1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "oops/inlineKlass.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoadInfo.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/inlineKlass.inline.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/klassVtable.hpp"
60 #include "oops/metadata.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiThreadState.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/fieldDescriptor.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/safepointVerifiers.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/timer.hpp"
77 #include "services/classLoadingService.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/bitMap.inline.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/exceptions.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/resourceHash.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95 #if INCLUDE_JFR
96 #include "jfr/support/jfrTraceIdExtension.hpp"
97 #endif
98
99 // We generally try to create the oops directly when parsing, rather than
100 // allocating temporary data structures and copying the bytes twice. A
101 // temporary area is only needed when parsing utf8 entries in the constant
102 // pool and when parsing line number tables.
103
104 // We add assert in debug mode when class format is not checked.
105
106 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
107 #define JAVA_MIN_SUPPORTED_VERSION 45
108 #define JAVA_PREVIEW_MINOR_VERSION 65535
109
110 // Used for two backward compatibility reasons:
111 // - to check for new additions to the class file format in JDK1.5
112 // - to check for bug fixes in the format checker in JDK1.5
113 #define JAVA_1_5_VERSION 49
114
115 // Used for backward compatibility reasons:
116 // - to check for javac bug fixes that happened after 1.5
117 // - also used as the max version when running in jdk6
118 #define JAVA_6_VERSION 50
119
120 // Used for backward compatibility reasons:
121 // - to disallow argument and require ACC_STATIC for <clinit> methods
122 #define JAVA_7_VERSION 51
123
124 // Extension method support.
125 #define JAVA_8_VERSION 52
126
127 #define JAVA_9_VERSION 53
128
129 #define JAVA_10_VERSION 54
130
131 #define JAVA_11_VERSION 55
132
133 #define JAVA_12_VERSION 56
134
135 #define JAVA_13_VERSION 57
136
137 #define JAVA_14_VERSION 58
138
139 #define JAVA_15_VERSION 59
140
141 #define JAVA_16_VERSION 60
142
143 #define JAVA_17_VERSION 61
144
145 #define JAVA_18_VERSION 62
146
147 #define JAVA_19_VERSION 63
148
149 #define JAVA_20_VERSION 64
150
151 #define JAVA_21_VERSION 65
152
153 #define JAVA_22_VERSION 66
154
155 #define JAVA_23_VERSION 67
156
157 #define CONSTANT_CLASS_DESCRIPTORS 69
158
159 #define JAVA_24_VERSION 68
160
161 #define JAVA_25_VERSION 69
162
163 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
164 assert((bad_constant == JVM_CONSTANT_Module ||
165 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
166 "Unexpected bad constant pool entry");
167 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
168 }
169
170 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
171 ConstantPool* cp,
172 const int length,
173 TRAPS) {
174 assert(stream != nullptr, "invariant");
175 assert(cp != nullptr, "invariant");
176
177 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
178 // this function (_current can be allocated in a register, with scalar
179 // replacement of aggregates). The _current pointer is copied back to
180 // stream() when this function returns. DON'T call another method within
181 // this method that uses stream().
182 const ClassFileStream cfs1 = *stream;
183 const ClassFileStream* const cfs = &cfs1;
184
185 DEBUG_ONLY(const u1* const old_current = stream->current();)
186
187 // Used for batching symbol allocations.
188 const char* names[SymbolTable::symbol_alloc_batch_size];
189 int lengths[SymbolTable::symbol_alloc_batch_size];
190 int indices[SymbolTable::symbol_alloc_batch_size];
191 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
192 int names_count = 0;
193
194 // parsing Index 0 is unused
195 for (int index = 1; index < length; index++) {
196 // Each of the following case guarantees one more byte in the stream
197 // for the following tag or the access_flags following constant pool,
198 // so we don't need bounds-check for reading tag.
199 const u1 tag = cfs->get_u1_fast();
200 switch (tag) {
201 case JVM_CONSTANT_Class: {
202 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
203 const u2 name_index = cfs->get_u2_fast();
204 cp->klass_index_at_put(index, name_index);
205 break;
206 }
207 case JVM_CONSTANT_Fieldref: {
208 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
209 const u2 class_index = cfs->get_u2_fast();
210 const u2 name_and_type_index = cfs->get_u2_fast();
211 cp->field_at_put(index, class_index, name_and_type_index);
212 break;
213 }
214 case JVM_CONSTANT_Methodref: {
215 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
216 const u2 class_index = cfs->get_u2_fast();
217 const u2 name_and_type_index = cfs->get_u2_fast();
218 cp->method_at_put(index, class_index, name_and_type_index);
219 break;
220 }
221 case JVM_CONSTANT_InterfaceMethodref: {
222 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
223 const u2 class_index = cfs->get_u2_fast();
224 const u2 name_and_type_index = cfs->get_u2_fast();
225 cp->interface_method_at_put(index, class_index, name_and_type_index);
226 break;
227 }
228 case JVM_CONSTANT_String : {
229 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
230 const u2 string_index = cfs->get_u2_fast();
231 cp->string_index_at_put(index, string_index);
232 break;
233 }
234 case JVM_CONSTANT_MethodHandle :
235 case JVM_CONSTANT_MethodType: {
236 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
237 classfile_parse_error(
238 "Class file version does not support constant tag %u in class file %s",
239 tag, THREAD);
240 return;
241 }
242 if (tag == JVM_CONSTANT_MethodHandle) {
243 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
244 const u1 ref_kind = cfs->get_u1_fast();
245 const u2 method_index = cfs->get_u2_fast();
246 cp->method_handle_index_at_put(index, ref_kind, method_index);
247 }
248 else if (tag == JVM_CONSTANT_MethodType) {
249 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
250 const u2 signature_index = cfs->get_u2_fast();
251 cp->method_type_index_at_put(index, signature_index);
252 }
253 else {
254 ShouldNotReachHere();
255 }
256 break;
257 }
258 case JVM_CONSTANT_Dynamic : {
259 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
260 classfile_parse_error(
261 "Class file version does not support constant tag %u in class file %s",
262 tag, THREAD);
263 return;
264 }
265 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
266 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
267 const u2 name_and_type_index = cfs->get_u2_fast();
268 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
269 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
270 }
271 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
272 break;
273 }
274 case JVM_CONSTANT_InvokeDynamic : {
275 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
276 classfile_parse_error(
277 "Class file version does not support constant tag %u in class file %s",
278 tag, THREAD);
279 return;
280 }
281 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
282 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
283 const u2 name_and_type_index = cfs->get_u2_fast();
284 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
285 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
286 }
287 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
288 break;
289 }
290 case JVM_CONSTANT_Integer: {
291 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
292 const u4 bytes = cfs->get_u4_fast();
293 cp->int_at_put(index, (jint)bytes);
294 break;
295 }
296 case JVM_CONSTANT_Float: {
297 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
298 const u4 bytes = cfs->get_u4_fast();
299 cp->float_at_put(index, *(jfloat*)&bytes);
300 break;
301 }
302 case JVM_CONSTANT_Long: {
303 // A mangled type might cause you to overrun allocated memory
304 guarantee_property(index + 1 < length,
305 "Invalid constant pool entry %u in class file %s",
306 index,
307 CHECK);
308 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
309 const u8 bytes = cfs->get_u8_fast();
310 cp->long_at_put(index, bytes);
311 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
312 break;
313 }
314 case JVM_CONSTANT_Double: {
315 // A mangled type might cause you to overrun allocated memory
316 guarantee_property(index+1 < length,
317 "Invalid constant pool entry %u in class file %s",
318 index,
319 CHECK);
320 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
321 const u8 bytes = cfs->get_u8_fast();
322 cp->double_at_put(index, *(jdouble*)&bytes);
323 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
324 break;
325 }
326 case JVM_CONSTANT_NameAndType: {
327 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
328 const u2 name_index = cfs->get_u2_fast();
329 const u2 signature_index = cfs->get_u2_fast();
330 cp->name_and_type_at_put(index, name_index, signature_index);
331 break;
332 }
333 case JVM_CONSTANT_Utf8 : {
334 cfs->guarantee_more(2, CHECK); // utf8_length
335 u2 utf8_length = cfs->get_u2_fast();
336 const u1* utf8_buffer = cfs->current();
337 assert(utf8_buffer != nullptr, "null utf8 buffer");
338 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
339 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
340 cfs->skip_u1_fast(utf8_length);
341
342 // Before storing the symbol, make sure it's legal
343 if (_need_verify) {
344 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
345 }
346
347 unsigned int hash;
348 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
349 utf8_length,
350 hash);
351 if (result == nullptr) {
352 names[names_count] = (const char*)utf8_buffer;
353 lengths[names_count] = utf8_length;
354 indices[names_count] = index;
355 hashValues[names_count++] = hash;
356 if (names_count == SymbolTable::symbol_alloc_batch_size) {
357 SymbolTable::new_symbols(_loader_data,
358 constantPoolHandle(THREAD, cp),
359 names_count,
360 names,
361 lengths,
362 indices,
363 hashValues);
364 names_count = 0;
365 }
366 } else {
367 cp->symbol_at_put(index, result);
368 }
369 break;
370 }
371 case JVM_CONSTANT_Module:
372 case JVM_CONSTANT_Package: {
373 // Record that an error occurred in these two cases but keep parsing so
374 // that ACC_Module can be checked for in the access_flags. Need to
375 // throw NoClassDefFoundError in that case.
376 if (_major_version >= JAVA_9_VERSION) {
377 cfs->guarantee_more(3, CHECK);
378 cfs->get_u2_fast();
379 set_class_bad_constant_seen(tag);
380 break;
381 }
382 }
383 default: {
384 classfile_parse_error("Unknown constant tag %u in class file %s",
385 tag,
386 THREAD);
387 return;
388 }
389 } // end of switch(tag)
390 } // end of for
391
392 // Allocate the remaining symbols
393 if (names_count > 0) {
394 SymbolTable::new_symbols(_loader_data,
395 constantPoolHandle(THREAD, cp),
396 names_count,
397 names,
398 lengths,
399 indices,
400 hashValues);
401 }
402
403 // Copy _current pointer of local copy back to stream.
404 assert(stream->current() == old_current, "non-exclusive use of stream");
405 stream->set_current(cfs1.current());
406
407 }
408
409 static inline bool valid_cp_range(int index, int length) {
410 return (index > 0 && index < length);
411 }
412
413 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
414 assert(cp != nullptr, "invariant");
415 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
416 return cp->symbol_at(index);
417 }
418 return nullptr;
419 }
420
421 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
422 ConstantPool* const cp,
423 const int length,
424 TRAPS) {
425 assert(cp != nullptr, "invariant");
426 assert(stream != nullptr, "invariant");
427
428 // parsing constant pool entries
429 parse_constant_pool_entries(stream, cp, length, CHECK);
430 if (class_bad_constant_seen() != 0) {
431 // a bad CP entry has been detected previously so stop parsing and just return.
432 return;
433 }
434
435 int index = 1; // declared outside of loops for portability
436 int num_klasses = 0;
437
438 // first verification pass - validate cross references
439 // and fixup class and string constants
440 for (index = 1; index < length; index++) { // Index 0 is unused
441 const jbyte tag = cp->tag_at(index).value();
442 switch (tag) {
443 case JVM_CONSTANT_Class: {
444 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
445 break;
446 }
447 case JVM_CONSTANT_Fieldref:
448 // fall through
449 case JVM_CONSTANT_Methodref:
450 // fall through
451 case JVM_CONSTANT_InterfaceMethodref: {
452 if (!_need_verify) break;
453 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
454 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
455 guarantee_property(valid_klass_reference_at(klass_ref_index),
456 "Invalid constant pool index %u in class file %s",
457 klass_ref_index, CHECK);
458 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
459 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
460 "Invalid constant pool index %u in class file %s",
461 name_and_type_ref_index, CHECK);
462 break;
463 }
464 case JVM_CONSTANT_String: {
465 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
466 break;
467 }
468 case JVM_CONSTANT_Integer:
469 break;
470 case JVM_CONSTANT_Float:
471 break;
472 case JVM_CONSTANT_Long:
473 case JVM_CONSTANT_Double: {
474 index++;
475 guarantee_property(
476 (index < length && cp->tag_at(index).is_invalid()),
477 "Improper constant pool long/double index %u in class file %s",
478 index, CHECK);
479 break;
480 }
481 case JVM_CONSTANT_NameAndType: {
482 if (!_need_verify) break;
483 const int name_ref_index = cp->name_ref_index_at(index);
484 const int signature_ref_index = cp->signature_ref_index_at(index);
485 guarantee_property(valid_symbol_at(name_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 name_ref_index, CHECK);
488 guarantee_property(valid_symbol_at(signature_ref_index),
489 "Invalid constant pool index %u in class file %s",
490 signature_ref_index, CHECK);
491 break;
492 }
493 case JVM_CONSTANT_Utf8:
494 break;
495 case JVM_CONSTANT_UnresolvedClass: // fall-through
496 case JVM_CONSTANT_UnresolvedClassInError: {
497 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
498 break;
499 }
500 case JVM_CONSTANT_ClassIndex: {
501 const int class_index = cp->klass_index_at(index);
502 guarantee_property(valid_symbol_at(class_index),
503 "Invalid constant pool index %u in class file %s",
504 class_index, CHECK);
505
506 Symbol* const name = cp->symbol_at(class_index);
507 const unsigned int name_len = name->utf8_length();
508 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
509 break;
510 }
511 case JVM_CONSTANT_StringIndex: {
512 const int string_index = cp->string_index_at(index);
513 guarantee_property(valid_symbol_at(string_index),
514 "Invalid constant pool index %u in class file %s",
515 string_index, CHECK);
516 Symbol* const sym = cp->symbol_at(string_index);
517 cp->unresolved_string_at_put(index, sym);
518 break;
519 }
520 case JVM_CONSTANT_MethodHandle: {
521 const int ref_index = cp->method_handle_index_at(index);
522 guarantee_property(valid_cp_range(ref_index, length),
523 "Invalid constant pool index %u in class file %s",
524 ref_index, CHECK);
525 const constantTag tag = cp->tag_at(ref_index);
526 const int ref_kind = cp->method_handle_ref_kind_at(index);
527
528 switch (ref_kind) {
529 case JVM_REF_getField:
530 case JVM_REF_getStatic:
531 case JVM_REF_putField:
532 case JVM_REF_putStatic: {
533 guarantee_property(
534 tag.is_field(),
535 "Invalid constant pool index %u in class file %s (not a field)",
536 ref_index, CHECK);
537 break;
538 }
539 case JVM_REF_invokeVirtual:
540 case JVM_REF_newInvokeSpecial: {
541 guarantee_property(
542 tag.is_method(),
543 "Invalid constant pool index %u in class file %s (not a method)",
544 ref_index, CHECK);
545 break;
546 }
547 case JVM_REF_invokeStatic:
548 case JVM_REF_invokeSpecial: {
549 guarantee_property(
550 tag.is_method() ||
551 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
552 "Invalid constant pool index %u in class file %s (not a method)",
553 ref_index, CHECK);
554 break;
555 }
556 case JVM_REF_invokeInterface: {
557 guarantee_property(
558 tag.is_interface_method(),
559 "Invalid constant pool index %u in class file %s (not an interface method)",
560 ref_index, CHECK);
561 break;
562 }
563 default: {
564 classfile_parse_error(
565 "Bad method handle kind at constant pool index %u in class file %s",
566 index, THREAD);
567 return;
568 }
569 } // switch(refkind)
570 // Keep the ref_index unchanged. It will be indirected at link-time.
571 break;
572 } // case MethodHandle
573 case JVM_CONSTANT_MethodType: {
574 const int ref_index = cp->method_type_index_at(index);
575 guarantee_property(valid_symbol_at(ref_index),
576 "Invalid constant pool index %u in class file %s",
577 ref_index, CHECK);
578 break;
579 }
580 case JVM_CONSTANT_Dynamic: {
581 const int name_and_type_ref_index =
582 cp->bootstrap_name_and_type_ref_index_at(index);
583
584 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
585 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
586 "Invalid constant pool index %u in class file %s",
587 name_and_type_ref_index, CHECK);
588 // bootstrap specifier index must be checked later,
589 // when BootstrapMethods attr is available
590
591 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
592 cp->set_has_dynamic_constant();
593 break;
594 }
595 case JVM_CONSTANT_InvokeDynamic: {
596 const int name_and_type_ref_index =
597 cp->bootstrap_name_and_type_ref_index_at(index);
598
599 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
600 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
601 "Invalid constant pool index %u in class file %s",
602 name_and_type_ref_index, CHECK);
603 // bootstrap specifier index must be checked later,
604 // when BootstrapMethods attr is available
605 break;
606 }
607 default: {
608 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
609 ShouldNotReachHere();
610 break;
611 }
612 } // switch(tag)
613 } // end of for
614
615 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
616
617 if (!_need_verify) {
618 return;
619 }
620
621 // second verification pass - checks the strings are of the right format.
622 // but not yet to the other entries
623 for (index = 1; index < length; index++) {
624 const jbyte tag = cp->tag_at(index).value();
625 switch (tag) {
626 case JVM_CONSTANT_UnresolvedClass: {
627 const Symbol* const class_name = cp->klass_name_at(index);
628 // check the name
629 verify_legal_class_name(class_name, CHECK);
630 break;
631 }
632 case JVM_CONSTANT_NameAndType: {
633 if (_need_verify) {
634 const int sig_index = cp->signature_ref_index_at(index);
635 const int name_index = cp->name_ref_index_at(index);
636 const Symbol* const name = cp->symbol_at(name_index);
637 const Symbol* const sig = cp->symbol_at(sig_index);
638 guarantee_property(sig->utf8_length() != 0,
639 "Illegal zero length constant pool entry at %d in class %s",
640 sig_index, CHECK);
641 guarantee_property(name->utf8_length() != 0,
642 "Illegal zero length constant pool entry at %d in class %s",
643 name_index, CHECK);
644
645 if (Signature::is_method(sig)) {
646 // Format check method name and signature
647 verify_legal_method_name(name, CHECK);
648 verify_legal_method_signature(name, sig, CHECK);
649 } else {
650 // Format check field name and signature
651 verify_legal_field_name(name, CHECK);
652 verify_legal_field_signature(name, sig, CHECK);
653 }
654 }
655 break;
656 }
657 case JVM_CONSTANT_Dynamic: {
658 const int name_and_type_ref_index =
659 cp->uncached_name_and_type_ref_index_at(index);
660 // already verified to be utf8
661 const int name_ref_index =
662 cp->name_ref_index_at(name_and_type_ref_index);
663 // already verified to be utf8
664 const int signature_ref_index =
665 cp->signature_ref_index_at(name_and_type_ref_index);
666 const Symbol* const name = cp->symbol_at(name_ref_index);
667 const Symbol* const signature = cp->symbol_at(signature_ref_index);
668 if (_need_verify) {
669 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
670 // Need only to be sure signature is the right type.
671 if (Signature::is_method(signature)) {
672 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
673 }
674 }
675 break;
676 }
677 case JVM_CONSTANT_InvokeDynamic:
678 case JVM_CONSTANT_Fieldref:
679 case JVM_CONSTANT_Methodref:
680 case JVM_CONSTANT_InterfaceMethodref: {
681 const int name_and_type_ref_index =
682 cp->uncached_name_and_type_ref_index_at(index);
683 // already verified to be utf8
684 const int name_ref_index =
685 cp->name_ref_index_at(name_and_type_ref_index);
686 // already verified to be utf8
687 const int signature_ref_index =
688 cp->signature_ref_index_at(name_and_type_ref_index);
689 const Symbol* const name = cp->symbol_at(name_ref_index);
690 const Symbol* const signature = cp->symbol_at(signature_ref_index);
691 if (tag == JVM_CONSTANT_Fieldref) {
692 if (_need_verify) {
693 // Field name and signature are verified above, when iterating NameAndType_info.
694 // Need only to be sure signature is non-zero length and the right type.
695 if (Signature::is_method(signature)) {
696 throwIllegalSignature("Field", name, signature, CHECK);
697 }
698 }
699 } else {
700 if (_need_verify) {
701 // Method name and signature are individually verified above, when iterating
702 // NameAndType_info. Need to check here that signature is non-zero length and
703 // the right type.
704 if (!Signature::is_method(signature)) {
705 throwIllegalSignature("Method", name, signature, CHECK);
706 }
707 }
708 // If a class method name begins with '<', it must be "<init>" and have void signature.
709 const unsigned int name_len = name->utf8_length();
710 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
711 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
712 if (name != vmSymbols::object_initializer_name()) {
713 classfile_parse_error(
714 "Bad method name at constant pool index %u in class file %s",
715 name_ref_index, THREAD);
716 return;
717 } else if (!Signature::is_void_method(signature)) { // must have void signature.
718 throwIllegalSignature("Method", name, signature, CHECK);
719 }
720 }
721 }
722 break;
723 }
724 case JVM_CONSTANT_MethodHandle: {
725 const int ref_index = cp->method_handle_index_at(index);
726 const int ref_kind = cp->method_handle_ref_kind_at(index);
727 switch (ref_kind) {
728 case JVM_REF_invokeVirtual:
729 case JVM_REF_invokeStatic:
730 case JVM_REF_invokeSpecial:
731 case JVM_REF_newInvokeSpecial: {
732 const int name_and_type_ref_index =
733 cp->uncached_name_and_type_ref_index_at(ref_index);
734 const int name_ref_index =
735 cp->name_ref_index_at(name_and_type_ref_index);
736 const Symbol* const name = cp->symbol_at(name_ref_index);
737
738 if (name != vmSymbols::object_initializer_name()) { // !<init>
739 if (ref_kind == JVM_REF_newInvokeSpecial) {
740 classfile_parse_error(
741 "Bad constructor name at constant pool index %u in class file %s",
742 name_ref_index, THREAD);
743 return;
744 }
745 } else { // <init>
746 // The allowed invocation mode of <init> depends on its signature.
747 // This test corresponds to verify_invoke_instructions in the verifier.
748 const int signature_ref_index =
749 cp->signature_ref_index_at(name_and_type_ref_index);
750 const Symbol* const signature = cp->symbol_at(signature_ref_index);
751 if (signature->is_void_method_signature()
752 && ref_kind == JVM_REF_newInvokeSpecial) {
753 // OK, could be a constructor call
754 } else {
755 classfile_parse_error(
756 "Bad method name at constant pool index %u in class file %s",
757 name_ref_index, THREAD);
758 return;
759 }
760 }
761 break;
762 }
763 // Other ref_kinds are already fully checked in previous pass.
764 } // switch(ref_kind)
765 break;
766 }
767 case JVM_CONSTANT_MethodType: {
768 const Symbol* const no_name = vmSymbols::type_name(); // place holder
769 const Symbol* const signature = cp->method_type_signature_at(index);
770 verify_legal_method_signature(no_name, signature, CHECK);
771 break;
772 }
773 case JVM_CONSTANT_Utf8: {
774 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
775 }
776 } // switch(tag)
777 } // end of for
778 }
779
780 class NameSigHash: public ResourceObj {
781 public:
782 const Symbol* _name; // name
783 const Symbol* _sig; // signature
784
785 static const int HASH_ROW_SIZE = 256;
786
787 NameSigHash(Symbol* name, Symbol* sig) :
788 _name(name),
789 _sig(sig) {}
790
791 static unsigned int hash(NameSigHash const& namesig) {
792 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
793 }
794
795 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
796 return (e0._name == e1._name) &&
797 (e0._sig == e1._sig);
798 }
799 };
800
801 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
802 NameSigHash::HASH_ROW_SIZE,
803 AnyObj::RESOURCE_AREA, mtInternal,
804 &NameSigHash::hash, &NameSigHash::equals>;
805
806 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
807 assert(super_type != nullptr,"Method doesn't support null super type");
808 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
809 && super_type->name() != vmSymbols::java_lang_Object()) {
810 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
811 err_msg("Value type %s has an identity type as supertype",
812 current->class_name()->as_klass_external_name()));
813 }
814 }
815
816 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
817 int itfs_len,
818 ConstantPool* cp,
819 bool* const has_nonstatic_concrete_methods,
820 // FIXME: lots of these functions
821 // declare their parameters as const,
822 // which adds only noise to the code.
823 // Remove the spurious const modifiers.
824 // Many are of the form "const int x"
825 // or "T* const x".
826 TRAPS) {
827 assert(stream != nullptr, "invariant");
828 assert(cp != nullptr, "invariant");
829 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
830
831 if (itfs_len == 0) {
832 _local_interfaces = Universe::the_empty_instance_klass_array();
833
834 } else {
835 assert(itfs_len > 0, "only called for len>0");
836 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
837 int index = 0;
838 for (index = 0; index < itfs_len; index++) {
839 const u2 interface_index = stream->get_u2(CHECK);
840 guarantee_property(
841 valid_klass_reference_at(interface_index),
842 "Interface name has bad constant pool index %u in class file %s",
843 interface_index, CHECK);
844 _local_interface_indexes->at_put_grow(index, interface_index);
845 }
846
847 if (!_need_verify || itfs_len <= 1) {
848 return;
849 }
850
851 // Check if there's any duplicates in interfaces
852 ResourceMark rm(THREAD);
853 // Set containing interface names
854 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
855 for (index = 0; index < itfs_len; index++) {
856 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
857 // If no duplicates, add (name, nullptr) in hashtable interface_names.
