fthrow(
4716 THREAD_AND_LOCATION,
4717 vmSymbols::java_lang_NoClassDefFoundError(),
4718 "%s is not a class because access_flag ACC_MODULE is set",
4719 _class_name->as_C_string());
4720 return;
4721 }
4722
4723 if (is_value_class && !EnableValhalla) {
4724 ResourceMark rm(THREAD);
4725 Exceptions::fthrow(
4726 THREAD_AND_LOCATION,
4727 vmSymbols::java_lang_ClassFormatError(),
4728 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4729 _class_name->as_C_string()
4730 );
4731 return;
4732 }
4733
4734 if (is_primitive_class && !EnablePrimitiveClasses) {
4735 ResourceMark rm(THREAD);
4736 Exceptions::fthrow(
4737 THREAD_AND_LOCATION,
4738 vmSymbols::java_lang_ClassFormatError(),
4739 "Class modifier ACC_PRIMITIVE in class %s requires option -XX:+EnablePrimitiveClasses",
4740 _class_name->as_C_string()
4741 );
4742 return;
4743 }
4744
4745 // if (!_need_verify) { return; }
4746
4747 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4748 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4749 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4750 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4751 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4752 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4753 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4754
4755 if ((is_abstract && is_final) ||
4756 (is_interface && !is_abstract) ||
4757 (is_interface && major_gte_1_5 && ((is_super && (!EnableValhalla || !supports_inline_types())) || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4758 (!is_interface && major_gte_1_5 && is_annotation) ||
4759 (is_value_class && is_enum) ||
4760 (is_identity_class && is_value_class) ||
4761 (EnableValhalla && supports_inline_types() && !is_module && !is_abstract && !is_Object && !(is_identity_class || is_value_class) && !is_inner_class) ||
4762 (EnablePrimitiveClasses && supports_inline_types() && is_primitive_class && (!is_value_class || !is_final || is_interface || is_abstract))) {
4763 ResourceMark rm(THREAD);
4764 const char* class_note = "";
4765 if (is_value_class) class_note = " (a value class)";
4766 if (is_primitive_class) class_note = " (a primitive class)";
4767 if (is_value_class && is_identity_class) class_note = " (a value and identity class)";
4768 if (name == nullptr) { // Not an inner class
4769 Exceptions::fthrow(
4770 THREAD_AND_LOCATION,
4771 vmSymbols::java_lang_ClassFormatError(),
4772 "Illegal class modifiers in class %s%s: 0x%X",
4773 _class_name->as_C_string(), class_note, flags
4774 );
4775 return;
4776 } else {
4777 Exceptions::fthrow(
4778 THREAD_AND_LOCATION,
4779 vmSymbols::java_lang_ClassFormatError(),
4780 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4781 name, class_note, _class_name->as_C_string(), flags
4782 );
4783 return;
4784 }
4785 }
4786 }
4787
4788 static bool has_illegal_visibility(jint flags) {
4789 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4790 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4791 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4792
4793 return ((is_public && is_protected) ||
4794 (is_public && is_private) ||
4795 (is_protected && is_private));
4796 }
4797
4798 // A legal major_version.minor_version must be one of the following:
4799 //
4800 // Major_version >= 45 and major_version < 56, any minor_version.
4801 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4802 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4803 //
4804 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4805 ResourceMark rm(THREAD);
4806 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4807 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4808 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4809 class_name, major, minor, THREAD);
4810 return;
4811 }
4812
4813 if (major > max_version) {
4814 Exceptions::fthrow(
4815 THREAD_AND_LOCATION,
4816 vmSymbols::java_lang_UnsupportedClassVersionError(),
4817 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4818 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4819 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4820 return;
4821 }
4822
4823 if (major < JAVA_12_VERSION || minor == 0) {
4824 return;
4825 }
4826
4827 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4828 if (major != max_version) {
4829 Exceptions::fthrow(
4830 THREAD_AND_LOCATION,
4831 vmSymbols::java_lang_UnsupportedClassVersionError(),
4832 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4833 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4834 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4835 return;
4836 }
4837
4838 if (!Arguments::enable_preview()) {
4839 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4840 class_name, major, minor, THREAD);
4841 return;
4842 }
4843
4844 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4845 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4846 class_name, major, minor, THREAD);
4847 }
4848 }
4849
4850 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4851 AccessFlags class_access_flags,
4852 TRAPS) const {
4853 if (!_need_verify) { return; }
4854
4855 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4856 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4857 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4858 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4859 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4860 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4861 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4862 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4863 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4864
4865 const bool is_interface = class_access_flags.is_interface();
4866 const bool is_abstract = class_access_flags.is_abstract();
4867 const bool is_value_class = class_access_flags.is_value_class();
4868 const bool is_identity_class = class_access_flags.is_identity_class();
4869
4870 bool is_illegal = false;
4871
4872 if (is_interface) {
4873 if (!is_public || !is_static || !is_final || is_private ||
4874 is_protected || is_volatile || is_transient ||
4875 (major_gte_1_5 && is_enum)) {
4876 is_illegal = true;
4877 }
4878 } else { // not interface
4879 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4880 is_illegal = true;
4881 } else {
4882 if (is_value_class && !is_abstract && !is_static && !is_final) {
4883 is_illegal = true;
4884 } else if (is_abstract && !is_identity_class && !is_static) {
4885 is_illegal = true;
4886 }
4887 }
4888 }
4889
4890 if (is_illegal) {
4891 ResourceMark rm(THREAD);
4892 Exceptions::fthrow(
4893 THREAD_AND_LOCATION,
4894 vmSymbols::java_lang_ClassFormatError(),
4895 "Illegal field modifiers in class %s: 0x%X",
4896 _class_name->as_C_string(), flags);
4897 return;
4898 }
4899 }
4900
4901 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4902 AccessFlags class_access_flags,
4903 const Symbol* name,
4904 TRAPS) const {
4905 if (!_need_verify) { return; }
4906
4907 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4908 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4909 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4910 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4911 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4912 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4913 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4914 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4915 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4916 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4917 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4918 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4919 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4920 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4921 const bool is_factory = (name == vmSymbols::inline_factory_name() && supports_inline_types());
4922 const bool is_interface = class_access_flags.is_interface();
4923 const bool is_value_class = class_access_flags.is_value_class();
4924 const bool is_identity_class = class_access_flags.is_identity_class();
4925 const bool is_abstract_class = class_access_flags.is_abstract();
4926
4927 bool is_illegal = false;
4928
4929 const char* class_note = "";
4930 if (is_interface) {
4931 if (major_gte_8) {
4932 // Class file version is JAVA_8_VERSION or later Methods of
4933 // interfaces may set any of the flags except ACC_PROTECTED,
4934 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4935 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4936 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4937 (is_native || is_protected || is_final || is_synchronized) ||
4938 // If a specific method of a class or interface has its
4939 // ACC_ABSTRACT flag set, it must not have any of its
4940 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4941 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4942 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4943 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4944 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4945 is_illegal = true;
4946 }
4947 } else if (major_gte_1_5) {
4948 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4949 if (!is_public || is_private || is_protected || is_static || is_final ||
4950 is_synchronized || is_native || !is_abstract || is_strict) {
4951 is_illegal = true;
4952 }
4953 } else {
4954 // Class file version is pre-JAVA_1_5_VERSION
4955 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4956 is_illegal = true;
4957 }
4958 }
4959 } else { // not interface
4960 if (has_illegal_visibility(flags)) {
4961 is_illegal = true;
4962 } else {
4963 if (is_factory) { // <vnew> factory method
4964 if (is_final || is_synchronized || is_native || !is_static ||
4965 is_abstract || is_bridge) {
4966 is_illegal = true;
4967 class_note = (is_value_class ? " (a value class)" : " (not a value class)");
4968 }
4969 } else if (is_initializer) {
4970 if (is_static || is_final || is_synchronized || is_native ||
4971 is_abstract || (major_gte_1_5 && is_bridge)) {
4972 is_illegal = true;
4973 }
4974 } else { // not initializer
4975 if (!is_identity_class && is_synchronized && !is_static) {
4976 is_illegal = true;
4977 class_note = " (not an identity class)";
4978 } else {
4979 if (is_abstract) {
4980 if ((is_final || is_native || is_private || is_static ||
4981 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4982 is_illegal = true;
4983 }
4984 }
4985 }
4986 }
4987 }
4988 }
4989
4990 if (is_illegal) {
4991 ResourceMark rm(THREAD);
4992 if (is_value_class && is_initializer) {
4993 Exceptions::fthrow(
4994 THREAD_AND_LOCATION,
4995 vmSymbols::java_lang_ClassFormatError(),
4996 "Method <init> is not allowed in value class %s",
4997 _class_name->as_C_string());
4998 } else {
4999 Exceptions::fthrow(
5000 THREAD_AND_LOCATION,
5001 vmSymbols::java_lang_ClassFormatError(),
5002 "Method %s in class %s%s has illegal modifiers: 0x%X",
5003 name->as_C_string(), _class_name->as_C_string(),
5004 class_note, flags);
5005 }
5006 return;
5007 }
5008 }
5009
5010 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5011 int length,
5012 TRAPS) const {
5013 assert(_need_verify, "only called when _need_verify is true");
5014 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5015 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
5016 }
5017 }
5018
5019 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5020 // In class names, '/' separates unqualified names. This is verified in this function also.
5021 // Method names also may not contain the characters '<' or '>', unless <init>
5022 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5023 // method. Because these names have been checked as special cases before
5024 // calling this method in verify_legal_method_name.
5025 //
5026 // This method is also called from the modular system APIs in modules.cpp
5027 // to verify the validity of module and package names.
5028 bool ClassFileParser::verify_unqualified_name(const char* name,
5029 unsigned int length,
5030 int type) {
5031 if (length == 0) return false; // Must have at least one char.
5032 for (const char* p = name; p != name + length; p++) {
5033 switch(*p) {
5034 case JVM_SIGNATURE_DOT:
5035 case JVM_SIGNATURE_ENDCLASS:
5036 case JVM_SIGNATURE_ARRAY:
5037 // do not permit '.', ';', or '['
5038 return false;
5039 case JVM_SIGNATURE_SLASH:
5040 // check for '//' or leading or trailing '/' which are not legal
5041 // unqualified name must not be empty
5042 if (type == ClassFileParser::LegalClass) {
5043 if (p == name || p+1 >= name+length ||
5044 *(p+1) == JVM_SIGNATURE_SLASH) {
5045 return false;
5046 }
5047 } else {
5048 return false; // do not permit '/' unless it's class name
5049 }
5050 break;
5051 case JVM_SIGNATURE_SPECIAL:
5052 case JVM_SIGNATURE_ENDSPECIAL:
5053 // do not permit '<' or '>' in method names
5054 if (type == ClassFileParser::LegalMethod) {
5055 return false;
5056 }
5057 }
5058 }
5059 return true;
5060 }
5061
5062 // Take pointer to a UTF8 byte string (not NUL-terminated).
5063 // Skip over the longest part of the string that could
5064 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
5065 // Return a pointer to just past the fieldname.
5066 // Return null if no fieldname at all was found, or in the case of slash_ok
5067 // being true, we saw consecutive slashes (meaning we were looking for a
5068 // qualified path but found something that was badly-formed).
5069 static const char* skip_over_field_name(const char* const name,
5070 bool slash_ok,
5071 unsigned int length) {
5072 const char* p;
5073 jboolean last_is_slash = false;
5074 jboolean not_first_ch = false;
5075
5076 for (p = name; p != name + length; not_first_ch = true) {
5077 const char* old_p = p;
5078 jchar ch = *p;
5079 if (ch < 128) {
5080 p++;
5081 // quick check for ascii
5082 if ((ch >= 'a' && ch <= 'z') ||
5083 (ch >= 'A' && ch <= 'Z') ||
5084 (ch == '_' || ch == '$') ||
5085 (not_first_ch && ch >= '0' && ch <= '9')) {
5086 last_is_slash = false;
5087 continue;
5088 }
5089 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5090 if (last_is_slash) {
5091 return nullptr; // Don't permit consecutive slashes
5092 }
5093 last_is_slash = true;
5094 continue;
5095 }
5096 }
5097 else {
5098 jint unicode_ch;
5099 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5100 p = tmp_p;
5101 last_is_slash = false;
5102 // Check if ch is Java identifier start or is Java identifier part
5103 // 4672820: call java.lang.Character methods directly without generating separate tables.
5104 EXCEPTION_MARK;
5105 // return value
5106 JavaValue result(T_BOOLEAN);
5107 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5108 JavaCallArguments args;
5109 args.push_int(unicode_ch);
5110
5111 if (not_first_ch) {
5112 // public static boolean isJavaIdentifierPart(char ch);
5113 JavaCalls::call_static(&result,
5114 vmClasses::Character_klass(),
5115 vmSymbols::isJavaIdentifierPart_name(),
5116 vmSymbols::int_bool_signature(),
5117 &args,
5118 THREAD);
5119 } else {
5120 // public static boolean isJavaIdentifierStart(char ch);
5121 JavaCalls::call_static(&result,
5122 vmClasses::Character_klass(),
5123 vmSymbols::isJavaIdentifierStart_name(),
5124 vmSymbols::int_bool_signature(),
5125 &args,
5126 THREAD);
5127 }
5128 if (HAS_PENDING_EXCEPTION) {
5129 CLEAR_PENDING_EXCEPTION;
5130 return nullptr;
5131 }
5132 if(result.get_jboolean()) {
5133 continue;
5134 }
5135 }
5136 return (not_first_ch) ? old_p : nullptr;
5137 }
5138 return (not_first_ch && !last_is_slash) ? p : nullptr;
5139 }
5140
5141 // Take pointer to a UTF8 byte string (not NUL-terminated).
5142 // Skip over the longest part of the string that could
5143 // be taken as a field signature. Allow "void" if void_ok.
5144 // Return a pointer to just past the signature.
5145 // Return null if no legal signature is found.
5146 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5147 bool void_ok,
5148 unsigned int length,
5149 TRAPS) const {
5150 unsigned int array_dim = 0;
5151 while (length > 0) {
5152 switch (signature[0]) {
5153 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
5154 case JVM_SIGNATURE_BOOLEAN:
5155 case JVM_SIGNATURE_BYTE:
5156 case JVM_SIGNATURE_CHAR:
5157 case JVM_SIGNATURE_SHORT:
5158 case JVM_SIGNATURE_INT:
5159 case JVM_SIGNATURE_FLOAT:
5160 case JVM_SIGNATURE_LONG:
5161 case JVM_SIGNATURE_DOUBLE:
5162 return signature + 1;
5163 case JVM_SIGNATURE_PRIMITIVE_OBJECT:
5164 // Can't enable this check fully until JDK upgrades the bytecode generators (TODO: JDK-8270852).
5165 // For now, compare to class file version 51 so old verifier doesn't see Q signatures.