858 if (!interface_names->put(interface_name, 0)) {
859 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
860 interface_name->as_C_string(), THREAD);
861 return;
862 }
863 }
864 }
865 }
866
867 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
868 int constantvalue_index,
869 int signature_index,
870 TRAPS) const {
871 // Make sure the constant pool entry is of a type appropriate to this field
872 guarantee_property(
873 (constantvalue_index > 0 &&
874 constantvalue_index < cp->length()),
875 "Bad initial value index %u in ConstantValue attribute in class file %s",
876 constantvalue_index, CHECK);
877
878 const constantTag value_type = cp->tag_at(constantvalue_index);
879 switch(cp->basic_type_for_signature_at(signature_index)) {
880 case T_LONG: {
881 guarantee_property(value_type.is_long(),
882 "Inconsistent constant value type in class file %s",
883 CHECK);
884 break;
885 }
886 case T_FLOAT: {
887 guarantee_property(value_type.is_float(),
888 "Inconsistent constant value type in class file %s",
889 CHECK);
890 break;
891 }
892 case T_DOUBLE: {
893 guarantee_property(value_type.is_double(),
894 "Inconsistent constant value type in class file %s",
895 CHECK);
896 break;
897 }
898 case T_BYTE:
899 case T_CHAR:
900 case T_SHORT:
901 case T_BOOLEAN:
902 case T_INT: {
903 guarantee_property(value_type.is_int(),
904 "Inconsistent constant value type in class file %s",
905 CHECK);
906 break;
907 }
908 case T_OBJECT: {
909 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
910 && value_type.is_string()),
911 "Bad string initial value in class file %s",
912 CHECK);
913 break;
914 }
915 default: {
916 classfile_parse_error("Unable to set initial value %u in class file %s",
917 constantvalue_index,
918 THREAD);
919 }
920 }
921 }
922
923 class AnnotationCollector : public ResourceObj{
924 public:
925 enum Location { _in_field, _in_method, _in_class };
926 enum ID {
927 _unknown = 0,
928 _method_CallerSensitive,
929 _method_ForceInline,
930 _method_DontInline,
931 _method_ChangesCurrentThread,
932 _method_JvmtiHideEvents,
933 _method_JvmtiMountTransition,
934 _method_InjectedProfile,
935 _method_LambdaForm_Compiled,
936 _method_Hidden,
937 _method_Scoped,
938 _method_IntrinsicCandidate,
939 _jdk_internal_vm_annotation_Contended,
940 _field_Stable,
941 _jdk_internal_vm_annotation_ReservedStackAccess,
942 _jdk_internal_ValueBased,
943 _jdk_internal_LooselyConsistentValue,
944 _jdk_internal_NullRestricted,
945 _java_lang_Deprecated,
946 _java_lang_Deprecated_for_removal,
947 _annotation_LIMIT
948 };
949 const Location _location;
950 int _annotations_present;
951 u2 _contended_group;
952
953 AnnotationCollector(Location location)
954 : _location(location), _annotations_present(0), _contended_group(0)
955 {
956 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
957 }
958 // If this annotation name has an ID, report it (or _none).
959 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
960 // Set the annotation name:
961 void set_annotation(ID id) {
962 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
963 _annotations_present |= (int)nth_bit((int)id);
964 }
965
966 void remove_annotation(ID id) {
967 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
968 _annotations_present &= (int)~nth_bit((int)id);
969 }
970
971 // Report if the annotation is present.
972 bool has_any_annotations() const { return _annotations_present != 0; }
973 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
974
975 void set_contended_group(u2 group) { _contended_group = group; }
976 u2 contended_group() const { return _contended_group; }
977
978 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
979
980 void set_stable(bool stable) { set_annotation(_field_Stable); }
981 bool is_stable() const { return has_annotation(_field_Stable); }
982 };
983
984 // This class also doubles as a holder for metadata cleanup.
985 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
986 private:
987 ClassLoaderData* _loader_data;
988 AnnotationArray* _field_annotations;
989 AnnotationArray* _field_type_annotations;
990 public:
991 FieldAnnotationCollector(ClassLoaderData* loader_data) :
992 AnnotationCollector(_in_field),
993 _loader_data(loader_data),
994 _field_annotations(nullptr),
995 _field_type_annotations(nullptr) {}
996 ~FieldAnnotationCollector();
997 void apply_to(FieldInfo* f);
998 AnnotationArray* field_annotations() { return _field_annotations; }
999 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1000
1001 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1002 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1003 };
1004
1005 class MethodAnnotationCollector : public AnnotationCollector{
1006 public:
1007 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1008 void apply_to(const methodHandle& m);
1009 };
1010
1011 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1012 public:
1013 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1014 void apply_to(InstanceKlass* ik);
1015 };
1016
1017
1018 static int skip_annotation_value(const u1*, int, int); // fwd decl
1019
1020 // Safely increment index by val if does not pass limit
1021 #define SAFE_ADD(index, limit, val) \
1022 if (index >= limit - val) return limit; \
1023 index += val;
1024
1025 // Skip an annotation. Return >=limit if there is any problem.
1026 static int skip_annotation(const u1* buffer, int limit, int index) {
1027 assert(buffer != nullptr, "invariant");
1028 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1029 // value := switch (tag:u1) { ... }
1030 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1031 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1032 while (--nmem >= 0 && index < limit) {
1033 SAFE_ADD(index, limit, 2); // skip member
1034 index = skip_annotation_value(buffer, limit, index);
1035 }
1036 return index;
1037 }
1038
1039 // Skip an annotation value. Return >=limit if there is any problem.
1040 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1041 assert(buffer != nullptr, "invariant");
1042
1043 // value := switch (tag:u1) {
1044 // case B, C, I, S, Z, D, F, J, c: con:u2;
1045 // case e: e_class:u2 e_name:u2;
1046 // case s: s_con:u2;
1047 // case [: do(nval:u2) {value};
1048 // case @: annotation;
1049 // case s: s_con:u2;
1050 // }
1051 SAFE_ADD(index, limit, 1); // read tag
1052 const u1 tag = buffer[index - 1];
1053 switch (tag) {
1054 case 'B':
1055 case 'C':
1056 case 'I':
1057 case 'S':
1058 case 'Z':
1059 case 'D':
1060 case 'F':
1061 case 'J':
1062 case 'c':
1063 case 's':
1064 SAFE_ADD(index, limit, 2); // skip con or s_con
1065 break;
1066 case 'e':
1067 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1068 break;
1069 case '[':
1070 {
1071 SAFE_ADD(index, limit, 2); // read nval
1072 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1073 while (--nval >= 0 && index < limit) {
1074 index = skip_annotation_value(buffer, limit, index);
1075 }
1076 }
1077 break;
1078 case '@':
1079 index = skip_annotation(buffer, limit, index);
1080 break;
1081 default:
1082 return limit; // bad tag byte
1083 }
1084 return index;
1085 }
1086
1087 // Sift through annotations, looking for those significant to the VM:
1088 static void parse_annotations(const ConstantPool* const cp,
1089 const u1* buffer, int limit,
1090 AnnotationCollector* coll,
1091 ClassLoaderData* loader_data,
1092 const bool can_access_vm_annotations) {
1093
1094 assert(cp != nullptr, "invariant");
1095 assert(buffer != nullptr, "invariant");
1096 assert(coll != nullptr, "invariant");
1097 assert(loader_data != nullptr, "invariant");
1098
1099 // annotations := do(nann:u2) {annotation}
1100 int index = 2; // read nann
1101 if (index >= limit) return;
1102 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1103 enum { // initial annotation layout
1104 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1105 count_off = 2, // u2 such as 1 (one value)
1106 member_off = 4, // utf8 such as 'value'
1107 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1108 e_tag_val = 'e',
1109 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1110 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1111 e_size = 11, // end of 'e' annotation
1112 c_tag_val = 'c', // payload is type
1113 c_con_off = 7, // utf8 payload, such as 'I'
1114 c_size = 9, // end of 'c' annotation
1115 s_tag_val = 's', // payload is String
1116 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1117 s_size = 9,
1118 b_tag_val = 'Z', // payload is boolean
1119 min_size = 6 // smallest possible size (zero members)
1120 };
1121 // Cannot add min_size to index in case of overflow MAX_INT
1122 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1123 int index0 = index;
1124 index = skip_annotation(buffer, limit, index);
1125 const u1* const abase = buffer + index0;
1126 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1127 const int count = Bytes::get_Java_u2((address)abase + count_off);
1128 const Symbol* const aname = check_symbol_at(cp, atype);
1129 if (aname == nullptr) break; // invalid annotation name
1130 const Symbol* member = nullptr;
1131 if (count >= 1) {
1132 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1133 member = check_symbol_at(cp, member_index);
1134 if (member == nullptr) break; // invalid member name
1135 }
1136
1137 // Here is where parsing particular annotations will take place.
1138 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1139 if (AnnotationCollector::_unknown == id) continue;
1140 coll->set_annotation(id);
1141 if (AnnotationCollector::_java_lang_Deprecated == id) {
1142 // @Deprecated can specify forRemoval=true, which we need
1143 // to record for JFR to use. If the annotation is not well-formed
1144 // then we may not be able to determine that.
1145 const u1* offset = abase + member_off;
1146 // There are only 2 members in @Deprecated.
1147 int n_members = MIN2(count, 2);
1148 for (int i = 0; i < n_members; ++i) {
1149 int member_index = Bytes::get_Java_u2((address)offset);
1150 offset += 2;
1151 member = check_symbol_at(cp, member_index);
1152 if (member == vmSymbols::since() &&
1153 (*((address)offset) == s_tag_val)) {
1154 // Found `since` first so skip over it
1155 offset += 3;
1156 }
1157 else if (member == vmSymbols::for_removal() &&
1158 (*((address)offset) == b_tag_val)) {
1159 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1160 // No guarantee the entry is valid so check it refers to an int in the CP.
1161 if (cp->is_within_bounds(boolean_value_index) &&
1162 cp->tag_at(boolean_value_index).is_int() &&
1163 cp->int_at(boolean_value_index) == 1) {
1164 // forRemoval == true
1165 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1166 }
1167 break; // no need to check further
1168 }
1169 else {
1170 // This @Deprecated annotation is malformed so we don't try to
1171 // determine whether forRemoval is set.
1172 break;
1173 }
1174 }
1175 continue; // proceed to next annotation
1176 }
1177
1178 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1179 // @Contended can optionally specify the contention group.
1180 //
1181 // Contended group defines the equivalence class over the fields:
1182 // the fields within the same contended group are not treated distinct.
1183 // The only exception is default group, which does not incur the
1184 // equivalence. Naturally, contention group for classes is meaningless.
1185 //
1186 // While the contention group is specified as String, annotation
1187 // values are already interned, and we might as well use the constant
1188 // pool index as the group tag.
1189 //
1190 u2 group_index = 0; // default contended group
1191 if (count == 1
1192 && s_size == (index - index0) // match size
1193 && s_tag_val == *(abase + tag_off)
1194 && member == vmSymbols::value_name()) {
1195 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1196 // No guarantee the group_index is valid so check it refers to a
1197 // symbol in the CP.
1198 if (cp->is_within_bounds(group_index) &&
1199 cp->tag_at(group_index).is_utf8()) {
1200 // Seems valid, so check for empty string and reset
1201 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1202 group_index = 0; // default contended group
1203 }
1204 } else {
1205 // Not valid so use the default
1206 group_index = 0;
1207 }
1208 }
1209 coll->set_contended_group(group_index);
1210 continue; // proceed to next annotation
1211 }
1212 }
1213 }
1214
1215
1216 // Parse attributes for a field.
1217 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1218 u2 attributes_count,
1219 bool is_static, u2 signature_index,
1220 u2* const constantvalue_index_addr,
1221 bool* const is_synthetic_addr,
1222 u2* const generic_signature_index_addr,
1223 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1224 TRAPS) {
1225 assert(cfs != nullptr, "invariant");
1226 assert(constantvalue_index_addr != nullptr, "invariant");
1227 assert(is_synthetic_addr != nullptr, "invariant");
1228 assert(generic_signature_index_addr != nullptr, "invariant");
1229 assert(parsed_annotations != nullptr, "invariant");
1230 assert(attributes_count > 0, "attributes_count should be greater than 0");
1231
1232 u2 constantvalue_index = 0;
1233 u2 generic_signature_index = 0;
1234 bool is_synthetic = false;
1235 const u1* runtime_visible_annotations = nullptr;
1236 int runtime_visible_annotations_length = 0;
1237 const u1* runtime_visible_type_annotations = nullptr;
1238 int runtime_visible_type_annotations_length = 0;
1239 bool runtime_invisible_annotations_exists = false;
1240 bool runtime_invisible_type_annotations_exists = false;
1241 const ConstantPool* const cp = _cp;
1242
1243 while (attributes_count--) {
1244 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1245 const u2 attribute_name_index = cfs->get_u2_fast();
1246 const u4 attribute_length = cfs->get_u4_fast();
1247 guarantee_property(valid_symbol_at(attribute_name_index),
1248 "Invalid field attribute index %u in class file %s",
1249 attribute_name_index,
1250 CHECK);
1251
1252 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1253 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1254 // ignore if non-static
1255 if (constantvalue_index != 0) {
1256 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1257 return;
1258 }
1259 guarantee_property(
1260 attribute_length == 2,
1261 "Invalid ConstantValue field attribute length %u in class file %s",
1262 attribute_length, CHECK);
1263
1264 constantvalue_index = cfs->get_u2(CHECK);
1265 if (_need_verify) {
1266 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1267 }
1268 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1269 if (attribute_length != 0) {
1270 classfile_parse_error(
1271 "Invalid Synthetic field attribute length %u in class file %s",
1272 attribute_length, THREAD);
1273 return;
1274 }
1275 is_synthetic = true;
1276 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1277 if (attribute_length != 0) {
1278 classfile_parse_error(
1279 "Invalid Deprecated field attribute length %u in class file %s",
1280 attribute_length, THREAD);
1281 return;
1282 }
1283 } else if (_major_version >= JAVA_1_5_VERSION) {
1284 if (attribute_name == vmSymbols::tag_signature()) {
1285 if (generic_signature_index != 0) {
1286 classfile_parse_error(
1287 "Multiple Signature attributes for field in class file %s", THREAD);
1288 return;
1289 }
1290 if (attribute_length != 2) {
1291 classfile_parse_error(
1292 "Wrong size %u for field's Signature attribute in class file %s",
1293 attribute_length, THREAD);
1294 return;
1295 }
1296 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1297 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1298 if (runtime_visible_annotations != nullptr) {
1299 classfile_parse_error(
1300 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1301 return;
1302 }
1303 runtime_visible_annotations_length = attribute_length;
1304 runtime_visible_annotations = cfs->current();
1305 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1306 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1307 parse_annotations(cp,
1308 runtime_visible_annotations,
1309 runtime_visible_annotations_length,
1310 parsed_annotations,
1311 _loader_data,
1312 _can_access_vm_annotations);
1313 cfs->skip_u1_fast(runtime_visible_annotations_length);
1314 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1315 if (runtime_invisible_annotations_exists) {
1316 classfile_parse_error(
1317 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1318 return;
1319 }
1320 runtime_invisible_annotations_exists = true;
1321 cfs->skip_u1(attribute_length, CHECK);
1322 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1323 if (runtime_visible_type_annotations != nullptr) {
1324 classfile_parse_error(
1325 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1326 return;
1327 }
1328 runtime_visible_type_annotations_length = attribute_length;
1329 runtime_visible_type_annotations = cfs->current();
1330 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1331 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1332 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1333 if (runtime_invisible_type_annotations_exists) {
1334 classfile_parse_error(
1335 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1336 return;
1337 } else {
1338 runtime_invisible_type_annotations_exists = true;
1339 }
1340 cfs->skip_u1(attribute_length, CHECK);
1341 } else {
1342 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1343 }
1344 } else {
1345 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1346 }
1347 }
1348
1349 *constantvalue_index_addr = constantvalue_index;
1350 *is_synthetic_addr = is_synthetic;
1351 *generic_signature_index_addr = generic_signature_index;
1352 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1353 runtime_visible_annotations_length,
1354 CHECK);
1355 parsed_annotations->set_field_annotations(a);
1356 a = allocate_annotations(runtime_visible_type_annotations,
1357 runtime_visible_type_annotations_length,
1358 CHECK);
1359 parsed_annotations->set_field_type_annotations(a);
1360 return;
1361 }
1362
1363
1364 // Side-effects: populates the _fields, _fields_annotations,
1365 // _fields_type_annotations fields
1366 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1367 AccessFlags class_access_flags,
1368 ConstantPool* cp,
1369 const int cp_size,
1370 u2* const java_fields_count_ptr,
1371 TRAPS) {
1372
1373 assert(cfs != nullptr, "invariant");
1374 assert(cp != nullptr, "invariant");
1375 assert(java_fields_count_ptr != nullptr, "invariant");
1376
1377 assert(nullptr == _fields_annotations, "invariant");
1378 assert(nullptr == _fields_type_annotations, "invariant");
1379
1380 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1381 cfs->guarantee_more(2, CHECK); // length
1382 const u2 length = cfs->get_u2_fast();
1383 *java_fields_count_ptr = length;
1384
1385 int num_injected = 0;
1386 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1387 &num_injected);
1388
1389 // two more slots are required for inline classes:
1390 // one for the static field with a reference to the pre-allocated default value
1391 // one for the field the JVM injects when detecting an empty inline class
1392 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1393
1394 // Allocate a temporary resource array to collect field data.
1395 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1396 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1397
1398 int instance_fields_count = 0;
1399 ResourceMark rm(THREAD);
1400 for (int n = 0; n < length; n++) {
1401 // access_flags, name_index, descriptor_index, attributes_count
1402 cfs->guarantee_more(8, CHECK);
1403
1404 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1405 if (!supports_inline_types()) {
1406 recognized_modifiers &= ~JVM_ACC_STRICT;
1407 }
1408
1409 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1410 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1411 AccessFlags access_flags;
1412 access_flags.set_flags(flags);
1413 FieldInfo::FieldFlags fieldFlags(0);
1414
1415 const u2 name_index = cfs->get_u2_fast();
1416 guarantee_property(valid_symbol_at(name_index),
1417 "Invalid constant pool index %u for field name in class file %s",
1418 name_index, CHECK);
1419 const Symbol* const name = cp->symbol_at(name_index);
1420 verify_legal_field_name(name, CHECK);
1421
1422 const u2 signature_index = cfs->get_u2_fast();
1423 guarantee_property(valid_symbol_at(signature_index),
1424 "Invalid constant pool index %u for field signature in class file %s",
1425 signature_index, CHECK);
1426 const Symbol* const sig = cp->symbol_at(signature_index);
1427 verify_legal_field_signature(name, sig, CHECK);
1428 if (!access_flags.is_static()) instance_fields_count++;
1429
1430 u2 constantvalue_index = 0;
1431 bool is_synthetic = false;
1432 u2 generic_signature_index = 0;
1433 const bool is_static = access_flags.is_static();
1434 FieldAnnotationCollector parsed_annotations(_loader_data);
1435
1436 bool is_null_restricted = false;
1437
1438 const u2 attributes_count = cfs->get_u2_fast();
1439 if (attributes_count > 0) {
1440 parse_field_attributes(cfs,
1441 attributes_count,
1442 is_static,
1443 signature_index,
1444 &constantvalue_index,
1445 &is_synthetic,
1446 &generic_signature_index,
1447 &parsed_annotations,
1448 CHECK);
1449
1450 if (parsed_annotations.field_annotations() != nullptr) {
1451 if (_fields_annotations == nullptr) {
1452 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1453 _loader_data, length, nullptr,
1454 CHECK);
1455 }
1456 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1457 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1458 if (!Signature::has_envelope(sig)) {
1459 Exceptions::fthrow(
1460 THREAD_AND_LOCATION,
1461 vmSymbols::java_lang_ClassFormatError(),
1462 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1463 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1464 }
1465 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
1466 if (!is_strict) {
1467 Exceptions::fthrow(
1468 THREAD_AND_LOCATION,
1469 vmSymbols::java_lang_ClassFormatError(),
1470 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s which doesn't have the @jdk.internal.vm.annotation.Strict annotation",
1471 class_name()->as_C_string(), name->as_C_string());
1472 }
1473 is_null_restricted = true;
1474 }
1475 parsed_annotations.set_field_annotations(nullptr);
1476 }
1477 if (parsed_annotations.field_type_annotations() != nullptr) {
1478 if (_fields_type_annotations == nullptr) {
1479 _fields_type_annotations =
1480 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1481 length,
1482 nullptr,
1483 CHECK);
1484 }
1485 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1486 parsed_annotations.set_field_type_annotations(nullptr);
1487 }
1488
1489 if (is_synthetic) {
1490 access_flags.set_is_synthetic();
1491 }
1492 if (generic_signature_index != 0) {
1493 fieldFlags.update_generic(true);
1494 }
1495 }
1496
1497 if (is_null_restricted) {
1498 fieldFlags.update_null_free_inline_type(true);
1499 }
1500
1501 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1502
1503 // Update number of static oop fields.
1504 if (is_static && is_reference_type(type)) {
1505 _static_oop_count++;
1506 }
1507
1508 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1509 fi.set_index(n);
1510 if (fieldFlags.is_generic()) {
1511 fi.set_generic_signature_index(generic_signature_index);
1512 }
1513 parsed_annotations.apply_to(&fi);
1514 if (fi.field_flags().is_contended()) {
1515 _has_contended_fields = true;
1516 }
1517 if (access_flags.is_strict() && access_flags.is_static()) {
1518 _has_strict_static_fields = true;
1519 }
1520 _temp_field_info->append(fi);
1521 }
1522 assert(_temp_field_info->length() == length, "Must be");
1523
1524 if (num_injected != 0) {
1525 for (int n = 0; n < num_injected; n++) {
1526 // Check for duplicates
1527 if (injected[n].may_be_java) {
1528 const Symbol* const name = injected[n].name();
1529 const Symbol* const signature = injected[n].signature();
1530 bool duplicate = false;
1531 for (int i = 0; i < length; i++) {
1532 const FieldInfo* const f = _temp_field_info->adr_at(i);
1533 if (name == cp->symbol_at(f->name_index()) &&
1534 signature == cp->symbol_at(f->signature_index())) {
1535 // Symbol is desclared in Java so skip this one
1536 duplicate = true;
1537 break;
1538 }
1539 }
1540 if (duplicate) {
1541 // These will be removed from the field array at the end
1542 continue;
1543 }
1544 }
1545
1546 // Injected field
1547 FieldInfo::FieldFlags fflags(0);
1548 fflags.update_injected(true);
1549 AccessFlags aflags;
1550 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1551 int idx = _temp_field_info->append(fi);
1552 _temp_field_info->adr_at(idx)->set_index(idx);
1553 }
1554 }
1555
1556 if (is_inline_type) {
1557 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1558 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1559 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1560 // alive.
1561 FieldInfo::FieldFlags fflags2(0);
1562 fflags2.update_injected(true);
1563 AccessFlags aflags2(JVM_ACC_STATIC);
1564 FieldInfo fi2(aflags2,
1565 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1566 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1567 0,
1568 fflags2);
1569 int idx2 = _temp_field_info->append(fi2);
1570 _temp_field_info->adr_at(idx2)->set_index(idx2);
1571 _static_oop_count++;
1572 }
1573
1574 if (_need_verify && length > 1) {
1575 // Check duplicated fields
1576 ResourceMark rm(THREAD);
1577 // Set containing name-signature pairs
1578 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1579 for (int i = 0; i < _temp_field_info->length(); i++) {
1580 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1581 _temp_field_info->adr_at(i)->signature(_cp));
1582 // If no duplicates, add name/signature in hashtable names_and_sigs.
1583 if(!names_and_sigs->put(name_and_sig, 0)) {
1584 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1585 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1586 return;
1587 }
1588 }
1589 }
1590 }
1591
1592
1593 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1594 u4 code_length,
1595 u4 exception_table_length,
1596 TRAPS) {
1597 assert(cfs != nullptr, "invariant");
1598
1599 const unsafe_u2* const exception_table_start = cfs->current();
1600 assert(exception_table_start != nullptr, "null exception table");
1601
1602 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1603 // end_pc,
1604 // handler_pc,
1605 // catch_type_index
1606
1607 // Will check legal target after parsing code array in verifier.