5166 if ( (_major_version < 51 /* CONSTANT_CLASS_DESCRIPTORS */ ) || (!EnablePrimitiveClasses)) {
5167 classfile_parse_error("Class name contains illegal Q-signature "
5168 "in descriptor in class file %s, requires option -XX:+EnablePrimitiveClasses",
5169 CHECK_0);
5170 return nullptr;
5171 }
5172 // fall through
5173 case JVM_SIGNATURE_CLASS:
5174 {
5175 if (_major_version < JAVA_1_5_VERSION) {
5176 // Skip over the class name if one is there
5177 const char* const p = skip_over_field_name(signature + 1, true, --length);
5178
5179 // The next character better be a semicolon
5180 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5181 return p + 1;
5182 }
5183 }
5184 else {
5185 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5186 signature++;
5187 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5188 // Format check signature
5189 if (c != nullptr) {
5190 int newlen = c - (char*) signature;
5191 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5192 if (!legal) {
5193 classfile_parse_error("Class name is empty or contains illegal character "
5194 "in descriptor in class file %s",
5195 THREAD);
5196 return nullptr;
5197 }
5198 return signature + newlen + 1;
5199 }
5200 }
5201 return nullptr;
5202 }
5203 case JVM_SIGNATURE_ARRAY:
5204 array_dim++;
5205 if (array_dim > 255) {
5206 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5207 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
5208 return nullptr;
5209 }
5210 // The rest of what's there better be a legal signature
5211 signature++;
5212 length--;
5213 void_ok = false;
5214 break;
5215 default:
5216 return nullptr;
5217 }
5218 }
5219 return nullptr;
5220 }
5221
5222 // Checks if name is a legal class name.
5223 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5224 if (!_need_verify || _relax_verify) { return; }
5225
5226 assert(name->refcount() > 0, "symbol must be kept alive");
5227 char* bytes = (char*)name->bytes();
5228 unsigned int length = name->utf8_length();
5229 bool legal = false;
5230
5231 if (length > 0) {
5232 const char* p;
5233 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5234 p = skip_over_field_signature(bytes, false, length, CHECK);
5235 legal = (p != nullptr) && ((p - bytes) == (int)length);
5236 } else if (_major_version < JAVA_1_5_VERSION) {
5237 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5238 p = skip_over_field_name(bytes, true, length);
5239 legal = (p != nullptr) && ((p - bytes) == (int)length);
5240 }
5241 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
5242 && bytes[length - 1] == ';' ) {
5243 // Support for L...; and Q...; descriptors
5244 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5245 } else {
5246 // 4900761: relax the constraints based on JSR202 spec
5247 // Class names may be drawn from the entire Unicode character set.
5248 // Identifiers between '/' must be unqualified names.
5249 // The utf8 string has been verified when parsing cpool entries.
5250 legal = verify_unqualified_name(bytes, length, LegalClass);
5251 }
5252 }
5253 if (!legal) {
5254 ResourceMark rm(THREAD);
5255 assert(_class_name != nullptr, "invariant");
5256 Exceptions::fthrow(
5257 THREAD_AND_LOCATION,
5258 vmSymbols::java_lang_ClassFormatError(),
5259 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5260 _class_name->as_C_string()
5261 );
5262 return;
5263 }
5264 }
5265
5266 // Checks if name is a legal field name.
5267 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5268 if (!_need_verify || _relax_verify) { return; }
5269
5270 char* bytes = (char*)name->bytes();
5271 unsigned int length = name->utf8_length();
5272 bool legal = false;
5273
5274 if (length > 0) {
5275 if (_major_version < JAVA_1_5_VERSION) {
5276 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5277 const char* p = skip_over_field_name(bytes, false, length);
5278 legal = (p != nullptr) && ((p - bytes) == (int)length);
5279 }
5280 } else {
5281 // 4881221: relax the constraints based on JSR202 spec
5282 legal = verify_unqualified_name(bytes, length, LegalField);
5283 }
5284 }
5285
5286 if (!legal) {
5287 ResourceMark rm(THREAD);
5288 assert(_class_name != nullptr, "invariant");
5289 Exceptions::fthrow(
5290 THREAD_AND_LOCATION,
5291 vmSymbols::java_lang_ClassFormatError(),
5292 "Illegal field name \"%.*s\" in class %s", length, bytes,
5293 _class_name->as_C_string()
5294 );
5295 return;
5296 }
5297 }
5298
5299 // Checks if name is a legal method name.
5300 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5301 if (!_need_verify || _relax_verify) { return; }
5302
5303 assert(name != nullptr, "method name is null");
5304 char* bytes = (char*)name->bytes();
5305 unsigned int length = name->utf8_length();
5306 bool legal = false;
5307
5308 if (length > 0) {
5309 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5310 if (name == vmSymbols::object_initializer_name() ||
5311 name == vmSymbols::class_initializer_name() ||
5312 (EnableValhalla && supports_inline_types() &&
5313 name == vmSymbols::inline_factory_name())) {
5314 legal = true;
5315 }
5316 } else if (_major_version < JAVA_1_5_VERSION) {
5317 const char* p;
5318 p = skip_over_field_name(bytes, false, length);
5319 legal = (p != nullptr) && ((p - bytes) == (int)length);
5320 } else {
5321 // 4881221: relax the constraints based on JSR202 spec
5322 legal = verify_unqualified_name(bytes, length, LegalMethod);
5323 }
5324 }
5325
5326 if (!legal) {
5327 ResourceMark rm(THREAD);
5328 assert(_class_name != nullptr, "invariant");
5329 Exceptions::fthrow(
5330 THREAD_AND_LOCATION,
5331 vmSymbols::java_lang_ClassFormatError(),
5332 "Illegal method name \"%.*s\" in class %s", length, bytes,
5333 _class_name->as_C_string()
5334 );
5335 return;
5336 }
5337 }
5338
5339
5340 // Checks if signature is a legal field signature.
5341 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5342 const Symbol* signature,
5343 TRAPS) const {
5344 if (!_need_verify) { return; }
5345 if ((!supports_inline_types() || !EnablePrimitiveClasses) && (signature->is_Q_signature() || signature->is_Q_array_signature())) {
5346 throwIllegalSignature("Field", name, signature, CHECK);
5347 }
5348
5349 const char* const bytes = (const char*)signature->bytes();
5350 const unsigned int length = signature->utf8_length();
5351 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5352
5353 if (p == nullptr || (p - bytes) != (int)length) {
5354 throwIllegalSignature("Field", name, signature, CHECK);
5355 }
5356 }
5357
5358 // Check that the signature is compatible with the method name. For example,
5359 // check that <init> has a void signature.
5360 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5361 const Symbol* signature,
5362 TRAPS) const {
5363 if (!_need_verify) {
5364 return;
5365 }
5366
5367 // Class initializers cannot have args for class format version >= 51.
5368 if (name == vmSymbols::class_initializer_name() &&
5369 signature != vmSymbols::void_method_signature() &&
5370 _major_version >= JAVA_7_VERSION) {
5371 throwIllegalSignature("Method", name, signature, THREAD);
5372 return;
5373 }
5374
5375 if (!is_value_class()) {
5376 int sig_length = signature->utf8_length();
5377 if (name->utf8_length() > 0 &&
5378 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5379 sig_length > 0 &&
5380 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5381 throwIllegalSignature("Method", name, signature, THREAD);
5382 }
5383 }
5384 }
5385
5386 // Checks if signature is a legal method signature.
5387 // Returns number of parameters
5388 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5389 const Symbol* signature,
5390 TRAPS) const {
5391 if (!_need_verify) {
5392 // make sure caller's args_size will be less than 0 even for non-static
5393 // method so it will be recomputed in compute_size_of_parameters().
5394 return -2;
5395 }
5396
5397 unsigned int args_size = 0;
5398 const char* p = (const char*)signature->bytes();
5399 unsigned int length = signature->utf8_length();
5400 const char* nextp;
5401
5402 // The first character must be a '('
5403 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5404 length--;
5405 // Skip over legal field signatures
5406 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5407 while ((length > 0) && (nextp != nullptr)) {
5408 args_size++;
5409 if (p[0] == 'J' || p[0] == 'D') {
5410 args_size++;
5411 }
5412 length -= nextp - p;
5413 p = nextp;
5414 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5415 }
5416 // The first non-signature thing better be a ')'
5417 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5418 length--;
5419 // Now we better just have a return value
5420 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5421 if (nextp && ((int)length == (nextp - p))) {
5422 return args_size;
5423 }
5424 }
5425 }
5426 // Report error
5427 throwIllegalSignature("Method", name, signature, THREAD);
5428 return 0;
5429 }
5430
5431 int ClassFileParser::static_field_size() const {
5432 assert(_field_info != nullptr, "invariant");
5433 return _field_info->_static_field_size;
5434 }
5435
5436 int ClassFileParser::total_oop_map_count() const {
5437 assert(_field_info != nullptr, "invariant");
5438 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5439 }
5440
5441 jint ClassFileParser::layout_size() const {
5442 assert(_field_info != nullptr, "invariant");
5443 return _field_info->_instance_size;
5444 }
5445
5446 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5447 const Array<Method*>* methods) {
5448 assert(ik != nullptr, "invariant");
5449 assert(methods != nullptr, "invariant");
5450
5451 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5452 // (We used to do this lazily, but now we query it in Rewriter,
5453 // which is eagerly done for every method, so we might as well do it now,
5454 // when everything is fresh in memory.)
5455 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5456
5457 if (klass_id != vmSymbolID::NO_SID) {
5458 for (int j = 0; j < methods->length(); ++j) {
5459 Method* method = methods->at(j);
5460 method->init_intrinsic_id(klass_id);
5461
5462 if (CheckIntrinsics) {
5463 // Check if an intrinsic is defined for method 'method',
5464 // but the method is not annotated with @IntrinsicCandidate.
5465 if (method->intrinsic_id() != vmIntrinsics::_none &&
5466 !method->intrinsic_candidate()) {
5467 tty->print("Compiler intrinsic is defined for method [%s], "
5468 "but the method is not annotated with @IntrinsicCandidate.%s",
5469 method->name_and_sig_as_C_string(),
5470 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5471 );
5472 tty->cr();
5473 DEBUG_ONLY(vm_exit(1));
5474 }
5475 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5476 // but there is no intrinsic available for it.
5477 if (method->intrinsic_candidate() &&
5478 method->intrinsic_id() == vmIntrinsics::_none) {
5479 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5480 "but no compiler intrinsic is defined for the method.%s",
5481 method->name_and_sig_as_C_string(),
5482 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5483 );
5484 tty->cr();
5485 DEBUG_ONLY(vm_exit(1));
5486 }
5487 }
5488 } // end for
5489
5490 #ifdef ASSERT
5491 if (CheckIntrinsics) {
5492 // Check for orphan methods in the current class. A method m
5493 // of a class C is orphan if an intrinsic is defined for method m,
5494 // but class C does not declare m.
5495 // The check is potentially expensive, therefore it is available
5496 // only in debug builds.
5497
5498 for (auto id : EnumRange<vmIntrinsicID>{}) {
5499 if (vmIntrinsics::_compiledLambdaForm == id) {
5500 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5501 // generated for the JVM from a LambdaForm and therefore no method
5502 // is defined for it.
5503 continue;
5504 }
5505 if (vmIntrinsics::_blackhole == id) {
5506 // The _blackhole intrinsic is a special marker. No explicit method
5507 // is defined for it.
5508 continue;
5509 }
5510
5511 if (vmIntrinsics::class_for(id) == klass_id) {
5512 // Check if the current class contains a method with the same
5513 // name, flags, signature.
5514 bool match = false;
5515 for (int j = 0; j < methods->length(); ++j) {
5516 const Method* method = methods->at(j);
5517 if (method->intrinsic_id() == id) {
5518 match = true;
5519 break;
5520 }
5521 }
5522
5523 if (!match) {
5524 char buf[1000];
5525 tty->print("Compiler intrinsic is defined for method [%s], "
5526 "but the method is not available in class [%s].%s",
5527 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5528 ik->name()->as_C_string(),
5529 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5530 );
5531 tty->cr();
5532 DEBUG_ONLY(vm_exit(1));
5533 }
5534 }
5535 } // end for
5536 } // CheckIntrinsics
5537 #endif // ASSERT
5538 }
5539 }
5540
5541 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5542 const ClassInstanceInfo& cl_inst_info,
5543 TRAPS) {
5544 if (_klass != nullptr) {
5545 return _klass;
5546 }
5547
5548 InstanceKlass* const ik =
5549 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5550
5551 if (is_hidden()) {
5552 mangle_hidden_class_name(ik);
5553 }
5554
5555 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5556
5557 assert(_klass == ik, "invariant");
5558 return ik;
5559 }
5560
5561 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5562 bool changed_by_loadhook,
5563 const ClassInstanceInfo& cl_inst_info,
5564 TRAPS) {
5565 assert(ik != nullptr, "invariant");
5566
5567 // Set name and CLD before adding to CLD
5568 ik->set_class_loader_data(_loader_data);
5569 ik->set_name(_class_name);
5570
5571 // Add all classes to our internal class loader list here,
5572 // including classes in the bootstrap (null) class loader.
5573 const bool publicize = !is_internal();
5574
5575 _loader_data->add_class(ik, publicize);
5576
5577 set_klass_to_deallocate(ik);
5578
5579 assert(_field_info != nullptr, "invariant");
5580 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5581 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5582 "sanity");
5583
5584 assert(ik->is_instance_klass(), "sanity");
5585 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5586
5587 // Fill in information already parsed
5588 ik->set_should_verify_class(_need_verify);
5589
5590 // Not yet: supers are done below to support the new subtype-checking fields
5591 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5592 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5593 if (_field_info->_is_naturally_atomic && ik->is_inline_klass()) {
5594 ik->set_is_naturally_atomic();
5595 }
5596
5597 if (carries_identity_modifier()) {
5598 ik->set_carries_identity_modifier();
5599 } else if (carries_value_modifier()) {
5600 ik->set_carries_value_modifier();
5601 }
5602
5603 assert(_fac != nullptr, "invariant");
5604 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_INLINE]);
5605
5606 // this transfers ownership of a lot of arrays from
5607 // the parser onto the InstanceKlass*
5608 apply_parsed_class_metadata(ik, _java_fields_count);
5609 if (ik->is_inline_klass()) {
5610 InlineKlass::cast(ik)->init_fixed_block();
5611 }
5612
5613 // can only set dynamic nest-host after static nest information is set
5614 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5615 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5616 }
5617
5618 // note that is not safe to use the fields in the parser from this point on
5619 assert(nullptr == _cp, "invariant");
5620 assert(nullptr == _fieldinfo_stream, "invariant");
5621 assert(nullptr == _fields_status, "invariant");
5622 assert(nullptr == _methods, "invariant");
5623 assert(nullptr == _inner_classes, "invariant");
5624 assert(nullptr == _nest_members, "invariant");
5625 assert(nullptr == _preload_classes, "invariant");
5626 assert(nullptr == _combined_annotations, "invariant");
5627 assert(nullptr == _record_components, "invariant");
5628 assert(nullptr == _permitted_subclasses, "invariant");
5629
5630 if (_has_localvariable_table) {
5631 ik->set_has_localvariable_table(true);
5632 }
5633
5634 if (_has_final_method) {
5635 ik->set_has_final_method();
5636 }
5637
5638 ik->copy_method_ordering(_method_ordering, CHECK);
5639 // The InstanceKlass::_methods_jmethod_ids cache
5640 // is managed on the assumption that the initial cache
5641 // size is equal to the number of methods in the class. If
5642 // that changes, then InstanceKlass::idnum_can_increment()
5643 // has to be changed accordingly.
5644 ik->set_initial_method_idnum(ik->methods()->length());
5645
5646 ik->set_this_class_index(_this_class_index);
5647
5648 if (_is_hidden) {
5649 // _this_class_index is a CONSTANT_Class entry that refers to this
5650 // hidden class itself. If this class needs to refer to its own methods
5651 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5652 // _this_class_index. However, because this class is hidden (it's
5653 // not stored in SystemDictionary), _this_class_index cannot be resolved
5654 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5655 // Therefore, we must eagerly resolve _this_class_index now.