1608 if (_need_verify) {
1609 for (unsigned int i = 0; i < exception_table_length; i++) {
1610 const u2 start_pc = cfs->get_u2_fast();
1611 const u2 end_pc = cfs->get_u2_fast();
1612 const u2 handler_pc = cfs->get_u2_fast();
1613 const u2 catch_type_index = cfs->get_u2_fast();
1614 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1615 "Illegal exception table range in class file %s",
1616 CHECK_NULL);
1617 guarantee_property(handler_pc < code_length,
1618 "Illegal exception table handler in class file %s",
1619 CHECK_NULL);
1620 if (catch_type_index != 0) {
1621 guarantee_property(valid_klass_reference_at(catch_type_index),
1622 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1623 }
1624 }
1625 } else {
1626 cfs->skip_u2_fast(exception_table_length * 4);
1627 }
1628 return exception_table_start;
1629 }
1630
1631 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1632 u4 code_length,
1633 CompressedLineNumberWriteStream**const write_stream,
1634 TRAPS) {
1635
1636 const ClassFileStream* const cfs = _stream;
1637 unsigned int num_entries = cfs->get_u2(CHECK);
1638
1639 // Each entry is a u2 start_pc, and a u2 line_number
1640 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1641
1642 // Verify line number attribute and table length
1643 guarantee_property(
1644 code_attribute_length == sizeof(u2) + length_in_bytes,
1645 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1646
1647 cfs->guarantee_more(length_in_bytes, CHECK);
1648
1649 if ((*write_stream) == nullptr) {
1650 if (length_in_bytes > fixed_buffer_size) {
1651 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1652 } else {
1653 (*write_stream) = new CompressedLineNumberWriteStream(
1654 _linenumbertable_buffer, fixed_buffer_size);
1655 }
1656 }
1657
1658 while (num_entries-- > 0) {
1659 const u2 bci = cfs->get_u2_fast(); // start_pc
1660 const u2 line = cfs->get_u2_fast(); // line_number
1661 guarantee_property(bci < code_length,
1662 "Invalid pc in LineNumberTable in class file %s", CHECK);
1663 (*write_stream)->write_pair(bci, line);
1664 }
1665 }
1666
1667
1668 class LVT_Hash : public AllStatic {
1669 public:
1670
1671 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1672 /*
1673 * 3-tuple start_bci/length/slot has to be unique key,
1674 * so the following comparison seems to be redundant:
1675 * && elem->name_cp_index == entry->_elem->name_cp_index
1676 */
1677 return (e0.start_bci == e1.start_bci &&
1678 e0.length == e1.length &&
1679 e0.name_cp_index == e1.name_cp_index &&
1680 e0.slot == e1.slot);
1681 }
1682
1683 static unsigned int hash(LocalVariableTableElement const& e0) {
1684 unsigned int raw_hash = e0.start_bci;
1685
1686 raw_hash = e0.length + raw_hash * 37;
1687 raw_hash = e0.name_cp_index + raw_hash * 37;
1688 raw_hash = e0.slot + raw_hash * 37;
1689
1690 return raw_hash;
1691 }
1692 };
1693
1694
1695 // Class file LocalVariableTable elements.
1696 class Classfile_LVT_Element {
1697 public:
1698 u2 start_bci;
1699 u2 length;
1700 u2 name_cp_index;
1701 u2 descriptor_cp_index;
1702 u2 slot;
1703 };
1704
1705 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1706 LocalVariableTableElement* const lvt) {
1707 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1708 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1709 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1710 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1711 lvt->signature_cp_index = 0;
1712 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1713 }
1714
1715 // Function is used to parse both attributes:
1716 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1717 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1718 u4 code_length,
1719 u2 max_locals,
1720 u4 code_attribute_length,
1721 u2* const localvariable_table_length,
1722 bool isLVTT,
1723 TRAPS) {
1724 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1725 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1726 const unsigned int size = checked_cast<unsigned>(
1727 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1728
1729 const ConstantPool* const cp = _cp;
1730
1731 // Verify local variable table attribute has right length
1732 if (_need_verify) {
1733 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1734 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1735 }
1736
1737 const unsafe_u2* const localvariable_table_start = cfs->current();
1738 assert(localvariable_table_start != nullptr, "null local variable table");
1739 if (!_need_verify) {
1740 cfs->skip_u2_fast(size);
1741 } else {
1742 cfs->guarantee_more(size * 2, CHECK_NULL);
1743 for(int i = 0; i < (*localvariable_table_length); i++) {
1744 const u2 start_pc = cfs->get_u2_fast();
1745 const u2 length = cfs->get_u2_fast();
1746 const u2 name_index = cfs->get_u2_fast();
1747 const u2 descriptor_index = cfs->get_u2_fast();
1748 const u2 index = cfs->get_u2_fast();
1749 // Assign to a u4 to avoid overflow
1750 const u4 end_pc = (u4)start_pc + (u4)length;
1751
1752 if (start_pc >= code_length) {
1753 classfile_parse_error(
1754 "Invalid start_pc %u in %s in class file %s",
1755 start_pc, tbl_name, THREAD);
1756 return nullptr;
1757 }
1758 if (end_pc > code_length) {
1759 classfile_parse_error(
1760 "Invalid length %u in %s in class file %s",
1761 length, tbl_name, THREAD);
1762 return nullptr;
1763 }
1764 const int cp_size = cp->length();
1765 guarantee_property(valid_symbol_at(name_index),
1766 "Name index %u in %s has bad constant type in class file %s",
1767 name_index, tbl_name, CHECK_NULL);
1768 guarantee_property(valid_symbol_at(descriptor_index),
1769 "Signature index %u in %s has bad constant type in class file %s",
1770 descriptor_index, tbl_name, CHECK_NULL);
1771
1772 const Symbol* const name = cp->symbol_at(name_index);
1773 const Symbol* const sig = cp->symbol_at(descriptor_index);
1774 verify_legal_field_name(name, CHECK_NULL);
1775 u2 extra_slot = 0;
1776 if (!isLVTT) {
1777 verify_legal_field_signature(name, sig, CHECK_NULL);
1778
1779 // 4894874: check special cases for double and long local variables
1780 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1781 sig == vmSymbols::type_signature(T_LONG)) {
1782 extra_slot = 1;
1783 }
1784 }
1785 guarantee_property((index + extra_slot) < max_locals,
1786 "Invalid index %u in %s in class file %s",
1787 index, tbl_name, CHECK_NULL);
1788 }
1789 }
1790 return localvariable_table_start;
1791 }
1792
1793 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1794 u4 code_attribute_length,
1795 TRAPS) {
1796 assert(cfs != nullptr, "invariant");
1797
1798 if (0 == code_attribute_length) {
1799 return nullptr;
1800 }
1801
1802 const u1* const stackmap_table_start = cfs->current();
1803 assert(stackmap_table_start != nullptr, "null stackmap table");
1804
1805 // check code_attribute_length
1806 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1807
1808 return stackmap_table_start;
1809 }
1810
1811 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1812 u2* const checked_exceptions_length,
1813 u4 method_attribute_length,
1814 TRAPS) {
1815 assert(cfs != nullptr, "invariant");
1816 assert(checked_exceptions_length != nullptr, "invariant");
1817
1818 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1819 *checked_exceptions_length = cfs->get_u2_fast();
1820 const unsigned int size =
1821 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1822 const unsafe_u2* const checked_exceptions_start = cfs->current();
1823 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1824 if (!_need_verify) {
1825 cfs->skip_u2_fast(size);
1826 } else {
1827 // Verify each value in the checked exception table
1828 u2 checked_exception;
1829 const u2 len = *checked_exceptions_length;
1830 cfs->guarantee_more(2 * len, CHECK_NULL);
1831 for (int i = 0; i < len; i++) {
1832 checked_exception = cfs->get_u2_fast();
1833 guarantee_property(
1834 valid_klass_reference_at(checked_exception),
1835 "Exception name has bad type at constant pool %u in class file %s",
1836 checked_exception, CHECK_NULL);
1837 }
1838 }
1839 // check exceptions attribute length
1840 if (_need_verify) {
1841 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1842 sizeof(u2) * size),
1843 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1844 }
1845 return checked_exceptions_start;
1846 }
1847
1848 void ClassFileParser::throwIllegalSignature(const char* type,
1849 const Symbol* name,
1850 const Symbol* sig,
1851 TRAPS) const {
1852 assert(name != nullptr, "invariant");
1853 assert(sig != nullptr, "invariant");
1854
1855 ResourceMark rm(THREAD);
1856 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1857 Exceptions::fthrow(THREAD_AND_LOCATION,
1858 vmSymbols::java_lang_ClassFormatError(),
1859 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1860 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1861 }
1862
1863 AnnotationCollector::ID
1864 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1865 const Symbol* name,
1866 const bool can_access_vm_annotations) {
1867 const vmSymbolID sid = vmSymbols::find_sid(name);
1868 // Privileged code can use all annotations. Other code silently drops some.
1869 const bool privileged = loader_data->is_boot_class_loader_data() ||
1870 loader_data->is_platform_class_loader_data() ||
1871 can_access_vm_annotations;
1872 switch (sid) {
1873 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1874 if (_location != _in_method) break; // only allow for methods
1875 if (!privileged) break; // only allow in privileged code
1876 return _method_CallerSensitive;
1877 }
1878 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1879 if (_location != _in_method) break; // only allow for methods
1880 if (!privileged) break; // only allow in privileged code
1881 return _method_ForceInline;
1882 }
1883 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1884 if (_location != _in_method) break; // only allow for methods
1885 if (!privileged) break; // only allow in privileged code
1886 return _method_DontInline;
1887 }
1888 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1889 if (_location != _in_method) break; // only allow for methods
1890 if (!privileged) break; // only allow in privileged code
1891 return _method_ChangesCurrentThread;
1892 }
1893 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1894 if (_location != _in_method) break; // only allow for methods
1895 if (!privileged) break; // only allow in privileged code
1896 return _method_JvmtiHideEvents;
1897 }
1898 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1899 if (_location != _in_method) break; // only allow for methods
1900 if (!privileged) break; // only allow in privileged code
1901 return _method_JvmtiMountTransition;
1902 }
1903 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1904 if (_location != _in_method) break; // only allow for methods
1905 if (!privileged) break; // only allow in privileged code
1906 return _method_InjectedProfile;
1907 }
1908 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1909 if (_location != _in_method) break; // only allow for methods
1910 if (!privileged) break; // only allow in privileged code
1911 return _method_LambdaForm_Compiled;
1912 }
1913 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1914 if (_location != _in_method) break; // only allow for methods
1915 if (!privileged) break; // only allow in privileged code
1916 return _method_Hidden;
1917 }
1918 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1919 if (_location != _in_method) break; // only allow for methods
1920 if (!privileged) break; // only allow in privileged code
1921 return _method_Scoped;
1922 }
1923 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1924 if (_location != _in_method) break; // only allow for methods
1925 if (!privileged) break; // only allow in privileged code
1926 return _method_IntrinsicCandidate;
1927 }
1928 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1929 if (_location != _in_field) break; // only allow for fields
1930 if (!privileged) break; // only allow in privileged code
1931 return _field_Stable;
1932 }
1933 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1934 if (_location != _in_field && _location != _in_class) {
1935 break; // only allow for fields and classes
1936 }
1937 if (!EnableContended || (RestrictContended && !privileged)) {
1938 break; // honor privileges
1939 }
1940 return _jdk_internal_vm_annotation_Contended;
1941 }
1942 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1943 if (_location != _in_method) break; // only allow for methods
1944 if (RestrictReservedStack && !privileged) break; // honor privileges
1945 return _jdk_internal_vm_annotation_ReservedStackAccess;
1946 }
1947 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1948 if (_location != _in_class) break; // only allow for classes
1949 if (!privileged) break; // only allow in privileged code
1950 return _jdk_internal_ValueBased;
1951 }
1952 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1953 if (_location != _in_class) break; // only allow for classes
1954 return _jdk_internal_LooselyConsistentValue;
1955 }
1956 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1957 if (_location != _in_field) break; // only allow for fields
1958 return _jdk_internal_NullRestricted;
1959 }
1960 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1961 return _java_lang_Deprecated;
1962 }
1963 default: {
1964 break;
1965 }
1966 }
1967 return AnnotationCollector::_unknown;
1968 }
1969
1970 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1971 if (is_contended())
1972 // Setting the contended group also sets the contended bit in field flags
1973 f->set_contended_group(contended_group());
1974 if (is_stable())
1975 (f->field_flags_addr())->update_stable(true);
1976 }
1977
1978 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1979 // If there's an error deallocate metadata for field annotations
1980 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1981 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1982 }
1983
1984 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1985 if (has_annotation(_method_CallerSensitive))
1986 m->set_caller_sensitive();
1987 if (has_annotation(_method_ForceInline))
1988 m->set_force_inline();
1989 if (has_annotation(_method_DontInline))
1990 m->set_dont_inline();
1991 if (has_annotation(_method_ChangesCurrentThread))
1992 m->set_changes_current_thread();
1993 if (has_annotation(_method_JvmtiHideEvents))
1994 m->set_jvmti_hide_events();
1995 if (has_annotation(_method_JvmtiMountTransition))
1996 m->set_jvmti_mount_transition();
1997 if (has_annotation(_method_InjectedProfile))
1998 m->set_has_injected_profile();
1999 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2000 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2001 if (has_annotation(_method_Hidden))
2002 m->set_is_hidden();
2003 if (has_annotation(_method_Scoped))
2004 m->set_scoped();
2005 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2006 m->set_intrinsic_candidate();
2007 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2008 m->set_has_reserved_stack_access();
2009 if (has_annotation(_java_lang_Deprecated))
2010 m->set_deprecated();
2011 if (has_annotation(_java_lang_Deprecated_for_removal))
2012 m->set_deprecated_for_removal();
2013 }
2014
2015 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2016 assert(ik != nullptr, "invariant");
2017 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2018 ik->set_is_contended(is_contended());
2019 }
2020 if (has_annotation(_jdk_internal_ValueBased)) {
2021 ik->set_has_value_based_class_annotation();
2022 if (DiagnoseSyncOnValueBasedClasses) {
2023 ik->set_is_value_based();
2024 }
2025 }
2026 if (has_annotation(_java_lang_Deprecated)) {
2027 Array<Method*>* methods = ik->methods();
2028 int length = ik->methods()->length();
2029 for (int i = 0; i < length; i++) {
2030 Method* m = methods->at(i);
2031 m->set_deprecated();
2032 }
2033 }
2034 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2035 Array<Method*>* methods = ik->methods();
2036 int length = ik->methods()->length();
2037 for (int i = 0; i < length; i++) {
2038 Method* m = methods->at(i);
2039 m->set_deprecated_for_removal();
2040 }
2041 }
2042 }
2043
2044 #define MAX_ARGS_SIZE 255
2045 #define MAX_CODE_SIZE 65535
2046 #define INITIAL_MAX_LVT_NUMBER 256
2047
2048 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2049 *
2050 * Rules for LVT's and LVTT's are:
2051 * - There can be any number of LVT's and LVTT's.
2052 * - If there are n LVT's, it is the same as if there was just
2053 * one LVT containing all the entries from the n LVT's.
2054 * - There may be no more than one LVT entry per local variable.
2055 * Two LVT entries are 'equal' if these fields are the same:
2056 * start_pc, length, name, slot
2057 * - There may be no more than one LVTT entry per each LVT entry.
2058 * Each LVTT entry has to match some LVT entry.
2059 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2060 */
2061 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2062 int lvt_cnt,
2063 u2* const localvariable_table_length,
2064 const unsafe_u2** const localvariable_table_start,
2065 int lvtt_cnt,
2066 u2* const localvariable_type_table_length,
2067 const unsafe_u2** const localvariable_type_table_start,
2068 TRAPS) {
2069
2070 ResourceMark rm(THREAD);
2071
2072 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2073 256, AnyObj::RESOURCE_AREA, mtInternal,
2074 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2075
2076 LVT_HashTable* const table = new LVT_HashTable();
2077
2078 // To fill LocalVariableTable in
2079 const Classfile_LVT_Element* cf_lvt;
2080 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2081
2082 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2083 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2084 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2085 copy_lvt_element(&cf_lvt[idx], lvt);
2086 // If no duplicates, add LVT elem in hashtable.
2087 if (table->put(*lvt, lvt) == false
2088 && _need_verify
2089 && _major_version >= JAVA_1_5_VERSION) {
2090 classfile_parse_error("Duplicated LocalVariableTable attribute "
2091 "entry for '%s' in class file %s",
2092 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2093 THREAD);
2094 return;
2095 }
2096 }
2097 }
2098
2099 // To merge LocalVariableTable and LocalVariableTypeTable
2100 const Classfile_LVT_Element* cf_lvtt;
2101 LocalVariableTableElement lvtt_elem;
2102
2103 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2104 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2105 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2106 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2107 LocalVariableTableElement** entry = table->get(lvtt_elem);
2108 if (entry == nullptr) {
2109 if (_need_verify) {
2110 classfile_parse_error("LVTT entry for '%s' in class file %s "
2111 "does not match any LVT entry",
2112 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2113 THREAD);
2114 return;
2115 }
2116 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2117 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2118 "entry for '%s' in class file %s",
2119 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2120 THREAD);
2121 return;
2122 } else {
2123 // to add generic signatures into LocalVariableTable
2124 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2125 }
2126 }
2127 }
2128 }
2129
2130
2131 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2132 const u1* runtime_visible_annotations,
2133 int runtime_visible_annotations_length,
2134 const u1* runtime_visible_parameter_annotations,
2135 int runtime_visible_parameter_annotations_length,
2136 const u1* runtime_visible_type_annotations,
2137 int runtime_visible_type_annotations_length,
2138 const u1* annotation_default,
2139 int annotation_default_length,
2140 TRAPS) {
2141
2142 AnnotationArray* a;
2143
2144 if (runtime_visible_annotations_length > 0) {
2145 a = allocate_annotations(runtime_visible_annotations,
2146 runtime_visible_annotations_length,
2147 CHECK);
2148 cm->set_method_annotations(a);
2149 }
2150
2151 if (runtime_visible_parameter_annotations_length > 0) {
2152 a = allocate_annotations(runtime_visible_parameter_annotations,
2153 runtime_visible_parameter_annotations_length,
2154 CHECK);
2155 cm->set_parameter_annotations(a);
2156 }
2157
2158 if (annotation_default_length > 0) {
2159 a = allocate_annotations(annotation_default,
2160 annotation_default_length,
2161 CHECK);
2162 cm->set_default_annotations(a);
2163 }
2164
2165 if (runtime_visible_type_annotations_length > 0) {
2166 a = allocate_annotations(runtime_visible_type_annotations,
2167 runtime_visible_type_annotations_length,
2168 CHECK);
2169 cm->set_type_annotations(a);
2170 }
2171 }
2172
2173
2174 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2175 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2176 // Method* to save footprint, so we only know the size of the resulting Method* when the
2177 // entire method attribute is parsed.
2178 //
2179 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2180
2181 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2182 bool is_interface,
2183 bool is_value_class,
2184 bool is_abstract_class,
2185 const ConstantPool* cp,
2186 bool* const has_localvariable_table,
2187 TRAPS) {
2188 assert(cfs != nullptr, "invariant");
2189 assert(cp != nullptr, "invariant");
2190 assert(has_localvariable_table != nullptr, "invariant");
2191
2192 ResourceMark rm(THREAD);
2193 // Parse fixed parts:
2194 // access_flags, name_index, descriptor_index, attributes_count
2195 cfs->guarantee_more(8, CHECK_NULL);
2196
2197 u2 flags = cfs->get_u2_fast();
2198 const u2 name_index = cfs->get_u2_fast();
2199 const int cp_size = cp->length();
2200 guarantee_property(
2201 valid_symbol_at(name_index),
2202 "Illegal constant pool index %u for method name in class file %s",
2203 name_index, CHECK_NULL);
2204 const Symbol* const name = cp->symbol_at(name_index);
2205 verify_legal_method_name(name, CHECK_NULL);
2206
2207 const u2 signature_index = cfs->get_u2_fast();
2208 guarantee_property(
2209 valid_symbol_at(signature_index),
2210 "Illegal constant pool index %u for method signature in class file %s",
2211 signature_index, CHECK_NULL);
2212 const Symbol* const signature = cp->symbol_at(signature_index);
2213
2214 if (name == vmSymbols::class_initializer_name()) {
2215 // We ignore the other access flags for a valid class initializer.
2216 // (JVM Spec 2nd ed., chapter 4.6)
2217 if (_major_version < 51) { // backward compatibility
2218 flags = JVM_ACC_STATIC;
2219 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2220 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2221 } else {
2222 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2223 return nullptr;
2224 }
2225 } else {
2226 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2227 }
2228
2229 if (name == vmSymbols::object_initializer_name() && is_interface) {
2230 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2231 return nullptr;
2232 }
2233
2234 if (EnableValhalla) {
2235 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2236 && ((flags & JVM_ACC_STATIC) == 0 )
2237 && !_access_flags.is_identity_class()) {
2238 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2239 return nullptr;
2240 }
2241 }
2242
2243 int args_size = -1; // only used when _need_verify is true
2244 if (_need_verify) {
2245 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2246 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2247 verify_legal_method_signature(name, signature, CHECK_NULL);
2248 if (args_size > MAX_ARGS_SIZE) {
2249 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2250 return nullptr;
2251 }
2252 }
2253
2254 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2255
2256 // Default values for code and exceptions attribute elements
2257 u2 max_stack = 0;
2258 u2 max_locals = 0;
2259 u4 code_length = 0;
2260 const u1* code_start = nullptr;
2261 u2 exception_table_length = 0;
2262 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2263 Array<int>* exception_handlers = Universe::the_empty_int_array();
2264 u2 checked_exceptions_length = 0;
2265 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2266 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2267 int linenumber_table_length = 0;
2268 int total_lvt_length = 0;
2269 u2 lvt_cnt = 0;
2270 u2 lvtt_cnt = 0;
2271 bool lvt_allocated = false;
2272 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2273 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2274 u2* localvariable_table_length = nullptr;
2275 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2276 u2* localvariable_type_table_length = nullptr;
2277 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2278 int method_parameters_length = -1;
2279 const u1* method_parameters_data = nullptr;
2280 bool method_parameters_seen = false;
2281 bool parsed_code_attribute = false;
2282 bool parsed_checked_exceptions_attribute = false;
2283 bool parsed_stackmap_attribute = false;
2284 // stackmap attribute - JDK1.5
2285 const u1* stackmap_data = nullptr;
2286 int stackmap_data_length = 0;
2287 u2 generic_signature_index = 0;
2288 MethodAnnotationCollector parsed_annotations;
2289 const u1* runtime_visible_annotations = nullptr;
2290 int runtime_visible_annotations_length = 0;
2291 const u1* runtime_visible_parameter_annotations = nullptr;
2292 int runtime_visible_parameter_annotations_length = 0;
2293 const u1* runtime_visible_type_annotations = nullptr;
2294 int runtime_visible_type_annotations_length = 0;
2295 bool runtime_invisible_annotations_exists = false;
2296 bool runtime_invisible_type_annotations_exists = false;
2297 bool runtime_invisible_parameter_annotations_exists = false;
2298 const u1* annotation_default = nullptr;
2299 int annotation_default_length = 0;
2300
2301 // Parse code and exceptions attribute
2302 u2 method_attributes_count = cfs->get_u2_fast();
2303 while (method_attributes_count--) {
2304 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2305 const u2 method_attribute_name_index = cfs->get_u2_fast();
2306 const u4 method_attribute_length = cfs->get_u4_fast();
2307 guarantee_property(
2308 valid_symbol_at(method_attribute_name_index),
2309 "Invalid method attribute name index %u in class file %s",
2310 method_attribute_name_index, CHECK_NULL);
2311
2312 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2313 if (method_attribute_name == vmSymbols::tag_code()) {
2314 // Parse Code attribute
2315 if (_need_verify) {
2316 guarantee_property(
2317 !access_flags.is_native() && !access_flags.is_abstract(),
2318 "Code attribute in native or abstract methods in class file %s",
2319 CHECK_NULL);
2320 }
2321 if (parsed_code_attribute) {
2322 classfile_parse_error("Multiple Code attributes in class file %s",
2323 THREAD);
2324 return nullptr;
2325 }
2326 parsed_code_attribute = true;
2327
2328 // Stack size, locals size, and code size
2329 cfs->guarantee_more(8, CHECK_NULL);
2330 max_stack = cfs->get_u2_fast();
2331 max_locals = cfs->get_u2_fast();
2332 code_length = cfs->get_u4_fast();
2333 if (_need_verify) {
2334 guarantee_property(args_size <= max_locals,
2335 "Arguments can't fit into locals in class file %s",
2336 CHECK_NULL);
2337 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2338 "Invalid method Code length %u in class file %s",
2339 code_length, CHECK_NULL);
2340 }
2341 // Code pointer
2342 code_start = cfs->current();
2343 assert(code_start != nullptr, "null code start");
2344 cfs->guarantee_more(code_length, CHECK_NULL);
2345 cfs->skip_u1_fast(code_length);
2346
2347 // Exception handler table
2348 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2349 exception_table_length = cfs->get_u2_fast();
2350 if (exception_table_length > 0) {
2351 exception_table_start = parse_exception_table(cfs,
2352 code_length,
2353 exception_table_length,
2354 CHECK_NULL);
2355 }
2356
2357 // Parse additional attributes in code attribute
2358 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2359 u2 code_attributes_count = cfs->get_u2_fast();
2360
2361 unsigned int calculated_attribute_length = 0;
2362
2363 calculated_attribute_length =
2364 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2365 calculated_attribute_length += checked_cast<unsigned int>(
2366 code_length +
2367 sizeof(exception_table_length) +
2368 sizeof(code_attributes_count) +
2369 exception_table_length *
2370 ( sizeof(u2) + // start_pc
2371 sizeof(u2) + // end_pc
2372 sizeof(u2) + // handler_pc
2373 sizeof(u2) )); // catch_type_index
2374
2375 while (code_attributes_count--) {
2376 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2377 const u2 code_attribute_name_index = cfs->get_u2_fast();
2378 const u4 code_attribute_length = cfs->get_u4_fast();
2379 calculated_attribute_length += code_attribute_length +
2380 (unsigned)sizeof(code_attribute_name_index) +
2381 (unsigned)sizeof(code_attribute_length);
2382 guarantee_property(valid_symbol_at(code_attribute_name_index),
2383 "Invalid code attribute name index %u in class file %s",
2384 code_attribute_name_index,
2385 CHECK_NULL);
2386 if (LoadLineNumberTables &&
2387 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2388 // Parse and compress line number table
2389 parse_linenumber_table(code_attribute_length,
2390 code_length,
2391 &linenumber_table,
2392 CHECK_NULL);
2393
2394 } else if (LoadLocalVariableTables &&
2395 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2396 // Parse local variable table
2397 if (!lvt_allocated) {
2398 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2399 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2400 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2401 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2402 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2403 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2404 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2405 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2406 lvt_allocated = true;
2407 }
2408 if (lvt_cnt == max_lvt_cnt) {
2409 max_lvt_cnt <<= 1;
2410 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2411 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2412 }
2413 localvariable_table_start[lvt_cnt] =
2414 parse_localvariable_table(cfs,
2415 code_length,
2416 max_locals,
2417 code_attribute_length,
2418 &localvariable_table_length[lvt_cnt],
2419 false, // is not LVTT
2420 CHECK_NULL);
2421 total_lvt_length += localvariable_table_length[lvt_cnt];
2422 lvt_cnt++;
2423 } else if (LoadLocalVariableTypeTables &&
2424 _major_version >= JAVA_1_5_VERSION &&
2425 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2426 if (!lvt_allocated) {
2427 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2428 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2429 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2430 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2431 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2432 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2433 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2434 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2435 lvt_allocated = true;
2436 }
2437 // Parse local variable type table
2438 if (lvtt_cnt == max_lvtt_cnt) {
2439 max_lvtt_cnt <<= 1;
2440 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2441 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2442 }
2443 localvariable_type_table_start[lvtt_cnt] =
2444 parse_localvariable_table(cfs,
2445 code_length,
2446 max_locals,
2447 code_attribute_length,
2448 &localvariable_type_table_length[lvtt_cnt],
2449 true, // is LVTT
2450 CHECK_NULL);
2451 lvtt_cnt++;
2452 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2453 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2454 // Stack map is only needed by the new verifier in JDK1.5.