5656 ik->constants()->klass_at_put(_this_class_index, ik);
5657 }
5658
5659 ik->set_minor_version(_minor_version);
5660 ik->set_major_version(_major_version);
5661 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5662 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5663 if (_is_declared_atomic) {
5664 ik->set_is_declared_atomic();
5665 }
5666
5667 if (_is_hidden) {
5668 ik->set_is_hidden();
5669 }
5670
5671 // Set PackageEntry for this_klass
5672 oop cl = ik->class_loader();
5673 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5674 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5675 ik->set_package(cld, nullptr, CHECK);
5676
5677 const Array<Method*>* const methods = ik->methods();
5678 assert(methods != nullptr, "invariant");
5679 const int methods_len = methods->length();
5680
5681 check_methods_for_intrinsics(ik, methods);
5682
5683 // Fill in field values obtained by parse_classfile_attributes
5684 if (_parsed_annotations->has_any_annotations()) {
5685 _parsed_annotations->apply_to(ik);
5686 }
5687
5688 apply_parsed_class_attributes(ik);
5689
5690 // Miranda methods
5691 if ((_num_miranda_methods > 0) ||
5692 // if this class introduced new miranda methods or
5693 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5694 // super class exists and this class inherited miranda methods
5695 ) {
5696 ik->set_has_miranda_methods(); // then set a flag
5697 }
5698
5699 // Fill in information needed to compute superclasses.
5700 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5701 ik->set_transitive_interfaces(_transitive_interfaces);
5702 ik->set_local_interfaces(_local_interfaces);
5703 _transitive_interfaces = nullptr;
5704 _local_interfaces = nullptr;
5705
5706 // Initialize itable offset tables
5707 klassItable::setup_itable_offset_table(ik);
5708
5709 // Compute transitive closure of interfaces this class implements
5710 // Do final class setup
5711 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5712 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5713 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5714 }
5715
5716 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5717 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5718 ik->set_has_contended_annotations(true);
5719 }
5720
5721 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5722 set_precomputed_flags(ik);
5723
5724 // check if this class can access its super class
5725 check_super_class_access(ik, CHECK);
5726
5727 // check if this class can access its superinterfaces
5728 check_super_interface_access(ik, CHECK);
5729
5730 // check if this class overrides any final method
5731 check_final_method_override(ik, CHECK);
5732
5733 // reject static interface methods prior to Java 8
5734 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5735 check_illegal_static_method(ik, CHECK);
5736 }
5737
5738 // Obtain this_klass' module entry
5739 ModuleEntry* module_entry = ik->module();
5740 assert(module_entry != nullptr, "module_entry should always be set");
5741
5742 // Obtain java.lang.Module
5743 Handle module_handle(THREAD, module_entry->module());
5744
5745 // Allocate mirror and initialize static fields
5746 // The create_mirror() call will also call compute_modifiers()
5747 java_lang_Class::create_mirror(ik,
5748 Handle(THREAD, _loader_data->class_loader()),
5749 module_handle,
5750 _protection_domain,
5751 cl_inst_info.class_data(),
5752 CHECK);
5753
5754 assert(_all_mirandas != nullptr, "invariant");
5755
5756 // Generate any default methods - default methods are public interface methods
5757 // that have a default implementation. This is new with Java 8.
5758 if (_has_nonstatic_concrete_methods) {
5759 DefaultMethods::generate_default_methods(ik,
5760 _all_mirandas,
5761 CHECK);
5762 }
5763
5764 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5765 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5766 !module_entry->has_default_read_edges()) {
5767 if (!module_entry->set_has_default_read_edges()) {
5768 // We won a potential race
5769 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5770 }
5771 }
5772
5773 bool all_fields_empty = true;
5774 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
5775 if (!fs.access_flags().is_static()) {
5776 if (fs.field_descriptor().is_null_free_inline_type()) {
5777 Klass* k = _inline_type_field_klasses->at(fs.index());
5778 ik->set_inline_type_field_klass(fs.index(), k);
5779 if (!InlineKlass::cast(k)->is_empty_inline_type()) { all_fields_empty = false; }
5780 } else {
5781 all_fields_empty = false;
5782 }
5783 } else if (is_inline_type() && (fs.name() == vmSymbols::default_value_name())) {
5784 InlineKlass::cast(ik)->set_default_value_offset(ik->field_offset(fs.index()));
5785 }
5786 }
5787
5788 if (_is_empty_inline_type || (is_inline_type() && all_fields_empty)) {
5789 ik->set_is_empty_inline_type();
5790 }
5791
5792 if (is_inline_type()) {
5793 InlineKlass* vk = InlineKlass::cast(ik);
5794 vk->set_alignment(_alignment);
5795 vk->set_first_field_offset(_first_field_offset);
5796 vk->set_exact_size_in_bytes(_exact_size_in_bytes);
5797 InlineKlass::cast(ik)->initialize_calling_convention(CHECK);
5798 }
5799
5800 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5801
5802 if (!is_internal()) {
5803 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5804
5805 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5806 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5807 log_is_enabled(Info, class, preview)) {
5808 ResourceMark rm;
5809 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5810 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5811 }
5812
5813 if (log_is_enabled(Debug, class, resolve)) {
5814 ResourceMark rm;
5815 // print out the superclass.
5816 const char * from = ik->external_name();
5817 if (ik->java_super() != nullptr) {
5818 log_debug(class, resolve)("%s %s (super)",
5819 from,
5820 ik->java_super()->external_name());
5821 }
5822 // print out each of the interface classes referred to by this class.
5823 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5824 if (local_interfaces != nullptr) {
5825 const int length = local_interfaces->length();
5826 for (int i = 0; i < length; i++) {
5827 const InstanceKlass* const k = local_interfaces->at(i);
5828 const char * to = k->external_name();
5829 log_debug(class, resolve)("%s %s (interface)", from, to);
5830 }
5831 }
5832 }
5833 }
5834
5835 JFR_ONLY(INIT_ID(ik);)
5836
5837 // If we reach here, all is well.
5838 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5839 // in order for it to not be destroyed in the ClassFileParser destructor.
5840 set_klass_to_deallocate(nullptr);
5841
5842 // it's official
5843 set_klass(ik);
5844
5845 debug_only(ik->verify();)
5846 }
5847
5848 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5849 // Decrement the refcount in the old name, since we're clobbering it.
5850 _class_name->decrement_refcount();
5851
5852 _class_name = new_class_name;
5853 // Increment the refcount of the new name.
5854 // Now the ClassFileParser owns this name and will decrement in
5855 // the destructor.
5856 _class_name->increment_refcount();
5857 }
5858
5859 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5860 bool trusted = loader_data->is_boot_class_loader_data() ||
5861 loader_data->is_platform_class_loader_data();
5862 bool need_verify =
5863 // verifyAll
5864 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5865 // verifyRemote
5866 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5867 return !need_verify;
5868 }
5869
5870 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5871 Symbol* name,
5872 ClassLoaderData* loader_data,
5873 const ClassLoadInfo* cl_info,
5874 Publicity pub_level,
5875 TRAPS) :
5876 _stream(stream),
5877 _class_name(nullptr),
5878 _loader_data(loader_data),
5879 _is_hidden(cl_info->is_hidden()),
5880 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5881 _orig_cp_size(0),
5882 _super_klass(),
5883 _cp(nullptr),
5884 _fieldinfo_stream(nullptr),
5885 _fields_status(nullptr),
5886 _methods(nullptr),
5887 _inner_classes(nullptr),
5888 _nest_members(nullptr),
5889 _nest_host(0),
5890 _permitted_subclasses(nullptr),
5891 _preload_classes(nullptr),
5892 _record_components(nullptr),
5893 _local_interfaces(nullptr),
5894 _local_interface_indexes(nullptr),
5895 _transitive_interfaces(nullptr),
5896 _combined_annotations(nullptr),
5897 _class_annotations(nullptr),
5898 _class_type_annotations(nullptr),
5899 _fields_annotations(nullptr),
5900 _fields_type_annotations(nullptr),
5901 _klass(nullptr),
5902 _klass_to_deallocate(nullptr),
5903 _parsed_annotations(nullptr),
5904 _fac(nullptr),
5905 _field_info(nullptr),
5906 _inline_type_field_klasses(nullptr),
5907 _temp_field_info(nullptr),
5908 _method_ordering(nullptr),
5909 _all_mirandas(nullptr),
5910 _vtable_size(0),
5911 _itable_size(0),
5912 _num_miranda_methods(0),
5913 _protection_domain(cl_info->protection_domain()),
5914 _access_flags(),
5915 _pub_level(pub_level),
5916 _bad_constant_seen(0),
5917 _synthetic_flag(false),
5918 _sde_length(false),
5919 _sde_buffer(nullptr),
5920 _sourcefile_index(0),
5921 _generic_signature_index(0),
5922 _major_version(0),
5923 _minor_version(0),
5924 _this_class_index(0),
5925 _super_class_index(0),
5926 _itfs_len(0),
5927 _java_fields_count(0),
5928 _need_verify(false),
5929 _relax_verify(false),
5930 _has_nonstatic_concrete_methods(false),
5931 _declares_nonstatic_concrete_methods(false),
5932 _has_localvariable_table(false),
5933 _has_final_method(false),
5934 _has_contended_fields(false),
5935 _has_inline_type_fields(false),
5936 _has_nonstatic_fields(false),
5937 _is_empty_inline_type(false),
5938 _is_naturally_atomic(false),
5939 _is_declared_atomic(false),
5940 _carries_value_modifier(false),
5941 _carries_identity_modifier(false),
5942 _has_finalizer(false),
5943 _has_empty_finalizer(false),
5944 _has_vanilla_constructor(false),
5945 _max_bootstrap_specifier_index(-1) {
5946
5947 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5948 _class_name->increment_refcount();
5949
5950 assert(_loader_data != nullptr, "invariant");
5951 assert(stream != nullptr, "invariant");
5952 assert(_stream != nullptr, "invariant");
5953 assert(_stream->buffer() == _stream->current(), "invariant");
5954 assert(_class_name != nullptr, "invariant");
5955 assert(0 == _access_flags.as_int(), "invariant");
5956
5957 // Figure out whether we can skip format checking (matching classic VM behavior)
5958 if (DumpSharedSpaces) {
5959 // verify == true means it's a 'remote' class (i.e., non-boot class)
5960 // Verification decision is based on BytecodeVerificationRemote flag
5961 // for those classes.
5962 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5963 BytecodeVerificationLocal;
5964 }
5965 else {
5966 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5967 stream->need_verify());
5968 }
5969
5970 // synch back verification state to stream
5971 stream->set_verify(_need_verify);
5972
5973 // Check if verification needs to be relaxed for this class file
5974 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5975 _relax_verify = relax_format_check_for(_loader_data);
5976
5977 parse_stream(stream, CHECK);
5978
5979 post_process_parsed_stream(stream, _cp, CHECK);
5980 }
5981
5982 void ClassFileParser::clear_class_metadata() {
5983 // metadata created before the instance klass is created. Must be
5984 // deallocated if classfile parsing returns an error.
5985 _cp = nullptr;
5986 _fieldinfo_stream = nullptr;
5987 _fields_status = nullptr;
5988 _methods = nullptr;
5989 _inner_classes = nullptr;
5990 _nest_members = nullptr;
5991 _permitted_subclasses = nullptr;
5992 _preload_classes = nullptr;
5993 _combined_annotations = nullptr;
5994 _class_annotations = _class_type_annotations = nullptr;
5995 _fields_annotations = _fields_type_annotations = nullptr;
5996 _record_components = nullptr;
5997 }
5998
5999 // Destructor to clean up
6000 ClassFileParser::~ClassFileParser() {
6001 _class_name->decrement_refcount();
6002
6003 if (_cp != nullptr) {
6004 MetadataFactory::free_metadata(_loader_data, _cp);
6005 }
6006
6007 if (_fieldinfo_stream != nullptr) {
6008 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
6009 }
6010
6011 if (_fields_status != nullptr) {
6012 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
6013 }
6014
6015 if (_inline_type_field_klasses != nullptr) {
6016 MetadataFactory::free_array<InlineKlass*>(_loader_data, _inline_type_field_klasses);
6017 }
6018
6019 if (_methods != nullptr) {
6020 // Free methods
6021 InstanceKlass::deallocate_methods(_loader_data, _methods);
6022 }
6023
6024 // beware of the Universe::empty_blah_array!!
6025 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
6026 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6027 }
6028
6029 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
6030 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6031 }
6032
6033 if (_record_components != nullptr) {
6034 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6035 }
6036
6037 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
6038 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
6039 }
6040
6041 if (_preload_classes != nullptr && _preload_classes != Universe::the_empty_short_array()) {
6042 MetadataFactory::free_array<u2>(_loader_data, _preload_classes);
6043 }
6044
6045 // Free interfaces
6046 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6047 _local_interfaces, _transitive_interfaces);
6048
6049 if (_combined_annotations != nullptr) {
6050 // After all annotations arrays have been created, they are installed into the
6051 // Annotations object that will be assigned to the InstanceKlass being created.
6052
6053 // Deallocate the Annotations object and the installed annotations arrays.
6054 _combined_annotations->deallocate_contents(_loader_data);
6055
6056 // If the _combined_annotations pointer is non-null,
6057 // then the other annotations fields should have been cleared.
6058 assert(_class_annotations == nullptr, "Should have been cleared");
6059 assert(_class_type_annotations == nullptr, "Should have been cleared");
6060 assert(_fields_annotations == nullptr, "Should have been cleared");
6061 assert(_fields_type_annotations == nullptr, "Should have been cleared");
6062 } else {
6063 // If the annotations arrays were not installed into the Annotations object,
6064 // then they have to be deallocated explicitly.
6065 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6066 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6067 Annotations::free_contents(_loader_data, _fields_annotations);
6068 Annotations::free_contents(_loader_data, _fields_type_annotations);
6069 }
6070
6071 clear_class_metadata();
6072 _transitive_interfaces = nullptr;
6073 _local_interfaces = nullptr;
6074
6075 // deallocate the klass if already created. Don't directly deallocate, but add
6076 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6077 // at a safepoint.
6078 if (_klass_to_deallocate != nullptr) {
6079 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6080 }
6081 }
6082
6083 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6084 TRAPS) {
6085
6086 assert(stream != nullptr, "invariant");
6087 assert(_class_name != nullptr, "invariant");
6088
6089 // BEGIN STREAM PARSING
6090 stream->guarantee_more(8, CHECK); // magic, major, minor
6091 // Magic value
6092 const u4 magic = stream->get_u4_fast();
6093 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6094 "Incompatible magic value %u in class file %s",
6095 magic, CHECK);
6096
6097 // Version numbers
6098 _minor_version = stream->get_u2_fast();
6099 _major_version = stream->get_u2_fast();
6100
6101 // Check version numbers - we check this even with verifier off
6102 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6103
6104 stream->guarantee_more(3, CHECK); // length, first cp tag
6105 u2 cp_size = stream->get_u2_fast();
6106
6107 guarantee_property(
6108 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6109 cp_size, CHECK);
6110
6111 _orig_cp_size = cp_size;
6112 if (is_hidden()) { // Add a slot for hidden class name.
6113 cp_size++;
6114 }
6115
6116 _cp = ConstantPool::allocate(_loader_data,
6117 cp_size,
6118 CHECK);
6119
6120 ConstantPool* const cp = _cp;
6121
6122 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6123
6124 assert(cp_size == (u2)cp->length(), "invariant");
6125
6126 // ACCESS FLAGS
6127 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6128
6129 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6130 // JVM_ACC_MODULE is defined in JDK-9 and later.