2455 if (parsed_stackmap_attribute) {
2456 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2457 return nullptr;
2458 }
2459 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2460 stackmap_data_length = code_attribute_length;
2461 parsed_stackmap_attribute = true;
2462 } else {
2463 // Skip unknown attributes
2464 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2465 }
2466 }
2467 // check method attribute length
2468 if (_need_verify) {
2469 guarantee_property(method_attribute_length == calculated_attribute_length,
2470 "Code segment has wrong length in class file %s",
2471 CHECK_NULL);
2472 }
2473 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2474 // Parse Exceptions attribute
2475 if (parsed_checked_exceptions_attribute) {
2476 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2477 THREAD);
2478 return nullptr;
2479 }
2480 parsed_checked_exceptions_attribute = true;
2481 checked_exceptions_start =
2482 parse_checked_exceptions(cfs,
2483 &checked_exceptions_length,
2484 method_attribute_length,
2485 CHECK_NULL);
2486 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2487 // reject multiple method parameters
2488 if (method_parameters_seen) {
2489 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2490 THREAD);
2491 return nullptr;
2492 }
2493 method_parameters_seen = true;
2494 method_parameters_length = cfs->get_u1_fast();
2495 const u4 real_length = (method_parameters_length * 4u) + 1u;
2496 if (method_attribute_length != real_length) {
2497 classfile_parse_error(
2498 "Invalid MethodParameters method attribute length %u in class file",
2499 method_attribute_length, THREAD);
2500 return nullptr;
2501 }
2502 method_parameters_data = cfs->current();
2503 cfs->skip_u2_fast(method_parameters_length);
2504 cfs->skip_u2_fast(method_parameters_length);
2505 // ignore this attribute if it cannot be reflected
2506 if (!vmClasses::Parameter_klass_loaded())
2507 method_parameters_length = -1;
2508 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2509 if (method_attribute_length != 0) {
2510 classfile_parse_error(
2511 "Invalid Synthetic method attribute length %u in class file %s",
2512 method_attribute_length, THREAD);
2513 return nullptr;
2514 }
2515 // Should we check that there hasn't already been a synthetic attribute?
2516 access_flags.set_is_synthetic();
2517 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2518 if (method_attribute_length != 0) {
2519 classfile_parse_error(
2520 "Invalid Deprecated method attribute length %u in class file %s",
2521 method_attribute_length, THREAD);
2522 return nullptr;
2523 }
2524 } else if (_major_version >= JAVA_1_5_VERSION) {
2525 if (method_attribute_name == vmSymbols::tag_signature()) {
2526 if (generic_signature_index != 0) {
2527 classfile_parse_error(
2528 "Multiple Signature attributes for method in class file %s",
2529 THREAD);
2530 return nullptr;
2531 }
2532 if (method_attribute_length != 2) {
2533 classfile_parse_error(
2534 "Invalid Signature attribute length %u in class file %s",
2535 method_attribute_length, THREAD);
2536 return nullptr;
2537 }
2538 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2539 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2540 if (runtime_visible_annotations != nullptr) {
2541 classfile_parse_error(
2542 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2543 THREAD);
2544 return nullptr;
2545 }
2546 runtime_visible_annotations_length = method_attribute_length;
2547 runtime_visible_annotations = cfs->current();
2548 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2549 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2550 parse_annotations(cp,
2551 runtime_visible_annotations,
2552 runtime_visible_annotations_length,
2553 &parsed_annotations,
2554 _loader_data,
2555 _can_access_vm_annotations);
2556 cfs->skip_u1_fast(runtime_visible_annotations_length);
2557 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2558 if (runtime_invisible_annotations_exists) {
2559 classfile_parse_error(
2560 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2561 THREAD);
2562 return nullptr;
2563 }
2564 runtime_invisible_annotations_exists = true;
2565 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2566 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2567 if (runtime_visible_parameter_annotations != nullptr) {
2568 classfile_parse_error(
2569 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2570 THREAD);
2571 return nullptr;
2572 }
2573 runtime_visible_parameter_annotations_length = method_attribute_length;
2574 runtime_visible_parameter_annotations = cfs->current();
2575 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2576 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2577 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2578 if (runtime_invisible_parameter_annotations_exists) {
2579 classfile_parse_error(
2580 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2581 THREAD);
2582 return nullptr;
2583 }
2584 runtime_invisible_parameter_annotations_exists = true;
2585 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2586 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2587 if (annotation_default != nullptr) {
2588 classfile_parse_error(
2589 "Multiple AnnotationDefault attributes for method in class file %s",
2590 THREAD);
2591 return nullptr;
2592 }
2593 annotation_default_length = method_attribute_length;
2594 annotation_default = cfs->current();
2595 assert(annotation_default != nullptr, "null annotation default");
2596 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2597 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2598 if (runtime_visible_type_annotations != nullptr) {
2599 classfile_parse_error(
2600 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2601 THREAD);
2602 return nullptr;
2603 }
2604 runtime_visible_type_annotations_length = method_attribute_length;
2605 runtime_visible_type_annotations = cfs->current();
2606 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2607 // No need for the VM to parse Type annotations
2608 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2609 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2610 if (runtime_invisible_type_annotations_exists) {
2611 classfile_parse_error(
2612 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2613 THREAD);
2614 return nullptr;
2615 }
2616 runtime_invisible_type_annotations_exists = true;
2617 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2618 } else {
2619 // Skip unknown attributes
2620 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2621 }
2622 } else {
2623 // Skip unknown attributes
2624 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2625 }
2626 }
2627
2628 if (linenumber_table != nullptr) {
2629 linenumber_table->write_terminator();
2630 linenumber_table_length = linenumber_table->position();
2631 }
2632
2633 // Make sure there's at least one Code attribute in non-native/non-abstract method
2634 if (_need_verify) {
2635 guarantee_property(access_flags.is_native() ||
2636 access_flags.is_abstract() ||
2637 parsed_code_attribute,
2638 "Absent Code attribute in method that is not native or abstract in class file %s",
2639 CHECK_NULL);
2640 }
2641
2642 // All sizing information for a Method* is finally available, now create it
2643 InlineTableSizes sizes(
2644 total_lvt_length,
2645 linenumber_table_length,
2646 exception_table_length,
2647 checked_exceptions_length,
2648 method_parameters_length,
2649 generic_signature_index,
2650 runtime_visible_annotations_length,
2651 runtime_visible_parameter_annotations_length,
2652 runtime_visible_type_annotations_length,
2653 annotation_default_length,
2654 0);
2655
2656 Method* const m = Method::allocate(_loader_data,
2657 code_length,
2658 access_flags,
2659 &sizes,
2660 ConstMethod::NORMAL,
2661 _cp->symbol_at(name_index),
2662 CHECK_NULL);
2663
2664 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2665
2666 // Fill in information from fixed part (access_flags already set)
2667 m->set_constants(_cp);
2668 m->set_name_index(name_index);
2669 m->set_signature_index(signature_index);
2670 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2671 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2672
2673 // Fill in code attribute information
2674 m->set_max_stack(max_stack);
2675 m->set_max_locals(max_locals);
2676 if (stackmap_data != nullptr) {
2677 m->constMethod()->copy_stackmap_data(_loader_data,
2678 (u1*)stackmap_data,
2679 stackmap_data_length,
2680 CHECK_NULL);
2681 }
2682
2683 // Copy byte codes
2684 m->set_code((u1*)code_start);
2685
2686 // Copy line number table
2687 if (linenumber_table != nullptr) {
2688 memcpy(m->compressed_linenumber_table(),
2689 linenumber_table->buffer(),
2690 linenumber_table_length);
2691 }
2692
2693 // Copy exception table
2694 if (exception_table_length > 0) {
2695 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2696 m->exception_table_start(),
2697 exception_table_length * sizeof(ExceptionTableElement),
2698 sizeof(u2));
2699 }
2700
2701 // Copy method parameters
2702 if (method_parameters_length > 0) {
2703 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2704 for (int i = 0; i < method_parameters_length; i++) {
2705 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2706 method_parameters_data += 2;
2707 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2708 method_parameters_data += 2;
2709 }
2710 }
2711
2712 // Copy checked exceptions
2713 if (checked_exceptions_length > 0) {
2714 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2715 m->checked_exceptions_start(),
2716 checked_exceptions_length * sizeof(CheckedExceptionElement),
2717 sizeof(u2));
2718 }
2719
2720 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2721 if (total_lvt_length > 0) {
2722 *has_localvariable_table = true;
2723 copy_localvariable_table(m->constMethod(),
2724 lvt_cnt,
2725 localvariable_table_length,
2726 localvariable_table_start,
2727 lvtt_cnt,
2728 localvariable_type_table_length,
2729 localvariable_type_table_start,
2730 CHECK_NULL);
2731 }
2732
2733 if (parsed_annotations.has_any_annotations())
2734 parsed_annotations.apply_to(methodHandle(THREAD, m));
2735
2736 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2737 m->set_is_hidden();
2738 }
2739
2740 // Copy annotations
2741 copy_method_annotations(m->constMethod(),
2742 runtime_visible_annotations,
2743 runtime_visible_annotations_length,
2744 runtime_visible_parameter_annotations,
2745 runtime_visible_parameter_annotations_length,
2746 runtime_visible_type_annotations,
2747 runtime_visible_type_annotations_length,
2748 annotation_default,
2749 annotation_default_length,
2750 CHECK_NULL);
2751
2752 if (InstanceKlass::is_finalization_enabled() &&
2753 name == vmSymbols::finalize_method_name() &&
2754 signature == vmSymbols::void_method_signature()) {
2755 if (m->is_empty_method()) {
2756 _has_empty_finalizer = true;
2757 } else {
2758 _has_finalizer = true;
2759 }
2760 }
2761
2762 NOT_PRODUCT(m->verify());
2763 return m;
2764 }
2765
2766
2767 // Side-effects: populates the _methods field in the parser
2768 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2769 bool is_interface,
2770 bool is_value_class,
2771 bool is_abstract_type,
2772 bool* const has_localvariable_table,
2773 bool* has_final_method,
2774 bool* declares_nonstatic_concrete_methods,
2775 TRAPS) {
2776 assert(cfs != nullptr, "invariant");
2777 assert(has_localvariable_table != nullptr, "invariant");
2778 assert(has_final_method != nullptr, "invariant");
2779 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2780
2781 assert(nullptr == _methods, "invariant");
2782
2783 cfs->guarantee_more(2, CHECK); // length
2784 const u2 length = cfs->get_u2_fast();
2785 if (length == 0) {
2786 _methods = Universe::the_empty_method_array();
2787 } else {
2788 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2789 length,
2790 nullptr,
2791 CHECK);
2792
2793 for (int index = 0; index < length; index++) {
2794 Method* method = parse_method(cfs,
2795 is_interface,
2796 is_value_class,
2797 is_abstract_type,
2798 _cp,
2799 has_localvariable_table,
2800 CHECK);
2801
2802 if (method->is_final()) {
2803 *has_final_method = true;
2804 }
2805 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2806 // used for interface initialization, and default method inheritance analysis
2807 if (is_interface && !(*declares_nonstatic_concrete_methods)
2808 && !method->is_abstract() && !method->is_static()) {
2809 *declares_nonstatic_concrete_methods = true;
2810 }
2811 _methods->at_put(index, method);
2812 }
2813
2814 if (_need_verify && length > 1) {
2815 // Check duplicated methods
2816 ResourceMark rm(THREAD);
2817 // Set containing name-signature pairs
2818 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2819 for (int i = 0; i < length; i++) {
2820 const Method* const m = _methods->at(i);
2821 NameSigHash name_and_sig(m->name(), m->signature());
2822 // If no duplicates, add name/signature in hashtable names_and_sigs.
2823 if(!names_and_sigs->put(name_and_sig, 0)) {
2824 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2825 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2826 return;
2827 }
2828 }
2829 }
2830 }
2831 }
2832
2833 static const intArray* sort_methods(Array<Method*>* methods) {
2834 const int length = methods->length();
2835 // If JVMTI original method ordering or sharing is enabled we have to
2836 // remember the original class file ordering.
2837 // We temporarily use the vtable_index field in the Method* to store the
2838 // class file index, so we can read in after calling qsort.
2839 // Put the method ordering in the shared archive.
2840 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2841 for (int index = 0; index < length; index++) {
2842 Method* const m = methods->at(index);
2843 assert(!m->valid_vtable_index(), "vtable index should not be set");
2844 m->set_vtable_index(index);
2845 }
2846 }
2847 // Sort method array by ascending method name (for faster lookups & vtable construction)
2848 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2849 Method::sort_methods(methods);
2850
2851 intArray* method_ordering = nullptr;
2852 // If JVMTI original method ordering or sharing is enabled construct int
2853 // array remembering the original ordering
2854 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2855 method_ordering = new intArray(length, length, -1);
2856 for (int index = 0; index < length; index++) {
2857 Method* const m = methods->at(index);
2858 const int old_index = m->vtable_index();
2859 assert(old_index >= 0 && old_index < length, "invalid method index");
2860 method_ordering->at_put(index, old_index);
2861 m->set_vtable_index(Method::invalid_vtable_index);
2862 }
2863 }
2864 return method_ordering;
2865 }
2866
2867 // Parse generic_signature attribute for methods and fields
2868 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2869 TRAPS) {
2870 assert(cfs != nullptr, "invariant");
2871
2872 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2873 const u2 generic_signature_index = cfs->get_u2_fast();
2874 guarantee_property(
2875 valid_symbol_at(generic_signature_index),
2876 "Invalid Signature attribute at constant pool index %u in class file %s",
2877 generic_signature_index, CHECK_0);
2878 return generic_signature_index;
2879 }
2880
2881 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2882 TRAPS) {
2883
2884 assert(cfs != nullptr, "invariant");
2885
2886 cfs->guarantee_more(2, CHECK); // sourcefile_index
2887 const u2 sourcefile_index = cfs->get_u2_fast();
2888 guarantee_property(
2889 valid_symbol_at(sourcefile_index),
2890 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2891 sourcefile_index, CHECK);
2892 set_class_sourcefile_index(sourcefile_index);
2893 }
2894
2895 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2896 int length,
2897 TRAPS) {
2898 assert(cfs != nullptr, "invariant");
2899
2900 const u1* const sde_buffer = cfs->current();
2901 assert(sde_buffer != nullptr, "null sde buffer");
2902
2903 // Don't bother storing it if there is no way to retrieve it
2904 if (JvmtiExport::can_get_source_debug_extension()) {
2905 assert((length+1) > length, "Overflow checking");
2906 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2907 for (int i = 0; i < length; i++) {
2908 sde[i] = sde_buffer[i];
2909 }
2910 sde[length] = '\0';
2911 set_class_sde_buffer((const char*)sde, length);
2912 }
2913 // Got utf8 string, set stream position forward
2914 cfs->skip_u1(length, CHECK);
2915 }
2916
2917
2918 // Inner classes can be static, private or protected (classic VM does this)
2919 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2920 JVM_ACC_PRIVATE | \
2921 JVM_ACC_PROTECTED | \
2922 JVM_ACC_STATIC \
2923 )
2924
2925 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2926 // Return -1 if none is found.
2927 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2928 Symbol* cp_klass_name = cp->klass_name_at(inner);
2929 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2930 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2931 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2932 return idx;
2933 }
2934 }
2935 return -1;
2936 }
2937
2938 // Return the outer_class_info_index for the InnerClasses entry containing the
2939 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2940 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2941 if (inner == 0) return -1;
2942 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2943 if (idx == -1) return -1;
2944 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2945 return result;
2946 }
2947
2948 // Return true if circularity is found, false if no circularity is found.
2949 // Use Floyd's cycle finding algorithm.
2950 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2951 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2952 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2953
2954 while (fast != -1 && fast != 0) {
2955 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2956 return true; // found a circularity
2957 }
2958 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2959 if (fast == -1) return false;
2960 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2961 if (fast == -1) return false;
2962 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2963 assert(slow != -1, "sanity check");
2964 }
2965 return false;
2966 }
2967
2968 // Loop through each InnerClasses entry checking for circularities and duplications
2969 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
2970 // return true if a circularity or entries with duplicate inner_class_info_indexes
2971 // are found.
2972 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2973 // Loop through each InnerClasses entry.
2974 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2975 // Return true if there are circular entries.
2976 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2977 return true;
2978 }
2979 // Check if there are duplicate entries or entries with the same inner_class_info_index.
2980 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2981 y += InstanceKlass::inner_class_next_offset) {
2982
2983 // 4347400: make sure there's no duplicate entry in the classes array
2984 if (_major_version >= JAVA_1_5_VERSION) {
2985 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2986 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2987 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2988 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2989 "Duplicate entry in InnerClasses attribute in class file %s",
2990 CHECK_(true));
2991 }
2992 // Return true if there are two entries with the same inner_class_info_index.
2993 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2994 return true;
2995 }
2996 }
2997 }
2998 return false;
2999 }
3000
3001 // Return number of classes in the inner classes attribute table
3002 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3003 const ConstantPool* cp,
3004 const u1* const inner_classes_attribute_start,
3005 bool parsed_enclosingmethod_attribute,
3006 u2 enclosing_method_class_index,
3007 u2 enclosing_method_method_index,
3008 TRAPS) {
3009 const u1* const current_mark = cfs->current();
3010 u2 length = 0;
3011 if (inner_classes_attribute_start != nullptr) {
3012 cfs->set_current(inner_classes_attribute_start);
3013 cfs->guarantee_more(2, CHECK_0); // length
3014 length = cfs->get_u2_fast();
3015 }
3016
3017 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3018 // method data:
3019 // [inner_class_info_index,
3020 // outer_class_info_index,
3021 // inner_name_index,
3022 // inner_class_access_flags,
3023 // ...
3024 // enclosing_method_class_index,
3025 // enclosing_method_method_index]
3026 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3027 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3028 _inner_classes = inner_classes;
3029
3030 int index = 0;
3031 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3032 for (int n = 0; n < length; n++) {
3033 // Inner class index
3034 const u2 inner_class_info_index = cfs->get_u2_fast();
3035 guarantee_property(
3036 valid_klass_reference_at(inner_class_info_index),
3037 "inner_class_info_index %u has bad constant type in class file %s",
3038 inner_class_info_index, CHECK_0);
3039 // Outer class index
3040 const u2 outer_class_info_index = cfs->get_u2_fast();
3041 guarantee_property(
3042 outer_class_info_index == 0 ||
3043 valid_klass_reference_at(outer_class_info_index),
3044 "outer_class_info_index %u has bad constant type in class file %s",
3045 outer_class_info_index, CHECK_0);
3046
3047 if (outer_class_info_index != 0) {
3048 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3049 char* bytes = (char*)outer_class_name->bytes();
3050 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3051 "Outer class is an array class in class file %s", CHECK_0);
3052 }
3053 // Inner class name
3054 const u2 inner_name_index = cfs->get_u2_fast();
3055 guarantee_property(
3056 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3057 "inner_name_index %u has bad constant type in class file %s",
3058 inner_name_index, CHECK_0);
3059 if (_need_verify) {
3060 guarantee_property(inner_class_info_index != outer_class_info_index,
3061 "Class is both outer and inner class in class file %s", CHECK_0);
3062 }
3063
3064 u2 recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3065 // JVM_ACC_MODULE is defined in JDK-9 and later.
3066 if (_major_version >= JAVA_9_VERSION) {
3067 recognized_modifiers |= JVM_ACC_MODULE;
3068 }
3069
3070 // Access flags
3071 u2 flags = cfs->get_u2_fast() & recognized_modifiers;
3072
3073 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3074 // Set abstract bit for old class files for backward compatibility
3075 flags |= JVM_ACC_ABSTRACT;
3076 }
3077
3078 if (!supports_inline_types()) {
3079 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3080 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3081 if (!is_module && !is_interface) {
3082 flags |= JVM_ACC_IDENTITY;
3083 }
3084 }
3085
3086 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3087 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3088 AccessFlags inner_access_flags(flags);
3089
3090 inner_classes->at_put(index++, inner_class_info_index);
3091 inner_classes->at_put(index++, outer_class_info_index);
3092 inner_classes->at_put(index++, inner_name_index);
3093 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3094 }
3095
3096 // Check for circular and duplicate entries.
3097 bool has_circularity = false;
3098 if (_need_verify) {
3099 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3100 if (has_circularity) {
3101 // If circularity check failed then ignore InnerClasses attribute.
3102 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3103 index = 0;
3104 if (parsed_enclosingmethod_attribute) {
3105 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3106 _inner_classes = inner_classes;
3107 } else {
3108 _inner_classes = Universe::the_empty_short_array();
3109 }
3110 }
3111 }
3112 // Set EnclosingMethod class and method indexes.
3113 if (parsed_enclosingmethod_attribute) {
3114 inner_classes->at_put(index++, enclosing_method_class_index);
3115 inner_classes->at_put(index++, enclosing_method_method_index);
3116 }
3117 assert(index == size || has_circularity, "wrong size");
3118
3119 // Restore buffer's current position.
3120 cfs->set_current(current_mark);
3121
3122 return length;
3123 }
3124
3125 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3126 const u1* const nest_members_attribute_start,
3127 TRAPS) {
3128 const u1* const current_mark = cfs->current();
3129 u2 length = 0;
3130 if (nest_members_attribute_start != nullptr) {
3131 cfs->set_current(nest_members_attribute_start);
3132 cfs->guarantee_more(2, CHECK_0); // length
3133 length = cfs->get_u2_fast();
3134 }
3135 const int size = length;
3136 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3137 _nest_members = nest_members;
3138
3139 int index = 0;
3140 cfs->guarantee_more(2 * length, CHECK_0);
3141 for (int n = 0; n < length; n++) {
3142 const u2 class_info_index = cfs->get_u2_fast();
3143 guarantee_property(
3144 valid_klass_reference_at(class_info_index),
3145 "Nest member class_info_index %u has bad constant type in class file %s",
3146 class_info_index, CHECK_0);
3147 nest_members->at_put(index++, class_info_index);
3148 }
3149 assert(index == size, "wrong size");
3150
3151 // Restore buffer's current position.
3152 cfs->set_current(current_mark);
3153
3154 return length;
3155 }
3156
3157 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3158 const u1* const permitted_subclasses_attribute_start,
3159 TRAPS) {
3160 const u1* const current_mark = cfs->current();
3161 u2 length = 0;
3162 if (permitted_subclasses_attribute_start != nullptr) {
3163 cfs->set_current(permitted_subclasses_attribute_start);
3164 cfs->guarantee_more(2, CHECK_0); // length
3165 length = cfs->get_u2_fast();
3166 }
3167 const int size = length;
3168 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3169 _permitted_subclasses = permitted_subclasses;
3170
3171 if (length > 0) {
3172 int index = 0;
3173 cfs->guarantee_more(2 * length, CHECK_0);
3174 for (int n = 0; n < length; n++) {
3175 const u2 class_info_index = cfs->get_u2_fast();
3176 guarantee_property(
3177 valid_klass_reference_at(class_info_index),
3178 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3179 class_info_index, CHECK_0);
3180 permitted_subclasses->at_put(index++, class_info_index);
3181 }
3182 assert(index == size, "wrong size");
3183 }
3184
3185 // Restore buffer's current position.
3186 cfs->set_current(current_mark);
3187
3188 return length;
3189 }
3190
3191 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3192 const u1* const loadable_descriptors_attribute_start,
3193 TRAPS) {
3194 const u1* const current_mark = cfs->current();
3195 u2 length = 0;
3196 if (loadable_descriptors_attribute_start != nullptr) {
3197 cfs->set_current(loadable_descriptors_attribute_start);
3198 cfs->guarantee_more(2, CHECK_0); // length
3199 length = cfs->get_u2_fast();
3200 }
3201 const int size = length;
3202 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3203 _loadable_descriptors = loadable_descriptors;
3204 if (length > 0) {
3205 int index = 0;
3206 cfs->guarantee_more(2 * length, CHECK_0);
3207 for (int n = 0; n < length; n++) {
3208 const u2 descriptor_index = cfs->get_u2_fast();
3209 guarantee_property(
3210 valid_symbol_at(descriptor_index),
3211 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3212 descriptor_index, CHECK_0);
3213 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3214 bool valid = legal_field_signature(descriptor, CHECK_0);
3215 if(!valid) {
3216 ResourceMark rm(THREAD);
3217 Exceptions::fthrow(THREAD_AND_LOCATION,
3218 vmSymbols::java_lang_ClassFormatError(),
3219 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3220 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3221 return 0;
3222 }
3223 loadable_descriptors->at_put(index++, descriptor_index);
3224 }
3225 assert(index == size, "wrong size");
3226 }
3227
3228 // Restore buffer's current position.
3229 cfs->set_current(current_mark);
3230
3231 return length;
3232 }
3233
3234 // Record {
3235 // u2 attribute_name_index;
3236 // u4 attribute_length;
3237 // u2 components_count;
3238 // component_info components[components_count];
3239 // }
3240 // component_info {
3241 // u2 name_index;
3242 // u2 descriptor_index
3243 // u2 attributes_count;
3244 // attribute_info_attributes[attributes_count];
3245 // }
3246 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3247 const ConstantPool* cp,
3248 const u1* const record_attribute_start,
3249 TRAPS) {
3250 const u1* const current_mark = cfs->current();
3251 int components_count = 0;
3252 unsigned int calculate_attr_size = 0;
3253 if (record_attribute_start != nullptr) {
3254 cfs->set_current(record_attribute_start);
3255 cfs->guarantee_more(2, CHECK_0); // num of components
3256 components_count = (int)cfs->get_u2_fast();
3257 calculate_attr_size = 2;
3258 }
3259
3260 Array<RecordComponent*>* const record_components =
3261 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3262 _record_components = record_components;
3263
3264 for (int x = 0; x < components_count; x++) {
3265 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3266
3267 const u2 name_index = cfs->get_u2_fast();
3268 guarantee_property(valid_symbol_at(name_index),
3269 "Invalid constant pool index %u for name in Record attribute in class file %s",
3270 name_index, CHECK_0);
3271 const Symbol* const name = cp->symbol_at(name_index);
3272 verify_legal_field_name(name, CHECK_0);
3273
3274 const u2 descriptor_index = cfs->get_u2_fast();
3275 guarantee_property(valid_symbol_at(descriptor_index),
3276 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3277 descriptor_index, CHECK_0);
3278 const Symbol* const descr = cp->symbol_at(descriptor_index);
3279 verify_legal_field_signature(name, descr, CHECK_0);
3280
3281 const u2 attributes_count = cfs->get_u2_fast();
3282 calculate_attr_size += 6;
3283 u2 generic_sig_index = 0;
3284 const u1* runtime_visible_annotations = nullptr;
3285 int runtime_visible_annotations_length = 0;
3286 bool runtime_invisible_annotations_exists = false;
3287 const u1* runtime_visible_type_annotations = nullptr;
3288 int runtime_visible_type_annotations_length = 0;
3289 bool runtime_invisible_type_annotations_exists = false;
3290
3291 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3292 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3293 for (int y = 0; y < attributes_count; y++) {
3294 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3295 const u2 attribute_name_index = cfs->get_u2_fast();
3296 const u4 attribute_length = cfs->get_u4_fast();
3297 calculate_attr_size += 6;
3298 guarantee_property(
3299 valid_symbol_at(attribute_name_index),
3300 "Invalid Record attribute name index %u in class file %s",
3301 attribute_name_index, CHECK_0);
3302
3303 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3304 if (attribute_name == vmSymbols::tag_signature()) {
3305 if (generic_sig_index != 0) {
3306 classfile_parse_error(
3307 "Multiple Signature attributes for Record component in class file %s",
3308 THREAD);
3309 return 0;
3310 }
3311 if (attribute_length != 2) {
3312 classfile_parse_error(
3313 "Invalid Signature attribute length %u in Record component in class file %s",
3314 attribute_length, THREAD);
3315 return 0;
3316 }
3317 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3318
3319 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3320 if (runtime_visible_annotations != nullptr) {
3321 classfile_parse_error(
3322 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3323 return 0;
3324 }
3325 runtime_visible_annotations_length = attribute_length;
3326 runtime_visible_annotations = cfs->current();
3327
3328 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3329 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3330 cfs->skip_u1_fast(runtime_visible_annotations_length);
3331
3332 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3333 if (runtime_invisible_annotations_exists) {
3334 classfile_parse_error(
3335 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3336 return 0;
3337 }
3338 runtime_invisible_annotations_exists = true;
3339 cfs->skip_u1(attribute_length, CHECK_0);
3340
3341 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3342 if (runtime_visible_type_annotations != nullptr) {
3343 classfile_parse_error(
3344 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3345 return 0;
3346 }
3347 runtime_visible_type_annotations_length = attribute_length;
3348 runtime_visible_type_annotations = cfs->current();
3349
3350 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3351 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3352 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3353
3354 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3355 if (runtime_invisible_type_annotations_exists) {
3356 classfile_parse_error(
3357 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3358 return 0;
3359 }
3360 runtime_invisible_type_annotations_exists = true;
3361 cfs->skip_u1(attribute_length, CHECK_0);
3362
3363 } else {
3364 // Skip unknown attributes
3365 cfs->skip_u1(attribute_length, CHECK_0);
3366 }
3367 calculate_attr_size += attribute_length;
3368 } // End of attributes For loop
3369
3370 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3371 runtime_visible_annotations_length,
3372 CHECK_0);
3373 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3374 runtime_visible_type_annotations_length,
3375 CHECK_0);
3376
3377 RecordComponent* record_component =
3378 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3379 annotations, type_annotations, CHECK_0);
3380 record_components->at_put(x, record_component);
3381 } // End of component processing loop
3382
3383 // Restore buffer's current position.
3384 cfs->set_current(current_mark);
3385 return calculate_attr_size;
3386 }
3387
3388 void ClassFileParser::parse_classfile_synthetic_attribute() {
3389 set_class_synthetic_flag(true);
3390 }
3391
3392 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3393 assert(cfs != nullptr, "invariant");
3394
3395 const u2 signature_index = cfs->get_u2(CHECK);
3396 guarantee_property(
3397 valid_symbol_at(signature_index),
3398 "Invalid constant pool index %u in Signature attribute in class file %s",
3399 signature_index, CHECK);
3400 set_class_generic_signature_index(signature_index);
3401 }
3402
3403 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3404 ConstantPool* cp,
3405 u4 attribute_byte_length,
3406 TRAPS) {
3407 assert(cfs != nullptr, "invariant");
3408 assert(cp != nullptr, "invariant");
3409
3410 const u1* const current_start = cfs->current();
3411
3412 guarantee_property(attribute_byte_length >= sizeof(u2),
3413 "Invalid BootstrapMethods attribute length %u in class file %s",
3414 attribute_byte_length,
3415 CHECK);
3416
3417 cfs->guarantee_more(attribute_byte_length, CHECK);
3418
3419 const int attribute_array_length = cfs->get_u2_fast();
3420
3421 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3422 "Short length on BootstrapMethods in class file %s",
3423 CHECK);
3424
3425
3426 // The attribute contains a counted array of counted tuples of shorts,
3427 // represending bootstrap specifiers:
3428 // length*{bootstrap_method_index, argument_count*{argument_index}}
3429 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3430 // operand_count = number of shorts in attr, except for leading length
3431
3432 // The attribute is copied into a short[] array.
3433 // The array begins with a series of short[2] pairs, one for each tuple.
3434 const int index_size = (attribute_array_length * 2);
3435
3436 Array<u2>* const operands =
3437 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3438
3439 // Eagerly assign operands so they will be deallocated with the constant
3440 // pool if there is an error.
3441 cp->set_operands(operands);
3442
3443 int operand_fill_index = index_size;
3444 const int cp_size = cp->length();
3445
3446 for (int n = 0; n < attribute_array_length; n++) {
3447 // Store a 32-bit offset into the header of the operand array.
3448 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3449
3450 // Read a bootstrap specifier.
3451 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3452 const u2 bootstrap_method_index = cfs->get_u2_fast();
3453 const u2 argument_count = cfs->get_u2_fast();
3454 guarantee_property(
3455 valid_cp_range(bootstrap_method_index, cp_size) &&
3456 cp->tag_at(bootstrap_method_index).is_method_handle(),
3457 "bootstrap_method_index %u has bad constant type in class file %s",
3458 bootstrap_method_index,
3459 CHECK);
3460
3461 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3462 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3463 CHECK);
3464
3465 operands->at_put(operand_fill_index++, bootstrap_method_index);
3466 operands->at_put(operand_fill_index++, argument_count);
3467
3468 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3469 for (int j = 0; j < argument_count; j++) {
3470 const u2 argument_index = cfs->get_u2_fast();
3471 guarantee_property(
3472 valid_cp_range(argument_index, cp_size) &&
3473 cp->tag_at(argument_index).is_loadable_constant(),
3474 "argument_index %u has bad constant type in class file %s",
3475 argument_index,
3476 CHECK);
3477 operands->at_put(operand_fill_index++, argument_index);
3478 }
3479 }
3480 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3481 "Bad length on BootstrapMethods in class file %s",
3482 CHECK);
3483 }
3484
3485 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3486 ConstantPool* cp,
3487 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3488 TRAPS) {
3489 assert(cfs != nullptr, "invariant");
3490 assert(cp != nullptr, "invariant");
3491 assert(parsed_annotations != nullptr, "invariant");
3492
3493 // Set inner classes attribute to default sentinel
3494 _inner_classes = Universe::the_empty_short_array();
3495 // Set nest members attribute to default sentinel
3496 _nest_members = Universe::the_empty_short_array();
3497 // Set _permitted_subclasses attribute to default sentinel
3498 _permitted_subclasses = Universe::the_empty_short_array();
3499 // Set _loadable_descriptors attribute to default sentinel
3500 _loadable_descriptors = Universe::the_empty_short_array();
3501 cfs->guarantee_more(2, CHECK); // attributes_count
3502 u2 attributes_count = cfs->get_u2_fast();
3503 bool parsed_sourcefile_attribute = false;
3504 bool parsed_innerclasses_attribute = false;
3505 bool parsed_nest_members_attribute = false;
3506 bool parsed_permitted_subclasses_attribute = false;
3507 bool parsed_loadable_descriptors_attribute = false;
3508 bool parsed_nest_host_attribute = false;
3509 bool parsed_record_attribute = false;
3510 bool parsed_enclosingmethod_attribute = false;
3511 bool parsed_bootstrap_methods_attribute = false;
3512 const u1* runtime_visible_annotations = nullptr;
3513 int runtime_visible_annotations_length = 0;
3514 const u1* runtime_visible_type_annotations = nullptr;
3515 int runtime_visible_type_annotations_length = 0;
3516 bool runtime_invisible_type_annotations_exists = false;
3517 bool runtime_invisible_annotations_exists = false;
3518 bool parsed_source_debug_ext_annotations_exist = false;
3519 const u1* inner_classes_attribute_start = nullptr;
3520 u4 inner_classes_attribute_length = 0;
3521 u2 enclosing_method_class_index = 0;
3522 u2 enclosing_method_method_index = 0;
3523 const u1* nest_members_attribute_start = nullptr;
3524 u4 nest_members_attribute_length = 0;
3525 const u1* record_attribute_start = nullptr;
3526 u4 record_attribute_length = 0;
3527 const u1* permitted_subclasses_attribute_start = nullptr;
3528 u4 permitted_subclasses_attribute_length = 0;
3529 const u1* loadable_descriptors_attribute_start = nullptr;
3530 u4 loadable_descriptors_attribute_length = 0;
3531
3532 // Iterate over attributes
3533 while (attributes_count--) {
3534 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3535 const u2 attribute_name_index = cfs->get_u2_fast();
3536 const u4 attribute_length = cfs->get_u4_fast();
3537 guarantee_property(
3538 valid_symbol_at(attribute_name_index),
3539 "Attribute name has bad constant pool index %u in class file %s",
3540 attribute_name_index, CHECK);
3541 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3542 if (tag == vmSymbols::tag_source_file()) {
3543 // Check for SourceFile tag
3544 if (_need_verify) {
3545 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3546 }
3547 if (parsed_sourcefile_attribute) {
3548 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3549 return;
3550 } else {
3551 parsed_sourcefile_attribute = true;
3552 }
3553 parse_classfile_sourcefile_attribute(cfs, CHECK);
3554 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3555 // Check for SourceDebugExtension tag
3556 if (parsed_source_debug_ext_annotations_exist) {
3557 classfile_parse_error(
3558 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3559 return;
3560 }
3561 parsed_source_debug_ext_annotations_exist = true;
3562 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3563 } else if (tag == vmSymbols::tag_inner_classes()) {
3564 // Check for InnerClasses tag
3565 if (parsed_innerclasses_attribute) {
3566 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3567 return;
3568 } else {
3569 parsed_innerclasses_attribute = true;
3570 }
3571 inner_classes_attribute_start = cfs->current();
3572 inner_classes_attribute_length = attribute_length;
3573 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3574 } else if (tag == vmSymbols::tag_synthetic()) {
3575 // Check for Synthetic tag
3576 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3577 if (attribute_length != 0) {
3578 classfile_parse_error(
3579 "Invalid Synthetic classfile attribute length %u in class file %s",
3580 attribute_length, THREAD);
3581 return;
3582 }
3583 parse_classfile_synthetic_attribute();
3584 } else if (tag == vmSymbols::tag_deprecated()) {
3585 // Check for Deprecated tag - 4276120
3586 if (attribute_length != 0) {
3587 classfile_parse_error(
3588 "Invalid Deprecated classfile attribute length %u in class file %s",
3589 attribute_length, THREAD);
3590 return;
3591 }
3592 } else if (_major_version >= JAVA_1_5_VERSION) {
3593 if (tag == vmSymbols::tag_signature()) {
3594 if (_generic_signature_index != 0) {
3595 classfile_parse_error(
3596 "Multiple Signature attributes in class file %s", THREAD);
3597 return;
3598 }
3599 if (attribute_length != 2) {
3600 classfile_parse_error(
3601 "Wrong Signature attribute length %u in class file %s",
3602 attribute_length, THREAD);
3603 return;
3604 }
3605 parse_classfile_signature_attribute(cfs, CHECK);
3606 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3607 if (runtime_visible_annotations != nullptr) {
3608 classfile_parse_error(
3609 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3610 return;
3611 }
3612 runtime_visible_annotations_length = attribute_length;
3613 runtime_visible_annotations = cfs->current();
3614 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3615 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3616 parse_annotations(cp,
3617 runtime_visible_annotations,
3618 runtime_visible_annotations_length,
3619 parsed_annotations,
3620 _loader_data,
3621 _can_access_vm_annotations);
3622 cfs->skip_u1_fast(runtime_visible_annotations_length);
3623 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3624 if (runtime_invisible_annotations_exists) {
3625 classfile_parse_error(
3626 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3627 return;
3628 }
3629 runtime_invisible_annotations_exists = true;
3630 cfs->skip_u1(attribute_length, CHECK);
3631 } else if (tag == vmSymbols::tag_enclosing_method()) {
3632 if (parsed_enclosingmethod_attribute) {
3633 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3634 return;
3635 } else {
3636 parsed_enclosingmethod_attribute = true;
3637 }
3638 guarantee_property(attribute_length == 4,
3639 "Wrong EnclosingMethod attribute length %u in class file %s",
3640 attribute_length, CHECK);
3641 cfs->guarantee_more(4, CHECK); // class_index, method_index
3642 enclosing_method_class_index = cfs->get_u2_fast();
3643 enclosing_method_method_index = cfs->get_u2_fast();
3644 if (enclosing_method_class_index == 0) {
3645 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3646 return;
3647 }
3648 // Validate the constant pool indices and types
3649 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3650 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3651 if (enclosing_method_method_index != 0 &&
3652 (!cp->is_within_bounds(enclosing_method_method_index) ||
3653 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3654 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3655 return;
3656 }
3657 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3658 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3659 if (parsed_bootstrap_methods_attribute) {
3660 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3661 return;
3662 }
3663 parsed_bootstrap_methods_attribute = true;
3664 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3665 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3666 if (runtime_visible_type_annotations != nullptr) {
3667 classfile_parse_error(
3668 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3669 return;
3670 }
3671 runtime_visible_type_annotations_length = attribute_length;
3672 runtime_visible_type_annotations = cfs->current();
3673 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3674 // No need for the VM to parse Type annotations
3675 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3676 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3677 if (runtime_invisible_type_annotations_exists) {
3678 classfile_parse_error(
3679 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3680 return;
3681 }
3682 runtime_invisible_type_annotations_exists = true;
3683 cfs->skip_u1(attribute_length, CHECK);
3684 } else if (_major_version >= JAVA_11_VERSION) {
3685 if (tag == vmSymbols::tag_nest_members()) {
3686 // Check for NestMembers tag
3687 if (parsed_nest_members_attribute) {
3688 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3689 return;
3690 } else {
3691 parsed_nest_members_attribute = true;
3692 }
3693 if (parsed_nest_host_attribute) {
3694 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3695 return;
3696 }
3697 nest_members_attribute_start = cfs->current();
3698 nest_members_attribute_length = attribute_length;
3699 cfs->skip_u1(nest_members_attribute_length, CHECK);
3700 } else if (tag == vmSymbols::tag_nest_host()) {
3701 if (parsed_nest_host_attribute) {
3702 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3703 return;
3704 } else {
3705 parsed_nest_host_attribute = true;
3706 }
3707 if (parsed_nest_members_attribute) {
3708 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3709 return;
3710 }
3711 if (_need_verify) {
3712 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3713 }
3714 cfs->guarantee_more(2, CHECK);
3715 u2 class_info_index = cfs->get_u2_fast();
3716 guarantee_property(
3717 valid_klass_reference_at(class_info_index),
3718 "Nest-host class_info_index %u has bad constant type in class file %s",
3719 class_info_index, CHECK);
3720 _nest_host = class_info_index;
3721
3722 } else if (_major_version >= JAVA_16_VERSION) {
3723 if (tag == vmSymbols::tag_record()) {
3724 if (parsed_record_attribute) {
3725 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3726 return;
3727 }
3728 parsed_record_attribute = true;
3729 record_attribute_start = cfs->current();
3730 record_attribute_length = attribute_length;
3731 } else if (_major_version >= JAVA_17_VERSION) {
3732 if (tag == vmSymbols::tag_permitted_subclasses()) {
3733 if (parsed_permitted_subclasses_attribute) {
3734 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3735 return;
3736 }
3737 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3738 if (_access_flags.is_final()) {
3739 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3740 return;
3741 }
3742 parsed_permitted_subclasses_attribute = true;
3743 permitted_subclasses_attribute_start = cfs->current();
3744 permitted_subclasses_attribute_length = attribute_length;
3745 }
3746 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3747 if (parsed_loadable_descriptors_attribute) {
3748 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3749 return;
3750 }
3751 parsed_loadable_descriptors_attribute = true;
3752 loadable_descriptors_attribute_start = cfs->current();
3753 loadable_descriptors_attribute_length = attribute_length;
3754 }
3755 }
3756 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3757 cfs->skip_u1(attribute_length, CHECK);
3758 } else {
3759 // Unknown attribute
3760 cfs->skip_u1(attribute_length, CHECK);
3761 }
3762 } else {
3763 // Unknown attribute
3764 cfs->skip_u1(attribute_length, CHECK);
3765 }
3766 } else {
3767 // Unknown attribute
3768 cfs->skip_u1(attribute_length, CHECK);
3769 }
3770 }
3771 _class_annotations = allocate_annotations(runtime_visible_annotations,
3772 runtime_visible_annotations_length,
3773 CHECK);
3774 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3775 runtime_visible_type_annotations_length,
3776 CHECK);
3777
3778 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3779 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3780 cfs,
3781 cp,
3782 inner_classes_attribute_start,
3783 parsed_innerclasses_attribute,
3784 enclosing_method_class_index,
3785 enclosing_method_method_index,
3786 CHECK);
3787 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3788 guarantee_property(
3789 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3790 "Wrong InnerClasses attribute length in class file %s", CHECK);
3791 }
3792 }
3793
3794 if (parsed_nest_members_attribute) {
3795 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3796 cfs,
3797 nest_members_attribute_start,
3798 CHECK);
3799 if (_need_verify) {
3800 guarantee_property(
3801 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3802 "Wrong NestMembers attribute length in class file %s", CHECK);
3803 }
3804 }
3805
3806 if (parsed_record_attribute) {
3807 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3808 cfs,
3809 cp,
3810 record_attribute_start,
3811 CHECK);
3812 if (_need_verify) {
3813 guarantee_property(record_attribute_length == calculated_attr_length,
3814 "Record attribute has wrong length in class file %s",
3815 CHECK);
3816 }
3817 }
3818
3819 if (parsed_permitted_subclasses_attribute) {
3820 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3821 cfs,
3822 permitted_subclasses_attribute_start,
3823 CHECK);
3824 if (_need_verify) {
3825 guarantee_property(
3826 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3827 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3828 }
3829 }
3830
3831 if (parsed_loadable_descriptors_attribute) {
3832 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3833 cfs,
3834 loadable_descriptors_attribute_start,
3835 CHECK);
3836 if (_need_verify) {
3837 guarantee_property(
3838 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3839 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3840 }
3841 }
3842
3843 if (_max_bootstrap_specifier_index >= 0) {
3844 guarantee_property(parsed_bootstrap_methods_attribute,
3845 "Missing BootstrapMethods attribute in class file %s", CHECK);
3846 }
3847 }
3848
3849 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3850 assert(k != nullptr, "invariant");
3851
3852 if (_synthetic_flag)
3853 k->set_is_synthetic();
3854 if (_sourcefile_index != 0) {
3855 k->set_source_file_name_index(_sourcefile_index);
3856 }
3857 if (_generic_signature_index != 0) {
3858 k->set_generic_signature_index(_generic_signature_index);
3859 }
3860 if (_sde_buffer != nullptr) {
3861 k->set_source_debug_extension(_sde_buffer, _sde_length);
3862 }
3863 }
3864
3865 // Create the Annotations object that will
3866 // hold the annotations array for the Klass.
3867 void ClassFileParser::create_combined_annotations(TRAPS) {
3868 if (_class_annotations == nullptr &&
3869 _class_type_annotations == nullptr &&
3870 _fields_annotations == nullptr &&
3871 _fields_type_annotations == nullptr) {
3872 // Don't create the Annotations object unnecessarily.
3873 return;
3874 }
3875
3876 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3877 annotations->set_class_annotations(_class_annotations);
3878 annotations->set_class_type_annotations(_class_type_annotations);
3879 annotations->set_fields_annotations(_fields_annotations);
3880 annotations->set_fields_type_annotations(_fields_type_annotations);
3881
3882 // This is the Annotations object that will be
3883 // assigned to InstanceKlass being constructed.
3884 _combined_annotations = annotations;
3885
3886 // The annotations arrays below has been transferred the
3887 // _combined_annotations so these fields can now be cleared.
3888 _class_annotations = nullptr;
3889 _class_type_annotations = nullptr;
3890 _fields_annotations = nullptr;
3891 _fields_type_annotations = nullptr;
3892 }
3893
3894 // Transfer ownership of metadata allocated to the InstanceKlass.
3895 void ClassFileParser::apply_parsed_class_metadata(
3896 InstanceKlass* this_klass,
3897 int java_fields_count) {
3898 assert(this_klass != nullptr, "invariant");
3899
3900 _cp->set_pool_holder(this_klass);
3901 this_klass->set_constants(_cp);
3902 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3903 this_klass->set_fields_status(_fields_status);
3904 this_klass->set_methods(_methods);
3905 this_klass->set_inner_classes(_inner_classes);
3906 this_klass->set_nest_members(_nest_members);
3907 this_klass->set_nest_host_index(_nest_host);
3908 this_klass->set_loadable_descriptors(_loadable_descriptors);
3909 this_klass->set_annotations(_combined_annotations);
3910 this_klass->set_permitted_subclasses(_permitted_subclasses);
3911 this_klass->set_record_components(_record_components);
3912 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3913
3914 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3915 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3916 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3917 // its _super. If an OOM occurs while loading the current klass, its _super field
3918 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3919 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3920 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3921
3922 // Clear out these fields so they don't get deallocated by the destructor
3923 clear_class_metadata();
3924 }
3925
3926 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3927 int anno_length,
3928 TRAPS) {
3929 AnnotationArray* annotations = nullptr;
3930 if (anno != nullptr) {
3931 annotations = MetadataFactory::new_array<u1>(_loader_data,
3932 anno_length,
3933 CHECK_(annotations));
3934 for (int i = 0; i < anno_length; i++) {
3935 annotations->at_put(i, anno[i]);
3936 }
3937 }
3938 return annotations;
3939 }
3940
3941 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3942 const int super_class_index,
3943 const bool need_verify,
3944 TRAPS) {
3945 assert(cp != nullptr, "invariant");
3946 const InstanceKlass* super_klass = nullptr;
3947
3948 if (super_class_index == 0) {
3949 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3950 "Invalid superclass index 0 in class file %s",
3951 CHECK_NULL);
3952 } else {
3953 guarantee_property(valid_klass_reference_at(super_class_index),
3954 "Invalid superclass index %u in class file %s",
3955 super_class_index,
3956 CHECK_NULL);
3957 // The class name should be legal because it is checked when parsing constant pool.