6131 if (_major_version >= JAVA_9_VERSION) {
6132 recognized_modifiers |= JVM_ACC_MODULE;
6133 }
6134 // JVM_ACC_VALUE and JVM_ACC_PRIMITIVE supported version
6135 if (supports_inline_types()) {
6136 recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE;
6137 }
6138
6139 // Access flags
6140 jint flags = stream->get_u2_fast() & recognized_modifiers;
6141
6142 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6143 // Set abstract bit for old class files for backward compatibility
6144 flags |= JVM_ACC_ABSTRACT;
6145 }
6146
6147 // This class and superclass
6148 _this_class_index = stream->get_u2_fast();
6149 check_property(
6150 valid_cp_range(_this_class_index, cp_size) &&
6151 cp->tag_at(_this_class_index).is_unresolved_klass(),
6152 "Invalid this class index %u in constant pool in class file %s",
6153 _this_class_index, CHECK);
6154
6155 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6156 assert(class_name_in_cp != nullptr, "class_name can't be null");
6157
6158 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
6159
6160 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
6161
6162 if (EnableValhalla) {
6163 if(!supports_inline_types()) {
6164 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6165 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6166 if (!is_module && !is_interface && !is_java_lang_Object) {
6167 flags |= JVM_ACC_IDENTITY;
6168 }
6169 }
6170 }
6171
6172 _access_flags.set_flags(flags);
6173
6174 if (EnableValhalla) {
6175 if (_access_flags.is_identity_class()) set_carries_identity_modifier();
6176 if (_access_flags.is_value_class()) set_carries_value_modifier();
6177 if (carries_identity_modifier() && carries_value_modifier()) {
6178 classfile_parse_error("Class %s has both ACC_IDENTITY and ACC_VALUE modifiers", THREAD);
6179 }
6180 }
6181
6182 short bad_constant = class_bad_constant_seen();
6183 if (bad_constant != 0) {
6184 // Do not throw CFE until after the access_flags are checked because if
6185 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6186 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6187 return;
6188 }
6189
6190 // Don't need to check whether this class name is legal or not.
6191 // It has been checked when constant pool is parsed.
6192 // However, make sure it is not an array type.
6193 if (_need_verify) {
6194 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6195 "Bad class name in class file %s",
6196 CHECK);
6197 }
6198
6199 #ifdef ASSERT
6200 // Basic sanity checks
6201 if (_is_hidden) {
6202 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6203 }
6204 #endif
6205
6206 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
6207
6208 if (_is_hidden) {
6209 assert(_class_name != nullptr, "Unexpected null _class_name");
6210 #ifdef ASSERT
6211 if (_need_verify) {
6212 verify_legal_class_name(_class_name, CHECK);
6213 }
6214 #endif
6215
6216 } else {
6217 // Check if name in class file matches given name
6218 if (_class_name != class_name_in_cp) {
6219 if (_class_name != vmSymbols::unknown_class_name()) {
6220 ResourceMark rm(THREAD);
6221 Exceptions::fthrow(THREAD_AND_LOCATION,
6222 vmSymbols::java_lang_NoClassDefFoundError(),
6223 "%s (wrong name: %s)",
6224 _class_name->as_C_string(),
6225 class_name_in_cp->as_C_string()
6226 );
6227 return;
6228 } else {
6229 // The class name was not known by the caller so we set it from
6230 // the value in the CP.
6231 update_class_name(class_name_in_cp);
6232 }
6233 // else nothing to do: the expected class name matches what is in the CP
6234 }
6235 }
6236
6237 // Verification prevents us from creating names with dots in them, this
6238 // asserts that that's the case.
6239 assert(is_internal_format(_class_name), "external class name format used internally");
6240
6241 if (!is_internal()) {
6242 LogTarget(Debug, class, preorder) lt;
6243 if (lt.is_enabled()){
6244 ResourceMark rm(THREAD);
6245 LogStream ls(lt);
6246 ls.print("%s", _class_name->as_klass_external_name());
6247 if (stream->source() != nullptr) {
6248 ls.print(" source: %s", stream->source());
6249 }
6250 ls.cr();
6251 }
6252 }
6253
6254 // SUPERKLASS
6255 _super_class_index = stream->get_u2_fast();
6256 _super_klass = parse_super_class(cp,
6257 _super_class_index,
6258 _need_verify,
6259 CHECK);
6260
6261 // Interfaces
6262 _itfs_len = stream->get_u2_fast();
6263 parse_interfaces(stream,
6264 _itfs_len,
6265 cp,
6266 &_has_nonstatic_concrete_methods,
6267 &_is_declared_atomic,
6268 CHECK);
6269
6270 // Fields (offsets are filled in later)
6271 _fac = new FieldAllocationCount();
6272 parse_fields(stream,
6273 _access_flags,
6274 _fac,
6275 cp,
6276 cp_size,
6277 &_java_fields_count,
6278 CHECK);
6279
6280 assert(_temp_field_info != nullptr, "invariant");
6281
6282 // Methods
6283 parse_methods(stream,
6284 is_interface(),
6285 is_value_class(),
6286 is_abstract_class(),
6287 &_has_localvariable_table,
6288 &_has_final_method,
6289 &_declares_nonstatic_concrete_methods,
6290 CHECK);
6291
6292 assert(_methods != nullptr, "invariant");
6293
6294 if (_declares_nonstatic_concrete_methods) {
6295 _has_nonstatic_concrete_methods = true;
6296 }
6297
6298 // Additional attributes/annotations
6299 _parsed_annotations = new ClassAnnotationCollector();
6300 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6301
6302 assert(_inner_classes != nullptr, "invariant");
6303
6304 // Finalize the Annotations metadata object,
6305 // now that all annotation arrays have been created.
6306 create_combined_annotations(CHECK);
6307
6308 // Make sure this is the end of class file stream
6309 guarantee_property(stream->at_eos(),
6310 "Extra bytes at the end of class file %s",
6311 CHECK);
6312
6313 // all bytes in stream read and parsed
6314 }
6315
6316 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6317 ResourceMark rm;
6318 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6319 // use a '/' because that confuses finding the class's package. Also, can't
6320 // use an illegal char such as ';' because that causes serialization issues
6321 // and issues with hidden classes that create their own hidden classes.
6322 char addr_buf[20];
6323 if (DumpSharedSpaces) {
6324 // We want stable names for the archived hidden classes (only for static
6325 // archive for now). Spaces under default_SharedBaseAddress() will be
6326 // occupied by the archive at run time, so we know that no dynamically
6327 // loaded InstanceKlass will be placed under there.
6328 static volatile size_t counter = 0;
6329 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6330 size_t new_id = Atomic::add(&counter, (size_t)1);
6331 jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
6332 } else {
6333 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6334 }
6335 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6336 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6337 jio_snprintf(new_name, new_name_len, "%s+%s",
6338 _class_name->as_C_string(), addr_buf);
6339 update_class_name(SymbolTable::new_symbol(new_name));
6340
6341 // Add a Utf8 entry containing the hidden name.
6342 assert(_class_name != nullptr, "Unexpected null _class_name");
6343 int hidden_index = _orig_cp_size; // this is an extra slot we added
6344 _cp->symbol_at_put(hidden_index, _class_name);
6345
6346 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6347 // We have to update the resolved_klass_index and the name_index together
6348 // so extract the existing resolved_klass_index first.
6349 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6350 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6351 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6352 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6353 "Bad name_index");
6354 }
6355
6356 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6357 ConstantPool* cp,
6358 TRAPS) {
6359 assert(stream != nullptr, "invariant");
6360 assert(stream->at_eos(), "invariant");
6361 assert(cp != nullptr, "invariant");
6362 assert(_loader_data != nullptr, "invariant");
6363
6364 if (_class_name == vmSymbols::java_lang_Object()) {
6365 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6366 "java.lang.Object cannot implement an interface in class file %s",
6367 CHECK);
6368 }
6369 // We check super class after class file is parsed and format is checked
6370 if (_super_class_index > 0 && nullptr == _super_klass) {
6371 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6372 if (is_interface()) {
6373 // Before attempting to resolve the superclass, check for class format
6374 // errors not checked yet.