3958 // However, make sure it is not an array type.
3959 if (cp->tag_at(super_class_index).is_klass()) {
3960 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3961 }
3962 if (need_verify) {
3963 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3964 guarantee_property(!is_array,
3965 "Bad superclass name in class file %s", CHECK_NULL);
3966 }
3967 }
3968 return super_klass;
3969 }
3970
3971 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3972 _max_nonstatic_oop_maps = max_blocks;
3973 _nonstatic_oop_map_count = 0;
3974 if (max_blocks == 0) {
3975 _nonstatic_oop_maps = nullptr;
3976 } else {
3977 _nonstatic_oop_maps =
3978 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3979 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3980 }
3981 }
3982
3983 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3984 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3985 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3986 }
3987
3988 // addition of super oop maps
3989 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3990 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3991 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3992
3993 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3994 _nonstatic_oop_map_count += nof_blocks;
3995 }
3996
3997 // collection of oops
3998 void OopMapBlocksBuilder::add(int offset, int count) {
3999 if (_nonstatic_oop_map_count == 0) {
4000 _nonstatic_oop_map_count++;
4001 }
4002 OopMapBlock* nonstatic_oop_map = last_oop_map();
4003 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4004 nonstatic_oop_map->set_offset(offset);
4005 nonstatic_oop_map->set_count(count);
4006 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4007 nonstatic_oop_map->increment_count(count);
4008 } else { // Need a new one...
4009 _nonstatic_oop_map_count++;
4010 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4011 nonstatic_oop_map = last_oop_map();
4012 nonstatic_oop_map->set_offset(offset);
4013 nonstatic_oop_map->set_count(count);
4014 }
4015 }
4016
4017 // general purpose copy, e.g. into allocated instanceKlass
4018 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4019 if (_nonstatic_oop_map_count != 0) {
4020 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4021 }
4022 }
4023
4024 // Sort and compact adjacent blocks
4025 void OopMapBlocksBuilder::compact() {
4026 if (_nonstatic_oop_map_count <= 1) {
4027 return;
4028 }
4029 /*
4030 * Since field layout sneaks in oops before values, we will be able to condense
4031 * blocks. There is potential to compact between super, own refs and values
4032 * containing refs.
4033 *
4034 * Currently compaction is slightly limited due to values being 8 byte aligned.
4035 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4036 * and maybe it doesn't need to be.
4037 */
4038 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4039 (_sort_Fn)OopMapBlock::compare_offset);
4040 if (_nonstatic_oop_map_count < 2) {
4041 return;
4042 }
4043
4044 // Make a temp copy, and iterate through and copy back into the original
4045 ResourceMark rm;
4046 OopMapBlock* oop_maps_copy =
4047 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4048 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4049 copy(oop_maps_copy);
4050 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4051 unsigned int new_count = 1;
4052 oop_maps_copy++;
4053 while(oop_maps_copy < oop_maps_copy_end) {
4054 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4055 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4056 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4057 } else {
4058 nonstatic_oop_map++;
4059 new_count++;
4060 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4061 nonstatic_oop_map->set_count(oop_maps_copy->count());
4062 }
4063 oop_maps_copy++;
4064 }
4065 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4066 _nonstatic_oop_map_count = new_count;
4067 }
4068
4069 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4070 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4071 if (_nonstatic_oop_map_count > 0) {
4072 OopMapBlock* map = _nonstatic_oop_maps;
4073 OopMapBlock* last_map = last_oop_map();
4074 assert(map <= last_map, "Last less than first");
4075 while (map <= last_map) {
4076 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4077 map->offset() + map->offset_span() - heapOopSize, map->count());
4078 map++;
4079 }
4080 }
4081 }
4082
4083 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4084 print_on(st);
4085 }
4086
4087 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4088 assert(ik != nullptr, "invariant");
4089
4090 const InstanceKlass* const super = ik->java_super();
4091
4092 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4093 // in which case we don't have to register objects as finalizable
4094 if (!_has_empty_finalizer) {
4095 if (_has_finalizer ||
4096 (super != nullptr && super->has_finalizer())) {
4097 ik->set_has_finalizer();
4098 }
4099 }
4100
4101 #ifdef ASSERT
4102 bool f = false;
4103 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4104 vmSymbols::void_method_signature());
4105 if (InstanceKlass::is_finalization_enabled() &&
4106 (m != nullptr) && !m->is_empty_method()) {
4107 f = true;
4108 }
4109
4110 // Spec doesn't prevent agent from redefinition of empty finalizer.
4111 // Despite the fact that it's generally bad idea and redefined finalizer
4112 // will not work as expected we shouldn't abort vm in this case
4113 if (!ik->has_redefined_this_or_super()) {
4114 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4115 }
4116 #endif
4117
4118 // Check if this klass supports the java.lang.Cloneable interface
4119 if (vmClasses::Cloneable_klass_loaded()) {
4120 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4121 ik->set_is_cloneable();
4122 }
4123 }
4124
4125 // If it cannot be fast-path allocated, set a bit in the layout helper.
4126 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4127 assert(ik->size_helper() > 0, "layout_helper is initialized");
4128 if (ik->is_abstract() || ik->is_interface()
4129 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4130 || ik->size_helper() >= FastAllocateSizeLimit) {
4131 // Forbid fast-path allocation.
4132 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4133 ik->set_layout_helper(lh);
4134 }
4135 }
4136
4137 bool ClassFileParser::supports_inline_types() const {
4138 // Inline types are only supported by class file version 69.65535 and later
4139 return _major_version > JAVA_25_VERSION ||
4140 (_major_version == JAVA_25_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4141 }
4142
4143 // utility methods for appending an array with check for duplicates
4144
4145 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4146 const Array<InstanceKlass*>* const ifs) {
4147 // iterate over new interfaces
4148 for (int i = 0; i < ifs->length(); i++) {
4149 InstanceKlass* const e = ifs->at(i);
4150 assert(e->is_klass() && e->is_interface(), "just checking");
4151 // add new interface
4152 result->append_if_missing(e);
4153 }
4154 }
4155
4156 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4157 Array<InstanceKlass*>* local_ifs,
4158 ClassLoaderData* loader_data,
4159 TRAPS) {
4160 assert(local_ifs != nullptr, "invariant");
4161 assert(loader_data != nullptr, "invariant");
4162
4163 // Compute maximum size for transitive interfaces
4164 int max_transitive_size = 0;
4165 int super_size = 0;
4166 // Add superclass transitive interfaces size
4167 if (super != nullptr) {
4168 super_size = super->transitive_interfaces()->length();
4169 max_transitive_size += super_size;
4170 }
4171 // Add local interfaces' super interfaces
4172 const int local_size = local_ifs->length();
4173 for (int i = 0; i < local_size; i++) {
4174 InstanceKlass* const l = local_ifs->at(i);
4175 max_transitive_size += l->transitive_interfaces()->length();
4176 }
4177 // Finally add local interfaces
4178 max_transitive_size += local_size;
4179 // Construct array
4180 if (max_transitive_size == 0) {
4181 // no interfaces, use canonicalized array
4182 return Universe::the_empty_instance_klass_array();
4183 } else if (max_transitive_size == super_size) {
4184 // no new local interfaces added, share superklass' transitive interface array
4185 return super->transitive_interfaces();
4186 // The three lines below are commented to work around bug JDK-8245487
4187 // } else if (max_transitive_size == local_size) {
4188 // // only local interfaces added, share local interface array
4189 // return local_ifs;
4190 } else {
4191 ResourceMark rm;
4192 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4193
4194 // Copy down from superclass
4195 if (super != nullptr) {
4196 append_interfaces(result, super->transitive_interfaces());
4197 }
4198
4199 // Copy down from local interfaces' superinterfaces
4200 for (int i = 0; i < local_size; i++) {
4201 InstanceKlass* const l = local_ifs->at(i);
4202 append_interfaces(result, l->transitive_interfaces());
4203 }
4204 // Finally add local interfaces
4205 append_interfaces(result, local_ifs);
4206
4207 // length will be less than the max_transitive_size if duplicates were removed
4208 const int length = result->length();
4209 assert(length <= max_transitive_size, "just checking");
4210
4211 Array<InstanceKlass*>* const new_result =
4212 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4213 for (int i = 0; i < length; i++) {
4214 InstanceKlass* const e = result->at(i);
4215 assert(e != nullptr, "just checking");
4216 new_result->at_put(i, e);
4217 }
4218 return new_result;
4219 }
4220 }
4221
4222 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4223 assert(this_klass != nullptr, "invariant");
4224 const Klass* const super = this_klass->super();
4225
4226 if (super != nullptr) {
4227 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4228
4229 if (super->is_final()) {
4230 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4231 return;
4232 }
4233
4234 if (super_ik->is_sealed()) {
4235 stringStream ss;
4236 ResourceMark rm(THREAD);
4237 if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
4238 classfile_icce_error(ss.as_string(), THREAD);
4239 return;
4240 }
4241 }
4242
4243 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4244 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4245 // for a value classes. So, it is treated as a special case for now.
4246 if (!this_klass->access_flags().is_identity_class() &&
4247 super_ik->name() != vmSymbols::java_lang_Object() &&
4248 super_ik->is_identity_class()) {
4249 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4250 return;
4251 }
4252
4253 Reflection::VerifyClassAccessResults vca_result =
4254 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4255 if (vca_result != Reflection::ACCESS_OK) {
4256 ResourceMark rm(THREAD);
4257 char* msg = Reflection::verify_class_access_msg(this_klass,
4258 InstanceKlass::cast(super),
4259 vca_result);
4260
4261 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4262 if (msg == nullptr) {
4263 bool same_module = (this_klass->module() == super->module());
4264 Exceptions::fthrow(
4265 THREAD_AND_LOCATION,
4266 vmSymbols::java_lang_IllegalAccessError(),
4267 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4268 this_klass->external_name(),
4269 super->is_abstract() ? "abstract " : "",
4270 super->external_name(),
4271 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4272 (same_module) ? "" : "; ",
4273 (same_module) ? "" : super->class_in_module_of_loader());
4274 } else {
4275 // Add additional message content.
4276 Exceptions::fthrow(
4277 THREAD_AND_LOCATION,
4278 vmSymbols::java_lang_IllegalAccessError(),
4279 "superclass access check failed: %s",
4280 msg);
4281 }
4282 }
4283 }
4284 }
4285
4286
4287 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4288 assert(this_klass != nullptr, "invariant");
4289 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4290 const int lng = local_interfaces->length();
4291 for (int i = lng - 1; i >= 0; i--) {
4292 InstanceKlass* const k = local_interfaces->at(i);
4293 assert (k != nullptr && k->is_interface(), "invalid interface");
4294
4295 if (k->is_sealed()) {
4296 stringStream ss;
4297 ResourceMark rm(THREAD);
4298 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4299 classfile_icce_error(ss.as_string(), THREAD);
4300 return;
4301 }
4302 }
4303
4304 Reflection::VerifyClassAccessResults vca_result =
4305 Reflection::verify_class_access(this_klass, k, false);
4306 if (vca_result != Reflection::ACCESS_OK) {
4307 ResourceMark rm(THREAD);
4308 char* msg = Reflection::verify_class_access_msg(this_klass,
4309 k,
4310 vca_result);
4311
4312 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4313 if (msg == nullptr) {
4314 bool same_module = (this_klass->module() == k->module());
4315 Exceptions::fthrow(
4316 THREAD_AND_LOCATION,
4317 vmSymbols::java_lang_IllegalAccessError(),
4318 "class %s cannot access its superinterface %s (%s%s%s)",
4319 this_klass->external_name(),
4320 k->external_name(),
4321 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4322 (same_module) ? "" : "; ",
4323 (same_module) ? "" : k->class_in_module_of_loader());
4324 return;
4325 } else {
4326 // Add additional message content.
4327 Exceptions::fthrow(
4328 THREAD_AND_LOCATION,
4329 vmSymbols::java_lang_IllegalAccessError(),
4330 "superinterface check failed: %s",
4331 msg);
4332 return;
4333 }
4334 }
4335 }
4336 }
4337
4338
4339 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4340 assert(this_klass != nullptr, "invariant");
4341 const Array<Method*>* const methods = this_klass->methods();
4342 const int num_methods = methods->length();
4343
4344 // go thru each method and check if it overrides a final method
4345 for (int index = 0; index < num_methods; index++) {
4346 const Method* const m = methods->at(index);
4347
4348 // skip private, static, and <init> methods
4349 if ((!m->is_private() && !m->is_static()) &&
4350 (m->name() != vmSymbols::object_initializer_name())) {
4351
4352 const Symbol* const name = m->name();
4353 const Symbol* const signature = m->signature();
4354 const InstanceKlass* k = this_klass->java_super();
4355 const Method* super_m = nullptr;
4356 while (k != nullptr) {
4357 // skip supers that don't have final methods.
4358 if (k->has_final_method()) {
4359 // lookup a matching method in the super class hierarchy
4360 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4361 if (super_m == nullptr) {
4362 break; // didn't find any match; get out
4363 }
4364
4365 if (super_m->is_final() && !super_m->is_static() &&
4366 !super_m->access_flags().is_private()) {
4367 // matching method in super is final, and not static or private
4368 bool can_access = Reflection::verify_member_access(this_klass,
4369 super_m->method_holder(),
4370 super_m->method_holder(),
4371 super_m->access_flags(),
4372 false, false, CHECK);
4373 if (can_access) {
4374 // this class can access super final method and therefore override
4375 ResourceMark rm(THREAD);
4376 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4377 err_msg("class %s overrides final method %s.%s%s",
4378 this_klass->external_name(),
4379 super_m->method_holder()->external_name(),
4380 name->as_C_string(),
4381 signature->as_C_string()));
4382 }
4383 }
4384
4385 // continue to look from super_m's holder's super.
4386 k = super_m->method_holder()->java_super();
4387 continue;
4388 }
4389
4390 k = k->java_super();
4391 }
4392 }
4393 }
4394 }
4395
4396
4397 // assumes that this_klass is an interface
4398 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4399 assert(this_klass != nullptr, "invariant");
4400 assert(this_klass->is_interface(), "not an interface");
4401 const Array<Method*>* methods = this_klass->methods();
4402 const int num_methods = methods->length();
4403
4404 for (int index = 0; index < num_methods; index++) {
4405 const Method* const m = methods->at(index);
4406 // if m is static and not the init method, throw a verify error
4407 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4408 ResourceMark rm(THREAD);
4409
4410 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4411 Exceptions::fthrow(
4412 THREAD_AND_LOCATION,
4413 vmSymbols::java_lang_VerifyError(),
4414 "Illegal static method %s in interface %s",
4415 m->name()->as_C_string(),
4416 this_klass->external_name()
4417 );
4418 return;
4419 }
4420 }
4421 }
4422
4423 // utility methods for format checking
4424
4425 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4426 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4427 const bool is_inner_class = name != nullptr;
4428 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4429 if (is_module) {
4430 ResourceMark rm(THREAD);
4431 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4432 Exceptions::fthrow(
4433 THREAD_AND_LOCATION,
4434 vmSymbols::java_lang_NoClassDefFoundError(),
4435 "%s is not a class because access_flag ACC_MODULE is set",
4436 _class_name->as_C_string());
4437 return;
4438 }
4439
4440 if (!_need_verify) { return; }
4441
4442 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4443 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4444 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4445 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4446 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4447 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4448 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4449 const bool valid_value_class = is_identity || is_interface ||
4450 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4451
4452 if ((is_abstract && is_final) ||
4453 (is_interface && !is_abstract) ||
4454 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4455 (!is_interface && major_gte_1_5 && is_annotation) ||
4456 (!valid_value_class)) {
4457 ResourceMark rm(THREAD);
4458 const char* class_note = "";
4459 if (!valid_value_class) {
4460 class_note = " (a value class must be final or else abstract)";
4461 }
4462 if (name == nullptr) { // Not an inner class
4463 Exceptions::fthrow(
4464 THREAD_AND_LOCATION,
4465 vmSymbols::java_lang_ClassFormatError(),
4466 "Illegal class modifiers in class %s%s: 0x%X",
4467 _class_name->as_C_string(), class_note, flags
4468 );
4469 return;
4470 } else {
4471 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4472 Exceptions::fthrow(
4473 THREAD_AND_LOCATION,
4474 vmSymbols::java_lang_ClassFormatError(),
4475 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4476 name, class_note, _class_name->as_C_string(), flags
4477 );
4478 return;
4479 }
4480 }
4481 }
4482
4483 static bool has_illegal_visibility(jint flags) {
4484 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4485 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4486 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4487
4488 return ((is_public && is_protected) ||
4489 (is_public && is_private) ||
4490 (is_protected && is_private));
4491 }
4492
4493 // A legal major_version.minor_version must be one of the following:
4494 //
4495 // Major_version >= 45 and major_version < 56, any minor_version.
4496 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4497 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4498 //
4499 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4500 ResourceMark rm(THREAD);
4501 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4502 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4503 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4504 class_name, major, minor, THREAD);
4505 return;
4506 }
4507
4508 if (major > max_version) {
4509 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4510 Exceptions::fthrow(
4511 THREAD_AND_LOCATION,
4512 vmSymbols::java_lang_UnsupportedClassVersionError(),
4513 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4514 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4515 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4516 return;
4517 }
4518
4519 if (major < JAVA_12_VERSION || minor == 0) {
4520 return;
4521 }
4522
4523 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4524 if (major != max_version) {
4525 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4526 Exceptions::fthrow(
4527 THREAD_AND_LOCATION,
4528 vmSymbols::java_lang_UnsupportedClassVersionError(),
4529 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4530 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4531 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4532 return;
4533 }
4534
4535 if (!Arguments::enable_preview()) {
4536 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4537 class_name, major, minor, THREAD);
4538 return;
4539 }
4540
4541 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4542 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4543 class_name, major, minor, THREAD);
4544 }
4545 }
4546
4547 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4548 AccessFlags class_access_flags,
4549 TRAPS) const {
4550 if (!_need_verify) { return; }
4551
4552 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4553 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4554 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4555 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4556 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4557 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4558 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4559 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4560 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4561 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4562
4563 const bool is_interface = class_access_flags.is_interface();
4564 const bool is_identity_class = class_access_flags.is_identity_class();
4565
4566 bool is_illegal = false;
4567 const char* error_msg = "";
4568
4569 // There is some overlap in the checks that apply, for example interface fields
4570 // must be static, static fields can't be strict, and therefore interfaces can't
4571 // have strict fields. So we don't have to check every possible invalid combination
4572 // individually as long as all are covered. Once we have found an illegal combination
4573 // we can stop checking.
4574
4575 if (!is_illegal) {
4576 if (is_interface) {
4577 if (!is_public || !is_static || !is_final || is_private ||
4578 is_protected || is_volatile || is_transient ||
4579 (major_gte_1_5 && is_enum)) {
4580 is_illegal = true;
4581 error_msg = "interface fields must be public, static and final, and may be synthetic";
4582 }
4583 } else { // not interface
4584 if (has_illegal_visibility(flags)) {
4585 is_illegal = true;
4586 error_msg = "invalid visibility flags for class field";
4587 } else if (is_final && is_volatile) {
4588 is_illegal = true;
4589 error_msg = "fields cannot be final and volatile";
4590 } else if (supports_inline_types()) {
4591 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4592 is_illegal = true;
4593 error_msg = "value class fields must be either non-static final and strict, or static";
4594 }
4595 }
4596 }
4597 }
4598
4599 if (is_illegal) {
4600 ResourceMark rm(THREAD);
4601 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4602 Exceptions::fthrow(
4603 THREAD_AND_LOCATION,
4604 vmSymbols::java_lang_ClassFormatError(),
4605 "Illegal field modifiers (%s) in class %s: 0x%X",
4606 error_msg, _class_name->as_C_string(), flags);
4607 return;
4608 }
4609 }
4610
4611 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4612 AccessFlags class_access_flags,
4613 const Symbol* name,
4614 TRAPS) const {
4615 if (!_need_verify) { return; }
4616
4617 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4618 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4619 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4620 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4621 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4622 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4623 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4624 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4625 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4626 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4627 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4628 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4629 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4630 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4631 // LW401 CR required: removal of value factories support
4632 const bool is_interface = class_access_flags.is_interface();
4633 const bool is_identity_class = class_access_flags.is_identity_class();
4634 const bool is_abstract_class = class_access_flags.is_abstract();
4635
4636 bool is_illegal = false;
4637
4638 const char* class_note = "";
4639 if (is_interface) {
4640 if (major_gte_8) {
4641 // Class file version is JAVA_8_VERSION or later Methods of
4642 // interfaces may set any of the flags except ACC_PROTECTED,
4643 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4644 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4645 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4646 (is_native || is_protected || is_final || is_synchronized) ||
4647 // If a specific method of a class or interface has its
4648 // ACC_ABSTRACT flag set, it must not have any of its
4649 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4650 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4651 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4652 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4653 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4654 is_illegal = true;
4655 }
4656 } else if (major_gte_1_5) {
4657 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4658 if (!is_public || is_private || is_protected || is_static || is_final ||
4659 is_synchronized || is_native || !is_abstract || is_strict) {
4660 is_illegal = true;
4661 }
4662 } else {
4663 // Class file version is pre-JAVA_1_5_VERSION
4664 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4665 is_illegal = true;
4666 }
4667 }
4668 } else { // not interface
4669 if (has_illegal_visibility(flags)) {
4670 is_illegal = true;
4671 } else {
4672 if (is_initializer) {
4673 if (is_static || is_final || is_synchronized || is_native ||
4674 is_abstract || (major_gte_1_5 && is_bridge)) {
4675 is_illegal = true;
4676 }
4677 } else { // not initializer
4678 if (!is_identity_class && is_synchronized && !is_static) {
4679 is_illegal = true;
4680 class_note = " (not an identity class)";
4681 } else {
4682 if (is_abstract) {
4683 if ((is_final || is_native || is_private || is_static ||
4684 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4685 is_illegal = true;
4686 }
4687 }
4688 }
4689 }
4690 }
4691 }
4692
4693 if (is_illegal) {
4694 ResourceMark rm(THREAD);
4695 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4696 Exceptions::fthrow(
4697 THREAD_AND_LOCATION,
4698 vmSymbols::java_lang_ClassFormatError(),
4699 "Method %s in class %s%s has illegal modifiers: 0x%X",
4700 name->as_C_string(), _class_name->as_C_string(),
4701 class_note, flags);
4702 return;
4703 }
4704 }
4705
4706 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4707 int length,
4708 TRAPS) const {
4709 assert(_need_verify, "only called when _need_verify is true");
4710 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4711 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4712 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4713 }
4714 }
4715
4716 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4717 // In class names, '/' separates unqualified names. This is verified in this function also.
4718 // Method names also may not contain the characters '<' or '>', unless <init>
4719 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4720 // method. Because these names have been checked as special cases before
4721 // calling this method in verify_legal_method_name.
4722 //
4723 // This method is also called from the modular system APIs in modules.cpp
4724 // to verify the validity of module and package names.
4725 bool ClassFileParser::verify_unqualified_name(const char* name,
4726 unsigned int length,
4727 int type) {
4728 if (length == 0) return false; // Must have at least one char.
4729 for (const char* p = name; p != name + length; p++) {
4730 switch(*p) {
4731 case JVM_SIGNATURE_DOT:
4732 case JVM_SIGNATURE_ENDCLASS:
4733 case JVM_SIGNATURE_ARRAY:
4734 // do not permit '.', ';', or '['
4735 return false;
4736 case JVM_SIGNATURE_SLASH:
4737 // check for '//' or leading or trailing '/' which are not legal
4738 // unqualified name must not be empty
4739 if (type == ClassFileParser::LegalClass) {
4740 if (p == name || p+1 >= name+length ||
4741 *(p+1) == JVM_SIGNATURE_SLASH) {
4742 return false;
4743 }
4744 } else {
4745 return false; // do not permit '/' unless it's class name
4746 }
4747 break;
4748 case JVM_SIGNATURE_SPECIAL:
4749 case JVM_SIGNATURE_ENDSPECIAL:
4750 // do not permit '<' or '>' in method names
4751 if (type == ClassFileParser::LegalMethod) {
4752 return false;
4753 }
4754 }
4755 }
4756 return true;
4757 }
4758
4759 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4760 if (_loadable_descriptors == nullptr) return false;
4761 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4762 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4763 if (class_name == klass) return true;
4764 }
4765 return false;
4766 }
4767
4768 // Take pointer to a UTF8 byte string (not NUL-terminated).
4769 // Skip over the longest part of the string that could
4770 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4771 // Return a pointer to just past the fieldname.
4772 // Return null if no fieldname at all was found, or in the case of slash_ok
4773 // being true, we saw consecutive slashes (meaning we were looking for a
4774 // qualified path but found something that was badly-formed).
4775 static const char* skip_over_field_name(const char* const name,
4776 bool slash_ok,
4777 unsigned int length) {
4778 const char* p;
4779 jboolean last_is_slash = false;
4780 jboolean not_first_ch = false;
4781
4782 for (p = name; p != name + length; not_first_ch = true) {
4783 const char* old_p = p;
4784 jchar ch = *p;
4785 if (ch < 128) {
4786 p++;
4787 // quick check for ascii
4788 if ((ch >= 'a' && ch <= 'z') ||
4789 (ch >= 'A' && ch <= 'Z') ||
4790 (ch == '_' || ch == '$') ||
4791 (not_first_ch && ch >= '0' && ch <= '9')) {
4792 last_is_slash = false;
4793 continue;
4794 }
4795 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4796 if (last_is_slash) {
4797 return nullptr; // Don't permit consecutive slashes
4798 }
4799 last_is_slash = true;
4800 continue;
4801 }
4802 }
4803 else {
4804 jint unicode_ch;
4805 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4806 p = tmp_p;
4807 last_is_slash = false;
4808 // Check if ch is Java identifier start or is Java identifier part
4809 // 4672820: call java.lang.Character methods directly without generating separate tables.
4810 EXCEPTION_MARK;
4811 // return value
4812 JavaValue result(T_BOOLEAN);
4813 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4814 JavaCallArguments args;
4815 args.push_int(unicode_ch);
4816
4817 if (not_first_ch) {
4818 // public static boolean isJavaIdentifierPart(char ch);
4819 JavaCalls::call_static(&result,
4820 vmClasses::Character_klass(),
4821 vmSymbols::isJavaIdentifierPart_name(),
4822 vmSymbols::int_bool_signature(),
4823 &args,
4824 THREAD);
4825 } else {
4826 // public static boolean isJavaIdentifierStart(char ch);
4827 JavaCalls::call_static(&result,
4828 vmClasses::Character_klass(),
4829 vmSymbols::isJavaIdentifierStart_name(),
4830 vmSymbols::int_bool_signature(),
4831 &args,
4832 THREAD);
4833 }
4834 if (HAS_PENDING_EXCEPTION) {
4835 CLEAR_PENDING_EXCEPTION;
4836 return nullptr;
4837 }
4838 if(result.get_jboolean()) {
4839 continue;
4840 }
4841 }
4842 return (not_first_ch) ? old_p : nullptr;
4843 }
4844 return (not_first_ch && !last_is_slash) ? p : nullptr;
4845 }
4846
4847 // Take pointer to a UTF8 byte string (not NUL-terminated).
4848 // Skip over the longest part of the string that could
4849 // be taken as a field signature. Allow "void" if void_ok.
4850 // Return a pointer to just past the signature.
4851 // Return null if no legal signature is found.
4852 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4853 bool void_ok,
4854 unsigned int length,
4855 TRAPS) const {
4856 unsigned int array_dim = 0;
4857 while (length > 0) {
4858 switch (signature[0]) {
4859 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4860 case JVM_SIGNATURE_BOOLEAN:
4861 case JVM_SIGNATURE_BYTE:
4862 case JVM_SIGNATURE_CHAR:
4863 case JVM_SIGNATURE_SHORT:
4864 case JVM_SIGNATURE_INT:
4865 case JVM_SIGNATURE_FLOAT:
4866 case JVM_SIGNATURE_LONG:
4867 case JVM_SIGNATURE_DOUBLE:
4868 return signature + 1;
4869 case JVM_SIGNATURE_CLASS:
4870 {
4871 if (_major_version < JAVA_1_5_VERSION) {
4872 // Skip over the class name if one is there
4873 const char* const p = skip_over_field_name(signature + 1, true, --length);
4874
4875 // The next character better be a semicolon
4876 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4877 return p + 1;
4878 }
4879 }
4880 else {
4881 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4882 signature++;
4883 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4884 // Format check signature
4885 if (c != nullptr) {
4886 int newlen = pointer_delta_as_int(c, (char*) signature);
4887 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4888 if (!legal) {
4889 classfile_parse_error("Class name is empty or contains illegal character "
4890 "in descriptor in class file %s",
4891 THREAD);
4892 return nullptr;
4893 }
4894 return signature + newlen + 1;
4895 }
4896 }
4897 return nullptr;
4898 }
4899 case JVM_SIGNATURE_ARRAY:
4900 array_dim++;
4901 if (array_dim > 255) {
4902 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4903 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4904 return nullptr;
4905 }
4906 // The rest of what's there better be a legal signature
4907 signature++;
4908 length--;
4909 void_ok = false;
4910 break;
4911 default:
4912 return nullptr;
4913 }
4914 }
4915 return nullptr;
4916 }
4917
4918 // Checks if name is a legal class name.
4919 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4920 if (!_need_verify) { return; }
4921
4922 assert(name->refcount() > 0, "symbol must be kept alive");
4923 char* bytes = (char*)name->bytes();
4924 unsigned int length = name->utf8_length();
4925 bool legal = false;
4926
4927 if (length > 0) {
4928 const char* p;
4929 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4930 p = skip_over_field_signature(bytes, false, length, CHECK);
4931 legal = (p != nullptr) && ((p - bytes) == (int)length);
4932 } else if (_major_version < JAVA_1_5_VERSION) {
4933 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4934 p = skip_over_field_name(bytes, true, length);
4935 legal = (p != nullptr) && ((p - bytes) == (int)length);
4936 }
4937 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4938 && bytes[length - 1] == ';' ) {
4939 // Support for L...; descriptors
4940 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4941 } else {
4942 // 4900761: relax the constraints based on JSR202 spec
4943 // Class names may be drawn from the entire Unicode character set.
4944 // Identifiers between '/' must be unqualified names.
4945 // The utf8 string has been verified when parsing cpool entries.
4946 legal = verify_unqualified_name(bytes, length, LegalClass);
4947 }
4948 }
4949 if (!legal) {
4950 ResourceMark rm(THREAD);
4951 assert(_class_name != nullptr, "invariant");
4952 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4953 Exceptions::fthrow(
4954 THREAD_AND_LOCATION,
4955 vmSymbols::java_lang_ClassFormatError(),
4956 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4957 _class_name->as_C_string()
4958 );
4959 return;
4960 }
4961 }
4962
4963 // Checks if name is a legal field name.
4964 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4965 if (!_need_verify) { return; }
4966
4967 char* bytes = (char*)name->bytes();
4968 unsigned int length = name->utf8_length();
4969 bool legal = false;
4970
4971 if (length > 0) {
4972 if (_major_version < JAVA_1_5_VERSION) {
4973 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4974 const char* p = skip_over_field_name(bytes, false, length);
4975 legal = (p != nullptr) && ((p - bytes) == (int)length);
4976 }
4977 } else {
4978 // 4881221: relax the constraints based on JSR202 spec
4979 legal = verify_unqualified_name(bytes, length, LegalField);
4980 }
4981 }
4982
4983 if (!legal) {
4984 ResourceMark rm(THREAD);
4985 assert(_class_name != nullptr, "invariant");
4986 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4987 Exceptions::fthrow(
4988 THREAD_AND_LOCATION,
4989 vmSymbols::java_lang_ClassFormatError(),
4990 "Illegal field name \"%.*s\" in class %s", length, bytes,
4991 _class_name->as_C_string()
4992 );
4993 return;
4994 }
4995 }
4996
4997 // Checks if name is a legal method name.
4998 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4999 if (!_need_verify) { return; }
5000
5001 assert(name != nullptr, "method name is null");
5002 char* bytes = (char*)name->bytes();
5003 unsigned int length = name->utf8_length();
5004 bool legal = false;
5005
5006 if (length > 0) {
5007 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5008 if (name == vmSymbols::object_initializer_name() ||
5009 name == vmSymbols::class_initializer_name()) {
5010 legal = true;
5011 }
5012 } else if (_major_version < JAVA_1_5_VERSION) {
5013 const char* p;
5014 p = skip_over_field_name(bytes, false, length);
5015 legal = (p != nullptr) && ((p - bytes) == (int)length);
5016 } else {
5017 // 4881221: relax the constraints based on JSR202 spec
5018 legal = verify_unqualified_name(bytes, length, LegalMethod);
5019 }
5020 }
5021
5022 if (!legal) {
5023 ResourceMark rm(THREAD);
5024 assert(_class_name != nullptr, "invariant");
5025 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5026 Exceptions::fthrow(
5027 THREAD_AND_LOCATION,
5028 vmSymbols::java_lang_ClassFormatError(),
5029 "Illegal method name \"%.*s\" in class %s", length, bytes,
5030 _class_name->as_C_string()
5031 );
5032 return;
5033 }
5034 }
5035
5036 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5037 const char* const bytes = (const char*)signature->bytes();
5038 const unsigned int length = signature->utf8_length();
5039 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5040
5041 if (p == nullptr || (p - bytes) != (int)length) {
5042 return false;
5043 }
5044 return true;
5045 }
5046
5047 // Checks if signature is a legal field signature.
5048 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5049 const Symbol* signature,
5050 TRAPS) const {
5051 if (!_need_verify) { return; }
5052
5053 const char* const bytes = (const char*)signature->bytes();
5054 const unsigned int length = signature->utf8_length();
5055 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5056
5057 if (p == nullptr || (p - bytes) != (int)length) {
5058 throwIllegalSignature("Field", name, signature, CHECK);
5059 }
5060 }
5061
5062 // Check that the signature is compatible with the method name. For example,
5063 // check that <init> has a void signature.
5064 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5065 const Symbol* signature,
5066 TRAPS) const {
5067 if (!_need_verify) {
5068 return;
5069 }
5070
5071 // Class initializers cannot have args for class format version >= 51.
5072 if (name == vmSymbols::class_initializer_name() &&
5073 signature != vmSymbols::void_method_signature() &&
5074 _major_version >= JAVA_7_VERSION) {
5075 throwIllegalSignature("Method", name, signature, THREAD);
5076 return;
5077 }
5078
5079 int sig_length = signature->utf8_length();
5080 if (name->utf8_length() > 0 &&
5081 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5082 sig_length > 0 &&
5083 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5084 throwIllegalSignature("Method", name, signature, THREAD);
5085 }
5086 }
5087
5088 // Checks if signature is a legal method signature.
5089 // Returns number of parameters
5090 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5091 const Symbol* signature,
5092 TRAPS) const {
5093 if (!_need_verify) {
5094 // make sure caller's args_size will be less than 0 even for non-static
5095 // method so it will be recomputed in compute_size_of_parameters().
5096 return -2;
5097 }
5098
5099 unsigned int args_size = 0;
5100 const char* p = (const char*)signature->bytes();
5101 unsigned int length = signature->utf8_length();
5102 const char* nextp;
5103
5104 // The first character must be a '('
5105 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5106 length--;
5107 // Skip over legal field signatures
5108 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5109 while ((length > 0) && (nextp != nullptr)) {
5110 args_size++;
5111 if (p[0] == 'J' || p[0] == 'D') {
5112 args_size++;
5113 }
5114 length -= pointer_delta_as_int(nextp, p);
5115 p = nextp;
5116 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5117 }
5118 // The first non-signature thing better be a ')'
5119 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5120 length--;
5121 // Now we better just have a return value
5122 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5123 if (nextp && ((int)length == (nextp - p))) {
5124 return args_size;
5125 }
5126 }
5127 }
5128 // Report error
5129 throwIllegalSignature("Method", name, signature, THREAD);
5130 return 0;
5131 }
5132
5133 int ClassFileParser::static_field_size() const {
5134 assert(_layout_info != nullptr, "invariant");
5135 return _layout_info->_static_field_size;
5136 }
5137
5138 int ClassFileParser::total_oop_map_count() const {
5139 assert(_layout_info != nullptr, "invariant");
5140 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5141 }
5142
5143 jint ClassFileParser::layout_size() const {
5144 assert(_layout_info != nullptr, "invariant");
5145 return _layout_info->_instance_size;
5146 }
5147
5148 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5149 const Array<Method*>* methods) {
5150 assert(ik != nullptr, "invariant");
5151 assert(methods != nullptr, "invariant");
5152
5153 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5154 // (We used to do this lazily, but now we query it in Rewriter,
5155 // which is eagerly done for every method, so we might as well do it now,
5156 // when everything is fresh in memory.)
5157 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5158
5159 if (klass_id != vmSymbolID::NO_SID) {
5160 for (int j = 0; j < methods->length(); ++j) {
5161 Method* method = methods->at(j);
5162 method->init_intrinsic_id(klass_id);
5163
5164 if (CheckIntrinsics) {
5165 // Check if an intrinsic is defined for method 'method',
5166 // but the method is not annotated with @IntrinsicCandidate.
5167 if (method->intrinsic_id() != vmIntrinsics::_none &&
5168 !method->intrinsic_candidate()) {
5169 tty->print("Compiler intrinsic is defined for method [%s], "
5170 "but the method is not annotated with @IntrinsicCandidate.%s",
5171 method->name_and_sig_as_C_string(),
5172 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5173 );
5174 tty->cr();
5175 DEBUG_ONLY(vm_exit(1));
5176 }
5177 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5178 // but there is no intrinsic available for it.
5179 if (method->intrinsic_candidate() &&
5180 method->intrinsic_id() == vmIntrinsics::_none) {
5181 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5182 "but no compiler intrinsic is defined for the method.%s",
5183 method->name_and_sig_as_C_string(),
5184 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5185 );
5186 tty->cr();
5187 DEBUG_ONLY(vm_exit(1));
5188 }
5189 }
5190 } // end for
5191
5192 #ifdef ASSERT
5193 if (CheckIntrinsics) {
5194 // Check for orphan methods in the current class. A method m
5195 // of a class C is orphan if an intrinsic is defined for method m,
5196 // but class C does not declare m.
5197 // The check is potentially expensive, therefore it is available
5198 // only in debug builds.
5199
5200 for (auto id : EnumRange<vmIntrinsicID>{}) {
5201 if (vmIntrinsics::_compiledLambdaForm == id) {
5202 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5203 // generated for the JVM from a LambdaForm and therefore no method
5204 // is defined for it.
5205 continue;
5206 }
5207 if (vmIntrinsics::_blackhole == id) {
5208 // The _blackhole intrinsic is a special marker. No explicit method
5209 // is defined for it.
5210 continue;
5211 }
5212
5213 if (vmIntrinsics::class_for(id) == klass_id) {
5214 // Check if the current class contains a method with the same
5215 // name, flags, signature.
5216 bool match = false;
5217 for (int j = 0; j < methods->length(); ++j) {
5218 const Method* method = methods->at(j);
5219 if (method->intrinsic_id() == id) {
5220 match = true;
5221 break;
5222 }
5223 }
5224
5225 if (!match) {
5226 char buf[1000];
5227 tty->print("Compiler intrinsic is defined for method [%s], "
5228 "but the method is not available in class [%s].%s",
5229 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5230 ik->name()->as_C_string(),
5231 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5232 );
5233 tty->cr();
5234 DEBUG_ONLY(vm_exit(1));
5235 }
5236 }
5237 } // end for
5238 } // CheckIntrinsics
5239 #endif // ASSERT
5240 }
5241 }
5242
5243 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5244 const ClassInstanceInfo& cl_inst_info,
5245 TRAPS) {
5246 if (_klass != nullptr) {
5247 return _klass;
5248 }
5249
5250 InstanceKlass* const ik =
5251 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5252
5253 if (is_hidden()) {
5254 mangle_hidden_class_name(ik);
5255 }
5256
5257 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5258
5259 assert(_klass == ik, "invariant");
5260 return ik;
5261 }
5262
5263 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5264 bool changed_by_loadhook,
5265 const ClassInstanceInfo& cl_inst_info,
5266 TRAPS) {
5267 assert(ik != nullptr, "invariant");
5268
5269 // Set name and CLD before adding to CLD
5270 ik->set_class_loader_data(_loader_data);
5271 ik->set_name(_class_name);
5272
5273 // Add all classes to our internal class loader list here,
5274 // including classes in the bootstrap (null) class loader.
5275 const bool publicize = !is_internal();
5276
5277 _loader_data->add_class(ik, publicize);
5278
5279 set_klass_to_deallocate(ik);
5280
5281 assert(_layout_info != nullptr, "invariant");
5282 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5283 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5284 "sanity");
5285
5286 assert(ik->is_instance_klass(), "sanity");
5287 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5288
5289 // Fill in information already parsed
5290 ik->set_should_verify_class(_need_verify);
5291
5292 // Not yet: supers are done below to support the new subtype-checking fields
5293 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5294 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5295 ik->set_has_strict_static_fields(_has_strict_static_fields);
5296
5297 if (_layout_info->_is_naturally_atomic) {
5298 ik->set_is_naturally_atomic();
5299 }
5300
5301 if (_layout_info->_must_be_atomic) {
5302 ik->set_must_be_atomic();
5303 }
5304
5305 ik->set_static_oop_field_count(_static_oop_count);
5306
5307 // this transfers ownership of a lot of arrays from
5308 // the parser onto the InstanceKlass*
5309 apply_parsed_class_metadata(ik, _java_fields_count);
5310 if (ik->is_inline_klass()) {
5311 InlineKlass::cast(ik)->init_fixed_block();
5312 }
5313
5314 // can only set dynamic nest-host after static nest information is set
5315 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5316 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5317 }
5318
5319 // note that is not safe to use the fields in the parser from this point on
5320 assert(nullptr == _cp, "invariant");
5321 assert(nullptr == _fieldinfo_stream, "invariant");
5322 assert(nullptr == _fields_status, "invariant");
5323 assert(nullptr == _methods, "invariant");
5324 assert(nullptr == _inner_classes, "invariant");
5325 assert(nullptr == _nest_members, "invariant");
5326 assert(nullptr == _loadable_descriptors, "invariant");
5327 assert(nullptr == _combined_annotations, "invariant");
5328 assert(nullptr == _record_components, "invariant");
5329 assert(nullptr == _permitted_subclasses, "invariant");
5330 assert(nullptr == _inline_layout_info_array, "invariant");
5331
5332 if (_has_localvariable_table) {
5333 ik->set_has_localvariable_table(true);
5334 }
5335
5336 if (_has_final_method) {
5337 ik->set_has_final_method();
5338 }
5339
5340 ik->copy_method_ordering(_method_ordering, CHECK);
5341 // The InstanceKlass::_methods_jmethod_ids cache
5342 // is managed on the assumption that the initial cache
5343 // size is equal to the number of methods in the class. If
5344 // that changes, then InstanceKlass::idnum_can_increment()
5345 // has to be changed accordingly.
5346 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5347
5348 ik->set_this_class_index(_this_class_index);
5349
5350 if (_is_hidden) {
5351 // _this_class_index is a CONSTANT_Class entry that refers to this
5352 // hidden class itself. If this class needs to refer to its own methods
5353 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5354 // _this_class_index. However, because this class is hidden (it's
5355 // not stored in SystemDictionary), _this_class_index cannot be resolved
5356 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5357 // Therefore, we must eagerly resolve _this_class_index now.
5358 ik->constants()->klass_at_put(_this_class_index, ik);
5359 }
5360
5361 ik->set_minor_version(_minor_version);
5362 ik->set_major_version(_major_version);
5363 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5364 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5365
5366 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5367
5368 // Set PackageEntry for this_klass
5369 oop cl = ik->class_loader();
5370 Handle clh = Handle(THREAD, cl);
5371 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5372 ik->set_package(cld, nullptr, CHECK);
5373
5374 const Array<Method*>* const methods = ik->methods();
5375 assert(methods != nullptr, "invariant");
5376 const int methods_len = methods->length();
5377
5378 check_methods_for_intrinsics(ik, methods);
5379
5380 // Fill in field values obtained by parse_classfile_attributes
5381 if (_parsed_annotations->has_any_annotations()) {
5382 _parsed_annotations->apply_to(ik);
5383 }
5384
5385 apply_parsed_class_attributes(ik);
5386
5387 // Miranda methods
5388 if ((_num_miranda_methods > 0) ||
5389 // if this class introduced new miranda methods or
5390 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5391 // super class exists and this class inherited miranda methods
5392 ) {
5393 ik->set_has_miranda_methods(); // then set a flag
5394 }
5395
5396 // Fill in information needed to compute superclasses.
5397 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5398 ik->set_transitive_interfaces(_transitive_interfaces);
5399 ik->set_local_interfaces(_local_interfaces);
5400 _transitive_interfaces = nullptr;
5401 _local_interfaces = nullptr;
5402
5403 // Initialize itable offset tables
5404 klassItable::setup_itable_offset_table(ik);
5405
5406 // Compute transitive closure of interfaces this class implements
5407 // Do final class setup
5408 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5409 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5410 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5411 }
5412
5413 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5414 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5415 ik->set_has_contended_annotations(true);
5416 }
5417
5418 // Fill in has_finalizer and layout_helper
5419 set_precomputed_flags(ik);
5420
5421 // check if this class can access its super class
5422 check_super_class_access(ik, CHECK);
5423
5424 // check if this class can access its superinterfaces
5425 check_super_interface_access(ik, CHECK);
5426
5427 // check if this class overrides any final method
5428 check_final_method_override(ik, CHECK);
5429
5430 // reject static interface methods prior to Java 8
5431 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5432 check_illegal_static_method(ik, CHECK);
5433 }
5434
5435 // Obtain this_klass' module entry
5436 ModuleEntry* module_entry = ik->module();
5437 assert(module_entry != nullptr, "module_entry should always be set");
5438
5439 // Obtain java.lang.Module
5440 Handle module_handle(THREAD, module_entry->module());
5441
5442 // Allocate mirror and initialize static fields
5443 java_lang_Class::create_mirror(ik,
5444 Handle(THREAD, _loader_data->class_loader()),
5445 module_handle,
5446 _protection_domain,
5447 cl_inst_info.class_data(),
5448 CHECK);
5449
5450 assert(_all_mirandas != nullptr, "invariant");
5451
5452 // Generate any default methods - default methods are public interface methods
5453 // that have a default implementation. This is new with Java 8.
5454 if (_has_nonstatic_concrete_methods) {
5455 DefaultMethods::generate_default_methods(ik,
5456 _all_mirandas,
5457 CHECK);
5458 }
5459
5460 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5461 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5462 !module_entry->has_default_read_edges()) {
5463 if (!module_entry->set_has_default_read_edges()) {
5464 // We won a potential race
5465 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5466 }
5467 }
5468
5469 if (is_inline_type()) {
5470 InlineKlass* vk = InlineKlass::cast(ik);
5471 vk->set_payload_alignment(_layout_info->_payload_alignment);
5472 vk->set_payload_offset(_layout_info->_payload_offset);
5473 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5474 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5475 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5476 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5477 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5478 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5479 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5480 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5481 vk->initialize_calling_convention(CHECK);
5482 }
5483
5484 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5485
5486 if (!is_internal()) {
5487 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5488
5489 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5490 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5491 log_is_enabled(Info, class, preview)) {
5492 ResourceMark rm;
5493 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5494 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5495 }
5496
5497 if (log_is_enabled(Debug, class, resolve)) {
5498 ResourceMark rm;
5499 // print out the superclass.
5500 const char * from = ik->external_name();
5501 if (ik->java_super() != nullptr) {
5502 log_debug(class, resolve)("%s %s (super)",
5503 from,
5504 ik->java_super()->external_name());
5505 }
5506 // print out each of the interface classes referred to by this class.
5507 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5508 if (local_interfaces != nullptr) {
5509 const int length = local_interfaces->length();
5510 for (int i = 0; i < length; i++) {
5511 const InstanceKlass* const k = local_interfaces->at(i);
5512 const char * to = k->external_name();
5513 log_debug(class, resolve)("%s %s (interface)", from, to);
5514 }
5515 }
5516 }
5517 }
5518
5519 JFR_ONLY(INIT_ID(ik);)
5520
5521 // If we reach here, all is well.
5522 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5523 // in order for it to not be destroyed in the ClassFileParser destructor.
5524 set_klass_to_deallocate(nullptr);
5525
5526 // it's official
5527 set_klass(ik);
5528
5529 DEBUG_ONLY(ik->verify();)
5530 }
5531
5532 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5533 // Decrement the refcount in the old name, since we're clobbering it.
5534 _class_name->decrement_refcount();
5535
5536 _class_name = new_class_name;
5537 // Increment the refcount of the new name.
5538 // Now the ClassFileParser owns this name and will decrement in
5539 // the destructor.