6375 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6376 "Interfaces must have java.lang.Object as superclass in class file %s",
6377 CHECK);
6378 }
6379 Handle loader(THREAD, _loader_data->class_loader());
6380 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6381 _super_klass = vmClasses::Object_klass();
6382 } else {
6383 _super_klass = (const InstanceKlass*)
6384 SystemDictionary::resolve_super_or_fail(_class_name,
6385 super_class_name,
6386 loader,
6387 _protection_domain,
6388 true,
6389 CHECK);
6390 }
6391 }
6392
6393 if (_super_klass != nullptr) {
6394 if (_super_klass->is_interface()) {
6395 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6396 return;
6397 }
6398
6399 if (EnableValhalla) {
6400 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6401 }
6402
6403 if (_super_klass->has_nonstatic_concrete_methods()) {
6404 _has_nonstatic_concrete_methods = true;
6405 }
6406 if (_super_klass->is_declared_atomic()) {
6407 _is_declared_atomic = true;
6408 }
6409 }
6410
6411 if (*ForceNonTearable != '\0') {
6412 // Allow a command line switch to force the same atomicity property:
6413 const char* class_name_str = _class_name->as_C_string();
6414 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6415 _is_declared_atomic = true;
6416 }
6417 }
6418
6419 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6420 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6421 if (_local_interface_indexes != nullptr) {
6422 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6423 u2 interface_index = _local_interface_indexes->at(i);
6424 Klass* interf;
6425 if (cp->tag_at(interface_index).is_klass()) {
6426 interf = cp->resolved_klass_at(interface_index);
6427 } else {
6428 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6429
6430 // Don't need to check legal name because it's checked when parsing constant pool.
6431 // But need to make sure it's not an array type.
6432 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6433 "Bad interface name in class file %s", CHECK);
6434
6435 // Call resolve_super so class circularity is checked
6436 interf = SystemDictionary::resolve_super_or_fail(
6437 _class_name,
6438 unresolved_klass,
6439 Handle(THREAD, _loader_data->class_loader()),
6440 _protection_domain,
6441 false,
6442 CHECK);
6443 }
6444
6445 if (!interf->is_interface()) {
6446 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6447 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6448 _class_name->as_klass_external_name(),
6449 interf->external_name(),
6450 interf->class_in_module_of_loader()));
6451 }
6452
6453 if (EnableValhalla) {
6454 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6455 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6456 }
6457
6458 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6459 _has_nonstatic_concrete_methods = true;
6460 }
6461 if (InstanceKlass::cast(interf)->is_declared_atomic()) {
6462 _is_declared_atomic = true;
6463 }
6464 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6465 }
6466 }
6467 assert(_local_interfaces != nullptr, "invariant");
6468
6469 // Compute the transitive list of all unique interfaces implemented by this class
6470 _transitive_interfaces =
6471 compute_transitive_interfaces(_super_klass,
6472 _local_interfaces,
6473 _loader_data,
6474 CHECK);
6475
6476 assert(_transitive_interfaces != nullptr, "invariant");
6477
6478 // sort methods
6479 _method_ordering = sort_methods(_methods);
6480
6481 _all_mirandas = new GrowableArray<Method*>(20);
6482
6483 Handle loader(THREAD, _loader_data->class_loader());
6484 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6485 &_num_miranda_methods,
6486 _all_mirandas,
6487 _super_klass,
6488 _methods,
6489 _access_flags,
6490 _major_version,
6491 loader,
6492 _class_name,
6493 _local_interfaces);
6494
6495 // Size of Java itable (in words)
6496 _itable_size = is_interface() ? 0 :
6497 klassItable::compute_itable_size(_transitive_interfaces);
6498
6499 assert(_fac != nullptr, "invariant");
6500 assert(_parsed_annotations != nullptr, "invariant");
6501
6502
6503 if (EnablePrimitiveClasses) {
6504 _inline_type_field_klasses = MetadataFactory::new_array<InlineKlass*>(_loader_data,
6505 java_fields_count(),
6506 nullptr,
6507 CHECK);
6508 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6509 FieldInfo fieldinfo = *it;
6510 Symbol* sig = fieldinfo.signature(cp);
6511
6512 if (fieldinfo.field_flags().is_null_free_inline_type() && !fieldinfo.access_flags().is_static()) {
6513 // Pre-load inline class
6514 Klass* klass = SystemDictionary::resolve_inline_type_field_or_fail(sig,
6515 Handle(THREAD, _loader_data->class_loader()),
6516 _protection_domain, true, CHECK);
6517 assert(klass != nullptr, "Sanity check");
6518 if (!klass->access_flags().is_value_class()) {
6519 assert(klass->is_instance_klass(), "Sanity check");
6520 ResourceMark rm(THREAD);
6521 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6522 err_msg("Class %s expects class %s to be an inline type, but it is not",
6523 _class_name->as_C_string(),
6524 InstanceKlass::cast(klass)->external_name()));
6525 }
6526 _inline_type_field_klasses->at_put(fieldinfo.index(), InlineKlass::cast(klass));
6527 }
6528 }
6529 }
6530
6531 _field_info = new FieldLayoutInfo();
6532 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6533 _parsed_annotations->is_contended(), is_inline_type(),
6534 _field_info, _inline_type_field_klasses);
6535 lb.build_layout(CHECK);
6536 if (is_inline_type()) {
6537 _alignment = lb.get_alignment();
6538 _first_field_offset = lb.get_first_field_offset();
6539 _exact_size_in_bytes = lb.get_exact_size_in_byte();
6540 }
6541 _has_inline_type_fields = _field_info->_has_inline_fields;
6542
6543 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6544 _fieldinfo_stream =
6545 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6546 injected_fields_count, loader_data(), CHECK);
6547 _fields_status =
6548 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6549 FieldStatus(0), CHECK);
6550 }
6551
6552 void ClassFileParser::set_klass(InstanceKlass* klass) {
6553
6554 #ifdef ASSERT
6555 if (klass != nullptr) {
6556 assert(nullptr == _klass, "leaking?");
6557 }
6558 #endif
6559
6560 _klass = klass;
6561 }
6562
6563 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6564
6565 #ifdef ASSERT
6566 if (klass != nullptr) {
6567 assert(nullptr == _klass_to_deallocate, "leaking?");
6568 }
6569 #endif
6570
6571 _klass_to_deallocate = klass;
6572 }
6573
6574 // Caller responsible for ResourceMark
6575 // clone stream with rewound position
6576 const ClassFileStream* ClassFileParser::clone_stream() const {
6577 assert(_stream != nullptr, "invariant");
6578
6579 return _stream->clone();
6580 }
6581
6582 ReferenceType ClassFileParser::super_reference_type() const {
6583 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6584 }
6585
6586 bool ClassFileParser::is_instance_ref_klass() const {
6587 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6588 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6589 // klass requiring special treatment in ref-processing. The abstract
6590 // j.l.r.Reference cannot be instantiated so doesn't partake in
6591 // ref-processing.
6592 return is_java_lang_ref_Reference_subclass();
6593 }
6594
6595 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6596 if (_super_klass == nullptr) {
6597 return false;
6598 }
6599
6600 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6601 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6602 return true;
6603 }
6604
6605 return _super_klass->reference_type() != REF_NONE;
6606 }
6607
6608 // ----------------------------------------------------------------------------
6609 // debugging
6610
6611 #ifdef ASSERT
6612
6613 // return true if class_name contains no '.' (internal format is '/')
6614 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6615 if (class_name != nullptr) {
6616 ResourceMark rm;
6617 char* name = class_name->as_C_string();
6618 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6619 } else {
6620 return true;
6621 }
6622 }
6623
6624 #endif