5540 _class_name->increment_refcount();
5541 }
5542
5543 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5544 Symbol* name,
5545 ClassLoaderData* loader_data,
5546 const ClassLoadInfo* cl_info,
5547 Publicity pub_level,
5548 TRAPS) :
5549 _stream(stream),
5550 _class_name(nullptr),
5551 _loader_data(loader_data),
5552 _is_hidden(cl_info->is_hidden()),
5553 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5554 _orig_cp_size(0),
5555 _static_oop_count(0),
5556 _super_klass(),
5557 _cp(nullptr),
5558 _fieldinfo_stream(nullptr),
5559 _fields_status(nullptr),
5560 _methods(nullptr),
5561 _inner_classes(nullptr),
5562 _nest_members(nullptr),
5563 _nest_host(0),
5564 _permitted_subclasses(nullptr),
5565 _loadable_descriptors(nullptr),
5566 _record_components(nullptr),
5567 _local_interfaces(nullptr),
5568 _local_interface_indexes(nullptr),
5569 _transitive_interfaces(nullptr),
5570 _combined_annotations(nullptr),
5571 _class_annotations(nullptr),
5572 _class_type_annotations(nullptr),
5573 _fields_annotations(nullptr),
5574 _fields_type_annotations(nullptr),
5575 _klass(nullptr),
5576 _klass_to_deallocate(nullptr),
5577 _parsed_annotations(nullptr),
5578 _layout_info(nullptr),
5579 _inline_layout_info_array(nullptr),
5580 _temp_field_info(nullptr),
5581 _method_ordering(nullptr),
5582 _all_mirandas(nullptr),
5583 _vtable_size(0),
5584 _itable_size(0),
5585 _num_miranda_methods(0),
5586 _protection_domain(cl_info->protection_domain()),
5587 _access_flags(),
5588 _pub_level(pub_level),
5589 _bad_constant_seen(0),
5590 _synthetic_flag(false),
5591 _sde_length(false),
5592 _sde_buffer(nullptr),
5593 _sourcefile_index(0),
5594 _generic_signature_index(0),
5595 _major_version(0),
5596 _minor_version(0),
5597 _this_class_index(0),
5598 _super_class_index(0),
5599 _itfs_len(0),
5600 _java_fields_count(0),
5601 _need_verify(false),
5602 _has_nonstatic_concrete_methods(false),
5603 _declares_nonstatic_concrete_methods(false),
5604 _has_localvariable_table(false),
5605 _has_final_method(false),
5606 _has_contended_fields(false),
5607 _has_strict_static_fields(false),
5608 _has_inline_type_fields(false),
5609 _is_naturally_atomic(false),
5610 _must_be_atomic(true),
5611 _has_loosely_consistent_annotation(false),
5612 _has_finalizer(false),
5613 _has_empty_finalizer(false),
5614 _max_bootstrap_specifier_index(-1) {
5615
5616 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5617 _class_name->increment_refcount();
5618
5619 assert(_loader_data != nullptr, "invariant");
5620 assert(stream != nullptr, "invariant");
5621 assert(_stream != nullptr, "invariant");
5622 assert(_stream->buffer() == _stream->current(), "invariant");
5623 assert(_class_name != nullptr, "invariant");
5624 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5625
5626 // Figure out whether we can skip format checking (matching classic VM behavior)
5627 // Always verify CFLH bytes from the user agents.
5628 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5629
5630 // synch back verification state to stream to check for truncation.
5631 stream->set_need_verify(_need_verify);
5632
5633 parse_stream(stream, CHECK);
5634
5635 post_process_parsed_stream(stream, _cp, CHECK);
5636 }
5637
5638 void ClassFileParser::clear_class_metadata() {
5639 // metadata created before the instance klass is created. Must be
5640 // deallocated if classfile parsing returns an error.
5641 _cp = nullptr;
5642 _fieldinfo_stream = nullptr;
5643 _fields_status = nullptr;
5644 _methods = nullptr;
5645 _inner_classes = nullptr;
5646 _nest_members = nullptr;
5647 _permitted_subclasses = nullptr;
5648 _loadable_descriptors = nullptr;
5649 _combined_annotations = nullptr;
5650 _class_annotations = _class_type_annotations = nullptr;
5651 _fields_annotations = _fields_type_annotations = nullptr;
5652 _record_components = nullptr;
5653 _inline_layout_info_array = nullptr;
5654 }
5655
5656 // Destructor to clean up
5657 ClassFileParser::~ClassFileParser() {
5658 _class_name->decrement_refcount();
5659
5660 if (_cp != nullptr) {
5661 MetadataFactory::free_metadata(_loader_data, _cp);
5662 }
5663
5664 if (_fieldinfo_stream != nullptr) {
5665 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5666 }
5667
5668 if (_fields_status != nullptr) {
5669 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5670 }
5671
5672 if (_inline_layout_info_array != nullptr) {
5673 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5674 }
5675
5676 if (_methods != nullptr) {
5677 // Free methods
5678 InstanceKlass::deallocate_methods(_loader_data, _methods);
5679 }
5680
5681 // beware of the Universe::empty_blah_array!!
5682 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5683 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5684 }
5685
5686 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5687 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5688 }
5689
5690 if (_record_components != nullptr) {
5691 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5692 }
5693
5694 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5695 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5696 }
5697
5698 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5699 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5700 }
5701
5702 // Free interfaces
5703 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5704 _local_interfaces, _transitive_interfaces);
5705
5706 if (_combined_annotations != nullptr) {
5707 // After all annotations arrays have been created, they are installed into the
5708 // Annotations object that will be assigned to the InstanceKlass being created.
5709
5710 // Deallocate the Annotations object and the installed annotations arrays.
5711 _combined_annotations->deallocate_contents(_loader_data);
5712
5713 // If the _combined_annotations pointer is non-null,
5714 // then the other annotations fields should have been cleared.
5715 assert(_class_annotations == nullptr, "Should have been cleared");
5716 assert(_class_type_annotations == nullptr, "Should have been cleared");
5717 assert(_fields_annotations == nullptr, "Should have been cleared");
5718 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5719 } else {
5720 // If the annotations arrays were not installed into the Annotations object,
5721 // then they have to be deallocated explicitly.
5722 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5723 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5724 Annotations::free_contents(_loader_data, _fields_annotations);
5725 Annotations::free_contents(_loader_data, _fields_type_annotations);
5726 }
5727
5728 clear_class_metadata();
5729 _transitive_interfaces = nullptr;
5730 _local_interfaces = nullptr;
5731
5732 // deallocate the klass if already created. Don't directly deallocate, but add
5733 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5734 // at a safepoint.
5735 if (_klass_to_deallocate != nullptr) {
5736 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5737 }
5738 }
5739
5740 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5741 TRAPS) {
5742
5743 assert(stream != nullptr, "invariant");
5744 assert(_class_name != nullptr, "invariant");
5745
5746 // BEGIN STREAM PARSING
5747 stream->guarantee_more(8, CHECK); // magic, major, minor
5748 // Magic value
5749 const u4 magic = stream->get_u4_fast();
5750 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5751 "Incompatible magic value %u in class file %s",
5752 magic, CHECK);
5753
5754 // Version numbers
5755 _minor_version = stream->get_u2_fast();
5756 _major_version = stream->get_u2_fast();
5757
5758 // Check version numbers - we check this even with verifier off
5759 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5760
5761 stream->guarantee_more(3, CHECK); // length, first cp tag
5762 u2 cp_size = stream->get_u2_fast();
5763
5764 guarantee_property(
5765 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5766 cp_size, CHECK);
5767
5768 _orig_cp_size = cp_size;
5769 if (is_hidden()) { // Add a slot for hidden class name.
5770 cp_size++;
5771 }
5772
5773 _cp = ConstantPool::allocate(_loader_data,
5774 cp_size,
5775 CHECK);
5776
5777 ConstantPool* const cp = _cp;
5778
5779 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5780
5781 assert(cp_size == (u2)cp->length(), "invariant");
5782
5783 // ACCESS FLAGS
5784 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5785
5786 u2 recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
5787 // JVM_ACC_MODULE is defined in JDK-9 and later.
5788 if (_major_version >= JAVA_9_VERSION) {
5789 recognized_modifiers |= JVM_ACC_MODULE;
5790 }
5791
5792 // Access flags
5793 u2 flags = stream->get_u2_fast() & recognized_modifiers;
5794
5795 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5796 // Set abstract bit for old class files for backward compatibility
5797 flags |= JVM_ACC_ABSTRACT;
5798 }
5799
5800 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5801 if (!supports_inline_types()) {
5802 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5803 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5804 if (!is_module && !is_interface) {
5805 flags |= JVM_ACC_IDENTITY;
5806 }
5807 }
5808
5809
5810 // This class and superclass
5811 _this_class_index = stream->get_u2_fast();
5812 guarantee_property(
5813 valid_cp_range(_this_class_index, cp_size) &&
5814 cp->tag_at(_this_class_index).is_unresolved_klass(),
5815 "Invalid this class index %u in constant pool in class file %s",
5816 _this_class_index, CHECK);
5817
5818 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5819 assert(class_name_in_cp != nullptr, "class_name can't be null");
5820
5821 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
5822
5823 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
5824
5825 _access_flags.set_flags(flags);
5826
5827 short bad_constant = class_bad_constant_seen();
5828 if (bad_constant != 0) {
5829 // Do not throw CFE until after the access_flags are checked because if
5830 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5831 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5832 return;
5833 }
5834
5835 // Don't need to check whether this class name is legal or not.
5836 // It has been checked when constant pool is parsed.
5837 // However, make sure it is not an array type.
5838 if (_need_verify) {
5839 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5840 "Bad class name in class file %s",
5841 CHECK);
5842 }
5843
5844 #ifdef ASSERT
5845 // Basic sanity checks
5846 if (_is_hidden) {
5847 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5848 }
5849 #endif
5850
5851 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5852
5853 if (_is_hidden) {
5854 assert(_class_name != nullptr, "Unexpected null _class_name");
5855 #ifdef ASSERT
5856 if (_need_verify) {
5857 verify_legal_class_name(_class_name, CHECK);
5858 }
5859 #endif
5860
5861 } else {
5862 // Check if name in class file matches given name
5863 if (_class_name != class_name_in_cp) {
5864 if (_class_name != vmSymbols::unknown_class_name()) {
5865 ResourceMark rm(THREAD);
5866 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5867 Exceptions::fthrow(THREAD_AND_LOCATION,
5868 vmSymbols::java_lang_NoClassDefFoundError(),
5869 "%s (wrong name: %s)",
5870 _class_name->as_C_string(),
5871 class_name_in_cp->as_C_string()
5872 );
5873 return;
5874 } else {
5875 // The class name was not known by the caller so we set it from
5876 // the value in the CP.
5877 update_class_name(class_name_in_cp);
5878 }
5879 // else nothing to do: the expected class name matches what is in the CP
5880 }
5881 }
5882
5883 // Verification prevents us from creating names with dots in them, this
5884 // asserts that that's the case.
5885 assert(is_internal_format(_class_name), "external class name format used internally");
5886
5887 if (!is_internal()) {
5888 LogTarget(Debug, class, preorder) lt;
5889 if (lt.is_enabled()){
5890 ResourceMark rm(THREAD);
5891 LogStream ls(lt);
5892 ls.print("%s", _class_name->as_klass_external_name());
5893 if (stream->source() != nullptr) {
5894 ls.print(" source: %s", stream->source());
5895 }
5896 ls.cr();
5897 }
5898 }
5899
5900 // SUPERKLASS
5901 _super_class_index = stream->get_u2_fast();
5902 _super_klass = parse_super_class(cp,
5903 _super_class_index,
5904 _need_verify,
5905 CHECK);
5906
5907 // Interfaces
5908 _itfs_len = stream->get_u2_fast();
5909 parse_interfaces(stream,
5910 _itfs_len,
5911 cp,
5912 &_has_nonstatic_concrete_methods,
5913 CHECK);
5914
5915 // Fields (offsets are filled in later)
5916 parse_fields(stream,
5917 _access_flags,
5918 cp,
5919 cp_size,
5920 &_java_fields_count,
5921 CHECK);
5922
5923 assert(_temp_field_info != nullptr, "invariant");
5924
5925 // Methods
5926 parse_methods(stream,
5927 is_interface(),
5928 !is_identity_class(),
5929 is_abstract_class(),
5930 &_has_localvariable_table,
5931 &_has_final_method,
5932 &_declares_nonstatic_concrete_methods,
5933 CHECK);
5934
5935 assert(_methods != nullptr, "invariant");
5936
5937 if (_declares_nonstatic_concrete_methods) {
5938 _has_nonstatic_concrete_methods = true;
5939 }
5940
5941 // Additional attributes/annotations
5942 _parsed_annotations = new ClassAnnotationCollector();
5943 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5944
5945 assert(_inner_classes != nullptr, "invariant");
5946
5947 // Finalize the Annotations metadata object,
5948 // now that all annotation arrays have been created.
5949 create_combined_annotations(CHECK);
5950
5951 // Make sure this is the end of class file stream
5952 guarantee_property(stream->at_eos(),
5953 "Extra bytes at the end of class file %s",
5954 CHECK);
5955
5956 // all bytes in stream read and parsed
5957 }
5958
5959 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5960 ResourceMark rm;
5961 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5962 // use a '/' because that confuses finding the class's package. Also, can't
5963 // use an illegal char such as ';' because that causes serialization issues
5964 // and issues with hidden classes that create their own hidden classes.
5965 char addr_buf[20];
5966 if (CDSConfig::is_dumping_static_archive()) {
5967 // We want stable names for the archived hidden classes (only for static
5968 // archive for now). Spaces under default_SharedBaseAddress() will be
5969 // occupied by the archive at run time, so we know that no dynamically
5970 // loaded InstanceKlass will be placed under there.
5971 static volatile size_t counter = 0;
5972 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5973 size_t new_id = Atomic::add(&counter, (size_t)1);
5974 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
5975 } else {
5976 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5977 }
5978 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5979 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5980 jio_snprintf(new_name, new_name_len, "%s+%s",
5981 _class_name->as_C_string(), addr_buf);
5982 update_class_name(SymbolTable::new_symbol(new_name));
5983
5984 // Add a Utf8 entry containing the hidden name.
5985 assert(_class_name != nullptr, "Unexpected null _class_name");
5986 int hidden_index = _orig_cp_size; // this is an extra slot we added
5987 _cp->symbol_at_put(hidden_index, _class_name);
5988
5989 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5990 // We have to update the resolved_klass_index and the name_index together
5991 // so extract the existing resolved_klass_index first.
5992 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5993 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5994 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5995 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5996 "Bad name_index");
5997 }
5998
5999 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6000 ConstantPool* cp,
6001 TRAPS) {
6002 assert(stream != nullptr, "invariant");
6003 assert(stream->at_eos(), "invariant");
6004 assert(cp != nullptr, "invariant");
6005 assert(_loader_data != nullptr, "invariant");
6006
6007 if (_class_name == vmSymbols::java_lang_Object()) {
6008 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6009 "java.lang.Object cannot implement an interface in class file %s",
6010 CHECK);
6011 }
6012 // We check super class after class file is parsed and format is checked
6013 if (_super_class_index > 0 && nullptr == _super_klass) {
6014 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6015 if (is_interface()) {
6016 // Before attempting to resolve the superclass, check for class format
6017 // errors not checked yet.
6018 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6019 "Interfaces must have java.lang.Object as superclass in class file %s",
6020 CHECK);
6021 }
6022 Handle loader(THREAD, _loader_data->class_loader());
6023 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6024 _super_klass = vmClasses::Object_klass();
6025 } else {
6026 _super_klass = (const InstanceKlass*)
6027 SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6028 super_class_name,
6029 loader,
6030 true,
6031 CHECK);
6032 }
6033 }
6034
6035 if (_super_klass != nullptr) {
6036 if (_super_klass->is_interface()) {
6037 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6038 return;
6039 }
6040
6041 if (_super_klass->is_final()) {
6042 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6043 return;
6044 }
6045
6046 if (EnableValhalla) {
6047 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6048 }
6049
6050 if (_super_klass->has_nonstatic_concrete_methods()) {
6051 _has_nonstatic_concrete_methods = true;
6052 }
6053 }
6054
6055 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6056 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6057 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6058 _class_name->as_klass_external_name()));
6059 }
6060
6061 // Determining is the class allows tearing or not (default is not)
6062 if (EnableValhalla && !_access_flags.is_identity_class()) {
6063 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6064 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6065 // Conditions above are not sufficient to determine atomicity requirements,
6066 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6067 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6068 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6069 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6070 _must_be_atomic = false;
6071 }
6072 // Apply VM options override
6073 if (*ForceNonTearable != '\0') {
6074 // Allow a command line switch to force the same atomicity property:
6075 const char* class_name_str = _class_name->as_C_string();
6076 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6077 _must_be_atomic = true;
6078 }
6079 }
6080 }
6081
6082 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6083 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6084 if (_local_interface_indexes != nullptr) {
6085 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6086 u2 interface_index = _local_interface_indexes->at(i);
6087 Klass* interf;
6088 if (cp->tag_at(interface_index).is_klass()) {
6089 interf = cp->resolved_klass_at(interface_index);
6090 } else {
6091 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6092
6093 // Don't need to check legal name because it's checked when parsing constant pool.
6094 // But need to make sure it's not an array type.
6095 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6096 "Bad interface name in class file %s", CHECK);
6097
6098 // Call resolve on the interface class name with class circularity checking
6099 interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6100 _class_name,
6101 unresolved_klass,
6102 Handle(THREAD, _loader_data->class_loader()),
6103 false,
6104 CHECK);
6105 }
6106
6107 if (!interf->is_interface()) {
6108 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6109 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6110 _class_name->as_klass_external_name(),
6111 interf->external_name(),
6112 interf->class_in_module_of_loader()));
6113 }
6114
6115 if (EnableValhalla) {
6116 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6117 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6118 }
6119
6120 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6121 _has_nonstatic_concrete_methods = true;
6122 }
6123 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6124 }
6125 }
6126 assert(_local_interfaces != nullptr, "invariant");
6127
6128 // Compute the transitive list of all unique interfaces implemented by this class
6129 _transitive_interfaces =
6130 compute_transitive_interfaces(_super_klass,
6131 _local_interfaces,
6132 _loader_data,
6133 CHECK);
6134
6135 assert(_transitive_interfaces != nullptr, "invariant");
6136
6137 // sort methods
6138 _method_ordering = sort_methods(_methods);
6139
6140 _all_mirandas = new GrowableArray<Method*>(20);
6141
6142 Handle loader(THREAD, _loader_data->class_loader());
6143 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6144 &_num_miranda_methods,
6145 _all_mirandas,
6146 _super_klass,
6147 _methods,
6148 _access_flags,
6149 _major_version,
6150 loader,
6151 _class_name,
6152 _local_interfaces);
6153
6154 // Size of Java itable (in words)
6155 _itable_size = is_interface() ? 0 :
6156 klassItable::compute_itable_size(_transitive_interfaces);
6157
6158 assert(_parsed_annotations != nullptr, "invariant");
6159
6160 if (EnableValhalla) {
6161 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6162 java_fields_count(),
6163 CHECK);
6164 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6165 FieldInfo fieldinfo = *it;
6166 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6167 Symbol* sig = fieldinfo.signature(cp);
6168 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6169 // Pre-load classes of null-free fields that are candidate for flattening
6170 TempNewSymbol s = Signature::strip_envelope(sig);
6171 if (s == _class_name) {
6172 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6173 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6174 }
6175 log_info(class, preload)("Preloading class %s during loading of class %s. "
6176 "Cause: a null-free non-static field is declared with this type",
6177 s->as_C_string(), _class_name->as_C_string());
6178 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s,
6179 Handle(THREAD,
6180 _loader_data->class_loader()),
6181 false, THREAD);
6182 if (HAS_PENDING_EXCEPTION) {
6183 log_warning(class, preload)("Preloading of class %s during loading of class %s "
6184 "(cause: null-free non-static field) failed: %s",
6185 s->as_C_string(), _class_name->as_C_string(),
6186 PENDING_EXCEPTION->klass()->name()->as_C_string());
6187 return; // Exception is still pending
6188 }
6189 assert(klass != nullptr, "Sanity check");
6190 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6191 InlineKlass* vk = InlineKlass::cast(klass);
6192 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6193 log_info(class, preload)("Preloading of class %s during loading of class %s "
6194 "(cause: null-free non-static field) succeeded",
6195 s->as_C_string(), _class_name->as_C_string());
6196 } else if (Signature::has_envelope(sig)) {
6197 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6198 // Those classes would be required later for the flattening of nullable inline type fields
6199 TempNewSymbol name = Signature::strip_envelope(sig);
6200 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6201 log_info(class, preload)("Preloading class %s during loading of class %s. "
6202 "Cause: field type in LoadableDescriptors attribute",
6203 name->as_C_string(), _class_name->as_C_string());
6204 oop loader = loader_data()->class_loader();
6205 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name,
6206 Handle(THREAD, loader),
6207 false, THREAD);
6208 if (klass != nullptr) {
6209 if (klass->is_inline_klass()) {
6210 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6211 log_info(class, preload)("Preloading of class %s during loading of class %s "
6212 "(cause: field type in LoadableDescriptors attribute) succeeded",
6213 name->as_C_string(), _class_name->as_C_string());
6214 } else {
6215 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6216 log_warning(class, preload)("Preloading class %s during loading of class %s "
6217 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6218 name->as_C_string(), _class_name->as_C_string());
6219 }
6220 } else {
6221 log_warning(class, preload)("Preloading of class %s during loading of class %s "
6222 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6223 name->as_C_string(), _class_name->as_C_string(),
6224 PENDING_EXCEPTION->klass()->name()->as_C_string());
6225 }
6226 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6227 if (HAS_PENDING_EXCEPTION) {
6228 CLEAR_PENDING_EXCEPTION;
6229 }
6230 } else {
6231 // Just poking the system dictionary to see if the class has already be loaded
6232 oop loader = loader_data()->class_loader();
6233 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6234 if (klass != nullptr && klass->is_inline_klass()) {
6235 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6236 }
6237 }
6238 }
6239 }
6240 }
6241
6242 _layout_info = new FieldLayoutInfo();
6243 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6244 _parsed_annotations->is_contended(), is_inline_type(),
6245 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6246 _must_be_atomic, _layout_info, _inline_layout_info_array);
6247 lb.build_layout();
6248 _has_inline_type_fields = _layout_info->_has_inline_fields;
6249
6250 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6251 _fieldinfo_stream =
6252 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6253 injected_fields_count, loader_data(), CHECK);
6254
6255 _fields_status =
6256 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6257 FieldStatus(0), CHECK);
6258
6259 // Strict static fields track initialization status from the beginning of time.
6260 // After this class runs <clinit>, they will be verified as being "not unset".
6261 // See Step 8 of InstanceKlass::initialize_impl.
6262 if (_has_strict_static_fields) {
6263 bool found_one = false;
6264 for (int i = 0; i < _temp_field_info->length(); i++) {
6265 FieldInfo& fi = *_temp_field_info->adr_at(i);
6266 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6267 found_one = true;
6268 if (fi.initializer_index() != 0) {
6269 // skip strict static fields with ConstantValue attributes
6270 } else {
6271 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6272 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6273 }
6274 }
6275 }
6276 assert(found_one == _has_strict_static_fields,
6277 "correct prediction = %d", (int)_has_strict_static_fields);
6278 }
6279 }
6280
6281 void ClassFileParser::set_klass(InstanceKlass* klass) {
6282
6283 #ifdef ASSERT
6284 if (klass != nullptr) {
6285 assert(nullptr == _klass, "leaking?");
6286 }
6287 #endif
6288
6289 _klass = klass;
6290 }
6291
6292 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6293
6294 #ifdef ASSERT
6295 if (klass != nullptr) {
6296 assert(nullptr == _klass_to_deallocate, "leaking?");
6297 }
6298 #endif
6299
6300 _klass_to_deallocate = klass;
6301 }
6302
6303 // Caller responsible for ResourceMark
6304 // clone stream with rewound position
6305 const ClassFileStream* ClassFileParser::clone_stream() const {
6306 assert(_stream != nullptr, "invariant");
6307
6308 return _stream->clone();
6309 }
6310
6311 ReferenceType ClassFileParser::super_reference_type() const {
6312 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6313 }
6314
6315 bool ClassFileParser::is_instance_ref_klass() const {
6316 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6317 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6318 // klass requiring special treatment in ref-processing. The abstract
6319 // j.l.r.Reference cannot be instantiated so doesn't partake in
6320 // ref-processing.
6321 return is_java_lang_ref_Reference_subclass();
6322 }
6323
6324 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6325 if (_super_klass == nullptr) {
6326 return false;
6327 }
6328
6329 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6330 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6331 return true;
6332 }
6333
6334 return _super_klass->reference_type() != REF_NONE;
6335 }
6336
6337 // Returns true if the future Klass will need to be addressable with a narrow Klass ID.
6338 bool ClassFileParser::klass_needs_narrow_id() const {
6339 // Classes that are never instantiated need no narrow Klass Id, since the
6340 // only point of having a narrow id is to put it into an object header. Keeping
6341 // never instantiated classes out of class space lessens the class space pressure.
6342 // For more details, see JDK-8338526.
6343 return !is_interface() && !is_abstract();
6344 }
6345
6346 // ----------------------------------------------------------------------------
6347 // debugging
6348
6349 #ifdef ASSERT
6350
6351 // return true if class_name contains no '.' (internal format is '/')
6352 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6353 if (class_name != nullptr) {
6354 ResourceMark rm;
6355 char* name = class_name->as_C_string();
6356 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6357 } else {
6358 return true;
6359 }
6360 }
6361
6362 #endif